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cifs: do not share tcp servers with dfs mounts

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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>
Reviewed-by: Aurelien Aptel <aaptel@suse.com>
Signed-off-by: Steve French <stfrench@microsoft.com>
This commit is contained in:
Paulo Alcantara 2021-06-04 19:25:33 -03:00 committed by Steve French
parent c950fc7af9
commit f3c852b0b0
1 changed files with 3 additions and 4 deletions
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7
fs/cifs/connect.c
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@ -1944,10 +1944,7 @@ 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;
@ -3411,6 +3408,8 @@ 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)) {