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bcachefs: Fix bch2_gc_accounting_done() locking

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The transaction commit path takes mark_lock, so we shouldn't be holding
it; use a bpos as an iterator so that we can drop and retake.

Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>
This commit is contained in:
Kent Overstreet 2024-06-06 14:33:27 -04:00
parent f73e6bb6d6
commit 820b9efeb1
2 changed files with 25 additions and 4 deletions
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18
fs/bcachefs/disk_accounting.c
View File

@ -448,18 +448,26 @@ int bch2_gc_accounting_done(struct bch_fs *c)
struct bch_accounting_mem *acc = &c->accounting;
struct btree_trans *trans = bch2_trans_get(c);
struct printbuf buf = PRINTBUF;
struct bpos pos = POS_MIN;
int ret = 0;
percpu_down_read(&c->mark_lock);
percpu_down_write(&c->mark_lock);
while (1) {
unsigned idx = eytzinger0_find_ge(acc->k.data, acc->k.nr, sizeof(acc->k.data[0]),
accounting_pos_cmp, &pos);
if (idx >= acc->k.nr)
break;
struct accounting_mem_entry *e = acc->k.data + idx;
pos = bpos_successor(e->pos);
darray_for_each(acc->k, e) {
struct disk_accounting_pos acc_k;
bpos_to_disk_accounting_pos(&acc_k, e->pos);
u64 src_v[BCH_ACCOUNTING_MAX_COUNTERS];
u64 dst_v[BCH_ACCOUNTING_MAX_COUNTERS];
unsigned idx = e - acc->k.data;
unsigned nr = e->nr_counters;
bch2_accounting_mem_read_counters(acc, idx, dst_v, nr, false);
bch2_accounting_mem_read_counters(acc, idx, src_v, nr, true);
@ -481,8 +489,10 @@ int bch2_gc_accounting_done(struct bch_fs *c)
src_v[j] -= dst_v[j];
if (fsck_err(trans, accounting_mismatch, "%s", buf.buf)) {
percpu_up_write(&c->mark_lock);
ret = commit_do(trans, NULL, NULL, 0,
bch2_disk_accounting_mod(trans, &acc_k, src_v, nr, false));
percpu_down_write(&c->mark_lock);
if (ret)
goto err;
@ -504,7 +514,7 @@ int bch2_gc_accounting_done(struct bch_fs *c)
}
err:
fsck_err:
percpu_up_read(&c->mark_lock);
percpu_up_write(&c->mark_lock);
printbuf_exit(&buf);
bch2_trans_put(trans);
bch_err_fn(c, ret);

11
fs/bcachefs/eytzinger.h
View File

@ -286,6 +286,17 @@ static inline int eytzinger0_find_gt(void *base, size_t nr, size_t size,
return eytzinger0_next(idx, nr);
}
static inline int eytzinger0_find_ge(void *base, size_t nr, size_t size,
cmp_func_t cmp, const void *search)
{
ssize_t idx = eytzinger0_find_le(base, nr, size, cmp, search);
if (idx < nr && !cmp(base + idx * size, search))
return idx;
return eytzinger0_next(idx, nr);
}
#define eytzinger0_find(base, nr, size, _cmp, search) \
({ \
void *_base = (base); \