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md/raid5: add some more fields to stripe_head_state
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Adding these three fields will allow more common code to be moved
to handle_stripe()

struct field rearrangement by Namhyung Kim.

Signed-off-by: NeilBrown <neilb@suse.de>
Reviewed-by: Namhyung Kim <namhyung@gmail.com>
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NeilBrown committed Jul 26, 2011
1 parent f2b3b44 commit c5709ef
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Showing 2 changed files with 29 additions and 31 deletions.
54 changes: 24 additions & 30 deletions drivers/md/raid5.c
View file
Original file line number Diff line number Diff line change
Expand Up @@ -3003,12 +3003,9 @@ static void handle_stripe5(struct stripe_head *sh)
{
raid5_conf_t *conf = sh->raid_conf;
int disks = sh->disks, i;
struct bio *return_bi = NULL;
struct stripe_head_state s;
struct r5dev *dev;
mdk_rdev_t *blocked_rdev = NULL;
int prexor;
int dec_preread_active = 0;

memset(&s, 0, sizeof(s));
pr_debug("handling stripe %llu, state=%#lx cnt=%d, pd_idx=%d check:%d "
Expand Down Expand Up @@ -3058,9 +3055,9 @@ static void handle_stripe5(struct stripe_head *sh)
if (dev->written)
s.written++;
rdev = rcu_dereference(conf->disks[i].rdev);
if (blocked_rdev == NULL &&
if (s.blocked_rdev == NULL &&
rdev && unlikely(test_bit(Blocked, &rdev->flags))) {
blocked_rdev = rdev;
s.blocked_rdev = rdev;
atomic_inc(&rdev->nr_pending);
}
clear_bit(R5_Insync, &dev->flags);
Expand Down Expand Up @@ -3088,15 +3085,15 @@ static void handle_stripe5(struct stripe_head *sh)
spin_unlock_irq(&conf->device_lock);
rcu_read_unlock();

if (unlikely(blocked_rdev)) {
if (unlikely(s.blocked_rdev)) {
if (s.syncing || s.expanding || s.expanded ||
s.to_write || s.written) {
set_bit(STRIPE_HANDLE, &sh->state);
goto unlock;
}
/* There is nothing for the blocked_rdev to block */
rdev_dec_pending(blocked_rdev, conf->mddev);
blocked_rdev = NULL;
rdev_dec_pending(s.blocked_rdev, conf->mddev);
s.blocked_rdev = NULL;
}

if (s.to_fill && !test_bit(STRIPE_BIOFILL_RUN, &sh->state)) {
Expand All @@ -3112,7 +3109,7 @@ static void handle_stripe5(struct stripe_head *sh)
* need to be failed
*/
if (s.failed > 1 && s.to_read+s.to_write+s.written)
handle_failed_stripe(conf, sh, &s, disks, &return_bi);
handle_failed_stripe(conf, sh, &s, disks, &s.return_bi);
if (s.failed > 1 && s.syncing) {
md_done_sync(conf->mddev, STRIPE_SECTORS,0);
clear_bit(STRIPE_SYNCING, &sh->state);
Expand All @@ -3128,7 +3125,7 @@ static void handle_stripe5(struct stripe_head *sh)
!test_bit(R5_LOCKED, &dev->flags) &&
test_bit(R5_UPTODATE, &dev->flags)) ||
(s.failed == 1 && s.failed_num[0] == sh->pd_idx)))
handle_stripe_clean_event(conf, sh, disks, &return_bi);
handle_stripe_clean_event(conf, sh, disks, &s.return_bi);

/* Now we might consider reading some blocks, either to check/generate
* parity, or to satisfy requests
Expand Down Expand Up @@ -3166,7 +3163,7 @@ static void handle_stripe5(struct stripe_head *sh)
}
}
if (test_and_clear_bit(STRIPE_PREREAD_ACTIVE, &sh->state))
dec_preread_active = 1;
s.dec_preread_active = 1;
}

/* Now to consider new write requests and what else, if anything
Expand Down Expand Up @@ -3264,15 +3261,15 @@ static void handle_stripe5(struct stripe_head *sh)
unlock:

/* wait for this device to become unblocked */
if (unlikely(blocked_rdev))
md_wait_for_blocked_rdev(blocked_rdev, conf->mddev);
if (unlikely(s.blocked_rdev))
md_wait_for_blocked_rdev(s.blocked_rdev, conf->mddev);

if (s.ops_request)
raid_run_ops(sh, s.ops_request);

ops_run_io(sh, &s);

if (dec_preread_active) {
if (s.dec_preread_active) {
/* We delay this until after ops_run_io so that if make_request
* is waiting on a flush, it won't continue until the writes
* have actually been submitted.
Expand All @@ -3282,19 +3279,16 @@ static void handle_stripe5(struct stripe_head *sh)
IO_THRESHOLD)
md_wakeup_thread(conf->mddev->thread);
}
return_io(return_bi);
return_io(s.return_bi);
}

static void handle_stripe6(struct stripe_head *sh)
{
raid5_conf_t *conf = sh->raid_conf;
int disks = sh->disks;
struct bio *return_bi = NULL;
int i, pd_idx = sh->pd_idx, qd_idx = sh->qd_idx;
struct stripe_head_state s;
struct r5dev *dev, *pdev, *qdev;
mdk_rdev_t *blocked_rdev = NULL;
int dec_preread_active = 0;

pr_debug("handling stripe %llu, state=%#lx cnt=%d, "
"pd_idx=%d, qd_idx=%d\n, check:%d, reconstruct:%d\n",
Expand Down Expand Up @@ -3345,9 +3339,9 @@ static void handle_stripe6(struct stripe_head *sh)
if (dev->written)
s.written++;
rdev = rcu_dereference(conf->disks[i].rdev);
if (blocked_rdev == NULL &&
if (s.blocked_rdev == NULL &&
rdev && unlikely(test_bit(Blocked, &rdev->flags))) {
blocked_rdev = rdev;
s.blocked_rdev = rdev;
atomic_inc(&rdev->nr_pending);
}
clear_bit(R5_Insync, &dev->flags);
Expand Down Expand Up @@ -3376,15 +3370,15 @@ static void handle_stripe6(struct stripe_head *sh)
spin_unlock_irq(&conf->device_lock);
rcu_read_unlock();

if (unlikely(blocked_rdev)) {
if (unlikely(s.blocked_rdev)) {
if (s.syncing || s.expanding || s.expanded ||
s.to_write || s.written) {
set_bit(STRIPE_HANDLE, &sh->state);
goto unlock;
}
/* There is nothing for the blocked_rdev to block */
rdev_dec_pending(blocked_rdev, conf->mddev);
blocked_rdev = NULL;
rdev_dec_pending(s.blocked_rdev, conf->mddev);
s.blocked_rdev = NULL;
}

if (s.to_fill && !test_bit(STRIPE_BIOFILL_RUN, &sh->state)) {
Expand All @@ -3400,7 +3394,7 @@ static void handle_stripe6(struct stripe_head *sh)
* might need to be failed
*/
if (s.failed > 2 && s.to_read+s.to_write+s.written)
handle_failed_stripe(conf, sh, &s, disks, &return_bi);
handle_failed_stripe(conf, sh, &s, disks, &s.return_bi);
if (s.failed > 2 && s.syncing) {
md_done_sync(conf->mddev, STRIPE_SECTORS,0);
clear_bit(STRIPE_SYNCING, &sh->state);
Expand All @@ -3425,7 +3419,7 @@ static void handle_stripe6(struct stripe_head *sh)
(s.q_failed || ((test_bit(R5_Insync, &qdev->flags)
&& !test_bit(R5_LOCKED, &qdev->flags)
&& test_bit(R5_UPTODATE, &qdev->flags)))))
handle_stripe_clean_event(conf, sh, disks, &return_bi);
handle_stripe_clean_event(conf, sh, disks, &s.return_bi);

/* Now we might consider reading some blocks, either to check/generate
* parity, or to satisfy requests
Expand Down Expand Up @@ -3461,7 +3455,7 @@ static void handle_stripe6(struct stripe_head *sh)
}
}
if (test_and_clear_bit(STRIPE_PREREAD_ACTIVE, &sh->state))
dec_preread_active = 1;
s.dec_preread_active = 1;
}

/* Now to consider new write requests and what else, if anything
Expand Down Expand Up @@ -3561,16 +3555,16 @@ static void handle_stripe6(struct stripe_head *sh)
unlock:

/* wait for this device to become unblocked */
if (unlikely(blocked_rdev))
md_wait_for_blocked_rdev(blocked_rdev, conf->mddev);
if (unlikely(s.blocked_rdev))
md_wait_for_blocked_rdev(s.blocked_rdev, conf->mddev);

if (s.ops_request)
raid_run_ops(sh, s.ops_request);

ops_run_io(sh, &s);


if (dec_preread_active) {
if (s.dec_preread_active) {
/* We delay this until after ops_run_io so that if make_request
* is waiting on a flush, it won't continue until the writes
* have actually been submitted.
Expand All @@ -3581,7 +3575,7 @@ static void handle_stripe6(struct stripe_head *sh)
md_wakeup_thread(conf->mddev->thread);
}

return_io(return_bi);
return_io(s.return_bi);
}

static void handle_stripe(struct stripe_head *sh)
Expand Down
6 changes: 5 additions & 1 deletion drivers/md/raid5.h
View file
Original file line number Diff line number Diff line change
Expand Up @@ -243,8 +243,12 @@ struct stripe_head_state {
int locked, uptodate, to_read, to_write, failed, written;
int to_fill, compute, req_compute, non_overwrite;
int failed_num[2];
unsigned long ops_request;
int p_failed, q_failed;
int dec_preread_active;
unsigned long ops_request;

struct bio *return_bi;
mdk_rdev_t *blocked_rdev;
};

/* Flags */
Expand Down

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