cifs: Add support for writing attributes on SMB2+

This adds support for writing extended attributes on SMB2+ shares.
Attributes can be written using the setfattr command.

RH-bz: 1110709

Signed-off-by: Ronnie Sahlberg <lsahlber@redhat.com>
Signed-off-by: Steve French <smfrench@gmail.com>
Reviewed-by: Pavel Shilovsky <pshilov@microsoft.com>

fs/cifs/cifsglob.h

@@ -421,7 +421,7 @@ struct smb_version_operations {
 			size_t, struct cifs_sb_info *);
 	int (*set_EA)(const unsigned int, struct cifs_tcon *, const char *,
 			const char *, const void *, const __u16,
-			const struct nls_table *, int);
+			const struct nls_table *, struct cifs_sb_info *);
 	struct cifs_ntsd * (*get_acl)(struct cifs_sb_info *, struct inode *,
 			const char *, u32 *);
 	struct cifs_ntsd * (*get_acl_by_fid)(struct cifs_sb_info *,

fs/cifs/cifsproto.h

@@ -484,7 +484,8 @@ extern ssize_t CIFSSMBQAllEAs(const unsigned int xid, struct cifs_tcon *tcon,
 extern int CIFSSMBSetEA(const unsigned int xid, struct cifs_tcon *tcon,
 		const char *fileName, const char *ea_name,
 		const void *ea_value, const __u16 ea_value_len,
-		const struct nls_table *nls_codepage, int remap_special_chars);
+		const struct nls_table *nls_codepage,
+		struct cifs_sb_info *cifs_sb);
 extern int CIFSSMBGetCIFSACL(const unsigned int xid, struct cifs_tcon *tcon,
 			__u16 fid, struct cifs_ntsd **acl_inf, __u32 *buflen);
 extern int CIFSSMBSetCIFSACL(const unsigned int, struct cifs_tcon *, __u16,

fs/cifs/cifssmb.c

@@ -6264,7 +6264,7 @@ int
 CIFSSMBSetEA(const unsigned int xid, struct cifs_tcon *tcon,
 	     const char *fileName, const char *ea_name, const void *ea_value,
 	     const __u16 ea_value_len, const struct nls_table *nls_codepage,
-	     int remap)
+	     struct cifs_sb_info *cifs_sb)
 {
 	struct smb_com_transaction2_spi_req *pSMB = NULL;
 	struct smb_com_transaction2_spi_rsp *pSMBr = NULL;
@@ -6273,6 +6273,7 @@ CIFSSMBSetEA(const unsigned int xid, struct cifs_tcon *tcon,
 	int rc = 0;
 	int bytes_returned = 0;
 	__u16 params, param_offset, byte_count, offset, count;
+	int remap = cifs_remap(cifs_sb);
 
 	cifs_dbg(FYI, "In SetEA\n");
 SetEARetry:

fs/cifs/smb2ops.c

@@ -558,6 +558,62 @@ smb2_query_eas(const unsigned int xid, struct cifs_tcon *tcon,
 	return rc;
 }
 
+
+static int
+smb2_set_ea(const unsigned int xid, struct cifs_tcon *tcon,
+	    const char *path, const char *ea_name, const void *ea_value,
+	    const __u16 ea_value_len, const struct nls_table *nls_codepage,
+	    struct cifs_sb_info *cifs_sb)
+{
+	int rc;
+	__le16 *utf16_path;
+	__u8 oplock = SMB2_OPLOCK_LEVEL_NONE;
+	struct cifs_open_parms oparms;
+	struct cifs_fid fid;
+	struct smb2_file_full_ea_info *ea;
+	int ea_name_len = strlen(ea_name);
+	int len;
+
+	if (ea_name_len > 255)
+		return -EINVAL;
+
+	utf16_path = cifs_convert_path_to_utf16(path, cifs_sb);
+	if (!utf16_path)
+		return -ENOMEM;
+
+	oparms.tcon = tcon;
+	oparms.desired_access = FILE_WRITE_EA;
+	oparms.disposition = FILE_OPEN;
+	oparms.create_options = 0;
+	oparms.fid = &fid;
+	oparms.reconnect = false;
+
+	rc = SMB2_open(xid, &oparms, utf16_path, &oplock, NULL, NULL);
+	kfree(utf16_path);
+	if (rc) {
+		cifs_dbg(FYI, "open failed rc=%d\n", rc);
+		return rc;
+	}
+
+	len = sizeof(ea) + ea_name_len + ea_value_len + 1;
+	ea = kzalloc(len, GFP_KERNEL);
+	if (ea == NULL) {
+		SMB2_close(xid, tcon, fid.persistent_fid, fid.volatile_fid);
+		return -ENOMEM;
+	}
+
+	ea->ea_name_length = ea_name_len;
+	ea->ea_value_length = cpu_to_le16(ea_value_len);
+	memcpy(ea->ea_data, ea_name, ea_name_len + 1);
+	memcpy(ea->ea_data + ea_name_len + 1, ea_value, ea_value_len);
+
+	rc = SMB2_set_ea(xid, tcon, fid.persistent_fid, fid.volatile_fid, ea,
+			 len);
+	SMB2_close(xid, tcon, fid.persistent_fid, fid.volatile_fid);
+
+	return rc;
+}
+
 static bool
 smb2_can_echo(struct TCP_Server_Info *server)
 {
@@ -2706,6 +2762,7 @@ struct smb_version_operations smb20_operations = {
 	.select_sectype = smb2_select_sectype,
 #ifdef CONFIG_CIFS_XATTR
 	.query_all_EAs = smb2_query_eas,
+	.set_EA = smb2_set_ea,
 #endif /* CIFS_XATTR */
 #ifdef CONFIG_CIFS_ACL
 	.get_acl = get_smb2_acl,
@@ -2799,6 +2856,7 @@ struct smb_version_operations smb21_operations = {
 	.select_sectype = smb2_select_sectype,
 #ifdef CONFIG_CIFS_XATTR
 	.query_all_EAs = smb2_query_eas,
+	.set_EA = smb2_set_ea,
 #endif /* CIFS_XATTR */
 #ifdef CONFIG_CIFS_ACL
 	.get_acl = get_smb2_acl,
@@ -2902,6 +2960,7 @@ struct smb_version_operations smb30_operations = {
 	.select_sectype = smb2_select_sectype,
 #ifdef CONFIG_CIFS_XATTR
 	.query_all_EAs = smb2_query_eas,
+	.set_EA = smb2_set_ea,
 #endif /* CIFS_XATTR */
 #ifdef CONFIG_CIFS_ACL
 	.get_acl = get_smb2_acl,
@@ -3006,6 +3065,7 @@ struct smb_version_operations smb311_operations = {
 	.select_sectype = smb2_select_sectype,
 #ifdef CONFIG_CIFS_XATTR
 	.query_all_EAs = smb2_query_eas,
+	.set_EA = smb2_set_ea,
 #endif /* CIFS_XATTR */
 };
 #endif /* CIFS_SMB311 */

fs/cifs/smb2pdu.c

@@ -3196,6 +3196,16 @@ SMB2_set_acl(const unsigned int xid, struct cifs_tcon *tcon,
 			1, (void **)&pnntsd, &pacllen);
 }
 
+int
+SMB2_set_ea(const unsigned int xid, struct cifs_tcon *tcon,
+	    u64 persistent_fid, u64 volatile_fid,
+	    struct smb2_file_full_ea_info *buf, int len)
+{
+	return send_set_info(xid, tcon, persistent_fid, volatile_fid,
+		current->tgid, FILE_FULL_EA_INFORMATION, SMB2_O_INFO_FILE,
+		0, 1, (void **)&buf, &len);
+}
+
 int
 SMB2_oplock_break(const unsigned int xid, struct cifs_tcon *tcon,
 		  const u64 persistent_fid, const u64 volatile_fid,

fs/cifs/smb2proto.h

@@ -172,6 +172,9 @@ extern int SMB2_set_info(const unsigned int xid, struct cifs_tcon *tcon,
 extern int SMB2_set_acl(const unsigned int xid, struct cifs_tcon *tcon,
 			u64 persistent_fid, u64 volatile_fid,
 			struct cifs_ntsd *pnntsd, int pacllen, int aclflag);
+extern int SMB2_set_ea(const unsigned int xid, struct cifs_tcon *tcon,
+		       u64 persistent_fid, u64 volatile_fid,
+		       struct smb2_file_full_ea_info *buf, int len);
 extern int SMB2_set_compression(const unsigned int xid, struct cifs_tcon *tcon,
 				u64 persistent_fid, u64 volatile_fid);
 extern int SMB2_oplock_break(const unsigned int xid, struct cifs_tcon *tcon,

fs/cifs/xattr.c

@@ -84,7 +84,7 @@ static int cifs_xattr_set(const struct xattr_handler *handler,
 		if (pTcon->ses->server->ops->set_EA)
 			rc = pTcon->ses->server->ops->set_EA(xid, pTcon,
 				full_path, name, value, (__u16)size,
-				cifs_sb->local_nls, cifs_remap(cifs_sb));
+				cifs_sb->local_nls, cifs_sb);
 		break;
 
 	case XATTR_CIFS_ACL: {