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| author |  Kent Overstreet <kent.overstreet@linux.dev>
| 2023-05-20 20:40:08 -0400 |
|---|---|---|
| committer | Kent Overstreet <kent.overstreet@linux.dev>
| 2023-10-22 17:10:01 -0400 |
| commit | 01bf56a9771466147d94a013bc5678d0ed1b1382 (patch) | |
| tree | 331fdb701acdcab5d337dce6358caf058d46bb0f /fs/bcachefs/six.c | |
| parent | bcachefs: Don't call local_clock() twice in trans_begin() (diff) | |
| download | linux-01bf56a9771466147d94a013bc5678d0ed1b1382.tar.gz linux-01bf56a9771466147d94a013bc5678d0ed1b1382.tar.bz2 linux-01bf56a9771466147d94a013bc5678d0ed1b1382.zip | |
six locks: six_lock_readers_add()
This moves a helper out of the bcachefs code that shouldn't have been
there, since it touches six lock internals.
Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>
Diffstat (limited to 'fs/bcachefs/six.c')
| -rw-r--r-- | fs/bcachefs/six.c | 13 |
1 files changed, 13 insertions, 0 deletions
diff --git a/fs/bcachefs/six.c b/fs/bcachefs/six.c index b54a2ac480c8..0f9e1bf31008 100644 --- a/fs/bcachefs/six.c +++ b/fs/bcachefs/six.c @@ -40,6 +40,8 @@ struct six_lock_vals { enum six_lock_type unlock_wakeup; }; +#define __SIX_VAL(field, _v) (((union six_lock_state) { .field = _v }).v) + #define __SIX_LOCK_HELD_read __SIX_VAL(read_lock, ~0) #define __SIX_LOCK_HELD_intent __SIX_VAL(intent_lock, ~0) #define __SIX_LOCK_HELD_write __SIX_VAL(seq, 1) @@ -847,3 +849,14 @@ struct six_lock_count six_lock_counts(struct six_lock *lock) return ret; } EXPORT_SYMBOL_GPL(six_lock_counts); + +void six_lock_readers_add(struct six_lock *lock, int nr) +{ + if (lock->readers) + this_cpu_add(*lock->readers, nr); + else if (nr > 0) + atomic64_add(__SIX_VAL(read_lock, nr), &lock->state.counter); + else + atomic64_sub(__SIX_VAL(read_lock, -nr), &lock->state.counter); +} +EXPORT_SYMBOL_GPL(six_lock_readers_add); |