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
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.
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.
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
23 #include <linux/stat.h>
24 #include <linux/slab.h>
25 #include <linux/pagemap.h>
26 #include <asm/div64.h>
30 #include "cifsproto.h"
31 #include "cifs_debug.h"
32 #include "cifs_fs_sb.h"
33 #include "cifs_unicode.h"
35 #include "smb2proto.h"
38 smb2_open_file(const unsigned int xid, struct cifs_open_parms *oparms,
39 __u32 *oplock, FILE_ALL_INFO *buf)
43 struct smb2_file_all_info *smb2_data = NULL;
45 struct cifs_fid *fid = oparms->fid;
46 struct network_resiliency_req nr_ioctl_req;
48 smb2_path = cifs_convert_path_to_utf16(oparms->path, oparms->cifs_sb);
49 if (smb2_path == NULL) {
54 smb2_data = kzalloc(sizeof(struct smb2_file_all_info) + PATH_MAX * 2,
56 if (smb2_data == NULL) {
61 oparms->desired_access |= FILE_READ_ATTRIBUTES;
62 smb2_oplock = SMB2_OPLOCK_LEVEL_BATCH;
64 rc = SMB2_open(xid, oparms, smb2_path, &smb2_oplock, smb2_data, NULL,
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) {
81 "resiliency not supported by server, disabling\n");
82 oparms->tcon->use_resilient = false;
84 cifs_dbg(FYI, "error %d setting resiliency\n", rc);
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,
95 &smb2_data->IndexNumber);
98 * let get_inode_info disable server inode
101 smb2_data->IndexNumber = 0;
105 move_smb2_info_to_cifs(buf, smb2_data);
108 *oplock = smb2_oplock;
116 smb2_unlock_range(struct cifsFileInfo *cfile, struct file_lock *flock,
117 const unsigned int xid)
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;
128 INIT_LIST_HEAD(&tmp_llist);
131 * Accessing maxBuf is racy with cifs_reconnect - need to store value
132 * and check it before using.
134 max_buf = tcon->ses->server->maxBuf;
135 if (max_buf < sizeof(struct smb2_lock_element))
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);
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))
153 if (current->tgid != li->pid)
155 * flock and OFD lock are associated with an open
156 * file description, not the process.
158 if (!(flock->fl_flags & (FL_FLOCK | FL_OFDLCK)))
160 if (cinode->can_cache_brlcks) {
162 * We can cache brlock requests - simply remove a lock
163 * from the file's list.
165 list_del(&li->llist);
166 cifs_del_lock_waiters(li);
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);
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.
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);
185 * We failed on the unlock range request - add
186 * all locks from the tmp list to the head of
189 cifs_move_llist(&tmp_llist,
190 &cfile->llist->locks);
194 * The unlock range request succeed - free the
197 cifs_free_llist(&tmp_llist);
204 stored_rc = smb2_lockv(xid, tcon, cfile->fid.persistent_fid,
205 cfile->fid.volatile_fid, current->tgid,
208 cifs_move_llist(&tmp_llist, &cfile->llist->locks);
211 cifs_free_llist(&tmp_llist);
213 up_write(&cinode->lock_sem);
220 smb2_push_mand_fdlocks(struct cifs_fid_locks *fdlocks, const unsigned int xid,
221 struct smb2_lock_element *buf, unsigned int max_num)
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);
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);
248 stored_rc = smb2_lockv(xid, tcon,
249 cfile->fid.persistent_fid,
250 cfile->fid.volatile_fid,
251 current->tgid, num, buf);
260 smb2_push_mandatory_locks(struct cifsFileInfo *cfile)
262 int rc = 0, stored_rc;
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;
272 * Accessing maxBuf is racy with cifs_reconnect - need to store value
273 * and check it for zero before using.
275 max_buf = tlink_tcon(cfile->tlink)->ses->server->maxBuf;
276 if (max_buf < sizeof(struct smb2_lock_element)) {
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);
290 list_for_each_entry(fdlocks, &cinode->llist, llist) {
291 stored_rc = smb2_push_mand_fdlocks(fdlocks, xid, buf, max_num);