linux-kernel - [34-longterm 180/196] cifs: add fallback in is_path

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Date:	Mon, 12 Mar 2012 20:21:33 -0400
From:	Paul Gortmaker <paul.gortmaker@...driver.com>
To:	stable@...nel.org, linux-kernel@...r.kernel.org
Cc:	stable-review@...nel.org, Jeff Layton <jlayton@...hat.com>,
	Steve French <sfrench@...ibm.com>,
	Paul Gortmaker <paul.gortmaker@...driver.com>
Subject: [34-longterm 180/196] cifs: add fallback in is_path_accessible for old servers

From: Jeff Layton <jlayton@...hat.com>

                   -------------------
    This is a commit scheduled for the next v2.6.34 longterm release.
    If you see a problem with using this for longterm, please comment.
                   -------------------

commit 221d1d797202984cb874e3ed9f1388593d34ee22 upstream.

The is_path_accessible check uses a QPathInfo call, which isn't
supported by ancient win9x era servers. Fall back to an older
SMBQueryInfo call if it fails with the magic error codes.

Reported-and-Tested-by: Sandro Bonazzola <sandro.bonazzola@...il.com>
Signed-off-by: Jeff Layton <jlayton@...hat.com>
Signed-off-by: Steve French <sfrench@...ibm.com>
Signed-off-by: Paul Gortmaker <paul.gortmaker@...driver.com>
---
 fs/cifs/connect.c |    5 +++++
 1 file changed, 5 insertions(+)

diff --git a/fs/cifs/connect.c b/fs/cifs/connect.c
index cebbc29..1f6aae0 100644
--- a/fs/cifs/connect.c
+++ b/fs/cifs/connect.c
@@ -2254,6 +2254,11 @@ is_path_accessible(int xid, struct cifsTconInfo *tcon,
 			      0 /* not legacy */, cifs_sb->local_nls,
 			      cifs_sb->mnt_cifs_flags &
 				CIFS_MOUNT_MAP_SPECIAL_CHR);
+
+	if (rc == -EOPNOTSUPP || rc == -EINVAL)
+		rc = SMBQueryInformation(xid, tcon, full_path, pfile_info,
+				cifs_sb->local_nls, cifs_sb->mnt_cifs_flags &
+				  CIFS_MOUNT_MAP_SPECIAL_CHR);
 	kfree(pfile_info);
 	return rc;
 }
-- 
1.7.9.3

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