REQ_SYNC is ignored in current raid5 code. Block layer does use it to do
policy,
for example ioscheduler. This patch adds it.
Signed-off-by: Shaohua Li <shli@xxxxxxxxxxxx>
---
drivers/md/raid5.c | 12 ++++++++++--
drivers/md/raid5.h | 1 +
2 files changed, 11 insertions(+), 2 deletions(-)
Index: linux/drivers/md/raid5.c
===================================================================
--- linux.orig/drivers/md/raid5.c 2012-04-17 11:59:24.556008869 +0800
+++ linux/drivers/md/raid5.c 2012-04-17 12:06:06.306007114 +0800
@@ -518,6 +518,8 @@ static void ops_run_io(struct stripe_hea
replace_only = 1;
} else
continue;
+ if (test_and_clear_bit(R5_SyncIO, &sh->dev[i].flags))
+ rw |= REQ_SYNC;
bi = &sh->dev[i].req;
rbi = &sh->dev[i].rreq; /* For writing to replacement */
@@ -1114,6 +1116,8 @@ ops_run_biodrain(struct stripe_head *sh,
dev->sector + STRIPE_SECTORS) {
if (wbi->bi_rw & REQ_FUA)
set_bit(R5_WantFUA, &dev->flags);
+ if (wbi->bi_rw & REQ_SYNC)
+ set_bit(R5_SyncIO, &dev->flags);
tx = async_copy_data(1, wbi, dev->page,
dev->sector, tx);
wbi = r5_next_bio(wbi, dev->sector);
@@ -1131,13 +1135,15 @@ static void ops_complete_reconstruct(voi
int pd_idx = sh->pd_idx;
int qd_idx = sh->qd_idx;
int i;
- bool fua = false;
+ bool fua = false, sync = false;
pr_debug("%s: stripe %llu\n", __func__,
(unsigned long long)sh->sector);
- for (i = disks; i--; )
+ for (i = disks; i--; ) {
fua |= test_bit(R5_WantFUA, &sh->dev[i].flags);
+ sync |= test_bit(R5_SyncIO, &sh->dev[i].flags);
+ }
for (i = disks; i--; ) {
struct r5dev *dev = &sh->dev[i];
@@ -1146,6 +1152,8 @@ static void ops_complete_reconstruct(voi
set_bit(R5_UPTODATE, &dev->flags);
if (fua)
set_bit(R5_WantFUA, &dev->flags);
+ if (sync)
+ set_bit(R5_SyncIO, &dev->flags);
}
}
Index: linux/drivers/md/raid5.h
===================================================================
--- linux.orig/drivers/md/raid5.h 2012-04-17 11:59:26.866008859 +0800
+++ linux/drivers/md/raid5.h 2012-04-17 12:00:29.196008586 +0800
@@ -285,6 +285,7 @@ enum r5dev_flags {
*/
R5_Wantdrain, /* dev->towrite needs to be drained */
R5_WantFUA, /* Write should be FUA */
+ R5_SyncIO, /* The IO is sync */
R5_WriteError, /* got a write error - need to record it */
R5_MadeGood, /* A bad block has been fixed by writing to it */
R5_ReadRepl, /* Will/did read from replacement rather than orig */
--
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