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md: notify userspace on 'write-pending' changes to array_state 

When an array enters write pending, 'array_state' changes, so we must be
sure to sysfs_notify.

Also, when waiting for user-space to acknowledge 'write-pending' by
marking the metadata as dirty, we don't want to wait for MD_CHANGE_DEVS to
be cleared as that might not happen.  So explicity test for the bits that
we are really interested in.

Signed-off-by: Neil Brown <neilb@suse.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
NeilBrown 2008-05-23 13:04:36 -07:00 committed by Linus Torvalds
parent 698b18c1e8
commit 09a44cc150
1 changed files with 10 additions and 1 deletions
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11
drivers/md/md.c
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@ -5435,8 +5435,11 @@ void md_write_start(mddev_t *mddev, struct bio *bi)
md_wakeup_thread(mddev->thread);
}
spin_unlock_irq(&mddev->write_lock);
sysfs_notify(&mddev->kobj, NULL, "array_state");
}
wait_event(mddev->sb_wait, mddev->flags==0);
wait_event(mddev->sb_wait,
!test_bit(MD_CHANGE_CLEAN, &mddev->flags) &&
!test_bit(MD_CHANGE_PENDING, &mddev->flags));
}
void md_write_end(mddev_t *mddev)
@ -5471,6 +5474,12 @@ void md_allow_write(mddev_t *mddev)
mddev->safemode = 1;
spin_unlock_irq(&mddev->write_lock);
md_update_sb(mddev, 0);
sysfs_notify(&mddev->kobj, NULL, "array_state");
/* wait for the dirty state to be recorded in the metadata */
wait_event(mddev->sb_wait,
!test_bit(MD_CHANGE_CLEAN, &mddev->flags) &&
!test_bit(MD_CHANGE_PENDING, &mddev->flags));
} else
spin_unlock_irq(&mddev->write_lock);
}