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| author | Jens Axboe <axboe@kernel.dk> | 2021-10-13 07:58:52 -0600 |
|---|---|---|
| committer | Jens Axboe <axboe@kernel.dk> | 2021-10-18 14:40:39 -0600 |
| commit | 013a7f95438144f4ab39a1017a0bff2765d2551a (patch) | |
| tree | 7e2924d5929d85a7c29c15230cfcea17f8824eb0 /include/linux/blkdev.h | |
| parent | afd7de03c5268f74202c1dd4780a8532a11f4c6b (diff) | |
| download | lwn-013a7f95438144f4ab39a1017a0bff2765d2551a.tar.gz lwn-013a7f95438144f4ab39a1017a0bff2765d2551a.zip | |
block: provide helpers for rq_list manipulation
Instead of open-coding the list additions, traversal, and removal,
provide a basic set of helpers.
Suggested-by: Christoph Hellwig <hch@infradead.org>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Diffstat (limited to 'include/linux/blkdev.h')
| -rw-r--r-- | include/linux/blkdev.h | 29 |
1 files changed, 29 insertions, 0 deletions
diff --git a/include/linux/blkdev.h b/include/linux/blkdev.h index d5b21fc8f49e..b0a322172965 100644 --- a/include/linux/blkdev.h +++ b/include/linux/blkdev.h @@ -1298,4 +1298,33 @@ int fsync_bdev(struct block_device *bdev); int freeze_bdev(struct block_device *bdev); int thaw_bdev(struct block_device *bdev); +#define rq_list_add(listptr, rq) do { \ + (rq)->rq_next = *(listptr); \ + *(listptr) = rq; \ +} while (0) + +#define rq_list_pop(listptr) \ +({ \ + struct request *__req = NULL; \ + if ((listptr) && *(listptr)) { \ + __req = *(listptr); \ + *(listptr) = __req->rq_next; \ + } \ + __req; \ +}) + +#define rq_list_peek(listptr) \ +({ \ + struct request *__req = NULL; \ + if ((listptr) && *(listptr)) \ + __req = *(listptr); \ + __req; \ +}) + +#define rq_list_for_each(listptr, pos) \ + for (pos = rq_list_peek((listptr)); pos; pos = rq_list_next(pos)) \ + +#define rq_list_next(rq) (rq)->rq_next +#define rq_list_empty(list) ((list) == (struct request *) NULL) + #endif /* _LINUX_BLKDEV_H */ |