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Merge branch 'akpm'
[linux-2.6/next.git] / fs / cifs / inode.c
bloba7b2dcd4a53ec1b5404729ea29e2e9ff79fabdeb
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 inode->i_nlink = 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 } else {
538 fattr->cf_mode = S_IFREG | cifs_sb->mnt_file_mode;
539 fattr->cf_dtype = DT_REG;
540
541 /* clear write bits if ATTR_READONLY is set */
542 if (fattr->cf_cifsattrs & ATTR_READONLY)
543 fattr->cf_mode &= ~(S_IWUGO);
544 }
545
546 fattr->cf_nlink = le32_to_cpu(info->NumberOfLinks);
547
548 fattr->cf_uid = cifs_sb->mnt_uid;
549 fattr->cf_gid = cifs_sb->mnt_gid;
550 }
551
552 int cifs_get_file_info(struct file *filp)
553 {
554 int rc;
555 int xid;
556 FILE_ALL_INFO find_data;
557 struct cifs_fattr fattr;
558 struct inode *inode = filp->f_path.dentry->d_inode;
559 struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
560 struct cifsFileInfo *cfile = filp->private_data;
561 struct cifs_tcon *tcon = tlink_tcon(cfile->tlink);
562
563 xid = GetXid();
564 rc = CIFSSMBQFileInfo(xid, tcon, cfile->netfid, &find_data);
565 if (rc == -EOPNOTSUPP || rc == -EINVAL) {
566 /*
567 * FIXME: legacy server -- fall back to path-based call?
568 * for now, just skip revalidating and mark inode for
569 * immediate reval.
570 */
571 rc = 0;
572 CIFS_I(inode)->time = 0;
573 goto cgfi_exit;
574 } else if (rc == -EREMOTE) {
575 cifs_create_dfs_fattr(&fattr, inode->i_sb);
576 rc = 0;
577 } else if (rc)
578 goto cgfi_exit;
579
580 /*
581 * don't bother with SFU junk here -- just mark inode as needing
582 * revalidation.
583 */
584 cifs_all_info_to_fattr(&fattr, &find_data, cifs_sb, false);
585 fattr.cf_uniqueid = CIFS_I(inode)->uniqueid;
586 fattr.cf_flags |= CIFS_FATTR_NEED_REVAL;
587 cifs_fattr_to_inode(inode, &fattr);
588 cgfi_exit:
589 FreeXid(xid);
590 return rc;
591 }
592
593 int cifs_get_inode_info(struct inode **pinode,
594 const unsigned char *full_path, FILE_ALL_INFO *pfindData,
595 struct super_block *sb, int xid, const __u16 *pfid)
596 {
597 int rc = 0, tmprc;
598 struct cifs_tcon *pTcon;
599 struct tcon_link *tlink;
600 struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
601 char *buf = NULL;
602 bool adjustTZ = false;
603 struct cifs_fattr fattr;
604
605 tlink = cifs_sb_tlink(cifs_sb);
606 if (IS_ERR(tlink))
607 return PTR_ERR(tlink);
608 pTcon = tlink_tcon(tlink);
609
610 cFYI(1, "Getting info on %s", full_path);
611
612 if ((pfindData == NULL) && (*pinode != NULL)) {
613 if (CIFS_I(*pinode)->clientCanCacheRead) {
614 cFYI(1, "No need to revalidate cached inode sizes");
615 goto cgii_exit;
616 }
617 }
618
619 /* if file info not passed in then get it from server */
620 if (pfindData == NULL) {
621 buf = kmalloc(sizeof(FILE_ALL_INFO), GFP_KERNEL);
622 if (buf == NULL) {
623 rc = -ENOMEM;
624 goto cgii_exit;
625 }
626 pfindData = (FILE_ALL_INFO *)buf;
627
628 /* could do find first instead but this returns more info */
629 rc = CIFSSMBQPathInfo(xid, pTcon, full_path, pfindData,
630 0 /* not legacy */,
631 cifs_sb->local_nls, cifs_sb->mnt_cifs_flags &
632 CIFS_MOUNT_MAP_SPECIAL_CHR);
633 /* BB optimize code so we do not make the above call
634 when server claims no NT SMB support and the above call
635 failed at least once - set flag in tcon or mount */
636 if ((rc == -EOPNOTSUPP) || (rc == -EINVAL)) {
637 rc = SMBQueryInformation(xid, pTcon, full_path,
638 pfindData, cifs_sb->local_nls,
639 cifs_sb->mnt_cifs_flags &
640 CIFS_MOUNT_MAP_SPECIAL_CHR);
641 adjustTZ = true;
642 }
643 }
644
645 if (!rc) {
646 cifs_all_info_to_fattr(&fattr, (FILE_ALL_INFO *) pfindData,
647 cifs_sb, adjustTZ);
648 } else if (rc == -EREMOTE) {
649 cifs_create_dfs_fattr(&fattr, sb);
650 rc = 0;
651 } else {
652 goto cgii_exit;
653 }
654
655 /*
656 * If an inode wasn't passed in, then get the inode number
657 *
658 * Is an i_ino of zero legal? Can we use that to check if the server
659 * supports returning inode numbers? Are there other sanity checks we
660 * can use to ensure that the server is really filling in that field?
661 *
662 * We can not use the IndexNumber field by default from Windows or
663 * Samba (in ALL_INFO buf) but we can request it explicitly. The SNIA
664 * CIFS spec claims that this value is unique within the scope of a
665 * share, and the windows docs hint that it's actually unique
666 * per-machine.
667 *
668 * There may be higher info levels that work but are there Windows
669 * server or network appliances for which IndexNumber field is not
670 * guaranteed unique?
671 */
672 if (*pinode == NULL) {
673 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM) {
674 int rc1 = 0;
675
676 rc1 = CIFSGetSrvInodeNumber(xid, pTcon,
677 full_path, &fattr.cf_uniqueid,
678 cifs_sb->local_nls,
679 cifs_sb->mnt_cifs_flags &
680 CIFS_MOUNT_MAP_SPECIAL_CHR);
681 if (rc1 || !fattr.cf_uniqueid) {
682 cFYI(1, "GetSrvInodeNum rc %d", rc1);
683 fattr.cf_uniqueid = iunique(sb, ROOT_I);
684 cifs_autodisable_serverino(cifs_sb);
685 }
686 } else {
687 fattr.cf_uniqueid = iunique(sb, ROOT_I);
688 }
689 } else {
690 fattr.cf_uniqueid = CIFS_I(*pinode)->uniqueid;
691 }
692
693 /* query for SFU type info if supported and needed */
694 if (fattr.cf_cifsattrs & ATTR_SYSTEM &&
695 cifs_sb->mnt_cifs_flags & CIFS_MOUNT_UNX_EMUL) {
696 tmprc = cifs_sfu_type(&fattr, full_path, cifs_sb, xid);
697 if (tmprc)
698 cFYI(1, "cifs_sfu_type failed: %d", tmprc);
699 }
700
701 #ifdef CONFIG_CIFS_ACL
702 /* fill in 0777 bits from ACL */
703 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_CIFS_ACL) {
704 rc = cifs_acl_to_fattr(cifs_sb, &fattr, *pinode, full_path,
705 pfid);
706 if (rc) {
707 cFYI(1, "%s: Getting ACL failed with error: %d",
708 __func__, rc);
709 goto cgii_exit;
710 }
711 }
712 #endif /* CONFIG_CIFS_ACL */
713
714 /* fill in remaining high mode bits e.g. SUID, VTX */
715 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_UNX_EMUL)
716 cifs_sfu_mode(&fattr, full_path, cifs_sb, xid);
717
718 /* check for Minshall+French symlinks */
719 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MF_SYMLINKS) {
720 tmprc = CIFSCheckMFSymlink(&fattr, full_path, cifs_sb, xid);
721 if (tmprc)
722 cFYI(1, "CIFSCheckMFSymlink: %d", tmprc);
723 }
724
725 if (!*pinode) {
726 *pinode = cifs_iget(sb, &fattr);
727 if (!*pinode)
728 rc = -ENOMEM;
729 } else {
730 cifs_fattr_to_inode(*pinode, &fattr);
731 }
732
733 cgii_exit:
734 kfree(buf);
735 cifs_put_tlink(tlink);
736 return rc;
737 }
738
739 static const struct inode_operations cifs_ipc_inode_ops = {
740 .lookup = cifs_lookup,
741 };
742
743 char *cifs_build_path_to_root(struct smb_vol *vol, struct cifs_sb_info *cifs_sb,
744 struct cifs_tcon *tcon)
745 {
746 int pplen = vol->prepath ? strlen(vol->prepath) : 0;
747 int dfsplen;
748 char *full_path = NULL;
749
750 /* if no prefix path, simply set path to the root of share to "" */
751 if (pplen == 0) {
752 full_path = kmalloc(1, GFP_KERNEL);
753 if (full_path)
754 full_path[0] = 0;
755 return full_path;
756 }
757
758 if (tcon->Flags & SMB_SHARE_IS_IN_DFS)
759 dfsplen = strnlen(tcon->treeName, MAX_TREE_SIZE + 1);
760 else
761 dfsplen = 0;
762
763 full_path = kmalloc(dfsplen + pplen + 1, GFP_KERNEL);
764 if (full_path == NULL)
765 return full_path;
766
767 if (dfsplen)
768 strncpy(full_path, tcon->treeName, dfsplen);
769 strncpy(full_path + dfsplen, vol->prepath, pplen);
770 convert_delimiter(full_path, CIFS_DIR_SEP(cifs_sb));
771 full_path[dfsplen + pplen] = 0; /* add trailing null */
772 return full_path;
773 }
774
775 static int
776 cifs_find_inode(struct inode *inode, void *opaque)
777 {
778 struct cifs_fattr *fattr = (struct cifs_fattr *) opaque;
779
780 /* don't match inode with different uniqueid */
781 if (CIFS_I(inode)->uniqueid != fattr->cf_uniqueid)
782 return 0;
783
784 /* use createtime like an i_generation field */
785 if (CIFS_I(inode)->createtime != fattr->cf_createtime)
786 return 0;
787
788 /* don't match inode of different type */
789 if ((inode->i_mode & S_IFMT) != (fattr->cf_mode & S_IFMT))
790 return 0;
791
792 /* if it's not a directory or has no dentries, then flag it */
793 if (S_ISDIR(inode->i_mode) && !list_empty(&inode->i_dentry))
794 fattr->cf_flags |= CIFS_FATTR_INO_COLLISION;
795
796 return 1;
797 }
798
799 static int
800 cifs_init_inode(struct inode *inode, void *opaque)
801 {
802 struct cifs_fattr *fattr = (struct cifs_fattr *) opaque;
803
804 CIFS_I(inode)->uniqueid = fattr->cf_uniqueid;
805 CIFS_I(inode)->createtime = fattr->cf_createtime;
806 return 0;
807 }
808
809 /*
810 * walk dentry list for an inode and report whether it has aliases that
811 * are hashed. We use this to determine if a directory inode can actually
812 * be used.
813 */
814 static bool
815 inode_has_hashed_dentries(struct inode *inode)
816 {
817 struct dentry *dentry;
818
819 spin_lock(&inode->i_lock);
820 list_for_each_entry(dentry, &inode->i_dentry, d_alias) {
821 if (!d_unhashed(dentry) || IS_ROOT(dentry)) {
822 spin_unlock(&inode->i_lock);
823 return true;
824 }
825 }
826 spin_unlock(&inode->i_lock);
827 return false;
828 }
829
830 /* Given fattrs, get a corresponding inode */
831 struct inode *
832 cifs_iget(struct super_block *sb, struct cifs_fattr *fattr)
833 {
834 unsigned long hash;
835 struct inode *inode;
836
837 retry_iget5_locked:
838 cFYI(1, "looking for uniqueid=%llu", fattr->cf_uniqueid);
839
840 /* hash down to 32-bits on 32-bit arch */
841 hash = cifs_uniqueid_to_ino_t(fattr->cf_uniqueid);
842
843 inode = iget5_locked(sb, hash, cifs_find_inode, cifs_init_inode, fattr);
844 if (inode) {
845 /* was there a potentially problematic inode collision? */
846 if (fattr->cf_flags & CIFS_FATTR_INO_COLLISION) {
847 fattr->cf_flags &= ~CIFS_FATTR_INO_COLLISION;
848
849 if (inode_has_hashed_dentries(inode)) {
850 cifs_autodisable_serverino(CIFS_SB(sb));
851 iput(inode);
852 fattr->cf_uniqueid = iunique(sb, ROOT_I);
853 goto retry_iget5_locked;
854 }
855 }
856
857 cifs_fattr_to_inode(inode, fattr);
858 if (sb->s_flags & MS_NOATIME)
859 inode->i_flags |= S_NOATIME | S_NOCMTIME;
860 if (inode->i_state & I_NEW) {
861 inode->i_ino = hash;
862 if (S_ISREG(inode->i_mode))
863 inode->i_data.backing_dev_info = sb->s_bdi;
864 #ifdef CONFIG_CIFS_FSCACHE
865 /* initialize per-inode cache cookie pointer */
866 CIFS_I(inode)->fscache = NULL;
867 #endif
868 unlock_new_inode(inode);
869 }
870 }
871
872 return inode;
873 }
874
875 /* gets root inode */
876 struct inode *cifs_root_iget(struct super_block *sb)
877 {
878 int xid;
879 struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
880 struct inode *inode = NULL;
881 long rc;
882 struct cifs_tcon *tcon = cifs_sb_master_tcon(cifs_sb);
883
884 xid = GetXid();
885 if (tcon->unix_ext)
886 rc = cifs_get_inode_info_unix(&inode, "", sb, xid);
887 else
888 rc = cifs_get_inode_info(&inode, "", NULL, sb, xid, NULL);
889
890 if (!inode) {
891 inode = ERR_PTR(rc);
892 goto out;
893 }
894
895 #ifdef CONFIG_CIFS_FSCACHE
896 /* populate tcon->resource_id */
897 tcon->resource_id = CIFS_I(inode)->uniqueid;
898 #endif
899
900 if (rc && tcon->ipc) {
901 cFYI(1, "ipc connection - fake read inode");
902 inode->i_mode |= S_IFDIR;
903 inode->i_nlink = 2;
904 inode->i_op = &cifs_ipc_inode_ops;
905 inode->i_fop = &simple_dir_operations;
906 inode->i_uid = cifs_sb->mnt_uid;
907 inode->i_gid = cifs_sb->mnt_gid;
908 } else if (rc) {
909 iget_failed(inode);
910 inode = ERR_PTR(rc);
911 }
912
913 out:
914 /* can not call macro FreeXid here since in a void func
915 * TODO: This is no longer true
916 */
917 _FreeXid(xid);
918 return inode;
919 }
920
921 static int
922 cifs_set_file_info(struct inode *inode, struct iattr *attrs, int xid,
923 char *full_path, __u32 dosattr)
924 {
925 int rc;
926 int oplock = 0;
927 __u16 netfid;
928 __u32 netpid;
929 bool set_time = false;
930 struct cifsFileInfo *open_file;
931 struct cifsInodeInfo *cifsInode = CIFS_I(inode);
932 struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
933 struct tcon_link *tlink = NULL;
934 struct cifs_tcon *pTcon;
935 FILE_BASIC_INFO info_buf;
936
937 if (attrs == NULL)
938 return -EINVAL;
939
940 if (attrs->ia_valid & ATTR_ATIME) {
941 set_time = true;
942 info_buf.LastAccessTime =
943 cpu_to_le64(cifs_UnixTimeToNT(attrs->ia_atime));
944 } else
945 info_buf.LastAccessTime = 0;
946
947 if (attrs->ia_valid & ATTR_MTIME) {
948 set_time = true;
949 info_buf.LastWriteTime =
950 cpu_to_le64(cifs_UnixTimeToNT(attrs->ia_mtime));
951 } else
952 info_buf.LastWriteTime = 0;
953
954 /*
955 * Samba throws this field away, but windows may actually use it.
956 * Do not set ctime unless other time stamps are changed explicitly
957 * (i.e. by utimes()) since we would then have a mix of client and
958 * server times.
959 */
960 if (set_time && (attrs->ia_valid & ATTR_CTIME)) {
961 cFYI(1, "CIFS - CTIME changed");
962 info_buf.ChangeTime =
963 cpu_to_le64(cifs_UnixTimeToNT(attrs->ia_ctime));
964 } else
965 info_buf.ChangeTime = 0;
966
967 info_buf.CreationTime = 0; /* don't change */
968 info_buf.Attributes = cpu_to_le32(dosattr);
969
970 /*
971 * If the file is already open for write, just use that fileid
972 */
973 open_file = find_writable_file(cifsInode, true);
974 if (open_file) {
975 netfid = open_file->netfid;
976 netpid = open_file->pid;
977 pTcon = tlink_tcon(open_file->tlink);
978 goto set_via_filehandle;
979 }
980
981 tlink = cifs_sb_tlink(cifs_sb);
982 if (IS_ERR(tlink)) {
983 rc = PTR_ERR(tlink);
984 tlink = NULL;
985 goto out;
986 }
987 pTcon = tlink_tcon(tlink);
988
989 /*
990 * NT4 apparently returns success on this call, but it doesn't
991 * really work.
992 */
993 if (!(pTcon->ses->flags & CIFS_SES_NT4)) {
994 rc = CIFSSMBSetPathInfo(xid, pTcon, full_path,
995 &info_buf, cifs_sb->local_nls,
996 cifs_sb->mnt_cifs_flags &
997 CIFS_MOUNT_MAP_SPECIAL_CHR);
998 if (rc == 0) {
999 cifsInode->cifsAttrs = dosattr;
1000 goto out;
1001 } else if (rc != -EOPNOTSUPP && rc != -EINVAL)
1002 goto out;
1003 }
1004
1005 cFYI(1, "calling SetFileInfo since SetPathInfo for "
1006 "times not supported by this server");
1007 rc = CIFSSMBOpen(xid, pTcon, full_path, FILE_OPEN,
1008 SYNCHRONIZE | FILE_WRITE_ATTRIBUTES,
1009 CREATE_NOT_DIR, &netfid, &oplock,
1010 NULL, cifs_sb->local_nls,
1011 cifs_sb->mnt_cifs_flags &
1012 CIFS_MOUNT_MAP_SPECIAL_CHR);
1013
1014 if (rc != 0) {
1015 if (rc == -EIO)
1016 rc = -EINVAL;
1017 goto out;
1018 }
1019
1020 netpid = current->tgid;
1021
1022 set_via_filehandle:
1023 rc = CIFSSMBSetFileInfo(xid, pTcon, &info_buf, netfid, netpid);
1024 if (!rc)
1025 cifsInode->cifsAttrs = dosattr;
1026
1027 if (open_file == NULL)
1028 CIFSSMBClose(xid, pTcon, netfid);
1029 else
1030 cifsFileInfo_put(open_file);
1031 out:
1032 if (tlink != NULL)
1033 cifs_put_tlink(tlink);
1034 return rc;
1035 }
1036
1037 /*
1038 * open the given file (if it isn't already), set the DELETE_ON_CLOSE bit
1039 * and rename it to a random name that hopefully won't conflict with
1040 * anything else.
1041 */
1042 static int
1043 cifs_rename_pending_delete(char *full_path, struct dentry *dentry, int xid)
1044 {
1045 int oplock = 0;
1046 int rc;
1047 __u16 netfid;
1048 struct inode *inode = dentry->d_inode;
1049 struct cifsInodeInfo *cifsInode = CIFS_I(inode);
1050 struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
1051 struct tcon_link *tlink;
1052 struct cifs_tcon *tcon;
1053 __u32 dosattr, origattr;
1054 FILE_BASIC_INFO *info_buf = NULL;
1055
1056 tlink = cifs_sb_tlink(cifs_sb);
1057 if (IS_ERR(tlink))
1058 return PTR_ERR(tlink);
1059 tcon = tlink_tcon(tlink);
1060
1061 rc = CIFSSMBOpen(xid, tcon, full_path, FILE_OPEN,
1062 DELETE|FILE_WRITE_ATTRIBUTES, CREATE_NOT_DIR,
1063 &netfid, &oplock, NULL, cifs_sb->local_nls,
1064 cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR);
1065 if (rc != 0)
1066 goto out;
1067
1068 origattr = cifsInode->cifsAttrs;
1069 if (origattr == 0)
1070 origattr |= ATTR_NORMAL;
1071
1072 dosattr = origattr & ~ATTR_READONLY;
1073 if (dosattr == 0)
1074 dosattr |= ATTR_NORMAL;
1075 dosattr |= ATTR_HIDDEN;
1076
1077 /* set ATTR_HIDDEN and clear ATTR_READONLY, but only if needed */
1078 if (dosattr != origattr) {
1079 info_buf = kzalloc(sizeof(*info_buf), GFP_KERNEL);
1080 if (info_buf == NULL) {
1081 rc = -ENOMEM;
1082 goto out_close;
1083 }
1084 info_buf->Attributes = cpu_to_le32(dosattr);
1085 rc = CIFSSMBSetFileInfo(xid, tcon, info_buf, netfid,
1086 current->tgid);
1087 /* although we would like to mark the file hidden
1088 if that fails we will still try to rename it */
1089 if (rc != 0)
1090 cifsInode->cifsAttrs = dosattr;
1091 else
1092 dosattr = origattr; /* since not able to change them */
1093 }
1094
1095 /* rename the file */
1096 rc = CIFSSMBRenameOpenFile(xid, tcon, netfid, NULL, cifs_sb->local_nls,
1097 cifs_sb->mnt_cifs_flags &
1098 CIFS_MOUNT_MAP_SPECIAL_CHR);
1099 if (rc != 0) {
1100 rc = -ETXTBSY;
1101 goto undo_setattr;
1102 }
1103
1104 /* try to set DELETE_ON_CLOSE */
1105 if (!cifsInode->delete_pending) {
1106 rc = CIFSSMBSetFileDisposition(xid, tcon, true, netfid,
1107 current->tgid);
1108 /*
1109 * some samba versions return -ENOENT when we try to set the
1110 * file disposition here. Likely a samba bug, but work around
1111 * it for now. This means that some cifsXXX files may hang
1112 * around after they shouldn't.
1113 *
1114 * BB: remove this hack after more servers have the fix
1115 */
1116 if (rc == -ENOENT)
1117 rc = 0;
1118 else if (rc != 0) {
1119 rc = -ETXTBSY;
1120 goto undo_rename;
1121 }
1122 cifsInode->delete_pending = true;
1123 }
1124
1125 out_close:
1126 CIFSSMBClose(xid, tcon, netfid);
1127 out:
1128 kfree(info_buf);
1129 cifs_put_tlink(tlink);
1130 return rc;
1131
1132 /*
1133 * reset everything back to the original state. Don't bother
1134 * dealing with errors here since we can't do anything about
1135 * them anyway.
1136 */
1137 undo_rename:
1138 CIFSSMBRenameOpenFile(xid, tcon, netfid, dentry->d_name.name,
1139 cifs_sb->local_nls, cifs_sb->mnt_cifs_flags &
1140 CIFS_MOUNT_MAP_SPECIAL_CHR);
1141 undo_setattr:
1142 if (dosattr != origattr) {
1143 info_buf->Attributes = cpu_to_le32(origattr);
1144 if (!CIFSSMBSetFileInfo(xid, tcon, info_buf, netfid,
1145 current->tgid))
1146 cifsInode->cifsAttrs = origattr;
1147 }
1148
1149 goto out_close;
1150 }
1151
1152
1153 /*
1154 * If dentry->d_inode is null (usually meaning the cached dentry
1155 * is a negative dentry) then we would attempt a standard SMB delete, but
1156 * if that fails we can not attempt the fall back mechanisms on EACCESS
1157 * but will return the EACCESS to the caller. Note that the VFS does not call
1158 * unlink on negative dentries currently.
1159 */
1160 int cifs_unlink(struct inode *dir, struct dentry *dentry)
1161 {
1162 int rc = 0;
1163 int xid;
1164 char *full_path = NULL;
1165 struct inode *inode = dentry->d_inode;
1166 struct cifsInodeInfo *cifs_inode;
1167 struct super_block *sb = dir->i_sb;
1168 struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
1169 struct tcon_link *tlink;
1170 struct cifs_tcon *tcon;
1171 struct iattr *attrs = NULL;
1172 __u32 dosattr = 0, origattr = 0;
1173
1174 cFYI(1, "cifs_unlink, dir=0x%p, dentry=0x%p", dir, dentry);
1175
1176 tlink = cifs_sb_tlink(cifs_sb);
1177 if (IS_ERR(tlink))
1178 return PTR_ERR(tlink);
1179 tcon = tlink_tcon(tlink);
1180
1181 xid = GetXid();
1182
1183 /* Unlink can be called from rename so we can not take the
1184 * sb->s_vfs_rename_mutex here */
1185 full_path = build_path_from_dentry(dentry);
1186 if (full_path == NULL) {
1187 rc = -ENOMEM;
1188 goto unlink_out;
1189 }
1190
1191 if ((tcon->ses->capabilities & CAP_UNIX) &&
1192 (CIFS_UNIX_POSIX_PATH_OPS_CAP &
1193 le64_to_cpu(tcon->fsUnixInfo.Capability))) {
1194 rc = CIFSPOSIXDelFile(xid, tcon, full_path,
1195 SMB_POSIX_UNLINK_FILE_TARGET, cifs_sb->local_nls,
1196 cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR);
1197 cFYI(1, "posix del rc %d", rc);
1198 if ((rc == 0) || (rc == -ENOENT))
1199 goto psx_del_no_retry;
1200 }
1201
1202 retry_std_delete:
1203 rc = CIFSSMBDelFile(xid, tcon, full_path, cifs_sb->local_nls,
1204 cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR);
1205
1206 psx_del_no_retry:
1207 if (!rc) {
1208 if (inode)
1209 drop_nlink(inode);
1210 } else if (rc == -ENOENT) {
1211 d_drop(dentry);
1212 } else if (rc == -ETXTBSY) {
1213 rc = cifs_rename_pending_delete(full_path, dentry, xid);
1214 if (rc == 0)
1215 drop_nlink(inode);
1216 } else if ((rc == -EACCES) && (dosattr == 0) && inode) {
1217 attrs = kzalloc(sizeof(*attrs), GFP_KERNEL);
1218 if (attrs == NULL) {
1219 rc = -ENOMEM;
1220 goto out_reval;
1221 }
1222
1223 /* try to reset dos attributes */
1224 cifs_inode = CIFS_I(inode);
1225 origattr = cifs_inode->cifsAttrs;
1226 if (origattr == 0)
1227 origattr |= ATTR_NORMAL;
1228 dosattr = origattr & ~ATTR_READONLY;
1229 if (dosattr == 0)
1230 dosattr |= ATTR_NORMAL;
1231 dosattr |= ATTR_HIDDEN;
1232
1233 rc = cifs_set_file_info(inode, attrs, xid, full_path, dosattr);
1234 if (rc != 0)
1235 goto out_reval;
1236
1237 goto retry_std_delete;
1238 }
1239
1240 /* undo the setattr if we errored out and it's needed */
1241 if (rc != 0 && dosattr != 0)
1242 cifs_set_file_info(inode, attrs, xid, full_path, origattr);
1243
1244 out_reval:
1245 if (inode) {
1246 cifs_inode = CIFS_I(inode);
1247 cifs_inode->time = 0; /* will force revalidate to get info
1248 when needed */
1249 inode->i_ctime = current_fs_time(sb);
1250 }
1251 dir->i_ctime = dir->i_mtime = current_fs_time(sb);
1252 cifs_inode = CIFS_I(dir);
1253 CIFS_I(dir)->time = 0; /* force revalidate of dir as well */
1254 unlink_out:
1255 kfree(full_path);
1256 kfree(attrs);
1257 FreeXid(xid);
1258 cifs_put_tlink(tlink);
1259 return rc;
1260 }
1261
1262 int cifs_mkdir(struct inode *inode, struct dentry *direntry, int mode)
1263 {
1264 int rc = 0, tmprc;
1265 int xid;
1266 struct cifs_sb_info *cifs_sb;
1267 struct tcon_link *tlink;
1268 struct cifs_tcon *pTcon;
1269 char *full_path = NULL;
1270 struct inode *newinode = NULL;
1271 struct cifs_fattr fattr;
1272
1273 cFYI(1, "In cifs_mkdir, mode = 0x%x inode = 0x%p", mode, inode);
1274
1275 cifs_sb = CIFS_SB(inode->i_sb);
1276 tlink = cifs_sb_tlink(cifs_sb);
1277 if (IS_ERR(tlink))
1278 return PTR_ERR(tlink);
1279 pTcon = tlink_tcon(tlink);
1280
1281 xid = GetXid();
1282
1283 full_path = build_path_from_dentry(direntry);
1284 if (full_path == NULL) {
1285 rc = -ENOMEM;
1286 goto mkdir_out;
1287 }
1288
1289 if ((pTcon->ses->capabilities & CAP_UNIX) &&
1290 (CIFS_UNIX_POSIX_PATH_OPS_CAP &
1291 le64_to_cpu(pTcon->fsUnixInfo.Capability))) {
1292 u32 oplock = 0;
1293 FILE_UNIX_BASIC_INFO *pInfo =
1294 kzalloc(sizeof(FILE_UNIX_BASIC_INFO), GFP_KERNEL);
1295 if (pInfo == NULL) {
1296 rc = -ENOMEM;
1297 goto mkdir_out;
1298 }
1299
1300 mode &= ~current_umask();
1301 rc = CIFSPOSIXCreate(xid, pTcon, SMB_O_DIRECTORY | SMB_O_CREAT,
1302 mode, NULL /* netfid */, pInfo, &oplock,
1303 full_path, cifs_sb->local_nls,
1304 cifs_sb->mnt_cifs_flags &
1305 CIFS_MOUNT_MAP_SPECIAL_CHR);
1306 if (rc == -EOPNOTSUPP) {
1307 kfree(pInfo);
1308 goto mkdir_retry_old;
1309 } else if (rc) {
1310 cFYI(1, "posix mkdir returned 0x%x", rc);
1311 d_drop(direntry);
1312 } else {
1313 if (pInfo->Type == cpu_to_le32(-1)) {
1314 /* no return info, go query for it */
1315 kfree(pInfo);
1316 goto mkdir_get_info;
1317 }
1318 /*BB check (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SET_UID ) to see if need
1319 to set uid/gid */
1320 inc_nlink(inode);
1321
1322 cifs_unix_basic_to_fattr(&fattr, pInfo, cifs_sb);
1323 cifs_fill_uniqueid(inode->i_sb, &fattr);
1324 newinode = cifs_iget(inode->i_sb, &fattr);
1325 if (!newinode) {
1326 kfree(pInfo);
1327 goto mkdir_get_info;
1328 }
1329
1330 d_instantiate(direntry, newinode);
1331
1332 #ifdef CONFIG_CIFS_DEBUG2
1333 cFYI(1, "instantiated dentry %p %s to inode %p",
1334 direntry, direntry->d_name.name, newinode);
1335
1336 if (newinode->i_nlink != 2)
1337 cFYI(1, "unexpected number of links %d",
1338 newinode->i_nlink);
1339 #endif
1340 }
1341 kfree(pInfo);
1342 goto mkdir_out;
1343 }
1344 mkdir_retry_old:
1345 /* BB add setting the equivalent of mode via CreateX w/ACLs */
1346 rc = CIFSSMBMkDir(xid, pTcon, full_path, cifs_sb->local_nls,
1347 cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR);
1348 if (rc) {
1349 cFYI(1, "cifs_mkdir returned 0x%x", rc);
1350 d_drop(direntry);
1351 } else {
1352 mkdir_get_info:
1353 inc_nlink(inode);
1354 if (pTcon->unix_ext)
1355 rc = cifs_get_inode_info_unix(&newinode, full_path,
1356 inode->i_sb, xid);
1357 else
1358 rc = cifs_get_inode_info(&newinode, full_path, NULL,
1359 inode->i_sb, xid, NULL);
1360
1361 d_instantiate(direntry, newinode);
1362 /* setting nlink not necessary except in cases where we
1363 * failed to get it from the server or was set bogus */
1364 if ((direntry->d_inode) && (direntry->d_inode->i_nlink < 2))
1365 direntry->d_inode->i_nlink = 2;
1366
1367 mode &= ~current_umask();
1368 /* must turn on setgid bit if parent dir has it */
1369 if (inode->i_mode & S_ISGID)
1370 mode |= S_ISGID;
1371
1372 if (pTcon->unix_ext) {
1373 struct cifs_unix_set_info_args args = {
1374 .mode = mode,
1375 .ctime = NO_CHANGE_64,
1376 .atime = NO_CHANGE_64,
1377 .mtime = NO_CHANGE_64,
1378 .device = 0,
1379 };
1380 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SET_UID) {
1381 args.uid = (__u64)current_fsuid();
1382 if (inode->i_mode & S_ISGID)
1383 args.gid = (__u64)inode->i_gid;
1384 else
1385 args.gid = (__u64)current_fsgid();
1386 } else {
1387 args.uid = NO_CHANGE_64;
1388 args.gid = NO_CHANGE_64;
1389 }
1390 CIFSSMBUnixSetPathInfo(xid, pTcon, full_path, &args,
1391 cifs_sb->local_nls,
1392 cifs_sb->mnt_cifs_flags &
1393 CIFS_MOUNT_MAP_SPECIAL_CHR);
1394 } else {
1395 if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_CIFS_ACL) &&
1396 (mode & S_IWUGO) == 0) {
1397 FILE_BASIC_INFO pInfo;
1398 struct cifsInodeInfo *cifsInode;
1399 u32 dosattrs;
1400
1401 memset(&pInfo, 0, sizeof(pInfo));
1402 cifsInode = CIFS_I(newinode);
1403 dosattrs = cifsInode->cifsAttrs|ATTR_READONLY;
1404 pInfo.Attributes = cpu_to_le32(dosattrs);
1405 tmprc = CIFSSMBSetPathInfo(xid, pTcon,
1406 full_path, &pInfo,
1407 cifs_sb->local_nls,
1408 cifs_sb->mnt_cifs_flags &
1409 CIFS_MOUNT_MAP_SPECIAL_CHR);
1410 if (tmprc == 0)
1411 cifsInode->cifsAttrs = dosattrs;
1412 }
1413 if (direntry->d_inode) {
1414 if (cifs_sb->mnt_cifs_flags &
1415 CIFS_MOUNT_DYNPERM)
1416 direntry->d_inode->i_mode =
1417 (mode | S_IFDIR);
1418
1419 if (cifs_sb->mnt_cifs_flags &
1420 CIFS_MOUNT_SET_UID) {
1421 direntry->d_inode->i_uid =
1422 current_fsuid();
1423 if (inode->i_mode & S_ISGID)
1424 direntry->d_inode->i_gid =
1425 inode->i_gid;
1426 else
1427 direntry->d_inode->i_gid =
1428 current_fsgid();
1429 }
1430 }
1431 }
1432 }
1433 mkdir_out:
1434 kfree(full_path);
1435 FreeXid(xid);
1436 cifs_put_tlink(tlink);
1437 return rc;
1438 }
1439
1440 int cifs_rmdir(struct inode *inode, struct dentry *direntry)
1441 {
1442 int rc = 0;
1443 int xid;
1444 struct cifs_sb_info *cifs_sb;
1445 struct tcon_link *tlink;
1446 struct cifs_tcon *pTcon;
1447 char *full_path = NULL;
1448 struct cifsInodeInfo *cifsInode;
1449
1450 cFYI(1, "cifs_rmdir, inode = 0x%p", inode);
1451
1452 xid = GetXid();
1453
1454 full_path = build_path_from_dentry(direntry);
1455 if (full_path == NULL) {
1456 rc = -ENOMEM;
1457 goto rmdir_exit;
1458 }
1459
1460 cifs_sb = CIFS_SB(inode->i_sb);
1461 tlink = cifs_sb_tlink(cifs_sb);
1462 if (IS_ERR(tlink)) {
1463 rc = PTR_ERR(tlink);
1464 goto rmdir_exit;
1465 }
1466 pTcon = tlink_tcon(tlink);
1467
1468 rc = CIFSSMBRmDir(xid, pTcon, full_path, cifs_sb->local_nls,
1469 cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR);
1470 cifs_put_tlink(tlink);
1471
1472 if (!rc) {
1473 drop_nlink(inode);
1474 spin_lock(&direntry->d_inode->i_lock);
1475 i_size_write(direntry->d_inode, 0);
1476 clear_nlink(direntry->d_inode);
1477 spin_unlock(&direntry->d_inode->i_lock);
1478 }
1479
1480 cifsInode = CIFS_I(direntry->d_inode);
1481 cifsInode->time = 0; /* force revalidate to go get info when
1482 needed */
1483
1484 cifsInode = CIFS_I(inode);
1485 cifsInode->time = 0; /* force revalidate to get parent dir info
1486 since cached search results now invalid */
1487
1488 direntry->d_inode->i_ctime = inode->i_ctime = inode->i_mtime =
1489 current_fs_time(inode->i_sb);
1490
1491 rmdir_exit:
1492 kfree(full_path);
1493 FreeXid(xid);
1494 return rc;
1495 }
1496
1497 static int
1498 cifs_do_rename(int xid, struct dentry *from_dentry, const char *fromPath,
1499 struct dentry *to_dentry, const char *toPath)
1500 {
1501 struct cifs_sb_info *cifs_sb = CIFS_SB(from_dentry->d_sb);
1502 struct tcon_link *tlink;
1503 struct cifs_tcon *pTcon;
1504 __u16 srcfid;
1505 int oplock, rc;
1506
1507 tlink = cifs_sb_tlink(cifs_sb);
1508 if (IS_ERR(tlink))
1509 return PTR_ERR(tlink);
1510 pTcon = tlink_tcon(tlink);
1511
1512 /* try path-based rename first */
1513 rc = CIFSSMBRename(xid, pTcon, fromPath, toPath, cifs_sb->local_nls,
1514 cifs_sb->mnt_cifs_flags &
1515 CIFS_MOUNT_MAP_SPECIAL_CHR);
1516
1517 /*
1518 * don't bother with rename by filehandle unless file is busy and
1519 * source Note that cross directory moves do not work with
1520 * rename by filehandle to various Windows servers.
1521 */
1522 if (rc == 0 || rc != -ETXTBSY)
1523 goto do_rename_exit;
1524
1525 /* open-file renames don't work across directories */
1526 if (to_dentry->d_parent != from_dentry->d_parent)
1527 goto do_rename_exit;
1528
1529 /* open the file to be renamed -- we need DELETE perms */
1530 rc = CIFSSMBOpen(xid, pTcon, fromPath, FILE_OPEN, DELETE,
1531 CREATE_NOT_DIR, &srcfid, &oplock, NULL,
1532 cifs_sb->local_nls, cifs_sb->mnt_cifs_flags &
1533 CIFS_MOUNT_MAP_SPECIAL_CHR);
1534
1535 if (rc == 0) {
1536 rc = CIFSSMBRenameOpenFile(xid, pTcon, srcfid,
1537 (const char *) to_dentry->d_name.name,
1538 cifs_sb->local_nls, cifs_sb->mnt_cifs_flags &
1539 CIFS_MOUNT_MAP_SPECIAL_CHR);
1540
1541 CIFSSMBClose(xid, pTcon, srcfid);
1542 }
1543 do_rename_exit:
1544 cifs_put_tlink(tlink);
1545 return rc;
1546 }
1547
1548 int cifs_rename(struct inode *source_dir, struct dentry *source_dentry,
1549 struct inode *target_dir, struct dentry *target_dentry)
1550 {
1551 char *fromName = NULL;
1552 char *toName = NULL;
1553 struct cifs_sb_info *cifs_sb;
1554 struct tcon_link *tlink;
1555 struct cifs_tcon *tcon;
1556 FILE_UNIX_BASIC_INFO *info_buf_source = NULL;
1557 FILE_UNIX_BASIC_INFO *info_buf_target;
1558 int xid, rc, tmprc;
1559
1560 cifs_sb = CIFS_SB(source_dir->i_sb);
1561 tlink = cifs_sb_tlink(cifs_sb);
1562 if (IS_ERR(tlink))
1563 return PTR_ERR(tlink);
1564 tcon = tlink_tcon(tlink);
1565
1566 xid = GetXid();
1567
1568 /*
1569 * we already have the rename sem so we do not need to
1570 * grab it again here to protect the path integrity
1571 */
1572 fromName = build_path_from_dentry(source_dentry);
1573 if (fromName == NULL) {
1574 rc = -ENOMEM;
1575 goto cifs_rename_exit;
1576 }
1577
1578 toName = build_path_from_dentry(target_dentry);
1579 if (toName == NULL) {
1580 rc = -ENOMEM;
1581 goto cifs_rename_exit;
1582 }
1583
1584 rc = cifs_do_rename(xid, source_dentry, fromName,
1585 target_dentry, toName);
1586
1587 if (rc == -EEXIST && tcon->unix_ext) {
1588 /*
1589 * Are src and dst hardlinks of same inode? We can
1590 * only tell with unix extensions enabled
1591 */
1592 info_buf_source =
1593 kmalloc(2 * sizeof(FILE_UNIX_BASIC_INFO),
1594 GFP_KERNEL);
1595 if (info_buf_source == NULL) {
1596 rc = -ENOMEM;
1597 goto cifs_rename_exit;
1598 }
1599
1600 info_buf_target = info_buf_source + 1;
1601 tmprc = CIFSSMBUnixQPathInfo(xid, tcon, fromName,
1602 info_buf_source,
1603 cifs_sb->local_nls,
1604 cifs_sb->mnt_cifs_flags &
1605 CIFS_MOUNT_MAP_SPECIAL_CHR);
1606 if (tmprc != 0)
1607 goto unlink_target;
1608
1609 tmprc = CIFSSMBUnixQPathInfo(xid, tcon, toName,
1610 info_buf_target,
1611 cifs_sb->local_nls,
1612 cifs_sb->mnt_cifs_flags &
1613 CIFS_MOUNT_MAP_SPECIAL_CHR);
1614
1615 if (tmprc == 0 && (info_buf_source->UniqueId ==
1616 info_buf_target->UniqueId)) {
1617 /* same file, POSIX says that this is a noop */
1618 rc = 0;
1619 goto cifs_rename_exit;
1620 }
1621 } /* else ... BB we could add the same check for Windows by
1622 checking the UniqueId via FILE_INTERNAL_INFO */
1623
1624 unlink_target:
1625 /* Try unlinking the target dentry if it's not negative */
1626 if (target_dentry->d_inode && (rc == -EACCES || rc == -EEXIST)) {
1627 tmprc = cifs_unlink(target_dir, target_dentry);
1628 if (tmprc)
1629 goto cifs_rename_exit;
1630
1631 rc = cifs_do_rename(xid, source_dentry, fromName,
1632 target_dentry, toName);
1633 }
1634
1635 cifs_rename_exit:
1636 kfree(info_buf_source);
1637 kfree(fromName);
1638 kfree(toName);
1639 FreeXid(xid);
1640 cifs_put_tlink(tlink);
1641 return rc;
1642 }
1643
1644 static bool
1645 cifs_inode_needs_reval(struct inode *inode)
1646 {
1647 struct cifsInodeInfo *cifs_i = CIFS_I(inode);
1648 struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
1649
1650 if (cifs_i->clientCanCacheRead)
1651 return false;
1652
1653 if (!lookupCacheEnabled)
1654 return true;
1655
1656 if (cifs_i->time == 0)
1657 return true;
1658
1659 if (!time_in_range(jiffies, cifs_i->time,
1660 cifs_i->time + cifs_sb->actimeo))
1661 return true;
1662
1663 /* hardlinked files w/ noserverino get "special" treatment */
1664 if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM) &&
1665 S_ISREG(inode->i_mode) && inode->i_nlink != 1)
1666 return true;
1667
1668 return false;
1669 }
1670
1671 /*
1672 * Zap the cache. Called when invalid_mapping flag is set.
1673 */
1674 int
1675 cifs_invalidate_mapping(struct inode *inode)
1676 {
1677 int rc = 0;
1678 struct cifsInodeInfo *cifs_i = CIFS_I(inode);
1679
1680 cifs_i->invalid_mapping = false;
1681
1682 if (inode->i_mapping && inode->i_mapping->nrpages != 0) {
1683 rc = invalidate_inode_pages2(inode->i_mapping);
1684 if (rc) {
1685 cERROR(1, "%s: could not invalidate inode %p", __func__,
1686 inode);
1687 cifs_i->invalid_mapping = true;
1688 }
1689 }
1690
1691 cifs_fscache_reset_inode_cookie(inode);
1692 return rc;
1693 }
1694
1695 int cifs_revalidate_file_attr(struct file *filp)
1696 {
1697 int rc = 0;
1698 struct inode *inode = filp->f_path.dentry->d_inode;
1699 struct cifsFileInfo *cfile = (struct cifsFileInfo *) filp->private_data;
1700
1701 if (!cifs_inode_needs_reval(inode))
1702 return rc;
1703
1704 if (tlink_tcon(cfile->tlink)->unix_ext)
1705 rc = cifs_get_file_info_unix(filp);
1706 else
1707 rc = cifs_get_file_info(filp);
1708
1709 return rc;
1710 }
1711
1712 int cifs_revalidate_dentry_attr(struct dentry *dentry)
1713 {
1714 int xid;
1715 int rc = 0;
1716 struct inode *inode = dentry->d_inode;
1717 struct super_block *sb = dentry->d_sb;
1718 char *full_path = NULL;
1719
1720 if (inode == NULL)
1721 return -ENOENT;
1722
1723 if (!cifs_inode_needs_reval(inode))
1724 return rc;
1725
1726 xid = GetXid();
1727
1728 /* can not safely grab the rename sem here if rename calls revalidate
1729 since that would deadlock */
1730 full_path = build_path_from_dentry(dentry);
1731 if (full_path == NULL) {
1732 rc = -ENOMEM;
1733 goto out;
1734 }
1735
1736 cFYI(1, "Update attributes: %s inode 0x%p count %d dentry: 0x%p d_time "
1737 "%ld jiffies %ld", full_path, inode, inode->i_count.counter,
1738 dentry, dentry->d_time, jiffies);
1739
1740 if (cifs_sb_master_tcon(CIFS_SB(sb))->unix_ext)
1741 rc = cifs_get_inode_info_unix(&inode, full_path, sb, xid);
1742 else
1743 rc = cifs_get_inode_info(&inode, full_path, NULL, sb,
1744 xid, NULL);
1745
1746 out:
1747 kfree(full_path);
1748 FreeXid(xid);
1749 return rc;
1750 }
1751
1752 int cifs_revalidate_file(struct file *filp)
1753 {
1754 int rc;
1755 struct inode *inode = filp->f_path.dentry->d_inode;
1756
1757 rc = cifs_revalidate_file_attr(filp);
1758 if (rc)
1759 return rc;
1760
1761 if (CIFS_I(inode)->invalid_mapping)
1762 rc = cifs_invalidate_mapping(inode);
1763 return rc;
1764 }
1765
1766 /* revalidate a dentry's inode attributes */
1767 int cifs_revalidate_dentry(struct dentry *dentry)
1768 {
1769 int rc;
1770 struct inode *inode = dentry->d_inode;
1771
1772 rc = cifs_revalidate_dentry_attr(dentry);
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 int cifs_getattr(struct vfsmount *mnt, struct dentry *dentry,
1782 struct kstat *stat)
1783 {
1784 struct cifs_sb_info *cifs_sb = CIFS_SB(dentry->d_sb);
1785 struct cifs_tcon *tcon = cifs_sb_master_tcon(cifs_sb);
1786 struct inode *inode = dentry->d_inode;
1787 int rc;
1788
1789 /*
1790 * We need to be sure that all dirty pages are written and the server
1791 * has actual ctime, mtime and file length.
1792 */
1793 if (!CIFS_I(inode)->clientCanCacheRead && inode->i_mapping &&
1794 inode->i_mapping->nrpages != 0) {
1795 rc = filemap_fdatawait(inode->i_mapping);
1796 if (rc) {
1797 mapping_set_error(inode->i_mapping, rc);
1798 return rc;
1799 }
1800 }
1801
1802 rc = cifs_revalidate_dentry_attr(dentry);
1803 if (rc)
1804 return rc;
1805
1806 generic_fillattr(inode, stat);
1807 stat->blksize = CIFS_MAX_MSGSIZE;
1808 stat->ino = CIFS_I(inode)->uniqueid;
1809
1810 /*
1811 * If on a multiuser mount without unix extensions, and the admin hasn't
1812 * overridden them, set the ownership to the fsuid/fsgid of the current
1813 * process.
1814 */
1815 if ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MULTIUSER) &&
1816 !tcon->unix_ext) {
1817 if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_OVERR_UID))
1818 stat->uid = current_fsuid();
1819 if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_OVERR_GID))
1820 stat->gid = current_fsgid();
1821 }
1822 return rc;
1823 }
1824
1825 static int cifs_truncate_page(struct address_space *mapping, loff_t from)
1826 {
1827 pgoff_t index = from >> PAGE_CACHE_SHIFT;
1828 unsigned offset = from & (PAGE_CACHE_SIZE - 1);
1829 struct page *page;
1830 int rc = 0;
1831
1832 page = grab_cache_page(mapping, index);
1833 if (!page)
1834 return -ENOMEM;
1835
1836 zero_user_segment(page, offset, PAGE_CACHE_SIZE);
1837 unlock_page(page);
1838 page_cache_release(page);
1839 return rc;
1840 }
1841
1842 static void cifs_setsize(struct inode *inode, loff_t offset)
1843 {
1844 loff_t oldsize;
1845
1846 spin_lock(&inode->i_lock);
1847 oldsize = inode->i_size;
1848 i_size_write(inode, offset);
1849 spin_unlock(&inode->i_lock);
1850
1851 truncate_pagecache(inode, oldsize, offset);
1852 }
1853
1854 static int
1855 cifs_set_file_size(struct inode *inode, struct iattr *attrs,
1856 int xid, char *full_path)
1857 {
1858 int rc;
1859 struct cifsFileInfo *open_file;
1860 struct cifsInodeInfo *cifsInode = CIFS_I(inode);
1861 struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
1862 struct tcon_link *tlink = NULL;
1863 struct cifs_tcon *pTcon = NULL;
1864 struct cifs_io_parms io_parms;
1865
1866 /*
1867 * To avoid spurious oplock breaks from server, in the case of
1868 * inodes that we already have open, avoid doing path based
1869 * setting of file size if we can do it by handle.
1870 * This keeps our caching token (oplock) and avoids timeouts
1871 * when the local oplock break takes longer to flush
1872 * writebehind data than the SMB timeout for the SetPathInfo
1873 * request would allow
1874 */
1875 open_file = find_writable_file(cifsInode, true);
1876 if (open_file) {
1877 __u16 nfid = open_file->netfid;
1878 __u32 npid = open_file->pid;
1879 pTcon = tlink_tcon(open_file->tlink);
1880 rc = CIFSSMBSetFileSize(xid, pTcon, attrs->ia_size, nfid,
1881 npid, false);
1882 cifsFileInfo_put(open_file);
1883 cFYI(1, "SetFSize for attrs rc = %d", rc);
1884 if ((rc == -EINVAL) || (rc == -EOPNOTSUPP)) {
1885 unsigned int bytes_written;
1886
1887 io_parms.netfid = nfid;
1888 io_parms.pid = npid;
1889 io_parms.tcon = pTcon;
1890 io_parms.offset = 0;
1891 io_parms.length = attrs->ia_size;
1892 rc = CIFSSMBWrite(xid, &io_parms, &bytes_written,
1893 NULL, NULL, 1);
1894 cFYI(1, "Wrt seteof rc %d", rc);
1895 }
1896 } else
1897 rc = -EINVAL;
1898
1899 if (rc != 0) {
1900 if (pTcon == NULL) {
1901 tlink = cifs_sb_tlink(cifs_sb);
1902 if (IS_ERR(tlink))
1903 return PTR_ERR(tlink);
1904 pTcon = tlink_tcon(tlink);
1905 }
1906
1907 /* Set file size by pathname rather than by handle
1908 either because no valid, writeable file handle for
1909 it was found or because there was an error setting
1910 it by handle */
1911 rc = CIFSSMBSetEOF(xid, pTcon, full_path, attrs->ia_size,
1912 false, cifs_sb->local_nls,
1913 cifs_sb->mnt_cifs_flags &
1914 CIFS_MOUNT_MAP_SPECIAL_CHR);
1915 cFYI(1, "SetEOF by path (setattrs) rc = %d", rc);
1916 if ((rc == -EINVAL) || (rc == -EOPNOTSUPP)) {
1917 __u16 netfid;
1918 int oplock = 0;
1919
1920 rc = SMBLegacyOpen(xid, pTcon, full_path,
1921 FILE_OPEN, GENERIC_WRITE,
1922 CREATE_NOT_DIR, &netfid, &oplock, NULL,
1923 cifs_sb->local_nls,
1924 cifs_sb->mnt_cifs_flags &
1925 CIFS_MOUNT_MAP_SPECIAL_CHR);
1926 if (rc == 0) {
1927 unsigned int bytes_written;
1928
1929 io_parms.netfid = netfid;
1930 io_parms.pid = current->tgid;
1931 io_parms.tcon = pTcon;
1932 io_parms.offset = 0;
1933 io_parms.length = attrs->ia_size;
1934 rc = CIFSSMBWrite(xid, &io_parms,
1935 &bytes_written,
1936 NULL, NULL, 1);
1937 cFYI(1, "wrt seteof rc %d", rc);
1938 CIFSSMBClose(xid, pTcon, netfid);
1939 }
1940 }
1941 if (tlink)
1942 cifs_put_tlink(tlink);
1943 }
1944
1945 if (rc == 0) {
1946 cifsInode->server_eof = attrs->ia_size;
1947 cifs_setsize(inode, attrs->ia_size);
1948 cifs_truncate_page(inode->i_mapping, inode->i_size);
1949 }
1950
1951 return rc;
1952 }
1953
1954 static int
1955 cifs_setattr_unix(struct dentry *direntry, struct iattr *attrs)
1956 {
1957 int rc;
1958 int xid;
1959 char *full_path = NULL;
1960 struct inode *inode = direntry->d_inode;
1961 struct cifsInodeInfo *cifsInode = CIFS_I(inode);
1962 struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
1963 struct tcon_link *tlink;
1964 struct cifs_tcon *pTcon;
1965 struct cifs_unix_set_info_args *args = NULL;
1966 struct cifsFileInfo *open_file;
1967
1968 cFYI(1, "setattr_unix on file %s attrs->ia_valid=0x%x",
1969 direntry->d_name.name, attrs->ia_valid);
1970
1971 xid = GetXid();
1972
1973 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_PERM)
1974 attrs->ia_valid |= ATTR_FORCE;
1975
1976 rc = inode_change_ok(inode, attrs);
1977 if (rc < 0)
1978 goto out;
1979
1980 full_path = build_path_from_dentry(direntry);
1981 if (full_path == NULL) {
1982 rc = -ENOMEM;
1983 goto out;
1984 }
1985
1986 /*
1987 * Attempt to flush data before changing attributes. We need to do
1988 * this for ATTR_SIZE and ATTR_MTIME for sure, and if we change the
1989 * ownership or mode then we may also need to do this. Here, we take
1990 * the safe way out and just do the flush on all setattr requests. If
1991 * the flush returns error, store it to report later and continue.
1992 *
1993 * BB: This should be smarter. Why bother flushing pages that
1994 * will be truncated anyway? Also, should we error out here if
1995 * the flush returns error?
1996 */
1997 rc = filemap_write_and_wait(inode->i_mapping);
1998 mapping_set_error(inode->i_mapping, rc);
1999 rc = 0;
2000
2001 if (attrs->ia_valid & ATTR_SIZE) {
2002 rc = cifs_set_file_size(inode, attrs, xid, full_path);
2003 if (rc != 0)
2004 goto out;
2005 }
2006
2007 /* skip mode change if it's just for clearing setuid/setgid */
2008 if (attrs->ia_valid & (ATTR_KILL_SUID|ATTR_KILL_SGID))
2009 attrs->ia_valid &= ~ATTR_MODE;
2010
2011 args = kmalloc(sizeof(*args), GFP_KERNEL);
2012 if (args == NULL) {
2013 rc = -ENOMEM;
2014 goto out;
2015 }
2016
2017 /* set up the struct */
2018 if (attrs->ia_valid & ATTR_MODE)
2019 args->mode = attrs->ia_mode;
2020 else
2021 args->mode = NO_CHANGE_64;
2022
2023 if (attrs->ia_valid & ATTR_UID)
2024 args->uid = attrs->ia_uid;
2025 else
2026 args->uid = NO_CHANGE_64;
2027
2028 if (attrs->ia_valid & ATTR_GID)
2029 args->gid = attrs->ia_gid;
2030 else
2031 args->gid = NO_CHANGE_64;
2032
2033 if (attrs->ia_valid & ATTR_ATIME)
2034 args->atime = cifs_UnixTimeToNT(attrs->ia_atime);
2035 else
2036 args->atime = NO_CHANGE_64;
2037
2038 if (attrs->ia_valid & ATTR_MTIME)
2039 args->mtime = cifs_UnixTimeToNT(attrs->ia_mtime);
2040 else
2041 args->mtime = NO_CHANGE_64;
2042
2043 if (attrs->ia_valid & ATTR_CTIME)
2044 args->ctime = cifs_UnixTimeToNT(attrs->ia_ctime);
2045 else
2046 args->ctime = NO_CHANGE_64;
2047
2048 args->device = 0;
2049 open_file = find_writable_file(cifsInode, true);
2050 if (open_file) {
2051 u16 nfid = open_file->netfid;
2052 u32 npid = open_file->pid;
2053 pTcon = tlink_tcon(open_file->tlink);
2054 rc = CIFSSMBUnixSetFileInfo(xid, pTcon, args, nfid, npid);
2055 cifsFileInfo_put(open_file);
2056 } else {
2057 tlink = cifs_sb_tlink(cifs_sb);
2058 if (IS_ERR(tlink)) {
2059 rc = PTR_ERR(tlink);
2060 goto out;
2061 }
2062 pTcon = tlink_tcon(tlink);
2063 rc = CIFSSMBUnixSetPathInfo(xid, pTcon, full_path, args,
2064 cifs_sb->local_nls,
2065 cifs_sb->mnt_cifs_flags &
2066 CIFS_MOUNT_MAP_SPECIAL_CHR);
2067 cifs_put_tlink(tlink);
2068 }
2069
2070 if (rc)
2071 goto out;
2072
2073 if ((attrs->ia_valid & ATTR_SIZE) &&
2074 attrs->ia_size != i_size_read(inode))
2075 truncate_setsize(inode, attrs->ia_size);
2076
2077 setattr_copy(inode, attrs);
2078 mark_inode_dirty(inode);
2079
2080 /* force revalidate when any of these times are set since some
2081 of the fs types (eg ext3, fat) do not have fine enough
2082 time granularity to match protocol, and we do not have a
2083 a way (yet) to query the server fs's time granularity (and
2084 whether it rounds times down).
2085 */
2086 if (attrs->ia_valid & (ATTR_MTIME | ATTR_CTIME))
2087 cifsInode->time = 0;
2088 out:
2089 kfree(args);
2090 kfree(full_path);
2091 FreeXid(xid);
2092 return rc;
2093 }
2094
2095 static int
2096 cifs_setattr_nounix(struct dentry *direntry, struct iattr *attrs)
2097 {
2098 int xid;
2099 struct inode *inode = direntry->d_inode;
2100 struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
2101 struct cifsInodeInfo *cifsInode = CIFS_I(inode);
2102 char *full_path = NULL;
2103 int rc = -EACCES;
2104 __u32 dosattr = 0;
2105 __u64 mode = NO_CHANGE_64;
2106
2107 xid = GetXid();
2108
2109 cFYI(1, "setattr on file %s attrs->iavalid 0x%x",
2110 direntry->d_name.name, attrs->ia_valid);
2111
2112 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_PERM)
2113 attrs->ia_valid |= ATTR_FORCE;
2114
2115 rc = inode_change_ok(inode, attrs);
2116 if (rc < 0) {
2117 FreeXid(xid);
2118 return rc;
2119 }
2120
2121 full_path = build_path_from_dentry(direntry);
2122 if (full_path == NULL) {
2123 rc = -ENOMEM;
2124 FreeXid(xid);
2125 return rc;
2126 }
2127
2128 /*
2129 * Attempt to flush data before changing attributes. We need to do
2130 * this for ATTR_SIZE and ATTR_MTIME for sure, and if we change the
2131 * ownership or mode then we may also need to do this. Here, we take
2132 * the safe way out and just do the flush on all setattr requests. If
2133 * the flush returns error, store it to report later and continue.
2134 *
2135 * BB: This should be smarter. Why bother flushing pages that
2136 * will be truncated anyway? Also, should we error out here if
2137 * the flush returns error?
2138 */
2139 rc = filemap_write_and_wait(inode->i_mapping);
2140 mapping_set_error(inode->i_mapping, rc);
2141 rc = 0;
2142
2143 if (attrs->ia_valid & ATTR_SIZE) {
2144 rc = cifs_set_file_size(inode, attrs, xid, full_path);
2145 if (rc != 0)
2146 goto cifs_setattr_exit;
2147 }
2148
2149 /*
2150 * Without unix extensions we can't send ownership changes to the
2151 * server, so silently ignore them. This is consistent with how
2152 * local DOS/Windows filesystems behave (VFAT, NTFS, etc). With
2153 * CIFSACL support + proper Windows to Unix idmapping, we may be
2154 * able to support this in the future.
2155 */
2156 if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SET_UID))
2157 attrs->ia_valid &= ~(ATTR_UID | ATTR_GID);
2158
2159 /* skip mode change if it's just for clearing setuid/setgid */
2160 if (attrs->ia_valid & (ATTR_KILL_SUID|ATTR_KILL_SGID))
2161 attrs->ia_valid &= ~ATTR_MODE;
2162
2163 if (attrs->ia_valid & ATTR_MODE) {
2164 cFYI(1, "Mode changed to 0%o", attrs->ia_mode);
2165 mode = attrs->ia_mode;
2166 }
2167
2168 if (attrs->ia_valid & ATTR_MODE) {
2169 rc = 0;
2170 #ifdef CONFIG_CIFS_ACL
2171 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_CIFS_ACL) {
2172 rc = mode_to_cifs_acl(inode, full_path, mode);
2173 if (rc) {
2174 cFYI(1, "%s: Setting ACL failed with error: %d",
2175 __func__, rc);
2176 goto cifs_setattr_exit;
2177 }
2178 } else
2179 #endif /* CONFIG_CIFS_ACL */
2180 if (((mode & S_IWUGO) == 0) &&
2181 (cifsInode->cifsAttrs & ATTR_READONLY) == 0) {
2182
2183 dosattr = cifsInode->cifsAttrs | ATTR_READONLY;
2184
2185 /* fix up mode if we're not using dynperm */
2186 if ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DYNPERM) == 0)
2187 attrs->ia_mode = inode->i_mode & ~S_IWUGO;
2188 } else if ((mode & S_IWUGO) &&
2189 (cifsInode->cifsAttrs & ATTR_READONLY)) {
2190
2191 dosattr = cifsInode->cifsAttrs & ~ATTR_READONLY;
2192 /* Attributes of 0 are ignored */
2193 if (dosattr == 0)
2194 dosattr |= ATTR_NORMAL;
2195
2196 /* reset local inode permissions to normal */
2197 if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DYNPERM)) {
2198 attrs->ia_mode &= ~(S_IALLUGO);
2199 if (S_ISDIR(inode->i_mode))
2200 attrs->ia_mode |=
2201 cifs_sb->mnt_dir_mode;
2202 else
2203 attrs->ia_mode |=
2204 cifs_sb->mnt_file_mode;
2205 }
2206 } else if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DYNPERM)) {
2207 /* ignore mode change - ATTR_READONLY hasn't changed */
2208 attrs->ia_valid &= ~ATTR_MODE;
2209 }
2210 }
2211
2212 if (attrs->ia_valid & (ATTR_MTIME|ATTR_ATIME|ATTR_CTIME) ||
2213 ((attrs->ia_valid & ATTR_MODE) && dosattr)) {
2214 rc = cifs_set_file_info(inode, attrs, xid, full_path, dosattr);
2215 /* BB: check for rc = -EOPNOTSUPP and switch to legacy mode */
2216
2217 /* Even if error on time set, no sense failing the call if
2218 the server would set the time to a reasonable value anyway,
2219 and this check ensures that we are not being called from
2220 sys_utimes in which case we ought to fail the call back to
2221 the user when the server rejects the call */
2222 if ((rc) && (attrs->ia_valid &
2223 (ATTR_MODE | ATTR_GID | ATTR_UID | ATTR_SIZE)))
2224 rc = 0;
2225 }
2226
2227 /* do not need local check to inode_check_ok since the server does
2228 that */
2229 if (rc)
2230 goto cifs_setattr_exit;
2231
2232 if ((attrs->ia_valid & ATTR_SIZE) &&
2233 attrs->ia_size != i_size_read(inode))
2234 truncate_setsize(inode, attrs->ia_size);
2235
2236 setattr_copy(inode, attrs);
2237 mark_inode_dirty(inode);
2238
2239 cifs_setattr_exit:
2240 kfree(full_path);
2241 FreeXid(xid);
2242 return rc;
2243 }
2244
2245 int
2246 cifs_setattr(struct dentry *direntry, struct iattr *attrs)
2247 {
2248 struct inode *inode = direntry->d_inode;
2249 struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
2250 struct cifs_tcon *pTcon = cifs_sb_master_tcon(cifs_sb);
2251
2252 if (pTcon->unix_ext)
2253 return cifs_setattr_unix(direntry, attrs);
2254
2255 return cifs_setattr_nounix(direntry, attrs);
2256
2257 /* BB: add cifs_setattr_legacy for really old servers */
2258 }
2259
2260 #if 0
2261 void cifs_delete_inode(struct inode *inode)
2262 {
2263 cFYI(1, "In cifs_delete_inode, inode = 0x%p", inode);
2264 /* may have to add back in if and when safe distributed caching of
2265 directories added e.g. via FindNotify */
2266 }
2267 #endif
linux-next