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bcachefs: bch2_dev_rcu_noerror()

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bch2_dev_rcu() now properly errors if the device is invalid

Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>
This commit is contained in:
Kent Overstreet 2024-09-01 18:12:26 -04:00
parent b99a94fd7a
commit 805ddc2042
6 changed files with 22 additions and 13 deletions
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2
fs/bcachefs/alloc_background.h
View File

@ -16,7 +16,7 @@ enum bch_validate_flags;
static inline bool bch2_dev_bucket_exists(struct bch_fs *c, struct bpos pos)
{
rcu_read_lock();
struct bch_dev *ca = bch2_dev_rcu(c, pos.inode);
struct bch_dev *ca = bch2_dev_rcu_noerror(c, pos.inode);
bool ret = ca && bucket_valid(ca, pos.offset);
rcu_read_unlock();
return ret;

6
fs/bcachefs/backpointers.c
View File

@ -55,7 +55,7 @@ int bch2_backpointer_validate(struct bch_fs *c, struct bkey_s_c k,
struct bkey_s_c_backpointer bp = bkey_s_c_to_backpointer(k);
rcu_read_lock();
struct bch_dev *ca = bch2_dev_rcu(c, bp.k->p.inode);
struct bch_dev *ca = bch2_dev_rcu_noerror(c, bp.k->p.inode);
if (!ca) {
/* these will be caught by fsck */
rcu_read_unlock();
@ -89,7 +89,7 @@ void bch2_backpointer_to_text(struct printbuf *out, const struct bch_backpointer
void bch2_backpointer_k_to_text(struct printbuf *out, struct bch_fs *c, struct bkey_s_c k)
{
rcu_read_lock();
struct bch_dev *ca = bch2_dev_rcu(c, k.k->p.inode);
struct bch_dev *ca = bch2_dev_rcu_noerror(c, k.k->p.inode);
if (ca) {
struct bpos bucket = bp_pos_to_bucket(ca, k.k->p);
rcu_read_unlock();
@ -673,7 +673,7 @@ static int check_extent_to_backpointers(struct btree_trans *trans,
continue;
rcu_read_lock();
struct bch_dev *ca = bch2_dev_rcu(c, p.ptr.dev);
struct bch_dev *ca = bch2_dev_rcu_noerror(c, p.ptr.dev);
if (ca)
bch2_extent_ptr_to_bp(c, ca, btree, level, k, p, entry, &bucket_pos, &bp);
rcu_read_unlock();

2
fs/bcachefs/buckets.c
View File

@ -281,7 +281,7 @@ int bch2_check_fix_ptrs(struct btree_trans *trans,
goto err;
rcu_read_lock();
bch2_bkey_drop_ptrs(bkey_i_to_s(new), ptr, !bch2_dev_rcu(c, ptr->dev));
bch2_bkey_drop_ptrs(bkey_i_to_s(new), ptr, !bch2_dev_exists(c, ptr->dev));
rcu_read_unlock();
if (level) {

5
fs/bcachefs/extents.c
View File

@ -1021,7 +1021,7 @@ void bch2_extent_ptr_to_text(struct printbuf *out, struct bch_fs *c, const struc
{
out->atomic++;
rcu_read_lock();
struct bch_dev *ca = bch2_dev_rcu(c, ptr->dev);
struct bch_dev *ca = bch2_dev_rcu_noerror(c, ptr->dev);
if (!ca) {
prt_printf(out, "ptr: %u:%llu gen %u%s", ptr->dev,
(u64) ptr->offset, ptr->gen,
@ -1125,8 +1125,9 @@ static int extent_ptr_validate(struct bch_fs *c,
{
int ret = 0;
/* bad pointers are repaired by check_fix_ptrs(): */
rcu_read_lock();
struct bch_dev *ca = bch2_dev_rcu(c, ptr->dev);
struct bch_dev *ca = bch2_dev_rcu_noerror(c, ptr->dev);
if (!ca) {
rcu_read_unlock();
return 0;

2
fs/bcachefs/replicas.c
View File

@ -795,7 +795,7 @@ bool bch2_have_enough_devs(struct bch_fs *c, struct bch_devs_mask devs,
for (unsigned i = 0; i < e->nr_devs; i++) {
nr_online += test_bit(e->devs[i], devs.d);
struct bch_dev *ca = bch2_dev_rcu(c, e->devs[i]);
struct bch_dev *ca = bch2_dev_rcu_noerror(c, e->devs[i]);
nr_failed += !ca || ca->mi.state == BCH_MEMBER_STATE_failed;
}
rcu_read_unlock();

18
fs/bcachefs/sb-members.h
View File

@ -198,29 +198,37 @@ static inline struct bch_dev *bch2_dev_locked(struct bch_fs *c, unsigned dev)
lockdep_is_held(&c->state_lock));
}
static inline struct bch_dev *bch2_dev_rcu(struct bch_fs *c, unsigned dev)
static inline struct bch_dev *bch2_dev_rcu_noerror(struct bch_fs *c, unsigned dev)
{
return c && dev < c->sb.nr_devices
? rcu_dereference(c->devs[dev])
: NULL;
}
void bch2_dev_missing(struct bch_fs *, unsigned);
static inline struct bch_dev *bch2_dev_rcu(struct bch_fs *c, unsigned dev)
{
struct bch_dev *ca = bch2_dev_rcu_noerror(c, dev);
if (unlikely(!ca))
bch2_dev_missing(c, dev);
return ca;
}
static inline struct bch_dev *bch2_dev_tryget_noerror(struct bch_fs *c, unsigned dev)
{
rcu_read_lock();
struct bch_dev *ca = bch2_dev_rcu(c, dev);
struct bch_dev *ca = bch2_dev_rcu_noerror(c, dev);
if (ca)
bch2_dev_get(ca);
rcu_read_unlock();
return ca;
}
void bch2_dev_missing(struct bch_fs *, unsigned);
static inline struct bch_dev *bch2_dev_tryget(struct bch_fs *c, unsigned dev)
{
struct bch_dev *ca = bch2_dev_tryget_noerror(c, dev);
if (!ca)
if (unlikely(!ca))
bch2_dev_missing(c, dev);
return ca;
}