diff options
| author | Tejun Heo <tj@kernel.org> | 2011-01-14 18:43:57 +0100 |
|---|---|---|
| committer | Jens Axboe <jaxboe@fusionio.com> | 2011-01-14 18:44:22 +0100 |
| commit | 49731baa41df404c2c3f44555869ab387363af43 (patch) | |
| tree | 5d3476368fa546aebb1c223e9cf1bab5ad80f698 /drivers/md | |
| parent | c553f8e335c00a7cff3ab3f13e793b13d3f2207f (diff) | |
| download | linux-stable-49731baa41df404c2c3f44555869ab387363af43.tar.gz linux-stable-49731baa41df404c2c3f44555869ab387363af43.tar.bz2 linux-stable-49731baa41df404c2c3f44555869ab387363af43.zip | |
block: restore multiple bd_link_disk_holder() support
Commit e09b457b (block: simplify holder symlink handling) incorrectly
assumed that there is only one link at maximum. dm may use multiple
links and expects block layer to track reference count for each link,
which is different from and unrelated to the exclusive device holder
identified by @holder when the device is opened.
Remove the single holder assumption and automatic removal of the link
and revive the per-link reference count tracking. The code
essentially behaves the same as before commit e09b457b sans the
unnecessary kobject reference count dancing.
While at it, note that this facility should not be used by anyone else
than the current ones. Sysfs symlinks shouldn't be abused like this
and the whole thing doesn't belong in the block layer at all.
Signed-off-by: Tejun Heo <tj@kernel.org>
Reported-by: Milan Broz <mbroz@redhat.com>
Cc: Jun'ichi Nomura <j-nomura@ce.jp.nec.com>
Cc: Neil Brown <neilb@suse.de>
Cc: linux-raid@vger.kernel.org
Cc: Kay Sievers <kay.sievers@vrfy.org>
Signed-off-by: Jens Axboe <jaxboe@fusionio.com>
Diffstat (limited to 'drivers/md')
| -rw-r--r-- | drivers/md/dm-table.c | 1 | ||||
| -rw-r--r-- | drivers/md/md.c | 1 |
2 files changed, 2 insertions, 0 deletions
diff --git a/drivers/md/dm-table.c b/drivers/md/dm-table.c index dffa0ac7c4f0..38e4eb1bb965 100644 --- a/drivers/md/dm-table.c +++ b/drivers/md/dm-table.c @@ -350,6 +350,7 @@ static void close_dev(struct dm_dev_internal *d, struct mapped_device *md) if (!d->dm_dev.bdev) return; + bd_unlink_disk_holder(d->dm_dev.bdev, dm_disk(md)); blkdev_put(d->dm_dev.bdev, d->dm_dev.mode | FMODE_EXCL); d->dm_dev.bdev = NULL; } diff --git a/drivers/md/md.c b/drivers/md/md.c index cf8594c5ea21..b76cfc89e1b5 100644 --- a/drivers/md/md.c +++ b/drivers/md/md.c @@ -1912,6 +1912,7 @@ static void unbind_rdev_from_array(mdk_rdev_t * rdev) MD_BUG(); return; } + bd_unlink_disk_holder(rdev->bdev, rdev->mddev->gendisk); list_del_rcu(&rdev->same_set); printk(KERN_INFO "md: unbind<%s>\n", bdevname(rdev->bdev,b)); rdev->mddev = NULL; |