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[17];
45 struct cifs_fid *fid = oparms->fid;
46
47 smb2_path = cifs_convert_path_to_utf16(oparms->path, oparms->cifs_sb);
48 if (smb2_path == NULL) {
49 rc = -ENOMEM;
50 goto out;
51 }
52
53 smb2_data = kzalloc(sizeof(struct smb2_file_all_info) + PATH_MAX * 2,
54 GFP_KERNEL);
55 if (smb2_data == NULL) {
56 rc = -ENOMEM;
57 goto out;
58 }
59
60 oparms->desired_access |= FILE_READ_ATTRIBUTES;
61 *smb2_oplock = SMB2_OPLOCK_LEVEL_BATCH;
62
63 if (oparms->tcon->ses->server->capabilities & SMB2_GLOBAL_CAP_LEASING)
64 memcpy(smb2_oplock + 1, fid->lease_key, SMB2_LEASE_KEY_SIZE);
65
66 rc = SMB2_open(xid, oparms, smb2_path, smb2_oplock, smb2_data, NULL);
67 if (rc)
68 goto out;
69
70 if (buf) {
71 /* open response does not have IndexNumber field - get it */
72 rc = SMB2_get_srv_num(xid, oparms->tcon, fid->persistent_fid,
73 fid->volatile_fid,
74 &smb2_data->IndexNumber);
75 if (rc) {
76 /* let get_inode_info disable server inode numbers */
77 smb2_data->IndexNumber = 0;
78 rc = 0;
79 }
80 move_smb2_info_to_cifs(buf, smb2_data);
81 }
82
83 *oplock = *smb2_oplock;
84 out:
85 kfree(smb2_data);
86 kfree(smb2_path);
87 return rc;
88 }
89
90 int
smb2_unlock_range(struct cifsFileInfo * cfile,struct file_lock * flock,const unsigned int xid)91 smb2_unlock_range(struct cifsFileInfo *cfile, struct file_lock *flock,
92 const unsigned int xid)
93 {
94 int rc = 0, stored_rc;
95 unsigned int max_num, num = 0, max_buf;
96 struct smb2_lock_element *buf, *cur;
97 struct cifs_tcon *tcon = tlink_tcon(cfile->tlink);
98 struct cifsInodeInfo *cinode = CIFS_I(d_inode(cfile->dentry));
99 struct cifsLockInfo *li, *tmp;
100 __u64 length = 1 + flock->fl_end - flock->fl_start;
101 struct list_head tmp_llist;
102
103 INIT_LIST_HEAD(&tmp_llist);
104
105 /*
106 * Accessing maxBuf is racy with cifs_reconnect - need to store value
107 * and check it for zero before using.
108 */
109 max_buf = tcon->ses->server->maxBuf;
110 if (!max_buf)
111 return -EINVAL;
112
113 max_num = max_buf / sizeof(struct smb2_lock_element);
114 buf = kcalloc(max_num, sizeof(struct smb2_lock_element), GFP_KERNEL);
115 if (!buf)
116 return -ENOMEM;
117
118 cur = buf;
119
120 down_write(&cinode->lock_sem);
121 list_for_each_entry_safe(li, tmp, &cfile->llist->locks, llist) {
122 if (flock->fl_start > li->offset ||
123 (flock->fl_start + length) <
124 (li->offset + li->length))
125 continue;
126 if (current->tgid != li->pid)
127 continue;
128 if (cinode->can_cache_brlcks) {
129 /*
130 * We can cache brlock requests - simply remove a lock
131 * from the file's list.
132 */
133 list_del(&li->llist);
134 cifs_del_lock_waiters(li);
135 kfree(li);
136 continue;
137 }
138 cur->Length = cpu_to_le64(li->length);
139 cur->Offset = cpu_to_le64(li->offset);
140 cur->Flags = cpu_to_le32(SMB2_LOCKFLAG_UNLOCK);
141 /*
142 * We need to save a lock here to let us add it again to the
143 * file's list if the unlock range request fails on the server.
144 */
145 list_move(&li->llist, &tmp_llist);
146 if (++num == max_num) {
147 stored_rc = smb2_lockv(xid, tcon,
148 cfile->fid.persistent_fid,
149 cfile->fid.volatile_fid,
150 current->tgid, num, buf);
151 if (stored_rc) {
152 /*
153 * We failed on the unlock range request - add
154 * all locks from the tmp list to the head of
155 * the file's list.
156 */
157 cifs_move_llist(&tmp_llist,
158 &cfile->llist->locks);
159 rc = stored_rc;
160 } else
161 /*
162 * The unlock range request succeed - free the
163 * tmp list.
164 */
165 cifs_free_llist(&tmp_llist);
166 cur = buf;
167 num = 0;
168 } else
169 cur++;
170 }
171 if (num) {
172 stored_rc = smb2_lockv(xid, tcon, cfile->fid.persistent_fid,
173 cfile->fid.volatile_fid, current->tgid,
174 num, buf);
175 if (stored_rc) {
176 cifs_move_llist(&tmp_llist, &cfile->llist->locks);
177 rc = stored_rc;
178 } else
179 cifs_free_llist(&tmp_llist);
180 }
181 up_write(&cinode->lock_sem);
182
183 kfree(buf);
184 return rc;
185 }
186
187 static int
smb2_push_mand_fdlocks(struct cifs_fid_locks * fdlocks,const unsigned int xid,struct smb2_lock_element * buf,unsigned int max_num)188 smb2_push_mand_fdlocks(struct cifs_fid_locks *fdlocks, const unsigned int xid,
189 struct smb2_lock_element *buf, unsigned int max_num)
190 {
191 int rc = 0, stored_rc;
192 struct cifsFileInfo *cfile = fdlocks->cfile;
193 struct cifsLockInfo *li;
194 unsigned int num = 0;
195 struct smb2_lock_element *cur = buf;
196 struct cifs_tcon *tcon = tlink_tcon(cfile->tlink);
197
198 list_for_each_entry(li, &fdlocks->locks, llist) {
199 cur->Length = cpu_to_le64(li->length);
200 cur->Offset = cpu_to_le64(li->offset);
201 cur->Flags = cpu_to_le32(li->type |
202 SMB2_LOCKFLAG_FAIL_IMMEDIATELY);
203 if (++num == max_num) {
204 stored_rc = smb2_lockv(xid, tcon,
205 cfile->fid.persistent_fid,
206 cfile->fid.volatile_fid,
207 current->tgid, num, buf);
208 if (stored_rc)
209 rc = stored_rc;
210 cur = buf;
211 num = 0;
212 } else
213 cur++;
214 }
215 if (num) {
216 stored_rc = smb2_lockv(xid, tcon,
217 cfile->fid.persistent_fid,
218 cfile->fid.volatile_fid,
219 current->tgid, num, buf);
220 if (stored_rc)
221 rc = stored_rc;
222 }
223
224 return rc;
225 }
226
227 int
smb2_push_mandatory_locks(struct cifsFileInfo * cfile)228 smb2_push_mandatory_locks(struct cifsFileInfo *cfile)
229 {
230 int rc = 0, stored_rc;
231 unsigned int xid;
232 unsigned int max_num, max_buf;
233 struct smb2_lock_element *buf;
234 struct cifsInodeInfo *cinode = CIFS_I(d_inode(cfile->dentry));
235 struct cifs_fid_locks *fdlocks;
236
237 xid = get_xid();
238
239 /*
240 * Accessing maxBuf is racy with cifs_reconnect - need to store value
241 * and check it for zero before using.
242 */
243 max_buf = tlink_tcon(cfile->tlink)->ses->server->maxBuf;
244 if (!max_buf) {
245 free_xid(xid);
246 return -EINVAL;
247 }
248
249 max_num = max_buf / sizeof(struct smb2_lock_element);
250 buf = kcalloc(max_num, sizeof(struct smb2_lock_element), GFP_KERNEL);
251 if (!buf) {
252 free_xid(xid);
253 return -ENOMEM;
254 }
255
256 list_for_each_entry(fdlocks, &cinode->llist, llist) {
257 stored_rc = smb2_push_mand_fdlocks(fdlocks, xid, buf, max_num);
258 if (stored_rc)
259 rc = stored_rc;
260 }
261
262 kfree(buf);
263 free_xid(xid);
264 return rc;
265 }
266