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Go Back   Linux Archive > Redhat > Device-mapper Development

 
 
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Old 02-15-2008, 09:29 PM
Kiyoshi Ueda
 
Default block: don't call __end_that_request_first() for clone

This patch adds a flag to indicate the request is a clone and
avoids __end_that_request_first() call for cloned requests
in blk_end_io().
So request-based dm can use blk_end_io() to complete clones
while dm doesn't want to complete the data in the clones.

Signed-off-by: Kiyoshi Ueda <k-ueda@ct.jp.nec.com>
Signed-off-by: Jun'ichi Nomura <j-nomura@ce.jp.nec.com>
---
block/blk-core.c | 2 +-
include/linux/blkdev.h | 3 +++
2 files changed, 4 insertions(+), 1 deletion(-)

Index: 2.6.25-rc1/block/blk-core.c
================================================== =================
--- 2.6.25-rc1.orig/block/blk-core.c
+++ 2.6.25-rc1/block/blk-core.c
@@ -1880,7 +1880,7 @@ static int blk_end_io(struct request *rq
struct request_queue *q = rq->q;
unsigned long flags = 0UL;

- if (blk_fs_request(rq) || blk_pc_request(rq)) {
+ if ((blk_fs_request(rq) || blk_pc_request(rq)) && !blk_cloned_rq(rq)) {
if (__end_that_request_first(rq, error, nr_bytes))
return 1;

Index: 2.6.25-rc1/include/linux/blkdev.h
================================================== =================
--- 2.6.25-rc1.orig/include/linux/blkdev.h
+++ 2.6.25-rc1/include/linux/blkdev.h
@@ -115,6 +115,7 @@ enum rq_flag_bits {
__REQ_RW_SYNC, /* request is sync (O_DIRECT) */
__REQ_ALLOCED, /* request came from our alloc pool */
__REQ_RW_META, /* metadata io request */
+ __REQ_CLONED, /* request is a clone of another request */
__REQ_NR_BITS, /* stops here */
};

@@ -136,6 +137,7 @@ enum rq_flag_bits {
#define REQ_RW_SYNC (1 << __REQ_RW_SYNC)
#define REQ_ALLOCED (1 << __REQ_ALLOCED)
#define REQ_RW_META (1 << __REQ_RW_META)
+#define REQ_CLONED (1 << __REQ_CLONED)

#define BLK_MAX_CDB 16

@@ -500,6 +502,7 @@ enum {
#define blk_sorted_rq(rq) ((rq)->cmd_flags & REQ_SORTED)
#define blk_barrier_rq(rq) ((rq)->cmd_flags & REQ_HARDBARRIER)
#define blk_fua_rq(rq) ((rq)->cmd_flags & REQ_FUA)
+#define blk_cloned_rq(rq) ((rq)->cmd_flags & REQ_CLONED)
#define blk_bidi_rq(rq) ((rq)->next_rq != NULL)
#define blk_empty_barrier(rq) (blk_barrier_rq(rq) && blk_fs_request(rq) && !(rq)->hard_nr_sectors)
/* rq->queuelist of dequeued request must be list_empty() */

--
dm-devel mailing list
dm-devel@redhat.com
https://www.redhat.com/mailman/listinfo/dm-devel
 

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