Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* |
2 | * fs/cifs/file.c | |
3 | * | |
4 | * vfs operations that deal with files | |
fb8c4b14 | 5 | * |
f19159dc | 6 | * Copyright (C) International Business Machines Corp., 2002,2010 |
1da177e4 | 7 | * Author(s): Steve French (sfrench@us.ibm.com) |
7ee1af76 | 8 | * Jeremy Allison (jra@samba.org) |
1da177e4 LT |
9 | * |
10 | * This library is free software; you can redistribute it and/or modify | |
11 | * it under the terms of the GNU Lesser General Public License as published | |
12 | * by the Free Software Foundation; either version 2.1 of the License, or | |
13 | * (at your option) any later version. | |
14 | * | |
15 | * This library is distributed in the hope that it will be useful, | |
16 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
17 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See | |
18 | * the GNU Lesser General Public License for more details. | |
19 | * | |
20 | * You should have received a copy of the GNU Lesser General Public License | |
21 | * along with this library; if not, write to the Free Software | |
22 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA | |
23 | */ | |
24 | #include <linux/fs.h> | |
37c0eb46 | 25 | #include <linux/backing-dev.h> |
1da177e4 LT |
26 | #include <linux/stat.h> |
27 | #include <linux/fcntl.h> | |
28 | #include <linux/pagemap.h> | |
29 | #include <linux/pagevec.h> | |
37c0eb46 | 30 | #include <linux/writeback.h> |
6f88cc2e | 31 | #include <linux/task_io_accounting_ops.h> |
23e7dd7d | 32 | #include <linux/delay.h> |
3bc303c2 | 33 | #include <linux/mount.h> |
5a0e3ad6 | 34 | #include <linux/slab.h> |
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 | 179 | FILE_ALL_INFO *buf; |
b8c32dbb | 180 | struct TCP_Server_Info *server = tcon->ses->server; |
eeb910a6 | 181 | |
b8c32dbb | 182 | if (!server->ops->open) |
fb1214e4 PS |
183 | return -ENOSYS; |
184 | ||
185 | desired_access = cifs_convert_flags(f_flags); | |
eeb910a6 PS |
186 | |
187 | /********************************************************************* | |
188 | * open flag mapping table: | |
189 | * | |
190 | * POSIX Flag CIFS Disposition | |
191 | * ---------- ---------------- | |
192 | * O_CREAT FILE_OPEN_IF | |
193 | * O_CREAT | O_EXCL FILE_CREATE | |
194 | * O_CREAT | O_TRUNC FILE_OVERWRITE_IF | |
195 | * O_TRUNC FILE_OVERWRITE | |
196 | * none of the above FILE_OPEN | |
197 | * | |
198 | * Note that there is not a direct match between disposition | |
199 | * FILE_SUPERSEDE (ie create whether or not file exists although | |
200 | * O_CREAT | O_TRUNC is similar but truncates the existing | |
201 | * file rather than creating a new file as FILE_SUPERSEDE does | |
202 | * (which uses the attributes / metadata passed in on open call) | |
203 | *? | |
204 | *? O_SYNC is a reasonable match to CIFS writethrough flag | |
205 | *? and the read write flags match reasonably. O_LARGEFILE | |
206 | *? is irrelevant because largefile support is always used | |
207 | *? by this client. Flags O_APPEND, O_DIRECT, O_DIRECTORY, | |
208 | * O_FASYNC, O_NOFOLLOW, O_NONBLOCK need further investigation | |
209 | *********************************************************************/ | |
210 | ||
211 | disposition = cifs_get_disposition(f_flags); | |
212 | ||
213 | /* BB pass O_SYNC flag through on file attributes .. BB */ | |
214 | ||
215 | buf = kmalloc(sizeof(FILE_ALL_INFO), GFP_KERNEL); | |
216 | if (!buf) | |
217 | return -ENOMEM; | |
218 | ||
3d3ea8e6 SP |
219 | if (backup_cred(cifs_sb)) |
220 | create_options |= CREATE_OPEN_BACKUP_INTENT; | |
221 | ||
b8c32dbb PS |
222 | rc = server->ops->open(xid, tcon, full_path, disposition, |
223 | desired_access, create_options, fid, oplock, buf, | |
224 | cifs_sb); | |
eeb910a6 PS |
225 | |
226 | if (rc) | |
227 | goto out; | |
228 | ||
229 | if (tcon->unix_ext) | |
230 | rc = cifs_get_inode_info_unix(&inode, full_path, inode->i_sb, | |
231 | xid); | |
232 | else | |
233 | rc = cifs_get_inode_info(&inode, full_path, buf, inode->i_sb, | |
fb1214e4 | 234 | xid, &fid->netfid); |
eeb910a6 PS |
235 | |
236 | out: | |
237 | kfree(buf); | |
238 | return rc; | |
239 | } | |
240 | ||
15ecb436 | 241 | struct cifsFileInfo * |
fb1214e4 | 242 | cifs_new_fileinfo(struct cifs_fid *fid, struct file *file, |
15ecb436 JL |
243 | struct tcon_link *tlink, __u32 oplock) |
244 | { | |
245 | struct dentry *dentry = file->f_path.dentry; | |
246 | struct inode *inode = dentry->d_inode; | |
4b4de76e PS |
247 | struct cifsInodeInfo *cinode = CIFS_I(inode); |
248 | struct cifsFileInfo *cfile; | |
f45d3416 | 249 | struct cifs_fid_locks *fdlocks; |
233839b1 | 250 | struct cifs_tcon *tcon = tlink_tcon(tlink); |
4b4de76e PS |
251 | |
252 | cfile = kzalloc(sizeof(struct cifsFileInfo), GFP_KERNEL); | |
253 | if (cfile == NULL) | |
254 | return cfile; | |
255 | ||
f45d3416 PS |
256 | fdlocks = kzalloc(sizeof(struct cifs_fid_locks), GFP_KERNEL); |
257 | if (!fdlocks) { | |
258 | kfree(cfile); | |
259 | return NULL; | |
260 | } | |
261 | ||
262 | INIT_LIST_HEAD(&fdlocks->locks); | |
263 | fdlocks->cfile = cfile; | |
264 | cfile->llist = fdlocks; | |
1b4b55a1 | 265 | down_write(&cinode->lock_sem); |
f45d3416 | 266 | list_add(&fdlocks->llist, &cinode->llist); |
1b4b55a1 | 267 | up_write(&cinode->lock_sem); |
f45d3416 | 268 | |
4b4de76e | 269 | cfile->count = 1; |
4b4de76e PS |
270 | cfile->pid = current->tgid; |
271 | cfile->uid = current_fsuid(); | |
272 | cfile->dentry = dget(dentry); | |
273 | cfile->f_flags = file->f_flags; | |
274 | cfile->invalidHandle = false; | |
275 | cfile->tlink = cifs_get_tlink(tlink); | |
4b4de76e | 276 | INIT_WORK(&cfile->oplock_break, cifs_oplock_break); |
f45d3416 | 277 | mutex_init(&cfile->fh_mutex); |
15ecb436 | 278 | |
4477288a | 279 | spin_lock(&cifs_file_list_lock); |
233839b1 PS |
280 | if (fid->pending_open->oplock != CIFS_OPLOCK_NO_CHANGE) |
281 | oplock = fid->pending_open->oplock; | |
282 | list_del(&fid->pending_open->olist); | |
283 | ||
284 | tlink_tcon(tlink)->ses->server->ops->set_fid(cfile, fid, oplock); | |
285 | ||
286 | list_add(&cfile->tlist, &tcon->openFileList); | |
15ecb436 JL |
287 | /* if readable file instance put first in list*/ |
288 | if (file->f_mode & FMODE_READ) | |
4b4de76e | 289 | list_add(&cfile->flist, &cinode->openFileList); |
15ecb436 | 290 | else |
4b4de76e | 291 | list_add_tail(&cfile->flist, &cinode->openFileList); |
4477288a | 292 | spin_unlock(&cifs_file_list_lock); |
15ecb436 | 293 | |
4b4de76e PS |
294 | file->private_data = cfile; |
295 | return cfile; | |
15ecb436 JL |
296 | } |
297 | ||
764a1b1a JL |
298 | struct cifsFileInfo * |
299 | cifsFileInfo_get(struct cifsFileInfo *cifs_file) | |
300 | { | |
301 | spin_lock(&cifs_file_list_lock); | |
302 | cifsFileInfo_get_locked(cifs_file); | |
303 | spin_unlock(&cifs_file_list_lock); | |
304 | return cifs_file; | |
305 | } | |
306 | ||
cdff08e7 SF |
307 | /* |
308 | * Release a reference on the file private data. This may involve closing | |
5f6dbc9e JL |
309 | * the filehandle out on the server. Must be called without holding |
310 | * cifs_file_list_lock. | |
cdff08e7 | 311 | */ |
b33879aa JL |
312 | void cifsFileInfo_put(struct cifsFileInfo *cifs_file) |
313 | { | |
e66673e3 | 314 | struct inode *inode = cifs_file->dentry->d_inode; |
96daf2b0 | 315 | struct cifs_tcon *tcon = tlink_tcon(cifs_file->tlink); |
233839b1 | 316 | struct TCP_Server_Info *server = tcon->ses->server; |
e66673e3 | 317 | struct cifsInodeInfo *cifsi = CIFS_I(inode); |
4f8ba8a0 | 318 | struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb); |
cdff08e7 | 319 | struct cifsLockInfo *li, *tmp; |
233839b1 PS |
320 | struct cifs_fid fid; |
321 | struct cifs_pending_open open; | |
cdff08e7 SF |
322 | |
323 | spin_lock(&cifs_file_list_lock); | |
5f6dbc9e | 324 | if (--cifs_file->count > 0) { |
cdff08e7 SF |
325 | spin_unlock(&cifs_file_list_lock); |
326 | return; | |
327 | } | |
328 | ||
233839b1 PS |
329 | if (server->ops->get_lease_key) |
330 | server->ops->get_lease_key(inode, &fid); | |
331 | ||
332 | /* store open in pending opens to make sure we don't miss lease break */ | |
333 | cifs_add_pending_open_locked(&fid, cifs_file->tlink, &open); | |
334 | ||
cdff08e7 SF |
335 | /* remove it from the lists */ |
336 | list_del(&cifs_file->flist); | |
337 | list_del(&cifs_file->tlist); | |
338 | ||
339 | if (list_empty(&cifsi->openFileList)) { | |
340 | cFYI(1, "closing last open instance for inode %p", | |
341 | cifs_file->dentry->d_inode); | |
25364138 PS |
342 | /* |
343 | * In strict cache mode we need invalidate mapping on the last | |
344 | * close because it may cause a error when we open this file | |
345 | * again and get at least level II oplock. | |
346 | */ | |
4f8ba8a0 PS |
347 | if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_STRICT_IO) |
348 | CIFS_I(inode)->invalid_mapping = true; | |
c6723628 | 349 | cifs_set_oplock_level(cifsi, 0); |
cdff08e7 SF |
350 | } |
351 | spin_unlock(&cifs_file_list_lock); | |
352 | ||
ad635942 JL |
353 | cancel_work_sync(&cifs_file->oplock_break); |
354 | ||
cdff08e7 | 355 | if (!tcon->need_reconnect && !cifs_file->invalidHandle) { |
0ff78a22 | 356 | struct TCP_Server_Info *server = tcon->ses->server; |
6d5786a3 | 357 | unsigned int xid; |
0ff78a22 | 358 | |
6d5786a3 | 359 | xid = get_xid(); |
0ff78a22 | 360 | if (server->ops->close) |
760ad0ca PS |
361 | server->ops->close(xid, tcon, &cifs_file->fid); |
362 | _free_xid(xid); | |
cdff08e7 SF |
363 | } |
364 | ||
233839b1 PS |
365 | cifs_del_pending_open(&open); |
366 | ||
f45d3416 PS |
367 | /* |
368 | * Delete any outstanding lock records. We'll lose them when the file | |
cdff08e7 SF |
369 | * is closed anyway. |
370 | */ | |
1b4b55a1 | 371 | down_write(&cifsi->lock_sem); |
f45d3416 | 372 | list_for_each_entry_safe(li, tmp, &cifs_file->llist->locks, llist) { |
cdff08e7 | 373 | list_del(&li->llist); |
85160e03 | 374 | cifs_del_lock_waiters(li); |
cdff08e7 | 375 | kfree(li); |
b33879aa | 376 | } |
f45d3416 PS |
377 | list_del(&cifs_file->llist->llist); |
378 | kfree(cifs_file->llist); | |
1b4b55a1 | 379 | up_write(&cifsi->lock_sem); |
cdff08e7 SF |
380 | |
381 | cifs_put_tlink(cifs_file->tlink); | |
382 | dput(cifs_file->dentry); | |
383 | kfree(cifs_file); | |
b33879aa JL |
384 | } |
385 | ||
1da177e4 | 386 | int cifs_open(struct inode *inode, struct file *file) |
233839b1 | 387 | |
1da177e4 LT |
388 | { |
389 | int rc = -EACCES; | |
6d5786a3 | 390 | unsigned int xid; |
590a3fe0 | 391 | __u32 oplock; |
1da177e4 | 392 | struct cifs_sb_info *cifs_sb; |
b8c32dbb | 393 | struct TCP_Server_Info *server; |
96daf2b0 | 394 | struct cifs_tcon *tcon; |
7ffec372 | 395 | struct tcon_link *tlink; |
fb1214e4 | 396 | struct cifsFileInfo *cfile = NULL; |
1da177e4 | 397 | char *full_path = NULL; |
7e12eddb | 398 | bool posix_open_ok = false; |
fb1214e4 | 399 | struct cifs_fid fid; |
233839b1 | 400 | struct cifs_pending_open open; |
1da177e4 | 401 | |
6d5786a3 | 402 | xid = get_xid(); |
1da177e4 LT |
403 | |
404 | cifs_sb = CIFS_SB(inode->i_sb); | |
7ffec372 JL |
405 | tlink = cifs_sb_tlink(cifs_sb); |
406 | if (IS_ERR(tlink)) { | |
6d5786a3 | 407 | free_xid(xid); |
7ffec372 JL |
408 | return PTR_ERR(tlink); |
409 | } | |
410 | tcon = tlink_tcon(tlink); | |
b8c32dbb | 411 | server = tcon->ses->server; |
1da177e4 | 412 | |
e6a00296 | 413 | full_path = build_path_from_dentry(file->f_path.dentry); |
1da177e4 | 414 | if (full_path == NULL) { |
0f3bc09e | 415 | rc = -ENOMEM; |
232341ba | 416 | goto out; |
1da177e4 LT |
417 | } |
418 | ||
b6b38f70 JP |
419 | cFYI(1, "inode = 0x%p file flags are 0x%x for %s", |
420 | inode, file->f_flags, full_path); | |
276a74a4 | 421 | |
233839b1 | 422 | if (server->oplocks) |
276a74a4 SF |
423 | oplock = REQ_OPLOCK; |
424 | else | |
425 | oplock = 0; | |
426 | ||
64cc2c63 | 427 | if (!tcon->broken_posix_open && tcon->unix_ext && |
29e20f9c PS |
428 | cap_unix(tcon->ses) && (CIFS_UNIX_POSIX_PATH_OPS_CAP & |
429 | le64_to_cpu(tcon->fsUnixInfo.Capability))) { | |
276a74a4 | 430 | /* can not refresh inode info since size could be stale */ |
2422f676 | 431 | rc = cifs_posix_open(full_path, &inode, inode->i_sb, |
fa588e0c | 432 | cifs_sb->mnt_file_mode /* ignored */, |
fb1214e4 | 433 | file->f_flags, &oplock, &fid.netfid, xid); |
276a74a4 | 434 | if (rc == 0) { |
b6b38f70 | 435 | cFYI(1, "posix open succeeded"); |
7e12eddb | 436 | posix_open_ok = true; |
64cc2c63 SF |
437 | } else if ((rc == -EINVAL) || (rc == -EOPNOTSUPP)) { |
438 | if (tcon->ses->serverNOS) | |
b6b38f70 | 439 | cERROR(1, "server %s of type %s returned" |
64cc2c63 SF |
440 | " unexpected error on SMB posix open" |
441 | ", disabling posix open support." | |
442 | " Check if server update available.", | |
443 | tcon->ses->serverName, | |
b6b38f70 | 444 | tcon->ses->serverNOS); |
64cc2c63 | 445 | tcon->broken_posix_open = true; |
276a74a4 SF |
446 | } else if ((rc != -EIO) && (rc != -EREMOTE) && |
447 | (rc != -EOPNOTSUPP)) /* path not found or net err */ | |
448 | goto out; | |
fb1214e4 PS |
449 | /* |
450 | * Else fallthrough to retry open the old way on network i/o | |
451 | * or DFS errors. | |
452 | */ | |
276a74a4 SF |
453 | } |
454 | ||
233839b1 PS |
455 | if (server->ops->get_lease_key) |
456 | server->ops->get_lease_key(inode, &fid); | |
457 | ||
458 | cifs_add_pending_open(&fid, tlink, &open); | |
459 | ||
7e12eddb | 460 | if (!posix_open_ok) { |
b8c32dbb PS |
461 | if (server->ops->get_lease_key) |
462 | server->ops->get_lease_key(inode, &fid); | |
463 | ||
7e12eddb | 464 | rc = cifs_nt_open(full_path, inode, cifs_sb, tcon, |
fb1214e4 | 465 | file->f_flags, &oplock, &fid, xid); |
233839b1 PS |
466 | if (rc) { |
467 | cifs_del_pending_open(&open); | |
7e12eddb | 468 | goto out; |
233839b1 | 469 | } |
7e12eddb | 470 | } |
47c78b7f | 471 | |
fb1214e4 PS |
472 | cfile = cifs_new_fileinfo(&fid, file, tlink, oplock); |
473 | if (cfile == NULL) { | |
b8c32dbb PS |
474 | if (server->ops->close) |
475 | server->ops->close(xid, tcon, &fid); | |
233839b1 | 476 | cifs_del_pending_open(&open); |
1da177e4 LT |
477 | rc = -ENOMEM; |
478 | goto out; | |
479 | } | |
1da177e4 | 480 | |
9451a9a5 SJ |
481 | cifs_fscache_set_inode_cookie(inode, file); |
482 | ||
7e12eddb | 483 | if ((oplock & CIFS_CREATE_ACTION) && !posix_open_ok && tcon->unix_ext) { |
fb1214e4 PS |
484 | /* |
485 | * Time to set mode which we can not set earlier due to | |
486 | * problems creating new read-only files. | |
487 | */ | |
7e12eddb PS |
488 | struct cifs_unix_set_info_args args = { |
489 | .mode = inode->i_mode, | |
490 | .uid = NO_CHANGE_64, | |
491 | .gid = NO_CHANGE_64, | |
492 | .ctime = NO_CHANGE_64, | |
493 | .atime = NO_CHANGE_64, | |
494 | .mtime = NO_CHANGE_64, | |
495 | .device = 0, | |
496 | }; | |
fb1214e4 PS |
497 | CIFSSMBUnixSetFileInfo(xid, tcon, &args, fid.netfid, |
498 | cfile->pid); | |
1da177e4 LT |
499 | } |
500 | ||
501 | out: | |
1da177e4 | 502 | kfree(full_path); |
6d5786a3 | 503 | free_xid(xid); |
7ffec372 | 504 | cifs_put_tlink(tlink); |
1da177e4 LT |
505 | return rc; |
506 | } | |
507 | ||
2ae78ba8 PS |
508 | /* |
509 | * Try to reacquire byte range locks that were released when session | |
510 | * to server was lost | |
511 | */ | |
1da177e4 LT |
512 | static int cifs_relock_file(struct cifsFileInfo *cifsFile) |
513 | { | |
514 | int rc = 0; | |
515 | ||
2ae78ba8 | 516 | /* BB list all locks open on this file and relock */ |
1da177e4 LT |
517 | |
518 | return rc; | |
519 | } | |
520 | ||
2ae78ba8 PS |
521 | static int |
522 | cifs_reopen_file(struct cifsFileInfo *cfile, bool can_flush) | |
1da177e4 LT |
523 | { |
524 | int rc = -EACCES; | |
6d5786a3 | 525 | unsigned int xid; |
590a3fe0 | 526 | __u32 oplock; |
1da177e4 | 527 | struct cifs_sb_info *cifs_sb; |
96daf2b0 | 528 | struct cifs_tcon *tcon; |
2ae78ba8 PS |
529 | struct TCP_Server_Info *server; |
530 | struct cifsInodeInfo *cinode; | |
fb8c4b14 | 531 | struct inode *inode; |
1da177e4 | 532 | char *full_path = NULL; |
2ae78ba8 | 533 | int desired_access; |
1da177e4 | 534 | int disposition = FILE_OPEN; |
3d3ea8e6 | 535 | int create_options = CREATE_NOT_DIR; |
2ae78ba8 | 536 | struct cifs_fid fid; |
1da177e4 | 537 | |
6d5786a3 | 538 | xid = get_xid(); |
2ae78ba8 PS |
539 | mutex_lock(&cfile->fh_mutex); |
540 | if (!cfile->invalidHandle) { | |
541 | mutex_unlock(&cfile->fh_mutex); | |
0f3bc09e | 542 | rc = 0; |
6d5786a3 | 543 | free_xid(xid); |
0f3bc09e | 544 | return rc; |
1da177e4 LT |
545 | } |
546 | ||
2ae78ba8 | 547 | inode = cfile->dentry->d_inode; |
1da177e4 | 548 | cifs_sb = CIFS_SB(inode->i_sb); |
2ae78ba8 PS |
549 | tcon = tlink_tcon(cfile->tlink); |
550 | server = tcon->ses->server; | |
551 | ||
552 | /* | |
553 | * Can not grab rename sem here because various ops, including those | |
554 | * that already have the rename sem can end up causing writepage to get | |
555 | * called and if the server was down that means we end up here, and we | |
556 | * can never tell if the caller already has the rename_sem. | |
557 | */ | |
558 | full_path = build_path_from_dentry(cfile->dentry); | |
1da177e4 | 559 | if (full_path == NULL) { |
3a9f462f | 560 | rc = -ENOMEM; |
2ae78ba8 | 561 | mutex_unlock(&cfile->fh_mutex); |
6d5786a3 | 562 | free_xid(xid); |
3a9f462f | 563 | return rc; |
1da177e4 LT |
564 | } |
565 | ||
2ae78ba8 PS |
566 | cFYI(1, "inode = 0x%p file flags 0x%x for %s", inode, cfile->f_flags, |
567 | full_path); | |
1da177e4 | 568 | |
10b9b98e | 569 | if (tcon->ses->server->oplocks) |
1da177e4 LT |
570 | oplock = REQ_OPLOCK; |
571 | else | |
4b18f2a9 | 572 | oplock = 0; |
1da177e4 | 573 | |
29e20f9c | 574 | if (tcon->unix_ext && cap_unix(tcon->ses) && |
7fc8f4e9 | 575 | (CIFS_UNIX_POSIX_PATH_OPS_CAP & |
29e20f9c | 576 | le64_to_cpu(tcon->fsUnixInfo.Capability))) { |
608712fe JL |
577 | /* |
578 | * O_CREAT, O_EXCL and O_TRUNC already had their effect on the | |
579 | * original open. Must mask them off for a reopen. | |
580 | */ | |
2ae78ba8 | 581 | unsigned int oflags = cfile->f_flags & |
15886177 | 582 | ~(O_CREAT | O_EXCL | O_TRUNC); |
608712fe | 583 | |
2422f676 | 584 | rc = cifs_posix_open(full_path, NULL, inode->i_sb, |
2ae78ba8 PS |
585 | cifs_sb->mnt_file_mode /* ignored */, |
586 | oflags, &oplock, &fid.netfid, xid); | |
7fc8f4e9 | 587 | if (rc == 0) { |
b6b38f70 | 588 | cFYI(1, "posix reopen succeeded"); |
7fc8f4e9 SF |
589 | goto reopen_success; |
590 | } | |
2ae78ba8 PS |
591 | /* |
592 | * fallthrough to retry open the old way on errors, especially | |
593 | * in the reconnect path it is important to retry hard | |
594 | */ | |
7fc8f4e9 SF |
595 | } |
596 | ||
2ae78ba8 | 597 | desired_access = cifs_convert_flags(cfile->f_flags); |
7fc8f4e9 | 598 | |
3d3ea8e6 SP |
599 | if (backup_cred(cifs_sb)) |
600 | create_options |= CREATE_OPEN_BACKUP_INTENT; | |
601 | ||
b8c32dbb PS |
602 | if (server->ops->get_lease_key) |
603 | server->ops->get_lease_key(inode, &fid); | |
604 | ||
2ae78ba8 PS |
605 | /* |
606 | * Can not refresh inode by passing in file_info buf to be returned by | |
607 | * CIFSSMBOpen and then calling get_inode_info with returned buf since | |
608 | * file might have write behind data that needs to be flushed and server | |
609 | * version of file size can be stale. If we knew for sure that inode was | |
610 | * not dirty locally we could do this. | |
611 | */ | |
612 | rc = server->ops->open(xid, tcon, full_path, disposition, | |
613 | desired_access, create_options, &fid, &oplock, | |
614 | NULL, cifs_sb); | |
1da177e4 | 615 | if (rc) { |
2ae78ba8 PS |
616 | mutex_unlock(&cfile->fh_mutex); |
617 | cFYI(1, "cifs_reopen returned 0x%x", rc); | |
b6b38f70 | 618 | cFYI(1, "oplock: %d", oplock); |
15886177 JL |
619 | goto reopen_error_exit; |
620 | } | |
621 | ||
7fc8f4e9 | 622 | reopen_success: |
2ae78ba8 PS |
623 | cfile->invalidHandle = false; |
624 | mutex_unlock(&cfile->fh_mutex); | |
625 | cinode = CIFS_I(inode); | |
15886177 JL |
626 | |
627 | if (can_flush) { | |
628 | rc = filemap_write_and_wait(inode->i_mapping); | |
eb4b756b | 629 | mapping_set_error(inode->i_mapping, rc); |
15886177 | 630 | |
15886177 | 631 | if (tcon->unix_ext) |
2ae78ba8 PS |
632 | rc = cifs_get_inode_info_unix(&inode, full_path, |
633 | inode->i_sb, xid); | |
15886177 | 634 | else |
2ae78ba8 PS |
635 | rc = cifs_get_inode_info(&inode, full_path, NULL, |
636 | inode->i_sb, xid, NULL); | |
637 | } | |
638 | /* | |
639 | * Else we are writing out data to server already and could deadlock if | |
640 | * we tried to flush data, and since we do not know if we have data that | |
641 | * would invalidate the current end of file on the server we can not go | |
642 | * to the server to get the new inode info. | |
643 | */ | |
644 | ||
645 | server->ops->set_fid(cfile, &fid, oplock); | |
646 | cifs_relock_file(cfile); | |
15886177 JL |
647 | |
648 | reopen_error_exit: | |
1da177e4 | 649 | kfree(full_path); |
6d5786a3 | 650 | free_xid(xid); |
1da177e4 LT |
651 | return rc; |
652 | } | |
653 | ||
654 | int cifs_close(struct inode *inode, struct file *file) | |
655 | { | |
77970693 JL |
656 | if (file->private_data != NULL) { |
657 | cifsFileInfo_put(file->private_data); | |
658 | file->private_data = NULL; | |
659 | } | |
7ee1af76 | 660 | |
cdff08e7 SF |
661 | /* return code from the ->release op is always ignored */ |
662 | return 0; | |
1da177e4 LT |
663 | } |
664 | ||
665 | int cifs_closedir(struct inode *inode, struct file *file) | |
666 | { | |
667 | int rc = 0; | |
6d5786a3 | 668 | unsigned int xid; |
4b4de76e | 669 | struct cifsFileInfo *cfile = file->private_data; |
92fc65a7 PS |
670 | struct cifs_tcon *tcon; |
671 | struct TCP_Server_Info *server; | |
672 | char *buf; | |
1da177e4 | 673 | |
b6b38f70 | 674 | cFYI(1, "Closedir inode = 0x%p", inode); |
1da177e4 | 675 | |
92fc65a7 PS |
676 | if (cfile == NULL) |
677 | return rc; | |
678 | ||
6d5786a3 | 679 | xid = get_xid(); |
92fc65a7 PS |
680 | tcon = tlink_tcon(cfile->tlink); |
681 | server = tcon->ses->server; | |
1da177e4 | 682 | |
92fc65a7 PS |
683 | cFYI(1, "Freeing private data in close dir"); |
684 | spin_lock(&cifs_file_list_lock); | |
685 | if (!cfile->srch_inf.endOfSearch && !cfile->invalidHandle) { | |
686 | cfile->invalidHandle = true; | |
687 | spin_unlock(&cifs_file_list_lock); | |
688 | if (server->ops->close_dir) | |
689 | rc = server->ops->close_dir(xid, tcon, &cfile->fid); | |
690 | else | |
691 | rc = -ENOSYS; | |
692 | cFYI(1, "Closing uncompleted readdir with rc %d", rc); | |
693 | /* not much we can do if it fails anyway, ignore rc */ | |
694 | rc = 0; | |
695 | } else | |
696 | spin_unlock(&cifs_file_list_lock); | |
697 | ||
698 | buf = cfile->srch_inf.ntwrk_buf_start; | |
699 | if (buf) { | |
700 | cFYI(1, "closedir free smb buf in srch struct"); | |
701 | cfile->srch_inf.ntwrk_buf_start = NULL; | |
702 | if (cfile->srch_inf.smallBuf) | |
703 | cifs_small_buf_release(buf); | |
704 | else | |
705 | cifs_buf_release(buf); | |
1da177e4 | 706 | } |
92fc65a7 PS |
707 | |
708 | cifs_put_tlink(cfile->tlink); | |
709 | kfree(file->private_data); | |
710 | file->private_data = NULL; | |
1da177e4 | 711 | /* BB can we lock the filestruct while this is going on? */ |
6d5786a3 | 712 | free_xid(xid); |
1da177e4 LT |
713 | return rc; |
714 | } | |
715 | ||
85160e03 | 716 | static struct cifsLockInfo * |
fbd35aca | 717 | cifs_lock_init(__u64 offset, __u64 length, __u8 type) |
7ee1af76 | 718 | { |
a88b4707 | 719 | struct cifsLockInfo *lock = |
fb8c4b14 | 720 | kmalloc(sizeof(struct cifsLockInfo), GFP_KERNEL); |
a88b4707 PS |
721 | if (!lock) |
722 | return lock; | |
723 | lock->offset = offset; | |
724 | lock->length = length; | |
725 | lock->type = type; | |
a88b4707 PS |
726 | lock->pid = current->tgid; |
727 | INIT_LIST_HEAD(&lock->blist); | |
728 | init_waitqueue_head(&lock->block_q); | |
729 | return lock; | |
85160e03 PS |
730 | } |
731 | ||
f7ba7fe6 | 732 | void |
85160e03 PS |
733 | cifs_del_lock_waiters(struct cifsLockInfo *lock) |
734 | { | |
735 | struct cifsLockInfo *li, *tmp; | |
736 | list_for_each_entry_safe(li, tmp, &lock->blist, blist) { | |
737 | list_del_init(&li->blist); | |
738 | wake_up(&li->block_q); | |
739 | } | |
740 | } | |
741 | ||
742 | static bool | |
f45d3416 PS |
743 | cifs_find_fid_lock_conflict(struct cifs_fid_locks *fdlocks, __u64 offset, |
744 | __u64 length, __u8 type, struct cifsFileInfo *cfile, | |
579f9053 | 745 | struct cifsLockInfo **conf_lock, bool rw_check) |
85160e03 | 746 | { |
fbd35aca | 747 | struct cifsLockInfo *li; |
f45d3416 | 748 | struct cifsFileInfo *cur_cfile = fdlocks->cfile; |
106dc538 | 749 | struct TCP_Server_Info *server = tlink_tcon(cfile->tlink)->ses->server; |
85160e03 | 750 | |
f45d3416 | 751 | list_for_each_entry(li, &fdlocks->locks, llist) { |
85160e03 PS |
752 | if (offset + length <= li->offset || |
753 | offset >= li->offset + li->length) | |
754 | continue; | |
579f9053 PS |
755 | if (rw_check && server->ops->compare_fids(cfile, cur_cfile) && |
756 | current->tgid == li->pid) | |
757 | continue; | |
f45d3416 PS |
758 | if ((type & server->vals->shared_lock_type) && |
759 | ((server->ops->compare_fids(cfile, cur_cfile) && | |
760 | current->tgid == li->pid) || type == li->type)) | |
85160e03 | 761 | continue; |
579f9053 PS |
762 | if (conf_lock) |
763 | *conf_lock = li; | |
f45d3416 | 764 | return true; |
85160e03 PS |
765 | } |
766 | return false; | |
767 | } | |
768 | ||
579f9053 | 769 | bool |
55157dfb | 770 | cifs_find_lock_conflict(struct cifsFileInfo *cfile, __u64 offset, __u64 length, |
579f9053 PS |
771 | __u8 type, struct cifsLockInfo **conf_lock, |
772 | bool rw_check) | |
161ebf9f | 773 | { |
fbd35aca | 774 | bool rc = false; |
f45d3416 | 775 | struct cifs_fid_locks *cur; |
55157dfb | 776 | struct cifsInodeInfo *cinode = CIFS_I(cfile->dentry->d_inode); |
fbd35aca | 777 | |
f45d3416 PS |
778 | list_for_each_entry(cur, &cinode->llist, llist) { |
779 | rc = cifs_find_fid_lock_conflict(cur, offset, length, type, | |
579f9053 | 780 | cfile, conf_lock, rw_check); |
fbd35aca PS |
781 | if (rc) |
782 | break; | |
783 | } | |
fbd35aca PS |
784 | |
785 | return rc; | |
161ebf9f PS |
786 | } |
787 | ||
9a5101c8 PS |
788 | /* |
789 | * Check if there is another lock that prevents us to set the lock (mandatory | |
790 | * style). If such a lock exists, update the flock structure with its | |
791 | * properties. Otherwise, set the flock type to F_UNLCK if we can cache brlocks | |
792 | * or leave it the same if we can't. Returns 0 if we don't need to request to | |
793 | * the server or 1 otherwise. | |
794 | */ | |
85160e03 | 795 | static int |
fbd35aca PS |
796 | cifs_lock_test(struct cifsFileInfo *cfile, __u64 offset, __u64 length, |
797 | __u8 type, struct file_lock *flock) | |
85160e03 PS |
798 | { |
799 | int rc = 0; | |
800 | struct cifsLockInfo *conf_lock; | |
fbd35aca | 801 | struct cifsInodeInfo *cinode = CIFS_I(cfile->dentry->d_inode); |
106dc538 | 802 | struct TCP_Server_Info *server = tlink_tcon(cfile->tlink)->ses->server; |
85160e03 PS |
803 | bool exist; |
804 | ||
1b4b55a1 | 805 | down_read(&cinode->lock_sem); |
85160e03 | 806 | |
55157dfb | 807 | exist = cifs_find_lock_conflict(cfile, offset, length, type, |
579f9053 | 808 | &conf_lock, false); |
85160e03 PS |
809 | if (exist) { |
810 | flock->fl_start = conf_lock->offset; | |
811 | flock->fl_end = conf_lock->offset + conf_lock->length - 1; | |
812 | flock->fl_pid = conf_lock->pid; | |
106dc538 | 813 | if (conf_lock->type & server->vals->shared_lock_type) |
85160e03 PS |
814 | flock->fl_type = F_RDLCK; |
815 | else | |
816 | flock->fl_type = F_WRLCK; | |
817 | } else if (!cinode->can_cache_brlcks) | |
818 | rc = 1; | |
819 | else | |
820 | flock->fl_type = F_UNLCK; | |
821 | ||
1b4b55a1 | 822 | up_read(&cinode->lock_sem); |
85160e03 PS |
823 | return rc; |
824 | } | |
825 | ||
161ebf9f | 826 | static void |
fbd35aca | 827 | cifs_lock_add(struct cifsFileInfo *cfile, struct cifsLockInfo *lock) |
85160e03 | 828 | { |
fbd35aca | 829 | struct cifsInodeInfo *cinode = CIFS_I(cfile->dentry->d_inode); |
1b4b55a1 | 830 | down_write(&cinode->lock_sem); |
f45d3416 | 831 | list_add_tail(&lock->llist, &cfile->llist->locks); |
1b4b55a1 | 832 | up_write(&cinode->lock_sem); |
7ee1af76 JA |
833 | } |
834 | ||
9a5101c8 PS |
835 | /* |
836 | * Set the byte-range lock (mandatory style). Returns: | |
837 | * 1) 0, if we set the lock and don't need to request to the server; | |
838 | * 2) 1, if no locks prevent us but we need to request to the server; | |
839 | * 3) -EACCESS, if there is a lock that prevents us and wait is false. | |
840 | */ | |
85160e03 | 841 | static int |
fbd35aca | 842 | cifs_lock_add_if(struct cifsFileInfo *cfile, struct cifsLockInfo *lock, |
161ebf9f | 843 | bool wait) |
85160e03 | 844 | { |
161ebf9f | 845 | struct cifsLockInfo *conf_lock; |
fbd35aca | 846 | struct cifsInodeInfo *cinode = CIFS_I(cfile->dentry->d_inode); |
85160e03 PS |
847 | bool exist; |
848 | int rc = 0; | |
849 | ||
85160e03 PS |
850 | try_again: |
851 | exist = false; | |
1b4b55a1 | 852 | down_write(&cinode->lock_sem); |
85160e03 | 853 | |
55157dfb | 854 | exist = cifs_find_lock_conflict(cfile, lock->offset, lock->length, |
579f9053 | 855 | lock->type, &conf_lock, false); |
85160e03 | 856 | if (!exist && cinode->can_cache_brlcks) { |
f45d3416 | 857 | list_add_tail(&lock->llist, &cfile->llist->locks); |
1b4b55a1 | 858 | up_write(&cinode->lock_sem); |
85160e03 PS |
859 | return rc; |
860 | } | |
861 | ||
862 | if (!exist) | |
863 | rc = 1; | |
864 | else if (!wait) | |
865 | rc = -EACCES; | |
866 | else { | |
867 | list_add_tail(&lock->blist, &conf_lock->blist); | |
1b4b55a1 | 868 | up_write(&cinode->lock_sem); |
85160e03 PS |
869 | rc = wait_event_interruptible(lock->block_q, |
870 | (lock->blist.prev == &lock->blist) && | |
871 | (lock->blist.next == &lock->blist)); | |
872 | if (!rc) | |
873 | goto try_again; | |
1b4b55a1 | 874 | down_write(&cinode->lock_sem); |
a88b4707 | 875 | list_del_init(&lock->blist); |
85160e03 PS |
876 | } |
877 | ||
1b4b55a1 | 878 | up_write(&cinode->lock_sem); |
85160e03 PS |
879 | return rc; |
880 | } | |
881 | ||
9a5101c8 PS |
882 | /* |
883 | * Check if there is another lock that prevents us to set the lock (posix | |
884 | * style). If such a lock exists, update the flock structure with its | |
885 | * properties. Otherwise, set the flock type to F_UNLCK if we can cache brlocks | |
886 | * or leave it the same if we can't. Returns 0 if we don't need to request to | |
887 | * the server or 1 otherwise. | |
888 | */ | |
85160e03 | 889 | static int |
4f6bcec9 PS |
890 | cifs_posix_lock_test(struct file *file, struct file_lock *flock) |
891 | { | |
892 | int rc = 0; | |
893 | struct cifsInodeInfo *cinode = CIFS_I(file->f_path.dentry->d_inode); | |
894 | unsigned char saved_type = flock->fl_type; | |
895 | ||
50792760 PS |
896 | if ((flock->fl_flags & FL_POSIX) == 0) |
897 | return 1; | |
898 | ||
1b4b55a1 | 899 | down_read(&cinode->lock_sem); |
4f6bcec9 PS |
900 | posix_test_lock(file, flock); |
901 | ||
902 | if (flock->fl_type == F_UNLCK && !cinode->can_cache_brlcks) { | |
903 | flock->fl_type = saved_type; | |
904 | rc = 1; | |
905 | } | |
906 | ||
1b4b55a1 | 907 | up_read(&cinode->lock_sem); |
4f6bcec9 PS |
908 | return rc; |
909 | } | |
910 | ||
9a5101c8 PS |
911 | /* |
912 | * Set the byte-range lock (posix style). Returns: | |
913 | * 1) 0, if we set the lock and don't need to request to the server; | |
914 | * 2) 1, if we need to request to the server; | |
915 | * 3) <0, if the error occurs while setting the lock. | |
916 | */ | |
4f6bcec9 PS |
917 | static int |
918 | cifs_posix_lock_set(struct file *file, struct file_lock *flock) | |
919 | { | |
920 | struct cifsInodeInfo *cinode = CIFS_I(file->f_path.dentry->d_inode); | |
50792760 PS |
921 | int rc = 1; |
922 | ||
923 | if ((flock->fl_flags & FL_POSIX) == 0) | |
924 | return rc; | |
4f6bcec9 | 925 | |
66189be7 | 926 | try_again: |
1b4b55a1 | 927 | down_write(&cinode->lock_sem); |
4f6bcec9 | 928 | if (!cinode->can_cache_brlcks) { |
1b4b55a1 | 929 | up_write(&cinode->lock_sem); |
50792760 | 930 | return rc; |
4f6bcec9 | 931 | } |
66189be7 PS |
932 | |
933 | rc = posix_lock_file(file, flock, NULL); | |
1b4b55a1 | 934 | up_write(&cinode->lock_sem); |
66189be7 PS |
935 | if (rc == FILE_LOCK_DEFERRED) { |
936 | rc = wait_event_interruptible(flock->fl_wait, !flock->fl_next); | |
937 | if (!rc) | |
938 | goto try_again; | |
939 | locks_delete_block(flock); | |
940 | } | |
9ebb389d | 941 | return rc; |
4f6bcec9 PS |
942 | } |
943 | ||
d39a4f71 | 944 | int |
4f6bcec9 | 945 | cifs_push_mandatory_locks(struct cifsFileInfo *cfile) |
85160e03 | 946 | { |
6d5786a3 PS |
947 | unsigned int xid; |
948 | int rc = 0, stored_rc; | |
85160e03 PS |
949 | struct cifsLockInfo *li, *tmp; |
950 | struct cifs_tcon *tcon; | |
0013fb4c | 951 | unsigned int num, max_num, max_buf; |
32b9aaf1 PS |
952 | LOCKING_ANDX_RANGE *buf, *cur; |
953 | int types[] = {LOCKING_ANDX_LARGE_FILES, | |
954 | LOCKING_ANDX_SHARED_LOCK | LOCKING_ANDX_LARGE_FILES}; | |
955 | int i; | |
85160e03 | 956 | |
6d5786a3 | 957 | xid = get_xid(); |
85160e03 PS |
958 | tcon = tlink_tcon(cfile->tlink); |
959 | ||
0013fb4c PS |
960 | /* |
961 | * Accessing maxBuf is racy with cifs_reconnect - need to store value | |
962 | * and check it for zero before using. | |
963 | */ | |
964 | max_buf = tcon->ses->server->maxBuf; | |
965 | if (!max_buf) { | |
6d5786a3 | 966 | free_xid(xid); |
0013fb4c PS |
967 | return -EINVAL; |
968 | } | |
969 | ||
970 | max_num = (max_buf - sizeof(struct smb_hdr)) / | |
971 | sizeof(LOCKING_ANDX_RANGE); | |
32b9aaf1 PS |
972 | buf = kzalloc(max_num * sizeof(LOCKING_ANDX_RANGE), GFP_KERNEL); |
973 | if (!buf) { | |
6d5786a3 | 974 | free_xid(xid); |
e2f2886a | 975 | return -ENOMEM; |
32b9aaf1 PS |
976 | } |
977 | ||
978 | for (i = 0; i < 2; i++) { | |
979 | cur = buf; | |
980 | num = 0; | |
f45d3416 | 981 | list_for_each_entry_safe(li, tmp, &cfile->llist->locks, llist) { |
32b9aaf1 PS |
982 | if (li->type != types[i]) |
983 | continue; | |
984 | cur->Pid = cpu_to_le16(li->pid); | |
985 | cur->LengthLow = cpu_to_le32((u32)li->length); | |
986 | cur->LengthHigh = cpu_to_le32((u32)(li->length>>32)); | |
987 | cur->OffsetLow = cpu_to_le32((u32)li->offset); | |
988 | cur->OffsetHigh = cpu_to_le32((u32)(li->offset>>32)); | |
989 | if (++num == max_num) { | |
4b4de76e PS |
990 | stored_rc = cifs_lockv(xid, tcon, |
991 | cfile->fid.netfid, | |
04a6aa8a PS |
992 | (__u8)li->type, 0, num, |
993 | buf); | |
32b9aaf1 PS |
994 | if (stored_rc) |
995 | rc = stored_rc; | |
996 | cur = buf; | |
997 | num = 0; | |
998 | } else | |
999 | cur++; | |
1000 | } | |
1001 | ||
1002 | if (num) { | |
4b4de76e | 1003 | stored_rc = cifs_lockv(xid, tcon, cfile->fid.netfid, |
04a6aa8a | 1004 | (__u8)types[i], 0, num, buf); |
32b9aaf1 PS |
1005 | if (stored_rc) |
1006 | rc = stored_rc; | |
1007 | } | |
85160e03 PS |
1008 | } |
1009 | ||
32b9aaf1 | 1010 | kfree(buf); |
6d5786a3 | 1011 | free_xid(xid); |
85160e03 PS |
1012 | return rc; |
1013 | } | |
1014 | ||
4f6bcec9 PS |
1015 | /* copied from fs/locks.c with a name change */ |
1016 | #define cifs_for_each_lock(inode, lockp) \ | |
1017 | for (lockp = &inode->i_flock; *lockp != NULL; \ | |
1018 | lockp = &(*lockp)->fl_next) | |
1019 | ||
d5751469 PS |
1020 | struct lock_to_push { |
1021 | struct list_head llist; | |
1022 | __u64 offset; | |
1023 | __u64 length; | |
1024 | __u32 pid; | |
1025 | __u16 netfid; | |
1026 | __u8 type; | |
1027 | }; | |
1028 | ||
4f6bcec9 | 1029 | static int |
b8db928b | 1030 | cifs_push_posix_locks(struct cifsFileInfo *cfile) |
4f6bcec9 | 1031 | { |
4f6bcec9 PS |
1032 | struct cifs_tcon *tcon = tlink_tcon(cfile->tlink); |
1033 | struct file_lock *flock, **before; | |
d5751469 | 1034 | unsigned int count = 0, i = 0; |
4f6bcec9 | 1035 | int rc = 0, xid, type; |
d5751469 PS |
1036 | struct list_head locks_to_send, *el; |
1037 | struct lock_to_push *lck, *tmp; | |
4f6bcec9 | 1038 | __u64 length; |
4f6bcec9 | 1039 | |
6d5786a3 | 1040 | xid = get_xid(); |
4f6bcec9 | 1041 | |
d5751469 PS |
1042 | lock_flocks(); |
1043 | cifs_for_each_lock(cfile->dentry->d_inode, before) { | |
1044 | if ((*before)->fl_flags & FL_POSIX) | |
1045 | count++; | |
1046 | } | |
1047 | unlock_flocks(); | |
1048 | ||
4f6bcec9 PS |
1049 | INIT_LIST_HEAD(&locks_to_send); |
1050 | ||
d5751469 | 1051 | /* |
ce85852b | 1052 | * Allocating count locks is enough because no FL_POSIX locks can be |
1b4b55a1 | 1053 | * added to the list while we are holding cinode->lock_sem that |
ce85852b | 1054 | * protects locking operations of this inode. |
d5751469 PS |
1055 | */ |
1056 | for (; i < count; i++) { | |
1057 | lck = kmalloc(sizeof(struct lock_to_push), GFP_KERNEL); | |
1058 | if (!lck) { | |
1059 | rc = -ENOMEM; | |
1060 | goto err_out; | |
1061 | } | |
1062 | list_add_tail(&lck->llist, &locks_to_send); | |
1063 | } | |
1064 | ||
d5751469 | 1065 | el = locks_to_send.next; |
4f6bcec9 PS |
1066 | lock_flocks(); |
1067 | cifs_for_each_lock(cfile->dentry->d_inode, before) { | |
ce85852b PS |
1068 | flock = *before; |
1069 | if ((flock->fl_flags & FL_POSIX) == 0) | |
1070 | continue; | |
d5751469 | 1071 | if (el == &locks_to_send) { |
ce85852b PS |
1072 | /* |
1073 | * The list ended. We don't have enough allocated | |
1074 | * structures - something is really wrong. | |
1075 | */ | |
d5751469 PS |
1076 | cERROR(1, "Can't push all brlocks!"); |
1077 | break; | |
1078 | } | |
4f6bcec9 PS |
1079 | length = 1 + flock->fl_end - flock->fl_start; |
1080 | if (flock->fl_type == F_RDLCK || flock->fl_type == F_SHLCK) | |
1081 | type = CIFS_RDLCK; | |
1082 | else | |
1083 | type = CIFS_WRLCK; | |
d5751469 | 1084 | lck = list_entry(el, struct lock_to_push, llist); |
4f6bcec9 | 1085 | lck->pid = flock->fl_pid; |
4b4de76e | 1086 | lck->netfid = cfile->fid.netfid; |
d5751469 PS |
1087 | lck->length = length; |
1088 | lck->type = type; | |
1089 | lck->offset = flock->fl_start; | |
d5751469 | 1090 | el = el->next; |
4f6bcec9 | 1091 | } |
4f6bcec9 PS |
1092 | unlock_flocks(); |
1093 | ||
1094 | list_for_each_entry_safe(lck, tmp, &locks_to_send, llist) { | |
4f6bcec9 PS |
1095 | int stored_rc; |
1096 | ||
4f6bcec9 | 1097 | stored_rc = CIFSSMBPosixLock(xid, tcon, lck->netfid, lck->pid, |
c5fd363d | 1098 | lck->offset, lck->length, NULL, |
4f6bcec9 PS |
1099 | lck->type, 0); |
1100 | if (stored_rc) | |
1101 | rc = stored_rc; | |
1102 | list_del(&lck->llist); | |
1103 | kfree(lck); | |
1104 | } | |
1105 | ||
d5751469 | 1106 | out: |
6d5786a3 | 1107 | free_xid(xid); |
4f6bcec9 | 1108 | return rc; |
d5751469 PS |
1109 | err_out: |
1110 | list_for_each_entry_safe(lck, tmp, &locks_to_send, llist) { | |
1111 | list_del(&lck->llist); | |
1112 | kfree(lck); | |
1113 | } | |
1114 | goto out; | |
4f6bcec9 PS |
1115 | } |
1116 | ||
9ec3c882 | 1117 | static int |
b8db928b | 1118 | cifs_push_locks(struct cifsFileInfo *cfile) |
9ec3c882 | 1119 | { |
b8db928b | 1120 | struct cifs_sb_info *cifs_sb = CIFS_SB(cfile->dentry->d_sb); |
9ec3c882 | 1121 | struct cifsInodeInfo *cinode = CIFS_I(cfile->dentry->d_inode); |
b8db928b | 1122 | struct cifs_tcon *tcon = tlink_tcon(cfile->tlink); |
9ec3c882 PS |
1123 | int rc = 0; |
1124 | ||
1125 | /* we are going to update can_cache_brlcks here - need a write access */ | |
1126 | down_write(&cinode->lock_sem); | |
1127 | if (!cinode->can_cache_brlcks) { | |
1128 | up_write(&cinode->lock_sem); | |
1129 | return rc; | |
1130 | } | |
4f6bcec9 | 1131 | |
29e20f9c | 1132 | if (cap_unix(tcon->ses) && |
4f6bcec9 PS |
1133 | (CIFS_UNIX_FCNTL_CAP & le64_to_cpu(tcon->fsUnixInfo.Capability)) && |
1134 | ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NOPOSIXBRL) == 0)) | |
b8db928b PS |
1135 | rc = cifs_push_posix_locks(cfile); |
1136 | else | |
1137 | rc = tcon->ses->server->ops->push_mand_locks(cfile); | |
4f6bcec9 | 1138 | |
b8db928b PS |
1139 | cinode->can_cache_brlcks = false; |
1140 | up_write(&cinode->lock_sem); | |
1141 | return rc; | |
4f6bcec9 PS |
1142 | } |
1143 | ||
03776f45 | 1144 | static void |
04a6aa8a | 1145 | cifs_read_flock(struct file_lock *flock, __u32 *type, int *lock, int *unlock, |
106dc538 | 1146 | bool *wait_flag, struct TCP_Server_Info *server) |
1da177e4 | 1147 | { |
03776f45 | 1148 | if (flock->fl_flags & FL_POSIX) |
b6b38f70 | 1149 | cFYI(1, "Posix"); |
03776f45 | 1150 | if (flock->fl_flags & FL_FLOCK) |
b6b38f70 | 1151 | cFYI(1, "Flock"); |
03776f45 | 1152 | if (flock->fl_flags & FL_SLEEP) { |
b6b38f70 | 1153 | cFYI(1, "Blocking lock"); |
03776f45 | 1154 | *wait_flag = true; |
1da177e4 | 1155 | } |
03776f45 | 1156 | if (flock->fl_flags & FL_ACCESS) |
b6b38f70 | 1157 | cFYI(1, "Process suspended by mandatory locking - " |
03776f45 PS |
1158 | "not implemented yet"); |
1159 | if (flock->fl_flags & FL_LEASE) | |
b6b38f70 | 1160 | cFYI(1, "Lease on file - not implemented yet"); |
03776f45 | 1161 | if (flock->fl_flags & |
3d6d854a JL |
1162 | (~(FL_POSIX | FL_FLOCK | FL_SLEEP | |
1163 | FL_ACCESS | FL_LEASE | FL_CLOSE))) | |
03776f45 | 1164 | cFYI(1, "Unknown lock flags 0x%x", flock->fl_flags); |
1da177e4 | 1165 | |
106dc538 | 1166 | *type = server->vals->large_lock_type; |
03776f45 | 1167 | if (flock->fl_type == F_WRLCK) { |
b6b38f70 | 1168 | cFYI(1, "F_WRLCK "); |
106dc538 | 1169 | *type |= server->vals->exclusive_lock_type; |
03776f45 PS |
1170 | *lock = 1; |
1171 | } else if (flock->fl_type == F_UNLCK) { | |
b6b38f70 | 1172 | cFYI(1, "F_UNLCK"); |
106dc538 | 1173 | *type |= server->vals->unlock_lock_type; |
03776f45 PS |
1174 | *unlock = 1; |
1175 | /* Check if unlock includes more than one lock range */ | |
1176 | } else if (flock->fl_type == F_RDLCK) { | |
b6b38f70 | 1177 | cFYI(1, "F_RDLCK"); |
106dc538 | 1178 | *type |= server->vals->shared_lock_type; |
03776f45 PS |
1179 | *lock = 1; |
1180 | } else if (flock->fl_type == F_EXLCK) { | |
b6b38f70 | 1181 | cFYI(1, "F_EXLCK"); |
106dc538 | 1182 | *type |= server->vals->exclusive_lock_type; |
03776f45 PS |
1183 | *lock = 1; |
1184 | } else if (flock->fl_type == F_SHLCK) { | |
b6b38f70 | 1185 | cFYI(1, "F_SHLCK"); |
106dc538 | 1186 | *type |= server->vals->shared_lock_type; |
03776f45 | 1187 | *lock = 1; |
1da177e4 | 1188 | } else |
b6b38f70 | 1189 | cFYI(1, "Unknown type of lock"); |
03776f45 | 1190 | } |
1da177e4 | 1191 | |
03776f45 | 1192 | static int |
04a6aa8a | 1193 | cifs_getlk(struct file *file, struct file_lock *flock, __u32 type, |
6d5786a3 | 1194 | bool wait_flag, bool posix_lck, unsigned int xid) |
03776f45 PS |
1195 | { |
1196 | int rc = 0; | |
1197 | __u64 length = 1 + flock->fl_end - flock->fl_start; | |
4f6bcec9 PS |
1198 | struct cifsFileInfo *cfile = (struct cifsFileInfo *)file->private_data; |
1199 | struct cifs_tcon *tcon = tlink_tcon(cfile->tlink); | |
106dc538 | 1200 | struct TCP_Server_Info *server = tcon->ses->server; |
4b4de76e | 1201 | __u16 netfid = cfile->fid.netfid; |
f05337c6 | 1202 | |
03776f45 PS |
1203 | if (posix_lck) { |
1204 | int posix_lock_type; | |
4f6bcec9 PS |
1205 | |
1206 | rc = cifs_posix_lock_test(file, flock); | |
1207 | if (!rc) | |
1208 | return rc; | |
1209 | ||
106dc538 | 1210 | if (type & server->vals->shared_lock_type) |
03776f45 PS |
1211 | posix_lock_type = CIFS_RDLCK; |
1212 | else | |
1213 | posix_lock_type = CIFS_WRLCK; | |
4f6bcec9 | 1214 | rc = CIFSSMBPosixLock(xid, tcon, netfid, current->tgid, |
c5fd363d | 1215 | flock->fl_start, length, flock, |
4f6bcec9 | 1216 | posix_lock_type, wait_flag); |
03776f45 PS |
1217 | return rc; |
1218 | } | |
1da177e4 | 1219 | |
fbd35aca | 1220 | rc = cifs_lock_test(cfile, flock->fl_start, length, type, flock); |
85160e03 PS |
1221 | if (!rc) |
1222 | return rc; | |
1223 | ||
03776f45 | 1224 | /* BB we could chain these into one lock request BB */ |
d39a4f71 PS |
1225 | rc = server->ops->mand_lock(xid, cfile, flock->fl_start, length, type, |
1226 | 1, 0, false); | |
03776f45 | 1227 | if (rc == 0) { |
d39a4f71 PS |
1228 | rc = server->ops->mand_lock(xid, cfile, flock->fl_start, length, |
1229 | type, 0, 1, false); | |
03776f45 PS |
1230 | flock->fl_type = F_UNLCK; |
1231 | if (rc != 0) | |
1232 | cERROR(1, "Error unlocking previously locked " | |
106dc538 | 1233 | "range %d during test of lock", rc); |
a88b4707 | 1234 | return 0; |
1da177e4 | 1235 | } |
7ee1af76 | 1236 | |
106dc538 | 1237 | if (type & server->vals->shared_lock_type) { |
03776f45 | 1238 | flock->fl_type = F_WRLCK; |
a88b4707 | 1239 | return 0; |
7ee1af76 JA |
1240 | } |
1241 | ||
d39a4f71 PS |
1242 | type &= ~server->vals->exclusive_lock_type; |
1243 | ||
1244 | rc = server->ops->mand_lock(xid, cfile, flock->fl_start, length, | |
1245 | type | server->vals->shared_lock_type, | |
1246 | 1, 0, false); | |
03776f45 | 1247 | if (rc == 0) { |
d39a4f71 PS |
1248 | rc = server->ops->mand_lock(xid, cfile, flock->fl_start, length, |
1249 | type | server->vals->shared_lock_type, 0, 1, false); | |
03776f45 PS |
1250 | flock->fl_type = F_RDLCK; |
1251 | if (rc != 0) | |
1252 | cERROR(1, "Error unlocking previously locked " | |
1253 | "range %d during test of lock", rc); | |
1254 | } else | |
1255 | flock->fl_type = F_WRLCK; | |
1256 | ||
a88b4707 | 1257 | return 0; |
03776f45 PS |
1258 | } |
1259 | ||
f7ba7fe6 | 1260 | void |
9ee305b7 PS |
1261 | cifs_move_llist(struct list_head *source, struct list_head *dest) |
1262 | { | |
1263 | struct list_head *li, *tmp; | |
1264 | list_for_each_safe(li, tmp, source) | |
1265 | list_move(li, dest); | |
1266 | } | |
1267 | ||
f7ba7fe6 | 1268 | void |
9ee305b7 PS |
1269 | cifs_free_llist(struct list_head *llist) |
1270 | { | |
1271 | struct cifsLockInfo *li, *tmp; | |
1272 | list_for_each_entry_safe(li, tmp, llist, llist) { | |
1273 | cifs_del_lock_waiters(li); | |
1274 | list_del(&li->llist); | |
1275 | kfree(li); | |
1276 | } | |
1277 | } | |
1278 | ||
d39a4f71 | 1279 | int |
6d5786a3 PS |
1280 | cifs_unlock_range(struct cifsFileInfo *cfile, struct file_lock *flock, |
1281 | unsigned int xid) | |
9ee305b7 PS |
1282 | { |
1283 | int rc = 0, stored_rc; | |
1284 | int types[] = {LOCKING_ANDX_LARGE_FILES, | |
1285 | LOCKING_ANDX_SHARED_LOCK | LOCKING_ANDX_LARGE_FILES}; | |
1286 | unsigned int i; | |
0013fb4c | 1287 | unsigned int max_num, num, max_buf; |
9ee305b7 PS |
1288 | LOCKING_ANDX_RANGE *buf, *cur; |
1289 | struct cifs_tcon *tcon = tlink_tcon(cfile->tlink); | |
1290 | struct cifsInodeInfo *cinode = CIFS_I(cfile->dentry->d_inode); | |
1291 | struct cifsLockInfo *li, *tmp; | |
1292 | __u64 length = 1 + flock->fl_end - flock->fl_start; | |
1293 | struct list_head tmp_llist; | |
1294 | ||
1295 | INIT_LIST_HEAD(&tmp_llist); | |
1296 | ||
0013fb4c PS |
1297 | /* |
1298 | * Accessing maxBuf is racy with cifs_reconnect - need to store value | |
1299 | * and check it for zero before using. | |
1300 | */ | |
1301 | max_buf = tcon->ses->server->maxBuf; | |
1302 | if (!max_buf) | |
1303 | return -EINVAL; | |
1304 | ||
1305 | max_num = (max_buf - sizeof(struct smb_hdr)) / | |
1306 | sizeof(LOCKING_ANDX_RANGE); | |
9ee305b7 PS |
1307 | buf = kzalloc(max_num * sizeof(LOCKING_ANDX_RANGE), GFP_KERNEL); |
1308 | if (!buf) | |
1309 | return -ENOMEM; | |
1310 | ||
1b4b55a1 | 1311 | down_write(&cinode->lock_sem); |
9ee305b7 PS |
1312 | for (i = 0; i < 2; i++) { |
1313 | cur = buf; | |
1314 | num = 0; | |
f45d3416 | 1315 | list_for_each_entry_safe(li, tmp, &cfile->llist->locks, llist) { |
9ee305b7 PS |
1316 | if (flock->fl_start > li->offset || |
1317 | (flock->fl_start + length) < | |
1318 | (li->offset + li->length)) | |
1319 | continue; | |
1320 | if (current->tgid != li->pid) | |
1321 | continue; | |
9ee305b7 PS |
1322 | if (types[i] != li->type) |
1323 | continue; | |
ea319d57 | 1324 | if (cinode->can_cache_brlcks) { |
9ee305b7 PS |
1325 | /* |
1326 | * We can cache brlock requests - simply remove | |
fbd35aca | 1327 | * a lock from the file's list. |
9ee305b7 PS |
1328 | */ |
1329 | list_del(&li->llist); | |
1330 | cifs_del_lock_waiters(li); | |
1331 | kfree(li); | |
ea319d57 | 1332 | continue; |
9ee305b7 | 1333 | } |
ea319d57 PS |
1334 | cur->Pid = cpu_to_le16(li->pid); |
1335 | cur->LengthLow = cpu_to_le32((u32)li->length); | |
1336 | cur->LengthHigh = cpu_to_le32((u32)(li->length>>32)); | |
1337 | cur->OffsetLow = cpu_to_le32((u32)li->offset); | |
1338 | cur->OffsetHigh = cpu_to_le32((u32)(li->offset>>32)); | |
1339 | /* | |
1340 | * We need to save a lock here to let us add it again to | |
1341 | * the file's list if the unlock range request fails on | |
1342 | * the server. | |
1343 | */ | |
1344 | list_move(&li->llist, &tmp_llist); | |
1345 | if (++num == max_num) { | |
4b4de76e PS |
1346 | stored_rc = cifs_lockv(xid, tcon, |
1347 | cfile->fid.netfid, | |
ea319d57 PS |
1348 | li->type, num, 0, buf); |
1349 | if (stored_rc) { | |
1350 | /* | |
1351 | * We failed on the unlock range | |
1352 | * request - add all locks from the tmp | |
1353 | * list to the head of the file's list. | |
1354 | */ | |
1355 | cifs_move_llist(&tmp_llist, | |
f45d3416 | 1356 | &cfile->llist->locks); |
ea319d57 PS |
1357 | rc = stored_rc; |
1358 | } else | |
1359 | /* | |
1360 | * The unlock range request succeed - | |
1361 | * free the tmp list. | |
1362 | */ | |
1363 | cifs_free_llist(&tmp_llist); | |
1364 | cur = buf; | |
1365 | num = 0; | |
1366 | } else | |
1367 | cur++; | |
9ee305b7 PS |
1368 | } |
1369 | if (num) { | |
4b4de76e | 1370 | stored_rc = cifs_lockv(xid, tcon, cfile->fid.netfid, |
9ee305b7 PS |
1371 | types[i], num, 0, buf); |
1372 | if (stored_rc) { | |
f45d3416 PS |
1373 | cifs_move_llist(&tmp_llist, |
1374 | &cfile->llist->locks); | |
9ee305b7 PS |
1375 | rc = stored_rc; |
1376 | } else | |
1377 | cifs_free_llist(&tmp_llist); | |
1378 | } | |
1379 | } | |
1380 | ||
1b4b55a1 | 1381 | up_write(&cinode->lock_sem); |
9ee305b7 PS |
1382 | kfree(buf); |
1383 | return rc; | |
1384 | } | |
1385 | ||
03776f45 | 1386 | static int |
f45d3416 | 1387 | cifs_setlk(struct file *file, struct file_lock *flock, __u32 type, |
6d5786a3 PS |
1388 | bool wait_flag, bool posix_lck, int lock, int unlock, |
1389 | unsigned int xid) | |
03776f45 PS |
1390 | { |
1391 | int rc = 0; | |
1392 | __u64 length = 1 + flock->fl_end - flock->fl_start; | |
1393 | struct cifsFileInfo *cfile = (struct cifsFileInfo *)file->private_data; | |
1394 | struct cifs_tcon *tcon = tlink_tcon(cfile->tlink); | |
106dc538 | 1395 | struct TCP_Server_Info *server = tcon->ses->server; |
03776f45 PS |
1396 | |
1397 | if (posix_lck) { | |
08547b03 | 1398 | int posix_lock_type; |
4f6bcec9 PS |
1399 | |
1400 | rc = cifs_posix_lock_set(file, flock); | |
1401 | if (!rc || rc < 0) | |
1402 | return rc; | |
1403 | ||
106dc538 | 1404 | if (type & server->vals->shared_lock_type) |
08547b03 SF |
1405 | posix_lock_type = CIFS_RDLCK; |
1406 | else | |
1407 | posix_lock_type = CIFS_WRLCK; | |
50c2f753 | 1408 | |
03776f45 | 1409 | if (unlock == 1) |
beb84dc8 | 1410 | posix_lock_type = CIFS_UNLCK; |
7ee1af76 | 1411 | |
f45d3416 PS |
1412 | rc = CIFSSMBPosixLock(xid, tcon, cfile->fid.netfid, |
1413 | current->tgid, flock->fl_start, length, | |
1414 | NULL, posix_lock_type, wait_flag); | |
03776f45 PS |
1415 | goto out; |
1416 | } | |
7ee1af76 | 1417 | |
03776f45 | 1418 | if (lock) { |
161ebf9f PS |
1419 | struct cifsLockInfo *lock; |
1420 | ||
fbd35aca | 1421 | lock = cifs_lock_init(flock->fl_start, length, type); |
161ebf9f PS |
1422 | if (!lock) |
1423 | return -ENOMEM; | |
1424 | ||
fbd35aca | 1425 | rc = cifs_lock_add_if(cfile, lock, wait_flag); |
85160e03 | 1426 | if (rc < 0) |
161ebf9f PS |
1427 | kfree(lock); |
1428 | if (rc <= 0) | |
85160e03 PS |
1429 | goto out; |
1430 | ||
d39a4f71 PS |
1431 | rc = server->ops->mand_lock(xid, cfile, flock->fl_start, length, |
1432 | type, 1, 0, wait_flag); | |
161ebf9f PS |
1433 | if (rc) { |
1434 | kfree(lock); | |
1435 | goto out; | |
03776f45 | 1436 | } |
161ebf9f | 1437 | |
fbd35aca | 1438 | cifs_lock_add(cfile, lock); |
9ee305b7 | 1439 | } else if (unlock) |
d39a4f71 | 1440 | rc = server->ops->mand_unlock_range(cfile, flock, xid); |
03776f45 | 1441 | |
03776f45 PS |
1442 | out: |
1443 | if (flock->fl_flags & FL_POSIX) | |
9ebb389d | 1444 | posix_lock_file_wait(file, flock); |
03776f45 PS |
1445 | return rc; |
1446 | } | |
1447 | ||
1448 | int cifs_lock(struct file *file, int cmd, struct file_lock *flock) | |
1449 | { | |
1450 | int rc, xid; | |
1451 | int lock = 0, unlock = 0; | |
1452 | bool wait_flag = false; | |
1453 | bool posix_lck = false; | |
1454 | struct cifs_sb_info *cifs_sb; | |
1455 | struct cifs_tcon *tcon; | |
1456 | struct cifsInodeInfo *cinode; | |
1457 | struct cifsFileInfo *cfile; | |
1458 | __u16 netfid; | |
04a6aa8a | 1459 | __u32 type; |
03776f45 PS |
1460 | |
1461 | rc = -EACCES; | |
6d5786a3 | 1462 | xid = get_xid(); |
03776f45 PS |
1463 | |
1464 | cFYI(1, "Lock parm: 0x%x flockflags: 0x%x flocktype: 0x%x start: %lld " | |
1465 | "end: %lld", cmd, flock->fl_flags, flock->fl_type, | |
1466 | flock->fl_start, flock->fl_end); | |
1467 | ||
03776f45 PS |
1468 | cfile = (struct cifsFileInfo *)file->private_data; |
1469 | tcon = tlink_tcon(cfile->tlink); | |
106dc538 PS |
1470 | |
1471 | cifs_read_flock(flock, &type, &lock, &unlock, &wait_flag, | |
1472 | tcon->ses->server); | |
1473 | ||
1474 | cifs_sb = CIFS_SB(file->f_path.dentry->d_sb); | |
4b4de76e | 1475 | netfid = cfile->fid.netfid; |
03776f45 PS |
1476 | cinode = CIFS_I(file->f_path.dentry->d_inode); |
1477 | ||
29e20f9c | 1478 | if (cap_unix(tcon->ses) && |
03776f45 PS |
1479 | (CIFS_UNIX_FCNTL_CAP & le64_to_cpu(tcon->fsUnixInfo.Capability)) && |
1480 | ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NOPOSIXBRL) == 0)) | |
1481 | posix_lck = true; | |
1482 | /* | |
1483 | * BB add code here to normalize offset and length to account for | |
1484 | * negative length which we can not accept over the wire. | |
1485 | */ | |
1486 | if (IS_GETLK(cmd)) { | |
4f6bcec9 | 1487 | rc = cifs_getlk(file, flock, type, wait_flag, posix_lck, xid); |
6d5786a3 | 1488 | free_xid(xid); |
03776f45 PS |
1489 | return rc; |
1490 | } | |
1491 | ||
1492 | if (!lock && !unlock) { | |
1493 | /* | |
1494 | * if no lock or unlock then nothing to do since we do not | |
1495 | * know what it is | |
1496 | */ | |
6d5786a3 | 1497 | free_xid(xid); |
03776f45 | 1498 | return -EOPNOTSUPP; |
7ee1af76 JA |
1499 | } |
1500 | ||
03776f45 PS |
1501 | rc = cifs_setlk(file, flock, type, wait_flag, posix_lck, lock, unlock, |
1502 | xid); | |
6d5786a3 | 1503 | free_xid(xid); |
1da177e4 LT |
1504 | return rc; |
1505 | } | |
1506 | ||
597b027f JL |
1507 | /* |
1508 | * update the file size (if needed) after a write. Should be called with | |
1509 | * the inode->i_lock held | |
1510 | */ | |
72432ffc | 1511 | void |
fbec9ab9 JL |
1512 | cifs_update_eof(struct cifsInodeInfo *cifsi, loff_t offset, |
1513 | unsigned int bytes_written) | |
1514 | { | |
1515 | loff_t end_of_write = offset + bytes_written; | |
1516 | ||
1517 | if (end_of_write > cifsi->server_eof) | |
1518 | cifsi->server_eof = end_of_write; | |
1519 | } | |
1520 | ||
ba9ad725 PS |
1521 | static ssize_t |
1522 | cifs_write(struct cifsFileInfo *open_file, __u32 pid, const char *write_data, | |
1523 | size_t write_size, loff_t *offset) | |
1da177e4 LT |
1524 | { |
1525 | int rc = 0; | |
1526 | unsigned int bytes_written = 0; | |
1527 | unsigned int total_written; | |
1528 | struct cifs_sb_info *cifs_sb; | |
ba9ad725 PS |
1529 | struct cifs_tcon *tcon; |
1530 | struct TCP_Server_Info *server; | |
6d5786a3 | 1531 | unsigned int xid; |
7da4b49a JL |
1532 | struct dentry *dentry = open_file->dentry; |
1533 | struct cifsInodeInfo *cifsi = CIFS_I(dentry->d_inode); | |
fa2989f4 | 1534 | struct cifs_io_parms io_parms; |
1da177e4 | 1535 | |
7da4b49a | 1536 | cifs_sb = CIFS_SB(dentry->d_sb); |
1da177e4 | 1537 | |
b6b38f70 | 1538 | cFYI(1, "write %zd bytes to offset %lld of %s", write_size, |
ba9ad725 | 1539 | *offset, dentry->d_name.name); |
1da177e4 | 1540 | |
ba9ad725 PS |
1541 | tcon = tlink_tcon(open_file->tlink); |
1542 | server = tcon->ses->server; | |
1543 | ||
1544 | if (!server->ops->sync_write) | |
1545 | return -ENOSYS; | |
50c2f753 | 1546 | |
6d5786a3 | 1547 | xid = get_xid(); |
1da177e4 | 1548 | |
1da177e4 LT |
1549 | for (total_written = 0; write_size > total_written; |
1550 | total_written += bytes_written) { | |
1551 | rc = -EAGAIN; | |
1552 | while (rc == -EAGAIN) { | |
ca83ce3d JL |
1553 | struct kvec iov[2]; |
1554 | unsigned int len; | |
1555 | ||
1da177e4 | 1556 | if (open_file->invalidHandle) { |
1da177e4 LT |
1557 | /* we could deadlock if we called |
1558 | filemap_fdatawait from here so tell | |
fb8c4b14 | 1559 | reopen_file not to flush data to |
1da177e4 | 1560 | server now */ |
15886177 | 1561 | rc = cifs_reopen_file(open_file, false); |
1da177e4 LT |
1562 | if (rc != 0) |
1563 | break; | |
1564 | } | |
ca83ce3d JL |
1565 | |
1566 | len = min((size_t)cifs_sb->wsize, | |
1567 | write_size - total_written); | |
1568 | /* iov[0] is reserved for smb header */ | |
1569 | iov[1].iov_base = (char *)write_data + total_written; | |
1570 | iov[1].iov_len = len; | |
fa2989f4 | 1571 | io_parms.pid = pid; |
ba9ad725 PS |
1572 | io_parms.tcon = tcon; |
1573 | io_parms.offset = *offset; | |
fa2989f4 | 1574 | io_parms.length = len; |
ba9ad725 PS |
1575 | rc = server->ops->sync_write(xid, open_file, &io_parms, |
1576 | &bytes_written, iov, 1); | |
1da177e4 LT |
1577 | } |
1578 | if (rc || (bytes_written == 0)) { | |
1579 | if (total_written) | |
1580 | break; | |
1581 | else { | |
6d5786a3 | 1582 | free_xid(xid); |
1da177e4 LT |
1583 | return rc; |
1584 | } | |
fbec9ab9 | 1585 | } else { |
597b027f | 1586 | spin_lock(&dentry->d_inode->i_lock); |
ba9ad725 | 1587 | cifs_update_eof(cifsi, *offset, bytes_written); |
597b027f | 1588 | spin_unlock(&dentry->d_inode->i_lock); |
ba9ad725 | 1589 | *offset += bytes_written; |
fbec9ab9 | 1590 | } |
1da177e4 LT |
1591 | } |
1592 | ||
ba9ad725 | 1593 | cifs_stats_bytes_written(tcon, total_written); |
1da177e4 | 1594 | |
7da4b49a JL |
1595 | if (total_written > 0) { |
1596 | spin_lock(&dentry->d_inode->i_lock); | |
ba9ad725 PS |
1597 | if (*offset > dentry->d_inode->i_size) |
1598 | i_size_write(dentry->d_inode, *offset); | |
7da4b49a | 1599 | spin_unlock(&dentry->d_inode->i_lock); |
1da177e4 | 1600 | } |
7da4b49a | 1601 | mark_inode_dirty_sync(dentry->d_inode); |
6d5786a3 | 1602 | free_xid(xid); |
1da177e4 LT |
1603 | return total_written; |
1604 | } | |
1605 | ||
6508d904 JL |
1606 | struct cifsFileInfo *find_readable_file(struct cifsInodeInfo *cifs_inode, |
1607 | bool fsuid_only) | |
630f3f0c SF |
1608 | { |
1609 | struct cifsFileInfo *open_file = NULL; | |
6508d904 JL |
1610 | struct cifs_sb_info *cifs_sb = CIFS_SB(cifs_inode->vfs_inode.i_sb); |
1611 | ||
1612 | /* only filter by fsuid on multiuser mounts */ | |
1613 | if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MULTIUSER)) | |
1614 | fsuid_only = false; | |
630f3f0c | 1615 | |
4477288a | 1616 | spin_lock(&cifs_file_list_lock); |
630f3f0c SF |
1617 | /* we could simply get the first_list_entry since write-only entries |
1618 | are always at the end of the list but since the first entry might | |
1619 | have a close pending, we go through the whole list */ | |
1620 | list_for_each_entry(open_file, &cifs_inode->openFileList, flist) { | |
6508d904 JL |
1621 | if (fsuid_only && open_file->uid != current_fsuid()) |
1622 | continue; | |
2e396b83 | 1623 | if (OPEN_FMODE(open_file->f_flags) & FMODE_READ) { |
630f3f0c SF |
1624 | if (!open_file->invalidHandle) { |
1625 | /* found a good file */ | |
1626 | /* lock it so it will not be closed on us */ | |
764a1b1a | 1627 | cifsFileInfo_get_locked(open_file); |
4477288a | 1628 | spin_unlock(&cifs_file_list_lock); |
630f3f0c SF |
1629 | return open_file; |
1630 | } /* else might as well continue, and look for | |
1631 | another, or simply have the caller reopen it | |
1632 | again rather than trying to fix this handle */ | |
1633 | } else /* write only file */ | |
1634 | break; /* write only files are last so must be done */ | |
1635 | } | |
4477288a | 1636 | spin_unlock(&cifs_file_list_lock); |
630f3f0c SF |
1637 | return NULL; |
1638 | } | |
630f3f0c | 1639 | |
6508d904 JL |
1640 | struct cifsFileInfo *find_writable_file(struct cifsInodeInfo *cifs_inode, |
1641 | bool fsuid_only) | |
6148a742 | 1642 | { |
2c0c2a08 | 1643 | struct cifsFileInfo *open_file, *inv_file = NULL; |
d3892294 | 1644 | struct cifs_sb_info *cifs_sb; |
2846d386 | 1645 | bool any_available = false; |
dd99cd80 | 1646 | int rc; |
2c0c2a08 | 1647 | unsigned int refind = 0; |
6148a742 | 1648 | |
60808233 SF |
1649 | /* Having a null inode here (because mapping->host was set to zero by |
1650 | the VFS or MM) should not happen but we had reports of on oops (due to | |
1651 | it being zero) during stress testcases so we need to check for it */ | |
1652 | ||
fb8c4b14 | 1653 | if (cifs_inode == NULL) { |
b6b38f70 | 1654 | cERROR(1, "Null inode passed to cifs_writeable_file"); |
60808233 SF |
1655 | dump_stack(); |
1656 | return NULL; | |
1657 | } | |
1658 | ||
d3892294 JL |
1659 | cifs_sb = CIFS_SB(cifs_inode->vfs_inode.i_sb); |
1660 | ||
6508d904 JL |
1661 | /* only filter by fsuid on multiuser mounts */ |
1662 | if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MULTIUSER)) | |
1663 | fsuid_only = false; | |
1664 | ||
4477288a | 1665 | spin_lock(&cifs_file_list_lock); |
9b22b0b7 | 1666 | refind_writable: |
2c0c2a08 SP |
1667 | if (refind > MAX_REOPEN_ATT) { |
1668 | spin_unlock(&cifs_file_list_lock); | |
1669 | return NULL; | |
1670 | } | |
6148a742 | 1671 | list_for_each_entry(open_file, &cifs_inode->openFileList, flist) { |
6508d904 JL |
1672 | if (!any_available && open_file->pid != current->tgid) |
1673 | continue; | |
1674 | if (fsuid_only && open_file->uid != current_fsuid()) | |
6148a742 | 1675 | continue; |
2e396b83 | 1676 | if (OPEN_FMODE(open_file->f_flags) & FMODE_WRITE) { |
9b22b0b7 SF |
1677 | if (!open_file->invalidHandle) { |
1678 | /* found a good writable file */ | |
764a1b1a | 1679 | cifsFileInfo_get_locked(open_file); |
4477288a | 1680 | spin_unlock(&cifs_file_list_lock); |
9b22b0b7 | 1681 | return open_file; |
2c0c2a08 SP |
1682 | } else { |
1683 | if (!inv_file) | |
1684 | inv_file = open_file; | |
9b22b0b7 | 1685 | } |
6148a742 SF |
1686 | } |
1687 | } | |
2846d386 JL |
1688 | /* couldn't find useable FH with same pid, try any available */ |
1689 | if (!any_available) { | |
1690 | any_available = true; | |
1691 | goto refind_writable; | |
1692 | } | |
2c0c2a08 SP |
1693 | |
1694 | if (inv_file) { | |
1695 | any_available = false; | |
764a1b1a | 1696 | cifsFileInfo_get_locked(inv_file); |
2c0c2a08 SP |
1697 | } |
1698 | ||
4477288a | 1699 | spin_unlock(&cifs_file_list_lock); |
2c0c2a08 SP |
1700 | |
1701 | if (inv_file) { | |
1702 | rc = cifs_reopen_file(inv_file, false); | |
1703 | if (!rc) | |
1704 | return inv_file; | |
1705 | else { | |
1706 | spin_lock(&cifs_file_list_lock); | |
1707 | list_move_tail(&inv_file->flist, | |
1708 | &cifs_inode->openFileList); | |
1709 | spin_unlock(&cifs_file_list_lock); | |
1710 | cifsFileInfo_put(inv_file); | |
1711 | spin_lock(&cifs_file_list_lock); | |
1712 | ++refind; | |
1713 | goto refind_writable; | |
1714 | } | |
1715 | } | |
1716 | ||
6148a742 SF |
1717 | return NULL; |
1718 | } | |
1719 | ||
1da177e4 LT |
1720 | static int cifs_partialpagewrite(struct page *page, unsigned from, unsigned to) |
1721 | { | |
1722 | struct address_space *mapping = page->mapping; | |
1723 | loff_t offset = (loff_t)page->index << PAGE_CACHE_SHIFT; | |
1724 | char *write_data; | |
1725 | int rc = -EFAULT; | |
1726 | int bytes_written = 0; | |
1da177e4 | 1727 | struct inode *inode; |
6148a742 | 1728 | struct cifsFileInfo *open_file; |
1da177e4 LT |
1729 | |
1730 | if (!mapping || !mapping->host) | |
1731 | return -EFAULT; | |
1732 | ||
1733 | inode = page->mapping->host; | |
1da177e4 LT |
1734 | |
1735 | offset += (loff_t)from; | |
1736 | write_data = kmap(page); | |
1737 | write_data += from; | |
1738 | ||
1739 | if ((to > PAGE_CACHE_SIZE) || (from > to)) { | |
1740 | kunmap(page); | |
1741 | return -EIO; | |
1742 | } | |
1743 | ||
1744 | /* racing with truncate? */ | |
1745 | if (offset > mapping->host->i_size) { | |
1746 | kunmap(page); | |
1747 | return 0; /* don't care */ | |
1748 | } | |
1749 | ||
1750 | /* check to make sure that we are not extending the file */ | |
1751 | if (mapping->host->i_size - offset < (loff_t)to) | |
fb8c4b14 | 1752 | to = (unsigned)(mapping->host->i_size - offset); |
1da177e4 | 1753 | |
6508d904 | 1754 | open_file = find_writable_file(CIFS_I(mapping->host), false); |
6148a742 | 1755 | if (open_file) { |
fa2989f4 PS |
1756 | bytes_written = cifs_write(open_file, open_file->pid, |
1757 | write_data, to - from, &offset); | |
6ab409b5 | 1758 | cifsFileInfo_put(open_file); |
1da177e4 | 1759 | /* Does mm or vfs already set times? */ |
6148a742 | 1760 | inode->i_atime = inode->i_mtime = current_fs_time(inode->i_sb); |
bb5a9a04 | 1761 | if ((bytes_written > 0) && (offset)) |
6148a742 | 1762 | rc = 0; |
bb5a9a04 SF |
1763 | else if (bytes_written < 0) |
1764 | rc = bytes_written; | |
6148a742 | 1765 | } else { |
b6b38f70 | 1766 | cFYI(1, "No writeable filehandles for inode"); |
1da177e4 LT |
1767 | rc = -EIO; |
1768 | } | |
1769 | ||
1770 | kunmap(page); | |
1771 | return rc; | |
1772 | } | |
1773 | ||
1da177e4 | 1774 | static int cifs_writepages(struct address_space *mapping, |
37c0eb46 | 1775 | struct writeback_control *wbc) |
1da177e4 | 1776 | { |
c3d17b63 JL |
1777 | struct cifs_sb_info *cifs_sb = CIFS_SB(mapping->host->i_sb); |
1778 | bool done = false, scanned = false, range_whole = false; | |
1779 | pgoff_t end, index; | |
1780 | struct cifs_writedata *wdata; | |
c9de5c80 | 1781 | struct TCP_Server_Info *server; |
37c0eb46 | 1782 | struct page *page; |
37c0eb46 | 1783 | int rc = 0; |
50c2f753 | 1784 | |
37c0eb46 | 1785 | /* |
c3d17b63 | 1786 | * If wsize is smaller than the page cache size, default to writing |
37c0eb46 SF |
1787 | * one page at a time via cifs_writepage |
1788 | */ | |
1789 | if (cifs_sb->wsize < PAGE_CACHE_SIZE) | |
1790 | return generic_writepages(mapping, wbc); | |
1791 | ||
111ebb6e | 1792 | if (wbc->range_cyclic) { |
37c0eb46 | 1793 | index = mapping->writeback_index; /* Start from prev offset */ |
111ebb6e OH |
1794 | end = -1; |
1795 | } else { | |
1796 | index = wbc->range_start >> PAGE_CACHE_SHIFT; | |
1797 | end = wbc->range_end >> PAGE_CACHE_SHIFT; | |
1798 | if (wbc->range_start == 0 && wbc->range_end == LLONG_MAX) | |
c3d17b63 JL |
1799 | range_whole = true; |
1800 | scanned = true; | |
37c0eb46 SF |
1801 | } |
1802 | retry: | |
c3d17b63 JL |
1803 | while (!done && index <= end) { |
1804 | unsigned int i, nr_pages, found_pages; | |
1805 | pgoff_t next = 0, tofind; | |
1806 | struct page **pages; | |
1807 | ||
1808 | tofind = min((cifs_sb->wsize / PAGE_CACHE_SIZE) - 1, | |
1809 | end - index) + 1; | |
1810 | ||
c2e87640 JL |
1811 | wdata = cifs_writedata_alloc((unsigned int)tofind, |
1812 | cifs_writev_complete); | |
c3d17b63 JL |
1813 | if (!wdata) { |
1814 | rc = -ENOMEM; | |
1815 | break; | |
1816 | } | |
1817 | ||
1818 | /* | |
1819 | * find_get_pages_tag seems to return a max of 256 on each | |
1820 | * iteration, so we must call it several times in order to | |
1821 | * fill the array or the wsize is effectively limited to | |
1822 | * 256 * PAGE_CACHE_SIZE. | |
1823 | */ | |
1824 | found_pages = 0; | |
1825 | pages = wdata->pages; | |
1826 | do { | |
1827 | nr_pages = find_get_pages_tag(mapping, &index, | |
1828 | PAGECACHE_TAG_DIRTY, | |
1829 | tofind, pages); | |
1830 | found_pages += nr_pages; | |
1831 | tofind -= nr_pages; | |
1832 | pages += nr_pages; | |
1833 | } while (nr_pages && tofind && index <= end); | |
1834 | ||
1835 | if (found_pages == 0) { | |
1836 | kref_put(&wdata->refcount, cifs_writedata_release); | |
1837 | break; | |
1838 | } | |
1839 | ||
1840 | nr_pages = 0; | |
1841 | for (i = 0; i < found_pages; i++) { | |
1842 | page = wdata->pages[i]; | |
37c0eb46 SF |
1843 | /* |
1844 | * At this point we hold neither mapping->tree_lock nor | |
1845 | * lock on the page itself: the page may be truncated or | |
1846 | * invalidated (changing page->mapping to NULL), or even | |
1847 | * swizzled back from swapper_space to tmpfs file | |
1848 | * mapping | |
1849 | */ | |
1850 | ||
c3d17b63 | 1851 | if (nr_pages == 0) |
37c0eb46 | 1852 | lock_page(page); |
529ae9aa | 1853 | else if (!trylock_page(page)) |
37c0eb46 SF |
1854 | break; |
1855 | ||
1856 | if (unlikely(page->mapping != mapping)) { | |
1857 | unlock_page(page); | |
1858 | break; | |
1859 | } | |
1860 | ||
111ebb6e | 1861 | if (!wbc->range_cyclic && page->index > end) { |
c3d17b63 | 1862 | done = true; |
37c0eb46 SF |
1863 | unlock_page(page); |
1864 | break; | |
1865 | } | |
1866 | ||
1867 | if (next && (page->index != next)) { | |
1868 | /* Not next consecutive page */ | |
1869 | unlock_page(page); | |
1870 | break; | |
1871 | } | |
1872 | ||
1873 | if (wbc->sync_mode != WB_SYNC_NONE) | |
1874 | wait_on_page_writeback(page); | |
1875 | ||
1876 | if (PageWriteback(page) || | |
cb876f45 | 1877 | !clear_page_dirty_for_io(page)) { |
37c0eb46 SF |
1878 | unlock_page(page); |
1879 | break; | |
1880 | } | |
84d2f07e | 1881 | |
cb876f45 LT |
1882 | /* |
1883 | * This actually clears the dirty bit in the radix tree. | |
1884 | * See cifs_writepage() for more commentary. | |
1885 | */ | |
1886 | set_page_writeback(page); | |
1887 | ||
3a98b861 | 1888 | if (page_offset(page) >= i_size_read(mapping->host)) { |
c3d17b63 | 1889 | done = true; |
84d2f07e | 1890 | unlock_page(page); |
cb876f45 | 1891 | end_page_writeback(page); |
84d2f07e SF |
1892 | break; |
1893 | } | |
1894 | ||
c3d17b63 JL |
1895 | wdata->pages[i] = page; |
1896 | next = page->index + 1; | |
1897 | ++nr_pages; | |
1898 | } | |
37c0eb46 | 1899 | |
c3d17b63 JL |
1900 | /* reset index to refind any pages skipped */ |
1901 | if (nr_pages == 0) | |
1902 | index = wdata->pages[0]->index + 1; | |
84d2f07e | 1903 | |
c3d17b63 JL |
1904 | /* put any pages we aren't going to use */ |
1905 | for (i = nr_pages; i < found_pages; i++) { | |
1906 | page_cache_release(wdata->pages[i]); | |
1907 | wdata->pages[i] = NULL; | |
1908 | } | |
37c0eb46 | 1909 | |
c3d17b63 JL |
1910 | /* nothing to write? */ |
1911 | if (nr_pages == 0) { | |
1912 | kref_put(&wdata->refcount, cifs_writedata_release); | |
1913 | continue; | |
37c0eb46 | 1914 | } |
fbec9ab9 | 1915 | |
c3d17b63 JL |
1916 | wdata->sync_mode = wbc->sync_mode; |
1917 | wdata->nr_pages = nr_pages; | |
1918 | wdata->offset = page_offset(wdata->pages[0]); | |
eddb079d JL |
1919 | wdata->pagesz = PAGE_CACHE_SIZE; |
1920 | wdata->tailsz = | |
3a98b861 JL |
1921 | min(i_size_read(mapping->host) - |
1922 | page_offset(wdata->pages[nr_pages - 1]), | |
eddb079d JL |
1923 | (loff_t)PAGE_CACHE_SIZE); |
1924 | wdata->bytes = ((nr_pages - 1) * PAGE_CACHE_SIZE) + | |
1925 | wdata->tailsz; | |
941b853d | 1926 | |
c3d17b63 JL |
1927 | do { |
1928 | if (wdata->cfile != NULL) | |
1929 | cifsFileInfo_put(wdata->cfile); | |
1930 | wdata->cfile = find_writable_file(CIFS_I(mapping->host), | |
1931 | false); | |
1932 | if (!wdata->cfile) { | |
1933 | cERROR(1, "No writable handles for inode"); | |
1934 | rc = -EBADF; | |
1935 | break; | |
941b853d | 1936 | } |
fe5f5d2e | 1937 | wdata->pid = wdata->cfile->pid; |
c9de5c80 PS |
1938 | server = tlink_tcon(wdata->cfile->tlink)->ses->server; |
1939 | rc = server->ops->async_writev(wdata); | |
c3d17b63 | 1940 | } while (wbc->sync_mode == WB_SYNC_ALL && rc == -EAGAIN); |
941b853d | 1941 | |
c3d17b63 JL |
1942 | for (i = 0; i < nr_pages; ++i) |
1943 | unlock_page(wdata->pages[i]); | |
f3983c21 | 1944 | |
c3d17b63 JL |
1945 | /* send failure -- clean up the mess */ |
1946 | if (rc != 0) { | |
1947 | for (i = 0; i < nr_pages; ++i) { | |
941b853d | 1948 | if (rc == -EAGAIN) |
c3d17b63 JL |
1949 | redirty_page_for_writepage(wbc, |
1950 | wdata->pages[i]); | |
1951 | else | |
1952 | SetPageError(wdata->pages[i]); | |
1953 | end_page_writeback(wdata->pages[i]); | |
1954 | page_cache_release(wdata->pages[i]); | |
37c0eb46 | 1955 | } |
941b853d JL |
1956 | if (rc != -EAGAIN) |
1957 | mapping_set_error(mapping, rc); | |
c3d17b63 JL |
1958 | } |
1959 | kref_put(&wdata->refcount, cifs_writedata_release); | |
941b853d | 1960 | |
c3d17b63 JL |
1961 | wbc->nr_to_write -= nr_pages; |
1962 | if (wbc->nr_to_write <= 0) | |
1963 | done = true; | |
b066a48c | 1964 | |
c3d17b63 | 1965 | index = next; |
37c0eb46 | 1966 | } |
c3d17b63 | 1967 | |
37c0eb46 SF |
1968 | if (!scanned && !done) { |
1969 | /* | |
1970 | * We hit the last page and there is more work to be done: wrap | |
1971 | * back to the start of the file | |
1972 | */ | |
c3d17b63 | 1973 | scanned = true; |
37c0eb46 SF |
1974 | index = 0; |
1975 | goto retry; | |
1976 | } | |
c3d17b63 | 1977 | |
111ebb6e | 1978 | if (wbc->range_cyclic || (range_whole && wbc->nr_to_write > 0)) |
37c0eb46 SF |
1979 | mapping->writeback_index = index; |
1980 | ||
1da177e4 LT |
1981 | return rc; |
1982 | } | |
1da177e4 | 1983 | |
9ad1506b PS |
1984 | static int |
1985 | cifs_writepage_locked(struct page *page, struct writeback_control *wbc) | |
1da177e4 | 1986 | { |
9ad1506b | 1987 | int rc; |
6d5786a3 | 1988 | unsigned int xid; |
1da177e4 | 1989 | |
6d5786a3 | 1990 | xid = get_xid(); |
1da177e4 LT |
1991 | /* BB add check for wbc flags */ |
1992 | page_cache_get(page); | |
ad7a2926 | 1993 | if (!PageUptodate(page)) |
b6b38f70 | 1994 | cFYI(1, "ppw - page not up to date"); |
cb876f45 LT |
1995 | |
1996 | /* | |
1997 | * Set the "writeback" flag, and clear "dirty" in the radix tree. | |
1998 | * | |
1999 | * A writepage() implementation always needs to do either this, | |
2000 | * or re-dirty the page with "redirty_page_for_writepage()" in | |
2001 | * the case of a failure. | |
2002 | * | |
2003 | * Just unlocking the page will cause the radix tree tag-bits | |
2004 | * to fail to update with the state of the page correctly. | |
2005 | */ | |
fb8c4b14 | 2006 | set_page_writeback(page); |
9ad1506b | 2007 | retry_write: |
1da177e4 | 2008 | rc = cifs_partialpagewrite(page, 0, PAGE_CACHE_SIZE); |
9ad1506b PS |
2009 | if (rc == -EAGAIN && wbc->sync_mode == WB_SYNC_ALL) |
2010 | goto retry_write; | |
2011 | else if (rc == -EAGAIN) | |
2012 | redirty_page_for_writepage(wbc, page); | |
2013 | else if (rc != 0) | |
2014 | SetPageError(page); | |
2015 | else | |
2016 | SetPageUptodate(page); | |
cb876f45 LT |
2017 | end_page_writeback(page); |
2018 | page_cache_release(page); | |
6d5786a3 | 2019 | free_xid(xid); |
1da177e4 LT |
2020 | return rc; |
2021 | } | |
2022 | ||
9ad1506b PS |
2023 | static int cifs_writepage(struct page *page, struct writeback_control *wbc) |
2024 | { | |
2025 | int rc = cifs_writepage_locked(page, wbc); | |
2026 | unlock_page(page); | |
2027 | return rc; | |
2028 | } | |
2029 | ||
d9414774 NP |
2030 | static int cifs_write_end(struct file *file, struct address_space *mapping, |
2031 | loff_t pos, unsigned len, unsigned copied, | |
2032 | struct page *page, void *fsdata) | |
1da177e4 | 2033 | { |
d9414774 NP |
2034 | int rc; |
2035 | struct inode *inode = mapping->host; | |
d4ffff1f PS |
2036 | struct cifsFileInfo *cfile = file->private_data; |
2037 | struct cifs_sb_info *cifs_sb = CIFS_SB(cfile->dentry->d_sb); | |
2038 | __u32 pid; | |
2039 | ||
2040 | if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_RWPIDFORWARD) | |
2041 | pid = cfile->pid; | |
2042 | else | |
2043 | pid = current->tgid; | |
1da177e4 | 2044 | |
b6b38f70 JP |
2045 | cFYI(1, "write_end for page %p from pos %lld with %d bytes", |
2046 | page, pos, copied); | |
d9414774 | 2047 | |
a98ee8c1 JL |
2048 | if (PageChecked(page)) { |
2049 | if (copied == len) | |
2050 | SetPageUptodate(page); | |
2051 | ClearPageChecked(page); | |
2052 | } else if (!PageUptodate(page) && copied == PAGE_CACHE_SIZE) | |
d9414774 | 2053 | SetPageUptodate(page); |
ad7a2926 | 2054 | |
1da177e4 | 2055 | if (!PageUptodate(page)) { |
d9414774 NP |
2056 | char *page_data; |
2057 | unsigned offset = pos & (PAGE_CACHE_SIZE - 1); | |
6d5786a3 | 2058 | unsigned int xid; |
d9414774 | 2059 | |
6d5786a3 | 2060 | xid = get_xid(); |
1da177e4 LT |
2061 | /* this is probably better than directly calling |
2062 | partialpage_write since in this function the file handle is | |
2063 | known which we might as well leverage */ | |
2064 | /* BB check if anything else missing out of ppw | |
2065 | such as updating last write time */ | |
2066 | page_data = kmap(page); | |
d4ffff1f | 2067 | rc = cifs_write(cfile, pid, page_data + offset, copied, &pos); |
d9414774 | 2068 | /* if (rc < 0) should we set writebehind rc? */ |
1da177e4 | 2069 | kunmap(page); |
d9414774 | 2070 | |
6d5786a3 | 2071 | free_xid(xid); |
fb8c4b14 | 2072 | } else { |
d9414774 NP |
2073 | rc = copied; |
2074 | pos += copied; | |
1da177e4 LT |
2075 | set_page_dirty(page); |
2076 | } | |
2077 | ||
d9414774 NP |
2078 | if (rc > 0) { |
2079 | spin_lock(&inode->i_lock); | |
2080 | if (pos > inode->i_size) | |
2081 | i_size_write(inode, pos); | |
2082 | spin_unlock(&inode->i_lock); | |
2083 | } | |
2084 | ||
2085 | unlock_page(page); | |
2086 | page_cache_release(page); | |
2087 | ||
1da177e4 LT |
2088 | return rc; |
2089 | } | |
2090 | ||
02c24a82 JB |
2091 | int cifs_strict_fsync(struct file *file, loff_t start, loff_t end, |
2092 | int datasync) | |
1da177e4 | 2093 | { |
6d5786a3 | 2094 | unsigned int xid; |
1da177e4 | 2095 | int rc = 0; |
96daf2b0 | 2096 | struct cifs_tcon *tcon; |
1d8c4c00 | 2097 | struct TCP_Server_Info *server; |
c21dfb69 | 2098 | struct cifsFileInfo *smbfile = file->private_data; |
e6a00296 | 2099 | struct inode *inode = file->f_path.dentry->d_inode; |
8be7e6ba | 2100 | struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb); |
1da177e4 | 2101 | |
02c24a82 JB |
2102 | rc = filemap_write_and_wait_range(inode->i_mapping, start, end); |
2103 | if (rc) | |
2104 | return rc; | |
2105 | mutex_lock(&inode->i_mutex); | |
2106 | ||
6d5786a3 | 2107 | xid = get_xid(); |
1da177e4 | 2108 | |
b6b38f70 | 2109 | cFYI(1, "Sync file - name: %s datasync: 0x%x", |
7ea80859 | 2110 | file->f_path.dentry->d_name.name, datasync); |
50c2f753 | 2111 | |
6feb9891 PS |
2112 | if (!CIFS_I(inode)->clientCanCacheRead) { |
2113 | rc = cifs_invalidate_mapping(inode); | |
2114 | if (rc) { | |
2115 | cFYI(1, "rc: %d during invalidate phase", rc); | |
2116 | rc = 0; /* don't care about it in fsync */ | |
2117 | } | |
2118 | } | |
eb4b756b | 2119 | |
8be7e6ba | 2120 | tcon = tlink_tcon(smbfile->tlink); |
1d8c4c00 PS |
2121 | if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NOSSYNC)) { |
2122 | server = tcon->ses->server; | |
2123 | if (server->ops->flush) | |
2124 | rc = server->ops->flush(xid, tcon, &smbfile->fid); | |
2125 | else | |
2126 | rc = -ENOSYS; | |
2127 | } | |
8be7e6ba | 2128 | |
6d5786a3 | 2129 | free_xid(xid); |
02c24a82 | 2130 | mutex_unlock(&inode->i_mutex); |
8be7e6ba PS |
2131 | return rc; |
2132 | } | |
2133 | ||
02c24a82 | 2134 | int cifs_fsync(struct file *file, loff_t start, loff_t end, int datasync) |
8be7e6ba | 2135 | { |
6d5786a3 | 2136 | unsigned int xid; |
8be7e6ba | 2137 | int rc = 0; |
96daf2b0 | 2138 | struct cifs_tcon *tcon; |
1d8c4c00 | 2139 | struct TCP_Server_Info *server; |
8be7e6ba PS |
2140 | struct cifsFileInfo *smbfile = file->private_data; |
2141 | struct cifs_sb_info *cifs_sb = CIFS_SB(file->f_path.dentry->d_sb); | |
02c24a82 JB |
2142 | struct inode *inode = file->f_mapping->host; |
2143 | ||
2144 | rc = filemap_write_and_wait_range(inode->i_mapping, start, end); | |
2145 | if (rc) | |
2146 | return rc; | |
2147 | mutex_lock(&inode->i_mutex); | |
8be7e6ba | 2148 | |
6d5786a3 | 2149 | xid = get_xid(); |
8be7e6ba PS |
2150 | |
2151 | cFYI(1, "Sync file - name: %s datasync: 0x%x", | |
2152 | file->f_path.dentry->d_name.name, datasync); | |
2153 | ||
2154 | tcon = tlink_tcon(smbfile->tlink); | |
1d8c4c00 PS |
2155 | if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NOSSYNC)) { |
2156 | server = tcon->ses->server; | |
2157 | if (server->ops->flush) | |
2158 | rc = server->ops->flush(xid, tcon, &smbfile->fid); | |
2159 | else | |
2160 | rc = -ENOSYS; | |
2161 | } | |
b298f223 | 2162 | |
6d5786a3 | 2163 | free_xid(xid); |
02c24a82 | 2164 | mutex_unlock(&inode->i_mutex); |
1da177e4 LT |
2165 | return rc; |
2166 | } | |
2167 | ||
1da177e4 LT |
2168 | /* |
2169 | * As file closes, flush all cached write data for this inode checking | |
2170 | * for write behind errors. | |
2171 | */ | |
75e1fcc0 | 2172 | int cifs_flush(struct file *file, fl_owner_t id) |
1da177e4 | 2173 | { |
fb8c4b14 | 2174 | struct inode *inode = file->f_path.dentry->d_inode; |
1da177e4 LT |
2175 | int rc = 0; |
2176 | ||
eb4b756b | 2177 | if (file->f_mode & FMODE_WRITE) |
d3f1322a | 2178 | rc = filemap_write_and_wait(inode->i_mapping); |
50c2f753 | 2179 | |
b6b38f70 | 2180 | cFYI(1, "Flush inode %p file %p rc %d", inode, file, rc); |
1da177e4 LT |
2181 | |
2182 | return rc; | |
2183 | } | |
2184 | ||
72432ffc PS |
2185 | static int |
2186 | cifs_write_allocate_pages(struct page **pages, unsigned long num_pages) | |
2187 | { | |
2188 | int rc = 0; | |
2189 | unsigned long i; | |
2190 | ||
2191 | for (i = 0; i < num_pages; i++) { | |
e94f7ba1 | 2192 | pages[i] = alloc_page(GFP_KERNEL|__GFP_HIGHMEM); |
72432ffc PS |
2193 | if (!pages[i]) { |
2194 | /* | |
2195 | * save number of pages we have already allocated and | |
2196 | * return with ENOMEM error | |
2197 | */ | |
2198 | num_pages = i; | |
2199 | rc = -ENOMEM; | |
e94f7ba1 | 2200 | break; |
72432ffc PS |
2201 | } |
2202 | } | |
2203 | ||
e94f7ba1 JL |
2204 | if (rc) { |
2205 | for (i = 0; i < num_pages; i++) | |
2206 | put_page(pages[i]); | |
2207 | } | |
72432ffc PS |
2208 | return rc; |
2209 | } | |
2210 | ||
2211 | static inline | |
2212 | size_t get_numpages(const size_t wsize, const size_t len, size_t *cur_len) | |
2213 | { | |
2214 | size_t num_pages; | |
2215 | size_t clen; | |
2216 | ||
2217 | clen = min_t(const size_t, len, wsize); | |
a7103b99 | 2218 | num_pages = DIV_ROUND_UP(clen, PAGE_SIZE); |
72432ffc PS |
2219 | |
2220 | if (cur_len) | |
2221 | *cur_len = clen; | |
2222 | ||
2223 | return num_pages; | |
2224 | } | |
2225 | ||
da82f7e7 JL |
2226 | static void |
2227 | cifs_uncached_writev_complete(struct work_struct *work) | |
2228 | { | |
2229 | int i; | |
2230 | struct cifs_writedata *wdata = container_of(work, | |
2231 | struct cifs_writedata, work); | |
2232 | struct inode *inode = wdata->cfile->dentry->d_inode; | |
2233 | struct cifsInodeInfo *cifsi = CIFS_I(inode); | |
2234 | ||
2235 | spin_lock(&inode->i_lock); | |
2236 | cifs_update_eof(cifsi, wdata->offset, wdata->bytes); | |
2237 | if (cifsi->server_eof > inode->i_size) | |
2238 | i_size_write(inode, cifsi->server_eof); | |
2239 | spin_unlock(&inode->i_lock); | |
2240 | ||
2241 | complete(&wdata->done); | |
2242 | ||
2243 | if (wdata->result != -EAGAIN) { | |
2244 | for (i = 0; i < wdata->nr_pages; i++) | |
2245 | put_page(wdata->pages[i]); | |
2246 | } | |
2247 | ||
2248 | kref_put(&wdata->refcount, cifs_writedata_release); | |
2249 | } | |
2250 | ||
2251 | /* attempt to send write to server, retry on any -EAGAIN errors */ | |
2252 | static int | |
2253 | cifs_uncached_retry_writev(struct cifs_writedata *wdata) | |
2254 | { | |
2255 | int rc; | |
c9de5c80 PS |
2256 | struct TCP_Server_Info *server; |
2257 | ||
2258 | server = tlink_tcon(wdata->cfile->tlink)->ses->server; | |
da82f7e7 JL |
2259 | |
2260 | do { | |
2261 | if (wdata->cfile->invalidHandle) { | |
2262 | rc = cifs_reopen_file(wdata->cfile, false); | |
2263 | if (rc != 0) | |
2264 | continue; | |
2265 | } | |
c9de5c80 | 2266 | rc = server->ops->async_writev(wdata); |
da82f7e7 JL |
2267 | } while (rc == -EAGAIN); |
2268 | ||
2269 | return rc; | |
2270 | } | |
2271 | ||
72432ffc PS |
2272 | static ssize_t |
2273 | cifs_iovec_write(struct file *file, const struct iovec *iov, | |
2274 | unsigned long nr_segs, loff_t *poffset) | |
2275 | { | |
da82f7e7 | 2276 | unsigned long nr_pages, i; |
76429c14 PS |
2277 | size_t copied, len, cur_len; |
2278 | ssize_t total_written = 0; | |
3af9d8f2 | 2279 | loff_t offset; |
72432ffc | 2280 | struct iov_iter it; |
72432ffc | 2281 | struct cifsFileInfo *open_file; |
da82f7e7 | 2282 | struct cifs_tcon *tcon; |
72432ffc | 2283 | struct cifs_sb_info *cifs_sb; |
da82f7e7 JL |
2284 | struct cifs_writedata *wdata, *tmp; |
2285 | struct list_head wdata_list; | |
2286 | int rc; | |
2287 | pid_t pid; | |
72432ffc PS |
2288 | |
2289 | len = iov_length(iov, nr_segs); | |
2290 | if (!len) | |
2291 | return 0; | |
2292 | ||
2293 | rc = generic_write_checks(file, poffset, &len, 0); | |
2294 | if (rc) | |
2295 | return rc; | |
2296 | ||
da82f7e7 | 2297 | INIT_LIST_HEAD(&wdata_list); |
72432ffc | 2298 | cifs_sb = CIFS_SB(file->f_path.dentry->d_sb); |
72432ffc | 2299 | open_file = file->private_data; |
da82f7e7 | 2300 | tcon = tlink_tcon(open_file->tlink); |
c9de5c80 PS |
2301 | |
2302 | if (!tcon->ses->server->ops->async_writev) | |
2303 | return -ENOSYS; | |
2304 | ||
3af9d8f2 | 2305 | offset = *poffset; |
d4ffff1f PS |
2306 | |
2307 | if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_RWPIDFORWARD) | |
2308 | pid = open_file->pid; | |
2309 | else | |
2310 | pid = current->tgid; | |
2311 | ||
72432ffc | 2312 | iov_iter_init(&it, iov, nr_segs, len, 0); |
72432ffc | 2313 | do { |
da82f7e7 JL |
2314 | size_t save_len; |
2315 | ||
2316 | nr_pages = get_numpages(cifs_sb->wsize, len, &cur_len); | |
2317 | wdata = cifs_writedata_alloc(nr_pages, | |
2318 | cifs_uncached_writev_complete); | |
2319 | if (!wdata) { | |
2320 | rc = -ENOMEM; | |
2321 | break; | |
2322 | } | |
2323 | ||
2324 | rc = cifs_write_allocate_pages(wdata->pages, nr_pages); | |
2325 | if (rc) { | |
2326 | kfree(wdata); | |
2327 | break; | |
2328 | } | |
2329 | ||
2330 | save_len = cur_len; | |
2331 | for (i = 0; i < nr_pages; i++) { | |
2332 | copied = min_t(const size_t, cur_len, PAGE_SIZE); | |
2333 | copied = iov_iter_copy_from_user(wdata->pages[i], &it, | |
2334 | 0, copied); | |
72432ffc PS |
2335 | cur_len -= copied; |
2336 | iov_iter_advance(&it, copied); | |
72432ffc | 2337 | } |
72432ffc PS |
2338 | cur_len = save_len - cur_len; |
2339 | ||
da82f7e7 JL |
2340 | wdata->sync_mode = WB_SYNC_ALL; |
2341 | wdata->nr_pages = nr_pages; | |
2342 | wdata->offset = (__u64)offset; | |
2343 | wdata->cfile = cifsFileInfo_get(open_file); | |
2344 | wdata->pid = pid; | |
2345 | wdata->bytes = cur_len; | |
eddb079d JL |
2346 | wdata->pagesz = PAGE_SIZE; |
2347 | wdata->tailsz = cur_len - ((nr_pages - 1) * PAGE_SIZE); | |
da82f7e7 JL |
2348 | rc = cifs_uncached_retry_writev(wdata); |
2349 | if (rc) { | |
2350 | kref_put(&wdata->refcount, cifs_writedata_release); | |
72432ffc PS |
2351 | break; |
2352 | } | |
2353 | ||
da82f7e7 JL |
2354 | list_add_tail(&wdata->list, &wdata_list); |
2355 | offset += cur_len; | |
2356 | len -= cur_len; | |
72432ffc PS |
2357 | } while (len > 0); |
2358 | ||
da82f7e7 JL |
2359 | /* |
2360 | * If at least one write was successfully sent, then discard any rc | |
2361 | * value from the later writes. If the other write succeeds, then | |
2362 | * we'll end up returning whatever was written. If it fails, then | |
2363 | * we'll get a new rc value from that. | |
2364 | */ | |
2365 | if (!list_empty(&wdata_list)) | |
2366 | rc = 0; | |
2367 | ||
2368 | /* | |
2369 | * Wait for and collect replies for any successful sends in order of | |
2370 | * increasing offset. Once an error is hit or we get a fatal signal | |
2371 | * while waiting, then return without waiting for any more replies. | |
2372 | */ | |
2373 | restart_loop: | |
2374 | list_for_each_entry_safe(wdata, tmp, &wdata_list, list) { | |
2375 | if (!rc) { | |
2376 | /* FIXME: freezable too? */ | |
2377 | rc = wait_for_completion_killable(&wdata->done); | |
2378 | if (rc) | |
2379 | rc = -EINTR; | |
2380 | else if (wdata->result) | |
2381 | rc = wdata->result; | |
2382 | else | |
2383 | total_written += wdata->bytes; | |
2384 | ||
2385 | /* resend call if it's a retryable error */ | |
2386 | if (rc == -EAGAIN) { | |
2387 | rc = cifs_uncached_retry_writev(wdata); | |
2388 | goto restart_loop; | |
2389 | } | |
2390 | } | |
2391 | list_del_init(&wdata->list); | |
2392 | kref_put(&wdata->refcount, cifs_writedata_release); | |
72432ffc PS |
2393 | } |
2394 | ||
da82f7e7 JL |
2395 | if (total_written > 0) |
2396 | *poffset += total_written; | |
72432ffc | 2397 | |
da82f7e7 JL |
2398 | cifs_stats_bytes_written(tcon, total_written); |
2399 | return total_written ? total_written : (ssize_t)rc; | |
72432ffc PS |
2400 | } |
2401 | ||
0b81c1c4 | 2402 | ssize_t cifs_user_writev(struct kiocb *iocb, const struct iovec *iov, |
72432ffc PS |
2403 | unsigned long nr_segs, loff_t pos) |
2404 | { | |
2405 | ssize_t written; | |
2406 | struct inode *inode; | |
2407 | ||
2408 | inode = iocb->ki_filp->f_path.dentry->d_inode; | |
2409 | ||
2410 | /* | |
2411 | * BB - optimize the way when signing is disabled. We can drop this | |
2412 | * extra memory-to-memory copying and use iovec buffers for constructing | |
2413 | * write request. | |
2414 | */ | |
2415 | ||
2416 | written = cifs_iovec_write(iocb->ki_filp, iov, nr_segs, &pos); | |
2417 | if (written > 0) { | |
2418 | CIFS_I(inode)->invalid_mapping = true; | |
2419 | iocb->ki_pos = pos; | |
2420 | } | |
2421 | ||
2422 | return written; | |
2423 | } | |
2424 | ||
579f9053 PS |
2425 | static ssize_t |
2426 | cifs_writev(struct kiocb *iocb, const struct iovec *iov, | |
2427 | unsigned long nr_segs, loff_t pos) | |
72432ffc | 2428 | { |
579f9053 PS |
2429 | struct file *file = iocb->ki_filp; |
2430 | struct cifsFileInfo *cfile = (struct cifsFileInfo *)file->private_data; | |
2431 | struct inode *inode = file->f_mapping->host; | |
2432 | struct cifsInodeInfo *cinode = CIFS_I(inode); | |
2433 | struct TCP_Server_Info *server = tlink_tcon(cfile->tlink)->ses->server; | |
2434 | ssize_t rc = -EACCES; | |
72432ffc | 2435 | |
579f9053 | 2436 | BUG_ON(iocb->ki_pos != pos); |
72432ffc | 2437 | |
579f9053 PS |
2438 | sb_start_write(inode->i_sb); |
2439 | ||
2440 | /* | |
2441 | * We need to hold the sem to be sure nobody modifies lock list | |
2442 | * with a brlock that prevents writing. | |
2443 | */ | |
2444 | down_read(&cinode->lock_sem); | |
2445 | if (!cifs_find_lock_conflict(cfile, pos, iov_length(iov, nr_segs), | |
2446 | server->vals->exclusive_lock_type, NULL, | |
2447 | true)) { | |
2448 | mutex_lock(&inode->i_mutex); | |
2449 | rc = __generic_file_aio_write(iocb, iov, nr_segs, | |
2450 | &iocb->ki_pos); | |
2451 | mutex_unlock(&inode->i_mutex); | |
2452 | } | |
2453 | ||
2454 | if (rc > 0 || rc == -EIOCBQUEUED) { | |
2455 | ssize_t err; | |
2456 | ||
2457 | err = generic_write_sync(file, pos, rc); | |
2458 | if (err < 0 && rc > 0) | |
2459 | rc = err; | |
2460 | } | |
2461 | ||
2462 | up_read(&cinode->lock_sem); | |
2463 | sb_end_write(inode->i_sb); | |
2464 | return rc; | |
2465 | } | |
2466 | ||
2467 | ssize_t | |
2468 | cifs_strict_writev(struct kiocb *iocb, const struct iovec *iov, | |
2469 | unsigned long nr_segs, loff_t pos) | |
2470 | { | |
2471 | struct inode *inode = iocb->ki_filp->f_path.dentry->d_inode; | |
2472 | struct cifsInodeInfo *cinode = CIFS_I(inode); | |
2473 | struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb); | |
2474 | struct cifsFileInfo *cfile = (struct cifsFileInfo *) | |
2475 | iocb->ki_filp->private_data; | |
2476 | struct cifs_tcon *tcon = tlink_tcon(cfile->tlink); | |
72432ffc | 2477 | |
25078105 | 2478 | #ifdef CONFIG_CIFS_SMB2 |
72432ffc | 2479 | /* |
25078105 PS |
2480 | * If we have an oplock for read and want to write a data to the file |
2481 | * we need to store it in the page cache and then push it to the server | |
2482 | * to be sure the next read will get a valid data. | |
2483 | */ | |
2484 | if (!cinode->clientCanCacheAll && cinode->clientCanCacheRead) { | |
2485 | ssize_t written; | |
2486 | int rc; | |
2487 | ||
2488 | written = generic_file_aio_write(iocb, iov, nr_segs, pos); | |
2489 | rc = filemap_fdatawrite(inode->i_mapping); | |
2490 | if (rc) | |
2491 | return (ssize_t)rc; | |
2492 | ||
2493 | return written; | |
2494 | } | |
2495 | #endif | |
2496 | ||
2497 | /* | |
2498 | * For non-oplocked files in strict cache mode we need to write the data | |
2499 | * to the server exactly from the pos to pos+len-1 rather than flush all | |
2500 | * affected pages because it may cause a error with mandatory locks on | |
2501 | * these pages but not on the region from pos to ppos+len-1. | |
72432ffc PS |
2502 | */ |
2503 | ||
579f9053 PS |
2504 | if (!cinode->clientCanCacheAll) |
2505 | return cifs_user_writev(iocb, iov, nr_segs, pos); | |
2506 | ||
2507 | if (cap_unix(tcon->ses) && | |
2508 | (CIFS_UNIX_FCNTL_CAP & le64_to_cpu(tcon->fsUnixInfo.Capability)) && | |
2509 | ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NOPOSIXBRL) == 0)) | |
2510 | return generic_file_aio_write(iocb, iov, nr_segs, pos); | |
2511 | ||
2512 | return cifs_writev(iocb, iov, nr_segs, pos); | |
72432ffc PS |
2513 | } |
2514 | ||
0471ca3f | 2515 | static struct cifs_readdata * |
f4e49cd2 | 2516 | cifs_readdata_alloc(unsigned int nr_pages, work_func_t complete) |
0471ca3f JL |
2517 | { |
2518 | struct cifs_readdata *rdata; | |
f4e49cd2 | 2519 | |
c5fab6f4 JL |
2520 | rdata = kzalloc(sizeof(*rdata) + (sizeof(struct page *) * nr_pages), |
2521 | GFP_KERNEL); | |
0471ca3f | 2522 | if (rdata != NULL) { |
6993f74a | 2523 | kref_init(&rdata->refcount); |
1c892549 JL |
2524 | INIT_LIST_HEAD(&rdata->list); |
2525 | init_completion(&rdata->done); | |
0471ca3f | 2526 | INIT_WORK(&rdata->work, complete); |
0471ca3f | 2527 | } |
f4e49cd2 | 2528 | |
0471ca3f JL |
2529 | return rdata; |
2530 | } | |
2531 | ||
6993f74a JL |
2532 | void |
2533 | cifs_readdata_release(struct kref *refcount) | |
0471ca3f | 2534 | { |
6993f74a JL |
2535 | struct cifs_readdata *rdata = container_of(refcount, |
2536 | struct cifs_readdata, refcount); | |
2537 | ||
2538 | if (rdata->cfile) | |
2539 | cifsFileInfo_put(rdata->cfile); | |
2540 | ||
0471ca3f JL |
2541 | kfree(rdata); |
2542 | } | |
2543 | ||
1c892549 | 2544 | static int |
c5fab6f4 | 2545 | cifs_read_allocate_pages(struct cifs_readdata *rdata, unsigned int nr_pages) |
1c892549 JL |
2546 | { |
2547 | int rc = 0; | |
c5fab6f4 | 2548 | struct page *page; |
1c892549 JL |
2549 | unsigned int i; |
2550 | ||
c5fab6f4 | 2551 | for (i = 0; i < nr_pages; i++) { |
1c892549 JL |
2552 | page = alloc_page(GFP_KERNEL|__GFP_HIGHMEM); |
2553 | if (!page) { | |
2554 | rc = -ENOMEM; | |
2555 | break; | |
2556 | } | |
c5fab6f4 | 2557 | rdata->pages[i] = page; |
1c892549 JL |
2558 | } |
2559 | ||
2560 | if (rc) { | |
c5fab6f4 JL |
2561 | for (i = 0; i < nr_pages; i++) { |
2562 | put_page(rdata->pages[i]); | |
2563 | rdata->pages[i] = NULL; | |
1c892549 JL |
2564 | } |
2565 | } | |
2566 | return rc; | |
2567 | } | |
2568 | ||
2569 | static void | |
2570 | cifs_uncached_readdata_release(struct kref *refcount) | |
2571 | { | |
1c892549 JL |
2572 | struct cifs_readdata *rdata = container_of(refcount, |
2573 | struct cifs_readdata, refcount); | |
c5fab6f4 | 2574 | unsigned int i; |
1c892549 | 2575 | |
c5fab6f4 JL |
2576 | for (i = 0; i < rdata->nr_pages; i++) { |
2577 | put_page(rdata->pages[i]); | |
2578 | rdata->pages[i] = NULL; | |
1c892549 JL |
2579 | } |
2580 | cifs_readdata_release(refcount); | |
2581 | } | |
2582 | ||
2a1bb138 JL |
2583 | static int |
2584 | cifs_retry_async_readv(struct cifs_readdata *rdata) | |
2585 | { | |
2586 | int rc; | |
fc9c5966 PS |
2587 | struct TCP_Server_Info *server; |
2588 | ||
2589 | server = tlink_tcon(rdata->cfile->tlink)->ses->server; | |
2a1bb138 JL |
2590 | |
2591 | do { | |
2592 | if (rdata->cfile->invalidHandle) { | |
2593 | rc = cifs_reopen_file(rdata->cfile, true); | |
2594 | if (rc != 0) | |
2595 | continue; | |
2596 | } | |
fc9c5966 | 2597 | rc = server->ops->async_readv(rdata); |
2a1bb138 JL |
2598 | } while (rc == -EAGAIN); |
2599 | ||
2600 | return rc; | |
2601 | } | |
2602 | ||
1c892549 JL |
2603 | /** |
2604 | * cifs_readdata_to_iov - copy data from pages in response to an iovec | |
2605 | * @rdata: the readdata response with list of pages holding data | |
2606 | * @iov: vector in which we should copy the data | |
2607 | * @nr_segs: number of segments in vector | |
2608 | * @offset: offset into file of the first iovec | |
2609 | * @copied: used to return the amount of data copied to the iov | |
2610 | * | |
2611 | * This function copies data from a list of pages in a readdata response into | |
2612 | * an array of iovecs. It will first calculate where the data should go | |
2613 | * based on the info in the readdata and then copy the data into that spot. | |
2614 | */ | |
2615 | static ssize_t | |
2616 | cifs_readdata_to_iov(struct cifs_readdata *rdata, const struct iovec *iov, | |
2617 | unsigned long nr_segs, loff_t offset, ssize_t *copied) | |
2618 | { | |
2619 | int rc = 0; | |
2620 | struct iov_iter ii; | |
2621 | size_t pos = rdata->offset - offset; | |
1c892549 JL |
2622 | ssize_t remaining = rdata->bytes; |
2623 | unsigned char *pdata; | |
c5fab6f4 | 2624 | unsigned int i; |
1c892549 JL |
2625 | |
2626 | /* set up iov_iter and advance to the correct offset */ | |
2627 | iov_iter_init(&ii, iov, nr_segs, iov_length(iov, nr_segs), 0); | |
2628 | iov_iter_advance(&ii, pos); | |
2629 | ||
2630 | *copied = 0; | |
c5fab6f4 | 2631 | for (i = 0; i < rdata->nr_pages; i++) { |
1c892549 | 2632 | ssize_t copy; |
c5fab6f4 | 2633 | struct page *page = rdata->pages[i]; |
1c892549 JL |
2634 | |
2635 | /* copy a whole page or whatever's left */ | |
2636 | copy = min_t(ssize_t, remaining, PAGE_SIZE); | |
2637 | ||
2638 | /* ...but limit it to whatever space is left in the iov */ | |
2639 | copy = min_t(ssize_t, copy, iov_iter_count(&ii)); | |
2640 | ||
2641 | /* go while there's data to be copied and no errors */ | |
2642 | if (copy && !rc) { | |
2643 | pdata = kmap(page); | |
2644 | rc = memcpy_toiovecend(ii.iov, pdata, ii.iov_offset, | |
2645 | (int)copy); | |
2646 | kunmap(page); | |
2647 | if (!rc) { | |
2648 | *copied += copy; | |
2649 | remaining -= copy; | |
2650 | iov_iter_advance(&ii, copy); | |
2651 | } | |
2652 | } | |
1c892549 JL |
2653 | } |
2654 | ||
2655 | return rc; | |
2656 | } | |
2657 | ||
2658 | static void | |
2659 | cifs_uncached_readv_complete(struct work_struct *work) | |
2660 | { | |
2661 | struct cifs_readdata *rdata = container_of(work, | |
2662 | struct cifs_readdata, work); | |
1c892549 JL |
2663 | |
2664 | complete(&rdata->done); | |
2665 | kref_put(&rdata->refcount, cifs_uncached_readdata_release); | |
2666 | } | |
2667 | ||
2668 | static int | |
8321fec4 JL |
2669 | cifs_uncached_read_into_pages(struct TCP_Server_Info *server, |
2670 | struct cifs_readdata *rdata, unsigned int len) | |
1c892549 | 2671 | { |
8321fec4 | 2672 | int total_read = 0, result = 0; |
c5fab6f4 JL |
2673 | unsigned int i; |
2674 | unsigned int nr_pages = rdata->nr_pages; | |
8321fec4 | 2675 | struct kvec iov; |
1c892549 | 2676 | |
8321fec4 | 2677 | rdata->tailsz = PAGE_SIZE; |
c5fab6f4 JL |
2678 | for (i = 0; i < nr_pages; i++) { |
2679 | struct page *page = rdata->pages[i]; | |
2680 | ||
8321fec4 | 2681 | if (len >= PAGE_SIZE) { |
1c892549 | 2682 | /* enough data to fill the page */ |
8321fec4 JL |
2683 | iov.iov_base = kmap(page); |
2684 | iov.iov_len = PAGE_SIZE; | |
2685 | cFYI(1, "%u: iov_base=%p iov_len=%zu", | |
2686 | i, iov.iov_base, iov.iov_len); | |
2687 | len -= PAGE_SIZE; | |
2688 | } else if (len > 0) { | |
1c892549 | 2689 | /* enough for partial page, fill and zero the rest */ |
8321fec4 JL |
2690 | iov.iov_base = kmap(page); |
2691 | iov.iov_len = len; | |
2692 | cFYI(1, "%u: iov_base=%p iov_len=%zu", | |
2693 | i, iov.iov_base, iov.iov_len); | |
2694 | memset(iov.iov_base + len, '\0', PAGE_SIZE - len); | |
2695 | rdata->tailsz = len; | |
2696 | len = 0; | |
1c892549 JL |
2697 | } else { |
2698 | /* no need to hold page hostage */ | |
c5fab6f4 JL |
2699 | rdata->pages[i] = NULL; |
2700 | rdata->nr_pages--; | |
1c892549 | 2701 | put_page(page); |
8321fec4 | 2702 | continue; |
1c892549 | 2703 | } |
8321fec4 JL |
2704 | |
2705 | result = cifs_readv_from_socket(server, &iov, 1, iov.iov_len); | |
2706 | kunmap(page); | |
2707 | if (result < 0) | |
2708 | break; | |
2709 | ||
2710 | total_read += result; | |
1c892549 JL |
2711 | } |
2712 | ||
8321fec4 | 2713 | return total_read > 0 ? total_read : result; |
1c892549 JL |
2714 | } |
2715 | ||
a70307ee PS |
2716 | static ssize_t |
2717 | cifs_iovec_read(struct file *file, const struct iovec *iov, | |
2718 | unsigned long nr_segs, loff_t *poffset) | |
1da177e4 | 2719 | { |
1c892549 | 2720 | ssize_t rc; |
a70307ee | 2721 | size_t len, cur_len; |
1c892549 JL |
2722 | ssize_t total_read = 0; |
2723 | loff_t offset = *poffset; | |
2724 | unsigned int npages; | |
1da177e4 | 2725 | struct cifs_sb_info *cifs_sb; |
1c892549 | 2726 | struct cifs_tcon *tcon; |
1da177e4 | 2727 | struct cifsFileInfo *open_file; |
1c892549 JL |
2728 | struct cifs_readdata *rdata, *tmp; |
2729 | struct list_head rdata_list; | |
2730 | pid_t pid; | |
a70307ee PS |
2731 | |
2732 | if (!nr_segs) | |
2733 | return 0; | |
2734 | ||
2735 | len = iov_length(iov, nr_segs); | |
2736 | if (!len) | |
2737 | return 0; | |
1da177e4 | 2738 | |
1c892549 | 2739 | INIT_LIST_HEAD(&rdata_list); |
e6a00296 | 2740 | cifs_sb = CIFS_SB(file->f_path.dentry->d_sb); |
c21dfb69 | 2741 | open_file = file->private_data; |
1c892549 | 2742 | tcon = tlink_tcon(open_file->tlink); |
1da177e4 | 2743 | |
fc9c5966 PS |
2744 | if (!tcon->ses->server->ops->async_readv) |
2745 | return -ENOSYS; | |
2746 | ||
d4ffff1f PS |
2747 | if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_RWPIDFORWARD) |
2748 | pid = open_file->pid; | |
2749 | else | |
2750 | pid = current->tgid; | |
2751 | ||
ad7a2926 | 2752 | if ((file->f_flags & O_ACCMODE) == O_WRONLY) |
b6b38f70 | 2753 | cFYI(1, "attempting read on write only file instance"); |
ad7a2926 | 2754 | |
1c892549 JL |
2755 | do { |
2756 | cur_len = min_t(const size_t, len - total_read, cifs_sb->rsize); | |
2757 | npages = DIV_ROUND_UP(cur_len, PAGE_SIZE); | |
a70307ee | 2758 | |
1c892549 JL |
2759 | /* allocate a readdata struct */ |
2760 | rdata = cifs_readdata_alloc(npages, | |
2761 | cifs_uncached_readv_complete); | |
2762 | if (!rdata) { | |
2763 | rc = -ENOMEM; | |
2764 | goto error; | |
1da177e4 | 2765 | } |
a70307ee | 2766 | |
c5fab6f4 | 2767 | rc = cifs_read_allocate_pages(rdata, npages); |
1c892549 JL |
2768 | if (rc) |
2769 | goto error; | |
2770 | ||
2771 | rdata->cfile = cifsFileInfo_get(open_file); | |
c5fab6f4 | 2772 | rdata->nr_pages = npages; |
1c892549 JL |
2773 | rdata->offset = offset; |
2774 | rdata->bytes = cur_len; | |
2775 | rdata->pid = pid; | |
8321fec4 JL |
2776 | rdata->pagesz = PAGE_SIZE; |
2777 | rdata->read_into_pages = cifs_uncached_read_into_pages; | |
1c892549 JL |
2778 | |
2779 | rc = cifs_retry_async_readv(rdata); | |
2780 | error: | |
2781 | if (rc) { | |
2782 | kref_put(&rdata->refcount, | |
2783 | cifs_uncached_readdata_release); | |
2784 | break; | |
2785 | } | |
2786 | ||
2787 | list_add_tail(&rdata->list, &rdata_list); | |
2788 | offset += cur_len; | |
2789 | len -= cur_len; | |
2790 | } while (len > 0); | |
2791 | ||
2792 | /* if at least one read request send succeeded, then reset rc */ | |
2793 | if (!list_empty(&rdata_list)) | |
2794 | rc = 0; | |
2795 | ||
2796 | /* the loop below should proceed in the order of increasing offsets */ | |
2797 | restart_loop: | |
2798 | list_for_each_entry_safe(rdata, tmp, &rdata_list, list) { | |
2799 | if (!rc) { | |
2800 | ssize_t copied; | |
2801 | ||
2802 | /* FIXME: freezable sleep too? */ | |
2803 | rc = wait_for_completion_killable(&rdata->done); | |
2804 | if (rc) | |
2805 | rc = -EINTR; | |
2806 | else if (rdata->result) | |
2807 | rc = rdata->result; | |
2808 | else { | |
2809 | rc = cifs_readdata_to_iov(rdata, iov, | |
2810 | nr_segs, *poffset, | |
2811 | &copied); | |
2812 | total_read += copied; | |
2813 | } | |
2814 | ||
2815 | /* resend call if it's a retryable error */ | |
2816 | if (rc == -EAGAIN) { | |
2817 | rc = cifs_retry_async_readv(rdata); | |
2818 | goto restart_loop; | |
1da177e4 | 2819 | } |
1da177e4 | 2820 | } |
1c892549 JL |
2821 | list_del_init(&rdata->list); |
2822 | kref_put(&rdata->refcount, cifs_uncached_readdata_release); | |
1da177e4 | 2823 | } |
a70307ee | 2824 | |
1c892549 JL |
2825 | cifs_stats_bytes_read(tcon, total_read); |
2826 | *poffset += total_read; | |
2827 | ||
09a4707e PS |
2828 | /* mask nodata case */ |
2829 | if (rc == -ENODATA) | |
2830 | rc = 0; | |
2831 | ||
1c892549 | 2832 | return total_read ? total_read : rc; |
1da177e4 LT |
2833 | } |
2834 | ||
0b81c1c4 | 2835 | ssize_t cifs_user_readv(struct kiocb *iocb, const struct iovec *iov, |
a70307ee PS |
2836 | unsigned long nr_segs, loff_t pos) |
2837 | { | |
2838 | ssize_t read; | |
2839 | ||
2840 | read = cifs_iovec_read(iocb->ki_filp, iov, nr_segs, &pos); | |
2841 | if (read > 0) | |
2842 | iocb->ki_pos = pos; | |
2843 | ||
2844 | return read; | |
2845 | } | |
2846 | ||
579f9053 PS |
2847 | ssize_t |
2848 | cifs_strict_readv(struct kiocb *iocb, const struct iovec *iov, | |
2849 | unsigned long nr_segs, loff_t pos) | |
a70307ee | 2850 | { |
579f9053 PS |
2851 | struct inode *inode = iocb->ki_filp->f_path.dentry->d_inode; |
2852 | struct cifsInodeInfo *cinode = CIFS_I(inode); | |
2853 | struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb); | |
2854 | struct cifsFileInfo *cfile = (struct cifsFileInfo *) | |
2855 | iocb->ki_filp->private_data; | |
2856 | struct cifs_tcon *tcon = tlink_tcon(cfile->tlink); | |
2857 | int rc = -EACCES; | |
a70307ee PS |
2858 | |
2859 | /* | |
2860 | * In strict cache mode we need to read from the server all the time | |
2861 | * if we don't have level II oplock because the server can delay mtime | |
2862 | * change - so we can't make a decision about inode invalidating. | |
2863 | * And we can also fail with pagereading if there are mandatory locks | |
2864 | * on pages affected by this read but not on the region from pos to | |
2865 | * pos+len-1. | |
2866 | */ | |
579f9053 PS |
2867 | if (!cinode->clientCanCacheRead) |
2868 | return cifs_user_readv(iocb, iov, nr_segs, pos); | |
a70307ee | 2869 | |
579f9053 PS |
2870 | if (cap_unix(tcon->ses) && |
2871 | (CIFS_UNIX_FCNTL_CAP & le64_to_cpu(tcon->fsUnixInfo.Capability)) && | |
2872 | ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NOPOSIXBRL) == 0)) | |
2873 | return generic_file_aio_read(iocb, iov, nr_segs, pos); | |
2874 | ||
2875 | /* | |
2876 | * We need to hold the sem to be sure nobody modifies lock list | |
2877 | * with a brlock that prevents reading. | |
2878 | */ | |
2879 | down_read(&cinode->lock_sem); | |
2880 | if (!cifs_find_lock_conflict(cfile, pos, iov_length(iov, nr_segs), | |
2881 | tcon->ses->server->vals->shared_lock_type, | |
2882 | NULL, true)) | |
2883 | rc = generic_file_aio_read(iocb, iov, nr_segs, pos); | |
2884 | up_read(&cinode->lock_sem); | |
2885 | return rc; | |
a70307ee | 2886 | } |
1da177e4 | 2887 | |
f9c6e234 PS |
2888 | static ssize_t |
2889 | cifs_read(struct file *file, char *read_data, size_t read_size, loff_t *offset) | |
1da177e4 LT |
2890 | { |
2891 | int rc = -EACCES; | |
2892 | unsigned int bytes_read = 0; | |
2893 | unsigned int total_read; | |
2894 | unsigned int current_read_size; | |
5eba8ab3 | 2895 | unsigned int rsize; |
1da177e4 | 2896 | struct cifs_sb_info *cifs_sb; |
29e20f9c | 2897 | struct cifs_tcon *tcon; |
f9c6e234 | 2898 | struct TCP_Server_Info *server; |
6d5786a3 | 2899 | unsigned int xid; |
f9c6e234 | 2900 | char *cur_offset; |
1da177e4 | 2901 | struct cifsFileInfo *open_file; |
d4ffff1f | 2902 | struct cifs_io_parms io_parms; |
ec637e3f | 2903 | int buf_type = CIFS_NO_BUFFER; |
d4ffff1f | 2904 | __u32 pid; |
1da177e4 | 2905 | |
6d5786a3 | 2906 | xid = get_xid(); |
e6a00296 | 2907 | cifs_sb = CIFS_SB(file->f_path.dentry->d_sb); |
1da177e4 | 2908 | |
5eba8ab3 JL |
2909 | /* FIXME: set up handlers for larger reads and/or convert to async */ |
2910 | rsize = min_t(unsigned int, cifs_sb->rsize, CIFSMaxBufSize); | |
2911 | ||
1da177e4 | 2912 | if (file->private_data == NULL) { |
0f3bc09e | 2913 | rc = -EBADF; |
6d5786a3 | 2914 | free_xid(xid); |
0f3bc09e | 2915 | return rc; |
1da177e4 | 2916 | } |
c21dfb69 | 2917 | open_file = file->private_data; |
29e20f9c | 2918 | tcon = tlink_tcon(open_file->tlink); |
f9c6e234 PS |
2919 | server = tcon->ses->server; |
2920 | ||
2921 | if (!server->ops->sync_read) { | |
2922 | free_xid(xid); | |
2923 | return -ENOSYS; | |
2924 | } | |
1da177e4 | 2925 | |
d4ffff1f PS |
2926 | if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_RWPIDFORWARD) |
2927 | pid = open_file->pid; | |
2928 | else | |
2929 | pid = current->tgid; | |
2930 | ||
1da177e4 | 2931 | if ((file->f_flags & O_ACCMODE) == O_WRONLY) |
b6b38f70 | 2932 | cFYI(1, "attempting read on write only file instance"); |
1da177e4 | 2933 | |
f9c6e234 PS |
2934 | for (total_read = 0, cur_offset = read_data; read_size > total_read; |
2935 | total_read += bytes_read, cur_offset += bytes_read) { | |
5eba8ab3 | 2936 | current_read_size = min_t(uint, read_size - total_read, rsize); |
29e20f9c PS |
2937 | /* |
2938 | * For windows me and 9x we do not want to request more than it | |
2939 | * negotiated since it will refuse the read then. | |
2940 | */ | |
2941 | if ((tcon->ses) && !(tcon->ses->capabilities & | |
2942 | tcon->ses->server->vals->cap_large_files)) { | |
7748dd6e | 2943 | current_read_size = min_t(uint, current_read_size, |
c974befa | 2944 | CIFSMaxBufSize); |
f9f5c817 | 2945 | } |
1da177e4 LT |
2946 | rc = -EAGAIN; |
2947 | while (rc == -EAGAIN) { | |
cdff08e7 | 2948 | if (open_file->invalidHandle) { |
15886177 | 2949 | rc = cifs_reopen_file(open_file, true); |
1da177e4 LT |
2950 | if (rc != 0) |
2951 | break; | |
2952 | } | |
d4ffff1f | 2953 | io_parms.pid = pid; |
29e20f9c | 2954 | io_parms.tcon = tcon; |
f9c6e234 | 2955 | io_parms.offset = *offset; |
d4ffff1f | 2956 | io_parms.length = current_read_size; |
f9c6e234 PS |
2957 | rc = server->ops->sync_read(xid, open_file, &io_parms, |
2958 | &bytes_read, &cur_offset, | |
2959 | &buf_type); | |
1da177e4 LT |
2960 | } |
2961 | if (rc || (bytes_read == 0)) { | |
2962 | if (total_read) { | |
2963 | break; | |
2964 | } else { | |
6d5786a3 | 2965 | free_xid(xid); |
1da177e4 LT |
2966 | return rc; |
2967 | } | |
2968 | } else { | |
29e20f9c | 2969 | cifs_stats_bytes_read(tcon, total_read); |
f9c6e234 | 2970 | *offset += bytes_read; |
1da177e4 LT |
2971 | } |
2972 | } | |
6d5786a3 | 2973 | free_xid(xid); |
1da177e4 LT |
2974 | return total_read; |
2975 | } | |
2976 | ||
ca83ce3d JL |
2977 | /* |
2978 | * If the page is mmap'ed into a process' page tables, then we need to make | |
2979 | * sure that it doesn't change while being written back. | |
2980 | */ | |
2981 | static int | |
2982 | cifs_page_mkwrite(struct vm_area_struct *vma, struct vm_fault *vmf) | |
2983 | { | |
2984 | struct page *page = vmf->page; | |
2985 | ||
2986 | lock_page(page); | |
2987 | return VM_FAULT_LOCKED; | |
2988 | } | |
2989 | ||
2990 | static struct vm_operations_struct cifs_file_vm_ops = { | |
2991 | .fault = filemap_fault, | |
2992 | .page_mkwrite = cifs_page_mkwrite, | |
0b173bc4 | 2993 | .remap_pages = generic_file_remap_pages, |
ca83ce3d JL |
2994 | }; |
2995 | ||
7a6a19b1 PS |
2996 | int cifs_file_strict_mmap(struct file *file, struct vm_area_struct *vma) |
2997 | { | |
2998 | int rc, xid; | |
2999 | struct inode *inode = file->f_path.dentry->d_inode; | |
3000 | ||
6d5786a3 | 3001 | xid = get_xid(); |
7a6a19b1 | 3002 | |
6feb9891 PS |
3003 | if (!CIFS_I(inode)->clientCanCacheRead) { |
3004 | rc = cifs_invalidate_mapping(inode); | |
3005 | if (rc) | |
3006 | return rc; | |
3007 | } | |
7a6a19b1 PS |
3008 | |
3009 | rc = generic_file_mmap(file, vma); | |
ca83ce3d JL |
3010 | if (rc == 0) |
3011 | vma->vm_ops = &cifs_file_vm_ops; | |
6d5786a3 | 3012 | free_xid(xid); |
7a6a19b1 PS |
3013 | return rc; |
3014 | } | |
3015 | ||
1da177e4 LT |
3016 | int cifs_file_mmap(struct file *file, struct vm_area_struct *vma) |
3017 | { | |
1da177e4 LT |
3018 | int rc, xid; |
3019 | ||
6d5786a3 | 3020 | xid = get_xid(); |
abab095d | 3021 | rc = cifs_revalidate_file(file); |
1da177e4 | 3022 | if (rc) { |
b6b38f70 | 3023 | cFYI(1, "Validation prior to mmap failed, error=%d", rc); |
6d5786a3 | 3024 | free_xid(xid); |
1da177e4 LT |
3025 | return rc; |
3026 | } | |
3027 | rc = generic_file_mmap(file, vma); | |
ca83ce3d JL |
3028 | if (rc == 0) |
3029 | vma->vm_ops = &cifs_file_vm_ops; | |
6d5786a3 | 3030 | free_xid(xid); |
1da177e4 LT |
3031 | return rc; |
3032 | } | |
3033 | ||
0471ca3f JL |
3034 | static void |
3035 | cifs_readv_complete(struct work_struct *work) | |
3036 | { | |
c5fab6f4 | 3037 | unsigned int i; |
0471ca3f JL |
3038 | struct cifs_readdata *rdata = container_of(work, |
3039 | struct cifs_readdata, work); | |
0471ca3f | 3040 | |
c5fab6f4 JL |
3041 | for (i = 0; i < rdata->nr_pages; i++) { |
3042 | struct page *page = rdata->pages[i]; | |
3043 | ||
0471ca3f JL |
3044 | lru_cache_add_file(page); |
3045 | ||
3046 | if (rdata->result == 0) { | |
0471ca3f JL |
3047 | flush_dcache_page(page); |
3048 | SetPageUptodate(page); | |
3049 | } | |
3050 | ||
3051 | unlock_page(page); | |
3052 | ||
3053 | if (rdata->result == 0) | |
3054 | cifs_readpage_to_fscache(rdata->mapping->host, page); | |
3055 | ||
3056 | page_cache_release(page); | |
c5fab6f4 | 3057 | rdata->pages[i] = NULL; |
0471ca3f | 3058 | } |
6993f74a | 3059 | kref_put(&rdata->refcount, cifs_readdata_release); |
0471ca3f JL |
3060 | } |
3061 | ||
8d5ce4d2 | 3062 | static int |
8321fec4 JL |
3063 | cifs_readpages_read_into_pages(struct TCP_Server_Info *server, |
3064 | struct cifs_readdata *rdata, unsigned int len) | |
8d5ce4d2 | 3065 | { |
8321fec4 | 3066 | int total_read = 0, result = 0; |
c5fab6f4 | 3067 | unsigned int i; |
8d5ce4d2 JL |
3068 | u64 eof; |
3069 | pgoff_t eof_index; | |
c5fab6f4 | 3070 | unsigned int nr_pages = rdata->nr_pages; |
8321fec4 | 3071 | struct kvec iov; |
8d5ce4d2 JL |
3072 | |
3073 | /* determine the eof that the server (probably) has */ | |
3074 | eof = CIFS_I(rdata->mapping->host)->server_eof; | |
3075 | eof_index = eof ? (eof - 1) >> PAGE_CACHE_SHIFT : 0; | |
3076 | cFYI(1, "eof=%llu eof_index=%lu", eof, eof_index); | |
3077 | ||
8321fec4 | 3078 | rdata->tailsz = PAGE_CACHE_SIZE; |
c5fab6f4 JL |
3079 | for (i = 0; i < nr_pages; i++) { |
3080 | struct page *page = rdata->pages[i]; | |
3081 | ||
8321fec4 | 3082 | if (len >= PAGE_CACHE_SIZE) { |
8d5ce4d2 | 3083 | /* enough data to fill the page */ |
8321fec4 JL |
3084 | iov.iov_base = kmap(page); |
3085 | iov.iov_len = PAGE_CACHE_SIZE; | |
8d5ce4d2 | 3086 | cFYI(1, "%u: idx=%lu iov_base=%p iov_len=%zu", |
8321fec4 JL |
3087 | i, page->index, iov.iov_base, iov.iov_len); |
3088 | len -= PAGE_CACHE_SIZE; | |
3089 | } else if (len > 0) { | |
8d5ce4d2 | 3090 | /* enough for partial page, fill and zero the rest */ |
8321fec4 JL |
3091 | iov.iov_base = kmap(page); |
3092 | iov.iov_len = len; | |
8d5ce4d2 | 3093 | cFYI(1, "%u: idx=%lu iov_base=%p iov_len=%zu", |
8321fec4 JL |
3094 | i, page->index, iov.iov_base, iov.iov_len); |
3095 | memset(iov.iov_base + len, | |
3096 | '\0', PAGE_CACHE_SIZE - len); | |
3097 | rdata->tailsz = len; | |
3098 | len = 0; | |
8d5ce4d2 JL |
3099 | } else if (page->index > eof_index) { |
3100 | /* | |
3101 | * The VFS will not try to do readahead past the | |
3102 | * i_size, but it's possible that we have outstanding | |
3103 | * writes with gaps in the middle and the i_size hasn't | |
3104 | * caught up yet. Populate those with zeroed out pages | |
3105 | * to prevent the VFS from repeatedly attempting to | |
3106 | * fill them until the writes are flushed. | |
3107 | */ | |
3108 | zero_user(page, 0, PAGE_CACHE_SIZE); | |
8d5ce4d2 JL |
3109 | lru_cache_add_file(page); |
3110 | flush_dcache_page(page); | |
3111 | SetPageUptodate(page); | |
3112 | unlock_page(page); | |
3113 | page_cache_release(page); | |
c5fab6f4 JL |
3114 | rdata->pages[i] = NULL; |
3115 | rdata->nr_pages--; | |
8321fec4 | 3116 | continue; |
8d5ce4d2 JL |
3117 | } else { |
3118 | /* no need to hold page hostage */ | |
8d5ce4d2 JL |
3119 | lru_cache_add_file(page); |
3120 | unlock_page(page); | |
3121 | page_cache_release(page); | |
c5fab6f4 JL |
3122 | rdata->pages[i] = NULL; |
3123 | rdata->nr_pages--; | |
8321fec4 | 3124 | continue; |
8d5ce4d2 | 3125 | } |
8321fec4 JL |
3126 | |
3127 | result = cifs_readv_from_socket(server, &iov, 1, iov.iov_len); | |
3128 | kunmap(page); | |
3129 | if (result < 0) | |
3130 | break; | |
3131 | ||
3132 | total_read += result; | |
8d5ce4d2 JL |
3133 | } |
3134 | ||
8321fec4 | 3135 | return total_read > 0 ? total_read : result; |
8d5ce4d2 JL |
3136 | } |
3137 | ||
1da177e4 LT |
3138 | static int cifs_readpages(struct file *file, struct address_space *mapping, |
3139 | struct list_head *page_list, unsigned num_pages) | |
3140 | { | |
690c5e31 JL |
3141 | int rc; |
3142 | struct list_head tmplist; | |
3143 | struct cifsFileInfo *open_file = file->private_data; | |
3144 | struct cifs_sb_info *cifs_sb = CIFS_SB(file->f_path.dentry->d_sb); | |
3145 | unsigned int rsize = cifs_sb->rsize; | |
3146 | pid_t pid; | |
1da177e4 | 3147 | |
690c5e31 JL |
3148 | /* |
3149 | * Give up immediately if rsize is too small to read an entire page. | |
3150 | * The VFS will fall back to readpage. We should never reach this | |
3151 | * point however since we set ra_pages to 0 when the rsize is smaller | |
3152 | * than a cache page. | |
3153 | */ | |
3154 | if (unlikely(rsize < PAGE_CACHE_SIZE)) | |
3155 | return 0; | |
bfa0d75a | 3156 | |
56698236 SJ |
3157 | /* |
3158 | * Reads as many pages as possible from fscache. Returns -ENOBUFS | |
3159 | * immediately if the cookie is negative | |
3160 | */ | |
3161 | rc = cifs_readpages_from_fscache(mapping->host, mapping, page_list, | |
3162 | &num_pages); | |
3163 | if (rc == 0) | |
690c5e31 | 3164 | return rc; |
56698236 | 3165 | |
d4ffff1f PS |
3166 | if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_RWPIDFORWARD) |
3167 | pid = open_file->pid; | |
3168 | else | |
3169 | pid = current->tgid; | |
3170 | ||
690c5e31 JL |
3171 | rc = 0; |
3172 | INIT_LIST_HEAD(&tmplist); | |
1da177e4 | 3173 | |
690c5e31 JL |
3174 | cFYI(1, "%s: file=%p mapping=%p num_pages=%u", __func__, file, |
3175 | mapping, num_pages); | |
3176 | ||
3177 | /* | |
3178 | * Start with the page at end of list and move it to private | |
3179 | * list. Do the same with any following pages until we hit | |
3180 | * the rsize limit, hit an index discontinuity, or run out of | |
3181 | * pages. Issue the async read and then start the loop again | |
3182 | * until the list is empty. | |
3183 | * | |
3184 | * Note that list order is important. The page_list is in | |
3185 | * the order of declining indexes. When we put the pages in | |
3186 | * the rdata->pages, then we want them in increasing order. | |
3187 | */ | |
3188 | while (!list_empty(page_list)) { | |
c5fab6f4 | 3189 | unsigned int i; |
690c5e31 JL |
3190 | unsigned int bytes = PAGE_CACHE_SIZE; |
3191 | unsigned int expected_index; | |
3192 | unsigned int nr_pages = 1; | |
3193 | loff_t offset; | |
3194 | struct page *page, *tpage; | |
3195 | struct cifs_readdata *rdata; | |
1da177e4 LT |
3196 | |
3197 | page = list_entry(page_list->prev, struct page, lru); | |
690c5e31 JL |
3198 | |
3199 | /* | |
3200 | * Lock the page and put it in the cache. Since no one else | |
3201 | * should have access to this page, we're safe to simply set | |
3202 | * PG_locked without checking it first. | |
3203 | */ | |
3204 | __set_page_locked(page); | |
3205 | rc = add_to_page_cache_locked(page, mapping, | |
3206 | page->index, GFP_KERNEL); | |
3207 | ||
3208 | /* give up if we can't stick it in the cache */ | |
3209 | if (rc) { | |
3210 | __clear_page_locked(page); | |
3211 | break; | |
3212 | } | |
3213 | ||
3214 | /* move first page to the tmplist */ | |
1da177e4 | 3215 | offset = (loff_t)page->index << PAGE_CACHE_SHIFT; |
690c5e31 | 3216 | list_move_tail(&page->lru, &tmplist); |
1da177e4 | 3217 | |
690c5e31 JL |
3218 | /* now try and add more pages onto the request */ |
3219 | expected_index = page->index + 1; | |
3220 | list_for_each_entry_safe_reverse(page, tpage, page_list, lru) { | |
3221 | /* discontinuity ? */ | |
3222 | if (page->index != expected_index) | |
fb8c4b14 | 3223 | break; |
690c5e31 JL |
3224 | |
3225 | /* would this page push the read over the rsize? */ | |
3226 | if (bytes + PAGE_CACHE_SIZE > rsize) | |
3227 | break; | |
3228 | ||
3229 | __set_page_locked(page); | |
3230 | if (add_to_page_cache_locked(page, mapping, | |
3231 | page->index, GFP_KERNEL)) { | |
3232 | __clear_page_locked(page); | |
3233 | break; | |
3234 | } | |
3235 | list_move_tail(&page->lru, &tmplist); | |
3236 | bytes += PAGE_CACHE_SIZE; | |
3237 | expected_index++; | |
3238 | nr_pages++; | |
1da177e4 | 3239 | } |
690c5e31 | 3240 | |
0471ca3f | 3241 | rdata = cifs_readdata_alloc(nr_pages, cifs_readv_complete); |
690c5e31 JL |
3242 | if (!rdata) { |
3243 | /* best to give up if we're out of mem */ | |
3244 | list_for_each_entry_safe(page, tpage, &tmplist, lru) { | |
3245 | list_del(&page->lru); | |
3246 | lru_cache_add_file(page); | |
3247 | unlock_page(page); | |
3248 | page_cache_release(page); | |
3249 | } | |
3250 | rc = -ENOMEM; | |
3251 | break; | |
3252 | } | |
3253 | ||
6993f74a | 3254 | rdata->cfile = cifsFileInfo_get(open_file); |
690c5e31 JL |
3255 | rdata->mapping = mapping; |
3256 | rdata->offset = offset; | |
3257 | rdata->bytes = bytes; | |
3258 | rdata->pid = pid; | |
8321fec4 JL |
3259 | rdata->pagesz = PAGE_CACHE_SIZE; |
3260 | rdata->read_into_pages = cifs_readpages_read_into_pages; | |
c5fab6f4 JL |
3261 | |
3262 | list_for_each_entry_safe(page, tpage, &tmplist, lru) { | |
3263 | list_del(&page->lru); | |
3264 | rdata->pages[rdata->nr_pages++] = page; | |
3265 | } | |
690c5e31 | 3266 | |
2a1bb138 | 3267 | rc = cifs_retry_async_readv(rdata); |
690c5e31 | 3268 | if (rc != 0) { |
c5fab6f4 JL |
3269 | for (i = 0; i < rdata->nr_pages; i++) { |
3270 | page = rdata->pages[i]; | |
690c5e31 JL |
3271 | lru_cache_add_file(page); |
3272 | unlock_page(page); | |
3273 | page_cache_release(page); | |
1da177e4 | 3274 | } |
6993f74a | 3275 | kref_put(&rdata->refcount, cifs_readdata_release); |
1da177e4 LT |
3276 | break; |
3277 | } | |
6993f74a JL |
3278 | |
3279 | kref_put(&rdata->refcount, cifs_readdata_release); | |
1da177e4 LT |
3280 | } |
3281 | ||
1da177e4 LT |
3282 | return rc; |
3283 | } | |
3284 | ||
3285 | static int cifs_readpage_worker(struct file *file, struct page *page, | |
3286 | loff_t *poffset) | |
3287 | { | |
3288 | char *read_data; | |
3289 | int rc; | |
3290 | ||
56698236 SJ |
3291 | /* Is the page cached? */ |
3292 | rc = cifs_readpage_from_fscache(file->f_path.dentry->d_inode, page); | |
3293 | if (rc == 0) | |
3294 | goto read_complete; | |
3295 | ||
1da177e4 LT |
3296 | page_cache_get(page); |
3297 | read_data = kmap(page); | |
3298 | /* for reads over a certain size could initiate async read ahead */ | |
fb8c4b14 | 3299 | |
1da177e4 | 3300 | rc = cifs_read(file, read_data, PAGE_CACHE_SIZE, poffset); |
fb8c4b14 | 3301 | |
1da177e4 LT |
3302 | if (rc < 0) |
3303 | goto io_error; | |
3304 | else | |
b6b38f70 | 3305 | cFYI(1, "Bytes read %d", rc); |
fb8c4b14 | 3306 | |
e6a00296 JJS |
3307 | file->f_path.dentry->d_inode->i_atime = |
3308 | current_fs_time(file->f_path.dentry->d_inode->i_sb); | |
fb8c4b14 | 3309 | |
1da177e4 LT |
3310 | if (PAGE_CACHE_SIZE > rc) |
3311 | memset(read_data + rc, 0, PAGE_CACHE_SIZE - rc); | |
3312 | ||
3313 | flush_dcache_page(page); | |
3314 | SetPageUptodate(page); | |
9dc06558 SJ |
3315 | |
3316 | /* send this page to the cache */ | |
3317 | cifs_readpage_to_fscache(file->f_path.dentry->d_inode, page); | |
3318 | ||
1da177e4 | 3319 | rc = 0; |
fb8c4b14 | 3320 | |
1da177e4 | 3321 | io_error: |
fb8c4b14 | 3322 | kunmap(page); |
1da177e4 | 3323 | page_cache_release(page); |
56698236 SJ |
3324 | |
3325 | read_complete: | |
1da177e4 LT |
3326 | return rc; |
3327 | } | |
3328 | ||
3329 | static int cifs_readpage(struct file *file, struct page *page) | |
3330 | { | |
3331 | loff_t offset = (loff_t)page->index << PAGE_CACHE_SHIFT; | |
3332 | int rc = -EACCES; | |
6d5786a3 | 3333 | unsigned int xid; |
1da177e4 | 3334 | |
6d5786a3 | 3335 | xid = get_xid(); |
1da177e4 LT |
3336 | |
3337 | if (file->private_data == NULL) { | |
0f3bc09e | 3338 | rc = -EBADF; |
6d5786a3 | 3339 | free_xid(xid); |
0f3bc09e | 3340 | return rc; |
1da177e4 LT |
3341 | } |
3342 | ||
ac3aa2f8 | 3343 | cFYI(1, "readpage %p at offset %d 0x%x", |
b6b38f70 | 3344 | page, (int)offset, (int)offset); |
1da177e4 LT |
3345 | |
3346 | rc = cifs_readpage_worker(file, page, &offset); | |
3347 | ||
3348 | unlock_page(page); | |
3349 | ||
6d5786a3 | 3350 | free_xid(xid); |
1da177e4 LT |
3351 | return rc; |
3352 | } | |
3353 | ||
a403a0a3 SF |
3354 | static int is_inode_writable(struct cifsInodeInfo *cifs_inode) |
3355 | { | |
3356 | struct cifsFileInfo *open_file; | |
3357 | ||
4477288a | 3358 | spin_lock(&cifs_file_list_lock); |
a403a0a3 | 3359 | list_for_each_entry(open_file, &cifs_inode->openFileList, flist) { |
2e396b83 | 3360 | if (OPEN_FMODE(open_file->f_flags) & FMODE_WRITE) { |
4477288a | 3361 | spin_unlock(&cifs_file_list_lock); |
a403a0a3 SF |
3362 | return 1; |
3363 | } | |
3364 | } | |
4477288a | 3365 | spin_unlock(&cifs_file_list_lock); |
a403a0a3 SF |
3366 | return 0; |
3367 | } | |
3368 | ||
1da177e4 LT |
3369 | /* We do not want to update the file size from server for inodes |
3370 | open for write - to avoid races with writepage extending | |
3371 | the file - in the future we could consider allowing | |
fb8c4b14 | 3372 | refreshing the inode only on increases in the file size |
1da177e4 LT |
3373 | but this is tricky to do without racing with writebehind |
3374 | page caching in the current Linux kernel design */ | |
4b18f2a9 | 3375 | bool is_size_safe_to_change(struct cifsInodeInfo *cifsInode, __u64 end_of_file) |
1da177e4 | 3376 | { |
a403a0a3 | 3377 | if (!cifsInode) |
4b18f2a9 | 3378 | return true; |
50c2f753 | 3379 | |
a403a0a3 SF |
3380 | if (is_inode_writable(cifsInode)) { |
3381 | /* This inode is open for write at least once */ | |
c32a0b68 SF |
3382 | struct cifs_sb_info *cifs_sb; |
3383 | ||
c32a0b68 | 3384 | cifs_sb = CIFS_SB(cifsInode->vfs_inode.i_sb); |
ad7a2926 | 3385 | if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DIRECT_IO) { |
fb8c4b14 | 3386 | /* since no page cache to corrupt on directio |
c32a0b68 | 3387 | we can change size safely */ |
4b18f2a9 | 3388 | return true; |
c32a0b68 SF |
3389 | } |
3390 | ||
fb8c4b14 | 3391 | if (i_size_read(&cifsInode->vfs_inode) < end_of_file) |
4b18f2a9 | 3392 | return true; |
7ba52631 | 3393 | |
4b18f2a9 | 3394 | return false; |
23e7dd7d | 3395 | } else |
4b18f2a9 | 3396 | return true; |
1da177e4 LT |
3397 | } |
3398 | ||
d9414774 NP |
3399 | static int cifs_write_begin(struct file *file, struct address_space *mapping, |
3400 | loff_t pos, unsigned len, unsigned flags, | |
3401 | struct page **pagep, void **fsdata) | |
1da177e4 | 3402 | { |
d9414774 NP |
3403 | pgoff_t index = pos >> PAGE_CACHE_SHIFT; |
3404 | loff_t offset = pos & (PAGE_CACHE_SIZE - 1); | |
a98ee8c1 JL |
3405 | loff_t page_start = pos & PAGE_MASK; |
3406 | loff_t i_size; | |
3407 | struct page *page; | |
3408 | int rc = 0; | |
d9414774 | 3409 | |
b6b38f70 | 3410 | cFYI(1, "write_begin from %lld len %d", (long long)pos, len); |
d9414774 | 3411 | |
54566b2c | 3412 | page = grab_cache_page_write_begin(mapping, index, flags); |
a98ee8c1 JL |
3413 | if (!page) { |
3414 | rc = -ENOMEM; | |
3415 | goto out; | |
3416 | } | |
8a236264 | 3417 | |
a98ee8c1 JL |
3418 | if (PageUptodate(page)) |
3419 | goto out; | |
8a236264 | 3420 | |
a98ee8c1 JL |
3421 | /* |
3422 | * If we write a full page it will be up to date, no need to read from | |
3423 | * the server. If the write is short, we'll end up doing a sync write | |
3424 | * instead. | |
3425 | */ | |
3426 | if (len == PAGE_CACHE_SIZE) | |
3427 | goto out; | |
8a236264 | 3428 | |
a98ee8c1 JL |
3429 | /* |
3430 | * optimize away the read when we have an oplock, and we're not | |
3431 | * expecting to use any of the data we'd be reading in. That | |
3432 | * is, when the page lies beyond the EOF, or straddles the EOF | |
3433 | * and the write will cover all of the existing data. | |
3434 | */ | |
3435 | if (CIFS_I(mapping->host)->clientCanCacheRead) { | |
3436 | i_size = i_size_read(mapping->host); | |
3437 | if (page_start >= i_size || | |
3438 | (offset == 0 && (pos + len) >= i_size)) { | |
3439 | zero_user_segments(page, 0, offset, | |
3440 | offset + len, | |
3441 | PAGE_CACHE_SIZE); | |
3442 | /* | |
3443 | * PageChecked means that the parts of the page | |
3444 | * to which we're not writing are considered up | |
3445 | * to date. Once the data is copied to the | |
3446 | * page, it can be set uptodate. | |
3447 | */ | |
3448 | SetPageChecked(page); | |
3449 | goto out; | |
3450 | } | |
3451 | } | |
d9414774 | 3452 | |
a98ee8c1 JL |
3453 | if ((file->f_flags & O_ACCMODE) != O_WRONLY) { |
3454 | /* | |
3455 | * might as well read a page, it is fast enough. If we get | |
3456 | * an error, we don't need to return it. cifs_write_end will | |
3457 | * do a sync write instead since PG_uptodate isn't set. | |
3458 | */ | |
3459 | cifs_readpage_worker(file, page, &page_start); | |
8a236264 SF |
3460 | } else { |
3461 | /* we could try using another file handle if there is one - | |
3462 | but how would we lock it to prevent close of that handle | |
3463 | racing with this read? In any case | |
d9414774 | 3464 | this will be written out by write_end so is fine */ |
1da177e4 | 3465 | } |
a98ee8c1 JL |
3466 | out: |
3467 | *pagep = page; | |
3468 | return rc; | |
1da177e4 LT |
3469 | } |
3470 | ||
85f2d6b4 SJ |
3471 | static int cifs_release_page(struct page *page, gfp_t gfp) |
3472 | { | |
3473 | if (PagePrivate(page)) | |
3474 | return 0; | |
3475 | ||
3476 | return cifs_fscache_release_page(page, gfp); | |
3477 | } | |
3478 | ||
3479 | static void cifs_invalidate_page(struct page *page, unsigned long offset) | |
3480 | { | |
3481 | struct cifsInodeInfo *cifsi = CIFS_I(page->mapping->host); | |
3482 | ||
3483 | if (offset == 0) | |
3484 | cifs_fscache_invalidate_page(page, &cifsi->vfs_inode); | |
3485 | } | |
3486 | ||
9ad1506b PS |
3487 | static int cifs_launder_page(struct page *page) |
3488 | { | |
3489 | int rc = 0; | |
3490 | loff_t range_start = page_offset(page); | |
3491 | loff_t range_end = range_start + (loff_t)(PAGE_CACHE_SIZE - 1); | |
3492 | struct writeback_control wbc = { | |
3493 | .sync_mode = WB_SYNC_ALL, | |
3494 | .nr_to_write = 0, | |
3495 | .range_start = range_start, | |
3496 | .range_end = range_end, | |
3497 | }; | |
3498 | ||
3499 | cFYI(1, "Launder page: %p", page); | |
3500 | ||
3501 | if (clear_page_dirty_for_io(page)) | |
3502 | rc = cifs_writepage_locked(page, &wbc); | |
3503 | ||
3504 | cifs_fscache_invalidate_page(page, page->mapping->host); | |
3505 | return rc; | |
3506 | } | |
3507 | ||
9b646972 | 3508 | void cifs_oplock_break(struct work_struct *work) |
3bc303c2 JL |
3509 | { |
3510 | struct cifsFileInfo *cfile = container_of(work, struct cifsFileInfo, | |
3511 | oplock_break); | |
a5e18bc3 | 3512 | struct inode *inode = cfile->dentry->d_inode; |
3bc303c2 | 3513 | struct cifsInodeInfo *cinode = CIFS_I(inode); |
95a3f2f3 | 3514 | struct cifs_tcon *tcon = tlink_tcon(cfile->tlink); |
eb4b756b | 3515 | int rc = 0; |
3bc303c2 JL |
3516 | |
3517 | if (inode && S_ISREG(inode->i_mode)) { | |
d54ff732 | 3518 | if (cinode->clientCanCacheRead) |
8737c930 | 3519 | break_lease(inode, O_RDONLY); |
d54ff732 | 3520 | else |
8737c930 | 3521 | break_lease(inode, O_WRONLY); |
3bc303c2 JL |
3522 | rc = filemap_fdatawrite(inode->i_mapping); |
3523 | if (cinode->clientCanCacheRead == 0) { | |
eb4b756b JL |
3524 | rc = filemap_fdatawait(inode->i_mapping); |
3525 | mapping_set_error(inode->i_mapping, rc); | |
3bc303c2 JL |
3526 | invalidate_remote_inode(inode); |
3527 | } | |
b6b38f70 | 3528 | cFYI(1, "Oplock flush inode %p rc %d", inode, rc); |
3bc303c2 JL |
3529 | } |
3530 | ||
85160e03 PS |
3531 | rc = cifs_push_locks(cfile); |
3532 | if (rc) | |
3533 | cERROR(1, "Push locks rc = %d", rc); | |
3534 | ||
3bc303c2 JL |
3535 | /* |
3536 | * releasing stale oplock after recent reconnect of smb session using | |
3537 | * a now incorrect file handle is not a data integrity issue but do | |
3538 | * not bother sending an oplock release if session to server still is | |
3539 | * disconnected since oplock already released by the server | |
3540 | */ | |
cdff08e7 | 3541 | if (!cfile->oplock_break_cancelled) { |
95a3f2f3 PS |
3542 | rc = tcon->ses->server->ops->oplock_response(tcon, &cfile->fid, |
3543 | cinode); | |
b6b38f70 | 3544 | cFYI(1, "Oplock release rc = %d", rc); |
3bc303c2 | 3545 | } |
3bc303c2 JL |
3546 | } |
3547 | ||
f5e54d6e | 3548 | const struct address_space_operations cifs_addr_ops = { |
1da177e4 LT |
3549 | .readpage = cifs_readpage, |
3550 | .readpages = cifs_readpages, | |
3551 | .writepage = cifs_writepage, | |
37c0eb46 | 3552 | .writepages = cifs_writepages, |
d9414774 NP |
3553 | .write_begin = cifs_write_begin, |
3554 | .write_end = cifs_write_end, | |
1da177e4 | 3555 | .set_page_dirty = __set_page_dirty_nobuffers, |
85f2d6b4 SJ |
3556 | .releasepage = cifs_release_page, |
3557 | .invalidatepage = cifs_invalidate_page, | |
9ad1506b | 3558 | .launder_page = cifs_launder_page, |
1da177e4 | 3559 | }; |
273d81d6 DK |
3560 | |
3561 | /* | |
3562 | * cifs_readpages requires the server to support a buffer large enough to | |
3563 | * contain the header plus one complete page of data. Otherwise, we need | |
3564 | * to leave cifs_readpages out of the address space operations. | |
3565 | */ | |
f5e54d6e | 3566 | const struct address_space_operations cifs_addr_ops_smallbuf = { |
273d81d6 DK |
3567 | .readpage = cifs_readpage, |
3568 | .writepage = cifs_writepage, | |
3569 | .writepages = cifs_writepages, | |
d9414774 NP |
3570 | .write_begin = cifs_write_begin, |
3571 | .write_end = cifs_write_end, | |
273d81d6 | 3572 | .set_page_dirty = __set_page_dirty_nobuffers, |
85f2d6b4 SJ |
3573 | .releasepage = cifs_release_page, |
3574 | .invalidatepage = cifs_invalidate_page, | |
9ad1506b | 3575 | .launder_page = cifs_launder_page, |
273d81d6 | 3576 | }; |