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Date: Fri, 27 Jun 2008 16:51:30 +1000
From: NeilBrown <neilb@...e.de>
To: Andrew Morton <akpm@...ux-foundation.org>
Cc: Dan Williams <dan.j.williams@...el.com>
Subject: [PATCH 020 of 29] md: md: kill STRIPE_OP_IO flag
From: Dan Williams <dan.j.williams@...el.com>
The R5_Want{Read,Write} flags already gate i/o. So, this flag is
superfluous and we can unconditionally call ops_run_io().
Signed-off-by: Dan Williams <dan.j.williams@...el.com>
Signed-off-by: Neil Brown <neilb@...e.de>
### Diffstat output
./drivers/md/raid5.c | 32 +++++---------------------------
./include/linux/raid/raid5.h | 1 -
2 files changed, 5 insertions(+), 28 deletions(-)
diff .prev/drivers/md/raid5.c ./drivers/md/raid5.c
--- .prev/drivers/md/raid5.c 2008-06-27 16:22:03.000000000 +1000
+++ ./drivers/md/raid5.c 2008-06-27 16:22:04.000000000 +1000
@@ -373,8 +373,6 @@ static unsigned long get_stripe_work(str
test_and_ack_op(STRIPE_OP_BIODRAIN, pending);
test_and_ack_op(STRIPE_OP_POSTXOR, pending);
test_and_ack_op(STRIPE_OP_CHECK, pending);
- if (test_and_clear_bit(STRIPE_OP_IO, &sh->ops.pending))
- ack++;
sh->ops.count -= ack;
if (unlikely(sh->ops.count < 0)) {
@@ -399,7 +397,6 @@ static void ops_run_io(struct stripe_hea
might_sleep();
- set_bit(STRIPE_IO_STARTED, &sh->state);
for (i = disks; i--; ) {
int rw;
struct bio *bi;
@@ -433,6 +430,8 @@ static void ops_run_io(struct stripe_hea
test_bit(STRIPE_EXPAND_READY, &sh->state))
md_sync_acct(rdev->bdev, STRIPE_SECTORS);
+ set_bit(STRIPE_IO_STARTED, &sh->state);
+
bi->bi_bdev = rdev->bdev;
pr_debug("%s: for %llu schedule op %ld on disc %d\n",
__func__, (unsigned long long)sh->sector,
@@ -900,9 +899,6 @@ static void raid5_run_ops(struct stripe_
if (test_bit(STRIPE_OP_CHECK, &pending))
ops_run_check(sh);
- if (test_bit(STRIPE_OP_IO, &pending))
- ops_run_io(sh);
-
if (overlap_clear)
for (i = disks; i--; ) {
struct r5dev *dev = &sh->dev[i];
@@ -2013,8 +2009,6 @@ static int __handle_issuing_new_read_req
*/
set_bit(R5_LOCKED, &dev->flags);
set_bit(R5_Wantread, &dev->flags);
- if (!test_and_set_bit(STRIPE_OP_IO, &sh->ops.pending))
- sh->ops.count++;
s->locked++;
pr_debug("Reading block %d (sync=%d)\n", disk_idx,
s->syncing);
@@ -2208,9 +2202,6 @@ static void handle_issuing_new_write_req
"%d for r-m-w\n", i);
set_bit(R5_LOCKED, &dev->flags);
set_bit(R5_Wantread, &dev->flags);
- if (!test_and_set_bit(
- STRIPE_OP_IO, &sh->ops.pending))
- sh->ops.count++;
s->locked++;
} else {
set_bit(STRIPE_DELAYED, &sh->state);
@@ -2234,9 +2225,6 @@ static void handle_issuing_new_write_req
"%d for Reconstruct\n", i);
set_bit(R5_LOCKED, &dev->flags);
set_bit(R5_Wantread, &dev->flags);
- if (!test_and_set_bit(
- STRIPE_OP_IO, &sh->ops.pending))
- sh->ops.count++;
s->locked++;
} else {
set_bit(STRIPE_DELAYED, &sh->state);
@@ -2444,8 +2432,6 @@ static void handle_parity_checks5(raid5_
set_bit(R5_LOCKED, &dev->flags);
set_bit(R5_Wantwrite, &dev->flags);
- if (!test_and_set_bit(STRIPE_OP_IO, &sh->ops.pending))
- sh->ops.count++;
clear_bit(STRIPE_DEGRADED, &sh->state);
s->locked++;
@@ -2801,9 +2787,6 @@ static void handle_stripe5(struct stripe
(i == sh->pd_idx || dev->written)) {
pr_debug("Writing block %d\n", i);
set_bit(R5_Wantwrite, &dev->flags);
- if (!test_and_set_bit(
- STRIPE_OP_IO, &sh->ops.pending))
- sh->ops.count++;
if (prexor)
continue;
if (!test_bit(R5_Insync, &dev->flags) ||
@@ -2857,16 +2840,12 @@ static void handle_stripe5(struct stripe
dev = &sh->dev[s.failed_num];
if (!test_bit(R5_ReWrite, &dev->flags)) {
set_bit(R5_Wantwrite, &dev->flags);
- if (!test_and_set_bit(STRIPE_OP_IO, &sh->ops.pending))
- sh->ops.count++;
set_bit(R5_ReWrite, &dev->flags);
set_bit(R5_LOCKED, &dev->flags);
s.locked++;
} else {
/* let's read it back */
set_bit(R5_Wantread, &dev->flags);
- if (!test_and_set_bit(STRIPE_OP_IO, &sh->ops.pending))
- sh->ops.count++;
set_bit(R5_LOCKED, &dev->flags);
s.locked++;
}
@@ -2884,13 +2863,10 @@ static void handle_stripe5(struct stripe
clear_bit(STRIPE_OP_POSTXOR, &sh->ops.ack);
clear_bit(STRIPE_OP_POSTXOR, &sh->ops.complete);
- for (i = conf->raid_disks; i--; ) {
+ for (i = conf->raid_disks; i--; )
set_bit(R5_Wantwrite, &sh->dev[i].flags);
set_bit(R5_LOCKED, &dev->flags);
s.locked++;
- if (!test_and_set_bit(STRIPE_OP_IO, &sh->ops.pending))
- sh->ops.count++;
- }
}
if (s.expanded && test_bit(STRIPE_EXPANDING, &sh->state) &&
@@ -2926,6 +2902,8 @@ static void handle_stripe5(struct stripe
if (pending)
raid5_run_ops(sh, pending);
+ ops_run_io(sh);
+
return_io(return_bi);
}
diff .prev/include/linux/raid/raid5.h ./include/linux/raid/raid5.h
--- .prev/include/linux/raid/raid5.h 2008-06-27 16:22:03.000000000 +1000
+++ ./include/linux/raid/raid5.h 2008-06-27 16:22:04.000000000 +1000
@@ -263,7 +263,6 @@ struct r6_state {
#define STRIPE_OP_BIODRAIN 3
#define STRIPE_OP_POSTXOR 4
#define STRIPE_OP_CHECK 5
-#define STRIPE_OP_IO 6
/* modifiers to the base operations
* STRIPE_OP_MOD_REPAIR_PD - compute the parity block and write it back
--
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