From 345c1a4a9e09dc5842b7bbb6728a77910db69c52 Mon Sep 17 00:00:00 2001 From: "Paulo Alcantara (SUSE)" Date: Wed, 4 Dec 2019 17:38:00 -0300 Subject: cifs: Introduce helpers for finding TCP connection Add helpers for finding TCP connections that are good candidates for being used by DFS refresh worker. Signed-off-by: Paulo Alcantara (SUSE) Reviewed-by: Aurelien Aptel Signed-off-by: Steve French --- fs/cifs/dfs_cache.c | 44 +++++++++++++++++++++++++++++++------------- 1 file changed, 31 insertions(+), 13 deletions(-) (limited to 'fs/cifs') diff --git a/fs/cifs/dfs_cache.c b/fs/cifs/dfs_cache.c index 49c5f045270f..e889608e5e13 100644 --- a/fs/cifs/dfs_cache.c +++ b/fs/cifs/dfs_cache.c @@ -1305,6 +1305,30 @@ static char *get_dfs_root(const char *path) return npath; } +static inline void put_tcp_server(struct TCP_Server_Info *server) +{ + cifs_put_tcp_session(server, 0); +} + +static struct TCP_Server_Info *get_tcp_server(struct smb_vol *vol) +{ + struct TCP_Server_Info *server; + + server = cifs_find_tcp_session(vol); + if (IS_ERR_OR_NULL(server)) + return NULL; + + spin_lock(&GlobalMid_Lock); + if (server->tcpStatus != CifsGood) { + spin_unlock(&GlobalMid_Lock); + put_tcp_server(server); + return NULL; + } + spin_unlock(&GlobalMid_Lock); + + return server; +} + /* Find root SMB session out of a DFS link path */ static struct cifs_ses *find_root_ses(struct vol_info *vi, struct cifs_tcon *tcon, @@ -1347,13 +1371,8 @@ static struct cifs_ses *find_root_ses(struct vol_info *vi, goto out; } - server = cifs_find_tcp_session(&vol); - if (IS_ERR_OR_NULL(server)) { - ses = ERR_PTR(-EHOSTDOWN); - goto out; - } - if (server->tcpStatus != CifsGood) { - cifs_put_tcp_session(server, 0); + server = get_tcp_server(&vol); + if (!server) { ses = ERR_PTR(-EHOSTDOWN); goto out; } @@ -1451,19 +1470,18 @@ static void refresh_cache_worker(struct work_struct *work) mutex_lock(&vol_lock); list_for_each_entry(vi, &vol_list, list) { - server = cifs_find_tcp_session(&vi->smb_vol); - if (IS_ERR_OR_NULL(server)) + server = get_tcp_server(&vi->smb_vol); + if (!server) continue; - if (server->tcpStatus != CifsGood) - goto next; + get_tcons(server, &list); list_for_each_entry_safe(tcon, ntcon, &list, ulist) { refresh_tcon(vi, tcon); list_del_init(&tcon->ulist); cifs_put_tcon(tcon); } -next: - cifs_put_tcp_session(server, 0); + + put_tcp_server(server); } queue_delayed_work(dfscache_wq, &refresh_task, cache_ttl * HZ); mutex_unlock(&vol_lock); -- cgit v1.2.3-59-g8ed1b