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; |
a6ce4932 | 49 | mutex_init(&private_data->fh_mutex); |
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; | |
6ab409b5 DK |
56 | /* Initialize reference count to one. The private data is |
57 | freed on the release of the last reference */ | |
58 | atomic_set(&private_data->count, 1); | |
1da177e4 LT |
59 | |
60 | return private_data; | |
61 | } | |
62 | ||
63 | static inline int cifs_convert_flags(unsigned int flags) | |
64 | { | |
65 | if ((flags & O_ACCMODE) == O_RDONLY) | |
66 | return GENERIC_READ; | |
67 | else if ((flags & O_ACCMODE) == O_WRONLY) | |
68 | return GENERIC_WRITE; | |
69 | else if ((flags & O_ACCMODE) == O_RDWR) { | |
70 | /* GENERIC_ALL is too much permission to request | |
71 | can cause unnecessary access denied on create */ | |
72 | /* return GENERIC_ALL; */ | |
73 | return (GENERIC_READ | GENERIC_WRITE); | |
74 | } | |
75 | ||
e10f7b55 JL |
76 | return (READ_CONTROL | FILE_WRITE_ATTRIBUTES | FILE_READ_ATTRIBUTES | |
77 | FILE_WRITE_EA | FILE_APPEND_DATA | FILE_WRITE_DATA | | |
78 | FILE_READ_DATA); | |
7fc8f4e9 | 79 | } |
e10f7b55 | 80 | |
7fc8f4e9 SF |
81 | static inline fmode_t cifs_posix_convert_flags(unsigned int flags) |
82 | { | |
83 | fmode_t posix_flags = 0; | |
e10f7b55 | 84 | |
7fc8f4e9 SF |
85 | if ((flags & O_ACCMODE) == O_RDONLY) |
86 | posix_flags = FMODE_READ; | |
87 | else if ((flags & O_ACCMODE) == O_WRONLY) | |
88 | posix_flags = FMODE_WRITE; | |
89 | else if ((flags & O_ACCMODE) == O_RDWR) { | |
90 | /* GENERIC_ALL is too much permission to request | |
91 | can cause unnecessary access denied on create */ | |
92 | /* return GENERIC_ALL; */ | |
93 | posix_flags = FMODE_READ | FMODE_WRITE; | |
94 | } | |
95 | /* can not map O_CREAT or O_EXCL or O_TRUNC flags when | |
96 | reopening a file. They had their effect on the original open */ | |
97 | if (flags & O_APPEND) | |
98 | posix_flags |= (fmode_t)O_APPEND; | |
99 | if (flags & O_SYNC) | |
100 | posix_flags |= (fmode_t)O_SYNC; | |
101 | if (flags & O_DIRECTORY) | |
102 | posix_flags |= (fmode_t)O_DIRECTORY; | |
103 | if (flags & O_NOFOLLOW) | |
104 | posix_flags |= (fmode_t)O_NOFOLLOW; | |
105 | if (flags & O_DIRECT) | |
106 | posix_flags |= (fmode_t)O_DIRECT; | |
107 | ||
108 | return posix_flags; | |
1da177e4 LT |
109 | } |
110 | ||
111 | static inline int cifs_get_disposition(unsigned int flags) | |
112 | { | |
113 | if ((flags & (O_CREAT | O_EXCL)) == (O_CREAT | O_EXCL)) | |
114 | return FILE_CREATE; | |
115 | else if ((flags & (O_CREAT | O_TRUNC)) == (O_CREAT | O_TRUNC)) | |
116 | return FILE_OVERWRITE_IF; | |
117 | else if ((flags & O_CREAT) == O_CREAT) | |
118 | return FILE_OPEN_IF; | |
55aa2e09 SF |
119 | else if ((flags & O_TRUNC) == O_TRUNC) |
120 | return FILE_OVERWRITE; | |
1da177e4 LT |
121 | else |
122 | return FILE_OPEN; | |
123 | } | |
124 | ||
276a74a4 SF |
125 | /* all arguments to this function must be checked for validity in caller */ |
126 | static inline int cifs_posix_open_inode_helper(struct inode *inode, | |
127 | struct file *file, struct cifsInodeInfo *pCifsInode, | |
128 | struct cifsFileInfo *pCifsFile, int oplock, u16 netfid) | |
129 | { | |
276a74a4 | 130 | |
276a74a4 | 131 | write_lock(&GlobalSMBSeslock); |
276a74a4 SF |
132 | |
133 | pCifsInode = CIFS_I(file->f_path.dentry->d_inode); | |
134 | if (pCifsInode == NULL) { | |
135 | write_unlock(&GlobalSMBSeslock); | |
136 | return -EINVAL; | |
137 | } | |
138 | ||
276a74a4 SF |
139 | if (pCifsInode->clientCanCacheRead) { |
140 | /* we have the inode open somewhere else | |
141 | no need to discard cache data */ | |
142 | goto psx_client_can_cache; | |
143 | } | |
144 | ||
145 | /* BB FIXME need to fix this check to move it earlier into posix_open | |
146 | BB fIX following section BB FIXME */ | |
147 | ||
148 | /* if not oplocked, invalidate inode pages if mtime or file | |
149 | size changed */ | |
150 | /* temp = cifs_NTtimeToUnix(le64_to_cpu(buf->LastWriteTime)); | |
151 | if (timespec_equal(&file->f_path.dentry->d_inode->i_mtime, &temp) && | |
152 | (file->f_path.dentry->d_inode->i_size == | |
153 | (loff_t)le64_to_cpu(buf->EndOfFile))) { | |
154 | cFYI(1, ("inode unchanged on server")); | |
155 | } else { | |
156 | if (file->f_path.dentry->d_inode->i_mapping) { | |
157 | rc = filemap_write_and_wait(file->f_path.dentry->d_inode->i_mapping); | |
158 | if (rc != 0) | |
159 | CIFS_I(file->f_path.dentry->d_inode)->write_behind_rc = rc; | |
160 | } | |
161 | cFYI(1, ("invalidating remote inode since open detected it " | |
162 | "changed")); | |
163 | invalidate_remote_inode(file->f_path.dentry->d_inode); | |
164 | } */ | |
165 | ||
166 | psx_client_can_cache: | |
167 | if ((oplock & 0xF) == OPLOCK_EXCLUSIVE) { | |
168 | pCifsInode->clientCanCacheAll = true; | |
169 | pCifsInode->clientCanCacheRead = true; | |
170 | cFYI(1, ("Exclusive Oplock granted on inode %p", | |
171 | file->f_path.dentry->d_inode)); | |
172 | } else if ((oplock & 0xF) == OPLOCK_READ) | |
173 | pCifsInode->clientCanCacheRead = true; | |
174 | ||
175 | /* will have to change the unlock if we reenable the | |
176 | filemap_fdatawrite (which does not seem necessary */ | |
177 | write_unlock(&GlobalSMBSeslock); | |
178 | return 0; | |
179 | } | |
180 | ||
703a3b8e SF |
181 | static struct cifsFileInfo * |
182 | cifs_fill_filedata(struct file *file) | |
183 | { | |
184 | struct list_head *tmp; | |
185 | struct cifsFileInfo *pCifsFile = NULL; | |
186 | struct cifsInodeInfo *pCifsInode = NULL; | |
187 | ||
188 | /* search inode for this file and fill in file->private_data */ | |
189 | pCifsInode = CIFS_I(file->f_path.dentry->d_inode); | |
190 | read_lock(&GlobalSMBSeslock); | |
191 | list_for_each(tmp, &pCifsInode->openFileList) { | |
192 | pCifsFile = list_entry(tmp, struct cifsFileInfo, flist); | |
193 | if ((pCifsFile->pfile == NULL) && | |
194 | (pCifsFile->pid == current->tgid)) { | |
195 | /* mode set in cifs_create */ | |
196 | ||
197 | /* needed for writepage */ | |
198 | pCifsFile->pfile = file; | |
199 | file->private_data = pCifsFile; | |
200 | break; | |
201 | } | |
202 | } | |
203 | read_unlock(&GlobalSMBSeslock); | |
204 | ||
205 | if (file->private_data != NULL) { | |
206 | return pCifsFile; | |
207 | } else if ((file->f_flags & O_CREAT) && (file->f_flags & O_EXCL)) | |
208 | cERROR(1, ("could not find file instance for " | |
209 | "new file %p", file)); | |
210 | return NULL; | |
211 | } | |
212 | ||
1da177e4 LT |
213 | /* all arguments to this function must be checked for validity in caller */ |
214 | static inline int cifs_open_inode_helper(struct inode *inode, struct file *file, | |
215 | struct cifsInodeInfo *pCifsInode, struct cifsFileInfo *pCifsFile, | |
216 | struct cifsTconInfo *pTcon, int *oplock, FILE_ALL_INFO *buf, | |
217 | char *full_path, int xid) | |
218 | { | |
219 | struct timespec temp; | |
220 | int rc; | |
221 | ||
222 | /* want handles we can use to read with first | |
223 | in the list so we do not have to walk the | |
d9414774 | 224 | list to search for one in write_begin */ |
1da177e4 | 225 | if ((file->f_flags & O_ACCMODE) == O_WRONLY) { |
fb8c4b14 | 226 | list_add_tail(&pCifsFile->flist, |
1da177e4 LT |
227 | &pCifsInode->openFileList); |
228 | } else { | |
229 | list_add(&pCifsFile->flist, | |
230 | &pCifsInode->openFileList); | |
231 | } | |
232 | write_unlock(&GlobalSMBSeslock); | |
1da177e4 LT |
233 | if (pCifsInode->clientCanCacheRead) { |
234 | /* we have the inode open somewhere else | |
235 | no need to discard cache data */ | |
236 | goto client_can_cache; | |
237 | } | |
238 | ||
239 | /* BB need same check in cifs_create too? */ | |
240 | /* if not oplocked, invalidate inode pages if mtime or file | |
241 | size changed */ | |
07119a4d | 242 | temp = cifs_NTtimeToUnix(buf->LastWriteTime); |
e6a00296 JJS |
243 | if (timespec_equal(&file->f_path.dentry->d_inode->i_mtime, &temp) && |
244 | (file->f_path.dentry->d_inode->i_size == | |
1da177e4 LT |
245 | (loff_t)le64_to_cpu(buf->EndOfFile))) { |
246 | cFYI(1, ("inode unchanged on server")); | |
247 | } else { | |
e6a00296 | 248 | if (file->f_path.dentry->d_inode->i_mapping) { |
1da177e4 LT |
249 | /* BB no need to lock inode until after invalidate |
250 | since namei code should already have it locked? */ | |
cea21805 JL |
251 | rc = filemap_write_and_wait(file->f_path.dentry->d_inode->i_mapping); |
252 | if (rc != 0) | |
253 | CIFS_I(file->f_path.dentry->d_inode)->write_behind_rc = rc; | |
1da177e4 LT |
254 | } |
255 | cFYI(1, ("invalidating remote inode since open detected it " | |
256 | "changed")); | |
e6a00296 | 257 | invalidate_remote_inode(file->f_path.dentry->d_inode); |
1da177e4 LT |
258 | } |
259 | ||
260 | client_can_cache: | |
c18c842b | 261 | if (pTcon->unix_ext) |
e6a00296 | 262 | rc = cifs_get_inode_info_unix(&file->f_path.dentry->d_inode, |
1da177e4 LT |
263 | full_path, inode->i_sb, xid); |
264 | else | |
e6a00296 | 265 | rc = cifs_get_inode_info(&file->f_path.dentry->d_inode, |
8b1327f6 | 266 | full_path, buf, inode->i_sb, xid, NULL); |
1da177e4 LT |
267 | |
268 | if ((*oplock & 0xF) == OPLOCK_EXCLUSIVE) { | |
4b18f2a9 SF |
269 | pCifsInode->clientCanCacheAll = true; |
270 | pCifsInode->clientCanCacheRead = true; | |
1da177e4 | 271 | cFYI(1, ("Exclusive Oplock granted on inode %p", |
e6a00296 | 272 | file->f_path.dentry->d_inode)); |
1da177e4 | 273 | } else if ((*oplock & 0xF) == OPLOCK_READ) |
4b18f2a9 | 274 | pCifsInode->clientCanCacheRead = true; |
1da177e4 LT |
275 | |
276 | return rc; | |
277 | } | |
278 | ||
279 | int cifs_open(struct inode *inode, struct file *file) | |
280 | { | |
281 | int rc = -EACCES; | |
282 | int xid, oplock; | |
283 | struct cifs_sb_info *cifs_sb; | |
276a74a4 | 284 | struct cifsTconInfo *tcon; |
1da177e4 LT |
285 | struct cifsFileInfo *pCifsFile; |
286 | struct cifsInodeInfo *pCifsInode; | |
1da177e4 LT |
287 | char *full_path = NULL; |
288 | int desiredAccess; | |
289 | int disposition; | |
290 | __u16 netfid; | |
291 | FILE_ALL_INFO *buf = NULL; | |
292 | ||
293 | xid = GetXid(); | |
294 | ||
295 | cifs_sb = CIFS_SB(inode->i_sb); | |
276a74a4 | 296 | tcon = cifs_sb->tcon; |
1da177e4 | 297 | |
a6ce4932 | 298 | pCifsInode = CIFS_I(file->f_path.dentry->d_inode); |
703a3b8e SF |
299 | pCifsFile = cifs_fill_filedata(file); |
300 | if (pCifsFile) { | |
0f3bc09e | 301 | rc = 0; |
a6ce4932 | 302 | FreeXid(xid); |
0f3bc09e | 303 | return rc; |
703a3b8e | 304 | } |
1da177e4 | 305 | |
e6a00296 | 306 | full_path = build_path_from_dentry(file->f_path.dentry); |
1da177e4 | 307 | if (full_path == NULL) { |
0f3bc09e | 308 | rc = -ENOMEM; |
1da177e4 | 309 | FreeXid(xid); |
0f3bc09e | 310 | return rc; |
1da177e4 LT |
311 | } |
312 | ||
7521a3c5 | 313 | cFYI(1, ("inode = 0x%p file flags are 0x%x for %s", |
1da177e4 | 314 | inode, file->f_flags, full_path)); |
276a74a4 SF |
315 | |
316 | if (oplockEnabled) | |
317 | oplock = REQ_OPLOCK; | |
318 | else | |
319 | oplock = 0; | |
320 | ||
64cc2c63 SF |
321 | if (!tcon->broken_posix_open && tcon->unix_ext && |
322 | (tcon->ses->capabilities & CAP_UNIX) && | |
276a74a4 SF |
323 | (CIFS_UNIX_POSIX_PATH_OPS_CAP & |
324 | le64_to_cpu(tcon->fsUnixInfo.Capability))) { | |
325 | int oflags = (int) cifs_posix_convert_flags(file->f_flags); | |
326 | /* can not refresh inode info since size could be stale */ | |
327 | rc = cifs_posix_open(full_path, &inode, inode->i_sb, | |
328 | cifs_sb->mnt_file_mode /* ignored */, | |
329 | oflags, &oplock, &netfid, xid); | |
330 | if (rc == 0) { | |
331 | cFYI(1, ("posix open succeeded")); | |
332 | /* no need for special case handling of setting mode | |
333 | on read only files needed here */ | |
334 | ||
703a3b8e | 335 | pCifsFile = cifs_fill_filedata(file); |
276a74a4 SF |
336 | cifs_posix_open_inode_helper(inode, file, pCifsInode, |
337 | pCifsFile, oplock, netfid); | |
338 | goto out; | |
64cc2c63 SF |
339 | } else if ((rc == -EINVAL) || (rc == -EOPNOTSUPP)) { |
340 | if (tcon->ses->serverNOS) | |
341 | cERROR(1, ("server %s of type %s returned" | |
342 | " unexpected error on SMB posix open" | |
343 | ", disabling posix open support." | |
344 | " Check if server update available.", | |
345 | tcon->ses->serverName, | |
346 | tcon->ses->serverNOS)); | |
347 | tcon->broken_posix_open = true; | |
276a74a4 SF |
348 | } else if ((rc != -EIO) && (rc != -EREMOTE) && |
349 | (rc != -EOPNOTSUPP)) /* path not found or net err */ | |
350 | goto out; | |
64cc2c63 SF |
351 | /* else fallthrough to retry open the old way on network i/o |
352 | or DFS errors */ | |
276a74a4 SF |
353 | } |
354 | ||
1da177e4 LT |
355 | desiredAccess = cifs_convert_flags(file->f_flags); |
356 | ||
357 | /********************************************************************* | |
358 | * open flag mapping table: | |
fb8c4b14 | 359 | * |
1da177e4 | 360 | * POSIX Flag CIFS Disposition |
fb8c4b14 | 361 | * ---------- ---------------- |
1da177e4 LT |
362 | * O_CREAT FILE_OPEN_IF |
363 | * O_CREAT | O_EXCL FILE_CREATE | |
364 | * O_CREAT | O_TRUNC FILE_OVERWRITE_IF | |
365 | * O_TRUNC FILE_OVERWRITE | |
366 | * none of the above FILE_OPEN | |
367 | * | |
368 | * Note that there is not a direct match between disposition | |
fb8c4b14 | 369 | * FILE_SUPERSEDE (ie create whether or not file exists although |
1da177e4 LT |
370 | * O_CREAT | O_TRUNC is similar but truncates the existing |
371 | * file rather than creating a new file as FILE_SUPERSEDE does | |
372 | * (which uses the attributes / metadata passed in on open call) | |
373 | *? | |
fb8c4b14 | 374 | *? O_SYNC is a reasonable match to CIFS writethrough flag |
1da177e4 LT |
375 | *? and the read write flags match reasonably. O_LARGEFILE |
376 | *? is irrelevant because largefile support is always used | |
377 | *? by this client. Flags O_APPEND, O_DIRECT, O_DIRECTORY, | |
378 | * O_FASYNC, O_NOFOLLOW, O_NONBLOCK need further investigation | |
379 | *********************************************************************/ | |
380 | ||
381 | disposition = cifs_get_disposition(file->f_flags); | |
382 | ||
1da177e4 LT |
383 | /* BB pass O_SYNC flag through on file attributes .. BB */ |
384 | ||
385 | /* Also refresh inode by passing in file_info buf returned by SMBOpen | |
386 | and calling get_inode_info with returned buf (at least helps | |
387 | non-Unix server case) */ | |
388 | ||
fb8c4b14 SF |
389 | /* BB we can not do this if this is the second open of a file |
390 | and the first handle has writebehind data, we might be | |
1da177e4 LT |
391 | able to simply do a filemap_fdatawrite/filemap_fdatawait first */ |
392 | buf = kmalloc(sizeof(FILE_ALL_INFO), GFP_KERNEL); | |
393 | if (!buf) { | |
394 | rc = -ENOMEM; | |
395 | goto out; | |
396 | } | |
5bafd765 SF |
397 | |
398 | if (cifs_sb->tcon->ses->capabilities & CAP_NT_SMBS) | |
276a74a4 | 399 | rc = CIFSSMBOpen(xid, tcon, full_path, disposition, |
5bafd765 | 400 | desiredAccess, CREATE_NOT_DIR, &netfid, &oplock, buf, |
737b758c SF |
401 | cifs_sb->local_nls, cifs_sb->mnt_cifs_flags |
402 | & CIFS_MOUNT_MAP_SPECIAL_CHR); | |
5bafd765 SF |
403 | else |
404 | rc = -EIO; /* no NT SMB support fall into legacy open below */ | |
405 | ||
a9d02ad4 SF |
406 | if (rc == -EIO) { |
407 | /* Old server, try legacy style OpenX */ | |
276a74a4 | 408 | rc = SMBLegacyOpen(xid, tcon, full_path, disposition, |
a9d02ad4 SF |
409 | desiredAccess, CREATE_NOT_DIR, &netfid, &oplock, buf, |
410 | cifs_sb->local_nls, cifs_sb->mnt_cifs_flags | |
411 | & CIFS_MOUNT_MAP_SPECIAL_CHR); | |
412 | } | |
1da177e4 | 413 | if (rc) { |
26a21b98 | 414 | cFYI(1, ("cifs_open returned 0x%x", rc)); |
1da177e4 LT |
415 | goto out; |
416 | } | |
417 | file->private_data = | |
418 | kmalloc(sizeof(struct cifsFileInfo), GFP_KERNEL); | |
419 | if (file->private_data == NULL) { | |
420 | rc = -ENOMEM; | |
421 | goto out; | |
422 | } | |
423 | pCifsFile = cifs_init_private(file->private_data, inode, file, netfid); | |
1da177e4 | 424 | write_lock(&GlobalSMBSeslock); |
276a74a4 | 425 | list_add(&pCifsFile->tlist, &tcon->openFileList); |
1da177e4 | 426 | |
e6a00296 | 427 | pCifsInode = CIFS_I(file->f_path.dentry->d_inode); |
1da177e4 LT |
428 | if (pCifsInode) { |
429 | rc = cifs_open_inode_helper(inode, file, pCifsInode, | |
276a74a4 | 430 | pCifsFile, tcon, |
1da177e4 LT |
431 | &oplock, buf, full_path, xid); |
432 | } else { | |
433 | write_unlock(&GlobalSMBSeslock); | |
1da177e4 LT |
434 | } |
435 | ||
fb8c4b14 | 436 | if (oplock & CIFS_CREATE_ACTION) { |
1da177e4 LT |
437 | /* time to set mode which we can not set earlier due to |
438 | problems creating new read-only files */ | |
276a74a4 | 439 | if (tcon->unix_ext) { |
4e1e7fb9 JL |
440 | struct cifs_unix_set_info_args args = { |
441 | .mode = inode->i_mode, | |
442 | .uid = NO_CHANGE_64, | |
443 | .gid = NO_CHANGE_64, | |
444 | .ctime = NO_CHANGE_64, | |
445 | .atime = NO_CHANGE_64, | |
446 | .mtime = NO_CHANGE_64, | |
447 | .device = 0, | |
448 | }; | |
01ea95e3 JL |
449 | CIFSSMBUnixSetPathInfo(xid, tcon, full_path, &args, |
450 | cifs_sb->local_nls, | |
451 | cifs_sb->mnt_cifs_flags & | |
737b758c | 452 | CIFS_MOUNT_MAP_SPECIAL_CHR); |
1da177e4 LT |
453 | } |
454 | } | |
455 | ||
456 | out: | |
457 | kfree(buf); | |
458 | kfree(full_path); | |
459 | FreeXid(xid); | |
460 | return rc; | |
461 | } | |
462 | ||
0418726b | 463 | /* Try to reacquire byte range locks that were released when session */ |
1da177e4 LT |
464 | /* to server was lost */ |
465 | static int cifs_relock_file(struct cifsFileInfo *cifsFile) | |
466 | { | |
467 | int rc = 0; | |
468 | ||
469 | /* BB list all locks open on this file and relock */ | |
470 | ||
471 | return rc; | |
472 | } | |
473 | ||
4b18f2a9 | 474 | static int cifs_reopen_file(struct file *file, bool can_flush) |
1da177e4 LT |
475 | { |
476 | int rc = -EACCES; | |
477 | int xid, oplock; | |
478 | struct cifs_sb_info *cifs_sb; | |
7fc8f4e9 | 479 | struct cifsTconInfo *tcon; |
1da177e4 LT |
480 | struct cifsFileInfo *pCifsFile; |
481 | struct cifsInodeInfo *pCifsInode; | |
fb8c4b14 | 482 | struct inode *inode; |
1da177e4 LT |
483 | char *full_path = NULL; |
484 | int desiredAccess; | |
485 | int disposition = FILE_OPEN; | |
486 | __u16 netfid; | |
487 | ||
ad7a2926 | 488 | if (file->private_data) |
1da177e4 | 489 | pCifsFile = (struct cifsFileInfo *)file->private_data; |
ad7a2926 | 490 | else |
1da177e4 LT |
491 | return -EBADF; |
492 | ||
493 | xid = GetXid(); | |
f0a71eb8 | 494 | mutex_lock(&pCifsFile->fh_mutex); |
4b18f2a9 | 495 | if (!pCifsFile->invalidHandle) { |
f0a71eb8 | 496 | mutex_unlock(&pCifsFile->fh_mutex); |
0f3bc09e | 497 | rc = 0; |
1da177e4 | 498 | FreeXid(xid); |
0f3bc09e | 499 | return rc; |
1da177e4 LT |
500 | } |
501 | ||
e6a00296 | 502 | if (file->f_path.dentry == NULL) { |
3a9f462f SF |
503 | cERROR(1, ("no valid name if dentry freed")); |
504 | dump_stack(); | |
505 | rc = -EBADF; | |
506 | goto reopen_error_exit; | |
507 | } | |
508 | ||
509 | inode = file->f_path.dentry->d_inode; | |
fb8c4b14 | 510 | if (inode == NULL) { |
3a9f462f SF |
511 | cERROR(1, ("inode not valid")); |
512 | dump_stack(); | |
513 | rc = -EBADF; | |
514 | goto reopen_error_exit; | |
1da177e4 | 515 | } |
50c2f753 | 516 | |
1da177e4 | 517 | cifs_sb = CIFS_SB(inode->i_sb); |
7fc8f4e9 | 518 | tcon = cifs_sb->tcon; |
3a9f462f | 519 | |
1da177e4 LT |
520 | /* can not grab rename sem here because various ops, including |
521 | those that already have the rename sem can end up causing writepage | |
522 | to get called and if the server was down that means we end up here, | |
523 | and we can never tell if the caller already has the rename_sem */ | |
e6a00296 | 524 | full_path = build_path_from_dentry(file->f_path.dentry); |
1da177e4 | 525 | if (full_path == NULL) { |
3a9f462f SF |
526 | rc = -ENOMEM; |
527 | reopen_error_exit: | |
f0a71eb8 | 528 | mutex_unlock(&pCifsFile->fh_mutex); |
1da177e4 | 529 | FreeXid(xid); |
3a9f462f | 530 | return rc; |
1da177e4 LT |
531 | } |
532 | ||
3a9f462f | 533 | cFYI(1, ("inode = 0x%p file flags 0x%x for %s", |
fb8c4b14 | 534 | inode, file->f_flags, full_path)); |
1da177e4 LT |
535 | |
536 | if (oplockEnabled) | |
537 | oplock = REQ_OPLOCK; | |
538 | else | |
4b18f2a9 | 539 | oplock = 0; |
1da177e4 | 540 | |
7fc8f4e9 SF |
541 | if (tcon->unix_ext && (tcon->ses->capabilities & CAP_UNIX) && |
542 | (CIFS_UNIX_POSIX_PATH_OPS_CAP & | |
543 | le64_to_cpu(tcon->fsUnixInfo.Capability))) { | |
544 | int oflags = (int) cifs_posix_convert_flags(file->f_flags); | |
545 | /* can not refresh inode info since size could be stale */ | |
546 | rc = cifs_posix_open(full_path, NULL, inode->i_sb, | |
547 | cifs_sb->mnt_file_mode /* ignored */, | |
548 | oflags, &oplock, &netfid, xid); | |
549 | if (rc == 0) { | |
550 | cFYI(1, ("posix reopen succeeded")); | |
551 | goto reopen_success; | |
552 | } | |
553 | /* fallthrough to retry open the old way on errors, especially | |
554 | in the reconnect path it is important to retry hard */ | |
555 | } | |
556 | ||
557 | desiredAccess = cifs_convert_flags(file->f_flags); | |
558 | ||
1da177e4 | 559 | /* Can not refresh inode by passing in file_info buf to be returned |
fb8c4b14 SF |
560 | by SMBOpen and then calling get_inode_info with returned buf |
561 | since file might have write behind data that needs to be flushed | |
1da177e4 LT |
562 | and server version of file size can be stale. If we knew for sure |
563 | that inode was not dirty locally we could do this */ | |
564 | ||
7fc8f4e9 | 565 | rc = CIFSSMBOpen(xid, tcon, full_path, disposition, desiredAccess, |
1da177e4 | 566 | CREATE_NOT_DIR, &netfid, &oplock, NULL, |
fb8c4b14 | 567 | cifs_sb->local_nls, cifs_sb->mnt_cifs_flags & |
737b758c | 568 | CIFS_MOUNT_MAP_SPECIAL_CHR); |
1da177e4 | 569 | if (rc) { |
f0a71eb8 | 570 | mutex_unlock(&pCifsFile->fh_mutex); |
26a21b98 SF |
571 | cFYI(1, ("cifs_open returned 0x%x", rc)); |
572 | cFYI(1, ("oplock: %d", oplock)); | |
1da177e4 | 573 | } else { |
7fc8f4e9 | 574 | reopen_success: |
1da177e4 | 575 | pCifsFile->netfid = netfid; |
4b18f2a9 | 576 | pCifsFile->invalidHandle = false; |
f0a71eb8 | 577 | mutex_unlock(&pCifsFile->fh_mutex); |
1da177e4 LT |
578 | pCifsInode = CIFS_I(inode); |
579 | if (pCifsInode) { | |
580 | if (can_flush) { | |
cea21805 JL |
581 | rc = filemap_write_and_wait(inode->i_mapping); |
582 | if (rc != 0) | |
583 | CIFS_I(inode)->write_behind_rc = rc; | |
1da177e4 LT |
584 | /* temporarily disable caching while we |
585 | go to server to get inode info */ | |
4b18f2a9 SF |
586 | pCifsInode->clientCanCacheAll = false; |
587 | pCifsInode->clientCanCacheRead = false; | |
7fc8f4e9 | 588 | if (tcon->unix_ext) |
1da177e4 LT |
589 | rc = cifs_get_inode_info_unix(&inode, |
590 | full_path, inode->i_sb, xid); | |
591 | else | |
592 | rc = cifs_get_inode_info(&inode, | |
593 | full_path, NULL, inode->i_sb, | |
8b1327f6 | 594 | xid, NULL); |
1da177e4 LT |
595 | } /* else we are writing out data to server already |
596 | and could deadlock if we tried to flush data, and | |
597 | since we do not know if we have data that would | |
598 | invalidate the current end of file on the server | |
599 | we can not go to the server to get the new inod | |
600 | info */ | |
601 | if ((oplock & 0xF) == OPLOCK_EXCLUSIVE) { | |
4b18f2a9 SF |
602 | pCifsInode->clientCanCacheAll = true; |
603 | pCifsInode->clientCanCacheRead = true; | |
1da177e4 | 604 | cFYI(1, ("Exclusive Oplock granted on inode %p", |
e6a00296 | 605 | file->f_path.dentry->d_inode)); |
1da177e4 | 606 | } else if ((oplock & 0xF) == OPLOCK_READ) { |
4b18f2a9 SF |
607 | pCifsInode->clientCanCacheRead = true; |
608 | pCifsInode->clientCanCacheAll = false; | |
1da177e4 | 609 | } else { |
4b18f2a9 SF |
610 | pCifsInode->clientCanCacheRead = false; |
611 | pCifsInode->clientCanCacheAll = false; | |
1da177e4 LT |
612 | } |
613 | cifs_relock_file(pCifsFile); | |
614 | } | |
615 | } | |
1da177e4 LT |
616 | kfree(full_path); |
617 | FreeXid(xid); | |
618 | return rc; | |
619 | } | |
620 | ||
621 | int cifs_close(struct inode *inode, struct file *file) | |
622 | { | |
623 | int rc = 0; | |
15745320 | 624 | int xid, timeout; |
1da177e4 LT |
625 | struct cifs_sb_info *cifs_sb; |
626 | struct cifsTconInfo *pTcon; | |
627 | struct cifsFileInfo *pSMBFile = | |
628 | (struct cifsFileInfo *)file->private_data; | |
629 | ||
630 | xid = GetXid(); | |
631 | ||
632 | cifs_sb = CIFS_SB(inode->i_sb); | |
633 | pTcon = cifs_sb->tcon; | |
634 | if (pSMBFile) { | |
7ee1af76 | 635 | struct cifsLockInfo *li, *tmp; |
ddb4cbfc | 636 | write_lock(&GlobalSMBSeslock); |
4b18f2a9 | 637 | pSMBFile->closePend = true; |
1da177e4 LT |
638 | if (pTcon) { |
639 | /* no sense reconnecting to close a file that is | |
640 | already closed */ | |
3b795210 | 641 | if (!pTcon->need_reconnect) { |
ddb4cbfc | 642 | write_unlock(&GlobalSMBSeslock); |
15745320 | 643 | timeout = 2; |
6ab409b5 | 644 | while ((atomic_read(&pSMBFile->count) != 1) |
15745320 | 645 | && (timeout <= 2048)) { |
23e7dd7d SF |
646 | /* Give write a better chance to get to |
647 | server ahead of the close. We do not | |
648 | want to add a wait_q here as it would | |
649 | increase the memory utilization as | |
650 | the struct would be in each open file, | |
fb8c4b14 | 651 | but this should give enough time to |
23e7dd7d | 652 | clear the socket */ |
90c81e0b SF |
653 | cFYI(DBG2, |
654 | ("close delay, write pending")); | |
23e7dd7d SF |
655 | msleep(timeout); |
656 | timeout *= 4; | |
4891d539 | 657 | } |
ddb4cbfc SF |
658 | if (!pTcon->need_reconnect && |
659 | !pSMBFile->invalidHandle) | |
660 | rc = CIFSSMBClose(xid, pTcon, | |
1da177e4 | 661 | pSMBFile->netfid); |
ddb4cbfc SF |
662 | } else |
663 | write_unlock(&GlobalSMBSeslock); | |
664 | } else | |
665 | write_unlock(&GlobalSMBSeslock); | |
7ee1af76 JA |
666 | |
667 | /* Delete any outstanding lock records. | |
668 | We'll lose them when the file is closed anyway. */ | |
796e5661 | 669 | mutex_lock(&pSMBFile->lock_mutex); |
7ee1af76 JA |
670 | list_for_each_entry_safe(li, tmp, &pSMBFile->llist, llist) { |
671 | list_del(&li->llist); | |
672 | kfree(li); | |
673 | } | |
796e5661 | 674 | mutex_unlock(&pSMBFile->lock_mutex); |
7ee1af76 | 675 | |
cbe0476f | 676 | write_lock(&GlobalSMBSeslock); |
1da177e4 LT |
677 | list_del(&pSMBFile->flist); |
678 | list_del(&pSMBFile->tlist); | |
cbe0476f | 679 | write_unlock(&GlobalSMBSeslock); |
6ab409b5 | 680 | cifsFileInfo_put(file->private_data); |
1da177e4 LT |
681 | file->private_data = NULL; |
682 | } else | |
683 | rc = -EBADF; | |
684 | ||
4efa53f0 | 685 | read_lock(&GlobalSMBSeslock); |
1da177e4 LT |
686 | if (list_empty(&(CIFS_I(inode)->openFileList))) { |
687 | cFYI(1, ("closing last open instance for inode %p", inode)); | |
688 | /* if the file is not open we do not know if we can cache info | |
689 | on this inode, much less write behind and read ahead */ | |
4b18f2a9 SF |
690 | CIFS_I(inode)->clientCanCacheRead = false; |
691 | CIFS_I(inode)->clientCanCacheAll = false; | |
1da177e4 | 692 | } |
4efa53f0 | 693 | read_unlock(&GlobalSMBSeslock); |
fb8c4b14 | 694 | if ((rc == 0) && CIFS_I(inode)->write_behind_rc) |
1da177e4 LT |
695 | rc = CIFS_I(inode)->write_behind_rc; |
696 | FreeXid(xid); | |
697 | return rc; | |
698 | } | |
699 | ||
700 | int cifs_closedir(struct inode *inode, struct file *file) | |
701 | { | |
702 | int rc = 0; | |
703 | int xid; | |
704 | struct cifsFileInfo *pCFileStruct = | |
705 | (struct cifsFileInfo *)file->private_data; | |
706 | char *ptmp; | |
707 | ||
26a21b98 | 708 | cFYI(1, ("Closedir inode = 0x%p", inode)); |
1da177e4 LT |
709 | |
710 | xid = GetXid(); | |
711 | ||
712 | if (pCFileStruct) { | |
713 | struct cifsTconInfo *pTcon; | |
fb8c4b14 SF |
714 | struct cifs_sb_info *cifs_sb = |
715 | CIFS_SB(file->f_path.dentry->d_sb); | |
1da177e4 LT |
716 | |
717 | pTcon = cifs_sb->tcon; | |
718 | ||
719 | cFYI(1, ("Freeing private data in close dir")); | |
ddb4cbfc | 720 | write_lock(&GlobalSMBSeslock); |
4b18f2a9 SF |
721 | if (!pCFileStruct->srch_inf.endOfSearch && |
722 | !pCFileStruct->invalidHandle) { | |
723 | pCFileStruct->invalidHandle = true; | |
ddb4cbfc | 724 | write_unlock(&GlobalSMBSeslock); |
1da177e4 LT |
725 | rc = CIFSFindClose(xid, pTcon, pCFileStruct->netfid); |
726 | cFYI(1, ("Closing uncompleted readdir with rc %d", | |
727 | rc)); | |
728 | /* not much we can do if it fails anyway, ignore rc */ | |
729 | rc = 0; | |
ddb4cbfc SF |
730 | } else |
731 | write_unlock(&GlobalSMBSeslock); | |
1da177e4 LT |
732 | ptmp = pCFileStruct->srch_inf.ntwrk_buf_start; |
733 | if (ptmp) { | |
ec637e3f | 734 | cFYI(1, ("closedir free smb buf in srch struct")); |
1da177e4 | 735 | pCFileStruct->srch_inf.ntwrk_buf_start = NULL; |
fb8c4b14 | 736 | if (pCFileStruct->srch_inf.smallBuf) |
d47d7c1a SF |
737 | cifs_small_buf_release(ptmp); |
738 | else | |
739 | cifs_buf_release(ptmp); | |
1da177e4 | 740 | } |
1da177e4 LT |
741 | kfree(file->private_data); |
742 | file->private_data = NULL; | |
743 | } | |
744 | /* BB can we lock the filestruct while this is going on? */ | |
745 | FreeXid(xid); | |
746 | return rc; | |
747 | } | |
748 | ||
7ee1af76 JA |
749 | static int store_file_lock(struct cifsFileInfo *fid, __u64 len, |
750 | __u64 offset, __u8 lockType) | |
751 | { | |
fb8c4b14 SF |
752 | struct cifsLockInfo *li = |
753 | kmalloc(sizeof(struct cifsLockInfo), GFP_KERNEL); | |
7ee1af76 JA |
754 | if (li == NULL) |
755 | return -ENOMEM; | |
756 | li->offset = offset; | |
757 | li->length = len; | |
758 | li->type = lockType; | |
796e5661 | 759 | mutex_lock(&fid->lock_mutex); |
7ee1af76 | 760 | list_add(&li->llist, &fid->llist); |
796e5661 | 761 | mutex_unlock(&fid->lock_mutex); |
7ee1af76 JA |
762 | return 0; |
763 | } | |
764 | ||
1da177e4 LT |
765 | int cifs_lock(struct file *file, int cmd, struct file_lock *pfLock) |
766 | { | |
767 | int rc, xid; | |
1da177e4 LT |
768 | __u32 numLock = 0; |
769 | __u32 numUnlock = 0; | |
770 | __u64 length; | |
4b18f2a9 | 771 | bool wait_flag = false; |
1da177e4 | 772 | struct cifs_sb_info *cifs_sb; |
13a6e42a | 773 | struct cifsTconInfo *tcon; |
08547b03 SF |
774 | __u16 netfid; |
775 | __u8 lockType = LOCKING_ANDX_LARGE_FILES; | |
13a6e42a | 776 | bool posix_locking = 0; |
1da177e4 LT |
777 | |
778 | length = 1 + pfLock->fl_end - pfLock->fl_start; | |
779 | rc = -EACCES; | |
780 | xid = GetXid(); | |
781 | ||
782 | cFYI(1, ("Lock parm: 0x%x flockflags: " | |
783 | "0x%x flocktype: 0x%x start: %lld end: %lld", | |
fb8c4b14 SF |
784 | cmd, pfLock->fl_flags, pfLock->fl_type, pfLock->fl_start, |
785 | pfLock->fl_end)); | |
1da177e4 LT |
786 | |
787 | if (pfLock->fl_flags & FL_POSIX) | |
d47d7c1a | 788 | cFYI(1, ("Posix")); |
1da177e4 | 789 | if (pfLock->fl_flags & FL_FLOCK) |
d47d7c1a | 790 | cFYI(1, ("Flock")); |
1da177e4 | 791 | if (pfLock->fl_flags & FL_SLEEP) { |
d47d7c1a | 792 | cFYI(1, ("Blocking lock")); |
4b18f2a9 | 793 | wait_flag = true; |
1da177e4 LT |
794 | } |
795 | if (pfLock->fl_flags & FL_ACCESS) | |
796 | cFYI(1, ("Process suspended by mandatory locking - " | |
26a21b98 | 797 | "not implemented yet")); |
1da177e4 LT |
798 | if (pfLock->fl_flags & FL_LEASE) |
799 | cFYI(1, ("Lease on file - not implemented yet")); | |
fb8c4b14 | 800 | if (pfLock->fl_flags & |
1da177e4 LT |
801 | (~(FL_POSIX | FL_FLOCK | FL_SLEEP | FL_ACCESS | FL_LEASE))) |
802 | cFYI(1, ("Unknown lock flags 0x%x", pfLock->fl_flags)); | |
803 | ||
804 | if (pfLock->fl_type == F_WRLCK) { | |
805 | cFYI(1, ("F_WRLCK ")); | |
806 | numLock = 1; | |
807 | } else if (pfLock->fl_type == F_UNLCK) { | |
d47d7c1a | 808 | cFYI(1, ("F_UNLCK")); |
1da177e4 | 809 | numUnlock = 1; |
d47d7c1a SF |
810 | /* Check if unlock includes more than |
811 | one lock range */ | |
1da177e4 | 812 | } else if (pfLock->fl_type == F_RDLCK) { |
d47d7c1a | 813 | cFYI(1, ("F_RDLCK")); |
1da177e4 LT |
814 | lockType |= LOCKING_ANDX_SHARED_LOCK; |
815 | numLock = 1; | |
816 | } else if (pfLock->fl_type == F_EXLCK) { | |
d47d7c1a | 817 | cFYI(1, ("F_EXLCK")); |
1da177e4 LT |
818 | numLock = 1; |
819 | } else if (pfLock->fl_type == F_SHLCK) { | |
d47d7c1a | 820 | cFYI(1, ("F_SHLCK")); |
1da177e4 LT |
821 | lockType |= LOCKING_ANDX_SHARED_LOCK; |
822 | numLock = 1; | |
823 | } else | |
d47d7c1a | 824 | cFYI(1, ("Unknown type of lock")); |
1da177e4 | 825 | |
e6a00296 | 826 | cifs_sb = CIFS_SB(file->f_path.dentry->d_sb); |
13a6e42a | 827 | tcon = cifs_sb->tcon; |
1da177e4 LT |
828 | |
829 | if (file->private_data == NULL) { | |
0f3bc09e | 830 | rc = -EBADF; |
1da177e4 | 831 | FreeXid(xid); |
0f3bc09e | 832 | return rc; |
1da177e4 | 833 | } |
08547b03 SF |
834 | netfid = ((struct cifsFileInfo *)file->private_data)->netfid; |
835 | ||
13a6e42a SF |
836 | if ((tcon->ses->capabilities & CAP_UNIX) && |
837 | (CIFS_UNIX_FCNTL_CAP & le64_to_cpu(tcon->fsUnixInfo.Capability)) && | |
acc18aa1 | 838 | ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NOPOSIXBRL) == 0)) |
13a6e42a | 839 | posix_locking = 1; |
08547b03 SF |
840 | /* BB add code here to normalize offset and length to |
841 | account for negative length which we can not accept over the | |
842 | wire */ | |
1da177e4 | 843 | if (IS_GETLK(cmd)) { |
fb8c4b14 | 844 | if (posix_locking) { |
08547b03 | 845 | int posix_lock_type; |
fb8c4b14 | 846 | if (lockType & LOCKING_ANDX_SHARED_LOCK) |
08547b03 SF |
847 | posix_lock_type = CIFS_RDLCK; |
848 | else | |
849 | posix_lock_type = CIFS_WRLCK; | |
13a6e42a | 850 | rc = CIFSSMBPosixLock(xid, tcon, netfid, 1 /* get */, |
fc94cdb9 | 851 | length, pfLock, |
08547b03 SF |
852 | posix_lock_type, wait_flag); |
853 | FreeXid(xid); | |
854 | return rc; | |
855 | } | |
856 | ||
857 | /* BB we could chain these into one lock request BB */ | |
13a6e42a | 858 | rc = CIFSSMBLock(xid, tcon, netfid, length, pfLock->fl_start, |
08547b03 | 859 | 0, 1, lockType, 0 /* wait flag */ ); |
1da177e4 | 860 | if (rc == 0) { |
13a6e42a | 861 | rc = CIFSSMBLock(xid, tcon, netfid, length, |
1da177e4 LT |
862 | pfLock->fl_start, 1 /* numUnlock */ , |
863 | 0 /* numLock */ , lockType, | |
864 | 0 /* wait flag */ ); | |
865 | pfLock->fl_type = F_UNLCK; | |
866 | if (rc != 0) | |
867 | cERROR(1, ("Error unlocking previously locked " | |
08547b03 | 868 | "range %d during test of lock", rc)); |
1da177e4 LT |
869 | rc = 0; |
870 | ||
871 | } else { | |
872 | /* if rc == ERR_SHARING_VIOLATION ? */ | |
873 | rc = 0; /* do not change lock type to unlock | |
874 | since range in use */ | |
875 | } | |
876 | ||
877 | FreeXid(xid); | |
878 | return rc; | |
879 | } | |
7ee1af76 JA |
880 | |
881 | if (!numLock && !numUnlock) { | |
882 | /* if no lock or unlock then nothing | |
883 | to do since we do not know what it is */ | |
884 | FreeXid(xid); | |
885 | return -EOPNOTSUPP; | |
886 | } | |
887 | ||
888 | if (posix_locking) { | |
08547b03 | 889 | int posix_lock_type; |
fb8c4b14 | 890 | if (lockType & LOCKING_ANDX_SHARED_LOCK) |
08547b03 SF |
891 | posix_lock_type = CIFS_RDLCK; |
892 | else | |
893 | posix_lock_type = CIFS_WRLCK; | |
50c2f753 | 894 | |
fb8c4b14 | 895 | if (numUnlock == 1) |
beb84dc8 | 896 | posix_lock_type = CIFS_UNLCK; |
7ee1af76 | 897 | |
13a6e42a | 898 | rc = CIFSSMBPosixLock(xid, tcon, netfid, 0 /* set */, |
fc94cdb9 | 899 | length, pfLock, |
08547b03 | 900 | posix_lock_type, wait_flag); |
7ee1af76 | 901 | } else { |
fb8c4b14 SF |
902 | struct cifsFileInfo *fid = |
903 | (struct cifsFileInfo *)file->private_data; | |
7ee1af76 JA |
904 | |
905 | if (numLock) { | |
13a6e42a | 906 | rc = CIFSSMBLock(xid, tcon, netfid, length, |
fb8c4b14 | 907 | pfLock->fl_start, |
7ee1af76 JA |
908 | 0, numLock, lockType, wait_flag); |
909 | ||
910 | if (rc == 0) { | |
911 | /* For Windows locks we must store them. */ | |
912 | rc = store_file_lock(fid, length, | |
913 | pfLock->fl_start, lockType); | |
914 | } | |
915 | } else if (numUnlock) { | |
916 | /* For each stored lock that this unlock overlaps | |
917 | completely, unlock it. */ | |
918 | int stored_rc = 0; | |
919 | struct cifsLockInfo *li, *tmp; | |
920 | ||
6b70c955 | 921 | rc = 0; |
796e5661 | 922 | mutex_lock(&fid->lock_mutex); |
7ee1af76 JA |
923 | list_for_each_entry_safe(li, tmp, &fid->llist, llist) { |
924 | if (pfLock->fl_start <= li->offset && | |
c19eb710 | 925 | (pfLock->fl_start + length) >= |
39db810c | 926 | (li->offset + li->length)) { |
13a6e42a | 927 | stored_rc = CIFSSMBLock(xid, tcon, |
fb8c4b14 | 928 | netfid, |
7ee1af76 | 929 | li->length, li->offset, |
4b18f2a9 | 930 | 1, 0, li->type, false); |
7ee1af76 JA |
931 | if (stored_rc) |
932 | rc = stored_rc; | |
933 | ||
934 | list_del(&li->llist); | |
935 | kfree(li); | |
936 | } | |
937 | } | |
796e5661 | 938 | mutex_unlock(&fid->lock_mutex); |
7ee1af76 JA |
939 | } |
940 | } | |
941 | ||
d634cc15 | 942 | if (pfLock->fl_flags & FL_POSIX) |
1da177e4 LT |
943 | posix_lock_file_wait(file, pfLock); |
944 | FreeXid(xid); | |
945 | return rc; | |
946 | } | |
947 | ||
fbec9ab9 JL |
948 | /* |
949 | * Set the timeout on write requests past EOF. For some servers (Windows) | |
950 | * these calls can be very long. | |
951 | * | |
952 | * If we're writing >10M past the EOF we give a 180s timeout. Anything less | |
953 | * than that gets a 45s timeout. Writes not past EOF get 15s timeouts. | |
954 | * The 10M cutoff is totally arbitrary. A better scheme for this would be | |
955 | * welcome if someone wants to suggest one. | |
956 | * | |
957 | * We may be able to do a better job with this if there were some way to | |
958 | * declare that a file should be sparse. | |
959 | */ | |
960 | static int | |
961 | cifs_write_timeout(struct cifsInodeInfo *cifsi, loff_t offset) | |
962 | { | |
963 | if (offset <= cifsi->server_eof) | |
964 | return CIFS_STD_OP; | |
965 | else if (offset > (cifsi->server_eof + (10 * 1024 * 1024))) | |
966 | return CIFS_VLONG_OP; | |
967 | else | |
968 | return CIFS_LONG_OP; | |
969 | } | |
970 | ||
971 | /* update the file size (if needed) after a write */ | |
972 | static void | |
973 | cifs_update_eof(struct cifsInodeInfo *cifsi, loff_t offset, | |
974 | unsigned int bytes_written) | |
975 | { | |
976 | loff_t end_of_write = offset + bytes_written; | |
977 | ||
978 | if (end_of_write > cifsi->server_eof) | |
979 | cifsi->server_eof = end_of_write; | |
980 | } | |
981 | ||
1da177e4 LT |
982 | ssize_t cifs_user_write(struct file *file, const char __user *write_data, |
983 | size_t write_size, loff_t *poffset) | |
984 | { | |
985 | int rc = 0; | |
986 | unsigned int bytes_written = 0; | |
987 | unsigned int total_written; | |
988 | struct cifs_sb_info *cifs_sb; | |
989 | struct cifsTconInfo *pTcon; | |
990 | int xid, long_op; | |
991 | struct cifsFileInfo *open_file; | |
fbec9ab9 | 992 | struct cifsInodeInfo *cifsi = CIFS_I(file->f_path.dentry->d_inode); |
1da177e4 | 993 | |
e6a00296 | 994 | cifs_sb = CIFS_SB(file->f_path.dentry->d_sb); |
1da177e4 LT |
995 | |
996 | pTcon = cifs_sb->tcon; | |
997 | ||
998 | /* cFYI(1, | |
999 | (" write %d bytes to offset %lld of %s", write_size, | |
e6a00296 | 1000 | *poffset, file->f_path.dentry->d_name.name)); */ |
1da177e4 LT |
1001 | |
1002 | if (file->private_data == NULL) | |
1003 | return -EBADF; | |
c33f8d32 | 1004 | open_file = (struct cifsFileInfo *) file->private_data; |
50c2f753 | 1005 | |
838726c4 JL |
1006 | rc = generic_write_checks(file, poffset, &write_size, 0); |
1007 | if (rc) | |
1008 | return rc; | |
1009 | ||
1da177e4 | 1010 | xid = GetXid(); |
1da177e4 | 1011 | |
fbec9ab9 | 1012 | long_op = cifs_write_timeout(cifsi, *poffset); |
1da177e4 LT |
1013 | for (total_written = 0; write_size > total_written; |
1014 | total_written += bytes_written) { | |
1015 | rc = -EAGAIN; | |
1016 | while (rc == -EAGAIN) { | |
1017 | if (file->private_data == NULL) { | |
1018 | /* file has been closed on us */ | |
1019 | FreeXid(xid); | |
1020 | /* if we have gotten here we have written some data | |
1021 | and blocked, and the file has been freed on us while | |
1022 | we blocked so return what we managed to write */ | |
1023 | return total_written; | |
fb8c4b14 | 1024 | } |
1da177e4 LT |
1025 | if (open_file->closePend) { |
1026 | FreeXid(xid); | |
1027 | if (total_written) | |
1028 | return total_written; | |
1029 | else | |
1030 | return -EBADF; | |
1031 | } | |
1032 | if (open_file->invalidHandle) { | |
1da177e4 LT |
1033 | /* we could deadlock if we called |
1034 | filemap_fdatawait from here so tell | |
1035 | reopen_file not to flush data to server | |
1036 | now */ | |
4b18f2a9 | 1037 | rc = cifs_reopen_file(file, false); |
1da177e4 LT |
1038 | if (rc != 0) |
1039 | break; | |
1040 | } | |
1041 | ||
1042 | rc = CIFSSMBWrite(xid, pTcon, | |
1043 | open_file->netfid, | |
1044 | min_t(const int, cifs_sb->wsize, | |
1045 | write_size - total_written), | |
1046 | *poffset, &bytes_written, | |
1047 | NULL, write_data + total_written, long_op); | |
1048 | } | |
1049 | if (rc || (bytes_written == 0)) { | |
1050 | if (total_written) | |
1051 | break; | |
1052 | else { | |
1053 | FreeXid(xid); | |
1054 | return rc; | |
1055 | } | |
fbec9ab9 JL |
1056 | } else { |
1057 | cifs_update_eof(cifsi, *poffset, bytes_written); | |
1da177e4 | 1058 | *poffset += bytes_written; |
fbec9ab9 | 1059 | } |
133672ef | 1060 | long_op = CIFS_STD_OP; /* subsequent writes fast - |
1da177e4 LT |
1061 | 15 seconds is plenty */ |
1062 | } | |
1063 | ||
a4544347 | 1064 | cifs_stats_bytes_written(pTcon, total_written); |
1da177e4 LT |
1065 | |
1066 | /* since the write may have blocked check these pointers again */ | |
3677db10 SF |
1067 | if ((file->f_path.dentry) && (file->f_path.dentry->d_inode)) { |
1068 | struct inode *inode = file->f_path.dentry->d_inode; | |
fb8c4b14 SF |
1069 | /* Do not update local mtime - server will set its actual value on write |
1070 | * inode->i_ctime = inode->i_mtime = | |
3677db10 SF |
1071 | * current_fs_time(inode->i_sb);*/ |
1072 | if (total_written > 0) { | |
1073 | spin_lock(&inode->i_lock); | |
1074 | if (*poffset > file->f_path.dentry->d_inode->i_size) | |
1075 | i_size_write(file->f_path.dentry->d_inode, | |
1da177e4 | 1076 | *poffset); |
3677db10 | 1077 | spin_unlock(&inode->i_lock); |
1da177e4 | 1078 | } |
fb8c4b14 | 1079 | mark_inode_dirty_sync(file->f_path.dentry->d_inode); |
1da177e4 LT |
1080 | } |
1081 | FreeXid(xid); | |
1082 | return total_written; | |
1083 | } | |
1084 | ||
1085 | static ssize_t cifs_write(struct file *file, const char *write_data, | |
d9414774 | 1086 | size_t write_size, loff_t *poffset) |
1da177e4 LT |
1087 | { |
1088 | int rc = 0; | |
1089 | unsigned int bytes_written = 0; | |
1090 | unsigned int total_written; | |
1091 | struct cifs_sb_info *cifs_sb; | |
1092 | struct cifsTconInfo *pTcon; | |
1093 | int xid, long_op; | |
1094 | struct cifsFileInfo *open_file; | |
fbec9ab9 | 1095 | struct cifsInodeInfo *cifsi = CIFS_I(file->f_path.dentry->d_inode); |
1da177e4 | 1096 | |
e6a00296 | 1097 | cifs_sb = CIFS_SB(file->f_path.dentry->d_sb); |
1da177e4 LT |
1098 | |
1099 | pTcon = cifs_sb->tcon; | |
1100 | ||
fb8c4b14 | 1101 | cFYI(1, ("write %zd bytes to offset %lld of %s", write_size, |
e6a00296 | 1102 | *poffset, file->f_path.dentry->d_name.name)); |
1da177e4 LT |
1103 | |
1104 | if (file->private_data == NULL) | |
1105 | return -EBADF; | |
c33f8d32 | 1106 | open_file = (struct cifsFileInfo *)file->private_data; |
50c2f753 | 1107 | |
1da177e4 | 1108 | xid = GetXid(); |
1da177e4 | 1109 | |
fbec9ab9 | 1110 | long_op = cifs_write_timeout(cifsi, *poffset); |
1da177e4 LT |
1111 | for (total_written = 0; write_size > total_written; |
1112 | total_written += bytes_written) { | |
1113 | rc = -EAGAIN; | |
1114 | while (rc == -EAGAIN) { | |
1115 | if (file->private_data == NULL) { | |
1116 | /* file has been closed on us */ | |
1117 | FreeXid(xid); | |
1118 | /* if we have gotten here we have written some data | |
1119 | and blocked, and the file has been freed on us | |
fb8c4b14 | 1120 | while we blocked so return what we managed to |
1da177e4 LT |
1121 | write */ |
1122 | return total_written; | |
fb8c4b14 | 1123 | } |
1da177e4 LT |
1124 | if (open_file->closePend) { |
1125 | FreeXid(xid); | |
1126 | if (total_written) | |
1127 | return total_written; | |
1128 | else | |
1129 | return -EBADF; | |
1130 | } | |
1131 | if (open_file->invalidHandle) { | |
1da177e4 LT |
1132 | /* we could deadlock if we called |
1133 | filemap_fdatawait from here so tell | |
fb8c4b14 | 1134 | reopen_file not to flush data to |
1da177e4 | 1135 | server now */ |
4b18f2a9 | 1136 | rc = cifs_reopen_file(file, false); |
1da177e4 LT |
1137 | if (rc != 0) |
1138 | break; | |
1139 | } | |
fb8c4b14 SF |
1140 | if (experimEnabled || (pTcon->ses->server && |
1141 | ((pTcon->ses->server->secMode & | |
08775834 | 1142 | (SECMODE_SIGN_REQUIRED | SECMODE_SIGN_ENABLED)) |
c01f36a8 | 1143 | == 0))) { |
3e84469d SF |
1144 | struct kvec iov[2]; |
1145 | unsigned int len; | |
1146 | ||
0ae0efad | 1147 | len = min((size_t)cifs_sb->wsize, |
3e84469d SF |
1148 | write_size - total_written); |
1149 | /* iov[0] is reserved for smb header */ | |
1150 | iov[1].iov_base = (char *)write_data + | |
1151 | total_written; | |
1152 | iov[1].iov_len = len; | |
d6e04ae6 | 1153 | rc = CIFSSMBWrite2(xid, pTcon, |
3e84469d | 1154 | open_file->netfid, len, |
d6e04ae6 | 1155 | *poffset, &bytes_written, |
3e84469d | 1156 | iov, 1, long_op); |
d6e04ae6 | 1157 | } else |
60808233 SF |
1158 | rc = CIFSSMBWrite(xid, pTcon, |
1159 | open_file->netfid, | |
1160 | min_t(const int, cifs_sb->wsize, | |
1161 | write_size - total_written), | |
1162 | *poffset, &bytes_written, | |
1163 | write_data + total_written, | |
1164 | NULL, long_op); | |
1da177e4 LT |
1165 | } |
1166 | if (rc || (bytes_written == 0)) { | |
1167 | if (total_written) | |
1168 | break; | |
1169 | else { | |
1170 | FreeXid(xid); | |
1171 | return rc; | |
1172 | } | |
fbec9ab9 JL |
1173 | } else { |
1174 | cifs_update_eof(cifsi, *poffset, bytes_written); | |
1da177e4 | 1175 | *poffset += bytes_written; |
fbec9ab9 | 1176 | } |
133672ef | 1177 | long_op = CIFS_STD_OP; /* subsequent writes fast - |
1da177e4 LT |
1178 | 15 seconds is plenty */ |
1179 | } | |
1180 | ||
a4544347 | 1181 | cifs_stats_bytes_written(pTcon, total_written); |
1da177e4 LT |
1182 | |
1183 | /* since the write may have blocked check these pointers again */ | |
3677db10 | 1184 | if ((file->f_path.dentry) && (file->f_path.dentry->d_inode)) { |
004c46b9 | 1185 | /*BB We could make this contingent on superblock ATIME flag too */ |
3677db10 SF |
1186 | /* file->f_path.dentry->d_inode->i_ctime = |
1187 | file->f_path.dentry->d_inode->i_mtime = CURRENT_TIME;*/ | |
1188 | if (total_written > 0) { | |
1189 | spin_lock(&file->f_path.dentry->d_inode->i_lock); | |
1190 | if (*poffset > file->f_path.dentry->d_inode->i_size) | |
1191 | i_size_write(file->f_path.dentry->d_inode, | |
1192 | *poffset); | |
1193 | spin_unlock(&file->f_path.dentry->d_inode->i_lock); | |
1da177e4 | 1194 | } |
3677db10 | 1195 | mark_inode_dirty_sync(file->f_path.dentry->d_inode); |
1da177e4 LT |
1196 | } |
1197 | FreeXid(xid); | |
1198 | return total_written; | |
1199 | } | |
1200 | ||
630f3f0c SF |
1201 | #ifdef CONFIG_CIFS_EXPERIMENTAL |
1202 | struct cifsFileInfo *find_readable_file(struct cifsInodeInfo *cifs_inode) | |
1203 | { | |
1204 | struct cifsFileInfo *open_file = NULL; | |
1205 | ||
1206 | read_lock(&GlobalSMBSeslock); | |
1207 | /* we could simply get the first_list_entry since write-only entries | |
1208 | are always at the end of the list but since the first entry might | |
1209 | have a close pending, we go through the whole list */ | |
1210 | list_for_each_entry(open_file, &cifs_inode->openFileList, flist) { | |
1211 | if (open_file->closePend) | |
1212 | continue; | |
1213 | if (open_file->pfile && ((open_file->pfile->f_flags & O_RDWR) || | |
1214 | (open_file->pfile->f_flags & O_RDONLY))) { | |
1215 | if (!open_file->invalidHandle) { | |
1216 | /* found a good file */ | |
1217 | /* lock it so it will not be closed on us */ | |
6ab409b5 | 1218 | cifsFileInfo_get(open_file); |
630f3f0c SF |
1219 | read_unlock(&GlobalSMBSeslock); |
1220 | return open_file; | |
1221 | } /* else might as well continue, and look for | |
1222 | another, or simply have the caller reopen it | |
1223 | again rather than trying to fix this handle */ | |
1224 | } else /* write only file */ | |
1225 | break; /* write only files are last so must be done */ | |
1226 | } | |
1227 | read_unlock(&GlobalSMBSeslock); | |
1228 | return NULL; | |
1229 | } | |
1230 | #endif | |
1231 | ||
dd99cd80 | 1232 | struct cifsFileInfo *find_writable_file(struct cifsInodeInfo *cifs_inode) |
6148a742 SF |
1233 | { |
1234 | struct cifsFileInfo *open_file; | |
2846d386 | 1235 | bool any_available = false; |
dd99cd80 | 1236 | int rc; |
6148a742 | 1237 | |
60808233 SF |
1238 | /* Having a null inode here (because mapping->host was set to zero by |
1239 | the VFS or MM) should not happen but we had reports of on oops (due to | |
1240 | it being zero) during stress testcases so we need to check for it */ | |
1241 | ||
fb8c4b14 SF |
1242 | if (cifs_inode == NULL) { |
1243 | cERROR(1, ("Null inode passed to cifs_writeable_file")); | |
60808233 SF |
1244 | dump_stack(); |
1245 | return NULL; | |
1246 | } | |
1247 | ||
6148a742 | 1248 | read_lock(&GlobalSMBSeslock); |
9b22b0b7 | 1249 | refind_writable: |
6148a742 | 1250 | list_for_each_entry(open_file, &cifs_inode->openFileList, flist) { |
2846d386 JL |
1251 | if (open_file->closePend || |
1252 | (!any_available && open_file->pid != current->tgid)) | |
6148a742 | 1253 | continue; |
2846d386 | 1254 | |
6148a742 SF |
1255 | if (open_file->pfile && |
1256 | ((open_file->pfile->f_flags & O_RDWR) || | |
1257 | (open_file->pfile->f_flags & O_WRONLY))) { | |
6ab409b5 | 1258 | cifsFileInfo_get(open_file); |
9b22b0b7 SF |
1259 | |
1260 | if (!open_file->invalidHandle) { | |
1261 | /* found a good writable file */ | |
1262 | read_unlock(&GlobalSMBSeslock); | |
1263 | return open_file; | |
1264 | } | |
8840dee9 | 1265 | |
6148a742 | 1266 | read_unlock(&GlobalSMBSeslock); |
9b22b0b7 | 1267 | /* Had to unlock since following call can block */ |
4b18f2a9 | 1268 | rc = cifs_reopen_file(open_file->pfile, false); |
8840dee9 | 1269 | if (!rc) { |
9b22b0b7 SF |
1270 | if (!open_file->closePend) |
1271 | return open_file; | |
1272 | else { /* start over in case this was deleted */ | |
1273 | /* since the list could be modified */ | |
37c0eb46 | 1274 | read_lock(&GlobalSMBSeslock); |
6ab409b5 | 1275 | cifsFileInfo_put(open_file); |
9b22b0b7 | 1276 | goto refind_writable; |
37c0eb46 SF |
1277 | } |
1278 | } | |
9b22b0b7 SF |
1279 | |
1280 | /* if it fails, try another handle if possible - | |
1281 | (we can not do this if closePending since | |
1282 | loop could be modified - in which case we | |
1283 | have to start at the beginning of the list | |
1284 | again. Note that it would be bad | |
1285 | to hold up writepages here (rather than | |
1286 | in caller) with continuous retries */ | |
1287 | cFYI(1, ("wp failed on reopen file")); | |
1288 | read_lock(&GlobalSMBSeslock); | |
1289 | /* can not use this handle, no write | |
1290 | pending on this one after all */ | |
6ab409b5 | 1291 | cifsFileInfo_put(open_file); |
8840dee9 | 1292 | |
9b22b0b7 SF |
1293 | if (open_file->closePend) /* list could have changed */ |
1294 | goto refind_writable; | |
1295 | /* else we simply continue to the next entry. Thus | |
1296 | we do not loop on reopen errors. If we | |
1297 | can not reopen the file, for example if we | |
1298 | reconnected to a server with another client | |
1299 | racing to delete or lock the file we would not | |
1300 | make progress if we restarted before the beginning | |
1301 | of the loop here. */ | |
6148a742 SF |
1302 | } |
1303 | } | |
2846d386 JL |
1304 | /* couldn't find useable FH with same pid, try any available */ |
1305 | if (!any_available) { | |
1306 | any_available = true; | |
1307 | goto refind_writable; | |
1308 | } | |
6148a742 SF |
1309 | read_unlock(&GlobalSMBSeslock); |
1310 | return NULL; | |
1311 | } | |
1312 | ||
1da177e4 LT |
1313 | static int cifs_partialpagewrite(struct page *page, unsigned from, unsigned to) |
1314 | { | |
1315 | struct address_space *mapping = page->mapping; | |
1316 | loff_t offset = (loff_t)page->index << PAGE_CACHE_SHIFT; | |
1317 | char *write_data; | |
1318 | int rc = -EFAULT; | |
1319 | int bytes_written = 0; | |
1320 | struct cifs_sb_info *cifs_sb; | |
1321 | struct cifsTconInfo *pTcon; | |
1322 | struct inode *inode; | |
6148a742 | 1323 | struct cifsFileInfo *open_file; |
1da177e4 LT |
1324 | |
1325 | if (!mapping || !mapping->host) | |
1326 | return -EFAULT; | |
1327 | ||
1328 | inode = page->mapping->host; | |
1329 | cifs_sb = CIFS_SB(inode->i_sb); | |
1330 | pTcon = cifs_sb->tcon; | |
1331 | ||
1332 | offset += (loff_t)from; | |
1333 | write_data = kmap(page); | |
1334 | write_data += from; | |
1335 | ||
1336 | if ((to > PAGE_CACHE_SIZE) || (from > to)) { | |
1337 | kunmap(page); | |
1338 | return -EIO; | |
1339 | } | |
1340 | ||
1341 | /* racing with truncate? */ | |
1342 | if (offset > mapping->host->i_size) { | |
1343 | kunmap(page); | |
1344 | return 0; /* don't care */ | |
1345 | } | |
1346 | ||
1347 | /* check to make sure that we are not extending the file */ | |
1348 | if (mapping->host->i_size - offset < (loff_t)to) | |
fb8c4b14 | 1349 | to = (unsigned)(mapping->host->i_size - offset); |
1da177e4 | 1350 | |
6148a742 SF |
1351 | open_file = find_writable_file(CIFS_I(mapping->host)); |
1352 | if (open_file) { | |
1353 | bytes_written = cifs_write(open_file->pfile, write_data, | |
1354 | to-from, &offset); | |
6ab409b5 | 1355 | cifsFileInfo_put(open_file); |
1da177e4 | 1356 | /* Does mm or vfs already set times? */ |
6148a742 | 1357 | inode->i_atime = inode->i_mtime = current_fs_time(inode->i_sb); |
bb5a9a04 | 1358 | if ((bytes_written > 0) && (offset)) |
6148a742 | 1359 | rc = 0; |
bb5a9a04 SF |
1360 | else if (bytes_written < 0) |
1361 | rc = bytes_written; | |
6148a742 | 1362 | } else { |
1da177e4 LT |
1363 | cFYI(1, ("No writeable filehandles for inode")); |
1364 | rc = -EIO; | |
1365 | } | |
1366 | ||
1367 | kunmap(page); | |
1368 | return rc; | |
1369 | } | |
1370 | ||
1da177e4 | 1371 | static int cifs_writepages(struct address_space *mapping, |
37c0eb46 | 1372 | struct writeback_control *wbc) |
1da177e4 | 1373 | { |
37c0eb46 SF |
1374 | struct backing_dev_info *bdi = mapping->backing_dev_info; |
1375 | unsigned int bytes_to_write; | |
1376 | unsigned int bytes_written; | |
1377 | struct cifs_sb_info *cifs_sb; | |
1378 | int done = 0; | |
111ebb6e | 1379 | pgoff_t end; |
37c0eb46 | 1380 | pgoff_t index; |
fb8c4b14 SF |
1381 | int range_whole = 0; |
1382 | struct kvec *iov; | |
84d2f07e | 1383 | int len; |
37c0eb46 SF |
1384 | int n_iov = 0; |
1385 | pgoff_t next; | |
1386 | int nr_pages; | |
1387 | __u64 offset = 0; | |
23e7dd7d | 1388 | struct cifsFileInfo *open_file; |
fbec9ab9 | 1389 | struct cifsInodeInfo *cifsi = CIFS_I(mapping->host); |
37c0eb46 SF |
1390 | struct page *page; |
1391 | struct pagevec pvec; | |
1392 | int rc = 0; | |
1393 | int scanned = 0; | |
fbec9ab9 | 1394 | int xid, long_op; |
1da177e4 | 1395 | |
37c0eb46 | 1396 | cifs_sb = CIFS_SB(mapping->host->i_sb); |
50c2f753 | 1397 | |
37c0eb46 SF |
1398 | /* |
1399 | * If wsize is smaller that the page cache size, default to writing | |
1400 | * one page at a time via cifs_writepage | |
1401 | */ | |
1402 | if (cifs_sb->wsize < PAGE_CACHE_SIZE) | |
1403 | return generic_writepages(mapping, wbc); | |
1404 | ||
fb8c4b14 SF |
1405 | if ((cifs_sb->tcon->ses) && (cifs_sb->tcon->ses->server)) |
1406 | if (cifs_sb->tcon->ses->server->secMode & | |
1407 | (SECMODE_SIGN_REQUIRED | SECMODE_SIGN_ENABLED)) | |
1408 | if (!experimEnabled) | |
60808233 | 1409 | return generic_writepages(mapping, wbc); |
4a77118c | 1410 | |
9a0c8230 | 1411 | iov = kmalloc(32 * sizeof(struct kvec), GFP_KERNEL); |
fb8c4b14 | 1412 | if (iov == NULL) |
9a0c8230 SF |
1413 | return generic_writepages(mapping, wbc); |
1414 | ||
1415 | ||
37c0eb46 SF |
1416 | /* |
1417 | * BB: Is this meaningful for a non-block-device file system? | |
1418 | * If it is, we should test it again after we do I/O | |
1419 | */ | |
1420 | if (wbc->nonblocking && bdi_write_congested(bdi)) { | |
1421 | wbc->encountered_congestion = 1; | |
9a0c8230 | 1422 | kfree(iov); |
37c0eb46 SF |
1423 | return 0; |
1424 | } | |
1425 | ||
1da177e4 LT |
1426 | xid = GetXid(); |
1427 | ||
37c0eb46 | 1428 | pagevec_init(&pvec, 0); |
111ebb6e | 1429 | if (wbc->range_cyclic) { |
37c0eb46 | 1430 | index = mapping->writeback_index; /* Start from prev offset */ |
111ebb6e OH |
1431 | end = -1; |
1432 | } else { | |
1433 | index = wbc->range_start >> PAGE_CACHE_SHIFT; | |
1434 | end = wbc->range_end >> PAGE_CACHE_SHIFT; | |
1435 | if (wbc->range_start == 0 && wbc->range_end == LLONG_MAX) | |
1436 | range_whole = 1; | |
37c0eb46 SF |
1437 | scanned = 1; |
1438 | } | |
1439 | retry: | |
1440 | while (!done && (index <= end) && | |
1441 | (nr_pages = pagevec_lookup_tag(&pvec, mapping, &index, | |
1442 | PAGECACHE_TAG_DIRTY, | |
1443 | min(end - index, (pgoff_t)PAGEVEC_SIZE - 1) + 1))) { | |
1444 | int first; | |
1445 | unsigned int i; | |
1446 | ||
37c0eb46 SF |
1447 | first = -1; |
1448 | next = 0; | |
1449 | n_iov = 0; | |
1450 | bytes_to_write = 0; | |
1451 | ||
1452 | for (i = 0; i < nr_pages; i++) { | |
1453 | page = pvec.pages[i]; | |
1454 | /* | |
1455 | * At this point we hold neither mapping->tree_lock nor | |
1456 | * lock on the page itself: the page may be truncated or | |
1457 | * invalidated (changing page->mapping to NULL), or even | |
1458 | * swizzled back from swapper_space to tmpfs file | |
1459 | * mapping | |
1460 | */ | |
1461 | ||
1462 | if (first < 0) | |
1463 | lock_page(page); | |
529ae9aa | 1464 | else if (!trylock_page(page)) |
37c0eb46 SF |
1465 | break; |
1466 | ||
1467 | if (unlikely(page->mapping != mapping)) { | |
1468 | unlock_page(page); | |
1469 | break; | |
1470 | } | |
1471 | ||
111ebb6e | 1472 | if (!wbc->range_cyclic && page->index > end) { |
37c0eb46 SF |
1473 | done = 1; |
1474 | unlock_page(page); | |
1475 | break; | |
1476 | } | |
1477 | ||
1478 | if (next && (page->index != next)) { | |
1479 | /* Not next consecutive page */ | |
1480 | unlock_page(page); | |
1481 | break; | |
1482 | } | |
1483 | ||
1484 | if (wbc->sync_mode != WB_SYNC_NONE) | |
1485 | wait_on_page_writeback(page); | |
1486 | ||
1487 | if (PageWriteback(page) || | |
cb876f45 | 1488 | !clear_page_dirty_for_io(page)) { |
37c0eb46 SF |
1489 | unlock_page(page); |
1490 | break; | |
1491 | } | |
84d2f07e | 1492 | |
cb876f45 LT |
1493 | /* |
1494 | * This actually clears the dirty bit in the radix tree. | |
1495 | * See cifs_writepage() for more commentary. | |
1496 | */ | |
1497 | set_page_writeback(page); | |
1498 | ||
84d2f07e SF |
1499 | if (page_offset(page) >= mapping->host->i_size) { |
1500 | done = 1; | |
1501 | unlock_page(page); | |
cb876f45 | 1502 | end_page_writeback(page); |
84d2f07e SF |
1503 | break; |
1504 | } | |
1505 | ||
37c0eb46 SF |
1506 | /* |
1507 | * BB can we get rid of this? pages are held by pvec | |
1508 | */ | |
1509 | page_cache_get(page); | |
1510 | ||
84d2f07e SF |
1511 | len = min(mapping->host->i_size - page_offset(page), |
1512 | (loff_t)PAGE_CACHE_SIZE); | |
1513 | ||
37c0eb46 SF |
1514 | /* reserve iov[0] for the smb header */ |
1515 | n_iov++; | |
1516 | iov[n_iov].iov_base = kmap(page); | |
84d2f07e SF |
1517 | iov[n_iov].iov_len = len; |
1518 | bytes_to_write += len; | |
37c0eb46 SF |
1519 | |
1520 | if (first < 0) { | |
1521 | first = i; | |
1522 | offset = page_offset(page); | |
1523 | } | |
1524 | next = page->index + 1; | |
1525 | if (bytes_to_write + PAGE_CACHE_SIZE > cifs_sb->wsize) | |
1526 | break; | |
1527 | } | |
1528 | if (n_iov) { | |
23e7dd7d SF |
1529 | /* Search for a writable handle every time we call |
1530 | * CIFSSMBWrite2. We can't rely on the last handle | |
1531 | * we used to still be valid | |
1532 | */ | |
1533 | open_file = find_writable_file(CIFS_I(mapping->host)); | |
1534 | if (!open_file) { | |
1535 | cERROR(1, ("No writable handles for inode")); | |
1536 | rc = -EBADF; | |
1047abc1 | 1537 | } else { |
fbec9ab9 | 1538 | long_op = cifs_write_timeout(cifsi, offset); |
23e7dd7d SF |
1539 | rc = CIFSSMBWrite2(xid, cifs_sb->tcon, |
1540 | open_file->netfid, | |
1541 | bytes_to_write, offset, | |
1542 | &bytes_written, iov, n_iov, | |
fbec9ab9 | 1543 | long_op); |
6ab409b5 | 1544 | cifsFileInfo_put(open_file); |
fbec9ab9 JL |
1545 | cifs_update_eof(cifsi, offset, bytes_written); |
1546 | ||
23e7dd7d | 1547 | if (rc || bytes_written < bytes_to_write) { |
63135e08 | 1548 | cERROR(1, ("Write2 ret %d, wrote %d", |
23e7dd7d SF |
1549 | rc, bytes_written)); |
1550 | /* BB what if continued retry is | |
1551 | requested via mount flags? */ | |
cea21805 JL |
1552 | if (rc == -ENOSPC) |
1553 | set_bit(AS_ENOSPC, &mapping->flags); | |
1554 | else | |
1555 | set_bit(AS_EIO, &mapping->flags); | |
23e7dd7d SF |
1556 | } else { |
1557 | cifs_stats_bytes_written(cifs_sb->tcon, | |
1558 | bytes_written); | |
1559 | } | |
37c0eb46 SF |
1560 | } |
1561 | for (i = 0; i < n_iov; i++) { | |
1562 | page = pvec.pages[first + i]; | |
eb9bdaa3 SF |
1563 | /* Should we also set page error on |
1564 | success rc but too little data written? */ | |
1565 | /* BB investigate retry logic on temporary | |
1566 | server crash cases and how recovery works | |
fb8c4b14 SF |
1567 | when page marked as error */ |
1568 | if (rc) | |
eb9bdaa3 | 1569 | SetPageError(page); |
37c0eb46 SF |
1570 | kunmap(page); |
1571 | unlock_page(page); | |
cb876f45 | 1572 | end_page_writeback(page); |
37c0eb46 SF |
1573 | page_cache_release(page); |
1574 | } | |
1575 | if ((wbc->nr_to_write -= n_iov) <= 0) | |
1576 | done = 1; | |
1577 | index = next; | |
b066a48c DK |
1578 | } else |
1579 | /* Need to re-find the pages we skipped */ | |
1580 | index = pvec.pages[0]->index + 1; | |
1581 | ||
37c0eb46 SF |
1582 | pagevec_release(&pvec); |
1583 | } | |
1584 | if (!scanned && !done) { | |
1585 | /* | |
1586 | * We hit the last page and there is more work to be done: wrap | |
1587 | * back to the start of the file | |
1588 | */ | |
1589 | scanned = 1; | |
1590 | index = 0; | |
1591 | goto retry; | |
1592 | } | |
111ebb6e | 1593 | if (wbc->range_cyclic || (range_whole && wbc->nr_to_write > 0)) |
37c0eb46 SF |
1594 | mapping->writeback_index = index; |
1595 | ||
1da177e4 | 1596 | FreeXid(xid); |
9a0c8230 | 1597 | kfree(iov); |
1da177e4 LT |
1598 | return rc; |
1599 | } | |
1da177e4 | 1600 | |
fb8c4b14 | 1601 | static int cifs_writepage(struct page *page, struct writeback_control *wbc) |
1da177e4 LT |
1602 | { |
1603 | int rc = -EFAULT; | |
1604 | int xid; | |
1605 | ||
1606 | xid = GetXid(); | |
1607 | /* BB add check for wbc flags */ | |
1608 | page_cache_get(page); | |
ad7a2926 | 1609 | if (!PageUptodate(page)) |
1da177e4 | 1610 | cFYI(1, ("ppw - page not up to date")); |
cb876f45 LT |
1611 | |
1612 | /* | |
1613 | * Set the "writeback" flag, and clear "dirty" in the radix tree. | |
1614 | * | |
1615 | * A writepage() implementation always needs to do either this, | |
1616 | * or re-dirty the page with "redirty_page_for_writepage()" in | |
1617 | * the case of a failure. | |
1618 | * | |
1619 | * Just unlocking the page will cause the radix tree tag-bits | |
1620 | * to fail to update with the state of the page correctly. | |
1621 | */ | |
fb8c4b14 | 1622 | set_page_writeback(page); |
1da177e4 LT |
1623 | rc = cifs_partialpagewrite(page, 0, PAGE_CACHE_SIZE); |
1624 | SetPageUptodate(page); /* BB add check for error and Clearuptodate? */ | |
1625 | unlock_page(page); | |
cb876f45 LT |
1626 | end_page_writeback(page); |
1627 | page_cache_release(page); | |
1da177e4 LT |
1628 | FreeXid(xid); |
1629 | return rc; | |
1630 | } | |
1631 | ||
d9414774 NP |
1632 | static int cifs_write_end(struct file *file, struct address_space *mapping, |
1633 | loff_t pos, unsigned len, unsigned copied, | |
1634 | struct page *page, void *fsdata) | |
1da177e4 | 1635 | { |
d9414774 NP |
1636 | int rc; |
1637 | struct inode *inode = mapping->host; | |
1da177e4 | 1638 | |
d9414774 NP |
1639 | cFYI(1, ("write_end for page %p from pos %lld with %d bytes", |
1640 | page, pos, copied)); | |
1641 | ||
a98ee8c1 JL |
1642 | if (PageChecked(page)) { |
1643 | if (copied == len) | |
1644 | SetPageUptodate(page); | |
1645 | ClearPageChecked(page); | |
1646 | } else if (!PageUptodate(page) && copied == PAGE_CACHE_SIZE) | |
d9414774 | 1647 | SetPageUptodate(page); |
ad7a2926 | 1648 | |
1da177e4 | 1649 | if (!PageUptodate(page)) { |
d9414774 NP |
1650 | char *page_data; |
1651 | unsigned offset = pos & (PAGE_CACHE_SIZE - 1); | |
1652 | int xid; | |
1653 | ||
1654 | xid = GetXid(); | |
1da177e4 LT |
1655 | /* this is probably better than directly calling |
1656 | partialpage_write since in this function the file handle is | |
1657 | known which we might as well leverage */ | |
1658 | /* BB check if anything else missing out of ppw | |
1659 | such as updating last write time */ | |
1660 | page_data = kmap(page); | |
d9414774 NP |
1661 | rc = cifs_write(file, page_data + offset, copied, &pos); |
1662 | /* if (rc < 0) should we set writebehind rc? */ | |
1da177e4 | 1663 | kunmap(page); |
d9414774 NP |
1664 | |
1665 | FreeXid(xid); | |
fb8c4b14 | 1666 | } else { |
d9414774 NP |
1667 | rc = copied; |
1668 | pos += copied; | |
1da177e4 LT |
1669 | set_page_dirty(page); |
1670 | } | |
1671 | ||
d9414774 NP |
1672 | if (rc > 0) { |
1673 | spin_lock(&inode->i_lock); | |
1674 | if (pos > inode->i_size) | |
1675 | i_size_write(inode, pos); | |
1676 | spin_unlock(&inode->i_lock); | |
1677 | } | |
1678 | ||
1679 | unlock_page(page); | |
1680 | page_cache_release(page); | |
1681 | ||
1da177e4 LT |
1682 | return rc; |
1683 | } | |
1684 | ||
1685 | int cifs_fsync(struct file *file, struct dentry *dentry, int datasync) | |
1686 | { | |
1687 | int xid; | |
1688 | int rc = 0; | |
b298f223 SF |
1689 | struct cifsTconInfo *tcon; |
1690 | struct cifsFileInfo *smbfile = | |
1691 | (struct cifsFileInfo *)file->private_data; | |
e6a00296 | 1692 | struct inode *inode = file->f_path.dentry->d_inode; |
1da177e4 LT |
1693 | |
1694 | xid = GetXid(); | |
1695 | ||
fb8c4b14 | 1696 | cFYI(1, ("Sync file - name: %s datasync: 0x%x", |
1da177e4 | 1697 | dentry->d_name.name, datasync)); |
50c2f753 | 1698 | |
cea21805 JL |
1699 | rc = filemap_write_and_wait(inode->i_mapping); |
1700 | if (rc == 0) { | |
1701 | rc = CIFS_I(inode)->write_behind_rc; | |
1da177e4 | 1702 | CIFS_I(inode)->write_behind_rc = 0; |
b298f223 | 1703 | tcon = CIFS_SB(inode->i_sb)->tcon; |
be652445 | 1704 | if (!rc && tcon && smbfile && |
4717bed6 | 1705 | !(CIFS_SB(inode->i_sb)->mnt_cifs_flags & CIFS_MOUNT_NOSSYNC)) |
b298f223 | 1706 | rc = CIFSSMBFlush(xid, tcon, smbfile->netfid); |
cea21805 | 1707 | } |
b298f223 | 1708 | |
1da177e4 LT |
1709 | FreeXid(xid); |
1710 | return rc; | |
1711 | } | |
1712 | ||
3978d717 | 1713 | /* static void cifs_sync_page(struct page *page) |
1da177e4 LT |
1714 | { |
1715 | struct address_space *mapping; | |
1716 | struct inode *inode; | |
1717 | unsigned long index = page->index; | |
1718 | unsigned int rpages = 0; | |
1719 | int rc = 0; | |
1720 | ||
1721 | cFYI(1, ("sync page %p",page)); | |
1722 | mapping = page->mapping; | |
1723 | if (!mapping) | |
1724 | return 0; | |
1725 | inode = mapping->host; | |
1726 | if (!inode) | |
3978d717 | 1727 | return; */ |
1da177e4 | 1728 | |
fb8c4b14 | 1729 | /* fill in rpages then |
1da177e4 LT |
1730 | result = cifs_pagein_inode(inode, index, rpages); */ /* BB finish */ |
1731 | ||
26a21b98 | 1732 | /* cFYI(1, ("rpages is %d for sync page of Index %ld", rpages, index)); |
1da177e4 | 1733 | |
3978d717 | 1734 | #if 0 |
1da177e4 LT |
1735 | if (rc < 0) |
1736 | return rc; | |
1737 | return 0; | |
3978d717 | 1738 | #endif |
1da177e4 LT |
1739 | } */ |
1740 | ||
1741 | /* | |
1742 | * As file closes, flush all cached write data for this inode checking | |
1743 | * for write behind errors. | |
1744 | */ | |
75e1fcc0 | 1745 | int cifs_flush(struct file *file, fl_owner_t id) |
1da177e4 | 1746 | { |
fb8c4b14 | 1747 | struct inode *inode = file->f_path.dentry->d_inode; |
1da177e4 LT |
1748 | int rc = 0; |
1749 | ||
1750 | /* Rather than do the steps manually: | |
1751 | lock the inode for writing | |
1752 | loop through pages looking for write behind data (dirty pages) | |
1753 | coalesce into contiguous 16K (or smaller) chunks to write to server | |
1754 | send to server (prefer in parallel) | |
1755 | deal with writebehind errors | |
1756 | unlock inode for writing | |
1757 | filemapfdatawrite appears easier for the time being */ | |
1758 | ||
1759 | rc = filemap_fdatawrite(inode->i_mapping); | |
cea21805 JL |
1760 | /* reset wb rc if we were able to write out dirty pages */ |
1761 | if (!rc) { | |
1762 | rc = CIFS_I(inode)->write_behind_rc; | |
1da177e4 | 1763 | CIFS_I(inode)->write_behind_rc = 0; |
cea21805 | 1764 | } |
50c2f753 | 1765 | |
fb8c4b14 | 1766 | cFYI(1, ("Flush inode %p file %p rc %d", inode, file, rc)); |
1da177e4 LT |
1767 | |
1768 | return rc; | |
1769 | } | |
1770 | ||
1771 | ssize_t cifs_user_read(struct file *file, char __user *read_data, | |
1772 | size_t read_size, loff_t *poffset) | |
1773 | { | |
1774 | int rc = -EACCES; | |
1775 | unsigned int bytes_read = 0; | |
1776 | unsigned int total_read = 0; | |
1777 | unsigned int current_read_size; | |
1778 | struct cifs_sb_info *cifs_sb; | |
1779 | struct cifsTconInfo *pTcon; | |
1780 | int xid; | |
1781 | struct cifsFileInfo *open_file; | |
1782 | char *smb_read_data; | |
1783 | char __user *current_offset; | |
1784 | struct smb_com_read_rsp *pSMBr; | |
1785 | ||
1786 | xid = GetXid(); | |
e6a00296 | 1787 | cifs_sb = CIFS_SB(file->f_path.dentry->d_sb); |
1da177e4 LT |
1788 | pTcon = cifs_sb->tcon; |
1789 | ||
1790 | if (file->private_data == NULL) { | |
0f3bc09e | 1791 | rc = -EBADF; |
1da177e4 | 1792 | FreeXid(xid); |
0f3bc09e | 1793 | return rc; |
1da177e4 LT |
1794 | } |
1795 | open_file = (struct cifsFileInfo *)file->private_data; | |
1796 | ||
ad7a2926 | 1797 | if ((file->f_flags & O_ACCMODE) == O_WRONLY) |
1da177e4 | 1798 | cFYI(1, ("attempting read on write only file instance")); |
ad7a2926 | 1799 | |
1da177e4 LT |
1800 | for (total_read = 0, current_offset = read_data; |
1801 | read_size > total_read; | |
1802 | total_read += bytes_read, current_offset += bytes_read) { | |
fb8c4b14 | 1803 | current_read_size = min_t(const int, read_size - total_read, |
1da177e4 LT |
1804 | cifs_sb->rsize); |
1805 | rc = -EAGAIN; | |
1806 | smb_read_data = NULL; | |
1807 | while (rc == -EAGAIN) { | |
ec637e3f | 1808 | int buf_type = CIFS_NO_BUFFER; |
fb8c4b14 | 1809 | if ((open_file->invalidHandle) && |
1da177e4 | 1810 | (!open_file->closePend)) { |
4b18f2a9 | 1811 | rc = cifs_reopen_file(file, true); |
1da177e4 LT |
1812 | if (rc != 0) |
1813 | break; | |
1814 | } | |
bfa0d75a | 1815 | rc = CIFSSMBRead(xid, pTcon, |
ec637e3f SF |
1816 | open_file->netfid, |
1817 | current_read_size, *poffset, | |
1818 | &bytes_read, &smb_read_data, | |
1819 | &buf_type); | |
1da177e4 | 1820 | pSMBr = (struct smb_com_read_rsp *)smb_read_data; |
1da177e4 | 1821 | if (smb_read_data) { |
93544cc6 SF |
1822 | if (copy_to_user(current_offset, |
1823 | smb_read_data + | |
1824 | 4 /* RFC1001 length field */ + | |
1825 | le16_to_cpu(pSMBr->DataOffset), | |
ad7a2926 | 1826 | bytes_read)) |
93544cc6 | 1827 | rc = -EFAULT; |
93544cc6 | 1828 | |
fb8c4b14 | 1829 | if (buf_type == CIFS_SMALL_BUFFER) |
ec637e3f | 1830 | cifs_small_buf_release(smb_read_data); |
fb8c4b14 | 1831 | else if (buf_type == CIFS_LARGE_BUFFER) |
ec637e3f | 1832 | cifs_buf_release(smb_read_data); |
1da177e4 LT |
1833 | smb_read_data = NULL; |
1834 | } | |
1835 | } | |
1836 | if (rc || (bytes_read == 0)) { | |
1837 | if (total_read) { | |
1838 | break; | |
1839 | } else { | |
1840 | FreeXid(xid); | |
1841 | return rc; | |
1842 | } | |
1843 | } else { | |
a4544347 | 1844 | cifs_stats_bytes_read(pTcon, bytes_read); |
1da177e4 LT |
1845 | *poffset += bytes_read; |
1846 | } | |
1847 | } | |
1848 | FreeXid(xid); | |
1849 | return total_read; | |
1850 | } | |
1851 | ||
1852 | ||
1853 | static ssize_t cifs_read(struct file *file, char *read_data, size_t read_size, | |
1854 | loff_t *poffset) | |
1855 | { | |
1856 | int rc = -EACCES; | |
1857 | unsigned int bytes_read = 0; | |
1858 | unsigned int total_read; | |
1859 | unsigned int current_read_size; | |
1860 | struct cifs_sb_info *cifs_sb; | |
1861 | struct cifsTconInfo *pTcon; | |
1862 | int xid; | |
1863 | char *current_offset; | |
1864 | struct cifsFileInfo *open_file; | |
ec637e3f | 1865 | int buf_type = CIFS_NO_BUFFER; |
1da177e4 LT |
1866 | |
1867 | xid = GetXid(); | |
e6a00296 | 1868 | cifs_sb = CIFS_SB(file->f_path.dentry->d_sb); |
1da177e4 LT |
1869 | pTcon = cifs_sb->tcon; |
1870 | ||
1871 | if (file->private_data == NULL) { | |
0f3bc09e | 1872 | rc = -EBADF; |
1da177e4 | 1873 | FreeXid(xid); |
0f3bc09e | 1874 | return rc; |
1da177e4 LT |
1875 | } |
1876 | open_file = (struct cifsFileInfo *)file->private_data; | |
1877 | ||
1878 | if ((file->f_flags & O_ACCMODE) == O_WRONLY) | |
1879 | cFYI(1, ("attempting read on write only file instance")); | |
1880 | ||
fb8c4b14 | 1881 | for (total_read = 0, current_offset = read_data; |
1da177e4 LT |
1882 | read_size > total_read; |
1883 | total_read += bytes_read, current_offset += bytes_read) { | |
1884 | current_read_size = min_t(const int, read_size - total_read, | |
1885 | cifs_sb->rsize); | |
f9f5c817 SF |
1886 | /* For windows me and 9x we do not want to request more |
1887 | than it negotiated since it will refuse the read then */ | |
fb8c4b14 | 1888 | if ((pTcon->ses) && |
f9f5c817 SF |
1889 | !(pTcon->ses->capabilities & CAP_LARGE_FILES)) { |
1890 | current_read_size = min_t(const int, current_read_size, | |
1891 | pTcon->ses->server->maxBuf - 128); | |
1892 | } | |
1da177e4 LT |
1893 | rc = -EAGAIN; |
1894 | while (rc == -EAGAIN) { | |
fb8c4b14 | 1895 | if ((open_file->invalidHandle) && |
1da177e4 | 1896 | (!open_file->closePend)) { |
4b18f2a9 | 1897 | rc = cifs_reopen_file(file, true); |
1da177e4 LT |
1898 | if (rc != 0) |
1899 | break; | |
1900 | } | |
bfa0d75a | 1901 | rc = CIFSSMBRead(xid, pTcon, |
ec637e3f SF |
1902 | open_file->netfid, |
1903 | current_read_size, *poffset, | |
1904 | &bytes_read, ¤t_offset, | |
1905 | &buf_type); | |
1da177e4 LT |
1906 | } |
1907 | if (rc || (bytes_read == 0)) { | |
1908 | if (total_read) { | |
1909 | break; | |
1910 | } else { | |
1911 | FreeXid(xid); | |
1912 | return rc; | |
1913 | } | |
1914 | } else { | |
a4544347 | 1915 | cifs_stats_bytes_read(pTcon, total_read); |
1da177e4 LT |
1916 | *poffset += bytes_read; |
1917 | } | |
1918 | } | |
1919 | FreeXid(xid); | |
1920 | return total_read; | |
1921 | } | |
1922 | ||
1923 | int cifs_file_mmap(struct file *file, struct vm_area_struct *vma) | |
1924 | { | |
e6a00296 | 1925 | struct dentry *dentry = file->f_path.dentry; |
1da177e4 LT |
1926 | int rc, xid; |
1927 | ||
1928 | xid = GetXid(); | |
1929 | rc = cifs_revalidate(dentry); | |
1930 | if (rc) { | |
1931 | cFYI(1, ("Validation prior to mmap failed, error=%d", rc)); | |
1932 | FreeXid(xid); | |
1933 | return rc; | |
1934 | } | |
1935 | rc = generic_file_mmap(file, vma); | |
1936 | FreeXid(xid); | |
1937 | return rc; | |
1938 | } | |
1939 | ||
1940 | ||
fb8c4b14 | 1941 | static void cifs_copy_cache_pages(struct address_space *mapping, |
1da177e4 LT |
1942 | struct list_head *pages, int bytes_read, char *data, |
1943 | struct pagevec *plru_pvec) | |
1944 | { | |
1945 | struct page *page; | |
1946 | char *target; | |
1947 | ||
1948 | while (bytes_read > 0) { | |
1949 | if (list_empty(pages)) | |
1950 | break; | |
1951 | ||
1952 | page = list_entry(pages->prev, struct page, lru); | |
1953 | list_del(&page->lru); | |
1954 | ||
1955 | if (add_to_page_cache(page, mapping, page->index, | |
1956 | GFP_KERNEL)) { | |
1957 | page_cache_release(page); | |
1958 | cFYI(1, ("Add page cache failed")); | |
3079ca62 SF |
1959 | data += PAGE_CACHE_SIZE; |
1960 | bytes_read -= PAGE_CACHE_SIZE; | |
1da177e4 LT |
1961 | continue; |
1962 | } | |
1963 | ||
fb8c4b14 | 1964 | target = kmap_atomic(page, KM_USER0); |
1da177e4 LT |
1965 | |
1966 | if (PAGE_CACHE_SIZE > bytes_read) { | |
1967 | memcpy(target, data, bytes_read); | |
1968 | /* zero the tail end of this partial page */ | |
fb8c4b14 | 1969 | memset(target + bytes_read, 0, |
1da177e4 LT |
1970 | PAGE_CACHE_SIZE - bytes_read); |
1971 | bytes_read = 0; | |
1972 | } else { | |
1973 | memcpy(target, data, PAGE_CACHE_SIZE); | |
1974 | bytes_read -= PAGE_CACHE_SIZE; | |
1975 | } | |
1976 | kunmap_atomic(target, KM_USER0); | |
1977 | ||
1978 | flush_dcache_page(page); | |
1979 | SetPageUptodate(page); | |
1980 | unlock_page(page); | |
1981 | if (!pagevec_add(plru_pvec, page)) | |
4f98a2fe | 1982 | __pagevec_lru_add_file(plru_pvec); |
1da177e4 LT |
1983 | data += PAGE_CACHE_SIZE; |
1984 | } | |
1985 | return; | |
1986 | } | |
1987 | ||
1988 | static int cifs_readpages(struct file *file, struct address_space *mapping, | |
1989 | struct list_head *page_list, unsigned num_pages) | |
1990 | { | |
1991 | int rc = -EACCES; | |
1992 | int xid; | |
1993 | loff_t offset; | |
1994 | struct page *page; | |
1995 | struct cifs_sb_info *cifs_sb; | |
1996 | struct cifsTconInfo *pTcon; | |
2c2130e1 | 1997 | unsigned int bytes_read = 0; |
fb8c4b14 | 1998 | unsigned int read_size, i; |
1da177e4 LT |
1999 | char *smb_read_data = NULL; |
2000 | struct smb_com_read_rsp *pSMBr; | |
2001 | struct pagevec lru_pvec; | |
2002 | struct cifsFileInfo *open_file; | |
ec637e3f | 2003 | int buf_type = CIFS_NO_BUFFER; |
1da177e4 LT |
2004 | |
2005 | xid = GetXid(); | |
2006 | if (file->private_data == NULL) { | |
0f3bc09e | 2007 | rc = -EBADF; |
1da177e4 | 2008 | FreeXid(xid); |
0f3bc09e | 2009 | return rc; |
1da177e4 LT |
2010 | } |
2011 | open_file = (struct cifsFileInfo *)file->private_data; | |
e6a00296 | 2012 | cifs_sb = CIFS_SB(file->f_path.dentry->d_sb); |
1da177e4 | 2013 | pTcon = cifs_sb->tcon; |
bfa0d75a | 2014 | |
1da177e4 | 2015 | pagevec_init(&lru_pvec, 0); |
61de800d | 2016 | cFYI(DBG2, ("rpages: num pages %d", num_pages)); |
1da177e4 LT |
2017 | for (i = 0; i < num_pages; ) { |
2018 | unsigned contig_pages; | |
2019 | struct page *tmp_page; | |
2020 | unsigned long expected_index; | |
2021 | ||
2022 | if (list_empty(page_list)) | |
2023 | break; | |
2024 | ||
2025 | page = list_entry(page_list->prev, struct page, lru); | |
2026 | offset = (loff_t)page->index << PAGE_CACHE_SHIFT; | |
2027 | ||
2028 | /* count adjacent pages that we will read into */ | |
2029 | contig_pages = 0; | |
fb8c4b14 | 2030 | expected_index = |
1da177e4 | 2031 | list_entry(page_list->prev, struct page, lru)->index; |
fb8c4b14 | 2032 | list_for_each_entry_reverse(tmp_page, page_list, lru) { |
1da177e4 LT |
2033 | if (tmp_page->index == expected_index) { |
2034 | contig_pages++; | |
2035 | expected_index++; | |
2036 | } else | |
fb8c4b14 | 2037 | break; |
1da177e4 LT |
2038 | } |
2039 | if (contig_pages + i > num_pages) | |
2040 | contig_pages = num_pages - i; | |
2041 | ||
2042 | /* for reads over a certain size could initiate async | |
2043 | read ahead */ | |
2044 | ||
2045 | read_size = contig_pages * PAGE_CACHE_SIZE; | |
2046 | /* Read size needs to be in multiples of one page */ | |
2047 | read_size = min_t(const unsigned int, read_size, | |
2048 | cifs_sb->rsize & PAGE_CACHE_MASK); | |
90c81e0b | 2049 | cFYI(DBG2, ("rpages: read size 0x%x contiguous pages %d", |
75865f8c | 2050 | read_size, contig_pages)); |
1da177e4 LT |
2051 | rc = -EAGAIN; |
2052 | while (rc == -EAGAIN) { | |
fb8c4b14 | 2053 | if ((open_file->invalidHandle) && |
1da177e4 | 2054 | (!open_file->closePend)) { |
4b18f2a9 | 2055 | rc = cifs_reopen_file(file, true); |
1da177e4 LT |
2056 | if (rc != 0) |
2057 | break; | |
2058 | } | |
2059 | ||
bfa0d75a | 2060 | rc = CIFSSMBRead(xid, pTcon, |
ec637e3f SF |
2061 | open_file->netfid, |
2062 | read_size, offset, | |
2063 | &bytes_read, &smb_read_data, | |
2064 | &buf_type); | |
a9d02ad4 | 2065 | /* BB more RC checks ? */ |
fb8c4b14 | 2066 | if (rc == -EAGAIN) { |
1da177e4 | 2067 | if (smb_read_data) { |
fb8c4b14 | 2068 | if (buf_type == CIFS_SMALL_BUFFER) |
ec637e3f | 2069 | cifs_small_buf_release(smb_read_data); |
fb8c4b14 | 2070 | else if (buf_type == CIFS_LARGE_BUFFER) |
ec637e3f | 2071 | cifs_buf_release(smb_read_data); |
1da177e4 LT |
2072 | smb_read_data = NULL; |
2073 | } | |
2074 | } | |
2075 | } | |
2076 | if ((rc < 0) || (smb_read_data == NULL)) { | |
2077 | cFYI(1, ("Read error in readpages: %d", rc)); | |
1da177e4 LT |
2078 | break; |
2079 | } else if (bytes_read > 0) { | |
6f88cc2e | 2080 | task_io_account_read(bytes_read); |
1da177e4 LT |
2081 | pSMBr = (struct smb_com_read_rsp *)smb_read_data; |
2082 | cifs_copy_cache_pages(mapping, page_list, bytes_read, | |
2083 | smb_read_data + 4 /* RFC1001 hdr */ + | |
2084 | le16_to_cpu(pSMBr->DataOffset), &lru_pvec); | |
2085 | ||
2086 | i += bytes_read >> PAGE_CACHE_SHIFT; | |
a4544347 | 2087 | cifs_stats_bytes_read(pTcon, bytes_read); |
2c2130e1 | 2088 | if ((bytes_read & PAGE_CACHE_MASK) != bytes_read) { |
1da177e4 LT |
2089 | i++; /* account for partial page */ |
2090 | ||
fb8c4b14 | 2091 | /* server copy of file can have smaller size |
1da177e4 | 2092 | than client */ |
fb8c4b14 SF |
2093 | /* BB do we need to verify this common case ? |
2094 | this case is ok - if we are at server EOF | |
1da177e4 LT |
2095 | we will hit it on next read */ |
2096 | ||
05ac9d4b | 2097 | /* break; */ |
1da177e4 LT |
2098 | } |
2099 | } else { | |
2100 | cFYI(1, ("No bytes read (%d) at offset %lld . " | |
2101 | "Cleaning remaining pages from readahead list", | |
2102 | bytes_read, offset)); | |
fb8c4b14 | 2103 | /* BB turn off caching and do new lookup on |
1da177e4 | 2104 | file size at server? */ |
1da177e4 LT |
2105 | break; |
2106 | } | |
2107 | if (smb_read_data) { | |
fb8c4b14 | 2108 | if (buf_type == CIFS_SMALL_BUFFER) |
ec637e3f | 2109 | cifs_small_buf_release(smb_read_data); |
fb8c4b14 | 2110 | else if (buf_type == CIFS_LARGE_BUFFER) |
ec637e3f | 2111 | cifs_buf_release(smb_read_data); |
1da177e4 LT |
2112 | smb_read_data = NULL; |
2113 | } | |
2114 | bytes_read = 0; | |
2115 | } | |
2116 | ||
4f98a2fe | 2117 | pagevec_lru_add_file(&lru_pvec); |
1da177e4 LT |
2118 | |
2119 | /* need to free smb_read_data buf before exit */ | |
2120 | if (smb_read_data) { | |
fb8c4b14 | 2121 | if (buf_type == CIFS_SMALL_BUFFER) |
47c886b3 | 2122 | cifs_small_buf_release(smb_read_data); |
fb8c4b14 | 2123 | else if (buf_type == CIFS_LARGE_BUFFER) |
47c886b3 | 2124 | cifs_buf_release(smb_read_data); |
1da177e4 | 2125 | smb_read_data = NULL; |
fb8c4b14 | 2126 | } |
1da177e4 LT |
2127 | |
2128 | FreeXid(xid); | |
2129 | return rc; | |
2130 | } | |
2131 | ||
2132 | static int cifs_readpage_worker(struct file *file, struct page *page, | |
2133 | loff_t *poffset) | |
2134 | { | |
2135 | char *read_data; | |
2136 | int rc; | |
2137 | ||
2138 | page_cache_get(page); | |
2139 | read_data = kmap(page); | |
2140 | /* for reads over a certain size could initiate async read ahead */ | |
fb8c4b14 | 2141 | |
1da177e4 | 2142 | rc = cifs_read(file, read_data, PAGE_CACHE_SIZE, poffset); |
fb8c4b14 | 2143 | |
1da177e4 LT |
2144 | if (rc < 0) |
2145 | goto io_error; | |
2146 | else | |
fb8c4b14 SF |
2147 | cFYI(1, ("Bytes read %d", rc)); |
2148 | ||
e6a00296 JJS |
2149 | file->f_path.dentry->d_inode->i_atime = |
2150 | current_fs_time(file->f_path.dentry->d_inode->i_sb); | |
fb8c4b14 | 2151 | |
1da177e4 LT |
2152 | if (PAGE_CACHE_SIZE > rc) |
2153 | memset(read_data + rc, 0, PAGE_CACHE_SIZE - rc); | |
2154 | ||
2155 | flush_dcache_page(page); | |
2156 | SetPageUptodate(page); | |
2157 | rc = 0; | |
fb8c4b14 | 2158 | |
1da177e4 | 2159 | io_error: |
fb8c4b14 | 2160 | kunmap(page); |
1da177e4 LT |
2161 | page_cache_release(page); |
2162 | return rc; | |
2163 | } | |
2164 | ||
2165 | static int cifs_readpage(struct file *file, struct page *page) | |
2166 | { | |
2167 | loff_t offset = (loff_t)page->index << PAGE_CACHE_SHIFT; | |
2168 | int rc = -EACCES; | |
2169 | int xid; | |
2170 | ||
2171 | xid = GetXid(); | |
2172 | ||
2173 | if (file->private_data == NULL) { | |
0f3bc09e | 2174 | rc = -EBADF; |
1da177e4 | 2175 | FreeXid(xid); |
0f3bc09e | 2176 | return rc; |
1da177e4 LT |
2177 | } |
2178 | ||
fb8c4b14 | 2179 | cFYI(1, ("readpage %p at offset %d 0x%x\n", |
1da177e4 LT |
2180 | page, (int)offset, (int)offset)); |
2181 | ||
2182 | rc = cifs_readpage_worker(file, page, &offset); | |
2183 | ||
2184 | unlock_page(page); | |
2185 | ||
2186 | FreeXid(xid); | |
2187 | return rc; | |
2188 | } | |
2189 | ||
a403a0a3 SF |
2190 | static int is_inode_writable(struct cifsInodeInfo *cifs_inode) |
2191 | { | |
2192 | struct cifsFileInfo *open_file; | |
2193 | ||
2194 | read_lock(&GlobalSMBSeslock); | |
2195 | list_for_each_entry(open_file, &cifs_inode->openFileList, flist) { | |
2196 | if (open_file->closePend) | |
2197 | continue; | |
2198 | if (open_file->pfile && | |
2199 | ((open_file->pfile->f_flags & O_RDWR) || | |
2200 | (open_file->pfile->f_flags & O_WRONLY))) { | |
2201 | read_unlock(&GlobalSMBSeslock); | |
2202 | return 1; | |
2203 | } | |
2204 | } | |
2205 | read_unlock(&GlobalSMBSeslock); | |
2206 | return 0; | |
2207 | } | |
2208 | ||
1da177e4 LT |
2209 | /* We do not want to update the file size from server for inodes |
2210 | open for write - to avoid races with writepage extending | |
2211 | the file - in the future we could consider allowing | |
fb8c4b14 | 2212 | refreshing the inode only on increases in the file size |
1da177e4 LT |
2213 | but this is tricky to do without racing with writebehind |
2214 | page caching in the current Linux kernel design */ | |
4b18f2a9 | 2215 | bool is_size_safe_to_change(struct cifsInodeInfo *cifsInode, __u64 end_of_file) |
1da177e4 | 2216 | { |
a403a0a3 | 2217 | if (!cifsInode) |
4b18f2a9 | 2218 | return true; |
50c2f753 | 2219 | |
a403a0a3 SF |
2220 | if (is_inode_writable(cifsInode)) { |
2221 | /* This inode is open for write at least once */ | |
c32a0b68 SF |
2222 | struct cifs_sb_info *cifs_sb; |
2223 | ||
c32a0b68 | 2224 | cifs_sb = CIFS_SB(cifsInode->vfs_inode.i_sb); |
ad7a2926 | 2225 | if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DIRECT_IO) { |
fb8c4b14 | 2226 | /* since no page cache to corrupt on directio |
c32a0b68 | 2227 | we can change size safely */ |
4b18f2a9 | 2228 | return true; |
c32a0b68 SF |
2229 | } |
2230 | ||
fb8c4b14 | 2231 | if (i_size_read(&cifsInode->vfs_inode) < end_of_file) |
4b18f2a9 | 2232 | return true; |
7ba52631 | 2233 | |
4b18f2a9 | 2234 | return false; |
23e7dd7d | 2235 | } else |
4b18f2a9 | 2236 | return true; |
1da177e4 LT |
2237 | } |
2238 | ||
d9414774 NP |
2239 | static int cifs_write_begin(struct file *file, struct address_space *mapping, |
2240 | loff_t pos, unsigned len, unsigned flags, | |
2241 | struct page **pagep, void **fsdata) | |
1da177e4 | 2242 | { |
d9414774 NP |
2243 | pgoff_t index = pos >> PAGE_CACHE_SHIFT; |
2244 | loff_t offset = pos & (PAGE_CACHE_SIZE - 1); | |
a98ee8c1 JL |
2245 | loff_t page_start = pos & PAGE_MASK; |
2246 | loff_t i_size; | |
2247 | struct page *page; | |
2248 | int rc = 0; | |
d9414774 NP |
2249 | |
2250 | cFYI(1, ("write_begin from %lld len %d", (long long)pos, len)); | |
2251 | ||
54566b2c | 2252 | page = grab_cache_page_write_begin(mapping, index, flags); |
a98ee8c1 JL |
2253 | if (!page) { |
2254 | rc = -ENOMEM; | |
2255 | goto out; | |
2256 | } | |
8a236264 | 2257 | |
a98ee8c1 JL |
2258 | if (PageUptodate(page)) |
2259 | goto out; | |
8a236264 | 2260 | |
a98ee8c1 JL |
2261 | /* |
2262 | * If we write a full page it will be up to date, no need to read from | |
2263 | * the server. If the write is short, we'll end up doing a sync write | |
2264 | * instead. | |
2265 | */ | |
2266 | if (len == PAGE_CACHE_SIZE) | |
2267 | goto out; | |
8a236264 | 2268 | |
a98ee8c1 JL |
2269 | /* |
2270 | * optimize away the read when we have an oplock, and we're not | |
2271 | * expecting to use any of the data we'd be reading in. That | |
2272 | * is, when the page lies beyond the EOF, or straddles the EOF | |
2273 | * and the write will cover all of the existing data. | |
2274 | */ | |
2275 | if (CIFS_I(mapping->host)->clientCanCacheRead) { | |
2276 | i_size = i_size_read(mapping->host); | |
2277 | if (page_start >= i_size || | |
2278 | (offset == 0 && (pos + len) >= i_size)) { | |
2279 | zero_user_segments(page, 0, offset, | |
2280 | offset + len, | |
2281 | PAGE_CACHE_SIZE); | |
2282 | /* | |
2283 | * PageChecked means that the parts of the page | |
2284 | * to which we're not writing are considered up | |
2285 | * to date. Once the data is copied to the | |
2286 | * page, it can be set uptodate. | |
2287 | */ | |
2288 | SetPageChecked(page); | |
2289 | goto out; | |
2290 | } | |
2291 | } | |
d9414774 | 2292 | |
a98ee8c1 JL |
2293 | if ((file->f_flags & O_ACCMODE) != O_WRONLY) { |
2294 | /* | |
2295 | * might as well read a page, it is fast enough. If we get | |
2296 | * an error, we don't need to return it. cifs_write_end will | |
2297 | * do a sync write instead since PG_uptodate isn't set. | |
2298 | */ | |
2299 | cifs_readpage_worker(file, page, &page_start); | |
8a236264 SF |
2300 | } else { |
2301 | /* we could try using another file handle if there is one - | |
2302 | but how would we lock it to prevent close of that handle | |
2303 | racing with this read? In any case | |
d9414774 | 2304 | this will be written out by write_end so is fine */ |
1da177e4 | 2305 | } |
a98ee8c1 JL |
2306 | out: |
2307 | *pagep = page; | |
2308 | return rc; | |
1da177e4 LT |
2309 | } |
2310 | ||
f5e54d6e | 2311 | const struct address_space_operations cifs_addr_ops = { |
1da177e4 LT |
2312 | .readpage = cifs_readpage, |
2313 | .readpages = cifs_readpages, | |
2314 | .writepage = cifs_writepage, | |
37c0eb46 | 2315 | .writepages = cifs_writepages, |
d9414774 NP |
2316 | .write_begin = cifs_write_begin, |
2317 | .write_end = cifs_write_end, | |
1da177e4 LT |
2318 | .set_page_dirty = __set_page_dirty_nobuffers, |
2319 | /* .sync_page = cifs_sync_page, */ | |
2320 | /* .direct_IO = */ | |
2321 | }; | |
273d81d6 DK |
2322 | |
2323 | /* | |
2324 | * cifs_readpages requires the server to support a buffer large enough to | |
2325 | * contain the header plus one complete page of data. Otherwise, we need | |
2326 | * to leave cifs_readpages out of the address space operations. | |
2327 | */ | |
f5e54d6e | 2328 | const struct address_space_operations cifs_addr_ops_smallbuf = { |
273d81d6 DK |
2329 | .readpage = cifs_readpage, |
2330 | .writepage = cifs_writepage, | |
2331 | .writepages = cifs_writepages, | |
d9414774 NP |
2332 | .write_begin = cifs_write_begin, |
2333 | .write_end = cifs_write_end, | |
273d81d6 DK |
2334 | .set_page_dirty = __set_page_dirty_nobuffers, |
2335 | /* .sync_page = cifs_sync_page, */ | |
2336 | /* .direct_IO = */ | |
2337 | }; |