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md: use sysfs_notify_dirent to notify changes to md/array_state 

Now that we have sysfs_notify_dirent, use it to notify changes
to md/array_state.
As sysfs_notify_dirent can be called in atomic context, we can
remove the delayed notify and the MD_NOTIFY_ARRAY_STATE flag.

Signed-off-by: NeilBrown <neilb@suse.de>
This commit is contained in:
NeilBrown 2008-10-21 13:25:21 +11:00
parent 0cfd81031a
commit b62b75905d
2 changed files with 20 additions and 15 deletions
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30
drivers/md/md.c
View File

@ -222,6 +222,9 @@ static void mddev_put(mddev_t *mddev)
list_del(&mddev->all_mddevs);
spin_unlock(&all_mddevs_lock);
blk_cleanup_queue(mddev->queue);
if (mddev->sysfs_state)
sysfs_put(mddev->sysfs_state);
mddev->sysfs_state = NULL;
kobject_put(&mddev->kobj);
} else
spin_unlock(&all_mddevs_lock);
@ -2770,7 +2773,7 @@ array_state_store(mddev_t *mddev, const char *buf, size_t len)
if (err)
return err;
else {
sysfs_notify(&mddev->kobj, NULL, "array_state");
sysfs_notify_dirent(mddev->sysfs_state);
return len;
}
}
@ -3465,8 +3468,10 @@ static struct kobject *md_probe(dev_t dev, int *part, void *data)
if (error)
printk(KERN_WARNING "md: cannot register %s/md - name in use\n",
disk->disk_name);
else
else {
kobject_uevent(&mddev->kobj, KOBJ_ADD);
mddev->sysfs_state = sysfs_get_dirent(mddev->kobj.sd, "array_state");
}
return NULL;
}
@ -3477,7 +3482,7 @@ static void md_safemode_timeout(unsigned long data)
if (!atomic_read(&mddev->writes_pending)) {
mddev->safemode = 1;
if (mddev->external)
set_bit(MD_NOTIFY_ARRAY_STATE, &mddev->flags);
sysfs_notify_dirent(mddev->sysfs_state);
}
md_wakeup_thread(mddev->thread);
}
@ -3740,7 +3745,7 @@ static int do_md_run(mddev_t * mddev)
mddev->changed = 1;
md_new_event(mddev);
sysfs_notify(&mddev->kobj, NULL, "array_state");
sysfs_notify_dirent(mddev->sysfs_state);
sysfs_notify(&mddev->kobj, NULL, "sync_action");
sysfs_notify(&mddev->kobj, NULL, "degraded");
kobject_uevent(&disk_to_dev(mddev->gendisk)->kobj, KOBJ_CHANGE);
@ -3767,7 +3772,7 @@ static int restart_array(mddev_t *mddev)
set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
md_wakeup_thread(mddev->thread);
md_wakeup_thread(mddev->sync_thread);
sysfs_notify(&mddev->kobj, NULL, "array_state");
sysfs_notify_dirent(mddev->sysfs_state);
return 0;
}
@ -3847,7 +3852,7 @@ static int do_md_stop(mddev_t * mddev, int mode, int is_open)
module_put(mddev->pers->owner);
mddev->pers = NULL;
/* tell userspace to handle 'inactive' */
sysfs_notify(&mddev->kobj, NULL, "array_state");
sysfs_notify_dirent(mddev->sysfs_state);
set_capacity(disk, 0);
mddev->changed = 1;
@ -3933,7 +3938,7 @@ static int do_md_stop(mddev_t * mddev, int mode, int is_open)
mdname(mddev));
err = 0;
md_new_event(mddev);
sysfs_notify(&mddev->kobj, NULL, "array_state");
sysfs_notify_dirent(mddev->sysfs_state);
out:
return err;
}
@ -4938,7 +4943,7 @@ static int md_ioctl(struct inode *inode, struct file *file,
if (_IOC_TYPE(cmd) == MD_MAJOR && mddev->ro && mddev->pers) {
if (mddev->ro == 2) {
mddev->ro = 0;
sysfs_notify(&mddev->kobj, NULL, "array_state");
sysfs_notify_dirent(mddev->sysfs_state);
set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
md_wakeup_thread(mddev->thread);
} else {
@ -5612,7 +5617,7 @@ void md_write_start(mddev_t *mddev, struct bio *bi)
spin_unlock_irq(&mddev->write_lock);
}
if (did_change)
sysfs_notify(&mddev->kobj, NULL, "array_state");
sysfs_notify_dirent(mddev->sysfs_state);
wait_event(mddev->sb_wait,
!test_bit(MD_CHANGE_CLEAN, &mddev->flags) &&
!test_bit(MD_CHANGE_PENDING, &mddev->flags));
@ -5655,7 +5660,7 @@ int 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");
sysfs_notify_dirent(mddev->sysfs_state);
} else
spin_unlock_irq(&mddev->write_lock);
@ -6048,9 +6053,6 @@ void md_check_recovery(mddev_t *mddev)
if (mddev->bitmap)
bitmap_daemon_work(mddev->bitmap);
if (test_and_clear_bit(MD_NOTIFY_ARRAY_STATE, &mddev->flags))
sysfs_notify(&mddev->kobj, NULL, "array_state");
if (mddev->ro)
return;
@ -6103,7 +6105,7 @@ void md_check_recovery(mddev_t *mddev)
mddev->safemode = 0;
spin_unlock_irq(&mddev->write_lock);
if (did_change)
sysfs_notify(&mddev->kobj, NULL, "array_state");
sysfs_notify_dirent(mddev->sysfs_state);
}
if (mddev->flags)

5
include/linux/raid/md_k.h
View File

@ -128,7 +128,6 @@ struct mddev_s
#define MD_CHANGE_DEVS 0 /* Some device status has changed */
#define MD_CHANGE_CLEAN 1 /* transition to or from 'clean' */
#define MD_CHANGE_PENDING 2 /* superblock update in progress */
#define MD_NOTIFY_ARRAY_STATE 3 /* atomic context wants to notify userspace */
int ro;
@ -239,6 +238,10 @@ struct mddev_s
sector_t resync_max; /* resync should pause
* when it gets here */
struct sysfs_dirent *sysfs_state; /* handle for 'array_state'
* file in sysfs.
*/
spinlock_t write_lock;
wait_queue_head_t sb_wait; /* for waiting on superblock updates */
atomic_t pending_writes; /* number of active superblock writes */