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cifs: Simplify reconnect code when dfs upcall is enabled 

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>
Reviewed-by: Aurelien Aptel <aaptel@suse.com>
Signed-off-by: Steve French <stfrench@microsoft.com>
zero-sugar-mainline-defconfig
Samuel Cabrero 2020-11-30 19:02:55 +01:00 committed by Steve French
parent 21077c62e1
commit 7d6535b720
1 changed files with 8 additions and 13 deletions
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21
fs/cifs/connect.c
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@ -88,7 +88,7 @@ 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;
@ -123,14 +123,7 @@ 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,
@ -138,6 +131,7 @@ 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;
@ -162,6 +156,12 @@ 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,
@ -320,11 +320,6 @@ 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);