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autofs-5.1.6 - only add expire alarm for active mounts
From: Ian Kent <raven@themaw.net>
There's no need to add expire alarms for mount points that have no
expirable mounts.
Signed-off-by: Ian Kent <raven@themaw.net>
---
CHANGELOG | 1
daemon/automount.c | 9 +-------
daemon/direct.c | 3 ++
daemon/indirect.c | 3 ++
daemon/state.c | 25 +++++++++++-----------
include/automount.h | 1
include/mounts.h | 1
lib/alarm.c | 57 ++++++++++++++++++++++++++++++++++++++++++++++++----
lib/mounts.c | 19 +++++++++++++++++
9 files changed, 96 insertions(+), 23 deletions(-)
--- autofs-5.1.4.orig/CHANGELOG
+++ autofs-5.1.4/CHANGELOG
@@ -131,6 +131,7 @@ xx/xx/2018 autofs-5.1.5
- use struct mnt_list to track mounted mounts.
- use struct mnt_list mounted list for expire.
- remove unused function tree_get_mnt_list().
+- only add expre alarm for active mounts.
19/12/2017 autofs-5.1.4
- fix spec file url.
--- autofs-5.1.4.orig/daemon/automount.c
+++ autofs-5.1.4/daemon/automount.c
@@ -1844,7 +1844,7 @@ int handle_mounts_exit(struct autofs_poi
if (ap->state != ST_SHUTDOWN) {
if (!ap->submount)
- alarm_add(ap, ap->exp_runfreq);
+ conditional_alarm_add(ap, ap->exp_runfreq);
/* Return to ST_READY is done immediately */
st_add_task(ap, ST_READY);
if (ap->submount)
@@ -1889,7 +1889,7 @@ int handle_mounts_exit(struct autofs_poi
/* Failed shutdown returns to ready */
warn(ap->logopt, "can't shutdown: filesystem %s still busy", ap->path);
if (!ap->submount)
- alarm_add(ap, ap->exp_runfreq);
+ conditional_alarm_add(ap, ap->exp_runfreq);
/* Return to ST_READY is done immediately */
st_add_task(ap, ST_READY);
if (ap->submount)
@@ -1952,11 +1952,6 @@ void *handle_mounts(void *arg)
suc->status = 0;
pthread_cleanup_pop(1);
- /* We often start several automounters at the same time. Add some
- randomness so we don't all expire at the same time. */
- if (!ap->submount && ap->exp_runfreq)
- alarm_add(ap, ap->exp_runfreq + rand() % ap->exp_runfreq);
-
pthread_setcancelstate(cancel_state, NULL);
while (1) {
--- autofs-5.1.4.orig/daemon/direct.c
+++ autofs-5.1.4/daemon/direct.c
@@ -1245,6 +1245,9 @@ static void *do_mount_direct(void *arg)
info(ap->logopt, "mounted %s", mt.name);
mnts_set_mounted_mount(ap, mt.name);
+
+ if (!ap->submount)
+ conditional_alarm_add(ap, ap->exp_runfreq);
} else {
/* TODO: get mount return status from lookup_nss_mount */
ops->send_fail(ap->logopt,
--- autofs-5.1.4.orig/daemon/indirect.c
+++ autofs-5.1.4/daemon/indirect.c
@@ -753,6 +753,9 @@ static void *do_mount_indirect(void *arg
info(ap->logopt, "mounted %s", buf);
mnts_set_mounted_mount(ap, mt.name);
+
+ if (!ap->submount)
+ conditional_alarm_add(ap, ap->exp_runfreq);
} else {
/* TODO: get mount return status from lookup_nss_mount */
ops->send_fail(ap->logopt,
--- autofs-5.1.4.orig/daemon/state.c
+++ autofs-5.1.4/daemon/state.c
@@ -155,7 +155,7 @@ void expire_cleanup(void *arg)
ap->submount = 1;
if (ap->state == ST_EXPIRE && !ap->submount)
- alarm_add(ap, ap->exp_runfreq);
+ conditional_alarm_add(ap, ap->exp_runfreq);
/* FALLTHROUGH */
@@ -173,7 +173,7 @@ void expire_cleanup(void *arg)
if (!rv && !idle && !ap->shutdown) {
next = ST_READY;
if (!ap->submount)
- alarm_add(ap, ap->exp_runfreq);
+ conditional_alarm_add(ap, ap->exp_runfreq);
break;
}
@@ -187,7 +187,7 @@ void expire_cleanup(void *arg)
/* Failed shutdown returns to ready */
warn(ap->logopt, "filesystem %s still busy", ap->path);
if (!ap->submount)
- alarm_add(ap, ap->exp_runfreq);
+ conditional_alarm_add(ap, ap->exp_runfreq);
next = ST_READY;
break;
#endif
@@ -522,9 +522,10 @@ static void *do_readmap(void *arg)
* alarm will have been added. So add it here if there are
* now map entries.
*/
- if (append_alarm && ap->exp_runfreq)
- alarm_add(ap, ap->exp_runfreq +
- rand() % ap->exp_runfreq);
+ if (append_alarm && ap->exp_runfreq) {
+ time_t seconds = ap->exp_runfreq + rand() % ap->exp_runfreq;
+ conditional_alarm_add(ap, seconds);
+ }
pthread_cleanup_pop(1);
pthread_cleanup_pop(1);
@@ -577,7 +578,7 @@ static unsigned int st_readmap(struct au
/* It didn't work: return to ready */
st_ready(ap);
if (!ap->submount)
- alarm_add(ap, ap->exp_runfreq);
+ conditional_alarm_add(ap, ap->exp_runfreq);
return 0;
}
@@ -604,7 +605,7 @@ static unsigned int st_readmap(struct au
/* It didn't work: return to ready */
st_ready(ap);
if (!ap->submount)
- alarm_add(ap, ap->exp_runfreq);
+ conditional_alarm_add(ap, ap->exp_runfreq);
return 0;
}
ap->readmap_thread = thid;
@@ -640,7 +641,7 @@ static unsigned int st_prepare_shutdown(
case EXP_PARTIAL:
/* It didn't work: return to ready */
if (!ap->submount)
- alarm_add(ap, ap->exp_runfreq);
+ conditional_alarm_add(ap, ap->exp_runfreq);
st_ready(ap);
return 0;
@@ -666,7 +667,7 @@ static unsigned int st_force_shutdown(st
case EXP_PARTIAL:
/* It didn't work: return to ready */
if (!ap->submount)
- alarm_add(ap, ap->exp_runfreq);
+ conditional_alarm_add(ap, ap->exp_runfreq);
st_ready(ap);
return 0;
@@ -699,7 +700,7 @@ static unsigned int st_prune(struct auto
case EXP_ERROR:
case EXP_PARTIAL:
if (!ap->submount)
- alarm_add(ap, ap->exp_runfreq);
+ conditional_alarm_add(ap, ap->exp_runfreq);
st_ready(ap);
return 0;
@@ -720,7 +721,7 @@ static unsigned int st_expire(struct aut
case EXP_ERROR:
case EXP_PARTIAL:
if (!ap->submount)
- alarm_add(ap, ap->exp_runfreq);
+ conditional_alarm_add(ap, ap->exp_runfreq);
st_ready(ap);
return 0;
--- autofs-5.1.4.orig/include/automount.h
+++ autofs-5.1.4/include/automount.h
@@ -637,6 +637,7 @@ static inline time_t monotonic_time(time
/* Expire alarm handling routines */
int alarm_start_handler(void);
int alarm_add(struct autofs_point *ap, time_t seconds);
+int conditional_alarm_add(struct autofs_point *ap, time_t seconds);
void alarm_delete(struct autofs_point *ap);
#endif
--- autofs-5.1.4.orig/include/mounts.h
+++ autofs-5.1.4/include/mounts.h
@@ -125,6 +125,7 @@ void mnts_remove_amdmount(const char *mp
struct mnt_list *mnts_add_mount(struct autofs_point *ap, const char *name, unsigned int flags);
void mnts_remove_mount(const char *mp, unsigned int flags);
struct mnt_list *get_mnt_list(const char *path, int include);
+unsigned int mnts_has_mounted_mounts(struct autofs_point *ap);
void mnts_get_expire_list(struct list_head *mnts, struct autofs_point *ap);
void mnts_put_expire_list(struct list_head *mnts);
void mnts_set_mounted_mount(struct autofs_point *ap, const char *name);
--- autofs-5.1.4.orig/lib/alarm.c
+++ autofs-5.1.4/lib/alarm.c
@@ -41,7 +41,7 @@ do { \
} while (0)
/* Insert alarm entry on ordered list. */
-int alarm_add(struct autofs_point *ap, time_t seconds)
+int __alarm_add(struct autofs_point *ap, time_t seconds)
{
struct list_head *head;
struct list_head *p;
@@ -62,8 +62,6 @@ int alarm_add(struct autofs_point *ap, t
new->cancel = 0;
new->time = now + seconds;
- alarm_lock();
-
head = &alarms;
/* Check if we have a pending alarm */
@@ -97,9 +95,42 @@ int alarm_add(struct autofs_point *ap, t
fatal(status);
}
+ return 1;
+}
+
+int alarm_add(struct autofs_point *ap, time_t seconds)
+{
+ int status;
+
+ alarm_lock();
+ status = __alarm_add(ap, seconds);
alarm_unlock();
- return 1;
+ return status;
+}
+
+static int __alarm_exists(struct autofs_point *ap)
+{
+ struct list_head *head;
+ struct list_head *p;
+
+ head = &alarms;
+
+ if (list_empty(head))
+ return 0;
+
+ p = head->next;
+ while (p != head) {
+ struct alarm *this;
+
+ this = list_entry(p, struct alarm, list);
+ p = p->next;
+
+ if (ap == this->ap)
+ return 1;
+ }
+
+ return 0;
}
void alarm_delete(struct autofs_point *ap)
@@ -152,6 +183,24 @@ void alarm_delete(struct autofs_point *a
return;
}
+int conditional_alarm_add(struct autofs_point *ap, time_t seconds)
+{
+ int status;
+
+ if (!mnts_has_mounted_mounts(ap))
+ return 1;
+
+ alarm_lock();
+ if (__alarm_exists(ap)) {
+ alarm_unlock();
+ return 1;
+ }
+ status = __alarm_add(ap, seconds);
+ alarm_unlock();
+
+ return status;
+}
+
static void *alarm_handler(void *arg)
{
struct list_head *head;
--- autofs-5.1.4.orig/lib/mounts.c
+++ autofs-5.1.4/lib/mounts.c
@@ -1208,6 +1208,19 @@ void mnts_set_mounted_mount(struct autof
}
}
+unsigned int mnts_has_mounted_mounts(struct autofs_point *ap)
+{
+ unsigned int has_mounted_mounts = 0;
+
+ mnts_hash_mutex_lock();
+ if (list_empty(&ap->mounts))
+ goto done;
+ has_mounted_mounts = 1;
+done:
+ mnts_hash_mutex_unlock();
+ return has_mounted_mounts;
+}
+
struct node {
struct mnt_list *mnt;
struct node *left;
@@ -1907,6 +1920,9 @@ static int do_remount_direct(struct auto
mnts_set_mounted_mount(ap, path);
info(ap->logopt, "re-connected to %s", path);
+
+ if (!ap->submount)
+ conditional_alarm_add(ap, ap->exp_runfreq);
} else {
status = REMOUNT_FAIL;
info(ap->logopt, "failed to re-connect %s", path);
@@ -1980,6 +1996,9 @@ static int do_remount_indirect(struct au
mnts_set_mounted_mount(ap, buf);
info(ap->logopt, "re-connected to %s", buf);
+
+ if (!ap->submount)
+ conditional_alarm_add(ap, ap->exp_runfreq);
} else {
status = REMOUNT_FAIL;
info(ap->logopt, "failed to re-connect %s", buf);
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