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-rw-r--r--fs/dlm/lock.c146
1 files changed, 144 insertions, 2 deletions
diff --git a/fs/dlm/lock.c b/fs/dlm/lock.c
index 09668ec2e27..ab986dfbe6d 100644
--- a/fs/dlm/lock.c
+++ b/fs/dlm/lock.c
@@ -82,10 +82,13 @@ static int send_bast(struct dlm_rsb *r, struct dlm_lkb *lkb, int mode);
static int send_lookup(struct dlm_rsb *r, struct dlm_lkb *lkb);
static int send_remove(struct dlm_rsb *r);
static int _request_lock(struct dlm_rsb *r, struct dlm_lkb *lkb);
+static int _cancel_lock(struct dlm_rsb *r, struct dlm_lkb *lkb);
static void __receive_convert_reply(struct dlm_rsb *r, struct dlm_lkb *lkb,
struct dlm_message *ms);
static int receive_extralen(struct dlm_message *ms);
static void do_purge(struct dlm_ls *ls, int nodeid, int pid);
+static void del_timeout(struct dlm_lkb *lkb);
+void dlm_timeout_warn(struct dlm_lkb *lkb);
/*
* Lock compatibilty matrix - thanks Steve
@@ -286,8 +289,17 @@ static void queue_cast(struct dlm_rsb *r, struct dlm_lkb *lkb, int rv)
if (is_master_copy(lkb))
return;
+ del_timeout(lkb);
+
DLM_ASSERT(lkb->lkb_lksb, dlm_print_lkb(lkb););
+ /* if the operation was a cancel, then return -DLM_ECANCEL, if a
+ timeout caused the cancel then return -ETIMEDOUT */
+ if (rv == -DLM_ECANCEL && (lkb->lkb_flags & DLM_IFL_TIMEOUT_CANCEL)) {
+ lkb->lkb_flags &= ~DLM_IFL_TIMEOUT_CANCEL;
+ rv = -ETIMEDOUT;
+ }
+
lkb->lkb_lksb->sb_status = rv;
lkb->lkb_lksb->sb_flags = lkb->lkb_sbflags;
@@ -581,6 +593,7 @@ static int create_lkb(struct dlm_ls *ls, struct dlm_lkb **lkb_ret)
kref_init(&lkb->lkb_ref);
INIT_LIST_HEAD(&lkb->lkb_ownqueue);
INIT_LIST_HEAD(&lkb->lkb_rsb_lookup);
+ INIT_LIST_HEAD(&lkb->lkb_time_list);
get_random_bytes(&bucket, sizeof(bucket));
bucket &= (ls->ls_lkbtbl_size - 1);
@@ -993,6 +1006,125 @@ void dlm_scan_rsbs(struct dlm_ls *ls)
}
}
+static void add_timeout(struct dlm_lkb *lkb)
+{
+ struct dlm_ls *ls = lkb->lkb_resource->res_ls;
+
+ if (is_master_copy(lkb))
+ return;
+
+ if (lkb->lkb_exflags & DLM_LKF_TIMEOUT)
+ goto add_it;
+
+ if (test_bit(LSFL_TIMEWARN, &ls->ls_flags) &&
+ !(lkb->lkb_exflags & DLM_LKF_NODLCKWT)) {
+ lkb->lkb_flags |= DLM_IFL_WATCH_TIMEWARN;
+ goto add_it;
+ }
+ return;
+
+ add_it:
+ DLM_ASSERT(list_empty(&lkb->lkb_time_list), dlm_print_lkb(lkb););
+ mutex_lock(&ls->ls_timeout_mutex);
+ hold_lkb(lkb);
+ lkb->lkb_timestamp = jiffies;
+ list_add_tail(&lkb->lkb_time_list, &ls->ls_timeout);
+ mutex_unlock(&ls->ls_timeout_mutex);
+}
+
+static void del_timeout(struct dlm_lkb *lkb)
+{
+ struct dlm_ls *ls = lkb->lkb_resource->res_ls;
+
+ mutex_lock(&ls->ls_timeout_mutex);
+ if (!list_empty(&lkb->lkb_time_list)) {
+ list_del_init(&lkb->lkb_time_list);
+ unhold_lkb(lkb);
+ }
+ mutex_unlock(&ls->ls_timeout_mutex);
+}
+
+/* FIXME: is it safe to look at lkb_exflags, lkb_flags, lkb_timestamp, and
+ lkb_lksb_timeout without lock_rsb? Note: we can't lock timeout_mutex
+ and then lock rsb because of lock ordering in add_timeout. We may need
+ to specify some special timeout-related bits in the lkb that are just to
+ be accessed under the timeout_mutex. */
+
+void dlm_scan_timeout(struct dlm_ls *ls)
+{
+ struct dlm_rsb *r;
+ struct dlm_lkb *lkb;
+ int do_cancel, do_warn;
+
+ for (;;) {
+ if (dlm_locking_stopped(ls))
+ break;
+
+ do_cancel = 0;
+ do_warn = 0;
+ mutex_lock(&ls->ls_timeout_mutex);
+ list_for_each_entry(lkb, &ls->ls_timeout, lkb_time_list) {
+
+ if ((lkb->lkb_exflags & DLM_LKF_TIMEOUT) &&
+ time_after_eq(jiffies, lkb->lkb_timestamp +
+ lkb->lkb_timeout_cs * HZ/100))
+ do_cancel = 1;
+
+ if ((lkb->lkb_flags & DLM_IFL_WATCH_TIMEWARN) &&
+ time_after_eq(jiffies, lkb->lkb_timestamp +
+ dlm_config.ci_timewarn_cs * HZ/100))
+ do_warn = 1;
+
+ if (!do_cancel && !do_warn)
+ continue;
+ hold_lkb(lkb);
+ break;
+ }
+ mutex_unlock(&ls->ls_timeout_mutex);
+
+ if (!do_cancel && !do_warn)
+ break;
+
+ r = lkb->lkb_resource;
+ hold_rsb(r);
+ lock_rsb(r);
+
+ if (do_warn) {
+ /* clear flag so we only warn once */
+ lkb->lkb_flags &= ~DLM_IFL_WATCH_TIMEWARN;
+ if (!(lkb->lkb_exflags & DLM_LKF_TIMEOUT))
+ del_timeout(lkb);
+ dlm_timeout_warn(lkb);
+ }
+
+ if (do_cancel) {
+ lkb->lkb_flags &= ~DLM_IFL_WATCH_TIMEWARN;
+ lkb->lkb_flags |= DLM_IFL_TIMEOUT_CANCEL;
+ del_timeout(lkb);
+ _cancel_lock(r, lkb);
+ }
+
+ unlock_rsb(r);
+ unhold_rsb(r);
+ dlm_put_lkb(lkb);
+ }
+}
+
+/* This is only called by dlm_recoverd, and we rely on dlm_ls_stop() stopping
+ dlm_recoverd before checking/setting ls_recover_begin. */
+
+void dlm_adjust_timeouts(struct dlm_ls *ls)
+{
+ struct dlm_lkb *lkb;
+ long adj = jiffies - ls->ls_recover_begin;
+
+ ls->ls_recover_begin = 0;
+ mutex_lock(&ls->ls_timeout_mutex);
+ list_for_each_entry(lkb, &ls->ls_timeout, lkb_time_list)
+ lkb->lkb_timestamp += adj;
+ mutex_unlock(&ls->ls_timeout_mutex);
+}
+
/* lkb is master or local copy */
static void set_lvb_lock(struct dlm_rsb *r, struct dlm_lkb *lkb)
@@ -1902,6 +2034,9 @@ static int validate_unlock_args(struct dlm_lkb *lkb, struct dlm_args *args)
if (is_overlap(lkb))
goto out;
+ /* don't let scand try to do a cancel */
+ del_timeout(lkb);
+
if (lkb->lkb_flags & DLM_IFL_RESEND) {
lkb->lkb_flags |= DLM_IFL_OVERLAP_CANCEL;
rv = -EBUSY;
@@ -1933,6 +2068,9 @@ static int validate_unlock_args(struct dlm_lkb *lkb, struct dlm_args *args)
if (is_overlap_unlock(lkb))
goto out;
+ /* don't let scand try to do a cancel */
+ del_timeout(lkb);
+
if (lkb->lkb_flags & DLM_IFL_RESEND) {
lkb->lkb_flags |= DLM_IFL_OVERLAP_UNLOCK;
rv = -EBUSY;
@@ -1993,6 +2131,7 @@ static int do_request(struct dlm_rsb *r, struct dlm_lkb *lkb)
error = -EINPROGRESS;
add_lkb(r, lkb, DLM_LKSTS_WAITING);
send_blocking_asts(r, lkb);
+ add_timeout(lkb);
goto out;
}
@@ -2040,6 +2179,7 @@ static int do_convert(struct dlm_rsb *r, struct dlm_lkb *lkb)
del_lkb(r, lkb);
add_lkb(r, lkb, DLM_LKSTS_CONVERT);
send_blocking_asts(r, lkb);
+ add_timeout(lkb);
goto out;
}
@@ -3110,9 +3250,10 @@ static void receive_request_reply(struct dlm_ls *ls, struct dlm_message *ms)
lkb->lkb_remid = ms->m_lkid;
if (is_altmode(lkb))
munge_altmode(lkb, ms);
- if (result)
+ if (result) {
add_lkb(r, lkb, DLM_LKSTS_WAITING);
- else {
+ add_timeout(lkb);
+ } else {
grant_lock_pc(r, lkb, ms);
queue_cast(r, lkb, 0);
}
@@ -3178,6 +3319,7 @@ static void __receive_convert_reply(struct dlm_rsb *r, struct dlm_lkb *lkb,
munge_demoted(lkb, ms);
del_lkb(r, lkb);
add_lkb(r, lkb, DLM_LKSTS_CONVERT);
+ add_timeout(lkb);
break;
case 0:
generated by cgit v1.2.3-18-g5258 (git 2.32.0) at 2024-11-30 15:44:07 +0000