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bcachefs: Check for casefolded dirents in non casefolded dirs

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Check for mismatches between casefold dirents and casefold directories.

A mismatch will cause lookups to fail, as we'll be doing the lookup with
the casefolded name, which won't match the non-casefolded dirent, and
vice versa.

Reported-by: Christopher Snowhill <chris@kode54.net>
Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>
This commit is contained in:
Kent Overstreet 2025-05-21 00:38:04 -04:00
parent ecd76c5f10
commit 010c894681
2 changed files with 42 additions and 1 deletions
repo.diff.show_diff_stats Download patch file Download diff file Expand all files Collapse all files

35
fs/bcachefs/fsck.c
View file

@ -2190,6 +2190,41 @@ static int check_dirent(struct btree_trans *trans, struct btree_iter *iter,
struct bkey_s_c_dirent d = bkey_s_c_to_dirent(k);
/* check casefold */
if (fsck_err_on(d.v->d_casefold != !!hash_info->cf_encoding,
trans, dirent_casefold_mismatch,
"dirent casefold does not match dir casefold\n%s",
(printbuf_reset(&buf),
bch2_bkey_val_to_text(&buf, c, k),
buf.buf))) {
struct qstr name = bch2_dirent_get_name(d);
u32 subvol = d.v->d_type == DT_SUBVOL
? d.v->d_parent_subvol
: 0;
u64 target = d.v->d_type == DT_SUBVOL
? d.v->d_child_subvol
: d.v->d_inum;
u64 dir_offset;
ret = bch2_hash_delete_at(trans,
bch2_dirent_hash_desc, hash_info, iter,
BTREE_UPDATE_internal_snapshot_node) ?:
bch2_dirent_create_snapshot(trans, subvol,
d.k->p.inode, d.k->p.snapshot,
hash_info,
d.v->d_type,
&name,
target,
&dir_offset,
BTREE_ITER_with_updates|
BTREE_UPDATE_internal_snapshot_node|
STR_HASH_must_create) ?:
bch2_trans_commit(trans, NULL, NULL, BCH_TRANS_COMMIT_no_enospc);
/* might need another check_dirents pass */
goto out;
}
if (d.v->d_type == DT_SUBVOL) {
ret = check_dirent_to_subvol(trans, iter, d);
if (ret)

8
fs/bcachefs/sb-errors_format.h
View file

@ -209,6 +209,7 @@ enum bch_fsck_flags {
x(subvol_to_missing_root, 188, 0) \
x(subvol_root_wrong_bi_subvol, 189, FSCK_AUTOFIX) \
x(bkey_in_missing_snapshot, 190, 0) \
x(bkey_in_deleted_snapshot, 315, 0) \
x(inode_pos_inode_nonzero, 191, 0) \
x(inode_pos_blockdev_range, 192, 0) \
x(inode_alloc_cursor_inode_bad, 301, 0) \
@ -216,6 +217,7 @@ enum bch_fsck_flags {
x(inode_str_hash_invalid, 194, 0) \
x(inode_v3_fields_start_bad, 195, 0) \
x(inode_snapshot_mismatch, 196, 0) \
x(snapshot_key_missing_inode_snapshot, 314, 0) \
x(inode_unlinked_but_clean, 197, 0) \
x(inode_unlinked_but_nlink_nonzero, 198, 0) \
x(inode_unlinked_and_not_open, 281, 0) \
@ -237,6 +239,8 @@ enum bch_fsck_flags {
x(inode_unreachable, 210, FSCK_AUTOFIX) \
x(inode_journal_seq_in_future, 299, FSCK_AUTOFIX) \
x(inode_i_sectors_underflow, 312, FSCK_AUTOFIX) \
x(inode_has_case_insensitive_not_set, 316, FSCK_AUTOFIX) \
x(inode_parent_has_case_insensitive_not_set, 317, FSCK_AUTOFIX) \
x(vfs_inode_i_blocks_underflow, 311, FSCK_AUTOFIX) \
x(vfs_inode_i_blocks_not_zero_at_truncate, 313, FSCK_AUTOFIX) \
x(deleted_inode_but_clean, 211, FSCK_AUTOFIX) \
@ -262,6 +266,7 @@ enum bch_fsck_flags {
x(dirent_to_overwritten_inode, 302, 0) \
x(dirent_to_missing_subvol, 230, 0) \
x(dirent_to_itself, 231, 0) \
x(dirent_casefold_mismatch, 318, FSCK_AUTOFIX) \
x(quota_type_invalid, 232, 0) \
x(xattr_val_size_too_small, 233, 0) \
x(xattr_val_size_too_big, 234, 0) \
@ -301,6 +306,7 @@ enum bch_fsck_flags {
x(btree_ptr_v2_written_0, 268, 0) \
x(subvol_snapshot_bad, 269, 0) \
x(subvol_inode_bad, 270, 0) \
x(subvol_missing, 308, FSCK_AUTOFIX) \
x(alloc_key_stripe_sectors_wrong, 271, FSCK_AUTOFIX) \
x(accounting_mismatch, 272, FSCK_AUTOFIX) \
x(accounting_replicas_not_marked, 273, 0) \
@ -322,7 +328,7 @@ enum bch_fsck_flags {
x(dirent_stray_data_after_cf_name, 305, 0) \
x(rebalance_work_incorrectly_set, 309, FSCK_AUTOFIX) \
x(rebalance_work_incorrectly_unset, 310, FSCK_AUTOFIX) \
x(MAX, 314, 0)
x(MAX, 319, 0)
enum bch_sb_error_id {
#define x(t, n, ...) BCH_FSCK_ERR_##t = n,