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bcachefs: Don't corrupt journal keys gap buffer when dropping alloc info

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Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>
This commit is contained in:
Kent Overstreet 2024-03-16 21:22:47 -04:00
parent f3589bfa7e
commit a586036841
3 changed files with 9 additions and 2 deletions
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2
fs/bcachefs/btree_io.c
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@ -1338,7 +1338,7 @@ static void btree_node_read_work(struct work_struct *work)
if (saw_error && !btree_node_read_error(b)) {
printbuf_reset(&buf);
bch2_bpos_to_text(&buf, b->key.k.p);
bch_info(c, "%s: rewriting btree node at btree=%s level=%u %s due to error",
bch_err_ratelimited(c, "%s: rewriting btree node at btree=%s level=%u %s due to error",
__func__, bch2_btree_id_str(b->c.btree_id), b->c.level, buf.buf);
bch2_btree_node_rewrite_async(c, b);

6
fs/bcachefs/recovery.c
View file

@ -90,10 +90,12 @@ static void do_reconstruct_alloc(struct bch_fs *c)
struct journal_keys *keys = &c->journal_keys;
size_t src, dst;
move_gap(keys, keys->nr);
for (src = 0, dst = 0; src < keys->nr; src++)
if (!btree_id_is_alloc(keys->data[src].btree_id))
keys->data[dst++] = keys->data[src];
keys->nr = dst;
keys->nr = keys->gap = dst;
}
/*
@ -203,6 +205,8 @@ static int bch2_journal_replay(struct bch_fs *c)
BUG_ON(!atomic_read(&keys->ref));
move_gap(keys, keys->nr);
/*
* First, attempt to replay keys in sorted order. This is more
* efficient - better locality of btree access - but some might fail if

3
fs/bcachefs/util.h
View file

@ -683,6 +683,9 @@ static inline void __move_gap(void *array, size_t element_size,
/* Move the gap in a gap buffer: */
#define move_gap(_d, _new_gap) \
do { \
BUG_ON(_new_gap > (_d)->nr); \
BUG_ON((_d)->gap > (_d)->nr); \
\
__move_gap((_d)->data, sizeof((_d)->data[0]), \
(_d)->nr, (_d)->size, (_d)->gap, _new_gap); \
(_d)->gap = _new_gap; \