This is a note to let you know that I've just added the patch titled
block: add a non-queueable flush flag
to the 2.6.39-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
block-add-a-non-queueable-flush-flag.patch
and it can be found in the queue-2.6.39 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <[email protected]> know about it.
>From f3876930952390a31c3a7fd68dd621464a36eb80 Mon Sep 17 00:00:00 2001
From: "[email protected]" <[email protected]>
Date: Fri, 6 May 2011 11:34:32 -0600
Subject: block: add a non-queueable flush flag
From: "[email protected]" <[email protected]>
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 <[email protected]>
Acked-by: Tejun Heo <[email protected]>
Signed-off-by: Jens Axboe <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>
---
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 *);
Patches currently in stable-queue which might be from [email protected] are
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