Commit | Line | Data |
---|---|---|
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 | struct cifsInodeInfo *pCifsInode; |
1da177e4 | 350 | char *full_path = NULL; |
7e12eddb | 351 | bool posix_open_ok = false; |
1da177e4 | 352 | __u16 netfid; |
1da177e4 LT |
353 | |
354 | xid = GetXid(); | |
355 | ||
356 | cifs_sb = CIFS_SB(inode->i_sb); | |
7ffec372 JL |
357 | tlink = cifs_sb_tlink(cifs_sb); |
358 | if (IS_ERR(tlink)) { | |
359 | FreeXid(xid); | |
360 | return PTR_ERR(tlink); | |
361 | } | |
362 | tcon = tlink_tcon(tlink); | |
1da177e4 | 363 | |
a6ce4932 | 364 | pCifsInode = CIFS_I(file->f_path.dentry->d_inode); |
1da177e4 | 365 | |
e6a00296 | 366 | full_path = build_path_from_dentry(file->f_path.dentry); |
1da177e4 | 367 | if (full_path == NULL) { |
0f3bc09e | 368 | rc = -ENOMEM; |
232341ba | 369 | goto out; |
1da177e4 LT |
370 | } |
371 | ||
b6b38f70 JP |
372 | cFYI(1, "inode = 0x%p file flags are 0x%x for %s", |
373 | inode, file->f_flags, full_path); | |
276a74a4 SF |
374 | |
375 | if (oplockEnabled) | |
376 | oplock = REQ_OPLOCK; | |
377 | else | |
378 | oplock = 0; | |
379 | ||
64cc2c63 SF |
380 | if (!tcon->broken_posix_open && tcon->unix_ext && |
381 | (tcon->ses->capabilities & CAP_UNIX) && | |
276a74a4 SF |
382 | (CIFS_UNIX_POSIX_PATH_OPS_CAP & |
383 | le64_to_cpu(tcon->fsUnixInfo.Capability))) { | |
276a74a4 | 384 | /* can not refresh inode info since size could be stale */ |
2422f676 | 385 | rc = cifs_posix_open(full_path, &inode, inode->i_sb, |
fa588e0c | 386 | cifs_sb->mnt_file_mode /* ignored */, |
608712fe | 387 | file->f_flags, &oplock, &netfid, xid); |
276a74a4 | 388 | if (rc == 0) { |
b6b38f70 | 389 | cFYI(1, "posix open succeeded"); |
7e12eddb | 390 | posix_open_ok = true; |
64cc2c63 SF |
391 | } else if ((rc == -EINVAL) || (rc == -EOPNOTSUPP)) { |
392 | if (tcon->ses->serverNOS) | |
b6b38f70 | 393 | cERROR(1, "server %s of type %s returned" |
64cc2c63 SF |
394 | " unexpected error on SMB posix open" |
395 | ", disabling posix open support." | |
396 | " Check if server update available.", | |
397 | tcon->ses->serverName, | |
b6b38f70 | 398 | tcon->ses->serverNOS); |
64cc2c63 | 399 | tcon->broken_posix_open = true; |
276a74a4 SF |
400 | } else if ((rc != -EIO) && (rc != -EREMOTE) && |
401 | (rc != -EOPNOTSUPP)) /* path not found or net err */ | |
402 | goto out; | |
64cc2c63 SF |
403 | /* else fallthrough to retry open the old way on network i/o |
404 | or DFS errors */ | |
276a74a4 SF |
405 | } |
406 | ||
7e12eddb PS |
407 | if (!posix_open_ok) { |
408 | rc = cifs_nt_open(full_path, inode, cifs_sb, tcon, | |
409 | file->f_flags, &oplock, &netfid, xid); | |
410 | if (rc) | |
411 | goto out; | |
412 | } | |
47c78b7f | 413 | |
abfe1eed | 414 | pCifsFile = cifs_new_fileinfo(netfid, file, tlink, oplock); |
6ca9f3ba | 415 | if (pCifsFile == NULL) { |
7e12eddb | 416 | CIFSSMBClose(xid, tcon, netfid); |
1da177e4 LT |
417 | rc = -ENOMEM; |
418 | goto out; | |
419 | } | |
1da177e4 | 420 | |
9451a9a5 SJ |
421 | cifs_fscache_set_inode_cookie(inode, file); |
422 | ||
7e12eddb | 423 | if ((oplock & CIFS_CREATE_ACTION) && !posix_open_ok && tcon->unix_ext) { |
1da177e4 LT |
424 | /* time to set mode which we can not set earlier due to |
425 | problems creating new read-only files */ | |
7e12eddb PS |
426 | struct cifs_unix_set_info_args args = { |
427 | .mode = inode->i_mode, | |
428 | .uid = NO_CHANGE_64, | |
429 | .gid = NO_CHANGE_64, | |
430 | .ctime = NO_CHANGE_64, | |
431 | .atime = NO_CHANGE_64, | |
432 | .mtime = NO_CHANGE_64, | |
433 | .device = 0, | |
434 | }; | |
d44a9fe2 JL |
435 | CIFSSMBUnixSetFileInfo(xid, tcon, &args, netfid, |
436 | pCifsFile->pid); | |
1da177e4 LT |
437 | } |
438 | ||
439 | out: | |
1da177e4 LT |
440 | kfree(full_path); |
441 | FreeXid(xid); | |
7ffec372 | 442 | cifs_put_tlink(tlink); |
1da177e4 LT |
443 | return rc; |
444 | } | |
445 | ||
0418726b | 446 | /* Try to reacquire byte range locks that were released when session */ |
1da177e4 LT |
447 | /* to server was lost */ |
448 | static int cifs_relock_file(struct cifsFileInfo *cifsFile) | |
449 | { | |
450 | int rc = 0; | |
451 | ||
452 | /* BB list all locks open on this file and relock */ | |
453 | ||
454 | return rc; | |
455 | } | |
456 | ||
15886177 | 457 | static int cifs_reopen_file(struct cifsFileInfo *pCifsFile, bool can_flush) |
1da177e4 LT |
458 | { |
459 | int rc = -EACCES; | |
590a3fe0 JL |
460 | int xid; |
461 | __u32 oplock; | |
1da177e4 | 462 | struct cifs_sb_info *cifs_sb; |
7fc8f4e9 | 463 | struct cifsTconInfo *tcon; |
1da177e4 | 464 | struct cifsInodeInfo *pCifsInode; |
fb8c4b14 | 465 | struct inode *inode; |
1da177e4 LT |
466 | char *full_path = NULL; |
467 | int desiredAccess; | |
468 | int disposition = FILE_OPEN; | |
469 | __u16 netfid; | |
470 | ||
1da177e4 | 471 | xid = GetXid(); |
f0a71eb8 | 472 | mutex_lock(&pCifsFile->fh_mutex); |
4b18f2a9 | 473 | if (!pCifsFile->invalidHandle) { |
f0a71eb8 | 474 | mutex_unlock(&pCifsFile->fh_mutex); |
0f3bc09e | 475 | rc = 0; |
1da177e4 | 476 | FreeXid(xid); |
0f3bc09e | 477 | return rc; |
1da177e4 LT |
478 | } |
479 | ||
15886177 | 480 | inode = pCifsFile->dentry->d_inode; |
1da177e4 | 481 | cifs_sb = CIFS_SB(inode->i_sb); |
13cfb733 | 482 | tcon = tlink_tcon(pCifsFile->tlink); |
3a9f462f | 483 | |
1da177e4 LT |
484 | /* can not grab rename sem here because various ops, including |
485 | those that already have the rename sem can end up causing writepage | |
486 | to get called and if the server was down that means we end up here, | |
487 | and we can never tell if the caller already has the rename_sem */ | |
15886177 | 488 | full_path = build_path_from_dentry(pCifsFile->dentry); |
1da177e4 | 489 | if (full_path == NULL) { |
3a9f462f | 490 | rc = -ENOMEM; |
f0a71eb8 | 491 | mutex_unlock(&pCifsFile->fh_mutex); |
1da177e4 | 492 | FreeXid(xid); |
3a9f462f | 493 | return rc; |
1da177e4 LT |
494 | } |
495 | ||
b6b38f70 | 496 | cFYI(1, "inode = 0x%p file flags 0x%x for %s", |
15886177 | 497 | inode, pCifsFile->f_flags, full_path); |
1da177e4 LT |
498 | |
499 | if (oplockEnabled) | |
500 | oplock = REQ_OPLOCK; | |
501 | else | |
4b18f2a9 | 502 | oplock = 0; |
1da177e4 | 503 | |
7fc8f4e9 SF |
504 | if (tcon->unix_ext && (tcon->ses->capabilities & CAP_UNIX) && |
505 | (CIFS_UNIX_POSIX_PATH_OPS_CAP & | |
506 | le64_to_cpu(tcon->fsUnixInfo.Capability))) { | |
608712fe JL |
507 | |
508 | /* | |
509 | * O_CREAT, O_EXCL and O_TRUNC already had their effect on the | |
510 | * original open. Must mask them off for a reopen. | |
511 | */ | |
15886177 JL |
512 | unsigned int oflags = pCifsFile->f_flags & |
513 | ~(O_CREAT | O_EXCL | O_TRUNC); | |
608712fe | 514 | |
2422f676 | 515 | rc = cifs_posix_open(full_path, NULL, inode->i_sb, |
fa588e0c SF |
516 | cifs_sb->mnt_file_mode /* ignored */, |
517 | oflags, &oplock, &netfid, xid); | |
7fc8f4e9 | 518 | if (rc == 0) { |
b6b38f70 | 519 | cFYI(1, "posix reopen succeeded"); |
7fc8f4e9 SF |
520 | goto reopen_success; |
521 | } | |
522 | /* fallthrough to retry open the old way on errors, especially | |
523 | in the reconnect path it is important to retry hard */ | |
524 | } | |
525 | ||
15886177 | 526 | desiredAccess = cifs_convert_flags(pCifsFile->f_flags); |
7fc8f4e9 | 527 | |
1da177e4 | 528 | /* Can not refresh inode by passing in file_info buf to be returned |
fb8c4b14 SF |
529 | by SMBOpen and then calling get_inode_info with returned buf |
530 | since file might have write behind data that needs to be flushed | |
1da177e4 LT |
531 | and server version of file size can be stale. If we knew for sure |
532 | that inode was not dirty locally we could do this */ | |
533 | ||
7fc8f4e9 | 534 | rc = CIFSSMBOpen(xid, tcon, full_path, disposition, desiredAccess, |
1da177e4 | 535 | CREATE_NOT_DIR, &netfid, &oplock, NULL, |
fb8c4b14 | 536 | cifs_sb->local_nls, cifs_sb->mnt_cifs_flags & |
737b758c | 537 | CIFS_MOUNT_MAP_SPECIAL_CHR); |
1da177e4 | 538 | if (rc) { |
f0a71eb8 | 539 | mutex_unlock(&pCifsFile->fh_mutex); |
b6b38f70 JP |
540 | cFYI(1, "cifs_open returned 0x%x", rc); |
541 | cFYI(1, "oplock: %d", oplock); | |
15886177 JL |
542 | goto reopen_error_exit; |
543 | } | |
544 | ||
7fc8f4e9 | 545 | reopen_success: |
15886177 JL |
546 | pCifsFile->netfid = netfid; |
547 | pCifsFile->invalidHandle = false; | |
548 | mutex_unlock(&pCifsFile->fh_mutex); | |
549 | pCifsInode = CIFS_I(inode); | |
550 | ||
551 | if (can_flush) { | |
552 | rc = filemap_write_and_wait(inode->i_mapping); | |
eb4b756b | 553 | mapping_set_error(inode->i_mapping, rc); |
15886177 | 554 | |
15886177 JL |
555 | if (tcon->unix_ext) |
556 | rc = cifs_get_inode_info_unix(&inode, | |
557 | full_path, inode->i_sb, xid); | |
558 | else | |
559 | rc = cifs_get_inode_info(&inode, | |
560 | full_path, NULL, inode->i_sb, | |
561 | xid, NULL); | |
562 | } /* else we are writing out data to server already | |
563 | and could deadlock if we tried to flush data, and | |
564 | since we do not know if we have data that would | |
565 | invalidate the current end of file on the server | |
566 | we can not go to the server to get the new inod | |
567 | info */ | |
e66673e3 | 568 | |
c6723628 | 569 | cifs_set_oplock_level(pCifsInode, oplock); |
e66673e3 | 570 | |
15886177 JL |
571 | cifs_relock_file(pCifsFile); |
572 | ||
573 | reopen_error_exit: | |
1da177e4 LT |
574 | kfree(full_path); |
575 | FreeXid(xid); | |
576 | return rc; | |
577 | } | |
578 | ||
579 | int cifs_close(struct inode *inode, struct file *file) | |
580 | { | |
cdff08e7 SF |
581 | cifsFileInfo_put(file->private_data); |
582 | file->private_data = NULL; | |
7ee1af76 | 583 | |
cdff08e7 SF |
584 | /* return code from the ->release op is always ignored */ |
585 | return 0; | |
1da177e4 LT |
586 | } |
587 | ||
588 | int cifs_closedir(struct inode *inode, struct file *file) | |
589 | { | |
590 | int rc = 0; | |
591 | int xid; | |
c21dfb69 | 592 | struct cifsFileInfo *pCFileStruct = file->private_data; |
1da177e4 LT |
593 | char *ptmp; |
594 | ||
b6b38f70 | 595 | cFYI(1, "Closedir inode = 0x%p", inode); |
1da177e4 LT |
596 | |
597 | xid = GetXid(); | |
598 | ||
599 | if (pCFileStruct) { | |
13cfb733 | 600 | struct cifsTconInfo *pTcon = tlink_tcon(pCFileStruct->tlink); |
1da177e4 | 601 | |
b6b38f70 | 602 | cFYI(1, "Freeing private data in close dir"); |
4477288a | 603 | spin_lock(&cifs_file_list_lock); |
4b18f2a9 SF |
604 | if (!pCFileStruct->srch_inf.endOfSearch && |
605 | !pCFileStruct->invalidHandle) { | |
606 | pCFileStruct->invalidHandle = true; | |
4477288a | 607 | spin_unlock(&cifs_file_list_lock); |
1da177e4 | 608 | rc = CIFSFindClose(xid, pTcon, pCFileStruct->netfid); |
b6b38f70 JP |
609 | cFYI(1, "Closing uncompleted readdir with rc %d", |
610 | rc); | |
1da177e4 LT |
611 | /* not much we can do if it fails anyway, ignore rc */ |
612 | rc = 0; | |
ddb4cbfc | 613 | } else |
4477288a | 614 | spin_unlock(&cifs_file_list_lock); |
1da177e4 LT |
615 | ptmp = pCFileStruct->srch_inf.ntwrk_buf_start; |
616 | if (ptmp) { | |
b6b38f70 | 617 | cFYI(1, "closedir free smb buf in srch struct"); |
1da177e4 | 618 | pCFileStruct->srch_inf.ntwrk_buf_start = NULL; |
fb8c4b14 | 619 | if (pCFileStruct->srch_inf.smallBuf) |
d47d7c1a SF |
620 | cifs_small_buf_release(ptmp); |
621 | else | |
622 | cifs_buf_release(ptmp); | |
1da177e4 | 623 | } |
13cfb733 | 624 | cifs_put_tlink(pCFileStruct->tlink); |
1da177e4 LT |
625 | kfree(file->private_data); |
626 | file->private_data = NULL; | |
627 | } | |
628 | /* BB can we lock the filestruct while this is going on? */ | |
629 | FreeXid(xid); | |
630 | return rc; | |
631 | } | |
632 | ||
7ee1af76 JA |
633 | static int store_file_lock(struct cifsFileInfo *fid, __u64 len, |
634 | __u64 offset, __u8 lockType) | |
635 | { | |
fb8c4b14 SF |
636 | struct cifsLockInfo *li = |
637 | kmalloc(sizeof(struct cifsLockInfo), GFP_KERNEL); | |
7ee1af76 JA |
638 | if (li == NULL) |
639 | return -ENOMEM; | |
640 | li->offset = offset; | |
641 | li->length = len; | |
642 | li->type = lockType; | |
796e5661 | 643 | mutex_lock(&fid->lock_mutex); |
7ee1af76 | 644 | list_add(&li->llist, &fid->llist); |
796e5661 | 645 | mutex_unlock(&fid->lock_mutex); |
7ee1af76 JA |
646 | return 0; |
647 | } | |
648 | ||
1da177e4 LT |
649 | int cifs_lock(struct file *file, int cmd, struct file_lock *pfLock) |
650 | { | |
651 | int rc, xid; | |
1da177e4 LT |
652 | __u32 numLock = 0; |
653 | __u32 numUnlock = 0; | |
654 | __u64 length; | |
4b18f2a9 | 655 | bool wait_flag = false; |
1da177e4 | 656 | struct cifs_sb_info *cifs_sb; |
13a6e42a | 657 | struct cifsTconInfo *tcon; |
08547b03 SF |
658 | __u16 netfid; |
659 | __u8 lockType = LOCKING_ANDX_LARGE_FILES; | |
13a6e42a | 660 | bool posix_locking = 0; |
1da177e4 LT |
661 | |
662 | length = 1 + pfLock->fl_end - pfLock->fl_start; | |
663 | rc = -EACCES; | |
664 | xid = GetXid(); | |
665 | ||
b6b38f70 | 666 | cFYI(1, "Lock parm: 0x%x flockflags: " |
1da177e4 | 667 | "0x%x flocktype: 0x%x start: %lld end: %lld", |
fb8c4b14 | 668 | cmd, pfLock->fl_flags, pfLock->fl_type, pfLock->fl_start, |
b6b38f70 | 669 | pfLock->fl_end); |
1da177e4 LT |
670 | |
671 | if (pfLock->fl_flags & FL_POSIX) | |
b6b38f70 | 672 | cFYI(1, "Posix"); |
1da177e4 | 673 | if (pfLock->fl_flags & FL_FLOCK) |
b6b38f70 | 674 | cFYI(1, "Flock"); |
1da177e4 | 675 | if (pfLock->fl_flags & FL_SLEEP) { |
b6b38f70 | 676 | cFYI(1, "Blocking lock"); |
4b18f2a9 | 677 | wait_flag = true; |
1da177e4 LT |
678 | } |
679 | if (pfLock->fl_flags & FL_ACCESS) | |
b6b38f70 JP |
680 | cFYI(1, "Process suspended by mandatory locking - " |
681 | "not implemented yet"); | |
1da177e4 | 682 | if (pfLock->fl_flags & FL_LEASE) |
b6b38f70 | 683 | cFYI(1, "Lease on file - not implemented yet"); |
fb8c4b14 | 684 | if (pfLock->fl_flags & |
1da177e4 | 685 | (~(FL_POSIX | FL_FLOCK | FL_SLEEP | FL_ACCESS | FL_LEASE))) |
b6b38f70 | 686 | cFYI(1, "Unknown lock flags 0x%x", pfLock->fl_flags); |
1da177e4 LT |
687 | |
688 | if (pfLock->fl_type == F_WRLCK) { | |
b6b38f70 | 689 | cFYI(1, "F_WRLCK "); |
1da177e4 LT |
690 | numLock = 1; |
691 | } else if (pfLock->fl_type == F_UNLCK) { | |
b6b38f70 | 692 | cFYI(1, "F_UNLCK"); |
1da177e4 | 693 | numUnlock = 1; |
d47d7c1a SF |
694 | /* Check if unlock includes more than |
695 | one lock range */ | |
1da177e4 | 696 | } else if (pfLock->fl_type == F_RDLCK) { |
b6b38f70 | 697 | cFYI(1, "F_RDLCK"); |
1da177e4 LT |
698 | lockType |= LOCKING_ANDX_SHARED_LOCK; |
699 | numLock = 1; | |
700 | } else if (pfLock->fl_type == F_EXLCK) { | |
b6b38f70 | 701 | cFYI(1, "F_EXLCK"); |
1da177e4 LT |
702 | numLock = 1; |
703 | } else if (pfLock->fl_type == F_SHLCK) { | |
b6b38f70 | 704 | cFYI(1, "F_SHLCK"); |
1da177e4 LT |
705 | lockType |= LOCKING_ANDX_SHARED_LOCK; |
706 | numLock = 1; | |
707 | } else | |
b6b38f70 | 708 | cFYI(1, "Unknown type of lock"); |
1da177e4 | 709 | |
e6a00296 | 710 | cifs_sb = CIFS_SB(file->f_path.dentry->d_sb); |
13cfb733 | 711 | tcon = tlink_tcon(((struct cifsFileInfo *)file->private_data)->tlink); |
08547b03 SF |
712 | netfid = ((struct cifsFileInfo *)file->private_data)->netfid; |
713 | ||
13a6e42a SF |
714 | if ((tcon->ses->capabilities & CAP_UNIX) && |
715 | (CIFS_UNIX_FCNTL_CAP & le64_to_cpu(tcon->fsUnixInfo.Capability)) && | |
acc18aa1 | 716 | ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NOPOSIXBRL) == 0)) |
13a6e42a | 717 | posix_locking = 1; |
08547b03 SF |
718 | /* BB add code here to normalize offset and length to |
719 | account for negative length which we can not accept over the | |
720 | wire */ | |
1da177e4 | 721 | if (IS_GETLK(cmd)) { |
fb8c4b14 | 722 | if (posix_locking) { |
08547b03 | 723 | int posix_lock_type; |
fb8c4b14 | 724 | if (lockType & LOCKING_ANDX_SHARED_LOCK) |
08547b03 SF |
725 | posix_lock_type = CIFS_RDLCK; |
726 | else | |
727 | posix_lock_type = CIFS_WRLCK; | |
13a6e42a | 728 | rc = CIFSSMBPosixLock(xid, tcon, netfid, 1 /* get */, |
fc94cdb9 | 729 | length, pfLock, |
08547b03 SF |
730 | posix_lock_type, wait_flag); |
731 | FreeXid(xid); | |
732 | return rc; | |
733 | } | |
734 | ||
735 | /* BB we could chain these into one lock request BB */ | |
13a6e42a | 736 | rc = CIFSSMBLock(xid, tcon, netfid, length, pfLock->fl_start, |
12fed00d | 737 | 0, 1, lockType, 0 /* wait flag */, 0); |
1da177e4 | 738 | if (rc == 0) { |
13a6e42a | 739 | rc = CIFSSMBLock(xid, tcon, netfid, length, |
1da177e4 LT |
740 | pfLock->fl_start, 1 /* numUnlock */ , |
741 | 0 /* numLock */ , lockType, | |
12fed00d | 742 | 0 /* wait flag */, 0); |
1da177e4 LT |
743 | pfLock->fl_type = F_UNLCK; |
744 | if (rc != 0) | |
b6b38f70 JP |
745 | cERROR(1, "Error unlocking previously locked " |
746 | "range %d during test of lock", rc); | |
1da177e4 LT |
747 | rc = 0; |
748 | ||
749 | } else { | |
750 | /* if rc == ERR_SHARING_VIOLATION ? */ | |
f05337c6 PS |
751 | rc = 0; |
752 | ||
753 | if (lockType & LOCKING_ANDX_SHARED_LOCK) { | |
754 | pfLock->fl_type = F_WRLCK; | |
755 | } else { | |
756 | rc = CIFSSMBLock(xid, tcon, netfid, length, | |
757 | pfLock->fl_start, 0, 1, | |
758 | lockType | LOCKING_ANDX_SHARED_LOCK, | |
12fed00d | 759 | 0 /* wait flag */, 0); |
f05337c6 PS |
760 | if (rc == 0) { |
761 | rc = CIFSSMBLock(xid, tcon, netfid, | |
762 | length, pfLock->fl_start, 1, 0, | |
763 | lockType | | |
764 | LOCKING_ANDX_SHARED_LOCK, | |
12fed00d | 765 | 0 /* wait flag */, 0); |
f05337c6 PS |
766 | pfLock->fl_type = F_RDLCK; |
767 | if (rc != 0) | |
f19159dc | 768 | cERROR(1, "Error unlocking " |
f05337c6 | 769 | "previously locked range %d " |
f19159dc | 770 | "during test of lock", rc); |
f05337c6 PS |
771 | rc = 0; |
772 | } else { | |
773 | pfLock->fl_type = F_WRLCK; | |
774 | rc = 0; | |
775 | } | |
776 | } | |
1da177e4 LT |
777 | } |
778 | ||
779 | FreeXid(xid); | |
780 | return rc; | |
781 | } | |
7ee1af76 JA |
782 | |
783 | if (!numLock && !numUnlock) { | |
784 | /* if no lock or unlock then nothing | |
785 | to do since we do not know what it is */ | |
786 | FreeXid(xid); | |
787 | return -EOPNOTSUPP; | |
788 | } | |
789 | ||
790 | if (posix_locking) { | |
08547b03 | 791 | int posix_lock_type; |
fb8c4b14 | 792 | if (lockType & LOCKING_ANDX_SHARED_LOCK) |
08547b03 SF |
793 | posix_lock_type = CIFS_RDLCK; |
794 | else | |
795 | posix_lock_type = CIFS_WRLCK; | |
50c2f753 | 796 | |
fb8c4b14 | 797 | if (numUnlock == 1) |
beb84dc8 | 798 | posix_lock_type = CIFS_UNLCK; |
7ee1af76 | 799 | |
13a6e42a | 800 | rc = CIFSSMBPosixLock(xid, tcon, netfid, 0 /* set */, |
fc94cdb9 | 801 | length, pfLock, |
08547b03 | 802 | posix_lock_type, wait_flag); |
7ee1af76 | 803 | } else { |
c21dfb69 | 804 | struct cifsFileInfo *fid = file->private_data; |
7ee1af76 JA |
805 | |
806 | if (numLock) { | |
13a6e42a | 807 | rc = CIFSSMBLock(xid, tcon, netfid, length, |
12fed00d PS |
808 | pfLock->fl_start, 0, numLock, lockType, |
809 | wait_flag, 0); | |
7ee1af76 JA |
810 | |
811 | if (rc == 0) { | |
812 | /* For Windows locks we must store them. */ | |
813 | rc = store_file_lock(fid, length, | |
814 | pfLock->fl_start, lockType); | |
815 | } | |
816 | } else if (numUnlock) { | |
817 | /* For each stored lock that this unlock overlaps | |
818 | completely, unlock it. */ | |
819 | int stored_rc = 0; | |
820 | struct cifsLockInfo *li, *tmp; | |
821 | ||
6b70c955 | 822 | rc = 0; |
796e5661 | 823 | mutex_lock(&fid->lock_mutex); |
7ee1af76 JA |
824 | list_for_each_entry_safe(li, tmp, &fid->llist, llist) { |
825 | if (pfLock->fl_start <= li->offset && | |
c19eb710 | 826 | (pfLock->fl_start + length) >= |
39db810c | 827 | (li->offset + li->length)) { |
13a6e42a | 828 | stored_rc = CIFSSMBLock(xid, tcon, |
12fed00d PS |
829 | netfid, li->length, |
830 | li->offset, 1, 0, | |
831 | li->type, false, 0); | |
7ee1af76 JA |
832 | if (stored_rc) |
833 | rc = stored_rc; | |
2c964d1f PS |
834 | else { |
835 | list_del(&li->llist); | |
836 | kfree(li); | |
837 | } | |
7ee1af76 JA |
838 | } |
839 | } | |
796e5661 | 840 | mutex_unlock(&fid->lock_mutex); |
7ee1af76 JA |
841 | } |
842 | } | |
843 | ||
d634cc15 | 844 | if (pfLock->fl_flags & FL_POSIX) |
1da177e4 LT |
845 | posix_lock_file_wait(file, pfLock); |
846 | FreeXid(xid); | |
847 | return rc; | |
848 | } | |
849 | ||
fbec9ab9 JL |
850 | /* update the file size (if needed) after a write */ |
851 | static void | |
852 | cifs_update_eof(struct cifsInodeInfo *cifsi, loff_t offset, | |
853 | unsigned int bytes_written) | |
854 | { | |
855 | loff_t end_of_write = offset + bytes_written; | |
856 | ||
857 | if (end_of_write > cifsi->server_eof) | |
858 | cifsi->server_eof = end_of_write; | |
859 | } | |
860 | ||
1da177e4 LT |
861 | ssize_t cifs_user_write(struct file *file, const char __user *write_data, |
862 | size_t write_size, loff_t *poffset) | |
863 | { | |
50ae28f0 | 864 | struct inode *inode = file->f_path.dentry->d_inode; |
1da177e4 LT |
865 | int rc = 0; |
866 | unsigned int bytes_written = 0; | |
867 | unsigned int total_written; | |
868 | struct cifs_sb_info *cifs_sb; | |
869 | struct cifsTconInfo *pTcon; | |
7749981e | 870 | int xid; |
1da177e4 | 871 | struct cifsFileInfo *open_file; |
50ae28f0 | 872 | struct cifsInodeInfo *cifsi = CIFS_I(inode); |
1da177e4 | 873 | |
e6a00296 | 874 | cifs_sb = CIFS_SB(file->f_path.dentry->d_sb); |
1da177e4 | 875 | |
b6b38f70 JP |
876 | /* cFYI(1, " write %d bytes to offset %lld of %s", write_size, |
877 | *poffset, file->f_path.dentry->d_name.name); */ | |
1da177e4 LT |
878 | |
879 | if (file->private_data == NULL) | |
880 | return -EBADF; | |
ba00ba64 | 881 | |
c21dfb69 | 882 | open_file = file->private_data; |
13cfb733 | 883 | pTcon = tlink_tcon(open_file->tlink); |
50c2f753 | 884 | |
838726c4 JL |
885 | rc = generic_write_checks(file, poffset, &write_size, 0); |
886 | if (rc) | |
887 | return rc; | |
888 | ||
1da177e4 | 889 | xid = GetXid(); |
1da177e4 | 890 | |
1da177e4 LT |
891 | for (total_written = 0; write_size > total_written; |
892 | total_written += bytes_written) { | |
893 | rc = -EAGAIN; | |
894 | while (rc == -EAGAIN) { | |
895 | if (file->private_data == NULL) { | |
896 | /* file has been closed on us */ | |
897 | FreeXid(xid); | |
898 | /* if we have gotten here we have written some data | |
899 | and blocked, and the file has been freed on us while | |
900 | we blocked so return what we managed to write */ | |
901 | return total_written; | |
fb8c4b14 | 902 | } |
1da177e4 | 903 | if (open_file->invalidHandle) { |
1da177e4 LT |
904 | /* we could deadlock if we called |
905 | filemap_fdatawait from here so tell | |
906 | reopen_file not to flush data to server | |
907 | now */ | |
15886177 | 908 | rc = cifs_reopen_file(open_file, false); |
1da177e4 LT |
909 | if (rc != 0) |
910 | break; | |
911 | } | |
912 | ||
913 | rc = CIFSSMBWrite(xid, pTcon, | |
914 | open_file->netfid, | |
915 | min_t(const int, cifs_sb->wsize, | |
916 | write_size - total_written), | |
917 | *poffset, &bytes_written, | |
7749981e | 918 | NULL, write_data + total_written, 0); |
1da177e4 LT |
919 | } |
920 | if (rc || (bytes_written == 0)) { | |
921 | if (total_written) | |
922 | break; | |
923 | else { | |
924 | FreeXid(xid); | |
925 | return rc; | |
926 | } | |
fbec9ab9 JL |
927 | } else { |
928 | cifs_update_eof(cifsi, *poffset, bytes_written); | |
1da177e4 | 929 | *poffset += bytes_written; |
fbec9ab9 | 930 | } |
1da177e4 LT |
931 | } |
932 | ||
a4544347 | 933 | cifs_stats_bytes_written(pTcon, total_written); |
1da177e4 | 934 | |
fb8c4b14 | 935 | /* Do not update local mtime - server will set its actual value on write |
50ae28f0 JS |
936 | * inode->i_ctime = inode->i_mtime = |
937 | * current_fs_time(inode->i_sb);*/ | |
938 | if (total_written > 0) { | |
939 | spin_lock(&inode->i_lock); | |
940 | if (*poffset > inode->i_size) | |
941 | i_size_write(inode, *poffset); | |
942 | spin_unlock(&inode->i_lock); | |
1da177e4 | 943 | } |
50ae28f0 JS |
944 | mark_inode_dirty_sync(inode); |
945 | ||
1da177e4 LT |
946 | FreeXid(xid); |
947 | return total_written; | |
948 | } | |
949 | ||
7da4b49a JL |
950 | static ssize_t cifs_write(struct cifsFileInfo *open_file, |
951 | const char *write_data, size_t write_size, | |
952 | loff_t *poffset) | |
1da177e4 LT |
953 | { |
954 | int rc = 0; | |
955 | unsigned int bytes_written = 0; | |
956 | unsigned int total_written; | |
957 | struct cifs_sb_info *cifs_sb; | |
958 | struct cifsTconInfo *pTcon; | |
7749981e | 959 | int xid; |
7da4b49a JL |
960 | struct dentry *dentry = open_file->dentry; |
961 | struct cifsInodeInfo *cifsi = CIFS_I(dentry->d_inode); | |
1da177e4 | 962 | |
7da4b49a | 963 | cifs_sb = CIFS_SB(dentry->d_sb); |
1da177e4 | 964 | |
b6b38f70 | 965 | cFYI(1, "write %zd bytes to offset %lld of %s", write_size, |
7da4b49a | 966 | *poffset, dentry->d_name.name); |
1da177e4 | 967 | |
13cfb733 | 968 | pTcon = tlink_tcon(open_file->tlink); |
50c2f753 | 969 | |
1da177e4 | 970 | xid = GetXid(); |
1da177e4 | 971 | |
1da177e4 LT |
972 | for (total_written = 0; write_size > total_written; |
973 | total_written += bytes_written) { | |
974 | rc = -EAGAIN; | |
975 | while (rc == -EAGAIN) { | |
1da177e4 | 976 | if (open_file->invalidHandle) { |
1da177e4 LT |
977 | /* we could deadlock if we called |
978 | filemap_fdatawait from here so tell | |
fb8c4b14 | 979 | reopen_file not to flush data to |
1da177e4 | 980 | server now */ |
15886177 | 981 | rc = cifs_reopen_file(open_file, false); |
1da177e4 LT |
982 | if (rc != 0) |
983 | break; | |
984 | } | |
fb8c4b14 SF |
985 | if (experimEnabled || (pTcon->ses->server && |
986 | ((pTcon->ses->server->secMode & | |
08775834 | 987 | (SECMODE_SIGN_REQUIRED | SECMODE_SIGN_ENABLED)) |
c01f36a8 | 988 | == 0))) { |
3e84469d SF |
989 | struct kvec iov[2]; |
990 | unsigned int len; | |
991 | ||
0ae0efad | 992 | len = min((size_t)cifs_sb->wsize, |
3e84469d SF |
993 | write_size - total_written); |
994 | /* iov[0] is reserved for smb header */ | |
995 | iov[1].iov_base = (char *)write_data + | |
996 | total_written; | |
997 | iov[1].iov_len = len; | |
d6e04ae6 | 998 | rc = CIFSSMBWrite2(xid, pTcon, |
3e84469d | 999 | open_file->netfid, len, |
d6e04ae6 | 1000 | *poffset, &bytes_written, |
7749981e | 1001 | iov, 1, 0); |
d6e04ae6 | 1002 | } else |
60808233 SF |
1003 | rc = CIFSSMBWrite(xid, pTcon, |
1004 | open_file->netfid, | |
1005 | min_t(const int, cifs_sb->wsize, | |
1006 | write_size - total_written), | |
1007 | *poffset, &bytes_written, | |
1008 | write_data + total_written, | |
7749981e | 1009 | NULL, 0); |
1da177e4 LT |
1010 | } |
1011 | if (rc || (bytes_written == 0)) { | |
1012 | if (total_written) | |
1013 | break; | |
1014 | else { | |
1015 | FreeXid(xid); | |
1016 | return rc; | |
1017 | } | |
fbec9ab9 JL |
1018 | } else { |
1019 | cifs_update_eof(cifsi, *poffset, bytes_written); | |
1da177e4 | 1020 | *poffset += bytes_written; |
fbec9ab9 | 1021 | } |
1da177e4 LT |
1022 | } |
1023 | ||
a4544347 | 1024 | cifs_stats_bytes_written(pTcon, total_written); |
1da177e4 | 1025 | |
7da4b49a JL |
1026 | if (total_written > 0) { |
1027 | spin_lock(&dentry->d_inode->i_lock); | |
1028 | if (*poffset > dentry->d_inode->i_size) | |
1029 | i_size_write(dentry->d_inode, *poffset); | |
1030 | spin_unlock(&dentry->d_inode->i_lock); | |
1da177e4 | 1031 | } |
7da4b49a | 1032 | mark_inode_dirty_sync(dentry->d_inode); |
1da177e4 LT |
1033 | FreeXid(xid); |
1034 | return total_written; | |
1035 | } | |
1036 | ||
6508d904 JL |
1037 | struct cifsFileInfo *find_readable_file(struct cifsInodeInfo *cifs_inode, |
1038 | bool fsuid_only) | |
630f3f0c SF |
1039 | { |
1040 | struct cifsFileInfo *open_file = NULL; | |
6508d904 JL |
1041 | struct cifs_sb_info *cifs_sb = CIFS_SB(cifs_inode->vfs_inode.i_sb); |
1042 | ||
1043 | /* only filter by fsuid on multiuser mounts */ | |
1044 | if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MULTIUSER)) | |
1045 | fsuid_only = false; | |
630f3f0c | 1046 | |
4477288a | 1047 | spin_lock(&cifs_file_list_lock); |
630f3f0c SF |
1048 | /* we could simply get the first_list_entry since write-only entries |
1049 | are always at the end of the list but since the first entry might | |
1050 | have a close pending, we go through the whole list */ | |
1051 | list_for_each_entry(open_file, &cifs_inode->openFileList, flist) { | |
6508d904 JL |
1052 | if (fsuid_only && open_file->uid != current_fsuid()) |
1053 | continue; | |
2e396b83 | 1054 | if (OPEN_FMODE(open_file->f_flags) & FMODE_READ) { |
630f3f0c SF |
1055 | if (!open_file->invalidHandle) { |
1056 | /* found a good file */ | |
1057 | /* lock it so it will not be closed on us */ | |
6ab409b5 | 1058 | cifsFileInfo_get(open_file); |
4477288a | 1059 | spin_unlock(&cifs_file_list_lock); |
630f3f0c SF |
1060 | return open_file; |
1061 | } /* else might as well continue, and look for | |
1062 | another, or simply have the caller reopen it | |
1063 | again rather than trying to fix this handle */ | |
1064 | } else /* write only file */ | |
1065 | break; /* write only files are last so must be done */ | |
1066 | } | |
4477288a | 1067 | spin_unlock(&cifs_file_list_lock); |
630f3f0c SF |
1068 | return NULL; |
1069 | } | |
630f3f0c | 1070 | |
6508d904 JL |
1071 | struct cifsFileInfo *find_writable_file(struct cifsInodeInfo *cifs_inode, |
1072 | bool fsuid_only) | |
6148a742 SF |
1073 | { |
1074 | struct cifsFileInfo *open_file; | |
d3892294 | 1075 | struct cifs_sb_info *cifs_sb; |
2846d386 | 1076 | bool any_available = false; |
dd99cd80 | 1077 | int rc; |
6148a742 | 1078 | |
60808233 SF |
1079 | /* Having a null inode here (because mapping->host was set to zero by |
1080 | the VFS or MM) should not happen but we had reports of on oops (due to | |
1081 | it being zero) during stress testcases so we need to check for it */ | |
1082 | ||
fb8c4b14 | 1083 | if (cifs_inode == NULL) { |
b6b38f70 | 1084 | cERROR(1, "Null inode passed to cifs_writeable_file"); |
60808233 SF |
1085 | dump_stack(); |
1086 | return NULL; | |
1087 | } | |
1088 | ||
d3892294 JL |
1089 | cifs_sb = CIFS_SB(cifs_inode->vfs_inode.i_sb); |
1090 | ||
6508d904 JL |
1091 | /* only filter by fsuid on multiuser mounts */ |
1092 | if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MULTIUSER)) | |
1093 | fsuid_only = false; | |
1094 | ||
4477288a | 1095 | spin_lock(&cifs_file_list_lock); |
9b22b0b7 | 1096 | refind_writable: |
6148a742 | 1097 | list_for_each_entry(open_file, &cifs_inode->openFileList, flist) { |
6508d904 JL |
1098 | if (!any_available && open_file->pid != current->tgid) |
1099 | continue; | |
1100 | if (fsuid_only && open_file->uid != current_fsuid()) | |
6148a742 | 1101 | continue; |
2e396b83 | 1102 | if (OPEN_FMODE(open_file->f_flags) & FMODE_WRITE) { |
6ab409b5 | 1103 | cifsFileInfo_get(open_file); |
9b22b0b7 SF |
1104 | |
1105 | if (!open_file->invalidHandle) { | |
1106 | /* found a good writable file */ | |
4477288a | 1107 | spin_unlock(&cifs_file_list_lock); |
9b22b0b7 SF |
1108 | return open_file; |
1109 | } | |
8840dee9 | 1110 | |
4477288a | 1111 | spin_unlock(&cifs_file_list_lock); |
cdff08e7 | 1112 | |
9b22b0b7 | 1113 | /* Had to unlock since following call can block */ |
15886177 | 1114 | rc = cifs_reopen_file(open_file, false); |
cdff08e7 SF |
1115 | if (!rc) |
1116 | return open_file; | |
9b22b0b7 | 1117 | |
cdff08e7 | 1118 | /* if it fails, try another handle if possible */ |
b6b38f70 | 1119 | cFYI(1, "wp failed on reopen file"); |
6ab409b5 | 1120 | cifsFileInfo_put(open_file); |
8840dee9 | 1121 | |
cdff08e7 SF |
1122 | spin_lock(&cifs_file_list_lock); |
1123 | ||
9b22b0b7 SF |
1124 | /* else we simply continue to the next entry. Thus |
1125 | we do not loop on reopen errors. If we | |
1126 | can not reopen the file, for example if we | |
1127 | reconnected to a server with another client | |
1128 | racing to delete or lock the file we would not | |
1129 | make progress if we restarted before the beginning | |
1130 | of the loop here. */ | |
6148a742 SF |
1131 | } |
1132 | } | |
2846d386 JL |
1133 | /* couldn't find useable FH with same pid, try any available */ |
1134 | if (!any_available) { | |
1135 | any_available = true; | |
1136 | goto refind_writable; | |
1137 | } | |
4477288a | 1138 | spin_unlock(&cifs_file_list_lock); |
6148a742 SF |
1139 | return NULL; |
1140 | } | |
1141 | ||
1da177e4 LT |
1142 | static int cifs_partialpagewrite(struct page *page, unsigned from, unsigned to) |
1143 | { | |
1144 | struct address_space *mapping = page->mapping; | |
1145 | loff_t offset = (loff_t)page->index << PAGE_CACHE_SHIFT; | |
1146 | char *write_data; | |
1147 | int rc = -EFAULT; | |
1148 | int bytes_written = 0; | |
1149 | struct cifs_sb_info *cifs_sb; | |
1da177e4 | 1150 | struct inode *inode; |
6148a742 | 1151 | struct cifsFileInfo *open_file; |
1da177e4 LT |
1152 | |
1153 | if (!mapping || !mapping->host) | |
1154 | return -EFAULT; | |
1155 | ||
1156 | inode = page->mapping->host; | |
1157 | cifs_sb = CIFS_SB(inode->i_sb); | |
1da177e4 LT |
1158 | |
1159 | offset += (loff_t)from; | |
1160 | write_data = kmap(page); | |
1161 | write_data += from; | |
1162 | ||
1163 | if ((to > PAGE_CACHE_SIZE) || (from > to)) { | |
1164 | kunmap(page); | |
1165 | return -EIO; | |
1166 | } | |
1167 | ||
1168 | /* racing with truncate? */ | |
1169 | if (offset > mapping->host->i_size) { | |
1170 | kunmap(page); | |
1171 | return 0; /* don't care */ | |
1172 | } | |
1173 | ||
1174 | /* check to make sure that we are not extending the file */ | |
1175 | if (mapping->host->i_size - offset < (loff_t)to) | |
fb8c4b14 | 1176 | to = (unsigned)(mapping->host->i_size - offset); |
1da177e4 | 1177 | |
6508d904 | 1178 | open_file = find_writable_file(CIFS_I(mapping->host), false); |
6148a742 | 1179 | if (open_file) { |
7da4b49a JL |
1180 | bytes_written = cifs_write(open_file, write_data, |
1181 | to - from, &offset); | |
6ab409b5 | 1182 | cifsFileInfo_put(open_file); |
1da177e4 | 1183 | /* Does mm or vfs already set times? */ |
6148a742 | 1184 | inode->i_atime = inode->i_mtime = current_fs_time(inode->i_sb); |
bb5a9a04 | 1185 | if ((bytes_written > 0) && (offset)) |
6148a742 | 1186 | rc = 0; |
bb5a9a04 SF |
1187 | else if (bytes_written < 0) |
1188 | rc = bytes_written; | |
6148a742 | 1189 | } else { |
b6b38f70 | 1190 | cFYI(1, "No writeable filehandles for inode"); |
1da177e4 LT |
1191 | rc = -EIO; |
1192 | } | |
1193 | ||
1194 | kunmap(page); | |
1195 | return rc; | |
1196 | } | |
1197 | ||
1da177e4 | 1198 | static int cifs_writepages(struct address_space *mapping, |
37c0eb46 | 1199 | struct writeback_control *wbc) |
1da177e4 | 1200 | { |
37c0eb46 SF |
1201 | unsigned int bytes_to_write; |
1202 | unsigned int bytes_written; | |
1203 | struct cifs_sb_info *cifs_sb; | |
1204 | int done = 0; | |
111ebb6e | 1205 | pgoff_t end; |
37c0eb46 | 1206 | pgoff_t index; |
fb8c4b14 SF |
1207 | int range_whole = 0; |
1208 | struct kvec *iov; | |
84d2f07e | 1209 | int len; |
37c0eb46 SF |
1210 | int n_iov = 0; |
1211 | pgoff_t next; | |
1212 | int nr_pages; | |
1213 | __u64 offset = 0; | |
23e7dd7d | 1214 | struct cifsFileInfo *open_file; |
ba00ba64 | 1215 | struct cifsTconInfo *tcon; |
fbec9ab9 | 1216 | struct cifsInodeInfo *cifsi = CIFS_I(mapping->host); |
37c0eb46 SF |
1217 | struct page *page; |
1218 | struct pagevec pvec; | |
1219 | int rc = 0; | |
1220 | int scanned = 0; | |
7749981e | 1221 | int xid; |
1da177e4 | 1222 | |
37c0eb46 | 1223 | cifs_sb = CIFS_SB(mapping->host->i_sb); |
50c2f753 | 1224 | |
37c0eb46 SF |
1225 | /* |
1226 | * If wsize is smaller that the page cache size, default to writing | |
1227 | * one page at a time via cifs_writepage | |
1228 | */ | |
1229 | if (cifs_sb->wsize < PAGE_CACHE_SIZE) | |
1230 | return generic_writepages(mapping, wbc); | |
1231 | ||
9a0c8230 | 1232 | iov = kmalloc(32 * sizeof(struct kvec), GFP_KERNEL); |
fb8c4b14 | 1233 | if (iov == NULL) |
9a0c8230 SF |
1234 | return generic_writepages(mapping, wbc); |
1235 | ||
37c0eb46 | 1236 | /* |
f3983c21 JL |
1237 | * if there's no open file, then this is likely to fail too, |
1238 | * but it'll at least handle the return. Maybe it should be | |
1239 | * a BUG() instead? | |
37c0eb46 | 1240 | */ |
6508d904 | 1241 | open_file = find_writable_file(CIFS_I(mapping->host), false); |
f3983c21 | 1242 | if (!open_file) { |
9a0c8230 | 1243 | kfree(iov); |
f3983c21 JL |
1244 | return generic_writepages(mapping, wbc); |
1245 | } | |
1246 | ||
13cfb733 | 1247 | tcon = tlink_tcon(open_file->tlink); |
f3983c21 JL |
1248 | if (!experimEnabled && tcon->ses->server->secMode & |
1249 | (SECMODE_SIGN_REQUIRED | SECMODE_SIGN_ENABLED)) { | |
1250 | cifsFileInfo_put(open_file); | |
6b035904 | 1251 | kfree(iov); |
f3983c21 | 1252 | return generic_writepages(mapping, wbc); |
37c0eb46 | 1253 | } |
f3983c21 | 1254 | cifsFileInfo_put(open_file); |
37c0eb46 | 1255 | |
1da177e4 LT |
1256 | xid = GetXid(); |
1257 | ||
37c0eb46 | 1258 | pagevec_init(&pvec, 0); |
111ebb6e | 1259 | if (wbc->range_cyclic) { |
37c0eb46 | 1260 | index = mapping->writeback_index; /* Start from prev offset */ |
111ebb6e OH |
1261 | end = -1; |
1262 | } else { | |
1263 | index = wbc->range_start >> PAGE_CACHE_SHIFT; | |
1264 | end = wbc->range_end >> PAGE_CACHE_SHIFT; | |
1265 | if (wbc->range_start == 0 && wbc->range_end == LLONG_MAX) | |
1266 | range_whole = 1; | |
37c0eb46 SF |
1267 | scanned = 1; |
1268 | } | |
1269 | retry: | |
1270 | while (!done && (index <= end) && | |
1271 | (nr_pages = pagevec_lookup_tag(&pvec, mapping, &index, | |
1272 | PAGECACHE_TAG_DIRTY, | |
1273 | min(end - index, (pgoff_t)PAGEVEC_SIZE - 1) + 1))) { | |
1274 | int first; | |
1275 | unsigned int i; | |
1276 | ||
37c0eb46 SF |
1277 | first = -1; |
1278 | next = 0; | |
1279 | n_iov = 0; | |
1280 | bytes_to_write = 0; | |
1281 | ||
1282 | for (i = 0; i < nr_pages; i++) { | |
1283 | page = pvec.pages[i]; | |
1284 | /* | |
1285 | * At this point we hold neither mapping->tree_lock nor | |
1286 | * lock on the page itself: the page may be truncated or | |
1287 | * invalidated (changing page->mapping to NULL), or even | |
1288 | * swizzled back from swapper_space to tmpfs file | |
1289 | * mapping | |
1290 | */ | |
1291 | ||
1292 | if (first < 0) | |
1293 | lock_page(page); | |
529ae9aa | 1294 | else if (!trylock_page(page)) |
37c0eb46 SF |
1295 | break; |
1296 | ||
1297 | if (unlikely(page->mapping != mapping)) { | |
1298 | unlock_page(page); | |
1299 | break; | |
1300 | } | |
1301 | ||
111ebb6e | 1302 | if (!wbc->range_cyclic && page->index > end) { |
37c0eb46 SF |
1303 | done = 1; |
1304 | unlock_page(page); | |
1305 | break; | |
1306 | } | |
1307 | ||
1308 | if (next && (page->index != next)) { | |
1309 | /* Not next consecutive page */ | |
1310 | unlock_page(page); | |
1311 | break; | |
1312 | } | |
1313 | ||
1314 | if (wbc->sync_mode != WB_SYNC_NONE) | |
1315 | wait_on_page_writeback(page); | |
1316 | ||
1317 | if (PageWriteback(page) || | |
cb876f45 | 1318 | !clear_page_dirty_for_io(page)) { |
37c0eb46 SF |
1319 | unlock_page(page); |
1320 | break; | |
1321 | } | |
84d2f07e | 1322 | |
cb876f45 LT |
1323 | /* |
1324 | * This actually clears the dirty bit in the radix tree. | |
1325 | * See cifs_writepage() for more commentary. | |
1326 | */ | |
1327 | set_page_writeback(page); | |
1328 | ||
84d2f07e SF |
1329 | if (page_offset(page) >= mapping->host->i_size) { |
1330 | done = 1; | |
1331 | unlock_page(page); | |
cb876f45 | 1332 | end_page_writeback(page); |
84d2f07e SF |
1333 | break; |
1334 | } | |
1335 | ||
37c0eb46 SF |
1336 | /* |
1337 | * BB can we get rid of this? pages are held by pvec | |
1338 | */ | |
1339 | page_cache_get(page); | |
1340 | ||
84d2f07e SF |
1341 | len = min(mapping->host->i_size - page_offset(page), |
1342 | (loff_t)PAGE_CACHE_SIZE); | |
1343 | ||
37c0eb46 SF |
1344 | /* reserve iov[0] for the smb header */ |
1345 | n_iov++; | |
1346 | iov[n_iov].iov_base = kmap(page); | |
84d2f07e SF |
1347 | iov[n_iov].iov_len = len; |
1348 | bytes_to_write += len; | |
37c0eb46 SF |
1349 | |
1350 | if (first < 0) { | |
1351 | first = i; | |
1352 | offset = page_offset(page); | |
1353 | } | |
1354 | next = page->index + 1; | |
1355 | if (bytes_to_write + PAGE_CACHE_SIZE > cifs_sb->wsize) | |
1356 | break; | |
1357 | } | |
1358 | if (n_iov) { | |
941b853d | 1359 | retry_write: |
6508d904 JL |
1360 | open_file = find_writable_file(CIFS_I(mapping->host), |
1361 | false); | |
23e7dd7d | 1362 | if (!open_file) { |
b6b38f70 | 1363 | cERROR(1, "No writable handles for inode"); |
23e7dd7d | 1364 | rc = -EBADF; |
1047abc1 | 1365 | } else { |
f3983c21 | 1366 | rc = CIFSSMBWrite2(xid, tcon, open_file->netfid, |
23e7dd7d SF |
1367 | bytes_to_write, offset, |
1368 | &bytes_written, iov, n_iov, | |
7749981e | 1369 | 0); |
6ab409b5 | 1370 | cifsFileInfo_put(open_file); |
f3983c21 | 1371 | } |
fbec9ab9 | 1372 | |
941b853d JL |
1373 | cFYI(1, "Write2 rc=%d, wrote=%u", rc, bytes_written); |
1374 | ||
1375 | /* | |
1376 | * For now, treat a short write as if nothing got | |
1377 | * written. A zero length write however indicates | |
1378 | * ENOSPC or EFBIG. We have no way to know which | |
1379 | * though, so call it ENOSPC for now. EFBIG would | |
1380 | * get translated to AS_EIO anyway. | |
1381 | * | |
1382 | * FIXME: make it take into account the data that did | |
1383 | * get written | |
1384 | */ | |
1385 | if (rc == 0) { | |
1386 | if (bytes_written == 0) | |
1387 | rc = -ENOSPC; | |
1388 | else if (bytes_written < bytes_to_write) | |
1389 | rc = -EAGAIN; | |
1390 | } | |
1391 | ||
1392 | /* retry on data-integrity flush */ | |
1393 | if (wbc->sync_mode == WB_SYNC_ALL && rc == -EAGAIN) | |
1394 | goto retry_write; | |
1395 | ||
1396 | /* fix the stats and EOF */ | |
1397 | if (bytes_written > 0) { | |
f3983c21 | 1398 | cifs_stats_bytes_written(tcon, bytes_written); |
941b853d | 1399 | cifs_update_eof(cifsi, offset, bytes_written); |
37c0eb46 | 1400 | } |
f3983c21 | 1401 | |
37c0eb46 SF |
1402 | for (i = 0; i < n_iov; i++) { |
1403 | page = pvec.pages[first + i]; | |
941b853d JL |
1404 | /* on retryable write error, redirty page */ |
1405 | if (rc == -EAGAIN) | |
1406 | redirty_page_for_writepage(wbc, page); | |
1407 | else if (rc != 0) | |
eb9bdaa3 | 1408 | SetPageError(page); |
37c0eb46 SF |
1409 | kunmap(page); |
1410 | unlock_page(page); | |
cb876f45 | 1411 | end_page_writeback(page); |
37c0eb46 SF |
1412 | page_cache_release(page); |
1413 | } | |
941b853d JL |
1414 | |
1415 | if (rc != -EAGAIN) | |
1416 | mapping_set_error(mapping, rc); | |
1417 | else | |
1418 | rc = 0; | |
1419 | ||
37c0eb46 SF |
1420 | if ((wbc->nr_to_write -= n_iov) <= 0) |
1421 | done = 1; | |
1422 | index = next; | |
b066a48c DK |
1423 | } else |
1424 | /* Need to re-find the pages we skipped */ | |
1425 | index = pvec.pages[0]->index + 1; | |
1426 | ||
37c0eb46 SF |
1427 | pagevec_release(&pvec); |
1428 | } | |
1429 | if (!scanned && !done) { | |
1430 | /* | |
1431 | * We hit the last page and there is more work to be done: wrap | |
1432 | * back to the start of the file | |
1433 | */ | |
1434 | scanned = 1; | |
1435 | index = 0; | |
1436 | goto retry; | |
1437 | } | |
111ebb6e | 1438 | if (wbc->range_cyclic || (range_whole && wbc->nr_to_write > 0)) |
37c0eb46 SF |
1439 | mapping->writeback_index = index; |
1440 | ||
1da177e4 | 1441 | FreeXid(xid); |
9a0c8230 | 1442 | kfree(iov); |
1da177e4 LT |
1443 | return rc; |
1444 | } | |
1da177e4 | 1445 | |
fb8c4b14 | 1446 | static int cifs_writepage(struct page *page, struct writeback_control *wbc) |
1da177e4 LT |
1447 | { |
1448 | int rc = -EFAULT; | |
1449 | int xid; | |
1450 | ||
1451 | xid = GetXid(); | |
1452 | /* BB add check for wbc flags */ | |
1453 | page_cache_get(page); | |
ad7a2926 | 1454 | if (!PageUptodate(page)) |
b6b38f70 | 1455 | cFYI(1, "ppw - page not up to date"); |
cb876f45 LT |
1456 | |
1457 | /* | |
1458 | * Set the "writeback" flag, and clear "dirty" in the radix tree. | |
1459 | * | |
1460 | * A writepage() implementation always needs to do either this, | |
1461 | * or re-dirty the page with "redirty_page_for_writepage()" in | |
1462 | * the case of a failure. | |
1463 | * | |
1464 | * Just unlocking the page will cause the radix tree tag-bits | |
1465 | * to fail to update with the state of the page correctly. | |
1466 | */ | |
fb8c4b14 | 1467 | set_page_writeback(page); |
1da177e4 LT |
1468 | rc = cifs_partialpagewrite(page, 0, PAGE_CACHE_SIZE); |
1469 | SetPageUptodate(page); /* BB add check for error and Clearuptodate? */ | |
1470 | unlock_page(page); | |
cb876f45 LT |
1471 | end_page_writeback(page); |
1472 | page_cache_release(page); | |
1da177e4 LT |
1473 | FreeXid(xid); |
1474 | return rc; | |
1475 | } | |
1476 | ||
d9414774 NP |
1477 | static int cifs_write_end(struct file *file, struct address_space *mapping, |
1478 | loff_t pos, unsigned len, unsigned copied, | |
1479 | struct page *page, void *fsdata) | |
1da177e4 | 1480 | { |
d9414774 NP |
1481 | int rc; |
1482 | struct inode *inode = mapping->host; | |
1da177e4 | 1483 | |
b6b38f70 JP |
1484 | cFYI(1, "write_end for page %p from pos %lld with %d bytes", |
1485 | page, pos, copied); | |
d9414774 | 1486 | |
a98ee8c1 JL |
1487 | if (PageChecked(page)) { |
1488 | if (copied == len) | |
1489 | SetPageUptodate(page); | |
1490 | ClearPageChecked(page); | |
1491 | } else if (!PageUptodate(page) && copied == PAGE_CACHE_SIZE) | |
d9414774 | 1492 | SetPageUptodate(page); |
ad7a2926 | 1493 | |
1da177e4 | 1494 | if (!PageUptodate(page)) { |
d9414774 NP |
1495 | char *page_data; |
1496 | unsigned offset = pos & (PAGE_CACHE_SIZE - 1); | |
1497 | int xid; | |
1498 | ||
1499 | xid = GetXid(); | |
1da177e4 LT |
1500 | /* this is probably better than directly calling |
1501 | partialpage_write since in this function the file handle is | |
1502 | known which we might as well leverage */ | |
1503 | /* BB check if anything else missing out of ppw | |
1504 | such as updating last write time */ | |
1505 | page_data = kmap(page); | |
7da4b49a JL |
1506 | rc = cifs_write(file->private_data, page_data + offset, |
1507 | copied, &pos); | |
d9414774 | 1508 | /* if (rc < 0) should we set writebehind rc? */ |
1da177e4 | 1509 | kunmap(page); |
d9414774 NP |
1510 | |
1511 | FreeXid(xid); | |
fb8c4b14 | 1512 | } else { |
d9414774 NP |
1513 | rc = copied; |
1514 | pos += copied; | |
1da177e4 LT |
1515 | set_page_dirty(page); |
1516 | } | |
1517 | ||
d9414774 NP |
1518 | if (rc > 0) { |
1519 | spin_lock(&inode->i_lock); | |
1520 | if (pos > inode->i_size) | |
1521 | i_size_write(inode, pos); | |
1522 | spin_unlock(&inode->i_lock); | |
1523 | } | |
1524 | ||
1525 | unlock_page(page); | |
1526 | page_cache_release(page); | |
1527 | ||
1da177e4 LT |
1528 | return rc; |
1529 | } | |
1530 | ||
8be7e6ba | 1531 | int cifs_strict_fsync(struct file *file, int datasync) |
1da177e4 LT |
1532 | { |
1533 | int xid; | |
1534 | int rc = 0; | |
b298f223 | 1535 | struct cifsTconInfo *tcon; |
c21dfb69 | 1536 | struct cifsFileInfo *smbfile = file->private_data; |
e6a00296 | 1537 | struct inode *inode = file->f_path.dentry->d_inode; |
8be7e6ba | 1538 | struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb); |
1da177e4 LT |
1539 | |
1540 | xid = GetXid(); | |
1541 | ||
b6b38f70 | 1542 | cFYI(1, "Sync file - name: %s datasync: 0x%x", |
7ea80859 | 1543 | file->f_path.dentry->d_name.name, datasync); |
50c2f753 | 1544 | |
8be7e6ba PS |
1545 | if (!CIFS_I(inode)->clientCanCacheRead) |
1546 | cifs_invalidate_mapping(inode); | |
eb4b756b | 1547 | |
8be7e6ba PS |
1548 | tcon = tlink_tcon(smbfile->tlink); |
1549 | if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NOSSYNC)) | |
1550 | rc = CIFSSMBFlush(xid, tcon, smbfile->netfid); | |
1551 | ||
1552 | FreeXid(xid); | |
1553 | return rc; | |
1554 | } | |
1555 | ||
1556 | int cifs_fsync(struct file *file, int datasync) | |
1557 | { | |
1558 | int xid; | |
1559 | int rc = 0; | |
1560 | struct cifsTconInfo *tcon; | |
1561 | struct cifsFileInfo *smbfile = file->private_data; | |
1562 | struct cifs_sb_info *cifs_sb = CIFS_SB(file->f_path.dentry->d_sb); | |
1563 | ||
1564 | xid = GetXid(); | |
1565 | ||
1566 | cFYI(1, "Sync file - name: %s datasync: 0x%x", | |
1567 | file->f_path.dentry->d_name.name, datasync); | |
1568 | ||
1569 | tcon = tlink_tcon(smbfile->tlink); | |
1570 | if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NOSSYNC)) | |
1571 | rc = CIFSSMBFlush(xid, tcon, smbfile->netfid); | |
b298f223 | 1572 | |
1da177e4 LT |
1573 | FreeXid(xid); |
1574 | return rc; | |
1575 | } | |
1576 | ||
3978d717 | 1577 | /* static void cifs_sync_page(struct page *page) |
1da177e4 LT |
1578 | { |
1579 | struct address_space *mapping; | |
1580 | struct inode *inode; | |
1581 | unsigned long index = page->index; | |
1582 | unsigned int rpages = 0; | |
1583 | int rc = 0; | |
1584 | ||
f19159dc | 1585 | cFYI(1, "sync page %p", page); |
1da177e4 LT |
1586 | mapping = page->mapping; |
1587 | if (!mapping) | |
1588 | return 0; | |
1589 | inode = mapping->host; | |
1590 | if (!inode) | |
3978d717 | 1591 | return; */ |
1da177e4 | 1592 | |
fb8c4b14 | 1593 | /* fill in rpages then |
1da177e4 LT |
1594 | result = cifs_pagein_inode(inode, index, rpages); */ /* BB finish */ |
1595 | ||
b6b38f70 | 1596 | /* cFYI(1, "rpages is %d for sync page of Index %ld", rpages, index); |
1da177e4 | 1597 | |
3978d717 | 1598 | #if 0 |
1da177e4 LT |
1599 | if (rc < 0) |
1600 | return rc; | |
1601 | return 0; | |
3978d717 | 1602 | #endif |
1da177e4 LT |
1603 | } */ |
1604 | ||
1605 | /* | |
1606 | * As file closes, flush all cached write data for this inode checking | |
1607 | * for write behind errors. | |
1608 | */ | |
75e1fcc0 | 1609 | int cifs_flush(struct file *file, fl_owner_t id) |
1da177e4 | 1610 | { |
fb8c4b14 | 1611 | struct inode *inode = file->f_path.dentry->d_inode; |
1da177e4 LT |
1612 | int rc = 0; |
1613 | ||
eb4b756b | 1614 | if (file->f_mode & FMODE_WRITE) |
d3f1322a | 1615 | rc = filemap_write_and_wait(inode->i_mapping); |
50c2f753 | 1616 | |
b6b38f70 | 1617 | cFYI(1, "Flush inode %p file %p rc %d", inode, file, rc); |
1da177e4 LT |
1618 | |
1619 | return rc; | |
1620 | } | |
1621 | ||
1622 | ssize_t cifs_user_read(struct file *file, char __user *read_data, | |
1623 | size_t read_size, loff_t *poffset) | |
1624 | { | |
1625 | int rc = -EACCES; | |
1626 | unsigned int bytes_read = 0; | |
1627 | unsigned int total_read = 0; | |
1628 | unsigned int current_read_size; | |
1629 | struct cifs_sb_info *cifs_sb; | |
1630 | struct cifsTconInfo *pTcon; | |
1631 | int xid; | |
1632 | struct cifsFileInfo *open_file; | |
1633 | char *smb_read_data; | |
1634 | char __user *current_offset; | |
1635 | struct smb_com_read_rsp *pSMBr; | |
1636 | ||
1637 | xid = GetXid(); | |
e6a00296 | 1638 | cifs_sb = CIFS_SB(file->f_path.dentry->d_sb); |
1da177e4 LT |
1639 | |
1640 | if (file->private_data == NULL) { | |
0f3bc09e | 1641 | rc = -EBADF; |
1da177e4 | 1642 | FreeXid(xid); |
0f3bc09e | 1643 | return rc; |
1da177e4 | 1644 | } |
c21dfb69 | 1645 | open_file = file->private_data; |
13cfb733 | 1646 | pTcon = tlink_tcon(open_file->tlink); |
1da177e4 | 1647 | |
ad7a2926 | 1648 | if ((file->f_flags & O_ACCMODE) == O_WRONLY) |
b6b38f70 | 1649 | cFYI(1, "attempting read on write only file instance"); |
ad7a2926 | 1650 | |
1da177e4 LT |
1651 | for (total_read = 0, current_offset = read_data; |
1652 | read_size > total_read; | |
1653 | total_read += bytes_read, current_offset += bytes_read) { | |
fb8c4b14 | 1654 | current_read_size = min_t(const int, read_size - total_read, |
1da177e4 LT |
1655 | cifs_sb->rsize); |
1656 | rc = -EAGAIN; | |
1657 | smb_read_data = NULL; | |
1658 | while (rc == -EAGAIN) { | |
ec637e3f | 1659 | int buf_type = CIFS_NO_BUFFER; |
cdff08e7 | 1660 | if (open_file->invalidHandle) { |
15886177 | 1661 | rc = cifs_reopen_file(open_file, true); |
1da177e4 LT |
1662 | if (rc != 0) |
1663 | break; | |
1664 | } | |
bfa0d75a | 1665 | rc = CIFSSMBRead(xid, pTcon, |
ec637e3f SF |
1666 | open_file->netfid, |
1667 | current_read_size, *poffset, | |
1668 | &bytes_read, &smb_read_data, | |
1669 | &buf_type); | |
1da177e4 | 1670 | pSMBr = (struct smb_com_read_rsp *)smb_read_data; |
1da177e4 | 1671 | if (smb_read_data) { |
93544cc6 SF |
1672 | if (copy_to_user(current_offset, |
1673 | smb_read_data + | |
1674 | 4 /* RFC1001 length field */ + | |
1675 | le16_to_cpu(pSMBr->DataOffset), | |
ad7a2926 | 1676 | bytes_read)) |
93544cc6 | 1677 | rc = -EFAULT; |
93544cc6 | 1678 | |
fb8c4b14 | 1679 | if (buf_type == CIFS_SMALL_BUFFER) |
ec637e3f | 1680 | cifs_small_buf_release(smb_read_data); |
fb8c4b14 | 1681 | else if (buf_type == CIFS_LARGE_BUFFER) |
ec637e3f | 1682 | cifs_buf_release(smb_read_data); |
1da177e4 LT |
1683 | smb_read_data = NULL; |
1684 | } | |
1685 | } | |
1686 | if (rc || (bytes_read == 0)) { | |
1687 | if (total_read) { | |
1688 | break; | |
1689 | } else { | |
1690 | FreeXid(xid); | |
1691 | return rc; | |
1692 | } | |
1693 | } else { | |
a4544347 | 1694 | cifs_stats_bytes_read(pTcon, bytes_read); |
1da177e4 LT |
1695 | *poffset += bytes_read; |
1696 | } | |
1697 | } | |
1698 | FreeXid(xid); | |
1699 | return total_read; | |
1700 | } | |
1701 | ||
1702 | ||
1703 | static ssize_t cifs_read(struct file *file, char *read_data, size_t read_size, | |
1704 | loff_t *poffset) | |
1705 | { | |
1706 | int rc = -EACCES; | |
1707 | unsigned int bytes_read = 0; | |
1708 | unsigned int total_read; | |
1709 | unsigned int current_read_size; | |
1710 | struct cifs_sb_info *cifs_sb; | |
1711 | struct cifsTconInfo *pTcon; | |
1712 | int xid; | |
1713 | char *current_offset; | |
1714 | struct cifsFileInfo *open_file; | |
ec637e3f | 1715 | int buf_type = CIFS_NO_BUFFER; |
1da177e4 LT |
1716 | |
1717 | xid = GetXid(); | |
e6a00296 | 1718 | cifs_sb = CIFS_SB(file->f_path.dentry->d_sb); |
1da177e4 LT |
1719 | |
1720 | if (file->private_data == NULL) { | |
0f3bc09e | 1721 | rc = -EBADF; |
1da177e4 | 1722 | FreeXid(xid); |
0f3bc09e | 1723 | return rc; |
1da177e4 | 1724 | } |
c21dfb69 | 1725 | open_file = file->private_data; |
13cfb733 | 1726 | pTcon = tlink_tcon(open_file->tlink); |
1da177e4 LT |
1727 | |
1728 | if ((file->f_flags & O_ACCMODE) == O_WRONLY) | |
b6b38f70 | 1729 | cFYI(1, "attempting read on write only file instance"); |
1da177e4 | 1730 | |
fb8c4b14 | 1731 | for (total_read = 0, current_offset = read_data; |
1da177e4 LT |
1732 | read_size > total_read; |
1733 | total_read += bytes_read, current_offset += bytes_read) { | |
1734 | current_read_size = min_t(const int, read_size - total_read, | |
1735 | cifs_sb->rsize); | |
f9f5c817 SF |
1736 | /* For windows me and 9x we do not want to request more |
1737 | than it negotiated since it will refuse the read then */ | |
fb8c4b14 | 1738 | if ((pTcon->ses) && |
f9f5c817 SF |
1739 | !(pTcon->ses->capabilities & CAP_LARGE_FILES)) { |
1740 | current_read_size = min_t(const int, current_read_size, | |
1741 | pTcon->ses->server->maxBuf - 128); | |
1742 | } | |
1da177e4 LT |
1743 | rc = -EAGAIN; |
1744 | while (rc == -EAGAIN) { | |
cdff08e7 | 1745 | if (open_file->invalidHandle) { |
15886177 | 1746 | rc = cifs_reopen_file(open_file, true); |
1da177e4 LT |
1747 | if (rc != 0) |
1748 | break; | |
1749 | } | |
bfa0d75a | 1750 | rc = CIFSSMBRead(xid, pTcon, |
ec637e3f SF |
1751 | open_file->netfid, |
1752 | current_read_size, *poffset, | |
1753 | &bytes_read, ¤t_offset, | |
1754 | &buf_type); | |
1da177e4 LT |
1755 | } |
1756 | if (rc || (bytes_read == 0)) { | |
1757 | if (total_read) { | |
1758 | break; | |
1759 | } else { | |
1760 | FreeXid(xid); | |
1761 | return rc; | |
1762 | } | |
1763 | } else { | |
a4544347 | 1764 | cifs_stats_bytes_read(pTcon, total_read); |
1da177e4 LT |
1765 | *poffset += bytes_read; |
1766 | } | |
1767 | } | |
1768 | FreeXid(xid); | |
1769 | return total_read; | |
1770 | } | |
1771 | ||
7a6a19b1 PS |
1772 | int cifs_file_strict_mmap(struct file *file, struct vm_area_struct *vma) |
1773 | { | |
1774 | int rc, xid; | |
1775 | struct inode *inode = file->f_path.dentry->d_inode; | |
1776 | ||
1777 | xid = GetXid(); | |
1778 | ||
1779 | if (!CIFS_I(inode)->clientCanCacheRead) | |
1780 | cifs_invalidate_mapping(inode); | |
1781 | ||
1782 | rc = generic_file_mmap(file, vma); | |
1783 | FreeXid(xid); | |
1784 | return rc; | |
1785 | } | |
1786 | ||
1da177e4 LT |
1787 | int cifs_file_mmap(struct file *file, struct vm_area_struct *vma) |
1788 | { | |
1da177e4 LT |
1789 | int rc, xid; |
1790 | ||
1791 | xid = GetXid(); | |
abab095d | 1792 | rc = cifs_revalidate_file(file); |
1da177e4 | 1793 | if (rc) { |
b6b38f70 | 1794 | cFYI(1, "Validation prior to mmap failed, error=%d", rc); |
1da177e4 LT |
1795 | FreeXid(xid); |
1796 | return rc; | |
1797 | } | |
1798 | rc = generic_file_mmap(file, vma); | |
1799 | FreeXid(xid); | |
1800 | return rc; | |
1801 | } | |
1802 | ||
1803 | ||
fb8c4b14 | 1804 | static void cifs_copy_cache_pages(struct address_space *mapping, |
315e995c | 1805 | struct list_head *pages, int bytes_read, char *data) |
1da177e4 LT |
1806 | { |
1807 | struct page *page; | |
1808 | char *target; | |
1809 | ||
1810 | while (bytes_read > 0) { | |
1811 | if (list_empty(pages)) | |
1812 | break; | |
1813 | ||
1814 | page = list_entry(pages->prev, struct page, lru); | |
1815 | list_del(&page->lru); | |
1816 | ||
315e995c | 1817 | if (add_to_page_cache_lru(page, mapping, page->index, |
1da177e4 LT |
1818 | GFP_KERNEL)) { |
1819 | page_cache_release(page); | |
b6b38f70 | 1820 | cFYI(1, "Add page cache failed"); |
3079ca62 SF |
1821 | data += PAGE_CACHE_SIZE; |
1822 | bytes_read -= PAGE_CACHE_SIZE; | |
1da177e4 LT |
1823 | continue; |
1824 | } | |
06b43672 | 1825 | page_cache_release(page); |
1da177e4 | 1826 | |
fb8c4b14 | 1827 | target = kmap_atomic(page, KM_USER0); |
1da177e4 LT |
1828 | |
1829 | if (PAGE_CACHE_SIZE > bytes_read) { | |
1830 | memcpy(target, data, bytes_read); | |
1831 | /* zero the tail end of this partial page */ | |
fb8c4b14 | 1832 | memset(target + bytes_read, 0, |
1da177e4 LT |
1833 | PAGE_CACHE_SIZE - bytes_read); |
1834 | bytes_read = 0; | |
1835 | } else { | |
1836 | memcpy(target, data, PAGE_CACHE_SIZE); | |
1837 | bytes_read -= PAGE_CACHE_SIZE; | |
1838 | } | |
1839 | kunmap_atomic(target, KM_USER0); | |
1840 | ||
1841 | flush_dcache_page(page); | |
1842 | SetPageUptodate(page); | |
1843 | unlock_page(page); | |
1da177e4 | 1844 | data += PAGE_CACHE_SIZE; |
9dc06558 SJ |
1845 | |
1846 | /* add page to FS-Cache */ | |
1847 | cifs_readpage_to_fscache(mapping->host, page); | |
1da177e4 LT |
1848 | } |
1849 | return; | |
1850 | } | |
1851 | ||
1852 | static int cifs_readpages(struct file *file, struct address_space *mapping, | |
1853 | struct list_head *page_list, unsigned num_pages) | |
1854 | { | |
1855 | int rc = -EACCES; | |
1856 | int xid; | |
1857 | loff_t offset; | |
1858 | struct page *page; | |
1859 | struct cifs_sb_info *cifs_sb; | |
1860 | struct cifsTconInfo *pTcon; | |
2c2130e1 | 1861 | unsigned int bytes_read = 0; |
fb8c4b14 | 1862 | unsigned int read_size, i; |
1da177e4 LT |
1863 | char *smb_read_data = NULL; |
1864 | struct smb_com_read_rsp *pSMBr; | |
1da177e4 | 1865 | struct cifsFileInfo *open_file; |
ec637e3f | 1866 | int buf_type = CIFS_NO_BUFFER; |
1da177e4 LT |
1867 | |
1868 | xid = GetXid(); | |
1869 | if (file->private_data == NULL) { | |
0f3bc09e | 1870 | rc = -EBADF; |
1da177e4 | 1871 | FreeXid(xid); |
0f3bc09e | 1872 | return rc; |
1da177e4 | 1873 | } |
c21dfb69 | 1874 | open_file = file->private_data; |
e6a00296 | 1875 | cifs_sb = CIFS_SB(file->f_path.dentry->d_sb); |
13cfb733 | 1876 | pTcon = tlink_tcon(open_file->tlink); |
bfa0d75a | 1877 | |
56698236 SJ |
1878 | /* |
1879 | * Reads as many pages as possible from fscache. Returns -ENOBUFS | |
1880 | * immediately if the cookie is negative | |
1881 | */ | |
1882 | rc = cifs_readpages_from_fscache(mapping->host, mapping, page_list, | |
1883 | &num_pages); | |
1884 | if (rc == 0) | |
1885 | goto read_complete; | |
1886 | ||
f19159dc | 1887 | cFYI(DBG2, "rpages: num pages %d", num_pages); |
1da177e4 LT |
1888 | for (i = 0; i < num_pages; ) { |
1889 | unsigned contig_pages; | |
1890 | struct page *tmp_page; | |
1891 | unsigned long expected_index; | |
1892 | ||
1893 | if (list_empty(page_list)) | |
1894 | break; | |
1895 | ||
1896 | page = list_entry(page_list->prev, struct page, lru); | |
1897 | offset = (loff_t)page->index << PAGE_CACHE_SHIFT; | |
1898 | ||
1899 | /* count adjacent pages that we will read into */ | |
1900 | contig_pages = 0; | |
fb8c4b14 | 1901 | expected_index = |
1da177e4 | 1902 | list_entry(page_list->prev, struct page, lru)->index; |
fb8c4b14 | 1903 | list_for_each_entry_reverse(tmp_page, page_list, lru) { |
1da177e4 LT |
1904 | if (tmp_page->index == expected_index) { |
1905 | contig_pages++; | |
1906 | expected_index++; | |
1907 | } else | |
fb8c4b14 | 1908 | break; |
1da177e4 LT |
1909 | } |
1910 | if (contig_pages + i > num_pages) | |
1911 | contig_pages = num_pages - i; | |
1912 | ||
1913 | /* for reads over a certain size could initiate async | |
1914 | read ahead */ | |
1915 | ||
1916 | read_size = contig_pages * PAGE_CACHE_SIZE; | |
1917 | /* Read size needs to be in multiples of one page */ | |
1918 | read_size = min_t(const unsigned int, read_size, | |
1919 | cifs_sb->rsize & PAGE_CACHE_MASK); | |
b6b38f70 JP |
1920 | cFYI(DBG2, "rpages: read size 0x%x contiguous pages %d", |
1921 | read_size, contig_pages); | |
1da177e4 LT |
1922 | rc = -EAGAIN; |
1923 | while (rc == -EAGAIN) { | |
cdff08e7 | 1924 | if (open_file->invalidHandle) { |
15886177 | 1925 | rc = cifs_reopen_file(open_file, true); |
1da177e4 LT |
1926 | if (rc != 0) |
1927 | break; | |
1928 | } | |
1929 | ||
bfa0d75a | 1930 | rc = CIFSSMBRead(xid, pTcon, |
ec637e3f SF |
1931 | open_file->netfid, |
1932 | read_size, offset, | |
1933 | &bytes_read, &smb_read_data, | |
1934 | &buf_type); | |
a9d02ad4 | 1935 | /* BB more RC checks ? */ |
fb8c4b14 | 1936 | if (rc == -EAGAIN) { |
1da177e4 | 1937 | if (smb_read_data) { |
fb8c4b14 | 1938 | if (buf_type == CIFS_SMALL_BUFFER) |
ec637e3f | 1939 | cifs_small_buf_release(smb_read_data); |
fb8c4b14 | 1940 | else if (buf_type == CIFS_LARGE_BUFFER) |
ec637e3f | 1941 | cifs_buf_release(smb_read_data); |
1da177e4 LT |
1942 | smb_read_data = NULL; |
1943 | } | |
1944 | } | |
1945 | } | |
1946 | if ((rc < 0) || (smb_read_data == NULL)) { | |
b6b38f70 | 1947 | cFYI(1, "Read error in readpages: %d", rc); |
1da177e4 LT |
1948 | break; |
1949 | } else if (bytes_read > 0) { | |
6f88cc2e | 1950 | task_io_account_read(bytes_read); |
1da177e4 LT |
1951 | pSMBr = (struct smb_com_read_rsp *)smb_read_data; |
1952 | cifs_copy_cache_pages(mapping, page_list, bytes_read, | |
1953 | smb_read_data + 4 /* RFC1001 hdr */ + | |
315e995c | 1954 | le16_to_cpu(pSMBr->DataOffset)); |
1da177e4 LT |
1955 | |
1956 | i += bytes_read >> PAGE_CACHE_SHIFT; | |
a4544347 | 1957 | cifs_stats_bytes_read(pTcon, bytes_read); |
2c2130e1 | 1958 | if ((bytes_read & PAGE_CACHE_MASK) != bytes_read) { |
1da177e4 LT |
1959 | i++; /* account for partial page */ |
1960 | ||
fb8c4b14 | 1961 | /* server copy of file can have smaller size |
1da177e4 | 1962 | than client */ |
fb8c4b14 SF |
1963 | /* BB do we need to verify this common case ? |
1964 | this case is ok - if we are at server EOF | |
1da177e4 LT |
1965 | we will hit it on next read */ |
1966 | ||
05ac9d4b | 1967 | /* break; */ |
1da177e4 LT |
1968 | } |
1969 | } else { | |
b6b38f70 | 1970 | cFYI(1, "No bytes read (%d) at offset %lld . " |
f19159dc | 1971 | "Cleaning remaining pages from readahead list", |
b6b38f70 | 1972 | bytes_read, offset); |
fb8c4b14 | 1973 | /* BB turn off caching and do new lookup on |
1da177e4 | 1974 | file size at server? */ |
1da177e4 LT |
1975 | break; |
1976 | } | |
1977 | if (smb_read_data) { | |
fb8c4b14 | 1978 | if (buf_type == CIFS_SMALL_BUFFER) |
ec637e3f | 1979 | cifs_small_buf_release(smb_read_data); |
fb8c4b14 | 1980 | else if (buf_type == CIFS_LARGE_BUFFER) |
ec637e3f | 1981 | cifs_buf_release(smb_read_data); |
1da177e4 LT |
1982 | smb_read_data = NULL; |
1983 | } | |
1984 | bytes_read = 0; | |
1985 | } | |
1986 | ||
1da177e4 LT |
1987 | /* need to free smb_read_data buf before exit */ |
1988 | if (smb_read_data) { | |
fb8c4b14 | 1989 | if (buf_type == CIFS_SMALL_BUFFER) |
47c886b3 | 1990 | cifs_small_buf_release(smb_read_data); |
fb8c4b14 | 1991 | else if (buf_type == CIFS_LARGE_BUFFER) |
47c886b3 | 1992 | cifs_buf_release(smb_read_data); |
1da177e4 | 1993 | smb_read_data = NULL; |
fb8c4b14 | 1994 | } |
1da177e4 | 1995 | |
56698236 | 1996 | read_complete: |
1da177e4 LT |
1997 | FreeXid(xid); |
1998 | return rc; | |
1999 | } | |
2000 | ||
2001 | static int cifs_readpage_worker(struct file *file, struct page *page, | |
2002 | loff_t *poffset) | |
2003 | { | |
2004 | char *read_data; | |
2005 | int rc; | |
2006 | ||
56698236 SJ |
2007 | /* Is the page cached? */ |
2008 | rc = cifs_readpage_from_fscache(file->f_path.dentry->d_inode, page); | |
2009 | if (rc == 0) | |
2010 | goto read_complete; | |
2011 | ||
1da177e4 LT |
2012 | page_cache_get(page); |
2013 | read_data = kmap(page); | |
2014 | /* for reads over a certain size could initiate async read ahead */ | |
fb8c4b14 | 2015 | |
1da177e4 | 2016 | rc = cifs_read(file, read_data, PAGE_CACHE_SIZE, poffset); |
fb8c4b14 | 2017 | |
1da177e4 LT |
2018 | if (rc < 0) |
2019 | goto io_error; | |
2020 | else | |
b6b38f70 | 2021 | cFYI(1, "Bytes read %d", rc); |
fb8c4b14 | 2022 | |
e6a00296 JJS |
2023 | file->f_path.dentry->d_inode->i_atime = |
2024 | current_fs_time(file->f_path.dentry->d_inode->i_sb); | |
fb8c4b14 | 2025 | |
1da177e4 LT |
2026 | if (PAGE_CACHE_SIZE > rc) |
2027 | memset(read_data + rc, 0, PAGE_CACHE_SIZE - rc); | |
2028 | ||
2029 | flush_dcache_page(page); | |
2030 | SetPageUptodate(page); | |
9dc06558 SJ |
2031 | |
2032 | /* send this page to the cache */ | |
2033 | cifs_readpage_to_fscache(file->f_path.dentry->d_inode, page); | |
2034 | ||
1da177e4 | 2035 | rc = 0; |
fb8c4b14 | 2036 | |
1da177e4 | 2037 | io_error: |
fb8c4b14 | 2038 | kunmap(page); |
1da177e4 | 2039 | page_cache_release(page); |
56698236 SJ |
2040 | |
2041 | read_complete: | |
1da177e4 LT |
2042 | return rc; |
2043 | } | |
2044 | ||
2045 | static int cifs_readpage(struct file *file, struct page *page) | |
2046 | { | |
2047 | loff_t offset = (loff_t)page->index << PAGE_CACHE_SHIFT; | |
2048 | int rc = -EACCES; | |
2049 | int xid; | |
2050 | ||
2051 | xid = GetXid(); | |
2052 | ||
2053 | if (file->private_data == NULL) { | |
0f3bc09e | 2054 | rc = -EBADF; |
1da177e4 | 2055 | FreeXid(xid); |
0f3bc09e | 2056 | return rc; |
1da177e4 LT |
2057 | } |
2058 | ||
b6b38f70 JP |
2059 | cFYI(1, "readpage %p at offset %d 0x%x\n", |
2060 | page, (int)offset, (int)offset); | |
1da177e4 LT |
2061 | |
2062 | rc = cifs_readpage_worker(file, page, &offset); | |
2063 | ||
2064 | unlock_page(page); | |
2065 | ||
2066 | FreeXid(xid); | |
2067 | return rc; | |
2068 | } | |
2069 | ||
a403a0a3 SF |
2070 | static int is_inode_writable(struct cifsInodeInfo *cifs_inode) |
2071 | { | |
2072 | struct cifsFileInfo *open_file; | |
2073 | ||
4477288a | 2074 | spin_lock(&cifs_file_list_lock); |
a403a0a3 | 2075 | list_for_each_entry(open_file, &cifs_inode->openFileList, flist) { |
2e396b83 | 2076 | if (OPEN_FMODE(open_file->f_flags) & FMODE_WRITE) { |
4477288a | 2077 | spin_unlock(&cifs_file_list_lock); |
a403a0a3 SF |
2078 | return 1; |
2079 | } | |
2080 | } | |
4477288a | 2081 | spin_unlock(&cifs_file_list_lock); |
a403a0a3 SF |
2082 | return 0; |
2083 | } | |
2084 | ||
1da177e4 LT |
2085 | /* We do not want to update the file size from server for inodes |
2086 | open for write - to avoid races with writepage extending | |
2087 | the file - in the future we could consider allowing | |
fb8c4b14 | 2088 | refreshing the inode only on increases in the file size |
1da177e4 LT |
2089 | but this is tricky to do without racing with writebehind |
2090 | page caching in the current Linux kernel design */ | |
4b18f2a9 | 2091 | bool is_size_safe_to_change(struct cifsInodeInfo *cifsInode, __u64 end_of_file) |
1da177e4 | 2092 | { |
a403a0a3 | 2093 | if (!cifsInode) |
4b18f2a9 | 2094 | return true; |
50c2f753 | 2095 | |
a403a0a3 SF |
2096 | if (is_inode_writable(cifsInode)) { |
2097 | /* This inode is open for write at least once */ | |
c32a0b68 SF |
2098 | struct cifs_sb_info *cifs_sb; |
2099 | ||
c32a0b68 | 2100 | cifs_sb = CIFS_SB(cifsInode->vfs_inode.i_sb); |
ad7a2926 | 2101 | if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DIRECT_IO) { |
fb8c4b14 | 2102 | /* since no page cache to corrupt on directio |
c32a0b68 | 2103 | we can change size safely */ |
4b18f2a9 | 2104 | return true; |
c32a0b68 SF |
2105 | } |
2106 | ||
fb8c4b14 | 2107 | if (i_size_read(&cifsInode->vfs_inode) < end_of_file) |
4b18f2a9 | 2108 | return true; |
7ba52631 | 2109 | |
4b18f2a9 | 2110 | return false; |
23e7dd7d | 2111 | } else |
4b18f2a9 | 2112 | return true; |
1da177e4 LT |
2113 | } |
2114 | ||
d9414774 NP |
2115 | static int cifs_write_begin(struct file *file, struct address_space *mapping, |
2116 | loff_t pos, unsigned len, unsigned flags, | |
2117 | struct page **pagep, void **fsdata) | |
1da177e4 | 2118 | { |
d9414774 NP |
2119 | pgoff_t index = pos >> PAGE_CACHE_SHIFT; |
2120 | loff_t offset = pos & (PAGE_CACHE_SIZE - 1); | |
a98ee8c1 JL |
2121 | loff_t page_start = pos & PAGE_MASK; |
2122 | loff_t i_size; | |
2123 | struct page *page; | |
2124 | int rc = 0; | |
d9414774 | 2125 | |
b6b38f70 | 2126 | cFYI(1, "write_begin from %lld len %d", (long long)pos, len); |
d9414774 | 2127 | |
54566b2c | 2128 | page = grab_cache_page_write_begin(mapping, index, flags); |
a98ee8c1 JL |
2129 | if (!page) { |
2130 | rc = -ENOMEM; | |
2131 | goto out; | |
2132 | } | |
8a236264 | 2133 | |
a98ee8c1 JL |
2134 | if (PageUptodate(page)) |
2135 | goto out; | |
8a236264 | 2136 | |
a98ee8c1 JL |
2137 | /* |
2138 | * If we write a full page it will be up to date, no need to read from | |
2139 | * the server. If the write is short, we'll end up doing a sync write | |
2140 | * instead. | |
2141 | */ | |
2142 | if (len == PAGE_CACHE_SIZE) | |
2143 | goto out; | |
8a236264 | 2144 | |
a98ee8c1 JL |
2145 | /* |
2146 | * optimize away the read when we have an oplock, and we're not | |
2147 | * expecting to use any of the data we'd be reading in. That | |
2148 | * is, when the page lies beyond the EOF, or straddles the EOF | |
2149 | * and the write will cover all of the existing data. | |
2150 | */ | |
2151 | if (CIFS_I(mapping->host)->clientCanCacheRead) { | |
2152 | i_size = i_size_read(mapping->host); | |
2153 | if (page_start >= i_size || | |
2154 | (offset == 0 && (pos + len) >= i_size)) { | |
2155 | zero_user_segments(page, 0, offset, | |
2156 | offset + len, | |
2157 | PAGE_CACHE_SIZE); | |
2158 | /* | |
2159 | * PageChecked means that the parts of the page | |
2160 | * to which we're not writing are considered up | |
2161 | * to date. Once the data is copied to the | |
2162 | * page, it can be set uptodate. | |
2163 | */ | |
2164 | SetPageChecked(page); | |
2165 | goto out; | |
2166 | } | |
2167 | } | |
d9414774 | 2168 | |
a98ee8c1 JL |
2169 | if ((file->f_flags & O_ACCMODE) != O_WRONLY) { |
2170 | /* | |
2171 | * might as well read a page, it is fast enough. If we get | |
2172 | * an error, we don't need to return it. cifs_write_end will | |
2173 | * do a sync write instead since PG_uptodate isn't set. | |
2174 | */ | |
2175 | cifs_readpage_worker(file, page, &page_start); | |
8a236264 SF |
2176 | } else { |
2177 | /* we could try using another file handle if there is one - | |
2178 | but how would we lock it to prevent close of that handle | |
2179 | racing with this read? In any case | |
d9414774 | 2180 | this will be written out by write_end so is fine */ |
1da177e4 | 2181 | } |
a98ee8c1 JL |
2182 | out: |
2183 | *pagep = page; | |
2184 | return rc; | |
1da177e4 LT |
2185 | } |
2186 | ||
85f2d6b4 SJ |
2187 | static int cifs_release_page(struct page *page, gfp_t gfp) |
2188 | { | |
2189 | if (PagePrivate(page)) | |
2190 | return 0; | |
2191 | ||
2192 | return cifs_fscache_release_page(page, gfp); | |
2193 | } | |
2194 | ||
2195 | static void cifs_invalidate_page(struct page *page, unsigned long offset) | |
2196 | { | |
2197 | struct cifsInodeInfo *cifsi = CIFS_I(page->mapping->host); | |
2198 | ||
2199 | if (offset == 0) | |
2200 | cifs_fscache_invalidate_page(page, &cifsi->vfs_inode); | |
2201 | } | |
2202 | ||
9b646972 | 2203 | void cifs_oplock_break(struct work_struct *work) |
3bc303c2 JL |
2204 | { |
2205 | struct cifsFileInfo *cfile = container_of(work, struct cifsFileInfo, | |
2206 | oplock_break); | |
a5e18bc3 | 2207 | struct inode *inode = cfile->dentry->d_inode; |
3bc303c2 | 2208 | struct cifsInodeInfo *cinode = CIFS_I(inode); |
eb4b756b | 2209 | int rc = 0; |
3bc303c2 JL |
2210 | |
2211 | if (inode && S_ISREG(inode->i_mode)) { | |
d54ff732 | 2212 | if (cinode->clientCanCacheRead) |
8737c930 | 2213 | break_lease(inode, O_RDONLY); |
d54ff732 | 2214 | else |
8737c930 | 2215 | break_lease(inode, O_WRONLY); |
3bc303c2 JL |
2216 | rc = filemap_fdatawrite(inode->i_mapping); |
2217 | if (cinode->clientCanCacheRead == 0) { | |
eb4b756b JL |
2218 | rc = filemap_fdatawait(inode->i_mapping); |
2219 | mapping_set_error(inode->i_mapping, rc); | |
3bc303c2 JL |
2220 | invalidate_remote_inode(inode); |
2221 | } | |
b6b38f70 | 2222 | cFYI(1, "Oplock flush inode %p rc %d", inode, rc); |
3bc303c2 JL |
2223 | } |
2224 | ||
2225 | /* | |
2226 | * releasing stale oplock after recent reconnect of smb session using | |
2227 | * a now incorrect file handle is not a data integrity issue but do | |
2228 | * not bother sending an oplock release if session to server still is | |
2229 | * disconnected since oplock already released by the server | |
2230 | */ | |
cdff08e7 | 2231 | if (!cfile->oplock_break_cancelled) { |
13cfb733 | 2232 | rc = CIFSSMBLock(0, tlink_tcon(cfile->tlink), cfile->netfid, 0, |
12fed00d PS |
2233 | 0, 0, 0, LOCKING_ANDX_OPLOCK_RELEASE, false, |
2234 | cinode->clientCanCacheRead ? 1 : 0); | |
b6b38f70 | 2235 | cFYI(1, "Oplock release rc = %d", rc); |
3bc303c2 | 2236 | } |
9b646972 TH |
2237 | |
2238 | /* | |
2239 | * We might have kicked in before is_valid_oplock_break() | |
2240 | * finished grabbing reference for us. Make sure it's done by | |
6573e9b7 | 2241 | * waiting for cifs_file_list_lock. |
9b646972 | 2242 | */ |
4477288a JL |
2243 | spin_lock(&cifs_file_list_lock); |
2244 | spin_unlock(&cifs_file_list_lock); | |
9b646972 TH |
2245 | |
2246 | cifs_oplock_break_put(cfile); | |
3bc303c2 JL |
2247 | } |
2248 | ||
5f6dbc9e | 2249 | /* must be called while holding cifs_file_list_lock */ |
9b646972 | 2250 | void cifs_oplock_break_get(struct cifsFileInfo *cfile) |
3bc303c2 | 2251 | { |
d7c86ff8 | 2252 | cifs_sb_active(cfile->dentry->d_sb); |
3bc303c2 | 2253 | cifsFileInfo_get(cfile); |
3bc303c2 JL |
2254 | } |
2255 | ||
9b646972 | 2256 | void cifs_oplock_break_put(struct cifsFileInfo *cfile) |
3bc303c2 | 2257 | { |
ebe2e91e JL |
2258 | struct super_block *sb = cfile->dentry->d_sb; |
2259 | ||
3bc303c2 | 2260 | cifsFileInfo_put(cfile); |
ebe2e91e | 2261 | cifs_sb_deactive(sb); |
3bc303c2 JL |
2262 | } |
2263 | ||
f5e54d6e | 2264 | const struct address_space_operations cifs_addr_ops = { |
1da177e4 LT |
2265 | .readpage = cifs_readpage, |
2266 | .readpages = cifs_readpages, | |
2267 | .writepage = cifs_writepage, | |
37c0eb46 | 2268 | .writepages = cifs_writepages, |
d9414774 NP |
2269 | .write_begin = cifs_write_begin, |
2270 | .write_end = cifs_write_end, | |
1da177e4 | 2271 | .set_page_dirty = __set_page_dirty_nobuffers, |
85f2d6b4 SJ |
2272 | .releasepage = cifs_release_page, |
2273 | .invalidatepage = cifs_invalidate_page, | |
1da177e4 LT |
2274 | /* .sync_page = cifs_sync_page, */ |
2275 | /* .direct_IO = */ | |
2276 | }; | |
273d81d6 DK |
2277 | |
2278 | /* | |
2279 | * cifs_readpages requires the server to support a buffer large enough to | |
2280 | * contain the header plus one complete page of data. Otherwise, we need | |
2281 | * to leave cifs_readpages out of the address space operations. | |
2282 | */ | |
f5e54d6e | 2283 | const struct address_space_operations cifs_addr_ops_smallbuf = { |
273d81d6 DK |
2284 | .readpage = cifs_readpage, |
2285 | .writepage = cifs_writepage, | |
2286 | .writepages = cifs_writepages, | |
d9414774 NP |
2287 | .write_begin = cifs_write_begin, |
2288 | .write_end = cifs_write_end, | |
273d81d6 | 2289 | .set_page_dirty = __set_page_dirty_nobuffers, |
85f2d6b4 SJ |
2290 | .releasepage = cifs_release_page, |
2291 | .invalidatepage = cifs_invalidate_page, | |
273d81d6 DK |
2292 | /* .sync_page = cifs_sync_page, */ |
2293 | /* .direct_IO = */ | |
2294 | }; |