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Merge branch 'akpm' (fixes from Andrew)
[linux-2.6/cjktty.git] / fs / cifs / inode.c
blob20887bf63121286e3d52f582db922ec64f4a71e5
1 /*
2 * fs/cifs/inode.c
3 *
4 * Copyright (C) International Business Machines Corp., 2002,2010
5 * Author(s): Steve French (sfrench@us.ibm.com)
6 *
7 * This library is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU Lesser General Public License as published
9 * by the Free Software Foundation; either version 2.1 of the License, or
10 * (at your option) any later version.
11 *
12 * This library is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See
15 * the GNU Lesser General Public License for more details.
16 *
17 * You should have received a copy of the GNU Lesser General Public License
18 * along with this library; if not, write to the Free Software
19 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
20 */
21 #include <linux/fs.h>
22 #include <linux/stat.h>
23 #include <linux/slab.h>
24 #include <linux/pagemap.h>
25 #include <asm/div64.h>
26 #include "cifsfs.h"
27 #include "cifspdu.h"
28 #include "cifsglob.h"
29 #include "cifsproto.h"
30 #include "cifs_debug.h"
31 #include "cifs_fs_sb.h"
32 #include "fscache.h"
33
34
35 static void cifs_set_ops(struct inode *inode)
36 {
37 struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
38
39 switch (inode->i_mode & S_IFMT) {
40 case S_IFREG:
41 inode->i_op = &cifs_file_inode_ops;
42 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DIRECT_IO) {
43 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_BRL)
44 inode->i_fop = &cifs_file_direct_nobrl_ops;
45 else
46 inode->i_fop = &cifs_file_direct_ops;
47 } else if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_STRICT_IO) {
48 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_BRL)
49 inode->i_fop = &cifs_file_strict_nobrl_ops;
50 else
51 inode->i_fop = &cifs_file_strict_ops;
52 } else if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_BRL)
53 inode->i_fop = &cifs_file_nobrl_ops;
54 else { /* not direct, send byte range locks */
55 inode->i_fop = &cifs_file_ops;
56 }
57
58 /* check if server can support readpages */
59 if (cifs_sb_master_tcon(cifs_sb)->ses->server->maxBuf <
60 PAGE_CACHE_SIZE + MAX_CIFS_HDR_SIZE)
61 inode->i_data.a_ops = &cifs_addr_ops_smallbuf;
62 else
63 inode->i_data.a_ops = &cifs_addr_ops;
64 break;
65 case S_IFDIR:
66 #ifdef CONFIG_CIFS_DFS_UPCALL
67 if (IS_AUTOMOUNT(inode)) {
68 inode->i_op = &cifs_dfs_referral_inode_operations;
69 } else {
70 #else /* NO DFS support, treat as a directory */
71 {
72 #endif
73 inode->i_op = &cifs_dir_inode_ops;
74 inode->i_fop = &cifs_dir_ops;
75 }
76 break;
77 case S_IFLNK:
78 inode->i_op = &cifs_symlink_inode_ops;
79 break;
80 default:
81 init_special_inode(inode, inode->i_mode, inode->i_rdev);
82 break;
83 }
84 }
85
86 /* check inode attributes against fattr. If they don't match, tag the
87 * inode for cache invalidation
88 */
89 static void
90 cifs_revalidate_cache(struct inode *inode, struct cifs_fattr *fattr)
91 {
92 struct cifsInodeInfo *cifs_i = CIFS_I(inode);
93
94 cFYI(1, "%s: revalidating inode %llu", __func__, cifs_i->uniqueid);
95
96 if (inode->i_state & I_NEW) {
97 cFYI(1, "%s: inode %llu is new", __func__, cifs_i->uniqueid);
98 return;
99 }
100
101 /* don't bother with revalidation if we have an oplock */
102 if (cifs_i->clientCanCacheRead) {
103 cFYI(1, "%s: inode %llu is oplocked", __func__,
104 cifs_i->uniqueid);
105 return;
106 }
107
108 /* revalidate if mtime or size have changed */
109 if (timespec_equal(&inode->i_mtime, &fattr->cf_mtime) &&
110 cifs_i->server_eof == fattr->cf_eof) {
111 cFYI(1, "%s: inode %llu is unchanged", __func__,
112 cifs_i->uniqueid);
113 return;
114 }
115
116 cFYI(1, "%s: invalidating inode %llu mapping", __func__,
117 cifs_i->uniqueid);
118 cifs_i->invalid_mapping = true;
119 }
120
121 /* populate an inode with info from a cifs_fattr struct */
122 void
123 cifs_fattr_to_inode(struct inode *inode, struct cifs_fattr *fattr)
124 {
125 struct cifsInodeInfo *cifs_i = CIFS_I(inode);
126 struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
127
128 cifs_revalidate_cache(inode, fattr);
129
130 spin_lock(&inode->i_lock);
131 inode->i_atime = fattr->cf_atime;
132 inode->i_mtime = fattr->cf_mtime;
133 inode->i_ctime = fattr->cf_ctime;
134 inode->i_rdev = fattr->cf_rdev;
135 set_nlink(inode, fattr->cf_nlink);
136 inode->i_uid = fattr->cf_uid;
137 inode->i_gid = fattr->cf_gid;
138
139 /* if dynperm is set, don't clobber existing mode */
140 if (inode->i_state & I_NEW ||
141 !(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DYNPERM))
142 inode->i_mode = fattr->cf_mode;
143
144 cifs_i->cifsAttrs = fattr->cf_cifsattrs;
145
146 if (fattr->cf_flags & CIFS_FATTR_NEED_REVAL)
147 cifs_i->time = 0;
148 else
149 cifs_i->time = jiffies;
150
151 cifs_i->delete_pending = fattr->cf_flags & CIFS_FATTR_DELETE_PENDING;
152
153 cifs_i->server_eof = fattr->cf_eof;
154 /*
155 * Can't safely change the file size here if the client is writing to
156 * it due to potential races.
157 */
158 if (is_size_safe_to_change(cifs_i, fattr->cf_eof)) {
159 i_size_write(inode, fattr->cf_eof);
160
161 /*
162 * i_blocks is not related to (i_size / i_blksize),
163 * but instead 512 byte (2**9) size is required for
164 * calculating num blocks.
165 */
166 inode->i_blocks = (512 - 1 + fattr->cf_bytes) >> 9;
167 }
168 spin_unlock(&inode->i_lock);
169
170 if (fattr->cf_flags & CIFS_FATTR_DFS_REFERRAL)
171 inode->i_flags |= S_AUTOMOUNT;
172 cifs_set_ops(inode);
173 }
174
175 void
176 cifs_fill_uniqueid(struct super_block *sb, struct cifs_fattr *fattr)
177 {
178 struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
179
180 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM)
181 return;
182
183 fattr->cf_uniqueid = iunique(sb, ROOT_I);
184 }
185
186 /* Fill a cifs_fattr struct with info from FILE_UNIX_BASIC_INFO. */
187 void
188 cifs_unix_basic_to_fattr(struct cifs_fattr *fattr, FILE_UNIX_BASIC_INFO *info,
189 struct cifs_sb_info *cifs_sb)
190 {
191 memset(fattr, 0, sizeof(*fattr));
192 fattr->cf_uniqueid = le64_to_cpu(info->UniqueId);
193 fattr->cf_bytes = le64_to_cpu(info->NumOfBytes);
194 fattr->cf_eof = le64_to_cpu(info->EndOfFile);
195
196 fattr->cf_atime = cifs_NTtimeToUnix(info->LastAccessTime);
197 fattr->cf_mtime = cifs_NTtimeToUnix(info->LastModificationTime);
198 fattr->cf_ctime = cifs_NTtimeToUnix(info->LastStatusChange);
199 fattr->cf_mode = le64_to_cpu(info->Permissions);
200
201 /*
202 * Since we set the inode type below we need to mask off
203 * to avoid strange results if bits set above.
204 */
205 fattr->cf_mode &= ~S_IFMT;
206 switch (le32_to_cpu(info->Type)) {
207 case UNIX_FILE:
208 fattr->cf_mode |= S_IFREG;
209 fattr->cf_dtype = DT_REG;
210 break;
211 case UNIX_SYMLINK:
212 fattr->cf_mode |= S_IFLNK;
213 fattr->cf_dtype = DT_LNK;
214 break;
215 case UNIX_DIR:
216 fattr->cf_mode |= S_IFDIR;
217 fattr->cf_dtype = DT_DIR;
218 break;
219 case UNIX_CHARDEV:
220 fattr->cf_mode |= S_IFCHR;
221 fattr->cf_dtype = DT_CHR;
222 fattr->cf_rdev = MKDEV(le64_to_cpu(info->DevMajor),
223 le64_to_cpu(info->DevMinor) & MINORMASK);
224 break;
225 case UNIX_BLOCKDEV:
226 fattr->cf_mode |= S_IFBLK;
227 fattr->cf_dtype = DT_BLK;
228 fattr->cf_rdev = MKDEV(le64_to_cpu(info->DevMajor),
229 le64_to_cpu(info->DevMinor) & MINORMASK);
230 break;
231 case UNIX_FIFO:
232 fattr->cf_mode |= S_IFIFO;
233 fattr->cf_dtype = DT_FIFO;
234 break;
235 case UNIX_SOCKET:
236 fattr->cf_mode |= S_IFSOCK;
237 fattr->cf_dtype = DT_SOCK;
238 break;
239 default:
240 /* safest to call it a file if we do not know */
241 fattr->cf_mode |= S_IFREG;
242 fattr->cf_dtype = DT_REG;
243 cFYI(1, "unknown type %d", le32_to_cpu(info->Type));
244 break;
245 }
246
247 fattr->cf_uid = cifs_sb->mnt_uid;
248 if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_OVERR_UID)) {
249 u64 id = le64_to_cpu(info->Uid);
250 if (id < ((uid_t)-1)) {
251 kuid_t uid = make_kuid(&init_user_ns, id);
252 if (uid_valid(uid))
253 fattr->cf_uid = uid;
254 }
255 }
256
257 fattr->cf_gid = cifs_sb->mnt_gid;
258 if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_OVERR_GID)) {
259 u64 id = le64_to_cpu(info->Gid);
260 if (id < ((gid_t)-1)) {
261 kgid_t gid = make_kgid(&init_user_ns, id);
262 if (gid_valid(gid))
263 fattr->cf_gid = gid;
264 }
265 }
266
267 fattr->cf_nlink = le64_to_cpu(info->Nlinks);
268 }
269
270 /*
271 * Fill a cifs_fattr struct with fake inode info.
272 *
273 * Needed to setup cifs_fattr data for the directory which is the
274 * junction to the new submount (ie to setup the fake directory
275 * which represents a DFS referral).
276 */
277 static void
278 cifs_create_dfs_fattr(struct cifs_fattr *fattr, struct super_block *sb)
279 {
280 struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
281
282 cFYI(1, "creating fake fattr for DFS referral");
283
284 memset(fattr, 0, sizeof(*fattr));
285 fattr->cf_mode = S_IFDIR | S_IXUGO | S_IRWXU;
286 fattr->cf_uid = cifs_sb->mnt_uid;
287 fattr->cf_gid = cifs_sb->mnt_gid;
288 fattr->cf_atime = CURRENT_TIME;
289 fattr->cf_ctime = CURRENT_TIME;
290 fattr->cf_mtime = CURRENT_TIME;
291 fattr->cf_nlink = 2;
292 fattr->cf_flags |= CIFS_FATTR_DFS_REFERRAL;
293 }
294
295 static int
296 cifs_get_file_info_unix(struct file *filp)
297 {
298 int rc;
299 unsigned int xid;
300 FILE_UNIX_BASIC_INFO find_data;
301 struct cifs_fattr fattr;
302 struct inode *inode = file_inode(filp);
303 struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
304 struct cifsFileInfo *cfile = filp->private_data;
305 struct cifs_tcon *tcon = tlink_tcon(cfile->tlink);
306
307 xid = get_xid();
308 rc = CIFSSMBUnixQFileInfo(xid, tcon, cfile->fid.netfid, &find_data);
309 if (!rc) {
310 cifs_unix_basic_to_fattr(&fattr, &find_data, cifs_sb);
311 } else if (rc == -EREMOTE) {
312 cifs_create_dfs_fattr(&fattr, inode->i_sb);
313 rc = 0;
314 }
315
316 cifs_fattr_to_inode(inode, &fattr);
317 free_xid(xid);
318 return rc;
319 }
320
321 int cifs_get_inode_info_unix(struct inode **pinode,
322 const unsigned char *full_path,
323 struct super_block *sb, unsigned int xid)
324 {
325 int rc;
326 FILE_UNIX_BASIC_INFO find_data;
327 struct cifs_fattr fattr;
328 struct cifs_tcon *tcon;
329 struct tcon_link *tlink;
330 struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
331
332 cFYI(1, "Getting info on %s", full_path);
333
334 tlink = cifs_sb_tlink(cifs_sb);
335 if (IS_ERR(tlink))
336 return PTR_ERR(tlink);
337 tcon = tlink_tcon(tlink);
338
339 /* could have done a find first instead but this returns more info */
340 rc = CIFSSMBUnixQPathInfo(xid, tcon, full_path, &find_data,
341 cifs_sb->local_nls, cifs_sb->mnt_cifs_flags &
342 CIFS_MOUNT_MAP_SPECIAL_CHR);
343 cifs_put_tlink(tlink);
344
345 if (!rc) {
346 cifs_unix_basic_to_fattr(&fattr, &find_data, cifs_sb);
347 } else if (rc == -EREMOTE) {
348 cifs_create_dfs_fattr(&fattr, sb);
349 rc = 0;
350 } else {
351 return rc;
352 }
353
354 /* check for Minshall+French symlinks */
355 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MF_SYMLINKS) {
356 int tmprc = CIFSCheckMFSymlink(&fattr, full_path, cifs_sb, xid);
357 if (tmprc)
358 cFYI(1, "CIFSCheckMFSymlink: %d", tmprc);
359 }
360
361 if (*pinode == NULL) {
362 /* get new inode */
363 cifs_fill_uniqueid(sb, &fattr);
364 *pinode = cifs_iget(sb, &fattr);
365 if (!*pinode)
366 rc = -ENOMEM;
367 } else {
368 /* we already have inode, update it */
369 cifs_fattr_to_inode(*pinode, &fattr);
370 }
371
372 return rc;
373 }
374
375 static int
376 cifs_sfu_type(struct cifs_fattr *fattr, const unsigned char *path,
377 struct cifs_sb_info *cifs_sb, unsigned int xid)
378 {
379 int rc;
380 int oplock = 0;
381 __u16 netfid;
382 struct tcon_link *tlink;
383 struct cifs_tcon *tcon;
384 struct cifs_io_parms io_parms;
385 char buf[24];
386 unsigned int bytes_read;
387 char *pbuf;
388
389 pbuf = buf;
390
391 fattr->cf_mode &= ~S_IFMT;
392
393 if (fattr->cf_eof == 0) {
394 fattr->cf_mode |= S_IFIFO;
395 fattr->cf_dtype = DT_FIFO;
396 return 0;
397 } else if (fattr->cf_eof < 8) {
398 fattr->cf_mode |= S_IFREG;
399 fattr->cf_dtype = DT_REG;
400 return -EINVAL; /* EOPNOTSUPP? */
401 }
402
403 tlink = cifs_sb_tlink(cifs_sb);
404 if (IS_ERR(tlink))
405 return PTR_ERR(tlink);
406 tcon = tlink_tcon(tlink);
407
408 rc = CIFSSMBOpen(xid, tcon, path, FILE_OPEN, GENERIC_READ,
409 CREATE_NOT_DIR, &netfid, &oplock, NULL,
410 cifs_sb->local_nls,
411 cifs_sb->mnt_cifs_flags &
412 CIFS_MOUNT_MAP_SPECIAL_CHR);
413 if (rc == 0) {
414 int buf_type = CIFS_NO_BUFFER;
415 /* Read header */
416 io_parms.netfid = netfid;
417 io_parms.pid = current->tgid;
418 io_parms.tcon = tcon;
419 io_parms.offset = 0;
420 io_parms.length = 24;
421 rc = CIFSSMBRead(xid, &io_parms, &bytes_read, &pbuf,
422 &buf_type);
423 if ((rc == 0) && (bytes_read >= 8)) {
424 if (memcmp("IntxBLK", pbuf, 8) == 0) {
425 cFYI(1, "Block device");
426 fattr->cf_mode |= S_IFBLK;
427 fattr->cf_dtype = DT_BLK;
428 if (bytes_read == 24) {
429 /* we have enough to decode dev num */
430 __u64 mjr; /* major */
431 __u64 mnr; /* minor */
432 mjr = le64_to_cpu(*(__le64 *)(pbuf+8));
433 mnr = le64_to_cpu(*(__le64 *)(pbuf+16));
434 fattr->cf_rdev = MKDEV(mjr, mnr);
435 }
436 } else if (memcmp("IntxCHR", pbuf, 8) == 0) {
437 cFYI(1, "Char device");
438 fattr->cf_mode |= S_IFCHR;
439 fattr->cf_dtype = DT_CHR;
440 if (bytes_read == 24) {
441 /* we have enough to decode dev num */
442 __u64 mjr; /* major */
443 __u64 mnr; /* minor */
444 mjr = le64_to_cpu(*(__le64 *)(pbuf+8));
445 mnr = le64_to_cpu(*(__le64 *)(pbuf+16));
446 fattr->cf_rdev = MKDEV(mjr, mnr);
447 }
448 } else if (memcmp("IntxLNK", pbuf, 7) == 0) {
449 cFYI(1, "Symlink");
450 fattr->cf_mode |= S_IFLNK;
451 fattr->cf_dtype = DT_LNK;
452 } else {
453 fattr->cf_mode |= S_IFREG; /* file? */
454 fattr->cf_dtype = DT_REG;
455 rc = -EOPNOTSUPP;
456 }
457 } else {
458 fattr->cf_mode |= S_IFREG; /* then it is a file */
459 fattr->cf_dtype = DT_REG;
460 rc = -EOPNOTSUPP; /* or some unknown SFU type */
461 }
462 CIFSSMBClose(xid, tcon, netfid);
463 }
464 cifs_put_tlink(tlink);
465 return rc;
466 }
467
468 #define SFBITS_MASK (S_ISVTX | S_ISGID | S_ISUID) /* SETFILEBITS valid bits */
469
470 /*
471 * Fetch mode bits as provided by SFU.
472 *
473 * FIXME: Doesn't this clobber the type bit we got from cifs_sfu_type ?
474 */
475 static int cifs_sfu_mode(struct cifs_fattr *fattr, const unsigned char *path,
476 struct cifs_sb_info *cifs_sb, unsigned int xid)
477 {
478 #ifdef CONFIG_CIFS_XATTR
479 ssize_t rc;
480 char ea_value[4];
481 __u32 mode;
482 struct tcon_link *tlink;
483 struct cifs_tcon *tcon;
484
485 tlink = cifs_sb_tlink(cifs_sb);
486 if (IS_ERR(tlink))
487 return PTR_ERR(tlink);
488 tcon = tlink_tcon(tlink);
489
490 rc = CIFSSMBQAllEAs(xid, tcon, path, "SETFILEBITS",
491 ea_value, 4 /* size of buf */, cifs_sb->local_nls,
492 cifs_sb->mnt_cifs_flags &
493 CIFS_MOUNT_MAP_SPECIAL_CHR);
494 cifs_put_tlink(tlink);
495 if (rc < 0)
496 return (int)rc;
497 else if (rc > 3) {
498 mode = le32_to_cpu(*((__le32 *)ea_value));
499 fattr->cf_mode &= ~SFBITS_MASK;
500 cFYI(1, "special bits 0%o org mode 0%o", mode,
501 fattr->cf_mode);
502 fattr->cf_mode = (mode & SFBITS_MASK) | fattr->cf_mode;
503 cFYI(1, "special mode bits 0%o", mode);
504 }
505
506 return 0;
507 #else
508 return -EOPNOTSUPP;
509 #endif
510 }
511
512 /* Fill a cifs_fattr struct with info from FILE_ALL_INFO */
513 static void
514 cifs_all_info_to_fattr(struct cifs_fattr *fattr, FILE_ALL_INFO *info,
515 struct cifs_sb_info *cifs_sb, bool adjust_tz)
516 {
517 struct cifs_tcon *tcon = cifs_sb_master_tcon(cifs_sb);
518
519 memset(fattr, 0, sizeof(*fattr));
520 fattr->cf_cifsattrs = le32_to_cpu(info->Attributes);
521 if (info->DeletePending)
522 fattr->cf_flags |= CIFS_FATTR_DELETE_PENDING;
523
524 if (info->LastAccessTime)
525 fattr->cf_atime = cifs_NTtimeToUnix(info->LastAccessTime);
526 else
527 fattr->cf_atime = CURRENT_TIME;
528
529 fattr->cf_ctime = cifs_NTtimeToUnix(info->ChangeTime);
530 fattr->cf_mtime = cifs_NTtimeToUnix(info->LastWriteTime);
531
532 if (adjust_tz) {
533 fattr->cf_ctime.tv_sec += tcon->ses->server->timeAdj;
534 fattr->cf_mtime.tv_sec += tcon->ses->server->timeAdj;
535 }
536
537 fattr->cf_eof = le64_to_cpu(info->EndOfFile);
538 fattr->cf_bytes = le64_to_cpu(info->AllocationSize);
539 fattr->cf_createtime = le64_to_cpu(info->CreationTime);
540
541 if (fattr->cf_cifsattrs & ATTR_DIRECTORY) {
542 fattr->cf_mode = S_IFDIR | cifs_sb->mnt_dir_mode;
543 fattr->cf_dtype = DT_DIR;
544 /*
545 * Server can return wrong NumberOfLinks value for directories
546 * when Unix extensions are disabled - fake it.
547 */
548 fattr->cf_nlink = 2;
549 } else {
550 fattr->cf_mode = S_IFREG | cifs_sb->mnt_file_mode;
551 fattr->cf_dtype = DT_REG;
552
553 /* clear write bits if ATTR_READONLY is set */
554 if (fattr->cf_cifsattrs & ATTR_READONLY)
555 fattr->cf_mode &= ~(S_IWUGO);
556
557 fattr->cf_nlink = le32_to_cpu(info->NumberOfLinks);
558 }
559
560 fattr->cf_uid = cifs_sb->mnt_uid;
561 fattr->cf_gid = cifs_sb->mnt_gid;
562 }
563
564 static int
565 cifs_get_file_info(struct file *filp)
566 {
567 int rc;
568 unsigned int xid;
569 FILE_ALL_INFO find_data;
570 struct cifs_fattr fattr;
571 struct inode *inode = file_inode(filp);
572 struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
573 struct cifsFileInfo *cfile = filp->private_data;
574 struct cifs_tcon *tcon = tlink_tcon(cfile->tlink);
575 struct TCP_Server_Info *server = tcon->ses->server;
576
577 if (!server->ops->query_file_info)
578 return -ENOSYS;
579
580 xid = get_xid();
581 rc = server->ops->query_file_info(xid, tcon, &cfile->fid, &find_data);
582 switch (rc) {
583 case 0:
584 cifs_all_info_to_fattr(&fattr, &find_data, cifs_sb, false);
585 break;
586 case -EREMOTE:
587 cifs_create_dfs_fattr(&fattr, inode->i_sb);
588 rc = 0;
589 break;
590 case -EOPNOTSUPP:
591 case -EINVAL:
592 /*
593 * FIXME: legacy server -- fall back to path-based call?
594 * for now, just skip revalidating and mark inode for
595 * immediate reval.
596 */
597 rc = 0;
598 CIFS_I(inode)->time = 0;
599 default:
600 goto cgfi_exit;
601 }
602
603 /*
604 * don't bother with SFU junk here -- just mark inode as needing
605 * revalidation.
606 */
607 fattr.cf_uniqueid = CIFS_I(inode)->uniqueid;
608 fattr.cf_flags |= CIFS_FATTR_NEED_REVAL;
609 cifs_fattr_to_inode(inode, &fattr);
610 cgfi_exit:
611 free_xid(xid);
612 return rc;
613 }
614
615 int
616 cifs_get_inode_info(struct inode **inode, const char *full_path,
617 FILE_ALL_INFO *data, struct super_block *sb, int xid,
618 const __u16 *fid)
619 {
620 bool validinum = false;
621 __u16 srchflgs;
622 int rc = 0, tmprc = ENOSYS;
623 struct cifs_tcon *tcon;
624 struct TCP_Server_Info *server;
625 struct tcon_link *tlink;
626 struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
627 char *buf = NULL;
628 bool adjust_tz = false;
629 struct cifs_fattr fattr;
630 struct cifs_search_info *srchinf = NULL;
631
632 tlink = cifs_sb_tlink(cifs_sb);
633 if (IS_ERR(tlink))
634 return PTR_ERR(tlink);
635 tcon = tlink_tcon(tlink);
636 server = tcon->ses->server;
637
638 cFYI(1, "Getting info on %s", full_path);
639
640 if ((data == NULL) && (*inode != NULL)) {
641 if (CIFS_I(*inode)->clientCanCacheRead) {
642 cFYI(1, "No need to revalidate cached inode sizes");
643 goto cgii_exit;
644 }
645 }
646
647 /* if inode info is not passed, get it from server */
648 if (data == NULL) {
649 if (!server->ops->query_path_info) {
650 rc = -ENOSYS;
651 goto cgii_exit;
652 }
653 buf = kmalloc(sizeof(FILE_ALL_INFO), GFP_KERNEL);
654 if (buf == NULL) {
655 rc = -ENOMEM;
656 goto cgii_exit;
657 }
658 data = (FILE_ALL_INFO *)buf;
659 rc = server->ops->query_path_info(xid, tcon, cifs_sb, full_path,
660 data, &adjust_tz);
661 }
662
663 if (!rc) {
664 cifs_all_info_to_fattr(&fattr, (FILE_ALL_INFO *)data, cifs_sb,
665 adjust_tz);
666 } else if (rc == -EREMOTE) {
667 cifs_create_dfs_fattr(&fattr, sb);
668 rc = 0;
669 } else if (rc == -EACCES && backup_cred(cifs_sb)) {
670 srchinf = kzalloc(sizeof(struct cifs_search_info),
671 GFP_KERNEL);
672 if (srchinf == NULL) {
673 rc = -ENOMEM;
674 goto cgii_exit;
675 }
676
677 srchinf->endOfSearch = false;
678 srchinf->info_level = SMB_FIND_FILE_ID_FULL_DIR_INFO;
679
680 srchflgs = CIFS_SEARCH_CLOSE_ALWAYS |
681 CIFS_SEARCH_CLOSE_AT_END |
682 CIFS_SEARCH_BACKUP_SEARCH;
683
684 rc = CIFSFindFirst(xid, tcon, full_path,
685 cifs_sb, NULL, srchflgs, srchinf, false);
686 if (!rc) {
687 data =
688 (FILE_ALL_INFO *)srchinf->srch_entries_start;
689
690 cifs_dir_info_to_fattr(&fattr,
691 (FILE_DIRECTORY_INFO *)data, cifs_sb);
692 fattr.cf_uniqueid = le64_to_cpu(
693 ((SEARCH_ID_FULL_DIR_INFO *)data)->UniqueId);
694 validinum = true;
695
696 cifs_buf_release(srchinf->ntwrk_buf_start);
697 }
698 kfree(srchinf);
699 } else
700 goto cgii_exit;
701
702 /*
703 * If an inode wasn't passed in, then get the inode number
704 *
705 * Is an i_ino of zero legal? Can we use that to check if the server
706 * supports returning inode numbers? Are there other sanity checks we
707 * can use to ensure that the server is really filling in that field?
708 */
709 if (*inode == NULL) {
710 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM) {
711 if (validinum == false) {
712 if (server->ops->get_srv_inum)
713 tmprc = server->ops->get_srv_inum(xid,
714 tcon, cifs_sb, full_path,
715 &fattr.cf_uniqueid, data);
716 if (tmprc) {
717 cFYI(1, "GetSrvInodeNum rc %d", tmprc);
718 fattr.cf_uniqueid = iunique(sb, ROOT_I);
719 cifs_autodisable_serverino(cifs_sb);
720 }
721 }
722 } else
723 fattr.cf_uniqueid = iunique(sb, ROOT_I);
724 } else
725 fattr.cf_uniqueid = CIFS_I(*inode)->uniqueid;
726
727 /* query for SFU type info if supported and needed */
728 if (fattr.cf_cifsattrs & ATTR_SYSTEM &&
729 cifs_sb->mnt_cifs_flags & CIFS_MOUNT_UNX_EMUL) {
730 tmprc = cifs_sfu_type(&fattr, full_path, cifs_sb, xid);
731 if (tmprc)
732 cFYI(1, "cifs_sfu_type failed: %d", tmprc);
733 }
734
735 #ifdef CONFIG_CIFS_ACL
736 /* fill in 0777 bits from ACL */
737 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_CIFS_ACL) {
738 rc = cifs_acl_to_fattr(cifs_sb, &fattr, *inode, full_path, fid);
739 if (rc) {
740 cFYI(1, "%s: Getting ACL failed with error: %d",
741 __func__, rc);
742 goto cgii_exit;
743 }
744 }
745 #endif /* CONFIG_CIFS_ACL */
746
747 /* fill in remaining high mode bits e.g. SUID, VTX */
748 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_UNX_EMUL)
749 cifs_sfu_mode(&fattr, full_path, cifs_sb, xid);
750
751 /* check for Minshall+French symlinks */
752 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MF_SYMLINKS) {
753 tmprc = CIFSCheckMFSymlink(&fattr, full_path, cifs_sb, xid);
754 if (tmprc)
755 cFYI(1, "CIFSCheckMFSymlink: %d", tmprc);
756 }
757
758 if (!*inode) {
759 *inode = cifs_iget(sb, &fattr);
760 if (!*inode)
761 rc = -ENOMEM;
762 } else {
763 cifs_fattr_to_inode(*inode, &fattr);
764 }
765
766 cgii_exit:
767 kfree(buf);
768 cifs_put_tlink(tlink);
769 return rc;
770 }
771
772 static const struct inode_operations cifs_ipc_inode_ops = {
773 .lookup = cifs_lookup,
774 };
775
776 static int
777 cifs_find_inode(struct inode *inode, void *opaque)
778 {
779 struct cifs_fattr *fattr = (struct cifs_fattr *) opaque;
780
781 /* don't match inode with different uniqueid */
782 if (CIFS_I(inode)->uniqueid != fattr->cf_uniqueid)
783 return 0;
784
785 /* use createtime like an i_generation field */
786 if (CIFS_I(inode)->createtime != fattr->cf_createtime)
787 return 0;
788
789 /* don't match inode of different type */
790 if ((inode->i_mode & S_IFMT) != (fattr->cf_mode & S_IFMT))
791 return 0;
792
793 /* if it's not a directory or has no dentries, then flag it */
794 if (S_ISDIR(inode->i_mode) && !hlist_empty(&inode->i_dentry))
795 fattr->cf_flags |= CIFS_FATTR_INO_COLLISION;
796
797 return 1;
798 }
799
800 static int
801 cifs_init_inode(struct inode *inode, void *opaque)
802 {
803 struct cifs_fattr *fattr = (struct cifs_fattr *) opaque;
804
805 CIFS_I(inode)->uniqueid = fattr->cf_uniqueid;
806 CIFS_I(inode)->createtime = fattr->cf_createtime;
807 return 0;
808 }
809
810 /*
811 * walk dentry list for an inode and report whether it has aliases that
812 * are hashed. We use this to determine if a directory inode can actually
813 * be used.
814 */
815 static bool
816 inode_has_hashed_dentries(struct inode *inode)
817 {
818 struct dentry *dentry;
819
820 spin_lock(&inode->i_lock);
821 hlist_for_each_entry(dentry, &inode->i_dentry, d_alias) {
822 if (!d_unhashed(dentry) || IS_ROOT(dentry)) {
823 spin_unlock(&inode->i_lock);
824 return true;
825 }
826 }
827 spin_unlock(&inode->i_lock);
828 return false;
829 }
830
831 /* Given fattrs, get a corresponding inode */
832 struct inode *
833 cifs_iget(struct super_block *sb, struct cifs_fattr *fattr)
834 {
835 unsigned long hash;
836 struct inode *inode;
837
838 retry_iget5_locked:
839 cFYI(1, "looking for uniqueid=%llu", fattr->cf_uniqueid);
840
841 /* hash down to 32-bits on 32-bit arch */
842 hash = cifs_uniqueid_to_ino_t(fattr->cf_uniqueid);
843
844 inode = iget5_locked(sb, hash, cifs_find_inode, cifs_init_inode, fattr);
845 if (inode) {
846 /* was there a potentially problematic inode collision? */
847 if (fattr->cf_flags & CIFS_FATTR_INO_COLLISION) {
848 fattr->cf_flags &= ~CIFS_FATTR_INO_COLLISION;
849
850 if (inode_has_hashed_dentries(inode)) {
851 cifs_autodisable_serverino(CIFS_SB(sb));
852 iput(inode);
853 fattr->cf_uniqueid = iunique(sb, ROOT_I);
854 goto retry_iget5_locked;
855 }
856 }
857
858 cifs_fattr_to_inode(inode, fattr);
859 if (sb->s_flags & MS_NOATIME)
860 inode->i_flags |= S_NOATIME | S_NOCMTIME;
861 if (inode->i_state & I_NEW) {
862 inode->i_ino = hash;
863 if (S_ISREG(inode->i_mode))
864 inode->i_data.backing_dev_info = sb->s_bdi;
865 #ifdef CONFIG_CIFS_FSCACHE
866 /* initialize per-inode cache cookie pointer */
867 CIFS_I(inode)->fscache = NULL;
868 #endif
869 unlock_new_inode(inode);
870 }
871 }
872
873 return inode;
874 }
875
876 /* gets root inode */
877 struct inode *cifs_root_iget(struct super_block *sb)
878 {
879 unsigned int xid;
880 struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
881 struct inode *inode = NULL;
882 long rc;
883 struct cifs_tcon *tcon = cifs_sb_master_tcon(cifs_sb);
884
885 xid = get_xid();
886 if (tcon->unix_ext)
887 rc = cifs_get_inode_info_unix(&inode, "", sb, xid);
888 else
889 rc = cifs_get_inode_info(&inode, "", NULL, sb, xid, NULL);
890
891 if (!inode) {
892 inode = ERR_PTR(rc);
893 goto out;
894 }
895
896 #ifdef CONFIG_CIFS_FSCACHE
897 /* populate tcon->resource_id */
898 tcon->resource_id = CIFS_I(inode)->uniqueid;
899 #endif
900
901 if (rc && tcon->ipc) {
902 cFYI(1, "ipc connection - fake read inode");
903 spin_lock(&inode->i_lock);
904 inode->i_mode |= S_IFDIR;
905 set_nlink(inode, 2);
906 inode->i_op = &cifs_ipc_inode_ops;
907 inode->i_fop = &simple_dir_operations;
908 inode->i_uid = cifs_sb->mnt_uid;
909 inode->i_gid = cifs_sb->mnt_gid;
910 spin_unlock(&inode->i_lock);
911 } else if (rc) {
912 iget_failed(inode);
913 inode = ERR_PTR(rc);
914 }
915
916 out:
917 /* can not call macro free_xid here since in a void func
918 * TODO: This is no longer true
919 */
920 _free_xid(xid);
921 return inode;
922 }
923
924 int
925 cifs_set_file_info(struct inode *inode, struct iattr *attrs, unsigned int xid,
926 char *full_path, __u32 dosattr)
927 {
928 bool set_time = false;
929 struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
930 struct TCP_Server_Info *server;
931 FILE_BASIC_INFO info_buf;
932
933 if (attrs == NULL)
934 return -EINVAL;
935
936 server = cifs_sb_master_tcon(cifs_sb)->ses->server;
937 if (!server->ops->set_file_info)
938 return -ENOSYS;
939
940 if (attrs->ia_valid & ATTR_ATIME) {
941 set_time = true;
942 info_buf.LastAccessTime =
943 cpu_to_le64(cifs_UnixTimeToNT(attrs->ia_atime));
944 } else
945 info_buf.LastAccessTime = 0;
946
947 if (attrs->ia_valid & ATTR_MTIME) {
948 set_time = true;
949 info_buf.LastWriteTime =
950 cpu_to_le64(cifs_UnixTimeToNT(attrs->ia_mtime));
951 } else
952 info_buf.LastWriteTime = 0;
953
954 /*
955 * Samba throws this field away, but windows may actually use it.
956 * Do not set ctime unless other time stamps are changed explicitly
957 * (i.e. by utimes()) since we would then have a mix of client and
958 * server times.
959 */
960 if (set_time && (attrs->ia_valid & ATTR_CTIME)) {
961 cFYI(1, "CIFS - CTIME changed");
962 info_buf.ChangeTime =
963 cpu_to_le64(cifs_UnixTimeToNT(attrs->ia_ctime));
964 } else
965 info_buf.ChangeTime = 0;
966
967 info_buf.CreationTime = 0; /* don't change */
968 info_buf.Attributes = cpu_to_le32(dosattr);
969
970 return server->ops->set_file_info(inode, full_path, &info_buf, xid);
971 }
972
973 /*
974 * Open the given file (if it isn't already), set the DELETE_ON_CLOSE bit
975 * and rename it to a random name that hopefully won't conflict with
976 * anything else.
977 */
978 int
979 cifs_rename_pending_delete(const char *full_path, struct dentry *dentry,
980 const unsigned int xid)
981 {
982 int oplock = 0;
983 int rc;
984 __u16 netfid;
985 struct inode *inode = dentry->d_inode;
986 struct cifsInodeInfo *cifsInode = CIFS_I(inode);
987 struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
988 struct tcon_link *tlink;
989 struct cifs_tcon *tcon;
990 __u32 dosattr, origattr;
991 FILE_BASIC_INFO *info_buf = NULL;
992
993 tlink = cifs_sb_tlink(cifs_sb);
994 if (IS_ERR(tlink))
995 return PTR_ERR(tlink);
996 tcon = tlink_tcon(tlink);
997
998 /*
999 * We cannot rename the file if the server doesn't support
1000 * CAP_INFOLEVEL_PASSTHRU
1001 */
1002 if (!(tcon->ses->capabilities & CAP_INFOLEVEL_PASSTHRU)) {
1003 rc = -EBUSY;
1004 goto out;
1005 }
1006
1007 rc = CIFSSMBOpen(xid, tcon, full_path, FILE_OPEN,
1008 DELETE|FILE_WRITE_ATTRIBUTES, CREATE_NOT_DIR,
1009 &netfid, &oplock, NULL, cifs_sb->local_nls,
1010 cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR);
1011 if (rc != 0)
1012 goto out;
1013
1014 origattr = cifsInode->cifsAttrs;
1015 if (origattr == 0)
1016 origattr |= ATTR_NORMAL;
1017
1018 dosattr = origattr & ~ATTR_READONLY;
1019 if (dosattr == 0)
1020 dosattr |= ATTR_NORMAL;
1021 dosattr |= ATTR_HIDDEN;
1022
1023 /* set ATTR_HIDDEN and clear ATTR_READONLY, but only if needed */
1024 if (dosattr != origattr) {
1025 info_buf = kzalloc(sizeof(*info_buf), GFP_KERNEL);
1026 if (info_buf == NULL) {
1027 rc = -ENOMEM;
1028 goto out_close;
1029 }
1030 info_buf->Attributes = cpu_to_le32(dosattr);
1031 rc = CIFSSMBSetFileInfo(xid, tcon, info_buf, netfid,
1032 current->tgid);
1033 /* although we would like to mark the file hidden
1034 if that fails we will still try to rename it */
1035 if (!rc)
1036 cifsInode->cifsAttrs = dosattr;
1037 else
1038 dosattr = origattr; /* since not able to change them */
1039 }
1040
1041 /* rename the file */
1042 rc = CIFSSMBRenameOpenFile(xid, tcon, netfid, NULL, cifs_sb->local_nls,
1043 cifs_sb->mnt_cifs_flags &
1044 CIFS_MOUNT_MAP_SPECIAL_CHR);
1045 if (rc != 0) {
1046 rc = -EBUSY;
1047 goto undo_setattr;
1048 }
1049
1050 /* try to set DELETE_ON_CLOSE */
1051 if (!cifsInode->delete_pending) {
1052 rc = CIFSSMBSetFileDisposition(xid, tcon, true, netfid,
1053 current->tgid);
1054 /*
1055 * some samba versions return -ENOENT when we try to set the
1056 * file disposition here. Likely a samba bug, but work around
1057 * it for now. This means that some cifsXXX files may hang
1058 * around after they shouldn't.
1059 *
1060 * BB: remove this hack after more servers have the fix
1061 */
1062 if (rc == -ENOENT)
1063 rc = 0;
1064 else if (rc != 0) {
1065 rc = -EBUSY;
1066 goto undo_rename;
1067 }
1068 cifsInode->delete_pending = true;
1069 }
1070
1071 out_close:
1072 CIFSSMBClose(xid, tcon, netfid);
1073 out:
1074 kfree(info_buf);
1075 cifs_put_tlink(tlink);
1076 return rc;
1077
1078 /*
1079 * reset everything back to the original state. Don't bother
1080 * dealing with errors here since we can't do anything about
1081 * them anyway.
1082 */
1083 undo_rename:
1084 CIFSSMBRenameOpenFile(xid, tcon, netfid, dentry->d_name.name,
1085 cifs_sb->local_nls, cifs_sb->mnt_cifs_flags &
1086 CIFS_MOUNT_MAP_SPECIAL_CHR);
1087 undo_setattr:
1088 if (dosattr != origattr) {
1089 info_buf->Attributes = cpu_to_le32(origattr);
1090 if (!CIFSSMBSetFileInfo(xid, tcon, info_buf, netfid,
1091 current->tgid))
1092 cifsInode->cifsAttrs = origattr;
1093 }
1094
1095 goto out_close;
1096 }
1097
1098 /* copied from fs/nfs/dir.c with small changes */
1099 static void
1100 cifs_drop_nlink(struct inode *inode)
1101 {
1102 spin_lock(&inode->i_lock);
1103 if (inode->i_nlink > 0)
1104 drop_nlink(inode);
1105 spin_unlock(&inode->i_lock);
1106 }
1107
1108 /*
1109 * If dentry->d_inode is null (usually meaning the cached dentry
1110 * is a negative dentry) then we would attempt a standard SMB delete, but
1111 * if that fails we can not attempt the fall back mechanisms on EACCESS
1112 * but will return the EACCESS to the caller. Note that the VFS does not call
1113 * unlink on negative dentries currently.
1114 */
1115 int cifs_unlink(struct inode *dir, struct dentry *dentry)
1116 {
1117 int rc = 0;
1118 unsigned int xid;
1119 char *full_path = NULL;
1120 struct inode *inode = dentry->d_inode;
1121 struct cifsInodeInfo *cifs_inode;
1122 struct super_block *sb = dir->i_sb;
1123 struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
1124 struct tcon_link *tlink;
1125 struct cifs_tcon *tcon;
1126 struct TCP_Server_Info *server;
1127 struct iattr *attrs = NULL;
1128 __u32 dosattr = 0, origattr = 0;
1129
1130 cFYI(1, "cifs_unlink, dir=0x%p, dentry=0x%p", dir, dentry);
1131
1132 tlink = cifs_sb_tlink(cifs_sb);
1133 if (IS_ERR(tlink))
1134 return PTR_ERR(tlink);
1135 tcon = tlink_tcon(tlink);
1136 server = tcon->ses->server;
1137
1138 xid = get_xid();
1139
1140 /* Unlink can be called from rename so we can not take the
1141 * sb->s_vfs_rename_mutex here */
1142 full_path = build_path_from_dentry(dentry);
1143 if (full_path == NULL) {
1144 rc = -ENOMEM;
1145 goto unlink_out;
1146 }
1147
1148 if (cap_unix(tcon->ses) && (CIFS_UNIX_POSIX_PATH_OPS_CAP &
1149 le64_to_cpu(tcon->fsUnixInfo.Capability))) {
1150 rc = CIFSPOSIXDelFile(xid, tcon, full_path,
1151 SMB_POSIX_UNLINK_FILE_TARGET, cifs_sb->local_nls,
1152 cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR);
1153 cFYI(1, "posix del rc %d", rc);
1154 if ((rc == 0) || (rc == -ENOENT))
1155 goto psx_del_no_retry;
1156 }
1157
1158 retry_std_delete:
1159 if (!server->ops->unlink) {
1160 rc = -ENOSYS;
1161 goto psx_del_no_retry;
1162 }
1163
1164 rc = server->ops->unlink(xid, tcon, full_path, cifs_sb);
1165
1166 psx_del_no_retry:
1167 if (!rc) {
1168 if (inode)
1169 cifs_drop_nlink(inode);
1170 } else if (rc == -ENOENT) {
1171 d_drop(dentry);
1172 } else if (rc == -EBUSY) {
1173 if (server->ops->rename_pending_delete) {
1174 rc = server->ops->rename_pending_delete(full_path,
1175 dentry, xid);
1176 if (rc == 0)
1177 cifs_drop_nlink(inode);
1178 }
1179 } else if ((rc == -EACCES) && (dosattr == 0) && inode) {
1180 attrs = kzalloc(sizeof(*attrs), GFP_KERNEL);
1181 if (attrs == NULL) {
1182 rc = -ENOMEM;
1183 goto out_reval;
1184 }
1185
1186 /* try to reset dos attributes */
1187 cifs_inode = CIFS_I(inode);
1188 origattr = cifs_inode->cifsAttrs;
1189 if (origattr == 0)
1190 origattr |= ATTR_NORMAL;
1191 dosattr = origattr & ~ATTR_READONLY;
1192 if (dosattr == 0)
1193 dosattr |= ATTR_NORMAL;
1194 dosattr |= ATTR_HIDDEN;
1195
1196 rc = cifs_set_file_info(inode, attrs, xid, full_path, dosattr);
1197 if (rc != 0)
1198 goto out_reval;
1199
1200 goto retry_std_delete;
1201 }
1202
1203 /* undo the setattr if we errored out and it's needed */
1204 if (rc != 0 && dosattr != 0)
1205 cifs_set_file_info(inode, attrs, xid, full_path, origattr);
1206
1207 out_reval:
1208 if (inode) {
1209 cifs_inode = CIFS_I(inode);
1210 cifs_inode->time = 0; /* will force revalidate to get info
1211 when needed */
1212 inode->i_ctime = current_fs_time(sb);
1213 }
1214 dir->i_ctime = dir->i_mtime = current_fs_time(sb);
1215 cifs_inode = CIFS_I(dir);
1216 CIFS_I(dir)->time = 0; /* force revalidate of dir as well */
1217 unlink_out:
1218 kfree(full_path);
1219 kfree(attrs);
1220 free_xid(xid);
1221 cifs_put_tlink(tlink);
1222 return rc;
1223 }
1224
1225 static int
1226 cifs_mkdir_qinfo(struct inode *parent, struct dentry *dentry, umode_t mode,
1227 const char *full_path, struct cifs_sb_info *cifs_sb,
1228 struct cifs_tcon *tcon, const unsigned int xid)
1229 {
1230 int rc = 0;
1231 struct inode *inode = NULL;
1232
1233 if (tcon->unix_ext)
1234 rc = cifs_get_inode_info_unix(&inode, full_path, parent->i_sb,
1235 xid);
1236 else
1237 rc = cifs_get_inode_info(&inode, full_path, NULL, parent->i_sb,
1238 xid, NULL);
1239
1240 if (rc)
1241 return rc;
1242
1243 /*
1244 * setting nlink not necessary except in cases where we failed to get it
1245 * from the server or was set bogus. Also, since this is a brand new
1246 * inode, no need to grab the i_lock before setting the i_nlink.
1247 */
1248 if (inode->i_nlink < 2)
1249 set_nlink(inode, 2);
1250 mode &= ~current_umask();
1251 /* must turn on setgid bit if parent dir has it */
1252 if (parent->i_mode & S_ISGID)
1253 mode |= S_ISGID;
1254
1255 if (tcon->unix_ext) {
1256 struct cifs_unix_set_info_args args = {
1257 .mode = mode,
1258 .ctime = NO_CHANGE_64,
1259 .atime = NO_CHANGE_64,
1260 .mtime = NO_CHANGE_64,
1261 .device = 0,
1262 };
1263 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SET_UID) {
1264 args.uid = current_fsuid();
1265 if (parent->i_mode & S_ISGID)
1266 args.gid = parent->i_gid;
1267 else
1268 args.gid = current_fsgid();
1269 } else {
1270 args.uid = INVALID_UID; /* no change */
1271 args.gid = INVALID_GID; /* no change */
1272 }
1273 CIFSSMBUnixSetPathInfo(xid, tcon, full_path, &args,
1274 cifs_sb->local_nls,
1275 cifs_sb->mnt_cifs_flags &
1276 CIFS_MOUNT_MAP_SPECIAL_CHR);
1277 } else {
1278 struct TCP_Server_Info *server = tcon->ses->server;
1279 if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_CIFS_ACL) &&
1280 (mode & S_IWUGO) == 0 && server->ops->mkdir_setinfo)
1281 server->ops->mkdir_setinfo(inode, full_path, cifs_sb,
1282 tcon, xid);
1283 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DYNPERM)
1284 inode->i_mode = (mode | S_IFDIR);
1285
1286 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SET_UID) {
1287 inode->i_uid = current_fsuid();
1288 if (inode->i_mode & S_ISGID)
1289 inode->i_gid = parent->i_gid;
1290 else
1291 inode->i_gid = current_fsgid();
1292 }
1293 }
1294 d_instantiate(dentry, inode);
1295 return rc;
1296 }
1297
1298 static int
1299 cifs_posix_mkdir(struct inode *inode, struct dentry *dentry, umode_t mode,
1300 const char *full_path, struct cifs_sb_info *cifs_sb,
1301 struct cifs_tcon *tcon, const unsigned int xid)
1302 {
1303 int rc = 0;
1304 u32 oplock = 0;
1305 FILE_UNIX_BASIC_INFO *info = NULL;
1306 struct inode *newinode = NULL;
1307 struct cifs_fattr fattr;
1308
1309 info = kzalloc(sizeof(FILE_UNIX_BASIC_INFO), GFP_KERNEL);
1310 if (info == NULL) {
1311 rc = -ENOMEM;
1312 goto posix_mkdir_out;
1313 }
1314
1315 mode &= ~current_umask();
1316 rc = CIFSPOSIXCreate(xid, tcon, SMB_O_DIRECTORY | SMB_O_CREAT, mode,
1317 NULL /* netfid */, info, &oplock, full_path,
1318 cifs_sb->local_nls, cifs_sb->mnt_cifs_flags &
1319 CIFS_MOUNT_MAP_SPECIAL_CHR);
1320 if (rc == -EOPNOTSUPP)
1321 goto posix_mkdir_out;
1322 else if (rc) {
1323 cFYI(1, "posix mkdir returned 0x%x", rc);
1324 d_drop(dentry);
1325 goto posix_mkdir_out;
1326 }
1327
1328 if (info->Type == cpu_to_le32(-1))
1329 /* no return info, go query for it */
1330 goto posix_mkdir_get_info;
1331 /*
1332 * BB check (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SET_UID ) to see if
1333 * need to set uid/gid.
1334 */
1335
1336 cifs_unix_basic_to_fattr(&fattr, info, cifs_sb);
1337 cifs_fill_uniqueid(inode->i_sb, &fattr);
1338 newinode = cifs_iget(inode->i_sb, &fattr);
1339 if (!newinode)
1340 goto posix_mkdir_get_info;
1341
1342 d_instantiate(dentry, newinode);
1343
1344 #ifdef CONFIG_CIFS_DEBUG2
1345 cFYI(1, "instantiated dentry %p %s to inode %p", dentry,
1346 dentry->d_name.name, newinode);
1347
1348 if (newinode->i_nlink != 2)
1349 cFYI(1, "unexpected number of links %d", newinode->i_nlink);
1350 #endif
1351
1352 posix_mkdir_out:
1353 kfree(info);
1354 return rc;
1355 posix_mkdir_get_info:
1356 rc = cifs_mkdir_qinfo(inode, dentry, mode, full_path, cifs_sb, tcon,
1357 xid);
1358 goto posix_mkdir_out;
1359 }
1360
1361 int cifs_mkdir(struct inode *inode, struct dentry *direntry, umode_t mode)
1362 {
1363 int rc = 0;
1364 unsigned int xid;
1365 struct cifs_sb_info *cifs_sb;
1366 struct tcon_link *tlink;
1367 struct cifs_tcon *tcon;
1368 struct TCP_Server_Info *server;
1369 char *full_path;
1370
1371 cFYI(1, "In cifs_mkdir, mode = 0x%hx inode = 0x%p", mode, inode);
1372
1373 cifs_sb = CIFS_SB(inode->i_sb);
1374 tlink = cifs_sb_tlink(cifs_sb);
1375 if (IS_ERR(tlink))
1376 return PTR_ERR(tlink);
1377 tcon = tlink_tcon(tlink);
1378
1379 xid = get_xid();
1380
1381 full_path = build_path_from_dentry(direntry);
1382 if (full_path == NULL) {
1383 rc = -ENOMEM;
1384 goto mkdir_out;
1385 }
1386
1387 if (cap_unix(tcon->ses) && (CIFS_UNIX_POSIX_PATH_OPS_CAP &
1388 le64_to_cpu(tcon->fsUnixInfo.Capability))) {
1389 rc = cifs_posix_mkdir(inode, direntry, mode, full_path, cifs_sb,
1390 tcon, xid);
1391 if (rc != -EOPNOTSUPP)
1392 goto mkdir_out;
1393 }
1394
1395 server = tcon->ses->server;
1396
1397 if (!server->ops->mkdir) {
1398 rc = -ENOSYS;
1399 goto mkdir_out;
1400 }
1401
1402 /* BB add setting the equivalent of mode via CreateX w/ACLs */
1403 rc = server->ops->mkdir(xid, tcon, full_path, cifs_sb);
1404 if (rc) {
1405 cFYI(1, "cifs_mkdir returned 0x%x", rc);
1406 d_drop(direntry);
1407 goto mkdir_out;
1408 }
1409
1410 rc = cifs_mkdir_qinfo(inode, direntry, mode, full_path, cifs_sb, tcon,
1411 xid);
1412 mkdir_out:
1413 /*
1414 * Force revalidate to get parent dir info when needed since cached
1415 * attributes are invalid now.
1416 */
1417 CIFS_I(inode)->time = 0;
1418 kfree(full_path);
1419 free_xid(xid);
1420 cifs_put_tlink(tlink);
1421 return rc;
1422 }
1423
1424 int cifs_rmdir(struct inode *inode, struct dentry *direntry)
1425 {
1426 int rc = 0;
1427 unsigned int xid;
1428 struct cifs_sb_info *cifs_sb;
1429 struct tcon_link *tlink;
1430 struct cifs_tcon *tcon;
1431 struct TCP_Server_Info *server;
1432 char *full_path = NULL;
1433 struct cifsInodeInfo *cifsInode;
1434
1435 cFYI(1, "cifs_rmdir, inode = 0x%p", inode);
1436
1437 xid = get_xid();
1438
1439 full_path = build_path_from_dentry(direntry);
1440 if (full_path == NULL) {
1441 rc = -ENOMEM;
1442 goto rmdir_exit;
1443 }
1444
1445 cifs_sb = CIFS_SB(inode->i_sb);
1446 tlink = cifs_sb_tlink(cifs_sb);
1447 if (IS_ERR(tlink)) {
1448 rc = PTR_ERR(tlink);
1449 goto rmdir_exit;
1450 }
1451 tcon = tlink_tcon(tlink);
1452 server = tcon->ses->server;
1453
1454 if (!server->ops->rmdir) {
1455 rc = -ENOSYS;
1456 cifs_put_tlink(tlink);
1457 goto rmdir_exit;
1458 }
1459
1460 rc = server->ops->rmdir(xid, tcon, full_path, cifs_sb);
1461 cifs_put_tlink(tlink);
1462
1463 if (!rc) {
1464 spin_lock(&direntry->d_inode->i_lock);
1465 i_size_write(direntry->d_inode, 0);
1466 clear_nlink(direntry->d_inode);
1467 spin_unlock(&direntry->d_inode->i_lock);
1468 }
1469
1470 cifsInode = CIFS_I(direntry->d_inode);
1471 /* force revalidate to go get info when needed */
1472 cifsInode->time = 0;
1473
1474 cifsInode = CIFS_I(inode);
1475 /*
1476 * Force revalidate to get parent dir info when needed since cached
1477 * attributes are invalid now.
1478 */
1479 cifsInode->time = 0;
1480
1481 direntry->d_inode->i_ctime = inode->i_ctime = inode->i_mtime =
1482 current_fs_time(inode->i_sb);
1483
1484 rmdir_exit:
1485 kfree(full_path);
1486 free_xid(xid);
1487 return rc;
1488 }
1489
1490 static int
1491 cifs_do_rename(const unsigned int xid, struct dentry *from_dentry,
1492 const char *from_path, struct dentry *to_dentry,
1493 const char *to_path)
1494 {
1495 struct cifs_sb_info *cifs_sb = CIFS_SB(from_dentry->d_sb);
1496 struct tcon_link *tlink;
1497 struct cifs_tcon *tcon;
1498 struct TCP_Server_Info *server;
1499 __u16 srcfid;
1500 int oplock, rc;
1501
1502 tlink = cifs_sb_tlink(cifs_sb);
1503 if (IS_ERR(tlink))
1504 return PTR_ERR(tlink);
1505 tcon = tlink_tcon(tlink);
1506 server = tcon->ses->server;
1507
1508 if (!server->ops->rename)
1509 return -ENOSYS;
1510
1511 /* try path-based rename first */
1512 rc = server->ops->rename(xid, tcon, from_path, to_path, cifs_sb);
1513
1514 /*
1515 * Don't bother with rename by filehandle unless file is busy and
1516 * source. Note that cross directory moves do not work with
1517 * rename by filehandle to various Windows servers.
1518 */
1519 if (rc == 0 || rc != -EBUSY)
1520 goto do_rename_exit;
1521
1522 /* open-file renames don't work across directories */
1523 if (to_dentry->d_parent != from_dentry->d_parent)
1524 goto do_rename_exit;
1525
1526 /* open the file to be renamed -- we need DELETE perms */
1527 rc = CIFSSMBOpen(xid, tcon, from_path, FILE_OPEN, DELETE,
1528 CREATE_NOT_DIR, &srcfid, &oplock, NULL,
1529 cifs_sb->local_nls, cifs_sb->mnt_cifs_flags &
1530 CIFS_MOUNT_MAP_SPECIAL_CHR);
1531 if (rc == 0) {
1532 rc = CIFSSMBRenameOpenFile(xid, tcon, srcfid,
1533 (const char *) to_dentry->d_name.name,
1534 cifs_sb->local_nls, cifs_sb->mnt_cifs_flags &
1535 CIFS_MOUNT_MAP_SPECIAL_CHR);
1536 CIFSSMBClose(xid, tcon, srcfid);
1537 }
1538 do_rename_exit:
1539 cifs_put_tlink(tlink);
1540 return rc;
1541 }
1542
1543 int
1544 cifs_rename(struct inode *source_dir, struct dentry *source_dentry,
1545 struct inode *target_dir, struct dentry *target_dentry)
1546 {
1547 char *from_name = NULL;
1548 char *to_name = NULL;
1549 struct cifs_sb_info *cifs_sb;
1550 struct tcon_link *tlink;
1551 struct cifs_tcon *tcon;
1552 FILE_UNIX_BASIC_INFO *info_buf_source = NULL;
1553 FILE_UNIX_BASIC_INFO *info_buf_target;
1554 unsigned int xid;
1555 int rc, tmprc;
1556
1557 cifs_sb = CIFS_SB(source_dir->i_sb);
1558 tlink = cifs_sb_tlink(cifs_sb);
1559 if (IS_ERR(tlink))
1560 return PTR_ERR(tlink);
1561 tcon = tlink_tcon(tlink);
1562
1563 xid = get_xid();
1564
1565 /*
1566 * we already have the rename sem so we do not need to
1567 * grab it again here to protect the path integrity
1568 */
1569 from_name = build_path_from_dentry(source_dentry);
1570 if (from_name == NULL) {
1571 rc = -ENOMEM;
1572 goto cifs_rename_exit;
1573 }
1574
1575 to_name = build_path_from_dentry(target_dentry);
1576 if (to_name == NULL) {
1577 rc = -ENOMEM;
1578 goto cifs_rename_exit;
1579 }
1580
1581 rc = cifs_do_rename(xid, source_dentry, from_name, target_dentry,
1582 to_name);
1583
1584 if (rc == -EEXIST && tcon->unix_ext) {
1585 /*
1586 * Are src and dst hardlinks of same inode? We can only tell
1587 * with unix extensions enabled.
1588 */
1589 info_buf_source =
1590 kmalloc(2 * sizeof(FILE_UNIX_BASIC_INFO),
1591 GFP_KERNEL);
1592 if (info_buf_source == NULL) {
1593 rc = -ENOMEM;
1594 goto cifs_rename_exit;
1595 }
1596
1597 info_buf_target = info_buf_source + 1;
1598 tmprc = CIFSSMBUnixQPathInfo(xid, tcon, from_name,
1599 info_buf_source,
1600 cifs_sb->local_nls,
1601 cifs_sb->mnt_cifs_flags &
1602 CIFS_MOUNT_MAP_SPECIAL_CHR);
1603 if (tmprc != 0)
1604 goto unlink_target;
1605
1606 tmprc = CIFSSMBUnixQPathInfo(xid, tcon, to_name,
1607 info_buf_target,
1608 cifs_sb->local_nls,
1609 cifs_sb->mnt_cifs_flags &
1610 CIFS_MOUNT_MAP_SPECIAL_CHR);
1611
1612 if (tmprc == 0 && (info_buf_source->UniqueId ==
1613 info_buf_target->UniqueId)) {
1614 /* same file, POSIX says that this is a noop */
1615 rc = 0;
1616 goto cifs_rename_exit;
1617 }
1618 }
1619 /*
1620 * else ... BB we could add the same check for Windows by
1621 * checking the UniqueId via FILE_INTERNAL_INFO
1622 */
1623
1624 unlink_target:
1625 /* Try unlinking the target dentry if it's not negative */
1626 if (target_dentry->d_inode && (rc == -EACCES || rc == -EEXIST)) {
1627 tmprc = cifs_unlink(target_dir, target_dentry);
1628 if (tmprc)
1629 goto cifs_rename_exit;
1630 rc = cifs_do_rename(xid, source_dentry, from_name,
1631 target_dentry, to_name);
1632 }
1633
1634 cifs_rename_exit:
1635 kfree(info_buf_source);
1636 kfree(from_name);
1637 kfree(to_name);
1638 free_xid(xid);
1639 cifs_put_tlink(tlink);
1640 return rc;
1641 }
1642
1643 static bool
1644 cifs_inode_needs_reval(struct inode *inode)
1645 {
1646 struct cifsInodeInfo *cifs_i = CIFS_I(inode);
1647 struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
1648
1649 if (cifs_i->clientCanCacheRead)
1650 return false;
1651
1652 if (!lookupCacheEnabled)
1653 return true;
1654
1655 if (cifs_i->time == 0)
1656 return true;
1657
1658 if (!time_in_range(jiffies, cifs_i->time,
1659 cifs_i->time + cifs_sb->actimeo))
1660 return true;
1661
1662 /* hardlinked files w/ noserverino get "special" treatment */
1663 if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM) &&
1664 S_ISREG(inode->i_mode) && inode->i_nlink != 1)
1665 return true;
1666
1667 return false;
1668 }
1669
1670 /*
1671 * Zap the cache. Called when invalid_mapping flag is set.
1672 */
1673 int
1674 cifs_invalidate_mapping(struct inode *inode)
1675 {
1676 int rc = 0;
1677 struct cifsInodeInfo *cifs_i = CIFS_I(inode);
1678
1679 cifs_i->invalid_mapping = false;
1680
1681 if (inode->i_mapping && inode->i_mapping->nrpages != 0) {
1682 rc = invalidate_inode_pages2(inode->i_mapping);
1683 if (rc) {
1684 cERROR(1, "%s: could not invalidate inode %p", __func__,
1685 inode);
1686 cifs_i->invalid_mapping = true;
1687 }
1688 }
1689
1690 cifs_fscache_reset_inode_cookie(inode);
1691 return rc;
1692 }
1693
1694 int cifs_revalidate_file_attr(struct file *filp)
1695 {
1696 int rc = 0;
1697 struct inode *inode = file_inode(filp);
1698 struct cifsFileInfo *cfile = (struct cifsFileInfo *) filp->private_data;
1699
1700 if (!cifs_inode_needs_reval(inode))
1701 return rc;
1702
1703 if (tlink_tcon(cfile->tlink)->unix_ext)
1704 rc = cifs_get_file_info_unix(filp);
1705 else
1706 rc = cifs_get_file_info(filp);
1707
1708 return rc;
1709 }
1710
1711 int cifs_revalidate_dentry_attr(struct dentry *dentry)
1712 {
1713 unsigned int xid;
1714 int rc = 0;
1715 struct inode *inode = dentry->d_inode;
1716 struct super_block *sb = dentry->d_sb;
1717 char *full_path = NULL;
1718
1719 if (inode == NULL)
1720 return -ENOENT;
1721
1722 if (!cifs_inode_needs_reval(inode))
1723 return rc;
1724
1725 xid = get_xid();
1726
1727 /* can not safely grab the rename sem here if rename calls revalidate
1728 since that would deadlock */
1729 full_path = build_path_from_dentry(dentry);
1730 if (full_path == NULL) {
1731 rc = -ENOMEM;
1732 goto out;
1733 }
1734
1735 cFYI(1, "Update attributes: %s inode 0x%p count %d dentry: 0x%p d_time "
1736 "%ld jiffies %ld", full_path, inode, inode->i_count.counter,
1737 dentry, dentry->d_time, jiffies);
1738
1739 if (cifs_sb_master_tcon(CIFS_SB(sb))->unix_ext)
1740 rc = cifs_get_inode_info_unix(&inode, full_path, sb, xid);
1741 else
1742 rc = cifs_get_inode_info(&inode, full_path, NULL, sb,
1743 xid, NULL);
1744
1745 out:
1746 kfree(full_path);
1747 free_xid(xid);
1748 return rc;
1749 }
1750
1751 int cifs_revalidate_file(struct file *filp)
1752 {
1753 int rc;
1754 struct inode *inode = file_inode(filp);
1755
1756 rc = cifs_revalidate_file_attr(filp);
1757 if (rc)
1758 return rc;
1759
1760 if (CIFS_I(inode)->invalid_mapping)
1761 rc = cifs_invalidate_mapping(inode);
1762 return rc;
1763 }
1764
1765 /* revalidate a dentry's inode attributes */
1766 int cifs_revalidate_dentry(struct dentry *dentry)
1767 {
1768 int rc;
1769 struct inode *inode = dentry->d_inode;
1770
1771 rc = cifs_revalidate_dentry_attr(dentry);
1772 if (rc)
1773 return rc;
1774
1775 if (CIFS_I(inode)->invalid_mapping)
1776 rc = cifs_invalidate_mapping(inode);
1777 return rc;
1778 }
1779
1780 int cifs_getattr(struct vfsmount *mnt, struct dentry *dentry,
1781 struct kstat *stat)
1782 {
1783 struct cifs_sb_info *cifs_sb = CIFS_SB(dentry->d_sb);
1784 struct cifs_tcon *tcon = cifs_sb_master_tcon(cifs_sb);
1785 struct inode *inode = dentry->d_inode;
1786 int rc;
1787
1788 /*
1789 * We need to be sure that all dirty pages are written and the server
1790 * has actual ctime, mtime and file length.
1791 */
1792 if (!CIFS_I(inode)->clientCanCacheRead && inode->i_mapping &&
1793 inode->i_mapping->nrpages != 0) {
1794 rc = filemap_fdatawait(inode->i_mapping);
1795 if (rc) {
1796 mapping_set_error(inode->i_mapping, rc);
1797 return rc;
1798 }
1799 }
1800
1801 rc = cifs_revalidate_dentry_attr(dentry);
1802 if (rc)
1803 return rc;
1804
1805 generic_fillattr(inode, stat);
1806 stat->blksize = CIFS_MAX_MSGSIZE;
1807 stat->ino = CIFS_I(inode)->uniqueid;
1808
1809 /*
1810 * If on a multiuser mount without unix extensions or cifsacl being
1811 * enabled, and the admin hasn't overridden them, set the ownership
1812 * to the fsuid/fsgid of the current process.
1813 */
1814 if ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MULTIUSER) &&
1815 !(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_CIFS_ACL) &&
1816 !tcon->unix_ext) {
1817 if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_OVERR_UID))
1818 stat->uid = current_fsuid();
1819 if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_OVERR_GID))
1820 stat->gid = current_fsgid();
1821 }
1822 return rc;
1823 }
1824
1825 static int cifs_truncate_page(struct address_space *mapping, loff_t from)
1826 {
1827 pgoff_t index = from >> PAGE_CACHE_SHIFT;
1828 unsigned offset = from & (PAGE_CACHE_SIZE - 1);
1829 struct page *page;
1830 int rc = 0;
1831
1832 page = grab_cache_page(mapping, index);
1833 if (!page)
1834 return -ENOMEM;
1835
1836 zero_user_segment(page, offset, PAGE_CACHE_SIZE);
1837 unlock_page(page);
1838 page_cache_release(page);
1839 return rc;
1840 }
1841
1842 static void cifs_setsize(struct inode *inode, loff_t offset)
1843 {
1844 loff_t oldsize;
1845
1846 spin_lock(&inode->i_lock);
1847 oldsize = inode->i_size;
1848 i_size_write(inode, offset);
1849 spin_unlock(&inode->i_lock);
1850
1851 truncate_pagecache(inode, oldsize, offset);
1852 }
1853
1854 static int
1855 cifs_set_file_size(struct inode *inode, struct iattr *attrs,
1856 unsigned int xid, char *full_path)
1857 {
1858 int rc;
1859 struct cifsFileInfo *open_file;
1860 struct cifsInodeInfo *cifsInode = CIFS_I(inode);
1861 struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
1862 struct tcon_link *tlink = NULL;
1863 struct cifs_tcon *tcon = NULL;
1864 struct TCP_Server_Info *server;
1865 struct cifs_io_parms io_parms;
1866
1867 /*
1868 * To avoid spurious oplock breaks from server, in the case of
1869 * inodes that we already have open, avoid doing path based
1870 * setting of file size if we can do it by handle.
1871 * This keeps our caching token (oplock) and avoids timeouts
1872 * when the local oplock break takes longer to flush
1873 * writebehind data than the SMB timeout for the SetPathInfo
1874 * request would allow
1875 */
1876 open_file = find_writable_file(cifsInode, true);
1877 if (open_file) {
1878 tcon = tlink_tcon(open_file->tlink);
1879 server = tcon->ses->server;
1880 if (server->ops->set_file_size)
1881 rc = server->ops->set_file_size(xid, tcon, open_file,
1882 attrs->ia_size, false);
1883 else
1884 rc = -ENOSYS;
1885 cifsFileInfo_put(open_file);
1886 cFYI(1, "SetFSize for attrs rc = %d", rc);
1887 if ((rc == -EINVAL) || (rc == -EOPNOTSUPP)) {
1888 unsigned int bytes_written;
1889
1890 io_parms.netfid = open_file->fid.netfid;
1891 io_parms.pid = open_file->pid;
1892 io_parms.tcon = tcon;
1893 io_parms.offset = 0;
1894 io_parms.length = attrs->ia_size;
1895 rc = CIFSSMBWrite(xid, &io_parms, &bytes_written,
1896 NULL, NULL, 1);
1897 cFYI(1, "Wrt seteof rc %d", rc);
1898 }
1899 } else
1900 rc = -EINVAL;
1901
1902 if (!rc)
1903 goto set_size_out;
1904
1905 if (tcon == NULL) {
1906 tlink = cifs_sb_tlink(cifs_sb);
1907 if (IS_ERR(tlink))
1908 return PTR_ERR(tlink);
1909 tcon = tlink_tcon(tlink);
1910 server = tcon->ses->server;
1911 }
1912
1913 /*
1914 * Set file size by pathname rather than by handle either because no
1915 * valid, writeable file handle for it was found or because there was
1916 * an error setting it by handle.
1917 */
1918 if (server->ops->set_path_size)
1919 rc = server->ops->set_path_size(xid, tcon, full_path,
1920 attrs->ia_size, cifs_sb, false);
1921 else
1922 rc = -ENOSYS;
1923 cFYI(1, "SetEOF by path (setattrs) rc = %d", rc);
1924 if ((rc == -EINVAL) || (rc == -EOPNOTSUPP)) {
1925 __u16 netfid;
1926 int oplock = 0;
1927
1928 rc = SMBLegacyOpen(xid, tcon, full_path, FILE_OPEN,
1929 GENERIC_WRITE, CREATE_NOT_DIR, &netfid,
1930 &oplock, NULL, cifs_sb->local_nls,
1931 cifs_sb->mnt_cifs_flags &
1932 CIFS_MOUNT_MAP_SPECIAL_CHR);
1933 if (rc == 0) {
1934 unsigned int bytes_written;
1935
1936 io_parms.netfid = netfid;
1937 io_parms.pid = current->tgid;
1938 io_parms.tcon = tcon;
1939 io_parms.offset = 0;
1940 io_parms.length = attrs->ia_size;
1941 rc = CIFSSMBWrite(xid, &io_parms, &bytes_written, NULL,
1942 NULL, 1);
1943 cFYI(1, "wrt seteof rc %d", rc);
1944 CIFSSMBClose(xid, tcon, netfid);
1945 }
1946 }
1947 if (tlink)
1948 cifs_put_tlink(tlink);
1949
1950 set_size_out:
1951 if (rc == 0) {
1952 cifsInode->server_eof = attrs->ia_size;
1953 cifs_setsize(inode, attrs->ia_size);
1954 cifs_truncate_page(inode->i_mapping, inode->i_size);
1955 }
1956
1957 return rc;
1958 }
1959
1960 static int
1961 cifs_setattr_unix(struct dentry *direntry, struct iattr *attrs)
1962 {
1963 int rc;
1964 unsigned int xid;
1965 char *full_path = NULL;
1966 struct inode *inode = direntry->d_inode;
1967 struct cifsInodeInfo *cifsInode = CIFS_I(inode);
1968 struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
1969 struct tcon_link *tlink;
1970 struct cifs_tcon *pTcon;
1971 struct cifs_unix_set_info_args *args = NULL;
1972 struct cifsFileInfo *open_file;
1973
1974 cFYI(1, "setattr_unix on file %s attrs->ia_valid=0x%x",
1975 direntry->d_name.name, attrs->ia_valid);
1976
1977 xid = get_xid();
1978
1979 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_PERM)
1980 attrs->ia_valid |= ATTR_FORCE;
1981
1982 rc = inode_change_ok(inode, attrs);
1983 if (rc < 0)
1984 goto out;
1985
1986 full_path = build_path_from_dentry(direntry);
1987 if (full_path == NULL) {
1988 rc = -ENOMEM;
1989 goto out;
1990 }
1991
1992 /*
1993 * Attempt to flush data before changing attributes. We need to do
1994 * this for ATTR_SIZE and ATTR_MTIME for sure, and if we change the
1995 * ownership or mode then we may also need to do this. Here, we take
1996 * the safe way out and just do the flush on all setattr requests. If
1997 * the flush returns error, store it to report later and continue.
1998 *
1999 * BB: This should be smarter. Why bother flushing pages that
2000 * will be truncated anyway? Also, should we error out here if
2001 * the flush returns error?
2002 */
2003 rc = filemap_write_and_wait(inode->i_mapping);
2004 mapping_set_error(inode->i_mapping, rc);
2005 rc = 0;
2006
2007 if (attrs->ia_valid & ATTR_SIZE) {
2008 rc = cifs_set_file_size(inode, attrs, xid, full_path);
2009 if (rc != 0)
2010 goto out;
2011 }
2012
2013 /* skip mode change if it's just for clearing setuid/setgid */
2014 if (attrs->ia_valid & (ATTR_KILL_SUID|ATTR_KILL_SGID))
2015 attrs->ia_valid &= ~ATTR_MODE;
2016
2017 args = kmalloc(sizeof(*args), GFP_KERNEL);
2018 if (args == NULL) {
2019 rc = -ENOMEM;
2020 goto out;
2021 }
2022
2023 /* set up the struct */
2024 if (attrs->ia_valid & ATTR_MODE)
2025 args->mode = attrs->ia_mode;
2026 else
2027 args->mode = NO_CHANGE_64;
2028
2029 if (attrs->ia_valid & ATTR_UID)
2030 args->uid = attrs->ia_uid;
2031 else
2032 args->uid = INVALID_UID; /* no change */
2033
2034 if (attrs->ia_valid & ATTR_GID)
2035 args->gid = attrs->ia_gid;
2036 else
2037 args->gid = INVALID_GID; /* no change */
2038
2039 if (attrs->ia_valid & ATTR_ATIME)
2040 args->atime = cifs_UnixTimeToNT(attrs->ia_atime);
2041 else
2042 args->atime = NO_CHANGE_64;
2043
2044 if (attrs->ia_valid & ATTR_MTIME)
2045 args->mtime = cifs_UnixTimeToNT(attrs->ia_mtime);
2046 else
2047 args->mtime = NO_CHANGE_64;
2048
2049 if (attrs->ia_valid & ATTR_CTIME)
2050 args->ctime = cifs_UnixTimeToNT(attrs->ia_ctime);
2051 else
2052 args->ctime = NO_CHANGE_64;
2053
2054 args->device = 0;
2055 open_file = find_writable_file(cifsInode, true);
2056 if (open_file) {
2057 u16 nfid = open_file->fid.netfid;
2058 u32 npid = open_file->pid;
2059 pTcon = tlink_tcon(open_file->tlink);
2060 rc = CIFSSMBUnixSetFileInfo(xid, pTcon, args, nfid, npid);
2061 cifsFileInfo_put(open_file);
2062 } else {
2063 tlink = cifs_sb_tlink(cifs_sb);
2064 if (IS_ERR(tlink)) {
2065 rc = PTR_ERR(tlink);
2066 goto out;
2067 }
2068 pTcon = tlink_tcon(tlink);
2069 rc = CIFSSMBUnixSetPathInfo(xid, pTcon, full_path, args,
2070 cifs_sb->local_nls,
2071 cifs_sb->mnt_cifs_flags &
2072 CIFS_MOUNT_MAP_SPECIAL_CHR);
2073 cifs_put_tlink(tlink);
2074 }
2075
2076 if (rc)
2077 goto out;
2078
2079 if ((attrs->ia_valid & ATTR_SIZE) &&
2080 attrs->ia_size != i_size_read(inode))
2081 truncate_setsize(inode, attrs->ia_size);
2082
2083 setattr_copy(inode, attrs);
2084 mark_inode_dirty(inode);
2085
2086 /* force revalidate when any of these times are set since some
2087 of the fs types (eg ext3, fat) do not have fine enough
2088 time granularity to match protocol, and we do not have a
2089 a way (yet) to query the server fs's time granularity (and
2090 whether it rounds times down).
2091 */
2092 if (attrs->ia_valid & (ATTR_MTIME | ATTR_CTIME))
2093 cifsInode->time = 0;
2094 out:
2095 kfree(args);
2096 kfree(full_path);
2097 free_xid(xid);
2098 return rc;
2099 }
2100
2101 static int
2102 cifs_setattr_nounix(struct dentry *direntry, struct iattr *attrs)
2103 {
2104 unsigned int xid;
2105 kuid_t uid = INVALID_UID;
2106 kgid_t gid = INVALID_GID;
2107 struct inode *inode = direntry->d_inode;
2108 struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
2109 struct cifsInodeInfo *cifsInode = CIFS_I(inode);
2110 char *full_path = NULL;
2111 int rc = -EACCES;
2112 __u32 dosattr = 0;
2113 __u64 mode = NO_CHANGE_64;
2114
2115 xid = get_xid();
2116
2117 cFYI(1, "setattr on file %s attrs->iavalid 0x%x",
2118 direntry->d_name.name, attrs->ia_valid);
2119
2120 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_PERM)
2121 attrs->ia_valid |= ATTR_FORCE;
2122
2123 rc = inode_change_ok(inode, attrs);
2124 if (rc < 0) {
2125 free_xid(xid);
2126 return rc;
2127 }
2128
2129 full_path = build_path_from_dentry(direntry);
2130 if (full_path == NULL) {
2131 rc = -ENOMEM;
2132 free_xid(xid);
2133 return rc;
2134 }
2135
2136 /*
2137 * Attempt to flush data before changing attributes. We need to do
2138 * this for ATTR_SIZE and ATTR_MTIME for sure, and if we change the
2139 * ownership or mode then we may also need to do this. Here, we take
2140 * the safe way out and just do the flush on all setattr requests. If
2141 * the flush returns error, store it to report later and continue.
2142 *
2143 * BB: This should be smarter. Why bother flushing pages that
2144 * will be truncated anyway? Also, should we error out here if
2145 * the flush returns error?
2146 */
2147 rc = filemap_write_and_wait(inode->i_mapping);
2148 mapping_set_error(inode->i_mapping, rc);
2149 rc = 0;
2150
2151 if (attrs->ia_valid & ATTR_SIZE) {
2152 rc = cifs_set_file_size(inode, attrs, xid, full_path);
2153 if (rc != 0)
2154 goto cifs_setattr_exit;
2155 }
2156
2157 if (attrs->ia_valid & ATTR_UID)
2158 uid = attrs->ia_uid;
2159
2160 if (attrs->ia_valid & ATTR_GID)
2161 gid = attrs->ia_gid;
2162
2163 #ifdef CONFIG_CIFS_ACL
2164 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_CIFS_ACL) {
2165 if (uid_valid(uid) || gid_valid(gid)) {
2166 rc = id_mode_to_cifs_acl(inode, full_path, NO_CHANGE_64,
2167 uid, gid);
2168 if (rc) {
2169 cFYI(1, "%s: Setting id failed with error: %d",
2170 __func__, rc);
2171 goto cifs_setattr_exit;
2172 }
2173 }
2174 } else
2175 #endif /* CONFIG_CIFS_ACL */
2176 if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SET_UID))
2177 attrs->ia_valid &= ~(ATTR_UID | ATTR_GID);
2178
2179 /* skip mode change if it's just for clearing setuid/setgid */
2180 if (attrs->ia_valid & (ATTR_KILL_SUID|ATTR_KILL_SGID))
2181 attrs->ia_valid &= ~ATTR_MODE;
2182
2183 if (attrs->ia_valid & ATTR_MODE) {
2184 mode = attrs->ia_mode;
2185 rc = 0;
2186 #ifdef CONFIG_CIFS_ACL
2187 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_CIFS_ACL) {
2188 rc = id_mode_to_cifs_acl(inode, full_path, mode,
2189 INVALID_UID, INVALID_GID);
2190 if (rc) {
2191 cFYI(1, "%s: Setting ACL failed with error: %d",
2192 __func__, rc);
2193 goto cifs_setattr_exit;
2194 }
2195 } else
2196 #endif /* CONFIG_CIFS_ACL */
2197 if (((mode & S_IWUGO) == 0) &&
2198 (cifsInode->cifsAttrs & ATTR_READONLY) == 0) {
2199
2200 dosattr = cifsInode->cifsAttrs | ATTR_READONLY;
2201
2202 /* fix up mode if we're not using dynperm */
2203 if ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DYNPERM) == 0)
2204 attrs->ia_mode = inode->i_mode & ~S_IWUGO;
2205 } else if ((mode & S_IWUGO) &&
2206 (cifsInode->cifsAttrs & ATTR_READONLY)) {
2207
2208 dosattr = cifsInode->cifsAttrs & ~ATTR_READONLY;
2209 /* Attributes of 0 are ignored */
2210 if (dosattr == 0)
2211 dosattr |= ATTR_NORMAL;
2212
2213 /* reset local inode permissions to normal */
2214 if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DYNPERM)) {
2215 attrs->ia_mode &= ~(S_IALLUGO);
2216 if (S_ISDIR(inode->i_mode))
2217 attrs->ia_mode |=
2218 cifs_sb->mnt_dir_mode;
2219 else
2220 attrs->ia_mode |=
2221 cifs_sb->mnt_file_mode;
2222 }
2223 } else if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DYNPERM)) {
2224 /* ignore mode change - ATTR_READONLY hasn't changed */
2225 attrs->ia_valid &= ~ATTR_MODE;
2226 }
2227 }
2228
2229 if (attrs->ia_valid & (ATTR_MTIME|ATTR_ATIME|ATTR_CTIME) ||
2230 ((attrs->ia_valid & ATTR_MODE) && dosattr)) {
2231 rc = cifs_set_file_info(inode, attrs, xid, full_path, dosattr);
2232 /* BB: check for rc = -EOPNOTSUPP and switch to legacy mode */
2233
2234 /* Even if error on time set, no sense failing the call if
2235 the server would set the time to a reasonable value anyway,
2236 and this check ensures that we are not being called from
2237 sys_utimes in which case we ought to fail the call back to
2238 the user when the server rejects the call */
2239 if ((rc) && (attrs->ia_valid &
2240 (ATTR_MODE | ATTR_GID | ATTR_UID | ATTR_SIZE)))
2241 rc = 0;
2242 }
2243
2244 /* do not need local check to inode_check_ok since the server does
2245 that */
2246 if (rc)
2247 goto cifs_setattr_exit;
2248
2249 if ((attrs->ia_valid & ATTR_SIZE) &&
2250 attrs->ia_size != i_size_read(inode))
2251 truncate_setsize(inode, attrs->ia_size);
2252
2253 setattr_copy(inode, attrs);
2254 mark_inode_dirty(inode);
2255
2256 cifs_setattr_exit:
2257 kfree(full_path);
2258 free_xid(xid);
2259 return rc;
2260 }
2261
2262 int
2263 cifs_setattr(struct dentry *direntry, struct iattr *attrs)
2264 {
2265 struct inode *inode = direntry->d_inode;
2266 struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
2267 struct cifs_tcon *pTcon = cifs_sb_master_tcon(cifs_sb);
2268
2269 if (pTcon->unix_ext)
2270 return cifs_setattr_unix(direntry, attrs);
2271
2272 return cifs_setattr_nounix(direntry, attrs);
2273
2274 /* BB: add cifs_setattr_legacy for really old servers */
2275 }
2276
2277 #if 0
2278 void cifs_delete_inode(struct inode *inode)
2279 {
2280 cFYI(1, "In cifs_delete_inode, inode = 0x%p", inode);
2281 /* may have to add back in if and when safe distributed caching of
2282 directories added e.g. via FindNotify */
2283 }
2284 #endif
CJK support for tty framebuffer vt