File Do-not-exceed-cache-size-limit-under-pressure.patch of Package davfs2

From d171a9c68976e9fcf76d89777363acdb11bb06b3 Mon Sep 17 00:00:00 2001
From: Ali Abdallah <ali.abdallah@suse.com>
Date: Thu, 12 Mar 2026 14:23:06 +0100
Subject: [PATCH] Do not exceed cache size limit under pressure

Under pressure (rsync for example), a lot of nodes are marked as dirty
and their corresponding cache is never freed. We try with this patch to
not exceed cache size limit, even under pressure.

Fixes #31
---
 src/cache.c       | 25 ++++++++++++++++++++-----
 src/mount_davfs.c |  2 ++
 2 files changed, 22 insertions(+), 5 deletions(-)

diff --git a/src/cache.c b/src/cache.c
index ea7240a..aac3c7b 100644
--- a/src/cache.c
+++ b/src/cache.c
@@ -2920,12 +2920,16 @@ parse_index(void)
 static void
 resize_cache(void)
 {
+    int free_more_cache = 0;
+    int last = 0;
+
     if (debug)
         syslog(LOG_MAKEPRI(LOG_DAEMON, LOG_DEBUG),
                "resize cache: %llu of %llu MiBytes used.",
                (cache_size + 0x80000) / 0x100000,
                (max_cache_size + 0x80000) / 0x100000);
 
+try_once_more:
     while (1) {
         dav_node *least_recent = NULL;
         cache_size = 0;
@@ -2934,8 +2938,9 @@ resize_cache(void)
             dav_node *node = table[i];
             while (node) {
                 if (is_cached(node)) {
-                    if (!is_open(node) && !is_dirty(node)
-                            && !is_created(node) && !is_backup(node)
+                    if (!is_open(node)
+                            && (free_more_cache || !is_dirty(node))
+                            && (free_more_cache || !is_backup(node))
                             && (!least_recent
                                 || node->atime < least_recent->atime))
                         least_recent = node;
@@ -2947,15 +2952,25 @@ resize_cache(void)
         if (cache_size < max_cache_size)
             break;
         if (!least_recent) {
-            syslog(LOG_MAKEPRI(LOG_DAEMON, LOG_ERR),
-                   _("open files exceed max cache size by %llu MiBytes"),
-                   (cache_size - max_cache_size + 0x80000) / 0x100000);
+            unsigned long long oversize;
+            free_more_cache = 1;
+
+            oversize = (cache_size - max_cache_size + 0x80000) / 0x100000;
+            if (oversize)
+                syslog(LOG_MAKEPRI(LOG_DAEMON, LOG_ERR),
+                       _("open files exceed max cache size by %llu MiBytes"),
+                       (cache_size - max_cache_size + 0x80000) / 0x100000);
             break;
         }
         delete_cache_file(least_recent);
         cache_size -= least_recent->size;
     }
 
+    if (free_more_cache && !last) {
+        last = 1;
+        goto try_once_more;
+    }
+
     if (debug)
         syslog(LOG_MAKEPRI(LOG_DAEMON, LOG_DEBUG),
                "              %llu of %llu MiBytes used.",
diff --git a/src/mount_davfs.c b/src/mount_davfs.c
index ced5385..13748b0 100644
--- a/src/mount_davfs.c
+++ b/src/mount_davfs.c
@@ -275,6 +275,8 @@ main(int argc, char *argv[])
 
     dav_init_cache(args, mpoint);
 
+    dav_tidy_cache();
+
     int dev = 0;
     if (args->buf_size && args->buf_size < 64) {
         WARN("WARNING: Buffer size is too small, increasing to 64");
-- 
2.51.0