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| author | Ming Lei <ming.lei@canonical.com> | 2014-09-25 23:23:40 +0800 |
|---|---|---|
| committer | Jens Axboe <axboe@fb.com> | 2014-09-25 15:22:35 -0600 |
| commit | f355265571440a7db16e784b6edf4e7d26971a03 (patch) | |
| tree | 79b20c37c734b5932dcecc9e85850847b0a69855 /block/blk-flush.c | |
| parent | 1bcb1eada4f11a713cbe586d1b5a5d93a48277cb (diff) | |
| download | lwn-f355265571440a7db16e784b6edf4e7d26971a03.tar.gz lwn-f355265571440a7db16e784b6edf4e7d26971a03.zip | |
block: introduce blk_init_flush and its pair
These two temporary functions are introduced for holding flush
initialization and de-initialization, so that we can
introduce 'flush queue' easier in the following patch. And
once 'flush queue' and its allocation/free functions are ready,
they will be removed for sake of code readability.
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Ming Lei <ming.lei@canonical.com>
Signed-off-by: Jens Axboe <axboe@fb.com>
Diffstat (limited to 'block/blk-flush.c')
| -rw-r--r-- | block/blk-flush.c | 19 |
1 files changed, 18 insertions, 1 deletions
diff --git a/block/blk-flush.c b/block/blk-flush.c index 55028a707927..c72ab32fd8eb 100644 --- a/block/blk-flush.c +++ b/block/blk-flush.c @@ -472,7 +472,7 @@ int blkdev_issue_flush(struct block_device *bdev, gfp_t gfp_mask, } EXPORT_SYMBOL(blkdev_issue_flush); -int blk_mq_init_flush(struct request_queue *q) +static int blk_mq_init_flush(struct request_queue *q) { struct blk_mq_tag_set *set = q->tag_set; @@ -485,3 +485,20 @@ int blk_mq_init_flush(struct request_queue *q) return -ENOMEM; return 0; } + +int blk_init_flush(struct request_queue *q) +{ + if (q->mq_ops) + return blk_mq_init_flush(q); + + q->flush_rq = kzalloc(sizeof(struct request), GFP_KERNEL); + if (!q->flush_rq) + return -ENOMEM; + + return 0; +} + +void blk_exit_flush(struct request_queue *q) +{ + kfree(q->flush_rq); +} |