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| author |   Jens Axboe <axboe@kernel.dk> | 2018-12-20 08:49:00 -0700 |
|---|---|---|
| committer | Jens Axboe <axboe@kernel.dk> | 2018-12-20 12:17:05 -0700 |
| commit | 9f6b7ef6c3ebe35be77b0ae3cf12e4d25ae80420 (patch) | |
| tree | dd94ebc8b17053087b9a459beebdd4ed18ad326d /include/linux/sbitmap.h | |
| parent | block: save irq state in blkg_lookup_create() (diff) | |
| download | linux-dev-9f6b7ef6c3ebe35be77b0ae3cf12e4d25ae80420.tar.xz linux-dev-9f6b7ef6c3ebe35be77b0ae3cf12e4d25ae80420.zip | |
sbitmap: add helpers for add/del wait queue handling
After commit 5d2ee7122c73, users of sbitmap that need wait queue
handling must use the provided helpers. But we only added
prepare_to_wait()/finish_wait() style helpers, add the equivalent
add_wait_queue/list_del wrappers as we..
This is needed to ensure kyber plays by the sbitmap waitqueue
rules.
Tested-by: Ming Lei <ming.lei@redhat.com>
Reviewed-by: Omar Sandoval <osandov@fb.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Diffstat (limited to 'include/linux/sbitmap.h')
| -rw-r--r-- | include/linux/sbitmap.h | 16 |
1 files changed, 14 insertions, 2 deletions
diff --git a/include/linux/sbitmap.h b/include/linux/sbitmap.h index 03f50fcedc79..14d558146aea 100644 --- a/include/linux/sbitmap.h +++ b/include/linux/sbitmap.h @@ -560,13 +560,13 @@ void sbitmap_queue_wake_up(struct sbitmap_queue *sbq); void sbitmap_queue_show(struct sbitmap_queue *sbq, struct seq_file *m); struct sbq_wait { - int accounted; + struct sbitmap_queue *sbq; /* if set, sbq_wait is accounted */ struct wait_queue_entry wait; }; #define DEFINE_SBQ_WAIT(name) \ struct sbq_wait name = { \ - .accounted = 0, \ + .sbq = NULL, \ .wait = { \ .private = current, \ .func = autoremove_wake_function, \ @@ -588,4 +588,16 @@ void sbitmap_prepare_to_wait(struct sbitmap_queue *sbq, void sbitmap_finish_wait(struct sbitmap_queue *sbq, struct sbq_wait_state *ws, struct sbq_wait *sbq_wait); +/* + * Wrapper around add_wait_queue(), which maintains some extra internal state + */ +void sbitmap_add_wait_queue(struct sbitmap_queue *sbq, + struct sbq_wait_state *ws, + struct sbq_wait *sbq_wait); + +/* + * Must be paired with sbitmap_add_wait_queue() + */ +void sbitmap_del_wait_queue(struct sbq_wait *sbq_wait); + #endif /* __LINUX_SCALE_BITMAP_H */ |