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Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * fs/cifs/file.c | |
3 | * | |
4 | * vfs operations that deal with files | |
fb8c4b14 | 5 | * |
f19159dc | 6 | * Copyright (C) International Business Machines Corp., 2002,2010 |
1da177e4 | 7 | * Author(s): Steve French (sfrench@us.ibm.com) |
7ee1af76 | 8 | * Jeremy Allison (jra@samba.org) |
1da177e4 LT |
9 | * |
10 | * This library is free software; you can redistribute it and/or modify | |
11 | * it under the terms of the GNU Lesser General Public License as published | |
12 | * by the Free Software Foundation; either version 2.1 of the License, or | |
13 | * (at your option) any later version. | |
14 | * | |
15 | * This library is distributed in the hope that it will be useful, | |
16 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
17 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See | |
18 | * the GNU Lesser General Public License for more details. | |
19 | * | |
20 | * You should have received a copy of the GNU Lesser General Public License | |
21 | * along with this library; if not, write to the Free Software | |
22 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA | |
23 | */ | |
24 | #include <linux/fs.h> | |
37c0eb46 | 25 | #include <linux/backing-dev.h> |
1da177e4 LT |
26 | #include <linux/stat.h> |
27 | #include <linux/fcntl.h> | |
28 | #include <linux/pagemap.h> | |
29 | #include <linux/pagevec.h> | |
37c0eb46 | 30 | #include <linux/writeback.h> |
6f88cc2e | 31 | #include <linux/task_io_accounting_ops.h> |
23e7dd7d | 32 | #include <linux/delay.h> |
3bc303c2 | 33 | #include <linux/mount.h> |
5a0e3ad6 | 34 | #include <linux/slab.h> |
690c5e31 | 35 | #include <linux/swap.h> |
1da177e4 LT |
36 | #include <asm/div64.h> |
37 | #include "cifsfs.h" | |
38 | #include "cifspdu.h" | |
39 | #include "cifsglob.h" | |
40 | #include "cifsproto.h" | |
41 | #include "cifs_unicode.h" | |
42 | #include "cifs_debug.h" | |
43 | #include "cifs_fs_sb.h" | |
9451a9a5 | 44 | #include "fscache.h" |
1da177e4 | 45 | |
1da177e4 LT |
46 | static inline int cifs_convert_flags(unsigned int flags) |
47 | { | |
48 | if ((flags & O_ACCMODE) == O_RDONLY) | |
49 | return GENERIC_READ; | |
50 | else if ((flags & O_ACCMODE) == O_WRONLY) | |
51 | return GENERIC_WRITE; | |
52 | else if ((flags & O_ACCMODE) == O_RDWR) { | |
53 | /* GENERIC_ALL is too much permission to request | |
54 | can cause unnecessary access denied on create */ | |
55 | /* return GENERIC_ALL; */ | |
56 | return (GENERIC_READ | GENERIC_WRITE); | |
57 | } | |
58 | ||
e10f7b55 JL |
59 | return (READ_CONTROL | FILE_WRITE_ATTRIBUTES | FILE_READ_ATTRIBUTES | |
60 | FILE_WRITE_EA | FILE_APPEND_DATA | FILE_WRITE_DATA | | |
61 | FILE_READ_DATA); | |
7fc8f4e9 | 62 | } |
e10f7b55 | 63 | |
608712fe | 64 | static u32 cifs_posix_convert_flags(unsigned int flags) |
7fc8f4e9 | 65 | { |
608712fe | 66 | u32 posix_flags = 0; |
e10f7b55 | 67 | |
7fc8f4e9 | 68 | if ((flags & O_ACCMODE) == O_RDONLY) |
608712fe | 69 | posix_flags = SMB_O_RDONLY; |
7fc8f4e9 | 70 | else if ((flags & O_ACCMODE) == O_WRONLY) |
608712fe JL |
71 | posix_flags = SMB_O_WRONLY; |
72 | else if ((flags & O_ACCMODE) == O_RDWR) | |
73 | posix_flags = SMB_O_RDWR; | |
74 | ||
75 | if (flags & O_CREAT) | |
76 | posix_flags |= SMB_O_CREAT; | |
77 | if (flags & O_EXCL) | |
78 | posix_flags |= SMB_O_EXCL; | |
79 | if (flags & O_TRUNC) | |
80 | posix_flags |= SMB_O_TRUNC; | |
81 | /* be safe and imply O_SYNC for O_DSYNC */ | |
6b2f3d1f | 82 | if (flags & O_DSYNC) |
608712fe | 83 | posix_flags |= SMB_O_SYNC; |
7fc8f4e9 | 84 | if (flags & O_DIRECTORY) |
608712fe | 85 | posix_flags |= SMB_O_DIRECTORY; |
7fc8f4e9 | 86 | if (flags & O_NOFOLLOW) |
608712fe | 87 | posix_flags |= SMB_O_NOFOLLOW; |
7fc8f4e9 | 88 | if (flags & O_DIRECT) |
608712fe | 89 | posix_flags |= SMB_O_DIRECT; |
7fc8f4e9 SF |
90 | |
91 | return posix_flags; | |
1da177e4 LT |
92 | } |
93 | ||
94 | static inline int cifs_get_disposition(unsigned int flags) | |
95 | { | |
96 | if ((flags & (O_CREAT | O_EXCL)) == (O_CREAT | O_EXCL)) | |
97 | return FILE_CREATE; | |
98 | else if ((flags & (O_CREAT | O_TRUNC)) == (O_CREAT | O_TRUNC)) | |
99 | return FILE_OVERWRITE_IF; | |
100 | else if ((flags & O_CREAT) == O_CREAT) | |
101 | return FILE_OPEN_IF; | |
55aa2e09 SF |
102 | else if ((flags & O_TRUNC) == O_TRUNC) |
103 | return FILE_OVERWRITE; | |
1da177e4 LT |
104 | else |
105 | return FILE_OPEN; | |
106 | } | |
107 | ||
608712fe JL |
108 | int cifs_posix_open(char *full_path, struct inode **pinode, |
109 | struct super_block *sb, int mode, unsigned int f_flags, | |
110 | __u32 *poplock, __u16 *pnetfid, int xid) | |
111 | { | |
112 | int rc; | |
113 | FILE_UNIX_BASIC_INFO *presp_data; | |
114 | __u32 posix_flags = 0; | |
115 | struct cifs_sb_info *cifs_sb = CIFS_SB(sb); | |
116 | struct cifs_fattr fattr; | |
117 | struct tcon_link *tlink; | |
96daf2b0 | 118 | struct cifs_tcon *tcon; |
608712fe JL |
119 | |
120 | cFYI(1, "posix open %s", full_path); | |
121 | ||
122 | presp_data = kzalloc(sizeof(FILE_UNIX_BASIC_INFO), GFP_KERNEL); | |
123 | if (presp_data == NULL) | |
124 | return -ENOMEM; | |
125 | ||
126 | tlink = cifs_sb_tlink(cifs_sb); | |
127 | if (IS_ERR(tlink)) { | |
128 | rc = PTR_ERR(tlink); | |
129 | goto posix_open_ret; | |
130 | } | |
131 | ||
132 | tcon = tlink_tcon(tlink); | |
133 | mode &= ~current_umask(); | |
134 | ||
135 | posix_flags = cifs_posix_convert_flags(f_flags); | |
136 | rc = CIFSPOSIXCreate(xid, tcon, posix_flags, mode, pnetfid, presp_data, | |
137 | poplock, full_path, cifs_sb->local_nls, | |
138 | cifs_sb->mnt_cifs_flags & | |
139 | CIFS_MOUNT_MAP_SPECIAL_CHR); | |
140 | cifs_put_tlink(tlink); | |
141 | ||
142 | if (rc) | |
143 | goto posix_open_ret; | |
144 | ||
145 | if (presp_data->Type == cpu_to_le32(-1)) | |
146 | goto posix_open_ret; /* open ok, caller does qpathinfo */ | |
147 | ||
148 | if (!pinode) | |
149 | goto posix_open_ret; /* caller does not need info */ | |
150 | ||
151 | cifs_unix_basic_to_fattr(&fattr, presp_data, cifs_sb); | |
152 | ||
153 | /* get new inode and set it up */ | |
154 | if (*pinode == NULL) { | |
155 | cifs_fill_uniqueid(sb, &fattr); | |
156 | *pinode = cifs_iget(sb, &fattr); | |
157 | if (!*pinode) { | |
158 | rc = -ENOMEM; | |
159 | goto posix_open_ret; | |
160 | } | |
161 | } else { | |
162 | cifs_fattr_to_inode(*pinode, &fattr); | |
163 | } | |
164 | ||
165 | posix_open_ret: | |
166 | kfree(presp_data); | |
167 | return rc; | |
168 | } | |
169 | ||
eeb910a6 PS |
170 | static int |
171 | cifs_nt_open(char *full_path, struct inode *inode, struct cifs_sb_info *cifs_sb, | |
96daf2b0 | 172 | struct cifs_tcon *tcon, unsigned int f_flags, __u32 *poplock, |
eeb910a6 PS |
173 | __u16 *pnetfid, int xid) |
174 | { | |
175 | int rc; | |
176 | int desiredAccess; | |
177 | int disposition; | |
3d3ea8e6 | 178 | int create_options = CREATE_NOT_DIR; |
eeb910a6 PS |
179 | FILE_ALL_INFO *buf; |
180 | ||
181 | desiredAccess = cifs_convert_flags(f_flags); | |
182 | ||
183 | /********************************************************************* | |
184 | * open flag mapping table: | |
185 | * | |
186 | * POSIX Flag CIFS Disposition | |
187 | * ---------- ---------------- | |
188 | * O_CREAT FILE_OPEN_IF | |
189 | * O_CREAT | O_EXCL FILE_CREATE | |
190 | * O_CREAT | O_TRUNC FILE_OVERWRITE_IF | |
191 | * O_TRUNC FILE_OVERWRITE | |
192 | * none of the above FILE_OPEN | |
193 | * | |
194 | * Note that there is not a direct match between disposition | |
195 | * FILE_SUPERSEDE (ie create whether or not file exists although | |
196 | * O_CREAT | O_TRUNC is similar but truncates the existing | |
197 | * file rather than creating a new file as FILE_SUPERSEDE does | |
198 | * (which uses the attributes / metadata passed in on open call) | |
199 | *? | |
200 | *? O_SYNC is a reasonable match to CIFS writethrough flag | |
201 | *? and the read write flags match reasonably. O_LARGEFILE | |
202 | *? is irrelevant because largefile support is always used | |
203 | *? by this client. Flags O_APPEND, O_DIRECT, O_DIRECTORY, | |
204 | * O_FASYNC, O_NOFOLLOW, O_NONBLOCK need further investigation | |
205 | *********************************************************************/ | |
206 | ||
207 | disposition = cifs_get_disposition(f_flags); | |
208 | ||
209 | /* BB pass O_SYNC flag through on file attributes .. BB */ | |
210 | ||
211 | buf = kmalloc(sizeof(FILE_ALL_INFO), GFP_KERNEL); | |
212 | if (!buf) | |
213 | return -ENOMEM; | |
214 | ||
3d3ea8e6 SP |
215 | if (backup_cred(cifs_sb)) |
216 | create_options |= CREATE_OPEN_BACKUP_INTENT; | |
217 | ||
eeb910a6 PS |
218 | if (tcon->ses->capabilities & CAP_NT_SMBS) |
219 | rc = CIFSSMBOpen(xid, tcon, full_path, disposition, | |
3d3ea8e6 | 220 | desiredAccess, create_options, pnetfid, poplock, buf, |
eeb910a6 PS |
221 | cifs_sb->local_nls, cifs_sb->mnt_cifs_flags |
222 | & CIFS_MOUNT_MAP_SPECIAL_CHR); | |
223 | else | |
224 | rc = SMBLegacyOpen(xid, tcon, full_path, disposition, | |
225 | desiredAccess, CREATE_NOT_DIR, pnetfid, poplock, buf, | |
226 | cifs_sb->local_nls, cifs_sb->mnt_cifs_flags | |
227 | & CIFS_MOUNT_MAP_SPECIAL_CHR); | |
228 | ||
229 | if (rc) | |
230 | goto out; | |
231 | ||
232 | if (tcon->unix_ext) | |
233 | rc = cifs_get_inode_info_unix(&inode, full_path, inode->i_sb, | |
234 | xid); | |
235 | else | |
236 | rc = cifs_get_inode_info(&inode, full_path, buf, inode->i_sb, | |
237 | xid, pnetfid); | |
238 | ||
239 | out: | |
240 | kfree(buf); | |
241 | return rc; | |
242 | } | |
243 | ||
15ecb436 JL |
244 | struct cifsFileInfo * |
245 | cifs_new_fileinfo(__u16 fileHandle, struct file *file, | |
246 | struct tcon_link *tlink, __u32 oplock) | |
247 | { | |
248 | struct dentry *dentry = file->f_path.dentry; | |
249 | struct inode *inode = dentry->d_inode; | |
250 | struct cifsInodeInfo *pCifsInode = CIFS_I(inode); | |
251 | struct cifsFileInfo *pCifsFile; | |
252 | ||
253 | pCifsFile = kzalloc(sizeof(struct cifsFileInfo), GFP_KERNEL); | |
254 | if (pCifsFile == NULL) | |
255 | return pCifsFile; | |
256 | ||
5f6dbc9e | 257 | pCifsFile->count = 1; |
15ecb436 JL |
258 | pCifsFile->netfid = fileHandle; |
259 | pCifsFile->pid = current->tgid; | |
260 | pCifsFile->uid = current_fsuid(); | |
261 | pCifsFile->dentry = dget(dentry); | |
262 | pCifsFile->f_flags = file->f_flags; | |
263 | pCifsFile->invalidHandle = false; | |
15ecb436 JL |
264 | pCifsFile->tlink = cifs_get_tlink(tlink); |
265 | mutex_init(&pCifsFile->fh_mutex); | |
15ecb436 JL |
266 | INIT_WORK(&pCifsFile->oplock_break, cifs_oplock_break); |
267 | ||
4477288a | 268 | spin_lock(&cifs_file_list_lock); |
15ecb436 JL |
269 | list_add(&pCifsFile->tlist, &(tlink_tcon(tlink)->openFileList)); |
270 | /* if readable file instance put first in list*/ | |
271 | if (file->f_mode & FMODE_READ) | |
272 | list_add(&pCifsFile->flist, &pCifsInode->openFileList); | |
273 | else | |
274 | list_add_tail(&pCifsFile->flist, &pCifsInode->openFileList); | |
4477288a | 275 | spin_unlock(&cifs_file_list_lock); |
15ecb436 | 276 | |
c6723628 | 277 | cifs_set_oplock_level(pCifsInode, oplock); |
15ecb436 JL |
278 | |
279 | file->private_data = pCifsFile; | |
280 | return pCifsFile; | |
281 | } | |
282 | ||
cdff08e7 SF |
283 | /* |
284 | * Release a reference on the file private data. This may involve closing | |
5f6dbc9e JL |
285 | * the filehandle out on the server. Must be called without holding |
286 | * cifs_file_list_lock. | |
cdff08e7 | 287 | */ |
b33879aa JL |
288 | void cifsFileInfo_put(struct cifsFileInfo *cifs_file) |
289 | { | |
e66673e3 | 290 | struct inode *inode = cifs_file->dentry->d_inode; |
96daf2b0 | 291 | struct cifs_tcon *tcon = tlink_tcon(cifs_file->tlink); |
e66673e3 | 292 | struct cifsInodeInfo *cifsi = CIFS_I(inode); |
4f8ba8a0 | 293 | struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb); |
cdff08e7 SF |
294 | struct cifsLockInfo *li, *tmp; |
295 | ||
296 | spin_lock(&cifs_file_list_lock); | |
5f6dbc9e | 297 | if (--cifs_file->count > 0) { |
cdff08e7 SF |
298 | spin_unlock(&cifs_file_list_lock); |
299 | return; | |
300 | } | |
301 | ||
302 | /* remove it from the lists */ | |
303 | list_del(&cifs_file->flist); | |
304 | list_del(&cifs_file->tlist); | |
305 | ||
306 | if (list_empty(&cifsi->openFileList)) { | |
307 | cFYI(1, "closing last open instance for inode %p", | |
308 | cifs_file->dentry->d_inode); | |
4f8ba8a0 PS |
309 | |
310 | /* in strict cache mode we need invalidate mapping on the last | |
311 | close because it may cause a error when we open this file | |
312 | again and get at least level II oplock */ | |
313 | if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_STRICT_IO) | |
314 | CIFS_I(inode)->invalid_mapping = true; | |
315 | ||
c6723628 | 316 | cifs_set_oplock_level(cifsi, 0); |
cdff08e7 SF |
317 | } |
318 | spin_unlock(&cifs_file_list_lock); | |
319 | ||
ad635942 JL |
320 | cancel_work_sync(&cifs_file->oplock_break); |
321 | ||
cdff08e7 SF |
322 | if (!tcon->need_reconnect && !cifs_file->invalidHandle) { |
323 | int xid, rc; | |
324 | ||
325 | xid = GetXid(); | |
326 | rc = CIFSSMBClose(xid, tcon, cifs_file->netfid); | |
327 | FreeXid(xid); | |
328 | } | |
329 | ||
330 | /* Delete any outstanding lock records. We'll lose them when the file | |
331 | * is closed anyway. | |
332 | */ | |
d59dad2b PS |
333 | mutex_lock(&cifsi->lock_mutex); |
334 | list_for_each_entry_safe(li, tmp, &cifsi->llist, llist) { | |
335 | if (li->netfid != cifs_file->netfid) | |
336 | continue; | |
cdff08e7 SF |
337 | list_del(&li->llist); |
338 | kfree(li); | |
b33879aa | 339 | } |
d59dad2b | 340 | mutex_unlock(&cifsi->lock_mutex); |
cdff08e7 SF |
341 | |
342 | cifs_put_tlink(cifs_file->tlink); | |
343 | dput(cifs_file->dentry); | |
344 | kfree(cifs_file); | |
b33879aa JL |
345 | } |
346 | ||
1da177e4 LT |
347 | int cifs_open(struct inode *inode, struct file *file) |
348 | { | |
349 | int rc = -EACCES; | |
590a3fe0 JL |
350 | int xid; |
351 | __u32 oplock; | |
1da177e4 | 352 | struct cifs_sb_info *cifs_sb; |
96daf2b0 | 353 | struct cifs_tcon *tcon; |
7ffec372 | 354 | struct tcon_link *tlink; |
6ca9f3ba | 355 | struct cifsFileInfo *pCifsFile = NULL; |
1da177e4 | 356 | char *full_path = NULL; |
7e12eddb | 357 | bool posix_open_ok = false; |
1da177e4 | 358 | __u16 netfid; |
1da177e4 LT |
359 | |
360 | xid = GetXid(); | |
361 | ||
362 | cifs_sb = CIFS_SB(inode->i_sb); | |
7ffec372 JL |
363 | tlink = cifs_sb_tlink(cifs_sb); |
364 | if (IS_ERR(tlink)) { | |
365 | FreeXid(xid); | |
366 | return PTR_ERR(tlink); | |
367 | } | |
368 | tcon = tlink_tcon(tlink); | |
1da177e4 | 369 | |
e6a00296 | 370 | full_path = build_path_from_dentry(file->f_path.dentry); |
1da177e4 | 371 | if (full_path == NULL) { |
0f3bc09e | 372 | rc = -ENOMEM; |
232341ba | 373 | goto out; |
1da177e4 LT |
374 | } |
375 | ||
b6b38f70 JP |
376 | cFYI(1, "inode = 0x%p file flags are 0x%x for %s", |
377 | inode, file->f_flags, full_path); | |
276a74a4 | 378 | |
e7504734 | 379 | if (enable_oplocks) |
276a74a4 SF |
380 | oplock = REQ_OPLOCK; |
381 | else | |
382 | oplock = 0; | |
383 | ||
64cc2c63 SF |
384 | if (!tcon->broken_posix_open && tcon->unix_ext && |
385 | (tcon->ses->capabilities & CAP_UNIX) && | |
276a74a4 SF |
386 | (CIFS_UNIX_POSIX_PATH_OPS_CAP & |
387 | le64_to_cpu(tcon->fsUnixInfo.Capability))) { | |
276a74a4 | 388 | /* can not refresh inode info since size could be stale */ |
2422f676 | 389 | rc = cifs_posix_open(full_path, &inode, inode->i_sb, |
fa588e0c | 390 | cifs_sb->mnt_file_mode /* ignored */, |
608712fe | 391 | file->f_flags, &oplock, &netfid, xid); |
276a74a4 | 392 | if (rc == 0) { |
b6b38f70 | 393 | cFYI(1, "posix open succeeded"); |
7e12eddb | 394 | posix_open_ok = true; |
64cc2c63 SF |
395 | } else if ((rc == -EINVAL) || (rc == -EOPNOTSUPP)) { |
396 | if (tcon->ses->serverNOS) | |
b6b38f70 | 397 | cERROR(1, "server %s of type %s returned" |
64cc2c63 SF |
398 | " unexpected error on SMB posix open" |
399 | ", disabling posix open support." | |
400 | " Check if server update available.", | |
401 | tcon->ses->serverName, | |
b6b38f70 | 402 | tcon->ses->serverNOS); |
64cc2c63 | 403 | tcon->broken_posix_open = true; |
276a74a4 SF |
404 | } else if ((rc != -EIO) && (rc != -EREMOTE) && |
405 | (rc != -EOPNOTSUPP)) /* path not found or net err */ | |
406 | goto out; | |
64cc2c63 SF |
407 | /* else fallthrough to retry open the old way on network i/o |
408 | or DFS errors */ | |
276a74a4 SF |
409 | } |
410 | ||
7e12eddb PS |
411 | if (!posix_open_ok) { |
412 | rc = cifs_nt_open(full_path, inode, cifs_sb, tcon, | |
413 | file->f_flags, &oplock, &netfid, xid); | |
414 | if (rc) | |
415 | goto out; | |
416 | } | |
47c78b7f | 417 | |
abfe1eed | 418 | pCifsFile = cifs_new_fileinfo(netfid, file, tlink, oplock); |
6ca9f3ba | 419 | if (pCifsFile == NULL) { |
7e12eddb | 420 | CIFSSMBClose(xid, tcon, netfid); |
1da177e4 LT |
421 | rc = -ENOMEM; |
422 | goto out; | |
423 | } | |
1da177e4 | 424 | |
9451a9a5 SJ |
425 | cifs_fscache_set_inode_cookie(inode, file); |
426 | ||
7e12eddb | 427 | if ((oplock & CIFS_CREATE_ACTION) && !posix_open_ok && tcon->unix_ext) { |
1da177e4 LT |
428 | /* time to set mode which we can not set earlier due to |
429 | problems creating new read-only files */ | |
7e12eddb PS |
430 | struct cifs_unix_set_info_args args = { |
431 | .mode = inode->i_mode, | |
432 | .uid = NO_CHANGE_64, | |
433 | .gid = NO_CHANGE_64, | |
434 | .ctime = NO_CHANGE_64, | |
435 | .atime = NO_CHANGE_64, | |
436 | .mtime = NO_CHANGE_64, | |
437 | .device = 0, | |
438 | }; | |
d44a9fe2 JL |
439 | CIFSSMBUnixSetFileInfo(xid, tcon, &args, netfid, |
440 | pCifsFile->pid); | |
1da177e4 LT |
441 | } |
442 | ||
443 | out: | |
1da177e4 LT |
444 | kfree(full_path); |
445 | FreeXid(xid); | |
7ffec372 | 446 | cifs_put_tlink(tlink); |
1da177e4 LT |
447 | return rc; |
448 | } | |
449 | ||
0418726b | 450 | /* Try to reacquire byte range locks that were released when session */ |
1da177e4 LT |
451 | /* to server was lost */ |
452 | static int cifs_relock_file(struct cifsFileInfo *cifsFile) | |
453 | { | |
454 | int rc = 0; | |
455 | ||
456 | /* BB list all locks open on this file and relock */ | |
457 | ||
458 | return rc; | |
459 | } | |
460 | ||
15886177 | 461 | static int cifs_reopen_file(struct cifsFileInfo *pCifsFile, bool can_flush) |
1da177e4 LT |
462 | { |
463 | int rc = -EACCES; | |
590a3fe0 JL |
464 | int xid; |
465 | __u32 oplock; | |
1da177e4 | 466 | struct cifs_sb_info *cifs_sb; |
96daf2b0 | 467 | struct cifs_tcon *tcon; |
1da177e4 | 468 | struct cifsInodeInfo *pCifsInode; |
fb8c4b14 | 469 | struct inode *inode; |
1da177e4 LT |
470 | char *full_path = NULL; |
471 | int desiredAccess; | |
472 | int disposition = FILE_OPEN; | |
3d3ea8e6 | 473 | int create_options = CREATE_NOT_DIR; |
1da177e4 LT |
474 | __u16 netfid; |
475 | ||
1da177e4 | 476 | xid = GetXid(); |
f0a71eb8 | 477 | mutex_lock(&pCifsFile->fh_mutex); |
4b18f2a9 | 478 | if (!pCifsFile->invalidHandle) { |
f0a71eb8 | 479 | mutex_unlock(&pCifsFile->fh_mutex); |
0f3bc09e | 480 | rc = 0; |
1da177e4 | 481 | FreeXid(xid); |
0f3bc09e | 482 | return rc; |
1da177e4 LT |
483 | } |
484 | ||
15886177 | 485 | inode = pCifsFile->dentry->d_inode; |
1da177e4 | 486 | cifs_sb = CIFS_SB(inode->i_sb); |
13cfb733 | 487 | tcon = tlink_tcon(pCifsFile->tlink); |
3a9f462f | 488 | |
1da177e4 LT |
489 | /* can not grab rename sem here because various ops, including |
490 | those that already have the rename sem can end up causing writepage | |
491 | to get called and if the server was down that means we end up here, | |
492 | and we can never tell if the caller already has the rename_sem */ | |
15886177 | 493 | full_path = build_path_from_dentry(pCifsFile->dentry); |
1da177e4 | 494 | if (full_path == NULL) { |
3a9f462f | 495 | rc = -ENOMEM; |
f0a71eb8 | 496 | mutex_unlock(&pCifsFile->fh_mutex); |
1da177e4 | 497 | FreeXid(xid); |
3a9f462f | 498 | return rc; |
1da177e4 LT |
499 | } |
500 | ||
b6b38f70 | 501 | cFYI(1, "inode = 0x%p file flags 0x%x for %s", |
15886177 | 502 | inode, pCifsFile->f_flags, full_path); |
1da177e4 | 503 | |
e7504734 | 504 | if (enable_oplocks) |
1da177e4 LT |
505 | oplock = REQ_OPLOCK; |
506 | else | |
4b18f2a9 | 507 | oplock = 0; |
1da177e4 | 508 | |
7fc8f4e9 SF |
509 | if (tcon->unix_ext && (tcon->ses->capabilities & CAP_UNIX) && |
510 | (CIFS_UNIX_POSIX_PATH_OPS_CAP & | |
511 | le64_to_cpu(tcon->fsUnixInfo.Capability))) { | |
608712fe JL |
512 | |
513 | /* | |
514 | * O_CREAT, O_EXCL and O_TRUNC already had their effect on the | |
515 | * original open. Must mask them off for a reopen. | |
516 | */ | |
15886177 JL |
517 | unsigned int oflags = pCifsFile->f_flags & |
518 | ~(O_CREAT | O_EXCL | O_TRUNC); | |
608712fe | 519 | |
2422f676 | 520 | rc = cifs_posix_open(full_path, NULL, inode->i_sb, |
fa588e0c SF |
521 | cifs_sb->mnt_file_mode /* ignored */, |
522 | oflags, &oplock, &netfid, xid); | |
7fc8f4e9 | 523 | if (rc == 0) { |
b6b38f70 | 524 | cFYI(1, "posix reopen succeeded"); |
7fc8f4e9 SF |
525 | goto reopen_success; |
526 | } | |
527 | /* fallthrough to retry open the old way on errors, especially | |
528 | in the reconnect path it is important to retry hard */ | |
529 | } | |
530 | ||
15886177 | 531 | desiredAccess = cifs_convert_flags(pCifsFile->f_flags); |
7fc8f4e9 | 532 | |
3d3ea8e6 SP |
533 | if (backup_cred(cifs_sb)) |
534 | create_options |= CREATE_OPEN_BACKUP_INTENT; | |
535 | ||
1da177e4 | 536 | /* Can not refresh inode by passing in file_info buf to be returned |
fb8c4b14 SF |
537 | by SMBOpen and then calling get_inode_info with returned buf |
538 | since file might have write behind data that needs to be flushed | |
1da177e4 LT |
539 | and server version of file size can be stale. If we knew for sure |
540 | that inode was not dirty locally we could do this */ | |
541 | ||
7fc8f4e9 | 542 | rc = CIFSSMBOpen(xid, tcon, full_path, disposition, desiredAccess, |
3d3ea8e6 | 543 | create_options, &netfid, &oplock, NULL, |
fb8c4b14 | 544 | cifs_sb->local_nls, cifs_sb->mnt_cifs_flags & |
737b758c | 545 | CIFS_MOUNT_MAP_SPECIAL_CHR); |
1da177e4 | 546 | if (rc) { |
f0a71eb8 | 547 | mutex_unlock(&pCifsFile->fh_mutex); |
b6b38f70 JP |
548 | cFYI(1, "cifs_open returned 0x%x", rc); |
549 | cFYI(1, "oplock: %d", oplock); | |
15886177 JL |
550 | goto reopen_error_exit; |
551 | } | |
552 | ||
7fc8f4e9 | 553 | reopen_success: |
15886177 JL |
554 | pCifsFile->netfid = netfid; |
555 | pCifsFile->invalidHandle = false; | |
556 | mutex_unlock(&pCifsFile->fh_mutex); | |
557 | pCifsInode = CIFS_I(inode); | |
558 | ||
559 | if (can_flush) { | |
560 | rc = filemap_write_and_wait(inode->i_mapping); | |
eb4b756b | 561 | mapping_set_error(inode->i_mapping, rc); |
15886177 | 562 | |
15886177 JL |
563 | if (tcon->unix_ext) |
564 | rc = cifs_get_inode_info_unix(&inode, | |
565 | full_path, inode->i_sb, xid); | |
566 | else | |
567 | rc = cifs_get_inode_info(&inode, | |
568 | full_path, NULL, inode->i_sb, | |
569 | xid, NULL); | |
570 | } /* else we are writing out data to server already | |
571 | and could deadlock if we tried to flush data, and | |
572 | since we do not know if we have data that would | |
573 | invalidate the current end of file on the server | |
574 | we can not go to the server to get the new inod | |
575 | info */ | |
e66673e3 | 576 | |
c6723628 | 577 | cifs_set_oplock_level(pCifsInode, oplock); |
e66673e3 | 578 | |
15886177 JL |
579 | cifs_relock_file(pCifsFile); |
580 | ||
581 | reopen_error_exit: | |
1da177e4 LT |
582 | kfree(full_path); |
583 | FreeXid(xid); | |
584 | return rc; | |
585 | } | |
586 | ||
587 | int cifs_close(struct inode *inode, struct file *file) | |
588 | { | |
77970693 JL |
589 | if (file->private_data != NULL) { |
590 | cifsFileInfo_put(file->private_data); | |
591 | file->private_data = NULL; | |
592 | } | |
7ee1af76 | 593 | |
cdff08e7 SF |
594 | /* return code from the ->release op is always ignored */ |
595 | return 0; | |
1da177e4 LT |
596 | } |
597 | ||
598 | int cifs_closedir(struct inode *inode, struct file *file) | |
599 | { | |
600 | int rc = 0; | |
601 | int xid; | |
c21dfb69 | 602 | struct cifsFileInfo *pCFileStruct = file->private_data; |
1da177e4 LT |
603 | char *ptmp; |
604 | ||
b6b38f70 | 605 | cFYI(1, "Closedir inode = 0x%p", inode); |
1da177e4 LT |
606 | |
607 | xid = GetXid(); | |
608 | ||
609 | if (pCFileStruct) { | |
96daf2b0 | 610 | struct cifs_tcon *pTcon = tlink_tcon(pCFileStruct->tlink); |
1da177e4 | 611 | |
b6b38f70 | 612 | cFYI(1, "Freeing private data in close dir"); |
4477288a | 613 | spin_lock(&cifs_file_list_lock); |
4b18f2a9 SF |
614 | if (!pCFileStruct->srch_inf.endOfSearch && |
615 | !pCFileStruct->invalidHandle) { | |
616 | pCFileStruct->invalidHandle = true; | |
4477288a | 617 | spin_unlock(&cifs_file_list_lock); |
1da177e4 | 618 | rc = CIFSFindClose(xid, pTcon, pCFileStruct->netfid); |
b6b38f70 JP |
619 | cFYI(1, "Closing uncompleted readdir with rc %d", |
620 | rc); | |
1da177e4 LT |
621 | /* not much we can do if it fails anyway, ignore rc */ |
622 | rc = 0; | |
ddb4cbfc | 623 | } else |
4477288a | 624 | spin_unlock(&cifs_file_list_lock); |
1da177e4 LT |
625 | ptmp = pCFileStruct->srch_inf.ntwrk_buf_start; |
626 | if (ptmp) { | |
b6b38f70 | 627 | cFYI(1, "closedir free smb buf in srch struct"); |
1da177e4 | 628 | pCFileStruct->srch_inf.ntwrk_buf_start = NULL; |
fb8c4b14 | 629 | if (pCFileStruct->srch_inf.smallBuf) |
d47d7c1a SF |
630 | cifs_small_buf_release(ptmp); |
631 | else | |
632 | cifs_buf_release(ptmp); | |
1da177e4 | 633 | } |
13cfb733 | 634 | cifs_put_tlink(pCFileStruct->tlink); |
1da177e4 LT |
635 | kfree(file->private_data); |
636 | file->private_data = NULL; | |
637 | } | |
638 | /* BB can we lock the filestruct while this is going on? */ | |
639 | FreeXid(xid); | |
640 | return rc; | |
641 | } | |
642 | ||
d59dad2b | 643 | static int store_file_lock(struct cifsInodeInfo *cinode, __u64 len, |
03776f45 | 644 | __u64 offset, __u8 type, __u16 netfid) |
7ee1af76 | 645 | { |
fb8c4b14 SF |
646 | struct cifsLockInfo *li = |
647 | kmalloc(sizeof(struct cifsLockInfo), GFP_KERNEL); | |
7ee1af76 JA |
648 | if (li == NULL) |
649 | return -ENOMEM; | |
d59dad2b | 650 | li->netfid = netfid; |
7ee1af76 JA |
651 | li->offset = offset; |
652 | li->length = len; | |
03776f45 PS |
653 | li->type = type; |
654 | li->pid = current->tgid; | |
d59dad2b PS |
655 | mutex_lock(&cinode->lock_mutex); |
656 | list_add_tail(&li->llist, &cinode->llist); | |
657 | mutex_unlock(&cinode->lock_mutex); | |
7ee1af76 JA |
658 | return 0; |
659 | } | |
660 | ||
03776f45 PS |
661 | static void |
662 | cifs_read_flock(struct file_lock *flock, __u8 *type, int *lock, int *unlock, | |
663 | bool *wait_flag) | |
1da177e4 | 664 | { |
03776f45 | 665 | if (flock->fl_flags & FL_POSIX) |
b6b38f70 | 666 | cFYI(1, "Posix"); |
03776f45 | 667 | if (flock->fl_flags & FL_FLOCK) |
b6b38f70 | 668 | cFYI(1, "Flock"); |
03776f45 | 669 | if (flock->fl_flags & FL_SLEEP) { |
b6b38f70 | 670 | cFYI(1, "Blocking lock"); |
03776f45 | 671 | *wait_flag = true; |
1da177e4 | 672 | } |
03776f45 | 673 | if (flock->fl_flags & FL_ACCESS) |
b6b38f70 | 674 | cFYI(1, "Process suspended by mandatory locking - " |
03776f45 PS |
675 | "not implemented yet"); |
676 | if (flock->fl_flags & FL_LEASE) | |
b6b38f70 | 677 | cFYI(1, "Lease on file - not implemented yet"); |
03776f45 | 678 | if (flock->fl_flags & |
1da177e4 | 679 | (~(FL_POSIX | FL_FLOCK | FL_SLEEP | FL_ACCESS | FL_LEASE))) |
03776f45 | 680 | cFYI(1, "Unknown lock flags 0x%x", flock->fl_flags); |
1da177e4 | 681 | |
03776f45 PS |
682 | *type = LOCKING_ANDX_LARGE_FILES; |
683 | if (flock->fl_type == F_WRLCK) { | |
b6b38f70 | 684 | cFYI(1, "F_WRLCK "); |
03776f45 PS |
685 | *lock = 1; |
686 | } else if (flock->fl_type == F_UNLCK) { | |
b6b38f70 | 687 | cFYI(1, "F_UNLCK"); |
03776f45 PS |
688 | *unlock = 1; |
689 | /* Check if unlock includes more than one lock range */ | |
690 | } else if (flock->fl_type == F_RDLCK) { | |
b6b38f70 | 691 | cFYI(1, "F_RDLCK"); |
03776f45 PS |
692 | *type |= LOCKING_ANDX_SHARED_LOCK; |
693 | *lock = 1; | |
694 | } else if (flock->fl_type == F_EXLCK) { | |
b6b38f70 | 695 | cFYI(1, "F_EXLCK"); |
03776f45 PS |
696 | *lock = 1; |
697 | } else if (flock->fl_type == F_SHLCK) { | |
b6b38f70 | 698 | cFYI(1, "F_SHLCK"); |
03776f45 PS |
699 | *type |= LOCKING_ANDX_SHARED_LOCK; |
700 | *lock = 1; | |
1da177e4 | 701 | } else |
b6b38f70 | 702 | cFYI(1, "Unknown type of lock"); |
03776f45 | 703 | } |
1da177e4 | 704 | |
03776f45 PS |
705 | static int |
706 | cifs_getlk(struct cifsFileInfo *cfile, struct file_lock *flock, __u8 type, | |
707 | bool wait_flag, bool posix_lck, int xid) | |
708 | { | |
709 | int rc = 0; | |
710 | __u64 length = 1 + flock->fl_end - flock->fl_start; | |
711 | __u16 netfid = cfile->netfid; | |
712 | struct cifs_tcon *tcon = tlink_tcon(cfile->tlink); | |
f05337c6 | 713 | |
03776f45 PS |
714 | if (posix_lck) { |
715 | int posix_lock_type; | |
716 | if (type & LOCKING_ANDX_SHARED_LOCK) | |
717 | posix_lock_type = CIFS_RDLCK; | |
718 | else | |
719 | posix_lock_type = CIFS_WRLCK; | |
720 | rc = CIFSSMBPosixLock(xid, tcon, netfid, 1 /* get */, | |
721 | length, flock, posix_lock_type, | |
722 | wait_flag); | |
723 | return rc; | |
724 | } | |
1da177e4 | 725 | |
03776f45 PS |
726 | /* BB we could chain these into one lock request BB */ |
727 | rc = CIFSSMBLock(xid, tcon, netfid, current->tgid, length, | |
728 | flock->fl_start, 0, 1, type, 0, 0); | |
729 | if (rc == 0) { | |
730 | rc = CIFSSMBLock(xid, tcon, netfid, current->tgid, | |
731 | length, flock->fl_start, 1, 0, | |
732 | type, 0, 0); | |
733 | flock->fl_type = F_UNLCK; | |
734 | if (rc != 0) | |
735 | cERROR(1, "Error unlocking previously locked " | |
736 | "range %d during test of lock", rc); | |
737 | rc = 0; | |
1da177e4 LT |
738 | return rc; |
739 | } | |
7ee1af76 | 740 | |
03776f45 PS |
741 | if (type & LOCKING_ANDX_SHARED_LOCK) { |
742 | flock->fl_type = F_WRLCK; | |
743 | rc = 0; | |
744 | return rc; | |
7ee1af76 JA |
745 | } |
746 | ||
03776f45 PS |
747 | rc = CIFSSMBLock(xid, tcon, netfid, current->tgid, length, |
748 | flock->fl_start, 0, 1, | |
749 | type | LOCKING_ANDX_SHARED_LOCK, 0, 0); | |
750 | if (rc == 0) { | |
751 | rc = CIFSSMBLock(xid, tcon, netfid, current->tgid, | |
752 | length, flock->fl_start, 1, 0, | |
753 | type | LOCKING_ANDX_SHARED_LOCK, | |
754 | 0, 0); | |
755 | flock->fl_type = F_RDLCK; | |
756 | if (rc != 0) | |
757 | cERROR(1, "Error unlocking previously locked " | |
758 | "range %d during test of lock", rc); | |
759 | } else | |
760 | flock->fl_type = F_WRLCK; | |
761 | ||
762 | rc = 0; | |
763 | return rc; | |
764 | } | |
765 | ||
766 | static int | |
767 | cifs_setlk(struct file *file, struct file_lock *flock, __u8 type, | |
768 | bool wait_flag, bool posix_lck, int lock, int unlock, int xid) | |
769 | { | |
770 | int rc = 0; | |
771 | __u64 length = 1 + flock->fl_end - flock->fl_start; | |
772 | struct cifsFileInfo *cfile = (struct cifsFileInfo *)file->private_data; | |
773 | struct cifs_tcon *tcon = tlink_tcon(cfile->tlink); | |
d59dad2b | 774 | struct cifsInodeInfo *cinode = CIFS_I(file->f_path.dentry->d_inode); |
03776f45 PS |
775 | __u16 netfid = cfile->netfid; |
776 | ||
777 | if (posix_lck) { | |
08547b03 | 778 | int posix_lock_type; |
03776f45 | 779 | if (type & LOCKING_ANDX_SHARED_LOCK) |
08547b03 SF |
780 | posix_lock_type = CIFS_RDLCK; |
781 | else | |
782 | posix_lock_type = CIFS_WRLCK; | |
50c2f753 | 783 | |
03776f45 | 784 | if (unlock == 1) |
beb84dc8 | 785 | posix_lock_type = CIFS_UNLCK; |
7ee1af76 | 786 | |
03776f45 PS |
787 | rc = CIFSSMBPosixLock(xid, tcon, netfid, 0 /* set */, length, |
788 | flock, posix_lock_type, wait_flag); | |
789 | goto out; | |
790 | } | |
7ee1af76 | 791 | |
03776f45 PS |
792 | if (lock) { |
793 | rc = CIFSSMBLock(xid, tcon, netfid, current->tgid, length, | |
794 | flock->fl_start, 0, lock, type, wait_flag, 0); | |
795 | if (rc == 0) { | |
796 | /* For Windows locks we must store them. */ | |
d59dad2b | 797 | rc = store_file_lock(cinode, length, flock->fl_start, |
03776f45 PS |
798 | type, netfid); |
799 | } | |
800 | } else if (unlock) { | |
801 | /* | |
802 | * For each stored lock that this unlock overlaps completely, | |
803 | * unlock it. | |
804 | */ | |
805 | int stored_rc = 0; | |
806 | struct cifsLockInfo *li, *tmp; | |
807 | ||
d59dad2b PS |
808 | mutex_lock(&cinode->lock_mutex); |
809 | list_for_each_entry_safe(li, tmp, &cinode->llist, llist) { | |
03776f45 PS |
810 | if (flock->fl_start > li->offset || |
811 | (flock->fl_start + length) < | |
812 | (li->offset + li->length)) | |
813 | continue; | |
814 | if (current->tgid != li->pid) | |
815 | continue; | |
d59dad2b PS |
816 | if (cfile->netfid != li->netfid) |
817 | continue; | |
03776f45 PS |
818 | |
819 | stored_rc = CIFSSMBLock(xid, tcon, netfid, | |
820 | current->tgid, li->length, | |
821 | li->offset, 1, 0, li->type, | |
822 | 0, 0); | |
823 | if (stored_rc) | |
824 | rc = stored_rc; | |
825 | else { | |
826 | list_del(&li->llist); | |
827 | kfree(li); | |
7ee1af76 | 828 | } |
7ee1af76 | 829 | } |
d59dad2b | 830 | mutex_unlock(&cinode->lock_mutex); |
03776f45 PS |
831 | } |
832 | out: | |
833 | if (flock->fl_flags & FL_POSIX) | |
834 | posix_lock_file_wait(file, flock); | |
835 | return rc; | |
836 | } | |
837 | ||
838 | int cifs_lock(struct file *file, int cmd, struct file_lock *flock) | |
839 | { | |
840 | int rc, xid; | |
841 | int lock = 0, unlock = 0; | |
842 | bool wait_flag = false; | |
843 | bool posix_lck = false; | |
844 | struct cifs_sb_info *cifs_sb; | |
845 | struct cifs_tcon *tcon; | |
846 | struct cifsInodeInfo *cinode; | |
847 | struct cifsFileInfo *cfile; | |
848 | __u16 netfid; | |
849 | __u8 type; | |
850 | ||
851 | rc = -EACCES; | |
852 | xid = GetXid(); | |
853 | ||
854 | cFYI(1, "Lock parm: 0x%x flockflags: 0x%x flocktype: 0x%x start: %lld " | |
855 | "end: %lld", cmd, flock->fl_flags, flock->fl_type, | |
856 | flock->fl_start, flock->fl_end); | |
857 | ||
858 | cifs_read_flock(flock, &type, &lock, &unlock, &wait_flag); | |
859 | ||
860 | cifs_sb = CIFS_SB(file->f_path.dentry->d_sb); | |
861 | cfile = (struct cifsFileInfo *)file->private_data; | |
862 | tcon = tlink_tcon(cfile->tlink); | |
863 | netfid = cfile->netfid; | |
864 | cinode = CIFS_I(file->f_path.dentry->d_inode); | |
865 | ||
866 | if ((tcon->ses->capabilities & CAP_UNIX) && | |
867 | (CIFS_UNIX_FCNTL_CAP & le64_to_cpu(tcon->fsUnixInfo.Capability)) && | |
868 | ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NOPOSIXBRL) == 0)) | |
869 | posix_lck = true; | |
870 | /* | |
871 | * BB add code here to normalize offset and length to account for | |
872 | * negative length which we can not accept over the wire. | |
873 | */ | |
874 | if (IS_GETLK(cmd)) { | |
875 | rc = cifs_getlk(cfile, flock, type, wait_flag, posix_lck, xid); | |
876 | FreeXid(xid); | |
877 | return rc; | |
878 | } | |
879 | ||
880 | if (!lock && !unlock) { | |
881 | /* | |
882 | * if no lock or unlock then nothing to do since we do not | |
883 | * know what it is | |
884 | */ | |
885 | FreeXid(xid); | |
886 | return -EOPNOTSUPP; | |
7ee1af76 JA |
887 | } |
888 | ||
03776f45 PS |
889 | rc = cifs_setlk(file, flock, type, wait_flag, posix_lck, lock, unlock, |
890 | xid); | |
1da177e4 LT |
891 | FreeXid(xid); |
892 | return rc; | |
893 | } | |
894 | ||
fbec9ab9 | 895 | /* update the file size (if needed) after a write */ |
72432ffc | 896 | void |
fbec9ab9 JL |
897 | cifs_update_eof(struct cifsInodeInfo *cifsi, loff_t offset, |
898 | unsigned int bytes_written) | |
899 | { | |
900 | loff_t end_of_write = offset + bytes_written; | |
901 | ||
902 | if (end_of_write > cifsi->server_eof) | |
903 | cifsi->server_eof = end_of_write; | |
904 | } | |
905 | ||
fa2989f4 | 906 | static ssize_t cifs_write(struct cifsFileInfo *open_file, __u32 pid, |
7da4b49a JL |
907 | const char *write_data, size_t write_size, |
908 | loff_t *poffset) | |
1da177e4 LT |
909 | { |
910 | int rc = 0; | |
911 | unsigned int bytes_written = 0; | |
912 | unsigned int total_written; | |
913 | struct cifs_sb_info *cifs_sb; | |
96daf2b0 | 914 | struct cifs_tcon *pTcon; |
7749981e | 915 | int xid; |
7da4b49a JL |
916 | struct dentry *dentry = open_file->dentry; |
917 | struct cifsInodeInfo *cifsi = CIFS_I(dentry->d_inode); | |
fa2989f4 | 918 | struct cifs_io_parms io_parms; |
1da177e4 | 919 | |
7da4b49a | 920 | cifs_sb = CIFS_SB(dentry->d_sb); |
1da177e4 | 921 | |
b6b38f70 | 922 | cFYI(1, "write %zd bytes to offset %lld of %s", write_size, |
7da4b49a | 923 | *poffset, dentry->d_name.name); |
1da177e4 | 924 | |
13cfb733 | 925 | pTcon = tlink_tcon(open_file->tlink); |
50c2f753 | 926 | |
1da177e4 | 927 | xid = GetXid(); |
1da177e4 | 928 | |
1da177e4 LT |
929 | for (total_written = 0; write_size > total_written; |
930 | total_written += bytes_written) { | |
931 | rc = -EAGAIN; | |
932 | while (rc == -EAGAIN) { | |
ca83ce3d JL |
933 | struct kvec iov[2]; |
934 | unsigned int len; | |
935 | ||
1da177e4 | 936 | if (open_file->invalidHandle) { |
1da177e4 LT |
937 | /* we could deadlock if we called |
938 | filemap_fdatawait from here so tell | |
fb8c4b14 | 939 | reopen_file not to flush data to |
1da177e4 | 940 | server now */ |
15886177 | 941 | rc = cifs_reopen_file(open_file, false); |
1da177e4 LT |
942 | if (rc != 0) |
943 | break; | |
944 | } | |
ca83ce3d JL |
945 | |
946 | len = min((size_t)cifs_sb->wsize, | |
947 | write_size - total_written); | |
948 | /* iov[0] is reserved for smb header */ | |
949 | iov[1].iov_base = (char *)write_data + total_written; | |
950 | iov[1].iov_len = len; | |
fa2989f4 PS |
951 | io_parms.netfid = open_file->netfid; |
952 | io_parms.pid = pid; | |
953 | io_parms.tcon = pTcon; | |
954 | io_parms.offset = *poffset; | |
955 | io_parms.length = len; | |
956 | rc = CIFSSMBWrite2(xid, &io_parms, &bytes_written, iov, | |
957 | 1, 0); | |
1da177e4 LT |
958 | } |
959 | if (rc || (bytes_written == 0)) { | |
960 | if (total_written) | |
961 | break; | |
962 | else { | |
963 | FreeXid(xid); | |
964 | return rc; | |
965 | } | |
fbec9ab9 JL |
966 | } else { |
967 | cifs_update_eof(cifsi, *poffset, bytes_written); | |
1da177e4 | 968 | *poffset += bytes_written; |
fbec9ab9 | 969 | } |
1da177e4 LT |
970 | } |
971 | ||
a4544347 | 972 | cifs_stats_bytes_written(pTcon, total_written); |
1da177e4 | 973 | |
7da4b49a JL |
974 | if (total_written > 0) { |
975 | spin_lock(&dentry->d_inode->i_lock); | |
976 | if (*poffset > dentry->d_inode->i_size) | |
977 | i_size_write(dentry->d_inode, *poffset); | |
978 | spin_unlock(&dentry->d_inode->i_lock); | |
1da177e4 | 979 | } |
7da4b49a | 980 | mark_inode_dirty_sync(dentry->d_inode); |
1da177e4 LT |
981 | FreeXid(xid); |
982 | return total_written; | |
983 | } | |
984 | ||
6508d904 JL |
985 | struct cifsFileInfo *find_readable_file(struct cifsInodeInfo *cifs_inode, |
986 | bool fsuid_only) | |
630f3f0c SF |
987 | { |
988 | struct cifsFileInfo *open_file = NULL; | |
6508d904 JL |
989 | struct cifs_sb_info *cifs_sb = CIFS_SB(cifs_inode->vfs_inode.i_sb); |
990 | ||
991 | /* only filter by fsuid on multiuser mounts */ | |
992 | if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MULTIUSER)) | |
993 | fsuid_only = false; | |
630f3f0c | 994 | |
4477288a | 995 | spin_lock(&cifs_file_list_lock); |
630f3f0c SF |
996 | /* we could simply get the first_list_entry since write-only entries |
997 | are always at the end of the list but since the first entry might | |
998 | have a close pending, we go through the whole list */ | |
999 | list_for_each_entry(open_file, &cifs_inode->openFileList, flist) { | |
6508d904 JL |
1000 | if (fsuid_only && open_file->uid != current_fsuid()) |
1001 | continue; | |
2e396b83 | 1002 | if (OPEN_FMODE(open_file->f_flags) & FMODE_READ) { |
630f3f0c SF |
1003 | if (!open_file->invalidHandle) { |
1004 | /* found a good file */ | |
1005 | /* lock it so it will not be closed on us */ | |
6ab409b5 | 1006 | cifsFileInfo_get(open_file); |
4477288a | 1007 | spin_unlock(&cifs_file_list_lock); |
630f3f0c SF |
1008 | return open_file; |
1009 | } /* else might as well continue, and look for | |
1010 | another, or simply have the caller reopen it | |
1011 | again rather than trying to fix this handle */ | |
1012 | } else /* write only file */ | |
1013 | break; /* write only files are last so must be done */ | |
1014 | } | |
4477288a | 1015 | spin_unlock(&cifs_file_list_lock); |
630f3f0c SF |
1016 | return NULL; |
1017 | } | |
630f3f0c | 1018 | |
6508d904 JL |
1019 | struct cifsFileInfo *find_writable_file(struct cifsInodeInfo *cifs_inode, |
1020 | bool fsuid_only) | |
6148a742 SF |
1021 | { |
1022 | struct cifsFileInfo *open_file; | |
d3892294 | 1023 | struct cifs_sb_info *cifs_sb; |
2846d386 | 1024 | bool any_available = false; |
dd99cd80 | 1025 | int rc; |
6148a742 | 1026 | |
60808233 SF |
1027 | /* Having a null inode here (because mapping->host was set to zero by |
1028 | the VFS or MM) should not happen but we had reports of on oops (due to | |
1029 | it being zero) during stress testcases so we need to check for it */ | |
1030 | ||
fb8c4b14 | 1031 | if (cifs_inode == NULL) { |
b6b38f70 | 1032 | cERROR(1, "Null inode passed to cifs_writeable_file"); |
60808233 SF |
1033 | dump_stack(); |
1034 | return NULL; | |
1035 | } | |
1036 | ||
d3892294 JL |
1037 | cifs_sb = CIFS_SB(cifs_inode->vfs_inode.i_sb); |
1038 | ||
6508d904 JL |
1039 | /* only filter by fsuid on multiuser mounts */ |
1040 | if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MULTIUSER)) | |
1041 | fsuid_only = false; | |
1042 | ||
4477288a | 1043 | spin_lock(&cifs_file_list_lock); |
9b22b0b7 | 1044 | refind_writable: |
6148a742 | 1045 | list_for_each_entry(open_file, &cifs_inode->openFileList, flist) { |
6508d904 JL |
1046 | if (!any_available && open_file->pid != current->tgid) |
1047 | continue; | |
1048 | if (fsuid_only && open_file->uid != current_fsuid()) | |
6148a742 | 1049 | continue; |
2e396b83 | 1050 | if (OPEN_FMODE(open_file->f_flags) & FMODE_WRITE) { |
6ab409b5 | 1051 | cifsFileInfo_get(open_file); |
9b22b0b7 SF |
1052 | |
1053 | if (!open_file->invalidHandle) { | |
1054 | /* found a good writable file */ | |
4477288a | 1055 | spin_unlock(&cifs_file_list_lock); |
9b22b0b7 SF |
1056 | return open_file; |
1057 | } | |
8840dee9 | 1058 | |
4477288a | 1059 | spin_unlock(&cifs_file_list_lock); |
cdff08e7 | 1060 | |
9b22b0b7 | 1061 | /* Had to unlock since following call can block */ |
15886177 | 1062 | rc = cifs_reopen_file(open_file, false); |
cdff08e7 SF |
1063 | if (!rc) |
1064 | return open_file; | |
9b22b0b7 | 1065 | |
cdff08e7 | 1066 | /* if it fails, try another handle if possible */ |
b6b38f70 | 1067 | cFYI(1, "wp failed on reopen file"); |
6ab409b5 | 1068 | cifsFileInfo_put(open_file); |
8840dee9 | 1069 | |
cdff08e7 SF |
1070 | spin_lock(&cifs_file_list_lock); |
1071 | ||
9b22b0b7 SF |
1072 | /* else we simply continue to the next entry. Thus |
1073 | we do not loop on reopen errors. If we | |
1074 | can not reopen the file, for example if we | |
1075 | reconnected to a server with another client | |
1076 | racing to delete or lock the file we would not | |
1077 | make progress if we restarted before the beginning | |
1078 | of the loop here. */ | |
6148a742 SF |
1079 | } |
1080 | } | |
2846d386 JL |
1081 | /* couldn't find useable FH with same pid, try any available */ |
1082 | if (!any_available) { | |
1083 | any_available = true; | |
1084 | goto refind_writable; | |
1085 | } | |
4477288a | 1086 | spin_unlock(&cifs_file_list_lock); |
6148a742 SF |
1087 | return NULL; |
1088 | } | |
1089 | ||
1da177e4 LT |
1090 | static int cifs_partialpagewrite(struct page *page, unsigned from, unsigned to) |
1091 | { | |
1092 | struct address_space *mapping = page->mapping; | |
1093 | loff_t offset = (loff_t)page->index << PAGE_CACHE_SHIFT; | |
1094 | char *write_data; | |
1095 | int rc = -EFAULT; | |
1096 | int bytes_written = 0; | |
1da177e4 | 1097 | struct inode *inode; |
6148a742 | 1098 | struct cifsFileInfo *open_file; |
1da177e4 LT |
1099 | |
1100 | if (!mapping || !mapping->host) | |
1101 | return -EFAULT; | |
1102 | ||
1103 | inode = page->mapping->host; | |
1da177e4 LT |
1104 | |
1105 | offset += (loff_t)from; | |
1106 | write_data = kmap(page); | |
1107 | write_data += from; | |
1108 | ||
1109 | if ((to > PAGE_CACHE_SIZE) || (from > to)) { | |
1110 | kunmap(page); | |
1111 | return -EIO; | |
1112 | } | |
1113 | ||
1114 | /* racing with truncate? */ | |
1115 | if (offset > mapping->host->i_size) { | |
1116 | kunmap(page); | |
1117 | return 0; /* don't care */ | |
1118 | } | |
1119 | ||
1120 | /* check to make sure that we are not extending the file */ | |
1121 | if (mapping->host->i_size - offset < (loff_t)to) | |
fb8c4b14 | 1122 | to = (unsigned)(mapping->host->i_size - offset); |
1da177e4 | 1123 | |
6508d904 | 1124 | open_file = find_writable_file(CIFS_I(mapping->host), false); |
6148a742 | 1125 | if (open_file) { |
fa2989f4 PS |
1126 | bytes_written = cifs_write(open_file, open_file->pid, |
1127 | write_data, to - from, &offset); | |
6ab409b5 | 1128 | cifsFileInfo_put(open_file); |
1da177e4 | 1129 | /* Does mm or vfs already set times? */ |
6148a742 | 1130 | inode->i_atime = inode->i_mtime = current_fs_time(inode->i_sb); |
bb5a9a04 | 1131 | if ((bytes_written > 0) && (offset)) |
6148a742 | 1132 | rc = 0; |
bb5a9a04 SF |
1133 | else if (bytes_written < 0) |
1134 | rc = bytes_written; | |
6148a742 | 1135 | } else { |
b6b38f70 | 1136 | cFYI(1, "No writeable filehandles for inode"); |
1da177e4 LT |
1137 | rc = -EIO; |
1138 | } | |
1139 | ||
1140 | kunmap(page); | |
1141 | return rc; | |
1142 | } | |
1143 | ||
1da177e4 | 1144 | static int cifs_writepages(struct address_space *mapping, |
37c0eb46 | 1145 | struct writeback_control *wbc) |
1da177e4 | 1146 | { |
c3d17b63 JL |
1147 | struct cifs_sb_info *cifs_sb = CIFS_SB(mapping->host->i_sb); |
1148 | bool done = false, scanned = false, range_whole = false; | |
1149 | pgoff_t end, index; | |
1150 | struct cifs_writedata *wdata; | |
37c0eb46 | 1151 | struct page *page; |
37c0eb46 | 1152 | int rc = 0; |
50c2f753 | 1153 | |
37c0eb46 | 1154 | /* |
c3d17b63 | 1155 | * If wsize is smaller than the page cache size, default to writing |
37c0eb46 SF |
1156 | * one page at a time via cifs_writepage |
1157 | */ | |
1158 | if (cifs_sb->wsize < PAGE_CACHE_SIZE) | |
1159 | return generic_writepages(mapping, wbc); | |
1160 | ||
111ebb6e | 1161 | if (wbc->range_cyclic) { |
37c0eb46 | 1162 | index = mapping->writeback_index; /* Start from prev offset */ |
111ebb6e OH |
1163 | end = -1; |
1164 | } else { | |
1165 | index = wbc->range_start >> PAGE_CACHE_SHIFT; | |
1166 | end = wbc->range_end >> PAGE_CACHE_SHIFT; | |
1167 | if (wbc->range_start == 0 && wbc->range_end == LLONG_MAX) | |
c3d17b63 JL |
1168 | range_whole = true; |
1169 | scanned = true; | |
37c0eb46 SF |
1170 | } |
1171 | retry: | |
c3d17b63 JL |
1172 | while (!done && index <= end) { |
1173 | unsigned int i, nr_pages, found_pages; | |
1174 | pgoff_t next = 0, tofind; | |
1175 | struct page **pages; | |
1176 | ||
1177 | tofind = min((cifs_sb->wsize / PAGE_CACHE_SIZE) - 1, | |
1178 | end - index) + 1; | |
1179 | ||
1180 | wdata = cifs_writedata_alloc((unsigned int)tofind); | |
1181 | if (!wdata) { | |
1182 | rc = -ENOMEM; | |
1183 | break; | |
1184 | } | |
1185 | ||
1186 | /* | |
1187 | * find_get_pages_tag seems to return a max of 256 on each | |
1188 | * iteration, so we must call it several times in order to | |
1189 | * fill the array or the wsize is effectively limited to | |
1190 | * 256 * PAGE_CACHE_SIZE. | |
1191 | */ | |
1192 | found_pages = 0; | |
1193 | pages = wdata->pages; | |
1194 | do { | |
1195 | nr_pages = find_get_pages_tag(mapping, &index, | |
1196 | PAGECACHE_TAG_DIRTY, | |
1197 | tofind, pages); | |
1198 | found_pages += nr_pages; | |
1199 | tofind -= nr_pages; | |
1200 | pages += nr_pages; | |
1201 | } while (nr_pages && tofind && index <= end); | |
1202 | ||
1203 | if (found_pages == 0) { | |
1204 | kref_put(&wdata->refcount, cifs_writedata_release); | |
1205 | break; | |
1206 | } | |
1207 | ||
1208 | nr_pages = 0; | |
1209 | for (i = 0; i < found_pages; i++) { | |
1210 | page = wdata->pages[i]; | |
37c0eb46 SF |
1211 | /* |
1212 | * At this point we hold neither mapping->tree_lock nor | |
1213 | * lock on the page itself: the page may be truncated or | |
1214 | * invalidated (changing page->mapping to NULL), or even | |
1215 | * swizzled back from swapper_space to tmpfs file | |
1216 | * mapping | |
1217 | */ | |
1218 | ||
c3d17b63 | 1219 | if (nr_pages == 0) |
37c0eb46 | 1220 | lock_page(page); |
529ae9aa | 1221 | else if (!trylock_page(page)) |
37c0eb46 SF |
1222 | break; |
1223 | ||
1224 | if (unlikely(page->mapping != mapping)) { | |
1225 | unlock_page(page); | |
1226 | break; | |
1227 | } | |
1228 | ||
111ebb6e | 1229 | if (!wbc->range_cyclic && page->index > end) { |
c3d17b63 | 1230 | done = true; |
37c0eb46 SF |
1231 | unlock_page(page); |
1232 | break; | |
1233 | } | |
1234 | ||
1235 | if (next && (page->index != next)) { | |
1236 | /* Not next consecutive page */ | |
1237 | unlock_page(page); | |
1238 | break; | |
1239 | } | |
1240 | ||
1241 | if (wbc->sync_mode != WB_SYNC_NONE) | |
1242 | wait_on_page_writeback(page); | |
1243 | ||
1244 | if (PageWriteback(page) || | |
cb876f45 | 1245 | !clear_page_dirty_for_io(page)) { |
37c0eb46 SF |
1246 | unlock_page(page); |
1247 | break; | |
1248 | } | |
84d2f07e | 1249 | |
cb876f45 LT |
1250 | /* |
1251 | * This actually clears the dirty bit in the radix tree. | |
1252 | * See cifs_writepage() for more commentary. | |
1253 | */ | |
1254 | set_page_writeback(page); | |
1255 | ||
84d2f07e | 1256 | if (page_offset(page) >= mapping->host->i_size) { |
c3d17b63 | 1257 | done = true; |
84d2f07e | 1258 | unlock_page(page); |
cb876f45 | 1259 | end_page_writeback(page); |
84d2f07e SF |
1260 | break; |
1261 | } | |
1262 | ||
c3d17b63 JL |
1263 | wdata->pages[i] = page; |
1264 | next = page->index + 1; | |
1265 | ++nr_pages; | |
1266 | } | |
37c0eb46 | 1267 | |
c3d17b63 JL |
1268 | /* reset index to refind any pages skipped */ |
1269 | if (nr_pages == 0) | |
1270 | index = wdata->pages[0]->index + 1; | |
84d2f07e | 1271 | |
c3d17b63 JL |
1272 | /* put any pages we aren't going to use */ |
1273 | for (i = nr_pages; i < found_pages; i++) { | |
1274 | page_cache_release(wdata->pages[i]); | |
1275 | wdata->pages[i] = NULL; | |
1276 | } | |
37c0eb46 | 1277 | |
c3d17b63 JL |
1278 | /* nothing to write? */ |
1279 | if (nr_pages == 0) { | |
1280 | kref_put(&wdata->refcount, cifs_writedata_release); | |
1281 | continue; | |
37c0eb46 | 1282 | } |
fbec9ab9 | 1283 | |
c3d17b63 JL |
1284 | wdata->sync_mode = wbc->sync_mode; |
1285 | wdata->nr_pages = nr_pages; | |
1286 | wdata->offset = page_offset(wdata->pages[0]); | |
941b853d | 1287 | |
c3d17b63 JL |
1288 | do { |
1289 | if (wdata->cfile != NULL) | |
1290 | cifsFileInfo_put(wdata->cfile); | |
1291 | wdata->cfile = find_writable_file(CIFS_I(mapping->host), | |
1292 | false); | |
1293 | if (!wdata->cfile) { | |
1294 | cERROR(1, "No writable handles for inode"); | |
1295 | rc = -EBADF; | |
1296 | break; | |
941b853d | 1297 | } |
c3d17b63 JL |
1298 | rc = cifs_async_writev(wdata); |
1299 | } while (wbc->sync_mode == WB_SYNC_ALL && rc == -EAGAIN); | |
941b853d | 1300 | |
c3d17b63 JL |
1301 | for (i = 0; i < nr_pages; ++i) |
1302 | unlock_page(wdata->pages[i]); | |
f3983c21 | 1303 | |
c3d17b63 JL |
1304 | /* send failure -- clean up the mess */ |
1305 | if (rc != 0) { | |
1306 | for (i = 0; i < nr_pages; ++i) { | |
941b853d | 1307 | if (rc == -EAGAIN) |
c3d17b63 JL |
1308 | redirty_page_for_writepage(wbc, |
1309 | wdata->pages[i]); | |
1310 | else | |
1311 | SetPageError(wdata->pages[i]); | |
1312 | end_page_writeback(wdata->pages[i]); | |
1313 | page_cache_release(wdata->pages[i]); | |
37c0eb46 | 1314 | } |
941b853d JL |
1315 | if (rc != -EAGAIN) |
1316 | mapping_set_error(mapping, rc); | |
c3d17b63 JL |
1317 | } |
1318 | kref_put(&wdata->refcount, cifs_writedata_release); | |
941b853d | 1319 | |
c3d17b63 JL |
1320 | wbc->nr_to_write -= nr_pages; |
1321 | if (wbc->nr_to_write <= 0) | |
1322 | done = true; | |
b066a48c | 1323 | |
c3d17b63 | 1324 | index = next; |
37c0eb46 | 1325 | } |
c3d17b63 | 1326 | |
37c0eb46 SF |
1327 | if (!scanned && !done) { |
1328 | /* | |
1329 | * We hit the last page and there is more work to be done: wrap | |
1330 | * back to the start of the file | |
1331 | */ | |
c3d17b63 | 1332 | scanned = true; |
37c0eb46 SF |
1333 | index = 0; |
1334 | goto retry; | |
1335 | } | |
c3d17b63 | 1336 | |
111ebb6e | 1337 | if (wbc->range_cyclic || (range_whole && wbc->nr_to_write > 0)) |
37c0eb46 SF |
1338 | mapping->writeback_index = index; |
1339 | ||
1da177e4 LT |
1340 | return rc; |
1341 | } | |
1da177e4 | 1342 | |
9ad1506b PS |
1343 | static int |
1344 | cifs_writepage_locked(struct page *page, struct writeback_control *wbc) | |
1da177e4 | 1345 | { |
9ad1506b | 1346 | int rc; |
1da177e4 LT |
1347 | int xid; |
1348 | ||
1349 | xid = GetXid(); | |
1350 | /* BB add check for wbc flags */ | |
1351 | page_cache_get(page); | |
ad7a2926 | 1352 | if (!PageUptodate(page)) |
b6b38f70 | 1353 | cFYI(1, "ppw - page not up to date"); |
cb876f45 LT |
1354 | |
1355 | /* | |
1356 | * Set the "writeback" flag, and clear "dirty" in the radix tree. | |
1357 | * | |
1358 | * A writepage() implementation always needs to do either this, | |
1359 | * or re-dirty the page with "redirty_page_for_writepage()" in | |
1360 | * the case of a failure. | |
1361 | * | |
1362 | * Just unlocking the page will cause the radix tree tag-bits | |
1363 | * to fail to update with the state of the page correctly. | |
1364 | */ | |
fb8c4b14 | 1365 | set_page_writeback(page); |
9ad1506b | 1366 | retry_write: |
1da177e4 | 1367 | rc = cifs_partialpagewrite(page, 0, PAGE_CACHE_SIZE); |
9ad1506b PS |
1368 | if (rc == -EAGAIN && wbc->sync_mode == WB_SYNC_ALL) |
1369 | goto retry_write; | |
1370 | else if (rc == -EAGAIN) | |
1371 | redirty_page_for_writepage(wbc, page); | |
1372 | else if (rc != 0) | |
1373 | SetPageError(page); | |
1374 | else | |
1375 | SetPageUptodate(page); | |
cb876f45 LT |
1376 | end_page_writeback(page); |
1377 | page_cache_release(page); | |
1da177e4 LT |
1378 | FreeXid(xid); |
1379 | return rc; | |
1380 | } | |
1381 | ||
9ad1506b PS |
1382 | static int cifs_writepage(struct page *page, struct writeback_control *wbc) |
1383 | { | |
1384 | int rc = cifs_writepage_locked(page, wbc); | |
1385 | unlock_page(page); | |
1386 | return rc; | |
1387 | } | |
1388 | ||
d9414774 NP |
1389 | static int cifs_write_end(struct file *file, struct address_space *mapping, |
1390 | loff_t pos, unsigned len, unsigned copied, | |
1391 | struct page *page, void *fsdata) | |
1da177e4 | 1392 | { |
d9414774 NP |
1393 | int rc; |
1394 | struct inode *inode = mapping->host; | |
d4ffff1f PS |
1395 | struct cifsFileInfo *cfile = file->private_data; |
1396 | struct cifs_sb_info *cifs_sb = CIFS_SB(cfile->dentry->d_sb); | |
1397 | __u32 pid; | |
1398 | ||
1399 | if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_RWPIDFORWARD) | |
1400 | pid = cfile->pid; | |
1401 | else | |
1402 | pid = current->tgid; | |
1da177e4 | 1403 | |
b6b38f70 JP |
1404 | cFYI(1, "write_end for page %p from pos %lld with %d bytes", |
1405 | page, pos, copied); | |
d9414774 | 1406 | |
a98ee8c1 JL |
1407 | if (PageChecked(page)) { |
1408 | if (copied == len) | |
1409 | SetPageUptodate(page); | |
1410 | ClearPageChecked(page); | |
1411 | } else if (!PageUptodate(page) && copied == PAGE_CACHE_SIZE) | |
d9414774 | 1412 | SetPageUptodate(page); |
ad7a2926 | 1413 | |
1da177e4 | 1414 | if (!PageUptodate(page)) { |
d9414774 NP |
1415 | char *page_data; |
1416 | unsigned offset = pos & (PAGE_CACHE_SIZE - 1); | |
1417 | int xid; | |
1418 | ||
1419 | xid = GetXid(); | |
1da177e4 LT |
1420 | /* this is probably better than directly calling |
1421 | partialpage_write since in this function the file handle is | |
1422 | known which we might as well leverage */ | |
1423 | /* BB check if anything else missing out of ppw | |
1424 | such as updating last write time */ | |
1425 | page_data = kmap(page); | |
d4ffff1f | 1426 | rc = cifs_write(cfile, pid, page_data + offset, copied, &pos); |
d9414774 | 1427 | /* if (rc < 0) should we set writebehind rc? */ |
1da177e4 | 1428 | kunmap(page); |
d9414774 NP |
1429 | |
1430 | FreeXid(xid); | |
fb8c4b14 | 1431 | } else { |
d9414774 NP |
1432 | rc = copied; |
1433 | pos += copied; | |
1da177e4 LT |
1434 | set_page_dirty(page); |
1435 | } | |
1436 | ||
d9414774 NP |
1437 | if (rc > 0) { |
1438 | spin_lock(&inode->i_lock); | |
1439 | if (pos > inode->i_size) | |
1440 | i_size_write(inode, pos); | |
1441 | spin_unlock(&inode->i_lock); | |
1442 | } | |
1443 | ||
1444 | unlock_page(page); | |
1445 | page_cache_release(page); | |
1446 | ||
1da177e4 LT |
1447 | return rc; |
1448 | } | |
1449 | ||
02c24a82 JB |
1450 | int cifs_strict_fsync(struct file *file, loff_t start, loff_t end, |
1451 | int datasync) | |
1da177e4 LT |
1452 | { |
1453 | int xid; | |
1454 | int rc = 0; | |
96daf2b0 | 1455 | struct cifs_tcon *tcon; |
c21dfb69 | 1456 | struct cifsFileInfo *smbfile = file->private_data; |
e6a00296 | 1457 | struct inode *inode = file->f_path.dentry->d_inode; |
8be7e6ba | 1458 | struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb); |
1da177e4 | 1459 | |
02c24a82 JB |
1460 | rc = filemap_write_and_wait_range(inode->i_mapping, start, end); |
1461 | if (rc) | |
1462 | return rc; | |
1463 | mutex_lock(&inode->i_mutex); | |
1464 | ||
1da177e4 LT |
1465 | xid = GetXid(); |
1466 | ||
b6b38f70 | 1467 | cFYI(1, "Sync file - name: %s datasync: 0x%x", |
7ea80859 | 1468 | file->f_path.dentry->d_name.name, datasync); |
50c2f753 | 1469 | |
6feb9891 PS |
1470 | if (!CIFS_I(inode)->clientCanCacheRead) { |
1471 | rc = cifs_invalidate_mapping(inode); | |
1472 | if (rc) { | |
1473 | cFYI(1, "rc: %d during invalidate phase", rc); | |
1474 | rc = 0; /* don't care about it in fsync */ | |
1475 | } | |
1476 | } | |
eb4b756b | 1477 | |
8be7e6ba PS |
1478 | tcon = tlink_tcon(smbfile->tlink); |
1479 | if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NOSSYNC)) | |
1480 | rc = CIFSSMBFlush(xid, tcon, smbfile->netfid); | |
1481 | ||
1482 | FreeXid(xid); | |
02c24a82 | 1483 | mutex_unlock(&inode->i_mutex); |
8be7e6ba PS |
1484 | return rc; |
1485 | } | |
1486 | ||
02c24a82 | 1487 | int cifs_fsync(struct file *file, loff_t start, loff_t end, int datasync) |
8be7e6ba PS |
1488 | { |
1489 | int xid; | |
1490 | int rc = 0; | |
96daf2b0 | 1491 | struct cifs_tcon *tcon; |
8be7e6ba PS |
1492 | struct cifsFileInfo *smbfile = file->private_data; |
1493 | struct cifs_sb_info *cifs_sb = CIFS_SB(file->f_path.dentry->d_sb); | |
02c24a82 JB |
1494 | struct inode *inode = file->f_mapping->host; |
1495 | ||
1496 | rc = filemap_write_and_wait_range(inode->i_mapping, start, end); | |
1497 | if (rc) | |
1498 | return rc; | |
1499 | mutex_lock(&inode->i_mutex); | |
8be7e6ba PS |
1500 | |
1501 | xid = GetXid(); | |
1502 | ||
1503 | cFYI(1, "Sync file - name: %s datasync: 0x%x", | |
1504 | file->f_path.dentry->d_name.name, datasync); | |
1505 | ||
1506 | tcon = tlink_tcon(smbfile->tlink); | |
1507 | if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NOSSYNC)) | |
1508 | rc = CIFSSMBFlush(xid, tcon, smbfile->netfid); | |
b298f223 | 1509 | |
1da177e4 | 1510 | FreeXid(xid); |
02c24a82 | 1511 | mutex_unlock(&inode->i_mutex); |
1da177e4 LT |
1512 | return rc; |
1513 | } | |
1514 | ||
1da177e4 LT |
1515 | /* |
1516 | * As file closes, flush all cached write data for this inode checking | |
1517 | * for write behind errors. | |
1518 | */ | |
75e1fcc0 | 1519 | int cifs_flush(struct file *file, fl_owner_t id) |
1da177e4 | 1520 | { |
fb8c4b14 | 1521 | struct inode *inode = file->f_path.dentry->d_inode; |
1da177e4 LT |
1522 | int rc = 0; |
1523 | ||
eb4b756b | 1524 | if (file->f_mode & FMODE_WRITE) |
d3f1322a | 1525 | rc = filemap_write_and_wait(inode->i_mapping); |
50c2f753 | 1526 | |
b6b38f70 | 1527 | cFYI(1, "Flush inode %p file %p rc %d", inode, file, rc); |
1da177e4 LT |
1528 | |
1529 | return rc; | |
1530 | } | |
1531 | ||
72432ffc PS |
1532 | static int |
1533 | cifs_write_allocate_pages(struct page **pages, unsigned long num_pages) | |
1534 | { | |
1535 | int rc = 0; | |
1536 | unsigned long i; | |
1537 | ||
1538 | for (i = 0; i < num_pages; i++) { | |
1539 | pages[i] = alloc_page(__GFP_HIGHMEM); | |
1540 | if (!pages[i]) { | |
1541 | /* | |
1542 | * save number of pages we have already allocated and | |
1543 | * return with ENOMEM error | |
1544 | */ | |
1545 | num_pages = i; | |
1546 | rc = -ENOMEM; | |
1547 | goto error; | |
1548 | } | |
1549 | } | |
1550 | ||
1551 | return rc; | |
1552 | ||
1553 | error: | |
1554 | for (i = 0; i < num_pages; i++) | |
1555 | put_page(pages[i]); | |
1556 | return rc; | |
1557 | } | |
1558 | ||
1559 | static inline | |
1560 | size_t get_numpages(const size_t wsize, const size_t len, size_t *cur_len) | |
1561 | { | |
1562 | size_t num_pages; | |
1563 | size_t clen; | |
1564 | ||
1565 | clen = min_t(const size_t, len, wsize); | |
1566 | num_pages = clen / PAGE_CACHE_SIZE; | |
1567 | if (clen % PAGE_CACHE_SIZE) | |
1568 | num_pages++; | |
1569 | ||
1570 | if (cur_len) | |
1571 | *cur_len = clen; | |
1572 | ||
1573 | return num_pages; | |
1574 | } | |
1575 | ||
1576 | static ssize_t | |
1577 | cifs_iovec_write(struct file *file, const struct iovec *iov, | |
1578 | unsigned long nr_segs, loff_t *poffset) | |
1579 | { | |
76429c14 PS |
1580 | unsigned int written; |
1581 | unsigned long num_pages, npages, i; | |
1582 | size_t copied, len, cur_len; | |
1583 | ssize_t total_written = 0; | |
72432ffc PS |
1584 | struct kvec *to_send; |
1585 | struct page **pages; | |
1586 | struct iov_iter it; | |
1587 | struct inode *inode; | |
1588 | struct cifsFileInfo *open_file; | |
96daf2b0 | 1589 | struct cifs_tcon *pTcon; |
72432ffc | 1590 | struct cifs_sb_info *cifs_sb; |
fa2989f4 | 1591 | struct cifs_io_parms io_parms; |
72432ffc | 1592 | int xid, rc; |
d4ffff1f | 1593 | __u32 pid; |
72432ffc PS |
1594 | |
1595 | len = iov_length(iov, nr_segs); | |
1596 | if (!len) | |
1597 | return 0; | |
1598 | ||
1599 | rc = generic_write_checks(file, poffset, &len, 0); | |
1600 | if (rc) | |
1601 | return rc; | |
1602 | ||
1603 | cifs_sb = CIFS_SB(file->f_path.dentry->d_sb); | |
1604 | num_pages = get_numpages(cifs_sb->wsize, len, &cur_len); | |
1605 | ||
1606 | pages = kmalloc(sizeof(struct pages *)*num_pages, GFP_KERNEL); | |
1607 | if (!pages) | |
1608 | return -ENOMEM; | |
1609 | ||
1610 | to_send = kmalloc(sizeof(struct kvec)*(num_pages + 1), GFP_KERNEL); | |
1611 | if (!to_send) { | |
1612 | kfree(pages); | |
1613 | return -ENOMEM; | |
1614 | } | |
1615 | ||
1616 | rc = cifs_write_allocate_pages(pages, num_pages); | |
1617 | if (rc) { | |
1618 | kfree(pages); | |
1619 | kfree(to_send); | |
1620 | return rc; | |
1621 | } | |
1622 | ||
1623 | xid = GetXid(); | |
1624 | open_file = file->private_data; | |
d4ffff1f PS |
1625 | |
1626 | if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_RWPIDFORWARD) | |
1627 | pid = open_file->pid; | |
1628 | else | |
1629 | pid = current->tgid; | |
1630 | ||
72432ffc PS |
1631 | pTcon = tlink_tcon(open_file->tlink); |
1632 | inode = file->f_path.dentry->d_inode; | |
1633 | ||
1634 | iov_iter_init(&it, iov, nr_segs, len, 0); | |
1635 | npages = num_pages; | |
1636 | ||
1637 | do { | |
1638 | size_t save_len = cur_len; | |
1639 | for (i = 0; i < npages; i++) { | |
1640 | copied = min_t(const size_t, cur_len, PAGE_CACHE_SIZE); | |
1641 | copied = iov_iter_copy_from_user(pages[i], &it, 0, | |
1642 | copied); | |
1643 | cur_len -= copied; | |
1644 | iov_iter_advance(&it, copied); | |
1645 | to_send[i+1].iov_base = kmap(pages[i]); | |
1646 | to_send[i+1].iov_len = copied; | |
1647 | } | |
1648 | ||
1649 | cur_len = save_len - cur_len; | |
1650 | ||
1651 | do { | |
1652 | if (open_file->invalidHandle) { | |
1653 | rc = cifs_reopen_file(open_file, false); | |
1654 | if (rc != 0) | |
1655 | break; | |
1656 | } | |
fa2989f4 | 1657 | io_parms.netfid = open_file->netfid; |
d4ffff1f | 1658 | io_parms.pid = pid; |
fa2989f4 PS |
1659 | io_parms.tcon = pTcon; |
1660 | io_parms.offset = *poffset; | |
1661 | io_parms.length = cur_len; | |
1662 | rc = CIFSSMBWrite2(xid, &io_parms, &written, to_send, | |
1663 | npages, 0); | |
72432ffc PS |
1664 | } while (rc == -EAGAIN); |
1665 | ||
1666 | for (i = 0; i < npages; i++) | |
1667 | kunmap(pages[i]); | |
1668 | ||
1669 | if (written) { | |
1670 | len -= written; | |
1671 | total_written += written; | |
1672 | cifs_update_eof(CIFS_I(inode), *poffset, written); | |
1673 | *poffset += written; | |
1674 | } else if (rc < 0) { | |
1675 | if (!total_written) | |
1676 | total_written = rc; | |
1677 | break; | |
1678 | } | |
1679 | ||
1680 | /* get length and number of kvecs of the next write */ | |
1681 | npages = get_numpages(cifs_sb->wsize, len, &cur_len); | |
1682 | } while (len > 0); | |
1683 | ||
1684 | if (total_written > 0) { | |
1685 | spin_lock(&inode->i_lock); | |
1686 | if (*poffset > inode->i_size) | |
1687 | i_size_write(inode, *poffset); | |
1688 | spin_unlock(&inode->i_lock); | |
1689 | } | |
1690 | ||
1691 | cifs_stats_bytes_written(pTcon, total_written); | |
1692 | mark_inode_dirty_sync(inode); | |
1693 | ||
1694 | for (i = 0; i < num_pages; i++) | |
1695 | put_page(pages[i]); | |
1696 | kfree(to_send); | |
1697 | kfree(pages); | |
1698 | FreeXid(xid); | |
1699 | return total_written; | |
1700 | } | |
1701 | ||
0b81c1c4 | 1702 | ssize_t cifs_user_writev(struct kiocb *iocb, const struct iovec *iov, |
72432ffc PS |
1703 | unsigned long nr_segs, loff_t pos) |
1704 | { | |
1705 | ssize_t written; | |
1706 | struct inode *inode; | |
1707 | ||
1708 | inode = iocb->ki_filp->f_path.dentry->d_inode; | |
1709 | ||
1710 | /* | |
1711 | * BB - optimize the way when signing is disabled. We can drop this | |
1712 | * extra memory-to-memory copying and use iovec buffers for constructing | |
1713 | * write request. | |
1714 | */ | |
1715 | ||
1716 | written = cifs_iovec_write(iocb->ki_filp, iov, nr_segs, &pos); | |
1717 | if (written > 0) { | |
1718 | CIFS_I(inode)->invalid_mapping = true; | |
1719 | iocb->ki_pos = pos; | |
1720 | } | |
1721 | ||
1722 | return written; | |
1723 | } | |
1724 | ||
1725 | ssize_t cifs_strict_writev(struct kiocb *iocb, const struct iovec *iov, | |
1726 | unsigned long nr_segs, loff_t pos) | |
1727 | { | |
1728 | struct inode *inode; | |
1729 | ||
1730 | inode = iocb->ki_filp->f_path.dentry->d_inode; | |
1731 | ||
1732 | if (CIFS_I(inode)->clientCanCacheAll) | |
1733 | return generic_file_aio_write(iocb, iov, nr_segs, pos); | |
1734 | ||
1735 | /* | |
1736 | * In strict cache mode we need to write the data to the server exactly | |
1737 | * from the pos to pos+len-1 rather than flush all affected pages | |
1738 | * because it may cause a error with mandatory locks on these pages but | |
1739 | * not on the region from pos to ppos+len-1. | |
1740 | */ | |
1741 | ||
1742 | return cifs_user_writev(iocb, iov, nr_segs, pos); | |
1743 | } | |
1744 | ||
a70307ee PS |
1745 | static ssize_t |
1746 | cifs_iovec_read(struct file *file, const struct iovec *iov, | |
1747 | unsigned long nr_segs, loff_t *poffset) | |
1da177e4 | 1748 | { |
a70307ee PS |
1749 | int rc; |
1750 | int xid; | |
76429c14 PS |
1751 | ssize_t total_read; |
1752 | unsigned int bytes_read = 0; | |
a70307ee PS |
1753 | size_t len, cur_len; |
1754 | int iov_offset = 0; | |
1da177e4 | 1755 | struct cifs_sb_info *cifs_sb; |
96daf2b0 | 1756 | struct cifs_tcon *pTcon; |
1da177e4 | 1757 | struct cifsFileInfo *open_file; |
1da177e4 | 1758 | struct smb_com_read_rsp *pSMBr; |
d4ffff1f | 1759 | struct cifs_io_parms io_parms; |
a70307ee | 1760 | char *read_data; |
5eba8ab3 | 1761 | unsigned int rsize; |
d4ffff1f | 1762 | __u32 pid; |
a70307ee PS |
1763 | |
1764 | if (!nr_segs) | |
1765 | return 0; | |
1766 | ||
1767 | len = iov_length(iov, nr_segs); | |
1768 | if (!len) | |
1769 | return 0; | |
1da177e4 LT |
1770 | |
1771 | xid = GetXid(); | |
e6a00296 | 1772 | cifs_sb = CIFS_SB(file->f_path.dentry->d_sb); |
1da177e4 | 1773 | |
5eba8ab3 JL |
1774 | /* FIXME: set up handlers for larger reads and/or convert to async */ |
1775 | rsize = min_t(unsigned int, cifs_sb->rsize, CIFSMaxBufSize); | |
1776 | ||
c21dfb69 | 1777 | open_file = file->private_data; |
13cfb733 | 1778 | pTcon = tlink_tcon(open_file->tlink); |
1da177e4 | 1779 | |
d4ffff1f PS |
1780 | if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_RWPIDFORWARD) |
1781 | pid = open_file->pid; | |
1782 | else | |
1783 | pid = current->tgid; | |
1784 | ||
ad7a2926 | 1785 | if ((file->f_flags & O_ACCMODE) == O_WRONLY) |
b6b38f70 | 1786 | cFYI(1, "attempting read on write only file instance"); |
ad7a2926 | 1787 | |
a70307ee | 1788 | for (total_read = 0; total_read < len; total_read += bytes_read) { |
5eba8ab3 | 1789 | cur_len = min_t(const size_t, len - total_read, rsize); |
1da177e4 | 1790 | rc = -EAGAIN; |
a70307ee PS |
1791 | read_data = NULL; |
1792 | ||
1da177e4 | 1793 | while (rc == -EAGAIN) { |
ec637e3f | 1794 | int buf_type = CIFS_NO_BUFFER; |
cdff08e7 | 1795 | if (open_file->invalidHandle) { |
15886177 | 1796 | rc = cifs_reopen_file(open_file, true); |
1da177e4 LT |
1797 | if (rc != 0) |
1798 | break; | |
1799 | } | |
d4ffff1f PS |
1800 | io_parms.netfid = open_file->netfid; |
1801 | io_parms.pid = pid; | |
1802 | io_parms.tcon = pTcon; | |
1803 | io_parms.offset = *poffset; | |
2cebaa58 | 1804 | io_parms.length = cur_len; |
d4ffff1f | 1805 | rc = CIFSSMBRead(xid, &io_parms, &bytes_read, |
a70307ee PS |
1806 | &read_data, &buf_type); |
1807 | pSMBr = (struct smb_com_read_rsp *)read_data; | |
1808 | if (read_data) { | |
1809 | char *data_offset = read_data + 4 + | |
1810 | le16_to_cpu(pSMBr->DataOffset); | |
1811 | if (memcpy_toiovecend(iov, data_offset, | |
1812 | iov_offset, bytes_read)) | |
93544cc6 | 1813 | rc = -EFAULT; |
fb8c4b14 | 1814 | if (buf_type == CIFS_SMALL_BUFFER) |
a70307ee | 1815 | cifs_small_buf_release(read_data); |
fb8c4b14 | 1816 | else if (buf_type == CIFS_LARGE_BUFFER) |
a70307ee PS |
1817 | cifs_buf_release(read_data); |
1818 | read_data = NULL; | |
1819 | iov_offset += bytes_read; | |
1da177e4 LT |
1820 | } |
1821 | } | |
a70307ee | 1822 | |
1da177e4 LT |
1823 | if (rc || (bytes_read == 0)) { |
1824 | if (total_read) { | |
1825 | break; | |
1826 | } else { | |
1827 | FreeXid(xid); | |
1828 | return rc; | |
1829 | } | |
1830 | } else { | |
a4544347 | 1831 | cifs_stats_bytes_read(pTcon, bytes_read); |
1da177e4 LT |
1832 | *poffset += bytes_read; |
1833 | } | |
1834 | } | |
a70307ee | 1835 | |
1da177e4 LT |
1836 | FreeXid(xid); |
1837 | return total_read; | |
1838 | } | |
1839 | ||
0b81c1c4 | 1840 | ssize_t cifs_user_readv(struct kiocb *iocb, const struct iovec *iov, |
a70307ee PS |
1841 | unsigned long nr_segs, loff_t pos) |
1842 | { | |
1843 | ssize_t read; | |
1844 | ||
1845 | read = cifs_iovec_read(iocb->ki_filp, iov, nr_segs, &pos); | |
1846 | if (read > 0) | |
1847 | iocb->ki_pos = pos; | |
1848 | ||
1849 | return read; | |
1850 | } | |
1851 | ||
1852 | ssize_t cifs_strict_readv(struct kiocb *iocb, const struct iovec *iov, | |
1853 | unsigned long nr_segs, loff_t pos) | |
1854 | { | |
1855 | struct inode *inode; | |
1856 | ||
1857 | inode = iocb->ki_filp->f_path.dentry->d_inode; | |
1858 | ||
1859 | if (CIFS_I(inode)->clientCanCacheRead) | |
1860 | return generic_file_aio_read(iocb, iov, nr_segs, pos); | |
1861 | ||
1862 | /* | |
1863 | * In strict cache mode we need to read from the server all the time | |
1864 | * if we don't have level II oplock because the server can delay mtime | |
1865 | * change - so we can't make a decision about inode invalidating. | |
1866 | * And we can also fail with pagereading if there are mandatory locks | |
1867 | * on pages affected by this read but not on the region from pos to | |
1868 | * pos+len-1. | |
1869 | */ | |
1870 | ||
1871 | return cifs_user_readv(iocb, iov, nr_segs, pos); | |
1872 | } | |
1da177e4 LT |
1873 | |
1874 | static ssize_t cifs_read(struct file *file, char *read_data, size_t read_size, | |
a70307ee | 1875 | loff_t *poffset) |
1da177e4 LT |
1876 | { |
1877 | int rc = -EACCES; | |
1878 | unsigned int bytes_read = 0; | |
1879 | unsigned int total_read; | |
1880 | unsigned int current_read_size; | |
5eba8ab3 | 1881 | unsigned int rsize; |
1da177e4 | 1882 | struct cifs_sb_info *cifs_sb; |
96daf2b0 | 1883 | struct cifs_tcon *pTcon; |
1da177e4 LT |
1884 | int xid; |
1885 | char *current_offset; | |
1886 | struct cifsFileInfo *open_file; | |
d4ffff1f | 1887 | struct cifs_io_parms io_parms; |
ec637e3f | 1888 | int buf_type = CIFS_NO_BUFFER; |
d4ffff1f | 1889 | __u32 pid; |
1da177e4 LT |
1890 | |
1891 | xid = GetXid(); | |
e6a00296 | 1892 | cifs_sb = CIFS_SB(file->f_path.dentry->d_sb); |
1da177e4 | 1893 | |
5eba8ab3 JL |
1894 | /* FIXME: set up handlers for larger reads and/or convert to async */ |
1895 | rsize = min_t(unsigned int, cifs_sb->rsize, CIFSMaxBufSize); | |
1896 | ||
1da177e4 | 1897 | if (file->private_data == NULL) { |
0f3bc09e | 1898 | rc = -EBADF; |
1da177e4 | 1899 | FreeXid(xid); |
0f3bc09e | 1900 | return rc; |
1da177e4 | 1901 | } |
c21dfb69 | 1902 | open_file = file->private_data; |
13cfb733 | 1903 | pTcon = tlink_tcon(open_file->tlink); |
1da177e4 | 1904 | |
d4ffff1f PS |
1905 | if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_RWPIDFORWARD) |
1906 | pid = open_file->pid; | |
1907 | else | |
1908 | pid = current->tgid; | |
1909 | ||
1da177e4 | 1910 | if ((file->f_flags & O_ACCMODE) == O_WRONLY) |
b6b38f70 | 1911 | cFYI(1, "attempting read on write only file instance"); |
1da177e4 | 1912 | |
fb8c4b14 | 1913 | for (total_read = 0, current_offset = read_data; |
1da177e4 LT |
1914 | read_size > total_read; |
1915 | total_read += bytes_read, current_offset += bytes_read) { | |
5eba8ab3 JL |
1916 | current_read_size = min_t(uint, read_size - total_read, rsize); |
1917 | ||
f9f5c817 SF |
1918 | /* For windows me and 9x we do not want to request more |
1919 | than it negotiated since it will refuse the read then */ | |
fb8c4b14 | 1920 | if ((pTcon->ses) && |
f9f5c817 | 1921 | !(pTcon->ses->capabilities & CAP_LARGE_FILES)) { |
7748dd6e | 1922 | current_read_size = min_t(uint, current_read_size, |
c974befa | 1923 | CIFSMaxBufSize); |
f9f5c817 | 1924 | } |
1da177e4 LT |
1925 | rc = -EAGAIN; |
1926 | while (rc == -EAGAIN) { | |
cdff08e7 | 1927 | if (open_file->invalidHandle) { |
15886177 | 1928 | rc = cifs_reopen_file(open_file, true); |
1da177e4 LT |
1929 | if (rc != 0) |
1930 | break; | |
1931 | } | |
d4ffff1f PS |
1932 | io_parms.netfid = open_file->netfid; |
1933 | io_parms.pid = pid; | |
1934 | io_parms.tcon = pTcon; | |
1935 | io_parms.offset = *poffset; | |
1936 | io_parms.length = current_read_size; | |
1937 | rc = CIFSSMBRead(xid, &io_parms, &bytes_read, | |
1938 | ¤t_offset, &buf_type); | |
1da177e4 LT |
1939 | } |
1940 | if (rc || (bytes_read == 0)) { | |
1941 | if (total_read) { | |
1942 | break; | |
1943 | } else { | |
1944 | FreeXid(xid); | |
1945 | return rc; | |
1946 | } | |
1947 | } else { | |
a4544347 | 1948 | cifs_stats_bytes_read(pTcon, total_read); |
1da177e4 LT |
1949 | *poffset += bytes_read; |
1950 | } | |
1951 | } | |
1952 | FreeXid(xid); | |
1953 | return total_read; | |
1954 | } | |
1955 | ||
ca83ce3d JL |
1956 | /* |
1957 | * If the page is mmap'ed into a process' page tables, then we need to make | |
1958 | * sure that it doesn't change while being written back. | |
1959 | */ | |
1960 | static int | |
1961 | cifs_page_mkwrite(struct vm_area_struct *vma, struct vm_fault *vmf) | |
1962 | { | |
1963 | struct page *page = vmf->page; | |
1964 | ||
1965 | lock_page(page); | |
1966 | return VM_FAULT_LOCKED; | |
1967 | } | |
1968 | ||
1969 | static struct vm_operations_struct cifs_file_vm_ops = { | |
1970 | .fault = filemap_fault, | |
1971 | .page_mkwrite = cifs_page_mkwrite, | |
1972 | }; | |
1973 | ||
7a6a19b1 PS |
1974 | int cifs_file_strict_mmap(struct file *file, struct vm_area_struct *vma) |
1975 | { | |
1976 | int rc, xid; | |
1977 | struct inode *inode = file->f_path.dentry->d_inode; | |
1978 | ||
1979 | xid = GetXid(); | |
1980 | ||
6feb9891 PS |
1981 | if (!CIFS_I(inode)->clientCanCacheRead) { |
1982 | rc = cifs_invalidate_mapping(inode); | |
1983 | if (rc) | |
1984 | return rc; | |
1985 | } | |
7a6a19b1 PS |
1986 | |
1987 | rc = generic_file_mmap(file, vma); | |
ca83ce3d JL |
1988 | if (rc == 0) |
1989 | vma->vm_ops = &cifs_file_vm_ops; | |
7a6a19b1 PS |
1990 | FreeXid(xid); |
1991 | return rc; | |
1992 | } | |
1993 | ||
1da177e4 LT |
1994 | int cifs_file_mmap(struct file *file, struct vm_area_struct *vma) |
1995 | { | |
1da177e4 LT |
1996 | int rc, xid; |
1997 | ||
1998 | xid = GetXid(); | |
abab095d | 1999 | rc = cifs_revalidate_file(file); |
1da177e4 | 2000 | if (rc) { |
b6b38f70 | 2001 | cFYI(1, "Validation prior to mmap failed, error=%d", rc); |
1da177e4 LT |
2002 | FreeXid(xid); |
2003 | return rc; | |
2004 | } | |
2005 | rc = generic_file_mmap(file, vma); | |
ca83ce3d JL |
2006 | if (rc == 0) |
2007 | vma->vm_ops = &cifs_file_vm_ops; | |
1da177e4 LT |
2008 | FreeXid(xid); |
2009 | return rc; | |
2010 | } | |
2011 | ||
1da177e4 LT |
2012 | static int cifs_readpages(struct file *file, struct address_space *mapping, |
2013 | struct list_head *page_list, unsigned num_pages) | |
2014 | { | |
690c5e31 JL |
2015 | int rc; |
2016 | struct list_head tmplist; | |
2017 | struct cifsFileInfo *open_file = file->private_data; | |
2018 | struct cifs_sb_info *cifs_sb = CIFS_SB(file->f_path.dentry->d_sb); | |
2019 | unsigned int rsize = cifs_sb->rsize; | |
2020 | pid_t pid; | |
1da177e4 | 2021 | |
690c5e31 JL |
2022 | /* |
2023 | * Give up immediately if rsize is too small to read an entire page. | |
2024 | * The VFS will fall back to readpage. We should never reach this | |
2025 | * point however since we set ra_pages to 0 when the rsize is smaller | |
2026 | * than a cache page. | |
2027 | */ | |
2028 | if (unlikely(rsize < PAGE_CACHE_SIZE)) | |
2029 | return 0; | |
bfa0d75a | 2030 | |
56698236 SJ |
2031 | /* |
2032 | * Reads as many pages as possible from fscache. Returns -ENOBUFS | |
2033 | * immediately if the cookie is negative | |
2034 | */ | |
2035 | rc = cifs_readpages_from_fscache(mapping->host, mapping, page_list, | |
2036 | &num_pages); | |
2037 | if (rc == 0) | |
690c5e31 | 2038 | return rc; |
56698236 | 2039 | |
d4ffff1f PS |
2040 | if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_RWPIDFORWARD) |
2041 | pid = open_file->pid; | |
2042 | else | |
2043 | pid = current->tgid; | |
2044 | ||
690c5e31 JL |
2045 | rc = 0; |
2046 | INIT_LIST_HEAD(&tmplist); | |
1da177e4 | 2047 | |
690c5e31 JL |
2048 | cFYI(1, "%s: file=%p mapping=%p num_pages=%u", __func__, file, |
2049 | mapping, num_pages); | |
2050 | ||
2051 | /* | |
2052 | * Start with the page at end of list and move it to private | |
2053 | * list. Do the same with any following pages until we hit | |
2054 | * the rsize limit, hit an index discontinuity, or run out of | |
2055 | * pages. Issue the async read and then start the loop again | |
2056 | * until the list is empty. | |
2057 | * | |
2058 | * Note that list order is important. The page_list is in | |
2059 | * the order of declining indexes. When we put the pages in | |
2060 | * the rdata->pages, then we want them in increasing order. | |
2061 | */ | |
2062 | while (!list_empty(page_list)) { | |
2063 | unsigned int bytes = PAGE_CACHE_SIZE; | |
2064 | unsigned int expected_index; | |
2065 | unsigned int nr_pages = 1; | |
2066 | loff_t offset; | |
2067 | struct page *page, *tpage; | |
2068 | struct cifs_readdata *rdata; | |
1da177e4 LT |
2069 | |
2070 | page = list_entry(page_list->prev, struct page, lru); | |
690c5e31 JL |
2071 | |
2072 | /* | |
2073 | * Lock the page and put it in the cache. Since no one else | |
2074 | * should have access to this page, we're safe to simply set | |
2075 | * PG_locked without checking it first. | |
2076 | */ | |
2077 | __set_page_locked(page); | |
2078 | rc = add_to_page_cache_locked(page, mapping, | |
2079 | page->index, GFP_KERNEL); | |
2080 | ||
2081 | /* give up if we can't stick it in the cache */ | |
2082 | if (rc) { | |
2083 | __clear_page_locked(page); | |
2084 | break; | |
2085 | } | |
2086 | ||
2087 | /* move first page to the tmplist */ | |
1da177e4 | 2088 | offset = (loff_t)page->index << PAGE_CACHE_SHIFT; |
690c5e31 | 2089 | list_move_tail(&page->lru, &tmplist); |
1da177e4 | 2090 | |
690c5e31 JL |
2091 | /* now try and add more pages onto the request */ |
2092 | expected_index = page->index + 1; | |
2093 | list_for_each_entry_safe_reverse(page, tpage, page_list, lru) { | |
2094 | /* discontinuity ? */ | |
2095 | if (page->index != expected_index) | |
fb8c4b14 | 2096 | break; |
690c5e31 JL |
2097 | |
2098 | /* would this page push the read over the rsize? */ | |
2099 | if (bytes + PAGE_CACHE_SIZE > rsize) | |
2100 | break; | |
2101 | ||
2102 | __set_page_locked(page); | |
2103 | if (add_to_page_cache_locked(page, mapping, | |
2104 | page->index, GFP_KERNEL)) { | |
2105 | __clear_page_locked(page); | |
2106 | break; | |
2107 | } | |
2108 | list_move_tail(&page->lru, &tmplist); | |
2109 | bytes += PAGE_CACHE_SIZE; | |
2110 | expected_index++; | |
2111 | nr_pages++; | |
1da177e4 | 2112 | } |
690c5e31 JL |
2113 | |
2114 | rdata = cifs_readdata_alloc(nr_pages); | |
2115 | if (!rdata) { | |
2116 | /* best to give up if we're out of mem */ | |
2117 | list_for_each_entry_safe(page, tpage, &tmplist, lru) { | |
2118 | list_del(&page->lru); | |
2119 | lru_cache_add_file(page); | |
2120 | unlock_page(page); | |
2121 | page_cache_release(page); | |
2122 | } | |
2123 | rc = -ENOMEM; | |
2124 | break; | |
2125 | } | |
2126 | ||
2127 | spin_lock(&cifs_file_list_lock); | |
2128 | cifsFileInfo_get(open_file); | |
2129 | spin_unlock(&cifs_file_list_lock); | |
2130 | rdata->cfile = open_file; | |
2131 | rdata->mapping = mapping; | |
2132 | rdata->offset = offset; | |
2133 | rdata->bytes = bytes; | |
2134 | rdata->pid = pid; | |
2135 | list_splice_init(&tmplist, &rdata->pages); | |
2136 | ||
2137 | do { | |
cdff08e7 | 2138 | if (open_file->invalidHandle) { |
15886177 | 2139 | rc = cifs_reopen_file(open_file, true); |
1da177e4 | 2140 | if (rc != 0) |
690c5e31 | 2141 | continue; |
1da177e4 | 2142 | } |
690c5e31 JL |
2143 | rc = cifs_async_readv(rdata); |
2144 | } while (rc == -EAGAIN); | |
1da177e4 | 2145 | |
690c5e31 JL |
2146 | if (rc != 0) { |
2147 | list_for_each_entry_safe(page, tpage, &rdata->pages, | |
2148 | lru) { | |
2149 | list_del(&page->lru); | |
2150 | lru_cache_add_file(page); | |
2151 | unlock_page(page); | |
2152 | page_cache_release(page); | |
1da177e4 | 2153 | } |
690c5e31 | 2154 | cifs_readdata_free(rdata); |
1da177e4 LT |
2155 | break; |
2156 | } | |
1da177e4 LT |
2157 | } |
2158 | ||
1da177e4 LT |
2159 | return rc; |
2160 | } | |
2161 | ||
2162 | static int cifs_readpage_worker(struct file *file, struct page *page, | |
2163 | loff_t *poffset) | |
2164 | { | |
2165 | char *read_data; | |
2166 | int rc; | |
2167 | ||
56698236 SJ |
2168 | /* Is the page cached? */ |
2169 | rc = cifs_readpage_from_fscache(file->f_path.dentry->d_inode, page); | |
2170 | if (rc == 0) | |
2171 | goto read_complete; | |
2172 | ||
1da177e4 LT |
2173 | page_cache_get(page); |
2174 | read_data = kmap(page); | |
2175 | /* for reads over a certain size could initiate async read ahead */ | |
fb8c4b14 | 2176 | |
1da177e4 | 2177 | rc = cifs_read(file, read_data, PAGE_CACHE_SIZE, poffset); |
fb8c4b14 | 2178 | |
1da177e4 LT |
2179 | if (rc < 0) |
2180 | goto io_error; | |
2181 | else | |
b6b38f70 | 2182 | cFYI(1, "Bytes read %d", rc); |
fb8c4b14 | 2183 | |
e6a00296 JJS |
2184 | file->f_path.dentry->d_inode->i_atime = |
2185 | current_fs_time(file->f_path.dentry->d_inode->i_sb); | |
fb8c4b14 | 2186 | |
1da177e4 LT |
2187 | if (PAGE_CACHE_SIZE > rc) |
2188 | memset(read_data + rc, 0, PAGE_CACHE_SIZE - rc); | |
2189 | ||
2190 | flush_dcache_page(page); | |
2191 | SetPageUptodate(page); | |
9dc06558 SJ |
2192 | |
2193 | /* send this page to the cache */ | |
2194 | cifs_readpage_to_fscache(file->f_path.dentry->d_inode, page); | |
2195 | ||
1da177e4 | 2196 | rc = 0; |
fb8c4b14 | 2197 | |
1da177e4 | 2198 | io_error: |
fb8c4b14 | 2199 | kunmap(page); |
1da177e4 | 2200 | page_cache_release(page); |
56698236 SJ |
2201 | |
2202 | read_complete: | |
1da177e4 LT |
2203 | return rc; |
2204 | } | |
2205 | ||
2206 | static int cifs_readpage(struct file *file, struct page *page) | |
2207 | { | |
2208 | loff_t offset = (loff_t)page->index << PAGE_CACHE_SHIFT; | |
2209 | int rc = -EACCES; | |
2210 | int xid; | |
2211 | ||
2212 | xid = GetXid(); | |
2213 | ||
2214 | if (file->private_data == NULL) { | |
0f3bc09e | 2215 | rc = -EBADF; |
1da177e4 | 2216 | FreeXid(xid); |
0f3bc09e | 2217 | return rc; |
1da177e4 LT |
2218 | } |
2219 | ||
b6b38f70 JP |
2220 | cFYI(1, "readpage %p at offset %d 0x%x\n", |
2221 | page, (int)offset, (int)offset); | |
1da177e4 LT |
2222 | |
2223 | rc = cifs_readpage_worker(file, page, &offset); | |
2224 | ||
2225 | unlock_page(page); | |
2226 | ||
2227 | FreeXid(xid); | |
2228 | return rc; | |
2229 | } | |
2230 | ||
a403a0a3 SF |
2231 | static int is_inode_writable(struct cifsInodeInfo *cifs_inode) |
2232 | { | |
2233 | struct cifsFileInfo *open_file; | |
2234 | ||
4477288a | 2235 | spin_lock(&cifs_file_list_lock); |
a403a0a3 | 2236 | list_for_each_entry(open_file, &cifs_inode->openFileList, flist) { |
2e396b83 | 2237 | if (OPEN_FMODE(open_file->f_flags) & FMODE_WRITE) { |
4477288a | 2238 | spin_unlock(&cifs_file_list_lock); |
a403a0a3 SF |
2239 | return 1; |
2240 | } | |
2241 | } | |
4477288a | 2242 | spin_unlock(&cifs_file_list_lock); |
a403a0a3 SF |
2243 | return 0; |
2244 | } | |
2245 | ||
1da177e4 LT |
2246 | /* We do not want to update the file size from server for inodes |
2247 | open for write - to avoid races with writepage extending | |
2248 | the file - in the future we could consider allowing | |
fb8c4b14 | 2249 | refreshing the inode only on increases in the file size |
1da177e4 LT |
2250 | but this is tricky to do without racing with writebehind |
2251 | page caching in the current Linux kernel design */ | |
4b18f2a9 | 2252 | bool is_size_safe_to_change(struct cifsInodeInfo *cifsInode, __u64 end_of_file) |
1da177e4 | 2253 | { |
a403a0a3 | 2254 | if (!cifsInode) |
4b18f2a9 | 2255 | return true; |
50c2f753 | 2256 | |
a403a0a3 SF |
2257 | if (is_inode_writable(cifsInode)) { |
2258 | /* This inode is open for write at least once */ | |
c32a0b68 SF |
2259 | struct cifs_sb_info *cifs_sb; |
2260 | ||
c32a0b68 | 2261 | cifs_sb = CIFS_SB(cifsInode->vfs_inode.i_sb); |
ad7a2926 | 2262 | if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DIRECT_IO) { |
fb8c4b14 | 2263 | /* since no page cache to corrupt on directio |
c32a0b68 | 2264 | we can change size safely */ |
4b18f2a9 | 2265 | return true; |
c32a0b68 SF |
2266 | } |
2267 | ||
fb8c4b14 | 2268 | if (i_size_read(&cifsInode->vfs_inode) < end_of_file) |
4b18f2a9 | 2269 | return true; |
7ba52631 | 2270 | |
4b18f2a9 | 2271 | return false; |
23e7dd7d | 2272 | } else |
4b18f2a9 | 2273 | return true; |
1da177e4 LT |
2274 | } |
2275 | ||
d9414774 NP |
2276 | static int cifs_write_begin(struct file *file, struct address_space *mapping, |
2277 | loff_t pos, unsigned len, unsigned flags, | |
2278 | struct page **pagep, void **fsdata) | |
1da177e4 | 2279 | { |
d9414774 NP |
2280 | pgoff_t index = pos >> PAGE_CACHE_SHIFT; |
2281 | loff_t offset = pos & (PAGE_CACHE_SIZE - 1); | |
a98ee8c1 JL |
2282 | loff_t page_start = pos & PAGE_MASK; |
2283 | loff_t i_size; | |
2284 | struct page *page; | |
2285 | int rc = 0; | |
d9414774 | 2286 | |
b6b38f70 | 2287 | cFYI(1, "write_begin from %lld len %d", (long long)pos, len); |
d9414774 | 2288 | |
54566b2c | 2289 | page = grab_cache_page_write_begin(mapping, index, flags); |
a98ee8c1 JL |
2290 | if (!page) { |
2291 | rc = -ENOMEM; | |
2292 | goto out; | |
2293 | } | |
8a236264 | 2294 | |
a98ee8c1 JL |
2295 | if (PageUptodate(page)) |
2296 | goto out; | |
8a236264 | 2297 | |
a98ee8c1 JL |
2298 | /* |
2299 | * If we write a full page it will be up to date, no need to read from | |
2300 | * the server. If the write is short, we'll end up doing a sync write | |
2301 | * instead. | |
2302 | */ | |
2303 | if (len == PAGE_CACHE_SIZE) | |
2304 | goto out; | |
8a236264 | 2305 | |
a98ee8c1 JL |
2306 | /* |
2307 | * optimize away the read when we have an oplock, and we're not | |
2308 | * expecting to use any of the data we'd be reading in. That | |
2309 | * is, when the page lies beyond the EOF, or straddles the EOF | |
2310 | * and the write will cover all of the existing data. | |
2311 | */ | |
2312 | if (CIFS_I(mapping->host)->clientCanCacheRead) { | |
2313 | i_size = i_size_read(mapping->host); | |
2314 | if (page_start >= i_size || | |
2315 | (offset == 0 && (pos + len) >= i_size)) { | |
2316 | zero_user_segments(page, 0, offset, | |
2317 | offset + len, | |
2318 | PAGE_CACHE_SIZE); | |
2319 | /* | |
2320 | * PageChecked means that the parts of the page | |
2321 | * to which we're not writing are considered up | |
2322 | * to date. Once the data is copied to the | |
2323 | * page, it can be set uptodate. | |
2324 | */ | |
2325 | SetPageChecked(page); | |
2326 | goto out; | |
2327 | } | |
2328 | } | |
d9414774 | 2329 | |
a98ee8c1 JL |
2330 | if ((file->f_flags & O_ACCMODE) != O_WRONLY) { |
2331 | /* | |
2332 | * might as well read a page, it is fast enough. If we get | |
2333 | * an error, we don't need to return it. cifs_write_end will | |
2334 | * do a sync write instead since PG_uptodate isn't set. | |
2335 | */ | |
2336 | cifs_readpage_worker(file, page, &page_start); | |
8a236264 SF |
2337 | } else { |
2338 | /* we could try using another file handle if there is one - | |
2339 | but how would we lock it to prevent close of that handle | |
2340 | racing with this read? In any case | |
d9414774 | 2341 | this will be written out by write_end so is fine */ |
1da177e4 | 2342 | } |
a98ee8c1 JL |
2343 | out: |
2344 | *pagep = page; | |
2345 | return rc; | |
1da177e4 LT |
2346 | } |
2347 | ||
85f2d6b4 SJ |
2348 | static int cifs_release_page(struct page *page, gfp_t gfp) |
2349 | { | |
2350 | if (PagePrivate(page)) | |
2351 | return 0; | |
2352 | ||
2353 | return cifs_fscache_release_page(page, gfp); | |
2354 | } | |
2355 | ||
2356 | static void cifs_invalidate_page(struct page *page, unsigned long offset) | |
2357 | { | |
2358 | struct cifsInodeInfo *cifsi = CIFS_I(page->mapping->host); | |
2359 | ||
2360 | if (offset == 0) | |
2361 | cifs_fscache_invalidate_page(page, &cifsi->vfs_inode); | |
2362 | } | |
2363 | ||
9ad1506b PS |
2364 | static int cifs_launder_page(struct page *page) |
2365 | { | |
2366 | int rc = 0; | |
2367 | loff_t range_start = page_offset(page); | |
2368 | loff_t range_end = range_start + (loff_t)(PAGE_CACHE_SIZE - 1); | |
2369 | struct writeback_control wbc = { | |
2370 | .sync_mode = WB_SYNC_ALL, | |
2371 | .nr_to_write = 0, | |
2372 | .range_start = range_start, | |
2373 | .range_end = range_end, | |
2374 | }; | |
2375 | ||
2376 | cFYI(1, "Launder page: %p", page); | |
2377 | ||
2378 | if (clear_page_dirty_for_io(page)) | |
2379 | rc = cifs_writepage_locked(page, &wbc); | |
2380 | ||
2381 | cifs_fscache_invalidate_page(page, page->mapping->host); | |
2382 | return rc; | |
2383 | } | |
2384 | ||
9b646972 | 2385 | void cifs_oplock_break(struct work_struct *work) |
3bc303c2 JL |
2386 | { |
2387 | struct cifsFileInfo *cfile = container_of(work, struct cifsFileInfo, | |
2388 | oplock_break); | |
a5e18bc3 | 2389 | struct inode *inode = cfile->dentry->d_inode; |
3bc303c2 | 2390 | struct cifsInodeInfo *cinode = CIFS_I(inode); |
eb4b756b | 2391 | int rc = 0; |
3bc303c2 JL |
2392 | |
2393 | if (inode && S_ISREG(inode->i_mode)) { | |
d54ff732 | 2394 | if (cinode->clientCanCacheRead) |
8737c930 | 2395 | break_lease(inode, O_RDONLY); |
d54ff732 | 2396 | else |
8737c930 | 2397 | break_lease(inode, O_WRONLY); |
3bc303c2 JL |
2398 | rc = filemap_fdatawrite(inode->i_mapping); |
2399 | if (cinode->clientCanCacheRead == 0) { | |
eb4b756b JL |
2400 | rc = filemap_fdatawait(inode->i_mapping); |
2401 | mapping_set_error(inode->i_mapping, rc); | |
3bc303c2 JL |
2402 | invalidate_remote_inode(inode); |
2403 | } | |
b6b38f70 | 2404 | cFYI(1, "Oplock flush inode %p rc %d", inode, rc); |
3bc303c2 JL |
2405 | } |
2406 | ||
2407 | /* | |
2408 | * releasing stale oplock after recent reconnect of smb session using | |
2409 | * a now incorrect file handle is not a data integrity issue but do | |
2410 | * not bother sending an oplock release if session to server still is | |
2411 | * disconnected since oplock already released by the server | |
2412 | */ | |
cdff08e7 | 2413 | if (!cfile->oplock_break_cancelled) { |
03776f45 PS |
2414 | rc = CIFSSMBLock(0, tlink_tcon(cfile->tlink), cfile->netfid, |
2415 | current->tgid, 0, 0, 0, 0, | |
2416 | LOCKING_ANDX_OPLOCK_RELEASE, false, | |
12fed00d | 2417 | cinode->clientCanCacheRead ? 1 : 0); |
b6b38f70 | 2418 | cFYI(1, "Oplock release rc = %d", rc); |
3bc303c2 | 2419 | } |
3bc303c2 JL |
2420 | } |
2421 | ||
f5e54d6e | 2422 | const struct address_space_operations cifs_addr_ops = { |
1da177e4 LT |
2423 | .readpage = cifs_readpage, |
2424 | .readpages = cifs_readpages, | |
2425 | .writepage = cifs_writepage, | |
37c0eb46 | 2426 | .writepages = cifs_writepages, |
d9414774 NP |
2427 | .write_begin = cifs_write_begin, |
2428 | .write_end = cifs_write_end, | |
1da177e4 | 2429 | .set_page_dirty = __set_page_dirty_nobuffers, |
85f2d6b4 SJ |
2430 | .releasepage = cifs_release_page, |
2431 | .invalidatepage = cifs_invalidate_page, | |
9ad1506b | 2432 | .launder_page = cifs_launder_page, |
1da177e4 | 2433 | }; |
273d81d6 DK |
2434 | |
2435 | /* | |
2436 | * cifs_readpages requires the server to support a buffer large enough to | |
2437 | * contain the header plus one complete page of data. Otherwise, we need | |
2438 | * to leave cifs_readpages out of the address space operations. | |
2439 | */ | |
f5e54d6e | 2440 | const struct address_space_operations cifs_addr_ops_smallbuf = { |
273d81d6 DK |
2441 | .readpage = cifs_readpage, |
2442 | .writepage = cifs_writepage, | |
2443 | .writepages = cifs_writepages, | |
d9414774 NP |
2444 | .write_begin = cifs_write_begin, |
2445 | .write_end = cifs_write_end, | |
273d81d6 | 2446 | .set_page_dirty = __set_page_dirty_nobuffers, |
85f2d6b4 SJ |
2447 | .releasepage = cifs_release_page, |
2448 | .invalidatepage = cifs_invalidate_page, | |
9ad1506b | 2449 | .launder_page = cifs_launder_page, |
273d81d6 | 2450 | }; |