btrfs: switch to RCU for device traversal in btrfs_ioctl_dev_info

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We don't need to use the mutex as we do not modify the devices nor the
list itself and just read some information:

does not change during device lifetime:
- devid
- uuid
- name (ie. the path)

may change in parallel to the ioctl call, but can lead only to reporting
inacurracy:
- bytes_used
- total_bytes

Signed-off-by: David Sterba <dsterba@suse.com>

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This commit is contained in:

David Sterba 2017-06-16 00:09:21 +02:00

parent 08ffcae8c9

commit c5593ca3c8

1 changed files with 2 additions and 5 deletions

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fs/btrfs/ioctl.c

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