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_set_oplock_level(struct cifsInodeInfo *cinode, __u32 oplock)
41 if (oplock == SMB2_OPLOCK_LEVEL_EXCLUSIVE) {
42 cinode->clientCanCacheAll = true;
43 cinode->clientCanCacheRead = true;
44 cFYI(1, "Exclusive Oplock granted on inode %p",
46 } else if (oplock == SMB2_OPLOCK_LEVEL_II) {
47 cinode->clientCanCacheAll = false;
48 cinode->clientCanCacheRead = true;
49 cFYI(1, "Level II Oplock granted on inode %p",
52 cinode->clientCanCacheAll = false;
53 cinode->clientCanCacheRead = false;
58 smb2_open_file(const unsigned int xid, struct cifs_tcon *tcon, const char *path,
59 int disposition, int desired_access, int create_options,
60 struct cifs_fid *fid, __u32 *oplock, FILE_ALL_INFO *buf,
61 struct cifs_sb_info *cifs_sb)
65 struct smb2_file_all_info *smb2_data = NULL;
67 smb2_path = cifs_convert_path_to_utf16(path, cifs_sb);
68 if (smb2_path == NULL) {
73 smb2_data = kzalloc(sizeof(struct smb2_file_all_info) + MAX_NAME * 2,
75 if (smb2_data == NULL) {
80 desired_access |= FILE_READ_ATTRIBUTES;
81 *oplock = SMB2_OPLOCK_LEVEL_EXCLUSIVE;
83 rc = SMB2_open(xid, tcon, smb2_path, &fid->persistent_fid,
84 &fid->volatile_fid, desired_access, disposition,
85 0, 0, (__u8 *)oplock, smb2_data);
90 /* open response does not have IndexNumber field - get it */
91 rc = SMB2_get_srv_num(xid, tcon, fid->persistent_fid,
93 &smb2_data->IndexNumber);
95 /* let get_inode_info disable server inode numbers */
96 smb2_data->IndexNumber = 0;
99 move_smb2_info_to_cifs(buf, smb2_data);
109 smb2_unlock_range(struct cifsFileInfo *cfile, struct file_lock *flock,
110 const unsigned int xid)
112 int rc = 0, stored_rc;
113 unsigned int max_num, num = 0, max_buf;
114 struct smb2_lock_element *buf, *cur;
115 struct cifs_tcon *tcon = tlink_tcon(cfile->tlink);
116 struct cifsInodeInfo *cinode = CIFS_I(cfile->dentry->d_inode);
117 struct cifsLockInfo *li, *tmp;
118 __u64 length = 1 + flock->fl_end - flock->fl_start;
119 struct list_head tmp_llist;
121 INIT_LIST_HEAD(&tmp_llist);
124 * Accessing maxBuf is racy with cifs_reconnect - need to store value
125 * and check it for zero before using.
127 max_buf = tcon->ses->server->maxBuf;
131 max_num = max_buf / sizeof(struct smb2_lock_element);
132 buf = kzalloc(max_num * sizeof(struct smb2_lock_element), GFP_KERNEL);
138 down_write(&cinode->lock_sem);
139 list_for_each_entry_safe(li, tmp, &cfile->llist->locks, llist) {
140 if (flock->fl_start > li->offset ||
141 (flock->fl_start + length) <
142 (li->offset + li->length))
144 if (current->tgid != li->pid)
146 if (cinode->can_cache_brlcks) {
148 * We can cache brlock requests - simply remove a lock
149 * from the file's list.
151 list_del(&li->llist);
152 cifs_del_lock_waiters(li);
156 cur->Length = cpu_to_le64(li->length);
157 cur->Offset = cpu_to_le64(li->offset);
158 cur->Flags = cpu_to_le32(SMB2_LOCKFLAG_UNLOCK);
160 * We need to save a lock here to let us add it again to the
161 * file's list if the unlock range request fails on the server.
163 list_move(&li->llist, &tmp_llist);
164 if (++num == max_num) {
165 stored_rc = smb2_lockv(xid, tcon,
166 cfile->fid.persistent_fid,
167 cfile->fid.volatile_fid,
168 current->tgid, num, buf);
171 * We failed on the unlock range request - add
172 * all locks from the tmp list to the head of
175 cifs_move_llist(&tmp_llist,
176 &cfile->llist->locks);
180 * The unlock range request succeed - free the
183 cifs_free_llist(&tmp_llist);
190 stored_rc = smb2_lockv(xid, tcon, cfile->fid.persistent_fid,
191 cfile->fid.volatile_fid, current->tgid,
194 cifs_move_llist(&tmp_llist, &cfile->llist->locks);
197 cifs_free_llist(&tmp_llist);
199 up_write(&cinode->lock_sem);
206 smb2_push_mand_fdlocks(struct cifs_fid_locks *fdlocks, const unsigned int xid,
207 struct smb2_lock_element *buf, unsigned int max_num)
209 int rc = 0, stored_rc;
210 struct cifsFileInfo *cfile = fdlocks->cfile;
211 struct cifsLockInfo *li;
212 unsigned int num = 0;
213 struct smb2_lock_element *cur = buf;
214 struct cifs_tcon *tcon = tlink_tcon(cfile->tlink);
216 list_for_each_entry(li, &fdlocks->locks, llist) {
217 cur->Length = cpu_to_le64(li->length);
218 cur->Offset = cpu_to_le64(li->offset);
219 cur->Flags = cpu_to_le32(li->type |
220 SMB2_LOCKFLAG_FAIL_IMMEDIATELY);
221 if (++num == max_num) {
222 stored_rc = smb2_lockv(xid, tcon,
223 cfile->fid.persistent_fid,
224 cfile->fid.volatile_fid,
225 current->tgid, num, buf);
234 stored_rc = smb2_lockv(xid, tcon,
235 cfile->fid.persistent_fid,
236 cfile->fid.volatile_fid,
237 current->tgid, num, buf);
246 smb2_push_mandatory_locks(struct cifsFileInfo *cfile)
248 int rc = 0, stored_rc;
250 unsigned int max_num, max_buf;
251 struct smb2_lock_element *buf;
252 struct cifsInodeInfo *cinode = CIFS_I(cfile->dentry->d_inode);
253 struct cifs_fid_locks *fdlocks;
256 /* we are going to update can_cache_brlcks here - need a write access */
257 down_write(&cinode->lock_sem);
258 if (!cinode->can_cache_brlcks) {
259 up_write(&cinode->lock_sem);
265 * Accessing maxBuf is racy with cifs_reconnect - need to store value
266 * and check it for zero before using.
268 max_buf = tlink_tcon(cfile->tlink)->ses->server->maxBuf;
270 up_write(&cinode->lock_sem);
275 max_num = max_buf / sizeof(struct smb2_lock_element);
276 buf = kzalloc(max_num * sizeof(struct smb2_lock_element), GFP_KERNEL);
278 up_write(&cinode->lock_sem);
283 list_for_each_entry(fdlocks, &cinode->llist, llist) {
284 stored_rc = smb2_push_mand_fdlocks(fdlocks, xid, buf, max_num);
289 cinode->can_cache_brlcks = false;
292 up_write(&cinode->lock_sem);