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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 | 5 | * |
f19159dc | 6 | * Copyright (C) International Business Machines Corp., 2002,2010 |
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> |
3bc303c2 | 33 | #include <linux/mount.h> |
5a0e3ad6 | 34 | #include <linux/slab.h> |
1da177e4 LT |
35 | #include <asm/div64.h> |
36 | #include "cifsfs.h" | |
37 | #include "cifspdu.h" | |
38 | #include "cifsglob.h" | |
39 | #include "cifsproto.h" | |
40 | #include "cifs_unicode.h" | |
41 | #include "cifs_debug.h" | |
42 | #include "cifs_fs_sb.h" | |
9451a9a5 | 43 | #include "fscache.h" |
1da177e4 | 44 | |
1da177e4 LT |
45 | static inline int cifs_convert_flags(unsigned int flags) |
46 | { | |
47 | if ((flags & O_ACCMODE) == O_RDONLY) | |
48 | return GENERIC_READ; | |
49 | else if ((flags & O_ACCMODE) == O_WRONLY) | |
50 | return GENERIC_WRITE; | |
51 | else if ((flags & O_ACCMODE) == O_RDWR) { | |
52 | /* GENERIC_ALL is too much permission to request | |
53 | can cause unnecessary access denied on create */ | |
54 | /* return GENERIC_ALL; */ | |
55 | return (GENERIC_READ | GENERIC_WRITE); | |
56 | } | |
57 | ||
e10f7b55 JL |
58 | return (READ_CONTROL | FILE_WRITE_ATTRIBUTES | FILE_READ_ATTRIBUTES | |
59 | FILE_WRITE_EA | FILE_APPEND_DATA | FILE_WRITE_DATA | | |
60 | FILE_READ_DATA); | |
7fc8f4e9 | 61 | } |
e10f7b55 | 62 | |
608712fe | 63 | static u32 cifs_posix_convert_flags(unsigned int flags) |
7fc8f4e9 | 64 | { |
608712fe | 65 | u32 posix_flags = 0; |
e10f7b55 | 66 | |
7fc8f4e9 | 67 | if ((flags & O_ACCMODE) == O_RDONLY) |
608712fe | 68 | posix_flags = SMB_O_RDONLY; |
7fc8f4e9 | 69 | else if ((flags & O_ACCMODE) == O_WRONLY) |
608712fe JL |
70 | posix_flags = SMB_O_WRONLY; |
71 | else if ((flags & O_ACCMODE) == O_RDWR) | |
72 | posix_flags = SMB_O_RDWR; | |
73 | ||
74 | if (flags & O_CREAT) | |
75 | posix_flags |= SMB_O_CREAT; | |
76 | if (flags & O_EXCL) | |
77 | posix_flags |= SMB_O_EXCL; | |
78 | if (flags & O_TRUNC) | |
79 | posix_flags |= SMB_O_TRUNC; | |
80 | /* be safe and imply O_SYNC for O_DSYNC */ | |
6b2f3d1f | 81 | if (flags & O_DSYNC) |
608712fe | 82 | posix_flags |= SMB_O_SYNC; |
7fc8f4e9 | 83 | if (flags & O_DIRECTORY) |
608712fe | 84 | posix_flags |= SMB_O_DIRECTORY; |
7fc8f4e9 | 85 | if (flags & O_NOFOLLOW) |
608712fe | 86 | posix_flags |= SMB_O_NOFOLLOW; |
7fc8f4e9 | 87 | if (flags & O_DIRECT) |
608712fe | 88 | posix_flags |= SMB_O_DIRECT; |
7fc8f4e9 SF |
89 | |
90 | return posix_flags; | |
1da177e4 LT |
91 | } |
92 | ||
93 | static inline int cifs_get_disposition(unsigned int flags) | |
94 | { | |
95 | if ((flags & (O_CREAT | O_EXCL)) == (O_CREAT | O_EXCL)) | |
96 | return FILE_CREATE; | |
97 | else if ((flags & (O_CREAT | O_TRUNC)) == (O_CREAT | O_TRUNC)) | |
98 | return FILE_OVERWRITE_IF; | |
99 | else if ((flags & O_CREAT) == O_CREAT) | |
100 | return FILE_OPEN_IF; | |
55aa2e09 SF |
101 | else if ((flags & O_TRUNC) == O_TRUNC) |
102 | return FILE_OVERWRITE; | |
1da177e4 LT |
103 | else |
104 | return FILE_OPEN; | |
105 | } | |
106 | ||
608712fe JL |
107 | int cifs_posix_open(char *full_path, struct inode **pinode, |
108 | struct super_block *sb, int mode, unsigned int f_flags, | |
109 | __u32 *poplock, __u16 *pnetfid, int xid) | |
110 | { | |
111 | int rc; | |
112 | FILE_UNIX_BASIC_INFO *presp_data; | |
113 | __u32 posix_flags = 0; | |
114 | struct cifs_sb_info *cifs_sb = CIFS_SB(sb); | |
115 | struct cifs_fattr fattr; | |
116 | struct tcon_link *tlink; | |
117 | struct cifsTconInfo *tcon; | |
118 | ||
119 | cFYI(1, "posix open %s", full_path); | |
120 | ||
121 | presp_data = kzalloc(sizeof(FILE_UNIX_BASIC_INFO), GFP_KERNEL); | |
122 | if (presp_data == NULL) | |
123 | return -ENOMEM; | |
124 | ||
125 | tlink = cifs_sb_tlink(cifs_sb); | |
126 | if (IS_ERR(tlink)) { | |
127 | rc = PTR_ERR(tlink); | |
128 | goto posix_open_ret; | |
129 | } | |
130 | ||
131 | tcon = tlink_tcon(tlink); | |
132 | mode &= ~current_umask(); | |
133 | ||
134 | posix_flags = cifs_posix_convert_flags(f_flags); | |
135 | rc = CIFSPOSIXCreate(xid, tcon, posix_flags, mode, pnetfid, presp_data, | |
136 | poplock, full_path, cifs_sb->local_nls, | |
137 | cifs_sb->mnt_cifs_flags & | |
138 | CIFS_MOUNT_MAP_SPECIAL_CHR); | |
139 | cifs_put_tlink(tlink); | |
140 | ||
141 | if (rc) | |
142 | goto posix_open_ret; | |
143 | ||
144 | if (presp_data->Type == cpu_to_le32(-1)) | |
145 | goto posix_open_ret; /* open ok, caller does qpathinfo */ | |
146 | ||
147 | if (!pinode) | |
148 | goto posix_open_ret; /* caller does not need info */ | |
149 | ||
150 | cifs_unix_basic_to_fattr(&fattr, presp_data, cifs_sb); | |
151 | ||
152 | /* get new inode and set it up */ | |
153 | if (*pinode == NULL) { | |
154 | cifs_fill_uniqueid(sb, &fattr); | |
155 | *pinode = cifs_iget(sb, &fattr); | |
156 | if (!*pinode) { | |
157 | rc = -ENOMEM; | |
158 | goto posix_open_ret; | |
159 | } | |
160 | } else { | |
161 | cifs_fattr_to_inode(*pinode, &fattr); | |
162 | } | |
163 | ||
164 | posix_open_ret: | |
165 | kfree(presp_data); | |
166 | return rc; | |
167 | } | |
168 | ||
eeb910a6 PS |
169 | static int |
170 | cifs_nt_open(char *full_path, struct inode *inode, struct cifs_sb_info *cifs_sb, | |
171 | struct cifsTconInfo *tcon, unsigned int f_flags, __u32 *poplock, | |
172 | __u16 *pnetfid, int xid) | |
173 | { | |
174 | int rc; | |
175 | int desiredAccess; | |
176 | int disposition; | |
177 | FILE_ALL_INFO *buf; | |
178 | ||
179 | desiredAccess = cifs_convert_flags(f_flags); | |
180 | ||
181 | /********************************************************************* | |
182 | * open flag mapping table: | |
183 | * | |
184 | * POSIX Flag CIFS Disposition | |
185 | * ---------- ---------------- | |
186 | * O_CREAT FILE_OPEN_IF | |
187 | * O_CREAT | O_EXCL FILE_CREATE | |
188 | * O_CREAT | O_TRUNC FILE_OVERWRITE_IF | |
189 | * O_TRUNC FILE_OVERWRITE | |
190 | * none of the above FILE_OPEN | |
191 | * | |
192 | * Note that there is not a direct match between disposition | |
193 | * FILE_SUPERSEDE (ie create whether or not file exists although | |
194 | * O_CREAT | O_TRUNC is similar but truncates the existing | |
195 | * file rather than creating a new file as FILE_SUPERSEDE does | |
196 | * (which uses the attributes / metadata passed in on open call) | |
197 | *? | |
198 | *? O_SYNC is a reasonable match to CIFS writethrough flag | |
199 | *? and the read write flags match reasonably. O_LARGEFILE | |
200 | *? is irrelevant because largefile support is always used | |
201 | *? by this client. Flags O_APPEND, O_DIRECT, O_DIRECTORY, | |
202 | * O_FASYNC, O_NOFOLLOW, O_NONBLOCK need further investigation | |
203 | *********************************************************************/ | |
204 | ||
205 | disposition = cifs_get_disposition(f_flags); | |
206 | ||
207 | /* BB pass O_SYNC flag through on file attributes .. BB */ | |
208 | ||
209 | buf = kmalloc(sizeof(FILE_ALL_INFO), GFP_KERNEL); | |
210 | if (!buf) | |
211 | return -ENOMEM; | |
212 | ||
213 | if (tcon->ses->capabilities & CAP_NT_SMBS) | |
214 | rc = CIFSSMBOpen(xid, tcon, full_path, disposition, | |
215 | desiredAccess, CREATE_NOT_DIR, pnetfid, poplock, buf, | |
216 | cifs_sb->local_nls, cifs_sb->mnt_cifs_flags | |
217 | & CIFS_MOUNT_MAP_SPECIAL_CHR); | |
218 | else | |
219 | rc = SMBLegacyOpen(xid, tcon, full_path, disposition, | |
220 | desiredAccess, CREATE_NOT_DIR, pnetfid, poplock, buf, | |
221 | cifs_sb->local_nls, cifs_sb->mnt_cifs_flags | |
222 | & CIFS_MOUNT_MAP_SPECIAL_CHR); | |
223 | ||
224 | if (rc) | |
225 | goto out; | |
226 | ||
227 | if (tcon->unix_ext) | |
228 | rc = cifs_get_inode_info_unix(&inode, full_path, inode->i_sb, | |
229 | xid); | |
230 | else | |
231 | rc = cifs_get_inode_info(&inode, full_path, buf, inode->i_sb, | |
232 | xid, pnetfid); | |
233 | ||
234 | out: | |
235 | kfree(buf); | |
236 | return rc; | |
237 | } | |
238 | ||
15ecb436 JL |
239 | struct cifsFileInfo * |
240 | cifs_new_fileinfo(__u16 fileHandle, struct file *file, | |
241 | struct tcon_link *tlink, __u32 oplock) | |
242 | { | |
243 | struct dentry *dentry = file->f_path.dentry; | |
244 | struct inode *inode = dentry->d_inode; | |
245 | struct cifsInodeInfo *pCifsInode = CIFS_I(inode); | |
246 | struct cifsFileInfo *pCifsFile; | |
247 | ||
248 | pCifsFile = kzalloc(sizeof(struct cifsFileInfo), GFP_KERNEL); | |
249 | if (pCifsFile == NULL) | |
250 | return pCifsFile; | |
251 | ||
5f6dbc9e | 252 | pCifsFile->count = 1; |
15ecb436 JL |
253 | pCifsFile->netfid = fileHandle; |
254 | pCifsFile->pid = current->tgid; | |
255 | pCifsFile->uid = current_fsuid(); | |
256 | pCifsFile->dentry = dget(dentry); | |
257 | pCifsFile->f_flags = file->f_flags; | |
258 | pCifsFile->invalidHandle = false; | |
15ecb436 JL |
259 | pCifsFile->tlink = cifs_get_tlink(tlink); |
260 | mutex_init(&pCifsFile->fh_mutex); | |
261 | mutex_init(&pCifsFile->lock_mutex); | |
262 | INIT_LIST_HEAD(&pCifsFile->llist); | |
15ecb436 JL |
263 | INIT_WORK(&pCifsFile->oplock_break, cifs_oplock_break); |
264 | ||
4477288a | 265 | spin_lock(&cifs_file_list_lock); |
15ecb436 JL |
266 | list_add(&pCifsFile->tlist, &(tlink_tcon(tlink)->openFileList)); |
267 | /* if readable file instance put first in list*/ | |
268 | if (file->f_mode & FMODE_READ) | |
269 | list_add(&pCifsFile->flist, &pCifsInode->openFileList); | |
270 | else | |
271 | list_add_tail(&pCifsFile->flist, &pCifsInode->openFileList); | |
4477288a | 272 | spin_unlock(&cifs_file_list_lock); |
15ecb436 | 273 | |
c6723628 | 274 | cifs_set_oplock_level(pCifsInode, oplock); |
15ecb436 JL |
275 | |
276 | file->private_data = pCifsFile; | |
277 | return pCifsFile; | |
278 | } | |
279 | ||
cdff08e7 SF |
280 | /* |
281 | * Release a reference on the file private data. This may involve closing | |
5f6dbc9e JL |
282 | * the filehandle out on the server. Must be called without holding |
283 | * cifs_file_list_lock. | |
cdff08e7 | 284 | */ |
b33879aa JL |
285 | void cifsFileInfo_put(struct cifsFileInfo *cifs_file) |
286 | { | |
e66673e3 | 287 | struct inode *inode = cifs_file->dentry->d_inode; |
cdff08e7 | 288 | struct cifsTconInfo *tcon = tlink_tcon(cifs_file->tlink); |
e66673e3 | 289 | struct cifsInodeInfo *cifsi = CIFS_I(inode); |
4f8ba8a0 | 290 | struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb); |
cdff08e7 SF |
291 | struct cifsLockInfo *li, *tmp; |
292 | ||
293 | spin_lock(&cifs_file_list_lock); | |
5f6dbc9e | 294 | if (--cifs_file->count > 0) { |
cdff08e7 SF |
295 | spin_unlock(&cifs_file_list_lock); |
296 | return; | |
297 | } | |
298 | ||
299 | /* remove it from the lists */ | |
300 | list_del(&cifs_file->flist); | |
301 | list_del(&cifs_file->tlist); | |
302 | ||
303 | if (list_empty(&cifsi->openFileList)) { | |
304 | cFYI(1, "closing last open instance for inode %p", | |
305 | cifs_file->dentry->d_inode); | |
4f8ba8a0 PS |
306 | |
307 | /* in strict cache mode we need invalidate mapping on the last | |
308 | close because it may cause a error when we open this file | |
309 | again and get at least level II oplock */ | |
310 | if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_STRICT_IO) | |
311 | CIFS_I(inode)->invalid_mapping = true; | |
312 | ||
c6723628 | 313 | cifs_set_oplock_level(cifsi, 0); |
cdff08e7 SF |
314 | } |
315 | spin_unlock(&cifs_file_list_lock); | |
316 | ||
317 | if (!tcon->need_reconnect && !cifs_file->invalidHandle) { | |
318 | int xid, rc; | |
319 | ||
320 | xid = GetXid(); | |
321 | rc = CIFSSMBClose(xid, tcon, cifs_file->netfid); | |
322 | FreeXid(xid); | |
323 | } | |
324 | ||
325 | /* Delete any outstanding lock records. We'll lose them when the file | |
326 | * is closed anyway. | |
327 | */ | |
328 | mutex_lock(&cifs_file->lock_mutex); | |
329 | list_for_each_entry_safe(li, tmp, &cifs_file->llist, llist) { | |
330 | list_del(&li->llist); | |
331 | kfree(li); | |
b33879aa | 332 | } |
cdff08e7 SF |
333 | mutex_unlock(&cifs_file->lock_mutex); |
334 | ||
335 | cifs_put_tlink(cifs_file->tlink); | |
336 | dput(cifs_file->dentry); | |
337 | kfree(cifs_file); | |
b33879aa JL |
338 | } |
339 | ||
1da177e4 LT |
340 | int cifs_open(struct inode *inode, struct file *file) |
341 | { | |
342 | int rc = -EACCES; | |
590a3fe0 JL |
343 | int xid; |
344 | __u32 oplock; | |
1da177e4 | 345 | struct cifs_sb_info *cifs_sb; |
276a74a4 | 346 | struct cifsTconInfo *tcon; |
7ffec372 | 347 | struct tcon_link *tlink; |
6ca9f3ba | 348 | struct cifsFileInfo *pCifsFile = NULL; |
1da177e4 | 349 | char *full_path = NULL; |
7e12eddb | 350 | bool posix_open_ok = false; |
1da177e4 | 351 | __u16 netfid; |
1da177e4 LT |
352 | |
353 | xid = GetXid(); | |
354 | ||
355 | cifs_sb = CIFS_SB(inode->i_sb); | |
7ffec372 JL |
356 | tlink = cifs_sb_tlink(cifs_sb); |
357 | if (IS_ERR(tlink)) { | |
358 | FreeXid(xid); | |
359 | return PTR_ERR(tlink); | |
360 | } | |
361 | tcon = tlink_tcon(tlink); | |
1da177e4 | 362 | |
e6a00296 | 363 | full_path = build_path_from_dentry(file->f_path.dentry); |
1da177e4 | 364 | if (full_path == NULL) { |
0f3bc09e | 365 | rc = -ENOMEM; |
232341ba | 366 | goto out; |
1da177e4 LT |
367 | } |
368 | ||
b6b38f70 JP |
369 | cFYI(1, "inode = 0x%p file flags are 0x%x for %s", |
370 | inode, file->f_flags, full_path); | |
276a74a4 SF |
371 | |
372 | if (oplockEnabled) | |
373 | oplock = REQ_OPLOCK; | |
374 | else | |
375 | oplock = 0; | |
376 | ||
64cc2c63 SF |
377 | if (!tcon->broken_posix_open && tcon->unix_ext && |
378 | (tcon->ses->capabilities & CAP_UNIX) && | |
276a74a4 SF |
379 | (CIFS_UNIX_POSIX_PATH_OPS_CAP & |
380 | le64_to_cpu(tcon->fsUnixInfo.Capability))) { | |
276a74a4 | 381 | /* can not refresh inode info since size could be stale */ |
2422f676 | 382 | rc = cifs_posix_open(full_path, &inode, inode->i_sb, |
fa588e0c | 383 | cifs_sb->mnt_file_mode /* ignored */, |
608712fe | 384 | file->f_flags, &oplock, &netfid, xid); |
276a74a4 | 385 | if (rc == 0) { |
b6b38f70 | 386 | cFYI(1, "posix open succeeded"); |
7e12eddb | 387 | posix_open_ok = true; |
64cc2c63 SF |
388 | } else if ((rc == -EINVAL) || (rc == -EOPNOTSUPP)) { |
389 | if (tcon->ses->serverNOS) | |
b6b38f70 | 390 | cERROR(1, "server %s of type %s returned" |
64cc2c63 SF |
391 | " unexpected error on SMB posix open" |
392 | ", disabling posix open support." | |
393 | " Check if server update available.", | |
394 | tcon->ses->serverName, | |
b6b38f70 | 395 | tcon->ses->serverNOS); |
64cc2c63 | 396 | tcon->broken_posix_open = true; |
276a74a4 SF |
397 | } else if ((rc != -EIO) && (rc != -EREMOTE) && |
398 | (rc != -EOPNOTSUPP)) /* path not found or net err */ | |
399 | goto out; | |
64cc2c63 SF |
400 | /* else fallthrough to retry open the old way on network i/o |
401 | or DFS errors */ | |
276a74a4 SF |
402 | } |
403 | ||
7e12eddb PS |
404 | if (!posix_open_ok) { |
405 | rc = cifs_nt_open(full_path, inode, cifs_sb, tcon, | |
406 | file->f_flags, &oplock, &netfid, xid); | |
407 | if (rc) | |
408 | goto out; | |
409 | } | |
47c78b7f | 410 | |
abfe1eed | 411 | pCifsFile = cifs_new_fileinfo(netfid, file, tlink, oplock); |
6ca9f3ba | 412 | if (pCifsFile == NULL) { |
7e12eddb | 413 | CIFSSMBClose(xid, tcon, netfid); |
1da177e4 LT |
414 | rc = -ENOMEM; |
415 | goto out; | |
416 | } | |
1da177e4 | 417 | |
9451a9a5 SJ |
418 | cifs_fscache_set_inode_cookie(inode, file); |
419 | ||
7e12eddb | 420 | if ((oplock & CIFS_CREATE_ACTION) && !posix_open_ok && tcon->unix_ext) { |
1da177e4 LT |
421 | /* time to set mode which we can not set earlier due to |
422 | problems creating new read-only files */ | |
7e12eddb PS |
423 | struct cifs_unix_set_info_args args = { |
424 | .mode = inode->i_mode, | |
425 | .uid = NO_CHANGE_64, | |
426 | .gid = NO_CHANGE_64, | |
427 | .ctime = NO_CHANGE_64, | |
428 | .atime = NO_CHANGE_64, | |
429 | .mtime = NO_CHANGE_64, | |
430 | .device = 0, | |
431 | }; | |
d44a9fe2 JL |
432 | CIFSSMBUnixSetFileInfo(xid, tcon, &args, netfid, |
433 | pCifsFile->pid); | |
1da177e4 LT |
434 | } |
435 | ||
436 | out: | |
1da177e4 LT |
437 | kfree(full_path); |
438 | FreeXid(xid); | |
7ffec372 | 439 | cifs_put_tlink(tlink); |
1da177e4 LT |
440 | return rc; |
441 | } | |
442 | ||
0418726b | 443 | /* Try to reacquire byte range locks that were released when session */ |
1da177e4 LT |
444 | /* to server was lost */ |
445 | static int cifs_relock_file(struct cifsFileInfo *cifsFile) | |
446 | { | |
447 | int rc = 0; | |
448 | ||
449 | /* BB list all locks open on this file and relock */ | |
450 | ||
451 | return rc; | |
452 | } | |
453 | ||
15886177 | 454 | static int cifs_reopen_file(struct cifsFileInfo *pCifsFile, bool can_flush) |
1da177e4 LT |
455 | { |
456 | int rc = -EACCES; | |
590a3fe0 JL |
457 | int xid; |
458 | __u32 oplock; | |
1da177e4 | 459 | struct cifs_sb_info *cifs_sb; |
7fc8f4e9 | 460 | struct cifsTconInfo *tcon; |
1da177e4 | 461 | struct cifsInodeInfo *pCifsInode; |
fb8c4b14 | 462 | struct inode *inode; |
1da177e4 LT |
463 | char *full_path = NULL; |
464 | int desiredAccess; | |
465 | int disposition = FILE_OPEN; | |
466 | __u16 netfid; | |
467 | ||
1da177e4 | 468 | xid = GetXid(); |
f0a71eb8 | 469 | mutex_lock(&pCifsFile->fh_mutex); |
4b18f2a9 | 470 | if (!pCifsFile->invalidHandle) { |
f0a71eb8 | 471 | mutex_unlock(&pCifsFile->fh_mutex); |
0f3bc09e | 472 | rc = 0; |
1da177e4 | 473 | FreeXid(xid); |
0f3bc09e | 474 | return rc; |
1da177e4 LT |
475 | } |
476 | ||
15886177 | 477 | inode = pCifsFile->dentry->d_inode; |
1da177e4 | 478 | cifs_sb = CIFS_SB(inode->i_sb); |
13cfb733 | 479 | tcon = tlink_tcon(pCifsFile->tlink); |
3a9f462f | 480 | |
1da177e4 LT |
481 | /* can not grab rename sem here because various ops, including |
482 | those that already have the rename sem can end up causing writepage | |
483 | to get called and if the server was down that means we end up here, | |
484 | and we can never tell if the caller already has the rename_sem */ | |
15886177 | 485 | full_path = build_path_from_dentry(pCifsFile->dentry); |
1da177e4 | 486 | if (full_path == NULL) { |
3a9f462f | 487 | rc = -ENOMEM; |
f0a71eb8 | 488 | mutex_unlock(&pCifsFile->fh_mutex); |
1da177e4 | 489 | FreeXid(xid); |
3a9f462f | 490 | return rc; |
1da177e4 LT |
491 | } |
492 | ||
b6b38f70 | 493 | cFYI(1, "inode = 0x%p file flags 0x%x for %s", |
15886177 | 494 | inode, pCifsFile->f_flags, full_path); |
1da177e4 LT |
495 | |
496 | if (oplockEnabled) | |
497 | oplock = REQ_OPLOCK; | |
498 | else | |
4b18f2a9 | 499 | oplock = 0; |
1da177e4 | 500 | |
7fc8f4e9 SF |
501 | if (tcon->unix_ext && (tcon->ses->capabilities & CAP_UNIX) && |
502 | (CIFS_UNIX_POSIX_PATH_OPS_CAP & | |
503 | le64_to_cpu(tcon->fsUnixInfo.Capability))) { | |
608712fe JL |
504 | |
505 | /* | |
506 | * O_CREAT, O_EXCL and O_TRUNC already had their effect on the | |
507 | * original open. Must mask them off for a reopen. | |
508 | */ | |
15886177 JL |
509 | unsigned int oflags = pCifsFile->f_flags & |
510 | ~(O_CREAT | O_EXCL | O_TRUNC); | |
608712fe | 511 | |
2422f676 | 512 | rc = cifs_posix_open(full_path, NULL, inode->i_sb, |
fa588e0c SF |
513 | cifs_sb->mnt_file_mode /* ignored */, |
514 | oflags, &oplock, &netfid, xid); | |
7fc8f4e9 | 515 | if (rc == 0) { |
b6b38f70 | 516 | cFYI(1, "posix reopen succeeded"); |
7fc8f4e9 SF |
517 | goto reopen_success; |
518 | } | |
519 | /* fallthrough to retry open the old way on errors, especially | |
520 | in the reconnect path it is important to retry hard */ | |
521 | } | |
522 | ||
15886177 | 523 | desiredAccess = cifs_convert_flags(pCifsFile->f_flags); |
7fc8f4e9 | 524 | |
1da177e4 | 525 | /* Can not refresh inode by passing in file_info buf to be returned |
fb8c4b14 SF |
526 | by SMBOpen and then calling get_inode_info with returned buf |
527 | since file might have write behind data that needs to be flushed | |
1da177e4 LT |
528 | and server version of file size can be stale. If we knew for sure |
529 | that inode was not dirty locally we could do this */ | |
530 | ||
7fc8f4e9 | 531 | rc = CIFSSMBOpen(xid, tcon, full_path, disposition, desiredAccess, |
1da177e4 | 532 | CREATE_NOT_DIR, &netfid, &oplock, NULL, |
fb8c4b14 | 533 | cifs_sb->local_nls, cifs_sb->mnt_cifs_flags & |
737b758c | 534 | CIFS_MOUNT_MAP_SPECIAL_CHR); |
1da177e4 | 535 | if (rc) { |
f0a71eb8 | 536 | mutex_unlock(&pCifsFile->fh_mutex); |
b6b38f70 JP |
537 | cFYI(1, "cifs_open returned 0x%x", rc); |
538 | cFYI(1, "oplock: %d", oplock); | |
15886177 JL |
539 | goto reopen_error_exit; |
540 | } | |
541 | ||
7fc8f4e9 | 542 | reopen_success: |
15886177 JL |
543 | pCifsFile->netfid = netfid; |
544 | pCifsFile->invalidHandle = false; | |
545 | mutex_unlock(&pCifsFile->fh_mutex); | |
546 | pCifsInode = CIFS_I(inode); | |
547 | ||
548 | if (can_flush) { | |
549 | rc = filemap_write_and_wait(inode->i_mapping); | |
eb4b756b | 550 | mapping_set_error(inode->i_mapping, rc); |
15886177 | 551 | |
15886177 JL |
552 | if (tcon->unix_ext) |
553 | rc = cifs_get_inode_info_unix(&inode, | |
554 | full_path, inode->i_sb, xid); | |
555 | else | |
556 | rc = cifs_get_inode_info(&inode, | |
557 | full_path, NULL, inode->i_sb, | |
558 | xid, NULL); | |
559 | } /* else we are writing out data to server already | |
560 | and could deadlock if we tried to flush data, and | |
561 | since we do not know if we have data that would | |
562 | invalidate the current end of file on the server | |
563 | we can not go to the server to get the new inod | |
564 | info */ | |
e66673e3 | 565 | |
c6723628 | 566 | cifs_set_oplock_level(pCifsInode, oplock); |
e66673e3 | 567 | |
15886177 JL |
568 | cifs_relock_file(pCifsFile); |
569 | ||
570 | reopen_error_exit: | |
1da177e4 LT |
571 | kfree(full_path); |
572 | FreeXid(xid); | |
573 | return rc; | |
574 | } | |
575 | ||
576 | int cifs_close(struct inode *inode, struct file *file) | |
577 | { | |
cdff08e7 SF |
578 | cifsFileInfo_put(file->private_data); |
579 | file->private_data = NULL; | |
7ee1af76 | 580 | |
cdff08e7 SF |
581 | /* return code from the ->release op is always ignored */ |
582 | return 0; | |
1da177e4 LT |
583 | } |
584 | ||
585 | int cifs_closedir(struct inode *inode, struct file *file) | |
586 | { | |
587 | int rc = 0; | |
588 | int xid; | |
c21dfb69 | 589 | struct cifsFileInfo *pCFileStruct = file->private_data; |
1da177e4 LT |
590 | char *ptmp; |
591 | ||
b6b38f70 | 592 | cFYI(1, "Closedir inode = 0x%p", inode); |
1da177e4 LT |
593 | |
594 | xid = GetXid(); | |
595 | ||
596 | if (pCFileStruct) { | |
13cfb733 | 597 | struct cifsTconInfo *pTcon = tlink_tcon(pCFileStruct->tlink); |
1da177e4 | 598 | |
b6b38f70 | 599 | cFYI(1, "Freeing private data in close dir"); |
4477288a | 600 | spin_lock(&cifs_file_list_lock); |
4b18f2a9 SF |
601 | if (!pCFileStruct->srch_inf.endOfSearch && |
602 | !pCFileStruct->invalidHandle) { | |
603 | pCFileStruct->invalidHandle = true; | |
4477288a | 604 | spin_unlock(&cifs_file_list_lock); |
1da177e4 | 605 | rc = CIFSFindClose(xid, pTcon, pCFileStruct->netfid); |
b6b38f70 JP |
606 | cFYI(1, "Closing uncompleted readdir with rc %d", |
607 | rc); | |
1da177e4 LT |
608 | /* not much we can do if it fails anyway, ignore rc */ |
609 | rc = 0; | |
ddb4cbfc | 610 | } else |
4477288a | 611 | spin_unlock(&cifs_file_list_lock); |
1da177e4 LT |
612 | ptmp = pCFileStruct->srch_inf.ntwrk_buf_start; |
613 | if (ptmp) { | |
b6b38f70 | 614 | cFYI(1, "closedir free smb buf in srch struct"); |
1da177e4 | 615 | pCFileStruct->srch_inf.ntwrk_buf_start = NULL; |
fb8c4b14 | 616 | if (pCFileStruct->srch_inf.smallBuf) |
d47d7c1a SF |
617 | cifs_small_buf_release(ptmp); |
618 | else | |
619 | cifs_buf_release(ptmp); | |
1da177e4 | 620 | } |
13cfb733 | 621 | cifs_put_tlink(pCFileStruct->tlink); |
1da177e4 LT |
622 | kfree(file->private_data); |
623 | file->private_data = NULL; | |
624 | } | |
625 | /* BB can we lock the filestruct while this is going on? */ | |
626 | FreeXid(xid); | |
627 | return rc; | |
628 | } | |
629 | ||
7ee1af76 JA |
630 | static int store_file_lock(struct cifsFileInfo *fid, __u64 len, |
631 | __u64 offset, __u8 lockType) | |
632 | { | |
fb8c4b14 SF |
633 | struct cifsLockInfo *li = |
634 | kmalloc(sizeof(struct cifsLockInfo), GFP_KERNEL); | |
7ee1af76 JA |
635 | if (li == NULL) |
636 | return -ENOMEM; | |
637 | li->offset = offset; | |
638 | li->length = len; | |
639 | li->type = lockType; | |
796e5661 | 640 | mutex_lock(&fid->lock_mutex); |
7ee1af76 | 641 | list_add(&li->llist, &fid->llist); |
796e5661 | 642 | mutex_unlock(&fid->lock_mutex); |
7ee1af76 JA |
643 | return 0; |
644 | } | |
645 | ||
1da177e4 LT |
646 | int cifs_lock(struct file *file, int cmd, struct file_lock *pfLock) |
647 | { | |
648 | int rc, xid; | |
1da177e4 LT |
649 | __u32 numLock = 0; |
650 | __u32 numUnlock = 0; | |
651 | __u64 length; | |
4b18f2a9 | 652 | bool wait_flag = false; |
1da177e4 | 653 | struct cifs_sb_info *cifs_sb; |
13a6e42a | 654 | struct cifsTconInfo *tcon; |
08547b03 SF |
655 | __u16 netfid; |
656 | __u8 lockType = LOCKING_ANDX_LARGE_FILES; | |
13a6e42a | 657 | bool posix_locking = 0; |
1da177e4 LT |
658 | |
659 | length = 1 + pfLock->fl_end - pfLock->fl_start; | |
660 | rc = -EACCES; | |
661 | xid = GetXid(); | |
662 | ||
b6b38f70 | 663 | cFYI(1, "Lock parm: 0x%x flockflags: " |
1da177e4 | 664 | "0x%x flocktype: 0x%x start: %lld end: %lld", |
fb8c4b14 | 665 | cmd, pfLock->fl_flags, pfLock->fl_type, pfLock->fl_start, |
b6b38f70 | 666 | pfLock->fl_end); |
1da177e4 LT |
667 | |
668 | if (pfLock->fl_flags & FL_POSIX) | |
b6b38f70 | 669 | cFYI(1, "Posix"); |
1da177e4 | 670 | if (pfLock->fl_flags & FL_FLOCK) |
b6b38f70 | 671 | cFYI(1, "Flock"); |
1da177e4 | 672 | if (pfLock->fl_flags & FL_SLEEP) { |
b6b38f70 | 673 | cFYI(1, "Blocking lock"); |
4b18f2a9 | 674 | wait_flag = true; |
1da177e4 LT |
675 | } |
676 | if (pfLock->fl_flags & FL_ACCESS) | |
b6b38f70 JP |
677 | cFYI(1, "Process suspended by mandatory locking - " |
678 | "not implemented yet"); | |
1da177e4 | 679 | if (pfLock->fl_flags & FL_LEASE) |
b6b38f70 | 680 | cFYI(1, "Lease on file - not implemented yet"); |
fb8c4b14 | 681 | if (pfLock->fl_flags & |
1da177e4 | 682 | (~(FL_POSIX | FL_FLOCK | FL_SLEEP | FL_ACCESS | FL_LEASE))) |
b6b38f70 | 683 | cFYI(1, "Unknown lock flags 0x%x", pfLock->fl_flags); |
1da177e4 LT |
684 | |
685 | if (pfLock->fl_type == F_WRLCK) { | |
b6b38f70 | 686 | cFYI(1, "F_WRLCK "); |
1da177e4 LT |
687 | numLock = 1; |
688 | } else if (pfLock->fl_type == F_UNLCK) { | |
b6b38f70 | 689 | cFYI(1, "F_UNLCK"); |
1da177e4 | 690 | numUnlock = 1; |
d47d7c1a SF |
691 | /* Check if unlock includes more than |
692 | one lock range */ | |
1da177e4 | 693 | } else if (pfLock->fl_type == F_RDLCK) { |
b6b38f70 | 694 | cFYI(1, "F_RDLCK"); |
1da177e4 LT |
695 | lockType |= LOCKING_ANDX_SHARED_LOCK; |
696 | numLock = 1; | |
697 | } else if (pfLock->fl_type == F_EXLCK) { | |
b6b38f70 | 698 | cFYI(1, "F_EXLCK"); |
1da177e4 LT |
699 | numLock = 1; |
700 | } else if (pfLock->fl_type == F_SHLCK) { | |
b6b38f70 | 701 | cFYI(1, "F_SHLCK"); |
1da177e4 LT |
702 | lockType |= LOCKING_ANDX_SHARED_LOCK; |
703 | numLock = 1; | |
704 | } else | |
b6b38f70 | 705 | cFYI(1, "Unknown type of lock"); |
1da177e4 | 706 | |
e6a00296 | 707 | cifs_sb = CIFS_SB(file->f_path.dentry->d_sb); |
13cfb733 | 708 | tcon = tlink_tcon(((struct cifsFileInfo *)file->private_data)->tlink); |
08547b03 SF |
709 | netfid = ((struct cifsFileInfo *)file->private_data)->netfid; |
710 | ||
13a6e42a SF |
711 | if ((tcon->ses->capabilities & CAP_UNIX) && |
712 | (CIFS_UNIX_FCNTL_CAP & le64_to_cpu(tcon->fsUnixInfo.Capability)) && | |
acc18aa1 | 713 | ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NOPOSIXBRL) == 0)) |
13a6e42a | 714 | posix_locking = 1; |
08547b03 SF |
715 | /* BB add code here to normalize offset and length to |
716 | account for negative length which we can not accept over the | |
717 | wire */ | |
1da177e4 | 718 | if (IS_GETLK(cmd)) { |
fb8c4b14 | 719 | if (posix_locking) { |
08547b03 | 720 | int posix_lock_type; |
fb8c4b14 | 721 | if (lockType & LOCKING_ANDX_SHARED_LOCK) |
08547b03 SF |
722 | posix_lock_type = CIFS_RDLCK; |
723 | else | |
724 | posix_lock_type = CIFS_WRLCK; | |
13a6e42a | 725 | rc = CIFSSMBPosixLock(xid, tcon, netfid, 1 /* get */, |
fc94cdb9 | 726 | length, pfLock, |
08547b03 SF |
727 | posix_lock_type, wait_flag); |
728 | FreeXid(xid); | |
729 | return rc; | |
730 | } | |
731 | ||
732 | /* BB we could chain these into one lock request BB */ | |
13a6e42a | 733 | rc = CIFSSMBLock(xid, tcon, netfid, length, pfLock->fl_start, |
12fed00d | 734 | 0, 1, lockType, 0 /* wait flag */, 0); |
1da177e4 | 735 | if (rc == 0) { |
13a6e42a | 736 | rc = CIFSSMBLock(xid, tcon, netfid, length, |
1da177e4 LT |
737 | pfLock->fl_start, 1 /* numUnlock */ , |
738 | 0 /* numLock */ , lockType, | |
12fed00d | 739 | 0 /* wait flag */, 0); |
1da177e4 LT |
740 | pfLock->fl_type = F_UNLCK; |
741 | if (rc != 0) | |
b6b38f70 JP |
742 | cERROR(1, "Error unlocking previously locked " |
743 | "range %d during test of lock", rc); | |
1da177e4 LT |
744 | rc = 0; |
745 | ||
746 | } else { | |
747 | /* if rc == ERR_SHARING_VIOLATION ? */ | |
f05337c6 PS |
748 | rc = 0; |
749 | ||
750 | if (lockType & LOCKING_ANDX_SHARED_LOCK) { | |
751 | pfLock->fl_type = F_WRLCK; | |
752 | } else { | |
753 | rc = CIFSSMBLock(xid, tcon, netfid, length, | |
754 | pfLock->fl_start, 0, 1, | |
755 | lockType | LOCKING_ANDX_SHARED_LOCK, | |
12fed00d | 756 | 0 /* wait flag */, 0); |
f05337c6 PS |
757 | if (rc == 0) { |
758 | rc = CIFSSMBLock(xid, tcon, netfid, | |
759 | length, pfLock->fl_start, 1, 0, | |
760 | lockType | | |
761 | LOCKING_ANDX_SHARED_LOCK, | |
12fed00d | 762 | 0 /* wait flag */, 0); |
f05337c6 PS |
763 | pfLock->fl_type = F_RDLCK; |
764 | if (rc != 0) | |
f19159dc | 765 | cERROR(1, "Error unlocking " |
f05337c6 | 766 | "previously locked range %d " |
f19159dc | 767 | "during test of lock", rc); |
f05337c6 PS |
768 | rc = 0; |
769 | } else { | |
770 | pfLock->fl_type = F_WRLCK; | |
771 | rc = 0; | |
772 | } | |
773 | } | |
1da177e4 LT |
774 | } |
775 | ||
776 | FreeXid(xid); | |
777 | return rc; | |
778 | } | |
7ee1af76 JA |
779 | |
780 | if (!numLock && !numUnlock) { | |
781 | /* if no lock or unlock then nothing | |
782 | to do since we do not know what it is */ | |
783 | FreeXid(xid); | |
784 | return -EOPNOTSUPP; | |
785 | } | |
786 | ||
787 | if (posix_locking) { | |
08547b03 | 788 | int posix_lock_type; |
fb8c4b14 | 789 | if (lockType & LOCKING_ANDX_SHARED_LOCK) |
08547b03 SF |
790 | posix_lock_type = CIFS_RDLCK; |
791 | else | |
792 | posix_lock_type = CIFS_WRLCK; | |
50c2f753 | 793 | |
fb8c4b14 | 794 | if (numUnlock == 1) |
beb84dc8 | 795 | posix_lock_type = CIFS_UNLCK; |
7ee1af76 | 796 | |
13a6e42a | 797 | rc = CIFSSMBPosixLock(xid, tcon, netfid, 0 /* set */, |
fc94cdb9 | 798 | length, pfLock, |
08547b03 | 799 | posix_lock_type, wait_flag); |
7ee1af76 | 800 | } else { |
c21dfb69 | 801 | struct cifsFileInfo *fid = file->private_data; |
7ee1af76 JA |
802 | |
803 | if (numLock) { | |
13a6e42a | 804 | rc = CIFSSMBLock(xid, tcon, netfid, length, |
12fed00d PS |
805 | pfLock->fl_start, 0, numLock, lockType, |
806 | wait_flag, 0); | |
7ee1af76 JA |
807 | |
808 | if (rc == 0) { | |
809 | /* For Windows locks we must store them. */ | |
810 | rc = store_file_lock(fid, length, | |
811 | pfLock->fl_start, lockType); | |
812 | } | |
813 | } else if (numUnlock) { | |
814 | /* For each stored lock that this unlock overlaps | |
815 | completely, unlock it. */ | |
816 | int stored_rc = 0; | |
817 | struct cifsLockInfo *li, *tmp; | |
818 | ||
6b70c955 | 819 | rc = 0; |
796e5661 | 820 | mutex_lock(&fid->lock_mutex); |
7ee1af76 JA |
821 | list_for_each_entry_safe(li, tmp, &fid->llist, llist) { |
822 | if (pfLock->fl_start <= li->offset && | |
c19eb710 | 823 | (pfLock->fl_start + length) >= |
39db810c | 824 | (li->offset + li->length)) { |
13a6e42a | 825 | stored_rc = CIFSSMBLock(xid, tcon, |
12fed00d PS |
826 | netfid, li->length, |
827 | li->offset, 1, 0, | |
828 | li->type, false, 0); | |
7ee1af76 JA |
829 | if (stored_rc) |
830 | rc = stored_rc; | |
2c964d1f PS |
831 | else { |
832 | list_del(&li->llist); | |
833 | kfree(li); | |
834 | } | |
7ee1af76 JA |
835 | } |
836 | } | |
796e5661 | 837 | mutex_unlock(&fid->lock_mutex); |
7ee1af76 JA |
838 | } |
839 | } | |
840 | ||
d634cc15 | 841 | if (pfLock->fl_flags & FL_POSIX) |
1da177e4 LT |
842 | posix_lock_file_wait(file, pfLock); |
843 | FreeXid(xid); | |
844 | return rc; | |
845 | } | |
846 | ||
fbec9ab9 | 847 | /* update the file size (if needed) after a write */ |
72432ffc | 848 | void |
fbec9ab9 JL |
849 | cifs_update_eof(struct cifsInodeInfo *cifsi, loff_t offset, |
850 | unsigned int bytes_written) | |
851 | { | |
852 | loff_t end_of_write = offset + bytes_written; | |
853 | ||
854 | if (end_of_write > cifsi->server_eof) | |
855 | cifsi->server_eof = end_of_write; | |
856 | } | |
857 | ||
1da177e4 LT |
858 | ssize_t cifs_user_write(struct file *file, const char __user *write_data, |
859 | size_t write_size, loff_t *poffset) | |
860 | { | |
50ae28f0 | 861 | struct inode *inode = file->f_path.dentry->d_inode; |
1da177e4 LT |
862 | int rc = 0; |
863 | unsigned int bytes_written = 0; | |
864 | unsigned int total_written; | |
865 | struct cifs_sb_info *cifs_sb; | |
866 | struct cifsTconInfo *pTcon; | |
7749981e | 867 | int xid; |
1da177e4 | 868 | struct cifsFileInfo *open_file; |
50ae28f0 | 869 | struct cifsInodeInfo *cifsi = CIFS_I(inode); |
1da177e4 | 870 | |
e6a00296 | 871 | cifs_sb = CIFS_SB(file->f_path.dentry->d_sb); |
1da177e4 | 872 | |
b6b38f70 JP |
873 | /* cFYI(1, " write %d bytes to offset %lld of %s", write_size, |
874 | *poffset, file->f_path.dentry->d_name.name); */ | |
1da177e4 LT |
875 | |
876 | if (file->private_data == NULL) | |
877 | return -EBADF; | |
ba00ba64 | 878 | |
c21dfb69 | 879 | open_file = file->private_data; |
13cfb733 | 880 | pTcon = tlink_tcon(open_file->tlink); |
50c2f753 | 881 | |
838726c4 JL |
882 | rc = generic_write_checks(file, poffset, &write_size, 0); |
883 | if (rc) | |
884 | return rc; | |
885 | ||
1da177e4 | 886 | xid = GetXid(); |
1da177e4 | 887 | |
1da177e4 LT |
888 | for (total_written = 0; write_size > total_written; |
889 | total_written += bytes_written) { | |
890 | rc = -EAGAIN; | |
891 | while (rc == -EAGAIN) { | |
892 | if (file->private_data == NULL) { | |
893 | /* file has been closed on us */ | |
894 | FreeXid(xid); | |
895 | /* if we have gotten here we have written some data | |
896 | and blocked, and the file has been freed on us while | |
897 | we blocked so return what we managed to write */ | |
898 | return total_written; | |
fb8c4b14 | 899 | } |
1da177e4 | 900 | if (open_file->invalidHandle) { |
1da177e4 LT |
901 | /* we could deadlock if we called |
902 | filemap_fdatawait from here so tell | |
903 | reopen_file not to flush data to server | |
904 | now */ | |
15886177 | 905 | rc = cifs_reopen_file(open_file, false); |
1da177e4 LT |
906 | if (rc != 0) |
907 | break; | |
908 | } | |
909 | ||
910 | rc = CIFSSMBWrite(xid, pTcon, | |
911 | open_file->netfid, | |
912 | min_t(const int, cifs_sb->wsize, | |
913 | write_size - total_written), | |
914 | *poffset, &bytes_written, | |
7749981e | 915 | NULL, write_data + total_written, 0); |
1da177e4 LT |
916 | } |
917 | if (rc || (bytes_written == 0)) { | |
918 | if (total_written) | |
919 | break; | |
920 | else { | |
921 | FreeXid(xid); | |
922 | return rc; | |
923 | } | |
fbec9ab9 JL |
924 | } else { |
925 | cifs_update_eof(cifsi, *poffset, bytes_written); | |
1da177e4 | 926 | *poffset += bytes_written; |
fbec9ab9 | 927 | } |
1da177e4 LT |
928 | } |
929 | ||
a4544347 | 930 | cifs_stats_bytes_written(pTcon, total_written); |
1da177e4 | 931 | |
fb8c4b14 | 932 | /* Do not update local mtime - server will set its actual value on write |
50ae28f0 JS |
933 | * inode->i_ctime = inode->i_mtime = |
934 | * current_fs_time(inode->i_sb);*/ | |
935 | if (total_written > 0) { | |
936 | spin_lock(&inode->i_lock); | |
937 | if (*poffset > inode->i_size) | |
938 | i_size_write(inode, *poffset); | |
939 | spin_unlock(&inode->i_lock); | |
1da177e4 | 940 | } |
50ae28f0 JS |
941 | mark_inode_dirty_sync(inode); |
942 | ||
1da177e4 LT |
943 | FreeXid(xid); |
944 | return total_written; | |
945 | } | |
946 | ||
7da4b49a JL |
947 | static ssize_t cifs_write(struct cifsFileInfo *open_file, |
948 | const char *write_data, size_t write_size, | |
949 | loff_t *poffset) | |
1da177e4 LT |
950 | { |
951 | int rc = 0; | |
952 | unsigned int bytes_written = 0; | |
953 | unsigned int total_written; | |
954 | struct cifs_sb_info *cifs_sb; | |
955 | struct cifsTconInfo *pTcon; | |
7749981e | 956 | int xid; |
7da4b49a JL |
957 | struct dentry *dentry = open_file->dentry; |
958 | struct cifsInodeInfo *cifsi = CIFS_I(dentry->d_inode); | |
1da177e4 | 959 | |
7da4b49a | 960 | cifs_sb = CIFS_SB(dentry->d_sb); |
1da177e4 | 961 | |
b6b38f70 | 962 | cFYI(1, "write %zd bytes to offset %lld of %s", write_size, |
7da4b49a | 963 | *poffset, dentry->d_name.name); |
1da177e4 | 964 | |
13cfb733 | 965 | pTcon = tlink_tcon(open_file->tlink); |
50c2f753 | 966 | |
1da177e4 | 967 | xid = GetXid(); |
1da177e4 | 968 | |
1da177e4 LT |
969 | for (total_written = 0; write_size > total_written; |
970 | total_written += bytes_written) { | |
971 | rc = -EAGAIN; | |
972 | while (rc == -EAGAIN) { | |
1da177e4 | 973 | if (open_file->invalidHandle) { |
1da177e4 LT |
974 | /* we could deadlock if we called |
975 | filemap_fdatawait from here so tell | |
fb8c4b14 | 976 | reopen_file not to flush data to |
1da177e4 | 977 | server now */ |
15886177 | 978 | rc = cifs_reopen_file(open_file, false); |
1da177e4 LT |
979 | if (rc != 0) |
980 | break; | |
981 | } | |
fb8c4b14 SF |
982 | if (experimEnabled || (pTcon->ses->server && |
983 | ((pTcon->ses->server->secMode & | |
08775834 | 984 | (SECMODE_SIGN_REQUIRED | SECMODE_SIGN_ENABLED)) |
c01f36a8 | 985 | == 0))) { |
3e84469d SF |
986 | struct kvec iov[2]; |
987 | unsigned int len; | |
988 | ||
0ae0efad | 989 | len = min((size_t)cifs_sb->wsize, |
3e84469d SF |
990 | write_size - total_written); |
991 | /* iov[0] is reserved for smb header */ | |
992 | iov[1].iov_base = (char *)write_data + | |
993 | total_written; | |
994 | iov[1].iov_len = len; | |
d6e04ae6 | 995 | rc = CIFSSMBWrite2(xid, pTcon, |
3e84469d | 996 | open_file->netfid, len, |
d6e04ae6 | 997 | *poffset, &bytes_written, |
7749981e | 998 | iov, 1, 0); |
d6e04ae6 | 999 | } else |
60808233 SF |
1000 | rc = CIFSSMBWrite(xid, pTcon, |
1001 | open_file->netfid, | |
1002 | min_t(const int, cifs_sb->wsize, | |
1003 | write_size - total_written), | |
1004 | *poffset, &bytes_written, | |
1005 | write_data + total_written, | |
7749981e | 1006 | NULL, 0); |
1da177e4 LT |
1007 | } |
1008 | if (rc || (bytes_written == 0)) { | |
1009 | if (total_written) | |
1010 | break; | |
1011 | else { | |
1012 | FreeXid(xid); | |
1013 | return rc; | |
1014 | } | |
fbec9ab9 JL |
1015 | } else { |
1016 | cifs_update_eof(cifsi, *poffset, bytes_written); | |
1da177e4 | 1017 | *poffset += bytes_written; |
fbec9ab9 | 1018 | } |
1da177e4 LT |
1019 | } |
1020 | ||
a4544347 | 1021 | cifs_stats_bytes_written(pTcon, total_written); |
1da177e4 | 1022 | |
7da4b49a JL |
1023 | if (total_written > 0) { |
1024 | spin_lock(&dentry->d_inode->i_lock); | |
1025 | if (*poffset > dentry->d_inode->i_size) | |
1026 | i_size_write(dentry->d_inode, *poffset); | |
1027 | spin_unlock(&dentry->d_inode->i_lock); | |
1da177e4 | 1028 | } |
7da4b49a | 1029 | mark_inode_dirty_sync(dentry->d_inode); |
1da177e4 LT |
1030 | FreeXid(xid); |
1031 | return total_written; | |
1032 | } | |
1033 | ||
6508d904 JL |
1034 | struct cifsFileInfo *find_readable_file(struct cifsInodeInfo *cifs_inode, |
1035 | bool fsuid_only) | |
630f3f0c SF |
1036 | { |
1037 | struct cifsFileInfo *open_file = NULL; | |
6508d904 JL |
1038 | struct cifs_sb_info *cifs_sb = CIFS_SB(cifs_inode->vfs_inode.i_sb); |
1039 | ||
1040 | /* only filter by fsuid on multiuser mounts */ | |
1041 | if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MULTIUSER)) | |
1042 | fsuid_only = false; | |
630f3f0c | 1043 | |
4477288a | 1044 | spin_lock(&cifs_file_list_lock); |
630f3f0c SF |
1045 | /* we could simply get the first_list_entry since write-only entries |
1046 | are always at the end of the list but since the first entry might | |
1047 | have a close pending, we go through the whole list */ | |
1048 | list_for_each_entry(open_file, &cifs_inode->openFileList, flist) { | |
6508d904 JL |
1049 | if (fsuid_only && open_file->uid != current_fsuid()) |
1050 | continue; | |
2e396b83 | 1051 | if (OPEN_FMODE(open_file->f_flags) & FMODE_READ) { |
630f3f0c SF |
1052 | if (!open_file->invalidHandle) { |
1053 | /* found a good file */ | |
1054 | /* lock it so it will not be closed on us */ | |
6ab409b5 | 1055 | cifsFileInfo_get(open_file); |
4477288a | 1056 | spin_unlock(&cifs_file_list_lock); |
630f3f0c SF |
1057 | return open_file; |
1058 | } /* else might as well continue, and look for | |
1059 | another, or simply have the caller reopen it | |
1060 | again rather than trying to fix this handle */ | |
1061 | } else /* write only file */ | |
1062 | break; /* write only files are last so must be done */ | |
1063 | } | |
4477288a | 1064 | spin_unlock(&cifs_file_list_lock); |
630f3f0c SF |
1065 | return NULL; |
1066 | } | |
630f3f0c | 1067 | |
6508d904 JL |
1068 | struct cifsFileInfo *find_writable_file(struct cifsInodeInfo *cifs_inode, |
1069 | bool fsuid_only) | |
6148a742 SF |
1070 | { |
1071 | struct cifsFileInfo *open_file; | |
d3892294 | 1072 | struct cifs_sb_info *cifs_sb; |
2846d386 | 1073 | bool any_available = false; |
dd99cd80 | 1074 | int rc; |
6148a742 | 1075 | |
60808233 SF |
1076 | /* Having a null inode here (because mapping->host was set to zero by |
1077 | the VFS or MM) should not happen but we had reports of on oops (due to | |
1078 | it being zero) during stress testcases so we need to check for it */ | |
1079 | ||
fb8c4b14 | 1080 | if (cifs_inode == NULL) { |
b6b38f70 | 1081 | cERROR(1, "Null inode passed to cifs_writeable_file"); |
60808233 SF |
1082 | dump_stack(); |
1083 | return NULL; | |
1084 | } | |
1085 | ||
d3892294 JL |
1086 | cifs_sb = CIFS_SB(cifs_inode->vfs_inode.i_sb); |
1087 | ||
6508d904 JL |
1088 | /* only filter by fsuid on multiuser mounts */ |
1089 | if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MULTIUSER)) | |
1090 | fsuid_only = false; | |
1091 | ||
4477288a | 1092 | spin_lock(&cifs_file_list_lock); |
9b22b0b7 | 1093 | refind_writable: |
6148a742 | 1094 | list_for_each_entry(open_file, &cifs_inode->openFileList, flist) { |
6508d904 JL |
1095 | if (!any_available && open_file->pid != current->tgid) |
1096 | continue; | |
1097 | if (fsuid_only && open_file->uid != current_fsuid()) | |
6148a742 | 1098 | continue; |
2e396b83 | 1099 | if (OPEN_FMODE(open_file->f_flags) & FMODE_WRITE) { |
6ab409b5 | 1100 | cifsFileInfo_get(open_file); |
9b22b0b7 SF |
1101 | |
1102 | if (!open_file->invalidHandle) { | |
1103 | /* found a good writable file */ | |
4477288a | 1104 | spin_unlock(&cifs_file_list_lock); |
9b22b0b7 SF |
1105 | return open_file; |
1106 | } | |
8840dee9 | 1107 | |
4477288a | 1108 | spin_unlock(&cifs_file_list_lock); |
cdff08e7 | 1109 | |
9b22b0b7 | 1110 | /* Had to unlock since following call can block */ |
15886177 | 1111 | rc = cifs_reopen_file(open_file, false); |
cdff08e7 SF |
1112 | if (!rc) |
1113 | return open_file; | |
9b22b0b7 | 1114 | |
cdff08e7 | 1115 | /* if it fails, try another handle if possible */ |
b6b38f70 | 1116 | cFYI(1, "wp failed on reopen file"); |
6ab409b5 | 1117 | cifsFileInfo_put(open_file); |
8840dee9 | 1118 | |
cdff08e7 SF |
1119 | spin_lock(&cifs_file_list_lock); |
1120 | ||
9b22b0b7 SF |
1121 | /* else we simply continue to the next entry. Thus |
1122 | we do not loop on reopen errors. If we | |
1123 | can not reopen the file, for example if we | |
1124 | reconnected to a server with another client | |
1125 | racing to delete or lock the file we would not | |
1126 | make progress if we restarted before the beginning | |
1127 | of the loop here. */ | |
6148a742 SF |
1128 | } |
1129 | } | |
2846d386 JL |
1130 | /* couldn't find useable FH with same pid, try any available */ |
1131 | if (!any_available) { | |
1132 | any_available = true; | |
1133 | goto refind_writable; | |
1134 | } | |
4477288a | 1135 | spin_unlock(&cifs_file_list_lock); |
6148a742 SF |
1136 | return NULL; |
1137 | } | |
1138 | ||
1da177e4 LT |
1139 | static int cifs_partialpagewrite(struct page *page, unsigned from, unsigned to) |
1140 | { | |
1141 | struct address_space *mapping = page->mapping; | |
1142 | loff_t offset = (loff_t)page->index << PAGE_CACHE_SHIFT; | |
1143 | char *write_data; | |
1144 | int rc = -EFAULT; | |
1145 | int bytes_written = 0; | |
1da177e4 | 1146 | struct inode *inode; |
6148a742 | 1147 | struct cifsFileInfo *open_file; |
1da177e4 LT |
1148 | |
1149 | if (!mapping || !mapping->host) | |
1150 | return -EFAULT; | |
1151 | ||
1152 | inode = page->mapping->host; | |
1da177e4 LT |
1153 | |
1154 | offset += (loff_t)from; | |
1155 | write_data = kmap(page); | |
1156 | write_data += from; | |
1157 | ||
1158 | if ((to > PAGE_CACHE_SIZE) || (from > to)) { | |
1159 | kunmap(page); | |
1160 | return -EIO; | |
1161 | } | |
1162 | ||
1163 | /* racing with truncate? */ | |
1164 | if (offset > mapping->host->i_size) { | |
1165 | kunmap(page); | |
1166 | return 0; /* don't care */ | |
1167 | } | |
1168 | ||
1169 | /* check to make sure that we are not extending the file */ | |
1170 | if (mapping->host->i_size - offset < (loff_t)to) | |
fb8c4b14 | 1171 | to = (unsigned)(mapping->host->i_size - offset); |
1da177e4 | 1172 | |
6508d904 | 1173 | open_file = find_writable_file(CIFS_I(mapping->host), false); |
6148a742 | 1174 | if (open_file) { |
7da4b49a JL |
1175 | bytes_written = cifs_write(open_file, write_data, |
1176 | to - from, &offset); | |
6ab409b5 | 1177 | cifsFileInfo_put(open_file); |
1da177e4 | 1178 | /* Does mm or vfs already set times? */ |
6148a742 | 1179 | inode->i_atime = inode->i_mtime = current_fs_time(inode->i_sb); |
bb5a9a04 | 1180 | if ((bytes_written > 0) && (offset)) |
6148a742 | 1181 | rc = 0; |
bb5a9a04 SF |
1182 | else if (bytes_written < 0) |
1183 | rc = bytes_written; | |
6148a742 | 1184 | } else { |
b6b38f70 | 1185 | cFYI(1, "No writeable filehandles for inode"); |
1da177e4 LT |
1186 | rc = -EIO; |
1187 | } | |
1188 | ||
1189 | kunmap(page); | |
1190 | return rc; | |
1191 | } | |
1192 | ||
1da177e4 | 1193 | static int cifs_writepages(struct address_space *mapping, |
37c0eb46 | 1194 | struct writeback_control *wbc) |
1da177e4 | 1195 | { |
37c0eb46 SF |
1196 | unsigned int bytes_to_write; |
1197 | unsigned int bytes_written; | |
1198 | struct cifs_sb_info *cifs_sb; | |
1199 | int done = 0; | |
111ebb6e | 1200 | pgoff_t end; |
37c0eb46 | 1201 | pgoff_t index; |
fb8c4b14 SF |
1202 | int range_whole = 0; |
1203 | struct kvec *iov; | |
84d2f07e | 1204 | int len; |
37c0eb46 SF |
1205 | int n_iov = 0; |
1206 | pgoff_t next; | |
1207 | int nr_pages; | |
1208 | __u64 offset = 0; | |
23e7dd7d | 1209 | struct cifsFileInfo *open_file; |
ba00ba64 | 1210 | struct cifsTconInfo *tcon; |
fbec9ab9 | 1211 | struct cifsInodeInfo *cifsi = CIFS_I(mapping->host); |
37c0eb46 SF |
1212 | struct page *page; |
1213 | struct pagevec pvec; | |
1214 | int rc = 0; | |
1215 | int scanned = 0; | |
7749981e | 1216 | int xid; |
1da177e4 | 1217 | |
37c0eb46 | 1218 | cifs_sb = CIFS_SB(mapping->host->i_sb); |
50c2f753 | 1219 | |
37c0eb46 SF |
1220 | /* |
1221 | * If wsize is smaller that the page cache size, default to writing | |
1222 | * one page at a time via cifs_writepage | |
1223 | */ | |
1224 | if (cifs_sb->wsize < PAGE_CACHE_SIZE) | |
1225 | return generic_writepages(mapping, wbc); | |
1226 | ||
9a0c8230 | 1227 | iov = kmalloc(32 * sizeof(struct kvec), GFP_KERNEL); |
fb8c4b14 | 1228 | if (iov == NULL) |
9a0c8230 SF |
1229 | return generic_writepages(mapping, wbc); |
1230 | ||
37c0eb46 | 1231 | /* |
f3983c21 JL |
1232 | * if there's no open file, then this is likely to fail too, |
1233 | * but it'll at least handle the return. Maybe it should be | |
1234 | * a BUG() instead? | |
37c0eb46 | 1235 | */ |
6508d904 | 1236 | open_file = find_writable_file(CIFS_I(mapping->host), false); |
f3983c21 | 1237 | if (!open_file) { |
9a0c8230 | 1238 | kfree(iov); |
f3983c21 JL |
1239 | return generic_writepages(mapping, wbc); |
1240 | } | |
1241 | ||
13cfb733 | 1242 | tcon = tlink_tcon(open_file->tlink); |
f3983c21 JL |
1243 | if (!experimEnabled && tcon->ses->server->secMode & |
1244 | (SECMODE_SIGN_REQUIRED | SECMODE_SIGN_ENABLED)) { | |
1245 | cifsFileInfo_put(open_file); | |
6b035904 | 1246 | kfree(iov); |
f3983c21 | 1247 | return generic_writepages(mapping, wbc); |
37c0eb46 | 1248 | } |
f3983c21 | 1249 | cifsFileInfo_put(open_file); |
37c0eb46 | 1250 | |
1da177e4 LT |
1251 | xid = GetXid(); |
1252 | ||
37c0eb46 | 1253 | pagevec_init(&pvec, 0); |
111ebb6e | 1254 | if (wbc->range_cyclic) { |
37c0eb46 | 1255 | index = mapping->writeback_index; /* Start from prev offset */ |
111ebb6e OH |
1256 | end = -1; |
1257 | } else { | |
1258 | index = wbc->range_start >> PAGE_CACHE_SHIFT; | |
1259 | end = wbc->range_end >> PAGE_CACHE_SHIFT; | |
1260 | if (wbc->range_start == 0 && wbc->range_end == LLONG_MAX) | |
1261 | range_whole = 1; | |
37c0eb46 SF |
1262 | scanned = 1; |
1263 | } | |
1264 | retry: | |
1265 | while (!done && (index <= end) && | |
1266 | (nr_pages = pagevec_lookup_tag(&pvec, mapping, &index, | |
1267 | PAGECACHE_TAG_DIRTY, | |
1268 | min(end - index, (pgoff_t)PAGEVEC_SIZE - 1) + 1))) { | |
1269 | int first; | |
1270 | unsigned int i; | |
1271 | ||
37c0eb46 SF |
1272 | first = -1; |
1273 | next = 0; | |
1274 | n_iov = 0; | |
1275 | bytes_to_write = 0; | |
1276 | ||
1277 | for (i = 0; i < nr_pages; i++) { | |
1278 | page = pvec.pages[i]; | |
1279 | /* | |
1280 | * At this point we hold neither mapping->tree_lock nor | |
1281 | * lock on the page itself: the page may be truncated or | |
1282 | * invalidated (changing page->mapping to NULL), or even | |
1283 | * swizzled back from swapper_space to tmpfs file | |
1284 | * mapping | |
1285 | */ | |
1286 | ||
1287 | if (first < 0) | |
1288 | lock_page(page); | |
529ae9aa | 1289 | else if (!trylock_page(page)) |
37c0eb46 SF |
1290 | break; |
1291 | ||
1292 | if (unlikely(page->mapping != mapping)) { | |
1293 | unlock_page(page); | |
1294 | break; | |
1295 | } | |
1296 | ||
111ebb6e | 1297 | if (!wbc->range_cyclic && page->index > end) { |
37c0eb46 SF |
1298 | done = 1; |
1299 | unlock_page(page); | |
1300 | break; | |
1301 | } | |
1302 | ||
1303 | if (next && (page->index != next)) { | |
1304 | /* Not next consecutive page */ | |
1305 | unlock_page(page); | |
1306 | break; | |
1307 | } | |
1308 | ||
1309 | if (wbc->sync_mode != WB_SYNC_NONE) | |
1310 | wait_on_page_writeback(page); | |
1311 | ||
1312 | if (PageWriteback(page) || | |
cb876f45 | 1313 | !clear_page_dirty_for_io(page)) { |
37c0eb46 SF |
1314 | unlock_page(page); |
1315 | break; | |
1316 | } | |
84d2f07e | 1317 | |
cb876f45 LT |
1318 | /* |
1319 | * This actually clears the dirty bit in the radix tree. | |
1320 | * See cifs_writepage() for more commentary. | |
1321 | */ | |
1322 | set_page_writeback(page); | |
1323 | ||
84d2f07e SF |
1324 | if (page_offset(page) >= mapping->host->i_size) { |
1325 | done = 1; | |
1326 | unlock_page(page); | |
cb876f45 | 1327 | end_page_writeback(page); |
84d2f07e SF |
1328 | break; |
1329 | } | |
1330 | ||
37c0eb46 SF |
1331 | /* |
1332 | * BB can we get rid of this? pages are held by pvec | |
1333 | */ | |
1334 | page_cache_get(page); | |
1335 | ||
84d2f07e SF |
1336 | len = min(mapping->host->i_size - page_offset(page), |
1337 | (loff_t)PAGE_CACHE_SIZE); | |
1338 | ||
37c0eb46 SF |
1339 | /* reserve iov[0] for the smb header */ |
1340 | n_iov++; | |
1341 | iov[n_iov].iov_base = kmap(page); | |
84d2f07e SF |
1342 | iov[n_iov].iov_len = len; |
1343 | bytes_to_write += len; | |
37c0eb46 SF |
1344 | |
1345 | if (first < 0) { | |
1346 | first = i; | |
1347 | offset = page_offset(page); | |
1348 | } | |
1349 | next = page->index + 1; | |
1350 | if (bytes_to_write + PAGE_CACHE_SIZE > cifs_sb->wsize) | |
1351 | break; | |
1352 | } | |
1353 | if (n_iov) { | |
941b853d | 1354 | retry_write: |
6508d904 JL |
1355 | open_file = find_writable_file(CIFS_I(mapping->host), |
1356 | false); | |
23e7dd7d | 1357 | if (!open_file) { |
b6b38f70 | 1358 | cERROR(1, "No writable handles for inode"); |
23e7dd7d | 1359 | rc = -EBADF; |
1047abc1 | 1360 | } else { |
f3983c21 | 1361 | rc = CIFSSMBWrite2(xid, tcon, open_file->netfid, |
23e7dd7d SF |
1362 | bytes_to_write, offset, |
1363 | &bytes_written, iov, n_iov, | |
7749981e | 1364 | 0); |
6ab409b5 | 1365 | cifsFileInfo_put(open_file); |
f3983c21 | 1366 | } |
fbec9ab9 | 1367 | |
941b853d JL |
1368 | cFYI(1, "Write2 rc=%d, wrote=%u", rc, bytes_written); |
1369 | ||
1370 | /* | |
1371 | * For now, treat a short write as if nothing got | |
1372 | * written. A zero length write however indicates | |
1373 | * ENOSPC or EFBIG. We have no way to know which | |
1374 | * though, so call it ENOSPC for now. EFBIG would | |
1375 | * get translated to AS_EIO anyway. | |
1376 | * | |
1377 | * FIXME: make it take into account the data that did | |
1378 | * get written | |
1379 | */ | |
1380 | if (rc == 0) { | |
1381 | if (bytes_written == 0) | |
1382 | rc = -ENOSPC; | |
1383 | else if (bytes_written < bytes_to_write) | |
1384 | rc = -EAGAIN; | |
1385 | } | |
1386 | ||
1387 | /* retry on data-integrity flush */ | |
1388 | if (wbc->sync_mode == WB_SYNC_ALL && rc == -EAGAIN) | |
1389 | goto retry_write; | |
1390 | ||
1391 | /* fix the stats and EOF */ | |
1392 | if (bytes_written > 0) { | |
f3983c21 | 1393 | cifs_stats_bytes_written(tcon, bytes_written); |
941b853d | 1394 | cifs_update_eof(cifsi, offset, bytes_written); |
37c0eb46 | 1395 | } |
f3983c21 | 1396 | |
37c0eb46 SF |
1397 | for (i = 0; i < n_iov; i++) { |
1398 | page = pvec.pages[first + i]; | |
941b853d JL |
1399 | /* on retryable write error, redirty page */ |
1400 | if (rc == -EAGAIN) | |
1401 | redirty_page_for_writepage(wbc, page); | |
1402 | else if (rc != 0) | |
eb9bdaa3 | 1403 | SetPageError(page); |
37c0eb46 SF |
1404 | kunmap(page); |
1405 | unlock_page(page); | |
cb876f45 | 1406 | end_page_writeback(page); |
37c0eb46 SF |
1407 | page_cache_release(page); |
1408 | } | |
941b853d JL |
1409 | |
1410 | if (rc != -EAGAIN) | |
1411 | mapping_set_error(mapping, rc); | |
1412 | else | |
1413 | rc = 0; | |
1414 | ||
37c0eb46 SF |
1415 | if ((wbc->nr_to_write -= n_iov) <= 0) |
1416 | done = 1; | |
1417 | index = next; | |
b066a48c DK |
1418 | } else |
1419 | /* Need to re-find the pages we skipped */ | |
1420 | index = pvec.pages[0]->index + 1; | |
1421 | ||
37c0eb46 SF |
1422 | pagevec_release(&pvec); |
1423 | } | |
1424 | if (!scanned && !done) { | |
1425 | /* | |
1426 | * We hit the last page and there is more work to be done: wrap | |
1427 | * back to the start of the file | |
1428 | */ | |
1429 | scanned = 1; | |
1430 | index = 0; | |
1431 | goto retry; | |
1432 | } | |
111ebb6e | 1433 | if (wbc->range_cyclic || (range_whole && wbc->nr_to_write > 0)) |
37c0eb46 SF |
1434 | mapping->writeback_index = index; |
1435 | ||
1da177e4 | 1436 | FreeXid(xid); |
9a0c8230 | 1437 | kfree(iov); |
1da177e4 LT |
1438 | return rc; |
1439 | } | |
1da177e4 | 1440 | |
fb8c4b14 | 1441 | static int cifs_writepage(struct page *page, struct writeback_control *wbc) |
1da177e4 LT |
1442 | { |
1443 | int rc = -EFAULT; | |
1444 | int xid; | |
1445 | ||
1446 | xid = GetXid(); | |
1447 | /* BB add check for wbc flags */ | |
1448 | page_cache_get(page); | |
ad7a2926 | 1449 | if (!PageUptodate(page)) |
b6b38f70 | 1450 | cFYI(1, "ppw - page not up to date"); |
cb876f45 LT |
1451 | |
1452 | /* | |
1453 | * Set the "writeback" flag, and clear "dirty" in the radix tree. | |
1454 | * | |
1455 | * A writepage() implementation always needs to do either this, | |
1456 | * or re-dirty the page with "redirty_page_for_writepage()" in | |
1457 | * the case of a failure. | |
1458 | * | |
1459 | * Just unlocking the page will cause the radix tree tag-bits | |
1460 | * to fail to update with the state of the page correctly. | |
1461 | */ | |
fb8c4b14 | 1462 | set_page_writeback(page); |
1da177e4 LT |
1463 | rc = cifs_partialpagewrite(page, 0, PAGE_CACHE_SIZE); |
1464 | SetPageUptodate(page); /* BB add check for error and Clearuptodate? */ | |
1465 | unlock_page(page); | |
cb876f45 LT |
1466 | end_page_writeback(page); |
1467 | page_cache_release(page); | |
1da177e4 LT |
1468 | FreeXid(xid); |
1469 | return rc; | |
1470 | } | |
1471 | ||
d9414774 NP |
1472 | static int cifs_write_end(struct file *file, struct address_space *mapping, |
1473 | loff_t pos, unsigned len, unsigned copied, | |
1474 | struct page *page, void *fsdata) | |
1da177e4 | 1475 | { |
d9414774 NP |
1476 | int rc; |
1477 | struct inode *inode = mapping->host; | |
1da177e4 | 1478 | |
b6b38f70 JP |
1479 | cFYI(1, "write_end for page %p from pos %lld with %d bytes", |
1480 | page, pos, copied); | |
d9414774 | 1481 | |
a98ee8c1 JL |
1482 | if (PageChecked(page)) { |
1483 | if (copied == len) | |
1484 | SetPageUptodate(page); | |
1485 | ClearPageChecked(page); | |
1486 | } else if (!PageUptodate(page) && copied == PAGE_CACHE_SIZE) | |
d9414774 | 1487 | SetPageUptodate(page); |
ad7a2926 | 1488 | |
1da177e4 | 1489 | if (!PageUptodate(page)) { |
d9414774 NP |
1490 | char *page_data; |
1491 | unsigned offset = pos & (PAGE_CACHE_SIZE - 1); | |
1492 | int xid; | |
1493 | ||
1494 | xid = GetXid(); | |
1da177e4 LT |
1495 | /* this is probably better than directly calling |
1496 | partialpage_write since in this function the file handle is | |
1497 | known which we might as well leverage */ | |
1498 | /* BB check if anything else missing out of ppw | |
1499 | such as updating last write time */ | |
1500 | page_data = kmap(page); | |
7da4b49a JL |
1501 | rc = cifs_write(file->private_data, page_data + offset, |
1502 | copied, &pos); | |
d9414774 | 1503 | /* if (rc < 0) should we set writebehind rc? */ |
1da177e4 | 1504 | kunmap(page); |
d9414774 NP |
1505 | |
1506 | FreeXid(xid); | |
fb8c4b14 | 1507 | } else { |
d9414774 NP |
1508 | rc = copied; |
1509 | pos += copied; | |
1da177e4 LT |
1510 | set_page_dirty(page); |
1511 | } | |
1512 | ||
d9414774 NP |
1513 | if (rc > 0) { |
1514 | spin_lock(&inode->i_lock); | |
1515 | if (pos > inode->i_size) | |
1516 | i_size_write(inode, pos); | |
1517 | spin_unlock(&inode->i_lock); | |
1518 | } | |
1519 | ||
1520 | unlock_page(page); | |
1521 | page_cache_release(page); | |
1522 | ||
1da177e4 LT |
1523 | return rc; |
1524 | } | |
1525 | ||
8be7e6ba | 1526 | int cifs_strict_fsync(struct file *file, int datasync) |
1da177e4 LT |
1527 | { |
1528 | int xid; | |
1529 | int rc = 0; | |
b298f223 | 1530 | struct cifsTconInfo *tcon; |
c21dfb69 | 1531 | struct cifsFileInfo *smbfile = file->private_data; |
e6a00296 | 1532 | struct inode *inode = file->f_path.dentry->d_inode; |
8be7e6ba | 1533 | struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb); |
1da177e4 LT |
1534 | |
1535 | xid = GetXid(); | |
1536 | ||
b6b38f70 | 1537 | cFYI(1, "Sync file - name: %s datasync: 0x%x", |
7ea80859 | 1538 | file->f_path.dentry->d_name.name, datasync); |
50c2f753 | 1539 | |
8be7e6ba PS |
1540 | if (!CIFS_I(inode)->clientCanCacheRead) |
1541 | cifs_invalidate_mapping(inode); | |
eb4b756b | 1542 | |
8be7e6ba PS |
1543 | tcon = tlink_tcon(smbfile->tlink); |
1544 | if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NOSSYNC)) | |
1545 | rc = CIFSSMBFlush(xid, tcon, smbfile->netfid); | |
1546 | ||
1547 | FreeXid(xid); | |
1548 | return rc; | |
1549 | } | |
1550 | ||
1551 | int cifs_fsync(struct file *file, int datasync) | |
1552 | { | |
1553 | int xid; | |
1554 | int rc = 0; | |
1555 | struct cifsTconInfo *tcon; | |
1556 | struct cifsFileInfo *smbfile = file->private_data; | |
1557 | struct cifs_sb_info *cifs_sb = CIFS_SB(file->f_path.dentry->d_sb); | |
1558 | ||
1559 | xid = GetXid(); | |
1560 | ||
1561 | cFYI(1, "Sync file - name: %s datasync: 0x%x", | |
1562 | file->f_path.dentry->d_name.name, datasync); | |
1563 | ||
1564 | tcon = tlink_tcon(smbfile->tlink); | |
1565 | if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NOSSYNC)) | |
1566 | rc = CIFSSMBFlush(xid, tcon, smbfile->netfid); | |
b298f223 | 1567 | |
1da177e4 LT |
1568 | FreeXid(xid); |
1569 | return rc; | |
1570 | } | |
1571 | ||
1da177e4 LT |
1572 | /* |
1573 | * As file closes, flush all cached write data for this inode checking | |
1574 | * for write behind errors. | |
1575 | */ | |
75e1fcc0 | 1576 | int cifs_flush(struct file *file, fl_owner_t id) |
1da177e4 | 1577 | { |
fb8c4b14 | 1578 | struct inode *inode = file->f_path.dentry->d_inode; |
1da177e4 LT |
1579 | int rc = 0; |
1580 | ||
eb4b756b | 1581 | if (file->f_mode & FMODE_WRITE) |
d3f1322a | 1582 | rc = filemap_write_and_wait(inode->i_mapping); |
50c2f753 | 1583 | |
b6b38f70 | 1584 | cFYI(1, "Flush inode %p file %p rc %d", inode, file, rc); |
1da177e4 LT |
1585 | |
1586 | return rc; | |
1587 | } | |
1588 | ||
72432ffc PS |
1589 | static int |
1590 | cifs_write_allocate_pages(struct page **pages, unsigned long num_pages) | |
1591 | { | |
1592 | int rc = 0; | |
1593 | unsigned long i; | |
1594 | ||
1595 | for (i = 0; i < num_pages; i++) { | |
1596 | pages[i] = alloc_page(__GFP_HIGHMEM); | |
1597 | if (!pages[i]) { | |
1598 | /* | |
1599 | * save number of pages we have already allocated and | |
1600 | * return with ENOMEM error | |
1601 | */ | |
1602 | num_pages = i; | |
1603 | rc = -ENOMEM; | |
1604 | goto error; | |
1605 | } | |
1606 | } | |
1607 | ||
1608 | return rc; | |
1609 | ||
1610 | error: | |
1611 | for (i = 0; i < num_pages; i++) | |
1612 | put_page(pages[i]); | |
1613 | return rc; | |
1614 | } | |
1615 | ||
1616 | static inline | |
1617 | size_t get_numpages(const size_t wsize, const size_t len, size_t *cur_len) | |
1618 | { | |
1619 | size_t num_pages; | |
1620 | size_t clen; | |
1621 | ||
1622 | clen = min_t(const size_t, len, wsize); | |
1623 | num_pages = clen / PAGE_CACHE_SIZE; | |
1624 | if (clen % PAGE_CACHE_SIZE) | |
1625 | num_pages++; | |
1626 | ||
1627 | if (cur_len) | |
1628 | *cur_len = clen; | |
1629 | ||
1630 | return num_pages; | |
1631 | } | |
1632 | ||
1633 | static ssize_t | |
1634 | cifs_iovec_write(struct file *file, const struct iovec *iov, | |
1635 | unsigned long nr_segs, loff_t *poffset) | |
1636 | { | |
76429c14 PS |
1637 | unsigned int written; |
1638 | unsigned long num_pages, npages, i; | |
1639 | size_t copied, len, cur_len; | |
1640 | ssize_t total_written = 0; | |
72432ffc PS |
1641 | struct kvec *to_send; |
1642 | struct page **pages; | |
1643 | struct iov_iter it; | |
1644 | struct inode *inode; | |
1645 | struct cifsFileInfo *open_file; | |
1646 | struct cifsTconInfo *pTcon; | |
1647 | struct cifs_sb_info *cifs_sb; | |
1648 | int xid, rc; | |
1649 | ||
1650 | len = iov_length(iov, nr_segs); | |
1651 | if (!len) | |
1652 | return 0; | |
1653 | ||
1654 | rc = generic_write_checks(file, poffset, &len, 0); | |
1655 | if (rc) | |
1656 | return rc; | |
1657 | ||
1658 | cifs_sb = CIFS_SB(file->f_path.dentry->d_sb); | |
1659 | num_pages = get_numpages(cifs_sb->wsize, len, &cur_len); | |
1660 | ||
1661 | pages = kmalloc(sizeof(struct pages *)*num_pages, GFP_KERNEL); | |
1662 | if (!pages) | |
1663 | return -ENOMEM; | |
1664 | ||
1665 | to_send = kmalloc(sizeof(struct kvec)*(num_pages + 1), GFP_KERNEL); | |
1666 | if (!to_send) { | |
1667 | kfree(pages); | |
1668 | return -ENOMEM; | |
1669 | } | |
1670 | ||
1671 | rc = cifs_write_allocate_pages(pages, num_pages); | |
1672 | if (rc) { | |
1673 | kfree(pages); | |
1674 | kfree(to_send); | |
1675 | return rc; | |
1676 | } | |
1677 | ||
1678 | xid = GetXid(); | |
1679 | open_file = file->private_data; | |
1680 | pTcon = tlink_tcon(open_file->tlink); | |
1681 | inode = file->f_path.dentry->d_inode; | |
1682 | ||
1683 | iov_iter_init(&it, iov, nr_segs, len, 0); | |
1684 | npages = num_pages; | |
1685 | ||
1686 | do { | |
1687 | size_t save_len = cur_len; | |
1688 | for (i = 0; i < npages; i++) { | |
1689 | copied = min_t(const size_t, cur_len, PAGE_CACHE_SIZE); | |
1690 | copied = iov_iter_copy_from_user(pages[i], &it, 0, | |
1691 | copied); | |
1692 | cur_len -= copied; | |
1693 | iov_iter_advance(&it, copied); | |
1694 | to_send[i+1].iov_base = kmap(pages[i]); | |
1695 | to_send[i+1].iov_len = copied; | |
1696 | } | |
1697 | ||
1698 | cur_len = save_len - cur_len; | |
1699 | ||
1700 | do { | |
1701 | if (open_file->invalidHandle) { | |
1702 | rc = cifs_reopen_file(open_file, false); | |
1703 | if (rc != 0) | |
1704 | break; | |
1705 | } | |
1706 | rc = CIFSSMBWrite2(xid, pTcon, open_file->netfid, | |
1707 | cur_len, *poffset, &written, | |
1708 | to_send, npages, 0); | |
1709 | } while (rc == -EAGAIN); | |
1710 | ||
1711 | for (i = 0; i < npages; i++) | |
1712 | kunmap(pages[i]); | |
1713 | ||
1714 | if (written) { | |
1715 | len -= written; | |
1716 | total_written += written; | |
1717 | cifs_update_eof(CIFS_I(inode), *poffset, written); | |
1718 | *poffset += written; | |
1719 | } else if (rc < 0) { | |
1720 | if (!total_written) | |
1721 | total_written = rc; | |
1722 | break; | |
1723 | } | |
1724 | ||
1725 | /* get length and number of kvecs of the next write */ | |
1726 | npages = get_numpages(cifs_sb->wsize, len, &cur_len); | |
1727 | } while (len > 0); | |
1728 | ||
1729 | if (total_written > 0) { | |
1730 | spin_lock(&inode->i_lock); | |
1731 | if (*poffset > inode->i_size) | |
1732 | i_size_write(inode, *poffset); | |
1733 | spin_unlock(&inode->i_lock); | |
1734 | } | |
1735 | ||
1736 | cifs_stats_bytes_written(pTcon, total_written); | |
1737 | mark_inode_dirty_sync(inode); | |
1738 | ||
1739 | for (i = 0; i < num_pages; i++) | |
1740 | put_page(pages[i]); | |
1741 | kfree(to_send); | |
1742 | kfree(pages); | |
1743 | FreeXid(xid); | |
1744 | return total_written; | |
1745 | } | |
1746 | ||
1747 | static ssize_t cifs_user_writev(struct kiocb *iocb, const struct iovec *iov, | |
1748 | unsigned long nr_segs, loff_t pos) | |
1749 | { | |
1750 | ssize_t written; | |
1751 | struct inode *inode; | |
1752 | ||
1753 | inode = iocb->ki_filp->f_path.dentry->d_inode; | |
1754 | ||
1755 | /* | |
1756 | * BB - optimize the way when signing is disabled. We can drop this | |
1757 | * extra memory-to-memory copying and use iovec buffers for constructing | |
1758 | * write request. | |
1759 | */ | |
1760 | ||
1761 | written = cifs_iovec_write(iocb->ki_filp, iov, nr_segs, &pos); | |
1762 | if (written > 0) { | |
1763 | CIFS_I(inode)->invalid_mapping = true; | |
1764 | iocb->ki_pos = pos; | |
1765 | } | |
1766 | ||
1767 | return written; | |
1768 | } | |
1769 | ||
1770 | ssize_t cifs_strict_writev(struct kiocb *iocb, const struct iovec *iov, | |
1771 | unsigned long nr_segs, loff_t pos) | |
1772 | { | |
1773 | struct inode *inode; | |
1774 | ||
1775 | inode = iocb->ki_filp->f_path.dentry->d_inode; | |
1776 | ||
1777 | if (CIFS_I(inode)->clientCanCacheAll) | |
1778 | return generic_file_aio_write(iocb, iov, nr_segs, pos); | |
1779 | ||
1780 | /* | |
1781 | * In strict cache mode we need to write the data to the server exactly | |
1782 | * from the pos to pos+len-1 rather than flush all affected pages | |
1783 | * because it may cause a error with mandatory locks on these pages but | |
1784 | * not on the region from pos to ppos+len-1. | |
1785 | */ | |
1786 | ||
1787 | return cifs_user_writev(iocb, iov, nr_segs, pos); | |
1788 | } | |
1789 | ||
a70307ee PS |
1790 | static ssize_t |
1791 | cifs_iovec_read(struct file *file, const struct iovec *iov, | |
1792 | unsigned long nr_segs, loff_t *poffset) | |
1da177e4 | 1793 | { |
a70307ee PS |
1794 | int rc; |
1795 | int xid; | |
76429c14 PS |
1796 | ssize_t total_read; |
1797 | unsigned int bytes_read = 0; | |
a70307ee PS |
1798 | size_t len, cur_len; |
1799 | int iov_offset = 0; | |
1da177e4 LT |
1800 | struct cifs_sb_info *cifs_sb; |
1801 | struct cifsTconInfo *pTcon; | |
1da177e4 | 1802 | struct cifsFileInfo *open_file; |
1da177e4 | 1803 | struct smb_com_read_rsp *pSMBr; |
a70307ee PS |
1804 | char *read_data; |
1805 | ||
1806 | if (!nr_segs) | |
1807 | return 0; | |
1808 | ||
1809 | len = iov_length(iov, nr_segs); | |
1810 | if (!len) | |
1811 | return 0; | |
1da177e4 LT |
1812 | |
1813 | xid = GetXid(); | |
e6a00296 | 1814 | cifs_sb = CIFS_SB(file->f_path.dentry->d_sb); |
1da177e4 | 1815 | |
c21dfb69 | 1816 | open_file = file->private_data; |
13cfb733 | 1817 | pTcon = tlink_tcon(open_file->tlink); |
1da177e4 | 1818 | |
ad7a2926 | 1819 | if ((file->f_flags & O_ACCMODE) == O_WRONLY) |
b6b38f70 | 1820 | cFYI(1, "attempting read on write only file instance"); |
ad7a2926 | 1821 | |
a70307ee PS |
1822 | for (total_read = 0; total_read < len; total_read += bytes_read) { |
1823 | cur_len = min_t(const size_t, len - total_read, cifs_sb->rsize); | |
1da177e4 | 1824 | rc = -EAGAIN; |
a70307ee PS |
1825 | read_data = NULL; |
1826 | ||
1da177e4 | 1827 | while (rc == -EAGAIN) { |
ec637e3f | 1828 | int buf_type = CIFS_NO_BUFFER; |
cdff08e7 | 1829 | if (open_file->invalidHandle) { |
15886177 | 1830 | rc = cifs_reopen_file(open_file, true); |
1da177e4 LT |
1831 | if (rc != 0) |
1832 | break; | |
1833 | } | |
a70307ee PS |
1834 | rc = CIFSSMBRead(xid, pTcon, open_file->netfid, |
1835 | cur_len, *poffset, &bytes_read, | |
1836 | &read_data, &buf_type); | |
1837 | pSMBr = (struct smb_com_read_rsp *)read_data; | |
1838 | if (read_data) { | |
1839 | char *data_offset = read_data + 4 + | |
1840 | le16_to_cpu(pSMBr->DataOffset); | |
1841 | if (memcpy_toiovecend(iov, data_offset, | |
1842 | iov_offset, bytes_read)) | |
93544cc6 | 1843 | rc = -EFAULT; |
fb8c4b14 | 1844 | if (buf_type == CIFS_SMALL_BUFFER) |
a70307ee | 1845 | cifs_small_buf_release(read_data); |
fb8c4b14 | 1846 | else if (buf_type == CIFS_LARGE_BUFFER) |
a70307ee PS |
1847 | cifs_buf_release(read_data); |
1848 | read_data = NULL; | |
1849 | iov_offset += bytes_read; | |
1da177e4 LT |
1850 | } |
1851 | } | |
a70307ee | 1852 | |
1da177e4 LT |
1853 | if (rc || (bytes_read == 0)) { |
1854 | if (total_read) { | |
1855 | break; | |
1856 | } else { | |
1857 | FreeXid(xid); | |
1858 | return rc; | |
1859 | } | |
1860 | } else { | |
a4544347 | 1861 | cifs_stats_bytes_read(pTcon, bytes_read); |
1da177e4 LT |
1862 | *poffset += bytes_read; |
1863 | } | |
1864 | } | |
a70307ee | 1865 | |
1da177e4 LT |
1866 | FreeXid(xid); |
1867 | return total_read; | |
1868 | } | |
1869 | ||
a70307ee PS |
1870 | ssize_t cifs_user_read(struct file *file, char __user *read_data, |
1871 | size_t read_size, loff_t *poffset) | |
1872 | { | |
1873 | struct iovec iov; | |
1874 | iov.iov_base = read_data; | |
1875 | iov.iov_len = read_size; | |
1876 | ||
1877 | return cifs_iovec_read(file, &iov, 1, poffset); | |
1878 | } | |
1879 | ||
1880 | static ssize_t cifs_user_readv(struct kiocb *iocb, const struct iovec *iov, | |
1881 | unsigned long nr_segs, loff_t pos) | |
1882 | { | |
1883 | ssize_t read; | |
1884 | ||
1885 | read = cifs_iovec_read(iocb->ki_filp, iov, nr_segs, &pos); | |
1886 | if (read > 0) | |
1887 | iocb->ki_pos = pos; | |
1888 | ||
1889 | return read; | |
1890 | } | |
1891 | ||
1892 | ssize_t cifs_strict_readv(struct kiocb *iocb, const struct iovec *iov, | |
1893 | unsigned long nr_segs, loff_t pos) | |
1894 | { | |
1895 | struct inode *inode; | |
1896 | ||
1897 | inode = iocb->ki_filp->f_path.dentry->d_inode; | |
1898 | ||
1899 | if (CIFS_I(inode)->clientCanCacheRead) | |
1900 | return generic_file_aio_read(iocb, iov, nr_segs, pos); | |
1901 | ||
1902 | /* | |
1903 | * In strict cache mode we need to read from the server all the time | |
1904 | * if we don't have level II oplock because the server can delay mtime | |
1905 | * change - so we can't make a decision about inode invalidating. | |
1906 | * And we can also fail with pagereading if there are mandatory locks | |
1907 | * on pages affected by this read but not on the region from pos to | |
1908 | * pos+len-1. | |
1909 | */ | |
1910 | ||
1911 | return cifs_user_readv(iocb, iov, nr_segs, pos); | |
1912 | } | |
1da177e4 LT |
1913 | |
1914 | static ssize_t cifs_read(struct file *file, char *read_data, size_t read_size, | |
a70307ee | 1915 | loff_t *poffset) |
1da177e4 LT |
1916 | { |
1917 | int rc = -EACCES; | |
1918 | unsigned int bytes_read = 0; | |
1919 | unsigned int total_read; | |
1920 | unsigned int current_read_size; | |
1921 | struct cifs_sb_info *cifs_sb; | |
1922 | struct cifsTconInfo *pTcon; | |
1923 | int xid; | |
1924 | char *current_offset; | |
1925 | struct cifsFileInfo *open_file; | |
ec637e3f | 1926 | int buf_type = CIFS_NO_BUFFER; |
1da177e4 LT |
1927 | |
1928 | xid = GetXid(); | |
e6a00296 | 1929 | cifs_sb = CIFS_SB(file->f_path.dentry->d_sb); |
1da177e4 LT |
1930 | |
1931 | if (file->private_data == NULL) { | |
0f3bc09e | 1932 | rc = -EBADF; |
1da177e4 | 1933 | FreeXid(xid); |
0f3bc09e | 1934 | return rc; |
1da177e4 | 1935 | } |
c21dfb69 | 1936 | open_file = file->private_data; |
13cfb733 | 1937 | pTcon = tlink_tcon(open_file->tlink); |
1da177e4 LT |
1938 | |
1939 | if ((file->f_flags & O_ACCMODE) == O_WRONLY) | |
b6b38f70 | 1940 | cFYI(1, "attempting read on write only file instance"); |
1da177e4 | 1941 | |
fb8c4b14 | 1942 | for (total_read = 0, current_offset = read_data; |
1da177e4 LT |
1943 | read_size > total_read; |
1944 | total_read += bytes_read, current_offset += bytes_read) { | |
1945 | current_read_size = min_t(const int, read_size - total_read, | |
1946 | cifs_sb->rsize); | |
f9f5c817 SF |
1947 | /* For windows me and 9x we do not want to request more |
1948 | than it negotiated since it will refuse the read then */ | |
fb8c4b14 | 1949 | if ((pTcon->ses) && |
f9f5c817 SF |
1950 | !(pTcon->ses->capabilities & CAP_LARGE_FILES)) { |
1951 | current_read_size = min_t(const int, current_read_size, | |
1952 | pTcon->ses->server->maxBuf - 128); | |
1953 | } | |
1da177e4 LT |
1954 | rc = -EAGAIN; |
1955 | while (rc == -EAGAIN) { | |
cdff08e7 | 1956 | if (open_file->invalidHandle) { |
15886177 | 1957 | rc = cifs_reopen_file(open_file, true); |
1da177e4 LT |
1958 | if (rc != 0) |
1959 | break; | |
1960 | } | |
bfa0d75a | 1961 | rc = CIFSSMBRead(xid, pTcon, |
ec637e3f SF |
1962 | open_file->netfid, |
1963 | current_read_size, *poffset, | |
1964 | &bytes_read, ¤t_offset, | |
1965 | &buf_type); | |
1da177e4 LT |
1966 | } |
1967 | if (rc || (bytes_read == 0)) { | |
1968 | if (total_read) { | |
1969 | break; | |
1970 | } else { | |
1971 | FreeXid(xid); | |
1972 | return rc; | |
1973 | } | |
1974 | } else { | |
a4544347 | 1975 | cifs_stats_bytes_read(pTcon, total_read); |
1da177e4 LT |
1976 | *poffset += bytes_read; |
1977 | } | |
1978 | } | |
1979 | FreeXid(xid); | |
1980 | return total_read; | |
1981 | } | |
1982 | ||
7a6a19b1 PS |
1983 | int cifs_file_strict_mmap(struct file *file, struct vm_area_struct *vma) |
1984 | { | |
1985 | int rc, xid; | |
1986 | struct inode *inode = file->f_path.dentry->d_inode; | |
1987 | ||
1988 | xid = GetXid(); | |
1989 | ||
1990 | if (!CIFS_I(inode)->clientCanCacheRead) | |
1991 | cifs_invalidate_mapping(inode); | |
1992 | ||
1993 | rc = generic_file_mmap(file, vma); | |
1994 | FreeXid(xid); | |
1995 | return rc; | |
1996 | } | |
1997 | ||
1da177e4 LT |
1998 | int cifs_file_mmap(struct file *file, struct vm_area_struct *vma) |
1999 | { | |
1da177e4 LT |
2000 | int rc, xid; |
2001 | ||
2002 | xid = GetXid(); | |
abab095d | 2003 | rc = cifs_revalidate_file(file); |
1da177e4 | 2004 | if (rc) { |
b6b38f70 | 2005 | cFYI(1, "Validation prior to mmap failed, error=%d", rc); |
1da177e4 LT |
2006 | FreeXid(xid); |
2007 | return rc; | |
2008 | } | |
2009 | rc = generic_file_mmap(file, vma); | |
2010 | FreeXid(xid); | |
2011 | return rc; | |
2012 | } | |
2013 | ||
2014 | ||
fb8c4b14 | 2015 | static void cifs_copy_cache_pages(struct address_space *mapping, |
315e995c | 2016 | struct list_head *pages, int bytes_read, char *data) |
1da177e4 LT |
2017 | { |
2018 | struct page *page; | |
2019 | char *target; | |
2020 | ||
2021 | while (bytes_read > 0) { | |
2022 | if (list_empty(pages)) | |
2023 | break; | |
2024 | ||
2025 | page = list_entry(pages->prev, struct page, lru); | |
2026 | list_del(&page->lru); | |
2027 | ||
315e995c | 2028 | if (add_to_page_cache_lru(page, mapping, page->index, |
1da177e4 LT |
2029 | GFP_KERNEL)) { |
2030 | page_cache_release(page); | |
b6b38f70 | 2031 | cFYI(1, "Add page cache failed"); |
3079ca62 SF |
2032 | data += PAGE_CACHE_SIZE; |
2033 | bytes_read -= PAGE_CACHE_SIZE; | |
1da177e4 LT |
2034 | continue; |
2035 | } | |
06b43672 | 2036 | page_cache_release(page); |
1da177e4 | 2037 | |
fb8c4b14 | 2038 | target = kmap_atomic(page, KM_USER0); |
1da177e4 LT |
2039 | |
2040 | if (PAGE_CACHE_SIZE > bytes_read) { | |
2041 | memcpy(target, data, bytes_read); | |
2042 | /* zero the tail end of this partial page */ | |
fb8c4b14 | 2043 | memset(target + bytes_read, 0, |
1da177e4 LT |
2044 | PAGE_CACHE_SIZE - bytes_read); |
2045 | bytes_read = 0; | |
2046 | } else { | |
2047 | memcpy(target, data, PAGE_CACHE_SIZE); | |
2048 | bytes_read -= PAGE_CACHE_SIZE; | |
2049 | } | |
2050 | kunmap_atomic(target, KM_USER0); | |
2051 | ||
2052 | flush_dcache_page(page); | |
2053 | SetPageUptodate(page); | |
2054 | unlock_page(page); | |
1da177e4 | 2055 | data += PAGE_CACHE_SIZE; |
9dc06558 SJ |
2056 | |
2057 | /* add page to FS-Cache */ | |
2058 | cifs_readpage_to_fscache(mapping->host, page); | |
1da177e4 LT |
2059 | } |
2060 | return; | |
2061 | } | |
2062 | ||
2063 | static int cifs_readpages(struct file *file, struct address_space *mapping, | |
2064 | struct list_head *page_list, unsigned num_pages) | |
2065 | { | |
2066 | int rc = -EACCES; | |
2067 | int xid; | |
2068 | loff_t offset; | |
2069 | struct page *page; | |
2070 | struct cifs_sb_info *cifs_sb; | |
2071 | struct cifsTconInfo *pTcon; | |
2c2130e1 | 2072 | unsigned int bytes_read = 0; |
fb8c4b14 | 2073 | unsigned int read_size, i; |
1da177e4 LT |
2074 | char *smb_read_data = NULL; |
2075 | struct smb_com_read_rsp *pSMBr; | |
1da177e4 | 2076 | struct cifsFileInfo *open_file; |
ec637e3f | 2077 | int buf_type = CIFS_NO_BUFFER; |
1da177e4 LT |
2078 | |
2079 | xid = GetXid(); | |
2080 | if (file->private_data == NULL) { | |
0f3bc09e | 2081 | rc = -EBADF; |
1da177e4 | 2082 | FreeXid(xid); |
0f3bc09e | 2083 | return rc; |
1da177e4 | 2084 | } |
c21dfb69 | 2085 | open_file = file->private_data; |
e6a00296 | 2086 | cifs_sb = CIFS_SB(file->f_path.dentry->d_sb); |
13cfb733 | 2087 | pTcon = tlink_tcon(open_file->tlink); |
bfa0d75a | 2088 | |
56698236 SJ |
2089 | /* |
2090 | * Reads as many pages as possible from fscache. Returns -ENOBUFS | |
2091 | * immediately if the cookie is negative | |
2092 | */ | |
2093 | rc = cifs_readpages_from_fscache(mapping->host, mapping, page_list, | |
2094 | &num_pages); | |
2095 | if (rc == 0) | |
2096 | goto read_complete; | |
2097 | ||
f19159dc | 2098 | cFYI(DBG2, "rpages: num pages %d", num_pages); |
1da177e4 LT |
2099 | for (i = 0; i < num_pages; ) { |
2100 | unsigned contig_pages; | |
2101 | struct page *tmp_page; | |
2102 | unsigned long expected_index; | |
2103 | ||
2104 | if (list_empty(page_list)) | |
2105 | break; | |
2106 | ||
2107 | page = list_entry(page_list->prev, struct page, lru); | |
2108 | offset = (loff_t)page->index << PAGE_CACHE_SHIFT; | |
2109 | ||
2110 | /* count adjacent pages that we will read into */ | |
2111 | contig_pages = 0; | |
fb8c4b14 | 2112 | expected_index = |
1da177e4 | 2113 | list_entry(page_list->prev, struct page, lru)->index; |
fb8c4b14 | 2114 | list_for_each_entry_reverse(tmp_page, page_list, lru) { |
1da177e4 LT |
2115 | if (tmp_page->index == expected_index) { |
2116 | contig_pages++; | |
2117 | expected_index++; | |
2118 | } else | |
fb8c4b14 | 2119 | break; |
1da177e4 LT |
2120 | } |
2121 | if (contig_pages + i > num_pages) | |
2122 | contig_pages = num_pages - i; | |
2123 | ||
2124 | /* for reads over a certain size could initiate async | |
2125 | read ahead */ | |
2126 | ||
2127 | read_size = contig_pages * PAGE_CACHE_SIZE; | |
2128 | /* Read size needs to be in multiples of one page */ | |
2129 | read_size = min_t(const unsigned int, read_size, | |
2130 | cifs_sb->rsize & PAGE_CACHE_MASK); | |
b6b38f70 JP |
2131 | cFYI(DBG2, "rpages: read size 0x%x contiguous pages %d", |
2132 | read_size, contig_pages); | |
1da177e4 LT |
2133 | rc = -EAGAIN; |
2134 | while (rc == -EAGAIN) { | |
cdff08e7 | 2135 | if (open_file->invalidHandle) { |
15886177 | 2136 | rc = cifs_reopen_file(open_file, true); |
1da177e4 LT |
2137 | if (rc != 0) |
2138 | break; | |
2139 | } | |
2140 | ||
bfa0d75a | 2141 | rc = CIFSSMBRead(xid, pTcon, |
ec637e3f SF |
2142 | open_file->netfid, |
2143 | read_size, offset, | |
2144 | &bytes_read, &smb_read_data, | |
2145 | &buf_type); | |
a9d02ad4 | 2146 | /* BB more RC checks ? */ |
fb8c4b14 | 2147 | if (rc == -EAGAIN) { |
1da177e4 | 2148 | if (smb_read_data) { |
fb8c4b14 | 2149 | if (buf_type == CIFS_SMALL_BUFFER) |
ec637e3f | 2150 | cifs_small_buf_release(smb_read_data); |
fb8c4b14 | 2151 | else if (buf_type == CIFS_LARGE_BUFFER) |
ec637e3f | 2152 | cifs_buf_release(smb_read_data); |
1da177e4 LT |
2153 | smb_read_data = NULL; |
2154 | } | |
2155 | } | |
2156 | } | |
2157 | if ((rc < 0) || (smb_read_data == NULL)) { | |
b6b38f70 | 2158 | cFYI(1, "Read error in readpages: %d", rc); |
1da177e4 LT |
2159 | break; |
2160 | } else if (bytes_read > 0) { | |
6f88cc2e | 2161 | task_io_account_read(bytes_read); |
1da177e4 LT |
2162 | pSMBr = (struct smb_com_read_rsp *)smb_read_data; |
2163 | cifs_copy_cache_pages(mapping, page_list, bytes_read, | |
2164 | smb_read_data + 4 /* RFC1001 hdr */ + | |
315e995c | 2165 | le16_to_cpu(pSMBr->DataOffset)); |
1da177e4 LT |
2166 | |
2167 | i += bytes_read >> PAGE_CACHE_SHIFT; | |
a4544347 | 2168 | cifs_stats_bytes_read(pTcon, bytes_read); |
2c2130e1 | 2169 | if ((bytes_read & PAGE_CACHE_MASK) != bytes_read) { |
1da177e4 LT |
2170 | i++; /* account for partial page */ |
2171 | ||
fb8c4b14 | 2172 | /* server copy of file can have smaller size |
1da177e4 | 2173 | than client */ |
fb8c4b14 SF |
2174 | /* BB do we need to verify this common case ? |
2175 | this case is ok - if we are at server EOF | |
1da177e4 LT |
2176 | we will hit it on next read */ |
2177 | ||
05ac9d4b | 2178 | /* break; */ |
1da177e4 LT |
2179 | } |
2180 | } else { | |
b6b38f70 | 2181 | cFYI(1, "No bytes read (%d) at offset %lld . " |
f19159dc | 2182 | "Cleaning remaining pages from readahead list", |
b6b38f70 | 2183 | bytes_read, offset); |
fb8c4b14 | 2184 | /* BB turn off caching and do new lookup on |
1da177e4 | 2185 | file size at server? */ |
1da177e4 LT |
2186 | break; |
2187 | } | |
2188 | if (smb_read_data) { | |
fb8c4b14 | 2189 | if (buf_type == CIFS_SMALL_BUFFER) |
ec637e3f | 2190 | cifs_small_buf_release(smb_read_data); |
fb8c4b14 | 2191 | else if (buf_type == CIFS_LARGE_BUFFER) |
ec637e3f | 2192 | cifs_buf_release(smb_read_data); |
1da177e4 LT |
2193 | smb_read_data = NULL; |
2194 | } | |
2195 | bytes_read = 0; | |
2196 | } | |
2197 | ||
1da177e4 LT |
2198 | /* need to free smb_read_data buf before exit */ |
2199 | if (smb_read_data) { | |
fb8c4b14 | 2200 | if (buf_type == CIFS_SMALL_BUFFER) |
47c886b3 | 2201 | cifs_small_buf_release(smb_read_data); |
fb8c4b14 | 2202 | else if (buf_type == CIFS_LARGE_BUFFER) |
47c886b3 | 2203 | cifs_buf_release(smb_read_data); |
1da177e4 | 2204 | smb_read_data = NULL; |
fb8c4b14 | 2205 | } |
1da177e4 | 2206 | |
56698236 | 2207 | read_complete: |
1da177e4 LT |
2208 | FreeXid(xid); |
2209 | return rc; | |
2210 | } | |
2211 | ||
2212 | static int cifs_readpage_worker(struct file *file, struct page *page, | |
2213 | loff_t *poffset) | |
2214 | { | |
2215 | char *read_data; | |
2216 | int rc; | |
2217 | ||
56698236 SJ |
2218 | /* Is the page cached? */ |
2219 | rc = cifs_readpage_from_fscache(file->f_path.dentry->d_inode, page); | |
2220 | if (rc == 0) | |
2221 | goto read_complete; | |
2222 | ||
1da177e4 LT |
2223 | page_cache_get(page); |
2224 | read_data = kmap(page); | |
2225 | /* for reads over a certain size could initiate async read ahead */ | |
fb8c4b14 | 2226 | |
1da177e4 | 2227 | rc = cifs_read(file, read_data, PAGE_CACHE_SIZE, poffset); |
fb8c4b14 | 2228 | |
1da177e4 LT |
2229 | if (rc < 0) |
2230 | goto io_error; | |
2231 | else | |
b6b38f70 | 2232 | cFYI(1, "Bytes read %d", rc); |
fb8c4b14 | 2233 | |
e6a00296 JJS |
2234 | file->f_path.dentry->d_inode->i_atime = |
2235 | current_fs_time(file->f_path.dentry->d_inode->i_sb); | |
fb8c4b14 | 2236 | |
1da177e4 LT |
2237 | if (PAGE_CACHE_SIZE > rc) |
2238 | memset(read_data + rc, 0, PAGE_CACHE_SIZE - rc); | |
2239 | ||
2240 | flush_dcache_page(page); | |
2241 | SetPageUptodate(page); | |
9dc06558 SJ |
2242 | |
2243 | /* send this page to the cache */ | |
2244 | cifs_readpage_to_fscache(file->f_path.dentry->d_inode, page); | |
2245 | ||
1da177e4 | 2246 | rc = 0; |
fb8c4b14 | 2247 | |
1da177e4 | 2248 | io_error: |
fb8c4b14 | 2249 | kunmap(page); |
1da177e4 | 2250 | page_cache_release(page); |
56698236 SJ |
2251 | |
2252 | read_complete: | |
1da177e4 LT |
2253 | return rc; |
2254 | } | |
2255 | ||
2256 | static int cifs_readpage(struct file *file, struct page *page) | |
2257 | { | |
2258 | loff_t offset = (loff_t)page->index << PAGE_CACHE_SHIFT; | |
2259 | int rc = -EACCES; | |
2260 | int xid; | |
2261 | ||
2262 | xid = GetXid(); | |
2263 | ||
2264 | if (file->private_data == NULL) { | |
0f3bc09e | 2265 | rc = -EBADF; |
1da177e4 | 2266 | FreeXid(xid); |
0f3bc09e | 2267 | return rc; |
1da177e4 LT |
2268 | } |
2269 | ||
b6b38f70 JP |
2270 | cFYI(1, "readpage %p at offset %d 0x%x\n", |
2271 | page, (int)offset, (int)offset); | |
1da177e4 LT |
2272 | |
2273 | rc = cifs_readpage_worker(file, page, &offset); | |
2274 | ||
2275 | unlock_page(page); | |
2276 | ||
2277 | FreeXid(xid); | |
2278 | return rc; | |
2279 | } | |
2280 | ||
a403a0a3 SF |
2281 | static int is_inode_writable(struct cifsInodeInfo *cifs_inode) |
2282 | { | |
2283 | struct cifsFileInfo *open_file; | |
2284 | ||
4477288a | 2285 | spin_lock(&cifs_file_list_lock); |
a403a0a3 | 2286 | list_for_each_entry(open_file, &cifs_inode->openFileList, flist) { |
2e396b83 | 2287 | if (OPEN_FMODE(open_file->f_flags) & FMODE_WRITE) { |
4477288a | 2288 | spin_unlock(&cifs_file_list_lock); |
a403a0a3 SF |
2289 | return 1; |
2290 | } | |
2291 | } | |
4477288a | 2292 | spin_unlock(&cifs_file_list_lock); |
a403a0a3 SF |
2293 | return 0; |
2294 | } | |
2295 | ||
1da177e4 LT |
2296 | /* We do not want to update the file size from server for inodes |
2297 | open for write - to avoid races with writepage extending | |
2298 | the file - in the future we could consider allowing | |
fb8c4b14 | 2299 | refreshing the inode only on increases in the file size |
1da177e4 LT |
2300 | but this is tricky to do without racing with writebehind |
2301 | page caching in the current Linux kernel design */ | |
4b18f2a9 | 2302 | bool is_size_safe_to_change(struct cifsInodeInfo *cifsInode, __u64 end_of_file) |
1da177e4 | 2303 | { |
a403a0a3 | 2304 | if (!cifsInode) |
4b18f2a9 | 2305 | return true; |
50c2f753 | 2306 | |
a403a0a3 SF |
2307 | if (is_inode_writable(cifsInode)) { |
2308 | /* This inode is open for write at least once */ | |
c32a0b68 SF |
2309 | struct cifs_sb_info *cifs_sb; |
2310 | ||
c32a0b68 | 2311 | cifs_sb = CIFS_SB(cifsInode->vfs_inode.i_sb); |
ad7a2926 | 2312 | if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DIRECT_IO) { |
fb8c4b14 | 2313 | /* since no page cache to corrupt on directio |
c32a0b68 | 2314 | we can change size safely */ |
4b18f2a9 | 2315 | return true; |
c32a0b68 SF |
2316 | } |
2317 | ||
fb8c4b14 | 2318 | if (i_size_read(&cifsInode->vfs_inode) < end_of_file) |
4b18f2a9 | 2319 | return true; |
7ba52631 | 2320 | |
4b18f2a9 | 2321 | return false; |
23e7dd7d | 2322 | } else |
4b18f2a9 | 2323 | return true; |
1da177e4 LT |
2324 | } |
2325 | ||
d9414774 NP |
2326 | static int cifs_write_begin(struct file *file, struct address_space *mapping, |
2327 | loff_t pos, unsigned len, unsigned flags, | |
2328 | struct page **pagep, void **fsdata) | |
1da177e4 | 2329 | { |
d9414774 NP |
2330 | pgoff_t index = pos >> PAGE_CACHE_SHIFT; |
2331 | loff_t offset = pos & (PAGE_CACHE_SIZE - 1); | |
a98ee8c1 JL |
2332 | loff_t page_start = pos & PAGE_MASK; |
2333 | loff_t i_size; | |
2334 | struct page *page; | |
2335 | int rc = 0; | |
d9414774 | 2336 | |
b6b38f70 | 2337 | cFYI(1, "write_begin from %lld len %d", (long long)pos, len); |
d9414774 | 2338 | |
54566b2c | 2339 | page = grab_cache_page_write_begin(mapping, index, flags); |
a98ee8c1 JL |
2340 | if (!page) { |
2341 | rc = -ENOMEM; | |
2342 | goto out; | |
2343 | } | |
8a236264 | 2344 | |
a98ee8c1 JL |
2345 | if (PageUptodate(page)) |
2346 | goto out; | |
8a236264 | 2347 | |
a98ee8c1 JL |
2348 | /* |
2349 | * If we write a full page it will be up to date, no need to read from | |
2350 | * the server. If the write is short, we'll end up doing a sync write | |
2351 | * instead. | |
2352 | */ | |
2353 | if (len == PAGE_CACHE_SIZE) | |
2354 | goto out; | |
8a236264 | 2355 | |
a98ee8c1 JL |
2356 | /* |
2357 | * optimize away the read when we have an oplock, and we're not | |
2358 | * expecting to use any of the data we'd be reading in. That | |
2359 | * is, when the page lies beyond the EOF, or straddles the EOF | |
2360 | * and the write will cover all of the existing data. | |
2361 | */ | |
2362 | if (CIFS_I(mapping->host)->clientCanCacheRead) { | |
2363 | i_size = i_size_read(mapping->host); | |
2364 | if (page_start >= i_size || | |
2365 | (offset == 0 && (pos + len) >= i_size)) { | |
2366 | zero_user_segments(page, 0, offset, | |
2367 | offset + len, | |
2368 | PAGE_CACHE_SIZE); | |
2369 | /* | |
2370 | * PageChecked means that the parts of the page | |
2371 | * to which we're not writing are considered up | |
2372 | * to date. Once the data is copied to the | |
2373 | * page, it can be set uptodate. | |
2374 | */ | |
2375 | SetPageChecked(page); | |
2376 | goto out; | |
2377 | } | |
2378 | } | |
d9414774 | 2379 | |
a98ee8c1 JL |
2380 | if ((file->f_flags & O_ACCMODE) != O_WRONLY) { |
2381 | /* | |
2382 | * might as well read a page, it is fast enough. If we get | |
2383 | * an error, we don't need to return it. cifs_write_end will | |
2384 | * do a sync write instead since PG_uptodate isn't set. | |
2385 | */ | |
2386 | cifs_readpage_worker(file, page, &page_start); | |
8a236264 SF |
2387 | } else { |
2388 | /* we could try using another file handle if there is one - | |
2389 | but how would we lock it to prevent close of that handle | |
2390 | racing with this read? In any case | |
d9414774 | 2391 | this will be written out by write_end so is fine */ |
1da177e4 | 2392 | } |
a98ee8c1 JL |
2393 | out: |
2394 | *pagep = page; | |
2395 | return rc; | |
1da177e4 LT |
2396 | } |
2397 | ||
85f2d6b4 SJ |
2398 | static int cifs_release_page(struct page *page, gfp_t gfp) |
2399 | { | |
2400 | if (PagePrivate(page)) | |
2401 | return 0; | |
2402 | ||
2403 | return cifs_fscache_release_page(page, gfp); | |
2404 | } | |
2405 | ||
2406 | static void cifs_invalidate_page(struct page *page, unsigned long offset) | |
2407 | { | |
2408 | struct cifsInodeInfo *cifsi = CIFS_I(page->mapping->host); | |
2409 | ||
2410 | if (offset == 0) | |
2411 | cifs_fscache_invalidate_page(page, &cifsi->vfs_inode); | |
2412 | } | |
2413 | ||
9b646972 | 2414 | void cifs_oplock_break(struct work_struct *work) |
3bc303c2 JL |
2415 | { |
2416 | struct cifsFileInfo *cfile = container_of(work, struct cifsFileInfo, | |
2417 | oplock_break); | |
a5e18bc3 | 2418 | struct inode *inode = cfile->dentry->d_inode; |
3bc303c2 | 2419 | struct cifsInodeInfo *cinode = CIFS_I(inode); |
eb4b756b | 2420 | int rc = 0; |
3bc303c2 JL |
2421 | |
2422 | if (inode && S_ISREG(inode->i_mode)) { | |
d54ff732 | 2423 | if (cinode->clientCanCacheRead) |
8737c930 | 2424 | break_lease(inode, O_RDONLY); |
d54ff732 | 2425 | else |
8737c930 | 2426 | break_lease(inode, O_WRONLY); |
3bc303c2 JL |
2427 | rc = filemap_fdatawrite(inode->i_mapping); |
2428 | if (cinode->clientCanCacheRead == 0) { | |
eb4b756b JL |
2429 | rc = filemap_fdatawait(inode->i_mapping); |
2430 | mapping_set_error(inode->i_mapping, rc); | |
3bc303c2 JL |
2431 | invalidate_remote_inode(inode); |
2432 | } | |
b6b38f70 | 2433 | cFYI(1, "Oplock flush inode %p rc %d", inode, rc); |
3bc303c2 JL |
2434 | } |
2435 | ||
2436 | /* | |
2437 | * releasing stale oplock after recent reconnect of smb session using | |
2438 | * a now incorrect file handle is not a data integrity issue but do | |
2439 | * not bother sending an oplock release if session to server still is | |
2440 | * disconnected since oplock already released by the server | |
2441 | */ | |
cdff08e7 | 2442 | if (!cfile->oplock_break_cancelled) { |
13cfb733 | 2443 | rc = CIFSSMBLock(0, tlink_tcon(cfile->tlink), cfile->netfid, 0, |
12fed00d PS |
2444 | 0, 0, 0, LOCKING_ANDX_OPLOCK_RELEASE, false, |
2445 | cinode->clientCanCacheRead ? 1 : 0); | |
b6b38f70 | 2446 | cFYI(1, "Oplock release rc = %d", rc); |
3bc303c2 | 2447 | } |
9b646972 TH |
2448 | |
2449 | /* | |
2450 | * We might have kicked in before is_valid_oplock_break() | |
2451 | * finished grabbing reference for us. Make sure it's done by | |
6573e9b7 | 2452 | * waiting for cifs_file_list_lock. |
9b646972 | 2453 | */ |
4477288a JL |
2454 | spin_lock(&cifs_file_list_lock); |
2455 | spin_unlock(&cifs_file_list_lock); | |
9b646972 TH |
2456 | |
2457 | cifs_oplock_break_put(cfile); | |
3bc303c2 JL |
2458 | } |
2459 | ||
5f6dbc9e | 2460 | /* must be called while holding cifs_file_list_lock */ |
9b646972 | 2461 | void cifs_oplock_break_get(struct cifsFileInfo *cfile) |
3bc303c2 | 2462 | { |
d7c86ff8 | 2463 | cifs_sb_active(cfile->dentry->d_sb); |
3bc303c2 | 2464 | cifsFileInfo_get(cfile); |
3bc303c2 JL |
2465 | } |
2466 | ||
9b646972 | 2467 | void cifs_oplock_break_put(struct cifsFileInfo *cfile) |
3bc303c2 | 2468 | { |
ebe2e91e JL |
2469 | struct super_block *sb = cfile->dentry->d_sb; |
2470 | ||
3bc303c2 | 2471 | cifsFileInfo_put(cfile); |
ebe2e91e | 2472 | cifs_sb_deactive(sb); |
3bc303c2 JL |
2473 | } |
2474 | ||
f5e54d6e | 2475 | const struct address_space_operations cifs_addr_ops = { |
1da177e4 LT |
2476 | .readpage = cifs_readpage, |
2477 | .readpages = cifs_readpages, | |
2478 | .writepage = cifs_writepage, | |
37c0eb46 | 2479 | .writepages = cifs_writepages, |
d9414774 NP |
2480 | .write_begin = cifs_write_begin, |
2481 | .write_end = cifs_write_end, | |
1da177e4 | 2482 | .set_page_dirty = __set_page_dirty_nobuffers, |
85f2d6b4 SJ |
2483 | .releasepage = cifs_release_page, |
2484 | .invalidatepage = cifs_invalidate_page, | |
1da177e4 LT |
2485 | /* .direct_IO = */ |
2486 | }; | |
273d81d6 DK |
2487 | |
2488 | /* | |
2489 | * cifs_readpages requires the server to support a buffer large enough to | |
2490 | * contain the header plus one complete page of data. Otherwise, we need | |
2491 | * to leave cifs_readpages out of the address space operations. | |
2492 | */ | |
f5e54d6e | 2493 | const struct address_space_operations cifs_addr_ops_smallbuf = { |
273d81d6 DK |
2494 | .readpage = cifs_readpage, |
2495 | .writepage = cifs_writepage, | |
2496 | .writepages = cifs_writepages, | |
d9414774 NP |
2497 | .write_begin = cifs_write_begin, |
2498 | .write_end = cifs_write_end, | |
273d81d6 | 2499 | .set_page_dirty = __set_page_dirty_nobuffers, |
85f2d6b4 SJ |
2500 | .releasepage = cifs_release_page, |
2501 | .invalidatepage = cifs_invalidate_page, | |
273d81d6 DK |
2502 | /* .direct_IO = */ |
2503 | }; |