1/*
2 *   fs/cifs/smb2inode.c
3 *
4 *   Copyright (C) International Business Machines  Corp., 2002, 2011
5 *                 Etersoft, 2012
6 *   Author(s): Pavel Shilovsky (pshilovsky@samba.org),
7 *              Steve French (sfrench@us.ibm.com)
8 *
9 *   This library is free software; you can redistribute it and/or modify
10 *   it under the terms of the GNU Lesser General Public License as published
11 *   by the Free Software Foundation; either version 2.1 of the License, or
12 *   (at your option) any later version.
13 *
14 *   This library is distributed in the hope that it will be useful,
15 *   but WITHOUT ANY WARRANTY; without even the implied warranty of
16 *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See
17 *   the GNU Lesser General Public License for more details.
18 *
19 *   You should have received a copy of the GNU Lesser General Public License
20 *   along with this library; if not, write to the Free Software
21 *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
22 */
23#include <linux/fs.h>
24#include <linux/stat.h>
25#include <linux/slab.h>
26#include <linux/pagemap.h>
27#include <asm/div64.h>
28#include "cifsfs.h"
29#include "cifspdu.h"
30#include "cifsglob.h"
31#include "cifsproto.h"
32#include "cifs_debug.h"
33#include "cifs_fs_sb.h"
34#include "cifs_unicode.h"
35#include "fscache.h"
36#include "smb2glob.h"
37#include "smb2pdu.h"
38#include "smb2proto.h"
39
40static int
41smb2_open_op_close(const unsigned int xid, struct cifs_tcon *tcon,
42		   struct cifs_sb_info *cifs_sb, const char *full_path,
43		   __u32 desired_access, __u32 create_disposition,
44		   __u32 create_options, void *data, int command)
45{
46	int rc, tmprc = 0;
47	__le16 *utf16_path;
48	__u8 oplock = SMB2_OPLOCK_LEVEL_NONE;
49	struct cifs_open_parms oparms;
50	struct cifs_fid fid;
51
52	utf16_path = cifs_convert_path_to_utf16(full_path, cifs_sb);
53	if (!utf16_path)
54		return -ENOMEM;
55
56	oparms.tcon = tcon;
57	oparms.desired_access = desired_access;
58	oparms.disposition = create_disposition;
59	oparms.create_options = create_options;
60	oparms.fid = &fid;
61	oparms.reconnect = false;
62
63	rc = SMB2_open(xid, &oparms, utf16_path, &oplock, NULL, NULL);
64	if (rc) {
65		kfree(utf16_path);
66		return rc;
67	}
68
69	switch (command) {
70	case SMB2_OP_DELETE:
71		break;
72	case SMB2_OP_QUERY_INFO:
73		tmprc = SMB2_query_info(xid, tcon, fid.persistent_fid,
74					fid.volatile_fid,
75					(struct smb2_file_all_info *)data);
76		break;
77	case SMB2_OP_MKDIR:
78		/*
79		 * Directories are created through parameters in the
80		 * SMB2_open() call.
81		 */
82		break;
83	case SMB2_OP_RMDIR:
84		tmprc = SMB2_rmdir(xid, tcon, fid.persistent_fid,
85				   fid.volatile_fid);
86		break;
87	case SMB2_OP_RENAME:
88		tmprc = SMB2_rename(xid, tcon, fid.persistent_fid,
89				    fid.volatile_fid, (__le16 *)data);
90		break;
91	case SMB2_OP_HARDLINK:
92		tmprc = SMB2_set_hardlink(xid, tcon, fid.persistent_fid,
93					  fid.volatile_fid, (__le16 *)data);
94		break;
95	case SMB2_OP_SET_EOF:
96		tmprc = SMB2_set_eof(xid, tcon, fid.persistent_fid,
97				     fid.volatile_fid, current->tgid,
98				     (__le64 *)data, false);
99		break;
100	case SMB2_OP_SET_INFO:
101		tmprc = SMB2_set_info(xid, tcon, fid.persistent_fid,
102				      fid.volatile_fid,
103				      (FILE_BASIC_INFO *)data);
104		break;
105	default:
106		cifs_dbg(VFS, "Invalid command\n");
107		break;
108	}
109
110	rc = SMB2_close(xid, tcon, fid.persistent_fid, fid.volatile_fid);
111	if (tmprc)
112		rc = tmprc;
113	kfree(utf16_path);
114	return rc;
115}
116
117void
118move_smb2_info_to_cifs(FILE_ALL_INFO *dst, struct smb2_file_all_info *src)
119{
120	memcpy(dst, src, (size_t)(&src->CurrentByteOffset) - (size_t)src);
121	dst->CurrentByteOffset = src->CurrentByteOffset;
122	dst->Mode = src->Mode;
123	dst->AlignmentRequirement = src->AlignmentRequirement;
124	dst->IndexNumber1 = 0; /* we don't use it */
125}
126
127int
128smb2_query_path_info(const unsigned int xid, struct cifs_tcon *tcon,
129		     struct cifs_sb_info *cifs_sb, const char *full_path,
130		     FILE_ALL_INFO *data, bool *adjust_tz, bool *symlink)
131{
132	int rc;
133	struct smb2_file_all_info *smb2_data;
134
135	*adjust_tz = false;
136	*symlink = false;
137
138	smb2_data = kzalloc(sizeof(struct smb2_file_all_info) + PATH_MAX * 2,
139			    GFP_KERNEL);
140	if (smb2_data == NULL)
141		return -ENOMEM;
142
143	rc = smb2_open_op_close(xid, tcon, cifs_sb, full_path,
144				FILE_READ_ATTRIBUTES, FILE_OPEN, 0,
145				smb2_data, SMB2_OP_QUERY_INFO);
146	if (rc == -EOPNOTSUPP) {
147		*symlink = true;
148		/* Failed on a symbolic link - query a reparse point info */
149		rc = smb2_open_op_close(xid, tcon, cifs_sb, full_path,
150					FILE_READ_ATTRIBUTES, FILE_OPEN,
151					OPEN_REPARSE_POINT, smb2_data,
152					SMB2_OP_QUERY_INFO);
153	}
154	if (rc)
155		goto out;
156
157	move_smb2_info_to_cifs(data, smb2_data);
158out:
159	kfree(smb2_data);
160	return rc;
161}
162
163int
164smb2_mkdir(const unsigned int xid, struct cifs_tcon *tcon, const char *name,
165	   struct cifs_sb_info *cifs_sb)
166{
167	return smb2_open_op_close(xid, tcon, cifs_sb, name,
168				  FILE_WRITE_ATTRIBUTES, FILE_CREATE,
169				  CREATE_NOT_FILE, NULL, SMB2_OP_MKDIR);
170}
171
172void
173smb2_mkdir_setinfo(struct inode *inode, const char *name,
174		   struct cifs_sb_info *cifs_sb, struct cifs_tcon *tcon,
175		   const unsigned int xid)
176{
177	FILE_BASIC_INFO data;
178	struct cifsInodeInfo *cifs_i;
179	u32 dosattrs;
180	int tmprc;
181
182	memset(&data, 0, sizeof(data));
183	cifs_i = CIFS_I(inode);
184	dosattrs = cifs_i->cifsAttrs | ATTR_READONLY;
185	data.Attributes = cpu_to_le32(dosattrs);
186	tmprc = smb2_open_op_close(xid, tcon, cifs_sb, name,
187				   FILE_WRITE_ATTRIBUTES, FILE_CREATE,
188				   CREATE_NOT_FILE, &data, SMB2_OP_SET_INFO);
189	if (tmprc == 0)
190		cifs_i->cifsAttrs = dosattrs;
191}
192
193int
194smb2_rmdir(const unsigned int xid, struct cifs_tcon *tcon, const char *name,
195	   struct cifs_sb_info *cifs_sb)
196{
197	return smb2_open_op_close(xid, tcon, cifs_sb, name, DELETE, FILE_OPEN,
198				  CREATE_NOT_FILE,
199				  NULL, SMB2_OP_RMDIR);
200}
201
202int
203smb2_unlink(const unsigned int xid, struct cifs_tcon *tcon, const char *name,
204	    struct cifs_sb_info *cifs_sb)
205{
206	return smb2_open_op_close(xid, tcon, cifs_sb, name, DELETE, FILE_OPEN,
207				  CREATE_DELETE_ON_CLOSE | OPEN_REPARSE_POINT,
208				  NULL, SMB2_OP_DELETE);
209}
210
211static int
212smb2_set_path_attr(const unsigned int xid, struct cifs_tcon *tcon,
213		   const char *from_name, const char *to_name,
214		   struct cifs_sb_info *cifs_sb, __u32 access, int command)
215{
216	__le16 *smb2_to_name = NULL;
217	int rc;
218
219	smb2_to_name = cifs_convert_path_to_utf16(to_name, cifs_sb);
220	if (smb2_to_name == NULL) {
221		rc = -ENOMEM;
222		goto smb2_rename_path;
223	}
224
225	rc = smb2_open_op_close(xid, tcon, cifs_sb, from_name, access,
226				FILE_OPEN, 0, smb2_to_name, command);
227smb2_rename_path:
228	kfree(smb2_to_name);
229	return rc;
230}
231
232int
233smb2_rename_path(const unsigned int xid, struct cifs_tcon *tcon,
234		 const char *from_name, const char *to_name,
235		 struct cifs_sb_info *cifs_sb)
236{
237	return smb2_set_path_attr(xid, tcon, from_name, to_name, cifs_sb,
238				  DELETE, SMB2_OP_RENAME);
239}
240
241int
242smb2_create_hardlink(const unsigned int xid, struct cifs_tcon *tcon,
243		     const char *from_name, const char *to_name,
244		     struct cifs_sb_info *cifs_sb)
245{
246	return smb2_set_path_attr(xid, tcon, from_name, to_name, cifs_sb,
247				  FILE_READ_ATTRIBUTES, SMB2_OP_HARDLINK);
248}
249
250int
251smb2_set_path_size(const unsigned int xid, struct cifs_tcon *tcon,
252		   const char *full_path, __u64 size,
253		   struct cifs_sb_info *cifs_sb, bool set_alloc)
254{
255	__le64 eof = cpu_to_le64(size);
256	return smb2_open_op_close(xid, tcon, cifs_sb, full_path,
257				  FILE_WRITE_DATA, FILE_OPEN, 0, &eof,
258				  SMB2_OP_SET_EOF);
259}
260
261int
262smb2_set_file_info(struct inode *inode, const char *full_path,
263		   FILE_BASIC_INFO *buf, const unsigned int xid)
264{
265	struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
266	struct tcon_link *tlink;
267	int rc;
268
269	tlink = cifs_sb_tlink(cifs_sb);
270	if (IS_ERR(tlink))
271		return PTR_ERR(tlink);
272	rc = smb2_open_op_close(xid, tlink_tcon(tlink), cifs_sb, full_path,
273				FILE_WRITE_ATTRIBUTES, FILE_OPEN, 0, buf,
274				SMB2_OP_SET_INFO);
275	cifs_put_tlink(tlink);
276	return rc;
277}
278