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[CIFS] remove unused variable
[deliverable/linux.git] / fs / cifs / inode.c
1 /*
2 * fs/cifs/inode.c
3 *
4 * Copyright (C) International Business Machines Corp., 2002,2007
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/pagemap.h>
24 #include <asm/div64.h>
25 #include "cifsfs.h"
26 #include "cifspdu.h"
27 #include "cifsglob.h"
28 #include "cifsproto.h"
29 #include "cifs_debug.h"
30 #include "cifs_fs_sb.h"
31
32
33 static void cifs_set_ops(struct inode *inode)
34 {
35 struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
36
37 switch (inode->i_mode & S_IFMT) {
38 case S_IFREG:
39 inode->i_op = &cifs_file_inode_ops;
40 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DIRECT_IO) {
41 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_BRL)
42 inode->i_fop = &cifs_file_direct_nobrl_ops;
43 else
44 inode->i_fop = &cifs_file_direct_ops;
45 } else if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_BRL)
46 inode->i_fop = &cifs_file_nobrl_ops;
47 else { /* not direct, send byte range locks */
48 inode->i_fop = &cifs_file_ops;
49 }
50
51
52 /* check if server can support readpages */
53 if (cifs_sb->tcon->ses->server->maxBuf <
54 PAGE_CACHE_SIZE + MAX_CIFS_HDR_SIZE)
55 inode->i_data.a_ops = &cifs_addr_ops_smallbuf;
56 else
57 inode->i_data.a_ops = &cifs_addr_ops;
58 break;
59 case S_IFDIR:
60 inode->i_op = &cifs_dir_inode_ops;
61 inode->i_fop = &cifs_dir_ops;
62 break;
63 case S_IFLNK:
64 inode->i_op = &cifs_symlink_inode_ops;
65 break;
66 default:
67 init_special_inode(inode, inode->i_mode, inode->i_rdev);
68 break;
69 }
70 }
71
72 static void cifs_unix_info_to_inode(struct inode *inode,
73 FILE_UNIX_BASIC_INFO *info, int force_uid_gid)
74 {
75 struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
76 struct cifsInodeInfo *cifsInfo = CIFS_I(inode);
77 __u64 num_of_bytes = le64_to_cpu(info->NumOfBytes);
78 __u64 end_of_file = le64_to_cpu(info->EndOfFile);
79
80 inode->i_atime = cifs_NTtimeToUnix(le64_to_cpu(info->LastAccessTime));
81 inode->i_mtime =
82 cifs_NTtimeToUnix(le64_to_cpu(info->LastModificationTime));
83 inode->i_ctime = cifs_NTtimeToUnix(le64_to_cpu(info->LastStatusChange));
84 inode->i_mode = le64_to_cpu(info->Permissions);
85
86 /*
87 * Since we set the inode type below we need to mask off
88 * to avoid strange results if bits set above.
89 */
90 inode->i_mode &= ~S_IFMT;
91 switch (le32_to_cpu(info->Type)) {
92 case UNIX_FILE:
93 inode->i_mode |= S_IFREG;
94 break;
95 case UNIX_SYMLINK:
96 inode->i_mode |= S_IFLNK;
97 break;
98 case UNIX_DIR:
99 inode->i_mode |= S_IFDIR;
100 break;
101 case UNIX_CHARDEV:
102 inode->i_mode |= S_IFCHR;
103 inode->i_rdev = MKDEV(le64_to_cpu(info->DevMajor),
104 le64_to_cpu(info->DevMinor) & MINORMASK);
105 break;
106 case UNIX_BLOCKDEV:
107 inode->i_mode |= S_IFBLK;
108 inode->i_rdev = MKDEV(le64_to_cpu(info->DevMajor),
109 le64_to_cpu(info->DevMinor) & MINORMASK);
110 break;
111 case UNIX_FIFO:
112 inode->i_mode |= S_IFIFO;
113 break;
114 case UNIX_SOCKET:
115 inode->i_mode |= S_IFSOCK;
116 break;
117 default:
118 /* safest to call it a file if we do not know */
119 inode->i_mode |= S_IFREG;
120 cFYI(1, ("unknown type %d", le32_to_cpu(info->Type)));
121 break;
122 }
123
124 if ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_OVERR_UID) &&
125 !force_uid_gid)
126 inode->i_uid = cifs_sb->mnt_uid;
127 else
128 inode->i_uid = le64_to_cpu(info->Uid);
129
130 if ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_OVERR_GID) &&
131 !force_uid_gid)
132 inode->i_gid = cifs_sb->mnt_gid;
133 else
134 inode->i_gid = le64_to_cpu(info->Gid);
135
136 inode->i_nlink = le64_to_cpu(info->Nlinks);
137
138 spin_lock(&inode->i_lock);
139 if (is_size_safe_to_change(cifsInfo, end_of_file)) {
140 /*
141 * We can not safely change the file size here if the client
142 * is writing to it due to potential races.
143 */
144 i_size_write(inode, end_of_file);
145
146 /*
147 * i_blocks is not related to (i_size / i_blksize),
148 * but instead 512 byte (2**9) size is required for
149 * calculating num blocks.
150 */
151 inode->i_blocks = (512 - 1 + num_of_bytes) >> 9;
152 }
153 spin_unlock(&inode->i_lock);
154 }
155
156 int cifs_get_inode_info_unix(struct inode **pinode,
157 const unsigned char *search_path, struct super_block *sb, int xid)
158 {
159 int rc = 0;
160 FILE_UNIX_BASIC_INFO findData;
161 struct cifsTconInfo *pTcon;
162 struct inode *inode;
163 struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
164 char *tmp_path;
165
166 pTcon = cifs_sb->tcon;
167 cFYI(1, ("Getting info on %s", search_path));
168 /* could have done a find first instead but this returns more info */
169 rc = CIFSSMBUnixQPathInfo(xid, pTcon, search_path, &findData,
170 cifs_sb->local_nls, cifs_sb->mnt_cifs_flags &
171 CIFS_MOUNT_MAP_SPECIAL_CHR);
172 /* dump_mem("\nUnixQPathInfo return data", &findData,
173 sizeof(findData)); */
174 if (rc) {
175 if (rc == -EREMOTE) {
176 tmp_path =
177 kmalloc(strnlen(pTcon->treeName,
178 MAX_TREE_SIZE + 1) +
179 strnlen(search_path, MAX_PATHCONF) + 1,
180 GFP_KERNEL);
181 if (tmp_path == NULL)
182 return -ENOMEM;
183
184 /* have to skip first of the double backslash of
185 UNC name */
186 strncpy(tmp_path, pTcon->treeName, MAX_TREE_SIZE);
187 strncat(tmp_path, search_path, MAX_PATHCONF);
188 rc = connect_to_dfs_path(xid, pTcon->ses,
189 /* treename + */ tmp_path,
190 cifs_sb->local_nls,
191 cifs_sb->mnt_cifs_flags &
192 CIFS_MOUNT_MAP_SPECIAL_CHR);
193 kfree(tmp_path);
194
195 /* BB fix up inode etc. */
196 } else if (rc) {
197 return rc;
198 }
199 } else {
200 struct cifsInodeInfo *cifsInfo;
201 __u64 num_of_bytes = le64_to_cpu(findData.NumOfBytes);
202 __u64 end_of_file = le64_to_cpu(findData.EndOfFile);
203
204 /* get new inode */
205 if (*pinode == NULL) {
206 *pinode = new_inode(sb);
207 if (*pinode == NULL)
208 return -ENOMEM;
209 /* Is an i_ino of zero legal? */
210 /* Are there sanity checks we can use to ensure that
211 the server is really filling in that field? */
212 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM) {
213 (*pinode)->i_ino =
214 (unsigned long)findData.UniqueId;
215 } /* note ino incremented to unique num in new_inode */
216 if (sb->s_flags & MS_NOATIME)
217 (*pinode)->i_flags |= S_NOATIME | S_NOCMTIME;
218
219 insert_inode_hash(*pinode);
220 }
221
222 inode = *pinode;
223 cifsInfo = CIFS_I(inode);
224
225 cFYI(1, ("Old time %ld", cifsInfo->time));
226 cifsInfo->time = jiffies;
227 cFYI(1, ("New time %ld", cifsInfo->time));
228 /* this is ok to set on every inode revalidate */
229 atomic_set(&cifsInfo->inUse, 1);
230
231 cifs_unix_info_to_inode(inode, &findData, 0);
232
233
234 if (num_of_bytes < end_of_file)
235 cFYI(1, ("allocation size less than end of file"));
236 cFYI(1, ("Size %ld and blocks %llu",
237 (unsigned long) inode->i_size,
238 (unsigned long long)inode->i_blocks));
239
240 cifs_set_ops(inode);
241 }
242 return rc;
243 }
244
245 static int decode_sfu_inode(struct inode *inode, __u64 size,
246 const unsigned char *path,
247 struct cifs_sb_info *cifs_sb, int xid)
248 {
249 int rc;
250 int oplock = FALSE;
251 __u16 netfid;
252 struct cifsTconInfo *pTcon = cifs_sb->tcon;
253 char buf[24];
254 unsigned int bytes_read;
255 char *pbuf;
256
257 pbuf = buf;
258
259 if (size == 0) {
260 inode->i_mode |= S_IFIFO;
261 return 0;
262 } else if (size < 8) {
263 return -EINVAL; /* EOPNOTSUPP? */
264 }
265
266 rc = CIFSSMBOpen(xid, pTcon, path, FILE_OPEN, GENERIC_READ,
267 CREATE_NOT_DIR, &netfid, &oplock, NULL,
268 cifs_sb->local_nls,
269 cifs_sb->mnt_cifs_flags &
270 CIFS_MOUNT_MAP_SPECIAL_CHR);
271 if (rc == 0) {
272 int buf_type = CIFS_NO_BUFFER;
273 /* Read header */
274 rc = CIFSSMBRead(xid, pTcon,
275 netfid,
276 24 /* length */, 0 /* offset */,
277 &bytes_read, &pbuf, &buf_type);
278 if ((rc == 0) && (bytes_read >= 8)) {
279 if (memcmp("IntxBLK", pbuf, 8) == 0) {
280 cFYI(1, ("Block device"));
281 inode->i_mode |= S_IFBLK;
282 if (bytes_read == 24) {
283 /* we have enough to decode dev num */
284 __u64 mjr; /* major */
285 __u64 mnr; /* minor */
286 mjr = le64_to_cpu(*(__le64 *)(pbuf+8));
287 mnr = le64_to_cpu(*(__le64 *)(pbuf+16));
288 inode->i_rdev = MKDEV(mjr, mnr);
289 }
290 } else if (memcmp("IntxCHR", pbuf, 8) == 0) {
291 cFYI(1, ("Char device"));
292 inode->i_mode |= S_IFCHR;
293 if (bytes_read == 24) {
294 /* we have enough to decode dev num */
295 __u64 mjr; /* major */
296 __u64 mnr; /* minor */
297 mjr = le64_to_cpu(*(__le64 *)(pbuf+8));
298 mnr = le64_to_cpu(*(__le64 *)(pbuf+16));
299 inode->i_rdev = MKDEV(mjr, mnr);
300 }
301 } else if (memcmp("IntxLNK", pbuf, 7) == 0) {
302 cFYI(1, ("Symlink"));
303 inode->i_mode |= S_IFLNK;
304 } else {
305 inode->i_mode |= S_IFREG; /* file? */
306 rc = -EOPNOTSUPP;
307 }
308 } else {
309 inode->i_mode |= S_IFREG; /* then it is a file */
310 rc = -EOPNOTSUPP; /* or some unknown SFU type */
311 }
312 CIFSSMBClose(xid, pTcon, netfid);
313 }
314 return rc;
315 }
316
317 #define SFBITS_MASK (S_ISVTX | S_ISGID | S_ISUID) /* SETFILEBITS valid bits */
318
319 static int get_sfu_mode(struct inode *inode,
320 const unsigned char *path,
321 struct cifs_sb_info *cifs_sb, int xid)
322 {
323 #ifdef CONFIG_CIFS_XATTR
324 ssize_t rc;
325 char ea_value[4];
326 __u32 mode;
327
328 rc = CIFSSMBQueryEA(xid, cifs_sb->tcon, path, "SETFILEBITS",
329 ea_value, 4 /* size of buf */, cifs_sb->local_nls,
330 cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR);
331 if (rc < 0)
332 return (int)rc;
333 else if (rc > 3) {
334 mode = le32_to_cpu(*((__le32 *)ea_value));
335 inode->i_mode &= ~SFBITS_MASK;
336 cFYI(1, ("special bits 0%o org mode 0%o", mode, inode->i_mode));
337 inode->i_mode = (mode & SFBITS_MASK) | inode->i_mode;
338 cFYI(1, ("special mode bits 0%o", mode));
339 return 0;
340 } else {
341 return 0;
342 }
343 #else
344 return -EOPNOTSUPP;
345 #endif
346 }
347
348 int cifs_get_inode_info(struct inode **pinode,
349 const unsigned char *search_path, FILE_ALL_INFO *pfindData,
350 struct super_block *sb, int xid)
351 {
352 int rc = 0;
353 struct cifsTconInfo *pTcon;
354 struct inode *inode;
355 struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
356 char *tmp_path;
357 char *buf = NULL;
358 int adjustTZ = FALSE;
359
360 pTcon = cifs_sb->tcon;
361 cFYI(1, ("Getting info on %s", search_path));
362
363 if ((pfindData == NULL) && (*pinode != NULL)) {
364 if (CIFS_I(*pinode)->clientCanCacheRead) {
365 cFYI(1, ("No need to revalidate cached inode sizes"));
366 return rc;
367 }
368 }
369
370 /* if file info not passed in then get it from server */
371 if (pfindData == NULL) {
372 buf = kmalloc(sizeof(FILE_ALL_INFO), GFP_KERNEL);
373 if (buf == NULL)
374 return -ENOMEM;
375 pfindData = (FILE_ALL_INFO *)buf;
376 /* could do find first instead but this returns more info */
377 rc = CIFSSMBQPathInfo(xid, pTcon, search_path, pfindData,
378 0 /* not legacy */,
379 cifs_sb->local_nls, cifs_sb->mnt_cifs_flags &
380 CIFS_MOUNT_MAP_SPECIAL_CHR);
381 /* BB optimize code so we do not make the above call
382 when server claims no NT SMB support and the above call
383 failed at least once - set flag in tcon or mount */
384 if ((rc == -EOPNOTSUPP) || (rc == -EINVAL)) {
385 rc = SMBQueryInformation(xid, pTcon, search_path,
386 pfindData, cifs_sb->local_nls,
387 cifs_sb->mnt_cifs_flags &
388 CIFS_MOUNT_MAP_SPECIAL_CHR);
389 adjustTZ = TRUE;
390 }
391 }
392 /* dump_mem("\nQPathInfo return data",&findData, sizeof(findData)); */
393 if (rc) {
394 if (rc == -EREMOTE) {
395 tmp_path =
396 kmalloc(strnlen
397 (pTcon->treeName,
398 MAX_TREE_SIZE + 1) +
399 strnlen(search_path, MAX_PATHCONF) + 1,
400 GFP_KERNEL);
401 if (tmp_path == NULL) {
402 kfree(buf);
403 return -ENOMEM;
404 }
405
406 strncpy(tmp_path, pTcon->treeName, MAX_TREE_SIZE);
407 strncat(tmp_path, search_path, MAX_PATHCONF);
408 rc = connect_to_dfs_path(xid, pTcon->ses,
409 /* treename + */ tmp_path,
410 cifs_sb->local_nls,
411 cifs_sb->mnt_cifs_flags &
412 CIFS_MOUNT_MAP_SPECIAL_CHR);
413 kfree(tmp_path);
414 /* BB fix up inode etc. */
415 } else if (rc) {
416 kfree(buf);
417 return rc;
418 }
419 } else {
420 struct cifsInodeInfo *cifsInfo;
421 __u32 attr = le32_to_cpu(pfindData->Attributes);
422
423 /* get new inode */
424 if (*pinode == NULL) {
425 *pinode = new_inode(sb);
426 if (*pinode == NULL) {
427 kfree(buf);
428 return -ENOMEM;
429 }
430 /* Is an i_ino of zero legal? Can we use that to check
431 if the server supports returning inode numbers? Are
432 there other sanity checks we can use to ensure that
433 the server is really filling in that field? */
434
435 /* We can not use the IndexNumber field by default from
436 Windows or Samba (in ALL_INFO buf) but we can request
437 it explicitly. It may not be unique presumably if
438 the server has multiple devices mounted under one
439 share */
440
441 /* There may be higher info levels that work but are
442 there Windows server or network appliances for which
443 IndexNumber field is not guaranteed unique? */
444
445 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM) {
446 int rc1 = 0;
447 __u64 inode_num;
448
449 rc1 = CIFSGetSrvInodeNumber(xid, pTcon,
450 search_path, &inode_num,
451 cifs_sb->local_nls,
452 cifs_sb->mnt_cifs_flags &
453 CIFS_MOUNT_MAP_SPECIAL_CHR);
454 if (rc1) {
455 cFYI(1, ("GetSrvInodeNum rc %d", rc1));
456 /* BB EOPNOSUPP disable SERVER_INUM? */
457 } else /* do we need cast or hash to ino? */
458 (*pinode)->i_ino = inode_num;
459 } /* else ino incremented to unique num in new_inode*/
460 if (sb->s_flags & MS_NOATIME)
461 (*pinode)->i_flags |= S_NOATIME | S_NOCMTIME;
462 insert_inode_hash(*pinode);
463 }
464 inode = *pinode;
465 cifsInfo = CIFS_I(inode);
466 cifsInfo->cifsAttrs = attr;
467 cFYI(1, ("Old time %ld", cifsInfo->time));
468 cifsInfo->time = jiffies;
469 cFYI(1, ("New time %ld", cifsInfo->time));
470
471 /* blksize needs to be multiple of two. So safer to default to
472 blksize and blkbits set in superblock so 2**blkbits and blksize
473 will match rather than setting to:
474 (pTcon->ses->server->maxBuf - MAX_CIFS_HDR_SIZE) & 0xFFFFFE00;*/
475
476 /* Linux can not store file creation time so ignore it */
477 if (pfindData->LastAccessTime)
478 inode->i_atime = cifs_NTtimeToUnix
479 (le64_to_cpu(pfindData->LastAccessTime));
480 else /* do not need to use current_fs_time - time not stored */
481 inode->i_atime = CURRENT_TIME;
482 inode->i_mtime =
483 cifs_NTtimeToUnix(le64_to_cpu(pfindData->LastWriteTime));
484 inode->i_ctime =
485 cifs_NTtimeToUnix(le64_to_cpu(pfindData->ChangeTime));
486 cFYI(0, ("Attributes came in as 0x%x", attr));
487 if (adjustTZ && (pTcon->ses) && (pTcon->ses->server)) {
488 inode->i_ctime.tv_sec += pTcon->ses->server->timeAdj;
489 inode->i_mtime.tv_sec += pTcon->ses->server->timeAdj;
490 }
491
492 /* set default mode. will override for dirs below */
493 if (atomic_read(&cifsInfo->inUse) == 0)
494 /* new inode, can safely set these fields */
495 inode->i_mode = cifs_sb->mnt_file_mode;
496 else /* since we set the inode type below we need to mask off
497 to avoid strange results if type changes and both
498 get orred in */
499 inode->i_mode &= ~S_IFMT;
500 /* if (attr & ATTR_REPARSE) */
501 /* We no longer handle these as symlinks because we could not
502 follow them due to the absolute path with drive letter */
503 if (attr & ATTR_DIRECTORY) {
504 /* override default perms since we do not do byte range locking
505 on dirs */
506 inode->i_mode = cifs_sb->mnt_dir_mode;
507 inode->i_mode |= S_IFDIR;
508 } else if ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_UNX_EMUL) &&
509 (cifsInfo->cifsAttrs & ATTR_SYSTEM) &&
510 /* No need to le64 convert size of zero */
511 (pfindData->EndOfFile == 0)) {
512 inode->i_mode = cifs_sb->mnt_file_mode;
513 inode->i_mode |= S_IFIFO;
514 /* BB Finish for SFU style symlinks and devices */
515 } else if ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_UNX_EMUL) &&
516 (cifsInfo->cifsAttrs & ATTR_SYSTEM)) {
517 if (decode_sfu_inode(inode,
518 le64_to_cpu(pfindData->EndOfFile),
519 search_path,
520 cifs_sb, xid))
521 cFYI(1, ("Unrecognized sfu inode type"));
522
523 cFYI(1, ("sfu mode 0%o", inode->i_mode));
524 } else {
525 inode->i_mode |= S_IFREG;
526 /* treat the dos attribute of read-only as read-only
527 mode e.g. 555 */
528 if (cifsInfo->cifsAttrs & ATTR_READONLY)
529 inode->i_mode &= ~(S_IWUGO);
530 else if ((inode->i_mode & S_IWUGO) == 0)
531 /* the ATTR_READONLY flag may have been */
532 /* changed on server -- set any w bits */
533 /* allowed by mnt_file_mode */
534 inode->i_mode |= (S_IWUGO &
535 cifs_sb->mnt_file_mode);
536 /* BB add code here -
537 validate if device or weird share or device type? */
538 }
539
540 spin_lock(&inode->i_lock);
541 if (is_size_safe_to_change(cifsInfo,
542 le64_to_cpu(pfindData->EndOfFile))) {
543 /* can not safely shrink the file size here if the
544 client is writing to it due to potential races */
545 i_size_write(inode, le64_to_cpu(pfindData->EndOfFile));
546
547 /* 512 bytes (2**9) is the fake blocksize that must be
548 used for this calculation */
549 inode->i_blocks = (512 - 1 + le64_to_cpu(
550 pfindData->AllocationSize)) >> 9;
551 }
552 spin_unlock(&inode->i_lock);
553
554 inode->i_nlink = le32_to_cpu(pfindData->NumberOfLinks);
555
556 /* BB fill in uid and gid here? with help from winbind?
557 or retrieve from NTFS stream extended attribute */
558 #ifdef CONFIG_CIFS_EXPERIMENTAL
559 /* fill in 0777 bits from ACL */
560 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_CIFS_ACL) {
561 cFYI(1, ("Getting mode bits from ACL"));
562 acl_to_uid_mode(inode, search_path);
563 }
564 #endif
565 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_UNX_EMUL) {
566 /* fill in remaining high mode bits e.g. SUID, VTX */
567 get_sfu_mode(inode, search_path, cifs_sb, xid);
568 } else if (atomic_read(&cifsInfo->inUse) == 0) {
569 inode->i_uid = cifs_sb->mnt_uid;
570 inode->i_gid = cifs_sb->mnt_gid;
571 /* set so we do not keep refreshing these fields with
572 bad data after user has changed them in memory */
573 atomic_set(&cifsInfo->inUse, 1);
574 }
575
576 cifs_set_ops(inode);
577 }
578 kfree(buf);
579 return rc;
580 }
581
582 static const struct inode_operations cifs_ipc_inode_ops = {
583 .lookup = cifs_lookup,
584 };
585
586 /* gets root inode */
587 struct inode *cifs_iget(struct super_block *sb, unsigned long ino)
588 {
589 int xid;
590 struct cifs_sb_info *cifs_sb;
591 struct inode *inode;
592 long rc;
593
594 inode = iget_locked(sb, ino);
595 if (!inode)
596 return ERR_PTR(-ENOMEM);
597 if (!(inode->i_state & I_NEW))
598 return inode;
599
600 cifs_sb = CIFS_SB(inode->i_sb);
601 xid = GetXid();
602
603 if (cifs_sb->tcon->unix_ext)
604 rc = cifs_get_inode_info_unix(&inode, "", inode->i_sb, xid);
605 else
606 rc = cifs_get_inode_info(&inode, "", NULL, inode->i_sb, xid);
607 if (rc && cifs_sb->tcon->ipc) {
608 cFYI(1, ("ipc connection - fake read inode"));
609 inode->i_mode |= S_IFDIR;
610 inode->i_nlink = 2;
611 inode->i_op = &cifs_ipc_inode_ops;
612 inode->i_fop = &simple_dir_operations;
613 inode->i_uid = cifs_sb->mnt_uid;
614 inode->i_gid = cifs_sb->mnt_gid;
615 _FreeXid(xid);
616 iget_failed(inode);
617 return ERR_PTR(rc);
618 }
619
620 unlock_new_inode(inode);
621
622 /* can not call macro FreeXid here since in a void func
623 * TODO: This is no longer true
624 */
625 _FreeXid(xid);
626 return inode;
627 }
628
629 int cifs_unlink(struct inode *inode, struct dentry *direntry)
630 {
631 int rc = 0;
632 int xid;
633 struct cifs_sb_info *cifs_sb;
634 struct cifsTconInfo *pTcon;
635 char *full_path = NULL;
636 struct cifsInodeInfo *cifsInode;
637 FILE_BASIC_INFO *pinfo_buf;
638
639 cFYI(1, ("cifs_unlink, inode = 0x%p", inode));
640
641 xid = GetXid();
642
643 if (inode)
644 cifs_sb = CIFS_SB(inode->i_sb);
645 else
646 cifs_sb = CIFS_SB(direntry->d_sb);
647 pTcon = cifs_sb->tcon;
648
649 /* Unlink can be called from rename so we can not grab the sem here
650 since we deadlock otherwise */
651 /* mutex_lock(&direntry->d_sb->s_vfs_rename_mutex);*/
652 full_path = build_path_from_dentry(direntry);
653 /* mutex_unlock(&direntry->d_sb->s_vfs_rename_mutex);*/
654 if (full_path == NULL) {
655 FreeXid(xid);
656 return -ENOMEM;
657 }
658
659 if ((pTcon->ses->capabilities & CAP_UNIX) &&
660 (CIFS_UNIX_POSIX_PATH_OPS_CAP &
661 le64_to_cpu(pTcon->fsUnixInfo.Capability))) {
662 rc = CIFSPOSIXDelFile(xid, pTcon, full_path,
663 SMB_POSIX_UNLINK_FILE_TARGET, cifs_sb->local_nls,
664 cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR);
665 cFYI(1, ("posix del rc %d", rc));
666 if ((rc == 0) || (rc == -ENOENT))
667 goto psx_del_no_retry;
668 }
669
670 rc = CIFSSMBDelFile(xid, pTcon, full_path, cifs_sb->local_nls,
671 cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR);
672 psx_del_no_retry:
673 if (!rc) {
674 if (direntry->d_inode)
675 drop_nlink(direntry->d_inode);
676 } else if (rc == -ENOENT) {
677 d_drop(direntry);
678 } else if (rc == -ETXTBSY) {
679 int oplock = FALSE;
680 __u16 netfid;
681
682 rc = CIFSSMBOpen(xid, pTcon, full_path, FILE_OPEN, DELETE,
683 CREATE_NOT_DIR | CREATE_DELETE_ON_CLOSE,
684 &netfid, &oplock, NULL, cifs_sb->local_nls,
685 cifs_sb->mnt_cifs_flags &
686 CIFS_MOUNT_MAP_SPECIAL_CHR);
687 if (rc == 0) {
688 CIFSSMBRenameOpenFile(xid, pTcon, netfid, NULL,
689 cifs_sb->local_nls,
690 cifs_sb->mnt_cifs_flags &
691 CIFS_MOUNT_MAP_SPECIAL_CHR);
692 CIFSSMBClose(xid, pTcon, netfid);
693 if (direntry->d_inode)
694 drop_nlink(direntry->d_inode);
695 }
696 } else if (rc == -EACCES) {
697 /* try only if r/o attribute set in local lookup data? */
698 pinfo_buf = kzalloc(sizeof(FILE_BASIC_INFO), GFP_KERNEL);
699 if (pinfo_buf) {
700 /* ATTRS set to normal clears r/o bit */
701 pinfo_buf->Attributes = cpu_to_le32(ATTR_NORMAL);
702 if (!(pTcon->ses->flags & CIFS_SES_NT4))
703 rc = CIFSSMBSetTimes(xid, pTcon, full_path,
704 pinfo_buf,
705 cifs_sb->local_nls,
706 cifs_sb->mnt_cifs_flags &
707 CIFS_MOUNT_MAP_SPECIAL_CHR);
708 else
709 rc = -EOPNOTSUPP;
710
711 if (rc == -EOPNOTSUPP) {
712 int oplock = FALSE;
713 __u16 netfid;
714 /* rc = CIFSSMBSetAttrLegacy(xid, pTcon,
715 full_path,
716 (__u16)ATTR_NORMAL,
717 cifs_sb->local_nls);
718 For some strange reason it seems that NT4 eats the
719 old setattr call without actually setting the
720 attributes so on to the third attempted workaround
721 */
722
723 /* BB could scan to see if we already have it open
724 and pass in pid of opener to function */
725 rc = CIFSSMBOpen(xid, pTcon, full_path,
726 FILE_OPEN, SYNCHRONIZE |
727 FILE_WRITE_ATTRIBUTES, 0,
728 &netfid, &oplock, NULL,
729 cifs_sb->local_nls,
730 cifs_sb->mnt_cifs_flags &
731 CIFS_MOUNT_MAP_SPECIAL_CHR);
732 if (rc == 0) {
733 rc = CIFSSMBSetFileTimes(xid, pTcon,
734 pinfo_buf,
735 netfid);
736 CIFSSMBClose(xid, pTcon, netfid);
737 }
738 }
739 kfree(pinfo_buf);
740 }
741 if (rc == 0) {
742 rc = CIFSSMBDelFile(xid, pTcon, full_path,
743 cifs_sb->local_nls,
744 cifs_sb->mnt_cifs_flags &
745 CIFS_MOUNT_MAP_SPECIAL_CHR);
746 if (!rc) {
747 if (direntry->d_inode)
748 drop_nlink(direntry->d_inode);
749 } else if (rc == -ETXTBSY) {
750 int oplock = FALSE;
751 __u16 netfid;
752
753 rc = CIFSSMBOpen(xid, pTcon, full_path,
754 FILE_OPEN, DELETE,
755 CREATE_NOT_DIR |
756 CREATE_DELETE_ON_CLOSE,
757 &netfid, &oplock, NULL,
758 cifs_sb->local_nls,
759 cifs_sb->mnt_cifs_flags &
760 CIFS_MOUNT_MAP_SPECIAL_CHR);
761 if (rc == 0) {
762 CIFSSMBRenameOpenFile(xid, pTcon,
763 netfid, NULL,
764 cifs_sb->local_nls,
765 cifs_sb->mnt_cifs_flags &
766 CIFS_MOUNT_MAP_SPECIAL_CHR);
767 CIFSSMBClose(xid, pTcon, netfid);
768 if (direntry->d_inode)
769 drop_nlink(direntry->d_inode);
770 }
771 /* BB if rc = -ETXTBUSY goto the rename logic BB */
772 }
773 }
774 }
775 if (direntry->d_inode) {
776 cifsInode = CIFS_I(direntry->d_inode);
777 cifsInode->time = 0; /* will force revalidate to get info
778 when needed */
779 direntry->d_inode->i_ctime = current_fs_time(inode->i_sb);
780 }
781 if (inode) {
782 inode->i_ctime = inode->i_mtime = current_fs_time(inode->i_sb);
783 cifsInode = CIFS_I(inode);
784 cifsInode->time = 0; /* force revalidate of dir as well */
785 }
786
787 kfree(full_path);
788 FreeXid(xid);
789 return rc;
790 }
791
792 static void posix_fill_in_inode(struct inode *tmp_inode,
793 FILE_UNIX_BASIC_INFO *pData, int isNewInode)
794 {
795 struct cifsInodeInfo *cifsInfo = CIFS_I(tmp_inode);
796 loff_t local_size;
797 struct timespec local_mtime;
798
799 cifsInfo->time = jiffies;
800 atomic_inc(&cifsInfo->inUse);
801
802 /* save mtime and size */
803 local_mtime = tmp_inode->i_mtime;
804 local_size = tmp_inode->i_size;
805
806 cifs_unix_info_to_inode(tmp_inode, pData, 1);
807 cifs_set_ops(tmp_inode);
808
809 if (!S_ISREG(tmp_inode->i_mode))
810 return;
811
812 /*
813 * No sense invalidating pages for new inode
814 * since we we have not started caching
815 * readahead file data yet.
816 */
817 if (isNewInode)
818 return;
819
820 if (timespec_equal(&tmp_inode->i_mtime, &local_mtime) &&
821 (local_size == tmp_inode->i_size)) {
822 cFYI(1, ("inode exists but unchanged"));
823 } else {
824 /* file may have changed on server */
825 cFYI(1, ("invalidate inode, readdir detected change"));
826 invalidate_remote_inode(tmp_inode);
827 }
828 }
829
830 int cifs_mkdir(struct inode *inode, struct dentry *direntry, int mode)
831 {
832 int rc = 0;
833 int xid;
834 struct cifs_sb_info *cifs_sb;
835 struct cifsTconInfo *pTcon;
836 char *full_path = NULL;
837 struct inode *newinode = NULL;
838
839 cFYI(1, ("In cifs_mkdir, mode = 0x%x inode = 0x%p", mode, inode));
840
841 xid = GetXid();
842
843 cifs_sb = CIFS_SB(inode->i_sb);
844 pTcon = cifs_sb->tcon;
845
846 full_path = build_path_from_dentry(direntry);
847 if (full_path == NULL) {
848 FreeXid(xid);
849 return -ENOMEM;
850 }
851
852 if ((pTcon->ses->capabilities & CAP_UNIX) &&
853 (CIFS_UNIX_POSIX_PATH_OPS_CAP &
854 le64_to_cpu(pTcon->fsUnixInfo.Capability))) {
855 u32 oplock = 0;
856 FILE_UNIX_BASIC_INFO *pInfo =
857 kzalloc(sizeof(FILE_UNIX_BASIC_INFO), GFP_KERNEL);
858 if (pInfo == NULL) {
859 rc = -ENOMEM;
860 goto mkdir_out;
861 }
862
863 mode &= ~current->fs->umask;
864 rc = CIFSPOSIXCreate(xid, pTcon, SMB_O_DIRECTORY | SMB_O_CREAT,
865 mode, NULL /* netfid */, pInfo, &oplock,
866 full_path, cifs_sb->local_nls,
867 cifs_sb->mnt_cifs_flags &
868 CIFS_MOUNT_MAP_SPECIAL_CHR);
869 if (rc == -EOPNOTSUPP) {
870 kfree(pInfo);
871 goto mkdir_retry_old;
872 } else if (rc) {
873 cFYI(1, ("posix mkdir returned 0x%x", rc));
874 d_drop(direntry);
875 } else {
876 if (pInfo->Type == cpu_to_le32(-1)) {
877 /* no return info, go query for it */
878 kfree(pInfo);
879 goto mkdir_get_info;
880 }
881 /*BB check (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SET_UID ) to see if need
882 to set uid/gid */
883 inc_nlink(inode);
884 if (pTcon->nocase)
885 direntry->d_op = &cifs_ci_dentry_ops;
886 else
887 direntry->d_op = &cifs_dentry_ops;
888
889 newinode = new_inode(inode->i_sb);
890 if (newinode == NULL) {
891 kfree(pInfo);
892 goto mkdir_get_info;
893 }
894 /* Is an i_ino of zero legal? */
895 /* Are there sanity checks we can use to ensure that
896 the server is really filling in that field? */
897 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM) {
898 newinode->i_ino =
899 (unsigned long)pInfo->UniqueId;
900 } /* note ino incremented to unique num in new_inode */
901 if (inode->i_sb->s_flags & MS_NOATIME)
902 newinode->i_flags |= S_NOATIME | S_NOCMTIME;
903 newinode->i_nlink = 2;
904
905 insert_inode_hash(newinode);
906 d_instantiate(direntry, newinode);
907
908 /* we already checked in POSIXCreate whether
909 frame was long enough */
910 posix_fill_in_inode(direntry->d_inode,
911 pInfo, 1 /* NewInode */);
912 #ifdef CONFIG_CIFS_DEBUG2
913 cFYI(1, ("instantiated dentry %p %s to inode %p",
914 direntry, direntry->d_name.name, newinode));
915
916 if (newinode->i_nlink != 2)
917 cFYI(1, ("unexpected number of links %d",
918 newinode->i_nlink));
919 #endif
920 }
921 kfree(pInfo);
922 goto mkdir_out;
923 }
924 mkdir_retry_old:
925 /* BB add setting the equivalent of mode via CreateX w/ACLs */
926 rc = CIFSSMBMkDir(xid, pTcon, full_path, cifs_sb->local_nls,
927 cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR);
928 if (rc) {
929 cFYI(1, ("cifs_mkdir returned 0x%x", rc));
930 d_drop(direntry);
931 } else {
932 mkdir_get_info:
933 inc_nlink(inode);
934 if (pTcon->unix_ext)
935 rc = cifs_get_inode_info_unix(&newinode, full_path,
936 inode->i_sb, xid);
937 else
938 rc = cifs_get_inode_info(&newinode, full_path, NULL,
939 inode->i_sb, xid);
940
941 if (pTcon->nocase)
942 direntry->d_op = &cifs_ci_dentry_ops;
943 else
944 direntry->d_op = &cifs_dentry_ops;
945 d_instantiate(direntry, newinode);
946 /* setting nlink not necessary except in cases where we
947 * failed to get it from the server or was set bogus */
948 if ((direntry->d_inode) && (direntry->d_inode->i_nlink < 2))
949 direntry->d_inode->i_nlink = 2;
950 if (pTcon->unix_ext) {
951 mode &= ~current->fs->umask;
952 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SET_UID) {
953 CIFSSMBUnixSetPerms(xid, pTcon, full_path,
954 mode,
955 (__u64)current->fsuid,
956 (__u64)current->fsgid,
957 0 /* dev_t */,
958 cifs_sb->local_nls,
959 cifs_sb->mnt_cifs_flags &
960 CIFS_MOUNT_MAP_SPECIAL_CHR);
961 } else {
962 CIFSSMBUnixSetPerms(xid, pTcon, full_path,
963 mode, (__u64)-1,
964 (__u64)-1, 0 /* dev_t */,
965 cifs_sb->local_nls,
966 cifs_sb->mnt_cifs_flags &
967 CIFS_MOUNT_MAP_SPECIAL_CHR);
968 }
969 } else {
970 /* BB to be implemented via Windows secrty descriptors
971 eg CIFSSMBWinSetPerms(xid, pTcon, full_path, mode,
972 -1, -1, local_nls); */
973 if (direntry->d_inode) {
974 direntry->d_inode->i_mode = mode;
975 direntry->d_inode->i_mode |= S_IFDIR;
976 if (cifs_sb->mnt_cifs_flags &
977 CIFS_MOUNT_SET_UID) {
978 direntry->d_inode->i_uid =
979 current->fsuid;
980 direntry->d_inode->i_gid =
981 current->fsgid;
982 }
983 }
984 }
985 }
986 mkdir_out:
987 kfree(full_path);
988 FreeXid(xid);
989 return rc;
990 }
991
992 int cifs_rmdir(struct inode *inode, struct dentry *direntry)
993 {
994 int rc = 0;
995 int xid;
996 struct cifs_sb_info *cifs_sb;
997 struct cifsTconInfo *pTcon;
998 char *full_path = NULL;
999 struct cifsInodeInfo *cifsInode;
1000
1001 cFYI(1, ("cifs_rmdir, inode = 0x%p", inode));
1002
1003 xid = GetXid();
1004
1005 cifs_sb = CIFS_SB(inode->i_sb);
1006 pTcon = cifs_sb->tcon;
1007
1008 full_path = build_path_from_dentry(direntry);
1009 if (full_path == NULL) {
1010 FreeXid(xid);
1011 return -ENOMEM;
1012 }
1013
1014 rc = CIFSSMBRmDir(xid, pTcon, full_path, cifs_sb->local_nls,
1015 cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR);
1016
1017 if (!rc) {
1018 drop_nlink(inode);
1019 spin_lock(&direntry->d_inode->i_lock);
1020 i_size_write(direntry->d_inode, 0);
1021 clear_nlink(direntry->d_inode);
1022 spin_unlock(&direntry->d_inode->i_lock);
1023 }
1024
1025 cifsInode = CIFS_I(direntry->d_inode);
1026 cifsInode->time = 0; /* force revalidate to go get info when
1027 needed */
1028 direntry->d_inode->i_ctime = inode->i_ctime = inode->i_mtime =
1029 current_fs_time(inode->i_sb);
1030
1031 kfree(full_path);
1032 FreeXid(xid);
1033 return rc;
1034 }
1035
1036 int cifs_rename(struct inode *source_inode, struct dentry *source_direntry,
1037 struct inode *target_inode, struct dentry *target_direntry)
1038 {
1039 char *fromName;
1040 char *toName;
1041 struct cifs_sb_info *cifs_sb_source;
1042 struct cifs_sb_info *cifs_sb_target;
1043 struct cifsTconInfo *pTcon;
1044 int xid;
1045 int rc = 0;
1046
1047 xid = GetXid();
1048
1049 cifs_sb_target = CIFS_SB(target_inode->i_sb);
1050 cifs_sb_source = CIFS_SB(source_inode->i_sb);
1051 pTcon = cifs_sb_source->tcon;
1052
1053 if (pTcon != cifs_sb_target->tcon) {
1054 FreeXid(xid);
1055 return -EXDEV; /* BB actually could be allowed if same server,
1056 but different share.
1057 Might eventually add support for this */
1058 }
1059
1060 /* we already have the rename sem so we do not need to grab it again
1061 here to protect the path integrity */
1062 fromName = build_path_from_dentry(source_direntry);
1063 toName = build_path_from_dentry(target_direntry);
1064 if ((fromName == NULL) || (toName == NULL)) {
1065 rc = -ENOMEM;
1066 goto cifs_rename_exit;
1067 }
1068
1069 rc = CIFSSMBRename(xid, pTcon, fromName, toName,
1070 cifs_sb_source->local_nls,
1071 cifs_sb_source->mnt_cifs_flags &
1072 CIFS_MOUNT_MAP_SPECIAL_CHR);
1073 if (rc == -EEXIST) {
1074 /* check if they are the same file because rename of hardlinked
1075 files is a noop */
1076 FILE_UNIX_BASIC_INFO *info_buf_source;
1077 FILE_UNIX_BASIC_INFO *info_buf_target;
1078
1079 info_buf_source =
1080 kmalloc(2 * sizeof(FILE_UNIX_BASIC_INFO), GFP_KERNEL);
1081 if (info_buf_source != NULL) {
1082 info_buf_target = info_buf_source + 1;
1083 if (pTcon->unix_ext)
1084 rc = CIFSSMBUnixQPathInfo(xid, pTcon, fromName,
1085 info_buf_source,
1086 cifs_sb_source->local_nls,
1087 cifs_sb_source->mnt_cifs_flags &
1088 CIFS_MOUNT_MAP_SPECIAL_CHR);
1089 /* else rc is still EEXIST so will fall through to
1090 unlink the target and retry rename */
1091 if (rc == 0) {
1092 rc = CIFSSMBUnixQPathInfo(xid, pTcon, toName,
1093 info_buf_target,
1094 cifs_sb_target->local_nls,
1095 /* remap based on source sb */
1096 cifs_sb_source->mnt_cifs_flags &
1097 CIFS_MOUNT_MAP_SPECIAL_CHR);
1098 }
1099 if ((rc == 0) &&
1100 (info_buf_source->UniqueId ==
1101 info_buf_target->UniqueId)) {
1102 /* do not rename since the files are hardlinked which
1103 is a noop */
1104 } else {
1105 /* we either can not tell the files are hardlinked
1106 (as with Windows servers) or files are not
1107 hardlinked so delete the target manually before
1108 renaming to follow POSIX rather than Windows
1109 semantics */
1110 cifs_unlink(target_inode, target_direntry);
1111 rc = CIFSSMBRename(xid, pTcon, fromName,
1112 toName,
1113 cifs_sb_source->local_nls,
1114 cifs_sb_source->mnt_cifs_flags
1115 & CIFS_MOUNT_MAP_SPECIAL_CHR);
1116 }
1117 kfree(info_buf_source);
1118 } /* if we can not get memory just leave rc as EEXIST */
1119 }
1120
1121 if (rc)
1122 cFYI(1, ("rename rc %d", rc));
1123
1124 if ((rc == -EIO) || (rc == -EEXIST)) {
1125 int oplock = FALSE;
1126 __u16 netfid;
1127
1128 /* BB FIXME Is Generic Read correct for rename? */
1129 /* if renaming directory - we should not say CREATE_NOT_DIR,
1130 need to test renaming open directory, also GENERIC_READ
1131 might not right be right access to request */
1132 rc = CIFSSMBOpen(xid, pTcon, fromName, FILE_OPEN, GENERIC_READ,
1133 CREATE_NOT_DIR, &netfid, &oplock, NULL,
1134 cifs_sb_source->local_nls,
1135 cifs_sb_source->mnt_cifs_flags &
1136 CIFS_MOUNT_MAP_SPECIAL_CHR);
1137 if (rc == 0) {
1138 rc = CIFSSMBRenameOpenFile(xid, pTcon, netfid, toName,
1139 cifs_sb_source->local_nls,
1140 cifs_sb_source->mnt_cifs_flags &
1141 CIFS_MOUNT_MAP_SPECIAL_CHR);
1142 CIFSSMBClose(xid, pTcon, netfid);
1143 }
1144 }
1145
1146 cifs_rename_exit:
1147 kfree(fromName);
1148 kfree(toName);
1149 FreeXid(xid);
1150 return rc;
1151 }
1152
1153 int cifs_revalidate(struct dentry *direntry)
1154 {
1155 int xid;
1156 int rc = 0, wbrc = 0;
1157 char *full_path;
1158 struct cifs_sb_info *cifs_sb;
1159 struct cifsInodeInfo *cifsInode;
1160 loff_t local_size;
1161 struct timespec local_mtime;
1162 int invalidate_inode = FALSE;
1163
1164 if (direntry->d_inode == NULL)
1165 return -ENOENT;
1166
1167 cifsInode = CIFS_I(direntry->d_inode);
1168
1169 if (cifsInode == NULL)
1170 return -ENOENT;
1171
1172 /* no sense revalidating inode info on file that no one can write */
1173 if (CIFS_I(direntry->d_inode)->clientCanCacheRead)
1174 return rc;
1175
1176 xid = GetXid();
1177
1178 cifs_sb = CIFS_SB(direntry->d_sb);
1179
1180 /* can not safely grab the rename sem here if rename calls revalidate
1181 since that would deadlock */
1182 full_path = build_path_from_dentry(direntry);
1183 if (full_path == NULL) {
1184 FreeXid(xid);
1185 return -ENOMEM;
1186 }
1187 cFYI(1, ("Revalidate: %s inode 0x%p count %d dentry: 0x%p d_time %ld "
1188 "jiffies %ld", full_path, direntry->d_inode,
1189 direntry->d_inode->i_count.counter, direntry,
1190 direntry->d_time, jiffies));
1191
1192 if (cifsInode->time == 0) {
1193 /* was set to zero previously to force revalidate */
1194 } else if (time_before(jiffies, cifsInode->time + HZ) &&
1195 lookupCacheEnabled) {
1196 if ((S_ISREG(direntry->d_inode->i_mode) == 0) ||
1197 (direntry->d_inode->i_nlink == 1)) {
1198 kfree(full_path);
1199 FreeXid(xid);
1200 return rc;
1201 } else {
1202 cFYI(1, ("Have to revalidate file due to hardlinks"));
1203 }
1204 }
1205
1206 /* save mtime and size */
1207 local_mtime = direntry->d_inode->i_mtime;
1208 local_size = direntry->d_inode->i_size;
1209
1210 if (cifs_sb->tcon->unix_ext) {
1211 rc = cifs_get_inode_info_unix(&direntry->d_inode, full_path,
1212 direntry->d_sb, xid);
1213 if (rc) {
1214 cFYI(1, ("error on getting revalidate info %d", rc));
1215 /* if (rc != -ENOENT)
1216 rc = 0; */ /* BB should we cache info on
1217 certain errors? */
1218 }
1219 } else {
1220 rc = cifs_get_inode_info(&direntry->d_inode, full_path, NULL,
1221 direntry->d_sb, xid);
1222 if (rc) {
1223 cFYI(1, ("error on getting revalidate info %d", rc));
1224 /* if (rc != -ENOENT)
1225 rc = 0; */ /* BB should we cache info on
1226 certain errors? */
1227 }
1228 }
1229 /* should we remap certain errors, access denied?, to zero */
1230
1231 /* if not oplocked, we invalidate inode pages if mtime or file size
1232 had changed on server */
1233
1234 if (timespec_equal(&local_mtime, &direntry->d_inode->i_mtime) &&
1235 (local_size == direntry->d_inode->i_size)) {
1236 cFYI(1, ("cifs_revalidate - inode unchanged"));
1237 } else {
1238 /* file may have changed on server */
1239 if (cifsInode->clientCanCacheRead) {
1240 /* no need to invalidate inode pages since we were the
1241 only ones who could have modified the file and the
1242 server copy is staler than ours */
1243 } else {
1244 invalidate_inode = TRUE;
1245 }
1246 }
1247
1248 /* can not grab this sem since kernel filesys locking documentation
1249 indicates i_mutex may be taken by the kernel on lookup and rename
1250 which could deadlock if we grab the i_mutex here as well */
1251 /* mutex_lock(&direntry->d_inode->i_mutex);*/
1252 /* need to write out dirty pages here */
1253 if (direntry->d_inode->i_mapping) {
1254 /* do we need to lock inode until after invalidate completes
1255 below? */
1256 wbrc = filemap_fdatawrite(direntry->d_inode->i_mapping);
1257 if (wbrc)
1258 CIFS_I(direntry->d_inode)->write_behind_rc = wbrc;
1259 }
1260 if (invalidate_inode) {
1261 /* shrink_dcache not necessary now that cifs dentry ops
1262 are exported for negative dentries */
1263 /* if (S_ISDIR(direntry->d_inode->i_mode))
1264 shrink_dcache_parent(direntry); */
1265 if (S_ISREG(direntry->d_inode->i_mode)) {
1266 if (direntry->d_inode->i_mapping)
1267 wbrc = filemap_fdatawait(direntry->d_inode->i_mapping);
1268 if (wbrc)
1269 CIFS_I(direntry->d_inode)->write_behind_rc = wbrc;
1270 /* may eventually have to do this for open files too */
1271 if (list_empty(&(cifsInode->openFileList))) {
1272 /* changed on server - flush read ahead pages */
1273 cFYI(1, ("Invalidating read ahead data on "
1274 "closed file"));
1275 invalidate_remote_inode(direntry->d_inode);
1276 }
1277 }
1278 }
1279 /* mutex_unlock(&direntry->d_inode->i_mutex); */
1280
1281 kfree(full_path);
1282 FreeXid(xid);
1283 return rc;
1284 }
1285
1286 int cifs_getattr(struct vfsmount *mnt, struct dentry *dentry,
1287 struct kstat *stat)
1288 {
1289 int err = cifs_revalidate(dentry);
1290 if (!err) {
1291 generic_fillattr(dentry->d_inode, stat);
1292 stat->blksize = CIFS_MAX_MSGSIZE;
1293 }
1294 return err;
1295 }
1296
1297 static int cifs_truncate_page(struct address_space *mapping, loff_t from)
1298 {
1299 pgoff_t index = from >> PAGE_CACHE_SHIFT;
1300 unsigned offset = from & (PAGE_CACHE_SIZE - 1);
1301 struct page *page;
1302 int rc = 0;
1303
1304 page = grab_cache_page(mapping, index);
1305 if (!page)
1306 return -ENOMEM;
1307
1308 zero_user_segment(page, offset, PAGE_CACHE_SIZE);
1309 unlock_page(page);
1310 page_cache_release(page);
1311 return rc;
1312 }
1313
1314 static int cifs_vmtruncate(struct inode *inode, loff_t offset)
1315 {
1316 struct address_space *mapping = inode->i_mapping;
1317 unsigned long limit;
1318
1319 spin_lock(&inode->i_lock);
1320 if (inode->i_size < offset)
1321 goto do_expand;
1322 /*
1323 * truncation of in-use swapfiles is disallowed - it would cause
1324 * subsequent swapout to scribble on the now-freed blocks.
1325 */
1326 if (IS_SWAPFILE(inode)) {
1327 spin_unlock(&inode->i_lock);
1328 goto out_busy;
1329 }
1330 i_size_write(inode, offset);
1331 spin_unlock(&inode->i_lock);
1332 /*
1333 * unmap_mapping_range is called twice, first simply for efficiency
1334 * so that truncate_inode_pages does fewer single-page unmaps. However
1335 * after this first call, and before truncate_inode_pages finishes,
1336 * it is possible for private pages to be COWed, which remain after
1337 * truncate_inode_pages finishes, hence the second unmap_mapping_range
1338 * call must be made for correctness.
1339 */
1340 unmap_mapping_range(mapping, offset + PAGE_SIZE - 1, 0, 1);
1341 truncate_inode_pages(mapping, offset);
1342 unmap_mapping_range(mapping, offset + PAGE_SIZE - 1, 0, 1);
1343 goto out_truncate;
1344
1345 do_expand:
1346 limit = current->signal->rlim[RLIMIT_FSIZE].rlim_cur;
1347 if (limit != RLIM_INFINITY && offset > limit) {
1348 spin_unlock(&inode->i_lock);
1349 goto out_sig;
1350 }
1351 if (offset > inode->i_sb->s_maxbytes) {
1352 spin_unlock(&inode->i_lock);
1353 goto out_big;
1354 }
1355 i_size_write(inode, offset);
1356 spin_unlock(&inode->i_lock);
1357 out_truncate:
1358 if (inode->i_op && inode->i_op->truncate)
1359 inode->i_op->truncate(inode);
1360 return 0;
1361 out_sig:
1362 send_sig(SIGXFSZ, current, 0);
1363 out_big:
1364 return -EFBIG;
1365 out_busy:
1366 return -ETXTBSY;
1367 }
1368
1369 int cifs_setattr(struct dentry *direntry, struct iattr *attrs)
1370 {
1371 int xid;
1372 struct cifs_sb_info *cifs_sb;
1373 struct cifsTconInfo *pTcon;
1374 char *full_path = NULL;
1375 int rc = -EACCES;
1376 struct cifsFileInfo *open_file = NULL;
1377 FILE_BASIC_INFO time_buf;
1378 int set_time = FALSE;
1379 int set_dosattr = FALSE;
1380 __u64 mode = 0xFFFFFFFFFFFFFFFFULL;
1381 __u64 uid = 0xFFFFFFFFFFFFFFFFULL;
1382 __u64 gid = 0xFFFFFFFFFFFFFFFFULL;
1383 struct cifsInodeInfo *cifsInode;
1384
1385 xid = GetXid();
1386
1387 cFYI(1, ("setattr on file %s attrs->iavalid 0x%x",
1388 direntry->d_name.name, attrs->ia_valid));
1389
1390 cifs_sb = CIFS_SB(direntry->d_inode->i_sb);
1391 pTcon = cifs_sb->tcon;
1392
1393 if ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_PERM) == 0) {
1394 /* check if we have permission to change attrs */
1395 rc = inode_change_ok(direntry->d_inode, attrs);
1396 if (rc < 0) {
1397 FreeXid(xid);
1398 return rc;
1399 } else
1400 rc = 0;
1401 }
1402
1403 full_path = build_path_from_dentry(direntry);
1404 if (full_path == NULL) {
1405 FreeXid(xid);
1406 return -ENOMEM;
1407 }
1408 cifsInode = CIFS_I(direntry->d_inode);
1409
1410 /* BB check if we need to refresh inode from server now ? BB */
1411
1412 if (attrs->ia_valid & ATTR_SIZE) {
1413 /*
1414 Flush data before changing file size on server. If the
1415 flush returns error, store it to report later and continue.
1416 BB: This should be smarter. Why bother flushing pages that
1417 will be truncated anyway? Also, should we error out here if
1418 the flush returns error?
1419 */
1420 rc = filemap_write_and_wait(direntry->d_inode->i_mapping);
1421 if (rc != 0) {
1422 CIFS_I(direntry->d_inode)->write_behind_rc = rc;
1423 rc = 0;
1424 }
1425
1426 /* To avoid spurious oplock breaks from server, in the case of
1427 inodes that we already have open, avoid doing path based
1428 setting of file size if we can do it by handle.
1429 This keeps our caching token (oplock) and avoids timeouts
1430 when the local oplock break takes longer to flush
1431 writebehind data than the SMB timeout for the SetPathInfo
1432 request would allow */
1433
1434 open_file = find_writable_file(cifsInode);
1435 if (open_file) {
1436 __u16 nfid = open_file->netfid;
1437 __u32 npid = open_file->pid;
1438 rc = CIFSSMBSetFileSize(xid, pTcon, attrs->ia_size,
1439 nfid, npid, FALSE);
1440 atomic_dec(&open_file->wrtPending);
1441 cFYI(1, ("SetFSize for attrs rc = %d", rc));
1442 if ((rc == -EINVAL) || (rc == -EOPNOTSUPP)) {
1443 unsigned int bytes_written;
1444 rc = CIFSSMBWrite(xid, pTcon,
1445 nfid, 0, attrs->ia_size,
1446 &bytes_written, NULL, NULL,
1447 1 /* 45 seconds */);
1448 cFYI(1, ("Wrt seteof rc %d", rc));
1449 }
1450 } else
1451 rc = -EINVAL;
1452
1453 if (rc != 0) {
1454 /* Set file size by pathname rather than by handle
1455 either because no valid, writeable file handle for
1456 it was found or because there was an error setting
1457 it by handle */
1458 rc = CIFSSMBSetEOF(xid, pTcon, full_path,
1459 attrs->ia_size, FALSE,
1460 cifs_sb->local_nls,
1461 cifs_sb->mnt_cifs_flags &
1462 CIFS_MOUNT_MAP_SPECIAL_CHR);
1463 cFYI(1, ("SetEOF by path (setattrs) rc = %d", rc));
1464 if ((rc == -EINVAL) || (rc == -EOPNOTSUPP)) {
1465 __u16 netfid;
1466 int oplock = FALSE;
1467
1468 rc = SMBLegacyOpen(xid, pTcon, full_path,
1469 FILE_OPEN,
1470 SYNCHRONIZE | FILE_WRITE_ATTRIBUTES,
1471 CREATE_NOT_DIR, &netfid, &oplock,
1472 NULL, cifs_sb->local_nls,
1473 cifs_sb->mnt_cifs_flags &
1474 CIFS_MOUNT_MAP_SPECIAL_CHR);
1475 if (rc == 0) {
1476 unsigned int bytes_written;
1477 rc = CIFSSMBWrite(xid, pTcon,
1478 netfid, 0,
1479 attrs->ia_size,
1480 &bytes_written, NULL,
1481 NULL, 1 /* 45 sec */);
1482 cFYI(1, ("wrt seteof rc %d", rc));
1483 CIFSSMBClose(xid, pTcon, netfid);
1484 }
1485
1486 }
1487 }
1488
1489 /* Server is ok setting allocation size implicitly - no need
1490 to call:
1491 CIFSSMBSetEOF(xid, pTcon, full_path, attrs->ia_size, TRUE,
1492 cifs_sb->local_nls);
1493 */
1494
1495 if (rc == 0) {
1496 rc = cifs_vmtruncate(direntry->d_inode, attrs->ia_size);
1497 cifs_truncate_page(direntry->d_inode->i_mapping,
1498 direntry->d_inode->i_size);
1499 } else
1500 goto cifs_setattr_exit;
1501 }
1502 if (attrs->ia_valid & ATTR_UID) {
1503 cFYI(1, ("UID changed to %d", attrs->ia_uid));
1504 uid = attrs->ia_uid;
1505 }
1506 if (attrs->ia_valid & ATTR_GID) {
1507 cFYI(1, ("GID changed to %d", attrs->ia_gid));
1508 gid = attrs->ia_gid;
1509 }
1510
1511 time_buf.Attributes = 0;
1512
1513 /* skip mode change if it's just for clearing setuid/setgid */
1514 if (attrs->ia_valid & (ATTR_KILL_SUID|ATTR_KILL_SGID))
1515 attrs->ia_valid &= ~ATTR_MODE;
1516
1517 if (attrs->ia_valid & ATTR_MODE) {
1518 cFYI(1, ("Mode changed to 0x%x", attrs->ia_mode));
1519 mode = attrs->ia_mode;
1520 }
1521
1522 if ((pTcon->unix_ext)
1523 && (attrs->ia_valid & (ATTR_MODE | ATTR_GID | ATTR_UID)))
1524 rc = CIFSSMBUnixSetPerms(xid, pTcon, full_path, mode, uid, gid,
1525 0 /* dev_t */, cifs_sb->local_nls,
1526 cifs_sb->mnt_cifs_flags &
1527 CIFS_MOUNT_MAP_SPECIAL_CHR);
1528 else if (attrs->ia_valid & ATTR_MODE) {
1529 rc = 0;
1530 #ifdef CONFIG_CIFS_EXPERIMENTAL
1531 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_CIFS_ACL)
1532 rc = mode_to_acl(direntry->d_inode, full_path, mode);
1533 else if ((mode & S_IWUGO) == 0) {
1534 #else
1535 if ((mode & S_IWUGO) == 0) {
1536 #endif
1537 /* not writeable */
1538 if ((cifsInode->cifsAttrs & ATTR_READONLY) == 0) {
1539 set_dosattr = TRUE;
1540 time_buf.Attributes =
1541 cpu_to_le32(cifsInode->cifsAttrs |
1542 ATTR_READONLY);
1543 }
1544 } else if (cifsInode->cifsAttrs & ATTR_READONLY) {
1545 /* If file is readonly on server, we would
1546 not be able to write to it - so if any write
1547 bit is enabled for user or group or other we
1548 need to at least try to remove r/o dos attr */
1549 set_dosattr = TRUE;
1550 time_buf.Attributes = cpu_to_le32(cifsInode->cifsAttrs &
1551 (~ATTR_READONLY));
1552 /* Windows ignores set to zero */
1553 if (time_buf.Attributes == 0)
1554 time_buf.Attributes |= cpu_to_le32(ATTR_NORMAL);
1555 }
1556 #ifdef CONFIG_CIFS_EXPERIMENTAL
1557 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_CIFS_ACL)
1558 mode_to_acl(direntry->d_inode, full_path, mode);
1559 #endif
1560 }
1561
1562 if (attrs->ia_valid & ATTR_ATIME) {
1563 set_time = TRUE;
1564 time_buf.LastAccessTime =
1565 cpu_to_le64(cifs_UnixTimeToNT(attrs->ia_atime));
1566 } else
1567 time_buf.LastAccessTime = 0;
1568
1569 if (attrs->ia_valid & ATTR_MTIME) {
1570 set_time = TRUE;
1571 time_buf.LastWriteTime =
1572 cpu_to_le64(cifs_UnixTimeToNT(attrs->ia_mtime));
1573 } else
1574 time_buf.LastWriteTime = 0;
1575 /* Do not set ctime explicitly unless other time
1576 stamps are changed explicitly (i.e. by utime()
1577 since we would then have a mix of client and
1578 server times */
1579
1580 if (set_time && (attrs->ia_valid & ATTR_CTIME)) {
1581 set_time = TRUE;
1582 /* Although Samba throws this field away
1583 it may be useful to Windows - but we do
1584 not want to set ctime unless some other
1585 timestamp is changing */
1586 cFYI(1, ("CIFS - CTIME changed"));
1587 time_buf.ChangeTime =
1588 cpu_to_le64(cifs_UnixTimeToNT(attrs->ia_ctime));
1589 } else
1590 time_buf.ChangeTime = 0;
1591
1592 if (set_time || set_dosattr) {
1593 time_buf.CreationTime = 0; /* do not change */
1594 /* In the future we should experiment - try setting timestamps
1595 via Handle (SetFileInfo) instead of by path */
1596 if (!(pTcon->ses->flags & CIFS_SES_NT4))
1597 rc = CIFSSMBSetTimes(xid, pTcon, full_path, &time_buf,
1598 cifs_sb->local_nls,
1599 cifs_sb->mnt_cifs_flags &
1600 CIFS_MOUNT_MAP_SPECIAL_CHR);
1601 else
1602 rc = -EOPNOTSUPP;
1603
1604 if (rc == -EOPNOTSUPP) {
1605 int oplock = FALSE;
1606 __u16 netfid;
1607
1608 cFYI(1, ("calling SetFileInfo since SetPathInfo for "
1609 "times not supported by this server"));
1610 /* BB we could scan to see if we already have it open
1611 and pass in pid of opener to function */
1612 rc = CIFSSMBOpen(xid, pTcon, full_path, FILE_OPEN,
1613 SYNCHRONIZE | FILE_WRITE_ATTRIBUTES,
1614 CREATE_NOT_DIR, &netfid, &oplock,
1615 NULL, cifs_sb->local_nls,
1616 cifs_sb->mnt_cifs_flags &
1617 CIFS_MOUNT_MAP_SPECIAL_CHR);
1618 if (rc == 0) {
1619 rc = CIFSSMBSetFileTimes(xid, pTcon, &time_buf,
1620 netfid);
1621 CIFSSMBClose(xid, pTcon, netfid);
1622 } else {
1623 /* BB For even older servers we could convert time_buf
1624 into old DOS style which uses two second
1625 granularity */
1626
1627 /* rc = CIFSSMBSetTimesLegacy(xid, pTcon, full_path,
1628 &time_buf, cifs_sb->local_nls); */
1629 }
1630 }
1631 /* Even if error on time set, no sense failing the call if
1632 the server would set the time to a reasonable value anyway,
1633 and this check ensures that we are not being called from
1634 sys_utimes in which case we ought to fail the call back to
1635 the user when the server rejects the call */
1636 if ((rc) && (attrs->ia_valid &
1637 (ATTR_MODE | ATTR_GID | ATTR_UID | ATTR_SIZE)))
1638 rc = 0;
1639 }
1640
1641 /* do not need local check to inode_check_ok since the server does
1642 that */
1643 if (!rc)
1644 rc = inode_setattr(direntry->d_inode, attrs);
1645 cifs_setattr_exit:
1646 kfree(full_path);
1647 FreeXid(xid);
1648 return rc;
1649 }
1650
1651 #if 0
1652 void cifs_delete_inode(struct inode *inode)
1653 {
1654 cFYI(1, ("In cifs_delete_inode, inode = 0x%p", inode));
1655 /* may have to add back in if and when safe distributed caching of
1656 directories added e.g. via FindNotify */
1657 }
1658 #endif
Linux kernel - Deliverables
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