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[PATCH] md: merge md_enter_safemode into md_check_recovery

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md_enter_safemode checks if it is time to mark the md superblock as 'clean'.
i.e.  if all writes have completed and a suitable delay has passed.

This is currently called from md_handle_safemode which in-turn is called
(almost) every time md_check_recovery is called, and from the end of
md_do_sync which causes the mddev->thread to run, which will always call
md_check_recovery as well.

So it doesn't need to be a separate function and fits quite well into
md_check_recovery.

The "almost" is because multipathd calls md_check_recovery but not
md_handle_safemode.  This is OK because the code from md_enter_safemode is a
no-op if mddev->safemode == 0, which it always is for a multipathd (providing
we don't allow it to be set to 2 on a signal...)

Signed-off-by: Neil Brown <neilb@cse.unsw.edu.au>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
NeilBrown 2005-06-21 17:17:11 -07:00 committed by Linus Torvalds
parent c361777fb9
commit fca4d848f0
5 changed files with 24 additions and 38 deletions
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58
drivers/md/md.c
View file

@ -3203,37 +3203,6 @@ void md_write_end(mddev_t *mddev)
}
}
static inline void md_enter_safemode(mddev_t *mddev)
{
if (!mddev->safemode) return;
if (mddev->safemode == 2 &&
(atomic_read(&mddev->writes_pending) || mddev->in_sync ||
mddev->recovery_cp != MaxSector))
return; /* avoid the lock */
mddev_lock_uninterruptible(mddev);
if (mddev->safemode && !atomic_read(&mddev->writes_pending) &&
!mddev->in_sync && mddev->recovery_cp == MaxSector) {
mddev->in_sync = 1;
md_update_sb(mddev);
}
mddev_unlock(mddev);
if (mddev->safemode == 1)
mddev->safemode = 0;
}
void md_handle_safemode(mddev_t *mddev)
{
if (signal_pending(current)) {
printk(KERN_INFO "md: %s in immediate safe mode\n",
mdname(mddev));
mddev->safemode = 2;
flush_signals(current);
}
md_enter_safemode(mddev);
}
static DECLARE_WAIT_QUEUE_HEAD(resync_wait);
#define SYNC_MARKS 10
@ -3449,7 +3418,6 @@ static void md_do_sync(mddev_t *mddev)
mddev->recovery_cp = MaxSector;
}
md_enter_safemode(mddev);
skip:
mddev->curr_resync = 0;
wake_up(&resync_wait);
@ -3490,14 +3458,37 @@ void md_check_recovery(mddev_t *mddev)
if (mddev->ro)
return;
if (signal_pending(current)) {
if (mddev->pers->sync_request) {
printk(KERN_INFO "md: %s in immediate safe mode\n",
mdname(mddev));
mddev->safemode = 2;
}
flush_signals(current);
}
if ( ! (
mddev->sb_dirty ||
test_bit(MD_RECOVERY_NEEDED, &mddev->recovery) ||
test_bit(MD_RECOVERY_DONE, &mddev->recovery)
test_bit(MD_RECOVERY_DONE, &mddev->recovery) ||
(mddev->safemode == 1) ||
(mddev->safemode == 2 && ! atomic_read(&mddev->writes_pending)
&& !mddev->in_sync && mddev->recovery_cp == MaxSector)
))
return;
if (mddev_trylock(mddev)==0) {
int spares =0;
if (mddev->safemode && !atomic_read(&mddev->writes_pending) &&
!mddev->in_sync && mddev->recovery_cp == MaxSector) {
mddev->in_sync = 1;
mddev->sb_dirty = 1;
}
if (mddev->safemode == 1)
mddev->safemode = 0;
if (mddev->sb_dirty)
md_update_sb(mddev);
if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) &&
@ -3741,7 +3732,6 @@ EXPORT_SYMBOL(md_error);
EXPORT_SYMBOL(md_done_sync);
EXPORT_SYMBOL(md_write_start);
EXPORT_SYMBOL(md_write_end);
EXPORT_SYMBOL(md_handle_safemode);
EXPORT_SYMBOL(md_register_thread);
EXPORT_SYMBOL(md_unregister_thread);
EXPORT_SYMBOL(md_wakeup_thread);

1
drivers/md/raid1.c
View file

@ -931,7 +931,6 @@ static void raid1d(mddev_t *mddev)
mdk_rdev_t *rdev;
md_check_recovery(mddev);
md_handle_safemode(mddev);
for (;;) {
char b[BDEVNAME_SIZE];

1
drivers/md/raid10.c
View file

@ -1216,7 +1216,6 @@ static void raid10d(mddev_t *mddev)
mdk_rdev_t *rdev;
md_check_recovery(mddev);
md_handle_safemode(mddev);
for (;;) {
char b[BDEVNAME_SIZE];

1
drivers/md/raid5.c
View file

@ -1546,7 +1546,6 @@ static void raid5d (mddev_t *mddev)
PRINTK("+++ raid5d active\n");
md_check_recovery(mddev);
md_handle_safemode(mddev);
handled = 0;
spin_lock_irq(&conf->device_lock);

1
drivers/md/raid6main.c
View file

@ -1705,7 +1705,6 @@ static void raid6d (mddev_t *mddev)
PRINTK("+++ raid6d active\n");
md_check_recovery(mddev);
md_handle_safemode(mddev);
handled = 0;
spin_lock_irq(&conf->device_lock);