1 // SPDX-License-Identifier: LGPL-2.1
5 * Copyright (C) International Business Machines Corp., 2002, 2011
6 * Author(s): Steve French (sfrench@us.ibm.com),
7 * Pavel Shilovsky ((pshilovsky@samba.org) 2012
11 #include <linux/stat.h>
12 #include <linux/slab.h>
13 #include <linux/pagemap.h>
14 #include <asm/div64.h>
18 #include "cifsproto.h"
19 #include "cifs_debug.h"
20 #include "cifs_fs_sb.h"
21 #include "cifs_unicode.h"
23 #include "smb2proto.h"
26 smb2_open_file(const unsigned int xid, struct cifs_open_parms *oparms,
27 __u32 *oplock, FILE_ALL_INFO *buf)
31 struct smb2_file_all_info *smb2_data = NULL;
33 struct cifs_fid *fid = oparms->fid;
34 struct network_resiliency_req nr_ioctl_req;
36 smb2_path = cifs_convert_path_to_utf16(oparms->path, oparms->cifs_sb);
37 if (smb2_path == NULL) {
42 smb2_data = kzalloc(sizeof(struct smb2_file_all_info) + PATH_MAX * 2,
44 if (smb2_data == NULL) {
49 oparms->desired_access |= FILE_READ_ATTRIBUTES;
50 smb2_oplock = SMB2_OPLOCK_LEVEL_BATCH;
52 rc = SMB2_open(xid, oparms, smb2_path, &smb2_oplock, smb2_data, NULL,
58 if (oparms->tcon->use_resilient) {
59 /* default timeout is 0, servers pick default (120 seconds) */
60 nr_ioctl_req.Timeout =
61 cpu_to_le32(oparms->tcon->handle_timeout);
62 nr_ioctl_req.Reserved = 0;
63 rc = SMB2_ioctl(xid, oparms->tcon, fid->persistent_fid,
64 fid->volatile_fid, FSCTL_LMR_REQUEST_RESILIENCY,
66 (char *)&nr_ioctl_req, sizeof(nr_ioctl_req),
67 CIFSMaxBufSize, NULL, NULL /* no return info */);
68 if (rc == -EOPNOTSUPP) {
70 "resiliency not supported by server, disabling\n");
71 oparms->tcon->use_resilient = false;
73 cifs_dbg(FYI, "error %d setting resiliency\n", rc);
79 /* if open response does not have IndexNumber field - get it */
80 if (smb2_data->IndexNumber == 0) {
81 rc = SMB2_get_srv_num(xid, oparms->tcon,
84 &smb2_data->IndexNumber);
87 * let get_inode_info disable server inode
90 smb2_data->IndexNumber = 0;
94 move_smb2_info_to_cifs(buf, smb2_data);
97 *oplock = smb2_oplock;
105 smb2_unlock_range(struct cifsFileInfo *cfile, struct file_lock *flock,
106 const unsigned int xid)
108 int rc = 0, stored_rc;
109 unsigned int max_num, num = 0, max_buf;
110 struct smb2_lock_element *buf, *cur;
111 struct cifs_tcon *tcon = tlink_tcon(cfile->tlink);
112 struct cifsInodeInfo *cinode = CIFS_I(d_inode(cfile->dentry));
113 struct cifsLockInfo *li, *tmp;
114 __u64 length = 1 + flock->fl_end - flock->fl_start;
115 struct list_head tmp_llist;
117 INIT_LIST_HEAD(&tmp_llist);
120 * Accessing maxBuf is racy with cifs_reconnect - need to store value
121 * and check it before using.
123 max_buf = tcon->ses->server->maxBuf;
124 if (max_buf < sizeof(struct smb2_lock_element))
127 BUILD_BUG_ON(sizeof(struct smb2_lock_element) > PAGE_SIZE);
128 max_buf = min_t(unsigned int, max_buf, PAGE_SIZE);
129 max_num = max_buf / sizeof(struct smb2_lock_element);
130 buf = kcalloc(max_num, sizeof(struct smb2_lock_element), GFP_KERNEL);
136 cifs_down_write(&cinode->lock_sem);
137 list_for_each_entry_safe(li, tmp, &cfile->llist->locks, llist) {
138 if (flock->fl_start > li->offset ||
139 (flock->fl_start + length) <
140 (li->offset + li->length))
142 if (current->tgid != li->pid)
144 * flock and OFD lock are associated with an open
145 * file description, not the process.
147 if (!(flock->fl_flags & (FL_FLOCK | FL_OFDLCK)))
149 if (cinode->can_cache_brlcks) {
151 * We can cache brlock requests - simply remove a lock
152 * from the file's list.
154 list_del(&li->llist);
155 cifs_del_lock_waiters(li);
159 cur->Length = cpu_to_le64(li->length);
160 cur->Offset = cpu_to_le64(li->offset);
161 cur->Flags = cpu_to_le32(SMB2_LOCKFLAG_UNLOCK);
163 * We need to save a lock here to let us add it again to the
164 * file's list if the unlock range request fails on the server.
166 list_move(&li->llist, &tmp_llist);
167 if (++num == max_num) {
168 stored_rc = smb2_lockv(xid, tcon,
169 cfile->fid.persistent_fid,
170 cfile->fid.volatile_fid,
171 current->tgid, num, buf);
174 * We failed on the unlock range request - add
175 * all locks from the tmp list to the head of
178 cifs_move_llist(&tmp_llist,
179 &cfile->llist->locks);
183 * The unlock range request succeed - free the
186 cifs_free_llist(&tmp_llist);
193 stored_rc = smb2_lockv(xid, tcon, cfile->fid.persistent_fid,
194 cfile->fid.volatile_fid, current->tgid,
197 cifs_move_llist(&tmp_llist, &cfile->llist->locks);
200 cifs_free_llist(&tmp_llist);
202 up_write(&cinode->lock_sem);
209 smb2_push_mand_fdlocks(struct cifs_fid_locks *fdlocks, const unsigned int xid,
210 struct smb2_lock_element *buf, unsigned int max_num)
212 int rc = 0, stored_rc;
213 struct cifsFileInfo *cfile = fdlocks->cfile;
214 struct cifsLockInfo *li;
215 unsigned int num = 0;
216 struct smb2_lock_element *cur = buf;
217 struct cifs_tcon *tcon = tlink_tcon(cfile->tlink);
219 list_for_each_entry(li, &fdlocks->locks, llist) {
220 cur->Length = cpu_to_le64(li->length);
221 cur->Offset = cpu_to_le64(li->offset);
222 cur->Flags = cpu_to_le32(li->type |
223 SMB2_LOCKFLAG_FAIL_IMMEDIATELY);
224 if (++num == max_num) {
225 stored_rc = smb2_lockv(xid, tcon,
226 cfile->fid.persistent_fid,
227 cfile->fid.volatile_fid,
228 current->tgid, num, buf);
237 stored_rc = smb2_lockv(xid, tcon,
238 cfile->fid.persistent_fid,
239 cfile->fid.volatile_fid,
240 current->tgid, num, buf);
249 smb2_push_mandatory_locks(struct cifsFileInfo *cfile)
251 int rc = 0, stored_rc;
253 unsigned int max_num, max_buf;
254 struct smb2_lock_element *buf;
255 struct cifsInodeInfo *cinode = CIFS_I(d_inode(cfile->dentry));
256 struct cifs_fid_locks *fdlocks;
261 * Accessing maxBuf is racy with cifs_reconnect - need to store value
262 * and check it for zero before using.
264 max_buf = tlink_tcon(cfile->tlink)->ses->server->maxBuf;
265 if (max_buf < sizeof(struct smb2_lock_element)) {
270 BUILD_BUG_ON(sizeof(struct smb2_lock_element) > PAGE_SIZE);
271 max_buf = min_t(unsigned int, max_buf, PAGE_SIZE);
272 max_num = max_buf / sizeof(struct smb2_lock_element);
273 buf = kcalloc(max_num, sizeof(struct smb2_lock_element), GFP_KERNEL);
279 list_for_each_entry(fdlocks, &cinode->llist, llist) {
280 stored_rc = smb2_push_mand_fdlocks(fdlocks, xid, buf, max_num);