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md: factor out set_in_sync()

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Three separate places in md.c check if the number of active
writes is zero and, if so, sets mddev->in_sync.

There are a few differences, but there shouldn't be:
- it is always appropriate to notify the change in
  sysfs_state, and there is no need to do this outside a
  spin-locked region.
- we never need to check ->recovery_cp.  The state of resync
  is not relevant for whether there are any pending writes
  or not (which is what ->in_sync reports).

So create set_in_sync() which does the correct tests and
makes the correct changes, and call this in all three
places.

Any behaviour changes here a minor and cosmetic.

Signed-off-by: NeilBrown <neilb@suse.com>
Signed-off-by: Shaohua Li <shli@fb.com>
This commit is contained in:
NeilBrown 2017-03-15 14:05:14 +11:00 committed by Shaohua Li
parent 84dd97a690
commit 6497709b5d
1 changed files with 20 additions and 34 deletions
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54
drivers/md/md.c
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@ -2252,6 +2252,21 @@ static void export_array(struct mddev *mddev)
mddev->major_version = 0;
}
static bool set_in_sync(struct mddev *mddev)
{
WARN_ON_ONCE(!spin_is_locked(&mddev->lock));
if (atomic_read(&mddev->writes_pending) == 0) {
if (mddev->in_sync == 0) {
mddev->in_sync = 1;
set_bit(MD_SB_CHANGE_CLEAN, &mddev->sb_flags);
sysfs_notify_dirent_safe(mddev->sysfs_state);
}
}
if (mddev->safemode == 1)
mddev->safemode = 0;
return mddev->in_sync;
}
static void sync_sbs(struct mddev *mddev, int nospares)
{
/* Update each superblock (in-memory image), but
@ -4024,7 +4039,7 @@ static int restart_array(struct mddev *mddev);
static ssize_t
array_state_store(struct mddev *mddev, const char *buf, size_t len)
{
int err;
int err = 0;
enum array_state st = match_word(buf, array_states);
if (mddev->pers && (st == active || st == clean) && mddev->ro != 1) {
@ -4037,18 +4052,9 @@ array_state_store(struct mddev *mddev, const char *buf, size_t len)
clear_bit(MD_SB_CHANGE_PENDING, &mddev->sb_flags);
md_wakeup_thread(mddev->thread);
wake_up(&mddev->sb_wait);
err = 0;
} else /* st == clean */ {
restart_array(mddev);
if (atomic_read(&mddev->writes_pending) == 0) {
if (mddev->in_sync == 0) {
mddev->in_sync = 1;
if (mddev->safemode == 1)
mddev->safemode = 0;
set_bit(MD_SB_CHANGE_CLEAN, &mddev->sb_flags);
}
err = 0;
} else
if (!set_in_sync(mddev))
err = -EBUSY;
}
if (!err)
@ -4106,15 +4112,7 @@ array_state_store(struct mddev *mddev, const char *buf, size_t len)
if (err)
break;
spin_lock(&mddev->lock);
if (atomic_read(&mddev->writes_pending) == 0) {
if (mddev->in_sync == 0) {
mddev->in_sync = 1;
if (mddev->safemode == 1)
mddev->safemode = 0;
set_bit(MD_SB_CHANGE_CLEAN, &mddev->sb_flags);
}
err = 0;
} else
if (!set_in_sync(mddev))
err = -EBUSY;
spin_unlock(&mddev->lock);
} else
@ -8582,22 +8580,10 @@ void md_check_recovery(struct mddev *mddev)
}
}
if (!mddev->external) {
int did_change = 0;
if (!mddev->external && !mddev->in_sync) {
spin_lock(&mddev->lock);
if (mddev->safemode &&
!atomic_read(&mddev->writes_pending) &&
!mddev->in_sync &&
mddev->recovery_cp == MaxSector) {
mddev->in_sync = 1;
did_change = 1;
set_bit(MD_SB_CHANGE_CLEAN, &mddev->sb_flags);
}
if (mddev->safemode == 1)
mddev->safemode = 0;
set_in_sync(mddev);
spin_unlock(&mddev->lock);
if (did_change)
sysfs_notify_dirent_safe(mddev->sysfs_state);
}
if (mddev->sb_flags)