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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
37int
38smb2_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[17];
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 if (oparms->tcon->ses->server->capabilities & SMB2_GLOBAL_CAP_LEASING)
65 memcpy(smb2_oplock + 1, fid->lease_key, SMB2_LEASE_KEY_SIZE);
66
67 rc = SMB2_open(xid, oparms, smb2_path, smb2_oplock, smb2_data, NULL);
68 if (rc)
69 goto out;
70
71
72 if (oparms->tcon->use_resilient) {
73 nr_ioctl_req.Timeout = 0; /* use server default (120 seconds) */
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 true /* is_fsctl */,
78 (char *)&nr_ioctl_req, sizeof(nr_ioctl_req),
79 NULL, NULL /* no return info */);
80 if (rc == -EOPNOTSUPP) {
81 cifs_dbg(VFS,
82 "resiliency not supported by server, disabling\n");
83 oparms->tcon->use_resilient = false;
84 } else if (rc)
85 cifs_dbg(FYI, "error %d setting resiliency\n", rc);
86
87 rc = 0;
88 }
89
90 if (buf) {
91 /* open response does not have IndexNumber field - get it */
92 rc = SMB2_get_srv_num(xid, oparms->tcon, fid->persistent_fid,
93 fid->volatile_fid,
94 &smb2_data->IndexNumber);
95 if (rc) {
96 /* let get_inode_info disable server inode numbers */
97 smb2_data->IndexNumber = 0;
98 rc = 0;
99 }
100 move_smb2_info_to_cifs(buf, smb2_data);
101 }
102
103 *oplock = *smb2_oplock;
104out:
105 kfree(smb2_data);
106 kfree(smb2_path);
107 return rc;
108}
109
110int
111smb2_unlock_range(struct cifsFileInfo *cfile, struct file_lock *flock,
112 const unsigned int xid)
113{
114 int rc = 0, stored_rc;
115 unsigned int max_num, num = 0, max_buf;
116 struct smb2_lock_element *buf, *cur;
117 struct cifs_tcon *tcon = tlink_tcon(cfile->tlink);
118 struct cifsInodeInfo *cinode = CIFS_I(d_inode(cfile->dentry));
119 struct cifsLockInfo *li, *tmp;
120 __u64 length = 1 + flock->fl_end - flock->fl_start;
121 struct list_head tmp_llist;
122
123 INIT_LIST_HEAD(&tmp_llist);
124
125 /*
126 * Accessing maxBuf is racy with cifs_reconnect - need to store value
127 * and check it for zero before using.
128 */
129 max_buf = tcon->ses->server->maxBuf;
130 if (!max_buf)
131 return -EINVAL;
132
133 max_num = max_buf / sizeof(struct smb2_lock_element);
134 buf = kcalloc(max_num, sizeof(struct smb2_lock_element), GFP_KERNEL);
135 if (!buf)
136 return -ENOMEM;
137
138 cur = buf;
139
140 down_write(&cinode->lock_sem);
141 list_for_each_entry_safe(li, tmp, &cfile->llist->locks, llist) {
142 if (flock->fl_start > li->offset ||
143 (flock->fl_start + length) <
144 (li->offset + li->length))
145 continue;
146 if (current->tgid != li->pid)
147 continue;
148 if (cinode->can_cache_brlcks) {
149 /*
150 * We can cache brlock requests - simply remove a lock
151 * from the file's list.
152 */
153 list_del(&li->llist);
154 cifs_del_lock_waiters(li);
155 kfree(li);
156 continue;
157 }
158 cur->Length = cpu_to_le64(li->length);
159 cur->Offset = cpu_to_le64(li->offset);
160 cur->Flags = cpu_to_le32(SMB2_LOCKFLAG_UNLOCK);
161 /*
162 * We need to save a lock here to let us add it again to the
163 * file's list if the unlock range request fails on the server.
164 */
165 list_move(&li->llist, &tmp_llist);
166 if (++num == max_num) {
167 stored_rc = smb2_lockv(xid, tcon,
168 cfile->fid.persistent_fid,
169 cfile->fid.volatile_fid,
170 current->tgid, num, buf);
171 if (stored_rc) {
172 /*
173 * We failed on the unlock range request - add
174 * all locks from the tmp list to the head of
175 * the file's list.
176 */
177 cifs_move_llist(&tmp_llist,
178 &cfile->llist->locks);
179 rc = stored_rc;
180 } else
181 /*
182 * The unlock range request succeed - free the
183 * tmp list.
184 */
185 cifs_free_llist(&tmp_llist);
186 cur = buf;
187 num = 0;
188 } else
189 cur++;
190 }
191 if (num) {
192 stored_rc = smb2_lockv(xid, tcon, cfile->fid.persistent_fid,
193 cfile->fid.volatile_fid, current->tgid,
194 num, buf);
195 if (stored_rc) {
196 cifs_move_llist(&tmp_llist, &cfile->llist->locks);
197 rc = stored_rc;
198 } else
199 cifs_free_llist(&tmp_llist);
200 }
201 up_write(&cinode->lock_sem);
202
203 kfree(buf);
204 return rc;
205}
206
207static int
208smb2_push_mand_fdlocks(struct cifs_fid_locks *fdlocks, const unsigned int xid,
209 struct smb2_lock_element *buf, unsigned int max_num)
210{
211 int rc = 0, stored_rc;
212 struct cifsFileInfo *cfile = fdlocks->cfile;
213 struct cifsLockInfo *li;
214 unsigned int num = 0;
215 struct smb2_lock_element *cur = buf;
216 struct cifs_tcon *tcon = tlink_tcon(cfile->tlink);
217
218 list_for_each_entry(li, &fdlocks->locks, llist) {
219 cur->Length = cpu_to_le64(li->length);
220 cur->Offset = cpu_to_le64(li->offset);
221 cur->Flags = cpu_to_le32(li->type |
222 SMB2_LOCKFLAG_FAIL_IMMEDIATELY);
223 if (++num == max_num) {
224 stored_rc = smb2_lockv(xid, tcon,
225 cfile->fid.persistent_fid,
226 cfile->fid.volatile_fid,
227 current->tgid, num, buf);
228 if (stored_rc)
229 rc = stored_rc;
230 cur = buf;
231 num = 0;
232 } else
233 cur++;
234 }
235 if (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 }
243
244 return rc;
245}
246
247int
248smb2_push_mandatory_locks(struct cifsFileInfo *cfile)
249{
250 int rc = 0, stored_rc;
251 unsigned int xid;
252 unsigned int max_num, max_buf;
253 struct smb2_lock_element *buf;
254 struct cifsInodeInfo *cinode = CIFS_I(d_inode(cfile->dentry));
255 struct cifs_fid_locks *fdlocks;
256
257 xid = get_xid();
258
259 /*
260 * Accessing maxBuf is racy with cifs_reconnect - need to store value
261 * and check it for zero before using.
262 */
263 max_buf = tlink_tcon(cfile->tlink)->ses->server->maxBuf;
264 if (max_buf < sizeof(struct smb2_lock_element)) {
265 free_xid(xid);
266 return -EINVAL;
267 }
268
269 max_num = max_buf / sizeof(struct smb2_lock_element);
270 buf = kcalloc(max_num, sizeof(struct smb2_lock_element), GFP_KERNEL);
271 if (!buf) {
272 free_xid(xid);
273 return -ENOMEM;
274 }
275
276 list_for_each_entry(fdlocks, &cinode->llist, llist) {
277 stored_rc = smb2_push_mand_fdlocks(fdlocks, xid, buf, max_num);
278 if (stored_rc)
279 rc = stored_rc;
280 }
281
282 kfree(buf);
283 free_xid(xid);
284 return rc;
285}