diff options
author | Qu Wenruo <wqu@suse.com> | 2020-06-24 19:03:01 +0300 |
---|---|---|
committer | Tom Rini <trini@konsulko.com> | 2020-09-08 03:57:27 +0300 |
commit | f06bfcf54d0e91892fcd1379e04aae9cd031fc78 (patch) | |
tree | aac26e518b93db18f3a3557e78340f9ad5483465 /fs/btrfs/disk-io.c | |
parent | 57f24f10733ac57754d4eae3666919480718b032 (diff) | |
download | u-boot-f06bfcf54d0e91892fcd1379e04aae9cd031fc78.tar.xz |
fs: btrfs: Crossport open_ctree_fs_info() from btrfs-progs
open_ctree_fs_info() is the main entry point to open btrfs.
This version is a simplfied version of __open_ctree_fd() of btrfs-progs,
the main differences are:
- Parameters on how to specify a block device
Instead of @fd and @path, U-Boot uses blk_desc and disk_partition_t.
- Remove open_ctree flags
There won't be multiple open ctree modes in U-Boot.
Otherwise functions structures are all kept the same.
With open_ctree_fs_info() implemented, also introduce the global
current_fs_info pointer to show the current opened btrfs.
Signed-off-by: Qu Wenruo <wqu@suse.com>
Reviewed-by: Marek BehĂșn <marek.behun@nic.cz>
Diffstat (limited to 'fs/btrfs/disk-io.c')
-rw-r--r-- | fs/btrfs/disk-io.c | 509 |
1 files changed, 491 insertions, 18 deletions
diff --git a/fs/btrfs/disk-io.c b/fs/btrfs/disk-io.c index 65b4020ebe..4d08b0204a 100644 --- a/fs/btrfs/disk-io.c +++ b/fs/btrfs/disk-io.c @@ -4,6 +4,7 @@ #include <uuid.h> #include <memalign.h> #include "kernel-shared/btrfs_tree.h" +#include "common/rbtree-utils.h" #include "disk-io.h" #include "ctree.h" #include "btrfs.h" @@ -424,24 +425,6 @@ out: } -int btrfs_buffer_uptodate(struct extent_buffer *buf, u64 parent_transid) -{ - int ret; - - ret = extent_buffer_uptodate(buf); - if (!ret) - return ret; - - ret = verify_parent_transid(&buf->fs_info->extent_cache, buf, - parent_transid, 1); - return !ret; -} - -int btrfs_set_buffer_uptodate(struct extent_buffer *eb) -{ - return set_extent_buffer_uptodate(eb); -} - int read_whole_eb(struct btrfs_fs_info *info, struct extent_buffer *eb, int mirror) { unsigned long offset = 0; @@ -581,3 +564,493 @@ struct extent_buffer* read_tree_block(struct btrfs_fs_info *fs_info, u64 bytenr, free_extent_buffer(eb); return ERR_PTR(ret); } + +void btrfs_setup_root(struct btrfs_root *root, struct btrfs_fs_info *fs_info, + u64 objectid) +{ + root->node = NULL; + root->track_dirty = 0; + + root->fs_info = fs_info; + root->objectid = objectid; + root->last_trans = 0; + root->last_inode_alloc = 0; + + memset(&root->root_key, 0, sizeof(root->root_key)); + memset(&root->root_item, 0, sizeof(root->root_item)); + root->root_key.objectid = objectid; +} + +static int find_and_setup_root(struct btrfs_root *tree_root, + struct btrfs_fs_info *fs_info, + u64 objectid, struct btrfs_root *root) +{ + int ret; + u64 generation; + + btrfs_setup_root(root, fs_info, objectid); + ret = btrfs_find_last_root(tree_root, objectid, + &root->root_item, &root->root_key); + if (ret) + return ret; + + generation = btrfs_root_generation(&root->root_item); + root->node = read_tree_block(fs_info, + btrfs_root_bytenr(&root->root_item), generation); + if (!extent_buffer_uptodate(root->node)) + return -EIO; + + return 0; +} + +int btrfs_free_fs_root(struct btrfs_root *root) +{ + if (root->node) + free_extent_buffer(root->node); + kfree(root); + return 0; +} + +static void __free_fs_root(struct rb_node *node) +{ + struct btrfs_root *root; + + root = container_of(node, struct btrfs_root, rb_node); + btrfs_free_fs_root(root); +} + +FREE_RB_BASED_TREE(fs_roots, __free_fs_root); + +struct btrfs_root *btrfs_read_fs_root_no_cache(struct btrfs_fs_info *fs_info, + struct btrfs_key *location) +{ + struct btrfs_root *root; + struct btrfs_root *tree_root = fs_info->tree_root; + struct btrfs_path *path; + struct extent_buffer *l; + u64 generation; + int ret = 0; + + root = calloc(1, sizeof(*root)); + if (!root) + return ERR_PTR(-ENOMEM); + if (location->offset == (u64)-1) { + ret = find_and_setup_root(tree_root, fs_info, + location->objectid, root); + if (ret) { + free(root); + return ERR_PTR(ret); + } + goto insert; + } + + btrfs_setup_root(root, fs_info, + location->objectid); + + path = btrfs_alloc_path(); + if (!path) { + free(root); + return ERR_PTR(-ENOMEM); + } + + ret = btrfs_search_slot(NULL, tree_root, location, path, 0, 0); + if (ret != 0) { + if (ret > 0) + ret = -ENOENT; + goto out; + } + l = path->nodes[0]; + read_extent_buffer(l, &root->root_item, + btrfs_item_ptr_offset(l, path->slots[0]), + sizeof(root->root_item)); + memcpy(&root->root_key, location, sizeof(*location)); + + /* If this root is already an orphan, no need to read */ + if (btrfs_root_refs(&root->root_item) == 0) { + ret = -ENOENT; + goto out; + } + ret = 0; +out: + btrfs_free_path(path); + if (ret) { + free(root); + return ERR_PTR(ret); + } + generation = btrfs_root_generation(&root->root_item); + root->node = read_tree_block(fs_info, + btrfs_root_bytenr(&root->root_item), generation); + if (!extent_buffer_uptodate(root->node)) { + free(root); + return ERR_PTR(-EIO); + } +insert: + root->ref_cows = 1; + return root; +} + +static int btrfs_fs_roots_compare_objectids(struct rb_node *node, + void *data) +{ + u64 objectid = *((u64 *)data); + struct btrfs_root *root; + + root = rb_entry(node, struct btrfs_root, rb_node); + if (objectid > root->objectid) + return 1; + else if (objectid < root->objectid) + return -1; + else + return 0; +} + +int btrfs_fs_roots_compare_roots(struct rb_node *node1, struct rb_node *node2) +{ + struct btrfs_root *root; + + root = rb_entry(node2, struct btrfs_root, rb_node); + return btrfs_fs_roots_compare_objectids(node1, (void *)&root->objectid); +} + +struct btrfs_root *btrfs_read_fs_root(struct btrfs_fs_info *fs_info, + struct btrfs_key *location) +{ + struct btrfs_root *root; + struct rb_node *node; + int ret; + u64 objectid = location->objectid; + + if (location->objectid == BTRFS_ROOT_TREE_OBJECTID) + return fs_info->tree_root; + if (location->objectid == BTRFS_CHUNK_TREE_OBJECTID) + return fs_info->chunk_root; + if (location->objectid == BTRFS_CSUM_TREE_OBJECTID) + return fs_info->csum_root; + BUG_ON(location->objectid == BTRFS_TREE_RELOC_OBJECTID || + location->offset != (u64)-1); + + node = rb_search(&fs_info->fs_root_tree, (void *)&objectid, + btrfs_fs_roots_compare_objectids, NULL); + if (node) + return container_of(node, struct btrfs_root, rb_node); + + root = btrfs_read_fs_root_no_cache(fs_info, location); + if (IS_ERR(root)) + return root; + + ret = rb_insert(&fs_info->fs_root_tree, &root->rb_node, + btrfs_fs_roots_compare_roots); + BUG_ON(ret); + return root; +} + +void btrfs_free_fs_info(struct btrfs_fs_info *fs_info) +{ + free(fs_info->tree_root); + free(fs_info->chunk_root); + free(fs_info->csum_root); + free(fs_info->super_copy); + free(fs_info); +} + +struct btrfs_fs_info *btrfs_new_fs_info(void) +{ + struct btrfs_fs_info *fs_info; + + fs_info = calloc(1, sizeof(struct btrfs_fs_info)); + if (!fs_info) + return NULL; + + fs_info->tree_root = calloc(1, sizeof(struct btrfs_root)); + fs_info->chunk_root = calloc(1, sizeof(struct btrfs_root)); + fs_info->csum_root = calloc(1, sizeof(struct btrfs_root)); + fs_info->super_copy = calloc(1, BTRFS_SUPER_INFO_SIZE); + + if (!fs_info->tree_root || !fs_info->chunk_root || + !fs_info->csum_root || !fs_info->super_copy) + goto free_all; + + extent_io_tree_init(&fs_info->extent_cache); + + fs_info->fs_root_tree = RB_ROOT; + cache_tree_init(&fs_info->mapping_tree.cache_tree); + + mutex_init(&fs_info->fs_mutex); + + return fs_info; +free_all: + btrfs_free_fs_info(fs_info); + return NULL; +} + +static int setup_root_or_create_block(struct btrfs_fs_info *fs_info, + struct btrfs_root *info_root, + u64 objectid, char *str) +{ + struct btrfs_root *root = fs_info->tree_root; + int ret; + + ret = find_and_setup_root(root, fs_info, objectid, info_root); + if (ret) { + error("could not setup %s tree", str); + return -EIO; + } + + return 0; +} + +int btrfs_setup_all_roots(struct btrfs_fs_info *fs_info) +{ + struct btrfs_super_block *sb = fs_info->super_copy; + struct btrfs_root *root; + struct btrfs_key key; + u64 root_tree_bytenr; + u64 generation; + int ret; + + root = fs_info->tree_root; + btrfs_setup_root(root, fs_info, BTRFS_ROOT_TREE_OBJECTID); + generation = btrfs_super_generation(sb); + + root_tree_bytenr = btrfs_super_root(sb); + + root->node = read_tree_block(fs_info, root_tree_bytenr, generation); + if (!extent_buffer_uptodate(root->node)) { + fprintf(stderr, "Couldn't read tree root\n"); + return -EIO; + } + + ret = setup_root_or_create_block(fs_info, fs_info->csum_root, + BTRFS_CSUM_TREE_OBJECTID, "csum"); + if (ret) + return ret; + fs_info->csum_root->track_dirty = 1; + + fs_info->last_trans_committed = generation; + + key.objectid = BTRFS_FS_TREE_OBJECTID; + key.type = BTRFS_ROOT_ITEM_KEY; + key.offset = (u64)-1; + fs_info->fs_root = btrfs_read_fs_root(fs_info, &key); + + if (IS_ERR(fs_info->fs_root)) + return -EIO; + return 0; +} + +void btrfs_release_all_roots(struct btrfs_fs_info *fs_info) +{ + if (fs_info->csum_root) + free_extent_buffer(fs_info->csum_root->node); + if (fs_info->tree_root) + free_extent_buffer(fs_info->tree_root->node); + if (fs_info->chunk_root) + free_extent_buffer(fs_info->chunk_root->node); +} + +static void free_map_lookup(struct cache_extent *ce) +{ + struct map_lookup *map; + + map = container_of(ce, struct map_lookup, ce); + kfree(map); +} + +FREE_EXTENT_CACHE_BASED_TREE(mapping_cache, free_map_lookup); + +void btrfs_cleanup_all_caches(struct btrfs_fs_info *fs_info) +{ + free_mapping_cache_tree(&fs_info->mapping_tree.cache_tree); + extent_io_tree_cleanup(&fs_info->extent_cache); +} + +static int btrfs_scan_fs_devices(struct blk_desc *desc, + struct disk_partition *part, + struct btrfs_fs_devices **fs_devices) +{ + u64 total_devs; + int ret; + + if (round_up(BTRFS_SUPER_INFO_SIZE + BTRFS_SUPER_INFO_OFFSET, + desc->blksz) > (part->size << desc->log2blksz)) { + error("superblock end %u is larger than device size " LBAFU, + BTRFS_SUPER_INFO_SIZE + BTRFS_SUPER_INFO_OFFSET, + part->size << desc->log2blksz); + return -EINVAL; + } + + ret = btrfs_scan_one_device(desc, part, fs_devices, &total_devs); + if (ret) { + fprintf(stderr, "No valid Btrfs found\n"); + return ret; + } + return 0; +} + +int btrfs_check_fs_compatibility(struct btrfs_super_block *sb) +{ + u64 features; + + features = btrfs_super_incompat_flags(sb) & + ~BTRFS_FEATURE_INCOMPAT_SUPP; + if (features) { + printk("couldn't open because of unsupported " + "option features (%llx).\n", + (unsigned long long)features); + return -ENOTSUPP; + } + + features = btrfs_super_incompat_flags(sb); + if (!(features & BTRFS_FEATURE_INCOMPAT_MIXED_BACKREF)) { + features |= BTRFS_FEATURE_INCOMPAT_MIXED_BACKREF; + btrfs_set_super_incompat_flags(sb, features); + } + + return 0; +} + +static int btrfs_setup_chunk_tree_and_device_map(struct btrfs_fs_info *fs_info) +{ + struct btrfs_super_block *sb = fs_info->super_copy; + u64 chunk_root_bytenr; + u64 generation; + int ret; + + btrfs_setup_root(fs_info->chunk_root, fs_info, + BTRFS_CHUNK_TREE_OBJECTID); + + ret = btrfs_read_sys_array(fs_info); + if (ret) + return ret; + + generation = btrfs_super_chunk_root_generation(sb); + chunk_root_bytenr = btrfs_super_chunk_root(sb); + + fs_info->chunk_root->node = read_tree_block(fs_info, + chunk_root_bytenr, + generation); + if (!extent_buffer_uptodate(fs_info->chunk_root->node)) { + error("cannot read chunk root"); + return -EIO; + } + + ret = btrfs_read_chunk_tree(fs_info); + if (ret) { + fprintf(stderr, "Couldn't read chunk tree\n"); + return ret; + } + return 0; +} + +struct btrfs_fs_info *open_ctree_fs_info(struct blk_desc *desc, + struct disk_partition *part) +{ + struct btrfs_fs_info *fs_info; + struct btrfs_super_block *disk_super; + struct btrfs_fs_devices *fs_devices = NULL; + struct extent_buffer *eb; + int ret; + + fs_info = btrfs_new_fs_info(); + if (!fs_info) { + fprintf(stderr, "Failed to allocate memory for fs_info\n"); + return NULL; + } + + ret = btrfs_scan_fs_devices(desc, part, &fs_devices); + if (ret) + goto out; + + fs_info->fs_devices = fs_devices; + + ret = btrfs_open_devices(fs_devices); + if (ret) + goto out; + + disk_super = fs_info->super_copy; + ret = btrfs_read_dev_super(desc, part, disk_super); + if (ret) { + printk("No valid btrfs found\n"); + goto out_devices; + } + + if (btrfs_super_flags(disk_super) & BTRFS_SUPER_FLAG_CHANGING_FSID) { + fprintf(stderr, "ERROR: Filesystem UUID change in progress\n"); + goto out_devices; + } + + ASSERT(!memcmp(disk_super->fsid, fs_devices->fsid, BTRFS_FSID_SIZE)); + if (btrfs_fs_incompat(fs_info, METADATA_UUID)) + ASSERT(!memcmp(disk_super->metadata_uuid, + fs_devices->metadata_uuid, BTRFS_FSID_SIZE)); + + fs_info->sectorsize = btrfs_super_sectorsize(disk_super); + fs_info->nodesize = btrfs_super_nodesize(disk_super); + fs_info->stripesize = btrfs_super_stripesize(disk_super); + + ret = btrfs_check_fs_compatibility(fs_info->super_copy); + if (ret) + goto out_devices; + + ret = btrfs_setup_chunk_tree_and_device_map(fs_info); + if (ret) + goto out_chunk; + + /* Chunk tree root is unable to read, return directly */ + if (!fs_info->chunk_root) + return fs_info; + + eb = fs_info->chunk_root->node; + read_extent_buffer(eb, fs_info->chunk_tree_uuid, + btrfs_header_chunk_tree_uuid(eb), + BTRFS_UUID_SIZE); + + ret = btrfs_setup_all_roots(fs_info); + if (ret) + goto out_chunk; + + return fs_info; + +out_chunk: + btrfs_release_all_roots(fs_info); + btrfs_cleanup_all_caches(fs_info); +out_devices: + btrfs_close_devices(fs_devices); +out: + btrfs_free_fs_info(fs_info); + return NULL; +} + +int close_ctree_fs_info(struct btrfs_fs_info *fs_info) +{ + int ret; + int err = 0; + + free_fs_roots_tree(&fs_info->fs_root_tree); + + btrfs_release_all_roots(fs_info); + ret = btrfs_close_devices(fs_info->fs_devices); + btrfs_cleanup_all_caches(fs_info); + btrfs_free_fs_info(fs_info); + if (!err) + err = ret; + return err; +} + +int btrfs_buffer_uptodate(struct extent_buffer *buf, u64 parent_transid) +{ + int ret; + + ret = extent_buffer_uptodate(buf); + if (!ret) + return ret; + + ret = verify_parent_transid(&buf->fs_info->extent_cache, buf, + parent_transid, 1); + return !ret; +} + +int btrfs_set_buffer_uptodate(struct extent_buffer *eb) +{ + return set_extent_buffer_uptodate(eb); +} |