diff options
| author | Josef Bacik <jbacik@fb.com> | 2014-10-03 10:38:41 -0400 |
|---|---|---|
| committer | David Sterba <dsterba@suse.cz> | 2014-10-14 11:01:35 +0200 |
| commit | 94b2966daf8d3812e4b03da6eca2a5b99302e7ed (patch) | |
| tree | 46efb0abcbfcc891bf3bcd39b5cd3c0a7d7697e4 /btrfs-corrupt-block.c | |
| parent | 3e944ce89462b7b8623ca0019ea6c5beb5df3c47 (diff) | |
btrfs-progs: add shift_items to btrfs-corrupt-block
A user had a corrupted fs where his items where shifted oddly. This adds the
functionality I needed to btrfs-corrupt-block in order to reproduce this
corruption in order to make fsck fix this sort of problem. Thanks,
Signed-off-by: Josef Bacik <jbacik@fb.com>
Signed-off-by: David Sterba <dsterba@suse.cz>
Diffstat (limited to 'btrfs-corrupt-block.c')
| -rw-r--r-- | btrfs-corrupt-block.c | 27 |
1 files changed, 27 insertions, 0 deletions
diff --git a/btrfs-corrupt-block.c b/btrfs-corrupt-block.c index 15f1082a..171c81db 100644 --- a/btrfs-corrupt-block.c +++ b/btrfs-corrupt-block.c @@ -312,6 +312,7 @@ enum btrfs_dir_item_field { enum btrfs_metadata_block_field { BTRFS_METADATA_BLOCK_GENERATION, + BTRFS_METADATA_BLOCK_SHIFT_ITEMS, BTRFS_METADATA_BLOCK_BAD, }; @@ -346,6 +347,8 @@ convert_metadata_block_field(char *field) { if (!strncmp(field, "generation", FIELD_BUF_LEN)) return BTRFS_METADATA_BLOCK_GENERATION; + if (!strncmp(field, "shift_items", FIELD_BUF_LEN)) + return BTRFS_METADATA_BLOCK_SHIFT_ITEMS; return BTRFS_METADATA_BLOCK_BAD; } @@ -651,6 +654,27 @@ out: return ret; } +static void shift_items(struct btrfs_root *root, struct extent_buffer *eb) +{ + int nritems = btrfs_header_nritems(eb); + int shift_space = btrfs_leaf_free_space(root, eb) / 2; + int slot = nritems / 2; + int i = 0; + unsigned int data_end = btrfs_item_offset_nr(eb, nritems - 1); + + /* Shift the item data up to and including slot back by shift space */ + memmove_extent_buffer(eb, btrfs_leaf_data(eb) + data_end - shift_space, + btrfs_leaf_data(eb) + data_end, + btrfs_item_offset_nr(eb, slot - 1) - data_end); + + /* Now update the item pointers. */ + for (i = nritems - 1; i >= slot; i--) { + u32 offset = btrfs_item_offset_nr(eb, i); + offset -= shift_space; + btrfs_set_item_offset(eb, btrfs_item_nr(i), offset); + } +} + static int corrupt_metadata_block(struct btrfs_root *root, u64 block, char *field) { @@ -721,6 +745,9 @@ static int corrupt_metadata_block(struct btrfs_root *root, u64 block, bogus = generate_u64(orig); btrfs_set_header_generation(eb, bogus); break; + case BTRFS_METADATA_BLOCK_SHIFT_ITEMS: + shift_items(root, path->nodes[level]); + break; default: ret = -EINVAL; break; |