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; | |
96daf2b0 | 117 | struct cifs_tcon *tcon; |
608712fe JL |
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, | |
96daf2b0 | 171 | struct cifs_tcon *tcon, unsigned int f_flags, __u32 *poplock, |
eeb910a6 PS |
172 | __u16 *pnetfid, int xid) |
173 | { | |
174 | int rc; | |
175 | int desiredAccess; | |
176 | int disposition; | |
3d3ea8e6 | 177 | int create_options = CREATE_NOT_DIR; |
eeb910a6 PS |
178 | FILE_ALL_INFO *buf; |
179 | ||
180 | desiredAccess = cifs_convert_flags(f_flags); | |
181 | ||
182 | /********************************************************************* | |
183 | * open flag mapping table: | |
184 | * | |
185 | * POSIX Flag CIFS Disposition | |
186 | * ---------- ---------------- | |
187 | * O_CREAT FILE_OPEN_IF | |
188 | * O_CREAT | O_EXCL FILE_CREATE | |
189 | * O_CREAT | O_TRUNC FILE_OVERWRITE_IF | |
190 | * O_TRUNC FILE_OVERWRITE | |
191 | * none of the above FILE_OPEN | |
192 | * | |
193 | * Note that there is not a direct match between disposition | |
194 | * FILE_SUPERSEDE (ie create whether or not file exists although | |
195 | * O_CREAT | O_TRUNC is similar but truncates the existing | |
196 | * file rather than creating a new file as FILE_SUPERSEDE does | |
197 | * (which uses the attributes / metadata passed in on open call) | |
198 | *? | |
199 | *? O_SYNC is a reasonable match to CIFS writethrough flag | |
200 | *? and the read write flags match reasonably. O_LARGEFILE | |
201 | *? is irrelevant because largefile support is always used | |
202 | *? by this client. Flags O_APPEND, O_DIRECT, O_DIRECTORY, | |
203 | * O_FASYNC, O_NOFOLLOW, O_NONBLOCK need further investigation | |
204 | *********************************************************************/ | |
205 | ||
206 | disposition = cifs_get_disposition(f_flags); | |
207 | ||
208 | /* BB pass O_SYNC flag through on file attributes .. BB */ | |
209 | ||
210 | buf = kmalloc(sizeof(FILE_ALL_INFO), GFP_KERNEL); | |
211 | if (!buf) | |
212 | return -ENOMEM; | |
213 | ||
3d3ea8e6 SP |
214 | if (backup_cred(cifs_sb)) |
215 | create_options |= CREATE_OPEN_BACKUP_INTENT; | |
216 | ||
eeb910a6 PS |
217 | if (tcon->ses->capabilities & CAP_NT_SMBS) |
218 | rc = CIFSSMBOpen(xid, tcon, full_path, disposition, | |
3d3ea8e6 | 219 | desiredAccess, create_options, pnetfid, poplock, buf, |
eeb910a6 PS |
220 | cifs_sb->local_nls, cifs_sb->mnt_cifs_flags |
221 | & CIFS_MOUNT_MAP_SPECIAL_CHR); | |
222 | else | |
223 | rc = SMBLegacyOpen(xid, tcon, full_path, disposition, | |
224 | desiredAccess, CREATE_NOT_DIR, pnetfid, poplock, buf, | |
225 | cifs_sb->local_nls, cifs_sb->mnt_cifs_flags | |
226 | & CIFS_MOUNT_MAP_SPECIAL_CHR); | |
227 | ||
228 | if (rc) | |
229 | goto out; | |
230 | ||
231 | if (tcon->unix_ext) | |
232 | rc = cifs_get_inode_info_unix(&inode, full_path, inode->i_sb, | |
233 | xid); | |
234 | else | |
235 | rc = cifs_get_inode_info(&inode, full_path, buf, inode->i_sb, | |
236 | xid, pnetfid); | |
237 | ||
238 | out: | |
239 | kfree(buf); | |
240 | return rc; | |
241 | } | |
242 | ||
15ecb436 JL |
243 | struct cifsFileInfo * |
244 | cifs_new_fileinfo(__u16 fileHandle, struct file *file, | |
245 | struct tcon_link *tlink, __u32 oplock) | |
246 | { | |
247 | struct dentry *dentry = file->f_path.dentry; | |
248 | struct inode *inode = dentry->d_inode; | |
249 | struct cifsInodeInfo *pCifsInode = CIFS_I(inode); | |
250 | struct cifsFileInfo *pCifsFile; | |
251 | ||
252 | pCifsFile = kzalloc(sizeof(struct cifsFileInfo), GFP_KERNEL); | |
253 | if (pCifsFile == NULL) | |
254 | return pCifsFile; | |
255 | ||
5f6dbc9e | 256 | pCifsFile->count = 1; |
15ecb436 JL |
257 | pCifsFile->netfid = fileHandle; |
258 | pCifsFile->pid = current->tgid; | |
259 | pCifsFile->uid = current_fsuid(); | |
260 | pCifsFile->dentry = dget(dentry); | |
261 | pCifsFile->f_flags = file->f_flags; | |
262 | pCifsFile->invalidHandle = false; | |
15ecb436 JL |
263 | pCifsFile->tlink = cifs_get_tlink(tlink); |
264 | mutex_init(&pCifsFile->fh_mutex); | |
15ecb436 JL |
265 | INIT_WORK(&pCifsFile->oplock_break, cifs_oplock_break); |
266 | ||
4477288a | 267 | spin_lock(&cifs_file_list_lock); |
15ecb436 JL |
268 | list_add(&pCifsFile->tlist, &(tlink_tcon(tlink)->openFileList)); |
269 | /* if readable file instance put first in list*/ | |
270 | if (file->f_mode & FMODE_READ) | |
271 | list_add(&pCifsFile->flist, &pCifsInode->openFileList); | |
272 | else | |
273 | list_add_tail(&pCifsFile->flist, &pCifsInode->openFileList); | |
4477288a | 274 | spin_unlock(&cifs_file_list_lock); |
15ecb436 | 275 | |
c6723628 | 276 | cifs_set_oplock_level(pCifsInode, oplock); |
15ecb436 JL |
277 | |
278 | file->private_data = pCifsFile; | |
279 | return pCifsFile; | |
280 | } | |
281 | ||
cdff08e7 SF |
282 | /* |
283 | * Release a reference on the file private data. This may involve closing | |
5f6dbc9e JL |
284 | * the filehandle out on the server. Must be called without holding |
285 | * cifs_file_list_lock. | |
cdff08e7 | 286 | */ |
b33879aa JL |
287 | void cifsFileInfo_put(struct cifsFileInfo *cifs_file) |
288 | { | |
e66673e3 | 289 | struct inode *inode = cifs_file->dentry->d_inode; |
96daf2b0 | 290 | struct cifs_tcon *tcon = tlink_tcon(cifs_file->tlink); |
e66673e3 | 291 | struct cifsInodeInfo *cifsi = CIFS_I(inode); |
4f8ba8a0 | 292 | struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb); |
cdff08e7 SF |
293 | struct cifsLockInfo *li, *tmp; |
294 | ||
295 | spin_lock(&cifs_file_list_lock); | |
5f6dbc9e | 296 | if (--cifs_file->count > 0) { |
cdff08e7 SF |
297 | spin_unlock(&cifs_file_list_lock); |
298 | return; | |
299 | } | |
300 | ||
301 | /* remove it from the lists */ | |
302 | list_del(&cifs_file->flist); | |
303 | list_del(&cifs_file->tlist); | |
304 | ||
305 | if (list_empty(&cifsi->openFileList)) { | |
306 | cFYI(1, "closing last open instance for inode %p", | |
307 | cifs_file->dentry->d_inode); | |
4f8ba8a0 PS |
308 | |
309 | /* in strict cache mode we need invalidate mapping on the last | |
310 | close because it may cause a error when we open this file | |
311 | again and get at least level II oplock */ | |
312 | if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_STRICT_IO) | |
313 | CIFS_I(inode)->invalid_mapping = true; | |
314 | ||
c6723628 | 315 | cifs_set_oplock_level(cifsi, 0); |
cdff08e7 SF |
316 | } |
317 | spin_unlock(&cifs_file_list_lock); | |
318 | ||
ad635942 JL |
319 | cancel_work_sync(&cifs_file->oplock_break); |
320 | ||
cdff08e7 SF |
321 | if (!tcon->need_reconnect && !cifs_file->invalidHandle) { |
322 | int xid, rc; | |
323 | ||
324 | xid = GetXid(); | |
325 | rc = CIFSSMBClose(xid, tcon, cifs_file->netfid); | |
326 | FreeXid(xid); | |
327 | } | |
328 | ||
329 | /* Delete any outstanding lock records. We'll lose them when the file | |
330 | * is closed anyway. | |
331 | */ | |
d59dad2b PS |
332 | mutex_lock(&cifsi->lock_mutex); |
333 | list_for_each_entry_safe(li, tmp, &cifsi->llist, llist) { | |
334 | if (li->netfid != cifs_file->netfid) | |
335 | continue; | |
cdff08e7 SF |
336 | list_del(&li->llist); |
337 | kfree(li); | |
b33879aa | 338 | } |
d59dad2b | 339 | mutex_unlock(&cifsi->lock_mutex); |
cdff08e7 SF |
340 | |
341 | cifs_put_tlink(cifs_file->tlink); | |
342 | dput(cifs_file->dentry); | |
343 | kfree(cifs_file); | |
b33879aa JL |
344 | } |
345 | ||
1da177e4 LT |
346 | int cifs_open(struct inode *inode, struct file *file) |
347 | { | |
348 | int rc = -EACCES; | |
590a3fe0 JL |
349 | int xid; |
350 | __u32 oplock; | |
1da177e4 | 351 | struct cifs_sb_info *cifs_sb; |
96daf2b0 | 352 | struct cifs_tcon *tcon; |
7ffec372 | 353 | struct tcon_link *tlink; |
6ca9f3ba | 354 | struct cifsFileInfo *pCifsFile = NULL; |
1da177e4 | 355 | char *full_path = NULL; |
7e12eddb | 356 | bool posix_open_ok = false; |
1da177e4 | 357 | __u16 netfid; |
1da177e4 LT |
358 | |
359 | xid = GetXid(); | |
360 | ||
361 | cifs_sb = CIFS_SB(inode->i_sb); | |
7ffec372 JL |
362 | tlink = cifs_sb_tlink(cifs_sb); |
363 | if (IS_ERR(tlink)) { | |
364 | FreeXid(xid); | |
365 | return PTR_ERR(tlink); | |
366 | } | |
367 | tcon = tlink_tcon(tlink); | |
1da177e4 | 368 | |
e6a00296 | 369 | full_path = build_path_from_dentry(file->f_path.dentry); |
1da177e4 | 370 | if (full_path == NULL) { |
0f3bc09e | 371 | rc = -ENOMEM; |
232341ba | 372 | goto out; |
1da177e4 LT |
373 | } |
374 | ||
b6b38f70 JP |
375 | cFYI(1, "inode = 0x%p file flags are 0x%x for %s", |
376 | inode, file->f_flags, full_path); | |
276a74a4 | 377 | |
e7504734 | 378 | if (enable_oplocks) |
276a74a4 SF |
379 | oplock = REQ_OPLOCK; |
380 | else | |
381 | oplock = 0; | |
382 | ||
64cc2c63 SF |
383 | if (!tcon->broken_posix_open && tcon->unix_ext && |
384 | (tcon->ses->capabilities & CAP_UNIX) && | |
276a74a4 SF |
385 | (CIFS_UNIX_POSIX_PATH_OPS_CAP & |
386 | le64_to_cpu(tcon->fsUnixInfo.Capability))) { | |
276a74a4 | 387 | /* can not refresh inode info since size could be stale */ |
2422f676 | 388 | rc = cifs_posix_open(full_path, &inode, inode->i_sb, |
fa588e0c | 389 | cifs_sb->mnt_file_mode /* ignored */, |
608712fe | 390 | file->f_flags, &oplock, &netfid, xid); |
276a74a4 | 391 | if (rc == 0) { |
b6b38f70 | 392 | cFYI(1, "posix open succeeded"); |
7e12eddb | 393 | posix_open_ok = true; |
64cc2c63 SF |
394 | } else if ((rc == -EINVAL) || (rc == -EOPNOTSUPP)) { |
395 | if (tcon->ses->serverNOS) | |
b6b38f70 | 396 | cERROR(1, "server %s of type %s returned" |
64cc2c63 SF |
397 | " unexpected error on SMB posix open" |
398 | ", disabling posix open support." | |
399 | " Check if server update available.", | |
400 | tcon->ses->serverName, | |
b6b38f70 | 401 | tcon->ses->serverNOS); |
64cc2c63 | 402 | tcon->broken_posix_open = true; |
276a74a4 SF |
403 | } else if ((rc != -EIO) && (rc != -EREMOTE) && |
404 | (rc != -EOPNOTSUPP)) /* path not found or net err */ | |
405 | goto out; | |
64cc2c63 SF |
406 | /* else fallthrough to retry open the old way on network i/o |
407 | or DFS errors */ | |
276a74a4 SF |
408 | } |
409 | ||
7e12eddb PS |
410 | if (!posix_open_ok) { |
411 | rc = cifs_nt_open(full_path, inode, cifs_sb, tcon, | |
412 | file->f_flags, &oplock, &netfid, xid); | |
413 | if (rc) | |
414 | goto out; | |
415 | } | |
47c78b7f | 416 | |
abfe1eed | 417 | pCifsFile = cifs_new_fileinfo(netfid, file, tlink, oplock); |
6ca9f3ba | 418 | if (pCifsFile == NULL) { |
7e12eddb | 419 | CIFSSMBClose(xid, tcon, netfid); |
1da177e4 LT |
420 | rc = -ENOMEM; |
421 | goto out; | |
422 | } | |
1da177e4 | 423 | |
9451a9a5 SJ |
424 | cifs_fscache_set_inode_cookie(inode, file); |
425 | ||
7e12eddb | 426 | if ((oplock & CIFS_CREATE_ACTION) && !posix_open_ok && tcon->unix_ext) { |
1da177e4 LT |
427 | /* time to set mode which we can not set earlier due to |
428 | problems creating new read-only files */ | |
7e12eddb PS |
429 | struct cifs_unix_set_info_args args = { |
430 | .mode = inode->i_mode, | |
431 | .uid = NO_CHANGE_64, | |
432 | .gid = NO_CHANGE_64, | |
433 | .ctime = NO_CHANGE_64, | |
434 | .atime = NO_CHANGE_64, | |
435 | .mtime = NO_CHANGE_64, | |
436 | .device = 0, | |
437 | }; | |
d44a9fe2 JL |
438 | CIFSSMBUnixSetFileInfo(xid, tcon, &args, netfid, |
439 | pCifsFile->pid); | |
1da177e4 LT |
440 | } |
441 | ||
442 | out: | |
1da177e4 LT |
443 | kfree(full_path); |
444 | FreeXid(xid); | |
7ffec372 | 445 | cifs_put_tlink(tlink); |
1da177e4 LT |
446 | return rc; |
447 | } | |
448 | ||
0418726b | 449 | /* Try to reacquire byte range locks that were released when session */ |
1da177e4 LT |
450 | /* to server was lost */ |
451 | static int cifs_relock_file(struct cifsFileInfo *cifsFile) | |
452 | { | |
453 | int rc = 0; | |
454 | ||
455 | /* BB list all locks open on this file and relock */ | |
456 | ||
457 | return rc; | |
458 | } | |
459 | ||
15886177 | 460 | static int cifs_reopen_file(struct cifsFileInfo *pCifsFile, bool can_flush) |
1da177e4 LT |
461 | { |
462 | int rc = -EACCES; | |
590a3fe0 JL |
463 | int xid; |
464 | __u32 oplock; | |
1da177e4 | 465 | struct cifs_sb_info *cifs_sb; |
96daf2b0 | 466 | struct cifs_tcon *tcon; |
1da177e4 | 467 | struct cifsInodeInfo *pCifsInode; |
fb8c4b14 | 468 | struct inode *inode; |
1da177e4 LT |
469 | char *full_path = NULL; |
470 | int desiredAccess; | |
471 | int disposition = FILE_OPEN; | |
3d3ea8e6 | 472 | int create_options = CREATE_NOT_DIR; |
1da177e4 LT |
473 | __u16 netfid; |
474 | ||
1da177e4 | 475 | xid = GetXid(); |
f0a71eb8 | 476 | mutex_lock(&pCifsFile->fh_mutex); |
4b18f2a9 | 477 | if (!pCifsFile->invalidHandle) { |
f0a71eb8 | 478 | mutex_unlock(&pCifsFile->fh_mutex); |
0f3bc09e | 479 | rc = 0; |
1da177e4 | 480 | FreeXid(xid); |
0f3bc09e | 481 | return rc; |
1da177e4 LT |
482 | } |
483 | ||
15886177 | 484 | inode = pCifsFile->dentry->d_inode; |
1da177e4 | 485 | cifs_sb = CIFS_SB(inode->i_sb); |
13cfb733 | 486 | tcon = tlink_tcon(pCifsFile->tlink); |
3a9f462f | 487 | |
1da177e4 LT |
488 | /* can not grab rename sem here because various ops, including |
489 | those that already have the rename sem can end up causing writepage | |
490 | to get called and if the server was down that means we end up here, | |
491 | and we can never tell if the caller already has the rename_sem */ | |
15886177 | 492 | full_path = build_path_from_dentry(pCifsFile->dentry); |
1da177e4 | 493 | if (full_path == NULL) { |
3a9f462f | 494 | rc = -ENOMEM; |
f0a71eb8 | 495 | mutex_unlock(&pCifsFile->fh_mutex); |
1da177e4 | 496 | FreeXid(xid); |
3a9f462f | 497 | return rc; |
1da177e4 LT |
498 | } |
499 | ||
b6b38f70 | 500 | cFYI(1, "inode = 0x%p file flags 0x%x for %s", |
15886177 | 501 | inode, pCifsFile->f_flags, full_path); |
1da177e4 | 502 | |
e7504734 | 503 | if (enable_oplocks) |
1da177e4 LT |
504 | oplock = REQ_OPLOCK; |
505 | else | |
4b18f2a9 | 506 | oplock = 0; |
1da177e4 | 507 | |
7fc8f4e9 SF |
508 | if (tcon->unix_ext && (tcon->ses->capabilities & CAP_UNIX) && |
509 | (CIFS_UNIX_POSIX_PATH_OPS_CAP & | |
510 | le64_to_cpu(tcon->fsUnixInfo.Capability))) { | |
608712fe JL |
511 | |
512 | /* | |
513 | * O_CREAT, O_EXCL and O_TRUNC already had their effect on the | |
514 | * original open. Must mask them off for a reopen. | |
515 | */ | |
15886177 JL |
516 | unsigned int oflags = pCifsFile->f_flags & |
517 | ~(O_CREAT | O_EXCL | O_TRUNC); | |
608712fe | 518 | |
2422f676 | 519 | rc = cifs_posix_open(full_path, NULL, inode->i_sb, |
fa588e0c SF |
520 | cifs_sb->mnt_file_mode /* ignored */, |
521 | oflags, &oplock, &netfid, xid); | |
7fc8f4e9 | 522 | if (rc == 0) { |
b6b38f70 | 523 | cFYI(1, "posix reopen succeeded"); |
7fc8f4e9 SF |
524 | goto reopen_success; |
525 | } | |
526 | /* fallthrough to retry open the old way on errors, especially | |
527 | in the reconnect path it is important to retry hard */ | |
528 | } | |
529 | ||
15886177 | 530 | desiredAccess = cifs_convert_flags(pCifsFile->f_flags); |
7fc8f4e9 | 531 | |
3d3ea8e6 SP |
532 | if (backup_cred(cifs_sb)) |
533 | create_options |= CREATE_OPEN_BACKUP_INTENT; | |
534 | ||
1da177e4 | 535 | /* Can not refresh inode by passing in file_info buf to be returned |
fb8c4b14 SF |
536 | by SMBOpen and then calling get_inode_info with returned buf |
537 | since file might have write behind data that needs to be flushed | |
1da177e4 LT |
538 | and server version of file size can be stale. If we knew for sure |
539 | that inode was not dirty locally we could do this */ | |
540 | ||
7fc8f4e9 | 541 | rc = CIFSSMBOpen(xid, tcon, full_path, disposition, desiredAccess, |
3d3ea8e6 | 542 | create_options, &netfid, &oplock, NULL, |
fb8c4b14 | 543 | cifs_sb->local_nls, cifs_sb->mnt_cifs_flags & |
737b758c | 544 | CIFS_MOUNT_MAP_SPECIAL_CHR); |
1da177e4 | 545 | if (rc) { |
f0a71eb8 | 546 | mutex_unlock(&pCifsFile->fh_mutex); |
b6b38f70 JP |
547 | cFYI(1, "cifs_open returned 0x%x", rc); |
548 | cFYI(1, "oplock: %d", oplock); | |
15886177 JL |
549 | goto reopen_error_exit; |
550 | } | |
551 | ||
7fc8f4e9 | 552 | reopen_success: |
15886177 JL |
553 | pCifsFile->netfid = netfid; |
554 | pCifsFile->invalidHandle = false; | |
555 | mutex_unlock(&pCifsFile->fh_mutex); | |
556 | pCifsInode = CIFS_I(inode); | |
557 | ||
558 | if (can_flush) { | |
559 | rc = filemap_write_and_wait(inode->i_mapping); | |
eb4b756b | 560 | mapping_set_error(inode->i_mapping, rc); |
15886177 | 561 | |
15886177 JL |
562 | if (tcon->unix_ext) |
563 | rc = cifs_get_inode_info_unix(&inode, | |
564 | full_path, inode->i_sb, xid); | |
565 | else | |
566 | rc = cifs_get_inode_info(&inode, | |
567 | full_path, NULL, inode->i_sb, | |
568 | xid, NULL); | |
569 | } /* else we are writing out data to server already | |
570 | and could deadlock if we tried to flush data, and | |
571 | since we do not know if we have data that would | |
572 | invalidate the current end of file on the server | |
573 | we can not go to the server to get the new inod | |
574 | info */ | |
e66673e3 | 575 | |
c6723628 | 576 | cifs_set_oplock_level(pCifsInode, oplock); |
e66673e3 | 577 | |
15886177 JL |
578 | cifs_relock_file(pCifsFile); |
579 | ||
580 | reopen_error_exit: | |
1da177e4 LT |
581 | kfree(full_path); |
582 | FreeXid(xid); | |
583 | return rc; | |
584 | } | |
585 | ||
586 | int cifs_close(struct inode *inode, struct file *file) | |
587 | { | |
77970693 JL |
588 | if (file->private_data != NULL) { |
589 | cifsFileInfo_put(file->private_data); | |
590 | file->private_data = NULL; | |
591 | } | |
7ee1af76 | 592 | |
cdff08e7 SF |
593 | /* return code from the ->release op is always ignored */ |
594 | return 0; | |
1da177e4 LT |
595 | } |
596 | ||
597 | int cifs_closedir(struct inode *inode, struct file *file) | |
598 | { | |
599 | int rc = 0; | |
600 | int xid; | |
c21dfb69 | 601 | struct cifsFileInfo *pCFileStruct = file->private_data; |
1da177e4 LT |
602 | char *ptmp; |
603 | ||
b6b38f70 | 604 | cFYI(1, "Closedir inode = 0x%p", inode); |
1da177e4 LT |
605 | |
606 | xid = GetXid(); | |
607 | ||
608 | if (pCFileStruct) { | |
96daf2b0 | 609 | struct cifs_tcon *pTcon = tlink_tcon(pCFileStruct->tlink); |
1da177e4 | 610 | |
b6b38f70 | 611 | cFYI(1, "Freeing private data in close dir"); |
4477288a | 612 | spin_lock(&cifs_file_list_lock); |
4b18f2a9 SF |
613 | if (!pCFileStruct->srch_inf.endOfSearch && |
614 | !pCFileStruct->invalidHandle) { | |
615 | pCFileStruct->invalidHandle = true; | |
4477288a | 616 | spin_unlock(&cifs_file_list_lock); |
1da177e4 | 617 | rc = CIFSFindClose(xid, pTcon, pCFileStruct->netfid); |
b6b38f70 JP |
618 | cFYI(1, "Closing uncompleted readdir with rc %d", |
619 | rc); | |
1da177e4 LT |
620 | /* not much we can do if it fails anyway, ignore rc */ |
621 | rc = 0; | |
ddb4cbfc | 622 | } else |
4477288a | 623 | spin_unlock(&cifs_file_list_lock); |
1da177e4 LT |
624 | ptmp = pCFileStruct->srch_inf.ntwrk_buf_start; |
625 | if (ptmp) { | |
b6b38f70 | 626 | cFYI(1, "closedir free smb buf in srch struct"); |
1da177e4 | 627 | pCFileStruct->srch_inf.ntwrk_buf_start = NULL; |
fb8c4b14 | 628 | if (pCFileStruct->srch_inf.smallBuf) |
d47d7c1a SF |
629 | cifs_small_buf_release(ptmp); |
630 | else | |
631 | cifs_buf_release(ptmp); | |
1da177e4 | 632 | } |
13cfb733 | 633 | cifs_put_tlink(pCFileStruct->tlink); |
1da177e4 LT |
634 | kfree(file->private_data); |
635 | file->private_data = NULL; | |
636 | } | |
637 | /* BB can we lock the filestruct while this is going on? */ | |
638 | FreeXid(xid); | |
639 | return rc; | |
640 | } | |
641 | ||
d59dad2b | 642 | static int store_file_lock(struct cifsInodeInfo *cinode, __u64 len, |
03776f45 | 643 | __u64 offset, __u8 type, __u16 netfid) |
7ee1af76 | 644 | { |
fb8c4b14 SF |
645 | struct cifsLockInfo *li = |
646 | kmalloc(sizeof(struct cifsLockInfo), GFP_KERNEL); | |
7ee1af76 JA |
647 | if (li == NULL) |
648 | return -ENOMEM; | |
d59dad2b | 649 | li->netfid = netfid; |
7ee1af76 JA |
650 | li->offset = offset; |
651 | li->length = len; | |
03776f45 PS |
652 | li->type = type; |
653 | li->pid = current->tgid; | |
d59dad2b PS |
654 | mutex_lock(&cinode->lock_mutex); |
655 | list_add_tail(&li->llist, &cinode->llist); | |
656 | mutex_unlock(&cinode->lock_mutex); | |
7ee1af76 JA |
657 | return 0; |
658 | } | |
659 | ||
03776f45 PS |
660 | static void |
661 | cifs_read_flock(struct file_lock *flock, __u8 *type, int *lock, int *unlock, | |
662 | bool *wait_flag) | |
1da177e4 | 663 | { |
03776f45 | 664 | if (flock->fl_flags & FL_POSIX) |
b6b38f70 | 665 | cFYI(1, "Posix"); |
03776f45 | 666 | if (flock->fl_flags & FL_FLOCK) |
b6b38f70 | 667 | cFYI(1, "Flock"); |
03776f45 | 668 | if (flock->fl_flags & FL_SLEEP) { |
b6b38f70 | 669 | cFYI(1, "Blocking lock"); |
03776f45 | 670 | *wait_flag = true; |
1da177e4 | 671 | } |
03776f45 | 672 | if (flock->fl_flags & FL_ACCESS) |
b6b38f70 | 673 | cFYI(1, "Process suspended by mandatory locking - " |
03776f45 PS |
674 | "not implemented yet"); |
675 | if (flock->fl_flags & FL_LEASE) | |
b6b38f70 | 676 | cFYI(1, "Lease on file - not implemented yet"); |
03776f45 | 677 | if (flock->fl_flags & |
1da177e4 | 678 | (~(FL_POSIX | FL_FLOCK | FL_SLEEP | FL_ACCESS | FL_LEASE))) |
03776f45 | 679 | cFYI(1, "Unknown lock flags 0x%x", flock->fl_flags); |
1da177e4 | 680 | |
03776f45 PS |
681 | *type = LOCKING_ANDX_LARGE_FILES; |
682 | if (flock->fl_type == F_WRLCK) { | |
b6b38f70 | 683 | cFYI(1, "F_WRLCK "); |
03776f45 PS |
684 | *lock = 1; |
685 | } else if (flock->fl_type == F_UNLCK) { | |
b6b38f70 | 686 | cFYI(1, "F_UNLCK"); |
03776f45 PS |
687 | *unlock = 1; |
688 | /* Check if unlock includes more than one lock range */ | |
689 | } else if (flock->fl_type == F_RDLCK) { | |
b6b38f70 | 690 | cFYI(1, "F_RDLCK"); |
03776f45 PS |
691 | *type |= LOCKING_ANDX_SHARED_LOCK; |
692 | *lock = 1; | |
693 | } else if (flock->fl_type == F_EXLCK) { | |
b6b38f70 | 694 | cFYI(1, "F_EXLCK"); |
03776f45 PS |
695 | *lock = 1; |
696 | } else if (flock->fl_type == F_SHLCK) { | |
b6b38f70 | 697 | cFYI(1, "F_SHLCK"); |
03776f45 PS |
698 | *type |= LOCKING_ANDX_SHARED_LOCK; |
699 | *lock = 1; | |
1da177e4 | 700 | } else |
b6b38f70 | 701 | cFYI(1, "Unknown type of lock"); |
03776f45 | 702 | } |
1da177e4 | 703 | |
03776f45 PS |
704 | static int |
705 | cifs_getlk(struct cifsFileInfo *cfile, struct file_lock *flock, __u8 type, | |
706 | bool wait_flag, bool posix_lck, int xid) | |
707 | { | |
708 | int rc = 0; | |
709 | __u64 length = 1 + flock->fl_end - flock->fl_start; | |
710 | __u16 netfid = cfile->netfid; | |
711 | struct cifs_tcon *tcon = tlink_tcon(cfile->tlink); | |
f05337c6 | 712 | |
03776f45 PS |
713 | if (posix_lck) { |
714 | int posix_lock_type; | |
715 | if (type & LOCKING_ANDX_SHARED_LOCK) | |
716 | posix_lock_type = CIFS_RDLCK; | |
717 | else | |
718 | posix_lock_type = CIFS_WRLCK; | |
719 | rc = CIFSSMBPosixLock(xid, tcon, netfid, 1 /* get */, | |
720 | length, flock, posix_lock_type, | |
721 | wait_flag); | |
722 | return rc; | |
723 | } | |
1da177e4 | 724 | |
03776f45 PS |
725 | /* BB we could chain these into one lock request BB */ |
726 | rc = CIFSSMBLock(xid, tcon, netfid, current->tgid, length, | |
727 | flock->fl_start, 0, 1, type, 0, 0); | |
728 | if (rc == 0) { | |
729 | rc = CIFSSMBLock(xid, tcon, netfid, current->tgid, | |
730 | length, flock->fl_start, 1, 0, | |
731 | type, 0, 0); | |
732 | flock->fl_type = F_UNLCK; | |
733 | if (rc != 0) | |
734 | cERROR(1, "Error unlocking previously locked " | |
735 | "range %d during test of lock", rc); | |
736 | rc = 0; | |
1da177e4 LT |
737 | return rc; |
738 | } | |
7ee1af76 | 739 | |
03776f45 PS |
740 | if (type & LOCKING_ANDX_SHARED_LOCK) { |
741 | flock->fl_type = F_WRLCK; | |
742 | rc = 0; | |
743 | return rc; | |
7ee1af76 JA |
744 | } |
745 | ||
03776f45 PS |
746 | rc = CIFSSMBLock(xid, tcon, netfid, current->tgid, length, |
747 | flock->fl_start, 0, 1, | |
748 | type | LOCKING_ANDX_SHARED_LOCK, 0, 0); | |
749 | if (rc == 0) { | |
750 | rc = CIFSSMBLock(xid, tcon, netfid, current->tgid, | |
751 | length, flock->fl_start, 1, 0, | |
752 | type | LOCKING_ANDX_SHARED_LOCK, | |
753 | 0, 0); | |
754 | flock->fl_type = F_RDLCK; | |
755 | if (rc != 0) | |
756 | cERROR(1, "Error unlocking previously locked " | |
757 | "range %d during test of lock", rc); | |
758 | } else | |
759 | flock->fl_type = F_WRLCK; | |
760 | ||
761 | rc = 0; | |
762 | return rc; | |
763 | } | |
764 | ||
765 | static int | |
766 | cifs_setlk(struct file *file, struct file_lock *flock, __u8 type, | |
767 | bool wait_flag, bool posix_lck, int lock, int unlock, int xid) | |
768 | { | |
769 | int rc = 0; | |
770 | __u64 length = 1 + flock->fl_end - flock->fl_start; | |
771 | struct cifsFileInfo *cfile = (struct cifsFileInfo *)file->private_data; | |
772 | struct cifs_tcon *tcon = tlink_tcon(cfile->tlink); | |
d59dad2b | 773 | struct cifsInodeInfo *cinode = CIFS_I(file->f_path.dentry->d_inode); |
03776f45 PS |
774 | __u16 netfid = cfile->netfid; |
775 | ||
776 | if (posix_lck) { | |
08547b03 | 777 | int posix_lock_type; |
03776f45 | 778 | if (type & LOCKING_ANDX_SHARED_LOCK) |
08547b03 SF |
779 | posix_lock_type = CIFS_RDLCK; |
780 | else | |
781 | posix_lock_type = CIFS_WRLCK; | |
50c2f753 | 782 | |
03776f45 | 783 | if (unlock == 1) |
beb84dc8 | 784 | posix_lock_type = CIFS_UNLCK; |
7ee1af76 | 785 | |
03776f45 PS |
786 | rc = CIFSSMBPosixLock(xid, tcon, netfid, 0 /* set */, length, |
787 | flock, posix_lock_type, wait_flag); | |
788 | goto out; | |
789 | } | |
7ee1af76 | 790 | |
03776f45 PS |
791 | if (lock) { |
792 | rc = CIFSSMBLock(xid, tcon, netfid, current->tgid, length, | |
793 | flock->fl_start, 0, lock, type, wait_flag, 0); | |
794 | if (rc == 0) { | |
795 | /* For Windows locks we must store them. */ | |
d59dad2b | 796 | rc = store_file_lock(cinode, length, flock->fl_start, |
03776f45 PS |
797 | type, netfid); |
798 | } | |
799 | } else if (unlock) { | |
800 | /* | |
801 | * For each stored lock that this unlock overlaps completely, | |
802 | * unlock it. | |
803 | */ | |
804 | int stored_rc = 0; | |
805 | struct cifsLockInfo *li, *tmp; | |
806 | ||
d59dad2b PS |
807 | mutex_lock(&cinode->lock_mutex); |
808 | list_for_each_entry_safe(li, tmp, &cinode->llist, llist) { | |
03776f45 PS |
809 | if (flock->fl_start > li->offset || |
810 | (flock->fl_start + length) < | |
811 | (li->offset + li->length)) | |
812 | continue; | |
813 | if (current->tgid != li->pid) | |
814 | continue; | |
d59dad2b PS |
815 | if (cfile->netfid != li->netfid) |
816 | continue; | |
03776f45 PS |
817 | |
818 | stored_rc = CIFSSMBLock(xid, tcon, netfid, | |
819 | current->tgid, li->length, | |
820 | li->offset, 1, 0, li->type, | |
821 | 0, 0); | |
822 | if (stored_rc) | |
823 | rc = stored_rc; | |
824 | else { | |
825 | list_del(&li->llist); | |
826 | kfree(li); | |
7ee1af76 | 827 | } |
7ee1af76 | 828 | } |
d59dad2b | 829 | mutex_unlock(&cinode->lock_mutex); |
03776f45 PS |
830 | } |
831 | out: | |
832 | if (flock->fl_flags & FL_POSIX) | |
833 | posix_lock_file_wait(file, flock); | |
834 | return rc; | |
835 | } | |
836 | ||
837 | int cifs_lock(struct file *file, int cmd, struct file_lock *flock) | |
838 | { | |
839 | int rc, xid; | |
840 | int lock = 0, unlock = 0; | |
841 | bool wait_flag = false; | |
842 | bool posix_lck = false; | |
843 | struct cifs_sb_info *cifs_sb; | |
844 | struct cifs_tcon *tcon; | |
845 | struct cifsInodeInfo *cinode; | |
846 | struct cifsFileInfo *cfile; | |
847 | __u16 netfid; | |
848 | __u8 type; | |
849 | ||
850 | rc = -EACCES; | |
851 | xid = GetXid(); | |
852 | ||
853 | cFYI(1, "Lock parm: 0x%x flockflags: 0x%x flocktype: 0x%x start: %lld " | |
854 | "end: %lld", cmd, flock->fl_flags, flock->fl_type, | |
855 | flock->fl_start, flock->fl_end); | |
856 | ||
857 | cifs_read_flock(flock, &type, &lock, &unlock, &wait_flag); | |
858 | ||
859 | cifs_sb = CIFS_SB(file->f_path.dentry->d_sb); | |
860 | cfile = (struct cifsFileInfo *)file->private_data; | |
861 | tcon = tlink_tcon(cfile->tlink); | |
862 | netfid = cfile->netfid; | |
863 | cinode = CIFS_I(file->f_path.dentry->d_inode); | |
864 | ||
865 | if ((tcon->ses->capabilities & CAP_UNIX) && | |
866 | (CIFS_UNIX_FCNTL_CAP & le64_to_cpu(tcon->fsUnixInfo.Capability)) && | |
867 | ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NOPOSIXBRL) == 0)) | |
868 | posix_lck = true; | |
869 | /* | |
870 | * BB add code here to normalize offset and length to account for | |
871 | * negative length which we can not accept over the wire. | |
872 | */ | |
873 | if (IS_GETLK(cmd)) { | |
874 | rc = cifs_getlk(cfile, flock, type, wait_flag, posix_lck, xid); | |
875 | FreeXid(xid); | |
876 | return rc; | |
877 | } | |
878 | ||
879 | if (!lock && !unlock) { | |
880 | /* | |
881 | * if no lock or unlock then nothing to do since we do not | |
882 | * know what it is | |
883 | */ | |
884 | FreeXid(xid); | |
885 | return -EOPNOTSUPP; | |
7ee1af76 JA |
886 | } |
887 | ||
03776f45 PS |
888 | rc = cifs_setlk(file, flock, type, wait_flag, posix_lck, lock, unlock, |
889 | xid); | |
1da177e4 LT |
890 | FreeXid(xid); |
891 | return rc; | |
892 | } | |
893 | ||
fbec9ab9 | 894 | /* update the file size (if needed) after a write */ |
72432ffc | 895 | void |
fbec9ab9 JL |
896 | cifs_update_eof(struct cifsInodeInfo *cifsi, loff_t offset, |
897 | unsigned int bytes_written) | |
898 | { | |
899 | loff_t end_of_write = offset + bytes_written; | |
900 | ||
901 | if (end_of_write > cifsi->server_eof) | |
902 | cifsi->server_eof = end_of_write; | |
903 | } | |
904 | ||
fa2989f4 | 905 | static ssize_t cifs_write(struct cifsFileInfo *open_file, __u32 pid, |
7da4b49a JL |
906 | const char *write_data, size_t write_size, |
907 | loff_t *poffset) | |
1da177e4 LT |
908 | { |
909 | int rc = 0; | |
910 | unsigned int bytes_written = 0; | |
911 | unsigned int total_written; | |
912 | struct cifs_sb_info *cifs_sb; | |
96daf2b0 | 913 | struct cifs_tcon *pTcon; |
7749981e | 914 | int xid; |
7da4b49a JL |
915 | struct dentry *dentry = open_file->dentry; |
916 | struct cifsInodeInfo *cifsi = CIFS_I(dentry->d_inode); | |
fa2989f4 | 917 | struct cifs_io_parms io_parms; |
1da177e4 | 918 | |
7da4b49a | 919 | cifs_sb = CIFS_SB(dentry->d_sb); |
1da177e4 | 920 | |
b6b38f70 | 921 | cFYI(1, "write %zd bytes to offset %lld of %s", write_size, |
7da4b49a | 922 | *poffset, dentry->d_name.name); |
1da177e4 | 923 | |
13cfb733 | 924 | pTcon = tlink_tcon(open_file->tlink); |
50c2f753 | 925 | |
1da177e4 | 926 | xid = GetXid(); |
1da177e4 | 927 | |
1da177e4 LT |
928 | for (total_written = 0; write_size > total_written; |
929 | total_written += bytes_written) { | |
930 | rc = -EAGAIN; | |
931 | while (rc == -EAGAIN) { | |
ca83ce3d JL |
932 | struct kvec iov[2]; |
933 | unsigned int len; | |
934 | ||
1da177e4 | 935 | if (open_file->invalidHandle) { |
1da177e4 LT |
936 | /* we could deadlock if we called |
937 | filemap_fdatawait from here so tell | |
fb8c4b14 | 938 | reopen_file not to flush data to |
1da177e4 | 939 | server now */ |
15886177 | 940 | rc = cifs_reopen_file(open_file, false); |
1da177e4 LT |
941 | if (rc != 0) |
942 | break; | |
943 | } | |
ca83ce3d JL |
944 | |
945 | len = min((size_t)cifs_sb->wsize, | |
946 | write_size - total_written); | |
947 | /* iov[0] is reserved for smb header */ | |
948 | iov[1].iov_base = (char *)write_data + total_written; | |
949 | iov[1].iov_len = len; | |
fa2989f4 PS |
950 | io_parms.netfid = open_file->netfid; |
951 | io_parms.pid = pid; | |
952 | io_parms.tcon = pTcon; | |
953 | io_parms.offset = *poffset; | |
954 | io_parms.length = len; | |
955 | rc = CIFSSMBWrite2(xid, &io_parms, &bytes_written, iov, | |
956 | 1, 0); | |
1da177e4 LT |
957 | } |
958 | if (rc || (bytes_written == 0)) { | |
959 | if (total_written) | |
960 | break; | |
961 | else { | |
962 | FreeXid(xid); | |
963 | return rc; | |
964 | } | |
fbec9ab9 JL |
965 | } else { |
966 | cifs_update_eof(cifsi, *poffset, bytes_written); | |
1da177e4 | 967 | *poffset += bytes_written; |
fbec9ab9 | 968 | } |
1da177e4 LT |
969 | } |
970 | ||
a4544347 | 971 | cifs_stats_bytes_written(pTcon, total_written); |
1da177e4 | 972 | |
7da4b49a JL |
973 | if (total_written > 0) { |
974 | spin_lock(&dentry->d_inode->i_lock); | |
975 | if (*poffset > dentry->d_inode->i_size) | |
976 | i_size_write(dentry->d_inode, *poffset); | |
977 | spin_unlock(&dentry->d_inode->i_lock); | |
1da177e4 | 978 | } |
7da4b49a | 979 | mark_inode_dirty_sync(dentry->d_inode); |
1da177e4 LT |
980 | FreeXid(xid); |
981 | return total_written; | |
982 | } | |
983 | ||
6508d904 JL |
984 | struct cifsFileInfo *find_readable_file(struct cifsInodeInfo *cifs_inode, |
985 | bool fsuid_only) | |
630f3f0c SF |
986 | { |
987 | struct cifsFileInfo *open_file = NULL; | |
6508d904 JL |
988 | struct cifs_sb_info *cifs_sb = CIFS_SB(cifs_inode->vfs_inode.i_sb); |
989 | ||
990 | /* only filter by fsuid on multiuser mounts */ | |
991 | if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MULTIUSER)) | |
992 | fsuid_only = false; | |
630f3f0c | 993 | |
4477288a | 994 | spin_lock(&cifs_file_list_lock); |
630f3f0c SF |
995 | /* we could simply get the first_list_entry since write-only entries |
996 | are always at the end of the list but since the first entry might | |
997 | have a close pending, we go through the whole list */ | |
998 | list_for_each_entry(open_file, &cifs_inode->openFileList, flist) { | |
6508d904 JL |
999 | if (fsuid_only && open_file->uid != current_fsuid()) |
1000 | continue; | |
2e396b83 | 1001 | if (OPEN_FMODE(open_file->f_flags) & FMODE_READ) { |
630f3f0c SF |
1002 | if (!open_file->invalidHandle) { |
1003 | /* found a good file */ | |
1004 | /* lock it so it will not be closed on us */ | |
6ab409b5 | 1005 | cifsFileInfo_get(open_file); |
4477288a | 1006 | spin_unlock(&cifs_file_list_lock); |
630f3f0c SF |
1007 | return open_file; |
1008 | } /* else might as well continue, and look for | |
1009 | another, or simply have the caller reopen it | |
1010 | again rather than trying to fix this handle */ | |
1011 | } else /* write only file */ | |
1012 | break; /* write only files are last so must be done */ | |
1013 | } | |
4477288a | 1014 | spin_unlock(&cifs_file_list_lock); |
630f3f0c SF |
1015 | return NULL; |
1016 | } | |
630f3f0c | 1017 | |
6508d904 JL |
1018 | struct cifsFileInfo *find_writable_file(struct cifsInodeInfo *cifs_inode, |
1019 | bool fsuid_only) | |
6148a742 SF |
1020 | { |
1021 | struct cifsFileInfo *open_file; | |
d3892294 | 1022 | struct cifs_sb_info *cifs_sb; |
2846d386 | 1023 | bool any_available = false; |
dd99cd80 | 1024 | int rc; |
6148a742 | 1025 | |
60808233 SF |
1026 | /* Having a null inode here (because mapping->host was set to zero by |
1027 | the VFS or MM) should not happen but we had reports of on oops (due to | |
1028 | it being zero) during stress testcases so we need to check for it */ | |
1029 | ||
fb8c4b14 | 1030 | if (cifs_inode == NULL) { |
b6b38f70 | 1031 | cERROR(1, "Null inode passed to cifs_writeable_file"); |
60808233 SF |
1032 | dump_stack(); |
1033 | return NULL; | |
1034 | } | |
1035 | ||
d3892294 JL |
1036 | cifs_sb = CIFS_SB(cifs_inode->vfs_inode.i_sb); |
1037 | ||
6508d904 JL |
1038 | /* only filter by fsuid on multiuser mounts */ |
1039 | if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MULTIUSER)) | |
1040 | fsuid_only = false; | |
1041 | ||
4477288a | 1042 | spin_lock(&cifs_file_list_lock); |
9b22b0b7 | 1043 | refind_writable: |
6148a742 | 1044 | list_for_each_entry(open_file, &cifs_inode->openFileList, flist) { |
6508d904 JL |
1045 | if (!any_available && open_file->pid != current->tgid) |
1046 | continue; | |
1047 | if (fsuid_only && open_file->uid != current_fsuid()) | |
6148a742 | 1048 | continue; |
2e396b83 | 1049 | if (OPEN_FMODE(open_file->f_flags) & FMODE_WRITE) { |
6ab409b5 | 1050 | cifsFileInfo_get(open_file); |
9b22b0b7 SF |
1051 | |
1052 | if (!open_file->invalidHandle) { | |
1053 | /* found a good writable file */ | |
4477288a | 1054 | spin_unlock(&cifs_file_list_lock); |
9b22b0b7 SF |
1055 | return open_file; |
1056 | } | |
8840dee9 | 1057 | |
4477288a | 1058 | spin_unlock(&cifs_file_list_lock); |
cdff08e7 | 1059 | |
9b22b0b7 | 1060 | /* Had to unlock since following call can block */ |
15886177 | 1061 | rc = cifs_reopen_file(open_file, false); |
cdff08e7 SF |
1062 | if (!rc) |
1063 | return open_file; | |
9b22b0b7 | 1064 | |
cdff08e7 | 1065 | /* if it fails, try another handle if possible */ |
b6b38f70 | 1066 | cFYI(1, "wp failed on reopen file"); |
6ab409b5 | 1067 | cifsFileInfo_put(open_file); |
8840dee9 | 1068 | |
cdff08e7 SF |
1069 | spin_lock(&cifs_file_list_lock); |
1070 | ||
9b22b0b7 SF |
1071 | /* else we simply continue to the next entry. Thus |
1072 | we do not loop on reopen errors. If we | |
1073 | can not reopen the file, for example if we | |
1074 | reconnected to a server with another client | |
1075 | racing to delete or lock the file we would not | |
1076 | make progress if we restarted before the beginning | |
1077 | of the loop here. */ | |
6148a742 SF |
1078 | } |
1079 | } | |
2846d386 JL |
1080 | /* couldn't find useable FH with same pid, try any available */ |
1081 | if (!any_available) { | |
1082 | any_available = true; | |
1083 | goto refind_writable; | |
1084 | } | |
4477288a | 1085 | spin_unlock(&cifs_file_list_lock); |
6148a742 SF |
1086 | return NULL; |
1087 | } | |
1088 | ||
1da177e4 LT |
1089 | static int cifs_partialpagewrite(struct page *page, unsigned from, unsigned to) |
1090 | { | |
1091 | struct address_space *mapping = page->mapping; | |
1092 | loff_t offset = (loff_t)page->index << PAGE_CACHE_SHIFT; | |
1093 | char *write_data; | |
1094 | int rc = -EFAULT; | |
1095 | int bytes_written = 0; | |
1da177e4 | 1096 | struct inode *inode; |
6148a742 | 1097 | struct cifsFileInfo *open_file; |
1da177e4 LT |
1098 | |
1099 | if (!mapping || !mapping->host) | |
1100 | return -EFAULT; | |
1101 | ||
1102 | inode = page->mapping->host; | |
1da177e4 LT |
1103 | |
1104 | offset += (loff_t)from; | |
1105 | write_data = kmap(page); | |
1106 | write_data += from; | |
1107 | ||
1108 | if ((to > PAGE_CACHE_SIZE) || (from > to)) { | |
1109 | kunmap(page); | |
1110 | return -EIO; | |
1111 | } | |
1112 | ||
1113 | /* racing with truncate? */ | |
1114 | if (offset > mapping->host->i_size) { | |
1115 | kunmap(page); | |
1116 | return 0; /* don't care */ | |
1117 | } | |
1118 | ||
1119 | /* check to make sure that we are not extending the file */ | |
1120 | if (mapping->host->i_size - offset < (loff_t)to) | |
fb8c4b14 | 1121 | to = (unsigned)(mapping->host->i_size - offset); |
1da177e4 | 1122 | |
6508d904 | 1123 | open_file = find_writable_file(CIFS_I(mapping->host), false); |
6148a742 | 1124 | if (open_file) { |
fa2989f4 PS |
1125 | bytes_written = cifs_write(open_file, open_file->pid, |
1126 | write_data, to - from, &offset); | |
6ab409b5 | 1127 | cifsFileInfo_put(open_file); |
1da177e4 | 1128 | /* Does mm or vfs already set times? */ |
6148a742 | 1129 | inode->i_atime = inode->i_mtime = current_fs_time(inode->i_sb); |
bb5a9a04 | 1130 | if ((bytes_written > 0) && (offset)) |
6148a742 | 1131 | rc = 0; |
bb5a9a04 SF |
1132 | else if (bytes_written < 0) |
1133 | rc = bytes_written; | |
6148a742 | 1134 | } else { |
b6b38f70 | 1135 | cFYI(1, "No writeable filehandles for inode"); |
1da177e4 LT |
1136 | rc = -EIO; |
1137 | } | |
1138 | ||
1139 | kunmap(page); | |
1140 | return rc; | |
1141 | } | |
1142 | ||
1da177e4 | 1143 | static int cifs_writepages(struct address_space *mapping, |
37c0eb46 | 1144 | struct writeback_control *wbc) |
1da177e4 | 1145 | { |
c3d17b63 JL |
1146 | struct cifs_sb_info *cifs_sb = CIFS_SB(mapping->host->i_sb); |
1147 | bool done = false, scanned = false, range_whole = false; | |
1148 | pgoff_t end, index; | |
1149 | struct cifs_writedata *wdata; | |
37c0eb46 | 1150 | struct page *page; |
37c0eb46 | 1151 | int rc = 0; |
50c2f753 | 1152 | |
37c0eb46 | 1153 | /* |
c3d17b63 | 1154 | * If wsize is smaller than the page cache size, default to writing |
37c0eb46 SF |
1155 | * one page at a time via cifs_writepage |
1156 | */ | |
1157 | if (cifs_sb->wsize < PAGE_CACHE_SIZE) | |
1158 | return generic_writepages(mapping, wbc); | |
1159 | ||
111ebb6e | 1160 | if (wbc->range_cyclic) { |
37c0eb46 | 1161 | index = mapping->writeback_index; /* Start from prev offset */ |
111ebb6e OH |
1162 | end = -1; |
1163 | } else { | |
1164 | index = wbc->range_start >> PAGE_CACHE_SHIFT; | |
1165 | end = wbc->range_end >> PAGE_CACHE_SHIFT; | |
1166 | if (wbc->range_start == 0 && wbc->range_end == LLONG_MAX) | |
c3d17b63 JL |
1167 | range_whole = true; |
1168 | scanned = true; | |
37c0eb46 SF |
1169 | } |
1170 | retry: | |
c3d17b63 JL |
1171 | while (!done && index <= end) { |
1172 | unsigned int i, nr_pages, found_pages; | |
1173 | pgoff_t next = 0, tofind; | |
1174 | struct page **pages; | |
1175 | ||
1176 | tofind = min((cifs_sb->wsize / PAGE_CACHE_SIZE) - 1, | |
1177 | end - index) + 1; | |
1178 | ||
1179 | wdata = cifs_writedata_alloc((unsigned int)tofind); | |
1180 | if (!wdata) { | |
1181 | rc = -ENOMEM; | |
1182 | break; | |
1183 | } | |
1184 | ||
1185 | /* | |
1186 | * find_get_pages_tag seems to return a max of 256 on each | |
1187 | * iteration, so we must call it several times in order to | |
1188 | * fill the array or the wsize is effectively limited to | |
1189 | * 256 * PAGE_CACHE_SIZE. | |
1190 | */ | |
1191 | found_pages = 0; | |
1192 | pages = wdata->pages; | |
1193 | do { | |
1194 | nr_pages = find_get_pages_tag(mapping, &index, | |
1195 | PAGECACHE_TAG_DIRTY, | |
1196 | tofind, pages); | |
1197 | found_pages += nr_pages; | |
1198 | tofind -= nr_pages; | |
1199 | pages += nr_pages; | |
1200 | } while (nr_pages && tofind && index <= end); | |
1201 | ||
1202 | if (found_pages == 0) { | |
1203 | kref_put(&wdata->refcount, cifs_writedata_release); | |
1204 | break; | |
1205 | } | |
1206 | ||
1207 | nr_pages = 0; | |
1208 | for (i = 0; i < found_pages; i++) { | |
1209 | page = wdata->pages[i]; | |
37c0eb46 SF |
1210 | /* |
1211 | * At this point we hold neither mapping->tree_lock nor | |
1212 | * lock on the page itself: the page may be truncated or | |
1213 | * invalidated (changing page->mapping to NULL), or even | |
1214 | * swizzled back from swapper_space to tmpfs file | |
1215 | * mapping | |
1216 | */ | |
1217 | ||
c3d17b63 | 1218 | if (nr_pages == 0) |
37c0eb46 | 1219 | lock_page(page); |
529ae9aa | 1220 | else if (!trylock_page(page)) |
37c0eb46 SF |
1221 | break; |
1222 | ||
1223 | if (unlikely(page->mapping != mapping)) { | |
1224 | unlock_page(page); | |
1225 | break; | |
1226 | } | |
1227 | ||
111ebb6e | 1228 | if (!wbc->range_cyclic && page->index > end) { |
c3d17b63 | 1229 | done = true; |
37c0eb46 SF |
1230 | unlock_page(page); |
1231 | break; | |
1232 | } | |
1233 | ||
1234 | if (next && (page->index != next)) { | |
1235 | /* Not next consecutive page */ | |
1236 | unlock_page(page); | |
1237 | break; | |
1238 | } | |
1239 | ||
1240 | if (wbc->sync_mode != WB_SYNC_NONE) | |
1241 | wait_on_page_writeback(page); | |
1242 | ||
1243 | if (PageWriteback(page) || | |
cb876f45 | 1244 | !clear_page_dirty_for_io(page)) { |
37c0eb46 SF |
1245 | unlock_page(page); |
1246 | break; | |
1247 | } | |
84d2f07e | 1248 | |
cb876f45 LT |
1249 | /* |
1250 | * This actually clears the dirty bit in the radix tree. | |
1251 | * See cifs_writepage() for more commentary. | |
1252 | */ | |
1253 | set_page_writeback(page); | |
1254 | ||
84d2f07e | 1255 | if (page_offset(page) >= mapping->host->i_size) { |
c3d17b63 | 1256 | done = true; |
84d2f07e | 1257 | unlock_page(page); |
cb876f45 | 1258 | end_page_writeback(page); |
84d2f07e SF |
1259 | break; |
1260 | } | |
1261 | ||
c3d17b63 JL |
1262 | wdata->pages[i] = page; |
1263 | next = page->index + 1; | |
1264 | ++nr_pages; | |
1265 | } | |
37c0eb46 | 1266 | |
c3d17b63 JL |
1267 | /* reset index to refind any pages skipped */ |
1268 | if (nr_pages == 0) | |
1269 | index = wdata->pages[0]->index + 1; | |
84d2f07e | 1270 | |
c3d17b63 JL |
1271 | /* put any pages we aren't going to use */ |
1272 | for (i = nr_pages; i < found_pages; i++) { | |
1273 | page_cache_release(wdata->pages[i]); | |
1274 | wdata->pages[i] = NULL; | |
1275 | } | |
37c0eb46 | 1276 | |
c3d17b63 JL |
1277 | /* nothing to write? */ |
1278 | if (nr_pages == 0) { | |
1279 | kref_put(&wdata->refcount, cifs_writedata_release); | |
1280 | continue; | |
37c0eb46 | 1281 | } |
fbec9ab9 | 1282 | |
c3d17b63 JL |
1283 | wdata->sync_mode = wbc->sync_mode; |
1284 | wdata->nr_pages = nr_pages; | |
1285 | wdata->offset = page_offset(wdata->pages[0]); | |
941b853d | 1286 | |
c3d17b63 JL |
1287 | do { |
1288 | if (wdata->cfile != NULL) | |
1289 | cifsFileInfo_put(wdata->cfile); | |
1290 | wdata->cfile = find_writable_file(CIFS_I(mapping->host), | |
1291 | false); | |
1292 | if (!wdata->cfile) { | |
1293 | cERROR(1, "No writable handles for inode"); | |
1294 | rc = -EBADF; | |
1295 | break; | |
941b853d | 1296 | } |
c3d17b63 JL |
1297 | rc = cifs_async_writev(wdata); |
1298 | } while (wbc->sync_mode == WB_SYNC_ALL && rc == -EAGAIN); | |
941b853d | 1299 | |
c3d17b63 JL |
1300 | for (i = 0; i < nr_pages; ++i) |
1301 | unlock_page(wdata->pages[i]); | |
f3983c21 | 1302 | |
c3d17b63 JL |
1303 | /* send failure -- clean up the mess */ |
1304 | if (rc != 0) { | |
1305 | for (i = 0; i < nr_pages; ++i) { | |
941b853d | 1306 | if (rc == -EAGAIN) |
c3d17b63 JL |
1307 | redirty_page_for_writepage(wbc, |
1308 | wdata->pages[i]); | |
1309 | else | |
1310 | SetPageError(wdata->pages[i]); | |
1311 | end_page_writeback(wdata->pages[i]); | |
1312 | page_cache_release(wdata->pages[i]); | |
37c0eb46 | 1313 | } |
941b853d JL |
1314 | if (rc != -EAGAIN) |
1315 | mapping_set_error(mapping, rc); | |
c3d17b63 JL |
1316 | } |
1317 | kref_put(&wdata->refcount, cifs_writedata_release); | |
941b853d | 1318 | |
c3d17b63 JL |
1319 | wbc->nr_to_write -= nr_pages; |
1320 | if (wbc->nr_to_write <= 0) | |
1321 | done = true; | |
b066a48c | 1322 | |
c3d17b63 | 1323 | index = next; |
37c0eb46 | 1324 | } |
c3d17b63 | 1325 | |
37c0eb46 SF |
1326 | if (!scanned && !done) { |
1327 | /* | |
1328 | * We hit the last page and there is more work to be done: wrap | |
1329 | * back to the start of the file | |
1330 | */ | |
c3d17b63 | 1331 | scanned = true; |
37c0eb46 SF |
1332 | index = 0; |
1333 | goto retry; | |
1334 | } | |
c3d17b63 | 1335 | |
111ebb6e | 1336 | if (wbc->range_cyclic || (range_whole && wbc->nr_to_write > 0)) |
37c0eb46 SF |
1337 | mapping->writeback_index = index; |
1338 | ||
1da177e4 LT |
1339 | return rc; |
1340 | } | |
1da177e4 | 1341 | |
9ad1506b PS |
1342 | static int |
1343 | cifs_writepage_locked(struct page *page, struct writeback_control *wbc) | |
1da177e4 | 1344 | { |
9ad1506b | 1345 | int rc; |
1da177e4 LT |
1346 | int xid; |
1347 | ||
1348 | xid = GetXid(); | |
1349 | /* BB add check for wbc flags */ | |
1350 | page_cache_get(page); | |
ad7a2926 | 1351 | if (!PageUptodate(page)) |
b6b38f70 | 1352 | cFYI(1, "ppw - page not up to date"); |
cb876f45 LT |
1353 | |
1354 | /* | |
1355 | * Set the "writeback" flag, and clear "dirty" in the radix tree. | |
1356 | * | |
1357 | * A writepage() implementation always needs to do either this, | |
1358 | * or re-dirty the page with "redirty_page_for_writepage()" in | |
1359 | * the case of a failure. | |
1360 | * | |
1361 | * Just unlocking the page will cause the radix tree tag-bits | |
1362 | * to fail to update with the state of the page correctly. | |
1363 | */ | |
fb8c4b14 | 1364 | set_page_writeback(page); |
9ad1506b | 1365 | retry_write: |
1da177e4 | 1366 | rc = cifs_partialpagewrite(page, 0, PAGE_CACHE_SIZE); |
9ad1506b PS |
1367 | if (rc == -EAGAIN && wbc->sync_mode == WB_SYNC_ALL) |
1368 | goto retry_write; | |
1369 | else if (rc == -EAGAIN) | |
1370 | redirty_page_for_writepage(wbc, page); | |
1371 | else if (rc != 0) | |
1372 | SetPageError(page); | |
1373 | else | |
1374 | SetPageUptodate(page); | |
cb876f45 LT |
1375 | end_page_writeback(page); |
1376 | page_cache_release(page); | |
1da177e4 LT |
1377 | FreeXid(xid); |
1378 | return rc; | |
1379 | } | |
1380 | ||
9ad1506b PS |
1381 | static int cifs_writepage(struct page *page, struct writeback_control *wbc) |
1382 | { | |
1383 | int rc = cifs_writepage_locked(page, wbc); | |
1384 | unlock_page(page); | |
1385 | return rc; | |
1386 | } | |
1387 | ||
d9414774 NP |
1388 | static int cifs_write_end(struct file *file, struct address_space *mapping, |
1389 | loff_t pos, unsigned len, unsigned copied, | |
1390 | struct page *page, void *fsdata) | |
1da177e4 | 1391 | { |
d9414774 NP |
1392 | int rc; |
1393 | struct inode *inode = mapping->host; | |
d4ffff1f PS |
1394 | struct cifsFileInfo *cfile = file->private_data; |
1395 | struct cifs_sb_info *cifs_sb = CIFS_SB(cfile->dentry->d_sb); | |
1396 | __u32 pid; | |
1397 | ||
1398 | if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_RWPIDFORWARD) | |
1399 | pid = cfile->pid; | |
1400 | else | |
1401 | pid = current->tgid; | |
1da177e4 | 1402 | |
b6b38f70 JP |
1403 | cFYI(1, "write_end for page %p from pos %lld with %d bytes", |
1404 | page, pos, copied); | |
d9414774 | 1405 | |
a98ee8c1 JL |
1406 | if (PageChecked(page)) { |
1407 | if (copied == len) | |
1408 | SetPageUptodate(page); | |
1409 | ClearPageChecked(page); | |
1410 | } else if (!PageUptodate(page) && copied == PAGE_CACHE_SIZE) | |
d9414774 | 1411 | SetPageUptodate(page); |
ad7a2926 | 1412 | |
1da177e4 | 1413 | if (!PageUptodate(page)) { |
d9414774 NP |
1414 | char *page_data; |
1415 | unsigned offset = pos & (PAGE_CACHE_SIZE - 1); | |
1416 | int xid; | |
1417 | ||
1418 | xid = GetXid(); | |
1da177e4 LT |
1419 | /* this is probably better than directly calling |
1420 | partialpage_write since in this function the file handle is | |
1421 | known which we might as well leverage */ | |
1422 | /* BB check if anything else missing out of ppw | |
1423 | such as updating last write time */ | |
1424 | page_data = kmap(page); | |
d4ffff1f | 1425 | rc = cifs_write(cfile, pid, page_data + offset, copied, &pos); |
d9414774 | 1426 | /* if (rc < 0) should we set writebehind rc? */ |
1da177e4 | 1427 | kunmap(page); |
d9414774 NP |
1428 | |
1429 | FreeXid(xid); | |
fb8c4b14 | 1430 | } else { |
d9414774 NP |
1431 | rc = copied; |
1432 | pos += copied; | |
1da177e4 LT |
1433 | set_page_dirty(page); |
1434 | } | |
1435 | ||
d9414774 NP |
1436 | if (rc > 0) { |
1437 | spin_lock(&inode->i_lock); | |
1438 | if (pos > inode->i_size) | |
1439 | i_size_write(inode, pos); | |
1440 | spin_unlock(&inode->i_lock); | |
1441 | } | |
1442 | ||
1443 | unlock_page(page); | |
1444 | page_cache_release(page); | |
1445 | ||
1da177e4 LT |
1446 | return rc; |
1447 | } | |
1448 | ||
02c24a82 JB |
1449 | int cifs_strict_fsync(struct file *file, loff_t start, loff_t end, |
1450 | int datasync) | |
1da177e4 LT |
1451 | { |
1452 | int xid; | |
1453 | int rc = 0; | |
96daf2b0 | 1454 | struct cifs_tcon *tcon; |
c21dfb69 | 1455 | struct cifsFileInfo *smbfile = file->private_data; |
e6a00296 | 1456 | struct inode *inode = file->f_path.dentry->d_inode; |
8be7e6ba | 1457 | struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb); |
1da177e4 | 1458 | |
02c24a82 JB |
1459 | rc = filemap_write_and_wait_range(inode->i_mapping, start, end); |
1460 | if (rc) | |
1461 | return rc; | |
1462 | mutex_lock(&inode->i_mutex); | |
1463 | ||
1da177e4 LT |
1464 | xid = GetXid(); |
1465 | ||
b6b38f70 | 1466 | cFYI(1, "Sync file - name: %s datasync: 0x%x", |
7ea80859 | 1467 | file->f_path.dentry->d_name.name, datasync); |
50c2f753 | 1468 | |
6feb9891 PS |
1469 | if (!CIFS_I(inode)->clientCanCacheRead) { |
1470 | rc = cifs_invalidate_mapping(inode); | |
1471 | if (rc) { | |
1472 | cFYI(1, "rc: %d during invalidate phase", rc); | |
1473 | rc = 0; /* don't care about it in fsync */ | |
1474 | } | |
1475 | } | |
eb4b756b | 1476 | |
8be7e6ba PS |
1477 | tcon = tlink_tcon(smbfile->tlink); |
1478 | if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NOSSYNC)) | |
1479 | rc = CIFSSMBFlush(xid, tcon, smbfile->netfid); | |
1480 | ||
1481 | FreeXid(xid); | |
02c24a82 | 1482 | mutex_unlock(&inode->i_mutex); |
8be7e6ba PS |
1483 | return rc; |
1484 | } | |
1485 | ||
02c24a82 | 1486 | int cifs_fsync(struct file *file, loff_t start, loff_t end, int datasync) |
8be7e6ba PS |
1487 | { |
1488 | int xid; | |
1489 | int rc = 0; | |
96daf2b0 | 1490 | struct cifs_tcon *tcon; |
8be7e6ba PS |
1491 | struct cifsFileInfo *smbfile = file->private_data; |
1492 | struct cifs_sb_info *cifs_sb = CIFS_SB(file->f_path.dentry->d_sb); | |
02c24a82 JB |
1493 | struct inode *inode = file->f_mapping->host; |
1494 | ||
1495 | rc = filemap_write_and_wait_range(inode->i_mapping, start, end); | |
1496 | if (rc) | |
1497 | return rc; | |
1498 | mutex_lock(&inode->i_mutex); | |
8be7e6ba PS |
1499 | |
1500 | xid = GetXid(); | |
1501 | ||
1502 | cFYI(1, "Sync file - name: %s datasync: 0x%x", | |
1503 | file->f_path.dentry->d_name.name, datasync); | |
1504 | ||
1505 | tcon = tlink_tcon(smbfile->tlink); | |
1506 | if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NOSSYNC)) | |
1507 | rc = CIFSSMBFlush(xid, tcon, smbfile->netfid); | |
b298f223 | 1508 | |
1da177e4 | 1509 | FreeXid(xid); |
02c24a82 | 1510 | mutex_unlock(&inode->i_mutex); |
1da177e4 LT |
1511 | return rc; |
1512 | } | |
1513 | ||
1da177e4 LT |
1514 | /* |
1515 | * As file closes, flush all cached write data for this inode checking | |
1516 | * for write behind errors. | |
1517 | */ | |
75e1fcc0 | 1518 | int cifs_flush(struct file *file, fl_owner_t id) |
1da177e4 | 1519 | { |
fb8c4b14 | 1520 | struct inode *inode = file->f_path.dentry->d_inode; |
1da177e4 LT |
1521 | int rc = 0; |
1522 | ||
eb4b756b | 1523 | if (file->f_mode & FMODE_WRITE) |
d3f1322a | 1524 | rc = filemap_write_and_wait(inode->i_mapping); |
50c2f753 | 1525 | |
b6b38f70 | 1526 | cFYI(1, "Flush inode %p file %p rc %d", inode, file, rc); |
1da177e4 LT |
1527 | |
1528 | return rc; | |
1529 | } | |
1530 | ||
72432ffc PS |
1531 | static int |
1532 | cifs_write_allocate_pages(struct page **pages, unsigned long num_pages) | |
1533 | { | |
1534 | int rc = 0; | |
1535 | unsigned long i; | |
1536 | ||
1537 | for (i = 0; i < num_pages; i++) { | |
1538 | pages[i] = alloc_page(__GFP_HIGHMEM); | |
1539 | if (!pages[i]) { | |
1540 | /* | |
1541 | * save number of pages we have already allocated and | |
1542 | * return with ENOMEM error | |
1543 | */ | |
1544 | num_pages = i; | |
1545 | rc = -ENOMEM; | |
1546 | goto error; | |
1547 | } | |
1548 | } | |
1549 | ||
1550 | return rc; | |
1551 | ||
1552 | error: | |
1553 | for (i = 0; i < num_pages; i++) | |
1554 | put_page(pages[i]); | |
1555 | return rc; | |
1556 | } | |
1557 | ||
1558 | static inline | |
1559 | size_t get_numpages(const size_t wsize, const size_t len, size_t *cur_len) | |
1560 | { | |
1561 | size_t num_pages; | |
1562 | size_t clen; | |
1563 | ||
1564 | clen = min_t(const size_t, len, wsize); | |
1565 | num_pages = clen / PAGE_CACHE_SIZE; | |
1566 | if (clen % PAGE_CACHE_SIZE) | |
1567 | num_pages++; | |
1568 | ||
1569 | if (cur_len) | |
1570 | *cur_len = clen; | |
1571 | ||
1572 | return num_pages; | |
1573 | } | |
1574 | ||
1575 | static ssize_t | |
1576 | cifs_iovec_write(struct file *file, const struct iovec *iov, | |
1577 | unsigned long nr_segs, loff_t *poffset) | |
1578 | { | |
76429c14 PS |
1579 | unsigned int written; |
1580 | unsigned long num_pages, npages, i; | |
1581 | size_t copied, len, cur_len; | |
1582 | ssize_t total_written = 0; | |
72432ffc PS |
1583 | struct kvec *to_send; |
1584 | struct page **pages; | |
1585 | struct iov_iter it; | |
1586 | struct inode *inode; | |
1587 | struct cifsFileInfo *open_file; | |
96daf2b0 | 1588 | struct cifs_tcon *pTcon; |
72432ffc | 1589 | struct cifs_sb_info *cifs_sb; |
fa2989f4 | 1590 | struct cifs_io_parms io_parms; |
72432ffc | 1591 | int xid, rc; |
d4ffff1f | 1592 | __u32 pid; |
72432ffc PS |
1593 | |
1594 | len = iov_length(iov, nr_segs); | |
1595 | if (!len) | |
1596 | return 0; | |
1597 | ||
1598 | rc = generic_write_checks(file, poffset, &len, 0); | |
1599 | if (rc) | |
1600 | return rc; | |
1601 | ||
1602 | cifs_sb = CIFS_SB(file->f_path.dentry->d_sb); | |
1603 | num_pages = get_numpages(cifs_sb->wsize, len, &cur_len); | |
1604 | ||
1605 | pages = kmalloc(sizeof(struct pages *)*num_pages, GFP_KERNEL); | |
1606 | if (!pages) | |
1607 | return -ENOMEM; | |
1608 | ||
1609 | to_send = kmalloc(sizeof(struct kvec)*(num_pages + 1), GFP_KERNEL); | |
1610 | if (!to_send) { | |
1611 | kfree(pages); | |
1612 | return -ENOMEM; | |
1613 | } | |
1614 | ||
1615 | rc = cifs_write_allocate_pages(pages, num_pages); | |
1616 | if (rc) { | |
1617 | kfree(pages); | |
1618 | kfree(to_send); | |
1619 | return rc; | |
1620 | } | |
1621 | ||
1622 | xid = GetXid(); | |
1623 | open_file = file->private_data; | |
d4ffff1f PS |
1624 | |
1625 | if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_RWPIDFORWARD) | |
1626 | pid = open_file->pid; | |
1627 | else | |
1628 | pid = current->tgid; | |
1629 | ||
72432ffc PS |
1630 | pTcon = tlink_tcon(open_file->tlink); |
1631 | inode = file->f_path.dentry->d_inode; | |
1632 | ||
1633 | iov_iter_init(&it, iov, nr_segs, len, 0); | |
1634 | npages = num_pages; | |
1635 | ||
1636 | do { | |
1637 | size_t save_len = cur_len; | |
1638 | for (i = 0; i < npages; i++) { | |
1639 | copied = min_t(const size_t, cur_len, PAGE_CACHE_SIZE); | |
1640 | copied = iov_iter_copy_from_user(pages[i], &it, 0, | |
1641 | copied); | |
1642 | cur_len -= copied; | |
1643 | iov_iter_advance(&it, copied); | |
1644 | to_send[i+1].iov_base = kmap(pages[i]); | |
1645 | to_send[i+1].iov_len = copied; | |
1646 | } | |
1647 | ||
1648 | cur_len = save_len - cur_len; | |
1649 | ||
1650 | do { | |
1651 | if (open_file->invalidHandle) { | |
1652 | rc = cifs_reopen_file(open_file, false); | |
1653 | if (rc != 0) | |
1654 | break; | |
1655 | } | |
fa2989f4 | 1656 | io_parms.netfid = open_file->netfid; |
d4ffff1f | 1657 | io_parms.pid = pid; |
fa2989f4 PS |
1658 | io_parms.tcon = pTcon; |
1659 | io_parms.offset = *poffset; | |
1660 | io_parms.length = cur_len; | |
1661 | rc = CIFSSMBWrite2(xid, &io_parms, &written, to_send, | |
1662 | npages, 0); | |
72432ffc PS |
1663 | } while (rc == -EAGAIN); |
1664 | ||
1665 | for (i = 0; i < npages; i++) | |
1666 | kunmap(pages[i]); | |
1667 | ||
1668 | if (written) { | |
1669 | len -= written; | |
1670 | total_written += written; | |
1671 | cifs_update_eof(CIFS_I(inode), *poffset, written); | |
1672 | *poffset += written; | |
1673 | } else if (rc < 0) { | |
1674 | if (!total_written) | |
1675 | total_written = rc; | |
1676 | break; | |
1677 | } | |
1678 | ||
1679 | /* get length and number of kvecs of the next write */ | |
1680 | npages = get_numpages(cifs_sb->wsize, len, &cur_len); | |
1681 | } while (len > 0); | |
1682 | ||
1683 | if (total_written > 0) { | |
1684 | spin_lock(&inode->i_lock); | |
1685 | if (*poffset > inode->i_size) | |
1686 | i_size_write(inode, *poffset); | |
1687 | spin_unlock(&inode->i_lock); | |
1688 | } | |
1689 | ||
1690 | cifs_stats_bytes_written(pTcon, total_written); | |
1691 | mark_inode_dirty_sync(inode); | |
1692 | ||
1693 | for (i = 0; i < num_pages; i++) | |
1694 | put_page(pages[i]); | |
1695 | kfree(to_send); | |
1696 | kfree(pages); | |
1697 | FreeXid(xid); | |
1698 | return total_written; | |
1699 | } | |
1700 | ||
0b81c1c4 | 1701 | ssize_t cifs_user_writev(struct kiocb *iocb, const struct iovec *iov, |
72432ffc PS |
1702 | unsigned long nr_segs, loff_t pos) |
1703 | { | |
1704 | ssize_t written; | |
1705 | struct inode *inode; | |
1706 | ||
1707 | inode = iocb->ki_filp->f_path.dentry->d_inode; | |
1708 | ||
1709 | /* | |
1710 | * BB - optimize the way when signing is disabled. We can drop this | |
1711 | * extra memory-to-memory copying and use iovec buffers for constructing | |
1712 | * write request. | |
1713 | */ | |
1714 | ||
1715 | written = cifs_iovec_write(iocb->ki_filp, iov, nr_segs, &pos); | |
1716 | if (written > 0) { | |
1717 | CIFS_I(inode)->invalid_mapping = true; | |
1718 | iocb->ki_pos = pos; | |
1719 | } | |
1720 | ||
1721 | return written; | |
1722 | } | |
1723 | ||
1724 | ssize_t cifs_strict_writev(struct kiocb *iocb, const struct iovec *iov, | |
1725 | unsigned long nr_segs, loff_t pos) | |
1726 | { | |
1727 | struct inode *inode; | |
1728 | ||
1729 | inode = iocb->ki_filp->f_path.dentry->d_inode; | |
1730 | ||
1731 | if (CIFS_I(inode)->clientCanCacheAll) | |
1732 | return generic_file_aio_write(iocb, iov, nr_segs, pos); | |
1733 | ||
1734 | /* | |
1735 | * In strict cache mode we need to write the data to the server exactly | |
1736 | * from the pos to pos+len-1 rather than flush all affected pages | |
1737 | * because it may cause a error with mandatory locks on these pages but | |
1738 | * not on the region from pos to ppos+len-1. | |
1739 | */ | |
1740 | ||
1741 | return cifs_user_writev(iocb, iov, nr_segs, pos); | |
1742 | } | |
1743 | ||
a70307ee PS |
1744 | static ssize_t |
1745 | cifs_iovec_read(struct file *file, const struct iovec *iov, | |
1746 | unsigned long nr_segs, loff_t *poffset) | |
1da177e4 | 1747 | { |
a70307ee PS |
1748 | int rc; |
1749 | int xid; | |
76429c14 PS |
1750 | ssize_t total_read; |
1751 | unsigned int bytes_read = 0; | |
a70307ee PS |
1752 | size_t len, cur_len; |
1753 | int iov_offset = 0; | |
1da177e4 | 1754 | struct cifs_sb_info *cifs_sb; |
96daf2b0 | 1755 | struct cifs_tcon *pTcon; |
1da177e4 | 1756 | struct cifsFileInfo *open_file; |
1da177e4 | 1757 | struct smb_com_read_rsp *pSMBr; |
d4ffff1f | 1758 | struct cifs_io_parms io_parms; |
a70307ee | 1759 | char *read_data; |
d4ffff1f | 1760 | __u32 pid; |
a70307ee PS |
1761 | |
1762 | if (!nr_segs) | |
1763 | return 0; | |
1764 | ||
1765 | len = iov_length(iov, nr_segs); | |
1766 | if (!len) | |
1767 | return 0; | |
1da177e4 LT |
1768 | |
1769 | xid = GetXid(); | |
e6a00296 | 1770 | cifs_sb = CIFS_SB(file->f_path.dentry->d_sb); |
1da177e4 | 1771 | |
c21dfb69 | 1772 | open_file = file->private_data; |
13cfb733 | 1773 | pTcon = tlink_tcon(open_file->tlink); |
1da177e4 | 1774 | |
d4ffff1f PS |
1775 | if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_RWPIDFORWARD) |
1776 | pid = open_file->pid; | |
1777 | else | |
1778 | pid = current->tgid; | |
1779 | ||
ad7a2926 | 1780 | if ((file->f_flags & O_ACCMODE) == O_WRONLY) |
b6b38f70 | 1781 | cFYI(1, "attempting read on write only file instance"); |
ad7a2926 | 1782 | |
a70307ee PS |
1783 | for (total_read = 0; total_read < len; total_read += bytes_read) { |
1784 | cur_len = min_t(const size_t, len - total_read, cifs_sb->rsize); | |
1da177e4 | 1785 | rc = -EAGAIN; |
a70307ee PS |
1786 | read_data = NULL; |
1787 | ||
1da177e4 | 1788 | while (rc == -EAGAIN) { |
ec637e3f | 1789 | int buf_type = CIFS_NO_BUFFER; |
cdff08e7 | 1790 | if (open_file->invalidHandle) { |
15886177 | 1791 | rc = cifs_reopen_file(open_file, true); |
1da177e4 LT |
1792 | if (rc != 0) |
1793 | break; | |
1794 | } | |
d4ffff1f PS |
1795 | io_parms.netfid = open_file->netfid; |
1796 | io_parms.pid = pid; | |
1797 | io_parms.tcon = pTcon; | |
1798 | io_parms.offset = *poffset; | |
2cebaa58 | 1799 | io_parms.length = cur_len; |
d4ffff1f | 1800 | rc = CIFSSMBRead(xid, &io_parms, &bytes_read, |
a70307ee PS |
1801 | &read_data, &buf_type); |
1802 | pSMBr = (struct smb_com_read_rsp *)read_data; | |
1803 | if (read_data) { | |
1804 | char *data_offset = read_data + 4 + | |
1805 | le16_to_cpu(pSMBr->DataOffset); | |
1806 | if (memcpy_toiovecend(iov, data_offset, | |
1807 | iov_offset, bytes_read)) | |
93544cc6 | 1808 | rc = -EFAULT; |
fb8c4b14 | 1809 | if (buf_type == CIFS_SMALL_BUFFER) |
a70307ee | 1810 | cifs_small_buf_release(read_data); |
fb8c4b14 | 1811 | else if (buf_type == CIFS_LARGE_BUFFER) |
a70307ee PS |
1812 | cifs_buf_release(read_data); |
1813 | read_data = NULL; | |
1814 | iov_offset += bytes_read; | |
1da177e4 LT |
1815 | } |
1816 | } | |
a70307ee | 1817 | |
1da177e4 LT |
1818 | if (rc || (bytes_read == 0)) { |
1819 | if (total_read) { | |
1820 | break; | |
1821 | } else { | |
1822 | FreeXid(xid); | |
1823 | return rc; | |
1824 | } | |
1825 | } else { | |
a4544347 | 1826 | cifs_stats_bytes_read(pTcon, bytes_read); |
1da177e4 LT |
1827 | *poffset += bytes_read; |
1828 | } | |
1829 | } | |
a70307ee | 1830 | |
1da177e4 LT |
1831 | FreeXid(xid); |
1832 | return total_read; | |
1833 | } | |
1834 | ||
0b81c1c4 | 1835 | ssize_t cifs_user_readv(struct kiocb *iocb, const struct iovec *iov, |
a70307ee PS |
1836 | unsigned long nr_segs, loff_t pos) |
1837 | { | |
1838 | ssize_t read; | |
1839 | ||
1840 | read = cifs_iovec_read(iocb->ki_filp, iov, nr_segs, &pos); | |
1841 | if (read > 0) | |
1842 | iocb->ki_pos = pos; | |
1843 | ||
1844 | return read; | |
1845 | } | |
1846 | ||
1847 | ssize_t cifs_strict_readv(struct kiocb *iocb, const struct iovec *iov, | |
1848 | unsigned long nr_segs, loff_t pos) | |
1849 | { | |
1850 | struct inode *inode; | |
1851 | ||
1852 | inode = iocb->ki_filp->f_path.dentry->d_inode; | |
1853 | ||
1854 | if (CIFS_I(inode)->clientCanCacheRead) | |
1855 | return generic_file_aio_read(iocb, iov, nr_segs, pos); | |
1856 | ||
1857 | /* | |
1858 | * In strict cache mode we need to read from the server all the time | |
1859 | * if we don't have level II oplock because the server can delay mtime | |
1860 | * change - so we can't make a decision about inode invalidating. | |
1861 | * And we can also fail with pagereading if there are mandatory locks | |
1862 | * on pages affected by this read but not on the region from pos to | |
1863 | * pos+len-1. | |
1864 | */ | |
1865 | ||
1866 | return cifs_user_readv(iocb, iov, nr_segs, pos); | |
1867 | } | |
1da177e4 LT |
1868 | |
1869 | static ssize_t cifs_read(struct file *file, char *read_data, size_t read_size, | |
a70307ee | 1870 | loff_t *poffset) |
1da177e4 LT |
1871 | { |
1872 | int rc = -EACCES; | |
1873 | unsigned int bytes_read = 0; | |
1874 | unsigned int total_read; | |
1875 | unsigned int current_read_size; | |
1876 | struct cifs_sb_info *cifs_sb; | |
96daf2b0 | 1877 | struct cifs_tcon *pTcon; |
1da177e4 LT |
1878 | int xid; |
1879 | char *current_offset; | |
1880 | struct cifsFileInfo *open_file; | |
d4ffff1f | 1881 | struct cifs_io_parms io_parms; |
ec637e3f | 1882 | int buf_type = CIFS_NO_BUFFER; |
d4ffff1f | 1883 | __u32 pid; |
1da177e4 LT |
1884 | |
1885 | xid = GetXid(); | |
e6a00296 | 1886 | cifs_sb = CIFS_SB(file->f_path.dentry->d_sb); |
1da177e4 LT |
1887 | |
1888 | if (file->private_data == NULL) { | |
0f3bc09e | 1889 | rc = -EBADF; |
1da177e4 | 1890 | FreeXid(xid); |
0f3bc09e | 1891 | return rc; |
1da177e4 | 1892 | } |
c21dfb69 | 1893 | open_file = file->private_data; |
13cfb733 | 1894 | pTcon = tlink_tcon(open_file->tlink); |
1da177e4 | 1895 | |
d4ffff1f PS |
1896 | if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_RWPIDFORWARD) |
1897 | pid = open_file->pid; | |
1898 | else | |
1899 | pid = current->tgid; | |
1900 | ||
1da177e4 | 1901 | if ((file->f_flags & O_ACCMODE) == O_WRONLY) |
b6b38f70 | 1902 | cFYI(1, "attempting read on write only file instance"); |
1da177e4 | 1903 | |
fb8c4b14 | 1904 | for (total_read = 0, current_offset = read_data; |
1da177e4 LT |
1905 | read_size > total_read; |
1906 | total_read += bytes_read, current_offset += bytes_read) { | |
7748dd6e | 1907 | current_read_size = min_t(uint, read_size - total_read, |
1da177e4 | 1908 | cifs_sb->rsize); |
f9f5c817 SF |
1909 | /* For windows me and 9x we do not want to request more |
1910 | than it negotiated since it will refuse the read then */ | |
fb8c4b14 | 1911 | if ((pTcon->ses) && |
f9f5c817 | 1912 | !(pTcon->ses->capabilities & CAP_LARGE_FILES)) { |
7748dd6e | 1913 | current_read_size = min_t(uint, current_read_size, |
c974befa | 1914 | CIFSMaxBufSize); |
f9f5c817 | 1915 | } |
1da177e4 LT |
1916 | rc = -EAGAIN; |
1917 | while (rc == -EAGAIN) { | |
cdff08e7 | 1918 | if (open_file->invalidHandle) { |
15886177 | 1919 | rc = cifs_reopen_file(open_file, true); |
1da177e4 LT |
1920 | if (rc != 0) |
1921 | break; | |
1922 | } | |
d4ffff1f PS |
1923 | io_parms.netfid = open_file->netfid; |
1924 | io_parms.pid = pid; | |
1925 | io_parms.tcon = pTcon; | |
1926 | io_parms.offset = *poffset; | |
1927 | io_parms.length = current_read_size; | |
1928 | rc = CIFSSMBRead(xid, &io_parms, &bytes_read, | |
1929 | ¤t_offset, &buf_type); | |
1da177e4 LT |
1930 | } |
1931 | if (rc || (bytes_read == 0)) { | |
1932 | if (total_read) { | |
1933 | break; | |
1934 | } else { | |
1935 | FreeXid(xid); | |
1936 | return rc; | |
1937 | } | |
1938 | } else { | |
a4544347 | 1939 | cifs_stats_bytes_read(pTcon, total_read); |
1da177e4 LT |
1940 | *poffset += bytes_read; |
1941 | } | |
1942 | } | |
1943 | FreeXid(xid); | |
1944 | return total_read; | |
1945 | } | |
1946 | ||
ca83ce3d JL |
1947 | /* |
1948 | * If the page is mmap'ed into a process' page tables, then we need to make | |
1949 | * sure that it doesn't change while being written back. | |
1950 | */ | |
1951 | static int | |
1952 | cifs_page_mkwrite(struct vm_area_struct *vma, struct vm_fault *vmf) | |
1953 | { | |
1954 | struct page *page = vmf->page; | |
1955 | ||
1956 | lock_page(page); | |
1957 | return VM_FAULT_LOCKED; | |
1958 | } | |
1959 | ||
1960 | static struct vm_operations_struct cifs_file_vm_ops = { | |
1961 | .fault = filemap_fault, | |
1962 | .page_mkwrite = cifs_page_mkwrite, | |
1963 | }; | |
1964 | ||
7a6a19b1 PS |
1965 | int cifs_file_strict_mmap(struct file *file, struct vm_area_struct *vma) |
1966 | { | |
1967 | int rc, xid; | |
1968 | struct inode *inode = file->f_path.dentry->d_inode; | |
1969 | ||
1970 | xid = GetXid(); | |
1971 | ||
6feb9891 PS |
1972 | if (!CIFS_I(inode)->clientCanCacheRead) { |
1973 | rc = cifs_invalidate_mapping(inode); | |
1974 | if (rc) | |
1975 | return rc; | |
1976 | } | |
7a6a19b1 PS |
1977 | |
1978 | rc = generic_file_mmap(file, vma); | |
ca83ce3d JL |
1979 | if (rc == 0) |
1980 | vma->vm_ops = &cifs_file_vm_ops; | |
7a6a19b1 PS |
1981 | FreeXid(xid); |
1982 | return rc; | |
1983 | } | |
1984 | ||
1da177e4 LT |
1985 | int cifs_file_mmap(struct file *file, struct vm_area_struct *vma) |
1986 | { | |
1da177e4 LT |
1987 | int rc, xid; |
1988 | ||
1989 | xid = GetXid(); | |
abab095d | 1990 | rc = cifs_revalidate_file(file); |
1da177e4 | 1991 | if (rc) { |
b6b38f70 | 1992 | cFYI(1, "Validation prior to mmap failed, error=%d", rc); |
1da177e4 LT |
1993 | FreeXid(xid); |
1994 | return rc; | |
1995 | } | |
1996 | rc = generic_file_mmap(file, vma); | |
ca83ce3d JL |
1997 | if (rc == 0) |
1998 | vma->vm_ops = &cifs_file_vm_ops; | |
1da177e4 LT |
1999 | FreeXid(xid); |
2000 | return rc; | |
2001 | } | |
2002 | ||
2003 | ||
fb8c4b14 | 2004 | static void cifs_copy_cache_pages(struct address_space *mapping, |
315e995c | 2005 | struct list_head *pages, int bytes_read, char *data) |
1da177e4 LT |
2006 | { |
2007 | struct page *page; | |
2008 | char *target; | |
2009 | ||
2010 | while (bytes_read > 0) { | |
2011 | if (list_empty(pages)) | |
2012 | break; | |
2013 | ||
2014 | page = list_entry(pages->prev, struct page, lru); | |
2015 | list_del(&page->lru); | |
2016 | ||
315e995c | 2017 | if (add_to_page_cache_lru(page, mapping, page->index, |
1da177e4 LT |
2018 | GFP_KERNEL)) { |
2019 | page_cache_release(page); | |
b6b38f70 | 2020 | cFYI(1, "Add page cache failed"); |
3079ca62 SF |
2021 | data += PAGE_CACHE_SIZE; |
2022 | bytes_read -= PAGE_CACHE_SIZE; | |
1da177e4 LT |
2023 | continue; |
2024 | } | |
06b43672 | 2025 | page_cache_release(page); |
1da177e4 | 2026 | |
fb8c4b14 | 2027 | target = kmap_atomic(page, KM_USER0); |
1da177e4 LT |
2028 | |
2029 | if (PAGE_CACHE_SIZE > bytes_read) { | |
2030 | memcpy(target, data, bytes_read); | |
2031 | /* zero the tail end of this partial page */ | |
fb8c4b14 | 2032 | memset(target + bytes_read, 0, |
1da177e4 LT |
2033 | PAGE_CACHE_SIZE - bytes_read); |
2034 | bytes_read = 0; | |
2035 | } else { | |
2036 | memcpy(target, data, PAGE_CACHE_SIZE); | |
2037 | bytes_read -= PAGE_CACHE_SIZE; | |
2038 | } | |
2039 | kunmap_atomic(target, KM_USER0); | |
2040 | ||
2041 | flush_dcache_page(page); | |
2042 | SetPageUptodate(page); | |
2043 | unlock_page(page); | |
1da177e4 | 2044 | data += PAGE_CACHE_SIZE; |
9dc06558 SJ |
2045 | |
2046 | /* add page to FS-Cache */ | |
2047 | cifs_readpage_to_fscache(mapping->host, page); | |
1da177e4 LT |
2048 | } |
2049 | return; | |
2050 | } | |
2051 | ||
2052 | static int cifs_readpages(struct file *file, struct address_space *mapping, | |
2053 | struct list_head *page_list, unsigned num_pages) | |
2054 | { | |
2055 | int rc = -EACCES; | |
2056 | int xid; | |
2057 | loff_t offset; | |
2058 | struct page *page; | |
2059 | struct cifs_sb_info *cifs_sb; | |
96daf2b0 | 2060 | struct cifs_tcon *pTcon; |
2c2130e1 | 2061 | unsigned int bytes_read = 0; |
fb8c4b14 | 2062 | unsigned int read_size, i; |
1da177e4 LT |
2063 | char *smb_read_data = NULL; |
2064 | struct smb_com_read_rsp *pSMBr; | |
1da177e4 | 2065 | struct cifsFileInfo *open_file; |
d4ffff1f | 2066 | struct cifs_io_parms io_parms; |
ec637e3f | 2067 | int buf_type = CIFS_NO_BUFFER; |
d4ffff1f | 2068 | __u32 pid; |
1da177e4 LT |
2069 | |
2070 | xid = GetXid(); | |
2071 | if (file->private_data == NULL) { | |
0f3bc09e | 2072 | rc = -EBADF; |
1da177e4 | 2073 | FreeXid(xid); |
0f3bc09e | 2074 | return rc; |
1da177e4 | 2075 | } |
c21dfb69 | 2076 | open_file = file->private_data; |
e6a00296 | 2077 | cifs_sb = CIFS_SB(file->f_path.dentry->d_sb); |
13cfb733 | 2078 | pTcon = tlink_tcon(open_file->tlink); |
bfa0d75a | 2079 | |
56698236 SJ |
2080 | /* |
2081 | * Reads as many pages as possible from fscache. Returns -ENOBUFS | |
2082 | * immediately if the cookie is negative | |
2083 | */ | |
2084 | rc = cifs_readpages_from_fscache(mapping->host, mapping, page_list, | |
2085 | &num_pages); | |
2086 | if (rc == 0) | |
2087 | goto read_complete; | |
2088 | ||
f19159dc | 2089 | cFYI(DBG2, "rpages: num pages %d", num_pages); |
d4ffff1f PS |
2090 | if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_RWPIDFORWARD) |
2091 | pid = open_file->pid; | |
2092 | else | |
2093 | pid = current->tgid; | |
2094 | ||
1da177e4 LT |
2095 | for (i = 0; i < num_pages; ) { |
2096 | unsigned contig_pages; | |
2097 | struct page *tmp_page; | |
2098 | unsigned long expected_index; | |
2099 | ||
2100 | if (list_empty(page_list)) | |
2101 | break; | |
2102 | ||
2103 | page = list_entry(page_list->prev, struct page, lru); | |
2104 | offset = (loff_t)page->index << PAGE_CACHE_SHIFT; | |
2105 | ||
2106 | /* count adjacent pages that we will read into */ | |
2107 | contig_pages = 0; | |
fb8c4b14 | 2108 | expected_index = |
1da177e4 | 2109 | list_entry(page_list->prev, struct page, lru)->index; |
fb8c4b14 | 2110 | list_for_each_entry_reverse(tmp_page, page_list, lru) { |
1da177e4 LT |
2111 | if (tmp_page->index == expected_index) { |
2112 | contig_pages++; | |
2113 | expected_index++; | |
2114 | } else | |
fb8c4b14 | 2115 | break; |
1da177e4 LT |
2116 | } |
2117 | if (contig_pages + i > num_pages) | |
2118 | contig_pages = num_pages - i; | |
2119 | ||
2120 | /* for reads over a certain size could initiate async | |
2121 | read ahead */ | |
2122 | ||
2123 | read_size = contig_pages * PAGE_CACHE_SIZE; | |
2124 | /* Read size needs to be in multiples of one page */ | |
2125 | read_size = min_t(const unsigned int, read_size, | |
2126 | cifs_sb->rsize & PAGE_CACHE_MASK); | |
b6b38f70 JP |
2127 | cFYI(DBG2, "rpages: read size 0x%x contiguous pages %d", |
2128 | read_size, contig_pages); | |
1da177e4 LT |
2129 | rc = -EAGAIN; |
2130 | while (rc == -EAGAIN) { | |
cdff08e7 | 2131 | if (open_file->invalidHandle) { |
15886177 | 2132 | rc = cifs_reopen_file(open_file, true); |
1da177e4 LT |
2133 | if (rc != 0) |
2134 | break; | |
2135 | } | |
d4ffff1f PS |
2136 | io_parms.netfid = open_file->netfid; |
2137 | io_parms.pid = pid; | |
2138 | io_parms.tcon = pTcon; | |
2139 | io_parms.offset = offset; | |
2140 | io_parms.length = read_size; | |
2141 | rc = CIFSSMBRead(xid, &io_parms, &bytes_read, | |
2142 | &smb_read_data, &buf_type); | |
a9d02ad4 | 2143 | /* BB more RC checks ? */ |
fb8c4b14 | 2144 | if (rc == -EAGAIN) { |
1da177e4 | 2145 | if (smb_read_data) { |
fb8c4b14 | 2146 | if (buf_type == CIFS_SMALL_BUFFER) |
ec637e3f | 2147 | cifs_small_buf_release(smb_read_data); |
fb8c4b14 | 2148 | else if (buf_type == CIFS_LARGE_BUFFER) |
ec637e3f | 2149 | cifs_buf_release(smb_read_data); |
1da177e4 LT |
2150 | smb_read_data = NULL; |
2151 | } | |
2152 | } | |
2153 | } | |
2154 | if ((rc < 0) || (smb_read_data == NULL)) { | |
b6b38f70 | 2155 | cFYI(1, "Read error in readpages: %d", rc); |
1da177e4 LT |
2156 | break; |
2157 | } else if (bytes_read > 0) { | |
6f88cc2e | 2158 | task_io_account_read(bytes_read); |
1da177e4 LT |
2159 | pSMBr = (struct smb_com_read_rsp *)smb_read_data; |
2160 | cifs_copy_cache_pages(mapping, page_list, bytes_read, | |
2161 | smb_read_data + 4 /* RFC1001 hdr */ + | |
315e995c | 2162 | le16_to_cpu(pSMBr->DataOffset)); |
1da177e4 LT |
2163 | |
2164 | i += bytes_read >> PAGE_CACHE_SHIFT; | |
a4544347 | 2165 | cifs_stats_bytes_read(pTcon, bytes_read); |
2c2130e1 | 2166 | if ((bytes_read & PAGE_CACHE_MASK) != bytes_read) { |
1da177e4 LT |
2167 | i++; /* account for partial page */ |
2168 | ||
fb8c4b14 | 2169 | /* server copy of file can have smaller size |
1da177e4 | 2170 | than client */ |
fb8c4b14 SF |
2171 | /* BB do we need to verify this common case ? |
2172 | this case is ok - if we are at server EOF | |
1da177e4 LT |
2173 | we will hit it on next read */ |
2174 | ||
05ac9d4b | 2175 | /* break; */ |
1da177e4 LT |
2176 | } |
2177 | } else { | |
b6b38f70 | 2178 | cFYI(1, "No bytes read (%d) at offset %lld . " |
f19159dc | 2179 | "Cleaning remaining pages from readahead list", |
b6b38f70 | 2180 | bytes_read, offset); |
fb8c4b14 | 2181 | /* BB turn off caching and do new lookup on |
1da177e4 | 2182 | file size at server? */ |
1da177e4 LT |
2183 | break; |
2184 | } | |
2185 | if (smb_read_data) { | |
fb8c4b14 | 2186 | if (buf_type == CIFS_SMALL_BUFFER) |
ec637e3f | 2187 | cifs_small_buf_release(smb_read_data); |
fb8c4b14 | 2188 | else if (buf_type == CIFS_LARGE_BUFFER) |
ec637e3f | 2189 | cifs_buf_release(smb_read_data); |
1da177e4 LT |
2190 | smb_read_data = NULL; |
2191 | } | |
2192 | bytes_read = 0; | |
2193 | } | |
2194 | ||
1da177e4 LT |
2195 | /* need to free smb_read_data buf before exit */ |
2196 | if (smb_read_data) { | |
fb8c4b14 | 2197 | if (buf_type == CIFS_SMALL_BUFFER) |
47c886b3 | 2198 | cifs_small_buf_release(smb_read_data); |
fb8c4b14 | 2199 | else if (buf_type == CIFS_LARGE_BUFFER) |
47c886b3 | 2200 | cifs_buf_release(smb_read_data); |
1da177e4 | 2201 | smb_read_data = NULL; |
fb8c4b14 | 2202 | } |
1da177e4 | 2203 | |
56698236 | 2204 | read_complete: |
1da177e4 LT |
2205 | FreeXid(xid); |
2206 | return rc; | |
2207 | } | |
2208 | ||
2209 | static int cifs_readpage_worker(struct file *file, struct page *page, | |
2210 | loff_t *poffset) | |
2211 | { | |
2212 | char *read_data; | |
2213 | int rc; | |
2214 | ||
56698236 SJ |
2215 | /* Is the page cached? */ |
2216 | rc = cifs_readpage_from_fscache(file->f_path.dentry->d_inode, page); | |
2217 | if (rc == 0) | |
2218 | goto read_complete; | |
2219 | ||
1da177e4 LT |
2220 | page_cache_get(page); |
2221 | read_data = kmap(page); | |
2222 | /* for reads over a certain size could initiate async read ahead */ | |
fb8c4b14 | 2223 | |
1da177e4 | 2224 | rc = cifs_read(file, read_data, PAGE_CACHE_SIZE, poffset); |
fb8c4b14 | 2225 | |
1da177e4 LT |
2226 | if (rc < 0) |
2227 | goto io_error; | |
2228 | else | |
b6b38f70 | 2229 | cFYI(1, "Bytes read %d", rc); |
fb8c4b14 | 2230 | |
e6a00296 JJS |
2231 | file->f_path.dentry->d_inode->i_atime = |
2232 | current_fs_time(file->f_path.dentry->d_inode->i_sb); | |
fb8c4b14 | 2233 | |
1da177e4 LT |
2234 | if (PAGE_CACHE_SIZE > rc) |
2235 | memset(read_data + rc, 0, PAGE_CACHE_SIZE - rc); | |
2236 | ||
2237 | flush_dcache_page(page); | |
2238 | SetPageUptodate(page); | |
9dc06558 SJ |
2239 | |
2240 | /* send this page to the cache */ | |
2241 | cifs_readpage_to_fscache(file->f_path.dentry->d_inode, page); | |
2242 | ||
1da177e4 | 2243 | rc = 0; |
fb8c4b14 | 2244 | |
1da177e4 | 2245 | io_error: |
fb8c4b14 | 2246 | kunmap(page); |
1da177e4 | 2247 | page_cache_release(page); |
56698236 SJ |
2248 | |
2249 | read_complete: | |
1da177e4 LT |
2250 | return rc; |
2251 | } | |
2252 | ||
2253 | static int cifs_readpage(struct file *file, struct page *page) | |
2254 | { | |
2255 | loff_t offset = (loff_t)page->index << PAGE_CACHE_SHIFT; | |
2256 | int rc = -EACCES; | |
2257 | int xid; | |
2258 | ||
2259 | xid = GetXid(); | |
2260 | ||
2261 | if (file->private_data == NULL) { | |
0f3bc09e | 2262 | rc = -EBADF; |
1da177e4 | 2263 | FreeXid(xid); |
0f3bc09e | 2264 | return rc; |
1da177e4 LT |
2265 | } |
2266 | ||
b6b38f70 JP |
2267 | cFYI(1, "readpage %p at offset %d 0x%x\n", |
2268 | page, (int)offset, (int)offset); | |
1da177e4 LT |
2269 | |
2270 | rc = cifs_readpage_worker(file, page, &offset); | |
2271 | ||
2272 | unlock_page(page); | |
2273 | ||
2274 | FreeXid(xid); | |
2275 | return rc; | |
2276 | } | |
2277 | ||
a403a0a3 SF |
2278 | static int is_inode_writable(struct cifsInodeInfo *cifs_inode) |
2279 | { | |
2280 | struct cifsFileInfo *open_file; | |
2281 | ||
4477288a | 2282 | spin_lock(&cifs_file_list_lock); |
a403a0a3 | 2283 | list_for_each_entry(open_file, &cifs_inode->openFileList, flist) { |
2e396b83 | 2284 | if (OPEN_FMODE(open_file->f_flags) & FMODE_WRITE) { |
4477288a | 2285 | spin_unlock(&cifs_file_list_lock); |
a403a0a3 SF |
2286 | return 1; |
2287 | } | |
2288 | } | |
4477288a | 2289 | spin_unlock(&cifs_file_list_lock); |
a403a0a3 SF |
2290 | return 0; |
2291 | } | |
2292 | ||
1da177e4 LT |
2293 | /* We do not want to update the file size from server for inodes |
2294 | open for write - to avoid races with writepage extending | |
2295 | the file - in the future we could consider allowing | |
fb8c4b14 | 2296 | refreshing the inode only on increases in the file size |
1da177e4 LT |
2297 | but this is tricky to do without racing with writebehind |
2298 | page caching in the current Linux kernel design */ | |
4b18f2a9 | 2299 | bool is_size_safe_to_change(struct cifsInodeInfo *cifsInode, __u64 end_of_file) |
1da177e4 | 2300 | { |
a403a0a3 | 2301 | if (!cifsInode) |
4b18f2a9 | 2302 | return true; |
50c2f753 | 2303 | |
a403a0a3 SF |
2304 | if (is_inode_writable(cifsInode)) { |
2305 | /* This inode is open for write at least once */ | |
c32a0b68 SF |
2306 | struct cifs_sb_info *cifs_sb; |
2307 | ||
c32a0b68 | 2308 | cifs_sb = CIFS_SB(cifsInode->vfs_inode.i_sb); |
ad7a2926 | 2309 | if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DIRECT_IO) { |
fb8c4b14 | 2310 | /* since no page cache to corrupt on directio |
c32a0b68 | 2311 | we can change size safely */ |
4b18f2a9 | 2312 | return true; |
c32a0b68 SF |
2313 | } |
2314 | ||
fb8c4b14 | 2315 | if (i_size_read(&cifsInode->vfs_inode) < end_of_file) |
4b18f2a9 | 2316 | return true; |
7ba52631 | 2317 | |
4b18f2a9 | 2318 | return false; |
23e7dd7d | 2319 | } else |
4b18f2a9 | 2320 | return true; |
1da177e4 LT |
2321 | } |
2322 | ||
d9414774 NP |
2323 | static int cifs_write_begin(struct file *file, struct address_space *mapping, |
2324 | loff_t pos, unsigned len, unsigned flags, | |
2325 | struct page **pagep, void **fsdata) | |
1da177e4 | 2326 | { |
d9414774 NP |
2327 | pgoff_t index = pos >> PAGE_CACHE_SHIFT; |
2328 | loff_t offset = pos & (PAGE_CACHE_SIZE - 1); | |
a98ee8c1 JL |
2329 | loff_t page_start = pos & PAGE_MASK; |
2330 | loff_t i_size; | |
2331 | struct page *page; | |
2332 | int rc = 0; | |
d9414774 | 2333 | |
b6b38f70 | 2334 | cFYI(1, "write_begin from %lld len %d", (long long)pos, len); |
d9414774 | 2335 | |
54566b2c | 2336 | page = grab_cache_page_write_begin(mapping, index, flags); |
a98ee8c1 JL |
2337 | if (!page) { |
2338 | rc = -ENOMEM; | |
2339 | goto out; | |
2340 | } | |
8a236264 | 2341 | |
a98ee8c1 JL |
2342 | if (PageUptodate(page)) |
2343 | goto out; | |
8a236264 | 2344 | |
a98ee8c1 JL |
2345 | /* |
2346 | * If we write a full page it will be up to date, no need to read from | |
2347 | * the server. If the write is short, we'll end up doing a sync write | |
2348 | * instead. | |
2349 | */ | |
2350 | if (len == PAGE_CACHE_SIZE) | |
2351 | goto out; | |
8a236264 | 2352 | |
a98ee8c1 JL |
2353 | /* |
2354 | * optimize away the read when we have an oplock, and we're not | |
2355 | * expecting to use any of the data we'd be reading in. That | |
2356 | * is, when the page lies beyond the EOF, or straddles the EOF | |
2357 | * and the write will cover all of the existing data. | |
2358 | */ | |
2359 | if (CIFS_I(mapping->host)->clientCanCacheRead) { | |
2360 | i_size = i_size_read(mapping->host); | |
2361 | if (page_start >= i_size || | |
2362 | (offset == 0 && (pos + len) >= i_size)) { | |
2363 | zero_user_segments(page, 0, offset, | |
2364 | offset + len, | |
2365 | PAGE_CACHE_SIZE); | |
2366 | /* | |
2367 | * PageChecked means that the parts of the page | |
2368 | * to which we're not writing are considered up | |
2369 | * to date. Once the data is copied to the | |
2370 | * page, it can be set uptodate. | |
2371 | */ | |
2372 | SetPageChecked(page); | |
2373 | goto out; | |
2374 | } | |
2375 | } | |
d9414774 | 2376 | |
a98ee8c1 JL |
2377 | if ((file->f_flags & O_ACCMODE) != O_WRONLY) { |
2378 | /* | |
2379 | * might as well read a page, it is fast enough. If we get | |
2380 | * an error, we don't need to return it. cifs_write_end will | |
2381 | * do a sync write instead since PG_uptodate isn't set. | |
2382 | */ | |
2383 | cifs_readpage_worker(file, page, &page_start); | |
8a236264 SF |
2384 | } else { |
2385 | /* we could try using another file handle if there is one - | |
2386 | but how would we lock it to prevent close of that handle | |
2387 | racing with this read? In any case | |
d9414774 | 2388 | this will be written out by write_end so is fine */ |
1da177e4 | 2389 | } |
a98ee8c1 JL |
2390 | out: |
2391 | *pagep = page; | |
2392 | return rc; | |
1da177e4 LT |
2393 | } |
2394 | ||
85f2d6b4 SJ |
2395 | static int cifs_release_page(struct page *page, gfp_t gfp) |
2396 | { | |
2397 | if (PagePrivate(page)) | |
2398 | return 0; | |
2399 | ||
2400 | return cifs_fscache_release_page(page, gfp); | |
2401 | } | |
2402 | ||
2403 | static void cifs_invalidate_page(struct page *page, unsigned long offset) | |
2404 | { | |
2405 | struct cifsInodeInfo *cifsi = CIFS_I(page->mapping->host); | |
2406 | ||
2407 | if (offset == 0) | |
2408 | cifs_fscache_invalidate_page(page, &cifsi->vfs_inode); | |
2409 | } | |
2410 | ||
9ad1506b PS |
2411 | static int cifs_launder_page(struct page *page) |
2412 | { | |
2413 | int rc = 0; | |
2414 | loff_t range_start = page_offset(page); | |
2415 | loff_t range_end = range_start + (loff_t)(PAGE_CACHE_SIZE - 1); | |
2416 | struct writeback_control wbc = { | |
2417 | .sync_mode = WB_SYNC_ALL, | |
2418 | .nr_to_write = 0, | |
2419 | .range_start = range_start, | |
2420 | .range_end = range_end, | |
2421 | }; | |
2422 | ||
2423 | cFYI(1, "Launder page: %p", page); | |
2424 | ||
2425 | if (clear_page_dirty_for_io(page)) | |
2426 | rc = cifs_writepage_locked(page, &wbc); | |
2427 | ||
2428 | cifs_fscache_invalidate_page(page, page->mapping->host); | |
2429 | return rc; | |
2430 | } | |
2431 | ||
9b646972 | 2432 | void cifs_oplock_break(struct work_struct *work) |
3bc303c2 JL |
2433 | { |
2434 | struct cifsFileInfo *cfile = container_of(work, struct cifsFileInfo, | |
2435 | oplock_break); | |
a5e18bc3 | 2436 | struct inode *inode = cfile->dentry->d_inode; |
3bc303c2 | 2437 | struct cifsInodeInfo *cinode = CIFS_I(inode); |
eb4b756b | 2438 | int rc = 0; |
3bc303c2 JL |
2439 | |
2440 | if (inode && S_ISREG(inode->i_mode)) { | |
d54ff732 | 2441 | if (cinode->clientCanCacheRead) |
8737c930 | 2442 | break_lease(inode, O_RDONLY); |
d54ff732 | 2443 | else |
8737c930 | 2444 | break_lease(inode, O_WRONLY); |
3bc303c2 JL |
2445 | rc = filemap_fdatawrite(inode->i_mapping); |
2446 | if (cinode->clientCanCacheRead == 0) { | |
eb4b756b JL |
2447 | rc = filemap_fdatawait(inode->i_mapping); |
2448 | mapping_set_error(inode->i_mapping, rc); | |
3bc303c2 JL |
2449 | invalidate_remote_inode(inode); |
2450 | } | |
b6b38f70 | 2451 | cFYI(1, "Oplock flush inode %p rc %d", inode, rc); |
3bc303c2 JL |
2452 | } |
2453 | ||
2454 | /* | |
2455 | * releasing stale oplock after recent reconnect of smb session using | |
2456 | * a now incorrect file handle is not a data integrity issue but do | |
2457 | * not bother sending an oplock release if session to server still is | |
2458 | * disconnected since oplock already released by the server | |
2459 | */ | |
cdff08e7 | 2460 | if (!cfile->oplock_break_cancelled) { |
03776f45 PS |
2461 | rc = CIFSSMBLock(0, tlink_tcon(cfile->tlink), cfile->netfid, |
2462 | current->tgid, 0, 0, 0, 0, | |
2463 | LOCKING_ANDX_OPLOCK_RELEASE, false, | |
12fed00d | 2464 | cinode->clientCanCacheRead ? 1 : 0); |
b6b38f70 | 2465 | cFYI(1, "Oplock release rc = %d", rc); |
3bc303c2 | 2466 | } |
3bc303c2 JL |
2467 | } |
2468 | ||
f5e54d6e | 2469 | const struct address_space_operations cifs_addr_ops = { |
1da177e4 LT |
2470 | .readpage = cifs_readpage, |
2471 | .readpages = cifs_readpages, | |
2472 | .writepage = cifs_writepage, | |
37c0eb46 | 2473 | .writepages = cifs_writepages, |
d9414774 NP |
2474 | .write_begin = cifs_write_begin, |
2475 | .write_end = cifs_write_end, | |
1da177e4 | 2476 | .set_page_dirty = __set_page_dirty_nobuffers, |
85f2d6b4 SJ |
2477 | .releasepage = cifs_release_page, |
2478 | .invalidatepage = cifs_invalidate_page, | |
9ad1506b | 2479 | .launder_page = cifs_launder_page, |
1da177e4 | 2480 | }; |
273d81d6 DK |
2481 | |
2482 | /* | |
2483 | * cifs_readpages requires the server to support a buffer large enough to | |
2484 | * contain the header plus one complete page of data. Otherwise, we need | |
2485 | * to leave cifs_readpages out of the address space operations. | |
2486 | */ | |
f5e54d6e | 2487 | const struct address_space_operations cifs_addr_ops_smallbuf = { |
273d81d6 DK |
2488 | .readpage = cifs_readpage, |
2489 | .writepage = cifs_writepage, | |
2490 | .writepages = cifs_writepages, | |
d9414774 NP |
2491 | .write_begin = cifs_write_begin, |
2492 | .write_end = cifs_write_end, | |
273d81d6 | 2493 | .set_page_dirty = __set_page_dirty_nobuffers, |
85f2d6b4 SJ |
2494 | .releasepage = cifs_release_page, |
2495 | .invalidatepage = cifs_invalidate_page, | |
9ad1506b | 2496 | .launder_page = cifs_launder_page, |
273d81d6 | 2497 | }; |