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authorHannes Reinecke <hare@suse.de>2009-07-28 03:13:13 -0400
committerJens Axboe <jens.axboe@oracle.com>2009-09-11 08:33:31 -0400
commite3264a4d7de147677f1995f119eba05c9abe9c1c (patch)
tree151047f3598583556194262a5b07c75ca3b4781d /block
parentd58b85e1e891cd842d6e183f5d94d06a4fd0122c (diff)
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.c18
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)
1215 1215
1216EXPORT_SYMBOL(put_disk); 1216EXPORT_SYMBOL(put_disk);
1217 1217
1218static void set_disk_ro_uevent(struct gendisk *gd, int ro)
1219{
1220 char event[] = "DISK_RO=1";
1221 char *envp[] = { event, NULL };
1222
1223 if (!ro)
1224 event[8] = '0';
1225 kobject_uevent_env(&disk_to_dev(gd)->kobj, KOBJ_CHANGE, envp);
1226}
1227
1218void set_device_ro(struct block_device *bdev, int flag) 1228void set_device_ro(struct block_device *bdev, int flag)
1219{ 1229{
1220 bdev->bd_part->policy = flag; 1230 bdev->bd_part->policy = flag;
@@ -1227,8 +1237,12 @@ void set_disk_ro(struct gendisk *disk, int flag)
1227 struct disk_part_iter piter; 1237 struct disk_part_iter piter;
1228 struct hd_struct *part; 1238 struct hd_struct *part;
1229 1239
1230 disk_part_iter_init(&piter, disk, 1240 if (disk->part0.policy != flag) {
1231 DISK_PITER_INCL_EMPTY | DISK_PITER_INCL_PART0); 1241 set_disk_ro_uevent(disk, flag);
1242 disk->part0.policy = flag;
1243 }
1244
1245 disk_part_iter_init(&piter, disk, DISK_PITER_INCL_EMPTY);
1232 while ((part = disk_part_iter_next(&piter))) 1246 while ((part = disk_part_iter_next(&piter)))
1233 part->policy = flag; 1247 part->policy = flag;
1234 disk_part_iter_exit(&piter); 1248 disk_part_iter_exit(&piter);