autofs/autofs-5.1.6-use-a-valid-timeout-in-lookup_prune_one_cache.patch

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autofs-5.1.6 - use a valid timeout in lookup_prune_one_cache()
From: Ian Kent <raven@themaw.net>
For a very long time the map entry cache has been allowed to grow
without pruning old entries until a map read is needed and there's
been a constant struggle to set the map stale only when really needed
so that in use entries aren't pruned.
But somewhere along the line that's become broken and the sss error
handling updates don't work properly because of this (or rather don't
work well).
Add a positive map entry cache timeout so that recently seen map
entries don't get removed in the map read following the lookup that
added them when the map isn't actually read such as with nobrowse
indirect mounts.
The valid timeout probably should become configurable at some point
too.
Signed-off-by: Ian Kent <raven@themaw.net>
---
CHANGELOG | 1 +
daemon/lookup.c | 15 +++++++++++++++
include/automount.h | 1 +
3 files changed, 17 insertions(+)
diff --git a/CHANGELOG b/CHANGELOG
index 309def2..3608345 100644
--- a/CHANGELOG
+++ b/CHANGELOG
@@ -108,6 +108,7 @@ xx/xx/2018 autofs-5.1.5
- update sss timeout documentation.
- refactor sss getautomntbyname().
- improve sss getautomntbyname() error handling.
+- use a valid timeout in lookup_prune_one_cache().
19/12/2017 autofs-5.1.4
- fix spec file url.
diff --git a/daemon/lookup.c b/daemon/lookup.c
index 2b9c7e8..8bf1335 100644
--- a/daemon/lookup.c
+++ b/daemon/lookup.c
@@ -1354,6 +1354,21 @@ void lookup_prune_one_cache(struct autofs_point *ap, struct mapent_cache *mc, ti
continue;
}
+ if (ap->type == LKP_INDIRECT) {
+ /* If the map hasn't been read (nobrowse
+ * indirect mounts) then keep cached entries
+ * for POSITIVE_TIMEOUT.
+ */
+ if (!(ap->flags & (MOUNT_FLAG_GHOST |
+ MOUNT_FLAG_AMD_CACHE_ALL))) {
+ time_t until = me->age + POSITIVE_TIMEOUT;
+ if ((long) age - (long) until < 0) {
+ me = cache_enumerate(mc, me);
+ continue;
+ }
+ }
+ }
+
key = strdup(me->key);
me = cache_enumerate(mc, me);
/* Don't consider any entries with a wildcard */
diff --git a/include/automount.h b/include/automount.h
index 49c9ff9..bb264a1 100644
--- a/include/automount.h
+++ b/include/automount.h
@@ -139,6 +139,7 @@ struct autofs_point;
#define NULL_MAP_HASHSIZE 64
#define NEGATIVE_TIMEOUT 10
+#define POSITIVE_TIMEOUT 120
#define UMOUNT_RETRIES 8
#define EXPIRE_RETRIES 3