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Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * fs/cifs/file.c | |
3 | * | |
4 | * vfs operations that deal with files | |
fb8c4b14 | 5 | * |
f19159dc | 6 | * Copyright (C) International Business Machines Corp., 2002,2010 |
1da177e4 | 7 | * Author(s): Steve French (sfrench@us.ibm.com) |
7ee1af76 | 8 | * Jeremy Allison (jra@samba.org) |
1da177e4 LT |
9 | * |
10 | * This library is free software; you can redistribute it and/or modify | |
11 | * it under the terms of the GNU Lesser General Public License as published | |
12 | * by the Free Software Foundation; either version 2.1 of the License, or | |
13 | * (at your option) any later version. | |
14 | * | |
15 | * This library is distributed in the hope that it will be useful, | |
16 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
17 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See | |
18 | * the GNU Lesser General Public License for more details. | |
19 | * | |
20 | * You should have received a copy of the GNU Lesser General Public License | |
21 | * along with this library; if not, write to the Free Software | |
22 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA | |
23 | */ | |
24 | #include <linux/fs.h> | |
37c0eb46 | 25 | #include <linux/backing-dev.h> |
1da177e4 LT |
26 | #include <linux/stat.h> |
27 | #include <linux/fcntl.h> | |
28 | #include <linux/pagemap.h> | |
29 | #include <linux/pagevec.h> | |
37c0eb46 | 30 | #include <linux/writeback.h> |
6f88cc2e | 31 | #include <linux/task_io_accounting_ops.h> |
23e7dd7d | 32 | #include <linux/delay.h> |
3bc303c2 | 33 | #include <linux/mount.h> |
5a0e3ad6 | 34 | #include <linux/slab.h> |
1da177e4 LT |
35 | #include <asm/div64.h> |
36 | #include "cifsfs.h" | |
37 | #include "cifspdu.h" | |
38 | #include "cifsglob.h" | |
39 | #include "cifsproto.h" | |
40 | #include "cifs_unicode.h" | |
41 | #include "cifs_debug.h" | |
42 | #include "cifs_fs_sb.h" | |
43 | ||
1da177e4 LT |
44 | static inline int cifs_convert_flags(unsigned int flags) |
45 | { | |
46 | if ((flags & O_ACCMODE) == O_RDONLY) | |
47 | return GENERIC_READ; | |
48 | else if ((flags & O_ACCMODE) == O_WRONLY) | |
49 | return GENERIC_WRITE; | |
50 | else if ((flags & O_ACCMODE) == O_RDWR) { | |
51 | /* GENERIC_ALL is too much permission to request | |
52 | can cause unnecessary access denied on create */ | |
53 | /* return GENERIC_ALL; */ | |
54 | return (GENERIC_READ | GENERIC_WRITE); | |
55 | } | |
56 | ||
e10f7b55 JL |
57 | return (READ_CONTROL | FILE_WRITE_ATTRIBUTES | FILE_READ_ATTRIBUTES | |
58 | FILE_WRITE_EA | FILE_APPEND_DATA | FILE_WRITE_DATA | | |
59 | FILE_READ_DATA); | |
7fc8f4e9 | 60 | } |
e10f7b55 | 61 | |
7fc8f4e9 SF |
62 | static inline fmode_t cifs_posix_convert_flags(unsigned int flags) |
63 | { | |
64 | fmode_t posix_flags = 0; | |
e10f7b55 | 65 | |
7fc8f4e9 SF |
66 | if ((flags & O_ACCMODE) == O_RDONLY) |
67 | posix_flags = FMODE_READ; | |
68 | else if ((flags & O_ACCMODE) == O_WRONLY) | |
69 | posix_flags = FMODE_WRITE; | |
70 | else if ((flags & O_ACCMODE) == O_RDWR) { | |
71 | /* GENERIC_ALL is too much permission to request | |
72 | can cause unnecessary access denied on create */ | |
73 | /* return GENERIC_ALL; */ | |
74 | posix_flags = FMODE_READ | FMODE_WRITE; | |
75 | } | |
76 | /* can not map O_CREAT or O_EXCL or O_TRUNC flags when | |
77 | reopening a file. They had their effect on the original open */ | |
78 | if (flags & O_APPEND) | |
79 | posix_flags |= (fmode_t)O_APPEND; | |
6b2f3d1f CH |
80 | if (flags & O_DSYNC) |
81 | posix_flags |= (fmode_t)O_DSYNC; | |
82 | if (flags & __O_SYNC) | |
83 | posix_flags |= (fmode_t)__O_SYNC; | |
7fc8f4e9 SF |
84 | if (flags & O_DIRECTORY) |
85 | posix_flags |= (fmode_t)O_DIRECTORY; | |
86 | if (flags & O_NOFOLLOW) | |
87 | posix_flags |= (fmode_t)O_NOFOLLOW; | |
88 | if (flags & O_DIRECT) | |
89 | posix_flags |= (fmode_t)O_DIRECT; | |
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 | ||
276a74a4 | 108 | /* all arguments to this function must be checked for validity in caller */ |
590a3fe0 JL |
109 | static inline int |
110 | cifs_posix_open_inode_helper(struct inode *inode, struct file *file, | |
51c81764 | 111 | struct cifsInodeInfo *pCifsInode, __u32 oplock, |
590a3fe0 | 112 | u16 netfid) |
276a74a4 | 113 | { |
276a74a4 | 114 | |
276a74a4 | 115 | write_lock(&GlobalSMBSeslock); |
276a74a4 SF |
116 | |
117 | pCifsInode = CIFS_I(file->f_path.dentry->d_inode); | |
118 | if (pCifsInode == NULL) { | |
119 | write_unlock(&GlobalSMBSeslock); | |
120 | return -EINVAL; | |
121 | } | |
122 | ||
276a74a4 SF |
123 | if (pCifsInode->clientCanCacheRead) { |
124 | /* we have the inode open somewhere else | |
125 | no need to discard cache data */ | |
126 | goto psx_client_can_cache; | |
127 | } | |
128 | ||
129 | /* BB FIXME need to fix this check to move it earlier into posix_open | |
130 | BB fIX following section BB FIXME */ | |
131 | ||
132 | /* if not oplocked, invalidate inode pages if mtime or file | |
133 | size changed */ | |
134 | /* temp = cifs_NTtimeToUnix(le64_to_cpu(buf->LastWriteTime)); | |
135 | if (timespec_equal(&file->f_path.dentry->d_inode->i_mtime, &temp) && | |
136 | (file->f_path.dentry->d_inode->i_size == | |
137 | (loff_t)le64_to_cpu(buf->EndOfFile))) { | |
b6b38f70 | 138 | cFYI(1, "inode unchanged on server"); |
276a74a4 SF |
139 | } else { |
140 | if (file->f_path.dentry->d_inode->i_mapping) { | |
141 | rc = filemap_write_and_wait(file->f_path.dentry->d_inode->i_mapping); | |
142 | if (rc != 0) | |
143 | CIFS_I(file->f_path.dentry->d_inode)->write_behind_rc = rc; | |
144 | } | |
b6b38f70 JP |
145 | cFYI(1, "invalidating remote inode since open detected it " |
146 | "changed"); | |
276a74a4 SF |
147 | invalidate_remote_inode(file->f_path.dentry->d_inode); |
148 | } */ | |
149 | ||
150 | psx_client_can_cache: | |
151 | if ((oplock & 0xF) == OPLOCK_EXCLUSIVE) { | |
152 | pCifsInode->clientCanCacheAll = true; | |
153 | pCifsInode->clientCanCacheRead = true; | |
b6b38f70 JP |
154 | cFYI(1, "Exclusive Oplock granted on inode %p", |
155 | file->f_path.dentry->d_inode); | |
276a74a4 SF |
156 | } else if ((oplock & 0xF) == OPLOCK_READ) |
157 | pCifsInode->clientCanCacheRead = true; | |
158 | ||
159 | /* will have to change the unlock if we reenable the | |
160 | filemap_fdatawrite (which does not seem necessary */ | |
161 | write_unlock(&GlobalSMBSeslock); | |
162 | return 0; | |
163 | } | |
164 | ||
1da177e4 | 165 | /* all arguments to this function must be checked for validity in caller */ |
db460242 | 166 | static inline int cifs_open_inode_helper(struct inode *inode, |
1da177e4 LT |
167 | struct cifsTconInfo *pTcon, int *oplock, FILE_ALL_INFO *buf, |
168 | char *full_path, int xid) | |
169 | { | |
db460242 | 170 | struct cifsInodeInfo *pCifsInode = CIFS_I(inode); |
1da177e4 LT |
171 | struct timespec temp; |
172 | int rc; | |
173 | ||
1da177e4 LT |
174 | if (pCifsInode->clientCanCacheRead) { |
175 | /* we have the inode open somewhere else | |
176 | no need to discard cache data */ | |
177 | goto client_can_cache; | |
178 | } | |
179 | ||
180 | /* BB need same check in cifs_create too? */ | |
181 | /* if not oplocked, invalidate inode pages if mtime or file | |
182 | size changed */ | |
07119a4d | 183 | temp = cifs_NTtimeToUnix(buf->LastWriteTime); |
db460242 JL |
184 | if (timespec_equal(&inode->i_mtime, &temp) && |
185 | (inode->i_size == | |
1da177e4 | 186 | (loff_t)le64_to_cpu(buf->EndOfFile))) { |
b6b38f70 | 187 | cFYI(1, "inode unchanged on server"); |
1da177e4 | 188 | } else { |
db460242 | 189 | if (inode->i_mapping) { |
ff215713 SF |
190 | /* BB no need to lock inode until after invalidate |
191 | since namei code should already have it locked? */ | |
db460242 | 192 | rc = filemap_write_and_wait(inode->i_mapping); |
cea21805 | 193 | if (rc != 0) |
db460242 | 194 | pCifsInode->write_behind_rc = rc; |
1da177e4 | 195 | } |
b6b38f70 JP |
196 | cFYI(1, "invalidating remote inode since open detected it " |
197 | "changed"); | |
db460242 | 198 | invalidate_remote_inode(inode); |
1da177e4 LT |
199 | } |
200 | ||
201 | client_can_cache: | |
c18c842b | 202 | if (pTcon->unix_ext) |
db460242 JL |
203 | rc = cifs_get_inode_info_unix(&inode, full_path, inode->i_sb, |
204 | xid); | |
1da177e4 | 205 | else |
db460242 JL |
206 | rc = cifs_get_inode_info(&inode, full_path, buf, inode->i_sb, |
207 | xid, NULL); | |
1da177e4 LT |
208 | |
209 | if ((*oplock & 0xF) == OPLOCK_EXCLUSIVE) { | |
4b18f2a9 SF |
210 | pCifsInode->clientCanCacheAll = true; |
211 | pCifsInode->clientCanCacheRead = true; | |
db460242 | 212 | cFYI(1, "Exclusive Oplock granted on inode %p", inode); |
1da177e4 | 213 | } else if ((*oplock & 0xF) == OPLOCK_READ) |
4b18f2a9 | 214 | pCifsInode->clientCanCacheRead = true; |
1da177e4 LT |
215 | |
216 | return rc; | |
217 | } | |
218 | ||
219 | int cifs_open(struct inode *inode, struct file *file) | |
220 | { | |
221 | int rc = -EACCES; | |
590a3fe0 JL |
222 | int xid; |
223 | __u32 oplock; | |
1da177e4 | 224 | struct cifs_sb_info *cifs_sb; |
276a74a4 | 225 | struct cifsTconInfo *tcon; |
6ca9f3ba | 226 | struct cifsFileInfo *pCifsFile = NULL; |
1da177e4 | 227 | struct cifsInodeInfo *pCifsInode; |
1da177e4 LT |
228 | char *full_path = NULL; |
229 | int desiredAccess; | |
230 | int disposition; | |
231 | __u16 netfid; | |
232 | FILE_ALL_INFO *buf = NULL; | |
233 | ||
234 | xid = GetXid(); | |
235 | ||
236 | cifs_sb = CIFS_SB(inode->i_sb); | |
276a74a4 | 237 | tcon = cifs_sb->tcon; |
1da177e4 | 238 | |
a6ce4932 | 239 | pCifsInode = CIFS_I(file->f_path.dentry->d_inode); |
1da177e4 | 240 | |
e6a00296 | 241 | full_path = build_path_from_dentry(file->f_path.dentry); |
1da177e4 | 242 | if (full_path == NULL) { |
0f3bc09e | 243 | rc = -ENOMEM; |
1da177e4 | 244 | FreeXid(xid); |
0f3bc09e | 245 | return rc; |
1da177e4 LT |
246 | } |
247 | ||
b6b38f70 JP |
248 | cFYI(1, "inode = 0x%p file flags are 0x%x for %s", |
249 | inode, file->f_flags, full_path); | |
276a74a4 SF |
250 | |
251 | if (oplockEnabled) | |
252 | oplock = REQ_OPLOCK; | |
253 | else | |
254 | oplock = 0; | |
255 | ||
64cc2c63 SF |
256 | if (!tcon->broken_posix_open && tcon->unix_ext && |
257 | (tcon->ses->capabilities & CAP_UNIX) && | |
276a74a4 SF |
258 | (CIFS_UNIX_POSIX_PATH_OPS_CAP & |
259 | le64_to_cpu(tcon->fsUnixInfo.Capability))) { | |
260 | int oflags = (int) cifs_posix_convert_flags(file->f_flags); | |
fa588e0c | 261 | oflags |= SMB_O_CREAT; |
276a74a4 | 262 | /* can not refresh inode info since size could be stale */ |
2422f676 | 263 | rc = cifs_posix_open(full_path, &inode, inode->i_sb, |
fa588e0c SF |
264 | cifs_sb->mnt_file_mode /* ignored */, |
265 | oflags, &oplock, &netfid, xid); | |
276a74a4 | 266 | if (rc == 0) { |
b6b38f70 | 267 | cFYI(1, "posix open succeeded"); |
276a74a4 SF |
268 | /* no need for special case handling of setting mode |
269 | on read only files needed here */ | |
270 | ||
47c78b7f JL |
271 | rc = cifs_posix_open_inode_helper(inode, file, |
272 | pCifsInode, oplock, netfid); | |
273 | if (rc != 0) { | |
274 | CIFSSMBClose(xid, tcon, netfid); | |
275 | goto out; | |
276 | } | |
277 | ||
2422f676 JL |
278 | pCifsFile = cifs_new_fileinfo(inode, netfid, file, |
279 | file->f_path.mnt, | |
280 | oflags); | |
281 | if (pCifsFile == NULL) { | |
282 | CIFSSMBClose(xid, tcon, netfid); | |
283 | rc = -ENOMEM; | |
2422f676 | 284 | } |
276a74a4 | 285 | goto out; |
64cc2c63 SF |
286 | } else if ((rc == -EINVAL) || (rc == -EOPNOTSUPP)) { |
287 | if (tcon->ses->serverNOS) | |
b6b38f70 | 288 | cERROR(1, "server %s of type %s returned" |
64cc2c63 SF |
289 | " unexpected error on SMB posix open" |
290 | ", disabling posix open support." | |
291 | " Check if server update available.", | |
292 | tcon->ses->serverName, | |
b6b38f70 | 293 | tcon->ses->serverNOS); |
64cc2c63 | 294 | tcon->broken_posix_open = true; |
276a74a4 SF |
295 | } else if ((rc != -EIO) && (rc != -EREMOTE) && |
296 | (rc != -EOPNOTSUPP)) /* path not found or net err */ | |
297 | goto out; | |
64cc2c63 SF |
298 | /* else fallthrough to retry open the old way on network i/o |
299 | or DFS errors */ | |
276a74a4 SF |
300 | } |
301 | ||
1da177e4 LT |
302 | desiredAccess = cifs_convert_flags(file->f_flags); |
303 | ||
304 | /********************************************************************* | |
305 | * open flag mapping table: | |
fb8c4b14 | 306 | * |
1da177e4 | 307 | * POSIX Flag CIFS Disposition |
fb8c4b14 | 308 | * ---------- ---------------- |
1da177e4 LT |
309 | * O_CREAT FILE_OPEN_IF |
310 | * O_CREAT | O_EXCL FILE_CREATE | |
311 | * O_CREAT | O_TRUNC FILE_OVERWRITE_IF | |
312 | * O_TRUNC FILE_OVERWRITE | |
313 | * none of the above FILE_OPEN | |
314 | * | |
315 | * Note that there is not a direct match between disposition | |
fb8c4b14 | 316 | * FILE_SUPERSEDE (ie create whether or not file exists although |
1da177e4 LT |
317 | * O_CREAT | O_TRUNC is similar but truncates the existing |
318 | * file rather than creating a new file as FILE_SUPERSEDE does | |
319 | * (which uses the attributes / metadata passed in on open call) | |
320 | *? | |
fb8c4b14 | 321 | *? O_SYNC is a reasonable match to CIFS writethrough flag |
1da177e4 LT |
322 | *? and the read write flags match reasonably. O_LARGEFILE |
323 | *? is irrelevant because largefile support is always used | |
324 | *? by this client. Flags O_APPEND, O_DIRECT, O_DIRECTORY, | |
325 | * O_FASYNC, O_NOFOLLOW, O_NONBLOCK need further investigation | |
326 | *********************************************************************/ | |
327 | ||
328 | disposition = cifs_get_disposition(file->f_flags); | |
329 | ||
1da177e4 LT |
330 | /* BB pass O_SYNC flag through on file attributes .. BB */ |
331 | ||
332 | /* Also refresh inode by passing in file_info buf returned by SMBOpen | |
333 | and calling get_inode_info with returned buf (at least helps | |
334 | non-Unix server case) */ | |
335 | ||
fb8c4b14 SF |
336 | /* BB we can not do this if this is the second open of a file |
337 | and the first handle has writebehind data, we might be | |
1da177e4 LT |
338 | able to simply do a filemap_fdatawrite/filemap_fdatawait first */ |
339 | buf = kmalloc(sizeof(FILE_ALL_INFO), GFP_KERNEL); | |
340 | if (!buf) { | |
341 | rc = -ENOMEM; | |
342 | goto out; | |
343 | } | |
5bafd765 SF |
344 | |
345 | if (cifs_sb->tcon->ses->capabilities & CAP_NT_SMBS) | |
276a74a4 | 346 | rc = CIFSSMBOpen(xid, tcon, full_path, disposition, |
5bafd765 | 347 | desiredAccess, CREATE_NOT_DIR, &netfid, &oplock, buf, |
737b758c SF |
348 | cifs_sb->local_nls, cifs_sb->mnt_cifs_flags |
349 | & CIFS_MOUNT_MAP_SPECIAL_CHR); | |
5bafd765 SF |
350 | else |
351 | rc = -EIO; /* no NT SMB support fall into legacy open below */ | |
352 | ||
a9d02ad4 SF |
353 | if (rc == -EIO) { |
354 | /* Old server, try legacy style OpenX */ | |
276a74a4 | 355 | rc = SMBLegacyOpen(xid, tcon, full_path, disposition, |
a9d02ad4 SF |
356 | desiredAccess, CREATE_NOT_DIR, &netfid, &oplock, buf, |
357 | cifs_sb->local_nls, cifs_sb->mnt_cifs_flags | |
358 | & CIFS_MOUNT_MAP_SPECIAL_CHR); | |
359 | } | |
1da177e4 | 360 | if (rc) { |
b6b38f70 | 361 | cFYI(1, "cifs_open returned 0x%x", rc); |
1da177e4 LT |
362 | goto out; |
363 | } | |
3321b791 | 364 | |
47c78b7f JL |
365 | rc = cifs_open_inode_helper(inode, tcon, &oplock, buf, full_path, xid); |
366 | if (rc != 0) | |
367 | goto out; | |
368 | ||
086f68bd JL |
369 | pCifsFile = cifs_new_fileinfo(inode, netfid, file, file->f_path.mnt, |
370 | file->f_flags); | |
6ca9f3ba | 371 | if (pCifsFile == NULL) { |
1da177e4 LT |
372 | rc = -ENOMEM; |
373 | goto out; | |
374 | } | |
1da177e4 | 375 | |
fb8c4b14 | 376 | if (oplock & CIFS_CREATE_ACTION) { |
1da177e4 LT |
377 | /* time to set mode which we can not set earlier due to |
378 | problems creating new read-only files */ | |
276a74a4 | 379 | if (tcon->unix_ext) { |
4e1e7fb9 JL |
380 | struct cifs_unix_set_info_args args = { |
381 | .mode = inode->i_mode, | |
382 | .uid = NO_CHANGE_64, | |
383 | .gid = NO_CHANGE_64, | |
384 | .ctime = NO_CHANGE_64, | |
385 | .atime = NO_CHANGE_64, | |
386 | .mtime = NO_CHANGE_64, | |
387 | .device = 0, | |
388 | }; | |
01ea95e3 JL |
389 | CIFSSMBUnixSetPathInfo(xid, tcon, full_path, &args, |
390 | cifs_sb->local_nls, | |
391 | cifs_sb->mnt_cifs_flags & | |
737b758c | 392 | CIFS_MOUNT_MAP_SPECIAL_CHR); |
1da177e4 LT |
393 | } |
394 | } | |
395 | ||
396 | out: | |
397 | kfree(buf); | |
398 | kfree(full_path); | |
399 | FreeXid(xid); | |
400 | return rc; | |
401 | } | |
402 | ||
0418726b | 403 | /* Try to reacquire byte range locks that were released when session */ |
1da177e4 LT |
404 | /* to server was lost */ |
405 | static int cifs_relock_file(struct cifsFileInfo *cifsFile) | |
406 | { | |
407 | int rc = 0; | |
408 | ||
409 | /* BB list all locks open on this file and relock */ | |
410 | ||
411 | return rc; | |
412 | } | |
413 | ||
4b18f2a9 | 414 | static int cifs_reopen_file(struct file *file, bool can_flush) |
1da177e4 LT |
415 | { |
416 | int rc = -EACCES; | |
590a3fe0 JL |
417 | int xid; |
418 | __u32 oplock; | |
1da177e4 | 419 | struct cifs_sb_info *cifs_sb; |
7fc8f4e9 | 420 | struct cifsTconInfo *tcon; |
1da177e4 LT |
421 | struct cifsFileInfo *pCifsFile; |
422 | struct cifsInodeInfo *pCifsInode; | |
fb8c4b14 | 423 | struct inode *inode; |
1da177e4 LT |
424 | char *full_path = NULL; |
425 | int desiredAccess; | |
426 | int disposition = FILE_OPEN; | |
427 | __u16 netfid; | |
428 | ||
ad7a2926 | 429 | if (file->private_data) |
1da177e4 | 430 | pCifsFile = (struct cifsFileInfo *)file->private_data; |
ad7a2926 | 431 | else |
1da177e4 LT |
432 | return -EBADF; |
433 | ||
434 | xid = GetXid(); | |
f0a71eb8 | 435 | mutex_lock(&pCifsFile->fh_mutex); |
4b18f2a9 | 436 | if (!pCifsFile->invalidHandle) { |
f0a71eb8 | 437 | mutex_unlock(&pCifsFile->fh_mutex); |
0f3bc09e | 438 | rc = 0; |
1da177e4 | 439 | FreeXid(xid); |
0f3bc09e | 440 | return rc; |
1da177e4 LT |
441 | } |
442 | ||
e6a00296 | 443 | if (file->f_path.dentry == NULL) { |
b6b38f70 | 444 | cERROR(1, "no valid name if dentry freed"); |
3a9f462f SF |
445 | dump_stack(); |
446 | rc = -EBADF; | |
447 | goto reopen_error_exit; | |
448 | } | |
449 | ||
450 | inode = file->f_path.dentry->d_inode; | |
fb8c4b14 | 451 | if (inode == NULL) { |
b6b38f70 | 452 | cERROR(1, "inode not valid"); |
3a9f462f SF |
453 | dump_stack(); |
454 | rc = -EBADF; | |
455 | goto reopen_error_exit; | |
1da177e4 | 456 | } |
50c2f753 | 457 | |
1da177e4 | 458 | cifs_sb = CIFS_SB(inode->i_sb); |
7fc8f4e9 | 459 | tcon = cifs_sb->tcon; |
3a9f462f | 460 | |
1da177e4 LT |
461 | /* can not grab rename sem here because various ops, including |
462 | those that already have the rename sem can end up causing writepage | |
463 | to get called and if the server was down that means we end up here, | |
464 | and we can never tell if the caller already has the rename_sem */ | |
e6a00296 | 465 | full_path = build_path_from_dentry(file->f_path.dentry); |
1da177e4 | 466 | if (full_path == NULL) { |
3a9f462f SF |
467 | rc = -ENOMEM; |
468 | reopen_error_exit: | |
f0a71eb8 | 469 | mutex_unlock(&pCifsFile->fh_mutex); |
1da177e4 | 470 | FreeXid(xid); |
3a9f462f | 471 | return rc; |
1da177e4 LT |
472 | } |
473 | ||
b6b38f70 JP |
474 | cFYI(1, "inode = 0x%p file flags 0x%x for %s", |
475 | inode, file->f_flags, full_path); | |
1da177e4 LT |
476 | |
477 | if (oplockEnabled) | |
478 | oplock = REQ_OPLOCK; | |
479 | else | |
4b18f2a9 | 480 | oplock = 0; |
1da177e4 | 481 | |
7fc8f4e9 SF |
482 | if (tcon->unix_ext && (tcon->ses->capabilities & CAP_UNIX) && |
483 | (CIFS_UNIX_POSIX_PATH_OPS_CAP & | |
484 | le64_to_cpu(tcon->fsUnixInfo.Capability))) { | |
485 | int oflags = (int) cifs_posix_convert_flags(file->f_flags); | |
486 | /* can not refresh inode info since size could be stale */ | |
2422f676 | 487 | rc = cifs_posix_open(full_path, NULL, inode->i_sb, |
fa588e0c SF |
488 | cifs_sb->mnt_file_mode /* ignored */, |
489 | oflags, &oplock, &netfid, xid); | |
7fc8f4e9 | 490 | if (rc == 0) { |
b6b38f70 | 491 | cFYI(1, "posix reopen succeeded"); |
7fc8f4e9 SF |
492 | goto reopen_success; |
493 | } | |
494 | /* fallthrough to retry open the old way on errors, especially | |
495 | in the reconnect path it is important to retry hard */ | |
496 | } | |
497 | ||
498 | desiredAccess = cifs_convert_flags(file->f_flags); | |
499 | ||
1da177e4 | 500 | /* Can not refresh inode by passing in file_info buf to be returned |
fb8c4b14 SF |
501 | by SMBOpen and then calling get_inode_info with returned buf |
502 | since file might have write behind data that needs to be flushed | |
1da177e4 LT |
503 | and server version of file size can be stale. If we knew for sure |
504 | that inode was not dirty locally we could do this */ | |
505 | ||
7fc8f4e9 | 506 | rc = CIFSSMBOpen(xid, tcon, full_path, disposition, desiredAccess, |
1da177e4 | 507 | CREATE_NOT_DIR, &netfid, &oplock, NULL, |
fb8c4b14 | 508 | cifs_sb->local_nls, cifs_sb->mnt_cifs_flags & |
737b758c | 509 | CIFS_MOUNT_MAP_SPECIAL_CHR); |
1da177e4 | 510 | if (rc) { |
f0a71eb8 | 511 | mutex_unlock(&pCifsFile->fh_mutex); |
b6b38f70 JP |
512 | cFYI(1, "cifs_open returned 0x%x", rc); |
513 | cFYI(1, "oplock: %d", oplock); | |
1da177e4 | 514 | } else { |
7fc8f4e9 | 515 | reopen_success: |
1da177e4 | 516 | pCifsFile->netfid = netfid; |
4b18f2a9 | 517 | pCifsFile->invalidHandle = false; |
f0a71eb8 | 518 | mutex_unlock(&pCifsFile->fh_mutex); |
1da177e4 LT |
519 | pCifsInode = CIFS_I(inode); |
520 | if (pCifsInode) { | |
521 | if (can_flush) { | |
cea21805 JL |
522 | rc = filemap_write_and_wait(inode->i_mapping); |
523 | if (rc != 0) | |
524 | CIFS_I(inode)->write_behind_rc = rc; | |
1da177e4 LT |
525 | /* temporarily disable caching while we |
526 | go to server to get inode info */ | |
4b18f2a9 SF |
527 | pCifsInode->clientCanCacheAll = false; |
528 | pCifsInode->clientCanCacheRead = false; | |
7fc8f4e9 | 529 | if (tcon->unix_ext) |
1da177e4 LT |
530 | rc = cifs_get_inode_info_unix(&inode, |
531 | full_path, inode->i_sb, xid); | |
532 | else | |
533 | rc = cifs_get_inode_info(&inode, | |
534 | full_path, NULL, inode->i_sb, | |
8b1327f6 | 535 | xid, NULL); |
1da177e4 LT |
536 | } /* else we are writing out data to server already |
537 | and could deadlock if we tried to flush data, and | |
538 | since we do not know if we have data that would | |
539 | invalidate the current end of file on the server | |
540 | we can not go to the server to get the new inod | |
541 | info */ | |
542 | if ((oplock & 0xF) == OPLOCK_EXCLUSIVE) { | |
4b18f2a9 SF |
543 | pCifsInode->clientCanCacheAll = true; |
544 | pCifsInode->clientCanCacheRead = true; | |
b6b38f70 JP |
545 | cFYI(1, "Exclusive Oplock granted on inode %p", |
546 | file->f_path.dentry->d_inode); | |
1da177e4 | 547 | } else if ((oplock & 0xF) == OPLOCK_READ) { |
4b18f2a9 SF |
548 | pCifsInode->clientCanCacheRead = true; |
549 | pCifsInode->clientCanCacheAll = false; | |
1da177e4 | 550 | } else { |
4b18f2a9 SF |
551 | pCifsInode->clientCanCacheRead = false; |
552 | pCifsInode->clientCanCacheAll = false; | |
1da177e4 LT |
553 | } |
554 | cifs_relock_file(pCifsFile); | |
555 | } | |
556 | } | |
1da177e4 LT |
557 | kfree(full_path); |
558 | FreeXid(xid); | |
559 | return rc; | |
560 | } | |
561 | ||
562 | int cifs_close(struct inode *inode, struct file *file) | |
563 | { | |
564 | int rc = 0; | |
15745320 | 565 | int xid, timeout; |
1da177e4 LT |
566 | struct cifs_sb_info *cifs_sb; |
567 | struct cifsTconInfo *pTcon; | |
568 | struct cifsFileInfo *pSMBFile = | |
569 | (struct cifsFileInfo *)file->private_data; | |
570 | ||
571 | xid = GetXid(); | |
572 | ||
573 | cifs_sb = CIFS_SB(inode->i_sb); | |
574 | pTcon = cifs_sb->tcon; | |
575 | if (pSMBFile) { | |
7ee1af76 | 576 | struct cifsLockInfo *li, *tmp; |
ddb4cbfc | 577 | write_lock(&GlobalSMBSeslock); |
4b18f2a9 | 578 | pSMBFile->closePend = true; |
1da177e4 LT |
579 | if (pTcon) { |
580 | /* no sense reconnecting to close a file that is | |
581 | already closed */ | |
3b795210 | 582 | if (!pTcon->need_reconnect) { |
ddb4cbfc | 583 | write_unlock(&GlobalSMBSeslock); |
15745320 | 584 | timeout = 2; |
6ab409b5 | 585 | while ((atomic_read(&pSMBFile->count) != 1) |
15745320 | 586 | && (timeout <= 2048)) { |
23e7dd7d SF |
587 | /* Give write a better chance to get to |
588 | server ahead of the close. We do not | |
589 | want to add a wait_q here as it would | |
590 | increase the memory utilization as | |
591 | the struct would be in each open file, | |
fb8c4b14 | 592 | but this should give enough time to |
23e7dd7d | 593 | clear the socket */ |
b6b38f70 | 594 | cFYI(DBG2, "close delay, write pending"); |
23e7dd7d SF |
595 | msleep(timeout); |
596 | timeout *= 4; | |
4891d539 | 597 | } |
ddb4cbfc SF |
598 | if (!pTcon->need_reconnect && |
599 | !pSMBFile->invalidHandle) | |
600 | rc = CIFSSMBClose(xid, pTcon, | |
1da177e4 | 601 | pSMBFile->netfid); |
ddb4cbfc SF |
602 | } else |
603 | write_unlock(&GlobalSMBSeslock); | |
604 | } else | |
605 | write_unlock(&GlobalSMBSeslock); | |
7ee1af76 JA |
606 | |
607 | /* Delete any outstanding lock records. | |
608 | We'll lose them when the file is closed anyway. */ | |
796e5661 | 609 | mutex_lock(&pSMBFile->lock_mutex); |
7ee1af76 JA |
610 | list_for_each_entry_safe(li, tmp, &pSMBFile->llist, llist) { |
611 | list_del(&li->llist); | |
612 | kfree(li); | |
613 | } | |
796e5661 | 614 | mutex_unlock(&pSMBFile->lock_mutex); |
7ee1af76 | 615 | |
cbe0476f | 616 | write_lock(&GlobalSMBSeslock); |
1da177e4 LT |
617 | list_del(&pSMBFile->flist); |
618 | list_del(&pSMBFile->tlist); | |
cbe0476f | 619 | write_unlock(&GlobalSMBSeslock); |
6ab409b5 | 620 | cifsFileInfo_put(file->private_data); |
1da177e4 LT |
621 | file->private_data = NULL; |
622 | } else | |
623 | rc = -EBADF; | |
624 | ||
4efa53f0 | 625 | read_lock(&GlobalSMBSeslock); |
1da177e4 | 626 | if (list_empty(&(CIFS_I(inode)->openFileList))) { |
b6b38f70 | 627 | cFYI(1, "closing last open instance for inode %p", inode); |
1da177e4 LT |
628 | /* if the file is not open we do not know if we can cache info |
629 | on this inode, much less write behind and read ahead */ | |
4b18f2a9 SF |
630 | CIFS_I(inode)->clientCanCacheRead = false; |
631 | CIFS_I(inode)->clientCanCacheAll = false; | |
1da177e4 | 632 | } |
4efa53f0 | 633 | read_unlock(&GlobalSMBSeslock); |
fb8c4b14 | 634 | if ((rc == 0) && CIFS_I(inode)->write_behind_rc) |
1da177e4 LT |
635 | rc = CIFS_I(inode)->write_behind_rc; |
636 | FreeXid(xid); | |
637 | return rc; | |
638 | } | |
639 | ||
640 | int cifs_closedir(struct inode *inode, struct file *file) | |
641 | { | |
642 | int rc = 0; | |
643 | int xid; | |
644 | struct cifsFileInfo *pCFileStruct = | |
645 | (struct cifsFileInfo *)file->private_data; | |
646 | char *ptmp; | |
647 | ||
b6b38f70 | 648 | cFYI(1, "Closedir inode = 0x%p", inode); |
1da177e4 LT |
649 | |
650 | xid = GetXid(); | |
651 | ||
652 | if (pCFileStruct) { | |
653 | struct cifsTconInfo *pTcon; | |
fb8c4b14 SF |
654 | struct cifs_sb_info *cifs_sb = |
655 | CIFS_SB(file->f_path.dentry->d_sb); | |
1da177e4 LT |
656 | |
657 | pTcon = cifs_sb->tcon; | |
658 | ||
b6b38f70 | 659 | cFYI(1, "Freeing private data in close dir"); |
ddb4cbfc | 660 | write_lock(&GlobalSMBSeslock); |
4b18f2a9 SF |
661 | if (!pCFileStruct->srch_inf.endOfSearch && |
662 | !pCFileStruct->invalidHandle) { | |
663 | pCFileStruct->invalidHandle = true; | |
ddb4cbfc | 664 | write_unlock(&GlobalSMBSeslock); |
1da177e4 | 665 | rc = CIFSFindClose(xid, pTcon, pCFileStruct->netfid); |
b6b38f70 JP |
666 | cFYI(1, "Closing uncompleted readdir with rc %d", |
667 | rc); | |
1da177e4 LT |
668 | /* not much we can do if it fails anyway, ignore rc */ |
669 | rc = 0; | |
ddb4cbfc SF |
670 | } else |
671 | write_unlock(&GlobalSMBSeslock); | |
1da177e4 LT |
672 | ptmp = pCFileStruct->srch_inf.ntwrk_buf_start; |
673 | if (ptmp) { | |
b6b38f70 | 674 | cFYI(1, "closedir free smb buf in srch struct"); |
1da177e4 | 675 | pCFileStruct->srch_inf.ntwrk_buf_start = NULL; |
fb8c4b14 | 676 | if (pCFileStruct->srch_inf.smallBuf) |
d47d7c1a SF |
677 | cifs_small_buf_release(ptmp); |
678 | else | |
679 | cifs_buf_release(ptmp); | |
1da177e4 | 680 | } |
1da177e4 LT |
681 | kfree(file->private_data); |
682 | file->private_data = NULL; | |
683 | } | |
684 | /* BB can we lock the filestruct while this is going on? */ | |
685 | FreeXid(xid); | |
686 | return rc; | |
687 | } | |
688 | ||
7ee1af76 JA |
689 | static int store_file_lock(struct cifsFileInfo *fid, __u64 len, |
690 | __u64 offset, __u8 lockType) | |
691 | { | |
fb8c4b14 SF |
692 | struct cifsLockInfo *li = |
693 | kmalloc(sizeof(struct cifsLockInfo), GFP_KERNEL); | |
7ee1af76 JA |
694 | if (li == NULL) |
695 | return -ENOMEM; | |
696 | li->offset = offset; | |
697 | li->length = len; | |
698 | li->type = lockType; | |
796e5661 | 699 | mutex_lock(&fid->lock_mutex); |
7ee1af76 | 700 | list_add(&li->llist, &fid->llist); |
796e5661 | 701 | mutex_unlock(&fid->lock_mutex); |
7ee1af76 JA |
702 | return 0; |
703 | } | |
704 | ||
1da177e4 LT |
705 | int cifs_lock(struct file *file, int cmd, struct file_lock *pfLock) |
706 | { | |
707 | int rc, xid; | |
1da177e4 LT |
708 | __u32 numLock = 0; |
709 | __u32 numUnlock = 0; | |
710 | __u64 length; | |
4b18f2a9 | 711 | bool wait_flag = false; |
1da177e4 | 712 | struct cifs_sb_info *cifs_sb; |
13a6e42a | 713 | struct cifsTconInfo *tcon; |
08547b03 SF |
714 | __u16 netfid; |
715 | __u8 lockType = LOCKING_ANDX_LARGE_FILES; | |
13a6e42a | 716 | bool posix_locking = 0; |
1da177e4 LT |
717 | |
718 | length = 1 + pfLock->fl_end - pfLock->fl_start; | |
719 | rc = -EACCES; | |
720 | xid = GetXid(); | |
721 | ||
b6b38f70 | 722 | cFYI(1, "Lock parm: 0x%x flockflags: " |
1da177e4 | 723 | "0x%x flocktype: 0x%x start: %lld end: %lld", |
fb8c4b14 | 724 | cmd, pfLock->fl_flags, pfLock->fl_type, pfLock->fl_start, |
b6b38f70 | 725 | pfLock->fl_end); |
1da177e4 LT |
726 | |
727 | if (pfLock->fl_flags & FL_POSIX) | |
b6b38f70 | 728 | cFYI(1, "Posix"); |
1da177e4 | 729 | if (pfLock->fl_flags & FL_FLOCK) |
b6b38f70 | 730 | cFYI(1, "Flock"); |
1da177e4 | 731 | if (pfLock->fl_flags & FL_SLEEP) { |
b6b38f70 | 732 | cFYI(1, "Blocking lock"); |
4b18f2a9 | 733 | wait_flag = true; |
1da177e4 LT |
734 | } |
735 | if (pfLock->fl_flags & FL_ACCESS) | |
b6b38f70 JP |
736 | cFYI(1, "Process suspended by mandatory locking - " |
737 | "not implemented yet"); | |
1da177e4 | 738 | if (pfLock->fl_flags & FL_LEASE) |
b6b38f70 | 739 | cFYI(1, "Lease on file - not implemented yet"); |
fb8c4b14 | 740 | if (pfLock->fl_flags & |
1da177e4 | 741 | (~(FL_POSIX | FL_FLOCK | FL_SLEEP | FL_ACCESS | FL_LEASE))) |
b6b38f70 | 742 | cFYI(1, "Unknown lock flags 0x%x", pfLock->fl_flags); |
1da177e4 LT |
743 | |
744 | if (pfLock->fl_type == F_WRLCK) { | |
b6b38f70 | 745 | cFYI(1, "F_WRLCK "); |
1da177e4 LT |
746 | numLock = 1; |
747 | } else if (pfLock->fl_type == F_UNLCK) { | |
b6b38f70 | 748 | cFYI(1, "F_UNLCK"); |
1da177e4 | 749 | numUnlock = 1; |
d47d7c1a SF |
750 | /* Check if unlock includes more than |
751 | one lock range */ | |
1da177e4 | 752 | } else if (pfLock->fl_type == F_RDLCK) { |
b6b38f70 | 753 | cFYI(1, "F_RDLCK"); |
1da177e4 LT |
754 | lockType |= LOCKING_ANDX_SHARED_LOCK; |
755 | numLock = 1; | |
756 | } else if (pfLock->fl_type == F_EXLCK) { | |
b6b38f70 | 757 | cFYI(1, "F_EXLCK"); |
1da177e4 LT |
758 | numLock = 1; |
759 | } else if (pfLock->fl_type == F_SHLCK) { | |
b6b38f70 | 760 | cFYI(1, "F_SHLCK"); |
1da177e4 LT |
761 | lockType |= LOCKING_ANDX_SHARED_LOCK; |
762 | numLock = 1; | |
763 | } else | |
b6b38f70 | 764 | cFYI(1, "Unknown type of lock"); |
1da177e4 | 765 | |
e6a00296 | 766 | cifs_sb = CIFS_SB(file->f_path.dentry->d_sb); |
13a6e42a | 767 | tcon = cifs_sb->tcon; |
1da177e4 LT |
768 | |
769 | if (file->private_data == NULL) { | |
0f3bc09e | 770 | rc = -EBADF; |
1da177e4 | 771 | FreeXid(xid); |
0f3bc09e | 772 | return rc; |
1da177e4 | 773 | } |
08547b03 SF |
774 | netfid = ((struct cifsFileInfo *)file->private_data)->netfid; |
775 | ||
13a6e42a SF |
776 | if ((tcon->ses->capabilities & CAP_UNIX) && |
777 | (CIFS_UNIX_FCNTL_CAP & le64_to_cpu(tcon->fsUnixInfo.Capability)) && | |
acc18aa1 | 778 | ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NOPOSIXBRL) == 0)) |
13a6e42a | 779 | posix_locking = 1; |
08547b03 SF |
780 | /* BB add code here to normalize offset and length to |
781 | account for negative length which we can not accept over the | |
782 | wire */ | |
1da177e4 | 783 | if (IS_GETLK(cmd)) { |
fb8c4b14 | 784 | if (posix_locking) { |
08547b03 | 785 | int posix_lock_type; |
fb8c4b14 | 786 | if (lockType & LOCKING_ANDX_SHARED_LOCK) |
08547b03 SF |
787 | posix_lock_type = CIFS_RDLCK; |
788 | else | |
789 | posix_lock_type = CIFS_WRLCK; | |
13a6e42a | 790 | rc = CIFSSMBPosixLock(xid, tcon, netfid, 1 /* get */, |
fc94cdb9 | 791 | length, pfLock, |
08547b03 SF |
792 | posix_lock_type, wait_flag); |
793 | FreeXid(xid); | |
794 | return rc; | |
795 | } | |
796 | ||
797 | /* BB we could chain these into one lock request BB */ | |
13a6e42a | 798 | rc = CIFSSMBLock(xid, tcon, netfid, length, pfLock->fl_start, |
08547b03 | 799 | 0, 1, lockType, 0 /* wait flag */ ); |
1da177e4 | 800 | if (rc == 0) { |
13a6e42a | 801 | rc = CIFSSMBLock(xid, tcon, netfid, length, |
1da177e4 LT |
802 | pfLock->fl_start, 1 /* numUnlock */ , |
803 | 0 /* numLock */ , lockType, | |
804 | 0 /* wait flag */ ); | |
805 | pfLock->fl_type = F_UNLCK; | |
806 | if (rc != 0) | |
b6b38f70 JP |
807 | cERROR(1, "Error unlocking previously locked " |
808 | "range %d during test of lock", rc); | |
1da177e4 LT |
809 | rc = 0; |
810 | ||
811 | } else { | |
812 | /* if rc == ERR_SHARING_VIOLATION ? */ | |
f05337c6 PS |
813 | rc = 0; |
814 | ||
815 | if (lockType & LOCKING_ANDX_SHARED_LOCK) { | |
816 | pfLock->fl_type = F_WRLCK; | |
817 | } else { | |
818 | rc = CIFSSMBLock(xid, tcon, netfid, length, | |
819 | pfLock->fl_start, 0, 1, | |
820 | lockType | LOCKING_ANDX_SHARED_LOCK, | |
821 | 0 /* wait flag */); | |
822 | if (rc == 0) { | |
823 | rc = CIFSSMBLock(xid, tcon, netfid, | |
824 | length, pfLock->fl_start, 1, 0, | |
825 | lockType | | |
826 | LOCKING_ANDX_SHARED_LOCK, | |
827 | 0 /* wait flag */); | |
828 | pfLock->fl_type = F_RDLCK; | |
829 | if (rc != 0) | |
f19159dc | 830 | cERROR(1, "Error unlocking " |
f05337c6 | 831 | "previously locked range %d " |
f19159dc | 832 | "during test of lock", rc); |
f05337c6 PS |
833 | rc = 0; |
834 | } else { | |
835 | pfLock->fl_type = F_WRLCK; | |
836 | rc = 0; | |
837 | } | |
838 | } | |
1da177e4 LT |
839 | } |
840 | ||
841 | FreeXid(xid); | |
842 | return rc; | |
843 | } | |
7ee1af76 JA |
844 | |
845 | if (!numLock && !numUnlock) { | |
846 | /* if no lock or unlock then nothing | |
847 | to do since we do not know what it is */ | |
848 | FreeXid(xid); | |
849 | return -EOPNOTSUPP; | |
850 | } | |
851 | ||
852 | if (posix_locking) { | |
08547b03 | 853 | int posix_lock_type; |
fb8c4b14 | 854 | if (lockType & LOCKING_ANDX_SHARED_LOCK) |
08547b03 SF |
855 | posix_lock_type = CIFS_RDLCK; |
856 | else | |
857 | posix_lock_type = CIFS_WRLCK; | |
50c2f753 | 858 | |
fb8c4b14 | 859 | if (numUnlock == 1) |
beb84dc8 | 860 | posix_lock_type = CIFS_UNLCK; |
7ee1af76 | 861 | |
13a6e42a | 862 | rc = CIFSSMBPosixLock(xid, tcon, netfid, 0 /* set */, |
fc94cdb9 | 863 | length, pfLock, |
08547b03 | 864 | posix_lock_type, wait_flag); |
7ee1af76 | 865 | } else { |
fb8c4b14 SF |
866 | struct cifsFileInfo *fid = |
867 | (struct cifsFileInfo *)file->private_data; | |
7ee1af76 JA |
868 | |
869 | if (numLock) { | |
13a6e42a | 870 | rc = CIFSSMBLock(xid, tcon, netfid, length, |
fb8c4b14 | 871 | pfLock->fl_start, |
7ee1af76 JA |
872 | 0, numLock, lockType, wait_flag); |
873 | ||
874 | if (rc == 0) { | |
875 | /* For Windows locks we must store them. */ | |
876 | rc = store_file_lock(fid, length, | |
877 | pfLock->fl_start, lockType); | |
878 | } | |
879 | } else if (numUnlock) { | |
880 | /* For each stored lock that this unlock overlaps | |
881 | completely, unlock it. */ | |
882 | int stored_rc = 0; | |
883 | struct cifsLockInfo *li, *tmp; | |
884 | ||
6b70c955 | 885 | rc = 0; |
796e5661 | 886 | mutex_lock(&fid->lock_mutex); |
7ee1af76 JA |
887 | list_for_each_entry_safe(li, tmp, &fid->llist, llist) { |
888 | if (pfLock->fl_start <= li->offset && | |
c19eb710 | 889 | (pfLock->fl_start + length) >= |
39db810c | 890 | (li->offset + li->length)) { |
13a6e42a | 891 | stored_rc = CIFSSMBLock(xid, tcon, |
fb8c4b14 | 892 | netfid, |
7ee1af76 | 893 | li->length, li->offset, |
4b18f2a9 | 894 | 1, 0, li->type, false); |
7ee1af76 JA |
895 | if (stored_rc) |
896 | rc = stored_rc; | |
2c964d1f PS |
897 | else { |
898 | list_del(&li->llist); | |
899 | kfree(li); | |
900 | } | |
7ee1af76 JA |
901 | } |
902 | } | |
796e5661 | 903 | mutex_unlock(&fid->lock_mutex); |
7ee1af76 JA |
904 | } |
905 | } | |
906 | ||
d634cc15 | 907 | if (pfLock->fl_flags & FL_POSIX) |
1da177e4 LT |
908 | posix_lock_file_wait(file, pfLock); |
909 | FreeXid(xid); | |
910 | return rc; | |
911 | } | |
912 | ||
fbec9ab9 JL |
913 | /* |
914 | * Set the timeout on write requests past EOF. For some servers (Windows) | |
915 | * these calls can be very long. | |
916 | * | |
917 | * If we're writing >10M past the EOF we give a 180s timeout. Anything less | |
918 | * than that gets a 45s timeout. Writes not past EOF get 15s timeouts. | |
919 | * The 10M cutoff is totally arbitrary. A better scheme for this would be | |
920 | * welcome if someone wants to suggest one. | |
921 | * | |
922 | * We may be able to do a better job with this if there were some way to | |
923 | * declare that a file should be sparse. | |
924 | */ | |
925 | static int | |
926 | cifs_write_timeout(struct cifsInodeInfo *cifsi, loff_t offset) | |
927 | { | |
928 | if (offset <= cifsi->server_eof) | |
929 | return CIFS_STD_OP; | |
930 | else if (offset > (cifsi->server_eof + (10 * 1024 * 1024))) | |
931 | return CIFS_VLONG_OP; | |
932 | else | |
933 | return CIFS_LONG_OP; | |
934 | } | |
935 | ||
936 | /* update the file size (if needed) after a write */ | |
937 | static void | |
938 | cifs_update_eof(struct cifsInodeInfo *cifsi, loff_t offset, | |
939 | unsigned int bytes_written) | |
940 | { | |
941 | loff_t end_of_write = offset + bytes_written; | |
942 | ||
943 | if (end_of_write > cifsi->server_eof) | |
944 | cifsi->server_eof = end_of_write; | |
945 | } | |
946 | ||
1da177e4 LT |
947 | ssize_t cifs_user_write(struct file *file, const char __user *write_data, |
948 | size_t write_size, loff_t *poffset) | |
949 | { | |
950 | int rc = 0; | |
951 | unsigned int bytes_written = 0; | |
952 | unsigned int total_written; | |
953 | struct cifs_sb_info *cifs_sb; | |
954 | struct cifsTconInfo *pTcon; | |
955 | int xid, long_op; | |
956 | struct cifsFileInfo *open_file; | |
fbec9ab9 | 957 | struct cifsInodeInfo *cifsi = CIFS_I(file->f_path.dentry->d_inode); |
1da177e4 | 958 | |
e6a00296 | 959 | cifs_sb = CIFS_SB(file->f_path.dentry->d_sb); |
1da177e4 LT |
960 | |
961 | pTcon = cifs_sb->tcon; | |
962 | ||
b6b38f70 JP |
963 | /* cFYI(1, " write %d bytes to offset %lld of %s", write_size, |
964 | *poffset, file->f_path.dentry->d_name.name); */ | |
1da177e4 LT |
965 | |
966 | if (file->private_data == NULL) | |
967 | return -EBADF; | |
c33f8d32 | 968 | open_file = (struct cifsFileInfo *) file->private_data; |
50c2f753 | 969 | |
838726c4 JL |
970 | rc = generic_write_checks(file, poffset, &write_size, 0); |
971 | if (rc) | |
972 | return rc; | |
973 | ||
1da177e4 | 974 | xid = GetXid(); |
1da177e4 | 975 | |
fbec9ab9 | 976 | long_op = cifs_write_timeout(cifsi, *poffset); |
1da177e4 LT |
977 | for (total_written = 0; write_size > total_written; |
978 | total_written += bytes_written) { | |
979 | rc = -EAGAIN; | |
980 | while (rc == -EAGAIN) { | |
981 | if (file->private_data == NULL) { | |
982 | /* file has been closed on us */ | |
983 | FreeXid(xid); | |
984 | /* if we have gotten here we have written some data | |
985 | and blocked, and the file has been freed on us while | |
986 | we blocked so return what we managed to write */ | |
987 | return total_written; | |
fb8c4b14 | 988 | } |
1da177e4 LT |
989 | if (open_file->closePend) { |
990 | FreeXid(xid); | |
991 | if (total_written) | |
992 | return total_written; | |
993 | else | |
994 | return -EBADF; | |
995 | } | |
996 | if (open_file->invalidHandle) { | |
1da177e4 LT |
997 | /* we could deadlock if we called |
998 | filemap_fdatawait from here so tell | |
999 | reopen_file not to flush data to server | |
1000 | now */ | |
4b18f2a9 | 1001 | rc = cifs_reopen_file(file, false); |
1da177e4 LT |
1002 | if (rc != 0) |
1003 | break; | |
1004 | } | |
1005 | ||
1006 | rc = CIFSSMBWrite(xid, pTcon, | |
1007 | open_file->netfid, | |
1008 | min_t(const int, cifs_sb->wsize, | |
1009 | write_size - total_written), | |
1010 | *poffset, &bytes_written, | |
1011 | NULL, write_data + total_written, long_op); | |
1012 | } | |
1013 | if (rc || (bytes_written == 0)) { | |
1014 | if (total_written) | |
1015 | break; | |
1016 | else { | |
1017 | FreeXid(xid); | |
1018 | return rc; | |
1019 | } | |
fbec9ab9 JL |
1020 | } else { |
1021 | cifs_update_eof(cifsi, *poffset, bytes_written); | |
1da177e4 | 1022 | *poffset += bytes_written; |
fbec9ab9 | 1023 | } |
133672ef | 1024 | long_op = CIFS_STD_OP; /* subsequent writes fast - |
1da177e4 LT |
1025 | 15 seconds is plenty */ |
1026 | } | |
1027 | ||
a4544347 | 1028 | cifs_stats_bytes_written(pTcon, total_written); |
1da177e4 LT |
1029 | |
1030 | /* since the write may have blocked check these pointers again */ | |
3677db10 SF |
1031 | if ((file->f_path.dentry) && (file->f_path.dentry->d_inode)) { |
1032 | struct inode *inode = file->f_path.dentry->d_inode; | |
fb8c4b14 SF |
1033 | /* Do not update local mtime - server will set its actual value on write |
1034 | * inode->i_ctime = inode->i_mtime = | |
3677db10 SF |
1035 | * current_fs_time(inode->i_sb);*/ |
1036 | if (total_written > 0) { | |
1037 | spin_lock(&inode->i_lock); | |
1038 | if (*poffset > file->f_path.dentry->d_inode->i_size) | |
1039 | i_size_write(file->f_path.dentry->d_inode, | |
1da177e4 | 1040 | *poffset); |
3677db10 | 1041 | spin_unlock(&inode->i_lock); |
1da177e4 | 1042 | } |
fb8c4b14 | 1043 | mark_inode_dirty_sync(file->f_path.dentry->d_inode); |
1da177e4 LT |
1044 | } |
1045 | FreeXid(xid); | |
1046 | return total_written; | |
1047 | } | |
1048 | ||
1049 | static ssize_t cifs_write(struct file *file, const char *write_data, | |
d9414774 | 1050 | size_t write_size, loff_t *poffset) |
1da177e4 LT |
1051 | { |
1052 | int rc = 0; | |
1053 | unsigned int bytes_written = 0; | |
1054 | unsigned int total_written; | |
1055 | struct cifs_sb_info *cifs_sb; | |
1056 | struct cifsTconInfo *pTcon; | |
1057 | int xid, long_op; | |
1058 | struct cifsFileInfo *open_file; | |
fbec9ab9 | 1059 | struct cifsInodeInfo *cifsi = CIFS_I(file->f_path.dentry->d_inode); |
1da177e4 | 1060 | |
e6a00296 | 1061 | cifs_sb = CIFS_SB(file->f_path.dentry->d_sb); |
1da177e4 LT |
1062 | |
1063 | pTcon = cifs_sb->tcon; | |
1064 | ||
b6b38f70 JP |
1065 | cFYI(1, "write %zd bytes to offset %lld of %s", write_size, |
1066 | *poffset, file->f_path.dentry->d_name.name); | |
1da177e4 LT |
1067 | |
1068 | if (file->private_data == NULL) | |
1069 | return -EBADF; | |
c33f8d32 | 1070 | open_file = (struct cifsFileInfo *)file->private_data; |
50c2f753 | 1071 | |
1da177e4 | 1072 | xid = GetXid(); |
1da177e4 | 1073 | |
fbec9ab9 | 1074 | long_op = cifs_write_timeout(cifsi, *poffset); |
1da177e4 LT |
1075 | for (total_written = 0; write_size > total_written; |
1076 | total_written += bytes_written) { | |
1077 | rc = -EAGAIN; | |
1078 | while (rc == -EAGAIN) { | |
1079 | if (file->private_data == NULL) { | |
1080 | /* file has been closed on us */ | |
1081 | FreeXid(xid); | |
1082 | /* if we have gotten here we have written some data | |
1083 | and blocked, and the file has been freed on us | |
fb8c4b14 | 1084 | while we blocked so return what we managed to |
1da177e4 LT |
1085 | write */ |
1086 | return total_written; | |
fb8c4b14 | 1087 | } |
1da177e4 LT |
1088 | if (open_file->closePend) { |
1089 | FreeXid(xid); | |
1090 | if (total_written) | |
1091 | return total_written; | |
1092 | else | |
1093 | return -EBADF; | |
1094 | } | |
1095 | if (open_file->invalidHandle) { | |
1da177e4 LT |
1096 | /* we could deadlock if we called |
1097 | filemap_fdatawait from here so tell | |
fb8c4b14 | 1098 | reopen_file not to flush data to |
1da177e4 | 1099 | server now */ |
4b18f2a9 | 1100 | rc = cifs_reopen_file(file, false); |
1da177e4 LT |
1101 | if (rc != 0) |
1102 | break; | |
1103 | } | |
fb8c4b14 SF |
1104 | if (experimEnabled || (pTcon->ses->server && |
1105 | ((pTcon->ses->server->secMode & | |
08775834 | 1106 | (SECMODE_SIGN_REQUIRED | SECMODE_SIGN_ENABLED)) |
c01f36a8 | 1107 | == 0))) { |
3e84469d SF |
1108 | struct kvec iov[2]; |
1109 | unsigned int len; | |
1110 | ||
0ae0efad | 1111 | len = min((size_t)cifs_sb->wsize, |
3e84469d SF |
1112 | write_size - total_written); |
1113 | /* iov[0] is reserved for smb header */ | |
1114 | iov[1].iov_base = (char *)write_data + | |
1115 | total_written; | |
1116 | iov[1].iov_len = len; | |
d6e04ae6 | 1117 | rc = CIFSSMBWrite2(xid, pTcon, |
3e84469d | 1118 | open_file->netfid, len, |
d6e04ae6 | 1119 | *poffset, &bytes_written, |
3e84469d | 1120 | iov, 1, long_op); |
d6e04ae6 | 1121 | } else |
60808233 SF |
1122 | rc = CIFSSMBWrite(xid, pTcon, |
1123 | open_file->netfid, | |
1124 | min_t(const int, cifs_sb->wsize, | |
1125 | write_size - total_written), | |
1126 | *poffset, &bytes_written, | |
1127 | write_data + total_written, | |
1128 | NULL, long_op); | |
1da177e4 LT |
1129 | } |
1130 | if (rc || (bytes_written == 0)) { | |
1131 | if (total_written) | |
1132 | break; | |
1133 | else { | |
1134 | FreeXid(xid); | |
1135 | return rc; | |
1136 | } | |
fbec9ab9 JL |
1137 | } else { |
1138 | cifs_update_eof(cifsi, *poffset, bytes_written); | |
1da177e4 | 1139 | *poffset += bytes_written; |
fbec9ab9 | 1140 | } |
133672ef | 1141 | long_op = CIFS_STD_OP; /* subsequent writes fast - |
1da177e4 LT |
1142 | 15 seconds is plenty */ |
1143 | } | |
1144 | ||
a4544347 | 1145 | cifs_stats_bytes_written(pTcon, total_written); |
1da177e4 LT |
1146 | |
1147 | /* since the write may have blocked check these pointers again */ | |
3677db10 | 1148 | if ((file->f_path.dentry) && (file->f_path.dentry->d_inode)) { |
004c46b9 | 1149 | /*BB We could make this contingent on superblock ATIME flag too */ |
3677db10 SF |
1150 | /* file->f_path.dentry->d_inode->i_ctime = |
1151 | file->f_path.dentry->d_inode->i_mtime = CURRENT_TIME;*/ | |
1152 | if (total_written > 0) { | |
1153 | spin_lock(&file->f_path.dentry->d_inode->i_lock); | |
1154 | if (*poffset > file->f_path.dentry->d_inode->i_size) | |
1155 | i_size_write(file->f_path.dentry->d_inode, | |
1156 | *poffset); | |
1157 | spin_unlock(&file->f_path.dentry->d_inode->i_lock); | |
1da177e4 | 1158 | } |
3677db10 | 1159 | mark_inode_dirty_sync(file->f_path.dentry->d_inode); |
1da177e4 LT |
1160 | } |
1161 | FreeXid(xid); | |
1162 | return total_written; | |
1163 | } | |
1164 | ||
630f3f0c SF |
1165 | #ifdef CONFIG_CIFS_EXPERIMENTAL |
1166 | struct cifsFileInfo *find_readable_file(struct cifsInodeInfo *cifs_inode) | |
1167 | { | |
1168 | struct cifsFileInfo *open_file = NULL; | |
1169 | ||
1170 | read_lock(&GlobalSMBSeslock); | |
1171 | /* we could simply get the first_list_entry since write-only entries | |
1172 | are always at the end of the list but since the first entry might | |
1173 | have a close pending, we go through the whole list */ | |
1174 | list_for_each_entry(open_file, &cifs_inode->openFileList, flist) { | |
1175 | if (open_file->closePend) | |
1176 | continue; | |
1177 | if (open_file->pfile && ((open_file->pfile->f_flags & O_RDWR) || | |
1178 | (open_file->pfile->f_flags & O_RDONLY))) { | |
1179 | if (!open_file->invalidHandle) { | |
1180 | /* found a good file */ | |
1181 | /* lock it so it will not be closed on us */ | |
6ab409b5 | 1182 | cifsFileInfo_get(open_file); |
630f3f0c SF |
1183 | read_unlock(&GlobalSMBSeslock); |
1184 | return open_file; | |
1185 | } /* else might as well continue, and look for | |
1186 | another, or simply have the caller reopen it | |
1187 | again rather than trying to fix this handle */ | |
1188 | } else /* write only file */ | |
1189 | break; /* write only files are last so must be done */ | |
1190 | } | |
1191 | read_unlock(&GlobalSMBSeslock); | |
1192 | return NULL; | |
1193 | } | |
1194 | #endif | |
1195 | ||
dd99cd80 | 1196 | struct cifsFileInfo *find_writable_file(struct cifsInodeInfo *cifs_inode) |
6148a742 SF |
1197 | { |
1198 | struct cifsFileInfo *open_file; | |
2846d386 | 1199 | bool any_available = false; |
dd99cd80 | 1200 | int rc; |
6148a742 | 1201 | |
60808233 SF |
1202 | /* Having a null inode here (because mapping->host was set to zero by |
1203 | the VFS or MM) should not happen but we had reports of on oops (due to | |
1204 | it being zero) during stress testcases so we need to check for it */ | |
1205 | ||
fb8c4b14 | 1206 | if (cifs_inode == NULL) { |
b6b38f70 | 1207 | cERROR(1, "Null inode passed to cifs_writeable_file"); |
60808233 SF |
1208 | dump_stack(); |
1209 | return NULL; | |
1210 | } | |
1211 | ||
6148a742 | 1212 | read_lock(&GlobalSMBSeslock); |
9b22b0b7 | 1213 | refind_writable: |
6148a742 | 1214 | list_for_each_entry(open_file, &cifs_inode->openFileList, flist) { |
2846d386 JL |
1215 | if (open_file->closePend || |
1216 | (!any_available && open_file->pid != current->tgid)) | |
6148a742 | 1217 | continue; |
2846d386 | 1218 | |
6148a742 SF |
1219 | if (open_file->pfile && |
1220 | ((open_file->pfile->f_flags & O_RDWR) || | |
1221 | (open_file->pfile->f_flags & O_WRONLY))) { | |
6ab409b5 | 1222 | cifsFileInfo_get(open_file); |
9b22b0b7 SF |
1223 | |
1224 | if (!open_file->invalidHandle) { | |
1225 | /* found a good writable file */ | |
1226 | read_unlock(&GlobalSMBSeslock); | |
1227 | return open_file; | |
1228 | } | |
8840dee9 | 1229 | |
6148a742 | 1230 | read_unlock(&GlobalSMBSeslock); |
9b22b0b7 | 1231 | /* Had to unlock since following call can block */ |
4b18f2a9 | 1232 | rc = cifs_reopen_file(open_file->pfile, false); |
8840dee9 | 1233 | if (!rc) { |
9b22b0b7 SF |
1234 | if (!open_file->closePend) |
1235 | return open_file; | |
1236 | else { /* start over in case this was deleted */ | |
1237 | /* since the list could be modified */ | |
37c0eb46 | 1238 | read_lock(&GlobalSMBSeslock); |
6ab409b5 | 1239 | cifsFileInfo_put(open_file); |
9b22b0b7 | 1240 | goto refind_writable; |
37c0eb46 SF |
1241 | } |
1242 | } | |
9b22b0b7 SF |
1243 | |
1244 | /* if it fails, try another handle if possible - | |
1245 | (we can not do this if closePending since | |
1246 | loop could be modified - in which case we | |
1247 | have to start at the beginning of the list | |
1248 | again. Note that it would be bad | |
1249 | to hold up writepages here (rather than | |
1250 | in caller) with continuous retries */ | |
b6b38f70 | 1251 | cFYI(1, "wp failed on reopen file"); |
9b22b0b7 SF |
1252 | read_lock(&GlobalSMBSeslock); |
1253 | /* can not use this handle, no write | |
1254 | pending on this one after all */ | |
6ab409b5 | 1255 | cifsFileInfo_put(open_file); |
8840dee9 | 1256 | |
9b22b0b7 SF |
1257 | if (open_file->closePend) /* list could have changed */ |
1258 | goto refind_writable; | |
1259 | /* else we simply continue to the next entry. Thus | |
1260 | we do not loop on reopen errors. If we | |
1261 | can not reopen the file, for example if we | |
1262 | reconnected to a server with another client | |
1263 | racing to delete or lock the file we would not | |
1264 | make progress if we restarted before the beginning | |
1265 | of the loop here. */ | |
6148a742 SF |
1266 | } |
1267 | } | |
2846d386 JL |
1268 | /* couldn't find useable FH with same pid, try any available */ |
1269 | if (!any_available) { | |
1270 | any_available = true; | |
1271 | goto refind_writable; | |
1272 | } | |
6148a742 SF |
1273 | read_unlock(&GlobalSMBSeslock); |
1274 | return NULL; | |
1275 | } | |
1276 | ||
1da177e4 LT |
1277 | static int cifs_partialpagewrite(struct page *page, unsigned from, unsigned to) |
1278 | { | |
1279 | struct address_space *mapping = page->mapping; | |
1280 | loff_t offset = (loff_t)page->index << PAGE_CACHE_SHIFT; | |
1281 | char *write_data; | |
1282 | int rc = -EFAULT; | |
1283 | int bytes_written = 0; | |
1284 | struct cifs_sb_info *cifs_sb; | |
1285 | struct cifsTconInfo *pTcon; | |
1286 | struct inode *inode; | |
6148a742 | 1287 | struct cifsFileInfo *open_file; |
1da177e4 LT |
1288 | |
1289 | if (!mapping || !mapping->host) | |
1290 | return -EFAULT; | |
1291 | ||
1292 | inode = page->mapping->host; | |
1293 | cifs_sb = CIFS_SB(inode->i_sb); | |
1294 | pTcon = cifs_sb->tcon; | |
1295 | ||
1296 | offset += (loff_t)from; | |
1297 | write_data = kmap(page); | |
1298 | write_data += from; | |
1299 | ||
1300 | if ((to > PAGE_CACHE_SIZE) || (from > to)) { | |
1301 | kunmap(page); | |
1302 | return -EIO; | |
1303 | } | |
1304 | ||
1305 | /* racing with truncate? */ | |
1306 | if (offset > mapping->host->i_size) { | |
1307 | kunmap(page); | |
1308 | return 0; /* don't care */ | |
1309 | } | |
1310 | ||
1311 | /* check to make sure that we are not extending the file */ | |
1312 | if (mapping->host->i_size - offset < (loff_t)to) | |
fb8c4b14 | 1313 | to = (unsigned)(mapping->host->i_size - offset); |
1da177e4 | 1314 | |
6148a742 SF |
1315 | open_file = find_writable_file(CIFS_I(mapping->host)); |
1316 | if (open_file) { | |
1317 | bytes_written = cifs_write(open_file->pfile, write_data, | |
1318 | to-from, &offset); | |
6ab409b5 | 1319 | cifsFileInfo_put(open_file); |
1da177e4 | 1320 | /* Does mm or vfs already set times? */ |
6148a742 | 1321 | inode->i_atime = inode->i_mtime = current_fs_time(inode->i_sb); |
bb5a9a04 | 1322 | if ((bytes_written > 0) && (offset)) |
6148a742 | 1323 | rc = 0; |
bb5a9a04 SF |
1324 | else if (bytes_written < 0) |
1325 | rc = bytes_written; | |
6148a742 | 1326 | } else { |
b6b38f70 | 1327 | cFYI(1, "No writeable filehandles for inode"); |
1da177e4 LT |
1328 | rc = -EIO; |
1329 | } | |
1330 | ||
1331 | kunmap(page); | |
1332 | return rc; | |
1333 | } | |
1334 | ||
1da177e4 | 1335 | static int cifs_writepages(struct address_space *mapping, |
37c0eb46 | 1336 | struct writeback_control *wbc) |
1da177e4 | 1337 | { |
37c0eb46 SF |
1338 | struct backing_dev_info *bdi = mapping->backing_dev_info; |
1339 | unsigned int bytes_to_write; | |
1340 | unsigned int bytes_written; | |
1341 | struct cifs_sb_info *cifs_sb; | |
1342 | int done = 0; | |
111ebb6e | 1343 | pgoff_t end; |
37c0eb46 | 1344 | pgoff_t index; |
fb8c4b14 SF |
1345 | int range_whole = 0; |
1346 | struct kvec *iov; | |
84d2f07e | 1347 | int len; |
37c0eb46 SF |
1348 | int n_iov = 0; |
1349 | pgoff_t next; | |
1350 | int nr_pages; | |
1351 | __u64 offset = 0; | |
23e7dd7d | 1352 | struct cifsFileInfo *open_file; |
fbec9ab9 | 1353 | struct cifsInodeInfo *cifsi = CIFS_I(mapping->host); |
37c0eb46 SF |
1354 | struct page *page; |
1355 | struct pagevec pvec; | |
1356 | int rc = 0; | |
1357 | int scanned = 0; | |
fbec9ab9 | 1358 | int xid, long_op; |
1da177e4 | 1359 | |
37c0eb46 | 1360 | cifs_sb = CIFS_SB(mapping->host->i_sb); |
50c2f753 | 1361 | |
37c0eb46 SF |
1362 | /* |
1363 | * If wsize is smaller that the page cache size, default to writing | |
1364 | * one page at a time via cifs_writepage | |
1365 | */ | |
1366 | if (cifs_sb->wsize < PAGE_CACHE_SIZE) | |
1367 | return generic_writepages(mapping, wbc); | |
1368 | ||
fb8c4b14 SF |
1369 | if ((cifs_sb->tcon->ses) && (cifs_sb->tcon->ses->server)) |
1370 | if (cifs_sb->tcon->ses->server->secMode & | |
1371 | (SECMODE_SIGN_REQUIRED | SECMODE_SIGN_ENABLED)) | |
1372 | if (!experimEnabled) | |
60808233 | 1373 | return generic_writepages(mapping, wbc); |
4a77118c | 1374 | |
9a0c8230 | 1375 | iov = kmalloc(32 * sizeof(struct kvec), GFP_KERNEL); |
fb8c4b14 | 1376 | if (iov == NULL) |
9a0c8230 SF |
1377 | return generic_writepages(mapping, wbc); |
1378 | ||
1379 | ||
37c0eb46 SF |
1380 | /* |
1381 | * BB: Is this meaningful for a non-block-device file system? | |
1382 | * If it is, we should test it again after we do I/O | |
1383 | */ | |
1384 | if (wbc->nonblocking && bdi_write_congested(bdi)) { | |
1385 | wbc->encountered_congestion = 1; | |
9a0c8230 | 1386 | kfree(iov); |
37c0eb46 SF |
1387 | return 0; |
1388 | } | |
1389 | ||
1da177e4 LT |
1390 | xid = GetXid(); |
1391 | ||
37c0eb46 | 1392 | pagevec_init(&pvec, 0); |
111ebb6e | 1393 | if (wbc->range_cyclic) { |
37c0eb46 | 1394 | index = mapping->writeback_index; /* Start from prev offset */ |
111ebb6e OH |
1395 | end = -1; |
1396 | } else { | |
1397 | index = wbc->range_start >> PAGE_CACHE_SHIFT; | |
1398 | end = wbc->range_end >> PAGE_CACHE_SHIFT; | |
1399 | if (wbc->range_start == 0 && wbc->range_end == LLONG_MAX) | |
1400 | range_whole = 1; | |
37c0eb46 SF |
1401 | scanned = 1; |
1402 | } | |
1403 | retry: | |
1404 | while (!done && (index <= end) && | |
1405 | (nr_pages = pagevec_lookup_tag(&pvec, mapping, &index, | |
1406 | PAGECACHE_TAG_DIRTY, | |
1407 | min(end - index, (pgoff_t)PAGEVEC_SIZE - 1) + 1))) { | |
1408 | int first; | |
1409 | unsigned int i; | |
1410 | ||
37c0eb46 SF |
1411 | first = -1; |
1412 | next = 0; | |
1413 | n_iov = 0; | |
1414 | bytes_to_write = 0; | |
1415 | ||
1416 | for (i = 0; i < nr_pages; i++) { | |
1417 | page = pvec.pages[i]; | |
1418 | /* | |
1419 | * At this point we hold neither mapping->tree_lock nor | |
1420 | * lock on the page itself: the page may be truncated or | |
1421 | * invalidated (changing page->mapping to NULL), or even | |
1422 | * swizzled back from swapper_space to tmpfs file | |
1423 | * mapping | |
1424 | */ | |
1425 | ||
1426 | if (first < 0) | |
1427 | lock_page(page); | |
529ae9aa | 1428 | else if (!trylock_page(page)) |
37c0eb46 SF |
1429 | break; |
1430 | ||
1431 | if (unlikely(page->mapping != mapping)) { | |
1432 | unlock_page(page); | |
1433 | break; | |
1434 | } | |
1435 | ||
111ebb6e | 1436 | if (!wbc->range_cyclic && page->index > end) { |
37c0eb46 SF |
1437 | done = 1; |
1438 | unlock_page(page); | |
1439 | break; | |
1440 | } | |
1441 | ||
1442 | if (next && (page->index != next)) { | |
1443 | /* Not next consecutive page */ | |
1444 | unlock_page(page); | |
1445 | break; | |
1446 | } | |
1447 | ||
1448 | if (wbc->sync_mode != WB_SYNC_NONE) | |
1449 | wait_on_page_writeback(page); | |
1450 | ||
1451 | if (PageWriteback(page) || | |
cb876f45 | 1452 | !clear_page_dirty_for_io(page)) { |
37c0eb46 SF |
1453 | unlock_page(page); |
1454 | break; | |
1455 | } | |
84d2f07e | 1456 | |
cb876f45 LT |
1457 | /* |
1458 | * This actually clears the dirty bit in the radix tree. | |
1459 | * See cifs_writepage() for more commentary. | |
1460 | */ | |
1461 | set_page_writeback(page); | |
1462 | ||
84d2f07e SF |
1463 | if (page_offset(page) >= mapping->host->i_size) { |
1464 | done = 1; | |
1465 | unlock_page(page); | |
cb876f45 | 1466 | end_page_writeback(page); |
84d2f07e SF |
1467 | break; |
1468 | } | |
1469 | ||
37c0eb46 SF |
1470 | /* |
1471 | * BB can we get rid of this? pages are held by pvec | |
1472 | */ | |
1473 | page_cache_get(page); | |
1474 | ||
84d2f07e SF |
1475 | len = min(mapping->host->i_size - page_offset(page), |
1476 | (loff_t)PAGE_CACHE_SIZE); | |
1477 | ||
37c0eb46 SF |
1478 | /* reserve iov[0] for the smb header */ |
1479 | n_iov++; | |
1480 | iov[n_iov].iov_base = kmap(page); | |
84d2f07e SF |
1481 | iov[n_iov].iov_len = len; |
1482 | bytes_to_write += len; | |
37c0eb46 SF |
1483 | |
1484 | if (first < 0) { | |
1485 | first = i; | |
1486 | offset = page_offset(page); | |
1487 | } | |
1488 | next = page->index + 1; | |
1489 | if (bytes_to_write + PAGE_CACHE_SIZE > cifs_sb->wsize) | |
1490 | break; | |
1491 | } | |
1492 | if (n_iov) { | |
23e7dd7d SF |
1493 | /* Search for a writable handle every time we call |
1494 | * CIFSSMBWrite2. We can't rely on the last handle | |
1495 | * we used to still be valid | |
1496 | */ | |
1497 | open_file = find_writable_file(CIFS_I(mapping->host)); | |
1498 | if (!open_file) { | |
b6b38f70 | 1499 | cERROR(1, "No writable handles for inode"); |
23e7dd7d | 1500 | rc = -EBADF; |
1047abc1 | 1501 | } else { |
fbec9ab9 | 1502 | long_op = cifs_write_timeout(cifsi, offset); |
23e7dd7d SF |
1503 | rc = CIFSSMBWrite2(xid, cifs_sb->tcon, |
1504 | open_file->netfid, | |
1505 | bytes_to_write, offset, | |
1506 | &bytes_written, iov, n_iov, | |
fbec9ab9 | 1507 | long_op); |
6ab409b5 | 1508 | cifsFileInfo_put(open_file); |
fbec9ab9 JL |
1509 | cifs_update_eof(cifsi, offset, bytes_written); |
1510 | ||
23e7dd7d | 1511 | if (rc || bytes_written < bytes_to_write) { |
b6b38f70 JP |
1512 | cERROR(1, "Write2 ret %d, wrote %d", |
1513 | rc, bytes_written); | |
23e7dd7d SF |
1514 | /* BB what if continued retry is |
1515 | requested via mount flags? */ | |
cea21805 JL |
1516 | if (rc == -ENOSPC) |
1517 | set_bit(AS_ENOSPC, &mapping->flags); | |
1518 | else | |
1519 | set_bit(AS_EIO, &mapping->flags); | |
23e7dd7d SF |
1520 | } else { |
1521 | cifs_stats_bytes_written(cifs_sb->tcon, | |
1522 | bytes_written); | |
1523 | } | |
37c0eb46 SF |
1524 | } |
1525 | for (i = 0; i < n_iov; i++) { | |
1526 | page = pvec.pages[first + i]; | |
eb9bdaa3 SF |
1527 | /* Should we also set page error on |
1528 | success rc but too little data written? */ | |
1529 | /* BB investigate retry logic on temporary | |
1530 | server crash cases and how recovery works | |
fb8c4b14 SF |
1531 | when page marked as error */ |
1532 | if (rc) | |
eb9bdaa3 | 1533 | SetPageError(page); |
37c0eb46 SF |
1534 | kunmap(page); |
1535 | unlock_page(page); | |
cb876f45 | 1536 | end_page_writeback(page); |
37c0eb46 SF |
1537 | page_cache_release(page); |
1538 | } | |
1539 | if ((wbc->nr_to_write -= n_iov) <= 0) | |
1540 | done = 1; | |
1541 | index = next; | |
b066a48c DK |
1542 | } else |
1543 | /* Need to re-find the pages we skipped */ | |
1544 | index = pvec.pages[0]->index + 1; | |
1545 | ||
37c0eb46 SF |
1546 | pagevec_release(&pvec); |
1547 | } | |
1548 | if (!scanned && !done) { | |
1549 | /* | |
1550 | * We hit the last page and there is more work to be done: wrap | |
1551 | * back to the start of the file | |
1552 | */ | |
1553 | scanned = 1; | |
1554 | index = 0; | |
1555 | goto retry; | |
1556 | } | |
111ebb6e | 1557 | if (wbc->range_cyclic || (range_whole && wbc->nr_to_write > 0)) |
37c0eb46 SF |
1558 | mapping->writeback_index = index; |
1559 | ||
1da177e4 | 1560 | FreeXid(xid); |
9a0c8230 | 1561 | kfree(iov); |
1da177e4 LT |
1562 | return rc; |
1563 | } | |
1da177e4 | 1564 | |
fb8c4b14 | 1565 | static int cifs_writepage(struct page *page, struct writeback_control *wbc) |
1da177e4 LT |
1566 | { |
1567 | int rc = -EFAULT; | |
1568 | int xid; | |
1569 | ||
1570 | xid = GetXid(); | |
1571 | /* BB add check for wbc flags */ | |
1572 | page_cache_get(page); | |
ad7a2926 | 1573 | if (!PageUptodate(page)) |
b6b38f70 | 1574 | cFYI(1, "ppw - page not up to date"); |
cb876f45 LT |
1575 | |
1576 | /* | |
1577 | * Set the "writeback" flag, and clear "dirty" in the radix tree. | |
1578 | * | |
1579 | * A writepage() implementation always needs to do either this, | |
1580 | * or re-dirty the page with "redirty_page_for_writepage()" in | |
1581 | * the case of a failure. | |
1582 | * | |
1583 | * Just unlocking the page will cause the radix tree tag-bits | |
1584 | * to fail to update with the state of the page correctly. | |
1585 | */ | |
fb8c4b14 | 1586 | set_page_writeback(page); |
1da177e4 LT |
1587 | rc = cifs_partialpagewrite(page, 0, PAGE_CACHE_SIZE); |
1588 | SetPageUptodate(page); /* BB add check for error and Clearuptodate? */ | |
1589 | unlock_page(page); | |
cb876f45 LT |
1590 | end_page_writeback(page); |
1591 | page_cache_release(page); | |
1da177e4 LT |
1592 | FreeXid(xid); |
1593 | return rc; | |
1594 | } | |
1595 | ||
d9414774 NP |
1596 | static int cifs_write_end(struct file *file, struct address_space *mapping, |
1597 | loff_t pos, unsigned len, unsigned copied, | |
1598 | struct page *page, void *fsdata) | |
1da177e4 | 1599 | { |
d9414774 NP |
1600 | int rc; |
1601 | struct inode *inode = mapping->host; | |
1da177e4 | 1602 | |
b6b38f70 JP |
1603 | cFYI(1, "write_end for page %p from pos %lld with %d bytes", |
1604 | page, pos, copied); | |
d9414774 | 1605 | |
a98ee8c1 JL |
1606 | if (PageChecked(page)) { |
1607 | if (copied == len) | |
1608 | SetPageUptodate(page); | |
1609 | ClearPageChecked(page); | |
1610 | } else if (!PageUptodate(page) && copied == PAGE_CACHE_SIZE) | |
d9414774 | 1611 | SetPageUptodate(page); |
ad7a2926 | 1612 | |
1da177e4 | 1613 | if (!PageUptodate(page)) { |
d9414774 NP |
1614 | char *page_data; |
1615 | unsigned offset = pos & (PAGE_CACHE_SIZE - 1); | |
1616 | int xid; | |
1617 | ||
1618 | xid = GetXid(); | |
1da177e4 LT |
1619 | /* this is probably better than directly calling |
1620 | partialpage_write since in this function the file handle is | |
1621 | known which we might as well leverage */ | |
1622 | /* BB check if anything else missing out of ppw | |
1623 | such as updating last write time */ | |
1624 | page_data = kmap(page); | |
d9414774 NP |
1625 | rc = cifs_write(file, page_data + offset, copied, &pos); |
1626 | /* if (rc < 0) should we set writebehind rc? */ | |
1da177e4 | 1627 | kunmap(page); |
d9414774 NP |
1628 | |
1629 | FreeXid(xid); | |
fb8c4b14 | 1630 | } else { |
d9414774 NP |
1631 | rc = copied; |
1632 | pos += copied; | |
1da177e4 LT |
1633 | set_page_dirty(page); |
1634 | } | |
1635 | ||
d9414774 NP |
1636 | if (rc > 0) { |
1637 | spin_lock(&inode->i_lock); | |
1638 | if (pos > inode->i_size) | |
1639 | i_size_write(inode, pos); | |
1640 | spin_unlock(&inode->i_lock); | |
1641 | } | |
1642 | ||
1643 | unlock_page(page); | |
1644 | page_cache_release(page); | |
1645 | ||
1da177e4 LT |
1646 | return rc; |
1647 | } | |
1648 | ||
7ea80859 | 1649 | int cifs_fsync(struct file *file, int datasync) |
1da177e4 LT |
1650 | { |
1651 | int xid; | |
1652 | int rc = 0; | |
b298f223 SF |
1653 | struct cifsTconInfo *tcon; |
1654 | struct cifsFileInfo *smbfile = | |
1655 | (struct cifsFileInfo *)file->private_data; | |
e6a00296 | 1656 | struct inode *inode = file->f_path.dentry->d_inode; |
1da177e4 LT |
1657 | |
1658 | xid = GetXid(); | |
1659 | ||
b6b38f70 | 1660 | cFYI(1, "Sync file - name: %s datasync: 0x%x", |
7ea80859 | 1661 | file->f_path.dentry->d_name.name, datasync); |
50c2f753 | 1662 | |
cea21805 JL |
1663 | rc = filemap_write_and_wait(inode->i_mapping); |
1664 | if (rc == 0) { | |
1665 | rc = CIFS_I(inode)->write_behind_rc; | |
1da177e4 | 1666 | CIFS_I(inode)->write_behind_rc = 0; |
b298f223 | 1667 | tcon = CIFS_SB(inode->i_sb)->tcon; |
be652445 | 1668 | if (!rc && tcon && smbfile && |
4717bed6 | 1669 | !(CIFS_SB(inode->i_sb)->mnt_cifs_flags & CIFS_MOUNT_NOSSYNC)) |
b298f223 | 1670 | rc = CIFSSMBFlush(xid, tcon, smbfile->netfid); |
cea21805 | 1671 | } |
b298f223 | 1672 | |
1da177e4 LT |
1673 | FreeXid(xid); |
1674 | return rc; | |
1675 | } | |
1676 | ||
3978d717 | 1677 | /* static void cifs_sync_page(struct page *page) |
1da177e4 LT |
1678 | { |
1679 | struct address_space *mapping; | |
1680 | struct inode *inode; | |
1681 | unsigned long index = page->index; | |
1682 | unsigned int rpages = 0; | |
1683 | int rc = 0; | |
1684 | ||
f19159dc | 1685 | cFYI(1, "sync page %p", page); |
1da177e4 LT |
1686 | mapping = page->mapping; |
1687 | if (!mapping) | |
1688 | return 0; | |
1689 | inode = mapping->host; | |
1690 | if (!inode) | |
3978d717 | 1691 | return; */ |
1da177e4 | 1692 | |
fb8c4b14 | 1693 | /* fill in rpages then |
1da177e4 LT |
1694 | result = cifs_pagein_inode(inode, index, rpages); */ /* BB finish */ |
1695 | ||
b6b38f70 | 1696 | /* cFYI(1, "rpages is %d for sync page of Index %ld", rpages, index); |
1da177e4 | 1697 | |
3978d717 | 1698 | #if 0 |
1da177e4 LT |
1699 | if (rc < 0) |
1700 | return rc; | |
1701 | return 0; | |
3978d717 | 1702 | #endif |
1da177e4 LT |
1703 | } */ |
1704 | ||
1705 | /* | |
1706 | * As file closes, flush all cached write data for this inode checking | |
1707 | * for write behind errors. | |
1708 | */ | |
75e1fcc0 | 1709 | int cifs_flush(struct file *file, fl_owner_t id) |
1da177e4 | 1710 | { |
fb8c4b14 | 1711 | struct inode *inode = file->f_path.dentry->d_inode; |
1da177e4 LT |
1712 | int rc = 0; |
1713 | ||
1714 | /* Rather than do the steps manually: | |
1715 | lock the inode for writing | |
1716 | loop through pages looking for write behind data (dirty pages) | |
1717 | coalesce into contiguous 16K (or smaller) chunks to write to server | |
1718 | send to server (prefer in parallel) | |
1719 | deal with writebehind errors | |
1720 | unlock inode for writing | |
1721 | filemapfdatawrite appears easier for the time being */ | |
1722 | ||
1723 | rc = filemap_fdatawrite(inode->i_mapping); | |
cea21805 JL |
1724 | /* reset wb rc if we were able to write out dirty pages */ |
1725 | if (!rc) { | |
1726 | rc = CIFS_I(inode)->write_behind_rc; | |
1da177e4 | 1727 | CIFS_I(inode)->write_behind_rc = 0; |
cea21805 | 1728 | } |
50c2f753 | 1729 | |
b6b38f70 | 1730 | cFYI(1, "Flush inode %p file %p rc %d", inode, file, rc); |
1da177e4 LT |
1731 | |
1732 | return rc; | |
1733 | } | |
1734 | ||
1735 | ssize_t cifs_user_read(struct file *file, char __user *read_data, | |
1736 | size_t read_size, loff_t *poffset) | |
1737 | { | |
1738 | int rc = -EACCES; | |
1739 | unsigned int bytes_read = 0; | |
1740 | unsigned int total_read = 0; | |
1741 | unsigned int current_read_size; | |
1742 | struct cifs_sb_info *cifs_sb; | |
1743 | struct cifsTconInfo *pTcon; | |
1744 | int xid; | |
1745 | struct cifsFileInfo *open_file; | |
1746 | char *smb_read_data; | |
1747 | char __user *current_offset; | |
1748 | struct smb_com_read_rsp *pSMBr; | |
1749 | ||
1750 | xid = GetXid(); | |
e6a00296 | 1751 | cifs_sb = CIFS_SB(file->f_path.dentry->d_sb); |
1da177e4 LT |
1752 | pTcon = cifs_sb->tcon; |
1753 | ||
1754 | if (file->private_data == NULL) { | |
0f3bc09e | 1755 | rc = -EBADF; |
1da177e4 | 1756 | FreeXid(xid); |
0f3bc09e | 1757 | return rc; |
1da177e4 LT |
1758 | } |
1759 | open_file = (struct cifsFileInfo *)file->private_data; | |
1760 | ||
ad7a2926 | 1761 | if ((file->f_flags & O_ACCMODE) == O_WRONLY) |
b6b38f70 | 1762 | cFYI(1, "attempting read on write only file instance"); |
ad7a2926 | 1763 | |
1da177e4 LT |
1764 | for (total_read = 0, current_offset = read_data; |
1765 | read_size > total_read; | |
1766 | total_read += bytes_read, current_offset += bytes_read) { | |
fb8c4b14 | 1767 | current_read_size = min_t(const int, read_size - total_read, |
1da177e4 LT |
1768 | cifs_sb->rsize); |
1769 | rc = -EAGAIN; | |
1770 | smb_read_data = NULL; | |
1771 | while (rc == -EAGAIN) { | |
ec637e3f | 1772 | int buf_type = CIFS_NO_BUFFER; |
fb8c4b14 | 1773 | if ((open_file->invalidHandle) && |
1da177e4 | 1774 | (!open_file->closePend)) { |
4b18f2a9 | 1775 | rc = cifs_reopen_file(file, true); |
1da177e4 LT |
1776 | if (rc != 0) |
1777 | break; | |
1778 | } | |
bfa0d75a | 1779 | rc = CIFSSMBRead(xid, pTcon, |
ec637e3f SF |
1780 | open_file->netfid, |
1781 | current_read_size, *poffset, | |
1782 | &bytes_read, &smb_read_data, | |
1783 | &buf_type); | |
1da177e4 | 1784 | pSMBr = (struct smb_com_read_rsp *)smb_read_data; |
1da177e4 | 1785 | if (smb_read_data) { |
93544cc6 SF |
1786 | if (copy_to_user(current_offset, |
1787 | smb_read_data + | |
1788 | 4 /* RFC1001 length field */ + | |
1789 | le16_to_cpu(pSMBr->DataOffset), | |
ad7a2926 | 1790 | bytes_read)) |
93544cc6 | 1791 | rc = -EFAULT; |
93544cc6 | 1792 | |
fb8c4b14 | 1793 | if (buf_type == CIFS_SMALL_BUFFER) |
ec637e3f | 1794 | cifs_small_buf_release(smb_read_data); |
fb8c4b14 | 1795 | else if (buf_type == CIFS_LARGE_BUFFER) |
ec637e3f | 1796 | cifs_buf_release(smb_read_data); |
1da177e4 LT |
1797 | smb_read_data = NULL; |
1798 | } | |
1799 | } | |
1800 | if (rc || (bytes_read == 0)) { | |
1801 | if (total_read) { | |
1802 | break; | |
1803 | } else { | |
1804 | FreeXid(xid); | |
1805 | return rc; | |
1806 | } | |
1807 | } else { | |
a4544347 | 1808 | cifs_stats_bytes_read(pTcon, bytes_read); |
1da177e4 LT |
1809 | *poffset += bytes_read; |
1810 | } | |
1811 | } | |
1812 | FreeXid(xid); | |
1813 | return total_read; | |
1814 | } | |
1815 | ||
1816 | ||
1817 | static ssize_t cifs_read(struct file *file, char *read_data, size_t read_size, | |
1818 | loff_t *poffset) | |
1819 | { | |
1820 | int rc = -EACCES; | |
1821 | unsigned int bytes_read = 0; | |
1822 | unsigned int total_read; | |
1823 | unsigned int current_read_size; | |
1824 | struct cifs_sb_info *cifs_sb; | |
1825 | struct cifsTconInfo *pTcon; | |
1826 | int xid; | |
1827 | char *current_offset; | |
1828 | struct cifsFileInfo *open_file; | |
ec637e3f | 1829 | int buf_type = CIFS_NO_BUFFER; |
1da177e4 LT |
1830 | |
1831 | xid = GetXid(); | |
e6a00296 | 1832 | cifs_sb = CIFS_SB(file->f_path.dentry->d_sb); |
1da177e4 LT |
1833 | pTcon = cifs_sb->tcon; |
1834 | ||
1835 | if (file->private_data == NULL) { | |
0f3bc09e | 1836 | rc = -EBADF; |
1da177e4 | 1837 | FreeXid(xid); |
0f3bc09e | 1838 | return rc; |
1da177e4 LT |
1839 | } |
1840 | open_file = (struct cifsFileInfo *)file->private_data; | |
1841 | ||
1842 | if ((file->f_flags & O_ACCMODE) == O_WRONLY) | |
b6b38f70 | 1843 | cFYI(1, "attempting read on write only file instance"); |
1da177e4 | 1844 | |
fb8c4b14 | 1845 | for (total_read = 0, current_offset = read_data; |
1da177e4 LT |
1846 | read_size > total_read; |
1847 | total_read += bytes_read, current_offset += bytes_read) { | |
1848 | current_read_size = min_t(const int, read_size - total_read, | |
1849 | cifs_sb->rsize); | |
f9f5c817 SF |
1850 | /* For windows me and 9x we do not want to request more |
1851 | than it negotiated since it will refuse the read then */ | |
fb8c4b14 | 1852 | if ((pTcon->ses) && |
f9f5c817 SF |
1853 | !(pTcon->ses->capabilities & CAP_LARGE_FILES)) { |
1854 | current_read_size = min_t(const int, current_read_size, | |
1855 | pTcon->ses->server->maxBuf - 128); | |
1856 | } | |
1da177e4 LT |
1857 | rc = -EAGAIN; |
1858 | while (rc == -EAGAIN) { | |
fb8c4b14 | 1859 | if ((open_file->invalidHandle) && |
1da177e4 | 1860 | (!open_file->closePend)) { |
4b18f2a9 | 1861 | rc = cifs_reopen_file(file, true); |
1da177e4 LT |
1862 | if (rc != 0) |
1863 | break; | |
1864 | } | |
bfa0d75a | 1865 | rc = CIFSSMBRead(xid, pTcon, |
ec637e3f SF |
1866 | open_file->netfid, |
1867 | current_read_size, *poffset, | |
1868 | &bytes_read, ¤t_offset, | |
1869 | &buf_type); | |
1da177e4 LT |
1870 | } |
1871 | if (rc || (bytes_read == 0)) { | |
1872 | if (total_read) { | |
1873 | break; | |
1874 | } else { | |
1875 | FreeXid(xid); | |
1876 | return rc; | |
1877 | } | |
1878 | } else { | |
a4544347 | 1879 | cifs_stats_bytes_read(pTcon, total_read); |
1da177e4 LT |
1880 | *poffset += bytes_read; |
1881 | } | |
1882 | } | |
1883 | FreeXid(xid); | |
1884 | return total_read; | |
1885 | } | |
1886 | ||
1887 | int cifs_file_mmap(struct file *file, struct vm_area_struct *vma) | |
1888 | { | |
1da177e4 LT |
1889 | int rc, xid; |
1890 | ||
1891 | xid = GetXid(); | |
abab095d | 1892 | rc = cifs_revalidate_file(file); |
1da177e4 | 1893 | if (rc) { |
b6b38f70 | 1894 | cFYI(1, "Validation prior to mmap failed, error=%d", rc); |
1da177e4 LT |
1895 | FreeXid(xid); |
1896 | return rc; | |
1897 | } | |
1898 | rc = generic_file_mmap(file, vma); | |
1899 | FreeXid(xid); | |
1900 | return rc; | |
1901 | } | |
1902 | ||
1903 | ||
fb8c4b14 | 1904 | static void cifs_copy_cache_pages(struct address_space *mapping, |
315e995c | 1905 | struct list_head *pages, int bytes_read, char *data) |
1da177e4 LT |
1906 | { |
1907 | struct page *page; | |
1908 | char *target; | |
1909 | ||
1910 | while (bytes_read > 0) { | |
1911 | if (list_empty(pages)) | |
1912 | break; | |
1913 | ||
1914 | page = list_entry(pages->prev, struct page, lru); | |
1915 | list_del(&page->lru); | |
1916 | ||
315e995c | 1917 | if (add_to_page_cache_lru(page, mapping, page->index, |
1da177e4 LT |
1918 | GFP_KERNEL)) { |
1919 | page_cache_release(page); | |
b6b38f70 | 1920 | cFYI(1, "Add page cache failed"); |
3079ca62 SF |
1921 | data += PAGE_CACHE_SIZE; |
1922 | bytes_read -= PAGE_CACHE_SIZE; | |
1da177e4 LT |
1923 | continue; |
1924 | } | |
06b43672 | 1925 | page_cache_release(page); |
1da177e4 | 1926 | |
fb8c4b14 | 1927 | target = kmap_atomic(page, KM_USER0); |
1da177e4 LT |
1928 | |
1929 | if (PAGE_CACHE_SIZE > bytes_read) { | |
1930 | memcpy(target, data, bytes_read); | |
1931 | /* zero the tail end of this partial page */ | |
fb8c4b14 | 1932 | memset(target + bytes_read, 0, |
1da177e4 LT |
1933 | PAGE_CACHE_SIZE - bytes_read); |
1934 | bytes_read = 0; | |
1935 | } else { | |
1936 | memcpy(target, data, PAGE_CACHE_SIZE); | |
1937 | bytes_read -= PAGE_CACHE_SIZE; | |
1938 | } | |
1939 | kunmap_atomic(target, KM_USER0); | |
1940 | ||
1941 | flush_dcache_page(page); | |
1942 | SetPageUptodate(page); | |
1943 | unlock_page(page); | |
1da177e4 LT |
1944 | data += PAGE_CACHE_SIZE; |
1945 | } | |
1946 | return; | |
1947 | } | |
1948 | ||
1949 | static int cifs_readpages(struct file *file, struct address_space *mapping, | |
1950 | struct list_head *page_list, unsigned num_pages) | |
1951 | { | |
1952 | int rc = -EACCES; | |
1953 | int xid; | |
1954 | loff_t offset; | |
1955 | struct page *page; | |
1956 | struct cifs_sb_info *cifs_sb; | |
1957 | struct cifsTconInfo *pTcon; | |
2c2130e1 | 1958 | unsigned int bytes_read = 0; |
fb8c4b14 | 1959 | unsigned int read_size, i; |
1da177e4 LT |
1960 | char *smb_read_data = NULL; |
1961 | struct smb_com_read_rsp *pSMBr; | |
1da177e4 | 1962 | struct cifsFileInfo *open_file; |
ec637e3f | 1963 | int buf_type = CIFS_NO_BUFFER; |
1da177e4 LT |
1964 | |
1965 | xid = GetXid(); | |
1966 | if (file->private_data == NULL) { | |
0f3bc09e | 1967 | rc = -EBADF; |
1da177e4 | 1968 | FreeXid(xid); |
0f3bc09e | 1969 | return rc; |
1da177e4 LT |
1970 | } |
1971 | open_file = (struct cifsFileInfo *)file->private_data; | |
e6a00296 | 1972 | cifs_sb = CIFS_SB(file->f_path.dentry->d_sb); |
1da177e4 | 1973 | pTcon = cifs_sb->tcon; |
bfa0d75a | 1974 | |
f19159dc | 1975 | cFYI(DBG2, "rpages: num pages %d", num_pages); |
1da177e4 LT |
1976 | for (i = 0; i < num_pages; ) { |
1977 | unsigned contig_pages; | |
1978 | struct page *tmp_page; | |
1979 | unsigned long expected_index; | |
1980 | ||
1981 | if (list_empty(page_list)) | |
1982 | break; | |
1983 | ||
1984 | page = list_entry(page_list->prev, struct page, lru); | |
1985 | offset = (loff_t)page->index << PAGE_CACHE_SHIFT; | |
1986 | ||
1987 | /* count adjacent pages that we will read into */ | |
1988 | contig_pages = 0; | |
fb8c4b14 | 1989 | expected_index = |
1da177e4 | 1990 | list_entry(page_list->prev, struct page, lru)->index; |
fb8c4b14 | 1991 | list_for_each_entry_reverse(tmp_page, page_list, lru) { |
1da177e4 LT |
1992 | if (tmp_page->index == expected_index) { |
1993 | contig_pages++; | |
1994 | expected_index++; | |
1995 | } else | |
fb8c4b14 | 1996 | break; |
1da177e4 LT |
1997 | } |
1998 | if (contig_pages + i > num_pages) | |
1999 | contig_pages = num_pages - i; | |
2000 | ||
2001 | /* for reads over a certain size could initiate async | |
2002 | read ahead */ | |
2003 | ||
2004 | read_size = contig_pages * PAGE_CACHE_SIZE; | |
2005 | /* Read size needs to be in multiples of one page */ | |
2006 | read_size = min_t(const unsigned int, read_size, | |
2007 | cifs_sb->rsize & PAGE_CACHE_MASK); | |
b6b38f70 JP |
2008 | cFYI(DBG2, "rpages: read size 0x%x contiguous pages %d", |
2009 | read_size, contig_pages); | |
1da177e4 LT |
2010 | rc = -EAGAIN; |
2011 | while (rc == -EAGAIN) { | |
fb8c4b14 | 2012 | if ((open_file->invalidHandle) && |
1da177e4 | 2013 | (!open_file->closePend)) { |
4b18f2a9 | 2014 | rc = cifs_reopen_file(file, true); |
1da177e4 LT |
2015 | if (rc != 0) |
2016 | break; | |
2017 | } | |
2018 | ||
bfa0d75a | 2019 | rc = CIFSSMBRead(xid, pTcon, |
ec637e3f SF |
2020 | open_file->netfid, |
2021 | read_size, offset, | |
2022 | &bytes_read, &smb_read_data, | |
2023 | &buf_type); | |
a9d02ad4 | 2024 | /* BB more RC checks ? */ |
fb8c4b14 | 2025 | if (rc == -EAGAIN) { |
1da177e4 | 2026 | if (smb_read_data) { |
fb8c4b14 | 2027 | if (buf_type == CIFS_SMALL_BUFFER) |
ec637e3f | 2028 | cifs_small_buf_release(smb_read_data); |
fb8c4b14 | 2029 | else if (buf_type == CIFS_LARGE_BUFFER) |
ec637e3f | 2030 | cifs_buf_release(smb_read_data); |
1da177e4 LT |
2031 | smb_read_data = NULL; |
2032 | } | |
2033 | } | |
2034 | } | |
2035 | if ((rc < 0) || (smb_read_data == NULL)) { | |
b6b38f70 | 2036 | cFYI(1, "Read error in readpages: %d", rc); |
1da177e4 LT |
2037 | break; |
2038 | } else if (bytes_read > 0) { | |
6f88cc2e | 2039 | task_io_account_read(bytes_read); |
1da177e4 LT |
2040 | pSMBr = (struct smb_com_read_rsp *)smb_read_data; |
2041 | cifs_copy_cache_pages(mapping, page_list, bytes_read, | |
2042 | smb_read_data + 4 /* RFC1001 hdr */ + | |
315e995c | 2043 | le16_to_cpu(pSMBr->DataOffset)); |
1da177e4 LT |
2044 | |
2045 | i += bytes_read >> PAGE_CACHE_SHIFT; | |
a4544347 | 2046 | cifs_stats_bytes_read(pTcon, bytes_read); |
2c2130e1 | 2047 | if ((bytes_read & PAGE_CACHE_MASK) != bytes_read) { |
1da177e4 LT |
2048 | i++; /* account for partial page */ |
2049 | ||
fb8c4b14 | 2050 | /* server copy of file can have smaller size |
1da177e4 | 2051 | than client */ |
fb8c4b14 SF |
2052 | /* BB do we need to verify this common case ? |
2053 | this case is ok - if we are at server EOF | |
1da177e4 LT |
2054 | we will hit it on next read */ |
2055 | ||
05ac9d4b | 2056 | /* break; */ |
1da177e4 LT |
2057 | } |
2058 | } else { | |
b6b38f70 | 2059 | cFYI(1, "No bytes read (%d) at offset %lld . " |
f19159dc | 2060 | "Cleaning remaining pages from readahead list", |
b6b38f70 | 2061 | bytes_read, offset); |
fb8c4b14 | 2062 | /* BB turn off caching and do new lookup on |
1da177e4 | 2063 | file size at server? */ |
1da177e4 LT |
2064 | break; |
2065 | } | |
2066 | if (smb_read_data) { | |
fb8c4b14 | 2067 | if (buf_type == CIFS_SMALL_BUFFER) |
ec637e3f | 2068 | cifs_small_buf_release(smb_read_data); |
fb8c4b14 | 2069 | else if (buf_type == CIFS_LARGE_BUFFER) |
ec637e3f | 2070 | cifs_buf_release(smb_read_data); |
1da177e4 LT |
2071 | smb_read_data = NULL; |
2072 | } | |
2073 | bytes_read = 0; | |
2074 | } | |
2075 | ||
1da177e4 LT |
2076 | /* need to free smb_read_data buf before exit */ |
2077 | if (smb_read_data) { | |
fb8c4b14 | 2078 | if (buf_type == CIFS_SMALL_BUFFER) |
47c886b3 | 2079 | cifs_small_buf_release(smb_read_data); |
fb8c4b14 | 2080 | else if (buf_type == CIFS_LARGE_BUFFER) |
47c886b3 | 2081 | cifs_buf_release(smb_read_data); |
1da177e4 | 2082 | smb_read_data = NULL; |
fb8c4b14 | 2083 | } |
1da177e4 LT |
2084 | |
2085 | FreeXid(xid); | |
2086 | return rc; | |
2087 | } | |
2088 | ||
2089 | static int cifs_readpage_worker(struct file *file, struct page *page, | |
2090 | loff_t *poffset) | |
2091 | { | |
2092 | char *read_data; | |
2093 | int rc; | |
2094 | ||
2095 | page_cache_get(page); | |
2096 | read_data = kmap(page); | |
2097 | /* for reads over a certain size could initiate async read ahead */ | |
fb8c4b14 | 2098 | |
1da177e4 | 2099 | rc = cifs_read(file, read_data, PAGE_CACHE_SIZE, poffset); |
fb8c4b14 | 2100 | |
1da177e4 LT |
2101 | if (rc < 0) |
2102 | goto io_error; | |
2103 | else | |
b6b38f70 | 2104 | cFYI(1, "Bytes read %d", rc); |
fb8c4b14 | 2105 | |
e6a00296 JJS |
2106 | file->f_path.dentry->d_inode->i_atime = |
2107 | current_fs_time(file->f_path.dentry->d_inode->i_sb); | |
fb8c4b14 | 2108 | |
1da177e4 LT |
2109 | if (PAGE_CACHE_SIZE > rc) |
2110 | memset(read_data + rc, 0, PAGE_CACHE_SIZE - rc); | |
2111 | ||
2112 | flush_dcache_page(page); | |
2113 | SetPageUptodate(page); | |
2114 | rc = 0; | |
fb8c4b14 | 2115 | |
1da177e4 | 2116 | io_error: |
fb8c4b14 | 2117 | kunmap(page); |
1da177e4 LT |
2118 | page_cache_release(page); |
2119 | return rc; | |
2120 | } | |
2121 | ||
2122 | static int cifs_readpage(struct file *file, struct page *page) | |
2123 | { | |
2124 | loff_t offset = (loff_t)page->index << PAGE_CACHE_SHIFT; | |
2125 | int rc = -EACCES; | |
2126 | int xid; | |
2127 | ||
2128 | xid = GetXid(); | |
2129 | ||
2130 | if (file->private_data == NULL) { | |
0f3bc09e | 2131 | rc = -EBADF; |
1da177e4 | 2132 | FreeXid(xid); |
0f3bc09e | 2133 | return rc; |
1da177e4 LT |
2134 | } |
2135 | ||
b6b38f70 JP |
2136 | cFYI(1, "readpage %p at offset %d 0x%x\n", |
2137 | page, (int)offset, (int)offset); | |
1da177e4 LT |
2138 | |
2139 | rc = cifs_readpage_worker(file, page, &offset); | |
2140 | ||
2141 | unlock_page(page); | |
2142 | ||
2143 | FreeXid(xid); | |
2144 | return rc; | |
2145 | } | |
2146 | ||
a403a0a3 SF |
2147 | static int is_inode_writable(struct cifsInodeInfo *cifs_inode) |
2148 | { | |
2149 | struct cifsFileInfo *open_file; | |
2150 | ||
2151 | read_lock(&GlobalSMBSeslock); | |
2152 | list_for_each_entry(open_file, &cifs_inode->openFileList, flist) { | |
2153 | if (open_file->closePend) | |
2154 | continue; | |
2155 | if (open_file->pfile && | |
2156 | ((open_file->pfile->f_flags & O_RDWR) || | |
2157 | (open_file->pfile->f_flags & O_WRONLY))) { | |
2158 | read_unlock(&GlobalSMBSeslock); | |
2159 | return 1; | |
2160 | } | |
2161 | } | |
2162 | read_unlock(&GlobalSMBSeslock); | |
2163 | return 0; | |
2164 | } | |
2165 | ||
1da177e4 LT |
2166 | /* We do not want to update the file size from server for inodes |
2167 | open for write - to avoid races with writepage extending | |
2168 | the file - in the future we could consider allowing | |
fb8c4b14 | 2169 | refreshing the inode only on increases in the file size |
1da177e4 LT |
2170 | but this is tricky to do without racing with writebehind |
2171 | page caching in the current Linux kernel design */ | |
4b18f2a9 | 2172 | bool is_size_safe_to_change(struct cifsInodeInfo *cifsInode, __u64 end_of_file) |
1da177e4 | 2173 | { |
a403a0a3 | 2174 | if (!cifsInode) |
4b18f2a9 | 2175 | return true; |
50c2f753 | 2176 | |
a403a0a3 SF |
2177 | if (is_inode_writable(cifsInode)) { |
2178 | /* This inode is open for write at least once */ | |
c32a0b68 SF |
2179 | struct cifs_sb_info *cifs_sb; |
2180 | ||
c32a0b68 | 2181 | cifs_sb = CIFS_SB(cifsInode->vfs_inode.i_sb); |
ad7a2926 | 2182 | if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DIRECT_IO) { |
fb8c4b14 | 2183 | /* since no page cache to corrupt on directio |
c32a0b68 | 2184 | we can change size safely */ |
4b18f2a9 | 2185 | return true; |
c32a0b68 SF |
2186 | } |
2187 | ||
fb8c4b14 | 2188 | if (i_size_read(&cifsInode->vfs_inode) < end_of_file) |
4b18f2a9 | 2189 | return true; |
7ba52631 | 2190 | |
4b18f2a9 | 2191 | return false; |
23e7dd7d | 2192 | } else |
4b18f2a9 | 2193 | return true; |
1da177e4 LT |
2194 | } |
2195 | ||
d9414774 NP |
2196 | static int cifs_write_begin(struct file *file, struct address_space *mapping, |
2197 | loff_t pos, unsigned len, unsigned flags, | |
2198 | struct page **pagep, void **fsdata) | |
1da177e4 | 2199 | { |
d9414774 NP |
2200 | pgoff_t index = pos >> PAGE_CACHE_SHIFT; |
2201 | loff_t offset = pos & (PAGE_CACHE_SIZE - 1); | |
a98ee8c1 JL |
2202 | loff_t page_start = pos & PAGE_MASK; |
2203 | loff_t i_size; | |
2204 | struct page *page; | |
2205 | int rc = 0; | |
d9414774 | 2206 | |
b6b38f70 | 2207 | cFYI(1, "write_begin from %lld len %d", (long long)pos, len); |
d9414774 | 2208 | |
54566b2c | 2209 | page = grab_cache_page_write_begin(mapping, index, flags); |
a98ee8c1 JL |
2210 | if (!page) { |
2211 | rc = -ENOMEM; | |
2212 | goto out; | |
2213 | } | |
8a236264 | 2214 | |
a98ee8c1 JL |
2215 | if (PageUptodate(page)) |
2216 | goto out; | |
8a236264 | 2217 | |
a98ee8c1 JL |
2218 | /* |
2219 | * If we write a full page it will be up to date, no need to read from | |
2220 | * the server. If the write is short, we'll end up doing a sync write | |
2221 | * instead. | |
2222 | */ | |
2223 | if (len == PAGE_CACHE_SIZE) | |
2224 | goto out; | |
8a236264 | 2225 | |
a98ee8c1 JL |
2226 | /* |
2227 | * optimize away the read when we have an oplock, and we're not | |
2228 | * expecting to use any of the data we'd be reading in. That | |
2229 | * is, when the page lies beyond the EOF, or straddles the EOF | |
2230 | * and the write will cover all of the existing data. | |
2231 | */ | |
2232 | if (CIFS_I(mapping->host)->clientCanCacheRead) { | |
2233 | i_size = i_size_read(mapping->host); | |
2234 | if (page_start >= i_size || | |
2235 | (offset == 0 && (pos + len) >= i_size)) { | |
2236 | zero_user_segments(page, 0, offset, | |
2237 | offset + len, | |
2238 | PAGE_CACHE_SIZE); | |
2239 | /* | |
2240 | * PageChecked means that the parts of the page | |
2241 | * to which we're not writing are considered up | |
2242 | * to date. Once the data is copied to the | |
2243 | * page, it can be set uptodate. | |
2244 | */ | |
2245 | SetPageChecked(page); | |
2246 | goto out; | |
2247 | } | |
2248 | } | |
d9414774 | 2249 | |
a98ee8c1 JL |
2250 | if ((file->f_flags & O_ACCMODE) != O_WRONLY) { |
2251 | /* | |
2252 | * might as well read a page, it is fast enough. If we get | |
2253 | * an error, we don't need to return it. cifs_write_end will | |
2254 | * do a sync write instead since PG_uptodate isn't set. | |
2255 | */ | |
2256 | cifs_readpage_worker(file, page, &page_start); | |
8a236264 SF |
2257 | } else { |
2258 | /* we could try using another file handle if there is one - | |
2259 | but how would we lock it to prevent close of that handle | |
2260 | racing with this read? In any case | |
d9414774 | 2261 | this will be written out by write_end so is fine */ |
1da177e4 | 2262 | } |
a98ee8c1 JL |
2263 | out: |
2264 | *pagep = page; | |
2265 | return rc; | |
1da177e4 LT |
2266 | } |
2267 | ||
3bc303c2 JL |
2268 | static void |
2269 | cifs_oplock_break(struct slow_work *work) | |
2270 | { | |
2271 | struct cifsFileInfo *cfile = container_of(work, struct cifsFileInfo, | |
2272 | oplock_break); | |
2273 | struct inode *inode = cfile->pInode; | |
2274 | struct cifsInodeInfo *cinode = CIFS_I(inode); | |
2275 | struct cifs_sb_info *cifs_sb = CIFS_SB(cfile->mnt->mnt_sb); | |
2276 | int rc, waitrc = 0; | |
2277 | ||
2278 | if (inode && S_ISREG(inode->i_mode)) { | |
d54ff732 | 2279 | if (cinode->clientCanCacheRead) |
8737c930 | 2280 | break_lease(inode, O_RDONLY); |
d54ff732 | 2281 | else |
8737c930 | 2282 | break_lease(inode, O_WRONLY); |
3bc303c2 JL |
2283 | rc = filemap_fdatawrite(inode->i_mapping); |
2284 | if (cinode->clientCanCacheRead == 0) { | |
2285 | waitrc = filemap_fdatawait(inode->i_mapping); | |
2286 | invalidate_remote_inode(inode); | |
2287 | } | |
2288 | if (!rc) | |
2289 | rc = waitrc; | |
2290 | if (rc) | |
2291 | cinode->write_behind_rc = rc; | |
b6b38f70 | 2292 | cFYI(1, "Oplock flush inode %p rc %d", inode, rc); |
3bc303c2 JL |
2293 | } |
2294 | ||
2295 | /* | |
2296 | * releasing stale oplock after recent reconnect of smb session using | |
2297 | * a now incorrect file handle is not a data integrity issue but do | |
2298 | * not bother sending an oplock release if session to server still is | |
2299 | * disconnected since oplock already released by the server | |
2300 | */ | |
2301 | if (!cfile->closePend && !cfile->oplock_break_cancelled) { | |
2302 | rc = CIFSSMBLock(0, cifs_sb->tcon, cfile->netfid, 0, 0, 0, 0, | |
2303 | LOCKING_ANDX_OPLOCK_RELEASE, false); | |
b6b38f70 | 2304 | cFYI(1, "Oplock release rc = %d", rc); |
3bc303c2 JL |
2305 | } |
2306 | } | |
2307 | ||
2308 | static int | |
2309 | cifs_oplock_break_get(struct slow_work *work) | |
2310 | { | |
2311 | struct cifsFileInfo *cfile = container_of(work, struct cifsFileInfo, | |
2312 | oplock_break); | |
2313 | mntget(cfile->mnt); | |
2314 | cifsFileInfo_get(cfile); | |
2315 | return 0; | |
2316 | } | |
2317 | ||
2318 | static void | |
2319 | cifs_oplock_break_put(struct slow_work *work) | |
2320 | { | |
2321 | struct cifsFileInfo *cfile = container_of(work, struct cifsFileInfo, | |
2322 | oplock_break); | |
2323 | mntput(cfile->mnt); | |
2324 | cifsFileInfo_put(cfile); | |
2325 | } | |
2326 | ||
2327 | const struct slow_work_ops cifs_oplock_break_ops = { | |
2328 | .get_ref = cifs_oplock_break_get, | |
2329 | .put_ref = cifs_oplock_break_put, | |
2330 | .execute = cifs_oplock_break, | |
2331 | }; | |
2332 | ||
f5e54d6e | 2333 | const struct address_space_operations cifs_addr_ops = { |
1da177e4 LT |
2334 | .readpage = cifs_readpage, |
2335 | .readpages = cifs_readpages, | |
2336 | .writepage = cifs_writepage, | |
37c0eb46 | 2337 | .writepages = cifs_writepages, |
d9414774 NP |
2338 | .write_begin = cifs_write_begin, |
2339 | .write_end = cifs_write_end, | |
1da177e4 LT |
2340 | .set_page_dirty = __set_page_dirty_nobuffers, |
2341 | /* .sync_page = cifs_sync_page, */ | |
2342 | /* .direct_IO = */ | |
2343 | }; | |
273d81d6 DK |
2344 | |
2345 | /* | |
2346 | * cifs_readpages requires the server to support a buffer large enough to | |
2347 | * contain the header plus one complete page of data. Otherwise, we need | |
2348 | * to leave cifs_readpages out of the address space operations. | |
2349 | */ | |
f5e54d6e | 2350 | const struct address_space_operations cifs_addr_ops_smallbuf = { |
273d81d6 DK |
2351 | .readpage = cifs_readpage, |
2352 | .writepage = cifs_writepage, | |
2353 | .writepages = cifs_writepages, | |
d9414774 NP |
2354 | .write_begin = cifs_write_begin, |
2355 | .write_end = cifs_write_end, | |
273d81d6 DK |
2356 | .set_page_dirty = __set_page_dirty_nobuffers, |
2357 | /* .sync_page = cifs_sync_page, */ | |
2358 | /* .direct_IO = */ | |
2359 | }; |