[PATCH v3 09/11] cifs: Simplify reconnect code when dfs upcall is enabled

Samuel Cabrero
2020-10-30T11:52:57Z

Some witness notifications, like client move, tell the client to
reconnect to a specific IP address. In this situation the DFS failover
code path has to be skipped so clean up as much as possible the
cifs_reconnect() code.

Signed-off-by: Samuel Cabrero <scabrero@suse.de>
---
fs/cifs/connect.c | 21 ++++++++-------------
1 file changed, 8 insertions(+), 13 deletions(-)

diff --git a/fs/cifs/connect.c b/fs/cifs/connect.c
index cb9ca4238ae9..14bbec0aeccf 100644
--- a/fs/cifs/connect.c
+++ b/fs/cifs/connect.c
@@ -296,7 +296,7 @@ static void cifs_prune_tlinks(struct work_struct *work);
* This should be called with server->srv_mutex held.
*/
#ifdef CONFIG_CIFS_DFS_UPCALL
-static int reconn_set_ipaddr(struct TCP_Server_Info *server)
+static int reconn_set_ipaddr_from_hostname(struct TCP_Server_Info *server)
{
int rc;
int len;
@@ -331,14 +331,7 @@ static int reconn_set_ipaddr(struct TCP_Server_Info *server)

return !rc ? -1 : 0;
}
-#else
-static inline int reconn_set_ipaddr(struct TCP_Server_Info *server)
-{
- return 0;
-}
-#endif

-#ifdef CONFIG_CIFS_DFS_UPCALL
/* These functions must be called with server->srv_mutex held */
static void reconn_set_next_dfs_target(struct TCP_Server_Info *server,
struct cifs_sb_info *cifs_sb,
@@ -346,6 +339,7 @@ static void reconn_set_next_dfs_target(struct TCP_Server_Info *server,
struct dfs_cache_tgt_iterator **tgt_it)
{
const char *name;
+ int rc;

if (!cifs_sb || !cifs_sb->origin_fullpath)
return;
@@ -370,6 +364,12 @@ static void reconn_set_next_dfs_target(struct TCP_Server_Info *server,
"%s: failed to extract hostname from target: %ld\n",
__func__, PTR_ERR(server->hostname));
}
+
+ rc = reconn_set_ipaddr_from_hostname(server);
+ if (rc) {
+ cifs_dbg(FYI, "%s: failed to resolve hostname: %d\n",
+ __func__, rc);
+ }
}

static inline int reconn_setup_dfs_targets(struct cifs_sb_info *cifs_sb,
@@ -528,11 +528,6 @@ cifs_reconnect(struct TCP_Server_Info *server)
*/
reconn_set_next_dfs_target(server, cifs_sb, &tgt_list, &tgt_it);
#endif
- rc = reconn_set_ipaddr(server);
- if (rc) {
- cifs_dbg(FYI, "%s: failed to resolve hostname: %d\n",
- __func__, rc);
- }

if (cifs_rdma_enabled(server))
rc = smbd_reconnect(server);
--
2.29.0