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md/raid5: move some more common code into handle_stripe
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The RAID6 version of this code is usable for RAID5 providing:
  - we test "conf->max_degraded" rather than "2" as appropriate
  - we make sure s->failed_num[1] is meaningful (and not '-1')
    when s->failed > 1

The 'return 1' must become 'goto finish' in the new location.

Signed-off-by: NeilBrown <neilb@suse.de>
Reviewed-by: Namhyung Kim <namhyung@gmail.com>
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NeilBrown committed Jul 27, 2011
1 parent 8478955 commit 474af96
Showing 1 changed file with 67 additions and 113 deletions.
180 changes: 67 additions & 113 deletions drivers/md/raid5.c
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Original file line number Diff line number Diff line change
Expand Up @@ -2968,72 +2968,23 @@ static int handle_stripe5(struct stripe_head *sh, struct stripe_head_state *s)
if (test_bit(R5_ReadError, &dev->flags))
clear_bit(R5_Insync, &dev->flags);
if (!test_bit(R5_Insync, &dev->flags)) {
if (s->failed < 2)
s->failed_num[s->failed] = i;
s->failed++;
s->failed_num[0] = i;
}
}
spin_unlock_irq(&conf->device_lock);
rcu_read_unlock();

if (unlikely(s->blocked_rdev)) {
if (s->syncing || s->expanding || s->expanded ||
s->to_write || s->written) {
set_bit(STRIPE_HANDLE, &sh->state);
return 1;
}
/* There is nothing for the blocked_rdev to block */
rdev_dec_pending(s->blocked_rdev, conf->mddev);
s->blocked_rdev = NULL;
}

if (s->to_fill && !test_bit(STRIPE_BIOFILL_RUN, &sh->state)) {
set_bit(STRIPE_OP_BIOFILL, &s->ops_request);
set_bit(STRIPE_BIOFILL_RUN, &sh->state);
}

pr_debug("locked=%d uptodate=%d to_read=%d"
" to_write=%d failed=%d failed_num=%d\n",
s->locked, s->uptodate, s->to_read, s->to_write,
s->failed, s->failed_num[0]);
/* check if the array has lost two devices and, if so, some requests might
* need to be failed
*/
if (s->failed > 1 && s->to_read+s->to_write+s->written)
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);
s->syncing = 0;
}

/* might be able to return some write requests if the parity block
* is safe, or on a failed drive
*/
dev = &sh->dev[sh->pd_idx];
if (s->written &&
((test_bit(R5_Insync, &dev->flags) &&
!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, &s->return_bi);

/* Now we might consider reading some blocks, either to check/generate
* parity, or to satisfy requests
* or to load a block that is being partially written.
*/
if (s->to_read || s->non_overwrite ||
(s->syncing && (s->uptodate + s->compute < disks)) || s->expanding)
handle_stripe_fill(sh, s, disks);

return 0;
}

static int handle_stripe6(struct stripe_head *sh, struct stripe_head_state *s)
{
raid5_conf_t *conf = sh->raid_conf;
int disks = sh->disks;
int i, pd_idx = sh->pd_idx, qd_idx = sh->qd_idx;
struct r5dev *dev, *pdev, *qdev;
struct r5dev *dev;
int i;

/* Now to look around and see what can be done */

Expand Down Expand Up @@ -3107,76 +3058,18 @@ static int handle_stripe6(struct stripe_head *sh, struct stripe_head_state *s)
spin_unlock_irq(&conf->device_lock);
rcu_read_unlock();

if (unlikely(s->blocked_rdev)) {
if (s->syncing || s->expanding || s->expanded ||
s->to_write || s->written) {
set_bit(STRIPE_HANDLE, &sh->state);
return 1;
}
/* There is nothing for the blocked_rdev to block */
rdev_dec_pending(s->blocked_rdev, conf->mddev);
s->blocked_rdev = NULL;
}

if (s->to_fill && !test_bit(STRIPE_BIOFILL_RUN, &sh->state)) {
set_bit(STRIPE_OP_BIOFILL, &s->ops_request);
set_bit(STRIPE_BIOFILL_RUN, &sh->state);
}

pr_debug("locked=%d uptodate=%d to_read=%d"
" to_write=%d failed=%d failed_num=%d,%d\n",
s->locked, s->uptodate, s->to_read, s->to_write, s->failed,
s->failed_num[0], s->failed_num[1]);
/* check if the array has lost >2 devices and, if so, some requests
* might need to be failed
*/
if (s->failed > 2 && s->to_read+s->to_write+s->written)
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);
s->syncing = 0;
}

/*
* might be able to return some write requests if the parity blocks
* are safe, or on a failed drive
*/
pdev = &sh->dev[pd_idx];
s->p_failed = (s->failed >= 1 && s->failed_num[0] == pd_idx)
|| (s->failed >= 2 && s->failed_num[1] == pd_idx);
qdev = &sh->dev[qd_idx];
s->q_failed = (s->failed >= 1 && s->failed_num[0] == qd_idx)
|| (s->failed >= 2 && s->failed_num[1] == qd_idx);

if (s->written &&
(s->p_failed || ((test_bit(R5_Insync, &pdev->flags)
&& !test_bit(R5_LOCKED, &pdev->flags)
&& test_bit(R5_UPTODATE, &pdev->flags)))) &&
(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, &s->return_bi);

/* Now we might consider reading some blocks, either to check/generate
* parity, or to satisfy requests
* or to load a block that is being partially written.
*/
if (s->to_read || s->non_overwrite || (s->to_write && s->failed) ||
(s->syncing && (s->uptodate + s->compute < disks)) || s->expanding)
handle_stripe_fill(sh, s, disks);

return 0;
}

static void handle_stripe(struct stripe_head *sh)
{
struct stripe_head_state s;
int done;
raid5_conf_t *conf = sh->raid_conf;
int i;
int prexor;
int disks = sh->disks;
raid5_conf_t *conf = sh->raid_conf;
struct r5dev *pdev, *qdev;

clear_bit(STRIPE_HANDLE, &sh->state);
if (test_and_set_bit(STRIPE_ACTIVE, &sh->state)) {
Expand Down Expand Up @@ -3213,6 +3106,67 @@ static void handle_stripe(struct stripe_head *sh)
if (done)
goto finish;

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

if (s.to_fill && !test_bit(STRIPE_BIOFILL_RUN, &sh->state)) {
set_bit(STRIPE_OP_BIOFILL, &s.ops_request);
set_bit(STRIPE_BIOFILL_RUN, &sh->state);
}

pr_debug("locked=%d uptodate=%d to_read=%d"
" to_write=%d failed=%d failed_num=%d,%d\n",
s.locked, s.uptodate, s.to_read, s.to_write, s.failed,
s.failed_num[0], s.failed_num[1]);
/* check if the array has lost more than max_degraded devices and,
* if so, some requests might need to be failed.
*/
if (s.failed > conf->max_degraded && s.to_read+s.to_write+s.written)
handle_failed_stripe(conf, sh, &s, disks, &s.return_bi);
if (s.failed > conf->max_degraded && s.syncing) {
md_done_sync(conf->mddev, STRIPE_SECTORS, 0);
clear_bit(STRIPE_SYNCING, &sh->state);
s.syncing = 0;
}

/*
* might be able to return some write requests if the parity blocks
* are safe, or on a failed drive
*/
pdev = &sh->dev[sh->pd_idx];
s.p_failed = (s.failed >= 1 && s.failed_num[0] == sh->pd_idx)
|| (s.failed >= 2 && s.failed_num[1] == sh->pd_idx);
qdev = &sh->dev[sh->qd_idx];
s.q_failed = (s.failed >= 1 && s.failed_num[0] == sh->qd_idx)
|| (s.failed >= 2 && s.failed_num[1] == sh->qd_idx)
|| conf->level < 6;

if (s.written &&
(s.p_failed || ((test_bit(R5_Insync, &pdev->flags)
&& !test_bit(R5_LOCKED, &pdev->flags)
&& test_bit(R5_UPTODATE, &pdev->flags)))) &&
(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, &s.return_bi);

/* Now we might consider reading some blocks, either to check/generate
* parity, or to satisfy requests
* or to load a block that is being partially written.
*/
if (s.to_read || s.non_overwrite
|| (conf->level == 6 && s.to_write && s.failed)
|| (s.syncing && (s.uptodate + s.compute < disks)) || s.expanding)
handle_stripe_fill(sh, &s, disks);

/* Now we check to see if any write operations have recently
* completed
*/
Expand Down

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