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bcachefs: Check for directories with no backpointers

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It's legal for regular files to have missing backpointers (due to
hardlinks), and fsck should automatically add them, but for directories
this is an error that should be flagged.

Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>
This commit is contained in:
Kent Overstreet 2024-09-28 15:27:37 -04:00
parent 260af1562e
commit 1c6051bbd7
2 changed files with 17 additions and 8 deletions
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22
fs/bcachefs/fsck.c
View File

@ -1826,6 +1826,21 @@ static int check_dirent_inode_dirent(struct btree_trans *trans,
if (inode_points_to_dirent(target, d))
return 0;
if (!target->bi_dir &&
!target->bi_dir_offset) {
fsck_err_on(S_ISDIR(target->bi_mode),
trans, inode_dir_missing_backpointer,
"directory with missing backpointer\n%s",
(bch2_bkey_val_to_text(&buf, c, d.s_c),
prt_printf(&buf, "\n "),
bch2_inode_unpacked_to_text(&buf, target),
buf.buf));
target->bi_dir = d.k->p.inode;
target->bi_dir_offset = d.k->p.offset;
return __bch2_fsck_write_inode(trans, target, target_snapshot);
}
if (bch2_inode_should_have_bp(target) &&
!fsck_err(trans, inode_wrong_backpointer,
"dirent points to inode that does not point back:\n %s",
@ -1835,13 +1850,6 @@ static int check_dirent_inode_dirent(struct btree_trans *trans,
buf.buf)))
goto err;
if (!target->bi_dir &&
!target->bi_dir_offset) {
target->bi_dir = d.k->p.inode;
target->bi_dir_offset = d.k->p.offset;
return __bch2_fsck_write_inode(trans, target, target_snapshot);
}
struct bkey_s_c_dirent bp_dirent = dirent_get_by_pos(trans, &bp_iter,
SPOS(target->bi_dir, target->bi_dir_offset, target_snapshot));
ret = bkey_err(bp_dirent);

3
fs/bcachefs/sb-errors_format.h
View File

@ -219,6 +219,7 @@ enum bch_fsck_flags {
x(inode_i_sectors_wrong, 204, FSCK_AUTOFIX) \
x(inode_dir_wrong_nlink, 205, FSCK_AUTOFIX) \
x(inode_dir_multiple_links, 206, FSCK_AUTOFIX) \
x(inode_dir_missing_backpointer, 284, FSCK_AUTOFIX) \
x(inode_multiple_links_but_nlink_0, 207, FSCK_AUTOFIX) \
x(inode_wrong_backpointer, 208, FSCK_AUTOFIX) \
x(inode_wrong_nlink, 209, FSCK_AUTOFIX) \
@ -295,7 +296,7 @@ enum bch_fsck_flags {
x(accounting_key_replicas_devs_unsorted, 280, FSCK_AUTOFIX) \
x(accounting_key_version_0, 282, FSCK_AUTOFIX) \
x(logged_op_but_clean, 283, FSCK_AUTOFIX) \
x(MAX, 284, 0)
x(MAX, 285, 0)
enum bch_sb_error_id {
#define x(t, n, ...) BCH_FSCK_ERR_##t = n,