Commit 15bbf82857fa for kernel

commit 15bbf82857fa61de9bad9faa7a3cf3a95b1b292a
Author: Remi Pommarel <repk@triplefau.lt>
Date:   Thu May 21 11:40:31 2026 +0200

    9p: Set default negative dentry retention time for cache=loose

    For cache=loose mounts, set the default negative dentry cache retention
    time to 24 hours.

    Signed-off-by: Remi Pommarel <repk@triplefau.lt>
    Message-ID: <b5beca3e70890ab8a4f0b9e99bd69cb97f5cb9eb.1779355927.git.repk@triplefau.lt>
    Signed-off-by: Dominique Martinet <asmadeus@codewreck.org>

diff --git a/fs/9p/v9fs.c b/fs/9p/v9fs.c
index 3e758b66fefa..274c5157135d 100644
--- a/fs/9p/v9fs.c
+++ b/fs/9p/v9fs.c
@@ -24,6 +24,9 @@
 #include "v9fs_vfs.h"
 #include "cache.h"

+/* cache=loose default negative dentry retention time is 24hours */
+#define CACHE_LOOSE_NDENTRY_TIMEOUT_DEFAULT (24 * 60 * 60 * 1000)
+
 static DEFINE_SPINLOCK(v9fs_sessionlist_lock);
 static LIST_HEAD(v9fs_sessionlist);
 struct kmem_cache *v9fs_inode_cache;
@@ -441,6 +444,13 @@ static void v9fs_apply_options(struct v9fs_session_info *v9ses,
 	v9ses->uid = ctx->session_opts.uid;
 	v9ses->session_lock_timeout = ctx->session_opts.session_lock_timeout;
 	v9ses->ndentry_timeout_ms = ctx->session_opts.ndentry_timeout_ms;
+
+	/* If negative dentry timeout has not been overridden set default for
+	 * cache=loose
+	 */
+	if (!(v9ses->flags & V9FS_NDENTRY_TIMEOUT_SET) &&
+	    (v9ses->cache & CACHE_LOOSE))
+		v9ses->ndentry_timeout_ms = CACHE_LOOSE_NDENTRY_TIMEOUT_DEFAULT;
 }

 /**