btrfs: clean the old superblocks before freeing the device

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btrfs_rm_device frees the block device but then re-opens it using
the saved device name.  A race exists between the close and the
re-open that allows the block size to be changed.  The result
is getting stuck forever in the reclaim loop in __getblk_slow.

This patch moves the superblock cleanup before closing the block
device, which is also consistent with other callers.  We also don't
need a private copy of dev_name as the whole routine operates under
the uuid_mutex.

Signed-off-by: Jeff Mahoney <jeffm@suse.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>

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Jeff Mahoney 2016-09-20 08:50:21 -04:00 • committed by David Sterba

parent 02794222c4

commit cea67ab92d

1 changed files with 11 additions and 27 deletions

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38

fs/btrfs/volumes.c

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