Anand Jain
2014-May-30 07:50 UTC
[PATCH] btrfs: kobject_uevent should use bd_part instead of bd_disk
From: Anand Jain <Anand.Jain@oracle.com>
reproducer 1:
mkfs.btrfs -L test /dev/sdg1
mount LABEL=test /btrfs
btrfs dev add /dev/sdg2 /btrfs
btrfs dev del /dev/sdg1 /btrfs
umount /btrfs
mount LABEL=test /btrfs
mount: special device LABEL-test1 does not exist
It does not reproduce this problem when whole disk is used.
And when newer kernel is used not sure what change in udev
is doing the trick. But in any case reproducer2 below is
more compelling.
reproducer 2:
btrfs dev del /dev/sdh2 /btrfs
ls -l /dev/sdh1 /dev/sdh2 /dev/sdh3
mtime of deleted disk is stale.
Fix it by providing bd_part for the kobject_uevent().
I have tested to confirm it doesn't break on the same thing
when whole disk is used.
Reported-by: Qu Wenruo <quwenruo@cn.fujitsu.com>
Reported-by: Tsutomu Itoh <t-itoh@jp.fujitsu.com>
Signed-off-by: Anand Jain <Anand.Jain@oracle.com>
---
fs/btrfs/volumes.c | 2 +-
1 files changed, 1 insertions(+), 1 deletions(-)
diff --git a/fs/btrfs/volumes.c b/fs/btrfs/volumes.c
index f58ea9e..1aba687 100644
--- a/fs/btrfs/volumes.c
+++ b/fs/btrfs/volumes.c
@@ -124,7 +124,7 @@ static void btrfs_kobject_uevent(struct block_device *bdev,
{
int ret;
- ret = kobject_uevent(&disk_to_dev(bdev->bd_disk)->kobj, action);
+ ret = kobject_uevent(&part_to_dev(bdev->bd_part)->kobj, action);
if (ret)
pr_warn("BTRFS: Sending event '%d' to kobject: '%s'
(%p): failed\n",
action,
--
1.7.1
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