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Make sure all changes to md/array_state are notified.

Browse source 
Changes in md/array_state could be of interest to a monitoring
program.  So make sure all changes trigger a notification.

Exceptions:
   changing active_idle to active is not reported because it
      is frequent and not interesting.
   changing active to active_idle is only reported on arrays
      with externally managed metadata, as it is not interesting
      otherwise.

Signed-off-by: Neil Brown <neilb@suse.de>
This commit is contained in:
Neil Brown 2008-06-28 08:31:36 +10:00
parent c7d0c941ae
commit 0fd62b861e
2 changed files with 29 additions and 5 deletions
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5
Documentation/md.txt
View file

@ -236,6 +236,11 @@ All md devices contain:
writing the word for the desired state, however some states
cannot be explicitly set, and some transitions are not allowed.
Select/poll works on this file. All changes except between
active_idle and active (which can be frequent and are not
very interesting) are notified. active->active_idle is
reported if the metadata is externally managed.
clear
No devices, no size, no level
Writing is equivalent to STOP_ARRAY ioctl

23
drivers/md/md.c
View file

@ -2716,9 +2716,11 @@ array_state_store(mddev_t *mddev, const char *buf, size_t len)
}
if (err)
return err;
else
else {
sysfs_notify(&mddev->kobj, NULL, "array_state");
return len;
}
}
static struct md_sysfs_entry md_array_state =
__ATTR(array_state, S_IRUGO|S_IWUSR, array_state_show, array_state_store);
@ -3408,7 +3410,11 @@ static void md_safemode_timeout(unsigned long data)
{
mddev_t *mddev = (mddev_t *) data;
if (!atomic_read(&mddev->writes_pending)) {
mddev->safemode = 1;
if (mddev->external)
sysfs_notify(&mddev->kobj, NULL, "array_state");
}
md_wakeup_thread(mddev->thread);
}
@ -3675,6 +3681,7 @@ static int do_md_run(mddev_t * mddev)
mddev->changed = 1;
md_new_event(mddev);
sysfs_notify(&mddev->kobj, NULL, "array_state");
kobject_uevent(&mddev->gendisk->dev.kobj, KOBJ_CHANGE);
return 0;
}
@ -3709,6 +3716,8 @@ static int restart_array(mddev_t *mddev)
md_wakeup_thread(mddev->thread);
md_wakeup_thread(mddev->sync_thread);
err = 0;
sysfs_notify(&mddev->kobj, NULL, "array_state");
} else
err = -EINVAL;
@ -3879,6 +3888,7 @@ static int do_md_stop(mddev_t * mddev, int mode)
mdname(mddev));
err = 0;
md_new_event(mddev);
sysfs_notify(&mddev->kobj, NULL, "array_state");
out:
return err;
}
@ -4876,6 +4886,7 @@ static int md_ioctl(struct inode *inode, struct file *file,
mddev->ro && mddev->pers) {
if (mddev->ro == 2) {
mddev->ro = 0;
sysfs_notify(&mddev->kobj, NULL, "array_state");
set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
md_wakeup_thread(mddev->thread);
@ -5516,6 +5527,7 @@ void md_done_sync(mddev_t *mddev, int blocks, int ok)
*/
void md_write_start(mddev_t *mddev, struct bio *bi)
{
int did_change = 0;
if (bio_data_dir(bi) != WRITE)
return;
@ -5526,6 +5538,7 @@ void md_write_start(mddev_t *mddev, struct bio *bi)
set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
md_wakeup_thread(mddev->thread);
md_wakeup_thread(mddev->sync_thread);
did_change = 1;
}
atomic_inc(&mddev->writes_pending);
if (mddev->safemode == 1)
@ -5536,10 +5549,12 @@ void md_write_start(mddev_t *mddev, struct bio *bi)
mddev->in_sync = 0;
set_bit(MD_CHANGE_CLEAN, &mddev->flags);
md_wakeup_thread(mddev->thread);
did_change = 1;
}
spin_unlock_irq(&mddev->write_lock);
sysfs_notify(&mddev->kobj, NULL, "array_state");
}
if (did_change)
sysfs_notify(&mddev->kobj, NULL, "array_state");
wait_event(mddev->sb_wait,
!test_bit(MD_CHANGE_CLEAN, &mddev->flags) &&
!test_bit(MD_CHANGE_PENDING, &mddev->flags));
@ -5991,18 +6006,22 @@ void md_check_recovery(mddev_t *mddev)
int spares = 0;
if (!mddev->external) {
int did_change = 0;
spin_lock_irq(&mddev->write_lock);
if (mddev->safemode &&
!atomic_read(&mddev->writes_pending) &&
!mddev->in_sync &&
mddev->recovery_cp == MaxSector) {
mddev->in_sync = 1;
did_change = 1;
if (mddev->persistent)
set_bit(MD_CHANGE_CLEAN, &mddev->flags);
}
if (mddev->safemode == 1)
mddev->safemode = 0;
spin_unlock_irq(&mddev->write_lock);
if (did_change)
sysfs_notify(&mddev->kobj, NULL, "array_state");
}
if (mddev->flags)