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Commit | Line | Data |
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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; | |
23e7dd7d SF |
56 | /* we have to track num writers to the inode, since writepages |
57 | does not tell us which handle the write is for so there can | |
58 | be a close (overlapping with write) of the filehandle that | |
59 | cifs_writepages chose to use */ | |
fb8c4b14 | 60 | atomic_set(&private_data->wrtPending, 0); |
1da177e4 LT |
61 | |
62 | return private_data; | |
63 | } | |
64 | ||
65 | static inline int cifs_convert_flags(unsigned int flags) | |
66 | { | |
67 | if ((flags & O_ACCMODE) == O_RDONLY) | |
68 | return GENERIC_READ; | |
69 | else if ((flags & O_ACCMODE) == O_WRONLY) | |
70 | return GENERIC_WRITE; | |
71 | else if ((flags & O_ACCMODE) == O_RDWR) { | |
72 | /* GENERIC_ALL is too much permission to request | |
73 | can cause unnecessary access denied on create */ | |
74 | /* return GENERIC_ALL; */ | |
75 | return (GENERIC_READ | GENERIC_WRITE); | |
76 | } | |
77 | ||
e10f7b55 JL |
78 | return (READ_CONTROL | FILE_WRITE_ATTRIBUTES | FILE_READ_ATTRIBUTES | |
79 | FILE_WRITE_EA | FILE_APPEND_DATA | FILE_WRITE_DATA | | |
80 | FILE_READ_DATA); | |
7fc8f4e9 | 81 | } |
e10f7b55 | 82 | |
7fc8f4e9 SF |
83 | static inline fmode_t cifs_posix_convert_flags(unsigned int flags) |
84 | { | |
85 | fmode_t posix_flags = 0; | |
e10f7b55 | 86 | |
7fc8f4e9 SF |
87 | if ((flags & O_ACCMODE) == O_RDONLY) |
88 | posix_flags = FMODE_READ; | |
89 | else if ((flags & O_ACCMODE) == O_WRONLY) | |
90 | posix_flags = FMODE_WRITE; | |
91 | else if ((flags & O_ACCMODE) == O_RDWR) { | |
92 | /* GENERIC_ALL is too much permission to request | |
93 | can cause unnecessary access denied on create */ | |
94 | /* return GENERIC_ALL; */ | |
95 | posix_flags = FMODE_READ | FMODE_WRITE; | |
96 | } | |
97 | /* can not map O_CREAT or O_EXCL or O_TRUNC flags when | |
98 | reopening a file. They had their effect on the original open */ | |
99 | if (flags & O_APPEND) | |
100 | posix_flags |= (fmode_t)O_APPEND; | |
101 | if (flags & O_SYNC) | |
102 | posix_flags |= (fmode_t)O_SYNC; | |
103 | if (flags & O_DIRECTORY) | |
104 | posix_flags |= (fmode_t)O_DIRECTORY; | |
105 | if (flags & O_NOFOLLOW) | |
106 | posix_flags |= (fmode_t)O_NOFOLLOW; | |
107 | if (flags & O_DIRECT) | |
108 | posix_flags |= (fmode_t)O_DIRECT; | |
109 | ||
110 | return posix_flags; | |
1da177e4 LT |
111 | } |
112 | ||
113 | static inline int cifs_get_disposition(unsigned int flags) | |
114 | { | |
115 | if ((flags & (O_CREAT | O_EXCL)) == (O_CREAT | O_EXCL)) | |
116 | return FILE_CREATE; | |
117 | else if ((flags & (O_CREAT | O_TRUNC)) == (O_CREAT | O_TRUNC)) | |
118 | return FILE_OVERWRITE_IF; | |
119 | else if ((flags & O_CREAT) == O_CREAT) | |
120 | return FILE_OPEN_IF; | |
55aa2e09 SF |
121 | else if ((flags & O_TRUNC) == O_TRUNC) |
122 | return FILE_OVERWRITE; | |
1da177e4 LT |
123 | else |
124 | return FILE_OPEN; | |
125 | } | |
126 | ||
276a74a4 SF |
127 | /* all arguments to this function must be checked for validity in caller */ |
128 | static inline int cifs_posix_open_inode_helper(struct inode *inode, | |
129 | struct file *file, struct cifsInodeInfo *pCifsInode, | |
130 | struct cifsFileInfo *pCifsFile, int oplock, u16 netfid) | |
131 | { | |
276a74a4 | 132 | |
276a74a4 | 133 | write_lock(&GlobalSMBSeslock); |
276a74a4 SF |
134 | |
135 | pCifsInode = CIFS_I(file->f_path.dentry->d_inode); | |
136 | if (pCifsInode == NULL) { | |
137 | write_unlock(&GlobalSMBSeslock); | |
138 | return -EINVAL; | |
139 | } | |
140 | ||
276a74a4 SF |
141 | if (pCifsInode->clientCanCacheRead) { |
142 | /* we have the inode open somewhere else | |
143 | no need to discard cache data */ | |
144 | goto psx_client_can_cache; | |
145 | } | |
146 | ||
147 | /* BB FIXME need to fix this check to move it earlier into posix_open | |
148 | BB fIX following section BB FIXME */ | |
149 | ||
150 | /* if not oplocked, invalidate inode pages if mtime or file | |
151 | size changed */ | |
152 | /* temp = cifs_NTtimeToUnix(le64_to_cpu(buf->LastWriteTime)); | |
153 | if (timespec_equal(&file->f_path.dentry->d_inode->i_mtime, &temp) && | |
154 | (file->f_path.dentry->d_inode->i_size == | |
155 | (loff_t)le64_to_cpu(buf->EndOfFile))) { | |
156 | cFYI(1, ("inode unchanged on server")); | |
157 | } else { | |
158 | if (file->f_path.dentry->d_inode->i_mapping) { | |
159 | rc = filemap_write_and_wait(file->f_path.dentry->d_inode->i_mapping); | |
160 | if (rc != 0) | |
161 | CIFS_I(file->f_path.dentry->d_inode)->write_behind_rc = rc; | |
162 | } | |
163 | cFYI(1, ("invalidating remote inode since open detected it " | |
164 | "changed")); | |
165 | invalidate_remote_inode(file->f_path.dentry->d_inode); | |
166 | } */ | |
167 | ||
168 | psx_client_can_cache: | |
169 | if ((oplock & 0xF) == OPLOCK_EXCLUSIVE) { | |
170 | pCifsInode->clientCanCacheAll = true; | |
171 | pCifsInode->clientCanCacheRead = true; | |
172 | cFYI(1, ("Exclusive Oplock granted on inode %p", | |
173 | file->f_path.dentry->d_inode)); | |
174 | } else if ((oplock & 0xF) == OPLOCK_READ) | |
175 | pCifsInode->clientCanCacheRead = true; | |
176 | ||
177 | /* will have to change the unlock if we reenable the | |
178 | filemap_fdatawrite (which does not seem necessary */ | |
179 | write_unlock(&GlobalSMBSeslock); | |
180 | return 0; | |
181 | } | |
182 | ||
703a3b8e SF |
183 | static struct cifsFileInfo * |
184 | cifs_fill_filedata(struct file *file) | |
185 | { | |
186 | struct list_head *tmp; | |
187 | struct cifsFileInfo *pCifsFile = NULL; | |
188 | struct cifsInodeInfo *pCifsInode = NULL; | |
189 | ||
190 | /* search inode for this file and fill in file->private_data */ | |
191 | pCifsInode = CIFS_I(file->f_path.dentry->d_inode); | |
192 | read_lock(&GlobalSMBSeslock); | |
193 | list_for_each(tmp, &pCifsInode->openFileList) { | |
194 | pCifsFile = list_entry(tmp, struct cifsFileInfo, flist); | |
195 | if ((pCifsFile->pfile == NULL) && | |
196 | (pCifsFile->pid == current->tgid)) { | |
197 | /* mode set in cifs_create */ | |
198 | ||
199 | /* needed for writepage */ | |
200 | pCifsFile->pfile = file; | |
201 | file->private_data = pCifsFile; | |
202 | break; | |
203 | } | |
204 | } | |
205 | read_unlock(&GlobalSMBSeslock); | |
206 | ||
207 | if (file->private_data != NULL) { | |
208 | return pCifsFile; | |
209 | } else if ((file->f_flags & O_CREAT) && (file->f_flags & O_EXCL)) | |
210 | cERROR(1, ("could not find file instance for " | |
211 | "new file %p", file)); | |
212 | return NULL; | |
213 | } | |
214 | ||
1da177e4 LT |
215 | /* all arguments to this function must be checked for validity in caller */ |
216 | static inline int cifs_open_inode_helper(struct inode *inode, struct file *file, | |
217 | struct cifsInodeInfo *pCifsInode, struct cifsFileInfo *pCifsFile, | |
218 | struct cifsTconInfo *pTcon, int *oplock, FILE_ALL_INFO *buf, | |
219 | char *full_path, int xid) | |
220 | { | |
221 | struct timespec temp; | |
222 | int rc; | |
223 | ||
224 | /* want handles we can use to read with first | |
225 | in the list so we do not have to walk the | |
d9414774 | 226 | list to search for one in write_begin */ |
1da177e4 | 227 | if ((file->f_flags & O_ACCMODE) == O_WRONLY) { |
fb8c4b14 | 228 | list_add_tail(&pCifsFile->flist, |
1da177e4 LT |
229 | &pCifsInode->openFileList); |
230 | } else { | |
231 | list_add(&pCifsFile->flist, | |
232 | &pCifsInode->openFileList); | |
233 | } | |
234 | write_unlock(&GlobalSMBSeslock); | |
1da177e4 LT |
235 | if (pCifsInode->clientCanCacheRead) { |
236 | /* we have the inode open somewhere else | |
237 | no need to discard cache data */ | |
238 | goto client_can_cache; | |
239 | } | |
240 | ||
241 | /* BB need same check in cifs_create too? */ | |
242 | /* if not oplocked, invalidate inode pages if mtime or file | |
243 | size changed */ | |
07119a4d | 244 | temp = cifs_NTtimeToUnix(buf->LastWriteTime); |
e6a00296 JJS |
245 | if (timespec_equal(&file->f_path.dentry->d_inode->i_mtime, &temp) && |
246 | (file->f_path.dentry->d_inode->i_size == | |
1da177e4 LT |
247 | (loff_t)le64_to_cpu(buf->EndOfFile))) { |
248 | cFYI(1, ("inode unchanged on server")); | |
249 | } else { | |
e6a00296 | 250 | if (file->f_path.dentry->d_inode->i_mapping) { |
1da177e4 LT |
251 | /* BB no need to lock inode until after invalidate |
252 | since namei code should already have it locked? */ | |
cea21805 JL |
253 | rc = filemap_write_and_wait(file->f_path.dentry->d_inode->i_mapping); |
254 | if (rc != 0) | |
255 | CIFS_I(file->f_path.dentry->d_inode)->write_behind_rc = rc; | |
1da177e4 LT |
256 | } |
257 | cFYI(1, ("invalidating remote inode since open detected it " | |
258 | "changed")); | |
e6a00296 | 259 | invalidate_remote_inode(file->f_path.dentry->d_inode); |
1da177e4 LT |
260 | } |
261 | ||
262 | client_can_cache: | |
c18c842b | 263 | if (pTcon->unix_ext) |
e6a00296 | 264 | rc = cifs_get_inode_info_unix(&file->f_path.dentry->d_inode, |
1da177e4 LT |
265 | full_path, inode->i_sb, xid); |
266 | else | |
e6a00296 | 267 | rc = cifs_get_inode_info(&file->f_path.dentry->d_inode, |
8b1327f6 | 268 | full_path, buf, inode->i_sb, xid, NULL); |
1da177e4 LT |
269 | |
270 | if ((*oplock & 0xF) == OPLOCK_EXCLUSIVE) { | |
4b18f2a9 SF |
271 | pCifsInode->clientCanCacheAll = true; |
272 | pCifsInode->clientCanCacheRead = true; | |
1da177e4 | 273 | cFYI(1, ("Exclusive Oplock granted on inode %p", |
e6a00296 | 274 | file->f_path.dentry->d_inode)); |
1da177e4 | 275 | } else if ((*oplock & 0xF) == OPLOCK_READ) |
4b18f2a9 | 276 | pCifsInode->clientCanCacheRead = true; |
1da177e4 LT |
277 | |
278 | return rc; | |
279 | } | |
280 | ||
281 | int cifs_open(struct inode *inode, struct file *file) | |
282 | { | |
283 | int rc = -EACCES; | |
284 | int xid, oplock; | |
285 | struct cifs_sb_info *cifs_sb; | |
276a74a4 | 286 | struct cifsTconInfo *tcon; |
1da177e4 LT |
287 | struct cifsFileInfo *pCifsFile; |
288 | struct cifsInodeInfo *pCifsInode; | |
1da177e4 LT |
289 | char *full_path = NULL; |
290 | int desiredAccess; | |
291 | int disposition; | |
292 | __u16 netfid; | |
293 | FILE_ALL_INFO *buf = NULL; | |
294 | ||
295 | xid = GetXid(); | |
296 | ||
297 | cifs_sb = CIFS_SB(inode->i_sb); | |
276a74a4 | 298 | tcon = cifs_sb->tcon; |
1da177e4 | 299 | |
a6ce4932 | 300 | pCifsInode = CIFS_I(file->f_path.dentry->d_inode); |
703a3b8e SF |
301 | pCifsFile = cifs_fill_filedata(file); |
302 | if (pCifsFile) { | |
0f3bc09e | 303 | rc = 0; |
a6ce4932 | 304 | FreeXid(xid); |
0f3bc09e | 305 | return rc; |
703a3b8e | 306 | } |
1da177e4 | 307 | |
e6a00296 | 308 | full_path = build_path_from_dentry(file->f_path.dentry); |
1da177e4 | 309 | if (full_path == NULL) { |
0f3bc09e | 310 | rc = -ENOMEM; |
1da177e4 | 311 | FreeXid(xid); |
0f3bc09e | 312 | return rc; |
1da177e4 LT |
313 | } |
314 | ||
7521a3c5 | 315 | cFYI(1, ("inode = 0x%p file flags are 0x%x for %s", |
1da177e4 | 316 | inode, file->f_flags, full_path)); |
276a74a4 SF |
317 | |
318 | if (oplockEnabled) | |
319 | oplock = REQ_OPLOCK; | |
320 | else | |
321 | oplock = 0; | |
322 | ||
64cc2c63 SF |
323 | if (!tcon->broken_posix_open && tcon->unix_ext && |
324 | (tcon->ses->capabilities & CAP_UNIX) && | |
276a74a4 SF |
325 | (CIFS_UNIX_POSIX_PATH_OPS_CAP & |
326 | le64_to_cpu(tcon->fsUnixInfo.Capability))) { | |
327 | int oflags = (int) cifs_posix_convert_flags(file->f_flags); | |
328 | /* can not refresh inode info since size could be stale */ | |
329 | rc = cifs_posix_open(full_path, &inode, inode->i_sb, | |
330 | cifs_sb->mnt_file_mode /* ignored */, | |
331 | oflags, &oplock, &netfid, xid); | |
332 | if (rc == 0) { | |
333 | cFYI(1, ("posix open succeeded")); | |
334 | /* no need for special case handling of setting mode | |
335 | on read only files needed here */ | |
336 | ||
703a3b8e | 337 | pCifsFile = cifs_fill_filedata(file); |
276a74a4 SF |
338 | cifs_posix_open_inode_helper(inode, file, pCifsInode, |
339 | pCifsFile, oplock, netfid); | |
340 | goto out; | |
64cc2c63 SF |
341 | } else if ((rc == -EINVAL) || (rc == -EOPNOTSUPP)) { |
342 | if (tcon->ses->serverNOS) | |
343 | cERROR(1, ("server %s of type %s returned" | |
344 | " unexpected error on SMB posix open" | |
345 | ", disabling posix open support." | |
346 | " Check if server update available.", | |
347 | tcon->ses->serverName, | |
348 | tcon->ses->serverNOS)); | |
349 | tcon->broken_posix_open = true; | |
276a74a4 SF |
350 | } else if ((rc != -EIO) && (rc != -EREMOTE) && |
351 | (rc != -EOPNOTSUPP)) /* path not found or net err */ | |
352 | goto out; | |
64cc2c63 SF |
353 | /* else fallthrough to retry open the old way on network i/o |
354 | or DFS errors */ | |
276a74a4 SF |
355 | } |
356 | ||
1da177e4 LT |
357 | desiredAccess = cifs_convert_flags(file->f_flags); |
358 | ||
359 | /********************************************************************* | |
360 | * open flag mapping table: | |
fb8c4b14 | 361 | * |
1da177e4 | 362 | * POSIX Flag CIFS Disposition |
fb8c4b14 | 363 | * ---------- ---------------- |
1da177e4 LT |
364 | * O_CREAT FILE_OPEN_IF |
365 | * O_CREAT | O_EXCL FILE_CREATE | |
366 | * O_CREAT | O_TRUNC FILE_OVERWRITE_IF | |
367 | * O_TRUNC FILE_OVERWRITE | |
368 | * none of the above FILE_OPEN | |
369 | * | |
370 | * Note that there is not a direct match between disposition | |
fb8c4b14 | 371 | * FILE_SUPERSEDE (ie create whether or not file exists although |
1da177e4 LT |
372 | * O_CREAT | O_TRUNC is similar but truncates the existing |
373 | * file rather than creating a new file as FILE_SUPERSEDE does | |
374 | * (which uses the attributes / metadata passed in on open call) | |
375 | *? | |
fb8c4b14 | 376 | *? O_SYNC is a reasonable match to CIFS writethrough flag |
1da177e4 LT |
377 | *? and the read write flags match reasonably. O_LARGEFILE |
378 | *? is irrelevant because largefile support is always used | |
379 | *? by this client. Flags O_APPEND, O_DIRECT, O_DIRECTORY, | |
380 | * O_FASYNC, O_NOFOLLOW, O_NONBLOCK need further investigation | |
381 | *********************************************************************/ | |
382 | ||
383 | disposition = cifs_get_disposition(file->f_flags); | |
384 | ||
1da177e4 LT |
385 | /* BB pass O_SYNC flag through on file attributes .. BB */ |
386 | ||
387 | /* Also refresh inode by passing in file_info buf returned by SMBOpen | |
388 | and calling get_inode_info with returned buf (at least helps | |
389 | non-Unix server case) */ | |
390 | ||
fb8c4b14 SF |
391 | /* BB we can not do this if this is the second open of a file |
392 | and the first handle has writebehind data, we might be | |
1da177e4 LT |
393 | able to simply do a filemap_fdatawrite/filemap_fdatawait first */ |
394 | buf = kmalloc(sizeof(FILE_ALL_INFO), GFP_KERNEL); | |
395 | if (!buf) { | |
396 | rc = -ENOMEM; | |
397 | goto out; | |
398 | } | |
5bafd765 SF |
399 | |
400 | if (cifs_sb->tcon->ses->capabilities & CAP_NT_SMBS) | |
276a74a4 | 401 | rc = CIFSSMBOpen(xid, tcon, full_path, disposition, |
5bafd765 | 402 | desiredAccess, CREATE_NOT_DIR, &netfid, &oplock, buf, |
737b758c SF |
403 | cifs_sb->local_nls, cifs_sb->mnt_cifs_flags |
404 | & CIFS_MOUNT_MAP_SPECIAL_CHR); | |
5bafd765 SF |
405 | else |
406 | rc = -EIO; /* no NT SMB support fall into legacy open below */ | |
407 | ||
a9d02ad4 SF |
408 | if (rc == -EIO) { |
409 | /* Old server, try legacy style OpenX */ | |
276a74a4 | 410 | rc = SMBLegacyOpen(xid, tcon, full_path, disposition, |
a9d02ad4 SF |
411 | desiredAccess, CREATE_NOT_DIR, &netfid, &oplock, buf, |
412 | cifs_sb->local_nls, cifs_sb->mnt_cifs_flags | |
413 | & CIFS_MOUNT_MAP_SPECIAL_CHR); | |
414 | } | |
1da177e4 | 415 | if (rc) { |
26a21b98 | 416 | cFYI(1, ("cifs_open returned 0x%x", rc)); |
1da177e4 LT |
417 | goto out; |
418 | } | |
419 | file->private_data = | |
420 | kmalloc(sizeof(struct cifsFileInfo), GFP_KERNEL); | |
421 | if (file->private_data == NULL) { | |
422 | rc = -ENOMEM; | |
423 | goto out; | |
424 | } | |
425 | pCifsFile = cifs_init_private(file->private_data, inode, file, netfid); | |
1da177e4 | 426 | write_lock(&GlobalSMBSeslock); |
276a74a4 | 427 | list_add(&pCifsFile->tlist, &tcon->openFileList); |
1da177e4 | 428 | |
e6a00296 | 429 | pCifsInode = CIFS_I(file->f_path.dentry->d_inode); |
1da177e4 LT |
430 | if (pCifsInode) { |
431 | rc = cifs_open_inode_helper(inode, file, pCifsInode, | |
276a74a4 | 432 | pCifsFile, tcon, |
1da177e4 LT |
433 | &oplock, buf, full_path, xid); |
434 | } else { | |
435 | write_unlock(&GlobalSMBSeslock); | |
1da177e4 LT |
436 | } |
437 | ||
fb8c4b14 | 438 | if (oplock & CIFS_CREATE_ACTION) { |
1da177e4 LT |
439 | /* time to set mode which we can not set earlier due to |
440 | problems creating new read-only files */ | |
276a74a4 | 441 | if (tcon->unix_ext) { |
4e1e7fb9 JL |
442 | struct cifs_unix_set_info_args args = { |
443 | .mode = inode->i_mode, | |
444 | .uid = NO_CHANGE_64, | |
445 | .gid = NO_CHANGE_64, | |
446 | .ctime = NO_CHANGE_64, | |
447 | .atime = NO_CHANGE_64, | |
448 | .mtime = NO_CHANGE_64, | |
449 | .device = 0, | |
450 | }; | |
01ea95e3 JL |
451 | CIFSSMBUnixSetPathInfo(xid, tcon, full_path, &args, |
452 | cifs_sb->local_nls, | |
453 | cifs_sb->mnt_cifs_flags & | |
737b758c | 454 | CIFS_MOUNT_MAP_SPECIAL_CHR); |
1da177e4 LT |
455 | } |
456 | } | |
457 | ||
458 | out: | |
459 | kfree(buf); | |
460 | kfree(full_path); | |
461 | FreeXid(xid); | |
462 | return rc; | |
463 | } | |
464 | ||
0418726b | 465 | /* Try to reacquire byte range locks that were released when session */ |
1da177e4 LT |
466 | /* to server was lost */ |
467 | static int cifs_relock_file(struct cifsFileInfo *cifsFile) | |
468 | { | |
469 | int rc = 0; | |
470 | ||
471 | /* BB list all locks open on this file and relock */ | |
472 | ||
473 | return rc; | |
474 | } | |
475 | ||
4b18f2a9 | 476 | static int cifs_reopen_file(struct file *file, bool can_flush) |
1da177e4 LT |
477 | { |
478 | int rc = -EACCES; | |
479 | int xid, oplock; | |
480 | struct cifs_sb_info *cifs_sb; | |
7fc8f4e9 | 481 | struct cifsTconInfo *tcon; |
1da177e4 LT |
482 | struct cifsFileInfo *pCifsFile; |
483 | struct cifsInodeInfo *pCifsInode; | |
fb8c4b14 | 484 | struct inode *inode; |
1da177e4 LT |
485 | char *full_path = NULL; |
486 | int desiredAccess; | |
487 | int disposition = FILE_OPEN; | |
488 | __u16 netfid; | |
489 | ||
ad7a2926 | 490 | if (file->private_data) |
1da177e4 | 491 | pCifsFile = (struct cifsFileInfo *)file->private_data; |
ad7a2926 | 492 | else |
1da177e4 LT |
493 | return -EBADF; |
494 | ||
495 | xid = GetXid(); | |
f0a71eb8 | 496 | mutex_lock(&pCifsFile->fh_mutex); |
4b18f2a9 | 497 | if (!pCifsFile->invalidHandle) { |
f0a71eb8 | 498 | mutex_unlock(&pCifsFile->fh_mutex); |
0f3bc09e | 499 | rc = 0; |
1da177e4 | 500 | FreeXid(xid); |
0f3bc09e | 501 | return rc; |
1da177e4 LT |
502 | } |
503 | ||
e6a00296 | 504 | if (file->f_path.dentry == NULL) { |
3a9f462f SF |
505 | cERROR(1, ("no valid name if dentry freed")); |
506 | dump_stack(); | |
507 | rc = -EBADF; | |
508 | goto reopen_error_exit; | |
509 | } | |
510 | ||
511 | inode = file->f_path.dentry->d_inode; | |
fb8c4b14 | 512 | if (inode == NULL) { |
3a9f462f SF |
513 | cERROR(1, ("inode not valid")); |
514 | dump_stack(); | |
515 | rc = -EBADF; | |
516 | goto reopen_error_exit; | |
1da177e4 | 517 | } |
50c2f753 | 518 | |
1da177e4 | 519 | cifs_sb = CIFS_SB(inode->i_sb); |
7fc8f4e9 | 520 | tcon = cifs_sb->tcon; |
3a9f462f | 521 | |
1da177e4 LT |
522 | /* can not grab rename sem here because various ops, including |
523 | those that already have the rename sem can end up causing writepage | |
524 | to get called and if the server was down that means we end up here, | |
525 | and we can never tell if the caller already has the rename_sem */ | |
e6a00296 | 526 | full_path = build_path_from_dentry(file->f_path.dentry); |
1da177e4 | 527 | if (full_path == NULL) { |
3a9f462f SF |
528 | rc = -ENOMEM; |
529 | reopen_error_exit: | |
f0a71eb8 | 530 | mutex_unlock(&pCifsFile->fh_mutex); |
1da177e4 | 531 | FreeXid(xid); |
3a9f462f | 532 | return rc; |
1da177e4 LT |
533 | } |
534 | ||
3a9f462f | 535 | cFYI(1, ("inode = 0x%p file flags 0x%x for %s", |
fb8c4b14 | 536 | inode, file->f_flags, full_path)); |
1da177e4 LT |
537 | |
538 | if (oplockEnabled) | |
539 | oplock = REQ_OPLOCK; | |
540 | else | |
4b18f2a9 | 541 | oplock = 0; |
1da177e4 | 542 | |
7fc8f4e9 SF |
543 | if (tcon->unix_ext && (tcon->ses->capabilities & CAP_UNIX) && |
544 | (CIFS_UNIX_POSIX_PATH_OPS_CAP & | |
545 | le64_to_cpu(tcon->fsUnixInfo.Capability))) { | |
546 | int oflags = (int) cifs_posix_convert_flags(file->f_flags); | |
547 | /* can not refresh inode info since size could be stale */ | |
548 | rc = cifs_posix_open(full_path, NULL, inode->i_sb, | |
549 | cifs_sb->mnt_file_mode /* ignored */, | |
550 | oflags, &oplock, &netfid, xid); | |
551 | if (rc == 0) { | |
552 | cFYI(1, ("posix reopen succeeded")); | |
553 | goto reopen_success; | |
554 | } | |
555 | /* fallthrough to retry open the old way on errors, especially | |
556 | in the reconnect path it is important to retry hard */ | |
557 | } | |
558 | ||
559 | desiredAccess = cifs_convert_flags(file->f_flags); | |
560 | ||
1da177e4 | 561 | /* Can not refresh inode by passing in file_info buf to be returned |
fb8c4b14 SF |
562 | by SMBOpen and then calling get_inode_info with returned buf |
563 | since file might have write behind data that needs to be flushed | |
1da177e4 LT |
564 | and server version of file size can be stale. If we knew for sure |
565 | that inode was not dirty locally we could do this */ | |
566 | ||
7fc8f4e9 | 567 | rc = CIFSSMBOpen(xid, tcon, full_path, disposition, desiredAccess, |
1da177e4 | 568 | CREATE_NOT_DIR, &netfid, &oplock, NULL, |
fb8c4b14 | 569 | cifs_sb->local_nls, cifs_sb->mnt_cifs_flags & |
737b758c | 570 | CIFS_MOUNT_MAP_SPECIAL_CHR); |
1da177e4 | 571 | if (rc) { |
f0a71eb8 | 572 | mutex_unlock(&pCifsFile->fh_mutex); |
26a21b98 SF |
573 | cFYI(1, ("cifs_open returned 0x%x", rc)); |
574 | cFYI(1, ("oplock: %d", oplock)); | |
1da177e4 | 575 | } else { |
7fc8f4e9 | 576 | reopen_success: |
1da177e4 | 577 | pCifsFile->netfid = netfid; |
4b18f2a9 | 578 | pCifsFile->invalidHandle = false; |
f0a71eb8 | 579 | mutex_unlock(&pCifsFile->fh_mutex); |
1da177e4 LT |
580 | pCifsInode = CIFS_I(inode); |
581 | if (pCifsInode) { | |
582 | if (can_flush) { | |
cea21805 JL |
583 | rc = filemap_write_and_wait(inode->i_mapping); |
584 | if (rc != 0) | |
585 | CIFS_I(inode)->write_behind_rc = rc; | |
1da177e4 LT |
586 | /* temporarily disable caching while we |
587 | go to server to get inode info */ | |
4b18f2a9 SF |
588 | pCifsInode->clientCanCacheAll = false; |
589 | pCifsInode->clientCanCacheRead = false; | |
7fc8f4e9 | 590 | if (tcon->unix_ext) |
1da177e4 LT |
591 | rc = cifs_get_inode_info_unix(&inode, |
592 | full_path, inode->i_sb, xid); | |
593 | else | |
594 | rc = cifs_get_inode_info(&inode, | |
595 | full_path, NULL, inode->i_sb, | |
8b1327f6 | 596 | xid, NULL); |
1da177e4 LT |
597 | } /* else we are writing out data to server already |
598 | and could deadlock if we tried to flush data, and | |
599 | since we do not know if we have data that would | |
600 | invalidate the current end of file on the server | |
601 | we can not go to the server to get the new inod | |
602 | info */ | |
603 | if ((oplock & 0xF) == OPLOCK_EXCLUSIVE) { | |
4b18f2a9 SF |
604 | pCifsInode->clientCanCacheAll = true; |
605 | pCifsInode->clientCanCacheRead = true; | |
1da177e4 | 606 | cFYI(1, ("Exclusive Oplock granted on inode %p", |
e6a00296 | 607 | file->f_path.dentry->d_inode)); |
1da177e4 | 608 | } else if ((oplock & 0xF) == OPLOCK_READ) { |
4b18f2a9 SF |
609 | pCifsInode->clientCanCacheRead = true; |
610 | pCifsInode->clientCanCacheAll = false; | |
1da177e4 | 611 | } else { |
4b18f2a9 SF |
612 | pCifsInode->clientCanCacheRead = false; |
613 | pCifsInode->clientCanCacheAll = false; | |
1da177e4 LT |
614 | } |
615 | cifs_relock_file(pCifsFile); | |
616 | } | |
617 | } | |
1da177e4 LT |
618 | kfree(full_path); |
619 | FreeXid(xid); | |
620 | return rc; | |
621 | } | |
622 | ||
623 | int cifs_close(struct inode *inode, struct file *file) | |
624 | { | |
625 | int rc = 0; | |
15745320 | 626 | int xid, timeout; |
1da177e4 LT |
627 | struct cifs_sb_info *cifs_sb; |
628 | struct cifsTconInfo *pTcon; | |
629 | struct cifsFileInfo *pSMBFile = | |
630 | (struct cifsFileInfo *)file->private_data; | |
631 | ||
632 | xid = GetXid(); | |
633 | ||
634 | cifs_sb = CIFS_SB(inode->i_sb); | |
635 | pTcon = cifs_sb->tcon; | |
636 | if (pSMBFile) { | |
7ee1af76 | 637 | struct cifsLockInfo *li, *tmp; |
ddb4cbfc | 638 | write_lock(&GlobalSMBSeslock); |
4b18f2a9 | 639 | pSMBFile->closePend = true; |
1da177e4 LT |
640 | if (pTcon) { |
641 | /* no sense reconnecting to close a file that is | |
642 | already closed */ | |
3b795210 | 643 | if (!pTcon->need_reconnect) { |
ddb4cbfc | 644 | write_unlock(&GlobalSMBSeslock); |
15745320 | 645 | timeout = 2; |
fb8c4b14 | 646 | while ((atomic_read(&pSMBFile->wrtPending) != 0) |
15745320 | 647 | && (timeout <= 2048)) { |
23e7dd7d SF |
648 | /* Give write a better chance to get to |
649 | server ahead of the close. We do not | |
650 | want to add a wait_q here as it would | |
651 | increase the memory utilization as | |
652 | the struct would be in each open file, | |
fb8c4b14 | 653 | but this should give enough time to |
23e7dd7d | 654 | clear the socket */ |
90c81e0b SF |
655 | cFYI(DBG2, |
656 | ("close delay, write pending")); | |
23e7dd7d SF |
657 | msleep(timeout); |
658 | timeout *= 4; | |
4891d539 | 659 | } |
fb8c4b14 | 660 | if (atomic_read(&pSMBFile->wrtPending)) |
ddb4cbfc SF |
661 | cERROR(1, ("close with pending write")); |
662 | if (!pTcon->need_reconnect && | |
663 | !pSMBFile->invalidHandle) | |
664 | rc = CIFSSMBClose(xid, pTcon, | |
1da177e4 | 665 | pSMBFile->netfid); |
ddb4cbfc SF |
666 | } else |
667 | write_unlock(&GlobalSMBSeslock); | |
668 | } else | |
669 | write_unlock(&GlobalSMBSeslock); | |
7ee1af76 JA |
670 | |
671 | /* Delete any outstanding lock records. | |
672 | We'll lose them when the file is closed anyway. */ | |
796e5661 | 673 | mutex_lock(&pSMBFile->lock_mutex); |
7ee1af76 JA |
674 | list_for_each_entry_safe(li, tmp, &pSMBFile->llist, llist) { |
675 | list_del(&li->llist); | |
676 | kfree(li); | |
677 | } | |
796e5661 | 678 | mutex_unlock(&pSMBFile->lock_mutex); |
7ee1af76 | 679 | |
cbe0476f | 680 | write_lock(&GlobalSMBSeslock); |
1da177e4 LT |
681 | list_del(&pSMBFile->flist); |
682 | list_del(&pSMBFile->tlist); | |
cbe0476f | 683 | write_unlock(&GlobalSMBSeslock); |
15745320 SF |
684 | timeout = 10; |
685 | /* We waited above to give the SMBWrite a chance to issue | |
686 | on the wire (so we do not get SMBWrite returning EBADF | |
687 | if writepages is racing with close. Note that writepages | |
688 | does not specify a file handle, so it is possible for a file | |
689 | to be opened twice, and the application close the "wrong" | |
690 | file handle - in these cases we delay long enough to allow | |
691 | the SMBWrite to get on the wire before the SMB Close. | |
692 | We allow total wait here over 45 seconds, more than | |
693 | oplock break time, and more than enough to allow any write | |
694 | to complete on the server, or to time out on the client */ | |
695 | while ((atomic_read(&pSMBFile->wrtPending) != 0) | |
696 | && (timeout <= 50000)) { | |
697 | cERROR(1, ("writes pending, delay free of handle")); | |
698 | msleep(timeout); | |
699 | timeout *= 8; | |
700 | } | |
1da177e4 LT |
701 | kfree(file->private_data); |
702 | file->private_data = NULL; | |
703 | } else | |
704 | rc = -EBADF; | |
705 | ||
4efa53f0 | 706 | read_lock(&GlobalSMBSeslock); |
1da177e4 LT |
707 | if (list_empty(&(CIFS_I(inode)->openFileList))) { |
708 | cFYI(1, ("closing last open instance for inode %p", inode)); | |
709 | /* if the file is not open we do not know if we can cache info | |
710 | on this inode, much less write behind and read ahead */ | |
4b18f2a9 SF |
711 | CIFS_I(inode)->clientCanCacheRead = false; |
712 | CIFS_I(inode)->clientCanCacheAll = false; | |
1da177e4 | 713 | } |
4efa53f0 | 714 | read_unlock(&GlobalSMBSeslock); |
fb8c4b14 | 715 | if ((rc == 0) && CIFS_I(inode)->write_behind_rc) |
1da177e4 LT |
716 | rc = CIFS_I(inode)->write_behind_rc; |
717 | FreeXid(xid); | |
718 | return rc; | |
719 | } | |
720 | ||
721 | int cifs_closedir(struct inode *inode, struct file *file) | |
722 | { | |
723 | int rc = 0; | |
724 | int xid; | |
725 | struct cifsFileInfo *pCFileStruct = | |
726 | (struct cifsFileInfo *)file->private_data; | |
727 | char *ptmp; | |
728 | ||
26a21b98 | 729 | cFYI(1, ("Closedir inode = 0x%p", inode)); |
1da177e4 LT |
730 | |
731 | xid = GetXid(); | |
732 | ||
733 | if (pCFileStruct) { | |
734 | struct cifsTconInfo *pTcon; | |
fb8c4b14 SF |
735 | struct cifs_sb_info *cifs_sb = |
736 | CIFS_SB(file->f_path.dentry->d_sb); | |
1da177e4 LT |
737 | |
738 | pTcon = cifs_sb->tcon; | |
739 | ||
740 | cFYI(1, ("Freeing private data in close dir")); | |
ddb4cbfc | 741 | write_lock(&GlobalSMBSeslock); |
4b18f2a9 SF |
742 | if (!pCFileStruct->srch_inf.endOfSearch && |
743 | !pCFileStruct->invalidHandle) { | |
744 | pCFileStruct->invalidHandle = true; | |
ddb4cbfc | 745 | write_unlock(&GlobalSMBSeslock); |
1da177e4 LT |
746 | rc = CIFSFindClose(xid, pTcon, pCFileStruct->netfid); |
747 | cFYI(1, ("Closing uncompleted readdir with rc %d", | |
748 | rc)); | |
749 | /* not much we can do if it fails anyway, ignore rc */ | |
750 | rc = 0; | |
ddb4cbfc SF |
751 | } else |
752 | write_unlock(&GlobalSMBSeslock); | |
1da177e4 LT |
753 | ptmp = pCFileStruct->srch_inf.ntwrk_buf_start; |
754 | if (ptmp) { | |
ec637e3f | 755 | cFYI(1, ("closedir free smb buf in srch struct")); |
1da177e4 | 756 | pCFileStruct->srch_inf.ntwrk_buf_start = NULL; |
fb8c4b14 | 757 | if (pCFileStruct->srch_inf.smallBuf) |
d47d7c1a SF |
758 | cifs_small_buf_release(ptmp); |
759 | else | |
760 | cifs_buf_release(ptmp); | |
1da177e4 | 761 | } |
1da177e4 LT |
762 | kfree(file->private_data); |
763 | file->private_data = NULL; | |
764 | } | |
765 | /* BB can we lock the filestruct while this is going on? */ | |
766 | FreeXid(xid); | |
767 | return rc; | |
768 | } | |
769 | ||
7ee1af76 JA |
770 | static int store_file_lock(struct cifsFileInfo *fid, __u64 len, |
771 | __u64 offset, __u8 lockType) | |
772 | { | |
fb8c4b14 SF |
773 | struct cifsLockInfo *li = |
774 | kmalloc(sizeof(struct cifsLockInfo), GFP_KERNEL); | |
7ee1af76 JA |
775 | if (li == NULL) |
776 | return -ENOMEM; | |
777 | li->offset = offset; | |
778 | li->length = len; | |
779 | li->type = lockType; | |
796e5661 | 780 | mutex_lock(&fid->lock_mutex); |
7ee1af76 | 781 | list_add(&li->llist, &fid->llist); |
796e5661 | 782 | mutex_unlock(&fid->lock_mutex); |
7ee1af76 JA |
783 | return 0; |
784 | } | |
785 | ||
1da177e4 LT |
786 | int cifs_lock(struct file *file, int cmd, struct file_lock *pfLock) |
787 | { | |
788 | int rc, xid; | |
1da177e4 LT |
789 | __u32 numLock = 0; |
790 | __u32 numUnlock = 0; | |
791 | __u64 length; | |
4b18f2a9 | 792 | bool wait_flag = false; |
1da177e4 | 793 | struct cifs_sb_info *cifs_sb; |
13a6e42a | 794 | struct cifsTconInfo *tcon; |
08547b03 SF |
795 | __u16 netfid; |
796 | __u8 lockType = LOCKING_ANDX_LARGE_FILES; | |
13a6e42a | 797 | bool posix_locking = 0; |
1da177e4 LT |
798 | |
799 | length = 1 + pfLock->fl_end - pfLock->fl_start; | |
800 | rc = -EACCES; | |
801 | xid = GetXid(); | |
802 | ||
803 | cFYI(1, ("Lock parm: 0x%x flockflags: " | |
804 | "0x%x flocktype: 0x%x start: %lld end: %lld", | |
fb8c4b14 SF |
805 | cmd, pfLock->fl_flags, pfLock->fl_type, pfLock->fl_start, |
806 | pfLock->fl_end)); | |
1da177e4 LT |
807 | |
808 | if (pfLock->fl_flags & FL_POSIX) | |
d47d7c1a | 809 | cFYI(1, ("Posix")); |
1da177e4 | 810 | if (pfLock->fl_flags & FL_FLOCK) |
d47d7c1a | 811 | cFYI(1, ("Flock")); |
1da177e4 | 812 | if (pfLock->fl_flags & FL_SLEEP) { |
d47d7c1a | 813 | cFYI(1, ("Blocking lock")); |
4b18f2a9 | 814 | wait_flag = true; |
1da177e4 LT |
815 | } |
816 | if (pfLock->fl_flags & FL_ACCESS) | |
817 | cFYI(1, ("Process suspended by mandatory locking - " | |
26a21b98 | 818 | "not implemented yet")); |
1da177e4 LT |
819 | if (pfLock->fl_flags & FL_LEASE) |
820 | cFYI(1, ("Lease on file - not implemented yet")); | |
fb8c4b14 | 821 | if (pfLock->fl_flags & |
1da177e4 LT |
822 | (~(FL_POSIX | FL_FLOCK | FL_SLEEP | FL_ACCESS | FL_LEASE))) |
823 | cFYI(1, ("Unknown lock flags 0x%x", pfLock->fl_flags)); | |
824 | ||
825 | if (pfLock->fl_type == F_WRLCK) { | |
826 | cFYI(1, ("F_WRLCK ")); | |
827 | numLock = 1; | |
828 | } else if (pfLock->fl_type == F_UNLCK) { | |
d47d7c1a | 829 | cFYI(1, ("F_UNLCK")); |
1da177e4 | 830 | numUnlock = 1; |
d47d7c1a SF |
831 | /* Check if unlock includes more than |
832 | one lock range */ | |
1da177e4 | 833 | } else if (pfLock->fl_type == F_RDLCK) { |
d47d7c1a | 834 | cFYI(1, ("F_RDLCK")); |
1da177e4 LT |
835 | lockType |= LOCKING_ANDX_SHARED_LOCK; |
836 | numLock = 1; | |
837 | } else if (pfLock->fl_type == F_EXLCK) { | |
d47d7c1a | 838 | cFYI(1, ("F_EXLCK")); |
1da177e4 LT |
839 | numLock = 1; |
840 | } else if (pfLock->fl_type == F_SHLCK) { | |
d47d7c1a | 841 | cFYI(1, ("F_SHLCK")); |
1da177e4 LT |
842 | lockType |= LOCKING_ANDX_SHARED_LOCK; |
843 | numLock = 1; | |
844 | } else | |
d47d7c1a | 845 | cFYI(1, ("Unknown type of lock")); |
1da177e4 | 846 | |
e6a00296 | 847 | cifs_sb = CIFS_SB(file->f_path.dentry->d_sb); |
13a6e42a | 848 | tcon = cifs_sb->tcon; |
1da177e4 LT |
849 | |
850 | if (file->private_data == NULL) { | |
0f3bc09e | 851 | rc = -EBADF; |
1da177e4 | 852 | FreeXid(xid); |
0f3bc09e | 853 | return rc; |
1da177e4 | 854 | } |
08547b03 SF |
855 | netfid = ((struct cifsFileInfo *)file->private_data)->netfid; |
856 | ||
13a6e42a SF |
857 | if ((tcon->ses->capabilities & CAP_UNIX) && |
858 | (CIFS_UNIX_FCNTL_CAP & le64_to_cpu(tcon->fsUnixInfo.Capability)) && | |
acc18aa1 | 859 | ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NOPOSIXBRL) == 0)) |
13a6e42a | 860 | posix_locking = 1; |
08547b03 SF |
861 | /* BB add code here to normalize offset and length to |
862 | account for negative length which we can not accept over the | |
863 | wire */ | |
1da177e4 | 864 | if (IS_GETLK(cmd)) { |
fb8c4b14 | 865 | if (posix_locking) { |
08547b03 | 866 | int posix_lock_type; |
fb8c4b14 | 867 | if (lockType & LOCKING_ANDX_SHARED_LOCK) |
08547b03 SF |
868 | posix_lock_type = CIFS_RDLCK; |
869 | else | |
870 | posix_lock_type = CIFS_WRLCK; | |
13a6e42a | 871 | rc = CIFSSMBPosixLock(xid, tcon, netfid, 1 /* get */, |
fc94cdb9 | 872 | length, pfLock, |
08547b03 SF |
873 | posix_lock_type, wait_flag); |
874 | FreeXid(xid); | |
875 | return rc; | |
876 | } | |
877 | ||
878 | /* BB we could chain these into one lock request BB */ | |
13a6e42a | 879 | rc = CIFSSMBLock(xid, tcon, netfid, length, pfLock->fl_start, |
08547b03 | 880 | 0, 1, lockType, 0 /* wait flag */ ); |
1da177e4 | 881 | if (rc == 0) { |
13a6e42a | 882 | rc = CIFSSMBLock(xid, tcon, netfid, length, |
1da177e4 LT |
883 | pfLock->fl_start, 1 /* numUnlock */ , |
884 | 0 /* numLock */ , lockType, | |
885 | 0 /* wait flag */ ); | |
886 | pfLock->fl_type = F_UNLCK; | |
887 | if (rc != 0) | |
888 | cERROR(1, ("Error unlocking previously locked " | |
08547b03 | 889 | "range %d during test of lock", rc)); |
1da177e4 LT |
890 | rc = 0; |
891 | ||
892 | } else { | |
893 | /* if rc == ERR_SHARING_VIOLATION ? */ | |
894 | rc = 0; /* do not change lock type to unlock | |
895 | since range in use */ | |
896 | } | |
897 | ||
898 | FreeXid(xid); | |
899 | return rc; | |
900 | } | |
7ee1af76 JA |
901 | |
902 | if (!numLock && !numUnlock) { | |
903 | /* if no lock or unlock then nothing | |
904 | to do since we do not know what it is */ | |
905 | FreeXid(xid); | |
906 | return -EOPNOTSUPP; | |
907 | } | |
908 | ||
909 | if (posix_locking) { | |
08547b03 | 910 | int posix_lock_type; |
fb8c4b14 | 911 | if (lockType & LOCKING_ANDX_SHARED_LOCK) |
08547b03 SF |
912 | posix_lock_type = CIFS_RDLCK; |
913 | else | |
914 | posix_lock_type = CIFS_WRLCK; | |
50c2f753 | 915 | |
fb8c4b14 | 916 | if (numUnlock == 1) |
beb84dc8 | 917 | posix_lock_type = CIFS_UNLCK; |
7ee1af76 | 918 | |
13a6e42a | 919 | rc = CIFSSMBPosixLock(xid, tcon, netfid, 0 /* set */, |
fc94cdb9 | 920 | length, pfLock, |
08547b03 | 921 | posix_lock_type, wait_flag); |
7ee1af76 | 922 | } else { |
fb8c4b14 SF |
923 | struct cifsFileInfo *fid = |
924 | (struct cifsFileInfo *)file->private_data; | |
7ee1af76 JA |
925 | |
926 | if (numLock) { | |
13a6e42a | 927 | rc = CIFSSMBLock(xid, tcon, netfid, length, |
fb8c4b14 | 928 | pfLock->fl_start, |
7ee1af76 JA |
929 | 0, numLock, lockType, wait_flag); |
930 | ||
931 | if (rc == 0) { | |
932 | /* For Windows locks we must store them. */ | |
933 | rc = store_file_lock(fid, length, | |
934 | pfLock->fl_start, lockType); | |
935 | } | |
936 | } else if (numUnlock) { | |
937 | /* For each stored lock that this unlock overlaps | |
938 | completely, unlock it. */ | |
939 | int stored_rc = 0; | |
940 | struct cifsLockInfo *li, *tmp; | |
941 | ||
6b70c955 | 942 | rc = 0; |
796e5661 | 943 | mutex_lock(&fid->lock_mutex); |
7ee1af76 JA |
944 | list_for_each_entry_safe(li, tmp, &fid->llist, llist) { |
945 | if (pfLock->fl_start <= li->offset && | |
c19eb710 | 946 | (pfLock->fl_start + length) >= |
39db810c | 947 | (li->offset + li->length)) { |
13a6e42a | 948 | stored_rc = CIFSSMBLock(xid, tcon, |
fb8c4b14 | 949 | netfid, |
7ee1af76 | 950 | li->length, li->offset, |
4b18f2a9 | 951 | 1, 0, li->type, false); |
7ee1af76 JA |
952 | if (stored_rc) |
953 | rc = stored_rc; | |
954 | ||
955 | list_del(&li->llist); | |
956 | kfree(li); | |
957 | } | |
958 | } | |
796e5661 | 959 | mutex_unlock(&fid->lock_mutex); |
7ee1af76 JA |
960 | } |
961 | } | |
962 | ||
d634cc15 | 963 | if (pfLock->fl_flags & FL_POSIX) |
1da177e4 LT |
964 | posix_lock_file_wait(file, pfLock); |
965 | FreeXid(xid); | |
966 | return rc; | |
967 | } | |
968 | ||
fbec9ab9 JL |
969 | /* |
970 | * Set the timeout on write requests past EOF. For some servers (Windows) | |
971 | * these calls can be very long. | |
972 | * | |
973 | * If we're writing >10M past the EOF we give a 180s timeout. Anything less | |
974 | * than that gets a 45s timeout. Writes not past EOF get 15s timeouts. | |
975 | * The 10M cutoff is totally arbitrary. A better scheme for this would be | |
976 | * welcome if someone wants to suggest one. | |
977 | * | |
978 | * We may be able to do a better job with this if there were some way to | |
979 | * declare that a file should be sparse. | |
980 | */ | |
981 | static int | |
982 | cifs_write_timeout(struct cifsInodeInfo *cifsi, loff_t offset) | |
983 | { | |
984 | if (offset <= cifsi->server_eof) | |
985 | return CIFS_STD_OP; | |
986 | else if (offset > (cifsi->server_eof + (10 * 1024 * 1024))) | |
987 | return CIFS_VLONG_OP; | |
988 | else | |
989 | return CIFS_LONG_OP; | |
990 | } | |
991 | ||
992 | /* update the file size (if needed) after a write */ | |
993 | static void | |
994 | cifs_update_eof(struct cifsInodeInfo *cifsi, loff_t offset, | |
995 | unsigned int bytes_written) | |
996 | { | |
997 | loff_t end_of_write = offset + bytes_written; | |
998 | ||
999 | if (end_of_write > cifsi->server_eof) | |
1000 | cifsi->server_eof = end_of_write; | |
1001 | } | |
1002 | ||
1da177e4 LT |
1003 | ssize_t cifs_user_write(struct file *file, const char __user *write_data, |
1004 | size_t write_size, loff_t *poffset) | |
1005 | { | |
1006 | int rc = 0; | |
1007 | unsigned int bytes_written = 0; | |
1008 | unsigned int total_written; | |
1009 | struct cifs_sb_info *cifs_sb; | |
1010 | struct cifsTconInfo *pTcon; | |
1011 | int xid, long_op; | |
1012 | struct cifsFileInfo *open_file; | |
fbec9ab9 | 1013 | struct cifsInodeInfo *cifsi = CIFS_I(file->f_path.dentry->d_inode); |
1da177e4 | 1014 | |
e6a00296 | 1015 | cifs_sb = CIFS_SB(file->f_path.dentry->d_sb); |
1da177e4 LT |
1016 | |
1017 | pTcon = cifs_sb->tcon; | |
1018 | ||
1019 | /* cFYI(1, | |
1020 | (" write %d bytes to offset %lld of %s", write_size, | |
e6a00296 | 1021 | *poffset, file->f_path.dentry->d_name.name)); */ |
1da177e4 LT |
1022 | |
1023 | if (file->private_data == NULL) | |
1024 | return -EBADF; | |
c33f8d32 | 1025 | open_file = (struct cifsFileInfo *) file->private_data; |
50c2f753 | 1026 | |
838726c4 JL |
1027 | rc = generic_write_checks(file, poffset, &write_size, 0); |
1028 | if (rc) | |
1029 | return rc; | |
1030 | ||
1da177e4 | 1031 | xid = GetXid(); |
1da177e4 | 1032 | |
fbec9ab9 | 1033 | long_op = cifs_write_timeout(cifsi, *poffset); |
1da177e4 LT |
1034 | for (total_written = 0; write_size > total_written; |
1035 | total_written += bytes_written) { | |
1036 | rc = -EAGAIN; | |
1037 | while (rc == -EAGAIN) { | |
1038 | if (file->private_data == NULL) { | |
1039 | /* file has been closed on us */ | |
1040 | FreeXid(xid); | |
1041 | /* if we have gotten here we have written some data | |
1042 | and blocked, and the file has been freed on us while | |
1043 | we blocked so return what we managed to write */ | |
1044 | return total_written; | |
fb8c4b14 | 1045 | } |
1da177e4 LT |
1046 | if (open_file->closePend) { |
1047 | FreeXid(xid); | |
1048 | if (total_written) | |
1049 | return total_written; | |
1050 | else | |
1051 | return -EBADF; | |
1052 | } | |
1053 | if (open_file->invalidHandle) { | |
1da177e4 LT |
1054 | /* we could deadlock if we called |
1055 | filemap_fdatawait from here so tell | |
1056 | reopen_file not to flush data to server | |
1057 | now */ | |
4b18f2a9 | 1058 | rc = cifs_reopen_file(file, false); |
1da177e4 LT |
1059 | if (rc != 0) |
1060 | break; | |
1061 | } | |
1062 | ||
1063 | rc = CIFSSMBWrite(xid, pTcon, | |
1064 | open_file->netfid, | |
1065 | min_t(const int, cifs_sb->wsize, | |
1066 | write_size - total_written), | |
1067 | *poffset, &bytes_written, | |
1068 | NULL, write_data + total_written, long_op); | |
1069 | } | |
1070 | if (rc || (bytes_written == 0)) { | |
1071 | if (total_written) | |
1072 | break; | |
1073 | else { | |
1074 | FreeXid(xid); | |
1075 | return rc; | |
1076 | } | |
fbec9ab9 JL |
1077 | } else { |
1078 | cifs_update_eof(cifsi, *poffset, bytes_written); | |
1da177e4 | 1079 | *poffset += bytes_written; |
fbec9ab9 | 1080 | } |
133672ef | 1081 | long_op = CIFS_STD_OP; /* subsequent writes fast - |
1da177e4 LT |
1082 | 15 seconds is plenty */ |
1083 | } | |
1084 | ||
a4544347 | 1085 | cifs_stats_bytes_written(pTcon, total_written); |
1da177e4 LT |
1086 | |
1087 | /* since the write may have blocked check these pointers again */ | |
3677db10 SF |
1088 | if ((file->f_path.dentry) && (file->f_path.dentry->d_inode)) { |
1089 | struct inode *inode = file->f_path.dentry->d_inode; | |
fb8c4b14 SF |
1090 | /* Do not update local mtime - server will set its actual value on write |
1091 | * inode->i_ctime = inode->i_mtime = | |
3677db10 SF |
1092 | * current_fs_time(inode->i_sb);*/ |
1093 | if (total_written > 0) { | |
1094 | spin_lock(&inode->i_lock); | |
1095 | if (*poffset > file->f_path.dentry->d_inode->i_size) | |
1096 | i_size_write(file->f_path.dentry->d_inode, | |
1da177e4 | 1097 | *poffset); |
3677db10 | 1098 | spin_unlock(&inode->i_lock); |
1da177e4 | 1099 | } |
fb8c4b14 | 1100 | mark_inode_dirty_sync(file->f_path.dentry->d_inode); |
1da177e4 LT |
1101 | } |
1102 | FreeXid(xid); | |
1103 | return total_written; | |
1104 | } | |
1105 | ||
1106 | static ssize_t cifs_write(struct file *file, const char *write_data, | |
d9414774 | 1107 | size_t write_size, loff_t *poffset) |
1da177e4 LT |
1108 | { |
1109 | int rc = 0; | |
1110 | unsigned int bytes_written = 0; | |
1111 | unsigned int total_written; | |
1112 | struct cifs_sb_info *cifs_sb; | |
1113 | struct cifsTconInfo *pTcon; | |
1114 | int xid, long_op; | |
1115 | struct cifsFileInfo *open_file; | |
fbec9ab9 | 1116 | struct cifsInodeInfo *cifsi = CIFS_I(file->f_path.dentry->d_inode); |
1da177e4 | 1117 | |
e6a00296 | 1118 | cifs_sb = CIFS_SB(file->f_path.dentry->d_sb); |
1da177e4 LT |
1119 | |
1120 | pTcon = cifs_sb->tcon; | |
1121 | ||
fb8c4b14 | 1122 | cFYI(1, ("write %zd bytes to offset %lld of %s", write_size, |
e6a00296 | 1123 | *poffset, file->f_path.dentry->d_name.name)); |
1da177e4 LT |
1124 | |
1125 | if (file->private_data == NULL) | |
1126 | return -EBADF; | |
c33f8d32 | 1127 | open_file = (struct cifsFileInfo *)file->private_data; |
50c2f753 | 1128 | |
1da177e4 | 1129 | xid = GetXid(); |
1da177e4 | 1130 | |
fbec9ab9 | 1131 | long_op = cifs_write_timeout(cifsi, *poffset); |
1da177e4 LT |
1132 | for (total_written = 0; write_size > total_written; |
1133 | total_written += bytes_written) { | |
1134 | rc = -EAGAIN; | |
1135 | while (rc == -EAGAIN) { | |
1136 | if (file->private_data == NULL) { | |
1137 | /* file has been closed on us */ | |
1138 | FreeXid(xid); | |
1139 | /* if we have gotten here we have written some data | |
1140 | and blocked, and the file has been freed on us | |
fb8c4b14 | 1141 | while we blocked so return what we managed to |
1da177e4 LT |
1142 | write */ |
1143 | return total_written; | |
fb8c4b14 | 1144 | } |
1da177e4 LT |
1145 | if (open_file->closePend) { |
1146 | FreeXid(xid); | |
1147 | if (total_written) | |
1148 | return total_written; | |
1149 | else | |
1150 | return -EBADF; | |
1151 | } | |
1152 | if (open_file->invalidHandle) { | |
1da177e4 LT |
1153 | /* we could deadlock if we called |
1154 | filemap_fdatawait from here so tell | |
fb8c4b14 | 1155 | reopen_file not to flush data to |
1da177e4 | 1156 | server now */ |
4b18f2a9 | 1157 | rc = cifs_reopen_file(file, false); |
1da177e4 LT |
1158 | if (rc != 0) |
1159 | break; | |
1160 | } | |
fb8c4b14 SF |
1161 | if (experimEnabled || (pTcon->ses->server && |
1162 | ((pTcon->ses->server->secMode & | |
08775834 | 1163 | (SECMODE_SIGN_REQUIRED | SECMODE_SIGN_ENABLED)) |
c01f36a8 | 1164 | == 0))) { |
3e84469d SF |
1165 | struct kvec iov[2]; |
1166 | unsigned int len; | |
1167 | ||
0ae0efad | 1168 | len = min((size_t)cifs_sb->wsize, |
3e84469d SF |
1169 | write_size - total_written); |
1170 | /* iov[0] is reserved for smb header */ | |
1171 | iov[1].iov_base = (char *)write_data + | |
1172 | total_written; | |
1173 | iov[1].iov_len = len; | |
d6e04ae6 | 1174 | rc = CIFSSMBWrite2(xid, pTcon, |
3e84469d | 1175 | open_file->netfid, len, |
d6e04ae6 | 1176 | *poffset, &bytes_written, |
3e84469d | 1177 | iov, 1, long_op); |
d6e04ae6 | 1178 | } else |
60808233 SF |
1179 | rc = CIFSSMBWrite(xid, pTcon, |
1180 | open_file->netfid, | |
1181 | min_t(const int, cifs_sb->wsize, | |
1182 | write_size - total_written), | |
1183 | *poffset, &bytes_written, | |
1184 | write_data + total_written, | |
1185 | NULL, long_op); | |
1da177e4 LT |
1186 | } |
1187 | if (rc || (bytes_written == 0)) { | |
1188 | if (total_written) | |
1189 | break; | |
1190 | else { | |
1191 | FreeXid(xid); | |
1192 | return rc; | |
1193 | } | |
fbec9ab9 JL |
1194 | } else { |
1195 | cifs_update_eof(cifsi, *poffset, bytes_written); | |
1da177e4 | 1196 | *poffset += bytes_written; |
fbec9ab9 | 1197 | } |
133672ef | 1198 | long_op = CIFS_STD_OP; /* subsequent writes fast - |
1da177e4 LT |
1199 | 15 seconds is plenty */ |
1200 | } | |
1201 | ||
a4544347 | 1202 | cifs_stats_bytes_written(pTcon, total_written); |
1da177e4 LT |
1203 | |
1204 | /* since the write may have blocked check these pointers again */ | |
3677db10 | 1205 | if ((file->f_path.dentry) && (file->f_path.dentry->d_inode)) { |
004c46b9 | 1206 | /*BB We could make this contingent on superblock ATIME flag too */ |
3677db10 SF |
1207 | /* file->f_path.dentry->d_inode->i_ctime = |
1208 | file->f_path.dentry->d_inode->i_mtime = CURRENT_TIME;*/ | |
1209 | if (total_written > 0) { | |
1210 | spin_lock(&file->f_path.dentry->d_inode->i_lock); | |
1211 | if (*poffset > file->f_path.dentry->d_inode->i_size) | |
1212 | i_size_write(file->f_path.dentry->d_inode, | |
1213 | *poffset); | |
1214 | spin_unlock(&file->f_path.dentry->d_inode->i_lock); | |
1da177e4 | 1215 | } |
3677db10 | 1216 | mark_inode_dirty_sync(file->f_path.dentry->d_inode); |
1da177e4 LT |
1217 | } |
1218 | FreeXid(xid); | |
1219 | return total_written; | |
1220 | } | |
1221 | ||
630f3f0c SF |
1222 | #ifdef CONFIG_CIFS_EXPERIMENTAL |
1223 | struct cifsFileInfo *find_readable_file(struct cifsInodeInfo *cifs_inode) | |
1224 | { | |
1225 | struct cifsFileInfo *open_file = NULL; | |
1226 | ||
1227 | read_lock(&GlobalSMBSeslock); | |
1228 | /* we could simply get the first_list_entry since write-only entries | |
1229 | are always at the end of the list but since the first entry might | |
1230 | have a close pending, we go through the whole list */ | |
1231 | list_for_each_entry(open_file, &cifs_inode->openFileList, flist) { | |
1232 | if (open_file->closePend) | |
1233 | continue; | |
1234 | if (open_file->pfile && ((open_file->pfile->f_flags & O_RDWR) || | |
1235 | (open_file->pfile->f_flags & O_RDONLY))) { | |
1236 | if (!open_file->invalidHandle) { | |
1237 | /* found a good file */ | |
1238 | /* lock it so it will not be closed on us */ | |
1239 | atomic_inc(&open_file->wrtPending); | |
1240 | read_unlock(&GlobalSMBSeslock); | |
1241 | return open_file; | |
1242 | } /* else might as well continue, and look for | |
1243 | another, or simply have the caller reopen it | |
1244 | again rather than trying to fix this handle */ | |
1245 | } else /* write only file */ | |
1246 | break; /* write only files are last so must be done */ | |
1247 | } | |
1248 | read_unlock(&GlobalSMBSeslock); | |
1249 | return NULL; | |
1250 | } | |
1251 | #endif | |
1252 | ||
dd99cd80 | 1253 | struct cifsFileInfo *find_writable_file(struct cifsInodeInfo *cifs_inode) |
6148a742 SF |
1254 | { |
1255 | struct cifsFileInfo *open_file; | |
2846d386 | 1256 | bool any_available = false; |
dd99cd80 | 1257 | int rc; |
6148a742 | 1258 | |
60808233 SF |
1259 | /* Having a null inode here (because mapping->host was set to zero by |
1260 | the VFS or MM) should not happen but we had reports of on oops (due to | |
1261 | it being zero) during stress testcases so we need to check for it */ | |
1262 | ||
fb8c4b14 SF |
1263 | if (cifs_inode == NULL) { |
1264 | cERROR(1, ("Null inode passed to cifs_writeable_file")); | |
60808233 SF |
1265 | dump_stack(); |
1266 | return NULL; | |
1267 | } | |
1268 | ||
6148a742 | 1269 | read_lock(&GlobalSMBSeslock); |
9b22b0b7 | 1270 | refind_writable: |
6148a742 | 1271 | list_for_each_entry(open_file, &cifs_inode->openFileList, flist) { |
2846d386 JL |
1272 | if (open_file->closePend || |
1273 | (!any_available && open_file->pid != current->tgid)) | |
6148a742 | 1274 | continue; |
2846d386 | 1275 | |
6148a742 SF |
1276 | if (open_file->pfile && |
1277 | ((open_file->pfile->f_flags & O_RDWR) || | |
1278 | (open_file->pfile->f_flags & O_WRONLY))) { | |
23e7dd7d | 1279 | atomic_inc(&open_file->wrtPending); |
9b22b0b7 SF |
1280 | |
1281 | if (!open_file->invalidHandle) { | |
1282 | /* found a good writable file */ | |
1283 | read_unlock(&GlobalSMBSeslock); | |
1284 | return open_file; | |
1285 | } | |
8840dee9 | 1286 | |
6148a742 | 1287 | read_unlock(&GlobalSMBSeslock); |
9b22b0b7 | 1288 | /* Had to unlock since following call can block */ |
4b18f2a9 | 1289 | rc = cifs_reopen_file(open_file->pfile, false); |
8840dee9 | 1290 | if (!rc) { |
9b22b0b7 SF |
1291 | if (!open_file->closePend) |
1292 | return open_file; | |
1293 | else { /* start over in case this was deleted */ | |
1294 | /* since the list could be modified */ | |
37c0eb46 | 1295 | read_lock(&GlobalSMBSeslock); |
15745320 | 1296 | atomic_dec(&open_file->wrtPending); |
9b22b0b7 | 1297 | goto refind_writable; |
37c0eb46 SF |
1298 | } |
1299 | } | |
9b22b0b7 SF |
1300 | |
1301 | /* if it fails, try another handle if possible - | |
1302 | (we can not do this if closePending since | |
1303 | loop could be modified - in which case we | |
1304 | have to start at the beginning of the list | |
1305 | again. Note that it would be bad | |
1306 | to hold up writepages here (rather than | |
1307 | in caller) with continuous retries */ | |
1308 | cFYI(1, ("wp failed on reopen file")); | |
1309 | read_lock(&GlobalSMBSeslock); | |
1310 | /* can not use this handle, no write | |
1311 | pending on this one after all */ | |
1312 | atomic_dec(&open_file->wrtPending); | |
8840dee9 | 1313 | |
9b22b0b7 SF |
1314 | if (open_file->closePend) /* list could have changed */ |
1315 | goto refind_writable; | |
1316 | /* else we simply continue to the next entry. Thus | |
1317 | we do not loop on reopen errors. If we | |
1318 | can not reopen the file, for example if we | |
1319 | reconnected to a server with another client | |
1320 | racing to delete or lock the file we would not | |
1321 | make progress if we restarted before the beginning | |
1322 | of the loop here. */ | |
6148a742 SF |
1323 | } |
1324 | } | |
2846d386 JL |
1325 | /* couldn't find useable FH with same pid, try any available */ |
1326 | if (!any_available) { | |
1327 | any_available = true; | |
1328 | goto refind_writable; | |
1329 | } | |
6148a742 SF |
1330 | read_unlock(&GlobalSMBSeslock); |
1331 | return NULL; | |
1332 | } | |
1333 | ||
1da177e4 LT |
1334 | static int cifs_partialpagewrite(struct page *page, unsigned from, unsigned to) |
1335 | { | |
1336 | struct address_space *mapping = page->mapping; | |
1337 | loff_t offset = (loff_t)page->index << PAGE_CACHE_SHIFT; | |
1338 | char *write_data; | |
1339 | int rc = -EFAULT; | |
1340 | int bytes_written = 0; | |
1341 | struct cifs_sb_info *cifs_sb; | |
1342 | struct cifsTconInfo *pTcon; | |
1343 | struct inode *inode; | |
6148a742 | 1344 | struct cifsFileInfo *open_file; |
1da177e4 LT |
1345 | |
1346 | if (!mapping || !mapping->host) | |
1347 | return -EFAULT; | |
1348 | ||
1349 | inode = page->mapping->host; | |
1350 | cifs_sb = CIFS_SB(inode->i_sb); | |
1351 | pTcon = cifs_sb->tcon; | |
1352 | ||
1353 | offset += (loff_t)from; | |
1354 | write_data = kmap(page); | |
1355 | write_data += from; | |
1356 | ||
1357 | if ((to > PAGE_CACHE_SIZE) || (from > to)) { | |
1358 | kunmap(page); | |
1359 | return -EIO; | |
1360 | } | |
1361 | ||
1362 | /* racing with truncate? */ | |
1363 | if (offset > mapping->host->i_size) { | |
1364 | kunmap(page); | |
1365 | return 0; /* don't care */ | |
1366 | } | |
1367 | ||
1368 | /* check to make sure that we are not extending the file */ | |
1369 | if (mapping->host->i_size - offset < (loff_t)to) | |
fb8c4b14 | 1370 | to = (unsigned)(mapping->host->i_size - offset); |
1da177e4 | 1371 | |
6148a742 SF |
1372 | open_file = find_writable_file(CIFS_I(mapping->host)); |
1373 | if (open_file) { | |
1374 | bytes_written = cifs_write(open_file->pfile, write_data, | |
1375 | to-from, &offset); | |
23e7dd7d | 1376 | atomic_dec(&open_file->wrtPending); |
1da177e4 | 1377 | /* Does mm or vfs already set times? */ |
6148a742 | 1378 | inode->i_atime = inode->i_mtime = current_fs_time(inode->i_sb); |
bb5a9a04 | 1379 | if ((bytes_written > 0) && (offset)) |
6148a742 | 1380 | rc = 0; |
bb5a9a04 SF |
1381 | else if (bytes_written < 0) |
1382 | rc = bytes_written; | |
6148a742 | 1383 | } else { |
1da177e4 LT |
1384 | cFYI(1, ("No writeable filehandles for inode")); |
1385 | rc = -EIO; | |
1386 | } | |
1387 | ||
1388 | kunmap(page); | |
1389 | return rc; | |
1390 | } | |
1391 | ||
1da177e4 | 1392 | static int cifs_writepages(struct address_space *mapping, |
37c0eb46 | 1393 | struct writeback_control *wbc) |
1da177e4 | 1394 | { |
37c0eb46 SF |
1395 | struct backing_dev_info *bdi = mapping->backing_dev_info; |
1396 | unsigned int bytes_to_write; | |
1397 | unsigned int bytes_written; | |
1398 | struct cifs_sb_info *cifs_sb; | |
1399 | int done = 0; | |
111ebb6e | 1400 | pgoff_t end; |
37c0eb46 | 1401 | pgoff_t index; |
fb8c4b14 SF |
1402 | int range_whole = 0; |
1403 | struct kvec *iov; | |
84d2f07e | 1404 | int len; |
37c0eb46 SF |
1405 | int n_iov = 0; |
1406 | pgoff_t next; | |
1407 | int nr_pages; | |
1408 | __u64 offset = 0; | |
23e7dd7d | 1409 | struct cifsFileInfo *open_file; |
fbec9ab9 | 1410 | struct cifsInodeInfo *cifsi = CIFS_I(mapping->host); |
37c0eb46 SF |
1411 | struct page *page; |
1412 | struct pagevec pvec; | |
1413 | int rc = 0; | |
1414 | int scanned = 0; | |
fbec9ab9 | 1415 | int xid, long_op; |
1da177e4 | 1416 | |
37c0eb46 | 1417 | cifs_sb = CIFS_SB(mapping->host->i_sb); |
50c2f753 | 1418 | |
37c0eb46 SF |
1419 | /* |
1420 | * If wsize is smaller that the page cache size, default to writing | |
1421 | * one page at a time via cifs_writepage | |
1422 | */ | |
1423 | if (cifs_sb->wsize < PAGE_CACHE_SIZE) | |
1424 | return generic_writepages(mapping, wbc); | |
1425 | ||
fb8c4b14 SF |
1426 | if ((cifs_sb->tcon->ses) && (cifs_sb->tcon->ses->server)) |
1427 | if (cifs_sb->tcon->ses->server->secMode & | |
1428 | (SECMODE_SIGN_REQUIRED | SECMODE_SIGN_ENABLED)) | |
1429 | if (!experimEnabled) | |
60808233 | 1430 | return generic_writepages(mapping, wbc); |
4a77118c | 1431 | |
9a0c8230 | 1432 | iov = kmalloc(32 * sizeof(struct kvec), GFP_KERNEL); |
fb8c4b14 | 1433 | if (iov == NULL) |
9a0c8230 SF |
1434 | return generic_writepages(mapping, wbc); |
1435 | ||
1436 | ||
37c0eb46 SF |
1437 | /* |
1438 | * BB: Is this meaningful for a non-block-device file system? | |
1439 | * If it is, we should test it again after we do I/O | |
1440 | */ | |
1441 | if (wbc->nonblocking && bdi_write_congested(bdi)) { | |
1442 | wbc->encountered_congestion = 1; | |
9a0c8230 | 1443 | kfree(iov); |
37c0eb46 SF |
1444 | return 0; |
1445 | } | |
1446 | ||
1da177e4 LT |
1447 | xid = GetXid(); |
1448 | ||
37c0eb46 | 1449 | pagevec_init(&pvec, 0); |
111ebb6e | 1450 | if (wbc->range_cyclic) { |
37c0eb46 | 1451 | index = mapping->writeback_index; /* Start from prev offset */ |
111ebb6e OH |
1452 | end = -1; |
1453 | } else { | |
1454 | index = wbc->range_start >> PAGE_CACHE_SHIFT; | |
1455 | end = wbc->range_end >> PAGE_CACHE_SHIFT; | |
1456 | if (wbc->range_start == 0 && wbc->range_end == LLONG_MAX) | |
1457 | range_whole = 1; | |
37c0eb46 SF |
1458 | scanned = 1; |
1459 | } | |
1460 | retry: | |
1461 | while (!done && (index <= end) && | |
1462 | (nr_pages = pagevec_lookup_tag(&pvec, mapping, &index, | |
1463 | PAGECACHE_TAG_DIRTY, | |
1464 | min(end - index, (pgoff_t)PAGEVEC_SIZE - 1) + 1))) { | |
1465 | int first; | |
1466 | unsigned int i; | |
1467 | ||
37c0eb46 SF |
1468 | first = -1; |
1469 | next = 0; | |
1470 | n_iov = 0; | |
1471 | bytes_to_write = 0; | |
1472 | ||
1473 | for (i = 0; i < nr_pages; i++) { | |
1474 | page = pvec.pages[i]; | |
1475 | /* | |
1476 | * At this point we hold neither mapping->tree_lock nor | |
1477 | * lock on the page itself: the page may be truncated or | |
1478 | * invalidated (changing page->mapping to NULL), or even | |
1479 | * swizzled back from swapper_space to tmpfs file | |
1480 | * mapping | |
1481 | */ | |
1482 | ||
1483 | if (first < 0) | |
1484 | lock_page(page); | |
529ae9aa | 1485 | else if (!trylock_page(page)) |
37c0eb46 SF |
1486 | break; |
1487 | ||
1488 | if (unlikely(page->mapping != mapping)) { | |
1489 | unlock_page(page); | |
1490 | break; | |
1491 | } | |
1492 | ||
111ebb6e | 1493 | if (!wbc->range_cyclic && page->index > end) { |
37c0eb46 SF |
1494 | done = 1; |
1495 | unlock_page(page); | |
1496 | break; | |
1497 | } | |
1498 | ||
1499 | if (next && (page->index != next)) { | |
1500 | /* Not next consecutive page */ | |
1501 | unlock_page(page); | |
1502 | break; | |
1503 | } | |
1504 | ||
1505 | if (wbc->sync_mode != WB_SYNC_NONE) | |
1506 | wait_on_page_writeback(page); | |
1507 | ||
1508 | if (PageWriteback(page) || | |
cb876f45 | 1509 | !clear_page_dirty_for_io(page)) { |
37c0eb46 SF |
1510 | unlock_page(page); |
1511 | break; | |
1512 | } | |
84d2f07e | 1513 | |
cb876f45 LT |
1514 | /* |
1515 | * This actually clears the dirty bit in the radix tree. | |
1516 | * See cifs_writepage() for more commentary. | |
1517 | */ | |
1518 | set_page_writeback(page); | |
1519 | ||
84d2f07e SF |
1520 | if (page_offset(page) >= mapping->host->i_size) { |
1521 | done = 1; | |
1522 | unlock_page(page); | |
cb876f45 | 1523 | end_page_writeback(page); |
84d2f07e SF |
1524 | break; |
1525 | } | |
1526 | ||
37c0eb46 SF |
1527 | /* |
1528 | * BB can we get rid of this? pages are held by pvec | |
1529 | */ | |
1530 | page_cache_get(page); | |
1531 | ||
84d2f07e SF |
1532 | len = min(mapping->host->i_size - page_offset(page), |
1533 | (loff_t)PAGE_CACHE_SIZE); | |
1534 | ||
37c0eb46 SF |
1535 | /* reserve iov[0] for the smb header */ |
1536 | n_iov++; | |
1537 | iov[n_iov].iov_base = kmap(page); | |
84d2f07e SF |
1538 | iov[n_iov].iov_len = len; |
1539 | bytes_to_write += len; | |
37c0eb46 SF |
1540 | |
1541 | if (first < 0) { | |
1542 | first = i; | |
1543 | offset = page_offset(page); | |
1544 | } | |
1545 | next = page->index + 1; | |
1546 | if (bytes_to_write + PAGE_CACHE_SIZE > cifs_sb->wsize) | |
1547 | break; | |
1548 | } | |
1549 | if (n_iov) { | |
23e7dd7d SF |
1550 | /* Search for a writable handle every time we call |
1551 | * CIFSSMBWrite2. We can't rely on the last handle | |
1552 | * we used to still be valid | |
1553 | */ | |
1554 | open_file = find_writable_file(CIFS_I(mapping->host)); | |
1555 | if (!open_file) { | |
1556 | cERROR(1, ("No writable handles for inode")); | |
1557 | rc = -EBADF; | |
1047abc1 | 1558 | } else { |
fbec9ab9 | 1559 | long_op = cifs_write_timeout(cifsi, offset); |
23e7dd7d SF |
1560 | rc = CIFSSMBWrite2(xid, cifs_sb->tcon, |
1561 | open_file->netfid, | |
1562 | bytes_to_write, offset, | |
1563 | &bytes_written, iov, n_iov, | |
fbec9ab9 | 1564 | long_op); |
23e7dd7d | 1565 | atomic_dec(&open_file->wrtPending); |
fbec9ab9 JL |
1566 | cifs_update_eof(cifsi, offset, bytes_written); |
1567 | ||
23e7dd7d | 1568 | if (rc || bytes_written < bytes_to_write) { |
63135e08 | 1569 | cERROR(1, ("Write2 ret %d, wrote %d", |
23e7dd7d SF |
1570 | rc, bytes_written)); |
1571 | /* BB what if continued retry is | |
1572 | requested via mount flags? */ | |
cea21805 JL |
1573 | if (rc == -ENOSPC) |
1574 | set_bit(AS_ENOSPC, &mapping->flags); | |
1575 | else | |
1576 | set_bit(AS_EIO, &mapping->flags); | |
23e7dd7d SF |
1577 | } else { |
1578 | cifs_stats_bytes_written(cifs_sb->tcon, | |
1579 | bytes_written); | |
1580 | } | |
37c0eb46 SF |
1581 | } |
1582 | for (i = 0; i < n_iov; i++) { | |
1583 | page = pvec.pages[first + i]; | |
eb9bdaa3 SF |
1584 | /* Should we also set page error on |
1585 | success rc but too little data written? */ | |
1586 | /* BB investigate retry logic on temporary | |
1587 | server crash cases and how recovery works | |
fb8c4b14 SF |
1588 | when page marked as error */ |
1589 | if (rc) | |
eb9bdaa3 | 1590 | SetPageError(page); |
37c0eb46 SF |
1591 | kunmap(page); |
1592 | unlock_page(page); | |
cb876f45 | 1593 | end_page_writeback(page); |
37c0eb46 SF |
1594 | page_cache_release(page); |
1595 | } | |
1596 | if ((wbc->nr_to_write -= n_iov) <= 0) | |
1597 | done = 1; | |
1598 | index = next; | |
b066a48c DK |
1599 | } else |
1600 | /* Need to re-find the pages we skipped */ | |
1601 | index = pvec.pages[0]->index + 1; | |
1602 | ||
37c0eb46 SF |
1603 | pagevec_release(&pvec); |
1604 | } | |
1605 | if (!scanned && !done) { | |
1606 | /* | |
1607 | * We hit the last page and there is more work to be done: wrap | |
1608 | * back to the start of the file | |
1609 | */ | |
1610 | scanned = 1; | |
1611 | index = 0; | |
1612 | goto retry; | |
1613 | } | |
111ebb6e | 1614 | if (wbc->range_cyclic || (range_whole && wbc->nr_to_write > 0)) |
37c0eb46 SF |
1615 | mapping->writeback_index = index; |
1616 | ||
1da177e4 | 1617 | FreeXid(xid); |
9a0c8230 | 1618 | kfree(iov); |
1da177e4 LT |
1619 | return rc; |
1620 | } | |
1da177e4 | 1621 | |
fb8c4b14 | 1622 | static int cifs_writepage(struct page *page, struct writeback_control *wbc) |
1da177e4 LT |
1623 | { |
1624 | int rc = -EFAULT; | |
1625 | int xid; | |
1626 | ||
1627 | xid = GetXid(); | |
1628 | /* BB add check for wbc flags */ | |
1629 | page_cache_get(page); | |
ad7a2926 | 1630 | if (!PageUptodate(page)) |
1da177e4 | 1631 | cFYI(1, ("ppw - page not up to date")); |
cb876f45 LT |
1632 | |
1633 | /* | |
1634 | * Set the "writeback" flag, and clear "dirty" in the radix tree. | |
1635 | * | |
1636 | * A writepage() implementation always needs to do either this, | |
1637 | * or re-dirty the page with "redirty_page_for_writepage()" in | |
1638 | * the case of a failure. | |
1639 | * | |
1640 | * Just unlocking the page will cause the radix tree tag-bits | |
1641 | * to fail to update with the state of the page correctly. | |
1642 | */ | |
fb8c4b14 | 1643 | set_page_writeback(page); |
1da177e4 LT |
1644 | rc = cifs_partialpagewrite(page, 0, PAGE_CACHE_SIZE); |
1645 | SetPageUptodate(page); /* BB add check for error and Clearuptodate? */ | |
1646 | unlock_page(page); | |
cb876f45 LT |
1647 | end_page_writeback(page); |
1648 | page_cache_release(page); | |
1da177e4 LT |
1649 | FreeXid(xid); |
1650 | return rc; | |
1651 | } | |
1652 | ||
d9414774 NP |
1653 | static int cifs_write_end(struct file *file, struct address_space *mapping, |
1654 | loff_t pos, unsigned len, unsigned copied, | |
1655 | struct page *page, void *fsdata) | |
1da177e4 | 1656 | { |
d9414774 NP |
1657 | int rc; |
1658 | struct inode *inode = mapping->host; | |
1da177e4 | 1659 | |
d9414774 NP |
1660 | cFYI(1, ("write_end for page %p from pos %lld with %d bytes", |
1661 | page, pos, copied)); | |
1662 | ||
a98ee8c1 JL |
1663 | if (PageChecked(page)) { |
1664 | if (copied == len) | |
1665 | SetPageUptodate(page); | |
1666 | ClearPageChecked(page); | |
1667 | } else if (!PageUptodate(page) && copied == PAGE_CACHE_SIZE) | |
d9414774 | 1668 | SetPageUptodate(page); |
ad7a2926 | 1669 | |
1da177e4 | 1670 | if (!PageUptodate(page)) { |
d9414774 NP |
1671 | char *page_data; |
1672 | unsigned offset = pos & (PAGE_CACHE_SIZE - 1); | |
1673 | int xid; | |
1674 | ||
1675 | xid = GetXid(); | |
1da177e4 LT |
1676 | /* this is probably better than directly calling |
1677 | partialpage_write since in this function the file handle is | |
1678 | known which we might as well leverage */ | |
1679 | /* BB check if anything else missing out of ppw | |
1680 | such as updating last write time */ | |
1681 | page_data = kmap(page); | |
d9414774 NP |
1682 | rc = cifs_write(file, page_data + offset, copied, &pos); |
1683 | /* if (rc < 0) should we set writebehind rc? */ | |
1da177e4 | 1684 | kunmap(page); |
d9414774 NP |
1685 | |
1686 | FreeXid(xid); | |
fb8c4b14 | 1687 | } else { |
d9414774 NP |
1688 | rc = copied; |
1689 | pos += copied; | |
1da177e4 LT |
1690 | set_page_dirty(page); |
1691 | } | |
1692 | ||
d9414774 NP |
1693 | if (rc > 0) { |
1694 | spin_lock(&inode->i_lock); | |
1695 | if (pos > inode->i_size) | |
1696 | i_size_write(inode, pos); | |
1697 | spin_unlock(&inode->i_lock); | |
1698 | } | |
1699 | ||
1700 | unlock_page(page); | |
1701 | page_cache_release(page); | |
1702 | ||
1da177e4 LT |
1703 | return rc; |
1704 | } | |
1705 | ||
1706 | int cifs_fsync(struct file *file, struct dentry *dentry, int datasync) | |
1707 | { | |
1708 | int xid; | |
1709 | int rc = 0; | |
b298f223 SF |
1710 | struct cifsTconInfo *tcon; |
1711 | struct cifsFileInfo *smbfile = | |
1712 | (struct cifsFileInfo *)file->private_data; | |
e6a00296 | 1713 | struct inode *inode = file->f_path.dentry->d_inode; |
1da177e4 LT |
1714 | |
1715 | xid = GetXid(); | |
1716 | ||
fb8c4b14 | 1717 | cFYI(1, ("Sync file - name: %s datasync: 0x%x", |
1da177e4 | 1718 | dentry->d_name.name, datasync)); |
50c2f753 | 1719 | |
cea21805 JL |
1720 | rc = filemap_write_and_wait(inode->i_mapping); |
1721 | if (rc == 0) { | |
1722 | rc = CIFS_I(inode)->write_behind_rc; | |
1da177e4 | 1723 | CIFS_I(inode)->write_behind_rc = 0; |
b298f223 | 1724 | tcon = CIFS_SB(inode->i_sb)->tcon; |
be652445 | 1725 | if (!rc && tcon && smbfile && |
4717bed6 | 1726 | !(CIFS_SB(inode->i_sb)->mnt_cifs_flags & CIFS_MOUNT_NOSSYNC)) |
b298f223 | 1727 | rc = CIFSSMBFlush(xid, tcon, smbfile->netfid); |
cea21805 | 1728 | } |
b298f223 | 1729 | |
1da177e4 LT |
1730 | FreeXid(xid); |
1731 | return rc; | |
1732 | } | |
1733 | ||
3978d717 | 1734 | /* static void cifs_sync_page(struct page *page) |
1da177e4 LT |
1735 | { |
1736 | struct address_space *mapping; | |
1737 | struct inode *inode; | |
1738 | unsigned long index = page->index; | |
1739 | unsigned int rpages = 0; | |
1740 | int rc = 0; | |
1741 | ||
1742 | cFYI(1, ("sync page %p",page)); | |
1743 | mapping = page->mapping; | |
1744 | if (!mapping) | |
1745 | return 0; | |
1746 | inode = mapping->host; | |
1747 | if (!inode) | |
3978d717 | 1748 | return; */ |
1da177e4 | 1749 | |
fb8c4b14 | 1750 | /* fill in rpages then |
1da177e4 LT |
1751 | result = cifs_pagein_inode(inode, index, rpages); */ /* BB finish */ |
1752 | ||
26a21b98 | 1753 | /* cFYI(1, ("rpages is %d for sync page of Index %ld", rpages, index)); |
1da177e4 | 1754 | |
3978d717 | 1755 | #if 0 |
1da177e4 LT |
1756 | if (rc < 0) |
1757 | return rc; | |
1758 | return 0; | |
3978d717 | 1759 | #endif |
1da177e4 LT |
1760 | } */ |
1761 | ||
1762 | /* | |
1763 | * As file closes, flush all cached write data for this inode checking | |
1764 | * for write behind errors. | |
1765 | */ | |
75e1fcc0 | 1766 | int cifs_flush(struct file *file, fl_owner_t id) |
1da177e4 | 1767 | { |
fb8c4b14 | 1768 | struct inode *inode = file->f_path.dentry->d_inode; |
1da177e4 LT |
1769 | int rc = 0; |
1770 | ||
1771 | /* Rather than do the steps manually: | |
1772 | lock the inode for writing | |
1773 | loop through pages looking for write behind data (dirty pages) | |
1774 | coalesce into contiguous 16K (or smaller) chunks to write to server | |
1775 | send to server (prefer in parallel) | |
1776 | deal with writebehind errors | |
1777 | unlock inode for writing | |
1778 | filemapfdatawrite appears easier for the time being */ | |
1779 | ||
1780 | rc = filemap_fdatawrite(inode->i_mapping); | |
cea21805 JL |
1781 | /* reset wb rc if we were able to write out dirty pages */ |
1782 | if (!rc) { | |
1783 | rc = CIFS_I(inode)->write_behind_rc; | |
1da177e4 | 1784 | CIFS_I(inode)->write_behind_rc = 0; |
cea21805 | 1785 | } |
50c2f753 | 1786 | |
fb8c4b14 | 1787 | cFYI(1, ("Flush inode %p file %p rc %d", inode, file, rc)); |
1da177e4 LT |
1788 | |
1789 | return rc; | |
1790 | } | |
1791 | ||
1792 | ssize_t cifs_user_read(struct file *file, char __user *read_data, | |
1793 | size_t read_size, loff_t *poffset) | |
1794 | { | |
1795 | int rc = -EACCES; | |
1796 | unsigned int bytes_read = 0; | |
1797 | unsigned int total_read = 0; | |
1798 | unsigned int current_read_size; | |
1799 | struct cifs_sb_info *cifs_sb; | |
1800 | struct cifsTconInfo *pTcon; | |
1801 | int xid; | |
1802 | struct cifsFileInfo *open_file; | |
1803 | char *smb_read_data; | |
1804 | char __user *current_offset; | |
1805 | struct smb_com_read_rsp *pSMBr; | |
1806 | ||
1807 | xid = GetXid(); | |
e6a00296 | 1808 | cifs_sb = CIFS_SB(file->f_path.dentry->d_sb); |
1da177e4 LT |
1809 | pTcon = cifs_sb->tcon; |
1810 | ||
1811 | if (file->private_data == NULL) { | |
0f3bc09e | 1812 | rc = -EBADF; |
1da177e4 | 1813 | FreeXid(xid); |
0f3bc09e | 1814 | return rc; |
1da177e4 LT |
1815 | } |
1816 | open_file = (struct cifsFileInfo *)file->private_data; | |
1817 | ||
ad7a2926 | 1818 | if ((file->f_flags & O_ACCMODE) == O_WRONLY) |
1da177e4 | 1819 | cFYI(1, ("attempting read on write only file instance")); |
ad7a2926 | 1820 | |
1da177e4 LT |
1821 | for (total_read = 0, current_offset = read_data; |
1822 | read_size > total_read; | |
1823 | total_read += bytes_read, current_offset += bytes_read) { | |
fb8c4b14 | 1824 | current_read_size = min_t(const int, read_size - total_read, |
1da177e4 LT |
1825 | cifs_sb->rsize); |
1826 | rc = -EAGAIN; | |
1827 | smb_read_data = NULL; | |
1828 | while (rc == -EAGAIN) { | |
ec637e3f | 1829 | int buf_type = CIFS_NO_BUFFER; |
fb8c4b14 | 1830 | if ((open_file->invalidHandle) && |
1da177e4 | 1831 | (!open_file->closePend)) { |
4b18f2a9 | 1832 | rc = cifs_reopen_file(file, true); |
1da177e4 LT |
1833 | if (rc != 0) |
1834 | break; | |
1835 | } | |
bfa0d75a | 1836 | rc = CIFSSMBRead(xid, pTcon, |
ec637e3f SF |
1837 | open_file->netfid, |
1838 | current_read_size, *poffset, | |
1839 | &bytes_read, &smb_read_data, | |
1840 | &buf_type); | |
1da177e4 | 1841 | pSMBr = (struct smb_com_read_rsp *)smb_read_data; |
1da177e4 | 1842 | if (smb_read_data) { |
93544cc6 SF |
1843 | if (copy_to_user(current_offset, |
1844 | smb_read_data + | |
1845 | 4 /* RFC1001 length field */ + | |
1846 | le16_to_cpu(pSMBr->DataOffset), | |
ad7a2926 | 1847 | bytes_read)) |
93544cc6 | 1848 | rc = -EFAULT; |
93544cc6 | 1849 | |
fb8c4b14 | 1850 | if (buf_type == CIFS_SMALL_BUFFER) |
ec637e3f | 1851 | cifs_small_buf_release(smb_read_data); |
fb8c4b14 | 1852 | else if (buf_type == CIFS_LARGE_BUFFER) |
ec637e3f | 1853 | cifs_buf_release(smb_read_data); |
1da177e4 LT |
1854 | smb_read_data = NULL; |
1855 | } | |
1856 | } | |
1857 | if (rc || (bytes_read == 0)) { | |
1858 | if (total_read) { | |
1859 | break; | |
1860 | } else { | |
1861 | FreeXid(xid); | |
1862 | return rc; | |
1863 | } | |
1864 | } else { | |
a4544347 | 1865 | cifs_stats_bytes_read(pTcon, bytes_read); |
1da177e4 LT |
1866 | *poffset += bytes_read; |
1867 | } | |
1868 | } | |
1869 | FreeXid(xid); | |
1870 | return total_read; | |
1871 | } | |
1872 | ||
1873 | ||
1874 | static ssize_t cifs_read(struct file *file, char *read_data, size_t read_size, | |
1875 | loff_t *poffset) | |
1876 | { | |
1877 | int rc = -EACCES; | |
1878 | unsigned int bytes_read = 0; | |
1879 | unsigned int total_read; | |
1880 | unsigned int current_read_size; | |
1881 | struct cifs_sb_info *cifs_sb; | |
1882 | struct cifsTconInfo *pTcon; | |
1883 | int xid; | |
1884 | char *current_offset; | |
1885 | struct cifsFileInfo *open_file; | |
ec637e3f | 1886 | int buf_type = CIFS_NO_BUFFER; |
1da177e4 LT |
1887 | |
1888 | xid = GetXid(); | |
e6a00296 | 1889 | cifs_sb = CIFS_SB(file->f_path.dentry->d_sb); |
1da177e4 LT |
1890 | pTcon = cifs_sb->tcon; |
1891 | ||
1892 | if (file->private_data == NULL) { | |
0f3bc09e | 1893 | rc = -EBADF; |
1da177e4 | 1894 | FreeXid(xid); |
0f3bc09e | 1895 | return rc; |
1da177e4 LT |
1896 | } |
1897 | open_file = (struct cifsFileInfo *)file->private_data; | |
1898 | ||
1899 | if ((file->f_flags & O_ACCMODE) == O_WRONLY) | |
1900 | cFYI(1, ("attempting read on write only file instance")); | |
1901 | ||
fb8c4b14 | 1902 | for (total_read = 0, current_offset = read_data; |
1da177e4 LT |
1903 | read_size > total_read; |
1904 | total_read += bytes_read, current_offset += bytes_read) { | |
1905 | current_read_size = min_t(const int, read_size - total_read, | |
1906 | cifs_sb->rsize); | |
f9f5c817 SF |
1907 | /* For windows me and 9x we do not want to request more |
1908 | than it negotiated since it will refuse the read then */ | |
fb8c4b14 | 1909 | if ((pTcon->ses) && |
f9f5c817 SF |
1910 | !(pTcon->ses->capabilities & CAP_LARGE_FILES)) { |
1911 | current_read_size = min_t(const int, current_read_size, | |
1912 | pTcon->ses->server->maxBuf - 128); | |
1913 | } | |
1da177e4 LT |
1914 | rc = -EAGAIN; |
1915 | while (rc == -EAGAIN) { | |
fb8c4b14 | 1916 | if ((open_file->invalidHandle) && |
1da177e4 | 1917 | (!open_file->closePend)) { |
4b18f2a9 | 1918 | rc = cifs_reopen_file(file, true); |
1da177e4 LT |
1919 | if (rc != 0) |
1920 | break; | |
1921 | } | |
bfa0d75a | 1922 | rc = CIFSSMBRead(xid, pTcon, |
ec637e3f SF |
1923 | open_file->netfid, |
1924 | current_read_size, *poffset, | |
1925 | &bytes_read, ¤t_offset, | |
1926 | &buf_type); | |
1da177e4 LT |
1927 | } |
1928 | if (rc || (bytes_read == 0)) { | |
1929 | if (total_read) { | |
1930 | break; | |
1931 | } else { | |
1932 | FreeXid(xid); | |
1933 | return rc; | |
1934 | } | |
1935 | } else { | |
a4544347 | 1936 | cifs_stats_bytes_read(pTcon, total_read); |
1da177e4 LT |
1937 | *poffset += bytes_read; |
1938 | } | |
1939 | } | |
1940 | FreeXid(xid); | |
1941 | return total_read; | |
1942 | } | |
1943 | ||
1944 | int cifs_file_mmap(struct file *file, struct vm_area_struct *vma) | |
1945 | { | |
e6a00296 | 1946 | struct dentry *dentry = file->f_path.dentry; |
1da177e4 LT |
1947 | int rc, xid; |
1948 | ||
1949 | xid = GetXid(); | |
1950 | rc = cifs_revalidate(dentry); | |
1951 | if (rc) { | |
1952 | cFYI(1, ("Validation prior to mmap failed, error=%d", rc)); | |
1953 | FreeXid(xid); | |
1954 | return rc; | |
1955 | } | |
1956 | rc = generic_file_mmap(file, vma); | |
1957 | FreeXid(xid); | |
1958 | return rc; | |
1959 | } | |
1960 | ||
1961 | ||
fb8c4b14 | 1962 | static void cifs_copy_cache_pages(struct address_space *mapping, |
1da177e4 LT |
1963 | struct list_head *pages, int bytes_read, char *data, |
1964 | struct pagevec *plru_pvec) | |
1965 | { | |
1966 | struct page *page; | |
1967 | char *target; | |
1968 | ||
1969 | while (bytes_read > 0) { | |
1970 | if (list_empty(pages)) | |
1971 | break; | |
1972 | ||
1973 | page = list_entry(pages->prev, struct page, lru); | |
1974 | list_del(&page->lru); | |
1975 | ||
1976 | if (add_to_page_cache(page, mapping, page->index, | |
1977 | GFP_KERNEL)) { | |
1978 | page_cache_release(page); | |
1979 | cFYI(1, ("Add page cache failed")); | |
3079ca62 SF |
1980 | data += PAGE_CACHE_SIZE; |
1981 | bytes_read -= PAGE_CACHE_SIZE; | |
1da177e4 LT |
1982 | continue; |
1983 | } | |
1984 | ||
fb8c4b14 | 1985 | target = kmap_atomic(page, KM_USER0); |
1da177e4 LT |
1986 | |
1987 | if (PAGE_CACHE_SIZE > bytes_read) { | |
1988 | memcpy(target, data, bytes_read); | |
1989 | /* zero the tail end of this partial page */ | |
fb8c4b14 | 1990 | memset(target + bytes_read, 0, |
1da177e4 LT |
1991 | PAGE_CACHE_SIZE - bytes_read); |
1992 | bytes_read = 0; | |
1993 | } else { | |
1994 | memcpy(target, data, PAGE_CACHE_SIZE); | |
1995 | bytes_read -= PAGE_CACHE_SIZE; | |
1996 | } | |
1997 | kunmap_atomic(target, KM_USER0); | |
1998 | ||
1999 | flush_dcache_page(page); | |
2000 | SetPageUptodate(page); | |
2001 | unlock_page(page); | |
2002 | if (!pagevec_add(plru_pvec, page)) | |
4f98a2fe | 2003 | __pagevec_lru_add_file(plru_pvec); |
1da177e4 LT |
2004 | data += PAGE_CACHE_SIZE; |
2005 | } | |
2006 | return; | |
2007 | } | |
2008 | ||
2009 | static int cifs_readpages(struct file *file, struct address_space *mapping, | |
2010 | struct list_head *page_list, unsigned num_pages) | |
2011 | { | |
2012 | int rc = -EACCES; | |
2013 | int xid; | |
2014 | loff_t offset; | |
2015 | struct page *page; | |
2016 | struct cifs_sb_info *cifs_sb; | |
2017 | struct cifsTconInfo *pTcon; | |
2c2130e1 | 2018 | unsigned int bytes_read = 0; |
fb8c4b14 | 2019 | unsigned int read_size, i; |
1da177e4 LT |
2020 | char *smb_read_data = NULL; |
2021 | struct smb_com_read_rsp *pSMBr; | |
2022 | struct pagevec lru_pvec; | |
2023 | struct cifsFileInfo *open_file; | |
ec637e3f | 2024 | int buf_type = CIFS_NO_BUFFER; |
1da177e4 LT |
2025 | |
2026 | xid = GetXid(); | |
2027 | if (file->private_data == NULL) { | |
0f3bc09e | 2028 | rc = -EBADF; |
1da177e4 | 2029 | FreeXid(xid); |
0f3bc09e | 2030 | return rc; |
1da177e4 LT |
2031 | } |
2032 | open_file = (struct cifsFileInfo *)file->private_data; | |
e6a00296 | 2033 | cifs_sb = CIFS_SB(file->f_path.dentry->d_sb); |
1da177e4 | 2034 | pTcon = cifs_sb->tcon; |
bfa0d75a | 2035 | |
1da177e4 | 2036 | pagevec_init(&lru_pvec, 0); |
61de800d | 2037 | cFYI(DBG2, ("rpages: num pages %d", num_pages)); |
1da177e4 LT |
2038 | for (i = 0; i < num_pages; ) { |
2039 | unsigned contig_pages; | |
2040 | struct page *tmp_page; | |
2041 | unsigned long expected_index; | |
2042 | ||
2043 | if (list_empty(page_list)) | |
2044 | break; | |
2045 | ||
2046 | page = list_entry(page_list->prev, struct page, lru); | |
2047 | offset = (loff_t)page->index << PAGE_CACHE_SHIFT; | |
2048 | ||
2049 | /* count adjacent pages that we will read into */ | |
2050 | contig_pages = 0; | |
fb8c4b14 | 2051 | expected_index = |
1da177e4 | 2052 | list_entry(page_list->prev, struct page, lru)->index; |
fb8c4b14 | 2053 | list_for_each_entry_reverse(tmp_page, page_list, lru) { |
1da177e4 LT |
2054 | if (tmp_page->index == expected_index) { |
2055 | contig_pages++; | |
2056 | expected_index++; | |
2057 | } else | |
fb8c4b14 | 2058 | break; |
1da177e4 LT |
2059 | } |
2060 | if (contig_pages + i > num_pages) | |
2061 | contig_pages = num_pages - i; | |
2062 | ||
2063 | /* for reads over a certain size could initiate async | |
2064 | read ahead */ | |
2065 | ||
2066 | read_size = contig_pages * PAGE_CACHE_SIZE; | |
2067 | /* Read size needs to be in multiples of one page */ | |
2068 | read_size = min_t(const unsigned int, read_size, | |
2069 | cifs_sb->rsize & PAGE_CACHE_MASK); | |
90c81e0b | 2070 | cFYI(DBG2, ("rpages: read size 0x%x contiguous pages %d", |
75865f8c | 2071 | read_size, contig_pages)); |
1da177e4 LT |
2072 | rc = -EAGAIN; |
2073 | while (rc == -EAGAIN) { | |
fb8c4b14 | 2074 | if ((open_file->invalidHandle) && |
1da177e4 | 2075 | (!open_file->closePend)) { |
4b18f2a9 | 2076 | rc = cifs_reopen_file(file, true); |
1da177e4 LT |
2077 | if (rc != 0) |
2078 | break; | |
2079 | } | |
2080 | ||
bfa0d75a | 2081 | rc = CIFSSMBRead(xid, pTcon, |
ec637e3f SF |
2082 | open_file->netfid, |
2083 | read_size, offset, | |
2084 | &bytes_read, &smb_read_data, | |
2085 | &buf_type); | |
a9d02ad4 | 2086 | /* BB more RC checks ? */ |
fb8c4b14 | 2087 | if (rc == -EAGAIN) { |
1da177e4 | 2088 | if (smb_read_data) { |
fb8c4b14 | 2089 | if (buf_type == CIFS_SMALL_BUFFER) |
ec637e3f | 2090 | cifs_small_buf_release(smb_read_data); |
fb8c4b14 | 2091 | else if (buf_type == CIFS_LARGE_BUFFER) |
ec637e3f | 2092 | cifs_buf_release(smb_read_data); |
1da177e4 LT |
2093 | smb_read_data = NULL; |
2094 | } | |
2095 | } | |
2096 | } | |
2097 | if ((rc < 0) || (smb_read_data == NULL)) { | |
2098 | cFYI(1, ("Read error in readpages: %d", rc)); | |
1da177e4 LT |
2099 | break; |
2100 | } else if (bytes_read > 0) { | |
6f88cc2e | 2101 | task_io_account_read(bytes_read); |
1da177e4 LT |
2102 | pSMBr = (struct smb_com_read_rsp *)smb_read_data; |
2103 | cifs_copy_cache_pages(mapping, page_list, bytes_read, | |
2104 | smb_read_data + 4 /* RFC1001 hdr */ + | |
2105 | le16_to_cpu(pSMBr->DataOffset), &lru_pvec); | |
2106 | ||
2107 | i += bytes_read >> PAGE_CACHE_SHIFT; | |
a4544347 | 2108 | cifs_stats_bytes_read(pTcon, bytes_read); |
2c2130e1 | 2109 | if ((bytes_read & PAGE_CACHE_MASK) != bytes_read) { |
1da177e4 LT |
2110 | i++; /* account for partial page */ |
2111 | ||
fb8c4b14 | 2112 | /* server copy of file can have smaller size |
1da177e4 | 2113 | than client */ |
fb8c4b14 SF |
2114 | /* BB do we need to verify this common case ? |
2115 | this case is ok - if we are at server EOF | |
1da177e4 LT |
2116 | we will hit it on next read */ |
2117 | ||
05ac9d4b | 2118 | /* break; */ |
1da177e4 LT |
2119 | } |
2120 | } else { | |
2121 | cFYI(1, ("No bytes read (%d) at offset %lld . " | |
2122 | "Cleaning remaining pages from readahead list", | |
2123 | bytes_read, offset)); | |
fb8c4b14 | 2124 | /* BB turn off caching and do new lookup on |
1da177e4 | 2125 | file size at server? */ |
1da177e4 LT |
2126 | break; |
2127 | } | |
2128 | if (smb_read_data) { | |
fb8c4b14 | 2129 | if (buf_type == CIFS_SMALL_BUFFER) |
ec637e3f | 2130 | cifs_small_buf_release(smb_read_data); |
fb8c4b14 | 2131 | else if (buf_type == CIFS_LARGE_BUFFER) |
ec637e3f | 2132 | cifs_buf_release(smb_read_data); |
1da177e4 LT |
2133 | smb_read_data = NULL; |
2134 | } | |
2135 | bytes_read = 0; | |
2136 | } | |
2137 | ||
4f98a2fe | 2138 | pagevec_lru_add_file(&lru_pvec); |
1da177e4 LT |
2139 | |
2140 | /* need to free smb_read_data buf before exit */ | |
2141 | if (smb_read_data) { | |
fb8c4b14 | 2142 | if (buf_type == CIFS_SMALL_BUFFER) |
47c886b3 | 2143 | cifs_small_buf_release(smb_read_data); |
fb8c4b14 | 2144 | else if (buf_type == CIFS_LARGE_BUFFER) |
47c886b3 | 2145 | cifs_buf_release(smb_read_data); |
1da177e4 | 2146 | smb_read_data = NULL; |
fb8c4b14 | 2147 | } |
1da177e4 LT |
2148 | |
2149 | FreeXid(xid); | |
2150 | return rc; | |
2151 | } | |
2152 | ||
2153 | static int cifs_readpage_worker(struct file *file, struct page *page, | |
2154 | loff_t *poffset) | |
2155 | { | |
2156 | char *read_data; | |
2157 | int rc; | |
2158 | ||
2159 | page_cache_get(page); | |
2160 | read_data = kmap(page); | |
2161 | /* for reads over a certain size could initiate async read ahead */ | |
fb8c4b14 | 2162 | |
1da177e4 | 2163 | rc = cifs_read(file, read_data, PAGE_CACHE_SIZE, poffset); |
fb8c4b14 | 2164 | |
1da177e4 LT |
2165 | if (rc < 0) |
2166 | goto io_error; | |
2167 | else | |
fb8c4b14 SF |
2168 | cFYI(1, ("Bytes read %d", rc)); |
2169 | ||
e6a00296 JJS |
2170 | file->f_path.dentry->d_inode->i_atime = |
2171 | current_fs_time(file->f_path.dentry->d_inode->i_sb); | |
fb8c4b14 | 2172 | |
1da177e4 LT |
2173 | if (PAGE_CACHE_SIZE > rc) |
2174 | memset(read_data + rc, 0, PAGE_CACHE_SIZE - rc); | |
2175 | ||
2176 | flush_dcache_page(page); | |
2177 | SetPageUptodate(page); | |
2178 | rc = 0; | |
fb8c4b14 | 2179 | |
1da177e4 | 2180 | io_error: |
fb8c4b14 | 2181 | kunmap(page); |
1da177e4 LT |
2182 | page_cache_release(page); |
2183 | return rc; | |
2184 | } | |
2185 | ||
2186 | static int cifs_readpage(struct file *file, struct page *page) | |
2187 | { | |
2188 | loff_t offset = (loff_t)page->index << PAGE_CACHE_SHIFT; | |
2189 | int rc = -EACCES; | |
2190 | int xid; | |
2191 | ||
2192 | xid = GetXid(); | |
2193 | ||
2194 | if (file->private_data == NULL) { | |
0f3bc09e | 2195 | rc = -EBADF; |
1da177e4 | 2196 | FreeXid(xid); |
0f3bc09e | 2197 | return rc; |
1da177e4 LT |
2198 | } |
2199 | ||
fb8c4b14 | 2200 | cFYI(1, ("readpage %p at offset %d 0x%x\n", |
1da177e4 LT |
2201 | page, (int)offset, (int)offset)); |
2202 | ||
2203 | rc = cifs_readpage_worker(file, page, &offset); | |
2204 | ||
2205 | unlock_page(page); | |
2206 | ||
2207 | FreeXid(xid); | |
2208 | return rc; | |
2209 | } | |
2210 | ||
a403a0a3 SF |
2211 | static int is_inode_writable(struct cifsInodeInfo *cifs_inode) |
2212 | { | |
2213 | struct cifsFileInfo *open_file; | |
2214 | ||
2215 | read_lock(&GlobalSMBSeslock); | |
2216 | list_for_each_entry(open_file, &cifs_inode->openFileList, flist) { | |
2217 | if (open_file->closePend) | |
2218 | continue; | |
2219 | if (open_file->pfile && | |
2220 | ((open_file->pfile->f_flags & O_RDWR) || | |
2221 | (open_file->pfile->f_flags & O_WRONLY))) { | |
2222 | read_unlock(&GlobalSMBSeslock); | |
2223 | return 1; | |
2224 | } | |
2225 | } | |
2226 | read_unlock(&GlobalSMBSeslock); | |
2227 | return 0; | |
2228 | } | |
2229 | ||
1da177e4 LT |
2230 | /* We do not want to update the file size from server for inodes |
2231 | open for write - to avoid races with writepage extending | |
2232 | the file - in the future we could consider allowing | |
fb8c4b14 | 2233 | refreshing the inode only on increases in the file size |
1da177e4 LT |
2234 | but this is tricky to do without racing with writebehind |
2235 | page caching in the current Linux kernel design */ | |
4b18f2a9 | 2236 | bool is_size_safe_to_change(struct cifsInodeInfo *cifsInode, __u64 end_of_file) |
1da177e4 | 2237 | { |
a403a0a3 | 2238 | if (!cifsInode) |
4b18f2a9 | 2239 | return true; |
50c2f753 | 2240 | |
a403a0a3 SF |
2241 | if (is_inode_writable(cifsInode)) { |
2242 | /* This inode is open for write at least once */ | |
c32a0b68 SF |
2243 | struct cifs_sb_info *cifs_sb; |
2244 | ||
c32a0b68 | 2245 | cifs_sb = CIFS_SB(cifsInode->vfs_inode.i_sb); |
ad7a2926 | 2246 | if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DIRECT_IO) { |
fb8c4b14 | 2247 | /* since no page cache to corrupt on directio |
c32a0b68 | 2248 | we can change size safely */ |
4b18f2a9 | 2249 | return true; |
c32a0b68 SF |
2250 | } |
2251 | ||
fb8c4b14 | 2252 | if (i_size_read(&cifsInode->vfs_inode) < end_of_file) |
4b18f2a9 | 2253 | return true; |
7ba52631 | 2254 | |
4b18f2a9 | 2255 | return false; |
23e7dd7d | 2256 | } else |
4b18f2a9 | 2257 | return true; |
1da177e4 LT |
2258 | } |
2259 | ||
d9414774 NP |
2260 | static int cifs_write_begin(struct file *file, struct address_space *mapping, |
2261 | loff_t pos, unsigned len, unsigned flags, | |
2262 | struct page **pagep, void **fsdata) | |
1da177e4 | 2263 | { |
d9414774 NP |
2264 | pgoff_t index = pos >> PAGE_CACHE_SHIFT; |
2265 | loff_t offset = pos & (PAGE_CACHE_SIZE - 1); | |
a98ee8c1 JL |
2266 | loff_t page_start = pos & PAGE_MASK; |
2267 | loff_t i_size; | |
2268 | struct page *page; | |
2269 | int rc = 0; | |
d9414774 NP |
2270 | |
2271 | cFYI(1, ("write_begin from %lld len %d", (long long)pos, len)); | |
2272 | ||
54566b2c | 2273 | page = grab_cache_page_write_begin(mapping, index, flags); |
a98ee8c1 JL |
2274 | if (!page) { |
2275 | rc = -ENOMEM; | |
2276 | goto out; | |
2277 | } | |
8a236264 | 2278 | |
a98ee8c1 JL |
2279 | if (PageUptodate(page)) |
2280 | goto out; | |
8a236264 | 2281 | |
a98ee8c1 JL |
2282 | /* |
2283 | * If we write a full page it will be up to date, no need to read from | |
2284 | * the server. If the write is short, we'll end up doing a sync write | |
2285 | * instead. | |
2286 | */ | |
2287 | if (len == PAGE_CACHE_SIZE) | |
2288 | goto out; | |
8a236264 | 2289 | |
a98ee8c1 JL |
2290 | /* |
2291 | * optimize away the read when we have an oplock, and we're not | |
2292 | * expecting to use any of the data we'd be reading in. That | |
2293 | * is, when the page lies beyond the EOF, or straddles the EOF | |
2294 | * and the write will cover all of the existing data. | |
2295 | */ | |
2296 | if (CIFS_I(mapping->host)->clientCanCacheRead) { | |
2297 | i_size = i_size_read(mapping->host); | |
2298 | if (page_start >= i_size || | |
2299 | (offset == 0 && (pos + len) >= i_size)) { | |
2300 | zero_user_segments(page, 0, offset, | |
2301 | offset + len, | |
2302 | PAGE_CACHE_SIZE); | |
2303 | /* | |
2304 | * PageChecked means that the parts of the page | |
2305 | * to which we're not writing are considered up | |
2306 | * to date. Once the data is copied to the | |
2307 | * page, it can be set uptodate. | |
2308 | */ | |
2309 | SetPageChecked(page); | |
2310 | goto out; | |
2311 | } | |
2312 | } | |
d9414774 | 2313 | |
a98ee8c1 JL |
2314 | if ((file->f_flags & O_ACCMODE) != O_WRONLY) { |
2315 | /* | |
2316 | * might as well read a page, it is fast enough. If we get | |
2317 | * an error, we don't need to return it. cifs_write_end will | |
2318 | * do a sync write instead since PG_uptodate isn't set. | |
2319 | */ | |
2320 | cifs_readpage_worker(file, page, &page_start); | |
8a236264 SF |
2321 | } else { |
2322 | /* we could try using another file handle if there is one - | |
2323 | but how would we lock it to prevent close of that handle | |
2324 | racing with this read? In any case | |
d9414774 | 2325 | this will be written out by write_end so is fine */ |
1da177e4 | 2326 | } |
a98ee8c1 JL |
2327 | out: |
2328 | *pagep = page; | |
2329 | return rc; | |
1da177e4 LT |
2330 | } |
2331 | ||
f5e54d6e | 2332 | const struct address_space_operations cifs_addr_ops = { |
1da177e4 LT |
2333 | .readpage = cifs_readpage, |
2334 | .readpages = cifs_readpages, | |
2335 | .writepage = cifs_writepage, | |
37c0eb46 | 2336 | .writepages = cifs_writepages, |
d9414774 NP |
2337 | .write_begin = cifs_write_begin, |
2338 | .write_end = cifs_write_end, | |
1da177e4 LT |
2339 | .set_page_dirty = __set_page_dirty_nobuffers, |
2340 | /* .sync_page = cifs_sync_page, */ | |
2341 | /* .direct_IO = */ | |
2342 | }; | |
273d81d6 DK |
2343 | |
2344 | /* | |
2345 | * cifs_readpages requires the server to support a buffer large enough to | |
2346 | * contain the header plus one complete page of data. Otherwise, we need | |
2347 | * to leave cifs_readpages out of the address space operations. | |
2348 | */ | |
f5e54d6e | 2349 | const struct address_space_operations cifs_addr_ops_smallbuf = { |
273d81d6 DK |
2350 | .readpage = cifs_readpage, |
2351 | .writepage = cifs_writepage, | |
2352 | .writepages = cifs_writepages, | |
d9414774 NP |
2353 | .write_begin = cifs_write_begin, |
2354 | .write_end = cifs_write_end, | |
273d81d6 DK |
2355 | .set_page_dirty = __set_page_dirty_nobuffers, |
2356 | /* .sync_page = cifs_sync_page, */ | |
2357 | /* .direct_IO = */ | |
2358 | }; |