fs: btrfs: Add U-Boot fs handlers.
Signed-off-by: Marek Behun <marek.behun@nic.cz>
create mode 100644 fs/btrfs/Kconfig
create mode 100644 fs/btrfs/Makefile
create mode 100644 fs/btrfs/btrfs.c
create mode 100644 include/btrfs.h
diff --git a/fs/btrfs/Kconfig b/fs/btrfs/Kconfig
new file mode 100644
index 0000000..22909d9
--- /dev/null
+++ b/fs/btrfs/Kconfig
@@ -0,0 +1,9 @@
+config FS_BTRFS
+ bool "Enable BTRFS filesystem support"
+ select CRC32C
+ select LZO
+ select RBTREE
+ help
+ This provides a single-device read-only BTRFS support. BTRFS is a
+ next-generation Linux file system based on the copy-on-write
+ principle.
diff --git a/fs/btrfs/Makefile b/fs/btrfs/Makefile
new file mode 100644
index 0000000..0173155
--- /dev/null
+++ b/fs/btrfs/Makefile
@@ -0,0 +1,8 @@
+#
+# 2017 Marek Behun, CZ.NIC, marek.behun@nic.cz
+#
+# SPDX-License-Identifier: GPL-2.0+
+#
+
+obj-y := btrfs.o chunk-map.o compression.o ctree.o dev.o dir-item.o \
+ extent-io.o hash.o inode.o root.o subvolume.o super.o
diff --git a/fs/btrfs/btrfs.c b/fs/btrfs/btrfs.c
new file mode 100644
index 0000000..4140e2b
--- /dev/null
+++ b/fs/btrfs/btrfs.c
@@ -0,0 +1,227 @@
+/*
+ * BTRFS filesystem implementation for U-Boot
+ *
+ * 2017 Marek Behun, CZ.NIC, marek.behun@nic.cz
+ *
+ * SPDX-License-Identifier: GPL-2.0+
+ */
+
+#include "btrfs.h"
+#include <config.h>
+#include <malloc.h>
+#include <linux/time.h>
+
+struct btrfs_info btrfs_info;
+
+static int readdir_callback(const struct btrfs_root *root,
+ struct btrfs_dir_item *item)
+{
+ static const char typestr[BTRFS_FT_MAX][4] = {
+ [BTRFS_FT_UNKNOWN] = " ? ",
+ [BTRFS_FT_REG_FILE] = " ",
+ [BTRFS_FT_DIR] = "DIR",
+ [BTRFS_FT_CHRDEV] = "CHR",
+ [BTRFS_FT_BLKDEV] = "BLK",
+ [BTRFS_FT_FIFO] = "FIF",
+ [BTRFS_FT_SOCK] = "SCK",
+ [BTRFS_FT_SYMLINK] = "SYM",
+ [BTRFS_FT_XATTR] = " ? ",
+ };
+ struct btrfs_inode_item inode;
+ const char *name = (const char *) (item + 1);
+ char filetime[32], *target = NULL;
+ time_t mtime;
+
+ if (btrfs_lookup_inode(root, &item->location, &inode, NULL)) {
+ printf("%s: Cannot find inode item for directory entry %.*s!\n",
+ __func__, item->name_len, name);
+ return 0;
+ }
+
+ mtime = inode.mtime.sec;
+ ctime_r(&mtime, filetime);
+
+ if (item->type == BTRFS_FT_SYMLINK) {
+ target = malloc(min(inode.size + 1,
+ (u64) btrfs_info.sb.sectorsize));
+
+ if (target && btrfs_readlink(root, item->location.objectid,
+ target)) {
+ free(target);
+ target = NULL;
+ }
+
+ if (!target)
+ printf("%s: Cannot read symlink target!\n", __func__);
+ }
+
+ printf("<%s> ", typestr[item->type]);
+ if (item->type == BTRFS_FT_CHRDEV || item->type == BTRFS_FT_BLKDEV)
+ printf("%4u,%5u ", (unsigned int) (inode.rdev >> 20),
+ (unsigned int) (inode.rdev & 0xfffff));
+ else
+ printf("%10llu ", inode.size);
+
+ printf("%24.24s %.*s", filetime, item->name_len, name);
+
+ if (item->type == BTRFS_FT_SYMLINK) {
+ printf(" -> %s", target ? target : "?");
+ if (target)
+ free(target);
+ }
+
+ printf("\n");
+
+ return 0;
+}
+
+int btrfs_probe(struct blk_desc *fs_dev_desc, disk_partition_t *fs_partition)
+{
+ btrfs_blk_desc = fs_dev_desc;
+ btrfs_part_info = fs_partition;
+
+ memset(&btrfs_info, 0, sizeof(btrfs_info));
+
+ btrfs_hash_init();
+ if (btrfs_read_superblock())
+ return -1;
+
+ if (btrfs_chunk_map_init()) {
+ printf("%s: failed to init chunk map\n", __func__);
+ return -1;
+ }
+
+ btrfs_info.tree_root.objectid = 0;
+ btrfs_info.tree_root.bytenr = btrfs_info.sb.root;
+ btrfs_info.chunk_root.objectid = 0;
+ btrfs_info.chunk_root.bytenr = btrfs_info.sb.chunk_root;
+
+ if (btrfs_read_chunk_tree()) {
+ printf("%s: failed to read chunk tree\n", __func__);
+ return -1;
+ }
+
+ if (btrfs_find_root(btrfs_get_default_subvol_objectid(),
+ &btrfs_info.fs_root, NULL)) {
+ printf("%s: failed to find default subvolume\n", __func__);
+ return -1;
+ }
+
+ return 0;
+}
+
+int btrfs_ls(const char *path)
+{
+ struct btrfs_root root = btrfs_info.fs_root;
+ u64 inr;
+ u8 type;
+
+ inr = btrfs_lookup_path(&root, root.root_dirid, path, &type, NULL, 40);
+
+ if (inr == -1ULL) {
+ printf("Cannot lookup path %s\n", path);
+ return 1;
+ }
+
+ if (type != BTRFS_FT_DIR) {
+ printf("Not a directory: %s\n", path);
+ return 1;
+ }
+
+ if (btrfs_readdir(&root, inr, readdir_callback)) {
+ printf("An error occured while listing directory %s\n", path);
+ return 1;
+ }
+
+ return 0;
+}
+
+int btrfs_exists(const char *file)
+{
+ struct btrfs_root root = btrfs_info.fs_root;
+ u64 inr;
+ u8 type;
+
+ inr = btrfs_lookup_path(&root, root.root_dirid, file, &type, NULL, 40);
+
+ return (inr != -1ULL && type == BTRFS_FT_REG_FILE);
+}
+
+int btrfs_size(const char *file, loff_t *size)
+{
+ struct btrfs_root root = btrfs_info.fs_root;
+ struct btrfs_inode_item inode;
+ u64 inr;
+ u8 type;
+
+ inr = btrfs_lookup_path(&root, root.root_dirid, file, &type, &inode,
+ 40);
+
+ if (inr == -1ULL) {
+ printf("Cannot lookup file %s\n", file);
+ return 1;
+ }
+
+ if (type != BTRFS_FT_REG_FILE) {
+ printf("Not a regular file: %s\n", file);
+ return 1;
+ }
+
+ *size = inode.size;
+ return 0;
+}
+
+int btrfs_read(const char *file, void *buf, loff_t offset, loff_t len,
+ loff_t *actread)
+{
+ struct btrfs_root root = btrfs_info.fs_root;
+ struct btrfs_inode_item inode;
+ u64 inr, rd;
+ u8 type;
+
+ inr = btrfs_lookup_path(&root, root.root_dirid, file, &type, &inode,
+ 40);
+
+ if (inr == -1ULL) {
+ printf("Cannot lookup file %s\n", file);
+ return 1;
+ }
+
+ if (type != BTRFS_FT_REG_FILE) {
+ printf("Not a regular file: %s\n", file);
+ return 1;
+ }
+
+ if (!len)
+ len = inode.size;
+
+ if (len > inode.size - offset)
+ len = inode.size - offset;
+
+ rd = btrfs_file_read(&root, inr, offset, len, buf);
+ if (rd == -1ULL) {
+ printf("An error occured while reading file %s\n", file);
+ return 1;
+ }
+
+ *actread = rd;
+ return 0;
+}
+
+void btrfs_close(void)
+{
+ btrfs_chunk_map_exit();
+}
+
+int btrfs_uuid(char *uuid_str)
+{
+#ifdef CONFIG_LIB_UUID
+ uuid_bin_to_str(btrfs_info.sb.fsid, uuid_str, UUID_STR_FORMAT_STD);
+ return 0;
+#endif
+ return -ENOSYS;
+}
+
+/*
+ btrfs_list_subvols();
+*/