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Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * fs/cifs/file.c | |
3 | * | |
4 | * vfs operations that deal with files | |
fb8c4b14 | 5 | * |
f19159dc | 6 | * Copyright (C) International Business Machines Corp., 2002,2010 |
1da177e4 | 7 | * Author(s): Steve French (sfrench@us.ibm.com) |
7ee1af76 | 8 | * Jeremy Allison (jra@samba.org) |
1da177e4 LT |
9 | * |
10 | * This library is free software; you can redistribute it and/or modify | |
11 | * it under the terms of the GNU Lesser General Public License as published | |
12 | * by the Free Software Foundation; either version 2.1 of the License, or | |
13 | * (at your option) any later version. | |
14 | * | |
15 | * This library is distributed in the hope that it will be useful, | |
16 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
17 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See | |
18 | * the GNU Lesser General Public License for more details. | |
19 | * | |
20 | * You should have received a copy of the GNU Lesser General Public License | |
21 | * along with this library; if not, write to the Free Software | |
22 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA | |
23 | */ | |
24 | #include <linux/fs.h> | |
37c0eb46 | 25 | #include <linux/backing-dev.h> |
1da177e4 LT |
26 | #include <linux/stat.h> |
27 | #include <linux/fcntl.h> | |
28 | #include <linux/pagemap.h> | |
29 | #include <linux/pagevec.h> | |
37c0eb46 | 30 | #include <linux/writeback.h> |
6f88cc2e | 31 | #include <linux/task_io_accounting_ops.h> |
23e7dd7d | 32 | #include <linux/delay.h> |
3bc303c2 | 33 | #include <linux/mount.h> |
5a0e3ad6 | 34 | #include <linux/slab.h> |
690c5e31 | 35 | #include <linux/swap.h> |
1da177e4 LT |
36 | #include <asm/div64.h> |
37 | #include "cifsfs.h" | |
38 | #include "cifspdu.h" | |
39 | #include "cifsglob.h" | |
40 | #include "cifsproto.h" | |
41 | #include "cifs_unicode.h" | |
42 | #include "cifs_debug.h" | |
43 | #include "cifs_fs_sb.h" | |
9451a9a5 | 44 | #include "fscache.h" |
1da177e4 | 45 | |
1da177e4 LT |
46 | static inline int cifs_convert_flags(unsigned int flags) |
47 | { | |
48 | if ((flags & O_ACCMODE) == O_RDONLY) | |
49 | return GENERIC_READ; | |
50 | else if ((flags & O_ACCMODE) == O_WRONLY) | |
51 | return GENERIC_WRITE; | |
52 | else if ((flags & O_ACCMODE) == O_RDWR) { | |
53 | /* GENERIC_ALL is too much permission to request | |
54 | can cause unnecessary access denied on create */ | |
55 | /* return GENERIC_ALL; */ | |
56 | return (GENERIC_READ | GENERIC_WRITE); | |
57 | } | |
58 | ||
e10f7b55 JL |
59 | return (READ_CONTROL | FILE_WRITE_ATTRIBUTES | FILE_READ_ATTRIBUTES | |
60 | FILE_WRITE_EA | FILE_APPEND_DATA | FILE_WRITE_DATA | | |
61 | FILE_READ_DATA); | |
7fc8f4e9 | 62 | } |
e10f7b55 | 63 | |
608712fe | 64 | static u32 cifs_posix_convert_flags(unsigned int flags) |
7fc8f4e9 | 65 | { |
608712fe | 66 | u32 posix_flags = 0; |
e10f7b55 | 67 | |
7fc8f4e9 | 68 | if ((flags & O_ACCMODE) == O_RDONLY) |
608712fe | 69 | posix_flags = SMB_O_RDONLY; |
7fc8f4e9 | 70 | else if ((flags & O_ACCMODE) == O_WRONLY) |
608712fe JL |
71 | posix_flags = SMB_O_WRONLY; |
72 | else if ((flags & O_ACCMODE) == O_RDWR) | |
73 | posix_flags = SMB_O_RDWR; | |
74 | ||
75 | if (flags & O_CREAT) | |
76 | posix_flags |= SMB_O_CREAT; | |
77 | if (flags & O_EXCL) | |
78 | posix_flags |= SMB_O_EXCL; | |
79 | if (flags & O_TRUNC) | |
80 | posix_flags |= SMB_O_TRUNC; | |
81 | /* be safe and imply O_SYNC for O_DSYNC */ | |
6b2f3d1f | 82 | if (flags & O_DSYNC) |
608712fe | 83 | posix_flags |= SMB_O_SYNC; |
7fc8f4e9 | 84 | if (flags & O_DIRECTORY) |
608712fe | 85 | posix_flags |= SMB_O_DIRECTORY; |
7fc8f4e9 | 86 | if (flags & O_NOFOLLOW) |
608712fe | 87 | posix_flags |= SMB_O_NOFOLLOW; |
7fc8f4e9 | 88 | if (flags & O_DIRECT) |
608712fe | 89 | posix_flags |= SMB_O_DIRECT; |
7fc8f4e9 SF |
90 | |
91 | return posix_flags; | |
1da177e4 LT |
92 | } |
93 | ||
94 | static inline int cifs_get_disposition(unsigned int flags) | |
95 | { | |
96 | if ((flags & (O_CREAT | O_EXCL)) == (O_CREAT | O_EXCL)) | |
97 | return FILE_CREATE; | |
98 | else if ((flags & (O_CREAT | O_TRUNC)) == (O_CREAT | O_TRUNC)) | |
99 | return FILE_OVERWRITE_IF; | |
100 | else if ((flags & O_CREAT) == O_CREAT) | |
101 | return FILE_OPEN_IF; | |
55aa2e09 SF |
102 | else if ((flags & O_TRUNC) == O_TRUNC) |
103 | return FILE_OVERWRITE; | |
1da177e4 LT |
104 | else |
105 | return FILE_OPEN; | |
106 | } | |
107 | ||
608712fe JL |
108 | int cifs_posix_open(char *full_path, struct inode **pinode, |
109 | struct super_block *sb, int mode, unsigned int f_flags, | |
6d5786a3 | 110 | __u32 *poplock, __u16 *pnetfid, unsigned int xid) |
608712fe JL |
111 | { |
112 | int rc; | |
113 | FILE_UNIX_BASIC_INFO *presp_data; | |
114 | __u32 posix_flags = 0; | |
115 | struct cifs_sb_info *cifs_sb = CIFS_SB(sb); | |
116 | struct cifs_fattr fattr; | |
117 | struct tcon_link *tlink; | |
96daf2b0 | 118 | struct cifs_tcon *tcon; |
608712fe JL |
119 | |
120 | cFYI(1, "posix open %s", full_path); | |
121 | ||
122 | presp_data = kzalloc(sizeof(FILE_UNIX_BASIC_INFO), GFP_KERNEL); | |
123 | if (presp_data == NULL) | |
124 | return -ENOMEM; | |
125 | ||
126 | tlink = cifs_sb_tlink(cifs_sb); | |
127 | if (IS_ERR(tlink)) { | |
128 | rc = PTR_ERR(tlink); | |
129 | goto posix_open_ret; | |
130 | } | |
131 | ||
132 | tcon = tlink_tcon(tlink); | |
133 | mode &= ~current_umask(); | |
134 | ||
135 | posix_flags = cifs_posix_convert_flags(f_flags); | |
136 | rc = CIFSPOSIXCreate(xid, tcon, posix_flags, mode, pnetfid, presp_data, | |
137 | poplock, full_path, cifs_sb->local_nls, | |
138 | cifs_sb->mnt_cifs_flags & | |
139 | CIFS_MOUNT_MAP_SPECIAL_CHR); | |
140 | cifs_put_tlink(tlink); | |
141 | ||
142 | if (rc) | |
143 | goto posix_open_ret; | |
144 | ||
145 | if (presp_data->Type == cpu_to_le32(-1)) | |
146 | goto posix_open_ret; /* open ok, caller does qpathinfo */ | |
147 | ||
148 | if (!pinode) | |
149 | goto posix_open_ret; /* caller does not need info */ | |
150 | ||
151 | cifs_unix_basic_to_fattr(&fattr, presp_data, cifs_sb); | |
152 | ||
153 | /* get new inode and set it up */ | |
154 | if (*pinode == NULL) { | |
155 | cifs_fill_uniqueid(sb, &fattr); | |
156 | *pinode = cifs_iget(sb, &fattr); | |
157 | if (!*pinode) { | |
158 | rc = -ENOMEM; | |
159 | goto posix_open_ret; | |
160 | } | |
161 | } else { | |
162 | cifs_fattr_to_inode(*pinode, &fattr); | |
163 | } | |
164 | ||
165 | posix_open_ret: | |
166 | kfree(presp_data); | |
167 | return rc; | |
168 | } | |
169 | ||
eeb910a6 PS |
170 | static int |
171 | cifs_nt_open(char *full_path, struct inode *inode, struct cifs_sb_info *cifs_sb, | |
fb1214e4 PS |
172 | struct cifs_tcon *tcon, unsigned int f_flags, __u32 *oplock, |
173 | struct cifs_fid *fid, unsigned int xid) | |
eeb910a6 PS |
174 | { |
175 | int rc; | |
fb1214e4 | 176 | int desired_access; |
eeb910a6 | 177 | int disposition; |
3d3ea8e6 | 178 | int create_options = CREATE_NOT_DIR; |
eeb910a6 | 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 | ||
f152fd5f PS |
508 | static int cifs_push_posix_locks(struct cifsFileInfo *cfile); |
509 | ||
2ae78ba8 PS |
510 | /* |
511 | * Try to reacquire byte range locks that were released when session | |
f152fd5f | 512 | * to server was lost. |
2ae78ba8 | 513 | */ |
f152fd5f PS |
514 | static int |
515 | cifs_relock_file(struct cifsFileInfo *cfile) | |
1da177e4 | 516 | { |
f152fd5f PS |
517 | struct cifs_sb_info *cifs_sb = CIFS_SB(cfile->dentry->d_sb); |
518 | struct cifsInodeInfo *cinode = CIFS_I(cfile->dentry->d_inode); | |
519 | struct cifs_tcon *tcon = tlink_tcon(cfile->tlink); | |
1da177e4 LT |
520 | int rc = 0; |
521 | ||
f152fd5f PS |
522 | /* we are going to update can_cache_brlcks here - need a write access */ |
523 | down_write(&cinode->lock_sem); | |
524 | if (cinode->can_cache_brlcks) { | |
525 | /* can cache locks - no need to push them */ | |
526 | up_write(&cinode->lock_sem); | |
527 | return rc; | |
528 | } | |
529 | ||
530 | if (cap_unix(tcon->ses) && | |
531 | (CIFS_UNIX_FCNTL_CAP & le64_to_cpu(tcon->fsUnixInfo.Capability)) && | |
532 | ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NOPOSIXBRL) == 0)) | |
533 | rc = cifs_push_posix_locks(cfile); | |
534 | else | |
535 | rc = tcon->ses->server->ops->push_mand_locks(cfile); | |
1da177e4 | 536 | |
f152fd5f | 537 | up_write(&cinode->lock_sem); |
1da177e4 LT |
538 | return rc; |
539 | } | |
540 | ||
2ae78ba8 PS |
541 | static int |
542 | cifs_reopen_file(struct cifsFileInfo *cfile, bool can_flush) | |
1da177e4 LT |
543 | { |
544 | int rc = -EACCES; | |
6d5786a3 | 545 | unsigned int xid; |
590a3fe0 | 546 | __u32 oplock; |
1da177e4 | 547 | struct cifs_sb_info *cifs_sb; |
96daf2b0 | 548 | struct cifs_tcon *tcon; |
2ae78ba8 PS |
549 | struct TCP_Server_Info *server; |
550 | struct cifsInodeInfo *cinode; | |
fb8c4b14 | 551 | struct inode *inode; |
1da177e4 | 552 | char *full_path = NULL; |
2ae78ba8 | 553 | int desired_access; |
1da177e4 | 554 | int disposition = FILE_OPEN; |
3d3ea8e6 | 555 | int create_options = CREATE_NOT_DIR; |
2ae78ba8 | 556 | struct cifs_fid fid; |
1da177e4 | 557 | |
6d5786a3 | 558 | xid = get_xid(); |
2ae78ba8 PS |
559 | mutex_lock(&cfile->fh_mutex); |
560 | if (!cfile->invalidHandle) { | |
561 | mutex_unlock(&cfile->fh_mutex); | |
0f3bc09e | 562 | rc = 0; |
6d5786a3 | 563 | free_xid(xid); |
0f3bc09e | 564 | return rc; |
1da177e4 LT |
565 | } |
566 | ||
2ae78ba8 | 567 | inode = cfile->dentry->d_inode; |
1da177e4 | 568 | cifs_sb = CIFS_SB(inode->i_sb); |
2ae78ba8 PS |
569 | tcon = tlink_tcon(cfile->tlink); |
570 | server = tcon->ses->server; | |
571 | ||
572 | /* | |
573 | * Can not grab rename sem here because various ops, including those | |
574 | * that already have the rename sem can end up causing writepage to get | |
575 | * called and if the server was down that means we end up here, and we | |
576 | * can never tell if the caller already has the rename_sem. | |
577 | */ | |
578 | full_path = build_path_from_dentry(cfile->dentry); | |
1da177e4 | 579 | if (full_path == NULL) { |
3a9f462f | 580 | rc = -ENOMEM; |
2ae78ba8 | 581 | mutex_unlock(&cfile->fh_mutex); |
6d5786a3 | 582 | free_xid(xid); |
3a9f462f | 583 | return rc; |
1da177e4 LT |
584 | } |
585 | ||
2ae78ba8 PS |
586 | cFYI(1, "inode = 0x%p file flags 0x%x for %s", inode, cfile->f_flags, |
587 | full_path); | |
1da177e4 | 588 | |
10b9b98e | 589 | if (tcon->ses->server->oplocks) |
1da177e4 LT |
590 | oplock = REQ_OPLOCK; |
591 | else | |
4b18f2a9 | 592 | oplock = 0; |
1da177e4 | 593 | |
29e20f9c | 594 | if (tcon->unix_ext && cap_unix(tcon->ses) && |
7fc8f4e9 | 595 | (CIFS_UNIX_POSIX_PATH_OPS_CAP & |
29e20f9c | 596 | le64_to_cpu(tcon->fsUnixInfo.Capability))) { |
608712fe JL |
597 | /* |
598 | * O_CREAT, O_EXCL and O_TRUNC already had their effect on the | |
599 | * original open. Must mask them off for a reopen. | |
600 | */ | |
2ae78ba8 | 601 | unsigned int oflags = cfile->f_flags & |
15886177 | 602 | ~(O_CREAT | O_EXCL | O_TRUNC); |
608712fe | 603 | |
2422f676 | 604 | rc = cifs_posix_open(full_path, NULL, inode->i_sb, |
2ae78ba8 PS |
605 | cifs_sb->mnt_file_mode /* ignored */, |
606 | oflags, &oplock, &fid.netfid, xid); | |
7fc8f4e9 | 607 | if (rc == 0) { |
b6b38f70 | 608 | cFYI(1, "posix reopen succeeded"); |
7fc8f4e9 SF |
609 | goto reopen_success; |
610 | } | |
2ae78ba8 PS |
611 | /* |
612 | * fallthrough to retry open the old way on errors, especially | |
613 | * in the reconnect path it is important to retry hard | |
614 | */ | |
7fc8f4e9 SF |
615 | } |
616 | ||
2ae78ba8 | 617 | desired_access = cifs_convert_flags(cfile->f_flags); |
7fc8f4e9 | 618 | |
3d3ea8e6 SP |
619 | if (backup_cred(cifs_sb)) |
620 | create_options |= CREATE_OPEN_BACKUP_INTENT; | |
621 | ||
b8c32dbb PS |
622 | if (server->ops->get_lease_key) |
623 | server->ops->get_lease_key(inode, &fid); | |
624 | ||
2ae78ba8 PS |
625 | /* |
626 | * Can not refresh inode by passing in file_info buf to be returned by | |
627 | * CIFSSMBOpen and then calling get_inode_info with returned buf since | |
628 | * file might have write behind data that needs to be flushed and server | |
629 | * version of file size can be stale. If we knew for sure that inode was | |
630 | * not dirty locally we could do this. | |
631 | */ | |
632 | rc = server->ops->open(xid, tcon, full_path, disposition, | |
633 | desired_access, create_options, &fid, &oplock, | |
634 | NULL, cifs_sb); | |
1da177e4 | 635 | if (rc) { |
2ae78ba8 PS |
636 | mutex_unlock(&cfile->fh_mutex); |
637 | cFYI(1, "cifs_reopen returned 0x%x", rc); | |
b6b38f70 | 638 | cFYI(1, "oplock: %d", oplock); |
15886177 JL |
639 | goto reopen_error_exit; |
640 | } | |
641 | ||
7fc8f4e9 | 642 | reopen_success: |
2ae78ba8 PS |
643 | cfile->invalidHandle = false; |
644 | mutex_unlock(&cfile->fh_mutex); | |
645 | cinode = CIFS_I(inode); | |
15886177 JL |
646 | |
647 | if (can_flush) { | |
648 | rc = filemap_write_and_wait(inode->i_mapping); | |
eb4b756b | 649 | mapping_set_error(inode->i_mapping, rc); |
15886177 | 650 | |
15886177 | 651 | if (tcon->unix_ext) |
2ae78ba8 PS |
652 | rc = cifs_get_inode_info_unix(&inode, full_path, |
653 | inode->i_sb, xid); | |
15886177 | 654 | else |
2ae78ba8 PS |
655 | rc = cifs_get_inode_info(&inode, full_path, NULL, |
656 | inode->i_sb, xid, NULL); | |
657 | } | |
658 | /* | |
659 | * Else we are writing out data to server already and could deadlock if | |
660 | * we tried to flush data, and since we do not know if we have data that | |
661 | * would invalidate the current end of file on the server we can not go | |
662 | * to the server to get the new inode info. | |
663 | */ | |
664 | ||
665 | server->ops->set_fid(cfile, &fid, oplock); | |
666 | cifs_relock_file(cfile); | |
15886177 JL |
667 | |
668 | reopen_error_exit: | |
1da177e4 | 669 | kfree(full_path); |
6d5786a3 | 670 | free_xid(xid); |
1da177e4 LT |
671 | return rc; |
672 | } | |
673 | ||
674 | int cifs_close(struct inode *inode, struct file *file) | |
675 | { | |
77970693 JL |
676 | if (file->private_data != NULL) { |
677 | cifsFileInfo_put(file->private_data); | |
678 | file->private_data = NULL; | |
679 | } | |
7ee1af76 | 680 | |
cdff08e7 SF |
681 | /* return code from the ->release op is always ignored */ |
682 | return 0; | |
1da177e4 LT |
683 | } |
684 | ||
685 | int cifs_closedir(struct inode *inode, struct file *file) | |
686 | { | |
687 | int rc = 0; | |
6d5786a3 | 688 | unsigned int xid; |
4b4de76e | 689 | struct cifsFileInfo *cfile = file->private_data; |
92fc65a7 PS |
690 | struct cifs_tcon *tcon; |
691 | struct TCP_Server_Info *server; | |
692 | char *buf; | |
1da177e4 | 693 | |
b6b38f70 | 694 | cFYI(1, "Closedir inode = 0x%p", inode); |
1da177e4 | 695 | |
92fc65a7 PS |
696 | if (cfile == NULL) |
697 | return rc; | |
698 | ||
6d5786a3 | 699 | xid = get_xid(); |
92fc65a7 PS |
700 | tcon = tlink_tcon(cfile->tlink); |
701 | server = tcon->ses->server; | |
1da177e4 | 702 | |
92fc65a7 PS |
703 | cFYI(1, "Freeing private data in close dir"); |
704 | spin_lock(&cifs_file_list_lock); | |
705 | if (!cfile->srch_inf.endOfSearch && !cfile->invalidHandle) { | |
706 | cfile->invalidHandle = true; | |
707 | spin_unlock(&cifs_file_list_lock); | |
708 | if (server->ops->close_dir) | |
709 | rc = server->ops->close_dir(xid, tcon, &cfile->fid); | |
710 | else | |
711 | rc = -ENOSYS; | |
712 | cFYI(1, "Closing uncompleted readdir with rc %d", rc); | |
713 | /* not much we can do if it fails anyway, ignore rc */ | |
714 | rc = 0; | |
715 | } else | |
716 | spin_unlock(&cifs_file_list_lock); | |
717 | ||
718 | buf = cfile->srch_inf.ntwrk_buf_start; | |
719 | if (buf) { | |
720 | cFYI(1, "closedir free smb buf in srch struct"); | |
721 | cfile->srch_inf.ntwrk_buf_start = NULL; | |
722 | if (cfile->srch_inf.smallBuf) | |
723 | cifs_small_buf_release(buf); | |
724 | else | |
725 | cifs_buf_release(buf); | |
1da177e4 | 726 | } |
92fc65a7 PS |
727 | |
728 | cifs_put_tlink(cfile->tlink); | |
729 | kfree(file->private_data); | |
730 | file->private_data = NULL; | |
1da177e4 | 731 | /* BB can we lock the filestruct while this is going on? */ |
6d5786a3 | 732 | free_xid(xid); |
1da177e4 LT |
733 | return rc; |
734 | } | |
735 | ||
85160e03 | 736 | static struct cifsLockInfo * |
fbd35aca | 737 | cifs_lock_init(__u64 offset, __u64 length, __u8 type) |
7ee1af76 | 738 | { |
a88b4707 | 739 | struct cifsLockInfo *lock = |
fb8c4b14 | 740 | kmalloc(sizeof(struct cifsLockInfo), GFP_KERNEL); |
a88b4707 PS |
741 | if (!lock) |
742 | return lock; | |
743 | lock->offset = offset; | |
744 | lock->length = length; | |
745 | lock->type = type; | |
a88b4707 PS |
746 | lock->pid = current->tgid; |
747 | INIT_LIST_HEAD(&lock->blist); | |
748 | init_waitqueue_head(&lock->block_q); | |
749 | return lock; | |
85160e03 PS |
750 | } |
751 | ||
f7ba7fe6 | 752 | void |
85160e03 PS |
753 | cifs_del_lock_waiters(struct cifsLockInfo *lock) |
754 | { | |
755 | struct cifsLockInfo *li, *tmp; | |
756 | list_for_each_entry_safe(li, tmp, &lock->blist, blist) { | |
757 | list_del_init(&li->blist); | |
758 | wake_up(&li->block_q); | |
759 | } | |
760 | } | |
761 | ||
762 | static bool | |
f45d3416 PS |
763 | cifs_find_fid_lock_conflict(struct cifs_fid_locks *fdlocks, __u64 offset, |
764 | __u64 length, __u8 type, struct cifsFileInfo *cfile, | |
579f9053 | 765 | struct cifsLockInfo **conf_lock, bool rw_check) |
85160e03 | 766 | { |
fbd35aca | 767 | struct cifsLockInfo *li; |
f45d3416 | 768 | struct cifsFileInfo *cur_cfile = fdlocks->cfile; |
106dc538 | 769 | struct TCP_Server_Info *server = tlink_tcon(cfile->tlink)->ses->server; |
85160e03 | 770 | |
f45d3416 | 771 | list_for_each_entry(li, &fdlocks->locks, llist) { |
85160e03 PS |
772 | if (offset + length <= li->offset || |
773 | offset >= li->offset + li->length) | |
774 | continue; | |
579f9053 PS |
775 | if (rw_check && server->ops->compare_fids(cfile, cur_cfile) && |
776 | current->tgid == li->pid) | |
777 | continue; | |
f45d3416 PS |
778 | if ((type & server->vals->shared_lock_type) && |
779 | ((server->ops->compare_fids(cfile, cur_cfile) && | |
780 | current->tgid == li->pid) || type == li->type)) | |
85160e03 | 781 | continue; |
579f9053 PS |
782 | if (conf_lock) |
783 | *conf_lock = li; | |
f45d3416 | 784 | return true; |
85160e03 PS |
785 | } |
786 | return false; | |
787 | } | |
788 | ||
579f9053 | 789 | bool |
55157dfb | 790 | cifs_find_lock_conflict(struct cifsFileInfo *cfile, __u64 offset, __u64 length, |
579f9053 PS |
791 | __u8 type, struct cifsLockInfo **conf_lock, |
792 | bool rw_check) | |
161ebf9f | 793 | { |
fbd35aca | 794 | bool rc = false; |
f45d3416 | 795 | struct cifs_fid_locks *cur; |
55157dfb | 796 | struct cifsInodeInfo *cinode = CIFS_I(cfile->dentry->d_inode); |
fbd35aca | 797 | |
f45d3416 PS |
798 | list_for_each_entry(cur, &cinode->llist, llist) { |
799 | rc = cifs_find_fid_lock_conflict(cur, offset, length, type, | |
579f9053 | 800 | cfile, conf_lock, rw_check); |
fbd35aca PS |
801 | if (rc) |
802 | break; | |
803 | } | |
fbd35aca PS |
804 | |
805 | return rc; | |
161ebf9f PS |
806 | } |
807 | ||
9a5101c8 PS |
808 | /* |
809 | * Check if there is another lock that prevents us to set the lock (mandatory | |
810 | * style). If such a lock exists, update the flock structure with its | |
811 | * properties. Otherwise, set the flock type to F_UNLCK if we can cache brlocks | |
812 | * or leave it the same if we can't. Returns 0 if we don't need to request to | |
813 | * the server or 1 otherwise. | |
814 | */ | |
85160e03 | 815 | static int |
fbd35aca PS |
816 | cifs_lock_test(struct cifsFileInfo *cfile, __u64 offset, __u64 length, |
817 | __u8 type, struct file_lock *flock) | |
85160e03 PS |
818 | { |
819 | int rc = 0; | |
820 | struct cifsLockInfo *conf_lock; | |
fbd35aca | 821 | struct cifsInodeInfo *cinode = CIFS_I(cfile->dentry->d_inode); |
106dc538 | 822 | struct TCP_Server_Info *server = tlink_tcon(cfile->tlink)->ses->server; |
85160e03 PS |
823 | bool exist; |
824 | ||
1b4b55a1 | 825 | down_read(&cinode->lock_sem); |
85160e03 | 826 | |
55157dfb | 827 | exist = cifs_find_lock_conflict(cfile, offset, length, type, |
579f9053 | 828 | &conf_lock, false); |
85160e03 PS |
829 | if (exist) { |
830 | flock->fl_start = conf_lock->offset; | |
831 | flock->fl_end = conf_lock->offset + conf_lock->length - 1; | |
832 | flock->fl_pid = conf_lock->pid; | |
106dc538 | 833 | if (conf_lock->type & server->vals->shared_lock_type) |
85160e03 PS |
834 | flock->fl_type = F_RDLCK; |
835 | else | |
836 | flock->fl_type = F_WRLCK; | |
837 | } else if (!cinode->can_cache_brlcks) | |
838 | rc = 1; | |
839 | else | |
840 | flock->fl_type = F_UNLCK; | |
841 | ||
1b4b55a1 | 842 | up_read(&cinode->lock_sem); |
85160e03 PS |
843 | return rc; |
844 | } | |
845 | ||
161ebf9f | 846 | static void |
fbd35aca | 847 | cifs_lock_add(struct cifsFileInfo *cfile, struct cifsLockInfo *lock) |
85160e03 | 848 | { |
fbd35aca | 849 | struct cifsInodeInfo *cinode = CIFS_I(cfile->dentry->d_inode); |
1b4b55a1 | 850 | down_write(&cinode->lock_sem); |
f45d3416 | 851 | list_add_tail(&lock->llist, &cfile->llist->locks); |
1b4b55a1 | 852 | up_write(&cinode->lock_sem); |
7ee1af76 JA |
853 | } |
854 | ||
9a5101c8 PS |
855 | /* |
856 | * Set the byte-range lock (mandatory style). Returns: | |
857 | * 1) 0, if we set the lock and don't need to request to the server; | |
858 | * 2) 1, if no locks prevent us but we need to request to the server; | |
859 | * 3) -EACCESS, if there is a lock that prevents us and wait is false. | |
860 | */ | |
85160e03 | 861 | static int |
fbd35aca | 862 | cifs_lock_add_if(struct cifsFileInfo *cfile, struct cifsLockInfo *lock, |
161ebf9f | 863 | bool wait) |
85160e03 | 864 | { |
161ebf9f | 865 | struct cifsLockInfo *conf_lock; |
fbd35aca | 866 | struct cifsInodeInfo *cinode = CIFS_I(cfile->dentry->d_inode); |
85160e03 PS |
867 | bool exist; |
868 | int rc = 0; | |
869 | ||
85160e03 PS |
870 | try_again: |
871 | exist = false; | |
1b4b55a1 | 872 | down_write(&cinode->lock_sem); |
85160e03 | 873 | |
55157dfb | 874 | exist = cifs_find_lock_conflict(cfile, lock->offset, lock->length, |
579f9053 | 875 | lock->type, &conf_lock, false); |
85160e03 | 876 | if (!exist && cinode->can_cache_brlcks) { |
f45d3416 | 877 | list_add_tail(&lock->llist, &cfile->llist->locks); |
1b4b55a1 | 878 | up_write(&cinode->lock_sem); |
85160e03 PS |
879 | return rc; |
880 | } | |
881 | ||
882 | if (!exist) | |
883 | rc = 1; | |
884 | else if (!wait) | |
885 | rc = -EACCES; | |
886 | else { | |
887 | list_add_tail(&lock->blist, &conf_lock->blist); | |
1b4b55a1 | 888 | up_write(&cinode->lock_sem); |
85160e03 PS |
889 | rc = wait_event_interruptible(lock->block_q, |
890 | (lock->blist.prev == &lock->blist) && | |
891 | (lock->blist.next == &lock->blist)); | |
892 | if (!rc) | |
893 | goto try_again; | |
1b4b55a1 | 894 | down_write(&cinode->lock_sem); |
a88b4707 | 895 | list_del_init(&lock->blist); |
85160e03 PS |
896 | } |
897 | ||
1b4b55a1 | 898 | up_write(&cinode->lock_sem); |
85160e03 PS |
899 | return rc; |
900 | } | |
901 | ||
9a5101c8 PS |
902 | /* |
903 | * Check if there is another lock that prevents us to set the lock (posix | |
904 | * style). If such a lock exists, update the flock structure with its | |
905 | * properties. Otherwise, set the flock type to F_UNLCK if we can cache brlocks | |
906 | * or leave it the same if we can't. Returns 0 if we don't need to request to | |
907 | * the server or 1 otherwise. | |
908 | */ | |
85160e03 | 909 | static int |
4f6bcec9 PS |
910 | cifs_posix_lock_test(struct file *file, struct file_lock *flock) |
911 | { | |
912 | int rc = 0; | |
913 | struct cifsInodeInfo *cinode = CIFS_I(file->f_path.dentry->d_inode); | |
914 | unsigned char saved_type = flock->fl_type; | |
915 | ||
50792760 PS |
916 | if ((flock->fl_flags & FL_POSIX) == 0) |
917 | return 1; | |
918 | ||
1b4b55a1 | 919 | down_read(&cinode->lock_sem); |
4f6bcec9 PS |
920 | posix_test_lock(file, flock); |
921 | ||
922 | if (flock->fl_type == F_UNLCK && !cinode->can_cache_brlcks) { | |
923 | flock->fl_type = saved_type; | |
924 | rc = 1; | |
925 | } | |
926 | ||
1b4b55a1 | 927 | up_read(&cinode->lock_sem); |
4f6bcec9 PS |
928 | return rc; |
929 | } | |
930 | ||
9a5101c8 PS |
931 | /* |
932 | * Set the byte-range lock (posix style). Returns: | |
933 | * 1) 0, if we set the lock and don't need to request to the server; | |
934 | * 2) 1, if we need to request to the server; | |
935 | * 3) <0, if the error occurs while setting the lock. | |
936 | */ | |
4f6bcec9 PS |
937 | static int |
938 | cifs_posix_lock_set(struct file *file, struct file_lock *flock) | |
939 | { | |
940 | struct cifsInodeInfo *cinode = CIFS_I(file->f_path.dentry->d_inode); | |
50792760 PS |
941 | int rc = 1; |
942 | ||
943 | if ((flock->fl_flags & FL_POSIX) == 0) | |
944 | return rc; | |
4f6bcec9 | 945 | |
66189be7 | 946 | try_again: |
1b4b55a1 | 947 | down_write(&cinode->lock_sem); |
4f6bcec9 | 948 | if (!cinode->can_cache_brlcks) { |
1b4b55a1 | 949 | up_write(&cinode->lock_sem); |
50792760 | 950 | return rc; |
4f6bcec9 | 951 | } |
66189be7 PS |
952 | |
953 | rc = posix_lock_file(file, flock, NULL); | |
1b4b55a1 | 954 | up_write(&cinode->lock_sem); |
66189be7 PS |
955 | if (rc == FILE_LOCK_DEFERRED) { |
956 | rc = wait_event_interruptible(flock->fl_wait, !flock->fl_next); | |
957 | if (!rc) | |
958 | goto try_again; | |
959 | locks_delete_block(flock); | |
960 | } | |
9ebb389d | 961 | return rc; |
4f6bcec9 PS |
962 | } |
963 | ||
d39a4f71 | 964 | int |
4f6bcec9 | 965 | cifs_push_mandatory_locks(struct cifsFileInfo *cfile) |
85160e03 | 966 | { |
6d5786a3 PS |
967 | unsigned int xid; |
968 | int rc = 0, stored_rc; | |
85160e03 PS |
969 | struct cifsLockInfo *li, *tmp; |
970 | struct cifs_tcon *tcon; | |
0013fb4c | 971 | unsigned int num, max_num, max_buf; |
32b9aaf1 PS |
972 | LOCKING_ANDX_RANGE *buf, *cur; |
973 | int types[] = {LOCKING_ANDX_LARGE_FILES, | |
974 | LOCKING_ANDX_SHARED_LOCK | LOCKING_ANDX_LARGE_FILES}; | |
975 | int i; | |
85160e03 | 976 | |
6d5786a3 | 977 | xid = get_xid(); |
85160e03 PS |
978 | tcon = tlink_tcon(cfile->tlink); |
979 | ||
0013fb4c PS |
980 | /* |
981 | * Accessing maxBuf is racy with cifs_reconnect - need to store value | |
982 | * and check it for zero before using. | |
983 | */ | |
984 | max_buf = tcon->ses->server->maxBuf; | |
985 | if (!max_buf) { | |
6d5786a3 | 986 | free_xid(xid); |
0013fb4c PS |
987 | return -EINVAL; |
988 | } | |
989 | ||
990 | max_num = (max_buf - sizeof(struct smb_hdr)) / | |
991 | sizeof(LOCKING_ANDX_RANGE); | |
32b9aaf1 PS |
992 | buf = kzalloc(max_num * sizeof(LOCKING_ANDX_RANGE), GFP_KERNEL); |
993 | if (!buf) { | |
6d5786a3 | 994 | free_xid(xid); |
e2f2886a | 995 | return -ENOMEM; |
32b9aaf1 PS |
996 | } |
997 | ||
998 | for (i = 0; i < 2; i++) { | |
999 | cur = buf; | |
1000 | num = 0; | |
f45d3416 | 1001 | list_for_each_entry_safe(li, tmp, &cfile->llist->locks, llist) { |
32b9aaf1 PS |
1002 | if (li->type != types[i]) |
1003 | continue; | |
1004 | cur->Pid = cpu_to_le16(li->pid); | |
1005 | cur->LengthLow = cpu_to_le32((u32)li->length); | |
1006 | cur->LengthHigh = cpu_to_le32((u32)(li->length>>32)); | |
1007 | cur->OffsetLow = cpu_to_le32((u32)li->offset); | |
1008 | cur->OffsetHigh = cpu_to_le32((u32)(li->offset>>32)); | |
1009 | if (++num == max_num) { | |
4b4de76e PS |
1010 | stored_rc = cifs_lockv(xid, tcon, |
1011 | cfile->fid.netfid, | |
04a6aa8a PS |
1012 | (__u8)li->type, 0, num, |
1013 | buf); | |
32b9aaf1 PS |
1014 | if (stored_rc) |
1015 | rc = stored_rc; | |
1016 | cur = buf; | |
1017 | num = 0; | |
1018 | } else | |
1019 | cur++; | |
1020 | } | |
1021 | ||
1022 | if (num) { | |
4b4de76e | 1023 | stored_rc = cifs_lockv(xid, tcon, cfile->fid.netfid, |
04a6aa8a | 1024 | (__u8)types[i], 0, num, buf); |
32b9aaf1 PS |
1025 | if (stored_rc) |
1026 | rc = stored_rc; | |
1027 | } | |
85160e03 PS |
1028 | } |
1029 | ||
32b9aaf1 | 1030 | kfree(buf); |
6d5786a3 | 1031 | free_xid(xid); |
85160e03 PS |
1032 | return rc; |
1033 | } | |
1034 | ||
4f6bcec9 PS |
1035 | /* copied from fs/locks.c with a name change */ |
1036 | #define cifs_for_each_lock(inode, lockp) \ | |
1037 | for (lockp = &inode->i_flock; *lockp != NULL; \ | |
1038 | lockp = &(*lockp)->fl_next) | |
1039 | ||
d5751469 PS |
1040 | struct lock_to_push { |
1041 | struct list_head llist; | |
1042 | __u64 offset; | |
1043 | __u64 length; | |
1044 | __u32 pid; | |
1045 | __u16 netfid; | |
1046 | __u8 type; | |
1047 | }; | |
1048 | ||
4f6bcec9 | 1049 | static int |
b8db928b | 1050 | cifs_push_posix_locks(struct cifsFileInfo *cfile) |
4f6bcec9 | 1051 | { |
4f6bcec9 PS |
1052 | struct cifs_tcon *tcon = tlink_tcon(cfile->tlink); |
1053 | struct file_lock *flock, **before; | |
d5751469 | 1054 | unsigned int count = 0, i = 0; |
4f6bcec9 | 1055 | int rc = 0, xid, type; |
d5751469 PS |
1056 | struct list_head locks_to_send, *el; |
1057 | struct lock_to_push *lck, *tmp; | |
4f6bcec9 | 1058 | __u64 length; |
4f6bcec9 | 1059 | |
6d5786a3 | 1060 | xid = get_xid(); |
4f6bcec9 | 1061 | |
d5751469 PS |
1062 | lock_flocks(); |
1063 | cifs_for_each_lock(cfile->dentry->d_inode, before) { | |
1064 | if ((*before)->fl_flags & FL_POSIX) | |
1065 | count++; | |
1066 | } | |
1067 | unlock_flocks(); | |
1068 | ||
4f6bcec9 PS |
1069 | INIT_LIST_HEAD(&locks_to_send); |
1070 | ||
d5751469 | 1071 | /* |
ce85852b | 1072 | * Allocating count locks is enough because no FL_POSIX locks can be |
1b4b55a1 | 1073 | * added to the list while we are holding cinode->lock_sem that |
ce85852b | 1074 | * protects locking operations of this inode. |
d5751469 PS |
1075 | */ |
1076 | for (; i < count; i++) { | |
1077 | lck = kmalloc(sizeof(struct lock_to_push), GFP_KERNEL); | |
1078 | if (!lck) { | |
1079 | rc = -ENOMEM; | |
1080 | goto err_out; | |
1081 | } | |
1082 | list_add_tail(&lck->llist, &locks_to_send); | |
1083 | } | |
1084 | ||
d5751469 | 1085 | el = locks_to_send.next; |
4f6bcec9 PS |
1086 | lock_flocks(); |
1087 | cifs_for_each_lock(cfile->dentry->d_inode, before) { | |
ce85852b PS |
1088 | flock = *before; |
1089 | if ((flock->fl_flags & FL_POSIX) == 0) | |
1090 | continue; | |
d5751469 | 1091 | if (el == &locks_to_send) { |
ce85852b PS |
1092 | /* |
1093 | * The list ended. We don't have enough allocated | |
1094 | * structures - something is really wrong. | |
1095 | */ | |
d5751469 PS |
1096 | cERROR(1, "Can't push all brlocks!"); |
1097 | break; | |
1098 | } | |
4f6bcec9 PS |
1099 | length = 1 + flock->fl_end - flock->fl_start; |
1100 | if (flock->fl_type == F_RDLCK || flock->fl_type == F_SHLCK) | |
1101 | type = CIFS_RDLCK; | |
1102 | else | |
1103 | type = CIFS_WRLCK; | |
d5751469 | 1104 | lck = list_entry(el, struct lock_to_push, llist); |
4f6bcec9 | 1105 | lck->pid = flock->fl_pid; |
4b4de76e | 1106 | lck->netfid = cfile->fid.netfid; |
d5751469 PS |
1107 | lck->length = length; |
1108 | lck->type = type; | |
1109 | lck->offset = flock->fl_start; | |
d5751469 | 1110 | el = el->next; |
4f6bcec9 | 1111 | } |
4f6bcec9 PS |
1112 | unlock_flocks(); |
1113 | ||
1114 | list_for_each_entry_safe(lck, tmp, &locks_to_send, llist) { | |
4f6bcec9 PS |
1115 | int stored_rc; |
1116 | ||
4f6bcec9 | 1117 | stored_rc = CIFSSMBPosixLock(xid, tcon, lck->netfid, lck->pid, |
c5fd363d | 1118 | lck->offset, lck->length, NULL, |
4f6bcec9 PS |
1119 | lck->type, 0); |
1120 | if (stored_rc) | |
1121 | rc = stored_rc; | |
1122 | list_del(&lck->llist); | |
1123 | kfree(lck); | |
1124 | } | |
1125 | ||
d5751469 | 1126 | out: |
6d5786a3 | 1127 | free_xid(xid); |
4f6bcec9 | 1128 | return rc; |
d5751469 PS |
1129 | err_out: |
1130 | list_for_each_entry_safe(lck, tmp, &locks_to_send, llist) { | |
1131 | list_del(&lck->llist); | |
1132 | kfree(lck); | |
1133 | } | |
1134 | goto out; | |
4f6bcec9 PS |
1135 | } |
1136 | ||
9ec3c882 | 1137 | static int |
b8db928b | 1138 | cifs_push_locks(struct cifsFileInfo *cfile) |
9ec3c882 | 1139 | { |
b8db928b | 1140 | struct cifs_sb_info *cifs_sb = CIFS_SB(cfile->dentry->d_sb); |
9ec3c882 | 1141 | struct cifsInodeInfo *cinode = CIFS_I(cfile->dentry->d_inode); |
b8db928b | 1142 | struct cifs_tcon *tcon = tlink_tcon(cfile->tlink); |
9ec3c882 PS |
1143 | int rc = 0; |
1144 | ||
1145 | /* we are going to update can_cache_brlcks here - need a write access */ | |
1146 | down_write(&cinode->lock_sem); | |
1147 | if (!cinode->can_cache_brlcks) { | |
1148 | up_write(&cinode->lock_sem); | |
1149 | return rc; | |
1150 | } | |
4f6bcec9 | 1151 | |
29e20f9c | 1152 | if (cap_unix(tcon->ses) && |
4f6bcec9 PS |
1153 | (CIFS_UNIX_FCNTL_CAP & le64_to_cpu(tcon->fsUnixInfo.Capability)) && |
1154 | ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NOPOSIXBRL) == 0)) | |
b8db928b PS |
1155 | rc = cifs_push_posix_locks(cfile); |
1156 | else | |
1157 | rc = tcon->ses->server->ops->push_mand_locks(cfile); | |
4f6bcec9 | 1158 | |
b8db928b PS |
1159 | cinode->can_cache_brlcks = false; |
1160 | up_write(&cinode->lock_sem); | |
1161 | return rc; | |
4f6bcec9 PS |
1162 | } |
1163 | ||
03776f45 | 1164 | static void |
04a6aa8a | 1165 | cifs_read_flock(struct file_lock *flock, __u32 *type, int *lock, int *unlock, |
106dc538 | 1166 | bool *wait_flag, struct TCP_Server_Info *server) |
1da177e4 | 1167 | { |
03776f45 | 1168 | if (flock->fl_flags & FL_POSIX) |
b6b38f70 | 1169 | cFYI(1, "Posix"); |
03776f45 | 1170 | if (flock->fl_flags & FL_FLOCK) |
b6b38f70 | 1171 | cFYI(1, "Flock"); |
03776f45 | 1172 | if (flock->fl_flags & FL_SLEEP) { |
b6b38f70 | 1173 | cFYI(1, "Blocking lock"); |
03776f45 | 1174 | *wait_flag = true; |
1da177e4 | 1175 | } |
03776f45 | 1176 | if (flock->fl_flags & FL_ACCESS) |
b6b38f70 | 1177 | cFYI(1, "Process suspended by mandatory locking - " |
03776f45 PS |
1178 | "not implemented yet"); |
1179 | if (flock->fl_flags & FL_LEASE) | |
b6b38f70 | 1180 | cFYI(1, "Lease on file - not implemented yet"); |
03776f45 | 1181 | if (flock->fl_flags & |
3d6d854a JL |
1182 | (~(FL_POSIX | FL_FLOCK | FL_SLEEP | |
1183 | FL_ACCESS | FL_LEASE | FL_CLOSE))) | |
03776f45 | 1184 | cFYI(1, "Unknown lock flags 0x%x", flock->fl_flags); |
1da177e4 | 1185 | |
106dc538 | 1186 | *type = server->vals->large_lock_type; |
03776f45 | 1187 | if (flock->fl_type == F_WRLCK) { |
b6b38f70 | 1188 | cFYI(1, "F_WRLCK "); |
106dc538 | 1189 | *type |= server->vals->exclusive_lock_type; |
03776f45 PS |
1190 | *lock = 1; |
1191 | } else if (flock->fl_type == F_UNLCK) { | |
b6b38f70 | 1192 | cFYI(1, "F_UNLCK"); |
106dc538 | 1193 | *type |= server->vals->unlock_lock_type; |
03776f45 PS |
1194 | *unlock = 1; |
1195 | /* Check if unlock includes more than one lock range */ | |
1196 | } else if (flock->fl_type == F_RDLCK) { | |
b6b38f70 | 1197 | cFYI(1, "F_RDLCK"); |
106dc538 | 1198 | *type |= server->vals->shared_lock_type; |
03776f45 PS |
1199 | *lock = 1; |
1200 | } else if (flock->fl_type == F_EXLCK) { | |
b6b38f70 | 1201 | cFYI(1, "F_EXLCK"); |
106dc538 | 1202 | *type |= server->vals->exclusive_lock_type; |
03776f45 PS |
1203 | *lock = 1; |
1204 | } else if (flock->fl_type == F_SHLCK) { | |
b6b38f70 | 1205 | cFYI(1, "F_SHLCK"); |
106dc538 | 1206 | *type |= server->vals->shared_lock_type; |
03776f45 | 1207 | *lock = 1; |
1da177e4 | 1208 | } else |
b6b38f70 | 1209 | cFYI(1, "Unknown type of lock"); |
03776f45 | 1210 | } |
1da177e4 | 1211 | |
03776f45 | 1212 | static int |
04a6aa8a | 1213 | cifs_getlk(struct file *file, struct file_lock *flock, __u32 type, |
6d5786a3 | 1214 | bool wait_flag, bool posix_lck, unsigned int xid) |
03776f45 PS |
1215 | { |
1216 | int rc = 0; | |
1217 | __u64 length = 1 + flock->fl_end - flock->fl_start; | |
4f6bcec9 PS |
1218 | struct cifsFileInfo *cfile = (struct cifsFileInfo *)file->private_data; |
1219 | struct cifs_tcon *tcon = tlink_tcon(cfile->tlink); | |
106dc538 | 1220 | struct TCP_Server_Info *server = tcon->ses->server; |
4b4de76e | 1221 | __u16 netfid = cfile->fid.netfid; |
f05337c6 | 1222 | |
03776f45 PS |
1223 | if (posix_lck) { |
1224 | int posix_lock_type; | |
4f6bcec9 PS |
1225 | |
1226 | rc = cifs_posix_lock_test(file, flock); | |
1227 | if (!rc) | |
1228 | return rc; | |
1229 | ||
106dc538 | 1230 | if (type & server->vals->shared_lock_type) |
03776f45 PS |
1231 | posix_lock_type = CIFS_RDLCK; |
1232 | else | |
1233 | posix_lock_type = CIFS_WRLCK; | |
4f6bcec9 | 1234 | rc = CIFSSMBPosixLock(xid, tcon, netfid, current->tgid, |
c5fd363d | 1235 | flock->fl_start, length, flock, |
4f6bcec9 | 1236 | posix_lock_type, wait_flag); |
03776f45 PS |
1237 | return rc; |
1238 | } | |
1da177e4 | 1239 | |
fbd35aca | 1240 | rc = cifs_lock_test(cfile, flock->fl_start, length, type, flock); |
85160e03 PS |
1241 | if (!rc) |
1242 | return rc; | |
1243 | ||
03776f45 | 1244 | /* BB we could chain these into one lock request BB */ |
d39a4f71 PS |
1245 | rc = server->ops->mand_lock(xid, cfile, flock->fl_start, length, 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, 0, 1, false); | |
03776f45 PS |
1250 | flock->fl_type = F_UNLCK; |
1251 | if (rc != 0) | |
1252 | cERROR(1, "Error unlocking previously locked " | |
106dc538 | 1253 | "range %d during test of lock", rc); |
a88b4707 | 1254 | return 0; |
1da177e4 | 1255 | } |
7ee1af76 | 1256 | |
106dc538 | 1257 | if (type & server->vals->shared_lock_type) { |
03776f45 | 1258 | flock->fl_type = F_WRLCK; |
a88b4707 | 1259 | return 0; |
7ee1af76 JA |
1260 | } |
1261 | ||
d39a4f71 PS |
1262 | type &= ~server->vals->exclusive_lock_type; |
1263 | ||
1264 | rc = server->ops->mand_lock(xid, cfile, flock->fl_start, length, | |
1265 | type | server->vals->shared_lock_type, | |
1266 | 1, 0, false); | |
03776f45 | 1267 | if (rc == 0) { |
d39a4f71 PS |
1268 | rc = server->ops->mand_lock(xid, cfile, flock->fl_start, length, |
1269 | type | server->vals->shared_lock_type, 0, 1, false); | |
03776f45 PS |
1270 | flock->fl_type = F_RDLCK; |
1271 | if (rc != 0) | |
1272 | cERROR(1, "Error unlocking previously locked " | |
1273 | "range %d during test of lock", rc); | |
1274 | } else | |
1275 | flock->fl_type = F_WRLCK; | |
1276 | ||
a88b4707 | 1277 | return 0; |
03776f45 PS |
1278 | } |
1279 | ||
f7ba7fe6 | 1280 | void |
9ee305b7 PS |
1281 | cifs_move_llist(struct list_head *source, struct list_head *dest) |
1282 | { | |
1283 | struct list_head *li, *tmp; | |
1284 | list_for_each_safe(li, tmp, source) | |
1285 | list_move(li, dest); | |
1286 | } | |
1287 | ||
f7ba7fe6 | 1288 | void |
9ee305b7 PS |
1289 | cifs_free_llist(struct list_head *llist) |
1290 | { | |
1291 | struct cifsLockInfo *li, *tmp; | |
1292 | list_for_each_entry_safe(li, tmp, llist, llist) { | |
1293 | cifs_del_lock_waiters(li); | |
1294 | list_del(&li->llist); | |
1295 | kfree(li); | |
1296 | } | |
1297 | } | |
1298 | ||
d39a4f71 | 1299 | int |
6d5786a3 PS |
1300 | cifs_unlock_range(struct cifsFileInfo *cfile, struct file_lock *flock, |
1301 | unsigned int xid) | |
9ee305b7 PS |
1302 | { |
1303 | int rc = 0, stored_rc; | |
1304 | int types[] = {LOCKING_ANDX_LARGE_FILES, | |
1305 | LOCKING_ANDX_SHARED_LOCK | LOCKING_ANDX_LARGE_FILES}; | |
1306 | unsigned int i; | |
0013fb4c | 1307 | unsigned int max_num, num, max_buf; |
9ee305b7 PS |
1308 | LOCKING_ANDX_RANGE *buf, *cur; |
1309 | struct cifs_tcon *tcon = tlink_tcon(cfile->tlink); | |
1310 | struct cifsInodeInfo *cinode = CIFS_I(cfile->dentry->d_inode); | |
1311 | struct cifsLockInfo *li, *tmp; | |
1312 | __u64 length = 1 + flock->fl_end - flock->fl_start; | |
1313 | struct list_head tmp_llist; | |
1314 | ||
1315 | INIT_LIST_HEAD(&tmp_llist); | |
1316 | ||
0013fb4c PS |
1317 | /* |
1318 | * Accessing maxBuf is racy with cifs_reconnect - need to store value | |
1319 | * and check it for zero before using. | |
1320 | */ | |
1321 | max_buf = tcon->ses->server->maxBuf; | |
1322 | if (!max_buf) | |
1323 | return -EINVAL; | |
1324 | ||
1325 | max_num = (max_buf - sizeof(struct smb_hdr)) / | |
1326 | sizeof(LOCKING_ANDX_RANGE); | |
9ee305b7 PS |
1327 | buf = kzalloc(max_num * sizeof(LOCKING_ANDX_RANGE), GFP_KERNEL); |
1328 | if (!buf) | |
1329 | return -ENOMEM; | |
1330 | ||
1b4b55a1 | 1331 | down_write(&cinode->lock_sem); |
9ee305b7 PS |
1332 | for (i = 0; i < 2; i++) { |
1333 | cur = buf; | |
1334 | num = 0; | |
f45d3416 | 1335 | list_for_each_entry_safe(li, tmp, &cfile->llist->locks, llist) { |
9ee305b7 PS |
1336 | if (flock->fl_start > li->offset || |
1337 | (flock->fl_start + length) < | |
1338 | (li->offset + li->length)) | |
1339 | continue; | |
1340 | if (current->tgid != li->pid) | |
1341 | continue; | |
9ee305b7 PS |
1342 | if (types[i] != li->type) |
1343 | continue; | |
ea319d57 | 1344 | if (cinode->can_cache_brlcks) { |
9ee305b7 PS |
1345 | /* |
1346 | * We can cache brlock requests - simply remove | |
fbd35aca | 1347 | * a lock from the file's list. |
9ee305b7 PS |
1348 | */ |
1349 | list_del(&li->llist); | |
1350 | cifs_del_lock_waiters(li); | |
1351 | kfree(li); | |
ea319d57 | 1352 | continue; |
9ee305b7 | 1353 | } |
ea319d57 PS |
1354 | cur->Pid = cpu_to_le16(li->pid); |
1355 | cur->LengthLow = cpu_to_le32((u32)li->length); | |
1356 | cur->LengthHigh = cpu_to_le32((u32)(li->length>>32)); | |
1357 | cur->OffsetLow = cpu_to_le32((u32)li->offset); | |
1358 | cur->OffsetHigh = cpu_to_le32((u32)(li->offset>>32)); | |
1359 | /* | |
1360 | * We need to save a lock here to let us add it again to | |
1361 | * the file's list if the unlock range request fails on | |
1362 | * the server. | |
1363 | */ | |
1364 | list_move(&li->llist, &tmp_llist); | |
1365 | if (++num == max_num) { | |
4b4de76e PS |
1366 | stored_rc = cifs_lockv(xid, tcon, |
1367 | cfile->fid.netfid, | |
ea319d57 PS |
1368 | li->type, num, 0, buf); |
1369 | if (stored_rc) { | |
1370 | /* | |
1371 | * We failed on the unlock range | |
1372 | * request - add all locks from the tmp | |
1373 | * list to the head of the file's list. | |
1374 | */ | |
1375 | cifs_move_llist(&tmp_llist, | |
f45d3416 | 1376 | &cfile->llist->locks); |
ea319d57 PS |
1377 | rc = stored_rc; |
1378 | } else | |
1379 | /* | |
1380 | * The unlock range request succeed - | |
1381 | * free the tmp list. | |
1382 | */ | |
1383 | cifs_free_llist(&tmp_llist); | |
1384 | cur = buf; | |
1385 | num = 0; | |
1386 | } else | |
1387 | cur++; | |
9ee305b7 PS |
1388 | } |
1389 | if (num) { | |
4b4de76e | 1390 | stored_rc = cifs_lockv(xid, tcon, cfile->fid.netfid, |
9ee305b7 PS |
1391 | types[i], num, 0, buf); |
1392 | if (stored_rc) { | |
f45d3416 PS |
1393 | cifs_move_llist(&tmp_llist, |
1394 | &cfile->llist->locks); | |
9ee305b7 PS |
1395 | rc = stored_rc; |
1396 | } else | |
1397 | cifs_free_llist(&tmp_llist); | |
1398 | } | |
1399 | } | |
1400 | ||
1b4b55a1 | 1401 | up_write(&cinode->lock_sem); |
9ee305b7 PS |
1402 | kfree(buf); |
1403 | return rc; | |
1404 | } | |
1405 | ||
03776f45 | 1406 | static int |
f45d3416 | 1407 | cifs_setlk(struct file *file, struct file_lock *flock, __u32 type, |
6d5786a3 PS |
1408 | bool wait_flag, bool posix_lck, int lock, int unlock, |
1409 | unsigned int xid) | |
03776f45 PS |
1410 | { |
1411 | int rc = 0; | |
1412 | __u64 length = 1 + flock->fl_end - flock->fl_start; | |
1413 | struct cifsFileInfo *cfile = (struct cifsFileInfo *)file->private_data; | |
1414 | struct cifs_tcon *tcon = tlink_tcon(cfile->tlink); | |
106dc538 | 1415 | struct TCP_Server_Info *server = tcon->ses->server; |
03776f45 PS |
1416 | |
1417 | if (posix_lck) { | |
08547b03 | 1418 | int posix_lock_type; |
4f6bcec9 PS |
1419 | |
1420 | rc = cifs_posix_lock_set(file, flock); | |
1421 | if (!rc || rc < 0) | |
1422 | return rc; | |
1423 | ||
106dc538 | 1424 | if (type & server->vals->shared_lock_type) |
08547b03 SF |
1425 | posix_lock_type = CIFS_RDLCK; |
1426 | else | |
1427 | posix_lock_type = CIFS_WRLCK; | |
50c2f753 | 1428 | |
03776f45 | 1429 | if (unlock == 1) |
beb84dc8 | 1430 | posix_lock_type = CIFS_UNLCK; |
7ee1af76 | 1431 | |
f45d3416 PS |
1432 | rc = CIFSSMBPosixLock(xid, tcon, cfile->fid.netfid, |
1433 | current->tgid, flock->fl_start, length, | |
1434 | NULL, posix_lock_type, wait_flag); | |
03776f45 PS |
1435 | goto out; |
1436 | } | |
7ee1af76 | 1437 | |
03776f45 | 1438 | if (lock) { |
161ebf9f PS |
1439 | struct cifsLockInfo *lock; |
1440 | ||
fbd35aca | 1441 | lock = cifs_lock_init(flock->fl_start, length, type); |
161ebf9f PS |
1442 | if (!lock) |
1443 | return -ENOMEM; | |
1444 | ||
fbd35aca | 1445 | rc = cifs_lock_add_if(cfile, lock, wait_flag); |
85160e03 | 1446 | if (rc < 0) |
161ebf9f PS |
1447 | kfree(lock); |
1448 | if (rc <= 0) | |
85160e03 PS |
1449 | goto out; |
1450 | ||
d39a4f71 PS |
1451 | rc = server->ops->mand_lock(xid, cfile, flock->fl_start, length, |
1452 | type, 1, 0, wait_flag); | |
161ebf9f PS |
1453 | if (rc) { |
1454 | kfree(lock); | |
1455 | goto out; | |
03776f45 | 1456 | } |
161ebf9f | 1457 | |
fbd35aca | 1458 | cifs_lock_add(cfile, lock); |
9ee305b7 | 1459 | } else if (unlock) |
d39a4f71 | 1460 | rc = server->ops->mand_unlock_range(cfile, flock, xid); |
03776f45 | 1461 | |
03776f45 PS |
1462 | out: |
1463 | if (flock->fl_flags & FL_POSIX) | |
9ebb389d | 1464 | posix_lock_file_wait(file, flock); |
03776f45 PS |
1465 | return rc; |
1466 | } | |
1467 | ||
1468 | int cifs_lock(struct file *file, int cmd, struct file_lock *flock) | |
1469 | { | |
1470 | int rc, xid; | |
1471 | int lock = 0, unlock = 0; | |
1472 | bool wait_flag = false; | |
1473 | bool posix_lck = false; | |
1474 | struct cifs_sb_info *cifs_sb; | |
1475 | struct cifs_tcon *tcon; | |
1476 | struct cifsInodeInfo *cinode; | |
1477 | struct cifsFileInfo *cfile; | |
1478 | __u16 netfid; | |
04a6aa8a | 1479 | __u32 type; |
03776f45 PS |
1480 | |
1481 | rc = -EACCES; | |
6d5786a3 | 1482 | xid = get_xid(); |
03776f45 PS |
1483 | |
1484 | cFYI(1, "Lock parm: 0x%x flockflags: 0x%x flocktype: 0x%x start: %lld " | |
1485 | "end: %lld", cmd, flock->fl_flags, flock->fl_type, | |
1486 | flock->fl_start, flock->fl_end); | |
1487 | ||
03776f45 PS |
1488 | cfile = (struct cifsFileInfo *)file->private_data; |
1489 | tcon = tlink_tcon(cfile->tlink); | |
106dc538 PS |
1490 | |
1491 | cifs_read_flock(flock, &type, &lock, &unlock, &wait_flag, | |
1492 | tcon->ses->server); | |
1493 | ||
1494 | cifs_sb = CIFS_SB(file->f_path.dentry->d_sb); | |
4b4de76e | 1495 | netfid = cfile->fid.netfid; |
03776f45 PS |
1496 | cinode = CIFS_I(file->f_path.dentry->d_inode); |
1497 | ||
29e20f9c | 1498 | if (cap_unix(tcon->ses) && |
03776f45 PS |
1499 | (CIFS_UNIX_FCNTL_CAP & le64_to_cpu(tcon->fsUnixInfo.Capability)) && |
1500 | ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NOPOSIXBRL) == 0)) | |
1501 | posix_lck = true; | |
1502 | /* | |
1503 | * BB add code here to normalize offset and length to account for | |
1504 | * negative length which we can not accept over the wire. | |
1505 | */ | |
1506 | if (IS_GETLK(cmd)) { | |
4f6bcec9 | 1507 | rc = cifs_getlk(file, flock, type, wait_flag, posix_lck, xid); |
6d5786a3 | 1508 | free_xid(xid); |
03776f45 PS |
1509 | return rc; |
1510 | } | |
1511 | ||
1512 | if (!lock && !unlock) { | |
1513 | /* | |
1514 | * if no lock or unlock then nothing to do since we do not | |
1515 | * know what it is | |
1516 | */ | |
6d5786a3 | 1517 | free_xid(xid); |
03776f45 | 1518 | return -EOPNOTSUPP; |
7ee1af76 JA |
1519 | } |
1520 | ||
03776f45 PS |
1521 | rc = cifs_setlk(file, flock, type, wait_flag, posix_lck, lock, unlock, |
1522 | xid); | |
6d5786a3 | 1523 | free_xid(xid); |
1da177e4 LT |
1524 | return rc; |
1525 | } | |
1526 | ||
597b027f JL |
1527 | /* |
1528 | * update the file size (if needed) after a write. Should be called with | |
1529 | * the inode->i_lock held | |
1530 | */ | |
72432ffc | 1531 | void |
fbec9ab9 JL |
1532 | cifs_update_eof(struct cifsInodeInfo *cifsi, loff_t offset, |
1533 | unsigned int bytes_written) | |
1534 | { | |
1535 | loff_t end_of_write = offset + bytes_written; | |
1536 | ||
1537 | if (end_of_write > cifsi->server_eof) | |
1538 | cifsi->server_eof = end_of_write; | |
1539 | } | |
1540 | ||
ba9ad725 PS |
1541 | static ssize_t |
1542 | cifs_write(struct cifsFileInfo *open_file, __u32 pid, const char *write_data, | |
1543 | size_t write_size, loff_t *offset) | |
1da177e4 LT |
1544 | { |
1545 | int rc = 0; | |
1546 | unsigned int bytes_written = 0; | |
1547 | unsigned int total_written; | |
1548 | struct cifs_sb_info *cifs_sb; | |
ba9ad725 PS |
1549 | struct cifs_tcon *tcon; |
1550 | struct TCP_Server_Info *server; | |
6d5786a3 | 1551 | unsigned int xid; |
7da4b49a JL |
1552 | struct dentry *dentry = open_file->dentry; |
1553 | struct cifsInodeInfo *cifsi = CIFS_I(dentry->d_inode); | |
fa2989f4 | 1554 | struct cifs_io_parms io_parms; |
1da177e4 | 1555 | |
7da4b49a | 1556 | cifs_sb = CIFS_SB(dentry->d_sb); |
1da177e4 | 1557 | |
b6b38f70 | 1558 | cFYI(1, "write %zd bytes to offset %lld of %s", write_size, |
ba9ad725 | 1559 | *offset, dentry->d_name.name); |
1da177e4 | 1560 | |
ba9ad725 PS |
1561 | tcon = tlink_tcon(open_file->tlink); |
1562 | server = tcon->ses->server; | |
1563 | ||
1564 | if (!server->ops->sync_write) | |
1565 | return -ENOSYS; | |
50c2f753 | 1566 | |
6d5786a3 | 1567 | xid = get_xid(); |
1da177e4 | 1568 | |
1da177e4 LT |
1569 | for (total_written = 0; write_size > total_written; |
1570 | total_written += bytes_written) { | |
1571 | rc = -EAGAIN; | |
1572 | while (rc == -EAGAIN) { | |
ca83ce3d JL |
1573 | struct kvec iov[2]; |
1574 | unsigned int len; | |
1575 | ||
1da177e4 | 1576 | if (open_file->invalidHandle) { |
1da177e4 LT |
1577 | /* we could deadlock if we called |
1578 | filemap_fdatawait from here so tell | |
fb8c4b14 | 1579 | reopen_file not to flush data to |
1da177e4 | 1580 | server now */ |
15886177 | 1581 | rc = cifs_reopen_file(open_file, false); |
1da177e4 LT |
1582 | if (rc != 0) |
1583 | break; | |
1584 | } | |
ca83ce3d JL |
1585 | |
1586 | len = min((size_t)cifs_sb->wsize, | |
1587 | write_size - total_written); | |
1588 | /* iov[0] is reserved for smb header */ | |
1589 | iov[1].iov_base = (char *)write_data + total_written; | |
1590 | iov[1].iov_len = len; | |
fa2989f4 | 1591 | io_parms.pid = pid; |
ba9ad725 PS |
1592 | io_parms.tcon = tcon; |
1593 | io_parms.offset = *offset; | |
fa2989f4 | 1594 | io_parms.length = len; |
ba9ad725 PS |
1595 | rc = server->ops->sync_write(xid, open_file, &io_parms, |
1596 | &bytes_written, iov, 1); | |
1da177e4 LT |
1597 | } |
1598 | if (rc || (bytes_written == 0)) { | |
1599 | if (total_written) | |
1600 | break; | |
1601 | else { | |
6d5786a3 | 1602 | free_xid(xid); |
1da177e4 LT |
1603 | return rc; |
1604 | } | |
fbec9ab9 | 1605 | } else { |
597b027f | 1606 | spin_lock(&dentry->d_inode->i_lock); |
ba9ad725 | 1607 | cifs_update_eof(cifsi, *offset, bytes_written); |
597b027f | 1608 | spin_unlock(&dentry->d_inode->i_lock); |
ba9ad725 | 1609 | *offset += bytes_written; |
fbec9ab9 | 1610 | } |
1da177e4 LT |
1611 | } |
1612 | ||
ba9ad725 | 1613 | cifs_stats_bytes_written(tcon, total_written); |
1da177e4 | 1614 | |
7da4b49a JL |
1615 | if (total_written > 0) { |
1616 | spin_lock(&dentry->d_inode->i_lock); | |
ba9ad725 PS |
1617 | if (*offset > dentry->d_inode->i_size) |
1618 | i_size_write(dentry->d_inode, *offset); | |
7da4b49a | 1619 | spin_unlock(&dentry->d_inode->i_lock); |
1da177e4 | 1620 | } |
7da4b49a | 1621 | mark_inode_dirty_sync(dentry->d_inode); |
6d5786a3 | 1622 | free_xid(xid); |
1da177e4 LT |
1623 | return total_written; |
1624 | } | |
1625 | ||
6508d904 JL |
1626 | struct cifsFileInfo *find_readable_file(struct cifsInodeInfo *cifs_inode, |
1627 | bool fsuid_only) | |
630f3f0c SF |
1628 | { |
1629 | struct cifsFileInfo *open_file = NULL; | |
6508d904 JL |
1630 | struct cifs_sb_info *cifs_sb = CIFS_SB(cifs_inode->vfs_inode.i_sb); |
1631 | ||
1632 | /* only filter by fsuid on multiuser mounts */ | |
1633 | if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MULTIUSER)) | |
1634 | fsuid_only = false; | |
630f3f0c | 1635 | |
4477288a | 1636 | spin_lock(&cifs_file_list_lock); |
630f3f0c SF |
1637 | /* we could simply get the first_list_entry since write-only entries |
1638 | are always at the end of the list but since the first entry might | |
1639 | have a close pending, we go through the whole list */ | |
1640 | list_for_each_entry(open_file, &cifs_inode->openFileList, flist) { | |
6508d904 JL |
1641 | if (fsuid_only && open_file->uid != current_fsuid()) |
1642 | continue; | |
2e396b83 | 1643 | if (OPEN_FMODE(open_file->f_flags) & FMODE_READ) { |
630f3f0c SF |
1644 | if (!open_file->invalidHandle) { |
1645 | /* found a good file */ | |
1646 | /* lock it so it will not be closed on us */ | |
764a1b1a | 1647 | cifsFileInfo_get_locked(open_file); |
4477288a | 1648 | spin_unlock(&cifs_file_list_lock); |
630f3f0c SF |
1649 | return open_file; |
1650 | } /* else might as well continue, and look for | |
1651 | another, or simply have the caller reopen it | |
1652 | again rather than trying to fix this handle */ | |
1653 | } else /* write only file */ | |
1654 | break; /* write only files are last so must be done */ | |
1655 | } | |
4477288a | 1656 | spin_unlock(&cifs_file_list_lock); |
630f3f0c SF |
1657 | return NULL; |
1658 | } | |
630f3f0c | 1659 | |
6508d904 JL |
1660 | struct cifsFileInfo *find_writable_file(struct cifsInodeInfo *cifs_inode, |
1661 | bool fsuid_only) | |
6148a742 | 1662 | { |
2c0c2a08 | 1663 | struct cifsFileInfo *open_file, *inv_file = NULL; |
d3892294 | 1664 | struct cifs_sb_info *cifs_sb; |
2846d386 | 1665 | bool any_available = false; |
dd99cd80 | 1666 | int rc; |
2c0c2a08 | 1667 | unsigned int refind = 0; |
6148a742 | 1668 | |
60808233 SF |
1669 | /* Having a null inode here (because mapping->host was set to zero by |
1670 | the VFS or MM) should not happen but we had reports of on oops (due to | |
1671 | it being zero) during stress testcases so we need to check for it */ | |
1672 | ||
fb8c4b14 | 1673 | if (cifs_inode == NULL) { |
b6b38f70 | 1674 | cERROR(1, "Null inode passed to cifs_writeable_file"); |
60808233 SF |
1675 | dump_stack(); |
1676 | return NULL; | |
1677 | } | |
1678 | ||
d3892294 JL |
1679 | cifs_sb = CIFS_SB(cifs_inode->vfs_inode.i_sb); |
1680 | ||
6508d904 JL |
1681 | /* only filter by fsuid on multiuser mounts */ |
1682 | if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MULTIUSER)) | |
1683 | fsuid_only = false; | |
1684 | ||
4477288a | 1685 | spin_lock(&cifs_file_list_lock); |
9b22b0b7 | 1686 | refind_writable: |
2c0c2a08 SP |
1687 | if (refind > MAX_REOPEN_ATT) { |
1688 | spin_unlock(&cifs_file_list_lock); | |
1689 | return NULL; | |
1690 | } | |
6148a742 | 1691 | list_for_each_entry(open_file, &cifs_inode->openFileList, flist) { |
6508d904 JL |
1692 | if (!any_available && open_file->pid != current->tgid) |
1693 | continue; | |
1694 | if (fsuid_only && open_file->uid != current_fsuid()) | |
6148a742 | 1695 | continue; |
2e396b83 | 1696 | if (OPEN_FMODE(open_file->f_flags) & FMODE_WRITE) { |
9b22b0b7 SF |
1697 | if (!open_file->invalidHandle) { |
1698 | /* found a good writable file */ | |
764a1b1a | 1699 | cifsFileInfo_get_locked(open_file); |
4477288a | 1700 | spin_unlock(&cifs_file_list_lock); |
9b22b0b7 | 1701 | return open_file; |
2c0c2a08 SP |
1702 | } else { |
1703 | if (!inv_file) | |
1704 | inv_file = open_file; | |
9b22b0b7 | 1705 | } |
6148a742 SF |
1706 | } |
1707 | } | |
2846d386 JL |
1708 | /* couldn't find useable FH with same pid, try any available */ |
1709 | if (!any_available) { | |
1710 | any_available = true; | |
1711 | goto refind_writable; | |
1712 | } | |
2c0c2a08 SP |
1713 | |
1714 | if (inv_file) { | |
1715 | any_available = false; | |
764a1b1a | 1716 | cifsFileInfo_get_locked(inv_file); |
2c0c2a08 SP |
1717 | } |
1718 | ||
4477288a | 1719 | spin_unlock(&cifs_file_list_lock); |
2c0c2a08 SP |
1720 | |
1721 | if (inv_file) { | |
1722 | rc = cifs_reopen_file(inv_file, false); | |
1723 | if (!rc) | |
1724 | return inv_file; | |
1725 | else { | |
1726 | spin_lock(&cifs_file_list_lock); | |
1727 | list_move_tail(&inv_file->flist, | |
1728 | &cifs_inode->openFileList); | |
1729 | spin_unlock(&cifs_file_list_lock); | |
1730 | cifsFileInfo_put(inv_file); | |
1731 | spin_lock(&cifs_file_list_lock); | |
1732 | ++refind; | |
1733 | goto refind_writable; | |
1734 | } | |
1735 | } | |
1736 | ||
6148a742 SF |
1737 | return NULL; |
1738 | } | |
1739 | ||
1da177e4 LT |
1740 | static int cifs_partialpagewrite(struct page *page, unsigned from, unsigned to) |
1741 | { | |
1742 | struct address_space *mapping = page->mapping; | |
1743 | loff_t offset = (loff_t)page->index << PAGE_CACHE_SHIFT; | |
1744 | char *write_data; | |
1745 | int rc = -EFAULT; | |
1746 | int bytes_written = 0; | |
1da177e4 | 1747 | struct inode *inode; |
6148a742 | 1748 | struct cifsFileInfo *open_file; |
1da177e4 LT |
1749 | |
1750 | if (!mapping || !mapping->host) | |
1751 | return -EFAULT; | |
1752 | ||
1753 | inode = page->mapping->host; | |
1da177e4 LT |
1754 | |
1755 | offset += (loff_t)from; | |
1756 | write_data = kmap(page); | |
1757 | write_data += from; | |
1758 | ||
1759 | if ((to > PAGE_CACHE_SIZE) || (from > to)) { | |
1760 | kunmap(page); | |
1761 | return -EIO; | |
1762 | } | |
1763 | ||
1764 | /* racing with truncate? */ | |
1765 | if (offset > mapping->host->i_size) { | |
1766 | kunmap(page); | |
1767 | return 0; /* don't care */ | |
1768 | } | |
1769 | ||
1770 | /* check to make sure that we are not extending the file */ | |
1771 | if (mapping->host->i_size - offset < (loff_t)to) | |
fb8c4b14 | 1772 | to = (unsigned)(mapping->host->i_size - offset); |
1da177e4 | 1773 | |
6508d904 | 1774 | open_file = find_writable_file(CIFS_I(mapping->host), false); |
6148a742 | 1775 | if (open_file) { |
fa2989f4 PS |
1776 | bytes_written = cifs_write(open_file, open_file->pid, |
1777 | write_data, to - from, &offset); | |
6ab409b5 | 1778 | cifsFileInfo_put(open_file); |
1da177e4 | 1779 | /* Does mm or vfs already set times? */ |
6148a742 | 1780 | inode->i_atime = inode->i_mtime = current_fs_time(inode->i_sb); |
bb5a9a04 | 1781 | if ((bytes_written > 0) && (offset)) |
6148a742 | 1782 | rc = 0; |
bb5a9a04 SF |
1783 | else if (bytes_written < 0) |
1784 | rc = bytes_written; | |
6148a742 | 1785 | } else { |
b6b38f70 | 1786 | cFYI(1, "No writeable filehandles for inode"); |
1da177e4 LT |
1787 | rc = -EIO; |
1788 | } | |
1789 | ||
1790 | kunmap(page); | |
1791 | return rc; | |
1792 | } | |
1793 | ||
1da177e4 | 1794 | static int cifs_writepages(struct address_space *mapping, |
37c0eb46 | 1795 | struct writeback_control *wbc) |
1da177e4 | 1796 | { |
c3d17b63 JL |
1797 | struct cifs_sb_info *cifs_sb = CIFS_SB(mapping->host->i_sb); |
1798 | bool done = false, scanned = false, range_whole = false; | |
1799 | pgoff_t end, index; | |
1800 | struct cifs_writedata *wdata; | |
c9de5c80 | 1801 | struct TCP_Server_Info *server; |
37c0eb46 | 1802 | struct page *page; |
37c0eb46 | 1803 | int rc = 0; |
50c2f753 | 1804 | |
37c0eb46 | 1805 | /* |
c3d17b63 | 1806 | * If wsize is smaller than the page cache size, default to writing |
37c0eb46 SF |
1807 | * one page at a time via cifs_writepage |
1808 | */ | |
1809 | if (cifs_sb->wsize < PAGE_CACHE_SIZE) | |
1810 | return generic_writepages(mapping, wbc); | |
1811 | ||
111ebb6e | 1812 | if (wbc->range_cyclic) { |
37c0eb46 | 1813 | index = mapping->writeback_index; /* Start from prev offset */ |
111ebb6e OH |
1814 | end = -1; |
1815 | } else { | |
1816 | index = wbc->range_start >> PAGE_CACHE_SHIFT; | |
1817 | end = wbc->range_end >> PAGE_CACHE_SHIFT; | |
1818 | if (wbc->range_start == 0 && wbc->range_end == LLONG_MAX) | |
c3d17b63 JL |
1819 | range_whole = true; |
1820 | scanned = true; | |
37c0eb46 SF |
1821 | } |
1822 | retry: | |
c3d17b63 JL |
1823 | while (!done && index <= end) { |
1824 | unsigned int i, nr_pages, found_pages; | |
1825 | pgoff_t next = 0, tofind; | |
1826 | struct page **pages; | |
1827 | ||
1828 | tofind = min((cifs_sb->wsize / PAGE_CACHE_SIZE) - 1, | |
1829 | end - index) + 1; | |
1830 | ||
c2e87640 JL |
1831 | wdata = cifs_writedata_alloc((unsigned int)tofind, |
1832 | cifs_writev_complete); | |
c3d17b63 JL |
1833 | if (!wdata) { |
1834 | rc = -ENOMEM; | |
1835 | break; | |
1836 | } | |
1837 | ||
1838 | /* | |
1839 | * find_get_pages_tag seems to return a max of 256 on each | |
1840 | * iteration, so we must call it several times in order to | |
1841 | * fill the array or the wsize is effectively limited to | |
1842 | * 256 * PAGE_CACHE_SIZE. | |
1843 | */ | |
1844 | found_pages = 0; | |
1845 | pages = wdata->pages; | |
1846 | do { | |
1847 | nr_pages = find_get_pages_tag(mapping, &index, | |
1848 | PAGECACHE_TAG_DIRTY, | |
1849 | tofind, pages); | |
1850 | found_pages += nr_pages; | |
1851 | tofind -= nr_pages; | |
1852 | pages += nr_pages; | |
1853 | } while (nr_pages && tofind && index <= end); | |
1854 | ||
1855 | if (found_pages == 0) { | |
1856 | kref_put(&wdata->refcount, cifs_writedata_release); | |
1857 | break; | |
1858 | } | |
1859 | ||
1860 | nr_pages = 0; | |
1861 | for (i = 0; i < found_pages; i++) { | |
1862 | page = wdata->pages[i]; | |
37c0eb46 SF |
1863 | /* |
1864 | * At this point we hold neither mapping->tree_lock nor | |
1865 | * lock on the page itself: the page may be truncated or | |
1866 | * invalidated (changing page->mapping to NULL), or even | |
1867 | * swizzled back from swapper_space to tmpfs file | |
1868 | * mapping | |
1869 | */ | |
1870 | ||
c3d17b63 | 1871 | if (nr_pages == 0) |
37c0eb46 | 1872 | lock_page(page); |
529ae9aa | 1873 | else if (!trylock_page(page)) |
37c0eb46 SF |
1874 | break; |
1875 | ||
1876 | if (unlikely(page->mapping != mapping)) { | |
1877 | unlock_page(page); | |
1878 | break; | |
1879 | } | |
1880 | ||
111ebb6e | 1881 | if (!wbc->range_cyclic && page->index > end) { |
c3d17b63 | 1882 | done = true; |
37c0eb46 SF |
1883 | unlock_page(page); |
1884 | break; | |
1885 | } | |
1886 | ||
1887 | if (next && (page->index != next)) { | |
1888 | /* Not next consecutive page */ | |
1889 | unlock_page(page); | |
1890 | break; | |
1891 | } | |
1892 | ||
1893 | if (wbc->sync_mode != WB_SYNC_NONE) | |
1894 | wait_on_page_writeback(page); | |
1895 | ||
1896 | if (PageWriteback(page) || | |
cb876f45 | 1897 | !clear_page_dirty_for_io(page)) { |
37c0eb46 SF |
1898 | unlock_page(page); |
1899 | break; | |
1900 | } | |
84d2f07e | 1901 | |
cb876f45 LT |
1902 | /* |
1903 | * This actually clears the dirty bit in the radix tree. | |
1904 | * See cifs_writepage() for more commentary. | |
1905 | */ | |
1906 | set_page_writeback(page); | |
1907 | ||
3a98b861 | 1908 | if (page_offset(page) >= i_size_read(mapping->host)) { |
c3d17b63 | 1909 | done = true; |
84d2f07e | 1910 | unlock_page(page); |
cb876f45 | 1911 | end_page_writeback(page); |
84d2f07e SF |
1912 | break; |
1913 | } | |
1914 | ||
c3d17b63 JL |
1915 | wdata->pages[i] = page; |
1916 | next = page->index + 1; | |
1917 | ++nr_pages; | |
1918 | } | |
37c0eb46 | 1919 | |
c3d17b63 JL |
1920 | /* reset index to refind any pages skipped */ |
1921 | if (nr_pages == 0) | |
1922 | index = wdata->pages[0]->index + 1; | |
84d2f07e | 1923 | |
c3d17b63 JL |
1924 | /* put any pages we aren't going to use */ |
1925 | for (i = nr_pages; i < found_pages; i++) { | |
1926 | page_cache_release(wdata->pages[i]); | |
1927 | wdata->pages[i] = NULL; | |
1928 | } | |
37c0eb46 | 1929 | |
c3d17b63 JL |
1930 | /* nothing to write? */ |
1931 | if (nr_pages == 0) { | |
1932 | kref_put(&wdata->refcount, cifs_writedata_release); | |
1933 | continue; | |
37c0eb46 | 1934 | } |
fbec9ab9 | 1935 | |
c3d17b63 JL |
1936 | wdata->sync_mode = wbc->sync_mode; |
1937 | wdata->nr_pages = nr_pages; | |
1938 | wdata->offset = page_offset(wdata->pages[0]); | |
eddb079d JL |
1939 | wdata->pagesz = PAGE_CACHE_SIZE; |
1940 | wdata->tailsz = | |
3a98b861 JL |
1941 | min(i_size_read(mapping->host) - |
1942 | page_offset(wdata->pages[nr_pages - 1]), | |
eddb079d JL |
1943 | (loff_t)PAGE_CACHE_SIZE); |
1944 | wdata->bytes = ((nr_pages - 1) * PAGE_CACHE_SIZE) + | |
1945 | wdata->tailsz; | |
941b853d | 1946 | |
c3d17b63 JL |
1947 | do { |
1948 | if (wdata->cfile != NULL) | |
1949 | cifsFileInfo_put(wdata->cfile); | |
1950 | wdata->cfile = find_writable_file(CIFS_I(mapping->host), | |
1951 | false); | |
1952 | if (!wdata->cfile) { | |
1953 | cERROR(1, "No writable handles for inode"); | |
1954 | rc = -EBADF; | |
1955 | break; | |
941b853d | 1956 | } |
fe5f5d2e | 1957 | wdata->pid = wdata->cfile->pid; |
c9de5c80 PS |
1958 | server = tlink_tcon(wdata->cfile->tlink)->ses->server; |
1959 | rc = server->ops->async_writev(wdata); | |
c3d17b63 | 1960 | } while (wbc->sync_mode == WB_SYNC_ALL && rc == -EAGAIN); |
941b853d | 1961 | |
c3d17b63 JL |
1962 | for (i = 0; i < nr_pages; ++i) |
1963 | unlock_page(wdata->pages[i]); | |
f3983c21 | 1964 | |
c3d17b63 JL |
1965 | /* send failure -- clean up the mess */ |
1966 | if (rc != 0) { | |
1967 | for (i = 0; i < nr_pages; ++i) { | |
941b853d | 1968 | if (rc == -EAGAIN) |
c3d17b63 JL |
1969 | redirty_page_for_writepage(wbc, |
1970 | wdata->pages[i]); | |
1971 | else | |
1972 | SetPageError(wdata->pages[i]); | |
1973 | end_page_writeback(wdata->pages[i]); | |
1974 | page_cache_release(wdata->pages[i]); | |
37c0eb46 | 1975 | } |
941b853d JL |
1976 | if (rc != -EAGAIN) |
1977 | mapping_set_error(mapping, rc); | |
c3d17b63 JL |
1978 | } |
1979 | kref_put(&wdata->refcount, cifs_writedata_release); | |
941b853d | 1980 | |
c3d17b63 JL |
1981 | wbc->nr_to_write -= nr_pages; |
1982 | if (wbc->nr_to_write <= 0) | |
1983 | done = true; | |
b066a48c | 1984 | |
c3d17b63 | 1985 | index = next; |
37c0eb46 | 1986 | } |
c3d17b63 | 1987 | |
37c0eb46 SF |
1988 | if (!scanned && !done) { |
1989 | /* | |
1990 | * We hit the last page and there is more work to be done: wrap | |
1991 | * back to the start of the file | |
1992 | */ | |
c3d17b63 | 1993 | scanned = true; |
37c0eb46 SF |
1994 | index = 0; |
1995 | goto retry; | |
1996 | } | |
c3d17b63 | 1997 | |
111ebb6e | 1998 | if (wbc->range_cyclic || (range_whole && wbc->nr_to_write > 0)) |
37c0eb46 SF |
1999 | mapping->writeback_index = index; |
2000 | ||
1da177e4 LT |
2001 | return rc; |
2002 | } | |
1da177e4 | 2003 | |
9ad1506b PS |
2004 | static int |
2005 | cifs_writepage_locked(struct page *page, struct writeback_control *wbc) | |
1da177e4 | 2006 | { |
9ad1506b | 2007 | int rc; |
6d5786a3 | 2008 | unsigned int xid; |
1da177e4 | 2009 | |
6d5786a3 | 2010 | xid = get_xid(); |
1da177e4 LT |
2011 | /* BB add check for wbc flags */ |
2012 | page_cache_get(page); | |
ad7a2926 | 2013 | if (!PageUptodate(page)) |
b6b38f70 | 2014 | cFYI(1, "ppw - page not up to date"); |
cb876f45 LT |
2015 | |
2016 | /* | |
2017 | * Set the "writeback" flag, and clear "dirty" in the radix tree. | |
2018 | * | |
2019 | * A writepage() implementation always needs to do either this, | |
2020 | * or re-dirty the page with "redirty_page_for_writepage()" in | |
2021 | * the case of a failure. | |
2022 | * | |
2023 | * Just unlocking the page will cause the radix tree tag-bits | |
2024 | * to fail to update with the state of the page correctly. | |
2025 | */ | |
fb8c4b14 | 2026 | set_page_writeback(page); |
9ad1506b | 2027 | retry_write: |
1da177e4 | 2028 | rc = cifs_partialpagewrite(page, 0, PAGE_CACHE_SIZE); |
9ad1506b PS |
2029 | if (rc == -EAGAIN && wbc->sync_mode == WB_SYNC_ALL) |
2030 | goto retry_write; | |
2031 | else if (rc == -EAGAIN) | |
2032 | redirty_page_for_writepage(wbc, page); | |
2033 | else if (rc != 0) | |
2034 | SetPageError(page); | |
2035 | else | |
2036 | SetPageUptodate(page); | |
cb876f45 LT |
2037 | end_page_writeback(page); |
2038 | page_cache_release(page); | |
6d5786a3 | 2039 | free_xid(xid); |
1da177e4 LT |
2040 | return rc; |
2041 | } | |
2042 | ||
9ad1506b PS |
2043 | static int cifs_writepage(struct page *page, struct writeback_control *wbc) |
2044 | { | |
2045 | int rc = cifs_writepage_locked(page, wbc); | |
2046 | unlock_page(page); | |
2047 | return rc; | |
2048 | } | |
2049 | ||
d9414774 NP |
2050 | static int cifs_write_end(struct file *file, struct address_space *mapping, |
2051 | loff_t pos, unsigned len, unsigned copied, | |
2052 | struct page *page, void *fsdata) | |
1da177e4 | 2053 | { |
d9414774 NP |
2054 | int rc; |
2055 | struct inode *inode = mapping->host; | |
d4ffff1f PS |
2056 | struct cifsFileInfo *cfile = file->private_data; |
2057 | struct cifs_sb_info *cifs_sb = CIFS_SB(cfile->dentry->d_sb); | |
2058 | __u32 pid; | |
2059 | ||
2060 | if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_RWPIDFORWARD) | |
2061 | pid = cfile->pid; | |
2062 | else | |
2063 | pid = current->tgid; | |
1da177e4 | 2064 | |
b6b38f70 JP |
2065 | cFYI(1, "write_end for page %p from pos %lld with %d bytes", |
2066 | page, pos, copied); | |
d9414774 | 2067 | |
a98ee8c1 JL |
2068 | if (PageChecked(page)) { |
2069 | if (copied == len) | |
2070 | SetPageUptodate(page); | |
2071 | ClearPageChecked(page); | |
2072 | } else if (!PageUptodate(page) && copied == PAGE_CACHE_SIZE) | |
d9414774 | 2073 | SetPageUptodate(page); |
ad7a2926 | 2074 | |
1da177e4 | 2075 | if (!PageUptodate(page)) { |
d9414774 NP |
2076 | char *page_data; |
2077 | unsigned offset = pos & (PAGE_CACHE_SIZE - 1); | |
6d5786a3 | 2078 | unsigned int xid; |
d9414774 | 2079 | |
6d5786a3 | 2080 | xid = get_xid(); |
1da177e4 LT |
2081 | /* this is probably better than directly calling |
2082 | partialpage_write since in this function the file handle is | |
2083 | known which we might as well leverage */ | |
2084 | /* BB check if anything else missing out of ppw | |
2085 | such as updating last write time */ | |
2086 | page_data = kmap(page); | |
d4ffff1f | 2087 | rc = cifs_write(cfile, pid, page_data + offset, copied, &pos); |
d9414774 | 2088 | /* if (rc < 0) should we set writebehind rc? */ |
1da177e4 | 2089 | kunmap(page); |
d9414774 | 2090 | |
6d5786a3 | 2091 | free_xid(xid); |
fb8c4b14 | 2092 | } else { |
d9414774 NP |
2093 | rc = copied; |
2094 | pos += copied; | |
1da177e4 LT |
2095 | set_page_dirty(page); |
2096 | } | |
2097 | ||
d9414774 NP |
2098 | if (rc > 0) { |
2099 | spin_lock(&inode->i_lock); | |
2100 | if (pos > inode->i_size) | |
2101 | i_size_write(inode, pos); | |
2102 | spin_unlock(&inode->i_lock); | |
2103 | } | |
2104 | ||
2105 | unlock_page(page); | |
2106 | page_cache_release(page); | |
2107 | ||
1da177e4 LT |
2108 | return rc; |
2109 | } | |
2110 | ||
02c24a82 JB |
2111 | int cifs_strict_fsync(struct file *file, loff_t start, loff_t end, |
2112 | int datasync) | |
1da177e4 | 2113 | { |
6d5786a3 | 2114 | unsigned int xid; |
1da177e4 | 2115 | int rc = 0; |
96daf2b0 | 2116 | struct cifs_tcon *tcon; |
1d8c4c00 | 2117 | struct TCP_Server_Info *server; |
c21dfb69 | 2118 | struct cifsFileInfo *smbfile = file->private_data; |
e6a00296 | 2119 | struct inode *inode = file->f_path.dentry->d_inode; |
8be7e6ba | 2120 | struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb); |
1da177e4 | 2121 | |
02c24a82 JB |
2122 | rc = filemap_write_and_wait_range(inode->i_mapping, start, end); |
2123 | if (rc) | |
2124 | return rc; | |
2125 | mutex_lock(&inode->i_mutex); | |
2126 | ||
6d5786a3 | 2127 | xid = get_xid(); |
1da177e4 | 2128 | |
b6b38f70 | 2129 | cFYI(1, "Sync file - name: %s datasync: 0x%x", |
7ea80859 | 2130 | file->f_path.dentry->d_name.name, datasync); |
50c2f753 | 2131 | |
6feb9891 PS |
2132 | if (!CIFS_I(inode)->clientCanCacheRead) { |
2133 | rc = cifs_invalidate_mapping(inode); | |
2134 | if (rc) { | |
2135 | cFYI(1, "rc: %d during invalidate phase", rc); | |
2136 | rc = 0; /* don't care about it in fsync */ | |
2137 | } | |
2138 | } | |
eb4b756b | 2139 | |
8be7e6ba | 2140 | tcon = tlink_tcon(smbfile->tlink); |
1d8c4c00 PS |
2141 | if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NOSSYNC)) { |
2142 | server = tcon->ses->server; | |
2143 | if (server->ops->flush) | |
2144 | rc = server->ops->flush(xid, tcon, &smbfile->fid); | |
2145 | else | |
2146 | rc = -ENOSYS; | |
2147 | } | |
8be7e6ba | 2148 | |
6d5786a3 | 2149 | free_xid(xid); |
02c24a82 | 2150 | mutex_unlock(&inode->i_mutex); |
8be7e6ba PS |
2151 | return rc; |
2152 | } | |
2153 | ||
02c24a82 | 2154 | int cifs_fsync(struct file *file, loff_t start, loff_t end, int datasync) |
8be7e6ba | 2155 | { |
6d5786a3 | 2156 | unsigned int xid; |
8be7e6ba | 2157 | int rc = 0; |
96daf2b0 | 2158 | struct cifs_tcon *tcon; |
1d8c4c00 | 2159 | struct TCP_Server_Info *server; |
8be7e6ba PS |
2160 | struct cifsFileInfo *smbfile = file->private_data; |
2161 | struct cifs_sb_info *cifs_sb = CIFS_SB(file->f_path.dentry->d_sb); | |
02c24a82 JB |
2162 | struct inode *inode = file->f_mapping->host; |
2163 | ||
2164 | rc = filemap_write_and_wait_range(inode->i_mapping, start, end); | |
2165 | if (rc) | |
2166 | return rc; | |
2167 | mutex_lock(&inode->i_mutex); | |
8be7e6ba | 2168 | |
6d5786a3 | 2169 | xid = get_xid(); |
8be7e6ba PS |
2170 | |
2171 | cFYI(1, "Sync file - name: %s datasync: 0x%x", | |
2172 | file->f_path.dentry->d_name.name, datasync); | |
2173 | ||
2174 | tcon = tlink_tcon(smbfile->tlink); | |
1d8c4c00 PS |
2175 | if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NOSSYNC)) { |
2176 | server = tcon->ses->server; | |
2177 | if (server->ops->flush) | |
2178 | rc = server->ops->flush(xid, tcon, &smbfile->fid); | |
2179 | else | |
2180 | rc = -ENOSYS; | |
2181 | } | |
b298f223 | 2182 | |
6d5786a3 | 2183 | free_xid(xid); |
02c24a82 | 2184 | mutex_unlock(&inode->i_mutex); |
1da177e4 LT |
2185 | return rc; |
2186 | } | |
2187 | ||
1da177e4 LT |
2188 | /* |
2189 | * As file closes, flush all cached write data for this inode checking | |
2190 | * for write behind errors. | |
2191 | */ | |
75e1fcc0 | 2192 | int cifs_flush(struct file *file, fl_owner_t id) |
1da177e4 | 2193 | { |
fb8c4b14 | 2194 | struct inode *inode = file->f_path.dentry->d_inode; |
1da177e4 LT |
2195 | int rc = 0; |
2196 | ||
eb4b756b | 2197 | if (file->f_mode & FMODE_WRITE) |
d3f1322a | 2198 | rc = filemap_write_and_wait(inode->i_mapping); |
50c2f753 | 2199 | |
b6b38f70 | 2200 | cFYI(1, "Flush inode %p file %p rc %d", inode, file, rc); |
1da177e4 LT |
2201 | |
2202 | return rc; | |
2203 | } | |
2204 | ||
72432ffc PS |
2205 | static int |
2206 | cifs_write_allocate_pages(struct page **pages, unsigned long num_pages) | |
2207 | { | |
2208 | int rc = 0; | |
2209 | unsigned long i; | |
2210 | ||
2211 | for (i = 0; i < num_pages; i++) { | |
e94f7ba1 | 2212 | pages[i] = alloc_page(GFP_KERNEL|__GFP_HIGHMEM); |
72432ffc PS |
2213 | if (!pages[i]) { |
2214 | /* | |
2215 | * save number of pages we have already allocated and | |
2216 | * return with ENOMEM error | |
2217 | */ | |
2218 | num_pages = i; | |
2219 | rc = -ENOMEM; | |
e94f7ba1 | 2220 | break; |
72432ffc PS |
2221 | } |
2222 | } | |
2223 | ||
e94f7ba1 JL |
2224 | if (rc) { |
2225 | for (i = 0; i < num_pages; i++) | |
2226 | put_page(pages[i]); | |
2227 | } | |
72432ffc PS |
2228 | return rc; |
2229 | } | |
2230 | ||
2231 | static inline | |
2232 | size_t get_numpages(const size_t wsize, const size_t len, size_t *cur_len) | |
2233 | { | |
2234 | size_t num_pages; | |
2235 | size_t clen; | |
2236 | ||
2237 | clen = min_t(const size_t, len, wsize); | |
a7103b99 | 2238 | num_pages = DIV_ROUND_UP(clen, PAGE_SIZE); |
72432ffc PS |
2239 | |
2240 | if (cur_len) | |
2241 | *cur_len = clen; | |
2242 | ||
2243 | return num_pages; | |
2244 | } | |
2245 | ||
da82f7e7 JL |
2246 | static void |
2247 | cifs_uncached_writev_complete(struct work_struct *work) | |
2248 | { | |
2249 | int i; | |
2250 | struct cifs_writedata *wdata = container_of(work, | |
2251 | struct cifs_writedata, work); | |
2252 | struct inode *inode = wdata->cfile->dentry->d_inode; | |
2253 | struct cifsInodeInfo *cifsi = CIFS_I(inode); | |
2254 | ||
2255 | spin_lock(&inode->i_lock); | |
2256 | cifs_update_eof(cifsi, wdata->offset, wdata->bytes); | |
2257 | if (cifsi->server_eof > inode->i_size) | |
2258 | i_size_write(inode, cifsi->server_eof); | |
2259 | spin_unlock(&inode->i_lock); | |
2260 | ||
2261 | complete(&wdata->done); | |
2262 | ||
2263 | if (wdata->result != -EAGAIN) { | |
2264 | for (i = 0; i < wdata->nr_pages; i++) | |
2265 | put_page(wdata->pages[i]); | |
2266 | } | |
2267 | ||
2268 | kref_put(&wdata->refcount, cifs_writedata_release); | |
2269 | } | |
2270 | ||
2271 | /* attempt to send write to server, retry on any -EAGAIN errors */ | |
2272 | static int | |
2273 | cifs_uncached_retry_writev(struct cifs_writedata *wdata) | |
2274 | { | |
2275 | int rc; | |
c9de5c80 PS |
2276 | struct TCP_Server_Info *server; |
2277 | ||
2278 | server = tlink_tcon(wdata->cfile->tlink)->ses->server; | |
da82f7e7 JL |
2279 | |
2280 | do { | |
2281 | if (wdata->cfile->invalidHandle) { | |
2282 | rc = cifs_reopen_file(wdata->cfile, false); | |
2283 | if (rc != 0) | |
2284 | continue; | |
2285 | } | |
c9de5c80 | 2286 | rc = server->ops->async_writev(wdata); |
da82f7e7 JL |
2287 | } while (rc == -EAGAIN); |
2288 | ||
2289 | return rc; | |
2290 | } | |
2291 | ||
72432ffc PS |
2292 | static ssize_t |
2293 | cifs_iovec_write(struct file *file, const struct iovec *iov, | |
2294 | unsigned long nr_segs, loff_t *poffset) | |
2295 | { | |
da82f7e7 | 2296 | unsigned long nr_pages, i; |
76429c14 PS |
2297 | size_t copied, len, cur_len; |
2298 | ssize_t total_written = 0; | |
3af9d8f2 | 2299 | loff_t offset; |
72432ffc | 2300 | struct iov_iter it; |
72432ffc | 2301 | struct cifsFileInfo *open_file; |
da82f7e7 | 2302 | struct cifs_tcon *tcon; |
72432ffc | 2303 | struct cifs_sb_info *cifs_sb; |
da82f7e7 JL |
2304 | struct cifs_writedata *wdata, *tmp; |
2305 | struct list_head wdata_list; | |
2306 | int rc; | |
2307 | pid_t pid; | |
72432ffc PS |
2308 | |
2309 | len = iov_length(iov, nr_segs); | |
2310 | if (!len) | |
2311 | return 0; | |
2312 | ||
2313 | rc = generic_write_checks(file, poffset, &len, 0); | |
2314 | if (rc) | |
2315 | return rc; | |
2316 | ||
da82f7e7 | 2317 | INIT_LIST_HEAD(&wdata_list); |
72432ffc | 2318 | cifs_sb = CIFS_SB(file->f_path.dentry->d_sb); |
72432ffc | 2319 | open_file = file->private_data; |
da82f7e7 | 2320 | tcon = tlink_tcon(open_file->tlink); |
c9de5c80 PS |
2321 | |
2322 | if (!tcon->ses->server->ops->async_writev) | |
2323 | return -ENOSYS; | |
2324 | ||
3af9d8f2 | 2325 | offset = *poffset; |
d4ffff1f PS |
2326 | |
2327 | if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_RWPIDFORWARD) | |
2328 | pid = open_file->pid; | |
2329 | else | |
2330 | pid = current->tgid; | |
2331 | ||
72432ffc | 2332 | iov_iter_init(&it, iov, nr_segs, len, 0); |
72432ffc | 2333 | do { |
da82f7e7 JL |
2334 | size_t save_len; |
2335 | ||
2336 | nr_pages = get_numpages(cifs_sb->wsize, len, &cur_len); | |
2337 | wdata = cifs_writedata_alloc(nr_pages, | |
2338 | cifs_uncached_writev_complete); | |
2339 | if (!wdata) { | |
2340 | rc = -ENOMEM; | |
2341 | break; | |
2342 | } | |
2343 | ||
2344 | rc = cifs_write_allocate_pages(wdata->pages, nr_pages); | |
2345 | if (rc) { | |
2346 | kfree(wdata); | |
2347 | break; | |
2348 | } | |
2349 | ||
2350 | save_len = cur_len; | |
2351 | for (i = 0; i < nr_pages; i++) { | |
2352 | copied = min_t(const size_t, cur_len, PAGE_SIZE); | |
2353 | copied = iov_iter_copy_from_user(wdata->pages[i], &it, | |
2354 | 0, copied); | |
72432ffc PS |
2355 | cur_len -= copied; |
2356 | iov_iter_advance(&it, copied); | |
72432ffc | 2357 | } |
72432ffc PS |
2358 | cur_len = save_len - cur_len; |
2359 | ||
da82f7e7 JL |
2360 | wdata->sync_mode = WB_SYNC_ALL; |
2361 | wdata->nr_pages = nr_pages; | |
2362 | wdata->offset = (__u64)offset; | |
2363 | wdata->cfile = cifsFileInfo_get(open_file); | |
2364 | wdata->pid = pid; | |
2365 | wdata->bytes = cur_len; | |
eddb079d JL |
2366 | wdata->pagesz = PAGE_SIZE; |
2367 | wdata->tailsz = cur_len - ((nr_pages - 1) * PAGE_SIZE); | |
da82f7e7 JL |
2368 | rc = cifs_uncached_retry_writev(wdata); |
2369 | if (rc) { | |
2370 | kref_put(&wdata->refcount, cifs_writedata_release); | |
72432ffc PS |
2371 | break; |
2372 | } | |
2373 | ||
da82f7e7 JL |
2374 | list_add_tail(&wdata->list, &wdata_list); |
2375 | offset += cur_len; | |
2376 | len -= cur_len; | |
72432ffc PS |
2377 | } while (len > 0); |
2378 | ||
da82f7e7 JL |
2379 | /* |
2380 | * If at least one write was successfully sent, then discard any rc | |
2381 | * value from the later writes. If the other write succeeds, then | |
2382 | * we'll end up returning whatever was written. If it fails, then | |
2383 | * we'll get a new rc value from that. | |
2384 | */ | |
2385 | if (!list_empty(&wdata_list)) | |
2386 | rc = 0; | |
2387 | ||
2388 | /* | |
2389 | * Wait for and collect replies for any successful sends in order of | |
2390 | * increasing offset. Once an error is hit or we get a fatal signal | |
2391 | * while waiting, then return without waiting for any more replies. | |
2392 | */ | |
2393 | restart_loop: | |
2394 | list_for_each_entry_safe(wdata, tmp, &wdata_list, list) { | |
2395 | if (!rc) { | |
2396 | /* FIXME: freezable too? */ | |
2397 | rc = wait_for_completion_killable(&wdata->done); | |
2398 | if (rc) | |
2399 | rc = -EINTR; | |
2400 | else if (wdata->result) | |
2401 | rc = wdata->result; | |
2402 | else | |
2403 | total_written += wdata->bytes; | |
2404 | ||
2405 | /* resend call if it's a retryable error */ | |
2406 | if (rc == -EAGAIN) { | |
2407 | rc = cifs_uncached_retry_writev(wdata); | |
2408 | goto restart_loop; | |
2409 | } | |
2410 | } | |
2411 | list_del_init(&wdata->list); | |
2412 | kref_put(&wdata->refcount, cifs_writedata_release); | |
72432ffc PS |
2413 | } |
2414 | ||
da82f7e7 JL |
2415 | if (total_written > 0) |
2416 | *poffset += total_written; | |
72432ffc | 2417 | |
da82f7e7 JL |
2418 | cifs_stats_bytes_written(tcon, total_written); |
2419 | return total_written ? total_written : (ssize_t)rc; | |
72432ffc PS |
2420 | } |
2421 | ||
0b81c1c4 | 2422 | ssize_t cifs_user_writev(struct kiocb *iocb, const struct iovec *iov, |
72432ffc PS |
2423 | unsigned long nr_segs, loff_t pos) |
2424 | { | |
2425 | ssize_t written; | |
2426 | struct inode *inode; | |
2427 | ||
2428 | inode = iocb->ki_filp->f_path.dentry->d_inode; | |
2429 | ||
2430 | /* | |
2431 | * BB - optimize the way when signing is disabled. We can drop this | |
2432 | * extra memory-to-memory copying and use iovec buffers for constructing | |
2433 | * write request. | |
2434 | */ | |
2435 | ||
2436 | written = cifs_iovec_write(iocb->ki_filp, iov, nr_segs, &pos); | |
2437 | if (written > 0) { | |
2438 | CIFS_I(inode)->invalid_mapping = true; | |
2439 | iocb->ki_pos = pos; | |
2440 | } | |
2441 | ||
2442 | return written; | |
2443 | } | |
2444 | ||
579f9053 PS |
2445 | static ssize_t |
2446 | cifs_writev(struct kiocb *iocb, const struct iovec *iov, | |
2447 | unsigned long nr_segs, loff_t pos) | |
72432ffc | 2448 | { |
579f9053 PS |
2449 | struct file *file = iocb->ki_filp; |
2450 | struct cifsFileInfo *cfile = (struct cifsFileInfo *)file->private_data; | |
2451 | struct inode *inode = file->f_mapping->host; | |
2452 | struct cifsInodeInfo *cinode = CIFS_I(inode); | |
2453 | struct TCP_Server_Info *server = tlink_tcon(cfile->tlink)->ses->server; | |
2454 | ssize_t rc = -EACCES; | |
72432ffc | 2455 | |
579f9053 | 2456 | BUG_ON(iocb->ki_pos != pos); |
72432ffc | 2457 | |
579f9053 PS |
2458 | sb_start_write(inode->i_sb); |
2459 | ||
2460 | /* | |
2461 | * We need to hold the sem to be sure nobody modifies lock list | |
2462 | * with a brlock that prevents writing. | |
2463 | */ | |
2464 | down_read(&cinode->lock_sem); | |
2465 | if (!cifs_find_lock_conflict(cfile, pos, iov_length(iov, nr_segs), | |
2466 | server->vals->exclusive_lock_type, NULL, | |
2467 | true)) { | |
2468 | mutex_lock(&inode->i_mutex); | |
2469 | rc = __generic_file_aio_write(iocb, iov, nr_segs, | |
2470 | &iocb->ki_pos); | |
2471 | mutex_unlock(&inode->i_mutex); | |
2472 | } | |
2473 | ||
2474 | if (rc > 0 || rc == -EIOCBQUEUED) { | |
2475 | ssize_t err; | |
2476 | ||
2477 | err = generic_write_sync(file, pos, rc); | |
2478 | if (err < 0 && rc > 0) | |
2479 | rc = err; | |
2480 | } | |
2481 | ||
2482 | up_read(&cinode->lock_sem); | |
2483 | sb_end_write(inode->i_sb); | |
2484 | return rc; | |
2485 | } | |
2486 | ||
2487 | ssize_t | |
2488 | cifs_strict_writev(struct kiocb *iocb, const struct iovec *iov, | |
2489 | unsigned long nr_segs, loff_t pos) | |
2490 | { | |
2491 | struct inode *inode = iocb->ki_filp->f_path.dentry->d_inode; | |
2492 | struct cifsInodeInfo *cinode = CIFS_I(inode); | |
2493 | struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb); | |
2494 | struct cifsFileInfo *cfile = (struct cifsFileInfo *) | |
2495 | iocb->ki_filp->private_data; | |
2496 | struct cifs_tcon *tcon = tlink_tcon(cfile->tlink); | |
72432ffc | 2497 | |
25078105 | 2498 | #ifdef CONFIG_CIFS_SMB2 |
72432ffc | 2499 | /* |
25078105 PS |
2500 | * If we have an oplock for read and want to write a data to the file |
2501 | * we need to store it in the page cache and then push it to the server | |
2502 | * to be sure the next read will get a valid data. | |
2503 | */ | |
2504 | if (!cinode->clientCanCacheAll && cinode->clientCanCacheRead) { | |
2505 | ssize_t written; | |
2506 | int rc; | |
2507 | ||
2508 | written = generic_file_aio_write(iocb, iov, nr_segs, pos); | |
2509 | rc = filemap_fdatawrite(inode->i_mapping); | |
2510 | if (rc) | |
2511 | return (ssize_t)rc; | |
2512 | ||
2513 | return written; | |
2514 | } | |
2515 | #endif | |
2516 | ||
2517 | /* | |
2518 | * For non-oplocked files in strict cache mode we need to write the data | |
2519 | * to the server exactly from the pos to pos+len-1 rather than flush all | |
2520 | * affected pages because it may cause a error with mandatory locks on | |
2521 | * these pages but not on the region from pos to ppos+len-1. | |
72432ffc PS |
2522 | */ |
2523 | ||
579f9053 PS |
2524 | if (!cinode->clientCanCacheAll) |
2525 | return cifs_user_writev(iocb, iov, nr_segs, pos); | |
2526 | ||
2527 | if (cap_unix(tcon->ses) && | |
2528 | (CIFS_UNIX_FCNTL_CAP & le64_to_cpu(tcon->fsUnixInfo.Capability)) && | |
2529 | ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NOPOSIXBRL) == 0)) | |
2530 | return generic_file_aio_write(iocb, iov, nr_segs, pos); | |
2531 | ||
2532 | return cifs_writev(iocb, iov, nr_segs, pos); | |
72432ffc PS |
2533 | } |
2534 | ||
0471ca3f | 2535 | static struct cifs_readdata * |
f4e49cd2 | 2536 | cifs_readdata_alloc(unsigned int nr_pages, work_func_t complete) |
0471ca3f JL |
2537 | { |
2538 | struct cifs_readdata *rdata; | |
f4e49cd2 | 2539 | |
c5fab6f4 JL |
2540 | rdata = kzalloc(sizeof(*rdata) + (sizeof(struct page *) * nr_pages), |
2541 | GFP_KERNEL); | |
0471ca3f | 2542 | if (rdata != NULL) { |
6993f74a | 2543 | kref_init(&rdata->refcount); |
1c892549 JL |
2544 | INIT_LIST_HEAD(&rdata->list); |
2545 | init_completion(&rdata->done); | |
0471ca3f | 2546 | INIT_WORK(&rdata->work, complete); |
0471ca3f | 2547 | } |
f4e49cd2 | 2548 | |
0471ca3f JL |
2549 | return rdata; |
2550 | } | |
2551 | ||
6993f74a JL |
2552 | void |
2553 | cifs_readdata_release(struct kref *refcount) | |
0471ca3f | 2554 | { |
6993f74a JL |
2555 | struct cifs_readdata *rdata = container_of(refcount, |
2556 | struct cifs_readdata, refcount); | |
2557 | ||
2558 | if (rdata->cfile) | |
2559 | cifsFileInfo_put(rdata->cfile); | |
2560 | ||
0471ca3f JL |
2561 | kfree(rdata); |
2562 | } | |
2563 | ||
1c892549 | 2564 | static int |
c5fab6f4 | 2565 | cifs_read_allocate_pages(struct cifs_readdata *rdata, unsigned int nr_pages) |
1c892549 JL |
2566 | { |
2567 | int rc = 0; | |
c5fab6f4 | 2568 | struct page *page; |
1c892549 JL |
2569 | unsigned int i; |
2570 | ||
c5fab6f4 | 2571 | for (i = 0; i < nr_pages; i++) { |
1c892549 JL |
2572 | page = alloc_page(GFP_KERNEL|__GFP_HIGHMEM); |
2573 | if (!page) { | |
2574 | rc = -ENOMEM; | |
2575 | break; | |
2576 | } | |
c5fab6f4 | 2577 | rdata->pages[i] = page; |
1c892549 JL |
2578 | } |
2579 | ||
2580 | if (rc) { | |
c5fab6f4 JL |
2581 | for (i = 0; i < nr_pages; i++) { |
2582 | put_page(rdata->pages[i]); | |
2583 | rdata->pages[i] = NULL; | |
1c892549 JL |
2584 | } |
2585 | } | |
2586 | return rc; | |
2587 | } | |
2588 | ||
2589 | static void | |
2590 | cifs_uncached_readdata_release(struct kref *refcount) | |
2591 | { | |
1c892549 JL |
2592 | struct cifs_readdata *rdata = container_of(refcount, |
2593 | struct cifs_readdata, refcount); | |
c5fab6f4 | 2594 | unsigned int i; |
1c892549 | 2595 | |
c5fab6f4 JL |
2596 | for (i = 0; i < rdata->nr_pages; i++) { |
2597 | put_page(rdata->pages[i]); | |
2598 | rdata->pages[i] = NULL; | |
1c892549 JL |
2599 | } |
2600 | cifs_readdata_release(refcount); | |
2601 | } | |
2602 | ||
2a1bb138 JL |
2603 | static int |
2604 | cifs_retry_async_readv(struct cifs_readdata *rdata) | |
2605 | { | |
2606 | int rc; | |
fc9c5966 PS |
2607 | struct TCP_Server_Info *server; |
2608 | ||
2609 | server = tlink_tcon(rdata->cfile->tlink)->ses->server; | |
2a1bb138 JL |
2610 | |
2611 | do { | |
2612 | if (rdata->cfile->invalidHandle) { | |
2613 | rc = cifs_reopen_file(rdata->cfile, true); | |
2614 | if (rc != 0) | |
2615 | continue; | |
2616 | } | |
fc9c5966 | 2617 | rc = server->ops->async_readv(rdata); |
2a1bb138 JL |
2618 | } while (rc == -EAGAIN); |
2619 | ||
2620 | return rc; | |
2621 | } | |
2622 | ||
1c892549 JL |
2623 | /** |
2624 | * cifs_readdata_to_iov - copy data from pages in response to an iovec | |
2625 | * @rdata: the readdata response with list of pages holding data | |
2626 | * @iov: vector in which we should copy the data | |
2627 | * @nr_segs: number of segments in vector | |
2628 | * @offset: offset into file of the first iovec | |
2629 | * @copied: used to return the amount of data copied to the iov | |
2630 | * | |
2631 | * This function copies data from a list of pages in a readdata response into | |
2632 | * an array of iovecs. It will first calculate where the data should go | |
2633 | * based on the info in the readdata and then copy the data into that spot. | |
2634 | */ | |
2635 | static ssize_t | |
2636 | cifs_readdata_to_iov(struct cifs_readdata *rdata, const struct iovec *iov, | |
2637 | unsigned long nr_segs, loff_t offset, ssize_t *copied) | |
2638 | { | |
2639 | int rc = 0; | |
2640 | struct iov_iter ii; | |
2641 | size_t pos = rdata->offset - offset; | |
1c892549 JL |
2642 | ssize_t remaining = rdata->bytes; |
2643 | unsigned char *pdata; | |
c5fab6f4 | 2644 | unsigned int i; |
1c892549 JL |
2645 | |
2646 | /* set up iov_iter and advance to the correct offset */ | |
2647 | iov_iter_init(&ii, iov, nr_segs, iov_length(iov, nr_segs), 0); | |
2648 | iov_iter_advance(&ii, pos); | |
2649 | ||
2650 | *copied = 0; | |
c5fab6f4 | 2651 | for (i = 0; i < rdata->nr_pages; i++) { |
1c892549 | 2652 | ssize_t copy; |
c5fab6f4 | 2653 | struct page *page = rdata->pages[i]; |
1c892549 JL |
2654 | |
2655 | /* copy a whole page or whatever's left */ | |
2656 | copy = min_t(ssize_t, remaining, PAGE_SIZE); | |
2657 | ||
2658 | /* ...but limit it to whatever space is left in the iov */ | |
2659 | copy = min_t(ssize_t, copy, iov_iter_count(&ii)); | |
2660 | ||
2661 | /* go while there's data to be copied and no errors */ | |
2662 | if (copy && !rc) { | |
2663 | pdata = kmap(page); | |
2664 | rc = memcpy_toiovecend(ii.iov, pdata, ii.iov_offset, | |
2665 | (int)copy); | |
2666 | kunmap(page); | |
2667 | if (!rc) { | |
2668 | *copied += copy; | |
2669 | remaining -= copy; | |
2670 | iov_iter_advance(&ii, copy); | |
2671 | } | |
2672 | } | |
1c892549 JL |
2673 | } |
2674 | ||
2675 | return rc; | |
2676 | } | |
2677 | ||
2678 | static void | |
2679 | cifs_uncached_readv_complete(struct work_struct *work) | |
2680 | { | |
2681 | struct cifs_readdata *rdata = container_of(work, | |
2682 | struct cifs_readdata, work); | |
1c892549 JL |
2683 | |
2684 | complete(&rdata->done); | |
2685 | kref_put(&rdata->refcount, cifs_uncached_readdata_release); | |
2686 | } | |
2687 | ||
2688 | static int | |
8321fec4 JL |
2689 | cifs_uncached_read_into_pages(struct TCP_Server_Info *server, |
2690 | struct cifs_readdata *rdata, unsigned int len) | |
1c892549 | 2691 | { |
8321fec4 | 2692 | int total_read = 0, result = 0; |
c5fab6f4 JL |
2693 | unsigned int i; |
2694 | unsigned int nr_pages = rdata->nr_pages; | |
8321fec4 | 2695 | struct kvec iov; |
1c892549 | 2696 | |
8321fec4 | 2697 | rdata->tailsz = PAGE_SIZE; |
c5fab6f4 JL |
2698 | for (i = 0; i < nr_pages; i++) { |
2699 | struct page *page = rdata->pages[i]; | |
2700 | ||
8321fec4 | 2701 | if (len >= PAGE_SIZE) { |
1c892549 | 2702 | /* enough data to fill the page */ |
8321fec4 JL |
2703 | iov.iov_base = kmap(page); |
2704 | iov.iov_len = PAGE_SIZE; | |
2705 | cFYI(1, "%u: iov_base=%p iov_len=%zu", | |
2706 | i, iov.iov_base, iov.iov_len); | |
2707 | len -= PAGE_SIZE; | |
2708 | } else if (len > 0) { | |
1c892549 | 2709 | /* enough for partial page, fill and zero the rest */ |
8321fec4 JL |
2710 | iov.iov_base = kmap(page); |
2711 | iov.iov_len = len; | |
2712 | cFYI(1, "%u: iov_base=%p iov_len=%zu", | |
2713 | i, iov.iov_base, iov.iov_len); | |
2714 | memset(iov.iov_base + len, '\0', PAGE_SIZE - len); | |
2715 | rdata->tailsz = len; | |
2716 | len = 0; | |
1c892549 JL |
2717 | } else { |
2718 | /* no need to hold page hostage */ | |
c5fab6f4 JL |
2719 | rdata->pages[i] = NULL; |
2720 | rdata->nr_pages--; | |
1c892549 | 2721 | put_page(page); |
8321fec4 | 2722 | continue; |
1c892549 | 2723 | } |
8321fec4 JL |
2724 | |
2725 | result = cifs_readv_from_socket(server, &iov, 1, iov.iov_len); | |
2726 | kunmap(page); | |
2727 | if (result < 0) | |
2728 | break; | |
2729 | ||
2730 | total_read += result; | |
1c892549 JL |
2731 | } |
2732 | ||
8321fec4 | 2733 | return total_read > 0 ? total_read : result; |
1c892549 JL |
2734 | } |
2735 | ||
a70307ee PS |
2736 | static ssize_t |
2737 | cifs_iovec_read(struct file *file, const struct iovec *iov, | |
2738 | unsigned long nr_segs, loff_t *poffset) | |
1da177e4 | 2739 | { |
1c892549 | 2740 | ssize_t rc; |
a70307ee | 2741 | size_t len, cur_len; |
1c892549 JL |
2742 | ssize_t total_read = 0; |
2743 | loff_t offset = *poffset; | |
2744 | unsigned int npages; | |
1da177e4 | 2745 | struct cifs_sb_info *cifs_sb; |
1c892549 | 2746 | struct cifs_tcon *tcon; |
1da177e4 | 2747 | struct cifsFileInfo *open_file; |
1c892549 JL |
2748 | struct cifs_readdata *rdata, *tmp; |
2749 | struct list_head rdata_list; | |
2750 | pid_t pid; | |
a70307ee PS |
2751 | |
2752 | if (!nr_segs) | |
2753 | return 0; | |
2754 | ||
2755 | len = iov_length(iov, nr_segs); | |
2756 | if (!len) | |
2757 | return 0; | |
1da177e4 | 2758 | |
1c892549 | 2759 | INIT_LIST_HEAD(&rdata_list); |
e6a00296 | 2760 | cifs_sb = CIFS_SB(file->f_path.dentry->d_sb); |
c21dfb69 | 2761 | open_file = file->private_data; |
1c892549 | 2762 | tcon = tlink_tcon(open_file->tlink); |
1da177e4 | 2763 | |
fc9c5966 PS |
2764 | if (!tcon->ses->server->ops->async_readv) |
2765 | return -ENOSYS; | |
2766 | ||
d4ffff1f PS |
2767 | if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_RWPIDFORWARD) |
2768 | pid = open_file->pid; | |
2769 | else | |
2770 | pid = current->tgid; | |
2771 | ||
ad7a2926 | 2772 | if ((file->f_flags & O_ACCMODE) == O_WRONLY) |
b6b38f70 | 2773 | cFYI(1, "attempting read on write only file instance"); |
ad7a2926 | 2774 | |
1c892549 JL |
2775 | do { |
2776 | cur_len = min_t(const size_t, len - total_read, cifs_sb->rsize); | |
2777 | npages = DIV_ROUND_UP(cur_len, PAGE_SIZE); | |
a70307ee | 2778 | |
1c892549 JL |
2779 | /* allocate a readdata struct */ |
2780 | rdata = cifs_readdata_alloc(npages, | |
2781 | cifs_uncached_readv_complete); | |
2782 | if (!rdata) { | |
2783 | rc = -ENOMEM; | |
2784 | goto error; | |
1da177e4 | 2785 | } |
a70307ee | 2786 | |
c5fab6f4 | 2787 | rc = cifs_read_allocate_pages(rdata, npages); |
1c892549 JL |
2788 | if (rc) |
2789 | goto error; | |
2790 | ||
2791 | rdata->cfile = cifsFileInfo_get(open_file); | |
c5fab6f4 | 2792 | rdata->nr_pages = npages; |
1c892549 JL |
2793 | rdata->offset = offset; |
2794 | rdata->bytes = cur_len; | |
2795 | rdata->pid = pid; | |
8321fec4 JL |
2796 | rdata->pagesz = PAGE_SIZE; |
2797 | rdata->read_into_pages = cifs_uncached_read_into_pages; | |
1c892549 JL |
2798 | |
2799 | rc = cifs_retry_async_readv(rdata); | |
2800 | error: | |
2801 | if (rc) { | |
2802 | kref_put(&rdata->refcount, | |
2803 | cifs_uncached_readdata_release); | |
2804 | break; | |
2805 | } | |
2806 | ||
2807 | list_add_tail(&rdata->list, &rdata_list); | |
2808 | offset += cur_len; | |
2809 | len -= cur_len; | |
2810 | } while (len > 0); | |
2811 | ||
2812 | /* if at least one read request send succeeded, then reset rc */ | |
2813 | if (!list_empty(&rdata_list)) | |
2814 | rc = 0; | |
2815 | ||
2816 | /* the loop below should proceed in the order of increasing offsets */ | |
2817 | restart_loop: | |
2818 | list_for_each_entry_safe(rdata, tmp, &rdata_list, list) { | |
2819 | if (!rc) { | |
2820 | ssize_t copied; | |
2821 | ||
2822 | /* FIXME: freezable sleep too? */ | |
2823 | rc = wait_for_completion_killable(&rdata->done); | |
2824 | if (rc) | |
2825 | rc = -EINTR; | |
2826 | else if (rdata->result) | |
2827 | rc = rdata->result; | |
2828 | else { | |
2829 | rc = cifs_readdata_to_iov(rdata, iov, | |
2830 | nr_segs, *poffset, | |
2831 | &copied); | |
2832 | total_read += copied; | |
2833 | } | |
2834 | ||
2835 | /* resend call if it's a retryable error */ | |
2836 | if (rc == -EAGAIN) { | |
2837 | rc = cifs_retry_async_readv(rdata); | |
2838 | goto restart_loop; | |
1da177e4 | 2839 | } |
1da177e4 | 2840 | } |
1c892549 JL |
2841 | list_del_init(&rdata->list); |
2842 | kref_put(&rdata->refcount, cifs_uncached_readdata_release); | |
1da177e4 | 2843 | } |
a70307ee | 2844 | |
1c892549 JL |
2845 | cifs_stats_bytes_read(tcon, total_read); |
2846 | *poffset += total_read; | |
2847 | ||
09a4707e PS |
2848 | /* mask nodata case */ |
2849 | if (rc == -ENODATA) | |
2850 | rc = 0; | |
2851 | ||
1c892549 | 2852 | return total_read ? total_read : rc; |
1da177e4 LT |
2853 | } |
2854 | ||
0b81c1c4 | 2855 | ssize_t cifs_user_readv(struct kiocb *iocb, const struct iovec *iov, |
a70307ee PS |
2856 | unsigned long nr_segs, loff_t pos) |
2857 | { | |
2858 | ssize_t read; | |
2859 | ||
2860 | read = cifs_iovec_read(iocb->ki_filp, iov, nr_segs, &pos); | |
2861 | if (read > 0) | |
2862 | iocb->ki_pos = pos; | |
2863 | ||
2864 | return read; | |
2865 | } | |
2866 | ||
579f9053 PS |
2867 | ssize_t |
2868 | cifs_strict_readv(struct kiocb *iocb, const struct iovec *iov, | |
2869 | unsigned long nr_segs, loff_t pos) | |
a70307ee | 2870 | { |
579f9053 PS |
2871 | struct inode *inode = iocb->ki_filp->f_path.dentry->d_inode; |
2872 | struct cifsInodeInfo *cinode = CIFS_I(inode); | |
2873 | struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb); | |
2874 | struct cifsFileInfo *cfile = (struct cifsFileInfo *) | |
2875 | iocb->ki_filp->private_data; | |
2876 | struct cifs_tcon *tcon = tlink_tcon(cfile->tlink); | |
2877 | int rc = -EACCES; | |
a70307ee PS |
2878 | |
2879 | /* | |
2880 | * In strict cache mode we need to read from the server all the time | |
2881 | * if we don't have level II oplock because the server can delay mtime | |
2882 | * change - so we can't make a decision about inode invalidating. | |
2883 | * And we can also fail with pagereading if there are mandatory locks | |
2884 | * on pages affected by this read but not on the region from pos to | |
2885 | * pos+len-1. | |
2886 | */ | |
579f9053 PS |
2887 | if (!cinode->clientCanCacheRead) |
2888 | return cifs_user_readv(iocb, iov, nr_segs, pos); | |
a70307ee | 2889 | |
579f9053 PS |
2890 | if (cap_unix(tcon->ses) && |
2891 | (CIFS_UNIX_FCNTL_CAP & le64_to_cpu(tcon->fsUnixInfo.Capability)) && | |
2892 | ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NOPOSIXBRL) == 0)) | |
2893 | return generic_file_aio_read(iocb, iov, nr_segs, pos); | |
2894 | ||
2895 | /* | |
2896 | * We need to hold the sem to be sure nobody modifies lock list | |
2897 | * with a brlock that prevents reading. | |
2898 | */ | |
2899 | down_read(&cinode->lock_sem); | |
2900 | if (!cifs_find_lock_conflict(cfile, pos, iov_length(iov, nr_segs), | |
2901 | tcon->ses->server->vals->shared_lock_type, | |
2902 | NULL, true)) | |
2903 | rc = generic_file_aio_read(iocb, iov, nr_segs, pos); | |
2904 | up_read(&cinode->lock_sem); | |
2905 | return rc; | |
a70307ee | 2906 | } |
1da177e4 | 2907 | |
f9c6e234 PS |
2908 | static ssize_t |
2909 | cifs_read(struct file *file, char *read_data, size_t read_size, loff_t *offset) | |
1da177e4 LT |
2910 | { |
2911 | int rc = -EACCES; | |
2912 | unsigned int bytes_read = 0; | |
2913 | unsigned int total_read; | |
2914 | unsigned int current_read_size; | |
5eba8ab3 | 2915 | unsigned int rsize; |
1da177e4 | 2916 | struct cifs_sb_info *cifs_sb; |
29e20f9c | 2917 | struct cifs_tcon *tcon; |
f9c6e234 | 2918 | struct TCP_Server_Info *server; |
6d5786a3 | 2919 | unsigned int xid; |
f9c6e234 | 2920 | char *cur_offset; |
1da177e4 | 2921 | struct cifsFileInfo *open_file; |
d4ffff1f | 2922 | struct cifs_io_parms io_parms; |
ec637e3f | 2923 | int buf_type = CIFS_NO_BUFFER; |
d4ffff1f | 2924 | __u32 pid; |
1da177e4 | 2925 | |
6d5786a3 | 2926 | xid = get_xid(); |
e6a00296 | 2927 | cifs_sb = CIFS_SB(file->f_path.dentry->d_sb); |
1da177e4 | 2928 | |
5eba8ab3 JL |
2929 | /* FIXME: set up handlers for larger reads and/or convert to async */ |
2930 | rsize = min_t(unsigned int, cifs_sb->rsize, CIFSMaxBufSize); | |
2931 | ||
1da177e4 | 2932 | if (file->private_data == NULL) { |
0f3bc09e | 2933 | rc = -EBADF; |
6d5786a3 | 2934 | free_xid(xid); |
0f3bc09e | 2935 | return rc; |
1da177e4 | 2936 | } |
c21dfb69 | 2937 | open_file = file->private_data; |
29e20f9c | 2938 | tcon = tlink_tcon(open_file->tlink); |
f9c6e234 PS |
2939 | server = tcon->ses->server; |
2940 | ||
2941 | if (!server->ops->sync_read) { | |
2942 | free_xid(xid); | |
2943 | return -ENOSYS; | |
2944 | } | |
1da177e4 | 2945 | |
d4ffff1f PS |
2946 | if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_RWPIDFORWARD) |
2947 | pid = open_file->pid; | |
2948 | else | |
2949 | pid = current->tgid; | |
2950 | ||
1da177e4 | 2951 | if ((file->f_flags & O_ACCMODE) == O_WRONLY) |
b6b38f70 | 2952 | cFYI(1, "attempting read on write only file instance"); |
1da177e4 | 2953 | |
f9c6e234 PS |
2954 | for (total_read = 0, cur_offset = read_data; read_size > total_read; |
2955 | total_read += bytes_read, cur_offset += bytes_read) { | |
5eba8ab3 | 2956 | current_read_size = min_t(uint, read_size - total_read, rsize); |
29e20f9c PS |
2957 | /* |
2958 | * For windows me and 9x we do not want to request more than it | |
2959 | * negotiated since it will refuse the read then. | |
2960 | */ | |
2961 | if ((tcon->ses) && !(tcon->ses->capabilities & | |
2962 | tcon->ses->server->vals->cap_large_files)) { | |
7748dd6e | 2963 | current_read_size = min_t(uint, current_read_size, |
c974befa | 2964 | CIFSMaxBufSize); |
f9f5c817 | 2965 | } |
1da177e4 LT |
2966 | rc = -EAGAIN; |
2967 | while (rc == -EAGAIN) { | |
cdff08e7 | 2968 | if (open_file->invalidHandle) { |
15886177 | 2969 | rc = cifs_reopen_file(open_file, true); |
1da177e4 LT |
2970 | if (rc != 0) |
2971 | break; | |
2972 | } | |
d4ffff1f | 2973 | io_parms.pid = pid; |
29e20f9c | 2974 | io_parms.tcon = tcon; |
f9c6e234 | 2975 | io_parms.offset = *offset; |
d4ffff1f | 2976 | io_parms.length = current_read_size; |
f9c6e234 PS |
2977 | rc = server->ops->sync_read(xid, open_file, &io_parms, |
2978 | &bytes_read, &cur_offset, | |
2979 | &buf_type); | |
1da177e4 LT |
2980 | } |
2981 | if (rc || (bytes_read == 0)) { | |
2982 | if (total_read) { | |
2983 | break; | |
2984 | } else { | |
6d5786a3 | 2985 | free_xid(xid); |
1da177e4 LT |
2986 | return rc; |
2987 | } | |
2988 | } else { | |
29e20f9c | 2989 | cifs_stats_bytes_read(tcon, total_read); |
f9c6e234 | 2990 | *offset += bytes_read; |
1da177e4 LT |
2991 | } |
2992 | } | |
6d5786a3 | 2993 | free_xid(xid); |
1da177e4 LT |
2994 | return total_read; |
2995 | } | |
2996 | ||
ca83ce3d JL |
2997 | /* |
2998 | * If the page is mmap'ed into a process' page tables, then we need to make | |
2999 | * sure that it doesn't change while being written back. | |
3000 | */ | |
3001 | static int | |
3002 | cifs_page_mkwrite(struct vm_area_struct *vma, struct vm_fault *vmf) | |
3003 | { | |
3004 | struct page *page = vmf->page; | |
3005 | ||
3006 | lock_page(page); | |
3007 | return VM_FAULT_LOCKED; | |
3008 | } | |
3009 | ||
3010 | static struct vm_operations_struct cifs_file_vm_ops = { | |
3011 | .fault = filemap_fault, | |
3012 | .page_mkwrite = cifs_page_mkwrite, | |
0b173bc4 | 3013 | .remap_pages = generic_file_remap_pages, |
ca83ce3d JL |
3014 | }; |
3015 | ||
7a6a19b1 PS |
3016 | int cifs_file_strict_mmap(struct file *file, struct vm_area_struct *vma) |
3017 | { | |
3018 | int rc, xid; | |
3019 | struct inode *inode = file->f_path.dentry->d_inode; | |
3020 | ||
6d5786a3 | 3021 | xid = get_xid(); |
7a6a19b1 | 3022 | |
6feb9891 PS |
3023 | if (!CIFS_I(inode)->clientCanCacheRead) { |
3024 | rc = cifs_invalidate_mapping(inode); | |
3025 | if (rc) | |
3026 | return rc; | |
3027 | } | |
7a6a19b1 PS |
3028 | |
3029 | rc = generic_file_mmap(file, vma); | |
ca83ce3d JL |
3030 | if (rc == 0) |
3031 | vma->vm_ops = &cifs_file_vm_ops; | |
6d5786a3 | 3032 | free_xid(xid); |
7a6a19b1 PS |
3033 | return rc; |
3034 | } | |
3035 | ||
1da177e4 LT |
3036 | int cifs_file_mmap(struct file *file, struct vm_area_struct *vma) |
3037 | { | |
1da177e4 LT |
3038 | int rc, xid; |
3039 | ||
6d5786a3 | 3040 | xid = get_xid(); |
abab095d | 3041 | rc = cifs_revalidate_file(file); |
1da177e4 | 3042 | if (rc) { |
b6b38f70 | 3043 | cFYI(1, "Validation prior to mmap failed, error=%d", rc); |
6d5786a3 | 3044 | free_xid(xid); |
1da177e4 LT |
3045 | return rc; |
3046 | } | |
3047 | rc = generic_file_mmap(file, vma); | |
ca83ce3d JL |
3048 | if (rc == 0) |
3049 | vma->vm_ops = &cifs_file_vm_ops; | |
6d5786a3 | 3050 | free_xid(xid); |
1da177e4 LT |
3051 | return rc; |
3052 | } | |
3053 | ||
0471ca3f JL |
3054 | static void |
3055 | cifs_readv_complete(struct work_struct *work) | |
3056 | { | |
c5fab6f4 | 3057 | unsigned int i; |
0471ca3f JL |
3058 | struct cifs_readdata *rdata = container_of(work, |
3059 | struct cifs_readdata, work); | |
0471ca3f | 3060 | |
c5fab6f4 JL |
3061 | for (i = 0; i < rdata->nr_pages; i++) { |
3062 | struct page *page = rdata->pages[i]; | |
3063 | ||
0471ca3f JL |
3064 | lru_cache_add_file(page); |
3065 | ||
3066 | if (rdata->result == 0) { | |
0471ca3f JL |
3067 | flush_dcache_page(page); |
3068 | SetPageUptodate(page); | |
3069 | } | |
3070 | ||
3071 | unlock_page(page); | |
3072 | ||
3073 | if (rdata->result == 0) | |
3074 | cifs_readpage_to_fscache(rdata->mapping->host, page); | |
3075 | ||
3076 | page_cache_release(page); | |
c5fab6f4 | 3077 | rdata->pages[i] = NULL; |
0471ca3f | 3078 | } |
6993f74a | 3079 | kref_put(&rdata->refcount, cifs_readdata_release); |
0471ca3f JL |
3080 | } |
3081 | ||
8d5ce4d2 | 3082 | static int |
8321fec4 JL |
3083 | cifs_readpages_read_into_pages(struct TCP_Server_Info *server, |
3084 | struct cifs_readdata *rdata, unsigned int len) | |
8d5ce4d2 | 3085 | { |
8321fec4 | 3086 | int total_read = 0, result = 0; |
c5fab6f4 | 3087 | unsigned int i; |
8d5ce4d2 JL |
3088 | u64 eof; |
3089 | pgoff_t eof_index; | |
c5fab6f4 | 3090 | unsigned int nr_pages = rdata->nr_pages; |
8321fec4 | 3091 | struct kvec iov; |
8d5ce4d2 JL |
3092 | |
3093 | /* determine the eof that the server (probably) has */ | |
3094 | eof = CIFS_I(rdata->mapping->host)->server_eof; | |
3095 | eof_index = eof ? (eof - 1) >> PAGE_CACHE_SHIFT : 0; | |
3096 | cFYI(1, "eof=%llu eof_index=%lu", eof, eof_index); | |
3097 | ||
8321fec4 | 3098 | rdata->tailsz = PAGE_CACHE_SIZE; |
c5fab6f4 JL |
3099 | for (i = 0; i < nr_pages; i++) { |
3100 | struct page *page = rdata->pages[i]; | |
3101 | ||
8321fec4 | 3102 | if (len >= PAGE_CACHE_SIZE) { |
8d5ce4d2 | 3103 | /* enough data to fill the page */ |
8321fec4 JL |
3104 | iov.iov_base = kmap(page); |
3105 | iov.iov_len = PAGE_CACHE_SIZE; | |
8d5ce4d2 | 3106 | cFYI(1, "%u: idx=%lu iov_base=%p iov_len=%zu", |
8321fec4 JL |
3107 | i, page->index, iov.iov_base, iov.iov_len); |
3108 | len -= PAGE_CACHE_SIZE; | |
3109 | } else if (len > 0) { | |
8d5ce4d2 | 3110 | /* enough for partial page, fill and zero the rest */ |
8321fec4 JL |
3111 | iov.iov_base = kmap(page); |
3112 | iov.iov_len = len; | |
8d5ce4d2 | 3113 | cFYI(1, "%u: idx=%lu iov_base=%p iov_len=%zu", |
8321fec4 JL |
3114 | i, page->index, iov.iov_base, iov.iov_len); |
3115 | memset(iov.iov_base + len, | |
3116 | '\0', PAGE_CACHE_SIZE - len); | |
3117 | rdata->tailsz = len; | |
3118 | len = 0; | |
8d5ce4d2 JL |
3119 | } else if (page->index > eof_index) { |
3120 | /* | |
3121 | * The VFS will not try to do readahead past the | |
3122 | * i_size, but it's possible that we have outstanding | |
3123 | * writes with gaps in the middle and the i_size hasn't | |
3124 | * caught up yet. Populate those with zeroed out pages | |
3125 | * to prevent the VFS from repeatedly attempting to | |
3126 | * fill them until the writes are flushed. | |
3127 | */ | |
3128 | zero_user(page, 0, PAGE_CACHE_SIZE); | |
8d5ce4d2 JL |
3129 | lru_cache_add_file(page); |
3130 | flush_dcache_page(page); | |
3131 | SetPageUptodate(page); | |
3132 | unlock_page(page); | |
3133 | page_cache_release(page); | |
c5fab6f4 JL |
3134 | rdata->pages[i] = NULL; |
3135 | rdata->nr_pages--; | |
8321fec4 | 3136 | continue; |
8d5ce4d2 JL |
3137 | } else { |
3138 | /* no need to hold page hostage */ | |
8d5ce4d2 JL |
3139 | lru_cache_add_file(page); |
3140 | unlock_page(page); | |
3141 | page_cache_release(page); | |
c5fab6f4 JL |
3142 | rdata->pages[i] = NULL; |
3143 | rdata->nr_pages--; | |
8321fec4 | 3144 | continue; |
8d5ce4d2 | 3145 | } |
8321fec4 JL |
3146 | |
3147 | result = cifs_readv_from_socket(server, &iov, 1, iov.iov_len); | |
3148 | kunmap(page); | |
3149 | if (result < 0) | |
3150 | break; | |
3151 | ||
3152 | total_read += result; | |
8d5ce4d2 JL |
3153 | } |
3154 | ||
8321fec4 | 3155 | return total_read > 0 ? total_read : result; |
8d5ce4d2 JL |
3156 | } |
3157 | ||
1da177e4 LT |
3158 | static int cifs_readpages(struct file *file, struct address_space *mapping, |
3159 | struct list_head *page_list, unsigned num_pages) | |
3160 | { | |
690c5e31 JL |
3161 | int rc; |
3162 | struct list_head tmplist; | |
3163 | struct cifsFileInfo *open_file = file->private_data; | |
3164 | struct cifs_sb_info *cifs_sb = CIFS_SB(file->f_path.dentry->d_sb); | |
3165 | unsigned int rsize = cifs_sb->rsize; | |
3166 | pid_t pid; | |
1da177e4 | 3167 | |
690c5e31 JL |
3168 | /* |
3169 | * Give up immediately if rsize is too small to read an entire page. | |
3170 | * The VFS will fall back to readpage. We should never reach this | |
3171 | * point however since we set ra_pages to 0 when the rsize is smaller | |
3172 | * than a cache page. | |
3173 | */ | |
3174 | if (unlikely(rsize < PAGE_CACHE_SIZE)) | |
3175 | return 0; | |
bfa0d75a | 3176 | |
56698236 SJ |
3177 | /* |
3178 | * Reads as many pages as possible from fscache. Returns -ENOBUFS | |
3179 | * immediately if the cookie is negative | |
3180 | */ | |
3181 | rc = cifs_readpages_from_fscache(mapping->host, mapping, page_list, | |
3182 | &num_pages); | |
3183 | if (rc == 0) | |
690c5e31 | 3184 | return rc; |
56698236 | 3185 | |
d4ffff1f PS |
3186 | if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_RWPIDFORWARD) |
3187 | pid = open_file->pid; | |
3188 | else | |
3189 | pid = current->tgid; | |
3190 | ||
690c5e31 JL |
3191 | rc = 0; |
3192 | INIT_LIST_HEAD(&tmplist); | |
1da177e4 | 3193 | |
690c5e31 JL |
3194 | cFYI(1, "%s: file=%p mapping=%p num_pages=%u", __func__, file, |
3195 | mapping, num_pages); | |
3196 | ||
3197 | /* | |
3198 | * Start with the page at end of list and move it to private | |
3199 | * list. Do the same with any following pages until we hit | |
3200 | * the rsize limit, hit an index discontinuity, or run out of | |
3201 | * pages. Issue the async read and then start the loop again | |
3202 | * until the list is empty. | |
3203 | * | |
3204 | * Note that list order is important. The page_list is in | |
3205 | * the order of declining indexes. When we put the pages in | |
3206 | * the rdata->pages, then we want them in increasing order. | |
3207 | */ | |
3208 | while (!list_empty(page_list)) { | |
c5fab6f4 | 3209 | unsigned int i; |
690c5e31 JL |
3210 | unsigned int bytes = PAGE_CACHE_SIZE; |
3211 | unsigned int expected_index; | |
3212 | unsigned int nr_pages = 1; | |
3213 | loff_t offset; | |
3214 | struct page *page, *tpage; | |
3215 | struct cifs_readdata *rdata; | |
1da177e4 LT |
3216 | |
3217 | page = list_entry(page_list->prev, struct page, lru); | |
690c5e31 JL |
3218 | |
3219 | /* | |
3220 | * Lock the page and put it in the cache. Since no one else | |
3221 | * should have access to this page, we're safe to simply set | |
3222 | * PG_locked without checking it first. | |
3223 | */ | |
3224 | __set_page_locked(page); | |
3225 | rc = add_to_page_cache_locked(page, mapping, | |
3226 | page->index, GFP_KERNEL); | |
3227 | ||
3228 | /* give up if we can't stick it in the cache */ | |
3229 | if (rc) { | |
3230 | __clear_page_locked(page); | |
3231 | break; | |
3232 | } | |
3233 | ||
3234 | /* move first page to the tmplist */ | |
1da177e4 | 3235 | offset = (loff_t)page->index << PAGE_CACHE_SHIFT; |
690c5e31 | 3236 | list_move_tail(&page->lru, &tmplist); |
1da177e4 | 3237 | |
690c5e31 JL |
3238 | /* now try and add more pages onto the request */ |
3239 | expected_index = page->index + 1; | |
3240 | list_for_each_entry_safe_reverse(page, tpage, page_list, lru) { | |
3241 | /* discontinuity ? */ | |
3242 | if (page->index != expected_index) | |
fb8c4b14 | 3243 | break; |
690c5e31 JL |
3244 | |
3245 | /* would this page push the read over the rsize? */ | |
3246 | if (bytes + PAGE_CACHE_SIZE > rsize) | |
3247 | break; | |
3248 | ||
3249 | __set_page_locked(page); | |
3250 | if (add_to_page_cache_locked(page, mapping, | |
3251 | page->index, GFP_KERNEL)) { | |
3252 | __clear_page_locked(page); | |
3253 | break; | |
3254 | } | |
3255 | list_move_tail(&page->lru, &tmplist); | |
3256 | bytes += PAGE_CACHE_SIZE; | |
3257 | expected_index++; | |
3258 | nr_pages++; | |
1da177e4 | 3259 | } |
690c5e31 | 3260 | |
0471ca3f | 3261 | rdata = cifs_readdata_alloc(nr_pages, cifs_readv_complete); |
690c5e31 JL |
3262 | if (!rdata) { |
3263 | /* best to give up if we're out of mem */ | |
3264 | list_for_each_entry_safe(page, tpage, &tmplist, lru) { | |
3265 | list_del(&page->lru); | |
3266 | lru_cache_add_file(page); | |
3267 | unlock_page(page); | |
3268 | page_cache_release(page); | |
3269 | } | |
3270 | rc = -ENOMEM; | |
3271 | break; | |
3272 | } | |
3273 | ||
6993f74a | 3274 | rdata->cfile = cifsFileInfo_get(open_file); |
690c5e31 JL |
3275 | rdata->mapping = mapping; |
3276 | rdata->offset = offset; | |
3277 | rdata->bytes = bytes; | |
3278 | rdata->pid = pid; | |
8321fec4 JL |
3279 | rdata->pagesz = PAGE_CACHE_SIZE; |
3280 | rdata->read_into_pages = cifs_readpages_read_into_pages; | |
c5fab6f4 JL |
3281 | |
3282 | list_for_each_entry_safe(page, tpage, &tmplist, lru) { | |
3283 | list_del(&page->lru); | |
3284 | rdata->pages[rdata->nr_pages++] = page; | |
3285 | } | |
690c5e31 | 3286 | |
2a1bb138 | 3287 | rc = cifs_retry_async_readv(rdata); |
690c5e31 | 3288 | if (rc != 0) { |
c5fab6f4 JL |
3289 | for (i = 0; i < rdata->nr_pages; i++) { |
3290 | page = rdata->pages[i]; | |
690c5e31 JL |
3291 | lru_cache_add_file(page); |
3292 | unlock_page(page); | |
3293 | page_cache_release(page); | |
1da177e4 | 3294 | } |
6993f74a | 3295 | kref_put(&rdata->refcount, cifs_readdata_release); |
1da177e4 LT |
3296 | break; |
3297 | } | |
6993f74a JL |
3298 | |
3299 | kref_put(&rdata->refcount, cifs_readdata_release); | |
1da177e4 LT |
3300 | } |
3301 | ||
1da177e4 LT |
3302 | return rc; |
3303 | } | |
3304 | ||
3305 | static int cifs_readpage_worker(struct file *file, struct page *page, | |
3306 | loff_t *poffset) | |
3307 | { | |
3308 | char *read_data; | |
3309 | int rc; | |
3310 | ||
56698236 SJ |
3311 | /* Is the page cached? */ |
3312 | rc = cifs_readpage_from_fscache(file->f_path.dentry->d_inode, page); | |
3313 | if (rc == 0) | |
3314 | goto read_complete; | |
3315 | ||
1da177e4 LT |
3316 | page_cache_get(page); |
3317 | read_data = kmap(page); | |
3318 | /* for reads over a certain size could initiate async read ahead */ | |
fb8c4b14 | 3319 | |
1da177e4 | 3320 | rc = cifs_read(file, read_data, PAGE_CACHE_SIZE, poffset); |
fb8c4b14 | 3321 | |
1da177e4 LT |
3322 | if (rc < 0) |
3323 | goto io_error; | |
3324 | else | |
b6b38f70 | 3325 | cFYI(1, "Bytes read %d", rc); |
fb8c4b14 | 3326 | |
e6a00296 JJS |
3327 | file->f_path.dentry->d_inode->i_atime = |
3328 | current_fs_time(file->f_path.dentry->d_inode->i_sb); | |
fb8c4b14 | 3329 | |
1da177e4 LT |
3330 | if (PAGE_CACHE_SIZE > rc) |
3331 | memset(read_data + rc, 0, PAGE_CACHE_SIZE - rc); | |
3332 | ||
3333 | flush_dcache_page(page); | |
3334 | SetPageUptodate(page); | |
9dc06558 SJ |
3335 | |
3336 | /* send this page to the cache */ | |
3337 | cifs_readpage_to_fscache(file->f_path.dentry->d_inode, page); | |
3338 | ||
1da177e4 | 3339 | rc = 0; |
fb8c4b14 | 3340 | |
1da177e4 | 3341 | io_error: |
fb8c4b14 | 3342 | kunmap(page); |
1da177e4 | 3343 | page_cache_release(page); |
56698236 SJ |
3344 | |
3345 | read_complete: | |
1da177e4 LT |
3346 | return rc; |
3347 | } | |
3348 | ||
3349 | static int cifs_readpage(struct file *file, struct page *page) | |
3350 | { | |
3351 | loff_t offset = (loff_t)page->index << PAGE_CACHE_SHIFT; | |
3352 | int rc = -EACCES; | |
6d5786a3 | 3353 | unsigned int xid; |
1da177e4 | 3354 | |
6d5786a3 | 3355 | xid = get_xid(); |
1da177e4 LT |
3356 | |
3357 | if (file->private_data == NULL) { | |
0f3bc09e | 3358 | rc = -EBADF; |
6d5786a3 | 3359 | free_xid(xid); |
0f3bc09e | 3360 | return rc; |
1da177e4 LT |
3361 | } |
3362 | ||
ac3aa2f8 | 3363 | cFYI(1, "readpage %p at offset %d 0x%x", |
b6b38f70 | 3364 | page, (int)offset, (int)offset); |
1da177e4 LT |
3365 | |
3366 | rc = cifs_readpage_worker(file, page, &offset); | |
3367 | ||
3368 | unlock_page(page); | |
3369 | ||
6d5786a3 | 3370 | free_xid(xid); |
1da177e4 LT |
3371 | return rc; |
3372 | } | |
3373 | ||
a403a0a3 SF |
3374 | static int is_inode_writable(struct cifsInodeInfo *cifs_inode) |
3375 | { | |
3376 | struct cifsFileInfo *open_file; | |
3377 | ||
4477288a | 3378 | spin_lock(&cifs_file_list_lock); |
a403a0a3 | 3379 | list_for_each_entry(open_file, &cifs_inode->openFileList, flist) { |
2e396b83 | 3380 | if (OPEN_FMODE(open_file->f_flags) & FMODE_WRITE) { |
4477288a | 3381 | spin_unlock(&cifs_file_list_lock); |
a403a0a3 SF |
3382 | return 1; |
3383 | } | |
3384 | } | |
4477288a | 3385 | spin_unlock(&cifs_file_list_lock); |
a403a0a3 SF |
3386 | return 0; |
3387 | } | |
3388 | ||
1da177e4 LT |
3389 | /* We do not want to update the file size from server for inodes |
3390 | open for write - to avoid races with writepage extending | |
3391 | the file - in the future we could consider allowing | |
fb8c4b14 | 3392 | refreshing the inode only on increases in the file size |
1da177e4 LT |
3393 | but this is tricky to do without racing with writebehind |
3394 | page caching in the current Linux kernel design */ | |
4b18f2a9 | 3395 | bool is_size_safe_to_change(struct cifsInodeInfo *cifsInode, __u64 end_of_file) |
1da177e4 | 3396 | { |
a403a0a3 | 3397 | if (!cifsInode) |
4b18f2a9 | 3398 | return true; |
50c2f753 | 3399 | |
a403a0a3 SF |
3400 | if (is_inode_writable(cifsInode)) { |
3401 | /* This inode is open for write at least once */ | |
c32a0b68 SF |
3402 | struct cifs_sb_info *cifs_sb; |
3403 | ||
c32a0b68 | 3404 | cifs_sb = CIFS_SB(cifsInode->vfs_inode.i_sb); |
ad7a2926 | 3405 | if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DIRECT_IO) { |
fb8c4b14 | 3406 | /* since no page cache to corrupt on directio |
c32a0b68 | 3407 | we can change size safely */ |
4b18f2a9 | 3408 | return true; |
c32a0b68 SF |
3409 | } |
3410 | ||
fb8c4b14 | 3411 | if (i_size_read(&cifsInode->vfs_inode) < end_of_file) |
4b18f2a9 | 3412 | return true; |
7ba52631 | 3413 | |
4b18f2a9 | 3414 | return false; |
23e7dd7d | 3415 | } else |
4b18f2a9 | 3416 | return true; |
1da177e4 LT |
3417 | } |
3418 | ||
d9414774 NP |
3419 | static int cifs_write_begin(struct file *file, struct address_space *mapping, |
3420 | loff_t pos, unsigned len, unsigned flags, | |
3421 | struct page **pagep, void **fsdata) | |
1da177e4 | 3422 | { |
d9414774 NP |
3423 | pgoff_t index = pos >> PAGE_CACHE_SHIFT; |
3424 | loff_t offset = pos & (PAGE_CACHE_SIZE - 1); | |
a98ee8c1 JL |
3425 | loff_t page_start = pos & PAGE_MASK; |
3426 | loff_t i_size; | |
3427 | struct page *page; | |
3428 | int rc = 0; | |
d9414774 | 3429 | |
b6b38f70 | 3430 | cFYI(1, "write_begin from %lld len %d", (long long)pos, len); |
d9414774 | 3431 | |
54566b2c | 3432 | page = grab_cache_page_write_begin(mapping, index, flags); |
a98ee8c1 JL |
3433 | if (!page) { |
3434 | rc = -ENOMEM; | |
3435 | goto out; | |
3436 | } | |
8a236264 | 3437 | |
a98ee8c1 JL |
3438 | if (PageUptodate(page)) |
3439 | goto out; | |
8a236264 | 3440 | |
a98ee8c1 JL |
3441 | /* |
3442 | * If we write a full page it will be up to date, no need to read from | |
3443 | * the server. If the write is short, we'll end up doing a sync write | |
3444 | * instead. | |
3445 | */ | |
3446 | if (len == PAGE_CACHE_SIZE) | |
3447 | goto out; | |
8a236264 | 3448 | |
a98ee8c1 JL |
3449 | /* |
3450 | * optimize away the read when we have an oplock, and we're not | |
3451 | * expecting to use any of the data we'd be reading in. That | |
3452 | * is, when the page lies beyond the EOF, or straddles the EOF | |
3453 | * and the write will cover all of the existing data. | |
3454 | */ | |
3455 | if (CIFS_I(mapping->host)->clientCanCacheRead) { | |
3456 | i_size = i_size_read(mapping->host); | |
3457 | if (page_start >= i_size || | |
3458 | (offset == 0 && (pos + len) >= i_size)) { | |
3459 | zero_user_segments(page, 0, offset, | |
3460 | offset + len, | |
3461 | PAGE_CACHE_SIZE); | |
3462 | /* | |
3463 | * PageChecked means that the parts of the page | |
3464 | * to which we're not writing are considered up | |
3465 | * to date. Once the data is copied to the | |
3466 | * page, it can be set uptodate. | |
3467 | */ | |
3468 | SetPageChecked(page); | |
3469 | goto out; | |
3470 | } | |
3471 | } | |
d9414774 | 3472 | |
a98ee8c1 JL |
3473 | if ((file->f_flags & O_ACCMODE) != O_WRONLY) { |
3474 | /* | |
3475 | * might as well read a page, it is fast enough. If we get | |
3476 | * an error, we don't need to return it. cifs_write_end will | |
3477 | * do a sync write instead since PG_uptodate isn't set. | |
3478 | */ | |
3479 | cifs_readpage_worker(file, page, &page_start); | |
8a236264 SF |
3480 | } else { |
3481 | /* we could try using another file handle if there is one - | |
3482 | but how would we lock it to prevent close of that handle | |
3483 | racing with this read? In any case | |
d9414774 | 3484 | this will be written out by write_end so is fine */ |
1da177e4 | 3485 | } |
a98ee8c1 JL |
3486 | out: |
3487 | *pagep = page; | |
3488 | return rc; | |
1da177e4 LT |
3489 | } |
3490 | ||
85f2d6b4 SJ |
3491 | static int cifs_release_page(struct page *page, gfp_t gfp) |
3492 | { | |
3493 | if (PagePrivate(page)) | |
3494 | return 0; | |
3495 | ||
3496 | return cifs_fscache_release_page(page, gfp); | |
3497 | } | |
3498 | ||
3499 | static void cifs_invalidate_page(struct page *page, unsigned long offset) | |
3500 | { | |
3501 | struct cifsInodeInfo *cifsi = CIFS_I(page->mapping->host); | |
3502 | ||
3503 | if (offset == 0) | |
3504 | cifs_fscache_invalidate_page(page, &cifsi->vfs_inode); | |
3505 | } | |
3506 | ||
9ad1506b PS |
3507 | static int cifs_launder_page(struct page *page) |
3508 | { | |
3509 | int rc = 0; | |
3510 | loff_t range_start = page_offset(page); | |
3511 | loff_t range_end = range_start + (loff_t)(PAGE_CACHE_SIZE - 1); | |
3512 | struct writeback_control wbc = { | |
3513 | .sync_mode = WB_SYNC_ALL, | |
3514 | .nr_to_write = 0, | |
3515 | .range_start = range_start, | |
3516 | .range_end = range_end, | |
3517 | }; | |
3518 | ||
3519 | cFYI(1, "Launder page: %p", page); | |
3520 | ||
3521 | if (clear_page_dirty_for_io(page)) | |
3522 | rc = cifs_writepage_locked(page, &wbc); | |
3523 | ||
3524 | cifs_fscache_invalidate_page(page, page->mapping->host); | |
3525 | return rc; | |
3526 | } | |
3527 | ||
9b646972 | 3528 | void cifs_oplock_break(struct work_struct *work) |
3bc303c2 JL |
3529 | { |
3530 | struct cifsFileInfo *cfile = container_of(work, struct cifsFileInfo, | |
3531 | oplock_break); | |
a5e18bc3 | 3532 | struct inode *inode = cfile->dentry->d_inode; |
3bc303c2 | 3533 | struct cifsInodeInfo *cinode = CIFS_I(inode); |
95a3f2f3 | 3534 | struct cifs_tcon *tcon = tlink_tcon(cfile->tlink); |
eb4b756b | 3535 | int rc = 0; |
3bc303c2 JL |
3536 | |
3537 | if (inode && S_ISREG(inode->i_mode)) { | |
d54ff732 | 3538 | if (cinode->clientCanCacheRead) |
8737c930 | 3539 | break_lease(inode, O_RDONLY); |
d54ff732 | 3540 | else |
8737c930 | 3541 | break_lease(inode, O_WRONLY); |
3bc303c2 JL |
3542 | rc = filemap_fdatawrite(inode->i_mapping); |
3543 | if (cinode->clientCanCacheRead == 0) { | |
eb4b756b JL |
3544 | rc = filemap_fdatawait(inode->i_mapping); |
3545 | mapping_set_error(inode->i_mapping, rc); | |
3bc303c2 JL |
3546 | invalidate_remote_inode(inode); |
3547 | } | |
b6b38f70 | 3548 | cFYI(1, "Oplock flush inode %p rc %d", inode, rc); |
3bc303c2 JL |
3549 | } |
3550 | ||
85160e03 PS |
3551 | rc = cifs_push_locks(cfile); |
3552 | if (rc) | |
3553 | cERROR(1, "Push locks rc = %d", rc); | |
3554 | ||
3bc303c2 JL |
3555 | /* |
3556 | * releasing stale oplock after recent reconnect of smb session using | |
3557 | * a now incorrect file handle is not a data integrity issue but do | |
3558 | * not bother sending an oplock release if session to server still is | |
3559 | * disconnected since oplock already released by the server | |
3560 | */ | |
cdff08e7 | 3561 | if (!cfile->oplock_break_cancelled) { |
95a3f2f3 PS |
3562 | rc = tcon->ses->server->ops->oplock_response(tcon, &cfile->fid, |
3563 | cinode); | |
b6b38f70 | 3564 | cFYI(1, "Oplock release rc = %d", rc); |
3bc303c2 | 3565 | } |
3bc303c2 JL |
3566 | } |
3567 | ||
f5e54d6e | 3568 | const struct address_space_operations cifs_addr_ops = { |
1da177e4 LT |
3569 | .readpage = cifs_readpage, |
3570 | .readpages = cifs_readpages, | |
3571 | .writepage = cifs_writepage, | |
37c0eb46 | 3572 | .writepages = cifs_writepages, |
d9414774 NP |
3573 | .write_begin = cifs_write_begin, |
3574 | .write_end = cifs_write_end, | |
1da177e4 | 3575 | .set_page_dirty = __set_page_dirty_nobuffers, |
85f2d6b4 SJ |
3576 | .releasepage = cifs_release_page, |
3577 | .invalidatepage = cifs_invalidate_page, | |
9ad1506b | 3578 | .launder_page = cifs_launder_page, |
1da177e4 | 3579 | }; |
273d81d6 DK |
3580 | |
3581 | /* | |
3582 | * cifs_readpages requires the server to support a buffer large enough to | |
3583 | * contain the header plus one complete page of data. Otherwise, we need | |
3584 | * to leave cifs_readpages out of the address space operations. | |
3585 | */ | |
f5e54d6e | 3586 | const struct address_space_operations cifs_addr_ops_smallbuf = { |
273d81d6 DK |
3587 | .readpage = cifs_readpage, |
3588 | .writepage = cifs_writepage, | |
3589 | .writepages = cifs_writepages, | |
d9414774 NP |
3590 | .write_begin = cifs_write_begin, |
3591 | .write_end = cifs_write_end, | |
273d81d6 | 3592 | .set_page_dirty = __set_page_dirty_nobuffers, |
85f2d6b4 SJ |
3593 | .releasepage = cifs_release_page, |
3594 | .invalidatepage = cifs_invalidate_page, | |
9ad1506b | 3595 | .launder_page = cifs_launder_page, |
273d81d6 | 3596 | }; |