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cifs: smb2ops: Fix listxattr() when there are no EAs

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As per listxattr(2):

       On success, a nonnegative number is returned indicating the size
       of the extended attribute name list.  On failure, -1 is returned
       and errno  is set appropriately.

In SMB1, when the server returns an empty EA list through a listxattr(),
it will correctly return 0 as there are no EAs for the given file.

However, in SMB2+, it returns -ENODATA in listxattr() which is wrong since
the request and response were sent successfully, although there's no actual
EA for the given file.

This patch fixes listxattr() for SMB2+ by returning 0 in cifs_listxattr()
when the server returns an empty list of EAs.

Signed-off-by: Paulo Alcantara <palcantara@suse.de>
Reviewed-by: Aurelien Aptel <aaptel@suse.com>
Signed-off-by: Steve French <smfrench@gmail.com>
This commit is contained in:
Paulo Alcantara 2018-05-04 11:25:26 -03:00 committed by Steve French
parent f7c439668a
commit ae2cd7fb47
1 changed files with 6 additions and 0 deletions
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6
fs/cifs/smb2ops.c
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@ -589,9 +589,15 @@ smb2_query_eas(const unsigned int xid, struct cifs_tcon *tcon,
SMB2_close(xid, tcon, fid.persistent_fid, fid.volatile_fid);
/*
* If ea_name is NULL (listxattr) and there are no EAs, return 0 as it's
* not an error. Otherwise, the specified ea_name was not found.
*/
if (!rc)
rc = move_smb2_ea_to_cifs(ea_data, buf_size, smb2_data,
SMB2_MAX_EA_BUF, ea_name);
else if (!ea_name && rc == -ENODATA)
rc = 0;
kfree(smb2_data);
return rc;