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smb3: if server does not support posix do not allow posix mount option 

If user specifies "posix" on an SMB3.11 mount, then fail the mount
if server does not return the POSIX negotiate context indicating
support for posix.

Signed-off-by: Steve French <stfrench@microsoft.com>
Reviewed-by: Aurelien Aptel <aaptel@suse.com>
This commit is contained in:
Steve French 2018-06-18 14:01:59 -05:00
parent cbedeadf9c
commit 8505c8bfd8
1 changed files with 6 additions and 2 deletions
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8
fs/cifs/connect.c
View File

@ -3031,11 +3031,15 @@ cifs_get_tcon(struct cifs_ses *ses, struct smb_vol *volume_info)
}
#ifdef CONFIG_CIFS_SMB311
if ((volume_info->linux_ext) && (ses->server->posix_ext_supported)) {
if (ses->server->vals->protocol_id == SMB311_PROT_ID) {
if (volume_info->linux_ext) {
if (ses->server->posix_ext_supported) {
tcon->posix_extensions = true;
printk_once(KERN_WARNING
"SMB3.11 POSIX Extensions are experimental\n");
} else {
cifs_dbg(VFS, "Server does not support mounting with posix SMB3.11 extensions.\n");
rc = -EOPNOTSUPP;
goto out_fail;
}
}
#endif /* 311 */