On 2015-12-14 12:32, David Sterba wrote:
On Thu, Dec 10, 2015 at 10:34:06AM +0800, Qu Wenruo wrote:
Introduce a new mount option "nologreplay" to co-operate with "ro" mount
option to get real readonly mount, like "norecovery" in ext* and xfs.
Since the new parse_options() need to check new flags at remount time,
so add a new parameter for parse_options().
Signed-off-by: Qu Wenruo <quwenruo@xxxxxxxxxxxxxx>
Reviewed-by: Chandan Rajendra <chandan@xxxxxxxxxxxxxxxxxx>
Tested-by: Austin S. Hemmelgarn <ahferroin7@xxxxxxxxx>
I've read the discussions around the change and from the user's POV I'd
suggest to add another mount option that would be just an alias for any
mount options that would implement the 'hard-ro' semantics.
Say it's called 'nowr'. Now it would imply 'nologreplay', but may cover
more options in the future.
It should also imply noatime. I'm not sure how BTRFS handles atime when
mounted RO, but I know a lot of old UNIX systems updated atime even on
filesystems mounted RO, and I know that at least at one point Linux did too.
mount -o ro,nowr /dev/sdx /mnt
would work when switching kernels.
I like this idea, but I think that having a name like true-ro or hard-ro
and making it imply ro (and noatime) would probably be better (or at
least, simpler to use from a user perspective).
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