Btrfs: drop unnecessary device lock

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Drop device_list_mutex for the reader side  on clone_fs_devices and
btrfs_rm_device pathes since the fs_info->volume_mutex can ensure the device
list is not updated

btrfs_close_extra_devices is the initialized path, we can not add or remove
device at this time, so we can simply drop the mutex safely, like other
initialized function does(add_missing_dev, __find_device, __btrfs_open_devices
...).

Signed-off-by: Xiao Guangrong <xiaoguangrong@cn.fujitsu.com>
Signed-off-by: Chris Mason <chris.mason@oracle.com>

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Xiao Guangrong 2011-04-20 10:08:47 +00:00 • committed by Chris Mason

parent 0c1daee085

commit 4622470565

1 changed files with 6 additions and 7 deletions

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fs/btrfs/volumes.c

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