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 <linux/freezer.h>
26 #include <linux/sched/signal.h>
27 #include <linux/wait_bit.h>
28
29 #include <asm/div64.h>
30 #include "cifsfs.h"
31 #include "cifspdu.h"
32 #include "cifsglob.h"
33 #include "cifsproto.h"
34 #include "cifs_debug.h"
35 #include "cifs_fs_sb.h"
36 #include "cifs_unicode.h"
37 #include "fscache.h"
38
39
cifs_set_ops(struct inode * inode)40 static void cifs_set_ops(struct inode *inode)
41 {
42 struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
43
44 switch (inode->i_mode & S_IFMT) {
45 case S_IFREG:
46 inode->i_op = &cifs_file_inode_ops;
47 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DIRECT_IO) {
48 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_BRL)
49 inode->i_fop = &cifs_file_direct_nobrl_ops;
50 else
51 inode->i_fop = &cifs_file_direct_ops;
52 } else if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_STRICT_IO) {
53 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_BRL)
54 inode->i_fop = &cifs_file_strict_nobrl_ops;
55 else
56 inode->i_fop = &cifs_file_strict_ops;
57 } else if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_BRL)
58 inode->i_fop = &cifs_file_nobrl_ops;
59 else { /* not direct, send byte range locks */
60 inode->i_fop = &cifs_file_ops;
61 }
62
63 /* check if server can support readpages */
64 if (cifs_sb_master_tcon(cifs_sb)->ses->server->maxBuf <
65 PAGE_SIZE + MAX_CIFS_HDR_SIZE)
66 inode->i_data.a_ops = &cifs_addr_ops_smallbuf;
67 else
68 inode->i_data.a_ops = &cifs_addr_ops;
69 break;
70 case S_IFDIR:
71 #ifdef CONFIG_CIFS_DFS_UPCALL
72 if (IS_AUTOMOUNT(inode)) {
73 inode->i_op = &cifs_dfs_referral_inode_operations;
74 } else {
75 #else /* NO DFS support, treat as a directory */
76 {
77 #endif
78 inode->i_op = &cifs_dir_inode_ops;
79 inode->i_fop = &cifs_dir_ops;
80 }
81 break;
82 case S_IFLNK:
83 inode->i_op = &cifs_symlink_inode_ops;
84 break;
85 default:
86 init_special_inode(inode, inode->i_mode, inode->i_rdev);
87 break;
88 }
89 }
90
91 /* check inode attributes against fattr. If they don't match, tag the
92 * inode for cache invalidation
93 */
94 static void
95 cifs_revalidate_cache(struct inode *inode, struct cifs_fattr *fattr)
96 {
97 struct cifsInodeInfo *cifs_i = CIFS_I(inode);
98
99 cifs_dbg(FYI, "%s: revalidating inode %llu\n",
100 __func__, cifs_i->uniqueid);
101
102 if (inode->i_state & I_NEW) {
103 cifs_dbg(FYI, "%s: inode %llu is new\n",
104 __func__, cifs_i->uniqueid);
105 return;
106 }
107
108 /* don't bother with revalidation if we have an oplock */
109 if (CIFS_CACHE_READ(cifs_i)) {
110 cifs_dbg(FYI, "%s: inode %llu is oplocked\n",
111 __func__, cifs_i->uniqueid);
112 return;
113 }
114
115 /* revalidate if mtime or size have changed */
116 if (timespec64_equal(&inode->i_mtime, &fattr->cf_mtime) &&
117 cifs_i->server_eof == fattr->cf_eof) {
118 cifs_dbg(FYI, "%s: inode %llu is unchanged\n",
119 __func__, cifs_i->uniqueid);
120 return;
121 }
122
123 cifs_dbg(FYI, "%s: invalidating inode %llu mapping\n",
124 __func__, cifs_i->uniqueid);
125 set_bit(CIFS_INO_INVALID_MAPPING, &cifs_i->flags);
126 }
127
128 /*
129 * copy nlink to the inode, unless it wasn't provided. Provide
130 * sane values if we don't have an existing one and none was provided
131 */
132 static void
133 cifs_nlink_fattr_to_inode(struct inode *inode, struct cifs_fattr *fattr)
134 {
135 /*
136 * if we're in a situation where we can't trust what we
137 * got from the server (readdir, some non-unix cases)
138 * fake reasonable values
139 */
140 if (fattr->cf_flags & CIFS_FATTR_UNKNOWN_NLINK) {
141 /* only provide fake values on a new inode */
142 if (inode->i_state & I_NEW) {
143 if (fattr->cf_cifsattrs & ATTR_DIRECTORY)
144 set_nlink(inode, 2);
145 else
146 set_nlink(inode, 1);
147 }
148 return;
149 }
150
151 /* we trust the server, so update it */
152 set_nlink(inode, fattr->cf_nlink);
153 }
154
155 /* populate an inode with info from a cifs_fattr struct */
156 void
157 cifs_fattr_to_inode(struct inode *inode, struct cifs_fattr *fattr)
158 {
159 struct cifsInodeInfo *cifs_i = CIFS_I(inode);
160 struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
161
162 cifs_revalidate_cache(inode, fattr);
163
164 spin_lock(&inode->i_lock);
165 /* we do not want atime to be less than mtime, it broke some apps */
166 if (timespec64_compare(&fattr->cf_atime, &fattr->cf_mtime))
167 inode->i_atime = fattr->cf_mtime;
168 else
169 inode->i_atime = fattr->cf_atime;
170 inode->i_mtime = fattr->cf_mtime;
171 inode->i_ctime = fattr->cf_ctime;
172 inode->i_rdev = fattr->cf_rdev;
173 cifs_nlink_fattr_to_inode(inode, fattr);
174 inode->i_uid = fattr->cf_uid;
175 inode->i_gid = fattr->cf_gid;
176
177 /* if dynperm is set, don't clobber existing mode */
178 if (inode->i_state & I_NEW ||
179 !(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DYNPERM))
180 inode->i_mode = fattr->cf_mode;
181
182 cifs_i->cifsAttrs = fattr->cf_cifsattrs;
183
184 if (fattr->cf_flags & CIFS_FATTR_NEED_REVAL)
185 cifs_i->time = 0;
186 else
187 cifs_i->time = jiffies;
188
189 if (fattr->cf_flags & CIFS_FATTR_DELETE_PENDING)
190 set_bit(CIFS_INO_DELETE_PENDING, &cifs_i->flags);
191 else
192 clear_bit(CIFS_INO_DELETE_PENDING, &cifs_i->flags);
193
194 cifs_i->server_eof = fattr->cf_eof;
195 /*
196 * Can't safely change the file size here if the client is writing to
197 * it due to potential races.
198 */
199 if (is_size_safe_to_change(cifs_i, fattr->cf_eof)) {
200 i_size_write(inode, fattr->cf_eof);
201
202 /*
203 * i_blocks is not related to (i_size / i_blksize),
204 * but instead 512 byte (2**9) size is required for
205 * calculating num blocks.
206 */
207 inode->i_blocks = (512 - 1 + fattr->cf_bytes) >> 9;
208 }
209 spin_unlock(&inode->i_lock);
210
211 if (fattr->cf_flags & CIFS_FATTR_DFS_REFERRAL)
212 inode->i_flags |= S_AUTOMOUNT;
213 if (inode->i_state & I_NEW)
214 cifs_set_ops(inode);
215 }
216
217 void
218 cifs_fill_uniqueid(struct super_block *sb, struct cifs_fattr *fattr)
219 {
220 struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
221
222 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM)
223 return;
224
225 fattr->cf_uniqueid = iunique(sb, ROOT_I);
226 }
227
228 /* Fill a cifs_fattr struct with info from FILE_UNIX_BASIC_INFO. */
229 void
230 cifs_unix_basic_to_fattr(struct cifs_fattr *fattr, FILE_UNIX_BASIC_INFO *info,
231 struct cifs_sb_info *cifs_sb)
232 {
233 memset(fattr, 0, sizeof(*fattr));
234 fattr->cf_uniqueid = le64_to_cpu(info->UniqueId);
235 fattr->cf_bytes = le64_to_cpu(info->NumOfBytes);
236 fattr->cf_eof = le64_to_cpu(info->EndOfFile);
237
238 fattr->cf_atime = cifs_NTtimeToUnix(info->LastAccessTime);
239 fattr->cf_mtime = cifs_NTtimeToUnix(info->LastModificationTime);
240 fattr->cf_ctime = cifs_NTtimeToUnix(info->LastStatusChange);
241 /* old POSIX extensions don't get create time */
242
243 fattr->cf_mode = le64_to_cpu(info->Permissions);
244
245 /*
246 * Since we set the inode type below we need to mask off
247 * to avoid strange results if bits set above.
248 */
249 fattr->cf_mode &= ~S_IFMT;
250 switch (le32_to_cpu(info->Type)) {
251 case UNIX_FILE:
252 fattr->cf_mode |= S_IFREG;
253 fattr->cf_dtype = DT_REG;
254 break;
255 case UNIX_SYMLINK:
256 fattr->cf_mode |= S_IFLNK;
257 fattr->cf_dtype = DT_LNK;
258 break;
259 case UNIX_DIR:
260 fattr->cf_mode |= S_IFDIR;
261 fattr->cf_dtype = DT_DIR;
262 break;
263 case UNIX_CHARDEV:
264 fattr->cf_mode |= S_IFCHR;
265 fattr->cf_dtype = DT_CHR;
266 fattr->cf_rdev = MKDEV(le64_to_cpu(info->DevMajor),
267 le64_to_cpu(info->DevMinor) & MINORMASK);
268 break;
269 case UNIX_BLOCKDEV:
270 fattr->cf_mode |= S_IFBLK;
271 fattr->cf_dtype = DT_BLK;
272 fattr->cf_rdev = MKDEV(le64_to_cpu(info->DevMajor),
273 le64_to_cpu(info->DevMinor) & MINORMASK);
274 break;
275 case UNIX_FIFO:
276 fattr->cf_mode |= S_IFIFO;
277 fattr->cf_dtype = DT_FIFO;
278 break;
279 case UNIX_SOCKET:
280 fattr->cf_mode |= S_IFSOCK;
281 fattr->cf_dtype = DT_SOCK;
282 break;
283 default:
284 /* safest to call it a file if we do not know */
285 fattr->cf_mode |= S_IFREG;
286 fattr->cf_dtype = DT_REG;
287 cifs_dbg(FYI, "unknown type %d\n", le32_to_cpu(info->Type));
288 break;
289 }
290
291 fattr->cf_uid = cifs_sb->mnt_uid;
292 if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_OVERR_UID)) {
293 u64 id = le64_to_cpu(info->Uid);
294 if (id < ((uid_t)-1)) {
295 kuid_t uid = make_kuid(&init_user_ns, id);
296 if (uid_valid(uid))
297 fattr->cf_uid = uid;
298 }
299 }
300
301 fattr->cf_gid = cifs_sb->mnt_gid;
302 if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_OVERR_GID)) {
303 u64 id = le64_to_cpu(info->Gid);
304 if (id < ((gid_t)-1)) {
305 kgid_t gid = make_kgid(&init_user_ns, id);
306 if (gid_valid(gid))
307 fattr->cf_gid = gid;
308 }
309 }
310
311 fattr->cf_nlink = le64_to_cpu(info->Nlinks);
312 }
313
314 /*
315 * Fill a cifs_fattr struct with fake inode info.
316 *
317 * Needed to setup cifs_fattr data for the directory which is the
318 * junction to the new submount (ie to setup the fake directory
319 * which represents a DFS referral).
320 */
321 static void
322 cifs_create_dfs_fattr(struct cifs_fattr *fattr, struct super_block *sb)
323 {
324 struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
325
326 cifs_dbg(FYI, "creating fake fattr for DFS referral\n");
327
328 memset(fattr, 0, sizeof(*fattr));
329 fattr->cf_mode = S_IFDIR | S_IXUGO | S_IRWXU;
330 fattr->cf_uid = cifs_sb->mnt_uid;
331 fattr->cf_gid = cifs_sb->mnt_gid;
332 ktime_get_real_ts64(&fattr->cf_mtime);
333 fattr->cf_mtime = timespec64_trunc(fattr->cf_mtime, sb->s_time_gran);
334 fattr->cf_atime = fattr->cf_ctime = fattr->cf_mtime;
335 fattr->cf_nlink = 2;
336 fattr->cf_flags = CIFS_FATTR_DFS_REFERRAL;
337 }
338
339 static int
340 cifs_get_file_info_unix(struct file *filp)
341 {
342 int rc;
343 unsigned int xid;
344 FILE_UNIX_BASIC_INFO find_data;
345 struct cifs_fattr fattr;
346 struct inode *inode = file_inode(filp);
347 struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
348 struct cifsFileInfo *cfile = filp->private_data;
349 struct cifs_tcon *tcon = tlink_tcon(cfile->tlink);
350
351 xid = get_xid();
352 rc = CIFSSMBUnixQFileInfo(xid, tcon, cfile->fid.netfid, &find_data);
353 if (!rc) {
354 cifs_unix_basic_to_fattr(&fattr, &find_data, cifs_sb);
355 } else if (rc == -EREMOTE) {
356 cifs_create_dfs_fattr(&fattr, inode->i_sb);
357 rc = 0;
358 }
359
360 cifs_fattr_to_inode(inode, &fattr);
361 free_xid(xid);
362 return rc;
363 }
364
365 int cifs_get_inode_info_unix(struct inode **pinode,
366 const unsigned char *full_path,
367 struct super_block *sb, unsigned int xid)
368 {
369 int rc;
370 FILE_UNIX_BASIC_INFO find_data;
371 struct cifs_fattr fattr;
372 struct cifs_tcon *tcon;
373 struct tcon_link *tlink;
374 struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
375
376 cifs_dbg(FYI, "Getting info on %s\n", full_path);
377
378 tlink = cifs_sb_tlink(cifs_sb);
379 if (IS_ERR(tlink))
380 return PTR_ERR(tlink);
381 tcon = tlink_tcon(tlink);
382
383 /* could have done a find first instead but this returns more info */
384 rc = CIFSSMBUnixQPathInfo(xid, tcon, full_path, &find_data,
385 cifs_sb->local_nls, cifs_remap(cifs_sb));
386 cifs_put_tlink(tlink);
387
388 if (!rc) {
389 cifs_unix_basic_to_fattr(&fattr, &find_data, cifs_sb);
390 } else if (rc == -EREMOTE) {
391 cifs_create_dfs_fattr(&fattr, sb);
392 rc = 0;
393 } else {
394 return rc;
395 }
396
397 /* check for Minshall+French symlinks */
398 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MF_SYMLINKS) {
399 int tmprc = check_mf_symlink(xid, tcon, cifs_sb, &fattr,
400 full_path);
401 if (tmprc)
402 cifs_dbg(FYI, "check_mf_symlink: %d\n", tmprc);
403 }
404
405 if (*pinode == NULL) {
406 /* get new inode */
407 cifs_fill_uniqueid(sb, &fattr);
408 *pinode = cifs_iget(sb, &fattr);
409 if (!*pinode)
410 rc = -ENOMEM;
411 } else {
412 /* we already have inode, update it */
413
414 /* if uniqueid is different, return error */
415 if (unlikely(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM &&
416 CIFS_I(*pinode)->uniqueid != fattr.cf_uniqueid)) {
417 CIFS_I(*pinode)->time = 0; /* force reval */
418 rc = -ESTALE;
419 goto cgiiu_exit;
420 }
421
422 /* if filetype is different, return error */
423 if (unlikely(((*pinode)->i_mode & S_IFMT) !=
424 (fattr.cf_mode & S_IFMT))) {
425 CIFS_I(*pinode)->time = 0; /* force reval */
426 rc = -ESTALE;
427 goto cgiiu_exit;
428 }
429
430 cifs_fattr_to_inode(*pinode, &fattr);
431 }
432
433 cgiiu_exit:
434 return rc;
435 }
436
437 static int
438 cifs_sfu_type(struct cifs_fattr *fattr, const char *path,
439 struct cifs_sb_info *cifs_sb, unsigned int xid)
440 {
441 int rc;
442 __u32 oplock;
443 struct tcon_link *tlink;
444 struct cifs_tcon *tcon;
445 struct cifs_fid fid;
446 struct cifs_open_parms oparms;
447 struct cifs_io_parms io_parms;
448 char buf[24];
449 unsigned int bytes_read;
450 char *pbuf;
451 int buf_type = CIFS_NO_BUFFER;
452
453 pbuf = buf;
454
455 fattr->cf_mode &= ~S_IFMT;
456
457 if (fattr->cf_eof == 0) {
458 fattr->cf_mode |= S_IFIFO;
459 fattr->cf_dtype = DT_FIFO;
460 return 0;
461 } else if (fattr->cf_eof < 8) {
462 fattr->cf_mode |= S_IFREG;
463 fattr->cf_dtype = DT_REG;
464 return -EINVAL; /* EOPNOTSUPP? */
465 }
466
467 tlink = cifs_sb_tlink(cifs_sb);
468 if (IS_ERR(tlink))
469 return PTR_ERR(tlink);
470 tcon = tlink_tcon(tlink);
471
472 oparms.tcon = tcon;
473 oparms.cifs_sb = cifs_sb;
474 oparms.desired_access = GENERIC_READ;
475 oparms.create_options = CREATE_NOT_DIR;
476 if (backup_cred(cifs_sb))
477 oparms.create_options |= CREATE_OPEN_BACKUP_INTENT;
478 oparms.disposition = FILE_OPEN;
479 oparms.path = path;
480 oparms.fid = &fid;
481 oparms.reconnect = false;
482
483 if (tcon->ses->server->oplocks)
484 oplock = REQ_OPLOCK;
485 else
486 oplock = 0;
487 rc = tcon->ses->server->ops->open(xid, &oparms, &oplock, NULL);
488 if (rc) {
489 cifs_dbg(FYI, "check sfu type of %s, open rc = %d\n", path, rc);
490 cifs_put_tlink(tlink);
491 return rc;
492 }
493
494 /* Read header */
495 io_parms.netfid = fid.netfid;
496 io_parms.pid = current->tgid;
497 io_parms.tcon = tcon;
498 io_parms.offset = 0;
499 io_parms.length = 24;
500
501 rc = tcon->ses->server->ops->sync_read(xid, &fid, &io_parms,
502 &bytes_read, &pbuf, &buf_type);
503 if ((rc == 0) && (bytes_read >= 8)) {
504 if (memcmp("IntxBLK", pbuf, 8) == 0) {
505 cifs_dbg(FYI, "Block device\n");
506 fattr->cf_mode |= S_IFBLK;
507 fattr->cf_dtype = DT_BLK;
508 if (bytes_read == 24) {
509 /* we have enough to decode dev num */
510 __u64 mjr; /* major */
511 __u64 mnr; /* minor */
512 mjr = le64_to_cpu(*(__le64 *)(pbuf+8));
513 mnr = le64_to_cpu(*(__le64 *)(pbuf+16));
514 fattr->cf_rdev = MKDEV(mjr, mnr);
515 }
516 } else if (memcmp("IntxCHR", pbuf, 8) == 0) {
517 cifs_dbg(FYI, "Char device\n");
518 fattr->cf_mode |= S_IFCHR;
519 fattr->cf_dtype = DT_CHR;
520 if (bytes_read == 24) {
521 /* we have enough to decode dev num */
522 __u64 mjr; /* major */
523 __u64 mnr; /* minor */
524 mjr = le64_to_cpu(*(__le64 *)(pbuf+8));
525 mnr = le64_to_cpu(*(__le64 *)(pbuf+16));
526 fattr->cf_rdev = MKDEV(mjr, mnr);
527 }
528 } else if (memcmp("IntxLNK", pbuf, 7) == 0) {
529 cifs_dbg(FYI, "Symlink\n");
530 fattr->cf_mode |= S_IFLNK;
531 fattr->cf_dtype = DT_LNK;
532 } else {
533 fattr->cf_mode |= S_IFREG; /* file? */
534 fattr->cf_dtype = DT_REG;
535 rc = -EOPNOTSUPP;
536 }
537 } else {
538 fattr->cf_mode |= S_IFREG; /* then it is a file */
539 fattr->cf_dtype = DT_REG;
540 rc = -EOPNOTSUPP; /* or some unknown SFU type */
541 }
542
543 tcon->ses->server->ops->close(xid, tcon, &fid);
544 cifs_put_tlink(tlink);
545 return rc;
546 }
547
548 #define SFBITS_MASK (S_ISVTX | S_ISGID | S_ISUID) /* SETFILEBITS valid bits */
549
550 /*
551 * Fetch mode bits as provided by SFU.
552 *
553 * FIXME: Doesn't this clobber the type bit we got from cifs_sfu_type ?
554 */
555 static int cifs_sfu_mode(struct cifs_fattr *fattr, const unsigned char *path,
556 struct cifs_sb_info *cifs_sb, unsigned int xid)
557 {
558 #ifdef CONFIG_CIFS_XATTR
559 ssize_t rc;
560 char ea_value[4];
561 __u32 mode;
562 struct tcon_link *tlink;
563 struct cifs_tcon *tcon;
564
565 tlink = cifs_sb_tlink(cifs_sb);
566 if (IS_ERR(tlink))
567 return PTR_ERR(tlink);
568 tcon = tlink_tcon(tlink);
569
570 if (tcon->ses->server->ops->query_all_EAs == NULL) {
571 cifs_put_tlink(tlink);
572 return -EOPNOTSUPP;
573 }
574
575 rc = tcon->ses->server->ops->query_all_EAs(xid, tcon, path,
576 "SETFILEBITS", ea_value, 4 /* size of buf */,
577 cifs_sb);
578 cifs_put_tlink(tlink);
579 if (rc < 0)
580 return (int)rc;
581 else if (rc > 3) {
582 mode = le32_to_cpu(*((__le32 *)ea_value));
583 fattr->cf_mode &= ~SFBITS_MASK;
584 cifs_dbg(FYI, "special bits 0%o org mode 0%o\n",
585 mode, fattr->cf_mode);
586 fattr->cf_mode = (mode & SFBITS_MASK) | fattr->cf_mode;
587 cifs_dbg(FYI, "special mode bits 0%o\n", mode);
588 }
589
590 return 0;
591 #else
592 return -EOPNOTSUPP;
593 #endif
594 }
595
596 /* Fill a cifs_fattr struct with info from FILE_ALL_INFO */
597 static void
598 cifs_all_info_to_fattr(struct cifs_fattr *fattr, FILE_ALL_INFO *info,
599 struct super_block *sb, bool adjust_tz,
600 bool symlink)
601 {
602 struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
603 struct cifs_tcon *tcon = cifs_sb_master_tcon(cifs_sb);
604
605 memset(fattr, 0, sizeof(*fattr));
606 fattr->cf_cifsattrs = le32_to_cpu(info->Attributes);
607 if (info->DeletePending)
608 fattr->cf_flags |= CIFS_FATTR_DELETE_PENDING;
609
610 if (info->LastAccessTime)
611 fattr->cf_atime = cifs_NTtimeToUnix(info->LastAccessTime);
612 else {
613 ktime_get_real_ts64(&fattr->cf_atime);
614 fattr->cf_atime = timespec64_trunc(fattr->cf_atime, sb->s_time_gran);
615 }
616
617 fattr->cf_ctime = cifs_NTtimeToUnix(info->ChangeTime);
618 fattr->cf_mtime = cifs_NTtimeToUnix(info->LastWriteTime);
619
620 if (adjust_tz) {
621 fattr->cf_ctime.tv_sec += tcon->ses->server->timeAdj;
622 fattr->cf_mtime.tv_sec += tcon->ses->server->timeAdj;
623 }
624
625 fattr->cf_eof = le64_to_cpu(info->EndOfFile);
626 fattr->cf_bytes = le64_to_cpu(info->AllocationSize);
627 fattr->cf_createtime = le64_to_cpu(info->CreationTime);
628
629 fattr->cf_nlink = le32_to_cpu(info->NumberOfLinks);
630
631 if (symlink) {
632 fattr->cf_mode = S_IFLNK;
633 fattr->cf_dtype = DT_LNK;
634 } else if (fattr->cf_cifsattrs & ATTR_DIRECTORY) {
635 fattr->cf_mode = S_IFDIR | cifs_sb->mnt_dir_mode;
636 fattr->cf_dtype = DT_DIR;
637 /*
638 * Server can return wrong NumberOfLinks value for directories
639 * when Unix extensions are disabled - fake it.
640 */
641 if (!tcon->unix_ext)
642 fattr->cf_flags |= CIFS_FATTR_UNKNOWN_NLINK;
643 } else {
644 fattr->cf_mode = S_IFREG | cifs_sb->mnt_file_mode;
645 fattr->cf_dtype = DT_REG;
646
647 /* clear write bits if ATTR_READONLY is set */
648 if (fattr->cf_cifsattrs & ATTR_READONLY)
649 fattr->cf_mode &= ~(S_IWUGO);
650
651 /*
652 * Don't accept zero nlink from non-unix servers unless
653 * delete is pending. Instead mark it as unknown.
654 */
655 if ((fattr->cf_nlink < 1) && !tcon->unix_ext &&
656 !info->DeletePending) {
657 cifs_dbg(1, "bogus file nlink value %u\n",
658 fattr->cf_nlink);
659 fattr->cf_flags |= CIFS_FATTR_UNKNOWN_NLINK;
660 }
661 }
662
663 fattr->cf_uid = cifs_sb->mnt_uid;
664 fattr->cf_gid = cifs_sb->mnt_gid;
665 }
666
667 static int
668 cifs_get_file_info(struct file *filp)
669 {
670 int rc;
671 unsigned int xid;
672 FILE_ALL_INFO find_data;
673 struct cifs_fattr fattr;
674 struct inode *inode = file_inode(filp);
675 struct cifsFileInfo *cfile = filp->private_data;
676 struct cifs_tcon *tcon = tlink_tcon(cfile->tlink);
677 struct TCP_Server_Info *server = tcon->ses->server;
678
679 if (!server->ops->query_file_info)
680 return -ENOSYS;
681
682 xid = get_xid();
683 rc = server->ops->query_file_info(xid, tcon, &cfile->fid, &find_data);
684 switch (rc) {
685 case 0:
686 cifs_all_info_to_fattr(&fattr, &find_data, inode->i_sb, false,
687 false);
688 break;
689 case -EREMOTE:
690 cifs_create_dfs_fattr(&fattr, inode->i_sb);
691 rc = 0;
692 break;
693 case -EOPNOTSUPP:
694 case -EINVAL:
695 /*
696 * FIXME: legacy server -- fall back to path-based call?
697 * for now, just skip revalidating and mark inode for
698 * immediate reval.
699 */
700 rc = 0;
701 CIFS_I(inode)->time = 0;
702 default:
703 goto cgfi_exit;
704 }
705
706 /*
707 * don't bother with SFU junk here -- just mark inode as needing
708 * revalidation.
709 */
710 fattr.cf_uniqueid = CIFS_I(inode)->uniqueid;
711 fattr.cf_flags |= CIFS_FATTR_NEED_REVAL;
712 cifs_fattr_to_inode(inode, &fattr);
713 cgfi_exit:
714 free_xid(xid);
715 return rc;
716 }
717
718 /* Simple function to return a 64 bit hash of string. Rarely called */
719 static __u64 simple_hashstr(const char *str)
720 {
721 const __u64 hash_mult = 1125899906842597ULL; /* a big enough prime */
722 __u64 hash = 0;
723
724 while (*str)
725 hash = (hash + (__u64) *str++) * hash_mult;
726
727 return hash;
728 }
729
730 int
731 cifs_get_inode_info(struct inode **inode, const char *full_path,
732 FILE_ALL_INFO *data, struct super_block *sb, int xid,
733 const struct cifs_fid *fid)
734 {
735 __u16 srchflgs;
736 int rc = 0, tmprc = ENOSYS;
737 struct cifs_tcon *tcon;
738 struct TCP_Server_Info *server;
739 struct tcon_link *tlink;
740 struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
741 char *buf = NULL;
742 bool adjust_tz = false;
743 struct cifs_fattr fattr;
744 struct cifs_search_info *srchinf = NULL;
745 bool symlink = false;
746
747 tlink = cifs_sb_tlink(cifs_sb);
748 if (IS_ERR(tlink))
749 return PTR_ERR(tlink);
750 tcon = tlink_tcon(tlink);
751 server = tcon->ses->server;
752
753 cifs_dbg(FYI, "Getting info on %s\n", full_path);
754
755 if ((data == NULL) && (*inode != NULL)) {
756 if (CIFS_CACHE_READ(CIFS_I(*inode)) &&
757 CIFS_I(*inode)->time != 0) {
758 cifs_dbg(FYI, "No need to revalidate cached inode sizes\n");
759 goto cgii_exit;
760 }
761 }
762
763 /* if inode info is not passed, get it from server */
764 if (data == NULL) {
765 if (!server->ops->query_path_info) {
766 rc = -ENOSYS;
767 goto cgii_exit;
768 }
769 buf = kmalloc(sizeof(FILE_ALL_INFO), GFP_KERNEL);
770 if (buf == NULL) {
771 rc = -ENOMEM;
772 goto cgii_exit;
773 }
774 data = (FILE_ALL_INFO *)buf;
775 rc = server->ops->query_path_info(xid, tcon, cifs_sb, full_path,
776 data, &adjust_tz, &symlink);
777 }
778
779 if (!rc) {
780 cifs_all_info_to_fattr(&fattr, data, sb, adjust_tz,
781 symlink);
782 } else if (rc == -EREMOTE) {
783 cifs_create_dfs_fattr(&fattr, sb);
784 rc = 0;
785 } else if ((rc == -EACCES) && backup_cred(cifs_sb) &&
786 (strcmp(server->vals->version_string, SMB1_VERSION_STRING)
787 == 0)) {
788 /*
789 * For SMB2 and later the backup intent flag is already
790 * sent if needed on open and there is no path based
791 * FindFirst operation to use to retry with
792 */
793
794 srchinf = kzalloc(sizeof(struct cifs_search_info),
795 GFP_KERNEL);
796 if (srchinf == NULL) {
797 rc = -ENOMEM;
798 goto cgii_exit;
799 }
800
801 srchinf->endOfSearch = false;
802 if (tcon->unix_ext)
803 srchinf->info_level = SMB_FIND_FILE_UNIX;
804 else if ((tcon->ses->capabilities &
805 tcon->ses->server->vals->cap_nt_find) == 0)
806 srchinf->info_level = SMB_FIND_FILE_INFO_STANDARD;
807 else if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM)
808 srchinf->info_level = SMB_FIND_FILE_ID_FULL_DIR_INFO;
809 else /* no srvino useful for fallback to some netapp */
810 srchinf->info_level = SMB_FIND_FILE_DIRECTORY_INFO;
811
812 srchflgs = CIFS_SEARCH_CLOSE_ALWAYS |
813 CIFS_SEARCH_CLOSE_AT_END |
814 CIFS_SEARCH_BACKUP_SEARCH;
815
816 rc = CIFSFindFirst(xid, tcon, full_path,
817 cifs_sb, NULL, srchflgs, srchinf, false);
818 if (!rc) {
819 data = (FILE_ALL_INFO *)srchinf->srch_entries_start;
820
821 cifs_dir_info_to_fattr(&fattr,
822 (FILE_DIRECTORY_INFO *)data, cifs_sb);
823 fattr.cf_uniqueid = le64_to_cpu(
824 ((SEARCH_ID_FULL_DIR_INFO *)data)->UniqueId);
825
826 cifs_buf_release(srchinf->ntwrk_buf_start);
827 }
828 kfree(srchinf);
829 if (rc)
830 goto cgii_exit;
831 } else
832 goto cgii_exit;
833
834 /*
835 * If an inode wasn't passed in, then get the inode number
836 *
837 * Is an i_ino of zero legal? Can we use that to check if the server
838 * supports returning inode numbers? Are there other sanity checks we
839 * can use to ensure that the server is really filling in that field?
840 */
841 if (*inode == NULL) {
842 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM) {
843 if (server->ops->get_srv_inum)
844 tmprc = server->ops->get_srv_inum(xid,
845 tcon, cifs_sb, full_path,
846 &fattr.cf_uniqueid, data);
847 if (tmprc) {
848 cifs_dbg(FYI, "GetSrvInodeNum rc %d\n",
849 tmprc);
850 fattr.cf_uniqueid = iunique(sb, ROOT_I);
851 cifs_autodisable_serverino(cifs_sb);
852 } else if ((fattr.cf_uniqueid == 0) &&
853 strlen(full_path) == 0) {
854 /* some servers ret bad root ino ie 0 */
855 cifs_dbg(FYI, "Invalid (0) inodenum\n");
856 fattr.cf_flags |=
857 CIFS_FATTR_FAKE_ROOT_INO;
858 fattr.cf_uniqueid =
859 simple_hashstr(tcon->treeName);
860 }
861 } else
862 fattr.cf_uniqueid = iunique(sb, ROOT_I);
863 } else {
864 if ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM)
865 && server->ops->get_srv_inum) {
866 /*
867 * Pass a NULL tcon to ensure we don't make a round
868 * trip to the server. This only works for SMB2+.
869 */
870 tmprc = server->ops->get_srv_inum(xid,
871 NULL, cifs_sb, full_path,
872 &fattr.cf_uniqueid, data);
873 if (tmprc)
874 fattr.cf_uniqueid = CIFS_I(*inode)->uniqueid;
875 else if ((fattr.cf_uniqueid == 0) &&
876 strlen(full_path) == 0) {
877 /*
878 * Reuse existing root inode num since
879 * inum zero for root causes ls of . and .. to
880 * not be returned
881 */
882 cifs_dbg(FYI, "Srv ret 0 inode num for root\n");
883 fattr.cf_uniqueid = CIFS_I(*inode)->uniqueid;
884 }
885 } else
886 fattr.cf_uniqueid = CIFS_I(*inode)->uniqueid;
887 }
888
889 /* query for SFU type info if supported and needed */
890 if (fattr.cf_cifsattrs & ATTR_SYSTEM &&
891 cifs_sb->mnt_cifs_flags & CIFS_MOUNT_UNX_EMUL) {
892 tmprc = cifs_sfu_type(&fattr, full_path, cifs_sb, xid);
893 if (tmprc)
894 cifs_dbg(FYI, "cifs_sfu_type failed: %d\n", tmprc);
895 }
896
897 /* fill in 0777 bits from ACL */
898 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MODE_FROM_SID) {
899 rc = cifs_acl_to_fattr(cifs_sb, &fattr, *inode, true,
900 full_path, fid);
901 if (rc) {
902 cifs_dbg(FYI, "%s: Get mode from SID failed. rc=%d\n",
903 __func__, rc);
904 goto cgii_exit;
905 }
906 } else if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_CIFS_ACL) {
907 rc = cifs_acl_to_fattr(cifs_sb, &fattr, *inode, false,
908 full_path, fid);
909 if (rc) {
910 cifs_dbg(FYI, "%s: Getting ACL failed with error: %d\n",
911 __func__, rc);
912 goto cgii_exit;
913 }
914 }
915
916 /* fill in remaining high mode bits e.g. SUID, VTX */
917 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_UNX_EMUL)
918 cifs_sfu_mode(&fattr, full_path, cifs_sb, xid);
919
920 /* check for Minshall+French symlinks */
921 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MF_SYMLINKS) {
922 tmprc = check_mf_symlink(xid, tcon, cifs_sb, &fattr,
923 full_path);
924 if (tmprc)
925 cifs_dbg(FYI, "check_mf_symlink: %d\n", tmprc);
926 }
927
928 if (!*inode) {
929 *inode = cifs_iget(sb, &fattr);
930 if (!*inode)
931 rc = -ENOMEM;
932 } else {
933 /* we already have inode, update it */
934
935 /* if uniqueid is different, return error */
936 if (unlikely(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM &&
937 CIFS_I(*inode)->uniqueid != fattr.cf_uniqueid)) {
938 CIFS_I(*inode)->time = 0; /* force reval */
939 rc = -ESTALE;
940 goto cgii_exit;
941 }
942
943 /* if filetype is different, return error */
944 if (unlikely(((*inode)->i_mode & S_IFMT) !=
945 (fattr.cf_mode & S_IFMT))) {
946 CIFS_I(*inode)->time = 0; /* force reval */
947 rc = -ESTALE;
948 goto cgii_exit;
949 }
950
951 cifs_fattr_to_inode(*inode, &fattr);
952 }
953
954 cgii_exit:
955 if ((*inode) && ((*inode)->i_ino == 0))
956 cifs_dbg(FYI, "inode number of zero returned\n");
957
958 kfree(buf);
959 cifs_put_tlink(tlink);
960 return rc;
961 }
962
963 static const struct inode_operations cifs_ipc_inode_ops = {
964 .lookup = cifs_lookup,
965 };
966
967 static int
968 cifs_find_inode(struct inode *inode, void *opaque)
969 {
970 struct cifs_fattr *fattr = (struct cifs_fattr *) opaque;
971
972 /* don't match inode with different uniqueid */
973 if (CIFS_I(inode)->uniqueid != fattr->cf_uniqueid)
974 return 0;
975
976 /* use createtime like an i_generation field */
977 if (CIFS_I(inode)->createtime != fattr->cf_createtime)
978 return 0;
979
980 /* don't match inode of different type */
981 if ((inode->i_mode & S_IFMT) != (fattr->cf_mode & S_IFMT))
982 return 0;
983
984 /* if it's not a directory or has no dentries, then flag it */
985 if (S_ISDIR(inode->i_mode) && !hlist_empty(&inode->i_dentry))
986 fattr->cf_flags |= CIFS_FATTR_INO_COLLISION;
987
988 return 1;
989 }
990
991 static int
992 cifs_init_inode(struct inode *inode, void *opaque)
993 {
994 struct cifs_fattr *fattr = (struct cifs_fattr *) opaque;
995
996 CIFS_I(inode)->uniqueid = fattr->cf_uniqueid;
997 CIFS_I(inode)->createtime = fattr->cf_createtime;
998 return 0;
999 }
1000
1001 /*
1002 * walk dentry list for an inode and report whether it has aliases that
1003 * are hashed. We use this to determine if a directory inode can actually
1004 * be used.
1005 */
1006 static bool
1007 inode_has_hashed_dentries(struct inode *inode)
1008 {
1009 struct dentry *dentry;
1010
1011 spin_lock(&inode->i_lock);
1012 hlist_for_each_entry(dentry, &inode->i_dentry, d_u.d_alias) {
1013 if (!d_unhashed(dentry) || IS_ROOT(dentry)) {
1014 spin_unlock(&inode->i_lock);
1015 return true;
1016 }
1017 }
1018 spin_unlock(&inode->i_lock);
1019 return false;
1020 }
1021
1022 /* Given fattrs, get a corresponding inode */
1023 struct inode *
1024 cifs_iget(struct super_block *sb, struct cifs_fattr *fattr)
1025 {
1026 unsigned long hash;
1027 struct inode *inode;
1028
1029 retry_iget5_locked:
1030 cifs_dbg(FYI, "looking for uniqueid=%llu\n", fattr->cf_uniqueid);
1031
1032 /* hash down to 32-bits on 32-bit arch */
1033 hash = cifs_uniqueid_to_ino_t(fattr->cf_uniqueid);
1034
1035 inode = iget5_locked(sb, hash, cifs_find_inode, cifs_init_inode, fattr);
1036 if (inode) {
1037 /* was there a potentially problematic inode collision? */
1038 if (fattr->cf_flags & CIFS_FATTR_INO_COLLISION) {
1039 fattr->cf_flags &= ~CIFS_FATTR_INO_COLLISION;
1040
1041 if (inode_has_hashed_dentries(inode)) {
1042 cifs_autodisable_serverino(CIFS_SB(sb));
1043 iput(inode);
1044 fattr->cf_uniqueid = iunique(sb, ROOT_I);
1045 goto retry_iget5_locked;
1046 }
1047 }
1048
1049 cifs_fattr_to_inode(inode, fattr);
1050 if (sb->s_flags & SB_NOATIME)
1051 inode->i_flags |= S_NOATIME | S_NOCMTIME;
1052 if (inode->i_state & I_NEW) {
1053 inode->i_ino = hash;
1054 #ifdef CONFIG_CIFS_FSCACHE
1055 /* initialize per-inode cache cookie pointer */
1056 CIFS_I(inode)->fscache = NULL;
1057 #endif
1058 unlock_new_inode(inode);
1059 }
1060 }
1061
1062 return inode;
1063 }
1064
1065 /* gets root inode */
1066 struct inode *cifs_root_iget(struct super_block *sb)
1067 {
1068 unsigned int xid;
1069 struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
1070 struct inode *inode = NULL;
1071 long rc;
1072 struct cifs_tcon *tcon = cifs_sb_master_tcon(cifs_sb);
1073 char *path = NULL;
1074 int len;
1075
1076 if ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_USE_PREFIX_PATH)
1077 && cifs_sb->prepath) {
1078 len = strlen(cifs_sb->prepath);
1079 path = kzalloc(len + 2 /* leading sep + null */, GFP_KERNEL);
1080 if (path == NULL)
1081 return ERR_PTR(-ENOMEM);
1082 path[0] = '/';
1083 memcpy(path+1, cifs_sb->prepath, len);
1084 } else {
1085 path = kstrdup("", GFP_KERNEL);
1086 if (path == NULL)
1087 return ERR_PTR(-ENOMEM);
1088 }
1089
1090 xid = get_xid();
1091 if (tcon->unix_ext) {
1092 rc = cifs_get_inode_info_unix(&inode, path, sb, xid);
1093 /* some servers mistakenly claim POSIX support */
1094 if (rc != -EOPNOTSUPP)
1095 goto iget_no_retry;
1096 cifs_dbg(VFS, "server does not support POSIX extensions");
1097 tcon->unix_ext = false;
1098 }
1099
1100 convert_delimiter(path, CIFS_DIR_SEP(cifs_sb));
1101 rc = cifs_get_inode_info(&inode, path, NULL, sb, xid, NULL);
1102
1103 iget_no_retry:
1104 if (!inode) {
1105 inode = ERR_PTR(rc);
1106 goto out;
1107 }
1108
1109 #ifdef CONFIG_CIFS_FSCACHE
1110 /* populate tcon->resource_id */
1111 tcon->resource_id = CIFS_I(inode)->uniqueid;
1112 #endif
1113
1114 if (rc && tcon->pipe) {
1115 cifs_dbg(FYI, "ipc connection - fake read inode\n");
1116 spin_lock(&inode->i_lock);
1117 inode->i_mode |= S_IFDIR;
1118 set_nlink(inode, 2);
1119 inode->i_op = &cifs_ipc_inode_ops;
1120 inode->i_fop = &simple_dir_operations;
1121 inode->i_uid = cifs_sb->mnt_uid;
1122 inode->i_gid = cifs_sb->mnt_gid;
1123 spin_unlock(&inode->i_lock);
1124 } else if (rc) {
1125 iget_failed(inode);
1126 inode = ERR_PTR(rc);
1127 }
1128
1129 out:
1130 kfree(path);
1131 free_xid(xid);
1132 return inode;
1133 }
1134
1135 int
1136 cifs_set_file_info(struct inode *inode, struct iattr *attrs, unsigned int xid,
1137 char *full_path, __u32 dosattr)
1138 {
1139 bool set_time = false;
1140 struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
1141 struct TCP_Server_Info *server;
1142 FILE_BASIC_INFO info_buf;
1143
1144 if (attrs == NULL)
1145 return -EINVAL;
1146
1147 server = cifs_sb_master_tcon(cifs_sb)->ses->server;
1148 if (!server->ops->set_file_info)
1149 return -ENOSYS;
1150
1151 info_buf.Pad = 0;
1152
1153 if (attrs->ia_valid & ATTR_ATIME) {
1154 set_time = true;
1155 info_buf.LastAccessTime =
1156 cpu_to_le64(cifs_UnixTimeToNT(attrs->ia_atime));
1157 } else
1158 info_buf.LastAccessTime = 0;
1159
1160 if (attrs->ia_valid & ATTR_MTIME) {
1161 set_time = true;
1162 info_buf.LastWriteTime =
1163 cpu_to_le64(cifs_UnixTimeToNT(attrs->ia_mtime));
1164 } else
1165 info_buf.LastWriteTime = 0;
1166
1167 /*
1168 * Samba throws this field away, but windows may actually use it.
1169 * Do not set ctime unless other time stamps are changed explicitly
1170 * (i.e. by utimes()) since we would then have a mix of client and
1171 * server times.
1172 */
1173 if (set_time && (attrs->ia_valid & ATTR_CTIME)) {
1174 cifs_dbg(FYI, "CIFS - CTIME changed\n");
1175 info_buf.ChangeTime =
1176 cpu_to_le64(cifs_UnixTimeToNT(attrs->ia_ctime));
1177 } else
1178 info_buf.ChangeTime = 0;
1179
1180 info_buf.CreationTime = 0; /* don't change */
1181 info_buf.Attributes = cpu_to_le32(dosattr);
1182
1183 return server->ops->set_file_info(inode, full_path, &info_buf, xid);
1184 }
1185
1186 /*
1187 * Open the given file (if it isn't already), set the DELETE_ON_CLOSE bit
1188 * and rename it to a random name that hopefully won't conflict with
1189 * anything else.
1190 */
1191 int
1192 cifs_rename_pending_delete(const char *full_path, struct dentry *dentry,
1193 const unsigned int xid)
1194 {
1195 int oplock = 0;
1196 int rc;
1197 struct cifs_fid fid;
1198 struct cifs_open_parms oparms;
1199 struct inode *inode = d_inode(dentry);
1200 struct cifsInodeInfo *cifsInode = CIFS_I(inode);
1201 struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
1202 struct tcon_link *tlink;
1203 struct cifs_tcon *tcon;
1204 __u32 dosattr, origattr;
1205 FILE_BASIC_INFO *info_buf = NULL;
1206
1207 tlink = cifs_sb_tlink(cifs_sb);
1208 if (IS_ERR(tlink))
1209 return PTR_ERR(tlink);
1210 tcon = tlink_tcon(tlink);
1211
1212 /*
1213 * We cannot rename the file if the server doesn't support
1214 * CAP_INFOLEVEL_PASSTHRU
1215 */
1216 if (!(tcon->ses->capabilities & CAP_INFOLEVEL_PASSTHRU)) {
1217 rc = -EBUSY;
1218 goto out;
1219 }
1220
1221 oparms.tcon = tcon;
1222 oparms.cifs_sb = cifs_sb;
1223 oparms.desired_access = DELETE | FILE_WRITE_ATTRIBUTES;
1224 oparms.create_options = CREATE_NOT_DIR;
1225 oparms.disposition = FILE_OPEN;
1226 oparms.path = full_path;
1227 oparms.fid = &fid;
1228 oparms.reconnect = false;
1229
1230 rc = CIFS_open(xid, &oparms, &oplock, NULL);
1231 if (rc != 0)
1232 goto out;
1233
1234 origattr = cifsInode->cifsAttrs;
1235 if (origattr == 0)
1236 origattr |= ATTR_NORMAL;
1237
1238 dosattr = origattr & ~ATTR_READONLY;
1239 if (dosattr == 0)
1240 dosattr |= ATTR_NORMAL;
1241 dosattr |= ATTR_HIDDEN;
1242
1243 /* set ATTR_HIDDEN and clear ATTR_READONLY, but only if needed */
1244 if (dosattr != origattr) {
1245 info_buf = kzalloc(sizeof(*info_buf), GFP_KERNEL);
1246 if (info_buf == NULL) {
1247 rc = -ENOMEM;
1248 goto out_close;
1249 }
1250 info_buf->Attributes = cpu_to_le32(dosattr);
1251 rc = CIFSSMBSetFileInfo(xid, tcon, info_buf, fid.netfid,
1252 current->tgid);
1253 /* although we would like to mark the file hidden
1254 if that fails we will still try to rename it */
1255 if (!rc)
1256 cifsInode->cifsAttrs = dosattr;
1257 else
1258 dosattr = origattr; /* since not able to change them */
1259 }
1260
1261 /* rename the file */
1262 rc = CIFSSMBRenameOpenFile(xid, tcon, fid.netfid, NULL,
1263 cifs_sb->local_nls,
1264 cifs_remap(cifs_sb));
1265 if (rc != 0) {
1266 rc = -EBUSY;
1267 goto undo_setattr;
1268 }
1269
1270 /* try to set DELETE_ON_CLOSE */
1271 if (!test_bit(CIFS_INO_DELETE_PENDING, &cifsInode->flags)) {
1272 rc = CIFSSMBSetFileDisposition(xid, tcon, true, fid.netfid,
1273 current->tgid);
1274 /*
1275 * some samba versions return -ENOENT when we try to set the
1276 * file disposition here. Likely a samba bug, but work around
1277 * it for now. This means that some cifsXXX files may hang
1278 * around after they shouldn't.
1279 *
1280 * BB: remove this hack after more servers have the fix
1281 */
1282 if (rc == -ENOENT)
1283 rc = 0;
1284 else if (rc != 0) {
1285 rc = -EBUSY;
1286 goto undo_rename;
1287 }
1288 set_bit(CIFS_INO_DELETE_PENDING, &cifsInode->flags);
1289 }
1290
1291 out_close:
1292 CIFSSMBClose(xid, tcon, fid.netfid);
1293 out:
1294 kfree(info_buf);
1295 cifs_put_tlink(tlink);
1296 return rc;
1297
1298 /*
1299 * reset everything back to the original state. Don't bother
1300 * dealing with errors here since we can't do anything about
1301 * them anyway.
1302 */
1303 undo_rename:
1304 CIFSSMBRenameOpenFile(xid, tcon, fid.netfid, dentry->d_name.name,
1305 cifs_sb->local_nls, cifs_remap(cifs_sb));
1306 undo_setattr:
1307 if (dosattr != origattr) {
1308 info_buf->Attributes = cpu_to_le32(origattr);
1309 if (!CIFSSMBSetFileInfo(xid, tcon, info_buf, fid.netfid,
1310 current->tgid))
1311 cifsInode->cifsAttrs = origattr;
1312 }
1313
1314 goto out_close;
1315 }
1316
1317 /* copied from fs/nfs/dir.c with small changes */
1318 static void
1319 cifs_drop_nlink(struct inode *inode)
1320 {
1321 spin_lock(&inode->i_lock);
1322 if (inode->i_nlink > 0)
1323 drop_nlink(inode);
1324 spin_unlock(&inode->i_lock);
1325 }
1326
1327 /*
1328 * If d_inode(dentry) is null (usually meaning the cached dentry
1329 * is a negative dentry) then we would attempt a standard SMB delete, but
1330 * if that fails we can not attempt the fall back mechanisms on EACCES
1331 * but will return the EACCES to the caller. Note that the VFS does not call
1332 * unlink on negative dentries currently.
1333 */
1334 int cifs_unlink(struct inode *dir, struct dentry *dentry)
1335 {
1336 int rc = 0;
1337 unsigned int xid;
1338 char *full_path = NULL;
1339 struct inode *inode = d_inode(dentry);
1340 struct cifsInodeInfo *cifs_inode;
1341 struct super_block *sb = dir->i_sb;
1342 struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
1343 struct tcon_link *tlink;
1344 struct cifs_tcon *tcon;
1345 struct TCP_Server_Info *server;
1346 struct iattr *attrs = NULL;
1347 __u32 dosattr = 0, origattr = 0;
1348
1349 cifs_dbg(FYI, "cifs_unlink, dir=0x%p, dentry=0x%p\n", dir, dentry);
1350
1351 tlink = cifs_sb_tlink(cifs_sb);
1352 if (IS_ERR(tlink))
1353 return PTR_ERR(tlink);
1354 tcon = tlink_tcon(tlink);
1355 server = tcon->ses->server;
1356
1357 xid = get_xid();
1358
1359 /* Unlink can be called from rename so we can not take the
1360 * sb->s_vfs_rename_mutex here */
1361 full_path = build_path_from_dentry(dentry);
1362 if (full_path == NULL) {
1363 rc = -ENOMEM;
1364 goto unlink_out;
1365 }
1366
1367 if (cap_unix(tcon->ses) && (CIFS_UNIX_POSIX_PATH_OPS_CAP &
1368 le64_to_cpu(tcon->fsUnixInfo.Capability))) {
1369 rc = CIFSPOSIXDelFile(xid, tcon, full_path,
1370 SMB_POSIX_UNLINK_FILE_TARGET, cifs_sb->local_nls,
1371 cifs_remap(cifs_sb));
1372 cifs_dbg(FYI, "posix del rc %d\n", rc);
1373 if ((rc == 0) || (rc == -ENOENT))
1374 goto psx_del_no_retry;
1375 }
1376
1377 retry_std_delete:
1378 if (!server->ops->unlink) {
1379 rc = -ENOSYS;
1380 goto psx_del_no_retry;
1381 }
1382
1383 rc = server->ops->unlink(xid, tcon, full_path, cifs_sb);
1384
1385 psx_del_no_retry:
1386 if (!rc) {
1387 if (inode)
1388 cifs_drop_nlink(inode);
1389 } else if (rc == -ENOENT) {
1390 d_drop(dentry);
1391 } else if (rc == -EBUSY) {
1392 if (server->ops->rename_pending_delete) {
1393 rc = server->ops->rename_pending_delete(full_path,
1394 dentry, xid);
1395 if (rc == 0)
1396 cifs_drop_nlink(inode);
1397 }
1398 } else if ((rc == -EACCES) && (dosattr == 0) && inode) {
1399 attrs = kzalloc(sizeof(*attrs), GFP_KERNEL);
1400 if (attrs == NULL) {
1401 rc = -ENOMEM;
1402 goto out_reval;
1403 }
1404
1405 /* try to reset dos attributes */
1406 cifs_inode = CIFS_I(inode);
1407 origattr = cifs_inode->cifsAttrs;
1408 if (origattr == 0)
1409 origattr |= ATTR_NORMAL;
1410 dosattr = origattr & ~ATTR_READONLY;
1411 if (dosattr == 0)
1412 dosattr |= ATTR_NORMAL;
1413 dosattr |= ATTR_HIDDEN;
1414
1415 rc = cifs_set_file_info(inode, attrs, xid, full_path, dosattr);
1416 if (rc != 0)
1417 goto out_reval;
1418
1419 goto retry_std_delete;
1420 }
1421
1422 /* undo the setattr if we errored out and it's needed */
1423 if (rc != 0 && dosattr != 0)
1424 cifs_set_file_info(inode, attrs, xid, full_path, origattr);
1425
1426 out_reval:
1427 if (inode) {
1428 cifs_inode = CIFS_I(inode);
1429 cifs_inode->time = 0; /* will force revalidate to get info
1430 when needed */
1431 inode->i_ctime = current_time(inode);
1432 }
1433 dir->i_ctime = dir->i_mtime = current_time(dir);
1434 cifs_inode = CIFS_I(dir);
1435 CIFS_I(dir)->time = 0; /* force revalidate of dir as well */
1436 unlink_out:
1437 kfree(full_path);
1438 kfree(attrs);
1439 free_xid(xid);
1440 cifs_put_tlink(tlink);
1441 return rc;
1442 }
1443
1444 static int
1445 cifs_mkdir_qinfo(struct inode *parent, struct dentry *dentry, umode_t mode,
1446 const char *full_path, struct cifs_sb_info *cifs_sb,
1447 struct cifs_tcon *tcon, const unsigned int xid)
1448 {
1449 int rc = 0;
1450 struct inode *inode = NULL;
1451
1452 if (tcon->unix_ext)
1453 rc = cifs_get_inode_info_unix(&inode, full_path, parent->i_sb,
1454 xid);
1455 else
1456 rc = cifs_get_inode_info(&inode, full_path, NULL, parent->i_sb,
1457 xid, NULL);
1458
1459 if (rc)
1460 return rc;
1461
1462 /*
1463 * setting nlink not necessary except in cases where we failed to get it
1464 * from the server or was set bogus. Also, since this is a brand new
1465 * inode, no need to grab the i_lock before setting the i_nlink.
1466 */
1467 if (inode->i_nlink < 2)
1468 set_nlink(inode, 2);
1469 mode &= ~current_umask();
1470 /* must turn on setgid bit if parent dir has it */
1471 if (parent->i_mode & S_ISGID)
1472 mode |= S_ISGID;
1473
1474 if (tcon->unix_ext) {
1475 struct cifs_unix_set_info_args args = {
1476 .mode = mode,
1477 .ctime = NO_CHANGE_64,
1478 .atime = NO_CHANGE_64,
1479 .mtime = NO_CHANGE_64,
1480 .device = 0,
1481 };
1482 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SET_UID) {
1483 args.uid = current_fsuid();
1484 if (parent->i_mode & S_ISGID)
1485 args.gid = parent->i_gid;
1486 else
1487 args.gid = current_fsgid();
1488 } else {
1489 args.uid = INVALID_UID; /* no change */
1490 args.gid = INVALID_GID; /* no change */
1491 }
1492 CIFSSMBUnixSetPathInfo(xid, tcon, full_path, &args,
1493 cifs_sb->local_nls,
1494 cifs_remap(cifs_sb));
1495 } else {
1496 struct TCP_Server_Info *server = tcon->ses->server;
1497 if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_CIFS_ACL) &&
1498 (mode & S_IWUGO) == 0 && server->ops->mkdir_setinfo)
1499 server->ops->mkdir_setinfo(inode, full_path, cifs_sb,
1500 tcon, xid);
1501 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DYNPERM)
1502 inode->i_mode = (mode | S_IFDIR);
1503
1504 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SET_UID) {
1505 inode->i_uid = current_fsuid();
1506 if (inode->i_mode & S_ISGID)
1507 inode->i_gid = parent->i_gid;
1508 else
1509 inode->i_gid = current_fsgid();
1510 }
1511 }
1512 d_instantiate(dentry, inode);
1513 return rc;
1514 }
1515
1516 static int
1517 cifs_posix_mkdir(struct inode *inode, struct dentry *dentry, umode_t mode,
1518 const char *full_path, struct cifs_sb_info *cifs_sb,
1519 struct cifs_tcon *tcon, const unsigned int xid)
1520 {
1521 int rc = 0;
1522 u32 oplock = 0;
1523 FILE_UNIX_BASIC_INFO *info = NULL;
1524 struct inode *newinode = NULL;
1525 struct cifs_fattr fattr;
1526
1527 info = kzalloc(sizeof(FILE_UNIX_BASIC_INFO), GFP_KERNEL);
1528 if (info == NULL) {
1529 rc = -ENOMEM;
1530 goto posix_mkdir_out;
1531 }
1532
1533 mode &= ~current_umask();
1534 rc = CIFSPOSIXCreate(xid, tcon, SMB_O_DIRECTORY | SMB_O_CREAT, mode,
1535 NULL /* netfid */, info, &oplock, full_path,
1536 cifs_sb->local_nls, cifs_remap(cifs_sb));
1537 if (rc == -EOPNOTSUPP)
1538 goto posix_mkdir_out;
1539 else if (rc) {
1540 cifs_dbg(FYI, "posix mkdir returned 0x%x\n", rc);
1541 d_drop(dentry);
1542 goto posix_mkdir_out;
1543 }
1544
1545 if (info->Type == cpu_to_le32(-1))
1546 /* no return info, go query for it */
1547 goto posix_mkdir_get_info;
1548 /*
1549 * BB check (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SET_UID ) to see if
1550 * need to set uid/gid.
1551 */
1552
1553 cifs_unix_basic_to_fattr(&fattr, info, cifs_sb);
1554 cifs_fill_uniqueid(inode->i_sb, &fattr);
1555 newinode = cifs_iget(inode->i_sb, &fattr);
1556 if (!newinode)
1557 goto posix_mkdir_get_info;
1558
1559 d_instantiate(dentry, newinode);
1560
1561 #ifdef CONFIG_CIFS_DEBUG2
1562 cifs_dbg(FYI, "instantiated dentry %p %pd to inode %p\n",
1563 dentry, dentry, newinode);
1564
1565 if (newinode->i_nlink != 2)
1566 cifs_dbg(FYI, "unexpected number of links %d\n",
1567 newinode->i_nlink);
1568 #endif
1569
1570 posix_mkdir_out:
1571 kfree(info);
1572 return rc;
1573 posix_mkdir_get_info:
1574 rc = cifs_mkdir_qinfo(inode, dentry, mode, full_path, cifs_sb, tcon,
1575 xid);
1576 goto posix_mkdir_out;
1577 }
1578
1579 int cifs_mkdir(struct inode *inode, struct dentry *direntry, umode_t mode)
1580 {
1581 int rc = 0;
1582 unsigned int xid;
1583 struct cifs_sb_info *cifs_sb;
1584 struct tcon_link *tlink;
1585 struct cifs_tcon *tcon;
1586 struct TCP_Server_Info *server;
1587 char *full_path;
1588
1589 cifs_dbg(FYI, "In cifs_mkdir, mode = 0x%hx inode = 0x%p\n",
1590 mode, inode);
1591
1592 cifs_sb = CIFS_SB(inode->i_sb);
1593 tlink = cifs_sb_tlink(cifs_sb);
1594 if (IS_ERR(tlink))
1595 return PTR_ERR(tlink);
1596 tcon = tlink_tcon(tlink);
1597
1598 xid = get_xid();
1599
1600 full_path = build_path_from_dentry(direntry);
1601 if (full_path == NULL) {
1602 rc = -ENOMEM;
1603 goto mkdir_out;
1604 }
1605
1606 server = tcon->ses->server;
1607
1608 if ((server->ops->posix_mkdir) && (tcon->posix_extensions)) {
1609 rc = server->ops->posix_mkdir(xid, inode, mode, tcon, full_path,
1610 cifs_sb);
1611 d_drop(direntry); /* for time being always refresh inode info */
1612 goto mkdir_out;
1613 }
1614
1615 if (cap_unix(tcon->ses) && (CIFS_UNIX_POSIX_PATH_OPS_CAP &
1616 le64_to_cpu(tcon->fsUnixInfo.Capability))) {
1617 rc = cifs_posix_mkdir(inode, direntry, mode, full_path, cifs_sb,
1618 tcon, xid);
1619 if (rc != -EOPNOTSUPP)
1620 goto mkdir_out;
1621 }
1622
1623 if (!server->ops->mkdir) {
1624 rc = -ENOSYS;
1625 goto mkdir_out;
1626 }
1627
1628 /* BB add setting the equivalent of mode via CreateX w/ACLs */
1629 rc = server->ops->mkdir(xid, inode, mode, tcon, full_path, cifs_sb);
1630 if (rc) {
1631 cifs_dbg(FYI, "cifs_mkdir returned 0x%x\n", rc);
1632 d_drop(direntry);
1633 goto mkdir_out;
1634 }
1635
1636 /* TODO: skip this for smb2/smb3 */
1637 rc = cifs_mkdir_qinfo(inode, direntry, mode, full_path, cifs_sb, tcon,
1638 xid);
1639 mkdir_out:
1640 /*
1641 * Force revalidate to get parent dir info when needed since cached
1642 * attributes are invalid now.
1643 */
1644 CIFS_I(inode)->time = 0;
1645 kfree(full_path);
1646 free_xid(xid);
1647 cifs_put_tlink(tlink);
1648 return rc;
1649 }
1650
1651 int cifs_rmdir(struct inode *inode, struct dentry *direntry)
1652 {
1653 int rc = 0;
1654 unsigned int xid;
1655 struct cifs_sb_info *cifs_sb;
1656 struct tcon_link *tlink;
1657 struct cifs_tcon *tcon;
1658 struct TCP_Server_Info *server;
1659 char *full_path = NULL;
1660 struct cifsInodeInfo *cifsInode;
1661
1662 cifs_dbg(FYI, "cifs_rmdir, inode = 0x%p\n", inode);
1663
1664 xid = get_xid();
1665
1666 full_path = build_path_from_dentry(direntry);
1667 if (full_path == NULL) {
1668 rc = -ENOMEM;
1669 goto rmdir_exit;
1670 }
1671
1672 cifs_sb = CIFS_SB(inode->i_sb);
1673 tlink = cifs_sb_tlink(cifs_sb);
1674 if (IS_ERR(tlink)) {
1675 rc = PTR_ERR(tlink);
1676 goto rmdir_exit;
1677 }
1678 tcon = tlink_tcon(tlink);
1679 server = tcon->ses->server;
1680
1681 if (!server->ops->rmdir) {
1682 rc = -ENOSYS;
1683 cifs_put_tlink(tlink);
1684 goto rmdir_exit;
1685 }
1686
1687 rc = server->ops->rmdir(xid, tcon, full_path, cifs_sb);
1688 cifs_put_tlink(tlink);
1689
1690 if (!rc) {
1691 spin_lock(&d_inode(direntry)->i_lock);
1692 i_size_write(d_inode(direntry), 0);
1693 clear_nlink(d_inode(direntry));
1694 spin_unlock(&d_inode(direntry)->i_lock);
1695 }
1696
1697 cifsInode = CIFS_I(d_inode(direntry));
1698 /* force revalidate to go get info when needed */
1699 cifsInode->time = 0;
1700
1701 cifsInode = CIFS_I(inode);
1702 /*
1703 * Force revalidate to get parent dir info when needed since cached
1704 * attributes are invalid now.
1705 */
1706 cifsInode->time = 0;
1707
1708 d_inode(direntry)->i_ctime = inode->i_ctime = inode->i_mtime =
1709 current_time(inode);
1710
1711 rmdir_exit:
1712 kfree(full_path);
1713 free_xid(xid);
1714 return rc;
1715 }
1716
1717 static int
1718 cifs_do_rename(const unsigned int xid, struct dentry *from_dentry,
1719 const char *from_path, struct dentry *to_dentry,
1720 const char *to_path)
1721 {
1722 struct cifs_sb_info *cifs_sb = CIFS_SB(from_dentry->d_sb);
1723 struct tcon_link *tlink;
1724 struct cifs_tcon *tcon;
1725 struct TCP_Server_Info *server;
1726 struct cifs_fid fid;
1727 struct cifs_open_parms oparms;
1728 int oplock, rc;
1729
1730 tlink = cifs_sb_tlink(cifs_sb);
1731 if (IS_ERR(tlink))
1732 return PTR_ERR(tlink);
1733 tcon = tlink_tcon(tlink);
1734 server = tcon->ses->server;
1735
1736 if (!server->ops->rename)
1737 return -ENOSYS;
1738
1739 /* try path-based rename first */
1740 rc = server->ops->rename(xid, tcon, from_path, to_path, cifs_sb);
1741
1742 /*
1743 * Don't bother with rename by filehandle unless file is busy and
1744 * source. Note that cross directory moves do not work with
1745 * rename by filehandle to various Windows servers.
1746 */
1747 if (rc == 0 || rc != -EBUSY)
1748 goto do_rename_exit;
1749
1750 /* Don't fall back to using SMB on SMB 2+ mount */
1751 if (server->vals->protocol_id != 0)
1752 goto do_rename_exit;
1753
1754 /* open-file renames don't work across directories */
1755 if (to_dentry->d_parent != from_dentry->d_parent)
1756 goto do_rename_exit;
1757
1758 oparms.tcon = tcon;
1759 oparms.cifs_sb = cifs_sb;
1760 /* open the file to be renamed -- we need DELETE perms */
1761 oparms.desired_access = DELETE;
1762 oparms.create_options = CREATE_NOT_DIR;
1763 oparms.disposition = FILE_OPEN;
1764 oparms.path = from_path;
1765 oparms.fid = &fid;
1766 oparms.reconnect = false;
1767
1768 rc = CIFS_open(xid, &oparms, &oplock, NULL);
1769 if (rc == 0) {
1770 rc = CIFSSMBRenameOpenFile(xid, tcon, fid.netfid,
1771 (const char *) to_dentry->d_name.name,
1772 cifs_sb->local_nls, cifs_remap(cifs_sb));
1773 CIFSSMBClose(xid, tcon, fid.netfid);
1774 }
1775 do_rename_exit:
1776 cifs_put_tlink(tlink);
1777 return rc;
1778 }
1779
1780 int
1781 cifs_rename2(struct inode *source_dir, struct dentry *source_dentry,
1782 struct inode *target_dir, struct dentry *target_dentry,
1783 unsigned int flags)
1784 {
1785 char *from_name = NULL;
1786 char *to_name = NULL;
1787 struct cifs_sb_info *cifs_sb;
1788 struct tcon_link *tlink;
1789 struct cifs_tcon *tcon;
1790 FILE_UNIX_BASIC_INFO *info_buf_source = NULL;
1791 FILE_UNIX_BASIC_INFO *info_buf_target;
1792 unsigned int xid;
1793 int rc, tmprc;
1794
1795 if (flags & ~RENAME_NOREPLACE)
1796 return -EINVAL;
1797
1798 cifs_sb = CIFS_SB(source_dir->i_sb);
1799 tlink = cifs_sb_tlink(cifs_sb);
1800 if (IS_ERR(tlink))
1801 return PTR_ERR(tlink);
1802 tcon = tlink_tcon(tlink);
1803
1804 xid = get_xid();
1805
1806 /*
1807 * we already have the rename sem so we do not need to
1808 * grab it again here to protect the path integrity
1809 */
1810 from_name = build_path_from_dentry(source_dentry);
1811 if (from_name == NULL) {
1812 rc = -ENOMEM;
1813 goto cifs_rename_exit;
1814 }
1815
1816 to_name = build_path_from_dentry(target_dentry);
1817 if (to_name == NULL) {
1818 rc = -ENOMEM;
1819 goto cifs_rename_exit;
1820 }
1821
1822 rc = cifs_do_rename(xid, source_dentry, from_name, target_dentry,
1823 to_name);
1824
1825 /*
1826 * No-replace is the natural behavior for CIFS, so skip unlink hacks.
1827 */
1828 if (flags & RENAME_NOREPLACE)
1829 goto cifs_rename_exit;
1830
1831 if (rc == -EEXIST && tcon->unix_ext) {
1832 /*
1833 * Are src and dst hardlinks of same inode? We can only tell
1834 * with unix extensions enabled.
1835 */
1836 info_buf_source =
1837 kmalloc_array(2, sizeof(FILE_UNIX_BASIC_INFO),
1838 GFP_KERNEL);
1839 if (info_buf_source == NULL) {
1840 rc = -ENOMEM;
1841 goto cifs_rename_exit;
1842 }
1843
1844 info_buf_target = info_buf_source + 1;
1845 tmprc = CIFSSMBUnixQPathInfo(xid, tcon, from_name,
1846 info_buf_source,
1847 cifs_sb->local_nls,
1848 cifs_remap(cifs_sb));
1849 if (tmprc != 0)
1850 goto unlink_target;
1851
1852 tmprc = CIFSSMBUnixQPathInfo(xid, tcon, to_name,
1853 info_buf_target,
1854 cifs_sb->local_nls,
1855 cifs_remap(cifs_sb));
1856
1857 if (tmprc == 0 && (info_buf_source->UniqueId ==
1858 info_buf_target->UniqueId)) {
1859 /* same file, POSIX says that this is a noop */
1860 rc = 0;
1861 goto cifs_rename_exit;
1862 }
1863 }
1864 /*
1865 * else ... BB we could add the same check for Windows by
1866 * checking the UniqueId via FILE_INTERNAL_INFO
1867 */
1868
1869 unlink_target:
1870 /* Try unlinking the target dentry if it's not negative */
1871 if (d_really_is_positive(target_dentry) && (rc == -EACCES || rc == -EEXIST)) {
1872 if (d_is_dir(target_dentry))
1873 tmprc = cifs_rmdir(target_dir, target_dentry);
1874 else
1875 tmprc = cifs_unlink(target_dir, target_dentry);
1876 if (tmprc)
1877 goto cifs_rename_exit;
1878 rc = cifs_do_rename(xid, source_dentry, from_name,
1879 target_dentry, to_name);
1880 }
1881
1882 /* force revalidate to go get info when needed */
1883 CIFS_I(source_dir)->time = CIFS_I(target_dir)->time = 0;
1884
1885 source_dir->i_ctime = source_dir->i_mtime = target_dir->i_ctime =
1886 target_dir->i_mtime = current_time(source_dir);
1887
1888 cifs_rename_exit:
1889 kfree(info_buf_source);
1890 kfree(from_name);
1891 kfree(to_name);
1892 free_xid(xid);
1893 cifs_put_tlink(tlink);
1894 return rc;
1895 }
1896
1897 static bool
1898 cifs_inode_needs_reval(struct inode *inode)
1899 {
1900 struct cifsInodeInfo *cifs_i = CIFS_I(inode);
1901 struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
1902
1903 if (cifs_i->time == 0)
1904 return true;
1905
1906 if (CIFS_CACHE_READ(cifs_i))
1907 return false;
1908
1909 if (!lookupCacheEnabled)
1910 return true;
1911
1912 if (!cifs_sb->actimeo)
1913 return true;
1914
1915 if (!time_in_range(jiffies, cifs_i->time,
1916 cifs_i->time + cifs_sb->actimeo))
1917 return true;
1918
1919 /* hardlinked files w/ noserverino get "special" treatment */
1920 if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM) &&
1921 S_ISREG(inode->i_mode) && inode->i_nlink != 1)
1922 return true;
1923
1924 return false;
1925 }
1926
1927 /*
1928 * Zap the cache. Called when invalid_mapping flag is set.
1929 */
1930 int
1931 cifs_invalidate_mapping(struct inode *inode)
1932 {
1933 int rc = 0;
1934
1935 if (inode->i_mapping && inode->i_mapping->nrpages != 0) {
1936 rc = invalidate_inode_pages2(inode->i_mapping);
1937 if (rc)
1938 cifs_dbg(VFS, "%s: could not invalidate inode %p\n",
1939 __func__, inode);
1940 }
1941
1942 cifs_fscache_reset_inode_cookie(inode);
1943 return rc;
1944 }
1945
1946 /**
1947 * cifs_wait_bit_killable - helper for functions that are sleeping on bit locks
1948 * @word: long word containing the bit lock
1949 */
1950 static int
1951 cifs_wait_bit_killable(struct wait_bit_key *key, int mode)
1952 {
1953 freezable_schedule_unsafe();
1954 if (signal_pending_state(mode, current))
1955 return -ERESTARTSYS;
1956 return 0;
1957 }
1958
1959 int
1960 cifs_revalidate_mapping(struct inode *inode)
1961 {
1962 int rc;
1963 unsigned long *flags = &CIFS_I(inode)->flags;
1964
1965 rc = wait_on_bit_lock_action(flags, CIFS_INO_LOCK, cifs_wait_bit_killable,
1966 TASK_KILLABLE);
1967 if (rc)
1968 return rc;
1969
1970 if (test_and_clear_bit(CIFS_INO_INVALID_MAPPING, flags)) {
1971 rc = cifs_invalidate_mapping(inode);
1972 if (rc)
1973 set_bit(CIFS_INO_INVALID_MAPPING, flags);
1974 }
1975
1976 clear_bit_unlock(CIFS_INO_LOCK, flags);
1977 smp_mb__after_atomic();
1978 wake_up_bit(flags, CIFS_INO_LOCK);
1979
1980 return rc;
1981 }
1982
1983 int
1984 cifs_zap_mapping(struct inode *inode)
1985 {
1986 set_bit(CIFS_INO_INVALID_MAPPING, &CIFS_I(inode)->flags);
1987 return cifs_revalidate_mapping(inode);
1988 }
1989
1990 int cifs_revalidate_file_attr(struct file *filp)
1991 {
1992 int rc = 0;
1993 struct inode *inode = file_inode(filp);
1994 struct cifsFileInfo *cfile = (struct cifsFileInfo *) filp->private_data;
1995
1996 if (!cifs_inode_needs_reval(inode))
1997 return rc;
1998
1999 if (tlink_tcon(cfile->tlink)->unix_ext)
2000 rc = cifs_get_file_info_unix(filp);
2001 else
2002 rc = cifs_get_file_info(filp);
2003
2004 return rc;
2005 }
2006
2007 int cifs_revalidate_dentry_attr(struct dentry *dentry)
2008 {
2009 unsigned int xid;
2010 int rc = 0;
2011 struct inode *inode = d_inode(dentry);
2012 struct super_block *sb = dentry->d_sb;
2013 char *full_path = NULL;
2014
2015 if (inode == NULL)
2016 return -ENOENT;
2017
2018 if (!cifs_inode_needs_reval(inode))
2019 return rc;
2020
2021 xid = get_xid();
2022
2023 /* can not safely grab the rename sem here if rename calls revalidate
2024 since that would deadlock */
2025 full_path = build_path_from_dentry(dentry);
2026 if (full_path == NULL) {
2027 rc = -ENOMEM;
2028 goto out;
2029 }
2030
2031 cifs_dbg(FYI, "Update attributes: %s inode 0x%p count %d dentry: 0x%p d_time %ld jiffies %ld\n",
2032 full_path, inode, inode->i_count.counter,
2033 dentry, cifs_get_time(dentry), jiffies);
2034
2035 if (cifs_sb_master_tcon(CIFS_SB(sb))->unix_ext)
2036 rc = cifs_get_inode_info_unix(&inode, full_path, sb, xid);
2037 else
2038 rc = cifs_get_inode_info(&inode, full_path, NULL, sb,
2039 xid, NULL);
2040
2041 out:
2042 kfree(full_path);
2043 free_xid(xid);
2044 return rc;
2045 }
2046
2047 int cifs_revalidate_file(struct file *filp)
2048 {
2049 int rc;
2050 struct inode *inode = file_inode(filp);
2051
2052 rc = cifs_revalidate_file_attr(filp);
2053 if (rc)
2054 return rc;
2055
2056 return cifs_revalidate_mapping(inode);
2057 }
2058
2059 /* revalidate a dentry's inode attributes */
2060 int cifs_revalidate_dentry(struct dentry *dentry)
2061 {
2062 int rc;
2063 struct inode *inode = d_inode(dentry);
2064
2065 rc = cifs_revalidate_dentry_attr(dentry);
2066 if (rc)
2067 return rc;
2068
2069 return cifs_revalidate_mapping(inode);
2070 }
2071
2072 int cifs_getattr(const struct path *path, struct kstat *stat,
2073 u32 request_mask, unsigned int flags)
2074 {
2075 struct dentry *dentry = path->dentry;
2076 struct cifs_sb_info *cifs_sb = CIFS_SB(dentry->d_sb);
2077 struct cifs_tcon *tcon = cifs_sb_master_tcon(cifs_sb);
2078 struct inode *inode = d_inode(dentry);
2079 int rc;
2080
2081 /*
2082 * We need to be sure that all dirty pages are written and the server
2083 * has actual ctime, mtime and file length.
2084 */
2085 if (!CIFS_CACHE_READ(CIFS_I(inode)) && inode->i_mapping &&
2086 inode->i_mapping->nrpages != 0) {
2087 rc = filemap_fdatawait(inode->i_mapping);
2088 if (rc) {
2089 mapping_set_error(inode->i_mapping, rc);
2090 return rc;
2091 }
2092 }
2093
2094 rc = cifs_revalidate_dentry_attr(dentry);
2095 if (rc)
2096 return rc;
2097
2098 generic_fillattr(inode, stat);
2099 stat->blksize = cifs_sb->bsize;
2100 stat->ino = CIFS_I(inode)->uniqueid;
2101
2102 /* old CIFS Unix Extensions doesn't return create time */
2103 if (CIFS_I(inode)->createtime) {
2104 stat->result_mask |= STATX_BTIME;
2105 stat->btime =
2106 cifs_NTtimeToUnix(cpu_to_le64(CIFS_I(inode)->createtime));
2107 }
2108
2109 stat->attributes_mask |= (STATX_ATTR_COMPRESSED | STATX_ATTR_ENCRYPTED);
2110 if (CIFS_I(inode)->cifsAttrs & FILE_ATTRIBUTE_COMPRESSED)
2111 stat->attributes |= STATX_ATTR_COMPRESSED;
2112 if (CIFS_I(inode)->cifsAttrs & FILE_ATTRIBUTE_ENCRYPTED)
2113 stat->attributes |= STATX_ATTR_ENCRYPTED;
2114
2115 /*
2116 * If on a multiuser mount without unix extensions or cifsacl being
2117 * enabled, and the admin hasn't overridden them, set the ownership
2118 * to the fsuid/fsgid of the current process.
2119 */
2120 if ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MULTIUSER) &&
2121 !(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_CIFS_ACL) &&
2122 !tcon->unix_ext) {
2123 if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_OVERR_UID))
2124 stat->uid = current_fsuid();
2125 if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_OVERR_GID))
2126 stat->gid = current_fsgid();
2127 }
2128 return rc;
2129 }
2130
2131 int cifs_fiemap(struct inode *inode, struct fiemap_extent_info *fei, u64 start,
2132 u64 len)
2133 {
2134 struct cifsInodeInfo *cifs_i = CIFS_I(inode);
2135 struct cifs_sb_info *cifs_sb = CIFS_SB(cifs_i->vfs_inode.i_sb);
2136 struct cifs_tcon *tcon = cifs_sb_master_tcon(cifs_sb);
2137 struct TCP_Server_Info *server = tcon->ses->server;
2138 struct cifsFileInfo *cfile;
2139 int rc;
2140
2141 /*
2142 * We need to be sure that all dirty pages are written as they
2143 * might fill holes on the server.
2144 */
2145 if (!CIFS_CACHE_READ(CIFS_I(inode)) && inode->i_mapping &&
2146 inode->i_mapping->nrpages != 0) {
2147 rc = filemap_fdatawait(inode->i_mapping);
2148 if (rc) {
2149 mapping_set_error(inode->i_mapping, rc);
2150 return rc;
2151 }
2152 }
2153
2154 cfile = find_readable_file(cifs_i, false);
2155 if (cfile == NULL)
2156 return -EINVAL;
2157
2158 if (server->ops->fiemap) {
2159 rc = server->ops->fiemap(tcon, cfile, fei, start, len);
2160 cifsFileInfo_put(cfile);
2161 return rc;
2162 }
2163
2164 cifsFileInfo_put(cfile);
2165 return -ENOTSUPP;
2166 }
2167
2168 static int cifs_truncate_page(struct address_space *mapping, loff_t from)
2169 {
2170 pgoff_t index = from >> PAGE_SHIFT;
2171 unsigned offset = from & (PAGE_SIZE - 1);
2172 struct page *page;
2173 int rc = 0;
2174
2175 page = grab_cache_page(mapping, index);
2176 if (!page)
2177 return -ENOMEM;
2178
2179 zero_user_segment(page, offset, PAGE_SIZE);
2180 unlock_page(page);
2181 put_page(page);
2182 return rc;
2183 }
2184
2185 static void cifs_setsize(struct inode *inode, loff_t offset)
2186 {
2187 struct cifsInodeInfo *cifs_i = CIFS_I(inode);
2188
2189 spin_lock(&inode->i_lock);
2190 i_size_write(inode, offset);
2191 spin_unlock(&inode->i_lock);
2192
2193 /* Cached inode must be refreshed on truncate */
2194 cifs_i->time = 0;
2195 truncate_pagecache(inode, offset);
2196 }
2197
2198 static int
2199 cifs_set_file_size(struct inode *inode, struct iattr *attrs,
2200 unsigned int xid, char *full_path)
2201 {
2202 int rc;
2203 struct cifsFileInfo *open_file;
2204 struct cifsInodeInfo *cifsInode = CIFS_I(inode);
2205 struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
2206 struct tcon_link *tlink = NULL;
2207 struct cifs_tcon *tcon = NULL;
2208 struct TCP_Server_Info *server;
2209
2210 /*
2211 * To avoid spurious oplock breaks from server, in the case of
2212 * inodes that we already have open, avoid doing path based
2213 * setting of file size if we can do it by handle.
2214 * This keeps our caching token (oplock) and avoids timeouts
2215 * when the local oplock break takes longer to flush
2216 * writebehind data than the SMB timeout for the SetPathInfo
2217 * request would allow
2218 */
2219 open_file = find_writable_file(cifsInode, true);
2220 if (open_file) {
2221 tcon = tlink_tcon(open_file->tlink);
2222 server = tcon->ses->server;
2223 if (server->ops->set_file_size)
2224 rc = server->ops->set_file_size(xid, tcon, open_file,
2225 attrs->ia_size, false);
2226 else
2227 rc = -ENOSYS;
2228 cifsFileInfo_put(open_file);
2229 cifs_dbg(FYI, "SetFSize for attrs rc = %d\n", rc);
2230 } else
2231 rc = -EINVAL;
2232
2233 if (!rc)
2234 goto set_size_out;
2235
2236 if (tcon == NULL) {
2237 tlink = cifs_sb_tlink(cifs_sb);
2238 if (IS_ERR(tlink))
2239 return PTR_ERR(tlink);
2240 tcon = tlink_tcon(tlink);
2241 server = tcon->ses->server;
2242 }
2243
2244 /*
2245 * Set file size by pathname rather than by handle either because no
2246 * valid, writeable file handle for it was found or because there was
2247 * an error setting it by handle.
2248 */
2249 if (server->ops->set_path_size)
2250 rc = server->ops->set_path_size(xid, tcon, full_path,
2251 attrs->ia_size, cifs_sb, false);
2252 else
2253 rc = -ENOSYS;
2254 cifs_dbg(FYI, "SetEOF by path (setattrs) rc = %d\n", rc);
2255
2256 if (tlink)
2257 cifs_put_tlink(tlink);
2258
2259 set_size_out:
2260 if (rc == 0) {
2261 cifsInode->server_eof = attrs->ia_size;
2262 cifs_setsize(inode, attrs->ia_size);
2263 cifs_truncate_page(inode->i_mapping, inode->i_size);
2264 }
2265
2266 return rc;
2267 }
2268
2269 static int
2270 cifs_setattr_unix(struct dentry *direntry, struct iattr *attrs)
2271 {
2272 int rc;
2273 unsigned int xid;
2274 char *full_path = NULL;
2275 struct inode *inode = d_inode(direntry);
2276 struct cifsInodeInfo *cifsInode = CIFS_I(inode);
2277 struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
2278 struct tcon_link *tlink;
2279 struct cifs_tcon *pTcon;
2280 struct cifs_unix_set_info_args *args = NULL;
2281 struct cifsFileInfo *open_file;
2282
2283 cifs_dbg(FYI, "setattr_unix on file %pd attrs->ia_valid=0x%x\n",
2284 direntry, attrs->ia_valid);
2285
2286 xid = get_xid();
2287
2288 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_PERM)
2289 attrs->ia_valid |= ATTR_FORCE;
2290
2291 rc = setattr_prepare(direntry, attrs);
2292 if (rc < 0)
2293 goto out;
2294
2295 full_path = build_path_from_dentry(direntry);
2296 if (full_path == NULL) {
2297 rc = -ENOMEM;
2298 goto out;
2299 }
2300
2301 /*
2302 * Attempt to flush data before changing attributes. We need to do
2303 * this for ATTR_SIZE and ATTR_MTIME for sure, and if we change the
2304 * ownership or mode then we may also need to do this. Here, we take
2305 * the safe way out and just do the flush on all setattr requests. If
2306 * the flush returns error, store it to report later and continue.
2307 *
2308 * BB: This should be smarter. Why bother flushing pages that
2309 * will be truncated anyway? Also, should we error out here if
2310 * the flush returns error?
2311 */
2312 rc = filemap_write_and_wait(inode->i_mapping);
2313 if (is_interrupt_error(rc)) {
2314 rc = -ERESTARTSYS;
2315 goto out;
2316 }
2317
2318 mapping_set_error(inode->i_mapping, rc);
2319 rc = 0;
2320
2321 if (attrs->ia_valid & ATTR_SIZE) {
2322 rc = cifs_set_file_size(inode, attrs, xid, full_path);
2323 if (rc != 0)
2324 goto out;
2325 }
2326
2327 /* skip mode change if it's just for clearing setuid/setgid */
2328 if (attrs->ia_valid & (ATTR_KILL_SUID|ATTR_KILL_SGID))
2329 attrs->ia_valid &= ~ATTR_MODE;
2330
2331 args = kmalloc(sizeof(*args), GFP_KERNEL);
2332 if (args == NULL) {
2333 rc = -ENOMEM;
2334 goto out;
2335 }
2336
2337 /* set up the struct */
2338 if (attrs->ia_valid & ATTR_MODE)
2339 args->mode = attrs->ia_mode;
2340 else
2341 args->mode = NO_CHANGE_64;
2342
2343 if (attrs->ia_valid & ATTR_UID)
2344 args->uid = attrs->ia_uid;
2345 else
2346 args->uid = INVALID_UID; /* no change */
2347
2348 if (attrs->ia_valid & ATTR_GID)
2349 args->gid = attrs->ia_gid;
2350 else
2351 args->gid = INVALID_GID; /* no change */
2352
2353 if (attrs->ia_valid & ATTR_ATIME)
2354 args->atime = cifs_UnixTimeToNT(attrs->ia_atime);
2355 else
2356 args->atime = NO_CHANGE_64;
2357
2358 if (attrs->ia_valid & ATTR_MTIME)
2359 args->mtime = cifs_UnixTimeToNT(attrs->ia_mtime);
2360 else
2361 args->mtime = NO_CHANGE_64;
2362
2363 if (attrs->ia_valid & ATTR_CTIME)
2364 args->ctime = cifs_UnixTimeToNT(attrs->ia_ctime);
2365 else
2366 args->ctime = NO_CHANGE_64;
2367
2368 args->device = 0;
2369 open_file = find_writable_file(cifsInode, true);
2370 if (open_file) {
2371 u16 nfid = open_file->fid.netfid;
2372 u32 npid = open_file->pid;
2373 pTcon = tlink_tcon(open_file->tlink);
2374 rc = CIFSSMBUnixSetFileInfo(xid, pTcon, args, nfid, npid);
2375 cifsFileInfo_put(open_file);
2376 } else {
2377 tlink = cifs_sb_tlink(cifs_sb);
2378 if (IS_ERR(tlink)) {
2379 rc = PTR_ERR(tlink);
2380 goto out;
2381 }
2382 pTcon = tlink_tcon(tlink);
2383 rc = CIFSSMBUnixSetPathInfo(xid, pTcon, full_path, args,
2384 cifs_sb->local_nls,
2385 cifs_remap(cifs_sb));
2386 cifs_put_tlink(tlink);
2387 }
2388
2389 if (rc)
2390 goto out;
2391
2392 if ((attrs->ia_valid & ATTR_SIZE) &&
2393 attrs->ia_size != i_size_read(inode))
2394 truncate_setsize(inode, attrs->ia_size);
2395
2396 setattr_copy(inode, attrs);
2397 mark_inode_dirty(inode);
2398
2399 /* force revalidate when any of these times are set since some
2400 of the fs types (eg ext3, fat) do not have fine enough
2401 time granularity to match protocol, and we do not have a
2402 a way (yet) to query the server fs's time granularity (and
2403 whether it rounds times down).
2404 */
2405 if (attrs->ia_valid & (ATTR_MTIME | ATTR_CTIME))
2406 cifsInode->time = 0;
2407 out:
2408 kfree(args);
2409 kfree(full_path);
2410 free_xid(xid);
2411 return rc;
2412 }
2413
2414 static int
2415 cifs_setattr_nounix(struct dentry *direntry, struct iattr *attrs)
2416 {
2417 unsigned int xid;
2418 kuid_t uid = INVALID_UID;
2419 kgid_t gid = INVALID_GID;
2420 struct inode *inode = d_inode(direntry);
2421 struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
2422 struct cifsInodeInfo *cifsInode = CIFS_I(inode);
2423 struct cifsFileInfo *wfile;
2424 struct cifs_tcon *tcon;
2425 char *full_path = NULL;
2426 int rc = -EACCES;
2427 __u32 dosattr = 0;
2428 __u64 mode = NO_CHANGE_64;
2429
2430 xid = get_xid();
2431
2432 cifs_dbg(FYI, "setattr on file %pd attrs->ia_valid 0x%x\n",
2433 direntry, attrs->ia_valid);
2434
2435 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_PERM)
2436 attrs->ia_valid |= ATTR_FORCE;
2437
2438 rc = setattr_prepare(direntry, attrs);
2439 if (rc < 0) {
2440 free_xid(xid);
2441 return rc;
2442 }
2443
2444 full_path = build_path_from_dentry(direntry);
2445 if (full_path == NULL) {
2446 rc = -ENOMEM;
2447 free_xid(xid);
2448 return rc;
2449 }
2450
2451 /*
2452 * Attempt to flush data before changing attributes. We need to do
2453 * this for ATTR_SIZE and ATTR_MTIME for sure, and if we change the
2454 * ownership or mode then we may also need to do this. Here, we take
2455 * the safe way out and just do the flush on all setattr requests. If
2456 * the flush returns error, store it to report later and continue.
2457 *
2458 * BB: This should be smarter. Why bother flushing pages that
2459 * will be truncated anyway? Also, should we error out here if
2460 * the flush returns error?
2461 */
2462 rc = filemap_write_and_wait(inode->i_mapping);
2463 if (is_interrupt_error(rc)) {
2464 rc = -ERESTARTSYS;
2465 goto cifs_setattr_exit;
2466 }
2467
2468 mapping_set_error(inode->i_mapping, rc);
2469 rc = 0;
2470
2471 if (attrs->ia_valid & ATTR_MTIME) {
2472 rc = cifs_get_writable_file(cifsInode, false, &wfile);
2473 if (!rc) {
2474 tcon = tlink_tcon(wfile->tlink);
2475 rc = tcon->ses->server->ops->flush(xid, tcon, &wfile->fid);
2476 cifsFileInfo_put(wfile);
2477 if (rc)
2478 goto cifs_setattr_exit;
2479 } else if (rc != -EBADF)
2480 goto cifs_setattr_exit;
2481 else
2482 rc = 0;
2483 }
2484
2485 if (attrs->ia_valid & ATTR_SIZE) {
2486 rc = cifs_set_file_size(inode, attrs, xid, full_path);
2487 if (rc != 0)
2488 goto cifs_setattr_exit;
2489 }
2490
2491 if (attrs->ia_valid & ATTR_UID)
2492 uid = attrs->ia_uid;
2493
2494 if (attrs->ia_valid & ATTR_GID)
2495 gid = attrs->ia_gid;
2496
2497 if ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_CIFS_ACL) ||
2498 (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MODE_FROM_SID)) {
2499 if (uid_valid(uid) || gid_valid(gid)) {
2500 rc = id_mode_to_cifs_acl(inode, full_path, NO_CHANGE_64,
2501 uid, gid);
2502 if (rc) {
2503 cifs_dbg(FYI, "%s: Setting id failed with error: %d\n",
2504 __func__, rc);
2505 goto cifs_setattr_exit;
2506 }
2507 }
2508 } else
2509 if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SET_UID))
2510 attrs->ia_valid &= ~(ATTR_UID | ATTR_GID);
2511
2512 /* skip mode change if it's just for clearing setuid/setgid */
2513 if (attrs->ia_valid & (ATTR_KILL_SUID|ATTR_KILL_SGID))
2514 attrs->ia_valid &= ~ATTR_MODE;
2515
2516 if (attrs->ia_valid & ATTR_MODE) {
2517 mode = attrs->ia_mode;
2518 rc = 0;
2519 if ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_CIFS_ACL) ||
2520 (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MODE_FROM_SID)) {
2521 rc = id_mode_to_cifs_acl(inode, full_path, mode,
2522 INVALID_UID, INVALID_GID);
2523 if (rc) {
2524 cifs_dbg(FYI, "%s: Setting ACL failed with error: %d\n",
2525 __func__, rc);
2526 goto cifs_setattr_exit;
2527 }
2528 } else
2529 if (((mode & S_IWUGO) == 0) &&
2530 (cifsInode->cifsAttrs & ATTR_READONLY) == 0) {
2531
2532 dosattr = cifsInode->cifsAttrs | ATTR_READONLY;
2533
2534 /* fix up mode if we're not using dynperm */
2535 if ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DYNPERM) == 0)
2536 attrs->ia_mode = inode->i_mode & ~S_IWUGO;
2537 } else if ((mode & S_IWUGO) &&
2538 (cifsInode->cifsAttrs & ATTR_READONLY)) {
2539
2540 dosattr = cifsInode->cifsAttrs & ~ATTR_READONLY;
2541 /* Attributes of 0 are ignored */
2542 if (dosattr == 0)
2543 dosattr |= ATTR_NORMAL;
2544
2545 /* reset local inode permissions to normal */
2546 if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DYNPERM)) {
2547 attrs->ia_mode &= ~(S_IALLUGO);
2548 if (S_ISDIR(inode->i_mode))
2549 attrs->ia_mode |=
2550 cifs_sb->mnt_dir_mode;
2551 else
2552 attrs->ia_mode |=
2553 cifs_sb->mnt_file_mode;
2554 }
2555 } else if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DYNPERM)) {
2556 /* ignore mode change - ATTR_READONLY hasn't changed */
2557 attrs->ia_valid &= ~ATTR_MODE;
2558 }
2559 }
2560
2561 if (attrs->ia_valid & (ATTR_MTIME|ATTR_ATIME|ATTR_CTIME) ||
2562 ((attrs->ia_valid & ATTR_MODE) && dosattr)) {
2563 rc = cifs_set_file_info(inode, attrs, xid, full_path, dosattr);
2564 /* BB: check for rc = -EOPNOTSUPP and switch to legacy mode */
2565
2566 /* Even if error on time set, no sense failing the call if
2567 the server would set the time to a reasonable value anyway,
2568 and this check ensures that we are not being called from
2569 sys_utimes in which case we ought to fail the call back to
2570 the user when the server rejects the call */
2571 if ((rc) && (attrs->ia_valid &
2572 (ATTR_MODE | ATTR_GID | ATTR_UID | ATTR_SIZE)))
2573 rc = 0;
2574 }
2575
2576 /* do not need local check to inode_check_ok since the server does
2577 that */
2578 if (rc)
2579 goto cifs_setattr_exit;
2580
2581 if ((attrs->ia_valid & ATTR_SIZE) &&
2582 attrs->ia_size != i_size_read(inode))
2583 truncate_setsize(inode, attrs->ia_size);
2584
2585 setattr_copy(inode, attrs);
2586 mark_inode_dirty(inode);
2587
2588 cifs_setattr_exit:
2589 kfree(full_path);
2590 free_xid(xid);
2591 return rc;
2592 }
2593
2594 int
2595 cifs_setattr(struct dentry *direntry, struct iattr *attrs)
2596 {
2597 struct cifs_sb_info *cifs_sb = CIFS_SB(direntry->d_sb);
2598 struct cifs_tcon *pTcon = cifs_sb_master_tcon(cifs_sb);
2599
2600 if (pTcon->unix_ext)
2601 return cifs_setattr_unix(direntry, attrs);
2602
2603 return cifs_setattr_nounix(direntry, attrs);
2604
2605 /* BB: add cifs_setattr_legacy for really old servers */
2606 }
2607
2608 #if 0
2609 void cifs_delete_inode(struct inode *inode)
2610 {
2611 cifs_dbg(FYI, "In cifs_delete_inode, inode = 0x%p\n", inode);
2612 /* may have to add back in if and when safe distributed caching of
2613 directories added e.g. via FindNotify */
2614 }
2615 #endif
2616
