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| author | shaohua.li@intel.com <shaohua.li@intel.com> | 2011-05-06 19:34:32 +0200 |
|---|---|---|
| committer | Jens Axboe <jaxboe@fusionio.com> | 2011-05-06 19:36:25 +0200 |
| commit | f3876930952390a31c3a7fd68dd621464a36eb80 (patch) | |
| tree | 7fe2306a8dc2022ac7724b2d47629e38e3fb354b | |
| parent | iosched: remove redundant sprintf (diff) | |
| download | linux-f3876930952390a31c3a7fd68dd621464a36eb80.tar.xz linux-f3876930952390a31c3a7fd68dd621464a36eb80.zip | |
block: add a non-queueable flush flag
flush request isn't queueable in some drives. Add a flag to let driver
notify block layer about this. We can optimize flush performance with the
knowledge.
Stable: 2.6.39 only
Cc: stable@kernel.org
Signed-off-by: Shaohua Li <shaohua.li@intel.com>
Acked-by: Tejun Heo <tj@kernel.org>
Signed-off-by: Jens Axboe <jaxboe@fusionio.com>
| -rw-r--r-- | block/blk-settings.c | 6 | ||||
| -rw-r--r-- | include/linux/blkdev.h | 7 |
2 files changed, 13 insertions, 0 deletions
diff --git a/block/blk-settings.c b/block/blk-settings.c index 1fa769293597..cd3c428e194f 100644 --- a/block/blk-settings.c +++ b/block/blk-settings.c @@ -790,6 +790,12 @@ void blk_queue_flush(struct request_queue *q, unsigned int flush) } EXPORT_SYMBOL_GPL(blk_queue_flush); +void blk_queue_flush_queueable(struct request_queue *q, bool queueable) +{ + q->flush_not_queueable = !queueable; +} +EXPORT_SYMBOL_GPL(blk_queue_flush_queueable); + static int __init blk_settings_init(void) { blk_max_low_pfn = max_low_pfn - 1; diff --git a/include/linux/blkdev.h b/include/linux/blkdev.h index cbbfd98ad4a3..8bd2a271b2d8 100644 --- a/include/linux/blkdev.h +++ b/include/linux/blkdev.h @@ -364,6 +364,7 @@ struct request_queue * for flush operations */ unsigned int flush_flags; + unsigned int flush_not_queueable:1; unsigned int flush_pending_idx:1; unsigned int flush_running_idx:1; unsigned long flush_pending_since; @@ -843,6 +844,7 @@ extern void blk_queue_softirq_done(struct request_queue *, softirq_done_fn *); extern void blk_queue_rq_timed_out(struct request_queue *, rq_timed_out_fn *); extern void blk_queue_rq_timeout(struct request_queue *, unsigned int); extern void blk_queue_flush(struct request_queue *q, unsigned int flush); +extern void blk_queue_flush_queueable(struct request_queue *q, bool queueable); extern struct backing_dev_info *blk_get_backing_dev_info(struct block_device *bdev); extern int blk_rq_map_sg(struct request_queue *, struct request *, struct scatterlist *); @@ -1111,6 +1113,11 @@ static inline unsigned int block_size(struct block_device *bdev) return bdev->bd_block_size; } +static inline bool queue_flush_queueable(struct request_queue *q) +{ + return !q->flush_not_queueable; +} + typedef struct {struct page *v;} Sector; unsigned char *read_dev_sector(struct block_device *, sector_t, Sector *); |