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Three fixes for md

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Merge tag 'md/3.19' of git://neil.brown.name/md

Pull md updates from Neil Brown:
 "Three fixes for md.

   I did have a largish set of locking changes queued, but late testing
  showed they weren't quite as stable as I thought and while I fixed
  what I found, I decided it safer to delay them a release ...
  particularly as I'll be AFK for a few weeks.  So expect a larger batch
  next time :-)"

* tag 'md/3.19' of git://neil.brown.name/md:
  md: Check MD_RECOVERY_RUNNING as well as ->sync_thread.
  md: fix semicolon.cocci warnings
  md/raid5: fetch_block must fetch all the blocks handle_stripe_dirtying wants.
This commit is contained in:
Linus Torvalds 2014-12-14 12:13:05 -08:00
commit 8fd9589ced
2 changed files with 32 additions and 13 deletions
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38
drivers/md/md.c
View file

@ -2691,7 +2691,8 @@ static ssize_t new_offset_store(struct md_rdev *rdev,
if (kstrtoull(buf, 10, &new_offset) < 0)
return -EINVAL;
if (mddev->sync_thread)
if (mddev->sync_thread ||
test_bit(MD_RECOVERY_RUNNING,&mddev->recovery))
return -EBUSY;
if (new_offset == rdev->data_offset)
/* reset is always permitted */
@ -3268,6 +3269,7 @@ level_store(struct mddev *mddev, const char *buf, size_t len)
*/
if (mddev->sync_thread ||
test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) ||
mddev->reshape_position != MaxSector ||
mddev->sysfs_active)
return -EBUSY;
@ -4022,6 +4024,7 @@ action_store(struct mddev *mddev, const char *page, size_t len)
clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
if (cmd_match(page, "idle") || cmd_match(page, "frozen")) {
flush_workqueue(md_misc_wq);
if (mddev->sync_thread) {
set_bit(MD_RECOVERY_INTR, &mddev->recovery);
md_reap_sync_thread(mddev);
@ -5040,6 +5043,7 @@ static void md_clean(struct mddev *mddev)
static void __md_stop_writes(struct mddev *mddev)
{
set_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
flush_workqueue(md_misc_wq);
if (mddev->sync_thread) {
set_bit(MD_RECOVERY_INTR, &mddev->recovery);
md_reap_sync_thread(mddev);
@ -5100,19 +5104,22 @@ static int md_set_readonly(struct mddev *mddev, struct block_device *bdev)
set_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
md_wakeup_thread(mddev->thread);
}
if (mddev->sync_thread) {
if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery))
set_bit(MD_RECOVERY_INTR, &mddev->recovery);
if (mddev->sync_thread)
/* Thread might be blocked waiting for metadata update
* which will now never happen */
wake_up_process(mddev->sync_thread->tsk);
}
mddev_unlock(mddev);
wait_event(resync_wait, mddev->sync_thread == NULL);
wait_event(resync_wait, !test_bit(MD_RECOVERY_RUNNING,
&mddev->recovery));
mddev_lock_nointr(mddev);
mutex_lock(&mddev->open_mutex);
if ((mddev->pers && atomic_read(&mddev->openers) > !!bdev) ||
mddev->sync_thread ||
test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) ||
(bdev && !test_bit(MD_STILL_CLOSED, &mddev->flags))) {
printk("md: %s still in use.\n",mdname(mddev));
if (did_freeze) {
@ -5158,20 +5165,24 @@ static int do_md_stop(struct mddev *mddev, int mode,
set_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
md_wakeup_thread(mddev->thread);
}
if (mddev->sync_thread) {
if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery))
set_bit(MD_RECOVERY_INTR, &mddev->recovery);
if (mddev->sync_thread)
/* Thread might be blocked waiting for metadata update
* which will now never happen */
wake_up_process(mddev->sync_thread->tsk);
}
mddev_unlock(mddev);
wait_event(resync_wait, mddev->sync_thread == NULL);
wait_event(resync_wait, (mddev->sync_thread == NULL &&
!test_bit(MD_RECOVERY_RUNNING,
&mddev->recovery)));
mddev_lock_nointr(mddev);
mutex_lock(&mddev->open_mutex);
if ((mddev->pers && atomic_read(&mddev->openers) > !!bdev) ||
mddev->sysfs_active ||
mddev->sync_thread ||
test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) ||
(bdev && !test_bit(MD_STILL_CLOSED, &mddev->flags))) {
printk("md: %s still in use.\n",mdname(mddev));
mutex_unlock(&mddev->open_mutex);
@ -5946,7 +5957,8 @@ static int update_size(struct mddev *mddev, sector_t num_sectors)
* of each device. If num_sectors is zero, we find the largest size
* that fits.
*/
if (mddev->sync_thread)
if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) ||
mddev->sync_thread)
return -EBUSY;
if (mddev->ro)
return -EROFS;
@ -5977,7 +5989,9 @@ static int update_raid_disks(struct mddev *mddev, int raid_disks)
if (raid_disks <= 0 ||
(mddev->max_disks && raid_disks >= mddev->max_disks))
return -EINVAL;
if (mddev->sync_thread || mddev->reshape_position != MaxSector)
if (mddev->sync_thread ||
test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) ||
mddev->reshape_position != MaxSector)
return -EBUSY;
rdev_for_each(rdev, mddev) {
@ -6965,7 +6979,7 @@ static unsigned int mdstat_poll(struct file *filp, poll_table *wait)
int mask;
if (md_unloading)
return POLLIN|POLLRDNORM|POLLERR|POLLPRI;;
return POLLIN|POLLRDNORM|POLLERR|POLLPRI;
poll_wait(filp, &md_event_waiters, wait);
/* always allow read */
@ -7589,6 +7603,7 @@ static void md_start_sync(struct work_struct *ws)
clear_bit(MD_RECOVERY_REQUESTED, &mddev->recovery);
clear_bit(MD_RECOVERY_CHECK, &mddev->recovery);
clear_bit(MD_RECOVERY_RUNNING, &mddev->recovery);
wake_up(&resync_wait);
if (test_and_clear_bit(MD_RECOVERY_RECOVER,
&mddev->recovery))
if (mddev->sysfs_action)
@ -7757,6 +7772,7 @@ void md_check_recovery(struct mddev *mddev)
not_running:
if (!mddev->sync_thread) {
clear_bit(MD_RECOVERY_RUNNING, &mddev->recovery);
wake_up(&resync_wait);
if (test_and_clear_bit(MD_RECOVERY_RECOVER,
&mddev->recovery))
if (mddev->sysfs_action)
@ -7775,7 +7791,6 @@ void md_reap_sync_thread(struct mddev *mddev)
/* resync has finished, collect result */
md_unregister_thread(&mddev->sync_thread);
wake_up(&resync_wait);
if (!test_bit(MD_RECOVERY_INTR, &mddev->recovery) &&
!test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) {
/* success...*/
@ -7803,6 +7818,7 @@ void md_reap_sync_thread(struct mddev *mddev)
clear_bit(MD_RECOVERY_RESHAPE, &mddev->recovery);
clear_bit(MD_RECOVERY_REQUESTED, &mddev->recovery);
clear_bit(MD_RECOVERY_CHECK, &mddev->recovery);
wake_up(&resync_wait);
/* flag recovery needed just to double check */
set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
sysfs_notify_dirent_safe(mddev->sysfs_action);

7
drivers/md/raid5.c
View file

@ -2917,8 +2917,11 @@ static int fetch_block(struct stripe_head *sh, struct stripe_head_state *s,
(sh->raid_conf->level <= 5 && s->failed && fdev[0]->towrite &&
(!test_bit(R5_Insync, &dev->flags) || test_bit(STRIPE_PREREAD_ACTIVE, &sh->state)) &&
!test_bit(R5_OVERWRITE, &fdev[0]->flags)) ||
(sh->raid_conf->level == 6 && s->failed && s->to_write &&
s->to_write - s->non_overwrite < sh->raid_conf->raid_disks - 2 &&
((sh->raid_conf->level == 6 ||
sh->sector >= sh->raid_conf->mddev->recovery_cp)
&& s->failed && s->to_write &&
(s->to_write - s->non_overwrite <
sh->raid_conf->raid_disks - sh->raid_conf->max_degraded) &&
(!test_bit(R5_Insync, &dev->flags) || test_bit(STRIPE_PREREAD_ACTIVE, &sh->state))))) {
/* we would like to get this block, possibly by computing it,
* otherwise read it if the backing disk is insync