diff options
| -rw-r--r-- | fs/btrfs/inode.c | 191 | ||||
| -rw-r--r-- | fs/btrfs/relocation.c | 16 | ||||
| -rw-r--r-- | fs/btrfs/relocation.h | 1 |
3 files changed, 208 insertions, 0 deletions
diff --git a/fs/btrfs/inode.c b/fs/btrfs/inode.c index 675b20c4d3c9..da7e5bf2f6db 100644 --- a/fs/btrfs/inode.c +++ b/fs/btrfs/inode.c @@ -70,6 +70,7 @@ #include "verity.h" #include "super.h" #include "orphan.h" +#include "backref.h" struct btrfs_iget_args { u64 ino; @@ -100,6 +101,18 @@ struct btrfs_rename_ctx { u64 index; }; +/* + * Used by data_reloc_print_warning_inode() to pass needed info for filename + * resolution and output of error message. + */ +struct data_reloc_warn { + struct btrfs_path path; + struct btrfs_fs_info *fs_info; + u64 extent_item_size; + u64 logical; + int mirror_num; +}; + static const struct inode_operations btrfs_dir_inode_operations; static const struct inode_operations btrfs_symlink_inode_operations; static const struct inode_operations btrfs_special_inode_operations; @@ -122,12 +135,190 @@ static struct extent_map *create_io_em(struct btrfs_inode *inode, u64 start, u64 ram_bytes, int compress_type, int type); +static int data_reloc_print_warning_inode(u64 inum, u64 offset, u64 num_bytes, + u64 root, void *warn_ctx) +{ + struct data_reloc_warn *warn = warn_ctx; + struct btrfs_fs_info *fs_info = warn->fs_info; + struct extent_buffer *eb; + struct btrfs_inode_item *inode_item; + struct inode_fs_paths *ipath = NULL; + struct btrfs_root *local_root; + struct btrfs_key key; + unsigned int nofs_flag; + u32 nlink; + int ret; + + local_root = btrfs_get_fs_root(fs_info, root, true); + if (IS_ERR(local_root)) { + ret = PTR_ERR(local_root); + goto err; + } + + /* This makes the path point to (inum INODE_ITEM ioff). */ + key.objectid = inum; + key.type = BTRFS_INODE_ITEM_KEY; + key.offset = 0; + + ret = btrfs_search_slot(NULL, local_root, &key, &warn->path, 0, 0); + if (ret) { + btrfs_put_root(local_root); + btrfs_release_path(&warn->path); + goto err; + } + + eb = warn->path.nodes[0]; + inode_item = btrfs_item_ptr(eb, warn->path.slots[0], struct btrfs_inode_item); + nlink = btrfs_inode_nlink(eb, inode_item); + btrfs_release_path(&warn->path); + + nofs_flag = memalloc_nofs_save(); + ipath = init_ipath(4096, local_root, &warn->path); + memalloc_nofs_restore(nofs_flag); + if (IS_ERR(ipath)) { + btrfs_put_root(local_root); + ret = PTR_ERR(ipath); + ipath = NULL; + /* + * -ENOMEM, not a critical error, just output an generic error + * without filename. + */ + btrfs_warn(fs_info, +"checksum error at logical %llu mirror %u root %llu, inode %llu offset %llu", + warn->logical, warn->mirror_num, root, inum, offset); + return ret; + } + ret = paths_from_inode(inum, ipath); + if (ret < 0) + goto err; + + /* + * We deliberately ignore the bit ipath might have been too small to + * hold all of the paths here + */ + for (int i = 0; i < ipath->fspath->elem_cnt; i++) { + btrfs_warn(fs_info, +"checksum error at logical %llu mirror %u root %llu inode %llu offset %llu length %u links %u (path: %s)", + warn->logical, warn->mirror_num, root, inum, offset, + fs_info->sectorsize, nlink, + (char *)(unsigned long)ipath->fspath->val[i]); + } + + btrfs_put_root(local_root); + free_ipath(ipath); + return 0; + +err: + btrfs_warn(fs_info, +"checksum error at logical %llu mirror %u root %llu inode %llu offset %llu, path resolving failed with ret=%d", + warn->logical, warn->mirror_num, root, inum, offset, ret); + + free_ipath(ipath); + return ret; +} + +/* + * Do extra user-friendly error output (e.g. lookup all the affected files). + * + * Return true if we succeeded doing the backref lookup. + * Return false if such lookup failed, and has to fallback to the old error message. + */ +static void print_data_reloc_error(const struct btrfs_inode *inode, u64 file_off, + const u8 *csum, const u8 *csum_expected, + int mirror_num) +{ + struct btrfs_fs_info *fs_info = inode->root->fs_info; + struct btrfs_path path = { 0 }; + struct btrfs_key found_key = { 0 }; + struct extent_buffer *eb; + struct btrfs_extent_item *ei; + const u32 csum_size = fs_info->csum_size; + u64 logical; + u64 flags; + u32 item_size; + int ret; + + mutex_lock(&fs_info->reloc_mutex); + logical = btrfs_get_reloc_bg_bytenr(fs_info); + mutex_unlock(&fs_info->reloc_mutex); + + if (logical == U64_MAX) { + btrfs_warn_rl(fs_info, "has data reloc tree but no running relocation"); + btrfs_warn_rl(fs_info, +"csum failed root %lld ino %llu off %llu csum " CSUM_FMT " expected csum " CSUM_FMT " mirror %d", + inode->root->root_key.objectid, btrfs_ino(inode), file_off, + CSUM_FMT_VALUE(csum_size, csum), + CSUM_FMT_VALUE(csum_size, csum_expected), + mirror_num); + return; + } + + logical += file_off; + btrfs_warn_rl(fs_info, +"csum failed root %lld ino %llu off %llu logical %llu csum " CSUM_FMT " expected csum " CSUM_FMT " mirror %d", + inode->root->root_key.objectid, + btrfs_ino(inode), file_off, logical, + CSUM_FMT_VALUE(csum_size, csum), + CSUM_FMT_VALUE(csum_size, csum_expected), + mirror_num); + + ret = extent_from_logical(fs_info, logical, &path, &found_key, &flags); + if (ret < 0) { + btrfs_err_rl(fs_info, "failed to lookup extent item for logical %llu: %d", + logical, ret); + return; + } + eb = path.nodes[0]; + ei = btrfs_item_ptr(eb, path.slots[0], struct btrfs_extent_item); + item_size = btrfs_item_size(eb, path.slots[0]); + if (flags & BTRFS_EXTENT_FLAG_TREE_BLOCK) { + unsigned long ptr = 0; + u64 ref_root; + u8 ref_level; + + do { + ret = tree_backref_for_extent(&ptr, eb, &found_key, ei, + item_size, &ref_root, + &ref_level); + btrfs_warn_rl(fs_info, +"csum error at logical %llu mirror %u: metadata %s (level %d) in tree %llu", + logical, mirror_num, + (ref_level ? "node" : "leaf"), + (ret < 0 ? -1 : ref_level), + (ret < 0 ? -1 : ref_root)); + } while (ret != 1); + btrfs_release_path(&path); + } else { + struct btrfs_backref_walk_ctx ctx = { 0 }; + struct data_reloc_warn reloc_warn = { 0 }; + + btrfs_release_path(&path); + + ctx.bytenr = found_key.objectid; + ctx.extent_item_pos = logical - found_key.objectid; + ctx.fs_info = fs_info; + + reloc_warn.logical = logical; + reloc_warn.extent_item_size = found_key.offset; + reloc_warn.mirror_num = mirror_num; + reloc_warn.fs_info = fs_info; + + iterate_extent_inodes(&ctx, true, + data_reloc_print_warning_inode, &reloc_warn); + } +} + static void __cold btrfs_print_data_csum_error(struct btrfs_inode *inode, u64 logical_start, u8 *csum, u8 *csum_expected, int mirror_num) { struct btrfs_root *root = inode->root; const u32 csum_size = root->fs_info->csum_size; + /* For data reloc tree, it's better to do a backref lookup instead. */ + if (root->root_key.objectid == BTRFS_DATA_RELOC_TREE_OBJECTID) + return print_data_reloc_error(inode, logical_start, csum, + csum_expected, mirror_num); + /* Output without objectid, which is more meaningful */ if (root->root_key.objectid >= BTRFS_LAST_FREE_OBJECTID) { btrfs_warn_rl(root->fs_info, diff --git a/fs/btrfs/relocation.c b/fs/btrfs/relocation.c index 59a06499c647..38cfbd38a819 100644 --- a/fs/btrfs/relocation.c +++ b/fs/btrfs/relocation.c @@ -4523,3 +4523,19 @@ int btrfs_reloc_post_snapshot(struct btrfs_trans_handle *trans, ret = clone_backref_node(trans, rc, root, reloc_root); return ret; } + +/* + * Get the current bytenr for the block group which is being relocated. + * + * Return U64_MAX if no running relocation. + */ +u64 btrfs_get_reloc_bg_bytenr(struct btrfs_fs_info *fs_info) +{ + u64 logical = U64_MAX; + + lockdep_assert_held(&fs_info->reloc_mutex); + + if (fs_info->reloc_ctl && fs_info->reloc_ctl->block_group) + logical = fs_info->reloc_ctl->block_group->start; + return logical; +} diff --git a/fs/btrfs/relocation.h b/fs/btrfs/relocation.h index 2041a86186de..57cbac5c8ddd 100644 --- a/fs/btrfs/relocation.h +++ b/fs/btrfs/relocation.h @@ -19,5 +19,6 @@ int btrfs_reloc_post_snapshot(struct btrfs_trans_handle *trans, int btrfs_should_cancel_balance(struct btrfs_fs_info *fs_info); struct btrfs_root *find_reloc_root(struct btrfs_fs_info *fs_info, u64 bytenr); int btrfs_should_ignore_reloc_root(struct btrfs_root *root); +u64 btrfs_get_reloc_bg_bytenr(struct btrfs_fs_info *fs_info); #endif |