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bcachefs: Kill opts.buckets_nouse

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Now explicitly allocate and free the buckets_nouse bitmap - this is
going to be used for online fsck.

To go RW when we haven't check allocations, we'll do a much slimmed down
version that just initializes the buckets_nouse bitmaps.

Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>
This commit is contained in:
Kent Overstreet 2024-04-06 00:07:46 -04:00
parent 706833dbe3
commit ffcbec6076
4 changed files with 32 additions and 24 deletions
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43
fs/bcachefs/buckets.c
View file

@ -1519,6 +1519,31 @@ int __bch2_disk_reservation_add(struct bch_fs *c, struct disk_reservation *res,
/* Startup/shutdown: */
void bch2_buckets_nouse_free(struct bch_fs *c)
{
for_each_member_device(c, ca) {
kvfree_rcu_mightsleep(ca->buckets_nouse);
ca->buckets_nouse = NULL;
}
}
int bch2_buckets_nouse_alloc(struct bch_fs *c)
{
for_each_member_device(c, ca) {
BUG_ON(ca->buckets_nouse);
ca->buckets_nouse = kvmalloc(BITS_TO_LONGS(ca->mi.nbuckets) *
sizeof(unsigned long),
GFP_KERNEL|__GFP_ZERO);
if (!ca->buckets_nouse) {
percpu_ref_put(&ca->ref);
return -BCH_ERR_ENOMEM_buckets_nouse;
}
}
return 0;
}
static void bucket_gens_free_rcu(struct rcu_head *rcu)
{
struct bucket_gens *buckets =
@ -1530,24 +1555,17 @@ static void bucket_gens_free_rcu(struct rcu_head *rcu)
int bch2_dev_buckets_resize(struct bch_fs *c, struct bch_dev *ca, u64 nbuckets)
{
struct bucket_gens *bucket_gens = NULL, *old_bucket_gens = NULL;
unsigned long *buckets_nouse = NULL;
bool resize = ca->bucket_gens != NULL;
int ret;
BUG_ON(resize && ca->buckets_nouse);
if (!(bucket_gens = kvmalloc(sizeof(struct bucket_gens) + nbuckets,
GFP_KERNEL|__GFP_ZERO))) {
ret = -BCH_ERR_ENOMEM_bucket_gens;
goto err;
}
if ((c->opts.buckets_nouse &&
!(buckets_nouse = kvmalloc(BITS_TO_LONGS(nbuckets) *
sizeof(unsigned long),
GFP_KERNEL|__GFP_ZERO)))) {
ret = -BCH_ERR_ENOMEM_buckets_nouse;
goto err;
}
bucket_gens->first_bucket = ca->mi.first_bucket;
bucket_gens->nbuckets = nbuckets;
@ -1565,17 +1583,11 @@ int bch2_dev_buckets_resize(struct bch_fs *c, struct bch_dev *ca, u64 nbuckets)
memcpy(bucket_gens->b,
old_bucket_gens->b,
n);
if (buckets_nouse)
memcpy(buckets_nouse,
ca->buckets_nouse,
BITS_TO_LONGS(n) * sizeof(unsigned long));
}
rcu_assign_pointer(ca->bucket_gens, bucket_gens);
bucket_gens = old_bucket_gens;
swap(ca->buckets_nouse, buckets_nouse);
nbuckets = ca->mi.nbuckets;
if (resize) {
@ -1586,7 +1598,6 @@ int bch2_dev_buckets_resize(struct bch_fs *c, struct bch_dev *ca, u64 nbuckets)
ret = 0;
err:
kvfree(buckets_nouse);
if (bucket_gens)
call_rcu(&bucket_gens->rcu, bucket_gens_free_rcu);

3
fs/bcachefs/buckets.h
View file

@ -472,6 +472,9 @@ static inline u64 avail_factor(u64 r)
return div_u64(r << RESERVE_FACTOR, (1 << RESERVE_FACTOR) + 1);
}
void bch2_buckets_nouse_free(struct bch_fs *);
int bch2_buckets_nouse_alloc(struct bch_fs *);
int bch2_dev_buckets_resize(struct bch_fs *, struct bch_dev *, u64);
void bch2_dev_buckets_free(struct bch_dev *);
int bch2_dev_buckets_alloc(struct bch_fs *, struct bch_dev *);

5
fs/bcachefs/opts.h
View file

@ -426,11 +426,6 @@ enum fsck_err_opts {
BCH_SB_VERSION_UPGRADE, BCH_VERSION_UPGRADE_compatible, \
NULL, "Set superblock to latest version,\n" \
"allowing any new features to be used") \
x(buckets_nouse, u8, \
0, \
OPT_BOOL(), \
BCH2_NO_SB_OPT, false, \
NULL, "Allocate the buckets_nouse bitmap") \
x(stdio, u64, \
0, \
OPT_UINT(0, S64_MAX), \

5
fs/bcachefs/super.c
View file

@ -531,9 +531,7 @@ int bch2_fs_read_write_early(struct bch_fs *c)
static void __bch2_fs_free(struct bch_fs *c)
{
unsigned i;
for (i = 0; i < BCH_TIME_STAT_NR; i++)
for (unsigned i = 0; i < BCH_TIME_STAT_NR; i++)
bch2_time_stats_exit(&c->times[i]);
bch2_find_btree_nodes_exit(&c->found_btree_nodes);
@ -1189,6 +1187,7 @@ static void bch2_dev_free(struct bch_dev *ca)
if (ca->kobj.state_in_sysfs)
kobject_del(&ca->kobj);
kfree(ca->buckets_nouse);
bch2_free_super(&ca->disk_sb);
bch2_dev_journal_exit(ca);