btrfs: sysfs: protect reading label by lock

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If the label setting ioctl races with sysfs label handler, we could get
mixed result in the output, part old part new. We should either get the
old or new label. The chances to hit this race are low.

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

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David Sterba 2016-04-26 16:22:06 +02:00

parent 66ac9fe7ba

commit ee17fc8005

1 changed files with 7 additions and 1 deletions

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fs/btrfs/sysfs.c

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