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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, true,
77 (char *)&nr_ioctl_req, sizeof(nr_ioctl_req),
78 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 /* open response does not have IndexNumber field - get it */
91 rc = SMB2_get_srv_num(xid, oparms->tcon, fid->persistent_fid,
92 fid->volatile_fid,
93 &smb2_data->IndexNumber);
94 if (rc) {
95 /* let get_inode_info disable server inode numbers */
96 smb2_data->IndexNumber = 0;
97 rc = 0;
98 }
99 move_smb2_info_to_cifs(buf, smb2_data);
100 }
101
102 *oplock = *smb2_oplock;
103out:
104 kfree(smb2_data);
105 kfree(smb2_path);
106 return rc;
107}
108
109int
110smb2_unlock_range(struct cifsFileInfo *cfile, struct file_lock *flock,
111 const unsigned int xid)
112{
113 int rc = 0, stored_rc;
114 unsigned int max_num, num = 0, max_buf;
115 struct smb2_lock_element *buf, *cur;
116 struct cifs_tcon *tcon = tlink_tcon(cfile->tlink);
117 struct cifsInodeInfo *cinode = CIFS_I(d_inode(cfile->dentry));
118 struct cifsLockInfo *li, *tmp;
119 __u64 length = 1 + flock->fl_end - flock->fl_start;
120 struct list_head tmp_llist;
121
122 INIT_LIST_HEAD(&tmp_llist);
123
124 /*
125 * Accessing maxBuf is racy with cifs_reconnect - need to store value
126 * and check it for zero before using.
127 */
128 max_buf = tcon->ses->server->maxBuf;
129 if (!max_buf)
130 return -EINVAL;
131
132 max_num = max_buf / sizeof(struct smb2_lock_element);
133 buf = kcalloc(max_num, sizeof(struct smb2_lock_element), GFP_KERNEL);
134 if (!buf)
135 return -ENOMEM;
136
137 cur = buf;
138
139 down_write(&cinode->lock_sem);
140 list_for_each_entry_safe(li, tmp, &cfile->llist->locks, llist) {
141 if (flock->fl_start > li->offset ||
142 (flock->fl_start + length) <
143 (li->offset + li->length))
144 continue;
145 if (current->tgid != li->pid)
146 continue;
147 if (cinode->can_cache_brlcks) {
148 /*
149 * We can cache brlock requests - simply remove a lock
150 * from the file's list.
151 */
152 list_del(&li->llist);
153 cifs_del_lock_waiters(li);
154 kfree(li);
155 continue;
156 }
157 cur->Length = cpu_to_le64(li->length);
158 cur->Offset = cpu_to_le64(li->offset);
159 cur->Flags = cpu_to_le32(SMB2_LOCKFLAG_UNLOCK);
160 /*
161 * We need to save a lock here to let us add it again to the
162 * file's list if the unlock range request fails on the server.
163 */
164 list_move(&li->llist, &tmp_llist);
165 if (++num == max_num) {
166 stored_rc = smb2_lockv(xid, tcon,
167 cfile->fid.persistent_fid,
168 cfile->fid.volatile_fid,
169 current->tgid, num, buf);
170 if (stored_rc) {
171 /*
172 * We failed on the unlock range request - add
173 * all locks from the tmp list to the head of
174 * the file's list.
175 */
176 cifs_move_llist(&tmp_llist,
177 &cfile->llist->locks);
178 rc = stored_rc;
179 } else
180 /*
181 * The unlock range request succeed - free the
182 * tmp list.
183 */
184 cifs_free_llist(&tmp_llist);
185 cur = buf;
186 num = 0;
187 } else
188 cur++;
189 }
190 if (num) {
191 stored_rc = smb2_lockv(xid, tcon, cfile->fid.persistent_fid,
192 cfile->fid.volatile_fid, current->tgid,
193 num, buf);
194 if (stored_rc) {
195 cifs_move_llist(&tmp_llist, &cfile->llist->locks);
196 rc = stored_rc;
197 } else
198 cifs_free_llist(&tmp_llist);
199 }
200 up_write(&cinode->lock_sem);
201
202 kfree(buf);
203 return rc;
204}
205
206static int
207smb2_push_mand_fdlocks(struct cifs_fid_locks *fdlocks, const unsigned int xid,
208 struct smb2_lock_element *buf, unsigned int max_num)
209{
210 int rc = 0, stored_rc;
211 struct cifsFileInfo *cfile = fdlocks->cfile;
212 struct cifsLockInfo *li;
213 unsigned int num = 0;
214 struct smb2_lock_element *cur = buf;
215 struct cifs_tcon *tcon = tlink_tcon(cfile->tlink);
216
217 list_for_each_entry(li, &fdlocks->locks, llist) {
218 cur->Length = cpu_to_le64(li->length);
219 cur->Offset = cpu_to_le64(li->offset);
220 cur->Flags = cpu_to_le32(li->type |
221 SMB2_LOCKFLAG_FAIL_IMMEDIATELY);
222 if (++num == max_num) {
223 stored_rc = smb2_lockv(xid, tcon,
224 cfile->fid.persistent_fid,
225 cfile->fid.volatile_fid,
226 current->tgid, num, buf);
227 if (stored_rc)
228 rc = stored_rc;
229 cur = buf;
230 num = 0;
231 } else
232 cur++;
233 }
234 if (num) {
235 stored_rc = smb2_lockv(xid, tcon,
236 cfile->fid.persistent_fid,
237 cfile->fid.volatile_fid,
238 current->tgid, num, buf);
239 if (stored_rc)
240 rc = stored_rc;
241 }
242
243 return rc;
244}
245
246int
247smb2_push_mandatory_locks(struct cifsFileInfo *cfile)
248{
249 int rc = 0, stored_rc;
250 unsigned int xid;
251 unsigned int max_num, max_buf;
252 struct smb2_lock_element *buf;
253 struct cifsInodeInfo *cinode = CIFS_I(d_inode(cfile->dentry));
254 struct cifs_fid_locks *fdlocks;
255
256 xid = get_xid();
257
258 /*
259 * Accessing maxBuf is racy with cifs_reconnect - need to store value
260 * and check it for zero before using.
261 */
262 max_buf = tlink_tcon(cfile->tlink)->ses->server->maxBuf;
263 if (max_buf < sizeof(struct smb2_lock_element)) {
264 free_xid(xid);
265 return -EINVAL;
266 }
267
268 max_num = max_buf / sizeof(struct smb2_lock_element);
269 buf = kcalloc(max_num, sizeof(struct smb2_lock_element), GFP_KERNEL);
270 if (!buf) {
271 free_xid(xid);
272 return -ENOMEM;
273 }
274
275 list_for_each_entry(fdlocks, &cinode->llist, llist) {
276 stored_rc = smb2_push_mand_fdlocks(fdlocks, xid, buf, max_num);
277 if (stored_rc)
278 rc = stored_rc;
279 }
280
281 kfree(buf);
282 free_xid(xid);
283 return rc;
284}