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btrfs-progs: check/lowmem: Repair bad imode early 

For lowmem mode, if we hit a bad inode mode, normally it is reported
when we checking the DIR_INDEX/DIR_ITEM of the parent inode.

If we didn't repair at that time, the error will be recorded even if we
fixed it later.

So this patch will check for INODE_ITEM_MISMATCH error type, and if it's
really caused by invalid imode, repair it and clear the error.

Signed-off-by: Qu Wenruo <wqu@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
This commit is contained in:
Qu Wenruo 2019-09-12 11:11:33 +08:00 committed by David Sterba
parent 7f8383b7a6
commit 69eac9de0c
1 changed files with 39 additions and 0 deletions
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39
check/mode-lowmem.c
View File

@ -1550,6 +1550,35 @@ static int lowmem_delete_corrupted_dir_item(struct btrfs_root *root,
return ret;
}
static int try_repair_imode(struct btrfs_root *root, u64 ino)
{
struct btrfs_inode_item *iitem;
struct btrfs_path path;
struct btrfs_key key;
int ret;
key.objectid = ino;
key.type = BTRFS_INODE_ITEM_KEY;
key.offset = 0;
btrfs_init_path(&path);
ret = btrfs_search_slot(NULL, root, &key, &path, 0, 0);
if (ret > 0)
ret = -ENOENT;
if (ret < 0)
goto out;
iitem = btrfs_item_ptr(path.nodes[0], path.slots[0],
struct btrfs_inode_item);
if (!is_valid_imode(btrfs_inode_mode(path.nodes[0], iitem))) {
ret = repair_imode_common(root, &path);
} else {
ret = -ENOTTY;
}
out:
btrfs_release_path(&path);
return ret;
}
/*
* Call repair_inode_item_missing and repair_ternary_lowmem to repair
*
@ -1574,6 +1603,16 @@ static int repair_dir_item(struct btrfs_root *root, struct btrfs_key *di_key,
err &= ~(INODE_ITEM_MISMATCH | INODE_ITEM_MISSING);
}
if (err & INODE_ITEM_MISMATCH) {
/*
* INODE_ITEM mismatch can be caused by bad imode, so check if
* it's a bad imode, then repair if possible.
*/
ret = try_repair_imode(root, ino);
if (!ret)
err &= ~INODE_ITEM_MISMATCH;
}
if (err & ~(INODE_ITEM_MISMATCH | INODE_ITEM_MISSING)) {
ret = repair_ternary_lowmem(root, dirid, ino, index, namebuf,
name_len, filetype, err);