unimore/kernel-hacking-2024-linux-steffo
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bcachefs: Fix iterator leak in check_subvol()

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A couple small error handling fixes

Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>
This commit is contained in:
Kent Overstreet 2024-09-23 22:05:14 -04:00
parent 2a1df87346
commit 951dd86e7c
1 changed files with 26 additions and 28 deletions
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54
fs/bcachefs/subvolume.c
View file

@ -92,34 +92,32 @@ static int check_subvol(struct btree_trans *trans,
}
struct bch_inode_unpacked inode;
struct btree_iter inode_iter = {};
ret = bch2_inode_peek_nowarn(trans, &inode_iter, &inode,
ret = bch2_inode_find_by_inum_nowarn_trans(trans,
(subvol_inum) { k.k->p.offset, le64_to_cpu(subvol.v->inode) },
0);
bch2_trans_iter_exit(trans, &inode_iter);
if (ret && !bch2_err_matches(ret, ENOENT))
return ret;
if (fsck_err_on(ret,
trans, subvol_to_missing_root,
"subvolume %llu points to missing subvolume root %llu:%u",
k.k->p.offset, le64_to_cpu(subvol.v->inode),
le32_to_cpu(subvol.v->snapshot))) {
ret = bch2_subvolume_delete(trans, iter->pos.offset);
bch_err_msg(c, ret, "deleting subvolume %llu", iter->pos.offset);
return ret ?: -BCH_ERR_transaction_restart_nested;
}
if (fsck_err_on(inode.bi_subvol != subvol.k->p.offset,
trans, subvol_root_wrong_bi_subvol,
"subvol root %llu:%u has wrong bi_subvol field: got %u, should be %llu",
inode.bi_inum, inode_iter.k.p.snapshot,
inode.bi_subvol, subvol.k->p.offset)) {
inode.bi_subvol = subvol.k->p.offset;
ret = __bch2_fsck_write_inode(trans, &inode, le32_to_cpu(subvol.v->snapshot));
if (ret)
&inode);
if (!ret) {
if (fsck_err_on(inode.bi_subvol != subvol.k->p.offset,
trans, subvol_root_wrong_bi_subvol,
"subvol root %llu:%u has wrong bi_subvol field: got %u, should be %llu",
inode.bi_inum, inode.bi_snapshot,
inode.bi_subvol, subvol.k->p.offset)) {
inode.bi_subvol = subvol.k->p.offset;
ret = __bch2_fsck_write_inode(trans, &inode, le32_to_cpu(subvol.v->snapshot));
if (ret)
goto err;
}
} else if (bch2_err_matches(ret, ENOENT)) {
if (fsck_err(trans, subvol_to_missing_root,
"subvolume %llu points to missing subvolume root %llu:%u",
k.k->p.offset, le64_to_cpu(subvol.v->inode),
le32_to_cpu(subvol.v->snapshot))) {
ret = bch2_subvolume_delete(trans, iter->pos.offset);
bch_err_msg(c, ret, "deleting subvolume %llu", iter->pos.offset);
ret = ret ?: -BCH_ERR_transaction_restart_nested;
goto err;
}
} else {
goto err;
}
if (!BCH_SUBVOLUME_SNAP(subvol.v)) {
@ -137,7 +135,7 @@ static int check_subvol(struct btree_trans *trans,
"%s: snapshot tree %u not found", __func__, snapshot_tree);
if (ret)
return ret;
goto err;
if (fsck_err_on(le32_to_cpu(st.master_subvol) != subvol.k->p.offset,
trans, subvol_not_master_and_not_snapshot,
@ -147,7 +145,7 @@ static int check_subvol(struct btree_trans *trans,
bch2_bkey_make_mut_typed(trans, iter, &subvol.s_c, 0, subvolume);
ret = PTR_ERR_OR_ZERO(s);
if (ret)
return ret;
goto err;
SET_BCH_SUBVOLUME_SNAP(&s->v, true);
}