linux-kernel - [ammarfaizi2-block:stable/linux-stable-rc/queue/5.18 29/879] fs/cifs/connect.c:3435:14: warning: unused variable 'nodfs'

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Date:   Thu, 9 Jun 2022 07:13:39 +0800
From:   kernel test robot <lkp@...el.com>
To:     Enzo Matsumiya <ematsumiya@...e.de>
Cc:     kbuild-all@...ts.01.org,
        GNU/Weeb Mailing List <gwml@...r.gnuweeb.org>,
        linux-kernel@...r.kernel.org, Sasha Levin <sashal@...nel.org>,
        "Paulo Alcantara (SUSE)" <pc@....nz>,
        Steve French <stfrench@...rosoft.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Subject: [ammarfaizi2-block:stable/linux-stable-rc/queue/5.18 29/879]
 fs/cifs/connect.c:3435:14: warning: unused variable 'nodfs'

tree:   https://github.com/ammarfaizi2/linux-block stable/linux-stable-rc/queue/5.18
head:   7383156f95c8c7f7bda72abd7fa4d1bc06e2a8cf
commit: 98dd3927170845f16f5120686a0b5c5f181a3b87 [29/879] cifs: don't call cifs_dfs_query_info_nonascii_quirk() if nodfs was set
config: i386-randconfig-a001 (https://download.01.org/0day-ci/archive/20220609/202206090711.ZJTiUk4L-lkp@intel.com/config)
compiler: gcc-11 (Debian 11.3.0-3) 11.3.0
reproduce (this is a W=1 build):
        # https://github.com/ammarfaizi2/linux-block/commit/98dd3927170845f16f5120686a0b5c5f181a3b87
        git remote add ammarfaizi2-block https://github.com/ammarfaizi2/linux-block
        git fetch --no-tags ammarfaizi2-block stable/linux-stable-rc/queue/5.18
        git checkout 98dd3927170845f16f5120686a0b5c5f181a3b87
        # save the config file
        mkdir build_dir && cp config build_dir/.config
        make W=1 O=build_dir ARCH=i386 SHELL=/bin/bash fs/cifs/

If you fix the issue, kindly add following tag where applicable
Reported-by: kernel test robot <lkp@...el.com>

All warnings (new ones prefixed by >>):

   fs/cifs/connect.c: In function 'is_path_remote':
>> fs/cifs/connect.c:3435:14: warning: unused variable 'nodfs' [-Wunused-variable]
    3435 |         bool nodfs = cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_DFS;
         |              ^~~~~


vim +/nodfs +3435 fs/cifs/connect.c

  3421	
  3422	/*
  3423	 * Check if path is remote (e.g. a DFS share). Return -EREMOTE if it is,
  3424	 * otherwise 0.
  3425	 */
  3426	static int is_path_remote(struct mount_ctx *mnt_ctx)
  3427	{
  3428		int rc;
  3429		struct cifs_sb_info *cifs_sb = mnt_ctx->cifs_sb;
  3430		struct TCP_Server_Info *server = mnt_ctx->server;
  3431		unsigned int xid = mnt_ctx->xid;
  3432		struct cifs_tcon *tcon = mnt_ctx->tcon;
  3433		struct smb3_fs_context *ctx = mnt_ctx->fs_ctx;
  3434		char *full_path;
> 3435		bool nodfs = cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_DFS;
  3436	
  3437		if (!server->ops->is_path_accessible)
  3438			return -EOPNOTSUPP;
  3439	
  3440		/*
  3441		 * cifs_build_path_to_root works only when we have a valid tcon
  3442		 */
  3443		full_path = cifs_build_path_to_root(ctx, cifs_sb, tcon,
  3444						    tcon->Flags & SMB_SHARE_IS_IN_DFS);
  3445		if (full_path == NULL)
  3446			return -ENOMEM;
  3447	
  3448		cifs_dbg(FYI, "%s: full_path: %s\n", __func__, full_path);
  3449	
  3450		rc = server->ops->is_path_accessible(xid, tcon, cifs_sb,
  3451						     full_path);
  3452	#ifdef CONFIG_CIFS_DFS_UPCALL
  3453		if (nodfs) {
  3454			if (rc == -EREMOTE)
  3455				rc = -EOPNOTSUPP;
  3456			goto out;
  3457		}
  3458	
  3459		/* path *might* exist with non-ASCII characters in DFS root
  3460		 * try again with full path (only if nodfs is not set) */
  3461		if (rc == -ENOENT && is_tcon_dfs(tcon))
  3462			rc = cifs_dfs_query_info_nonascii_quirk(xid, tcon, cifs_sb,
  3463								full_path);
  3464	#endif
  3465		if (rc != 0 && rc != -EREMOTE)
  3466			goto out;
  3467	
  3468		if (rc != -EREMOTE) {
  3469			rc = cifs_are_all_path_components_accessible(server, xid, tcon,
  3470				cifs_sb, full_path, tcon->Flags & SMB_SHARE_IS_IN_DFS);
  3471			if (rc != 0) {
  3472				cifs_server_dbg(VFS, "cannot query dirs between root and final path, enabling CIFS_MOUNT_USE_PREFIX_PATH\n");
  3473				cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_USE_PREFIX_PATH;
  3474				rc = 0;
  3475			}
  3476		}
  3477	
  3478	out:
  3479		kfree(full_path);
  3480		return rc;
  3481	}
  3482	

-- 
0-DAY CI Kernel Test Service
https://01.org/lkp