1 // SPDX-License-Identifier: LGPL-2.1
2 /*
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 */
9 #include <linux/fs.h>
10 #include <linux/stat.h>
11 #include <linux/slab.h>
12 #include <linux/pagemap.h>
13 #include <asm/div64.h>
14 #include "cifsfs.h"
15 #include "cifspdu.h"
16 #include "cifsglob.h"
17 #include "cifsproto.h"
18 #include "cifs_debug.h"
19 #include "cifs_fs_sb.h"
20 #include "cifs_unicode.h"
21 #include "fscache.h"
22 #include "smb2proto.h"
23
24 int
smb2_open_file(const unsigned int xid,struct cifs_open_parms * oparms,__u32 * oplock,FILE_ALL_INFO * buf)25 smb2_open_file(const unsigned int xid, struct cifs_open_parms *oparms,
26 __u32 *oplock, FILE_ALL_INFO *buf)
27 {
28 int rc;
29 __le16 *smb2_path;
30 struct smb2_file_all_info *smb2_data = NULL;
31 __u8 smb2_oplock;
32 struct cifs_fid *fid = oparms->fid;
33 struct network_resiliency_req nr_ioctl_req;
34
35 smb2_path = cifs_convert_path_to_utf16(oparms->path, oparms->cifs_sb);
36 if (smb2_path == NULL) {
37 rc = -ENOMEM;
38 goto out;
39 }
40
41 smb2_data = kzalloc(sizeof(struct smb2_file_all_info) + PATH_MAX * 2,
42 GFP_KERNEL);
43 if (smb2_data == NULL) {
44 rc = -ENOMEM;
45 goto out;
46 }
47
48 oparms->desired_access |= FILE_READ_ATTRIBUTES;
49 smb2_oplock = SMB2_OPLOCK_LEVEL_BATCH;
50
51 rc = SMB2_open(xid, oparms, smb2_path, &smb2_oplock, smb2_data, NULL,
52 NULL, NULL);
53 if (rc)
54 goto out;
55
56
57 if (oparms->tcon->use_resilient) {
58 /* default timeout is 0, servers pick default (120 seconds) */
59 nr_ioctl_req.Timeout =
60 cpu_to_le32(oparms->tcon->handle_timeout);
61 nr_ioctl_req.Reserved = 0;
62 rc = SMB2_ioctl(xid, oparms->tcon, fid->persistent_fid,
63 fid->volatile_fid, FSCTL_LMR_REQUEST_RESILIENCY,
64 (char *)&nr_ioctl_req, sizeof(nr_ioctl_req),
65 CIFSMaxBufSize, NULL, NULL /* no return info */);
66 if (rc == -EOPNOTSUPP) {
67 cifs_dbg(VFS,
68 "resiliency not supported by server, disabling\n");
69 oparms->tcon->use_resilient = false;
70 } else if (rc)
71 cifs_dbg(FYI, "error %d setting resiliency\n", rc);
72
73 rc = 0;
74 }
75
76 if (buf) {
77 /* if open response does not have IndexNumber field - get it */
78 if (smb2_data->IndexNumber == 0) {
79 rc = SMB2_get_srv_num(xid, oparms->tcon,
80 fid->persistent_fid,
81 fid->volatile_fid,
82 &smb2_data->IndexNumber);
83 if (rc) {
84 /*
85 * let get_inode_info disable server inode
86 * numbers
87 */
88 smb2_data->IndexNumber = 0;
89 rc = 0;
90 }
91 }
92 move_smb2_info_to_cifs(buf, smb2_data);
93 }
94
95 *oplock = smb2_oplock;
96 out:
97 kfree(smb2_data);
98 kfree(smb2_path);
99 return rc;
100 }
101
102 int
smb2_unlock_range(struct cifsFileInfo * cfile,struct file_lock * flock,const unsigned int xid)103 smb2_unlock_range(struct cifsFileInfo *cfile, struct file_lock *flock,
104 const unsigned int xid)
105 {
106 int rc = 0, stored_rc;
107 unsigned int max_num, num = 0, max_buf;
108 struct smb2_lock_element *buf, *cur;
109 struct cifs_tcon *tcon = tlink_tcon(cfile->tlink);
110 struct cifsInodeInfo *cinode = CIFS_I(d_inode(cfile->dentry));
111 struct cifsLockInfo *li, *tmp;
112 __u64 length = 1 + flock->fl_end - flock->fl_start;
113 struct list_head tmp_llist;
114
115 INIT_LIST_HEAD(&tmp_llist);
116
117 /*
118 * Accessing maxBuf is racy with cifs_reconnect - need to store value
119 * and check it before using.
120 */
121 max_buf = tcon->ses->server->maxBuf;
122 if (max_buf < sizeof(struct smb2_lock_element))
123 return -EINVAL;
124
125 BUILD_BUG_ON(sizeof(struct smb2_lock_element) > PAGE_SIZE);
126 max_buf = min_t(unsigned int, max_buf, PAGE_SIZE);
127 max_num = max_buf / sizeof(struct smb2_lock_element);
128 buf = kcalloc(max_num, sizeof(struct smb2_lock_element), GFP_KERNEL);
129 if (!buf)
130 return -ENOMEM;
131
132 cur = buf;
133
134 cifs_down_write(&cinode->lock_sem);
135 list_for_each_entry_safe(li, tmp, &cfile->llist->locks, llist) {
136 if (flock->fl_start > li->offset ||
137 (flock->fl_start + length) <
138 (li->offset + li->length))
139 continue;
140 if (current->tgid != li->pid)
141 /*
142 * flock and OFD lock are associated with an open
143 * file description, not the process.
144 */
145 if (!(flock->fl_flags & (FL_FLOCK | FL_OFDLCK)))
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
206 static int
smb2_push_mand_fdlocks(struct cifs_fid_locks * fdlocks,const unsigned int xid,struct smb2_lock_element * buf,unsigned int max_num)207 smb2_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
246 int
smb2_push_mandatory_locks(struct cifsFileInfo * cfile)247 smb2_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 BUILD_BUG_ON(sizeof(struct smb2_lock_element) > PAGE_SIZE);
269 max_buf = min_t(unsigned int, max_buf, PAGE_SIZE);
270 max_num = max_buf / sizeof(struct smb2_lock_element);
271 buf = kcalloc(max_num, sizeof(struct smb2_lock_element), GFP_KERNEL);
272 if (!buf) {
273 free_xid(xid);
274 return -ENOMEM;
275 }
276
277 list_for_each_entry(fdlocks, &cinode->llist, llist) {
278 stored_rc = smb2_push_mand_fdlocks(fdlocks, xid, buf, max_num);
279 if (stored_rc)
280 rc = stored_rc;
281 }
282
283 kfree(buf);
284 free_xid(xid);
285 return rc;
286 }
287