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authorshaohua.li@intel.com <shaohua.li@intel.com>2011-05-06 11:34:32 -0600
committerJens Axboe <jaxboe@fusionio.com>2011-05-06 11:36:25 -0600
commitf3876930952390a31c3a7fd68dd621464a36eb80 (patch)
tree7fe2306a8dc2022ac7724b2d47629e38e3fb354b /block/blk-settings.c
parent490b94be0282c3b67f56453628ff0aaae827a670 (diff)
downloadlinux-linaro-stable-f3876930952390a31c3a7fd68dd621464a36eb80.tar.gz
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>
Diffstat (limited to 'block/blk-settings.c')
-rw-r--r--block/blk-settings.c6
1 files changed, 6 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;