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Merge tag 'writeback-lock-fix' of git://git.kernel.org/pub/scm/linux/kernel/git/wfg...
[mirror_ubuntu-bionic-kernel.git] / fs / cifs / inode.c
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 unsigned long oldtime = cifs_i->time;
128
129 cifs_revalidate_cache(inode, fattr);
130
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 cFYI(1, "inode 0x%p old_time=%ld new_time=%ld", inode,
152 oldtime, cifs_i->time);
153
154 cifs_i->delete_pending = fattr->cf_flags & CIFS_FATTR_DELETE_PENDING;
155
156 cifs_i->server_eof = fattr->cf_eof;
157 /*
158 * Can't safely change the file size here if the client is writing to
159 * it due to potential races.
160 */
161 spin_lock(&inode->i_lock);
162 if (is_size_safe_to_change(cifs_i, fattr->cf_eof)) {
163 i_size_write(inode, fattr->cf_eof);
164
165 /*
166 * i_blocks is not related to (i_size / i_blksize),
167 * but instead 512 byte (2**9) size is required for
168 * calculating num blocks.
169 */
170 inode->i_blocks = (512 - 1 + fattr->cf_bytes) >> 9;
171 }
172 spin_unlock(&inode->i_lock);
173
174 if (fattr->cf_flags & CIFS_FATTR_DFS_REFERRAL)
175 inode->i_flags |= S_AUTOMOUNT;
176 cifs_set_ops(inode);
177 }
178
179 void
180 cifs_fill_uniqueid(struct super_block *sb, struct cifs_fattr *fattr)
181 {
182 struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
183
184 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM)
185 return;
186
187 fattr->cf_uniqueid = iunique(sb, ROOT_I);
188 }
189
190 /* Fill a cifs_fattr struct with info from FILE_UNIX_BASIC_INFO. */
191 void
192 cifs_unix_basic_to_fattr(struct cifs_fattr *fattr, FILE_UNIX_BASIC_INFO *info,
193 struct cifs_sb_info *cifs_sb)
194 {
195 memset(fattr, 0, sizeof(*fattr));
196 fattr->cf_uniqueid = le64_to_cpu(info->UniqueId);
197 fattr->cf_bytes = le64_to_cpu(info->NumOfBytes);
198 fattr->cf_eof = le64_to_cpu(info->EndOfFile);
199
200 fattr->cf_atime = cifs_NTtimeToUnix(info->LastAccessTime);
201 fattr->cf_mtime = cifs_NTtimeToUnix(info->LastModificationTime);
202 fattr->cf_ctime = cifs_NTtimeToUnix(info->LastStatusChange);
203 fattr->cf_mode = le64_to_cpu(info->Permissions);
204
205 /*
206 * Since we set the inode type below we need to mask off
207 * to avoid strange results if bits set above.
208 */
209 fattr->cf_mode &= ~S_IFMT;
210 switch (le32_to_cpu(info->Type)) {
211 case UNIX_FILE:
212 fattr->cf_mode |= S_IFREG;
213 fattr->cf_dtype = DT_REG;
214 break;
215 case UNIX_SYMLINK:
216 fattr->cf_mode |= S_IFLNK;
217 fattr->cf_dtype = DT_LNK;
218 break;
219 case UNIX_DIR:
220 fattr->cf_mode |= S_IFDIR;
221 fattr->cf_dtype = DT_DIR;
222 break;
223 case UNIX_CHARDEV:
224 fattr->cf_mode |= S_IFCHR;
225 fattr->cf_dtype = DT_CHR;
226 fattr->cf_rdev = MKDEV(le64_to_cpu(info->DevMajor),
227 le64_to_cpu(info->DevMinor) & MINORMASK);
228 break;
229 case UNIX_BLOCKDEV:
230 fattr->cf_mode |= S_IFBLK;
231 fattr->cf_dtype = DT_BLK;
232 fattr->cf_rdev = MKDEV(le64_to_cpu(info->DevMajor),
233 le64_to_cpu(info->DevMinor) & MINORMASK);
234 break;
235 case UNIX_FIFO:
236 fattr->cf_mode |= S_IFIFO;
237 fattr->cf_dtype = DT_FIFO;
238 break;
239 case UNIX_SOCKET:
240 fattr->cf_mode |= S_IFSOCK;
241 fattr->cf_dtype = DT_SOCK;
242 break;
243 default:
244 /* safest to call it a file if we do not know */
245 fattr->cf_mode |= S_IFREG;
246 fattr->cf_dtype = DT_REG;
247 cFYI(1, "unknown type %d", le32_to_cpu(info->Type));
248 break;
249 }
250
251 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_OVERR_UID)
252 fattr->cf_uid = cifs_sb->mnt_uid;
253 else
254 fattr->cf_uid = le64_to_cpu(info->Uid);
255
256 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_OVERR_GID)
257 fattr->cf_gid = cifs_sb->mnt_gid;
258 else
259 fattr->cf_gid = le64_to_cpu(info->Gid);
260
261 fattr->cf_nlink = le64_to_cpu(info->Nlinks);
262 }
263
264 /*
265 * Fill a cifs_fattr struct with fake inode info.
266 *
267 * Needed to setup cifs_fattr data for the directory which is the
268 * junction to the new submount (ie to setup the fake directory
269 * which represents a DFS referral).
270 */
271 static void
272 cifs_create_dfs_fattr(struct cifs_fattr *fattr, struct super_block *sb)
273 {
274 struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
275
276 cFYI(1, "creating fake fattr for DFS referral");
277
278 memset(fattr, 0, sizeof(*fattr));
279 fattr->cf_mode = S_IFDIR | S_IXUGO | S_IRWXU;
280 fattr->cf_uid = cifs_sb->mnt_uid;
281 fattr->cf_gid = cifs_sb->mnt_gid;
282 fattr->cf_atime = CURRENT_TIME;
283 fattr->cf_ctime = CURRENT_TIME;
284 fattr->cf_mtime = CURRENT_TIME;
285 fattr->cf_nlink = 2;
286 fattr->cf_flags |= CIFS_FATTR_DFS_REFERRAL;
287 }
288
289 int cifs_get_file_info_unix(struct file *filp)
290 {
291 int rc;
292 int xid;
293 FILE_UNIX_BASIC_INFO find_data;
294 struct cifs_fattr fattr;
295 struct inode *inode = filp->f_path.dentry->d_inode;
296 struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
297 struct cifsFileInfo *cfile = filp->private_data;
298 struct cifs_tcon *tcon = tlink_tcon(cfile->tlink);
299
300 xid = GetXid();
301 rc = CIFSSMBUnixQFileInfo(xid, tcon, cfile->netfid, &find_data);
302 if (!rc) {
303 cifs_unix_basic_to_fattr(&fattr, &find_data, cifs_sb);
304 } else if (rc == -EREMOTE) {
305 cifs_create_dfs_fattr(&fattr, inode->i_sb);
306 rc = 0;
307 }
308
309 cifs_fattr_to_inode(inode, &fattr);
310 FreeXid(xid);
311 return rc;
312 }
313
314 int cifs_get_inode_info_unix(struct inode **pinode,
315 const unsigned char *full_path,
316 struct super_block *sb, int xid)
317 {
318 int rc;
319 FILE_UNIX_BASIC_INFO find_data;
320 struct cifs_fattr fattr;
321 struct cifs_tcon *tcon;
322 struct tcon_link *tlink;
323 struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
324
325 cFYI(1, "Getting info on %s", full_path);
326
327 tlink = cifs_sb_tlink(cifs_sb);
328 if (IS_ERR(tlink))
329 return PTR_ERR(tlink);
330 tcon = tlink_tcon(tlink);
331
332 /* could have done a find first instead but this returns more info */
333 rc = CIFSSMBUnixQPathInfo(xid, tcon, full_path, &find_data,
334 cifs_sb->local_nls, cifs_sb->mnt_cifs_flags &
335 CIFS_MOUNT_MAP_SPECIAL_CHR);
336 cifs_put_tlink(tlink);
337
338 if (!rc) {
339 cifs_unix_basic_to_fattr(&fattr, &find_data, cifs_sb);
340 } else if (rc == -EREMOTE) {
341 cifs_create_dfs_fattr(&fattr, sb);
342 rc = 0;
343 } else {
344 return rc;
345 }
346
347 /* check for Minshall+French symlinks */
348 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MF_SYMLINKS) {
349 int tmprc = CIFSCheckMFSymlink(&fattr, full_path, cifs_sb, xid);
350 if (tmprc)
351 cFYI(1, "CIFSCheckMFSymlink: %d", tmprc);
352 }
353
354 if (*pinode == NULL) {
355 /* get new inode */
356 cifs_fill_uniqueid(sb, &fattr);
357 *pinode = cifs_iget(sb, &fattr);
358 if (!*pinode)
359 rc = -ENOMEM;
360 } else {
361 /* we already have inode, update it */
362 cifs_fattr_to_inode(*pinode, &fattr);
363 }
364
365 return rc;
366 }
367
368 static int
369 cifs_sfu_type(struct cifs_fattr *fattr, const unsigned char *path,
370 struct cifs_sb_info *cifs_sb, int xid)
371 {
372 int rc;
373 int oplock = 0;
374 __u16 netfid;
375 struct tcon_link *tlink;
376 struct cifs_tcon *tcon;
377 struct cifs_io_parms io_parms;
378 char buf[24];
379 unsigned int bytes_read;
380 char *pbuf;
381
382 pbuf = buf;
383
384 fattr->cf_mode &= ~S_IFMT;
385
386 if (fattr->cf_eof == 0) {
387 fattr->cf_mode |= S_IFIFO;
388 fattr->cf_dtype = DT_FIFO;
389 return 0;
390 } else if (fattr->cf_eof < 8) {
391 fattr->cf_mode |= S_IFREG;
392 fattr->cf_dtype = DT_REG;
393 return -EINVAL; /* EOPNOTSUPP? */
394 }
395
396 tlink = cifs_sb_tlink(cifs_sb);
397 if (IS_ERR(tlink))
398 return PTR_ERR(tlink);
399 tcon = tlink_tcon(tlink);
400
401 rc = CIFSSMBOpen(xid, tcon, path, FILE_OPEN, GENERIC_READ,
402 CREATE_NOT_DIR, &netfid, &oplock, NULL,
403 cifs_sb->local_nls,
404 cifs_sb->mnt_cifs_flags &
405 CIFS_MOUNT_MAP_SPECIAL_CHR);
406 if (rc == 0) {
407 int buf_type = CIFS_NO_BUFFER;
408 /* Read header */
409 io_parms.netfid = netfid;
410 io_parms.pid = current->tgid;
411 io_parms.tcon = tcon;
412 io_parms.offset = 0;
413 io_parms.length = 24;
414 rc = CIFSSMBRead(xid, &io_parms, &bytes_read, &pbuf,
415 &buf_type);
416 if ((rc == 0) && (bytes_read >= 8)) {
417 if (memcmp("IntxBLK", pbuf, 8) == 0) {
418 cFYI(1, "Block device");
419 fattr->cf_mode |= S_IFBLK;
420 fattr->cf_dtype = DT_BLK;
421 if (bytes_read == 24) {
422 /* we have enough to decode dev num */
423 __u64 mjr; /* major */
424 __u64 mnr; /* minor */
425 mjr = le64_to_cpu(*(__le64 *)(pbuf+8));
426 mnr = le64_to_cpu(*(__le64 *)(pbuf+16));
427 fattr->cf_rdev = MKDEV(mjr, mnr);
428 }
429 } else if (memcmp("IntxCHR", pbuf, 8) == 0) {
430 cFYI(1, "Char device");
431 fattr->cf_mode |= S_IFCHR;
432 fattr->cf_dtype = DT_CHR;
433 if (bytes_read == 24) {
434 /* we have enough to decode dev num */
435 __u64 mjr; /* major */
436 __u64 mnr; /* minor */
437 mjr = le64_to_cpu(*(__le64 *)(pbuf+8));
438 mnr = le64_to_cpu(*(__le64 *)(pbuf+16));
439 fattr->cf_rdev = MKDEV(mjr, mnr);
440 }
441 } else if (memcmp("IntxLNK", pbuf, 7) == 0) {
442 cFYI(1, "Symlink");
443 fattr->cf_mode |= S_IFLNK;
444 fattr->cf_dtype = DT_LNK;
445 } else {
446 fattr->cf_mode |= S_IFREG; /* file? */
447 fattr->cf_dtype = DT_REG;
448 rc = -EOPNOTSUPP;
449 }
450 } else {
451 fattr->cf_mode |= S_IFREG; /* then it is a file */
452 fattr->cf_dtype = DT_REG;
453 rc = -EOPNOTSUPP; /* or some unknown SFU type */
454 }
455 CIFSSMBClose(xid, tcon, netfid);
456 }
457 cifs_put_tlink(tlink);
458 return rc;
459 }
460
461 #define SFBITS_MASK (S_ISVTX | S_ISGID | S_ISUID) /* SETFILEBITS valid bits */
462
463 /*
464 * Fetch mode bits as provided by SFU.
465 *
466 * FIXME: Doesn't this clobber the type bit we got from cifs_sfu_type ?
467 */
468 static int cifs_sfu_mode(struct cifs_fattr *fattr, const unsigned char *path,
469 struct cifs_sb_info *cifs_sb, int xid)
470 {
471 #ifdef CONFIG_CIFS_XATTR
472 ssize_t rc;
473 char ea_value[4];
474 __u32 mode;
475 struct tcon_link *tlink;
476 struct cifs_tcon *tcon;
477
478 tlink = cifs_sb_tlink(cifs_sb);
479 if (IS_ERR(tlink))
480 return PTR_ERR(tlink);
481 tcon = tlink_tcon(tlink);
482
483 rc = CIFSSMBQAllEAs(xid, tcon, path, "SETFILEBITS",
484 ea_value, 4 /* size of buf */, cifs_sb->local_nls,
485 cifs_sb->mnt_cifs_flags &
486 CIFS_MOUNT_MAP_SPECIAL_CHR);
487 cifs_put_tlink(tlink);
488 if (rc < 0)
489 return (int)rc;
490 else if (rc > 3) {
491 mode = le32_to_cpu(*((__le32 *)ea_value));
492 fattr->cf_mode &= ~SFBITS_MASK;
493 cFYI(1, "special bits 0%o org mode 0%o", mode,
494 fattr->cf_mode);
495 fattr->cf_mode = (mode & SFBITS_MASK) | fattr->cf_mode;
496 cFYI(1, "special mode bits 0%o", mode);
497 }
498
499 return 0;
500 #else
501 return -EOPNOTSUPP;
502 #endif
503 }
504
505 /* Fill a cifs_fattr struct with info from FILE_ALL_INFO */
506 static void
507 cifs_all_info_to_fattr(struct cifs_fattr *fattr, FILE_ALL_INFO *info,
508 struct cifs_sb_info *cifs_sb, bool adjust_tz)
509 {
510 struct cifs_tcon *tcon = cifs_sb_master_tcon(cifs_sb);
511
512 memset(fattr, 0, sizeof(*fattr));
513 fattr->cf_cifsattrs = le32_to_cpu(info->Attributes);
514 if (info->DeletePending)
515 fattr->cf_flags |= CIFS_FATTR_DELETE_PENDING;
516
517 if (info->LastAccessTime)
518 fattr->cf_atime = cifs_NTtimeToUnix(info->LastAccessTime);
519 else
520 fattr->cf_atime = CURRENT_TIME;
521
522 fattr->cf_ctime = cifs_NTtimeToUnix(info->ChangeTime);
523 fattr->cf_mtime = cifs_NTtimeToUnix(info->LastWriteTime);
524
525 if (adjust_tz) {
526 fattr->cf_ctime.tv_sec += tcon->ses->server->timeAdj;
527 fattr->cf_mtime.tv_sec += tcon->ses->server->timeAdj;
528 }
529
530 fattr->cf_eof = le64_to_cpu(info->EndOfFile);
531 fattr->cf_bytes = le64_to_cpu(info->AllocationSize);
532 fattr->cf_createtime = le64_to_cpu(info->CreationTime);
533
534 if (fattr->cf_cifsattrs & ATTR_DIRECTORY) {
535 fattr->cf_mode = S_IFDIR | cifs_sb->mnt_dir_mode;
536 fattr->cf_dtype = DT_DIR;
537 /*
538 * Server can return wrong NumberOfLinks value for directories
539 * when Unix extensions are disabled - fake it.
540 */
541 fattr->cf_nlink = 2;
542 } else {
543 fattr->cf_mode = S_IFREG | cifs_sb->mnt_file_mode;
544 fattr->cf_dtype = DT_REG;
545
546 /* clear write bits if ATTR_READONLY is set */
547 if (fattr->cf_cifsattrs & ATTR_READONLY)
548 fattr->cf_mode &= ~(S_IWUGO);
549
550 fattr->cf_nlink = le32_to_cpu(info->NumberOfLinks);
551 }
552
553 fattr->cf_uid = cifs_sb->mnt_uid;
554 fattr->cf_gid = cifs_sb->mnt_gid;
555 }
556
557 int cifs_get_file_info(struct file *filp)
558 {
559 int rc;
560 int xid;
561 FILE_ALL_INFO find_data;
562 struct cifs_fattr fattr;
563 struct inode *inode = filp->f_path.dentry->d_inode;
564 struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
565 struct cifsFileInfo *cfile = filp->private_data;
566 struct cifs_tcon *tcon = tlink_tcon(cfile->tlink);
567
568 xid = GetXid();
569 rc = CIFSSMBQFileInfo(xid, tcon, cfile->netfid, &find_data);
570 switch (rc) {
571 case 0:
572 cifs_all_info_to_fattr(&fattr, &find_data, cifs_sb, false);
573 break;
574 case -EREMOTE:
575 cifs_create_dfs_fattr(&fattr, inode->i_sb);
576 rc = 0;
577 break;
578 case -EOPNOTSUPP:
579 case -EINVAL:
580 /*
581 * FIXME: legacy server -- fall back to path-based call?
582 * for now, just skip revalidating and mark inode for
583 * immediate reval.
584 */
585 rc = 0;
586 CIFS_I(inode)->time = 0;
587 default:
588 goto cgfi_exit;
589 }
590
591 /*
592 * don't bother with SFU junk here -- just mark inode as needing
593 * revalidation.
594 */
595 fattr.cf_uniqueid = CIFS_I(inode)->uniqueid;
596 fattr.cf_flags |= CIFS_FATTR_NEED_REVAL;
597 cifs_fattr_to_inode(inode, &fattr);
598 cgfi_exit:
599 FreeXid(xid);
600 return rc;
601 }
602
603 int cifs_get_inode_info(struct inode **pinode,
604 const unsigned char *full_path, FILE_ALL_INFO *pfindData,
605 struct super_block *sb, int xid, const __u16 *pfid)
606 {
607 int rc = 0, tmprc;
608 struct cifs_tcon *pTcon;
609 struct tcon_link *tlink;
610 struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
611 char *buf = NULL;
612 bool adjustTZ = false;
613 struct cifs_fattr fattr;
614
615 tlink = cifs_sb_tlink(cifs_sb);
616 if (IS_ERR(tlink))
617 return PTR_ERR(tlink);
618 pTcon = tlink_tcon(tlink);
619
620 cFYI(1, "Getting info on %s", full_path);
621
622 if ((pfindData == NULL) && (*pinode != NULL)) {
623 if (CIFS_I(*pinode)->clientCanCacheRead) {
624 cFYI(1, "No need to revalidate cached inode sizes");
625 goto cgii_exit;
626 }
627 }
628
629 /* if file info not passed in then get it from server */
630 if (pfindData == NULL) {
631 buf = kmalloc(sizeof(FILE_ALL_INFO), GFP_KERNEL);
632 if (buf == NULL) {
633 rc = -ENOMEM;
634 goto cgii_exit;
635 }
636 pfindData = (FILE_ALL_INFO *)buf;
637
638 /* could do find first instead but this returns more info */
639 rc = CIFSSMBQPathInfo(xid, pTcon, full_path, pfindData,
640 0 /* not legacy */,
641 cifs_sb->local_nls, cifs_sb->mnt_cifs_flags &
642 CIFS_MOUNT_MAP_SPECIAL_CHR);
643 /* BB optimize code so we do not make the above call
644 when server claims no NT SMB support and the above call
645 failed at least once - set flag in tcon or mount */
646 if ((rc == -EOPNOTSUPP) || (rc == -EINVAL)) {
647 rc = SMBQueryInformation(xid, pTcon, full_path,
648 pfindData, cifs_sb->local_nls,
649 cifs_sb->mnt_cifs_flags &
650 CIFS_MOUNT_MAP_SPECIAL_CHR);
651 adjustTZ = true;
652 }
653 }
654
655 if (!rc) {
656 cifs_all_info_to_fattr(&fattr, (FILE_ALL_INFO *) pfindData,
657 cifs_sb, adjustTZ);
658 } else if (rc == -EREMOTE) {
659 cifs_create_dfs_fattr(&fattr, sb);
660 rc = 0;
661 } else {
662 goto cgii_exit;
663 }
664
665 /*
666 * If an inode wasn't passed in, then get the inode number
667 *
668 * Is an i_ino of zero legal? Can we use that to check if the server
669 * supports returning inode numbers? Are there other sanity checks we
670 * can use to ensure that the server is really filling in that field?
671 *
672 * We can not use the IndexNumber field by default from Windows or
673 * Samba (in ALL_INFO buf) but we can request it explicitly. The SNIA
674 * CIFS spec claims that this value is unique within the scope of a
675 * share, and the windows docs hint that it's actually unique
676 * per-machine.
677 *
678 * There may be higher info levels that work but are there Windows
679 * server or network appliances for which IndexNumber field is not
680 * guaranteed unique?
681 */
682 if (*pinode == NULL) {
683 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM) {
684 int rc1 = 0;
685
686 rc1 = CIFSGetSrvInodeNumber(xid, pTcon,
687 full_path, &fattr.cf_uniqueid,
688 cifs_sb->local_nls,
689 cifs_sb->mnt_cifs_flags &
690 CIFS_MOUNT_MAP_SPECIAL_CHR);
691 if (rc1 || !fattr.cf_uniqueid) {
692 cFYI(1, "GetSrvInodeNum rc %d", rc1);
693 fattr.cf_uniqueid = iunique(sb, ROOT_I);
694 cifs_autodisable_serverino(cifs_sb);
695 }
696 } else {
697 fattr.cf_uniqueid = iunique(sb, ROOT_I);
698 }
699 } else {
700 fattr.cf_uniqueid = CIFS_I(*pinode)->uniqueid;
701 }
702
703 /* query for SFU type info if supported and needed */
704 if (fattr.cf_cifsattrs & ATTR_SYSTEM &&
705 cifs_sb->mnt_cifs_flags & CIFS_MOUNT_UNX_EMUL) {
706 tmprc = cifs_sfu_type(&fattr, full_path, cifs_sb, xid);
707 if (tmprc)
708 cFYI(1, "cifs_sfu_type failed: %d", tmprc);
709 }
710
711 #ifdef CONFIG_CIFS_ACL
712 /* fill in 0777 bits from ACL */
713 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_CIFS_ACL) {
714 rc = cifs_acl_to_fattr(cifs_sb, &fattr, *pinode, full_path,
715 pfid);
716 if (rc) {
717 cFYI(1, "%s: Getting ACL failed with error: %d",
718 __func__, rc);
719 goto cgii_exit;
720 }
721 }
722 #endif /* CONFIG_CIFS_ACL */
723
724 /* fill in remaining high mode bits e.g. SUID, VTX */
725 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_UNX_EMUL)
726 cifs_sfu_mode(&fattr, full_path, cifs_sb, xid);
727
728 /* check for Minshall+French symlinks */
729 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MF_SYMLINKS) {
730 tmprc = CIFSCheckMFSymlink(&fattr, full_path, cifs_sb, xid);
731 if (tmprc)
732 cFYI(1, "CIFSCheckMFSymlink: %d", tmprc);
733 }
734
735 if (!*pinode) {
736 *pinode = cifs_iget(sb, &fattr);
737 if (!*pinode)
738 rc = -ENOMEM;
739 } else {
740 cifs_fattr_to_inode(*pinode, &fattr);
741 }
742
743 cgii_exit:
744 kfree(buf);
745 cifs_put_tlink(tlink);
746 return rc;
747 }
748
749 static const struct inode_operations cifs_ipc_inode_ops = {
750 .lookup = cifs_lookup,
751 };
752
753 char *cifs_build_path_to_root(struct smb_vol *vol, struct cifs_sb_info *cifs_sb,
754 struct cifs_tcon *tcon)
755 {
756 int pplen = vol->prepath ? strlen(vol->prepath) : 0;
757 int dfsplen;
758 char *full_path = NULL;
759
760 /* if no prefix path, simply set path to the root of share to "" */
761 if (pplen == 0) {
762 full_path = kmalloc(1, GFP_KERNEL);
763 if (full_path)
764 full_path[0] = 0;
765 return full_path;
766 }
767
768 if (tcon->Flags & SMB_SHARE_IS_IN_DFS)
769 dfsplen = strnlen(tcon->treeName, MAX_TREE_SIZE + 1);
770 else
771 dfsplen = 0;
772
773 full_path = kmalloc(dfsplen + pplen + 1, GFP_KERNEL);
774 if (full_path == NULL)
775 return full_path;
776
777 if (dfsplen)
778 strncpy(full_path, tcon->treeName, dfsplen);
779 strncpy(full_path + dfsplen, vol->prepath, pplen);
780 convert_delimiter(full_path, CIFS_DIR_SEP(cifs_sb));
781 full_path[dfsplen + pplen] = 0; /* add trailing null */
782 return full_path;
783 }
784
785 static int
786 cifs_find_inode(struct inode *inode, void *opaque)
787 {
788 struct cifs_fattr *fattr = (struct cifs_fattr *) opaque;
789
790 /* don't match inode with different uniqueid */
791 if (CIFS_I(inode)->uniqueid != fattr->cf_uniqueid)
792 return 0;
793
794 /* use createtime like an i_generation field */
795 if (CIFS_I(inode)->createtime != fattr->cf_createtime)
796 return 0;
797
798 /* don't match inode of different type */
799 if ((inode->i_mode & S_IFMT) != (fattr->cf_mode & S_IFMT))
800 return 0;
801
802 /* if it's not a directory or has no dentries, then flag it */
803 if (S_ISDIR(inode->i_mode) && !list_empty(&inode->i_dentry))
804 fattr->cf_flags |= CIFS_FATTR_INO_COLLISION;
805
806 return 1;
807 }
808
809 static int
810 cifs_init_inode(struct inode *inode, void *opaque)
811 {
812 struct cifs_fattr *fattr = (struct cifs_fattr *) opaque;
813
814 CIFS_I(inode)->uniqueid = fattr->cf_uniqueid;
815 CIFS_I(inode)->createtime = fattr->cf_createtime;
816 return 0;
817 }
818
819 /*
820 * walk dentry list for an inode and report whether it has aliases that
821 * are hashed. We use this to determine if a directory inode can actually
822 * be used.
823 */
824 static bool
825 inode_has_hashed_dentries(struct inode *inode)
826 {
827 struct dentry *dentry;
828
829 spin_lock(&inode->i_lock);
830 list_for_each_entry(dentry, &inode->i_dentry, d_alias) {
831 if (!d_unhashed(dentry) || IS_ROOT(dentry)) {
832 spin_unlock(&inode->i_lock);
833 return true;
834 }
835 }
836 spin_unlock(&inode->i_lock);
837 return false;
838 }
839
840 /* Given fattrs, get a corresponding inode */
841 struct inode *
842 cifs_iget(struct super_block *sb, struct cifs_fattr *fattr)
843 {
844 unsigned long hash;
845 struct inode *inode;
846
847 retry_iget5_locked:
848 cFYI(1, "looking for uniqueid=%llu", fattr->cf_uniqueid);
849
850 /* hash down to 32-bits on 32-bit arch */
851 hash = cifs_uniqueid_to_ino_t(fattr->cf_uniqueid);
852
853 inode = iget5_locked(sb, hash, cifs_find_inode, cifs_init_inode, fattr);
854 if (inode) {
855 /* was there a potentially problematic inode collision? */
856 if (fattr->cf_flags & CIFS_FATTR_INO_COLLISION) {
857 fattr->cf_flags &= ~CIFS_FATTR_INO_COLLISION;
858
859 if (inode_has_hashed_dentries(inode)) {
860 cifs_autodisable_serverino(CIFS_SB(sb));
861 iput(inode);
862 fattr->cf_uniqueid = iunique(sb, ROOT_I);
863 goto retry_iget5_locked;
864 }
865 }
866
867 cifs_fattr_to_inode(inode, fattr);
868 if (sb->s_flags & MS_NOATIME)
869 inode->i_flags |= S_NOATIME | S_NOCMTIME;
870 if (inode->i_state & I_NEW) {
871 inode->i_ino = hash;
872 if (S_ISREG(inode->i_mode))
873 inode->i_data.backing_dev_info = sb->s_bdi;
874 #ifdef CONFIG_CIFS_FSCACHE
875 /* initialize per-inode cache cookie pointer */
876 CIFS_I(inode)->fscache = NULL;
877 #endif
878 unlock_new_inode(inode);
879 }
880 }
881
882 return inode;
883 }
884
885 /* gets root inode */
886 struct inode *cifs_root_iget(struct super_block *sb)
887 {
888 int xid;
889 struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
890 struct inode *inode = NULL;
891 long rc;
892 struct cifs_tcon *tcon = cifs_sb_master_tcon(cifs_sb);
893
894 xid = GetXid();
895 if (tcon->unix_ext)
896 rc = cifs_get_inode_info_unix(&inode, "", sb, xid);
897 else
898 rc = cifs_get_inode_info(&inode, "", NULL, sb, xid, NULL);
899
900 if (!inode) {
901 inode = ERR_PTR(rc);
902 goto out;
903 }
904
905 #ifdef CONFIG_CIFS_FSCACHE
906 /* populate tcon->resource_id */
907 tcon->resource_id = CIFS_I(inode)->uniqueid;
908 #endif
909
910 if (rc && tcon->ipc) {
911 cFYI(1, "ipc connection - fake read inode");
912 inode->i_mode |= S_IFDIR;
913 set_nlink(inode, 2);
914 inode->i_op = &cifs_ipc_inode_ops;
915 inode->i_fop = &simple_dir_operations;
916 inode->i_uid = cifs_sb->mnt_uid;
917 inode->i_gid = cifs_sb->mnt_gid;
918 } else if (rc) {
919 iget_failed(inode);
920 inode = ERR_PTR(rc);
921 }
922
923 out:
924 /* can not call macro FreeXid here since in a void func
925 * TODO: This is no longer true
926 */
927 _FreeXid(xid);
928 return inode;
929 }
930
931 static int
932 cifs_set_file_info(struct inode *inode, struct iattr *attrs, int xid,
933 char *full_path, __u32 dosattr)
934 {
935 int rc;
936 int oplock = 0;
937 __u16 netfid;
938 __u32 netpid;
939 bool set_time = false;
940 struct cifsFileInfo *open_file;
941 struct cifsInodeInfo *cifsInode = CIFS_I(inode);
942 struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
943 struct tcon_link *tlink = NULL;
944 struct cifs_tcon *pTcon;
945 FILE_BASIC_INFO info_buf;
946
947 if (attrs == NULL)
948 return -EINVAL;
949
950 if (attrs->ia_valid & ATTR_ATIME) {
951 set_time = true;
952 info_buf.LastAccessTime =
953 cpu_to_le64(cifs_UnixTimeToNT(attrs->ia_atime));
954 } else
955 info_buf.LastAccessTime = 0;
956
957 if (attrs->ia_valid & ATTR_MTIME) {
958 set_time = true;
959 info_buf.LastWriteTime =
960 cpu_to_le64(cifs_UnixTimeToNT(attrs->ia_mtime));
961 } else
962 info_buf.LastWriteTime = 0;
963
964 /*
965 * Samba throws this field away, but windows may actually use it.
966 * Do not set ctime unless other time stamps are changed explicitly
967 * (i.e. by utimes()) since we would then have a mix of client and
968 * server times.
969 */
970 if (set_time && (attrs->ia_valid & ATTR_CTIME)) {
971 cFYI(1, "CIFS - CTIME changed");
972 info_buf.ChangeTime =
973 cpu_to_le64(cifs_UnixTimeToNT(attrs->ia_ctime));
974 } else
975 info_buf.ChangeTime = 0;
976
977 info_buf.CreationTime = 0; /* don't change */
978 info_buf.Attributes = cpu_to_le32(dosattr);
979
980 /*
981 * If the file is already open for write, just use that fileid
982 */
983 open_file = find_writable_file(cifsInode, true);
984 if (open_file) {
985 netfid = open_file->netfid;
986 netpid = open_file->pid;
987 pTcon = tlink_tcon(open_file->tlink);
988 goto set_via_filehandle;
989 }
990
991 tlink = cifs_sb_tlink(cifs_sb);
992 if (IS_ERR(tlink)) {
993 rc = PTR_ERR(tlink);
994 tlink = NULL;
995 goto out;
996 }
997 pTcon = tlink_tcon(tlink);
998
999 /*
1000 * NT4 apparently returns success on this call, but it doesn't
1001 * really work.
1002 */
1003 if (!(pTcon->ses->flags & CIFS_SES_NT4)) {
1004 rc = CIFSSMBSetPathInfo(xid, pTcon, full_path,
1005 &info_buf, cifs_sb->local_nls,
1006 cifs_sb->mnt_cifs_flags &
1007 CIFS_MOUNT_MAP_SPECIAL_CHR);
1008 if (rc == 0) {
1009 cifsInode->cifsAttrs = dosattr;
1010 goto out;
1011 } else if (rc != -EOPNOTSUPP && rc != -EINVAL)
1012 goto out;
1013 }
1014
1015 cFYI(1, "calling SetFileInfo since SetPathInfo for "
1016 "times not supported by this server");
1017 rc = CIFSSMBOpen(xid, pTcon, full_path, FILE_OPEN,
1018 SYNCHRONIZE | FILE_WRITE_ATTRIBUTES,
1019 CREATE_NOT_DIR, &netfid, &oplock,
1020 NULL, cifs_sb->local_nls,
1021 cifs_sb->mnt_cifs_flags &
1022 CIFS_MOUNT_MAP_SPECIAL_CHR);
1023
1024 if (rc != 0) {
1025 if (rc == -EIO)
1026 rc = -EINVAL;
1027 goto out;
1028 }
1029
1030 netpid = current->tgid;
1031
1032 set_via_filehandle:
1033 rc = CIFSSMBSetFileInfo(xid, pTcon, &info_buf, netfid, netpid);
1034 if (!rc)
1035 cifsInode->cifsAttrs = dosattr;
1036
1037 if (open_file == NULL)
1038 CIFSSMBClose(xid, pTcon, netfid);
1039 else
1040 cifsFileInfo_put(open_file);
1041 out:
1042 if (tlink != NULL)
1043 cifs_put_tlink(tlink);
1044 return rc;
1045 }
1046
1047 /*
1048 * open the given file (if it isn't already), set the DELETE_ON_CLOSE bit
1049 * and rename it to a random name that hopefully won't conflict with
1050 * anything else.
1051 */
1052 static int
1053 cifs_rename_pending_delete(char *full_path, struct dentry *dentry, int xid)
1054 {
1055 int oplock = 0;
1056 int rc;
1057 __u16 netfid;
1058 struct inode *inode = dentry->d_inode;
1059 struct cifsInodeInfo *cifsInode = CIFS_I(inode);
1060 struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
1061 struct tcon_link *tlink;
1062 struct cifs_tcon *tcon;
1063 __u32 dosattr, origattr;
1064 FILE_BASIC_INFO *info_buf = NULL;
1065
1066 tlink = cifs_sb_tlink(cifs_sb);
1067 if (IS_ERR(tlink))
1068 return PTR_ERR(tlink);
1069 tcon = tlink_tcon(tlink);
1070
1071 rc = CIFSSMBOpen(xid, tcon, full_path, FILE_OPEN,
1072 DELETE|FILE_WRITE_ATTRIBUTES, CREATE_NOT_DIR,
1073 &netfid, &oplock, NULL, cifs_sb->local_nls,
1074 cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR);
1075 if (rc != 0)
1076 goto out;
1077
1078 origattr = cifsInode->cifsAttrs;
1079 if (origattr == 0)
1080 origattr |= ATTR_NORMAL;
1081
1082 dosattr = origattr & ~ATTR_READONLY;
1083 if (dosattr == 0)
1084 dosattr |= ATTR_NORMAL;
1085 dosattr |= ATTR_HIDDEN;
1086
1087 /* set ATTR_HIDDEN and clear ATTR_READONLY, but only if needed */
1088 if (dosattr != origattr) {
1089 info_buf = kzalloc(sizeof(*info_buf), GFP_KERNEL);
1090 if (info_buf == NULL) {
1091 rc = -ENOMEM;
1092 goto out_close;
1093 }
1094 info_buf->Attributes = cpu_to_le32(dosattr);
1095 rc = CIFSSMBSetFileInfo(xid, tcon, info_buf, netfid,
1096 current->tgid);
1097 /* although we would like to mark the file hidden
1098 if that fails we will still try to rename it */
1099 if (rc != 0)
1100 cifsInode->cifsAttrs = dosattr;
1101 else
1102 dosattr = origattr; /* since not able to change them */
1103 }
1104
1105 /* rename the file */
1106 rc = CIFSSMBRenameOpenFile(xid, tcon, netfid, NULL, cifs_sb->local_nls,
1107 cifs_sb->mnt_cifs_flags &
1108 CIFS_MOUNT_MAP_SPECIAL_CHR);
1109 if (rc != 0) {
1110 rc = -ETXTBSY;
1111 goto undo_setattr;
1112 }
1113
1114 /* try to set DELETE_ON_CLOSE */
1115 if (!cifsInode->delete_pending) {
1116 rc = CIFSSMBSetFileDisposition(xid, tcon, true, netfid,
1117 current->tgid);
1118 /*
1119 * some samba versions return -ENOENT when we try to set the
1120 * file disposition here. Likely a samba bug, but work around
1121 * it for now. This means that some cifsXXX files may hang
1122 * around after they shouldn't.
1123 *
1124 * BB: remove this hack after more servers have the fix
1125 */
1126 if (rc == -ENOENT)
1127 rc = 0;
1128 else if (rc != 0) {
1129 rc = -ETXTBSY;
1130 goto undo_rename;
1131 }
1132 cifsInode->delete_pending = true;
1133 }
1134
1135 out_close:
1136 CIFSSMBClose(xid, tcon, netfid);
1137 out:
1138 kfree(info_buf);
1139 cifs_put_tlink(tlink);
1140 return rc;
1141
1142 /*
1143 * reset everything back to the original state. Don't bother
1144 * dealing with errors here since we can't do anything about
1145 * them anyway.
1146 */
1147 undo_rename:
1148 CIFSSMBRenameOpenFile(xid, tcon, netfid, dentry->d_name.name,
1149 cifs_sb->local_nls, cifs_sb->mnt_cifs_flags &
1150 CIFS_MOUNT_MAP_SPECIAL_CHR);
1151 undo_setattr:
1152 if (dosattr != origattr) {
1153 info_buf->Attributes = cpu_to_le32(origattr);
1154 if (!CIFSSMBSetFileInfo(xid, tcon, info_buf, netfid,
1155 current->tgid))
1156 cifsInode->cifsAttrs = origattr;
1157 }
1158
1159 goto out_close;
1160 }
1161
1162
1163 /*
1164 * If dentry->d_inode is null (usually meaning the cached dentry
1165 * is a negative dentry) then we would attempt a standard SMB delete, but
1166 * if that fails we can not attempt the fall back mechanisms on EACCESS
1167 * but will return the EACCESS to the caller. Note that the VFS does not call
1168 * unlink on negative dentries currently.
1169 */
1170 int cifs_unlink(struct inode *dir, struct dentry *dentry)
1171 {
1172 int rc = 0;
1173 int xid;
1174 char *full_path = NULL;
1175 struct inode *inode = dentry->d_inode;
1176 struct cifsInodeInfo *cifs_inode;
1177 struct super_block *sb = dir->i_sb;
1178 struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
1179 struct tcon_link *tlink;
1180 struct cifs_tcon *tcon;
1181 struct iattr *attrs = NULL;
1182 __u32 dosattr = 0, origattr = 0;
1183
1184 cFYI(1, "cifs_unlink, dir=0x%p, dentry=0x%p", dir, dentry);
1185
1186 tlink = cifs_sb_tlink(cifs_sb);
1187 if (IS_ERR(tlink))
1188 return PTR_ERR(tlink);
1189 tcon = tlink_tcon(tlink);
1190
1191 xid = GetXid();
1192
1193 /* Unlink can be called from rename so we can not take the
1194 * sb->s_vfs_rename_mutex here */
1195 full_path = build_path_from_dentry(dentry);
1196 if (full_path == NULL) {
1197 rc = -ENOMEM;
1198 goto unlink_out;
1199 }
1200
1201 if ((tcon->ses->capabilities & CAP_UNIX) &&
1202 (CIFS_UNIX_POSIX_PATH_OPS_CAP &
1203 le64_to_cpu(tcon->fsUnixInfo.Capability))) {
1204 rc = CIFSPOSIXDelFile(xid, tcon, full_path,
1205 SMB_POSIX_UNLINK_FILE_TARGET, cifs_sb->local_nls,
1206 cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR);
1207 cFYI(1, "posix del rc %d", rc);
1208 if ((rc == 0) || (rc == -ENOENT))
1209 goto psx_del_no_retry;
1210 }
1211
1212 retry_std_delete:
1213 rc = CIFSSMBDelFile(xid, tcon, full_path, cifs_sb->local_nls,
1214 cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR);
1215
1216 psx_del_no_retry:
1217 if (!rc) {
1218 if (inode)
1219 drop_nlink(inode);
1220 } else if (rc == -ENOENT) {
1221 d_drop(dentry);
1222 } else if (rc == -ETXTBSY) {
1223 rc = cifs_rename_pending_delete(full_path, dentry, xid);
1224 if (rc == 0)
1225 drop_nlink(inode);
1226 } else if ((rc == -EACCES) && (dosattr == 0) && inode) {
1227 attrs = kzalloc(sizeof(*attrs), GFP_KERNEL);
1228 if (attrs == NULL) {
1229 rc = -ENOMEM;
1230 goto out_reval;
1231 }
1232
1233 /* try to reset dos attributes */
1234 cifs_inode = CIFS_I(inode);
1235 origattr = cifs_inode->cifsAttrs;
1236 if (origattr == 0)
1237 origattr |= ATTR_NORMAL;
1238 dosattr = origattr & ~ATTR_READONLY;
1239 if (dosattr == 0)
1240 dosattr |= ATTR_NORMAL;
1241 dosattr |= ATTR_HIDDEN;
1242
1243 rc = cifs_set_file_info(inode, attrs, xid, full_path, dosattr);
1244 if (rc != 0)
1245 goto out_reval;
1246
1247 goto retry_std_delete;
1248 }
1249
1250 /* undo the setattr if we errored out and it's needed */
1251 if (rc != 0 && dosattr != 0)
1252 cifs_set_file_info(inode, attrs, xid, full_path, origattr);
1253
1254 out_reval:
1255 if (inode) {
1256 cifs_inode = CIFS_I(inode);
1257 cifs_inode->time = 0; /* will force revalidate to get info
1258 when needed */
1259 inode->i_ctime = current_fs_time(sb);
1260 }
1261 dir->i_ctime = dir->i_mtime = current_fs_time(sb);
1262 cifs_inode = CIFS_I(dir);
1263 CIFS_I(dir)->time = 0; /* force revalidate of dir as well */
1264 unlink_out:
1265 kfree(full_path);
1266 kfree(attrs);
1267 FreeXid(xid);
1268 cifs_put_tlink(tlink);
1269 return rc;
1270 }
1271
1272 int cifs_mkdir(struct inode *inode, struct dentry *direntry, umode_t mode)
1273 {
1274 int rc = 0, tmprc;
1275 int xid;
1276 struct cifs_sb_info *cifs_sb;
1277 struct tcon_link *tlink;
1278 struct cifs_tcon *pTcon;
1279 char *full_path = NULL;
1280 struct inode *newinode = NULL;
1281 struct cifs_fattr fattr;
1282
1283 cFYI(1, "In cifs_mkdir, mode = 0x%hx inode = 0x%p", mode, inode);
1284
1285 cifs_sb = CIFS_SB(inode->i_sb);
1286 tlink = cifs_sb_tlink(cifs_sb);
1287 if (IS_ERR(tlink))
1288 return PTR_ERR(tlink);
1289 pTcon = tlink_tcon(tlink);
1290
1291 xid = GetXid();
1292
1293 full_path = build_path_from_dentry(direntry);
1294 if (full_path == NULL) {
1295 rc = -ENOMEM;
1296 goto mkdir_out;
1297 }
1298
1299 if ((pTcon->ses->capabilities & CAP_UNIX) &&
1300 (CIFS_UNIX_POSIX_PATH_OPS_CAP &
1301 le64_to_cpu(pTcon->fsUnixInfo.Capability))) {
1302 u32 oplock = 0;
1303 FILE_UNIX_BASIC_INFO *pInfo =
1304 kzalloc(sizeof(FILE_UNIX_BASIC_INFO), GFP_KERNEL);
1305 if (pInfo == NULL) {
1306 rc = -ENOMEM;
1307 goto mkdir_out;
1308 }
1309
1310 mode &= ~current_umask();
1311 rc = CIFSPOSIXCreate(xid, pTcon, SMB_O_DIRECTORY | SMB_O_CREAT,
1312 mode, NULL /* netfid */, pInfo, &oplock,
1313 full_path, cifs_sb->local_nls,
1314 cifs_sb->mnt_cifs_flags &
1315 CIFS_MOUNT_MAP_SPECIAL_CHR);
1316 if (rc == -EOPNOTSUPP) {
1317 kfree(pInfo);
1318 goto mkdir_retry_old;
1319 } else if (rc) {
1320 cFYI(1, "posix mkdir returned 0x%x", rc);
1321 d_drop(direntry);
1322 } else {
1323 if (pInfo->Type == cpu_to_le32(-1)) {
1324 /* no return info, go query for it */
1325 kfree(pInfo);
1326 goto mkdir_get_info;
1327 }
1328 /*BB check (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SET_UID ) to see if need
1329 to set uid/gid */
1330
1331 cifs_unix_basic_to_fattr(&fattr, pInfo, cifs_sb);
1332 cifs_fill_uniqueid(inode->i_sb, &fattr);
1333 newinode = cifs_iget(inode->i_sb, &fattr);
1334 if (!newinode) {
1335 kfree(pInfo);
1336 goto mkdir_get_info;
1337 }
1338
1339 d_instantiate(direntry, newinode);
1340
1341 #ifdef CONFIG_CIFS_DEBUG2
1342 cFYI(1, "instantiated dentry %p %s to inode %p",
1343 direntry, direntry->d_name.name, newinode);
1344
1345 if (newinode->i_nlink != 2)
1346 cFYI(1, "unexpected number of links %d",
1347 newinode->i_nlink);
1348 #endif
1349 }
1350 kfree(pInfo);
1351 goto mkdir_out;
1352 }
1353 mkdir_retry_old:
1354 /* BB add setting the equivalent of mode via CreateX w/ACLs */
1355 rc = CIFSSMBMkDir(xid, pTcon, full_path, cifs_sb->local_nls,
1356 cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR);
1357 if (rc) {
1358 cFYI(1, "cifs_mkdir returned 0x%x", rc);
1359 d_drop(direntry);
1360 } else {
1361 mkdir_get_info:
1362 if (pTcon->unix_ext)
1363 rc = cifs_get_inode_info_unix(&newinode, full_path,
1364 inode->i_sb, xid);
1365 else
1366 rc = cifs_get_inode_info(&newinode, full_path, NULL,
1367 inode->i_sb, xid, NULL);
1368
1369 d_instantiate(direntry, newinode);
1370 /* setting nlink not necessary except in cases where we
1371 * failed to get it from the server or was set bogus */
1372 if ((direntry->d_inode) && (direntry->d_inode->i_nlink < 2))
1373 set_nlink(direntry->d_inode, 2);
1374
1375 mode &= ~current_umask();
1376 /* must turn on setgid bit if parent dir has it */
1377 if (inode->i_mode & S_ISGID)
1378 mode |= S_ISGID;
1379
1380 if (pTcon->unix_ext) {
1381 struct cifs_unix_set_info_args args = {
1382 .mode = mode,
1383 .ctime = NO_CHANGE_64,
1384 .atime = NO_CHANGE_64,
1385 .mtime = NO_CHANGE_64,
1386 .device = 0,
1387 };
1388 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SET_UID) {
1389 args.uid = (__u64)current_fsuid();
1390 if (inode->i_mode & S_ISGID)
1391 args.gid = (__u64)inode->i_gid;
1392 else
1393 args.gid = (__u64)current_fsgid();
1394 } else {
1395 args.uid = NO_CHANGE_64;
1396 args.gid = NO_CHANGE_64;
1397 }
1398 CIFSSMBUnixSetPathInfo(xid, pTcon, full_path, &args,
1399 cifs_sb->local_nls,
1400 cifs_sb->mnt_cifs_flags &
1401 CIFS_MOUNT_MAP_SPECIAL_CHR);
1402 } else {
1403 if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_CIFS_ACL) &&
1404 (mode & S_IWUGO) == 0) {
1405 FILE_BASIC_INFO pInfo;
1406 struct cifsInodeInfo *cifsInode;
1407 u32 dosattrs;
1408
1409 memset(&pInfo, 0, sizeof(pInfo));
1410 cifsInode = CIFS_I(newinode);
1411 dosattrs = cifsInode->cifsAttrs|ATTR_READONLY;
1412 pInfo.Attributes = cpu_to_le32(dosattrs);
1413 tmprc = CIFSSMBSetPathInfo(xid, pTcon,
1414 full_path, &pInfo,
1415 cifs_sb->local_nls,
1416 cifs_sb->mnt_cifs_flags &
1417 CIFS_MOUNT_MAP_SPECIAL_CHR);
1418 if (tmprc == 0)
1419 cifsInode->cifsAttrs = dosattrs;
1420 }
1421 if (direntry->d_inode) {
1422 if (cifs_sb->mnt_cifs_flags &
1423 CIFS_MOUNT_DYNPERM)
1424 direntry->d_inode->i_mode =
1425 (mode | S_IFDIR);
1426
1427 if (cifs_sb->mnt_cifs_flags &
1428 CIFS_MOUNT_SET_UID) {
1429 direntry->d_inode->i_uid =
1430 current_fsuid();
1431 if (inode->i_mode & S_ISGID)
1432 direntry->d_inode->i_gid =
1433 inode->i_gid;
1434 else
1435 direntry->d_inode->i_gid =
1436 current_fsgid();
1437 }
1438 }
1439 }
1440 }
1441 mkdir_out:
1442 /*
1443 * Force revalidate to get parent dir info when needed since cached
1444 * attributes are invalid now.
1445 */
1446 CIFS_I(inode)->time = 0;
1447 kfree(full_path);
1448 FreeXid(xid);
1449 cifs_put_tlink(tlink);
1450 return rc;
1451 }
1452
1453 int cifs_rmdir(struct inode *inode, struct dentry *direntry)
1454 {
1455 int rc = 0;
1456 int xid;
1457 struct cifs_sb_info *cifs_sb;
1458 struct tcon_link *tlink;
1459 struct cifs_tcon *pTcon;
1460 char *full_path = NULL;
1461 struct cifsInodeInfo *cifsInode;
1462
1463 cFYI(1, "cifs_rmdir, inode = 0x%p", inode);
1464
1465 xid = GetXid();
1466
1467 full_path = build_path_from_dentry(direntry);
1468 if (full_path == NULL) {
1469 rc = -ENOMEM;
1470 goto rmdir_exit;
1471 }
1472
1473 cifs_sb = CIFS_SB(inode->i_sb);
1474 tlink = cifs_sb_tlink(cifs_sb);
1475 if (IS_ERR(tlink)) {
1476 rc = PTR_ERR(tlink);
1477 goto rmdir_exit;
1478 }
1479 pTcon = tlink_tcon(tlink);
1480
1481 rc = CIFSSMBRmDir(xid, pTcon, full_path, cifs_sb->local_nls,
1482 cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR);
1483 cifs_put_tlink(tlink);
1484
1485 if (!rc) {
1486 spin_lock(&direntry->d_inode->i_lock);
1487 i_size_write(direntry->d_inode, 0);
1488 clear_nlink(direntry->d_inode);
1489 spin_unlock(&direntry->d_inode->i_lock);
1490 }
1491
1492 cifsInode = CIFS_I(direntry->d_inode);
1493 /* force revalidate to go get info when needed */
1494 cifsInode->time = 0;
1495
1496 cifsInode = CIFS_I(inode);
1497 /*
1498 * Force revalidate to get parent dir info when needed since cached
1499 * attributes are invalid now.
1500 */
1501 cifsInode->time = 0;
1502
1503 direntry->d_inode->i_ctime = inode->i_ctime = inode->i_mtime =
1504 current_fs_time(inode->i_sb);
1505
1506 rmdir_exit:
1507 kfree(full_path);
1508 FreeXid(xid);
1509 return rc;
1510 }
1511
1512 static int
1513 cifs_do_rename(int xid, struct dentry *from_dentry, const char *fromPath,
1514 struct dentry *to_dentry, const char *toPath)
1515 {
1516 struct cifs_sb_info *cifs_sb = CIFS_SB(from_dentry->d_sb);
1517 struct tcon_link *tlink;
1518 struct cifs_tcon *pTcon;
1519 __u16 srcfid;
1520 int oplock, rc;
1521
1522 tlink = cifs_sb_tlink(cifs_sb);
1523 if (IS_ERR(tlink))
1524 return PTR_ERR(tlink);
1525 pTcon = tlink_tcon(tlink);
1526
1527 /* try path-based rename first */
1528 rc = CIFSSMBRename(xid, pTcon, fromPath, toPath, cifs_sb->local_nls,
1529 cifs_sb->mnt_cifs_flags &
1530 CIFS_MOUNT_MAP_SPECIAL_CHR);
1531
1532 /*
1533 * don't bother with rename by filehandle unless file is busy and
1534 * source Note that cross directory moves do not work with
1535 * rename by filehandle to various Windows servers.
1536 */
1537 if (rc == 0 || rc != -ETXTBSY)
1538 goto do_rename_exit;
1539
1540 /* open-file renames don't work across directories */
1541 if (to_dentry->d_parent != from_dentry->d_parent)
1542 goto do_rename_exit;
1543
1544 /* open the file to be renamed -- we need DELETE perms */
1545 rc = CIFSSMBOpen(xid, pTcon, fromPath, FILE_OPEN, DELETE,
1546 CREATE_NOT_DIR, &srcfid, &oplock, NULL,
1547 cifs_sb->local_nls, cifs_sb->mnt_cifs_flags &
1548 CIFS_MOUNT_MAP_SPECIAL_CHR);
1549
1550 if (rc == 0) {
1551 rc = CIFSSMBRenameOpenFile(xid, pTcon, srcfid,
1552 (const char *) to_dentry->d_name.name,
1553 cifs_sb->local_nls, cifs_sb->mnt_cifs_flags &
1554 CIFS_MOUNT_MAP_SPECIAL_CHR);
1555
1556 CIFSSMBClose(xid, pTcon, srcfid);
1557 }
1558 do_rename_exit:
1559 cifs_put_tlink(tlink);
1560 return rc;
1561 }
1562
1563 int cifs_rename(struct inode *source_dir, struct dentry *source_dentry,
1564 struct inode *target_dir, struct dentry *target_dentry)
1565 {
1566 char *fromName = NULL;
1567 char *toName = NULL;
1568 struct cifs_sb_info *cifs_sb;
1569 struct tcon_link *tlink;
1570 struct cifs_tcon *tcon;
1571 FILE_UNIX_BASIC_INFO *info_buf_source = NULL;
1572 FILE_UNIX_BASIC_INFO *info_buf_target;
1573 int xid, rc, tmprc;
1574
1575 cifs_sb = CIFS_SB(source_dir->i_sb);
1576 tlink = cifs_sb_tlink(cifs_sb);
1577 if (IS_ERR(tlink))
1578 return PTR_ERR(tlink);
1579 tcon = tlink_tcon(tlink);
1580
1581 xid = GetXid();
1582
1583 /*
1584 * we already have the rename sem so we do not need to
1585 * grab it again here to protect the path integrity
1586 */
1587 fromName = build_path_from_dentry(source_dentry);
1588 if (fromName == NULL) {
1589 rc = -ENOMEM;
1590 goto cifs_rename_exit;
1591 }
1592
1593 toName = build_path_from_dentry(target_dentry);
1594 if (toName == NULL) {
1595 rc = -ENOMEM;
1596 goto cifs_rename_exit;
1597 }
1598
1599 rc = cifs_do_rename(xid, source_dentry, fromName,
1600 target_dentry, toName);
1601
1602 if (rc == -EEXIST && tcon->unix_ext) {
1603 /*
1604 * Are src and dst hardlinks of same inode? We can
1605 * only tell with unix extensions enabled
1606 */
1607 info_buf_source =
1608 kmalloc(2 * sizeof(FILE_UNIX_BASIC_INFO),
1609 GFP_KERNEL);
1610 if (info_buf_source == NULL) {
1611 rc = -ENOMEM;
1612 goto cifs_rename_exit;
1613 }
1614
1615 info_buf_target = info_buf_source + 1;
1616 tmprc = CIFSSMBUnixQPathInfo(xid, tcon, fromName,
1617 info_buf_source,
1618 cifs_sb->local_nls,
1619 cifs_sb->mnt_cifs_flags &
1620 CIFS_MOUNT_MAP_SPECIAL_CHR);
1621 if (tmprc != 0)
1622 goto unlink_target;
1623
1624 tmprc = CIFSSMBUnixQPathInfo(xid, tcon, toName,
1625 info_buf_target,
1626 cifs_sb->local_nls,
1627 cifs_sb->mnt_cifs_flags &
1628 CIFS_MOUNT_MAP_SPECIAL_CHR);
1629
1630 if (tmprc == 0 && (info_buf_source->UniqueId ==
1631 info_buf_target->UniqueId)) {
1632 /* same file, POSIX says that this is a noop */
1633 rc = 0;
1634 goto cifs_rename_exit;
1635 }
1636 } /* else ... BB we could add the same check for Windows by
1637 checking the UniqueId via FILE_INTERNAL_INFO */
1638
1639 unlink_target:
1640 /* Try unlinking the target dentry if it's not negative */
1641 if (target_dentry->d_inode && (rc == -EACCES || rc == -EEXIST)) {
1642 tmprc = cifs_unlink(target_dir, target_dentry);
1643 if (tmprc)
1644 goto cifs_rename_exit;
1645
1646 rc = cifs_do_rename(xid, source_dentry, fromName,
1647 target_dentry, toName);
1648 }
1649
1650 cifs_rename_exit:
1651 kfree(info_buf_source);
1652 kfree(fromName);
1653 kfree(toName);
1654 FreeXid(xid);
1655 cifs_put_tlink(tlink);
1656 return rc;
1657 }
1658
1659 static bool
1660 cifs_inode_needs_reval(struct inode *inode)
1661 {
1662 struct cifsInodeInfo *cifs_i = CIFS_I(inode);
1663 struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
1664
1665 if (cifs_i->clientCanCacheRead)
1666 return false;
1667
1668 if (!lookupCacheEnabled)
1669 return true;
1670
1671 if (cifs_i->time == 0)
1672 return true;
1673
1674 if (!time_in_range(jiffies, cifs_i->time,
1675 cifs_i->time + cifs_sb->actimeo))
1676 return true;
1677
1678 /* hardlinked files w/ noserverino get "special" treatment */
1679 if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM) &&
1680 S_ISREG(inode->i_mode) && inode->i_nlink != 1)
1681 return true;
1682
1683 return false;
1684 }
1685
1686 /*
1687 * Zap the cache. Called when invalid_mapping flag is set.
1688 */
1689 int
1690 cifs_invalidate_mapping(struct inode *inode)
1691 {
1692 int rc = 0;
1693 struct cifsInodeInfo *cifs_i = CIFS_I(inode);
1694
1695 cifs_i->invalid_mapping = false;
1696
1697 if (inode->i_mapping && inode->i_mapping->nrpages != 0) {
1698 rc = invalidate_inode_pages2(inode->i_mapping);
1699 if (rc) {
1700 cERROR(1, "%s: could not invalidate inode %p", __func__,
1701 inode);
1702 cifs_i->invalid_mapping = true;
1703 }
1704 }
1705
1706 cifs_fscache_reset_inode_cookie(inode);
1707 return rc;
1708 }
1709
1710 int cifs_revalidate_file_attr(struct file *filp)
1711 {
1712 int rc = 0;
1713 struct inode *inode = filp->f_path.dentry->d_inode;
1714 struct cifsFileInfo *cfile = (struct cifsFileInfo *) filp->private_data;
1715
1716 if (!cifs_inode_needs_reval(inode))
1717 return rc;
1718
1719 if (tlink_tcon(cfile->tlink)->unix_ext)
1720 rc = cifs_get_file_info_unix(filp);
1721 else
1722 rc = cifs_get_file_info(filp);
1723
1724 return rc;
1725 }
1726
1727 int cifs_revalidate_dentry_attr(struct dentry *dentry)
1728 {
1729 int xid;
1730 int rc = 0;
1731 struct inode *inode = dentry->d_inode;
1732 struct super_block *sb = dentry->d_sb;
1733 char *full_path = NULL;
1734
1735 if (inode == NULL)
1736 return -ENOENT;
1737
1738 if (!cifs_inode_needs_reval(inode))
1739 return rc;
1740
1741 xid = GetXid();
1742
1743 /* can not safely grab the rename sem here if rename calls revalidate
1744 since that would deadlock */
1745 full_path = build_path_from_dentry(dentry);
1746 if (full_path == NULL) {
1747 rc = -ENOMEM;
1748 goto out;
1749 }
1750
1751 cFYI(1, "Update attributes: %s inode 0x%p count %d dentry: 0x%p d_time "
1752 "%ld jiffies %ld", full_path, inode, inode->i_count.counter,
1753 dentry, dentry->d_time, jiffies);
1754
1755 if (cifs_sb_master_tcon(CIFS_SB(sb))->unix_ext)
1756 rc = cifs_get_inode_info_unix(&inode, full_path, sb, xid);
1757 else
1758 rc = cifs_get_inode_info(&inode, full_path, NULL, sb,
1759 xid, NULL);
1760
1761 out:
1762 kfree(full_path);
1763 FreeXid(xid);
1764 return rc;
1765 }
1766
1767 int cifs_revalidate_file(struct file *filp)
1768 {
1769 int rc;
1770 struct inode *inode = filp->f_path.dentry->d_inode;
1771
1772 rc = cifs_revalidate_file_attr(filp);
1773 if (rc)
1774 return rc;
1775
1776 if (CIFS_I(inode)->invalid_mapping)
1777 rc = cifs_invalidate_mapping(inode);
1778 return rc;
1779 }
1780
1781 /* revalidate a dentry's inode attributes */
1782 int cifs_revalidate_dentry(struct dentry *dentry)
1783 {
1784 int rc;
1785 struct inode *inode = dentry->d_inode;
1786
1787 rc = cifs_revalidate_dentry_attr(dentry);
1788 if (rc)
1789 return rc;
1790
1791 if (CIFS_I(inode)->invalid_mapping)
1792 rc = cifs_invalidate_mapping(inode);
1793 return rc;
1794 }
1795
1796 int cifs_getattr(struct vfsmount *mnt, struct dentry *dentry,
1797 struct kstat *stat)
1798 {
1799 struct cifs_sb_info *cifs_sb = CIFS_SB(dentry->d_sb);
1800 struct cifs_tcon *tcon = cifs_sb_master_tcon(cifs_sb);
1801 struct inode *inode = dentry->d_inode;
1802 int rc;
1803
1804 /*
1805 * We need to be sure that all dirty pages are written and the server
1806 * has actual ctime, mtime and file length.
1807 */
1808 if (!CIFS_I(inode)->clientCanCacheRead && inode->i_mapping &&
1809 inode->i_mapping->nrpages != 0) {
1810 rc = filemap_fdatawait(inode->i_mapping);
1811 if (rc) {
1812 mapping_set_error(inode->i_mapping, rc);
1813 return rc;
1814 }
1815 }
1816
1817 rc = cifs_revalidate_dentry_attr(dentry);
1818 if (rc)
1819 return rc;
1820
1821 generic_fillattr(inode, stat);
1822 stat->blksize = CIFS_MAX_MSGSIZE;
1823 stat->ino = CIFS_I(inode)->uniqueid;
1824
1825 /*
1826 * If on a multiuser mount without unix extensions, and the admin hasn't
1827 * overridden them, set the ownership to the fsuid/fsgid of the current
1828 * process.
1829 */
1830 if ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MULTIUSER) &&
1831 !tcon->unix_ext) {
1832 if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_OVERR_UID))
1833 stat->uid = current_fsuid();
1834 if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_OVERR_GID))
1835 stat->gid = current_fsgid();
1836 }
1837 return rc;
1838 }
1839
1840 static int cifs_truncate_page(struct address_space *mapping, loff_t from)
1841 {
1842 pgoff_t index = from >> PAGE_CACHE_SHIFT;
1843 unsigned offset = from & (PAGE_CACHE_SIZE - 1);
1844 struct page *page;
1845 int rc = 0;
1846
1847 page = grab_cache_page(mapping, index);
1848 if (!page)
1849 return -ENOMEM;
1850
1851 zero_user_segment(page, offset, PAGE_CACHE_SIZE);
1852 unlock_page(page);
1853 page_cache_release(page);
1854 return rc;
1855 }
1856
1857 static void cifs_setsize(struct inode *inode, loff_t offset)
1858 {
1859 loff_t oldsize;
1860
1861 spin_lock(&inode->i_lock);
1862 oldsize = inode->i_size;
1863 i_size_write(inode, offset);
1864 spin_unlock(&inode->i_lock);
1865
1866 truncate_pagecache(inode, oldsize, offset);
1867 }
1868
1869 static int
1870 cifs_set_file_size(struct inode *inode, struct iattr *attrs,
1871 int xid, char *full_path)
1872 {
1873 int rc;
1874 struct cifsFileInfo *open_file;
1875 struct cifsInodeInfo *cifsInode = CIFS_I(inode);
1876 struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
1877 struct tcon_link *tlink = NULL;
1878 struct cifs_tcon *pTcon = NULL;
1879 struct cifs_io_parms io_parms;
1880
1881 /*
1882 * To avoid spurious oplock breaks from server, in the case of
1883 * inodes that we already have open, avoid doing path based
1884 * setting of file size if we can do it by handle.
1885 * This keeps our caching token (oplock) and avoids timeouts
1886 * when the local oplock break takes longer to flush
1887 * writebehind data than the SMB timeout for the SetPathInfo
1888 * request would allow
1889 */
1890 open_file = find_writable_file(cifsInode, true);
1891 if (open_file) {
1892 __u16 nfid = open_file->netfid;
1893 __u32 npid = open_file->pid;
1894 pTcon = tlink_tcon(open_file->tlink);
1895 rc = CIFSSMBSetFileSize(xid, pTcon, attrs->ia_size, nfid,
1896 npid, false);
1897 cifsFileInfo_put(open_file);
1898 cFYI(1, "SetFSize for attrs rc = %d", rc);
1899 if ((rc == -EINVAL) || (rc == -EOPNOTSUPP)) {
1900 unsigned int bytes_written;
1901
1902 io_parms.netfid = nfid;
1903 io_parms.pid = npid;
1904 io_parms.tcon = pTcon;
1905 io_parms.offset = 0;
1906 io_parms.length = attrs->ia_size;
1907 rc = CIFSSMBWrite(xid, &io_parms, &bytes_written,
1908 NULL, NULL, 1);
1909 cFYI(1, "Wrt seteof rc %d", rc);
1910 }
1911 } else
1912 rc = -EINVAL;
1913
1914 if (rc != 0) {
1915 if (pTcon == NULL) {
1916 tlink = cifs_sb_tlink(cifs_sb);
1917 if (IS_ERR(tlink))
1918 return PTR_ERR(tlink);
1919 pTcon = tlink_tcon(tlink);
1920 }
1921
1922 /* Set file size by pathname rather than by handle
1923 either because no valid, writeable file handle for
1924 it was found or because there was an error setting
1925 it by handle */
1926 rc = CIFSSMBSetEOF(xid, pTcon, full_path, attrs->ia_size,
1927 false, cifs_sb->local_nls,
1928 cifs_sb->mnt_cifs_flags &
1929 CIFS_MOUNT_MAP_SPECIAL_CHR);
1930 cFYI(1, "SetEOF by path (setattrs) rc = %d", rc);
1931 if ((rc == -EINVAL) || (rc == -EOPNOTSUPP)) {
1932 __u16 netfid;
1933 int oplock = 0;
1934
1935 rc = SMBLegacyOpen(xid, pTcon, full_path,
1936 FILE_OPEN, GENERIC_WRITE,
1937 CREATE_NOT_DIR, &netfid, &oplock, NULL,
1938 cifs_sb->local_nls,
1939 cifs_sb->mnt_cifs_flags &
1940 CIFS_MOUNT_MAP_SPECIAL_CHR);
1941 if (rc == 0) {
1942 unsigned int bytes_written;
1943
1944 io_parms.netfid = netfid;
1945 io_parms.pid = current->tgid;
1946 io_parms.tcon = pTcon;
1947 io_parms.offset = 0;
1948 io_parms.length = attrs->ia_size;
1949 rc = CIFSSMBWrite(xid, &io_parms,
1950 &bytes_written,
1951 NULL, NULL, 1);
1952 cFYI(1, "wrt seteof rc %d", rc);
1953 CIFSSMBClose(xid, pTcon, netfid);
1954 }
1955 }
1956 if (tlink)
1957 cifs_put_tlink(tlink);
1958 }
1959
1960 if (rc == 0) {
1961 cifsInode->server_eof = attrs->ia_size;
1962 cifs_setsize(inode, attrs->ia_size);
1963 cifs_truncate_page(inode->i_mapping, inode->i_size);
1964 }
1965
1966 return rc;
1967 }
1968
1969 static int
1970 cifs_setattr_unix(struct dentry *direntry, struct iattr *attrs)
1971 {
1972 int rc;
1973 int xid;
1974 char *full_path = NULL;
1975 struct inode *inode = direntry->d_inode;
1976 struct cifsInodeInfo *cifsInode = CIFS_I(inode);
1977 struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
1978 struct tcon_link *tlink;
1979 struct cifs_tcon *pTcon;
1980 struct cifs_unix_set_info_args *args = NULL;
1981 struct cifsFileInfo *open_file;
1982
1983 cFYI(1, "setattr_unix on file %s attrs->ia_valid=0x%x",
1984 direntry->d_name.name, attrs->ia_valid);
1985
1986 xid = GetXid();
1987
1988 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_PERM)
1989 attrs->ia_valid |= ATTR_FORCE;
1990
1991 rc = inode_change_ok(inode, attrs);
1992 if (rc < 0)
1993 goto out;
1994
1995 full_path = build_path_from_dentry(direntry);
1996 if (full_path == NULL) {
1997 rc = -ENOMEM;
1998 goto out;
1999 }
2000
2001 /*
2002 * Attempt to flush data before changing attributes. We need to do
2003 * this for ATTR_SIZE and ATTR_MTIME for sure, and if we change the
2004 * ownership or mode then we may also need to do this. Here, we take
2005 * the safe way out and just do the flush on all setattr requests. If
2006 * the flush returns error, store it to report later and continue.
2007 *
2008 * BB: This should be smarter. Why bother flushing pages that
2009 * will be truncated anyway? Also, should we error out here if
2010 * the flush returns error?
2011 */
2012 rc = filemap_write_and_wait(inode->i_mapping);
2013 mapping_set_error(inode->i_mapping, rc);
2014 rc = 0;
2015
2016 if (attrs->ia_valid & ATTR_SIZE) {
2017 rc = cifs_set_file_size(inode, attrs, xid, full_path);
2018 if (rc != 0)
2019 goto out;
2020 }
2021
2022 /* skip mode change if it's just for clearing setuid/setgid */
2023 if (attrs->ia_valid & (ATTR_KILL_SUID|ATTR_KILL_SGID))
2024 attrs->ia_valid &= ~ATTR_MODE;
2025
2026 args = kmalloc(sizeof(*args), GFP_KERNEL);
2027 if (args == NULL) {
2028 rc = -ENOMEM;
2029 goto out;
2030 }
2031
2032 /* set up the struct */
2033 if (attrs->ia_valid & ATTR_MODE)
2034 args->mode = attrs->ia_mode;
2035 else
2036 args->mode = NO_CHANGE_64;
2037
2038 if (attrs->ia_valid & ATTR_UID)
2039 args->uid = attrs->ia_uid;
2040 else
2041 args->uid = NO_CHANGE_64;
2042
2043 if (attrs->ia_valid & ATTR_GID)
2044 args->gid = attrs->ia_gid;
2045 else
2046 args->gid = NO_CHANGE_64;
2047
2048 if (attrs->ia_valid & ATTR_ATIME)
2049 args->atime = cifs_UnixTimeToNT(attrs->ia_atime);
2050 else
2051 args->atime = NO_CHANGE_64;
2052
2053 if (attrs->ia_valid & ATTR_MTIME)
2054 args->mtime = cifs_UnixTimeToNT(attrs->ia_mtime);
2055 else
2056 args->mtime = NO_CHANGE_64;
2057
2058 if (attrs->ia_valid & ATTR_CTIME)
2059 args->ctime = cifs_UnixTimeToNT(attrs->ia_ctime);
2060 else
2061 args->ctime = NO_CHANGE_64;
2062
2063 args->device = 0;
2064 open_file = find_writable_file(cifsInode, true);
2065 if (open_file) {
2066 u16 nfid = open_file->netfid;
2067 u32 npid = open_file->pid;
2068 pTcon = tlink_tcon(open_file->tlink);
2069 rc = CIFSSMBUnixSetFileInfo(xid, pTcon, args, nfid, npid);
2070 cifsFileInfo_put(open_file);
2071 } else {
2072 tlink = cifs_sb_tlink(cifs_sb);
2073 if (IS_ERR(tlink)) {
2074 rc = PTR_ERR(tlink);
2075 goto out;
2076 }
2077 pTcon = tlink_tcon(tlink);
2078 rc = CIFSSMBUnixSetPathInfo(xid, pTcon, full_path, args,
2079 cifs_sb->local_nls,
2080 cifs_sb->mnt_cifs_flags &
2081 CIFS_MOUNT_MAP_SPECIAL_CHR);
2082 cifs_put_tlink(tlink);
2083 }
2084
2085 if (rc)
2086 goto out;
2087
2088 if ((attrs->ia_valid & ATTR_SIZE) &&
2089 attrs->ia_size != i_size_read(inode))
2090 truncate_setsize(inode, attrs->ia_size);
2091
2092 setattr_copy(inode, attrs);
2093 mark_inode_dirty(inode);
2094
2095 /* force revalidate when any of these times are set since some
2096 of the fs types (eg ext3, fat) do not have fine enough
2097 time granularity to match protocol, and we do not have a
2098 a way (yet) to query the server fs's time granularity (and
2099 whether it rounds times down).
2100 */
2101 if (attrs->ia_valid & (ATTR_MTIME | ATTR_CTIME))
2102 cifsInode->time = 0;
2103 out:
2104 kfree(args);
2105 kfree(full_path);
2106 FreeXid(xid);
2107 return rc;
2108 }
2109
2110 static int
2111 cifs_setattr_nounix(struct dentry *direntry, struct iattr *attrs)
2112 {
2113 int xid;
2114 uid_t uid = NO_CHANGE_32;
2115 gid_t gid = NO_CHANGE_32;
2116 struct inode *inode = direntry->d_inode;
2117 struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
2118 struct cifsInodeInfo *cifsInode = CIFS_I(inode);
2119 char *full_path = NULL;
2120 int rc = -EACCES;
2121 __u32 dosattr = 0;
2122 __u64 mode = NO_CHANGE_64;
2123
2124 xid = GetXid();
2125
2126 cFYI(1, "setattr on file %s attrs->iavalid 0x%x",
2127 direntry->d_name.name, attrs->ia_valid);
2128
2129 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_PERM)
2130 attrs->ia_valid |= ATTR_FORCE;
2131
2132 rc = inode_change_ok(inode, attrs);
2133 if (rc < 0) {
2134 FreeXid(xid);
2135 return rc;
2136 }
2137
2138 full_path = build_path_from_dentry(direntry);
2139 if (full_path == NULL) {
2140 rc = -ENOMEM;
2141 FreeXid(xid);
2142 return rc;
2143 }
2144
2145 /*
2146 * Attempt to flush data before changing attributes. We need to do
2147 * this for ATTR_SIZE and ATTR_MTIME for sure, and if we change the
2148 * ownership or mode then we may also need to do this. Here, we take
2149 * the safe way out and just do the flush on all setattr requests. If
2150 * the flush returns error, store it to report later and continue.
2151 *
2152 * BB: This should be smarter. Why bother flushing pages that
2153 * will be truncated anyway? Also, should we error out here if
2154 * the flush returns error?
2155 */
2156 rc = filemap_write_and_wait(inode->i_mapping);
2157 mapping_set_error(inode->i_mapping, rc);
2158 rc = 0;
2159
2160 if (attrs->ia_valid & ATTR_SIZE) {
2161 rc = cifs_set_file_size(inode, attrs, xid, full_path);
2162 if (rc != 0)
2163 goto cifs_setattr_exit;
2164 }
2165
2166 if (attrs->ia_valid & ATTR_UID)
2167 uid = attrs->ia_uid;
2168
2169 if (attrs->ia_valid & ATTR_GID)
2170 gid = attrs->ia_gid;
2171
2172 #ifdef CONFIG_CIFS_ACL
2173 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_CIFS_ACL) {
2174 if (uid != NO_CHANGE_32 || gid != NO_CHANGE_32) {
2175 rc = id_mode_to_cifs_acl(inode, full_path, NO_CHANGE_64,
2176 uid, gid);
2177 if (rc) {
2178 cFYI(1, "%s: Setting id failed with error: %d",
2179 __func__, rc);
2180 goto cifs_setattr_exit;
2181 }
2182 }
2183 } else
2184 #endif /* CONFIG_CIFS_ACL */
2185 if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SET_UID))
2186 attrs->ia_valid &= ~(ATTR_UID | ATTR_GID);
2187
2188 /* skip mode change if it's just for clearing setuid/setgid */
2189 if (attrs->ia_valid & (ATTR_KILL_SUID|ATTR_KILL_SGID))
2190 attrs->ia_valid &= ~ATTR_MODE;
2191
2192 if (attrs->ia_valid & ATTR_MODE) {
2193 mode = attrs->ia_mode;
2194 rc = 0;
2195 #ifdef CONFIG_CIFS_ACL
2196 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_CIFS_ACL) {
2197 rc = id_mode_to_cifs_acl(inode, full_path, mode,
2198 NO_CHANGE_32, NO_CHANGE_32);
2199 if (rc) {
2200 cFYI(1, "%s: Setting ACL failed with error: %d",
2201 __func__, rc);
2202 goto cifs_setattr_exit;
2203 }
2204 } else
2205 #endif /* CONFIG_CIFS_ACL */
2206 if (((mode & S_IWUGO) == 0) &&
2207 (cifsInode->cifsAttrs & ATTR_READONLY) == 0) {
2208
2209 dosattr = cifsInode->cifsAttrs | ATTR_READONLY;
2210
2211 /* fix up mode if we're not using dynperm */
2212 if ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DYNPERM) == 0)
2213 attrs->ia_mode = inode->i_mode & ~S_IWUGO;
2214 } else if ((mode & S_IWUGO) &&
2215 (cifsInode->cifsAttrs & ATTR_READONLY)) {
2216
2217 dosattr = cifsInode->cifsAttrs & ~ATTR_READONLY;
2218 /* Attributes of 0 are ignored */
2219 if (dosattr == 0)
2220 dosattr |= ATTR_NORMAL;
2221
2222 /* reset local inode permissions to normal */
2223 if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DYNPERM)) {
2224 attrs->ia_mode &= ~(S_IALLUGO);
2225 if (S_ISDIR(inode->i_mode))
2226 attrs->ia_mode |=
2227 cifs_sb->mnt_dir_mode;
2228 else
2229 attrs->ia_mode |=
2230 cifs_sb->mnt_file_mode;
2231 }
2232 } else if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DYNPERM)) {
2233 /* ignore mode change - ATTR_READONLY hasn't changed */
2234 attrs->ia_valid &= ~ATTR_MODE;
2235 }
2236 }
2237
2238 if (attrs->ia_valid & (ATTR_MTIME|ATTR_ATIME|ATTR_CTIME) ||
2239 ((attrs->ia_valid & ATTR_MODE) && dosattr)) {
2240 rc = cifs_set_file_info(inode, attrs, xid, full_path, dosattr);
2241 /* BB: check for rc = -EOPNOTSUPP and switch to legacy mode */
2242
2243 /* Even if error on time set, no sense failing the call if
2244 the server would set the time to a reasonable value anyway,
2245 and this check ensures that we are not being called from
2246 sys_utimes in which case we ought to fail the call back to
2247 the user when the server rejects the call */
2248 if ((rc) && (attrs->ia_valid &
2249 (ATTR_MODE | ATTR_GID | ATTR_UID | ATTR_SIZE)))
2250 rc = 0;
2251 }
2252
2253 /* do not need local check to inode_check_ok since the server does
2254 that */
2255 if (rc)
2256 goto cifs_setattr_exit;
2257
2258 if ((attrs->ia_valid & ATTR_SIZE) &&
2259 attrs->ia_size != i_size_read(inode))
2260 truncate_setsize(inode, attrs->ia_size);
2261
2262 setattr_copy(inode, attrs);
2263 mark_inode_dirty(inode);
2264
2265 cifs_setattr_exit:
2266 kfree(full_path);
2267 FreeXid(xid);
2268 return rc;
2269 }
2270
2271 int
2272 cifs_setattr(struct dentry *direntry, struct iattr *attrs)
2273 {
2274 struct inode *inode = direntry->d_inode;
2275 struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
2276 struct cifs_tcon *pTcon = cifs_sb_master_tcon(cifs_sb);
2277
2278 if (pTcon->unix_ext)
2279 return cifs_setattr_unix(direntry, attrs);
2280
2281 return cifs_setattr_nounix(direntry, attrs);
2282
2283 /* BB: add cifs_setattr_legacy for really old servers */
2284 }
2285
2286 #if 0
2287 void cifs_delete_inode(struct inode *inode)
2288 {
2289 cFYI(1, "In cifs_delete_inode, inode = 0x%p", inode);
2290 /* may have to add back in if and when safe distributed caching of
2291 directories added e.g. via FindNotify */
2292 }
2293 #endif
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