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Linux/fs/cifs/smb2file.c

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  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 
 47         smb2_path = cifs_convert_path_to_utf16(oparms->path, oparms->cifs_sb);
 48         if (smb2_path == NULL) {
 49                 rc = -ENOMEM;
 50                 goto out;
 51         }
 52 
 53         smb2_data = kzalloc(sizeof(struct smb2_file_all_info) + PATH_MAX * 2,
 54                             GFP_KERNEL);
 55         if (smb2_data == NULL) {
 56                 rc = -ENOMEM;
 57                 goto out;
 58         }
 59 
 60         oparms->desired_access |= FILE_READ_ATTRIBUTES;
 61         *smb2_oplock = SMB2_OPLOCK_LEVEL_BATCH;
 62 
 63         if (oparms->tcon->ses->server->capabilities & SMB2_GLOBAL_CAP_LEASING)
 64                 memcpy(smb2_oplock + 1, fid->lease_key, SMB2_LEASE_KEY_SIZE);
 65 
 66         rc = SMB2_open(xid, oparms, smb2_path, smb2_oplock, smb2_data, NULL);
 67         if (rc)
 68                 goto out;
 69 
 70         if (buf) {
 71                 /* open response does not have IndexNumber field - get it */
 72                 rc = SMB2_get_srv_num(xid, oparms->tcon, fid->persistent_fid,
 73                                       fid->volatile_fid,
 74                                       &smb2_data->IndexNumber);
 75                 if (rc) {
 76                         /* let get_inode_info disable server inode numbers */
 77                         smb2_data->IndexNumber = 0;
 78                         rc = 0;
 79                 }
 80                 move_smb2_info_to_cifs(buf, smb2_data);
 81         }
 82 
 83         *oplock = *smb2_oplock;
 84 out:
 85         kfree(smb2_data);
 86         kfree(smb2_path);
 87         return rc;
 88 }
 89 
 90 int
 91 smb2_unlock_range(struct cifsFileInfo *cfile, struct file_lock *flock,
 92                   const unsigned int xid)
 93 {
 94         int rc = 0, stored_rc;
 95         unsigned int max_num, num = 0, max_buf;
 96         struct smb2_lock_element *buf, *cur;
 97         struct cifs_tcon *tcon = tlink_tcon(cfile->tlink);
 98         struct cifsInodeInfo *cinode = CIFS_I(d_inode(cfile->dentry));
 99         struct cifsLockInfo *li, *tmp;
100         __u64 length = 1 + flock->fl_end - flock->fl_start;
101         struct list_head tmp_llist;
102 
103         INIT_LIST_HEAD(&tmp_llist);
104 
105         /*
106          * Accessing maxBuf is racy with cifs_reconnect - need to store value
107          * and check it for zero before using.
108          */
109         max_buf = tcon->ses->server->maxBuf;
110         if (!max_buf)
111                 return -EINVAL;
112 
113         max_num = max_buf / sizeof(struct smb2_lock_element);
114         buf = kcalloc(max_num, sizeof(struct smb2_lock_element), GFP_KERNEL);
115         if (!buf)
116                 return -ENOMEM;
117 
118         cur = buf;
119 
120         down_write(&cinode->lock_sem);
121         list_for_each_entry_safe(li, tmp, &cfile->llist->locks, llist) {
122                 if (flock->fl_start > li->offset ||
123                     (flock->fl_start + length) <
124                     (li->offset + li->length))
125                         continue;
126                 if (current->tgid != li->pid)
127                         continue;
128                 if (cinode->can_cache_brlcks) {
129                         /*
130                          * We can cache brlock requests - simply remove a lock
131                          * from the file's list.
132                          */
133                         list_del(&li->llist);
134                         cifs_del_lock_waiters(li);
135                         kfree(li);
136                         continue;
137                 }
138                 cur->Length = cpu_to_le64(li->length);
139                 cur->Offset = cpu_to_le64(li->offset);
140                 cur->Flags = cpu_to_le32(SMB2_LOCKFLAG_UNLOCK);
141                 /*
142                  * We need to save a lock here to let us add it again to the
143                  * file's list if the unlock range request fails on the server.
144                  */
145                 list_move(&li->llist, &tmp_llist);
146                 if (++num == max_num) {
147                         stored_rc = smb2_lockv(xid, tcon,
148                                                cfile->fid.persistent_fid,
149                                                cfile->fid.volatile_fid,
150                                                current->tgid, num, buf);
151                         if (stored_rc) {
152                                 /*
153                                  * We failed on the unlock range request - add
154                                  * all locks from the tmp list to the head of
155                                  * the file's list.
156                                  */
157                                 cifs_move_llist(&tmp_llist,
158                                                 &cfile->llist->locks);
159                                 rc = stored_rc;
160                         } else
161                                 /*
162                                  * The unlock range request succeed - free the
163                                  * tmp list.
164                                  */
165                                 cifs_free_llist(&tmp_llist);
166                         cur = buf;
167                         num = 0;
168                 } else
169                         cur++;
170         }
171         if (num) {
172                 stored_rc = smb2_lockv(xid, tcon, cfile->fid.persistent_fid,
173                                        cfile->fid.volatile_fid, current->tgid,
174                                        num, buf);
175                 if (stored_rc) {
176                         cifs_move_llist(&tmp_llist, &cfile->llist->locks);
177                         rc = stored_rc;
178                 } else
179                         cifs_free_llist(&tmp_llist);
180         }
181         up_write(&cinode->lock_sem);
182 
183         kfree(buf);
184         return rc;
185 }
186 
187 static int
188 smb2_push_mand_fdlocks(struct cifs_fid_locks *fdlocks, const unsigned int xid,
189                        struct smb2_lock_element *buf, unsigned int max_num)
190 {
191         int rc = 0, stored_rc;
192         struct cifsFileInfo *cfile = fdlocks->cfile;
193         struct cifsLockInfo *li;
194         unsigned int num = 0;
195         struct smb2_lock_element *cur = buf;
196         struct cifs_tcon *tcon = tlink_tcon(cfile->tlink);
197 
198         list_for_each_entry(li, &fdlocks->locks, llist) {
199                 cur->Length = cpu_to_le64(li->length);
200                 cur->Offset = cpu_to_le64(li->offset);
201                 cur->Flags = cpu_to_le32(li->type |
202                                                 SMB2_LOCKFLAG_FAIL_IMMEDIATELY);
203                 if (++num == max_num) {
204                         stored_rc = smb2_lockv(xid, tcon,
205                                                cfile->fid.persistent_fid,
206                                                cfile->fid.volatile_fid,
207                                                current->tgid, num, buf);
208                         if (stored_rc)
209                                 rc = stored_rc;
210                         cur = buf;
211                         num = 0;
212                 } else
213                         cur++;
214         }
215         if (num) {
216                 stored_rc = smb2_lockv(xid, tcon,
217                                        cfile->fid.persistent_fid,
218                                        cfile->fid.volatile_fid,
219                                        current->tgid, num, buf);
220                 if (stored_rc)
221                         rc = stored_rc;
222         }
223 
224         return rc;
225 }
226 
227 int
228 smb2_push_mandatory_locks(struct cifsFileInfo *cfile)
229 {
230         int rc = 0, stored_rc;
231         unsigned int xid;
232         unsigned int max_num, max_buf;
233         struct smb2_lock_element *buf;
234         struct cifsInodeInfo *cinode = CIFS_I(d_inode(cfile->dentry));
235         struct cifs_fid_locks *fdlocks;
236 
237         xid = get_xid();
238 
239         /*
240          * Accessing maxBuf is racy with cifs_reconnect - need to store value
241          * and check it for zero before using.
242          */
243         max_buf = tlink_tcon(cfile->tlink)->ses->server->maxBuf;
244         if (max_buf < sizeof(struct smb2_lock_element)) {
245                 free_xid(xid);
246                 return -EINVAL;
247         }
248 
249         max_num = max_buf / sizeof(struct smb2_lock_element);
250         buf = kcalloc(max_num, sizeof(struct smb2_lock_element), GFP_KERNEL);
251         if (!buf) {
252                 free_xid(xid);
253                 return -ENOMEM;
254         }
255 
256         list_for_each_entry(fdlocks, &cinode->llist, llist) {
257                 stored_rc = smb2_push_mand_fdlocks(fdlocks, xid, buf, max_num);
258                 if (stored_rc)
259                         rc = stored_rc;
260         }
261 
262         kfree(buf);
263         free_xid(xid);
264         return rc;
265 }
266 

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