diff options
Diffstat (limited to 'fs/gfs2/sys.c')
| -rw-r--r-- | fs/gfs2/sys.c | 57 |
1 files changed, 54 insertions, 3 deletions
diff --git a/fs/gfs2/sys.c b/fs/gfs2/sys.c index 6b60316ae327..ccacffd2faaa 100644 --- a/fs/gfs2/sys.c +++ b/fs/gfs2/sys.c @@ -326,6 +326,30 @@ static ssize_t lkfirst_show(struct gfs2_sbd *sdp, char *buf) return sprintf(buf, "%d\n", ls->ls_first); } +static ssize_t lkfirst_store(struct gfs2_sbd *sdp, const char *buf, size_t len) +{ + unsigned first; + int rv; + + rv = sscanf(buf, "%u", &first); + if (rv != 1 || first > 1) + return -EINVAL; + spin_lock(&sdp->sd_jindex_spin); + rv = -EBUSY; + if (test_bit(SDF_NOJOURNALID, &sdp->sd_flags) == 0) + goto out; + rv = -EINVAL; + if (sdp->sd_args.ar_spectator) + goto out; + if (sdp->sd_lockstruct.ls_ops->lm_mount == NULL) + goto out; + sdp->sd_lockstruct.ls_first = first; + rv = 0; +out: + spin_unlock(&sdp->sd_jindex_spin); + return rv ? rv : len; +} + static ssize_t first_done_show(struct gfs2_sbd *sdp, char *buf) { struct lm_lockstruct *ls = &sdp->sd_lockstruct; @@ -378,14 +402,41 @@ static ssize_t jid_show(struct gfs2_sbd *sdp, char *buf) return sprintf(buf, "%u\n", sdp->sd_lockstruct.ls_jid); } +static ssize_t jid_store(struct gfs2_sbd *sdp, const char *buf, size_t len) +{ + unsigned jid; + int rv; + + rv = sscanf(buf, "%u", &jid); + if (rv != 1) + return -EINVAL; + + spin_lock(&sdp->sd_jindex_spin); + rv = -EINVAL; + if (sdp->sd_args.ar_spectator) + goto out; + if (sdp->sd_lockstruct.ls_ops->lm_mount == NULL) + goto out; + rv = -EBUSY; + if (test_and_clear_bit(SDF_NOJOURNALID, &sdp->sd_flags) == 0) + goto out; + sdp->sd_lockstruct.ls_jid = jid; + smp_mb__after_clear_bit(); + wake_up_bit(&sdp->sd_flags, SDF_NOJOURNALID); + rv = 0; +out: + spin_unlock(&sdp->sd_jindex_spin); + return rv ? rv : len; +} + #define GDLM_ATTR(_name,_mode,_show,_store) \ static struct gfs2_attr gdlm_attr_##_name = __ATTR(_name,_mode,_show,_store) GDLM_ATTR(proto_name, 0444, proto_name_show, NULL); GDLM_ATTR(block, 0644, block_show, block_store); GDLM_ATTR(withdraw, 0644, withdraw_show, withdraw_store); -GDLM_ATTR(jid, 0444, jid_show, NULL); -GDLM_ATTR(first, 0444, lkfirst_show, NULL); +GDLM_ATTR(jid, 0644, jid_show, jid_store); +GDLM_ATTR(first, 0644, lkfirst_show, lkfirst_store); GDLM_ATTR(first_done, 0444, first_done_show, NULL); GDLM_ATTR(recover, 0600, NULL, recover_store); GDLM_ATTR(recover_done, 0444, recover_done_show, NULL); @@ -565,7 +616,7 @@ static int gfs2_uevent(struct kset *kset, struct kobject *kobj, add_uevent_var(env, "LOCKTABLE=%s", sdp->sd_table_name); add_uevent_var(env, "LOCKPROTO=%s", sdp->sd_proto_name); - if (!sdp->sd_args.ar_spectator) + if (!test_bit(SDF_NOJOURNALID, &sdp->sd_flags)) add_uevent_var(env, "JOURNALID=%u", sdp->sd_lockstruct.ls_jid); if (gfs2_uuid_valid(uuid)) add_uevent_var(env, "UUID=%pUB", uuid); |