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| author | Hannes Reinecke <hare@suse.de> | 2009-07-28 09:13:13 +0200 |
|---|---|---|
| committer | Jens Axboe <jens.axboe@oracle.com> | 2009-09-11 14:33:31 +0200 |
| commit | e3264a4d7de147677f1995f119eba05c9abe9c1c (patch) | |
| tree | 151047f3598583556194262a5b07c75ca3b4781d /block | |
| parent | d58b85e1e891cd842d6e183f5d94d06a4fd0122c (diff) | |
| download | lwn-e3264a4d7de147677f1995f119eba05c9abe9c1c.tar.gz lwn-e3264a4d7de147677f1995f119eba05c9abe9c1c.zip | |
Send uevents for write_protect changes
Whenever a block device changes it's read-only attribute
notify the userspace about it.
Signed-off-by: Hannes Reinecke <hare@suse.de>
Signed-off-by: Nikanth Karthikesan <knikanth@suse.de>
Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
Diffstat (limited to 'block')
| -rw-r--r-- | block/genhd.c | 18 |
1 files changed, 16 insertions, 2 deletions
diff --git a/block/genhd.c b/block/genhd.c index f4c64c2b303a..b89328eceee2 100644 --- a/block/genhd.c +++ b/block/genhd.c @@ -1215,6 +1215,16 @@ void put_disk(struct gendisk *disk) EXPORT_SYMBOL(put_disk); +static void set_disk_ro_uevent(struct gendisk *gd, int ro) +{ + char event[] = "DISK_RO=1"; + char *envp[] = { event, NULL }; + + if (!ro) + event[8] = '0'; + kobject_uevent_env(&disk_to_dev(gd)->kobj, KOBJ_CHANGE, envp); +} + void set_device_ro(struct block_device *bdev, int flag) { bdev->bd_part->policy = flag; @@ -1227,8 +1237,12 @@ void set_disk_ro(struct gendisk *disk, int flag) struct disk_part_iter piter; struct hd_struct *part; - disk_part_iter_init(&piter, disk, - DISK_PITER_INCL_EMPTY | DISK_PITER_INCL_PART0); + if (disk->part0.policy != flag) { + set_disk_ro_uevent(disk, flag); + disk->part0.policy = flag; + } + + disk_part_iter_init(&piter, disk, DISK_PITER_INCL_EMPTY); while ((part = disk_part_iter_next(&piter))) part->policy = flag; disk_part_iter_exit(&piter); |