[PATCH v4 3/4] 9p: Set default negative dentry retention time for cache=loose

[Remi Pommarel]

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

Signed-off-by: Remi Pommarel <repk@xxxxxxxxxxxx>
---
 fs/9p/v9fs.c | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/fs/9p/v9fs.c b/fs/9p/v9fs.c
index f16517be7fc2..79b6a8b82779 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;
@@ -437,6 +440,13 @@ 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;
 }
 
 /**
-- 
2.52.0