~ [ source navigation ] ~ [ diff markup ] ~ [ identifier search ] ~

TOMOYO Linux Cross Reference
Linux/fs/cifs/smb2file.c

Version: ~ [ linux-5.15-rc7 ] ~ [ linux-5.14.14 ] ~ [ linux-5.13.19 ] ~ [ linux-5.12.19 ] ~ [ linux-5.11.22 ] ~ [ linux-5.10.75 ] ~ [ linux-5.9.16 ] ~ [ linux-5.8.18 ] ~ [ linux-5.7.19 ] ~ [ linux-5.6.19 ] ~ [ linux-5.5.19 ] ~ [ linux-5.4.155 ] ~ [ linux-5.3.18 ] ~ [ linux-5.2.21 ] ~ [ linux-5.1.21 ] ~ [ linux-5.0.21 ] ~ [ linux-4.20.17 ] ~ [ linux-4.19.213 ] ~ [ linux-4.18.20 ] ~ [ linux-4.17.19 ] ~ [ linux-4.16.18 ] ~ [ linux-4.15.18 ] ~ [ linux-4.14.252 ] ~ [ linux-4.13.16 ] ~ [ linux-4.12.14 ] ~ [ linux-4.11.12 ] ~ [ linux-4.10.17 ] ~ [ linux-4.9.287 ] ~ [ linux-4.8.17 ] ~ [ linux-4.7.10 ] ~ [ linux-4.6.7 ] ~ [ linux-4.5.7 ] ~ [ linux-4.4.289 ] ~ [ linux-4.3.6 ] ~ [ linux-4.2.8 ] ~ [ linux-4.1.52 ] ~ [ linux-4.0.9 ] ~ [ linux-3.18.140 ] ~ [ linux-3.16.85 ] ~ [ linux-3.14.79 ] ~ [ linux-3.12.74 ] ~ [ linux-3.10.108 ] ~ [ linux-2.6.32.71 ] ~ [ linux-2.6.0 ] ~ [ linux-2.4.37.11 ] ~ [ unix-v6-master ] ~ [ ccs-tools-1.8.5 ] ~ [ policy-sample ] ~
Architecture: ~ [ i386 ] ~ [ alpha ] ~ [ m68k ] ~ [ mips ] ~ [ ppc ] ~ [ sparc ] ~ [ sparc64 ] ~

  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
 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         struct network_resiliency_req nr_ioctl_req;
 47 
 48         smb2_path = cifs_convert_path_to_utf16(oparms->path, oparms->cifs_sb);
 49         if (smb2_path == NULL) {
 50                 rc = -ENOMEM;
 51                 goto out;
 52         }
 53 
 54         smb2_data = kzalloc(sizeof(struct smb2_file_all_info) + PATH_MAX * 2,
 55                             GFP_KERNEL);
 56         if (smb2_data == NULL) {
 57                 rc = -ENOMEM;
 58                 goto out;
 59         }
 60 
 61         oparms->desired_access |= FILE_READ_ATTRIBUTES;
 62         *smb2_oplock = SMB2_OPLOCK_LEVEL_BATCH;
 63 
 64         if (oparms->tcon->ses->server->capabilities & SMB2_GLOBAL_CAP_LEASING)
 65                 memcpy(smb2_oplock + 1, fid->lease_key, SMB2_LEASE_KEY_SIZE);
 66 
 67         rc = SMB2_open(xid, oparms, smb2_path, smb2_oplock, smb2_data, NULL);
 68         if (rc)
 69                 goto out;
 70 
 71 
 72          if (oparms->tcon->use_resilient) {
 73                 nr_ioctl_req.Timeout = 0; /* use server default (120 seconds) */
 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                         true /* is_fsctl */, false /* use_ipc */,
 78                         (char *)&nr_ioctl_req, sizeof(nr_ioctl_req),
 79                         NULL, NULL /* no return info */);
 80                 if (rc == -EOPNOTSUPP) {
 81                         cifs_dbg(VFS,
 82                              "resiliency not supported by server, disabling\n");
 83                         oparms->tcon->use_resilient = false;
 84                 } else if (rc)
 85                         cifs_dbg(FYI, "error %d setting resiliency\n", rc);
 86 
 87                 rc = 0;
 88         }
 89 
 90         if (buf) {
 91                 /* open response does not have IndexNumber field - get it */
 92                 rc = SMB2_get_srv_num(xid, oparms->tcon, fid->persistent_fid,
 93                                       fid->volatile_fid,
 94                                       &smb2_data->IndexNumber);
 95                 if (rc) {
 96                         /* let get_inode_info disable server inode numbers */
 97                         smb2_data->IndexNumber = 0;
 98                         rc = 0;
 99                 }
100                 move_smb2_info_to_cifs(buf, smb2_data);
101         }
102 
103         *oplock = *smb2_oplock;
104 out:
105         kfree(smb2_data);
106         kfree(smb2_path);
107         return rc;
108 }
109 
110 int
111 smb2_unlock_range(struct cifsFileInfo *cfile, struct file_lock *flock,
112                   const unsigned int xid)
113 {
114         int rc = 0, stored_rc;
115         unsigned int max_num, num = 0, max_buf;
116         struct smb2_lock_element *buf, *cur;
117         struct cifs_tcon *tcon = tlink_tcon(cfile->tlink);
118         struct cifsInodeInfo *cinode = CIFS_I(d_inode(cfile->dentry));
119         struct cifsLockInfo *li, *tmp;
120         __u64 length = 1 + flock->fl_end - flock->fl_start;
121         struct list_head tmp_llist;
122 
123         INIT_LIST_HEAD(&tmp_llist);
124 
125         /*
126          * Accessing maxBuf is racy with cifs_reconnect - need to store value
127          * and check it for zero before using.
128          */
129         max_buf = tcon->ses->server->maxBuf;
130         if (!max_buf)
131                 return -EINVAL;
132 
133         max_num = max_buf / sizeof(struct smb2_lock_element);
134         buf = kcalloc(max_num, sizeof(struct smb2_lock_element), GFP_KERNEL);
135         if (!buf)
136                 return -ENOMEM;
137 
138         cur = buf;
139 
140         down_write(&cinode->lock_sem);
141         list_for_each_entry_safe(li, tmp, &cfile->llist->locks, llist) {
142                 if (flock->fl_start > li->offset ||
143                     (flock->fl_start + length) <
144                     (li->offset + li->length))
145                         continue;
146                 if (current->tgid != li->pid)
147                         continue;
148                 if (cinode->can_cache_brlcks) {
149                         /*
150                          * We can cache brlock requests - simply remove a lock
151                          * from the file's list.
152                          */
153                         list_del(&li->llist);
154                         cifs_del_lock_waiters(li);
155                         kfree(li);
156                         continue;
157                 }
158                 cur->Length = cpu_to_le64(li->length);
159                 cur->Offset = cpu_to_le64(li->offset);
160                 cur->Flags = cpu_to_le32(SMB2_LOCKFLAG_UNLOCK);
161                 /*
162                  * We need to save a lock here to let us add it again to the
163                  * file's list if the unlock range request fails on the server.
164                  */
165                 list_move(&li->llist, &tmp_llist);
166                 if (++num == max_num) {
167                         stored_rc = smb2_lockv(xid, tcon,
168                                                cfile->fid.persistent_fid,
169                                                cfile->fid.volatile_fid,
170                                                current->tgid, num, buf);
171                         if (stored_rc) {
172                                 /*
173                                  * We failed on the unlock range request - add
174                                  * all locks from the tmp list to the head of
175                                  * the file's list.
176                                  */
177                                 cifs_move_llist(&tmp_llist,
178                                                 &cfile->llist->locks);
179                                 rc = stored_rc;
180                         } else
181                                 /*
182                                  * The unlock range request succeed - free the
183                                  * tmp list.
184                                  */
185                                 cifs_free_llist(&tmp_llist);
186                         cur = buf;
187                         num = 0;
188                 } else
189                         cur++;
190         }
191         if (num) {
192                 stored_rc = smb2_lockv(xid, tcon, cfile->fid.persistent_fid,
193                                        cfile->fid.volatile_fid, current->tgid,
194                                        num, buf);
195                 if (stored_rc) {
196                         cifs_move_llist(&tmp_llist, &cfile->llist->locks);
197                         rc = stored_rc;
198                 } else
199                         cifs_free_llist(&tmp_llist);
200         }
201         up_write(&cinode->lock_sem);
202 
203         kfree(buf);
204         return rc;
205 }
206 
207 static int
208 smb2_push_mand_fdlocks(struct cifs_fid_locks *fdlocks, const unsigned int xid,
209                        struct smb2_lock_element *buf, unsigned int max_num)
210 {
211         int rc = 0, stored_rc;
212         struct cifsFileInfo *cfile = fdlocks->cfile;
213         struct cifsLockInfo *li;
214         unsigned int num = 0;
215         struct smb2_lock_element *cur = buf;
216         struct cifs_tcon *tcon = tlink_tcon(cfile->tlink);
217 
218         list_for_each_entry(li, &fdlocks->locks, llist) {
219                 cur->Length = cpu_to_le64(li->length);
220                 cur->Offset = cpu_to_le64(li->offset);
221                 cur->Flags = cpu_to_le32(li->type |
222                                                 SMB2_LOCKFLAG_FAIL_IMMEDIATELY);
223                 if (++num == max_num) {
224                         stored_rc = smb2_lockv(xid, tcon,
225                                                cfile->fid.persistent_fid,
226                                                cfile->fid.volatile_fid,
227                                                current->tgid, num, buf);
228                         if (stored_rc)
229                                 rc = stored_rc;
230                         cur = buf;
231                         num = 0;
232                 } else
233                         cur++;
234         }
235         if (num) {
236                 stored_rc = smb2_lockv(xid, tcon,
237                                        cfile->fid.persistent_fid,
238                                        cfile->fid.volatile_fid,
239                                        current->tgid, num, buf);
240                 if (stored_rc)
241                         rc = stored_rc;
242         }
243 
244         return rc;
245 }
246 
247 int
248 smb2_push_mandatory_locks(struct cifsFileInfo *cfile)
249 {
250         int rc = 0, stored_rc;
251         unsigned int xid;
252         unsigned int max_num, max_buf;
253         struct smb2_lock_element *buf;
254         struct cifsInodeInfo *cinode = CIFS_I(d_inode(cfile->dentry));
255         struct cifs_fid_locks *fdlocks;
256 
257         xid = get_xid();
258 
259         /*
260          * Accessing maxBuf is racy with cifs_reconnect - need to store value
261          * and check it for zero before using.
262          */
263         max_buf = tlink_tcon(cfile->tlink)->ses->server->maxBuf;
264         if (max_buf < sizeof(struct smb2_lock_element)) {
265                 free_xid(xid);
266                 return -EINVAL;
267         }
268 
269         max_num = max_buf / sizeof(struct smb2_lock_element);
270         buf = kcalloc(max_num, sizeof(struct smb2_lock_element), GFP_KERNEL);
271         if (!buf) {
272                 free_xid(xid);
273                 return -ENOMEM;
274         }
275 
276         list_for_each_entry(fdlocks, &cinode->llist, llist) {
277                 stored_rc = smb2_push_mand_fdlocks(fdlocks, xid, buf, max_num);
278                 if (stored_rc)
279                         rc = stored_rc;
280         }
281 
282         kfree(buf);
283         free_xid(xid);
284         return rc;
285 }
286 

~ [ source navigation ] ~ [ diff markup ] ~ [ identifier search ] ~

kernel.org | git.kernel.org | LWN.net | Project Home | Wiki (Japanese) | Wiki (English) | SVN repository | Mail admin

Linux® is a registered trademark of Linus Torvalds in the United States and other countries.
TOMOYO® is a registered trademark of NTT DATA CORPORATION.

osdn.jp