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Subject[025/165] block: add a non-queueable flush flag
2.6.39-stable review patch.  If anyone has any objections, please let us know.

------------------
Content-Length: 2189
Lines: 66

From: "shaohua.li@intel.com" <shaohua.li@intel.com>

commit f3876930952390a31c3a7fd68dd621464a36eb80 upstream.

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

Signed-off-by: Shaohua Li <shaohua.li@intel.com>
Acked-by: Tejun Heo <tj@kernel.org>
Signed-off-by: Jens Axboe <jaxboe@fusionio.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

---
block/blk-settings.c | 6 ++++++
include/linux/blkdev.h | 7 +++++++
2 files changed, 13 insertions(+)

--- a/block/blk-settings.c
+++ b/block/blk-settings.c
@@ -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;
--- 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(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 *);



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