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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; | |
f45d3416 | 248 | struct cifs_fid_locks *fdlocks; |
4b4de76e PS |
249 | |
250 | cfile = kzalloc(sizeof(struct cifsFileInfo), GFP_KERNEL); | |
251 | if (cfile == NULL) | |
252 | return cfile; | |
253 | ||
f45d3416 PS |
254 | fdlocks = kzalloc(sizeof(struct cifs_fid_locks), GFP_KERNEL); |
255 | if (!fdlocks) { | |
256 | kfree(cfile); | |
257 | return NULL; | |
258 | } | |
259 | ||
260 | INIT_LIST_HEAD(&fdlocks->locks); | |
261 | fdlocks->cfile = cfile; | |
262 | cfile->llist = fdlocks; | |
263 | mutex_lock(&cinode->lock_mutex); | |
264 | list_add(&fdlocks->llist, &cinode->llist); | |
265 | mutex_unlock(&cinode->lock_mutex); | |
266 | ||
4b4de76e | 267 | cfile->count = 1; |
4b4de76e PS |
268 | cfile->pid = current->tgid; |
269 | cfile->uid = current_fsuid(); | |
270 | cfile->dentry = dget(dentry); | |
271 | cfile->f_flags = file->f_flags; | |
272 | cfile->invalidHandle = false; | |
273 | cfile->tlink = cifs_get_tlink(tlink); | |
4b4de76e | 274 | INIT_WORK(&cfile->oplock_break, cifs_oplock_break); |
f45d3416 | 275 | mutex_init(&cfile->fh_mutex); |
fb1214e4 | 276 | tlink_tcon(tlink)->ses->server->ops->set_fid(cfile, fid, oplock); |
15ecb436 | 277 | |
4477288a | 278 | spin_lock(&cifs_file_list_lock); |
4b4de76e | 279 | list_add(&cfile->tlist, &(tlink_tcon(tlink)->openFileList)); |
15ecb436 JL |
280 | /* if readable file instance put first in list*/ |
281 | if (file->f_mode & FMODE_READ) | |
4b4de76e | 282 | list_add(&cfile->flist, &cinode->openFileList); |
15ecb436 | 283 | else |
4b4de76e | 284 | list_add_tail(&cfile->flist, &cinode->openFileList); |
4477288a | 285 | spin_unlock(&cifs_file_list_lock); |
15ecb436 | 286 | |
4b4de76e PS |
287 | file->private_data = cfile; |
288 | return cfile; | |
15ecb436 JL |
289 | } |
290 | ||
85160e03 PS |
291 | static void cifs_del_lock_waiters(struct cifsLockInfo *lock); |
292 | ||
764a1b1a JL |
293 | struct cifsFileInfo * |
294 | cifsFileInfo_get(struct cifsFileInfo *cifs_file) | |
295 | { | |
296 | spin_lock(&cifs_file_list_lock); | |
297 | cifsFileInfo_get_locked(cifs_file); | |
298 | spin_unlock(&cifs_file_list_lock); | |
299 | return cifs_file; | |
300 | } | |
301 | ||
cdff08e7 SF |
302 | /* |
303 | * Release a reference on the file private data. This may involve closing | |
5f6dbc9e JL |
304 | * the filehandle out on the server. Must be called without holding |
305 | * cifs_file_list_lock. | |
cdff08e7 | 306 | */ |
b33879aa JL |
307 | void cifsFileInfo_put(struct cifsFileInfo *cifs_file) |
308 | { | |
e66673e3 | 309 | struct inode *inode = cifs_file->dentry->d_inode; |
96daf2b0 | 310 | struct cifs_tcon *tcon = tlink_tcon(cifs_file->tlink); |
e66673e3 | 311 | struct cifsInodeInfo *cifsi = CIFS_I(inode); |
4f8ba8a0 | 312 | struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb); |
cdff08e7 SF |
313 | struct cifsLockInfo *li, *tmp; |
314 | ||
315 | spin_lock(&cifs_file_list_lock); | |
5f6dbc9e | 316 | if (--cifs_file->count > 0) { |
cdff08e7 SF |
317 | spin_unlock(&cifs_file_list_lock); |
318 | return; | |
319 | } | |
320 | ||
321 | /* remove it from the lists */ | |
322 | list_del(&cifs_file->flist); | |
323 | list_del(&cifs_file->tlist); | |
324 | ||
325 | if (list_empty(&cifsi->openFileList)) { | |
326 | cFYI(1, "closing last open instance for inode %p", | |
327 | cifs_file->dentry->d_inode); | |
25364138 PS |
328 | /* |
329 | * In strict cache mode we need invalidate mapping on the last | |
330 | * close because it may cause a error when we open this file | |
331 | * again and get at least level II oplock. | |
332 | */ | |
4f8ba8a0 PS |
333 | if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_STRICT_IO) |
334 | CIFS_I(inode)->invalid_mapping = true; | |
c6723628 | 335 | cifs_set_oplock_level(cifsi, 0); |
cdff08e7 SF |
336 | } |
337 | spin_unlock(&cifs_file_list_lock); | |
338 | ||
ad635942 JL |
339 | cancel_work_sync(&cifs_file->oplock_break); |
340 | ||
cdff08e7 | 341 | if (!tcon->need_reconnect && !cifs_file->invalidHandle) { |
0ff78a22 | 342 | struct TCP_Server_Info *server = tcon->ses->server; |
6d5786a3 | 343 | unsigned int xid; |
0ff78a22 PS |
344 | int rc = -ENOSYS; |
345 | ||
6d5786a3 | 346 | xid = get_xid(); |
0ff78a22 PS |
347 | if (server->ops->close) |
348 | rc = server->ops->close(xid, tcon, &cifs_file->fid); | |
6d5786a3 | 349 | free_xid(xid); |
cdff08e7 SF |
350 | } |
351 | ||
f45d3416 PS |
352 | /* |
353 | * Delete any outstanding lock records. We'll lose them when the file | |
cdff08e7 SF |
354 | * is closed anyway. |
355 | */ | |
d59dad2b | 356 | mutex_lock(&cifsi->lock_mutex); |
f45d3416 | 357 | list_for_each_entry_safe(li, tmp, &cifs_file->llist->locks, llist) { |
cdff08e7 | 358 | list_del(&li->llist); |
85160e03 | 359 | cifs_del_lock_waiters(li); |
cdff08e7 | 360 | kfree(li); |
b33879aa | 361 | } |
f45d3416 PS |
362 | list_del(&cifs_file->llist->llist); |
363 | kfree(cifs_file->llist); | |
d59dad2b | 364 | mutex_unlock(&cifsi->lock_mutex); |
cdff08e7 SF |
365 | |
366 | cifs_put_tlink(cifs_file->tlink); | |
367 | dput(cifs_file->dentry); | |
368 | kfree(cifs_file); | |
b33879aa JL |
369 | } |
370 | ||
1da177e4 LT |
371 | int cifs_open(struct inode *inode, struct file *file) |
372 | { | |
373 | int rc = -EACCES; | |
6d5786a3 | 374 | unsigned int xid; |
590a3fe0 | 375 | __u32 oplock; |
1da177e4 | 376 | struct cifs_sb_info *cifs_sb; |
96daf2b0 | 377 | struct cifs_tcon *tcon; |
7ffec372 | 378 | struct tcon_link *tlink; |
fb1214e4 | 379 | struct cifsFileInfo *cfile = NULL; |
1da177e4 | 380 | char *full_path = NULL; |
7e12eddb | 381 | bool posix_open_ok = false; |
fb1214e4 | 382 | struct cifs_fid fid; |
1da177e4 | 383 | |
6d5786a3 | 384 | xid = get_xid(); |
1da177e4 LT |
385 | |
386 | cifs_sb = CIFS_SB(inode->i_sb); | |
7ffec372 JL |
387 | tlink = cifs_sb_tlink(cifs_sb); |
388 | if (IS_ERR(tlink)) { | |
6d5786a3 | 389 | free_xid(xid); |
7ffec372 JL |
390 | return PTR_ERR(tlink); |
391 | } | |
392 | tcon = tlink_tcon(tlink); | |
1da177e4 | 393 | |
e6a00296 | 394 | full_path = build_path_from_dentry(file->f_path.dentry); |
1da177e4 | 395 | if (full_path == NULL) { |
0f3bc09e | 396 | rc = -ENOMEM; |
232341ba | 397 | goto out; |
1da177e4 LT |
398 | } |
399 | ||
b6b38f70 JP |
400 | cFYI(1, "inode = 0x%p file flags are 0x%x for %s", |
401 | inode, file->f_flags, full_path); | |
276a74a4 | 402 | |
10b9b98e | 403 | if (tcon->ses->server->oplocks) |
276a74a4 SF |
404 | oplock = REQ_OPLOCK; |
405 | else | |
406 | oplock = 0; | |
407 | ||
64cc2c63 | 408 | if (!tcon->broken_posix_open && tcon->unix_ext && |
29e20f9c PS |
409 | cap_unix(tcon->ses) && (CIFS_UNIX_POSIX_PATH_OPS_CAP & |
410 | le64_to_cpu(tcon->fsUnixInfo.Capability))) { | |
276a74a4 | 411 | /* can not refresh inode info since size could be stale */ |
2422f676 | 412 | rc = cifs_posix_open(full_path, &inode, inode->i_sb, |
fa588e0c | 413 | cifs_sb->mnt_file_mode /* ignored */, |
fb1214e4 | 414 | file->f_flags, &oplock, &fid.netfid, xid); |
276a74a4 | 415 | if (rc == 0) { |
b6b38f70 | 416 | cFYI(1, "posix open succeeded"); |
7e12eddb | 417 | posix_open_ok = true; |
64cc2c63 SF |
418 | } else if ((rc == -EINVAL) || (rc == -EOPNOTSUPP)) { |
419 | if (tcon->ses->serverNOS) | |
b6b38f70 | 420 | cERROR(1, "server %s of type %s returned" |
64cc2c63 SF |
421 | " unexpected error on SMB posix open" |
422 | ", disabling posix open support." | |
423 | " Check if server update available.", | |
424 | tcon->ses->serverName, | |
b6b38f70 | 425 | tcon->ses->serverNOS); |
64cc2c63 | 426 | tcon->broken_posix_open = true; |
276a74a4 SF |
427 | } else if ((rc != -EIO) && (rc != -EREMOTE) && |
428 | (rc != -EOPNOTSUPP)) /* path not found or net err */ | |
429 | goto out; | |
fb1214e4 PS |
430 | /* |
431 | * Else fallthrough to retry open the old way on network i/o | |
432 | * or DFS errors. | |
433 | */ | |
276a74a4 SF |
434 | } |
435 | ||
7e12eddb PS |
436 | if (!posix_open_ok) { |
437 | rc = cifs_nt_open(full_path, inode, cifs_sb, tcon, | |
fb1214e4 | 438 | file->f_flags, &oplock, &fid, xid); |
7e12eddb PS |
439 | if (rc) |
440 | goto out; | |
441 | } | |
47c78b7f | 442 | |
fb1214e4 PS |
443 | cfile = cifs_new_fileinfo(&fid, file, tlink, oplock); |
444 | if (cfile == NULL) { | |
0ff78a22 PS |
445 | if (tcon->ses->server->ops->close) |
446 | tcon->ses->server->ops->close(xid, tcon, &fid); | |
1da177e4 LT |
447 | rc = -ENOMEM; |
448 | goto out; | |
449 | } | |
1da177e4 | 450 | |
9451a9a5 SJ |
451 | cifs_fscache_set_inode_cookie(inode, file); |
452 | ||
7e12eddb | 453 | if ((oplock & CIFS_CREATE_ACTION) && !posix_open_ok && tcon->unix_ext) { |
fb1214e4 PS |
454 | /* |
455 | * Time to set mode which we can not set earlier due to | |
456 | * problems creating new read-only files. | |
457 | */ | |
7e12eddb PS |
458 | struct cifs_unix_set_info_args args = { |
459 | .mode = inode->i_mode, | |
460 | .uid = NO_CHANGE_64, | |
461 | .gid = NO_CHANGE_64, | |
462 | .ctime = NO_CHANGE_64, | |
463 | .atime = NO_CHANGE_64, | |
464 | .mtime = NO_CHANGE_64, | |
465 | .device = 0, | |
466 | }; | |
fb1214e4 PS |
467 | CIFSSMBUnixSetFileInfo(xid, tcon, &args, fid.netfid, |
468 | cfile->pid); | |
1da177e4 LT |
469 | } |
470 | ||
471 | out: | |
1da177e4 | 472 | kfree(full_path); |
6d5786a3 | 473 | free_xid(xid); |
7ffec372 | 474 | cifs_put_tlink(tlink); |
1da177e4 LT |
475 | return rc; |
476 | } | |
477 | ||
2ae78ba8 PS |
478 | /* |
479 | * Try to reacquire byte range locks that were released when session | |
480 | * to server was lost | |
481 | */ | |
1da177e4 LT |
482 | static int cifs_relock_file(struct cifsFileInfo *cifsFile) |
483 | { | |
484 | int rc = 0; | |
485 | ||
2ae78ba8 | 486 | /* BB list all locks open on this file and relock */ |
1da177e4 LT |
487 | |
488 | return rc; | |
489 | } | |
490 | ||
2ae78ba8 PS |
491 | static int |
492 | cifs_reopen_file(struct cifsFileInfo *cfile, bool can_flush) | |
1da177e4 LT |
493 | { |
494 | int rc = -EACCES; | |
6d5786a3 | 495 | unsigned int xid; |
590a3fe0 | 496 | __u32 oplock; |
1da177e4 | 497 | struct cifs_sb_info *cifs_sb; |
96daf2b0 | 498 | struct cifs_tcon *tcon; |
2ae78ba8 PS |
499 | struct TCP_Server_Info *server; |
500 | struct cifsInodeInfo *cinode; | |
fb8c4b14 | 501 | struct inode *inode; |
1da177e4 | 502 | char *full_path = NULL; |
2ae78ba8 | 503 | int desired_access; |
1da177e4 | 504 | int disposition = FILE_OPEN; |
3d3ea8e6 | 505 | int create_options = CREATE_NOT_DIR; |
2ae78ba8 | 506 | struct cifs_fid fid; |
1da177e4 | 507 | |
6d5786a3 | 508 | xid = get_xid(); |
2ae78ba8 PS |
509 | mutex_lock(&cfile->fh_mutex); |
510 | if (!cfile->invalidHandle) { | |
511 | mutex_unlock(&cfile->fh_mutex); | |
0f3bc09e | 512 | rc = 0; |
6d5786a3 | 513 | free_xid(xid); |
0f3bc09e | 514 | return rc; |
1da177e4 LT |
515 | } |
516 | ||
2ae78ba8 | 517 | inode = cfile->dentry->d_inode; |
1da177e4 | 518 | cifs_sb = CIFS_SB(inode->i_sb); |
2ae78ba8 PS |
519 | tcon = tlink_tcon(cfile->tlink); |
520 | server = tcon->ses->server; | |
521 | ||
522 | /* | |
523 | * Can not grab rename sem here because various ops, including those | |
524 | * that already have the rename sem can end up causing writepage to get | |
525 | * called and if the server was down that means we end up here, and we | |
526 | * can never tell if the caller already has the rename_sem. | |
527 | */ | |
528 | full_path = build_path_from_dentry(cfile->dentry); | |
1da177e4 | 529 | if (full_path == NULL) { |
3a9f462f | 530 | rc = -ENOMEM; |
2ae78ba8 | 531 | mutex_unlock(&cfile->fh_mutex); |
6d5786a3 | 532 | free_xid(xid); |
3a9f462f | 533 | return rc; |
1da177e4 LT |
534 | } |
535 | ||
2ae78ba8 PS |
536 | cFYI(1, "inode = 0x%p file flags 0x%x for %s", inode, cfile->f_flags, |
537 | full_path); | |
1da177e4 | 538 | |
10b9b98e | 539 | if (tcon->ses->server->oplocks) |
1da177e4 LT |
540 | oplock = REQ_OPLOCK; |
541 | else | |
4b18f2a9 | 542 | oplock = 0; |
1da177e4 | 543 | |
29e20f9c | 544 | if (tcon->unix_ext && cap_unix(tcon->ses) && |
7fc8f4e9 | 545 | (CIFS_UNIX_POSIX_PATH_OPS_CAP & |
29e20f9c | 546 | le64_to_cpu(tcon->fsUnixInfo.Capability))) { |
608712fe JL |
547 | /* |
548 | * O_CREAT, O_EXCL and O_TRUNC already had their effect on the | |
549 | * original open. Must mask them off for a reopen. | |
550 | */ | |
2ae78ba8 | 551 | unsigned int oflags = cfile->f_flags & |
15886177 | 552 | ~(O_CREAT | O_EXCL | O_TRUNC); |
608712fe | 553 | |
2422f676 | 554 | rc = cifs_posix_open(full_path, NULL, inode->i_sb, |
2ae78ba8 PS |
555 | cifs_sb->mnt_file_mode /* ignored */, |
556 | oflags, &oplock, &fid.netfid, xid); | |
7fc8f4e9 | 557 | if (rc == 0) { |
b6b38f70 | 558 | cFYI(1, "posix reopen succeeded"); |
7fc8f4e9 SF |
559 | goto reopen_success; |
560 | } | |
2ae78ba8 PS |
561 | /* |
562 | * fallthrough to retry open the old way on errors, especially | |
563 | * in the reconnect path it is important to retry hard | |
564 | */ | |
7fc8f4e9 SF |
565 | } |
566 | ||
2ae78ba8 | 567 | desired_access = cifs_convert_flags(cfile->f_flags); |
7fc8f4e9 | 568 | |
3d3ea8e6 SP |
569 | if (backup_cred(cifs_sb)) |
570 | create_options |= CREATE_OPEN_BACKUP_INTENT; | |
571 | ||
2ae78ba8 PS |
572 | /* |
573 | * Can not refresh inode by passing in file_info buf to be returned by | |
574 | * CIFSSMBOpen and then calling get_inode_info with returned buf since | |
575 | * file might have write behind data that needs to be flushed and server | |
576 | * version of file size can be stale. If we knew for sure that inode was | |
577 | * not dirty locally we could do this. | |
578 | */ | |
579 | rc = server->ops->open(xid, tcon, full_path, disposition, | |
580 | desired_access, create_options, &fid, &oplock, | |
581 | NULL, cifs_sb); | |
1da177e4 | 582 | if (rc) { |
2ae78ba8 PS |
583 | mutex_unlock(&cfile->fh_mutex); |
584 | cFYI(1, "cifs_reopen returned 0x%x", rc); | |
b6b38f70 | 585 | cFYI(1, "oplock: %d", oplock); |
15886177 JL |
586 | goto reopen_error_exit; |
587 | } | |
588 | ||
7fc8f4e9 | 589 | reopen_success: |
2ae78ba8 PS |
590 | cfile->invalidHandle = false; |
591 | mutex_unlock(&cfile->fh_mutex); | |
592 | cinode = CIFS_I(inode); | |
15886177 JL |
593 | |
594 | if (can_flush) { | |
595 | rc = filemap_write_and_wait(inode->i_mapping); | |
eb4b756b | 596 | mapping_set_error(inode->i_mapping, rc); |
15886177 | 597 | |
15886177 | 598 | if (tcon->unix_ext) |
2ae78ba8 PS |
599 | rc = cifs_get_inode_info_unix(&inode, full_path, |
600 | inode->i_sb, xid); | |
15886177 | 601 | else |
2ae78ba8 PS |
602 | rc = cifs_get_inode_info(&inode, full_path, NULL, |
603 | inode->i_sb, xid, NULL); | |
604 | } | |
605 | /* | |
606 | * Else we are writing out data to server already and could deadlock if | |
607 | * we tried to flush data, and since we do not know if we have data that | |
608 | * would invalidate the current end of file on the server we can not go | |
609 | * to the server to get the new inode info. | |
610 | */ | |
611 | ||
612 | server->ops->set_fid(cfile, &fid, oplock); | |
613 | cifs_relock_file(cfile); | |
15886177 JL |
614 | |
615 | reopen_error_exit: | |
1da177e4 | 616 | kfree(full_path); |
6d5786a3 | 617 | free_xid(xid); |
1da177e4 LT |
618 | return rc; |
619 | } | |
620 | ||
621 | int cifs_close(struct inode *inode, struct file *file) | |
622 | { | |
77970693 JL |
623 | if (file->private_data != NULL) { |
624 | cifsFileInfo_put(file->private_data); | |
625 | file->private_data = NULL; | |
626 | } | |
7ee1af76 | 627 | |
cdff08e7 SF |
628 | /* return code from the ->release op is always ignored */ |
629 | return 0; | |
1da177e4 LT |
630 | } |
631 | ||
632 | int cifs_closedir(struct inode *inode, struct file *file) | |
633 | { | |
634 | int rc = 0; | |
6d5786a3 | 635 | unsigned int xid; |
4b4de76e | 636 | struct cifsFileInfo *cfile = file->private_data; |
92fc65a7 PS |
637 | struct cifs_tcon *tcon; |
638 | struct TCP_Server_Info *server; | |
639 | char *buf; | |
1da177e4 | 640 | |
b6b38f70 | 641 | cFYI(1, "Closedir inode = 0x%p", inode); |
1da177e4 | 642 | |
92fc65a7 PS |
643 | if (cfile == NULL) |
644 | return rc; | |
645 | ||
6d5786a3 | 646 | xid = get_xid(); |
92fc65a7 PS |
647 | tcon = tlink_tcon(cfile->tlink); |
648 | server = tcon->ses->server; | |
1da177e4 | 649 | |
92fc65a7 PS |
650 | cFYI(1, "Freeing private data in close dir"); |
651 | spin_lock(&cifs_file_list_lock); | |
652 | if (!cfile->srch_inf.endOfSearch && !cfile->invalidHandle) { | |
653 | cfile->invalidHandle = true; | |
654 | spin_unlock(&cifs_file_list_lock); | |
655 | if (server->ops->close_dir) | |
656 | rc = server->ops->close_dir(xid, tcon, &cfile->fid); | |
657 | else | |
658 | rc = -ENOSYS; | |
659 | cFYI(1, "Closing uncompleted readdir with rc %d", rc); | |
660 | /* not much we can do if it fails anyway, ignore rc */ | |
661 | rc = 0; | |
662 | } else | |
663 | spin_unlock(&cifs_file_list_lock); | |
664 | ||
665 | buf = cfile->srch_inf.ntwrk_buf_start; | |
666 | if (buf) { | |
667 | cFYI(1, "closedir free smb buf in srch struct"); | |
668 | cfile->srch_inf.ntwrk_buf_start = NULL; | |
669 | if (cfile->srch_inf.smallBuf) | |
670 | cifs_small_buf_release(buf); | |
671 | else | |
672 | cifs_buf_release(buf); | |
1da177e4 | 673 | } |
92fc65a7 PS |
674 | |
675 | cifs_put_tlink(cfile->tlink); | |
676 | kfree(file->private_data); | |
677 | file->private_data = NULL; | |
1da177e4 | 678 | /* BB can we lock the filestruct while this is going on? */ |
6d5786a3 | 679 | free_xid(xid); |
1da177e4 LT |
680 | return rc; |
681 | } | |
682 | ||
85160e03 | 683 | static struct cifsLockInfo * |
fbd35aca | 684 | cifs_lock_init(__u64 offset, __u64 length, __u8 type) |
7ee1af76 | 685 | { |
a88b4707 | 686 | struct cifsLockInfo *lock = |
fb8c4b14 | 687 | kmalloc(sizeof(struct cifsLockInfo), GFP_KERNEL); |
a88b4707 PS |
688 | if (!lock) |
689 | return lock; | |
690 | lock->offset = offset; | |
691 | lock->length = length; | |
692 | lock->type = type; | |
a88b4707 PS |
693 | lock->pid = current->tgid; |
694 | INIT_LIST_HEAD(&lock->blist); | |
695 | init_waitqueue_head(&lock->block_q); | |
696 | return lock; | |
85160e03 PS |
697 | } |
698 | ||
699 | static void | |
700 | cifs_del_lock_waiters(struct cifsLockInfo *lock) | |
701 | { | |
702 | struct cifsLockInfo *li, *tmp; | |
703 | list_for_each_entry_safe(li, tmp, &lock->blist, blist) { | |
704 | list_del_init(&li->blist); | |
705 | wake_up(&li->block_q); | |
706 | } | |
707 | } | |
708 | ||
709 | static bool | |
f45d3416 PS |
710 | cifs_find_fid_lock_conflict(struct cifs_fid_locks *fdlocks, __u64 offset, |
711 | __u64 length, __u8 type, struct cifsFileInfo *cfile, | |
fbd35aca | 712 | struct cifsLockInfo **conf_lock) |
85160e03 | 713 | { |
fbd35aca | 714 | struct cifsLockInfo *li; |
f45d3416 | 715 | struct cifsFileInfo *cur_cfile = fdlocks->cfile; |
106dc538 | 716 | struct TCP_Server_Info *server = tlink_tcon(cfile->tlink)->ses->server; |
85160e03 | 717 | |
f45d3416 | 718 | list_for_each_entry(li, &fdlocks->locks, llist) { |
85160e03 PS |
719 | if (offset + length <= li->offset || |
720 | offset >= li->offset + li->length) | |
721 | continue; | |
f45d3416 PS |
722 | if ((type & server->vals->shared_lock_type) && |
723 | ((server->ops->compare_fids(cfile, cur_cfile) && | |
724 | current->tgid == li->pid) || type == li->type)) | |
85160e03 | 725 | continue; |
f45d3416 PS |
726 | *conf_lock = li; |
727 | return true; | |
85160e03 PS |
728 | } |
729 | return false; | |
730 | } | |
731 | ||
161ebf9f | 732 | static bool |
55157dfb PS |
733 | cifs_find_lock_conflict(struct cifsFileInfo *cfile, __u64 offset, __u64 length, |
734 | __u8 type, struct cifsLockInfo **conf_lock) | |
161ebf9f | 735 | { |
fbd35aca | 736 | bool rc = false; |
f45d3416 | 737 | struct cifs_fid_locks *cur; |
55157dfb | 738 | struct cifsInodeInfo *cinode = CIFS_I(cfile->dentry->d_inode); |
fbd35aca | 739 | |
f45d3416 PS |
740 | list_for_each_entry(cur, &cinode->llist, llist) { |
741 | rc = cifs_find_fid_lock_conflict(cur, offset, length, type, | |
55157dfb | 742 | cfile, conf_lock); |
fbd35aca PS |
743 | if (rc) |
744 | break; | |
745 | } | |
fbd35aca PS |
746 | |
747 | return rc; | |
161ebf9f PS |
748 | } |
749 | ||
9a5101c8 PS |
750 | /* |
751 | * Check if there is another lock that prevents us to set the lock (mandatory | |
752 | * style). If such a lock exists, update the flock structure with its | |
753 | * properties. Otherwise, set the flock type to F_UNLCK if we can cache brlocks | |
754 | * or leave it the same if we can't. Returns 0 if we don't need to request to | |
755 | * the server or 1 otherwise. | |
756 | */ | |
85160e03 | 757 | static int |
fbd35aca PS |
758 | cifs_lock_test(struct cifsFileInfo *cfile, __u64 offset, __u64 length, |
759 | __u8 type, struct file_lock *flock) | |
85160e03 PS |
760 | { |
761 | int rc = 0; | |
762 | struct cifsLockInfo *conf_lock; | |
fbd35aca | 763 | struct cifsInodeInfo *cinode = CIFS_I(cfile->dentry->d_inode); |
106dc538 | 764 | struct TCP_Server_Info *server = tlink_tcon(cfile->tlink)->ses->server; |
85160e03 PS |
765 | bool exist; |
766 | ||
767 | mutex_lock(&cinode->lock_mutex); | |
768 | ||
55157dfb PS |
769 | exist = cifs_find_lock_conflict(cfile, offset, length, type, |
770 | &conf_lock); | |
85160e03 PS |
771 | if (exist) { |
772 | flock->fl_start = conf_lock->offset; | |
773 | flock->fl_end = conf_lock->offset + conf_lock->length - 1; | |
774 | flock->fl_pid = conf_lock->pid; | |
106dc538 | 775 | if (conf_lock->type & server->vals->shared_lock_type) |
85160e03 PS |
776 | flock->fl_type = F_RDLCK; |
777 | else | |
778 | flock->fl_type = F_WRLCK; | |
779 | } else if (!cinode->can_cache_brlcks) | |
780 | rc = 1; | |
781 | else | |
782 | flock->fl_type = F_UNLCK; | |
783 | ||
784 | mutex_unlock(&cinode->lock_mutex); | |
785 | return rc; | |
786 | } | |
787 | ||
161ebf9f | 788 | static void |
fbd35aca | 789 | cifs_lock_add(struct cifsFileInfo *cfile, struct cifsLockInfo *lock) |
85160e03 | 790 | { |
fbd35aca | 791 | struct cifsInodeInfo *cinode = CIFS_I(cfile->dentry->d_inode); |
d59dad2b | 792 | mutex_lock(&cinode->lock_mutex); |
f45d3416 | 793 | list_add_tail(&lock->llist, &cfile->llist->locks); |
d59dad2b | 794 | mutex_unlock(&cinode->lock_mutex); |
7ee1af76 JA |
795 | } |
796 | ||
9a5101c8 PS |
797 | /* |
798 | * Set the byte-range lock (mandatory style). Returns: | |
799 | * 1) 0, if we set the lock and don't need to request to the server; | |
800 | * 2) 1, if no locks prevent us but we need to request to the server; | |
801 | * 3) -EACCESS, if there is a lock that prevents us and wait is false. | |
802 | */ | |
85160e03 | 803 | static int |
fbd35aca | 804 | cifs_lock_add_if(struct cifsFileInfo *cfile, struct cifsLockInfo *lock, |
161ebf9f | 805 | bool wait) |
85160e03 | 806 | { |
161ebf9f | 807 | struct cifsLockInfo *conf_lock; |
fbd35aca | 808 | struct cifsInodeInfo *cinode = CIFS_I(cfile->dentry->d_inode); |
85160e03 PS |
809 | bool exist; |
810 | int rc = 0; | |
811 | ||
85160e03 PS |
812 | try_again: |
813 | exist = false; | |
814 | mutex_lock(&cinode->lock_mutex); | |
815 | ||
55157dfb PS |
816 | exist = cifs_find_lock_conflict(cfile, lock->offset, lock->length, |
817 | lock->type, &conf_lock); | |
85160e03 | 818 | if (!exist && cinode->can_cache_brlcks) { |
f45d3416 | 819 | list_add_tail(&lock->llist, &cfile->llist->locks); |
85160e03 PS |
820 | mutex_unlock(&cinode->lock_mutex); |
821 | return rc; | |
822 | } | |
823 | ||
824 | if (!exist) | |
825 | rc = 1; | |
826 | else if (!wait) | |
827 | rc = -EACCES; | |
828 | else { | |
829 | list_add_tail(&lock->blist, &conf_lock->blist); | |
830 | mutex_unlock(&cinode->lock_mutex); | |
831 | rc = wait_event_interruptible(lock->block_q, | |
832 | (lock->blist.prev == &lock->blist) && | |
833 | (lock->blist.next == &lock->blist)); | |
834 | if (!rc) | |
835 | goto try_again; | |
a88b4707 PS |
836 | mutex_lock(&cinode->lock_mutex); |
837 | list_del_init(&lock->blist); | |
85160e03 PS |
838 | } |
839 | ||
85160e03 PS |
840 | mutex_unlock(&cinode->lock_mutex); |
841 | return rc; | |
842 | } | |
843 | ||
9a5101c8 PS |
844 | /* |
845 | * Check if there is another lock that prevents us to set the lock (posix | |
846 | * style). If such a lock exists, update the flock structure with its | |
847 | * properties. Otherwise, set the flock type to F_UNLCK if we can cache brlocks | |
848 | * or leave it the same if we can't. Returns 0 if we don't need to request to | |
849 | * the server or 1 otherwise. | |
850 | */ | |
85160e03 | 851 | static int |
4f6bcec9 PS |
852 | cifs_posix_lock_test(struct file *file, struct file_lock *flock) |
853 | { | |
854 | int rc = 0; | |
855 | struct cifsInodeInfo *cinode = CIFS_I(file->f_path.dentry->d_inode); | |
856 | unsigned char saved_type = flock->fl_type; | |
857 | ||
50792760 PS |
858 | if ((flock->fl_flags & FL_POSIX) == 0) |
859 | return 1; | |
860 | ||
4f6bcec9 PS |
861 | mutex_lock(&cinode->lock_mutex); |
862 | posix_test_lock(file, flock); | |
863 | ||
864 | if (flock->fl_type == F_UNLCK && !cinode->can_cache_brlcks) { | |
865 | flock->fl_type = saved_type; | |
866 | rc = 1; | |
867 | } | |
868 | ||
869 | mutex_unlock(&cinode->lock_mutex); | |
870 | return rc; | |
871 | } | |
872 | ||
9a5101c8 PS |
873 | /* |
874 | * Set the byte-range lock (posix style). Returns: | |
875 | * 1) 0, if we set the lock and don't need to request to the server; | |
876 | * 2) 1, if we need to request to the server; | |
877 | * 3) <0, if the error occurs while setting the lock. | |
878 | */ | |
4f6bcec9 PS |
879 | static int |
880 | cifs_posix_lock_set(struct file *file, struct file_lock *flock) | |
881 | { | |
882 | struct cifsInodeInfo *cinode = CIFS_I(file->f_path.dentry->d_inode); | |
50792760 PS |
883 | int rc = 1; |
884 | ||
885 | if ((flock->fl_flags & FL_POSIX) == 0) | |
886 | return rc; | |
4f6bcec9 | 887 | |
66189be7 | 888 | try_again: |
4f6bcec9 PS |
889 | mutex_lock(&cinode->lock_mutex); |
890 | if (!cinode->can_cache_brlcks) { | |
891 | mutex_unlock(&cinode->lock_mutex); | |
50792760 | 892 | return rc; |
4f6bcec9 | 893 | } |
66189be7 PS |
894 | |
895 | rc = posix_lock_file(file, flock, NULL); | |
9ebb389d | 896 | mutex_unlock(&cinode->lock_mutex); |
66189be7 PS |
897 | if (rc == FILE_LOCK_DEFERRED) { |
898 | rc = wait_event_interruptible(flock->fl_wait, !flock->fl_next); | |
899 | if (!rc) | |
900 | goto try_again; | |
901 | locks_delete_block(flock); | |
902 | } | |
9ebb389d | 903 | return rc; |
4f6bcec9 PS |
904 | } |
905 | ||
906 | static int | |
907 | cifs_push_mandatory_locks(struct cifsFileInfo *cfile) | |
85160e03 | 908 | { |
6d5786a3 PS |
909 | unsigned int xid; |
910 | int rc = 0, stored_rc; | |
85160e03 PS |
911 | struct cifsLockInfo *li, *tmp; |
912 | struct cifs_tcon *tcon; | |
913 | struct cifsInodeInfo *cinode = CIFS_I(cfile->dentry->d_inode); | |
0013fb4c | 914 | unsigned int num, max_num, max_buf; |
32b9aaf1 PS |
915 | LOCKING_ANDX_RANGE *buf, *cur; |
916 | int types[] = {LOCKING_ANDX_LARGE_FILES, | |
917 | LOCKING_ANDX_SHARED_LOCK | LOCKING_ANDX_LARGE_FILES}; | |
918 | int i; | |
85160e03 | 919 | |
6d5786a3 | 920 | xid = get_xid(); |
85160e03 PS |
921 | tcon = tlink_tcon(cfile->tlink); |
922 | ||
923 | mutex_lock(&cinode->lock_mutex); | |
924 | if (!cinode->can_cache_brlcks) { | |
925 | mutex_unlock(&cinode->lock_mutex); | |
6d5786a3 | 926 | free_xid(xid); |
85160e03 PS |
927 | return rc; |
928 | } | |
929 | ||
0013fb4c PS |
930 | /* |
931 | * Accessing maxBuf is racy with cifs_reconnect - need to store value | |
932 | * and check it for zero before using. | |
933 | */ | |
934 | max_buf = tcon->ses->server->maxBuf; | |
935 | if (!max_buf) { | |
936 | mutex_unlock(&cinode->lock_mutex); | |
6d5786a3 | 937 | free_xid(xid); |
0013fb4c PS |
938 | return -EINVAL; |
939 | } | |
940 | ||
941 | max_num = (max_buf - sizeof(struct smb_hdr)) / | |
942 | sizeof(LOCKING_ANDX_RANGE); | |
32b9aaf1 PS |
943 | buf = kzalloc(max_num * sizeof(LOCKING_ANDX_RANGE), GFP_KERNEL); |
944 | if (!buf) { | |
945 | mutex_unlock(&cinode->lock_mutex); | |
6d5786a3 | 946 | free_xid(xid); |
e2f2886a | 947 | return -ENOMEM; |
32b9aaf1 PS |
948 | } |
949 | ||
950 | for (i = 0; i < 2; i++) { | |
951 | cur = buf; | |
952 | num = 0; | |
f45d3416 | 953 | list_for_each_entry_safe(li, tmp, &cfile->llist->locks, llist) { |
32b9aaf1 PS |
954 | if (li->type != types[i]) |
955 | continue; | |
956 | cur->Pid = cpu_to_le16(li->pid); | |
957 | cur->LengthLow = cpu_to_le32((u32)li->length); | |
958 | cur->LengthHigh = cpu_to_le32((u32)(li->length>>32)); | |
959 | cur->OffsetLow = cpu_to_le32((u32)li->offset); | |
960 | cur->OffsetHigh = cpu_to_le32((u32)(li->offset>>32)); | |
961 | if (++num == max_num) { | |
4b4de76e PS |
962 | stored_rc = cifs_lockv(xid, tcon, |
963 | cfile->fid.netfid, | |
04a6aa8a PS |
964 | (__u8)li->type, 0, num, |
965 | buf); | |
32b9aaf1 PS |
966 | if (stored_rc) |
967 | rc = stored_rc; | |
968 | cur = buf; | |
969 | num = 0; | |
970 | } else | |
971 | cur++; | |
972 | } | |
973 | ||
974 | if (num) { | |
4b4de76e | 975 | stored_rc = cifs_lockv(xid, tcon, cfile->fid.netfid, |
04a6aa8a | 976 | (__u8)types[i], 0, num, buf); |
32b9aaf1 PS |
977 | if (stored_rc) |
978 | rc = stored_rc; | |
979 | } | |
85160e03 PS |
980 | } |
981 | ||
982 | cinode->can_cache_brlcks = false; | |
983 | mutex_unlock(&cinode->lock_mutex); | |
984 | ||
32b9aaf1 | 985 | kfree(buf); |
6d5786a3 | 986 | free_xid(xid); |
85160e03 PS |
987 | return rc; |
988 | } | |
989 | ||
4f6bcec9 PS |
990 | /* copied from fs/locks.c with a name change */ |
991 | #define cifs_for_each_lock(inode, lockp) \ | |
992 | for (lockp = &inode->i_flock; *lockp != NULL; \ | |
993 | lockp = &(*lockp)->fl_next) | |
994 | ||
d5751469 PS |
995 | struct lock_to_push { |
996 | struct list_head llist; | |
997 | __u64 offset; | |
998 | __u64 length; | |
999 | __u32 pid; | |
1000 | __u16 netfid; | |
1001 | __u8 type; | |
1002 | }; | |
1003 | ||
4f6bcec9 PS |
1004 | static int |
1005 | cifs_push_posix_locks(struct cifsFileInfo *cfile) | |
1006 | { | |
1007 | struct cifsInodeInfo *cinode = CIFS_I(cfile->dentry->d_inode); | |
1008 | struct cifs_tcon *tcon = tlink_tcon(cfile->tlink); | |
1009 | struct file_lock *flock, **before; | |
d5751469 | 1010 | unsigned int count = 0, i = 0; |
4f6bcec9 | 1011 | int rc = 0, xid, type; |
d5751469 PS |
1012 | struct list_head locks_to_send, *el; |
1013 | struct lock_to_push *lck, *tmp; | |
4f6bcec9 | 1014 | __u64 length; |
4f6bcec9 | 1015 | |
6d5786a3 | 1016 | xid = get_xid(); |
4f6bcec9 PS |
1017 | |
1018 | mutex_lock(&cinode->lock_mutex); | |
1019 | if (!cinode->can_cache_brlcks) { | |
1020 | mutex_unlock(&cinode->lock_mutex); | |
6d5786a3 | 1021 | free_xid(xid); |
4f6bcec9 PS |
1022 | return rc; |
1023 | } | |
1024 | ||
d5751469 PS |
1025 | lock_flocks(); |
1026 | cifs_for_each_lock(cfile->dentry->d_inode, before) { | |
1027 | if ((*before)->fl_flags & FL_POSIX) | |
1028 | count++; | |
1029 | } | |
1030 | unlock_flocks(); | |
1031 | ||
4f6bcec9 PS |
1032 | INIT_LIST_HEAD(&locks_to_send); |
1033 | ||
d5751469 | 1034 | /* |
ce85852b PS |
1035 | * Allocating count locks is enough because no FL_POSIX locks can be |
1036 | * added to the list while we are holding cinode->lock_mutex that | |
1037 | * protects locking operations of this inode. | |
d5751469 PS |
1038 | */ |
1039 | for (; i < count; i++) { | |
1040 | lck = kmalloc(sizeof(struct lock_to_push), GFP_KERNEL); | |
1041 | if (!lck) { | |
1042 | rc = -ENOMEM; | |
1043 | goto err_out; | |
1044 | } | |
1045 | list_add_tail(&lck->llist, &locks_to_send); | |
1046 | } | |
1047 | ||
d5751469 | 1048 | el = locks_to_send.next; |
4f6bcec9 PS |
1049 | lock_flocks(); |
1050 | cifs_for_each_lock(cfile->dentry->d_inode, before) { | |
ce85852b PS |
1051 | flock = *before; |
1052 | if ((flock->fl_flags & FL_POSIX) == 0) | |
1053 | continue; | |
d5751469 | 1054 | if (el == &locks_to_send) { |
ce85852b PS |
1055 | /* |
1056 | * The list ended. We don't have enough allocated | |
1057 | * structures - something is really wrong. | |
1058 | */ | |
d5751469 PS |
1059 | cERROR(1, "Can't push all brlocks!"); |
1060 | break; | |
1061 | } | |
4f6bcec9 PS |
1062 | length = 1 + flock->fl_end - flock->fl_start; |
1063 | if (flock->fl_type == F_RDLCK || flock->fl_type == F_SHLCK) | |
1064 | type = CIFS_RDLCK; | |
1065 | else | |
1066 | type = CIFS_WRLCK; | |
d5751469 | 1067 | lck = list_entry(el, struct lock_to_push, llist); |
4f6bcec9 | 1068 | lck->pid = flock->fl_pid; |
4b4de76e | 1069 | lck->netfid = cfile->fid.netfid; |
d5751469 PS |
1070 | lck->length = length; |
1071 | lck->type = type; | |
1072 | lck->offset = flock->fl_start; | |
d5751469 | 1073 | el = el->next; |
4f6bcec9 | 1074 | } |
4f6bcec9 PS |
1075 | unlock_flocks(); |
1076 | ||
1077 | list_for_each_entry_safe(lck, tmp, &locks_to_send, llist) { | |
4f6bcec9 PS |
1078 | int stored_rc; |
1079 | ||
4f6bcec9 | 1080 | stored_rc = CIFSSMBPosixLock(xid, tcon, lck->netfid, lck->pid, |
c5fd363d | 1081 | lck->offset, lck->length, NULL, |
4f6bcec9 PS |
1082 | lck->type, 0); |
1083 | if (stored_rc) | |
1084 | rc = stored_rc; | |
1085 | list_del(&lck->llist); | |
1086 | kfree(lck); | |
1087 | } | |
1088 | ||
d5751469 | 1089 | out: |
4f6bcec9 PS |
1090 | cinode->can_cache_brlcks = false; |
1091 | mutex_unlock(&cinode->lock_mutex); | |
1092 | ||
6d5786a3 | 1093 | free_xid(xid); |
4f6bcec9 | 1094 | return rc; |
d5751469 PS |
1095 | err_out: |
1096 | list_for_each_entry_safe(lck, tmp, &locks_to_send, llist) { | |
1097 | list_del(&lck->llist); | |
1098 | kfree(lck); | |
1099 | } | |
1100 | goto out; | |
4f6bcec9 PS |
1101 | } |
1102 | ||
1103 | static int | |
1104 | cifs_push_locks(struct cifsFileInfo *cfile) | |
1105 | { | |
1106 | struct cifs_sb_info *cifs_sb = CIFS_SB(cfile->dentry->d_sb); | |
1107 | struct cifs_tcon *tcon = tlink_tcon(cfile->tlink); | |
1108 | ||
29e20f9c | 1109 | if (cap_unix(tcon->ses) && |
4f6bcec9 PS |
1110 | (CIFS_UNIX_FCNTL_CAP & le64_to_cpu(tcon->fsUnixInfo.Capability)) && |
1111 | ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NOPOSIXBRL) == 0)) | |
1112 | return cifs_push_posix_locks(cfile); | |
1113 | ||
1114 | return cifs_push_mandatory_locks(cfile); | |
1115 | } | |
1116 | ||
03776f45 | 1117 | static void |
04a6aa8a | 1118 | cifs_read_flock(struct file_lock *flock, __u32 *type, int *lock, int *unlock, |
106dc538 | 1119 | bool *wait_flag, struct TCP_Server_Info *server) |
1da177e4 | 1120 | { |
03776f45 | 1121 | if (flock->fl_flags & FL_POSIX) |
b6b38f70 | 1122 | cFYI(1, "Posix"); |
03776f45 | 1123 | if (flock->fl_flags & FL_FLOCK) |
b6b38f70 | 1124 | cFYI(1, "Flock"); |
03776f45 | 1125 | if (flock->fl_flags & FL_SLEEP) { |
b6b38f70 | 1126 | cFYI(1, "Blocking lock"); |
03776f45 | 1127 | *wait_flag = true; |
1da177e4 | 1128 | } |
03776f45 | 1129 | if (flock->fl_flags & FL_ACCESS) |
b6b38f70 | 1130 | cFYI(1, "Process suspended by mandatory locking - " |
03776f45 PS |
1131 | "not implemented yet"); |
1132 | if (flock->fl_flags & FL_LEASE) | |
b6b38f70 | 1133 | cFYI(1, "Lease on file - not implemented yet"); |
03776f45 | 1134 | if (flock->fl_flags & |
1da177e4 | 1135 | (~(FL_POSIX | FL_FLOCK | FL_SLEEP | FL_ACCESS | FL_LEASE))) |
03776f45 | 1136 | cFYI(1, "Unknown lock flags 0x%x", flock->fl_flags); |
1da177e4 | 1137 | |
106dc538 | 1138 | *type = server->vals->large_lock_type; |
03776f45 | 1139 | if (flock->fl_type == F_WRLCK) { |
b6b38f70 | 1140 | cFYI(1, "F_WRLCK "); |
106dc538 | 1141 | *type |= server->vals->exclusive_lock_type; |
03776f45 PS |
1142 | *lock = 1; |
1143 | } else if (flock->fl_type == F_UNLCK) { | |
b6b38f70 | 1144 | cFYI(1, "F_UNLCK"); |
106dc538 | 1145 | *type |= server->vals->unlock_lock_type; |
03776f45 PS |
1146 | *unlock = 1; |
1147 | /* Check if unlock includes more than one lock range */ | |
1148 | } else if (flock->fl_type == F_RDLCK) { | |
b6b38f70 | 1149 | cFYI(1, "F_RDLCK"); |
106dc538 | 1150 | *type |= server->vals->shared_lock_type; |
03776f45 PS |
1151 | *lock = 1; |
1152 | } else if (flock->fl_type == F_EXLCK) { | |
b6b38f70 | 1153 | cFYI(1, "F_EXLCK"); |
106dc538 | 1154 | *type |= server->vals->exclusive_lock_type; |
03776f45 PS |
1155 | *lock = 1; |
1156 | } else if (flock->fl_type == F_SHLCK) { | |
b6b38f70 | 1157 | cFYI(1, "F_SHLCK"); |
106dc538 | 1158 | *type |= server->vals->shared_lock_type; |
03776f45 | 1159 | *lock = 1; |
1da177e4 | 1160 | } else |
b6b38f70 | 1161 | cFYI(1, "Unknown type of lock"); |
03776f45 | 1162 | } |
1da177e4 | 1163 | |
55157dfb | 1164 | static int |
6d5786a3 | 1165 | cifs_mandatory_lock(unsigned int xid, struct cifsFileInfo *cfile, __u64 offset, |
55157dfb PS |
1166 | __u64 length, __u32 type, int lock, int unlock, bool wait) |
1167 | { | |
4b4de76e | 1168 | return CIFSSMBLock(xid, tlink_tcon(cfile->tlink), cfile->fid.netfid, |
55157dfb PS |
1169 | current->tgid, length, offset, unlock, lock, |
1170 | (__u8)type, wait, 0); | |
1171 | } | |
1172 | ||
03776f45 | 1173 | static int |
04a6aa8a | 1174 | cifs_getlk(struct file *file, struct file_lock *flock, __u32 type, |
6d5786a3 | 1175 | bool wait_flag, bool posix_lck, unsigned int xid) |
03776f45 PS |
1176 | { |
1177 | int rc = 0; | |
1178 | __u64 length = 1 + flock->fl_end - flock->fl_start; | |
4f6bcec9 PS |
1179 | struct cifsFileInfo *cfile = (struct cifsFileInfo *)file->private_data; |
1180 | struct cifs_tcon *tcon = tlink_tcon(cfile->tlink); | |
106dc538 | 1181 | struct TCP_Server_Info *server = tcon->ses->server; |
4b4de76e | 1182 | __u16 netfid = cfile->fid.netfid; |
f05337c6 | 1183 | |
03776f45 PS |
1184 | if (posix_lck) { |
1185 | int posix_lock_type; | |
4f6bcec9 PS |
1186 | |
1187 | rc = cifs_posix_lock_test(file, flock); | |
1188 | if (!rc) | |
1189 | return rc; | |
1190 | ||
106dc538 | 1191 | if (type & server->vals->shared_lock_type) |
03776f45 PS |
1192 | posix_lock_type = CIFS_RDLCK; |
1193 | else | |
1194 | posix_lock_type = CIFS_WRLCK; | |
4f6bcec9 | 1195 | rc = CIFSSMBPosixLock(xid, tcon, netfid, current->tgid, |
c5fd363d | 1196 | flock->fl_start, length, flock, |
4f6bcec9 | 1197 | posix_lock_type, wait_flag); |
03776f45 PS |
1198 | return rc; |
1199 | } | |
1da177e4 | 1200 | |
fbd35aca | 1201 | rc = cifs_lock_test(cfile, flock->fl_start, length, type, flock); |
85160e03 PS |
1202 | if (!rc) |
1203 | return rc; | |
1204 | ||
03776f45 | 1205 | /* BB we could chain these into one lock request BB */ |
55157dfb PS |
1206 | rc = cifs_mandatory_lock(xid, cfile, flock->fl_start, length, type, |
1207 | 1, 0, false); | |
03776f45 | 1208 | if (rc == 0) { |
55157dfb PS |
1209 | rc = cifs_mandatory_lock(xid, cfile, flock->fl_start, length, |
1210 | type, 0, 1, false); | |
03776f45 PS |
1211 | flock->fl_type = F_UNLCK; |
1212 | if (rc != 0) | |
1213 | cERROR(1, "Error unlocking previously locked " | |
106dc538 | 1214 | "range %d during test of lock", rc); |
a88b4707 | 1215 | return 0; |
1da177e4 | 1216 | } |
7ee1af76 | 1217 | |
106dc538 | 1218 | if (type & server->vals->shared_lock_type) { |
03776f45 | 1219 | flock->fl_type = F_WRLCK; |
a88b4707 | 1220 | return 0; |
7ee1af76 JA |
1221 | } |
1222 | ||
55157dfb PS |
1223 | rc = cifs_mandatory_lock(xid, cfile, flock->fl_start, length, |
1224 | type | server->vals->shared_lock_type, 1, 0, | |
1225 | false); | |
03776f45 | 1226 | if (rc == 0) { |
55157dfb PS |
1227 | rc = cifs_mandatory_lock(xid, cfile, flock->fl_start, length, |
1228 | type | server->vals->shared_lock_type, | |
1229 | 0, 1, false); | |
03776f45 PS |
1230 | flock->fl_type = F_RDLCK; |
1231 | if (rc != 0) | |
1232 | cERROR(1, "Error unlocking previously locked " | |
1233 | "range %d during test of lock", rc); | |
1234 | } else | |
1235 | flock->fl_type = F_WRLCK; | |
1236 | ||
a88b4707 | 1237 | return 0; |
03776f45 PS |
1238 | } |
1239 | ||
9ee305b7 PS |
1240 | static void |
1241 | cifs_move_llist(struct list_head *source, struct list_head *dest) | |
1242 | { | |
1243 | struct list_head *li, *tmp; | |
1244 | list_for_each_safe(li, tmp, source) | |
1245 | list_move(li, dest); | |
1246 | } | |
1247 | ||
1248 | static void | |
1249 | cifs_free_llist(struct list_head *llist) | |
1250 | { | |
1251 | struct cifsLockInfo *li, *tmp; | |
1252 | list_for_each_entry_safe(li, tmp, llist, llist) { | |
1253 | cifs_del_lock_waiters(li); | |
1254 | list_del(&li->llist); | |
1255 | kfree(li); | |
1256 | } | |
1257 | } | |
1258 | ||
1259 | static int | |
6d5786a3 PS |
1260 | cifs_unlock_range(struct cifsFileInfo *cfile, struct file_lock *flock, |
1261 | unsigned int xid) | |
9ee305b7 PS |
1262 | { |
1263 | int rc = 0, stored_rc; | |
1264 | int types[] = {LOCKING_ANDX_LARGE_FILES, | |
1265 | LOCKING_ANDX_SHARED_LOCK | LOCKING_ANDX_LARGE_FILES}; | |
1266 | unsigned int i; | |
0013fb4c | 1267 | unsigned int max_num, num, max_buf; |
9ee305b7 PS |
1268 | LOCKING_ANDX_RANGE *buf, *cur; |
1269 | struct cifs_tcon *tcon = tlink_tcon(cfile->tlink); | |
1270 | struct cifsInodeInfo *cinode = CIFS_I(cfile->dentry->d_inode); | |
1271 | struct cifsLockInfo *li, *tmp; | |
1272 | __u64 length = 1 + flock->fl_end - flock->fl_start; | |
1273 | struct list_head tmp_llist; | |
1274 | ||
1275 | INIT_LIST_HEAD(&tmp_llist); | |
1276 | ||
0013fb4c PS |
1277 | /* |
1278 | * Accessing maxBuf is racy with cifs_reconnect - need to store value | |
1279 | * and check it for zero before using. | |
1280 | */ | |
1281 | max_buf = tcon->ses->server->maxBuf; | |
1282 | if (!max_buf) | |
1283 | return -EINVAL; | |
1284 | ||
1285 | max_num = (max_buf - sizeof(struct smb_hdr)) / | |
1286 | sizeof(LOCKING_ANDX_RANGE); | |
9ee305b7 PS |
1287 | buf = kzalloc(max_num * sizeof(LOCKING_ANDX_RANGE), GFP_KERNEL); |
1288 | if (!buf) | |
1289 | return -ENOMEM; | |
1290 | ||
1291 | mutex_lock(&cinode->lock_mutex); | |
1292 | for (i = 0; i < 2; i++) { | |
1293 | cur = buf; | |
1294 | num = 0; | |
f45d3416 | 1295 | list_for_each_entry_safe(li, tmp, &cfile->llist->locks, llist) { |
9ee305b7 PS |
1296 | if (flock->fl_start > li->offset || |
1297 | (flock->fl_start + length) < | |
1298 | (li->offset + li->length)) | |
1299 | continue; | |
1300 | if (current->tgid != li->pid) | |
1301 | continue; | |
9ee305b7 PS |
1302 | if (types[i] != li->type) |
1303 | continue; | |
ea319d57 | 1304 | if (cinode->can_cache_brlcks) { |
9ee305b7 PS |
1305 | /* |
1306 | * We can cache brlock requests - simply remove | |
fbd35aca | 1307 | * a lock from the file's list. |
9ee305b7 PS |
1308 | */ |
1309 | list_del(&li->llist); | |
1310 | cifs_del_lock_waiters(li); | |
1311 | kfree(li); | |
ea319d57 | 1312 | continue; |
9ee305b7 | 1313 | } |
ea319d57 PS |
1314 | cur->Pid = cpu_to_le16(li->pid); |
1315 | cur->LengthLow = cpu_to_le32((u32)li->length); | |
1316 | cur->LengthHigh = cpu_to_le32((u32)(li->length>>32)); | |
1317 | cur->OffsetLow = cpu_to_le32((u32)li->offset); | |
1318 | cur->OffsetHigh = cpu_to_le32((u32)(li->offset>>32)); | |
1319 | /* | |
1320 | * We need to save a lock here to let us add it again to | |
1321 | * the file's list if the unlock range request fails on | |
1322 | * the server. | |
1323 | */ | |
1324 | list_move(&li->llist, &tmp_llist); | |
1325 | if (++num == max_num) { | |
4b4de76e PS |
1326 | stored_rc = cifs_lockv(xid, tcon, |
1327 | cfile->fid.netfid, | |
ea319d57 PS |
1328 | li->type, num, 0, buf); |
1329 | if (stored_rc) { | |
1330 | /* | |
1331 | * We failed on the unlock range | |
1332 | * request - add all locks from the tmp | |
1333 | * list to the head of the file's list. | |
1334 | */ | |
1335 | cifs_move_llist(&tmp_llist, | |
f45d3416 | 1336 | &cfile->llist->locks); |
ea319d57 PS |
1337 | rc = stored_rc; |
1338 | } else | |
1339 | /* | |
1340 | * The unlock range request succeed - | |
1341 | * free the tmp list. | |
1342 | */ | |
1343 | cifs_free_llist(&tmp_llist); | |
1344 | cur = buf; | |
1345 | num = 0; | |
1346 | } else | |
1347 | cur++; | |
9ee305b7 PS |
1348 | } |
1349 | if (num) { | |
4b4de76e | 1350 | stored_rc = cifs_lockv(xid, tcon, cfile->fid.netfid, |
9ee305b7 PS |
1351 | types[i], num, 0, buf); |
1352 | if (stored_rc) { | |
f45d3416 PS |
1353 | cifs_move_llist(&tmp_llist, |
1354 | &cfile->llist->locks); | |
9ee305b7 PS |
1355 | rc = stored_rc; |
1356 | } else | |
1357 | cifs_free_llist(&tmp_llist); | |
1358 | } | |
1359 | } | |
1360 | ||
1361 | mutex_unlock(&cinode->lock_mutex); | |
1362 | kfree(buf); | |
1363 | return rc; | |
1364 | } | |
1365 | ||
03776f45 | 1366 | static int |
f45d3416 | 1367 | cifs_setlk(struct file *file, struct file_lock *flock, __u32 type, |
6d5786a3 PS |
1368 | bool wait_flag, bool posix_lck, int lock, int unlock, |
1369 | unsigned int xid) | |
03776f45 PS |
1370 | { |
1371 | int rc = 0; | |
1372 | __u64 length = 1 + flock->fl_end - flock->fl_start; | |
1373 | struct cifsFileInfo *cfile = (struct cifsFileInfo *)file->private_data; | |
1374 | struct cifs_tcon *tcon = tlink_tcon(cfile->tlink); | |
106dc538 | 1375 | struct TCP_Server_Info *server = tcon->ses->server; |
03776f45 PS |
1376 | |
1377 | if (posix_lck) { | |
08547b03 | 1378 | int posix_lock_type; |
4f6bcec9 PS |
1379 | |
1380 | rc = cifs_posix_lock_set(file, flock); | |
1381 | if (!rc || rc < 0) | |
1382 | return rc; | |
1383 | ||
106dc538 | 1384 | if (type & server->vals->shared_lock_type) |
08547b03 SF |
1385 | posix_lock_type = CIFS_RDLCK; |
1386 | else | |
1387 | posix_lock_type = CIFS_WRLCK; | |
50c2f753 | 1388 | |
03776f45 | 1389 | if (unlock == 1) |
beb84dc8 | 1390 | posix_lock_type = CIFS_UNLCK; |
7ee1af76 | 1391 | |
f45d3416 PS |
1392 | rc = CIFSSMBPosixLock(xid, tcon, cfile->fid.netfid, |
1393 | current->tgid, flock->fl_start, length, | |
1394 | NULL, posix_lock_type, wait_flag); | |
03776f45 PS |
1395 | goto out; |
1396 | } | |
7ee1af76 | 1397 | |
03776f45 | 1398 | if (lock) { |
161ebf9f PS |
1399 | struct cifsLockInfo *lock; |
1400 | ||
fbd35aca | 1401 | lock = cifs_lock_init(flock->fl_start, length, type); |
161ebf9f PS |
1402 | if (!lock) |
1403 | return -ENOMEM; | |
1404 | ||
fbd35aca | 1405 | rc = cifs_lock_add_if(cfile, lock, wait_flag); |
85160e03 | 1406 | if (rc < 0) |
161ebf9f PS |
1407 | kfree(lock); |
1408 | if (rc <= 0) | |
85160e03 PS |
1409 | goto out; |
1410 | ||
7f92447a PS |
1411 | rc = cifs_mandatory_lock(xid, cfile, flock->fl_start, length, |
1412 | type, 1, 0, wait_flag); | |
161ebf9f PS |
1413 | if (rc) { |
1414 | kfree(lock); | |
1415 | goto out; | |
03776f45 | 1416 | } |
161ebf9f | 1417 | |
fbd35aca | 1418 | cifs_lock_add(cfile, lock); |
9ee305b7 PS |
1419 | } else if (unlock) |
1420 | rc = cifs_unlock_range(cfile, flock, xid); | |
03776f45 | 1421 | |
03776f45 PS |
1422 | out: |
1423 | if (flock->fl_flags & FL_POSIX) | |
9ebb389d | 1424 | posix_lock_file_wait(file, flock); |
03776f45 PS |
1425 | return rc; |
1426 | } | |
1427 | ||
1428 | int cifs_lock(struct file *file, int cmd, struct file_lock *flock) | |
1429 | { | |
1430 | int rc, xid; | |
1431 | int lock = 0, unlock = 0; | |
1432 | bool wait_flag = false; | |
1433 | bool posix_lck = false; | |
1434 | struct cifs_sb_info *cifs_sb; | |
1435 | struct cifs_tcon *tcon; | |
1436 | struct cifsInodeInfo *cinode; | |
1437 | struct cifsFileInfo *cfile; | |
1438 | __u16 netfid; | |
04a6aa8a | 1439 | __u32 type; |
03776f45 PS |
1440 | |
1441 | rc = -EACCES; | |
6d5786a3 | 1442 | xid = get_xid(); |
03776f45 PS |
1443 | |
1444 | cFYI(1, "Lock parm: 0x%x flockflags: 0x%x flocktype: 0x%x start: %lld " | |
1445 | "end: %lld", cmd, flock->fl_flags, flock->fl_type, | |
1446 | flock->fl_start, flock->fl_end); | |
1447 | ||
03776f45 PS |
1448 | cfile = (struct cifsFileInfo *)file->private_data; |
1449 | tcon = tlink_tcon(cfile->tlink); | |
106dc538 PS |
1450 | |
1451 | cifs_read_flock(flock, &type, &lock, &unlock, &wait_flag, | |
1452 | tcon->ses->server); | |
1453 | ||
1454 | cifs_sb = CIFS_SB(file->f_path.dentry->d_sb); | |
4b4de76e | 1455 | netfid = cfile->fid.netfid; |
03776f45 PS |
1456 | cinode = CIFS_I(file->f_path.dentry->d_inode); |
1457 | ||
29e20f9c | 1458 | if (cap_unix(tcon->ses) && |
03776f45 PS |
1459 | (CIFS_UNIX_FCNTL_CAP & le64_to_cpu(tcon->fsUnixInfo.Capability)) && |
1460 | ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NOPOSIXBRL) == 0)) | |
1461 | posix_lck = true; | |
1462 | /* | |
1463 | * BB add code here to normalize offset and length to account for | |
1464 | * negative length which we can not accept over the wire. | |
1465 | */ | |
1466 | if (IS_GETLK(cmd)) { | |
4f6bcec9 | 1467 | rc = cifs_getlk(file, flock, type, wait_flag, posix_lck, xid); |
6d5786a3 | 1468 | free_xid(xid); |
03776f45 PS |
1469 | return rc; |
1470 | } | |
1471 | ||
1472 | if (!lock && !unlock) { | |
1473 | /* | |
1474 | * if no lock or unlock then nothing to do since we do not | |
1475 | * know what it is | |
1476 | */ | |
6d5786a3 | 1477 | free_xid(xid); |
03776f45 | 1478 | return -EOPNOTSUPP; |
7ee1af76 JA |
1479 | } |
1480 | ||
03776f45 PS |
1481 | rc = cifs_setlk(file, flock, type, wait_flag, posix_lck, lock, unlock, |
1482 | xid); | |
6d5786a3 | 1483 | free_xid(xid); |
1da177e4 LT |
1484 | return rc; |
1485 | } | |
1486 | ||
597b027f JL |
1487 | /* |
1488 | * update the file size (if needed) after a write. Should be called with | |
1489 | * the inode->i_lock held | |
1490 | */ | |
72432ffc | 1491 | void |
fbec9ab9 JL |
1492 | cifs_update_eof(struct cifsInodeInfo *cifsi, loff_t offset, |
1493 | unsigned int bytes_written) | |
1494 | { | |
1495 | loff_t end_of_write = offset + bytes_written; | |
1496 | ||
1497 | if (end_of_write > cifsi->server_eof) | |
1498 | cifsi->server_eof = end_of_write; | |
1499 | } | |
1500 | ||
ba9ad725 PS |
1501 | static ssize_t |
1502 | cifs_write(struct cifsFileInfo *open_file, __u32 pid, const char *write_data, | |
1503 | size_t write_size, loff_t *offset) | |
1da177e4 LT |
1504 | { |
1505 | int rc = 0; | |
1506 | unsigned int bytes_written = 0; | |
1507 | unsigned int total_written; | |
1508 | struct cifs_sb_info *cifs_sb; | |
ba9ad725 PS |
1509 | struct cifs_tcon *tcon; |
1510 | struct TCP_Server_Info *server; | |
6d5786a3 | 1511 | unsigned int xid; |
7da4b49a JL |
1512 | struct dentry *dentry = open_file->dentry; |
1513 | struct cifsInodeInfo *cifsi = CIFS_I(dentry->d_inode); | |
fa2989f4 | 1514 | struct cifs_io_parms io_parms; |
1da177e4 | 1515 | |
7da4b49a | 1516 | cifs_sb = CIFS_SB(dentry->d_sb); |
1da177e4 | 1517 | |
b6b38f70 | 1518 | cFYI(1, "write %zd bytes to offset %lld of %s", write_size, |
ba9ad725 | 1519 | *offset, dentry->d_name.name); |
1da177e4 | 1520 | |
ba9ad725 PS |
1521 | tcon = tlink_tcon(open_file->tlink); |
1522 | server = tcon->ses->server; | |
1523 | ||
1524 | if (!server->ops->sync_write) | |
1525 | return -ENOSYS; | |
50c2f753 | 1526 | |
6d5786a3 | 1527 | xid = get_xid(); |
1da177e4 | 1528 | |
1da177e4 LT |
1529 | for (total_written = 0; write_size > total_written; |
1530 | total_written += bytes_written) { | |
1531 | rc = -EAGAIN; | |
1532 | while (rc == -EAGAIN) { | |
ca83ce3d JL |
1533 | struct kvec iov[2]; |
1534 | unsigned int len; | |
1535 | ||
1da177e4 | 1536 | if (open_file->invalidHandle) { |
1da177e4 LT |
1537 | /* we could deadlock if we called |
1538 | filemap_fdatawait from here so tell | |
fb8c4b14 | 1539 | reopen_file not to flush data to |
1da177e4 | 1540 | server now */ |
15886177 | 1541 | rc = cifs_reopen_file(open_file, false); |
1da177e4 LT |
1542 | if (rc != 0) |
1543 | break; | |
1544 | } | |
ca83ce3d JL |
1545 | |
1546 | len = min((size_t)cifs_sb->wsize, | |
1547 | write_size - total_written); | |
1548 | /* iov[0] is reserved for smb header */ | |
1549 | iov[1].iov_base = (char *)write_data + total_written; | |
1550 | iov[1].iov_len = len; | |
fa2989f4 | 1551 | io_parms.pid = pid; |
ba9ad725 PS |
1552 | io_parms.tcon = tcon; |
1553 | io_parms.offset = *offset; | |
fa2989f4 | 1554 | io_parms.length = len; |
ba9ad725 PS |
1555 | rc = server->ops->sync_write(xid, open_file, &io_parms, |
1556 | &bytes_written, iov, 1); | |
1da177e4 LT |
1557 | } |
1558 | if (rc || (bytes_written == 0)) { | |
1559 | if (total_written) | |
1560 | break; | |
1561 | else { | |
6d5786a3 | 1562 | free_xid(xid); |
1da177e4 LT |
1563 | return rc; |
1564 | } | |
fbec9ab9 | 1565 | } else { |
597b027f | 1566 | spin_lock(&dentry->d_inode->i_lock); |
ba9ad725 | 1567 | cifs_update_eof(cifsi, *offset, bytes_written); |
597b027f | 1568 | spin_unlock(&dentry->d_inode->i_lock); |
ba9ad725 | 1569 | *offset += bytes_written; |
fbec9ab9 | 1570 | } |
1da177e4 LT |
1571 | } |
1572 | ||
ba9ad725 | 1573 | cifs_stats_bytes_written(tcon, total_written); |
1da177e4 | 1574 | |
7da4b49a JL |
1575 | if (total_written > 0) { |
1576 | spin_lock(&dentry->d_inode->i_lock); | |
ba9ad725 PS |
1577 | if (*offset > dentry->d_inode->i_size) |
1578 | i_size_write(dentry->d_inode, *offset); | |
7da4b49a | 1579 | spin_unlock(&dentry->d_inode->i_lock); |
1da177e4 | 1580 | } |
7da4b49a | 1581 | mark_inode_dirty_sync(dentry->d_inode); |
6d5786a3 | 1582 | free_xid(xid); |
1da177e4 LT |
1583 | return total_written; |
1584 | } | |
1585 | ||
6508d904 JL |
1586 | struct cifsFileInfo *find_readable_file(struct cifsInodeInfo *cifs_inode, |
1587 | bool fsuid_only) | |
630f3f0c SF |
1588 | { |
1589 | struct cifsFileInfo *open_file = NULL; | |
6508d904 JL |
1590 | struct cifs_sb_info *cifs_sb = CIFS_SB(cifs_inode->vfs_inode.i_sb); |
1591 | ||
1592 | /* only filter by fsuid on multiuser mounts */ | |
1593 | if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MULTIUSER)) | |
1594 | fsuid_only = false; | |
630f3f0c | 1595 | |
4477288a | 1596 | spin_lock(&cifs_file_list_lock); |
630f3f0c SF |
1597 | /* we could simply get the first_list_entry since write-only entries |
1598 | are always at the end of the list but since the first entry might | |
1599 | have a close pending, we go through the whole list */ | |
1600 | list_for_each_entry(open_file, &cifs_inode->openFileList, flist) { | |
6508d904 JL |
1601 | if (fsuid_only && open_file->uid != current_fsuid()) |
1602 | continue; | |
2e396b83 | 1603 | if (OPEN_FMODE(open_file->f_flags) & FMODE_READ) { |
630f3f0c SF |
1604 | if (!open_file->invalidHandle) { |
1605 | /* found a good file */ | |
1606 | /* lock it so it will not be closed on us */ | |
764a1b1a | 1607 | cifsFileInfo_get_locked(open_file); |
4477288a | 1608 | spin_unlock(&cifs_file_list_lock); |
630f3f0c SF |
1609 | return open_file; |
1610 | } /* else might as well continue, and look for | |
1611 | another, or simply have the caller reopen it | |
1612 | again rather than trying to fix this handle */ | |
1613 | } else /* write only file */ | |
1614 | break; /* write only files are last so must be done */ | |
1615 | } | |
4477288a | 1616 | spin_unlock(&cifs_file_list_lock); |
630f3f0c SF |
1617 | return NULL; |
1618 | } | |
630f3f0c | 1619 | |
6508d904 JL |
1620 | struct cifsFileInfo *find_writable_file(struct cifsInodeInfo *cifs_inode, |
1621 | bool fsuid_only) | |
6148a742 | 1622 | { |
2c0c2a08 | 1623 | struct cifsFileInfo *open_file, *inv_file = NULL; |
d3892294 | 1624 | struct cifs_sb_info *cifs_sb; |
2846d386 | 1625 | bool any_available = false; |
dd99cd80 | 1626 | int rc; |
2c0c2a08 | 1627 | unsigned int refind = 0; |
6148a742 | 1628 | |
60808233 SF |
1629 | /* Having a null inode here (because mapping->host was set to zero by |
1630 | the VFS or MM) should not happen but we had reports of on oops (due to | |
1631 | it being zero) during stress testcases so we need to check for it */ | |
1632 | ||
fb8c4b14 | 1633 | if (cifs_inode == NULL) { |
b6b38f70 | 1634 | cERROR(1, "Null inode passed to cifs_writeable_file"); |
60808233 SF |
1635 | dump_stack(); |
1636 | return NULL; | |
1637 | } | |
1638 | ||
d3892294 JL |
1639 | cifs_sb = CIFS_SB(cifs_inode->vfs_inode.i_sb); |
1640 | ||
6508d904 JL |
1641 | /* only filter by fsuid on multiuser mounts */ |
1642 | if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MULTIUSER)) | |
1643 | fsuid_only = false; | |
1644 | ||
4477288a | 1645 | spin_lock(&cifs_file_list_lock); |
9b22b0b7 | 1646 | refind_writable: |
2c0c2a08 SP |
1647 | if (refind > MAX_REOPEN_ATT) { |
1648 | spin_unlock(&cifs_file_list_lock); | |
1649 | return NULL; | |
1650 | } | |
6148a742 | 1651 | list_for_each_entry(open_file, &cifs_inode->openFileList, flist) { |
6508d904 JL |
1652 | if (!any_available && open_file->pid != current->tgid) |
1653 | continue; | |
1654 | if (fsuid_only && open_file->uid != current_fsuid()) | |
6148a742 | 1655 | continue; |
2e396b83 | 1656 | if (OPEN_FMODE(open_file->f_flags) & FMODE_WRITE) { |
9b22b0b7 SF |
1657 | if (!open_file->invalidHandle) { |
1658 | /* found a good writable file */ | |
764a1b1a | 1659 | cifsFileInfo_get_locked(open_file); |
4477288a | 1660 | spin_unlock(&cifs_file_list_lock); |
9b22b0b7 | 1661 | return open_file; |
2c0c2a08 SP |
1662 | } else { |
1663 | if (!inv_file) | |
1664 | inv_file = open_file; | |
9b22b0b7 | 1665 | } |
6148a742 SF |
1666 | } |
1667 | } | |
2846d386 JL |
1668 | /* couldn't find useable FH with same pid, try any available */ |
1669 | if (!any_available) { | |
1670 | any_available = true; | |
1671 | goto refind_writable; | |
1672 | } | |
2c0c2a08 SP |
1673 | |
1674 | if (inv_file) { | |
1675 | any_available = false; | |
764a1b1a | 1676 | cifsFileInfo_get_locked(inv_file); |
2c0c2a08 SP |
1677 | } |
1678 | ||
4477288a | 1679 | spin_unlock(&cifs_file_list_lock); |
2c0c2a08 SP |
1680 | |
1681 | if (inv_file) { | |
1682 | rc = cifs_reopen_file(inv_file, false); | |
1683 | if (!rc) | |
1684 | return inv_file; | |
1685 | else { | |
1686 | spin_lock(&cifs_file_list_lock); | |
1687 | list_move_tail(&inv_file->flist, | |
1688 | &cifs_inode->openFileList); | |
1689 | spin_unlock(&cifs_file_list_lock); | |
1690 | cifsFileInfo_put(inv_file); | |
1691 | spin_lock(&cifs_file_list_lock); | |
1692 | ++refind; | |
1693 | goto refind_writable; | |
1694 | } | |
1695 | } | |
1696 | ||
6148a742 SF |
1697 | return NULL; |
1698 | } | |
1699 | ||
1da177e4 LT |
1700 | static int cifs_partialpagewrite(struct page *page, unsigned from, unsigned to) |
1701 | { | |
1702 | struct address_space *mapping = page->mapping; | |
1703 | loff_t offset = (loff_t)page->index << PAGE_CACHE_SHIFT; | |
1704 | char *write_data; | |
1705 | int rc = -EFAULT; | |
1706 | int bytes_written = 0; | |
1da177e4 | 1707 | struct inode *inode; |
6148a742 | 1708 | struct cifsFileInfo *open_file; |
1da177e4 LT |
1709 | |
1710 | if (!mapping || !mapping->host) | |
1711 | return -EFAULT; | |
1712 | ||
1713 | inode = page->mapping->host; | |
1da177e4 LT |
1714 | |
1715 | offset += (loff_t)from; | |
1716 | write_data = kmap(page); | |
1717 | write_data += from; | |
1718 | ||
1719 | if ((to > PAGE_CACHE_SIZE) || (from > to)) { | |
1720 | kunmap(page); | |
1721 | return -EIO; | |
1722 | } | |
1723 | ||
1724 | /* racing with truncate? */ | |
1725 | if (offset > mapping->host->i_size) { | |
1726 | kunmap(page); | |
1727 | return 0; /* don't care */ | |
1728 | } | |
1729 | ||
1730 | /* check to make sure that we are not extending the file */ | |
1731 | if (mapping->host->i_size - offset < (loff_t)to) | |
fb8c4b14 | 1732 | to = (unsigned)(mapping->host->i_size - offset); |
1da177e4 | 1733 | |
6508d904 | 1734 | open_file = find_writable_file(CIFS_I(mapping->host), false); |
6148a742 | 1735 | if (open_file) { |
fa2989f4 PS |
1736 | bytes_written = cifs_write(open_file, open_file->pid, |
1737 | write_data, to - from, &offset); | |
6ab409b5 | 1738 | cifsFileInfo_put(open_file); |
1da177e4 | 1739 | /* Does mm or vfs already set times? */ |
6148a742 | 1740 | inode->i_atime = inode->i_mtime = current_fs_time(inode->i_sb); |
bb5a9a04 | 1741 | if ((bytes_written > 0) && (offset)) |
6148a742 | 1742 | rc = 0; |
bb5a9a04 SF |
1743 | else if (bytes_written < 0) |
1744 | rc = bytes_written; | |
6148a742 | 1745 | } else { |
b6b38f70 | 1746 | cFYI(1, "No writeable filehandles for inode"); |
1da177e4 LT |
1747 | rc = -EIO; |
1748 | } | |
1749 | ||
1750 | kunmap(page); | |
1751 | return rc; | |
1752 | } | |
1753 | ||
1da177e4 | 1754 | static int cifs_writepages(struct address_space *mapping, |
37c0eb46 | 1755 | struct writeback_control *wbc) |
1da177e4 | 1756 | { |
c3d17b63 JL |
1757 | struct cifs_sb_info *cifs_sb = CIFS_SB(mapping->host->i_sb); |
1758 | bool done = false, scanned = false, range_whole = false; | |
1759 | pgoff_t end, index; | |
1760 | struct cifs_writedata *wdata; | |
c9de5c80 | 1761 | struct TCP_Server_Info *server; |
37c0eb46 | 1762 | struct page *page; |
37c0eb46 | 1763 | int rc = 0; |
eddb079d | 1764 | loff_t isize = i_size_read(mapping->host); |
50c2f753 | 1765 | |
37c0eb46 | 1766 | /* |
c3d17b63 | 1767 | * If wsize is smaller than the page cache size, default to writing |
37c0eb46 SF |
1768 | * one page at a time via cifs_writepage |
1769 | */ | |
1770 | if (cifs_sb->wsize < PAGE_CACHE_SIZE) | |
1771 | return generic_writepages(mapping, wbc); | |
1772 | ||
111ebb6e | 1773 | if (wbc->range_cyclic) { |
37c0eb46 | 1774 | index = mapping->writeback_index; /* Start from prev offset */ |
111ebb6e OH |
1775 | end = -1; |
1776 | } else { | |
1777 | index = wbc->range_start >> PAGE_CACHE_SHIFT; | |
1778 | end = wbc->range_end >> PAGE_CACHE_SHIFT; | |
1779 | if (wbc->range_start == 0 && wbc->range_end == LLONG_MAX) | |
c3d17b63 JL |
1780 | range_whole = true; |
1781 | scanned = true; | |
37c0eb46 SF |
1782 | } |
1783 | retry: | |
c3d17b63 JL |
1784 | while (!done && index <= end) { |
1785 | unsigned int i, nr_pages, found_pages; | |
1786 | pgoff_t next = 0, tofind; | |
1787 | struct page **pages; | |
1788 | ||
1789 | tofind = min((cifs_sb->wsize / PAGE_CACHE_SIZE) - 1, | |
1790 | end - index) + 1; | |
1791 | ||
c2e87640 JL |
1792 | wdata = cifs_writedata_alloc((unsigned int)tofind, |
1793 | cifs_writev_complete); | |
c3d17b63 JL |
1794 | if (!wdata) { |
1795 | rc = -ENOMEM; | |
1796 | break; | |
1797 | } | |
1798 | ||
1799 | /* | |
1800 | * find_get_pages_tag seems to return a max of 256 on each | |
1801 | * iteration, so we must call it several times in order to | |
1802 | * fill the array or the wsize is effectively limited to | |
1803 | * 256 * PAGE_CACHE_SIZE. | |
1804 | */ | |
1805 | found_pages = 0; | |
1806 | pages = wdata->pages; | |
1807 | do { | |
1808 | nr_pages = find_get_pages_tag(mapping, &index, | |
1809 | PAGECACHE_TAG_DIRTY, | |
1810 | tofind, pages); | |
1811 | found_pages += nr_pages; | |
1812 | tofind -= nr_pages; | |
1813 | pages += nr_pages; | |
1814 | } while (nr_pages && tofind && index <= end); | |
1815 | ||
1816 | if (found_pages == 0) { | |
1817 | kref_put(&wdata->refcount, cifs_writedata_release); | |
1818 | break; | |
1819 | } | |
1820 | ||
1821 | nr_pages = 0; | |
1822 | for (i = 0; i < found_pages; i++) { | |
1823 | page = wdata->pages[i]; | |
37c0eb46 SF |
1824 | /* |
1825 | * At this point we hold neither mapping->tree_lock nor | |
1826 | * lock on the page itself: the page may be truncated or | |
1827 | * invalidated (changing page->mapping to NULL), or even | |
1828 | * swizzled back from swapper_space to tmpfs file | |
1829 | * mapping | |
1830 | */ | |
1831 | ||
c3d17b63 | 1832 | if (nr_pages == 0) |
37c0eb46 | 1833 | lock_page(page); |
529ae9aa | 1834 | else if (!trylock_page(page)) |
37c0eb46 SF |
1835 | break; |
1836 | ||
1837 | if (unlikely(page->mapping != mapping)) { | |
1838 | unlock_page(page); | |
1839 | break; | |
1840 | } | |
1841 | ||
111ebb6e | 1842 | if (!wbc->range_cyclic && page->index > end) { |
c3d17b63 | 1843 | done = true; |
37c0eb46 SF |
1844 | unlock_page(page); |
1845 | break; | |
1846 | } | |
1847 | ||
1848 | if (next && (page->index != next)) { | |
1849 | /* Not next consecutive page */ | |
1850 | unlock_page(page); | |
1851 | break; | |
1852 | } | |
1853 | ||
1854 | if (wbc->sync_mode != WB_SYNC_NONE) | |
1855 | wait_on_page_writeback(page); | |
1856 | ||
1857 | if (PageWriteback(page) || | |
cb876f45 | 1858 | !clear_page_dirty_for_io(page)) { |
37c0eb46 SF |
1859 | unlock_page(page); |
1860 | break; | |
1861 | } | |
84d2f07e | 1862 | |
cb876f45 LT |
1863 | /* |
1864 | * This actually clears the dirty bit in the radix tree. | |
1865 | * See cifs_writepage() for more commentary. | |
1866 | */ | |
1867 | set_page_writeback(page); | |
1868 | ||
eddb079d | 1869 | if (page_offset(page) >= isize) { |
c3d17b63 | 1870 | done = true; |
84d2f07e | 1871 | unlock_page(page); |
cb876f45 | 1872 | end_page_writeback(page); |
84d2f07e SF |
1873 | break; |
1874 | } | |
1875 | ||
c3d17b63 JL |
1876 | wdata->pages[i] = page; |
1877 | next = page->index + 1; | |
1878 | ++nr_pages; | |
1879 | } | |
37c0eb46 | 1880 | |
c3d17b63 JL |
1881 | /* reset index to refind any pages skipped */ |
1882 | if (nr_pages == 0) | |
1883 | index = wdata->pages[0]->index + 1; | |
84d2f07e | 1884 | |
c3d17b63 JL |
1885 | /* put any pages we aren't going to use */ |
1886 | for (i = nr_pages; i < found_pages; i++) { | |
1887 | page_cache_release(wdata->pages[i]); | |
1888 | wdata->pages[i] = NULL; | |
1889 | } | |
37c0eb46 | 1890 | |
c3d17b63 JL |
1891 | /* nothing to write? */ |
1892 | if (nr_pages == 0) { | |
1893 | kref_put(&wdata->refcount, cifs_writedata_release); | |
1894 | continue; | |
37c0eb46 | 1895 | } |
fbec9ab9 | 1896 | |
c3d17b63 JL |
1897 | wdata->sync_mode = wbc->sync_mode; |
1898 | wdata->nr_pages = nr_pages; | |
1899 | wdata->offset = page_offset(wdata->pages[0]); | |
eddb079d JL |
1900 | wdata->pagesz = PAGE_CACHE_SIZE; |
1901 | wdata->tailsz = | |
1902 | min(isize - page_offset(wdata->pages[nr_pages - 1]), | |
1903 | (loff_t)PAGE_CACHE_SIZE); | |
1904 | wdata->bytes = ((nr_pages - 1) * PAGE_CACHE_SIZE) + | |
1905 | wdata->tailsz; | |
941b853d | 1906 | |
c3d17b63 JL |
1907 | do { |
1908 | if (wdata->cfile != NULL) | |
1909 | cifsFileInfo_put(wdata->cfile); | |
1910 | wdata->cfile = find_writable_file(CIFS_I(mapping->host), | |
1911 | false); | |
1912 | if (!wdata->cfile) { | |
1913 | cERROR(1, "No writable handles for inode"); | |
1914 | rc = -EBADF; | |
1915 | break; | |
941b853d | 1916 | } |
fe5f5d2e | 1917 | wdata->pid = wdata->cfile->pid; |
c9de5c80 PS |
1918 | server = tlink_tcon(wdata->cfile->tlink)->ses->server; |
1919 | rc = server->ops->async_writev(wdata); | |
c3d17b63 | 1920 | } while (wbc->sync_mode == WB_SYNC_ALL && rc == -EAGAIN); |
941b853d | 1921 | |
c3d17b63 JL |
1922 | for (i = 0; i < nr_pages; ++i) |
1923 | unlock_page(wdata->pages[i]); | |
f3983c21 | 1924 | |
c3d17b63 JL |
1925 | /* send failure -- clean up the mess */ |
1926 | if (rc != 0) { | |
1927 | for (i = 0; i < nr_pages; ++i) { | |
941b853d | 1928 | if (rc == -EAGAIN) |
c3d17b63 JL |
1929 | redirty_page_for_writepage(wbc, |
1930 | wdata->pages[i]); | |
1931 | else | |
1932 | SetPageError(wdata->pages[i]); | |
1933 | end_page_writeback(wdata->pages[i]); | |
1934 | page_cache_release(wdata->pages[i]); | |
37c0eb46 | 1935 | } |
941b853d JL |
1936 | if (rc != -EAGAIN) |
1937 | mapping_set_error(mapping, rc); | |
c3d17b63 JL |
1938 | } |
1939 | kref_put(&wdata->refcount, cifs_writedata_release); | |
941b853d | 1940 | |
c3d17b63 JL |
1941 | wbc->nr_to_write -= nr_pages; |
1942 | if (wbc->nr_to_write <= 0) | |
1943 | done = true; | |
b066a48c | 1944 | |
c3d17b63 | 1945 | index = next; |
37c0eb46 | 1946 | } |
c3d17b63 | 1947 | |
37c0eb46 SF |
1948 | if (!scanned && !done) { |
1949 | /* | |
1950 | * We hit the last page and there is more work to be done: wrap | |
1951 | * back to the start of the file | |
1952 | */ | |
c3d17b63 | 1953 | scanned = true; |
37c0eb46 SF |
1954 | index = 0; |
1955 | goto retry; | |
1956 | } | |
c3d17b63 | 1957 | |
111ebb6e | 1958 | if (wbc->range_cyclic || (range_whole && wbc->nr_to_write > 0)) |
37c0eb46 SF |
1959 | mapping->writeback_index = index; |
1960 | ||
1da177e4 LT |
1961 | return rc; |
1962 | } | |
1da177e4 | 1963 | |
9ad1506b PS |
1964 | static int |
1965 | cifs_writepage_locked(struct page *page, struct writeback_control *wbc) | |
1da177e4 | 1966 | { |
9ad1506b | 1967 | int rc; |
6d5786a3 | 1968 | unsigned int xid; |
1da177e4 | 1969 | |
6d5786a3 | 1970 | xid = get_xid(); |
1da177e4 LT |
1971 | /* BB add check for wbc flags */ |
1972 | page_cache_get(page); | |
ad7a2926 | 1973 | if (!PageUptodate(page)) |
b6b38f70 | 1974 | cFYI(1, "ppw - page not up to date"); |
cb876f45 LT |
1975 | |
1976 | /* | |
1977 | * Set the "writeback" flag, and clear "dirty" in the radix tree. | |
1978 | * | |
1979 | * A writepage() implementation always needs to do either this, | |
1980 | * or re-dirty the page with "redirty_page_for_writepage()" in | |
1981 | * the case of a failure. | |
1982 | * | |
1983 | * Just unlocking the page will cause the radix tree tag-bits | |
1984 | * to fail to update with the state of the page correctly. | |
1985 | */ | |
fb8c4b14 | 1986 | set_page_writeback(page); |
9ad1506b | 1987 | retry_write: |
1da177e4 | 1988 | rc = cifs_partialpagewrite(page, 0, PAGE_CACHE_SIZE); |
9ad1506b PS |
1989 | if (rc == -EAGAIN && wbc->sync_mode == WB_SYNC_ALL) |
1990 | goto retry_write; | |
1991 | else if (rc == -EAGAIN) | |
1992 | redirty_page_for_writepage(wbc, page); | |
1993 | else if (rc != 0) | |
1994 | SetPageError(page); | |
1995 | else | |
1996 | SetPageUptodate(page); | |
cb876f45 LT |
1997 | end_page_writeback(page); |
1998 | page_cache_release(page); | |
6d5786a3 | 1999 | free_xid(xid); |
1da177e4 LT |
2000 | return rc; |
2001 | } | |
2002 | ||
9ad1506b PS |
2003 | static int cifs_writepage(struct page *page, struct writeback_control *wbc) |
2004 | { | |
2005 | int rc = cifs_writepage_locked(page, wbc); | |
2006 | unlock_page(page); | |
2007 | return rc; | |
2008 | } | |
2009 | ||
d9414774 NP |
2010 | static int cifs_write_end(struct file *file, struct address_space *mapping, |
2011 | loff_t pos, unsigned len, unsigned copied, | |
2012 | struct page *page, void *fsdata) | |
1da177e4 | 2013 | { |
d9414774 NP |
2014 | int rc; |
2015 | struct inode *inode = mapping->host; | |
d4ffff1f PS |
2016 | struct cifsFileInfo *cfile = file->private_data; |
2017 | struct cifs_sb_info *cifs_sb = CIFS_SB(cfile->dentry->d_sb); | |
2018 | __u32 pid; | |
2019 | ||
2020 | if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_RWPIDFORWARD) | |
2021 | pid = cfile->pid; | |
2022 | else | |
2023 | pid = current->tgid; | |
1da177e4 | 2024 | |
b6b38f70 JP |
2025 | cFYI(1, "write_end for page %p from pos %lld with %d bytes", |
2026 | page, pos, copied); | |
d9414774 | 2027 | |
a98ee8c1 JL |
2028 | if (PageChecked(page)) { |
2029 | if (copied == len) | |
2030 | SetPageUptodate(page); | |
2031 | ClearPageChecked(page); | |
2032 | } else if (!PageUptodate(page) && copied == PAGE_CACHE_SIZE) | |
d9414774 | 2033 | SetPageUptodate(page); |
ad7a2926 | 2034 | |
1da177e4 | 2035 | if (!PageUptodate(page)) { |
d9414774 NP |
2036 | char *page_data; |
2037 | unsigned offset = pos & (PAGE_CACHE_SIZE - 1); | |
6d5786a3 | 2038 | unsigned int xid; |
d9414774 | 2039 | |
6d5786a3 | 2040 | xid = get_xid(); |
1da177e4 LT |
2041 | /* this is probably better than directly calling |
2042 | partialpage_write since in this function the file handle is | |
2043 | known which we might as well leverage */ | |
2044 | /* BB check if anything else missing out of ppw | |
2045 | such as updating last write time */ | |
2046 | page_data = kmap(page); | |
d4ffff1f | 2047 | rc = cifs_write(cfile, pid, page_data + offset, copied, &pos); |
d9414774 | 2048 | /* if (rc < 0) should we set writebehind rc? */ |
1da177e4 | 2049 | kunmap(page); |
d9414774 | 2050 | |
6d5786a3 | 2051 | free_xid(xid); |
fb8c4b14 | 2052 | } else { |
d9414774 NP |
2053 | rc = copied; |
2054 | pos += copied; | |
1da177e4 LT |
2055 | set_page_dirty(page); |
2056 | } | |
2057 | ||
d9414774 NP |
2058 | if (rc > 0) { |
2059 | spin_lock(&inode->i_lock); | |
2060 | if (pos > inode->i_size) | |
2061 | i_size_write(inode, pos); | |
2062 | spin_unlock(&inode->i_lock); | |
2063 | } | |
2064 | ||
2065 | unlock_page(page); | |
2066 | page_cache_release(page); | |
2067 | ||
1da177e4 LT |
2068 | return rc; |
2069 | } | |
2070 | ||
02c24a82 JB |
2071 | int cifs_strict_fsync(struct file *file, loff_t start, loff_t end, |
2072 | int datasync) | |
1da177e4 | 2073 | { |
6d5786a3 | 2074 | unsigned int xid; |
1da177e4 | 2075 | int rc = 0; |
96daf2b0 | 2076 | struct cifs_tcon *tcon; |
1d8c4c00 | 2077 | struct TCP_Server_Info *server; |
c21dfb69 | 2078 | struct cifsFileInfo *smbfile = file->private_data; |
e6a00296 | 2079 | struct inode *inode = file->f_path.dentry->d_inode; |
8be7e6ba | 2080 | struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb); |
1da177e4 | 2081 | |
02c24a82 JB |
2082 | rc = filemap_write_and_wait_range(inode->i_mapping, start, end); |
2083 | if (rc) | |
2084 | return rc; | |
2085 | mutex_lock(&inode->i_mutex); | |
2086 | ||
6d5786a3 | 2087 | xid = get_xid(); |
1da177e4 | 2088 | |
b6b38f70 | 2089 | cFYI(1, "Sync file - name: %s datasync: 0x%x", |
7ea80859 | 2090 | file->f_path.dentry->d_name.name, datasync); |
50c2f753 | 2091 | |
6feb9891 PS |
2092 | if (!CIFS_I(inode)->clientCanCacheRead) { |
2093 | rc = cifs_invalidate_mapping(inode); | |
2094 | if (rc) { | |
2095 | cFYI(1, "rc: %d during invalidate phase", rc); | |
2096 | rc = 0; /* don't care about it in fsync */ | |
2097 | } | |
2098 | } | |
eb4b756b | 2099 | |
8be7e6ba | 2100 | tcon = tlink_tcon(smbfile->tlink); |
1d8c4c00 PS |
2101 | if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NOSSYNC)) { |
2102 | server = tcon->ses->server; | |
2103 | if (server->ops->flush) | |
2104 | rc = server->ops->flush(xid, tcon, &smbfile->fid); | |
2105 | else | |
2106 | rc = -ENOSYS; | |
2107 | } | |
8be7e6ba | 2108 | |
6d5786a3 | 2109 | free_xid(xid); |
02c24a82 | 2110 | mutex_unlock(&inode->i_mutex); |
8be7e6ba PS |
2111 | return rc; |
2112 | } | |
2113 | ||
02c24a82 | 2114 | int cifs_fsync(struct file *file, loff_t start, loff_t end, int datasync) |
8be7e6ba | 2115 | { |
6d5786a3 | 2116 | unsigned int xid; |
8be7e6ba | 2117 | int rc = 0; |
96daf2b0 | 2118 | struct cifs_tcon *tcon; |
1d8c4c00 | 2119 | struct TCP_Server_Info *server; |
8be7e6ba PS |
2120 | struct cifsFileInfo *smbfile = file->private_data; |
2121 | struct cifs_sb_info *cifs_sb = CIFS_SB(file->f_path.dentry->d_sb); | |
02c24a82 JB |
2122 | struct inode *inode = file->f_mapping->host; |
2123 | ||
2124 | rc = filemap_write_and_wait_range(inode->i_mapping, start, end); | |
2125 | if (rc) | |
2126 | return rc; | |
2127 | mutex_lock(&inode->i_mutex); | |
8be7e6ba | 2128 | |
6d5786a3 | 2129 | xid = get_xid(); |
8be7e6ba PS |
2130 | |
2131 | cFYI(1, "Sync file - name: %s datasync: 0x%x", | |
2132 | file->f_path.dentry->d_name.name, datasync); | |
2133 | ||
2134 | tcon = tlink_tcon(smbfile->tlink); | |
1d8c4c00 PS |
2135 | if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NOSSYNC)) { |
2136 | server = tcon->ses->server; | |
2137 | if (server->ops->flush) | |
2138 | rc = server->ops->flush(xid, tcon, &smbfile->fid); | |
2139 | else | |
2140 | rc = -ENOSYS; | |
2141 | } | |
b298f223 | 2142 | |
6d5786a3 | 2143 | free_xid(xid); |
02c24a82 | 2144 | mutex_unlock(&inode->i_mutex); |
1da177e4 LT |
2145 | return rc; |
2146 | } | |
2147 | ||
1da177e4 LT |
2148 | /* |
2149 | * As file closes, flush all cached write data for this inode checking | |
2150 | * for write behind errors. | |
2151 | */ | |
75e1fcc0 | 2152 | int cifs_flush(struct file *file, fl_owner_t id) |
1da177e4 | 2153 | { |
fb8c4b14 | 2154 | struct inode *inode = file->f_path.dentry->d_inode; |
1da177e4 LT |
2155 | int rc = 0; |
2156 | ||
eb4b756b | 2157 | if (file->f_mode & FMODE_WRITE) |
d3f1322a | 2158 | rc = filemap_write_and_wait(inode->i_mapping); |
50c2f753 | 2159 | |
b6b38f70 | 2160 | cFYI(1, "Flush inode %p file %p rc %d", inode, file, rc); |
1da177e4 LT |
2161 | |
2162 | return rc; | |
2163 | } | |
2164 | ||
72432ffc PS |
2165 | static int |
2166 | cifs_write_allocate_pages(struct page **pages, unsigned long num_pages) | |
2167 | { | |
2168 | int rc = 0; | |
2169 | unsigned long i; | |
2170 | ||
2171 | for (i = 0; i < num_pages; i++) { | |
e94f7ba1 | 2172 | pages[i] = alloc_page(GFP_KERNEL|__GFP_HIGHMEM); |
72432ffc PS |
2173 | if (!pages[i]) { |
2174 | /* | |
2175 | * save number of pages we have already allocated and | |
2176 | * return with ENOMEM error | |
2177 | */ | |
2178 | num_pages = i; | |
2179 | rc = -ENOMEM; | |
e94f7ba1 | 2180 | break; |
72432ffc PS |
2181 | } |
2182 | } | |
2183 | ||
e94f7ba1 JL |
2184 | if (rc) { |
2185 | for (i = 0; i < num_pages; i++) | |
2186 | put_page(pages[i]); | |
2187 | } | |
72432ffc PS |
2188 | return rc; |
2189 | } | |
2190 | ||
2191 | static inline | |
2192 | size_t get_numpages(const size_t wsize, const size_t len, size_t *cur_len) | |
2193 | { | |
2194 | size_t num_pages; | |
2195 | size_t clen; | |
2196 | ||
2197 | clen = min_t(const size_t, len, wsize); | |
a7103b99 | 2198 | num_pages = DIV_ROUND_UP(clen, PAGE_SIZE); |
72432ffc PS |
2199 | |
2200 | if (cur_len) | |
2201 | *cur_len = clen; | |
2202 | ||
2203 | return num_pages; | |
2204 | } | |
2205 | ||
da82f7e7 JL |
2206 | static void |
2207 | cifs_uncached_writev_complete(struct work_struct *work) | |
2208 | { | |
2209 | int i; | |
2210 | struct cifs_writedata *wdata = container_of(work, | |
2211 | struct cifs_writedata, work); | |
2212 | struct inode *inode = wdata->cfile->dentry->d_inode; | |
2213 | struct cifsInodeInfo *cifsi = CIFS_I(inode); | |
2214 | ||
2215 | spin_lock(&inode->i_lock); | |
2216 | cifs_update_eof(cifsi, wdata->offset, wdata->bytes); | |
2217 | if (cifsi->server_eof > inode->i_size) | |
2218 | i_size_write(inode, cifsi->server_eof); | |
2219 | spin_unlock(&inode->i_lock); | |
2220 | ||
2221 | complete(&wdata->done); | |
2222 | ||
2223 | if (wdata->result != -EAGAIN) { | |
2224 | for (i = 0; i < wdata->nr_pages; i++) | |
2225 | put_page(wdata->pages[i]); | |
2226 | } | |
2227 | ||
2228 | kref_put(&wdata->refcount, cifs_writedata_release); | |
2229 | } | |
2230 | ||
2231 | /* attempt to send write to server, retry on any -EAGAIN errors */ | |
2232 | static int | |
2233 | cifs_uncached_retry_writev(struct cifs_writedata *wdata) | |
2234 | { | |
2235 | int rc; | |
c9de5c80 PS |
2236 | struct TCP_Server_Info *server; |
2237 | ||
2238 | server = tlink_tcon(wdata->cfile->tlink)->ses->server; | |
da82f7e7 JL |
2239 | |
2240 | do { | |
2241 | if (wdata->cfile->invalidHandle) { | |
2242 | rc = cifs_reopen_file(wdata->cfile, false); | |
2243 | if (rc != 0) | |
2244 | continue; | |
2245 | } | |
c9de5c80 | 2246 | rc = server->ops->async_writev(wdata); |
da82f7e7 JL |
2247 | } while (rc == -EAGAIN); |
2248 | ||
2249 | return rc; | |
2250 | } | |
2251 | ||
72432ffc PS |
2252 | static ssize_t |
2253 | cifs_iovec_write(struct file *file, const struct iovec *iov, | |
2254 | unsigned long nr_segs, loff_t *poffset) | |
2255 | { | |
da82f7e7 | 2256 | unsigned long nr_pages, i; |
76429c14 PS |
2257 | size_t copied, len, cur_len; |
2258 | ssize_t total_written = 0; | |
3af9d8f2 | 2259 | loff_t offset; |
72432ffc | 2260 | struct iov_iter it; |
72432ffc | 2261 | struct cifsFileInfo *open_file; |
da82f7e7 | 2262 | struct cifs_tcon *tcon; |
72432ffc | 2263 | struct cifs_sb_info *cifs_sb; |
da82f7e7 JL |
2264 | struct cifs_writedata *wdata, *tmp; |
2265 | struct list_head wdata_list; | |
2266 | int rc; | |
2267 | pid_t pid; | |
72432ffc PS |
2268 | |
2269 | len = iov_length(iov, nr_segs); | |
2270 | if (!len) | |
2271 | return 0; | |
2272 | ||
2273 | rc = generic_write_checks(file, poffset, &len, 0); | |
2274 | if (rc) | |
2275 | return rc; | |
2276 | ||
da82f7e7 | 2277 | INIT_LIST_HEAD(&wdata_list); |
72432ffc | 2278 | cifs_sb = CIFS_SB(file->f_path.dentry->d_sb); |
72432ffc | 2279 | open_file = file->private_data; |
da82f7e7 | 2280 | tcon = tlink_tcon(open_file->tlink); |
c9de5c80 PS |
2281 | |
2282 | if (!tcon->ses->server->ops->async_writev) | |
2283 | return -ENOSYS; | |
2284 | ||
3af9d8f2 | 2285 | offset = *poffset; |
d4ffff1f PS |
2286 | |
2287 | if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_RWPIDFORWARD) | |
2288 | pid = open_file->pid; | |
2289 | else | |
2290 | pid = current->tgid; | |
2291 | ||
72432ffc | 2292 | iov_iter_init(&it, iov, nr_segs, len, 0); |
72432ffc | 2293 | do { |
da82f7e7 JL |
2294 | size_t save_len; |
2295 | ||
2296 | nr_pages = get_numpages(cifs_sb->wsize, len, &cur_len); | |
2297 | wdata = cifs_writedata_alloc(nr_pages, | |
2298 | cifs_uncached_writev_complete); | |
2299 | if (!wdata) { | |
2300 | rc = -ENOMEM; | |
2301 | break; | |
2302 | } | |
2303 | ||
2304 | rc = cifs_write_allocate_pages(wdata->pages, nr_pages); | |
2305 | if (rc) { | |
2306 | kfree(wdata); | |
2307 | break; | |
2308 | } | |
2309 | ||
2310 | save_len = cur_len; | |
2311 | for (i = 0; i < nr_pages; i++) { | |
2312 | copied = min_t(const size_t, cur_len, PAGE_SIZE); | |
2313 | copied = iov_iter_copy_from_user(wdata->pages[i], &it, | |
2314 | 0, copied); | |
72432ffc PS |
2315 | cur_len -= copied; |
2316 | iov_iter_advance(&it, copied); | |
72432ffc | 2317 | } |
72432ffc PS |
2318 | cur_len = save_len - cur_len; |
2319 | ||
da82f7e7 JL |
2320 | wdata->sync_mode = WB_SYNC_ALL; |
2321 | wdata->nr_pages = nr_pages; | |
2322 | wdata->offset = (__u64)offset; | |
2323 | wdata->cfile = cifsFileInfo_get(open_file); | |
2324 | wdata->pid = pid; | |
2325 | wdata->bytes = cur_len; | |
eddb079d JL |
2326 | wdata->pagesz = PAGE_SIZE; |
2327 | wdata->tailsz = cur_len - ((nr_pages - 1) * PAGE_SIZE); | |
da82f7e7 JL |
2328 | rc = cifs_uncached_retry_writev(wdata); |
2329 | if (rc) { | |
2330 | kref_put(&wdata->refcount, cifs_writedata_release); | |
72432ffc PS |
2331 | break; |
2332 | } | |
2333 | ||
da82f7e7 JL |
2334 | list_add_tail(&wdata->list, &wdata_list); |
2335 | offset += cur_len; | |
2336 | len -= cur_len; | |
72432ffc PS |
2337 | } while (len > 0); |
2338 | ||
da82f7e7 JL |
2339 | /* |
2340 | * If at least one write was successfully sent, then discard any rc | |
2341 | * value from the later writes. If the other write succeeds, then | |
2342 | * we'll end up returning whatever was written. If it fails, then | |
2343 | * we'll get a new rc value from that. | |
2344 | */ | |
2345 | if (!list_empty(&wdata_list)) | |
2346 | rc = 0; | |
2347 | ||
2348 | /* | |
2349 | * Wait for and collect replies for any successful sends in order of | |
2350 | * increasing offset. Once an error is hit or we get a fatal signal | |
2351 | * while waiting, then return without waiting for any more replies. | |
2352 | */ | |
2353 | restart_loop: | |
2354 | list_for_each_entry_safe(wdata, tmp, &wdata_list, list) { | |
2355 | if (!rc) { | |
2356 | /* FIXME: freezable too? */ | |
2357 | rc = wait_for_completion_killable(&wdata->done); | |
2358 | if (rc) | |
2359 | rc = -EINTR; | |
2360 | else if (wdata->result) | |
2361 | rc = wdata->result; | |
2362 | else | |
2363 | total_written += wdata->bytes; | |
2364 | ||
2365 | /* resend call if it's a retryable error */ | |
2366 | if (rc == -EAGAIN) { | |
2367 | rc = cifs_uncached_retry_writev(wdata); | |
2368 | goto restart_loop; | |
2369 | } | |
2370 | } | |
2371 | list_del_init(&wdata->list); | |
2372 | kref_put(&wdata->refcount, cifs_writedata_release); | |
72432ffc PS |
2373 | } |
2374 | ||
da82f7e7 JL |
2375 | if (total_written > 0) |
2376 | *poffset += total_written; | |
72432ffc | 2377 | |
da82f7e7 JL |
2378 | cifs_stats_bytes_written(tcon, total_written); |
2379 | return total_written ? total_written : (ssize_t)rc; | |
72432ffc PS |
2380 | } |
2381 | ||
0b81c1c4 | 2382 | ssize_t cifs_user_writev(struct kiocb *iocb, const struct iovec *iov, |
72432ffc PS |
2383 | unsigned long nr_segs, loff_t pos) |
2384 | { | |
2385 | ssize_t written; | |
2386 | struct inode *inode; | |
2387 | ||
2388 | inode = iocb->ki_filp->f_path.dentry->d_inode; | |
2389 | ||
2390 | /* | |
2391 | * BB - optimize the way when signing is disabled. We can drop this | |
2392 | * extra memory-to-memory copying and use iovec buffers for constructing | |
2393 | * write request. | |
2394 | */ | |
2395 | ||
2396 | written = cifs_iovec_write(iocb->ki_filp, iov, nr_segs, &pos); | |
2397 | if (written > 0) { | |
2398 | CIFS_I(inode)->invalid_mapping = true; | |
2399 | iocb->ki_pos = pos; | |
2400 | } | |
2401 | ||
2402 | return written; | |
2403 | } | |
2404 | ||
2405 | ssize_t cifs_strict_writev(struct kiocb *iocb, const struct iovec *iov, | |
2406 | unsigned long nr_segs, loff_t pos) | |
2407 | { | |
2408 | struct inode *inode; | |
2409 | ||
2410 | inode = iocb->ki_filp->f_path.dentry->d_inode; | |
2411 | ||
2412 | if (CIFS_I(inode)->clientCanCacheAll) | |
2413 | return generic_file_aio_write(iocb, iov, nr_segs, pos); | |
2414 | ||
2415 | /* | |
2416 | * In strict cache mode we need to write the data to the server exactly | |
2417 | * from the pos to pos+len-1 rather than flush all affected pages | |
2418 | * because it may cause a error with mandatory locks on these pages but | |
2419 | * not on the region from pos to ppos+len-1. | |
2420 | */ | |
2421 | ||
2422 | return cifs_user_writev(iocb, iov, nr_segs, pos); | |
2423 | } | |
2424 | ||
0471ca3f | 2425 | static struct cifs_readdata * |
f4e49cd2 | 2426 | cifs_readdata_alloc(unsigned int nr_pages, work_func_t complete) |
0471ca3f JL |
2427 | { |
2428 | struct cifs_readdata *rdata; | |
f4e49cd2 | 2429 | |
c5fab6f4 JL |
2430 | rdata = kzalloc(sizeof(*rdata) + (sizeof(struct page *) * nr_pages), |
2431 | GFP_KERNEL); | |
0471ca3f | 2432 | if (rdata != NULL) { |
6993f74a | 2433 | kref_init(&rdata->refcount); |
1c892549 JL |
2434 | INIT_LIST_HEAD(&rdata->list); |
2435 | init_completion(&rdata->done); | |
0471ca3f | 2436 | INIT_WORK(&rdata->work, complete); |
0471ca3f | 2437 | } |
f4e49cd2 | 2438 | |
0471ca3f JL |
2439 | return rdata; |
2440 | } | |
2441 | ||
6993f74a JL |
2442 | void |
2443 | cifs_readdata_release(struct kref *refcount) | |
0471ca3f | 2444 | { |
6993f74a JL |
2445 | struct cifs_readdata *rdata = container_of(refcount, |
2446 | struct cifs_readdata, refcount); | |
2447 | ||
2448 | if (rdata->cfile) | |
2449 | cifsFileInfo_put(rdata->cfile); | |
2450 | ||
0471ca3f JL |
2451 | kfree(rdata); |
2452 | } | |
2453 | ||
1c892549 | 2454 | static int |
c5fab6f4 | 2455 | cifs_read_allocate_pages(struct cifs_readdata *rdata, unsigned int nr_pages) |
1c892549 JL |
2456 | { |
2457 | int rc = 0; | |
c5fab6f4 | 2458 | struct page *page; |
1c892549 JL |
2459 | unsigned int i; |
2460 | ||
c5fab6f4 | 2461 | for (i = 0; i < nr_pages; i++) { |
1c892549 JL |
2462 | page = alloc_page(GFP_KERNEL|__GFP_HIGHMEM); |
2463 | if (!page) { | |
2464 | rc = -ENOMEM; | |
2465 | break; | |
2466 | } | |
c5fab6f4 | 2467 | rdata->pages[i] = page; |
1c892549 JL |
2468 | } |
2469 | ||
2470 | if (rc) { | |
c5fab6f4 JL |
2471 | for (i = 0; i < nr_pages; i++) { |
2472 | put_page(rdata->pages[i]); | |
2473 | rdata->pages[i] = NULL; | |
1c892549 JL |
2474 | } |
2475 | } | |
2476 | return rc; | |
2477 | } | |
2478 | ||
2479 | static void | |
2480 | cifs_uncached_readdata_release(struct kref *refcount) | |
2481 | { | |
1c892549 JL |
2482 | struct cifs_readdata *rdata = container_of(refcount, |
2483 | struct cifs_readdata, refcount); | |
c5fab6f4 | 2484 | unsigned int i; |
1c892549 | 2485 | |
c5fab6f4 JL |
2486 | for (i = 0; i < rdata->nr_pages; i++) { |
2487 | put_page(rdata->pages[i]); | |
2488 | rdata->pages[i] = NULL; | |
1c892549 JL |
2489 | } |
2490 | cifs_readdata_release(refcount); | |
2491 | } | |
2492 | ||
2a1bb138 JL |
2493 | static int |
2494 | cifs_retry_async_readv(struct cifs_readdata *rdata) | |
2495 | { | |
2496 | int rc; | |
fc9c5966 PS |
2497 | struct TCP_Server_Info *server; |
2498 | ||
2499 | server = tlink_tcon(rdata->cfile->tlink)->ses->server; | |
2a1bb138 JL |
2500 | |
2501 | do { | |
2502 | if (rdata->cfile->invalidHandle) { | |
2503 | rc = cifs_reopen_file(rdata->cfile, true); | |
2504 | if (rc != 0) | |
2505 | continue; | |
2506 | } | |
fc9c5966 | 2507 | rc = server->ops->async_readv(rdata); |
2a1bb138 JL |
2508 | } while (rc == -EAGAIN); |
2509 | ||
2510 | return rc; | |
2511 | } | |
2512 | ||
1c892549 JL |
2513 | /** |
2514 | * cifs_readdata_to_iov - copy data from pages in response to an iovec | |
2515 | * @rdata: the readdata response with list of pages holding data | |
2516 | * @iov: vector in which we should copy the data | |
2517 | * @nr_segs: number of segments in vector | |
2518 | * @offset: offset into file of the first iovec | |
2519 | * @copied: used to return the amount of data copied to the iov | |
2520 | * | |
2521 | * This function copies data from a list of pages in a readdata response into | |
2522 | * an array of iovecs. It will first calculate where the data should go | |
2523 | * based on the info in the readdata and then copy the data into that spot. | |
2524 | */ | |
2525 | static ssize_t | |
2526 | cifs_readdata_to_iov(struct cifs_readdata *rdata, const struct iovec *iov, | |
2527 | unsigned long nr_segs, loff_t offset, ssize_t *copied) | |
2528 | { | |
2529 | int rc = 0; | |
2530 | struct iov_iter ii; | |
2531 | size_t pos = rdata->offset - offset; | |
1c892549 JL |
2532 | ssize_t remaining = rdata->bytes; |
2533 | unsigned char *pdata; | |
c5fab6f4 | 2534 | unsigned int i; |
1c892549 JL |
2535 | |
2536 | /* set up iov_iter and advance to the correct offset */ | |
2537 | iov_iter_init(&ii, iov, nr_segs, iov_length(iov, nr_segs), 0); | |
2538 | iov_iter_advance(&ii, pos); | |
2539 | ||
2540 | *copied = 0; | |
c5fab6f4 | 2541 | for (i = 0; i < rdata->nr_pages; i++) { |
1c892549 | 2542 | ssize_t copy; |
c5fab6f4 | 2543 | struct page *page = rdata->pages[i]; |
1c892549 JL |
2544 | |
2545 | /* copy a whole page or whatever's left */ | |
2546 | copy = min_t(ssize_t, remaining, PAGE_SIZE); | |
2547 | ||
2548 | /* ...but limit it to whatever space is left in the iov */ | |
2549 | copy = min_t(ssize_t, copy, iov_iter_count(&ii)); | |
2550 | ||
2551 | /* go while there's data to be copied and no errors */ | |
2552 | if (copy && !rc) { | |
2553 | pdata = kmap(page); | |
2554 | rc = memcpy_toiovecend(ii.iov, pdata, ii.iov_offset, | |
2555 | (int)copy); | |
2556 | kunmap(page); | |
2557 | if (!rc) { | |
2558 | *copied += copy; | |
2559 | remaining -= copy; | |
2560 | iov_iter_advance(&ii, copy); | |
2561 | } | |
2562 | } | |
1c892549 JL |
2563 | } |
2564 | ||
2565 | return rc; | |
2566 | } | |
2567 | ||
2568 | static void | |
2569 | cifs_uncached_readv_complete(struct work_struct *work) | |
2570 | { | |
2571 | struct cifs_readdata *rdata = container_of(work, | |
2572 | struct cifs_readdata, work); | |
1c892549 JL |
2573 | |
2574 | complete(&rdata->done); | |
2575 | kref_put(&rdata->refcount, cifs_uncached_readdata_release); | |
2576 | } | |
2577 | ||
2578 | static int | |
8321fec4 JL |
2579 | cifs_uncached_read_into_pages(struct TCP_Server_Info *server, |
2580 | struct cifs_readdata *rdata, unsigned int len) | |
1c892549 | 2581 | { |
8321fec4 | 2582 | int total_read = 0, result = 0; |
c5fab6f4 JL |
2583 | unsigned int i; |
2584 | unsigned int nr_pages = rdata->nr_pages; | |
8321fec4 | 2585 | struct kvec iov; |
1c892549 | 2586 | |
8321fec4 | 2587 | rdata->tailsz = PAGE_SIZE; |
c5fab6f4 JL |
2588 | for (i = 0; i < nr_pages; i++) { |
2589 | struct page *page = rdata->pages[i]; | |
2590 | ||
8321fec4 | 2591 | if (len >= PAGE_SIZE) { |
1c892549 | 2592 | /* enough data to fill the page */ |
8321fec4 JL |
2593 | iov.iov_base = kmap(page); |
2594 | iov.iov_len = PAGE_SIZE; | |
2595 | cFYI(1, "%u: iov_base=%p iov_len=%zu", | |
2596 | i, iov.iov_base, iov.iov_len); | |
2597 | len -= PAGE_SIZE; | |
2598 | } else if (len > 0) { | |
1c892549 | 2599 | /* enough for partial page, fill and zero the rest */ |
8321fec4 JL |
2600 | iov.iov_base = kmap(page); |
2601 | iov.iov_len = len; | |
2602 | cFYI(1, "%u: iov_base=%p iov_len=%zu", | |
2603 | i, iov.iov_base, iov.iov_len); | |
2604 | memset(iov.iov_base + len, '\0', PAGE_SIZE - len); | |
2605 | rdata->tailsz = len; | |
2606 | len = 0; | |
1c892549 JL |
2607 | } else { |
2608 | /* no need to hold page hostage */ | |
c5fab6f4 JL |
2609 | rdata->pages[i] = NULL; |
2610 | rdata->nr_pages--; | |
1c892549 | 2611 | put_page(page); |
8321fec4 | 2612 | continue; |
1c892549 | 2613 | } |
8321fec4 JL |
2614 | |
2615 | result = cifs_readv_from_socket(server, &iov, 1, iov.iov_len); | |
2616 | kunmap(page); | |
2617 | if (result < 0) | |
2618 | break; | |
2619 | ||
2620 | total_read += result; | |
1c892549 JL |
2621 | } |
2622 | ||
8321fec4 | 2623 | return total_read > 0 ? total_read : result; |
1c892549 JL |
2624 | } |
2625 | ||
a70307ee PS |
2626 | static ssize_t |
2627 | cifs_iovec_read(struct file *file, const struct iovec *iov, | |
2628 | unsigned long nr_segs, loff_t *poffset) | |
1da177e4 | 2629 | { |
1c892549 | 2630 | ssize_t rc; |
a70307ee | 2631 | size_t len, cur_len; |
1c892549 JL |
2632 | ssize_t total_read = 0; |
2633 | loff_t offset = *poffset; | |
2634 | unsigned int npages; | |
1da177e4 | 2635 | struct cifs_sb_info *cifs_sb; |
1c892549 | 2636 | struct cifs_tcon *tcon; |
1da177e4 | 2637 | struct cifsFileInfo *open_file; |
1c892549 JL |
2638 | struct cifs_readdata *rdata, *tmp; |
2639 | struct list_head rdata_list; | |
2640 | pid_t pid; | |
a70307ee PS |
2641 | |
2642 | if (!nr_segs) | |
2643 | return 0; | |
2644 | ||
2645 | len = iov_length(iov, nr_segs); | |
2646 | if (!len) | |
2647 | return 0; | |
1da177e4 | 2648 | |
1c892549 | 2649 | INIT_LIST_HEAD(&rdata_list); |
e6a00296 | 2650 | cifs_sb = CIFS_SB(file->f_path.dentry->d_sb); |
c21dfb69 | 2651 | open_file = file->private_data; |
1c892549 | 2652 | tcon = tlink_tcon(open_file->tlink); |
1da177e4 | 2653 | |
fc9c5966 PS |
2654 | if (!tcon->ses->server->ops->async_readv) |
2655 | return -ENOSYS; | |
2656 | ||
d4ffff1f PS |
2657 | if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_RWPIDFORWARD) |
2658 | pid = open_file->pid; | |
2659 | else | |
2660 | pid = current->tgid; | |
2661 | ||
ad7a2926 | 2662 | if ((file->f_flags & O_ACCMODE) == O_WRONLY) |
b6b38f70 | 2663 | cFYI(1, "attempting read on write only file instance"); |
ad7a2926 | 2664 | |
1c892549 JL |
2665 | do { |
2666 | cur_len = min_t(const size_t, len - total_read, cifs_sb->rsize); | |
2667 | npages = DIV_ROUND_UP(cur_len, PAGE_SIZE); | |
a70307ee | 2668 | |
1c892549 JL |
2669 | /* allocate a readdata struct */ |
2670 | rdata = cifs_readdata_alloc(npages, | |
2671 | cifs_uncached_readv_complete); | |
2672 | if (!rdata) { | |
2673 | rc = -ENOMEM; | |
2674 | goto error; | |
1da177e4 | 2675 | } |
a70307ee | 2676 | |
c5fab6f4 | 2677 | rc = cifs_read_allocate_pages(rdata, npages); |
1c892549 JL |
2678 | if (rc) |
2679 | goto error; | |
2680 | ||
2681 | rdata->cfile = cifsFileInfo_get(open_file); | |
c5fab6f4 | 2682 | rdata->nr_pages = npages; |
1c892549 JL |
2683 | rdata->offset = offset; |
2684 | rdata->bytes = cur_len; | |
2685 | rdata->pid = pid; | |
8321fec4 JL |
2686 | rdata->pagesz = PAGE_SIZE; |
2687 | rdata->read_into_pages = cifs_uncached_read_into_pages; | |
1c892549 JL |
2688 | |
2689 | rc = cifs_retry_async_readv(rdata); | |
2690 | error: | |
2691 | if (rc) { | |
2692 | kref_put(&rdata->refcount, | |
2693 | cifs_uncached_readdata_release); | |
2694 | break; | |
2695 | } | |
2696 | ||
2697 | list_add_tail(&rdata->list, &rdata_list); | |
2698 | offset += cur_len; | |
2699 | len -= cur_len; | |
2700 | } while (len > 0); | |
2701 | ||
2702 | /* if at least one read request send succeeded, then reset rc */ | |
2703 | if (!list_empty(&rdata_list)) | |
2704 | rc = 0; | |
2705 | ||
2706 | /* the loop below should proceed in the order of increasing offsets */ | |
2707 | restart_loop: | |
2708 | list_for_each_entry_safe(rdata, tmp, &rdata_list, list) { | |
2709 | if (!rc) { | |
2710 | ssize_t copied; | |
2711 | ||
2712 | /* FIXME: freezable sleep too? */ | |
2713 | rc = wait_for_completion_killable(&rdata->done); | |
2714 | if (rc) | |
2715 | rc = -EINTR; | |
2716 | else if (rdata->result) | |
2717 | rc = rdata->result; | |
2718 | else { | |
2719 | rc = cifs_readdata_to_iov(rdata, iov, | |
2720 | nr_segs, *poffset, | |
2721 | &copied); | |
2722 | total_read += copied; | |
2723 | } | |
2724 | ||
2725 | /* resend call if it's a retryable error */ | |
2726 | if (rc == -EAGAIN) { | |
2727 | rc = cifs_retry_async_readv(rdata); | |
2728 | goto restart_loop; | |
1da177e4 | 2729 | } |
1da177e4 | 2730 | } |
1c892549 JL |
2731 | list_del_init(&rdata->list); |
2732 | kref_put(&rdata->refcount, cifs_uncached_readdata_release); | |
1da177e4 | 2733 | } |
a70307ee | 2734 | |
1c892549 JL |
2735 | cifs_stats_bytes_read(tcon, total_read); |
2736 | *poffset += total_read; | |
2737 | ||
09a4707e PS |
2738 | /* mask nodata case */ |
2739 | if (rc == -ENODATA) | |
2740 | rc = 0; | |
2741 | ||
1c892549 | 2742 | return total_read ? total_read : rc; |
1da177e4 LT |
2743 | } |
2744 | ||
0b81c1c4 | 2745 | ssize_t cifs_user_readv(struct kiocb *iocb, const struct iovec *iov, |
a70307ee PS |
2746 | unsigned long nr_segs, loff_t pos) |
2747 | { | |
2748 | ssize_t read; | |
2749 | ||
2750 | read = cifs_iovec_read(iocb->ki_filp, iov, nr_segs, &pos); | |
2751 | if (read > 0) | |
2752 | iocb->ki_pos = pos; | |
2753 | ||
2754 | return read; | |
2755 | } | |
2756 | ||
2757 | ssize_t cifs_strict_readv(struct kiocb *iocb, const struct iovec *iov, | |
2758 | unsigned long nr_segs, loff_t pos) | |
2759 | { | |
2760 | struct inode *inode; | |
2761 | ||
2762 | inode = iocb->ki_filp->f_path.dentry->d_inode; | |
2763 | ||
2764 | if (CIFS_I(inode)->clientCanCacheRead) | |
2765 | return generic_file_aio_read(iocb, iov, nr_segs, pos); | |
2766 | ||
2767 | /* | |
2768 | * In strict cache mode we need to read from the server all the time | |
2769 | * if we don't have level II oplock because the server can delay mtime | |
2770 | * change - so we can't make a decision about inode invalidating. | |
2771 | * And we can also fail with pagereading if there are mandatory locks | |
2772 | * on pages affected by this read but not on the region from pos to | |
2773 | * pos+len-1. | |
2774 | */ | |
2775 | ||
2776 | return cifs_user_readv(iocb, iov, nr_segs, pos); | |
2777 | } | |
1da177e4 | 2778 | |
f9c6e234 PS |
2779 | static ssize_t |
2780 | cifs_read(struct file *file, char *read_data, size_t read_size, loff_t *offset) | |
1da177e4 LT |
2781 | { |
2782 | int rc = -EACCES; | |
2783 | unsigned int bytes_read = 0; | |
2784 | unsigned int total_read; | |
2785 | unsigned int current_read_size; | |
5eba8ab3 | 2786 | unsigned int rsize; |
1da177e4 | 2787 | struct cifs_sb_info *cifs_sb; |
29e20f9c | 2788 | struct cifs_tcon *tcon; |
f9c6e234 | 2789 | struct TCP_Server_Info *server; |
6d5786a3 | 2790 | unsigned int xid; |
f9c6e234 | 2791 | char *cur_offset; |
1da177e4 | 2792 | struct cifsFileInfo *open_file; |
d4ffff1f | 2793 | struct cifs_io_parms io_parms; |
ec637e3f | 2794 | int buf_type = CIFS_NO_BUFFER; |
d4ffff1f | 2795 | __u32 pid; |
1da177e4 | 2796 | |
6d5786a3 | 2797 | xid = get_xid(); |
e6a00296 | 2798 | cifs_sb = CIFS_SB(file->f_path.dentry->d_sb); |
1da177e4 | 2799 | |
5eba8ab3 JL |
2800 | /* FIXME: set up handlers for larger reads and/or convert to async */ |
2801 | rsize = min_t(unsigned int, cifs_sb->rsize, CIFSMaxBufSize); | |
2802 | ||
1da177e4 | 2803 | if (file->private_data == NULL) { |
0f3bc09e | 2804 | rc = -EBADF; |
6d5786a3 | 2805 | free_xid(xid); |
0f3bc09e | 2806 | return rc; |
1da177e4 | 2807 | } |
c21dfb69 | 2808 | open_file = file->private_data; |
29e20f9c | 2809 | tcon = tlink_tcon(open_file->tlink); |
f9c6e234 PS |
2810 | server = tcon->ses->server; |
2811 | ||
2812 | if (!server->ops->sync_read) { | |
2813 | free_xid(xid); | |
2814 | return -ENOSYS; | |
2815 | } | |
1da177e4 | 2816 | |
d4ffff1f PS |
2817 | if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_RWPIDFORWARD) |
2818 | pid = open_file->pid; | |
2819 | else | |
2820 | pid = current->tgid; | |
2821 | ||
1da177e4 | 2822 | if ((file->f_flags & O_ACCMODE) == O_WRONLY) |
b6b38f70 | 2823 | cFYI(1, "attempting read on write only file instance"); |
1da177e4 | 2824 | |
f9c6e234 PS |
2825 | for (total_read = 0, cur_offset = read_data; read_size > total_read; |
2826 | total_read += bytes_read, cur_offset += bytes_read) { | |
5eba8ab3 | 2827 | current_read_size = min_t(uint, read_size - total_read, rsize); |
29e20f9c PS |
2828 | /* |
2829 | * For windows me and 9x we do not want to request more than it | |
2830 | * negotiated since it will refuse the read then. | |
2831 | */ | |
2832 | if ((tcon->ses) && !(tcon->ses->capabilities & | |
2833 | tcon->ses->server->vals->cap_large_files)) { | |
7748dd6e | 2834 | current_read_size = min_t(uint, current_read_size, |
c974befa | 2835 | CIFSMaxBufSize); |
f9f5c817 | 2836 | } |
1da177e4 LT |
2837 | rc = -EAGAIN; |
2838 | while (rc == -EAGAIN) { | |
cdff08e7 | 2839 | if (open_file->invalidHandle) { |
15886177 | 2840 | rc = cifs_reopen_file(open_file, true); |
1da177e4 LT |
2841 | if (rc != 0) |
2842 | break; | |
2843 | } | |
d4ffff1f | 2844 | io_parms.pid = pid; |
29e20f9c | 2845 | io_parms.tcon = tcon; |
f9c6e234 | 2846 | io_parms.offset = *offset; |
d4ffff1f | 2847 | io_parms.length = current_read_size; |
f9c6e234 PS |
2848 | rc = server->ops->sync_read(xid, open_file, &io_parms, |
2849 | &bytes_read, &cur_offset, | |
2850 | &buf_type); | |
1da177e4 LT |
2851 | } |
2852 | if (rc || (bytes_read == 0)) { | |
2853 | if (total_read) { | |
2854 | break; | |
2855 | } else { | |
6d5786a3 | 2856 | free_xid(xid); |
1da177e4 LT |
2857 | return rc; |
2858 | } | |
2859 | } else { | |
29e20f9c | 2860 | cifs_stats_bytes_read(tcon, total_read); |
f9c6e234 | 2861 | *offset += bytes_read; |
1da177e4 LT |
2862 | } |
2863 | } | |
6d5786a3 | 2864 | free_xid(xid); |
1da177e4 LT |
2865 | return total_read; |
2866 | } | |
2867 | ||
ca83ce3d JL |
2868 | /* |
2869 | * If the page is mmap'ed into a process' page tables, then we need to make | |
2870 | * sure that it doesn't change while being written back. | |
2871 | */ | |
2872 | static int | |
2873 | cifs_page_mkwrite(struct vm_area_struct *vma, struct vm_fault *vmf) | |
2874 | { | |
2875 | struct page *page = vmf->page; | |
2876 | ||
2877 | lock_page(page); | |
2878 | return VM_FAULT_LOCKED; | |
2879 | } | |
2880 | ||
2881 | static struct vm_operations_struct cifs_file_vm_ops = { | |
2882 | .fault = filemap_fault, | |
2883 | .page_mkwrite = cifs_page_mkwrite, | |
2884 | }; | |
2885 | ||
7a6a19b1 PS |
2886 | int cifs_file_strict_mmap(struct file *file, struct vm_area_struct *vma) |
2887 | { | |
2888 | int rc, xid; | |
2889 | struct inode *inode = file->f_path.dentry->d_inode; | |
2890 | ||
6d5786a3 | 2891 | xid = get_xid(); |
7a6a19b1 | 2892 | |
6feb9891 PS |
2893 | if (!CIFS_I(inode)->clientCanCacheRead) { |
2894 | rc = cifs_invalidate_mapping(inode); | |
2895 | if (rc) | |
2896 | return rc; | |
2897 | } | |
7a6a19b1 PS |
2898 | |
2899 | rc = generic_file_mmap(file, vma); | |
ca83ce3d JL |
2900 | if (rc == 0) |
2901 | vma->vm_ops = &cifs_file_vm_ops; | |
6d5786a3 | 2902 | free_xid(xid); |
7a6a19b1 PS |
2903 | return rc; |
2904 | } | |
2905 | ||
1da177e4 LT |
2906 | int cifs_file_mmap(struct file *file, struct vm_area_struct *vma) |
2907 | { | |
1da177e4 LT |
2908 | int rc, xid; |
2909 | ||
6d5786a3 | 2910 | xid = get_xid(); |
abab095d | 2911 | rc = cifs_revalidate_file(file); |
1da177e4 | 2912 | if (rc) { |
b6b38f70 | 2913 | cFYI(1, "Validation prior to mmap failed, error=%d", rc); |
6d5786a3 | 2914 | free_xid(xid); |
1da177e4 LT |
2915 | return rc; |
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); |
1da177e4 LT |
2921 | return rc; |
2922 | } | |
2923 | ||
0471ca3f JL |
2924 | static void |
2925 | cifs_readv_complete(struct work_struct *work) | |
2926 | { | |
c5fab6f4 | 2927 | unsigned int i; |
0471ca3f JL |
2928 | struct cifs_readdata *rdata = container_of(work, |
2929 | struct cifs_readdata, work); | |
0471ca3f | 2930 | |
c5fab6f4 JL |
2931 | for (i = 0; i < rdata->nr_pages; i++) { |
2932 | struct page *page = rdata->pages[i]; | |
2933 | ||
0471ca3f JL |
2934 | lru_cache_add_file(page); |
2935 | ||
2936 | if (rdata->result == 0) { | |
0471ca3f JL |
2937 | flush_dcache_page(page); |
2938 | SetPageUptodate(page); | |
2939 | } | |
2940 | ||
2941 | unlock_page(page); | |
2942 | ||
2943 | if (rdata->result == 0) | |
2944 | cifs_readpage_to_fscache(rdata->mapping->host, page); | |
2945 | ||
2946 | page_cache_release(page); | |
c5fab6f4 | 2947 | rdata->pages[i] = NULL; |
0471ca3f | 2948 | } |
6993f74a | 2949 | kref_put(&rdata->refcount, cifs_readdata_release); |
0471ca3f JL |
2950 | } |
2951 | ||
8d5ce4d2 | 2952 | static int |
8321fec4 JL |
2953 | cifs_readpages_read_into_pages(struct TCP_Server_Info *server, |
2954 | struct cifs_readdata *rdata, unsigned int len) | |
8d5ce4d2 | 2955 | { |
8321fec4 | 2956 | int total_read = 0, result = 0; |
c5fab6f4 | 2957 | unsigned int i; |
8d5ce4d2 JL |
2958 | u64 eof; |
2959 | pgoff_t eof_index; | |
c5fab6f4 | 2960 | unsigned int nr_pages = rdata->nr_pages; |
8321fec4 | 2961 | struct kvec iov; |
8d5ce4d2 JL |
2962 | |
2963 | /* determine the eof that the server (probably) has */ | |
2964 | eof = CIFS_I(rdata->mapping->host)->server_eof; | |
2965 | eof_index = eof ? (eof - 1) >> PAGE_CACHE_SHIFT : 0; | |
2966 | cFYI(1, "eof=%llu eof_index=%lu", eof, eof_index); | |
2967 | ||
8321fec4 | 2968 | rdata->tailsz = PAGE_CACHE_SIZE; |
c5fab6f4 JL |
2969 | for (i = 0; i < nr_pages; i++) { |
2970 | struct page *page = rdata->pages[i]; | |
2971 | ||
8321fec4 | 2972 | if (len >= PAGE_CACHE_SIZE) { |
8d5ce4d2 | 2973 | /* enough data to fill the page */ |
8321fec4 JL |
2974 | iov.iov_base = kmap(page); |
2975 | iov.iov_len = PAGE_CACHE_SIZE; | |
8d5ce4d2 | 2976 | cFYI(1, "%u: idx=%lu iov_base=%p iov_len=%zu", |
8321fec4 JL |
2977 | i, page->index, iov.iov_base, iov.iov_len); |
2978 | len -= PAGE_CACHE_SIZE; | |
2979 | } else if (len > 0) { | |
8d5ce4d2 | 2980 | /* enough for partial page, fill and zero the rest */ |
8321fec4 JL |
2981 | iov.iov_base = kmap(page); |
2982 | iov.iov_len = len; | |
8d5ce4d2 | 2983 | cFYI(1, "%u: idx=%lu iov_base=%p iov_len=%zu", |
8321fec4 JL |
2984 | i, page->index, iov.iov_base, iov.iov_len); |
2985 | memset(iov.iov_base + len, | |
2986 | '\0', PAGE_CACHE_SIZE - len); | |
2987 | rdata->tailsz = len; | |
2988 | len = 0; | |
8d5ce4d2 JL |
2989 | } else if (page->index > eof_index) { |
2990 | /* | |
2991 | * The VFS will not try to do readahead past the | |
2992 | * i_size, but it's possible that we have outstanding | |
2993 | * writes with gaps in the middle and the i_size hasn't | |
2994 | * caught up yet. Populate those with zeroed out pages | |
2995 | * to prevent the VFS from repeatedly attempting to | |
2996 | * fill them until the writes are flushed. | |
2997 | */ | |
2998 | zero_user(page, 0, PAGE_CACHE_SIZE); | |
8d5ce4d2 JL |
2999 | lru_cache_add_file(page); |
3000 | flush_dcache_page(page); | |
3001 | SetPageUptodate(page); | |
3002 | unlock_page(page); | |
3003 | page_cache_release(page); | |
c5fab6f4 JL |
3004 | rdata->pages[i] = NULL; |
3005 | rdata->nr_pages--; | |
8321fec4 | 3006 | continue; |
8d5ce4d2 JL |
3007 | } else { |
3008 | /* no need to hold page hostage */ | |
8d5ce4d2 JL |
3009 | lru_cache_add_file(page); |
3010 | unlock_page(page); | |
3011 | page_cache_release(page); | |
c5fab6f4 JL |
3012 | rdata->pages[i] = NULL; |
3013 | rdata->nr_pages--; | |
8321fec4 | 3014 | continue; |
8d5ce4d2 | 3015 | } |
8321fec4 JL |
3016 | |
3017 | result = cifs_readv_from_socket(server, &iov, 1, iov.iov_len); | |
3018 | kunmap(page); | |
3019 | if (result < 0) | |
3020 | break; | |
3021 | ||
3022 | total_read += result; | |
8d5ce4d2 JL |
3023 | } |
3024 | ||
8321fec4 | 3025 | return total_read > 0 ? total_read : result; |
8d5ce4d2 JL |
3026 | } |
3027 | ||
1da177e4 LT |
3028 | static int cifs_readpages(struct file *file, struct address_space *mapping, |
3029 | struct list_head *page_list, unsigned num_pages) | |
3030 | { | |
690c5e31 JL |
3031 | int rc; |
3032 | struct list_head tmplist; | |
3033 | struct cifsFileInfo *open_file = file->private_data; | |
3034 | struct cifs_sb_info *cifs_sb = CIFS_SB(file->f_path.dentry->d_sb); | |
3035 | unsigned int rsize = cifs_sb->rsize; | |
3036 | pid_t pid; | |
1da177e4 | 3037 | |
690c5e31 JL |
3038 | /* |
3039 | * Give up immediately if rsize is too small to read an entire page. | |
3040 | * The VFS will fall back to readpage. We should never reach this | |
3041 | * point however since we set ra_pages to 0 when the rsize is smaller | |
3042 | * than a cache page. | |
3043 | */ | |
3044 | if (unlikely(rsize < PAGE_CACHE_SIZE)) | |
3045 | return 0; | |
bfa0d75a | 3046 | |
56698236 SJ |
3047 | /* |
3048 | * Reads as many pages as possible from fscache. Returns -ENOBUFS | |
3049 | * immediately if the cookie is negative | |
3050 | */ | |
3051 | rc = cifs_readpages_from_fscache(mapping->host, mapping, page_list, | |
3052 | &num_pages); | |
3053 | if (rc == 0) | |
690c5e31 | 3054 | return rc; |
56698236 | 3055 | |
d4ffff1f PS |
3056 | if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_RWPIDFORWARD) |
3057 | pid = open_file->pid; | |
3058 | else | |
3059 | pid = current->tgid; | |
3060 | ||
690c5e31 JL |
3061 | rc = 0; |
3062 | INIT_LIST_HEAD(&tmplist); | |
1da177e4 | 3063 | |
690c5e31 JL |
3064 | cFYI(1, "%s: file=%p mapping=%p num_pages=%u", __func__, file, |
3065 | mapping, num_pages); | |
3066 | ||
3067 | /* | |
3068 | * Start with the page at end of list and move it to private | |
3069 | * list. Do the same with any following pages until we hit | |
3070 | * the rsize limit, hit an index discontinuity, or run out of | |
3071 | * pages. Issue the async read and then start the loop again | |
3072 | * until the list is empty. | |
3073 | * | |
3074 | * Note that list order is important. The page_list is in | |
3075 | * the order of declining indexes. When we put the pages in | |
3076 | * the rdata->pages, then we want them in increasing order. | |
3077 | */ | |
3078 | while (!list_empty(page_list)) { | |
c5fab6f4 | 3079 | unsigned int i; |
690c5e31 JL |
3080 | unsigned int bytes = PAGE_CACHE_SIZE; |
3081 | unsigned int expected_index; | |
3082 | unsigned int nr_pages = 1; | |
3083 | loff_t offset; | |
3084 | struct page *page, *tpage; | |
3085 | struct cifs_readdata *rdata; | |
1da177e4 LT |
3086 | |
3087 | page = list_entry(page_list->prev, struct page, lru); | |
690c5e31 JL |
3088 | |
3089 | /* | |
3090 | * Lock the page and put it in the cache. Since no one else | |
3091 | * should have access to this page, we're safe to simply set | |
3092 | * PG_locked without checking it first. | |
3093 | */ | |
3094 | __set_page_locked(page); | |
3095 | rc = add_to_page_cache_locked(page, mapping, | |
3096 | page->index, GFP_KERNEL); | |
3097 | ||
3098 | /* give up if we can't stick it in the cache */ | |
3099 | if (rc) { | |
3100 | __clear_page_locked(page); | |
3101 | break; | |
3102 | } | |
3103 | ||
3104 | /* move first page to the tmplist */ | |
1da177e4 | 3105 | offset = (loff_t)page->index << PAGE_CACHE_SHIFT; |
690c5e31 | 3106 | list_move_tail(&page->lru, &tmplist); |
1da177e4 | 3107 | |
690c5e31 JL |
3108 | /* now try and add more pages onto the request */ |
3109 | expected_index = page->index + 1; | |
3110 | list_for_each_entry_safe_reverse(page, tpage, page_list, lru) { | |
3111 | /* discontinuity ? */ | |
3112 | if (page->index != expected_index) | |
fb8c4b14 | 3113 | break; |
690c5e31 JL |
3114 | |
3115 | /* would this page push the read over the rsize? */ | |
3116 | if (bytes + PAGE_CACHE_SIZE > rsize) | |
3117 | break; | |
3118 | ||
3119 | __set_page_locked(page); | |
3120 | if (add_to_page_cache_locked(page, mapping, | |
3121 | page->index, GFP_KERNEL)) { | |
3122 | __clear_page_locked(page); | |
3123 | break; | |
3124 | } | |
3125 | list_move_tail(&page->lru, &tmplist); | |
3126 | bytes += PAGE_CACHE_SIZE; | |
3127 | expected_index++; | |
3128 | nr_pages++; | |
1da177e4 | 3129 | } |
690c5e31 | 3130 | |
0471ca3f | 3131 | rdata = cifs_readdata_alloc(nr_pages, cifs_readv_complete); |
690c5e31 JL |
3132 | if (!rdata) { |
3133 | /* best to give up if we're out of mem */ | |
3134 | list_for_each_entry_safe(page, tpage, &tmplist, lru) { | |
3135 | list_del(&page->lru); | |
3136 | lru_cache_add_file(page); | |
3137 | unlock_page(page); | |
3138 | page_cache_release(page); | |
3139 | } | |
3140 | rc = -ENOMEM; | |
3141 | break; | |
3142 | } | |
3143 | ||
6993f74a | 3144 | rdata->cfile = cifsFileInfo_get(open_file); |
690c5e31 JL |
3145 | rdata->mapping = mapping; |
3146 | rdata->offset = offset; | |
3147 | rdata->bytes = bytes; | |
3148 | rdata->pid = pid; | |
8321fec4 JL |
3149 | rdata->pagesz = PAGE_CACHE_SIZE; |
3150 | rdata->read_into_pages = cifs_readpages_read_into_pages; | |
c5fab6f4 JL |
3151 | |
3152 | list_for_each_entry_safe(page, tpage, &tmplist, lru) { | |
3153 | list_del(&page->lru); | |
3154 | rdata->pages[rdata->nr_pages++] = page; | |
3155 | } | |
690c5e31 | 3156 | |
2a1bb138 | 3157 | rc = cifs_retry_async_readv(rdata); |
690c5e31 | 3158 | if (rc != 0) { |
c5fab6f4 JL |
3159 | for (i = 0; i < rdata->nr_pages; i++) { |
3160 | page = rdata->pages[i]; | |
690c5e31 JL |
3161 | lru_cache_add_file(page); |
3162 | unlock_page(page); | |
3163 | page_cache_release(page); | |
1da177e4 | 3164 | } |
6993f74a | 3165 | kref_put(&rdata->refcount, cifs_readdata_release); |
1da177e4 LT |
3166 | break; |
3167 | } | |
6993f74a JL |
3168 | |
3169 | kref_put(&rdata->refcount, cifs_readdata_release); | |
1da177e4 LT |
3170 | } |
3171 | ||
1da177e4 LT |
3172 | return rc; |
3173 | } | |
3174 | ||
3175 | static int cifs_readpage_worker(struct file *file, struct page *page, | |
3176 | loff_t *poffset) | |
3177 | { | |
3178 | char *read_data; | |
3179 | int rc; | |
3180 | ||
56698236 SJ |
3181 | /* Is the page cached? */ |
3182 | rc = cifs_readpage_from_fscache(file->f_path.dentry->d_inode, page); | |
3183 | if (rc == 0) | |
3184 | goto read_complete; | |
3185 | ||
1da177e4 LT |
3186 | page_cache_get(page); |
3187 | read_data = kmap(page); | |
3188 | /* for reads over a certain size could initiate async read ahead */ | |
fb8c4b14 | 3189 | |
1da177e4 | 3190 | rc = cifs_read(file, read_data, PAGE_CACHE_SIZE, poffset); |
fb8c4b14 | 3191 | |
1da177e4 LT |
3192 | if (rc < 0) |
3193 | goto io_error; | |
3194 | else | |
b6b38f70 | 3195 | cFYI(1, "Bytes read %d", rc); |
fb8c4b14 | 3196 | |
e6a00296 JJS |
3197 | file->f_path.dentry->d_inode->i_atime = |
3198 | current_fs_time(file->f_path.dentry->d_inode->i_sb); | |
fb8c4b14 | 3199 | |
1da177e4 LT |
3200 | if (PAGE_CACHE_SIZE > rc) |
3201 | memset(read_data + rc, 0, PAGE_CACHE_SIZE - rc); | |
3202 | ||
3203 | flush_dcache_page(page); | |
3204 | SetPageUptodate(page); | |
9dc06558 SJ |
3205 | |
3206 | /* send this page to the cache */ | |
3207 | cifs_readpage_to_fscache(file->f_path.dentry->d_inode, page); | |
3208 | ||
1da177e4 | 3209 | rc = 0; |
fb8c4b14 | 3210 | |
1da177e4 | 3211 | io_error: |
fb8c4b14 | 3212 | kunmap(page); |
1da177e4 | 3213 | page_cache_release(page); |
56698236 SJ |
3214 | |
3215 | read_complete: | |
1da177e4 LT |
3216 | return rc; |
3217 | } | |
3218 | ||
3219 | static int cifs_readpage(struct file *file, struct page *page) | |
3220 | { | |
3221 | loff_t offset = (loff_t)page->index << PAGE_CACHE_SHIFT; | |
3222 | int rc = -EACCES; | |
6d5786a3 | 3223 | unsigned int xid; |
1da177e4 | 3224 | |
6d5786a3 | 3225 | xid = get_xid(); |
1da177e4 LT |
3226 | |
3227 | if (file->private_data == NULL) { | |
0f3bc09e | 3228 | rc = -EBADF; |
6d5786a3 | 3229 | free_xid(xid); |
0f3bc09e | 3230 | return rc; |
1da177e4 LT |
3231 | } |
3232 | ||
ac3aa2f8 | 3233 | cFYI(1, "readpage %p at offset %d 0x%x", |
b6b38f70 | 3234 | page, (int)offset, (int)offset); |
1da177e4 LT |
3235 | |
3236 | rc = cifs_readpage_worker(file, page, &offset); | |
3237 | ||
3238 | unlock_page(page); | |
3239 | ||
6d5786a3 | 3240 | free_xid(xid); |
1da177e4 LT |
3241 | return rc; |
3242 | } | |
3243 | ||
a403a0a3 SF |
3244 | static int is_inode_writable(struct cifsInodeInfo *cifs_inode) |
3245 | { | |
3246 | struct cifsFileInfo *open_file; | |
3247 | ||
4477288a | 3248 | spin_lock(&cifs_file_list_lock); |
a403a0a3 | 3249 | list_for_each_entry(open_file, &cifs_inode->openFileList, flist) { |
2e396b83 | 3250 | if (OPEN_FMODE(open_file->f_flags) & FMODE_WRITE) { |
4477288a | 3251 | spin_unlock(&cifs_file_list_lock); |
a403a0a3 SF |
3252 | return 1; |
3253 | } | |
3254 | } | |
4477288a | 3255 | spin_unlock(&cifs_file_list_lock); |
a403a0a3 SF |
3256 | return 0; |
3257 | } | |
3258 | ||
1da177e4 LT |
3259 | /* We do not want to update the file size from server for inodes |
3260 | open for write - to avoid races with writepage extending | |
3261 | the file - in the future we could consider allowing | |
fb8c4b14 | 3262 | refreshing the inode only on increases in the file size |
1da177e4 LT |
3263 | but this is tricky to do without racing with writebehind |
3264 | page caching in the current Linux kernel design */ | |
4b18f2a9 | 3265 | bool is_size_safe_to_change(struct cifsInodeInfo *cifsInode, __u64 end_of_file) |
1da177e4 | 3266 | { |
a403a0a3 | 3267 | if (!cifsInode) |
4b18f2a9 | 3268 | return true; |
50c2f753 | 3269 | |
a403a0a3 SF |
3270 | if (is_inode_writable(cifsInode)) { |
3271 | /* This inode is open for write at least once */ | |
c32a0b68 SF |
3272 | struct cifs_sb_info *cifs_sb; |
3273 | ||
c32a0b68 | 3274 | cifs_sb = CIFS_SB(cifsInode->vfs_inode.i_sb); |
ad7a2926 | 3275 | if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DIRECT_IO) { |
fb8c4b14 | 3276 | /* since no page cache to corrupt on directio |
c32a0b68 | 3277 | we can change size safely */ |
4b18f2a9 | 3278 | return true; |
c32a0b68 SF |
3279 | } |
3280 | ||
fb8c4b14 | 3281 | if (i_size_read(&cifsInode->vfs_inode) < end_of_file) |
4b18f2a9 | 3282 | return true; |
7ba52631 | 3283 | |
4b18f2a9 | 3284 | return false; |
23e7dd7d | 3285 | } else |
4b18f2a9 | 3286 | return true; |
1da177e4 LT |
3287 | } |
3288 | ||
d9414774 NP |
3289 | static int cifs_write_begin(struct file *file, struct address_space *mapping, |
3290 | loff_t pos, unsigned len, unsigned flags, | |
3291 | struct page **pagep, void **fsdata) | |
1da177e4 | 3292 | { |
d9414774 NP |
3293 | pgoff_t index = pos >> PAGE_CACHE_SHIFT; |
3294 | loff_t offset = pos & (PAGE_CACHE_SIZE - 1); | |
a98ee8c1 JL |
3295 | loff_t page_start = pos & PAGE_MASK; |
3296 | loff_t i_size; | |
3297 | struct page *page; | |
3298 | int rc = 0; | |
d9414774 | 3299 | |
b6b38f70 | 3300 | cFYI(1, "write_begin from %lld len %d", (long long)pos, len); |
d9414774 | 3301 | |
54566b2c | 3302 | page = grab_cache_page_write_begin(mapping, index, flags); |
a98ee8c1 JL |
3303 | if (!page) { |
3304 | rc = -ENOMEM; | |
3305 | goto out; | |
3306 | } | |
8a236264 | 3307 | |
a98ee8c1 JL |
3308 | if (PageUptodate(page)) |
3309 | goto out; | |
8a236264 | 3310 | |
a98ee8c1 JL |
3311 | /* |
3312 | * If we write a full page it will be up to date, no need to read from | |
3313 | * the server. If the write is short, we'll end up doing a sync write | |
3314 | * instead. | |
3315 | */ | |
3316 | if (len == PAGE_CACHE_SIZE) | |
3317 | goto out; | |
8a236264 | 3318 | |
a98ee8c1 JL |
3319 | /* |
3320 | * optimize away the read when we have an oplock, and we're not | |
3321 | * expecting to use any of the data we'd be reading in. That | |
3322 | * is, when the page lies beyond the EOF, or straddles the EOF | |
3323 | * and the write will cover all of the existing data. | |
3324 | */ | |
3325 | if (CIFS_I(mapping->host)->clientCanCacheRead) { | |
3326 | i_size = i_size_read(mapping->host); | |
3327 | if (page_start >= i_size || | |
3328 | (offset == 0 && (pos + len) >= i_size)) { | |
3329 | zero_user_segments(page, 0, offset, | |
3330 | offset + len, | |
3331 | PAGE_CACHE_SIZE); | |
3332 | /* | |
3333 | * PageChecked means that the parts of the page | |
3334 | * to which we're not writing are considered up | |
3335 | * to date. Once the data is copied to the | |
3336 | * page, it can be set uptodate. | |
3337 | */ | |
3338 | SetPageChecked(page); | |
3339 | goto out; | |
3340 | } | |
3341 | } | |
d9414774 | 3342 | |
a98ee8c1 JL |
3343 | if ((file->f_flags & O_ACCMODE) != O_WRONLY) { |
3344 | /* | |
3345 | * might as well read a page, it is fast enough. If we get | |
3346 | * an error, we don't need to return it. cifs_write_end will | |
3347 | * do a sync write instead since PG_uptodate isn't set. | |
3348 | */ | |
3349 | cifs_readpage_worker(file, page, &page_start); | |
8a236264 SF |
3350 | } else { |
3351 | /* we could try using another file handle if there is one - | |
3352 | but how would we lock it to prevent close of that handle | |
3353 | racing with this read? In any case | |
d9414774 | 3354 | this will be written out by write_end so is fine */ |
1da177e4 | 3355 | } |
a98ee8c1 JL |
3356 | out: |
3357 | *pagep = page; | |
3358 | return rc; | |
1da177e4 LT |
3359 | } |
3360 | ||
85f2d6b4 SJ |
3361 | static int cifs_release_page(struct page *page, gfp_t gfp) |
3362 | { | |
3363 | if (PagePrivate(page)) | |
3364 | return 0; | |
3365 | ||
3366 | return cifs_fscache_release_page(page, gfp); | |
3367 | } | |
3368 | ||
3369 | static void cifs_invalidate_page(struct page *page, unsigned long offset) | |
3370 | { | |
3371 | struct cifsInodeInfo *cifsi = CIFS_I(page->mapping->host); | |
3372 | ||
3373 | if (offset == 0) | |
3374 | cifs_fscache_invalidate_page(page, &cifsi->vfs_inode); | |
3375 | } | |
3376 | ||
9ad1506b PS |
3377 | static int cifs_launder_page(struct page *page) |
3378 | { | |
3379 | int rc = 0; | |
3380 | loff_t range_start = page_offset(page); | |
3381 | loff_t range_end = range_start + (loff_t)(PAGE_CACHE_SIZE - 1); | |
3382 | struct writeback_control wbc = { | |
3383 | .sync_mode = WB_SYNC_ALL, | |
3384 | .nr_to_write = 0, | |
3385 | .range_start = range_start, | |
3386 | .range_end = range_end, | |
3387 | }; | |
3388 | ||
3389 | cFYI(1, "Launder page: %p", page); | |
3390 | ||
3391 | if (clear_page_dirty_for_io(page)) | |
3392 | rc = cifs_writepage_locked(page, &wbc); | |
3393 | ||
3394 | cifs_fscache_invalidate_page(page, page->mapping->host); | |
3395 | return rc; | |
3396 | } | |
3397 | ||
9b646972 | 3398 | void cifs_oplock_break(struct work_struct *work) |
3bc303c2 JL |
3399 | { |
3400 | struct cifsFileInfo *cfile = container_of(work, struct cifsFileInfo, | |
3401 | oplock_break); | |
a5e18bc3 | 3402 | struct inode *inode = cfile->dentry->d_inode; |
3bc303c2 | 3403 | struct cifsInodeInfo *cinode = CIFS_I(inode); |
95a3f2f3 | 3404 | struct cifs_tcon *tcon = tlink_tcon(cfile->tlink); |
eb4b756b | 3405 | int rc = 0; |
3bc303c2 JL |
3406 | |
3407 | if (inode && S_ISREG(inode->i_mode)) { | |
d54ff732 | 3408 | if (cinode->clientCanCacheRead) |
8737c930 | 3409 | break_lease(inode, O_RDONLY); |
d54ff732 | 3410 | else |
8737c930 | 3411 | break_lease(inode, O_WRONLY); |
3bc303c2 JL |
3412 | rc = filemap_fdatawrite(inode->i_mapping); |
3413 | if (cinode->clientCanCacheRead == 0) { | |
eb4b756b JL |
3414 | rc = filemap_fdatawait(inode->i_mapping); |
3415 | mapping_set_error(inode->i_mapping, rc); | |
3bc303c2 JL |
3416 | invalidate_remote_inode(inode); |
3417 | } | |
b6b38f70 | 3418 | cFYI(1, "Oplock flush inode %p rc %d", inode, rc); |
3bc303c2 JL |
3419 | } |
3420 | ||
85160e03 PS |
3421 | rc = cifs_push_locks(cfile); |
3422 | if (rc) | |
3423 | cERROR(1, "Push locks rc = %d", rc); | |
3424 | ||
3bc303c2 JL |
3425 | /* |
3426 | * releasing stale oplock after recent reconnect of smb session using | |
3427 | * a now incorrect file handle is not a data integrity issue but do | |
3428 | * not bother sending an oplock release if session to server still is | |
3429 | * disconnected since oplock already released by the server | |
3430 | */ | |
cdff08e7 | 3431 | if (!cfile->oplock_break_cancelled) { |
95a3f2f3 PS |
3432 | rc = tcon->ses->server->ops->oplock_response(tcon, &cfile->fid, |
3433 | cinode); | |
b6b38f70 | 3434 | cFYI(1, "Oplock release rc = %d", rc); |
3bc303c2 | 3435 | } |
3bc303c2 JL |
3436 | } |
3437 | ||
f5e54d6e | 3438 | const struct address_space_operations cifs_addr_ops = { |
1da177e4 LT |
3439 | .readpage = cifs_readpage, |
3440 | .readpages = cifs_readpages, | |
3441 | .writepage = cifs_writepage, | |
37c0eb46 | 3442 | .writepages = cifs_writepages, |
d9414774 NP |
3443 | .write_begin = cifs_write_begin, |
3444 | .write_end = cifs_write_end, | |
1da177e4 | 3445 | .set_page_dirty = __set_page_dirty_nobuffers, |
85f2d6b4 SJ |
3446 | .releasepage = cifs_release_page, |
3447 | .invalidatepage = cifs_invalidate_page, | |
9ad1506b | 3448 | .launder_page = cifs_launder_page, |
1da177e4 | 3449 | }; |
273d81d6 DK |
3450 | |
3451 | /* | |
3452 | * cifs_readpages requires the server to support a buffer large enough to | |
3453 | * contain the header plus one complete page of data. Otherwise, we need | |
3454 | * to leave cifs_readpages out of the address space operations. | |
3455 | */ | |
f5e54d6e | 3456 | const struct address_space_operations cifs_addr_ops_smallbuf = { |
273d81d6 DK |
3457 | .readpage = cifs_readpage, |
3458 | .writepage = cifs_writepage, | |
3459 | .writepages = cifs_writepages, | |
d9414774 NP |
3460 | .write_begin = cifs_write_begin, |
3461 | .write_end = cifs_write_end, | |
273d81d6 | 3462 | .set_page_dirty = __set_page_dirty_nobuffers, |
85f2d6b4 SJ |
3463 | .releasepage = cifs_release_page, |
3464 | .invalidatepage = cifs_invalidate_page, | |
9ad1506b | 3465 | .launder_page = cifs_launder_page, |
273d81d6 | 3466 | }; |