1 /*
2 * fs/cifs/smb2file.c
3 *
4 * Copyright (C) International Business Machines Corp., 2002, 2011
5 * Author(s): Steve French (sfrench@us.ibm.com),
6 * Pavel Shilovsky ((pshilovsky@samba.org) 2012
7 *
8 * This library is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU Lesser General Public License as published
10 * by the Free Software Foundation; either version 2.1 of the License, or
11 * (at your option) any later version.
12 *
13 * This library is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See
16 * the GNU Lesser General Public License for more details.
17 *
18 * You should have received a copy of the GNU Lesser General Public License
19 * along with this library; if not, write to the Free Software
20 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
21 */
22 #include <linux/fs.h>
23 #include <linux/stat.h>
24 #include <linux/slab.h>
25 #include <linux/pagemap.h>
26 #include <asm/div64.h>
27 #include "cifsfs.h"
28 #include "cifspdu.h"
29 #include "cifsglob.h"
30 #include "cifsproto.h"
31 #include "cifs_debug.h"
32 #include "cifs_fs_sb.h"
33 #include "cifs_unicode.h"
34 #include "fscache.h"
35 #include "smb2proto.h"
36
37 int
smb2_open_file(const unsigned int xid,struct cifs_open_parms * oparms,__u32 * oplock,FILE_ALL_INFO * buf)38 smb2_open_file(const unsigned int xid, struct cifs_open_parms *oparms,
39 __u32 *oplock, FILE_ALL_INFO *buf)
40 {
41 int rc;
42 __le16 *smb2_path;
43 struct smb2_file_all_info *smb2_data = NULL;
44 __u8 smb2_oplock;
45 struct cifs_fid *fid = oparms->fid;
46 struct network_resiliency_req nr_ioctl_req;
47
48 smb2_path = cifs_convert_path_to_utf16(oparms->path, oparms->cifs_sb);
49 if (smb2_path == NULL) {
50 rc = -ENOMEM;
51 goto out;
52 }
53
54 smb2_data = kzalloc(sizeof(struct smb2_file_all_info) + PATH_MAX * 2,
55 GFP_KERNEL);
56 if (smb2_data == NULL) {
57 rc = -ENOMEM;
58 goto out;
59 }
60
61 oparms->desired_access |= FILE_READ_ATTRIBUTES;
62 smb2_oplock = SMB2_OPLOCK_LEVEL_BATCH;
63
64 rc = SMB2_open(xid, oparms, smb2_path, &smb2_oplock, smb2_data, NULL,
65 NULL, NULL);
66 if (rc)
67 goto out;
68
69
70 if (oparms->tcon->use_resilient) {
71 /* default timeout is 0, servers pick default (120 seconds) */
72 nr_ioctl_req.Timeout =
73 cpu_to_le32(oparms->tcon->handle_timeout);
74 nr_ioctl_req.Reserved = 0;
75 rc = SMB2_ioctl(xid, oparms->tcon, fid->persistent_fid,
76 fid->volatile_fid, FSCTL_LMR_REQUEST_RESILIENCY,
77 (char *)&nr_ioctl_req, sizeof(nr_ioctl_req),
78 CIFSMaxBufSize, NULL, NULL /* no return info */);
79 if (rc == -EOPNOTSUPP) {
80 cifs_dbg(VFS,
81 "resiliency not supported by server, disabling\n");
82 oparms->tcon->use_resilient = false;
83 } else if (rc)
84 cifs_dbg(FYI, "error %d setting resiliency\n", rc);
85
86 rc = 0;
87 }
88
89 if (buf) {
90 /* if open response does not have IndexNumber field - get it */
91 if (smb2_data->IndexNumber == 0) {
92 rc = SMB2_get_srv_num(xid, oparms->tcon,
93 fid->persistent_fid,
94 fid->volatile_fid,
95 &smb2_data->IndexNumber);
96 if (rc) {
97 /*
98 * let get_inode_info disable server inode
99 * numbers
100 */
101 smb2_data->IndexNumber = 0;
102 rc = 0;
103 }
104 }
105 move_smb2_info_to_cifs(buf, smb2_data);
106 }
107
108 *oplock = smb2_oplock;
109 out:
110 kfree(smb2_data);
111 kfree(smb2_path);
112 return rc;
113 }
114
115 int
smb2_unlock_range(struct cifsFileInfo * cfile,struct file_lock * flock,const unsigned int xid)116 smb2_unlock_range(struct cifsFileInfo *cfile, struct file_lock *flock,
117 const unsigned int xid)
118 {
119 int rc = 0, stored_rc;
120 unsigned int max_num, num = 0, max_buf;
121 struct smb2_lock_element *buf, *cur;
122 struct cifs_tcon *tcon = tlink_tcon(cfile->tlink);
123 struct cifsInodeInfo *cinode = CIFS_I(d_inode(cfile->dentry));
124 struct cifsLockInfo *li, *tmp;
125 __u64 length = 1 + flock->fl_end - flock->fl_start;
126 struct list_head tmp_llist;
127
128 INIT_LIST_HEAD(&tmp_llist);
129
130 /*
131 * Accessing maxBuf is racy with cifs_reconnect - need to store value
132 * and check it before using.
133 */
134 max_buf = tcon->ses->server->maxBuf;
135 if (max_buf < sizeof(struct smb2_lock_element))
136 return -EINVAL;
137
138 BUILD_BUG_ON(sizeof(struct smb2_lock_element) > PAGE_SIZE);
139 max_buf = min_t(unsigned int, max_buf, PAGE_SIZE);
140 max_num = max_buf / sizeof(struct smb2_lock_element);
141 buf = kcalloc(max_num, sizeof(struct smb2_lock_element), GFP_KERNEL);
142 if (!buf)
143 return -ENOMEM;
144
145 cur = buf;
146
147 cifs_down_write(&cinode->lock_sem);
148 list_for_each_entry_safe(li, tmp, &cfile->llist->locks, llist) {
149 if (flock->fl_start > li->offset ||
150 (flock->fl_start + length) <
151 (li->offset + li->length))
152 continue;
153 if (current->tgid != li->pid)
154 /*
155 * flock and OFD lock are associated with an open
156 * file description, not the process.
157 */
158 if (!(flock->fl_flags & (FL_FLOCK | FL_OFDLCK)))
159 continue;
160 if (cinode->can_cache_brlcks) {
161 /*
162 * We can cache brlock requests - simply remove a lock
163 * from the file's list.
164 */
165 list_del(&li->llist);
166 cifs_del_lock_waiters(li);
167 kfree(li);
168 continue;
169 }
170 cur->Length = cpu_to_le64(li->length);
171 cur->Offset = cpu_to_le64(li->offset);
172 cur->Flags = cpu_to_le32(SMB2_LOCKFLAG_UNLOCK);
173 /*
174 * We need to save a lock here to let us add it again to the
175 * file's list if the unlock range request fails on the server.
176 */
177 list_move(&li->llist, &tmp_llist);
178 if (++num == max_num) {
179 stored_rc = smb2_lockv(xid, tcon,
180 cfile->fid.persistent_fid,
181 cfile->fid.volatile_fid,
182 current->tgid, num, buf);
183 if (stored_rc) {
184 /*
185 * We failed on the unlock range request - add
186 * all locks from the tmp list to the head of
187 * the file's list.
188 */
189 cifs_move_llist(&tmp_llist,
190 &cfile->llist->locks);
191 rc = stored_rc;
192 } else
193 /*
194 * The unlock range request succeed - free the
195 * tmp list.
196 */
197 cifs_free_llist(&tmp_llist);
198 cur = buf;
199 num = 0;
200 } else
201 cur++;
202 }
203 if (num) {
204 stored_rc = smb2_lockv(xid, tcon, cfile->fid.persistent_fid,
205 cfile->fid.volatile_fid, current->tgid,
206 num, buf);
207 if (stored_rc) {
208 cifs_move_llist(&tmp_llist, &cfile->llist->locks);
209 rc = stored_rc;
210 } else
211 cifs_free_llist(&tmp_llist);
212 }
213 up_write(&cinode->lock_sem);
214
215 kfree(buf);
216 return rc;
217 }
218
219 static int
smb2_push_mand_fdlocks(struct cifs_fid_locks * fdlocks,const unsigned int xid,struct smb2_lock_element * buf,unsigned int max_num)220 smb2_push_mand_fdlocks(struct cifs_fid_locks *fdlocks, const unsigned int xid,
221 struct smb2_lock_element *buf, unsigned int max_num)
222 {
223 int rc = 0, stored_rc;
224 struct cifsFileInfo *cfile = fdlocks->cfile;
225 struct cifsLockInfo *li;
226 unsigned int num = 0;
227 struct smb2_lock_element *cur = buf;
228 struct cifs_tcon *tcon = tlink_tcon(cfile->tlink);
229
230 list_for_each_entry(li, &fdlocks->locks, llist) {
231 cur->Length = cpu_to_le64(li->length);
232 cur->Offset = cpu_to_le64(li->offset);
233 cur->Flags = cpu_to_le32(li->type |
234 SMB2_LOCKFLAG_FAIL_IMMEDIATELY);
235 if (++num == max_num) {
236 stored_rc = smb2_lockv(xid, tcon,
237 cfile->fid.persistent_fid,
238 cfile->fid.volatile_fid,
239 current->tgid, num, buf);
240 if (stored_rc)
241 rc = stored_rc;
242 cur = buf;
243 num = 0;
244 } else
245 cur++;
246 }
247 if (num) {
248 stored_rc = smb2_lockv(xid, tcon,
249 cfile->fid.persistent_fid,
250 cfile->fid.volatile_fid,
251 current->tgid, num, buf);
252 if (stored_rc)
253 rc = stored_rc;
254 }
255
256 return rc;
257 }
258
259 int
smb2_push_mandatory_locks(struct cifsFileInfo * cfile)260 smb2_push_mandatory_locks(struct cifsFileInfo *cfile)
261 {
262 int rc = 0, stored_rc;
263 unsigned int xid;
264 unsigned int max_num, max_buf;
265 struct smb2_lock_element *buf;
266 struct cifsInodeInfo *cinode = CIFS_I(d_inode(cfile->dentry));
267 struct cifs_fid_locks *fdlocks;
268
269 xid = get_xid();
270
271 /*
272 * Accessing maxBuf is racy with cifs_reconnect - need to store value
273 * and check it for zero before using.
274 */
275 max_buf = tlink_tcon(cfile->tlink)->ses->server->maxBuf;
276 if (max_buf < sizeof(struct smb2_lock_element)) {
277 free_xid(xid);
278 return -EINVAL;
279 }
280
281 BUILD_BUG_ON(sizeof(struct smb2_lock_element) > PAGE_SIZE);
282 max_buf = min_t(unsigned int, max_buf, PAGE_SIZE);
283 max_num = max_buf / sizeof(struct smb2_lock_element);
284 buf = kcalloc(max_num, sizeof(struct smb2_lock_element), GFP_KERNEL);
285 if (!buf) {
286 free_xid(xid);
287 return -ENOMEM;
288 }
289
290 list_for_each_entry(fdlocks, &cinode->llist, llist) {
291 stored_rc = smb2_push_mand_fdlocks(fdlocks, xid, buf, max_num);
292 if (stored_rc)
293 rc = stored_rc;
294 }
295
296 kfree(buf);
297 free_xid(xid);
298 return rc;
299 }
300