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bcachefs: bch_fs.rw_devs_change_count

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Add a counter that's incremented whenever rw devices change; this will
be used for erasure coding so that it can keep ec_stripe_head in sync
and not deadlock on a new stripe when a device it wants goes away.

Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>
This commit is contained in:
Kent Overstreet 2024-09-06 19:12:53 -04:00
parent ad8d1f77fc
commit 83ccd9b31d
2 changed files with 9 additions and 4 deletions
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12
fs/bcachefs/alloc_background.c
View file

@ -2463,13 +2463,15 @@ static bool bch2_dev_has_open_write_point(struct bch_fs *c, struct bch_dev *ca)
/* device goes ro: */
void bch2_dev_allocator_remove(struct bch_fs *c, struct bch_dev *ca)
{
unsigned i;
lockdep_assert_held(&c->state_lock);
/* First, remove device from allocation groups: */
for (i = 0; i < ARRAY_SIZE(c->rw_devs); i++)
for (unsigned i = 0; i < ARRAY_SIZE(c->rw_devs); i++)
clear_bit(ca->dev_idx, c->rw_devs[i].d);
c->rw_devs_change_count++;
/*
* Capacity is calculated based off of devices in allocation groups:
*/
@ -2498,11 +2500,13 @@ void bch2_dev_allocator_remove(struct bch_fs *c, struct bch_dev *ca)
/* device goes rw: */
void bch2_dev_allocator_add(struct bch_fs *c, struct bch_dev *ca)
{
unsigned i;
lockdep_assert_held(&c->state_lock);
for (i = 0; i < ARRAY_SIZE(c->rw_devs); i++)
for (unsigned i = 0; i < ARRAY_SIZE(c->rw_devs); i++)
if (ca->mi.data_allowed & (1 << i))
set_bit(ca->dev_idx, c->rw_devs[i].d);
c->rw_devs_change_count++;
}
void bch2_dev_allocator_background_exit(struct bch_dev *ca)

1
fs/bcachefs/bcachefs.h
View file

@ -871,6 +871,7 @@ struct bch_fs {
/* ALLOCATION */
struct bch_devs_mask rw_devs[BCH_DATA_NR];
unsigned long rw_devs_change_count;
u64 capacity; /* sectors */
u64 reserved; /* sectors */