blob: e13a73298b4ccffc385dd1cb730001c5482cc1fd [file] [log] [blame]
William Juul0e8cc8b2007-11-15 11:13:05 +01001/*
2 * YAFFS: Yet Another Flash File System. A NAND-flash specific file system.
3 *
Charles Manning753ac612012-05-09 16:55:17 +00004 * Copyright (C) 2002-2011 Aleph One Ltd.
William Juul0e8cc8b2007-11-15 11:13:05 +01005 * for Toby Churchill Ltd and Brightstar Engineering
6 *
7 * Created by Charles Manning <charles@aleph1.co.uk>
8 *
9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License version 2 as
11 * published by the Free Software Foundation.
12 */
13
William Juul0e8cc8b2007-11-15 11:13:05 +010014#include "yportenv.h"
Charles Manning753ac612012-05-09 16:55:17 +000015#include "yaffs_trace.h"
Simon Glass61b29b82020-02-03 07:36:15 -070016#include <dm/devres.h>
William Juul0e8cc8b2007-11-15 11:13:05 +010017
William Juul0e8cc8b2007-11-15 11:13:05 +010018#include "yaffs_guts.h"
Charles Manning753ac612012-05-09 16:55:17 +000019#include "yaffs_getblockinfo.h"
William Juul0e8cc8b2007-11-15 11:13:05 +010020#include "yaffs_tagscompat.h"
William Juul0e8cc8b2007-11-15 11:13:05 +010021#include "yaffs_nand.h"
Charles Manning753ac612012-05-09 16:55:17 +000022#include "yaffs_yaffs1.h"
23#include "yaffs_yaffs2.h"
24#include "yaffs_bitmap.h"
25#include "yaffs_verify.h"
William Juul0e8cc8b2007-11-15 11:13:05 +010026#include "yaffs_nand.h"
27#include "yaffs_packedtags2.h"
Charles Manning753ac612012-05-09 16:55:17 +000028#include "yaffs_nameval.h"
29#include "yaffs_allocator.h"
30#include "yaffs_attribs.h"
31#include "yaffs_summary.h"
William Juul0e8cc8b2007-11-15 11:13:05 +010032
Charles Manning753ac612012-05-09 16:55:17 +000033/* Note YAFFS_GC_GOOD_ENOUGH must be <= YAFFS_GC_PASSIVE_THRESHOLD */
34#define YAFFS_GC_GOOD_ENOUGH 2
35#define YAFFS_GC_PASSIVE_THRESHOLD 4
William Juul0e8cc8b2007-11-15 11:13:05 +010036
37#include "yaffs_ecc.h"
38
Charles Manning753ac612012-05-09 16:55:17 +000039/* Forward declarations */
William Juul0e8cc8b2007-11-15 11:13:05 +010040
Charles Manning753ac612012-05-09 16:55:17 +000041static int yaffs_wr_data_obj(struct yaffs_obj *in, int inode_chunk,
42 const u8 *buffer, int n_bytes, int use_reserve);
William Juul0e8cc8b2007-11-15 11:13:05 +010043
William Juul0e8cc8b2007-11-15 11:13:05 +010044
45
46/* Function to calculate chunk and offset */
47
Charles Manning753ac612012-05-09 16:55:17 +000048void yaffs_addr_to_chunk(struct yaffs_dev *dev, loff_t addr,
49 int *chunk_out, u32 *offset_out)
William Juul0e8cc8b2007-11-15 11:13:05 +010050{
Charles Manning753ac612012-05-09 16:55:17 +000051 int chunk;
52 u32 offset;
53
54 chunk = (u32) (addr >> dev->chunk_shift);
55
56 if (dev->chunk_div == 1) {
57 /* easy power of 2 case */
58 offset = (u32) (addr & dev->chunk_mask);
59 } else {
60 /* Non power-of-2 case */
61
62 loff_t chunk_base;
63
64 chunk /= dev->chunk_div;
65
66 chunk_base = ((loff_t) chunk) * dev->data_bytes_per_chunk;
67 offset = (u32) (addr - chunk_base);
William Juul0e8cc8b2007-11-15 11:13:05 +010068 }
Charles Manning753ac612012-05-09 16:55:17 +000069
70 *chunk_out = chunk;
71 *offset_out = offset;
William Juul0e8cc8b2007-11-15 11:13:05 +010072}
73
Charles Manning753ac612012-05-09 16:55:17 +000074/* Function to return the number of shifts for a power of 2 greater than or
75 * equal to the given number
William Juul0e8cc8b2007-11-15 11:13:05 +010076 * Note we don't try to cater for all possible numbers and this does not have to
77 * be hellishly efficient.
78 */
Wolfgang Denk4b070802008-08-14 14:41:06 +020079
Charles Manning753ac612012-05-09 16:55:17 +000080static inline u32 calc_shifts_ceiling(u32 x)
William Juul0e8cc8b2007-11-15 11:13:05 +010081{
Charles Manning753ac612012-05-09 16:55:17 +000082 int extra_bits;
83 int shifts;
Wolfgang Denk4b070802008-08-14 14:41:06 +020084
Charles Manning753ac612012-05-09 16:55:17 +000085 shifts = extra_bits = 0;
Wolfgang Denk4b070802008-08-14 14:41:06 +020086
Charles Manning753ac612012-05-09 16:55:17 +000087 while (x > 1) {
88 if (x & 1)
89 extra_bits++;
90 x >>= 1;
91 shifts++;
William Juul0e8cc8b2007-11-15 11:13:05 +010092 }
93
Charles Manning753ac612012-05-09 16:55:17 +000094 if (extra_bits)
95 shifts++;
Wolfgang Denk4b070802008-08-14 14:41:06 +020096
Charles Manning753ac612012-05-09 16:55:17 +000097 return shifts;
William Juul0e8cc8b2007-11-15 11:13:05 +010098}
99
100/* Function to return the number of shifts to get a 1 in bit 0
101 */
Wolfgang Denk4b070802008-08-14 14:41:06 +0200102
Charles Manning753ac612012-05-09 16:55:17 +0000103static inline u32 calc_shifts(u32 x)
William Juul0e8cc8b2007-11-15 11:13:05 +0100104{
Charles Manning753ac612012-05-09 16:55:17 +0000105 u32 shifts;
Wolfgang Denk4b070802008-08-14 14:41:06 +0200106
Charles Manning753ac612012-05-09 16:55:17 +0000107 shifts = 0;
Wolfgang Denk4b070802008-08-14 14:41:06 +0200108
Charles Manning753ac612012-05-09 16:55:17 +0000109 if (!x)
110 return 0;
Wolfgang Denk4b070802008-08-14 14:41:06 +0200111
Charles Manning753ac612012-05-09 16:55:17 +0000112 while (!(x & 1)) {
113 x >>= 1;
114 shifts++;
William Juul0e8cc8b2007-11-15 11:13:05 +0100115 }
Wolfgang Denk4b070802008-08-14 14:41:06 +0200116
Charles Manning753ac612012-05-09 16:55:17 +0000117 return shifts;
William Juul0e8cc8b2007-11-15 11:13:05 +0100118}
119
Wolfgang Denk4b070802008-08-14 14:41:06 +0200120/*
William Juul0e8cc8b2007-11-15 11:13:05 +0100121 * Temporary buffer manipulations.
122 */
123
Charles Manning753ac612012-05-09 16:55:17 +0000124static int yaffs_init_tmp_buffers(struct yaffs_dev *dev)
William Juul0e8cc8b2007-11-15 11:13:05 +0100125{
126 int i;
Charles Manning753ac612012-05-09 16:55:17 +0000127 u8 *buf = (u8 *) 1;
Wolfgang Denk4b070802008-08-14 14:41:06 +0200128
Charles Manning753ac612012-05-09 16:55:17 +0000129 memset(dev->temp_buffer, 0, sizeof(dev->temp_buffer));
Wolfgang Denk4b070802008-08-14 14:41:06 +0200130
William Juul0e8cc8b2007-11-15 11:13:05 +0100131 for (i = 0; buf && i < YAFFS_N_TEMP_BUFFERS; i++) {
Charles Manning753ac612012-05-09 16:55:17 +0000132 dev->temp_buffer[i].in_use = 0;
133 buf = kmalloc(dev->param.total_bytes_per_chunk, GFP_NOFS);
134 dev->temp_buffer[i].buffer = buf;
William Juul0e8cc8b2007-11-15 11:13:05 +0100135 }
Wolfgang Denk4b070802008-08-14 14:41:06 +0200136
William Juul0e8cc8b2007-11-15 11:13:05 +0100137 return buf ? YAFFS_OK : YAFFS_FAIL;
William Juul0e8cc8b2007-11-15 11:13:05 +0100138}
139
Charles Manning753ac612012-05-09 16:55:17 +0000140u8 *yaffs_get_temp_buffer(struct yaffs_dev * dev)
William Juul0e8cc8b2007-11-15 11:13:05 +0100141{
Charles Manning753ac612012-05-09 16:55:17 +0000142 int i;
William Juul0e8cc8b2007-11-15 11:13:05 +0100143
Charles Manning753ac612012-05-09 16:55:17 +0000144 dev->temp_in_use++;
145 if (dev->temp_in_use > dev->max_temp)
146 dev->max_temp = dev->temp_in_use;
147
148 for (i = 0; i < YAFFS_N_TEMP_BUFFERS; i++) {
149 if (dev->temp_buffer[i].in_use == 0) {
150 dev->temp_buffer[i].in_use = 1;
151 return dev->temp_buffer[i].buffer;
William Juul0e8cc8b2007-11-15 11:13:05 +0100152 }
153 }
154
Charles Manning753ac612012-05-09 16:55:17 +0000155 yaffs_trace(YAFFS_TRACE_BUFFERS, "Out of temp buffers");
William Juul0e8cc8b2007-11-15 11:13:05 +0100156 /*
157 * If we got here then we have to allocate an unmanaged one
158 * This is not good.
159 */
160
Charles Manning753ac612012-05-09 16:55:17 +0000161 dev->unmanaged_buffer_allocs++;
162 return kmalloc(dev->data_bytes_per_chunk, GFP_NOFS);
William Juul0e8cc8b2007-11-15 11:13:05 +0100163
164}
165
Charles Manning753ac612012-05-09 16:55:17 +0000166void yaffs_release_temp_buffer(struct yaffs_dev *dev, u8 *buffer)
William Juul0e8cc8b2007-11-15 11:13:05 +0100167{
168 int i;
Charles Manning753ac612012-05-09 16:55:17 +0000169
170 dev->temp_in_use--;
171
William Juul0e8cc8b2007-11-15 11:13:05 +0100172 for (i = 0; i < YAFFS_N_TEMP_BUFFERS; i++) {
Charles Manning753ac612012-05-09 16:55:17 +0000173 if (dev->temp_buffer[i].buffer == buffer) {
174 dev->temp_buffer[i].in_use = 0;
William Juul0e8cc8b2007-11-15 11:13:05 +0100175 return;
176 }
177 }
178
179 if (buffer) {
180 /* assume it is an unmanaged one. */
Charles Manning753ac612012-05-09 16:55:17 +0000181 yaffs_trace(YAFFS_TRACE_BUFFERS,
182 "Releasing unmanaged temp buffer");
183 kfree(buffer);
184 dev->unmanaged_buffer_deallocs++;
William Juul0e8cc8b2007-11-15 11:13:05 +0100185 }
186
187}
188
189/*
190 * Determine if we have a managed buffer.
191 */
Charles Manning753ac612012-05-09 16:55:17 +0000192int yaffs_is_managed_tmp_buffer(struct yaffs_dev *dev, const u8 *buffer)
William Juul0e8cc8b2007-11-15 11:13:05 +0100193{
194 int i;
Charles Manning753ac612012-05-09 16:55:17 +0000195
William Juul0e8cc8b2007-11-15 11:13:05 +0100196 for (i = 0; i < YAFFS_N_TEMP_BUFFERS; i++) {
Charles Manning753ac612012-05-09 16:55:17 +0000197 if (dev->temp_buffer[i].buffer == buffer)
William Juul0e8cc8b2007-11-15 11:13:05 +0100198 return 1;
William Juul0e8cc8b2007-11-15 11:13:05 +0100199 }
200
Charles Manning753ac612012-05-09 16:55:17 +0000201 for (i = 0; i < dev->param.n_caches; i++) {
202 if (dev->cache[i].data == buffer)
William Juul0e8cc8b2007-11-15 11:13:05 +0100203 return 1;
William Juul0e8cc8b2007-11-15 11:13:05 +0100204 }
Charles Manning753ac612012-05-09 16:55:17 +0000205
206 if (buffer == dev->checkpt_buffer)
207 return 1;
208
209 yaffs_trace(YAFFS_TRACE_ALWAYS,
210 "yaffs: unmaged buffer detected.");
William Juul0e8cc8b2007-11-15 11:13:05 +0100211 return 0;
212}
213
Charles Manning753ac612012-05-09 16:55:17 +0000214/*
215 * Functions for robustisizing TODO
216 *
217 */
Wolfgang Denk4b070802008-08-14 14:41:06 +0200218
Charles Manning753ac612012-05-09 16:55:17 +0000219static void yaffs_handle_chunk_wr_ok(struct yaffs_dev *dev, int nand_chunk,
220 const u8 *data,
221 const struct yaffs_ext_tags *tags)
222{
Charles Manning753ac612012-05-09 16:55:17 +0000223}
224
225static void yaffs_handle_chunk_update(struct yaffs_dev *dev, int nand_chunk,
226 const struct yaffs_ext_tags *tags)
227{
Charles Manning753ac612012-05-09 16:55:17 +0000228}
229
230void yaffs_handle_chunk_error(struct yaffs_dev *dev,
231 struct yaffs_block_info *bi)
232{
233 if (!bi->gc_prioritise) {
234 bi->gc_prioritise = 1;
235 dev->has_pending_prioritised_gc = 1;
236 bi->chunk_error_strikes++;
237
238 if (bi->chunk_error_strikes > 3) {
239 bi->needs_retiring = 1; /* Too many stikes, so retire */
240 yaffs_trace(YAFFS_TRACE_ALWAYS,
241 "yaffs: Block struck out");
242
243 }
William Juul0e8cc8b2007-11-15 11:13:05 +0100244 }
Charles Manning753ac612012-05-09 16:55:17 +0000245}
246
247static void yaffs_handle_chunk_wr_error(struct yaffs_dev *dev, int nand_chunk,
248 int erased_ok)
249{
250 int flash_block = nand_chunk / dev->param.chunks_per_block;
251 struct yaffs_block_info *bi = yaffs_get_block_info(dev, flash_block);
252
253 yaffs_handle_chunk_error(dev, bi);
254
255 if (erased_ok) {
256 /* Was an actual write failure,
257 * so mark the block for retirement.*/
258 bi->needs_retiring = 1;
259 yaffs_trace(YAFFS_TRACE_ERROR | YAFFS_TRACE_BAD_BLOCKS,
260 "**>> Block %d needs retiring", flash_block);
261 }
262
263 /* Delete the chunk */
264 yaffs_chunk_del(dev, nand_chunk, 1, __LINE__);
265 yaffs_skip_rest_of_block(dev);
William Juul0e8cc8b2007-11-15 11:13:05 +0100266}
267
Wolfgang Denk4b070802008-08-14 14:41:06 +0200268/*
William Juul0e8cc8b2007-11-15 11:13:05 +0100269 * Verification code
270 */
Wolfgang Denk4b070802008-08-14 14:41:06 +0200271
William Juul0e8cc8b2007-11-15 11:13:05 +0100272/*
273 * Simple hash function. Needs to have a reasonable spread
274 */
Wolfgang Denk4b070802008-08-14 14:41:06 +0200275
Charles Manning753ac612012-05-09 16:55:17 +0000276static inline int yaffs_hash_fn(int n)
William Juul0e8cc8b2007-11-15 11:13:05 +0100277{
William Juul90ef1172007-11-15 12:23:57 +0100278 if (n < 0)
279 n = -n;
Charles Manning753ac612012-05-09 16:55:17 +0000280 return n % YAFFS_NOBJECT_BUCKETS;
William Juul0e8cc8b2007-11-15 11:13:05 +0100281}
282
283/*
Charles Manning753ac612012-05-09 16:55:17 +0000284 * Access functions to useful fake objects.
285 * Note that root might have a presence in NAND if permissions are set.
William Juul0e8cc8b2007-11-15 11:13:05 +0100286 */
Wolfgang Denk4b070802008-08-14 14:41:06 +0200287
Charles Manning753ac612012-05-09 16:55:17 +0000288struct yaffs_obj *yaffs_root(struct yaffs_dev *dev)
William Juul0e8cc8b2007-11-15 11:13:05 +0100289{
Charles Manning753ac612012-05-09 16:55:17 +0000290 return dev->root_dir;
William Juul0e8cc8b2007-11-15 11:13:05 +0100291}
292
Charles Manning753ac612012-05-09 16:55:17 +0000293struct yaffs_obj *yaffs_lost_n_found(struct yaffs_dev *dev)
William Juul0e8cc8b2007-11-15 11:13:05 +0100294{
Charles Manning753ac612012-05-09 16:55:17 +0000295 return dev->lost_n_found;
William Juul0e8cc8b2007-11-15 11:13:05 +0100296}
297
William Juul0e8cc8b2007-11-15 11:13:05 +0100298/*
299 * Erased NAND checking functions
300 */
Wolfgang Denk4b070802008-08-14 14:41:06 +0200301
Charles Manning753ac612012-05-09 16:55:17 +0000302int yaffs_check_ff(u8 *buffer, int n_bytes)
William Juul0e8cc8b2007-11-15 11:13:05 +0100303{
304 /* Horrible, slow implementation */
Charles Manning753ac612012-05-09 16:55:17 +0000305 while (n_bytes--) {
306 if (*buffer != 0xff)
William Juul0e8cc8b2007-11-15 11:13:05 +0100307 return 0;
308 buffer++;
309 }
310 return 1;
311}
312
Charles Manning753ac612012-05-09 16:55:17 +0000313static int yaffs_check_chunk_erased(struct yaffs_dev *dev, int nand_chunk)
William Juul0e8cc8b2007-11-15 11:13:05 +0100314{
William Juul0e8cc8b2007-11-15 11:13:05 +0100315 int retval = YAFFS_OK;
Charles Manning753ac612012-05-09 16:55:17 +0000316 u8 *data = yaffs_get_temp_buffer(dev);
317 struct yaffs_ext_tags tags;
William Juul0e8cc8b2007-11-15 11:13:05 +0100318
Anatolij Gustschin8cc64ba2012-10-05 23:31:03 +0000319 yaffs_rd_chunk_tags_nand(dev, nand_chunk, data, &tags);
Wolfgang Denk4b070802008-08-14 14:41:06 +0200320
Charles Manning753ac612012-05-09 16:55:17 +0000321 if (tags.ecc_result > YAFFS_ECC_RESULT_NO_ERROR)
William Juul0e8cc8b2007-11-15 11:13:05 +0100322 retval = YAFFS_FAIL;
Wolfgang Denk4b070802008-08-14 14:41:06 +0200323
Charles Manning753ac612012-05-09 16:55:17 +0000324 if (!yaffs_check_ff(data, dev->data_bytes_per_chunk) ||
325 tags.chunk_used) {
326 yaffs_trace(YAFFS_TRACE_NANDACCESS,
327 "Chunk %d not erased", nand_chunk);
William Juul0e8cc8b2007-11-15 11:13:05 +0100328 retval = YAFFS_FAIL;
329 }
330
Charles Manning753ac612012-05-09 16:55:17 +0000331 yaffs_release_temp_buffer(dev, data);
William Juul0e8cc8b2007-11-15 11:13:05 +0100332
333 return retval;
334
335}
336
Charles Manning753ac612012-05-09 16:55:17 +0000337static int yaffs_verify_chunk_written(struct yaffs_dev *dev,
338 int nand_chunk,
339 const u8 *data,
340 struct yaffs_ext_tags *tags)
341{
342 int retval = YAFFS_OK;
343 struct yaffs_ext_tags temp_tags;
344 u8 *buffer = yaffs_get_temp_buffer(dev);
Charles Manning753ac612012-05-09 16:55:17 +0000345
Anatolij Gustschin8cc64ba2012-10-05 23:31:03 +0000346 yaffs_rd_chunk_tags_nand(dev, nand_chunk, buffer, &temp_tags);
Charles Manning753ac612012-05-09 16:55:17 +0000347 if (memcmp(buffer, data, dev->data_bytes_per_chunk) ||
348 temp_tags.obj_id != tags->obj_id ||
349 temp_tags.chunk_id != tags->chunk_id ||
350 temp_tags.n_bytes != tags->n_bytes)
351 retval = YAFFS_FAIL;
352
353 yaffs_release_temp_buffer(dev, buffer);
354
355 return retval;
356}
357
358
359int yaffs_check_alloc_available(struct yaffs_dev *dev, int n_chunks)
360{
361 int reserved_chunks;
362 int reserved_blocks = dev->param.n_reserved_blocks;
363 int checkpt_blocks;
364
365 checkpt_blocks = yaffs_calc_checkpt_blocks_required(dev);
366
367 reserved_chunks =
368 (reserved_blocks + checkpt_blocks) * dev->param.chunks_per_block;
369
370 return (dev->n_free_chunks > (reserved_chunks + n_chunks));
371}
372
373static int yaffs_find_alloc_block(struct yaffs_dev *dev)
374{
375 int i;
376 struct yaffs_block_info *bi;
377
378 if (dev->n_erased_blocks < 1) {
379 /* Hoosterman we've got a problem.
380 * Can't get space to gc
381 */
382 yaffs_trace(YAFFS_TRACE_ERROR,
383 "yaffs tragedy: no more erased blocks");
384
385 return -1;
386 }
387
388 /* Find an empty block. */
389
390 for (i = dev->internal_start_block; i <= dev->internal_end_block; i++) {
391 dev->alloc_block_finder++;
392 if (dev->alloc_block_finder < dev->internal_start_block
393 || dev->alloc_block_finder > dev->internal_end_block) {
394 dev->alloc_block_finder = dev->internal_start_block;
395 }
396
397 bi = yaffs_get_block_info(dev, dev->alloc_block_finder);
398
399 if (bi->block_state == YAFFS_BLOCK_STATE_EMPTY) {
400 bi->block_state = YAFFS_BLOCK_STATE_ALLOCATING;
401 dev->seq_number++;
402 bi->seq_number = dev->seq_number;
403 dev->n_erased_blocks--;
404 yaffs_trace(YAFFS_TRACE_ALLOCATE,
405 "Allocated block %d, seq %d, %d left" ,
406 dev->alloc_block_finder, dev->seq_number,
407 dev->n_erased_blocks);
408 return dev->alloc_block_finder;
409 }
410 }
411
412 yaffs_trace(YAFFS_TRACE_ALWAYS,
413 "yaffs tragedy: no more erased blocks, but there should have been %d",
414 dev->n_erased_blocks);
415
416 return -1;
417}
418
419static int yaffs_alloc_chunk(struct yaffs_dev *dev, int use_reserver,
420 struct yaffs_block_info **block_ptr)
421{
422 int ret_val;
423 struct yaffs_block_info *bi;
424
425 if (dev->alloc_block < 0) {
426 /* Get next block to allocate off */
427 dev->alloc_block = yaffs_find_alloc_block(dev);
428 dev->alloc_page = 0;
429 }
430
431 if (!use_reserver && !yaffs_check_alloc_available(dev, 1)) {
432 /* No space unless we're allowed to use the reserve. */
433 return -1;
434 }
435
436 if (dev->n_erased_blocks < dev->param.n_reserved_blocks
437 && dev->alloc_page == 0)
438 yaffs_trace(YAFFS_TRACE_ALLOCATE, "Allocating reserve");
439
440 /* Next page please.... */
441 if (dev->alloc_block >= 0) {
442 bi = yaffs_get_block_info(dev, dev->alloc_block);
443
444 ret_val = (dev->alloc_block * dev->param.chunks_per_block) +
445 dev->alloc_page;
446 bi->pages_in_use++;
447 yaffs_set_chunk_bit(dev, dev->alloc_block, dev->alloc_page);
448
449 dev->alloc_page++;
450
451 dev->n_free_chunks--;
452
453 /* If the block is full set the state to full */
454 if (dev->alloc_page >= dev->param.chunks_per_block) {
455 bi->block_state = YAFFS_BLOCK_STATE_FULL;
456 dev->alloc_block = -1;
457 }
458
459 if (block_ptr)
460 *block_ptr = bi;
461
462 return ret_val;
463 }
464
465 yaffs_trace(YAFFS_TRACE_ERROR,
466 "!!!!!!!!! Allocator out !!!!!!!!!!!!!!!!!");
467
468 return -1;
469}
470
471static int yaffs_get_erased_chunks(struct yaffs_dev *dev)
472{
473 int n;
474
475 n = dev->n_erased_blocks * dev->param.chunks_per_block;
476
477 if (dev->alloc_block > 0)
478 n += (dev->param.chunks_per_block - dev->alloc_page);
479
480 return n;
481
482}
483
484/*
485 * yaffs_skip_rest_of_block() skips over the rest of the allocation block
486 * if we don't want to write to it.
487 */
488void yaffs_skip_rest_of_block(struct yaffs_dev *dev)
489{
490 struct yaffs_block_info *bi;
491
492 if (dev->alloc_block > 0) {
493 bi = yaffs_get_block_info(dev, dev->alloc_block);
494 if (bi->block_state == YAFFS_BLOCK_STATE_ALLOCATING) {
495 bi->block_state = YAFFS_BLOCK_STATE_FULL;
496 dev->alloc_block = -1;
497 }
498 }
499}
500
501static int yaffs_write_new_chunk(struct yaffs_dev *dev,
502 const u8 *data,
503 struct yaffs_ext_tags *tags, int use_reserver)
William Juul0e8cc8b2007-11-15 11:13:05 +0100504{
505 int attempts = 0;
Charles Manning753ac612012-05-09 16:55:17 +0000506 int write_ok = 0;
William Juul0e8cc8b2007-11-15 11:13:05 +0100507 int chunk;
508
Charles Manning753ac612012-05-09 16:55:17 +0000509 yaffs2_checkpt_invalidate(dev);
William Juul0e8cc8b2007-11-15 11:13:05 +0100510
511 do {
Charles Manning753ac612012-05-09 16:55:17 +0000512 struct yaffs_block_info *bi = 0;
513 int erased_ok = 0;
William Juul0e8cc8b2007-11-15 11:13:05 +0100514
Charles Manning753ac612012-05-09 16:55:17 +0000515 chunk = yaffs_alloc_chunk(dev, use_reserver, &bi);
William Juul0e8cc8b2007-11-15 11:13:05 +0100516 if (chunk < 0) {
517 /* no space */
518 break;
519 }
520
521 /* First check this chunk is erased, if it needs
522 * checking. The checking policy (unless forced
523 * always on) is as follows:
524 *
525 * Check the first page we try to write in a block.
526 * If the check passes then we don't need to check any
Charles Manning753ac612012-05-09 16:55:17 +0000527 * more. If the check fails, we check again...
William Juul0e8cc8b2007-11-15 11:13:05 +0100528 * If the block has been erased, we don't need to check.
529 *
530 * However, if the block has been prioritised for gc,
531 * then we think there might be something odd about
532 * this block and stop using it.
533 *
534 * Rationale: We should only ever see chunks that have
535 * not been erased if there was a partially written
536 * chunk due to power loss. This checking policy should
537 * catch that case with very few checks and thus save a
538 * lot of checks that are most likely not needed.
Charles Manning753ac612012-05-09 16:55:17 +0000539 *
540 * Mods to the above
541 * If an erase check fails or the write fails we skip the
542 * rest of the block.
William Juul0e8cc8b2007-11-15 11:13:05 +0100543 */
William Juul0e8cc8b2007-11-15 11:13:05 +0100544
545 /* let's give it a try */
546 attempts++;
547
Charles Manning753ac612012-05-09 16:55:17 +0000548 if (dev->param.always_check_erased)
549 bi->skip_erased_check = 0;
William Juul0e8cc8b2007-11-15 11:13:05 +0100550
Charles Manning753ac612012-05-09 16:55:17 +0000551 if (!bi->skip_erased_check) {
552 erased_ok = yaffs_check_chunk_erased(dev, chunk);
553 if (erased_ok != YAFFS_OK) {
554 yaffs_trace(YAFFS_TRACE_ERROR,
555 "**>> yaffs chunk %d was not erased",
556 chunk);
557
558 /* If not erased, delete this one,
559 * skip rest of block and
560 * try another chunk */
561 yaffs_chunk_del(dev, chunk, 1, __LINE__);
562 yaffs_skip_rest_of_block(dev);
William Juul0e8cc8b2007-11-15 11:13:05 +0100563 continue;
564 }
William Juul0e8cc8b2007-11-15 11:13:05 +0100565 }
566
Charles Manning753ac612012-05-09 16:55:17 +0000567 write_ok = yaffs_wr_chunk_tags_nand(dev, chunk, data, tags);
568
569 if (!bi->skip_erased_check)
570 write_ok =
571 yaffs_verify_chunk_written(dev, chunk, data, tags);
572
573 if (write_ok != YAFFS_OK) {
574 /* Clean up aborted write, skip to next block and
575 * try another chunk */
576 yaffs_handle_chunk_wr_error(dev, chunk, erased_ok);
William Juul0e8cc8b2007-11-15 11:13:05 +0100577 continue;
578 }
579
Charles Manning753ac612012-05-09 16:55:17 +0000580 bi->skip_erased_check = 1;
581
William Juul0e8cc8b2007-11-15 11:13:05 +0100582 /* Copy the data into the robustification buffer */
Charles Manning753ac612012-05-09 16:55:17 +0000583 yaffs_handle_chunk_wr_ok(dev, chunk, data, tags);
William Juul0e8cc8b2007-11-15 11:13:05 +0100584
Charles Manning753ac612012-05-09 16:55:17 +0000585 } while (write_ok != YAFFS_OK &&
586 (yaffs_wr_attempts <= 0 || attempts <= yaffs_wr_attempts));
Wolfgang Denk4b070802008-08-14 14:41:06 +0200587
Charles Manning753ac612012-05-09 16:55:17 +0000588 if (!write_ok)
William Juul0e8cc8b2007-11-15 11:13:05 +0100589 chunk = -1;
590
591 if (attempts > 1) {
Charles Manning753ac612012-05-09 16:55:17 +0000592 yaffs_trace(YAFFS_TRACE_ERROR,
593 "**>> yaffs write required %d attempts",
594 attempts);
595 dev->n_retried_writes += (attempts - 1);
William Juul0e8cc8b2007-11-15 11:13:05 +0100596 }
597
598 return chunk;
599}
600
601/*
602 * Block retiring for handling a broken block.
603 */
Wolfgang Denk4b070802008-08-14 14:41:06 +0200604
Charles Manning753ac612012-05-09 16:55:17 +0000605static void yaffs_retire_block(struct yaffs_dev *dev, int flash_block)
William Juul0e8cc8b2007-11-15 11:13:05 +0100606{
Charles Manning753ac612012-05-09 16:55:17 +0000607 struct yaffs_block_info *bi = yaffs_get_block_info(dev, flash_block);
William Juul0e8cc8b2007-11-15 11:13:05 +0100608
Charles Manning753ac612012-05-09 16:55:17 +0000609 yaffs2_checkpt_invalidate(dev);
Wolfgang Denk4b070802008-08-14 14:41:06 +0200610
Charles Manning753ac612012-05-09 16:55:17 +0000611 yaffs2_clear_oldest_dirty_seq(dev, bi);
William Juul0e8cc8b2007-11-15 11:13:05 +0100612
Charles Manning753ac612012-05-09 16:55:17 +0000613 if (yaffs_mark_bad(dev, flash_block) != YAFFS_OK) {
614 if (yaffs_erase_block(dev, flash_block) != YAFFS_OK) {
615 yaffs_trace(YAFFS_TRACE_ALWAYS,
616 "yaffs: Failed to mark bad and erase block %d",
617 flash_block);
618 } else {
619 struct yaffs_ext_tags tags;
620 int chunk_id =
621 flash_block * dev->param.chunks_per_block;
William Juul0e8cc8b2007-11-15 11:13:05 +0100622
Charles Manning753ac612012-05-09 16:55:17 +0000623 u8 *buffer = yaffs_get_temp_buffer(dev);
William Juul0e8cc8b2007-11-15 11:13:05 +0100624
Charles Manning753ac612012-05-09 16:55:17 +0000625 memset(buffer, 0xff, dev->data_bytes_per_chunk);
626 memset(&tags, 0, sizeof(tags));
627 tags.seq_number = YAFFS_SEQUENCE_BAD_BLOCK;
628 if (dev->param.write_chunk_tags_fn(dev, chunk_id -
629 dev->chunk_offset,
630 buffer,
631 &tags) != YAFFS_OK)
632 yaffs_trace(YAFFS_TRACE_ALWAYS,
633 "yaffs: Failed to write bad block marker to block %d",
634 flash_block);
Wolfgang Denk4b070802008-08-14 14:41:06 +0200635
Charles Manning753ac612012-05-09 16:55:17 +0000636 yaffs_release_temp_buffer(dev, buffer);
William Juul0e8cc8b2007-11-15 11:13:05 +0100637 }
William Juul0e8cc8b2007-11-15 11:13:05 +0100638 }
Wolfgang Denk4b070802008-08-14 14:41:06 +0200639
Charles Manning753ac612012-05-09 16:55:17 +0000640 bi->block_state = YAFFS_BLOCK_STATE_DEAD;
641 bi->gc_prioritise = 0;
642 bi->needs_retiring = 0;
William Juul0e8cc8b2007-11-15 11:13:05 +0100643
Charles Manning753ac612012-05-09 16:55:17 +0000644 dev->n_retired_blocks++;
645}
William Juul0e8cc8b2007-11-15 11:13:05 +0100646
Wolfgang Denk4b070802008-08-14 14:41:06 +0200647/*---------------- Name handling functions ------------*/
William Juul0e8cc8b2007-11-15 11:13:05 +0100648
Charles Manning753ac612012-05-09 16:55:17 +0000649static u16 yaffs_calc_name_sum(const YCHAR *name)
William Juul0e8cc8b2007-11-15 11:13:05 +0100650{
Charles Manning753ac612012-05-09 16:55:17 +0000651 u16 sum = 0;
652 u16 i = 1;
William Juul0e8cc8b2007-11-15 11:13:05 +0100653
Charles Manning753ac612012-05-09 16:55:17 +0000654 if (!name)
655 return 0;
William Juul0e8cc8b2007-11-15 11:13:05 +0100656
Charles Manning753ac612012-05-09 16:55:17 +0000657 while ((*name) && i < (YAFFS_MAX_NAME_LENGTH / 2)) {
658
659 /* 0x1f mask is case insensitive */
660 sum += ((*name) & 0x1f) * i;
661 i++;
662 name++;
William Juul0e8cc8b2007-11-15 11:13:05 +0100663 }
664 return sum;
665}
666
Charles Manning753ac612012-05-09 16:55:17 +0000667void yaffs_set_obj_name(struct yaffs_obj *obj, const YCHAR * name)
William Juul0e8cc8b2007-11-15 11:13:05 +0100668{
Charles Manning753ac612012-05-09 16:55:17 +0000669 memset(obj->short_name, 0, sizeof(obj->short_name));
670 if (name &&
671 yaffs_strnlen(name, YAFFS_SHORT_NAME_LENGTH + 1) <=
672 YAFFS_SHORT_NAME_LENGTH)
673 yaffs_strcpy(obj->short_name, name);
674 else
675 obj->short_name[0] = _Y('\0');
676 obj->sum = yaffs_calc_name_sum(name);
677}
678
679void yaffs_set_obj_name_from_oh(struct yaffs_obj *obj,
680 const struct yaffs_obj_hdr *oh)
681{
682#ifdef CONFIG_YAFFS_AUTO_UNICODE
683 YCHAR tmp_name[YAFFS_MAX_NAME_LENGTH + 1];
684 memset(tmp_name, 0, sizeof(tmp_name));
685 yaffs_load_name_from_oh(obj->my_dev, tmp_name, oh->name,
686 YAFFS_MAX_NAME_LENGTH + 1);
687 yaffs_set_obj_name(obj, tmp_name);
688#else
689 yaffs_set_obj_name(obj, oh->name);
William Juul0e8cc8b2007-11-15 11:13:05 +0100690#endif
Charles Manning753ac612012-05-09 16:55:17 +0000691}
692
693loff_t yaffs_max_file_size(struct yaffs_dev *dev)
694{
695 return ((loff_t) YAFFS_MAX_CHUNK_ID) * dev->data_bytes_per_chunk;
William Juul0e8cc8b2007-11-15 11:13:05 +0100696}
697
698/*-------------------- TNODES -------------------
699
700 * List of spare tnodes
701 * The list is hooked together using the first pointer
702 * in the tnode.
703 */
Wolfgang Denk4b070802008-08-14 14:41:06 +0200704
Charles Manning753ac612012-05-09 16:55:17 +0000705struct yaffs_tnode *yaffs_get_tnode(struct yaffs_dev *dev)
William Juul0e8cc8b2007-11-15 11:13:05 +0100706{
Charles Manning753ac612012-05-09 16:55:17 +0000707 struct yaffs_tnode *tn = yaffs_alloc_raw_tnode(dev);
William Juul0e8cc8b2007-11-15 11:13:05 +0100708
Charles Manning753ac612012-05-09 16:55:17 +0000709 if (tn) {
710 memset(tn, 0, dev->tnode_size);
711 dev->n_tnodes++;
William Juul0e8cc8b2007-11-15 11:13:05 +0100712 }
713
Charles Manning753ac612012-05-09 16:55:17 +0000714 dev->checkpoint_blocks_required = 0; /* force recalculation */
William Juul0e8cc8b2007-11-15 11:13:05 +0100715
Wolfgang Denk4b070802008-08-14 14:41:06 +0200716 return tn;
William Juul0e8cc8b2007-11-15 11:13:05 +0100717}
718
719/* FreeTnode frees up a tnode and puts it back on the free list */
Charles Manning753ac612012-05-09 16:55:17 +0000720static void yaffs_free_tnode(struct yaffs_dev *dev, struct yaffs_tnode *tn)
William Juul0e8cc8b2007-11-15 11:13:05 +0100721{
Charles Manning753ac612012-05-09 16:55:17 +0000722 yaffs_free_raw_tnode(dev, tn);
723 dev->n_tnodes--;
724 dev->checkpoint_blocks_required = 0; /* force recalculation */
725}
726
727static void yaffs_deinit_tnodes_and_objs(struct yaffs_dev *dev)
728{
729 yaffs_deinit_raw_tnodes_and_objs(dev);
730 dev->n_obj = 0;
731 dev->n_tnodes = 0;
732}
733
734void yaffs_load_tnode_0(struct yaffs_dev *dev, struct yaffs_tnode *tn,
735 unsigned pos, unsigned val)
736{
737 u32 *map = (u32 *) tn;
738 u32 bit_in_map;
739 u32 bit_in_word;
740 u32 word_in_map;
741 u32 mask;
742
743 pos &= YAFFS_TNODES_LEVEL0_MASK;
744 val >>= dev->chunk_grp_bits;
745
746 bit_in_map = pos * dev->tnode_width;
747 word_in_map = bit_in_map / 32;
748 bit_in_word = bit_in_map & (32 - 1);
749
750 mask = dev->tnode_mask << bit_in_word;
751
752 map[word_in_map] &= ~mask;
753 map[word_in_map] |= (mask & (val << bit_in_word));
754
755 if (dev->tnode_width > (32 - bit_in_word)) {
756 bit_in_word = (32 - bit_in_word);
757 word_in_map++;
758 mask =
759 dev->tnode_mask >> bit_in_word;
760 map[word_in_map] &= ~mask;
761 map[word_in_map] |= (mask & (val >> bit_in_word));
William Juul0e8cc8b2007-11-15 11:13:05 +0100762 }
763}
764
Charles Manning753ac612012-05-09 16:55:17 +0000765u32 yaffs_get_group_base(struct yaffs_dev *dev, struct yaffs_tnode *tn,
766 unsigned pos)
William Juul0e8cc8b2007-11-15 11:13:05 +0100767{
Charles Manning753ac612012-05-09 16:55:17 +0000768 u32 *map = (u32 *) tn;
769 u32 bit_in_map;
770 u32 bit_in_word;
771 u32 word_in_map;
772 u32 val;
William Juul0e8cc8b2007-11-15 11:13:05 +0100773
Charles Manning753ac612012-05-09 16:55:17 +0000774 pos &= YAFFS_TNODES_LEVEL0_MASK;
William Juul0e8cc8b2007-11-15 11:13:05 +0100775
Charles Manning753ac612012-05-09 16:55:17 +0000776 bit_in_map = pos * dev->tnode_width;
777 word_in_map = bit_in_map / 32;
778 bit_in_word = bit_in_map & (32 - 1);
William Juul0e8cc8b2007-11-15 11:13:05 +0100779
Charles Manning753ac612012-05-09 16:55:17 +0000780 val = map[word_in_map] >> bit_in_word;
781
782 if (dev->tnode_width > (32 - bit_in_word)) {
783 bit_in_word = (32 - bit_in_word);
784 word_in_map++;
785 val |= (map[word_in_map] << bit_in_word);
William Juul0e8cc8b2007-11-15 11:13:05 +0100786 }
787
Charles Manning753ac612012-05-09 16:55:17 +0000788 val &= dev->tnode_mask;
789 val <<= dev->chunk_grp_bits;
William Juul0e8cc8b2007-11-15 11:13:05 +0100790
Charles Manning753ac612012-05-09 16:55:17 +0000791 return val;
William Juul0e8cc8b2007-11-15 11:13:05 +0100792}
793
794/* ------------------- End of individual tnode manipulation -----------------*/
795
796/* ---------Functions to manipulate the look-up tree (made up of tnodes) ------
Charles Manning753ac612012-05-09 16:55:17 +0000797 * The look up tree is represented by the top tnode and the number of top_level
William Juul0e8cc8b2007-11-15 11:13:05 +0100798 * in the tree. 0 means only the level 0 tnode is in the tree.
799 */
800
801/* FindLevel0Tnode finds the level 0 tnode, if one exists. */
Charles Manning753ac612012-05-09 16:55:17 +0000802struct yaffs_tnode *yaffs_find_tnode_0(struct yaffs_dev *dev,
803 struct yaffs_file_var *file_struct,
804 u32 chunk_id)
William Juul0e8cc8b2007-11-15 11:13:05 +0100805{
Charles Manning753ac612012-05-09 16:55:17 +0000806 struct yaffs_tnode *tn = file_struct->top;
807 u32 i;
808 int required_depth;
809 int level = file_struct->top_level;
William Juul0e8cc8b2007-11-15 11:13:05 +0100810
William Juul0e8cc8b2007-11-15 11:13:05 +0100811 /* Check sane level and chunk Id */
Charles Manning753ac612012-05-09 16:55:17 +0000812 if (level < 0 || level > YAFFS_TNODES_MAX_LEVEL)
William Juul0e8cc8b2007-11-15 11:13:05 +0100813 return NULL;
William Juul0e8cc8b2007-11-15 11:13:05 +0100814
Charles Manning753ac612012-05-09 16:55:17 +0000815 if (chunk_id > YAFFS_MAX_CHUNK_ID)
William Juul0e8cc8b2007-11-15 11:13:05 +0100816 return NULL;
William Juul0e8cc8b2007-11-15 11:13:05 +0100817
Charles Manning753ac612012-05-09 16:55:17 +0000818 /* First check we're tall enough (ie enough top_level) */
William Juul0e8cc8b2007-11-15 11:13:05 +0100819
Charles Manning753ac612012-05-09 16:55:17 +0000820 i = chunk_id >> YAFFS_TNODES_LEVEL0_BITS;
821 required_depth = 0;
William Juul0e8cc8b2007-11-15 11:13:05 +0100822 while (i) {
823 i >>= YAFFS_TNODES_INTERNAL_BITS;
Charles Manning753ac612012-05-09 16:55:17 +0000824 required_depth++;
William Juul0e8cc8b2007-11-15 11:13:05 +0100825 }
826
Charles Manning753ac612012-05-09 16:55:17 +0000827 if (required_depth > file_struct->top_level)
828 return NULL; /* Not tall enough, so we can't find it */
William Juul0e8cc8b2007-11-15 11:13:05 +0100829
830 /* Traverse down to level 0 */
831 while (level > 0 && tn) {
Charles Manning753ac612012-05-09 16:55:17 +0000832 tn = tn->internal[(chunk_id >>
833 (YAFFS_TNODES_LEVEL0_BITS +
834 (level - 1) *
835 YAFFS_TNODES_INTERNAL_BITS)) &
836 YAFFS_TNODES_INTERNAL_MASK];
William Juul0e8cc8b2007-11-15 11:13:05 +0100837 level--;
William Juul0e8cc8b2007-11-15 11:13:05 +0100838 }
839
840 return tn;
841}
842
Charles Manning753ac612012-05-09 16:55:17 +0000843/* add_find_tnode_0 finds the level 0 tnode if it exists,
844 * otherwise first expands the tree.
William Juul0e8cc8b2007-11-15 11:13:05 +0100845 * This happens in two steps:
846 * 1. If the tree isn't tall enough, then make it taller.
847 * 2. Scan down the tree towards the level 0 tnode adding tnodes if required.
848 *
849 * Used when modifying the tree.
850 *
Charles Manning753ac612012-05-09 16:55:17 +0000851 * If the tn argument is NULL, then a fresh tnode will be added otherwise the
852 * specified tn will be plugged into the ttree.
William Juul0e8cc8b2007-11-15 11:13:05 +0100853 */
Wolfgang Denk4b070802008-08-14 14:41:06 +0200854
Charles Manning753ac612012-05-09 16:55:17 +0000855struct yaffs_tnode *yaffs_add_find_tnode_0(struct yaffs_dev *dev,
856 struct yaffs_file_var *file_struct,
857 u32 chunk_id,
858 struct yaffs_tnode *passed_tn)
William Juul0e8cc8b2007-11-15 11:13:05 +0100859{
Charles Manning753ac612012-05-09 16:55:17 +0000860 int required_depth;
William Juul0e8cc8b2007-11-15 11:13:05 +0100861 int i;
862 int l;
Charles Manning753ac612012-05-09 16:55:17 +0000863 struct yaffs_tnode *tn;
864 u32 x;
William Juul0e8cc8b2007-11-15 11:13:05 +0100865
866 /* Check sane level and page Id */
Charles Manning753ac612012-05-09 16:55:17 +0000867 if (file_struct->top_level < 0 ||
868 file_struct->top_level > YAFFS_TNODES_MAX_LEVEL)
William Juul0e8cc8b2007-11-15 11:13:05 +0100869 return NULL;
William Juul0e8cc8b2007-11-15 11:13:05 +0100870
Charles Manning753ac612012-05-09 16:55:17 +0000871 if (chunk_id > YAFFS_MAX_CHUNK_ID)
William Juul0e8cc8b2007-11-15 11:13:05 +0100872 return NULL;
William Juul0e8cc8b2007-11-15 11:13:05 +0100873
Charles Manning753ac612012-05-09 16:55:17 +0000874 /* First check we're tall enough (ie enough top_level) */
William Juul0e8cc8b2007-11-15 11:13:05 +0100875
Charles Manning753ac612012-05-09 16:55:17 +0000876 x = chunk_id >> YAFFS_TNODES_LEVEL0_BITS;
877 required_depth = 0;
William Juul0e8cc8b2007-11-15 11:13:05 +0100878 while (x) {
879 x >>= YAFFS_TNODES_INTERNAL_BITS;
Charles Manning753ac612012-05-09 16:55:17 +0000880 required_depth++;
William Juul0e8cc8b2007-11-15 11:13:05 +0100881 }
882
Charles Manning753ac612012-05-09 16:55:17 +0000883 if (required_depth > file_struct->top_level) {
884 /* Not tall enough, gotta make the tree taller */
885 for (i = file_struct->top_level; i < required_depth; i++) {
William Juul0e8cc8b2007-11-15 11:13:05 +0100886
Charles Manning753ac612012-05-09 16:55:17 +0000887 tn = yaffs_get_tnode(dev);
William Juul0e8cc8b2007-11-15 11:13:05 +0100888
889 if (tn) {
Charles Manning753ac612012-05-09 16:55:17 +0000890 tn->internal[0] = file_struct->top;
891 file_struct->top = tn;
892 file_struct->top_level++;
William Juul0e8cc8b2007-11-15 11:13:05 +0100893 } else {
Charles Manning753ac612012-05-09 16:55:17 +0000894 yaffs_trace(YAFFS_TRACE_ERROR,
895 "yaffs: no more tnodes");
896 return NULL;
William Juul0e8cc8b2007-11-15 11:13:05 +0100897 }
898 }
William Juul0e8cc8b2007-11-15 11:13:05 +0100899 }
900
901 /* Traverse down to level 0, adding anything we need */
902
Charles Manning753ac612012-05-09 16:55:17 +0000903 l = file_struct->top_level;
904 tn = file_struct->top;
Wolfgang Denk4b070802008-08-14 14:41:06 +0200905
Charles Manning753ac612012-05-09 16:55:17 +0000906 if (l > 0) {
William Juul0e8cc8b2007-11-15 11:13:05 +0100907 while (l > 0 && tn) {
Charles Manning753ac612012-05-09 16:55:17 +0000908 x = (chunk_id >>
909 (YAFFS_TNODES_LEVEL0_BITS +
William Juul0e8cc8b2007-11-15 11:13:05 +0100910 (l - 1) * YAFFS_TNODES_INTERNAL_BITS)) &
911 YAFFS_TNODES_INTERNAL_MASK;
912
Charles Manning753ac612012-05-09 16:55:17 +0000913 if ((l > 1) && !tn->internal[x]) {
William Juul0e8cc8b2007-11-15 11:13:05 +0100914 /* Add missing non-level-zero tnode */
Charles Manning753ac612012-05-09 16:55:17 +0000915 tn->internal[x] = yaffs_get_tnode(dev);
916 if (!tn->internal[x])
917 return NULL;
918 } else if (l == 1) {
William Juul0e8cc8b2007-11-15 11:13:05 +0100919 /* Looking from level 1 at level 0 */
Charles Manning753ac612012-05-09 16:55:17 +0000920 if (passed_tn) {
921 /* If we already have one, release it */
922 if (tn->internal[x])
923 yaffs_free_tnode(dev,
924 tn->internal[x]);
925 tn->internal[x] = passed_tn;
Wolfgang Denk4b070802008-08-14 14:41:06 +0200926
Charles Manning753ac612012-05-09 16:55:17 +0000927 } else if (!tn->internal[x]) {
William Juul0e8cc8b2007-11-15 11:13:05 +0100928 /* Don't have one, none passed in */
Charles Manning753ac612012-05-09 16:55:17 +0000929 tn->internal[x] = yaffs_get_tnode(dev);
930 if (!tn->internal[x])
931 return NULL;
William Juul0e8cc8b2007-11-15 11:13:05 +0100932 }
933 }
Wolfgang Denk4b070802008-08-14 14:41:06 +0200934
William Juul0e8cc8b2007-11-15 11:13:05 +0100935 tn = tn->internal[x];
936 l--;
937 }
938 } else {
939 /* top is level 0 */
Charles Manning753ac612012-05-09 16:55:17 +0000940 if (passed_tn) {
941 memcpy(tn, passed_tn,
942 (dev->tnode_width * YAFFS_NTNODES_LEVEL0) / 8);
943 yaffs_free_tnode(dev, passed_tn);
William Juul0e8cc8b2007-11-15 11:13:05 +0100944 }
945 }
946
947 return tn;
948}
949
Charles Manning753ac612012-05-09 16:55:17 +0000950static int yaffs_tags_match(const struct yaffs_ext_tags *tags, int obj_id,
951 int chunk_obj)
952{
953 return (tags->chunk_id == chunk_obj &&
954 tags->obj_id == obj_id &&
955 !tags->is_deleted) ? 1 : 0;
956
957}
958
959static int yaffs_find_chunk_in_group(struct yaffs_dev *dev, int the_chunk,
960 struct yaffs_ext_tags *tags, int obj_id,
961 int inode_chunk)
William Juul0e8cc8b2007-11-15 11:13:05 +0100962{
963 int j;
964
Charles Manning753ac612012-05-09 16:55:17 +0000965 for (j = 0; the_chunk && j < dev->chunk_grp_size; j++) {
966 if (yaffs_check_chunk_bit
967 (dev, the_chunk / dev->param.chunks_per_block,
968 the_chunk % dev->param.chunks_per_block)) {
William Juul0e8cc8b2007-11-15 11:13:05 +0100969
Charles Manning753ac612012-05-09 16:55:17 +0000970 if (dev->chunk_grp_size == 1)
971 return the_chunk;
972 else {
973 yaffs_rd_chunk_tags_nand(dev, the_chunk, NULL,
974 tags);
975 if (yaffs_tags_match(tags,
976 obj_id, inode_chunk)) {
977 /* found it; */
978 return the_chunk;
979 }
William Juul0e8cc8b2007-11-15 11:13:05 +0100980 }
981 }
Charles Manning753ac612012-05-09 16:55:17 +0000982 the_chunk++;
William Juul0e8cc8b2007-11-15 11:13:05 +0100983 }
984 return -1;
985}
986
Charles Manning753ac612012-05-09 16:55:17 +0000987static int yaffs_find_chunk_in_file(struct yaffs_obj *in, int inode_chunk,
988 struct yaffs_ext_tags *tags)
William Juul0e8cc8b2007-11-15 11:13:05 +0100989{
Charles Manning753ac612012-05-09 16:55:17 +0000990 /*Get the Tnode, then get the level 0 offset chunk offset */
991 struct yaffs_tnode *tn;
992 int the_chunk = -1;
993 struct yaffs_ext_tags local_tags;
994 int ret_val = -1;
995 struct yaffs_dev *dev = in->my_dev;
William Juul0e8cc8b2007-11-15 11:13:05 +0100996
Charles Manning753ac612012-05-09 16:55:17 +0000997 if (!tags) {
998 /* Passed a NULL, so use our own tags space */
999 tags = &local_tags;
1000 }
William Juul0e8cc8b2007-11-15 11:13:05 +01001001
Charles Manning753ac612012-05-09 16:55:17 +00001002 tn = yaffs_find_tnode_0(dev, &in->variant.file_variant, inode_chunk);
William Juul0e8cc8b2007-11-15 11:13:05 +01001003
Charles Manning753ac612012-05-09 16:55:17 +00001004 if (!tn)
1005 return ret_val;
1006
1007 the_chunk = yaffs_get_group_base(dev, tn, inode_chunk);
1008
1009 ret_val = yaffs_find_chunk_in_group(dev, the_chunk, tags, in->obj_id,
1010 inode_chunk);
1011 return ret_val;
1012}
1013
1014static int yaffs_find_del_file_chunk(struct yaffs_obj *in, int inode_chunk,
1015 struct yaffs_ext_tags *tags)
1016{
1017 /* Get the Tnode, then get the level 0 offset chunk offset */
1018 struct yaffs_tnode *tn;
1019 int the_chunk = -1;
1020 struct yaffs_ext_tags local_tags;
1021 struct yaffs_dev *dev = in->my_dev;
1022 int ret_val = -1;
1023
1024 if (!tags) {
1025 /* Passed a NULL, so use our own tags space */
1026 tags = &local_tags;
1027 }
1028
1029 tn = yaffs_find_tnode_0(dev, &in->variant.file_variant, inode_chunk);
1030
1031 if (!tn)
1032 return ret_val;
1033
1034 the_chunk = yaffs_get_group_base(dev, tn, inode_chunk);
1035
1036 ret_val = yaffs_find_chunk_in_group(dev, the_chunk, tags, in->obj_id,
1037 inode_chunk);
1038
1039 /* Delete the entry in the filestructure (if found) */
1040 if (ret_val != -1)
1041 yaffs_load_tnode_0(dev, tn, inode_chunk, 0);
1042
1043 return ret_val;
1044}
1045
1046int yaffs_put_chunk_in_file(struct yaffs_obj *in, int inode_chunk,
1047 int nand_chunk, int in_scan)
1048{
1049 /* NB in_scan is zero unless scanning.
1050 * For forward scanning, in_scan is > 0;
1051 * for backward scanning in_scan is < 0
1052 *
1053 * nand_chunk = 0 is a dummy insert to make sure the tnodes are there.
1054 */
1055
1056 struct yaffs_tnode *tn;
1057 struct yaffs_dev *dev = in->my_dev;
1058 int existing_cunk;
1059 struct yaffs_ext_tags existing_tags;
1060 struct yaffs_ext_tags new_tags;
1061 unsigned existing_serial, new_serial;
1062
1063 if (in->variant_type != YAFFS_OBJECT_TYPE_FILE) {
1064 /* Just ignore an attempt at putting a chunk into a non-file
1065 * during scanning.
1066 * If it is not during Scanning then something went wrong!
1067 */
1068 if (!in_scan) {
1069 yaffs_trace(YAFFS_TRACE_ERROR,
1070 "yaffs tragedy:attempt to put data chunk into a non-file"
1071 );
1072 BUG();
1073 }
1074
1075 yaffs_chunk_del(dev, nand_chunk, 1, __LINE__);
1076 return YAFFS_OK;
1077 }
1078
1079 tn = yaffs_add_find_tnode_0(dev,
1080 &in->variant.file_variant,
1081 inode_chunk, NULL);
1082 if (!tn)
1083 return YAFFS_FAIL;
1084
1085 if (!nand_chunk)
1086 /* Dummy insert, bail now */
1087 return YAFFS_OK;
1088
1089 existing_cunk = yaffs_get_group_base(dev, tn, inode_chunk);
1090
1091 if (in_scan != 0) {
1092 /* If we're scanning then we need to test for duplicates
1093 * NB This does not need to be efficient since it should only
1094 * happen when the power fails during a write, then only one
1095 * chunk should ever be affected.
1096 *
1097 * Correction for YAFFS2: This could happen quite a lot and we
1098 * need to think about efficiency! TODO
1099 * Update: For backward scanning we don't need to re-read tags
1100 * so this is quite cheap.
1101 */
1102
1103 if (existing_cunk > 0) {
1104 /* NB Right now existing chunk will not be real
1105 * chunk_id if the chunk group size > 1
1106 * thus we have to do a FindChunkInFile to get the
1107 * real chunk id.
1108 *
1109 * We have a duplicate now we need to decide which
1110 * one to use:
1111 *
1112 * Backwards scanning YAFFS2: The old one is what
1113 * we use, dump the new one.
1114 * YAFFS1: Get both sets of tags and compare serial
1115 * numbers.
1116 */
1117
1118 if (in_scan > 0) {
1119 /* Only do this for forward scanning */
1120 yaffs_rd_chunk_tags_nand(dev,
1121 nand_chunk,
1122 NULL, &new_tags);
1123
1124 /* Do a proper find */
1125 existing_cunk =
1126 yaffs_find_chunk_in_file(in, inode_chunk,
1127 &existing_tags);
1128 }
1129
1130 if (existing_cunk <= 0) {
1131 /*Hoosterman - how did this happen? */
1132
1133 yaffs_trace(YAFFS_TRACE_ERROR,
1134 "yaffs tragedy: existing chunk < 0 in scan"
1135 );
1136
1137 }
1138
1139 /* NB The deleted flags should be false, otherwise
1140 * the chunks will not be loaded during a scan
1141 */
1142
1143 if (in_scan > 0) {
1144 new_serial = new_tags.serial_number;
1145 existing_serial = existing_tags.serial_number;
1146 }
1147
1148 if ((in_scan > 0) &&
1149 (existing_cunk <= 0 ||
1150 ((existing_serial + 1) & 3) == new_serial)) {
1151 /* Forward scanning.
1152 * Use new
1153 * Delete the old one and drop through to
1154 * update the tnode
1155 */
1156 yaffs_chunk_del(dev, existing_cunk, 1,
1157 __LINE__);
1158 } else {
1159 /* Backward scanning or we want to use the
1160 * existing one
1161 * Delete the new one and return early so that
1162 * the tnode isn't changed
1163 */
1164 yaffs_chunk_del(dev, nand_chunk, 1, __LINE__);
1165 return YAFFS_OK;
1166 }
1167 }
1168
1169 }
1170
1171 if (existing_cunk == 0)
1172 in->n_data_chunks++;
1173
1174 yaffs_load_tnode_0(dev, tn, inode_chunk, nand_chunk);
1175
1176 return YAFFS_OK;
1177}
1178
1179static void yaffs_soft_del_chunk(struct yaffs_dev *dev, int chunk)
1180{
1181 struct yaffs_block_info *the_block;
1182 unsigned block_no;
1183
1184 yaffs_trace(YAFFS_TRACE_DELETION, "soft delete chunk %d", chunk);
1185
1186 block_no = chunk / dev->param.chunks_per_block;
1187 the_block = yaffs_get_block_info(dev, block_no);
1188 if (the_block) {
1189 the_block->soft_del_pages++;
1190 dev->n_free_chunks++;
1191 yaffs2_update_oldest_dirty_seq(dev, block_no, the_block);
William Juul0e8cc8b2007-11-15 11:13:05 +01001192 }
1193}
1194
Charles Manning753ac612012-05-09 16:55:17 +00001195/* SoftDeleteWorker scans backwards through the tnode tree and soft deletes all
1196 * the chunks in the file.
1197 * All soft deleting does is increment the block's softdelete count and pulls
1198 * the chunk out of the tnode.
1199 * Thus, essentially this is the same as DeleteWorker except that the chunks
1200 * are soft deleted.
William Juul0e8cc8b2007-11-15 11:13:05 +01001201 */
Wolfgang Denk4b070802008-08-14 14:41:06 +02001202
Charles Manning753ac612012-05-09 16:55:17 +00001203static int yaffs_soft_del_worker(struct yaffs_obj *in, struct yaffs_tnode *tn,
1204 u32 level, int chunk_offset)
William Juul0e8cc8b2007-11-15 11:13:05 +01001205{
1206 int i;
Charles Manning753ac612012-05-09 16:55:17 +00001207 int the_chunk;
1208 int all_done = 1;
1209 struct yaffs_dev *dev = in->my_dev;
William Juul0e8cc8b2007-11-15 11:13:05 +01001210
Charles Manning753ac612012-05-09 16:55:17 +00001211 if (!tn)
1212 return 1;
William Juul0e8cc8b2007-11-15 11:13:05 +01001213
Charles Manning753ac612012-05-09 16:55:17 +00001214 if (level > 0) {
1215 for (i = YAFFS_NTNODES_INTERNAL - 1;
1216 all_done && i >= 0;
1217 i--) {
1218 if (tn->internal[i]) {
1219 all_done =
1220 yaffs_soft_del_worker(in,
1221 tn->internal[i],
1222 level - 1,
1223 (chunk_offset <<
1224 YAFFS_TNODES_INTERNAL_BITS)
1225 + i);
1226 if (all_done) {
1227 yaffs_free_tnode(dev,
1228 tn->internal[i]);
1229 tn->internal[i] = NULL;
1230 } else {
1231 /* Can this happen? */
William Juul0e8cc8b2007-11-15 11:13:05 +01001232 }
1233 }
William Juul0e8cc8b2007-11-15 11:13:05 +01001234 }
Charles Manning753ac612012-05-09 16:55:17 +00001235 return (all_done) ? 1 : 0;
William Juul0e8cc8b2007-11-15 11:13:05 +01001236 }
1237
Charles Manning753ac612012-05-09 16:55:17 +00001238 /* level 0 */
1239 for (i = YAFFS_NTNODES_LEVEL0 - 1; i >= 0; i--) {
1240 the_chunk = yaffs_get_group_base(dev, tn, i);
1241 if (the_chunk) {
1242 yaffs_soft_del_chunk(dev, the_chunk);
1243 yaffs_load_tnode_0(dev, tn, i, 0);
1244 }
1245 }
William Juul0e8cc8b2007-11-15 11:13:05 +01001246 return 1;
Charles Manning753ac612012-05-09 16:55:17 +00001247}
1248
1249static void yaffs_remove_obj_from_dir(struct yaffs_obj *obj)
1250{
1251 struct yaffs_dev *dev = obj->my_dev;
1252 struct yaffs_obj *parent;
1253
1254 yaffs_verify_obj_in_dir(obj);
1255 parent = obj->parent;
1256
1257 yaffs_verify_dir(parent);
1258
1259 if (dev && dev->param.remove_obj_fn)
1260 dev->param.remove_obj_fn(obj);
1261
1262 list_del_init(&obj->siblings);
1263 obj->parent = NULL;
1264
1265 yaffs_verify_dir(parent);
1266}
1267
1268void yaffs_add_obj_to_dir(struct yaffs_obj *directory, struct yaffs_obj *obj)
1269{
1270 if (!directory) {
1271 yaffs_trace(YAFFS_TRACE_ALWAYS,
1272 "tragedy: Trying to add an object to a null pointer directory"
1273 );
1274 BUG();
1275 return;
1276 }
1277 if (directory->variant_type != YAFFS_OBJECT_TYPE_DIRECTORY) {
1278 yaffs_trace(YAFFS_TRACE_ALWAYS,
1279 "tragedy: Trying to add an object to a non-directory"
1280 );
1281 BUG();
1282 }
1283
1284 if (obj->siblings.prev == NULL) {
1285 /* Not initialised */
1286 BUG();
1287 }
1288
1289 yaffs_verify_dir(directory);
1290
1291 yaffs_remove_obj_from_dir(obj);
1292
1293 /* Now add it */
1294 list_add(&obj->siblings, &directory->variant.dir_variant.children);
1295 obj->parent = directory;
1296
1297 if (directory == obj->my_dev->unlinked_dir
1298 || directory == obj->my_dev->del_dir) {
1299 obj->unlinked = 1;
1300 obj->my_dev->n_unlinked_files++;
1301 obj->rename_allowed = 0;
1302 }
1303
1304 yaffs_verify_dir(directory);
1305 yaffs_verify_obj_in_dir(obj);
1306}
1307
1308static int yaffs_change_obj_name(struct yaffs_obj *obj,
1309 struct yaffs_obj *new_dir,
1310 const YCHAR *new_name, int force, int shadows)
1311{
1312 int unlink_op;
1313 int del_op;
1314 struct yaffs_obj *existing_target;
1315
1316 if (new_dir == NULL)
1317 new_dir = obj->parent; /* use the old directory */
1318
1319 if (new_dir->variant_type != YAFFS_OBJECT_TYPE_DIRECTORY) {
1320 yaffs_trace(YAFFS_TRACE_ALWAYS,
1321 "tragedy: yaffs_change_obj_name: new_dir is not a directory"
1322 );
1323 BUG();
1324 }
1325
1326 unlink_op = (new_dir == obj->my_dev->unlinked_dir);
1327 del_op = (new_dir == obj->my_dev->del_dir);
1328
1329 existing_target = yaffs_find_by_name(new_dir, new_name);
1330
1331 /* If the object is a file going into the unlinked directory,
1332 * then it is OK to just stuff it in since duplicate names are OK.
1333 * else only proceed if the new name does not exist and we're putting
1334 * it into a directory.
1335 */
1336 if (!(unlink_op || del_op || force ||
1337 shadows > 0 || !existing_target) ||
1338 new_dir->variant_type != YAFFS_OBJECT_TYPE_DIRECTORY)
1339 return YAFFS_FAIL;
1340
1341 yaffs_set_obj_name(obj, new_name);
1342 obj->dirty = 1;
1343 yaffs_add_obj_to_dir(new_dir, obj);
1344
1345 if (unlink_op)
1346 obj->unlinked = 1;
1347
1348 /* If it is a deletion then we mark it as a shrink for gc */
1349 if (yaffs_update_oh(obj, new_name, 0, del_op, shadows, NULL) >= 0)
1350 return YAFFS_OK;
1351
1352 return YAFFS_FAIL;
1353}
1354
1355/*------------------------ Short Operations Cache ------------------------------
1356 * In many situations where there is no high level buffering a lot of
1357 * reads might be short sequential reads, and a lot of writes may be short
1358 * sequential writes. eg. scanning/writing a jpeg file.
1359 * In these cases, a short read/write cache can provide a huge perfomance
1360 * benefit with dumb-as-a-rock code.
1361 * In Linux, the page cache provides read buffering and the short op cache
1362 * provides write buffering.
1363 *
1364 * There are a small number (~10) of cache chunks per device so that we don't
1365 * need a very intelligent search.
1366 */
1367
1368static int yaffs_obj_cache_dirty(struct yaffs_obj *obj)
1369{
1370 struct yaffs_dev *dev = obj->my_dev;
1371 int i;
1372 struct yaffs_cache *cache;
1373 int n_caches = obj->my_dev->param.n_caches;
1374
1375 for (i = 0; i < n_caches; i++) {
1376 cache = &dev->cache[i];
1377 if (cache->object == obj && cache->dirty)
1378 return 1;
1379 }
1380
1381 return 0;
1382}
1383
1384static void yaffs_flush_file_cache(struct yaffs_obj *obj)
1385{
1386 struct yaffs_dev *dev = obj->my_dev;
1387 int lowest = -99; /* Stop compiler whining. */
1388 int i;
1389 struct yaffs_cache *cache;
1390 int chunk_written = 0;
1391 int n_caches = obj->my_dev->param.n_caches;
1392
1393 if (n_caches < 1)
1394 return;
1395 do {
1396 cache = NULL;
1397
1398 /* Find the lowest dirty chunk for this object */
1399 for (i = 0; i < n_caches; i++) {
1400 if (dev->cache[i].object == obj &&
1401 dev->cache[i].dirty) {
1402 if (!cache ||
1403 dev->cache[i].chunk_id < lowest) {
1404 cache = &dev->cache[i];
1405 lowest = cache->chunk_id;
1406 }
1407 }
1408 }
1409
1410 if (cache && !cache->locked) {
1411 /* Write it out and free it up */
1412 chunk_written =
1413 yaffs_wr_data_obj(cache->object,
1414 cache->chunk_id,
1415 cache->data,
1416 cache->n_bytes, 1);
1417 cache->dirty = 0;
1418 cache->object = NULL;
1419 }
1420 } while (cache && chunk_written > 0);
1421
1422 if (cache)
1423 /* Hoosterman, disk full while writing cache out. */
1424 yaffs_trace(YAFFS_TRACE_ERROR,
1425 "yaffs tragedy: no space during cache write");
1426}
1427
1428/*yaffs_flush_whole_cache(dev)
1429 *
1430 *
1431 */
1432
1433void yaffs_flush_whole_cache(struct yaffs_dev *dev)
1434{
1435 struct yaffs_obj *obj;
1436 int n_caches = dev->param.n_caches;
1437 int i;
1438
1439 /* Find a dirty object in the cache and flush it...
1440 * until there are no further dirty objects.
1441 */
1442 do {
1443 obj = NULL;
1444 for (i = 0; i < n_caches && !obj; i++) {
1445 if (dev->cache[i].object && dev->cache[i].dirty)
1446 obj = dev->cache[i].object;
1447 }
1448 if (obj)
1449 yaffs_flush_file_cache(obj);
1450 } while (obj);
William Juul0e8cc8b2007-11-15 11:13:05 +01001451
1452}
1453
Charles Manning753ac612012-05-09 16:55:17 +00001454/* Grab us a cache chunk for use.
1455 * First look for an empty one.
1456 * Then look for the least recently used non-dirty one.
1457 * Then look for the least recently used dirty one...., flush and look again.
1458 */
1459static struct yaffs_cache *yaffs_grab_chunk_worker(struct yaffs_dev *dev)
William Juul0e8cc8b2007-11-15 11:13:05 +01001460{
Charles Manning753ac612012-05-09 16:55:17 +00001461 int i;
1462
1463 if (dev->param.n_caches > 0) {
1464 for (i = 0; i < dev->param.n_caches; i++) {
1465 if (!dev->cache[i].object)
1466 return &dev->cache[i];
William Juul0e8cc8b2007-11-15 11:13:05 +01001467 }
1468 }
Charles Manning753ac612012-05-09 16:55:17 +00001469 return NULL;
1470}
1471
1472static struct yaffs_cache *yaffs_grab_chunk_cache(struct yaffs_dev *dev)
1473{
1474 struct yaffs_cache *cache;
1475 struct yaffs_obj *the_obj;
1476 int usage;
1477 int i;
Charles Manning753ac612012-05-09 16:55:17 +00001478
1479 if (dev->param.n_caches < 1)
1480 return NULL;
1481
1482 /* Try find a non-dirty one... */
1483
1484 cache = yaffs_grab_chunk_worker(dev);
1485
1486 if (!cache) {
1487 /* They were all dirty, find the LRU object and flush
1488 * its cache, then find again.
1489 * NB what's here is not very accurate,
1490 * we actually flush the object with the LRU chunk.
1491 */
1492
1493 /* With locking we can't assume we can use entry zero,
1494 * Set the_obj to a valid pointer for Coverity. */
1495 the_obj = dev->cache[0].object;
1496 usage = -1;
1497 cache = NULL;
Charles Manning753ac612012-05-09 16:55:17 +00001498
1499 for (i = 0; i < dev->param.n_caches; i++) {
1500 if (dev->cache[i].object &&
1501 !dev->cache[i].locked &&
1502 (dev->cache[i].last_use < usage ||
1503 !cache)) {
1504 usage = dev->cache[i].last_use;
1505 the_obj = dev->cache[i].object;
1506 cache = &dev->cache[i];
Charles Manning753ac612012-05-09 16:55:17 +00001507 }
1508 }
1509
1510 if (!cache || cache->dirty) {
1511 /* Flush and try again */
1512 yaffs_flush_file_cache(the_obj);
1513 cache = yaffs_grab_chunk_worker(dev);
1514 }
1515 }
1516 return cache;
1517}
1518
1519/* Find a cached chunk */
1520static struct yaffs_cache *yaffs_find_chunk_cache(const struct yaffs_obj *obj,
1521 int chunk_id)
1522{
1523 struct yaffs_dev *dev = obj->my_dev;
1524 int i;
1525
1526 if (dev->param.n_caches < 1)
1527 return NULL;
1528
1529 for (i = 0; i < dev->param.n_caches; i++) {
1530 if (dev->cache[i].object == obj &&
1531 dev->cache[i].chunk_id == chunk_id) {
1532 dev->cache_hits++;
1533
1534 return &dev->cache[i];
1535 }
1536 }
1537 return NULL;
1538}
1539
1540/* Mark the chunk for the least recently used algorithym */
1541static void yaffs_use_cache(struct yaffs_dev *dev, struct yaffs_cache *cache,
1542 int is_write)
1543{
1544 int i;
1545
1546 if (dev->param.n_caches < 1)
1547 return;
1548
1549 if (dev->cache_last_use < 0 ||
1550 dev->cache_last_use > 100000000) {
1551 /* Reset the cache usages */
1552 for (i = 1; i < dev->param.n_caches; i++)
1553 dev->cache[i].last_use = 0;
1554
1555 dev->cache_last_use = 0;
1556 }
1557 dev->cache_last_use++;
1558 cache->last_use = dev->cache_last_use;
1559
1560 if (is_write)
1561 cache->dirty = 1;
1562}
1563
1564/* Invalidate a single cache page.
1565 * Do this when a whole page gets written,
1566 * ie the short cache for this page is no longer valid.
1567 */
1568static void yaffs_invalidate_chunk_cache(struct yaffs_obj *object, int chunk_id)
1569{
1570 struct yaffs_cache *cache;
1571
1572 if (object->my_dev->param.n_caches > 0) {
1573 cache = yaffs_find_chunk_cache(object, chunk_id);
1574
1575 if (cache)
1576 cache->object = NULL;
1577 }
1578}
1579
1580/* Invalidate all the cache pages associated with this object
1581 * Do this whenever ther file is deleted or resized.
1582 */
1583static void yaffs_invalidate_whole_cache(struct yaffs_obj *in)
1584{
1585 int i;
1586 struct yaffs_dev *dev = in->my_dev;
1587
1588 if (dev->param.n_caches > 0) {
1589 /* Invalidate it. */
1590 for (i = 0; i < dev->param.n_caches; i++) {
1591 if (dev->cache[i].object == in)
1592 dev->cache[i].object = NULL;
1593 }
1594 }
1595}
1596
1597static void yaffs_unhash_obj(struct yaffs_obj *obj)
1598{
1599 int bucket;
1600 struct yaffs_dev *dev = obj->my_dev;
1601
1602 /* If it is still linked into the bucket list, free from the list */
1603 if (!list_empty(&obj->hash_link)) {
1604 list_del_init(&obj->hash_link);
1605 bucket = yaffs_hash_fn(obj->obj_id);
1606 dev->obj_bucket[bucket].count--;
1607 }
1608}
1609
1610/* FreeObject frees up a Object and puts it back on the free list */
1611static void yaffs_free_obj(struct yaffs_obj *obj)
1612{
1613 struct yaffs_dev *dev;
1614
1615 if (!obj) {
1616 BUG();
1617 return;
1618 }
1619 dev = obj->my_dev;
1620 yaffs_trace(YAFFS_TRACE_OS, "FreeObject %p inode %p",
1621 obj, obj->my_inode);
1622 if (obj->parent)
1623 BUG();
1624 if (!list_empty(&obj->siblings))
1625 BUG();
1626
1627 if (obj->my_inode) {
1628 /* We're still hooked up to a cached inode.
1629 * Don't delete now, but mark for later deletion
1630 */
1631 obj->defered_free = 1;
1632 return;
1633 }
1634
1635 yaffs_unhash_obj(obj);
1636
1637 yaffs_free_raw_obj(dev, obj);
1638 dev->n_obj--;
1639 dev->checkpoint_blocks_required = 0; /* force recalculation */
1640}
1641
1642void yaffs_handle_defered_free(struct yaffs_obj *obj)
1643{
1644 if (obj->defered_free)
1645 yaffs_free_obj(obj);
1646}
1647
1648static int yaffs_generic_obj_del(struct yaffs_obj *in)
1649{
1650 /* Iinvalidate the file's data in the cache, without flushing. */
1651 yaffs_invalidate_whole_cache(in);
1652
1653 if (in->my_dev->param.is_yaffs2 && in->parent != in->my_dev->del_dir) {
1654 /* Move to unlinked directory so we have a deletion record */
1655 yaffs_change_obj_name(in, in->my_dev->del_dir, _Y("deleted"), 0,
1656 0);
1657 }
1658
1659 yaffs_remove_obj_from_dir(in);
1660 yaffs_chunk_del(in->my_dev, in->hdr_chunk, 1, __LINE__);
1661 in->hdr_chunk = 0;
1662
1663 yaffs_free_obj(in);
1664 return YAFFS_OK;
1665
1666}
1667
1668static void yaffs_soft_del_file(struct yaffs_obj *obj)
1669{
1670 if (!obj->deleted ||
1671 obj->variant_type != YAFFS_OBJECT_TYPE_FILE ||
1672 obj->soft_del)
1673 return;
1674
1675 if (obj->n_data_chunks <= 0) {
1676 /* Empty file with no duplicate object headers,
1677 * just delete it immediately */
1678 yaffs_free_tnode(obj->my_dev, obj->variant.file_variant.top);
1679 obj->variant.file_variant.top = NULL;
1680 yaffs_trace(YAFFS_TRACE_TRACING,
1681 "yaffs: Deleting empty file %d",
1682 obj->obj_id);
1683 yaffs_generic_obj_del(obj);
1684 } else {
1685 yaffs_soft_del_worker(obj,
1686 obj->variant.file_variant.top,
1687 obj->variant.
1688 file_variant.top_level, 0);
1689 obj->soft_del = 1;
1690 }
William Juul0e8cc8b2007-11-15 11:13:05 +01001691}
1692
1693/* Pruning removes any part of the file structure tree that is beyond the
1694 * bounds of the file (ie that does not point to chunks).
1695 *
1696 * A file should only get pruned when its size is reduced.
1697 *
1698 * Before pruning, the chunks must be pulled from the tree and the
1699 * level 0 tnode entries must be zeroed out.
1700 * Could also use this for file deletion, but that's probably better handled
1701 * by a special case.
Charles Manning753ac612012-05-09 16:55:17 +00001702 *
1703 * This function is recursive. For levels > 0 the function is called again on
1704 * any sub-tree. For level == 0 we just check if the sub-tree has data.
1705 * If there is no data in a subtree then it is pruned.
William Juul0e8cc8b2007-11-15 11:13:05 +01001706 */
1707
Charles Manning753ac612012-05-09 16:55:17 +00001708static struct yaffs_tnode *yaffs_prune_worker(struct yaffs_dev *dev,
1709 struct yaffs_tnode *tn, u32 level,
1710 int del0)
William Juul0e8cc8b2007-11-15 11:13:05 +01001711{
1712 int i;
Charles Manning753ac612012-05-09 16:55:17 +00001713 int has_data;
William Juul0e8cc8b2007-11-15 11:13:05 +01001714
Charles Manning753ac612012-05-09 16:55:17 +00001715 if (!tn)
1716 return tn;
William Juul0e8cc8b2007-11-15 11:13:05 +01001717
Charles Manning753ac612012-05-09 16:55:17 +00001718 has_data = 0;
1719
1720 if (level > 0) {
William Juul0e8cc8b2007-11-15 11:13:05 +01001721 for (i = 0; i < YAFFS_NTNODES_INTERNAL; i++) {
William Juul0e8cc8b2007-11-15 11:13:05 +01001722 if (tn->internal[i]) {
Charles Manning753ac612012-05-09 16:55:17 +00001723 tn->internal[i] =
1724 yaffs_prune_worker(dev,
1725 tn->internal[i],
1726 level - 1,
1727 (i == 0) ? del0 : 1);
William Juul0e8cc8b2007-11-15 11:13:05 +01001728 }
Charles Manning753ac612012-05-09 16:55:17 +00001729
1730 if (tn->internal[i])
1731 has_data++;
William Juul0e8cc8b2007-11-15 11:13:05 +01001732 }
Charles Manning753ac612012-05-09 16:55:17 +00001733 } else {
1734 int tnode_size_u32 = dev->tnode_size / sizeof(u32);
1735 u32 *map = (u32 *) tn;
William Juul0e8cc8b2007-11-15 11:13:05 +01001736
Charles Manning753ac612012-05-09 16:55:17 +00001737 for (i = 0; !has_data && i < tnode_size_u32; i++) {
1738 if (map[i])
1739 has_data++;
William Juul0e8cc8b2007-11-15 11:13:05 +01001740 }
William Juul0e8cc8b2007-11-15 11:13:05 +01001741 }
1742
Charles Manning753ac612012-05-09 16:55:17 +00001743 if (has_data == 0 && del0) {
1744 /* Free and return NULL */
1745 yaffs_free_tnode(dev, tn);
1746 tn = NULL;
1747 }
William Juul0e8cc8b2007-11-15 11:13:05 +01001748 return tn;
William Juul0e8cc8b2007-11-15 11:13:05 +01001749}
1750
Charles Manning753ac612012-05-09 16:55:17 +00001751static int yaffs_prune_tree(struct yaffs_dev *dev,
1752 struct yaffs_file_var *file_struct)
William Juul0e8cc8b2007-11-15 11:13:05 +01001753{
1754 int i;
Charles Manning753ac612012-05-09 16:55:17 +00001755 int has_data;
William Juul0e8cc8b2007-11-15 11:13:05 +01001756 int done = 0;
Charles Manning753ac612012-05-09 16:55:17 +00001757 struct yaffs_tnode *tn;
William Juul0e8cc8b2007-11-15 11:13:05 +01001758
Charles Manning753ac612012-05-09 16:55:17 +00001759 if (file_struct->top_level < 1)
1760 return YAFFS_OK;
William Juul0e8cc8b2007-11-15 11:13:05 +01001761
Charles Manning753ac612012-05-09 16:55:17 +00001762 file_struct->top =
1763 yaffs_prune_worker(dev, file_struct->top, file_struct->top_level, 0);
William Juul0e8cc8b2007-11-15 11:13:05 +01001764
Charles Manning753ac612012-05-09 16:55:17 +00001765 /* Now we have a tree with all the non-zero branches NULL but
1766 * the height is the same as it was.
1767 * Let's see if we can trim internal tnodes to shorten the tree.
1768 * We can do this if only the 0th element in the tnode is in use
1769 * (ie all the non-zero are NULL)
1770 */
William Juul0e8cc8b2007-11-15 11:13:05 +01001771
Charles Manning753ac612012-05-09 16:55:17 +00001772 while (file_struct->top_level && !done) {
1773 tn = file_struct->top;
William Juul0e8cc8b2007-11-15 11:13:05 +01001774
Charles Manning753ac612012-05-09 16:55:17 +00001775 has_data = 0;
1776 for (i = 1; i < YAFFS_NTNODES_INTERNAL; i++) {
1777 if (tn->internal[i])
1778 has_data++;
1779 }
1780
1781 if (!has_data) {
1782 file_struct->top = tn->internal[0];
1783 file_struct->top_level--;
1784 yaffs_free_tnode(dev, tn);
1785 } else {
1786 done = 1;
William Juul0e8cc8b2007-11-15 11:13:05 +01001787 }
1788 }
1789
1790 return YAFFS_OK;
1791}
1792
1793/*-------------------- End of File Structure functions.-------------------*/
1794
Charles Manning753ac612012-05-09 16:55:17 +00001795/* alloc_empty_obj gets us a clean Object.*/
1796static struct yaffs_obj *yaffs_alloc_empty_obj(struct yaffs_dev *dev)
William Juul0e8cc8b2007-11-15 11:13:05 +01001797{
Charles Manning753ac612012-05-09 16:55:17 +00001798 struct yaffs_obj *obj = yaffs_alloc_raw_obj(dev);
William Juul0e8cc8b2007-11-15 11:13:05 +01001799
Charles Manning753ac612012-05-09 16:55:17 +00001800 if (!obj)
1801 return obj;
William Juul0e8cc8b2007-11-15 11:13:05 +01001802
Charles Manning753ac612012-05-09 16:55:17 +00001803 dev->n_obj++;
William Juul0e8cc8b2007-11-15 11:13:05 +01001804
Charles Manning753ac612012-05-09 16:55:17 +00001805 /* Now sweeten it up... */
1806
1807 memset(obj, 0, sizeof(struct yaffs_obj));
1808 obj->being_created = 1;
1809
1810 obj->my_dev = dev;
1811 obj->hdr_chunk = 0;
1812 obj->variant_type = YAFFS_OBJECT_TYPE_UNKNOWN;
1813 INIT_LIST_HEAD(&(obj->hard_links));
1814 INIT_LIST_HEAD(&(obj->hash_link));
1815 INIT_LIST_HEAD(&obj->siblings);
1816
1817 /* Now make the directory sane */
1818 if (dev->root_dir) {
1819 obj->parent = dev->root_dir;
1820 list_add(&(obj->siblings),
1821 &dev->root_dir->variant.dir_variant.children);
William Juul0e8cc8b2007-11-15 11:13:05 +01001822 }
Wolfgang Denk4b070802008-08-14 14:41:06 +02001823
Charles Manning753ac612012-05-09 16:55:17 +00001824 /* Add it to the lost and found directory.
1825 * NB Can't put root or lost-n-found in lost-n-found so
1826 * check if lost-n-found exists first
1827 */
1828 if (dev->lost_n_found)
1829 yaffs_add_obj_to_dir(dev->lost_n_found, obj);
William Juul0e8cc8b2007-11-15 11:13:05 +01001830
Charles Manning753ac612012-05-09 16:55:17 +00001831 obj->being_created = 0;
William Juul0e8cc8b2007-11-15 11:13:05 +01001832
Charles Manning753ac612012-05-09 16:55:17 +00001833 dev->checkpoint_blocks_required = 0; /* force recalculation */
William Juul0e8cc8b2007-11-15 11:13:05 +01001834
1835 return obj;
William Juul0e8cc8b2007-11-15 11:13:05 +01001836}
1837
Charles Manning753ac612012-05-09 16:55:17 +00001838static int yaffs_find_nice_bucket(struct yaffs_dev *dev)
William Juul0e8cc8b2007-11-15 11:13:05 +01001839{
William Juul0e8cc8b2007-11-15 11:13:05 +01001840 int i;
1841 int l = 999;
1842 int lowest = 999999;
1843
Charles Manning753ac612012-05-09 16:55:17 +00001844 /* Search for the shortest list or one that
1845 * isn't too long.
William Juul0e8cc8b2007-11-15 11:13:05 +01001846 */
1847
Charles Manning753ac612012-05-09 16:55:17 +00001848 for (i = 0; i < 10 && lowest > 4; i++) {
1849 dev->bucket_finder++;
1850 dev->bucket_finder %= YAFFS_NOBJECT_BUCKETS;
1851 if (dev->obj_bucket[dev->bucket_finder].count < lowest) {
1852 lowest = dev->obj_bucket[dev->bucket_finder].count;
1853 l = dev->bucket_finder;
William Juul0e8cc8b2007-11-15 11:13:05 +01001854 }
William Juul0e8cc8b2007-11-15 11:13:05 +01001855 }
1856
1857 return l;
1858}
1859
Charles Manning753ac612012-05-09 16:55:17 +00001860static int yaffs_new_obj_id(struct yaffs_dev *dev)
William Juul0e8cc8b2007-11-15 11:13:05 +01001861{
Charles Manning753ac612012-05-09 16:55:17 +00001862 int bucket = yaffs_find_nice_bucket(dev);
1863 int found = 0;
1864 struct list_head *i;
1865 u32 n = (u32) bucket;
William Juul0e8cc8b2007-11-15 11:13:05 +01001866
1867 /* Now find an object value that has not already been taken
1868 * by scanning the list.
1869 */
1870
William Juul0e8cc8b2007-11-15 11:13:05 +01001871 while (!found) {
1872 found = 1;
1873 n += YAFFS_NOBJECT_BUCKETS;
Heinrich Schuchardt76df2752017-11-09 01:26:43 +01001874 list_for_each(i, &dev->obj_bucket[bucket].list) {
1875 /* If there is already one in the list */
Heinrich Schuchardt428e60e2018-03-08 22:52:29 +01001876 if (list_entry(i, struct yaffs_obj,
1877 hash_link)->obj_id == n) {
Heinrich Schuchardt76df2752017-11-09 01:26:43 +01001878 found = 0;
1879 break;
William Juul0e8cc8b2007-11-15 11:13:05 +01001880 }
1881 }
1882 }
William Juul0e8cc8b2007-11-15 11:13:05 +01001883 return n;
1884}
1885
Charles Manning753ac612012-05-09 16:55:17 +00001886static void yaffs_hash_obj(struct yaffs_obj *in)
William Juul0e8cc8b2007-11-15 11:13:05 +01001887{
Charles Manning753ac612012-05-09 16:55:17 +00001888 int bucket = yaffs_hash_fn(in->obj_id);
1889 struct yaffs_dev *dev = in->my_dev;
William Juul0e8cc8b2007-11-15 11:13:05 +01001890
Charles Manning753ac612012-05-09 16:55:17 +00001891 list_add(&in->hash_link, &dev->obj_bucket[bucket].list);
1892 dev->obj_bucket[bucket].count++;
William Juul0e8cc8b2007-11-15 11:13:05 +01001893}
1894
Charles Manning753ac612012-05-09 16:55:17 +00001895struct yaffs_obj *yaffs_find_by_number(struct yaffs_dev *dev, u32 number)
William Juul0e8cc8b2007-11-15 11:13:05 +01001896{
Charles Manning753ac612012-05-09 16:55:17 +00001897 int bucket = yaffs_hash_fn(number);
William Juul0e8cc8b2007-11-15 11:13:05 +01001898 struct list_head *i;
Charles Manning753ac612012-05-09 16:55:17 +00001899 struct yaffs_obj *in;
William Juul0e8cc8b2007-11-15 11:13:05 +01001900
Charles Manning753ac612012-05-09 16:55:17 +00001901 list_for_each(i, &dev->obj_bucket[bucket].list) {
William Juul0e8cc8b2007-11-15 11:13:05 +01001902 /* Look if it is in the list */
Charles Manning753ac612012-05-09 16:55:17 +00001903 in = list_entry(i, struct yaffs_obj, hash_link);
1904 if (in->obj_id == number) {
1905 /* Don't show if it is defered free */
1906 if (in->defered_free)
1907 return NULL;
1908 return in;
William Juul0e8cc8b2007-11-15 11:13:05 +01001909 }
1910 }
1911
1912 return NULL;
1913}
1914
Charles Manning753ac612012-05-09 16:55:17 +00001915struct yaffs_obj *yaffs_new_obj(struct yaffs_dev *dev, int number,
1916 enum yaffs_obj_type type)
William Juul0e8cc8b2007-11-15 11:13:05 +01001917{
Charles Manning753ac612012-05-09 16:55:17 +00001918 struct yaffs_obj *the_obj = NULL;
1919 struct yaffs_tnode *tn = NULL;
William Juul0e8cc8b2007-11-15 11:13:05 +01001920
Charles Manning753ac612012-05-09 16:55:17 +00001921 if (number < 0)
1922 number = yaffs_new_obj_id(dev);
William Juul0e8cc8b2007-11-15 11:13:05 +01001923
Charles Manning753ac612012-05-09 16:55:17 +00001924 if (type == YAFFS_OBJECT_TYPE_FILE) {
1925 tn = yaffs_get_tnode(dev);
1926 if (!tn)
1927 return NULL;
William Juul0e8cc8b2007-11-15 11:13:05 +01001928 }
1929
Charles Manning753ac612012-05-09 16:55:17 +00001930 the_obj = yaffs_alloc_empty_obj(dev);
1931 if (!the_obj) {
1932 if (tn)
1933 yaffs_free_tnode(dev, tn);
1934 return NULL;
1935 }
1936
1937 the_obj->fake = 0;
1938 the_obj->rename_allowed = 1;
1939 the_obj->unlink_allowed = 1;
1940 the_obj->obj_id = number;
1941 yaffs_hash_obj(the_obj);
1942 the_obj->variant_type = type;
1943 yaffs_load_current_time(the_obj, 1, 1);
1944
1945 switch (type) {
1946 case YAFFS_OBJECT_TYPE_FILE:
1947 the_obj->variant.file_variant.file_size = 0;
1948 the_obj->variant.file_variant.scanned_size = 0;
1949 the_obj->variant.file_variant.shrink_size =
1950 yaffs_max_file_size(dev);
1951 the_obj->variant.file_variant.top_level = 0;
1952 the_obj->variant.file_variant.top = tn;
1953 break;
1954 case YAFFS_OBJECT_TYPE_DIRECTORY:
1955 INIT_LIST_HEAD(&the_obj->variant.dir_variant.children);
1956 INIT_LIST_HEAD(&the_obj->variant.dir_variant.dirty);
1957 break;
1958 case YAFFS_OBJECT_TYPE_SYMLINK:
1959 case YAFFS_OBJECT_TYPE_HARDLINK:
1960 case YAFFS_OBJECT_TYPE_SPECIAL:
1961 /* No action required */
1962 break;
1963 case YAFFS_OBJECT_TYPE_UNKNOWN:
1964 /* todo this should not happen */
1965 break;
1966 }
1967 return the_obj;
1968}
1969
1970static struct yaffs_obj *yaffs_create_fake_dir(struct yaffs_dev *dev,
1971 int number, u32 mode)
1972{
1973
1974 struct yaffs_obj *obj =
1975 yaffs_new_obj(dev, number, YAFFS_OBJECT_TYPE_DIRECTORY);
1976
1977 if (!obj)
William Juul0e8cc8b2007-11-15 11:13:05 +01001978 return NULL;
Wolfgang Denk4b070802008-08-14 14:41:06 +02001979
Charles Manning753ac612012-05-09 16:55:17 +00001980 obj->fake = 1; /* it is fake so it might not use NAND */
1981 obj->rename_allowed = 0;
1982 obj->unlink_allowed = 0;
1983 obj->deleted = 0;
1984 obj->unlinked = 0;
1985 obj->yst_mode = mode;
1986 obj->my_dev = dev;
1987 obj->hdr_chunk = 0; /* Not a valid chunk. */
1988 return obj;
William Juul0e8cc8b2007-11-15 11:13:05 +01001989
1990}
Wolfgang Denk4b070802008-08-14 14:41:06 +02001991
William Juul0e8cc8b2007-11-15 11:13:05 +01001992
Charles Manning753ac612012-05-09 16:55:17 +00001993static void yaffs_init_tnodes_and_objs(struct yaffs_dev *dev)
William Juul0e8cc8b2007-11-15 11:13:05 +01001994{
Charles Manning753ac612012-05-09 16:55:17 +00001995 int i;
William Juul0e8cc8b2007-11-15 11:13:05 +01001996
Charles Manning753ac612012-05-09 16:55:17 +00001997 dev->n_obj = 0;
1998 dev->n_tnodes = 0;
1999 yaffs_init_raw_tnodes_and_objs(dev);
2000
2001 for (i = 0; i < YAFFS_NOBJECT_BUCKETS; i++) {
2002 INIT_LIST_HEAD(&dev->obj_bucket[i].list);
2003 dev->obj_bucket[i].count = 0;
William Juul0e8cc8b2007-11-15 11:13:05 +01002004 }
Charles Manning753ac612012-05-09 16:55:17 +00002005}
William Juul0e8cc8b2007-11-15 11:13:05 +01002006
Charles Manning753ac612012-05-09 16:55:17 +00002007struct yaffs_obj *yaffs_find_or_create_by_number(struct yaffs_dev *dev,
2008 int number,
2009 enum yaffs_obj_type type)
2010{
2011 struct yaffs_obj *the_obj = NULL;
William Juul0e8cc8b2007-11-15 11:13:05 +01002012
Charles Manning753ac612012-05-09 16:55:17 +00002013 if (number > 0)
2014 the_obj = yaffs_find_by_number(dev, number);
2015
2016 if (!the_obj)
2017 the_obj = yaffs_new_obj(dev, number, type);
2018
2019 return the_obj;
2020
2021}
2022
2023YCHAR *yaffs_clone_str(const YCHAR *str)
2024{
2025 YCHAR *new_str = NULL;
2026 int len;
2027
2028 if (!str)
2029 str = _Y("");
2030
2031 len = yaffs_strnlen(str, YAFFS_MAX_ALIAS_LENGTH);
2032 new_str = kmalloc((len + 1) * sizeof(YCHAR), GFP_NOFS);
2033 if (new_str) {
2034 yaffs_strncpy(new_str, str, len);
2035 new_str[len] = 0;
2036 }
2037 return new_str;
2038
2039}
2040/*
2041 *yaffs_update_parent() handles fixing a directories mtime and ctime when a new
2042 * link (ie. name) is created or deleted in the directory.
2043 *
2044 * ie.
2045 * create dir/a : update dir's mtime/ctime
2046 * rm dir/a: update dir's mtime/ctime
2047 * modify dir/a: don't update dir's mtimme/ctime
2048 *
2049 * This can be handled immediately or defered. Defering helps reduce the number
2050 * of updates when many files in a directory are changed within a brief period.
2051 *
2052 * If the directory updating is defered then yaffs_update_dirty_dirs must be
2053 * called periodically.
2054 */
2055
2056static void yaffs_update_parent(struct yaffs_obj *obj)
2057{
2058 struct yaffs_dev *dev;
2059
2060 if (!obj)
2061 return;
2062 dev = obj->my_dev;
2063 obj->dirty = 1;
2064 yaffs_load_current_time(obj, 0, 1);
2065 if (dev->param.defered_dir_update) {
2066 struct list_head *link = &obj->variant.dir_variant.dirty;
2067
2068 if (list_empty(link)) {
2069 list_add(link, &dev->dirty_dirs);
2070 yaffs_trace(YAFFS_TRACE_BACKGROUND,
2071 "Added object %d to dirty directories",
2072 obj->obj_id);
2073 }
2074
2075 } else {
2076 yaffs_update_oh(obj, NULL, 0, 0, 0, NULL);
2077 }
2078}
2079
2080void yaffs_update_dirty_dirs(struct yaffs_dev *dev)
2081{
2082 struct list_head *link;
2083 struct yaffs_obj *obj;
2084 struct yaffs_dir_var *d_s;
2085 union yaffs_obj_var *o_v;
2086
2087 yaffs_trace(YAFFS_TRACE_BACKGROUND, "Update dirty directories");
2088
2089 while (!list_empty(&dev->dirty_dirs)) {
2090 link = dev->dirty_dirs.next;
2091 list_del_init(link);
2092
2093 d_s = list_entry(link, struct yaffs_dir_var, dirty);
2094 o_v = list_entry(d_s, union yaffs_obj_var, dir_variant);
2095 obj = list_entry(o_v, struct yaffs_obj, variant);
2096
2097 yaffs_trace(YAFFS_TRACE_BACKGROUND, "Update directory %d",
2098 obj->obj_id);
2099
2100 if (obj->dirty)
2101 yaffs_update_oh(obj, NULL, 0, 0, 0, NULL);
2102 }
William Juul0e8cc8b2007-11-15 11:13:05 +01002103}
2104
2105/*
2106 * Mknod (create) a new object.
Charles Manning753ac612012-05-09 16:55:17 +00002107 * equiv_obj only has meaning for a hard link;
2108 * alias_str only has meaning for a symlink.
William Juul0e8cc8b2007-11-15 11:13:05 +01002109 * rdev only has meaning for devices (a subset of special objects)
2110 */
Wolfgang Denk4b070802008-08-14 14:41:06 +02002111
Charles Manning753ac612012-05-09 16:55:17 +00002112static struct yaffs_obj *yaffs_create_obj(enum yaffs_obj_type type,
2113 struct yaffs_obj *parent,
2114 const YCHAR *name,
2115 u32 mode,
2116 u32 uid,
2117 u32 gid,
2118 struct yaffs_obj *equiv_obj,
2119 const YCHAR *alias_str, u32 rdev)
William Juul0e8cc8b2007-11-15 11:13:05 +01002120{
Charles Manning753ac612012-05-09 16:55:17 +00002121 struct yaffs_obj *in;
Wolfgang Denk068d6f92011-09-08 02:10:22 +00002122 YCHAR *str = NULL;
Charles Manning753ac612012-05-09 16:55:17 +00002123 struct yaffs_dev *dev = parent->my_dev;
William Juul0e8cc8b2007-11-15 11:13:05 +01002124
Charles Manning753ac612012-05-09 16:55:17 +00002125 /* Check if the entry exists.
2126 * If it does then fail the call since we don't want a dup. */
2127 if (yaffs_find_by_name(parent, name))
2128 return NULL;
William Juul0e8cc8b2007-11-15 11:13:05 +01002129
Charles Manning753ac612012-05-09 16:55:17 +00002130 if (type == YAFFS_OBJECT_TYPE_SYMLINK) {
2131 str = yaffs_clone_str(alias_str);
2132 if (!str)
2133 return NULL;
2134 }
2135
2136 in = yaffs_new_obj(dev, -1, type);
2137
2138 if (!in) {
2139 kfree(str);
William Juul0e8cc8b2007-11-15 11:13:05 +01002140 return NULL;
2141 }
2142
Charles Manning753ac612012-05-09 16:55:17 +00002143 in->hdr_chunk = 0;
2144 in->valid = 1;
2145 in->variant_type = type;
Wolfgang Denk4b070802008-08-14 14:41:06 +02002146
Charles Manning753ac612012-05-09 16:55:17 +00002147 in->yst_mode = mode;
2148
2149 yaffs_attribs_init(in, gid, uid, rdev);
2150
2151 in->n_data_chunks = 0;
2152
2153 yaffs_set_obj_name(in, name);
2154 in->dirty = 1;
2155
2156 yaffs_add_obj_to_dir(parent, in);
2157
2158 in->my_dev = parent->my_dev;
2159
2160 switch (type) {
2161 case YAFFS_OBJECT_TYPE_SYMLINK:
2162 in->variant.symlink_variant.alias = str;
2163 break;
2164 case YAFFS_OBJECT_TYPE_HARDLINK:
2165 in->variant.hardlink_variant.equiv_obj = equiv_obj;
2166 in->variant.hardlink_variant.equiv_id = equiv_obj->obj_id;
2167 list_add(&in->hard_links, &equiv_obj->hard_links);
2168 break;
2169 case YAFFS_OBJECT_TYPE_FILE:
2170 case YAFFS_OBJECT_TYPE_DIRECTORY:
2171 case YAFFS_OBJECT_TYPE_SPECIAL:
2172 case YAFFS_OBJECT_TYPE_UNKNOWN:
2173 /* do nothing */
2174 break;
William Juul0e8cc8b2007-11-15 11:13:05 +01002175 }
Wolfgang Denk4b070802008-08-14 14:41:06 +02002176
Charles Manning753ac612012-05-09 16:55:17 +00002177 if (yaffs_update_oh(in, name, 0, 0, 0, NULL) < 0) {
2178 /* Could not create the object header, fail */
2179 yaffs_del_obj(in);
2180 in = NULL;
William Juul0e8cc8b2007-11-15 11:13:05 +01002181 }
2182
Charles Manning753ac612012-05-09 16:55:17 +00002183 if (in)
2184 yaffs_update_parent(parent);
2185
William Juul0e8cc8b2007-11-15 11:13:05 +01002186 return in;
2187}
2188
Charles Manning753ac612012-05-09 16:55:17 +00002189struct yaffs_obj *yaffs_create_file(struct yaffs_obj *parent,
2190 const YCHAR *name, u32 mode, u32 uid,
2191 u32 gid)
William Juul0e8cc8b2007-11-15 11:13:05 +01002192{
Charles Manning753ac612012-05-09 16:55:17 +00002193 return yaffs_create_obj(YAFFS_OBJECT_TYPE_FILE, parent, name, mode,
2194 uid, gid, NULL, NULL, 0);
William Juul0e8cc8b2007-11-15 11:13:05 +01002195}
2196
Charles Manning753ac612012-05-09 16:55:17 +00002197struct yaffs_obj *yaffs_create_dir(struct yaffs_obj *parent, const YCHAR *name,
2198 u32 mode, u32 uid, u32 gid)
William Juul0e8cc8b2007-11-15 11:13:05 +01002199{
Charles Manning753ac612012-05-09 16:55:17 +00002200 return yaffs_create_obj(YAFFS_OBJECT_TYPE_DIRECTORY, parent, name,
2201 mode, uid, gid, NULL, NULL, 0);
William Juul0e8cc8b2007-11-15 11:13:05 +01002202}
2203
Charles Manning753ac612012-05-09 16:55:17 +00002204struct yaffs_obj *yaffs_create_special(struct yaffs_obj *parent,
2205 const YCHAR *name, u32 mode, u32 uid,
2206 u32 gid, u32 rdev)
William Juul0e8cc8b2007-11-15 11:13:05 +01002207{
Charles Manning753ac612012-05-09 16:55:17 +00002208 return yaffs_create_obj(YAFFS_OBJECT_TYPE_SPECIAL, parent, name, mode,
2209 uid, gid, NULL, NULL, rdev);
William Juul0e8cc8b2007-11-15 11:13:05 +01002210}
2211
Charles Manning753ac612012-05-09 16:55:17 +00002212struct yaffs_obj *yaffs_create_symlink(struct yaffs_obj *parent,
2213 const YCHAR *name, u32 mode, u32 uid,
2214 u32 gid, const YCHAR *alias)
William Juul0e8cc8b2007-11-15 11:13:05 +01002215{
Charles Manning753ac612012-05-09 16:55:17 +00002216 return yaffs_create_obj(YAFFS_OBJECT_TYPE_SYMLINK, parent, name, mode,
2217 uid, gid, NULL, alias, 0);
William Juul0e8cc8b2007-11-15 11:13:05 +01002218}
2219
Charles Manning753ac612012-05-09 16:55:17 +00002220/* yaffs_link_obj returns the object id of the equivalent object.*/
2221struct yaffs_obj *yaffs_link_obj(struct yaffs_obj *parent, const YCHAR * name,
2222 struct yaffs_obj *equiv_obj)
William Juul0e8cc8b2007-11-15 11:13:05 +01002223{
Charles Manning753ac612012-05-09 16:55:17 +00002224 /* Get the real object in case we were fed a hard link obj */
2225 equiv_obj = yaffs_get_equivalent_obj(equiv_obj);
William Juul0e8cc8b2007-11-15 11:13:05 +01002226
Charles Manning753ac612012-05-09 16:55:17 +00002227 if (yaffs_create_obj(YAFFS_OBJECT_TYPE_HARDLINK,
2228 parent, name, 0, 0, 0,
2229 equiv_obj, NULL, 0))
2230 return equiv_obj;
2231
2232 return NULL;
William Juul0e8cc8b2007-11-15 11:13:05 +01002233
2234}
2235
Charles Manning753ac612012-05-09 16:55:17 +00002236
2237
2238/*---------------------- Block Management and Page Allocation -------------*/
2239
2240static void yaffs_deinit_blocks(struct yaffs_dev *dev)
William Juul0e8cc8b2007-11-15 11:13:05 +01002241{
Charles Manning753ac612012-05-09 16:55:17 +00002242 if (dev->block_info_alt && dev->block_info)
2243 vfree(dev->block_info);
2244 else
2245 kfree(dev->block_info);
William Juul0e8cc8b2007-11-15 11:13:05 +01002246
Charles Manning753ac612012-05-09 16:55:17 +00002247 dev->block_info_alt = 0;
William Juul0e8cc8b2007-11-15 11:13:05 +01002248
Charles Manning753ac612012-05-09 16:55:17 +00002249 dev->block_info = NULL;
William Juul0e8cc8b2007-11-15 11:13:05 +01002250
Charles Manning753ac612012-05-09 16:55:17 +00002251 if (dev->chunk_bits_alt && dev->chunk_bits)
2252 vfree(dev->chunk_bits);
2253 else
2254 kfree(dev->chunk_bits);
2255 dev->chunk_bits_alt = 0;
2256 dev->chunk_bits = NULL;
William Juul0e8cc8b2007-11-15 11:13:05 +01002257}
2258
Charles Manning753ac612012-05-09 16:55:17 +00002259static int yaffs_init_blocks(struct yaffs_dev *dev)
William Juul0e8cc8b2007-11-15 11:13:05 +01002260{
Charles Manning753ac612012-05-09 16:55:17 +00002261 int n_blocks = dev->internal_end_block - dev->internal_start_block + 1;
William Juul0e8cc8b2007-11-15 11:13:05 +01002262
Charles Manning753ac612012-05-09 16:55:17 +00002263 dev->block_info = NULL;
2264 dev->chunk_bits = NULL;
2265 dev->alloc_block = -1; /* force it to get a new one */
William Juul0e8cc8b2007-11-15 11:13:05 +01002266
2267 /* If the first allocation strategy fails, thry the alternate one */
Charles Manning753ac612012-05-09 16:55:17 +00002268 dev->block_info =
2269 kmalloc(n_blocks * sizeof(struct yaffs_block_info), GFP_NOFS);
2270 if (!dev->block_info) {
2271 dev->block_info =
2272 vmalloc(n_blocks * sizeof(struct yaffs_block_info));
2273 dev->block_info_alt = 1;
William Juul0e8cc8b2007-11-15 11:13:05 +01002274 } else {
Charles Manning753ac612012-05-09 16:55:17 +00002275 dev->block_info_alt = 0;
William Juul0e8cc8b2007-11-15 11:13:05 +01002276 }
2277
Charles Manning753ac612012-05-09 16:55:17 +00002278 if (!dev->block_info)
2279 goto alloc_error;
William Juul0e8cc8b2007-11-15 11:13:05 +01002280
Charles Manning753ac612012-05-09 16:55:17 +00002281 /* Set up dynamic blockinfo stuff. Round up bytes. */
2282 dev->chunk_bit_stride = (dev->param.chunks_per_block + 7) / 8;
2283 dev->chunk_bits =
2284 kmalloc(dev->chunk_bit_stride * n_blocks, GFP_NOFS);
2285 if (!dev->chunk_bits) {
2286 dev->chunk_bits =
2287 vmalloc(dev->chunk_bit_stride * n_blocks);
2288 dev->chunk_bits_alt = 1;
2289 } else {
2290 dev->chunk_bits_alt = 0;
William Juul0e8cc8b2007-11-15 11:13:05 +01002291 }
Charles Manning753ac612012-05-09 16:55:17 +00002292 if (!dev->chunk_bits)
2293 goto alloc_error;
William Juul0e8cc8b2007-11-15 11:13:05 +01002294
William Juul0e8cc8b2007-11-15 11:13:05 +01002295
Charles Manning753ac612012-05-09 16:55:17 +00002296 memset(dev->block_info, 0, n_blocks * sizeof(struct yaffs_block_info));
2297 memset(dev->chunk_bits, 0, dev->chunk_bit_stride * n_blocks);
2298 return YAFFS_OK;
William Juul0e8cc8b2007-11-15 11:13:05 +01002299
Charles Manning753ac612012-05-09 16:55:17 +00002300alloc_error:
2301 yaffs_deinit_blocks(dev);
2302 return YAFFS_FAIL;
William Juul0e8cc8b2007-11-15 11:13:05 +01002303}
2304
William Juul0e8cc8b2007-11-15 11:13:05 +01002305
Charles Manning753ac612012-05-09 16:55:17 +00002306void yaffs_block_became_dirty(struct yaffs_dev *dev, int block_no)
2307{
2308 struct yaffs_block_info *bi = yaffs_get_block_info(dev, block_no);
2309 int erased_ok = 0;
2310 int i;
William Juul0e8cc8b2007-11-15 11:13:05 +01002311
2312 /* If the block is still healthy erase it and mark as clean.
2313 * If the block has had a data failure, then retire it.
2314 */
Wolfgang Denk4b070802008-08-14 14:41:06 +02002315
Charles Manning753ac612012-05-09 16:55:17 +00002316 yaffs_trace(YAFFS_TRACE_GC | YAFFS_TRACE_ERASE,
2317 "yaffs_block_became_dirty block %d state %d %s",
2318 block_no, bi->block_state,
2319 (bi->needs_retiring) ? "needs retiring" : "");
Wolfgang Denk4b070802008-08-14 14:41:06 +02002320
Charles Manning753ac612012-05-09 16:55:17 +00002321 yaffs2_clear_oldest_dirty_seq(dev, bi);
William Juul0e8cc8b2007-11-15 11:13:05 +01002322
Charles Manning753ac612012-05-09 16:55:17 +00002323 bi->block_state = YAFFS_BLOCK_STATE_DIRTY;
2324
2325 /* If this is the block being garbage collected then stop gc'ing */
2326 if (block_no == dev->gc_block)
2327 dev->gc_block = 0;
2328
2329 /* If this block is currently the best candidate for gc
2330 * then drop as a candidate */
2331 if (block_no == dev->gc_dirtiest) {
2332 dev->gc_dirtiest = 0;
2333 dev->gc_pages_in_use = 0;
2334 }
2335
2336 if (!bi->needs_retiring) {
2337 yaffs2_checkpt_invalidate(dev);
2338 erased_ok = yaffs_erase_block(dev, block_no);
2339 if (!erased_ok) {
2340 dev->n_erase_failures++;
2341 yaffs_trace(YAFFS_TRACE_ERROR | YAFFS_TRACE_BAD_BLOCKS,
2342 "**>> Erasure failed %d", block_no);
William Juul0e8cc8b2007-11-15 11:13:05 +01002343 }
2344 }
2345
Charles Manning753ac612012-05-09 16:55:17 +00002346 /* Verify erasure if needed */
2347 if (erased_ok &&
2348 ((yaffs_trace_mask & YAFFS_TRACE_ERASE) ||
2349 !yaffs_skip_verification(dev))) {
2350 for (i = 0; i < dev->param.chunks_per_block; i++) {
2351 if (!yaffs_check_chunk_erased(dev,
2352 block_no * dev->param.chunks_per_block + i)) {
2353 yaffs_trace(YAFFS_TRACE_ERROR,
2354 ">>Block %d erasure supposedly OK, but chunk %d not erased",
2355 block_no, i);
William Juul0e8cc8b2007-11-15 11:13:05 +01002356 }
2357 }
2358 }
2359
Charles Manning753ac612012-05-09 16:55:17 +00002360 if (!erased_ok) {
2361 /* We lost a block of free space */
2362 dev->n_free_chunks -= dev->param.chunks_per_block;
2363 yaffs_retire_block(dev, block_no);
2364 yaffs_trace(YAFFS_TRACE_ERROR | YAFFS_TRACE_BAD_BLOCKS,
2365 "**>> Block %d retired", block_no);
2366 return;
William Juul0e8cc8b2007-11-15 11:13:05 +01002367 }
Charles Manning753ac612012-05-09 16:55:17 +00002368
2369 /* Clean it up... */
2370 bi->block_state = YAFFS_BLOCK_STATE_EMPTY;
2371 bi->seq_number = 0;
2372 dev->n_erased_blocks++;
2373 bi->pages_in_use = 0;
2374 bi->soft_del_pages = 0;
2375 bi->has_shrink_hdr = 0;
2376 bi->skip_erased_check = 1; /* Clean, so no need to check */
2377 bi->gc_prioritise = 0;
2378 bi->has_summary = 0;
2379
2380 yaffs_clear_chunk_bits(dev, block_no);
2381
2382 yaffs_trace(YAFFS_TRACE_ERASE, "Erased block %d", block_no);
William Juul0e8cc8b2007-11-15 11:13:05 +01002383}
2384
Charles Manning753ac612012-05-09 16:55:17 +00002385static inline int yaffs_gc_process_chunk(struct yaffs_dev *dev,
2386 struct yaffs_block_info *bi,
2387 int old_chunk, u8 *buffer)
William Juul0e8cc8b2007-11-15 11:13:05 +01002388{
Charles Manning753ac612012-05-09 16:55:17 +00002389 int new_chunk;
2390 int mark_flash = 1;
2391 struct yaffs_ext_tags tags;
2392 struct yaffs_obj *object;
2393 int matching_chunk;
2394 int ret_val = YAFFS_OK;
William Juul0e8cc8b2007-11-15 11:13:05 +01002395
Charles Manning753ac612012-05-09 16:55:17 +00002396 memset(&tags, 0, sizeof(tags));
2397 yaffs_rd_chunk_tags_nand(dev, old_chunk,
2398 buffer, &tags);
2399 object = yaffs_find_by_number(dev, tags.obj_id);
William Juul0e8cc8b2007-11-15 11:13:05 +01002400
Charles Manning753ac612012-05-09 16:55:17 +00002401 yaffs_trace(YAFFS_TRACE_GC_DETAIL,
2402 "Collecting chunk in block %d, %d %d %d ",
2403 dev->gc_chunk, tags.obj_id,
2404 tags.chunk_id, tags.n_bytes);
2405
2406 if (object && !yaffs_skip_verification(dev)) {
2407 if (tags.chunk_id == 0)
2408 matching_chunk =
2409 object->hdr_chunk;
2410 else if (object->soft_del)
2411 /* Defeat the test */
2412 matching_chunk = old_chunk;
2413 else
2414 matching_chunk =
2415 yaffs_find_chunk_in_file
2416 (object, tags.chunk_id,
2417 NULL);
2418
2419 if (old_chunk != matching_chunk)
2420 yaffs_trace(YAFFS_TRACE_ERROR,
2421 "gc: page in gc mismatch: %d %d %d %d",
2422 old_chunk,
2423 matching_chunk,
2424 tags.obj_id,
2425 tags.chunk_id);
2426 }
2427
2428 if (!object) {
2429 yaffs_trace(YAFFS_TRACE_ERROR,
2430 "page %d in gc has no object: %d %d %d ",
2431 old_chunk,
2432 tags.obj_id, tags.chunk_id,
2433 tags.n_bytes);
2434 }
2435
2436 if (object &&
2437 object->deleted &&
2438 object->soft_del && tags.chunk_id != 0) {
2439 /* Data chunk in a soft deleted file,
2440 * throw it away.
2441 * It's a soft deleted data chunk,
2442 * No need to copy this, just forget
2443 * about it and fix up the object.
William Juul0e8cc8b2007-11-15 11:13:05 +01002444 */
William Juul0e8cc8b2007-11-15 11:13:05 +01002445
Charles Manning753ac612012-05-09 16:55:17 +00002446 /* Free chunks already includes
2447 * softdeleted chunks, how ever this
2448 * chunk is going to soon be really
2449 * deleted which will increment free
2450 * chunks. We have to decrement free
2451 * chunks so this works out properly.
2452 */
2453 dev->n_free_chunks--;
2454 bi->soft_del_pages--;
Wolfgang Denk4b070802008-08-14 14:41:06 +02002455
Charles Manning753ac612012-05-09 16:55:17 +00002456 object->n_data_chunks--;
2457 if (object->n_data_chunks <= 0) {
2458 /* remeber to clean up obj */
2459 dev->gc_cleanup_list[dev->n_clean_ups] = tags.obj_id;
2460 dev->n_clean_ups++;
2461 }
2462 mark_flash = 0;
2463 } else if (object) {
2464 /* It's either a data chunk in a live
2465 * file or an ObjectHeader, so we're
2466 * interested in it.
2467 * NB Need to keep the ObjectHeaders of
2468 * deleted files until the whole file
2469 * has been deleted off
2470 */
2471 tags.serial_number++;
2472 dev->n_gc_copies++;
William Juul0e8cc8b2007-11-15 11:13:05 +01002473
Charles Manning753ac612012-05-09 16:55:17 +00002474 if (tags.chunk_id == 0) {
2475 /* It is an object Id,
2476 * We need to nuke the
2477 * shrinkheader flags since its
2478 * work is done.
2479 * Also need to clean up
2480 * shadowing.
2481 */
2482 struct yaffs_obj_hdr *oh;
2483 oh = (struct yaffs_obj_hdr *) buffer;
2484
2485 oh->is_shrink = 0;
2486 tags.extra_is_shrink = 0;
2487 oh->shadows_obj = 0;
2488 oh->inband_shadowed_obj_id = 0;
2489 tags.extra_shadows = 0;
2490
2491 /* Update file size */
2492 if (object->variant_type == YAFFS_OBJECT_TYPE_FILE) {
2493 yaffs_oh_size_load(oh,
2494 object->variant.file_variant.file_size);
2495 tags.extra_file_size =
2496 object->variant.file_variant.file_size;
2497 }
2498
2499 yaffs_verify_oh(object, oh, &tags, 1);
2500 new_chunk =
2501 yaffs_write_new_chunk(dev, (u8 *) oh, &tags, 1);
2502 } else {
2503 new_chunk =
2504 yaffs_write_new_chunk(dev, buffer, &tags, 1);
William Juul0e8cc8b2007-11-15 11:13:05 +01002505 }
2506
Charles Manning753ac612012-05-09 16:55:17 +00002507 if (new_chunk < 0) {
2508 ret_val = YAFFS_FAIL;
2509 } else {
William Juul0e8cc8b2007-11-15 11:13:05 +01002510
Charles Manning753ac612012-05-09 16:55:17 +00002511 /* Now fix up the Tnodes etc. */
2512
2513 if (tags.chunk_id == 0) {
2514 /* It's a header */
2515 object->hdr_chunk = new_chunk;
2516 object->serial = tags.serial_number;
2517 } else {
2518 /* It's a data chunk */
2519 yaffs_put_chunk_in_file(object, tags.chunk_id,
2520 new_chunk, 0);
2521 }
William Juul0e8cc8b2007-11-15 11:13:05 +01002522 }
2523 }
Charles Manning753ac612012-05-09 16:55:17 +00002524 if (ret_val == YAFFS_OK)
2525 yaffs_chunk_del(dev, old_chunk, mark_flash, __LINE__);
2526 return ret_val;
William Juul0e8cc8b2007-11-15 11:13:05 +01002527}
2528
Charles Manning753ac612012-05-09 16:55:17 +00002529static int yaffs_gc_block(struct yaffs_dev *dev, int block, int whole_block)
William Juul0e8cc8b2007-11-15 11:13:05 +01002530{
Charles Manning753ac612012-05-09 16:55:17 +00002531 int old_chunk;
2532 int ret_val = YAFFS_OK;
William Juul0e8cc8b2007-11-15 11:13:05 +01002533 int i;
Charles Manning753ac612012-05-09 16:55:17 +00002534 int is_checkpt_block;
2535 int max_copies;
2536 int chunks_before = yaffs_get_erased_chunks(dev);
2537 int chunks_after;
2538 struct yaffs_block_info *bi = yaffs_get_block_info(dev, block);
William Juul0e8cc8b2007-11-15 11:13:05 +01002539
Charles Manning753ac612012-05-09 16:55:17 +00002540 is_checkpt_block = (bi->block_state == YAFFS_BLOCK_STATE_CHECKPOINT);
William Juul0e8cc8b2007-11-15 11:13:05 +01002541
Charles Manning753ac612012-05-09 16:55:17 +00002542 yaffs_trace(YAFFS_TRACE_TRACING,
2543 "Collecting block %d, in use %d, shrink %d, whole_block %d",
2544 block, bi->pages_in_use, bi->has_shrink_hdr,
2545 whole_block);
William Juul0e8cc8b2007-11-15 11:13:05 +01002546
Charles Manning753ac612012-05-09 16:55:17 +00002547 /*yaffs_verify_free_chunks(dev); */
William Juul0e8cc8b2007-11-15 11:13:05 +01002548
Charles Manning753ac612012-05-09 16:55:17 +00002549 if (bi->block_state == YAFFS_BLOCK_STATE_FULL)
2550 bi->block_state = YAFFS_BLOCK_STATE_COLLECTING;
William Juul0e8cc8b2007-11-15 11:13:05 +01002551
Charles Manning753ac612012-05-09 16:55:17 +00002552 bi->has_shrink_hdr = 0; /* clear the flag so that the block can erase */
Wolfgang Denk4b070802008-08-14 14:41:06 +02002553
Charles Manning753ac612012-05-09 16:55:17 +00002554 dev->gc_disable = 1;
William Juul0e8cc8b2007-11-15 11:13:05 +01002555
Charles Manning753ac612012-05-09 16:55:17 +00002556 yaffs_summary_gc(dev, block);
William Juul0e8cc8b2007-11-15 11:13:05 +01002557
Charles Manning753ac612012-05-09 16:55:17 +00002558 if (is_checkpt_block || !yaffs_still_some_chunks(dev, block)) {
2559 yaffs_trace(YAFFS_TRACE_TRACING,
2560 "Collecting block %d that has no chunks in use",
2561 block);
2562 yaffs_block_became_dirty(dev, block);
William Juul0e8cc8b2007-11-15 11:13:05 +01002563 } else {
2564
Charles Manning753ac612012-05-09 16:55:17 +00002565 u8 *buffer = yaffs_get_temp_buffer(dev);
Wolfgang Denk4b070802008-08-14 14:41:06 +02002566
Charles Manning753ac612012-05-09 16:55:17 +00002567 yaffs_verify_blk(dev, bi, block);
William Juul0e8cc8b2007-11-15 11:13:05 +01002568
Charles Manning753ac612012-05-09 16:55:17 +00002569 max_copies = (whole_block) ? dev->param.chunks_per_block : 5;
2570 old_chunk = block * dev->param.chunks_per_block + dev->gc_chunk;
William Juul0e8cc8b2007-11-15 11:13:05 +01002571
Charles Manning753ac612012-05-09 16:55:17 +00002572 for (/* init already done */ ;
2573 ret_val == YAFFS_OK &&
2574 dev->gc_chunk < dev->param.chunks_per_block &&
2575 (bi->block_state == YAFFS_BLOCK_STATE_COLLECTING) &&
2576 max_copies > 0;
2577 dev->gc_chunk++, old_chunk++) {
2578 if (yaffs_check_chunk_bit(dev, block, dev->gc_chunk)) {
2579 /* Page is in use and might need to be copied */
2580 max_copies--;
2581 ret_val = yaffs_gc_process_chunk(dev, bi,
2582 old_chunk, buffer);
William Juul0e8cc8b2007-11-15 11:13:05 +01002583 }
2584 }
Charles Manning753ac612012-05-09 16:55:17 +00002585 yaffs_release_temp_buffer(dev, buffer);
2586 }
William Juul0e8cc8b2007-11-15 11:13:05 +01002587
Charles Manning753ac612012-05-09 16:55:17 +00002588 yaffs_verify_collected_blk(dev, bi, block);
William Juul0e8cc8b2007-11-15 11:13:05 +01002589
Charles Manning753ac612012-05-09 16:55:17 +00002590 if (bi->block_state == YAFFS_BLOCK_STATE_COLLECTING) {
2591 /*
2592 * The gc did not complete. Set block state back to FULL
2593 * because checkpointing does not restore gc.
2594 */
2595 bi->block_state = YAFFS_BLOCK_STATE_FULL;
2596 } else {
2597 /* The gc completed. */
William Juul0e8cc8b2007-11-15 11:13:05 +01002598 /* Do any required cleanups */
Charles Manning753ac612012-05-09 16:55:17 +00002599 for (i = 0; i < dev->n_clean_ups; i++) {
William Juul0e8cc8b2007-11-15 11:13:05 +01002600 /* Time to delete the file too */
Charles Manning753ac612012-05-09 16:55:17 +00002601 struct yaffs_obj *object =
2602 yaffs_find_by_number(dev, dev->gc_cleanup_list[i]);
William Juul0e8cc8b2007-11-15 11:13:05 +01002603 if (object) {
Charles Manning753ac612012-05-09 16:55:17 +00002604 yaffs_free_tnode(dev,
2605 object->variant.file_variant.top);
2606 object->variant.file_variant.top = NULL;
2607 yaffs_trace(YAFFS_TRACE_GC,
2608 "yaffs: About to finally delete object %d",
2609 object->obj_id);
2610 yaffs_generic_obj_del(object);
2611 object->my_dev->n_deleted_files--;
William Juul0e8cc8b2007-11-15 11:13:05 +01002612 }
2613
2614 }
Charles Manning753ac612012-05-09 16:55:17 +00002615 chunks_after = yaffs_get_erased_chunks(dev);
2616 if (chunks_before >= chunks_after)
2617 yaffs_trace(YAFFS_TRACE_GC,
2618 "gc did not increase free chunks before %d after %d",
2619 chunks_before, chunks_after);
2620 dev->gc_block = 0;
2621 dev->gc_chunk = 0;
2622 dev->n_clean_ups = 0;
William Juul0e8cc8b2007-11-15 11:13:05 +01002623 }
2624
Charles Manning753ac612012-05-09 16:55:17 +00002625 dev->gc_disable = 0;
Wolfgang Denk4b070802008-08-14 14:41:06 +02002626
Charles Manning753ac612012-05-09 16:55:17 +00002627 return ret_val;
2628}
2629
2630/*
2631 * find_gc_block() selects the dirtiest block (or close enough)
2632 * for garbage collection.
2633 */
2634
2635static unsigned yaffs_find_gc_block(struct yaffs_dev *dev,
2636 int aggressive, int background)
2637{
2638 int i;
2639 int iterations;
2640 unsigned selected = 0;
2641 int prioritised = 0;
2642 int prioritised_exist = 0;
2643 struct yaffs_block_info *bi;
2644 int threshold;
2645
2646 /* First let's see if we need to grab a prioritised block */
2647 if (dev->has_pending_prioritised_gc && !aggressive) {
2648 dev->gc_dirtiest = 0;
2649 bi = dev->block_info;
2650 for (i = dev->internal_start_block;
2651 i <= dev->internal_end_block && !selected; i++) {
2652
2653 if (bi->gc_prioritise) {
2654 prioritised_exist = 1;
2655 if (bi->block_state == YAFFS_BLOCK_STATE_FULL &&
2656 yaffs_block_ok_for_gc(dev, bi)) {
2657 selected = i;
2658 prioritised = 1;
2659 }
2660 }
2661 bi++;
2662 }
2663
2664 /*
2665 * If there is a prioritised block and none was selected then
2666 * this happened because there is at least one old dirty block
2667 * gumming up the works. Let's gc the oldest dirty block.
2668 */
2669
2670 if (prioritised_exist &&
2671 !selected && dev->oldest_dirty_block > 0)
2672 selected = dev->oldest_dirty_block;
2673
2674 if (!prioritised_exist) /* None found, so we can clear this */
2675 dev->has_pending_prioritised_gc = 0;
William Juul0e8cc8b2007-11-15 11:13:05 +01002676 }
2677
Charles Manning753ac612012-05-09 16:55:17 +00002678 /* If we're doing aggressive GC then we are happy to take a less-dirty
2679 * block, and search harder.
2680 * else (leasurely gc), then we only bother to do this if the
2681 * block has only a few pages in use.
2682 */
William Juul0e8cc8b2007-11-15 11:13:05 +01002683
Charles Manning753ac612012-05-09 16:55:17 +00002684 if (!selected) {
2685 int pages_used;
2686 int n_blocks =
2687 dev->internal_end_block - dev->internal_start_block + 1;
2688 if (aggressive) {
2689 threshold = dev->param.chunks_per_block;
2690 iterations = n_blocks;
2691 } else {
2692 int max_threshold;
2693
2694 if (background)
2695 max_threshold = dev->param.chunks_per_block / 2;
2696 else
2697 max_threshold = dev->param.chunks_per_block / 8;
2698
2699 if (max_threshold < YAFFS_GC_PASSIVE_THRESHOLD)
2700 max_threshold = YAFFS_GC_PASSIVE_THRESHOLD;
2701
2702 threshold = background ? (dev->gc_not_done + 2) * 2 : 0;
2703 if (threshold < YAFFS_GC_PASSIVE_THRESHOLD)
2704 threshold = YAFFS_GC_PASSIVE_THRESHOLD;
2705 if (threshold > max_threshold)
2706 threshold = max_threshold;
2707
2708 iterations = n_blocks / 16 + 1;
2709 if (iterations > 100)
2710 iterations = 100;
2711 }
2712
2713 for (i = 0;
2714 i < iterations &&
2715 (dev->gc_dirtiest < 1 ||
2716 dev->gc_pages_in_use > YAFFS_GC_GOOD_ENOUGH);
2717 i++) {
2718 dev->gc_block_finder++;
2719 if (dev->gc_block_finder < dev->internal_start_block ||
2720 dev->gc_block_finder > dev->internal_end_block)
2721 dev->gc_block_finder =
2722 dev->internal_start_block;
2723
2724 bi = yaffs_get_block_info(dev, dev->gc_block_finder);
2725
2726 pages_used = bi->pages_in_use - bi->soft_del_pages;
2727
2728 if (bi->block_state == YAFFS_BLOCK_STATE_FULL &&
2729 pages_used < dev->param.chunks_per_block &&
2730 (dev->gc_dirtiest < 1 ||
2731 pages_used < dev->gc_pages_in_use) &&
2732 yaffs_block_ok_for_gc(dev, bi)) {
2733 dev->gc_dirtiest = dev->gc_block_finder;
2734 dev->gc_pages_in_use = pages_used;
2735 }
2736 }
2737
2738 if (dev->gc_dirtiest > 0 && dev->gc_pages_in_use <= threshold)
2739 selected = dev->gc_dirtiest;
2740 }
2741
2742 /*
2743 * If nothing has been selected for a while, try the oldest dirty
2744 * because that's gumming up the works.
2745 */
2746
2747 if (!selected && dev->param.is_yaffs2 &&
2748 dev->gc_not_done >= (background ? 10 : 20)) {
2749 yaffs2_find_oldest_dirty_seq(dev);
2750 if (dev->oldest_dirty_block > 0) {
2751 selected = dev->oldest_dirty_block;
2752 dev->gc_dirtiest = selected;
2753 dev->oldest_dirty_gc_count++;
2754 bi = yaffs_get_block_info(dev, selected);
2755 dev->gc_pages_in_use =
2756 bi->pages_in_use - bi->soft_del_pages;
2757 } else {
2758 dev->gc_not_done = 0;
2759 }
2760 }
2761
2762 if (selected) {
2763 yaffs_trace(YAFFS_TRACE_GC,
2764 "GC Selected block %d with %d free, prioritised:%d",
2765 selected,
2766 dev->param.chunks_per_block - dev->gc_pages_in_use,
2767 prioritised);
2768
2769 dev->n_gc_blocks++;
2770 if (background)
2771 dev->bg_gcs++;
2772
2773 dev->gc_dirtiest = 0;
2774 dev->gc_pages_in_use = 0;
2775 dev->gc_not_done = 0;
2776 if (dev->refresh_skip > 0)
2777 dev->refresh_skip--;
2778 } else {
2779 dev->gc_not_done++;
2780 yaffs_trace(YAFFS_TRACE_GC,
2781 "GC none: finder %d skip %d threshold %d dirtiest %d using %d oldest %d%s",
2782 dev->gc_block_finder, dev->gc_not_done, threshold,
2783 dev->gc_dirtiest, dev->gc_pages_in_use,
2784 dev->oldest_dirty_block, background ? " bg" : "");
2785 }
2786
2787 return selected;
William Juul0e8cc8b2007-11-15 11:13:05 +01002788}
2789
2790/* New garbage collector
2791 * If we're very low on erased blocks then we do aggressive garbage collection
2792 * otherwise we do "leasurely" garbage collection.
2793 * Aggressive gc looks further (whole array) and will accept less dirty blocks.
Charles Manning753ac612012-05-09 16:55:17 +00002794 * Passive gc only inspects smaller areas and only accepts more dirty blocks.
William Juul0e8cc8b2007-11-15 11:13:05 +01002795 *
2796 * The idea is to help clear out space in a more spread-out manner.
2797 * Dunno if it really does anything useful.
2798 */
Charles Manning753ac612012-05-09 16:55:17 +00002799static int yaffs_check_gc(struct yaffs_dev *dev, int background)
William Juul0e8cc8b2007-11-15 11:13:05 +01002800{
Charles Manning753ac612012-05-09 16:55:17 +00002801 int aggressive = 0;
2802 int gc_ok = YAFFS_OK;
2803 int max_tries = 0;
2804 int min_erased;
2805 int erased_chunks;
2806 int checkpt_block_adjust;
Wolfgang Denk4b070802008-08-14 14:41:06 +02002807
Charles Manning753ac612012-05-09 16:55:17 +00002808 if (dev->param.gc_control && (dev->param.gc_control(dev) & 1) == 0)
2809 return YAFFS_OK;
William Juul0e8cc8b2007-11-15 11:13:05 +01002810
Charles Manning753ac612012-05-09 16:55:17 +00002811 if (dev->gc_disable)
William Juul0e8cc8b2007-11-15 11:13:05 +01002812 /* Bail out so we don't get recursive gc */
2813 return YAFFS_OK;
Wolfgang Denk4b070802008-08-14 14:41:06 +02002814
William Juul0e8cc8b2007-11-15 11:13:05 +01002815 /* This loop should pass the first time.
Charles Manning753ac612012-05-09 16:55:17 +00002816 * Only loops here if the collection does not increase space.
William Juul0e8cc8b2007-11-15 11:13:05 +01002817 */
2818
2819 do {
Charles Manning753ac612012-05-09 16:55:17 +00002820 max_tries++;
Wolfgang Denk4b070802008-08-14 14:41:06 +02002821
Charles Manning753ac612012-05-09 16:55:17 +00002822 checkpt_block_adjust = yaffs_calc_checkpt_blocks_required(dev);
William Juul0e8cc8b2007-11-15 11:13:05 +01002823
Charles Manning753ac612012-05-09 16:55:17 +00002824 min_erased =
2825 dev->param.n_reserved_blocks + checkpt_block_adjust + 1;
2826 erased_chunks =
2827 dev->n_erased_blocks * dev->param.chunks_per_block;
2828
2829 /* If we need a block soon then do aggressive gc. */
2830 if (dev->n_erased_blocks < min_erased)
William Juul0e8cc8b2007-11-15 11:13:05 +01002831 aggressive = 1;
Charles Manning753ac612012-05-09 16:55:17 +00002832 else {
2833 if (!background
2834 && erased_chunks > (dev->n_free_chunks / 4))
2835 break;
William Juul0e8cc8b2007-11-15 11:13:05 +01002836
Charles Manning753ac612012-05-09 16:55:17 +00002837 if (dev->gc_skip > 20)
2838 dev->gc_skip = 20;
2839 if (erased_chunks < dev->n_free_chunks / 2 ||
2840 dev->gc_skip < 1 || background)
2841 aggressive = 0;
2842 else {
2843 dev->gc_skip--;
2844 break;
William Juul0e8cc8b2007-11-15 11:13:05 +01002845 }
William Juul0e8cc8b2007-11-15 11:13:05 +01002846 }
2847
Charles Manning753ac612012-05-09 16:55:17 +00002848 dev->gc_skip = 5;
William Juul0e8cc8b2007-11-15 11:13:05 +01002849
Charles Manning753ac612012-05-09 16:55:17 +00002850 /* If we don't already have a block being gc'd then see if we
2851 * should start another */
2852
2853 if (dev->gc_block < 1 && !aggressive) {
2854 dev->gc_block = yaffs2_find_refresh_block(dev);
2855 dev->gc_chunk = 0;
2856 dev->n_clean_ups = 0;
2857 }
2858 if (dev->gc_block < 1) {
2859 dev->gc_block =
2860 yaffs_find_gc_block(dev, aggressive, background);
2861 dev->gc_chunk = 0;
2862 dev->n_clean_ups = 0;
2863 }
2864
2865 if (dev->gc_block > 0) {
2866 dev->all_gcs++;
2867 if (!aggressive)
2868 dev->passive_gc_count++;
2869
2870 yaffs_trace(YAFFS_TRACE_GC,
2871 "yaffs: GC n_erased_blocks %d aggressive %d",
2872 dev->n_erased_blocks, aggressive);
2873
2874 gc_ok = yaffs_gc_block(dev, dev->gc_block, aggressive);
2875 }
2876
2877 if (dev->n_erased_blocks < (dev->param.n_reserved_blocks) &&
2878 dev->gc_block > 0) {
2879 yaffs_trace(YAFFS_TRACE_GC,
2880 "yaffs: GC !!!no reclaim!!! n_erased_blocks %d after try %d block %d",
2881 dev->n_erased_blocks, max_tries,
2882 dev->gc_block);
2883 }
2884 } while ((dev->n_erased_blocks < dev->param.n_reserved_blocks) &&
2885 (dev->gc_block > 0) && (max_tries < 2));
2886
2887 return aggressive ? gc_ok : YAFFS_OK;
William Juul0e8cc8b2007-11-15 11:13:05 +01002888}
2889
Charles Manning753ac612012-05-09 16:55:17 +00002890/*
2891 * yaffs_bg_gc()
2892 * Garbage collects. Intended to be called from a background thread.
2893 * Returns non-zero if at least half the free chunks are erased.
2894 */
2895int yaffs_bg_gc(struct yaffs_dev *dev, unsigned urgency)
William Juul0e8cc8b2007-11-15 11:13:05 +01002896{
Charles Manning753ac612012-05-09 16:55:17 +00002897 int erased_chunks = dev->n_erased_blocks * dev->param.chunks_per_block;
William Juul0e8cc8b2007-11-15 11:13:05 +01002898
Charles Manning753ac612012-05-09 16:55:17 +00002899 yaffs_trace(YAFFS_TRACE_BACKGROUND, "Background gc %u", urgency);
2900
2901 yaffs_check_gc(dev, 1);
2902 return erased_chunks > dev->n_free_chunks / 2;
William Juul0e8cc8b2007-11-15 11:13:05 +01002903}
2904
William Juul0e8cc8b2007-11-15 11:13:05 +01002905/*-------------------- Data file manipulation -----------------*/
2906
Charles Manning753ac612012-05-09 16:55:17 +00002907static int yaffs_rd_data_obj(struct yaffs_obj *in, int inode_chunk, u8 * buffer)
William Juul0e8cc8b2007-11-15 11:13:05 +01002908{
Charles Manning753ac612012-05-09 16:55:17 +00002909 int nand_chunk = yaffs_find_chunk_in_file(in, inode_chunk, NULL);
William Juul0e8cc8b2007-11-15 11:13:05 +01002910
Charles Manning753ac612012-05-09 16:55:17 +00002911 if (nand_chunk >= 0)
2912 return yaffs_rd_chunk_tags_nand(in->my_dev, nand_chunk,
2913 buffer, NULL);
2914 else {
2915 yaffs_trace(YAFFS_TRACE_NANDACCESS,
2916 "Chunk %d not found zero instead",
2917 nand_chunk);
William Juul0e8cc8b2007-11-15 11:13:05 +01002918 /* get sane (zero) data if you read a hole */
Charles Manning753ac612012-05-09 16:55:17 +00002919 memset(buffer, 0, in->my_dev->data_bytes_per_chunk);
William Juul0e8cc8b2007-11-15 11:13:05 +01002920 return 0;
2921 }
2922
2923}
2924
Charles Manning753ac612012-05-09 16:55:17 +00002925void yaffs_chunk_del(struct yaffs_dev *dev, int chunk_id, int mark_flash,
2926 int lyn)
William Juul0e8cc8b2007-11-15 11:13:05 +01002927{
2928 int block;
2929 int page;
Charles Manning753ac612012-05-09 16:55:17 +00002930 struct yaffs_ext_tags tags;
2931 struct yaffs_block_info *bi;
William Juul0e8cc8b2007-11-15 11:13:05 +01002932
Charles Manning753ac612012-05-09 16:55:17 +00002933 if (chunk_id <= 0)
William Juul0e8cc8b2007-11-15 11:13:05 +01002934 return;
Wolfgang Denk4b070802008-08-14 14:41:06 +02002935
Charles Manning753ac612012-05-09 16:55:17 +00002936 dev->n_deletions++;
2937 block = chunk_id / dev->param.chunks_per_block;
2938 page = chunk_id % dev->param.chunks_per_block;
William Juul0e8cc8b2007-11-15 11:13:05 +01002939
Charles Manning753ac612012-05-09 16:55:17 +00002940 if (!yaffs_check_chunk_bit(dev, block, page))
2941 yaffs_trace(YAFFS_TRACE_VERIFY,
2942 "Deleting invalid chunk %d", chunk_id);
William Juul0e8cc8b2007-11-15 11:13:05 +01002943
Charles Manning753ac612012-05-09 16:55:17 +00002944 bi = yaffs_get_block_info(dev, block);
William Juul0e8cc8b2007-11-15 11:13:05 +01002945
Charles Manning753ac612012-05-09 16:55:17 +00002946 yaffs2_update_oldest_dirty_seq(dev, block, bi);
William Juul0e8cc8b2007-11-15 11:13:05 +01002947
Charles Manning753ac612012-05-09 16:55:17 +00002948 yaffs_trace(YAFFS_TRACE_DELETION,
2949 "line %d delete of chunk %d",
2950 lyn, chunk_id);
William Juul0e8cc8b2007-11-15 11:13:05 +01002951
Charles Manning753ac612012-05-09 16:55:17 +00002952 if (!dev->param.is_yaffs2 && mark_flash &&
2953 bi->block_state != YAFFS_BLOCK_STATE_COLLECTING) {
William Juul0e8cc8b2007-11-15 11:13:05 +01002954
Charles Manning753ac612012-05-09 16:55:17 +00002955 memset(&tags, 0, sizeof(tags));
2956 tags.is_deleted = 1;
2957 yaffs_wr_chunk_tags_nand(dev, chunk_id, NULL, &tags);
2958 yaffs_handle_chunk_update(dev, chunk_id, &tags);
William Juul0e8cc8b2007-11-15 11:13:05 +01002959 } else {
Charles Manning753ac612012-05-09 16:55:17 +00002960 dev->n_unmarked_deletions++;
William Juul0e8cc8b2007-11-15 11:13:05 +01002961 }
2962
2963 /* Pull out of the management area.
2964 * If the whole block became dirty, this will kick off an erasure.
2965 */
Charles Manning753ac612012-05-09 16:55:17 +00002966 if (bi->block_state == YAFFS_BLOCK_STATE_ALLOCATING ||
2967 bi->block_state == YAFFS_BLOCK_STATE_FULL ||
2968 bi->block_state == YAFFS_BLOCK_STATE_NEEDS_SCAN ||
2969 bi->block_state == YAFFS_BLOCK_STATE_COLLECTING) {
2970 dev->n_free_chunks++;
2971 yaffs_clear_chunk_bit(dev, block, page);
2972 bi->pages_in_use--;
William Juul0e8cc8b2007-11-15 11:13:05 +01002973
Charles Manning753ac612012-05-09 16:55:17 +00002974 if (bi->pages_in_use == 0 &&
2975 !bi->has_shrink_hdr &&
2976 bi->block_state != YAFFS_BLOCK_STATE_ALLOCATING &&
2977 bi->block_state != YAFFS_BLOCK_STATE_NEEDS_SCAN) {
2978 yaffs_block_became_dirty(dev, block);
William Juul0e8cc8b2007-11-15 11:13:05 +01002979 }
William Juul0e8cc8b2007-11-15 11:13:05 +01002980 }
William Juul0e8cc8b2007-11-15 11:13:05 +01002981}
2982
Charles Manning753ac612012-05-09 16:55:17 +00002983static int yaffs_wr_data_obj(struct yaffs_obj *in, int inode_chunk,
2984 const u8 *buffer, int n_bytes, int use_reserve)
William Juul0e8cc8b2007-11-15 11:13:05 +01002985{
2986 /* Find old chunk Need to do this to get serial number
2987 * Write new one and patch into tree.
2988 * Invalidate old tags.
2989 */
2990
Charles Manning753ac612012-05-09 16:55:17 +00002991 int prev_chunk_id;
2992 struct yaffs_ext_tags prev_tags;
2993 int new_chunk_id;
2994 struct yaffs_ext_tags new_tags;
2995 struct yaffs_dev *dev = in->my_dev;
William Juul0e8cc8b2007-11-15 11:13:05 +01002996
Charles Manning753ac612012-05-09 16:55:17 +00002997 yaffs_check_gc(dev, 0);
William Juul0e8cc8b2007-11-15 11:13:05 +01002998
Charles Manning753ac612012-05-09 16:55:17 +00002999 /* Get the previous chunk at this location in the file if it exists.
3000 * If it does not exist then put a zero into the tree. This creates
3001 * the tnode now, rather than later when it is harder to clean up.
3002 */
3003 prev_chunk_id = yaffs_find_chunk_in_file(in, inode_chunk, &prev_tags);
3004 if (prev_chunk_id < 1 &&
3005 !yaffs_put_chunk_in_file(in, inode_chunk, 0, 0))
3006 return 0;
William Juul0e8cc8b2007-11-15 11:13:05 +01003007
3008 /* Set up new tags */
Charles Manning753ac612012-05-09 16:55:17 +00003009 memset(&new_tags, 0, sizeof(new_tags));
William Juul0e8cc8b2007-11-15 11:13:05 +01003010
Charles Manning753ac612012-05-09 16:55:17 +00003011 new_tags.chunk_id = inode_chunk;
3012 new_tags.obj_id = in->obj_id;
3013 new_tags.serial_number =
3014 (prev_chunk_id > 0) ? prev_tags.serial_number + 1 : 1;
3015 new_tags.n_bytes = n_bytes;
William Juul0e8cc8b2007-11-15 11:13:05 +01003016
Charles Manning753ac612012-05-09 16:55:17 +00003017 if (n_bytes < 1 || n_bytes > dev->param.total_bytes_per_chunk) {
3018 yaffs_trace(YAFFS_TRACE_ERROR,
3019 "Writing %d bytes to chunk!!!!!!!!!",
3020 n_bytes);
3021 BUG();
3022 }
William Juul0e8cc8b2007-11-15 11:13:05 +01003023
Charles Manning753ac612012-05-09 16:55:17 +00003024 new_chunk_id =
3025 yaffs_write_new_chunk(dev, buffer, &new_tags, use_reserve);
William Juul0e8cc8b2007-11-15 11:13:05 +01003026
Charles Manning753ac612012-05-09 16:55:17 +00003027 if (new_chunk_id > 0) {
3028 yaffs_put_chunk_in_file(in, inode_chunk, new_chunk_id, 0);
William Juul0e8cc8b2007-11-15 11:13:05 +01003029
Charles Manning753ac612012-05-09 16:55:17 +00003030 if (prev_chunk_id > 0)
3031 yaffs_chunk_del(dev, prev_chunk_id, 1, __LINE__);
3032
3033 yaffs_verify_file_sane(in);
3034 }
3035 return new_chunk_id;
3036
3037}
3038
3039
3040
3041static int yaffs_do_xattrib_mod(struct yaffs_obj *obj, int set,
3042 const YCHAR *name, const void *value, int size,
3043 int flags)
3044{
3045 struct yaffs_xattr_mod xmod;
3046 int result;
3047
3048 xmod.set = set;
3049 xmod.name = name;
3050 xmod.data = value;
3051 xmod.size = size;
3052 xmod.flags = flags;
3053 xmod.result = -ENOSPC;
3054
3055 result = yaffs_update_oh(obj, NULL, 0, 0, 0, &xmod);
3056
3057 if (result > 0)
3058 return xmod.result;
3059 else
3060 return -ENOSPC;
3061}
3062
3063static int yaffs_apply_xattrib_mod(struct yaffs_obj *obj, char *buffer,
3064 struct yaffs_xattr_mod *xmod)
3065{
3066 int retval = 0;
3067 int x_offs = sizeof(struct yaffs_obj_hdr);
3068 struct yaffs_dev *dev = obj->my_dev;
3069 int x_size = dev->data_bytes_per_chunk - sizeof(struct yaffs_obj_hdr);
3070 char *x_buffer = buffer + x_offs;
3071
3072 if (xmod->set)
3073 retval =
3074 nval_set(x_buffer, x_size, xmod->name, xmod->data,
3075 xmod->size, xmod->flags);
3076 else
3077 retval = nval_del(x_buffer, x_size, xmod->name);
3078
3079 obj->has_xattr = nval_hasvalues(x_buffer, x_size);
3080 obj->xattr_known = 1;
3081 xmod->result = retval;
3082
3083 return retval;
3084}
3085
3086static int yaffs_do_xattrib_fetch(struct yaffs_obj *obj, const YCHAR *name,
3087 void *value, int size)
3088{
3089 char *buffer = NULL;
3090 int result;
3091 struct yaffs_ext_tags tags;
3092 struct yaffs_dev *dev = obj->my_dev;
3093 int x_offs = sizeof(struct yaffs_obj_hdr);
3094 int x_size = dev->data_bytes_per_chunk - sizeof(struct yaffs_obj_hdr);
3095 char *x_buffer;
3096 int retval = 0;
3097
3098 if (obj->hdr_chunk < 1)
3099 return -ENODATA;
3100
3101 /* If we know that the object has no xattribs then don't do all the
3102 * reading and parsing.
3103 */
3104 if (obj->xattr_known && !obj->has_xattr) {
3105 if (name)
3106 return -ENODATA;
3107 else
3108 return 0;
3109 }
3110
3111 buffer = (char *)yaffs_get_temp_buffer(dev);
3112 if (!buffer)
3113 return -ENOMEM;
3114
3115 result =
3116 yaffs_rd_chunk_tags_nand(dev, obj->hdr_chunk, (u8 *) buffer, &tags);
3117
3118 if (result != YAFFS_OK)
3119 retval = -ENOENT;
3120 else {
3121 x_buffer = buffer + x_offs;
3122
3123 if (!obj->xattr_known) {
3124 obj->has_xattr = nval_hasvalues(x_buffer, x_size);
3125 obj->xattr_known = 1;
William Juul0e8cc8b2007-11-15 11:13:05 +01003126 }
3127
Charles Manning753ac612012-05-09 16:55:17 +00003128 if (name)
3129 retval = nval_get(x_buffer, x_size, name, value, size);
3130 else
3131 retval = nval_list(x_buffer, x_size, value, size);
William Juul0e8cc8b2007-11-15 11:13:05 +01003132 }
Charles Manning753ac612012-05-09 16:55:17 +00003133 yaffs_release_temp_buffer(dev, (u8 *) buffer);
3134 return retval;
3135}
William Juul0e8cc8b2007-11-15 11:13:05 +01003136
Charles Manning753ac612012-05-09 16:55:17 +00003137int yaffs_set_xattrib(struct yaffs_obj *obj, const YCHAR * name,
3138 const void *value, int size, int flags)
3139{
3140 return yaffs_do_xattrib_mod(obj, 1, name, value, size, flags);
3141}
3142
3143int yaffs_remove_xattrib(struct yaffs_obj *obj, const YCHAR * name)
3144{
3145 return yaffs_do_xattrib_mod(obj, 0, name, NULL, 0, 0);
3146}
3147
3148int yaffs_get_xattrib(struct yaffs_obj *obj, const YCHAR * name, void *value,
3149 int size)
3150{
3151 return yaffs_do_xattrib_fetch(obj, name, value, size);
3152}
3153
3154int yaffs_list_xattrib(struct yaffs_obj *obj, char *buffer, int size)
3155{
3156 return yaffs_do_xattrib_fetch(obj, NULL, buffer, size);
3157}
3158
3159static void yaffs_check_obj_details_loaded(struct yaffs_obj *in)
3160{
3161 u8 *buf;
3162 struct yaffs_obj_hdr *oh;
3163 struct yaffs_dev *dev;
3164 struct yaffs_ext_tags tags;
Charles Manning753ac612012-05-09 16:55:17 +00003165
3166 if (!in || !in->lazy_loaded || in->hdr_chunk < 1)
3167 return;
3168
3169 dev = in->my_dev;
3170 in->lazy_loaded = 0;
3171 buf = yaffs_get_temp_buffer(dev);
3172
Anatolij Gustschin8cc64ba2012-10-05 23:31:03 +00003173 yaffs_rd_chunk_tags_nand(dev, in->hdr_chunk, buf, &tags);
Charles Manning753ac612012-05-09 16:55:17 +00003174 oh = (struct yaffs_obj_hdr *)buf;
3175
3176 in->yst_mode = oh->yst_mode;
3177 yaffs_load_attribs(in, oh);
3178 yaffs_set_obj_name_from_oh(in, oh);
3179
3180 if (in->variant_type == YAFFS_OBJECT_TYPE_SYMLINK) {
3181 in->variant.symlink_variant.alias =
3182 yaffs_clone_str(oh->alias);
Charles Manning753ac612012-05-09 16:55:17 +00003183 }
3184 yaffs_release_temp_buffer(dev, buf);
3185}
3186
3187static void yaffs_load_name_from_oh(struct yaffs_dev *dev, YCHAR *name,
3188 const YCHAR *oh_name, int buff_size)
3189{
3190#ifdef CONFIG_YAFFS_AUTO_UNICODE
3191 if (dev->param.auto_unicode) {
3192 if (*oh_name) {
3193 /* It is an ASCII name, do an ASCII to
3194 * unicode conversion */
3195 const char *ascii_oh_name = (const char *)oh_name;
3196 int n = buff_size - 1;
3197 while (n > 0 && *ascii_oh_name) {
3198 *name = *ascii_oh_name;
3199 name++;
3200 ascii_oh_name++;
3201 n--;
3202 }
3203 } else {
3204 yaffs_strncpy(name, oh_name + 1, buff_size - 1);
3205 }
Jeroen Hofstee862c93e2014-07-12 15:16:52 +02003206
3207 return;
Charles Manning753ac612012-05-09 16:55:17 +00003208 }
Jeroen Hofstee862c93e2014-07-12 15:16:52 +02003209#endif
3210
3211 yaffs_strncpy(name, oh_name, buff_size - 1);
Charles Manning753ac612012-05-09 16:55:17 +00003212}
3213
3214static void yaffs_load_oh_from_name(struct yaffs_dev *dev, YCHAR *oh_name,
3215 const YCHAR *name)
3216{
3217#ifdef CONFIG_YAFFS_AUTO_UNICODE
Charles Manning753ac612012-05-09 16:55:17 +00003218 int is_ascii;
3219 YCHAR *w;
3220
3221 if (dev->param.auto_unicode) {
3222
3223 is_ascii = 1;
3224 w = name;
3225
3226 /* Figure out if the name will fit in ascii character set */
3227 while (is_ascii && *w) {
3228 if ((*w) & 0xff00)
3229 is_ascii = 0;
3230 w++;
3231 }
3232
3233 if (is_ascii) {
3234 /* It is an ASCII name, so convert unicode to ascii */
3235 char *ascii_oh_name = (char *)oh_name;
3236 int n = YAFFS_MAX_NAME_LENGTH - 1;
3237 while (n > 0 && *name) {
3238 *ascii_oh_name = *name;
3239 name++;
3240 ascii_oh_name++;
3241 n--;
3242 }
3243 } else {
3244 /* Unicode name, so save starting at the second YCHAR */
3245 *oh_name = 0;
3246 yaffs_strncpy(oh_name + 1, name, YAFFS_MAX_NAME_LENGTH - 2);
3247 }
Jeroen Hofstee862c93e2014-07-12 15:16:52 +02003248
3249 return;
Charles Manning753ac612012-05-09 16:55:17 +00003250 }
Jeroen Hofstee862c93e2014-07-12 15:16:52 +02003251#endif
3252
3253 yaffs_strncpy(oh_name, name, YAFFS_MAX_NAME_LENGTH - 1);
William Juul0e8cc8b2007-11-15 11:13:05 +01003254}
3255
3256/* UpdateObjectHeader updates the header on NAND for an object.
3257 * If name is not NULL, then that new name is used.
3258 */
Charles Manning753ac612012-05-09 16:55:17 +00003259int yaffs_update_oh(struct yaffs_obj *in, const YCHAR *name, int force,
3260 int is_shrink, int shadows, struct yaffs_xattr_mod *xmod)
William Juul0e8cc8b2007-11-15 11:13:05 +01003261{
3262
Charles Manning753ac612012-05-09 16:55:17 +00003263 struct yaffs_block_info *bi;
3264 struct yaffs_dev *dev = in->my_dev;
3265 int prev_chunk_id;
3266 int ret_val = 0;
Charles Manning753ac612012-05-09 16:55:17 +00003267 int new_chunk_id;
3268 struct yaffs_ext_tags new_tags;
3269 struct yaffs_ext_tags old_tags;
3270 const YCHAR *alias = NULL;
3271 u8 *buffer = NULL;
3272 YCHAR old_name[YAFFS_MAX_NAME_LENGTH + 1];
3273 struct yaffs_obj_hdr *oh = NULL;
3274 loff_t file_size = 0;
William Juul0e8cc8b2007-11-15 11:13:05 +01003275
Charles Manning753ac612012-05-09 16:55:17 +00003276 yaffs_strcpy(old_name, _Y("silly old name"));
William Juul0e8cc8b2007-11-15 11:13:05 +01003277
Charles Manning753ac612012-05-09 16:55:17 +00003278 if (in->fake && in != dev->root_dir && !force && !xmod)
3279 return ret_val;
William Juul0e8cc8b2007-11-15 11:13:05 +01003280
Charles Manning753ac612012-05-09 16:55:17 +00003281 yaffs_check_gc(dev, 0);
3282 yaffs_check_obj_details_loaded(in);
William Juul0e8cc8b2007-11-15 11:13:05 +01003283
Charles Manning753ac612012-05-09 16:55:17 +00003284 buffer = yaffs_get_temp_buffer(in->my_dev);
3285 oh = (struct yaffs_obj_hdr *)buffer;
William Juul0e8cc8b2007-11-15 11:13:05 +01003286
Charles Manning753ac612012-05-09 16:55:17 +00003287 prev_chunk_id = in->hdr_chunk;
Wolfgang Denk4b070802008-08-14 14:41:06 +02003288
Charles Manning753ac612012-05-09 16:55:17 +00003289 if (prev_chunk_id > 0) {
Anatolij Gustschin8cc64ba2012-10-05 23:31:03 +00003290 yaffs_rd_chunk_tags_nand(dev, prev_chunk_id,
3291 buffer, &old_tags);
William Juul0e8cc8b2007-11-15 11:13:05 +01003292
Charles Manning753ac612012-05-09 16:55:17 +00003293 yaffs_verify_oh(in, oh, &old_tags, 0);
3294 memcpy(old_name, oh->name, sizeof(oh->name));
3295 memset(buffer, 0xff, sizeof(struct yaffs_obj_hdr));
3296 } else {
3297 memset(buffer, 0xff, dev->data_bytes_per_chunk);
William Juul0e8cc8b2007-11-15 11:13:05 +01003298 }
3299
Charles Manning753ac612012-05-09 16:55:17 +00003300 oh->type = in->variant_type;
3301 oh->yst_mode = in->yst_mode;
3302 oh->shadows_obj = oh->inband_shadowed_obj_id = shadows;
3303
3304 yaffs_load_attribs_oh(oh, in);
3305
3306 if (in->parent)
3307 oh->parent_obj_id = in->parent->obj_id;
3308 else
3309 oh->parent_obj_id = 0;
3310
3311 if (name && *name) {
3312 memset(oh->name, 0, sizeof(oh->name));
3313 yaffs_load_oh_from_name(dev, oh->name, name);
3314 } else if (prev_chunk_id > 0) {
3315 memcpy(oh->name, old_name, sizeof(oh->name));
3316 } else {
3317 memset(oh->name, 0, sizeof(oh->name));
3318 }
3319
3320 oh->is_shrink = is_shrink;
3321
3322 switch (in->variant_type) {
3323 case YAFFS_OBJECT_TYPE_UNKNOWN:
3324 /* Should not happen */
3325 break;
3326 case YAFFS_OBJECT_TYPE_FILE:
3327 if (oh->parent_obj_id != YAFFS_OBJECTID_DELETED &&
3328 oh->parent_obj_id != YAFFS_OBJECTID_UNLINKED)
3329 file_size = in->variant.file_variant.file_size;
3330 yaffs_oh_size_load(oh, file_size);
3331 break;
3332 case YAFFS_OBJECT_TYPE_HARDLINK:
3333 oh->equiv_id = in->variant.hardlink_variant.equiv_id;
3334 break;
3335 case YAFFS_OBJECT_TYPE_SPECIAL:
3336 /* Do nothing */
3337 break;
3338 case YAFFS_OBJECT_TYPE_DIRECTORY:
3339 /* Do nothing */
3340 break;
3341 case YAFFS_OBJECT_TYPE_SYMLINK:
3342 alias = in->variant.symlink_variant.alias;
3343 if (!alias)
3344 alias = _Y("no alias");
3345 yaffs_strncpy(oh->alias, alias, YAFFS_MAX_ALIAS_LENGTH);
3346 oh->alias[YAFFS_MAX_ALIAS_LENGTH] = 0;
3347 break;
3348 }
3349
3350 /* process any xattrib modifications */
3351 if (xmod)
3352 yaffs_apply_xattrib_mod(in, (char *)buffer, xmod);
3353
3354 /* Tags */
3355 memset(&new_tags, 0, sizeof(new_tags));
3356 in->serial++;
3357 new_tags.chunk_id = 0;
3358 new_tags.obj_id = in->obj_id;
3359 new_tags.serial_number = in->serial;
3360
3361 /* Add extra info for file header */
3362 new_tags.extra_available = 1;
3363 new_tags.extra_parent_id = oh->parent_obj_id;
3364 new_tags.extra_file_size = file_size;
3365 new_tags.extra_is_shrink = oh->is_shrink;
3366 new_tags.extra_equiv_id = oh->equiv_id;
3367 new_tags.extra_shadows = (oh->shadows_obj > 0) ? 1 : 0;
3368 new_tags.extra_obj_type = in->variant_type;
3369 yaffs_verify_oh(in, oh, &new_tags, 1);
3370
3371 /* Create new chunk in NAND */
3372 new_chunk_id =
3373 yaffs_write_new_chunk(dev, buffer, &new_tags,
3374 (prev_chunk_id > 0) ? 1 : 0);
3375
William Juul0e8cc8b2007-11-15 11:13:05 +01003376 if (buffer)
Charles Manning753ac612012-05-09 16:55:17 +00003377 yaffs_release_temp_buffer(dev, buffer);
William Juul0e8cc8b2007-11-15 11:13:05 +01003378
Charles Manning753ac612012-05-09 16:55:17 +00003379 if (new_chunk_id < 0)
3380 return new_chunk_id;
William Juul0e8cc8b2007-11-15 11:13:05 +01003381
Charles Manning753ac612012-05-09 16:55:17 +00003382 in->hdr_chunk = new_chunk_id;
William Juul0e8cc8b2007-11-15 11:13:05 +01003383
Charles Manning753ac612012-05-09 16:55:17 +00003384 if (prev_chunk_id > 0)
3385 yaffs_chunk_del(dev, prev_chunk_id, 1, __LINE__);
Wolfgang Denk4b070802008-08-14 14:41:06 +02003386
Charles Manning753ac612012-05-09 16:55:17 +00003387 if (!yaffs_obj_cache_dirty(in))
3388 in->dirty = 0;
Wolfgang Denk4b070802008-08-14 14:41:06 +02003389
Charles Manning753ac612012-05-09 16:55:17 +00003390 /* If this was a shrink, then mark the block
3391 * that the chunk lives on */
3392 if (is_shrink) {
3393 bi = yaffs_get_block_info(in->my_dev,
3394 new_chunk_id /
3395 in->my_dev->param.chunks_per_block);
3396 bi->has_shrink_hdr = 1;
William Juul0e8cc8b2007-11-15 11:13:05 +01003397 }
Wolfgang Denk4b070802008-08-14 14:41:06 +02003398
3399
Charles Manning753ac612012-05-09 16:55:17 +00003400 return new_chunk_id;
William Juul0e8cc8b2007-11-15 11:13:05 +01003401}
3402
3403/*--------------------- File read/write ------------------------
3404 * Read and write have very similar structures.
3405 * In general the read/write has three parts to it
3406 * An incomplete chunk to start with (if the read/write is not chunk-aligned)
3407 * Some complete chunks
3408 * An incomplete chunk to end off with
3409 *
3410 * Curve-balls: the first chunk might also be the last chunk.
3411 */
3412
Charles Manning753ac612012-05-09 16:55:17 +00003413int yaffs_file_rd(struct yaffs_obj *in, u8 * buffer, loff_t offset, int n_bytes)
William Juul0e8cc8b2007-11-15 11:13:05 +01003414{
Charles Manning753ac612012-05-09 16:55:17 +00003415 int chunk;
3416 u32 start;
3417 int n_copy;
3418 int n = n_bytes;
3419 int n_done = 0;
3420 struct yaffs_cache *cache;
3421 struct yaffs_dev *dev;
William Juul0e8cc8b2007-11-15 11:13:05 +01003422
Charles Manning753ac612012-05-09 16:55:17 +00003423 dev = in->my_dev;
William Juul0e8cc8b2007-11-15 11:13:05 +01003424
3425 while (n > 0) {
Charles Manning753ac612012-05-09 16:55:17 +00003426 yaffs_addr_to_chunk(dev, offset, &chunk, &start);
William Juul0e8cc8b2007-11-15 11:13:05 +01003427 chunk++;
3428
3429 /* OK now check for the curveball where the start and end are in
Wolfgang Denk4b070802008-08-14 14:41:06 +02003430 * the same chunk.
William Juul0e8cc8b2007-11-15 11:13:05 +01003431 */
Charles Manning753ac612012-05-09 16:55:17 +00003432 if ((start + n) < dev->data_bytes_per_chunk)
3433 n_copy = n;
3434 else
3435 n_copy = dev->data_bytes_per_chunk - start;
William Juul0e8cc8b2007-11-15 11:13:05 +01003436
Charles Manning753ac612012-05-09 16:55:17 +00003437 cache = yaffs_find_chunk_cache(in, chunk);
William Juul0e8cc8b2007-11-15 11:13:05 +01003438
Charles Manning753ac612012-05-09 16:55:17 +00003439 /* If the chunk is already in the cache or it is less than
3440 * a whole chunk or we're using inband tags then use the cache
3441 * (if there is caching) else bypass the cache.
William Juul0e8cc8b2007-11-15 11:13:05 +01003442 */
Charles Manning753ac612012-05-09 16:55:17 +00003443 if (cache || n_copy != dev->data_bytes_per_chunk ||
3444 dev->param.inband_tags) {
3445 if (dev->param.n_caches > 0) {
William Juul0e8cc8b2007-11-15 11:13:05 +01003446
Charles Manning753ac612012-05-09 16:55:17 +00003447 /* If we can't find the data in the cache,
3448 * then load it up. */
William Juul0e8cc8b2007-11-15 11:13:05 +01003449
3450 if (!cache) {
Charles Manning753ac612012-05-09 16:55:17 +00003451 cache =
3452 yaffs_grab_chunk_cache(in->my_dev);
William Juul0e8cc8b2007-11-15 11:13:05 +01003453 cache->object = in;
Charles Manning753ac612012-05-09 16:55:17 +00003454 cache->chunk_id = chunk;
William Juul0e8cc8b2007-11-15 11:13:05 +01003455 cache->dirty = 0;
3456 cache->locked = 0;
Charles Manning753ac612012-05-09 16:55:17 +00003457 yaffs_rd_data_obj(in, chunk,
3458 cache->data);
3459 cache->n_bytes = 0;
William Juul0e8cc8b2007-11-15 11:13:05 +01003460 }
3461
Charles Manning753ac612012-05-09 16:55:17 +00003462 yaffs_use_cache(dev, cache, 0);
William Juul0e8cc8b2007-11-15 11:13:05 +01003463
3464 cache->locked = 1;
3465
Charles Manning753ac612012-05-09 16:55:17 +00003466 memcpy(buffer, &cache->data[start], n_copy);
William Juul0e8cc8b2007-11-15 11:13:05 +01003467
William Juul0e8cc8b2007-11-15 11:13:05 +01003468 cache->locked = 0;
3469 } else {
Charles Manning753ac612012-05-09 16:55:17 +00003470 /* Read into the local buffer then copy.. */
William Juul0e8cc8b2007-11-15 11:13:05 +01003471
Charles Manning753ac612012-05-09 16:55:17 +00003472 u8 *local_buffer =
3473 yaffs_get_temp_buffer(dev);
3474 yaffs_rd_data_obj(in, chunk, local_buffer);
William Juul0e8cc8b2007-11-15 11:13:05 +01003475
Charles Manning753ac612012-05-09 16:55:17 +00003476 memcpy(buffer, &local_buffer[start], n_copy);
3477
3478 yaffs_release_temp_buffer(dev, local_buffer);
William Juul0e8cc8b2007-11-15 11:13:05 +01003479 }
William Juul0e8cc8b2007-11-15 11:13:05 +01003480 } else {
Charles Manning753ac612012-05-09 16:55:17 +00003481 /* A full chunk. Read directly into the buffer. */
3482 yaffs_rd_data_obj(in, chunk, buffer);
William Juul0e8cc8b2007-11-15 11:13:05 +01003483 }
Charles Manning753ac612012-05-09 16:55:17 +00003484 n -= n_copy;
3485 offset += n_copy;
3486 buffer += n_copy;
3487 n_done += n_copy;
William Juul0e8cc8b2007-11-15 11:13:05 +01003488 }
Charles Manning753ac612012-05-09 16:55:17 +00003489 return n_done;
William Juul0e8cc8b2007-11-15 11:13:05 +01003490}
3491
Charles Manning753ac612012-05-09 16:55:17 +00003492int yaffs_do_file_wr(struct yaffs_obj *in, const u8 *buffer, loff_t offset,
3493 int n_bytes, int write_through)
William Juul0e8cc8b2007-11-15 11:13:05 +01003494{
3495
Charles Manning753ac612012-05-09 16:55:17 +00003496 int chunk;
3497 u32 start;
3498 int n_copy;
3499 int n = n_bytes;
3500 int n_done = 0;
3501 int n_writeback;
3502 loff_t start_write = offset;
3503 int chunk_written = 0;
3504 u32 n_bytes_read;
3505 loff_t chunk_start;
3506 struct yaffs_dev *dev;
William Juul0e8cc8b2007-11-15 11:13:05 +01003507
Charles Manning753ac612012-05-09 16:55:17 +00003508 dev = in->my_dev;
William Juul0e8cc8b2007-11-15 11:13:05 +01003509
Charles Manning753ac612012-05-09 16:55:17 +00003510 while (n > 0 && chunk_written >= 0) {
3511 yaffs_addr_to_chunk(dev, offset, &chunk, &start);
William Juul0e8cc8b2007-11-15 11:13:05 +01003512
Charles Manning753ac612012-05-09 16:55:17 +00003513 if (((loff_t)chunk) *
3514 dev->data_bytes_per_chunk + start != offset ||
3515 start >= dev->data_bytes_per_chunk) {
3516 yaffs_trace(YAFFS_TRACE_ERROR,
3517 "AddrToChunk of offset %lld gives chunk %d start %d",
3518 offset, chunk, start);
3519 }
3520 chunk++; /* File pos to chunk in file offset */
William Juul0e8cc8b2007-11-15 11:13:05 +01003521
3522 /* OK now check for the curveball where the start and end are in
3523 * the same chunk.
3524 */
3525
Charles Manning753ac612012-05-09 16:55:17 +00003526 if ((start + n) < dev->data_bytes_per_chunk) {
3527 n_copy = n;
William Juul0e8cc8b2007-11-15 11:13:05 +01003528
Charles Manning753ac612012-05-09 16:55:17 +00003529 /* Now calculate how many bytes to write back....
3530 * If we're overwriting and not writing to then end of
3531 * file then we need to write back as much as was there
3532 * before.
William Juul0e8cc8b2007-11-15 11:13:05 +01003533 */
3534
Charles Manning753ac612012-05-09 16:55:17 +00003535 chunk_start = (((loff_t)(chunk - 1)) *
3536 dev->data_bytes_per_chunk);
William Juul0e8cc8b2007-11-15 11:13:05 +01003537
Charles Manning753ac612012-05-09 16:55:17 +00003538 if (chunk_start > in->variant.file_variant.file_size)
3539 n_bytes_read = 0; /* Past end of file */
3540 else
3541 n_bytes_read =
3542 in->variant.file_variant.file_size -
3543 chunk_start;
William Juul0e8cc8b2007-11-15 11:13:05 +01003544
Charles Manning753ac612012-05-09 16:55:17 +00003545 if (n_bytes_read > dev->data_bytes_per_chunk)
3546 n_bytes_read = dev->data_bytes_per_chunk;
3547
3548 n_writeback =
3549 (n_bytes_read >
3550 (start + n)) ? n_bytes_read : (start + n);
3551
3552 if (n_writeback < 0 ||
3553 n_writeback > dev->data_bytes_per_chunk)
3554 BUG();
William Juul0e8cc8b2007-11-15 11:13:05 +01003555
3556 } else {
Charles Manning753ac612012-05-09 16:55:17 +00003557 n_copy = dev->data_bytes_per_chunk - start;
3558 n_writeback = dev->data_bytes_per_chunk;
William Juul0e8cc8b2007-11-15 11:13:05 +01003559 }
3560
Charles Manning753ac612012-05-09 16:55:17 +00003561 if (n_copy != dev->data_bytes_per_chunk ||
3562 dev->param.inband_tags) {
3563 /* An incomplete start or end chunk (or maybe both
3564 * start and end chunk), or we're using inband tags,
3565 * so we want to use the cache buffers.
3566 */
3567 if (dev->param.n_caches > 0) {
3568 struct yaffs_cache *cache;
Wolfgang Denk4b070802008-08-14 14:41:06 +02003569
Charles Manning753ac612012-05-09 16:55:17 +00003570 /* If we can't find the data in the cache, then
3571 * load the cache */
3572 cache = yaffs_find_chunk_cache(in, chunk);
3573
3574 if (!cache &&
3575 yaffs_check_alloc_available(dev, 1)) {
3576 cache = yaffs_grab_chunk_cache(dev);
William Juul0e8cc8b2007-11-15 11:13:05 +01003577 cache->object = in;
Charles Manning753ac612012-05-09 16:55:17 +00003578 cache->chunk_id = chunk;
William Juul0e8cc8b2007-11-15 11:13:05 +01003579 cache->dirty = 0;
3580 cache->locked = 0;
Charles Manning753ac612012-05-09 16:55:17 +00003581 yaffs_rd_data_obj(in, chunk,
3582 cache->data);
3583 } else if (cache &&
3584 !cache->dirty &&
3585 !yaffs_check_alloc_available(dev,
3586 1)) {
3587 /* Drop the cache if it was a read cache
3588 * item and no space check has been made
3589 * for it.
Wolfgang Denk4b070802008-08-14 14:41:06 +02003590 */
Charles Manning753ac612012-05-09 16:55:17 +00003591 cache = NULL;
William Juul0e8cc8b2007-11-15 11:13:05 +01003592 }
3593
3594 if (cache) {
Charles Manning753ac612012-05-09 16:55:17 +00003595 yaffs_use_cache(dev, cache, 1);
William Juul0e8cc8b2007-11-15 11:13:05 +01003596 cache->locked = 1;
William Juul0e8cc8b2007-11-15 11:13:05 +01003597
3598 memcpy(&cache->data[start], buffer,
Charles Manning753ac612012-05-09 16:55:17 +00003599 n_copy);
William Juul0e8cc8b2007-11-15 11:13:05 +01003600
William Juul0e8cc8b2007-11-15 11:13:05 +01003601 cache->locked = 0;
Charles Manning753ac612012-05-09 16:55:17 +00003602 cache->n_bytes = n_writeback;
William Juul0e8cc8b2007-11-15 11:13:05 +01003603
Charles Manning753ac612012-05-09 16:55:17 +00003604 if (write_through) {
3605 chunk_written =
3606 yaffs_wr_data_obj
William Juul0e8cc8b2007-11-15 11:13:05 +01003607 (cache->object,
Charles Manning753ac612012-05-09 16:55:17 +00003608 cache->chunk_id,
3609 cache->data,
3610 cache->n_bytes, 1);
William Juul0e8cc8b2007-11-15 11:13:05 +01003611 cache->dirty = 0;
3612 }
William Juul0e8cc8b2007-11-15 11:13:05 +01003613 } else {
Charles Manning753ac612012-05-09 16:55:17 +00003614 chunk_written = -1; /* fail write */
William Juul0e8cc8b2007-11-15 11:13:05 +01003615 }
3616 } else {
Charles Manning753ac612012-05-09 16:55:17 +00003617 /* An incomplete start or end chunk (or maybe
3618 * both start and end chunk). Read into the
3619 * local buffer then copy over and write back.
William Juul0e8cc8b2007-11-15 11:13:05 +01003620 */
3621
Charles Manning753ac612012-05-09 16:55:17 +00003622 u8 *local_buffer = yaffs_get_temp_buffer(dev);
William Juul0e8cc8b2007-11-15 11:13:05 +01003623
Charles Manning753ac612012-05-09 16:55:17 +00003624 yaffs_rd_data_obj(in, chunk, local_buffer);
3625 memcpy(&local_buffer[start], buffer, n_copy);
William Juul0e8cc8b2007-11-15 11:13:05 +01003626
Charles Manning753ac612012-05-09 16:55:17 +00003627 chunk_written =
3628 yaffs_wr_data_obj(in, chunk,
3629 local_buffer,
3630 n_writeback, 0);
William Juul0e8cc8b2007-11-15 11:13:05 +01003631
Charles Manning753ac612012-05-09 16:55:17 +00003632 yaffs_release_temp_buffer(dev, local_buffer);
William Juul0e8cc8b2007-11-15 11:13:05 +01003633 }
William Juul0e8cc8b2007-11-15 11:13:05 +01003634 } else {
Charles Manning753ac612012-05-09 16:55:17 +00003635 /* A full chunk. Write directly from the buffer. */
William Juul0e8cc8b2007-11-15 11:13:05 +01003636
Charles Manning753ac612012-05-09 16:55:17 +00003637 chunk_written =
3638 yaffs_wr_data_obj(in, chunk, buffer,
3639 dev->data_bytes_per_chunk, 0);
3640
3641 /* Since we've overwritten the cached data,
3642 * we better invalidate it. */
3643 yaffs_invalidate_chunk_cache(in, chunk);
William Juul0e8cc8b2007-11-15 11:13:05 +01003644 }
3645
Charles Manning753ac612012-05-09 16:55:17 +00003646 if (chunk_written >= 0) {
3647 n -= n_copy;
3648 offset += n_copy;
3649 buffer += n_copy;
3650 n_done += n_copy;
William Juul0e8cc8b2007-11-15 11:13:05 +01003651 }
William Juul0e8cc8b2007-11-15 11:13:05 +01003652 }
3653
3654 /* Update file object */
3655
Charles Manning753ac612012-05-09 16:55:17 +00003656 if ((start_write + n_done) > in->variant.file_variant.file_size)
3657 in->variant.file_variant.file_size = (start_write + n_done);
William Juul0e8cc8b2007-11-15 11:13:05 +01003658
3659 in->dirty = 1;
Charles Manning753ac612012-05-09 16:55:17 +00003660 return n_done;
William Juul0e8cc8b2007-11-15 11:13:05 +01003661}
3662
Charles Manning753ac612012-05-09 16:55:17 +00003663int yaffs_wr_file(struct yaffs_obj *in, const u8 *buffer, loff_t offset,
3664 int n_bytes, int write_through)
3665{
3666 yaffs2_handle_hole(in, offset);
3667 return yaffs_do_file_wr(in, buffer, offset, n_bytes, write_through);
3668}
William Juul0e8cc8b2007-11-15 11:13:05 +01003669
3670/* ---------------------- File resizing stuff ------------------ */
3671
Charles Manning753ac612012-05-09 16:55:17 +00003672static void yaffs_prune_chunks(struct yaffs_obj *in, loff_t new_size)
William Juul0e8cc8b2007-11-15 11:13:05 +01003673{
3674
Charles Manning753ac612012-05-09 16:55:17 +00003675 struct yaffs_dev *dev = in->my_dev;
3676 loff_t old_size = in->variant.file_variant.file_size;
William Juul0e8cc8b2007-11-15 11:13:05 +01003677 int i;
Charles Manning753ac612012-05-09 16:55:17 +00003678 int chunk_id;
3679 u32 dummy;
3680 int last_del;
3681 int start_del;
3682
3683 if (old_size > 0)
3684 yaffs_addr_to_chunk(dev, old_size - 1, &last_del, &dummy);
3685 else
3686 last_del = 0;
3687
3688 yaffs_addr_to_chunk(dev, new_size + dev->data_bytes_per_chunk - 1,
3689 &start_del, &dummy);
3690 last_del++;
3691 start_del++;
William Juul0e8cc8b2007-11-15 11:13:05 +01003692
3693 /* Delete backwards so that we don't end up with holes if
3694 * power is lost part-way through the operation.
3695 */
Charles Manning753ac612012-05-09 16:55:17 +00003696 for (i = last_del; i >= start_del; i--) {
William Juul0e8cc8b2007-11-15 11:13:05 +01003697 /* NB this could be optimised somewhat,
3698 * eg. could retrieve the tags and write them without
Charles Manning753ac612012-05-09 16:55:17 +00003699 * using yaffs_chunk_del
William Juul0e8cc8b2007-11-15 11:13:05 +01003700 */
3701
Charles Manning753ac612012-05-09 16:55:17 +00003702 chunk_id = yaffs_find_del_file_chunk(in, i, NULL);
3703
3704 if (chunk_id < 1)
3705 continue;
3706
3707 if (chunk_id <
3708 (dev->internal_start_block * dev->param.chunks_per_block) ||
3709 chunk_id >=
3710 ((dev->internal_end_block + 1) *
3711 dev->param.chunks_per_block)) {
3712 yaffs_trace(YAFFS_TRACE_ALWAYS,
3713 "Found daft chunk_id %d for %d",
3714 chunk_id, i);
3715 } else {
3716 in->n_data_chunks--;
3717 yaffs_chunk_del(dev, chunk_id, 1, __LINE__);
William Juul0e8cc8b2007-11-15 11:13:05 +01003718 }
3719 }
William Juul0e8cc8b2007-11-15 11:13:05 +01003720}
3721
Charles Manning753ac612012-05-09 16:55:17 +00003722void yaffs_resize_file_down(struct yaffs_obj *obj, loff_t new_size)
William Juul0e8cc8b2007-11-15 11:13:05 +01003723{
Charles Manning753ac612012-05-09 16:55:17 +00003724 int new_full;
3725 u32 new_partial;
3726 struct yaffs_dev *dev = obj->my_dev;
William Juul0e8cc8b2007-11-15 11:13:05 +01003727
Charles Manning753ac612012-05-09 16:55:17 +00003728 yaffs_addr_to_chunk(dev, new_size, &new_full, &new_partial);
Wolfgang Denk4b070802008-08-14 14:41:06 +02003729
Charles Manning753ac612012-05-09 16:55:17 +00003730 yaffs_prune_chunks(obj, new_size);
William Juul0e8cc8b2007-11-15 11:13:05 +01003731
Charles Manning753ac612012-05-09 16:55:17 +00003732 if (new_partial != 0) {
3733 int last_chunk = 1 + new_full;
3734 u8 *local_buffer = yaffs_get_temp_buffer(dev);
William Juul0e8cc8b2007-11-15 11:13:05 +01003735
Charles Manning753ac612012-05-09 16:55:17 +00003736 /* Rewrite the last chunk with its new size and zero pad */
3737 yaffs_rd_data_obj(obj, last_chunk, local_buffer);
3738 memset(local_buffer + new_partial, 0,
3739 dev->data_bytes_per_chunk - new_partial);
William Juul0e8cc8b2007-11-15 11:13:05 +01003740
Charles Manning753ac612012-05-09 16:55:17 +00003741 yaffs_wr_data_obj(obj, last_chunk, local_buffer,
3742 new_partial, 1);
William Juul0e8cc8b2007-11-15 11:13:05 +01003743
Charles Manning753ac612012-05-09 16:55:17 +00003744 yaffs_release_temp_buffer(dev, local_buffer);
William Juul0e8cc8b2007-11-15 11:13:05 +01003745 }
3746
Charles Manning753ac612012-05-09 16:55:17 +00003747 obj->variant.file_variant.file_size = new_size;
William Juul0e8cc8b2007-11-15 11:13:05 +01003748
Charles Manning753ac612012-05-09 16:55:17 +00003749 yaffs_prune_tree(dev, &obj->variant.file_variant);
3750}
William Juul0e8cc8b2007-11-15 11:13:05 +01003751
Charles Manning753ac612012-05-09 16:55:17 +00003752int yaffs_resize_file(struct yaffs_obj *in, loff_t new_size)
3753{
3754 struct yaffs_dev *dev = in->my_dev;
3755 loff_t old_size = in->variant.file_variant.file_size;
William Juul0e8cc8b2007-11-15 11:13:05 +01003756
Charles Manning753ac612012-05-09 16:55:17 +00003757 yaffs_flush_file_cache(in);
3758 yaffs_invalidate_whole_cache(in);
Wolfgang Denk4b070802008-08-14 14:41:06 +02003759
Charles Manning753ac612012-05-09 16:55:17 +00003760 yaffs_check_gc(dev, 0);
William Juul0e8cc8b2007-11-15 11:13:05 +01003761
Charles Manning753ac612012-05-09 16:55:17 +00003762 if (in->variant_type != YAFFS_OBJECT_TYPE_FILE)
3763 return YAFFS_FAIL;
William Juul0e8cc8b2007-11-15 11:13:05 +01003764
Charles Manning753ac612012-05-09 16:55:17 +00003765 if (new_size == old_size)
3766 return YAFFS_OK;
William Juul0e8cc8b2007-11-15 11:13:05 +01003767
Charles Manning753ac612012-05-09 16:55:17 +00003768 if (new_size > old_size) {
3769 yaffs2_handle_hole(in, new_size);
3770 in->variant.file_variant.file_size = new_size;
William Juul0e8cc8b2007-11-15 11:13:05 +01003771 } else {
Charles Manning753ac612012-05-09 16:55:17 +00003772 /* new_size < old_size */
3773 yaffs_resize_file_down(in, new_size);
William Juul0e8cc8b2007-11-15 11:13:05 +01003774 }
3775
Charles Manning753ac612012-05-09 16:55:17 +00003776 /* Write a new object header to reflect the resize.
William Juul0e8cc8b2007-11-15 11:13:05 +01003777 * show we've shrunk the file, if need be
Charles Manning753ac612012-05-09 16:55:17 +00003778 * Do this only if the file is not in the deleted directories
3779 * and is not shadowed.
William Juul0e8cc8b2007-11-15 11:13:05 +01003780 */
Charles Manning753ac612012-05-09 16:55:17 +00003781 if (in->parent &&
3782 !in->is_shadowed &&
3783 in->parent->obj_id != YAFFS_OBJECTID_UNLINKED &&
3784 in->parent->obj_id != YAFFS_OBJECTID_DELETED)
3785 yaffs_update_oh(in, NULL, 0, 0, 0, NULL);
William Juul0e8cc8b2007-11-15 11:13:05 +01003786
3787 return YAFFS_OK;
3788}
3789
Charles Manning753ac612012-05-09 16:55:17 +00003790int yaffs_flush_file(struct yaffs_obj *in, int update_time, int data_sync)
William Juul0e8cc8b2007-11-15 11:13:05 +01003791{
Charles Manning753ac612012-05-09 16:55:17 +00003792 if (!in->dirty)
3793 return YAFFS_OK;
William Juul0e8cc8b2007-11-15 11:13:05 +01003794
Charles Manning753ac612012-05-09 16:55:17 +00003795 yaffs_flush_file_cache(in);
3796
3797 if (data_sync)
3798 return YAFFS_OK;
3799
3800 if (update_time)
3801 yaffs_load_current_time(in, 0, 0);
3802
3803 return (yaffs_update_oh(in, NULL, 0, 0, 0, NULL) >= 0) ?
3804 YAFFS_OK : YAFFS_FAIL;
William Juul0e8cc8b2007-11-15 11:13:05 +01003805}
3806
3807
Charles Manning753ac612012-05-09 16:55:17 +00003808/* yaffs_del_file deletes the whole file data
William Juul0e8cc8b2007-11-15 11:13:05 +01003809 * and the inode associated with the file.
3810 * It does not delete the links associated with the file.
3811 */
Charles Manning753ac612012-05-09 16:55:17 +00003812static int yaffs_unlink_file_if_needed(struct yaffs_obj *in)
William Juul0e8cc8b2007-11-15 11:13:05 +01003813{
Charles Manning753ac612012-05-09 16:55:17 +00003814 int ret_val;
3815 int del_now = 0;
3816 struct yaffs_dev *dev = in->my_dev;
William Juul0e8cc8b2007-11-15 11:13:05 +01003817
Charles Manning753ac612012-05-09 16:55:17 +00003818 if (!in->my_inode)
3819 del_now = 1;
William Juul0e8cc8b2007-11-15 11:13:05 +01003820
Charles Manning753ac612012-05-09 16:55:17 +00003821 if (del_now) {
3822 ret_val =
3823 yaffs_change_obj_name(in, in->my_dev->del_dir,
3824 _Y("deleted"), 0, 0);
3825 yaffs_trace(YAFFS_TRACE_TRACING,
3826 "yaffs: immediate deletion of file %d",
3827 in->obj_id);
3828 in->deleted = 1;
3829 in->my_dev->n_deleted_files++;
3830 if (dev->param.disable_soft_del || dev->param.is_yaffs2)
3831 yaffs_resize_file(in, 0);
3832 yaffs_soft_del_file(in);
3833 } else {
3834 ret_val =
3835 yaffs_change_obj_name(in, in->my_dev->unlinked_dir,
3836 _Y("unlinked"), 0, 0);
William Juul0e8cc8b2007-11-15 11:13:05 +01003837 }
Charles Manning753ac612012-05-09 16:55:17 +00003838 return ret_val;
William Juul0e8cc8b2007-11-15 11:13:05 +01003839}
3840
Charles Manning753ac612012-05-09 16:55:17 +00003841int yaffs_del_file(struct yaffs_obj *in)
William Juul0e8cc8b2007-11-15 11:13:05 +01003842{
Charles Manning753ac612012-05-09 16:55:17 +00003843 int ret_val = YAFFS_OK;
3844 int deleted; /* Need to cache value on stack if in is freed */
3845 struct yaffs_dev *dev = in->my_dev;
William Juul0e8cc8b2007-11-15 11:13:05 +01003846
Charles Manning753ac612012-05-09 16:55:17 +00003847 if (dev->param.disable_soft_del || dev->param.is_yaffs2)
3848 yaffs_resize_file(in, 0);
3849
3850 if (in->n_data_chunks > 0) {
3851 /* Use soft deletion if there is data in the file.
3852 * That won't be the case if it has been resized to zero.
3853 */
3854 if (!in->unlinked)
3855 ret_val = yaffs_unlink_file_if_needed(in);
3856
3857 deleted = in->deleted;
3858
3859 if (ret_val == YAFFS_OK && in->unlinked && !in->deleted) {
William Juul0e8cc8b2007-11-15 11:13:05 +01003860 in->deleted = 1;
Charles Manning753ac612012-05-09 16:55:17 +00003861 deleted = 1;
3862 in->my_dev->n_deleted_files++;
3863 yaffs_soft_del_file(in);
William Juul0e8cc8b2007-11-15 11:13:05 +01003864 }
Charles Manning753ac612012-05-09 16:55:17 +00003865 return deleted ? YAFFS_OK : YAFFS_FAIL;
William Juul0e8cc8b2007-11-15 11:13:05 +01003866 } else {
3867 /* The file has no data chunks so we toss it immediately */
Charles Manning753ac612012-05-09 16:55:17 +00003868 yaffs_free_tnode(in->my_dev, in->variant.file_variant.top);
3869 in->variant.file_variant.top = NULL;
3870 yaffs_generic_obj_del(in);
William Juul0e8cc8b2007-11-15 11:13:05 +01003871
3872 return YAFFS_OK;
3873 }
3874}
3875
Charles Manning753ac612012-05-09 16:55:17 +00003876int yaffs_is_non_empty_dir(struct yaffs_obj *obj)
3877{
3878 return (obj &&
3879 obj->variant_type == YAFFS_OBJECT_TYPE_DIRECTORY) &&
3880 !(list_empty(&obj->variant.dir_variant.children));
3881}
3882
3883static int yaffs_del_dir(struct yaffs_obj *obj)
William Juul0e8cc8b2007-11-15 11:13:05 +01003884{
3885 /* First check that the directory is empty. */
Charles Manning753ac612012-05-09 16:55:17 +00003886 if (yaffs_is_non_empty_dir(obj))
3887 return YAFFS_FAIL;
William Juul0e8cc8b2007-11-15 11:13:05 +01003888
Charles Manning753ac612012-05-09 16:55:17 +00003889 return yaffs_generic_obj_del(obj);
William Juul0e8cc8b2007-11-15 11:13:05 +01003890}
3891
Charles Manning753ac612012-05-09 16:55:17 +00003892static int yaffs_del_symlink(struct yaffs_obj *in)
William Juul0e8cc8b2007-11-15 11:13:05 +01003893{
Charles Manning753ac612012-05-09 16:55:17 +00003894 kfree(in->variant.symlink_variant.alias);
3895 in->variant.symlink_variant.alias = NULL;
William Juul0e8cc8b2007-11-15 11:13:05 +01003896
Charles Manning753ac612012-05-09 16:55:17 +00003897 return yaffs_generic_obj_del(in);
William Juul0e8cc8b2007-11-15 11:13:05 +01003898}
3899
Charles Manning753ac612012-05-09 16:55:17 +00003900static int yaffs_del_link(struct yaffs_obj *in)
William Juul0e8cc8b2007-11-15 11:13:05 +01003901{
Charles Manning753ac612012-05-09 16:55:17 +00003902 /* remove this hardlink from the list associated with the equivalent
William Juul0e8cc8b2007-11-15 11:13:05 +01003903 * object
3904 */
Charles Manning753ac612012-05-09 16:55:17 +00003905 list_del_init(&in->hard_links);
3906 return yaffs_generic_obj_del(in);
William Juul0e8cc8b2007-11-15 11:13:05 +01003907}
3908
Charles Manning753ac612012-05-09 16:55:17 +00003909int yaffs_del_obj(struct yaffs_obj *obj)
William Juul0e8cc8b2007-11-15 11:13:05 +01003910{
Charles Manning753ac612012-05-09 16:55:17 +00003911 int ret_val = -1;
3912
3913 switch (obj->variant_type) {
William Juul0e8cc8b2007-11-15 11:13:05 +01003914 case YAFFS_OBJECT_TYPE_FILE:
Charles Manning753ac612012-05-09 16:55:17 +00003915 ret_val = yaffs_del_file(obj);
William Juul0e8cc8b2007-11-15 11:13:05 +01003916 break;
3917 case YAFFS_OBJECT_TYPE_DIRECTORY:
Charles Manning753ac612012-05-09 16:55:17 +00003918 if (!list_empty(&obj->variant.dir_variant.dirty)) {
3919 yaffs_trace(YAFFS_TRACE_BACKGROUND,
3920 "Remove object %d from dirty directories",
3921 obj->obj_id);
3922 list_del_init(&obj->variant.dir_variant.dirty);
3923 }
3924 return yaffs_del_dir(obj);
William Juul0e8cc8b2007-11-15 11:13:05 +01003925 break;
3926 case YAFFS_OBJECT_TYPE_SYMLINK:
Charles Manning753ac612012-05-09 16:55:17 +00003927 ret_val = yaffs_del_symlink(obj);
William Juul0e8cc8b2007-11-15 11:13:05 +01003928 break;
3929 case YAFFS_OBJECT_TYPE_HARDLINK:
Charles Manning753ac612012-05-09 16:55:17 +00003930 ret_val = yaffs_del_link(obj);
William Juul0e8cc8b2007-11-15 11:13:05 +01003931 break;
3932 case YAFFS_OBJECT_TYPE_SPECIAL:
Charles Manning753ac612012-05-09 16:55:17 +00003933 ret_val = yaffs_generic_obj_del(obj);
William Juul0e8cc8b2007-11-15 11:13:05 +01003934 break;
3935 case YAFFS_OBJECT_TYPE_UNKNOWN:
Charles Manning753ac612012-05-09 16:55:17 +00003936 ret_val = 0;
William Juul0e8cc8b2007-11-15 11:13:05 +01003937 break; /* should not happen. */
3938 }
Charles Manning753ac612012-05-09 16:55:17 +00003939 return ret_val;
William Juul0e8cc8b2007-11-15 11:13:05 +01003940}
3941
Charles Manning753ac612012-05-09 16:55:17 +00003942static int yaffs_unlink_worker(struct yaffs_obj *obj)
William Juul0e8cc8b2007-11-15 11:13:05 +01003943{
Charles Manning753ac612012-05-09 16:55:17 +00003944 int del_now = 0;
William Juul0e8cc8b2007-11-15 11:13:05 +01003945
Charles Manning753ac612012-05-09 16:55:17 +00003946 if (!obj)
3947 return YAFFS_FAIL;
3948
3949 if (!obj->my_inode)
3950 del_now = 1;
3951
3952 yaffs_update_parent(obj->parent);
3953
3954 if (obj->variant_type == YAFFS_OBJECT_TYPE_HARDLINK) {
3955 return yaffs_del_link(obj);
3956 } else if (!list_empty(&obj->hard_links)) {
William Juul0e8cc8b2007-11-15 11:13:05 +01003957 /* Curve ball: We're unlinking an object that has a hardlink.
3958 *
3959 * This problem arises because we are not strictly following
3960 * The Linux link/inode model.
3961 *
3962 * We can't really delete the object.
3963 * Instead, we do the following:
3964 * - Select a hardlink.
3965 * - Unhook it from the hard links
Charles Manning753ac612012-05-09 16:55:17 +00003966 * - Move it from its parent directory so that the rename works.
William Juul0e8cc8b2007-11-15 11:13:05 +01003967 * - Rename the object to the hardlink's name.
3968 * - Delete the hardlink
3969 */
3970
Charles Manning753ac612012-05-09 16:55:17 +00003971 struct yaffs_obj *hl;
3972 struct yaffs_obj *parent;
3973 int ret_val;
William Juul0e8cc8b2007-11-15 11:13:05 +01003974 YCHAR name[YAFFS_MAX_NAME_LENGTH + 1];
3975
Charles Manning753ac612012-05-09 16:55:17 +00003976 hl = list_entry(obj->hard_links.next, struct yaffs_obj,
3977 hard_links);
William Juul0e8cc8b2007-11-15 11:13:05 +01003978
Charles Manning753ac612012-05-09 16:55:17 +00003979 yaffs_get_obj_name(hl, name, YAFFS_MAX_NAME_LENGTH + 1);
3980 parent = hl->parent;
William Juul0e8cc8b2007-11-15 11:13:05 +01003981
Charles Manning753ac612012-05-09 16:55:17 +00003982 list_del_init(&hl->hard_links);
William Juul0e8cc8b2007-11-15 11:13:05 +01003983
Charles Manning753ac612012-05-09 16:55:17 +00003984 yaffs_add_obj_to_dir(obj->my_dev->unlinked_dir, hl);
William Juul0e8cc8b2007-11-15 11:13:05 +01003985
Charles Manning753ac612012-05-09 16:55:17 +00003986 ret_val = yaffs_change_obj_name(obj, parent, name, 0, 0);
William Juul0e8cc8b2007-11-15 11:13:05 +01003987
Charles Manning753ac612012-05-09 16:55:17 +00003988 if (ret_val == YAFFS_OK)
3989 ret_val = yaffs_generic_obj_del(hl);
3990
3991 return ret_val;
3992
3993 } else if (del_now) {
3994 switch (obj->variant_type) {
William Juul0e8cc8b2007-11-15 11:13:05 +01003995 case YAFFS_OBJECT_TYPE_FILE:
Charles Manning753ac612012-05-09 16:55:17 +00003996 return yaffs_del_file(obj);
William Juul0e8cc8b2007-11-15 11:13:05 +01003997 break;
3998 case YAFFS_OBJECT_TYPE_DIRECTORY:
Charles Manning753ac612012-05-09 16:55:17 +00003999 list_del_init(&obj->variant.dir_variant.dirty);
4000 return yaffs_del_dir(obj);
William Juul0e8cc8b2007-11-15 11:13:05 +01004001 break;
4002 case YAFFS_OBJECT_TYPE_SYMLINK:
Charles Manning753ac612012-05-09 16:55:17 +00004003 return yaffs_del_symlink(obj);
William Juul0e8cc8b2007-11-15 11:13:05 +01004004 break;
4005 case YAFFS_OBJECT_TYPE_SPECIAL:
Charles Manning753ac612012-05-09 16:55:17 +00004006 return yaffs_generic_obj_del(obj);
William Juul0e8cc8b2007-11-15 11:13:05 +01004007 break;
4008 case YAFFS_OBJECT_TYPE_HARDLINK:
4009 case YAFFS_OBJECT_TYPE_UNKNOWN:
4010 default:
4011 return YAFFS_FAIL;
4012 }
Charles Manning753ac612012-05-09 16:55:17 +00004013 } else if (yaffs_is_non_empty_dir(obj)) {
4014 return YAFFS_FAIL;
4015 } else {
4016 return yaffs_change_obj_name(obj, obj->my_dev->unlinked_dir,
4017 _Y("unlinked"), 0, 0);
William Juul0e8cc8b2007-11-15 11:13:05 +01004018 }
4019}
4020
Charles Manning753ac612012-05-09 16:55:17 +00004021static int yaffs_unlink_obj(struct yaffs_obj *obj)
William Juul0e8cc8b2007-11-15 11:13:05 +01004022{
Charles Manning753ac612012-05-09 16:55:17 +00004023 if (obj && obj->unlink_allowed)
4024 return yaffs_unlink_worker(obj);
William Juul0e8cc8b2007-11-15 11:13:05 +01004025
4026 return YAFFS_FAIL;
William Juul0e8cc8b2007-11-15 11:13:05 +01004027}
William Juul0e8cc8b2007-11-15 11:13:05 +01004028
Charles Manning753ac612012-05-09 16:55:17 +00004029int yaffs_unlinker(struct yaffs_obj *dir, const YCHAR *name)
4030{
4031 struct yaffs_obj *obj;
4032
4033 obj = yaffs_find_by_name(dir, name);
4034 return yaffs_unlink_obj(obj);
4035}
4036
4037/* Note:
4038 * If old_name is NULL then we take old_dir as the object to be renamed.
4039 */
4040int yaffs_rename_obj(struct yaffs_obj *old_dir, const YCHAR *old_name,
4041 struct yaffs_obj *new_dir, const YCHAR *new_name)
4042{
4043 struct yaffs_obj *obj = NULL;
4044 struct yaffs_obj *existing_target = NULL;
4045 int force = 0;
4046 int result;
4047 struct yaffs_dev *dev;
4048
4049 if (!old_dir || old_dir->variant_type != YAFFS_OBJECT_TYPE_DIRECTORY) {
4050 BUG();
4051 return YAFFS_FAIL;
4052 }
4053 if (!new_dir || new_dir->variant_type != YAFFS_OBJECT_TYPE_DIRECTORY) {
4054 BUG();
4055 return YAFFS_FAIL;
4056 }
4057
4058 dev = old_dir->my_dev;
4059
4060#ifdef CONFIG_YAFFS_CASE_INSENSITIVE
4061 /* Special case for case insemsitive systems.
4062 * While look-up is case insensitive, the name isn't.
4063 * Therefore we might want to change x.txt to X.txt
4064 */
4065 if (old_dir == new_dir &&
4066 old_name && new_name &&
4067 yaffs_strcmp(old_name, new_name) == 0)
4068 force = 1;
4069#endif
4070
4071 if (yaffs_strnlen(new_name, YAFFS_MAX_NAME_LENGTH + 1) >
4072 YAFFS_MAX_NAME_LENGTH)
4073 /* ENAMETOOLONG */
4074 return YAFFS_FAIL;
4075
4076 if (old_name)
4077 obj = yaffs_find_by_name(old_dir, old_name);
4078 else{
4079 obj = old_dir;
4080 old_dir = obj->parent;
4081 }
4082
4083 if (obj && obj->rename_allowed) {
4084 /* Now handle an existing target, if there is one */
4085 existing_target = yaffs_find_by_name(new_dir, new_name);
4086 if (yaffs_is_non_empty_dir(existing_target)) {
4087 return YAFFS_FAIL; /* ENOTEMPTY */
4088 } else if (existing_target && existing_target != obj) {
4089 /* Nuke the target first, using shadowing,
4090 * but only if it isn't the same object.
4091 *
4092 * Note we must disable gc here otherwise it can mess
4093 * up the shadowing.
4094 *
4095 */
4096 dev->gc_disable = 1;
4097 yaffs_change_obj_name(obj, new_dir, new_name, force,
4098 existing_target->obj_id);
4099 existing_target->is_shadowed = 1;
4100 yaffs_unlink_obj(existing_target);
4101 dev->gc_disable = 0;
4102 }
4103
4104 result = yaffs_change_obj_name(obj, new_dir, new_name, 1, 0);
4105
4106 yaffs_update_parent(old_dir);
4107 if (new_dir != old_dir)
4108 yaffs_update_parent(new_dir);
4109
4110 return result;
4111 }
4112 return YAFFS_FAIL;
William Juul0e8cc8b2007-11-15 11:13:05 +01004113}
4114
4115/*----------------------- Initialisation Scanning ---------------------- */
4116
Charles Manning753ac612012-05-09 16:55:17 +00004117void yaffs_handle_shadowed_obj(struct yaffs_dev *dev, int obj_id,
4118 int backward_scanning)
William Juul0e8cc8b2007-11-15 11:13:05 +01004119{
Charles Manning753ac612012-05-09 16:55:17 +00004120 struct yaffs_obj *obj;
William Juul0e8cc8b2007-11-15 11:13:05 +01004121
Charles Manning753ac612012-05-09 16:55:17 +00004122 if (backward_scanning) {
William Juul0e8cc8b2007-11-15 11:13:05 +01004123 /* Handle YAFFS2 case (backward scanning)
4124 * If the shadowed object exists then ignore.
4125 */
Charles Manning753ac612012-05-09 16:55:17 +00004126 obj = yaffs_find_by_number(dev, obj_id);
4127 if (obj)
William Juul0e8cc8b2007-11-15 11:13:05 +01004128 return;
William Juul0e8cc8b2007-11-15 11:13:05 +01004129 }
4130
Charles Manning753ac612012-05-09 16:55:17 +00004131 /* Let's create it (if it does not exist) assuming it is a file so that
4132 * it can do shrinking etc.
William Juul0e8cc8b2007-11-15 11:13:05 +01004133 * We put it in unlinked dir to be cleaned up after the scanning
4134 */
4135 obj =
Charles Manning753ac612012-05-09 16:55:17 +00004136 yaffs_find_or_create_by_number(dev, obj_id, YAFFS_OBJECT_TYPE_FILE);
4137 if (!obj)
4138 return;
4139 obj->is_shadowed = 1;
4140 yaffs_add_obj_to_dir(dev->unlinked_dir, obj);
4141 obj->variant.file_variant.shrink_size = 0;
4142 obj->valid = 1; /* So that we don't read any other info. */
William Juul0e8cc8b2007-11-15 11:13:05 +01004143}
4144
Charles Manning753ac612012-05-09 16:55:17 +00004145void yaffs_link_fixup(struct yaffs_dev *dev, struct list_head *hard_list)
William Juul0e8cc8b2007-11-15 11:13:05 +01004146{
Charles Manning753ac612012-05-09 16:55:17 +00004147 struct list_head *lh;
4148 struct list_head *save;
4149 struct yaffs_obj *hl;
4150 struct yaffs_obj *in;
Wolfgang Denk4b070802008-08-14 14:41:06 +02004151
Charles Manning753ac612012-05-09 16:55:17 +00004152 list_for_each_safe(lh, save, hard_list) {
4153 hl = list_entry(lh, struct yaffs_obj, hard_links);
4154 in = yaffs_find_by_number(dev,
4155 hl->variant.hardlink_variant.equiv_id);
William Juul0e8cc8b2007-11-15 11:13:05 +01004156
4157 if (in) {
4158 /* Add the hardlink pointers */
Charles Manning753ac612012-05-09 16:55:17 +00004159 hl->variant.hardlink_variant.equiv_obj = in;
4160 list_add(&hl->hard_links, &in->hard_links);
William Juul0e8cc8b2007-11-15 11:13:05 +01004161 } else {
4162 /* Todo Need to report/handle this better.
4163 * Got a problem... hardlink to a non-existant object
4164 */
Charles Manning753ac612012-05-09 16:55:17 +00004165 hl->variant.hardlink_variant.equiv_obj = NULL;
4166 INIT_LIST_HEAD(&hl->hard_links);
William Juul0e8cc8b2007-11-15 11:13:05 +01004167 }
William Juul0e8cc8b2007-11-15 11:13:05 +01004168 }
William Juul0e8cc8b2007-11-15 11:13:05 +01004169}
4170
Charles Manning753ac612012-05-09 16:55:17 +00004171static void yaffs_strip_deleted_objs(struct yaffs_dev *dev)
William Juul0e8cc8b2007-11-15 11:13:05 +01004172{
Charles Manning753ac612012-05-09 16:55:17 +00004173 /*
4174 * Sort out state of unlinked and deleted objects after scanning.
William Juul0e8cc8b2007-11-15 11:13:05 +01004175 */
Charles Manning753ac612012-05-09 16:55:17 +00004176 struct list_head *i;
4177 struct list_head *n;
4178 struct yaffs_obj *l;
William Juul0e8cc8b2007-11-15 11:13:05 +01004179
Charles Manning753ac612012-05-09 16:55:17 +00004180 if (dev->read_only)
William Juul0e8cc8b2007-11-15 11:13:05 +01004181 return;
Wolfgang Denk4b070802008-08-14 14:41:06 +02004182
Charles Manning753ac612012-05-09 16:55:17 +00004183 /* Soft delete all the unlinked files */
4184 list_for_each_safe(i, n,
4185 &dev->unlinked_dir->variant.dir_variant.children) {
4186 l = list_entry(i, struct yaffs_obj, siblings);
4187 yaffs_del_obj(l);
4188 }
William Juul0e8cc8b2007-11-15 11:13:05 +01004189
Charles Manning753ac612012-05-09 16:55:17 +00004190 list_for_each_safe(i, n, &dev->del_dir->variant.dir_variant.children) {
4191 l = list_entry(i, struct yaffs_obj, siblings);
4192 yaffs_del_obj(l);
William Juul0e8cc8b2007-11-15 11:13:05 +01004193 }
4194}
4195
Charles Manning753ac612012-05-09 16:55:17 +00004196/*
4197 * This code iterates through all the objects making sure that they are rooted.
4198 * Any unrooted objects are re-rooted in lost+found.
4199 * An object needs to be in one of:
4200 * - Directly under deleted, unlinked
4201 * - Directly or indirectly under root.
4202 *
4203 * Note:
4204 * This code assumes that we don't ever change the current relationships
4205 * between directories:
4206 * root_dir->parent == unlinked_dir->parent == del_dir->parent == NULL
4207 * lost-n-found->parent == root_dir
4208 *
4209 * This fixes the problem where directories might have inadvertently been
4210 * deleted leaving the object "hanging" without being rooted in the
4211 * directory tree.
4212 */
4213
4214static int yaffs_has_null_parent(struct yaffs_dev *dev, struct yaffs_obj *obj)
William Juul0e8cc8b2007-11-15 11:13:05 +01004215{
Charles Manning753ac612012-05-09 16:55:17 +00004216 return (obj == dev->del_dir ||
4217 obj == dev->unlinked_dir || obj == dev->root_dir);
4218}
William Juul0e8cc8b2007-11-15 11:13:05 +01004219
Charles Manning753ac612012-05-09 16:55:17 +00004220static void yaffs_fix_hanging_objs(struct yaffs_dev *dev)
4221{
4222 struct yaffs_obj *obj;
4223 struct yaffs_obj *parent;
4224 int i;
4225 struct list_head *lh;
4226 struct list_head *n;
4227 int depth_limit;
4228 int hanging;
Wolfgang Denk4b070802008-08-14 14:41:06 +02004229
Charles Manning753ac612012-05-09 16:55:17 +00004230 if (dev->read_only)
4231 return;
Wolfgang Denk4b070802008-08-14 14:41:06 +02004232
Charles Manning753ac612012-05-09 16:55:17 +00004233 /* Iterate through the objects in each hash entry,
4234 * looking at each object.
4235 * Make sure it is rooted.
William Juul0e8cc8b2007-11-15 11:13:05 +01004236 */
Wolfgang Denk4b070802008-08-14 14:41:06 +02004237
Charles Manning753ac612012-05-09 16:55:17 +00004238 for (i = 0; i < YAFFS_NOBJECT_BUCKETS; i++) {
4239 list_for_each_safe(lh, n, &dev->obj_bucket[i].list) {
4240 obj = list_entry(lh, struct yaffs_obj, hash_link);
4241 parent = obj->parent;
Wolfgang Denk4b070802008-08-14 14:41:06 +02004242
Charles Manning753ac612012-05-09 16:55:17 +00004243 if (yaffs_has_null_parent(dev, obj)) {
4244 /* These directories are not hanging */
4245 hanging = 0;
4246 } else if (!parent ||
4247 parent->variant_type !=
4248 YAFFS_OBJECT_TYPE_DIRECTORY) {
4249 hanging = 1;
4250 } else if (yaffs_has_null_parent(dev, parent)) {
4251 hanging = 0;
4252 } else {
4253 /*
4254 * Need to follow the parent chain to
4255 * see if it is hanging.
4256 */
4257 hanging = 0;
4258 depth_limit = 100;
William Juul0e8cc8b2007-11-15 11:13:05 +01004259
Charles Manning753ac612012-05-09 16:55:17 +00004260 while (parent != dev->root_dir &&
4261 parent->parent &&
4262 parent->parent->variant_type ==
4263 YAFFS_OBJECT_TYPE_DIRECTORY &&
4264 depth_limit > 0) {
4265 parent = parent->parent;
4266 depth_limit--;
4267 }
4268 if (parent != dev->root_dir)
4269 hanging = 1;
William Juul0e8cc8b2007-11-15 11:13:05 +01004270 }
Charles Manning753ac612012-05-09 16:55:17 +00004271 if (hanging) {
4272 yaffs_trace(YAFFS_TRACE_SCAN,
4273 "Hanging object %d moved to lost and found",
4274 obj->obj_id);
4275 yaffs_add_obj_to_dir(dev->lost_n_found, obj);
William Juul0e8cc8b2007-11-15 11:13:05 +01004276 }
4277 }
4278 }
William Juul0e8cc8b2007-11-15 11:13:05 +01004279}
4280
Charles Manning753ac612012-05-09 16:55:17 +00004281/*
4282 * Delete directory contents for cleaning up lost and found.
4283 */
4284static void yaffs_del_dir_contents(struct yaffs_obj *dir)
William Juul0e8cc8b2007-11-15 11:13:05 +01004285{
Charles Manning753ac612012-05-09 16:55:17 +00004286 struct yaffs_obj *obj;
4287 struct list_head *lh;
4288 struct list_head *n;
Wolfgang Denk4b070802008-08-14 14:41:06 +02004289
Charles Manning753ac612012-05-09 16:55:17 +00004290 if (dir->variant_type != YAFFS_OBJECT_TYPE_DIRECTORY)
4291 BUG();
Wolfgang Denk4b070802008-08-14 14:41:06 +02004292
Charles Manning753ac612012-05-09 16:55:17 +00004293 list_for_each_safe(lh, n, &dir->variant.dir_variant.children) {
4294 obj = list_entry(lh, struct yaffs_obj, siblings);
4295 if (obj->variant_type == YAFFS_OBJECT_TYPE_DIRECTORY)
4296 yaffs_del_dir_contents(obj);
4297 yaffs_trace(YAFFS_TRACE_SCAN,
4298 "Deleting lost_found object %d",
4299 obj->obj_id);
4300 yaffs_unlink_obj(obj);
4301 }
William Juul0e8cc8b2007-11-15 11:13:05 +01004302}
4303
Charles Manning753ac612012-05-09 16:55:17 +00004304static void yaffs_empty_l_n_f(struct yaffs_dev *dev)
William Juul0e8cc8b2007-11-15 11:13:05 +01004305{
Charles Manning753ac612012-05-09 16:55:17 +00004306 yaffs_del_dir_contents(dev->lost_n_found);
William Juul0e8cc8b2007-11-15 11:13:05 +01004307}
4308
Charles Manning753ac612012-05-09 16:55:17 +00004309
4310struct yaffs_obj *yaffs_find_by_name(struct yaffs_obj *directory,
4311 const YCHAR *name)
William Juul0e8cc8b2007-11-15 11:13:05 +01004312{
4313 int sum;
William Juul0e8cc8b2007-11-15 11:13:05 +01004314 struct list_head *i;
4315 YCHAR buffer[YAFFS_MAX_NAME_LENGTH + 1];
Charles Manning753ac612012-05-09 16:55:17 +00004316 struct yaffs_obj *l;
William Juul0e8cc8b2007-11-15 11:13:05 +01004317
Charles Manning753ac612012-05-09 16:55:17 +00004318 if (!name)
William Juul0e8cc8b2007-11-15 11:13:05 +01004319 return NULL;
William Juul0e8cc8b2007-11-15 11:13:05 +01004320
4321 if (!directory) {
Charles Manning753ac612012-05-09 16:55:17 +00004322 yaffs_trace(YAFFS_TRACE_ALWAYS,
4323 "tragedy: yaffs_find_by_name: null pointer directory"
4324 );
4325 BUG();
4326 return NULL;
William Juul0e8cc8b2007-11-15 11:13:05 +01004327 }
Charles Manning753ac612012-05-09 16:55:17 +00004328 if (directory->variant_type != YAFFS_OBJECT_TYPE_DIRECTORY) {
4329 yaffs_trace(YAFFS_TRACE_ALWAYS,
4330 "tragedy: yaffs_find_by_name: non-directory"
4331 );
4332 BUG();
William Juul0e8cc8b2007-11-15 11:13:05 +01004333 }
4334
Charles Manning753ac612012-05-09 16:55:17 +00004335 sum = yaffs_calc_name_sum(name);
William Juul0e8cc8b2007-11-15 11:13:05 +01004336
Charles Manning753ac612012-05-09 16:55:17 +00004337 list_for_each(i, &directory->variant.dir_variant.children) {
4338 l = list_entry(i, struct yaffs_obj, siblings);
Wolfgang Denk4b070802008-08-14 14:41:06 +02004339
Charles Manning753ac612012-05-09 16:55:17 +00004340 if (l->parent != directory)
4341 BUG();
William Juul0e8cc8b2007-11-15 11:13:05 +01004342
Charles Manning753ac612012-05-09 16:55:17 +00004343 yaffs_check_obj_details_loaded(l);
William Juul0e8cc8b2007-11-15 11:13:05 +01004344
Charles Manning753ac612012-05-09 16:55:17 +00004345 /* Special case for lost-n-found */
4346 if (l->obj_id == YAFFS_OBJECTID_LOSTNFOUND) {
4347 if (!yaffs_strcmp(name, YAFFS_LOSTNFOUND_NAME))
4348 return l;
4349 } else if (l->sum == sum || l->hdr_chunk <= 0) {
4350 /* LostnFound chunk called Objxxx
4351 * Do a real check
4352 */
4353 yaffs_get_obj_name(l, buffer,
4354 YAFFS_MAX_NAME_LENGTH + 1);
4355 if (!yaffs_strncmp(name, buffer, YAFFS_MAX_NAME_LENGTH))
4356 return l;
William Juul0e8cc8b2007-11-15 11:13:05 +01004357 }
4358 }
William Juul0e8cc8b2007-11-15 11:13:05 +01004359 return NULL;
4360}
4361
William Juul0e8cc8b2007-11-15 11:13:05 +01004362/* GetEquivalentObject dereferences any hard links to get to the
4363 * actual object.
4364 */
4365
Charles Manning753ac612012-05-09 16:55:17 +00004366struct yaffs_obj *yaffs_get_equivalent_obj(struct yaffs_obj *obj)
William Juul0e8cc8b2007-11-15 11:13:05 +01004367{
Charles Manning753ac612012-05-09 16:55:17 +00004368 if (obj && obj->variant_type == YAFFS_OBJECT_TYPE_HARDLINK) {
4369 obj = obj->variant.hardlink_variant.equiv_obj;
4370 yaffs_check_obj_details_loaded(obj);
William Juul0e8cc8b2007-11-15 11:13:05 +01004371 }
4372 return obj;
William Juul0e8cc8b2007-11-15 11:13:05 +01004373}
4374
Charles Manning753ac612012-05-09 16:55:17 +00004375/*
4376 * A note or two on object names.
4377 * * If the object name is missing, we then make one up in the form objnnn
4378 *
4379 * * ASCII names are stored in the object header's name field from byte zero
4380 * * Unicode names are historically stored starting from byte zero.
4381 *
4382 * Then there are automatic Unicode names...
4383 * The purpose of these is to save names in a way that can be read as
4384 * ASCII or Unicode names as appropriate, thus allowing a Unicode and ASCII
4385 * system to share files.
4386 *
4387 * These automatic unicode are stored slightly differently...
4388 * - If the name can fit in the ASCII character space then they are saved as
4389 * ascii names as per above.
4390 * - If the name needs Unicode then the name is saved in Unicode
4391 * starting at oh->name[1].
4392
4393 */
4394static void yaffs_fix_null_name(struct yaffs_obj *obj, YCHAR *name,
4395 int buffer_size)
William Juul0e8cc8b2007-11-15 11:13:05 +01004396{
Charles Manning753ac612012-05-09 16:55:17 +00004397 /* Create an object name if we could not find one. */
4398 if (yaffs_strnlen(name, YAFFS_MAX_NAME_LENGTH) == 0) {
4399 YCHAR local_name[20];
4400 YCHAR num_string[20];
4401 YCHAR *x = &num_string[19];
4402 unsigned v = obj->obj_id;
4403 num_string[19] = 0;
4404 while (v > 0) {
4405 x--;
4406 *x = '0' + (v % 10);
4407 v /= 10;
William Juul0e8cc8b2007-11-15 11:13:05 +01004408 }
Charles Manning753ac612012-05-09 16:55:17 +00004409 /* make up a name */
4410 yaffs_strcpy(local_name, YAFFS_LOSTNFOUND_PREFIX);
4411 yaffs_strcat(local_name, x);
4412 yaffs_strncpy(name, local_name, buffer_size - 1);
William Juul0e8cc8b2007-11-15 11:13:05 +01004413 }
William Juul0e8cc8b2007-11-15 11:13:05 +01004414}
4415
Charles Manning753ac612012-05-09 16:55:17 +00004416int yaffs_get_obj_name(struct yaffs_obj *obj, YCHAR *name, int buffer_size)
William Juul0e8cc8b2007-11-15 11:13:05 +01004417{
Charles Manning753ac612012-05-09 16:55:17 +00004418 memset(name, 0, buffer_size * sizeof(YCHAR));
4419 yaffs_check_obj_details_loaded(obj);
4420 if (obj->obj_id == YAFFS_OBJECTID_LOSTNFOUND) {
4421 yaffs_strncpy(name, YAFFS_LOSTNFOUND_NAME, buffer_size - 1);
4422 } else if (obj->short_name[0]) {
4423 yaffs_strcpy(name, obj->short_name);
4424 } else if (obj->hdr_chunk > 0) {
Charles Manning753ac612012-05-09 16:55:17 +00004425 u8 *buffer = yaffs_get_temp_buffer(obj->my_dev);
William Juul0e8cc8b2007-11-15 11:13:05 +01004426
Charles Manning753ac612012-05-09 16:55:17 +00004427 struct yaffs_obj_hdr *oh = (struct yaffs_obj_hdr *)buffer;
William Juul0e8cc8b2007-11-15 11:13:05 +01004428
Charles Manning753ac612012-05-09 16:55:17 +00004429 memset(buffer, 0, obj->my_dev->data_bytes_per_chunk);
4430
4431 if (obj->hdr_chunk > 0) {
Anatolij Gustschin8cc64ba2012-10-05 23:31:03 +00004432 yaffs_rd_chunk_tags_nand(obj->my_dev,
4433 obj->hdr_chunk,
4434 buffer, NULL);
Charles Manning753ac612012-05-09 16:55:17 +00004435 }
4436 yaffs_load_name_from_oh(obj->my_dev, name, oh->name,
4437 buffer_size);
4438
4439 yaffs_release_temp_buffer(obj->my_dev, buffer);
William Juul0e8cc8b2007-11-15 11:13:05 +01004440 }
Charles Manning753ac612012-05-09 16:55:17 +00004441
4442 yaffs_fix_null_name(obj, name, buffer_size);
4443
4444 return yaffs_strnlen(name, YAFFS_MAX_NAME_LENGTH);
4445}
4446
4447loff_t yaffs_get_obj_length(struct yaffs_obj *obj)
4448{
4449 /* Dereference any hard linking */
4450 obj = yaffs_get_equivalent_obj(obj);
4451
4452 if (obj->variant_type == YAFFS_OBJECT_TYPE_FILE)
4453 return obj->variant.file_variant.file_size;
4454 if (obj->variant_type == YAFFS_OBJECT_TYPE_SYMLINK) {
4455 if (!obj->variant.symlink_variant.alias)
4456 return 0;
4457 return yaffs_strnlen(obj->variant.symlink_variant.alias,
4458 YAFFS_MAX_ALIAS_LENGTH);
William Juul0e8cc8b2007-11-15 11:13:05 +01004459 } else {
4460 /* Only a directory should drop through to here */
Charles Manning753ac612012-05-09 16:55:17 +00004461 return obj->my_dev->data_bytes_per_chunk;
William Juul0e8cc8b2007-11-15 11:13:05 +01004462 }
4463}
4464
Charles Manning753ac612012-05-09 16:55:17 +00004465int yaffs_get_obj_link_count(struct yaffs_obj *obj)
William Juul0e8cc8b2007-11-15 11:13:05 +01004466{
4467 int count = 0;
4468 struct list_head *i;
4469
Charles Manning753ac612012-05-09 16:55:17 +00004470 if (!obj->unlinked)
William Juul0e8cc8b2007-11-15 11:13:05 +01004471 count++; /* the object itself */
Charles Manning753ac612012-05-09 16:55:17 +00004472
4473 list_for_each(i, &obj->hard_links)
4474 count++; /* add the hard links; */
4475
William Juul0e8cc8b2007-11-15 11:13:05 +01004476 return count;
William Juul0e8cc8b2007-11-15 11:13:05 +01004477}
4478
Charles Manning753ac612012-05-09 16:55:17 +00004479int yaffs_get_obj_inode(struct yaffs_obj *obj)
William Juul0e8cc8b2007-11-15 11:13:05 +01004480{
Charles Manning753ac612012-05-09 16:55:17 +00004481 obj = yaffs_get_equivalent_obj(obj);
William Juul0e8cc8b2007-11-15 11:13:05 +01004482
Charles Manning753ac612012-05-09 16:55:17 +00004483 return obj->obj_id;
William Juul0e8cc8b2007-11-15 11:13:05 +01004484}
4485
Charles Manning753ac612012-05-09 16:55:17 +00004486unsigned yaffs_get_obj_type(struct yaffs_obj *obj)
William Juul0e8cc8b2007-11-15 11:13:05 +01004487{
Charles Manning753ac612012-05-09 16:55:17 +00004488 obj = yaffs_get_equivalent_obj(obj);
William Juul0e8cc8b2007-11-15 11:13:05 +01004489
Charles Manning753ac612012-05-09 16:55:17 +00004490 switch (obj->variant_type) {
William Juul0e8cc8b2007-11-15 11:13:05 +01004491 case YAFFS_OBJECT_TYPE_FILE:
4492 return DT_REG;
4493 break;
4494 case YAFFS_OBJECT_TYPE_DIRECTORY:
4495 return DT_DIR;
4496 break;
4497 case YAFFS_OBJECT_TYPE_SYMLINK:
4498 return DT_LNK;
4499 break;
4500 case YAFFS_OBJECT_TYPE_HARDLINK:
4501 return DT_REG;
4502 break;
4503 case YAFFS_OBJECT_TYPE_SPECIAL:
4504 if (S_ISFIFO(obj->yst_mode))
4505 return DT_FIFO;
4506 if (S_ISCHR(obj->yst_mode))
4507 return DT_CHR;
4508 if (S_ISBLK(obj->yst_mode))
4509 return DT_BLK;
4510 if (S_ISSOCK(obj->yst_mode))
4511 return DT_SOCK;
Charles Manning753ac612012-05-09 16:55:17 +00004512 return DT_REG;
4513 break;
William Juul0e8cc8b2007-11-15 11:13:05 +01004514 default:
4515 return DT_REG;
4516 break;
4517 }
4518}
4519
Charles Manning753ac612012-05-09 16:55:17 +00004520YCHAR *yaffs_get_symlink_alias(struct yaffs_obj *obj)
William Juul0e8cc8b2007-11-15 11:13:05 +01004521{
Charles Manning753ac612012-05-09 16:55:17 +00004522 obj = yaffs_get_equivalent_obj(obj);
4523 if (obj->variant_type == YAFFS_OBJECT_TYPE_SYMLINK)
4524 return yaffs_clone_str(obj->variant.symlink_variant.alias);
4525 else
4526 return yaffs_clone_str(_Y(""));
William Juul0e8cc8b2007-11-15 11:13:05 +01004527}
4528
Charles Manning753ac612012-05-09 16:55:17 +00004529/*--------------------------- Initialisation code -------------------------- */
William Juul0e8cc8b2007-11-15 11:13:05 +01004530
Charles Manning753ac612012-05-09 16:55:17 +00004531static int yaffs_check_dev_fns(const struct yaffs_dev *dev)
William Juul0e8cc8b2007-11-15 11:13:05 +01004532{
William Juul0e8cc8b2007-11-15 11:13:05 +01004533 /* Common functions, gotta have */
Charles Manning753ac612012-05-09 16:55:17 +00004534 if (!dev->param.erase_fn || !dev->param.initialise_flash_fn)
William Juul0e8cc8b2007-11-15 11:13:05 +01004535 return 0;
4536
William Juul0e8cc8b2007-11-15 11:13:05 +01004537 /* Can use the "with tags" style interface for yaffs1 or yaffs2 */
Charles Manning753ac612012-05-09 16:55:17 +00004538 if (dev->param.write_chunk_tags_fn &&
4539 dev->param.read_chunk_tags_fn &&
4540 !dev->param.write_chunk_fn &&
4541 !dev->param.read_chunk_fn &&
4542 dev->param.bad_block_fn && dev->param.query_block_fn)
William Juul0e8cc8b2007-11-15 11:13:05 +01004543 return 1;
William Juul0e8cc8b2007-11-15 11:13:05 +01004544
4545 /* Can use the "spare" style interface for yaffs1 */
Charles Manning753ac612012-05-09 16:55:17 +00004546 if (!dev->param.is_yaffs2 &&
4547 !dev->param.write_chunk_tags_fn &&
4548 !dev->param.read_chunk_tags_fn &&
4549 dev->param.write_chunk_fn &&
4550 dev->param.read_chunk_fn &&
4551 !dev->param.bad_block_fn && !dev->param.query_block_fn)
William Juul0e8cc8b2007-11-15 11:13:05 +01004552 return 1;
4553
4554 return 0; /* bad */
4555}
4556
Charles Manning753ac612012-05-09 16:55:17 +00004557static int yaffs_create_initial_dir(struct yaffs_dev *dev)
William Juul0e8cc8b2007-11-15 11:13:05 +01004558{
Charles Manning753ac612012-05-09 16:55:17 +00004559 /* Initialise the unlinked, deleted, root and lost+found directories */
4560 dev->lost_n_found = dev->root_dir = NULL;
4561 dev->unlinked_dir = dev->del_dir = NULL;
4562 dev->unlinked_dir =
4563 yaffs_create_fake_dir(dev, YAFFS_OBJECTID_UNLINKED, S_IFDIR);
4564 dev->del_dir =
4565 yaffs_create_fake_dir(dev, YAFFS_OBJECTID_DELETED, S_IFDIR);
4566 dev->root_dir =
4567 yaffs_create_fake_dir(dev, YAFFS_OBJECTID_ROOT,
4568 YAFFS_ROOT_MODE | S_IFDIR);
4569 dev->lost_n_found =
4570 yaffs_create_fake_dir(dev, YAFFS_OBJECTID_LOSTNFOUND,
4571 YAFFS_LOSTNFOUND_MODE | S_IFDIR);
Wolfgang Denk4b070802008-08-14 14:41:06 +02004572
Charles Manning753ac612012-05-09 16:55:17 +00004573 if (dev->lost_n_found && dev->root_dir && dev->unlinked_dir
4574 && dev->del_dir) {
4575 yaffs_add_obj_to_dir(dev->root_dir, dev->lost_n_found);
William Juul0e8cc8b2007-11-15 11:13:05 +01004576 return YAFFS_OK;
4577 }
William Juul0e8cc8b2007-11-15 11:13:05 +01004578 return YAFFS_FAIL;
4579}
4580
Charles Manning753ac612012-05-09 16:55:17 +00004581int yaffs_guts_initialise(struct yaffs_dev *dev)
William Juul0e8cc8b2007-11-15 11:13:05 +01004582{
4583 int init_failed = 0;
4584 unsigned x;
4585 int bits;
4586
Charles Manning753ac612012-05-09 16:55:17 +00004587 yaffs_trace(YAFFS_TRACE_TRACING, "yaffs: yaffs_guts_initialise()");
William Juul0e8cc8b2007-11-15 11:13:05 +01004588
4589 /* Check stuff that must be set */
4590
4591 if (!dev) {
Charles Manning753ac612012-05-09 16:55:17 +00004592 yaffs_trace(YAFFS_TRACE_ALWAYS,
4593 "yaffs: Need a device"
4594 );
William Juul0e8cc8b2007-11-15 11:13:05 +01004595 return YAFFS_FAIL;
4596 }
4597
Charles Manning753ac612012-05-09 16:55:17 +00004598 if (dev->is_mounted) {
4599 yaffs_trace(YAFFS_TRACE_ALWAYS, "device already mounted");
4600 return YAFFS_FAIL;
4601 }
William Juul0e8cc8b2007-11-15 11:13:05 +01004602
Charles Manning753ac612012-05-09 16:55:17 +00004603 dev->internal_start_block = dev->param.start_block;
4604 dev->internal_end_block = dev->param.end_block;
4605 dev->block_offset = 0;
4606 dev->chunk_offset = 0;
4607 dev->n_free_chunks = 0;
4608
4609 dev->gc_block = 0;
4610
4611 if (dev->param.start_block == 0) {
4612 dev->internal_start_block = dev->param.start_block + 1;
4613 dev->internal_end_block = dev->param.end_block + 1;
4614 dev->block_offset = 1;
4615 dev->chunk_offset = dev->param.chunks_per_block;
William Juul0e8cc8b2007-11-15 11:13:05 +01004616 }
4617
4618 /* Check geometry parameters. */
4619
Charles Manning753ac612012-05-09 16:55:17 +00004620 if ((!dev->param.inband_tags && dev->param.is_yaffs2 &&
4621 dev->param.total_bytes_per_chunk < 1024) ||
4622 (!dev->param.is_yaffs2 &&
4623 dev->param.total_bytes_per_chunk < 512) ||
4624 (dev->param.inband_tags && !dev->param.is_yaffs2) ||
4625 dev->param.chunks_per_block < 2 ||
4626 dev->param.n_reserved_blocks < 2 ||
4627 dev->internal_start_block <= 0 ||
4628 dev->internal_end_block <= 0 ||
4629 dev->internal_end_block <=
4630 (dev->internal_start_block + dev->param.n_reserved_blocks + 2)
4631 ) {
4632 /* otherwise it is too small */
4633 yaffs_trace(YAFFS_TRACE_ALWAYS,
4634 "NAND geometry problems: chunk size %d, type is yaffs%s, inband_tags %d ",
4635 dev->param.total_bytes_per_chunk,
4636 dev->param.is_yaffs2 ? "2" : "",
4637 dev->param.inband_tags);
William Juul0e8cc8b2007-11-15 11:13:05 +01004638 return YAFFS_FAIL;
4639 }
4640
Charles Manning753ac612012-05-09 16:55:17 +00004641 if (yaffs_init_nand(dev) != YAFFS_OK) {
4642 yaffs_trace(YAFFS_TRACE_ALWAYS, "InitialiseNAND failed");
William Juul0e8cc8b2007-11-15 11:13:05 +01004643 return YAFFS_FAIL;
4644 }
4645
Charles Manning753ac612012-05-09 16:55:17 +00004646 /* Sort out space for inband tags, if required */
4647 if (dev->param.inband_tags)
4648 dev->data_bytes_per_chunk =
4649 dev->param.total_bytes_per_chunk -
4650 sizeof(struct yaffs_packed_tags2_tags_only);
4651 else
4652 dev->data_bytes_per_chunk = dev->param.total_bytes_per_chunk;
4653
William Juul0e8cc8b2007-11-15 11:13:05 +01004654 /* Got the right mix of functions? */
Charles Manning753ac612012-05-09 16:55:17 +00004655 if (!yaffs_check_dev_fns(dev)) {
William Juul0e8cc8b2007-11-15 11:13:05 +01004656 /* Function missing */
Charles Manning753ac612012-05-09 16:55:17 +00004657 yaffs_trace(YAFFS_TRACE_ALWAYS,
4658 "device function(s) missing or wrong");
William Juul0e8cc8b2007-11-15 11:13:05 +01004659
4660 return YAFFS_FAIL;
4661 }
4662
Charles Manning753ac612012-05-09 16:55:17 +00004663 /* Finished with most checks. Further checks happen later on too. */
William Juul0e8cc8b2007-11-15 11:13:05 +01004664
Charles Manning753ac612012-05-09 16:55:17 +00004665 dev->is_mounted = 1;
William Juul0e8cc8b2007-11-15 11:13:05 +01004666
4667 /* OK now calculate a few things for the device */
Wolfgang Denk4b070802008-08-14 14:41:06 +02004668
William Juul0e8cc8b2007-11-15 11:13:05 +01004669 /*
Wolfgang Denk4b070802008-08-14 14:41:06 +02004670 * Calculate all the chunk size manipulation numbers:
William Juul0e8cc8b2007-11-15 11:13:05 +01004671 */
Charles Manning753ac612012-05-09 16:55:17 +00004672 x = dev->data_bytes_per_chunk;
4673 /* We always use dev->chunk_shift and dev->chunk_div */
4674 dev->chunk_shift = calc_shifts(x);
4675 x >>= dev->chunk_shift;
4676 dev->chunk_div = x;
4677 /* We only use chunk mask if chunk_div is 1 */
4678 dev->chunk_mask = (1 << dev->chunk_shift) - 1;
William Juul0e8cc8b2007-11-15 11:13:05 +01004679
4680 /*
Charles Manning753ac612012-05-09 16:55:17 +00004681 * Calculate chunk_grp_bits.
4682 * We need to find the next power of 2 > than internal_end_block
William Juul0e8cc8b2007-11-15 11:13:05 +01004683 */
4684
Charles Manning753ac612012-05-09 16:55:17 +00004685 x = dev->param.chunks_per_block * (dev->internal_end_block + 1);
Wolfgang Denk4b070802008-08-14 14:41:06 +02004686
Charles Manning753ac612012-05-09 16:55:17 +00004687 bits = calc_shifts_ceiling(x);
Wolfgang Denk4b070802008-08-14 14:41:06 +02004688
William Juul0e8cc8b2007-11-15 11:13:05 +01004689 /* Set up tnode width if wide tnodes are enabled. */
Charles Manning753ac612012-05-09 16:55:17 +00004690 if (!dev->param.wide_tnodes_disabled) {
William Juul0e8cc8b2007-11-15 11:13:05 +01004691 /* bits must be even so that we end up with 32-bit words */
Charles Manning753ac612012-05-09 16:55:17 +00004692 if (bits & 1)
William Juul0e8cc8b2007-11-15 11:13:05 +01004693 bits++;
Charles Manning753ac612012-05-09 16:55:17 +00004694 if (bits < 16)
4695 dev->tnode_width = 16;
William Juul0e8cc8b2007-11-15 11:13:05 +01004696 else
Charles Manning753ac612012-05-09 16:55:17 +00004697 dev->tnode_width = bits;
4698 } else {
4699 dev->tnode_width = 16;
William Juul0e8cc8b2007-11-15 11:13:05 +01004700 }
Wolfgang Denk4b070802008-08-14 14:41:06 +02004701
Charles Manning753ac612012-05-09 16:55:17 +00004702 dev->tnode_mask = (1 << dev->tnode_width) - 1;
Wolfgang Denk4b070802008-08-14 14:41:06 +02004703
William Juul0e8cc8b2007-11-15 11:13:05 +01004704 /* Level0 Tnodes are 16 bits or wider (if wide tnodes are enabled),
4705 * so if the bitwidth of the
4706 * chunk range we're using is greater than 16 we need
Charles Manning753ac612012-05-09 16:55:17 +00004707 * to figure out chunk shift and chunk_grp_size
William Juul0e8cc8b2007-11-15 11:13:05 +01004708 */
Wolfgang Denk4b070802008-08-14 14:41:06 +02004709
Charles Manning753ac612012-05-09 16:55:17 +00004710 if (bits <= dev->tnode_width)
4711 dev->chunk_grp_bits = 0;
William Juul0e8cc8b2007-11-15 11:13:05 +01004712 else
Charles Manning753ac612012-05-09 16:55:17 +00004713 dev->chunk_grp_bits = bits - dev->tnode_width;
Wolfgang Denk4b070802008-08-14 14:41:06 +02004714
Charles Manning753ac612012-05-09 16:55:17 +00004715 dev->tnode_size = (dev->tnode_width * YAFFS_NTNODES_LEVEL0) / 8;
4716 if (dev->tnode_size < sizeof(struct yaffs_tnode))
4717 dev->tnode_size = sizeof(struct yaffs_tnode);
William Juul0e8cc8b2007-11-15 11:13:05 +01004718
Charles Manning753ac612012-05-09 16:55:17 +00004719 dev->chunk_grp_size = 1 << dev->chunk_grp_bits;
William Juul0e8cc8b2007-11-15 11:13:05 +01004720
Charles Manning753ac612012-05-09 16:55:17 +00004721 if (dev->param.chunks_per_block < dev->chunk_grp_size) {
William Juul0e8cc8b2007-11-15 11:13:05 +01004722 /* We have a problem because the soft delete won't work if
4723 * the chunk group size > chunks per block.
4724 * This can be remedied by using larger "virtual blocks".
4725 */
Charles Manning753ac612012-05-09 16:55:17 +00004726 yaffs_trace(YAFFS_TRACE_ALWAYS, "chunk group too large");
William Juul0e8cc8b2007-11-15 11:13:05 +01004727
4728 return YAFFS_FAIL;
4729 }
4730
Charles Manning753ac612012-05-09 16:55:17 +00004731 /* Finished verifying the device, continue with initialisation */
William Juul0e8cc8b2007-11-15 11:13:05 +01004732
4733 /* More device initialisation */
Charles Manning753ac612012-05-09 16:55:17 +00004734 dev->all_gcs = 0;
4735 dev->passive_gc_count = 0;
4736 dev->oldest_dirty_gc_count = 0;
4737 dev->bg_gcs = 0;
4738 dev->gc_block_finder = 0;
4739 dev->buffered_block = -1;
4740 dev->doing_buffered_block_rewrite = 0;
4741 dev->n_deleted_files = 0;
4742 dev->n_bg_deletions = 0;
4743 dev->n_unlinked_files = 0;
4744 dev->n_ecc_fixed = 0;
4745 dev->n_ecc_unfixed = 0;
4746 dev->n_tags_ecc_fixed = 0;
4747 dev->n_tags_ecc_unfixed = 0;
4748 dev->n_erase_failures = 0;
4749 dev->n_erased_blocks = 0;
4750 dev->gc_disable = 0;
4751 dev->has_pending_prioritised_gc = 1;
4752 /* Assume the worst for now, will get fixed on first GC */
4753 INIT_LIST_HEAD(&dev->dirty_dirs);
4754 dev->oldest_dirty_seq = 0;
4755 dev->oldest_dirty_block = 0;
William Juul0e8cc8b2007-11-15 11:13:05 +01004756
4757 /* Initialise temporary buffers and caches. */
Charles Manning753ac612012-05-09 16:55:17 +00004758 if (!yaffs_init_tmp_buffers(dev))
William Juul0e8cc8b2007-11-15 11:13:05 +01004759 init_failed = 1;
Wolfgang Denk4b070802008-08-14 14:41:06 +02004760
Charles Manning753ac612012-05-09 16:55:17 +00004761 dev->cache = NULL;
4762 dev->gc_cleanup_list = NULL;
Wolfgang Denk4b070802008-08-14 14:41:06 +02004763
Charles Manning753ac612012-05-09 16:55:17 +00004764 if (!init_failed && dev->param.n_caches > 0) {
William Juul0e8cc8b2007-11-15 11:13:05 +01004765 int i;
Charles Manning753ac612012-05-09 16:55:17 +00004766 void *buf;
4767 int cache_bytes =
4768 dev->param.n_caches * sizeof(struct yaffs_cache);
William Juul0e8cc8b2007-11-15 11:13:05 +01004769
Charles Manning753ac612012-05-09 16:55:17 +00004770 if (dev->param.n_caches > YAFFS_MAX_SHORT_OP_CACHES)
4771 dev->param.n_caches = YAFFS_MAX_SHORT_OP_CACHES;
4772
4773 dev->cache = kmalloc(cache_bytes, GFP_NOFS);
4774
4775 buf = (u8 *) dev->cache;
4776
4777 if (dev->cache)
4778 memset(dev->cache, 0, cache_bytes);
4779
4780 for (i = 0; i < dev->param.n_caches && buf; i++) {
4781 dev->cache[i].object = NULL;
4782 dev->cache[i].last_use = 0;
4783 dev->cache[i].dirty = 0;
4784 dev->cache[i].data = buf =
4785 kmalloc(dev->param.total_bytes_per_chunk, GFP_NOFS);
William Juul0e8cc8b2007-11-15 11:13:05 +01004786 }
Charles Manning753ac612012-05-09 16:55:17 +00004787 if (!buf)
William Juul0e8cc8b2007-11-15 11:13:05 +01004788 init_failed = 1;
Wolfgang Denk4b070802008-08-14 14:41:06 +02004789
Charles Manning753ac612012-05-09 16:55:17 +00004790 dev->cache_last_use = 0;
William Juul0e8cc8b2007-11-15 11:13:05 +01004791 }
4792
Charles Manning753ac612012-05-09 16:55:17 +00004793 dev->cache_hits = 0;
Wolfgang Denk4b070802008-08-14 14:41:06 +02004794
Charles Manning753ac612012-05-09 16:55:17 +00004795 if (!init_failed) {
4796 dev->gc_cleanup_list =
4797 kmalloc(dev->param.chunks_per_block * sizeof(u32),
4798 GFP_NOFS);
4799 if (!dev->gc_cleanup_list)
William Juul0e8cc8b2007-11-15 11:13:05 +01004800 init_failed = 1;
4801 }
4802
Charles Manning753ac612012-05-09 16:55:17 +00004803 if (dev->param.is_yaffs2)
4804 dev->param.use_header_file_size = 1;
4805
4806 if (!init_failed && !yaffs_init_blocks(dev))
William Juul0e8cc8b2007-11-15 11:13:05 +01004807 init_failed = 1;
Wolfgang Denk4b070802008-08-14 14:41:06 +02004808
Charles Manning753ac612012-05-09 16:55:17 +00004809 yaffs_init_tnodes_and_objs(dev);
William Juul0e8cc8b2007-11-15 11:13:05 +01004810
Charles Manning753ac612012-05-09 16:55:17 +00004811 if (!init_failed && !yaffs_create_initial_dir(dev))
William Juul0e8cc8b2007-11-15 11:13:05 +01004812 init_failed = 1;
4813
Charles Manning753ac612012-05-09 16:55:17 +00004814 if (!init_failed && dev->param.is_yaffs2 &&
4815 !dev->param.disable_summary &&
4816 !yaffs_summary_init(dev))
4817 init_failed = 1;
William Juul0e8cc8b2007-11-15 11:13:05 +01004818
Charles Manning753ac612012-05-09 16:55:17 +00004819 if (!init_failed) {
William Juul0e8cc8b2007-11-15 11:13:05 +01004820 /* Now scan the flash. */
Charles Manning753ac612012-05-09 16:55:17 +00004821 if (dev->param.is_yaffs2) {
4822 if (yaffs2_checkpt_restore(dev)) {
4823 yaffs_check_obj_details_loaded(dev->root_dir);
4824 yaffs_trace(YAFFS_TRACE_CHECKPOINT |
4825 YAFFS_TRACE_MOUNT,
4826 "yaffs: restored from checkpoint"
4827 );
William Juul0e8cc8b2007-11-15 11:13:05 +01004828 } else {
4829
Charles Manning753ac612012-05-09 16:55:17 +00004830 /* Clean up the mess caused by an aborted
4831 * checkpoint load then scan backwards.
William Juul0e8cc8b2007-11-15 11:13:05 +01004832 */
Charles Manning753ac612012-05-09 16:55:17 +00004833 yaffs_deinit_blocks(dev);
Wolfgang Denk4b070802008-08-14 14:41:06 +02004834
Charles Manning753ac612012-05-09 16:55:17 +00004835 yaffs_deinit_tnodes_and_objs(dev);
Wolfgang Denk4b070802008-08-14 14:41:06 +02004836
Charles Manning753ac612012-05-09 16:55:17 +00004837 dev->n_erased_blocks = 0;
4838 dev->n_free_chunks = 0;
4839 dev->alloc_block = -1;
4840 dev->alloc_page = -1;
4841 dev->n_deleted_files = 0;
4842 dev->n_unlinked_files = 0;
4843 dev->n_bg_deletions = 0;
William Juul0e8cc8b2007-11-15 11:13:05 +01004844
Charles Manning753ac612012-05-09 16:55:17 +00004845 if (!init_failed && !yaffs_init_blocks(dev))
William Juul0e8cc8b2007-11-15 11:13:05 +01004846 init_failed = 1;
Wolfgang Denk4b070802008-08-14 14:41:06 +02004847
Charles Manning753ac612012-05-09 16:55:17 +00004848 yaffs_init_tnodes_and_objs(dev);
William Juul0e8cc8b2007-11-15 11:13:05 +01004849
Charles Manning753ac612012-05-09 16:55:17 +00004850 if (!init_failed
4851 && !yaffs_create_initial_dir(dev))
William Juul0e8cc8b2007-11-15 11:13:05 +01004852 init_failed = 1;
4853
Charles Manning753ac612012-05-09 16:55:17 +00004854 if (!init_failed && !yaffs2_scan_backwards(dev))
William Juul0e8cc8b2007-11-15 11:13:05 +01004855 init_failed = 1;
4856 }
Charles Manning753ac612012-05-09 16:55:17 +00004857 } else if (!yaffs1_scan(dev)) {
4858 init_failed = 1;
4859 }
4860
4861 yaffs_strip_deleted_objs(dev);
4862 yaffs_fix_hanging_objs(dev);
4863 if (dev->param.empty_lost_n_found)
4864 yaffs_empty_l_n_f(dev);
William Juul0e8cc8b2007-11-15 11:13:05 +01004865 }
Wolfgang Denk4b070802008-08-14 14:41:06 +02004866
Charles Manning753ac612012-05-09 16:55:17 +00004867 if (init_failed) {
William Juul0e8cc8b2007-11-15 11:13:05 +01004868 /* Clean up the mess */
Charles Manning753ac612012-05-09 16:55:17 +00004869 yaffs_trace(YAFFS_TRACE_TRACING,
4870 "yaffs: yaffs_guts_initialise() aborted.");
William Juul0e8cc8b2007-11-15 11:13:05 +01004871
Charles Manning753ac612012-05-09 16:55:17 +00004872 yaffs_deinitialise(dev);
William Juul0e8cc8b2007-11-15 11:13:05 +01004873 return YAFFS_FAIL;
4874 }
4875
4876 /* Zero out stats */
Charles Manning753ac612012-05-09 16:55:17 +00004877 dev->n_page_reads = 0;
4878 dev->n_page_writes = 0;
4879 dev->n_erasures = 0;
4880 dev->n_gc_copies = 0;
4881 dev->n_retried_writes = 0;
William Juul0e8cc8b2007-11-15 11:13:05 +01004882
Charles Manning753ac612012-05-09 16:55:17 +00004883 dev->n_retired_blocks = 0;
William Juul0e8cc8b2007-11-15 11:13:05 +01004884
Charles Manning753ac612012-05-09 16:55:17 +00004885 yaffs_verify_free_chunks(dev);
4886 yaffs_verify_blocks(dev);
Wolfgang Denk4b070802008-08-14 14:41:06 +02004887
Charles Manning753ac612012-05-09 16:55:17 +00004888 /* Clean up any aborted checkpoint data */
4889 if (!dev->is_checkpointed && dev->blocks_in_checkpt > 0)
4890 yaffs2_checkpt_invalidate(dev);
William Juul0e8cc8b2007-11-15 11:13:05 +01004891
Charles Manning753ac612012-05-09 16:55:17 +00004892 yaffs_trace(YAFFS_TRACE_TRACING,
4893 "yaffs: yaffs_guts_initialise() done.");
William Juul0e8cc8b2007-11-15 11:13:05 +01004894 return YAFFS_OK;
William Juul0e8cc8b2007-11-15 11:13:05 +01004895}
4896
Charles Manning753ac612012-05-09 16:55:17 +00004897void yaffs_deinitialise(struct yaffs_dev *dev)
William Juul0e8cc8b2007-11-15 11:13:05 +01004898{
Charles Manning753ac612012-05-09 16:55:17 +00004899 if (dev->is_mounted) {
William Juul0e8cc8b2007-11-15 11:13:05 +01004900 int i;
4901
Charles Manning753ac612012-05-09 16:55:17 +00004902 yaffs_deinit_blocks(dev);
4903 yaffs_deinit_tnodes_and_objs(dev);
4904 yaffs_summary_deinit(dev);
William Juul0e8cc8b2007-11-15 11:13:05 +01004905
Charles Manning753ac612012-05-09 16:55:17 +00004906 if (dev->param.n_caches > 0 && dev->cache) {
4907
4908 for (i = 0; i < dev->param.n_caches; i++) {
4909 kfree(dev->cache[i].data);
4910 dev->cache[i].data = NULL;
William Juul0e8cc8b2007-11-15 11:13:05 +01004911 }
4912
Charles Manning753ac612012-05-09 16:55:17 +00004913 kfree(dev->cache);
4914 dev->cache = NULL;
William Juul0e8cc8b2007-11-15 11:13:05 +01004915 }
4916
Charles Manning753ac612012-05-09 16:55:17 +00004917 kfree(dev->gc_cleanup_list);
William Juul0e8cc8b2007-11-15 11:13:05 +01004918
Charles Manning753ac612012-05-09 16:55:17 +00004919 for (i = 0; i < YAFFS_N_TEMP_BUFFERS; i++)
4920 kfree(dev->temp_buffer[i].buffer);
William Juul0e8cc8b2007-11-15 11:13:05 +01004921
Charles Manning753ac612012-05-09 16:55:17 +00004922 dev->is_mounted = 0;
4923
4924 if (dev->param.deinitialise_flash_fn)
4925 dev->param.deinitialise_flash_fn(dev);
William Juul0e8cc8b2007-11-15 11:13:05 +01004926 }
William Juul0e8cc8b2007-11-15 11:13:05 +01004927}
4928
Charles Manning753ac612012-05-09 16:55:17 +00004929int yaffs_count_free_chunks(struct yaffs_dev *dev)
William Juul0e8cc8b2007-11-15 11:13:05 +01004930{
Charles Manning753ac612012-05-09 16:55:17 +00004931 int n_free = 0;
William Juul0e8cc8b2007-11-15 11:13:05 +01004932 int b;
Charles Manning753ac612012-05-09 16:55:17 +00004933 struct yaffs_block_info *blk;
William Juul0e8cc8b2007-11-15 11:13:05 +01004934
Charles Manning753ac612012-05-09 16:55:17 +00004935 blk = dev->block_info;
4936 for (b = dev->internal_start_block; b <= dev->internal_end_block; b++) {
4937 switch (blk->block_state) {
William Juul0e8cc8b2007-11-15 11:13:05 +01004938 case YAFFS_BLOCK_STATE_EMPTY:
4939 case YAFFS_BLOCK_STATE_ALLOCATING:
4940 case YAFFS_BLOCK_STATE_COLLECTING:
4941 case YAFFS_BLOCK_STATE_FULL:
Charles Manning753ac612012-05-09 16:55:17 +00004942 n_free +=
4943 (dev->param.chunks_per_block - blk->pages_in_use +
4944 blk->soft_del_pages);
William Juul0e8cc8b2007-11-15 11:13:05 +01004945 break;
4946 default:
4947 break;
4948 }
Charles Manning753ac612012-05-09 16:55:17 +00004949 blk++;
William Juul0e8cc8b2007-11-15 11:13:05 +01004950 }
Charles Manning753ac612012-05-09 16:55:17 +00004951 return n_free;
William Juul0e8cc8b2007-11-15 11:13:05 +01004952}
4953
Charles Manning753ac612012-05-09 16:55:17 +00004954int yaffs_get_n_free_chunks(struct yaffs_dev *dev)
William Juul0e8cc8b2007-11-15 11:13:05 +01004955{
4956 /* This is what we report to the outside world */
Charles Manning753ac612012-05-09 16:55:17 +00004957 int n_free;
4958 int n_dirty_caches;
4959 int blocks_for_checkpt;
4960 int i;
William Juul0e8cc8b2007-11-15 11:13:05 +01004961
Charles Manning753ac612012-05-09 16:55:17 +00004962 n_free = dev->n_free_chunks;
4963 n_free += dev->n_deleted_files;
William Juul0e8cc8b2007-11-15 11:13:05 +01004964
Charles Manning753ac612012-05-09 16:55:17 +00004965 /* Now count and subtract the number of dirty chunks in the cache. */
William Juul0e8cc8b2007-11-15 11:13:05 +01004966
Charles Manning753ac612012-05-09 16:55:17 +00004967 for (n_dirty_caches = 0, i = 0; i < dev->param.n_caches; i++) {
4968 if (dev->cache[i].dirty)
4969 n_dirty_caches++;
William Juul0e8cc8b2007-11-15 11:13:05 +01004970 }
4971
Charles Manning753ac612012-05-09 16:55:17 +00004972 n_free -= n_dirty_caches;
William Juul0e8cc8b2007-11-15 11:13:05 +01004973
Charles Manning753ac612012-05-09 16:55:17 +00004974 n_free -=
4975 ((dev->param.n_reserved_blocks + 1) * dev->param.chunks_per_block);
Wolfgang Denk4b070802008-08-14 14:41:06 +02004976
Charles Manning753ac612012-05-09 16:55:17 +00004977 /* Now figure checkpoint space and report that... */
4978 blocks_for_checkpt = yaffs_calc_checkpt_blocks_required(dev);
Wolfgang Denk4b070802008-08-14 14:41:06 +02004979
Charles Manning753ac612012-05-09 16:55:17 +00004980 n_free -= (blocks_for_checkpt * dev->param.chunks_per_block);
William Juul0e8cc8b2007-11-15 11:13:05 +01004981
Charles Manning753ac612012-05-09 16:55:17 +00004982 if (n_free < 0)
4983 n_free = 0;
William Juul0e8cc8b2007-11-15 11:13:05 +01004984
Charles Manning753ac612012-05-09 16:55:17 +00004985 return n_free;
William Juul0e8cc8b2007-11-15 11:13:05 +01004986}
4987
Charles Manning753ac612012-05-09 16:55:17 +00004988/*\
4989 * Marshalling functions to get loff_t file sizes into aand out of
4990 * object headers.
4991 */
4992void yaffs_oh_size_load(struct yaffs_obj_hdr *oh, loff_t fsize)
William Juul0e8cc8b2007-11-15 11:13:05 +01004993{
Charles Manning753ac612012-05-09 16:55:17 +00004994 oh->file_size_low = (fsize & 0xFFFFFFFF);
4995 oh->file_size_high = ((fsize >> 32) & 0xFFFFFFFF);
William Juul0e8cc8b2007-11-15 11:13:05 +01004996}
4997
Charles Manning753ac612012-05-09 16:55:17 +00004998loff_t yaffs_oh_to_size(struct yaffs_obj_hdr *oh)
William Juul0e8cc8b2007-11-15 11:13:05 +01004999{
Charles Manning753ac612012-05-09 16:55:17 +00005000 loff_t retval;
William Juul0e8cc8b2007-11-15 11:13:05 +01005001
Charles Manning753ac612012-05-09 16:55:17 +00005002 if (~(oh->file_size_high))
5003 retval = (((loff_t) oh->file_size_high) << 32) |
5004 (((loff_t) oh->file_size_low) & 0xFFFFFFFF);
5005 else
5006 retval = (loff_t) oh->file_size_low;
5007
5008 return retval;
William Juul0e8cc8b2007-11-15 11:13:05 +01005009}