Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* |
2 | * fs/cifs/file.c | |
3 | * | |
4 | * vfs operations that deal with files | |
fb8c4b14 SF |
5 | * |
6 | * Copyright (C) International Business Machines Corp., 2002,2007 | |
1da177e4 | 7 | * Author(s): Steve French (sfrench@us.ibm.com) |
7ee1af76 | 8 | * Jeremy Allison (jra@samba.org) |
1da177e4 LT |
9 | * |
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> | |
37c0eb46 | 25 | #include <linux/backing-dev.h> |
1da177e4 LT |
26 | #include <linux/stat.h> |
27 | #include <linux/fcntl.h> | |
28 | #include <linux/pagemap.h> | |
29 | #include <linux/pagevec.h> | |
37c0eb46 | 30 | #include <linux/writeback.h> |
6f88cc2e | 31 | #include <linux/task_io_accounting_ops.h> |
23e7dd7d | 32 | #include <linux/delay.h> |
1da177e4 LT |
33 | #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 | ||
42 | static 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; | |
fb8c4b14 | 48 | private_data->pid = current->tgid; |
1da177e4 | 49 | init_MUTEX(&private_data->fh_sem); |
796e5661 | 50 | mutex_init(&private_data->lock_mutex); |
7ee1af76 | 51 | INIT_LIST_HEAD(&private_data->llist); |
1da177e4 LT |
52 | private_data->pfile = file; /* needed for writepage */ |
53 | private_data->pInode = inode; | |
4b18f2a9 SF |
54 | private_data->invalidHandle = false; |
55 | private_data->closePend = false; | |
23e7dd7d SF |
56 | /* 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 */ | |
fb8c4b14 | 60 | atomic_set(&private_data->wrtPending, 0); |
1da177e4 LT |
61 | |
62 | return private_data; | |
63 | } | |
64 | ||
65 | static 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 | ||
e10f7b55 JL |
78 | return (READ_CONTROL | FILE_WRITE_ATTRIBUTES | FILE_READ_ATTRIBUTES | |
79 | FILE_WRITE_EA | FILE_APPEND_DATA | FILE_WRITE_DATA | | |
80 | FILE_READ_DATA); | |
7fc8f4e9 | 81 | } |
e10f7b55 | 82 | |
7fc8f4e9 SF |
83 | static inline fmode_t cifs_posix_convert_flags(unsigned int flags) |
84 | { | |
85 | fmode_t posix_flags = 0; | |
e10f7b55 | 86 | |
7fc8f4e9 SF |
87 | if ((flags & O_ACCMODE) == O_RDONLY) |
88 | posix_flags = FMODE_READ; | |
89 | else if ((flags & O_ACCMODE) == O_WRONLY) | |
90 | posix_flags = FMODE_WRITE; | |
91 | else if ((flags & O_ACCMODE) == O_RDWR) { | |
92 | /* GENERIC_ALL is too much permission to request | |
93 | can cause unnecessary access denied on create */ | |
94 | /* return GENERIC_ALL; */ | |
95 | posix_flags = FMODE_READ | FMODE_WRITE; | |
96 | } | |
97 | /* can not map O_CREAT or O_EXCL or O_TRUNC flags when | |
98 | reopening a file. They had their effect on the original open */ | |
99 | if (flags & O_APPEND) | |
100 | posix_flags |= (fmode_t)O_APPEND; | |
101 | if (flags & O_SYNC) | |
102 | posix_flags |= (fmode_t)O_SYNC; | |
103 | if (flags & O_DIRECTORY) | |
104 | posix_flags |= (fmode_t)O_DIRECTORY; | |
105 | if (flags & O_NOFOLLOW) | |
106 | posix_flags |= (fmode_t)O_NOFOLLOW; | |
107 | if (flags & O_DIRECT) | |
108 | posix_flags |= (fmode_t)O_DIRECT; | |
109 | ||
110 | return posix_flags; | |
1da177e4 LT |
111 | } |
112 | ||
113 | static inline int cifs_get_disposition(unsigned int flags) | |
114 | { | |
115 | if ((flags & (O_CREAT | O_EXCL)) == (O_CREAT | O_EXCL)) | |
116 | return FILE_CREATE; | |
117 | else if ((flags & (O_CREAT | O_TRUNC)) == (O_CREAT | O_TRUNC)) | |
118 | return FILE_OVERWRITE_IF; | |
119 | else if ((flags & O_CREAT) == O_CREAT) | |
120 | return FILE_OPEN_IF; | |
55aa2e09 SF |
121 | else if ((flags & O_TRUNC) == O_TRUNC) |
122 | return FILE_OVERWRITE; | |
1da177e4 LT |
123 | else |
124 | return FILE_OPEN; | |
125 | } | |
126 | ||
127 | /* all arguments to this function must be checked for validity in caller */ | |
128 | static inline int cifs_open_inode_helper(struct inode *inode, struct file *file, | |
129 | struct cifsInodeInfo *pCifsInode, struct cifsFileInfo *pCifsFile, | |
130 | struct cifsTconInfo *pTcon, int *oplock, FILE_ALL_INFO *buf, | |
131 | char *full_path, int xid) | |
132 | { | |
133 | struct timespec temp; | |
134 | int rc; | |
135 | ||
136 | /* want handles we can use to read with first | |
137 | in the list so we do not have to walk the | |
d9414774 | 138 | list to search for one in write_begin */ |
1da177e4 | 139 | if ((file->f_flags & O_ACCMODE) == O_WRONLY) { |
fb8c4b14 | 140 | list_add_tail(&pCifsFile->flist, |
1da177e4 LT |
141 | &pCifsInode->openFileList); |
142 | } else { | |
143 | list_add(&pCifsFile->flist, | |
144 | &pCifsInode->openFileList); | |
145 | } | |
146 | write_unlock(&GlobalSMBSeslock); | |
1da177e4 LT |
147 | if (pCifsInode->clientCanCacheRead) { |
148 | /* we have the inode open somewhere else | |
149 | no need to discard cache data */ | |
150 | goto client_can_cache; | |
151 | } | |
152 | ||
153 | /* BB need same check in cifs_create too? */ | |
154 | /* if not oplocked, invalidate inode pages if mtime or file | |
155 | size changed */ | |
156 | temp = cifs_NTtimeToUnix(le64_to_cpu(buf->LastWriteTime)); | |
e6a00296 JJS |
157 | if (timespec_equal(&file->f_path.dentry->d_inode->i_mtime, &temp) && |
158 | (file->f_path.dentry->d_inode->i_size == | |
1da177e4 LT |
159 | (loff_t)le64_to_cpu(buf->EndOfFile))) { |
160 | cFYI(1, ("inode unchanged on server")); | |
161 | } else { | |
e6a00296 | 162 | if (file->f_path.dentry->d_inode->i_mapping) { |
1da177e4 LT |
163 | /* BB no need to lock inode until after invalidate |
164 | since namei code should already have it locked? */ | |
cea21805 JL |
165 | rc = filemap_write_and_wait(file->f_path.dentry->d_inode->i_mapping); |
166 | if (rc != 0) | |
167 | CIFS_I(file->f_path.dentry->d_inode)->write_behind_rc = rc; | |
1da177e4 LT |
168 | } |
169 | cFYI(1, ("invalidating remote inode since open detected it " | |
170 | "changed")); | |
e6a00296 | 171 | invalidate_remote_inode(file->f_path.dentry->d_inode); |
1da177e4 LT |
172 | } |
173 | ||
174 | client_can_cache: | |
c18c842b | 175 | if (pTcon->unix_ext) |
e6a00296 | 176 | rc = cifs_get_inode_info_unix(&file->f_path.dentry->d_inode, |
1da177e4 LT |
177 | full_path, inode->i_sb, xid); |
178 | else | |
e6a00296 | 179 | rc = cifs_get_inode_info(&file->f_path.dentry->d_inode, |
8b1327f6 | 180 | full_path, buf, inode->i_sb, xid, NULL); |
1da177e4 LT |
181 | |
182 | if ((*oplock & 0xF) == OPLOCK_EXCLUSIVE) { | |
4b18f2a9 SF |
183 | pCifsInode->clientCanCacheAll = true; |
184 | pCifsInode->clientCanCacheRead = true; | |
1da177e4 | 185 | cFYI(1, ("Exclusive Oplock granted on inode %p", |
e6a00296 | 186 | file->f_path.dentry->d_inode)); |
1da177e4 | 187 | } else if ((*oplock & 0xF) == OPLOCK_READ) |
4b18f2a9 | 188 | pCifsInode->clientCanCacheRead = true; |
1da177e4 LT |
189 | |
190 | return rc; | |
191 | } | |
192 | ||
193 | int cifs_open(struct inode *inode, struct file *file) | |
194 | { | |
195 | int rc = -EACCES; | |
196 | int xid, oplock; | |
197 | struct cifs_sb_info *cifs_sb; | |
198 | struct cifsTconInfo *pTcon; | |
199 | struct cifsFileInfo *pCifsFile; | |
200 | struct cifsInodeInfo *pCifsInode; | |
201 | struct list_head *tmp; | |
202 | char *full_path = NULL; | |
203 | int desiredAccess; | |
204 | int disposition; | |
205 | __u16 netfid; | |
206 | FILE_ALL_INFO *buf = NULL; | |
207 | ||
208 | xid = GetXid(); | |
209 | ||
210 | cifs_sb = CIFS_SB(inode->i_sb); | |
211 | pTcon = cifs_sb->tcon; | |
212 | ||
213 | if (file->f_flags & O_CREAT) { | |
214 | /* search inode for this file and fill in file->private_data */ | |
e6a00296 | 215 | pCifsInode = CIFS_I(file->f_path.dentry->d_inode); |
1da177e4 LT |
216 | read_lock(&GlobalSMBSeslock); |
217 | list_for_each(tmp, &pCifsInode->openFileList) { | |
218 | pCifsFile = list_entry(tmp, struct cifsFileInfo, | |
219 | flist); | |
220 | if ((pCifsFile->pfile == NULL) && | |
221 | (pCifsFile->pid == current->tgid)) { | |
222 | /* mode set in cifs_create */ | |
223 | ||
224 | /* needed for writepage */ | |
225 | pCifsFile->pfile = file; | |
50c2f753 | 226 | |
1da177e4 LT |
227 | file->private_data = pCifsFile; |
228 | break; | |
229 | } | |
230 | } | |
231 | read_unlock(&GlobalSMBSeslock); | |
232 | if (file->private_data != NULL) { | |
233 | rc = 0; | |
234 | FreeXid(xid); | |
235 | return rc; | |
236 | } else { | |
237 | if (file->f_flags & O_EXCL) | |
238 | cERROR(1, ("could not find file instance for " | |
26a21b98 | 239 | "new file %p", file)); |
1da177e4 LT |
240 | } |
241 | } | |
242 | ||
e6a00296 | 243 | full_path = build_path_from_dentry(file->f_path.dentry); |
1da177e4 LT |
244 | if (full_path == NULL) { |
245 | FreeXid(xid); | |
246 | return -ENOMEM; | |
247 | } | |
248 | ||
7521a3c5 | 249 | cFYI(1, ("inode = 0x%p file flags are 0x%x for %s", |
1da177e4 LT |
250 | inode, file->f_flags, full_path)); |
251 | desiredAccess = cifs_convert_flags(file->f_flags); | |
252 | ||
253 | /********************************************************************* | |
254 | * open flag mapping table: | |
fb8c4b14 | 255 | * |
1da177e4 | 256 | * POSIX Flag CIFS Disposition |
fb8c4b14 | 257 | * ---------- ---------------- |
1da177e4 LT |
258 | * O_CREAT FILE_OPEN_IF |
259 | * O_CREAT | O_EXCL FILE_CREATE | |
260 | * O_CREAT | O_TRUNC FILE_OVERWRITE_IF | |
261 | * O_TRUNC FILE_OVERWRITE | |
262 | * none of the above FILE_OPEN | |
263 | * | |
264 | * Note that there is not a direct match between disposition | |
fb8c4b14 | 265 | * FILE_SUPERSEDE (ie create whether or not file exists although |
1da177e4 LT |
266 | * O_CREAT | O_TRUNC is similar but truncates the existing |
267 | * file rather than creating a new file as FILE_SUPERSEDE does | |
268 | * (which uses the attributes / metadata passed in on open call) | |
269 | *? | |
fb8c4b14 | 270 | *? O_SYNC is a reasonable match to CIFS writethrough flag |
1da177e4 LT |
271 | *? and the read write flags match reasonably. O_LARGEFILE |
272 | *? is irrelevant because largefile support is always used | |
273 | *? by this client. Flags O_APPEND, O_DIRECT, O_DIRECTORY, | |
274 | * O_FASYNC, O_NOFOLLOW, O_NONBLOCK need further investigation | |
275 | *********************************************************************/ | |
276 | ||
277 | disposition = cifs_get_disposition(file->f_flags); | |
278 | ||
279 | if (oplockEnabled) | |
280 | oplock = REQ_OPLOCK; | |
281 | else | |
4b18f2a9 | 282 | oplock = 0; |
1da177e4 LT |
283 | |
284 | /* BB pass O_SYNC flag through on file attributes .. BB */ | |
285 | ||
286 | /* Also refresh inode by passing in file_info buf returned by SMBOpen | |
287 | and calling get_inode_info with returned buf (at least helps | |
288 | non-Unix server case) */ | |
289 | ||
fb8c4b14 SF |
290 | /* BB we can not do this if this is the second open of a file |
291 | and the first handle has writebehind data, we might be | |
1da177e4 LT |
292 | able to simply do a filemap_fdatawrite/filemap_fdatawait first */ |
293 | buf = kmalloc(sizeof(FILE_ALL_INFO), GFP_KERNEL); | |
294 | if (!buf) { | |
295 | rc = -ENOMEM; | |
296 | goto out; | |
297 | } | |
5bafd765 SF |
298 | |
299 | if (cifs_sb->tcon->ses->capabilities & CAP_NT_SMBS) | |
fb8c4b14 | 300 | rc = CIFSSMBOpen(xid, pTcon, full_path, disposition, |
5bafd765 | 301 | desiredAccess, CREATE_NOT_DIR, &netfid, &oplock, buf, |
737b758c SF |
302 | cifs_sb->local_nls, cifs_sb->mnt_cifs_flags |
303 | & CIFS_MOUNT_MAP_SPECIAL_CHR); | |
5bafd765 SF |
304 | else |
305 | rc = -EIO; /* no NT SMB support fall into legacy open below */ | |
306 | ||
a9d02ad4 SF |
307 | if (rc == -EIO) { |
308 | /* Old server, try legacy style OpenX */ | |
309 | rc = SMBLegacyOpen(xid, pTcon, full_path, disposition, | |
310 | desiredAccess, CREATE_NOT_DIR, &netfid, &oplock, buf, | |
311 | cifs_sb->local_nls, cifs_sb->mnt_cifs_flags | |
312 | & CIFS_MOUNT_MAP_SPECIAL_CHR); | |
313 | } | |
1da177e4 | 314 | if (rc) { |
26a21b98 | 315 | cFYI(1, ("cifs_open returned 0x%x", rc)); |
1da177e4 LT |
316 | goto out; |
317 | } | |
318 | file->private_data = | |
319 | kmalloc(sizeof(struct cifsFileInfo), GFP_KERNEL); | |
320 | if (file->private_data == NULL) { | |
321 | rc = -ENOMEM; | |
322 | goto out; | |
323 | } | |
324 | pCifsFile = cifs_init_private(file->private_data, inode, file, netfid); | |
1da177e4 LT |
325 | write_lock(&GlobalSMBSeslock); |
326 | list_add(&pCifsFile->tlist, &pTcon->openFileList); | |
327 | ||
e6a00296 | 328 | pCifsInode = CIFS_I(file->f_path.dentry->d_inode); |
1da177e4 LT |
329 | if (pCifsInode) { |
330 | rc = cifs_open_inode_helper(inode, file, pCifsInode, | |
331 | pCifsFile, pTcon, | |
332 | &oplock, buf, full_path, xid); | |
333 | } else { | |
334 | write_unlock(&GlobalSMBSeslock); | |
1da177e4 LT |
335 | } |
336 | ||
fb8c4b14 | 337 | if (oplock & CIFS_CREATE_ACTION) { |
1da177e4 LT |
338 | /* time to set mode which we can not set earlier due to |
339 | problems creating new read-only files */ | |
c18c842b | 340 | if (pTcon->unix_ext) { |
4e1e7fb9 JL |
341 | struct cifs_unix_set_info_args args = { |
342 | .mode = inode->i_mode, | |
343 | .uid = NO_CHANGE_64, | |
344 | .gid = NO_CHANGE_64, | |
345 | .ctime = NO_CHANGE_64, | |
346 | .atime = NO_CHANGE_64, | |
347 | .mtime = NO_CHANGE_64, | |
348 | .device = 0, | |
349 | }; | |
350 | CIFSSMBUnixSetInfo(xid, pTcon, full_path, &args, | |
737b758c | 351 | cifs_sb->local_nls, |
fb8c4b14 | 352 | cifs_sb->mnt_cifs_flags & |
737b758c | 353 | CIFS_MOUNT_MAP_SPECIAL_CHR); |
1da177e4 LT |
354 | } |
355 | } | |
356 | ||
357 | out: | |
358 | kfree(buf); | |
359 | kfree(full_path); | |
360 | FreeXid(xid); | |
361 | return rc; | |
362 | } | |
363 | ||
0418726b | 364 | /* Try to reacquire byte range locks that were released when session */ |
1da177e4 LT |
365 | /* to server was lost */ |
366 | static int cifs_relock_file(struct cifsFileInfo *cifsFile) | |
367 | { | |
368 | int rc = 0; | |
369 | ||
370 | /* BB list all locks open on this file and relock */ | |
371 | ||
372 | return rc; | |
373 | } | |
374 | ||
4b18f2a9 | 375 | static int cifs_reopen_file(struct file *file, bool can_flush) |
1da177e4 LT |
376 | { |
377 | int rc = -EACCES; | |
378 | int xid, oplock; | |
379 | struct cifs_sb_info *cifs_sb; | |
7fc8f4e9 | 380 | struct cifsTconInfo *tcon; |
1da177e4 LT |
381 | struct cifsFileInfo *pCifsFile; |
382 | struct cifsInodeInfo *pCifsInode; | |
fb8c4b14 | 383 | struct inode *inode; |
1da177e4 LT |
384 | char *full_path = NULL; |
385 | int desiredAccess; | |
386 | int disposition = FILE_OPEN; | |
387 | __u16 netfid; | |
388 | ||
ad7a2926 | 389 | if (file->private_data) |
1da177e4 | 390 | pCifsFile = (struct cifsFileInfo *)file->private_data; |
ad7a2926 | 391 | else |
1da177e4 LT |
392 | return -EBADF; |
393 | ||
394 | xid = GetXid(); | |
395 | down(&pCifsFile->fh_sem); | |
4b18f2a9 | 396 | if (!pCifsFile->invalidHandle) { |
1da177e4 LT |
397 | up(&pCifsFile->fh_sem); |
398 | FreeXid(xid); | |
399 | return 0; | |
400 | } | |
401 | ||
e6a00296 | 402 | if (file->f_path.dentry == NULL) { |
3a9f462f SF |
403 | cERROR(1, ("no valid name if dentry freed")); |
404 | dump_stack(); | |
405 | rc = -EBADF; | |
406 | goto reopen_error_exit; | |
407 | } | |
408 | ||
409 | inode = file->f_path.dentry->d_inode; | |
fb8c4b14 | 410 | if (inode == NULL) { |
3a9f462f SF |
411 | cERROR(1, ("inode not valid")); |
412 | dump_stack(); | |
413 | rc = -EBADF; | |
414 | goto reopen_error_exit; | |
1da177e4 | 415 | } |
50c2f753 | 416 | |
1da177e4 | 417 | cifs_sb = CIFS_SB(inode->i_sb); |
7fc8f4e9 | 418 | tcon = cifs_sb->tcon; |
3a9f462f | 419 | |
1da177e4 LT |
420 | /* can not grab rename sem here because various ops, including |
421 | those that already have the rename sem can end up causing writepage | |
422 | to get called and if the server was down that means we end up here, | |
423 | and we can never tell if the caller already has the rename_sem */ | |
e6a00296 | 424 | full_path = build_path_from_dentry(file->f_path.dentry); |
1da177e4 | 425 | if (full_path == NULL) { |
3a9f462f SF |
426 | rc = -ENOMEM; |
427 | reopen_error_exit: | |
1da177e4 LT |
428 | up(&pCifsFile->fh_sem); |
429 | FreeXid(xid); | |
3a9f462f | 430 | return rc; |
1da177e4 LT |
431 | } |
432 | ||
3a9f462f | 433 | cFYI(1, ("inode = 0x%p file flags 0x%x for %s", |
fb8c4b14 | 434 | inode, file->f_flags, full_path)); |
1da177e4 LT |
435 | |
436 | if (oplockEnabled) | |
437 | oplock = REQ_OPLOCK; | |
438 | else | |
4b18f2a9 | 439 | oplock = 0; |
1da177e4 | 440 | |
7fc8f4e9 SF |
441 | if (tcon->unix_ext && (tcon->ses->capabilities & CAP_UNIX) && |
442 | (CIFS_UNIX_POSIX_PATH_OPS_CAP & | |
443 | le64_to_cpu(tcon->fsUnixInfo.Capability))) { | |
444 | int oflags = (int) cifs_posix_convert_flags(file->f_flags); | |
445 | /* can not refresh inode info since size could be stale */ | |
446 | rc = cifs_posix_open(full_path, NULL, inode->i_sb, | |
447 | cifs_sb->mnt_file_mode /* ignored */, | |
448 | oflags, &oplock, &netfid, xid); | |
449 | if (rc == 0) { | |
450 | cFYI(1, ("posix reopen succeeded")); | |
451 | goto reopen_success; | |
452 | } | |
453 | /* fallthrough to retry open the old way on errors, especially | |
454 | in the reconnect path it is important to retry hard */ | |
455 | } | |
456 | ||
457 | desiredAccess = cifs_convert_flags(file->f_flags); | |
458 | ||
1da177e4 | 459 | /* Can not refresh inode by passing in file_info buf to be returned |
fb8c4b14 SF |
460 | by SMBOpen and then calling get_inode_info with returned buf |
461 | since file might have write behind data that needs to be flushed | |
1da177e4 LT |
462 | and server version of file size can be stale. If we knew for sure |
463 | that inode was not dirty locally we could do this */ | |
464 | ||
7fc8f4e9 | 465 | rc = CIFSSMBOpen(xid, tcon, full_path, disposition, desiredAccess, |
1da177e4 | 466 | CREATE_NOT_DIR, &netfid, &oplock, NULL, |
fb8c4b14 | 467 | cifs_sb->local_nls, cifs_sb->mnt_cifs_flags & |
737b758c | 468 | CIFS_MOUNT_MAP_SPECIAL_CHR); |
1da177e4 LT |
469 | if (rc) { |
470 | up(&pCifsFile->fh_sem); | |
26a21b98 SF |
471 | cFYI(1, ("cifs_open returned 0x%x", rc)); |
472 | cFYI(1, ("oplock: %d", oplock)); | |
1da177e4 | 473 | } else { |
7fc8f4e9 | 474 | reopen_success: |
1da177e4 | 475 | pCifsFile->netfid = netfid; |
4b18f2a9 | 476 | pCifsFile->invalidHandle = false; |
1da177e4 LT |
477 | up(&pCifsFile->fh_sem); |
478 | pCifsInode = CIFS_I(inode); | |
479 | if (pCifsInode) { | |
480 | if (can_flush) { | |
cea21805 JL |
481 | rc = filemap_write_and_wait(inode->i_mapping); |
482 | if (rc != 0) | |
483 | CIFS_I(inode)->write_behind_rc = rc; | |
1da177e4 LT |
484 | /* temporarily disable caching while we |
485 | go to server to get inode info */ | |
4b18f2a9 SF |
486 | pCifsInode->clientCanCacheAll = false; |
487 | pCifsInode->clientCanCacheRead = false; | |
7fc8f4e9 | 488 | if (tcon->unix_ext) |
1da177e4 LT |
489 | rc = cifs_get_inode_info_unix(&inode, |
490 | full_path, inode->i_sb, xid); | |
491 | else | |
492 | rc = cifs_get_inode_info(&inode, | |
493 | full_path, NULL, inode->i_sb, | |
8b1327f6 | 494 | xid, NULL); |
1da177e4 LT |
495 | } /* else we are writing out data to server already |
496 | and could deadlock if we tried to flush data, and | |
497 | since we do not know if we have data that would | |
498 | invalidate the current end of file on the server | |
499 | we can not go to the server to get the new inod | |
500 | info */ | |
501 | if ((oplock & 0xF) == OPLOCK_EXCLUSIVE) { | |
4b18f2a9 SF |
502 | pCifsInode->clientCanCacheAll = true; |
503 | pCifsInode->clientCanCacheRead = true; | |
1da177e4 | 504 | cFYI(1, ("Exclusive Oplock granted on inode %p", |
e6a00296 | 505 | file->f_path.dentry->d_inode)); |
1da177e4 | 506 | } else if ((oplock & 0xF) == OPLOCK_READ) { |
4b18f2a9 SF |
507 | pCifsInode->clientCanCacheRead = true; |
508 | pCifsInode->clientCanCacheAll = false; | |
1da177e4 | 509 | } else { |
4b18f2a9 SF |
510 | pCifsInode->clientCanCacheRead = false; |
511 | pCifsInode->clientCanCacheAll = false; | |
1da177e4 LT |
512 | } |
513 | cifs_relock_file(pCifsFile); | |
514 | } | |
515 | } | |
1da177e4 LT |
516 | kfree(full_path); |
517 | FreeXid(xid); | |
518 | return rc; | |
519 | } | |
520 | ||
521 | int cifs_close(struct inode *inode, struct file *file) | |
522 | { | |
523 | int rc = 0; | |
15745320 | 524 | int xid, timeout; |
1da177e4 LT |
525 | struct cifs_sb_info *cifs_sb; |
526 | struct cifsTconInfo *pTcon; | |
527 | struct cifsFileInfo *pSMBFile = | |
528 | (struct cifsFileInfo *)file->private_data; | |
529 | ||
530 | xid = GetXid(); | |
531 | ||
532 | cifs_sb = CIFS_SB(inode->i_sb); | |
533 | pTcon = cifs_sb->tcon; | |
534 | if (pSMBFile) { | |
7ee1af76 | 535 | struct cifsLockInfo *li, *tmp; |
ddb4cbfc | 536 | write_lock(&GlobalSMBSeslock); |
4b18f2a9 | 537 | pSMBFile->closePend = true; |
1da177e4 LT |
538 | if (pTcon) { |
539 | /* no sense reconnecting to close a file that is | |
540 | already closed */ | |
3b795210 | 541 | if (!pTcon->need_reconnect) { |
ddb4cbfc | 542 | write_unlock(&GlobalSMBSeslock); |
15745320 | 543 | timeout = 2; |
fb8c4b14 | 544 | while ((atomic_read(&pSMBFile->wrtPending) != 0) |
15745320 | 545 | && (timeout <= 2048)) { |
23e7dd7d SF |
546 | /* Give write a better chance to get to |
547 | server ahead of the close. We do not | |
548 | want to add a wait_q here as it would | |
549 | increase the memory utilization as | |
550 | the struct would be in each open file, | |
fb8c4b14 | 551 | but this should give enough time to |
23e7dd7d | 552 | clear the socket */ |
90c81e0b SF |
553 | cFYI(DBG2, |
554 | ("close delay, write pending")); | |
23e7dd7d SF |
555 | msleep(timeout); |
556 | timeout *= 4; | |
4891d539 | 557 | } |
fb8c4b14 | 558 | if (atomic_read(&pSMBFile->wrtPending)) |
ddb4cbfc SF |
559 | cERROR(1, ("close with pending write")); |
560 | if (!pTcon->need_reconnect && | |
561 | !pSMBFile->invalidHandle) | |
562 | rc = CIFSSMBClose(xid, pTcon, | |
1da177e4 | 563 | pSMBFile->netfid); |
ddb4cbfc SF |
564 | } else |
565 | write_unlock(&GlobalSMBSeslock); | |
566 | } else | |
567 | write_unlock(&GlobalSMBSeslock); | |
7ee1af76 JA |
568 | |
569 | /* Delete any outstanding lock records. | |
570 | We'll lose them when the file is closed anyway. */ | |
796e5661 | 571 | mutex_lock(&pSMBFile->lock_mutex); |
7ee1af76 JA |
572 | list_for_each_entry_safe(li, tmp, &pSMBFile->llist, llist) { |
573 | list_del(&li->llist); | |
574 | kfree(li); | |
575 | } | |
796e5661 | 576 | mutex_unlock(&pSMBFile->lock_mutex); |
7ee1af76 | 577 | |
cbe0476f | 578 | write_lock(&GlobalSMBSeslock); |
1da177e4 LT |
579 | list_del(&pSMBFile->flist); |
580 | list_del(&pSMBFile->tlist); | |
cbe0476f | 581 | write_unlock(&GlobalSMBSeslock); |
15745320 SF |
582 | timeout = 10; |
583 | /* We waited above to give the SMBWrite a chance to issue | |
584 | on the wire (so we do not get SMBWrite returning EBADF | |
585 | if writepages is racing with close. Note that writepages | |
586 | does not specify a file handle, so it is possible for a file | |
587 | to be opened twice, and the application close the "wrong" | |
588 | file handle - in these cases we delay long enough to allow | |
589 | the SMBWrite to get on the wire before the SMB Close. | |
590 | We allow total wait here over 45 seconds, more than | |
591 | oplock break time, and more than enough to allow any write | |
592 | to complete on the server, or to time out on the client */ | |
593 | while ((atomic_read(&pSMBFile->wrtPending) != 0) | |
594 | && (timeout <= 50000)) { | |
595 | cERROR(1, ("writes pending, delay free of handle")); | |
596 | msleep(timeout); | |
597 | timeout *= 8; | |
598 | } | |
1da177e4 LT |
599 | kfree(file->private_data); |
600 | file->private_data = NULL; | |
601 | } else | |
602 | rc = -EBADF; | |
603 | ||
4efa53f0 | 604 | read_lock(&GlobalSMBSeslock); |
1da177e4 LT |
605 | if (list_empty(&(CIFS_I(inode)->openFileList))) { |
606 | cFYI(1, ("closing last open instance for inode %p", inode)); | |
607 | /* if the file is not open we do not know if we can cache info | |
608 | on this inode, much less write behind and read ahead */ | |
4b18f2a9 SF |
609 | CIFS_I(inode)->clientCanCacheRead = false; |
610 | CIFS_I(inode)->clientCanCacheAll = false; | |
1da177e4 | 611 | } |
4efa53f0 | 612 | read_unlock(&GlobalSMBSeslock); |
fb8c4b14 | 613 | if ((rc == 0) && CIFS_I(inode)->write_behind_rc) |
1da177e4 LT |
614 | rc = CIFS_I(inode)->write_behind_rc; |
615 | FreeXid(xid); | |
616 | return rc; | |
617 | } | |
618 | ||
619 | int cifs_closedir(struct inode *inode, struct file *file) | |
620 | { | |
621 | int rc = 0; | |
622 | int xid; | |
623 | struct cifsFileInfo *pCFileStruct = | |
624 | (struct cifsFileInfo *)file->private_data; | |
625 | char *ptmp; | |
626 | ||
26a21b98 | 627 | cFYI(1, ("Closedir inode = 0x%p", inode)); |
1da177e4 LT |
628 | |
629 | xid = GetXid(); | |
630 | ||
631 | if (pCFileStruct) { | |
632 | struct cifsTconInfo *pTcon; | |
fb8c4b14 SF |
633 | struct cifs_sb_info *cifs_sb = |
634 | CIFS_SB(file->f_path.dentry->d_sb); | |
1da177e4 LT |
635 | |
636 | pTcon = cifs_sb->tcon; | |
637 | ||
638 | cFYI(1, ("Freeing private data in close dir")); | |
ddb4cbfc | 639 | write_lock(&GlobalSMBSeslock); |
4b18f2a9 SF |
640 | if (!pCFileStruct->srch_inf.endOfSearch && |
641 | !pCFileStruct->invalidHandle) { | |
642 | pCFileStruct->invalidHandle = true; | |
ddb4cbfc | 643 | write_unlock(&GlobalSMBSeslock); |
1da177e4 LT |
644 | rc = CIFSFindClose(xid, pTcon, pCFileStruct->netfid); |
645 | cFYI(1, ("Closing uncompleted readdir with rc %d", | |
646 | rc)); | |
647 | /* not much we can do if it fails anyway, ignore rc */ | |
648 | rc = 0; | |
ddb4cbfc SF |
649 | } else |
650 | write_unlock(&GlobalSMBSeslock); | |
1da177e4 LT |
651 | ptmp = pCFileStruct->srch_inf.ntwrk_buf_start; |
652 | if (ptmp) { | |
ec637e3f | 653 | cFYI(1, ("closedir free smb buf in srch struct")); |
1da177e4 | 654 | pCFileStruct->srch_inf.ntwrk_buf_start = NULL; |
fb8c4b14 | 655 | if (pCFileStruct->srch_inf.smallBuf) |
d47d7c1a SF |
656 | cifs_small_buf_release(ptmp); |
657 | else | |
658 | cifs_buf_release(ptmp); | |
1da177e4 | 659 | } |
1da177e4 LT |
660 | kfree(file->private_data); |
661 | file->private_data = NULL; | |
662 | } | |
663 | /* BB can we lock the filestruct while this is going on? */ | |
664 | FreeXid(xid); | |
665 | return rc; | |
666 | } | |
667 | ||
7ee1af76 JA |
668 | static int store_file_lock(struct cifsFileInfo *fid, __u64 len, |
669 | __u64 offset, __u8 lockType) | |
670 | { | |
fb8c4b14 SF |
671 | struct cifsLockInfo *li = |
672 | kmalloc(sizeof(struct cifsLockInfo), GFP_KERNEL); | |
7ee1af76 JA |
673 | if (li == NULL) |
674 | return -ENOMEM; | |
675 | li->offset = offset; | |
676 | li->length = len; | |
677 | li->type = lockType; | |
796e5661 | 678 | mutex_lock(&fid->lock_mutex); |
7ee1af76 | 679 | list_add(&li->llist, &fid->llist); |
796e5661 | 680 | mutex_unlock(&fid->lock_mutex); |
7ee1af76 JA |
681 | return 0; |
682 | } | |
683 | ||
1da177e4 LT |
684 | int cifs_lock(struct file *file, int cmd, struct file_lock *pfLock) |
685 | { | |
686 | int rc, xid; | |
1da177e4 LT |
687 | __u32 numLock = 0; |
688 | __u32 numUnlock = 0; | |
689 | __u64 length; | |
4b18f2a9 | 690 | bool wait_flag = false; |
1da177e4 | 691 | struct cifs_sb_info *cifs_sb; |
13a6e42a | 692 | struct cifsTconInfo *tcon; |
08547b03 SF |
693 | __u16 netfid; |
694 | __u8 lockType = LOCKING_ANDX_LARGE_FILES; | |
13a6e42a | 695 | bool posix_locking = 0; |
1da177e4 LT |
696 | |
697 | length = 1 + pfLock->fl_end - pfLock->fl_start; | |
698 | rc = -EACCES; | |
699 | xid = GetXid(); | |
700 | ||
701 | cFYI(1, ("Lock parm: 0x%x flockflags: " | |
702 | "0x%x flocktype: 0x%x start: %lld end: %lld", | |
fb8c4b14 SF |
703 | cmd, pfLock->fl_flags, pfLock->fl_type, pfLock->fl_start, |
704 | pfLock->fl_end)); | |
1da177e4 LT |
705 | |
706 | if (pfLock->fl_flags & FL_POSIX) | |
d47d7c1a | 707 | cFYI(1, ("Posix")); |
1da177e4 | 708 | if (pfLock->fl_flags & FL_FLOCK) |
d47d7c1a | 709 | cFYI(1, ("Flock")); |
1da177e4 | 710 | if (pfLock->fl_flags & FL_SLEEP) { |
d47d7c1a | 711 | cFYI(1, ("Blocking lock")); |
4b18f2a9 | 712 | wait_flag = true; |
1da177e4 LT |
713 | } |
714 | if (pfLock->fl_flags & FL_ACCESS) | |
715 | cFYI(1, ("Process suspended by mandatory locking - " | |
26a21b98 | 716 | "not implemented yet")); |
1da177e4 LT |
717 | if (pfLock->fl_flags & FL_LEASE) |
718 | cFYI(1, ("Lease on file - not implemented yet")); | |
fb8c4b14 | 719 | if (pfLock->fl_flags & |
1da177e4 LT |
720 | (~(FL_POSIX | FL_FLOCK | FL_SLEEP | FL_ACCESS | FL_LEASE))) |
721 | cFYI(1, ("Unknown lock flags 0x%x", pfLock->fl_flags)); | |
722 | ||
723 | if (pfLock->fl_type == F_WRLCK) { | |
724 | cFYI(1, ("F_WRLCK ")); | |
725 | numLock = 1; | |
726 | } else if (pfLock->fl_type == F_UNLCK) { | |
d47d7c1a | 727 | cFYI(1, ("F_UNLCK")); |
1da177e4 | 728 | numUnlock = 1; |
d47d7c1a SF |
729 | /* Check if unlock includes more than |
730 | one lock range */ | |
1da177e4 | 731 | } else if (pfLock->fl_type == F_RDLCK) { |
d47d7c1a | 732 | cFYI(1, ("F_RDLCK")); |
1da177e4 LT |
733 | lockType |= LOCKING_ANDX_SHARED_LOCK; |
734 | numLock = 1; | |
735 | } else if (pfLock->fl_type == F_EXLCK) { | |
d47d7c1a | 736 | cFYI(1, ("F_EXLCK")); |
1da177e4 LT |
737 | numLock = 1; |
738 | } else if (pfLock->fl_type == F_SHLCK) { | |
d47d7c1a | 739 | cFYI(1, ("F_SHLCK")); |
1da177e4 LT |
740 | lockType |= LOCKING_ANDX_SHARED_LOCK; |
741 | numLock = 1; | |
742 | } else | |
d47d7c1a | 743 | cFYI(1, ("Unknown type of lock")); |
1da177e4 | 744 | |
e6a00296 | 745 | cifs_sb = CIFS_SB(file->f_path.dentry->d_sb); |
13a6e42a | 746 | tcon = cifs_sb->tcon; |
1da177e4 LT |
747 | |
748 | if (file->private_data == NULL) { | |
749 | FreeXid(xid); | |
750 | return -EBADF; | |
751 | } | |
08547b03 SF |
752 | netfid = ((struct cifsFileInfo *)file->private_data)->netfid; |
753 | ||
13a6e42a SF |
754 | if ((tcon->ses->capabilities & CAP_UNIX) && |
755 | (CIFS_UNIX_FCNTL_CAP & le64_to_cpu(tcon->fsUnixInfo.Capability)) && | |
acc18aa1 | 756 | ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NOPOSIXBRL) == 0)) |
13a6e42a | 757 | posix_locking = 1; |
08547b03 SF |
758 | /* BB add code here to normalize offset and length to |
759 | account for negative length which we can not accept over the | |
760 | wire */ | |
1da177e4 | 761 | if (IS_GETLK(cmd)) { |
fb8c4b14 | 762 | if (posix_locking) { |
08547b03 | 763 | int posix_lock_type; |
fb8c4b14 | 764 | if (lockType & LOCKING_ANDX_SHARED_LOCK) |
08547b03 SF |
765 | posix_lock_type = CIFS_RDLCK; |
766 | else | |
767 | posix_lock_type = CIFS_WRLCK; | |
13a6e42a | 768 | rc = CIFSSMBPosixLock(xid, tcon, netfid, 1 /* get */, |
fc94cdb9 | 769 | length, pfLock, |
08547b03 SF |
770 | posix_lock_type, wait_flag); |
771 | FreeXid(xid); | |
772 | return rc; | |
773 | } | |
774 | ||
775 | /* BB we could chain these into one lock request BB */ | |
13a6e42a | 776 | rc = CIFSSMBLock(xid, tcon, netfid, length, pfLock->fl_start, |
08547b03 | 777 | 0, 1, lockType, 0 /* wait flag */ ); |
1da177e4 | 778 | if (rc == 0) { |
13a6e42a | 779 | rc = CIFSSMBLock(xid, tcon, netfid, length, |
1da177e4 LT |
780 | pfLock->fl_start, 1 /* numUnlock */ , |
781 | 0 /* numLock */ , lockType, | |
782 | 0 /* wait flag */ ); | |
783 | pfLock->fl_type = F_UNLCK; | |
784 | if (rc != 0) | |
785 | cERROR(1, ("Error unlocking previously locked " | |
08547b03 | 786 | "range %d during test of lock", rc)); |
1da177e4 LT |
787 | rc = 0; |
788 | ||
789 | } else { | |
790 | /* if rc == ERR_SHARING_VIOLATION ? */ | |
791 | rc = 0; /* do not change lock type to unlock | |
792 | since range in use */ | |
793 | } | |
794 | ||
795 | FreeXid(xid); | |
796 | return rc; | |
797 | } | |
7ee1af76 JA |
798 | |
799 | if (!numLock && !numUnlock) { | |
800 | /* if no lock or unlock then nothing | |
801 | to do since we do not know what it is */ | |
802 | FreeXid(xid); | |
803 | return -EOPNOTSUPP; | |
804 | } | |
805 | ||
806 | if (posix_locking) { | |
08547b03 | 807 | int posix_lock_type; |
fb8c4b14 | 808 | if (lockType & LOCKING_ANDX_SHARED_LOCK) |
08547b03 SF |
809 | posix_lock_type = CIFS_RDLCK; |
810 | else | |
811 | posix_lock_type = CIFS_WRLCK; | |
50c2f753 | 812 | |
fb8c4b14 | 813 | if (numUnlock == 1) |
beb84dc8 | 814 | posix_lock_type = CIFS_UNLCK; |
7ee1af76 | 815 | |
13a6e42a | 816 | rc = CIFSSMBPosixLock(xid, tcon, netfid, 0 /* set */, |
fc94cdb9 | 817 | length, pfLock, |
08547b03 | 818 | posix_lock_type, wait_flag); |
7ee1af76 | 819 | } else { |
fb8c4b14 SF |
820 | struct cifsFileInfo *fid = |
821 | (struct cifsFileInfo *)file->private_data; | |
7ee1af76 JA |
822 | |
823 | if (numLock) { | |
13a6e42a | 824 | rc = CIFSSMBLock(xid, tcon, netfid, length, |
fb8c4b14 | 825 | pfLock->fl_start, |
7ee1af76 JA |
826 | 0, numLock, lockType, wait_flag); |
827 | ||
828 | if (rc == 0) { | |
829 | /* For Windows locks we must store them. */ | |
830 | rc = store_file_lock(fid, length, | |
831 | pfLock->fl_start, lockType); | |
832 | } | |
833 | } else if (numUnlock) { | |
834 | /* For each stored lock that this unlock overlaps | |
835 | completely, unlock it. */ | |
836 | int stored_rc = 0; | |
837 | struct cifsLockInfo *li, *tmp; | |
838 | ||
6b70c955 | 839 | rc = 0; |
796e5661 | 840 | mutex_lock(&fid->lock_mutex); |
7ee1af76 JA |
841 | list_for_each_entry_safe(li, tmp, &fid->llist, llist) { |
842 | if (pfLock->fl_start <= li->offset && | |
c19eb710 | 843 | (pfLock->fl_start + length) >= |
39db810c | 844 | (li->offset + li->length)) { |
13a6e42a | 845 | stored_rc = CIFSSMBLock(xid, tcon, |
fb8c4b14 | 846 | netfid, |
7ee1af76 | 847 | li->length, li->offset, |
4b18f2a9 | 848 | 1, 0, li->type, false); |
7ee1af76 JA |
849 | if (stored_rc) |
850 | rc = stored_rc; | |
851 | ||
852 | list_del(&li->llist); | |
853 | kfree(li); | |
854 | } | |
855 | } | |
796e5661 | 856 | mutex_unlock(&fid->lock_mutex); |
7ee1af76 JA |
857 | } |
858 | } | |
859 | ||
d634cc15 | 860 | if (pfLock->fl_flags & FL_POSIX) |
1da177e4 LT |
861 | posix_lock_file_wait(file, pfLock); |
862 | FreeXid(xid); | |
863 | return rc; | |
864 | } | |
865 | ||
866 | ssize_t cifs_user_write(struct file *file, const char __user *write_data, | |
867 | size_t write_size, loff_t *poffset) | |
868 | { | |
869 | int rc = 0; | |
870 | unsigned int bytes_written = 0; | |
871 | unsigned int total_written; | |
872 | struct cifs_sb_info *cifs_sb; | |
873 | struct cifsTconInfo *pTcon; | |
874 | int xid, long_op; | |
875 | struct cifsFileInfo *open_file; | |
876 | ||
e6a00296 | 877 | cifs_sb = CIFS_SB(file->f_path.dentry->d_sb); |
1da177e4 LT |
878 | |
879 | pTcon = cifs_sb->tcon; | |
880 | ||
881 | /* cFYI(1, | |
882 | (" write %d bytes to offset %lld of %s", write_size, | |
e6a00296 | 883 | *poffset, file->f_path.dentry->d_name.name)); */ |
1da177e4 LT |
884 | |
885 | if (file->private_data == NULL) | |
886 | return -EBADF; | |
c33f8d32 | 887 | open_file = (struct cifsFileInfo *) file->private_data; |
50c2f753 | 888 | |
838726c4 JL |
889 | rc = generic_write_checks(file, poffset, &write_size, 0); |
890 | if (rc) | |
891 | return rc; | |
892 | ||
1da177e4 | 893 | xid = GetXid(); |
1da177e4 | 894 | |
e6a00296 | 895 | if (*poffset > file->f_path.dentry->d_inode->i_size) |
133672ef | 896 | long_op = CIFS_VLONG_OP; /* writes past EOF take long time */ |
1da177e4 | 897 | else |
133672ef | 898 | long_op = CIFS_LONG_OP; |
1da177e4 LT |
899 | |
900 | for (total_written = 0; write_size > total_written; | |
901 | total_written += bytes_written) { | |
902 | rc = -EAGAIN; | |
903 | while (rc == -EAGAIN) { | |
904 | if (file->private_data == NULL) { | |
905 | /* file has been closed on us */ | |
906 | FreeXid(xid); | |
907 | /* if we have gotten here we have written some data | |
908 | and blocked, and the file has been freed on us while | |
909 | we blocked so return what we managed to write */ | |
910 | return total_written; | |
fb8c4b14 | 911 | } |
1da177e4 LT |
912 | if (open_file->closePend) { |
913 | FreeXid(xid); | |
914 | if (total_written) | |
915 | return total_written; | |
916 | else | |
917 | return -EBADF; | |
918 | } | |
919 | if (open_file->invalidHandle) { | |
1da177e4 LT |
920 | /* we could deadlock if we called |
921 | filemap_fdatawait from here so tell | |
922 | reopen_file not to flush data to server | |
923 | now */ | |
4b18f2a9 | 924 | rc = cifs_reopen_file(file, false); |
1da177e4 LT |
925 | if (rc != 0) |
926 | break; | |
927 | } | |
928 | ||
929 | rc = CIFSSMBWrite(xid, pTcon, | |
930 | open_file->netfid, | |
931 | min_t(const int, cifs_sb->wsize, | |
932 | write_size - total_written), | |
933 | *poffset, &bytes_written, | |
934 | NULL, write_data + total_written, long_op); | |
935 | } | |
936 | if (rc || (bytes_written == 0)) { | |
937 | if (total_written) | |
938 | break; | |
939 | else { | |
940 | FreeXid(xid); | |
941 | return rc; | |
942 | } | |
943 | } else | |
944 | *poffset += bytes_written; | |
133672ef | 945 | long_op = CIFS_STD_OP; /* subsequent writes fast - |
1da177e4 LT |
946 | 15 seconds is plenty */ |
947 | } | |
948 | ||
a4544347 | 949 | cifs_stats_bytes_written(pTcon, total_written); |
1da177e4 LT |
950 | |
951 | /* since the write may have blocked check these pointers again */ | |
3677db10 SF |
952 | if ((file->f_path.dentry) && (file->f_path.dentry->d_inode)) { |
953 | struct inode *inode = file->f_path.dentry->d_inode; | |
fb8c4b14 SF |
954 | /* Do not update local mtime - server will set its actual value on write |
955 | * inode->i_ctime = inode->i_mtime = | |
3677db10 SF |
956 | * current_fs_time(inode->i_sb);*/ |
957 | if (total_written > 0) { | |
958 | spin_lock(&inode->i_lock); | |
959 | if (*poffset > file->f_path.dentry->d_inode->i_size) | |
960 | i_size_write(file->f_path.dentry->d_inode, | |
1da177e4 | 961 | *poffset); |
3677db10 | 962 | spin_unlock(&inode->i_lock); |
1da177e4 | 963 | } |
fb8c4b14 | 964 | mark_inode_dirty_sync(file->f_path.dentry->d_inode); |
1da177e4 LT |
965 | } |
966 | FreeXid(xid); | |
967 | return total_written; | |
968 | } | |
969 | ||
970 | static ssize_t cifs_write(struct file *file, const char *write_data, | |
d9414774 | 971 | size_t write_size, loff_t *poffset) |
1da177e4 LT |
972 | { |
973 | int rc = 0; | |
974 | unsigned int bytes_written = 0; | |
975 | unsigned int total_written; | |
976 | struct cifs_sb_info *cifs_sb; | |
977 | struct cifsTconInfo *pTcon; | |
978 | int xid, long_op; | |
979 | struct cifsFileInfo *open_file; | |
980 | ||
e6a00296 | 981 | cifs_sb = CIFS_SB(file->f_path.dentry->d_sb); |
1da177e4 LT |
982 | |
983 | pTcon = cifs_sb->tcon; | |
984 | ||
fb8c4b14 | 985 | cFYI(1, ("write %zd bytes to offset %lld of %s", write_size, |
e6a00296 | 986 | *poffset, file->f_path.dentry->d_name.name)); |
1da177e4 LT |
987 | |
988 | if (file->private_data == NULL) | |
989 | return -EBADF; | |
c33f8d32 | 990 | open_file = (struct cifsFileInfo *)file->private_data; |
50c2f753 | 991 | |
1da177e4 | 992 | xid = GetXid(); |
1da177e4 | 993 | |
e6a00296 | 994 | if (*poffset > file->f_path.dentry->d_inode->i_size) |
133672ef | 995 | long_op = CIFS_VLONG_OP; /* writes past EOF can be slow */ |
1da177e4 | 996 | else |
133672ef | 997 | long_op = CIFS_LONG_OP; |
1da177e4 LT |
998 | |
999 | for (total_written = 0; write_size > total_written; | |
1000 | total_written += bytes_written) { | |
1001 | rc = -EAGAIN; | |
1002 | while (rc == -EAGAIN) { | |
1003 | if (file->private_data == NULL) { | |
1004 | /* file has been closed on us */ | |
1005 | FreeXid(xid); | |
1006 | /* if we have gotten here we have written some data | |
1007 | and blocked, and the file has been freed on us | |
fb8c4b14 | 1008 | while we blocked so return what we managed to |
1da177e4 LT |
1009 | write */ |
1010 | return total_written; | |
fb8c4b14 | 1011 | } |
1da177e4 LT |
1012 | if (open_file->closePend) { |
1013 | FreeXid(xid); | |
1014 | if (total_written) | |
1015 | return total_written; | |
1016 | else | |
1017 | return -EBADF; | |
1018 | } | |
1019 | if (open_file->invalidHandle) { | |
1da177e4 LT |
1020 | /* we could deadlock if we called |
1021 | filemap_fdatawait from here so tell | |
fb8c4b14 | 1022 | reopen_file not to flush data to |
1da177e4 | 1023 | server now */ |
4b18f2a9 | 1024 | rc = cifs_reopen_file(file, false); |
1da177e4 LT |
1025 | if (rc != 0) |
1026 | break; | |
1027 | } | |
fb8c4b14 SF |
1028 | if (experimEnabled || (pTcon->ses->server && |
1029 | ((pTcon->ses->server->secMode & | |
08775834 | 1030 | (SECMODE_SIGN_REQUIRED | SECMODE_SIGN_ENABLED)) |
c01f36a8 | 1031 | == 0))) { |
3e84469d SF |
1032 | struct kvec iov[2]; |
1033 | unsigned int len; | |
1034 | ||
0ae0efad | 1035 | len = min((size_t)cifs_sb->wsize, |
3e84469d SF |
1036 | write_size - total_written); |
1037 | /* iov[0] is reserved for smb header */ | |
1038 | iov[1].iov_base = (char *)write_data + | |
1039 | total_written; | |
1040 | iov[1].iov_len = len; | |
d6e04ae6 | 1041 | rc = CIFSSMBWrite2(xid, pTcon, |
3e84469d | 1042 | open_file->netfid, len, |
d6e04ae6 | 1043 | *poffset, &bytes_written, |
3e84469d | 1044 | iov, 1, long_op); |
d6e04ae6 | 1045 | } else |
60808233 SF |
1046 | rc = CIFSSMBWrite(xid, pTcon, |
1047 | open_file->netfid, | |
1048 | min_t(const int, cifs_sb->wsize, | |
1049 | write_size - total_written), | |
1050 | *poffset, &bytes_written, | |
1051 | write_data + total_written, | |
1052 | NULL, long_op); | |
1da177e4 LT |
1053 | } |
1054 | if (rc || (bytes_written == 0)) { | |
1055 | if (total_written) | |
1056 | break; | |
1057 | else { | |
1058 | FreeXid(xid); | |
1059 | return rc; | |
1060 | } | |
1061 | } else | |
1062 | *poffset += bytes_written; | |
133672ef | 1063 | long_op = CIFS_STD_OP; /* subsequent writes fast - |
1da177e4 LT |
1064 | 15 seconds is plenty */ |
1065 | } | |
1066 | ||
a4544347 | 1067 | cifs_stats_bytes_written(pTcon, total_written); |
1da177e4 LT |
1068 | |
1069 | /* since the write may have blocked check these pointers again */ | |
3677db10 | 1070 | if ((file->f_path.dentry) && (file->f_path.dentry->d_inode)) { |
004c46b9 | 1071 | /*BB We could make this contingent on superblock ATIME flag too */ |
3677db10 SF |
1072 | /* file->f_path.dentry->d_inode->i_ctime = |
1073 | file->f_path.dentry->d_inode->i_mtime = CURRENT_TIME;*/ | |
1074 | if (total_written > 0) { | |
1075 | spin_lock(&file->f_path.dentry->d_inode->i_lock); | |
1076 | if (*poffset > file->f_path.dentry->d_inode->i_size) | |
1077 | i_size_write(file->f_path.dentry->d_inode, | |
1078 | *poffset); | |
1079 | spin_unlock(&file->f_path.dentry->d_inode->i_lock); | |
1da177e4 | 1080 | } |
3677db10 | 1081 | mark_inode_dirty_sync(file->f_path.dentry->d_inode); |
1da177e4 LT |
1082 | } |
1083 | FreeXid(xid); | |
1084 | return total_written; | |
1085 | } | |
1086 | ||
630f3f0c SF |
1087 | #ifdef CONFIG_CIFS_EXPERIMENTAL |
1088 | struct cifsFileInfo *find_readable_file(struct cifsInodeInfo *cifs_inode) | |
1089 | { | |
1090 | struct cifsFileInfo *open_file = NULL; | |
1091 | ||
1092 | read_lock(&GlobalSMBSeslock); | |
1093 | /* we could simply get the first_list_entry since write-only entries | |
1094 | are always at the end of the list but since the first entry might | |
1095 | have a close pending, we go through the whole list */ | |
1096 | list_for_each_entry(open_file, &cifs_inode->openFileList, flist) { | |
1097 | if (open_file->closePend) | |
1098 | continue; | |
1099 | if (open_file->pfile && ((open_file->pfile->f_flags & O_RDWR) || | |
1100 | (open_file->pfile->f_flags & O_RDONLY))) { | |
1101 | if (!open_file->invalidHandle) { | |
1102 | /* found a good file */ | |
1103 | /* lock it so it will not be closed on us */ | |
1104 | atomic_inc(&open_file->wrtPending); | |
1105 | read_unlock(&GlobalSMBSeslock); | |
1106 | return open_file; | |
1107 | } /* else might as well continue, and look for | |
1108 | another, or simply have the caller reopen it | |
1109 | again rather than trying to fix this handle */ | |
1110 | } else /* write only file */ | |
1111 | break; /* write only files are last so must be done */ | |
1112 | } | |
1113 | read_unlock(&GlobalSMBSeslock); | |
1114 | return NULL; | |
1115 | } | |
1116 | #endif | |
1117 | ||
dd99cd80 | 1118 | struct cifsFileInfo *find_writable_file(struct cifsInodeInfo *cifs_inode) |
6148a742 SF |
1119 | { |
1120 | struct cifsFileInfo *open_file; | |
2846d386 | 1121 | bool any_available = false; |
dd99cd80 | 1122 | int rc; |
6148a742 | 1123 | |
60808233 SF |
1124 | /* Having a null inode here (because mapping->host was set to zero by |
1125 | the VFS or MM) should not happen but we had reports of on oops (due to | |
1126 | it being zero) during stress testcases so we need to check for it */ | |
1127 | ||
fb8c4b14 SF |
1128 | if (cifs_inode == NULL) { |
1129 | cERROR(1, ("Null inode passed to cifs_writeable_file")); | |
60808233 SF |
1130 | dump_stack(); |
1131 | return NULL; | |
1132 | } | |
1133 | ||
6148a742 | 1134 | read_lock(&GlobalSMBSeslock); |
9b22b0b7 | 1135 | refind_writable: |
6148a742 | 1136 | list_for_each_entry(open_file, &cifs_inode->openFileList, flist) { |
2846d386 JL |
1137 | if (open_file->closePend || |
1138 | (!any_available && open_file->pid != current->tgid)) | |
6148a742 | 1139 | continue; |
2846d386 | 1140 | |
6148a742 SF |
1141 | if (open_file->pfile && |
1142 | ((open_file->pfile->f_flags & O_RDWR) || | |
1143 | (open_file->pfile->f_flags & O_WRONLY))) { | |
23e7dd7d | 1144 | atomic_inc(&open_file->wrtPending); |
9b22b0b7 SF |
1145 | |
1146 | if (!open_file->invalidHandle) { | |
1147 | /* found a good writable file */ | |
1148 | read_unlock(&GlobalSMBSeslock); | |
1149 | return open_file; | |
1150 | } | |
8840dee9 | 1151 | |
6148a742 | 1152 | read_unlock(&GlobalSMBSeslock); |
9b22b0b7 | 1153 | /* Had to unlock since following call can block */ |
4b18f2a9 | 1154 | rc = cifs_reopen_file(open_file->pfile, false); |
8840dee9 | 1155 | if (!rc) { |
9b22b0b7 SF |
1156 | if (!open_file->closePend) |
1157 | return open_file; | |
1158 | else { /* start over in case this was deleted */ | |
1159 | /* since the list could be modified */ | |
37c0eb46 | 1160 | read_lock(&GlobalSMBSeslock); |
15745320 | 1161 | atomic_dec(&open_file->wrtPending); |
9b22b0b7 | 1162 | goto refind_writable; |
37c0eb46 SF |
1163 | } |
1164 | } | |
9b22b0b7 SF |
1165 | |
1166 | /* if it fails, try another handle if possible - | |
1167 | (we can not do this if closePending since | |
1168 | loop could be modified - in which case we | |
1169 | have to start at the beginning of the list | |
1170 | again. Note that it would be bad | |
1171 | to hold up writepages here (rather than | |
1172 | in caller) with continuous retries */ | |
1173 | cFYI(1, ("wp failed on reopen file")); | |
1174 | read_lock(&GlobalSMBSeslock); | |
1175 | /* can not use this handle, no write | |
1176 | pending on this one after all */ | |
1177 | atomic_dec(&open_file->wrtPending); | |
8840dee9 | 1178 | |
9b22b0b7 SF |
1179 | if (open_file->closePend) /* list could have changed */ |
1180 | goto refind_writable; | |
1181 | /* else we simply continue to the next entry. Thus | |
1182 | we do not loop on reopen errors. If we | |
1183 | can not reopen the file, for example if we | |
1184 | reconnected to a server with another client | |
1185 | racing to delete or lock the file we would not | |
1186 | make progress if we restarted before the beginning | |
1187 | of the loop here. */ | |
6148a742 SF |
1188 | } |
1189 | } | |
2846d386 JL |
1190 | /* couldn't find useable FH with same pid, try any available */ |
1191 | if (!any_available) { | |
1192 | any_available = true; | |
1193 | goto refind_writable; | |
1194 | } | |
6148a742 SF |
1195 | read_unlock(&GlobalSMBSeslock); |
1196 | return NULL; | |
1197 | } | |
1198 | ||
1da177e4 LT |
1199 | static int cifs_partialpagewrite(struct page *page, unsigned from, unsigned to) |
1200 | { | |
1201 | struct address_space *mapping = page->mapping; | |
1202 | loff_t offset = (loff_t)page->index << PAGE_CACHE_SHIFT; | |
1203 | char *write_data; | |
1204 | int rc = -EFAULT; | |
1205 | int bytes_written = 0; | |
1206 | struct cifs_sb_info *cifs_sb; | |
1207 | struct cifsTconInfo *pTcon; | |
1208 | struct inode *inode; | |
6148a742 | 1209 | struct cifsFileInfo *open_file; |
1da177e4 LT |
1210 | |
1211 | if (!mapping || !mapping->host) | |
1212 | return -EFAULT; | |
1213 | ||
1214 | inode = page->mapping->host; | |
1215 | cifs_sb = CIFS_SB(inode->i_sb); | |
1216 | pTcon = cifs_sb->tcon; | |
1217 | ||
1218 | offset += (loff_t)from; | |
1219 | write_data = kmap(page); | |
1220 | write_data += from; | |
1221 | ||
1222 | if ((to > PAGE_CACHE_SIZE) || (from > to)) { | |
1223 | kunmap(page); | |
1224 | return -EIO; | |
1225 | } | |
1226 | ||
1227 | /* racing with truncate? */ | |
1228 | if (offset > mapping->host->i_size) { | |
1229 | kunmap(page); | |
1230 | return 0; /* don't care */ | |
1231 | } | |
1232 | ||
1233 | /* check to make sure that we are not extending the file */ | |
1234 | if (mapping->host->i_size - offset < (loff_t)to) | |
fb8c4b14 | 1235 | to = (unsigned)(mapping->host->i_size - offset); |
1da177e4 | 1236 | |
6148a742 SF |
1237 | open_file = find_writable_file(CIFS_I(mapping->host)); |
1238 | if (open_file) { | |
1239 | bytes_written = cifs_write(open_file->pfile, write_data, | |
1240 | to-from, &offset); | |
23e7dd7d | 1241 | atomic_dec(&open_file->wrtPending); |
1da177e4 | 1242 | /* Does mm or vfs already set times? */ |
6148a742 | 1243 | inode->i_atime = inode->i_mtime = current_fs_time(inode->i_sb); |
bb5a9a04 | 1244 | if ((bytes_written > 0) && (offset)) |
6148a742 | 1245 | rc = 0; |
bb5a9a04 SF |
1246 | else if (bytes_written < 0) |
1247 | rc = bytes_written; | |
6148a742 | 1248 | } else { |
1da177e4 LT |
1249 | cFYI(1, ("No writeable filehandles for inode")); |
1250 | rc = -EIO; | |
1251 | } | |
1252 | ||
1253 | kunmap(page); | |
1254 | return rc; | |
1255 | } | |
1256 | ||
1da177e4 | 1257 | static int cifs_writepages(struct address_space *mapping, |
37c0eb46 | 1258 | struct writeback_control *wbc) |
1da177e4 | 1259 | { |
37c0eb46 SF |
1260 | struct backing_dev_info *bdi = mapping->backing_dev_info; |
1261 | unsigned int bytes_to_write; | |
1262 | unsigned int bytes_written; | |
1263 | struct cifs_sb_info *cifs_sb; | |
1264 | int done = 0; | |
111ebb6e | 1265 | pgoff_t end; |
37c0eb46 | 1266 | pgoff_t index; |
fb8c4b14 SF |
1267 | int range_whole = 0; |
1268 | struct kvec *iov; | |
84d2f07e | 1269 | int len; |
37c0eb46 SF |
1270 | int n_iov = 0; |
1271 | pgoff_t next; | |
1272 | int nr_pages; | |
1273 | __u64 offset = 0; | |
23e7dd7d | 1274 | struct cifsFileInfo *open_file; |
37c0eb46 SF |
1275 | struct page *page; |
1276 | struct pagevec pvec; | |
1277 | int rc = 0; | |
1278 | int scanned = 0; | |
1da177e4 LT |
1279 | int xid; |
1280 | ||
37c0eb46 | 1281 | cifs_sb = CIFS_SB(mapping->host->i_sb); |
50c2f753 | 1282 | |
37c0eb46 SF |
1283 | /* |
1284 | * If wsize is smaller that the page cache size, default to writing | |
1285 | * one page at a time via cifs_writepage | |
1286 | */ | |
1287 | if (cifs_sb->wsize < PAGE_CACHE_SIZE) | |
1288 | return generic_writepages(mapping, wbc); | |
1289 | ||
fb8c4b14 SF |
1290 | if ((cifs_sb->tcon->ses) && (cifs_sb->tcon->ses->server)) |
1291 | if (cifs_sb->tcon->ses->server->secMode & | |
1292 | (SECMODE_SIGN_REQUIRED | SECMODE_SIGN_ENABLED)) | |
1293 | if (!experimEnabled) | |
60808233 | 1294 | return generic_writepages(mapping, wbc); |
4a77118c | 1295 | |
9a0c8230 | 1296 | iov = kmalloc(32 * sizeof(struct kvec), GFP_KERNEL); |
fb8c4b14 | 1297 | if (iov == NULL) |
9a0c8230 SF |
1298 | return generic_writepages(mapping, wbc); |
1299 | ||
1300 | ||
37c0eb46 SF |
1301 | /* |
1302 | * BB: Is this meaningful for a non-block-device file system? | |
1303 | * If it is, we should test it again after we do I/O | |
1304 | */ | |
1305 | if (wbc->nonblocking && bdi_write_congested(bdi)) { | |
1306 | wbc->encountered_congestion = 1; | |
9a0c8230 | 1307 | kfree(iov); |
37c0eb46 SF |
1308 | return 0; |
1309 | } | |
1310 | ||
1da177e4 LT |
1311 | xid = GetXid(); |
1312 | ||
37c0eb46 | 1313 | pagevec_init(&pvec, 0); |
111ebb6e | 1314 | if (wbc->range_cyclic) { |
37c0eb46 | 1315 | index = mapping->writeback_index; /* Start from prev offset */ |
111ebb6e OH |
1316 | end = -1; |
1317 | } else { | |
1318 | index = wbc->range_start >> PAGE_CACHE_SHIFT; | |
1319 | end = wbc->range_end >> PAGE_CACHE_SHIFT; | |
1320 | if (wbc->range_start == 0 && wbc->range_end == LLONG_MAX) | |
1321 | range_whole = 1; | |
37c0eb46 SF |
1322 | scanned = 1; |
1323 | } | |
1324 | retry: | |
1325 | while (!done && (index <= end) && | |
1326 | (nr_pages = pagevec_lookup_tag(&pvec, mapping, &index, | |
1327 | PAGECACHE_TAG_DIRTY, | |
1328 | min(end - index, (pgoff_t)PAGEVEC_SIZE - 1) + 1))) { | |
1329 | int first; | |
1330 | unsigned int i; | |
1331 | ||
37c0eb46 SF |
1332 | first = -1; |
1333 | next = 0; | |
1334 | n_iov = 0; | |
1335 | bytes_to_write = 0; | |
1336 | ||
1337 | for (i = 0; i < nr_pages; i++) { | |
1338 | page = pvec.pages[i]; | |
1339 | /* | |
1340 | * At this point we hold neither mapping->tree_lock nor | |
1341 | * lock on the page itself: the page may be truncated or | |
1342 | * invalidated (changing page->mapping to NULL), or even | |
1343 | * swizzled back from swapper_space to tmpfs file | |
1344 | * mapping | |
1345 | */ | |
1346 | ||
1347 | if (first < 0) | |
1348 | lock_page(page); | |
529ae9aa | 1349 | else if (!trylock_page(page)) |
37c0eb46 SF |
1350 | break; |
1351 | ||
1352 | if (unlikely(page->mapping != mapping)) { | |
1353 | unlock_page(page); | |
1354 | break; | |
1355 | } | |
1356 | ||
111ebb6e | 1357 | if (!wbc->range_cyclic && page->index > end) { |
37c0eb46 SF |
1358 | done = 1; |
1359 | unlock_page(page); | |
1360 | break; | |
1361 | } | |
1362 | ||
1363 | if (next && (page->index != next)) { | |
1364 | /* Not next consecutive page */ | |
1365 | unlock_page(page); | |
1366 | break; | |
1367 | } | |
1368 | ||
1369 | if (wbc->sync_mode != WB_SYNC_NONE) | |
1370 | wait_on_page_writeback(page); | |
1371 | ||
1372 | if (PageWriteback(page) || | |
cb876f45 | 1373 | !clear_page_dirty_for_io(page)) { |
37c0eb46 SF |
1374 | unlock_page(page); |
1375 | break; | |
1376 | } | |
84d2f07e | 1377 | |
cb876f45 LT |
1378 | /* |
1379 | * This actually clears the dirty bit in the radix tree. | |
1380 | * See cifs_writepage() for more commentary. | |
1381 | */ | |
1382 | set_page_writeback(page); | |
1383 | ||
84d2f07e SF |
1384 | if (page_offset(page) >= mapping->host->i_size) { |
1385 | done = 1; | |
1386 | unlock_page(page); | |
cb876f45 | 1387 | end_page_writeback(page); |
84d2f07e SF |
1388 | break; |
1389 | } | |
1390 | ||
37c0eb46 SF |
1391 | /* |
1392 | * BB can we get rid of this? pages are held by pvec | |
1393 | */ | |
1394 | page_cache_get(page); | |
1395 | ||
84d2f07e SF |
1396 | len = min(mapping->host->i_size - page_offset(page), |
1397 | (loff_t)PAGE_CACHE_SIZE); | |
1398 | ||
37c0eb46 SF |
1399 | /* reserve iov[0] for the smb header */ |
1400 | n_iov++; | |
1401 | iov[n_iov].iov_base = kmap(page); | |
84d2f07e SF |
1402 | iov[n_iov].iov_len = len; |
1403 | bytes_to_write += len; | |
37c0eb46 SF |
1404 | |
1405 | if (first < 0) { | |
1406 | first = i; | |
1407 | offset = page_offset(page); | |
1408 | } | |
1409 | next = page->index + 1; | |
1410 | if (bytes_to_write + PAGE_CACHE_SIZE > cifs_sb->wsize) | |
1411 | break; | |
1412 | } | |
1413 | if (n_iov) { | |
23e7dd7d SF |
1414 | /* Search for a writable handle every time we call |
1415 | * CIFSSMBWrite2. We can't rely on the last handle | |
1416 | * we used to still be valid | |
1417 | */ | |
1418 | open_file = find_writable_file(CIFS_I(mapping->host)); | |
1419 | if (!open_file) { | |
1420 | cERROR(1, ("No writable handles for inode")); | |
1421 | rc = -EBADF; | |
1047abc1 | 1422 | } else { |
23e7dd7d SF |
1423 | rc = CIFSSMBWrite2(xid, cifs_sb->tcon, |
1424 | open_file->netfid, | |
1425 | bytes_to_write, offset, | |
1426 | &bytes_written, iov, n_iov, | |
133672ef | 1427 | CIFS_LONG_OP); |
23e7dd7d SF |
1428 | atomic_dec(&open_file->wrtPending); |
1429 | if (rc || bytes_written < bytes_to_write) { | |
63135e08 | 1430 | cERROR(1, ("Write2 ret %d, wrote %d", |
23e7dd7d SF |
1431 | rc, bytes_written)); |
1432 | /* BB what if continued retry is | |
1433 | requested via mount flags? */ | |
cea21805 JL |
1434 | if (rc == -ENOSPC) |
1435 | set_bit(AS_ENOSPC, &mapping->flags); | |
1436 | else | |
1437 | set_bit(AS_EIO, &mapping->flags); | |
23e7dd7d SF |
1438 | } else { |
1439 | cifs_stats_bytes_written(cifs_sb->tcon, | |
1440 | bytes_written); | |
1441 | } | |
37c0eb46 SF |
1442 | } |
1443 | for (i = 0; i < n_iov; i++) { | |
1444 | page = pvec.pages[first + i]; | |
eb9bdaa3 SF |
1445 | /* Should we also set page error on |
1446 | success rc but too little data written? */ | |
1447 | /* BB investigate retry logic on temporary | |
1448 | server crash cases and how recovery works | |
fb8c4b14 SF |
1449 | when page marked as error */ |
1450 | if (rc) | |
eb9bdaa3 | 1451 | SetPageError(page); |
37c0eb46 SF |
1452 | kunmap(page); |
1453 | unlock_page(page); | |
cb876f45 | 1454 | end_page_writeback(page); |
37c0eb46 SF |
1455 | page_cache_release(page); |
1456 | } | |
1457 | if ((wbc->nr_to_write -= n_iov) <= 0) | |
1458 | done = 1; | |
1459 | index = next; | |
b066a48c DK |
1460 | } else |
1461 | /* Need to re-find the pages we skipped */ | |
1462 | index = pvec.pages[0]->index + 1; | |
1463 | ||
37c0eb46 SF |
1464 | pagevec_release(&pvec); |
1465 | } | |
1466 | if (!scanned && !done) { | |
1467 | /* | |
1468 | * We hit the last page and there is more work to be done: wrap | |
1469 | * back to the start of the file | |
1470 | */ | |
1471 | scanned = 1; | |
1472 | index = 0; | |
1473 | goto retry; | |
1474 | } | |
111ebb6e | 1475 | if (wbc->range_cyclic || (range_whole && wbc->nr_to_write > 0)) |
37c0eb46 SF |
1476 | mapping->writeback_index = index; |
1477 | ||
1da177e4 | 1478 | FreeXid(xid); |
9a0c8230 | 1479 | kfree(iov); |
1da177e4 LT |
1480 | return rc; |
1481 | } | |
1da177e4 | 1482 | |
fb8c4b14 | 1483 | static int cifs_writepage(struct page *page, struct writeback_control *wbc) |
1da177e4 LT |
1484 | { |
1485 | int rc = -EFAULT; | |
1486 | int xid; | |
1487 | ||
1488 | xid = GetXid(); | |
1489 | /* BB add check for wbc flags */ | |
1490 | page_cache_get(page); | |
ad7a2926 | 1491 | if (!PageUptodate(page)) |
1da177e4 | 1492 | cFYI(1, ("ppw - page not up to date")); |
cb876f45 LT |
1493 | |
1494 | /* | |
1495 | * Set the "writeback" flag, and clear "dirty" in the radix tree. | |
1496 | * | |
1497 | * A writepage() implementation always needs to do either this, | |
1498 | * or re-dirty the page with "redirty_page_for_writepage()" in | |
1499 | * the case of a failure. | |
1500 | * | |
1501 | * Just unlocking the page will cause the radix tree tag-bits | |
1502 | * to fail to update with the state of the page correctly. | |
1503 | */ | |
fb8c4b14 | 1504 | set_page_writeback(page); |
1da177e4 LT |
1505 | rc = cifs_partialpagewrite(page, 0, PAGE_CACHE_SIZE); |
1506 | SetPageUptodate(page); /* BB add check for error and Clearuptodate? */ | |
1507 | unlock_page(page); | |
cb876f45 LT |
1508 | end_page_writeback(page); |
1509 | page_cache_release(page); | |
1da177e4 LT |
1510 | FreeXid(xid); |
1511 | return rc; | |
1512 | } | |
1513 | ||
d9414774 NP |
1514 | static int cifs_write_end(struct file *file, struct address_space *mapping, |
1515 | loff_t pos, unsigned len, unsigned copied, | |
1516 | struct page *page, void *fsdata) | |
1da177e4 | 1517 | { |
d9414774 NP |
1518 | int rc; |
1519 | struct inode *inode = mapping->host; | |
1da177e4 | 1520 | |
d9414774 NP |
1521 | cFYI(1, ("write_end for page %p from pos %lld with %d bytes", |
1522 | page, pos, copied)); | |
1523 | ||
a98ee8c1 JL |
1524 | if (PageChecked(page)) { |
1525 | if (copied == len) | |
1526 | SetPageUptodate(page); | |
1527 | ClearPageChecked(page); | |
1528 | } else if (!PageUptodate(page) && copied == PAGE_CACHE_SIZE) | |
d9414774 | 1529 | SetPageUptodate(page); |
ad7a2926 | 1530 | |
1da177e4 | 1531 | if (!PageUptodate(page)) { |
d9414774 NP |
1532 | char *page_data; |
1533 | unsigned offset = pos & (PAGE_CACHE_SIZE - 1); | |
1534 | int xid; | |
1535 | ||
1536 | xid = GetXid(); | |
1da177e4 LT |
1537 | /* this is probably better than directly calling |
1538 | partialpage_write since in this function the file handle is | |
1539 | known which we might as well leverage */ | |
1540 | /* BB check if anything else missing out of ppw | |
1541 | such as updating last write time */ | |
1542 | page_data = kmap(page); | |
d9414774 NP |
1543 | rc = cifs_write(file, page_data + offset, copied, &pos); |
1544 | /* if (rc < 0) should we set writebehind rc? */ | |
1da177e4 | 1545 | kunmap(page); |
d9414774 NP |
1546 | |
1547 | FreeXid(xid); | |
fb8c4b14 | 1548 | } else { |
d9414774 NP |
1549 | rc = copied; |
1550 | pos += copied; | |
1da177e4 LT |
1551 | set_page_dirty(page); |
1552 | } | |
1553 | ||
d9414774 NP |
1554 | if (rc > 0) { |
1555 | spin_lock(&inode->i_lock); | |
1556 | if (pos > inode->i_size) | |
1557 | i_size_write(inode, pos); | |
1558 | spin_unlock(&inode->i_lock); | |
1559 | } | |
1560 | ||
1561 | unlock_page(page); | |
1562 | page_cache_release(page); | |
1563 | ||
1da177e4 LT |
1564 | return rc; |
1565 | } | |
1566 | ||
1567 | int cifs_fsync(struct file *file, struct dentry *dentry, int datasync) | |
1568 | { | |
1569 | int xid; | |
1570 | int rc = 0; | |
b298f223 SF |
1571 | struct cifsTconInfo *tcon; |
1572 | struct cifsFileInfo *smbfile = | |
1573 | (struct cifsFileInfo *)file->private_data; | |
e6a00296 | 1574 | struct inode *inode = file->f_path.dentry->d_inode; |
1da177e4 LT |
1575 | |
1576 | xid = GetXid(); | |
1577 | ||
fb8c4b14 | 1578 | cFYI(1, ("Sync file - name: %s datasync: 0x%x", |
1da177e4 | 1579 | dentry->d_name.name, datasync)); |
50c2f753 | 1580 | |
cea21805 JL |
1581 | rc = filemap_write_and_wait(inode->i_mapping); |
1582 | if (rc == 0) { | |
1583 | rc = CIFS_I(inode)->write_behind_rc; | |
1da177e4 | 1584 | CIFS_I(inode)->write_behind_rc = 0; |
b298f223 | 1585 | tcon = CIFS_SB(inode->i_sb)->tcon; |
be652445 | 1586 | if (!rc && tcon && smbfile && |
4717bed6 | 1587 | !(CIFS_SB(inode->i_sb)->mnt_cifs_flags & CIFS_MOUNT_NOSSYNC)) |
b298f223 | 1588 | rc = CIFSSMBFlush(xid, tcon, smbfile->netfid); |
cea21805 | 1589 | } |
b298f223 | 1590 | |
1da177e4 LT |
1591 | FreeXid(xid); |
1592 | return rc; | |
1593 | } | |
1594 | ||
3978d717 | 1595 | /* static void cifs_sync_page(struct page *page) |
1da177e4 LT |
1596 | { |
1597 | struct address_space *mapping; | |
1598 | struct inode *inode; | |
1599 | unsigned long index = page->index; | |
1600 | unsigned int rpages = 0; | |
1601 | int rc = 0; | |
1602 | ||
1603 | cFYI(1, ("sync page %p",page)); | |
1604 | mapping = page->mapping; | |
1605 | if (!mapping) | |
1606 | return 0; | |
1607 | inode = mapping->host; | |
1608 | if (!inode) | |
3978d717 | 1609 | return; */ |
1da177e4 | 1610 | |
fb8c4b14 | 1611 | /* fill in rpages then |
1da177e4 LT |
1612 | result = cifs_pagein_inode(inode, index, rpages); */ /* BB finish */ |
1613 | ||
26a21b98 | 1614 | /* cFYI(1, ("rpages is %d for sync page of Index %ld", rpages, index)); |
1da177e4 | 1615 | |
3978d717 | 1616 | #if 0 |
1da177e4 LT |
1617 | if (rc < 0) |
1618 | return rc; | |
1619 | return 0; | |
3978d717 | 1620 | #endif |
1da177e4 LT |
1621 | } */ |
1622 | ||
1623 | /* | |
1624 | * As file closes, flush all cached write data for this inode checking | |
1625 | * for write behind errors. | |
1626 | */ | |
75e1fcc0 | 1627 | int cifs_flush(struct file *file, fl_owner_t id) |
1da177e4 | 1628 | { |
fb8c4b14 | 1629 | struct inode *inode = file->f_path.dentry->d_inode; |
1da177e4 LT |
1630 | int rc = 0; |
1631 | ||
1632 | /* Rather than do the steps manually: | |
1633 | lock the inode for writing | |
1634 | loop through pages looking for write behind data (dirty pages) | |
1635 | coalesce into contiguous 16K (or smaller) chunks to write to server | |
1636 | send to server (prefer in parallel) | |
1637 | deal with writebehind errors | |
1638 | unlock inode for writing | |
1639 | filemapfdatawrite appears easier for the time being */ | |
1640 | ||
1641 | rc = filemap_fdatawrite(inode->i_mapping); | |
cea21805 JL |
1642 | /* reset wb rc if we were able to write out dirty pages */ |
1643 | if (!rc) { | |
1644 | rc = CIFS_I(inode)->write_behind_rc; | |
1da177e4 | 1645 | CIFS_I(inode)->write_behind_rc = 0; |
cea21805 | 1646 | } |
50c2f753 | 1647 | |
fb8c4b14 | 1648 | cFYI(1, ("Flush inode %p file %p rc %d", inode, file, rc)); |
1da177e4 LT |
1649 | |
1650 | return rc; | |
1651 | } | |
1652 | ||
1653 | ssize_t cifs_user_read(struct file *file, char __user *read_data, | |
1654 | size_t read_size, loff_t *poffset) | |
1655 | { | |
1656 | int rc = -EACCES; | |
1657 | unsigned int bytes_read = 0; | |
1658 | unsigned int total_read = 0; | |
1659 | unsigned int current_read_size; | |
1660 | struct cifs_sb_info *cifs_sb; | |
1661 | struct cifsTconInfo *pTcon; | |
1662 | int xid; | |
1663 | struct cifsFileInfo *open_file; | |
1664 | char *smb_read_data; | |
1665 | char __user *current_offset; | |
1666 | struct smb_com_read_rsp *pSMBr; | |
1667 | ||
1668 | xid = GetXid(); | |
e6a00296 | 1669 | cifs_sb = CIFS_SB(file->f_path.dentry->d_sb); |
1da177e4 LT |
1670 | pTcon = cifs_sb->tcon; |
1671 | ||
1672 | if (file->private_data == NULL) { | |
1673 | FreeXid(xid); | |
1674 | return -EBADF; | |
1675 | } | |
1676 | open_file = (struct cifsFileInfo *)file->private_data; | |
1677 | ||
ad7a2926 | 1678 | if ((file->f_flags & O_ACCMODE) == O_WRONLY) |
1da177e4 | 1679 | cFYI(1, ("attempting read on write only file instance")); |
ad7a2926 | 1680 | |
1da177e4 LT |
1681 | for (total_read = 0, current_offset = read_data; |
1682 | read_size > total_read; | |
1683 | total_read += bytes_read, current_offset += bytes_read) { | |
fb8c4b14 | 1684 | current_read_size = min_t(const int, read_size - total_read, |
1da177e4 LT |
1685 | cifs_sb->rsize); |
1686 | rc = -EAGAIN; | |
1687 | smb_read_data = NULL; | |
1688 | while (rc == -EAGAIN) { | |
ec637e3f | 1689 | int buf_type = CIFS_NO_BUFFER; |
fb8c4b14 | 1690 | if ((open_file->invalidHandle) && |
1da177e4 | 1691 | (!open_file->closePend)) { |
4b18f2a9 | 1692 | rc = cifs_reopen_file(file, true); |
1da177e4 LT |
1693 | if (rc != 0) |
1694 | break; | |
1695 | } | |
bfa0d75a | 1696 | rc = CIFSSMBRead(xid, pTcon, |
ec637e3f SF |
1697 | open_file->netfid, |
1698 | current_read_size, *poffset, | |
1699 | &bytes_read, &smb_read_data, | |
1700 | &buf_type); | |
1da177e4 | 1701 | pSMBr = (struct smb_com_read_rsp *)smb_read_data; |
1da177e4 | 1702 | if (smb_read_data) { |
93544cc6 SF |
1703 | if (copy_to_user(current_offset, |
1704 | smb_read_data + | |
1705 | 4 /* RFC1001 length field */ + | |
1706 | le16_to_cpu(pSMBr->DataOffset), | |
ad7a2926 | 1707 | bytes_read)) |
93544cc6 | 1708 | rc = -EFAULT; |
93544cc6 | 1709 | |
fb8c4b14 | 1710 | if (buf_type == CIFS_SMALL_BUFFER) |
ec637e3f | 1711 | cifs_small_buf_release(smb_read_data); |
fb8c4b14 | 1712 | else if (buf_type == CIFS_LARGE_BUFFER) |
ec637e3f | 1713 | cifs_buf_release(smb_read_data); |
1da177e4 LT |
1714 | smb_read_data = NULL; |
1715 | } | |
1716 | } | |
1717 | if (rc || (bytes_read == 0)) { | |
1718 | if (total_read) { | |
1719 | break; | |
1720 | } else { | |
1721 | FreeXid(xid); | |
1722 | return rc; | |
1723 | } | |
1724 | } else { | |
a4544347 | 1725 | cifs_stats_bytes_read(pTcon, bytes_read); |
1da177e4 LT |
1726 | *poffset += bytes_read; |
1727 | } | |
1728 | } | |
1729 | FreeXid(xid); | |
1730 | return total_read; | |
1731 | } | |
1732 | ||
1733 | ||
1734 | static ssize_t cifs_read(struct file *file, char *read_data, size_t read_size, | |
1735 | loff_t *poffset) | |
1736 | { | |
1737 | int rc = -EACCES; | |
1738 | unsigned int bytes_read = 0; | |
1739 | unsigned int total_read; | |
1740 | unsigned int current_read_size; | |
1741 | struct cifs_sb_info *cifs_sb; | |
1742 | struct cifsTconInfo *pTcon; | |
1743 | int xid; | |
1744 | char *current_offset; | |
1745 | struct cifsFileInfo *open_file; | |
ec637e3f | 1746 | int buf_type = CIFS_NO_BUFFER; |
1da177e4 LT |
1747 | |
1748 | xid = GetXid(); | |
e6a00296 | 1749 | cifs_sb = CIFS_SB(file->f_path.dentry->d_sb); |
1da177e4 LT |
1750 | pTcon = cifs_sb->tcon; |
1751 | ||
1752 | if (file->private_data == NULL) { | |
1753 | FreeXid(xid); | |
1754 | return -EBADF; | |
1755 | } | |
1756 | open_file = (struct cifsFileInfo *)file->private_data; | |
1757 | ||
1758 | if ((file->f_flags & O_ACCMODE) == O_WRONLY) | |
1759 | cFYI(1, ("attempting read on write only file instance")); | |
1760 | ||
fb8c4b14 | 1761 | for (total_read = 0, current_offset = read_data; |
1da177e4 LT |
1762 | read_size > total_read; |
1763 | total_read += bytes_read, current_offset += bytes_read) { | |
1764 | current_read_size = min_t(const int, read_size - total_read, | |
1765 | cifs_sb->rsize); | |
f9f5c817 SF |
1766 | /* For windows me and 9x we do not want to request more |
1767 | than it negotiated since it will refuse the read then */ | |
fb8c4b14 | 1768 | if ((pTcon->ses) && |
f9f5c817 SF |
1769 | !(pTcon->ses->capabilities & CAP_LARGE_FILES)) { |
1770 | current_read_size = min_t(const int, current_read_size, | |
1771 | pTcon->ses->server->maxBuf - 128); | |
1772 | } | |
1da177e4 LT |
1773 | rc = -EAGAIN; |
1774 | while (rc == -EAGAIN) { | |
fb8c4b14 | 1775 | if ((open_file->invalidHandle) && |
1da177e4 | 1776 | (!open_file->closePend)) { |
4b18f2a9 | 1777 | rc = cifs_reopen_file(file, true); |
1da177e4 LT |
1778 | if (rc != 0) |
1779 | break; | |
1780 | } | |
bfa0d75a | 1781 | rc = CIFSSMBRead(xid, pTcon, |
ec637e3f SF |
1782 | open_file->netfid, |
1783 | current_read_size, *poffset, | |
1784 | &bytes_read, ¤t_offset, | |
1785 | &buf_type); | |
1da177e4 LT |
1786 | } |
1787 | if (rc || (bytes_read == 0)) { | |
1788 | if (total_read) { | |
1789 | break; | |
1790 | } else { | |
1791 | FreeXid(xid); | |
1792 | return rc; | |
1793 | } | |
1794 | } else { | |
a4544347 | 1795 | cifs_stats_bytes_read(pTcon, total_read); |
1da177e4 LT |
1796 | *poffset += bytes_read; |
1797 | } | |
1798 | } | |
1799 | FreeXid(xid); | |
1800 | return total_read; | |
1801 | } | |
1802 | ||
1803 | int cifs_file_mmap(struct file *file, struct vm_area_struct *vma) | |
1804 | { | |
e6a00296 | 1805 | struct dentry *dentry = file->f_path.dentry; |
1da177e4 LT |
1806 | int rc, xid; |
1807 | ||
1808 | xid = GetXid(); | |
1809 | rc = cifs_revalidate(dentry); | |
1810 | if (rc) { | |
1811 | cFYI(1, ("Validation prior to mmap failed, error=%d", rc)); | |
1812 | FreeXid(xid); | |
1813 | return rc; | |
1814 | } | |
1815 | rc = generic_file_mmap(file, vma); | |
1816 | FreeXid(xid); | |
1817 | return rc; | |
1818 | } | |
1819 | ||
1820 | ||
fb8c4b14 | 1821 | static void cifs_copy_cache_pages(struct address_space *mapping, |
1da177e4 LT |
1822 | struct list_head *pages, int bytes_read, char *data, |
1823 | struct pagevec *plru_pvec) | |
1824 | { | |
1825 | struct page *page; | |
1826 | char *target; | |
1827 | ||
1828 | while (bytes_read > 0) { | |
1829 | if (list_empty(pages)) | |
1830 | break; | |
1831 | ||
1832 | page = list_entry(pages->prev, struct page, lru); | |
1833 | list_del(&page->lru); | |
1834 | ||
1835 | if (add_to_page_cache(page, mapping, page->index, | |
1836 | GFP_KERNEL)) { | |
1837 | page_cache_release(page); | |
1838 | cFYI(1, ("Add page cache failed")); | |
3079ca62 SF |
1839 | data += PAGE_CACHE_SIZE; |
1840 | bytes_read -= PAGE_CACHE_SIZE; | |
1da177e4 LT |
1841 | continue; |
1842 | } | |
1843 | ||
fb8c4b14 | 1844 | target = kmap_atomic(page, KM_USER0); |
1da177e4 LT |
1845 | |
1846 | if (PAGE_CACHE_SIZE > bytes_read) { | |
1847 | memcpy(target, data, bytes_read); | |
1848 | /* zero the tail end of this partial page */ | |
fb8c4b14 | 1849 | memset(target + bytes_read, 0, |
1da177e4 LT |
1850 | PAGE_CACHE_SIZE - bytes_read); |
1851 | bytes_read = 0; | |
1852 | } else { | |
1853 | memcpy(target, data, PAGE_CACHE_SIZE); | |
1854 | bytes_read -= PAGE_CACHE_SIZE; | |
1855 | } | |
1856 | kunmap_atomic(target, KM_USER0); | |
1857 | ||
1858 | flush_dcache_page(page); | |
1859 | SetPageUptodate(page); | |
1860 | unlock_page(page); | |
1861 | if (!pagevec_add(plru_pvec, page)) | |
4f98a2fe | 1862 | __pagevec_lru_add_file(plru_pvec); |
1da177e4 LT |
1863 | data += PAGE_CACHE_SIZE; |
1864 | } | |
1865 | return; | |
1866 | } | |
1867 | ||
1868 | static int cifs_readpages(struct file *file, struct address_space *mapping, | |
1869 | struct list_head *page_list, unsigned num_pages) | |
1870 | { | |
1871 | int rc = -EACCES; | |
1872 | int xid; | |
1873 | loff_t offset; | |
1874 | struct page *page; | |
1875 | struct cifs_sb_info *cifs_sb; | |
1876 | struct cifsTconInfo *pTcon; | |
2c2130e1 | 1877 | unsigned int bytes_read = 0; |
fb8c4b14 | 1878 | unsigned int read_size, i; |
1da177e4 LT |
1879 | char *smb_read_data = NULL; |
1880 | struct smb_com_read_rsp *pSMBr; | |
1881 | struct pagevec lru_pvec; | |
1882 | struct cifsFileInfo *open_file; | |
ec637e3f | 1883 | int buf_type = CIFS_NO_BUFFER; |
1da177e4 LT |
1884 | |
1885 | xid = GetXid(); | |
1886 | if (file->private_data == NULL) { | |
1887 | FreeXid(xid); | |
1888 | return -EBADF; | |
1889 | } | |
1890 | open_file = (struct cifsFileInfo *)file->private_data; | |
e6a00296 | 1891 | cifs_sb = CIFS_SB(file->f_path.dentry->d_sb); |
1da177e4 | 1892 | pTcon = cifs_sb->tcon; |
bfa0d75a | 1893 | |
1da177e4 | 1894 | pagevec_init(&lru_pvec, 0); |
61de800d | 1895 | cFYI(DBG2, ("rpages: num pages %d", num_pages)); |
1da177e4 LT |
1896 | for (i = 0; i < num_pages; ) { |
1897 | unsigned contig_pages; | |
1898 | struct page *tmp_page; | |
1899 | unsigned long expected_index; | |
1900 | ||
1901 | if (list_empty(page_list)) | |
1902 | break; | |
1903 | ||
1904 | page = list_entry(page_list->prev, struct page, lru); | |
1905 | offset = (loff_t)page->index << PAGE_CACHE_SHIFT; | |
1906 | ||
1907 | /* count adjacent pages that we will read into */ | |
1908 | contig_pages = 0; | |
fb8c4b14 | 1909 | expected_index = |
1da177e4 | 1910 | list_entry(page_list->prev, struct page, lru)->index; |
fb8c4b14 | 1911 | list_for_each_entry_reverse(tmp_page, page_list, lru) { |
1da177e4 LT |
1912 | if (tmp_page->index == expected_index) { |
1913 | contig_pages++; | |
1914 | expected_index++; | |
1915 | } else | |
fb8c4b14 | 1916 | break; |
1da177e4 LT |
1917 | } |
1918 | if (contig_pages + i > num_pages) | |
1919 | contig_pages = num_pages - i; | |
1920 | ||
1921 | /* for reads over a certain size could initiate async | |
1922 | read ahead */ | |
1923 | ||
1924 | read_size = contig_pages * PAGE_CACHE_SIZE; | |
1925 | /* Read size needs to be in multiples of one page */ | |
1926 | read_size = min_t(const unsigned int, read_size, | |
1927 | cifs_sb->rsize & PAGE_CACHE_MASK); | |
90c81e0b | 1928 | cFYI(DBG2, ("rpages: read size 0x%x contiguous pages %d", |
75865f8c | 1929 | read_size, contig_pages)); |
1da177e4 LT |
1930 | rc = -EAGAIN; |
1931 | while (rc == -EAGAIN) { | |
fb8c4b14 | 1932 | if ((open_file->invalidHandle) && |
1da177e4 | 1933 | (!open_file->closePend)) { |
4b18f2a9 | 1934 | rc = cifs_reopen_file(file, true); |
1da177e4 LT |
1935 | if (rc != 0) |
1936 | break; | |
1937 | } | |
1938 | ||
bfa0d75a | 1939 | rc = CIFSSMBRead(xid, pTcon, |
ec637e3f SF |
1940 | open_file->netfid, |
1941 | read_size, offset, | |
1942 | &bytes_read, &smb_read_data, | |
1943 | &buf_type); | |
a9d02ad4 | 1944 | /* BB more RC checks ? */ |
fb8c4b14 | 1945 | if (rc == -EAGAIN) { |
1da177e4 | 1946 | if (smb_read_data) { |
fb8c4b14 | 1947 | if (buf_type == CIFS_SMALL_BUFFER) |
ec637e3f | 1948 | cifs_small_buf_release(smb_read_data); |
fb8c4b14 | 1949 | else if (buf_type == CIFS_LARGE_BUFFER) |
ec637e3f | 1950 | cifs_buf_release(smb_read_data); |
1da177e4 LT |
1951 | smb_read_data = NULL; |
1952 | } | |
1953 | } | |
1954 | } | |
1955 | if ((rc < 0) || (smb_read_data == NULL)) { | |
1956 | cFYI(1, ("Read error in readpages: %d", rc)); | |
1da177e4 LT |
1957 | break; |
1958 | } else if (bytes_read > 0) { | |
6f88cc2e | 1959 | task_io_account_read(bytes_read); |
1da177e4 LT |
1960 | pSMBr = (struct smb_com_read_rsp *)smb_read_data; |
1961 | cifs_copy_cache_pages(mapping, page_list, bytes_read, | |
1962 | smb_read_data + 4 /* RFC1001 hdr */ + | |
1963 | le16_to_cpu(pSMBr->DataOffset), &lru_pvec); | |
1964 | ||
1965 | i += bytes_read >> PAGE_CACHE_SHIFT; | |
a4544347 | 1966 | cifs_stats_bytes_read(pTcon, bytes_read); |
2c2130e1 | 1967 | if ((bytes_read & PAGE_CACHE_MASK) != bytes_read) { |
1da177e4 LT |
1968 | i++; /* account for partial page */ |
1969 | ||
fb8c4b14 | 1970 | /* server copy of file can have smaller size |
1da177e4 | 1971 | than client */ |
fb8c4b14 SF |
1972 | /* BB do we need to verify this common case ? |
1973 | this case is ok - if we are at server EOF | |
1da177e4 LT |
1974 | we will hit it on next read */ |
1975 | ||
05ac9d4b | 1976 | /* break; */ |
1da177e4 LT |
1977 | } |
1978 | } else { | |
1979 | cFYI(1, ("No bytes read (%d) at offset %lld . " | |
1980 | "Cleaning remaining pages from readahead list", | |
1981 | bytes_read, offset)); | |
fb8c4b14 | 1982 | /* BB turn off caching and do new lookup on |
1da177e4 | 1983 | file size at server? */ |
1da177e4 LT |
1984 | break; |
1985 | } | |
1986 | if (smb_read_data) { | |
fb8c4b14 | 1987 | if (buf_type == CIFS_SMALL_BUFFER) |
ec637e3f | 1988 | cifs_small_buf_release(smb_read_data); |
fb8c4b14 | 1989 | else if (buf_type == CIFS_LARGE_BUFFER) |
ec637e3f | 1990 | cifs_buf_release(smb_read_data); |
1da177e4 LT |
1991 | smb_read_data = NULL; |
1992 | } | |
1993 | bytes_read = 0; | |
1994 | } | |
1995 | ||
4f98a2fe | 1996 | pagevec_lru_add_file(&lru_pvec); |
1da177e4 LT |
1997 | |
1998 | /* need to free smb_read_data buf before exit */ | |
1999 | if (smb_read_data) { | |
fb8c4b14 | 2000 | if (buf_type == CIFS_SMALL_BUFFER) |
47c886b3 | 2001 | cifs_small_buf_release(smb_read_data); |
fb8c4b14 | 2002 | else if (buf_type == CIFS_LARGE_BUFFER) |
47c886b3 | 2003 | cifs_buf_release(smb_read_data); |
1da177e4 | 2004 | smb_read_data = NULL; |
fb8c4b14 | 2005 | } |
1da177e4 LT |
2006 | |
2007 | FreeXid(xid); | |
2008 | return rc; | |
2009 | } | |
2010 | ||
2011 | static int cifs_readpage_worker(struct file *file, struct page *page, | |
2012 | loff_t *poffset) | |
2013 | { | |
2014 | char *read_data; | |
2015 | int rc; | |
2016 | ||
2017 | page_cache_get(page); | |
2018 | read_data = kmap(page); | |
2019 | /* for reads over a certain size could initiate async read ahead */ | |
fb8c4b14 | 2020 | |
1da177e4 | 2021 | rc = cifs_read(file, read_data, PAGE_CACHE_SIZE, poffset); |
fb8c4b14 | 2022 | |
1da177e4 LT |
2023 | if (rc < 0) |
2024 | goto io_error; | |
2025 | else | |
fb8c4b14 SF |
2026 | cFYI(1, ("Bytes read %d", rc)); |
2027 | ||
e6a00296 JJS |
2028 | file->f_path.dentry->d_inode->i_atime = |
2029 | current_fs_time(file->f_path.dentry->d_inode->i_sb); | |
fb8c4b14 | 2030 | |
1da177e4 LT |
2031 | if (PAGE_CACHE_SIZE > rc) |
2032 | memset(read_data + rc, 0, PAGE_CACHE_SIZE - rc); | |
2033 | ||
2034 | flush_dcache_page(page); | |
2035 | SetPageUptodate(page); | |
2036 | rc = 0; | |
fb8c4b14 | 2037 | |
1da177e4 | 2038 | io_error: |
fb8c4b14 | 2039 | kunmap(page); |
1da177e4 LT |
2040 | page_cache_release(page); |
2041 | return rc; | |
2042 | } | |
2043 | ||
2044 | static int cifs_readpage(struct file *file, struct page *page) | |
2045 | { | |
2046 | loff_t offset = (loff_t)page->index << PAGE_CACHE_SHIFT; | |
2047 | int rc = -EACCES; | |
2048 | int xid; | |
2049 | ||
2050 | xid = GetXid(); | |
2051 | ||
2052 | if (file->private_data == NULL) { | |
2053 | FreeXid(xid); | |
2054 | return -EBADF; | |
2055 | } | |
2056 | ||
fb8c4b14 | 2057 | cFYI(1, ("readpage %p at offset %d 0x%x\n", |
1da177e4 LT |
2058 | page, (int)offset, (int)offset)); |
2059 | ||
2060 | rc = cifs_readpage_worker(file, page, &offset); | |
2061 | ||
2062 | unlock_page(page); | |
2063 | ||
2064 | FreeXid(xid); | |
2065 | return rc; | |
2066 | } | |
2067 | ||
a403a0a3 SF |
2068 | static int is_inode_writable(struct cifsInodeInfo *cifs_inode) |
2069 | { | |
2070 | struct cifsFileInfo *open_file; | |
2071 | ||
2072 | read_lock(&GlobalSMBSeslock); | |
2073 | list_for_each_entry(open_file, &cifs_inode->openFileList, flist) { | |
2074 | if (open_file->closePend) | |
2075 | continue; | |
2076 | if (open_file->pfile && | |
2077 | ((open_file->pfile->f_flags & O_RDWR) || | |
2078 | (open_file->pfile->f_flags & O_WRONLY))) { | |
2079 | read_unlock(&GlobalSMBSeslock); | |
2080 | return 1; | |
2081 | } | |
2082 | } | |
2083 | read_unlock(&GlobalSMBSeslock); | |
2084 | return 0; | |
2085 | } | |
2086 | ||
1da177e4 LT |
2087 | /* We do not want to update the file size from server for inodes |
2088 | open for write - to avoid races with writepage extending | |
2089 | the file - in the future we could consider allowing | |
fb8c4b14 | 2090 | refreshing the inode only on increases in the file size |
1da177e4 LT |
2091 | but this is tricky to do without racing with writebehind |
2092 | page caching in the current Linux kernel design */ | |
4b18f2a9 | 2093 | bool is_size_safe_to_change(struct cifsInodeInfo *cifsInode, __u64 end_of_file) |
1da177e4 | 2094 | { |
a403a0a3 | 2095 | if (!cifsInode) |
4b18f2a9 | 2096 | return true; |
50c2f753 | 2097 | |
a403a0a3 SF |
2098 | if (is_inode_writable(cifsInode)) { |
2099 | /* This inode is open for write at least once */ | |
c32a0b68 SF |
2100 | struct cifs_sb_info *cifs_sb; |
2101 | ||
c32a0b68 | 2102 | cifs_sb = CIFS_SB(cifsInode->vfs_inode.i_sb); |
ad7a2926 | 2103 | if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DIRECT_IO) { |
fb8c4b14 | 2104 | /* since no page cache to corrupt on directio |
c32a0b68 | 2105 | we can change size safely */ |
4b18f2a9 | 2106 | return true; |
c32a0b68 SF |
2107 | } |
2108 | ||
fb8c4b14 | 2109 | if (i_size_read(&cifsInode->vfs_inode) < end_of_file) |
4b18f2a9 | 2110 | return true; |
7ba52631 | 2111 | |
4b18f2a9 | 2112 | return false; |
23e7dd7d | 2113 | } else |
4b18f2a9 | 2114 | return true; |
1da177e4 LT |
2115 | } |
2116 | ||
d9414774 NP |
2117 | static int cifs_write_begin(struct file *file, struct address_space *mapping, |
2118 | loff_t pos, unsigned len, unsigned flags, | |
2119 | struct page **pagep, void **fsdata) | |
1da177e4 | 2120 | { |
d9414774 NP |
2121 | pgoff_t index = pos >> PAGE_CACHE_SHIFT; |
2122 | loff_t offset = pos & (PAGE_CACHE_SIZE - 1); | |
a98ee8c1 JL |
2123 | loff_t page_start = pos & PAGE_MASK; |
2124 | loff_t i_size; | |
2125 | struct page *page; | |
2126 | int rc = 0; | |
d9414774 NP |
2127 | |
2128 | cFYI(1, ("write_begin from %lld len %d", (long long)pos, len)); | |
2129 | ||
54566b2c | 2130 | page = grab_cache_page_write_begin(mapping, index, flags); |
a98ee8c1 JL |
2131 | if (!page) { |
2132 | rc = -ENOMEM; | |
2133 | goto out; | |
2134 | } | |
8a236264 | 2135 | |
a98ee8c1 JL |
2136 | if (PageUptodate(page)) |
2137 | goto out; | |
8a236264 | 2138 | |
a98ee8c1 JL |
2139 | /* |
2140 | * If we write a full page it will be up to date, no need to read from | |
2141 | * the server. If the write is short, we'll end up doing a sync write | |
2142 | * instead. | |
2143 | */ | |
2144 | if (len == PAGE_CACHE_SIZE) | |
2145 | goto out; | |
8a236264 | 2146 | |
a98ee8c1 JL |
2147 | /* |
2148 | * optimize away the read when we have an oplock, and we're not | |
2149 | * expecting to use any of the data we'd be reading in. That | |
2150 | * is, when the page lies beyond the EOF, or straddles the EOF | |
2151 | * and the write will cover all of the existing data. | |
2152 | */ | |
2153 | if (CIFS_I(mapping->host)->clientCanCacheRead) { | |
2154 | i_size = i_size_read(mapping->host); | |
2155 | if (page_start >= i_size || | |
2156 | (offset == 0 && (pos + len) >= i_size)) { | |
2157 | zero_user_segments(page, 0, offset, | |
2158 | offset + len, | |
2159 | PAGE_CACHE_SIZE); | |
2160 | /* | |
2161 | * PageChecked means that the parts of the page | |
2162 | * to which we're not writing are considered up | |
2163 | * to date. Once the data is copied to the | |
2164 | * page, it can be set uptodate. | |
2165 | */ | |
2166 | SetPageChecked(page); | |
2167 | goto out; | |
2168 | } | |
2169 | } | |
d9414774 | 2170 | |
a98ee8c1 JL |
2171 | if ((file->f_flags & O_ACCMODE) != O_WRONLY) { |
2172 | /* | |
2173 | * might as well read a page, it is fast enough. If we get | |
2174 | * an error, we don't need to return it. cifs_write_end will | |
2175 | * do a sync write instead since PG_uptodate isn't set. | |
2176 | */ | |
2177 | cifs_readpage_worker(file, page, &page_start); | |
8a236264 SF |
2178 | } else { |
2179 | /* we could try using another file handle if there is one - | |
2180 | but how would we lock it to prevent close of that handle | |
2181 | racing with this read? In any case | |
d9414774 | 2182 | this will be written out by write_end so is fine */ |
1da177e4 | 2183 | } |
a98ee8c1 JL |
2184 | out: |
2185 | *pagep = page; | |
2186 | return rc; | |
1da177e4 LT |
2187 | } |
2188 | ||
f5e54d6e | 2189 | const struct address_space_operations cifs_addr_ops = { |
1da177e4 LT |
2190 | .readpage = cifs_readpage, |
2191 | .readpages = cifs_readpages, | |
2192 | .writepage = cifs_writepage, | |
37c0eb46 | 2193 | .writepages = cifs_writepages, |
d9414774 NP |
2194 | .write_begin = cifs_write_begin, |
2195 | .write_end = cifs_write_end, | |
1da177e4 LT |
2196 | .set_page_dirty = __set_page_dirty_nobuffers, |
2197 | /* .sync_page = cifs_sync_page, */ | |
2198 | /* .direct_IO = */ | |
2199 | }; | |
273d81d6 DK |
2200 | |
2201 | /* | |
2202 | * cifs_readpages requires the server to support a buffer large enough to | |
2203 | * contain the header plus one complete page of data. Otherwise, we need | |
2204 | * to leave cifs_readpages out of the address space operations. | |
2205 | */ | |
f5e54d6e | 2206 | const struct address_space_operations cifs_addr_ops_smallbuf = { |
273d81d6 DK |
2207 | .readpage = cifs_readpage, |
2208 | .writepage = cifs_writepage, | |
2209 | .writepages = cifs_writepages, | |
d9414774 NP |
2210 | .write_begin = cifs_write_begin, |
2211 | .write_end = cifs_write_end, | |
273d81d6 DK |
2212 | .set_page_dirty = __set_page_dirty_nobuffers, |
2213 | /* .sync_page = cifs_sync_page, */ | |
2214 | /* .direct_IO = */ | |
2215 | }; |