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bcachefs: c->ro_ref

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Add a new refcount for async ops that don't necessarily need the fs to
be RW, with similar lifetime/rules otherwise as c->writes.

To be used by online fsck.

Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>
This commit is contained in:
Kent Overstreet
2023-12-06 16:26:18 -05:00
parent 483dea4431
commit 63508b7564
2 changed files with 27 additions and 0 deletions
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21
fs/bcachefs/bcachefs.h
View File

@@ -710,6 +710,13 @@ struct bch_fs {
#else
struct percpu_ref writes;
#endif
/*
* Analagous to c->writes, for asynchronous ops that don't necessarily
* need fs to be read-write
*/
refcount_t ro_ref;
wait_queue_head_t ro_ref_wait;
struct work_struct read_only_work;
struct bch_dev __rcu *devs[BCH_SB_MEMBERS_MAX];
@@ -1105,6 +1112,20 @@ static inline void bch2_write_ref_put(struct bch_fs *c, enum bch_write_ref ref)
#endif
}
static inline bool bch2_ro_ref_tryget(struct bch_fs *c)
{
if (test_bit(BCH_FS_stopping, &c->flags))
return false;
return refcount_inc_not_zero(&c->ro_ref);
}
static inline void bch2_ro_ref_put(struct bch_fs *c)
{
if (refcount_dec_and_test(&c->ro_ref))
wake_up(&c->ro_ref_wait);
}
static inline void bch2_set_ra_pages(struct bch_fs *c, unsigned ra_pages)
{
#ifndef NO_BCACHEFS_FS

6
fs/bcachefs/super.c
View File

@@ -599,6 +599,9 @@ void __bch2_fs_stop(struct bch_fs *c)
bch2_fs_debug_exit(c);
bch2_fs_chardev_exit(c);
bch2_ro_ref_put(c);
wait_event(c->ro_ref_wait, !refcount_read(&c->ro_ref));
kobject_put(&c->counters_kobj);
kobject_put(&c->time_stats);
kobject_put(&c->opts_dir);
@@ -729,6 +732,9 @@ static struct bch_fs *bch2_fs_alloc(struct bch_sb *sb, struct bch_opts opts)
mutex_init(&c->btree_root_lock);
INIT_WORK(&c->read_only_work, bch2_fs_read_only_work);
refcount_set(&c->ro_ref, 1);
init_waitqueue_head(&c->ro_ref_wait);
init_rwsem(&c->gc_lock);
mutex_init(&c->gc_gens_lock);
atomic_set(&c->journal_keys.ref, 1);