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btrfs-progs: lowmem check: Fix inlined data extent ref lookup 

When lowmem fsck tries to find backref of a specified file extent, it
searches inlined data ref first.

However, extent data ref contains both owner root objectid, inode number
and calculated offset (file offset - extent offset).

The code only checks owner root objectid, not checking inode number nor
calculated offset.

This makes lowmem mode fail to detect any backref mismatch if there is
a inlined data ref with the same owner objectid.

Fix it by also checking extent data ref's objectid and offset.

Fixes: b0d360b541 ("btrfs-progs: check: introduce function to check data backref in extent tree")
Reported-by: Chris Murphy <chris@colorremedies.com>
Signed-off-by: Qu Wenruo <wqu@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
This commit is contained in:
Qu Wenruo 2017-11-22 17:03:17 +08:00 committed by David Sterba
parent 702298b2d9
commit 7cf15bcc6a
1 changed files with 15 additions and 3 deletions
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18
cmds-check.c
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@ -12005,11 +12005,11 @@ static int check_extent_data_item(struct btrfs_root *root,
u64 disk_num_bytes;
u64 extent_num_bytes;
u64 extent_flags;
u64 offset;
u32 item_size;
unsigned long end;
unsigned long ptr;
int type;
u64 ref_root;
int found_dbackref = 0;
int slot = pathp->slots[0];
int err = 0;
@ -12027,6 +12027,7 @@ static int check_extent_data_item(struct btrfs_root *root,
disk_bytenr = btrfs_file_extent_disk_bytenr(eb, fi);
disk_num_bytes = btrfs_file_extent_disk_num_bytes(eb, fi);
extent_num_bytes = btrfs_file_extent_num_bytes(eb, fi);
offset = btrfs_file_extent_offset(eb, fi);
/* Check unaligned disk_num_bytes and num_bytes */
if (!IS_ALIGNED(disk_num_bytes, root->fs_info->sectorsize)) {
@ -12081,6 +12082,11 @@ static int check_extent_data_item(struct btrfs_root *root,
strict = should_check_extent_strictly(root, nrefs, -1);
while (ptr < end) {
u64 ref_root;
u64 ref_objectid;
u64 ref_offset;
bool match = false;
iref = (struct btrfs_extent_inline_ref *)ptr;
type = btrfs_extent_inline_ref_type(leaf, iref);
dref = (struct btrfs_extent_data_ref *)(&iref->offset);
@ -12092,9 +12098,15 @@ static int check_extent_data_item(struct btrfs_root *root,
}
if (type == BTRFS_EXTENT_DATA_REF_KEY) {
ref_root = btrfs_extent_data_ref_root(leaf, dref);
if (ref_root == root->objectid)
ref_objectid = btrfs_extent_data_ref_objectid(leaf, dref);
ref_offset = btrfs_extent_data_ref_offset(leaf, dref);
if (ref_objectid == fi_key.objectid &&
ref_offset == fi_key.offset - offset)
match = true;
if (ref_root == root->objectid && match)
found_dbackref = 1;
else if (!strict && owner == ref_root)
else if (!strict && owner == ref_root && match)
found_dbackref = 1;
} else if (type == BTRFS_SHARED_DATA_REF_KEY) {
found_dbackref = !check_tree_block_ref(root, NULL,