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author | Bob Peterson <rpeterso@redhat.com> | 2013-09-04 20:08:02 +0400 |
---|---|---|
committer | Steven Whitehouse <swhiteho@redhat.com> | 2013-09-05 12:03:57 +0400 |
commit | 1d12d175ea3b56fdf2573bf6f168cce8f39b19e3 (patch) | |
tree | 2ab6f78a34ab951ba2a13f0c85ec637d30728c99 | |
parent | 068213f7d3378d3e33d0f1b9415b2fdc3e9efa14 (diff) | |
download | linux-1d12d175ea3b56fdf2573bf6f168cce8f39b19e3.tar.xz |
GFS2: Don't flag consistency error if first mounter is a spectator
This patch checks for the first mounter being a specator. If so, it
makes sure all the journals are clean. If there's a dirty journal,
the mount fails.
Testing results:
# insmod gfs2.ko
# mount -tgfs2 -o spectator /dev/sasdrives/scratch /mnt/gfs2
mount: permission denied
# dmesg | tail -2
[ 3390.655996] GFS2: fsid=MUSKETEER:home: Now mounting FS...
[ 3390.841336] GFS2: fsid=MUSKETEER:home.s: jid=0: Journal is dirty, so the first mounter must not be a spectator.
# mount -tgfs2 /dev/sasdrives/scratch /mnt/gfs2
# umount /mnt/gfs2
# mount -tgfs2 -o spectator /dev/sasdrives/scratch /mnt/gfs2
# ls /mnt/gfs2|wc -l
352
# umount /mnt/gfs2
Signed-off-by: Bob Peterson <rpeterso@redhat.com>
Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>
-rw-r--r-- | fs/gfs2/ops_fstype.c | 53 |
1 files changed, 51 insertions, 2 deletions
diff --git a/fs/gfs2/ops_fstype.c b/fs/gfs2/ops_fstype.c index 0262c190b6f9..19ff5e8c285c 100644 --- a/fs/gfs2/ops_fstype.c +++ b/fs/gfs2/ops_fstype.c @@ -646,6 +646,48 @@ static int gfs2_jindex_hold(struct gfs2_sbd *sdp, struct gfs2_holder *ji_gh) return error; } +/** + * check_journal_clean - Make sure a journal is clean for a spectator mount + * @sdp: The GFS2 superblock + * @jd: The journal descriptor + * + * Returns: 0 if the journal is clean or locked, else an error + */ +static int check_journal_clean(struct gfs2_sbd *sdp, struct gfs2_jdesc *jd) +{ + int error; + struct gfs2_holder j_gh; + struct gfs2_log_header_host head; + struct gfs2_inode *ip; + + ip = GFS2_I(jd->jd_inode); + error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_NOEXP | + GL_EXACT | GL_NOCACHE, &j_gh); + if (error) { + fs_err(sdp, "Error locking journal for spectator mount.\n"); + return -EPERM; + } + error = gfs2_jdesc_check(jd); + if (error) { + fs_err(sdp, "Error checking journal for spectator mount.\n"); + goto out_unlock; + } + error = gfs2_find_jhead(jd, &head); + if (error) { + fs_err(sdp, "Error parsing journal for spectator mount.\n"); + goto out_unlock; + } + if (!(head.lh_flags & GFS2_LOG_HEAD_UNMOUNT)) { + error = -EPERM; + fs_err(sdp, "jid=%u: Journal is dirty, so the first mounter " + "must not be a spectator.\n", jd->jd_jid); + } + +out_unlock: + gfs2_glock_dq_uninit(&j_gh); + return error; +} + static int init_journal(struct gfs2_sbd *sdp, int undo) { struct inode *master = sdp->sd_master_dir->d_inode; @@ -732,8 +774,15 @@ static int init_journal(struct gfs2_sbd *sdp, int undo) if (sdp->sd_lockstruct.ls_first) { unsigned int x; for (x = 0; x < sdp->sd_journals; x++) { - error = gfs2_recover_journal(gfs2_jdesc_find(sdp, x), - true); + struct gfs2_jdesc *jd = gfs2_jdesc_find(sdp, x); + + if (sdp->sd_args.ar_spectator) { + error = check_journal_clean(sdp, jd); + if (error) + goto fail_jinode_gh; + continue; + } + error = gfs2_recover_journal(jd, true); if (error) { fs_err(sdp, "error recovering journal %u: %d\n", x, error); |