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bcachefs: Fix locking in __bch2_trans_mark_dev_sb()

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We run this in full RW mode now, so we have to guard against the
superblock buffer being reallocated.

Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>
This commit is contained in:
Kent Overstreet 2024-05-04 23:48:58 -04:00
parent 99c87fe0f5
commit 0e49d3ff12
2 changed files with 10 additions and 9 deletions
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5
fs/bcachefs/btree_gc.c
View File

@ -741,12 +741,9 @@ fsck_err:
static int bch2_mark_superblocks(struct bch_fs *c)
{
mutex_lock(&c->sb_lock);
gc_pos_set(c, gc_phase(GC_PHASE_sb));
int ret = bch2_trans_mark_dev_sbs_flags(c, BTREE_TRIGGER_gc);
mutex_unlock(&c->sb_lock);
return ret;
return bch2_trans_mark_dev_sbs_flags(c, BTREE_TRIGGER_gc);
}
static void bch2_gc_free(struct bch_fs *c)

14
fs/bcachefs/buckets.c
View File

@ -915,7 +915,6 @@ static int __bch2_trans_mark_metadata_bucket(struct btree_trans *trans,
enum bch_data_type type,
unsigned sectors)
{
struct bch_fs *c = trans->c;
struct btree_iter iter;
int ret = 0;
@ -1046,13 +1045,18 @@ static int bch2_trans_mark_metadata_sectors(struct btree_trans *trans,
static int __bch2_trans_mark_dev_sb(struct btree_trans *trans, struct bch_dev *ca,
enum btree_iter_update_trigger_flags flags)
{
struct bch_sb_layout *layout = &ca->disk_sb.sb->layout;
struct bch_fs *c = trans->c;
mutex_lock(&c->sb_lock);
struct bch_sb_layout layout = ca->disk_sb.sb->layout;
mutex_unlock(&c->sb_lock);
u64 bucket = 0;
unsigned i, bucket_sectors = 0;
int ret;
for (i = 0; i < layout->nr_superblocks; i++) {
u64 offset = le64_to_cpu(layout->sb_offset[i]);
for (i = 0; i < layout.nr_superblocks; i++) {
u64 offset = le64_to_cpu(layout.sb_offset[i]);
if (offset == BCH_SB_SECTOR) {
ret = bch2_trans_mark_metadata_sectors(trans, ca,
@ -1063,7 +1067,7 @@ static int __bch2_trans_mark_dev_sb(struct btree_trans *trans, struct bch_dev *c
}
ret = bch2_trans_mark_metadata_sectors(trans, ca, offset,
offset + (1 << layout->sb_max_size_bits),
offset + (1 << layout.sb_max_size_bits),
BCH_DATA_sb, &bucket, &bucket_sectors, flags);
if (ret)
return ret;