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

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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
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@ -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 */