blob: 12bb656fbe75881354bdfe1550b453b90f3fa4a3 [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
2 * fs/cifs/file.c
3 *
4 * vfs operations that deal with files
Steve Frenchfb8c4b12007-07-10 01:16:18 +00005 *
6 * Copyright (C) International Business Machines Corp., 2002,2007
Linus Torvalds1da177e2005-04-16 15:20:36 -07007 * Author(s): Steve French (sfrench@us.ibm.com)
Jeremy Allison7ee1af72006-08-02 21:56:33 +00008 * Jeremy Allison (jra@samba.org)
Linus Torvalds1da177e2005-04-16 15:20:36 -07009 *
10 * This library is free software; you can redistribute it and/or modify
11 * it under the terms of the GNU Lesser General Public License as published
12 * by the Free Software Foundation; either version 2.1 of the License, or
13 * (at your option) any later version.
14 *
15 * This library is distributed in the hope that it will be useful,
16 * but WITHOUT ANY WARRANTY; without even the implied warranty of
17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See
18 * the GNU Lesser General Public License for more details.
19 *
20 * You should have received a copy of the GNU Lesser General Public License
21 * along with this library; if not, write to the Free Software
22 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
23 */
24#include <linux/fs.h>
Steve French37c0eb42005-10-05 14:50:29 -070025#include <linux/backing-dev.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070026#include <linux/stat.h>
27#include <linux/fcntl.h>
28#include <linux/pagemap.h>
29#include <linux/pagevec.h>
Steve French37c0eb42005-10-05 14:50:29 -070030#include <linux/writeback.h>
Andrew Morton6f88cc22006-12-10 02:19:44 -080031#include <linux/task_io_accounting_ops.h>
Steve French23e7dd72005-10-20 13:44:56 -070032#include <linux/delay.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070033#include <asm/div64.h>
34#include "cifsfs.h"
35#include "cifspdu.h"
36#include "cifsglob.h"
37#include "cifsproto.h"
38#include "cifs_unicode.h"
39#include "cifs_debug.h"
40#include "cifs_fs_sb.h"
41
42static inline struct cifsFileInfo *cifs_init_private(
43 struct cifsFileInfo *private_data, struct inode *inode,
44 struct file *file, __u16 netfid)
45{
46 memset(private_data, 0, sizeof(struct cifsFileInfo));
47 private_data->netfid = netfid;
Steve Frenchfb8c4b12007-07-10 01:16:18 +000048 private_data->pid = current->tgid;
Linus Torvalds1da177e2005-04-16 15:20:36 -070049 init_MUTEX(&private_data->fh_sem);
Roland Dreier796e5662007-05-03 04:33:45 +000050 mutex_init(&private_data->lock_mutex);
Jeremy Allison7ee1af72006-08-02 21:56:33 +000051 INIT_LIST_HEAD(&private_data->llist);
Linus Torvalds1da177e2005-04-16 15:20:36 -070052 private_data->pfile = file; /* needed for writepage */
53 private_data->pInode = inode;
Steve French4b18f2a2008-04-29 00:06:05 +000054 private_data->invalidHandle = false;
55 private_data->closePend = false;
Steve French23e7dd72005-10-20 13:44:56 -070056 /* we have to track num writers to the inode, since writepages
57 does not tell us which handle the write is for so there can
58 be a close (overlapping with write) of the filehandle that
59 cifs_writepages chose to use */
Steve Frenchfb8c4b12007-07-10 01:16:18 +000060 atomic_set(&private_data->wrtPending, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -070061
62 return private_data;
63}
64
65static inline int cifs_convert_flags(unsigned int flags)
66{
67 if ((flags & O_ACCMODE) == O_RDONLY)
68 return GENERIC_READ;
69 else if ((flags & O_ACCMODE) == O_WRONLY)
70 return GENERIC_WRITE;
71 else if ((flags & O_ACCMODE) == O_RDWR) {
72 /* GENERIC_ALL is too much permission to request
73 can cause unnecessary access denied on create */
74 /* return GENERIC_ALL; */
75 return (GENERIC_READ | GENERIC_WRITE);
76 }
77
Jeff Laytone10f7b52008-05-14 10:21:33 -070078 return (READ_CONTROL | FILE_WRITE_ATTRIBUTES | FILE_READ_ATTRIBUTES |
79 FILE_WRITE_EA | FILE_APPEND_DATA | FILE_WRITE_DATA |
80 FILE_READ_DATA);
81
82
Linus Torvalds1da177e2005-04-16 15:20:36 -070083}
84
85static inline int cifs_get_disposition(unsigned int flags)
86{
87 if ((flags & (O_CREAT | O_EXCL)) == (O_CREAT | O_EXCL))
88 return FILE_CREATE;
89 else if ((flags & (O_CREAT | O_TRUNC)) == (O_CREAT | O_TRUNC))
90 return FILE_OVERWRITE_IF;
91 else if ((flags & O_CREAT) == O_CREAT)
92 return FILE_OPEN_IF;
Steve French55aa2e02006-05-30 18:09:31 +000093 else if ((flags & O_TRUNC) == O_TRUNC)
94 return FILE_OVERWRITE;
Linus Torvalds1da177e2005-04-16 15:20:36 -070095 else
96 return FILE_OPEN;
97}
98
99/* all arguments to this function must be checked for validity in caller */
100static inline int cifs_open_inode_helper(struct inode *inode, struct file *file,
101 struct cifsInodeInfo *pCifsInode, struct cifsFileInfo *pCifsFile,
102 struct cifsTconInfo *pTcon, int *oplock, FILE_ALL_INFO *buf,
103 char *full_path, int xid)
104{
105 struct timespec temp;
106 int rc;
107
108 /* want handles we can use to read with first
109 in the list so we do not have to walk the
Nick Piggind9414772008-09-24 11:32:59 -0400110 list to search for one in write_begin */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700111 if ((file->f_flags & O_ACCMODE) == O_WRONLY) {
Steve Frenchfb8c4b12007-07-10 01:16:18 +0000112 list_add_tail(&pCifsFile->flist,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700113 &pCifsInode->openFileList);
114 } else {
115 list_add(&pCifsFile->flist,
116 &pCifsInode->openFileList);
117 }
118 write_unlock(&GlobalSMBSeslock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700119 if (pCifsInode->clientCanCacheRead) {
120 /* we have the inode open somewhere else
121 no need to discard cache data */
122 goto client_can_cache;
123 }
124
125 /* BB need same check in cifs_create too? */
126 /* if not oplocked, invalidate inode pages if mtime or file
127 size changed */
128 temp = cifs_NTtimeToUnix(le64_to_cpu(buf->LastWriteTime));
Josef "Jeff" Sipeke6a00292006-12-08 02:36:48 -0800129 if (timespec_equal(&file->f_path.dentry->d_inode->i_mtime, &temp) &&
130 (file->f_path.dentry->d_inode->i_size ==
Linus Torvalds1da177e2005-04-16 15:20:36 -0700131 (loff_t)le64_to_cpu(buf->EndOfFile))) {
132 cFYI(1, ("inode unchanged on server"));
133 } else {
Josef "Jeff" Sipeke6a00292006-12-08 02:36:48 -0800134 if (file->f_path.dentry->d_inode->i_mapping) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700135 /* BB no need to lock inode until after invalidate
136 since namei code should already have it locked? */
Jeff Laytoncea21802007-11-20 23:19:03 +0000137 rc = filemap_write_and_wait(file->f_path.dentry->d_inode->i_mapping);
138 if (rc != 0)
139 CIFS_I(file->f_path.dentry->d_inode)->write_behind_rc = rc;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700140 }
141 cFYI(1, ("invalidating remote inode since open detected it "
142 "changed"));
Josef "Jeff" Sipeke6a00292006-12-08 02:36:48 -0800143 invalidate_remote_inode(file->f_path.dentry->d_inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700144 }
145
146client_can_cache:
Steve Frenchc18c8422007-07-18 23:21:09 +0000147 if (pTcon->unix_ext)
Josef "Jeff" Sipeke6a00292006-12-08 02:36:48 -0800148 rc = cifs_get_inode_info_unix(&file->f_path.dentry->d_inode,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700149 full_path, inode->i_sb, xid);
150 else
Josef "Jeff" Sipeke6a00292006-12-08 02:36:48 -0800151 rc = cifs_get_inode_info(&file->f_path.dentry->d_inode,
Steve French8b1327f2008-03-14 22:37:16 +0000152 full_path, buf, inode->i_sb, xid, NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700153
154 if ((*oplock & 0xF) == OPLOCK_EXCLUSIVE) {
Steve French4b18f2a2008-04-29 00:06:05 +0000155 pCifsInode->clientCanCacheAll = true;
156 pCifsInode->clientCanCacheRead = true;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700157 cFYI(1, ("Exclusive Oplock granted on inode %p",
Josef "Jeff" Sipeke6a00292006-12-08 02:36:48 -0800158 file->f_path.dentry->d_inode));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700159 } else if ((*oplock & 0xF) == OPLOCK_READ)
Steve French4b18f2a2008-04-29 00:06:05 +0000160 pCifsInode->clientCanCacheRead = true;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700161
162 return rc;
163}
164
165int cifs_open(struct inode *inode, struct file *file)
166{
167 int rc = -EACCES;
168 int xid, oplock;
169 struct cifs_sb_info *cifs_sb;
170 struct cifsTconInfo *pTcon;
171 struct cifsFileInfo *pCifsFile;
172 struct cifsInodeInfo *pCifsInode;
173 struct list_head *tmp;
174 char *full_path = NULL;
175 int desiredAccess;
176 int disposition;
177 __u16 netfid;
178 FILE_ALL_INFO *buf = NULL;
179
180 xid = GetXid();
181
182 cifs_sb = CIFS_SB(inode->i_sb);
183 pTcon = cifs_sb->tcon;
184
185 if (file->f_flags & O_CREAT) {
186 /* search inode for this file and fill in file->private_data */
Josef "Jeff" Sipeke6a00292006-12-08 02:36:48 -0800187 pCifsInode = CIFS_I(file->f_path.dentry->d_inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700188 read_lock(&GlobalSMBSeslock);
189 list_for_each(tmp, &pCifsInode->openFileList) {
190 pCifsFile = list_entry(tmp, struct cifsFileInfo,
191 flist);
192 if ((pCifsFile->pfile == NULL) &&
193 (pCifsFile->pid == current->tgid)) {
194 /* mode set in cifs_create */
195
196 /* needed for writepage */
197 pCifsFile->pfile = file;
Steve French50c2f752007-07-13 00:33:32 +0000198
Linus Torvalds1da177e2005-04-16 15:20:36 -0700199 file->private_data = pCifsFile;
200 break;
201 }
202 }
203 read_unlock(&GlobalSMBSeslock);
204 if (file->private_data != NULL) {
205 rc = 0;
206 FreeXid(xid);
207 return rc;
208 } else {
209 if (file->f_flags & O_EXCL)
210 cERROR(1, ("could not find file instance for "
Steve French26a21b92006-05-31 18:05:34 +0000211 "new file %p", file));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700212 }
213 }
214
Josef "Jeff" Sipeke6a00292006-12-08 02:36:48 -0800215 full_path = build_path_from_dentry(file->f_path.dentry);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700216 if (full_path == NULL) {
217 FreeXid(xid);
218 return -ENOMEM;
219 }
220
Steve French7521a3c2007-07-11 18:30:34 +0000221 cFYI(1, ("inode = 0x%p file flags are 0x%x for %s",
Linus Torvalds1da177e2005-04-16 15:20:36 -0700222 inode, file->f_flags, full_path));
223 desiredAccess = cifs_convert_flags(file->f_flags);
224
225/*********************************************************************
226 * open flag mapping table:
Steve Frenchfb8c4b12007-07-10 01:16:18 +0000227 *
Linus Torvalds1da177e2005-04-16 15:20:36 -0700228 * POSIX Flag CIFS Disposition
Steve Frenchfb8c4b12007-07-10 01:16:18 +0000229 * ---------- ----------------
Linus Torvalds1da177e2005-04-16 15:20:36 -0700230 * O_CREAT FILE_OPEN_IF
231 * O_CREAT | O_EXCL FILE_CREATE
232 * O_CREAT | O_TRUNC FILE_OVERWRITE_IF
233 * O_TRUNC FILE_OVERWRITE
234 * none of the above FILE_OPEN
235 *
236 * Note that there is not a direct match between disposition
Steve Frenchfb8c4b12007-07-10 01:16:18 +0000237 * FILE_SUPERSEDE (ie create whether or not file exists although
Linus Torvalds1da177e2005-04-16 15:20:36 -0700238 * O_CREAT | O_TRUNC is similar but truncates the existing
239 * file rather than creating a new file as FILE_SUPERSEDE does
240 * (which uses the attributes / metadata passed in on open call)
241 *?
Steve Frenchfb8c4b12007-07-10 01:16:18 +0000242 *? O_SYNC is a reasonable match to CIFS writethrough flag
Linus Torvalds1da177e2005-04-16 15:20:36 -0700243 *? and the read write flags match reasonably. O_LARGEFILE
244 *? is irrelevant because largefile support is always used
245 *? by this client. Flags O_APPEND, O_DIRECT, O_DIRECTORY,
246 * O_FASYNC, O_NOFOLLOW, O_NONBLOCK need further investigation
247 *********************************************************************/
248
249 disposition = cifs_get_disposition(file->f_flags);
250
251 if (oplockEnabled)
252 oplock = REQ_OPLOCK;
253 else
Steve French4b18f2a2008-04-29 00:06:05 +0000254 oplock = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700255
256 /* BB pass O_SYNC flag through on file attributes .. BB */
257
258 /* Also refresh inode by passing in file_info buf returned by SMBOpen
259 and calling get_inode_info with returned buf (at least helps
260 non-Unix server case) */
261
Steve Frenchfb8c4b12007-07-10 01:16:18 +0000262 /* BB we can not do this if this is the second open of a file
263 and the first handle has writebehind data, we might be
Linus Torvalds1da177e2005-04-16 15:20:36 -0700264 able to simply do a filemap_fdatawrite/filemap_fdatawait first */
265 buf = kmalloc(sizeof(FILE_ALL_INFO), GFP_KERNEL);
266 if (!buf) {
267 rc = -ENOMEM;
268 goto out;
269 }
Steve French5bafd762006-06-07 00:18:43 +0000270
271 if (cifs_sb->tcon->ses->capabilities & CAP_NT_SMBS)
Steve Frenchfb8c4b12007-07-10 01:16:18 +0000272 rc = CIFSSMBOpen(xid, pTcon, full_path, disposition,
Steve French5bafd762006-06-07 00:18:43 +0000273 desiredAccess, CREATE_NOT_DIR, &netfid, &oplock, buf,
Steve French737b7582005-04-28 22:41:06 -0700274 cifs_sb->local_nls, cifs_sb->mnt_cifs_flags
275 & CIFS_MOUNT_MAP_SPECIAL_CHR);
Steve French5bafd762006-06-07 00:18:43 +0000276 else
277 rc = -EIO; /* no NT SMB support fall into legacy open below */
278
Steve Frencha9d02ad2005-08-24 23:06:05 -0700279 if (rc == -EIO) {
280 /* Old server, try legacy style OpenX */
281 rc = SMBLegacyOpen(xid, pTcon, full_path, disposition,
282 desiredAccess, CREATE_NOT_DIR, &netfid, &oplock, buf,
283 cifs_sb->local_nls, cifs_sb->mnt_cifs_flags
284 & CIFS_MOUNT_MAP_SPECIAL_CHR);
285 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700286 if (rc) {
Steve French26a21b92006-05-31 18:05:34 +0000287 cFYI(1, ("cifs_open returned 0x%x", rc));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700288 goto out;
289 }
290 file->private_data =
291 kmalloc(sizeof(struct cifsFileInfo), GFP_KERNEL);
292 if (file->private_data == NULL) {
293 rc = -ENOMEM;
294 goto out;
295 }
296 pCifsFile = cifs_init_private(file->private_data, inode, file, netfid);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700297 write_lock(&GlobalSMBSeslock);
298 list_add(&pCifsFile->tlist, &pTcon->openFileList);
299
Josef "Jeff" Sipeke6a00292006-12-08 02:36:48 -0800300 pCifsInode = CIFS_I(file->f_path.dentry->d_inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700301 if (pCifsInode) {
302 rc = cifs_open_inode_helper(inode, file, pCifsInode,
303 pCifsFile, pTcon,
304 &oplock, buf, full_path, xid);
305 } else {
306 write_unlock(&GlobalSMBSeslock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700307 }
308
Steve Frenchfb8c4b12007-07-10 01:16:18 +0000309 if (oplock & CIFS_CREATE_ACTION) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700310 /* time to set mode which we can not set earlier due to
311 problems creating new read-only files */
Steve Frenchc18c8422007-07-18 23:21:09 +0000312 if (pTcon->unix_ext) {
Jeff Layton4e1e7fb2008-08-02 07:26:12 -0400313 struct cifs_unix_set_info_args args = {
314 .mode = inode->i_mode,
315 .uid = NO_CHANGE_64,
316 .gid = NO_CHANGE_64,
317 .ctime = NO_CHANGE_64,
318 .atime = NO_CHANGE_64,
319 .mtime = NO_CHANGE_64,
320 .device = 0,
321 };
322 CIFSSMBUnixSetInfo(xid, pTcon, full_path, &args,
Steve French737b7582005-04-28 22:41:06 -0700323 cifs_sb->local_nls,
Steve Frenchfb8c4b12007-07-10 01:16:18 +0000324 cifs_sb->mnt_cifs_flags &
Steve French737b7582005-04-28 22:41:06 -0700325 CIFS_MOUNT_MAP_SPECIAL_CHR);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700326 }
327 }
328
329out:
330 kfree(buf);
331 kfree(full_path);
332 FreeXid(xid);
333 return rc;
334}
335
Adrian Bunk04187262006-06-30 18:23:04 +0200336/* Try to reacquire byte range locks that were released when session */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700337/* to server was lost */
338static int cifs_relock_file(struct cifsFileInfo *cifsFile)
339{
340 int rc = 0;
341
342/* BB list all locks open on this file and relock */
343
344 return rc;
345}
346
Steve French4b18f2a2008-04-29 00:06:05 +0000347static int cifs_reopen_file(struct file *file, bool can_flush)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700348{
349 int rc = -EACCES;
350 int xid, oplock;
351 struct cifs_sb_info *cifs_sb;
352 struct cifsTconInfo *pTcon;
353 struct cifsFileInfo *pCifsFile;
354 struct cifsInodeInfo *pCifsInode;
Steve Frenchfb8c4b12007-07-10 01:16:18 +0000355 struct inode *inode;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700356 char *full_path = NULL;
357 int desiredAccess;
358 int disposition = FILE_OPEN;
359 __u16 netfid;
360
Steve Frenchad7a2922008-02-07 23:25:02 +0000361 if (file->private_data)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700362 pCifsFile = (struct cifsFileInfo *)file->private_data;
Steve Frenchad7a2922008-02-07 23:25:02 +0000363 else
Linus Torvalds1da177e2005-04-16 15:20:36 -0700364 return -EBADF;
365
366 xid = GetXid();
367 down(&pCifsFile->fh_sem);
Steve French4b18f2a2008-04-29 00:06:05 +0000368 if (!pCifsFile->invalidHandle) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700369 up(&pCifsFile->fh_sem);
370 FreeXid(xid);
371 return 0;
372 }
373
Josef "Jeff" Sipeke6a00292006-12-08 02:36:48 -0800374 if (file->f_path.dentry == NULL) {
Steve French3a9f4622007-04-04 17:10:24 +0000375 cERROR(1, ("no valid name if dentry freed"));
376 dump_stack();
377 rc = -EBADF;
378 goto reopen_error_exit;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700379 }
Steve French3a9f4622007-04-04 17:10:24 +0000380
381 inode = file->f_path.dentry->d_inode;
Steve Frenchfb8c4b12007-07-10 01:16:18 +0000382 if (inode == NULL) {
Steve French3a9f4622007-04-04 17:10:24 +0000383 cERROR(1, ("inode not valid"));
384 dump_stack();
385 rc = -EBADF;
386 goto reopen_error_exit;
387 }
Steve French50c2f752007-07-13 00:33:32 +0000388
Linus Torvalds1da177e2005-04-16 15:20:36 -0700389 cifs_sb = CIFS_SB(inode->i_sb);
390 pTcon = cifs_sb->tcon;
Steve French3a9f4622007-04-04 17:10:24 +0000391
Linus Torvalds1da177e2005-04-16 15:20:36 -0700392/* can not grab rename sem here because various ops, including
393 those that already have the rename sem can end up causing writepage
394 to get called and if the server was down that means we end up here,
395 and we can never tell if the caller already has the rename_sem */
Josef "Jeff" Sipeke6a00292006-12-08 02:36:48 -0800396 full_path = build_path_from_dentry(file->f_path.dentry);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700397 if (full_path == NULL) {
Steve French3a9f4622007-04-04 17:10:24 +0000398 rc = -ENOMEM;
399reopen_error_exit:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700400 up(&pCifsFile->fh_sem);
401 FreeXid(xid);
Steve French3a9f4622007-04-04 17:10:24 +0000402 return rc;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700403 }
404
Steve French3a9f4622007-04-04 17:10:24 +0000405 cFYI(1, ("inode = 0x%p file flags 0x%x for %s",
Steve Frenchfb8c4b12007-07-10 01:16:18 +0000406 inode, file->f_flags, full_path));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700407 desiredAccess = cifs_convert_flags(file->f_flags);
408
409 if (oplockEnabled)
410 oplock = REQ_OPLOCK;
411 else
Steve French4b18f2a2008-04-29 00:06:05 +0000412 oplock = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700413
414 /* Can not refresh inode by passing in file_info buf to be returned
Steve Frenchfb8c4b12007-07-10 01:16:18 +0000415 by SMBOpen and then calling get_inode_info with returned buf
416 since file might have write behind data that needs to be flushed
Linus Torvalds1da177e2005-04-16 15:20:36 -0700417 and server version of file size can be stale. If we knew for sure
418 that inode was not dirty locally we could do this */
419
Linus Torvalds1da177e2005-04-16 15:20:36 -0700420 rc = CIFSSMBOpen(xid, pTcon, full_path, disposition, desiredAccess,
421 CREATE_NOT_DIR, &netfid, &oplock, NULL,
Steve Frenchfb8c4b12007-07-10 01:16:18 +0000422 cifs_sb->local_nls, cifs_sb->mnt_cifs_flags &
Steve French737b7582005-04-28 22:41:06 -0700423 CIFS_MOUNT_MAP_SPECIAL_CHR);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700424 if (rc) {
425 up(&pCifsFile->fh_sem);
Steve French26a21b92006-05-31 18:05:34 +0000426 cFYI(1, ("cifs_open returned 0x%x", rc));
427 cFYI(1, ("oplock: %d", oplock));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700428 } else {
429 pCifsFile->netfid = netfid;
Steve French4b18f2a2008-04-29 00:06:05 +0000430 pCifsFile->invalidHandle = false;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700431 up(&pCifsFile->fh_sem);
432 pCifsInode = CIFS_I(inode);
433 if (pCifsInode) {
434 if (can_flush) {
Jeff Laytoncea21802007-11-20 23:19:03 +0000435 rc = filemap_write_and_wait(inode->i_mapping);
436 if (rc != 0)
437 CIFS_I(inode)->write_behind_rc = rc;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700438 /* temporarily disable caching while we
439 go to server to get inode info */
Steve French4b18f2a2008-04-29 00:06:05 +0000440 pCifsInode->clientCanCacheAll = false;
441 pCifsInode->clientCanCacheRead = false;
Steve Frenchc18c8422007-07-18 23:21:09 +0000442 if (pTcon->unix_ext)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700443 rc = cifs_get_inode_info_unix(&inode,
444 full_path, inode->i_sb, xid);
445 else
446 rc = cifs_get_inode_info(&inode,
447 full_path, NULL, inode->i_sb,
Steve French8b1327f2008-03-14 22:37:16 +0000448 xid, NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700449 } /* else we are writing out data to server already
450 and could deadlock if we tried to flush data, and
451 since we do not know if we have data that would
452 invalidate the current end of file on the server
453 we can not go to the server to get the new inod
454 info */
455 if ((oplock & 0xF) == OPLOCK_EXCLUSIVE) {
Steve French4b18f2a2008-04-29 00:06:05 +0000456 pCifsInode->clientCanCacheAll = true;
457 pCifsInode->clientCanCacheRead = true;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700458 cFYI(1, ("Exclusive Oplock granted on inode %p",
Josef "Jeff" Sipeke6a00292006-12-08 02:36:48 -0800459 file->f_path.dentry->d_inode));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700460 } else if ((oplock & 0xF) == OPLOCK_READ) {
Steve French4b18f2a2008-04-29 00:06:05 +0000461 pCifsInode->clientCanCacheRead = true;
462 pCifsInode->clientCanCacheAll = false;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700463 } else {
Steve French4b18f2a2008-04-29 00:06:05 +0000464 pCifsInode->clientCanCacheRead = false;
465 pCifsInode->clientCanCacheAll = false;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700466 }
467 cifs_relock_file(pCifsFile);
468 }
469 }
470
471 kfree(full_path);
472 FreeXid(xid);
473 return rc;
474}
475
476int cifs_close(struct inode *inode, struct file *file)
477{
478 int rc = 0;
Steve French15745322007-09-07 22:23:48 +0000479 int xid, timeout;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700480 struct cifs_sb_info *cifs_sb;
481 struct cifsTconInfo *pTcon;
482 struct cifsFileInfo *pSMBFile =
483 (struct cifsFileInfo *)file->private_data;
484
485 xid = GetXid();
486
487 cifs_sb = CIFS_SB(inode->i_sb);
488 pTcon = cifs_sb->tcon;
489 if (pSMBFile) {
Jeremy Allison7ee1af72006-08-02 21:56:33 +0000490 struct cifsLockInfo *li, *tmp;
Steve Frenchddb4cbf2008-11-20 20:00:44 +0000491 write_lock(&GlobalSMBSeslock);
Steve French4b18f2a2008-04-29 00:06:05 +0000492 pSMBFile->closePend = true;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700493 if (pTcon) {
494 /* no sense reconnecting to close a file that is
495 already closed */
Steve French3b795212008-11-13 19:45:32 +0000496 if (!pTcon->need_reconnect) {
Steve Frenchddb4cbf2008-11-20 20:00:44 +0000497 write_unlock(&GlobalSMBSeslock);
Steve French15745322007-09-07 22:23:48 +0000498 timeout = 2;
Steve Frenchfb8c4b12007-07-10 01:16:18 +0000499 while ((atomic_read(&pSMBFile->wrtPending) != 0)
Steve French15745322007-09-07 22:23:48 +0000500 && (timeout <= 2048)) {
Steve French23e7dd72005-10-20 13:44:56 -0700501 /* Give write a better chance to get to
502 server ahead of the close. We do not
503 want to add a wait_q here as it would
504 increase the memory utilization as
505 the struct would be in each open file,
Steve Frenchfb8c4b12007-07-10 01:16:18 +0000506 but this should give enough time to
Steve French23e7dd72005-10-20 13:44:56 -0700507 clear the socket */
Steve French90c81e02008-02-12 20:32:36 +0000508 cFYI(DBG2,
509 ("close delay, write pending"));
Steve French23e7dd72005-10-20 13:44:56 -0700510 msleep(timeout);
511 timeout *= 4;
Steve French4891d532006-11-07 16:31:16 +0000512 }
Steve Frenchfb8c4b12007-07-10 01:16:18 +0000513 if (atomic_read(&pSMBFile->wrtPending))
Steve Frenchddb4cbf2008-11-20 20:00:44 +0000514 cERROR(1, ("close with pending write"));
515 if (!pTcon->need_reconnect &&
516 !pSMBFile->invalidHandle)
517 rc = CIFSSMBClose(xid, pTcon,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700518 pSMBFile->netfid);
Steve Frenchddb4cbf2008-11-20 20:00:44 +0000519 } else
520 write_unlock(&GlobalSMBSeslock);
521 } else
522 write_unlock(&GlobalSMBSeslock);
Jeremy Allison7ee1af72006-08-02 21:56:33 +0000523
524 /* Delete any outstanding lock records.
525 We'll lose them when the file is closed anyway. */
Roland Dreier796e5662007-05-03 04:33:45 +0000526 mutex_lock(&pSMBFile->lock_mutex);
Jeremy Allison7ee1af72006-08-02 21:56:33 +0000527 list_for_each_entry_safe(li, tmp, &pSMBFile->llist, llist) {
528 list_del(&li->llist);
529 kfree(li);
530 }
Roland Dreier796e5662007-05-03 04:33:45 +0000531 mutex_unlock(&pSMBFile->lock_mutex);
Jeremy Allison7ee1af72006-08-02 21:56:33 +0000532
Steve Frenchcbe04762005-04-28 22:41:05 -0700533 write_lock(&GlobalSMBSeslock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700534 list_del(&pSMBFile->flist);
535 list_del(&pSMBFile->tlist);
Steve Frenchcbe04762005-04-28 22:41:05 -0700536 write_unlock(&GlobalSMBSeslock);
Steve French15745322007-09-07 22:23:48 +0000537 timeout = 10;
538 /* We waited above to give the SMBWrite a chance to issue
539 on the wire (so we do not get SMBWrite returning EBADF
540 if writepages is racing with close. Note that writepages
541 does not specify a file handle, so it is possible for a file
542 to be opened twice, and the application close the "wrong"
543 file handle - in these cases we delay long enough to allow
544 the SMBWrite to get on the wire before the SMB Close.
545 We allow total wait here over 45 seconds, more than
546 oplock break time, and more than enough to allow any write
547 to complete on the server, or to time out on the client */
548 while ((atomic_read(&pSMBFile->wrtPending) != 0)
549 && (timeout <= 50000)) {
550 cERROR(1, ("writes pending, delay free of handle"));
551 msleep(timeout);
552 timeout *= 8;
553 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700554 kfree(file->private_data);
555 file->private_data = NULL;
556 } else
557 rc = -EBADF;
558
Steve French4efa53f2007-09-11 05:50:53 +0000559 read_lock(&GlobalSMBSeslock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700560 if (list_empty(&(CIFS_I(inode)->openFileList))) {
561 cFYI(1, ("closing last open instance for inode %p", inode));
562 /* if the file is not open we do not know if we can cache info
563 on this inode, much less write behind and read ahead */
Steve French4b18f2a2008-04-29 00:06:05 +0000564 CIFS_I(inode)->clientCanCacheRead = false;
565 CIFS_I(inode)->clientCanCacheAll = false;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700566 }
Steve French4efa53f2007-09-11 05:50:53 +0000567 read_unlock(&GlobalSMBSeslock);
Steve Frenchfb8c4b12007-07-10 01:16:18 +0000568 if ((rc == 0) && CIFS_I(inode)->write_behind_rc)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700569 rc = CIFS_I(inode)->write_behind_rc;
570 FreeXid(xid);
571 return rc;
572}
573
574int cifs_closedir(struct inode *inode, struct file *file)
575{
576 int rc = 0;
577 int xid;
578 struct cifsFileInfo *pCFileStruct =
579 (struct cifsFileInfo *)file->private_data;
580 char *ptmp;
581
Steve French26a21b92006-05-31 18:05:34 +0000582 cFYI(1, ("Closedir inode = 0x%p", inode));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700583
584 xid = GetXid();
585
586 if (pCFileStruct) {
587 struct cifsTconInfo *pTcon;
Steve Frenchfb8c4b12007-07-10 01:16:18 +0000588 struct cifs_sb_info *cifs_sb =
589 CIFS_SB(file->f_path.dentry->d_sb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700590
591 pTcon = cifs_sb->tcon;
592
593 cFYI(1, ("Freeing private data in close dir"));
Steve Frenchddb4cbf2008-11-20 20:00:44 +0000594 write_lock(&GlobalSMBSeslock);
Steve French4b18f2a2008-04-29 00:06:05 +0000595 if (!pCFileStruct->srch_inf.endOfSearch &&
596 !pCFileStruct->invalidHandle) {
597 pCFileStruct->invalidHandle = true;
Steve Frenchddb4cbf2008-11-20 20:00:44 +0000598 write_unlock(&GlobalSMBSeslock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700599 rc = CIFSFindClose(xid, pTcon, pCFileStruct->netfid);
600 cFYI(1, ("Closing uncompleted readdir with rc %d",
601 rc));
602 /* not much we can do if it fails anyway, ignore rc */
603 rc = 0;
Steve Frenchddb4cbf2008-11-20 20:00:44 +0000604 } else
605 write_unlock(&GlobalSMBSeslock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700606 ptmp = pCFileStruct->srch_inf.ntwrk_buf_start;
607 if (ptmp) {
Steve Frenchec637e32005-12-12 20:53:18 -0800608 cFYI(1, ("closedir free smb buf in srch struct"));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700609 pCFileStruct->srch_inf.ntwrk_buf_start = NULL;
Steve Frenchfb8c4b12007-07-10 01:16:18 +0000610 if (pCFileStruct->srch_inf.smallBuf)
Steve Frenchd47d7c12006-02-28 03:45:48 +0000611 cifs_small_buf_release(ptmp);
612 else
613 cifs_buf_release(ptmp);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700614 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700615 kfree(file->private_data);
616 file->private_data = NULL;
617 }
618 /* BB can we lock the filestruct while this is going on? */
619 FreeXid(xid);
620 return rc;
621}
622
Jeremy Allison7ee1af72006-08-02 21:56:33 +0000623static int store_file_lock(struct cifsFileInfo *fid, __u64 len,
624 __u64 offset, __u8 lockType)
625{
Steve Frenchfb8c4b12007-07-10 01:16:18 +0000626 struct cifsLockInfo *li =
627 kmalloc(sizeof(struct cifsLockInfo), GFP_KERNEL);
Jeremy Allison7ee1af72006-08-02 21:56:33 +0000628 if (li == NULL)
629 return -ENOMEM;
630 li->offset = offset;
631 li->length = len;
632 li->type = lockType;
Roland Dreier796e5662007-05-03 04:33:45 +0000633 mutex_lock(&fid->lock_mutex);
Jeremy Allison7ee1af72006-08-02 21:56:33 +0000634 list_add(&li->llist, &fid->llist);
Roland Dreier796e5662007-05-03 04:33:45 +0000635 mutex_unlock(&fid->lock_mutex);
Jeremy Allison7ee1af72006-08-02 21:56:33 +0000636 return 0;
637}
638
Linus Torvalds1da177e2005-04-16 15:20:36 -0700639int cifs_lock(struct file *file, int cmd, struct file_lock *pfLock)
640{
641 int rc, xid;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700642 __u32 numLock = 0;
643 __u32 numUnlock = 0;
644 __u64 length;
Steve French4b18f2a2008-04-29 00:06:05 +0000645 bool wait_flag = false;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700646 struct cifs_sb_info *cifs_sb;
Steve French13a6e422008-12-02 17:24:33 +0000647 struct cifsTconInfo *tcon;
Steve French08547b02006-02-28 22:39:25 +0000648 __u16 netfid;
649 __u8 lockType = LOCKING_ANDX_LARGE_FILES;
Steve French13a6e422008-12-02 17:24:33 +0000650 bool posix_locking = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700651
652 length = 1 + pfLock->fl_end - pfLock->fl_start;
653 rc = -EACCES;
654 xid = GetXid();
655
656 cFYI(1, ("Lock parm: 0x%x flockflags: "
657 "0x%x flocktype: 0x%x start: %lld end: %lld",
Steve Frenchfb8c4b12007-07-10 01:16:18 +0000658 cmd, pfLock->fl_flags, pfLock->fl_type, pfLock->fl_start,
659 pfLock->fl_end));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700660
661 if (pfLock->fl_flags & FL_POSIX)
Steve Frenchd47d7c12006-02-28 03:45:48 +0000662 cFYI(1, ("Posix"));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700663 if (pfLock->fl_flags & FL_FLOCK)
Steve Frenchd47d7c12006-02-28 03:45:48 +0000664 cFYI(1, ("Flock"));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700665 if (pfLock->fl_flags & FL_SLEEP) {
Steve Frenchd47d7c12006-02-28 03:45:48 +0000666 cFYI(1, ("Blocking lock"));
Steve French4b18f2a2008-04-29 00:06:05 +0000667 wait_flag = true;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700668 }
669 if (pfLock->fl_flags & FL_ACCESS)
670 cFYI(1, ("Process suspended by mandatory locking - "
Steve French26a21b92006-05-31 18:05:34 +0000671 "not implemented yet"));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700672 if (pfLock->fl_flags & FL_LEASE)
673 cFYI(1, ("Lease on file - not implemented yet"));
Steve Frenchfb8c4b12007-07-10 01:16:18 +0000674 if (pfLock->fl_flags &
Linus Torvalds1da177e2005-04-16 15:20:36 -0700675 (~(FL_POSIX | FL_FLOCK | FL_SLEEP | FL_ACCESS | FL_LEASE)))
676 cFYI(1, ("Unknown lock flags 0x%x", pfLock->fl_flags));
677
678 if (pfLock->fl_type == F_WRLCK) {
679 cFYI(1, ("F_WRLCK "));
680 numLock = 1;
681 } else if (pfLock->fl_type == F_UNLCK) {
Steve Frenchd47d7c12006-02-28 03:45:48 +0000682 cFYI(1, ("F_UNLCK"));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700683 numUnlock = 1;
Steve Frenchd47d7c12006-02-28 03:45:48 +0000684 /* Check if unlock includes more than
685 one lock range */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700686 } else if (pfLock->fl_type == F_RDLCK) {
Steve Frenchd47d7c12006-02-28 03:45:48 +0000687 cFYI(1, ("F_RDLCK"));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700688 lockType |= LOCKING_ANDX_SHARED_LOCK;
689 numLock = 1;
690 } else if (pfLock->fl_type == F_EXLCK) {
Steve Frenchd47d7c12006-02-28 03:45:48 +0000691 cFYI(1, ("F_EXLCK"));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700692 numLock = 1;
693 } else if (pfLock->fl_type == F_SHLCK) {
Steve Frenchd47d7c12006-02-28 03:45:48 +0000694 cFYI(1, ("F_SHLCK"));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700695 lockType |= LOCKING_ANDX_SHARED_LOCK;
696 numLock = 1;
697 } else
Steve Frenchd47d7c12006-02-28 03:45:48 +0000698 cFYI(1, ("Unknown type of lock"));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700699
Josef "Jeff" Sipeke6a00292006-12-08 02:36:48 -0800700 cifs_sb = CIFS_SB(file->f_path.dentry->d_sb);
Steve French13a6e422008-12-02 17:24:33 +0000701 tcon = cifs_sb->tcon;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700702
703 if (file->private_data == NULL) {
704 FreeXid(xid);
705 return -EBADF;
706 }
Steve French08547b02006-02-28 22:39:25 +0000707 netfid = ((struct cifsFileInfo *)file->private_data)->netfid;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700708
Steve French13a6e422008-12-02 17:24:33 +0000709 if ((tcon->ses->capabilities & CAP_UNIX) &&
710 (CIFS_UNIX_FCNTL_CAP & le64_to_cpu(tcon->fsUnixInfo.Capability)) &&
Steve Frenchacc18aa2008-12-02 18:53:55 +0000711 ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NOPOSIXBRL) == 0))
Steve French13a6e422008-12-02 17:24:33 +0000712 posix_locking = 1;
Steve French08547b02006-02-28 22:39:25 +0000713 /* BB add code here to normalize offset and length to
714 account for negative length which we can not accept over the
715 wire */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700716 if (IS_GETLK(cmd)) {
Steve Frenchfb8c4b12007-07-10 01:16:18 +0000717 if (posix_locking) {
Steve French08547b02006-02-28 22:39:25 +0000718 int posix_lock_type;
Steve Frenchfb8c4b12007-07-10 01:16:18 +0000719 if (lockType & LOCKING_ANDX_SHARED_LOCK)
Steve French08547b02006-02-28 22:39:25 +0000720 posix_lock_type = CIFS_RDLCK;
721 else
722 posix_lock_type = CIFS_WRLCK;
Steve French13a6e422008-12-02 17:24:33 +0000723 rc = CIFSSMBPosixLock(xid, tcon, netfid, 1 /* get */,
Steve Frenchfc94cdb2006-05-30 18:03:32 +0000724 length, pfLock,
Steve French08547b02006-02-28 22:39:25 +0000725 posix_lock_type, wait_flag);
726 FreeXid(xid);
727 return rc;
728 }
729
730 /* BB we could chain these into one lock request BB */
Steve French13a6e422008-12-02 17:24:33 +0000731 rc = CIFSSMBLock(xid, tcon, netfid, length, pfLock->fl_start,
Steve French08547b02006-02-28 22:39:25 +0000732 0, 1, lockType, 0 /* wait flag */ );
Linus Torvalds1da177e2005-04-16 15:20:36 -0700733 if (rc == 0) {
Steve French13a6e422008-12-02 17:24:33 +0000734 rc = CIFSSMBLock(xid, tcon, netfid, length,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700735 pfLock->fl_start, 1 /* numUnlock */ ,
736 0 /* numLock */ , lockType,
737 0 /* wait flag */ );
738 pfLock->fl_type = F_UNLCK;
739 if (rc != 0)
740 cERROR(1, ("Error unlocking previously locked "
Steve French08547b02006-02-28 22:39:25 +0000741 "range %d during test of lock", rc));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700742 rc = 0;
743
744 } else {
745 /* if rc == ERR_SHARING_VIOLATION ? */
746 rc = 0; /* do not change lock type to unlock
747 since range in use */
748 }
749
750 FreeXid(xid);
751 return rc;
752 }
Jeremy Allison7ee1af72006-08-02 21:56:33 +0000753
754 if (!numLock && !numUnlock) {
755 /* if no lock or unlock then nothing
756 to do since we do not know what it is */
757 FreeXid(xid);
758 return -EOPNOTSUPP;
759 }
760
761 if (posix_locking) {
Steve French08547b02006-02-28 22:39:25 +0000762 int posix_lock_type;
Steve Frenchfb8c4b12007-07-10 01:16:18 +0000763 if (lockType & LOCKING_ANDX_SHARED_LOCK)
Steve French08547b02006-02-28 22:39:25 +0000764 posix_lock_type = CIFS_RDLCK;
765 else
766 posix_lock_type = CIFS_WRLCK;
Steve French50c2f752007-07-13 00:33:32 +0000767
Steve Frenchfb8c4b12007-07-10 01:16:18 +0000768 if (numUnlock == 1)
Steve Frenchbeb84dc2006-03-03 23:36:34 +0000769 posix_lock_type = CIFS_UNLCK;
Jeremy Allison7ee1af72006-08-02 21:56:33 +0000770
Steve French13a6e422008-12-02 17:24:33 +0000771 rc = CIFSSMBPosixLock(xid, tcon, netfid, 0 /* set */,
Steve Frenchfc94cdb2006-05-30 18:03:32 +0000772 length, pfLock,
Steve French08547b02006-02-28 22:39:25 +0000773 posix_lock_type, wait_flag);
Jeremy Allison7ee1af72006-08-02 21:56:33 +0000774 } else {
Steve Frenchfb8c4b12007-07-10 01:16:18 +0000775 struct cifsFileInfo *fid =
776 (struct cifsFileInfo *)file->private_data;
Jeremy Allison7ee1af72006-08-02 21:56:33 +0000777
778 if (numLock) {
Steve French13a6e422008-12-02 17:24:33 +0000779 rc = CIFSSMBLock(xid, tcon, netfid, length,
Steve Frenchfb8c4b12007-07-10 01:16:18 +0000780 pfLock->fl_start,
Jeremy Allison7ee1af72006-08-02 21:56:33 +0000781 0, numLock, lockType, wait_flag);
782
783 if (rc == 0) {
784 /* For Windows locks we must store them. */
785 rc = store_file_lock(fid, length,
786 pfLock->fl_start, lockType);
787 }
788 } else if (numUnlock) {
789 /* For each stored lock that this unlock overlaps
790 completely, unlock it. */
791 int stored_rc = 0;
792 struct cifsLockInfo *li, *tmp;
793
Steve French6b70c952006-09-21 07:35:29 +0000794 rc = 0;
Roland Dreier796e5662007-05-03 04:33:45 +0000795 mutex_lock(&fid->lock_mutex);
Jeremy Allison7ee1af72006-08-02 21:56:33 +0000796 list_for_each_entry_safe(li, tmp, &fid->llist, llist) {
797 if (pfLock->fl_start <= li->offset &&
Steve Frenchc19eb712007-08-24 03:22:48 +0000798 (pfLock->fl_start + length) >=
Jeff Layton39db8102007-08-24 03:16:51 +0000799 (li->offset + li->length)) {
Steve French13a6e422008-12-02 17:24:33 +0000800 stored_rc = CIFSSMBLock(xid, tcon,
Steve Frenchfb8c4b12007-07-10 01:16:18 +0000801 netfid,
Jeremy Allison7ee1af72006-08-02 21:56:33 +0000802 li->length, li->offset,
Steve French4b18f2a2008-04-29 00:06:05 +0000803 1, 0, li->type, false);
Jeremy Allison7ee1af72006-08-02 21:56:33 +0000804 if (stored_rc)
805 rc = stored_rc;
806
807 list_del(&li->llist);
808 kfree(li);
809 }
810 }
Roland Dreier796e5662007-05-03 04:33:45 +0000811 mutex_unlock(&fid->lock_mutex);
Jeremy Allison7ee1af72006-08-02 21:56:33 +0000812 }
813 }
814
Steve Frenchd634cc12005-08-26 14:42:59 -0500815 if (pfLock->fl_flags & FL_POSIX)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700816 posix_lock_file_wait(file, pfLock);
817 FreeXid(xid);
818 return rc;
819}
820
821ssize_t cifs_user_write(struct file *file, const char __user *write_data,
822 size_t write_size, loff_t *poffset)
823{
824 int rc = 0;
825 unsigned int bytes_written = 0;
826 unsigned int total_written;
827 struct cifs_sb_info *cifs_sb;
828 struct cifsTconInfo *pTcon;
829 int xid, long_op;
830 struct cifsFileInfo *open_file;
831
Josef "Jeff" Sipeke6a00292006-12-08 02:36:48 -0800832 cifs_sb = CIFS_SB(file->f_path.dentry->d_sb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700833
834 pTcon = cifs_sb->tcon;
835
836 /* cFYI(1,
837 (" write %d bytes to offset %lld of %s", write_size,
Josef "Jeff" Sipeke6a00292006-12-08 02:36:48 -0800838 *poffset, file->f_path.dentry->d_name.name)); */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700839
840 if (file->private_data == NULL)
841 return -EBADF;
Christoph Hellwigc33f8d32007-04-02 18:47:20 +0000842 open_file = (struct cifsFileInfo *) file->private_data;
Steve French50c2f752007-07-13 00:33:32 +0000843
Jeff Layton838726c2008-08-28 07:54:59 -0400844 rc = generic_write_checks(file, poffset, &write_size, 0);
845 if (rc)
846 return rc;
847
Linus Torvalds1da177e2005-04-16 15:20:36 -0700848 xid = GetXid();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700849
Josef "Jeff" Sipeke6a00292006-12-08 02:36:48 -0800850 if (*poffset > file->f_path.dentry->d_inode->i_size)
Steve French133672e2007-11-13 22:41:37 +0000851 long_op = CIFS_VLONG_OP; /* writes past EOF take long time */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700852 else
Steve French133672e2007-11-13 22:41:37 +0000853 long_op = CIFS_LONG_OP;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700854
855 for (total_written = 0; write_size > total_written;
856 total_written += bytes_written) {
857 rc = -EAGAIN;
858 while (rc == -EAGAIN) {
859 if (file->private_data == NULL) {
860 /* file has been closed on us */
861 FreeXid(xid);
862 /* if we have gotten here we have written some data
863 and blocked, and the file has been freed on us while
864 we blocked so return what we managed to write */
865 return total_written;
Steve Frenchfb8c4b12007-07-10 01:16:18 +0000866 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700867 if (open_file->closePend) {
868 FreeXid(xid);
869 if (total_written)
870 return total_written;
871 else
872 return -EBADF;
873 }
874 if (open_file->invalidHandle) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700875 /* we could deadlock if we called
876 filemap_fdatawait from here so tell
877 reopen_file not to flush data to server
878 now */
Steve French4b18f2a2008-04-29 00:06:05 +0000879 rc = cifs_reopen_file(file, false);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700880 if (rc != 0)
881 break;
882 }
883
884 rc = CIFSSMBWrite(xid, pTcon,
885 open_file->netfid,
886 min_t(const int, cifs_sb->wsize,
887 write_size - total_written),
888 *poffset, &bytes_written,
889 NULL, write_data + total_written, long_op);
890 }
891 if (rc || (bytes_written == 0)) {
892 if (total_written)
893 break;
894 else {
895 FreeXid(xid);
896 return rc;
897 }
898 } else
899 *poffset += bytes_written;
Steve French133672e2007-11-13 22:41:37 +0000900 long_op = CIFS_STD_OP; /* subsequent writes fast -
Linus Torvalds1da177e2005-04-16 15:20:36 -0700901 15 seconds is plenty */
902 }
903
Steve Frencha4544342005-08-24 13:59:35 -0700904 cifs_stats_bytes_written(pTcon, total_written);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700905
906 /* since the write may have blocked check these pointers again */
Steve French3677db12007-02-26 16:46:11 +0000907 if ((file->f_path.dentry) && (file->f_path.dentry->d_inode)) {
908 struct inode *inode = file->f_path.dentry->d_inode;
Steve Frenchfb8c4b12007-07-10 01:16:18 +0000909/* Do not update local mtime - server will set its actual value on write
910 * inode->i_ctime = inode->i_mtime =
Steve French3677db12007-02-26 16:46:11 +0000911 * current_fs_time(inode->i_sb);*/
912 if (total_written > 0) {
913 spin_lock(&inode->i_lock);
914 if (*poffset > file->f_path.dentry->d_inode->i_size)
915 i_size_write(file->f_path.dentry->d_inode,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700916 *poffset);
Steve French3677db12007-02-26 16:46:11 +0000917 spin_unlock(&inode->i_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700918 }
Steve Frenchfb8c4b12007-07-10 01:16:18 +0000919 mark_inode_dirty_sync(file->f_path.dentry->d_inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700920 }
921 FreeXid(xid);
922 return total_written;
923}
924
925static ssize_t cifs_write(struct file *file, const char *write_data,
Nick Piggind9414772008-09-24 11:32:59 -0400926 size_t write_size, loff_t *poffset)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700927{
928 int rc = 0;
929 unsigned int bytes_written = 0;
930 unsigned int total_written;
931 struct cifs_sb_info *cifs_sb;
932 struct cifsTconInfo *pTcon;
933 int xid, long_op;
934 struct cifsFileInfo *open_file;
935
Josef "Jeff" Sipeke6a00292006-12-08 02:36:48 -0800936 cifs_sb = CIFS_SB(file->f_path.dentry->d_sb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700937
938 pTcon = cifs_sb->tcon;
939
Steve Frenchfb8c4b12007-07-10 01:16:18 +0000940 cFYI(1, ("write %zd bytes to offset %lld of %s", write_size,
Josef "Jeff" Sipeke6a00292006-12-08 02:36:48 -0800941 *poffset, file->f_path.dentry->d_name.name));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700942
943 if (file->private_data == NULL)
944 return -EBADF;
Christoph Hellwigc33f8d32007-04-02 18:47:20 +0000945 open_file = (struct cifsFileInfo *)file->private_data;
Steve French50c2f752007-07-13 00:33:32 +0000946
Linus Torvalds1da177e2005-04-16 15:20:36 -0700947 xid = GetXid();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700948
Josef "Jeff" Sipeke6a00292006-12-08 02:36:48 -0800949 if (*poffset > file->f_path.dentry->d_inode->i_size)
Steve French133672e2007-11-13 22:41:37 +0000950 long_op = CIFS_VLONG_OP; /* writes past EOF can be slow */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700951 else
Steve French133672e2007-11-13 22:41:37 +0000952 long_op = CIFS_LONG_OP;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700953
954 for (total_written = 0; write_size > total_written;
955 total_written += bytes_written) {
956 rc = -EAGAIN;
957 while (rc == -EAGAIN) {
958 if (file->private_data == NULL) {
959 /* file has been closed on us */
960 FreeXid(xid);
961 /* if we have gotten here we have written some data
962 and blocked, and the file has been freed on us
Steve Frenchfb8c4b12007-07-10 01:16:18 +0000963 while we blocked so return what we managed to
Linus Torvalds1da177e2005-04-16 15:20:36 -0700964 write */
965 return total_written;
Steve Frenchfb8c4b12007-07-10 01:16:18 +0000966 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700967 if (open_file->closePend) {
968 FreeXid(xid);
969 if (total_written)
970 return total_written;
971 else
972 return -EBADF;
973 }
974 if (open_file->invalidHandle) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700975 /* we could deadlock if we called
976 filemap_fdatawait from here so tell
Steve Frenchfb8c4b12007-07-10 01:16:18 +0000977 reopen_file not to flush data to
Linus Torvalds1da177e2005-04-16 15:20:36 -0700978 server now */
Steve French4b18f2a2008-04-29 00:06:05 +0000979 rc = cifs_reopen_file(file, false);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700980 if (rc != 0)
981 break;
982 }
Steve Frenchfb8c4b12007-07-10 01:16:18 +0000983 if (experimEnabled || (pTcon->ses->server &&
984 ((pTcon->ses->server->secMode &
Steve French08775832006-05-30 18:08:26 +0000985 (SECMODE_SIGN_REQUIRED | SECMODE_SIGN_ENABLED))
Steve Frenchc01f36a2006-05-30 18:05:10 +0000986 == 0))) {
Steve French3e844692005-10-03 13:37:24 -0700987 struct kvec iov[2];
988 unsigned int len;
989
Steve French0ae0efa2005-10-10 10:57:19 -0700990 len = min((size_t)cifs_sb->wsize,
Steve French3e844692005-10-03 13:37:24 -0700991 write_size - total_written);
992 /* iov[0] is reserved for smb header */
993 iov[1].iov_base = (char *)write_data +
994 total_written;
995 iov[1].iov_len = len;
Steve Frenchd6e04ae2005-06-13 13:24:43 -0500996 rc = CIFSSMBWrite2(xid, pTcon,
Steve French3e844692005-10-03 13:37:24 -0700997 open_file->netfid, len,
Steve Frenchd6e04ae2005-06-13 13:24:43 -0500998 *poffset, &bytes_written,
Steve French3e844692005-10-03 13:37:24 -0700999 iov, 1, long_op);
Steve Frenchd6e04ae2005-06-13 13:24:43 -05001000 } else
Steve French60808232006-04-22 15:53:05 +00001001 rc = CIFSSMBWrite(xid, pTcon,
1002 open_file->netfid,
1003 min_t(const int, cifs_sb->wsize,
1004 write_size - total_written),
1005 *poffset, &bytes_written,
1006 write_data + total_written,
1007 NULL, long_op);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001008 }
1009 if (rc || (bytes_written == 0)) {
1010 if (total_written)
1011 break;
1012 else {
1013 FreeXid(xid);
1014 return rc;
1015 }
1016 } else
1017 *poffset += bytes_written;
Steve French133672e2007-11-13 22:41:37 +00001018 long_op = CIFS_STD_OP; /* subsequent writes fast -
Linus Torvalds1da177e2005-04-16 15:20:36 -07001019 15 seconds is plenty */
1020 }
1021
Steve Frencha4544342005-08-24 13:59:35 -07001022 cifs_stats_bytes_written(pTcon, total_written);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001023
1024 /* since the write may have blocked check these pointers again */
Steve French3677db12007-02-26 16:46:11 +00001025 if ((file->f_path.dentry) && (file->f_path.dentry->d_inode)) {
Steve French004c46b2007-02-17 04:34:13 +00001026/*BB We could make this contingent on superblock ATIME flag too */
Steve French3677db12007-02-26 16:46:11 +00001027/* file->f_path.dentry->d_inode->i_ctime =
1028 file->f_path.dentry->d_inode->i_mtime = CURRENT_TIME;*/
1029 if (total_written > 0) {
1030 spin_lock(&file->f_path.dentry->d_inode->i_lock);
1031 if (*poffset > file->f_path.dentry->d_inode->i_size)
1032 i_size_write(file->f_path.dentry->d_inode,
1033 *poffset);
1034 spin_unlock(&file->f_path.dentry->d_inode->i_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001035 }
Steve French3677db12007-02-26 16:46:11 +00001036 mark_inode_dirty_sync(file->f_path.dentry->d_inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001037 }
1038 FreeXid(xid);
1039 return total_written;
1040}
1041
Steve French630f3f0c2007-10-25 21:17:17 +00001042#ifdef CONFIG_CIFS_EXPERIMENTAL
1043struct cifsFileInfo *find_readable_file(struct cifsInodeInfo *cifs_inode)
1044{
1045 struct cifsFileInfo *open_file = NULL;
1046
1047 read_lock(&GlobalSMBSeslock);
1048 /* we could simply get the first_list_entry since write-only entries
1049 are always at the end of the list but since the first entry might
1050 have a close pending, we go through the whole list */
1051 list_for_each_entry(open_file, &cifs_inode->openFileList, flist) {
1052 if (open_file->closePend)
1053 continue;
1054 if (open_file->pfile && ((open_file->pfile->f_flags & O_RDWR) ||
1055 (open_file->pfile->f_flags & O_RDONLY))) {
1056 if (!open_file->invalidHandle) {
1057 /* found a good file */
1058 /* lock it so it will not be closed on us */
1059 atomic_inc(&open_file->wrtPending);
1060 read_unlock(&GlobalSMBSeslock);
1061 return open_file;
1062 } /* else might as well continue, and look for
1063 another, or simply have the caller reopen it
1064 again rather than trying to fix this handle */
1065 } else /* write only file */
1066 break; /* write only files are last so must be done */
1067 }
1068 read_unlock(&GlobalSMBSeslock);
1069 return NULL;
1070}
1071#endif
1072
Steve Frenchdd99cd82005-10-05 19:32:49 -07001073struct cifsFileInfo *find_writable_file(struct cifsInodeInfo *cifs_inode)
Steve French6148a742005-10-05 12:23:19 -07001074{
1075 struct cifsFileInfo *open_file;
Jeff Layton2846d382008-09-22 21:33:33 -04001076 bool any_available = false;
Steve Frenchdd99cd82005-10-05 19:32:49 -07001077 int rc;
Steve French6148a742005-10-05 12:23:19 -07001078
Steve French60808232006-04-22 15:53:05 +00001079 /* Having a null inode here (because mapping->host was set to zero by
1080 the VFS or MM) should not happen but we had reports of on oops (due to
1081 it being zero) during stress testcases so we need to check for it */
1082
Steve Frenchfb8c4b12007-07-10 01:16:18 +00001083 if (cifs_inode == NULL) {
1084 cERROR(1, ("Null inode passed to cifs_writeable_file"));
Steve French60808232006-04-22 15:53:05 +00001085 dump_stack();
1086 return NULL;
1087 }
1088
Steve French6148a742005-10-05 12:23:19 -07001089 read_lock(&GlobalSMBSeslock);
Steve French9b22b0b2007-10-02 01:11:08 +00001090refind_writable:
Steve French6148a742005-10-05 12:23:19 -07001091 list_for_each_entry(open_file, &cifs_inode->openFileList, flist) {
Jeff Layton2846d382008-09-22 21:33:33 -04001092 if (open_file->closePend ||
1093 (!any_available && open_file->pid != current->tgid))
Steve French6148a742005-10-05 12:23:19 -07001094 continue;
Jeff Layton2846d382008-09-22 21:33:33 -04001095
Steve French6148a742005-10-05 12:23:19 -07001096 if (open_file->pfile &&
1097 ((open_file->pfile->f_flags & O_RDWR) ||
1098 (open_file->pfile->f_flags & O_WRONLY))) {
Steve French23e7dd72005-10-20 13:44:56 -07001099 atomic_inc(&open_file->wrtPending);
Steve French9b22b0b2007-10-02 01:11:08 +00001100
1101 if (!open_file->invalidHandle) {
1102 /* found a good writable file */
1103 read_unlock(&GlobalSMBSeslock);
1104 return open_file;
1105 }
Steve French8840dee2007-11-16 23:05:52 +00001106
Steve French6148a742005-10-05 12:23:19 -07001107 read_unlock(&GlobalSMBSeslock);
Steve French9b22b0b2007-10-02 01:11:08 +00001108 /* Had to unlock since following call can block */
Steve French4b18f2a2008-04-29 00:06:05 +00001109 rc = cifs_reopen_file(open_file->pfile, false);
Steve French8840dee2007-11-16 23:05:52 +00001110 if (!rc) {
Steve French9b22b0b2007-10-02 01:11:08 +00001111 if (!open_file->closePend)
1112 return open_file;
1113 else { /* start over in case this was deleted */
1114 /* since the list could be modified */
Steve French37c0eb42005-10-05 14:50:29 -07001115 read_lock(&GlobalSMBSeslock);
Steve French15745322007-09-07 22:23:48 +00001116 atomic_dec(&open_file->wrtPending);
Steve French9b22b0b2007-10-02 01:11:08 +00001117 goto refind_writable;
Steve French37c0eb42005-10-05 14:50:29 -07001118 }
1119 }
Steve French9b22b0b2007-10-02 01:11:08 +00001120
1121 /* if it fails, try another handle if possible -
1122 (we can not do this if closePending since
1123 loop could be modified - in which case we
1124 have to start at the beginning of the list
1125 again. Note that it would be bad
1126 to hold up writepages here (rather than
1127 in caller) with continuous retries */
1128 cFYI(1, ("wp failed on reopen file"));
1129 read_lock(&GlobalSMBSeslock);
1130 /* can not use this handle, no write
1131 pending on this one after all */
1132 atomic_dec(&open_file->wrtPending);
Steve French8840dee2007-11-16 23:05:52 +00001133
Steve French9b22b0b2007-10-02 01:11:08 +00001134 if (open_file->closePend) /* list could have changed */
1135 goto refind_writable;
1136 /* else we simply continue to the next entry. Thus
1137 we do not loop on reopen errors. If we
1138 can not reopen the file, for example if we
1139 reconnected to a server with another client
1140 racing to delete or lock the file we would not
1141 make progress if we restarted before the beginning
1142 of the loop here. */
Steve French6148a742005-10-05 12:23:19 -07001143 }
1144 }
Jeff Layton2846d382008-09-22 21:33:33 -04001145 /* couldn't find useable FH with same pid, try any available */
1146 if (!any_available) {
1147 any_available = true;
1148 goto refind_writable;
1149 }
Steve French6148a742005-10-05 12:23:19 -07001150 read_unlock(&GlobalSMBSeslock);
1151 return NULL;
1152}
1153
Linus Torvalds1da177e2005-04-16 15:20:36 -07001154static int cifs_partialpagewrite(struct page *page, unsigned from, unsigned to)
1155{
1156 struct address_space *mapping = page->mapping;
1157 loff_t offset = (loff_t)page->index << PAGE_CACHE_SHIFT;
1158 char *write_data;
1159 int rc = -EFAULT;
1160 int bytes_written = 0;
1161 struct cifs_sb_info *cifs_sb;
1162 struct cifsTconInfo *pTcon;
1163 struct inode *inode;
Steve French6148a742005-10-05 12:23:19 -07001164 struct cifsFileInfo *open_file;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001165
1166 if (!mapping || !mapping->host)
1167 return -EFAULT;
1168
1169 inode = page->mapping->host;
1170 cifs_sb = CIFS_SB(inode->i_sb);
1171 pTcon = cifs_sb->tcon;
1172
1173 offset += (loff_t)from;
1174 write_data = kmap(page);
1175 write_data += from;
1176
1177 if ((to > PAGE_CACHE_SIZE) || (from > to)) {
1178 kunmap(page);
1179 return -EIO;
1180 }
1181
1182 /* racing with truncate? */
1183 if (offset > mapping->host->i_size) {
1184 kunmap(page);
1185 return 0; /* don't care */
1186 }
1187
1188 /* check to make sure that we are not extending the file */
1189 if (mapping->host->i_size - offset < (loff_t)to)
Steve Frenchfb8c4b12007-07-10 01:16:18 +00001190 to = (unsigned)(mapping->host->i_size - offset);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001191
Steve French6148a742005-10-05 12:23:19 -07001192 open_file = find_writable_file(CIFS_I(mapping->host));
1193 if (open_file) {
1194 bytes_written = cifs_write(open_file->pfile, write_data,
1195 to-from, &offset);
Steve French23e7dd72005-10-20 13:44:56 -07001196 atomic_dec(&open_file->wrtPending);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001197 /* Does mm or vfs already set times? */
Steve French6148a742005-10-05 12:23:19 -07001198 inode->i_atime = inode->i_mtime = current_fs_time(inode->i_sb);
Steve Frenchbb5a9a02007-12-31 04:21:29 +00001199 if ((bytes_written > 0) && (offset))
Steve French6148a742005-10-05 12:23:19 -07001200 rc = 0;
Steve Frenchbb5a9a02007-12-31 04:21:29 +00001201 else if (bytes_written < 0)
1202 rc = bytes_written;
Steve French6148a742005-10-05 12:23:19 -07001203 } else {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001204 cFYI(1, ("No writeable filehandles for inode"));
1205 rc = -EIO;
1206 }
1207
1208 kunmap(page);
1209 return rc;
1210}
1211
Linus Torvalds1da177e2005-04-16 15:20:36 -07001212static int cifs_writepages(struct address_space *mapping,
Steve French37c0eb42005-10-05 14:50:29 -07001213 struct writeback_control *wbc)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001214{
Steve French37c0eb42005-10-05 14:50:29 -07001215 struct backing_dev_info *bdi = mapping->backing_dev_info;
1216 unsigned int bytes_to_write;
1217 unsigned int bytes_written;
1218 struct cifs_sb_info *cifs_sb;
1219 int done = 0;
OGAWA Hirofumi111ebb62006-06-23 02:03:26 -07001220 pgoff_t end;
Steve French37c0eb42005-10-05 14:50:29 -07001221 pgoff_t index;
Steve Frenchfb8c4b12007-07-10 01:16:18 +00001222 int range_whole = 0;
1223 struct kvec *iov;
Steve French84d2f072005-10-12 15:32:05 -07001224 int len;
Steve French37c0eb42005-10-05 14:50:29 -07001225 int n_iov = 0;
1226 pgoff_t next;
1227 int nr_pages;
1228 __u64 offset = 0;
Steve French23e7dd72005-10-20 13:44:56 -07001229 struct cifsFileInfo *open_file;
Steve French37c0eb42005-10-05 14:50:29 -07001230 struct page *page;
1231 struct pagevec pvec;
1232 int rc = 0;
1233 int scanned = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001234 int xid;
1235
Steve French37c0eb42005-10-05 14:50:29 -07001236 cifs_sb = CIFS_SB(mapping->host->i_sb);
Steve French50c2f752007-07-13 00:33:32 +00001237
Steve French37c0eb42005-10-05 14:50:29 -07001238 /*
1239 * If wsize is smaller that the page cache size, default to writing
1240 * one page at a time via cifs_writepage
1241 */
1242 if (cifs_sb->wsize < PAGE_CACHE_SIZE)
1243 return generic_writepages(mapping, wbc);
1244
Steve Frenchfb8c4b12007-07-10 01:16:18 +00001245 if ((cifs_sb->tcon->ses) && (cifs_sb->tcon->ses->server))
1246 if (cifs_sb->tcon->ses->server->secMode &
1247 (SECMODE_SIGN_REQUIRED | SECMODE_SIGN_ENABLED))
1248 if (!experimEnabled)
Steve French60808232006-04-22 15:53:05 +00001249 return generic_writepages(mapping, wbc);
Steve French4a771182005-10-05 15:14:33 -07001250
Steve French9a0c8232007-02-02 04:21:57 +00001251 iov = kmalloc(32 * sizeof(struct kvec), GFP_KERNEL);
Steve Frenchfb8c4b12007-07-10 01:16:18 +00001252 if (iov == NULL)
Steve French9a0c8232007-02-02 04:21:57 +00001253 return generic_writepages(mapping, wbc);
1254
1255
Steve French37c0eb42005-10-05 14:50:29 -07001256 /*
1257 * BB: Is this meaningful for a non-block-device file system?
1258 * If it is, we should test it again after we do I/O
1259 */
1260 if (wbc->nonblocking && bdi_write_congested(bdi)) {
1261 wbc->encountered_congestion = 1;
Steve French9a0c8232007-02-02 04:21:57 +00001262 kfree(iov);
Steve French37c0eb42005-10-05 14:50:29 -07001263 return 0;
1264 }
1265
Linus Torvalds1da177e2005-04-16 15:20:36 -07001266 xid = GetXid();
1267
Steve French37c0eb42005-10-05 14:50:29 -07001268 pagevec_init(&pvec, 0);
OGAWA Hirofumi111ebb62006-06-23 02:03:26 -07001269 if (wbc->range_cyclic) {
Steve French37c0eb42005-10-05 14:50:29 -07001270 index = mapping->writeback_index; /* Start from prev offset */
OGAWA Hirofumi111ebb62006-06-23 02:03:26 -07001271 end = -1;
1272 } else {
1273 index = wbc->range_start >> PAGE_CACHE_SHIFT;
1274 end = wbc->range_end >> PAGE_CACHE_SHIFT;
1275 if (wbc->range_start == 0 && wbc->range_end == LLONG_MAX)
1276 range_whole = 1;
Steve French37c0eb42005-10-05 14:50:29 -07001277 scanned = 1;
1278 }
1279retry:
1280 while (!done && (index <= end) &&
1281 (nr_pages = pagevec_lookup_tag(&pvec, mapping, &index,
1282 PAGECACHE_TAG_DIRTY,
1283 min(end - index, (pgoff_t)PAGEVEC_SIZE - 1) + 1))) {
1284 int first;
1285 unsigned int i;
1286
Steve French37c0eb42005-10-05 14:50:29 -07001287 first = -1;
1288 next = 0;
1289 n_iov = 0;
1290 bytes_to_write = 0;
1291
1292 for (i = 0; i < nr_pages; i++) {
1293 page = pvec.pages[i];
1294 /*
1295 * At this point we hold neither mapping->tree_lock nor
1296 * lock on the page itself: the page may be truncated or
1297 * invalidated (changing page->mapping to NULL), or even
1298 * swizzled back from swapper_space to tmpfs file
1299 * mapping
1300 */
1301
1302 if (first < 0)
1303 lock_page(page);
Nick Piggin529ae9a2008-08-02 12:01:03 +02001304 else if (!trylock_page(page))
Steve French37c0eb42005-10-05 14:50:29 -07001305 break;
1306
1307 if (unlikely(page->mapping != mapping)) {
1308 unlock_page(page);
1309 break;
1310 }
1311
OGAWA Hirofumi111ebb62006-06-23 02:03:26 -07001312 if (!wbc->range_cyclic && page->index > end) {
Steve French37c0eb42005-10-05 14:50:29 -07001313 done = 1;
1314 unlock_page(page);
1315 break;
1316 }
1317
1318 if (next && (page->index != next)) {
1319 /* Not next consecutive page */
1320 unlock_page(page);
1321 break;
1322 }
1323
1324 if (wbc->sync_mode != WB_SYNC_NONE)
1325 wait_on_page_writeback(page);
1326
1327 if (PageWriteback(page) ||
Linus Torvaldscb876f42006-12-23 16:19:07 -08001328 !clear_page_dirty_for_io(page)) {
Steve French37c0eb42005-10-05 14:50:29 -07001329 unlock_page(page);
1330 break;
1331 }
Steve French84d2f072005-10-12 15:32:05 -07001332
Linus Torvaldscb876f42006-12-23 16:19:07 -08001333 /*
1334 * This actually clears the dirty bit in the radix tree.
1335 * See cifs_writepage() for more commentary.
1336 */
1337 set_page_writeback(page);
1338
Steve French84d2f072005-10-12 15:32:05 -07001339 if (page_offset(page) >= mapping->host->i_size) {
1340 done = 1;
1341 unlock_page(page);
Linus Torvaldscb876f42006-12-23 16:19:07 -08001342 end_page_writeback(page);
Steve French84d2f072005-10-12 15:32:05 -07001343 break;
1344 }
1345
Steve French37c0eb42005-10-05 14:50:29 -07001346 /*
1347 * BB can we get rid of this? pages are held by pvec
1348 */
1349 page_cache_get(page);
1350
Steve French84d2f072005-10-12 15:32:05 -07001351 len = min(mapping->host->i_size - page_offset(page),
1352 (loff_t)PAGE_CACHE_SIZE);
1353
Steve French37c0eb42005-10-05 14:50:29 -07001354 /* reserve iov[0] for the smb header */
1355 n_iov++;
1356 iov[n_iov].iov_base = kmap(page);
Steve French84d2f072005-10-12 15:32:05 -07001357 iov[n_iov].iov_len = len;
1358 bytes_to_write += len;
Steve French37c0eb42005-10-05 14:50:29 -07001359
1360 if (first < 0) {
1361 first = i;
1362 offset = page_offset(page);
1363 }
1364 next = page->index + 1;
1365 if (bytes_to_write + PAGE_CACHE_SIZE > cifs_sb->wsize)
1366 break;
1367 }
1368 if (n_iov) {
Steve French23e7dd72005-10-20 13:44:56 -07001369 /* Search for a writable handle every time we call
1370 * CIFSSMBWrite2. We can't rely on the last handle
1371 * we used to still be valid
1372 */
1373 open_file = find_writable_file(CIFS_I(mapping->host));
1374 if (!open_file) {
1375 cERROR(1, ("No writable handles for inode"));
1376 rc = -EBADF;
Steve French1047abc2005-10-11 19:58:06 -07001377 } else {
Steve French23e7dd72005-10-20 13:44:56 -07001378 rc = CIFSSMBWrite2(xid, cifs_sb->tcon,
1379 open_file->netfid,
1380 bytes_to_write, offset,
1381 &bytes_written, iov, n_iov,
Steve French133672e2007-11-13 22:41:37 +00001382 CIFS_LONG_OP);
Steve French23e7dd72005-10-20 13:44:56 -07001383 atomic_dec(&open_file->wrtPending);
1384 if (rc || bytes_written < bytes_to_write) {
Steve French63135e02007-07-17 17:34:02 +00001385 cERROR(1, ("Write2 ret %d, wrote %d",
Steve French23e7dd72005-10-20 13:44:56 -07001386 rc, bytes_written));
1387 /* BB what if continued retry is
1388 requested via mount flags? */
Jeff Laytoncea21802007-11-20 23:19:03 +00001389 if (rc == -ENOSPC)
1390 set_bit(AS_ENOSPC, &mapping->flags);
1391 else
1392 set_bit(AS_EIO, &mapping->flags);
Steve French23e7dd72005-10-20 13:44:56 -07001393 } else {
1394 cifs_stats_bytes_written(cifs_sb->tcon,
1395 bytes_written);
1396 }
Steve French37c0eb42005-10-05 14:50:29 -07001397 }
1398 for (i = 0; i < n_iov; i++) {
1399 page = pvec.pages[first + i];
Steve Frencheb9bdaa2006-01-27 15:11:47 -08001400 /* Should we also set page error on
1401 success rc but too little data written? */
1402 /* BB investigate retry logic on temporary
1403 server crash cases and how recovery works
Steve Frenchfb8c4b12007-07-10 01:16:18 +00001404 when page marked as error */
1405 if (rc)
Steve Frencheb9bdaa2006-01-27 15:11:47 -08001406 SetPageError(page);
Steve French37c0eb42005-10-05 14:50:29 -07001407 kunmap(page);
1408 unlock_page(page);
Linus Torvaldscb876f42006-12-23 16:19:07 -08001409 end_page_writeback(page);
Steve French37c0eb42005-10-05 14:50:29 -07001410 page_cache_release(page);
1411 }
1412 if ((wbc->nr_to_write -= n_iov) <= 0)
1413 done = 1;
1414 index = next;
Dave Kleikampb066a482008-11-18 03:49:05 +00001415 } else
1416 /* Need to re-find the pages we skipped */
1417 index = pvec.pages[0]->index + 1;
1418
Steve French37c0eb42005-10-05 14:50:29 -07001419 pagevec_release(&pvec);
1420 }
1421 if (!scanned && !done) {
1422 /*
1423 * We hit the last page and there is more work to be done: wrap
1424 * back to the start of the file
1425 */
1426 scanned = 1;
1427 index = 0;
1428 goto retry;
1429 }
OGAWA Hirofumi111ebb62006-06-23 02:03:26 -07001430 if (wbc->range_cyclic || (range_whole && wbc->nr_to_write > 0))
Steve French37c0eb42005-10-05 14:50:29 -07001431 mapping->writeback_index = index;
1432
Linus Torvalds1da177e2005-04-16 15:20:36 -07001433 FreeXid(xid);
Steve French9a0c8232007-02-02 04:21:57 +00001434 kfree(iov);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001435 return rc;
1436}
Linus Torvalds1da177e2005-04-16 15:20:36 -07001437
Steve Frenchfb8c4b12007-07-10 01:16:18 +00001438static int cifs_writepage(struct page *page, struct writeback_control *wbc)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001439{
1440 int rc = -EFAULT;
1441 int xid;
1442
1443 xid = GetXid();
1444/* BB add check for wbc flags */
1445 page_cache_get(page);
Steve Frenchad7a2922008-02-07 23:25:02 +00001446 if (!PageUptodate(page))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001447 cFYI(1, ("ppw - page not up to date"));
Linus Torvaldscb876f42006-12-23 16:19:07 -08001448
1449 /*
1450 * Set the "writeback" flag, and clear "dirty" in the radix tree.
1451 *
1452 * A writepage() implementation always needs to do either this,
1453 * or re-dirty the page with "redirty_page_for_writepage()" in
1454 * the case of a failure.
1455 *
1456 * Just unlocking the page will cause the radix tree tag-bits
1457 * to fail to update with the state of the page correctly.
1458 */
Steve Frenchfb8c4b12007-07-10 01:16:18 +00001459 set_page_writeback(page);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001460 rc = cifs_partialpagewrite(page, 0, PAGE_CACHE_SIZE);
1461 SetPageUptodate(page); /* BB add check for error and Clearuptodate? */
1462 unlock_page(page);
Linus Torvaldscb876f42006-12-23 16:19:07 -08001463 end_page_writeback(page);
1464 page_cache_release(page);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001465 FreeXid(xid);
1466 return rc;
1467}
1468
Nick Piggind9414772008-09-24 11:32:59 -04001469static int cifs_write_end(struct file *file, struct address_space *mapping,
1470 loff_t pos, unsigned len, unsigned copied,
1471 struct page *page, void *fsdata)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001472{
Nick Piggind9414772008-09-24 11:32:59 -04001473 int rc;
1474 struct inode *inode = mapping->host;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001475
Nick Piggind9414772008-09-24 11:32:59 -04001476 cFYI(1, ("write_end for page %p from pos %lld with %d bytes",
1477 page, pos, copied));
Steve Frenchad7a2922008-02-07 23:25:02 +00001478
Jeff Laytona98ee8c2008-11-26 19:32:33 +00001479 if (PageChecked(page)) {
1480 if (copied == len)
1481 SetPageUptodate(page);
1482 ClearPageChecked(page);
1483 } else if (!PageUptodate(page) && copied == PAGE_CACHE_SIZE)
Nick Piggind9414772008-09-24 11:32:59 -04001484 SetPageUptodate(page);
1485
Linus Torvalds1da177e2005-04-16 15:20:36 -07001486 if (!PageUptodate(page)) {
Nick Piggind9414772008-09-24 11:32:59 -04001487 char *page_data;
1488 unsigned offset = pos & (PAGE_CACHE_SIZE - 1);
1489 int xid;
1490
1491 xid = GetXid();
Linus Torvalds1da177e2005-04-16 15:20:36 -07001492 /* this is probably better than directly calling
1493 partialpage_write since in this function the file handle is
1494 known which we might as well leverage */
1495 /* BB check if anything else missing out of ppw
1496 such as updating last write time */
1497 page_data = kmap(page);
Nick Piggind9414772008-09-24 11:32:59 -04001498 rc = cifs_write(file, page_data + offset, copied, &pos);
1499 /* if (rc < 0) should we set writebehind rc? */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001500 kunmap(page);
Nick Piggind9414772008-09-24 11:32:59 -04001501
1502 FreeXid(xid);
Steve Frenchfb8c4b12007-07-10 01:16:18 +00001503 } else {
Nick Piggind9414772008-09-24 11:32:59 -04001504 rc = copied;
1505 pos += copied;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001506 set_page_dirty(page);
1507 }
1508
Nick Piggind9414772008-09-24 11:32:59 -04001509 if (rc > 0) {
1510 spin_lock(&inode->i_lock);
1511 if (pos > inode->i_size)
1512 i_size_write(inode, pos);
1513 spin_unlock(&inode->i_lock);
1514 }
1515
1516 unlock_page(page);
1517 page_cache_release(page);
1518
Linus Torvalds1da177e2005-04-16 15:20:36 -07001519 return rc;
1520}
1521
1522int cifs_fsync(struct file *file, struct dentry *dentry, int datasync)
1523{
1524 int xid;
1525 int rc = 0;
Josef "Jeff" Sipeke6a00292006-12-08 02:36:48 -08001526 struct inode *inode = file->f_path.dentry->d_inode;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001527
1528 xid = GetXid();
1529
Steve Frenchfb8c4b12007-07-10 01:16:18 +00001530 cFYI(1, ("Sync file - name: %s datasync: 0x%x",
Linus Torvalds1da177e2005-04-16 15:20:36 -07001531 dentry->d_name.name, datasync));
Steve French50c2f752007-07-13 00:33:32 +00001532
Jeff Laytoncea21802007-11-20 23:19:03 +00001533 rc = filemap_write_and_wait(inode->i_mapping);
1534 if (rc == 0) {
1535 rc = CIFS_I(inode)->write_behind_rc;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001536 CIFS_I(inode)->write_behind_rc = 0;
Jeff Laytoncea21802007-11-20 23:19:03 +00001537 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001538 FreeXid(xid);
1539 return rc;
1540}
1541
NeilBrown3978d712006-03-26 01:37:17 -08001542/* static void cifs_sync_page(struct page *page)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001543{
1544 struct address_space *mapping;
1545 struct inode *inode;
1546 unsigned long index = page->index;
1547 unsigned int rpages = 0;
1548 int rc = 0;
1549
1550 cFYI(1, ("sync page %p",page));
1551 mapping = page->mapping;
1552 if (!mapping)
1553 return 0;
1554 inode = mapping->host;
1555 if (!inode)
NeilBrown3978d712006-03-26 01:37:17 -08001556 return; */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001557
Steve Frenchfb8c4b12007-07-10 01:16:18 +00001558/* fill in rpages then
Linus Torvalds1da177e2005-04-16 15:20:36 -07001559 result = cifs_pagein_inode(inode, index, rpages); */ /* BB finish */
1560
Steve French26a21b92006-05-31 18:05:34 +00001561/* cFYI(1, ("rpages is %d for sync page of Index %ld", rpages, index));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001562
NeilBrown3978d712006-03-26 01:37:17 -08001563#if 0
Linus Torvalds1da177e2005-04-16 15:20:36 -07001564 if (rc < 0)
1565 return rc;
1566 return 0;
NeilBrown3978d712006-03-26 01:37:17 -08001567#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -07001568} */
1569
1570/*
1571 * As file closes, flush all cached write data for this inode checking
1572 * for write behind errors.
1573 */
Miklos Szeredi75e1fcc2006-06-23 02:05:12 -07001574int cifs_flush(struct file *file, fl_owner_t id)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001575{
Steve Frenchfb8c4b12007-07-10 01:16:18 +00001576 struct inode *inode = file->f_path.dentry->d_inode;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001577 int rc = 0;
1578
1579 /* Rather than do the steps manually:
1580 lock the inode for writing
1581 loop through pages looking for write behind data (dirty pages)
1582 coalesce into contiguous 16K (or smaller) chunks to write to server
1583 send to server (prefer in parallel)
1584 deal with writebehind errors
1585 unlock inode for writing
1586 filemapfdatawrite appears easier for the time being */
1587
1588 rc = filemap_fdatawrite(inode->i_mapping);
Jeff Laytoncea21802007-11-20 23:19:03 +00001589 /* reset wb rc if we were able to write out dirty pages */
1590 if (!rc) {
1591 rc = CIFS_I(inode)->write_behind_rc;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001592 CIFS_I(inode)->write_behind_rc = 0;
Jeff Laytoncea21802007-11-20 23:19:03 +00001593 }
Steve French50c2f752007-07-13 00:33:32 +00001594
Steve Frenchfb8c4b12007-07-10 01:16:18 +00001595 cFYI(1, ("Flush inode %p file %p rc %d", inode, file, rc));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001596
1597 return rc;
1598}
1599
1600ssize_t cifs_user_read(struct file *file, char __user *read_data,
1601 size_t read_size, loff_t *poffset)
1602{
1603 int rc = -EACCES;
1604 unsigned int bytes_read = 0;
1605 unsigned int total_read = 0;
1606 unsigned int current_read_size;
1607 struct cifs_sb_info *cifs_sb;
1608 struct cifsTconInfo *pTcon;
1609 int xid;
1610 struct cifsFileInfo *open_file;
1611 char *smb_read_data;
1612 char __user *current_offset;
1613 struct smb_com_read_rsp *pSMBr;
1614
1615 xid = GetXid();
Josef "Jeff" Sipeke6a00292006-12-08 02:36:48 -08001616 cifs_sb = CIFS_SB(file->f_path.dentry->d_sb);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001617 pTcon = cifs_sb->tcon;
1618
1619 if (file->private_data == NULL) {
1620 FreeXid(xid);
1621 return -EBADF;
1622 }
1623 open_file = (struct cifsFileInfo *)file->private_data;
1624
Steve Frenchad7a2922008-02-07 23:25:02 +00001625 if ((file->f_flags & O_ACCMODE) == O_WRONLY)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001626 cFYI(1, ("attempting read on write only file instance"));
Steve Frenchad7a2922008-02-07 23:25:02 +00001627
Linus Torvalds1da177e2005-04-16 15:20:36 -07001628 for (total_read = 0, current_offset = read_data;
1629 read_size > total_read;
1630 total_read += bytes_read, current_offset += bytes_read) {
Steve Frenchfb8c4b12007-07-10 01:16:18 +00001631 current_read_size = min_t(const int, read_size - total_read,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001632 cifs_sb->rsize);
1633 rc = -EAGAIN;
1634 smb_read_data = NULL;
1635 while (rc == -EAGAIN) {
Steve Frenchec637e32005-12-12 20:53:18 -08001636 int buf_type = CIFS_NO_BUFFER;
Steve Frenchfb8c4b12007-07-10 01:16:18 +00001637 if ((open_file->invalidHandle) &&
Linus Torvalds1da177e2005-04-16 15:20:36 -07001638 (!open_file->closePend)) {
Steve French4b18f2a2008-04-29 00:06:05 +00001639 rc = cifs_reopen_file(file, true);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001640 if (rc != 0)
1641 break;
1642 }
Steve Frenchbfa0d752005-08-31 21:50:37 -07001643 rc = CIFSSMBRead(xid, pTcon,
Steve Frenchec637e32005-12-12 20:53:18 -08001644 open_file->netfid,
1645 current_read_size, *poffset,
1646 &bytes_read, &smb_read_data,
1647 &buf_type);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001648 pSMBr = (struct smb_com_read_rsp *)smb_read_data;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001649 if (smb_read_data) {
Steve French93544cc2006-02-14 22:30:52 -06001650 if (copy_to_user(current_offset,
1651 smb_read_data +
1652 4 /* RFC1001 length field */ +
1653 le16_to_cpu(pSMBr->DataOffset),
Steve Frenchad7a2922008-02-07 23:25:02 +00001654 bytes_read))
Steve French93544cc2006-02-14 22:30:52 -06001655 rc = -EFAULT;
Steve French93544cc2006-02-14 22:30:52 -06001656
Steve Frenchfb8c4b12007-07-10 01:16:18 +00001657 if (buf_type == CIFS_SMALL_BUFFER)
Steve Frenchec637e32005-12-12 20:53:18 -08001658 cifs_small_buf_release(smb_read_data);
Steve Frenchfb8c4b12007-07-10 01:16:18 +00001659 else if (buf_type == CIFS_LARGE_BUFFER)
Steve Frenchec637e32005-12-12 20:53:18 -08001660 cifs_buf_release(smb_read_data);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001661 smb_read_data = NULL;
1662 }
1663 }
1664 if (rc || (bytes_read == 0)) {
1665 if (total_read) {
1666 break;
1667 } else {
1668 FreeXid(xid);
1669 return rc;
1670 }
1671 } else {
Steve Frencha4544342005-08-24 13:59:35 -07001672 cifs_stats_bytes_read(pTcon, bytes_read);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001673 *poffset += bytes_read;
1674 }
1675 }
1676 FreeXid(xid);
1677 return total_read;
1678}
1679
1680
1681static ssize_t cifs_read(struct file *file, char *read_data, size_t read_size,
1682 loff_t *poffset)
1683{
1684 int rc = -EACCES;
1685 unsigned int bytes_read = 0;
1686 unsigned int total_read;
1687 unsigned int current_read_size;
1688 struct cifs_sb_info *cifs_sb;
1689 struct cifsTconInfo *pTcon;
1690 int xid;
1691 char *current_offset;
1692 struct cifsFileInfo *open_file;
Steve Frenchec637e32005-12-12 20:53:18 -08001693 int buf_type = CIFS_NO_BUFFER;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001694
1695 xid = GetXid();
Josef "Jeff" Sipeke6a00292006-12-08 02:36:48 -08001696 cifs_sb = CIFS_SB(file->f_path.dentry->d_sb);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001697 pTcon = cifs_sb->tcon;
1698
1699 if (file->private_data == NULL) {
1700 FreeXid(xid);
1701 return -EBADF;
1702 }
1703 open_file = (struct cifsFileInfo *)file->private_data;
1704
1705 if ((file->f_flags & O_ACCMODE) == O_WRONLY)
1706 cFYI(1, ("attempting read on write only file instance"));
1707
Steve Frenchfb8c4b12007-07-10 01:16:18 +00001708 for (total_read = 0, current_offset = read_data;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001709 read_size > total_read;
1710 total_read += bytes_read, current_offset += bytes_read) {
1711 current_read_size = min_t(const int, read_size - total_read,
1712 cifs_sb->rsize);
Steve Frenchf9f5c8172005-09-15 23:06:38 -07001713 /* For windows me and 9x we do not want to request more
1714 than it negotiated since it will refuse the read then */
Steve Frenchfb8c4b12007-07-10 01:16:18 +00001715 if ((pTcon->ses) &&
Steve Frenchf9f5c8172005-09-15 23:06:38 -07001716 !(pTcon->ses->capabilities & CAP_LARGE_FILES)) {
1717 current_read_size = min_t(const int, current_read_size,
1718 pTcon->ses->server->maxBuf - 128);
1719 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001720 rc = -EAGAIN;
1721 while (rc == -EAGAIN) {
Steve Frenchfb8c4b12007-07-10 01:16:18 +00001722 if ((open_file->invalidHandle) &&
Linus Torvalds1da177e2005-04-16 15:20:36 -07001723 (!open_file->closePend)) {
Steve French4b18f2a2008-04-29 00:06:05 +00001724 rc = cifs_reopen_file(file, true);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001725 if (rc != 0)
1726 break;
1727 }
Steve Frenchbfa0d752005-08-31 21:50:37 -07001728 rc = CIFSSMBRead(xid, pTcon,
Steve Frenchec637e32005-12-12 20:53:18 -08001729 open_file->netfid,
1730 current_read_size, *poffset,
1731 &bytes_read, &current_offset,
1732 &buf_type);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001733 }
1734 if (rc || (bytes_read == 0)) {
1735 if (total_read) {
1736 break;
1737 } else {
1738 FreeXid(xid);
1739 return rc;
1740 }
1741 } else {
Steve Frencha4544342005-08-24 13:59:35 -07001742 cifs_stats_bytes_read(pTcon, total_read);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001743 *poffset += bytes_read;
1744 }
1745 }
1746 FreeXid(xid);
1747 return total_read;
1748}
1749
1750int cifs_file_mmap(struct file *file, struct vm_area_struct *vma)
1751{
Josef "Jeff" Sipeke6a00292006-12-08 02:36:48 -08001752 struct dentry *dentry = file->f_path.dentry;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001753 int rc, xid;
1754
1755 xid = GetXid();
1756 rc = cifs_revalidate(dentry);
1757 if (rc) {
1758 cFYI(1, ("Validation prior to mmap failed, error=%d", rc));
1759 FreeXid(xid);
1760 return rc;
1761 }
1762 rc = generic_file_mmap(file, vma);
1763 FreeXid(xid);
1764 return rc;
1765}
1766
1767
Steve Frenchfb8c4b12007-07-10 01:16:18 +00001768static void cifs_copy_cache_pages(struct address_space *mapping,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001769 struct list_head *pages, int bytes_read, char *data,
1770 struct pagevec *plru_pvec)
1771{
1772 struct page *page;
1773 char *target;
1774
1775 while (bytes_read > 0) {
1776 if (list_empty(pages))
1777 break;
1778
1779 page = list_entry(pages->prev, struct page, lru);
1780 list_del(&page->lru);
1781
1782 if (add_to_page_cache(page, mapping, page->index,
1783 GFP_KERNEL)) {
1784 page_cache_release(page);
1785 cFYI(1, ("Add page cache failed"));
Steve French3079ca62005-06-09 14:44:07 -07001786 data += PAGE_CACHE_SIZE;
1787 bytes_read -= PAGE_CACHE_SIZE;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001788 continue;
1789 }
1790
Steve Frenchfb8c4b12007-07-10 01:16:18 +00001791 target = kmap_atomic(page, KM_USER0);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001792
1793 if (PAGE_CACHE_SIZE > bytes_read) {
1794 memcpy(target, data, bytes_read);
1795 /* zero the tail end of this partial page */
Steve Frenchfb8c4b12007-07-10 01:16:18 +00001796 memset(target + bytes_read, 0,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001797 PAGE_CACHE_SIZE - bytes_read);
1798 bytes_read = 0;
1799 } else {
1800 memcpy(target, data, PAGE_CACHE_SIZE);
1801 bytes_read -= PAGE_CACHE_SIZE;
1802 }
1803 kunmap_atomic(target, KM_USER0);
1804
1805 flush_dcache_page(page);
1806 SetPageUptodate(page);
1807 unlock_page(page);
1808 if (!pagevec_add(plru_pvec, page))
Rik van Riel4f98a2f2008-10-18 20:26:32 -07001809 __pagevec_lru_add_file(plru_pvec);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001810 data += PAGE_CACHE_SIZE;
1811 }
1812 return;
1813}
1814
1815static int cifs_readpages(struct file *file, struct address_space *mapping,
1816 struct list_head *page_list, unsigned num_pages)
1817{
1818 int rc = -EACCES;
1819 int xid;
1820 loff_t offset;
1821 struct page *page;
1822 struct cifs_sb_info *cifs_sb;
1823 struct cifsTconInfo *pTcon;
Steve French2c2130e2007-10-12 19:10:28 +00001824 unsigned int bytes_read = 0;
Steve Frenchfb8c4b12007-07-10 01:16:18 +00001825 unsigned int read_size, i;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001826 char *smb_read_data = NULL;
1827 struct smb_com_read_rsp *pSMBr;
1828 struct pagevec lru_pvec;
1829 struct cifsFileInfo *open_file;
Steve Frenchec637e32005-12-12 20:53:18 -08001830 int buf_type = CIFS_NO_BUFFER;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001831
1832 xid = GetXid();
1833 if (file->private_data == NULL) {
1834 FreeXid(xid);
1835 return -EBADF;
1836 }
1837 open_file = (struct cifsFileInfo *)file->private_data;
Josef "Jeff" Sipeke6a00292006-12-08 02:36:48 -08001838 cifs_sb = CIFS_SB(file->f_path.dentry->d_sb);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001839 pTcon = cifs_sb->tcon;
Steve Frenchbfa0d752005-08-31 21:50:37 -07001840
Linus Torvalds1da177e2005-04-16 15:20:36 -07001841 pagevec_init(&lru_pvec, 0);
Steve French61de8002008-10-30 20:15:22 +00001842 cFYI(DBG2, ("rpages: num pages %d", num_pages));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001843 for (i = 0; i < num_pages; ) {
1844 unsigned contig_pages;
1845 struct page *tmp_page;
1846 unsigned long expected_index;
1847
1848 if (list_empty(page_list))
1849 break;
1850
1851 page = list_entry(page_list->prev, struct page, lru);
1852 offset = (loff_t)page->index << PAGE_CACHE_SHIFT;
1853
1854 /* count adjacent pages that we will read into */
1855 contig_pages = 0;
Steve Frenchfb8c4b12007-07-10 01:16:18 +00001856 expected_index =
Linus Torvalds1da177e2005-04-16 15:20:36 -07001857 list_entry(page_list->prev, struct page, lru)->index;
Steve Frenchfb8c4b12007-07-10 01:16:18 +00001858 list_for_each_entry_reverse(tmp_page, page_list, lru) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001859 if (tmp_page->index == expected_index) {
1860 contig_pages++;
1861 expected_index++;
1862 } else
Steve Frenchfb8c4b12007-07-10 01:16:18 +00001863 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001864 }
1865 if (contig_pages + i > num_pages)
1866 contig_pages = num_pages - i;
1867
1868 /* for reads over a certain size could initiate async
1869 read ahead */
1870
1871 read_size = contig_pages * PAGE_CACHE_SIZE;
1872 /* Read size needs to be in multiples of one page */
1873 read_size = min_t(const unsigned int, read_size,
1874 cifs_sb->rsize & PAGE_CACHE_MASK);
Steve French90c81e02008-02-12 20:32:36 +00001875 cFYI(DBG2, ("rpages: read size 0x%x contiguous pages %d",
Steve French75865f8c2007-06-24 18:30:48 +00001876 read_size, contig_pages));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001877 rc = -EAGAIN;
1878 while (rc == -EAGAIN) {
Steve Frenchfb8c4b12007-07-10 01:16:18 +00001879 if ((open_file->invalidHandle) &&
Linus Torvalds1da177e2005-04-16 15:20:36 -07001880 (!open_file->closePend)) {
Steve French4b18f2a2008-04-29 00:06:05 +00001881 rc = cifs_reopen_file(file, true);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001882 if (rc != 0)
1883 break;
1884 }
1885
Steve Frenchbfa0d752005-08-31 21:50:37 -07001886 rc = CIFSSMBRead(xid, pTcon,
Steve Frenchec637e32005-12-12 20:53:18 -08001887 open_file->netfid,
1888 read_size, offset,
1889 &bytes_read, &smb_read_data,
1890 &buf_type);
Steve Frencha9d02ad2005-08-24 23:06:05 -07001891 /* BB more RC checks ? */
Steve Frenchfb8c4b12007-07-10 01:16:18 +00001892 if (rc == -EAGAIN) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001893 if (smb_read_data) {
Steve Frenchfb8c4b12007-07-10 01:16:18 +00001894 if (buf_type == CIFS_SMALL_BUFFER)
Steve Frenchec637e32005-12-12 20:53:18 -08001895 cifs_small_buf_release(smb_read_data);
Steve Frenchfb8c4b12007-07-10 01:16:18 +00001896 else if (buf_type == CIFS_LARGE_BUFFER)
Steve Frenchec637e32005-12-12 20:53:18 -08001897 cifs_buf_release(smb_read_data);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001898 smb_read_data = NULL;
1899 }
1900 }
1901 }
1902 if ((rc < 0) || (smb_read_data == NULL)) {
1903 cFYI(1, ("Read error in readpages: %d", rc));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001904 break;
1905 } else if (bytes_read > 0) {
Andrew Morton6f88cc22006-12-10 02:19:44 -08001906 task_io_account_read(bytes_read);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001907 pSMBr = (struct smb_com_read_rsp *)smb_read_data;
1908 cifs_copy_cache_pages(mapping, page_list, bytes_read,
1909 smb_read_data + 4 /* RFC1001 hdr */ +
1910 le16_to_cpu(pSMBr->DataOffset), &lru_pvec);
1911
1912 i += bytes_read >> PAGE_CACHE_SHIFT;
Steve Frencha4544342005-08-24 13:59:35 -07001913 cifs_stats_bytes_read(pTcon, bytes_read);
Steve French2c2130e2007-10-12 19:10:28 +00001914 if ((bytes_read & PAGE_CACHE_MASK) != bytes_read) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001915 i++; /* account for partial page */
1916
Steve Frenchfb8c4b12007-07-10 01:16:18 +00001917 /* server copy of file can have smaller size
Linus Torvalds1da177e2005-04-16 15:20:36 -07001918 than client */
Steve Frenchfb8c4b12007-07-10 01:16:18 +00001919 /* BB do we need to verify this common case ?
1920 this case is ok - if we are at server EOF
Linus Torvalds1da177e2005-04-16 15:20:36 -07001921 we will hit it on next read */
1922
OGAWA Hirofumi05ac9d42006-11-02 22:07:08 -08001923 /* break; */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001924 }
1925 } else {
1926 cFYI(1, ("No bytes read (%d) at offset %lld . "
1927 "Cleaning remaining pages from readahead list",
1928 bytes_read, offset));
Steve Frenchfb8c4b12007-07-10 01:16:18 +00001929 /* BB turn off caching and do new lookup on
Linus Torvalds1da177e2005-04-16 15:20:36 -07001930 file size at server? */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001931 break;
1932 }
1933 if (smb_read_data) {
Steve Frenchfb8c4b12007-07-10 01:16:18 +00001934 if (buf_type == CIFS_SMALL_BUFFER)
Steve Frenchec637e32005-12-12 20:53:18 -08001935 cifs_small_buf_release(smb_read_data);
Steve Frenchfb8c4b12007-07-10 01:16:18 +00001936 else if (buf_type == CIFS_LARGE_BUFFER)
Steve Frenchec637e32005-12-12 20:53:18 -08001937 cifs_buf_release(smb_read_data);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001938 smb_read_data = NULL;
1939 }
1940 bytes_read = 0;
1941 }
1942
Rik van Riel4f98a2f2008-10-18 20:26:32 -07001943 pagevec_lru_add_file(&lru_pvec);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001944
1945/* need to free smb_read_data buf before exit */
1946 if (smb_read_data) {
Steve Frenchfb8c4b12007-07-10 01:16:18 +00001947 if (buf_type == CIFS_SMALL_BUFFER)
Steve French47c886b2006-01-18 14:20:39 -08001948 cifs_small_buf_release(smb_read_data);
Steve Frenchfb8c4b12007-07-10 01:16:18 +00001949 else if (buf_type == CIFS_LARGE_BUFFER)
Steve French47c886b2006-01-18 14:20:39 -08001950 cifs_buf_release(smb_read_data);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001951 smb_read_data = NULL;
Steve Frenchfb8c4b12007-07-10 01:16:18 +00001952 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001953
1954 FreeXid(xid);
1955 return rc;
1956}
1957
1958static int cifs_readpage_worker(struct file *file, struct page *page,
1959 loff_t *poffset)
1960{
1961 char *read_data;
1962 int rc;
1963
1964 page_cache_get(page);
1965 read_data = kmap(page);
1966 /* for reads over a certain size could initiate async read ahead */
Steve Frenchfb8c4b12007-07-10 01:16:18 +00001967
Linus Torvalds1da177e2005-04-16 15:20:36 -07001968 rc = cifs_read(file, read_data, PAGE_CACHE_SIZE, poffset);
Steve Frenchfb8c4b12007-07-10 01:16:18 +00001969
Linus Torvalds1da177e2005-04-16 15:20:36 -07001970 if (rc < 0)
1971 goto io_error;
1972 else
Steve Frenchfb8c4b12007-07-10 01:16:18 +00001973 cFYI(1, ("Bytes read %d", rc));
1974
Josef "Jeff" Sipeke6a00292006-12-08 02:36:48 -08001975 file->f_path.dentry->d_inode->i_atime =
1976 current_fs_time(file->f_path.dentry->d_inode->i_sb);
Steve Frenchfb8c4b12007-07-10 01:16:18 +00001977
Linus Torvalds1da177e2005-04-16 15:20:36 -07001978 if (PAGE_CACHE_SIZE > rc)
1979 memset(read_data + rc, 0, PAGE_CACHE_SIZE - rc);
1980
1981 flush_dcache_page(page);
1982 SetPageUptodate(page);
1983 rc = 0;
Steve Frenchfb8c4b12007-07-10 01:16:18 +00001984
Linus Torvalds1da177e2005-04-16 15:20:36 -07001985io_error:
Steve Frenchfb8c4b12007-07-10 01:16:18 +00001986 kunmap(page);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001987 page_cache_release(page);
1988 return rc;
1989}
1990
1991static int cifs_readpage(struct file *file, struct page *page)
1992{
1993 loff_t offset = (loff_t)page->index << PAGE_CACHE_SHIFT;
1994 int rc = -EACCES;
1995 int xid;
1996
1997 xid = GetXid();
1998
1999 if (file->private_data == NULL) {
2000 FreeXid(xid);
2001 return -EBADF;
2002 }
2003
Steve Frenchfb8c4b12007-07-10 01:16:18 +00002004 cFYI(1, ("readpage %p at offset %d 0x%x\n",
Linus Torvalds1da177e2005-04-16 15:20:36 -07002005 page, (int)offset, (int)offset));
2006
2007 rc = cifs_readpage_worker(file, page, &offset);
2008
2009 unlock_page(page);
2010
2011 FreeXid(xid);
2012 return rc;
2013}
2014
Steve Frencha403a0a2007-07-26 15:54:16 +00002015static int is_inode_writable(struct cifsInodeInfo *cifs_inode)
2016{
2017 struct cifsFileInfo *open_file;
2018
2019 read_lock(&GlobalSMBSeslock);
2020 list_for_each_entry(open_file, &cifs_inode->openFileList, flist) {
2021 if (open_file->closePend)
2022 continue;
2023 if (open_file->pfile &&
2024 ((open_file->pfile->f_flags & O_RDWR) ||
2025 (open_file->pfile->f_flags & O_WRONLY))) {
2026 read_unlock(&GlobalSMBSeslock);
2027 return 1;
2028 }
2029 }
2030 read_unlock(&GlobalSMBSeslock);
2031 return 0;
2032}
2033
Linus Torvalds1da177e2005-04-16 15:20:36 -07002034/* We do not want to update the file size from server for inodes
2035 open for write - to avoid races with writepage extending
2036 the file - in the future we could consider allowing
Steve Frenchfb8c4b12007-07-10 01:16:18 +00002037 refreshing the inode only on increases in the file size
Linus Torvalds1da177e2005-04-16 15:20:36 -07002038 but this is tricky to do without racing with writebehind
2039 page caching in the current Linux kernel design */
Steve French4b18f2a2008-04-29 00:06:05 +00002040bool is_size_safe_to_change(struct cifsInodeInfo *cifsInode, __u64 end_of_file)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002041{
Steve Frencha403a0a2007-07-26 15:54:16 +00002042 if (!cifsInode)
Steve French4b18f2a2008-04-29 00:06:05 +00002043 return true;
Steve French23e7dd72005-10-20 13:44:56 -07002044
Steve Frencha403a0a2007-07-26 15:54:16 +00002045 if (is_inode_writable(cifsInode)) {
2046 /* This inode is open for write at least once */
Steve Frenchc32a0b62006-01-12 14:41:28 -08002047 struct cifs_sb_info *cifs_sb;
2048
Steve Frenchc32a0b62006-01-12 14:41:28 -08002049 cifs_sb = CIFS_SB(cifsInode->vfs_inode.i_sb);
Steve Frenchad7a2922008-02-07 23:25:02 +00002050 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DIRECT_IO) {
Steve Frenchfb8c4b12007-07-10 01:16:18 +00002051 /* since no page cache to corrupt on directio
Steve Frenchc32a0b62006-01-12 14:41:28 -08002052 we can change size safely */
Steve French4b18f2a2008-04-29 00:06:05 +00002053 return true;
Steve Frenchc32a0b62006-01-12 14:41:28 -08002054 }
2055
Steve Frenchfb8c4b12007-07-10 01:16:18 +00002056 if (i_size_read(&cifsInode->vfs_inode) < end_of_file)
Steve French4b18f2a2008-04-29 00:06:05 +00002057 return true;
Steve French7ba52632007-02-08 18:14:13 +00002058
Steve French4b18f2a2008-04-29 00:06:05 +00002059 return false;
Steve French23e7dd72005-10-20 13:44:56 -07002060 } else
Steve French4b18f2a2008-04-29 00:06:05 +00002061 return true;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002062}
2063
Nick Piggind9414772008-09-24 11:32:59 -04002064static int cifs_write_begin(struct file *file, struct address_space *mapping,
2065 loff_t pos, unsigned len, unsigned flags,
2066 struct page **pagep, void **fsdata)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002067{
Nick Piggind9414772008-09-24 11:32:59 -04002068 pgoff_t index = pos >> PAGE_CACHE_SHIFT;
2069 loff_t offset = pos & (PAGE_CACHE_SIZE - 1);
Jeff Laytona98ee8c2008-11-26 19:32:33 +00002070 loff_t page_start = pos & PAGE_MASK;
2071 loff_t i_size;
2072 struct page *page;
2073 int rc = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002074
Nick Piggind9414772008-09-24 11:32:59 -04002075 cFYI(1, ("write_begin from %lld len %d", (long long)pos, len));
2076
Nick Piggin54566b22009-01-04 12:00:53 -08002077 page = grab_cache_page_write_begin(mapping, index, flags);
Jeff Laytona98ee8c2008-11-26 19:32:33 +00002078 if (!page) {
2079 rc = -ENOMEM;
2080 goto out;
2081 }
Nick Piggind9414772008-09-24 11:32:59 -04002082
Jeff Laytona98ee8c2008-11-26 19:32:33 +00002083 if (PageUptodate(page))
2084 goto out;
Steve French8a236262007-03-06 00:31:00 +00002085
Jeff Laytona98ee8c2008-11-26 19:32:33 +00002086 /*
2087 * If we write a full page it will be up to date, no need to read from
2088 * the server. If the write is short, we'll end up doing a sync write
2089 * instead.
2090 */
2091 if (len == PAGE_CACHE_SIZE)
2092 goto out;
2093
2094 /*
2095 * optimize away the read when we have an oplock, and we're not
2096 * expecting to use any of the data we'd be reading in. That
2097 * is, when the page lies beyond the EOF, or straddles the EOF
2098 * and the write will cover all of the existing data.
2099 */
2100 if (CIFS_I(mapping->host)->clientCanCacheRead) {
2101 i_size = i_size_read(mapping->host);
2102 if (page_start >= i_size ||
2103 (offset == 0 && (pos + len) >= i_size)) {
2104 zero_user_segments(page, 0, offset,
2105 offset + len,
2106 PAGE_CACHE_SIZE);
2107 /*
2108 * PageChecked means that the parts of the page
2109 * to which we're not writing are considered up
2110 * to date. Once the data is copied to the
2111 * page, it can be set uptodate.
2112 */
2113 SetPageChecked(page);
2114 goto out;
2115 }
2116 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07002117
Nick Piggind9414772008-09-24 11:32:59 -04002118 if ((file->f_flags & O_ACCMODE) != O_WRONLY) {
Jeff Laytona98ee8c2008-11-26 19:32:33 +00002119 /*
2120 * might as well read a page, it is fast enough. If we get
2121 * an error, we don't need to return it. cifs_write_end will
2122 * do a sync write instead since PG_uptodate isn't set.
2123 */
2124 cifs_readpage_worker(file, page, &page_start);
Steve French8a236262007-03-06 00:31:00 +00002125 } else {
2126 /* we could try using another file handle if there is one -
2127 but how would we lock it to prevent close of that handle
2128 racing with this read? In any case
Nick Piggind9414772008-09-24 11:32:59 -04002129 this will be written out by write_end so is fine */
Steve French8a236262007-03-06 00:31:00 +00002130 }
Jeff Laytona98ee8c2008-11-26 19:32:33 +00002131out:
2132 *pagep = page;
2133 return rc;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002134}
2135
Christoph Hellwigf5e54d62006-06-28 04:26:44 -07002136const struct address_space_operations cifs_addr_ops = {
Linus Torvalds1da177e2005-04-16 15:20:36 -07002137 .readpage = cifs_readpage,
2138 .readpages = cifs_readpages,
2139 .writepage = cifs_writepage,
Steve French37c0eb42005-10-05 14:50:29 -07002140 .writepages = cifs_writepages,
Nick Piggind9414772008-09-24 11:32:59 -04002141 .write_begin = cifs_write_begin,
2142 .write_end = cifs_write_end,
Linus Torvalds1da177e2005-04-16 15:20:36 -07002143 .set_page_dirty = __set_page_dirty_nobuffers,
2144 /* .sync_page = cifs_sync_page, */
2145 /* .direct_IO = */
2146};
Dave Kleikamp273d81d2006-06-01 19:41:23 +00002147
2148/*
2149 * cifs_readpages requires the server to support a buffer large enough to
2150 * contain the header plus one complete page of data. Otherwise, we need
2151 * to leave cifs_readpages out of the address space operations.
2152 */
Christoph Hellwigf5e54d62006-06-28 04:26:44 -07002153const struct address_space_operations cifs_addr_ops_smallbuf = {
Dave Kleikamp273d81d2006-06-01 19:41:23 +00002154 .readpage = cifs_readpage,
2155 .writepage = cifs_writepage,
2156 .writepages = cifs_writepages,
Nick Piggind9414772008-09-24 11:32:59 -04002157 .write_begin = cifs_write_begin,
2158 .write_end = cifs_write_end,
Dave Kleikamp273d81d2006-06-01 19:41:23 +00002159 .set_page_dirty = __set_page_dirty_nobuffers,
2160 /* .sync_page = cifs_sync_page, */
2161 /* .direct_IO = */
2162};