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 | ||
276a74a4 SF |
127 | /* all arguments to this function must be checked for validity in caller */ |
128 | static inline int cifs_posix_open_inode_helper(struct inode *inode, | |
129 | struct file *file, struct cifsInodeInfo *pCifsInode, | |
130 | struct cifsFileInfo *pCifsFile, int oplock, u16 netfid) | |
131 | { | |
132 | struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb); | |
133 | /* struct timespec temp; */ /* BB REMOVEME BB */ | |
134 | ||
135 | file->private_data = kmalloc(sizeof(struct cifsFileInfo), GFP_KERNEL); | |
136 | if (file->private_data == NULL) | |
137 | return -ENOMEM; | |
138 | pCifsFile = cifs_init_private(file->private_data, inode, file, netfid); | |
139 | write_lock(&GlobalSMBSeslock); | |
140 | list_add(&pCifsFile->tlist, &cifs_sb->tcon->openFileList); | |
141 | ||
142 | pCifsInode = CIFS_I(file->f_path.dentry->d_inode); | |
143 | if (pCifsInode == NULL) { | |
144 | write_unlock(&GlobalSMBSeslock); | |
145 | return -EINVAL; | |
146 | } | |
147 | ||
148 | /* want handles we can use to read with first | |
149 | in the list so we do not have to walk the | |
150 | list to search for one in write_begin */ | |
151 | if ((file->f_flags & O_ACCMODE) == O_WRONLY) { | |
152 | list_add_tail(&pCifsFile->flist, | |
153 | &pCifsInode->openFileList); | |
154 | } else { | |
155 | list_add(&pCifsFile->flist, | |
156 | &pCifsInode->openFileList); | |
157 | } | |
158 | ||
159 | if (pCifsInode->clientCanCacheRead) { | |
160 | /* we have the inode open somewhere else | |
161 | no need to discard cache data */ | |
162 | goto psx_client_can_cache; | |
163 | } | |
164 | ||
165 | /* BB FIXME need to fix this check to move it earlier into posix_open | |
166 | BB fIX following section BB FIXME */ | |
167 | ||
168 | /* if not oplocked, invalidate inode pages if mtime or file | |
169 | size changed */ | |
170 | /* temp = cifs_NTtimeToUnix(le64_to_cpu(buf->LastWriteTime)); | |
171 | if (timespec_equal(&file->f_path.dentry->d_inode->i_mtime, &temp) && | |
172 | (file->f_path.dentry->d_inode->i_size == | |
173 | (loff_t)le64_to_cpu(buf->EndOfFile))) { | |
174 | cFYI(1, ("inode unchanged on server")); | |
175 | } else { | |
176 | if (file->f_path.dentry->d_inode->i_mapping) { | |
177 | rc = filemap_write_and_wait(file->f_path.dentry->d_inode->i_mapping); | |
178 | if (rc != 0) | |
179 | CIFS_I(file->f_path.dentry->d_inode)->write_behind_rc = rc; | |
180 | } | |
181 | cFYI(1, ("invalidating remote inode since open detected it " | |
182 | "changed")); | |
183 | invalidate_remote_inode(file->f_path.dentry->d_inode); | |
184 | } */ | |
185 | ||
186 | psx_client_can_cache: | |
187 | if ((oplock & 0xF) == OPLOCK_EXCLUSIVE) { | |
188 | pCifsInode->clientCanCacheAll = true; | |
189 | pCifsInode->clientCanCacheRead = true; | |
190 | cFYI(1, ("Exclusive Oplock granted on inode %p", | |
191 | file->f_path.dentry->d_inode)); | |
192 | } else if ((oplock & 0xF) == OPLOCK_READ) | |
193 | pCifsInode->clientCanCacheRead = true; | |
194 | ||
195 | /* will have to change the unlock if we reenable the | |
196 | filemap_fdatawrite (which does not seem necessary */ | |
197 | write_unlock(&GlobalSMBSeslock); | |
198 | return 0; | |
199 | } | |
200 | ||
1da177e4 LT |
201 | /* all arguments to this function must be checked for validity in caller */ |
202 | static inline int cifs_open_inode_helper(struct inode *inode, struct file *file, | |
203 | struct cifsInodeInfo *pCifsInode, struct cifsFileInfo *pCifsFile, | |
204 | struct cifsTconInfo *pTcon, int *oplock, FILE_ALL_INFO *buf, | |
205 | char *full_path, int xid) | |
206 | { | |
207 | struct timespec temp; | |
208 | int rc; | |
209 | ||
210 | /* want handles we can use to read with first | |
211 | in the list so we do not have to walk the | |
d9414774 | 212 | list to search for one in write_begin */ |
1da177e4 | 213 | if ((file->f_flags & O_ACCMODE) == O_WRONLY) { |
fb8c4b14 | 214 | list_add_tail(&pCifsFile->flist, |
1da177e4 LT |
215 | &pCifsInode->openFileList); |
216 | } else { | |
217 | list_add(&pCifsFile->flist, | |
218 | &pCifsInode->openFileList); | |
219 | } | |
220 | write_unlock(&GlobalSMBSeslock); | |
1da177e4 LT |
221 | if (pCifsInode->clientCanCacheRead) { |
222 | /* we have the inode open somewhere else | |
223 | no need to discard cache data */ | |
224 | goto client_can_cache; | |
225 | } | |
226 | ||
227 | /* BB need same check in cifs_create too? */ | |
228 | /* if not oplocked, invalidate inode pages if mtime or file | |
229 | size changed */ | |
230 | temp = cifs_NTtimeToUnix(le64_to_cpu(buf->LastWriteTime)); | |
e6a00296 JJS |
231 | if (timespec_equal(&file->f_path.dentry->d_inode->i_mtime, &temp) && |
232 | (file->f_path.dentry->d_inode->i_size == | |
1da177e4 LT |
233 | (loff_t)le64_to_cpu(buf->EndOfFile))) { |
234 | cFYI(1, ("inode unchanged on server")); | |
235 | } else { | |
e6a00296 | 236 | if (file->f_path.dentry->d_inode->i_mapping) { |
1da177e4 LT |
237 | /* BB no need to lock inode until after invalidate |
238 | since namei code should already have it locked? */ | |
cea21805 JL |
239 | rc = filemap_write_and_wait(file->f_path.dentry->d_inode->i_mapping); |
240 | if (rc != 0) | |
241 | CIFS_I(file->f_path.dentry->d_inode)->write_behind_rc = rc; | |
1da177e4 LT |
242 | } |
243 | cFYI(1, ("invalidating remote inode since open detected it " | |
244 | "changed")); | |
e6a00296 | 245 | invalidate_remote_inode(file->f_path.dentry->d_inode); |
1da177e4 LT |
246 | } |
247 | ||
248 | client_can_cache: | |
c18c842b | 249 | if (pTcon->unix_ext) |
e6a00296 | 250 | rc = cifs_get_inode_info_unix(&file->f_path.dentry->d_inode, |
1da177e4 LT |
251 | full_path, inode->i_sb, xid); |
252 | else | |
e6a00296 | 253 | rc = cifs_get_inode_info(&file->f_path.dentry->d_inode, |
8b1327f6 | 254 | full_path, buf, inode->i_sb, xid, NULL); |
1da177e4 LT |
255 | |
256 | if ((*oplock & 0xF) == OPLOCK_EXCLUSIVE) { | |
4b18f2a9 SF |
257 | pCifsInode->clientCanCacheAll = true; |
258 | pCifsInode->clientCanCacheRead = true; | |
1da177e4 | 259 | cFYI(1, ("Exclusive Oplock granted on inode %p", |
e6a00296 | 260 | file->f_path.dentry->d_inode)); |
1da177e4 | 261 | } else if ((*oplock & 0xF) == OPLOCK_READ) |
4b18f2a9 | 262 | pCifsInode->clientCanCacheRead = true; |
1da177e4 LT |
263 | |
264 | return rc; | |
265 | } | |
266 | ||
267 | int cifs_open(struct inode *inode, struct file *file) | |
268 | { | |
269 | int rc = -EACCES; | |
270 | int xid, oplock; | |
271 | struct cifs_sb_info *cifs_sb; | |
276a74a4 | 272 | struct cifsTconInfo *tcon; |
1da177e4 LT |
273 | struct cifsFileInfo *pCifsFile; |
274 | struct cifsInodeInfo *pCifsInode; | |
275 | struct list_head *tmp; | |
276 | char *full_path = NULL; | |
277 | int desiredAccess; | |
278 | int disposition; | |
279 | __u16 netfid; | |
280 | FILE_ALL_INFO *buf = NULL; | |
281 | ||
282 | xid = GetXid(); | |
283 | ||
284 | cifs_sb = CIFS_SB(inode->i_sb); | |
276a74a4 | 285 | tcon = cifs_sb->tcon; |
1da177e4 LT |
286 | |
287 | if (file->f_flags & O_CREAT) { | |
288 | /* search inode for this file and fill in file->private_data */ | |
e6a00296 | 289 | pCifsInode = CIFS_I(file->f_path.dentry->d_inode); |
1da177e4 LT |
290 | read_lock(&GlobalSMBSeslock); |
291 | list_for_each(tmp, &pCifsInode->openFileList) { | |
292 | pCifsFile = list_entry(tmp, struct cifsFileInfo, | |
293 | flist); | |
294 | if ((pCifsFile->pfile == NULL) && | |
295 | (pCifsFile->pid == current->tgid)) { | |
296 | /* mode set in cifs_create */ | |
297 | ||
298 | /* needed for writepage */ | |
299 | pCifsFile->pfile = file; | |
50c2f753 | 300 | |
1da177e4 LT |
301 | file->private_data = pCifsFile; |
302 | break; | |
303 | } | |
304 | } | |
305 | read_unlock(&GlobalSMBSeslock); | |
306 | if (file->private_data != NULL) { | |
307 | rc = 0; | |
308 | FreeXid(xid); | |
309 | return rc; | |
310 | } else { | |
311 | if (file->f_flags & O_EXCL) | |
312 | cERROR(1, ("could not find file instance for " | |
26a21b98 | 313 | "new file %p", file)); |
1da177e4 LT |
314 | } |
315 | } | |
316 | ||
e6a00296 | 317 | full_path = build_path_from_dentry(file->f_path.dentry); |
1da177e4 LT |
318 | if (full_path == NULL) { |
319 | FreeXid(xid); | |
320 | return -ENOMEM; | |
321 | } | |
322 | ||
7521a3c5 | 323 | cFYI(1, ("inode = 0x%p file flags are 0x%x for %s", |
1da177e4 | 324 | inode, file->f_flags, full_path)); |
276a74a4 SF |
325 | |
326 | if (oplockEnabled) | |
327 | oplock = REQ_OPLOCK; | |
328 | else | |
329 | oplock = 0; | |
330 | ||
64cc2c63 SF |
331 | if (!tcon->broken_posix_open && tcon->unix_ext && |
332 | (tcon->ses->capabilities & CAP_UNIX) && | |
276a74a4 SF |
333 | (CIFS_UNIX_POSIX_PATH_OPS_CAP & |
334 | le64_to_cpu(tcon->fsUnixInfo.Capability))) { | |
335 | int oflags = (int) cifs_posix_convert_flags(file->f_flags); | |
336 | /* can not refresh inode info since size could be stale */ | |
337 | rc = cifs_posix_open(full_path, &inode, inode->i_sb, | |
338 | cifs_sb->mnt_file_mode /* ignored */, | |
339 | oflags, &oplock, &netfid, xid); | |
340 | if (rc == 0) { | |
341 | cFYI(1, ("posix open succeeded")); | |
342 | /* no need for special case handling of setting mode | |
343 | on read only files needed here */ | |
344 | ||
345 | cifs_posix_open_inode_helper(inode, file, pCifsInode, | |
346 | pCifsFile, oplock, netfid); | |
347 | goto out; | |
64cc2c63 SF |
348 | } else if ((rc == -EINVAL) || (rc == -EOPNOTSUPP)) { |
349 | if (tcon->ses->serverNOS) | |
350 | cERROR(1, ("server %s of type %s returned" | |
351 | " unexpected error on SMB posix open" | |
352 | ", disabling posix open support." | |
353 | " Check if server update available.", | |
354 | tcon->ses->serverName, | |
355 | tcon->ses->serverNOS)); | |
356 | tcon->broken_posix_open = true; | |
276a74a4 SF |
357 | } else if ((rc != -EIO) && (rc != -EREMOTE) && |
358 | (rc != -EOPNOTSUPP)) /* path not found or net err */ | |
359 | goto out; | |
64cc2c63 SF |
360 | /* else fallthrough to retry open the old way on network i/o |
361 | or DFS errors */ | |
276a74a4 SF |
362 | } |
363 | ||
1da177e4 LT |
364 | desiredAccess = cifs_convert_flags(file->f_flags); |
365 | ||
366 | /********************************************************************* | |
367 | * open flag mapping table: | |
fb8c4b14 | 368 | * |
1da177e4 | 369 | * POSIX Flag CIFS Disposition |
fb8c4b14 | 370 | * ---------- ---------------- |
1da177e4 LT |
371 | * O_CREAT FILE_OPEN_IF |
372 | * O_CREAT | O_EXCL FILE_CREATE | |
373 | * O_CREAT | O_TRUNC FILE_OVERWRITE_IF | |
374 | * O_TRUNC FILE_OVERWRITE | |
375 | * none of the above FILE_OPEN | |
376 | * | |
377 | * Note that there is not a direct match between disposition | |
fb8c4b14 | 378 | * FILE_SUPERSEDE (ie create whether or not file exists although |
1da177e4 LT |
379 | * O_CREAT | O_TRUNC is similar but truncates the existing |
380 | * file rather than creating a new file as FILE_SUPERSEDE does | |
381 | * (which uses the attributes / metadata passed in on open call) | |
382 | *? | |
fb8c4b14 | 383 | *? O_SYNC is a reasonable match to CIFS writethrough flag |
1da177e4 LT |
384 | *? and the read write flags match reasonably. O_LARGEFILE |
385 | *? is irrelevant because largefile support is always used | |
386 | *? by this client. Flags O_APPEND, O_DIRECT, O_DIRECTORY, | |
387 | * O_FASYNC, O_NOFOLLOW, O_NONBLOCK need further investigation | |
388 | *********************************************************************/ | |
389 | ||
390 | disposition = cifs_get_disposition(file->f_flags); | |
391 | ||
1da177e4 LT |
392 | /* BB pass O_SYNC flag through on file attributes .. BB */ |
393 | ||
394 | /* Also refresh inode by passing in file_info buf returned by SMBOpen | |
395 | and calling get_inode_info with returned buf (at least helps | |
396 | non-Unix server case) */ | |
397 | ||
fb8c4b14 SF |
398 | /* BB we can not do this if this is the second open of a file |
399 | and the first handle has writebehind data, we might be | |
1da177e4 LT |
400 | able to simply do a filemap_fdatawrite/filemap_fdatawait first */ |
401 | buf = kmalloc(sizeof(FILE_ALL_INFO), GFP_KERNEL); | |
402 | if (!buf) { | |
403 | rc = -ENOMEM; | |
404 | goto out; | |
405 | } | |
5bafd765 SF |
406 | |
407 | if (cifs_sb->tcon->ses->capabilities & CAP_NT_SMBS) | |
276a74a4 | 408 | rc = CIFSSMBOpen(xid, tcon, full_path, disposition, |
5bafd765 | 409 | desiredAccess, CREATE_NOT_DIR, &netfid, &oplock, buf, |
737b758c SF |
410 | cifs_sb->local_nls, cifs_sb->mnt_cifs_flags |
411 | & CIFS_MOUNT_MAP_SPECIAL_CHR); | |
5bafd765 SF |
412 | else |
413 | rc = -EIO; /* no NT SMB support fall into legacy open below */ | |
414 | ||
a9d02ad4 SF |
415 | if (rc == -EIO) { |
416 | /* Old server, try legacy style OpenX */ | |
276a74a4 | 417 | rc = SMBLegacyOpen(xid, tcon, full_path, disposition, |
a9d02ad4 SF |
418 | desiredAccess, CREATE_NOT_DIR, &netfid, &oplock, buf, |
419 | cifs_sb->local_nls, cifs_sb->mnt_cifs_flags | |
420 | & CIFS_MOUNT_MAP_SPECIAL_CHR); | |
421 | } | |
1da177e4 | 422 | if (rc) { |
26a21b98 | 423 | cFYI(1, ("cifs_open returned 0x%x", rc)); |
1da177e4 LT |
424 | goto out; |
425 | } | |
426 | file->private_data = | |
427 | kmalloc(sizeof(struct cifsFileInfo), GFP_KERNEL); | |
428 | if (file->private_data == NULL) { | |
429 | rc = -ENOMEM; | |
430 | goto out; | |
431 | } | |
432 | pCifsFile = cifs_init_private(file->private_data, inode, file, netfid); | |
1da177e4 | 433 | write_lock(&GlobalSMBSeslock); |
276a74a4 | 434 | list_add(&pCifsFile->tlist, &tcon->openFileList); |
1da177e4 | 435 | |
e6a00296 | 436 | pCifsInode = CIFS_I(file->f_path.dentry->d_inode); |
1da177e4 LT |
437 | if (pCifsInode) { |
438 | rc = cifs_open_inode_helper(inode, file, pCifsInode, | |
276a74a4 | 439 | pCifsFile, tcon, |
1da177e4 LT |
440 | &oplock, buf, full_path, xid); |
441 | } else { | |
442 | write_unlock(&GlobalSMBSeslock); | |
1da177e4 LT |
443 | } |
444 | ||
fb8c4b14 | 445 | if (oplock & CIFS_CREATE_ACTION) { |
1da177e4 LT |
446 | /* time to set mode which we can not set earlier due to |
447 | problems creating new read-only files */ | |
276a74a4 | 448 | if (tcon->unix_ext) { |
4e1e7fb9 JL |
449 | struct cifs_unix_set_info_args args = { |
450 | .mode = inode->i_mode, | |
451 | .uid = NO_CHANGE_64, | |
452 | .gid = NO_CHANGE_64, | |
453 | .ctime = NO_CHANGE_64, | |
454 | .atime = NO_CHANGE_64, | |
455 | .mtime = NO_CHANGE_64, | |
456 | .device = 0, | |
457 | }; | |
276a74a4 | 458 | CIFSSMBUnixSetInfo(xid, tcon, full_path, &args, |
737b758c | 459 | cifs_sb->local_nls, |
fb8c4b14 | 460 | cifs_sb->mnt_cifs_flags & |
737b758c | 461 | CIFS_MOUNT_MAP_SPECIAL_CHR); |
1da177e4 LT |
462 | } |
463 | } | |
464 | ||
465 | out: | |
466 | kfree(buf); | |
467 | kfree(full_path); | |
468 | FreeXid(xid); | |
469 | return rc; | |
470 | } | |
471 | ||
0418726b | 472 | /* Try to reacquire byte range locks that were released when session */ |
1da177e4 LT |
473 | /* to server was lost */ |
474 | static int cifs_relock_file(struct cifsFileInfo *cifsFile) | |
475 | { | |
476 | int rc = 0; | |
477 | ||
478 | /* BB list all locks open on this file and relock */ | |
479 | ||
480 | return rc; | |
481 | } | |
482 | ||
4b18f2a9 | 483 | static int cifs_reopen_file(struct file *file, bool can_flush) |
1da177e4 LT |
484 | { |
485 | int rc = -EACCES; | |
486 | int xid, oplock; | |
487 | struct cifs_sb_info *cifs_sb; | |
7fc8f4e9 | 488 | struct cifsTconInfo *tcon; |
1da177e4 LT |
489 | struct cifsFileInfo *pCifsFile; |
490 | struct cifsInodeInfo *pCifsInode; | |
fb8c4b14 | 491 | struct inode *inode; |
1da177e4 LT |
492 | char *full_path = NULL; |
493 | int desiredAccess; | |
494 | int disposition = FILE_OPEN; | |
495 | __u16 netfid; | |
496 | ||
ad7a2926 | 497 | if (file->private_data) |
1da177e4 | 498 | pCifsFile = (struct cifsFileInfo *)file->private_data; |
ad7a2926 | 499 | else |
1da177e4 LT |
500 | return -EBADF; |
501 | ||
502 | xid = GetXid(); | |
503 | down(&pCifsFile->fh_sem); | |
4b18f2a9 | 504 | if (!pCifsFile->invalidHandle) { |
1da177e4 LT |
505 | up(&pCifsFile->fh_sem); |
506 | FreeXid(xid); | |
507 | return 0; | |
508 | } | |
509 | ||
e6a00296 | 510 | if (file->f_path.dentry == NULL) { |
3a9f462f SF |
511 | cERROR(1, ("no valid name if dentry freed")); |
512 | dump_stack(); | |
513 | rc = -EBADF; | |
514 | goto reopen_error_exit; | |
515 | } | |
516 | ||
517 | inode = file->f_path.dentry->d_inode; | |
fb8c4b14 | 518 | if (inode == NULL) { |
3a9f462f SF |
519 | cERROR(1, ("inode not valid")); |
520 | dump_stack(); | |
521 | rc = -EBADF; | |
522 | goto reopen_error_exit; | |
1da177e4 | 523 | } |
50c2f753 | 524 | |
1da177e4 | 525 | cifs_sb = CIFS_SB(inode->i_sb); |
7fc8f4e9 | 526 | tcon = cifs_sb->tcon; |
3a9f462f | 527 | |
1da177e4 LT |
528 | /* can not grab rename sem here because various ops, including |
529 | those that already have the rename sem can end up causing writepage | |
530 | to get called and if the server was down that means we end up here, | |
531 | and we can never tell if the caller already has the rename_sem */ | |
e6a00296 | 532 | full_path = build_path_from_dentry(file->f_path.dentry); |
1da177e4 | 533 | if (full_path == NULL) { |
3a9f462f SF |
534 | rc = -ENOMEM; |
535 | reopen_error_exit: | |
1da177e4 LT |
536 | up(&pCifsFile->fh_sem); |
537 | FreeXid(xid); | |
3a9f462f | 538 | return rc; |
1da177e4 LT |
539 | } |
540 | ||
3a9f462f | 541 | cFYI(1, ("inode = 0x%p file flags 0x%x for %s", |
fb8c4b14 | 542 | inode, file->f_flags, full_path)); |
1da177e4 LT |
543 | |
544 | if (oplockEnabled) | |
545 | oplock = REQ_OPLOCK; | |
546 | else | |
4b18f2a9 | 547 | oplock = 0; |
1da177e4 | 548 | |
7fc8f4e9 SF |
549 | if (tcon->unix_ext && (tcon->ses->capabilities & CAP_UNIX) && |
550 | (CIFS_UNIX_POSIX_PATH_OPS_CAP & | |
551 | le64_to_cpu(tcon->fsUnixInfo.Capability))) { | |
552 | int oflags = (int) cifs_posix_convert_flags(file->f_flags); | |
553 | /* can not refresh inode info since size could be stale */ | |
554 | rc = cifs_posix_open(full_path, NULL, inode->i_sb, | |
555 | cifs_sb->mnt_file_mode /* ignored */, | |
556 | oflags, &oplock, &netfid, xid); | |
557 | if (rc == 0) { | |
558 | cFYI(1, ("posix reopen succeeded")); | |
559 | goto reopen_success; | |
560 | } | |
561 | /* fallthrough to retry open the old way on errors, especially | |
562 | in the reconnect path it is important to retry hard */ | |
563 | } | |
564 | ||
565 | desiredAccess = cifs_convert_flags(file->f_flags); | |
566 | ||
1da177e4 | 567 | /* Can not refresh inode by passing in file_info buf to be returned |
fb8c4b14 SF |
568 | by SMBOpen and then calling get_inode_info with returned buf |
569 | since file might have write behind data that needs to be flushed | |
1da177e4 LT |
570 | and server version of file size can be stale. If we knew for sure |
571 | that inode was not dirty locally we could do this */ | |
572 | ||
7fc8f4e9 | 573 | rc = CIFSSMBOpen(xid, tcon, full_path, disposition, desiredAccess, |
1da177e4 | 574 | CREATE_NOT_DIR, &netfid, &oplock, NULL, |
fb8c4b14 | 575 | cifs_sb->local_nls, cifs_sb->mnt_cifs_flags & |
737b758c | 576 | CIFS_MOUNT_MAP_SPECIAL_CHR); |
1da177e4 LT |
577 | if (rc) { |
578 | up(&pCifsFile->fh_sem); | |
26a21b98 SF |
579 | cFYI(1, ("cifs_open returned 0x%x", rc)); |
580 | cFYI(1, ("oplock: %d", oplock)); | |
1da177e4 | 581 | } else { |
7fc8f4e9 | 582 | reopen_success: |
1da177e4 | 583 | pCifsFile->netfid = netfid; |
4b18f2a9 | 584 | pCifsFile->invalidHandle = false; |
1da177e4 LT |
585 | up(&pCifsFile->fh_sem); |
586 | pCifsInode = CIFS_I(inode); | |
587 | if (pCifsInode) { | |
588 | if (can_flush) { | |
cea21805 JL |
589 | rc = filemap_write_and_wait(inode->i_mapping); |
590 | if (rc != 0) | |
591 | CIFS_I(inode)->write_behind_rc = rc; | |
1da177e4 LT |
592 | /* temporarily disable caching while we |
593 | go to server to get inode info */ | |
4b18f2a9 SF |
594 | pCifsInode->clientCanCacheAll = false; |
595 | pCifsInode->clientCanCacheRead = false; | |
7fc8f4e9 | 596 | if (tcon->unix_ext) |
1da177e4 LT |
597 | rc = cifs_get_inode_info_unix(&inode, |
598 | full_path, inode->i_sb, xid); | |
599 | else | |
600 | rc = cifs_get_inode_info(&inode, | |
601 | full_path, NULL, inode->i_sb, | |
8b1327f6 | 602 | xid, NULL); |
1da177e4 LT |
603 | } /* else we are writing out data to server already |
604 | and could deadlock if we tried to flush data, and | |
605 | since we do not know if we have data that would | |
606 | invalidate the current end of file on the server | |
607 | we can not go to the server to get the new inod | |
608 | info */ | |
609 | if ((oplock & 0xF) == OPLOCK_EXCLUSIVE) { | |
4b18f2a9 SF |
610 | pCifsInode->clientCanCacheAll = true; |
611 | pCifsInode->clientCanCacheRead = true; | |
1da177e4 | 612 | cFYI(1, ("Exclusive Oplock granted on inode %p", |
e6a00296 | 613 | file->f_path.dentry->d_inode)); |
1da177e4 | 614 | } else if ((oplock & 0xF) == OPLOCK_READ) { |
4b18f2a9 SF |
615 | pCifsInode->clientCanCacheRead = true; |
616 | pCifsInode->clientCanCacheAll = false; | |
1da177e4 | 617 | } else { |
4b18f2a9 SF |
618 | pCifsInode->clientCanCacheRead = false; |
619 | pCifsInode->clientCanCacheAll = false; | |
1da177e4 LT |
620 | } |
621 | cifs_relock_file(pCifsFile); | |
622 | } | |
623 | } | |
1da177e4 LT |
624 | kfree(full_path); |
625 | FreeXid(xid); | |
626 | return rc; | |
627 | } | |
628 | ||
629 | int cifs_close(struct inode *inode, struct file *file) | |
630 | { | |
631 | int rc = 0; | |
15745320 | 632 | int xid, timeout; |
1da177e4 LT |
633 | struct cifs_sb_info *cifs_sb; |
634 | struct cifsTconInfo *pTcon; | |
635 | struct cifsFileInfo *pSMBFile = | |
636 | (struct cifsFileInfo *)file->private_data; | |
637 | ||
638 | xid = GetXid(); | |
639 | ||
640 | cifs_sb = CIFS_SB(inode->i_sb); | |
641 | pTcon = cifs_sb->tcon; | |
642 | if (pSMBFile) { | |
7ee1af76 | 643 | struct cifsLockInfo *li, *tmp; |
ddb4cbfc | 644 | write_lock(&GlobalSMBSeslock); |
4b18f2a9 | 645 | pSMBFile->closePend = true; |
1da177e4 LT |
646 | if (pTcon) { |
647 | /* no sense reconnecting to close a file that is | |
648 | already closed */ | |
3b795210 | 649 | if (!pTcon->need_reconnect) { |
ddb4cbfc | 650 | write_unlock(&GlobalSMBSeslock); |
15745320 | 651 | timeout = 2; |
fb8c4b14 | 652 | while ((atomic_read(&pSMBFile->wrtPending) != 0) |
15745320 | 653 | && (timeout <= 2048)) { |
23e7dd7d SF |
654 | /* Give write a better chance to get to |
655 | server ahead of the close. We do not | |
656 | want to add a wait_q here as it would | |
657 | increase the memory utilization as | |
658 | the struct would be in each open file, | |
fb8c4b14 | 659 | but this should give enough time to |
23e7dd7d | 660 | clear the socket */ |
90c81e0b SF |
661 | cFYI(DBG2, |
662 | ("close delay, write pending")); | |
23e7dd7d SF |
663 | msleep(timeout); |
664 | timeout *= 4; | |
4891d539 | 665 | } |
fb8c4b14 | 666 | if (atomic_read(&pSMBFile->wrtPending)) |
ddb4cbfc SF |
667 | cERROR(1, ("close with pending write")); |
668 | if (!pTcon->need_reconnect && | |
669 | !pSMBFile->invalidHandle) | |
670 | rc = CIFSSMBClose(xid, pTcon, | |
1da177e4 | 671 | pSMBFile->netfid); |
ddb4cbfc SF |
672 | } else |
673 | write_unlock(&GlobalSMBSeslock); | |
674 | } else | |
675 | write_unlock(&GlobalSMBSeslock); | |
7ee1af76 JA |
676 | |
677 | /* Delete any outstanding lock records. | |
678 | We'll lose them when the file is closed anyway. */ | |
796e5661 | 679 | mutex_lock(&pSMBFile->lock_mutex); |
7ee1af76 JA |
680 | list_for_each_entry_safe(li, tmp, &pSMBFile->llist, llist) { |
681 | list_del(&li->llist); | |
682 | kfree(li); | |
683 | } | |
796e5661 | 684 | mutex_unlock(&pSMBFile->lock_mutex); |
7ee1af76 | 685 | |
cbe0476f | 686 | write_lock(&GlobalSMBSeslock); |
1da177e4 LT |
687 | list_del(&pSMBFile->flist); |
688 | list_del(&pSMBFile->tlist); | |
cbe0476f | 689 | write_unlock(&GlobalSMBSeslock); |
15745320 SF |
690 | timeout = 10; |
691 | /* We waited above to give the SMBWrite a chance to issue | |
692 | on the wire (so we do not get SMBWrite returning EBADF | |
693 | if writepages is racing with close. Note that writepages | |
694 | does not specify a file handle, so it is possible for a file | |
695 | to be opened twice, and the application close the "wrong" | |
696 | file handle - in these cases we delay long enough to allow | |
697 | the SMBWrite to get on the wire before the SMB Close. | |
698 | We allow total wait here over 45 seconds, more than | |
699 | oplock break time, and more than enough to allow any write | |
700 | to complete on the server, or to time out on the client */ | |
701 | while ((atomic_read(&pSMBFile->wrtPending) != 0) | |
702 | && (timeout <= 50000)) { | |
703 | cERROR(1, ("writes pending, delay free of handle")); | |
704 | msleep(timeout); | |
705 | timeout *= 8; | |
706 | } | |
1da177e4 LT |
707 | kfree(file->private_data); |
708 | file->private_data = NULL; | |
709 | } else | |
710 | rc = -EBADF; | |
711 | ||
4efa53f0 | 712 | read_lock(&GlobalSMBSeslock); |
1da177e4 LT |
713 | if (list_empty(&(CIFS_I(inode)->openFileList))) { |
714 | cFYI(1, ("closing last open instance for inode %p", inode)); | |
715 | /* if the file is not open we do not know if we can cache info | |
716 | on this inode, much less write behind and read ahead */ | |
4b18f2a9 SF |
717 | CIFS_I(inode)->clientCanCacheRead = false; |
718 | CIFS_I(inode)->clientCanCacheAll = false; | |
1da177e4 | 719 | } |
4efa53f0 | 720 | read_unlock(&GlobalSMBSeslock); |
fb8c4b14 | 721 | if ((rc == 0) && CIFS_I(inode)->write_behind_rc) |
1da177e4 LT |
722 | rc = CIFS_I(inode)->write_behind_rc; |
723 | FreeXid(xid); | |
724 | return rc; | |
725 | } | |
726 | ||
727 | int cifs_closedir(struct inode *inode, struct file *file) | |
728 | { | |
729 | int rc = 0; | |
730 | int xid; | |
731 | struct cifsFileInfo *pCFileStruct = | |
732 | (struct cifsFileInfo *)file->private_data; | |
733 | char *ptmp; | |
734 | ||
26a21b98 | 735 | cFYI(1, ("Closedir inode = 0x%p", inode)); |
1da177e4 LT |
736 | |
737 | xid = GetXid(); | |
738 | ||
739 | if (pCFileStruct) { | |
740 | struct cifsTconInfo *pTcon; | |
fb8c4b14 SF |
741 | struct cifs_sb_info *cifs_sb = |
742 | CIFS_SB(file->f_path.dentry->d_sb); | |
1da177e4 LT |
743 | |
744 | pTcon = cifs_sb->tcon; | |
745 | ||
746 | cFYI(1, ("Freeing private data in close dir")); | |
ddb4cbfc | 747 | write_lock(&GlobalSMBSeslock); |
4b18f2a9 SF |
748 | if (!pCFileStruct->srch_inf.endOfSearch && |
749 | !pCFileStruct->invalidHandle) { | |
750 | pCFileStruct->invalidHandle = true; | |
ddb4cbfc | 751 | write_unlock(&GlobalSMBSeslock); |
1da177e4 LT |
752 | rc = CIFSFindClose(xid, pTcon, pCFileStruct->netfid); |
753 | cFYI(1, ("Closing uncompleted readdir with rc %d", | |
754 | rc)); | |
755 | /* not much we can do if it fails anyway, ignore rc */ | |
756 | rc = 0; | |
ddb4cbfc SF |
757 | } else |
758 | write_unlock(&GlobalSMBSeslock); | |
1da177e4 LT |
759 | ptmp = pCFileStruct->srch_inf.ntwrk_buf_start; |
760 | if (ptmp) { | |
ec637e3f | 761 | cFYI(1, ("closedir free smb buf in srch struct")); |
1da177e4 | 762 | pCFileStruct->srch_inf.ntwrk_buf_start = NULL; |
fb8c4b14 | 763 | if (pCFileStruct->srch_inf.smallBuf) |
d47d7c1a SF |
764 | cifs_small_buf_release(ptmp); |
765 | else | |
766 | cifs_buf_release(ptmp); | |
1da177e4 | 767 | } |
1da177e4 LT |
768 | kfree(file->private_data); |
769 | file->private_data = NULL; | |
770 | } | |
771 | /* BB can we lock the filestruct while this is going on? */ | |
772 | FreeXid(xid); | |
773 | return rc; | |
774 | } | |
775 | ||
7ee1af76 JA |
776 | static int store_file_lock(struct cifsFileInfo *fid, __u64 len, |
777 | __u64 offset, __u8 lockType) | |
778 | { | |
fb8c4b14 SF |
779 | struct cifsLockInfo *li = |
780 | kmalloc(sizeof(struct cifsLockInfo), GFP_KERNEL); | |
7ee1af76 JA |
781 | if (li == NULL) |
782 | return -ENOMEM; | |
783 | li->offset = offset; | |
784 | li->length = len; | |
785 | li->type = lockType; | |
796e5661 | 786 | mutex_lock(&fid->lock_mutex); |
7ee1af76 | 787 | list_add(&li->llist, &fid->llist); |
796e5661 | 788 | mutex_unlock(&fid->lock_mutex); |
7ee1af76 JA |
789 | return 0; |
790 | } | |
791 | ||
1da177e4 LT |
792 | int cifs_lock(struct file *file, int cmd, struct file_lock *pfLock) |
793 | { | |
794 | int rc, xid; | |
1da177e4 LT |
795 | __u32 numLock = 0; |
796 | __u32 numUnlock = 0; | |
797 | __u64 length; | |
4b18f2a9 | 798 | bool wait_flag = false; |
1da177e4 | 799 | struct cifs_sb_info *cifs_sb; |
13a6e42a | 800 | struct cifsTconInfo *tcon; |
08547b03 SF |
801 | __u16 netfid; |
802 | __u8 lockType = LOCKING_ANDX_LARGE_FILES; | |
13a6e42a | 803 | bool posix_locking = 0; |
1da177e4 LT |
804 | |
805 | length = 1 + pfLock->fl_end - pfLock->fl_start; | |
806 | rc = -EACCES; | |
807 | xid = GetXid(); | |
808 | ||
809 | cFYI(1, ("Lock parm: 0x%x flockflags: " | |
810 | "0x%x flocktype: 0x%x start: %lld end: %lld", | |
fb8c4b14 SF |
811 | cmd, pfLock->fl_flags, pfLock->fl_type, pfLock->fl_start, |
812 | pfLock->fl_end)); | |
1da177e4 LT |
813 | |
814 | if (pfLock->fl_flags & FL_POSIX) | |
d47d7c1a | 815 | cFYI(1, ("Posix")); |
1da177e4 | 816 | if (pfLock->fl_flags & FL_FLOCK) |
d47d7c1a | 817 | cFYI(1, ("Flock")); |
1da177e4 | 818 | if (pfLock->fl_flags & FL_SLEEP) { |
d47d7c1a | 819 | cFYI(1, ("Blocking lock")); |
4b18f2a9 | 820 | wait_flag = true; |
1da177e4 LT |
821 | } |
822 | if (pfLock->fl_flags & FL_ACCESS) | |
823 | cFYI(1, ("Process suspended by mandatory locking - " | |
26a21b98 | 824 | "not implemented yet")); |
1da177e4 LT |
825 | if (pfLock->fl_flags & FL_LEASE) |
826 | cFYI(1, ("Lease on file - not implemented yet")); | |
fb8c4b14 | 827 | if (pfLock->fl_flags & |
1da177e4 LT |
828 | (~(FL_POSIX | FL_FLOCK | FL_SLEEP | FL_ACCESS | FL_LEASE))) |
829 | cFYI(1, ("Unknown lock flags 0x%x", pfLock->fl_flags)); | |
830 | ||
831 | if (pfLock->fl_type == F_WRLCK) { | |
832 | cFYI(1, ("F_WRLCK ")); | |
833 | numLock = 1; | |
834 | } else if (pfLock->fl_type == F_UNLCK) { | |
d47d7c1a | 835 | cFYI(1, ("F_UNLCK")); |
1da177e4 | 836 | numUnlock = 1; |
d47d7c1a SF |
837 | /* Check if unlock includes more than |
838 | one lock range */ | |
1da177e4 | 839 | } else if (pfLock->fl_type == F_RDLCK) { |
d47d7c1a | 840 | cFYI(1, ("F_RDLCK")); |
1da177e4 LT |
841 | lockType |= LOCKING_ANDX_SHARED_LOCK; |
842 | numLock = 1; | |
843 | } else if (pfLock->fl_type == F_EXLCK) { | |
d47d7c1a | 844 | cFYI(1, ("F_EXLCK")); |
1da177e4 LT |
845 | numLock = 1; |
846 | } else if (pfLock->fl_type == F_SHLCK) { | |
d47d7c1a | 847 | cFYI(1, ("F_SHLCK")); |
1da177e4 LT |
848 | lockType |= LOCKING_ANDX_SHARED_LOCK; |
849 | numLock = 1; | |
850 | } else | |
d47d7c1a | 851 | cFYI(1, ("Unknown type of lock")); |
1da177e4 | 852 | |
e6a00296 | 853 | cifs_sb = CIFS_SB(file->f_path.dentry->d_sb); |
13a6e42a | 854 | tcon = cifs_sb->tcon; |
1da177e4 LT |
855 | |
856 | if (file->private_data == NULL) { | |
857 | FreeXid(xid); | |
858 | return -EBADF; | |
859 | } | |
08547b03 SF |
860 | netfid = ((struct cifsFileInfo *)file->private_data)->netfid; |
861 | ||
13a6e42a SF |
862 | if ((tcon->ses->capabilities & CAP_UNIX) && |
863 | (CIFS_UNIX_FCNTL_CAP & le64_to_cpu(tcon->fsUnixInfo.Capability)) && | |
acc18aa1 | 864 | ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NOPOSIXBRL) == 0)) |
13a6e42a | 865 | posix_locking = 1; |
08547b03 SF |
866 | /* BB add code here to normalize offset and length to |
867 | account for negative length which we can not accept over the | |
868 | wire */ | |
1da177e4 | 869 | if (IS_GETLK(cmd)) { |
fb8c4b14 | 870 | if (posix_locking) { |
08547b03 | 871 | int posix_lock_type; |
fb8c4b14 | 872 | if (lockType & LOCKING_ANDX_SHARED_LOCK) |
08547b03 SF |
873 | posix_lock_type = CIFS_RDLCK; |
874 | else | |
875 | posix_lock_type = CIFS_WRLCK; | |
13a6e42a | 876 | rc = CIFSSMBPosixLock(xid, tcon, netfid, 1 /* get */, |
fc94cdb9 | 877 | length, pfLock, |
08547b03 SF |
878 | posix_lock_type, wait_flag); |
879 | FreeXid(xid); | |
880 | return rc; | |
881 | } | |
882 | ||
883 | /* BB we could chain these into one lock request BB */ | |
13a6e42a | 884 | rc = CIFSSMBLock(xid, tcon, netfid, length, pfLock->fl_start, |
08547b03 | 885 | 0, 1, lockType, 0 /* wait flag */ ); |
1da177e4 | 886 | if (rc == 0) { |
13a6e42a | 887 | rc = CIFSSMBLock(xid, tcon, netfid, length, |
1da177e4 LT |
888 | pfLock->fl_start, 1 /* numUnlock */ , |
889 | 0 /* numLock */ , lockType, | |
890 | 0 /* wait flag */ ); | |
891 | pfLock->fl_type = F_UNLCK; | |
892 | if (rc != 0) | |
893 | cERROR(1, ("Error unlocking previously locked " | |
08547b03 | 894 | "range %d during test of lock", rc)); |
1da177e4 LT |
895 | rc = 0; |
896 | ||
897 | } else { | |
898 | /* if rc == ERR_SHARING_VIOLATION ? */ | |
899 | rc = 0; /* do not change lock type to unlock | |
900 | since range in use */ | |
901 | } | |
902 | ||
903 | FreeXid(xid); | |
904 | return rc; | |
905 | } | |
7ee1af76 JA |
906 | |
907 | if (!numLock && !numUnlock) { | |
908 | /* if no lock or unlock then nothing | |
909 | to do since we do not know what it is */ | |
910 | FreeXid(xid); | |
911 | return -EOPNOTSUPP; | |
912 | } | |
913 | ||
914 | if (posix_locking) { | |
08547b03 | 915 | int posix_lock_type; |
fb8c4b14 | 916 | if (lockType & LOCKING_ANDX_SHARED_LOCK) |
08547b03 SF |
917 | posix_lock_type = CIFS_RDLCK; |
918 | else | |
919 | posix_lock_type = CIFS_WRLCK; | |
50c2f753 | 920 | |
fb8c4b14 | 921 | if (numUnlock == 1) |
beb84dc8 | 922 | posix_lock_type = CIFS_UNLCK; |
7ee1af76 | 923 | |
13a6e42a | 924 | rc = CIFSSMBPosixLock(xid, tcon, netfid, 0 /* set */, |
fc94cdb9 | 925 | length, pfLock, |
08547b03 | 926 | posix_lock_type, wait_flag); |
7ee1af76 | 927 | } else { |
fb8c4b14 SF |
928 | struct cifsFileInfo *fid = |
929 | (struct cifsFileInfo *)file->private_data; | |
7ee1af76 JA |
930 | |
931 | if (numLock) { | |
13a6e42a | 932 | rc = CIFSSMBLock(xid, tcon, netfid, length, |
fb8c4b14 | 933 | pfLock->fl_start, |
7ee1af76 JA |
934 | 0, numLock, lockType, wait_flag); |
935 | ||
936 | if (rc == 0) { | |
937 | /* For Windows locks we must store them. */ | |
938 | rc = store_file_lock(fid, length, | |
939 | pfLock->fl_start, lockType); | |
940 | } | |
941 | } else if (numUnlock) { | |
942 | /* For each stored lock that this unlock overlaps | |
943 | completely, unlock it. */ | |
944 | int stored_rc = 0; | |
945 | struct cifsLockInfo *li, *tmp; | |
946 | ||
6b70c955 | 947 | rc = 0; |
796e5661 | 948 | mutex_lock(&fid->lock_mutex); |
7ee1af76 JA |
949 | list_for_each_entry_safe(li, tmp, &fid->llist, llist) { |
950 | if (pfLock->fl_start <= li->offset && | |
c19eb710 | 951 | (pfLock->fl_start + length) >= |
39db810c | 952 | (li->offset + li->length)) { |
13a6e42a | 953 | stored_rc = CIFSSMBLock(xid, tcon, |
fb8c4b14 | 954 | netfid, |
7ee1af76 | 955 | li->length, li->offset, |
4b18f2a9 | 956 | 1, 0, li->type, false); |
7ee1af76 JA |
957 | if (stored_rc) |
958 | rc = stored_rc; | |
959 | ||
960 | list_del(&li->llist); | |
961 | kfree(li); | |
962 | } | |
963 | } | |
796e5661 | 964 | mutex_unlock(&fid->lock_mutex); |
7ee1af76 JA |
965 | } |
966 | } | |
967 | ||
d634cc15 | 968 | if (pfLock->fl_flags & FL_POSIX) |
1da177e4 LT |
969 | posix_lock_file_wait(file, pfLock); |
970 | FreeXid(xid); | |
971 | return rc; | |
972 | } | |
973 | ||
fbec9ab9 JL |
974 | /* |
975 | * Set the timeout on write requests past EOF. For some servers (Windows) | |
976 | * these calls can be very long. | |
977 | * | |
978 | * If we're writing >10M past the EOF we give a 180s timeout. Anything less | |
979 | * than that gets a 45s timeout. Writes not past EOF get 15s timeouts. | |
980 | * The 10M cutoff is totally arbitrary. A better scheme for this would be | |
981 | * welcome if someone wants to suggest one. | |
982 | * | |
983 | * We may be able to do a better job with this if there were some way to | |
984 | * declare that a file should be sparse. | |
985 | */ | |
986 | static int | |
987 | cifs_write_timeout(struct cifsInodeInfo *cifsi, loff_t offset) | |
988 | { | |
989 | if (offset <= cifsi->server_eof) | |
990 | return CIFS_STD_OP; | |
991 | else if (offset > (cifsi->server_eof + (10 * 1024 * 1024))) | |
992 | return CIFS_VLONG_OP; | |
993 | else | |
994 | return CIFS_LONG_OP; | |
995 | } | |
996 | ||
997 | /* update the file size (if needed) after a write */ | |
998 | static void | |
999 | cifs_update_eof(struct cifsInodeInfo *cifsi, loff_t offset, | |
1000 | unsigned int bytes_written) | |
1001 | { | |
1002 | loff_t end_of_write = offset + bytes_written; | |
1003 | ||
1004 | if (end_of_write > cifsi->server_eof) | |
1005 | cifsi->server_eof = end_of_write; | |
1006 | } | |
1007 | ||
1da177e4 LT |
1008 | ssize_t cifs_user_write(struct file *file, const char __user *write_data, |
1009 | size_t write_size, loff_t *poffset) | |
1010 | { | |
1011 | int rc = 0; | |
1012 | unsigned int bytes_written = 0; | |
1013 | unsigned int total_written; | |
1014 | struct cifs_sb_info *cifs_sb; | |
1015 | struct cifsTconInfo *pTcon; | |
1016 | int xid, long_op; | |
1017 | struct cifsFileInfo *open_file; | |
fbec9ab9 | 1018 | struct cifsInodeInfo *cifsi = CIFS_I(file->f_path.dentry->d_inode); |
1da177e4 | 1019 | |
e6a00296 | 1020 | cifs_sb = CIFS_SB(file->f_path.dentry->d_sb); |
1da177e4 LT |
1021 | |
1022 | pTcon = cifs_sb->tcon; | |
1023 | ||
1024 | /* cFYI(1, | |
1025 | (" write %d bytes to offset %lld of %s", write_size, | |
e6a00296 | 1026 | *poffset, file->f_path.dentry->d_name.name)); */ |
1da177e4 LT |
1027 | |
1028 | if (file->private_data == NULL) | |
1029 | return -EBADF; | |
c33f8d32 | 1030 | open_file = (struct cifsFileInfo *) file->private_data; |
50c2f753 | 1031 | |
838726c4 JL |
1032 | rc = generic_write_checks(file, poffset, &write_size, 0); |
1033 | if (rc) | |
1034 | return rc; | |
1035 | ||
1da177e4 | 1036 | xid = GetXid(); |
1da177e4 | 1037 | |
fbec9ab9 | 1038 | long_op = cifs_write_timeout(cifsi, *poffset); |
1da177e4 LT |
1039 | for (total_written = 0; write_size > total_written; |
1040 | total_written += bytes_written) { | |
1041 | rc = -EAGAIN; | |
1042 | while (rc == -EAGAIN) { | |
1043 | if (file->private_data == NULL) { | |
1044 | /* file has been closed on us */ | |
1045 | FreeXid(xid); | |
1046 | /* if we have gotten here we have written some data | |
1047 | and blocked, and the file has been freed on us while | |
1048 | we blocked so return what we managed to write */ | |
1049 | return total_written; | |
fb8c4b14 | 1050 | } |
1da177e4 LT |
1051 | if (open_file->closePend) { |
1052 | FreeXid(xid); | |
1053 | if (total_written) | |
1054 | return total_written; | |
1055 | else | |
1056 | return -EBADF; | |
1057 | } | |
1058 | if (open_file->invalidHandle) { | |
1da177e4 LT |
1059 | /* we could deadlock if we called |
1060 | filemap_fdatawait from here so tell | |
1061 | reopen_file not to flush data to server | |
1062 | now */ | |
4b18f2a9 | 1063 | rc = cifs_reopen_file(file, false); |
1da177e4 LT |
1064 | if (rc != 0) |
1065 | break; | |
1066 | } | |
1067 | ||
1068 | rc = CIFSSMBWrite(xid, pTcon, | |
1069 | open_file->netfid, | |
1070 | min_t(const int, cifs_sb->wsize, | |
1071 | write_size - total_written), | |
1072 | *poffset, &bytes_written, | |
1073 | NULL, write_data + total_written, long_op); | |
1074 | } | |
1075 | if (rc || (bytes_written == 0)) { | |
1076 | if (total_written) | |
1077 | break; | |
1078 | else { | |
1079 | FreeXid(xid); | |
1080 | return rc; | |
1081 | } | |
fbec9ab9 JL |
1082 | } else { |
1083 | cifs_update_eof(cifsi, *poffset, bytes_written); | |
1da177e4 | 1084 | *poffset += bytes_written; |
fbec9ab9 | 1085 | } |
133672ef | 1086 | long_op = CIFS_STD_OP; /* subsequent writes fast - |
1da177e4 LT |
1087 | 15 seconds is plenty */ |
1088 | } | |
1089 | ||
a4544347 | 1090 | cifs_stats_bytes_written(pTcon, total_written); |
1da177e4 LT |
1091 | |
1092 | /* since the write may have blocked check these pointers again */ | |
3677db10 SF |
1093 | if ((file->f_path.dentry) && (file->f_path.dentry->d_inode)) { |
1094 | struct inode *inode = file->f_path.dentry->d_inode; | |
fb8c4b14 SF |
1095 | /* Do not update local mtime - server will set its actual value on write |
1096 | * inode->i_ctime = inode->i_mtime = | |
3677db10 SF |
1097 | * current_fs_time(inode->i_sb);*/ |
1098 | if (total_written > 0) { | |
1099 | spin_lock(&inode->i_lock); | |
1100 | if (*poffset > file->f_path.dentry->d_inode->i_size) | |
1101 | i_size_write(file->f_path.dentry->d_inode, | |
1da177e4 | 1102 | *poffset); |
3677db10 | 1103 | spin_unlock(&inode->i_lock); |
1da177e4 | 1104 | } |
fb8c4b14 | 1105 | mark_inode_dirty_sync(file->f_path.dentry->d_inode); |
1da177e4 LT |
1106 | } |
1107 | FreeXid(xid); | |
1108 | return total_written; | |
1109 | } | |
1110 | ||
1111 | static ssize_t cifs_write(struct file *file, const char *write_data, | |
d9414774 | 1112 | size_t write_size, loff_t *poffset) |
1da177e4 LT |
1113 | { |
1114 | int rc = 0; | |
1115 | unsigned int bytes_written = 0; | |
1116 | unsigned int total_written; | |
1117 | struct cifs_sb_info *cifs_sb; | |
1118 | struct cifsTconInfo *pTcon; | |
1119 | int xid, long_op; | |
1120 | struct cifsFileInfo *open_file; | |
fbec9ab9 | 1121 | struct cifsInodeInfo *cifsi = CIFS_I(file->f_path.dentry->d_inode); |
1da177e4 | 1122 | |
e6a00296 | 1123 | cifs_sb = CIFS_SB(file->f_path.dentry->d_sb); |
1da177e4 LT |
1124 | |
1125 | pTcon = cifs_sb->tcon; | |
1126 | ||
fb8c4b14 | 1127 | cFYI(1, ("write %zd bytes to offset %lld of %s", write_size, |
e6a00296 | 1128 | *poffset, file->f_path.dentry->d_name.name)); |
1da177e4 LT |
1129 | |
1130 | if (file->private_data == NULL) | |
1131 | return -EBADF; | |
c33f8d32 | 1132 | open_file = (struct cifsFileInfo *)file->private_data; |
50c2f753 | 1133 | |
1da177e4 | 1134 | xid = GetXid(); |
1da177e4 | 1135 | |
fbec9ab9 | 1136 | long_op = cifs_write_timeout(cifsi, *poffset); |
1da177e4 LT |
1137 | for (total_written = 0; write_size > total_written; |
1138 | total_written += bytes_written) { | |
1139 | rc = -EAGAIN; | |
1140 | while (rc == -EAGAIN) { | |
1141 | if (file->private_data == NULL) { | |
1142 | /* file has been closed on us */ | |
1143 | FreeXid(xid); | |
1144 | /* if we have gotten here we have written some data | |
1145 | and blocked, and the file has been freed on us | |
fb8c4b14 | 1146 | while we blocked so return what we managed to |
1da177e4 LT |
1147 | write */ |
1148 | return total_written; | |
fb8c4b14 | 1149 | } |
1da177e4 LT |
1150 | if (open_file->closePend) { |
1151 | FreeXid(xid); | |
1152 | if (total_written) | |
1153 | return total_written; | |
1154 | else | |
1155 | return -EBADF; | |
1156 | } | |
1157 | if (open_file->invalidHandle) { | |
1da177e4 LT |
1158 | /* we could deadlock if we called |
1159 | filemap_fdatawait from here so tell | |
fb8c4b14 | 1160 | reopen_file not to flush data to |
1da177e4 | 1161 | server now */ |
4b18f2a9 | 1162 | rc = cifs_reopen_file(file, false); |
1da177e4 LT |
1163 | if (rc != 0) |
1164 | break; | |
1165 | } | |
fb8c4b14 SF |
1166 | if (experimEnabled || (pTcon->ses->server && |
1167 | ((pTcon->ses->server->secMode & | |
08775834 | 1168 | (SECMODE_SIGN_REQUIRED | SECMODE_SIGN_ENABLED)) |
c01f36a8 | 1169 | == 0))) { |
3e84469d SF |
1170 | struct kvec iov[2]; |
1171 | unsigned int len; | |
1172 | ||
0ae0efad | 1173 | len = min((size_t)cifs_sb->wsize, |
3e84469d SF |
1174 | write_size - total_written); |
1175 | /* iov[0] is reserved for smb header */ | |
1176 | iov[1].iov_base = (char *)write_data + | |
1177 | total_written; | |
1178 | iov[1].iov_len = len; | |
d6e04ae6 | 1179 | rc = CIFSSMBWrite2(xid, pTcon, |
3e84469d | 1180 | open_file->netfid, len, |
d6e04ae6 | 1181 | *poffset, &bytes_written, |
3e84469d | 1182 | iov, 1, long_op); |
d6e04ae6 | 1183 | } else |
60808233 SF |
1184 | rc = CIFSSMBWrite(xid, pTcon, |
1185 | open_file->netfid, | |
1186 | min_t(const int, cifs_sb->wsize, | |
1187 | write_size - total_written), | |
1188 | *poffset, &bytes_written, | |
1189 | write_data + total_written, | |
1190 | NULL, long_op); | |
1da177e4 LT |
1191 | } |
1192 | if (rc || (bytes_written == 0)) { | |
1193 | if (total_written) | |
1194 | break; | |
1195 | else { | |
1196 | FreeXid(xid); | |
1197 | return rc; | |
1198 | } | |
fbec9ab9 JL |
1199 | } else { |
1200 | cifs_update_eof(cifsi, *poffset, bytes_written); | |
1da177e4 | 1201 | *poffset += bytes_written; |
fbec9ab9 | 1202 | } |
133672ef | 1203 | long_op = CIFS_STD_OP; /* subsequent writes fast - |
1da177e4 LT |
1204 | 15 seconds is plenty */ |
1205 | } | |
1206 | ||
a4544347 | 1207 | cifs_stats_bytes_written(pTcon, total_written); |
1da177e4 LT |
1208 | |
1209 | /* since the write may have blocked check these pointers again */ | |
3677db10 | 1210 | if ((file->f_path.dentry) && (file->f_path.dentry->d_inode)) { |
004c46b9 | 1211 | /*BB We could make this contingent on superblock ATIME flag too */ |
3677db10 SF |
1212 | /* file->f_path.dentry->d_inode->i_ctime = |
1213 | file->f_path.dentry->d_inode->i_mtime = CURRENT_TIME;*/ | |
1214 | if (total_written > 0) { | |
1215 | spin_lock(&file->f_path.dentry->d_inode->i_lock); | |
1216 | if (*poffset > file->f_path.dentry->d_inode->i_size) | |
1217 | i_size_write(file->f_path.dentry->d_inode, | |
1218 | *poffset); | |
1219 | spin_unlock(&file->f_path.dentry->d_inode->i_lock); | |
1da177e4 | 1220 | } |
3677db10 | 1221 | mark_inode_dirty_sync(file->f_path.dentry->d_inode); |
1da177e4 LT |
1222 | } |
1223 | FreeXid(xid); | |
1224 | return total_written; | |
1225 | } | |
1226 | ||
630f3f0c SF |
1227 | #ifdef CONFIG_CIFS_EXPERIMENTAL |
1228 | struct cifsFileInfo *find_readable_file(struct cifsInodeInfo *cifs_inode) | |
1229 | { | |
1230 | struct cifsFileInfo *open_file = NULL; | |
1231 | ||
1232 | read_lock(&GlobalSMBSeslock); | |
1233 | /* we could simply get the first_list_entry since write-only entries | |
1234 | are always at the end of the list but since the first entry might | |
1235 | have a close pending, we go through the whole list */ | |
1236 | list_for_each_entry(open_file, &cifs_inode->openFileList, flist) { | |
1237 | if (open_file->closePend) | |
1238 | continue; | |
1239 | if (open_file->pfile && ((open_file->pfile->f_flags & O_RDWR) || | |
1240 | (open_file->pfile->f_flags & O_RDONLY))) { | |
1241 | if (!open_file->invalidHandle) { | |
1242 | /* found a good file */ | |
1243 | /* lock it so it will not be closed on us */ | |
1244 | atomic_inc(&open_file->wrtPending); | |
1245 | read_unlock(&GlobalSMBSeslock); | |
1246 | return open_file; | |
1247 | } /* else might as well continue, and look for | |
1248 | another, or simply have the caller reopen it | |
1249 | again rather than trying to fix this handle */ | |
1250 | } else /* write only file */ | |
1251 | break; /* write only files are last so must be done */ | |
1252 | } | |
1253 | read_unlock(&GlobalSMBSeslock); | |
1254 | return NULL; | |
1255 | } | |
1256 | #endif | |
1257 | ||
dd99cd80 | 1258 | struct cifsFileInfo *find_writable_file(struct cifsInodeInfo *cifs_inode) |
6148a742 SF |
1259 | { |
1260 | struct cifsFileInfo *open_file; | |
2846d386 | 1261 | bool any_available = false; |
dd99cd80 | 1262 | int rc; |
6148a742 | 1263 | |
60808233 SF |
1264 | /* Having a null inode here (because mapping->host was set to zero by |
1265 | the VFS or MM) should not happen but we had reports of on oops (due to | |
1266 | it being zero) during stress testcases so we need to check for it */ | |
1267 | ||
fb8c4b14 SF |
1268 | if (cifs_inode == NULL) { |
1269 | cERROR(1, ("Null inode passed to cifs_writeable_file")); | |
60808233 SF |
1270 | dump_stack(); |
1271 | return NULL; | |
1272 | } | |
1273 | ||
6148a742 | 1274 | read_lock(&GlobalSMBSeslock); |
9b22b0b7 | 1275 | refind_writable: |
6148a742 | 1276 | list_for_each_entry(open_file, &cifs_inode->openFileList, flist) { |
2846d386 JL |
1277 | if (open_file->closePend || |
1278 | (!any_available && open_file->pid != current->tgid)) | |
6148a742 | 1279 | continue; |
2846d386 | 1280 | |
6148a742 SF |
1281 | if (open_file->pfile && |
1282 | ((open_file->pfile->f_flags & O_RDWR) || | |
1283 | (open_file->pfile->f_flags & O_WRONLY))) { | |
23e7dd7d | 1284 | atomic_inc(&open_file->wrtPending); |
9b22b0b7 SF |
1285 | |
1286 | if (!open_file->invalidHandle) { | |
1287 | /* found a good writable file */ | |
1288 | read_unlock(&GlobalSMBSeslock); | |
1289 | return open_file; | |
1290 | } | |
8840dee9 | 1291 | |
6148a742 | 1292 | read_unlock(&GlobalSMBSeslock); |
9b22b0b7 | 1293 | /* Had to unlock since following call can block */ |
4b18f2a9 | 1294 | rc = cifs_reopen_file(open_file->pfile, false); |
8840dee9 | 1295 | if (!rc) { |
9b22b0b7 SF |
1296 | if (!open_file->closePend) |
1297 | return open_file; | |
1298 | else { /* start over in case this was deleted */ | |
1299 | /* since the list could be modified */ | |
37c0eb46 | 1300 | read_lock(&GlobalSMBSeslock); |
15745320 | 1301 | atomic_dec(&open_file->wrtPending); |
9b22b0b7 | 1302 | goto refind_writable; |
37c0eb46 SF |
1303 | } |
1304 | } | |
9b22b0b7 SF |
1305 | |
1306 | /* if it fails, try another handle if possible - | |
1307 | (we can not do this if closePending since | |
1308 | loop could be modified - in which case we | |
1309 | have to start at the beginning of the list | |
1310 | again. Note that it would be bad | |
1311 | to hold up writepages here (rather than | |
1312 | in caller) with continuous retries */ | |
1313 | cFYI(1, ("wp failed on reopen file")); | |
1314 | read_lock(&GlobalSMBSeslock); | |
1315 | /* can not use this handle, no write | |
1316 | pending on this one after all */ | |
1317 | atomic_dec(&open_file->wrtPending); | |
8840dee9 | 1318 | |
9b22b0b7 SF |
1319 | if (open_file->closePend) /* list could have changed */ |
1320 | goto refind_writable; | |
1321 | /* else we simply continue to the next entry. Thus | |
1322 | we do not loop on reopen errors. If we | |
1323 | can not reopen the file, for example if we | |
1324 | reconnected to a server with another client | |
1325 | racing to delete or lock the file we would not | |
1326 | make progress if we restarted before the beginning | |
1327 | of the loop here. */ | |
6148a742 SF |
1328 | } |
1329 | } | |
2846d386 JL |
1330 | /* couldn't find useable FH with same pid, try any available */ |
1331 | if (!any_available) { | |
1332 | any_available = true; | |
1333 | goto refind_writable; | |
1334 | } | |
6148a742 SF |
1335 | read_unlock(&GlobalSMBSeslock); |
1336 | return NULL; | |
1337 | } | |
1338 | ||
1da177e4 LT |
1339 | static int cifs_partialpagewrite(struct page *page, unsigned from, unsigned to) |
1340 | { | |
1341 | struct address_space *mapping = page->mapping; | |
1342 | loff_t offset = (loff_t)page->index << PAGE_CACHE_SHIFT; | |
1343 | char *write_data; | |
1344 | int rc = -EFAULT; | |
1345 | int bytes_written = 0; | |
1346 | struct cifs_sb_info *cifs_sb; | |
1347 | struct cifsTconInfo *pTcon; | |
1348 | struct inode *inode; | |
6148a742 | 1349 | struct cifsFileInfo *open_file; |
1da177e4 LT |
1350 | |
1351 | if (!mapping || !mapping->host) | |
1352 | return -EFAULT; | |
1353 | ||
1354 | inode = page->mapping->host; | |
1355 | cifs_sb = CIFS_SB(inode->i_sb); | |
1356 | pTcon = cifs_sb->tcon; | |
1357 | ||
1358 | offset += (loff_t)from; | |
1359 | write_data = kmap(page); | |
1360 | write_data += from; | |
1361 | ||
1362 | if ((to > PAGE_CACHE_SIZE) || (from > to)) { | |
1363 | kunmap(page); | |
1364 | return -EIO; | |
1365 | } | |
1366 | ||
1367 | /* racing with truncate? */ | |
1368 | if (offset > mapping->host->i_size) { | |
1369 | kunmap(page); | |
1370 | return 0; /* don't care */ | |
1371 | } | |
1372 | ||
1373 | /* check to make sure that we are not extending the file */ | |
1374 | if (mapping->host->i_size - offset < (loff_t)to) | |
fb8c4b14 | 1375 | to = (unsigned)(mapping->host->i_size - offset); |
1da177e4 | 1376 | |
6148a742 SF |
1377 | open_file = find_writable_file(CIFS_I(mapping->host)); |
1378 | if (open_file) { | |
1379 | bytes_written = cifs_write(open_file->pfile, write_data, | |
1380 | to-from, &offset); | |
23e7dd7d | 1381 | atomic_dec(&open_file->wrtPending); |
1da177e4 | 1382 | /* Does mm or vfs already set times? */ |
6148a742 | 1383 | inode->i_atime = inode->i_mtime = current_fs_time(inode->i_sb); |
bb5a9a04 | 1384 | if ((bytes_written > 0) && (offset)) |
6148a742 | 1385 | rc = 0; |
bb5a9a04 SF |
1386 | else if (bytes_written < 0) |
1387 | rc = bytes_written; | |
6148a742 | 1388 | } else { |
1da177e4 LT |
1389 | cFYI(1, ("No writeable filehandles for inode")); |
1390 | rc = -EIO; | |
1391 | } | |
1392 | ||
1393 | kunmap(page); | |
1394 | return rc; | |
1395 | } | |
1396 | ||
1da177e4 | 1397 | static int cifs_writepages(struct address_space *mapping, |
37c0eb46 | 1398 | struct writeback_control *wbc) |
1da177e4 | 1399 | { |
37c0eb46 SF |
1400 | struct backing_dev_info *bdi = mapping->backing_dev_info; |
1401 | unsigned int bytes_to_write; | |
1402 | unsigned int bytes_written; | |
1403 | struct cifs_sb_info *cifs_sb; | |
1404 | int done = 0; | |
111ebb6e | 1405 | pgoff_t end; |
37c0eb46 | 1406 | pgoff_t index; |
fb8c4b14 SF |
1407 | int range_whole = 0; |
1408 | struct kvec *iov; | |
84d2f07e | 1409 | int len; |
37c0eb46 SF |
1410 | int n_iov = 0; |
1411 | pgoff_t next; | |
1412 | int nr_pages; | |
1413 | __u64 offset = 0; | |
23e7dd7d | 1414 | struct cifsFileInfo *open_file; |
fbec9ab9 | 1415 | struct cifsInodeInfo *cifsi = CIFS_I(mapping->host); |
37c0eb46 SF |
1416 | struct page *page; |
1417 | struct pagevec pvec; | |
1418 | int rc = 0; | |
1419 | int scanned = 0; | |
fbec9ab9 | 1420 | int xid, long_op; |
1da177e4 | 1421 | |
37c0eb46 | 1422 | cifs_sb = CIFS_SB(mapping->host->i_sb); |
50c2f753 | 1423 | |
37c0eb46 SF |
1424 | /* |
1425 | * If wsize is smaller that the page cache size, default to writing | |
1426 | * one page at a time via cifs_writepage | |
1427 | */ | |
1428 | if (cifs_sb->wsize < PAGE_CACHE_SIZE) | |
1429 | return generic_writepages(mapping, wbc); | |
1430 | ||
fb8c4b14 SF |
1431 | if ((cifs_sb->tcon->ses) && (cifs_sb->tcon->ses->server)) |
1432 | if (cifs_sb->tcon->ses->server->secMode & | |
1433 | (SECMODE_SIGN_REQUIRED | SECMODE_SIGN_ENABLED)) | |
1434 | if (!experimEnabled) | |
60808233 | 1435 | return generic_writepages(mapping, wbc); |
4a77118c | 1436 | |
9a0c8230 | 1437 | iov = kmalloc(32 * sizeof(struct kvec), GFP_KERNEL); |
fb8c4b14 | 1438 | if (iov == NULL) |
9a0c8230 SF |
1439 | return generic_writepages(mapping, wbc); |
1440 | ||
1441 | ||
37c0eb46 SF |
1442 | /* |
1443 | * BB: Is this meaningful for a non-block-device file system? | |
1444 | * If it is, we should test it again after we do I/O | |
1445 | */ | |
1446 | if (wbc->nonblocking && bdi_write_congested(bdi)) { | |
1447 | wbc->encountered_congestion = 1; | |
9a0c8230 | 1448 | kfree(iov); |
37c0eb46 SF |
1449 | return 0; |
1450 | } | |
1451 | ||
1da177e4 LT |
1452 | xid = GetXid(); |
1453 | ||
37c0eb46 | 1454 | pagevec_init(&pvec, 0); |
111ebb6e | 1455 | if (wbc->range_cyclic) { |
37c0eb46 | 1456 | index = mapping->writeback_index; /* Start from prev offset */ |
111ebb6e OH |
1457 | end = -1; |
1458 | } else { | |
1459 | index = wbc->range_start >> PAGE_CACHE_SHIFT; | |
1460 | end = wbc->range_end >> PAGE_CACHE_SHIFT; | |
1461 | if (wbc->range_start == 0 && wbc->range_end == LLONG_MAX) | |
1462 | range_whole = 1; | |
37c0eb46 SF |
1463 | scanned = 1; |
1464 | } | |
1465 | retry: | |
1466 | while (!done && (index <= end) && | |
1467 | (nr_pages = pagevec_lookup_tag(&pvec, mapping, &index, | |
1468 | PAGECACHE_TAG_DIRTY, | |
1469 | min(end - index, (pgoff_t)PAGEVEC_SIZE - 1) + 1))) { | |
1470 | int first; | |
1471 | unsigned int i; | |
1472 | ||
37c0eb46 SF |
1473 | first = -1; |
1474 | next = 0; | |
1475 | n_iov = 0; | |
1476 | bytes_to_write = 0; | |
1477 | ||
1478 | for (i = 0; i < nr_pages; i++) { | |
1479 | page = pvec.pages[i]; | |
1480 | /* | |
1481 | * At this point we hold neither mapping->tree_lock nor | |
1482 | * lock on the page itself: the page may be truncated or | |
1483 | * invalidated (changing page->mapping to NULL), or even | |
1484 | * swizzled back from swapper_space to tmpfs file | |
1485 | * mapping | |
1486 | */ | |
1487 | ||
1488 | if (first < 0) | |
1489 | lock_page(page); | |
529ae9aa | 1490 | else if (!trylock_page(page)) |
37c0eb46 SF |
1491 | break; |
1492 | ||
1493 | if (unlikely(page->mapping != mapping)) { | |
1494 | unlock_page(page); | |
1495 | break; | |
1496 | } | |
1497 | ||
111ebb6e | 1498 | if (!wbc->range_cyclic && page->index > end) { |
37c0eb46 SF |
1499 | done = 1; |
1500 | unlock_page(page); | |
1501 | break; | |
1502 | } | |
1503 | ||
1504 | if (next && (page->index != next)) { | |
1505 | /* Not next consecutive page */ | |
1506 | unlock_page(page); | |
1507 | break; | |
1508 | } | |
1509 | ||
1510 | if (wbc->sync_mode != WB_SYNC_NONE) | |
1511 | wait_on_page_writeback(page); | |
1512 | ||
1513 | if (PageWriteback(page) || | |
cb876f45 | 1514 | !clear_page_dirty_for_io(page)) { |
37c0eb46 SF |
1515 | unlock_page(page); |
1516 | break; | |
1517 | } | |
84d2f07e | 1518 | |
cb876f45 LT |
1519 | /* |
1520 | * This actually clears the dirty bit in the radix tree. | |
1521 | * See cifs_writepage() for more commentary. | |
1522 | */ | |
1523 | set_page_writeback(page); | |
1524 | ||
84d2f07e SF |
1525 | if (page_offset(page) >= mapping->host->i_size) { |
1526 | done = 1; | |
1527 | unlock_page(page); | |
cb876f45 | 1528 | end_page_writeback(page); |
84d2f07e SF |
1529 | break; |
1530 | } | |
1531 | ||
37c0eb46 SF |
1532 | /* |
1533 | * BB can we get rid of this? pages are held by pvec | |
1534 | */ | |
1535 | page_cache_get(page); | |
1536 | ||
84d2f07e SF |
1537 | len = min(mapping->host->i_size - page_offset(page), |
1538 | (loff_t)PAGE_CACHE_SIZE); | |
1539 | ||
37c0eb46 SF |
1540 | /* reserve iov[0] for the smb header */ |
1541 | n_iov++; | |
1542 | iov[n_iov].iov_base = kmap(page); | |
84d2f07e SF |
1543 | iov[n_iov].iov_len = len; |
1544 | bytes_to_write += len; | |
37c0eb46 SF |
1545 | |
1546 | if (first < 0) { | |
1547 | first = i; | |
1548 | offset = page_offset(page); | |
1549 | } | |
1550 | next = page->index + 1; | |
1551 | if (bytes_to_write + PAGE_CACHE_SIZE > cifs_sb->wsize) | |
1552 | break; | |
1553 | } | |
1554 | if (n_iov) { | |
23e7dd7d SF |
1555 | /* Search for a writable handle every time we call |
1556 | * CIFSSMBWrite2. We can't rely on the last handle | |
1557 | * we used to still be valid | |
1558 | */ | |
1559 | open_file = find_writable_file(CIFS_I(mapping->host)); | |
1560 | if (!open_file) { | |
1561 | cERROR(1, ("No writable handles for inode")); | |
1562 | rc = -EBADF; | |
1047abc1 | 1563 | } else { |
fbec9ab9 | 1564 | long_op = cifs_write_timeout(cifsi, offset); |
23e7dd7d SF |
1565 | rc = CIFSSMBWrite2(xid, cifs_sb->tcon, |
1566 | open_file->netfid, | |
1567 | bytes_to_write, offset, | |
1568 | &bytes_written, iov, n_iov, | |
fbec9ab9 | 1569 | long_op); |
23e7dd7d | 1570 | atomic_dec(&open_file->wrtPending); |
fbec9ab9 JL |
1571 | cifs_update_eof(cifsi, offset, bytes_written); |
1572 | ||
23e7dd7d | 1573 | if (rc || bytes_written < bytes_to_write) { |
63135e08 | 1574 | cERROR(1, ("Write2 ret %d, wrote %d", |
23e7dd7d SF |
1575 | rc, bytes_written)); |
1576 | /* BB what if continued retry is | |
1577 | requested via mount flags? */ | |
cea21805 JL |
1578 | if (rc == -ENOSPC) |
1579 | set_bit(AS_ENOSPC, &mapping->flags); | |
1580 | else | |
1581 | set_bit(AS_EIO, &mapping->flags); | |
23e7dd7d SF |
1582 | } else { |
1583 | cifs_stats_bytes_written(cifs_sb->tcon, | |
1584 | bytes_written); | |
1585 | } | |
37c0eb46 SF |
1586 | } |
1587 | for (i = 0; i < n_iov; i++) { | |
1588 | page = pvec.pages[first + i]; | |
eb9bdaa3 SF |
1589 | /* Should we also set page error on |
1590 | success rc but too little data written? */ | |
1591 | /* BB investigate retry logic on temporary | |
1592 | server crash cases and how recovery works | |
fb8c4b14 SF |
1593 | when page marked as error */ |
1594 | if (rc) | |
eb9bdaa3 | 1595 | SetPageError(page); |
37c0eb46 SF |
1596 | kunmap(page); |
1597 | unlock_page(page); | |
cb876f45 | 1598 | end_page_writeback(page); |
37c0eb46 SF |
1599 | page_cache_release(page); |
1600 | } | |
1601 | if ((wbc->nr_to_write -= n_iov) <= 0) | |
1602 | done = 1; | |
1603 | index = next; | |
b066a48c DK |
1604 | } else |
1605 | /* Need to re-find the pages we skipped */ | |
1606 | index = pvec.pages[0]->index + 1; | |
1607 | ||
37c0eb46 SF |
1608 | pagevec_release(&pvec); |
1609 | } | |
1610 | if (!scanned && !done) { | |
1611 | /* | |
1612 | * We hit the last page and there is more work to be done: wrap | |
1613 | * back to the start of the file | |
1614 | */ | |
1615 | scanned = 1; | |
1616 | index = 0; | |
1617 | goto retry; | |
1618 | } | |
111ebb6e | 1619 | if (wbc->range_cyclic || (range_whole && wbc->nr_to_write > 0)) |
37c0eb46 SF |
1620 | mapping->writeback_index = index; |
1621 | ||
1da177e4 | 1622 | FreeXid(xid); |
9a0c8230 | 1623 | kfree(iov); |
1da177e4 LT |
1624 | return rc; |
1625 | } | |
1da177e4 | 1626 | |
fb8c4b14 | 1627 | static int cifs_writepage(struct page *page, struct writeback_control *wbc) |
1da177e4 LT |
1628 | { |
1629 | int rc = -EFAULT; | |
1630 | int xid; | |
1631 | ||
1632 | xid = GetXid(); | |
1633 | /* BB add check for wbc flags */ | |
1634 | page_cache_get(page); | |
ad7a2926 | 1635 | if (!PageUptodate(page)) |
1da177e4 | 1636 | cFYI(1, ("ppw - page not up to date")); |
cb876f45 LT |
1637 | |
1638 | /* | |
1639 | * Set the "writeback" flag, and clear "dirty" in the radix tree. | |
1640 | * | |
1641 | * A writepage() implementation always needs to do either this, | |
1642 | * or re-dirty the page with "redirty_page_for_writepage()" in | |
1643 | * the case of a failure. | |
1644 | * | |
1645 | * Just unlocking the page will cause the radix tree tag-bits | |
1646 | * to fail to update with the state of the page correctly. | |
1647 | */ | |
fb8c4b14 | 1648 | set_page_writeback(page); |
1da177e4 LT |
1649 | rc = cifs_partialpagewrite(page, 0, PAGE_CACHE_SIZE); |
1650 | SetPageUptodate(page); /* BB add check for error and Clearuptodate? */ | |
1651 | unlock_page(page); | |
cb876f45 LT |
1652 | end_page_writeback(page); |
1653 | page_cache_release(page); | |
1da177e4 LT |
1654 | FreeXid(xid); |
1655 | return rc; | |
1656 | } | |
1657 | ||
d9414774 NP |
1658 | static int cifs_write_end(struct file *file, struct address_space *mapping, |
1659 | loff_t pos, unsigned len, unsigned copied, | |
1660 | struct page *page, void *fsdata) | |
1da177e4 | 1661 | { |
d9414774 NP |
1662 | int rc; |
1663 | struct inode *inode = mapping->host; | |
1da177e4 | 1664 | |
d9414774 NP |
1665 | cFYI(1, ("write_end for page %p from pos %lld with %d bytes", |
1666 | page, pos, copied)); | |
1667 | ||
a98ee8c1 JL |
1668 | if (PageChecked(page)) { |
1669 | if (copied == len) | |
1670 | SetPageUptodate(page); | |
1671 | ClearPageChecked(page); | |
1672 | } else if (!PageUptodate(page) && copied == PAGE_CACHE_SIZE) | |
d9414774 | 1673 | SetPageUptodate(page); |
ad7a2926 | 1674 | |
1da177e4 | 1675 | if (!PageUptodate(page)) { |
d9414774 NP |
1676 | char *page_data; |
1677 | unsigned offset = pos & (PAGE_CACHE_SIZE - 1); | |
1678 | int xid; | |
1679 | ||
1680 | xid = GetXid(); | |
1da177e4 LT |
1681 | /* this is probably better than directly calling |
1682 | partialpage_write since in this function the file handle is | |
1683 | known which we might as well leverage */ | |
1684 | /* BB check if anything else missing out of ppw | |
1685 | such as updating last write time */ | |
1686 | page_data = kmap(page); | |
d9414774 NP |
1687 | rc = cifs_write(file, page_data + offset, copied, &pos); |
1688 | /* if (rc < 0) should we set writebehind rc? */ | |
1da177e4 | 1689 | kunmap(page); |
d9414774 NP |
1690 | |
1691 | FreeXid(xid); | |
fb8c4b14 | 1692 | } else { |
d9414774 NP |
1693 | rc = copied; |
1694 | pos += copied; | |
1da177e4 LT |
1695 | set_page_dirty(page); |
1696 | } | |
1697 | ||
d9414774 NP |
1698 | if (rc > 0) { |
1699 | spin_lock(&inode->i_lock); | |
1700 | if (pos > inode->i_size) | |
1701 | i_size_write(inode, pos); | |
1702 | spin_unlock(&inode->i_lock); | |
1703 | } | |
1704 | ||
1705 | unlock_page(page); | |
1706 | page_cache_release(page); | |
1707 | ||
1da177e4 LT |
1708 | return rc; |
1709 | } | |
1710 | ||
1711 | int cifs_fsync(struct file *file, struct dentry *dentry, int datasync) | |
1712 | { | |
1713 | int xid; | |
1714 | int rc = 0; | |
b298f223 SF |
1715 | struct cifsTconInfo *tcon; |
1716 | struct cifsFileInfo *smbfile = | |
1717 | (struct cifsFileInfo *)file->private_data; | |
e6a00296 | 1718 | struct inode *inode = file->f_path.dentry->d_inode; |
1da177e4 LT |
1719 | |
1720 | xid = GetXid(); | |
1721 | ||
fb8c4b14 | 1722 | cFYI(1, ("Sync file - name: %s datasync: 0x%x", |
1da177e4 | 1723 | dentry->d_name.name, datasync)); |
50c2f753 | 1724 | |
cea21805 JL |
1725 | rc = filemap_write_and_wait(inode->i_mapping); |
1726 | if (rc == 0) { | |
1727 | rc = CIFS_I(inode)->write_behind_rc; | |
1da177e4 | 1728 | CIFS_I(inode)->write_behind_rc = 0; |
b298f223 | 1729 | tcon = CIFS_SB(inode->i_sb)->tcon; |
be652445 | 1730 | if (!rc && tcon && smbfile && |
4717bed6 | 1731 | !(CIFS_SB(inode->i_sb)->mnt_cifs_flags & CIFS_MOUNT_NOSSYNC)) |
b298f223 | 1732 | rc = CIFSSMBFlush(xid, tcon, smbfile->netfid); |
cea21805 | 1733 | } |
b298f223 | 1734 | |
1da177e4 LT |
1735 | FreeXid(xid); |
1736 | return rc; | |
1737 | } | |
1738 | ||
3978d717 | 1739 | /* static void cifs_sync_page(struct page *page) |
1da177e4 LT |
1740 | { |
1741 | struct address_space *mapping; | |
1742 | struct inode *inode; | |
1743 | unsigned long index = page->index; | |
1744 | unsigned int rpages = 0; | |
1745 | int rc = 0; | |
1746 | ||
1747 | cFYI(1, ("sync page %p",page)); | |
1748 | mapping = page->mapping; | |
1749 | if (!mapping) | |
1750 | return 0; | |
1751 | inode = mapping->host; | |
1752 | if (!inode) | |
3978d717 | 1753 | return; */ |
1da177e4 | 1754 | |
fb8c4b14 | 1755 | /* fill in rpages then |
1da177e4 LT |
1756 | result = cifs_pagein_inode(inode, index, rpages); */ /* BB finish */ |
1757 | ||
26a21b98 | 1758 | /* cFYI(1, ("rpages is %d for sync page of Index %ld", rpages, index)); |
1da177e4 | 1759 | |
3978d717 | 1760 | #if 0 |
1da177e4 LT |
1761 | if (rc < 0) |
1762 | return rc; | |
1763 | return 0; | |
3978d717 | 1764 | #endif |
1da177e4 LT |
1765 | } */ |
1766 | ||
1767 | /* | |
1768 | * As file closes, flush all cached write data for this inode checking | |
1769 | * for write behind errors. | |
1770 | */ | |
75e1fcc0 | 1771 | int cifs_flush(struct file *file, fl_owner_t id) |
1da177e4 | 1772 | { |
fb8c4b14 | 1773 | struct inode *inode = file->f_path.dentry->d_inode; |
1da177e4 LT |
1774 | int rc = 0; |
1775 | ||
1776 | /* Rather than do the steps manually: | |
1777 | lock the inode for writing | |
1778 | loop through pages looking for write behind data (dirty pages) | |
1779 | coalesce into contiguous 16K (or smaller) chunks to write to server | |
1780 | send to server (prefer in parallel) | |
1781 | deal with writebehind errors | |
1782 | unlock inode for writing | |
1783 | filemapfdatawrite appears easier for the time being */ | |
1784 | ||
1785 | rc = filemap_fdatawrite(inode->i_mapping); | |
cea21805 JL |
1786 | /* reset wb rc if we were able to write out dirty pages */ |
1787 | if (!rc) { | |
1788 | rc = CIFS_I(inode)->write_behind_rc; | |
1da177e4 | 1789 | CIFS_I(inode)->write_behind_rc = 0; |
cea21805 | 1790 | } |
50c2f753 | 1791 | |
fb8c4b14 | 1792 | cFYI(1, ("Flush inode %p file %p rc %d", inode, file, rc)); |
1da177e4 LT |
1793 | |
1794 | return rc; | |
1795 | } | |
1796 | ||
1797 | ssize_t cifs_user_read(struct file *file, char __user *read_data, | |
1798 | size_t read_size, loff_t *poffset) | |
1799 | { | |
1800 | int rc = -EACCES; | |
1801 | unsigned int bytes_read = 0; | |
1802 | unsigned int total_read = 0; | |
1803 | unsigned int current_read_size; | |
1804 | struct cifs_sb_info *cifs_sb; | |
1805 | struct cifsTconInfo *pTcon; | |
1806 | int xid; | |
1807 | struct cifsFileInfo *open_file; | |
1808 | char *smb_read_data; | |
1809 | char __user *current_offset; | |
1810 | struct smb_com_read_rsp *pSMBr; | |
1811 | ||
1812 | xid = GetXid(); | |
e6a00296 | 1813 | cifs_sb = CIFS_SB(file->f_path.dentry->d_sb); |
1da177e4 LT |
1814 | pTcon = cifs_sb->tcon; |
1815 | ||
1816 | if (file->private_data == NULL) { | |
1817 | FreeXid(xid); | |
1818 | return -EBADF; | |
1819 | } | |
1820 | open_file = (struct cifsFileInfo *)file->private_data; | |
1821 | ||
ad7a2926 | 1822 | if ((file->f_flags & O_ACCMODE) == O_WRONLY) |
1da177e4 | 1823 | cFYI(1, ("attempting read on write only file instance")); |
ad7a2926 | 1824 | |
1da177e4 LT |
1825 | for (total_read = 0, current_offset = read_data; |
1826 | read_size > total_read; | |
1827 | total_read += bytes_read, current_offset += bytes_read) { | |
fb8c4b14 | 1828 | current_read_size = min_t(const int, read_size - total_read, |
1da177e4 LT |
1829 | cifs_sb->rsize); |
1830 | rc = -EAGAIN; | |
1831 | smb_read_data = NULL; | |
1832 | while (rc == -EAGAIN) { | |
ec637e3f | 1833 | int buf_type = CIFS_NO_BUFFER; |
fb8c4b14 | 1834 | if ((open_file->invalidHandle) && |
1da177e4 | 1835 | (!open_file->closePend)) { |
4b18f2a9 | 1836 | rc = cifs_reopen_file(file, true); |
1da177e4 LT |
1837 | if (rc != 0) |
1838 | break; | |
1839 | } | |
bfa0d75a | 1840 | rc = CIFSSMBRead(xid, pTcon, |
ec637e3f SF |
1841 | open_file->netfid, |
1842 | current_read_size, *poffset, | |
1843 | &bytes_read, &smb_read_data, | |
1844 | &buf_type); | |
1da177e4 | 1845 | pSMBr = (struct smb_com_read_rsp *)smb_read_data; |
1da177e4 | 1846 | if (smb_read_data) { |
93544cc6 SF |
1847 | if (copy_to_user(current_offset, |
1848 | smb_read_data + | |
1849 | 4 /* RFC1001 length field */ + | |
1850 | le16_to_cpu(pSMBr->DataOffset), | |
ad7a2926 | 1851 | bytes_read)) |
93544cc6 | 1852 | rc = -EFAULT; |
93544cc6 | 1853 | |
fb8c4b14 | 1854 | if (buf_type == CIFS_SMALL_BUFFER) |
ec637e3f | 1855 | cifs_small_buf_release(smb_read_data); |
fb8c4b14 | 1856 | else if (buf_type == CIFS_LARGE_BUFFER) |
ec637e3f | 1857 | cifs_buf_release(smb_read_data); |
1da177e4 LT |
1858 | smb_read_data = NULL; |
1859 | } | |
1860 | } | |
1861 | if (rc || (bytes_read == 0)) { | |
1862 | if (total_read) { | |
1863 | break; | |
1864 | } else { | |
1865 | FreeXid(xid); | |
1866 | return rc; | |
1867 | } | |
1868 | } else { | |
a4544347 | 1869 | cifs_stats_bytes_read(pTcon, bytes_read); |
1da177e4 LT |
1870 | *poffset += bytes_read; |
1871 | } | |
1872 | } | |
1873 | FreeXid(xid); | |
1874 | return total_read; | |
1875 | } | |
1876 | ||
1877 | ||
1878 | static ssize_t cifs_read(struct file *file, char *read_data, size_t read_size, | |
1879 | loff_t *poffset) | |
1880 | { | |
1881 | int rc = -EACCES; | |
1882 | unsigned int bytes_read = 0; | |
1883 | unsigned int total_read; | |
1884 | unsigned int current_read_size; | |
1885 | struct cifs_sb_info *cifs_sb; | |
1886 | struct cifsTconInfo *pTcon; | |
1887 | int xid; | |
1888 | char *current_offset; | |
1889 | struct cifsFileInfo *open_file; | |
ec637e3f | 1890 | int buf_type = CIFS_NO_BUFFER; |
1da177e4 LT |
1891 | |
1892 | xid = GetXid(); | |
e6a00296 | 1893 | cifs_sb = CIFS_SB(file->f_path.dentry->d_sb); |
1da177e4 LT |
1894 | pTcon = cifs_sb->tcon; |
1895 | ||
1896 | if (file->private_data == NULL) { | |
1897 | FreeXid(xid); | |
1898 | return -EBADF; | |
1899 | } | |
1900 | open_file = (struct cifsFileInfo *)file->private_data; | |
1901 | ||
1902 | if ((file->f_flags & O_ACCMODE) == O_WRONLY) | |
1903 | cFYI(1, ("attempting read on write only file instance")); | |
1904 | ||
fb8c4b14 | 1905 | for (total_read = 0, current_offset = read_data; |
1da177e4 LT |
1906 | read_size > total_read; |
1907 | total_read += bytes_read, current_offset += bytes_read) { | |
1908 | current_read_size = min_t(const int, read_size - total_read, | |
1909 | cifs_sb->rsize); | |
f9f5c817 SF |
1910 | /* For windows me and 9x we do not want to request more |
1911 | than it negotiated since it will refuse the read then */ | |
fb8c4b14 | 1912 | if ((pTcon->ses) && |
f9f5c817 SF |
1913 | !(pTcon->ses->capabilities & CAP_LARGE_FILES)) { |
1914 | current_read_size = min_t(const int, current_read_size, | |
1915 | pTcon->ses->server->maxBuf - 128); | |
1916 | } | |
1da177e4 LT |
1917 | rc = -EAGAIN; |
1918 | while (rc == -EAGAIN) { | |
fb8c4b14 | 1919 | if ((open_file->invalidHandle) && |
1da177e4 | 1920 | (!open_file->closePend)) { |
4b18f2a9 | 1921 | rc = cifs_reopen_file(file, true); |
1da177e4 LT |
1922 | if (rc != 0) |
1923 | break; | |
1924 | } | |
bfa0d75a | 1925 | rc = CIFSSMBRead(xid, pTcon, |
ec637e3f SF |
1926 | open_file->netfid, |
1927 | current_read_size, *poffset, | |
1928 | &bytes_read, ¤t_offset, | |
1929 | &buf_type); | |
1da177e4 LT |
1930 | } |
1931 | if (rc || (bytes_read == 0)) { | |
1932 | if (total_read) { | |
1933 | break; | |
1934 | } else { | |
1935 | FreeXid(xid); | |
1936 | return rc; | |
1937 | } | |
1938 | } else { | |
a4544347 | 1939 | cifs_stats_bytes_read(pTcon, total_read); |
1da177e4 LT |
1940 | *poffset += bytes_read; |
1941 | } | |
1942 | } | |
1943 | FreeXid(xid); | |
1944 | return total_read; | |
1945 | } | |
1946 | ||
1947 | int cifs_file_mmap(struct file *file, struct vm_area_struct *vma) | |
1948 | { | |
e6a00296 | 1949 | struct dentry *dentry = file->f_path.dentry; |
1da177e4 LT |
1950 | int rc, xid; |
1951 | ||
1952 | xid = GetXid(); | |
1953 | rc = cifs_revalidate(dentry); | |
1954 | if (rc) { | |
1955 | cFYI(1, ("Validation prior to mmap failed, error=%d", rc)); | |
1956 | FreeXid(xid); | |
1957 | return rc; | |
1958 | } | |
1959 | rc = generic_file_mmap(file, vma); | |
1960 | FreeXid(xid); | |
1961 | return rc; | |
1962 | } | |
1963 | ||
1964 | ||
fb8c4b14 | 1965 | static void cifs_copy_cache_pages(struct address_space *mapping, |
1da177e4 LT |
1966 | struct list_head *pages, int bytes_read, char *data, |
1967 | struct pagevec *plru_pvec) | |
1968 | { | |
1969 | struct page *page; | |
1970 | char *target; | |
1971 | ||
1972 | while (bytes_read > 0) { | |
1973 | if (list_empty(pages)) | |
1974 | break; | |
1975 | ||
1976 | page = list_entry(pages->prev, struct page, lru); | |
1977 | list_del(&page->lru); | |
1978 | ||
1979 | if (add_to_page_cache(page, mapping, page->index, | |
1980 | GFP_KERNEL)) { | |
1981 | page_cache_release(page); | |
1982 | cFYI(1, ("Add page cache failed")); | |
3079ca62 SF |
1983 | data += PAGE_CACHE_SIZE; |
1984 | bytes_read -= PAGE_CACHE_SIZE; | |
1da177e4 LT |
1985 | continue; |
1986 | } | |
1987 | ||
fb8c4b14 | 1988 | target = kmap_atomic(page, KM_USER0); |
1da177e4 LT |
1989 | |
1990 | if (PAGE_CACHE_SIZE > bytes_read) { | |
1991 | memcpy(target, data, bytes_read); | |
1992 | /* zero the tail end of this partial page */ | |
fb8c4b14 | 1993 | memset(target + bytes_read, 0, |
1da177e4 LT |
1994 | PAGE_CACHE_SIZE - bytes_read); |
1995 | bytes_read = 0; | |
1996 | } else { | |
1997 | memcpy(target, data, PAGE_CACHE_SIZE); | |
1998 | bytes_read -= PAGE_CACHE_SIZE; | |
1999 | } | |
2000 | kunmap_atomic(target, KM_USER0); | |
2001 | ||
2002 | flush_dcache_page(page); | |
2003 | SetPageUptodate(page); | |
2004 | unlock_page(page); | |
2005 | if (!pagevec_add(plru_pvec, page)) | |
4f98a2fe | 2006 | __pagevec_lru_add_file(plru_pvec); |
1da177e4 LT |
2007 | data += PAGE_CACHE_SIZE; |
2008 | } | |
2009 | return; | |
2010 | } | |
2011 | ||
2012 | static int cifs_readpages(struct file *file, struct address_space *mapping, | |
2013 | struct list_head *page_list, unsigned num_pages) | |
2014 | { | |
2015 | int rc = -EACCES; | |
2016 | int xid; | |
2017 | loff_t offset; | |
2018 | struct page *page; | |
2019 | struct cifs_sb_info *cifs_sb; | |
2020 | struct cifsTconInfo *pTcon; | |
2c2130e1 | 2021 | unsigned int bytes_read = 0; |
fb8c4b14 | 2022 | unsigned int read_size, i; |
1da177e4 LT |
2023 | char *smb_read_data = NULL; |
2024 | struct smb_com_read_rsp *pSMBr; | |
2025 | struct pagevec lru_pvec; | |
2026 | struct cifsFileInfo *open_file; | |
ec637e3f | 2027 | int buf_type = CIFS_NO_BUFFER; |
1da177e4 LT |
2028 | |
2029 | xid = GetXid(); | |
2030 | if (file->private_data == NULL) { | |
2031 | FreeXid(xid); | |
2032 | return -EBADF; | |
2033 | } | |
2034 | open_file = (struct cifsFileInfo *)file->private_data; | |
e6a00296 | 2035 | cifs_sb = CIFS_SB(file->f_path.dentry->d_sb); |
1da177e4 | 2036 | pTcon = cifs_sb->tcon; |
bfa0d75a | 2037 | |
1da177e4 | 2038 | pagevec_init(&lru_pvec, 0); |
61de800d | 2039 | cFYI(DBG2, ("rpages: num pages %d", num_pages)); |
1da177e4 LT |
2040 | for (i = 0; i < num_pages; ) { |
2041 | unsigned contig_pages; | |
2042 | struct page *tmp_page; | |
2043 | unsigned long expected_index; | |
2044 | ||
2045 | if (list_empty(page_list)) | |
2046 | break; | |
2047 | ||
2048 | page = list_entry(page_list->prev, struct page, lru); | |
2049 | offset = (loff_t)page->index << PAGE_CACHE_SHIFT; | |
2050 | ||
2051 | /* count adjacent pages that we will read into */ | |
2052 | contig_pages = 0; | |
fb8c4b14 | 2053 | expected_index = |
1da177e4 | 2054 | list_entry(page_list->prev, struct page, lru)->index; |
fb8c4b14 | 2055 | list_for_each_entry_reverse(tmp_page, page_list, lru) { |
1da177e4 LT |
2056 | if (tmp_page->index == expected_index) { |
2057 | contig_pages++; | |
2058 | expected_index++; | |
2059 | } else | |
fb8c4b14 | 2060 | break; |
1da177e4 LT |
2061 | } |
2062 | if (contig_pages + i > num_pages) | |
2063 | contig_pages = num_pages - i; | |
2064 | ||
2065 | /* for reads over a certain size could initiate async | |
2066 | read ahead */ | |
2067 | ||
2068 | read_size = contig_pages * PAGE_CACHE_SIZE; | |
2069 | /* Read size needs to be in multiples of one page */ | |
2070 | read_size = min_t(const unsigned int, read_size, | |
2071 | cifs_sb->rsize & PAGE_CACHE_MASK); | |
90c81e0b | 2072 | cFYI(DBG2, ("rpages: read size 0x%x contiguous pages %d", |
75865f8c | 2073 | read_size, contig_pages)); |
1da177e4 LT |
2074 | rc = -EAGAIN; |
2075 | while (rc == -EAGAIN) { | |
fb8c4b14 | 2076 | if ((open_file->invalidHandle) && |
1da177e4 | 2077 | (!open_file->closePend)) { |
4b18f2a9 | 2078 | rc = cifs_reopen_file(file, true); |
1da177e4 LT |
2079 | if (rc != 0) |
2080 | break; | |
2081 | } | |
2082 | ||
bfa0d75a | 2083 | rc = CIFSSMBRead(xid, pTcon, |
ec637e3f SF |
2084 | open_file->netfid, |
2085 | read_size, offset, | |
2086 | &bytes_read, &smb_read_data, | |
2087 | &buf_type); | |
a9d02ad4 | 2088 | /* BB more RC checks ? */ |
fb8c4b14 | 2089 | if (rc == -EAGAIN) { |
1da177e4 | 2090 | if (smb_read_data) { |
fb8c4b14 | 2091 | if (buf_type == CIFS_SMALL_BUFFER) |
ec637e3f | 2092 | cifs_small_buf_release(smb_read_data); |
fb8c4b14 | 2093 | else if (buf_type == CIFS_LARGE_BUFFER) |
ec637e3f | 2094 | cifs_buf_release(smb_read_data); |
1da177e4 LT |
2095 | smb_read_data = NULL; |
2096 | } | |
2097 | } | |
2098 | } | |
2099 | if ((rc < 0) || (smb_read_data == NULL)) { | |
2100 | cFYI(1, ("Read error in readpages: %d", rc)); | |
1da177e4 LT |
2101 | break; |
2102 | } else if (bytes_read > 0) { | |
6f88cc2e | 2103 | task_io_account_read(bytes_read); |
1da177e4 LT |
2104 | pSMBr = (struct smb_com_read_rsp *)smb_read_data; |
2105 | cifs_copy_cache_pages(mapping, page_list, bytes_read, | |
2106 | smb_read_data + 4 /* RFC1001 hdr */ + | |
2107 | le16_to_cpu(pSMBr->DataOffset), &lru_pvec); | |
2108 | ||
2109 | i += bytes_read >> PAGE_CACHE_SHIFT; | |
a4544347 | 2110 | cifs_stats_bytes_read(pTcon, bytes_read); |
2c2130e1 | 2111 | if ((bytes_read & PAGE_CACHE_MASK) != bytes_read) { |
1da177e4 LT |
2112 | i++; /* account for partial page */ |
2113 | ||
fb8c4b14 | 2114 | /* server copy of file can have smaller size |
1da177e4 | 2115 | than client */ |
fb8c4b14 SF |
2116 | /* BB do we need to verify this common case ? |
2117 | this case is ok - if we are at server EOF | |
1da177e4 LT |
2118 | we will hit it on next read */ |
2119 | ||
05ac9d4b | 2120 | /* break; */ |
1da177e4 LT |
2121 | } |
2122 | } else { | |
2123 | cFYI(1, ("No bytes read (%d) at offset %lld . " | |
2124 | "Cleaning remaining pages from readahead list", | |
2125 | bytes_read, offset)); | |
fb8c4b14 | 2126 | /* BB turn off caching and do new lookup on |
1da177e4 | 2127 | file size at server? */ |
1da177e4 LT |
2128 | break; |
2129 | } | |
2130 | if (smb_read_data) { | |
fb8c4b14 | 2131 | if (buf_type == CIFS_SMALL_BUFFER) |
ec637e3f | 2132 | cifs_small_buf_release(smb_read_data); |
fb8c4b14 | 2133 | else if (buf_type == CIFS_LARGE_BUFFER) |
ec637e3f | 2134 | cifs_buf_release(smb_read_data); |
1da177e4 LT |
2135 | smb_read_data = NULL; |
2136 | } | |
2137 | bytes_read = 0; | |
2138 | } | |
2139 | ||
4f98a2fe | 2140 | pagevec_lru_add_file(&lru_pvec); |
1da177e4 LT |
2141 | |
2142 | /* need to free smb_read_data buf before exit */ | |
2143 | if (smb_read_data) { | |
fb8c4b14 | 2144 | if (buf_type == CIFS_SMALL_BUFFER) |
47c886b3 | 2145 | cifs_small_buf_release(smb_read_data); |
fb8c4b14 | 2146 | else if (buf_type == CIFS_LARGE_BUFFER) |
47c886b3 | 2147 | cifs_buf_release(smb_read_data); |
1da177e4 | 2148 | smb_read_data = NULL; |
fb8c4b14 | 2149 | } |
1da177e4 LT |
2150 | |
2151 | FreeXid(xid); | |
2152 | return rc; | |
2153 | } | |
2154 | ||
2155 | static int cifs_readpage_worker(struct file *file, struct page *page, | |
2156 | loff_t *poffset) | |
2157 | { | |
2158 | char *read_data; | |
2159 | int rc; | |
2160 | ||
2161 | page_cache_get(page); | |
2162 | read_data = kmap(page); | |
2163 | /* for reads over a certain size could initiate async read ahead */ | |
fb8c4b14 | 2164 | |
1da177e4 | 2165 | rc = cifs_read(file, read_data, PAGE_CACHE_SIZE, poffset); |
fb8c4b14 | 2166 | |
1da177e4 LT |
2167 | if (rc < 0) |
2168 | goto io_error; | |
2169 | else | |
fb8c4b14 SF |
2170 | cFYI(1, ("Bytes read %d", rc)); |
2171 | ||
e6a00296 JJS |
2172 | file->f_path.dentry->d_inode->i_atime = |
2173 | current_fs_time(file->f_path.dentry->d_inode->i_sb); | |
fb8c4b14 | 2174 | |
1da177e4 LT |
2175 | if (PAGE_CACHE_SIZE > rc) |
2176 | memset(read_data + rc, 0, PAGE_CACHE_SIZE - rc); | |
2177 | ||
2178 | flush_dcache_page(page); | |
2179 | SetPageUptodate(page); | |
2180 | rc = 0; | |
fb8c4b14 | 2181 | |
1da177e4 | 2182 | io_error: |
fb8c4b14 | 2183 | kunmap(page); |
1da177e4 LT |
2184 | page_cache_release(page); |
2185 | return rc; | |
2186 | } | |
2187 | ||
2188 | static int cifs_readpage(struct file *file, struct page *page) | |
2189 | { | |
2190 | loff_t offset = (loff_t)page->index << PAGE_CACHE_SHIFT; | |
2191 | int rc = -EACCES; | |
2192 | int xid; | |
2193 | ||
2194 | xid = GetXid(); | |
2195 | ||
2196 | if (file->private_data == NULL) { | |
2197 | FreeXid(xid); | |
2198 | return -EBADF; | |
2199 | } | |
2200 | ||
fb8c4b14 | 2201 | cFYI(1, ("readpage %p at offset %d 0x%x\n", |
1da177e4 LT |
2202 | page, (int)offset, (int)offset)); |
2203 | ||
2204 | rc = cifs_readpage_worker(file, page, &offset); | |
2205 | ||
2206 | unlock_page(page); | |
2207 | ||
2208 | FreeXid(xid); | |
2209 | return rc; | |
2210 | } | |
2211 | ||
a403a0a3 SF |
2212 | static int is_inode_writable(struct cifsInodeInfo *cifs_inode) |
2213 | { | |
2214 | struct cifsFileInfo *open_file; | |
2215 | ||
2216 | read_lock(&GlobalSMBSeslock); | |
2217 | list_for_each_entry(open_file, &cifs_inode->openFileList, flist) { | |
2218 | if (open_file->closePend) | |
2219 | continue; | |
2220 | if (open_file->pfile && | |
2221 | ((open_file->pfile->f_flags & O_RDWR) || | |
2222 | (open_file->pfile->f_flags & O_WRONLY))) { | |
2223 | read_unlock(&GlobalSMBSeslock); | |
2224 | return 1; | |
2225 | } | |
2226 | } | |
2227 | read_unlock(&GlobalSMBSeslock); | |
2228 | return 0; | |
2229 | } | |
2230 | ||
1da177e4 LT |
2231 | /* We do not want to update the file size from server for inodes |
2232 | open for write - to avoid races with writepage extending | |
2233 | the file - in the future we could consider allowing | |
fb8c4b14 | 2234 | refreshing the inode only on increases in the file size |
1da177e4 LT |
2235 | but this is tricky to do without racing with writebehind |
2236 | page caching in the current Linux kernel design */ | |
4b18f2a9 | 2237 | bool is_size_safe_to_change(struct cifsInodeInfo *cifsInode, __u64 end_of_file) |
1da177e4 | 2238 | { |
a403a0a3 | 2239 | if (!cifsInode) |
4b18f2a9 | 2240 | return true; |
50c2f753 | 2241 | |
a403a0a3 SF |
2242 | if (is_inode_writable(cifsInode)) { |
2243 | /* This inode is open for write at least once */ | |
c32a0b68 SF |
2244 | struct cifs_sb_info *cifs_sb; |
2245 | ||
c32a0b68 | 2246 | cifs_sb = CIFS_SB(cifsInode->vfs_inode.i_sb); |
ad7a2926 | 2247 | if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DIRECT_IO) { |
fb8c4b14 | 2248 | /* since no page cache to corrupt on directio |
c32a0b68 | 2249 | we can change size safely */ |
4b18f2a9 | 2250 | return true; |
c32a0b68 SF |
2251 | } |
2252 | ||
fb8c4b14 | 2253 | if (i_size_read(&cifsInode->vfs_inode) < end_of_file) |
4b18f2a9 | 2254 | return true; |
7ba52631 | 2255 | |
4b18f2a9 | 2256 | return false; |
23e7dd7d | 2257 | } else |
4b18f2a9 | 2258 | return true; |
1da177e4 LT |
2259 | } |
2260 | ||
d9414774 NP |
2261 | static int cifs_write_begin(struct file *file, struct address_space *mapping, |
2262 | loff_t pos, unsigned len, unsigned flags, | |
2263 | struct page **pagep, void **fsdata) | |
1da177e4 | 2264 | { |
d9414774 NP |
2265 | pgoff_t index = pos >> PAGE_CACHE_SHIFT; |
2266 | loff_t offset = pos & (PAGE_CACHE_SIZE - 1); | |
a98ee8c1 JL |
2267 | loff_t page_start = pos & PAGE_MASK; |
2268 | loff_t i_size; | |
2269 | struct page *page; | |
2270 | int rc = 0; | |
d9414774 NP |
2271 | |
2272 | cFYI(1, ("write_begin from %lld len %d", (long long)pos, len)); | |
2273 | ||
54566b2c | 2274 | page = grab_cache_page_write_begin(mapping, index, flags); |
a98ee8c1 JL |
2275 | if (!page) { |
2276 | rc = -ENOMEM; | |
2277 | goto out; | |
2278 | } | |
8a236264 | 2279 | |
a98ee8c1 JL |
2280 | if (PageUptodate(page)) |
2281 | goto out; | |
8a236264 | 2282 | |
a98ee8c1 JL |
2283 | /* |
2284 | * If we write a full page it will be up to date, no need to read from | |
2285 | * the server. If the write is short, we'll end up doing a sync write | |
2286 | * instead. | |
2287 | */ | |
2288 | if (len == PAGE_CACHE_SIZE) | |
2289 | goto out; | |
8a236264 | 2290 | |
a98ee8c1 JL |
2291 | /* |
2292 | * optimize away the read when we have an oplock, and we're not | |
2293 | * expecting to use any of the data we'd be reading in. That | |
2294 | * is, when the page lies beyond the EOF, or straddles the EOF | |
2295 | * and the write will cover all of the existing data. | |
2296 | */ | |
2297 | if (CIFS_I(mapping->host)->clientCanCacheRead) { | |
2298 | i_size = i_size_read(mapping->host); | |
2299 | if (page_start >= i_size || | |
2300 | (offset == 0 && (pos + len) >= i_size)) { | |
2301 | zero_user_segments(page, 0, offset, | |
2302 | offset + len, | |
2303 | PAGE_CACHE_SIZE); | |
2304 | /* | |
2305 | * PageChecked means that the parts of the page | |
2306 | * to which we're not writing are considered up | |
2307 | * to date. Once the data is copied to the | |
2308 | * page, it can be set uptodate. | |
2309 | */ | |
2310 | SetPageChecked(page); | |
2311 | goto out; | |
2312 | } | |
2313 | } | |
d9414774 | 2314 | |
a98ee8c1 JL |
2315 | if ((file->f_flags & O_ACCMODE) != O_WRONLY) { |
2316 | /* | |
2317 | * might as well read a page, it is fast enough. If we get | |
2318 | * an error, we don't need to return it. cifs_write_end will | |
2319 | * do a sync write instead since PG_uptodate isn't set. | |
2320 | */ | |
2321 | cifs_readpage_worker(file, page, &page_start); | |
8a236264 SF |
2322 | } else { |
2323 | /* we could try using another file handle if there is one - | |
2324 | but how would we lock it to prevent close of that handle | |
2325 | racing with this read? In any case | |
d9414774 | 2326 | this will be written out by write_end so is fine */ |
1da177e4 | 2327 | } |
a98ee8c1 JL |
2328 | out: |
2329 | *pagep = page; | |
2330 | return rc; | |
1da177e4 LT |
2331 | } |
2332 | ||
f5e54d6e | 2333 | const struct address_space_operations cifs_addr_ops = { |
1da177e4 LT |
2334 | .readpage = cifs_readpage, |
2335 | .readpages = cifs_readpages, | |
2336 | .writepage = cifs_writepage, | |
37c0eb46 | 2337 | .writepages = cifs_writepages, |
d9414774 NP |
2338 | .write_begin = cifs_write_begin, |
2339 | .write_end = cifs_write_end, | |
1da177e4 LT |
2340 | .set_page_dirty = __set_page_dirty_nobuffers, |
2341 | /* .sync_page = cifs_sync_page, */ | |
2342 | /* .direct_IO = */ | |
2343 | }; | |
273d81d6 DK |
2344 | |
2345 | /* | |
2346 | * cifs_readpages requires the server to support a buffer large enough to | |
2347 | * contain the header plus one complete page of data. Otherwise, we need | |
2348 | * to leave cifs_readpages out of the address space operations. | |
2349 | */ | |
f5e54d6e | 2350 | const struct address_space_operations cifs_addr_ops_smallbuf = { |
273d81d6 DK |
2351 | .readpage = cifs_readpage, |
2352 | .writepage = cifs_writepage, | |
2353 | .writepages = cifs_writepages, | |
d9414774 NP |
2354 | .write_begin = cifs_write_begin, |
2355 | .write_end = cifs_write_end, | |
273d81d6 DK |
2356 | .set_page_dirty = __set_page_dirty_nobuffers, |
2357 | /* .sync_page = cifs_sync_page, */ | |
2358 | /* .direct_IO = */ | |
2359 | }; |