Merge branch 'for-linus' of git://neil.brown.name/md

* 'for-linus' of git://neil.brown.name/md:
  md: raid5 crash during degradation
  md/raid5: never wait for bad-block acks on failed device.
  md: ensure new badblocks are handled promptly.
  md: bad blocks shouldn't cause a Blocked status on a Faulty device.
  md: take a reference to mddev during sysfs access.
  md: refine interpretation of "hold_active == UNTIL_IOCTL".
  md/lock: ensure updates to page_attrs are properly locked.

diff --git a/drivers/md/bitmap.c b/drivers/md/bitmap.c
index 7878712..b690711 100644 (file)
--- a/drivers/md/bitmap.c
+++ b/drivers/md/bitmap.c
@@ -1106,10 +1106,12 @@ void bitmap_write_all(struct bitmap *bitmap)
         */
        int i;
 
+       spin_lock_irq(&bitmap->lock);
        for (i = 0; i < bitmap->file_pages; i++)
                set_page_attr(bitmap, bitmap->filemap[i],
                              BITMAP_PAGE_NEEDWRITE);
        bitmap->allclean = 0;
+       spin_unlock_irq(&bitmap->lock);
 }
 
 static void bitmap_count_page(struct bitmap *bitmap, sector_t offset, int inc)
@@ -1605,7 +1607,9 @@ void bitmap_dirty_bits(struct bitmap *bitmap, unsigned long s, unsigned long e)
        for (chunk = s; chunk <= e; chunk++) {
                sector_t sec = (sector_t)chunk << CHUNK_BLOCK_SHIFT(bitmap);
                bitmap_set_memory_bits(bitmap, sec, 1);
+               spin_lock_irq(&bitmap->lock);
                bitmap_file_set_bit(bitmap, sec);
+               spin_unlock_irq(&bitmap->lock);
                if (sec < bitmap->mddev->recovery_cp)
                        /* We are asserting that the array is dirty,
                         * so move the recovery_cp address back so

diff --git a/drivers/md/md.c b/drivers/md/md.c
index 84acfe7..ee98173 100644 (file)
--- a/drivers/md/md.c
+++ b/drivers/md/md.c
@@ -570,7 +570,7 @@ static void mddev_put(struct mddev *mddev)
            mddev->ctime == 0 && !mddev->hold_active) {
                /* Array is not configured at all, and not held active,
                 * so destroy it */
-               list_del(&mddev->all_mddevs);
+               list_del_init(&mddev->all_mddevs);
                bs = mddev->bio_set;
                mddev->bio_set = NULL;
                if (mddev->gendisk) {
@@ -2546,7 +2546,8 @@ state_show(struct md_rdev *rdev, char *page)
                sep = ",";
        }
        if (test_bit(Blocked, &rdev->flags) ||
-           rdev->badblocks.unacked_exist) {
+           (rdev->badblocks.unacked_exist
+            && !test_bit(Faulty, &rdev->flags))) {
                len += sprintf(page+len, "%sblocked", sep);
                sep = ",";
        }
@@ -3788,6 +3789,8 @@ array_state_store(struct mddev *mddev, const char *buf, size_t len)
        if (err)
                return err;
        else {
+               if (mddev->hold_active == UNTIL_IOCTL)
+                       mddev->hold_active = 0;
                sysfs_notify_dirent_safe(mddev->sysfs_state);
                return len;
        }
@@ -4487,11 +4490,20 @@ md_attr_show(struct kobject *kobj, struct attribute *attr, char *page)
 
        if (!entry->show)
                return -EIO;
+       spin_lock(&all_mddevs_lock);
+       if (list_empty(&mddev->all_mddevs)) {
+               spin_unlock(&all_mddevs_lock);
+               return -EBUSY;
+       }
+       mddev_get(mddev);
+       spin_unlock(&all_mddevs_lock);
+
        rv = mddev_lock(mddev);
        if (!rv) {
                rv = entry->show(mddev, page);
                mddev_unlock(mddev);
        }
+       mddev_put(mddev);
        return rv;
 }
 
@@ -4507,13 +4519,19 @@ md_attr_store(struct kobject *kobj, struct attribute *attr,
                return -EIO;
        if (!capable(CAP_SYS_ADMIN))
                return -EACCES;
+       spin_lock(&all_mddevs_lock);
+       if (list_empty(&mddev->all_mddevs)) {
+               spin_unlock(&all_mddevs_lock);
+               return -EBUSY;
+       }
+       mddev_get(mddev);
+       spin_unlock(&all_mddevs_lock);
        rv = mddev_lock(mddev);
-       if (mddev->hold_active == UNTIL_IOCTL)
-               mddev->hold_active = 0;
        if (!rv) {
                rv = entry->store(mddev, page, length);
                mddev_unlock(mddev);
        }
+       mddev_put(mddev);
        return rv;
 }
 
@@ -7840,6 +7858,7 @@ int rdev_set_badblocks(struct md_rdev *rdev, sector_t s, int sectors,
                                  s + rdev->data_offset, sectors, acknowledged);
        if (rv) {
                /* Make sure they get written out promptly */
+               sysfs_notify_dirent_safe(rdev->sysfs_state);
                set_bit(MD_CHANGE_CLEAN, &rdev->mddev->flags);
                md_wakeup_thread(rdev->mddev->thread);
        }

diff --git a/drivers/md/raid5.c b/drivers/md/raid5.c
index 297e260..31670f8 100644 (file)
--- a/drivers/md/raid5.c
+++ b/drivers/md/raid5.c
@@ -3036,6 +3036,8 @@ static void analyse_stripe(struct stripe_head *sh, struct stripe_head_state *s)
                if (dev->written)
                        s->written++;
                rdev = rcu_dereference(conf->disks[i].rdev);
+               if (rdev && test_bit(Faulty, &rdev->flags))
+                       rdev = NULL;
                if (rdev) {
                        is_bad = is_badblock(rdev, sh->sector, STRIPE_SECTORS,
                                             &first_bad, &bad_sectors);
@@ -3063,12 +3065,12 @@ static void analyse_stripe(struct stripe_head *sh, struct stripe_head_state *s)
                        }
                } else if (test_bit(In_sync, &rdev->flags))
                        set_bit(R5_Insync, &dev->flags);
-               else if (!test_bit(Faulty, &rdev->flags)) {
+               else {
                        /* in sync if before recovery_offset */
                        if (sh->sector + STRIPE_SECTORS <= rdev->recovery_offset)
                                set_bit(R5_Insync, &dev->flags);
                }
-               if (test_bit(R5_WriteError, &dev->flags)) {
+               if (rdev && test_bit(R5_WriteError, &dev->flags)) {
                        clear_bit(R5_Insync, &dev->flags);
                        if (!test_bit(Faulty, &rdev->flags)) {
                                s->handle_bad_blocks = 1;
@@ -3076,7 +3078,7 @@ static void analyse_stripe(struct stripe_head *sh, struct stripe_head_state *s)
                        } else
                                clear_bit(R5_WriteError, &dev->flags);
                }
-               if (test_bit(R5_MadeGood, &dev->flags)) {
+               if (rdev && test_bit(R5_MadeGood, &dev->flags)) {
                        if (!test_bit(Faulty, &rdev->flags)) {
                                s->handle_bad_blocks = 1;
                                atomic_inc(&rdev->nr_pending);