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autofs/SOURCES/autofs-5.1.7-dont-add-offset-mounts-to-mounted-mounts-table.patch
CentOS Sources 0d112ed46f import autofs-5.1.7-24.el9
2021-12-09 11:35:07 +00:00

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autofs-5.1.7 - don't add offset mounts to mounted mounts table
From: Ian Kent <raven@themaw.net>
Multi-mount offset mounts are added to the mounted mounts table whether
they have a real mount or not. If there are a large number of offsets
this can add unnecessary overhead to the mounted mounts table processing.
Signed-off-by: Ian Kent <raven@themaw.net>
---
CHANGELOG | 1 +
daemon/direct.c | 14 ++++----------
daemon/indirect.c | 4 +++-
include/mounts.h | 2 +-
lib/mounts.c | 43 +++++++++++--------------------------------
5 files changed, 20 insertions(+), 44 deletions(-)
diff --git a/CHANGELOG b/CHANGELOG
index cb709773..b144f6aa 100644
--- a/CHANGELOG
+++ b/CHANGELOG
@@ -22,6 +22,7 @@
- remove unused mount offset list lock functions.
- eliminate count_mounts() from expire_proc_indirect().
- eliminate some strlen calls in offset handling.
+- don't add offset mounts to mounted mounts table.
25/01/2021 autofs-5.1.7
- make bind mounts propagation slave by default.
diff --git a/daemon/direct.c b/daemon/direct.c
index 311a98ba..fbfebbdd 100644
--- a/daemon/direct.c
+++ b/daemon/direct.c
@@ -605,9 +605,6 @@ force_umount:
} else
info(ap->logopt, "umounted offset mount %s", me->key);
- if (!rv)
- mnts_remove_mount(me->key, MNTS_OFFSET);
-
return rv;
}
@@ -761,12 +758,6 @@ int mount_autofs_offset(struct autofs_point *ap, struct mapent *me)
notify_mount_result(ap, me->key, timeout, str_offset);
ops->close(ap->logopt, ioctlfd);
- mnt = mnts_add_mount(ap, me->key, MNTS_OFFSET);
- if (!mnt)
- error(ap->logopt,
- "failed to add offset mount %s to mounted list",
- me->key);
-
debug(ap->logopt, "mounted trigger %s", me->key);
return MOUNT_OFFSET_OK;
@@ -1214,6 +1205,7 @@ static void *do_mount_direct(void *arg)
struct mapent *me;
struct statfs fs;
unsigned int close_fd = 0;
+ unsigned int flags = MNTS_DIRECT|MNTS_MOUNTED;
sbmnt = mnts_find_submount(mt.name);
if (statfs(mt.name, &fs) == -1 ||
@@ -1232,6 +1224,8 @@ static void *do_mount_direct(void *arg)
close_fd = 0;
if (!close_fd)
me->ioctlfd = mt.ioctlfd;
+ if (me->multi && me->multi != me)
+ flags |= MNTS_OFFSET;
}
ops->send_ready(ap->logopt, mt.ioctlfd, mt.wait_queue_token);
cache_unlock(mt.mc);
@@ -1240,7 +1234,7 @@ static void *do_mount_direct(void *arg)
info(ap->logopt, "mounted %s", mt.name);
- mnts_set_mounted_mount(ap, mt.name);
+ mnts_set_mounted_mount(ap, mt.name, flags);
conditional_alarm_add(ap, ap->exp_runfreq);
} else {
diff --git a/daemon/indirect.c b/daemon/indirect.c
index b259ebdc..eddcfff7 100644
--- a/daemon/indirect.c
+++ b/daemon/indirect.c
@@ -747,12 +747,14 @@ static void *do_mount_indirect(void *arg)
status = lookup_nss_mount(ap, NULL, mt.name, mt.len);
pthread_setcancelstate(PTHREAD_CANCEL_DISABLE, &state);
if (status) {
+ unsigned int flags = MNTS_INDIRECT|MNTS_MOUNTED;
+
ops->send_ready(ap->logopt,
ap->ioctlfd, mt.wait_queue_token);
info(ap->logopt, "mounted %s", buf);
- mnts_set_mounted_mount(ap, mt.name);
+ mnts_set_mounted_mount(ap, mt.name, flags);
conditional_alarm_add(ap, ap->exp_runfreq);
} else {
diff --git a/include/mounts.h b/include/mounts.h
index e3022b23..ac480c06 100644
--- a/include/mounts.h
+++ b/include/mounts.h
@@ -131,7 +131,7 @@ 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);
+void mnts_set_mounted_mount(struct autofs_point *ap, const char *name, unsigned int flags);
int unlink_mount_tree(struct autofs_point *ap, const char *mp);
void free_mnt_list(struct mnt_list *list);
int is_mounted(const char *mp, unsigned int type);
diff --git a/lib/mounts.c b/lib/mounts.c
index 04fe3d00..25ae2e1d 100644
--- a/lib/mounts.c
+++ b/lib/mounts.c
@@ -1172,7 +1172,7 @@ struct mnt_list *mnts_add_mount(struct autofs_point *ap,
this = mnts_get_mount(mp);
if (this) {
this->flags |= flags;
- if (list_empty(&this->mount))
+ if ((this->flags & MNTS_MOUNTED) && list_empty(&this->mount))
list_add(&this->mount, &ap->mounts);
}
mnts_hash_mutex_unlock();
@@ -1193,42 +1193,23 @@ void mnts_remove_mount(const char *mp, unsigned int flags)
this = mnts_lookup(mp);
if (this && this->flags & flags) {
this->flags &= ~flags;
- if (!(this->flags & (MNTS_OFFSET|MNTS_MOUNTED)))
+ if (!(this->flags & MNTS_MOUNTED))
list_del_init(&this->mount);
__mnts_put_mount(this);
}
mnts_hash_mutex_unlock();
}
-void mnts_set_mounted_mount(struct autofs_point *ap, const char *name)
+void mnts_set_mounted_mount(struct autofs_point *ap, const char *name, unsigned int flags)
{
struct mnt_list *mnt;
- mnt = mnts_add_mount(ap, name, MNTS_MOUNTED);
+ mnt = mnts_add_mount(ap, name, flags);
if (!mnt) {
error(ap->logopt,
"failed to add mount %s to mounted list", name);
return;
}
-
- /* Offset mount failed but non-strict returns success */
- if (mnt->flags & MNTS_OFFSET &&
- !is_mounted(mnt->mp, MNTS_REAL)) {
- mnt->flags &= ~MNTS_MOUNTED;
- mnts_put_mount(mnt);
- }
-
- /* Housekeeping.
- * Set the base type of the mounted mount.
- * MNTS_AUTOFS and MNTS_OFFSET are set at mount time and
- * are used during expire.
- */
- if (!(mnt->flags & (MNTS_AUTOFS|MNTS_OFFSET))) {
- if (ap->type == LKP_INDIRECT)
- mnt->flags |= MNTS_INDIRECT;
- else
- mnt->flags |= MNTS_DIRECT;
- }
}
unsigned int mnts_has_mounted_mounts(struct autofs_point *ap)
@@ -1947,17 +1928,13 @@ static int do_remount_direct(struct autofs_point *ap,
ret = lookup_nss_mount(ap, NULL, path, strlen(path));
if (ret) {
- struct mnt_list *mnt;
+ unsigned int flags = MNTS_DIRECT|MNTS_MOUNTED;
/* If it's an offset mount add a mount reference */
- if (type == t_offset) {
- mnt = mnts_add_mount(ap, path, MNTS_OFFSET);
- if (!mnt)
- error(ap->logopt,
- "failed to add mount %s to mounted list", path);
- }
+ if (type == t_offset)
+ flags |= MNTS_OFFSET;
- mnts_set_mounted_mount(ap, path);
+ mnts_set_mounted_mount(ap, path, flags);
info(ap->logopt, "re-connected to %s", path);
@@ -2032,7 +2009,9 @@ static int do_remount_indirect(struct autofs_point *ap, const unsigned int type,
ret = lookup_nss_mount(ap, NULL, de[n]->d_name, len);
if (ret) {
- mnts_set_mounted_mount(ap, buf);
+ unsigned int flags = MNTS_INDIRECT|MNTS_MOUNTED;
+
+ mnts_set_mounted_mount(ap, buf, flags);
info(ap->logopt, "re-connected to %s", buf);
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