[PATCH 7/7] cifs: do not share tcp servers with dfs mounts

[Paulo Alcantara <pc@cjr.nz>]

It isn't enough to have unshared tcons because multiple DFS mounts can
connect to same target server and failover to different servers, so we
can't use a single tcp server for such cases.

For the simplest solution, use nosharesock option to achieve that.

Signed-off-by: Paulo Alcantara (SUSE) <pc@cjr.nz>
---
 fs/cifs/connect.c | 7 +++----
 1 file changed, 3 insertions(+), 4 deletions(-)

diff --git a/fs/cifs/connect.c b/fs/cifs/connect.c
index cece0c2249c3..05f5c84a63a4 100644
--- a/fs/cifs/connect.c
+++ b/fs/cifs/connect.c
@@ -1938,10 +1938,7 @@ cifs_find_tcon(struct cifs_ses *ses, struct smb3_fs_context *ctx)
 	spin_lock(&cifs_tcp_ses_lock);
 	list_for_each(tmp, &ses->tcon_list) {
 		tcon = list_entry(tmp, struct cifs_tcon, tcon_list);
-#ifdef CONFIG_CIFS_DFS_UPCALL
-		if (tcon->dfs_path)
-			continue;
-#endif
+
 		if (!match_tcon(tcon, ctx))
 			continue;
 		++tcon->tc_count;
@@ -3406,6 +3403,8 @@ int cifs_mount(struct cifs_sb_info *cifs_sb, struct smb3_fs_context *ctx)
 			goto error;
 	}
 
+	ctx->nosharesock = true;
+
 	/* Get path of DFS root */
 	ref_path = build_unc_path_to_root(ctx, cifs_sb, false);
 	if (IS_ERR(ref_path)) {
-- 
2.31.1