Qu Wenruo posted on Wed, 16 Dec 2015 09:36:23 +0800 as excerpted: > David Sterba wrote on 2015/12/14 18:32 +0100: >> 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 <quwen...@cn.fujitsu.com> >>> Reviewed-by: Chandan Rajendra <chan...@linux.vnet.ibm.com> >>> Tested-by: Austin S. Hemmelgarn <ahferro...@gmail.com> >> >> 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. >> >> mount -o ro,nowr /dev/sdx /mnt >> >> would work when switching kernels. >> >> > That would be nice. > > I'd like to forward the idea/discussion to filesystem ml, not only btrfs > maillist. > > Such behavior should better be coordinated between all(at least xfs and > ext4 and btrfs) filesystems. > > One sad example is, we can't use 'norecovery' mount option to disable > log replay in btrfs, as there is 'recovery' mount option already. > > So I hope we can have a unified mount option between mainline > filesystems.
FWIW, I was just reading the mount manpage in connection with a reply for a different thread, and noticed... mount (8) (from util-linux 2.27.1) says noload and norecovery are the same option, for ext3/4 at least. It refers to the xfs (5) manpage, from xfsprogs, for xfs mount options, and that's not installed here, so I can't confirm noload for it, but it's there for ext3/4. And noload doesn't have the namespace collision problem norecovery does on btrfs, so I'd strongly suggest using it, at least as an alias for whatever other btrfs-specific name we might choose. -- Duncan - List replies preferred. No HTML msgs. "Every nonfree program has a lord, a master -- and if you use the program, he is your master." Richard Stallman -- To unsubscribe from this list: send the line "unsubscribe linux-btrfs" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
