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Make sure all changes to md/dev-XX/state are notified 

The important state change happens during an interrupt
in md_error.  So just set a flag there and call sysfs_notify
later in process context.

Signed-off-by: Neil Brown <neilb@suse.de>
This commit is contained in:
Neil Brown 2008-06-28 08:31:44 +10:00
parent a99ac97113
commit 526647320e
3 changed files with 26 additions and 1 deletions
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10
Documentation/md.txt
View File

@ -297,6 +297,10 @@ Each directory contains:
writemostly - device will only be subject to read
requests if there are no other options.
This applies only to raid1 arrays.
blocked - device has failed, metadata is "external",
and the failure hasn't been acknowledged yet.
Writes that would write to this device if
it were not faulty are blocked.
spare - device is working, but not a full member.
This includes spares that are in the process
of being recovered to
@ -306,6 +310,12 @@ Each directory contains:
Writing "remove" removes the device from the array.
Writing "writemostly" sets the writemostly flag.
Writing "-writemostly" clears the writemostly flag.
Writing "blocked" sets the "blocked" flag.
Writing "-blocked" clear the "blocked" flag and allows writes
to complete.
This file responds to select/poll. Any change to 'faulty'
or 'blocked' causes an event.
errors
An approximate count of read errors that have been detected on

14
drivers/md/md.c
View File

@ -1886,6 +1886,8 @@ state_store(mdk_rdev_t *rdev, const char *buf, size_t len)
err = 0;
}
if (!err)
sysfs_notify(&rdev->kobj, NULL, "state");
return err ? err : len;
}
static struct rdev_sysfs_entry rdev_state =
@ -1979,7 +1981,8 @@ slot_store(mdk_rdev_t *rdev, const char *buf, size_t len)
if (err) {
rdev->raid_disk = -1;
return err;
}
} else
sysfs_notify(&rdev->kobj, NULL, "state");
sprintf(nm, "rd%d", rdev->raid_disk);
if (sysfs_create_link(&rdev->mddev->kobj, &rdev->kobj, nm))
printk(KERN_WARNING
@ -1996,6 +1999,7 @@ slot_store(mdk_rdev_t *rdev, const char *buf, size_t len)
clear_bit(Faulty, &rdev->flags);
clear_bit(WriteMostly, &rdev->flags);
set_bit(In_sync, &rdev->flags);
sysfs_notify(&rdev->kobj, NULL, "state");
}
return len;
}
@ -3525,6 +3529,7 @@ static int do_md_run(mddev_t * mddev)
return -EINVAL;
}
}
sysfs_notify(&rdev->kobj, NULL, "state");
}
md_probe(mddev->unit, NULL, NULL);
@ -4256,6 +4261,8 @@ static int add_new_disk(mddev_t * mddev, mdu_disk_info_t *info)
}
if (err)
export_rdev(rdev);
else
sysfs_notify(&rdev->kobj, NULL, "state");
md_update_sb(mddev, 1);
if (mddev->degraded)
@ -5115,6 +5122,7 @@ void md_error(mddev_t *mddev, mdk_rdev_t *rdev)
mddev->pers->error_handler(mddev,rdev);
if (mddev->degraded)
set_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
set_bit(StateChanged, &rdev->flags);
set_bit(MD_RECOVERY_INTR, &mddev->recovery);
set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
md_wakeup_thread(mddev->thread);
@ -6037,6 +6045,10 @@ void md_check_recovery(mddev_t *mddev)
if (mddev->flags)
md_update_sb(mddev, 0);
rdev_for_each(rdev, rtmp, mddev)
if (test_and_clear_bit(StateChanged, &rdev->flags))
sysfs_notify(&rdev->kobj, NULL, "state");
if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) &&
!test_bit(MD_RECOVERY_DONE, &mddev->recovery)) {

3
include/linux/raid/md_k.h
View File

@ -87,6 +87,9 @@ struct mdk_rdev_s
#define Blocked 8 /* An error occured on an externally
* managed array, don't allow writes
* until it is cleared */
#define StateChanged 9 /* Faulty or Blocked has changed during
* interrupt, so it needs to be
* notified by the thread */
wait_queue_head_t blocked_wait;
int desc_nr; /* descriptor index in the superblock */