[patch v3 1/3] block: add a non-queueable flush flag
From: <hidden>
Date: 2011-05-05 02:04:24
Also in:
lkml
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. Signed-off-by: Shaohua Li <redacted> --- block/blk-settings.c | 6 ++++++ include/linux/blkdev.h | 7 +++++++ 2 files changed, 13 insertions(+) Index: linux/include/linux/blkdev.h ===================================================================
--- linux.orig/include/linux/blkdev.h 2011-05-04 14:23:42.000000000 +0800
+++ linux/include/linux/blkdev.h 2011-05-05 09:05:18.000000000 +0800@@ -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(struc 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(st 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 *);
Index: linux/block/blk-settings.c ===================================================================
--- linux.orig/block/blk-settings.c 2011-05-05 08:37:05.000000000 +0800
+++ linux/block/blk-settings.c 2011-05-05 09:02:16.000000000 +0800@@ -790,6 +790,12 @@ void blk_queue_flush(struct request_queu } 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;