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| author | Liu Bo <liubo2009@cn.fujitsu.com> | 2012-06-29 03:58:49 -0600 |
|---|---|---|
| committer | Chris Mason <chris.mason@fusionio.com> | 2012-07-23 16:27:58 -0400 |
| commit | b9ca0664dc806ba70587f6f3202b60dc736cd6e5 (patch) | |
| tree | fd40828d3af0ba3b16e1e9231c406d6a6b1bace4 /fs/btrfs/struct-funcs.c | |
| parent | e54bfa31044d602a57d4e190f6d1c3763ea76bfe (diff) | |
| download | blackbird-op-linux-b9ca0664dc806ba70587f6f3202b60dc736cd6e5.tar.gz blackbird-op-linux-b9ca0664dc806ba70587f6f3202b60dc736cd6e5.zip | |
Btrfs: do not set subvolume flags in readonly mode
$ mkfs.btrfs /dev/sdb7
$ btrfstune -S1 /dev/sdb7
$ mount /dev/sdb7 /mnt/btrfs
mount: block device /dev/sdb7 is write-protected, mounting read-only
$ btrfs dev add /dev/sdb8 /mnt/btrfs/
Now we get a btrfs in which mnt flags has readonly but sb flags does
not. So for those ioctls that only check sb flags with MS_RDONLY, it
is going to be a problem.
Setting subvolume flags is such an ioctl, we should use mnt_want_write_file()
to check RO flags.
Signed-off-by: Liu Bo <liubo2009@cn.fujitsu.com>
Diffstat (limited to 'fs/btrfs/struct-funcs.c')
0 files changed, 0 insertions, 0 deletions
