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