blob: 21441fd9911e5f86af0e53172d259ae6a96a5954 [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"
William Juul0e8cc8b2007-11-15 11:13:05 +010016
William Juul0e8cc8b2007-11-15 11:13:05 +010017#include "yaffs_guts.h"
Charles Manning753ac612012-05-09 16:55:17 +000018#include "yaffs_getblockinfo.h"
William Juul0e8cc8b2007-11-15 11:13:05 +010019#include "yaffs_tagscompat.h"
William Juul0e8cc8b2007-11-15 11:13:05 +010020#include "yaffs_nand.h"
Charles Manning753ac612012-05-09 16:55:17 +000021#include "yaffs_yaffs1.h"
22#include "yaffs_yaffs2.h"
23#include "yaffs_bitmap.h"
24#include "yaffs_verify.h"
William Juul0e8cc8b2007-11-15 11:13:05 +010025#include "yaffs_nand.h"
26#include "yaffs_packedtags2.h"
Charles Manning753ac612012-05-09 16:55:17 +000027#include "yaffs_nameval.h"
28#include "yaffs_allocator.h"
29#include "yaffs_attribs.h"
30#include "yaffs_summary.h"
William Juul0e8cc8b2007-11-15 11:13:05 +010031
Charles Manning753ac612012-05-09 16:55:17 +000032/* Note YAFFS_GC_GOOD_ENOUGH must be <= YAFFS_GC_PASSIVE_THRESHOLD */
33#define YAFFS_GC_GOOD_ENOUGH 2
34#define YAFFS_GC_PASSIVE_THRESHOLD 4
William Juul0e8cc8b2007-11-15 11:13:05 +010035
36#include "yaffs_ecc.h"
37
Charles Manning753ac612012-05-09 16:55:17 +000038/* Forward declarations */
William Juul0e8cc8b2007-11-15 11:13:05 +010039
Charles Manning753ac612012-05-09 16:55:17 +000040static int yaffs_wr_data_obj(struct yaffs_obj *in, int inode_chunk,
41 const u8 *buffer, int n_bytes, int use_reserve);
William Juul0e8cc8b2007-11-15 11:13:05 +010042
William Juul0e8cc8b2007-11-15 11:13:05 +010043
44
45/* Function to calculate chunk and offset */
46
Charles Manning753ac612012-05-09 16:55:17 +000047void yaffs_addr_to_chunk(struct yaffs_dev *dev, loff_t addr,
48 int *chunk_out, u32 *offset_out)
William Juul0e8cc8b2007-11-15 11:13:05 +010049{
Charles Manning753ac612012-05-09 16:55:17 +000050 int chunk;
51 u32 offset;
52
53 chunk = (u32) (addr >> dev->chunk_shift);
54
55 if (dev->chunk_div == 1) {
56 /* easy power of 2 case */
57 offset = (u32) (addr & dev->chunk_mask);
58 } else {
59 /* Non power-of-2 case */
60
61 loff_t chunk_base;
62
63 chunk /= dev->chunk_div;
64
65 chunk_base = ((loff_t) chunk) * dev->data_bytes_per_chunk;
66 offset = (u32) (addr - chunk_base);
William Juul0e8cc8b2007-11-15 11:13:05 +010067 }
Charles Manning753ac612012-05-09 16:55:17 +000068
69 *chunk_out = chunk;
70 *offset_out = offset;
William Juul0e8cc8b2007-11-15 11:13:05 +010071}
72
Charles Manning753ac612012-05-09 16:55:17 +000073/* Function to return the number of shifts for a power of 2 greater than or
74 * equal to the given number
William Juul0e8cc8b2007-11-15 11:13:05 +010075 * Note we don't try to cater for all possible numbers and this does not have to
76 * be hellishly efficient.
77 */
Wolfgang Denk4b070802008-08-14 14:41:06 +020078
Charles Manning753ac612012-05-09 16:55:17 +000079static inline u32 calc_shifts_ceiling(u32 x)
William Juul0e8cc8b2007-11-15 11:13:05 +010080{
Charles Manning753ac612012-05-09 16:55:17 +000081 int extra_bits;
82 int shifts;
Wolfgang Denk4b070802008-08-14 14:41:06 +020083
Charles Manning753ac612012-05-09 16:55:17 +000084 shifts = extra_bits = 0;
Wolfgang Denk4b070802008-08-14 14:41:06 +020085
Charles Manning753ac612012-05-09 16:55:17 +000086 while (x > 1) {
87 if (x & 1)
88 extra_bits++;
89 x >>= 1;
90 shifts++;
William Juul0e8cc8b2007-11-15 11:13:05 +010091 }
92
Charles Manning753ac612012-05-09 16:55:17 +000093 if (extra_bits)
94 shifts++;
Wolfgang Denk4b070802008-08-14 14:41:06 +020095
Charles Manning753ac612012-05-09 16:55:17 +000096 return shifts;
William Juul0e8cc8b2007-11-15 11:13:05 +010097}
98
99/* Function to return the number of shifts to get a 1 in bit 0
100 */
Wolfgang Denk4b070802008-08-14 14:41:06 +0200101
Charles Manning753ac612012-05-09 16:55:17 +0000102static inline u32 calc_shifts(u32 x)
William Juul0e8cc8b2007-11-15 11:13:05 +0100103{
Charles Manning753ac612012-05-09 16:55:17 +0000104 u32 shifts;
Wolfgang Denk4b070802008-08-14 14:41:06 +0200105
Charles Manning753ac612012-05-09 16:55:17 +0000106 shifts = 0;
Wolfgang Denk4b070802008-08-14 14:41:06 +0200107
Charles Manning753ac612012-05-09 16:55:17 +0000108 if (!x)
109 return 0;
Wolfgang Denk4b070802008-08-14 14:41:06 +0200110
Charles Manning753ac612012-05-09 16:55:17 +0000111 while (!(x & 1)) {
112 x >>= 1;
113 shifts++;
William Juul0e8cc8b2007-11-15 11:13:05 +0100114 }
Wolfgang Denk4b070802008-08-14 14:41:06 +0200115
Charles Manning753ac612012-05-09 16:55:17 +0000116 return shifts;
William Juul0e8cc8b2007-11-15 11:13:05 +0100117}
118
Wolfgang Denk4b070802008-08-14 14:41:06 +0200119/*
William Juul0e8cc8b2007-11-15 11:13:05 +0100120 * Temporary buffer manipulations.
121 */
122
Charles Manning753ac612012-05-09 16:55:17 +0000123static int yaffs_init_tmp_buffers(struct yaffs_dev *dev)
William Juul0e8cc8b2007-11-15 11:13:05 +0100124{
125 int i;
Charles Manning753ac612012-05-09 16:55:17 +0000126 u8 *buf = (u8 *) 1;
Wolfgang Denk4b070802008-08-14 14:41:06 +0200127
Charles Manning753ac612012-05-09 16:55:17 +0000128 memset(dev->temp_buffer, 0, sizeof(dev->temp_buffer));
Wolfgang Denk4b070802008-08-14 14:41:06 +0200129
William Juul0e8cc8b2007-11-15 11:13:05 +0100130 for (i = 0; buf && i < YAFFS_N_TEMP_BUFFERS; i++) {
Charles Manning753ac612012-05-09 16:55:17 +0000131 dev->temp_buffer[i].in_use = 0;
132 buf = kmalloc(dev->param.total_bytes_per_chunk, GFP_NOFS);
133 dev->temp_buffer[i].buffer = buf;
William Juul0e8cc8b2007-11-15 11:13:05 +0100134 }
Wolfgang Denk4b070802008-08-14 14:41:06 +0200135
William Juul0e8cc8b2007-11-15 11:13:05 +0100136 return buf ? YAFFS_OK : YAFFS_FAIL;
William Juul0e8cc8b2007-11-15 11:13:05 +0100137}
138
Charles Manning753ac612012-05-09 16:55:17 +0000139u8 *yaffs_get_temp_buffer(struct yaffs_dev * dev)
William Juul0e8cc8b2007-11-15 11:13:05 +0100140{
Charles Manning753ac612012-05-09 16:55:17 +0000141 int i;
William Juul0e8cc8b2007-11-15 11:13:05 +0100142
Charles Manning753ac612012-05-09 16:55:17 +0000143 dev->temp_in_use++;
144 if (dev->temp_in_use > dev->max_temp)
145 dev->max_temp = dev->temp_in_use;
146
147 for (i = 0; i < YAFFS_N_TEMP_BUFFERS; i++) {
148 if (dev->temp_buffer[i].in_use == 0) {
149 dev->temp_buffer[i].in_use = 1;
150 return dev->temp_buffer[i].buffer;
William Juul0e8cc8b2007-11-15 11:13:05 +0100151 }
152 }
153
Charles Manning753ac612012-05-09 16:55:17 +0000154 yaffs_trace(YAFFS_TRACE_BUFFERS, "Out of temp buffers");
William Juul0e8cc8b2007-11-15 11:13:05 +0100155 /*
156 * If we got here then we have to allocate an unmanaged one
157 * This is not good.
158 */
159
Charles Manning753ac612012-05-09 16:55:17 +0000160 dev->unmanaged_buffer_allocs++;
161 return kmalloc(dev->data_bytes_per_chunk, GFP_NOFS);
William Juul0e8cc8b2007-11-15 11:13:05 +0100162
163}
164
Charles Manning753ac612012-05-09 16:55:17 +0000165void yaffs_release_temp_buffer(struct yaffs_dev *dev, u8 *buffer)
William Juul0e8cc8b2007-11-15 11:13:05 +0100166{
167 int i;
Charles Manning753ac612012-05-09 16:55:17 +0000168
169 dev->temp_in_use--;
170
William Juul0e8cc8b2007-11-15 11:13:05 +0100171 for (i = 0; i < YAFFS_N_TEMP_BUFFERS; i++) {
Charles Manning753ac612012-05-09 16:55:17 +0000172 if (dev->temp_buffer[i].buffer == buffer) {
173 dev->temp_buffer[i].in_use = 0;
William Juul0e8cc8b2007-11-15 11:13:05 +0100174 return;
175 }
176 }
177
178 if (buffer) {
179 /* assume it is an unmanaged one. */
Charles Manning753ac612012-05-09 16:55:17 +0000180 yaffs_trace(YAFFS_TRACE_BUFFERS,
181 "Releasing unmanaged temp buffer");
182 kfree(buffer);
183 dev->unmanaged_buffer_deallocs++;
William Juul0e8cc8b2007-11-15 11:13:05 +0100184 }
185
186}
187
188/*
189 * Determine if we have a managed buffer.
190 */
Charles Manning753ac612012-05-09 16:55:17 +0000191int yaffs_is_managed_tmp_buffer(struct yaffs_dev *dev, const u8 *buffer)
William Juul0e8cc8b2007-11-15 11:13:05 +0100192{
193 int i;
Charles Manning753ac612012-05-09 16:55:17 +0000194
William Juul0e8cc8b2007-11-15 11:13:05 +0100195 for (i = 0; i < YAFFS_N_TEMP_BUFFERS; i++) {
Charles Manning753ac612012-05-09 16:55:17 +0000196 if (dev->temp_buffer[i].buffer == buffer)
William Juul0e8cc8b2007-11-15 11:13:05 +0100197 return 1;
William Juul0e8cc8b2007-11-15 11:13:05 +0100198 }
199
Charles Manning753ac612012-05-09 16:55:17 +0000200 for (i = 0; i < dev->param.n_caches; i++) {
201 if (dev->cache[i].data == buffer)
William Juul0e8cc8b2007-11-15 11:13:05 +0100202 return 1;
William Juul0e8cc8b2007-11-15 11:13:05 +0100203 }
Charles Manning753ac612012-05-09 16:55:17 +0000204
205 if (buffer == dev->checkpt_buffer)
206 return 1;
207
208 yaffs_trace(YAFFS_TRACE_ALWAYS,
209 "yaffs: unmaged buffer detected.");
William Juul0e8cc8b2007-11-15 11:13:05 +0100210 return 0;
211}
212
Charles Manning753ac612012-05-09 16:55:17 +0000213/*
214 * Functions for robustisizing TODO
215 *
216 */
Wolfgang Denk4b070802008-08-14 14:41:06 +0200217
Charles Manning753ac612012-05-09 16:55:17 +0000218static void yaffs_handle_chunk_wr_ok(struct yaffs_dev *dev, int nand_chunk,
219 const u8 *data,
220 const struct yaffs_ext_tags *tags)
221{
222 dev = dev;
223 nand_chunk = nand_chunk;
224 data = data;
225 tags = tags;
226}
227
228static void yaffs_handle_chunk_update(struct yaffs_dev *dev, int nand_chunk,
229 const struct yaffs_ext_tags *tags)
230{
231 dev = dev;
232 nand_chunk = nand_chunk;
233 tags = tags;
234}
235
236void yaffs_handle_chunk_error(struct yaffs_dev *dev,
237 struct yaffs_block_info *bi)
238{
239 if (!bi->gc_prioritise) {
240 bi->gc_prioritise = 1;
241 dev->has_pending_prioritised_gc = 1;
242 bi->chunk_error_strikes++;
243
244 if (bi->chunk_error_strikes > 3) {
245 bi->needs_retiring = 1; /* Too many stikes, so retire */
246 yaffs_trace(YAFFS_TRACE_ALWAYS,
247 "yaffs: Block struck out");
248
249 }
William Juul0e8cc8b2007-11-15 11:13:05 +0100250 }
Charles Manning753ac612012-05-09 16:55:17 +0000251}
252
253static void yaffs_handle_chunk_wr_error(struct yaffs_dev *dev, int nand_chunk,
254 int erased_ok)
255{
256 int flash_block = nand_chunk / dev->param.chunks_per_block;
257 struct yaffs_block_info *bi = yaffs_get_block_info(dev, flash_block);
258
259 yaffs_handle_chunk_error(dev, bi);
260
261 if (erased_ok) {
262 /* Was an actual write failure,
263 * so mark the block for retirement.*/
264 bi->needs_retiring = 1;
265 yaffs_trace(YAFFS_TRACE_ERROR | YAFFS_TRACE_BAD_BLOCKS,
266 "**>> Block %d needs retiring", flash_block);
267 }
268
269 /* Delete the chunk */
270 yaffs_chunk_del(dev, nand_chunk, 1, __LINE__);
271 yaffs_skip_rest_of_block(dev);
William Juul0e8cc8b2007-11-15 11:13:05 +0100272}
273
Wolfgang Denk4b070802008-08-14 14:41:06 +0200274/*
William Juul0e8cc8b2007-11-15 11:13:05 +0100275 * Verification code
276 */
Wolfgang Denk4b070802008-08-14 14:41:06 +0200277
William Juul0e8cc8b2007-11-15 11:13:05 +0100278/*
279 * Simple hash function. Needs to have a reasonable spread
280 */
Wolfgang Denk4b070802008-08-14 14:41:06 +0200281
Charles Manning753ac612012-05-09 16:55:17 +0000282static inline int yaffs_hash_fn(int n)
William Juul0e8cc8b2007-11-15 11:13:05 +0100283{
William Juul90ef1172007-11-15 12:23:57 +0100284 if (n < 0)
285 n = -n;
Charles Manning753ac612012-05-09 16:55:17 +0000286 return n % YAFFS_NOBJECT_BUCKETS;
William Juul0e8cc8b2007-11-15 11:13:05 +0100287}
288
289/*
Charles Manning753ac612012-05-09 16:55:17 +0000290 * Access functions to useful fake objects.
291 * Note that root might have a presence in NAND if permissions are set.
William Juul0e8cc8b2007-11-15 11:13:05 +0100292 */
Wolfgang Denk4b070802008-08-14 14:41:06 +0200293
Charles Manning753ac612012-05-09 16:55:17 +0000294struct yaffs_obj *yaffs_root(struct yaffs_dev *dev)
William Juul0e8cc8b2007-11-15 11:13:05 +0100295{
Charles Manning753ac612012-05-09 16:55:17 +0000296 return dev->root_dir;
William Juul0e8cc8b2007-11-15 11:13:05 +0100297}
298
Charles Manning753ac612012-05-09 16:55:17 +0000299struct yaffs_obj *yaffs_lost_n_found(struct yaffs_dev *dev)
William Juul0e8cc8b2007-11-15 11:13:05 +0100300{
Charles Manning753ac612012-05-09 16:55:17 +0000301 return dev->lost_n_found;
William Juul0e8cc8b2007-11-15 11:13:05 +0100302}
303
William Juul0e8cc8b2007-11-15 11:13:05 +0100304/*
305 * Erased NAND checking functions
306 */
Wolfgang Denk4b070802008-08-14 14:41:06 +0200307
Charles Manning753ac612012-05-09 16:55:17 +0000308int yaffs_check_ff(u8 *buffer, int n_bytes)
William Juul0e8cc8b2007-11-15 11:13:05 +0100309{
310 /* Horrible, slow implementation */
Charles Manning753ac612012-05-09 16:55:17 +0000311 while (n_bytes--) {
312 if (*buffer != 0xff)
William Juul0e8cc8b2007-11-15 11:13:05 +0100313 return 0;
314 buffer++;
315 }
316 return 1;
317}
318
Charles Manning753ac612012-05-09 16:55:17 +0000319static int yaffs_check_chunk_erased(struct yaffs_dev *dev, int nand_chunk)
William Juul0e8cc8b2007-11-15 11:13:05 +0100320{
William Juul0e8cc8b2007-11-15 11:13:05 +0100321 int retval = YAFFS_OK;
Charles Manning753ac612012-05-09 16:55:17 +0000322 u8 *data = yaffs_get_temp_buffer(dev);
323 struct yaffs_ext_tags tags;
William Juul0e8cc8b2007-11-15 11:13:05 +0100324
Anatolij Gustschin8cc64ba2012-10-05 23:31:03 +0000325 yaffs_rd_chunk_tags_nand(dev, nand_chunk, data, &tags);
Wolfgang Denk4b070802008-08-14 14:41:06 +0200326
Charles Manning753ac612012-05-09 16:55:17 +0000327 if (tags.ecc_result > YAFFS_ECC_RESULT_NO_ERROR)
William Juul0e8cc8b2007-11-15 11:13:05 +0100328 retval = YAFFS_FAIL;
Wolfgang Denk4b070802008-08-14 14:41:06 +0200329
Charles Manning753ac612012-05-09 16:55:17 +0000330 if (!yaffs_check_ff(data, dev->data_bytes_per_chunk) ||
331 tags.chunk_used) {
332 yaffs_trace(YAFFS_TRACE_NANDACCESS,
333 "Chunk %d not erased", nand_chunk);
William Juul0e8cc8b2007-11-15 11:13:05 +0100334 retval = YAFFS_FAIL;
335 }
336
Charles Manning753ac612012-05-09 16:55:17 +0000337 yaffs_release_temp_buffer(dev, data);
William Juul0e8cc8b2007-11-15 11:13:05 +0100338
339 return retval;
340
341}
342
Charles Manning753ac612012-05-09 16:55:17 +0000343static int yaffs_verify_chunk_written(struct yaffs_dev *dev,
344 int nand_chunk,
345 const u8 *data,
346 struct yaffs_ext_tags *tags)
347{
348 int retval = YAFFS_OK;
349 struct yaffs_ext_tags temp_tags;
350 u8 *buffer = yaffs_get_temp_buffer(dev);
Charles Manning753ac612012-05-09 16:55:17 +0000351
Anatolij Gustschin8cc64ba2012-10-05 23:31:03 +0000352 yaffs_rd_chunk_tags_nand(dev, nand_chunk, buffer, &temp_tags);
Charles Manning753ac612012-05-09 16:55:17 +0000353 if (memcmp(buffer, data, dev->data_bytes_per_chunk) ||
354 temp_tags.obj_id != tags->obj_id ||
355 temp_tags.chunk_id != tags->chunk_id ||
356 temp_tags.n_bytes != tags->n_bytes)
357 retval = YAFFS_FAIL;
358
359 yaffs_release_temp_buffer(dev, buffer);
360
361 return retval;
362}
363
364
365int yaffs_check_alloc_available(struct yaffs_dev *dev, int n_chunks)
366{
367 int reserved_chunks;
368 int reserved_blocks = dev->param.n_reserved_blocks;
369 int checkpt_blocks;
370
371 checkpt_blocks = yaffs_calc_checkpt_blocks_required(dev);
372
373 reserved_chunks =
374 (reserved_blocks + checkpt_blocks) * dev->param.chunks_per_block;
375
376 return (dev->n_free_chunks > (reserved_chunks + n_chunks));
377}
378
379static int yaffs_find_alloc_block(struct yaffs_dev *dev)
380{
381 int i;
382 struct yaffs_block_info *bi;
383
384 if (dev->n_erased_blocks < 1) {
385 /* Hoosterman we've got a problem.
386 * Can't get space to gc
387 */
388 yaffs_trace(YAFFS_TRACE_ERROR,
389 "yaffs tragedy: no more erased blocks");
390
391 return -1;
392 }
393
394 /* Find an empty block. */
395
396 for (i = dev->internal_start_block; i <= dev->internal_end_block; i++) {
397 dev->alloc_block_finder++;
398 if (dev->alloc_block_finder < dev->internal_start_block
399 || dev->alloc_block_finder > dev->internal_end_block) {
400 dev->alloc_block_finder = dev->internal_start_block;
401 }
402
403 bi = yaffs_get_block_info(dev, dev->alloc_block_finder);
404
405 if (bi->block_state == YAFFS_BLOCK_STATE_EMPTY) {
406 bi->block_state = YAFFS_BLOCK_STATE_ALLOCATING;
407 dev->seq_number++;
408 bi->seq_number = dev->seq_number;
409 dev->n_erased_blocks--;
410 yaffs_trace(YAFFS_TRACE_ALLOCATE,
411 "Allocated block %d, seq %d, %d left" ,
412 dev->alloc_block_finder, dev->seq_number,
413 dev->n_erased_blocks);
414 return dev->alloc_block_finder;
415 }
416 }
417
418 yaffs_trace(YAFFS_TRACE_ALWAYS,
419 "yaffs tragedy: no more erased blocks, but there should have been %d",
420 dev->n_erased_blocks);
421
422 return -1;
423}
424
425static int yaffs_alloc_chunk(struct yaffs_dev *dev, int use_reserver,
426 struct yaffs_block_info **block_ptr)
427{
428 int ret_val;
429 struct yaffs_block_info *bi;
430
431 if (dev->alloc_block < 0) {
432 /* Get next block to allocate off */
433 dev->alloc_block = yaffs_find_alloc_block(dev);
434 dev->alloc_page = 0;
435 }
436
437 if (!use_reserver && !yaffs_check_alloc_available(dev, 1)) {
438 /* No space unless we're allowed to use the reserve. */
439 return -1;
440 }
441
442 if (dev->n_erased_blocks < dev->param.n_reserved_blocks
443 && dev->alloc_page == 0)
444 yaffs_trace(YAFFS_TRACE_ALLOCATE, "Allocating reserve");
445
446 /* Next page please.... */
447 if (dev->alloc_block >= 0) {
448 bi = yaffs_get_block_info(dev, dev->alloc_block);
449
450 ret_val = (dev->alloc_block * dev->param.chunks_per_block) +
451 dev->alloc_page;
452 bi->pages_in_use++;
453 yaffs_set_chunk_bit(dev, dev->alloc_block, dev->alloc_page);
454
455 dev->alloc_page++;
456
457 dev->n_free_chunks--;
458
459 /* If the block is full set the state to full */
460 if (dev->alloc_page >= dev->param.chunks_per_block) {
461 bi->block_state = YAFFS_BLOCK_STATE_FULL;
462 dev->alloc_block = -1;
463 }
464
465 if (block_ptr)
466 *block_ptr = bi;
467
468 return ret_val;
469 }
470
471 yaffs_trace(YAFFS_TRACE_ERROR,
472 "!!!!!!!!! Allocator out !!!!!!!!!!!!!!!!!");
473
474 return -1;
475}
476
477static int yaffs_get_erased_chunks(struct yaffs_dev *dev)
478{
479 int n;
480
481 n = dev->n_erased_blocks * dev->param.chunks_per_block;
482
483 if (dev->alloc_block > 0)
484 n += (dev->param.chunks_per_block - dev->alloc_page);
485
486 return n;
487
488}
489
490/*
491 * yaffs_skip_rest_of_block() skips over the rest of the allocation block
492 * if we don't want to write to it.
493 */
494void yaffs_skip_rest_of_block(struct yaffs_dev *dev)
495{
496 struct yaffs_block_info *bi;
497
498 if (dev->alloc_block > 0) {
499 bi = yaffs_get_block_info(dev, dev->alloc_block);
500 if (bi->block_state == YAFFS_BLOCK_STATE_ALLOCATING) {
501 bi->block_state = YAFFS_BLOCK_STATE_FULL;
502 dev->alloc_block = -1;
503 }
504 }
505}
506
507static int yaffs_write_new_chunk(struct yaffs_dev *dev,
508 const u8 *data,
509 struct yaffs_ext_tags *tags, int use_reserver)
William Juul0e8cc8b2007-11-15 11:13:05 +0100510{
511 int attempts = 0;
Charles Manning753ac612012-05-09 16:55:17 +0000512 int write_ok = 0;
William Juul0e8cc8b2007-11-15 11:13:05 +0100513 int chunk;
514
Charles Manning753ac612012-05-09 16:55:17 +0000515 yaffs2_checkpt_invalidate(dev);
William Juul0e8cc8b2007-11-15 11:13:05 +0100516
517 do {
Charles Manning753ac612012-05-09 16:55:17 +0000518 struct yaffs_block_info *bi = 0;
519 int erased_ok = 0;
William Juul0e8cc8b2007-11-15 11:13:05 +0100520
Charles Manning753ac612012-05-09 16:55:17 +0000521 chunk = yaffs_alloc_chunk(dev, use_reserver, &bi);
William Juul0e8cc8b2007-11-15 11:13:05 +0100522 if (chunk < 0) {
523 /* no space */
524 break;
525 }
526
527 /* First check this chunk is erased, if it needs
528 * checking. The checking policy (unless forced
529 * always on) is as follows:
530 *
531 * Check the first page we try to write in a block.
532 * If the check passes then we don't need to check any
Charles Manning753ac612012-05-09 16:55:17 +0000533 * more. If the check fails, we check again...
William Juul0e8cc8b2007-11-15 11:13:05 +0100534 * If the block has been erased, we don't need to check.
535 *
536 * However, if the block has been prioritised for gc,
537 * then we think there might be something odd about
538 * this block and stop using it.
539 *
540 * Rationale: We should only ever see chunks that have
541 * not been erased if there was a partially written
542 * chunk due to power loss. This checking policy should
543 * catch that case with very few checks and thus save a
544 * lot of checks that are most likely not needed.
Charles Manning753ac612012-05-09 16:55:17 +0000545 *
546 * Mods to the above
547 * If an erase check fails or the write fails we skip the
548 * rest of the block.
William Juul0e8cc8b2007-11-15 11:13:05 +0100549 */
William Juul0e8cc8b2007-11-15 11:13:05 +0100550
551 /* let's give it a try */
552 attempts++;
553
Charles Manning753ac612012-05-09 16:55:17 +0000554 if (dev->param.always_check_erased)
555 bi->skip_erased_check = 0;
William Juul0e8cc8b2007-11-15 11:13:05 +0100556
Charles Manning753ac612012-05-09 16:55:17 +0000557 if (!bi->skip_erased_check) {
558 erased_ok = yaffs_check_chunk_erased(dev, chunk);
559 if (erased_ok != YAFFS_OK) {
560 yaffs_trace(YAFFS_TRACE_ERROR,
561 "**>> yaffs chunk %d was not erased",
562 chunk);
563
564 /* If not erased, delete this one,
565 * skip rest of block and
566 * try another chunk */
567 yaffs_chunk_del(dev, chunk, 1, __LINE__);
568 yaffs_skip_rest_of_block(dev);
William Juul0e8cc8b2007-11-15 11:13:05 +0100569 continue;
570 }
William Juul0e8cc8b2007-11-15 11:13:05 +0100571 }
572
Charles Manning753ac612012-05-09 16:55:17 +0000573 write_ok = yaffs_wr_chunk_tags_nand(dev, chunk, data, tags);
574
575 if (!bi->skip_erased_check)
576 write_ok =
577 yaffs_verify_chunk_written(dev, chunk, data, tags);
578
579 if (write_ok != YAFFS_OK) {
580 /* Clean up aborted write, skip to next block and
581 * try another chunk */
582 yaffs_handle_chunk_wr_error(dev, chunk, erased_ok);
William Juul0e8cc8b2007-11-15 11:13:05 +0100583 continue;
584 }
585
Charles Manning753ac612012-05-09 16:55:17 +0000586 bi->skip_erased_check = 1;
587
William Juul0e8cc8b2007-11-15 11:13:05 +0100588 /* Copy the data into the robustification buffer */
Charles Manning753ac612012-05-09 16:55:17 +0000589 yaffs_handle_chunk_wr_ok(dev, chunk, data, tags);
William Juul0e8cc8b2007-11-15 11:13:05 +0100590
Charles Manning753ac612012-05-09 16:55:17 +0000591 } while (write_ok != YAFFS_OK &&
592 (yaffs_wr_attempts <= 0 || attempts <= yaffs_wr_attempts));
Wolfgang Denk4b070802008-08-14 14:41:06 +0200593
Charles Manning753ac612012-05-09 16:55:17 +0000594 if (!write_ok)
William Juul0e8cc8b2007-11-15 11:13:05 +0100595 chunk = -1;
596
597 if (attempts > 1) {
Charles Manning753ac612012-05-09 16:55:17 +0000598 yaffs_trace(YAFFS_TRACE_ERROR,
599 "**>> yaffs write required %d attempts",
600 attempts);
601 dev->n_retried_writes += (attempts - 1);
William Juul0e8cc8b2007-11-15 11:13:05 +0100602 }
603
604 return chunk;
605}
606
607/*
608 * Block retiring for handling a broken block.
609 */
Wolfgang Denk4b070802008-08-14 14:41:06 +0200610
Charles Manning753ac612012-05-09 16:55:17 +0000611static void yaffs_retire_block(struct yaffs_dev *dev, int flash_block)
William Juul0e8cc8b2007-11-15 11:13:05 +0100612{
Charles Manning753ac612012-05-09 16:55:17 +0000613 struct yaffs_block_info *bi = yaffs_get_block_info(dev, flash_block);
William Juul0e8cc8b2007-11-15 11:13:05 +0100614
Charles Manning753ac612012-05-09 16:55:17 +0000615 yaffs2_checkpt_invalidate(dev);
Wolfgang Denk4b070802008-08-14 14:41:06 +0200616
Charles Manning753ac612012-05-09 16:55:17 +0000617 yaffs2_clear_oldest_dirty_seq(dev, bi);
William Juul0e8cc8b2007-11-15 11:13:05 +0100618
Charles Manning753ac612012-05-09 16:55:17 +0000619 if (yaffs_mark_bad(dev, flash_block) != YAFFS_OK) {
620 if (yaffs_erase_block(dev, flash_block) != YAFFS_OK) {
621 yaffs_trace(YAFFS_TRACE_ALWAYS,
622 "yaffs: Failed to mark bad and erase block %d",
623 flash_block);
624 } else {
625 struct yaffs_ext_tags tags;
626 int chunk_id =
627 flash_block * dev->param.chunks_per_block;
William Juul0e8cc8b2007-11-15 11:13:05 +0100628
Charles Manning753ac612012-05-09 16:55:17 +0000629 u8 *buffer = yaffs_get_temp_buffer(dev);
William Juul0e8cc8b2007-11-15 11:13:05 +0100630
Charles Manning753ac612012-05-09 16:55:17 +0000631 memset(buffer, 0xff, dev->data_bytes_per_chunk);
632 memset(&tags, 0, sizeof(tags));
633 tags.seq_number = YAFFS_SEQUENCE_BAD_BLOCK;
634 if (dev->param.write_chunk_tags_fn(dev, chunk_id -
635 dev->chunk_offset,
636 buffer,
637 &tags) != YAFFS_OK)
638 yaffs_trace(YAFFS_TRACE_ALWAYS,
639 "yaffs: Failed to write bad block marker to block %d",
640 flash_block);
Wolfgang Denk4b070802008-08-14 14:41:06 +0200641
Charles Manning753ac612012-05-09 16:55:17 +0000642 yaffs_release_temp_buffer(dev, buffer);
William Juul0e8cc8b2007-11-15 11:13:05 +0100643 }
William Juul0e8cc8b2007-11-15 11:13:05 +0100644 }
Wolfgang Denk4b070802008-08-14 14:41:06 +0200645
Charles Manning753ac612012-05-09 16:55:17 +0000646 bi->block_state = YAFFS_BLOCK_STATE_DEAD;
647 bi->gc_prioritise = 0;
648 bi->needs_retiring = 0;
William Juul0e8cc8b2007-11-15 11:13:05 +0100649
Charles Manning753ac612012-05-09 16:55:17 +0000650 dev->n_retired_blocks++;
651}
William Juul0e8cc8b2007-11-15 11:13:05 +0100652
Wolfgang Denk4b070802008-08-14 14:41:06 +0200653/*---------------- Name handling functions ------------*/
William Juul0e8cc8b2007-11-15 11:13:05 +0100654
Charles Manning753ac612012-05-09 16:55:17 +0000655static u16 yaffs_calc_name_sum(const YCHAR *name)
William Juul0e8cc8b2007-11-15 11:13:05 +0100656{
Charles Manning753ac612012-05-09 16:55:17 +0000657 u16 sum = 0;
658 u16 i = 1;
William Juul0e8cc8b2007-11-15 11:13:05 +0100659
Charles Manning753ac612012-05-09 16:55:17 +0000660 if (!name)
661 return 0;
William Juul0e8cc8b2007-11-15 11:13:05 +0100662
Charles Manning753ac612012-05-09 16:55:17 +0000663 while ((*name) && i < (YAFFS_MAX_NAME_LENGTH / 2)) {
664
665 /* 0x1f mask is case insensitive */
666 sum += ((*name) & 0x1f) * i;
667 i++;
668 name++;
William Juul0e8cc8b2007-11-15 11:13:05 +0100669 }
670 return sum;
671}
672
Charles Manning753ac612012-05-09 16:55:17 +0000673void yaffs_set_obj_name(struct yaffs_obj *obj, const YCHAR * name)
William Juul0e8cc8b2007-11-15 11:13:05 +0100674{
Charles Manning753ac612012-05-09 16:55:17 +0000675 memset(obj->short_name, 0, sizeof(obj->short_name));
676 if (name &&
677 yaffs_strnlen(name, YAFFS_SHORT_NAME_LENGTH + 1) <=
678 YAFFS_SHORT_NAME_LENGTH)
679 yaffs_strcpy(obj->short_name, name);
680 else
681 obj->short_name[0] = _Y('\0');
682 obj->sum = yaffs_calc_name_sum(name);
683}
684
685void yaffs_set_obj_name_from_oh(struct yaffs_obj *obj,
686 const struct yaffs_obj_hdr *oh)
687{
688#ifdef CONFIG_YAFFS_AUTO_UNICODE
689 YCHAR tmp_name[YAFFS_MAX_NAME_LENGTH + 1];
690 memset(tmp_name, 0, sizeof(tmp_name));
691 yaffs_load_name_from_oh(obj->my_dev, tmp_name, oh->name,
692 YAFFS_MAX_NAME_LENGTH + 1);
693 yaffs_set_obj_name(obj, tmp_name);
694#else
695 yaffs_set_obj_name(obj, oh->name);
William Juul0e8cc8b2007-11-15 11:13:05 +0100696#endif
Charles Manning753ac612012-05-09 16:55:17 +0000697}
698
699loff_t yaffs_max_file_size(struct yaffs_dev *dev)
700{
701 return ((loff_t) YAFFS_MAX_CHUNK_ID) * dev->data_bytes_per_chunk;
William Juul0e8cc8b2007-11-15 11:13:05 +0100702}
703
704/*-------------------- TNODES -------------------
705
706 * List of spare tnodes
707 * The list is hooked together using the first pointer
708 * in the tnode.
709 */
Wolfgang Denk4b070802008-08-14 14:41:06 +0200710
Charles Manning753ac612012-05-09 16:55:17 +0000711struct yaffs_tnode *yaffs_get_tnode(struct yaffs_dev *dev)
William Juul0e8cc8b2007-11-15 11:13:05 +0100712{
Charles Manning753ac612012-05-09 16:55:17 +0000713 struct yaffs_tnode *tn = yaffs_alloc_raw_tnode(dev);
William Juul0e8cc8b2007-11-15 11:13:05 +0100714
Charles Manning753ac612012-05-09 16:55:17 +0000715 if (tn) {
716 memset(tn, 0, dev->tnode_size);
717 dev->n_tnodes++;
William Juul0e8cc8b2007-11-15 11:13:05 +0100718 }
719
Charles Manning753ac612012-05-09 16:55:17 +0000720 dev->checkpoint_blocks_required = 0; /* force recalculation */
William Juul0e8cc8b2007-11-15 11:13:05 +0100721
Wolfgang Denk4b070802008-08-14 14:41:06 +0200722 return tn;
William Juul0e8cc8b2007-11-15 11:13:05 +0100723}
724
725/* FreeTnode frees up a tnode and puts it back on the free list */
Charles Manning753ac612012-05-09 16:55:17 +0000726static void yaffs_free_tnode(struct yaffs_dev *dev, struct yaffs_tnode *tn)
William Juul0e8cc8b2007-11-15 11:13:05 +0100727{
Charles Manning753ac612012-05-09 16:55:17 +0000728 yaffs_free_raw_tnode(dev, tn);
729 dev->n_tnodes--;
730 dev->checkpoint_blocks_required = 0; /* force recalculation */
731}
732
733static void yaffs_deinit_tnodes_and_objs(struct yaffs_dev *dev)
734{
735 yaffs_deinit_raw_tnodes_and_objs(dev);
736 dev->n_obj = 0;
737 dev->n_tnodes = 0;
738}
739
740void yaffs_load_tnode_0(struct yaffs_dev *dev, struct yaffs_tnode *tn,
741 unsigned pos, unsigned val)
742{
743 u32 *map = (u32 *) tn;
744 u32 bit_in_map;
745 u32 bit_in_word;
746 u32 word_in_map;
747 u32 mask;
748
749 pos &= YAFFS_TNODES_LEVEL0_MASK;
750 val >>= dev->chunk_grp_bits;
751
752 bit_in_map = pos * dev->tnode_width;
753 word_in_map = bit_in_map / 32;
754 bit_in_word = bit_in_map & (32 - 1);
755
756 mask = dev->tnode_mask << bit_in_word;
757
758 map[word_in_map] &= ~mask;
759 map[word_in_map] |= (mask & (val << bit_in_word));
760
761 if (dev->tnode_width > (32 - bit_in_word)) {
762 bit_in_word = (32 - bit_in_word);
763 word_in_map++;
764 mask =
765 dev->tnode_mask >> bit_in_word;
766 map[word_in_map] &= ~mask;
767 map[word_in_map] |= (mask & (val >> bit_in_word));
William Juul0e8cc8b2007-11-15 11:13:05 +0100768 }
769}
770
Charles Manning753ac612012-05-09 16:55:17 +0000771u32 yaffs_get_group_base(struct yaffs_dev *dev, struct yaffs_tnode *tn,
772 unsigned pos)
William Juul0e8cc8b2007-11-15 11:13:05 +0100773{
Charles Manning753ac612012-05-09 16:55:17 +0000774 u32 *map = (u32 *) tn;
775 u32 bit_in_map;
776 u32 bit_in_word;
777 u32 word_in_map;
778 u32 val;
William Juul0e8cc8b2007-11-15 11:13:05 +0100779
Charles Manning753ac612012-05-09 16:55:17 +0000780 pos &= YAFFS_TNODES_LEVEL0_MASK;
William Juul0e8cc8b2007-11-15 11:13:05 +0100781
Charles Manning753ac612012-05-09 16:55:17 +0000782 bit_in_map = pos * dev->tnode_width;
783 word_in_map = bit_in_map / 32;
784 bit_in_word = bit_in_map & (32 - 1);
William Juul0e8cc8b2007-11-15 11:13:05 +0100785
Charles Manning753ac612012-05-09 16:55:17 +0000786 val = map[word_in_map] >> bit_in_word;
787
788 if (dev->tnode_width > (32 - bit_in_word)) {
789 bit_in_word = (32 - bit_in_word);
790 word_in_map++;
791 val |= (map[word_in_map] << bit_in_word);
William Juul0e8cc8b2007-11-15 11:13:05 +0100792 }
793
Charles Manning753ac612012-05-09 16:55:17 +0000794 val &= dev->tnode_mask;
795 val <<= dev->chunk_grp_bits;
William Juul0e8cc8b2007-11-15 11:13:05 +0100796
Charles Manning753ac612012-05-09 16:55:17 +0000797 return val;
William Juul0e8cc8b2007-11-15 11:13:05 +0100798}
799
800/* ------------------- End of individual tnode manipulation -----------------*/
801
802/* ---------Functions to manipulate the look-up tree (made up of tnodes) ------
Charles Manning753ac612012-05-09 16:55:17 +0000803 * The look up tree is represented by the top tnode and the number of top_level
William Juul0e8cc8b2007-11-15 11:13:05 +0100804 * in the tree. 0 means only the level 0 tnode is in the tree.
805 */
806
807/* FindLevel0Tnode finds the level 0 tnode, if one exists. */
Charles Manning753ac612012-05-09 16:55:17 +0000808struct yaffs_tnode *yaffs_find_tnode_0(struct yaffs_dev *dev,
809 struct yaffs_file_var *file_struct,
810 u32 chunk_id)
William Juul0e8cc8b2007-11-15 11:13:05 +0100811{
Charles Manning753ac612012-05-09 16:55:17 +0000812 struct yaffs_tnode *tn = file_struct->top;
813 u32 i;
814 int required_depth;
815 int level = file_struct->top_level;
William Juul0e8cc8b2007-11-15 11:13:05 +0100816
Charles Manning753ac612012-05-09 16:55:17 +0000817 dev = dev;
William Juul0e8cc8b2007-11-15 11:13:05 +0100818
819 /* Check sane level and chunk Id */
Charles Manning753ac612012-05-09 16:55:17 +0000820 if (level < 0 || level > YAFFS_TNODES_MAX_LEVEL)
William Juul0e8cc8b2007-11-15 11:13:05 +0100821 return NULL;
William Juul0e8cc8b2007-11-15 11:13:05 +0100822
Charles Manning753ac612012-05-09 16:55:17 +0000823 if (chunk_id > YAFFS_MAX_CHUNK_ID)
William Juul0e8cc8b2007-11-15 11:13:05 +0100824 return NULL;
William Juul0e8cc8b2007-11-15 11:13:05 +0100825
Charles Manning753ac612012-05-09 16:55:17 +0000826 /* First check we're tall enough (ie enough top_level) */
William Juul0e8cc8b2007-11-15 11:13:05 +0100827
Charles Manning753ac612012-05-09 16:55:17 +0000828 i = chunk_id >> YAFFS_TNODES_LEVEL0_BITS;
829 required_depth = 0;
William Juul0e8cc8b2007-11-15 11:13:05 +0100830 while (i) {
831 i >>= YAFFS_TNODES_INTERNAL_BITS;
Charles Manning753ac612012-05-09 16:55:17 +0000832 required_depth++;
William Juul0e8cc8b2007-11-15 11:13:05 +0100833 }
834
Charles Manning753ac612012-05-09 16:55:17 +0000835 if (required_depth > file_struct->top_level)
836 return NULL; /* Not tall enough, so we can't find it */
William Juul0e8cc8b2007-11-15 11:13:05 +0100837
838 /* Traverse down to level 0 */
839 while (level > 0 && tn) {
Charles Manning753ac612012-05-09 16:55:17 +0000840 tn = tn->internal[(chunk_id >>
841 (YAFFS_TNODES_LEVEL0_BITS +
842 (level - 1) *
843 YAFFS_TNODES_INTERNAL_BITS)) &
844 YAFFS_TNODES_INTERNAL_MASK];
William Juul0e8cc8b2007-11-15 11:13:05 +0100845 level--;
William Juul0e8cc8b2007-11-15 11:13:05 +0100846 }
847
848 return tn;
849}
850
Charles Manning753ac612012-05-09 16:55:17 +0000851/* add_find_tnode_0 finds the level 0 tnode if it exists,
852 * otherwise first expands the tree.
William Juul0e8cc8b2007-11-15 11:13:05 +0100853 * This happens in two steps:
854 * 1. If the tree isn't tall enough, then make it taller.
855 * 2. Scan down the tree towards the level 0 tnode adding tnodes if required.
856 *
857 * Used when modifying the tree.
858 *
Charles Manning753ac612012-05-09 16:55:17 +0000859 * If the tn argument is NULL, then a fresh tnode will be added otherwise the
860 * specified tn will be plugged into the ttree.
William Juul0e8cc8b2007-11-15 11:13:05 +0100861 */
Wolfgang Denk4b070802008-08-14 14:41:06 +0200862
Charles Manning753ac612012-05-09 16:55:17 +0000863struct yaffs_tnode *yaffs_add_find_tnode_0(struct yaffs_dev *dev,
864 struct yaffs_file_var *file_struct,
865 u32 chunk_id,
866 struct yaffs_tnode *passed_tn)
William Juul0e8cc8b2007-11-15 11:13:05 +0100867{
Charles Manning753ac612012-05-09 16:55:17 +0000868 int required_depth;
William Juul0e8cc8b2007-11-15 11:13:05 +0100869 int i;
870 int l;
Charles Manning753ac612012-05-09 16:55:17 +0000871 struct yaffs_tnode *tn;
872 u32 x;
William Juul0e8cc8b2007-11-15 11:13:05 +0100873
874 /* Check sane level and page Id */
Charles Manning753ac612012-05-09 16:55:17 +0000875 if (file_struct->top_level < 0 ||
876 file_struct->top_level > YAFFS_TNODES_MAX_LEVEL)
William Juul0e8cc8b2007-11-15 11:13:05 +0100877 return NULL;
William Juul0e8cc8b2007-11-15 11:13:05 +0100878
Charles Manning753ac612012-05-09 16:55:17 +0000879 if (chunk_id > YAFFS_MAX_CHUNK_ID)
William Juul0e8cc8b2007-11-15 11:13:05 +0100880 return NULL;
William Juul0e8cc8b2007-11-15 11:13:05 +0100881
Charles Manning753ac612012-05-09 16:55:17 +0000882 /* First check we're tall enough (ie enough top_level) */
William Juul0e8cc8b2007-11-15 11:13:05 +0100883
Charles Manning753ac612012-05-09 16:55:17 +0000884 x = chunk_id >> YAFFS_TNODES_LEVEL0_BITS;
885 required_depth = 0;
William Juul0e8cc8b2007-11-15 11:13:05 +0100886 while (x) {
887 x >>= YAFFS_TNODES_INTERNAL_BITS;
Charles Manning753ac612012-05-09 16:55:17 +0000888 required_depth++;
William Juul0e8cc8b2007-11-15 11:13:05 +0100889 }
890
Charles Manning753ac612012-05-09 16:55:17 +0000891 if (required_depth > file_struct->top_level) {
892 /* Not tall enough, gotta make the tree taller */
893 for (i = file_struct->top_level; i < required_depth; i++) {
William Juul0e8cc8b2007-11-15 11:13:05 +0100894
Charles Manning753ac612012-05-09 16:55:17 +0000895 tn = yaffs_get_tnode(dev);
William Juul0e8cc8b2007-11-15 11:13:05 +0100896
897 if (tn) {
Charles Manning753ac612012-05-09 16:55:17 +0000898 tn->internal[0] = file_struct->top;
899 file_struct->top = tn;
900 file_struct->top_level++;
William Juul0e8cc8b2007-11-15 11:13:05 +0100901 } else {
Charles Manning753ac612012-05-09 16:55:17 +0000902 yaffs_trace(YAFFS_TRACE_ERROR,
903 "yaffs: no more tnodes");
904 return NULL;
William Juul0e8cc8b2007-11-15 11:13:05 +0100905 }
906 }
William Juul0e8cc8b2007-11-15 11:13:05 +0100907 }
908
909 /* Traverse down to level 0, adding anything we need */
910
Charles Manning753ac612012-05-09 16:55:17 +0000911 l = file_struct->top_level;
912 tn = file_struct->top;
Wolfgang Denk4b070802008-08-14 14:41:06 +0200913
Charles Manning753ac612012-05-09 16:55:17 +0000914 if (l > 0) {
William Juul0e8cc8b2007-11-15 11:13:05 +0100915 while (l > 0 && tn) {
Charles Manning753ac612012-05-09 16:55:17 +0000916 x = (chunk_id >>
917 (YAFFS_TNODES_LEVEL0_BITS +
William Juul0e8cc8b2007-11-15 11:13:05 +0100918 (l - 1) * YAFFS_TNODES_INTERNAL_BITS)) &
919 YAFFS_TNODES_INTERNAL_MASK;
920
Charles Manning753ac612012-05-09 16:55:17 +0000921 if ((l > 1) && !tn->internal[x]) {
William Juul0e8cc8b2007-11-15 11:13:05 +0100922 /* Add missing non-level-zero tnode */
Charles Manning753ac612012-05-09 16:55:17 +0000923 tn->internal[x] = yaffs_get_tnode(dev);
924 if (!tn->internal[x])
925 return NULL;
926 } else if (l == 1) {
William Juul0e8cc8b2007-11-15 11:13:05 +0100927 /* Looking from level 1 at level 0 */
Charles Manning753ac612012-05-09 16:55:17 +0000928 if (passed_tn) {
929 /* If we already have one, release it */
930 if (tn->internal[x])
931 yaffs_free_tnode(dev,
932 tn->internal[x]);
933 tn->internal[x] = passed_tn;
Wolfgang Denk4b070802008-08-14 14:41:06 +0200934
Charles Manning753ac612012-05-09 16:55:17 +0000935 } else if (!tn->internal[x]) {
William Juul0e8cc8b2007-11-15 11:13:05 +0100936 /* Don't have one, none passed in */
Charles Manning753ac612012-05-09 16:55:17 +0000937 tn->internal[x] = yaffs_get_tnode(dev);
938 if (!tn->internal[x])
939 return NULL;
William Juul0e8cc8b2007-11-15 11:13:05 +0100940 }
941 }
Wolfgang Denk4b070802008-08-14 14:41:06 +0200942
William Juul0e8cc8b2007-11-15 11:13:05 +0100943 tn = tn->internal[x];
944 l--;
945 }
946 } else {
947 /* top is level 0 */
Charles Manning753ac612012-05-09 16:55:17 +0000948 if (passed_tn) {
949 memcpy(tn, passed_tn,
950 (dev->tnode_width * YAFFS_NTNODES_LEVEL0) / 8);
951 yaffs_free_tnode(dev, passed_tn);
William Juul0e8cc8b2007-11-15 11:13:05 +0100952 }
953 }
954
955 return tn;
956}
957
Charles Manning753ac612012-05-09 16:55:17 +0000958static int yaffs_tags_match(const struct yaffs_ext_tags *tags, int obj_id,
959 int chunk_obj)
960{
961 return (tags->chunk_id == chunk_obj &&
962 tags->obj_id == obj_id &&
963 !tags->is_deleted) ? 1 : 0;
964
965}
966
967static int yaffs_find_chunk_in_group(struct yaffs_dev *dev, int the_chunk,
968 struct yaffs_ext_tags *tags, int obj_id,
969 int inode_chunk)
William Juul0e8cc8b2007-11-15 11:13:05 +0100970{
971 int j;
972
Charles Manning753ac612012-05-09 16:55:17 +0000973 for (j = 0; the_chunk && j < dev->chunk_grp_size; j++) {
974 if (yaffs_check_chunk_bit
975 (dev, the_chunk / dev->param.chunks_per_block,
976 the_chunk % dev->param.chunks_per_block)) {
William Juul0e8cc8b2007-11-15 11:13:05 +0100977
Charles Manning753ac612012-05-09 16:55:17 +0000978 if (dev->chunk_grp_size == 1)
979 return the_chunk;
980 else {
981 yaffs_rd_chunk_tags_nand(dev, the_chunk, NULL,
982 tags);
983 if (yaffs_tags_match(tags,
984 obj_id, inode_chunk)) {
985 /* found it; */
986 return the_chunk;
987 }
William Juul0e8cc8b2007-11-15 11:13:05 +0100988 }
989 }
Charles Manning753ac612012-05-09 16:55:17 +0000990 the_chunk++;
William Juul0e8cc8b2007-11-15 11:13:05 +0100991 }
992 return -1;
993}
994
Charles Manning753ac612012-05-09 16:55:17 +0000995static int yaffs_find_chunk_in_file(struct yaffs_obj *in, int inode_chunk,
996 struct yaffs_ext_tags *tags)
William Juul0e8cc8b2007-11-15 11:13:05 +0100997{
Charles Manning753ac612012-05-09 16:55:17 +0000998 /*Get the Tnode, then get the level 0 offset chunk offset */
999 struct yaffs_tnode *tn;
1000 int the_chunk = -1;
1001 struct yaffs_ext_tags local_tags;
1002 int ret_val = -1;
1003 struct yaffs_dev *dev = in->my_dev;
William Juul0e8cc8b2007-11-15 11:13:05 +01001004
Charles Manning753ac612012-05-09 16:55:17 +00001005 if (!tags) {
1006 /* Passed a NULL, so use our own tags space */
1007 tags = &local_tags;
1008 }
William Juul0e8cc8b2007-11-15 11:13:05 +01001009
Charles Manning753ac612012-05-09 16:55:17 +00001010 tn = yaffs_find_tnode_0(dev, &in->variant.file_variant, inode_chunk);
William Juul0e8cc8b2007-11-15 11:13:05 +01001011
Charles Manning753ac612012-05-09 16:55:17 +00001012 if (!tn)
1013 return ret_val;
1014
1015 the_chunk = yaffs_get_group_base(dev, tn, inode_chunk);
1016
1017 ret_val = yaffs_find_chunk_in_group(dev, the_chunk, tags, in->obj_id,
1018 inode_chunk);
1019 return ret_val;
1020}
1021
1022static int yaffs_find_del_file_chunk(struct yaffs_obj *in, int inode_chunk,
1023 struct yaffs_ext_tags *tags)
1024{
1025 /* Get the Tnode, then get the level 0 offset chunk offset */
1026 struct yaffs_tnode *tn;
1027 int the_chunk = -1;
1028 struct yaffs_ext_tags local_tags;
1029 struct yaffs_dev *dev = in->my_dev;
1030 int ret_val = -1;
1031
1032 if (!tags) {
1033 /* Passed a NULL, so use our own tags space */
1034 tags = &local_tags;
1035 }
1036
1037 tn = yaffs_find_tnode_0(dev, &in->variant.file_variant, inode_chunk);
1038
1039 if (!tn)
1040 return ret_val;
1041
1042 the_chunk = yaffs_get_group_base(dev, tn, inode_chunk);
1043
1044 ret_val = yaffs_find_chunk_in_group(dev, the_chunk, tags, in->obj_id,
1045 inode_chunk);
1046
1047 /* Delete the entry in the filestructure (if found) */
1048 if (ret_val != -1)
1049 yaffs_load_tnode_0(dev, tn, inode_chunk, 0);
1050
1051 return ret_val;
1052}
1053
1054int yaffs_put_chunk_in_file(struct yaffs_obj *in, int inode_chunk,
1055 int nand_chunk, int in_scan)
1056{
1057 /* NB in_scan is zero unless scanning.
1058 * For forward scanning, in_scan is > 0;
1059 * for backward scanning in_scan is < 0
1060 *
1061 * nand_chunk = 0 is a dummy insert to make sure the tnodes are there.
1062 */
1063
1064 struct yaffs_tnode *tn;
1065 struct yaffs_dev *dev = in->my_dev;
1066 int existing_cunk;
1067 struct yaffs_ext_tags existing_tags;
1068 struct yaffs_ext_tags new_tags;
1069 unsigned existing_serial, new_serial;
1070
1071 if (in->variant_type != YAFFS_OBJECT_TYPE_FILE) {
1072 /* Just ignore an attempt at putting a chunk into a non-file
1073 * during scanning.
1074 * If it is not during Scanning then something went wrong!
1075 */
1076 if (!in_scan) {
1077 yaffs_trace(YAFFS_TRACE_ERROR,
1078 "yaffs tragedy:attempt to put data chunk into a non-file"
1079 );
1080 BUG();
1081 }
1082
1083 yaffs_chunk_del(dev, nand_chunk, 1, __LINE__);
1084 return YAFFS_OK;
1085 }
1086
1087 tn = yaffs_add_find_tnode_0(dev,
1088 &in->variant.file_variant,
1089 inode_chunk, NULL);
1090 if (!tn)
1091 return YAFFS_FAIL;
1092
1093 if (!nand_chunk)
1094 /* Dummy insert, bail now */
1095 return YAFFS_OK;
1096
1097 existing_cunk = yaffs_get_group_base(dev, tn, inode_chunk);
1098
1099 if (in_scan != 0) {
1100 /* If we're scanning then we need to test for duplicates
1101 * NB This does not need to be efficient since it should only
1102 * happen when the power fails during a write, then only one
1103 * chunk should ever be affected.
1104 *
1105 * Correction for YAFFS2: This could happen quite a lot and we
1106 * need to think about efficiency! TODO
1107 * Update: For backward scanning we don't need to re-read tags
1108 * so this is quite cheap.
1109 */
1110
1111 if (existing_cunk > 0) {
1112 /* NB Right now existing chunk will not be real
1113 * chunk_id if the chunk group size > 1
1114 * thus we have to do a FindChunkInFile to get the
1115 * real chunk id.
1116 *
1117 * We have a duplicate now we need to decide which
1118 * one to use:
1119 *
1120 * Backwards scanning YAFFS2: The old one is what
1121 * we use, dump the new one.
1122 * YAFFS1: Get both sets of tags and compare serial
1123 * numbers.
1124 */
1125
1126 if (in_scan > 0) {
1127 /* Only do this for forward scanning */
1128 yaffs_rd_chunk_tags_nand(dev,
1129 nand_chunk,
1130 NULL, &new_tags);
1131
1132 /* Do a proper find */
1133 existing_cunk =
1134 yaffs_find_chunk_in_file(in, inode_chunk,
1135 &existing_tags);
1136 }
1137
1138 if (existing_cunk <= 0) {
1139 /*Hoosterman - how did this happen? */
1140
1141 yaffs_trace(YAFFS_TRACE_ERROR,
1142 "yaffs tragedy: existing chunk < 0 in scan"
1143 );
1144
1145 }
1146
1147 /* NB The deleted flags should be false, otherwise
1148 * the chunks will not be loaded during a scan
1149 */
1150
1151 if (in_scan > 0) {
1152 new_serial = new_tags.serial_number;
1153 existing_serial = existing_tags.serial_number;
1154 }
1155
1156 if ((in_scan > 0) &&
1157 (existing_cunk <= 0 ||
1158 ((existing_serial + 1) & 3) == new_serial)) {
1159 /* Forward scanning.
1160 * Use new
1161 * Delete the old one and drop through to
1162 * update the tnode
1163 */
1164 yaffs_chunk_del(dev, existing_cunk, 1,
1165 __LINE__);
1166 } else {
1167 /* Backward scanning or we want to use the
1168 * existing one
1169 * Delete the new one and return early so that
1170 * the tnode isn't changed
1171 */
1172 yaffs_chunk_del(dev, nand_chunk, 1, __LINE__);
1173 return YAFFS_OK;
1174 }
1175 }
1176
1177 }
1178
1179 if (existing_cunk == 0)
1180 in->n_data_chunks++;
1181
1182 yaffs_load_tnode_0(dev, tn, inode_chunk, nand_chunk);
1183
1184 return YAFFS_OK;
1185}
1186
1187static void yaffs_soft_del_chunk(struct yaffs_dev *dev, int chunk)
1188{
1189 struct yaffs_block_info *the_block;
1190 unsigned block_no;
1191
1192 yaffs_trace(YAFFS_TRACE_DELETION, "soft delete chunk %d", chunk);
1193
1194 block_no = chunk / dev->param.chunks_per_block;
1195 the_block = yaffs_get_block_info(dev, block_no);
1196 if (the_block) {
1197 the_block->soft_del_pages++;
1198 dev->n_free_chunks++;
1199 yaffs2_update_oldest_dirty_seq(dev, block_no, the_block);
William Juul0e8cc8b2007-11-15 11:13:05 +01001200 }
1201}
1202
Charles Manning753ac612012-05-09 16:55:17 +00001203/* SoftDeleteWorker scans backwards through the tnode tree and soft deletes all
1204 * the chunks in the file.
1205 * All soft deleting does is increment the block's softdelete count and pulls
1206 * the chunk out of the tnode.
1207 * Thus, essentially this is the same as DeleteWorker except that the chunks
1208 * are soft deleted.
William Juul0e8cc8b2007-11-15 11:13:05 +01001209 */
Wolfgang Denk4b070802008-08-14 14:41:06 +02001210
Charles Manning753ac612012-05-09 16:55:17 +00001211static int yaffs_soft_del_worker(struct yaffs_obj *in, struct yaffs_tnode *tn,
1212 u32 level, int chunk_offset)
William Juul0e8cc8b2007-11-15 11:13:05 +01001213{
1214 int i;
Charles Manning753ac612012-05-09 16:55:17 +00001215 int the_chunk;
1216 int all_done = 1;
1217 struct yaffs_dev *dev = in->my_dev;
William Juul0e8cc8b2007-11-15 11:13:05 +01001218
Charles Manning753ac612012-05-09 16:55:17 +00001219 if (!tn)
1220 return 1;
William Juul0e8cc8b2007-11-15 11:13:05 +01001221
Charles Manning753ac612012-05-09 16:55:17 +00001222 if (level > 0) {
1223 for (i = YAFFS_NTNODES_INTERNAL - 1;
1224 all_done && i >= 0;
1225 i--) {
1226 if (tn->internal[i]) {
1227 all_done =
1228 yaffs_soft_del_worker(in,
1229 tn->internal[i],
1230 level - 1,
1231 (chunk_offset <<
1232 YAFFS_TNODES_INTERNAL_BITS)
1233 + i);
1234 if (all_done) {
1235 yaffs_free_tnode(dev,
1236 tn->internal[i]);
1237 tn->internal[i] = NULL;
1238 } else {
1239 /* Can this happen? */
William Juul0e8cc8b2007-11-15 11:13:05 +01001240 }
1241 }
William Juul0e8cc8b2007-11-15 11:13:05 +01001242 }
Charles Manning753ac612012-05-09 16:55:17 +00001243 return (all_done) ? 1 : 0;
William Juul0e8cc8b2007-11-15 11:13:05 +01001244 }
1245
Charles Manning753ac612012-05-09 16:55:17 +00001246 /* level 0 */
1247 for (i = YAFFS_NTNODES_LEVEL0 - 1; i >= 0; i--) {
1248 the_chunk = yaffs_get_group_base(dev, tn, i);
1249 if (the_chunk) {
1250 yaffs_soft_del_chunk(dev, the_chunk);
1251 yaffs_load_tnode_0(dev, tn, i, 0);
1252 }
1253 }
William Juul0e8cc8b2007-11-15 11:13:05 +01001254 return 1;
Charles Manning753ac612012-05-09 16:55:17 +00001255}
1256
1257static void yaffs_remove_obj_from_dir(struct yaffs_obj *obj)
1258{
1259 struct yaffs_dev *dev = obj->my_dev;
1260 struct yaffs_obj *parent;
1261
1262 yaffs_verify_obj_in_dir(obj);
1263 parent = obj->parent;
1264
1265 yaffs_verify_dir(parent);
1266
1267 if (dev && dev->param.remove_obj_fn)
1268 dev->param.remove_obj_fn(obj);
1269
1270 list_del_init(&obj->siblings);
1271 obj->parent = NULL;
1272
1273 yaffs_verify_dir(parent);
1274}
1275
1276void yaffs_add_obj_to_dir(struct yaffs_obj *directory, struct yaffs_obj *obj)
1277{
1278 if (!directory) {
1279 yaffs_trace(YAFFS_TRACE_ALWAYS,
1280 "tragedy: Trying to add an object to a null pointer directory"
1281 );
1282 BUG();
1283 return;
1284 }
1285 if (directory->variant_type != YAFFS_OBJECT_TYPE_DIRECTORY) {
1286 yaffs_trace(YAFFS_TRACE_ALWAYS,
1287 "tragedy: Trying to add an object to a non-directory"
1288 );
1289 BUG();
1290 }
1291
1292 if (obj->siblings.prev == NULL) {
1293 /* Not initialised */
1294 BUG();
1295 }
1296
1297 yaffs_verify_dir(directory);
1298
1299 yaffs_remove_obj_from_dir(obj);
1300
1301 /* Now add it */
1302 list_add(&obj->siblings, &directory->variant.dir_variant.children);
1303 obj->parent = directory;
1304
1305 if (directory == obj->my_dev->unlinked_dir
1306 || directory == obj->my_dev->del_dir) {
1307 obj->unlinked = 1;
1308 obj->my_dev->n_unlinked_files++;
1309 obj->rename_allowed = 0;
1310 }
1311
1312 yaffs_verify_dir(directory);
1313 yaffs_verify_obj_in_dir(obj);
1314}
1315
1316static int yaffs_change_obj_name(struct yaffs_obj *obj,
1317 struct yaffs_obj *new_dir,
1318 const YCHAR *new_name, int force, int shadows)
1319{
1320 int unlink_op;
1321 int del_op;
1322 struct yaffs_obj *existing_target;
1323
1324 if (new_dir == NULL)
1325 new_dir = obj->parent; /* use the old directory */
1326
1327 if (new_dir->variant_type != YAFFS_OBJECT_TYPE_DIRECTORY) {
1328 yaffs_trace(YAFFS_TRACE_ALWAYS,
1329 "tragedy: yaffs_change_obj_name: new_dir is not a directory"
1330 );
1331 BUG();
1332 }
1333
1334 unlink_op = (new_dir == obj->my_dev->unlinked_dir);
1335 del_op = (new_dir == obj->my_dev->del_dir);
1336
1337 existing_target = yaffs_find_by_name(new_dir, new_name);
1338
1339 /* If the object is a file going into the unlinked directory,
1340 * then it is OK to just stuff it in since duplicate names are OK.
1341 * else only proceed if the new name does not exist and we're putting
1342 * it into a directory.
1343 */
1344 if (!(unlink_op || del_op || force ||
1345 shadows > 0 || !existing_target) ||
1346 new_dir->variant_type != YAFFS_OBJECT_TYPE_DIRECTORY)
1347 return YAFFS_FAIL;
1348
1349 yaffs_set_obj_name(obj, new_name);
1350 obj->dirty = 1;
1351 yaffs_add_obj_to_dir(new_dir, obj);
1352
1353 if (unlink_op)
1354 obj->unlinked = 1;
1355
1356 /* If it is a deletion then we mark it as a shrink for gc */
1357 if (yaffs_update_oh(obj, new_name, 0, del_op, shadows, NULL) >= 0)
1358 return YAFFS_OK;
1359
1360 return YAFFS_FAIL;
1361}
1362
1363/*------------------------ Short Operations Cache ------------------------------
1364 * In many situations where there is no high level buffering a lot of
1365 * reads might be short sequential reads, and a lot of writes may be short
1366 * sequential writes. eg. scanning/writing a jpeg file.
1367 * In these cases, a short read/write cache can provide a huge perfomance
1368 * benefit with dumb-as-a-rock code.
1369 * In Linux, the page cache provides read buffering and the short op cache
1370 * provides write buffering.
1371 *
1372 * There are a small number (~10) of cache chunks per device so that we don't
1373 * need a very intelligent search.
1374 */
1375
1376static int yaffs_obj_cache_dirty(struct yaffs_obj *obj)
1377{
1378 struct yaffs_dev *dev = obj->my_dev;
1379 int i;
1380 struct yaffs_cache *cache;
1381 int n_caches = obj->my_dev->param.n_caches;
1382
1383 for (i = 0; i < n_caches; i++) {
1384 cache = &dev->cache[i];
1385 if (cache->object == obj && cache->dirty)
1386 return 1;
1387 }
1388
1389 return 0;
1390}
1391
1392static void yaffs_flush_file_cache(struct yaffs_obj *obj)
1393{
1394 struct yaffs_dev *dev = obj->my_dev;
1395 int lowest = -99; /* Stop compiler whining. */
1396 int i;
1397 struct yaffs_cache *cache;
1398 int chunk_written = 0;
1399 int n_caches = obj->my_dev->param.n_caches;
1400
1401 if (n_caches < 1)
1402 return;
1403 do {
1404 cache = NULL;
1405
1406 /* Find the lowest dirty chunk for this object */
1407 for (i = 0; i < n_caches; i++) {
1408 if (dev->cache[i].object == obj &&
1409 dev->cache[i].dirty) {
1410 if (!cache ||
1411 dev->cache[i].chunk_id < lowest) {
1412 cache = &dev->cache[i];
1413 lowest = cache->chunk_id;
1414 }
1415 }
1416 }
1417
1418 if (cache && !cache->locked) {
1419 /* Write it out and free it up */
1420 chunk_written =
1421 yaffs_wr_data_obj(cache->object,
1422 cache->chunk_id,
1423 cache->data,
1424 cache->n_bytes, 1);
1425 cache->dirty = 0;
1426 cache->object = NULL;
1427 }
1428 } while (cache && chunk_written > 0);
1429
1430 if (cache)
1431 /* Hoosterman, disk full while writing cache out. */
1432 yaffs_trace(YAFFS_TRACE_ERROR,
1433 "yaffs tragedy: no space during cache write");
1434}
1435
1436/*yaffs_flush_whole_cache(dev)
1437 *
1438 *
1439 */
1440
1441void yaffs_flush_whole_cache(struct yaffs_dev *dev)
1442{
1443 struct yaffs_obj *obj;
1444 int n_caches = dev->param.n_caches;
1445 int i;
1446
1447 /* Find a dirty object in the cache and flush it...
1448 * until there are no further dirty objects.
1449 */
1450 do {
1451 obj = NULL;
1452 for (i = 0; i < n_caches && !obj; i++) {
1453 if (dev->cache[i].object && dev->cache[i].dirty)
1454 obj = dev->cache[i].object;
1455 }
1456 if (obj)
1457 yaffs_flush_file_cache(obj);
1458 } while (obj);
William Juul0e8cc8b2007-11-15 11:13:05 +01001459
1460}
1461
Charles Manning753ac612012-05-09 16:55:17 +00001462/* Grab us a cache chunk for use.
1463 * First look for an empty one.
1464 * Then look for the least recently used non-dirty one.
1465 * Then look for the least recently used dirty one...., flush and look again.
1466 */
1467static struct yaffs_cache *yaffs_grab_chunk_worker(struct yaffs_dev *dev)
William Juul0e8cc8b2007-11-15 11:13:05 +01001468{
Charles Manning753ac612012-05-09 16:55:17 +00001469 int i;
1470
1471 if (dev->param.n_caches > 0) {
1472 for (i = 0; i < dev->param.n_caches; i++) {
1473 if (!dev->cache[i].object)
1474 return &dev->cache[i];
William Juul0e8cc8b2007-11-15 11:13:05 +01001475 }
1476 }
Charles Manning753ac612012-05-09 16:55:17 +00001477 return NULL;
1478}
1479
1480static struct yaffs_cache *yaffs_grab_chunk_cache(struct yaffs_dev *dev)
1481{
1482 struct yaffs_cache *cache;
1483 struct yaffs_obj *the_obj;
1484 int usage;
1485 int i;
Charles Manning753ac612012-05-09 16:55:17 +00001486
1487 if (dev->param.n_caches < 1)
1488 return NULL;
1489
1490 /* Try find a non-dirty one... */
1491
1492 cache = yaffs_grab_chunk_worker(dev);
1493
1494 if (!cache) {
1495 /* They were all dirty, find the LRU object and flush
1496 * its cache, then find again.
1497 * NB what's here is not very accurate,
1498 * we actually flush the object with the LRU chunk.
1499 */
1500
1501 /* With locking we can't assume we can use entry zero,
1502 * Set the_obj to a valid pointer for Coverity. */
1503 the_obj = dev->cache[0].object;
1504 usage = -1;
1505 cache = NULL;
Charles Manning753ac612012-05-09 16:55:17 +00001506
1507 for (i = 0; i < dev->param.n_caches; i++) {
1508 if (dev->cache[i].object &&
1509 !dev->cache[i].locked &&
1510 (dev->cache[i].last_use < usage ||
1511 !cache)) {
1512 usage = dev->cache[i].last_use;
1513 the_obj = dev->cache[i].object;
1514 cache = &dev->cache[i];
Charles Manning753ac612012-05-09 16:55:17 +00001515 }
1516 }
1517
1518 if (!cache || cache->dirty) {
1519 /* Flush and try again */
1520 yaffs_flush_file_cache(the_obj);
1521 cache = yaffs_grab_chunk_worker(dev);
1522 }
1523 }
1524 return cache;
1525}
1526
1527/* Find a cached chunk */
1528static struct yaffs_cache *yaffs_find_chunk_cache(const struct yaffs_obj *obj,
1529 int chunk_id)
1530{
1531 struct yaffs_dev *dev = obj->my_dev;
1532 int i;
1533
1534 if (dev->param.n_caches < 1)
1535 return NULL;
1536
1537 for (i = 0; i < dev->param.n_caches; i++) {
1538 if (dev->cache[i].object == obj &&
1539 dev->cache[i].chunk_id == chunk_id) {
1540 dev->cache_hits++;
1541
1542 return &dev->cache[i];
1543 }
1544 }
1545 return NULL;
1546}
1547
1548/* Mark the chunk for the least recently used algorithym */
1549static void yaffs_use_cache(struct yaffs_dev *dev, struct yaffs_cache *cache,
1550 int is_write)
1551{
1552 int i;
1553
1554 if (dev->param.n_caches < 1)
1555 return;
1556
1557 if (dev->cache_last_use < 0 ||
1558 dev->cache_last_use > 100000000) {
1559 /* Reset the cache usages */
1560 for (i = 1; i < dev->param.n_caches; i++)
1561 dev->cache[i].last_use = 0;
1562
1563 dev->cache_last_use = 0;
1564 }
1565 dev->cache_last_use++;
1566 cache->last_use = dev->cache_last_use;
1567
1568 if (is_write)
1569 cache->dirty = 1;
1570}
1571
1572/* Invalidate a single cache page.
1573 * Do this when a whole page gets written,
1574 * ie the short cache for this page is no longer valid.
1575 */
1576static void yaffs_invalidate_chunk_cache(struct yaffs_obj *object, int chunk_id)
1577{
1578 struct yaffs_cache *cache;
1579
1580 if (object->my_dev->param.n_caches > 0) {
1581 cache = yaffs_find_chunk_cache(object, chunk_id);
1582
1583 if (cache)
1584 cache->object = NULL;
1585 }
1586}
1587
1588/* Invalidate all the cache pages associated with this object
1589 * Do this whenever ther file is deleted or resized.
1590 */
1591static void yaffs_invalidate_whole_cache(struct yaffs_obj *in)
1592{
1593 int i;
1594 struct yaffs_dev *dev = in->my_dev;
1595
1596 if (dev->param.n_caches > 0) {
1597 /* Invalidate it. */
1598 for (i = 0; i < dev->param.n_caches; i++) {
1599 if (dev->cache[i].object == in)
1600 dev->cache[i].object = NULL;
1601 }
1602 }
1603}
1604
1605static void yaffs_unhash_obj(struct yaffs_obj *obj)
1606{
1607 int bucket;
1608 struct yaffs_dev *dev = obj->my_dev;
1609
1610 /* If it is still linked into the bucket list, free from the list */
1611 if (!list_empty(&obj->hash_link)) {
1612 list_del_init(&obj->hash_link);
1613 bucket = yaffs_hash_fn(obj->obj_id);
1614 dev->obj_bucket[bucket].count--;
1615 }
1616}
1617
1618/* FreeObject frees up a Object and puts it back on the free list */
1619static void yaffs_free_obj(struct yaffs_obj *obj)
1620{
1621 struct yaffs_dev *dev;
1622
1623 if (!obj) {
1624 BUG();
1625 return;
1626 }
1627 dev = obj->my_dev;
1628 yaffs_trace(YAFFS_TRACE_OS, "FreeObject %p inode %p",
1629 obj, obj->my_inode);
1630 if (obj->parent)
1631 BUG();
1632 if (!list_empty(&obj->siblings))
1633 BUG();
1634
1635 if (obj->my_inode) {
1636 /* We're still hooked up to a cached inode.
1637 * Don't delete now, but mark for later deletion
1638 */
1639 obj->defered_free = 1;
1640 return;
1641 }
1642
1643 yaffs_unhash_obj(obj);
1644
1645 yaffs_free_raw_obj(dev, obj);
1646 dev->n_obj--;
1647 dev->checkpoint_blocks_required = 0; /* force recalculation */
1648}
1649
1650void yaffs_handle_defered_free(struct yaffs_obj *obj)
1651{
1652 if (obj->defered_free)
1653 yaffs_free_obj(obj);
1654}
1655
1656static int yaffs_generic_obj_del(struct yaffs_obj *in)
1657{
1658 /* Iinvalidate the file's data in the cache, without flushing. */
1659 yaffs_invalidate_whole_cache(in);
1660
1661 if (in->my_dev->param.is_yaffs2 && in->parent != in->my_dev->del_dir) {
1662 /* Move to unlinked directory so we have a deletion record */
1663 yaffs_change_obj_name(in, in->my_dev->del_dir, _Y("deleted"), 0,
1664 0);
1665 }
1666
1667 yaffs_remove_obj_from_dir(in);
1668 yaffs_chunk_del(in->my_dev, in->hdr_chunk, 1, __LINE__);
1669 in->hdr_chunk = 0;
1670
1671 yaffs_free_obj(in);
1672 return YAFFS_OK;
1673
1674}
1675
1676static void yaffs_soft_del_file(struct yaffs_obj *obj)
1677{
1678 if (!obj->deleted ||
1679 obj->variant_type != YAFFS_OBJECT_TYPE_FILE ||
1680 obj->soft_del)
1681 return;
1682
1683 if (obj->n_data_chunks <= 0) {
1684 /* Empty file with no duplicate object headers,
1685 * just delete it immediately */
1686 yaffs_free_tnode(obj->my_dev, obj->variant.file_variant.top);
1687 obj->variant.file_variant.top = NULL;
1688 yaffs_trace(YAFFS_TRACE_TRACING,
1689 "yaffs: Deleting empty file %d",
1690 obj->obj_id);
1691 yaffs_generic_obj_del(obj);
1692 } else {
1693 yaffs_soft_del_worker(obj,
1694 obj->variant.file_variant.top,
1695 obj->variant.
1696 file_variant.top_level, 0);
1697 obj->soft_del = 1;
1698 }
William Juul0e8cc8b2007-11-15 11:13:05 +01001699}
1700
1701/* Pruning removes any part of the file structure tree that is beyond the
1702 * bounds of the file (ie that does not point to chunks).
1703 *
1704 * A file should only get pruned when its size is reduced.
1705 *
1706 * Before pruning, the chunks must be pulled from the tree and the
1707 * level 0 tnode entries must be zeroed out.
1708 * Could also use this for file deletion, but that's probably better handled
1709 * by a special case.
Charles Manning753ac612012-05-09 16:55:17 +00001710 *
1711 * This function is recursive. For levels > 0 the function is called again on
1712 * any sub-tree. For level == 0 we just check if the sub-tree has data.
1713 * If there is no data in a subtree then it is pruned.
William Juul0e8cc8b2007-11-15 11:13:05 +01001714 */
1715
Charles Manning753ac612012-05-09 16:55:17 +00001716static struct yaffs_tnode *yaffs_prune_worker(struct yaffs_dev *dev,
1717 struct yaffs_tnode *tn, u32 level,
1718 int del0)
William Juul0e8cc8b2007-11-15 11:13:05 +01001719{
1720 int i;
Charles Manning753ac612012-05-09 16:55:17 +00001721 int has_data;
William Juul0e8cc8b2007-11-15 11:13:05 +01001722
Charles Manning753ac612012-05-09 16:55:17 +00001723 if (!tn)
1724 return tn;
William Juul0e8cc8b2007-11-15 11:13:05 +01001725
Charles Manning753ac612012-05-09 16:55:17 +00001726 has_data = 0;
1727
1728 if (level > 0) {
William Juul0e8cc8b2007-11-15 11:13:05 +01001729 for (i = 0; i < YAFFS_NTNODES_INTERNAL; i++) {
William Juul0e8cc8b2007-11-15 11:13:05 +01001730 if (tn->internal[i]) {
Charles Manning753ac612012-05-09 16:55:17 +00001731 tn->internal[i] =
1732 yaffs_prune_worker(dev,
1733 tn->internal[i],
1734 level - 1,
1735 (i == 0) ? del0 : 1);
William Juul0e8cc8b2007-11-15 11:13:05 +01001736 }
Charles Manning753ac612012-05-09 16:55:17 +00001737
1738 if (tn->internal[i])
1739 has_data++;
William Juul0e8cc8b2007-11-15 11:13:05 +01001740 }
Charles Manning753ac612012-05-09 16:55:17 +00001741 } else {
1742 int tnode_size_u32 = dev->tnode_size / sizeof(u32);
1743 u32 *map = (u32 *) tn;
William Juul0e8cc8b2007-11-15 11:13:05 +01001744
Charles Manning753ac612012-05-09 16:55:17 +00001745 for (i = 0; !has_data && i < tnode_size_u32; i++) {
1746 if (map[i])
1747 has_data++;
William Juul0e8cc8b2007-11-15 11:13:05 +01001748 }
William Juul0e8cc8b2007-11-15 11:13:05 +01001749 }
1750
Charles Manning753ac612012-05-09 16:55:17 +00001751 if (has_data == 0 && del0) {
1752 /* Free and return NULL */
1753 yaffs_free_tnode(dev, tn);
1754 tn = NULL;
1755 }
William Juul0e8cc8b2007-11-15 11:13:05 +01001756 return tn;
William Juul0e8cc8b2007-11-15 11:13:05 +01001757}
1758
Charles Manning753ac612012-05-09 16:55:17 +00001759static int yaffs_prune_tree(struct yaffs_dev *dev,
1760 struct yaffs_file_var *file_struct)
William Juul0e8cc8b2007-11-15 11:13:05 +01001761{
1762 int i;
Charles Manning753ac612012-05-09 16:55:17 +00001763 int has_data;
William Juul0e8cc8b2007-11-15 11:13:05 +01001764 int done = 0;
Charles Manning753ac612012-05-09 16:55:17 +00001765 struct yaffs_tnode *tn;
William Juul0e8cc8b2007-11-15 11:13:05 +01001766
Charles Manning753ac612012-05-09 16:55:17 +00001767 if (file_struct->top_level < 1)
1768 return YAFFS_OK;
William Juul0e8cc8b2007-11-15 11:13:05 +01001769
Charles Manning753ac612012-05-09 16:55:17 +00001770 file_struct->top =
1771 yaffs_prune_worker(dev, file_struct->top, file_struct->top_level, 0);
William Juul0e8cc8b2007-11-15 11:13:05 +01001772
Charles Manning753ac612012-05-09 16:55:17 +00001773 /* Now we have a tree with all the non-zero branches NULL but
1774 * the height is the same as it was.
1775 * Let's see if we can trim internal tnodes to shorten the tree.
1776 * We can do this if only the 0th element in the tnode is in use
1777 * (ie all the non-zero are NULL)
1778 */
William Juul0e8cc8b2007-11-15 11:13:05 +01001779
Charles Manning753ac612012-05-09 16:55:17 +00001780 while (file_struct->top_level && !done) {
1781 tn = file_struct->top;
William Juul0e8cc8b2007-11-15 11:13:05 +01001782
Charles Manning753ac612012-05-09 16:55:17 +00001783 has_data = 0;
1784 for (i = 1; i < YAFFS_NTNODES_INTERNAL; i++) {
1785 if (tn->internal[i])
1786 has_data++;
1787 }
1788
1789 if (!has_data) {
1790 file_struct->top = tn->internal[0];
1791 file_struct->top_level--;
1792 yaffs_free_tnode(dev, tn);
1793 } else {
1794 done = 1;
William Juul0e8cc8b2007-11-15 11:13:05 +01001795 }
1796 }
1797
1798 return YAFFS_OK;
1799}
1800
1801/*-------------------- End of File Structure functions.-------------------*/
1802
Charles Manning753ac612012-05-09 16:55:17 +00001803/* alloc_empty_obj gets us a clean Object.*/
1804static struct yaffs_obj *yaffs_alloc_empty_obj(struct yaffs_dev *dev)
William Juul0e8cc8b2007-11-15 11:13:05 +01001805{
Charles Manning753ac612012-05-09 16:55:17 +00001806 struct yaffs_obj *obj = yaffs_alloc_raw_obj(dev);
William Juul0e8cc8b2007-11-15 11:13:05 +01001807
Charles Manning753ac612012-05-09 16:55:17 +00001808 if (!obj)
1809 return obj;
William Juul0e8cc8b2007-11-15 11:13:05 +01001810
Charles Manning753ac612012-05-09 16:55:17 +00001811 dev->n_obj++;
William Juul0e8cc8b2007-11-15 11:13:05 +01001812
Charles Manning753ac612012-05-09 16:55:17 +00001813 /* Now sweeten it up... */
1814
1815 memset(obj, 0, sizeof(struct yaffs_obj));
1816 obj->being_created = 1;
1817
1818 obj->my_dev = dev;
1819 obj->hdr_chunk = 0;
1820 obj->variant_type = YAFFS_OBJECT_TYPE_UNKNOWN;
1821 INIT_LIST_HEAD(&(obj->hard_links));
1822 INIT_LIST_HEAD(&(obj->hash_link));
1823 INIT_LIST_HEAD(&obj->siblings);
1824
1825 /* Now make the directory sane */
1826 if (dev->root_dir) {
1827 obj->parent = dev->root_dir;
1828 list_add(&(obj->siblings),
1829 &dev->root_dir->variant.dir_variant.children);
William Juul0e8cc8b2007-11-15 11:13:05 +01001830 }
Wolfgang Denk4b070802008-08-14 14:41:06 +02001831
Charles Manning753ac612012-05-09 16:55:17 +00001832 /* Add it to the lost and found directory.
1833 * NB Can't put root or lost-n-found in lost-n-found so
1834 * check if lost-n-found exists first
1835 */
1836 if (dev->lost_n_found)
1837 yaffs_add_obj_to_dir(dev->lost_n_found, obj);
William Juul0e8cc8b2007-11-15 11:13:05 +01001838
Charles Manning753ac612012-05-09 16:55:17 +00001839 obj->being_created = 0;
William Juul0e8cc8b2007-11-15 11:13:05 +01001840
Charles Manning753ac612012-05-09 16:55:17 +00001841 dev->checkpoint_blocks_required = 0; /* force recalculation */
William Juul0e8cc8b2007-11-15 11:13:05 +01001842
1843 return obj;
William Juul0e8cc8b2007-11-15 11:13:05 +01001844}
1845
Charles Manning753ac612012-05-09 16:55:17 +00001846static int yaffs_find_nice_bucket(struct yaffs_dev *dev)
William Juul0e8cc8b2007-11-15 11:13:05 +01001847{
William Juul0e8cc8b2007-11-15 11:13:05 +01001848 int i;
1849 int l = 999;
1850 int lowest = 999999;
1851
Charles Manning753ac612012-05-09 16:55:17 +00001852 /* Search for the shortest list or one that
1853 * isn't too long.
William Juul0e8cc8b2007-11-15 11:13:05 +01001854 */
1855
Charles Manning753ac612012-05-09 16:55:17 +00001856 for (i = 0; i < 10 && lowest > 4; i++) {
1857 dev->bucket_finder++;
1858 dev->bucket_finder %= YAFFS_NOBJECT_BUCKETS;
1859 if (dev->obj_bucket[dev->bucket_finder].count < lowest) {
1860 lowest = dev->obj_bucket[dev->bucket_finder].count;
1861 l = dev->bucket_finder;
William Juul0e8cc8b2007-11-15 11:13:05 +01001862 }
William Juul0e8cc8b2007-11-15 11:13:05 +01001863 }
1864
1865 return l;
1866}
1867
Charles Manning753ac612012-05-09 16:55:17 +00001868static int yaffs_new_obj_id(struct yaffs_dev *dev)
William Juul0e8cc8b2007-11-15 11:13:05 +01001869{
Charles Manning753ac612012-05-09 16:55:17 +00001870 int bucket = yaffs_find_nice_bucket(dev);
1871 int found = 0;
1872 struct list_head *i;
1873 u32 n = (u32) bucket;
William Juul0e8cc8b2007-11-15 11:13:05 +01001874
1875 /* Now find an object value that has not already been taken
1876 * by scanning the list.
1877 */
1878
William Juul0e8cc8b2007-11-15 11:13:05 +01001879 while (!found) {
1880 found = 1;
1881 n += YAFFS_NOBJECT_BUCKETS;
Charles Manning753ac612012-05-09 16:55:17 +00001882 if (1 || dev->obj_bucket[bucket].count > 0) {
1883 list_for_each(i, &dev->obj_bucket[bucket].list) {
William Juul0e8cc8b2007-11-15 11:13:05 +01001884 /* If there is already one in the list */
Charles Manning753ac612012-05-09 16:55:17 +00001885 if (i && list_entry(i, struct yaffs_obj,
1886 hash_link)->obj_id == n) {
William Juul0e8cc8b2007-11-15 11:13:05 +01001887 found = 0;
1888 }
1889 }
1890 }
1891 }
William Juul0e8cc8b2007-11-15 11:13:05 +01001892 return n;
1893}
1894
Charles Manning753ac612012-05-09 16:55:17 +00001895static void yaffs_hash_obj(struct yaffs_obj *in)
William Juul0e8cc8b2007-11-15 11:13:05 +01001896{
Charles Manning753ac612012-05-09 16:55:17 +00001897 int bucket = yaffs_hash_fn(in->obj_id);
1898 struct yaffs_dev *dev = in->my_dev;
William Juul0e8cc8b2007-11-15 11:13:05 +01001899
Charles Manning753ac612012-05-09 16:55:17 +00001900 list_add(&in->hash_link, &dev->obj_bucket[bucket].list);
1901 dev->obj_bucket[bucket].count++;
William Juul0e8cc8b2007-11-15 11:13:05 +01001902}
1903
Charles Manning753ac612012-05-09 16:55:17 +00001904struct yaffs_obj *yaffs_find_by_number(struct yaffs_dev *dev, u32 number)
William Juul0e8cc8b2007-11-15 11:13:05 +01001905{
Charles Manning753ac612012-05-09 16:55:17 +00001906 int bucket = yaffs_hash_fn(number);
William Juul0e8cc8b2007-11-15 11:13:05 +01001907 struct list_head *i;
Charles Manning753ac612012-05-09 16:55:17 +00001908 struct yaffs_obj *in;
William Juul0e8cc8b2007-11-15 11:13:05 +01001909
Charles Manning753ac612012-05-09 16:55:17 +00001910 list_for_each(i, &dev->obj_bucket[bucket].list) {
William Juul0e8cc8b2007-11-15 11:13:05 +01001911 /* Look if it is in the list */
Charles Manning753ac612012-05-09 16:55:17 +00001912 in = list_entry(i, struct yaffs_obj, hash_link);
1913 if (in->obj_id == number) {
1914 /* Don't show if it is defered free */
1915 if (in->defered_free)
1916 return NULL;
1917 return in;
William Juul0e8cc8b2007-11-15 11:13:05 +01001918 }
1919 }
1920
1921 return NULL;
1922}
1923
Charles Manning753ac612012-05-09 16:55:17 +00001924struct yaffs_obj *yaffs_new_obj(struct yaffs_dev *dev, int number,
1925 enum yaffs_obj_type type)
William Juul0e8cc8b2007-11-15 11:13:05 +01001926{
Charles Manning753ac612012-05-09 16:55:17 +00001927 struct yaffs_obj *the_obj = NULL;
1928 struct yaffs_tnode *tn = NULL;
William Juul0e8cc8b2007-11-15 11:13:05 +01001929
Charles Manning753ac612012-05-09 16:55:17 +00001930 if (number < 0)
1931 number = yaffs_new_obj_id(dev);
William Juul0e8cc8b2007-11-15 11:13:05 +01001932
Charles Manning753ac612012-05-09 16:55:17 +00001933 if (type == YAFFS_OBJECT_TYPE_FILE) {
1934 tn = yaffs_get_tnode(dev);
1935 if (!tn)
1936 return NULL;
William Juul0e8cc8b2007-11-15 11:13:05 +01001937 }
1938
Charles Manning753ac612012-05-09 16:55:17 +00001939 the_obj = yaffs_alloc_empty_obj(dev);
1940 if (!the_obj) {
1941 if (tn)
1942 yaffs_free_tnode(dev, tn);
1943 return NULL;
1944 }
1945
1946 the_obj->fake = 0;
1947 the_obj->rename_allowed = 1;
1948 the_obj->unlink_allowed = 1;
1949 the_obj->obj_id = number;
1950 yaffs_hash_obj(the_obj);
1951 the_obj->variant_type = type;
1952 yaffs_load_current_time(the_obj, 1, 1);
1953
1954 switch (type) {
1955 case YAFFS_OBJECT_TYPE_FILE:
1956 the_obj->variant.file_variant.file_size = 0;
1957 the_obj->variant.file_variant.scanned_size = 0;
1958 the_obj->variant.file_variant.shrink_size =
1959 yaffs_max_file_size(dev);
1960 the_obj->variant.file_variant.top_level = 0;
1961 the_obj->variant.file_variant.top = tn;
1962 break;
1963 case YAFFS_OBJECT_TYPE_DIRECTORY:
1964 INIT_LIST_HEAD(&the_obj->variant.dir_variant.children);
1965 INIT_LIST_HEAD(&the_obj->variant.dir_variant.dirty);
1966 break;
1967 case YAFFS_OBJECT_TYPE_SYMLINK:
1968 case YAFFS_OBJECT_TYPE_HARDLINK:
1969 case YAFFS_OBJECT_TYPE_SPECIAL:
1970 /* No action required */
1971 break;
1972 case YAFFS_OBJECT_TYPE_UNKNOWN:
1973 /* todo this should not happen */
1974 break;
1975 }
1976 return the_obj;
1977}
1978
1979static struct yaffs_obj *yaffs_create_fake_dir(struct yaffs_dev *dev,
1980 int number, u32 mode)
1981{
1982
1983 struct yaffs_obj *obj =
1984 yaffs_new_obj(dev, number, YAFFS_OBJECT_TYPE_DIRECTORY);
1985
1986 if (!obj)
William Juul0e8cc8b2007-11-15 11:13:05 +01001987 return NULL;
Wolfgang Denk4b070802008-08-14 14:41:06 +02001988
Charles Manning753ac612012-05-09 16:55:17 +00001989 obj->fake = 1; /* it is fake so it might not use NAND */
1990 obj->rename_allowed = 0;
1991 obj->unlink_allowed = 0;
1992 obj->deleted = 0;
1993 obj->unlinked = 0;
1994 obj->yst_mode = mode;
1995 obj->my_dev = dev;
1996 obj->hdr_chunk = 0; /* Not a valid chunk. */
1997 return obj;
William Juul0e8cc8b2007-11-15 11:13:05 +01001998
1999}
Wolfgang Denk4b070802008-08-14 14:41:06 +02002000
William Juul0e8cc8b2007-11-15 11:13:05 +01002001
Charles Manning753ac612012-05-09 16:55:17 +00002002static void yaffs_init_tnodes_and_objs(struct yaffs_dev *dev)
William Juul0e8cc8b2007-11-15 11:13:05 +01002003{
Charles Manning753ac612012-05-09 16:55:17 +00002004 int i;
William Juul0e8cc8b2007-11-15 11:13:05 +01002005
Charles Manning753ac612012-05-09 16:55:17 +00002006 dev->n_obj = 0;
2007 dev->n_tnodes = 0;
2008 yaffs_init_raw_tnodes_and_objs(dev);
2009
2010 for (i = 0; i < YAFFS_NOBJECT_BUCKETS; i++) {
2011 INIT_LIST_HEAD(&dev->obj_bucket[i].list);
2012 dev->obj_bucket[i].count = 0;
William Juul0e8cc8b2007-11-15 11:13:05 +01002013 }
Charles Manning753ac612012-05-09 16:55:17 +00002014}
William Juul0e8cc8b2007-11-15 11:13:05 +01002015
Charles Manning753ac612012-05-09 16:55:17 +00002016struct yaffs_obj *yaffs_find_or_create_by_number(struct yaffs_dev *dev,
2017 int number,
2018 enum yaffs_obj_type type)
2019{
2020 struct yaffs_obj *the_obj = NULL;
William Juul0e8cc8b2007-11-15 11:13:05 +01002021
Charles Manning753ac612012-05-09 16:55:17 +00002022 if (number > 0)
2023 the_obj = yaffs_find_by_number(dev, number);
2024
2025 if (!the_obj)
2026 the_obj = yaffs_new_obj(dev, number, type);
2027
2028 return the_obj;
2029
2030}
2031
2032YCHAR *yaffs_clone_str(const YCHAR *str)
2033{
2034 YCHAR *new_str = NULL;
2035 int len;
2036
2037 if (!str)
2038 str = _Y("");
2039
2040 len = yaffs_strnlen(str, YAFFS_MAX_ALIAS_LENGTH);
2041 new_str = kmalloc((len + 1) * sizeof(YCHAR), GFP_NOFS);
2042 if (new_str) {
2043 yaffs_strncpy(new_str, str, len);
2044 new_str[len] = 0;
2045 }
2046 return new_str;
2047
2048}
2049/*
2050 *yaffs_update_parent() handles fixing a directories mtime and ctime when a new
2051 * link (ie. name) is created or deleted in the directory.
2052 *
2053 * ie.
2054 * create dir/a : update dir's mtime/ctime
2055 * rm dir/a: update dir's mtime/ctime
2056 * modify dir/a: don't update dir's mtimme/ctime
2057 *
2058 * This can be handled immediately or defered. Defering helps reduce the number
2059 * of updates when many files in a directory are changed within a brief period.
2060 *
2061 * If the directory updating is defered then yaffs_update_dirty_dirs must be
2062 * called periodically.
2063 */
2064
2065static void yaffs_update_parent(struct yaffs_obj *obj)
2066{
2067 struct yaffs_dev *dev;
2068
2069 if (!obj)
2070 return;
2071 dev = obj->my_dev;
2072 obj->dirty = 1;
2073 yaffs_load_current_time(obj, 0, 1);
2074 if (dev->param.defered_dir_update) {
2075 struct list_head *link = &obj->variant.dir_variant.dirty;
2076
2077 if (list_empty(link)) {
2078 list_add(link, &dev->dirty_dirs);
2079 yaffs_trace(YAFFS_TRACE_BACKGROUND,
2080 "Added object %d to dirty directories",
2081 obj->obj_id);
2082 }
2083
2084 } else {
2085 yaffs_update_oh(obj, NULL, 0, 0, 0, NULL);
2086 }
2087}
2088
2089void yaffs_update_dirty_dirs(struct yaffs_dev *dev)
2090{
2091 struct list_head *link;
2092 struct yaffs_obj *obj;
2093 struct yaffs_dir_var *d_s;
2094 union yaffs_obj_var *o_v;
2095
2096 yaffs_trace(YAFFS_TRACE_BACKGROUND, "Update dirty directories");
2097
2098 while (!list_empty(&dev->dirty_dirs)) {
2099 link = dev->dirty_dirs.next;
2100 list_del_init(link);
2101
2102 d_s = list_entry(link, struct yaffs_dir_var, dirty);
2103 o_v = list_entry(d_s, union yaffs_obj_var, dir_variant);
2104 obj = list_entry(o_v, struct yaffs_obj, variant);
2105
2106 yaffs_trace(YAFFS_TRACE_BACKGROUND, "Update directory %d",
2107 obj->obj_id);
2108
2109 if (obj->dirty)
2110 yaffs_update_oh(obj, NULL, 0, 0, 0, NULL);
2111 }
William Juul0e8cc8b2007-11-15 11:13:05 +01002112}
2113
2114/*
2115 * Mknod (create) a new object.
Charles Manning753ac612012-05-09 16:55:17 +00002116 * equiv_obj only has meaning for a hard link;
2117 * alias_str only has meaning for a symlink.
William Juul0e8cc8b2007-11-15 11:13:05 +01002118 * rdev only has meaning for devices (a subset of special objects)
2119 */
Wolfgang Denk4b070802008-08-14 14:41:06 +02002120
Charles Manning753ac612012-05-09 16:55:17 +00002121static struct yaffs_obj *yaffs_create_obj(enum yaffs_obj_type type,
2122 struct yaffs_obj *parent,
2123 const YCHAR *name,
2124 u32 mode,
2125 u32 uid,
2126 u32 gid,
2127 struct yaffs_obj *equiv_obj,
2128 const YCHAR *alias_str, u32 rdev)
William Juul0e8cc8b2007-11-15 11:13:05 +01002129{
Charles Manning753ac612012-05-09 16:55:17 +00002130 struct yaffs_obj *in;
Wolfgang Denk068d6f92011-09-08 02:10:22 +00002131 YCHAR *str = NULL;
Charles Manning753ac612012-05-09 16:55:17 +00002132 struct yaffs_dev *dev = parent->my_dev;
William Juul0e8cc8b2007-11-15 11:13:05 +01002133
Charles Manning753ac612012-05-09 16:55:17 +00002134 /* Check if the entry exists.
2135 * If it does then fail the call since we don't want a dup. */
2136 if (yaffs_find_by_name(parent, name))
2137 return NULL;
William Juul0e8cc8b2007-11-15 11:13:05 +01002138
Charles Manning753ac612012-05-09 16:55:17 +00002139 if (type == YAFFS_OBJECT_TYPE_SYMLINK) {
2140 str = yaffs_clone_str(alias_str);
2141 if (!str)
2142 return NULL;
2143 }
2144
2145 in = yaffs_new_obj(dev, -1, type);
2146
2147 if (!in) {
2148 kfree(str);
William Juul0e8cc8b2007-11-15 11:13:05 +01002149 return NULL;
2150 }
2151
Charles Manning753ac612012-05-09 16:55:17 +00002152 in->hdr_chunk = 0;
2153 in->valid = 1;
2154 in->variant_type = type;
Wolfgang Denk4b070802008-08-14 14:41:06 +02002155
Charles Manning753ac612012-05-09 16:55:17 +00002156 in->yst_mode = mode;
2157
2158 yaffs_attribs_init(in, gid, uid, rdev);
2159
2160 in->n_data_chunks = 0;
2161
2162 yaffs_set_obj_name(in, name);
2163 in->dirty = 1;
2164
2165 yaffs_add_obj_to_dir(parent, in);
2166
2167 in->my_dev = parent->my_dev;
2168
2169 switch (type) {
2170 case YAFFS_OBJECT_TYPE_SYMLINK:
2171 in->variant.symlink_variant.alias = str;
2172 break;
2173 case YAFFS_OBJECT_TYPE_HARDLINK:
2174 in->variant.hardlink_variant.equiv_obj = equiv_obj;
2175 in->variant.hardlink_variant.equiv_id = equiv_obj->obj_id;
2176 list_add(&in->hard_links, &equiv_obj->hard_links);
2177 break;
2178 case YAFFS_OBJECT_TYPE_FILE:
2179 case YAFFS_OBJECT_TYPE_DIRECTORY:
2180 case YAFFS_OBJECT_TYPE_SPECIAL:
2181 case YAFFS_OBJECT_TYPE_UNKNOWN:
2182 /* do nothing */
2183 break;
William Juul0e8cc8b2007-11-15 11:13:05 +01002184 }
Wolfgang Denk4b070802008-08-14 14:41:06 +02002185
Charles Manning753ac612012-05-09 16:55:17 +00002186 if (yaffs_update_oh(in, name, 0, 0, 0, NULL) < 0) {
2187 /* Could not create the object header, fail */
2188 yaffs_del_obj(in);
2189 in = NULL;
William Juul0e8cc8b2007-11-15 11:13:05 +01002190 }
2191
Charles Manning753ac612012-05-09 16:55:17 +00002192 if (in)
2193 yaffs_update_parent(parent);
2194
William Juul0e8cc8b2007-11-15 11:13:05 +01002195 return in;
2196}
2197
Charles Manning753ac612012-05-09 16:55:17 +00002198struct yaffs_obj *yaffs_create_file(struct yaffs_obj *parent,
2199 const YCHAR *name, u32 mode, u32 uid,
2200 u32 gid)
William Juul0e8cc8b2007-11-15 11:13:05 +01002201{
Charles Manning753ac612012-05-09 16:55:17 +00002202 return yaffs_create_obj(YAFFS_OBJECT_TYPE_FILE, parent, name, mode,
2203 uid, gid, NULL, NULL, 0);
William Juul0e8cc8b2007-11-15 11:13:05 +01002204}
2205
Charles Manning753ac612012-05-09 16:55:17 +00002206struct yaffs_obj *yaffs_create_dir(struct yaffs_obj *parent, const YCHAR *name,
2207 u32 mode, u32 uid, u32 gid)
William Juul0e8cc8b2007-11-15 11:13:05 +01002208{
Charles Manning753ac612012-05-09 16:55:17 +00002209 return yaffs_create_obj(YAFFS_OBJECT_TYPE_DIRECTORY, parent, name,
2210 mode, uid, gid, NULL, NULL, 0);
William Juul0e8cc8b2007-11-15 11:13:05 +01002211}
2212
Charles Manning753ac612012-05-09 16:55:17 +00002213struct yaffs_obj *yaffs_create_special(struct yaffs_obj *parent,
2214 const YCHAR *name, u32 mode, u32 uid,
2215 u32 gid, u32 rdev)
William Juul0e8cc8b2007-11-15 11:13:05 +01002216{
Charles Manning753ac612012-05-09 16:55:17 +00002217 return yaffs_create_obj(YAFFS_OBJECT_TYPE_SPECIAL, parent, name, mode,
2218 uid, gid, NULL, NULL, rdev);
William Juul0e8cc8b2007-11-15 11:13:05 +01002219}
2220
Charles Manning753ac612012-05-09 16:55:17 +00002221struct yaffs_obj *yaffs_create_symlink(struct yaffs_obj *parent,
2222 const YCHAR *name, u32 mode, u32 uid,
2223 u32 gid, const YCHAR *alias)
William Juul0e8cc8b2007-11-15 11:13:05 +01002224{
Charles Manning753ac612012-05-09 16:55:17 +00002225 return yaffs_create_obj(YAFFS_OBJECT_TYPE_SYMLINK, parent, name, mode,
2226 uid, gid, NULL, alias, 0);
William Juul0e8cc8b2007-11-15 11:13:05 +01002227}
2228
Charles Manning753ac612012-05-09 16:55:17 +00002229/* yaffs_link_obj returns the object id of the equivalent object.*/
2230struct yaffs_obj *yaffs_link_obj(struct yaffs_obj *parent, const YCHAR * name,
2231 struct yaffs_obj *equiv_obj)
William Juul0e8cc8b2007-11-15 11:13:05 +01002232{
Charles Manning753ac612012-05-09 16:55:17 +00002233 /* Get the real object in case we were fed a hard link obj */
2234 equiv_obj = yaffs_get_equivalent_obj(equiv_obj);
William Juul0e8cc8b2007-11-15 11:13:05 +01002235
Charles Manning753ac612012-05-09 16:55:17 +00002236 if (yaffs_create_obj(YAFFS_OBJECT_TYPE_HARDLINK,
2237 parent, name, 0, 0, 0,
2238 equiv_obj, NULL, 0))
2239 return equiv_obj;
2240
2241 return NULL;
William Juul0e8cc8b2007-11-15 11:13:05 +01002242
2243}
2244
Charles Manning753ac612012-05-09 16:55:17 +00002245
2246
2247/*---------------------- Block Management and Page Allocation -------------*/
2248
2249static void yaffs_deinit_blocks(struct yaffs_dev *dev)
William Juul0e8cc8b2007-11-15 11:13:05 +01002250{
Charles Manning753ac612012-05-09 16:55:17 +00002251 if (dev->block_info_alt && dev->block_info)
2252 vfree(dev->block_info);
2253 else
2254 kfree(dev->block_info);
William Juul0e8cc8b2007-11-15 11:13:05 +01002255
Charles Manning753ac612012-05-09 16:55:17 +00002256 dev->block_info_alt = 0;
William Juul0e8cc8b2007-11-15 11:13:05 +01002257
Charles Manning753ac612012-05-09 16:55:17 +00002258 dev->block_info = NULL;
William Juul0e8cc8b2007-11-15 11:13:05 +01002259
Charles Manning753ac612012-05-09 16:55:17 +00002260 if (dev->chunk_bits_alt && dev->chunk_bits)
2261 vfree(dev->chunk_bits);
2262 else
2263 kfree(dev->chunk_bits);
2264 dev->chunk_bits_alt = 0;
2265 dev->chunk_bits = NULL;
William Juul0e8cc8b2007-11-15 11:13:05 +01002266}
2267
Charles Manning753ac612012-05-09 16:55:17 +00002268static int yaffs_init_blocks(struct yaffs_dev *dev)
William Juul0e8cc8b2007-11-15 11:13:05 +01002269{
Charles Manning753ac612012-05-09 16:55:17 +00002270 int n_blocks = dev->internal_end_block - dev->internal_start_block + 1;
William Juul0e8cc8b2007-11-15 11:13:05 +01002271
Charles Manning753ac612012-05-09 16:55:17 +00002272 dev->block_info = NULL;
2273 dev->chunk_bits = NULL;
2274 dev->alloc_block = -1; /* force it to get a new one */
William Juul0e8cc8b2007-11-15 11:13:05 +01002275
2276 /* If the first allocation strategy fails, thry the alternate one */
Charles Manning753ac612012-05-09 16:55:17 +00002277 dev->block_info =
2278 kmalloc(n_blocks * sizeof(struct yaffs_block_info), GFP_NOFS);
2279 if (!dev->block_info) {
2280 dev->block_info =
2281 vmalloc(n_blocks * sizeof(struct yaffs_block_info));
2282 dev->block_info_alt = 1;
William Juul0e8cc8b2007-11-15 11:13:05 +01002283 } else {
Charles Manning753ac612012-05-09 16:55:17 +00002284 dev->block_info_alt = 0;
William Juul0e8cc8b2007-11-15 11:13:05 +01002285 }
2286
Charles Manning753ac612012-05-09 16:55:17 +00002287 if (!dev->block_info)
2288 goto alloc_error;
William Juul0e8cc8b2007-11-15 11:13:05 +01002289
Charles Manning753ac612012-05-09 16:55:17 +00002290 /* Set up dynamic blockinfo stuff. Round up bytes. */
2291 dev->chunk_bit_stride = (dev->param.chunks_per_block + 7) / 8;
2292 dev->chunk_bits =
2293 kmalloc(dev->chunk_bit_stride * n_blocks, GFP_NOFS);
2294 if (!dev->chunk_bits) {
2295 dev->chunk_bits =
2296 vmalloc(dev->chunk_bit_stride * n_blocks);
2297 dev->chunk_bits_alt = 1;
2298 } else {
2299 dev->chunk_bits_alt = 0;
William Juul0e8cc8b2007-11-15 11:13:05 +01002300 }
Charles Manning753ac612012-05-09 16:55:17 +00002301 if (!dev->chunk_bits)
2302 goto alloc_error;
William Juul0e8cc8b2007-11-15 11:13:05 +01002303
William Juul0e8cc8b2007-11-15 11:13:05 +01002304
Charles Manning753ac612012-05-09 16:55:17 +00002305 memset(dev->block_info, 0, n_blocks * sizeof(struct yaffs_block_info));
2306 memset(dev->chunk_bits, 0, dev->chunk_bit_stride * n_blocks);
2307 return YAFFS_OK;
William Juul0e8cc8b2007-11-15 11:13:05 +01002308
Charles Manning753ac612012-05-09 16:55:17 +00002309alloc_error:
2310 yaffs_deinit_blocks(dev);
2311 return YAFFS_FAIL;
William Juul0e8cc8b2007-11-15 11:13:05 +01002312}
2313
William Juul0e8cc8b2007-11-15 11:13:05 +01002314
Charles Manning753ac612012-05-09 16:55:17 +00002315void yaffs_block_became_dirty(struct yaffs_dev *dev, int block_no)
2316{
2317 struct yaffs_block_info *bi = yaffs_get_block_info(dev, block_no);
2318 int erased_ok = 0;
2319 int i;
William Juul0e8cc8b2007-11-15 11:13:05 +01002320
2321 /* If the block is still healthy erase it and mark as clean.
2322 * If the block has had a data failure, then retire it.
2323 */
Wolfgang Denk4b070802008-08-14 14:41:06 +02002324
Charles Manning753ac612012-05-09 16:55:17 +00002325 yaffs_trace(YAFFS_TRACE_GC | YAFFS_TRACE_ERASE,
2326 "yaffs_block_became_dirty block %d state %d %s",
2327 block_no, bi->block_state,
2328 (bi->needs_retiring) ? "needs retiring" : "");
Wolfgang Denk4b070802008-08-14 14:41:06 +02002329
Charles Manning753ac612012-05-09 16:55:17 +00002330 yaffs2_clear_oldest_dirty_seq(dev, bi);
William Juul0e8cc8b2007-11-15 11:13:05 +01002331
Charles Manning753ac612012-05-09 16:55:17 +00002332 bi->block_state = YAFFS_BLOCK_STATE_DIRTY;
2333
2334 /* If this is the block being garbage collected then stop gc'ing */
2335 if (block_no == dev->gc_block)
2336 dev->gc_block = 0;
2337
2338 /* If this block is currently the best candidate for gc
2339 * then drop as a candidate */
2340 if (block_no == dev->gc_dirtiest) {
2341 dev->gc_dirtiest = 0;
2342 dev->gc_pages_in_use = 0;
2343 }
2344
2345 if (!bi->needs_retiring) {
2346 yaffs2_checkpt_invalidate(dev);
2347 erased_ok = yaffs_erase_block(dev, block_no);
2348 if (!erased_ok) {
2349 dev->n_erase_failures++;
2350 yaffs_trace(YAFFS_TRACE_ERROR | YAFFS_TRACE_BAD_BLOCKS,
2351 "**>> Erasure failed %d", block_no);
William Juul0e8cc8b2007-11-15 11:13:05 +01002352 }
2353 }
2354
Charles Manning753ac612012-05-09 16:55:17 +00002355 /* Verify erasure if needed */
2356 if (erased_ok &&
2357 ((yaffs_trace_mask & YAFFS_TRACE_ERASE) ||
2358 !yaffs_skip_verification(dev))) {
2359 for (i = 0; i < dev->param.chunks_per_block; i++) {
2360 if (!yaffs_check_chunk_erased(dev,
2361 block_no * dev->param.chunks_per_block + i)) {
2362 yaffs_trace(YAFFS_TRACE_ERROR,
2363 ">>Block %d erasure supposedly OK, but chunk %d not erased",
2364 block_no, i);
William Juul0e8cc8b2007-11-15 11:13:05 +01002365 }
2366 }
2367 }
2368
Charles Manning753ac612012-05-09 16:55:17 +00002369 if (!erased_ok) {
2370 /* We lost a block of free space */
2371 dev->n_free_chunks -= dev->param.chunks_per_block;
2372 yaffs_retire_block(dev, block_no);
2373 yaffs_trace(YAFFS_TRACE_ERROR | YAFFS_TRACE_BAD_BLOCKS,
2374 "**>> Block %d retired", block_no);
2375 return;
William Juul0e8cc8b2007-11-15 11:13:05 +01002376 }
Charles Manning753ac612012-05-09 16:55:17 +00002377
2378 /* Clean it up... */
2379 bi->block_state = YAFFS_BLOCK_STATE_EMPTY;
2380 bi->seq_number = 0;
2381 dev->n_erased_blocks++;
2382 bi->pages_in_use = 0;
2383 bi->soft_del_pages = 0;
2384 bi->has_shrink_hdr = 0;
2385 bi->skip_erased_check = 1; /* Clean, so no need to check */
2386 bi->gc_prioritise = 0;
2387 bi->has_summary = 0;
2388
2389 yaffs_clear_chunk_bits(dev, block_no);
2390
2391 yaffs_trace(YAFFS_TRACE_ERASE, "Erased block %d", block_no);
William Juul0e8cc8b2007-11-15 11:13:05 +01002392}
2393
Charles Manning753ac612012-05-09 16:55:17 +00002394static inline int yaffs_gc_process_chunk(struct yaffs_dev *dev,
2395 struct yaffs_block_info *bi,
2396 int old_chunk, u8 *buffer)
William Juul0e8cc8b2007-11-15 11:13:05 +01002397{
Charles Manning753ac612012-05-09 16:55:17 +00002398 int new_chunk;
2399 int mark_flash = 1;
2400 struct yaffs_ext_tags tags;
2401 struct yaffs_obj *object;
2402 int matching_chunk;
2403 int ret_val = YAFFS_OK;
William Juul0e8cc8b2007-11-15 11:13:05 +01002404
Charles Manning753ac612012-05-09 16:55:17 +00002405 memset(&tags, 0, sizeof(tags));
2406 yaffs_rd_chunk_tags_nand(dev, old_chunk,
2407 buffer, &tags);
2408 object = yaffs_find_by_number(dev, tags.obj_id);
William Juul0e8cc8b2007-11-15 11:13:05 +01002409
Charles Manning753ac612012-05-09 16:55:17 +00002410 yaffs_trace(YAFFS_TRACE_GC_DETAIL,
2411 "Collecting chunk in block %d, %d %d %d ",
2412 dev->gc_chunk, tags.obj_id,
2413 tags.chunk_id, tags.n_bytes);
2414
2415 if (object && !yaffs_skip_verification(dev)) {
2416 if (tags.chunk_id == 0)
2417 matching_chunk =
2418 object->hdr_chunk;
2419 else if (object->soft_del)
2420 /* Defeat the test */
2421 matching_chunk = old_chunk;
2422 else
2423 matching_chunk =
2424 yaffs_find_chunk_in_file
2425 (object, tags.chunk_id,
2426 NULL);
2427
2428 if (old_chunk != matching_chunk)
2429 yaffs_trace(YAFFS_TRACE_ERROR,
2430 "gc: page in gc mismatch: %d %d %d %d",
2431 old_chunk,
2432 matching_chunk,
2433 tags.obj_id,
2434 tags.chunk_id);
2435 }
2436
2437 if (!object) {
2438 yaffs_trace(YAFFS_TRACE_ERROR,
2439 "page %d in gc has no object: %d %d %d ",
2440 old_chunk,
2441 tags.obj_id, tags.chunk_id,
2442 tags.n_bytes);
2443 }
2444
2445 if (object &&
2446 object->deleted &&
2447 object->soft_del && tags.chunk_id != 0) {
2448 /* Data chunk in a soft deleted file,
2449 * throw it away.
2450 * It's a soft deleted data chunk,
2451 * No need to copy this, just forget
2452 * about it and fix up the object.
William Juul0e8cc8b2007-11-15 11:13:05 +01002453 */
William Juul0e8cc8b2007-11-15 11:13:05 +01002454
Charles Manning753ac612012-05-09 16:55:17 +00002455 /* Free chunks already includes
2456 * softdeleted chunks, how ever this
2457 * chunk is going to soon be really
2458 * deleted which will increment free
2459 * chunks. We have to decrement free
2460 * chunks so this works out properly.
2461 */
2462 dev->n_free_chunks--;
2463 bi->soft_del_pages--;
Wolfgang Denk4b070802008-08-14 14:41:06 +02002464
Charles Manning753ac612012-05-09 16:55:17 +00002465 object->n_data_chunks--;
2466 if (object->n_data_chunks <= 0) {
2467 /* remeber to clean up obj */
2468 dev->gc_cleanup_list[dev->n_clean_ups] = tags.obj_id;
2469 dev->n_clean_ups++;
2470 }
2471 mark_flash = 0;
2472 } else if (object) {
2473 /* It's either a data chunk in a live
2474 * file or an ObjectHeader, so we're
2475 * interested in it.
2476 * NB Need to keep the ObjectHeaders of
2477 * deleted files until the whole file
2478 * has been deleted off
2479 */
2480 tags.serial_number++;
2481 dev->n_gc_copies++;
William Juul0e8cc8b2007-11-15 11:13:05 +01002482
Charles Manning753ac612012-05-09 16:55:17 +00002483 if (tags.chunk_id == 0) {
2484 /* It is an object Id,
2485 * We need to nuke the
2486 * shrinkheader flags since its
2487 * work is done.
2488 * Also need to clean up
2489 * shadowing.
2490 */
2491 struct yaffs_obj_hdr *oh;
2492 oh = (struct yaffs_obj_hdr *) buffer;
2493
2494 oh->is_shrink = 0;
2495 tags.extra_is_shrink = 0;
2496 oh->shadows_obj = 0;
2497 oh->inband_shadowed_obj_id = 0;
2498 tags.extra_shadows = 0;
2499
2500 /* Update file size */
2501 if (object->variant_type == YAFFS_OBJECT_TYPE_FILE) {
2502 yaffs_oh_size_load(oh,
2503 object->variant.file_variant.file_size);
2504 tags.extra_file_size =
2505 object->variant.file_variant.file_size;
2506 }
2507
2508 yaffs_verify_oh(object, oh, &tags, 1);
2509 new_chunk =
2510 yaffs_write_new_chunk(dev, (u8 *) oh, &tags, 1);
2511 } else {
2512 new_chunk =
2513 yaffs_write_new_chunk(dev, buffer, &tags, 1);
William Juul0e8cc8b2007-11-15 11:13:05 +01002514 }
2515
Charles Manning753ac612012-05-09 16:55:17 +00002516 if (new_chunk < 0) {
2517 ret_val = YAFFS_FAIL;
2518 } else {
William Juul0e8cc8b2007-11-15 11:13:05 +01002519
Charles Manning753ac612012-05-09 16:55:17 +00002520 /* Now fix up the Tnodes etc. */
2521
2522 if (tags.chunk_id == 0) {
2523 /* It's a header */
2524 object->hdr_chunk = new_chunk;
2525 object->serial = tags.serial_number;
2526 } else {
2527 /* It's a data chunk */
2528 yaffs_put_chunk_in_file(object, tags.chunk_id,
2529 new_chunk, 0);
2530 }
William Juul0e8cc8b2007-11-15 11:13:05 +01002531 }
2532 }
Charles Manning753ac612012-05-09 16:55:17 +00002533 if (ret_val == YAFFS_OK)
2534 yaffs_chunk_del(dev, old_chunk, mark_flash, __LINE__);
2535 return ret_val;
William Juul0e8cc8b2007-11-15 11:13:05 +01002536}
2537
Charles Manning753ac612012-05-09 16:55:17 +00002538static int yaffs_gc_block(struct yaffs_dev *dev, int block, int whole_block)
William Juul0e8cc8b2007-11-15 11:13:05 +01002539{
Charles Manning753ac612012-05-09 16:55:17 +00002540 int old_chunk;
2541 int ret_val = YAFFS_OK;
William Juul0e8cc8b2007-11-15 11:13:05 +01002542 int i;
Charles Manning753ac612012-05-09 16:55:17 +00002543 int is_checkpt_block;
2544 int max_copies;
2545 int chunks_before = yaffs_get_erased_chunks(dev);
2546 int chunks_after;
2547 struct yaffs_block_info *bi = yaffs_get_block_info(dev, block);
William Juul0e8cc8b2007-11-15 11:13:05 +01002548
Charles Manning753ac612012-05-09 16:55:17 +00002549 is_checkpt_block = (bi->block_state == YAFFS_BLOCK_STATE_CHECKPOINT);
William Juul0e8cc8b2007-11-15 11:13:05 +01002550
Charles Manning753ac612012-05-09 16:55:17 +00002551 yaffs_trace(YAFFS_TRACE_TRACING,
2552 "Collecting block %d, in use %d, shrink %d, whole_block %d",
2553 block, bi->pages_in_use, bi->has_shrink_hdr,
2554 whole_block);
William Juul0e8cc8b2007-11-15 11:13:05 +01002555
Charles Manning753ac612012-05-09 16:55:17 +00002556 /*yaffs_verify_free_chunks(dev); */
William Juul0e8cc8b2007-11-15 11:13:05 +01002557
Charles Manning753ac612012-05-09 16:55:17 +00002558 if (bi->block_state == YAFFS_BLOCK_STATE_FULL)
2559 bi->block_state = YAFFS_BLOCK_STATE_COLLECTING;
William Juul0e8cc8b2007-11-15 11:13:05 +01002560
Charles Manning753ac612012-05-09 16:55:17 +00002561 bi->has_shrink_hdr = 0; /* clear the flag so that the block can erase */
Wolfgang Denk4b070802008-08-14 14:41:06 +02002562
Charles Manning753ac612012-05-09 16:55:17 +00002563 dev->gc_disable = 1;
William Juul0e8cc8b2007-11-15 11:13:05 +01002564
Charles Manning753ac612012-05-09 16:55:17 +00002565 yaffs_summary_gc(dev, block);
William Juul0e8cc8b2007-11-15 11:13:05 +01002566
Charles Manning753ac612012-05-09 16:55:17 +00002567 if (is_checkpt_block || !yaffs_still_some_chunks(dev, block)) {
2568 yaffs_trace(YAFFS_TRACE_TRACING,
2569 "Collecting block %d that has no chunks in use",
2570 block);
2571 yaffs_block_became_dirty(dev, block);
William Juul0e8cc8b2007-11-15 11:13:05 +01002572 } else {
2573
Charles Manning753ac612012-05-09 16:55:17 +00002574 u8 *buffer = yaffs_get_temp_buffer(dev);
Wolfgang Denk4b070802008-08-14 14:41:06 +02002575
Charles Manning753ac612012-05-09 16:55:17 +00002576 yaffs_verify_blk(dev, bi, block);
William Juul0e8cc8b2007-11-15 11:13:05 +01002577
Charles Manning753ac612012-05-09 16:55:17 +00002578 max_copies = (whole_block) ? dev->param.chunks_per_block : 5;
2579 old_chunk = block * dev->param.chunks_per_block + dev->gc_chunk;
William Juul0e8cc8b2007-11-15 11:13:05 +01002580
Charles Manning753ac612012-05-09 16:55:17 +00002581 for (/* init already done */ ;
2582 ret_val == YAFFS_OK &&
2583 dev->gc_chunk < dev->param.chunks_per_block &&
2584 (bi->block_state == YAFFS_BLOCK_STATE_COLLECTING) &&
2585 max_copies > 0;
2586 dev->gc_chunk++, old_chunk++) {
2587 if (yaffs_check_chunk_bit(dev, block, dev->gc_chunk)) {
2588 /* Page is in use and might need to be copied */
2589 max_copies--;
2590 ret_val = yaffs_gc_process_chunk(dev, bi,
2591 old_chunk, buffer);
William Juul0e8cc8b2007-11-15 11:13:05 +01002592 }
2593 }
Charles Manning753ac612012-05-09 16:55:17 +00002594 yaffs_release_temp_buffer(dev, buffer);
2595 }
William Juul0e8cc8b2007-11-15 11:13:05 +01002596
Charles Manning753ac612012-05-09 16:55:17 +00002597 yaffs_verify_collected_blk(dev, bi, block);
William Juul0e8cc8b2007-11-15 11:13:05 +01002598
Charles Manning753ac612012-05-09 16:55:17 +00002599 if (bi->block_state == YAFFS_BLOCK_STATE_COLLECTING) {
2600 /*
2601 * The gc did not complete. Set block state back to FULL
2602 * because checkpointing does not restore gc.
2603 */
2604 bi->block_state = YAFFS_BLOCK_STATE_FULL;
2605 } else {
2606 /* The gc completed. */
William Juul0e8cc8b2007-11-15 11:13:05 +01002607 /* Do any required cleanups */
Charles Manning753ac612012-05-09 16:55:17 +00002608 for (i = 0; i < dev->n_clean_ups; i++) {
William Juul0e8cc8b2007-11-15 11:13:05 +01002609 /* Time to delete the file too */
Charles Manning753ac612012-05-09 16:55:17 +00002610 struct yaffs_obj *object =
2611 yaffs_find_by_number(dev, dev->gc_cleanup_list[i]);
William Juul0e8cc8b2007-11-15 11:13:05 +01002612 if (object) {
Charles Manning753ac612012-05-09 16:55:17 +00002613 yaffs_free_tnode(dev,
2614 object->variant.file_variant.top);
2615 object->variant.file_variant.top = NULL;
2616 yaffs_trace(YAFFS_TRACE_GC,
2617 "yaffs: About to finally delete object %d",
2618 object->obj_id);
2619 yaffs_generic_obj_del(object);
2620 object->my_dev->n_deleted_files--;
William Juul0e8cc8b2007-11-15 11:13:05 +01002621 }
2622
2623 }
Charles Manning753ac612012-05-09 16:55:17 +00002624 chunks_after = yaffs_get_erased_chunks(dev);
2625 if (chunks_before >= chunks_after)
2626 yaffs_trace(YAFFS_TRACE_GC,
2627 "gc did not increase free chunks before %d after %d",
2628 chunks_before, chunks_after);
2629 dev->gc_block = 0;
2630 dev->gc_chunk = 0;
2631 dev->n_clean_ups = 0;
William Juul0e8cc8b2007-11-15 11:13:05 +01002632 }
2633
Charles Manning753ac612012-05-09 16:55:17 +00002634 dev->gc_disable = 0;
Wolfgang Denk4b070802008-08-14 14:41:06 +02002635
Charles Manning753ac612012-05-09 16:55:17 +00002636 return ret_val;
2637}
2638
2639/*
2640 * find_gc_block() selects the dirtiest block (or close enough)
2641 * for garbage collection.
2642 */
2643
2644static unsigned yaffs_find_gc_block(struct yaffs_dev *dev,
2645 int aggressive, int background)
2646{
2647 int i;
2648 int iterations;
2649 unsigned selected = 0;
2650 int prioritised = 0;
2651 int prioritised_exist = 0;
2652 struct yaffs_block_info *bi;
2653 int threshold;
2654
2655 /* First let's see if we need to grab a prioritised block */
2656 if (dev->has_pending_prioritised_gc && !aggressive) {
2657 dev->gc_dirtiest = 0;
2658 bi = dev->block_info;
2659 for (i = dev->internal_start_block;
2660 i <= dev->internal_end_block && !selected; i++) {
2661
2662 if (bi->gc_prioritise) {
2663 prioritised_exist = 1;
2664 if (bi->block_state == YAFFS_BLOCK_STATE_FULL &&
2665 yaffs_block_ok_for_gc(dev, bi)) {
2666 selected = i;
2667 prioritised = 1;
2668 }
2669 }
2670 bi++;
2671 }
2672
2673 /*
2674 * If there is a prioritised block and none was selected then
2675 * this happened because there is at least one old dirty block
2676 * gumming up the works. Let's gc the oldest dirty block.
2677 */
2678
2679 if (prioritised_exist &&
2680 !selected && dev->oldest_dirty_block > 0)
2681 selected = dev->oldest_dirty_block;
2682
2683 if (!prioritised_exist) /* None found, so we can clear this */
2684 dev->has_pending_prioritised_gc = 0;
William Juul0e8cc8b2007-11-15 11:13:05 +01002685 }
2686
Charles Manning753ac612012-05-09 16:55:17 +00002687 /* If we're doing aggressive GC then we are happy to take a less-dirty
2688 * block, and search harder.
2689 * else (leasurely gc), then we only bother to do this if the
2690 * block has only a few pages in use.
2691 */
William Juul0e8cc8b2007-11-15 11:13:05 +01002692
Charles Manning753ac612012-05-09 16:55:17 +00002693 if (!selected) {
2694 int pages_used;
2695 int n_blocks =
2696 dev->internal_end_block - dev->internal_start_block + 1;
2697 if (aggressive) {
2698 threshold = dev->param.chunks_per_block;
2699 iterations = n_blocks;
2700 } else {
2701 int max_threshold;
2702
2703 if (background)
2704 max_threshold = dev->param.chunks_per_block / 2;
2705 else
2706 max_threshold = dev->param.chunks_per_block / 8;
2707
2708 if (max_threshold < YAFFS_GC_PASSIVE_THRESHOLD)
2709 max_threshold = YAFFS_GC_PASSIVE_THRESHOLD;
2710
2711 threshold = background ? (dev->gc_not_done + 2) * 2 : 0;
2712 if (threshold < YAFFS_GC_PASSIVE_THRESHOLD)
2713 threshold = YAFFS_GC_PASSIVE_THRESHOLD;
2714 if (threshold > max_threshold)
2715 threshold = max_threshold;
2716
2717 iterations = n_blocks / 16 + 1;
2718 if (iterations > 100)
2719 iterations = 100;
2720 }
2721
2722 for (i = 0;
2723 i < iterations &&
2724 (dev->gc_dirtiest < 1 ||
2725 dev->gc_pages_in_use > YAFFS_GC_GOOD_ENOUGH);
2726 i++) {
2727 dev->gc_block_finder++;
2728 if (dev->gc_block_finder < dev->internal_start_block ||
2729 dev->gc_block_finder > dev->internal_end_block)
2730 dev->gc_block_finder =
2731 dev->internal_start_block;
2732
2733 bi = yaffs_get_block_info(dev, dev->gc_block_finder);
2734
2735 pages_used = bi->pages_in_use - bi->soft_del_pages;
2736
2737 if (bi->block_state == YAFFS_BLOCK_STATE_FULL &&
2738 pages_used < dev->param.chunks_per_block &&
2739 (dev->gc_dirtiest < 1 ||
2740 pages_used < dev->gc_pages_in_use) &&
2741 yaffs_block_ok_for_gc(dev, bi)) {
2742 dev->gc_dirtiest = dev->gc_block_finder;
2743 dev->gc_pages_in_use = pages_used;
2744 }
2745 }
2746
2747 if (dev->gc_dirtiest > 0 && dev->gc_pages_in_use <= threshold)
2748 selected = dev->gc_dirtiest;
2749 }
2750
2751 /*
2752 * If nothing has been selected for a while, try the oldest dirty
2753 * because that's gumming up the works.
2754 */
2755
2756 if (!selected && dev->param.is_yaffs2 &&
2757 dev->gc_not_done >= (background ? 10 : 20)) {
2758 yaffs2_find_oldest_dirty_seq(dev);
2759 if (dev->oldest_dirty_block > 0) {
2760 selected = dev->oldest_dirty_block;
2761 dev->gc_dirtiest = selected;
2762 dev->oldest_dirty_gc_count++;
2763 bi = yaffs_get_block_info(dev, selected);
2764 dev->gc_pages_in_use =
2765 bi->pages_in_use - bi->soft_del_pages;
2766 } else {
2767 dev->gc_not_done = 0;
2768 }
2769 }
2770
2771 if (selected) {
2772 yaffs_trace(YAFFS_TRACE_GC,
2773 "GC Selected block %d with %d free, prioritised:%d",
2774 selected,
2775 dev->param.chunks_per_block - dev->gc_pages_in_use,
2776 prioritised);
2777
2778 dev->n_gc_blocks++;
2779 if (background)
2780 dev->bg_gcs++;
2781
2782 dev->gc_dirtiest = 0;
2783 dev->gc_pages_in_use = 0;
2784 dev->gc_not_done = 0;
2785 if (dev->refresh_skip > 0)
2786 dev->refresh_skip--;
2787 } else {
2788 dev->gc_not_done++;
2789 yaffs_trace(YAFFS_TRACE_GC,
2790 "GC none: finder %d skip %d threshold %d dirtiest %d using %d oldest %d%s",
2791 dev->gc_block_finder, dev->gc_not_done, threshold,
2792 dev->gc_dirtiest, dev->gc_pages_in_use,
2793 dev->oldest_dirty_block, background ? " bg" : "");
2794 }
2795
2796 return selected;
William Juul0e8cc8b2007-11-15 11:13:05 +01002797}
2798
2799/* New garbage collector
2800 * If we're very low on erased blocks then we do aggressive garbage collection
2801 * otherwise we do "leasurely" garbage collection.
2802 * Aggressive gc looks further (whole array) and will accept less dirty blocks.
Charles Manning753ac612012-05-09 16:55:17 +00002803 * Passive gc only inspects smaller areas and only accepts more dirty blocks.
William Juul0e8cc8b2007-11-15 11:13:05 +01002804 *
2805 * The idea is to help clear out space in a more spread-out manner.
2806 * Dunno if it really does anything useful.
2807 */
Charles Manning753ac612012-05-09 16:55:17 +00002808static int yaffs_check_gc(struct yaffs_dev *dev, int background)
William Juul0e8cc8b2007-11-15 11:13:05 +01002809{
Charles Manning753ac612012-05-09 16:55:17 +00002810 int aggressive = 0;
2811 int gc_ok = YAFFS_OK;
2812 int max_tries = 0;
2813 int min_erased;
2814 int erased_chunks;
2815 int checkpt_block_adjust;
Wolfgang Denk4b070802008-08-14 14:41:06 +02002816
Charles Manning753ac612012-05-09 16:55:17 +00002817 if (dev->param.gc_control && (dev->param.gc_control(dev) & 1) == 0)
2818 return YAFFS_OK;
William Juul0e8cc8b2007-11-15 11:13:05 +01002819
Charles Manning753ac612012-05-09 16:55:17 +00002820 if (dev->gc_disable)
William Juul0e8cc8b2007-11-15 11:13:05 +01002821 /* Bail out so we don't get recursive gc */
2822 return YAFFS_OK;
Wolfgang Denk4b070802008-08-14 14:41:06 +02002823
William Juul0e8cc8b2007-11-15 11:13:05 +01002824 /* This loop should pass the first time.
Charles Manning753ac612012-05-09 16:55:17 +00002825 * Only loops here if the collection does not increase space.
William Juul0e8cc8b2007-11-15 11:13:05 +01002826 */
2827
2828 do {
Charles Manning753ac612012-05-09 16:55:17 +00002829 max_tries++;
Wolfgang Denk4b070802008-08-14 14:41:06 +02002830
Charles Manning753ac612012-05-09 16:55:17 +00002831 checkpt_block_adjust = yaffs_calc_checkpt_blocks_required(dev);
William Juul0e8cc8b2007-11-15 11:13:05 +01002832
Charles Manning753ac612012-05-09 16:55:17 +00002833 min_erased =
2834 dev->param.n_reserved_blocks + checkpt_block_adjust + 1;
2835 erased_chunks =
2836 dev->n_erased_blocks * dev->param.chunks_per_block;
2837
2838 /* If we need a block soon then do aggressive gc. */
2839 if (dev->n_erased_blocks < min_erased)
William Juul0e8cc8b2007-11-15 11:13:05 +01002840 aggressive = 1;
Charles Manning753ac612012-05-09 16:55:17 +00002841 else {
2842 if (!background
2843 && erased_chunks > (dev->n_free_chunks / 4))
2844 break;
William Juul0e8cc8b2007-11-15 11:13:05 +01002845
Charles Manning753ac612012-05-09 16:55:17 +00002846 if (dev->gc_skip > 20)
2847 dev->gc_skip = 20;
2848 if (erased_chunks < dev->n_free_chunks / 2 ||
2849 dev->gc_skip < 1 || background)
2850 aggressive = 0;
2851 else {
2852 dev->gc_skip--;
2853 break;
William Juul0e8cc8b2007-11-15 11:13:05 +01002854 }
William Juul0e8cc8b2007-11-15 11:13:05 +01002855 }
2856
Charles Manning753ac612012-05-09 16:55:17 +00002857 dev->gc_skip = 5;
William Juul0e8cc8b2007-11-15 11:13:05 +01002858
Charles Manning753ac612012-05-09 16:55:17 +00002859 /* If we don't already have a block being gc'd then see if we
2860 * should start another */
2861
2862 if (dev->gc_block < 1 && !aggressive) {
2863 dev->gc_block = yaffs2_find_refresh_block(dev);
2864 dev->gc_chunk = 0;
2865 dev->n_clean_ups = 0;
2866 }
2867 if (dev->gc_block < 1) {
2868 dev->gc_block =
2869 yaffs_find_gc_block(dev, aggressive, background);
2870 dev->gc_chunk = 0;
2871 dev->n_clean_ups = 0;
2872 }
2873
2874 if (dev->gc_block > 0) {
2875 dev->all_gcs++;
2876 if (!aggressive)
2877 dev->passive_gc_count++;
2878
2879 yaffs_trace(YAFFS_TRACE_GC,
2880 "yaffs: GC n_erased_blocks %d aggressive %d",
2881 dev->n_erased_blocks, aggressive);
2882
2883 gc_ok = yaffs_gc_block(dev, dev->gc_block, aggressive);
2884 }
2885
2886 if (dev->n_erased_blocks < (dev->param.n_reserved_blocks) &&
2887 dev->gc_block > 0) {
2888 yaffs_trace(YAFFS_TRACE_GC,
2889 "yaffs: GC !!!no reclaim!!! n_erased_blocks %d after try %d block %d",
2890 dev->n_erased_blocks, max_tries,
2891 dev->gc_block);
2892 }
2893 } while ((dev->n_erased_blocks < dev->param.n_reserved_blocks) &&
2894 (dev->gc_block > 0) && (max_tries < 2));
2895
2896 return aggressive ? gc_ok : YAFFS_OK;
William Juul0e8cc8b2007-11-15 11:13:05 +01002897}
2898
Charles Manning753ac612012-05-09 16:55:17 +00002899/*
2900 * yaffs_bg_gc()
2901 * Garbage collects. Intended to be called from a background thread.
2902 * Returns non-zero if at least half the free chunks are erased.
2903 */
2904int yaffs_bg_gc(struct yaffs_dev *dev, unsigned urgency)
William Juul0e8cc8b2007-11-15 11:13:05 +01002905{
Charles Manning753ac612012-05-09 16:55:17 +00002906 int erased_chunks = dev->n_erased_blocks * dev->param.chunks_per_block;
William Juul0e8cc8b2007-11-15 11:13:05 +01002907
Charles Manning753ac612012-05-09 16:55:17 +00002908 yaffs_trace(YAFFS_TRACE_BACKGROUND, "Background gc %u", urgency);
2909
2910 yaffs_check_gc(dev, 1);
2911 return erased_chunks > dev->n_free_chunks / 2;
William Juul0e8cc8b2007-11-15 11:13:05 +01002912}
2913
William Juul0e8cc8b2007-11-15 11:13:05 +01002914/*-------------------- Data file manipulation -----------------*/
2915
Charles Manning753ac612012-05-09 16:55:17 +00002916static int yaffs_rd_data_obj(struct yaffs_obj *in, int inode_chunk, u8 * buffer)
William Juul0e8cc8b2007-11-15 11:13:05 +01002917{
Charles Manning753ac612012-05-09 16:55:17 +00002918 int nand_chunk = yaffs_find_chunk_in_file(in, inode_chunk, NULL);
William Juul0e8cc8b2007-11-15 11:13:05 +01002919
Charles Manning753ac612012-05-09 16:55:17 +00002920 if (nand_chunk >= 0)
2921 return yaffs_rd_chunk_tags_nand(in->my_dev, nand_chunk,
2922 buffer, NULL);
2923 else {
2924 yaffs_trace(YAFFS_TRACE_NANDACCESS,
2925 "Chunk %d not found zero instead",
2926 nand_chunk);
William Juul0e8cc8b2007-11-15 11:13:05 +01002927 /* get sane (zero) data if you read a hole */
Charles Manning753ac612012-05-09 16:55:17 +00002928 memset(buffer, 0, in->my_dev->data_bytes_per_chunk);
William Juul0e8cc8b2007-11-15 11:13:05 +01002929 return 0;
2930 }
2931
2932}
2933
Charles Manning753ac612012-05-09 16:55:17 +00002934void yaffs_chunk_del(struct yaffs_dev *dev, int chunk_id, int mark_flash,
2935 int lyn)
William Juul0e8cc8b2007-11-15 11:13:05 +01002936{
2937 int block;
2938 int page;
Charles Manning753ac612012-05-09 16:55:17 +00002939 struct yaffs_ext_tags tags;
2940 struct yaffs_block_info *bi;
William Juul0e8cc8b2007-11-15 11:13:05 +01002941
Charles Manning753ac612012-05-09 16:55:17 +00002942 if (chunk_id <= 0)
William Juul0e8cc8b2007-11-15 11:13:05 +01002943 return;
Wolfgang Denk4b070802008-08-14 14:41:06 +02002944
Charles Manning753ac612012-05-09 16:55:17 +00002945 dev->n_deletions++;
2946 block = chunk_id / dev->param.chunks_per_block;
2947 page = chunk_id % dev->param.chunks_per_block;
William Juul0e8cc8b2007-11-15 11:13:05 +01002948
Charles Manning753ac612012-05-09 16:55:17 +00002949 if (!yaffs_check_chunk_bit(dev, block, page))
2950 yaffs_trace(YAFFS_TRACE_VERIFY,
2951 "Deleting invalid chunk %d", chunk_id);
William Juul0e8cc8b2007-11-15 11:13:05 +01002952
Charles Manning753ac612012-05-09 16:55:17 +00002953 bi = yaffs_get_block_info(dev, block);
William Juul0e8cc8b2007-11-15 11:13:05 +01002954
Charles Manning753ac612012-05-09 16:55:17 +00002955 yaffs2_update_oldest_dirty_seq(dev, block, bi);
William Juul0e8cc8b2007-11-15 11:13:05 +01002956
Charles Manning753ac612012-05-09 16:55:17 +00002957 yaffs_trace(YAFFS_TRACE_DELETION,
2958 "line %d delete of chunk %d",
2959 lyn, chunk_id);
William Juul0e8cc8b2007-11-15 11:13:05 +01002960
Charles Manning753ac612012-05-09 16:55:17 +00002961 if (!dev->param.is_yaffs2 && mark_flash &&
2962 bi->block_state != YAFFS_BLOCK_STATE_COLLECTING) {
William Juul0e8cc8b2007-11-15 11:13:05 +01002963
Charles Manning753ac612012-05-09 16:55:17 +00002964 memset(&tags, 0, sizeof(tags));
2965 tags.is_deleted = 1;
2966 yaffs_wr_chunk_tags_nand(dev, chunk_id, NULL, &tags);
2967 yaffs_handle_chunk_update(dev, chunk_id, &tags);
William Juul0e8cc8b2007-11-15 11:13:05 +01002968 } else {
Charles Manning753ac612012-05-09 16:55:17 +00002969 dev->n_unmarked_deletions++;
William Juul0e8cc8b2007-11-15 11:13:05 +01002970 }
2971
2972 /* Pull out of the management area.
2973 * If the whole block became dirty, this will kick off an erasure.
2974 */
Charles Manning753ac612012-05-09 16:55:17 +00002975 if (bi->block_state == YAFFS_BLOCK_STATE_ALLOCATING ||
2976 bi->block_state == YAFFS_BLOCK_STATE_FULL ||
2977 bi->block_state == YAFFS_BLOCK_STATE_NEEDS_SCAN ||
2978 bi->block_state == YAFFS_BLOCK_STATE_COLLECTING) {
2979 dev->n_free_chunks++;
2980 yaffs_clear_chunk_bit(dev, block, page);
2981 bi->pages_in_use--;
William Juul0e8cc8b2007-11-15 11:13:05 +01002982
Charles Manning753ac612012-05-09 16:55:17 +00002983 if (bi->pages_in_use == 0 &&
2984 !bi->has_shrink_hdr &&
2985 bi->block_state != YAFFS_BLOCK_STATE_ALLOCATING &&
2986 bi->block_state != YAFFS_BLOCK_STATE_NEEDS_SCAN) {
2987 yaffs_block_became_dirty(dev, block);
William Juul0e8cc8b2007-11-15 11:13:05 +01002988 }
William Juul0e8cc8b2007-11-15 11:13:05 +01002989 }
William Juul0e8cc8b2007-11-15 11:13:05 +01002990}
2991
Charles Manning753ac612012-05-09 16:55:17 +00002992static int yaffs_wr_data_obj(struct yaffs_obj *in, int inode_chunk,
2993 const u8 *buffer, int n_bytes, int use_reserve)
William Juul0e8cc8b2007-11-15 11:13:05 +01002994{
2995 /* Find old chunk Need to do this to get serial number
2996 * Write new one and patch into tree.
2997 * Invalidate old tags.
2998 */
2999
Charles Manning753ac612012-05-09 16:55:17 +00003000 int prev_chunk_id;
3001 struct yaffs_ext_tags prev_tags;
3002 int new_chunk_id;
3003 struct yaffs_ext_tags new_tags;
3004 struct yaffs_dev *dev = in->my_dev;
William Juul0e8cc8b2007-11-15 11:13:05 +01003005
Charles Manning753ac612012-05-09 16:55:17 +00003006 yaffs_check_gc(dev, 0);
William Juul0e8cc8b2007-11-15 11:13:05 +01003007
Charles Manning753ac612012-05-09 16:55:17 +00003008 /* Get the previous chunk at this location in the file if it exists.
3009 * If it does not exist then put a zero into the tree. This creates
3010 * the tnode now, rather than later when it is harder to clean up.
3011 */
3012 prev_chunk_id = yaffs_find_chunk_in_file(in, inode_chunk, &prev_tags);
3013 if (prev_chunk_id < 1 &&
3014 !yaffs_put_chunk_in_file(in, inode_chunk, 0, 0))
3015 return 0;
William Juul0e8cc8b2007-11-15 11:13:05 +01003016
3017 /* Set up new tags */
Charles Manning753ac612012-05-09 16:55:17 +00003018 memset(&new_tags, 0, sizeof(new_tags));
William Juul0e8cc8b2007-11-15 11:13:05 +01003019
Charles Manning753ac612012-05-09 16:55:17 +00003020 new_tags.chunk_id = inode_chunk;
3021 new_tags.obj_id = in->obj_id;
3022 new_tags.serial_number =
3023 (prev_chunk_id > 0) ? prev_tags.serial_number + 1 : 1;
3024 new_tags.n_bytes = n_bytes;
William Juul0e8cc8b2007-11-15 11:13:05 +01003025
Charles Manning753ac612012-05-09 16:55:17 +00003026 if (n_bytes < 1 || n_bytes > dev->param.total_bytes_per_chunk) {
3027 yaffs_trace(YAFFS_TRACE_ERROR,
3028 "Writing %d bytes to chunk!!!!!!!!!",
3029 n_bytes);
3030 BUG();
3031 }
William Juul0e8cc8b2007-11-15 11:13:05 +01003032
Charles Manning753ac612012-05-09 16:55:17 +00003033 new_chunk_id =
3034 yaffs_write_new_chunk(dev, buffer, &new_tags, use_reserve);
William Juul0e8cc8b2007-11-15 11:13:05 +01003035
Charles Manning753ac612012-05-09 16:55:17 +00003036 if (new_chunk_id > 0) {
3037 yaffs_put_chunk_in_file(in, inode_chunk, new_chunk_id, 0);
William Juul0e8cc8b2007-11-15 11:13:05 +01003038
Charles Manning753ac612012-05-09 16:55:17 +00003039 if (prev_chunk_id > 0)
3040 yaffs_chunk_del(dev, prev_chunk_id, 1, __LINE__);
3041
3042 yaffs_verify_file_sane(in);
3043 }
3044 return new_chunk_id;
3045
3046}
3047
3048
3049
3050static int yaffs_do_xattrib_mod(struct yaffs_obj *obj, int set,
3051 const YCHAR *name, const void *value, int size,
3052 int flags)
3053{
3054 struct yaffs_xattr_mod xmod;
3055 int result;
3056
3057 xmod.set = set;
3058 xmod.name = name;
3059 xmod.data = value;
3060 xmod.size = size;
3061 xmod.flags = flags;
3062 xmod.result = -ENOSPC;
3063
3064 result = yaffs_update_oh(obj, NULL, 0, 0, 0, &xmod);
3065
3066 if (result > 0)
3067 return xmod.result;
3068 else
3069 return -ENOSPC;
3070}
3071
3072static int yaffs_apply_xattrib_mod(struct yaffs_obj *obj, char *buffer,
3073 struct yaffs_xattr_mod *xmod)
3074{
3075 int retval = 0;
3076 int x_offs = sizeof(struct yaffs_obj_hdr);
3077 struct yaffs_dev *dev = obj->my_dev;
3078 int x_size = dev->data_bytes_per_chunk - sizeof(struct yaffs_obj_hdr);
3079 char *x_buffer = buffer + x_offs;
3080
3081 if (xmod->set)
3082 retval =
3083 nval_set(x_buffer, x_size, xmod->name, xmod->data,
3084 xmod->size, xmod->flags);
3085 else
3086 retval = nval_del(x_buffer, x_size, xmod->name);
3087
3088 obj->has_xattr = nval_hasvalues(x_buffer, x_size);
3089 obj->xattr_known = 1;
3090 xmod->result = retval;
3091
3092 return retval;
3093}
3094
3095static int yaffs_do_xattrib_fetch(struct yaffs_obj *obj, const YCHAR *name,
3096 void *value, int size)
3097{
3098 char *buffer = NULL;
3099 int result;
3100 struct yaffs_ext_tags tags;
3101 struct yaffs_dev *dev = obj->my_dev;
3102 int x_offs = sizeof(struct yaffs_obj_hdr);
3103 int x_size = dev->data_bytes_per_chunk - sizeof(struct yaffs_obj_hdr);
3104 char *x_buffer;
3105 int retval = 0;
3106
3107 if (obj->hdr_chunk < 1)
3108 return -ENODATA;
3109
3110 /* If we know that the object has no xattribs then don't do all the
3111 * reading and parsing.
3112 */
3113 if (obj->xattr_known && !obj->has_xattr) {
3114 if (name)
3115 return -ENODATA;
3116 else
3117 return 0;
3118 }
3119
3120 buffer = (char *)yaffs_get_temp_buffer(dev);
3121 if (!buffer)
3122 return -ENOMEM;
3123
3124 result =
3125 yaffs_rd_chunk_tags_nand(dev, obj->hdr_chunk, (u8 *) buffer, &tags);
3126
3127 if (result != YAFFS_OK)
3128 retval = -ENOENT;
3129 else {
3130 x_buffer = buffer + x_offs;
3131
3132 if (!obj->xattr_known) {
3133 obj->has_xattr = nval_hasvalues(x_buffer, x_size);
3134 obj->xattr_known = 1;
William Juul0e8cc8b2007-11-15 11:13:05 +01003135 }
3136
Charles Manning753ac612012-05-09 16:55:17 +00003137 if (name)
3138 retval = nval_get(x_buffer, x_size, name, value, size);
3139 else
3140 retval = nval_list(x_buffer, x_size, value, size);
William Juul0e8cc8b2007-11-15 11:13:05 +01003141 }
Charles Manning753ac612012-05-09 16:55:17 +00003142 yaffs_release_temp_buffer(dev, (u8 *) buffer);
3143 return retval;
3144}
William Juul0e8cc8b2007-11-15 11:13:05 +01003145
Charles Manning753ac612012-05-09 16:55:17 +00003146int yaffs_set_xattrib(struct yaffs_obj *obj, const YCHAR * name,
3147 const void *value, int size, int flags)
3148{
3149 return yaffs_do_xattrib_mod(obj, 1, name, value, size, flags);
3150}
3151
3152int yaffs_remove_xattrib(struct yaffs_obj *obj, const YCHAR * name)
3153{
3154 return yaffs_do_xattrib_mod(obj, 0, name, NULL, 0, 0);
3155}
3156
3157int yaffs_get_xattrib(struct yaffs_obj *obj, const YCHAR * name, void *value,
3158 int size)
3159{
3160 return yaffs_do_xattrib_fetch(obj, name, value, size);
3161}
3162
3163int yaffs_list_xattrib(struct yaffs_obj *obj, char *buffer, int size)
3164{
3165 return yaffs_do_xattrib_fetch(obj, NULL, buffer, size);
3166}
3167
3168static void yaffs_check_obj_details_loaded(struct yaffs_obj *in)
3169{
3170 u8 *buf;
3171 struct yaffs_obj_hdr *oh;
3172 struct yaffs_dev *dev;
3173 struct yaffs_ext_tags tags;
Charles Manning753ac612012-05-09 16:55:17 +00003174
3175 if (!in || !in->lazy_loaded || in->hdr_chunk < 1)
3176 return;
3177
3178 dev = in->my_dev;
3179 in->lazy_loaded = 0;
3180 buf = yaffs_get_temp_buffer(dev);
3181
Anatolij Gustschin8cc64ba2012-10-05 23:31:03 +00003182 yaffs_rd_chunk_tags_nand(dev, in->hdr_chunk, buf, &tags);
Charles Manning753ac612012-05-09 16:55:17 +00003183 oh = (struct yaffs_obj_hdr *)buf;
3184
3185 in->yst_mode = oh->yst_mode;
3186 yaffs_load_attribs(in, oh);
3187 yaffs_set_obj_name_from_oh(in, oh);
3188
3189 if (in->variant_type == YAFFS_OBJECT_TYPE_SYMLINK) {
3190 in->variant.symlink_variant.alias =
3191 yaffs_clone_str(oh->alias);
Charles Manning753ac612012-05-09 16:55:17 +00003192 }
3193 yaffs_release_temp_buffer(dev, buf);
3194}
3195
3196static void yaffs_load_name_from_oh(struct yaffs_dev *dev, YCHAR *name,
3197 const YCHAR *oh_name, int buff_size)
3198{
3199#ifdef CONFIG_YAFFS_AUTO_UNICODE
3200 if (dev->param.auto_unicode) {
3201 if (*oh_name) {
3202 /* It is an ASCII name, do an ASCII to
3203 * unicode conversion */
3204 const char *ascii_oh_name = (const char *)oh_name;
3205 int n = buff_size - 1;
3206 while (n > 0 && *ascii_oh_name) {
3207 *name = *ascii_oh_name;
3208 name++;
3209 ascii_oh_name++;
3210 n--;
3211 }
3212 } else {
3213 yaffs_strncpy(name, oh_name + 1, buff_size - 1);
3214 }
3215 } else {
3216#else
3217 dev = dev;
3218 {
3219#endif
3220 yaffs_strncpy(name, oh_name, buff_size - 1);
3221 }
3222}
3223
3224static void yaffs_load_oh_from_name(struct yaffs_dev *dev, YCHAR *oh_name,
3225 const YCHAR *name)
3226{
3227#ifdef CONFIG_YAFFS_AUTO_UNICODE
3228
3229 int is_ascii;
3230 YCHAR *w;
3231
3232 if (dev->param.auto_unicode) {
3233
3234 is_ascii = 1;
3235 w = name;
3236
3237 /* Figure out if the name will fit in ascii character set */
3238 while (is_ascii && *w) {
3239 if ((*w) & 0xff00)
3240 is_ascii = 0;
3241 w++;
3242 }
3243
3244 if (is_ascii) {
3245 /* It is an ASCII name, so convert unicode to ascii */
3246 char *ascii_oh_name = (char *)oh_name;
3247 int n = YAFFS_MAX_NAME_LENGTH - 1;
3248 while (n > 0 && *name) {
3249 *ascii_oh_name = *name;
3250 name++;
3251 ascii_oh_name++;
3252 n--;
3253 }
3254 } else {
3255 /* Unicode name, so save starting at the second YCHAR */
3256 *oh_name = 0;
3257 yaffs_strncpy(oh_name + 1, name, YAFFS_MAX_NAME_LENGTH - 2);
3258 }
3259 } else {
3260#else
3261 dev = dev;
3262 {
3263#endif
3264 yaffs_strncpy(oh_name, name, YAFFS_MAX_NAME_LENGTH - 1);
3265 }
William Juul0e8cc8b2007-11-15 11:13:05 +01003266}
3267
3268/* UpdateObjectHeader updates the header on NAND for an object.
3269 * If name is not NULL, then that new name is used.
3270 */
Charles Manning753ac612012-05-09 16:55:17 +00003271int yaffs_update_oh(struct yaffs_obj *in, const YCHAR *name, int force,
3272 int is_shrink, int shadows, struct yaffs_xattr_mod *xmod)
William Juul0e8cc8b2007-11-15 11:13:05 +01003273{
3274
Charles Manning753ac612012-05-09 16:55:17 +00003275 struct yaffs_block_info *bi;
3276 struct yaffs_dev *dev = in->my_dev;
3277 int prev_chunk_id;
3278 int ret_val = 0;
Charles Manning753ac612012-05-09 16:55:17 +00003279 int new_chunk_id;
3280 struct yaffs_ext_tags new_tags;
3281 struct yaffs_ext_tags old_tags;
3282 const YCHAR *alias = NULL;
3283 u8 *buffer = NULL;
3284 YCHAR old_name[YAFFS_MAX_NAME_LENGTH + 1];
3285 struct yaffs_obj_hdr *oh = NULL;
3286 loff_t file_size = 0;
William Juul0e8cc8b2007-11-15 11:13:05 +01003287
Charles Manning753ac612012-05-09 16:55:17 +00003288 yaffs_strcpy(old_name, _Y("silly old name"));
William Juul0e8cc8b2007-11-15 11:13:05 +01003289
Charles Manning753ac612012-05-09 16:55:17 +00003290 if (in->fake && in != dev->root_dir && !force && !xmod)
3291 return ret_val;
William Juul0e8cc8b2007-11-15 11:13:05 +01003292
Charles Manning753ac612012-05-09 16:55:17 +00003293 yaffs_check_gc(dev, 0);
3294 yaffs_check_obj_details_loaded(in);
William Juul0e8cc8b2007-11-15 11:13:05 +01003295
Charles Manning753ac612012-05-09 16:55:17 +00003296 buffer = yaffs_get_temp_buffer(in->my_dev);
3297 oh = (struct yaffs_obj_hdr *)buffer;
William Juul0e8cc8b2007-11-15 11:13:05 +01003298
Charles Manning753ac612012-05-09 16:55:17 +00003299 prev_chunk_id = in->hdr_chunk;
Wolfgang Denk4b070802008-08-14 14:41:06 +02003300
Charles Manning753ac612012-05-09 16:55:17 +00003301 if (prev_chunk_id > 0) {
Anatolij Gustschin8cc64ba2012-10-05 23:31:03 +00003302 yaffs_rd_chunk_tags_nand(dev, prev_chunk_id,
3303 buffer, &old_tags);
William Juul0e8cc8b2007-11-15 11:13:05 +01003304
Charles Manning753ac612012-05-09 16:55:17 +00003305 yaffs_verify_oh(in, oh, &old_tags, 0);
3306 memcpy(old_name, oh->name, sizeof(oh->name));
3307 memset(buffer, 0xff, sizeof(struct yaffs_obj_hdr));
3308 } else {
3309 memset(buffer, 0xff, dev->data_bytes_per_chunk);
William Juul0e8cc8b2007-11-15 11:13:05 +01003310 }
3311
Charles Manning753ac612012-05-09 16:55:17 +00003312 oh->type = in->variant_type;
3313 oh->yst_mode = in->yst_mode;
3314 oh->shadows_obj = oh->inband_shadowed_obj_id = shadows;
3315
3316 yaffs_load_attribs_oh(oh, in);
3317
3318 if (in->parent)
3319 oh->parent_obj_id = in->parent->obj_id;
3320 else
3321 oh->parent_obj_id = 0;
3322
3323 if (name && *name) {
3324 memset(oh->name, 0, sizeof(oh->name));
3325 yaffs_load_oh_from_name(dev, oh->name, name);
3326 } else if (prev_chunk_id > 0) {
3327 memcpy(oh->name, old_name, sizeof(oh->name));
3328 } else {
3329 memset(oh->name, 0, sizeof(oh->name));
3330 }
3331
3332 oh->is_shrink = is_shrink;
3333
3334 switch (in->variant_type) {
3335 case YAFFS_OBJECT_TYPE_UNKNOWN:
3336 /* Should not happen */
3337 break;
3338 case YAFFS_OBJECT_TYPE_FILE:
3339 if (oh->parent_obj_id != YAFFS_OBJECTID_DELETED &&
3340 oh->parent_obj_id != YAFFS_OBJECTID_UNLINKED)
3341 file_size = in->variant.file_variant.file_size;
3342 yaffs_oh_size_load(oh, file_size);
3343 break;
3344 case YAFFS_OBJECT_TYPE_HARDLINK:
3345 oh->equiv_id = in->variant.hardlink_variant.equiv_id;
3346 break;
3347 case YAFFS_OBJECT_TYPE_SPECIAL:
3348 /* Do nothing */
3349 break;
3350 case YAFFS_OBJECT_TYPE_DIRECTORY:
3351 /* Do nothing */
3352 break;
3353 case YAFFS_OBJECT_TYPE_SYMLINK:
3354 alias = in->variant.symlink_variant.alias;
3355 if (!alias)
3356 alias = _Y("no alias");
3357 yaffs_strncpy(oh->alias, alias, YAFFS_MAX_ALIAS_LENGTH);
3358 oh->alias[YAFFS_MAX_ALIAS_LENGTH] = 0;
3359 break;
3360 }
3361
3362 /* process any xattrib modifications */
3363 if (xmod)
3364 yaffs_apply_xattrib_mod(in, (char *)buffer, xmod);
3365
3366 /* Tags */
3367 memset(&new_tags, 0, sizeof(new_tags));
3368 in->serial++;
3369 new_tags.chunk_id = 0;
3370 new_tags.obj_id = in->obj_id;
3371 new_tags.serial_number = in->serial;
3372
3373 /* Add extra info for file header */
3374 new_tags.extra_available = 1;
3375 new_tags.extra_parent_id = oh->parent_obj_id;
3376 new_tags.extra_file_size = file_size;
3377 new_tags.extra_is_shrink = oh->is_shrink;
3378 new_tags.extra_equiv_id = oh->equiv_id;
3379 new_tags.extra_shadows = (oh->shadows_obj > 0) ? 1 : 0;
3380 new_tags.extra_obj_type = in->variant_type;
3381 yaffs_verify_oh(in, oh, &new_tags, 1);
3382
3383 /* Create new chunk in NAND */
3384 new_chunk_id =
3385 yaffs_write_new_chunk(dev, buffer, &new_tags,
3386 (prev_chunk_id > 0) ? 1 : 0);
3387
William Juul0e8cc8b2007-11-15 11:13:05 +01003388 if (buffer)
Charles Manning753ac612012-05-09 16:55:17 +00003389 yaffs_release_temp_buffer(dev, buffer);
William Juul0e8cc8b2007-11-15 11:13:05 +01003390
Charles Manning753ac612012-05-09 16:55:17 +00003391 if (new_chunk_id < 0)
3392 return new_chunk_id;
William Juul0e8cc8b2007-11-15 11:13:05 +01003393
Charles Manning753ac612012-05-09 16:55:17 +00003394 in->hdr_chunk = new_chunk_id;
William Juul0e8cc8b2007-11-15 11:13:05 +01003395
Charles Manning753ac612012-05-09 16:55:17 +00003396 if (prev_chunk_id > 0)
3397 yaffs_chunk_del(dev, prev_chunk_id, 1, __LINE__);
Wolfgang Denk4b070802008-08-14 14:41:06 +02003398
Charles Manning753ac612012-05-09 16:55:17 +00003399 if (!yaffs_obj_cache_dirty(in))
3400 in->dirty = 0;
Wolfgang Denk4b070802008-08-14 14:41:06 +02003401
Charles Manning753ac612012-05-09 16:55:17 +00003402 /* If this was a shrink, then mark the block
3403 * that the chunk lives on */
3404 if (is_shrink) {
3405 bi = yaffs_get_block_info(in->my_dev,
3406 new_chunk_id /
3407 in->my_dev->param.chunks_per_block);
3408 bi->has_shrink_hdr = 1;
William Juul0e8cc8b2007-11-15 11:13:05 +01003409 }
Wolfgang Denk4b070802008-08-14 14:41:06 +02003410
3411
Charles Manning753ac612012-05-09 16:55:17 +00003412 return new_chunk_id;
William Juul0e8cc8b2007-11-15 11:13:05 +01003413}
3414
3415/*--------------------- File read/write ------------------------
3416 * Read and write have very similar structures.
3417 * In general the read/write has three parts to it
3418 * An incomplete chunk to start with (if the read/write is not chunk-aligned)
3419 * Some complete chunks
3420 * An incomplete chunk to end off with
3421 *
3422 * Curve-balls: the first chunk might also be the last chunk.
3423 */
3424
Charles Manning753ac612012-05-09 16:55:17 +00003425int yaffs_file_rd(struct yaffs_obj *in, u8 * buffer, loff_t offset, int n_bytes)
William Juul0e8cc8b2007-11-15 11:13:05 +01003426{
Charles Manning753ac612012-05-09 16:55:17 +00003427 int chunk;
3428 u32 start;
3429 int n_copy;
3430 int n = n_bytes;
3431 int n_done = 0;
3432 struct yaffs_cache *cache;
3433 struct yaffs_dev *dev;
William Juul0e8cc8b2007-11-15 11:13:05 +01003434
Charles Manning753ac612012-05-09 16:55:17 +00003435 dev = in->my_dev;
William Juul0e8cc8b2007-11-15 11:13:05 +01003436
3437 while (n > 0) {
Charles Manning753ac612012-05-09 16:55:17 +00003438 yaffs_addr_to_chunk(dev, offset, &chunk, &start);
William Juul0e8cc8b2007-11-15 11:13:05 +01003439 chunk++;
3440
3441 /* OK now check for the curveball where the start and end are in
Wolfgang Denk4b070802008-08-14 14:41:06 +02003442 * the same chunk.
William Juul0e8cc8b2007-11-15 11:13:05 +01003443 */
Charles Manning753ac612012-05-09 16:55:17 +00003444 if ((start + n) < dev->data_bytes_per_chunk)
3445 n_copy = n;
3446 else
3447 n_copy = dev->data_bytes_per_chunk - start;
William Juul0e8cc8b2007-11-15 11:13:05 +01003448
Charles Manning753ac612012-05-09 16:55:17 +00003449 cache = yaffs_find_chunk_cache(in, chunk);
William Juul0e8cc8b2007-11-15 11:13:05 +01003450
Charles Manning753ac612012-05-09 16:55:17 +00003451 /* If the chunk is already in the cache or it is less than
3452 * a whole chunk or we're using inband tags then use the cache
3453 * (if there is caching) else bypass the cache.
William Juul0e8cc8b2007-11-15 11:13:05 +01003454 */
Charles Manning753ac612012-05-09 16:55:17 +00003455 if (cache || n_copy != dev->data_bytes_per_chunk ||
3456 dev->param.inband_tags) {
3457 if (dev->param.n_caches > 0) {
William Juul0e8cc8b2007-11-15 11:13:05 +01003458
Charles Manning753ac612012-05-09 16:55:17 +00003459 /* If we can't find the data in the cache,
3460 * then load it up. */
William Juul0e8cc8b2007-11-15 11:13:05 +01003461
3462 if (!cache) {
Charles Manning753ac612012-05-09 16:55:17 +00003463 cache =
3464 yaffs_grab_chunk_cache(in->my_dev);
William Juul0e8cc8b2007-11-15 11:13:05 +01003465 cache->object = in;
Charles Manning753ac612012-05-09 16:55:17 +00003466 cache->chunk_id = chunk;
William Juul0e8cc8b2007-11-15 11:13:05 +01003467 cache->dirty = 0;
3468 cache->locked = 0;
Charles Manning753ac612012-05-09 16:55:17 +00003469 yaffs_rd_data_obj(in, chunk,
3470 cache->data);
3471 cache->n_bytes = 0;
William Juul0e8cc8b2007-11-15 11:13:05 +01003472 }
3473
Charles Manning753ac612012-05-09 16:55:17 +00003474 yaffs_use_cache(dev, cache, 0);
William Juul0e8cc8b2007-11-15 11:13:05 +01003475
3476 cache->locked = 1;
3477
Charles Manning753ac612012-05-09 16:55:17 +00003478 memcpy(buffer, &cache->data[start], n_copy);
William Juul0e8cc8b2007-11-15 11:13:05 +01003479
William Juul0e8cc8b2007-11-15 11:13:05 +01003480 cache->locked = 0;
3481 } else {
Charles Manning753ac612012-05-09 16:55:17 +00003482 /* Read into the local buffer then copy.. */
William Juul0e8cc8b2007-11-15 11:13:05 +01003483
Charles Manning753ac612012-05-09 16:55:17 +00003484 u8 *local_buffer =
3485 yaffs_get_temp_buffer(dev);
3486 yaffs_rd_data_obj(in, chunk, local_buffer);
William Juul0e8cc8b2007-11-15 11:13:05 +01003487
Charles Manning753ac612012-05-09 16:55:17 +00003488 memcpy(buffer, &local_buffer[start], n_copy);
3489
3490 yaffs_release_temp_buffer(dev, local_buffer);
William Juul0e8cc8b2007-11-15 11:13:05 +01003491 }
William Juul0e8cc8b2007-11-15 11:13:05 +01003492 } else {
Charles Manning753ac612012-05-09 16:55:17 +00003493 /* A full chunk. Read directly into the buffer. */
3494 yaffs_rd_data_obj(in, chunk, buffer);
William Juul0e8cc8b2007-11-15 11:13:05 +01003495 }
Charles Manning753ac612012-05-09 16:55:17 +00003496 n -= n_copy;
3497 offset += n_copy;
3498 buffer += n_copy;
3499 n_done += n_copy;
William Juul0e8cc8b2007-11-15 11:13:05 +01003500 }
Charles Manning753ac612012-05-09 16:55:17 +00003501 return n_done;
William Juul0e8cc8b2007-11-15 11:13:05 +01003502}
3503
Charles Manning753ac612012-05-09 16:55:17 +00003504int yaffs_do_file_wr(struct yaffs_obj *in, const u8 *buffer, loff_t offset,
3505 int n_bytes, int write_through)
William Juul0e8cc8b2007-11-15 11:13:05 +01003506{
3507
Charles Manning753ac612012-05-09 16:55:17 +00003508 int chunk;
3509 u32 start;
3510 int n_copy;
3511 int n = n_bytes;
3512 int n_done = 0;
3513 int n_writeback;
3514 loff_t start_write = offset;
3515 int chunk_written = 0;
3516 u32 n_bytes_read;
3517 loff_t chunk_start;
3518 struct yaffs_dev *dev;
William Juul0e8cc8b2007-11-15 11:13:05 +01003519
Charles Manning753ac612012-05-09 16:55:17 +00003520 dev = in->my_dev;
William Juul0e8cc8b2007-11-15 11:13:05 +01003521
Charles Manning753ac612012-05-09 16:55:17 +00003522 while (n > 0 && chunk_written >= 0) {
3523 yaffs_addr_to_chunk(dev, offset, &chunk, &start);
William Juul0e8cc8b2007-11-15 11:13:05 +01003524
Charles Manning753ac612012-05-09 16:55:17 +00003525 if (((loff_t)chunk) *
3526 dev->data_bytes_per_chunk + start != offset ||
3527 start >= dev->data_bytes_per_chunk) {
3528 yaffs_trace(YAFFS_TRACE_ERROR,
3529 "AddrToChunk of offset %lld gives chunk %d start %d",
3530 offset, chunk, start);
3531 }
3532 chunk++; /* File pos to chunk in file offset */
William Juul0e8cc8b2007-11-15 11:13:05 +01003533
3534 /* OK now check for the curveball where the start and end are in
3535 * the same chunk.
3536 */
3537
Charles Manning753ac612012-05-09 16:55:17 +00003538 if ((start + n) < dev->data_bytes_per_chunk) {
3539 n_copy = n;
William Juul0e8cc8b2007-11-15 11:13:05 +01003540
Charles Manning753ac612012-05-09 16:55:17 +00003541 /* Now calculate how many bytes to write back....
3542 * If we're overwriting and not writing to then end of
3543 * file then we need to write back as much as was there
3544 * before.
William Juul0e8cc8b2007-11-15 11:13:05 +01003545 */
3546
Charles Manning753ac612012-05-09 16:55:17 +00003547 chunk_start = (((loff_t)(chunk - 1)) *
3548 dev->data_bytes_per_chunk);
William Juul0e8cc8b2007-11-15 11:13:05 +01003549
Charles Manning753ac612012-05-09 16:55:17 +00003550 if (chunk_start > in->variant.file_variant.file_size)
3551 n_bytes_read = 0; /* Past end of file */
3552 else
3553 n_bytes_read =
3554 in->variant.file_variant.file_size -
3555 chunk_start;
William Juul0e8cc8b2007-11-15 11:13:05 +01003556
Charles Manning753ac612012-05-09 16:55:17 +00003557 if (n_bytes_read > dev->data_bytes_per_chunk)
3558 n_bytes_read = dev->data_bytes_per_chunk;
3559
3560 n_writeback =
3561 (n_bytes_read >
3562 (start + n)) ? n_bytes_read : (start + n);
3563
3564 if (n_writeback < 0 ||
3565 n_writeback > dev->data_bytes_per_chunk)
3566 BUG();
William Juul0e8cc8b2007-11-15 11:13:05 +01003567
3568 } else {
Charles Manning753ac612012-05-09 16:55:17 +00003569 n_copy = dev->data_bytes_per_chunk - start;
3570 n_writeback = dev->data_bytes_per_chunk;
William Juul0e8cc8b2007-11-15 11:13:05 +01003571 }
3572
Charles Manning753ac612012-05-09 16:55:17 +00003573 if (n_copy != dev->data_bytes_per_chunk ||
3574 dev->param.inband_tags) {
3575 /* An incomplete start or end chunk (or maybe both
3576 * start and end chunk), or we're using inband tags,
3577 * so we want to use the cache buffers.
3578 */
3579 if (dev->param.n_caches > 0) {
3580 struct yaffs_cache *cache;
Wolfgang Denk4b070802008-08-14 14:41:06 +02003581
Charles Manning753ac612012-05-09 16:55:17 +00003582 /* If we can't find the data in the cache, then
3583 * load the cache */
3584 cache = yaffs_find_chunk_cache(in, chunk);
3585
3586 if (!cache &&
3587 yaffs_check_alloc_available(dev, 1)) {
3588 cache = yaffs_grab_chunk_cache(dev);
William Juul0e8cc8b2007-11-15 11:13:05 +01003589 cache->object = in;
Charles Manning753ac612012-05-09 16:55:17 +00003590 cache->chunk_id = chunk;
William Juul0e8cc8b2007-11-15 11:13:05 +01003591 cache->dirty = 0;
3592 cache->locked = 0;
Charles Manning753ac612012-05-09 16:55:17 +00003593 yaffs_rd_data_obj(in, chunk,
3594 cache->data);
3595 } else if (cache &&
3596 !cache->dirty &&
3597 !yaffs_check_alloc_available(dev,
3598 1)) {
3599 /* Drop the cache if it was a read cache
3600 * item and no space check has been made
3601 * for it.
Wolfgang Denk4b070802008-08-14 14:41:06 +02003602 */
Charles Manning753ac612012-05-09 16:55:17 +00003603 cache = NULL;
William Juul0e8cc8b2007-11-15 11:13:05 +01003604 }
3605
3606 if (cache) {
Charles Manning753ac612012-05-09 16:55:17 +00003607 yaffs_use_cache(dev, cache, 1);
William Juul0e8cc8b2007-11-15 11:13:05 +01003608 cache->locked = 1;
William Juul0e8cc8b2007-11-15 11:13:05 +01003609
3610 memcpy(&cache->data[start], buffer,
Charles Manning753ac612012-05-09 16:55:17 +00003611 n_copy);
William Juul0e8cc8b2007-11-15 11:13:05 +01003612
William Juul0e8cc8b2007-11-15 11:13:05 +01003613 cache->locked = 0;
Charles Manning753ac612012-05-09 16:55:17 +00003614 cache->n_bytes = n_writeback;
William Juul0e8cc8b2007-11-15 11:13:05 +01003615
Charles Manning753ac612012-05-09 16:55:17 +00003616 if (write_through) {
3617 chunk_written =
3618 yaffs_wr_data_obj
William Juul0e8cc8b2007-11-15 11:13:05 +01003619 (cache->object,
Charles Manning753ac612012-05-09 16:55:17 +00003620 cache->chunk_id,
3621 cache->data,
3622 cache->n_bytes, 1);
William Juul0e8cc8b2007-11-15 11:13:05 +01003623 cache->dirty = 0;
3624 }
William Juul0e8cc8b2007-11-15 11:13:05 +01003625 } else {
Charles Manning753ac612012-05-09 16:55:17 +00003626 chunk_written = -1; /* fail write */
William Juul0e8cc8b2007-11-15 11:13:05 +01003627 }
3628 } else {
Charles Manning753ac612012-05-09 16:55:17 +00003629 /* An incomplete start or end chunk (or maybe
3630 * both start and end chunk). Read into the
3631 * local buffer then copy over and write back.
William Juul0e8cc8b2007-11-15 11:13:05 +01003632 */
3633
Charles Manning753ac612012-05-09 16:55:17 +00003634 u8 *local_buffer = yaffs_get_temp_buffer(dev);
William Juul0e8cc8b2007-11-15 11:13:05 +01003635
Charles Manning753ac612012-05-09 16:55:17 +00003636 yaffs_rd_data_obj(in, chunk, local_buffer);
3637 memcpy(&local_buffer[start], buffer, n_copy);
William Juul0e8cc8b2007-11-15 11:13:05 +01003638
Charles Manning753ac612012-05-09 16:55:17 +00003639 chunk_written =
3640 yaffs_wr_data_obj(in, chunk,
3641 local_buffer,
3642 n_writeback, 0);
William Juul0e8cc8b2007-11-15 11:13:05 +01003643
Charles Manning753ac612012-05-09 16:55:17 +00003644 yaffs_release_temp_buffer(dev, local_buffer);
William Juul0e8cc8b2007-11-15 11:13:05 +01003645 }
William Juul0e8cc8b2007-11-15 11:13:05 +01003646 } else {
Charles Manning753ac612012-05-09 16:55:17 +00003647 /* A full chunk. Write directly from the buffer. */
William Juul0e8cc8b2007-11-15 11:13:05 +01003648
Charles Manning753ac612012-05-09 16:55:17 +00003649 chunk_written =
3650 yaffs_wr_data_obj(in, chunk, buffer,
3651 dev->data_bytes_per_chunk, 0);
3652
3653 /* Since we've overwritten the cached data,
3654 * we better invalidate it. */
3655 yaffs_invalidate_chunk_cache(in, chunk);
William Juul0e8cc8b2007-11-15 11:13:05 +01003656 }
3657
Charles Manning753ac612012-05-09 16:55:17 +00003658 if (chunk_written >= 0) {
3659 n -= n_copy;
3660 offset += n_copy;
3661 buffer += n_copy;
3662 n_done += n_copy;
William Juul0e8cc8b2007-11-15 11:13:05 +01003663 }
William Juul0e8cc8b2007-11-15 11:13:05 +01003664 }
3665
3666 /* Update file object */
3667
Charles Manning753ac612012-05-09 16:55:17 +00003668 if ((start_write + n_done) > in->variant.file_variant.file_size)
3669 in->variant.file_variant.file_size = (start_write + n_done);
William Juul0e8cc8b2007-11-15 11:13:05 +01003670
3671 in->dirty = 1;
Charles Manning753ac612012-05-09 16:55:17 +00003672 return n_done;
William Juul0e8cc8b2007-11-15 11:13:05 +01003673}
3674
Charles Manning753ac612012-05-09 16:55:17 +00003675int yaffs_wr_file(struct yaffs_obj *in, const u8 *buffer, loff_t offset,
3676 int n_bytes, int write_through)
3677{
3678 yaffs2_handle_hole(in, offset);
3679 return yaffs_do_file_wr(in, buffer, offset, n_bytes, write_through);
3680}
William Juul0e8cc8b2007-11-15 11:13:05 +01003681
3682/* ---------------------- File resizing stuff ------------------ */
3683
Charles Manning753ac612012-05-09 16:55:17 +00003684static void yaffs_prune_chunks(struct yaffs_obj *in, loff_t new_size)
William Juul0e8cc8b2007-11-15 11:13:05 +01003685{
3686
Charles Manning753ac612012-05-09 16:55:17 +00003687 struct yaffs_dev *dev = in->my_dev;
3688 loff_t old_size = in->variant.file_variant.file_size;
William Juul0e8cc8b2007-11-15 11:13:05 +01003689 int i;
Charles Manning753ac612012-05-09 16:55:17 +00003690 int chunk_id;
3691 u32 dummy;
3692 int last_del;
3693 int start_del;
3694
3695 if (old_size > 0)
3696 yaffs_addr_to_chunk(dev, old_size - 1, &last_del, &dummy);
3697 else
3698 last_del = 0;
3699
3700 yaffs_addr_to_chunk(dev, new_size + dev->data_bytes_per_chunk - 1,
3701 &start_del, &dummy);
3702 last_del++;
3703 start_del++;
William Juul0e8cc8b2007-11-15 11:13:05 +01003704
3705 /* Delete backwards so that we don't end up with holes if
3706 * power is lost part-way through the operation.
3707 */
Charles Manning753ac612012-05-09 16:55:17 +00003708 for (i = last_del; i >= start_del; i--) {
William Juul0e8cc8b2007-11-15 11:13:05 +01003709 /* NB this could be optimised somewhat,
3710 * eg. could retrieve the tags and write them without
Charles Manning753ac612012-05-09 16:55:17 +00003711 * using yaffs_chunk_del
William Juul0e8cc8b2007-11-15 11:13:05 +01003712 */
3713
Charles Manning753ac612012-05-09 16:55:17 +00003714 chunk_id = yaffs_find_del_file_chunk(in, i, NULL);
3715
3716 if (chunk_id < 1)
3717 continue;
3718
3719 if (chunk_id <
3720 (dev->internal_start_block * dev->param.chunks_per_block) ||
3721 chunk_id >=
3722 ((dev->internal_end_block + 1) *
3723 dev->param.chunks_per_block)) {
3724 yaffs_trace(YAFFS_TRACE_ALWAYS,
3725 "Found daft chunk_id %d for %d",
3726 chunk_id, i);
3727 } else {
3728 in->n_data_chunks--;
3729 yaffs_chunk_del(dev, chunk_id, 1, __LINE__);
William Juul0e8cc8b2007-11-15 11:13:05 +01003730 }
3731 }
William Juul0e8cc8b2007-11-15 11:13:05 +01003732}
3733
Charles Manning753ac612012-05-09 16:55:17 +00003734void yaffs_resize_file_down(struct yaffs_obj *obj, loff_t new_size)
William Juul0e8cc8b2007-11-15 11:13:05 +01003735{
Charles Manning753ac612012-05-09 16:55:17 +00003736 int new_full;
3737 u32 new_partial;
3738 struct yaffs_dev *dev = obj->my_dev;
William Juul0e8cc8b2007-11-15 11:13:05 +01003739
Charles Manning753ac612012-05-09 16:55:17 +00003740 yaffs_addr_to_chunk(dev, new_size, &new_full, &new_partial);
Wolfgang Denk4b070802008-08-14 14:41:06 +02003741
Charles Manning753ac612012-05-09 16:55:17 +00003742 yaffs_prune_chunks(obj, new_size);
William Juul0e8cc8b2007-11-15 11:13:05 +01003743
Charles Manning753ac612012-05-09 16:55:17 +00003744 if (new_partial != 0) {
3745 int last_chunk = 1 + new_full;
3746 u8 *local_buffer = yaffs_get_temp_buffer(dev);
William Juul0e8cc8b2007-11-15 11:13:05 +01003747
Charles Manning753ac612012-05-09 16:55:17 +00003748 /* Rewrite the last chunk with its new size and zero pad */
3749 yaffs_rd_data_obj(obj, last_chunk, local_buffer);
3750 memset(local_buffer + new_partial, 0,
3751 dev->data_bytes_per_chunk - new_partial);
William Juul0e8cc8b2007-11-15 11:13:05 +01003752
Charles Manning753ac612012-05-09 16:55:17 +00003753 yaffs_wr_data_obj(obj, last_chunk, local_buffer,
3754 new_partial, 1);
William Juul0e8cc8b2007-11-15 11:13:05 +01003755
Charles Manning753ac612012-05-09 16:55:17 +00003756 yaffs_release_temp_buffer(dev, local_buffer);
William Juul0e8cc8b2007-11-15 11:13:05 +01003757 }
3758
Charles Manning753ac612012-05-09 16:55:17 +00003759 obj->variant.file_variant.file_size = new_size;
William Juul0e8cc8b2007-11-15 11:13:05 +01003760
Charles Manning753ac612012-05-09 16:55:17 +00003761 yaffs_prune_tree(dev, &obj->variant.file_variant);
3762}
William Juul0e8cc8b2007-11-15 11:13:05 +01003763
Charles Manning753ac612012-05-09 16:55:17 +00003764int yaffs_resize_file(struct yaffs_obj *in, loff_t new_size)
3765{
3766 struct yaffs_dev *dev = in->my_dev;
3767 loff_t old_size = in->variant.file_variant.file_size;
William Juul0e8cc8b2007-11-15 11:13:05 +01003768
Charles Manning753ac612012-05-09 16:55:17 +00003769 yaffs_flush_file_cache(in);
3770 yaffs_invalidate_whole_cache(in);
Wolfgang Denk4b070802008-08-14 14:41:06 +02003771
Charles Manning753ac612012-05-09 16:55:17 +00003772 yaffs_check_gc(dev, 0);
William Juul0e8cc8b2007-11-15 11:13:05 +01003773
Charles Manning753ac612012-05-09 16:55:17 +00003774 if (in->variant_type != YAFFS_OBJECT_TYPE_FILE)
3775 return YAFFS_FAIL;
William Juul0e8cc8b2007-11-15 11:13:05 +01003776
Charles Manning753ac612012-05-09 16:55:17 +00003777 if (new_size == old_size)
3778 return YAFFS_OK;
William Juul0e8cc8b2007-11-15 11:13:05 +01003779
Charles Manning753ac612012-05-09 16:55:17 +00003780 if (new_size > old_size) {
3781 yaffs2_handle_hole(in, new_size);
3782 in->variant.file_variant.file_size = new_size;
William Juul0e8cc8b2007-11-15 11:13:05 +01003783 } else {
Charles Manning753ac612012-05-09 16:55:17 +00003784 /* new_size < old_size */
3785 yaffs_resize_file_down(in, new_size);
William Juul0e8cc8b2007-11-15 11:13:05 +01003786 }
3787
Charles Manning753ac612012-05-09 16:55:17 +00003788 /* Write a new object header to reflect the resize.
William Juul0e8cc8b2007-11-15 11:13:05 +01003789 * show we've shrunk the file, if need be
Charles Manning753ac612012-05-09 16:55:17 +00003790 * Do this only if the file is not in the deleted directories
3791 * and is not shadowed.
William Juul0e8cc8b2007-11-15 11:13:05 +01003792 */
Charles Manning753ac612012-05-09 16:55:17 +00003793 if (in->parent &&
3794 !in->is_shadowed &&
3795 in->parent->obj_id != YAFFS_OBJECTID_UNLINKED &&
3796 in->parent->obj_id != YAFFS_OBJECTID_DELETED)
3797 yaffs_update_oh(in, NULL, 0, 0, 0, NULL);
William Juul0e8cc8b2007-11-15 11:13:05 +01003798
3799 return YAFFS_OK;
3800}
3801
Charles Manning753ac612012-05-09 16:55:17 +00003802int yaffs_flush_file(struct yaffs_obj *in, int update_time, int data_sync)
William Juul0e8cc8b2007-11-15 11:13:05 +01003803{
Charles Manning753ac612012-05-09 16:55:17 +00003804 if (!in->dirty)
3805 return YAFFS_OK;
William Juul0e8cc8b2007-11-15 11:13:05 +01003806
Charles Manning753ac612012-05-09 16:55:17 +00003807 yaffs_flush_file_cache(in);
3808
3809 if (data_sync)
3810 return YAFFS_OK;
3811
3812 if (update_time)
3813 yaffs_load_current_time(in, 0, 0);
3814
3815 return (yaffs_update_oh(in, NULL, 0, 0, 0, NULL) >= 0) ?
3816 YAFFS_OK : YAFFS_FAIL;
William Juul0e8cc8b2007-11-15 11:13:05 +01003817}
3818
3819
Charles Manning753ac612012-05-09 16:55:17 +00003820/* yaffs_del_file deletes the whole file data
William Juul0e8cc8b2007-11-15 11:13:05 +01003821 * and the inode associated with the file.
3822 * It does not delete the links associated with the file.
3823 */
Charles Manning753ac612012-05-09 16:55:17 +00003824static int yaffs_unlink_file_if_needed(struct yaffs_obj *in)
William Juul0e8cc8b2007-11-15 11:13:05 +01003825{
Charles Manning753ac612012-05-09 16:55:17 +00003826 int ret_val;
3827 int del_now = 0;
3828 struct yaffs_dev *dev = in->my_dev;
William Juul0e8cc8b2007-11-15 11:13:05 +01003829
Charles Manning753ac612012-05-09 16:55:17 +00003830 if (!in->my_inode)
3831 del_now = 1;
William Juul0e8cc8b2007-11-15 11:13:05 +01003832
Charles Manning753ac612012-05-09 16:55:17 +00003833 if (del_now) {
3834 ret_val =
3835 yaffs_change_obj_name(in, in->my_dev->del_dir,
3836 _Y("deleted"), 0, 0);
3837 yaffs_trace(YAFFS_TRACE_TRACING,
3838 "yaffs: immediate deletion of file %d",
3839 in->obj_id);
3840 in->deleted = 1;
3841 in->my_dev->n_deleted_files++;
3842 if (dev->param.disable_soft_del || dev->param.is_yaffs2)
3843 yaffs_resize_file(in, 0);
3844 yaffs_soft_del_file(in);
3845 } else {
3846 ret_val =
3847 yaffs_change_obj_name(in, in->my_dev->unlinked_dir,
3848 _Y("unlinked"), 0, 0);
William Juul0e8cc8b2007-11-15 11:13:05 +01003849 }
Charles Manning753ac612012-05-09 16:55:17 +00003850 return ret_val;
William Juul0e8cc8b2007-11-15 11:13:05 +01003851}
3852
Charles Manning753ac612012-05-09 16:55:17 +00003853int yaffs_del_file(struct yaffs_obj *in)
William Juul0e8cc8b2007-11-15 11:13:05 +01003854{
Charles Manning753ac612012-05-09 16:55:17 +00003855 int ret_val = YAFFS_OK;
3856 int deleted; /* Need to cache value on stack if in is freed */
3857 struct yaffs_dev *dev = in->my_dev;
William Juul0e8cc8b2007-11-15 11:13:05 +01003858
Charles Manning753ac612012-05-09 16:55:17 +00003859 if (dev->param.disable_soft_del || dev->param.is_yaffs2)
3860 yaffs_resize_file(in, 0);
3861
3862 if (in->n_data_chunks > 0) {
3863 /* Use soft deletion if there is data in the file.
3864 * That won't be the case if it has been resized to zero.
3865 */
3866 if (!in->unlinked)
3867 ret_val = yaffs_unlink_file_if_needed(in);
3868
3869 deleted = in->deleted;
3870
3871 if (ret_val == YAFFS_OK && in->unlinked && !in->deleted) {
William Juul0e8cc8b2007-11-15 11:13:05 +01003872 in->deleted = 1;
Charles Manning753ac612012-05-09 16:55:17 +00003873 deleted = 1;
3874 in->my_dev->n_deleted_files++;
3875 yaffs_soft_del_file(in);
William Juul0e8cc8b2007-11-15 11:13:05 +01003876 }
Charles Manning753ac612012-05-09 16:55:17 +00003877 return deleted ? YAFFS_OK : YAFFS_FAIL;
William Juul0e8cc8b2007-11-15 11:13:05 +01003878 } else {
3879 /* The file has no data chunks so we toss it immediately */
Charles Manning753ac612012-05-09 16:55:17 +00003880 yaffs_free_tnode(in->my_dev, in->variant.file_variant.top);
3881 in->variant.file_variant.top = NULL;
3882 yaffs_generic_obj_del(in);
William Juul0e8cc8b2007-11-15 11:13:05 +01003883
3884 return YAFFS_OK;
3885 }
3886}
3887
Charles Manning753ac612012-05-09 16:55:17 +00003888int yaffs_is_non_empty_dir(struct yaffs_obj *obj)
3889{
3890 return (obj &&
3891 obj->variant_type == YAFFS_OBJECT_TYPE_DIRECTORY) &&
3892 !(list_empty(&obj->variant.dir_variant.children));
3893}
3894
3895static int yaffs_del_dir(struct yaffs_obj *obj)
William Juul0e8cc8b2007-11-15 11:13:05 +01003896{
3897 /* First check that the directory is empty. */
Charles Manning753ac612012-05-09 16:55:17 +00003898 if (yaffs_is_non_empty_dir(obj))
3899 return YAFFS_FAIL;
William Juul0e8cc8b2007-11-15 11:13:05 +01003900
Charles Manning753ac612012-05-09 16:55:17 +00003901 return yaffs_generic_obj_del(obj);
William Juul0e8cc8b2007-11-15 11:13:05 +01003902}
3903
Charles Manning753ac612012-05-09 16:55:17 +00003904static int yaffs_del_symlink(struct yaffs_obj *in)
William Juul0e8cc8b2007-11-15 11:13:05 +01003905{
Charles Manning753ac612012-05-09 16:55:17 +00003906 kfree(in->variant.symlink_variant.alias);
3907 in->variant.symlink_variant.alias = NULL;
William Juul0e8cc8b2007-11-15 11:13:05 +01003908
Charles Manning753ac612012-05-09 16:55:17 +00003909 return yaffs_generic_obj_del(in);
William Juul0e8cc8b2007-11-15 11:13:05 +01003910}
3911
Charles Manning753ac612012-05-09 16:55:17 +00003912static int yaffs_del_link(struct yaffs_obj *in)
William Juul0e8cc8b2007-11-15 11:13:05 +01003913{
Charles Manning753ac612012-05-09 16:55:17 +00003914 /* remove this hardlink from the list associated with the equivalent
William Juul0e8cc8b2007-11-15 11:13:05 +01003915 * object
3916 */
Charles Manning753ac612012-05-09 16:55:17 +00003917 list_del_init(&in->hard_links);
3918 return yaffs_generic_obj_del(in);
William Juul0e8cc8b2007-11-15 11:13:05 +01003919}
3920
Charles Manning753ac612012-05-09 16:55:17 +00003921int yaffs_del_obj(struct yaffs_obj *obj)
William Juul0e8cc8b2007-11-15 11:13:05 +01003922{
Charles Manning753ac612012-05-09 16:55:17 +00003923 int ret_val = -1;
3924
3925 switch (obj->variant_type) {
William Juul0e8cc8b2007-11-15 11:13:05 +01003926 case YAFFS_OBJECT_TYPE_FILE:
Charles Manning753ac612012-05-09 16:55:17 +00003927 ret_val = yaffs_del_file(obj);
William Juul0e8cc8b2007-11-15 11:13:05 +01003928 break;
3929 case YAFFS_OBJECT_TYPE_DIRECTORY:
Charles Manning753ac612012-05-09 16:55:17 +00003930 if (!list_empty(&obj->variant.dir_variant.dirty)) {
3931 yaffs_trace(YAFFS_TRACE_BACKGROUND,
3932 "Remove object %d from dirty directories",
3933 obj->obj_id);
3934 list_del_init(&obj->variant.dir_variant.dirty);
3935 }
3936 return yaffs_del_dir(obj);
William Juul0e8cc8b2007-11-15 11:13:05 +01003937 break;
3938 case YAFFS_OBJECT_TYPE_SYMLINK:
Charles Manning753ac612012-05-09 16:55:17 +00003939 ret_val = yaffs_del_symlink(obj);
William Juul0e8cc8b2007-11-15 11:13:05 +01003940 break;
3941 case YAFFS_OBJECT_TYPE_HARDLINK:
Charles Manning753ac612012-05-09 16:55:17 +00003942 ret_val = yaffs_del_link(obj);
William Juul0e8cc8b2007-11-15 11:13:05 +01003943 break;
3944 case YAFFS_OBJECT_TYPE_SPECIAL:
Charles Manning753ac612012-05-09 16:55:17 +00003945 ret_val = yaffs_generic_obj_del(obj);
William Juul0e8cc8b2007-11-15 11:13:05 +01003946 break;
3947 case YAFFS_OBJECT_TYPE_UNKNOWN:
Charles Manning753ac612012-05-09 16:55:17 +00003948 ret_val = 0;
William Juul0e8cc8b2007-11-15 11:13:05 +01003949 break; /* should not happen. */
3950 }
Charles Manning753ac612012-05-09 16:55:17 +00003951 return ret_val;
William Juul0e8cc8b2007-11-15 11:13:05 +01003952}
3953
Charles Manning753ac612012-05-09 16:55:17 +00003954static int yaffs_unlink_worker(struct yaffs_obj *obj)
William Juul0e8cc8b2007-11-15 11:13:05 +01003955{
Charles Manning753ac612012-05-09 16:55:17 +00003956 int del_now = 0;
William Juul0e8cc8b2007-11-15 11:13:05 +01003957
Charles Manning753ac612012-05-09 16:55:17 +00003958 if (!obj)
3959 return YAFFS_FAIL;
3960
3961 if (!obj->my_inode)
3962 del_now = 1;
3963
3964 yaffs_update_parent(obj->parent);
3965
3966 if (obj->variant_type == YAFFS_OBJECT_TYPE_HARDLINK) {
3967 return yaffs_del_link(obj);
3968 } else if (!list_empty(&obj->hard_links)) {
William Juul0e8cc8b2007-11-15 11:13:05 +01003969 /* Curve ball: We're unlinking an object that has a hardlink.
3970 *
3971 * This problem arises because we are not strictly following
3972 * The Linux link/inode model.
3973 *
3974 * We can't really delete the object.
3975 * Instead, we do the following:
3976 * - Select a hardlink.
3977 * - Unhook it from the hard links
Charles Manning753ac612012-05-09 16:55:17 +00003978 * - Move it from its parent directory so that the rename works.
William Juul0e8cc8b2007-11-15 11:13:05 +01003979 * - Rename the object to the hardlink's name.
3980 * - Delete the hardlink
3981 */
3982
Charles Manning753ac612012-05-09 16:55:17 +00003983 struct yaffs_obj *hl;
3984 struct yaffs_obj *parent;
3985 int ret_val;
William Juul0e8cc8b2007-11-15 11:13:05 +01003986 YCHAR name[YAFFS_MAX_NAME_LENGTH + 1];
3987
Charles Manning753ac612012-05-09 16:55:17 +00003988 hl = list_entry(obj->hard_links.next, struct yaffs_obj,
3989 hard_links);
William Juul0e8cc8b2007-11-15 11:13:05 +01003990
Charles Manning753ac612012-05-09 16:55:17 +00003991 yaffs_get_obj_name(hl, name, YAFFS_MAX_NAME_LENGTH + 1);
3992 parent = hl->parent;
William Juul0e8cc8b2007-11-15 11:13:05 +01003993
Charles Manning753ac612012-05-09 16:55:17 +00003994 list_del_init(&hl->hard_links);
William Juul0e8cc8b2007-11-15 11:13:05 +01003995
Charles Manning753ac612012-05-09 16:55:17 +00003996 yaffs_add_obj_to_dir(obj->my_dev->unlinked_dir, hl);
William Juul0e8cc8b2007-11-15 11:13:05 +01003997
Charles Manning753ac612012-05-09 16:55:17 +00003998 ret_val = yaffs_change_obj_name(obj, parent, name, 0, 0);
William Juul0e8cc8b2007-11-15 11:13:05 +01003999
Charles Manning753ac612012-05-09 16:55:17 +00004000 if (ret_val == YAFFS_OK)
4001 ret_val = yaffs_generic_obj_del(hl);
4002
4003 return ret_val;
4004
4005 } else if (del_now) {
4006 switch (obj->variant_type) {
William Juul0e8cc8b2007-11-15 11:13:05 +01004007 case YAFFS_OBJECT_TYPE_FILE:
Charles Manning753ac612012-05-09 16:55:17 +00004008 return yaffs_del_file(obj);
William Juul0e8cc8b2007-11-15 11:13:05 +01004009 break;
4010 case YAFFS_OBJECT_TYPE_DIRECTORY:
Charles Manning753ac612012-05-09 16:55:17 +00004011 list_del_init(&obj->variant.dir_variant.dirty);
4012 return yaffs_del_dir(obj);
William Juul0e8cc8b2007-11-15 11:13:05 +01004013 break;
4014 case YAFFS_OBJECT_TYPE_SYMLINK:
Charles Manning753ac612012-05-09 16:55:17 +00004015 return yaffs_del_symlink(obj);
William Juul0e8cc8b2007-11-15 11:13:05 +01004016 break;
4017 case YAFFS_OBJECT_TYPE_SPECIAL:
Charles Manning753ac612012-05-09 16:55:17 +00004018 return yaffs_generic_obj_del(obj);
William Juul0e8cc8b2007-11-15 11:13:05 +01004019 break;
4020 case YAFFS_OBJECT_TYPE_HARDLINK:
4021 case YAFFS_OBJECT_TYPE_UNKNOWN:
4022 default:
4023 return YAFFS_FAIL;
4024 }
Charles Manning753ac612012-05-09 16:55:17 +00004025 } else if (yaffs_is_non_empty_dir(obj)) {
4026 return YAFFS_FAIL;
4027 } else {
4028 return yaffs_change_obj_name(obj, obj->my_dev->unlinked_dir,
4029 _Y("unlinked"), 0, 0);
William Juul0e8cc8b2007-11-15 11:13:05 +01004030 }
4031}
4032
Charles Manning753ac612012-05-09 16:55:17 +00004033static int yaffs_unlink_obj(struct yaffs_obj *obj)
William Juul0e8cc8b2007-11-15 11:13:05 +01004034{
Charles Manning753ac612012-05-09 16:55:17 +00004035 if (obj && obj->unlink_allowed)
4036 return yaffs_unlink_worker(obj);
William Juul0e8cc8b2007-11-15 11:13:05 +01004037
4038 return YAFFS_FAIL;
William Juul0e8cc8b2007-11-15 11:13:05 +01004039}
William Juul0e8cc8b2007-11-15 11:13:05 +01004040
Charles Manning753ac612012-05-09 16:55:17 +00004041int yaffs_unlinker(struct yaffs_obj *dir, const YCHAR *name)
4042{
4043 struct yaffs_obj *obj;
4044
4045 obj = yaffs_find_by_name(dir, name);
4046 return yaffs_unlink_obj(obj);
4047}
4048
4049/* Note:
4050 * If old_name is NULL then we take old_dir as the object to be renamed.
4051 */
4052int yaffs_rename_obj(struct yaffs_obj *old_dir, const YCHAR *old_name,
4053 struct yaffs_obj *new_dir, const YCHAR *new_name)
4054{
4055 struct yaffs_obj *obj = NULL;
4056 struct yaffs_obj *existing_target = NULL;
4057 int force = 0;
4058 int result;
4059 struct yaffs_dev *dev;
4060
4061 if (!old_dir || old_dir->variant_type != YAFFS_OBJECT_TYPE_DIRECTORY) {
4062 BUG();
4063 return YAFFS_FAIL;
4064 }
4065 if (!new_dir || new_dir->variant_type != YAFFS_OBJECT_TYPE_DIRECTORY) {
4066 BUG();
4067 return YAFFS_FAIL;
4068 }
4069
4070 dev = old_dir->my_dev;
4071
4072#ifdef CONFIG_YAFFS_CASE_INSENSITIVE
4073 /* Special case for case insemsitive systems.
4074 * While look-up is case insensitive, the name isn't.
4075 * Therefore we might want to change x.txt to X.txt
4076 */
4077 if (old_dir == new_dir &&
4078 old_name && new_name &&
4079 yaffs_strcmp(old_name, new_name) == 0)
4080 force = 1;
4081#endif
4082
4083 if (yaffs_strnlen(new_name, YAFFS_MAX_NAME_LENGTH + 1) >
4084 YAFFS_MAX_NAME_LENGTH)
4085 /* ENAMETOOLONG */
4086 return YAFFS_FAIL;
4087
4088 if (old_name)
4089 obj = yaffs_find_by_name(old_dir, old_name);
4090 else{
4091 obj = old_dir;
4092 old_dir = obj->parent;
4093 }
4094
4095 if (obj && obj->rename_allowed) {
4096 /* Now handle an existing target, if there is one */
4097 existing_target = yaffs_find_by_name(new_dir, new_name);
4098 if (yaffs_is_non_empty_dir(existing_target)) {
4099 return YAFFS_FAIL; /* ENOTEMPTY */
4100 } else if (existing_target && existing_target != obj) {
4101 /* Nuke the target first, using shadowing,
4102 * but only if it isn't the same object.
4103 *
4104 * Note we must disable gc here otherwise it can mess
4105 * up the shadowing.
4106 *
4107 */
4108 dev->gc_disable = 1;
4109 yaffs_change_obj_name(obj, new_dir, new_name, force,
4110 existing_target->obj_id);
4111 existing_target->is_shadowed = 1;
4112 yaffs_unlink_obj(existing_target);
4113 dev->gc_disable = 0;
4114 }
4115
4116 result = yaffs_change_obj_name(obj, new_dir, new_name, 1, 0);
4117
4118 yaffs_update_parent(old_dir);
4119 if (new_dir != old_dir)
4120 yaffs_update_parent(new_dir);
4121
4122 return result;
4123 }
4124 return YAFFS_FAIL;
William Juul0e8cc8b2007-11-15 11:13:05 +01004125}
4126
4127/*----------------------- Initialisation Scanning ---------------------- */
4128
Charles Manning753ac612012-05-09 16:55:17 +00004129void yaffs_handle_shadowed_obj(struct yaffs_dev *dev, int obj_id,
4130 int backward_scanning)
William Juul0e8cc8b2007-11-15 11:13:05 +01004131{
Charles Manning753ac612012-05-09 16:55:17 +00004132 struct yaffs_obj *obj;
William Juul0e8cc8b2007-11-15 11:13:05 +01004133
Charles Manning753ac612012-05-09 16:55:17 +00004134 if (backward_scanning) {
William Juul0e8cc8b2007-11-15 11:13:05 +01004135 /* Handle YAFFS2 case (backward scanning)
4136 * If the shadowed object exists then ignore.
4137 */
Charles Manning753ac612012-05-09 16:55:17 +00004138 obj = yaffs_find_by_number(dev, obj_id);
4139 if (obj)
William Juul0e8cc8b2007-11-15 11:13:05 +01004140 return;
William Juul0e8cc8b2007-11-15 11:13:05 +01004141 }
4142
Charles Manning753ac612012-05-09 16:55:17 +00004143 /* Let's create it (if it does not exist) assuming it is a file so that
4144 * it can do shrinking etc.
William Juul0e8cc8b2007-11-15 11:13:05 +01004145 * We put it in unlinked dir to be cleaned up after the scanning
4146 */
4147 obj =
Charles Manning753ac612012-05-09 16:55:17 +00004148 yaffs_find_or_create_by_number(dev, obj_id, YAFFS_OBJECT_TYPE_FILE);
4149 if (!obj)
4150 return;
4151 obj->is_shadowed = 1;
4152 yaffs_add_obj_to_dir(dev->unlinked_dir, obj);
4153 obj->variant.file_variant.shrink_size = 0;
4154 obj->valid = 1; /* So that we don't read any other info. */
William Juul0e8cc8b2007-11-15 11:13:05 +01004155}
4156
Charles Manning753ac612012-05-09 16:55:17 +00004157void yaffs_link_fixup(struct yaffs_dev *dev, struct list_head *hard_list)
William Juul0e8cc8b2007-11-15 11:13:05 +01004158{
Charles Manning753ac612012-05-09 16:55:17 +00004159 struct list_head *lh;
4160 struct list_head *save;
4161 struct yaffs_obj *hl;
4162 struct yaffs_obj *in;
Wolfgang Denk4b070802008-08-14 14:41:06 +02004163
Charles Manning753ac612012-05-09 16:55:17 +00004164 list_for_each_safe(lh, save, hard_list) {
4165 hl = list_entry(lh, struct yaffs_obj, hard_links);
4166 in = yaffs_find_by_number(dev,
4167 hl->variant.hardlink_variant.equiv_id);
William Juul0e8cc8b2007-11-15 11:13:05 +01004168
4169 if (in) {
4170 /* Add the hardlink pointers */
Charles Manning753ac612012-05-09 16:55:17 +00004171 hl->variant.hardlink_variant.equiv_obj = in;
4172 list_add(&hl->hard_links, &in->hard_links);
William Juul0e8cc8b2007-11-15 11:13:05 +01004173 } else {
4174 /* Todo Need to report/handle this better.
4175 * Got a problem... hardlink to a non-existant object
4176 */
Charles Manning753ac612012-05-09 16:55:17 +00004177 hl->variant.hardlink_variant.equiv_obj = NULL;
4178 INIT_LIST_HEAD(&hl->hard_links);
William Juul0e8cc8b2007-11-15 11:13:05 +01004179 }
William Juul0e8cc8b2007-11-15 11:13:05 +01004180 }
William Juul0e8cc8b2007-11-15 11:13:05 +01004181}
4182
Charles Manning753ac612012-05-09 16:55:17 +00004183static void yaffs_strip_deleted_objs(struct yaffs_dev *dev)
William Juul0e8cc8b2007-11-15 11:13:05 +01004184{
Charles Manning753ac612012-05-09 16:55:17 +00004185 /*
4186 * Sort out state of unlinked and deleted objects after scanning.
William Juul0e8cc8b2007-11-15 11:13:05 +01004187 */
Charles Manning753ac612012-05-09 16:55:17 +00004188 struct list_head *i;
4189 struct list_head *n;
4190 struct yaffs_obj *l;
William Juul0e8cc8b2007-11-15 11:13:05 +01004191
Charles Manning753ac612012-05-09 16:55:17 +00004192 if (dev->read_only)
William Juul0e8cc8b2007-11-15 11:13:05 +01004193 return;
Wolfgang Denk4b070802008-08-14 14:41:06 +02004194
Charles Manning753ac612012-05-09 16:55:17 +00004195 /* Soft delete all the unlinked files */
4196 list_for_each_safe(i, n,
4197 &dev->unlinked_dir->variant.dir_variant.children) {
4198 l = list_entry(i, struct yaffs_obj, siblings);
4199 yaffs_del_obj(l);
4200 }
William Juul0e8cc8b2007-11-15 11:13:05 +01004201
Charles Manning753ac612012-05-09 16:55:17 +00004202 list_for_each_safe(i, n, &dev->del_dir->variant.dir_variant.children) {
4203 l = list_entry(i, struct yaffs_obj, siblings);
4204 yaffs_del_obj(l);
William Juul0e8cc8b2007-11-15 11:13:05 +01004205 }
4206}
4207
Charles Manning753ac612012-05-09 16:55:17 +00004208/*
4209 * This code iterates through all the objects making sure that they are rooted.
4210 * Any unrooted objects are re-rooted in lost+found.
4211 * An object needs to be in one of:
4212 * - Directly under deleted, unlinked
4213 * - Directly or indirectly under root.
4214 *
4215 * Note:
4216 * This code assumes that we don't ever change the current relationships
4217 * between directories:
4218 * root_dir->parent == unlinked_dir->parent == del_dir->parent == NULL
4219 * lost-n-found->parent == root_dir
4220 *
4221 * This fixes the problem where directories might have inadvertently been
4222 * deleted leaving the object "hanging" without being rooted in the
4223 * directory tree.
4224 */
4225
4226static int yaffs_has_null_parent(struct yaffs_dev *dev, struct yaffs_obj *obj)
William Juul0e8cc8b2007-11-15 11:13:05 +01004227{
Charles Manning753ac612012-05-09 16:55:17 +00004228 return (obj == dev->del_dir ||
4229 obj == dev->unlinked_dir || obj == dev->root_dir);
4230}
William Juul0e8cc8b2007-11-15 11:13:05 +01004231
Charles Manning753ac612012-05-09 16:55:17 +00004232static void yaffs_fix_hanging_objs(struct yaffs_dev *dev)
4233{
4234 struct yaffs_obj *obj;
4235 struct yaffs_obj *parent;
4236 int i;
4237 struct list_head *lh;
4238 struct list_head *n;
4239 int depth_limit;
4240 int hanging;
Wolfgang Denk4b070802008-08-14 14:41:06 +02004241
Charles Manning753ac612012-05-09 16:55:17 +00004242 if (dev->read_only)
4243 return;
Wolfgang Denk4b070802008-08-14 14:41:06 +02004244
Charles Manning753ac612012-05-09 16:55:17 +00004245 /* Iterate through the objects in each hash entry,
4246 * looking at each object.
4247 * Make sure it is rooted.
William Juul0e8cc8b2007-11-15 11:13:05 +01004248 */
Wolfgang Denk4b070802008-08-14 14:41:06 +02004249
Charles Manning753ac612012-05-09 16:55:17 +00004250 for (i = 0; i < YAFFS_NOBJECT_BUCKETS; i++) {
4251 list_for_each_safe(lh, n, &dev->obj_bucket[i].list) {
4252 obj = list_entry(lh, struct yaffs_obj, hash_link);
4253 parent = obj->parent;
Wolfgang Denk4b070802008-08-14 14:41:06 +02004254
Charles Manning753ac612012-05-09 16:55:17 +00004255 if (yaffs_has_null_parent(dev, obj)) {
4256 /* These directories are not hanging */
4257 hanging = 0;
4258 } else if (!parent ||
4259 parent->variant_type !=
4260 YAFFS_OBJECT_TYPE_DIRECTORY) {
4261 hanging = 1;
4262 } else if (yaffs_has_null_parent(dev, parent)) {
4263 hanging = 0;
4264 } else {
4265 /*
4266 * Need to follow the parent chain to
4267 * see if it is hanging.
4268 */
4269 hanging = 0;
4270 depth_limit = 100;
William Juul0e8cc8b2007-11-15 11:13:05 +01004271
Charles Manning753ac612012-05-09 16:55:17 +00004272 while (parent != dev->root_dir &&
4273 parent->parent &&
4274 parent->parent->variant_type ==
4275 YAFFS_OBJECT_TYPE_DIRECTORY &&
4276 depth_limit > 0) {
4277 parent = parent->parent;
4278 depth_limit--;
4279 }
4280 if (parent != dev->root_dir)
4281 hanging = 1;
William Juul0e8cc8b2007-11-15 11:13:05 +01004282 }
Charles Manning753ac612012-05-09 16:55:17 +00004283 if (hanging) {
4284 yaffs_trace(YAFFS_TRACE_SCAN,
4285 "Hanging object %d moved to lost and found",
4286 obj->obj_id);
4287 yaffs_add_obj_to_dir(dev->lost_n_found, obj);
William Juul0e8cc8b2007-11-15 11:13:05 +01004288 }
4289 }
4290 }
William Juul0e8cc8b2007-11-15 11:13:05 +01004291}
4292
Charles Manning753ac612012-05-09 16:55:17 +00004293/*
4294 * Delete directory contents for cleaning up lost and found.
4295 */
4296static void yaffs_del_dir_contents(struct yaffs_obj *dir)
William Juul0e8cc8b2007-11-15 11:13:05 +01004297{
Charles Manning753ac612012-05-09 16:55:17 +00004298 struct yaffs_obj *obj;
4299 struct list_head *lh;
4300 struct list_head *n;
Wolfgang Denk4b070802008-08-14 14:41:06 +02004301
Charles Manning753ac612012-05-09 16:55:17 +00004302 if (dir->variant_type != YAFFS_OBJECT_TYPE_DIRECTORY)
4303 BUG();
Wolfgang Denk4b070802008-08-14 14:41:06 +02004304
Charles Manning753ac612012-05-09 16:55:17 +00004305 list_for_each_safe(lh, n, &dir->variant.dir_variant.children) {
4306 obj = list_entry(lh, struct yaffs_obj, siblings);
4307 if (obj->variant_type == YAFFS_OBJECT_TYPE_DIRECTORY)
4308 yaffs_del_dir_contents(obj);
4309 yaffs_trace(YAFFS_TRACE_SCAN,
4310 "Deleting lost_found object %d",
4311 obj->obj_id);
4312 yaffs_unlink_obj(obj);
4313 }
William Juul0e8cc8b2007-11-15 11:13:05 +01004314}
4315
Charles Manning753ac612012-05-09 16:55:17 +00004316static void yaffs_empty_l_n_f(struct yaffs_dev *dev)
William Juul0e8cc8b2007-11-15 11:13:05 +01004317{
Charles Manning753ac612012-05-09 16:55:17 +00004318 yaffs_del_dir_contents(dev->lost_n_found);
William Juul0e8cc8b2007-11-15 11:13:05 +01004319}
4320
Charles Manning753ac612012-05-09 16:55:17 +00004321
4322struct yaffs_obj *yaffs_find_by_name(struct yaffs_obj *directory,
4323 const YCHAR *name)
William Juul0e8cc8b2007-11-15 11:13:05 +01004324{
4325 int sum;
William Juul0e8cc8b2007-11-15 11:13:05 +01004326 struct list_head *i;
4327 YCHAR buffer[YAFFS_MAX_NAME_LENGTH + 1];
Charles Manning753ac612012-05-09 16:55:17 +00004328 struct yaffs_obj *l;
William Juul0e8cc8b2007-11-15 11:13:05 +01004329
Charles Manning753ac612012-05-09 16:55:17 +00004330 if (!name)
William Juul0e8cc8b2007-11-15 11:13:05 +01004331 return NULL;
William Juul0e8cc8b2007-11-15 11:13:05 +01004332
4333 if (!directory) {
Charles Manning753ac612012-05-09 16:55:17 +00004334 yaffs_trace(YAFFS_TRACE_ALWAYS,
4335 "tragedy: yaffs_find_by_name: null pointer directory"
4336 );
4337 BUG();
4338 return NULL;
William Juul0e8cc8b2007-11-15 11:13:05 +01004339 }
Charles Manning753ac612012-05-09 16:55:17 +00004340 if (directory->variant_type != YAFFS_OBJECT_TYPE_DIRECTORY) {
4341 yaffs_trace(YAFFS_TRACE_ALWAYS,
4342 "tragedy: yaffs_find_by_name: non-directory"
4343 );
4344 BUG();
William Juul0e8cc8b2007-11-15 11:13:05 +01004345 }
4346
Charles Manning753ac612012-05-09 16:55:17 +00004347 sum = yaffs_calc_name_sum(name);
William Juul0e8cc8b2007-11-15 11:13:05 +01004348
Charles Manning753ac612012-05-09 16:55:17 +00004349 list_for_each(i, &directory->variant.dir_variant.children) {
4350 l = list_entry(i, struct yaffs_obj, siblings);
Wolfgang Denk4b070802008-08-14 14:41:06 +02004351
Charles Manning753ac612012-05-09 16:55:17 +00004352 if (l->parent != directory)
4353 BUG();
William Juul0e8cc8b2007-11-15 11:13:05 +01004354
Charles Manning753ac612012-05-09 16:55:17 +00004355 yaffs_check_obj_details_loaded(l);
William Juul0e8cc8b2007-11-15 11:13:05 +01004356
Charles Manning753ac612012-05-09 16:55:17 +00004357 /* Special case for lost-n-found */
4358 if (l->obj_id == YAFFS_OBJECTID_LOSTNFOUND) {
4359 if (!yaffs_strcmp(name, YAFFS_LOSTNFOUND_NAME))
4360 return l;
4361 } else if (l->sum == sum || l->hdr_chunk <= 0) {
4362 /* LostnFound chunk called Objxxx
4363 * Do a real check
4364 */
4365 yaffs_get_obj_name(l, buffer,
4366 YAFFS_MAX_NAME_LENGTH + 1);
4367 if (!yaffs_strncmp(name, buffer, YAFFS_MAX_NAME_LENGTH))
4368 return l;
William Juul0e8cc8b2007-11-15 11:13:05 +01004369 }
4370 }
William Juul0e8cc8b2007-11-15 11:13:05 +01004371 return NULL;
4372}
4373
William Juul0e8cc8b2007-11-15 11:13:05 +01004374/* GetEquivalentObject dereferences any hard links to get to the
4375 * actual object.
4376 */
4377
Charles Manning753ac612012-05-09 16:55:17 +00004378struct yaffs_obj *yaffs_get_equivalent_obj(struct yaffs_obj *obj)
William Juul0e8cc8b2007-11-15 11:13:05 +01004379{
Charles Manning753ac612012-05-09 16:55:17 +00004380 if (obj && obj->variant_type == YAFFS_OBJECT_TYPE_HARDLINK) {
4381 obj = obj->variant.hardlink_variant.equiv_obj;
4382 yaffs_check_obj_details_loaded(obj);
William Juul0e8cc8b2007-11-15 11:13:05 +01004383 }
4384 return obj;
William Juul0e8cc8b2007-11-15 11:13:05 +01004385}
4386
Charles Manning753ac612012-05-09 16:55:17 +00004387/*
4388 * A note or two on object names.
4389 * * If the object name is missing, we then make one up in the form objnnn
4390 *
4391 * * ASCII names are stored in the object header's name field from byte zero
4392 * * Unicode names are historically stored starting from byte zero.
4393 *
4394 * Then there are automatic Unicode names...
4395 * The purpose of these is to save names in a way that can be read as
4396 * ASCII or Unicode names as appropriate, thus allowing a Unicode and ASCII
4397 * system to share files.
4398 *
4399 * These automatic unicode are stored slightly differently...
4400 * - If the name can fit in the ASCII character space then they are saved as
4401 * ascii names as per above.
4402 * - If the name needs Unicode then the name is saved in Unicode
4403 * starting at oh->name[1].
4404
4405 */
4406static void yaffs_fix_null_name(struct yaffs_obj *obj, YCHAR *name,
4407 int buffer_size)
William Juul0e8cc8b2007-11-15 11:13:05 +01004408{
Charles Manning753ac612012-05-09 16:55:17 +00004409 /* Create an object name if we could not find one. */
4410 if (yaffs_strnlen(name, YAFFS_MAX_NAME_LENGTH) == 0) {
4411 YCHAR local_name[20];
4412 YCHAR num_string[20];
4413 YCHAR *x = &num_string[19];
4414 unsigned v = obj->obj_id;
4415 num_string[19] = 0;
4416 while (v > 0) {
4417 x--;
4418 *x = '0' + (v % 10);
4419 v /= 10;
William Juul0e8cc8b2007-11-15 11:13:05 +01004420 }
Charles Manning753ac612012-05-09 16:55:17 +00004421 /* make up a name */
4422 yaffs_strcpy(local_name, YAFFS_LOSTNFOUND_PREFIX);
4423 yaffs_strcat(local_name, x);
4424 yaffs_strncpy(name, local_name, buffer_size - 1);
William Juul0e8cc8b2007-11-15 11:13:05 +01004425 }
William Juul0e8cc8b2007-11-15 11:13:05 +01004426}
4427
Charles Manning753ac612012-05-09 16:55:17 +00004428int yaffs_get_obj_name(struct yaffs_obj *obj, YCHAR *name, int buffer_size)
William Juul0e8cc8b2007-11-15 11:13:05 +01004429{
Charles Manning753ac612012-05-09 16:55:17 +00004430 memset(name, 0, buffer_size * sizeof(YCHAR));
4431 yaffs_check_obj_details_loaded(obj);
4432 if (obj->obj_id == YAFFS_OBJECTID_LOSTNFOUND) {
4433 yaffs_strncpy(name, YAFFS_LOSTNFOUND_NAME, buffer_size - 1);
4434 } else if (obj->short_name[0]) {
4435 yaffs_strcpy(name, obj->short_name);
4436 } else if (obj->hdr_chunk > 0) {
Charles Manning753ac612012-05-09 16:55:17 +00004437 u8 *buffer = yaffs_get_temp_buffer(obj->my_dev);
William Juul0e8cc8b2007-11-15 11:13:05 +01004438
Charles Manning753ac612012-05-09 16:55:17 +00004439 struct yaffs_obj_hdr *oh = (struct yaffs_obj_hdr *)buffer;
William Juul0e8cc8b2007-11-15 11:13:05 +01004440
Charles Manning753ac612012-05-09 16:55:17 +00004441 memset(buffer, 0, obj->my_dev->data_bytes_per_chunk);
4442
4443 if (obj->hdr_chunk > 0) {
Anatolij Gustschin8cc64ba2012-10-05 23:31:03 +00004444 yaffs_rd_chunk_tags_nand(obj->my_dev,
4445 obj->hdr_chunk,
4446 buffer, NULL);
Charles Manning753ac612012-05-09 16:55:17 +00004447 }
4448 yaffs_load_name_from_oh(obj->my_dev, name, oh->name,
4449 buffer_size);
4450
4451 yaffs_release_temp_buffer(obj->my_dev, buffer);
William Juul0e8cc8b2007-11-15 11:13:05 +01004452 }
Charles Manning753ac612012-05-09 16:55:17 +00004453
4454 yaffs_fix_null_name(obj, name, buffer_size);
4455
4456 return yaffs_strnlen(name, YAFFS_MAX_NAME_LENGTH);
4457}
4458
4459loff_t yaffs_get_obj_length(struct yaffs_obj *obj)
4460{
4461 /* Dereference any hard linking */
4462 obj = yaffs_get_equivalent_obj(obj);
4463
4464 if (obj->variant_type == YAFFS_OBJECT_TYPE_FILE)
4465 return obj->variant.file_variant.file_size;
4466 if (obj->variant_type == YAFFS_OBJECT_TYPE_SYMLINK) {
4467 if (!obj->variant.symlink_variant.alias)
4468 return 0;
4469 return yaffs_strnlen(obj->variant.symlink_variant.alias,
4470 YAFFS_MAX_ALIAS_LENGTH);
William Juul0e8cc8b2007-11-15 11:13:05 +01004471 } else {
4472 /* Only a directory should drop through to here */
Charles Manning753ac612012-05-09 16:55:17 +00004473 return obj->my_dev->data_bytes_per_chunk;
William Juul0e8cc8b2007-11-15 11:13:05 +01004474 }
4475}
4476
Charles Manning753ac612012-05-09 16:55:17 +00004477int yaffs_get_obj_link_count(struct yaffs_obj *obj)
William Juul0e8cc8b2007-11-15 11:13:05 +01004478{
4479 int count = 0;
4480 struct list_head *i;
4481
Charles Manning753ac612012-05-09 16:55:17 +00004482 if (!obj->unlinked)
William Juul0e8cc8b2007-11-15 11:13:05 +01004483 count++; /* the object itself */
Charles Manning753ac612012-05-09 16:55:17 +00004484
4485 list_for_each(i, &obj->hard_links)
4486 count++; /* add the hard links; */
4487
William Juul0e8cc8b2007-11-15 11:13:05 +01004488 return count;
William Juul0e8cc8b2007-11-15 11:13:05 +01004489}
4490
Charles Manning753ac612012-05-09 16:55:17 +00004491int yaffs_get_obj_inode(struct yaffs_obj *obj)
William Juul0e8cc8b2007-11-15 11:13:05 +01004492{
Charles Manning753ac612012-05-09 16:55:17 +00004493 obj = yaffs_get_equivalent_obj(obj);
William Juul0e8cc8b2007-11-15 11:13:05 +01004494
Charles Manning753ac612012-05-09 16:55:17 +00004495 return obj->obj_id;
William Juul0e8cc8b2007-11-15 11:13:05 +01004496}
4497
Charles Manning753ac612012-05-09 16:55:17 +00004498unsigned yaffs_get_obj_type(struct yaffs_obj *obj)
William Juul0e8cc8b2007-11-15 11:13:05 +01004499{
Charles Manning753ac612012-05-09 16:55:17 +00004500 obj = yaffs_get_equivalent_obj(obj);
William Juul0e8cc8b2007-11-15 11:13:05 +01004501
Charles Manning753ac612012-05-09 16:55:17 +00004502 switch (obj->variant_type) {
William Juul0e8cc8b2007-11-15 11:13:05 +01004503 case YAFFS_OBJECT_TYPE_FILE:
4504 return DT_REG;
4505 break;
4506 case YAFFS_OBJECT_TYPE_DIRECTORY:
4507 return DT_DIR;
4508 break;
4509 case YAFFS_OBJECT_TYPE_SYMLINK:
4510 return DT_LNK;
4511 break;
4512 case YAFFS_OBJECT_TYPE_HARDLINK:
4513 return DT_REG;
4514 break;
4515 case YAFFS_OBJECT_TYPE_SPECIAL:
4516 if (S_ISFIFO(obj->yst_mode))
4517 return DT_FIFO;
4518 if (S_ISCHR(obj->yst_mode))
4519 return DT_CHR;
4520 if (S_ISBLK(obj->yst_mode))
4521 return DT_BLK;
4522 if (S_ISSOCK(obj->yst_mode))
4523 return DT_SOCK;
Charles Manning753ac612012-05-09 16:55:17 +00004524 return DT_REG;
4525 break;
William Juul0e8cc8b2007-11-15 11:13:05 +01004526 default:
4527 return DT_REG;
4528 break;
4529 }
4530}
4531
Charles Manning753ac612012-05-09 16:55:17 +00004532YCHAR *yaffs_get_symlink_alias(struct yaffs_obj *obj)
William Juul0e8cc8b2007-11-15 11:13:05 +01004533{
Charles Manning753ac612012-05-09 16:55:17 +00004534 obj = yaffs_get_equivalent_obj(obj);
4535 if (obj->variant_type == YAFFS_OBJECT_TYPE_SYMLINK)
4536 return yaffs_clone_str(obj->variant.symlink_variant.alias);
4537 else
4538 return yaffs_clone_str(_Y(""));
William Juul0e8cc8b2007-11-15 11:13:05 +01004539}
4540
Charles Manning753ac612012-05-09 16:55:17 +00004541/*--------------------------- Initialisation code -------------------------- */
William Juul0e8cc8b2007-11-15 11:13:05 +01004542
Charles Manning753ac612012-05-09 16:55:17 +00004543static int yaffs_check_dev_fns(const struct yaffs_dev *dev)
William Juul0e8cc8b2007-11-15 11:13:05 +01004544{
William Juul0e8cc8b2007-11-15 11:13:05 +01004545 /* Common functions, gotta have */
Charles Manning753ac612012-05-09 16:55:17 +00004546 if (!dev->param.erase_fn || !dev->param.initialise_flash_fn)
William Juul0e8cc8b2007-11-15 11:13:05 +01004547 return 0;
4548
William Juul0e8cc8b2007-11-15 11:13:05 +01004549 /* Can use the "with tags" style interface for yaffs1 or yaffs2 */
Charles Manning753ac612012-05-09 16:55:17 +00004550 if (dev->param.write_chunk_tags_fn &&
4551 dev->param.read_chunk_tags_fn &&
4552 !dev->param.write_chunk_fn &&
4553 !dev->param.read_chunk_fn &&
4554 dev->param.bad_block_fn && dev->param.query_block_fn)
William Juul0e8cc8b2007-11-15 11:13:05 +01004555 return 1;
William Juul0e8cc8b2007-11-15 11:13:05 +01004556
4557 /* Can use the "spare" style interface for yaffs1 */
Charles Manning753ac612012-05-09 16:55:17 +00004558 if (!dev->param.is_yaffs2 &&
4559 !dev->param.write_chunk_tags_fn &&
4560 !dev->param.read_chunk_tags_fn &&
4561 dev->param.write_chunk_fn &&
4562 dev->param.read_chunk_fn &&
4563 !dev->param.bad_block_fn && !dev->param.query_block_fn)
William Juul0e8cc8b2007-11-15 11:13:05 +01004564 return 1;
4565
4566 return 0; /* bad */
4567}
4568
Charles Manning753ac612012-05-09 16:55:17 +00004569static int yaffs_create_initial_dir(struct yaffs_dev *dev)
William Juul0e8cc8b2007-11-15 11:13:05 +01004570{
Charles Manning753ac612012-05-09 16:55:17 +00004571 /* Initialise the unlinked, deleted, root and lost+found directories */
4572 dev->lost_n_found = dev->root_dir = NULL;
4573 dev->unlinked_dir = dev->del_dir = NULL;
4574 dev->unlinked_dir =
4575 yaffs_create_fake_dir(dev, YAFFS_OBJECTID_UNLINKED, S_IFDIR);
4576 dev->del_dir =
4577 yaffs_create_fake_dir(dev, YAFFS_OBJECTID_DELETED, S_IFDIR);
4578 dev->root_dir =
4579 yaffs_create_fake_dir(dev, YAFFS_OBJECTID_ROOT,
4580 YAFFS_ROOT_MODE | S_IFDIR);
4581 dev->lost_n_found =
4582 yaffs_create_fake_dir(dev, YAFFS_OBJECTID_LOSTNFOUND,
4583 YAFFS_LOSTNFOUND_MODE | S_IFDIR);
Wolfgang Denk4b070802008-08-14 14:41:06 +02004584
Charles Manning753ac612012-05-09 16:55:17 +00004585 if (dev->lost_n_found && dev->root_dir && dev->unlinked_dir
4586 && dev->del_dir) {
4587 yaffs_add_obj_to_dir(dev->root_dir, dev->lost_n_found);
William Juul0e8cc8b2007-11-15 11:13:05 +01004588 return YAFFS_OK;
4589 }
William Juul0e8cc8b2007-11-15 11:13:05 +01004590 return YAFFS_FAIL;
4591}
4592
Charles Manning753ac612012-05-09 16:55:17 +00004593int yaffs_guts_initialise(struct yaffs_dev *dev)
William Juul0e8cc8b2007-11-15 11:13:05 +01004594{
4595 int init_failed = 0;
4596 unsigned x;
4597 int bits;
4598
Charles Manning753ac612012-05-09 16:55:17 +00004599 yaffs_trace(YAFFS_TRACE_TRACING, "yaffs: yaffs_guts_initialise()");
William Juul0e8cc8b2007-11-15 11:13:05 +01004600
4601 /* Check stuff that must be set */
4602
4603 if (!dev) {
Charles Manning753ac612012-05-09 16:55:17 +00004604 yaffs_trace(YAFFS_TRACE_ALWAYS,
4605 "yaffs: Need a device"
4606 );
William Juul0e8cc8b2007-11-15 11:13:05 +01004607 return YAFFS_FAIL;
4608 }
4609
Charles Manning753ac612012-05-09 16:55:17 +00004610 if (dev->is_mounted) {
4611 yaffs_trace(YAFFS_TRACE_ALWAYS, "device already mounted");
4612 return YAFFS_FAIL;
4613 }
William Juul0e8cc8b2007-11-15 11:13:05 +01004614
Charles Manning753ac612012-05-09 16:55:17 +00004615 dev->internal_start_block = dev->param.start_block;
4616 dev->internal_end_block = dev->param.end_block;
4617 dev->block_offset = 0;
4618 dev->chunk_offset = 0;
4619 dev->n_free_chunks = 0;
4620
4621 dev->gc_block = 0;
4622
4623 if (dev->param.start_block == 0) {
4624 dev->internal_start_block = dev->param.start_block + 1;
4625 dev->internal_end_block = dev->param.end_block + 1;
4626 dev->block_offset = 1;
4627 dev->chunk_offset = dev->param.chunks_per_block;
William Juul0e8cc8b2007-11-15 11:13:05 +01004628 }
4629
4630 /* Check geometry parameters. */
4631
Charles Manning753ac612012-05-09 16:55:17 +00004632 if ((!dev->param.inband_tags && dev->param.is_yaffs2 &&
4633 dev->param.total_bytes_per_chunk < 1024) ||
4634 (!dev->param.is_yaffs2 &&
4635 dev->param.total_bytes_per_chunk < 512) ||
4636 (dev->param.inband_tags && !dev->param.is_yaffs2) ||
4637 dev->param.chunks_per_block < 2 ||
4638 dev->param.n_reserved_blocks < 2 ||
4639 dev->internal_start_block <= 0 ||
4640 dev->internal_end_block <= 0 ||
4641 dev->internal_end_block <=
4642 (dev->internal_start_block + dev->param.n_reserved_blocks + 2)
4643 ) {
4644 /* otherwise it is too small */
4645 yaffs_trace(YAFFS_TRACE_ALWAYS,
4646 "NAND geometry problems: chunk size %d, type is yaffs%s, inband_tags %d ",
4647 dev->param.total_bytes_per_chunk,
4648 dev->param.is_yaffs2 ? "2" : "",
4649 dev->param.inband_tags);
William Juul0e8cc8b2007-11-15 11:13:05 +01004650 return YAFFS_FAIL;
4651 }
4652
Charles Manning753ac612012-05-09 16:55:17 +00004653 if (yaffs_init_nand(dev) != YAFFS_OK) {
4654 yaffs_trace(YAFFS_TRACE_ALWAYS, "InitialiseNAND failed");
William Juul0e8cc8b2007-11-15 11:13:05 +01004655 return YAFFS_FAIL;
4656 }
4657
Charles Manning753ac612012-05-09 16:55:17 +00004658 /* Sort out space for inband tags, if required */
4659 if (dev->param.inband_tags)
4660 dev->data_bytes_per_chunk =
4661 dev->param.total_bytes_per_chunk -
4662 sizeof(struct yaffs_packed_tags2_tags_only);
4663 else
4664 dev->data_bytes_per_chunk = dev->param.total_bytes_per_chunk;
4665
William Juul0e8cc8b2007-11-15 11:13:05 +01004666 /* Got the right mix of functions? */
Charles Manning753ac612012-05-09 16:55:17 +00004667 if (!yaffs_check_dev_fns(dev)) {
William Juul0e8cc8b2007-11-15 11:13:05 +01004668 /* Function missing */
Charles Manning753ac612012-05-09 16:55:17 +00004669 yaffs_trace(YAFFS_TRACE_ALWAYS,
4670 "device function(s) missing or wrong");
William Juul0e8cc8b2007-11-15 11:13:05 +01004671
4672 return YAFFS_FAIL;
4673 }
4674
Charles Manning753ac612012-05-09 16:55:17 +00004675 /* Finished with most checks. Further checks happen later on too. */
William Juul0e8cc8b2007-11-15 11:13:05 +01004676
Charles Manning753ac612012-05-09 16:55:17 +00004677 dev->is_mounted = 1;
William Juul0e8cc8b2007-11-15 11:13:05 +01004678
4679 /* OK now calculate a few things for the device */
Wolfgang Denk4b070802008-08-14 14:41:06 +02004680
William Juul0e8cc8b2007-11-15 11:13:05 +01004681 /*
Wolfgang Denk4b070802008-08-14 14:41:06 +02004682 * Calculate all the chunk size manipulation numbers:
William Juul0e8cc8b2007-11-15 11:13:05 +01004683 */
Charles Manning753ac612012-05-09 16:55:17 +00004684 x = dev->data_bytes_per_chunk;
4685 /* We always use dev->chunk_shift and dev->chunk_div */
4686 dev->chunk_shift = calc_shifts(x);
4687 x >>= dev->chunk_shift;
4688 dev->chunk_div = x;
4689 /* We only use chunk mask if chunk_div is 1 */
4690 dev->chunk_mask = (1 << dev->chunk_shift) - 1;
William Juul0e8cc8b2007-11-15 11:13:05 +01004691
4692 /*
Charles Manning753ac612012-05-09 16:55:17 +00004693 * Calculate chunk_grp_bits.
4694 * We need to find the next power of 2 > than internal_end_block
William Juul0e8cc8b2007-11-15 11:13:05 +01004695 */
4696
Charles Manning753ac612012-05-09 16:55:17 +00004697 x = dev->param.chunks_per_block * (dev->internal_end_block + 1);
Wolfgang Denk4b070802008-08-14 14:41:06 +02004698
Charles Manning753ac612012-05-09 16:55:17 +00004699 bits = calc_shifts_ceiling(x);
Wolfgang Denk4b070802008-08-14 14:41:06 +02004700
William Juul0e8cc8b2007-11-15 11:13:05 +01004701 /* Set up tnode width if wide tnodes are enabled. */
Charles Manning753ac612012-05-09 16:55:17 +00004702 if (!dev->param.wide_tnodes_disabled) {
William Juul0e8cc8b2007-11-15 11:13:05 +01004703 /* bits must be even so that we end up with 32-bit words */
Charles Manning753ac612012-05-09 16:55:17 +00004704 if (bits & 1)
William Juul0e8cc8b2007-11-15 11:13:05 +01004705 bits++;
Charles Manning753ac612012-05-09 16:55:17 +00004706 if (bits < 16)
4707 dev->tnode_width = 16;
William Juul0e8cc8b2007-11-15 11:13:05 +01004708 else
Charles Manning753ac612012-05-09 16:55:17 +00004709 dev->tnode_width = bits;
4710 } else {
4711 dev->tnode_width = 16;
William Juul0e8cc8b2007-11-15 11:13:05 +01004712 }
Wolfgang Denk4b070802008-08-14 14:41:06 +02004713
Charles Manning753ac612012-05-09 16:55:17 +00004714 dev->tnode_mask = (1 << dev->tnode_width) - 1;
Wolfgang Denk4b070802008-08-14 14:41:06 +02004715
William Juul0e8cc8b2007-11-15 11:13:05 +01004716 /* Level0 Tnodes are 16 bits or wider (if wide tnodes are enabled),
4717 * so if the bitwidth of the
4718 * chunk range we're using is greater than 16 we need
Charles Manning753ac612012-05-09 16:55:17 +00004719 * to figure out chunk shift and chunk_grp_size
William Juul0e8cc8b2007-11-15 11:13:05 +01004720 */
Wolfgang Denk4b070802008-08-14 14:41:06 +02004721
Charles Manning753ac612012-05-09 16:55:17 +00004722 if (bits <= dev->tnode_width)
4723 dev->chunk_grp_bits = 0;
William Juul0e8cc8b2007-11-15 11:13:05 +01004724 else
Charles Manning753ac612012-05-09 16:55:17 +00004725 dev->chunk_grp_bits = bits - dev->tnode_width;
Wolfgang Denk4b070802008-08-14 14:41:06 +02004726
Charles Manning753ac612012-05-09 16:55:17 +00004727 dev->tnode_size = (dev->tnode_width * YAFFS_NTNODES_LEVEL0) / 8;
4728 if (dev->tnode_size < sizeof(struct yaffs_tnode))
4729 dev->tnode_size = sizeof(struct yaffs_tnode);
William Juul0e8cc8b2007-11-15 11:13:05 +01004730
Charles Manning753ac612012-05-09 16:55:17 +00004731 dev->chunk_grp_size = 1 << dev->chunk_grp_bits;
William Juul0e8cc8b2007-11-15 11:13:05 +01004732
Charles Manning753ac612012-05-09 16:55:17 +00004733 if (dev->param.chunks_per_block < dev->chunk_grp_size) {
William Juul0e8cc8b2007-11-15 11:13:05 +01004734 /* We have a problem because the soft delete won't work if
4735 * the chunk group size > chunks per block.
4736 * This can be remedied by using larger "virtual blocks".
4737 */
Charles Manning753ac612012-05-09 16:55:17 +00004738 yaffs_trace(YAFFS_TRACE_ALWAYS, "chunk group too large");
William Juul0e8cc8b2007-11-15 11:13:05 +01004739
4740 return YAFFS_FAIL;
4741 }
4742
Charles Manning753ac612012-05-09 16:55:17 +00004743 /* Finished verifying the device, continue with initialisation */
William Juul0e8cc8b2007-11-15 11:13:05 +01004744
4745 /* More device initialisation */
Charles Manning753ac612012-05-09 16:55:17 +00004746 dev->all_gcs = 0;
4747 dev->passive_gc_count = 0;
4748 dev->oldest_dirty_gc_count = 0;
4749 dev->bg_gcs = 0;
4750 dev->gc_block_finder = 0;
4751 dev->buffered_block = -1;
4752 dev->doing_buffered_block_rewrite = 0;
4753 dev->n_deleted_files = 0;
4754 dev->n_bg_deletions = 0;
4755 dev->n_unlinked_files = 0;
4756 dev->n_ecc_fixed = 0;
4757 dev->n_ecc_unfixed = 0;
4758 dev->n_tags_ecc_fixed = 0;
4759 dev->n_tags_ecc_unfixed = 0;
4760 dev->n_erase_failures = 0;
4761 dev->n_erased_blocks = 0;
4762 dev->gc_disable = 0;
4763 dev->has_pending_prioritised_gc = 1;
4764 /* Assume the worst for now, will get fixed on first GC */
4765 INIT_LIST_HEAD(&dev->dirty_dirs);
4766 dev->oldest_dirty_seq = 0;
4767 dev->oldest_dirty_block = 0;
William Juul0e8cc8b2007-11-15 11:13:05 +01004768
4769 /* Initialise temporary buffers and caches. */
Charles Manning753ac612012-05-09 16:55:17 +00004770 if (!yaffs_init_tmp_buffers(dev))
William Juul0e8cc8b2007-11-15 11:13:05 +01004771 init_failed = 1;
Wolfgang Denk4b070802008-08-14 14:41:06 +02004772
Charles Manning753ac612012-05-09 16:55:17 +00004773 dev->cache = NULL;
4774 dev->gc_cleanup_list = NULL;
Wolfgang Denk4b070802008-08-14 14:41:06 +02004775
Charles Manning753ac612012-05-09 16:55:17 +00004776 if (!init_failed && dev->param.n_caches > 0) {
William Juul0e8cc8b2007-11-15 11:13:05 +01004777 int i;
Charles Manning753ac612012-05-09 16:55:17 +00004778 void *buf;
4779 int cache_bytes =
4780 dev->param.n_caches * sizeof(struct yaffs_cache);
William Juul0e8cc8b2007-11-15 11:13:05 +01004781
Charles Manning753ac612012-05-09 16:55:17 +00004782 if (dev->param.n_caches > YAFFS_MAX_SHORT_OP_CACHES)
4783 dev->param.n_caches = YAFFS_MAX_SHORT_OP_CACHES;
4784
4785 dev->cache = kmalloc(cache_bytes, GFP_NOFS);
4786
4787 buf = (u8 *) dev->cache;
4788
4789 if (dev->cache)
4790 memset(dev->cache, 0, cache_bytes);
4791
4792 for (i = 0; i < dev->param.n_caches && buf; i++) {
4793 dev->cache[i].object = NULL;
4794 dev->cache[i].last_use = 0;
4795 dev->cache[i].dirty = 0;
4796 dev->cache[i].data = buf =
4797 kmalloc(dev->param.total_bytes_per_chunk, GFP_NOFS);
William Juul0e8cc8b2007-11-15 11:13:05 +01004798 }
Charles Manning753ac612012-05-09 16:55:17 +00004799 if (!buf)
William Juul0e8cc8b2007-11-15 11:13:05 +01004800 init_failed = 1;
Wolfgang Denk4b070802008-08-14 14:41:06 +02004801
Charles Manning753ac612012-05-09 16:55:17 +00004802 dev->cache_last_use = 0;
William Juul0e8cc8b2007-11-15 11:13:05 +01004803 }
4804
Charles Manning753ac612012-05-09 16:55:17 +00004805 dev->cache_hits = 0;
Wolfgang Denk4b070802008-08-14 14:41:06 +02004806
Charles Manning753ac612012-05-09 16:55:17 +00004807 if (!init_failed) {
4808 dev->gc_cleanup_list =
4809 kmalloc(dev->param.chunks_per_block * sizeof(u32),
4810 GFP_NOFS);
4811 if (!dev->gc_cleanup_list)
William Juul0e8cc8b2007-11-15 11:13:05 +01004812 init_failed = 1;
4813 }
4814
Charles Manning753ac612012-05-09 16:55:17 +00004815 if (dev->param.is_yaffs2)
4816 dev->param.use_header_file_size = 1;
4817
4818 if (!init_failed && !yaffs_init_blocks(dev))
William Juul0e8cc8b2007-11-15 11:13:05 +01004819 init_failed = 1;
Wolfgang Denk4b070802008-08-14 14:41:06 +02004820
Charles Manning753ac612012-05-09 16:55:17 +00004821 yaffs_init_tnodes_and_objs(dev);
William Juul0e8cc8b2007-11-15 11:13:05 +01004822
Charles Manning753ac612012-05-09 16:55:17 +00004823 if (!init_failed && !yaffs_create_initial_dir(dev))
William Juul0e8cc8b2007-11-15 11:13:05 +01004824 init_failed = 1;
4825
Charles Manning753ac612012-05-09 16:55:17 +00004826 if (!init_failed && dev->param.is_yaffs2 &&
4827 !dev->param.disable_summary &&
4828 !yaffs_summary_init(dev))
4829 init_failed = 1;
William Juul0e8cc8b2007-11-15 11:13:05 +01004830
Charles Manning753ac612012-05-09 16:55:17 +00004831 if (!init_failed) {
William Juul0e8cc8b2007-11-15 11:13:05 +01004832 /* Now scan the flash. */
Charles Manning753ac612012-05-09 16:55:17 +00004833 if (dev->param.is_yaffs2) {
4834 if (yaffs2_checkpt_restore(dev)) {
4835 yaffs_check_obj_details_loaded(dev->root_dir);
4836 yaffs_trace(YAFFS_TRACE_CHECKPOINT |
4837 YAFFS_TRACE_MOUNT,
4838 "yaffs: restored from checkpoint"
4839 );
William Juul0e8cc8b2007-11-15 11:13:05 +01004840 } else {
4841
Charles Manning753ac612012-05-09 16:55:17 +00004842 /* Clean up the mess caused by an aborted
4843 * checkpoint load then scan backwards.
William Juul0e8cc8b2007-11-15 11:13:05 +01004844 */
Charles Manning753ac612012-05-09 16:55:17 +00004845 yaffs_deinit_blocks(dev);
Wolfgang Denk4b070802008-08-14 14:41:06 +02004846
Charles Manning753ac612012-05-09 16:55:17 +00004847 yaffs_deinit_tnodes_and_objs(dev);
Wolfgang Denk4b070802008-08-14 14:41:06 +02004848
Charles Manning753ac612012-05-09 16:55:17 +00004849 dev->n_erased_blocks = 0;
4850 dev->n_free_chunks = 0;
4851 dev->alloc_block = -1;
4852 dev->alloc_page = -1;
4853 dev->n_deleted_files = 0;
4854 dev->n_unlinked_files = 0;
4855 dev->n_bg_deletions = 0;
William Juul0e8cc8b2007-11-15 11:13:05 +01004856
Charles Manning753ac612012-05-09 16:55:17 +00004857 if (!init_failed && !yaffs_init_blocks(dev))
William Juul0e8cc8b2007-11-15 11:13:05 +01004858 init_failed = 1;
Wolfgang Denk4b070802008-08-14 14:41:06 +02004859
Charles Manning753ac612012-05-09 16:55:17 +00004860 yaffs_init_tnodes_and_objs(dev);
William Juul0e8cc8b2007-11-15 11:13:05 +01004861
Charles Manning753ac612012-05-09 16:55:17 +00004862 if (!init_failed
4863 && !yaffs_create_initial_dir(dev))
William Juul0e8cc8b2007-11-15 11:13:05 +01004864 init_failed = 1;
4865
Charles Manning753ac612012-05-09 16:55:17 +00004866 if (!init_failed && !yaffs2_scan_backwards(dev))
William Juul0e8cc8b2007-11-15 11:13:05 +01004867 init_failed = 1;
4868 }
Charles Manning753ac612012-05-09 16:55:17 +00004869 } else if (!yaffs1_scan(dev)) {
4870 init_failed = 1;
4871 }
4872
4873 yaffs_strip_deleted_objs(dev);
4874 yaffs_fix_hanging_objs(dev);
4875 if (dev->param.empty_lost_n_found)
4876 yaffs_empty_l_n_f(dev);
William Juul0e8cc8b2007-11-15 11:13:05 +01004877 }
Wolfgang Denk4b070802008-08-14 14:41:06 +02004878
Charles Manning753ac612012-05-09 16:55:17 +00004879 if (init_failed) {
William Juul0e8cc8b2007-11-15 11:13:05 +01004880 /* Clean up the mess */
Charles Manning753ac612012-05-09 16:55:17 +00004881 yaffs_trace(YAFFS_TRACE_TRACING,
4882 "yaffs: yaffs_guts_initialise() aborted.");
William Juul0e8cc8b2007-11-15 11:13:05 +01004883
Charles Manning753ac612012-05-09 16:55:17 +00004884 yaffs_deinitialise(dev);
William Juul0e8cc8b2007-11-15 11:13:05 +01004885 return YAFFS_FAIL;
4886 }
4887
4888 /* Zero out stats */
Charles Manning753ac612012-05-09 16:55:17 +00004889 dev->n_page_reads = 0;
4890 dev->n_page_writes = 0;
4891 dev->n_erasures = 0;
4892 dev->n_gc_copies = 0;
4893 dev->n_retried_writes = 0;
William Juul0e8cc8b2007-11-15 11:13:05 +01004894
Charles Manning753ac612012-05-09 16:55:17 +00004895 dev->n_retired_blocks = 0;
William Juul0e8cc8b2007-11-15 11:13:05 +01004896
Charles Manning753ac612012-05-09 16:55:17 +00004897 yaffs_verify_free_chunks(dev);
4898 yaffs_verify_blocks(dev);
Wolfgang Denk4b070802008-08-14 14:41:06 +02004899
Charles Manning753ac612012-05-09 16:55:17 +00004900 /* Clean up any aborted checkpoint data */
4901 if (!dev->is_checkpointed && dev->blocks_in_checkpt > 0)
4902 yaffs2_checkpt_invalidate(dev);
William Juul0e8cc8b2007-11-15 11:13:05 +01004903
Charles Manning753ac612012-05-09 16:55:17 +00004904 yaffs_trace(YAFFS_TRACE_TRACING,
4905 "yaffs: yaffs_guts_initialise() done.");
William Juul0e8cc8b2007-11-15 11:13:05 +01004906 return YAFFS_OK;
William Juul0e8cc8b2007-11-15 11:13:05 +01004907}
4908
Charles Manning753ac612012-05-09 16:55:17 +00004909void yaffs_deinitialise(struct yaffs_dev *dev)
William Juul0e8cc8b2007-11-15 11:13:05 +01004910{
Charles Manning753ac612012-05-09 16:55:17 +00004911 if (dev->is_mounted) {
William Juul0e8cc8b2007-11-15 11:13:05 +01004912 int i;
4913
Charles Manning753ac612012-05-09 16:55:17 +00004914 yaffs_deinit_blocks(dev);
4915 yaffs_deinit_tnodes_and_objs(dev);
4916 yaffs_summary_deinit(dev);
William Juul0e8cc8b2007-11-15 11:13:05 +01004917
Charles Manning753ac612012-05-09 16:55:17 +00004918 if (dev->param.n_caches > 0 && dev->cache) {
4919
4920 for (i = 0; i < dev->param.n_caches; i++) {
4921 kfree(dev->cache[i].data);
4922 dev->cache[i].data = NULL;
William Juul0e8cc8b2007-11-15 11:13:05 +01004923 }
4924
Charles Manning753ac612012-05-09 16:55:17 +00004925 kfree(dev->cache);
4926 dev->cache = NULL;
William Juul0e8cc8b2007-11-15 11:13:05 +01004927 }
4928
Charles Manning753ac612012-05-09 16:55:17 +00004929 kfree(dev->gc_cleanup_list);
William Juul0e8cc8b2007-11-15 11:13:05 +01004930
Charles Manning753ac612012-05-09 16:55:17 +00004931 for (i = 0; i < YAFFS_N_TEMP_BUFFERS; i++)
4932 kfree(dev->temp_buffer[i].buffer);
William Juul0e8cc8b2007-11-15 11:13:05 +01004933
Charles Manning753ac612012-05-09 16:55:17 +00004934 dev->is_mounted = 0;
4935
4936 if (dev->param.deinitialise_flash_fn)
4937 dev->param.deinitialise_flash_fn(dev);
William Juul0e8cc8b2007-11-15 11:13:05 +01004938 }
William Juul0e8cc8b2007-11-15 11:13:05 +01004939}
4940
Charles Manning753ac612012-05-09 16:55:17 +00004941int yaffs_count_free_chunks(struct yaffs_dev *dev)
William Juul0e8cc8b2007-11-15 11:13:05 +01004942{
Charles Manning753ac612012-05-09 16:55:17 +00004943 int n_free = 0;
William Juul0e8cc8b2007-11-15 11:13:05 +01004944 int b;
Charles Manning753ac612012-05-09 16:55:17 +00004945 struct yaffs_block_info *blk;
William Juul0e8cc8b2007-11-15 11:13:05 +01004946
Charles Manning753ac612012-05-09 16:55:17 +00004947 blk = dev->block_info;
4948 for (b = dev->internal_start_block; b <= dev->internal_end_block; b++) {
4949 switch (blk->block_state) {
William Juul0e8cc8b2007-11-15 11:13:05 +01004950 case YAFFS_BLOCK_STATE_EMPTY:
4951 case YAFFS_BLOCK_STATE_ALLOCATING:
4952 case YAFFS_BLOCK_STATE_COLLECTING:
4953 case YAFFS_BLOCK_STATE_FULL:
Charles Manning753ac612012-05-09 16:55:17 +00004954 n_free +=
4955 (dev->param.chunks_per_block - blk->pages_in_use +
4956 blk->soft_del_pages);
William Juul0e8cc8b2007-11-15 11:13:05 +01004957 break;
4958 default:
4959 break;
4960 }
Charles Manning753ac612012-05-09 16:55:17 +00004961 blk++;
William Juul0e8cc8b2007-11-15 11:13:05 +01004962 }
Charles Manning753ac612012-05-09 16:55:17 +00004963 return n_free;
William Juul0e8cc8b2007-11-15 11:13:05 +01004964}
4965
Charles Manning753ac612012-05-09 16:55:17 +00004966int yaffs_get_n_free_chunks(struct yaffs_dev *dev)
William Juul0e8cc8b2007-11-15 11:13:05 +01004967{
4968 /* This is what we report to the outside world */
Charles Manning753ac612012-05-09 16:55:17 +00004969 int n_free;
4970 int n_dirty_caches;
4971 int blocks_for_checkpt;
4972 int i;
William Juul0e8cc8b2007-11-15 11:13:05 +01004973
Charles Manning753ac612012-05-09 16:55:17 +00004974 n_free = dev->n_free_chunks;
4975 n_free += dev->n_deleted_files;
William Juul0e8cc8b2007-11-15 11:13:05 +01004976
Charles Manning753ac612012-05-09 16:55:17 +00004977 /* Now count and subtract the number of dirty chunks in the cache. */
William Juul0e8cc8b2007-11-15 11:13:05 +01004978
Charles Manning753ac612012-05-09 16:55:17 +00004979 for (n_dirty_caches = 0, i = 0; i < dev->param.n_caches; i++) {
4980 if (dev->cache[i].dirty)
4981 n_dirty_caches++;
William Juul0e8cc8b2007-11-15 11:13:05 +01004982 }
4983
Charles Manning753ac612012-05-09 16:55:17 +00004984 n_free -= n_dirty_caches;
William Juul0e8cc8b2007-11-15 11:13:05 +01004985
Charles Manning753ac612012-05-09 16:55:17 +00004986 n_free -=
4987 ((dev->param.n_reserved_blocks + 1) * dev->param.chunks_per_block);
Wolfgang Denk4b070802008-08-14 14:41:06 +02004988
Charles Manning753ac612012-05-09 16:55:17 +00004989 /* Now figure checkpoint space and report that... */
4990 blocks_for_checkpt = yaffs_calc_checkpt_blocks_required(dev);
Wolfgang Denk4b070802008-08-14 14:41:06 +02004991
Charles Manning753ac612012-05-09 16:55:17 +00004992 n_free -= (blocks_for_checkpt * dev->param.chunks_per_block);
William Juul0e8cc8b2007-11-15 11:13:05 +01004993
Charles Manning753ac612012-05-09 16:55:17 +00004994 if (n_free < 0)
4995 n_free = 0;
William Juul0e8cc8b2007-11-15 11:13:05 +01004996
Charles Manning753ac612012-05-09 16:55:17 +00004997 return n_free;
William Juul0e8cc8b2007-11-15 11:13:05 +01004998}
4999
Charles Manning753ac612012-05-09 16:55:17 +00005000/*\
5001 * Marshalling functions to get loff_t file sizes into aand out of
5002 * object headers.
5003 */
5004void yaffs_oh_size_load(struct yaffs_obj_hdr *oh, loff_t fsize)
William Juul0e8cc8b2007-11-15 11:13:05 +01005005{
Charles Manning753ac612012-05-09 16:55:17 +00005006 oh->file_size_low = (fsize & 0xFFFFFFFF);
5007 oh->file_size_high = ((fsize >> 32) & 0xFFFFFFFF);
William Juul0e8cc8b2007-11-15 11:13:05 +01005008}
5009
Charles Manning753ac612012-05-09 16:55:17 +00005010loff_t yaffs_oh_to_size(struct yaffs_obj_hdr *oh)
William Juul0e8cc8b2007-11-15 11:13:05 +01005011{
Charles Manning753ac612012-05-09 16:55:17 +00005012 loff_t retval;
William Juul0e8cc8b2007-11-15 11:13:05 +01005013
Charles Manning753ac612012-05-09 16:55:17 +00005014 if (~(oh->file_size_high))
5015 retval = (((loff_t) oh->file_size_high) << 32) |
5016 (((loff_t) oh->file_size_low) & 0xFFFFFFFF);
5017 else
5018 retval = (loff_t) oh->file_size_low;
5019
5020 return retval;
William Juul0e8cc8b2007-11-15 11:13:05 +01005021}