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Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * fs/cifs/file.c | |
3 | * | |
4 | * vfs operations that deal with files | |
fb8c4b14 | 5 | * |
f19159dc | 6 | * Copyright (C) International Business Machines Corp., 2002,2010 |
1da177e4 | 7 | * Author(s): Steve French (sfrench@us.ibm.com) |
7ee1af76 | 8 | * Jeremy Allison (jra@samba.org) |
1da177e4 LT |
9 | * |
10 | * This library is free software; you can redistribute it and/or modify | |
11 | * it under the terms of the GNU Lesser General Public License as published | |
12 | * by the Free Software Foundation; either version 2.1 of the License, or | |
13 | * (at your option) any later version. | |
14 | * | |
15 | * This library is distributed in the hope that it will be useful, | |
16 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
17 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See | |
18 | * the GNU Lesser General Public License for more details. | |
19 | * | |
20 | * You should have received a copy of the GNU Lesser General Public License | |
21 | * along with this library; if not, write to the Free Software | |
22 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA | |
23 | */ | |
24 | #include <linux/fs.h> | |
37c0eb46 | 25 | #include <linux/backing-dev.h> |
1da177e4 LT |
26 | #include <linux/stat.h> |
27 | #include <linux/fcntl.h> | |
28 | #include <linux/pagemap.h> | |
29 | #include <linux/pagevec.h> | |
37c0eb46 | 30 | #include <linux/writeback.h> |
6f88cc2e | 31 | #include <linux/task_io_accounting_ops.h> |
23e7dd7d | 32 | #include <linux/delay.h> |
3bc303c2 | 33 | #include <linux/mount.h> |
5a0e3ad6 | 34 | #include <linux/slab.h> |
690c5e31 | 35 | #include <linux/swap.h> |
1da177e4 LT |
36 | #include <asm/div64.h> |
37 | #include "cifsfs.h" | |
38 | #include "cifspdu.h" | |
39 | #include "cifsglob.h" | |
40 | #include "cifsproto.h" | |
41 | #include "cifs_unicode.h" | |
42 | #include "cifs_debug.h" | |
43 | #include "cifs_fs_sb.h" | |
9451a9a5 | 44 | #include "fscache.h" |
1da177e4 | 45 | |
1da177e4 LT |
46 | static inline int cifs_convert_flags(unsigned int flags) |
47 | { | |
48 | if ((flags & O_ACCMODE) == O_RDONLY) | |
49 | return GENERIC_READ; | |
50 | else if ((flags & O_ACCMODE) == O_WRONLY) | |
51 | return GENERIC_WRITE; | |
52 | else if ((flags & O_ACCMODE) == O_RDWR) { | |
53 | /* GENERIC_ALL is too much permission to request | |
54 | can cause unnecessary access denied on create */ | |
55 | /* return GENERIC_ALL; */ | |
56 | return (GENERIC_READ | GENERIC_WRITE); | |
57 | } | |
58 | ||
e10f7b55 JL |
59 | return (READ_CONTROL | FILE_WRITE_ATTRIBUTES | FILE_READ_ATTRIBUTES | |
60 | FILE_WRITE_EA | FILE_APPEND_DATA | FILE_WRITE_DATA | | |
61 | FILE_READ_DATA); | |
7fc8f4e9 | 62 | } |
e10f7b55 | 63 | |
608712fe | 64 | static u32 cifs_posix_convert_flags(unsigned int flags) |
7fc8f4e9 | 65 | { |
608712fe | 66 | u32 posix_flags = 0; |
e10f7b55 | 67 | |
7fc8f4e9 | 68 | if ((flags & O_ACCMODE) == O_RDONLY) |
608712fe | 69 | posix_flags = SMB_O_RDONLY; |
7fc8f4e9 | 70 | else if ((flags & O_ACCMODE) == O_WRONLY) |
608712fe JL |
71 | posix_flags = SMB_O_WRONLY; |
72 | else if ((flags & O_ACCMODE) == O_RDWR) | |
73 | posix_flags = SMB_O_RDWR; | |
74 | ||
75 | if (flags & O_CREAT) | |
76 | posix_flags |= SMB_O_CREAT; | |
77 | if (flags & O_EXCL) | |
78 | posix_flags |= SMB_O_EXCL; | |
79 | if (flags & O_TRUNC) | |
80 | posix_flags |= SMB_O_TRUNC; | |
81 | /* be safe and imply O_SYNC for O_DSYNC */ | |
6b2f3d1f | 82 | if (flags & O_DSYNC) |
608712fe | 83 | posix_flags |= SMB_O_SYNC; |
7fc8f4e9 | 84 | if (flags & O_DIRECTORY) |
608712fe | 85 | posix_flags |= SMB_O_DIRECTORY; |
7fc8f4e9 | 86 | if (flags & O_NOFOLLOW) |
608712fe | 87 | posix_flags |= SMB_O_NOFOLLOW; |
7fc8f4e9 | 88 | if (flags & O_DIRECT) |
608712fe | 89 | posix_flags |= SMB_O_DIRECT; |
7fc8f4e9 SF |
90 | |
91 | return posix_flags; | |
1da177e4 LT |
92 | } |
93 | ||
94 | static inline int cifs_get_disposition(unsigned int flags) | |
95 | { | |
96 | if ((flags & (O_CREAT | O_EXCL)) == (O_CREAT | O_EXCL)) | |
97 | return FILE_CREATE; | |
98 | else if ((flags & (O_CREAT | O_TRUNC)) == (O_CREAT | O_TRUNC)) | |
99 | return FILE_OVERWRITE_IF; | |
100 | else if ((flags & O_CREAT) == O_CREAT) | |
101 | return FILE_OPEN_IF; | |
55aa2e09 SF |
102 | else if ((flags & O_TRUNC) == O_TRUNC) |
103 | return FILE_OVERWRITE; | |
1da177e4 LT |
104 | else |
105 | return FILE_OPEN; | |
106 | } | |
107 | ||
608712fe JL |
108 | int cifs_posix_open(char *full_path, struct inode **pinode, |
109 | struct super_block *sb, int mode, unsigned int f_flags, | |
6d5786a3 | 110 | __u32 *poplock, __u16 *pnetfid, unsigned int xid) |
608712fe JL |
111 | { |
112 | int rc; | |
113 | FILE_UNIX_BASIC_INFO *presp_data; | |
114 | __u32 posix_flags = 0; | |
115 | struct cifs_sb_info *cifs_sb = CIFS_SB(sb); | |
116 | struct cifs_fattr fattr; | |
117 | struct tcon_link *tlink; | |
96daf2b0 | 118 | struct cifs_tcon *tcon; |
608712fe JL |
119 | |
120 | cFYI(1, "posix open %s", full_path); | |
121 | ||
122 | presp_data = kzalloc(sizeof(FILE_UNIX_BASIC_INFO), GFP_KERNEL); | |
123 | if (presp_data == NULL) | |
124 | return -ENOMEM; | |
125 | ||
126 | tlink = cifs_sb_tlink(cifs_sb); | |
127 | if (IS_ERR(tlink)) { | |
128 | rc = PTR_ERR(tlink); | |
129 | goto posix_open_ret; | |
130 | } | |
131 | ||
132 | tcon = tlink_tcon(tlink); | |
133 | mode &= ~current_umask(); | |
134 | ||
135 | posix_flags = cifs_posix_convert_flags(f_flags); | |
136 | rc = CIFSPOSIXCreate(xid, tcon, posix_flags, mode, pnetfid, presp_data, | |
137 | poplock, full_path, cifs_sb->local_nls, | |
138 | cifs_sb->mnt_cifs_flags & | |
139 | CIFS_MOUNT_MAP_SPECIAL_CHR); | |
140 | cifs_put_tlink(tlink); | |
141 | ||
142 | if (rc) | |
143 | goto posix_open_ret; | |
144 | ||
145 | if (presp_data->Type == cpu_to_le32(-1)) | |
146 | goto posix_open_ret; /* open ok, caller does qpathinfo */ | |
147 | ||
148 | if (!pinode) | |
149 | goto posix_open_ret; /* caller does not need info */ | |
150 | ||
151 | cifs_unix_basic_to_fattr(&fattr, presp_data, cifs_sb); | |
152 | ||
153 | /* get new inode and set it up */ | |
154 | if (*pinode == NULL) { | |
155 | cifs_fill_uniqueid(sb, &fattr); | |
156 | *pinode = cifs_iget(sb, &fattr); | |
157 | if (!*pinode) { | |
158 | rc = -ENOMEM; | |
159 | goto posix_open_ret; | |
160 | } | |
161 | } else { | |
162 | cifs_fattr_to_inode(*pinode, &fattr); | |
163 | } | |
164 | ||
165 | posix_open_ret: | |
166 | kfree(presp_data); | |
167 | return rc; | |
168 | } | |
169 | ||
eeb910a6 PS |
170 | static int |
171 | cifs_nt_open(char *full_path, struct inode *inode, struct cifs_sb_info *cifs_sb, | |
fb1214e4 PS |
172 | struct cifs_tcon *tcon, unsigned int f_flags, __u32 *oplock, |
173 | struct cifs_fid *fid, unsigned int xid) | |
eeb910a6 PS |
174 | { |
175 | int rc; | |
fb1214e4 | 176 | int desired_access; |
eeb910a6 | 177 | int disposition; |
3d3ea8e6 | 178 | int create_options = CREATE_NOT_DIR; |
eeb910a6 PS |
179 | FILE_ALL_INFO *buf; |
180 | ||
fb1214e4 PS |
181 | if (!tcon->ses->server->ops->open) |
182 | return -ENOSYS; | |
183 | ||
184 | desired_access = cifs_convert_flags(f_flags); | |
eeb910a6 PS |
185 | |
186 | /********************************************************************* | |
187 | * open flag mapping table: | |
188 | * | |
189 | * POSIX Flag CIFS Disposition | |
190 | * ---------- ---------------- | |
191 | * O_CREAT FILE_OPEN_IF | |
192 | * O_CREAT | O_EXCL FILE_CREATE | |
193 | * O_CREAT | O_TRUNC FILE_OVERWRITE_IF | |
194 | * O_TRUNC FILE_OVERWRITE | |
195 | * none of the above FILE_OPEN | |
196 | * | |
197 | * Note that there is not a direct match between disposition | |
198 | * FILE_SUPERSEDE (ie create whether or not file exists although | |
199 | * O_CREAT | O_TRUNC is similar but truncates the existing | |
200 | * file rather than creating a new file as FILE_SUPERSEDE does | |
201 | * (which uses the attributes / metadata passed in on open call) | |
202 | *? | |
203 | *? O_SYNC is a reasonable match to CIFS writethrough flag | |
204 | *? and the read write flags match reasonably. O_LARGEFILE | |
205 | *? is irrelevant because largefile support is always used | |
206 | *? by this client. Flags O_APPEND, O_DIRECT, O_DIRECTORY, | |
207 | * O_FASYNC, O_NOFOLLOW, O_NONBLOCK need further investigation | |
208 | *********************************************************************/ | |
209 | ||
210 | disposition = cifs_get_disposition(f_flags); | |
211 | ||
212 | /* BB pass O_SYNC flag through on file attributes .. BB */ | |
213 | ||
214 | buf = kmalloc(sizeof(FILE_ALL_INFO), GFP_KERNEL); | |
215 | if (!buf) | |
216 | return -ENOMEM; | |
217 | ||
3d3ea8e6 SP |
218 | if (backup_cred(cifs_sb)) |
219 | create_options |= CREATE_OPEN_BACKUP_INTENT; | |
220 | ||
fb1214e4 PS |
221 | rc = tcon->ses->server->ops->open(xid, tcon, full_path, disposition, |
222 | desired_access, create_options, fid, | |
223 | oplock, buf, cifs_sb); | |
eeb910a6 PS |
224 | |
225 | if (rc) | |
226 | goto out; | |
227 | ||
228 | if (tcon->unix_ext) | |
229 | rc = cifs_get_inode_info_unix(&inode, full_path, inode->i_sb, | |
230 | xid); | |
231 | else | |
232 | rc = cifs_get_inode_info(&inode, full_path, buf, inode->i_sb, | |
fb1214e4 | 233 | xid, &fid->netfid); |
eeb910a6 PS |
234 | |
235 | out: | |
236 | kfree(buf); | |
237 | return rc; | |
238 | } | |
239 | ||
15ecb436 | 240 | struct cifsFileInfo * |
fb1214e4 | 241 | cifs_new_fileinfo(struct cifs_fid *fid, struct file *file, |
15ecb436 JL |
242 | struct tcon_link *tlink, __u32 oplock) |
243 | { | |
244 | struct dentry *dentry = file->f_path.dentry; | |
245 | struct inode *inode = dentry->d_inode; | |
4b4de76e PS |
246 | struct cifsInodeInfo *cinode = CIFS_I(inode); |
247 | struct cifsFileInfo *cfile; | |
248 | ||
249 | cfile = kzalloc(sizeof(struct cifsFileInfo), GFP_KERNEL); | |
250 | if (cfile == NULL) | |
251 | return cfile; | |
252 | ||
253 | cfile->count = 1; | |
4b4de76e PS |
254 | cfile->pid = current->tgid; |
255 | cfile->uid = current_fsuid(); | |
256 | cfile->dentry = dget(dentry); | |
257 | cfile->f_flags = file->f_flags; | |
258 | cfile->invalidHandle = false; | |
259 | cfile->tlink = cifs_get_tlink(tlink); | |
260 | mutex_init(&cfile->fh_mutex); | |
261 | INIT_WORK(&cfile->oplock_break, cifs_oplock_break); | |
262 | INIT_LIST_HEAD(&cfile->llist); | |
fb1214e4 | 263 | tlink_tcon(tlink)->ses->server->ops->set_fid(cfile, fid, oplock); |
15ecb436 | 264 | |
4477288a | 265 | spin_lock(&cifs_file_list_lock); |
4b4de76e | 266 | list_add(&cfile->tlist, &(tlink_tcon(tlink)->openFileList)); |
15ecb436 JL |
267 | /* if readable file instance put first in list*/ |
268 | if (file->f_mode & FMODE_READ) | |
4b4de76e | 269 | list_add(&cfile->flist, &cinode->openFileList); |
15ecb436 | 270 | else |
4b4de76e | 271 | list_add_tail(&cfile->flist, &cinode->openFileList); |
4477288a | 272 | spin_unlock(&cifs_file_list_lock); |
15ecb436 | 273 | |
4b4de76e PS |
274 | file->private_data = cfile; |
275 | return cfile; | |
15ecb436 JL |
276 | } |
277 | ||
85160e03 PS |
278 | static void cifs_del_lock_waiters(struct cifsLockInfo *lock); |
279 | ||
764a1b1a JL |
280 | struct cifsFileInfo * |
281 | cifsFileInfo_get(struct cifsFileInfo *cifs_file) | |
282 | { | |
283 | spin_lock(&cifs_file_list_lock); | |
284 | cifsFileInfo_get_locked(cifs_file); | |
285 | spin_unlock(&cifs_file_list_lock); | |
286 | return cifs_file; | |
287 | } | |
288 | ||
cdff08e7 SF |
289 | /* |
290 | * Release a reference on the file private data. This may involve closing | |
5f6dbc9e JL |
291 | * the filehandle out on the server. Must be called without holding |
292 | * cifs_file_list_lock. | |
cdff08e7 | 293 | */ |
b33879aa JL |
294 | void cifsFileInfo_put(struct cifsFileInfo *cifs_file) |
295 | { | |
e66673e3 | 296 | struct inode *inode = cifs_file->dentry->d_inode; |
96daf2b0 | 297 | struct cifs_tcon *tcon = tlink_tcon(cifs_file->tlink); |
e66673e3 | 298 | struct cifsInodeInfo *cifsi = CIFS_I(inode); |
4f8ba8a0 | 299 | struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb); |
cdff08e7 SF |
300 | struct cifsLockInfo *li, *tmp; |
301 | ||
302 | spin_lock(&cifs_file_list_lock); | |
5f6dbc9e | 303 | if (--cifs_file->count > 0) { |
cdff08e7 SF |
304 | spin_unlock(&cifs_file_list_lock); |
305 | return; | |
306 | } | |
307 | ||
308 | /* remove it from the lists */ | |
309 | list_del(&cifs_file->flist); | |
310 | list_del(&cifs_file->tlist); | |
311 | ||
312 | if (list_empty(&cifsi->openFileList)) { | |
313 | cFYI(1, "closing last open instance for inode %p", | |
314 | cifs_file->dentry->d_inode); | |
25364138 PS |
315 | /* |
316 | * In strict cache mode we need invalidate mapping on the last | |
317 | * close because it may cause a error when we open this file | |
318 | * again and get at least level II oplock. | |
319 | */ | |
4f8ba8a0 PS |
320 | if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_STRICT_IO) |
321 | CIFS_I(inode)->invalid_mapping = true; | |
c6723628 | 322 | cifs_set_oplock_level(cifsi, 0); |
cdff08e7 SF |
323 | } |
324 | spin_unlock(&cifs_file_list_lock); | |
325 | ||
ad635942 JL |
326 | cancel_work_sync(&cifs_file->oplock_break); |
327 | ||
cdff08e7 | 328 | if (!tcon->need_reconnect && !cifs_file->invalidHandle) { |
0ff78a22 | 329 | struct TCP_Server_Info *server = tcon->ses->server; |
6d5786a3 | 330 | unsigned int xid; |
0ff78a22 PS |
331 | int rc = -ENOSYS; |
332 | ||
6d5786a3 | 333 | xid = get_xid(); |
0ff78a22 PS |
334 | if (server->ops->close) |
335 | rc = server->ops->close(xid, tcon, &cifs_file->fid); | |
6d5786a3 | 336 | free_xid(xid); |
cdff08e7 SF |
337 | } |
338 | ||
339 | /* Delete any outstanding lock records. We'll lose them when the file | |
340 | * is closed anyway. | |
341 | */ | |
d59dad2b | 342 | mutex_lock(&cifsi->lock_mutex); |
fbd35aca | 343 | list_for_each_entry_safe(li, tmp, &cifs_file->llist, llist) { |
cdff08e7 | 344 | list_del(&li->llist); |
85160e03 | 345 | cifs_del_lock_waiters(li); |
cdff08e7 | 346 | kfree(li); |
b33879aa | 347 | } |
d59dad2b | 348 | mutex_unlock(&cifsi->lock_mutex); |
cdff08e7 SF |
349 | |
350 | cifs_put_tlink(cifs_file->tlink); | |
351 | dput(cifs_file->dentry); | |
352 | kfree(cifs_file); | |
b33879aa JL |
353 | } |
354 | ||
1da177e4 LT |
355 | int cifs_open(struct inode *inode, struct file *file) |
356 | { | |
357 | int rc = -EACCES; | |
6d5786a3 | 358 | unsigned int xid; |
590a3fe0 | 359 | __u32 oplock; |
1da177e4 | 360 | struct cifs_sb_info *cifs_sb; |
96daf2b0 | 361 | struct cifs_tcon *tcon; |
7ffec372 | 362 | struct tcon_link *tlink; |
fb1214e4 | 363 | struct cifsFileInfo *cfile = NULL; |
1da177e4 | 364 | char *full_path = NULL; |
7e12eddb | 365 | bool posix_open_ok = false; |
fb1214e4 | 366 | struct cifs_fid fid; |
1da177e4 | 367 | |
6d5786a3 | 368 | xid = get_xid(); |
1da177e4 LT |
369 | |
370 | cifs_sb = CIFS_SB(inode->i_sb); | |
7ffec372 JL |
371 | tlink = cifs_sb_tlink(cifs_sb); |
372 | if (IS_ERR(tlink)) { | |
6d5786a3 | 373 | free_xid(xid); |
7ffec372 JL |
374 | return PTR_ERR(tlink); |
375 | } | |
376 | tcon = tlink_tcon(tlink); | |
1da177e4 | 377 | |
e6a00296 | 378 | full_path = build_path_from_dentry(file->f_path.dentry); |
1da177e4 | 379 | if (full_path == NULL) { |
0f3bc09e | 380 | rc = -ENOMEM; |
232341ba | 381 | goto out; |
1da177e4 LT |
382 | } |
383 | ||
b6b38f70 JP |
384 | cFYI(1, "inode = 0x%p file flags are 0x%x for %s", |
385 | inode, file->f_flags, full_path); | |
276a74a4 | 386 | |
10b9b98e | 387 | if (tcon->ses->server->oplocks) |
276a74a4 SF |
388 | oplock = REQ_OPLOCK; |
389 | else | |
390 | oplock = 0; | |
391 | ||
64cc2c63 | 392 | if (!tcon->broken_posix_open && tcon->unix_ext && |
29e20f9c PS |
393 | cap_unix(tcon->ses) && (CIFS_UNIX_POSIX_PATH_OPS_CAP & |
394 | le64_to_cpu(tcon->fsUnixInfo.Capability))) { | |
276a74a4 | 395 | /* can not refresh inode info since size could be stale */ |
2422f676 | 396 | rc = cifs_posix_open(full_path, &inode, inode->i_sb, |
fa588e0c | 397 | cifs_sb->mnt_file_mode /* ignored */, |
fb1214e4 | 398 | file->f_flags, &oplock, &fid.netfid, xid); |
276a74a4 | 399 | if (rc == 0) { |
b6b38f70 | 400 | cFYI(1, "posix open succeeded"); |
7e12eddb | 401 | posix_open_ok = true; |
64cc2c63 SF |
402 | } else if ((rc == -EINVAL) || (rc == -EOPNOTSUPP)) { |
403 | if (tcon->ses->serverNOS) | |
b6b38f70 | 404 | cERROR(1, "server %s of type %s returned" |
64cc2c63 SF |
405 | " unexpected error on SMB posix open" |
406 | ", disabling posix open support." | |
407 | " Check if server update available.", | |
408 | tcon->ses->serverName, | |
b6b38f70 | 409 | tcon->ses->serverNOS); |
64cc2c63 | 410 | tcon->broken_posix_open = true; |
276a74a4 SF |
411 | } else if ((rc != -EIO) && (rc != -EREMOTE) && |
412 | (rc != -EOPNOTSUPP)) /* path not found or net err */ | |
413 | goto out; | |
fb1214e4 PS |
414 | /* |
415 | * Else fallthrough to retry open the old way on network i/o | |
416 | * or DFS errors. | |
417 | */ | |
276a74a4 SF |
418 | } |
419 | ||
7e12eddb PS |
420 | if (!posix_open_ok) { |
421 | rc = cifs_nt_open(full_path, inode, cifs_sb, tcon, | |
fb1214e4 | 422 | file->f_flags, &oplock, &fid, xid); |
7e12eddb PS |
423 | if (rc) |
424 | goto out; | |
425 | } | |
47c78b7f | 426 | |
fb1214e4 PS |
427 | cfile = cifs_new_fileinfo(&fid, file, tlink, oplock); |
428 | if (cfile == NULL) { | |
0ff78a22 PS |
429 | if (tcon->ses->server->ops->close) |
430 | tcon->ses->server->ops->close(xid, tcon, &fid); | |
1da177e4 LT |
431 | rc = -ENOMEM; |
432 | goto out; | |
433 | } | |
1da177e4 | 434 | |
9451a9a5 SJ |
435 | cifs_fscache_set_inode_cookie(inode, file); |
436 | ||
7e12eddb | 437 | if ((oplock & CIFS_CREATE_ACTION) && !posix_open_ok && tcon->unix_ext) { |
fb1214e4 PS |
438 | /* |
439 | * Time to set mode which we can not set earlier due to | |
440 | * problems creating new read-only files. | |
441 | */ | |
7e12eddb PS |
442 | struct cifs_unix_set_info_args args = { |
443 | .mode = inode->i_mode, | |
444 | .uid = NO_CHANGE_64, | |
445 | .gid = NO_CHANGE_64, | |
446 | .ctime = NO_CHANGE_64, | |
447 | .atime = NO_CHANGE_64, | |
448 | .mtime = NO_CHANGE_64, | |
449 | .device = 0, | |
450 | }; | |
fb1214e4 PS |
451 | CIFSSMBUnixSetFileInfo(xid, tcon, &args, fid.netfid, |
452 | cfile->pid); | |
1da177e4 LT |
453 | } |
454 | ||
455 | out: | |
1da177e4 | 456 | kfree(full_path); |
6d5786a3 | 457 | free_xid(xid); |
7ffec372 | 458 | cifs_put_tlink(tlink); |
1da177e4 LT |
459 | return rc; |
460 | } | |
461 | ||
2ae78ba8 PS |
462 | /* |
463 | * Try to reacquire byte range locks that were released when session | |
464 | * to server was lost | |
465 | */ | |
1da177e4 LT |
466 | static int cifs_relock_file(struct cifsFileInfo *cifsFile) |
467 | { | |
468 | int rc = 0; | |
469 | ||
2ae78ba8 | 470 | /* BB list all locks open on this file and relock */ |
1da177e4 LT |
471 | |
472 | return rc; | |
473 | } | |
474 | ||
2ae78ba8 PS |
475 | static int |
476 | cifs_reopen_file(struct cifsFileInfo *cfile, bool can_flush) | |
1da177e4 LT |
477 | { |
478 | int rc = -EACCES; | |
6d5786a3 | 479 | unsigned int xid; |
590a3fe0 | 480 | __u32 oplock; |
1da177e4 | 481 | struct cifs_sb_info *cifs_sb; |
96daf2b0 | 482 | struct cifs_tcon *tcon; |
2ae78ba8 PS |
483 | struct TCP_Server_Info *server; |
484 | struct cifsInodeInfo *cinode; | |
fb8c4b14 | 485 | struct inode *inode; |
1da177e4 | 486 | char *full_path = NULL; |
2ae78ba8 | 487 | int desired_access; |
1da177e4 | 488 | int disposition = FILE_OPEN; |
3d3ea8e6 | 489 | int create_options = CREATE_NOT_DIR; |
2ae78ba8 | 490 | struct cifs_fid fid; |
1da177e4 | 491 | |
6d5786a3 | 492 | xid = get_xid(); |
2ae78ba8 PS |
493 | mutex_lock(&cfile->fh_mutex); |
494 | if (!cfile->invalidHandle) { | |
495 | mutex_unlock(&cfile->fh_mutex); | |
0f3bc09e | 496 | rc = 0; |
6d5786a3 | 497 | free_xid(xid); |
0f3bc09e | 498 | return rc; |
1da177e4 LT |
499 | } |
500 | ||
2ae78ba8 | 501 | inode = cfile->dentry->d_inode; |
1da177e4 | 502 | cifs_sb = CIFS_SB(inode->i_sb); |
2ae78ba8 PS |
503 | tcon = tlink_tcon(cfile->tlink); |
504 | server = tcon->ses->server; | |
505 | ||
506 | /* | |
507 | * Can not grab rename sem here because various ops, including those | |
508 | * that already have the rename sem can end up causing writepage to get | |
509 | * called and if the server was down that means we end up here, and we | |
510 | * can never tell if the caller already has the rename_sem. | |
511 | */ | |
512 | full_path = build_path_from_dentry(cfile->dentry); | |
1da177e4 | 513 | if (full_path == NULL) { |
3a9f462f | 514 | rc = -ENOMEM; |
2ae78ba8 | 515 | mutex_unlock(&cfile->fh_mutex); |
6d5786a3 | 516 | free_xid(xid); |
3a9f462f | 517 | return rc; |
1da177e4 LT |
518 | } |
519 | ||
2ae78ba8 PS |
520 | cFYI(1, "inode = 0x%p file flags 0x%x for %s", inode, cfile->f_flags, |
521 | full_path); | |
1da177e4 | 522 | |
10b9b98e | 523 | if (tcon->ses->server->oplocks) |
1da177e4 LT |
524 | oplock = REQ_OPLOCK; |
525 | else | |
4b18f2a9 | 526 | oplock = 0; |
1da177e4 | 527 | |
29e20f9c | 528 | if (tcon->unix_ext && cap_unix(tcon->ses) && |
7fc8f4e9 | 529 | (CIFS_UNIX_POSIX_PATH_OPS_CAP & |
29e20f9c | 530 | le64_to_cpu(tcon->fsUnixInfo.Capability))) { |
608712fe JL |
531 | /* |
532 | * O_CREAT, O_EXCL and O_TRUNC already had their effect on the | |
533 | * original open. Must mask them off for a reopen. | |
534 | */ | |
2ae78ba8 | 535 | unsigned int oflags = cfile->f_flags & |
15886177 | 536 | ~(O_CREAT | O_EXCL | O_TRUNC); |
608712fe | 537 | |
2422f676 | 538 | rc = cifs_posix_open(full_path, NULL, inode->i_sb, |
2ae78ba8 PS |
539 | cifs_sb->mnt_file_mode /* ignored */, |
540 | oflags, &oplock, &fid.netfid, xid); | |
7fc8f4e9 | 541 | if (rc == 0) { |
b6b38f70 | 542 | cFYI(1, "posix reopen succeeded"); |
7fc8f4e9 SF |
543 | goto reopen_success; |
544 | } | |
2ae78ba8 PS |
545 | /* |
546 | * fallthrough to retry open the old way on errors, especially | |
547 | * in the reconnect path it is important to retry hard | |
548 | */ | |
7fc8f4e9 SF |
549 | } |
550 | ||
2ae78ba8 | 551 | desired_access = cifs_convert_flags(cfile->f_flags); |
7fc8f4e9 | 552 | |
3d3ea8e6 SP |
553 | if (backup_cred(cifs_sb)) |
554 | create_options |= CREATE_OPEN_BACKUP_INTENT; | |
555 | ||
2ae78ba8 PS |
556 | /* |
557 | * Can not refresh inode by passing in file_info buf to be returned by | |
558 | * CIFSSMBOpen and then calling get_inode_info with returned buf since | |
559 | * file might have write behind data that needs to be flushed and server | |
560 | * version of file size can be stale. If we knew for sure that inode was | |
561 | * not dirty locally we could do this. | |
562 | */ | |
563 | rc = server->ops->open(xid, tcon, full_path, disposition, | |
564 | desired_access, create_options, &fid, &oplock, | |
565 | NULL, cifs_sb); | |
1da177e4 | 566 | if (rc) { |
2ae78ba8 PS |
567 | mutex_unlock(&cfile->fh_mutex); |
568 | cFYI(1, "cifs_reopen returned 0x%x", rc); | |
b6b38f70 | 569 | cFYI(1, "oplock: %d", oplock); |
15886177 JL |
570 | goto reopen_error_exit; |
571 | } | |
572 | ||
7fc8f4e9 | 573 | reopen_success: |
2ae78ba8 PS |
574 | cfile->invalidHandle = false; |
575 | mutex_unlock(&cfile->fh_mutex); | |
576 | cinode = CIFS_I(inode); | |
15886177 JL |
577 | |
578 | if (can_flush) { | |
579 | rc = filemap_write_and_wait(inode->i_mapping); | |
eb4b756b | 580 | mapping_set_error(inode->i_mapping, rc); |
15886177 | 581 | |
15886177 | 582 | if (tcon->unix_ext) |
2ae78ba8 PS |
583 | rc = cifs_get_inode_info_unix(&inode, full_path, |
584 | inode->i_sb, xid); | |
15886177 | 585 | else |
2ae78ba8 PS |
586 | rc = cifs_get_inode_info(&inode, full_path, NULL, |
587 | inode->i_sb, xid, NULL); | |
588 | } | |
589 | /* | |
590 | * Else we are writing out data to server already and could deadlock if | |
591 | * we tried to flush data, and since we do not know if we have data that | |
592 | * would invalidate the current end of file on the server we can not go | |
593 | * to the server to get the new inode info. | |
594 | */ | |
595 | ||
596 | server->ops->set_fid(cfile, &fid, oplock); | |
597 | cifs_relock_file(cfile); | |
15886177 JL |
598 | |
599 | reopen_error_exit: | |
1da177e4 | 600 | kfree(full_path); |
6d5786a3 | 601 | free_xid(xid); |
1da177e4 LT |
602 | return rc; |
603 | } | |
604 | ||
605 | int cifs_close(struct inode *inode, struct file *file) | |
606 | { | |
77970693 JL |
607 | if (file->private_data != NULL) { |
608 | cifsFileInfo_put(file->private_data); | |
609 | file->private_data = NULL; | |
610 | } | |
7ee1af76 | 611 | |
cdff08e7 SF |
612 | /* return code from the ->release op is always ignored */ |
613 | return 0; | |
1da177e4 LT |
614 | } |
615 | ||
616 | int cifs_closedir(struct inode *inode, struct file *file) | |
617 | { | |
618 | int rc = 0; | |
6d5786a3 | 619 | unsigned int xid; |
4b4de76e | 620 | struct cifsFileInfo *cfile = file->private_data; |
92fc65a7 PS |
621 | struct cifs_tcon *tcon; |
622 | struct TCP_Server_Info *server; | |
623 | char *buf; | |
1da177e4 | 624 | |
b6b38f70 | 625 | cFYI(1, "Closedir inode = 0x%p", inode); |
1da177e4 | 626 | |
92fc65a7 PS |
627 | if (cfile == NULL) |
628 | return rc; | |
629 | ||
6d5786a3 | 630 | xid = get_xid(); |
92fc65a7 PS |
631 | tcon = tlink_tcon(cfile->tlink); |
632 | server = tcon->ses->server; | |
1da177e4 | 633 | |
92fc65a7 PS |
634 | cFYI(1, "Freeing private data in close dir"); |
635 | spin_lock(&cifs_file_list_lock); | |
636 | if (!cfile->srch_inf.endOfSearch && !cfile->invalidHandle) { | |
637 | cfile->invalidHandle = true; | |
638 | spin_unlock(&cifs_file_list_lock); | |
639 | if (server->ops->close_dir) | |
640 | rc = server->ops->close_dir(xid, tcon, &cfile->fid); | |
641 | else | |
642 | rc = -ENOSYS; | |
643 | cFYI(1, "Closing uncompleted readdir with rc %d", rc); | |
644 | /* not much we can do if it fails anyway, ignore rc */ | |
645 | rc = 0; | |
646 | } else | |
647 | spin_unlock(&cifs_file_list_lock); | |
648 | ||
649 | buf = cfile->srch_inf.ntwrk_buf_start; | |
650 | if (buf) { | |
651 | cFYI(1, "closedir free smb buf in srch struct"); | |
652 | cfile->srch_inf.ntwrk_buf_start = NULL; | |
653 | if (cfile->srch_inf.smallBuf) | |
654 | cifs_small_buf_release(buf); | |
655 | else | |
656 | cifs_buf_release(buf); | |
1da177e4 | 657 | } |
92fc65a7 PS |
658 | |
659 | cifs_put_tlink(cfile->tlink); | |
660 | kfree(file->private_data); | |
661 | file->private_data = NULL; | |
1da177e4 | 662 | /* BB can we lock the filestruct while this is going on? */ |
6d5786a3 | 663 | free_xid(xid); |
1da177e4 LT |
664 | return rc; |
665 | } | |
666 | ||
85160e03 | 667 | static struct cifsLockInfo * |
fbd35aca | 668 | cifs_lock_init(__u64 offset, __u64 length, __u8 type) |
7ee1af76 | 669 | { |
a88b4707 | 670 | struct cifsLockInfo *lock = |
fb8c4b14 | 671 | kmalloc(sizeof(struct cifsLockInfo), GFP_KERNEL); |
a88b4707 PS |
672 | if (!lock) |
673 | return lock; | |
674 | lock->offset = offset; | |
675 | lock->length = length; | |
676 | lock->type = type; | |
a88b4707 PS |
677 | lock->pid = current->tgid; |
678 | INIT_LIST_HEAD(&lock->blist); | |
679 | init_waitqueue_head(&lock->block_q); | |
680 | return lock; | |
85160e03 PS |
681 | } |
682 | ||
683 | static void | |
684 | cifs_del_lock_waiters(struct cifsLockInfo *lock) | |
685 | { | |
686 | struct cifsLockInfo *li, *tmp; | |
687 | list_for_each_entry_safe(li, tmp, &lock->blist, blist) { | |
688 | list_del_init(&li->blist); | |
689 | wake_up(&li->block_q); | |
690 | } | |
691 | } | |
692 | ||
693 | static bool | |
fbd35aca | 694 | cifs_find_fid_lock_conflict(struct cifsFileInfo *cfile, __u64 offset, |
55157dfb | 695 | __u64 length, __u8 type, struct cifsFileInfo *cur, |
fbd35aca | 696 | struct cifsLockInfo **conf_lock) |
85160e03 | 697 | { |
fbd35aca | 698 | struct cifsLockInfo *li; |
106dc538 | 699 | struct TCP_Server_Info *server = tlink_tcon(cfile->tlink)->ses->server; |
85160e03 | 700 | |
fbd35aca | 701 | list_for_each_entry(li, &cfile->llist, llist) { |
85160e03 PS |
702 | if (offset + length <= li->offset || |
703 | offset >= li->offset + li->length) | |
704 | continue; | |
106dc538 | 705 | else if ((type & server->vals->shared_lock_type) && |
55157dfb PS |
706 | ((server->ops->compare_fids(cur, cfile) && |
707 | current->tgid == li->pid) || type == li->type)) | |
85160e03 PS |
708 | continue; |
709 | else { | |
710 | *conf_lock = li; | |
711 | return true; | |
712 | } | |
713 | } | |
714 | return false; | |
715 | } | |
716 | ||
161ebf9f | 717 | static bool |
55157dfb PS |
718 | cifs_find_lock_conflict(struct cifsFileInfo *cfile, __u64 offset, __u64 length, |
719 | __u8 type, struct cifsLockInfo **conf_lock) | |
161ebf9f | 720 | { |
fbd35aca PS |
721 | bool rc = false; |
722 | struct cifsFileInfo *fid, *tmp; | |
55157dfb | 723 | struct cifsInodeInfo *cinode = CIFS_I(cfile->dentry->d_inode); |
fbd35aca PS |
724 | |
725 | spin_lock(&cifs_file_list_lock); | |
726 | list_for_each_entry_safe(fid, tmp, &cinode->openFileList, flist) { | |
727 | rc = cifs_find_fid_lock_conflict(fid, offset, length, type, | |
55157dfb | 728 | cfile, conf_lock); |
fbd35aca PS |
729 | if (rc) |
730 | break; | |
731 | } | |
732 | spin_unlock(&cifs_file_list_lock); | |
733 | ||
734 | return rc; | |
161ebf9f PS |
735 | } |
736 | ||
9a5101c8 PS |
737 | /* |
738 | * Check if there is another lock that prevents us to set the lock (mandatory | |
739 | * style). If such a lock exists, update the flock structure with its | |
740 | * properties. Otherwise, set the flock type to F_UNLCK if we can cache brlocks | |
741 | * or leave it the same if we can't. Returns 0 if we don't need to request to | |
742 | * the server or 1 otherwise. | |
743 | */ | |
85160e03 | 744 | static int |
fbd35aca PS |
745 | cifs_lock_test(struct cifsFileInfo *cfile, __u64 offset, __u64 length, |
746 | __u8 type, struct file_lock *flock) | |
85160e03 PS |
747 | { |
748 | int rc = 0; | |
749 | struct cifsLockInfo *conf_lock; | |
fbd35aca | 750 | struct cifsInodeInfo *cinode = CIFS_I(cfile->dentry->d_inode); |
106dc538 | 751 | struct TCP_Server_Info *server = tlink_tcon(cfile->tlink)->ses->server; |
85160e03 PS |
752 | bool exist; |
753 | ||
754 | mutex_lock(&cinode->lock_mutex); | |
755 | ||
55157dfb PS |
756 | exist = cifs_find_lock_conflict(cfile, offset, length, type, |
757 | &conf_lock); | |
85160e03 PS |
758 | if (exist) { |
759 | flock->fl_start = conf_lock->offset; | |
760 | flock->fl_end = conf_lock->offset + conf_lock->length - 1; | |
761 | flock->fl_pid = conf_lock->pid; | |
106dc538 | 762 | if (conf_lock->type & server->vals->shared_lock_type) |
85160e03 PS |
763 | flock->fl_type = F_RDLCK; |
764 | else | |
765 | flock->fl_type = F_WRLCK; | |
766 | } else if (!cinode->can_cache_brlcks) | |
767 | rc = 1; | |
768 | else | |
769 | flock->fl_type = F_UNLCK; | |
770 | ||
771 | mutex_unlock(&cinode->lock_mutex); | |
772 | return rc; | |
773 | } | |
774 | ||
161ebf9f | 775 | static void |
fbd35aca | 776 | cifs_lock_add(struct cifsFileInfo *cfile, struct cifsLockInfo *lock) |
85160e03 | 777 | { |
fbd35aca | 778 | struct cifsInodeInfo *cinode = CIFS_I(cfile->dentry->d_inode); |
d59dad2b | 779 | mutex_lock(&cinode->lock_mutex); |
fbd35aca | 780 | list_add_tail(&lock->llist, &cfile->llist); |
d59dad2b | 781 | mutex_unlock(&cinode->lock_mutex); |
7ee1af76 JA |
782 | } |
783 | ||
9a5101c8 PS |
784 | /* |
785 | * Set the byte-range lock (mandatory style). Returns: | |
786 | * 1) 0, if we set the lock and don't need to request to the server; | |
787 | * 2) 1, if no locks prevent us but we need to request to the server; | |
788 | * 3) -EACCESS, if there is a lock that prevents us and wait is false. | |
789 | */ | |
85160e03 | 790 | static int |
fbd35aca | 791 | cifs_lock_add_if(struct cifsFileInfo *cfile, struct cifsLockInfo *lock, |
161ebf9f | 792 | bool wait) |
85160e03 | 793 | { |
161ebf9f | 794 | struct cifsLockInfo *conf_lock; |
fbd35aca | 795 | struct cifsInodeInfo *cinode = CIFS_I(cfile->dentry->d_inode); |
85160e03 PS |
796 | bool exist; |
797 | int rc = 0; | |
798 | ||
85160e03 PS |
799 | try_again: |
800 | exist = false; | |
801 | mutex_lock(&cinode->lock_mutex); | |
802 | ||
55157dfb PS |
803 | exist = cifs_find_lock_conflict(cfile, lock->offset, lock->length, |
804 | lock->type, &conf_lock); | |
85160e03 | 805 | if (!exist && cinode->can_cache_brlcks) { |
fbd35aca | 806 | list_add_tail(&lock->llist, &cfile->llist); |
85160e03 PS |
807 | mutex_unlock(&cinode->lock_mutex); |
808 | return rc; | |
809 | } | |
810 | ||
811 | if (!exist) | |
812 | rc = 1; | |
813 | else if (!wait) | |
814 | rc = -EACCES; | |
815 | else { | |
816 | list_add_tail(&lock->blist, &conf_lock->blist); | |
817 | mutex_unlock(&cinode->lock_mutex); | |
818 | rc = wait_event_interruptible(lock->block_q, | |
819 | (lock->blist.prev == &lock->blist) && | |
820 | (lock->blist.next == &lock->blist)); | |
821 | if (!rc) | |
822 | goto try_again; | |
a88b4707 PS |
823 | mutex_lock(&cinode->lock_mutex); |
824 | list_del_init(&lock->blist); | |
85160e03 PS |
825 | } |
826 | ||
85160e03 PS |
827 | mutex_unlock(&cinode->lock_mutex); |
828 | return rc; | |
829 | } | |
830 | ||
9a5101c8 PS |
831 | /* |
832 | * Check if there is another lock that prevents us to set the lock (posix | |
833 | * style). If such a lock exists, update the flock structure with its | |
834 | * properties. Otherwise, set the flock type to F_UNLCK if we can cache brlocks | |
835 | * or leave it the same if we can't. Returns 0 if we don't need to request to | |
836 | * the server or 1 otherwise. | |
837 | */ | |
85160e03 | 838 | static int |
4f6bcec9 PS |
839 | cifs_posix_lock_test(struct file *file, struct file_lock *flock) |
840 | { | |
841 | int rc = 0; | |
842 | struct cifsInodeInfo *cinode = CIFS_I(file->f_path.dentry->d_inode); | |
843 | unsigned char saved_type = flock->fl_type; | |
844 | ||
50792760 PS |
845 | if ((flock->fl_flags & FL_POSIX) == 0) |
846 | return 1; | |
847 | ||
4f6bcec9 PS |
848 | mutex_lock(&cinode->lock_mutex); |
849 | posix_test_lock(file, flock); | |
850 | ||
851 | if (flock->fl_type == F_UNLCK && !cinode->can_cache_brlcks) { | |
852 | flock->fl_type = saved_type; | |
853 | rc = 1; | |
854 | } | |
855 | ||
856 | mutex_unlock(&cinode->lock_mutex); | |
857 | return rc; | |
858 | } | |
859 | ||
9a5101c8 PS |
860 | /* |
861 | * Set the byte-range lock (posix style). Returns: | |
862 | * 1) 0, if we set the lock and don't need to request to the server; | |
863 | * 2) 1, if we need to request to the server; | |
864 | * 3) <0, if the error occurs while setting the lock. | |
865 | */ | |
4f6bcec9 PS |
866 | static int |
867 | cifs_posix_lock_set(struct file *file, struct file_lock *flock) | |
868 | { | |
869 | struct cifsInodeInfo *cinode = CIFS_I(file->f_path.dentry->d_inode); | |
50792760 PS |
870 | int rc = 1; |
871 | ||
872 | if ((flock->fl_flags & FL_POSIX) == 0) | |
873 | return rc; | |
4f6bcec9 | 874 | |
66189be7 | 875 | try_again: |
4f6bcec9 PS |
876 | mutex_lock(&cinode->lock_mutex); |
877 | if (!cinode->can_cache_brlcks) { | |
878 | mutex_unlock(&cinode->lock_mutex); | |
50792760 | 879 | return rc; |
4f6bcec9 | 880 | } |
66189be7 PS |
881 | |
882 | rc = posix_lock_file(file, flock, NULL); | |
9ebb389d | 883 | mutex_unlock(&cinode->lock_mutex); |
66189be7 PS |
884 | if (rc == FILE_LOCK_DEFERRED) { |
885 | rc = wait_event_interruptible(flock->fl_wait, !flock->fl_next); | |
886 | if (!rc) | |
887 | goto try_again; | |
888 | locks_delete_block(flock); | |
889 | } | |
9ebb389d | 890 | return rc; |
4f6bcec9 PS |
891 | } |
892 | ||
893 | static int | |
894 | cifs_push_mandatory_locks(struct cifsFileInfo *cfile) | |
85160e03 | 895 | { |
6d5786a3 PS |
896 | unsigned int xid; |
897 | int rc = 0, stored_rc; | |
85160e03 PS |
898 | struct cifsLockInfo *li, *tmp; |
899 | struct cifs_tcon *tcon; | |
900 | struct cifsInodeInfo *cinode = CIFS_I(cfile->dentry->d_inode); | |
0013fb4c | 901 | unsigned int num, max_num, max_buf; |
32b9aaf1 PS |
902 | LOCKING_ANDX_RANGE *buf, *cur; |
903 | int types[] = {LOCKING_ANDX_LARGE_FILES, | |
904 | LOCKING_ANDX_SHARED_LOCK | LOCKING_ANDX_LARGE_FILES}; | |
905 | int i; | |
85160e03 | 906 | |
6d5786a3 | 907 | xid = get_xid(); |
85160e03 PS |
908 | tcon = tlink_tcon(cfile->tlink); |
909 | ||
910 | mutex_lock(&cinode->lock_mutex); | |
911 | if (!cinode->can_cache_brlcks) { | |
912 | mutex_unlock(&cinode->lock_mutex); | |
6d5786a3 | 913 | free_xid(xid); |
85160e03 PS |
914 | return rc; |
915 | } | |
916 | ||
0013fb4c PS |
917 | /* |
918 | * Accessing maxBuf is racy with cifs_reconnect - need to store value | |
919 | * and check it for zero before using. | |
920 | */ | |
921 | max_buf = tcon->ses->server->maxBuf; | |
922 | if (!max_buf) { | |
923 | mutex_unlock(&cinode->lock_mutex); | |
6d5786a3 | 924 | free_xid(xid); |
0013fb4c PS |
925 | return -EINVAL; |
926 | } | |
927 | ||
928 | max_num = (max_buf - sizeof(struct smb_hdr)) / | |
929 | sizeof(LOCKING_ANDX_RANGE); | |
32b9aaf1 PS |
930 | buf = kzalloc(max_num * sizeof(LOCKING_ANDX_RANGE), GFP_KERNEL); |
931 | if (!buf) { | |
932 | mutex_unlock(&cinode->lock_mutex); | |
6d5786a3 | 933 | free_xid(xid); |
e2f2886a | 934 | return -ENOMEM; |
32b9aaf1 PS |
935 | } |
936 | ||
937 | for (i = 0; i < 2; i++) { | |
938 | cur = buf; | |
939 | num = 0; | |
fbd35aca | 940 | list_for_each_entry_safe(li, tmp, &cfile->llist, llist) { |
32b9aaf1 PS |
941 | if (li->type != types[i]) |
942 | continue; | |
943 | cur->Pid = cpu_to_le16(li->pid); | |
944 | cur->LengthLow = cpu_to_le32((u32)li->length); | |
945 | cur->LengthHigh = cpu_to_le32((u32)(li->length>>32)); | |
946 | cur->OffsetLow = cpu_to_le32((u32)li->offset); | |
947 | cur->OffsetHigh = cpu_to_le32((u32)(li->offset>>32)); | |
948 | if (++num == max_num) { | |
4b4de76e PS |
949 | stored_rc = cifs_lockv(xid, tcon, |
950 | cfile->fid.netfid, | |
04a6aa8a PS |
951 | (__u8)li->type, 0, num, |
952 | buf); | |
32b9aaf1 PS |
953 | if (stored_rc) |
954 | rc = stored_rc; | |
955 | cur = buf; | |
956 | num = 0; | |
957 | } else | |
958 | cur++; | |
959 | } | |
960 | ||
961 | if (num) { | |
4b4de76e | 962 | stored_rc = cifs_lockv(xid, tcon, cfile->fid.netfid, |
04a6aa8a | 963 | (__u8)types[i], 0, num, buf); |
32b9aaf1 PS |
964 | if (stored_rc) |
965 | rc = stored_rc; | |
966 | } | |
85160e03 PS |
967 | } |
968 | ||
969 | cinode->can_cache_brlcks = false; | |
970 | mutex_unlock(&cinode->lock_mutex); | |
971 | ||
32b9aaf1 | 972 | kfree(buf); |
6d5786a3 | 973 | free_xid(xid); |
85160e03 PS |
974 | return rc; |
975 | } | |
976 | ||
4f6bcec9 PS |
977 | /* copied from fs/locks.c with a name change */ |
978 | #define cifs_for_each_lock(inode, lockp) \ | |
979 | for (lockp = &inode->i_flock; *lockp != NULL; \ | |
980 | lockp = &(*lockp)->fl_next) | |
981 | ||
d5751469 PS |
982 | struct lock_to_push { |
983 | struct list_head llist; | |
984 | __u64 offset; | |
985 | __u64 length; | |
986 | __u32 pid; | |
987 | __u16 netfid; | |
988 | __u8 type; | |
989 | }; | |
990 | ||
4f6bcec9 PS |
991 | static int |
992 | cifs_push_posix_locks(struct cifsFileInfo *cfile) | |
993 | { | |
994 | struct cifsInodeInfo *cinode = CIFS_I(cfile->dentry->d_inode); | |
995 | struct cifs_tcon *tcon = tlink_tcon(cfile->tlink); | |
996 | struct file_lock *flock, **before; | |
d5751469 | 997 | unsigned int count = 0, i = 0; |
4f6bcec9 | 998 | int rc = 0, xid, type; |
d5751469 PS |
999 | struct list_head locks_to_send, *el; |
1000 | struct lock_to_push *lck, *tmp; | |
4f6bcec9 | 1001 | __u64 length; |
4f6bcec9 | 1002 | |
6d5786a3 | 1003 | xid = get_xid(); |
4f6bcec9 PS |
1004 | |
1005 | mutex_lock(&cinode->lock_mutex); | |
1006 | if (!cinode->can_cache_brlcks) { | |
1007 | mutex_unlock(&cinode->lock_mutex); | |
6d5786a3 | 1008 | free_xid(xid); |
4f6bcec9 PS |
1009 | return rc; |
1010 | } | |
1011 | ||
d5751469 PS |
1012 | lock_flocks(); |
1013 | cifs_for_each_lock(cfile->dentry->d_inode, before) { | |
1014 | if ((*before)->fl_flags & FL_POSIX) | |
1015 | count++; | |
1016 | } | |
1017 | unlock_flocks(); | |
1018 | ||
4f6bcec9 PS |
1019 | INIT_LIST_HEAD(&locks_to_send); |
1020 | ||
d5751469 | 1021 | /* |
ce85852b PS |
1022 | * Allocating count locks is enough because no FL_POSIX locks can be |
1023 | * added to the list while we are holding cinode->lock_mutex that | |
1024 | * protects locking operations of this inode. | |
d5751469 PS |
1025 | */ |
1026 | for (; i < count; i++) { | |
1027 | lck = kmalloc(sizeof(struct lock_to_push), GFP_KERNEL); | |
1028 | if (!lck) { | |
1029 | rc = -ENOMEM; | |
1030 | goto err_out; | |
1031 | } | |
1032 | list_add_tail(&lck->llist, &locks_to_send); | |
1033 | } | |
1034 | ||
d5751469 | 1035 | el = locks_to_send.next; |
4f6bcec9 PS |
1036 | lock_flocks(); |
1037 | cifs_for_each_lock(cfile->dentry->d_inode, before) { | |
ce85852b PS |
1038 | flock = *before; |
1039 | if ((flock->fl_flags & FL_POSIX) == 0) | |
1040 | continue; | |
d5751469 | 1041 | if (el == &locks_to_send) { |
ce85852b PS |
1042 | /* |
1043 | * The list ended. We don't have enough allocated | |
1044 | * structures - something is really wrong. | |
1045 | */ | |
d5751469 PS |
1046 | cERROR(1, "Can't push all brlocks!"); |
1047 | break; | |
1048 | } | |
4f6bcec9 PS |
1049 | length = 1 + flock->fl_end - flock->fl_start; |
1050 | if (flock->fl_type == F_RDLCK || flock->fl_type == F_SHLCK) | |
1051 | type = CIFS_RDLCK; | |
1052 | else | |
1053 | type = CIFS_WRLCK; | |
d5751469 | 1054 | lck = list_entry(el, struct lock_to_push, llist); |
4f6bcec9 | 1055 | lck->pid = flock->fl_pid; |
4b4de76e | 1056 | lck->netfid = cfile->fid.netfid; |
d5751469 PS |
1057 | lck->length = length; |
1058 | lck->type = type; | |
1059 | lck->offset = flock->fl_start; | |
d5751469 | 1060 | el = el->next; |
4f6bcec9 | 1061 | } |
4f6bcec9 PS |
1062 | unlock_flocks(); |
1063 | ||
1064 | list_for_each_entry_safe(lck, tmp, &locks_to_send, llist) { | |
4f6bcec9 PS |
1065 | int stored_rc; |
1066 | ||
4f6bcec9 | 1067 | stored_rc = CIFSSMBPosixLock(xid, tcon, lck->netfid, lck->pid, |
c5fd363d | 1068 | lck->offset, lck->length, NULL, |
4f6bcec9 PS |
1069 | lck->type, 0); |
1070 | if (stored_rc) | |
1071 | rc = stored_rc; | |
1072 | list_del(&lck->llist); | |
1073 | kfree(lck); | |
1074 | } | |
1075 | ||
d5751469 | 1076 | out: |
4f6bcec9 PS |
1077 | cinode->can_cache_brlcks = false; |
1078 | mutex_unlock(&cinode->lock_mutex); | |
1079 | ||
6d5786a3 | 1080 | free_xid(xid); |
4f6bcec9 | 1081 | return rc; |
d5751469 PS |
1082 | err_out: |
1083 | list_for_each_entry_safe(lck, tmp, &locks_to_send, llist) { | |
1084 | list_del(&lck->llist); | |
1085 | kfree(lck); | |
1086 | } | |
1087 | goto out; | |
4f6bcec9 PS |
1088 | } |
1089 | ||
1090 | static int | |
1091 | cifs_push_locks(struct cifsFileInfo *cfile) | |
1092 | { | |
1093 | struct cifs_sb_info *cifs_sb = CIFS_SB(cfile->dentry->d_sb); | |
1094 | struct cifs_tcon *tcon = tlink_tcon(cfile->tlink); | |
1095 | ||
29e20f9c | 1096 | if (cap_unix(tcon->ses) && |
4f6bcec9 PS |
1097 | (CIFS_UNIX_FCNTL_CAP & le64_to_cpu(tcon->fsUnixInfo.Capability)) && |
1098 | ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NOPOSIXBRL) == 0)) | |
1099 | return cifs_push_posix_locks(cfile); | |
1100 | ||
1101 | return cifs_push_mandatory_locks(cfile); | |
1102 | } | |
1103 | ||
03776f45 | 1104 | static void |
04a6aa8a | 1105 | cifs_read_flock(struct file_lock *flock, __u32 *type, int *lock, int *unlock, |
106dc538 | 1106 | bool *wait_flag, struct TCP_Server_Info *server) |
1da177e4 | 1107 | { |
03776f45 | 1108 | if (flock->fl_flags & FL_POSIX) |
b6b38f70 | 1109 | cFYI(1, "Posix"); |
03776f45 | 1110 | if (flock->fl_flags & FL_FLOCK) |
b6b38f70 | 1111 | cFYI(1, "Flock"); |
03776f45 | 1112 | if (flock->fl_flags & FL_SLEEP) { |
b6b38f70 | 1113 | cFYI(1, "Blocking lock"); |
03776f45 | 1114 | *wait_flag = true; |
1da177e4 | 1115 | } |
03776f45 | 1116 | if (flock->fl_flags & FL_ACCESS) |
b6b38f70 | 1117 | cFYI(1, "Process suspended by mandatory locking - " |
03776f45 PS |
1118 | "not implemented yet"); |
1119 | if (flock->fl_flags & FL_LEASE) | |
b6b38f70 | 1120 | cFYI(1, "Lease on file - not implemented yet"); |
03776f45 | 1121 | if (flock->fl_flags & |
1da177e4 | 1122 | (~(FL_POSIX | FL_FLOCK | FL_SLEEP | FL_ACCESS | FL_LEASE))) |
03776f45 | 1123 | cFYI(1, "Unknown lock flags 0x%x", flock->fl_flags); |
1da177e4 | 1124 | |
106dc538 | 1125 | *type = server->vals->large_lock_type; |
03776f45 | 1126 | if (flock->fl_type == F_WRLCK) { |
b6b38f70 | 1127 | cFYI(1, "F_WRLCK "); |
106dc538 | 1128 | *type |= server->vals->exclusive_lock_type; |
03776f45 PS |
1129 | *lock = 1; |
1130 | } else if (flock->fl_type == F_UNLCK) { | |
b6b38f70 | 1131 | cFYI(1, "F_UNLCK"); |
106dc538 | 1132 | *type |= server->vals->unlock_lock_type; |
03776f45 PS |
1133 | *unlock = 1; |
1134 | /* Check if unlock includes more than one lock range */ | |
1135 | } else if (flock->fl_type == F_RDLCK) { | |
b6b38f70 | 1136 | cFYI(1, "F_RDLCK"); |
106dc538 | 1137 | *type |= server->vals->shared_lock_type; |
03776f45 PS |
1138 | *lock = 1; |
1139 | } else if (flock->fl_type == F_EXLCK) { | |
b6b38f70 | 1140 | cFYI(1, "F_EXLCK"); |
106dc538 | 1141 | *type |= server->vals->exclusive_lock_type; |
03776f45 PS |
1142 | *lock = 1; |
1143 | } else if (flock->fl_type == F_SHLCK) { | |
b6b38f70 | 1144 | cFYI(1, "F_SHLCK"); |
106dc538 | 1145 | *type |= server->vals->shared_lock_type; |
03776f45 | 1146 | *lock = 1; |
1da177e4 | 1147 | } else |
b6b38f70 | 1148 | cFYI(1, "Unknown type of lock"); |
03776f45 | 1149 | } |
1da177e4 | 1150 | |
55157dfb | 1151 | static int |
6d5786a3 | 1152 | cifs_mandatory_lock(unsigned int xid, struct cifsFileInfo *cfile, __u64 offset, |
55157dfb PS |
1153 | __u64 length, __u32 type, int lock, int unlock, bool wait) |
1154 | { | |
4b4de76e | 1155 | return CIFSSMBLock(xid, tlink_tcon(cfile->tlink), cfile->fid.netfid, |
55157dfb PS |
1156 | current->tgid, length, offset, unlock, lock, |
1157 | (__u8)type, wait, 0); | |
1158 | } | |
1159 | ||
03776f45 | 1160 | static int |
04a6aa8a | 1161 | cifs_getlk(struct file *file, struct file_lock *flock, __u32 type, |
6d5786a3 | 1162 | bool wait_flag, bool posix_lck, unsigned int xid) |
03776f45 PS |
1163 | { |
1164 | int rc = 0; | |
1165 | __u64 length = 1 + flock->fl_end - flock->fl_start; | |
4f6bcec9 PS |
1166 | struct cifsFileInfo *cfile = (struct cifsFileInfo *)file->private_data; |
1167 | struct cifs_tcon *tcon = tlink_tcon(cfile->tlink); | |
106dc538 | 1168 | struct TCP_Server_Info *server = tcon->ses->server; |
4b4de76e | 1169 | __u16 netfid = cfile->fid.netfid; |
f05337c6 | 1170 | |
03776f45 PS |
1171 | if (posix_lck) { |
1172 | int posix_lock_type; | |
4f6bcec9 PS |
1173 | |
1174 | rc = cifs_posix_lock_test(file, flock); | |
1175 | if (!rc) | |
1176 | return rc; | |
1177 | ||
106dc538 | 1178 | if (type & server->vals->shared_lock_type) |
03776f45 PS |
1179 | posix_lock_type = CIFS_RDLCK; |
1180 | else | |
1181 | posix_lock_type = CIFS_WRLCK; | |
4f6bcec9 | 1182 | rc = CIFSSMBPosixLock(xid, tcon, netfid, current->tgid, |
c5fd363d | 1183 | flock->fl_start, length, flock, |
4f6bcec9 | 1184 | posix_lock_type, wait_flag); |
03776f45 PS |
1185 | return rc; |
1186 | } | |
1da177e4 | 1187 | |
fbd35aca | 1188 | rc = cifs_lock_test(cfile, flock->fl_start, length, type, flock); |
85160e03 PS |
1189 | if (!rc) |
1190 | return rc; | |
1191 | ||
03776f45 | 1192 | /* BB we could chain these into one lock request BB */ |
55157dfb PS |
1193 | rc = cifs_mandatory_lock(xid, cfile, flock->fl_start, length, type, |
1194 | 1, 0, false); | |
03776f45 | 1195 | if (rc == 0) { |
55157dfb PS |
1196 | rc = cifs_mandatory_lock(xid, cfile, flock->fl_start, length, |
1197 | type, 0, 1, false); | |
03776f45 PS |
1198 | flock->fl_type = F_UNLCK; |
1199 | if (rc != 0) | |
1200 | cERROR(1, "Error unlocking previously locked " | |
106dc538 | 1201 | "range %d during test of lock", rc); |
a88b4707 | 1202 | return 0; |
1da177e4 | 1203 | } |
7ee1af76 | 1204 | |
106dc538 | 1205 | if (type & server->vals->shared_lock_type) { |
03776f45 | 1206 | flock->fl_type = F_WRLCK; |
a88b4707 | 1207 | return 0; |
7ee1af76 JA |
1208 | } |
1209 | ||
55157dfb PS |
1210 | rc = cifs_mandatory_lock(xid, cfile, flock->fl_start, length, |
1211 | type | server->vals->shared_lock_type, 1, 0, | |
1212 | false); | |
03776f45 | 1213 | if (rc == 0) { |
55157dfb PS |
1214 | rc = cifs_mandatory_lock(xid, cfile, flock->fl_start, length, |
1215 | type | server->vals->shared_lock_type, | |
1216 | 0, 1, false); | |
03776f45 PS |
1217 | flock->fl_type = F_RDLCK; |
1218 | if (rc != 0) | |
1219 | cERROR(1, "Error unlocking previously locked " | |
1220 | "range %d during test of lock", rc); | |
1221 | } else | |
1222 | flock->fl_type = F_WRLCK; | |
1223 | ||
a88b4707 | 1224 | return 0; |
03776f45 PS |
1225 | } |
1226 | ||
9ee305b7 PS |
1227 | static void |
1228 | cifs_move_llist(struct list_head *source, struct list_head *dest) | |
1229 | { | |
1230 | struct list_head *li, *tmp; | |
1231 | list_for_each_safe(li, tmp, source) | |
1232 | list_move(li, dest); | |
1233 | } | |
1234 | ||
1235 | static void | |
1236 | cifs_free_llist(struct list_head *llist) | |
1237 | { | |
1238 | struct cifsLockInfo *li, *tmp; | |
1239 | list_for_each_entry_safe(li, tmp, llist, llist) { | |
1240 | cifs_del_lock_waiters(li); | |
1241 | list_del(&li->llist); | |
1242 | kfree(li); | |
1243 | } | |
1244 | } | |
1245 | ||
1246 | static int | |
6d5786a3 PS |
1247 | cifs_unlock_range(struct cifsFileInfo *cfile, struct file_lock *flock, |
1248 | unsigned int xid) | |
9ee305b7 PS |
1249 | { |
1250 | int rc = 0, stored_rc; | |
1251 | int types[] = {LOCKING_ANDX_LARGE_FILES, | |
1252 | LOCKING_ANDX_SHARED_LOCK | LOCKING_ANDX_LARGE_FILES}; | |
1253 | unsigned int i; | |
0013fb4c | 1254 | unsigned int max_num, num, max_buf; |
9ee305b7 PS |
1255 | LOCKING_ANDX_RANGE *buf, *cur; |
1256 | struct cifs_tcon *tcon = tlink_tcon(cfile->tlink); | |
1257 | struct cifsInodeInfo *cinode = CIFS_I(cfile->dentry->d_inode); | |
1258 | struct cifsLockInfo *li, *tmp; | |
1259 | __u64 length = 1 + flock->fl_end - flock->fl_start; | |
1260 | struct list_head tmp_llist; | |
1261 | ||
1262 | INIT_LIST_HEAD(&tmp_llist); | |
1263 | ||
0013fb4c PS |
1264 | /* |
1265 | * Accessing maxBuf is racy with cifs_reconnect - need to store value | |
1266 | * and check it for zero before using. | |
1267 | */ | |
1268 | max_buf = tcon->ses->server->maxBuf; | |
1269 | if (!max_buf) | |
1270 | return -EINVAL; | |
1271 | ||
1272 | max_num = (max_buf - sizeof(struct smb_hdr)) / | |
1273 | sizeof(LOCKING_ANDX_RANGE); | |
9ee305b7 PS |
1274 | buf = kzalloc(max_num * sizeof(LOCKING_ANDX_RANGE), GFP_KERNEL); |
1275 | if (!buf) | |
1276 | return -ENOMEM; | |
1277 | ||
1278 | mutex_lock(&cinode->lock_mutex); | |
1279 | for (i = 0; i < 2; i++) { | |
1280 | cur = buf; | |
1281 | num = 0; | |
fbd35aca | 1282 | list_for_each_entry_safe(li, tmp, &cfile->llist, llist) { |
9ee305b7 PS |
1283 | if (flock->fl_start > li->offset || |
1284 | (flock->fl_start + length) < | |
1285 | (li->offset + li->length)) | |
1286 | continue; | |
1287 | if (current->tgid != li->pid) | |
1288 | continue; | |
9ee305b7 PS |
1289 | if (types[i] != li->type) |
1290 | continue; | |
ea319d57 | 1291 | if (cinode->can_cache_brlcks) { |
9ee305b7 PS |
1292 | /* |
1293 | * We can cache brlock requests - simply remove | |
fbd35aca | 1294 | * a lock from the file's list. |
9ee305b7 PS |
1295 | */ |
1296 | list_del(&li->llist); | |
1297 | cifs_del_lock_waiters(li); | |
1298 | kfree(li); | |
ea319d57 | 1299 | continue; |
9ee305b7 | 1300 | } |
ea319d57 PS |
1301 | cur->Pid = cpu_to_le16(li->pid); |
1302 | cur->LengthLow = cpu_to_le32((u32)li->length); | |
1303 | cur->LengthHigh = cpu_to_le32((u32)(li->length>>32)); | |
1304 | cur->OffsetLow = cpu_to_le32((u32)li->offset); | |
1305 | cur->OffsetHigh = cpu_to_le32((u32)(li->offset>>32)); | |
1306 | /* | |
1307 | * We need to save a lock here to let us add it again to | |
1308 | * the file's list if the unlock range request fails on | |
1309 | * the server. | |
1310 | */ | |
1311 | list_move(&li->llist, &tmp_llist); | |
1312 | if (++num == max_num) { | |
4b4de76e PS |
1313 | stored_rc = cifs_lockv(xid, tcon, |
1314 | cfile->fid.netfid, | |
ea319d57 PS |
1315 | li->type, num, 0, buf); |
1316 | if (stored_rc) { | |
1317 | /* | |
1318 | * We failed on the unlock range | |
1319 | * request - add all locks from the tmp | |
1320 | * list to the head of the file's list. | |
1321 | */ | |
1322 | cifs_move_llist(&tmp_llist, | |
1323 | &cfile->llist); | |
1324 | rc = stored_rc; | |
1325 | } else | |
1326 | /* | |
1327 | * The unlock range request succeed - | |
1328 | * free the tmp list. | |
1329 | */ | |
1330 | cifs_free_llist(&tmp_llist); | |
1331 | cur = buf; | |
1332 | num = 0; | |
1333 | } else | |
1334 | cur++; | |
9ee305b7 PS |
1335 | } |
1336 | if (num) { | |
4b4de76e | 1337 | stored_rc = cifs_lockv(xid, tcon, cfile->fid.netfid, |
9ee305b7 PS |
1338 | types[i], num, 0, buf); |
1339 | if (stored_rc) { | |
fbd35aca | 1340 | cifs_move_llist(&tmp_llist, &cfile->llist); |
9ee305b7 PS |
1341 | rc = stored_rc; |
1342 | } else | |
1343 | cifs_free_llist(&tmp_llist); | |
1344 | } | |
1345 | } | |
1346 | ||
1347 | mutex_unlock(&cinode->lock_mutex); | |
1348 | kfree(buf); | |
1349 | return rc; | |
1350 | } | |
1351 | ||
03776f45 | 1352 | static int |
04a6aa8a | 1353 | cifs_setlk(struct file *file, struct file_lock *flock, __u32 type, |
6d5786a3 PS |
1354 | bool wait_flag, bool posix_lck, int lock, int unlock, |
1355 | unsigned int xid) | |
03776f45 PS |
1356 | { |
1357 | int rc = 0; | |
1358 | __u64 length = 1 + flock->fl_end - flock->fl_start; | |
1359 | struct cifsFileInfo *cfile = (struct cifsFileInfo *)file->private_data; | |
1360 | struct cifs_tcon *tcon = tlink_tcon(cfile->tlink); | |
106dc538 | 1361 | struct TCP_Server_Info *server = tcon->ses->server; |
4b4de76e | 1362 | __u16 netfid = cfile->fid.netfid; |
03776f45 PS |
1363 | |
1364 | if (posix_lck) { | |
08547b03 | 1365 | int posix_lock_type; |
4f6bcec9 PS |
1366 | |
1367 | rc = cifs_posix_lock_set(file, flock); | |
1368 | if (!rc || rc < 0) | |
1369 | return rc; | |
1370 | ||
106dc538 | 1371 | if (type & server->vals->shared_lock_type) |
08547b03 SF |
1372 | posix_lock_type = CIFS_RDLCK; |
1373 | else | |
1374 | posix_lock_type = CIFS_WRLCK; | |
50c2f753 | 1375 | |
03776f45 | 1376 | if (unlock == 1) |
beb84dc8 | 1377 | posix_lock_type = CIFS_UNLCK; |
7ee1af76 | 1378 | |
4f6bcec9 | 1379 | rc = CIFSSMBPosixLock(xid, tcon, netfid, current->tgid, |
c5fd363d | 1380 | flock->fl_start, length, NULL, |
4f6bcec9 | 1381 | posix_lock_type, wait_flag); |
03776f45 PS |
1382 | goto out; |
1383 | } | |
7ee1af76 | 1384 | |
03776f45 | 1385 | if (lock) { |
161ebf9f PS |
1386 | struct cifsLockInfo *lock; |
1387 | ||
fbd35aca | 1388 | lock = cifs_lock_init(flock->fl_start, length, type); |
161ebf9f PS |
1389 | if (!lock) |
1390 | return -ENOMEM; | |
1391 | ||
fbd35aca | 1392 | rc = cifs_lock_add_if(cfile, lock, wait_flag); |
85160e03 | 1393 | if (rc < 0) |
161ebf9f PS |
1394 | kfree(lock); |
1395 | if (rc <= 0) | |
85160e03 PS |
1396 | goto out; |
1397 | ||
7f92447a PS |
1398 | rc = cifs_mandatory_lock(xid, cfile, flock->fl_start, length, |
1399 | type, 1, 0, wait_flag); | |
161ebf9f PS |
1400 | if (rc) { |
1401 | kfree(lock); | |
1402 | goto out; | |
03776f45 | 1403 | } |
161ebf9f | 1404 | |
fbd35aca | 1405 | cifs_lock_add(cfile, lock); |
9ee305b7 PS |
1406 | } else if (unlock) |
1407 | rc = cifs_unlock_range(cfile, flock, xid); | |
03776f45 | 1408 | |
03776f45 PS |
1409 | out: |
1410 | if (flock->fl_flags & FL_POSIX) | |
9ebb389d | 1411 | posix_lock_file_wait(file, flock); |
03776f45 PS |
1412 | return rc; |
1413 | } | |
1414 | ||
1415 | int cifs_lock(struct file *file, int cmd, struct file_lock *flock) | |
1416 | { | |
1417 | int rc, xid; | |
1418 | int lock = 0, unlock = 0; | |
1419 | bool wait_flag = false; | |
1420 | bool posix_lck = false; | |
1421 | struct cifs_sb_info *cifs_sb; | |
1422 | struct cifs_tcon *tcon; | |
1423 | struct cifsInodeInfo *cinode; | |
1424 | struct cifsFileInfo *cfile; | |
1425 | __u16 netfid; | |
04a6aa8a | 1426 | __u32 type; |
03776f45 PS |
1427 | |
1428 | rc = -EACCES; | |
6d5786a3 | 1429 | xid = get_xid(); |
03776f45 PS |
1430 | |
1431 | cFYI(1, "Lock parm: 0x%x flockflags: 0x%x flocktype: 0x%x start: %lld " | |
1432 | "end: %lld", cmd, flock->fl_flags, flock->fl_type, | |
1433 | flock->fl_start, flock->fl_end); | |
1434 | ||
03776f45 PS |
1435 | cfile = (struct cifsFileInfo *)file->private_data; |
1436 | tcon = tlink_tcon(cfile->tlink); | |
106dc538 PS |
1437 | |
1438 | cifs_read_flock(flock, &type, &lock, &unlock, &wait_flag, | |
1439 | tcon->ses->server); | |
1440 | ||
1441 | cifs_sb = CIFS_SB(file->f_path.dentry->d_sb); | |
4b4de76e | 1442 | netfid = cfile->fid.netfid; |
03776f45 PS |
1443 | cinode = CIFS_I(file->f_path.dentry->d_inode); |
1444 | ||
29e20f9c | 1445 | if (cap_unix(tcon->ses) && |
03776f45 PS |
1446 | (CIFS_UNIX_FCNTL_CAP & le64_to_cpu(tcon->fsUnixInfo.Capability)) && |
1447 | ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NOPOSIXBRL) == 0)) | |
1448 | posix_lck = true; | |
1449 | /* | |
1450 | * BB add code here to normalize offset and length to account for | |
1451 | * negative length which we can not accept over the wire. | |
1452 | */ | |
1453 | if (IS_GETLK(cmd)) { | |
4f6bcec9 | 1454 | rc = cifs_getlk(file, flock, type, wait_flag, posix_lck, xid); |
6d5786a3 | 1455 | free_xid(xid); |
03776f45 PS |
1456 | return rc; |
1457 | } | |
1458 | ||
1459 | if (!lock && !unlock) { | |
1460 | /* | |
1461 | * if no lock or unlock then nothing to do since we do not | |
1462 | * know what it is | |
1463 | */ | |
6d5786a3 | 1464 | free_xid(xid); |
03776f45 | 1465 | return -EOPNOTSUPP; |
7ee1af76 JA |
1466 | } |
1467 | ||
03776f45 PS |
1468 | rc = cifs_setlk(file, flock, type, wait_flag, posix_lck, lock, unlock, |
1469 | xid); | |
6d5786a3 | 1470 | free_xid(xid); |
1da177e4 LT |
1471 | return rc; |
1472 | } | |
1473 | ||
597b027f JL |
1474 | /* |
1475 | * update the file size (if needed) after a write. Should be called with | |
1476 | * the inode->i_lock held | |
1477 | */ | |
72432ffc | 1478 | void |
fbec9ab9 JL |
1479 | cifs_update_eof(struct cifsInodeInfo *cifsi, loff_t offset, |
1480 | unsigned int bytes_written) | |
1481 | { | |
1482 | loff_t end_of_write = offset + bytes_written; | |
1483 | ||
1484 | if (end_of_write > cifsi->server_eof) | |
1485 | cifsi->server_eof = end_of_write; | |
1486 | } | |
1487 | ||
ba9ad725 PS |
1488 | static ssize_t |
1489 | cifs_write(struct cifsFileInfo *open_file, __u32 pid, const char *write_data, | |
1490 | size_t write_size, loff_t *offset) | |
1da177e4 LT |
1491 | { |
1492 | int rc = 0; | |
1493 | unsigned int bytes_written = 0; | |
1494 | unsigned int total_written; | |
1495 | struct cifs_sb_info *cifs_sb; | |
ba9ad725 PS |
1496 | struct cifs_tcon *tcon; |
1497 | struct TCP_Server_Info *server; | |
6d5786a3 | 1498 | unsigned int xid; |
7da4b49a JL |
1499 | struct dentry *dentry = open_file->dentry; |
1500 | struct cifsInodeInfo *cifsi = CIFS_I(dentry->d_inode); | |
fa2989f4 | 1501 | struct cifs_io_parms io_parms; |
1da177e4 | 1502 | |
7da4b49a | 1503 | cifs_sb = CIFS_SB(dentry->d_sb); |
1da177e4 | 1504 | |
b6b38f70 | 1505 | cFYI(1, "write %zd bytes to offset %lld of %s", write_size, |
ba9ad725 | 1506 | *offset, dentry->d_name.name); |
1da177e4 | 1507 | |
ba9ad725 PS |
1508 | tcon = tlink_tcon(open_file->tlink); |
1509 | server = tcon->ses->server; | |
1510 | ||
1511 | if (!server->ops->sync_write) | |
1512 | return -ENOSYS; | |
50c2f753 | 1513 | |
6d5786a3 | 1514 | xid = get_xid(); |
1da177e4 | 1515 | |
1da177e4 LT |
1516 | for (total_written = 0; write_size > total_written; |
1517 | total_written += bytes_written) { | |
1518 | rc = -EAGAIN; | |
1519 | while (rc == -EAGAIN) { | |
ca83ce3d JL |
1520 | struct kvec iov[2]; |
1521 | unsigned int len; | |
1522 | ||
1da177e4 | 1523 | if (open_file->invalidHandle) { |
1da177e4 LT |
1524 | /* we could deadlock if we called |
1525 | filemap_fdatawait from here so tell | |
fb8c4b14 | 1526 | reopen_file not to flush data to |
1da177e4 | 1527 | server now */ |
15886177 | 1528 | rc = cifs_reopen_file(open_file, false); |
1da177e4 LT |
1529 | if (rc != 0) |
1530 | break; | |
1531 | } | |
ca83ce3d JL |
1532 | |
1533 | len = min((size_t)cifs_sb->wsize, | |
1534 | write_size - total_written); | |
1535 | /* iov[0] is reserved for smb header */ | |
1536 | iov[1].iov_base = (char *)write_data + total_written; | |
1537 | iov[1].iov_len = len; | |
fa2989f4 | 1538 | io_parms.pid = pid; |
ba9ad725 PS |
1539 | io_parms.tcon = tcon; |
1540 | io_parms.offset = *offset; | |
fa2989f4 | 1541 | io_parms.length = len; |
ba9ad725 PS |
1542 | rc = server->ops->sync_write(xid, open_file, &io_parms, |
1543 | &bytes_written, iov, 1); | |
1da177e4 LT |
1544 | } |
1545 | if (rc || (bytes_written == 0)) { | |
1546 | if (total_written) | |
1547 | break; | |
1548 | else { | |
6d5786a3 | 1549 | free_xid(xid); |
1da177e4 LT |
1550 | return rc; |
1551 | } | |
fbec9ab9 | 1552 | } else { |
597b027f | 1553 | spin_lock(&dentry->d_inode->i_lock); |
ba9ad725 | 1554 | cifs_update_eof(cifsi, *offset, bytes_written); |
597b027f | 1555 | spin_unlock(&dentry->d_inode->i_lock); |
ba9ad725 | 1556 | *offset += bytes_written; |
fbec9ab9 | 1557 | } |
1da177e4 LT |
1558 | } |
1559 | ||
ba9ad725 | 1560 | cifs_stats_bytes_written(tcon, total_written); |
1da177e4 | 1561 | |
7da4b49a JL |
1562 | if (total_written > 0) { |
1563 | spin_lock(&dentry->d_inode->i_lock); | |
ba9ad725 PS |
1564 | if (*offset > dentry->d_inode->i_size) |
1565 | i_size_write(dentry->d_inode, *offset); | |
7da4b49a | 1566 | spin_unlock(&dentry->d_inode->i_lock); |
1da177e4 | 1567 | } |
7da4b49a | 1568 | mark_inode_dirty_sync(dentry->d_inode); |
6d5786a3 | 1569 | free_xid(xid); |
1da177e4 LT |
1570 | return total_written; |
1571 | } | |
1572 | ||
6508d904 JL |
1573 | struct cifsFileInfo *find_readable_file(struct cifsInodeInfo *cifs_inode, |
1574 | bool fsuid_only) | |
630f3f0c SF |
1575 | { |
1576 | struct cifsFileInfo *open_file = NULL; | |
6508d904 JL |
1577 | struct cifs_sb_info *cifs_sb = CIFS_SB(cifs_inode->vfs_inode.i_sb); |
1578 | ||
1579 | /* only filter by fsuid on multiuser mounts */ | |
1580 | if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MULTIUSER)) | |
1581 | fsuid_only = false; | |
630f3f0c | 1582 | |
4477288a | 1583 | spin_lock(&cifs_file_list_lock); |
630f3f0c SF |
1584 | /* we could simply get the first_list_entry since write-only entries |
1585 | are always at the end of the list but since the first entry might | |
1586 | have a close pending, we go through the whole list */ | |
1587 | list_for_each_entry(open_file, &cifs_inode->openFileList, flist) { | |
6508d904 JL |
1588 | if (fsuid_only && open_file->uid != current_fsuid()) |
1589 | continue; | |
2e396b83 | 1590 | if (OPEN_FMODE(open_file->f_flags) & FMODE_READ) { |
630f3f0c SF |
1591 | if (!open_file->invalidHandle) { |
1592 | /* found a good file */ | |
1593 | /* lock it so it will not be closed on us */ | |
764a1b1a | 1594 | cifsFileInfo_get_locked(open_file); |
4477288a | 1595 | spin_unlock(&cifs_file_list_lock); |
630f3f0c SF |
1596 | return open_file; |
1597 | } /* else might as well continue, and look for | |
1598 | another, or simply have the caller reopen it | |
1599 | again rather than trying to fix this handle */ | |
1600 | } else /* write only file */ | |
1601 | break; /* write only files are last so must be done */ | |
1602 | } | |
4477288a | 1603 | spin_unlock(&cifs_file_list_lock); |
630f3f0c SF |
1604 | return NULL; |
1605 | } | |
630f3f0c | 1606 | |
6508d904 JL |
1607 | struct cifsFileInfo *find_writable_file(struct cifsInodeInfo *cifs_inode, |
1608 | bool fsuid_only) | |
6148a742 | 1609 | { |
2c0c2a08 | 1610 | struct cifsFileInfo *open_file, *inv_file = NULL; |
d3892294 | 1611 | struct cifs_sb_info *cifs_sb; |
2846d386 | 1612 | bool any_available = false; |
dd99cd80 | 1613 | int rc; |
2c0c2a08 | 1614 | unsigned int refind = 0; |
6148a742 | 1615 | |
60808233 SF |
1616 | /* Having a null inode here (because mapping->host was set to zero by |
1617 | the VFS or MM) should not happen but we had reports of on oops (due to | |
1618 | it being zero) during stress testcases so we need to check for it */ | |
1619 | ||
fb8c4b14 | 1620 | if (cifs_inode == NULL) { |
b6b38f70 | 1621 | cERROR(1, "Null inode passed to cifs_writeable_file"); |
60808233 SF |
1622 | dump_stack(); |
1623 | return NULL; | |
1624 | } | |
1625 | ||
d3892294 JL |
1626 | cifs_sb = CIFS_SB(cifs_inode->vfs_inode.i_sb); |
1627 | ||
6508d904 JL |
1628 | /* only filter by fsuid on multiuser mounts */ |
1629 | if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MULTIUSER)) | |
1630 | fsuid_only = false; | |
1631 | ||
4477288a | 1632 | spin_lock(&cifs_file_list_lock); |
9b22b0b7 | 1633 | refind_writable: |
2c0c2a08 SP |
1634 | if (refind > MAX_REOPEN_ATT) { |
1635 | spin_unlock(&cifs_file_list_lock); | |
1636 | return NULL; | |
1637 | } | |
6148a742 | 1638 | list_for_each_entry(open_file, &cifs_inode->openFileList, flist) { |
6508d904 JL |
1639 | if (!any_available && open_file->pid != current->tgid) |
1640 | continue; | |
1641 | if (fsuid_only && open_file->uid != current_fsuid()) | |
6148a742 | 1642 | continue; |
2e396b83 | 1643 | if (OPEN_FMODE(open_file->f_flags) & FMODE_WRITE) { |
9b22b0b7 SF |
1644 | if (!open_file->invalidHandle) { |
1645 | /* found a good writable file */ | |
764a1b1a | 1646 | cifsFileInfo_get_locked(open_file); |
4477288a | 1647 | spin_unlock(&cifs_file_list_lock); |
9b22b0b7 | 1648 | return open_file; |
2c0c2a08 SP |
1649 | } else { |
1650 | if (!inv_file) | |
1651 | inv_file = open_file; | |
9b22b0b7 | 1652 | } |
6148a742 SF |
1653 | } |
1654 | } | |
2846d386 JL |
1655 | /* couldn't find useable FH with same pid, try any available */ |
1656 | if (!any_available) { | |
1657 | any_available = true; | |
1658 | goto refind_writable; | |
1659 | } | |
2c0c2a08 SP |
1660 | |
1661 | if (inv_file) { | |
1662 | any_available = false; | |
764a1b1a | 1663 | cifsFileInfo_get_locked(inv_file); |
2c0c2a08 SP |
1664 | } |
1665 | ||
4477288a | 1666 | spin_unlock(&cifs_file_list_lock); |
2c0c2a08 SP |
1667 | |
1668 | if (inv_file) { | |
1669 | rc = cifs_reopen_file(inv_file, false); | |
1670 | if (!rc) | |
1671 | return inv_file; | |
1672 | else { | |
1673 | spin_lock(&cifs_file_list_lock); | |
1674 | list_move_tail(&inv_file->flist, | |
1675 | &cifs_inode->openFileList); | |
1676 | spin_unlock(&cifs_file_list_lock); | |
1677 | cifsFileInfo_put(inv_file); | |
1678 | spin_lock(&cifs_file_list_lock); | |
1679 | ++refind; | |
1680 | goto refind_writable; | |
1681 | } | |
1682 | } | |
1683 | ||
6148a742 SF |
1684 | return NULL; |
1685 | } | |
1686 | ||
1da177e4 LT |
1687 | static int cifs_partialpagewrite(struct page *page, unsigned from, unsigned to) |
1688 | { | |
1689 | struct address_space *mapping = page->mapping; | |
1690 | loff_t offset = (loff_t)page->index << PAGE_CACHE_SHIFT; | |
1691 | char *write_data; | |
1692 | int rc = -EFAULT; | |
1693 | int bytes_written = 0; | |
1da177e4 | 1694 | struct inode *inode; |
6148a742 | 1695 | struct cifsFileInfo *open_file; |
1da177e4 LT |
1696 | |
1697 | if (!mapping || !mapping->host) | |
1698 | return -EFAULT; | |
1699 | ||
1700 | inode = page->mapping->host; | |
1da177e4 LT |
1701 | |
1702 | offset += (loff_t)from; | |
1703 | write_data = kmap(page); | |
1704 | write_data += from; | |
1705 | ||
1706 | if ((to > PAGE_CACHE_SIZE) || (from > to)) { | |
1707 | kunmap(page); | |
1708 | return -EIO; | |
1709 | } | |
1710 | ||
1711 | /* racing with truncate? */ | |
1712 | if (offset > mapping->host->i_size) { | |
1713 | kunmap(page); | |
1714 | return 0; /* don't care */ | |
1715 | } | |
1716 | ||
1717 | /* check to make sure that we are not extending the file */ | |
1718 | if (mapping->host->i_size - offset < (loff_t)to) | |
fb8c4b14 | 1719 | to = (unsigned)(mapping->host->i_size - offset); |
1da177e4 | 1720 | |
6508d904 | 1721 | open_file = find_writable_file(CIFS_I(mapping->host), false); |
6148a742 | 1722 | if (open_file) { |
fa2989f4 PS |
1723 | bytes_written = cifs_write(open_file, open_file->pid, |
1724 | write_data, to - from, &offset); | |
6ab409b5 | 1725 | cifsFileInfo_put(open_file); |
1da177e4 | 1726 | /* Does mm or vfs already set times? */ |
6148a742 | 1727 | inode->i_atime = inode->i_mtime = current_fs_time(inode->i_sb); |
bb5a9a04 | 1728 | if ((bytes_written > 0) && (offset)) |
6148a742 | 1729 | rc = 0; |
bb5a9a04 SF |
1730 | else if (bytes_written < 0) |
1731 | rc = bytes_written; | |
6148a742 | 1732 | } else { |
b6b38f70 | 1733 | cFYI(1, "No writeable filehandles for inode"); |
1da177e4 LT |
1734 | rc = -EIO; |
1735 | } | |
1736 | ||
1737 | kunmap(page); | |
1738 | return rc; | |
1739 | } | |
1740 | ||
e9492871 JL |
1741 | /* |
1742 | * Marshal up the iov array, reserving the first one for the header. Also, | |
1743 | * set wdata->bytes. | |
1744 | */ | |
1745 | static void | |
1746 | cifs_writepages_marshal_iov(struct kvec *iov, struct cifs_writedata *wdata) | |
1747 | { | |
1748 | int i; | |
1749 | struct inode *inode = wdata->cfile->dentry->d_inode; | |
1750 | loff_t size = i_size_read(inode); | |
1751 | ||
1752 | /* marshal up the pages into iov array */ | |
1753 | wdata->bytes = 0; | |
1754 | for (i = 0; i < wdata->nr_pages; i++) { | |
1755 | iov[i + 1].iov_len = min(size - page_offset(wdata->pages[i]), | |
1756 | (loff_t)PAGE_CACHE_SIZE); | |
1757 | iov[i + 1].iov_base = kmap(wdata->pages[i]); | |
1758 | wdata->bytes += iov[i + 1].iov_len; | |
1759 | } | |
1760 | } | |
1761 | ||
1da177e4 | 1762 | static int cifs_writepages(struct address_space *mapping, |
37c0eb46 | 1763 | struct writeback_control *wbc) |
1da177e4 | 1764 | { |
c3d17b63 JL |
1765 | struct cifs_sb_info *cifs_sb = CIFS_SB(mapping->host->i_sb); |
1766 | bool done = false, scanned = false, range_whole = false; | |
1767 | pgoff_t end, index; | |
1768 | struct cifs_writedata *wdata; | |
c9de5c80 | 1769 | struct TCP_Server_Info *server; |
37c0eb46 | 1770 | struct page *page; |
37c0eb46 | 1771 | int rc = 0; |
50c2f753 | 1772 | |
37c0eb46 | 1773 | /* |
c3d17b63 | 1774 | * If wsize is smaller than the page cache size, default to writing |
37c0eb46 SF |
1775 | * one page at a time via cifs_writepage |
1776 | */ | |
1777 | if (cifs_sb->wsize < PAGE_CACHE_SIZE) | |
1778 | return generic_writepages(mapping, wbc); | |
1779 | ||
111ebb6e | 1780 | if (wbc->range_cyclic) { |
37c0eb46 | 1781 | index = mapping->writeback_index; /* Start from prev offset */ |
111ebb6e OH |
1782 | end = -1; |
1783 | } else { | |
1784 | index = wbc->range_start >> PAGE_CACHE_SHIFT; | |
1785 | end = wbc->range_end >> PAGE_CACHE_SHIFT; | |
1786 | if (wbc->range_start == 0 && wbc->range_end == LLONG_MAX) | |
c3d17b63 JL |
1787 | range_whole = true; |
1788 | scanned = true; | |
37c0eb46 SF |
1789 | } |
1790 | retry: | |
c3d17b63 JL |
1791 | while (!done && index <= end) { |
1792 | unsigned int i, nr_pages, found_pages; | |
1793 | pgoff_t next = 0, tofind; | |
1794 | struct page **pages; | |
1795 | ||
1796 | tofind = min((cifs_sb->wsize / PAGE_CACHE_SIZE) - 1, | |
1797 | end - index) + 1; | |
1798 | ||
c2e87640 JL |
1799 | wdata = cifs_writedata_alloc((unsigned int)tofind, |
1800 | cifs_writev_complete); | |
c3d17b63 JL |
1801 | if (!wdata) { |
1802 | rc = -ENOMEM; | |
1803 | break; | |
1804 | } | |
1805 | ||
1806 | /* | |
1807 | * find_get_pages_tag seems to return a max of 256 on each | |
1808 | * iteration, so we must call it several times in order to | |
1809 | * fill the array or the wsize is effectively limited to | |
1810 | * 256 * PAGE_CACHE_SIZE. | |
1811 | */ | |
1812 | found_pages = 0; | |
1813 | pages = wdata->pages; | |
1814 | do { | |
1815 | nr_pages = find_get_pages_tag(mapping, &index, | |
1816 | PAGECACHE_TAG_DIRTY, | |
1817 | tofind, pages); | |
1818 | found_pages += nr_pages; | |
1819 | tofind -= nr_pages; | |
1820 | pages += nr_pages; | |
1821 | } while (nr_pages && tofind && index <= end); | |
1822 | ||
1823 | if (found_pages == 0) { | |
1824 | kref_put(&wdata->refcount, cifs_writedata_release); | |
1825 | break; | |
1826 | } | |
1827 | ||
1828 | nr_pages = 0; | |
1829 | for (i = 0; i < found_pages; i++) { | |
1830 | page = wdata->pages[i]; | |
37c0eb46 SF |
1831 | /* |
1832 | * At this point we hold neither mapping->tree_lock nor | |
1833 | * lock on the page itself: the page may be truncated or | |
1834 | * invalidated (changing page->mapping to NULL), or even | |
1835 | * swizzled back from swapper_space to tmpfs file | |
1836 | * mapping | |
1837 | */ | |
1838 | ||
c3d17b63 | 1839 | if (nr_pages == 0) |
37c0eb46 | 1840 | lock_page(page); |
529ae9aa | 1841 | else if (!trylock_page(page)) |
37c0eb46 SF |
1842 | break; |
1843 | ||
1844 | if (unlikely(page->mapping != mapping)) { | |
1845 | unlock_page(page); | |
1846 | break; | |
1847 | } | |
1848 | ||
111ebb6e | 1849 | if (!wbc->range_cyclic && page->index > end) { |
c3d17b63 | 1850 | done = true; |
37c0eb46 SF |
1851 | unlock_page(page); |
1852 | break; | |
1853 | } | |
1854 | ||
1855 | if (next && (page->index != next)) { | |
1856 | /* Not next consecutive page */ | |
1857 | unlock_page(page); | |
1858 | break; | |
1859 | } | |
1860 | ||
1861 | if (wbc->sync_mode != WB_SYNC_NONE) | |
1862 | wait_on_page_writeback(page); | |
1863 | ||
1864 | if (PageWriteback(page) || | |
cb876f45 | 1865 | !clear_page_dirty_for_io(page)) { |
37c0eb46 SF |
1866 | unlock_page(page); |
1867 | break; | |
1868 | } | |
84d2f07e | 1869 | |
cb876f45 LT |
1870 | /* |
1871 | * This actually clears the dirty bit in the radix tree. | |
1872 | * See cifs_writepage() for more commentary. | |
1873 | */ | |
1874 | set_page_writeback(page); | |
1875 | ||
84d2f07e | 1876 | if (page_offset(page) >= mapping->host->i_size) { |
c3d17b63 | 1877 | done = true; |
84d2f07e | 1878 | unlock_page(page); |
cb876f45 | 1879 | end_page_writeback(page); |
84d2f07e SF |
1880 | break; |
1881 | } | |
1882 | ||
c3d17b63 JL |
1883 | wdata->pages[i] = page; |
1884 | next = page->index + 1; | |
1885 | ++nr_pages; | |
1886 | } | |
37c0eb46 | 1887 | |
c3d17b63 JL |
1888 | /* reset index to refind any pages skipped */ |
1889 | if (nr_pages == 0) | |
1890 | index = wdata->pages[0]->index + 1; | |
84d2f07e | 1891 | |
c3d17b63 JL |
1892 | /* put any pages we aren't going to use */ |
1893 | for (i = nr_pages; i < found_pages; i++) { | |
1894 | page_cache_release(wdata->pages[i]); | |
1895 | wdata->pages[i] = NULL; | |
1896 | } | |
37c0eb46 | 1897 | |
c3d17b63 JL |
1898 | /* nothing to write? */ |
1899 | if (nr_pages == 0) { | |
1900 | kref_put(&wdata->refcount, cifs_writedata_release); | |
1901 | continue; | |
37c0eb46 | 1902 | } |
fbec9ab9 | 1903 | |
c3d17b63 JL |
1904 | wdata->sync_mode = wbc->sync_mode; |
1905 | wdata->nr_pages = nr_pages; | |
1906 | wdata->offset = page_offset(wdata->pages[0]); | |
e9492871 | 1907 | wdata->marshal_iov = cifs_writepages_marshal_iov; |
941b853d | 1908 | |
c3d17b63 JL |
1909 | do { |
1910 | if (wdata->cfile != NULL) | |
1911 | cifsFileInfo_put(wdata->cfile); | |
1912 | wdata->cfile = find_writable_file(CIFS_I(mapping->host), | |
1913 | false); | |
1914 | if (!wdata->cfile) { | |
1915 | cERROR(1, "No writable handles for inode"); | |
1916 | rc = -EBADF; | |
1917 | break; | |
941b853d | 1918 | } |
fe5f5d2e | 1919 | wdata->pid = wdata->cfile->pid; |
c9de5c80 PS |
1920 | server = tlink_tcon(wdata->cfile->tlink)->ses->server; |
1921 | rc = server->ops->async_writev(wdata); | |
c3d17b63 | 1922 | } while (wbc->sync_mode == WB_SYNC_ALL && rc == -EAGAIN); |
941b853d | 1923 | |
c3d17b63 JL |
1924 | for (i = 0; i < nr_pages; ++i) |
1925 | unlock_page(wdata->pages[i]); | |
f3983c21 | 1926 | |
c3d17b63 JL |
1927 | /* send failure -- clean up the mess */ |
1928 | if (rc != 0) { | |
1929 | for (i = 0; i < nr_pages; ++i) { | |
941b853d | 1930 | if (rc == -EAGAIN) |
c3d17b63 JL |
1931 | redirty_page_for_writepage(wbc, |
1932 | wdata->pages[i]); | |
1933 | else | |
1934 | SetPageError(wdata->pages[i]); | |
1935 | end_page_writeback(wdata->pages[i]); | |
1936 | page_cache_release(wdata->pages[i]); | |
37c0eb46 | 1937 | } |
941b853d JL |
1938 | if (rc != -EAGAIN) |
1939 | mapping_set_error(mapping, rc); | |
c3d17b63 JL |
1940 | } |
1941 | kref_put(&wdata->refcount, cifs_writedata_release); | |
941b853d | 1942 | |
c3d17b63 JL |
1943 | wbc->nr_to_write -= nr_pages; |
1944 | if (wbc->nr_to_write <= 0) | |
1945 | done = true; | |
b066a48c | 1946 | |
c3d17b63 | 1947 | index = next; |
37c0eb46 | 1948 | } |
c3d17b63 | 1949 | |
37c0eb46 SF |
1950 | if (!scanned && !done) { |
1951 | /* | |
1952 | * We hit the last page and there is more work to be done: wrap | |
1953 | * back to the start of the file | |
1954 | */ | |
c3d17b63 | 1955 | scanned = true; |
37c0eb46 SF |
1956 | index = 0; |
1957 | goto retry; | |
1958 | } | |
c3d17b63 | 1959 | |
111ebb6e | 1960 | if (wbc->range_cyclic || (range_whole && wbc->nr_to_write > 0)) |
37c0eb46 SF |
1961 | mapping->writeback_index = index; |
1962 | ||
1da177e4 LT |
1963 | return rc; |
1964 | } | |
1da177e4 | 1965 | |
9ad1506b PS |
1966 | static int |
1967 | cifs_writepage_locked(struct page *page, struct writeback_control *wbc) | |
1da177e4 | 1968 | { |
9ad1506b | 1969 | int rc; |
6d5786a3 | 1970 | unsigned int xid; |
1da177e4 | 1971 | |
6d5786a3 | 1972 | xid = get_xid(); |
1da177e4 LT |
1973 | /* BB add check for wbc flags */ |
1974 | page_cache_get(page); | |
ad7a2926 | 1975 | if (!PageUptodate(page)) |
b6b38f70 | 1976 | cFYI(1, "ppw - page not up to date"); |
cb876f45 LT |
1977 | |
1978 | /* | |
1979 | * Set the "writeback" flag, and clear "dirty" in the radix tree. | |
1980 | * | |
1981 | * A writepage() implementation always needs to do either this, | |
1982 | * or re-dirty the page with "redirty_page_for_writepage()" in | |
1983 | * the case of a failure. | |
1984 | * | |
1985 | * Just unlocking the page will cause the radix tree tag-bits | |
1986 | * to fail to update with the state of the page correctly. | |
1987 | */ | |
fb8c4b14 | 1988 | set_page_writeback(page); |
9ad1506b | 1989 | retry_write: |
1da177e4 | 1990 | rc = cifs_partialpagewrite(page, 0, PAGE_CACHE_SIZE); |
9ad1506b PS |
1991 | if (rc == -EAGAIN && wbc->sync_mode == WB_SYNC_ALL) |
1992 | goto retry_write; | |
1993 | else if (rc == -EAGAIN) | |
1994 | redirty_page_for_writepage(wbc, page); | |
1995 | else if (rc != 0) | |
1996 | SetPageError(page); | |
1997 | else | |
1998 | SetPageUptodate(page); | |
cb876f45 LT |
1999 | end_page_writeback(page); |
2000 | page_cache_release(page); | |
6d5786a3 | 2001 | free_xid(xid); |
1da177e4 LT |
2002 | return rc; |
2003 | } | |
2004 | ||
9ad1506b PS |
2005 | static int cifs_writepage(struct page *page, struct writeback_control *wbc) |
2006 | { | |
2007 | int rc = cifs_writepage_locked(page, wbc); | |
2008 | unlock_page(page); | |
2009 | return rc; | |
2010 | } | |
2011 | ||
d9414774 NP |
2012 | static int cifs_write_end(struct file *file, struct address_space *mapping, |
2013 | loff_t pos, unsigned len, unsigned copied, | |
2014 | struct page *page, void *fsdata) | |
1da177e4 | 2015 | { |
d9414774 NP |
2016 | int rc; |
2017 | struct inode *inode = mapping->host; | |
d4ffff1f PS |
2018 | struct cifsFileInfo *cfile = file->private_data; |
2019 | struct cifs_sb_info *cifs_sb = CIFS_SB(cfile->dentry->d_sb); | |
2020 | __u32 pid; | |
2021 | ||
2022 | if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_RWPIDFORWARD) | |
2023 | pid = cfile->pid; | |
2024 | else | |
2025 | pid = current->tgid; | |
1da177e4 | 2026 | |
b6b38f70 JP |
2027 | cFYI(1, "write_end for page %p from pos %lld with %d bytes", |
2028 | page, pos, copied); | |
d9414774 | 2029 | |
a98ee8c1 JL |
2030 | if (PageChecked(page)) { |
2031 | if (copied == len) | |
2032 | SetPageUptodate(page); | |
2033 | ClearPageChecked(page); | |
2034 | } else if (!PageUptodate(page) && copied == PAGE_CACHE_SIZE) | |
d9414774 | 2035 | SetPageUptodate(page); |
ad7a2926 | 2036 | |
1da177e4 | 2037 | if (!PageUptodate(page)) { |
d9414774 NP |
2038 | char *page_data; |
2039 | unsigned offset = pos & (PAGE_CACHE_SIZE - 1); | |
6d5786a3 | 2040 | unsigned int xid; |
d9414774 | 2041 | |
6d5786a3 | 2042 | xid = get_xid(); |
1da177e4 LT |
2043 | /* this is probably better than directly calling |
2044 | partialpage_write since in this function the file handle is | |
2045 | known which we might as well leverage */ | |
2046 | /* BB check if anything else missing out of ppw | |
2047 | such as updating last write time */ | |
2048 | page_data = kmap(page); | |
d4ffff1f | 2049 | rc = cifs_write(cfile, pid, page_data + offset, copied, &pos); |
d9414774 | 2050 | /* if (rc < 0) should we set writebehind rc? */ |
1da177e4 | 2051 | kunmap(page); |
d9414774 | 2052 | |
6d5786a3 | 2053 | free_xid(xid); |
fb8c4b14 | 2054 | } else { |
d9414774 NP |
2055 | rc = copied; |
2056 | pos += copied; | |
1da177e4 LT |
2057 | set_page_dirty(page); |
2058 | } | |
2059 | ||
d9414774 NP |
2060 | if (rc > 0) { |
2061 | spin_lock(&inode->i_lock); | |
2062 | if (pos > inode->i_size) | |
2063 | i_size_write(inode, pos); | |
2064 | spin_unlock(&inode->i_lock); | |
2065 | } | |
2066 | ||
2067 | unlock_page(page); | |
2068 | page_cache_release(page); | |
2069 | ||
1da177e4 LT |
2070 | return rc; |
2071 | } | |
2072 | ||
02c24a82 JB |
2073 | int cifs_strict_fsync(struct file *file, loff_t start, loff_t end, |
2074 | int datasync) | |
1da177e4 | 2075 | { |
6d5786a3 | 2076 | unsigned int xid; |
1da177e4 | 2077 | int rc = 0; |
96daf2b0 | 2078 | struct cifs_tcon *tcon; |
1d8c4c00 | 2079 | struct TCP_Server_Info *server; |
c21dfb69 | 2080 | struct cifsFileInfo *smbfile = file->private_data; |
e6a00296 | 2081 | struct inode *inode = file->f_path.dentry->d_inode; |
8be7e6ba | 2082 | struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb); |
1da177e4 | 2083 | |
02c24a82 JB |
2084 | rc = filemap_write_and_wait_range(inode->i_mapping, start, end); |
2085 | if (rc) | |
2086 | return rc; | |
2087 | mutex_lock(&inode->i_mutex); | |
2088 | ||
6d5786a3 | 2089 | xid = get_xid(); |
1da177e4 | 2090 | |
b6b38f70 | 2091 | cFYI(1, "Sync file - name: %s datasync: 0x%x", |
7ea80859 | 2092 | file->f_path.dentry->d_name.name, datasync); |
50c2f753 | 2093 | |
6feb9891 PS |
2094 | if (!CIFS_I(inode)->clientCanCacheRead) { |
2095 | rc = cifs_invalidate_mapping(inode); | |
2096 | if (rc) { | |
2097 | cFYI(1, "rc: %d during invalidate phase", rc); | |
2098 | rc = 0; /* don't care about it in fsync */ | |
2099 | } | |
2100 | } | |
eb4b756b | 2101 | |
8be7e6ba | 2102 | tcon = tlink_tcon(smbfile->tlink); |
1d8c4c00 PS |
2103 | if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NOSSYNC)) { |
2104 | server = tcon->ses->server; | |
2105 | if (server->ops->flush) | |
2106 | rc = server->ops->flush(xid, tcon, &smbfile->fid); | |
2107 | else | |
2108 | rc = -ENOSYS; | |
2109 | } | |
8be7e6ba | 2110 | |
6d5786a3 | 2111 | free_xid(xid); |
02c24a82 | 2112 | mutex_unlock(&inode->i_mutex); |
8be7e6ba PS |
2113 | return rc; |
2114 | } | |
2115 | ||
02c24a82 | 2116 | int cifs_fsync(struct file *file, loff_t start, loff_t end, int datasync) |
8be7e6ba | 2117 | { |
6d5786a3 | 2118 | unsigned int xid; |
8be7e6ba | 2119 | int rc = 0; |
96daf2b0 | 2120 | struct cifs_tcon *tcon; |
1d8c4c00 | 2121 | struct TCP_Server_Info *server; |
8be7e6ba PS |
2122 | struct cifsFileInfo *smbfile = file->private_data; |
2123 | struct cifs_sb_info *cifs_sb = CIFS_SB(file->f_path.dentry->d_sb); | |
02c24a82 JB |
2124 | struct inode *inode = file->f_mapping->host; |
2125 | ||
2126 | rc = filemap_write_and_wait_range(inode->i_mapping, start, end); | |
2127 | if (rc) | |
2128 | return rc; | |
2129 | mutex_lock(&inode->i_mutex); | |
8be7e6ba | 2130 | |
6d5786a3 | 2131 | xid = get_xid(); |
8be7e6ba PS |
2132 | |
2133 | cFYI(1, "Sync file - name: %s datasync: 0x%x", | |
2134 | file->f_path.dentry->d_name.name, datasync); | |
2135 | ||
2136 | tcon = tlink_tcon(smbfile->tlink); | |
1d8c4c00 PS |
2137 | if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NOSSYNC)) { |
2138 | server = tcon->ses->server; | |
2139 | if (server->ops->flush) | |
2140 | rc = server->ops->flush(xid, tcon, &smbfile->fid); | |
2141 | else | |
2142 | rc = -ENOSYS; | |
2143 | } | |
b298f223 | 2144 | |
6d5786a3 | 2145 | free_xid(xid); |
02c24a82 | 2146 | mutex_unlock(&inode->i_mutex); |
1da177e4 LT |
2147 | return rc; |
2148 | } | |
2149 | ||
1da177e4 LT |
2150 | /* |
2151 | * As file closes, flush all cached write data for this inode checking | |
2152 | * for write behind errors. | |
2153 | */ | |
75e1fcc0 | 2154 | int cifs_flush(struct file *file, fl_owner_t id) |
1da177e4 | 2155 | { |
fb8c4b14 | 2156 | struct inode *inode = file->f_path.dentry->d_inode; |
1da177e4 LT |
2157 | int rc = 0; |
2158 | ||
eb4b756b | 2159 | if (file->f_mode & FMODE_WRITE) |
d3f1322a | 2160 | rc = filemap_write_and_wait(inode->i_mapping); |
50c2f753 | 2161 | |
b6b38f70 | 2162 | cFYI(1, "Flush inode %p file %p rc %d", inode, file, rc); |
1da177e4 LT |
2163 | |
2164 | return rc; | |
2165 | } | |
2166 | ||
72432ffc PS |
2167 | static int |
2168 | cifs_write_allocate_pages(struct page **pages, unsigned long num_pages) | |
2169 | { | |
2170 | int rc = 0; | |
2171 | unsigned long i; | |
2172 | ||
2173 | for (i = 0; i < num_pages; i++) { | |
e94f7ba1 | 2174 | pages[i] = alloc_page(GFP_KERNEL|__GFP_HIGHMEM); |
72432ffc PS |
2175 | if (!pages[i]) { |
2176 | /* | |
2177 | * save number of pages we have already allocated and | |
2178 | * return with ENOMEM error | |
2179 | */ | |
2180 | num_pages = i; | |
2181 | rc = -ENOMEM; | |
e94f7ba1 | 2182 | break; |
72432ffc PS |
2183 | } |
2184 | } | |
2185 | ||
e94f7ba1 JL |
2186 | if (rc) { |
2187 | for (i = 0; i < num_pages; i++) | |
2188 | put_page(pages[i]); | |
2189 | } | |
72432ffc PS |
2190 | return rc; |
2191 | } | |
2192 | ||
2193 | static inline | |
2194 | size_t get_numpages(const size_t wsize, const size_t len, size_t *cur_len) | |
2195 | { | |
2196 | size_t num_pages; | |
2197 | size_t clen; | |
2198 | ||
2199 | clen = min_t(const size_t, len, wsize); | |
a7103b99 | 2200 | num_pages = DIV_ROUND_UP(clen, PAGE_SIZE); |
72432ffc PS |
2201 | |
2202 | if (cur_len) | |
2203 | *cur_len = clen; | |
2204 | ||
2205 | return num_pages; | |
2206 | } | |
2207 | ||
da82f7e7 JL |
2208 | static void |
2209 | cifs_uncached_marshal_iov(struct kvec *iov, struct cifs_writedata *wdata) | |
2210 | { | |
2211 | int i; | |
2212 | size_t bytes = wdata->bytes; | |
2213 | ||
2214 | /* marshal up the pages into iov array */ | |
2215 | for (i = 0; i < wdata->nr_pages; i++) { | |
c7ad42b5 | 2216 | iov[i + 1].iov_len = min_t(size_t, bytes, PAGE_SIZE); |
da82f7e7 JL |
2217 | iov[i + 1].iov_base = kmap(wdata->pages[i]); |
2218 | bytes -= iov[i + 1].iov_len; | |
2219 | } | |
2220 | } | |
2221 | ||
2222 | static void | |
2223 | cifs_uncached_writev_complete(struct work_struct *work) | |
2224 | { | |
2225 | int i; | |
2226 | struct cifs_writedata *wdata = container_of(work, | |
2227 | struct cifs_writedata, work); | |
2228 | struct inode *inode = wdata->cfile->dentry->d_inode; | |
2229 | struct cifsInodeInfo *cifsi = CIFS_I(inode); | |
2230 | ||
2231 | spin_lock(&inode->i_lock); | |
2232 | cifs_update_eof(cifsi, wdata->offset, wdata->bytes); | |
2233 | if (cifsi->server_eof > inode->i_size) | |
2234 | i_size_write(inode, cifsi->server_eof); | |
2235 | spin_unlock(&inode->i_lock); | |
2236 | ||
2237 | complete(&wdata->done); | |
2238 | ||
2239 | if (wdata->result != -EAGAIN) { | |
2240 | for (i = 0; i < wdata->nr_pages; i++) | |
2241 | put_page(wdata->pages[i]); | |
2242 | } | |
2243 | ||
2244 | kref_put(&wdata->refcount, cifs_writedata_release); | |
2245 | } | |
2246 | ||
2247 | /* attempt to send write to server, retry on any -EAGAIN errors */ | |
2248 | static int | |
2249 | cifs_uncached_retry_writev(struct cifs_writedata *wdata) | |
2250 | { | |
2251 | int rc; | |
c9de5c80 PS |
2252 | struct TCP_Server_Info *server; |
2253 | ||
2254 | server = tlink_tcon(wdata->cfile->tlink)->ses->server; | |
da82f7e7 JL |
2255 | |
2256 | do { | |
2257 | if (wdata->cfile->invalidHandle) { | |
2258 | rc = cifs_reopen_file(wdata->cfile, false); | |
2259 | if (rc != 0) | |
2260 | continue; | |
2261 | } | |
c9de5c80 | 2262 | rc = server->ops->async_writev(wdata); |
da82f7e7 JL |
2263 | } while (rc == -EAGAIN); |
2264 | ||
2265 | return rc; | |
2266 | } | |
2267 | ||
72432ffc PS |
2268 | static ssize_t |
2269 | cifs_iovec_write(struct file *file, const struct iovec *iov, | |
2270 | unsigned long nr_segs, loff_t *poffset) | |
2271 | { | |
da82f7e7 | 2272 | unsigned long nr_pages, i; |
76429c14 PS |
2273 | size_t copied, len, cur_len; |
2274 | ssize_t total_written = 0; | |
3af9d8f2 | 2275 | loff_t offset; |
72432ffc | 2276 | struct iov_iter it; |
72432ffc | 2277 | struct cifsFileInfo *open_file; |
da82f7e7 | 2278 | struct cifs_tcon *tcon; |
72432ffc | 2279 | struct cifs_sb_info *cifs_sb; |
da82f7e7 JL |
2280 | struct cifs_writedata *wdata, *tmp; |
2281 | struct list_head wdata_list; | |
2282 | int rc; | |
2283 | pid_t pid; | |
72432ffc PS |
2284 | |
2285 | len = iov_length(iov, nr_segs); | |
2286 | if (!len) | |
2287 | return 0; | |
2288 | ||
2289 | rc = generic_write_checks(file, poffset, &len, 0); | |
2290 | if (rc) | |
2291 | return rc; | |
2292 | ||
da82f7e7 | 2293 | INIT_LIST_HEAD(&wdata_list); |
72432ffc | 2294 | cifs_sb = CIFS_SB(file->f_path.dentry->d_sb); |
72432ffc | 2295 | open_file = file->private_data; |
da82f7e7 | 2296 | tcon = tlink_tcon(open_file->tlink); |
c9de5c80 PS |
2297 | |
2298 | if (!tcon->ses->server->ops->async_writev) | |
2299 | return -ENOSYS; | |
2300 | ||
3af9d8f2 | 2301 | offset = *poffset; |
d4ffff1f PS |
2302 | |
2303 | if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_RWPIDFORWARD) | |
2304 | pid = open_file->pid; | |
2305 | else | |
2306 | pid = current->tgid; | |
2307 | ||
72432ffc | 2308 | iov_iter_init(&it, iov, nr_segs, len, 0); |
72432ffc | 2309 | do { |
da82f7e7 JL |
2310 | size_t save_len; |
2311 | ||
2312 | nr_pages = get_numpages(cifs_sb->wsize, len, &cur_len); | |
2313 | wdata = cifs_writedata_alloc(nr_pages, | |
2314 | cifs_uncached_writev_complete); | |
2315 | if (!wdata) { | |
2316 | rc = -ENOMEM; | |
2317 | break; | |
2318 | } | |
2319 | ||
2320 | rc = cifs_write_allocate_pages(wdata->pages, nr_pages); | |
2321 | if (rc) { | |
2322 | kfree(wdata); | |
2323 | break; | |
2324 | } | |
2325 | ||
2326 | save_len = cur_len; | |
2327 | for (i = 0; i < nr_pages; i++) { | |
2328 | copied = min_t(const size_t, cur_len, PAGE_SIZE); | |
2329 | copied = iov_iter_copy_from_user(wdata->pages[i], &it, | |
2330 | 0, copied); | |
72432ffc PS |
2331 | cur_len -= copied; |
2332 | iov_iter_advance(&it, copied); | |
72432ffc | 2333 | } |
72432ffc PS |
2334 | cur_len = save_len - cur_len; |
2335 | ||
da82f7e7 JL |
2336 | wdata->sync_mode = WB_SYNC_ALL; |
2337 | wdata->nr_pages = nr_pages; | |
2338 | wdata->offset = (__u64)offset; | |
2339 | wdata->cfile = cifsFileInfo_get(open_file); | |
2340 | wdata->pid = pid; | |
2341 | wdata->bytes = cur_len; | |
2342 | wdata->marshal_iov = cifs_uncached_marshal_iov; | |
2343 | rc = cifs_uncached_retry_writev(wdata); | |
2344 | if (rc) { | |
2345 | kref_put(&wdata->refcount, cifs_writedata_release); | |
72432ffc PS |
2346 | break; |
2347 | } | |
2348 | ||
da82f7e7 JL |
2349 | list_add_tail(&wdata->list, &wdata_list); |
2350 | offset += cur_len; | |
2351 | len -= cur_len; | |
72432ffc PS |
2352 | } while (len > 0); |
2353 | ||
da82f7e7 JL |
2354 | /* |
2355 | * If at least one write was successfully sent, then discard any rc | |
2356 | * value from the later writes. If the other write succeeds, then | |
2357 | * we'll end up returning whatever was written. If it fails, then | |
2358 | * we'll get a new rc value from that. | |
2359 | */ | |
2360 | if (!list_empty(&wdata_list)) | |
2361 | rc = 0; | |
2362 | ||
2363 | /* | |
2364 | * Wait for and collect replies for any successful sends in order of | |
2365 | * increasing offset. Once an error is hit or we get a fatal signal | |
2366 | * while waiting, then return without waiting for any more replies. | |
2367 | */ | |
2368 | restart_loop: | |
2369 | list_for_each_entry_safe(wdata, tmp, &wdata_list, list) { | |
2370 | if (!rc) { | |
2371 | /* FIXME: freezable too? */ | |
2372 | rc = wait_for_completion_killable(&wdata->done); | |
2373 | if (rc) | |
2374 | rc = -EINTR; | |
2375 | else if (wdata->result) | |
2376 | rc = wdata->result; | |
2377 | else | |
2378 | total_written += wdata->bytes; | |
2379 | ||
2380 | /* resend call if it's a retryable error */ | |
2381 | if (rc == -EAGAIN) { | |
2382 | rc = cifs_uncached_retry_writev(wdata); | |
2383 | goto restart_loop; | |
2384 | } | |
2385 | } | |
2386 | list_del_init(&wdata->list); | |
2387 | kref_put(&wdata->refcount, cifs_writedata_release); | |
72432ffc PS |
2388 | } |
2389 | ||
da82f7e7 JL |
2390 | if (total_written > 0) |
2391 | *poffset += total_written; | |
72432ffc | 2392 | |
da82f7e7 JL |
2393 | cifs_stats_bytes_written(tcon, total_written); |
2394 | return total_written ? total_written : (ssize_t)rc; | |
72432ffc PS |
2395 | } |
2396 | ||
0b81c1c4 | 2397 | ssize_t cifs_user_writev(struct kiocb *iocb, const struct iovec *iov, |
72432ffc PS |
2398 | unsigned long nr_segs, loff_t pos) |
2399 | { | |
2400 | ssize_t written; | |
2401 | struct inode *inode; | |
2402 | ||
2403 | inode = iocb->ki_filp->f_path.dentry->d_inode; | |
2404 | ||
2405 | /* | |
2406 | * BB - optimize the way when signing is disabled. We can drop this | |
2407 | * extra memory-to-memory copying and use iovec buffers for constructing | |
2408 | * write request. | |
2409 | */ | |
2410 | ||
2411 | written = cifs_iovec_write(iocb->ki_filp, iov, nr_segs, &pos); | |
2412 | if (written > 0) { | |
2413 | CIFS_I(inode)->invalid_mapping = true; | |
2414 | iocb->ki_pos = pos; | |
2415 | } | |
2416 | ||
2417 | return written; | |
2418 | } | |
2419 | ||
2420 | ssize_t cifs_strict_writev(struct kiocb *iocb, const struct iovec *iov, | |
2421 | unsigned long nr_segs, loff_t pos) | |
2422 | { | |
2423 | struct inode *inode; | |
2424 | ||
2425 | inode = iocb->ki_filp->f_path.dentry->d_inode; | |
2426 | ||
2427 | if (CIFS_I(inode)->clientCanCacheAll) | |
2428 | return generic_file_aio_write(iocb, iov, nr_segs, pos); | |
2429 | ||
2430 | /* | |
2431 | * In strict cache mode we need to write the data to the server exactly | |
2432 | * from the pos to pos+len-1 rather than flush all affected pages | |
2433 | * because it may cause a error with mandatory locks on these pages but | |
2434 | * not on the region from pos to ppos+len-1. | |
2435 | */ | |
2436 | ||
2437 | return cifs_user_writev(iocb, iov, nr_segs, pos); | |
2438 | } | |
2439 | ||
0471ca3f JL |
2440 | static struct cifs_readdata * |
2441 | cifs_readdata_alloc(unsigned int nr_vecs, work_func_t complete) | |
2442 | { | |
2443 | struct cifs_readdata *rdata; | |
2444 | ||
2445 | rdata = kzalloc(sizeof(*rdata) + | |
2446 | sizeof(struct kvec) * nr_vecs, GFP_KERNEL); | |
2447 | if (rdata != NULL) { | |
6993f74a | 2448 | kref_init(&rdata->refcount); |
1c892549 JL |
2449 | INIT_LIST_HEAD(&rdata->list); |
2450 | init_completion(&rdata->done); | |
0471ca3f JL |
2451 | INIT_WORK(&rdata->work, complete); |
2452 | INIT_LIST_HEAD(&rdata->pages); | |
2453 | } | |
2454 | return rdata; | |
2455 | } | |
2456 | ||
6993f74a JL |
2457 | void |
2458 | cifs_readdata_release(struct kref *refcount) | |
0471ca3f | 2459 | { |
6993f74a JL |
2460 | struct cifs_readdata *rdata = container_of(refcount, |
2461 | struct cifs_readdata, refcount); | |
2462 | ||
2463 | if (rdata->cfile) | |
2464 | cifsFileInfo_put(rdata->cfile); | |
2465 | ||
0471ca3f JL |
2466 | kfree(rdata); |
2467 | } | |
2468 | ||
1c892549 JL |
2469 | static int |
2470 | cifs_read_allocate_pages(struct list_head *list, unsigned int npages) | |
2471 | { | |
2472 | int rc = 0; | |
2473 | struct page *page, *tpage; | |
2474 | unsigned int i; | |
2475 | ||
2476 | for (i = 0; i < npages; i++) { | |
2477 | page = alloc_page(GFP_KERNEL|__GFP_HIGHMEM); | |
2478 | if (!page) { | |
2479 | rc = -ENOMEM; | |
2480 | break; | |
2481 | } | |
2482 | list_add(&page->lru, list); | |
2483 | } | |
2484 | ||
2485 | if (rc) { | |
2486 | list_for_each_entry_safe(page, tpage, list, lru) { | |
2487 | list_del(&page->lru); | |
2488 | put_page(page); | |
2489 | } | |
2490 | } | |
2491 | return rc; | |
2492 | } | |
2493 | ||
2494 | static void | |
2495 | cifs_uncached_readdata_release(struct kref *refcount) | |
2496 | { | |
2497 | struct page *page, *tpage; | |
2498 | struct cifs_readdata *rdata = container_of(refcount, | |
2499 | struct cifs_readdata, refcount); | |
2500 | ||
2501 | list_for_each_entry_safe(page, tpage, &rdata->pages, lru) { | |
2502 | list_del(&page->lru); | |
2503 | put_page(page); | |
2504 | } | |
2505 | cifs_readdata_release(refcount); | |
2506 | } | |
2507 | ||
2a1bb138 JL |
2508 | static int |
2509 | cifs_retry_async_readv(struct cifs_readdata *rdata) | |
2510 | { | |
2511 | int rc; | |
fc9c5966 PS |
2512 | struct TCP_Server_Info *server; |
2513 | ||
2514 | server = tlink_tcon(rdata->cfile->tlink)->ses->server; | |
2a1bb138 JL |
2515 | |
2516 | do { | |
2517 | if (rdata->cfile->invalidHandle) { | |
2518 | rc = cifs_reopen_file(rdata->cfile, true); | |
2519 | if (rc != 0) | |
2520 | continue; | |
2521 | } | |
fc9c5966 | 2522 | rc = server->ops->async_readv(rdata); |
2a1bb138 JL |
2523 | } while (rc == -EAGAIN); |
2524 | ||
2525 | return rc; | |
2526 | } | |
2527 | ||
1c892549 JL |
2528 | /** |
2529 | * cifs_readdata_to_iov - copy data from pages in response to an iovec | |
2530 | * @rdata: the readdata response with list of pages holding data | |
2531 | * @iov: vector in which we should copy the data | |
2532 | * @nr_segs: number of segments in vector | |
2533 | * @offset: offset into file of the first iovec | |
2534 | * @copied: used to return the amount of data copied to the iov | |
2535 | * | |
2536 | * This function copies data from a list of pages in a readdata response into | |
2537 | * an array of iovecs. It will first calculate where the data should go | |
2538 | * based on the info in the readdata and then copy the data into that spot. | |
2539 | */ | |
2540 | static ssize_t | |
2541 | cifs_readdata_to_iov(struct cifs_readdata *rdata, const struct iovec *iov, | |
2542 | unsigned long nr_segs, loff_t offset, ssize_t *copied) | |
2543 | { | |
2544 | int rc = 0; | |
2545 | struct iov_iter ii; | |
2546 | size_t pos = rdata->offset - offset; | |
2547 | struct page *page, *tpage; | |
2548 | ssize_t remaining = rdata->bytes; | |
2549 | unsigned char *pdata; | |
2550 | ||
2551 | /* set up iov_iter and advance to the correct offset */ | |
2552 | iov_iter_init(&ii, iov, nr_segs, iov_length(iov, nr_segs), 0); | |
2553 | iov_iter_advance(&ii, pos); | |
2554 | ||
2555 | *copied = 0; | |
2556 | list_for_each_entry_safe(page, tpage, &rdata->pages, lru) { | |
2557 | ssize_t copy; | |
2558 | ||
2559 | /* copy a whole page or whatever's left */ | |
2560 | copy = min_t(ssize_t, remaining, PAGE_SIZE); | |
2561 | ||
2562 | /* ...but limit it to whatever space is left in the iov */ | |
2563 | copy = min_t(ssize_t, copy, iov_iter_count(&ii)); | |
2564 | ||
2565 | /* go while there's data to be copied and no errors */ | |
2566 | if (copy && !rc) { | |
2567 | pdata = kmap(page); | |
2568 | rc = memcpy_toiovecend(ii.iov, pdata, ii.iov_offset, | |
2569 | (int)copy); | |
2570 | kunmap(page); | |
2571 | if (!rc) { | |
2572 | *copied += copy; | |
2573 | remaining -= copy; | |
2574 | iov_iter_advance(&ii, copy); | |
2575 | } | |
2576 | } | |
2577 | ||
2578 | list_del(&page->lru); | |
2579 | put_page(page); | |
2580 | } | |
2581 | ||
2582 | return rc; | |
2583 | } | |
2584 | ||
2585 | static void | |
2586 | cifs_uncached_readv_complete(struct work_struct *work) | |
2587 | { | |
2588 | struct cifs_readdata *rdata = container_of(work, | |
2589 | struct cifs_readdata, work); | |
2590 | ||
2591 | /* if the result is non-zero then the pages weren't kmapped */ | |
2592 | if (rdata->result == 0) { | |
2593 | struct page *page; | |
2594 | ||
2595 | list_for_each_entry(page, &rdata->pages, lru) | |
2596 | kunmap(page); | |
2597 | } | |
2598 | ||
2599 | complete(&rdata->done); | |
2600 | kref_put(&rdata->refcount, cifs_uncached_readdata_release); | |
2601 | } | |
2602 | ||
2603 | static int | |
2604 | cifs_uncached_read_marshal_iov(struct cifs_readdata *rdata, | |
2605 | unsigned int remaining) | |
2606 | { | |
2607 | int len = 0; | |
2608 | struct page *page, *tpage; | |
2609 | ||
2610 | rdata->nr_iov = 1; | |
2611 | list_for_each_entry_safe(page, tpage, &rdata->pages, lru) { | |
2612 | if (remaining >= PAGE_SIZE) { | |
2613 | /* enough data to fill the page */ | |
2614 | rdata->iov[rdata->nr_iov].iov_base = kmap(page); | |
2615 | rdata->iov[rdata->nr_iov].iov_len = PAGE_SIZE; | |
2616 | cFYI(1, "%u: idx=%lu iov_base=%p iov_len=%zu", | |
2617 | rdata->nr_iov, page->index, | |
2618 | rdata->iov[rdata->nr_iov].iov_base, | |
2619 | rdata->iov[rdata->nr_iov].iov_len); | |
2620 | ++rdata->nr_iov; | |
2621 | len += PAGE_SIZE; | |
2622 | remaining -= PAGE_SIZE; | |
2623 | } else if (remaining > 0) { | |
2624 | /* enough for partial page, fill and zero the rest */ | |
2625 | rdata->iov[rdata->nr_iov].iov_base = kmap(page); | |
2626 | rdata->iov[rdata->nr_iov].iov_len = remaining; | |
2627 | cFYI(1, "%u: idx=%lu iov_base=%p iov_len=%zu", | |
2628 | rdata->nr_iov, page->index, | |
2629 | rdata->iov[rdata->nr_iov].iov_base, | |
2630 | rdata->iov[rdata->nr_iov].iov_len); | |
2631 | memset(rdata->iov[rdata->nr_iov].iov_base + remaining, | |
2632 | '\0', PAGE_SIZE - remaining); | |
2633 | ++rdata->nr_iov; | |
2634 | len += remaining; | |
2635 | remaining = 0; | |
2636 | } else { | |
2637 | /* no need to hold page hostage */ | |
2638 | list_del(&page->lru); | |
2639 | put_page(page); | |
2640 | } | |
2641 | } | |
2642 | ||
2643 | return len; | |
2644 | } | |
2645 | ||
a70307ee PS |
2646 | static ssize_t |
2647 | cifs_iovec_read(struct file *file, const struct iovec *iov, | |
2648 | unsigned long nr_segs, loff_t *poffset) | |
1da177e4 | 2649 | { |
1c892549 | 2650 | ssize_t rc; |
a70307ee | 2651 | size_t len, cur_len; |
1c892549 JL |
2652 | ssize_t total_read = 0; |
2653 | loff_t offset = *poffset; | |
2654 | unsigned int npages; | |
1da177e4 | 2655 | struct cifs_sb_info *cifs_sb; |
1c892549 | 2656 | struct cifs_tcon *tcon; |
1da177e4 | 2657 | struct cifsFileInfo *open_file; |
1c892549 JL |
2658 | struct cifs_readdata *rdata, *tmp; |
2659 | struct list_head rdata_list; | |
2660 | pid_t pid; | |
a70307ee PS |
2661 | |
2662 | if (!nr_segs) | |
2663 | return 0; | |
2664 | ||
2665 | len = iov_length(iov, nr_segs); | |
2666 | if (!len) | |
2667 | return 0; | |
1da177e4 | 2668 | |
1c892549 | 2669 | INIT_LIST_HEAD(&rdata_list); |
e6a00296 | 2670 | cifs_sb = CIFS_SB(file->f_path.dentry->d_sb); |
c21dfb69 | 2671 | open_file = file->private_data; |
1c892549 | 2672 | tcon = tlink_tcon(open_file->tlink); |
1da177e4 | 2673 | |
fc9c5966 PS |
2674 | if (!tcon->ses->server->ops->async_readv) |
2675 | return -ENOSYS; | |
2676 | ||
d4ffff1f PS |
2677 | if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_RWPIDFORWARD) |
2678 | pid = open_file->pid; | |
2679 | else | |
2680 | pid = current->tgid; | |
2681 | ||
ad7a2926 | 2682 | if ((file->f_flags & O_ACCMODE) == O_WRONLY) |
b6b38f70 | 2683 | cFYI(1, "attempting read on write only file instance"); |
ad7a2926 | 2684 | |
1c892549 JL |
2685 | do { |
2686 | cur_len = min_t(const size_t, len - total_read, cifs_sb->rsize); | |
2687 | npages = DIV_ROUND_UP(cur_len, PAGE_SIZE); | |
a70307ee | 2688 | |
1c892549 JL |
2689 | /* allocate a readdata struct */ |
2690 | rdata = cifs_readdata_alloc(npages, | |
2691 | cifs_uncached_readv_complete); | |
2692 | if (!rdata) { | |
2693 | rc = -ENOMEM; | |
2694 | goto error; | |
1da177e4 | 2695 | } |
a70307ee | 2696 | |
1c892549 JL |
2697 | rc = cifs_read_allocate_pages(&rdata->pages, npages); |
2698 | if (rc) | |
2699 | goto error; | |
2700 | ||
2701 | rdata->cfile = cifsFileInfo_get(open_file); | |
2702 | rdata->offset = offset; | |
2703 | rdata->bytes = cur_len; | |
2704 | rdata->pid = pid; | |
2705 | rdata->marshal_iov = cifs_uncached_read_marshal_iov; | |
2706 | ||
2707 | rc = cifs_retry_async_readv(rdata); | |
2708 | error: | |
2709 | if (rc) { | |
2710 | kref_put(&rdata->refcount, | |
2711 | cifs_uncached_readdata_release); | |
2712 | break; | |
2713 | } | |
2714 | ||
2715 | list_add_tail(&rdata->list, &rdata_list); | |
2716 | offset += cur_len; | |
2717 | len -= cur_len; | |
2718 | } while (len > 0); | |
2719 | ||
2720 | /* if at least one read request send succeeded, then reset rc */ | |
2721 | if (!list_empty(&rdata_list)) | |
2722 | rc = 0; | |
2723 | ||
2724 | /* the loop below should proceed in the order of increasing offsets */ | |
2725 | restart_loop: | |
2726 | list_for_each_entry_safe(rdata, tmp, &rdata_list, list) { | |
2727 | if (!rc) { | |
2728 | ssize_t copied; | |
2729 | ||
2730 | /* FIXME: freezable sleep too? */ | |
2731 | rc = wait_for_completion_killable(&rdata->done); | |
2732 | if (rc) | |
2733 | rc = -EINTR; | |
2734 | else if (rdata->result) | |
2735 | rc = rdata->result; | |
2736 | else { | |
2737 | rc = cifs_readdata_to_iov(rdata, iov, | |
2738 | nr_segs, *poffset, | |
2739 | &copied); | |
2740 | total_read += copied; | |
2741 | } | |
2742 | ||
2743 | /* resend call if it's a retryable error */ | |
2744 | if (rc == -EAGAIN) { | |
2745 | rc = cifs_retry_async_readv(rdata); | |
2746 | goto restart_loop; | |
1da177e4 | 2747 | } |
1da177e4 | 2748 | } |
1c892549 JL |
2749 | list_del_init(&rdata->list); |
2750 | kref_put(&rdata->refcount, cifs_uncached_readdata_release); | |
1da177e4 | 2751 | } |
a70307ee | 2752 | |
1c892549 JL |
2753 | cifs_stats_bytes_read(tcon, total_read); |
2754 | *poffset += total_read; | |
2755 | ||
09a4707e PS |
2756 | /* mask nodata case */ |
2757 | if (rc == -ENODATA) | |
2758 | rc = 0; | |
2759 | ||
1c892549 | 2760 | return total_read ? total_read : rc; |
1da177e4 LT |
2761 | } |
2762 | ||
0b81c1c4 | 2763 | ssize_t cifs_user_readv(struct kiocb *iocb, const struct iovec *iov, |
a70307ee PS |
2764 | unsigned long nr_segs, loff_t pos) |
2765 | { | |
2766 | ssize_t read; | |
2767 | ||
2768 | read = cifs_iovec_read(iocb->ki_filp, iov, nr_segs, &pos); | |
2769 | if (read > 0) | |
2770 | iocb->ki_pos = pos; | |
2771 | ||
2772 | return read; | |
2773 | } | |
2774 | ||
2775 | ssize_t cifs_strict_readv(struct kiocb *iocb, const struct iovec *iov, | |
2776 | unsigned long nr_segs, loff_t pos) | |
2777 | { | |
2778 | struct inode *inode; | |
2779 | ||
2780 | inode = iocb->ki_filp->f_path.dentry->d_inode; | |
2781 | ||
2782 | if (CIFS_I(inode)->clientCanCacheRead) | |
2783 | return generic_file_aio_read(iocb, iov, nr_segs, pos); | |
2784 | ||
2785 | /* | |
2786 | * In strict cache mode we need to read from the server all the time | |
2787 | * if we don't have level II oplock because the server can delay mtime | |
2788 | * change - so we can't make a decision about inode invalidating. | |
2789 | * And we can also fail with pagereading if there are mandatory locks | |
2790 | * on pages affected by this read but not on the region from pos to | |
2791 | * pos+len-1. | |
2792 | */ | |
2793 | ||
2794 | return cifs_user_readv(iocb, iov, nr_segs, pos); | |
2795 | } | |
1da177e4 | 2796 | |
f9c6e234 PS |
2797 | static ssize_t |
2798 | cifs_read(struct file *file, char *read_data, size_t read_size, loff_t *offset) | |
1da177e4 LT |
2799 | { |
2800 | int rc = -EACCES; | |
2801 | unsigned int bytes_read = 0; | |
2802 | unsigned int total_read; | |
2803 | unsigned int current_read_size; | |
5eba8ab3 | 2804 | unsigned int rsize; |
1da177e4 | 2805 | struct cifs_sb_info *cifs_sb; |
29e20f9c | 2806 | struct cifs_tcon *tcon; |
f9c6e234 | 2807 | struct TCP_Server_Info *server; |
6d5786a3 | 2808 | unsigned int xid; |
f9c6e234 | 2809 | char *cur_offset; |
1da177e4 | 2810 | struct cifsFileInfo *open_file; |
d4ffff1f | 2811 | struct cifs_io_parms io_parms; |
ec637e3f | 2812 | int buf_type = CIFS_NO_BUFFER; |
d4ffff1f | 2813 | __u32 pid; |
1da177e4 | 2814 | |
6d5786a3 | 2815 | xid = get_xid(); |
e6a00296 | 2816 | cifs_sb = CIFS_SB(file->f_path.dentry->d_sb); |
1da177e4 | 2817 | |
5eba8ab3 JL |
2818 | /* FIXME: set up handlers for larger reads and/or convert to async */ |
2819 | rsize = min_t(unsigned int, cifs_sb->rsize, CIFSMaxBufSize); | |
2820 | ||
1da177e4 | 2821 | if (file->private_data == NULL) { |
0f3bc09e | 2822 | rc = -EBADF; |
6d5786a3 | 2823 | free_xid(xid); |
0f3bc09e | 2824 | return rc; |
1da177e4 | 2825 | } |
c21dfb69 | 2826 | open_file = file->private_data; |
29e20f9c | 2827 | tcon = tlink_tcon(open_file->tlink); |
f9c6e234 PS |
2828 | server = tcon->ses->server; |
2829 | ||
2830 | if (!server->ops->sync_read) { | |
2831 | free_xid(xid); | |
2832 | return -ENOSYS; | |
2833 | } | |
1da177e4 | 2834 | |
d4ffff1f PS |
2835 | if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_RWPIDFORWARD) |
2836 | pid = open_file->pid; | |
2837 | else | |
2838 | pid = current->tgid; | |
2839 | ||
1da177e4 | 2840 | if ((file->f_flags & O_ACCMODE) == O_WRONLY) |
b6b38f70 | 2841 | cFYI(1, "attempting read on write only file instance"); |
1da177e4 | 2842 | |
f9c6e234 PS |
2843 | for (total_read = 0, cur_offset = read_data; read_size > total_read; |
2844 | total_read += bytes_read, cur_offset += bytes_read) { | |
5eba8ab3 | 2845 | current_read_size = min_t(uint, read_size - total_read, rsize); |
29e20f9c PS |
2846 | /* |
2847 | * For windows me and 9x we do not want to request more than it | |
2848 | * negotiated since it will refuse the read then. | |
2849 | */ | |
2850 | if ((tcon->ses) && !(tcon->ses->capabilities & | |
2851 | tcon->ses->server->vals->cap_large_files)) { | |
7748dd6e | 2852 | current_read_size = min_t(uint, current_read_size, |
c974befa | 2853 | CIFSMaxBufSize); |
f9f5c817 | 2854 | } |
1da177e4 LT |
2855 | rc = -EAGAIN; |
2856 | while (rc == -EAGAIN) { | |
cdff08e7 | 2857 | if (open_file->invalidHandle) { |
15886177 | 2858 | rc = cifs_reopen_file(open_file, true); |
1da177e4 LT |
2859 | if (rc != 0) |
2860 | break; | |
2861 | } | |
d4ffff1f | 2862 | io_parms.pid = pid; |
29e20f9c | 2863 | io_parms.tcon = tcon; |
f9c6e234 | 2864 | io_parms.offset = *offset; |
d4ffff1f | 2865 | io_parms.length = current_read_size; |
f9c6e234 PS |
2866 | rc = server->ops->sync_read(xid, open_file, &io_parms, |
2867 | &bytes_read, &cur_offset, | |
2868 | &buf_type); | |
1da177e4 LT |
2869 | } |
2870 | if (rc || (bytes_read == 0)) { | |
2871 | if (total_read) { | |
2872 | break; | |
2873 | } else { | |
6d5786a3 | 2874 | free_xid(xid); |
1da177e4 LT |
2875 | return rc; |
2876 | } | |
2877 | } else { | |
29e20f9c | 2878 | cifs_stats_bytes_read(tcon, total_read); |
f9c6e234 | 2879 | *offset += bytes_read; |
1da177e4 LT |
2880 | } |
2881 | } | |
6d5786a3 | 2882 | free_xid(xid); |
1da177e4 LT |
2883 | return total_read; |
2884 | } | |
2885 | ||
ca83ce3d JL |
2886 | /* |
2887 | * If the page is mmap'ed into a process' page tables, then we need to make | |
2888 | * sure that it doesn't change while being written back. | |
2889 | */ | |
2890 | static int | |
2891 | cifs_page_mkwrite(struct vm_area_struct *vma, struct vm_fault *vmf) | |
2892 | { | |
2893 | struct page *page = vmf->page; | |
2894 | ||
2895 | lock_page(page); | |
2896 | return VM_FAULT_LOCKED; | |
2897 | } | |
2898 | ||
2899 | static struct vm_operations_struct cifs_file_vm_ops = { | |
2900 | .fault = filemap_fault, | |
2901 | .page_mkwrite = cifs_page_mkwrite, | |
2902 | }; | |
2903 | ||
7a6a19b1 PS |
2904 | int cifs_file_strict_mmap(struct file *file, struct vm_area_struct *vma) |
2905 | { | |
2906 | int rc, xid; | |
2907 | struct inode *inode = file->f_path.dentry->d_inode; | |
2908 | ||
6d5786a3 | 2909 | xid = get_xid(); |
7a6a19b1 | 2910 | |
6feb9891 PS |
2911 | if (!CIFS_I(inode)->clientCanCacheRead) { |
2912 | rc = cifs_invalidate_mapping(inode); | |
2913 | if (rc) | |
2914 | return rc; | |
2915 | } | |
7a6a19b1 PS |
2916 | |
2917 | rc = generic_file_mmap(file, vma); | |
ca83ce3d JL |
2918 | if (rc == 0) |
2919 | vma->vm_ops = &cifs_file_vm_ops; | |
6d5786a3 | 2920 | free_xid(xid); |
7a6a19b1 PS |
2921 | return rc; |
2922 | } | |
2923 | ||
1da177e4 LT |
2924 | int cifs_file_mmap(struct file *file, struct vm_area_struct *vma) |
2925 | { | |
1da177e4 LT |
2926 | int rc, xid; |
2927 | ||
6d5786a3 | 2928 | xid = get_xid(); |
abab095d | 2929 | rc = cifs_revalidate_file(file); |
1da177e4 | 2930 | if (rc) { |
b6b38f70 | 2931 | cFYI(1, "Validation prior to mmap failed, error=%d", rc); |
6d5786a3 | 2932 | free_xid(xid); |
1da177e4 LT |
2933 | return rc; |
2934 | } | |
2935 | rc = generic_file_mmap(file, vma); | |
ca83ce3d JL |
2936 | if (rc == 0) |
2937 | vma->vm_ops = &cifs_file_vm_ops; | |
6d5786a3 | 2938 | free_xid(xid); |
1da177e4 LT |
2939 | return rc; |
2940 | } | |
2941 | ||
0471ca3f JL |
2942 | static void |
2943 | cifs_readv_complete(struct work_struct *work) | |
2944 | { | |
2945 | struct cifs_readdata *rdata = container_of(work, | |
2946 | struct cifs_readdata, work); | |
2947 | struct page *page, *tpage; | |
2948 | ||
2949 | list_for_each_entry_safe(page, tpage, &rdata->pages, lru) { | |
2950 | list_del(&page->lru); | |
2951 | lru_cache_add_file(page); | |
2952 | ||
2953 | if (rdata->result == 0) { | |
2954 | kunmap(page); | |
2955 | flush_dcache_page(page); | |
2956 | SetPageUptodate(page); | |
2957 | } | |
2958 | ||
2959 | unlock_page(page); | |
2960 | ||
2961 | if (rdata->result == 0) | |
2962 | cifs_readpage_to_fscache(rdata->mapping->host, page); | |
2963 | ||
2964 | page_cache_release(page); | |
2965 | } | |
6993f74a | 2966 | kref_put(&rdata->refcount, cifs_readdata_release); |
0471ca3f JL |
2967 | } |
2968 | ||
8d5ce4d2 JL |
2969 | static int |
2970 | cifs_readpages_marshal_iov(struct cifs_readdata *rdata, unsigned int remaining) | |
2971 | { | |
2972 | int len = 0; | |
2973 | struct page *page, *tpage; | |
2974 | u64 eof; | |
2975 | pgoff_t eof_index; | |
2976 | ||
2977 | /* determine the eof that the server (probably) has */ | |
2978 | eof = CIFS_I(rdata->mapping->host)->server_eof; | |
2979 | eof_index = eof ? (eof - 1) >> PAGE_CACHE_SHIFT : 0; | |
2980 | cFYI(1, "eof=%llu eof_index=%lu", eof, eof_index); | |
2981 | ||
2982 | rdata->nr_iov = 1; | |
2983 | list_for_each_entry_safe(page, tpage, &rdata->pages, lru) { | |
2984 | if (remaining >= PAGE_CACHE_SIZE) { | |
2985 | /* enough data to fill the page */ | |
2986 | rdata->iov[rdata->nr_iov].iov_base = kmap(page); | |
2987 | rdata->iov[rdata->nr_iov].iov_len = PAGE_CACHE_SIZE; | |
2988 | cFYI(1, "%u: idx=%lu iov_base=%p iov_len=%zu", | |
2989 | rdata->nr_iov, page->index, | |
2990 | rdata->iov[rdata->nr_iov].iov_base, | |
2991 | rdata->iov[rdata->nr_iov].iov_len); | |
2992 | ++rdata->nr_iov; | |
2993 | len += PAGE_CACHE_SIZE; | |
2994 | remaining -= PAGE_CACHE_SIZE; | |
2995 | } else if (remaining > 0) { | |
2996 | /* enough for partial page, fill and zero the rest */ | |
2997 | rdata->iov[rdata->nr_iov].iov_base = kmap(page); | |
2998 | rdata->iov[rdata->nr_iov].iov_len = remaining; | |
2999 | cFYI(1, "%u: idx=%lu iov_base=%p iov_len=%zu", | |
3000 | rdata->nr_iov, page->index, | |
3001 | rdata->iov[rdata->nr_iov].iov_base, | |
3002 | rdata->iov[rdata->nr_iov].iov_len); | |
3003 | memset(rdata->iov[rdata->nr_iov].iov_base + remaining, | |
3004 | '\0', PAGE_CACHE_SIZE - remaining); | |
3005 | ++rdata->nr_iov; | |
3006 | len += remaining; | |
3007 | remaining = 0; | |
3008 | } else if (page->index > eof_index) { | |
3009 | /* | |
3010 | * The VFS will not try to do readahead past the | |
3011 | * i_size, but it's possible that we have outstanding | |
3012 | * writes with gaps in the middle and the i_size hasn't | |
3013 | * caught up yet. Populate those with zeroed out pages | |
3014 | * to prevent the VFS from repeatedly attempting to | |
3015 | * fill them until the writes are flushed. | |
3016 | */ | |
3017 | zero_user(page, 0, PAGE_CACHE_SIZE); | |
3018 | list_del(&page->lru); | |
3019 | lru_cache_add_file(page); | |
3020 | flush_dcache_page(page); | |
3021 | SetPageUptodate(page); | |
3022 | unlock_page(page); | |
3023 | page_cache_release(page); | |
3024 | } else { | |
3025 | /* no need to hold page hostage */ | |
3026 | list_del(&page->lru); | |
3027 | lru_cache_add_file(page); | |
3028 | unlock_page(page); | |
3029 | page_cache_release(page); | |
3030 | } | |
3031 | } | |
3032 | ||
3033 | return len; | |
3034 | } | |
3035 | ||
1da177e4 LT |
3036 | static int cifs_readpages(struct file *file, struct address_space *mapping, |
3037 | struct list_head *page_list, unsigned num_pages) | |
3038 | { | |
690c5e31 JL |
3039 | int rc; |
3040 | struct list_head tmplist; | |
3041 | struct cifsFileInfo *open_file = file->private_data; | |
3042 | struct cifs_sb_info *cifs_sb = CIFS_SB(file->f_path.dentry->d_sb); | |
3043 | unsigned int rsize = cifs_sb->rsize; | |
3044 | pid_t pid; | |
1da177e4 | 3045 | |
690c5e31 JL |
3046 | /* |
3047 | * Give up immediately if rsize is too small to read an entire page. | |
3048 | * The VFS will fall back to readpage. We should never reach this | |
3049 | * point however since we set ra_pages to 0 when the rsize is smaller | |
3050 | * than a cache page. | |
3051 | */ | |
3052 | if (unlikely(rsize < PAGE_CACHE_SIZE)) | |
3053 | return 0; | |
bfa0d75a | 3054 | |
56698236 SJ |
3055 | /* |
3056 | * Reads as many pages as possible from fscache. Returns -ENOBUFS | |
3057 | * immediately if the cookie is negative | |
3058 | */ | |
3059 | rc = cifs_readpages_from_fscache(mapping->host, mapping, page_list, | |
3060 | &num_pages); | |
3061 | if (rc == 0) | |
690c5e31 | 3062 | return rc; |
56698236 | 3063 | |
d4ffff1f PS |
3064 | if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_RWPIDFORWARD) |
3065 | pid = open_file->pid; | |
3066 | else | |
3067 | pid = current->tgid; | |
3068 | ||
690c5e31 JL |
3069 | rc = 0; |
3070 | INIT_LIST_HEAD(&tmplist); | |
1da177e4 | 3071 | |
690c5e31 JL |
3072 | cFYI(1, "%s: file=%p mapping=%p num_pages=%u", __func__, file, |
3073 | mapping, num_pages); | |
3074 | ||
3075 | /* | |
3076 | * Start with the page at end of list and move it to private | |
3077 | * list. Do the same with any following pages until we hit | |
3078 | * the rsize limit, hit an index discontinuity, or run out of | |
3079 | * pages. Issue the async read and then start the loop again | |
3080 | * until the list is empty. | |
3081 | * | |
3082 | * Note that list order is important. The page_list is in | |
3083 | * the order of declining indexes. When we put the pages in | |
3084 | * the rdata->pages, then we want them in increasing order. | |
3085 | */ | |
3086 | while (!list_empty(page_list)) { | |
3087 | unsigned int bytes = PAGE_CACHE_SIZE; | |
3088 | unsigned int expected_index; | |
3089 | unsigned int nr_pages = 1; | |
3090 | loff_t offset; | |
3091 | struct page *page, *tpage; | |
3092 | struct cifs_readdata *rdata; | |
1da177e4 LT |
3093 | |
3094 | page = list_entry(page_list->prev, struct page, lru); | |
690c5e31 JL |
3095 | |
3096 | /* | |
3097 | * Lock the page and put it in the cache. Since no one else | |
3098 | * should have access to this page, we're safe to simply set | |
3099 | * PG_locked without checking it first. | |
3100 | */ | |
3101 | __set_page_locked(page); | |
3102 | rc = add_to_page_cache_locked(page, mapping, | |
3103 | page->index, GFP_KERNEL); | |
3104 | ||
3105 | /* give up if we can't stick it in the cache */ | |
3106 | if (rc) { | |
3107 | __clear_page_locked(page); | |
3108 | break; | |
3109 | } | |
3110 | ||
3111 | /* move first page to the tmplist */ | |
1da177e4 | 3112 | offset = (loff_t)page->index << PAGE_CACHE_SHIFT; |
690c5e31 | 3113 | list_move_tail(&page->lru, &tmplist); |
1da177e4 | 3114 | |
690c5e31 JL |
3115 | /* now try and add more pages onto the request */ |
3116 | expected_index = page->index + 1; | |
3117 | list_for_each_entry_safe_reverse(page, tpage, page_list, lru) { | |
3118 | /* discontinuity ? */ | |
3119 | if (page->index != expected_index) | |
fb8c4b14 | 3120 | break; |
690c5e31 JL |
3121 | |
3122 | /* would this page push the read over the rsize? */ | |
3123 | if (bytes + PAGE_CACHE_SIZE > rsize) | |
3124 | break; | |
3125 | ||
3126 | __set_page_locked(page); | |
3127 | if (add_to_page_cache_locked(page, mapping, | |
3128 | page->index, GFP_KERNEL)) { | |
3129 | __clear_page_locked(page); | |
3130 | break; | |
3131 | } | |
3132 | list_move_tail(&page->lru, &tmplist); | |
3133 | bytes += PAGE_CACHE_SIZE; | |
3134 | expected_index++; | |
3135 | nr_pages++; | |
1da177e4 | 3136 | } |
690c5e31 | 3137 | |
0471ca3f | 3138 | rdata = cifs_readdata_alloc(nr_pages, cifs_readv_complete); |
690c5e31 JL |
3139 | if (!rdata) { |
3140 | /* best to give up if we're out of mem */ | |
3141 | list_for_each_entry_safe(page, tpage, &tmplist, lru) { | |
3142 | list_del(&page->lru); | |
3143 | lru_cache_add_file(page); | |
3144 | unlock_page(page); | |
3145 | page_cache_release(page); | |
3146 | } | |
3147 | rc = -ENOMEM; | |
3148 | break; | |
3149 | } | |
3150 | ||
6993f74a | 3151 | rdata->cfile = cifsFileInfo_get(open_file); |
690c5e31 JL |
3152 | rdata->mapping = mapping; |
3153 | rdata->offset = offset; | |
3154 | rdata->bytes = bytes; | |
3155 | rdata->pid = pid; | |
8d5ce4d2 | 3156 | rdata->marshal_iov = cifs_readpages_marshal_iov; |
690c5e31 JL |
3157 | list_splice_init(&tmplist, &rdata->pages); |
3158 | ||
2a1bb138 | 3159 | rc = cifs_retry_async_readv(rdata); |
690c5e31 JL |
3160 | if (rc != 0) { |
3161 | list_for_each_entry_safe(page, tpage, &rdata->pages, | |
3162 | lru) { | |
3163 | list_del(&page->lru); | |
3164 | lru_cache_add_file(page); | |
3165 | unlock_page(page); | |
3166 | page_cache_release(page); | |
1da177e4 | 3167 | } |
6993f74a | 3168 | kref_put(&rdata->refcount, cifs_readdata_release); |
1da177e4 LT |
3169 | break; |
3170 | } | |
6993f74a JL |
3171 | |
3172 | kref_put(&rdata->refcount, cifs_readdata_release); | |
1da177e4 LT |
3173 | } |
3174 | ||
1da177e4 LT |
3175 | return rc; |
3176 | } | |
3177 | ||
3178 | static int cifs_readpage_worker(struct file *file, struct page *page, | |
3179 | loff_t *poffset) | |
3180 | { | |
3181 | char *read_data; | |
3182 | int rc; | |
3183 | ||
56698236 SJ |
3184 | /* Is the page cached? */ |
3185 | rc = cifs_readpage_from_fscache(file->f_path.dentry->d_inode, page); | |
3186 | if (rc == 0) | |
3187 | goto read_complete; | |
3188 | ||
1da177e4 LT |
3189 | page_cache_get(page); |
3190 | read_data = kmap(page); | |
3191 | /* for reads over a certain size could initiate async read ahead */ | |
fb8c4b14 | 3192 | |
1da177e4 | 3193 | rc = cifs_read(file, read_data, PAGE_CACHE_SIZE, poffset); |
fb8c4b14 | 3194 | |
1da177e4 LT |
3195 | if (rc < 0) |
3196 | goto io_error; | |
3197 | else | |
b6b38f70 | 3198 | cFYI(1, "Bytes read %d", rc); |
fb8c4b14 | 3199 | |
e6a00296 JJS |
3200 | file->f_path.dentry->d_inode->i_atime = |
3201 | current_fs_time(file->f_path.dentry->d_inode->i_sb); | |
fb8c4b14 | 3202 | |
1da177e4 LT |
3203 | if (PAGE_CACHE_SIZE > rc) |
3204 | memset(read_data + rc, 0, PAGE_CACHE_SIZE - rc); | |
3205 | ||
3206 | flush_dcache_page(page); | |
3207 | SetPageUptodate(page); | |
9dc06558 SJ |
3208 | |
3209 | /* send this page to the cache */ | |
3210 | cifs_readpage_to_fscache(file->f_path.dentry->d_inode, page); | |
3211 | ||
1da177e4 | 3212 | rc = 0; |
fb8c4b14 | 3213 | |
1da177e4 | 3214 | io_error: |
fb8c4b14 | 3215 | kunmap(page); |
1da177e4 | 3216 | page_cache_release(page); |
56698236 SJ |
3217 | |
3218 | read_complete: | |
1da177e4 LT |
3219 | return rc; |
3220 | } | |
3221 | ||
3222 | static int cifs_readpage(struct file *file, struct page *page) | |
3223 | { | |
3224 | loff_t offset = (loff_t)page->index << PAGE_CACHE_SHIFT; | |
3225 | int rc = -EACCES; | |
6d5786a3 | 3226 | unsigned int xid; |
1da177e4 | 3227 | |
6d5786a3 | 3228 | xid = get_xid(); |
1da177e4 LT |
3229 | |
3230 | if (file->private_data == NULL) { | |
0f3bc09e | 3231 | rc = -EBADF; |
6d5786a3 | 3232 | free_xid(xid); |
0f3bc09e | 3233 | return rc; |
1da177e4 LT |
3234 | } |
3235 | ||
ac3aa2f8 | 3236 | cFYI(1, "readpage %p at offset %d 0x%x", |
b6b38f70 | 3237 | page, (int)offset, (int)offset); |
1da177e4 LT |
3238 | |
3239 | rc = cifs_readpage_worker(file, page, &offset); | |
3240 | ||
3241 | unlock_page(page); | |
3242 | ||
6d5786a3 | 3243 | free_xid(xid); |
1da177e4 LT |
3244 | return rc; |
3245 | } | |
3246 | ||
a403a0a3 SF |
3247 | static int is_inode_writable(struct cifsInodeInfo *cifs_inode) |
3248 | { | |
3249 | struct cifsFileInfo *open_file; | |
3250 | ||
4477288a | 3251 | spin_lock(&cifs_file_list_lock); |
a403a0a3 | 3252 | list_for_each_entry(open_file, &cifs_inode->openFileList, flist) { |
2e396b83 | 3253 | if (OPEN_FMODE(open_file->f_flags) & FMODE_WRITE) { |
4477288a | 3254 | spin_unlock(&cifs_file_list_lock); |
a403a0a3 SF |
3255 | return 1; |
3256 | } | |
3257 | } | |
4477288a | 3258 | spin_unlock(&cifs_file_list_lock); |
a403a0a3 SF |
3259 | return 0; |
3260 | } | |
3261 | ||
1da177e4 LT |
3262 | /* We do not want to update the file size from server for inodes |
3263 | open for write - to avoid races with writepage extending | |
3264 | the file - in the future we could consider allowing | |
fb8c4b14 | 3265 | refreshing the inode only on increases in the file size |
1da177e4 LT |
3266 | but this is tricky to do without racing with writebehind |
3267 | page caching in the current Linux kernel design */ | |
4b18f2a9 | 3268 | bool is_size_safe_to_change(struct cifsInodeInfo *cifsInode, __u64 end_of_file) |
1da177e4 | 3269 | { |
a403a0a3 | 3270 | if (!cifsInode) |
4b18f2a9 | 3271 | return true; |
50c2f753 | 3272 | |
a403a0a3 SF |
3273 | if (is_inode_writable(cifsInode)) { |
3274 | /* This inode is open for write at least once */ | |
c32a0b68 SF |
3275 | struct cifs_sb_info *cifs_sb; |
3276 | ||
c32a0b68 | 3277 | cifs_sb = CIFS_SB(cifsInode->vfs_inode.i_sb); |
ad7a2926 | 3278 | if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DIRECT_IO) { |
fb8c4b14 | 3279 | /* since no page cache to corrupt on directio |
c32a0b68 | 3280 | we can change size safely */ |
4b18f2a9 | 3281 | return true; |
c32a0b68 SF |
3282 | } |
3283 | ||
fb8c4b14 | 3284 | if (i_size_read(&cifsInode->vfs_inode) < end_of_file) |
4b18f2a9 | 3285 | return true; |
7ba52631 | 3286 | |
4b18f2a9 | 3287 | return false; |
23e7dd7d | 3288 | } else |
4b18f2a9 | 3289 | return true; |
1da177e4 LT |
3290 | } |
3291 | ||
d9414774 NP |
3292 | static int cifs_write_begin(struct file *file, struct address_space *mapping, |
3293 | loff_t pos, unsigned len, unsigned flags, | |
3294 | struct page **pagep, void **fsdata) | |
1da177e4 | 3295 | { |
d9414774 NP |
3296 | pgoff_t index = pos >> PAGE_CACHE_SHIFT; |
3297 | loff_t offset = pos & (PAGE_CACHE_SIZE - 1); | |
a98ee8c1 JL |
3298 | loff_t page_start = pos & PAGE_MASK; |
3299 | loff_t i_size; | |
3300 | struct page *page; | |
3301 | int rc = 0; | |
d9414774 | 3302 | |
b6b38f70 | 3303 | cFYI(1, "write_begin from %lld len %d", (long long)pos, len); |
d9414774 | 3304 | |
54566b2c | 3305 | page = grab_cache_page_write_begin(mapping, index, flags); |
a98ee8c1 JL |
3306 | if (!page) { |
3307 | rc = -ENOMEM; | |
3308 | goto out; | |
3309 | } | |
8a236264 | 3310 | |
a98ee8c1 JL |
3311 | if (PageUptodate(page)) |
3312 | goto out; | |
8a236264 | 3313 | |
a98ee8c1 JL |
3314 | /* |
3315 | * If we write a full page it will be up to date, no need to read from | |
3316 | * the server. If the write is short, we'll end up doing a sync write | |
3317 | * instead. | |
3318 | */ | |
3319 | if (len == PAGE_CACHE_SIZE) | |
3320 | goto out; | |
8a236264 | 3321 | |
a98ee8c1 JL |
3322 | /* |
3323 | * optimize away the read when we have an oplock, and we're not | |
3324 | * expecting to use any of the data we'd be reading in. That | |
3325 | * is, when the page lies beyond the EOF, or straddles the EOF | |
3326 | * and the write will cover all of the existing data. | |
3327 | */ | |
3328 | if (CIFS_I(mapping->host)->clientCanCacheRead) { | |
3329 | i_size = i_size_read(mapping->host); | |
3330 | if (page_start >= i_size || | |
3331 | (offset == 0 && (pos + len) >= i_size)) { | |
3332 | zero_user_segments(page, 0, offset, | |
3333 | offset + len, | |
3334 | PAGE_CACHE_SIZE); | |
3335 | /* | |
3336 | * PageChecked means that the parts of the page | |
3337 | * to which we're not writing are considered up | |
3338 | * to date. Once the data is copied to the | |
3339 | * page, it can be set uptodate. | |
3340 | */ | |
3341 | SetPageChecked(page); | |
3342 | goto out; | |
3343 | } | |
3344 | } | |
d9414774 | 3345 | |
a98ee8c1 JL |
3346 | if ((file->f_flags & O_ACCMODE) != O_WRONLY) { |
3347 | /* | |
3348 | * might as well read a page, it is fast enough. If we get | |
3349 | * an error, we don't need to return it. cifs_write_end will | |
3350 | * do a sync write instead since PG_uptodate isn't set. | |
3351 | */ | |
3352 | cifs_readpage_worker(file, page, &page_start); | |
8a236264 SF |
3353 | } else { |
3354 | /* we could try using another file handle if there is one - | |
3355 | but how would we lock it to prevent close of that handle | |
3356 | racing with this read? In any case | |
d9414774 | 3357 | this will be written out by write_end so is fine */ |
1da177e4 | 3358 | } |
a98ee8c1 JL |
3359 | out: |
3360 | *pagep = page; | |
3361 | return rc; | |
1da177e4 LT |
3362 | } |
3363 | ||
85f2d6b4 SJ |
3364 | static int cifs_release_page(struct page *page, gfp_t gfp) |
3365 | { | |
3366 | if (PagePrivate(page)) | |
3367 | return 0; | |
3368 | ||
3369 | return cifs_fscache_release_page(page, gfp); | |
3370 | } | |
3371 | ||
3372 | static void cifs_invalidate_page(struct page *page, unsigned long offset) | |
3373 | { | |
3374 | struct cifsInodeInfo *cifsi = CIFS_I(page->mapping->host); | |
3375 | ||
3376 | if (offset == 0) | |
3377 | cifs_fscache_invalidate_page(page, &cifsi->vfs_inode); | |
3378 | } | |
3379 | ||
9ad1506b PS |
3380 | static int cifs_launder_page(struct page *page) |
3381 | { | |
3382 | int rc = 0; | |
3383 | loff_t range_start = page_offset(page); | |
3384 | loff_t range_end = range_start + (loff_t)(PAGE_CACHE_SIZE - 1); | |
3385 | struct writeback_control wbc = { | |
3386 | .sync_mode = WB_SYNC_ALL, | |
3387 | .nr_to_write = 0, | |
3388 | .range_start = range_start, | |
3389 | .range_end = range_end, | |
3390 | }; | |
3391 | ||
3392 | cFYI(1, "Launder page: %p", page); | |
3393 | ||
3394 | if (clear_page_dirty_for_io(page)) | |
3395 | rc = cifs_writepage_locked(page, &wbc); | |
3396 | ||
3397 | cifs_fscache_invalidate_page(page, page->mapping->host); | |
3398 | return rc; | |
3399 | } | |
3400 | ||
9b646972 | 3401 | void cifs_oplock_break(struct work_struct *work) |
3bc303c2 JL |
3402 | { |
3403 | struct cifsFileInfo *cfile = container_of(work, struct cifsFileInfo, | |
3404 | oplock_break); | |
a5e18bc3 | 3405 | struct inode *inode = cfile->dentry->d_inode; |
3bc303c2 | 3406 | struct cifsInodeInfo *cinode = CIFS_I(inode); |
eb4b756b | 3407 | int rc = 0; |
3bc303c2 JL |
3408 | |
3409 | if (inode && S_ISREG(inode->i_mode)) { | |
d54ff732 | 3410 | if (cinode->clientCanCacheRead) |
8737c930 | 3411 | break_lease(inode, O_RDONLY); |
d54ff732 | 3412 | else |
8737c930 | 3413 | break_lease(inode, O_WRONLY); |
3bc303c2 JL |
3414 | rc = filemap_fdatawrite(inode->i_mapping); |
3415 | if (cinode->clientCanCacheRead == 0) { | |
eb4b756b JL |
3416 | rc = filemap_fdatawait(inode->i_mapping); |
3417 | mapping_set_error(inode->i_mapping, rc); | |
3bc303c2 JL |
3418 | invalidate_remote_inode(inode); |
3419 | } | |
b6b38f70 | 3420 | cFYI(1, "Oplock flush inode %p rc %d", inode, rc); |
3bc303c2 JL |
3421 | } |
3422 | ||
85160e03 PS |
3423 | rc = cifs_push_locks(cfile); |
3424 | if (rc) | |
3425 | cERROR(1, "Push locks rc = %d", rc); | |
3426 | ||
3bc303c2 JL |
3427 | /* |
3428 | * releasing stale oplock after recent reconnect of smb session using | |
3429 | * a now incorrect file handle is not a data integrity issue but do | |
3430 | * not bother sending an oplock release if session to server still is | |
3431 | * disconnected since oplock already released by the server | |
3432 | */ | |
cdff08e7 | 3433 | if (!cfile->oplock_break_cancelled) { |
4b4de76e | 3434 | rc = CIFSSMBLock(0, tlink_tcon(cfile->tlink), cfile->fid.netfid, |
03776f45 PS |
3435 | current->tgid, 0, 0, 0, 0, |
3436 | LOCKING_ANDX_OPLOCK_RELEASE, false, | |
12fed00d | 3437 | cinode->clientCanCacheRead ? 1 : 0); |
b6b38f70 | 3438 | cFYI(1, "Oplock release rc = %d", rc); |
3bc303c2 | 3439 | } |
3bc303c2 JL |
3440 | } |
3441 | ||
f5e54d6e | 3442 | const struct address_space_operations cifs_addr_ops = { |
1da177e4 LT |
3443 | .readpage = cifs_readpage, |
3444 | .readpages = cifs_readpages, | |
3445 | .writepage = cifs_writepage, | |
37c0eb46 | 3446 | .writepages = cifs_writepages, |
d9414774 NP |
3447 | .write_begin = cifs_write_begin, |
3448 | .write_end = cifs_write_end, | |
1da177e4 | 3449 | .set_page_dirty = __set_page_dirty_nobuffers, |
85f2d6b4 SJ |
3450 | .releasepage = cifs_release_page, |
3451 | .invalidatepage = cifs_invalidate_page, | |
9ad1506b | 3452 | .launder_page = cifs_launder_page, |
1da177e4 | 3453 | }; |
273d81d6 DK |
3454 | |
3455 | /* | |
3456 | * cifs_readpages requires the server to support a buffer large enough to | |
3457 | * contain the header plus one complete page of data. Otherwise, we need | |
3458 | * to leave cifs_readpages out of the address space operations. | |
3459 | */ | |
f5e54d6e | 3460 | const struct address_space_operations cifs_addr_ops_smallbuf = { |
273d81d6 DK |
3461 | .readpage = cifs_readpage, |
3462 | .writepage = cifs_writepage, | |
3463 | .writepages = cifs_writepages, | |
d9414774 NP |
3464 | .write_begin = cifs_write_begin, |
3465 | .write_end = cifs_write_end, | |
273d81d6 | 3466 | .set_page_dirty = __set_page_dirty_nobuffers, |
85f2d6b4 SJ |
3467 | .releasepage = cifs_release_page, |
3468 | .invalidatepage = cifs_invalidate_page, | |
9ad1506b | 3469 | .launder_page = cifs_launder_page, |
273d81d6 | 3470 | }; |