On Tuesday 08 Dec 2015 14:10:33 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> > --- > v2: > Make RO check mandatory for btrfs_parse_options(). > Add btrfs_show_options() support for nologreplay. > > Document for btrfs-mount(5) will follow after the patch being merged. > --- > Documentation/filesystems/btrfs.txt | 7 +++++++ > fs/btrfs/ctree.h | 4 +++- > fs/btrfs/disk-io.c | 7 ++++--- > fs/btrfs/super.c | 29 +++++++++++++++++++++++++---- > 4 files changed, 39 insertions(+), 8 deletions(-) > > diff --git a/Documentation/filesystems/btrfs.txt > b/Documentation/filesystems/btrfs.txt index c772b47..7ad5b93 100644 > --- a/Documentation/filesystems/btrfs.txt > +++ b/Documentation/filesystems/btrfs.txt > @@ -168,6 +168,13 @@ Options with (*) are default options and will not show > in the mount options. notreelog > Enable/disable the tree logging used for fsync and O_SYNC writes. > > + nologreplay > + Disable the log tree replay at mount time to prevent devices get > + modified. Must be use with 'ro' mount option. > + A filesystem mounted with the 'nologreplay' option cannot > + transition to a read-write mount via remount,rw - the filesystem > + must be unmounted and remounted if read-write access is desired. > +
May be the following is slightly better ... Disable the log tree replay at mount time to prevent filesystem from getting modified. Must be used with 'ro' mount option. A filesystem mounted with the 'nologreplay' option cannot transition to a read-write mount via remount,rw - the filesystem must be unmounted and mounted back again if read-write access is desired. Aside from above, everything else looks good to me. Reviewed-by: Chandan Rajendra <chan...@linux.vnet.ibm.com> -- chandan -- 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
