smb: client: add drop_dir_cache module parameter to invalidate cached dirents

Add write-only /sys/module/cifs/parameters/drop_dir_cache. Writing a
non-zero value iterates all tcons and calls invalidate_all_cached_dirs()
to drop cached directory entries. This is useful to force a dirent cache
drop across mounts for debugging and testing purpose.

Signed-off-by: Bharath SM <bharathsm@microsoft.com>
Signed-off-by: Steve French <stfrench@microsoft.com>

diff --git a/fs/smb/client/cifsfs.c b/fs/smb/client/cifsfs.c
index dcb39d1b5958127e29fc84d7677fd06f7ead1772..9a83f528d39d1e9b4d1e3e5e95b72a4180aa98b7 100644 (file)
--- a/fs/smb/client/cifsfs.c
+++ b/fs/smb/client/cifsfs.c
@@ -121,6 +121,44 @@ unsigned int dir_cache_timeout = 30;
 module_param(dir_cache_timeout, uint, 0644);
 MODULE_PARM_DESC(dir_cache_timeout, "Number of seconds to cache directory contents for which we have a lease. Default: 30 "
                                 "Range: 1 to 65000 seconds, 0 to disable caching dir contents");
+
+/*
+ * Write-only module parameter to drop all cached directory entries across
+ * all CIFS mounts. Echo a non-zero value to trigger.
+ */
+static void cifs_drop_all_dir_caches(void)
+{
+       struct TCP_Server_Info *server;
+       struct cifs_ses *ses;
+       struct cifs_tcon *tcon;
+
+       spin_lock(&cifs_tcp_ses_lock);
+       list_for_each_entry(server, &cifs_tcp_ses_list, tcp_ses_list) {
+               list_for_each_entry(ses, &server->smb_ses_list, smb_ses_list) {
+                       if (cifs_ses_exiting(ses))
+                               continue;
+                       list_for_each_entry(tcon, &ses->tcon_list, tcon_list)
+                               invalidate_all_cached_dirs(tcon);
+               }
+       }
+       spin_unlock(&cifs_tcp_ses_lock);
+}
+
+static int cifs_param_set_drop_dir_cache(const char *val, const struct kernel_param *kp)
+{
+       bool bv;
+       int rc = kstrtobool(val, &bv);
+
+       if (rc)
+               return rc;
+       if (bv)
+               cifs_drop_all_dir_caches();
+       return 0;
+}
+
+module_param_call(drop_dir_cache, cifs_param_set_drop_dir_cache, NULL, NULL, 0200);
+MODULE_PARM_DESC(drop_dir_cache, "Write 1 to drop all cached directory entries across all CIFS mounts");
+
 #ifdef CONFIG_CIFS_STATS2
 unsigned int slow_rsp_threshold = 1;
 module_param(slow_rsp_threshold, uint, 0644);