[PATCH AUTOSEL 6.6 15/15] smb: client: fix FSCTL_GET_REPARSE_POINT against NetApp

From: Sasha Levin
Date: Mon Aug 05 2024 - 14:04:37 EST


From: Paulo Alcantara <pc@xxxxxxxxxxxxx>

[ Upstream commit ddecea00f87f0c46e9c8339a7c89fb2ff891521a ]

NetApp server requires the file to be open with FILE_READ_EA access in
order to support FSCTL_GET_REPARSE_POINT, otherwise it will return
STATUS_INVALID_DEVICE_REQUEST. It doesn't make any sense because
there's no requirement for FILE_READ_EA bit to be set nor
STATUS_INVALID_DEVICE_REQUEST being used for something other than
"unsupported reparse points" in MS-FSA.

To fix it and improve compatibility, set FILE_READ_EA & SYNCHRONIZE
bits to match what Windows client currently does.

Tested-by: Sebastian Steinbeisser <Sebastian.Steinbeisser@xxxxxx>
Acked-by: Tom Talpey <tom@xxxxxxxxxx>
Signed-off-by: Paulo Alcantara (Red Hat) <pc@xxxxxxxxxxxxx>
Signed-off-by: Steve French <stfrench@xxxxxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
---
fs/smb/client/smb2inode.c | 6 ++++--
1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/fs/smb/client/smb2inode.c b/fs/smb/client/smb2inode.c
index 86f8c81791374..cd7b8ab84e5ca 100644
--- a/fs/smb/client/smb2inode.c
+++ b/fs/smb/client/smb2inode.c
@@ -948,7 +948,8 @@ int smb2_query_path_info(const unsigned int xid,
cmds[num_cmds++] = SMB2_OP_GET_REPARSE;

oparms = CIFS_OPARMS(cifs_sb, tcon, full_path,
- FILE_READ_ATTRIBUTES | FILE_READ_EA,
+ FILE_READ_ATTRIBUTES |
+ FILE_READ_EA | SYNCHRONIZE,
FILE_OPEN, create_options |
OPEN_REPARSE_POINT, ACL_NO_MODE);
cifs_get_readable_path(tcon, full_path, &cfile);
@@ -1256,7 +1257,8 @@ int smb2_query_reparse_point(const unsigned int xid,
cifs_dbg(FYI, "%s: path: %s\n", __func__, full_path);

cifs_get_readable_path(tcon, full_path, &cfile);
- oparms = CIFS_OPARMS(cifs_sb, tcon, full_path, FILE_READ_ATTRIBUTES,
+ oparms = CIFS_OPARMS(cifs_sb, tcon, full_path,
+ FILE_READ_ATTRIBUTES | FILE_READ_EA | SYNCHRONIZE,
FILE_OPEN, OPEN_REPARSE_POINT, ACL_NO_MODE);
rc = smb2_compound_op(xid, tcon, cifs_sb,
full_path, &oparms, &in_iov,
--
2.43.0