Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* |
2 | * fs/cifs/file.c | |
3 | * | |
4 | * vfs operations that deal with files | |
fb8c4b14 | 5 | * |
f19159dc | 6 | * Copyright (C) International Business Machines Corp., 2002,2010 |
1da177e4 | 7 | * Author(s): Steve French (sfrench@us.ibm.com) |
7ee1af76 | 8 | * Jeremy Allison (jra@samba.org) |
1da177e4 LT |
9 | * |
10 | * This library is free software; you can redistribute it and/or modify | |
11 | * it under the terms of the GNU Lesser General Public License as published | |
12 | * by the Free Software Foundation; either version 2.1 of the License, or | |
13 | * (at your option) any later version. | |
14 | * | |
15 | * This library is distributed in the hope that it will be useful, | |
16 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
17 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See | |
18 | * the GNU Lesser General Public License for more details. | |
19 | * | |
20 | * You should have received a copy of the GNU Lesser General Public License | |
21 | * along with this library; if not, write to the Free Software | |
22 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA | |
23 | */ | |
24 | #include <linux/fs.h> | |
37c0eb46 | 25 | #include <linux/backing-dev.h> |
1da177e4 LT |
26 | #include <linux/stat.h> |
27 | #include <linux/fcntl.h> | |
28 | #include <linux/pagemap.h> | |
29 | #include <linux/pagevec.h> | |
37c0eb46 | 30 | #include <linux/writeback.h> |
6f88cc2e | 31 | #include <linux/task_io_accounting_ops.h> |
23e7dd7d | 32 | #include <linux/delay.h> |
3bc303c2 | 33 | #include <linux/mount.h> |
5a0e3ad6 | 34 | #include <linux/slab.h> |
1da177e4 LT |
35 | #include <asm/div64.h> |
36 | #include "cifsfs.h" | |
37 | #include "cifspdu.h" | |
38 | #include "cifsglob.h" | |
39 | #include "cifsproto.h" | |
40 | #include "cifs_unicode.h" | |
41 | #include "cifs_debug.h" | |
42 | #include "cifs_fs_sb.h" | |
9451a9a5 | 43 | #include "fscache.h" |
1da177e4 | 44 | |
1da177e4 LT |
45 | static inline int cifs_convert_flags(unsigned int flags) |
46 | { | |
47 | if ((flags & O_ACCMODE) == O_RDONLY) | |
48 | return GENERIC_READ; | |
49 | else if ((flags & O_ACCMODE) == O_WRONLY) | |
50 | return GENERIC_WRITE; | |
51 | else if ((flags & O_ACCMODE) == O_RDWR) { | |
52 | /* GENERIC_ALL is too much permission to request | |
53 | can cause unnecessary access denied on create */ | |
54 | /* return GENERIC_ALL; */ | |
55 | return (GENERIC_READ | GENERIC_WRITE); | |
56 | } | |
57 | ||
e10f7b55 JL |
58 | return (READ_CONTROL | FILE_WRITE_ATTRIBUTES | FILE_READ_ATTRIBUTES | |
59 | FILE_WRITE_EA | FILE_APPEND_DATA | FILE_WRITE_DATA | | |
60 | FILE_READ_DATA); | |
7fc8f4e9 | 61 | } |
e10f7b55 | 62 | |
608712fe | 63 | static u32 cifs_posix_convert_flags(unsigned int flags) |
7fc8f4e9 | 64 | { |
608712fe | 65 | u32 posix_flags = 0; |
e10f7b55 | 66 | |
7fc8f4e9 | 67 | if ((flags & O_ACCMODE) == O_RDONLY) |
608712fe | 68 | posix_flags = SMB_O_RDONLY; |
7fc8f4e9 | 69 | else if ((flags & O_ACCMODE) == O_WRONLY) |
608712fe JL |
70 | posix_flags = SMB_O_WRONLY; |
71 | else if ((flags & O_ACCMODE) == O_RDWR) | |
72 | posix_flags = SMB_O_RDWR; | |
73 | ||
74 | if (flags & O_CREAT) | |
75 | posix_flags |= SMB_O_CREAT; | |
76 | if (flags & O_EXCL) | |
77 | posix_flags |= SMB_O_EXCL; | |
78 | if (flags & O_TRUNC) | |
79 | posix_flags |= SMB_O_TRUNC; | |
80 | /* be safe and imply O_SYNC for O_DSYNC */ | |
6b2f3d1f | 81 | if (flags & O_DSYNC) |
608712fe | 82 | posix_flags |= SMB_O_SYNC; |
7fc8f4e9 | 83 | if (flags & O_DIRECTORY) |
608712fe | 84 | posix_flags |= SMB_O_DIRECTORY; |
7fc8f4e9 | 85 | if (flags & O_NOFOLLOW) |
608712fe | 86 | posix_flags |= SMB_O_NOFOLLOW; |
7fc8f4e9 | 87 | if (flags & O_DIRECT) |
608712fe | 88 | posix_flags |= SMB_O_DIRECT; |
7fc8f4e9 SF |
89 | |
90 | return posix_flags; | |
1da177e4 LT |
91 | } |
92 | ||
93 | static inline int cifs_get_disposition(unsigned int flags) | |
94 | { | |
95 | if ((flags & (O_CREAT | O_EXCL)) == (O_CREAT | O_EXCL)) | |
96 | return FILE_CREATE; | |
97 | else if ((flags & (O_CREAT | O_TRUNC)) == (O_CREAT | O_TRUNC)) | |
98 | return FILE_OVERWRITE_IF; | |
99 | else if ((flags & O_CREAT) == O_CREAT) | |
100 | return FILE_OPEN_IF; | |
55aa2e09 SF |
101 | else if ((flags & O_TRUNC) == O_TRUNC) |
102 | return FILE_OVERWRITE; | |
1da177e4 LT |
103 | else |
104 | return FILE_OPEN; | |
105 | } | |
106 | ||
db460242 | 107 | static inline int cifs_open_inode_helper(struct inode *inode, |
a347ecb2 | 108 | struct cifsTconInfo *pTcon, __u32 oplock, FILE_ALL_INFO *buf, |
1da177e4 LT |
109 | char *full_path, int xid) |
110 | { | |
db460242 | 111 | struct cifsInodeInfo *pCifsInode = CIFS_I(inode); |
1da177e4 LT |
112 | struct timespec temp; |
113 | int rc; | |
114 | ||
1da177e4 LT |
115 | if (pCifsInode->clientCanCacheRead) { |
116 | /* we have the inode open somewhere else | |
117 | no need to discard cache data */ | |
118 | goto client_can_cache; | |
119 | } | |
120 | ||
121 | /* BB need same check in cifs_create too? */ | |
122 | /* if not oplocked, invalidate inode pages if mtime or file | |
123 | size changed */ | |
07119a4d | 124 | temp = cifs_NTtimeToUnix(buf->LastWriteTime); |
db460242 JL |
125 | if (timespec_equal(&inode->i_mtime, &temp) && |
126 | (inode->i_size == | |
1da177e4 | 127 | (loff_t)le64_to_cpu(buf->EndOfFile))) { |
b6b38f70 | 128 | cFYI(1, "inode unchanged on server"); |
1da177e4 | 129 | } else { |
db460242 | 130 | if (inode->i_mapping) { |
ff215713 SF |
131 | /* BB no need to lock inode until after invalidate |
132 | since namei code should already have it locked? */ | |
db460242 | 133 | rc = filemap_write_and_wait(inode->i_mapping); |
cea21805 | 134 | if (rc != 0) |
db460242 | 135 | pCifsInode->write_behind_rc = rc; |
1da177e4 | 136 | } |
b6b38f70 JP |
137 | cFYI(1, "invalidating remote inode since open detected it " |
138 | "changed"); | |
db460242 | 139 | invalidate_remote_inode(inode); |
1da177e4 LT |
140 | } |
141 | ||
142 | client_can_cache: | |
c18c842b | 143 | if (pTcon->unix_ext) |
db460242 JL |
144 | rc = cifs_get_inode_info_unix(&inode, full_path, inode->i_sb, |
145 | xid); | |
1da177e4 | 146 | else |
db460242 JL |
147 | rc = cifs_get_inode_info(&inode, full_path, buf, inode->i_sb, |
148 | xid, NULL); | |
1da177e4 | 149 | |
a347ecb2 | 150 | if ((oplock & 0xF) == OPLOCK_EXCLUSIVE) { |
4b18f2a9 SF |
151 | pCifsInode->clientCanCacheAll = true; |
152 | pCifsInode->clientCanCacheRead = true; | |
db460242 | 153 | cFYI(1, "Exclusive Oplock granted on inode %p", inode); |
a347ecb2 | 154 | } else if ((oplock & 0xF) == OPLOCK_READ) |
4b18f2a9 | 155 | pCifsInode->clientCanCacheRead = true; |
1da177e4 LT |
156 | |
157 | return rc; | |
158 | } | |
159 | ||
608712fe JL |
160 | int cifs_posix_open(char *full_path, struct inode **pinode, |
161 | struct super_block *sb, int mode, unsigned int f_flags, | |
162 | __u32 *poplock, __u16 *pnetfid, int xid) | |
163 | { | |
164 | int rc; | |
165 | FILE_UNIX_BASIC_INFO *presp_data; | |
166 | __u32 posix_flags = 0; | |
167 | struct cifs_sb_info *cifs_sb = CIFS_SB(sb); | |
168 | struct cifs_fattr fattr; | |
169 | struct tcon_link *tlink; | |
170 | struct cifsTconInfo *tcon; | |
171 | ||
172 | cFYI(1, "posix open %s", full_path); | |
173 | ||
174 | presp_data = kzalloc(sizeof(FILE_UNIX_BASIC_INFO), GFP_KERNEL); | |
175 | if (presp_data == NULL) | |
176 | return -ENOMEM; | |
177 | ||
178 | tlink = cifs_sb_tlink(cifs_sb); | |
179 | if (IS_ERR(tlink)) { | |
180 | rc = PTR_ERR(tlink); | |
181 | goto posix_open_ret; | |
182 | } | |
183 | ||
184 | tcon = tlink_tcon(tlink); | |
185 | mode &= ~current_umask(); | |
186 | ||
187 | posix_flags = cifs_posix_convert_flags(f_flags); | |
188 | rc = CIFSPOSIXCreate(xid, tcon, posix_flags, mode, pnetfid, presp_data, | |
189 | poplock, full_path, cifs_sb->local_nls, | |
190 | cifs_sb->mnt_cifs_flags & | |
191 | CIFS_MOUNT_MAP_SPECIAL_CHR); | |
192 | cifs_put_tlink(tlink); | |
193 | ||
194 | if (rc) | |
195 | goto posix_open_ret; | |
196 | ||
197 | if (presp_data->Type == cpu_to_le32(-1)) | |
198 | goto posix_open_ret; /* open ok, caller does qpathinfo */ | |
199 | ||
200 | if (!pinode) | |
201 | goto posix_open_ret; /* caller does not need info */ | |
202 | ||
203 | cifs_unix_basic_to_fattr(&fattr, presp_data, cifs_sb); | |
204 | ||
205 | /* get new inode and set it up */ | |
206 | if (*pinode == NULL) { | |
207 | cifs_fill_uniqueid(sb, &fattr); | |
208 | *pinode = cifs_iget(sb, &fattr); | |
209 | if (!*pinode) { | |
210 | rc = -ENOMEM; | |
211 | goto posix_open_ret; | |
212 | } | |
213 | } else { | |
214 | cifs_fattr_to_inode(*pinode, &fattr); | |
215 | } | |
216 | ||
217 | posix_open_ret: | |
218 | kfree(presp_data); | |
219 | return rc; | |
220 | } | |
221 | ||
15ecb436 JL |
222 | struct cifsFileInfo * |
223 | cifs_new_fileinfo(__u16 fileHandle, struct file *file, | |
224 | struct tcon_link *tlink, __u32 oplock) | |
225 | { | |
226 | struct dentry *dentry = file->f_path.dentry; | |
227 | struct inode *inode = dentry->d_inode; | |
228 | struct cifsInodeInfo *pCifsInode = CIFS_I(inode); | |
229 | struct cifsFileInfo *pCifsFile; | |
230 | ||
231 | pCifsFile = kzalloc(sizeof(struct cifsFileInfo), GFP_KERNEL); | |
232 | if (pCifsFile == NULL) | |
233 | return pCifsFile; | |
234 | ||
235 | pCifsFile->netfid = fileHandle; | |
236 | pCifsFile->pid = current->tgid; | |
237 | pCifsFile->uid = current_fsuid(); | |
238 | pCifsFile->dentry = dget(dentry); | |
239 | pCifsFile->f_flags = file->f_flags; | |
240 | pCifsFile->invalidHandle = false; | |
241 | pCifsFile->closePend = false; | |
242 | pCifsFile->tlink = cifs_get_tlink(tlink); | |
243 | mutex_init(&pCifsFile->fh_mutex); | |
244 | mutex_init(&pCifsFile->lock_mutex); | |
245 | INIT_LIST_HEAD(&pCifsFile->llist); | |
246 | atomic_set(&pCifsFile->count, 1); | |
247 | INIT_WORK(&pCifsFile->oplock_break, cifs_oplock_break); | |
248 | ||
4477288a | 249 | spin_lock(&cifs_file_list_lock); |
15ecb436 JL |
250 | list_add(&pCifsFile->tlist, &(tlink_tcon(tlink)->openFileList)); |
251 | /* if readable file instance put first in list*/ | |
252 | if (file->f_mode & FMODE_READ) | |
253 | list_add(&pCifsFile->flist, &pCifsInode->openFileList); | |
254 | else | |
255 | list_add_tail(&pCifsFile->flist, &pCifsInode->openFileList); | |
4477288a | 256 | spin_unlock(&cifs_file_list_lock); |
15ecb436 JL |
257 | |
258 | if ((oplock & 0xF) == OPLOCK_EXCLUSIVE) { | |
259 | pCifsInode->clientCanCacheAll = true; | |
260 | pCifsInode->clientCanCacheRead = true; | |
261 | cFYI(1, "Exclusive Oplock inode %p", inode); | |
262 | } else if ((oplock & 0xF) == OPLOCK_READ) | |
263 | pCifsInode->clientCanCacheRead = true; | |
264 | ||
265 | file->private_data = pCifsFile; | |
266 | return pCifsFile; | |
267 | } | |
268 | ||
1da177e4 LT |
269 | int cifs_open(struct inode *inode, struct file *file) |
270 | { | |
271 | int rc = -EACCES; | |
590a3fe0 JL |
272 | int xid; |
273 | __u32 oplock; | |
1da177e4 | 274 | struct cifs_sb_info *cifs_sb; |
276a74a4 | 275 | struct cifsTconInfo *tcon; |
7ffec372 | 276 | struct tcon_link *tlink; |
6ca9f3ba | 277 | struct cifsFileInfo *pCifsFile = NULL; |
1da177e4 | 278 | struct cifsInodeInfo *pCifsInode; |
1da177e4 LT |
279 | char *full_path = NULL; |
280 | int desiredAccess; | |
281 | int disposition; | |
282 | __u16 netfid; | |
283 | FILE_ALL_INFO *buf = NULL; | |
284 | ||
285 | xid = GetXid(); | |
286 | ||
287 | cifs_sb = CIFS_SB(inode->i_sb); | |
7ffec372 JL |
288 | tlink = cifs_sb_tlink(cifs_sb); |
289 | if (IS_ERR(tlink)) { | |
290 | FreeXid(xid); | |
291 | return PTR_ERR(tlink); | |
292 | } | |
293 | tcon = tlink_tcon(tlink); | |
1da177e4 | 294 | |
a6ce4932 | 295 | pCifsInode = CIFS_I(file->f_path.dentry->d_inode); |
1da177e4 | 296 | |
e6a00296 | 297 | full_path = build_path_from_dentry(file->f_path.dentry); |
1da177e4 | 298 | if (full_path == NULL) { |
0f3bc09e | 299 | rc = -ENOMEM; |
232341ba | 300 | goto out; |
1da177e4 LT |
301 | } |
302 | ||
b6b38f70 JP |
303 | cFYI(1, "inode = 0x%p file flags are 0x%x for %s", |
304 | inode, file->f_flags, full_path); | |
276a74a4 SF |
305 | |
306 | if (oplockEnabled) | |
307 | oplock = REQ_OPLOCK; | |
308 | else | |
309 | oplock = 0; | |
310 | ||
64cc2c63 SF |
311 | if (!tcon->broken_posix_open && tcon->unix_ext && |
312 | (tcon->ses->capabilities & CAP_UNIX) && | |
276a74a4 SF |
313 | (CIFS_UNIX_POSIX_PATH_OPS_CAP & |
314 | le64_to_cpu(tcon->fsUnixInfo.Capability))) { | |
276a74a4 | 315 | /* can not refresh inode info since size could be stale */ |
2422f676 | 316 | rc = cifs_posix_open(full_path, &inode, inode->i_sb, |
fa588e0c | 317 | cifs_sb->mnt_file_mode /* ignored */, |
608712fe | 318 | file->f_flags, &oplock, &netfid, xid); |
276a74a4 | 319 | if (rc == 0) { |
b6b38f70 | 320 | cFYI(1, "posix open succeeded"); |
47c78b7f | 321 | |
abfe1eed JL |
322 | pCifsFile = cifs_new_fileinfo(netfid, file, tlink, |
323 | oplock); | |
2422f676 JL |
324 | if (pCifsFile == NULL) { |
325 | CIFSSMBClose(xid, tcon, netfid); | |
326 | rc = -ENOMEM; | |
2422f676 | 327 | } |
9451a9a5 SJ |
328 | |
329 | cifs_fscache_set_inode_cookie(inode, file); | |
330 | ||
276a74a4 | 331 | goto out; |
64cc2c63 SF |
332 | } else if ((rc == -EINVAL) || (rc == -EOPNOTSUPP)) { |
333 | if (tcon->ses->serverNOS) | |
b6b38f70 | 334 | cERROR(1, "server %s of type %s returned" |
64cc2c63 SF |
335 | " unexpected error on SMB posix open" |
336 | ", disabling posix open support." | |
337 | " Check if server update available.", | |
338 | tcon->ses->serverName, | |
b6b38f70 | 339 | tcon->ses->serverNOS); |
64cc2c63 | 340 | tcon->broken_posix_open = true; |
276a74a4 SF |
341 | } else if ((rc != -EIO) && (rc != -EREMOTE) && |
342 | (rc != -EOPNOTSUPP)) /* path not found or net err */ | |
343 | goto out; | |
64cc2c63 SF |
344 | /* else fallthrough to retry open the old way on network i/o |
345 | or DFS errors */ | |
276a74a4 SF |
346 | } |
347 | ||
1da177e4 LT |
348 | desiredAccess = cifs_convert_flags(file->f_flags); |
349 | ||
350 | /********************************************************************* | |
351 | * open flag mapping table: | |
fb8c4b14 | 352 | * |
1da177e4 | 353 | * POSIX Flag CIFS Disposition |
fb8c4b14 | 354 | * ---------- ---------------- |
1da177e4 LT |
355 | * O_CREAT FILE_OPEN_IF |
356 | * O_CREAT | O_EXCL FILE_CREATE | |
357 | * O_CREAT | O_TRUNC FILE_OVERWRITE_IF | |
358 | * O_TRUNC FILE_OVERWRITE | |
359 | * none of the above FILE_OPEN | |
360 | * | |
361 | * Note that there is not a direct match between disposition | |
fb8c4b14 | 362 | * FILE_SUPERSEDE (ie create whether or not file exists although |
1da177e4 LT |
363 | * O_CREAT | O_TRUNC is similar but truncates the existing |
364 | * file rather than creating a new file as FILE_SUPERSEDE does | |
365 | * (which uses the attributes / metadata passed in on open call) | |
366 | *? | |
fb8c4b14 | 367 | *? O_SYNC is a reasonable match to CIFS writethrough flag |
1da177e4 LT |
368 | *? and the read write flags match reasonably. O_LARGEFILE |
369 | *? is irrelevant because largefile support is always used | |
370 | *? by this client. Flags O_APPEND, O_DIRECT, O_DIRECTORY, | |
371 | * O_FASYNC, O_NOFOLLOW, O_NONBLOCK need further investigation | |
372 | *********************************************************************/ | |
373 | ||
374 | disposition = cifs_get_disposition(file->f_flags); | |
375 | ||
1da177e4 LT |
376 | /* BB pass O_SYNC flag through on file attributes .. BB */ |
377 | ||
378 | /* Also refresh inode by passing in file_info buf returned by SMBOpen | |
379 | and calling get_inode_info with returned buf (at least helps | |
380 | non-Unix server case) */ | |
381 | ||
fb8c4b14 SF |
382 | /* BB we can not do this if this is the second open of a file |
383 | and the first handle has writebehind data, we might be | |
1da177e4 LT |
384 | able to simply do a filemap_fdatawrite/filemap_fdatawait first */ |
385 | buf = kmalloc(sizeof(FILE_ALL_INFO), GFP_KERNEL); | |
386 | if (!buf) { | |
387 | rc = -ENOMEM; | |
388 | goto out; | |
389 | } | |
5bafd765 | 390 | |
a6e8a845 | 391 | if (tcon->ses->capabilities & CAP_NT_SMBS) |
276a74a4 | 392 | rc = CIFSSMBOpen(xid, tcon, full_path, disposition, |
5bafd765 | 393 | desiredAccess, CREATE_NOT_DIR, &netfid, &oplock, buf, |
737b758c SF |
394 | cifs_sb->local_nls, cifs_sb->mnt_cifs_flags |
395 | & CIFS_MOUNT_MAP_SPECIAL_CHR); | |
5bafd765 SF |
396 | else |
397 | rc = -EIO; /* no NT SMB support fall into legacy open below */ | |
398 | ||
a9d02ad4 SF |
399 | if (rc == -EIO) { |
400 | /* Old server, try legacy style OpenX */ | |
276a74a4 | 401 | rc = SMBLegacyOpen(xid, tcon, full_path, disposition, |
a9d02ad4 SF |
402 | desiredAccess, CREATE_NOT_DIR, &netfid, &oplock, buf, |
403 | cifs_sb->local_nls, cifs_sb->mnt_cifs_flags | |
404 | & CIFS_MOUNT_MAP_SPECIAL_CHR); | |
405 | } | |
1da177e4 | 406 | if (rc) { |
b6b38f70 | 407 | cFYI(1, "cifs_open returned 0x%x", rc); |
1da177e4 LT |
408 | goto out; |
409 | } | |
3321b791 | 410 | |
a347ecb2 | 411 | rc = cifs_open_inode_helper(inode, tcon, oplock, buf, full_path, xid); |
47c78b7f JL |
412 | if (rc != 0) |
413 | goto out; | |
414 | ||
abfe1eed | 415 | pCifsFile = cifs_new_fileinfo(netfid, file, tlink, oplock); |
6ca9f3ba | 416 | if (pCifsFile == NULL) { |
1da177e4 LT |
417 | rc = -ENOMEM; |
418 | goto out; | |
419 | } | |
1da177e4 | 420 | |
9451a9a5 SJ |
421 | cifs_fscache_set_inode_cookie(inode, file); |
422 | ||
fb8c4b14 | 423 | if (oplock & CIFS_CREATE_ACTION) { |
1da177e4 LT |
424 | /* time to set mode which we can not set earlier due to |
425 | problems creating new read-only files */ | |
276a74a4 | 426 | if (tcon->unix_ext) { |
4e1e7fb9 JL |
427 | struct cifs_unix_set_info_args args = { |
428 | .mode = inode->i_mode, | |
429 | .uid = NO_CHANGE_64, | |
430 | .gid = NO_CHANGE_64, | |
431 | .ctime = NO_CHANGE_64, | |
432 | .atime = NO_CHANGE_64, | |
433 | .mtime = NO_CHANGE_64, | |
434 | .device = 0, | |
435 | }; | |
01ea95e3 JL |
436 | CIFSSMBUnixSetPathInfo(xid, tcon, full_path, &args, |
437 | cifs_sb->local_nls, | |
438 | cifs_sb->mnt_cifs_flags & | |
737b758c | 439 | CIFS_MOUNT_MAP_SPECIAL_CHR); |
1da177e4 LT |
440 | } |
441 | } | |
442 | ||
443 | out: | |
444 | kfree(buf); | |
445 | kfree(full_path); | |
446 | FreeXid(xid); | |
7ffec372 | 447 | cifs_put_tlink(tlink); |
1da177e4 LT |
448 | return rc; |
449 | } | |
450 | ||
0418726b | 451 | /* Try to reacquire byte range locks that were released when session */ |
1da177e4 LT |
452 | /* to server was lost */ |
453 | static int cifs_relock_file(struct cifsFileInfo *cifsFile) | |
454 | { | |
455 | int rc = 0; | |
456 | ||
457 | /* BB list all locks open on this file and relock */ | |
458 | ||
459 | return rc; | |
460 | } | |
461 | ||
15886177 | 462 | static int cifs_reopen_file(struct cifsFileInfo *pCifsFile, bool can_flush) |
1da177e4 LT |
463 | { |
464 | int rc = -EACCES; | |
590a3fe0 JL |
465 | int xid; |
466 | __u32 oplock; | |
1da177e4 | 467 | struct cifs_sb_info *cifs_sb; |
7fc8f4e9 | 468 | struct cifsTconInfo *tcon; |
1da177e4 | 469 | struct cifsInodeInfo *pCifsInode; |
fb8c4b14 | 470 | struct inode *inode; |
1da177e4 LT |
471 | char *full_path = NULL; |
472 | int desiredAccess; | |
473 | int disposition = FILE_OPEN; | |
474 | __u16 netfid; | |
475 | ||
1da177e4 | 476 | xid = GetXid(); |
f0a71eb8 | 477 | mutex_lock(&pCifsFile->fh_mutex); |
4b18f2a9 | 478 | if (!pCifsFile->invalidHandle) { |
f0a71eb8 | 479 | mutex_unlock(&pCifsFile->fh_mutex); |
0f3bc09e | 480 | rc = 0; |
1da177e4 | 481 | FreeXid(xid); |
0f3bc09e | 482 | return rc; |
1da177e4 LT |
483 | } |
484 | ||
15886177 | 485 | inode = pCifsFile->dentry->d_inode; |
1da177e4 | 486 | cifs_sb = CIFS_SB(inode->i_sb); |
13cfb733 | 487 | tcon = tlink_tcon(pCifsFile->tlink); |
3a9f462f | 488 | |
1da177e4 LT |
489 | /* can not grab rename sem here because various ops, including |
490 | those that already have the rename sem can end up causing writepage | |
491 | to get called and if the server was down that means we end up here, | |
492 | and we can never tell if the caller already has the rename_sem */ | |
15886177 | 493 | full_path = build_path_from_dentry(pCifsFile->dentry); |
1da177e4 | 494 | if (full_path == NULL) { |
3a9f462f | 495 | rc = -ENOMEM; |
f0a71eb8 | 496 | mutex_unlock(&pCifsFile->fh_mutex); |
1da177e4 | 497 | FreeXid(xid); |
3a9f462f | 498 | return rc; |
1da177e4 LT |
499 | } |
500 | ||
b6b38f70 | 501 | cFYI(1, "inode = 0x%p file flags 0x%x for %s", |
15886177 | 502 | inode, pCifsFile->f_flags, full_path); |
1da177e4 LT |
503 | |
504 | if (oplockEnabled) | |
505 | oplock = REQ_OPLOCK; | |
506 | else | |
4b18f2a9 | 507 | oplock = 0; |
1da177e4 | 508 | |
7fc8f4e9 SF |
509 | if (tcon->unix_ext && (tcon->ses->capabilities & CAP_UNIX) && |
510 | (CIFS_UNIX_POSIX_PATH_OPS_CAP & | |
511 | le64_to_cpu(tcon->fsUnixInfo.Capability))) { | |
608712fe JL |
512 | |
513 | /* | |
514 | * O_CREAT, O_EXCL and O_TRUNC already had their effect on the | |
515 | * original open. Must mask them off for a reopen. | |
516 | */ | |
15886177 JL |
517 | unsigned int oflags = pCifsFile->f_flags & |
518 | ~(O_CREAT | O_EXCL | O_TRUNC); | |
608712fe | 519 | |
2422f676 | 520 | rc = cifs_posix_open(full_path, NULL, inode->i_sb, |
fa588e0c SF |
521 | cifs_sb->mnt_file_mode /* ignored */, |
522 | oflags, &oplock, &netfid, xid); | |
7fc8f4e9 | 523 | if (rc == 0) { |
b6b38f70 | 524 | cFYI(1, "posix reopen succeeded"); |
7fc8f4e9 SF |
525 | goto reopen_success; |
526 | } | |
527 | /* fallthrough to retry open the old way on errors, especially | |
528 | in the reconnect path it is important to retry hard */ | |
529 | } | |
530 | ||
15886177 | 531 | desiredAccess = cifs_convert_flags(pCifsFile->f_flags); |
7fc8f4e9 | 532 | |
1da177e4 | 533 | /* Can not refresh inode by passing in file_info buf to be returned |
fb8c4b14 SF |
534 | by SMBOpen and then calling get_inode_info with returned buf |
535 | since file might have write behind data that needs to be flushed | |
1da177e4 LT |
536 | and server version of file size can be stale. If we knew for sure |
537 | that inode was not dirty locally we could do this */ | |
538 | ||
7fc8f4e9 | 539 | rc = CIFSSMBOpen(xid, tcon, full_path, disposition, desiredAccess, |
1da177e4 | 540 | CREATE_NOT_DIR, &netfid, &oplock, NULL, |
fb8c4b14 | 541 | cifs_sb->local_nls, cifs_sb->mnt_cifs_flags & |
737b758c | 542 | CIFS_MOUNT_MAP_SPECIAL_CHR); |
1da177e4 | 543 | if (rc) { |
f0a71eb8 | 544 | mutex_unlock(&pCifsFile->fh_mutex); |
b6b38f70 JP |
545 | cFYI(1, "cifs_open returned 0x%x", rc); |
546 | cFYI(1, "oplock: %d", oplock); | |
15886177 JL |
547 | goto reopen_error_exit; |
548 | } | |
549 | ||
7fc8f4e9 | 550 | reopen_success: |
15886177 JL |
551 | pCifsFile->netfid = netfid; |
552 | pCifsFile->invalidHandle = false; | |
553 | mutex_unlock(&pCifsFile->fh_mutex); | |
554 | pCifsInode = CIFS_I(inode); | |
555 | ||
556 | if (can_flush) { | |
557 | rc = filemap_write_and_wait(inode->i_mapping); | |
558 | if (rc != 0) | |
559 | CIFS_I(inode)->write_behind_rc = rc; | |
560 | ||
561 | pCifsInode->clientCanCacheAll = false; | |
562 | pCifsInode->clientCanCacheRead = false; | |
563 | if (tcon->unix_ext) | |
564 | rc = cifs_get_inode_info_unix(&inode, | |
565 | full_path, inode->i_sb, xid); | |
566 | else | |
567 | rc = cifs_get_inode_info(&inode, | |
568 | full_path, NULL, inode->i_sb, | |
569 | xid, NULL); | |
570 | } /* else we are writing out data to server already | |
571 | and could deadlock if we tried to flush data, and | |
572 | since we do not know if we have data that would | |
573 | invalidate the current end of file on the server | |
574 | we can not go to the server to get the new inod | |
575 | info */ | |
576 | if ((oplock & 0xF) == OPLOCK_EXCLUSIVE) { | |
577 | pCifsInode->clientCanCacheAll = true; | |
578 | pCifsInode->clientCanCacheRead = true; | |
579 | cFYI(1, "Exclusive Oplock granted on inode %p", | |
580 | pCifsFile->dentry->d_inode); | |
581 | } else if ((oplock & 0xF) == OPLOCK_READ) { | |
582 | pCifsInode->clientCanCacheRead = true; | |
583 | pCifsInode->clientCanCacheAll = false; | |
584 | } else { | |
585 | pCifsInode->clientCanCacheRead = false; | |
586 | pCifsInode->clientCanCacheAll = false; | |
1da177e4 | 587 | } |
15886177 JL |
588 | cifs_relock_file(pCifsFile); |
589 | ||
590 | reopen_error_exit: | |
1da177e4 LT |
591 | kfree(full_path); |
592 | FreeXid(xid); | |
593 | return rc; | |
594 | } | |
595 | ||
596 | int cifs_close(struct inode *inode, struct file *file) | |
597 | { | |
598 | int rc = 0; | |
15745320 | 599 | int xid, timeout; |
1da177e4 LT |
600 | struct cifs_sb_info *cifs_sb; |
601 | struct cifsTconInfo *pTcon; | |
c21dfb69 | 602 | struct cifsFileInfo *pSMBFile = file->private_data; |
1da177e4 LT |
603 | |
604 | xid = GetXid(); | |
605 | ||
606 | cifs_sb = CIFS_SB(inode->i_sb); | |
13cfb733 | 607 | pTcon = tlink_tcon(pSMBFile->tlink); |
1da177e4 | 608 | if (pSMBFile) { |
7ee1af76 | 609 | struct cifsLockInfo *li, *tmp; |
4477288a | 610 | spin_lock(&cifs_file_list_lock); |
4b18f2a9 | 611 | pSMBFile->closePend = true; |
1da177e4 LT |
612 | if (pTcon) { |
613 | /* no sense reconnecting to close a file that is | |
614 | already closed */ | |
3b795210 | 615 | if (!pTcon->need_reconnect) { |
4477288a | 616 | spin_unlock(&cifs_file_list_lock); |
15745320 | 617 | timeout = 2; |
6ab409b5 | 618 | while ((atomic_read(&pSMBFile->count) != 1) |
15745320 | 619 | && (timeout <= 2048)) { |
23e7dd7d SF |
620 | /* Give write a better chance to get to |
621 | server ahead of the close. We do not | |
622 | want to add a wait_q here as it would | |
623 | increase the memory utilization as | |
624 | the struct would be in each open file, | |
fb8c4b14 | 625 | but this should give enough time to |
23e7dd7d | 626 | clear the socket */ |
b6b38f70 | 627 | cFYI(DBG2, "close delay, write pending"); |
23e7dd7d SF |
628 | msleep(timeout); |
629 | timeout *= 4; | |
4891d539 | 630 | } |
ddb4cbfc SF |
631 | if (!pTcon->need_reconnect && |
632 | !pSMBFile->invalidHandle) | |
633 | rc = CIFSSMBClose(xid, pTcon, | |
1da177e4 | 634 | pSMBFile->netfid); |
ddb4cbfc | 635 | } else |
4477288a | 636 | spin_unlock(&cifs_file_list_lock); |
ddb4cbfc | 637 | } else |
4477288a | 638 | spin_unlock(&cifs_file_list_lock); |
7ee1af76 JA |
639 | |
640 | /* Delete any outstanding lock records. | |
641 | We'll lose them when the file is closed anyway. */ | |
796e5661 | 642 | mutex_lock(&pSMBFile->lock_mutex); |
7ee1af76 JA |
643 | list_for_each_entry_safe(li, tmp, &pSMBFile->llist, llist) { |
644 | list_del(&li->llist); | |
645 | kfree(li); | |
646 | } | |
796e5661 | 647 | mutex_unlock(&pSMBFile->lock_mutex); |
7ee1af76 | 648 | |
4477288a | 649 | spin_lock(&cifs_file_list_lock); |
1da177e4 LT |
650 | list_del(&pSMBFile->flist); |
651 | list_del(&pSMBFile->tlist); | |
4477288a | 652 | spin_unlock(&cifs_file_list_lock); |
6ab409b5 | 653 | cifsFileInfo_put(file->private_data); |
1da177e4 LT |
654 | file->private_data = NULL; |
655 | } else | |
656 | rc = -EBADF; | |
657 | ||
4477288a | 658 | spin_lock(&cifs_file_list_lock); |
1da177e4 | 659 | if (list_empty(&(CIFS_I(inode)->openFileList))) { |
b6b38f70 | 660 | cFYI(1, "closing last open instance for inode %p", inode); |
1da177e4 LT |
661 | /* if the file is not open we do not know if we can cache info |
662 | on this inode, much less write behind and read ahead */ | |
4b18f2a9 SF |
663 | CIFS_I(inode)->clientCanCacheRead = false; |
664 | CIFS_I(inode)->clientCanCacheAll = false; | |
1da177e4 | 665 | } |
4477288a | 666 | spin_unlock(&cifs_file_list_lock); |
fb8c4b14 | 667 | if ((rc == 0) && CIFS_I(inode)->write_behind_rc) |
1da177e4 LT |
668 | rc = CIFS_I(inode)->write_behind_rc; |
669 | FreeXid(xid); | |
670 | return rc; | |
671 | } | |
672 | ||
673 | int cifs_closedir(struct inode *inode, struct file *file) | |
674 | { | |
675 | int rc = 0; | |
676 | int xid; | |
c21dfb69 | 677 | struct cifsFileInfo *pCFileStruct = file->private_data; |
1da177e4 LT |
678 | char *ptmp; |
679 | ||
b6b38f70 | 680 | cFYI(1, "Closedir inode = 0x%p", inode); |
1da177e4 LT |
681 | |
682 | xid = GetXid(); | |
683 | ||
684 | if (pCFileStruct) { | |
13cfb733 | 685 | struct cifsTconInfo *pTcon = tlink_tcon(pCFileStruct->tlink); |
1da177e4 | 686 | |
b6b38f70 | 687 | cFYI(1, "Freeing private data in close dir"); |
4477288a | 688 | spin_lock(&cifs_file_list_lock); |
4b18f2a9 SF |
689 | if (!pCFileStruct->srch_inf.endOfSearch && |
690 | !pCFileStruct->invalidHandle) { | |
691 | pCFileStruct->invalidHandle = true; | |
4477288a | 692 | spin_unlock(&cifs_file_list_lock); |
1da177e4 | 693 | rc = CIFSFindClose(xid, pTcon, pCFileStruct->netfid); |
b6b38f70 JP |
694 | cFYI(1, "Closing uncompleted readdir with rc %d", |
695 | rc); | |
1da177e4 LT |
696 | /* not much we can do if it fails anyway, ignore rc */ |
697 | rc = 0; | |
ddb4cbfc | 698 | } else |
4477288a | 699 | spin_unlock(&cifs_file_list_lock); |
1da177e4 LT |
700 | ptmp = pCFileStruct->srch_inf.ntwrk_buf_start; |
701 | if (ptmp) { | |
b6b38f70 | 702 | cFYI(1, "closedir free smb buf in srch struct"); |
1da177e4 | 703 | pCFileStruct->srch_inf.ntwrk_buf_start = NULL; |
fb8c4b14 | 704 | if (pCFileStruct->srch_inf.smallBuf) |
d47d7c1a SF |
705 | cifs_small_buf_release(ptmp); |
706 | else | |
707 | cifs_buf_release(ptmp); | |
1da177e4 | 708 | } |
13cfb733 | 709 | cifs_put_tlink(pCFileStruct->tlink); |
1da177e4 LT |
710 | kfree(file->private_data); |
711 | file->private_data = NULL; | |
712 | } | |
713 | /* BB can we lock the filestruct while this is going on? */ | |
714 | FreeXid(xid); | |
715 | return rc; | |
716 | } | |
717 | ||
7ee1af76 JA |
718 | static int store_file_lock(struct cifsFileInfo *fid, __u64 len, |
719 | __u64 offset, __u8 lockType) | |
720 | { | |
fb8c4b14 SF |
721 | struct cifsLockInfo *li = |
722 | kmalloc(sizeof(struct cifsLockInfo), GFP_KERNEL); | |
7ee1af76 JA |
723 | if (li == NULL) |
724 | return -ENOMEM; | |
725 | li->offset = offset; | |
726 | li->length = len; | |
727 | li->type = lockType; | |
796e5661 | 728 | mutex_lock(&fid->lock_mutex); |
7ee1af76 | 729 | list_add(&li->llist, &fid->llist); |
796e5661 | 730 | mutex_unlock(&fid->lock_mutex); |
7ee1af76 JA |
731 | return 0; |
732 | } | |
733 | ||
1da177e4 LT |
734 | int cifs_lock(struct file *file, int cmd, struct file_lock *pfLock) |
735 | { | |
736 | int rc, xid; | |
1da177e4 LT |
737 | __u32 numLock = 0; |
738 | __u32 numUnlock = 0; | |
739 | __u64 length; | |
4b18f2a9 | 740 | bool wait_flag = false; |
1da177e4 | 741 | struct cifs_sb_info *cifs_sb; |
13a6e42a | 742 | struct cifsTconInfo *tcon; |
08547b03 SF |
743 | __u16 netfid; |
744 | __u8 lockType = LOCKING_ANDX_LARGE_FILES; | |
13a6e42a | 745 | bool posix_locking = 0; |
1da177e4 LT |
746 | |
747 | length = 1 + pfLock->fl_end - pfLock->fl_start; | |
748 | rc = -EACCES; | |
749 | xid = GetXid(); | |
750 | ||
b6b38f70 | 751 | cFYI(1, "Lock parm: 0x%x flockflags: " |
1da177e4 | 752 | "0x%x flocktype: 0x%x start: %lld end: %lld", |
fb8c4b14 | 753 | cmd, pfLock->fl_flags, pfLock->fl_type, pfLock->fl_start, |
b6b38f70 | 754 | pfLock->fl_end); |
1da177e4 LT |
755 | |
756 | if (pfLock->fl_flags & FL_POSIX) | |
b6b38f70 | 757 | cFYI(1, "Posix"); |
1da177e4 | 758 | if (pfLock->fl_flags & FL_FLOCK) |
b6b38f70 | 759 | cFYI(1, "Flock"); |
1da177e4 | 760 | if (pfLock->fl_flags & FL_SLEEP) { |
b6b38f70 | 761 | cFYI(1, "Blocking lock"); |
4b18f2a9 | 762 | wait_flag = true; |
1da177e4 LT |
763 | } |
764 | if (pfLock->fl_flags & FL_ACCESS) | |
b6b38f70 JP |
765 | cFYI(1, "Process suspended by mandatory locking - " |
766 | "not implemented yet"); | |
1da177e4 | 767 | if (pfLock->fl_flags & FL_LEASE) |
b6b38f70 | 768 | cFYI(1, "Lease on file - not implemented yet"); |
fb8c4b14 | 769 | if (pfLock->fl_flags & |
1da177e4 | 770 | (~(FL_POSIX | FL_FLOCK | FL_SLEEP | FL_ACCESS | FL_LEASE))) |
b6b38f70 | 771 | cFYI(1, "Unknown lock flags 0x%x", pfLock->fl_flags); |
1da177e4 LT |
772 | |
773 | if (pfLock->fl_type == F_WRLCK) { | |
b6b38f70 | 774 | cFYI(1, "F_WRLCK "); |
1da177e4 LT |
775 | numLock = 1; |
776 | } else if (pfLock->fl_type == F_UNLCK) { | |
b6b38f70 | 777 | cFYI(1, "F_UNLCK"); |
1da177e4 | 778 | numUnlock = 1; |
d47d7c1a SF |
779 | /* Check if unlock includes more than |
780 | one lock range */ | |
1da177e4 | 781 | } else if (pfLock->fl_type == F_RDLCK) { |
b6b38f70 | 782 | cFYI(1, "F_RDLCK"); |
1da177e4 LT |
783 | lockType |= LOCKING_ANDX_SHARED_LOCK; |
784 | numLock = 1; | |
785 | } else if (pfLock->fl_type == F_EXLCK) { | |
b6b38f70 | 786 | cFYI(1, "F_EXLCK"); |
1da177e4 LT |
787 | numLock = 1; |
788 | } else if (pfLock->fl_type == F_SHLCK) { | |
b6b38f70 | 789 | cFYI(1, "F_SHLCK"); |
1da177e4 LT |
790 | lockType |= LOCKING_ANDX_SHARED_LOCK; |
791 | numLock = 1; | |
792 | } else | |
b6b38f70 | 793 | cFYI(1, "Unknown type of lock"); |
1da177e4 | 794 | |
e6a00296 | 795 | cifs_sb = CIFS_SB(file->f_path.dentry->d_sb); |
13cfb733 | 796 | tcon = tlink_tcon(((struct cifsFileInfo *)file->private_data)->tlink); |
1da177e4 LT |
797 | |
798 | if (file->private_data == NULL) { | |
0f3bc09e | 799 | rc = -EBADF; |
1da177e4 | 800 | FreeXid(xid); |
0f3bc09e | 801 | return rc; |
1da177e4 | 802 | } |
08547b03 SF |
803 | netfid = ((struct cifsFileInfo *)file->private_data)->netfid; |
804 | ||
13a6e42a SF |
805 | if ((tcon->ses->capabilities & CAP_UNIX) && |
806 | (CIFS_UNIX_FCNTL_CAP & le64_to_cpu(tcon->fsUnixInfo.Capability)) && | |
acc18aa1 | 807 | ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NOPOSIXBRL) == 0)) |
13a6e42a | 808 | posix_locking = 1; |
08547b03 SF |
809 | /* BB add code here to normalize offset and length to |
810 | account for negative length which we can not accept over the | |
811 | wire */ | |
1da177e4 | 812 | if (IS_GETLK(cmd)) { |
fb8c4b14 | 813 | if (posix_locking) { |
08547b03 | 814 | int posix_lock_type; |
fb8c4b14 | 815 | if (lockType & LOCKING_ANDX_SHARED_LOCK) |
08547b03 SF |
816 | posix_lock_type = CIFS_RDLCK; |
817 | else | |
818 | posix_lock_type = CIFS_WRLCK; | |
13a6e42a | 819 | rc = CIFSSMBPosixLock(xid, tcon, netfid, 1 /* get */, |
fc94cdb9 | 820 | length, pfLock, |
08547b03 SF |
821 | posix_lock_type, wait_flag); |
822 | FreeXid(xid); | |
823 | return rc; | |
824 | } | |
825 | ||
826 | /* BB we could chain these into one lock request BB */ | |
13a6e42a | 827 | rc = CIFSSMBLock(xid, tcon, netfid, length, pfLock->fl_start, |
08547b03 | 828 | 0, 1, lockType, 0 /* wait flag */ ); |
1da177e4 | 829 | if (rc == 0) { |
13a6e42a | 830 | rc = CIFSSMBLock(xid, tcon, netfid, length, |
1da177e4 LT |
831 | pfLock->fl_start, 1 /* numUnlock */ , |
832 | 0 /* numLock */ , lockType, | |
833 | 0 /* wait flag */ ); | |
834 | pfLock->fl_type = F_UNLCK; | |
835 | if (rc != 0) | |
b6b38f70 JP |
836 | cERROR(1, "Error unlocking previously locked " |
837 | "range %d during test of lock", rc); | |
1da177e4 LT |
838 | rc = 0; |
839 | ||
840 | } else { | |
841 | /* if rc == ERR_SHARING_VIOLATION ? */ | |
f05337c6 PS |
842 | rc = 0; |
843 | ||
844 | if (lockType & LOCKING_ANDX_SHARED_LOCK) { | |
845 | pfLock->fl_type = F_WRLCK; | |
846 | } else { | |
847 | rc = CIFSSMBLock(xid, tcon, netfid, length, | |
848 | pfLock->fl_start, 0, 1, | |
849 | lockType | LOCKING_ANDX_SHARED_LOCK, | |
850 | 0 /* wait flag */); | |
851 | if (rc == 0) { | |
852 | rc = CIFSSMBLock(xid, tcon, netfid, | |
853 | length, pfLock->fl_start, 1, 0, | |
854 | lockType | | |
855 | LOCKING_ANDX_SHARED_LOCK, | |
856 | 0 /* wait flag */); | |
857 | pfLock->fl_type = F_RDLCK; | |
858 | if (rc != 0) | |
f19159dc | 859 | cERROR(1, "Error unlocking " |
f05337c6 | 860 | "previously locked range %d " |
f19159dc | 861 | "during test of lock", rc); |
f05337c6 PS |
862 | rc = 0; |
863 | } else { | |
864 | pfLock->fl_type = F_WRLCK; | |
865 | rc = 0; | |
866 | } | |
867 | } | |
1da177e4 LT |
868 | } |
869 | ||
870 | FreeXid(xid); | |
871 | return rc; | |
872 | } | |
7ee1af76 JA |
873 | |
874 | if (!numLock && !numUnlock) { | |
875 | /* if no lock or unlock then nothing | |
876 | to do since we do not know what it is */ | |
877 | FreeXid(xid); | |
878 | return -EOPNOTSUPP; | |
879 | } | |
880 | ||
881 | if (posix_locking) { | |
08547b03 | 882 | int posix_lock_type; |
fb8c4b14 | 883 | if (lockType & LOCKING_ANDX_SHARED_LOCK) |
08547b03 SF |
884 | posix_lock_type = CIFS_RDLCK; |
885 | else | |
886 | posix_lock_type = CIFS_WRLCK; | |
50c2f753 | 887 | |
fb8c4b14 | 888 | if (numUnlock == 1) |
beb84dc8 | 889 | posix_lock_type = CIFS_UNLCK; |
7ee1af76 | 890 | |
13a6e42a | 891 | rc = CIFSSMBPosixLock(xid, tcon, netfid, 0 /* set */, |
fc94cdb9 | 892 | length, pfLock, |
08547b03 | 893 | posix_lock_type, wait_flag); |
7ee1af76 | 894 | } else { |
c21dfb69 | 895 | struct cifsFileInfo *fid = file->private_data; |
7ee1af76 JA |
896 | |
897 | if (numLock) { | |
13a6e42a | 898 | rc = CIFSSMBLock(xid, tcon, netfid, length, |
fb8c4b14 | 899 | pfLock->fl_start, |
7ee1af76 JA |
900 | 0, numLock, lockType, wait_flag); |
901 | ||
902 | if (rc == 0) { | |
903 | /* For Windows locks we must store them. */ | |
904 | rc = store_file_lock(fid, length, | |
905 | pfLock->fl_start, lockType); | |
906 | } | |
907 | } else if (numUnlock) { | |
908 | /* For each stored lock that this unlock overlaps | |
909 | completely, unlock it. */ | |
910 | int stored_rc = 0; | |
911 | struct cifsLockInfo *li, *tmp; | |
912 | ||
6b70c955 | 913 | rc = 0; |
796e5661 | 914 | mutex_lock(&fid->lock_mutex); |
7ee1af76 JA |
915 | list_for_each_entry_safe(li, tmp, &fid->llist, llist) { |
916 | if (pfLock->fl_start <= li->offset && | |
c19eb710 | 917 | (pfLock->fl_start + length) >= |
39db810c | 918 | (li->offset + li->length)) { |
13a6e42a | 919 | stored_rc = CIFSSMBLock(xid, tcon, |
fb8c4b14 | 920 | netfid, |
7ee1af76 | 921 | li->length, li->offset, |
4b18f2a9 | 922 | 1, 0, li->type, false); |
7ee1af76 JA |
923 | if (stored_rc) |
924 | rc = stored_rc; | |
2c964d1f PS |
925 | else { |
926 | list_del(&li->llist); | |
927 | kfree(li); | |
928 | } | |
7ee1af76 JA |
929 | } |
930 | } | |
796e5661 | 931 | mutex_unlock(&fid->lock_mutex); |
7ee1af76 JA |
932 | } |
933 | } | |
934 | ||
d634cc15 | 935 | if (pfLock->fl_flags & FL_POSIX) |
1da177e4 LT |
936 | posix_lock_file_wait(file, pfLock); |
937 | FreeXid(xid); | |
938 | return rc; | |
939 | } | |
940 | ||
fbec9ab9 JL |
941 | /* |
942 | * Set the timeout on write requests past EOF. For some servers (Windows) | |
943 | * these calls can be very long. | |
944 | * | |
945 | * If we're writing >10M past the EOF we give a 180s timeout. Anything less | |
946 | * than that gets a 45s timeout. Writes not past EOF get 15s timeouts. | |
947 | * The 10M cutoff is totally arbitrary. A better scheme for this would be | |
948 | * welcome if someone wants to suggest one. | |
949 | * | |
950 | * We may be able to do a better job with this if there were some way to | |
951 | * declare that a file should be sparse. | |
952 | */ | |
953 | static int | |
954 | cifs_write_timeout(struct cifsInodeInfo *cifsi, loff_t offset) | |
955 | { | |
956 | if (offset <= cifsi->server_eof) | |
957 | return CIFS_STD_OP; | |
958 | else if (offset > (cifsi->server_eof + (10 * 1024 * 1024))) | |
959 | return CIFS_VLONG_OP; | |
960 | else | |
961 | return CIFS_LONG_OP; | |
962 | } | |
963 | ||
964 | /* update the file size (if needed) after a write */ | |
965 | static void | |
966 | cifs_update_eof(struct cifsInodeInfo *cifsi, loff_t offset, | |
967 | unsigned int bytes_written) | |
968 | { | |
969 | loff_t end_of_write = offset + bytes_written; | |
970 | ||
971 | if (end_of_write > cifsi->server_eof) | |
972 | cifsi->server_eof = end_of_write; | |
973 | } | |
974 | ||
1da177e4 LT |
975 | ssize_t cifs_user_write(struct file *file, const char __user *write_data, |
976 | size_t write_size, loff_t *poffset) | |
977 | { | |
978 | int rc = 0; | |
979 | unsigned int bytes_written = 0; | |
980 | unsigned int total_written; | |
981 | struct cifs_sb_info *cifs_sb; | |
982 | struct cifsTconInfo *pTcon; | |
983 | int xid, long_op; | |
984 | struct cifsFileInfo *open_file; | |
fbec9ab9 | 985 | struct cifsInodeInfo *cifsi = CIFS_I(file->f_path.dentry->d_inode); |
1da177e4 | 986 | |
e6a00296 | 987 | cifs_sb = CIFS_SB(file->f_path.dentry->d_sb); |
1da177e4 | 988 | |
b6b38f70 JP |
989 | /* cFYI(1, " write %d bytes to offset %lld of %s", write_size, |
990 | *poffset, file->f_path.dentry->d_name.name); */ | |
1da177e4 LT |
991 | |
992 | if (file->private_data == NULL) | |
993 | return -EBADF; | |
ba00ba64 | 994 | |
c21dfb69 | 995 | open_file = file->private_data; |
13cfb733 | 996 | pTcon = tlink_tcon(open_file->tlink); |
50c2f753 | 997 | |
838726c4 JL |
998 | rc = generic_write_checks(file, poffset, &write_size, 0); |
999 | if (rc) | |
1000 | return rc; | |
1001 | ||
1da177e4 | 1002 | xid = GetXid(); |
1da177e4 | 1003 | |
fbec9ab9 | 1004 | long_op = cifs_write_timeout(cifsi, *poffset); |
1da177e4 LT |
1005 | for (total_written = 0; write_size > total_written; |
1006 | total_written += bytes_written) { | |
1007 | rc = -EAGAIN; | |
1008 | while (rc == -EAGAIN) { | |
1009 | if (file->private_data == NULL) { | |
1010 | /* file has been closed on us */ | |
1011 | FreeXid(xid); | |
1012 | /* if we have gotten here we have written some data | |
1013 | and blocked, and the file has been freed on us while | |
1014 | we blocked so return what we managed to write */ | |
1015 | return total_written; | |
fb8c4b14 | 1016 | } |
1da177e4 LT |
1017 | if (open_file->closePend) { |
1018 | FreeXid(xid); | |
1019 | if (total_written) | |
1020 | return total_written; | |
1021 | else | |
1022 | return -EBADF; | |
1023 | } | |
1024 | if (open_file->invalidHandle) { | |
1da177e4 LT |
1025 | /* we could deadlock if we called |
1026 | filemap_fdatawait from here so tell | |
1027 | reopen_file not to flush data to server | |
1028 | now */ | |
15886177 | 1029 | rc = cifs_reopen_file(open_file, false); |
1da177e4 LT |
1030 | if (rc != 0) |
1031 | break; | |
1032 | } | |
1033 | ||
1034 | rc = CIFSSMBWrite(xid, pTcon, | |
1035 | open_file->netfid, | |
1036 | min_t(const int, cifs_sb->wsize, | |
1037 | write_size - total_written), | |
1038 | *poffset, &bytes_written, | |
1039 | NULL, write_data + total_written, long_op); | |
1040 | } | |
1041 | if (rc || (bytes_written == 0)) { | |
1042 | if (total_written) | |
1043 | break; | |
1044 | else { | |
1045 | FreeXid(xid); | |
1046 | return rc; | |
1047 | } | |
fbec9ab9 JL |
1048 | } else { |
1049 | cifs_update_eof(cifsi, *poffset, bytes_written); | |
1da177e4 | 1050 | *poffset += bytes_written; |
fbec9ab9 | 1051 | } |
133672ef | 1052 | long_op = CIFS_STD_OP; /* subsequent writes fast - |
1da177e4 LT |
1053 | 15 seconds is plenty */ |
1054 | } | |
1055 | ||
a4544347 | 1056 | cifs_stats_bytes_written(pTcon, total_written); |
1da177e4 LT |
1057 | |
1058 | /* since the write may have blocked check these pointers again */ | |
3677db10 SF |
1059 | if ((file->f_path.dentry) && (file->f_path.dentry->d_inode)) { |
1060 | struct inode *inode = file->f_path.dentry->d_inode; | |
fb8c4b14 SF |
1061 | /* Do not update local mtime - server will set its actual value on write |
1062 | * inode->i_ctime = inode->i_mtime = | |
3677db10 SF |
1063 | * current_fs_time(inode->i_sb);*/ |
1064 | if (total_written > 0) { | |
1065 | spin_lock(&inode->i_lock); | |
1066 | if (*poffset > file->f_path.dentry->d_inode->i_size) | |
1067 | i_size_write(file->f_path.dentry->d_inode, | |
1da177e4 | 1068 | *poffset); |
3677db10 | 1069 | spin_unlock(&inode->i_lock); |
1da177e4 | 1070 | } |
fb8c4b14 | 1071 | mark_inode_dirty_sync(file->f_path.dentry->d_inode); |
1da177e4 LT |
1072 | } |
1073 | FreeXid(xid); | |
1074 | return total_written; | |
1075 | } | |
1076 | ||
7da4b49a JL |
1077 | static ssize_t cifs_write(struct cifsFileInfo *open_file, |
1078 | const char *write_data, size_t write_size, | |
1079 | loff_t *poffset) | |
1da177e4 LT |
1080 | { |
1081 | int rc = 0; | |
1082 | unsigned int bytes_written = 0; | |
1083 | unsigned int total_written; | |
1084 | struct cifs_sb_info *cifs_sb; | |
1085 | struct cifsTconInfo *pTcon; | |
1086 | int xid, long_op; | |
7da4b49a JL |
1087 | struct dentry *dentry = open_file->dentry; |
1088 | struct cifsInodeInfo *cifsi = CIFS_I(dentry->d_inode); | |
1da177e4 | 1089 | |
7da4b49a | 1090 | cifs_sb = CIFS_SB(dentry->d_sb); |
1da177e4 | 1091 | |
b6b38f70 | 1092 | cFYI(1, "write %zd bytes to offset %lld of %s", write_size, |
7da4b49a | 1093 | *poffset, dentry->d_name.name); |
1da177e4 | 1094 | |
13cfb733 | 1095 | pTcon = tlink_tcon(open_file->tlink); |
50c2f753 | 1096 | |
1da177e4 | 1097 | xid = GetXid(); |
1da177e4 | 1098 | |
fbec9ab9 | 1099 | long_op = cifs_write_timeout(cifsi, *poffset); |
1da177e4 LT |
1100 | for (total_written = 0; write_size > total_written; |
1101 | total_written += bytes_written) { | |
1102 | rc = -EAGAIN; | |
1103 | while (rc == -EAGAIN) { | |
1da177e4 LT |
1104 | if (open_file->closePend) { |
1105 | FreeXid(xid); | |
1106 | if (total_written) | |
1107 | return total_written; | |
1108 | else | |
1109 | return -EBADF; | |
1110 | } | |
1111 | if (open_file->invalidHandle) { | |
1da177e4 LT |
1112 | /* we could deadlock if we called |
1113 | filemap_fdatawait from here so tell | |
fb8c4b14 | 1114 | reopen_file not to flush data to |
1da177e4 | 1115 | server now */ |
15886177 | 1116 | rc = cifs_reopen_file(open_file, false); |
1da177e4 LT |
1117 | if (rc != 0) |
1118 | break; | |
1119 | } | |
fb8c4b14 SF |
1120 | if (experimEnabled || (pTcon->ses->server && |
1121 | ((pTcon->ses->server->secMode & | |
08775834 | 1122 | (SECMODE_SIGN_REQUIRED | SECMODE_SIGN_ENABLED)) |
c01f36a8 | 1123 | == 0))) { |
3e84469d SF |
1124 | struct kvec iov[2]; |
1125 | unsigned int len; | |
1126 | ||
0ae0efad | 1127 | len = min((size_t)cifs_sb->wsize, |
3e84469d SF |
1128 | write_size - total_written); |
1129 | /* iov[0] is reserved for smb header */ | |
1130 | iov[1].iov_base = (char *)write_data + | |
1131 | total_written; | |
1132 | iov[1].iov_len = len; | |
d6e04ae6 | 1133 | rc = CIFSSMBWrite2(xid, pTcon, |
3e84469d | 1134 | open_file->netfid, len, |
d6e04ae6 | 1135 | *poffset, &bytes_written, |
3e84469d | 1136 | iov, 1, long_op); |
d6e04ae6 | 1137 | } else |
60808233 SF |
1138 | rc = CIFSSMBWrite(xid, pTcon, |
1139 | open_file->netfid, | |
1140 | min_t(const int, cifs_sb->wsize, | |
1141 | write_size - total_written), | |
1142 | *poffset, &bytes_written, | |
1143 | write_data + total_written, | |
1144 | NULL, long_op); | |
1da177e4 LT |
1145 | } |
1146 | if (rc || (bytes_written == 0)) { | |
1147 | if (total_written) | |
1148 | break; | |
1149 | else { | |
1150 | FreeXid(xid); | |
1151 | return rc; | |
1152 | } | |
fbec9ab9 JL |
1153 | } else { |
1154 | cifs_update_eof(cifsi, *poffset, bytes_written); | |
1da177e4 | 1155 | *poffset += bytes_written; |
fbec9ab9 | 1156 | } |
133672ef | 1157 | long_op = CIFS_STD_OP; /* subsequent writes fast - |
1da177e4 LT |
1158 | 15 seconds is plenty */ |
1159 | } | |
1160 | ||
a4544347 | 1161 | cifs_stats_bytes_written(pTcon, total_written); |
1da177e4 | 1162 | |
7da4b49a JL |
1163 | if (total_written > 0) { |
1164 | spin_lock(&dentry->d_inode->i_lock); | |
1165 | if (*poffset > dentry->d_inode->i_size) | |
1166 | i_size_write(dentry->d_inode, *poffset); | |
1167 | spin_unlock(&dentry->d_inode->i_lock); | |
1da177e4 | 1168 | } |
7da4b49a | 1169 | mark_inode_dirty_sync(dentry->d_inode); |
1da177e4 LT |
1170 | FreeXid(xid); |
1171 | return total_written; | |
1172 | } | |
1173 | ||
630f3f0c | 1174 | #ifdef CONFIG_CIFS_EXPERIMENTAL |
6508d904 JL |
1175 | struct cifsFileInfo *find_readable_file(struct cifsInodeInfo *cifs_inode, |
1176 | bool fsuid_only) | |
630f3f0c SF |
1177 | { |
1178 | struct cifsFileInfo *open_file = NULL; | |
6508d904 JL |
1179 | struct cifs_sb_info *cifs_sb = CIFS_SB(cifs_inode->vfs_inode.i_sb); |
1180 | ||
1181 | /* only filter by fsuid on multiuser mounts */ | |
1182 | if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MULTIUSER)) | |
1183 | fsuid_only = false; | |
630f3f0c | 1184 | |
4477288a | 1185 | spin_lock(&cifs_file_list_lock); |
630f3f0c SF |
1186 | /* we could simply get the first_list_entry since write-only entries |
1187 | are always at the end of the list but since the first entry might | |
1188 | have a close pending, we go through the whole list */ | |
1189 | list_for_each_entry(open_file, &cifs_inode->openFileList, flist) { | |
1190 | if (open_file->closePend) | |
1191 | continue; | |
6508d904 JL |
1192 | if (fsuid_only && open_file->uid != current_fsuid()) |
1193 | continue; | |
2e396b83 | 1194 | if (OPEN_FMODE(open_file->f_flags) & FMODE_READ) { |
630f3f0c SF |
1195 | if (!open_file->invalidHandle) { |
1196 | /* found a good file */ | |
1197 | /* lock it so it will not be closed on us */ | |
6ab409b5 | 1198 | cifsFileInfo_get(open_file); |
4477288a | 1199 | spin_unlock(&cifs_file_list_lock); |
630f3f0c SF |
1200 | return open_file; |
1201 | } /* else might as well continue, and look for | |
1202 | another, or simply have the caller reopen it | |
1203 | again rather than trying to fix this handle */ | |
1204 | } else /* write only file */ | |
1205 | break; /* write only files are last so must be done */ | |
1206 | } | |
4477288a | 1207 | spin_unlock(&cifs_file_list_lock); |
630f3f0c SF |
1208 | return NULL; |
1209 | } | |
1210 | #endif | |
1211 | ||
6508d904 JL |
1212 | struct cifsFileInfo *find_writable_file(struct cifsInodeInfo *cifs_inode, |
1213 | bool fsuid_only) | |
6148a742 SF |
1214 | { |
1215 | struct cifsFileInfo *open_file; | |
6508d904 | 1216 | struct cifs_sb_info *cifs_sb = CIFS_SB(cifs_inode->vfs_inode.i_sb); |
2846d386 | 1217 | bool any_available = false; |
dd99cd80 | 1218 | int rc; |
6148a742 | 1219 | |
60808233 SF |
1220 | /* Having a null inode here (because mapping->host was set to zero by |
1221 | the VFS or MM) should not happen but we had reports of on oops (due to | |
1222 | it being zero) during stress testcases so we need to check for it */ | |
1223 | ||
fb8c4b14 | 1224 | if (cifs_inode == NULL) { |
b6b38f70 | 1225 | cERROR(1, "Null inode passed to cifs_writeable_file"); |
60808233 SF |
1226 | dump_stack(); |
1227 | return NULL; | |
1228 | } | |
1229 | ||
6508d904 JL |
1230 | /* only filter by fsuid on multiuser mounts */ |
1231 | if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MULTIUSER)) | |
1232 | fsuid_only = false; | |
1233 | ||
4477288a | 1234 | spin_lock(&cifs_file_list_lock); |
9b22b0b7 | 1235 | refind_writable: |
6148a742 | 1236 | list_for_each_entry(open_file, &cifs_inode->openFileList, flist) { |
6508d904 JL |
1237 | if (open_file->closePend) |
1238 | continue; | |
1239 | if (!any_available && open_file->pid != current->tgid) | |
1240 | continue; | |
1241 | if (fsuid_only && open_file->uid != current_fsuid()) | |
6148a742 | 1242 | continue; |
2e396b83 | 1243 | if (OPEN_FMODE(open_file->f_flags) & FMODE_WRITE) { |
6ab409b5 | 1244 | cifsFileInfo_get(open_file); |
9b22b0b7 SF |
1245 | |
1246 | if (!open_file->invalidHandle) { | |
1247 | /* found a good writable file */ | |
4477288a | 1248 | spin_unlock(&cifs_file_list_lock); |
9b22b0b7 SF |
1249 | return open_file; |
1250 | } | |
8840dee9 | 1251 | |
4477288a | 1252 | spin_unlock(&cifs_file_list_lock); |
9b22b0b7 | 1253 | /* Had to unlock since following call can block */ |
15886177 | 1254 | rc = cifs_reopen_file(open_file, false); |
8840dee9 | 1255 | if (!rc) { |
9b22b0b7 SF |
1256 | if (!open_file->closePend) |
1257 | return open_file; | |
1258 | else { /* start over in case this was deleted */ | |
1259 | /* since the list could be modified */ | |
4477288a | 1260 | spin_lock(&cifs_file_list_lock); |
6ab409b5 | 1261 | cifsFileInfo_put(open_file); |
9b22b0b7 | 1262 | goto refind_writable; |
37c0eb46 SF |
1263 | } |
1264 | } | |
9b22b0b7 SF |
1265 | |
1266 | /* if it fails, try another handle if possible - | |
1267 | (we can not do this if closePending since | |
1268 | loop could be modified - in which case we | |
1269 | have to start at the beginning of the list | |
1270 | again. Note that it would be bad | |
1271 | to hold up writepages here (rather than | |
1272 | in caller) with continuous retries */ | |
b6b38f70 | 1273 | cFYI(1, "wp failed on reopen file"); |
4477288a | 1274 | spin_lock(&cifs_file_list_lock); |
9b22b0b7 SF |
1275 | /* can not use this handle, no write |
1276 | pending on this one after all */ | |
6ab409b5 | 1277 | cifsFileInfo_put(open_file); |
8840dee9 | 1278 | |
9b22b0b7 SF |
1279 | if (open_file->closePend) /* list could have changed */ |
1280 | goto refind_writable; | |
1281 | /* else we simply continue to the next entry. Thus | |
1282 | we do not loop on reopen errors. If we | |
1283 | can not reopen the file, for example if we | |
1284 | reconnected to a server with another client | |
1285 | racing to delete or lock the file we would not | |
1286 | make progress if we restarted before the beginning | |
1287 | of the loop here. */ | |
6148a742 SF |
1288 | } |
1289 | } | |
2846d386 JL |
1290 | /* couldn't find useable FH with same pid, try any available */ |
1291 | if (!any_available) { | |
1292 | any_available = true; | |
1293 | goto refind_writable; | |
1294 | } | |
4477288a | 1295 | spin_unlock(&cifs_file_list_lock); |
6148a742 SF |
1296 | return NULL; |
1297 | } | |
1298 | ||
1da177e4 LT |
1299 | static int cifs_partialpagewrite(struct page *page, unsigned from, unsigned to) |
1300 | { | |
1301 | struct address_space *mapping = page->mapping; | |
1302 | loff_t offset = (loff_t)page->index << PAGE_CACHE_SHIFT; | |
1303 | char *write_data; | |
1304 | int rc = -EFAULT; | |
1305 | int bytes_written = 0; | |
1306 | struct cifs_sb_info *cifs_sb; | |
1da177e4 | 1307 | struct inode *inode; |
6148a742 | 1308 | struct cifsFileInfo *open_file; |
1da177e4 LT |
1309 | |
1310 | if (!mapping || !mapping->host) | |
1311 | return -EFAULT; | |
1312 | ||
1313 | inode = page->mapping->host; | |
1314 | cifs_sb = CIFS_SB(inode->i_sb); | |
1da177e4 LT |
1315 | |
1316 | offset += (loff_t)from; | |
1317 | write_data = kmap(page); | |
1318 | write_data += from; | |
1319 | ||
1320 | if ((to > PAGE_CACHE_SIZE) || (from > to)) { | |
1321 | kunmap(page); | |
1322 | return -EIO; | |
1323 | } | |
1324 | ||
1325 | /* racing with truncate? */ | |
1326 | if (offset > mapping->host->i_size) { | |
1327 | kunmap(page); | |
1328 | return 0; /* don't care */ | |
1329 | } | |
1330 | ||
1331 | /* check to make sure that we are not extending the file */ | |
1332 | if (mapping->host->i_size - offset < (loff_t)to) | |
fb8c4b14 | 1333 | to = (unsigned)(mapping->host->i_size - offset); |
1da177e4 | 1334 | |
6508d904 | 1335 | open_file = find_writable_file(CIFS_I(mapping->host), false); |
6148a742 | 1336 | if (open_file) { |
7da4b49a JL |
1337 | bytes_written = cifs_write(open_file, write_data, |
1338 | to - from, &offset); | |
6ab409b5 | 1339 | cifsFileInfo_put(open_file); |
1da177e4 | 1340 | /* Does mm or vfs already set times? */ |
6148a742 | 1341 | inode->i_atime = inode->i_mtime = current_fs_time(inode->i_sb); |
bb5a9a04 | 1342 | if ((bytes_written > 0) && (offset)) |
6148a742 | 1343 | rc = 0; |
bb5a9a04 SF |
1344 | else if (bytes_written < 0) |
1345 | rc = bytes_written; | |
6148a742 | 1346 | } else { |
b6b38f70 | 1347 | cFYI(1, "No writeable filehandles for inode"); |
1da177e4 LT |
1348 | rc = -EIO; |
1349 | } | |
1350 | ||
1351 | kunmap(page); | |
1352 | return rc; | |
1353 | } | |
1354 | ||
1da177e4 | 1355 | static int cifs_writepages(struct address_space *mapping, |
37c0eb46 | 1356 | struct writeback_control *wbc) |
1da177e4 | 1357 | { |
37c0eb46 SF |
1358 | struct backing_dev_info *bdi = mapping->backing_dev_info; |
1359 | unsigned int bytes_to_write; | |
1360 | unsigned int bytes_written; | |
1361 | struct cifs_sb_info *cifs_sb; | |
1362 | int done = 0; | |
111ebb6e | 1363 | pgoff_t end; |
37c0eb46 | 1364 | pgoff_t index; |
fb8c4b14 SF |
1365 | int range_whole = 0; |
1366 | struct kvec *iov; | |
84d2f07e | 1367 | int len; |
37c0eb46 SF |
1368 | int n_iov = 0; |
1369 | pgoff_t next; | |
1370 | int nr_pages; | |
1371 | __u64 offset = 0; | |
23e7dd7d | 1372 | struct cifsFileInfo *open_file; |
ba00ba64 | 1373 | struct cifsTconInfo *tcon; |
fbec9ab9 | 1374 | struct cifsInodeInfo *cifsi = CIFS_I(mapping->host); |
37c0eb46 SF |
1375 | struct page *page; |
1376 | struct pagevec pvec; | |
1377 | int rc = 0; | |
1378 | int scanned = 0; | |
fbec9ab9 | 1379 | int xid, long_op; |
1da177e4 | 1380 | |
f3983c21 JL |
1381 | /* |
1382 | * BB: Is this meaningful for a non-block-device file system? | |
1383 | * If it is, we should test it again after we do I/O | |
1384 | */ | |
1385 | if (wbc->nonblocking && bdi_write_congested(bdi)) { | |
1386 | wbc->encountered_congestion = 1; | |
1387 | return 0; | |
1388 | } | |
1389 | ||
37c0eb46 | 1390 | cifs_sb = CIFS_SB(mapping->host->i_sb); |
50c2f753 | 1391 | |
37c0eb46 SF |
1392 | /* |
1393 | * If wsize is smaller that the page cache size, default to writing | |
1394 | * one page at a time via cifs_writepage | |
1395 | */ | |
1396 | if (cifs_sb->wsize < PAGE_CACHE_SIZE) | |
1397 | return generic_writepages(mapping, wbc); | |
1398 | ||
9a0c8230 | 1399 | iov = kmalloc(32 * sizeof(struct kvec), GFP_KERNEL); |
fb8c4b14 | 1400 | if (iov == NULL) |
9a0c8230 SF |
1401 | return generic_writepages(mapping, wbc); |
1402 | ||
37c0eb46 | 1403 | /* |
f3983c21 JL |
1404 | * if there's no open file, then this is likely to fail too, |
1405 | * but it'll at least handle the return. Maybe it should be | |
1406 | * a BUG() instead? | |
37c0eb46 | 1407 | */ |
6508d904 | 1408 | open_file = find_writable_file(CIFS_I(mapping->host), false); |
f3983c21 | 1409 | if (!open_file) { |
9a0c8230 | 1410 | kfree(iov); |
f3983c21 JL |
1411 | return generic_writepages(mapping, wbc); |
1412 | } | |
1413 | ||
13cfb733 | 1414 | tcon = tlink_tcon(open_file->tlink); |
f3983c21 JL |
1415 | if (!experimEnabled && tcon->ses->server->secMode & |
1416 | (SECMODE_SIGN_REQUIRED | SECMODE_SIGN_ENABLED)) { | |
1417 | cifsFileInfo_put(open_file); | |
1418 | return generic_writepages(mapping, wbc); | |
37c0eb46 | 1419 | } |
f3983c21 | 1420 | cifsFileInfo_put(open_file); |
37c0eb46 | 1421 | |
1da177e4 LT |
1422 | xid = GetXid(); |
1423 | ||
37c0eb46 | 1424 | pagevec_init(&pvec, 0); |
111ebb6e | 1425 | if (wbc->range_cyclic) { |
37c0eb46 | 1426 | index = mapping->writeback_index; /* Start from prev offset */ |
111ebb6e OH |
1427 | end = -1; |
1428 | } else { | |
1429 | index = wbc->range_start >> PAGE_CACHE_SHIFT; | |
1430 | end = wbc->range_end >> PAGE_CACHE_SHIFT; | |
1431 | if (wbc->range_start == 0 && wbc->range_end == LLONG_MAX) | |
1432 | range_whole = 1; | |
37c0eb46 SF |
1433 | scanned = 1; |
1434 | } | |
1435 | retry: | |
1436 | while (!done && (index <= end) && | |
1437 | (nr_pages = pagevec_lookup_tag(&pvec, mapping, &index, | |
1438 | PAGECACHE_TAG_DIRTY, | |
1439 | min(end - index, (pgoff_t)PAGEVEC_SIZE - 1) + 1))) { | |
1440 | int first; | |
1441 | unsigned int i; | |
1442 | ||
37c0eb46 SF |
1443 | first = -1; |
1444 | next = 0; | |
1445 | n_iov = 0; | |
1446 | bytes_to_write = 0; | |
1447 | ||
1448 | for (i = 0; i < nr_pages; i++) { | |
1449 | page = pvec.pages[i]; | |
1450 | /* | |
1451 | * At this point we hold neither mapping->tree_lock nor | |
1452 | * lock on the page itself: the page may be truncated or | |
1453 | * invalidated (changing page->mapping to NULL), or even | |
1454 | * swizzled back from swapper_space to tmpfs file | |
1455 | * mapping | |
1456 | */ | |
1457 | ||
1458 | if (first < 0) | |
1459 | lock_page(page); | |
529ae9aa | 1460 | else if (!trylock_page(page)) |
37c0eb46 SF |
1461 | break; |
1462 | ||
1463 | if (unlikely(page->mapping != mapping)) { | |
1464 | unlock_page(page); | |
1465 | break; | |
1466 | } | |
1467 | ||
111ebb6e | 1468 | if (!wbc->range_cyclic && page->index > end) { |
37c0eb46 SF |
1469 | done = 1; |
1470 | unlock_page(page); | |
1471 | break; | |
1472 | } | |
1473 | ||
1474 | if (next && (page->index != next)) { | |
1475 | /* Not next consecutive page */ | |
1476 | unlock_page(page); | |
1477 | break; | |
1478 | } | |
1479 | ||
1480 | if (wbc->sync_mode != WB_SYNC_NONE) | |
1481 | wait_on_page_writeback(page); | |
1482 | ||
1483 | if (PageWriteback(page) || | |
cb876f45 | 1484 | !clear_page_dirty_for_io(page)) { |
37c0eb46 SF |
1485 | unlock_page(page); |
1486 | break; | |
1487 | } | |
84d2f07e | 1488 | |
cb876f45 LT |
1489 | /* |
1490 | * This actually clears the dirty bit in the radix tree. | |
1491 | * See cifs_writepage() for more commentary. | |
1492 | */ | |
1493 | set_page_writeback(page); | |
1494 | ||
84d2f07e SF |
1495 | if (page_offset(page) >= mapping->host->i_size) { |
1496 | done = 1; | |
1497 | unlock_page(page); | |
cb876f45 | 1498 | end_page_writeback(page); |
84d2f07e SF |
1499 | break; |
1500 | } | |
1501 | ||
37c0eb46 SF |
1502 | /* |
1503 | * BB can we get rid of this? pages are held by pvec | |
1504 | */ | |
1505 | page_cache_get(page); | |
1506 | ||
84d2f07e SF |
1507 | len = min(mapping->host->i_size - page_offset(page), |
1508 | (loff_t)PAGE_CACHE_SIZE); | |
1509 | ||
37c0eb46 SF |
1510 | /* reserve iov[0] for the smb header */ |
1511 | n_iov++; | |
1512 | iov[n_iov].iov_base = kmap(page); | |
84d2f07e SF |
1513 | iov[n_iov].iov_len = len; |
1514 | bytes_to_write += len; | |
37c0eb46 SF |
1515 | |
1516 | if (first < 0) { | |
1517 | first = i; | |
1518 | offset = page_offset(page); | |
1519 | } | |
1520 | next = page->index + 1; | |
1521 | if (bytes_to_write + PAGE_CACHE_SIZE > cifs_sb->wsize) | |
1522 | break; | |
1523 | } | |
1524 | if (n_iov) { | |
6508d904 JL |
1525 | open_file = find_writable_file(CIFS_I(mapping->host), |
1526 | false); | |
23e7dd7d | 1527 | if (!open_file) { |
b6b38f70 | 1528 | cERROR(1, "No writable handles for inode"); |
23e7dd7d | 1529 | rc = -EBADF; |
1047abc1 | 1530 | } else { |
fbec9ab9 | 1531 | long_op = cifs_write_timeout(cifsi, offset); |
f3983c21 | 1532 | rc = CIFSSMBWrite2(xid, tcon, open_file->netfid, |
23e7dd7d SF |
1533 | bytes_to_write, offset, |
1534 | &bytes_written, iov, n_iov, | |
fbec9ab9 | 1535 | long_op); |
6ab409b5 | 1536 | cifsFileInfo_put(open_file); |
fbec9ab9 | 1537 | cifs_update_eof(cifsi, offset, bytes_written); |
f3983c21 | 1538 | } |
fbec9ab9 | 1539 | |
f3983c21 JL |
1540 | if (rc || bytes_written < bytes_to_write) { |
1541 | cERROR(1, "Write2 ret %d, wrote %d", | |
1542 | rc, bytes_written); | |
1543 | /* BB what if continued retry is | |
1544 | requested via mount flags? */ | |
1545 | if (rc == -ENOSPC) | |
1546 | set_bit(AS_ENOSPC, &mapping->flags); | |
1547 | else | |
1548 | set_bit(AS_EIO, &mapping->flags); | |
1549 | } else { | |
1550 | cifs_stats_bytes_written(tcon, bytes_written); | |
37c0eb46 | 1551 | } |
f3983c21 | 1552 | |
37c0eb46 SF |
1553 | for (i = 0; i < n_iov; i++) { |
1554 | page = pvec.pages[first + i]; | |
eb9bdaa3 SF |
1555 | /* Should we also set page error on |
1556 | success rc but too little data written? */ | |
1557 | /* BB investigate retry logic on temporary | |
1558 | server crash cases and how recovery works | |
fb8c4b14 SF |
1559 | when page marked as error */ |
1560 | if (rc) | |
eb9bdaa3 | 1561 | SetPageError(page); |
37c0eb46 SF |
1562 | kunmap(page); |
1563 | unlock_page(page); | |
cb876f45 | 1564 | end_page_writeback(page); |
37c0eb46 SF |
1565 | page_cache_release(page); |
1566 | } | |
1567 | if ((wbc->nr_to_write -= n_iov) <= 0) | |
1568 | done = 1; | |
1569 | index = next; | |
b066a48c DK |
1570 | } else |
1571 | /* Need to re-find the pages we skipped */ | |
1572 | index = pvec.pages[0]->index + 1; | |
1573 | ||
37c0eb46 SF |
1574 | pagevec_release(&pvec); |
1575 | } | |
1576 | if (!scanned && !done) { | |
1577 | /* | |
1578 | * We hit the last page and there is more work to be done: wrap | |
1579 | * back to the start of the file | |
1580 | */ | |
1581 | scanned = 1; | |
1582 | index = 0; | |
1583 | goto retry; | |
1584 | } | |
111ebb6e | 1585 | if (wbc->range_cyclic || (range_whole && wbc->nr_to_write > 0)) |
37c0eb46 SF |
1586 | mapping->writeback_index = index; |
1587 | ||
1da177e4 | 1588 | FreeXid(xid); |
9a0c8230 | 1589 | kfree(iov); |
1da177e4 LT |
1590 | return rc; |
1591 | } | |
1da177e4 | 1592 | |
fb8c4b14 | 1593 | static int cifs_writepage(struct page *page, struct writeback_control *wbc) |
1da177e4 LT |
1594 | { |
1595 | int rc = -EFAULT; | |
1596 | int xid; | |
1597 | ||
1598 | xid = GetXid(); | |
1599 | /* BB add check for wbc flags */ | |
1600 | page_cache_get(page); | |
ad7a2926 | 1601 | if (!PageUptodate(page)) |
b6b38f70 | 1602 | cFYI(1, "ppw - page not up to date"); |
cb876f45 LT |
1603 | |
1604 | /* | |
1605 | * Set the "writeback" flag, and clear "dirty" in the radix tree. | |
1606 | * | |
1607 | * A writepage() implementation always needs to do either this, | |
1608 | * or re-dirty the page with "redirty_page_for_writepage()" in | |
1609 | * the case of a failure. | |
1610 | * | |
1611 | * Just unlocking the page will cause the radix tree tag-bits | |
1612 | * to fail to update with the state of the page correctly. | |
1613 | */ | |
fb8c4b14 | 1614 | set_page_writeback(page); |
1da177e4 LT |
1615 | rc = cifs_partialpagewrite(page, 0, PAGE_CACHE_SIZE); |
1616 | SetPageUptodate(page); /* BB add check for error and Clearuptodate? */ | |
1617 | unlock_page(page); | |
cb876f45 LT |
1618 | end_page_writeback(page); |
1619 | page_cache_release(page); | |
1da177e4 LT |
1620 | FreeXid(xid); |
1621 | return rc; | |
1622 | } | |
1623 | ||
d9414774 NP |
1624 | static int cifs_write_end(struct file *file, struct address_space *mapping, |
1625 | loff_t pos, unsigned len, unsigned copied, | |
1626 | struct page *page, void *fsdata) | |
1da177e4 | 1627 | { |
d9414774 NP |
1628 | int rc; |
1629 | struct inode *inode = mapping->host; | |
1da177e4 | 1630 | |
b6b38f70 JP |
1631 | cFYI(1, "write_end for page %p from pos %lld with %d bytes", |
1632 | page, pos, copied); | |
d9414774 | 1633 | |
a98ee8c1 JL |
1634 | if (PageChecked(page)) { |
1635 | if (copied == len) | |
1636 | SetPageUptodate(page); | |
1637 | ClearPageChecked(page); | |
1638 | } else if (!PageUptodate(page) && copied == PAGE_CACHE_SIZE) | |
d9414774 | 1639 | SetPageUptodate(page); |
ad7a2926 | 1640 | |
1da177e4 | 1641 | if (!PageUptodate(page)) { |
d9414774 NP |
1642 | char *page_data; |
1643 | unsigned offset = pos & (PAGE_CACHE_SIZE - 1); | |
1644 | int xid; | |
1645 | ||
1646 | xid = GetXid(); | |
1da177e4 LT |
1647 | /* this is probably better than directly calling |
1648 | partialpage_write since in this function the file handle is | |
1649 | known which we might as well leverage */ | |
1650 | /* BB check if anything else missing out of ppw | |
1651 | such as updating last write time */ | |
1652 | page_data = kmap(page); | |
7da4b49a JL |
1653 | rc = cifs_write(file->private_data, page_data + offset, |
1654 | copied, &pos); | |
d9414774 | 1655 | /* if (rc < 0) should we set writebehind rc? */ |
1da177e4 | 1656 | kunmap(page); |
d9414774 NP |
1657 | |
1658 | FreeXid(xid); | |
fb8c4b14 | 1659 | } else { |
d9414774 NP |
1660 | rc = copied; |
1661 | pos += copied; | |
1da177e4 LT |
1662 | set_page_dirty(page); |
1663 | } | |
1664 | ||
d9414774 NP |
1665 | if (rc > 0) { |
1666 | spin_lock(&inode->i_lock); | |
1667 | if (pos > inode->i_size) | |
1668 | i_size_write(inode, pos); | |
1669 | spin_unlock(&inode->i_lock); | |
1670 | } | |
1671 | ||
1672 | unlock_page(page); | |
1673 | page_cache_release(page); | |
1674 | ||
1da177e4 LT |
1675 | return rc; |
1676 | } | |
1677 | ||
7ea80859 | 1678 | int cifs_fsync(struct file *file, int datasync) |
1da177e4 LT |
1679 | { |
1680 | int xid; | |
1681 | int rc = 0; | |
b298f223 | 1682 | struct cifsTconInfo *tcon; |
c21dfb69 | 1683 | struct cifsFileInfo *smbfile = file->private_data; |
e6a00296 | 1684 | struct inode *inode = file->f_path.dentry->d_inode; |
1da177e4 LT |
1685 | |
1686 | xid = GetXid(); | |
1687 | ||
b6b38f70 | 1688 | cFYI(1, "Sync file - name: %s datasync: 0x%x", |
7ea80859 | 1689 | file->f_path.dentry->d_name.name, datasync); |
50c2f753 | 1690 | |
cea21805 JL |
1691 | rc = filemap_write_and_wait(inode->i_mapping); |
1692 | if (rc == 0) { | |
1693 | rc = CIFS_I(inode)->write_behind_rc; | |
1da177e4 | 1694 | CIFS_I(inode)->write_behind_rc = 0; |
13cfb733 | 1695 | tcon = tlink_tcon(smbfile->tlink); |
be652445 | 1696 | if (!rc && tcon && smbfile && |
4717bed6 | 1697 | !(CIFS_SB(inode->i_sb)->mnt_cifs_flags & CIFS_MOUNT_NOSSYNC)) |
b298f223 | 1698 | rc = CIFSSMBFlush(xid, tcon, smbfile->netfid); |
cea21805 | 1699 | } |
b298f223 | 1700 | |
1da177e4 LT |
1701 | FreeXid(xid); |
1702 | return rc; | |
1703 | } | |
1704 | ||
3978d717 | 1705 | /* static void cifs_sync_page(struct page *page) |
1da177e4 LT |
1706 | { |
1707 | struct address_space *mapping; | |
1708 | struct inode *inode; | |
1709 | unsigned long index = page->index; | |
1710 | unsigned int rpages = 0; | |
1711 | int rc = 0; | |
1712 | ||
f19159dc | 1713 | cFYI(1, "sync page %p", page); |
1da177e4 LT |
1714 | mapping = page->mapping; |
1715 | if (!mapping) | |
1716 | return 0; | |
1717 | inode = mapping->host; | |
1718 | if (!inode) | |
3978d717 | 1719 | return; */ |
1da177e4 | 1720 | |
fb8c4b14 | 1721 | /* fill in rpages then |
1da177e4 LT |
1722 | result = cifs_pagein_inode(inode, index, rpages); */ /* BB finish */ |
1723 | ||
b6b38f70 | 1724 | /* cFYI(1, "rpages is %d for sync page of Index %ld", rpages, index); |
1da177e4 | 1725 | |
3978d717 | 1726 | #if 0 |
1da177e4 LT |
1727 | if (rc < 0) |
1728 | return rc; | |
1729 | return 0; | |
3978d717 | 1730 | #endif |
1da177e4 LT |
1731 | } */ |
1732 | ||
1733 | /* | |
1734 | * As file closes, flush all cached write data for this inode checking | |
1735 | * for write behind errors. | |
1736 | */ | |
75e1fcc0 | 1737 | int cifs_flush(struct file *file, fl_owner_t id) |
1da177e4 | 1738 | { |
fb8c4b14 | 1739 | struct inode *inode = file->f_path.dentry->d_inode; |
1da177e4 LT |
1740 | int rc = 0; |
1741 | ||
1742 | /* Rather than do the steps manually: | |
1743 | lock the inode for writing | |
1744 | loop through pages looking for write behind data (dirty pages) | |
1745 | coalesce into contiguous 16K (or smaller) chunks to write to server | |
1746 | send to server (prefer in parallel) | |
1747 | deal with writebehind errors | |
1748 | unlock inode for writing | |
1749 | filemapfdatawrite appears easier for the time being */ | |
1750 | ||
1751 | rc = filemap_fdatawrite(inode->i_mapping); | |
cea21805 JL |
1752 | /* reset wb rc if we were able to write out dirty pages */ |
1753 | if (!rc) { | |
1754 | rc = CIFS_I(inode)->write_behind_rc; | |
1da177e4 | 1755 | CIFS_I(inode)->write_behind_rc = 0; |
cea21805 | 1756 | } |
50c2f753 | 1757 | |
b6b38f70 | 1758 | cFYI(1, "Flush inode %p file %p rc %d", inode, file, rc); |
1da177e4 LT |
1759 | |
1760 | return rc; | |
1761 | } | |
1762 | ||
1763 | ssize_t cifs_user_read(struct file *file, char __user *read_data, | |
1764 | size_t read_size, loff_t *poffset) | |
1765 | { | |
1766 | int rc = -EACCES; | |
1767 | unsigned int bytes_read = 0; | |
1768 | unsigned int total_read = 0; | |
1769 | unsigned int current_read_size; | |
1770 | struct cifs_sb_info *cifs_sb; | |
1771 | struct cifsTconInfo *pTcon; | |
1772 | int xid; | |
1773 | struct cifsFileInfo *open_file; | |
1774 | char *smb_read_data; | |
1775 | char __user *current_offset; | |
1776 | struct smb_com_read_rsp *pSMBr; | |
1777 | ||
1778 | xid = GetXid(); | |
e6a00296 | 1779 | cifs_sb = CIFS_SB(file->f_path.dentry->d_sb); |
1da177e4 LT |
1780 | |
1781 | if (file->private_data == NULL) { | |
0f3bc09e | 1782 | rc = -EBADF; |
1da177e4 | 1783 | FreeXid(xid); |
0f3bc09e | 1784 | return rc; |
1da177e4 | 1785 | } |
c21dfb69 | 1786 | open_file = file->private_data; |
13cfb733 | 1787 | pTcon = tlink_tcon(open_file->tlink); |
1da177e4 | 1788 | |
ad7a2926 | 1789 | if ((file->f_flags & O_ACCMODE) == O_WRONLY) |
b6b38f70 | 1790 | cFYI(1, "attempting read on write only file instance"); |
ad7a2926 | 1791 | |
1da177e4 LT |
1792 | for (total_read = 0, current_offset = read_data; |
1793 | read_size > total_read; | |
1794 | total_read += bytes_read, current_offset += bytes_read) { | |
fb8c4b14 | 1795 | current_read_size = min_t(const int, read_size - total_read, |
1da177e4 LT |
1796 | cifs_sb->rsize); |
1797 | rc = -EAGAIN; | |
1798 | smb_read_data = NULL; | |
1799 | while (rc == -EAGAIN) { | |
ec637e3f | 1800 | int buf_type = CIFS_NO_BUFFER; |
fb8c4b14 | 1801 | if ((open_file->invalidHandle) && |
1da177e4 | 1802 | (!open_file->closePend)) { |
15886177 | 1803 | rc = cifs_reopen_file(open_file, true); |
1da177e4 LT |
1804 | if (rc != 0) |
1805 | break; | |
1806 | } | |
bfa0d75a | 1807 | rc = CIFSSMBRead(xid, pTcon, |
ec637e3f SF |
1808 | open_file->netfid, |
1809 | current_read_size, *poffset, | |
1810 | &bytes_read, &smb_read_data, | |
1811 | &buf_type); | |
1da177e4 | 1812 | pSMBr = (struct smb_com_read_rsp *)smb_read_data; |
1da177e4 | 1813 | if (smb_read_data) { |
93544cc6 SF |
1814 | if (copy_to_user(current_offset, |
1815 | smb_read_data + | |
1816 | 4 /* RFC1001 length field */ + | |
1817 | le16_to_cpu(pSMBr->DataOffset), | |
ad7a2926 | 1818 | bytes_read)) |
93544cc6 | 1819 | rc = -EFAULT; |
93544cc6 | 1820 | |
fb8c4b14 | 1821 | if (buf_type == CIFS_SMALL_BUFFER) |
ec637e3f | 1822 | cifs_small_buf_release(smb_read_data); |
fb8c4b14 | 1823 | else if (buf_type == CIFS_LARGE_BUFFER) |
ec637e3f | 1824 | cifs_buf_release(smb_read_data); |
1da177e4 LT |
1825 | smb_read_data = NULL; |
1826 | } | |
1827 | } | |
1828 | if (rc || (bytes_read == 0)) { | |
1829 | if (total_read) { | |
1830 | break; | |
1831 | } else { | |
1832 | FreeXid(xid); | |
1833 | return rc; | |
1834 | } | |
1835 | } else { | |
a4544347 | 1836 | cifs_stats_bytes_read(pTcon, bytes_read); |
1da177e4 LT |
1837 | *poffset += bytes_read; |
1838 | } | |
1839 | } | |
1840 | FreeXid(xid); | |
1841 | return total_read; | |
1842 | } | |
1843 | ||
1844 | ||
1845 | static ssize_t cifs_read(struct file *file, char *read_data, size_t read_size, | |
1846 | loff_t *poffset) | |
1847 | { | |
1848 | int rc = -EACCES; | |
1849 | unsigned int bytes_read = 0; | |
1850 | unsigned int total_read; | |
1851 | unsigned int current_read_size; | |
1852 | struct cifs_sb_info *cifs_sb; | |
1853 | struct cifsTconInfo *pTcon; | |
1854 | int xid; | |
1855 | char *current_offset; | |
1856 | struct cifsFileInfo *open_file; | |
ec637e3f | 1857 | int buf_type = CIFS_NO_BUFFER; |
1da177e4 LT |
1858 | |
1859 | xid = GetXid(); | |
e6a00296 | 1860 | cifs_sb = CIFS_SB(file->f_path.dentry->d_sb); |
1da177e4 LT |
1861 | |
1862 | if (file->private_data == NULL) { | |
0f3bc09e | 1863 | rc = -EBADF; |
1da177e4 | 1864 | FreeXid(xid); |
0f3bc09e | 1865 | return rc; |
1da177e4 | 1866 | } |
c21dfb69 | 1867 | open_file = file->private_data; |
13cfb733 | 1868 | pTcon = tlink_tcon(open_file->tlink); |
1da177e4 LT |
1869 | |
1870 | if ((file->f_flags & O_ACCMODE) == O_WRONLY) | |
b6b38f70 | 1871 | cFYI(1, "attempting read on write only file instance"); |
1da177e4 | 1872 | |
fb8c4b14 | 1873 | for (total_read = 0, current_offset = read_data; |
1da177e4 LT |
1874 | read_size > total_read; |
1875 | total_read += bytes_read, current_offset += bytes_read) { | |
1876 | current_read_size = min_t(const int, read_size - total_read, | |
1877 | cifs_sb->rsize); | |
f9f5c817 SF |
1878 | /* For windows me and 9x we do not want to request more |
1879 | than it negotiated since it will refuse the read then */ | |
fb8c4b14 | 1880 | if ((pTcon->ses) && |
f9f5c817 SF |
1881 | !(pTcon->ses->capabilities & CAP_LARGE_FILES)) { |
1882 | current_read_size = min_t(const int, current_read_size, | |
1883 | pTcon->ses->server->maxBuf - 128); | |
1884 | } | |
1da177e4 LT |
1885 | rc = -EAGAIN; |
1886 | while (rc == -EAGAIN) { | |
fb8c4b14 | 1887 | if ((open_file->invalidHandle) && |
1da177e4 | 1888 | (!open_file->closePend)) { |
15886177 | 1889 | rc = cifs_reopen_file(open_file, true); |
1da177e4 LT |
1890 | if (rc != 0) |
1891 | break; | |
1892 | } | |
bfa0d75a | 1893 | rc = CIFSSMBRead(xid, pTcon, |
ec637e3f SF |
1894 | open_file->netfid, |
1895 | current_read_size, *poffset, | |
1896 | &bytes_read, ¤t_offset, | |
1897 | &buf_type); | |
1da177e4 LT |
1898 | } |
1899 | if (rc || (bytes_read == 0)) { | |
1900 | if (total_read) { | |
1901 | break; | |
1902 | } else { | |
1903 | FreeXid(xid); | |
1904 | return rc; | |
1905 | } | |
1906 | } else { | |
a4544347 | 1907 | cifs_stats_bytes_read(pTcon, total_read); |
1da177e4 LT |
1908 | *poffset += bytes_read; |
1909 | } | |
1910 | } | |
1911 | FreeXid(xid); | |
1912 | return total_read; | |
1913 | } | |
1914 | ||
1915 | int cifs_file_mmap(struct file *file, struct vm_area_struct *vma) | |
1916 | { | |
1da177e4 LT |
1917 | int rc, xid; |
1918 | ||
1919 | xid = GetXid(); | |
abab095d | 1920 | rc = cifs_revalidate_file(file); |
1da177e4 | 1921 | if (rc) { |
b6b38f70 | 1922 | cFYI(1, "Validation prior to mmap failed, error=%d", rc); |
1da177e4 LT |
1923 | FreeXid(xid); |
1924 | return rc; | |
1925 | } | |
1926 | rc = generic_file_mmap(file, vma); | |
1927 | FreeXid(xid); | |
1928 | return rc; | |
1929 | } | |
1930 | ||
1931 | ||
fb8c4b14 | 1932 | static void cifs_copy_cache_pages(struct address_space *mapping, |
315e995c | 1933 | struct list_head *pages, int bytes_read, char *data) |
1da177e4 LT |
1934 | { |
1935 | struct page *page; | |
1936 | char *target; | |
1937 | ||
1938 | while (bytes_read > 0) { | |
1939 | if (list_empty(pages)) | |
1940 | break; | |
1941 | ||
1942 | page = list_entry(pages->prev, struct page, lru); | |
1943 | list_del(&page->lru); | |
1944 | ||
315e995c | 1945 | if (add_to_page_cache_lru(page, mapping, page->index, |
1da177e4 LT |
1946 | GFP_KERNEL)) { |
1947 | page_cache_release(page); | |
b6b38f70 | 1948 | cFYI(1, "Add page cache failed"); |
3079ca62 SF |
1949 | data += PAGE_CACHE_SIZE; |
1950 | bytes_read -= PAGE_CACHE_SIZE; | |
1da177e4 LT |
1951 | continue; |
1952 | } | |
06b43672 | 1953 | page_cache_release(page); |
1da177e4 | 1954 | |
fb8c4b14 | 1955 | target = kmap_atomic(page, KM_USER0); |
1da177e4 LT |
1956 | |
1957 | if (PAGE_CACHE_SIZE > bytes_read) { | |
1958 | memcpy(target, data, bytes_read); | |
1959 | /* zero the tail end of this partial page */ | |
fb8c4b14 | 1960 | memset(target + bytes_read, 0, |
1da177e4 LT |
1961 | PAGE_CACHE_SIZE - bytes_read); |
1962 | bytes_read = 0; | |
1963 | } else { | |
1964 | memcpy(target, data, PAGE_CACHE_SIZE); | |
1965 | bytes_read -= PAGE_CACHE_SIZE; | |
1966 | } | |
1967 | kunmap_atomic(target, KM_USER0); | |
1968 | ||
1969 | flush_dcache_page(page); | |
1970 | SetPageUptodate(page); | |
1971 | unlock_page(page); | |
1da177e4 | 1972 | data += PAGE_CACHE_SIZE; |
9dc06558 SJ |
1973 | |
1974 | /* add page to FS-Cache */ | |
1975 | cifs_readpage_to_fscache(mapping->host, page); | |
1da177e4 LT |
1976 | } |
1977 | return; | |
1978 | } | |
1979 | ||
1980 | static int cifs_readpages(struct file *file, struct address_space *mapping, | |
1981 | struct list_head *page_list, unsigned num_pages) | |
1982 | { | |
1983 | int rc = -EACCES; | |
1984 | int xid; | |
1985 | loff_t offset; | |
1986 | struct page *page; | |
1987 | struct cifs_sb_info *cifs_sb; | |
1988 | struct cifsTconInfo *pTcon; | |
2c2130e1 | 1989 | unsigned int bytes_read = 0; |
fb8c4b14 | 1990 | unsigned int read_size, i; |
1da177e4 LT |
1991 | char *smb_read_data = NULL; |
1992 | struct smb_com_read_rsp *pSMBr; | |
1da177e4 | 1993 | struct cifsFileInfo *open_file; |
ec637e3f | 1994 | int buf_type = CIFS_NO_BUFFER; |
1da177e4 LT |
1995 | |
1996 | xid = GetXid(); | |
1997 | if (file->private_data == NULL) { | |
0f3bc09e | 1998 | rc = -EBADF; |
1da177e4 | 1999 | FreeXid(xid); |
0f3bc09e | 2000 | return rc; |
1da177e4 | 2001 | } |
c21dfb69 | 2002 | open_file = file->private_data; |
e6a00296 | 2003 | cifs_sb = CIFS_SB(file->f_path.dentry->d_sb); |
13cfb733 | 2004 | pTcon = tlink_tcon(open_file->tlink); |
bfa0d75a | 2005 | |
56698236 SJ |
2006 | /* |
2007 | * Reads as many pages as possible from fscache. Returns -ENOBUFS | |
2008 | * immediately if the cookie is negative | |
2009 | */ | |
2010 | rc = cifs_readpages_from_fscache(mapping->host, mapping, page_list, | |
2011 | &num_pages); | |
2012 | if (rc == 0) | |
2013 | goto read_complete; | |
2014 | ||
f19159dc | 2015 | cFYI(DBG2, "rpages: num pages %d", num_pages); |
1da177e4 LT |
2016 | for (i = 0; i < num_pages; ) { |
2017 | unsigned contig_pages; | |
2018 | struct page *tmp_page; | |
2019 | unsigned long expected_index; | |
2020 | ||
2021 | if (list_empty(page_list)) | |
2022 | break; | |
2023 | ||
2024 | page = list_entry(page_list->prev, struct page, lru); | |
2025 | offset = (loff_t)page->index << PAGE_CACHE_SHIFT; | |
2026 | ||
2027 | /* count adjacent pages that we will read into */ | |
2028 | contig_pages = 0; | |
fb8c4b14 | 2029 | expected_index = |
1da177e4 | 2030 | list_entry(page_list->prev, struct page, lru)->index; |
fb8c4b14 | 2031 | list_for_each_entry_reverse(tmp_page, page_list, lru) { |
1da177e4 LT |
2032 | if (tmp_page->index == expected_index) { |
2033 | contig_pages++; | |
2034 | expected_index++; | |
2035 | } else | |
fb8c4b14 | 2036 | break; |
1da177e4 LT |
2037 | } |
2038 | if (contig_pages + i > num_pages) | |
2039 | contig_pages = num_pages - i; | |
2040 | ||
2041 | /* for reads over a certain size could initiate async | |
2042 | read ahead */ | |
2043 | ||
2044 | read_size = contig_pages * PAGE_CACHE_SIZE; | |
2045 | /* Read size needs to be in multiples of one page */ | |
2046 | read_size = min_t(const unsigned int, read_size, | |
2047 | cifs_sb->rsize & PAGE_CACHE_MASK); | |
b6b38f70 JP |
2048 | cFYI(DBG2, "rpages: read size 0x%x contiguous pages %d", |
2049 | read_size, contig_pages); | |
1da177e4 LT |
2050 | rc = -EAGAIN; |
2051 | while (rc == -EAGAIN) { | |
fb8c4b14 | 2052 | if ((open_file->invalidHandle) && |
1da177e4 | 2053 | (!open_file->closePend)) { |
15886177 | 2054 | rc = cifs_reopen_file(open_file, true); |
1da177e4 LT |
2055 | if (rc != 0) |
2056 | break; | |
2057 | } | |
2058 | ||
bfa0d75a | 2059 | rc = CIFSSMBRead(xid, pTcon, |
ec637e3f SF |
2060 | open_file->netfid, |
2061 | read_size, offset, | |
2062 | &bytes_read, &smb_read_data, | |
2063 | &buf_type); | |
a9d02ad4 | 2064 | /* BB more RC checks ? */ |
fb8c4b14 | 2065 | if (rc == -EAGAIN) { |
1da177e4 | 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 | } | |
2074 | } | |
2075 | if ((rc < 0) || (smb_read_data == NULL)) { | |
b6b38f70 | 2076 | cFYI(1, "Read error in readpages: %d", rc); |
1da177e4 LT |
2077 | break; |
2078 | } else if (bytes_read > 0) { | |
6f88cc2e | 2079 | task_io_account_read(bytes_read); |
1da177e4 LT |
2080 | pSMBr = (struct smb_com_read_rsp *)smb_read_data; |
2081 | cifs_copy_cache_pages(mapping, page_list, bytes_read, | |
2082 | smb_read_data + 4 /* RFC1001 hdr */ + | |
315e995c | 2083 | le16_to_cpu(pSMBr->DataOffset)); |
1da177e4 LT |
2084 | |
2085 | i += bytes_read >> PAGE_CACHE_SHIFT; | |
a4544347 | 2086 | cifs_stats_bytes_read(pTcon, bytes_read); |
2c2130e1 | 2087 | if ((bytes_read & PAGE_CACHE_MASK) != bytes_read) { |
1da177e4 LT |
2088 | i++; /* account for partial page */ |
2089 | ||
fb8c4b14 | 2090 | /* server copy of file can have smaller size |
1da177e4 | 2091 | than client */ |
fb8c4b14 SF |
2092 | /* BB do we need to verify this common case ? |
2093 | this case is ok - if we are at server EOF | |
1da177e4 LT |
2094 | we will hit it on next read */ |
2095 | ||
05ac9d4b | 2096 | /* break; */ |
1da177e4 LT |
2097 | } |
2098 | } else { | |
b6b38f70 | 2099 | cFYI(1, "No bytes read (%d) at offset %lld . " |
f19159dc | 2100 | "Cleaning remaining pages from readahead list", |
b6b38f70 | 2101 | bytes_read, offset); |
fb8c4b14 | 2102 | /* BB turn off caching and do new lookup on |
1da177e4 | 2103 | file size at server? */ |
1da177e4 LT |
2104 | break; |
2105 | } | |
2106 | if (smb_read_data) { | |
fb8c4b14 | 2107 | if (buf_type == CIFS_SMALL_BUFFER) |
ec637e3f | 2108 | cifs_small_buf_release(smb_read_data); |
fb8c4b14 | 2109 | else if (buf_type == CIFS_LARGE_BUFFER) |
ec637e3f | 2110 | cifs_buf_release(smb_read_data); |
1da177e4 LT |
2111 | smb_read_data = NULL; |
2112 | } | |
2113 | bytes_read = 0; | |
2114 | } | |
2115 | ||
1da177e4 LT |
2116 | /* need to free smb_read_data buf before exit */ |
2117 | if (smb_read_data) { | |
fb8c4b14 | 2118 | if (buf_type == CIFS_SMALL_BUFFER) |
47c886b3 | 2119 | cifs_small_buf_release(smb_read_data); |
fb8c4b14 | 2120 | else if (buf_type == CIFS_LARGE_BUFFER) |
47c886b3 | 2121 | cifs_buf_release(smb_read_data); |
1da177e4 | 2122 | smb_read_data = NULL; |
fb8c4b14 | 2123 | } |
1da177e4 | 2124 | |
56698236 | 2125 | read_complete: |
1da177e4 LT |
2126 | FreeXid(xid); |
2127 | return rc; | |
2128 | } | |
2129 | ||
2130 | static int cifs_readpage_worker(struct file *file, struct page *page, | |
2131 | loff_t *poffset) | |
2132 | { | |
2133 | char *read_data; | |
2134 | int rc; | |
2135 | ||
56698236 SJ |
2136 | /* Is the page cached? */ |
2137 | rc = cifs_readpage_from_fscache(file->f_path.dentry->d_inode, page); | |
2138 | if (rc == 0) | |
2139 | goto read_complete; | |
2140 | ||
1da177e4 LT |
2141 | page_cache_get(page); |
2142 | read_data = kmap(page); | |
2143 | /* for reads over a certain size could initiate async read ahead */ | |
fb8c4b14 | 2144 | |
1da177e4 | 2145 | rc = cifs_read(file, read_data, PAGE_CACHE_SIZE, poffset); |
fb8c4b14 | 2146 | |
1da177e4 LT |
2147 | if (rc < 0) |
2148 | goto io_error; | |
2149 | else | |
b6b38f70 | 2150 | cFYI(1, "Bytes read %d", rc); |
fb8c4b14 | 2151 | |
e6a00296 JJS |
2152 | file->f_path.dentry->d_inode->i_atime = |
2153 | current_fs_time(file->f_path.dentry->d_inode->i_sb); | |
fb8c4b14 | 2154 | |
1da177e4 LT |
2155 | if (PAGE_CACHE_SIZE > rc) |
2156 | memset(read_data + rc, 0, PAGE_CACHE_SIZE - rc); | |
2157 | ||
2158 | flush_dcache_page(page); | |
2159 | SetPageUptodate(page); | |
9dc06558 SJ |
2160 | |
2161 | /* send this page to the cache */ | |
2162 | cifs_readpage_to_fscache(file->f_path.dentry->d_inode, page); | |
2163 | ||
1da177e4 | 2164 | rc = 0; |
fb8c4b14 | 2165 | |
1da177e4 | 2166 | io_error: |
fb8c4b14 | 2167 | kunmap(page); |
1da177e4 | 2168 | page_cache_release(page); |
56698236 SJ |
2169 | |
2170 | read_complete: | |
1da177e4 LT |
2171 | return rc; |
2172 | } | |
2173 | ||
2174 | static int cifs_readpage(struct file *file, struct page *page) | |
2175 | { | |
2176 | loff_t offset = (loff_t)page->index << PAGE_CACHE_SHIFT; | |
2177 | int rc = -EACCES; | |
2178 | int xid; | |
2179 | ||
2180 | xid = GetXid(); | |
2181 | ||
2182 | if (file->private_data == NULL) { | |
0f3bc09e | 2183 | rc = -EBADF; |
1da177e4 | 2184 | FreeXid(xid); |
0f3bc09e | 2185 | return rc; |
1da177e4 LT |
2186 | } |
2187 | ||
b6b38f70 JP |
2188 | cFYI(1, "readpage %p at offset %d 0x%x\n", |
2189 | page, (int)offset, (int)offset); | |
1da177e4 LT |
2190 | |
2191 | rc = cifs_readpage_worker(file, page, &offset); | |
2192 | ||
2193 | unlock_page(page); | |
2194 | ||
2195 | FreeXid(xid); | |
2196 | return rc; | |
2197 | } | |
2198 | ||
a403a0a3 SF |
2199 | static int is_inode_writable(struct cifsInodeInfo *cifs_inode) |
2200 | { | |
2201 | struct cifsFileInfo *open_file; | |
2202 | ||
4477288a | 2203 | spin_lock(&cifs_file_list_lock); |
a403a0a3 SF |
2204 | list_for_each_entry(open_file, &cifs_inode->openFileList, flist) { |
2205 | if (open_file->closePend) | |
2206 | continue; | |
2e396b83 | 2207 | if (OPEN_FMODE(open_file->f_flags) & FMODE_WRITE) { |
4477288a | 2208 | spin_unlock(&cifs_file_list_lock); |
a403a0a3 SF |
2209 | return 1; |
2210 | } | |
2211 | } | |
4477288a | 2212 | spin_unlock(&cifs_file_list_lock); |
a403a0a3 SF |
2213 | return 0; |
2214 | } | |
2215 | ||
1da177e4 LT |
2216 | /* We do not want to update the file size from server for inodes |
2217 | open for write - to avoid races with writepage extending | |
2218 | the file - in the future we could consider allowing | |
fb8c4b14 | 2219 | refreshing the inode only on increases in the file size |
1da177e4 LT |
2220 | but this is tricky to do without racing with writebehind |
2221 | page caching in the current Linux kernel design */ | |
4b18f2a9 | 2222 | bool is_size_safe_to_change(struct cifsInodeInfo *cifsInode, __u64 end_of_file) |
1da177e4 | 2223 | { |
a403a0a3 | 2224 | if (!cifsInode) |
4b18f2a9 | 2225 | return true; |
50c2f753 | 2226 | |
a403a0a3 SF |
2227 | if (is_inode_writable(cifsInode)) { |
2228 | /* This inode is open for write at least once */ | |
c32a0b68 SF |
2229 | struct cifs_sb_info *cifs_sb; |
2230 | ||
c32a0b68 | 2231 | cifs_sb = CIFS_SB(cifsInode->vfs_inode.i_sb); |
ad7a2926 | 2232 | if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DIRECT_IO) { |
fb8c4b14 | 2233 | /* since no page cache to corrupt on directio |
c32a0b68 | 2234 | we can change size safely */ |
4b18f2a9 | 2235 | return true; |
c32a0b68 SF |
2236 | } |
2237 | ||
fb8c4b14 | 2238 | if (i_size_read(&cifsInode->vfs_inode) < end_of_file) |
4b18f2a9 | 2239 | return true; |
7ba52631 | 2240 | |
4b18f2a9 | 2241 | return false; |
23e7dd7d | 2242 | } else |
4b18f2a9 | 2243 | return true; |
1da177e4 LT |
2244 | } |
2245 | ||
d9414774 NP |
2246 | static int cifs_write_begin(struct file *file, struct address_space *mapping, |
2247 | loff_t pos, unsigned len, unsigned flags, | |
2248 | struct page **pagep, void **fsdata) | |
1da177e4 | 2249 | { |
d9414774 NP |
2250 | pgoff_t index = pos >> PAGE_CACHE_SHIFT; |
2251 | loff_t offset = pos & (PAGE_CACHE_SIZE - 1); | |
a98ee8c1 JL |
2252 | loff_t page_start = pos & PAGE_MASK; |
2253 | loff_t i_size; | |
2254 | struct page *page; | |
2255 | int rc = 0; | |
d9414774 | 2256 | |
b6b38f70 | 2257 | cFYI(1, "write_begin from %lld len %d", (long long)pos, len); |
d9414774 | 2258 | |
54566b2c | 2259 | page = grab_cache_page_write_begin(mapping, index, flags); |
a98ee8c1 JL |
2260 | if (!page) { |
2261 | rc = -ENOMEM; | |
2262 | goto out; | |
2263 | } | |
8a236264 | 2264 | |
a98ee8c1 JL |
2265 | if (PageUptodate(page)) |
2266 | goto out; | |
8a236264 | 2267 | |
a98ee8c1 JL |
2268 | /* |
2269 | * If we write a full page it will be up to date, no need to read from | |
2270 | * the server. If the write is short, we'll end up doing a sync write | |
2271 | * instead. | |
2272 | */ | |
2273 | if (len == PAGE_CACHE_SIZE) | |
2274 | goto out; | |
8a236264 | 2275 | |
a98ee8c1 JL |
2276 | /* |
2277 | * optimize away the read when we have an oplock, and we're not | |
2278 | * expecting to use any of the data we'd be reading in. That | |
2279 | * is, when the page lies beyond the EOF, or straddles the EOF | |
2280 | * and the write will cover all of the existing data. | |
2281 | */ | |
2282 | if (CIFS_I(mapping->host)->clientCanCacheRead) { | |
2283 | i_size = i_size_read(mapping->host); | |
2284 | if (page_start >= i_size || | |
2285 | (offset == 0 && (pos + len) >= i_size)) { | |
2286 | zero_user_segments(page, 0, offset, | |
2287 | offset + len, | |
2288 | PAGE_CACHE_SIZE); | |
2289 | /* | |
2290 | * PageChecked means that the parts of the page | |
2291 | * to which we're not writing are considered up | |
2292 | * to date. Once the data is copied to the | |
2293 | * page, it can be set uptodate. | |
2294 | */ | |
2295 | SetPageChecked(page); | |
2296 | goto out; | |
2297 | } | |
2298 | } | |
d9414774 | 2299 | |
a98ee8c1 JL |
2300 | if ((file->f_flags & O_ACCMODE) != O_WRONLY) { |
2301 | /* | |
2302 | * might as well read a page, it is fast enough. If we get | |
2303 | * an error, we don't need to return it. cifs_write_end will | |
2304 | * do a sync write instead since PG_uptodate isn't set. | |
2305 | */ | |
2306 | cifs_readpage_worker(file, page, &page_start); | |
8a236264 SF |
2307 | } else { |
2308 | /* we could try using another file handle if there is one - | |
2309 | but how would we lock it to prevent close of that handle | |
2310 | racing with this read? In any case | |
d9414774 | 2311 | this will be written out by write_end so is fine */ |
1da177e4 | 2312 | } |
a98ee8c1 JL |
2313 | out: |
2314 | *pagep = page; | |
2315 | return rc; | |
1da177e4 LT |
2316 | } |
2317 | ||
85f2d6b4 SJ |
2318 | static int cifs_release_page(struct page *page, gfp_t gfp) |
2319 | { | |
2320 | if (PagePrivate(page)) | |
2321 | return 0; | |
2322 | ||
2323 | return cifs_fscache_release_page(page, gfp); | |
2324 | } | |
2325 | ||
2326 | static void cifs_invalidate_page(struct page *page, unsigned long offset) | |
2327 | { | |
2328 | struct cifsInodeInfo *cifsi = CIFS_I(page->mapping->host); | |
2329 | ||
2330 | if (offset == 0) | |
2331 | cifs_fscache_invalidate_page(page, &cifsi->vfs_inode); | |
2332 | } | |
2333 | ||
9b646972 | 2334 | void cifs_oplock_break(struct work_struct *work) |
3bc303c2 JL |
2335 | { |
2336 | struct cifsFileInfo *cfile = container_of(work, struct cifsFileInfo, | |
2337 | oplock_break); | |
a5e18bc3 | 2338 | struct inode *inode = cfile->dentry->d_inode; |
3bc303c2 | 2339 | struct cifsInodeInfo *cinode = CIFS_I(inode); |
3bc303c2 JL |
2340 | int rc, waitrc = 0; |
2341 | ||
2342 | if (inode && S_ISREG(inode->i_mode)) { | |
d54ff732 | 2343 | if (cinode->clientCanCacheRead) |
8737c930 | 2344 | break_lease(inode, O_RDONLY); |
d54ff732 | 2345 | else |
8737c930 | 2346 | break_lease(inode, O_WRONLY); |
3bc303c2 JL |
2347 | rc = filemap_fdatawrite(inode->i_mapping); |
2348 | if (cinode->clientCanCacheRead == 0) { | |
2349 | waitrc = filemap_fdatawait(inode->i_mapping); | |
2350 | invalidate_remote_inode(inode); | |
2351 | } | |
2352 | if (!rc) | |
2353 | rc = waitrc; | |
2354 | if (rc) | |
2355 | cinode->write_behind_rc = rc; | |
b6b38f70 | 2356 | cFYI(1, "Oplock flush inode %p rc %d", inode, rc); |
3bc303c2 JL |
2357 | } |
2358 | ||
2359 | /* | |
2360 | * releasing stale oplock after recent reconnect of smb session using | |
2361 | * a now incorrect file handle is not a data integrity issue but do | |
2362 | * not bother sending an oplock release if session to server still is | |
2363 | * disconnected since oplock already released by the server | |
2364 | */ | |
2365 | if (!cfile->closePend && !cfile->oplock_break_cancelled) { | |
13cfb733 JL |
2366 | rc = CIFSSMBLock(0, tlink_tcon(cfile->tlink), cfile->netfid, 0, |
2367 | 0, 0, 0, LOCKING_ANDX_OPLOCK_RELEASE, false); | |
b6b38f70 | 2368 | cFYI(1, "Oplock release rc = %d", rc); |
3bc303c2 | 2369 | } |
9b646972 TH |
2370 | |
2371 | /* | |
2372 | * We might have kicked in before is_valid_oplock_break() | |
2373 | * finished grabbing reference for us. Make sure it's done by | |
2374 | * waiting for GlobalSMSSeslock. | |
2375 | */ | |
4477288a JL |
2376 | spin_lock(&cifs_file_list_lock); |
2377 | spin_unlock(&cifs_file_list_lock); | |
9b646972 TH |
2378 | |
2379 | cifs_oplock_break_put(cfile); | |
3bc303c2 JL |
2380 | } |
2381 | ||
9b646972 | 2382 | void cifs_oplock_break_get(struct cifsFileInfo *cfile) |
3bc303c2 | 2383 | { |
d7c86ff8 | 2384 | cifs_sb_active(cfile->dentry->d_sb); |
3bc303c2 | 2385 | cifsFileInfo_get(cfile); |
3bc303c2 JL |
2386 | } |
2387 | ||
9b646972 | 2388 | void cifs_oplock_break_put(struct cifsFileInfo *cfile) |
3bc303c2 | 2389 | { |
3bc303c2 | 2390 | cifsFileInfo_put(cfile); |
d7c86ff8 | 2391 | cifs_sb_deactive(cfile->dentry->d_sb); |
3bc303c2 JL |
2392 | } |
2393 | ||
f5e54d6e | 2394 | const struct address_space_operations cifs_addr_ops = { |
1da177e4 LT |
2395 | .readpage = cifs_readpage, |
2396 | .readpages = cifs_readpages, | |
2397 | .writepage = cifs_writepage, | |
37c0eb46 | 2398 | .writepages = cifs_writepages, |
d9414774 NP |
2399 | .write_begin = cifs_write_begin, |
2400 | .write_end = cifs_write_end, | |
1da177e4 | 2401 | .set_page_dirty = __set_page_dirty_nobuffers, |
85f2d6b4 SJ |
2402 | .releasepage = cifs_release_page, |
2403 | .invalidatepage = cifs_invalidate_page, | |
1da177e4 LT |
2404 | /* .sync_page = cifs_sync_page, */ |
2405 | /* .direct_IO = */ | |
2406 | }; | |
273d81d6 DK |
2407 | |
2408 | /* | |
2409 | * cifs_readpages requires the server to support a buffer large enough to | |
2410 | * contain the header plus one complete page of data. Otherwise, we need | |
2411 | * to leave cifs_readpages out of the address space operations. | |
2412 | */ | |
f5e54d6e | 2413 | const struct address_space_operations cifs_addr_ops_smallbuf = { |
273d81d6 DK |
2414 | .readpage = cifs_readpage, |
2415 | .writepage = cifs_writepage, | |
2416 | .writepages = cifs_writepages, | |
d9414774 NP |
2417 | .write_begin = cifs_write_begin, |
2418 | .write_end = cifs_write_end, | |
273d81d6 | 2419 | .set_page_dirty = __set_page_dirty_nobuffers, |
85f2d6b4 SJ |
2420 | .releasepage = cifs_release_page, |
2421 | .invalidatepage = cifs_invalidate_page, | |
273d81d6 DK |
2422 | /* .sync_page = cifs_sync_page, */ |
2423 | /* .direct_IO = */ | |
2424 | }; |