diff options
| author | Kent Overstreet <kent.overstreet@linux.dev> | 2024-06-23 04:38:58 +0300 |
|---|---|---|
| committer | Kent Overstreet <kent.overstreet@linux.dev> | 2024-06-23 07:57:21 +0300 |
| commit | 06efa5f30c28eaf237247ca8c4cb46eb62cb6bd9 (patch) | |
| tree | 5441281fa1f247b064c9bf33b3dffd56ab59d262 /include | |
| parent | 18e92841e87bc548fcb91530115a66e72eecb10c (diff) | |
| download | linux-06efa5f30c28eaf237247ca8c4cb46eb62cb6bd9.tar.xz | |
closures: closure_get_not_zero(), closure_return_sync()
Provide new primitives for solving a lifetime issue with bcachefs
btree_trans objects.
closure_sync_return(): like closure_sync(), wait synchronously for any
outstanding gets. like closure_return, the closure is considered
"finished" and the ref left at 0.
closure_get_not_zero(): get a ref on a closure if it's alive, i.e. the
ref is not zero.
Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>
Diffstat (limited to 'include')
| -rw-r--r-- | include/linux/closure.h | 23 |
1 files changed, 23 insertions, 0 deletions
diff --git a/include/linux/closure.h b/include/linux/closure.h index 99155df162d0..59b8c06b11ff 100644 --- a/include/linux/closure.h +++ b/include/linux/closure.h @@ -285,6 +285,21 @@ static inline void closure_get(struct closure *cl) } /** + * closure_get_not_zero + */ +static inline bool closure_get_not_zero(struct closure *cl) +{ + unsigned old = atomic_read(&cl->remaining); + do { + if (!(old & CLOSURE_REMAINING_MASK)) + return false; + + } while (!atomic_try_cmpxchg_acquire(&cl->remaining, &old, old + 1)); + + return true; +} + +/** * closure_init - Initialize a closure, setting the refcount to 1 * @cl: closure to initialize * @parent: parent of the new closure. cl will take a refcount on it for its @@ -310,6 +325,12 @@ static inline void closure_init_stack(struct closure *cl) atomic_set(&cl->remaining, CLOSURE_REMAINING_INITIALIZER); } +static inline void closure_init_stack_release(struct closure *cl) +{ + memset(cl, 0, sizeof(struct closure)); + atomic_set_release(&cl->remaining, CLOSURE_REMAINING_INITIALIZER); +} + /** * closure_wake_up - wake up all closures on a wait list, * with memory barrier @@ -355,6 +376,8 @@ do { \ */ #define closure_return(_cl) continue_at((_cl), NULL, NULL) +void closure_return_sync(struct closure *cl); + /** * continue_at_nobarrier - jump to another function without barrier * |