On Tue, Oct 24, 2017 at 08:54:13AM -0400, Brian Foster wrote:
> On Mon, Oct 23, 2017 at 05:28:44PM -0700, Darrick J. Wong wrote:
> > Make sure the log stripe unit is sane before proceeding with mounting.
> > AFAICT this means that logsunit has to be 0, 1, or a multiple of the fs
> > block size. Found this by setting the LSB of logsunit in xfs/350 and
> > watching the system crash as soon as we try to write to the log.
> >
> > Signed-off-by: Darrick J. Wong <darrick.wong@xxxxxxxxxx>
> > ---
> > fs/xfs/xfs_log.c | 6 ++++++
> > 1 file changed, 6 insertions(+)
> >
> > diff --git a/fs/xfs/xfs_log.c b/fs/xfs/xfs_log.c
> > index d729e00..da4dcab 100644
> > --- a/fs/xfs/xfs_log.c
> > +++ b/fs/xfs/xfs_log.c
> > @@ -659,6 +659,12 @@ xfs_log_mount(
> > XFS_FSB_TO_B(mp, mp->m_sb.sb_logblocks),
> > XFS_MAX_LOG_BYTES);
> > error = -EINVAL;
> > + } else if (mp->m_sb.sb_logsunit > 1 &&
> > + mp->m_sb.sb_logsunit % mp->m_sb.sb_blocksize) {
> > + xfs_warn(mp,
> > + "log stripe unit %u bytes must be a multiple of block size",
> > + mp->m_sb.sb_logsunit);
> > + error = -EINVAL;
>
> Looks fine, but I notice that the error handling just below only fails
> the mount on v5 filesystems. Otherwise we warn and carry on. I'm not
> sure why that is.. but is this a crash vector on v4 filesystems as well?
It is a crash vector on v4 as well, so I'll be stricter about failing
the mount. I was trying to be cautious about this since there haven't
been general complaints about v4 filesystems, but ... eh. A crash is a
crash. :)
--D
>
> Brian
>
> > }
> > if (error) {
> > if (xfs_sb_version_hascrc(&mp->m_sb)) {
> > --
> > To unsubscribe from this list: send the line "unsubscribe linux-xfs" in
> > the body of a message to majordomo@xxxxxxxxxxxxxxx
> > More majordomo info at http://vger.kernel.org/majordomo-info.html
> --
> To unsubscribe from this list: send the line "unsubscribe linux-xfs" in
> the body of a message to majordomo@xxxxxxxxxxxxxxx
> More majordomo info at http://vger.kernel.org/majordomo-info.html
--
To unsubscribe from this list: send the line "unsubscribe linux-xfs" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
