diff options
| author | Christoph Hellwig <hch@lst.de> | 2020-08-23 11:10:42 +0200 |
|---|---|---|
| committer | Jens Axboe <axboe@kernel.dk> | 2020-09-01 16:49:25 -0600 |
| commit | c2b4bb8cb3741c0bacf3683e4c1ecd04c977ada3 (patch) | |
| tree | 1c036d3d5215adea62f0ba3534ac3c8ce5836fe4 /drivers/md | |
| parent | 611bee526b4a89d49f1b9914a770bfdc101d5fb5 (diff) | |
block: fix locking for struct block_device size updates
Two different callers use two different mutexes for updating the
block device size, which obviously doesn't help to actually protect
against concurrent updates from the different callers. In addition
one of the locks, bd_mutex is rather prone to deadlocks with other
parts of the block stack that use it for high level synchronization.
Switch to using a new spinlock protecting just the size updates, as
that is all we need, and make sure everyone does the update through
the proper helper.
This fixes a bug reported with the nvme revalidating disks during a
hot removal operation, which can currently deadlock on bd_mutex.
Reported-by: Xianting Tian <xianting_tian@126.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Sagi Grimberg <sagi@grimberg.me>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Diffstat (limited to 'drivers/md')
| -rw-r--r-- | drivers/md/dm.c | 15 |
1 files changed, 2 insertions, 13 deletions
diff --git a/drivers/md/dm.c b/drivers/md/dm.c index fb0255d25e4b..3dedd9cc4fb6 100644 --- a/drivers/md/dm.c +++ b/drivers/md/dm.c @@ -2098,18 +2098,6 @@ static void event_callback(void *context) } /* - * Protected by md->suspend_lock obtained by dm_swap_table(). - */ -static void __set_size(struct mapped_device *md, sector_t size) -{ - lockdep_assert_held(&md->suspend_lock); - - set_capacity(md->disk, size); - - i_size_write(md->bdev->bd_inode, (loff_t)size << SECTOR_SHIFT); -} - -/* * Returns old map, which caller must destroy. */ static struct dm_table *__bind(struct mapped_device *md, struct dm_table *t, @@ -2131,7 +2119,8 @@ static struct dm_table *__bind(struct mapped_device *md, struct dm_table *t, if (size != dm_get_size(md)) memset(&md->geometry, 0, sizeof(md->geometry)); - __set_size(md, size); + set_capacity(md->disk, size); + bd_set_nr_sectors(md->bdev, size); dm_table_event_callback(t, event_callback, md); |