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[CIFS] Fix mtime on cp -p when file data cached but written out too late
[linux-2.6/libata-dev.git] / fs / cifs / inode.c
blobe57e5c46ad48a2daea56c80bb911e5b8e1fc4098
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, const bool is_dfs_referral)
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 #ifdef CONFIG_CIFS_DFS_UPCALL
61 if (is_dfs_referral) {
62 inode->i_op = &cifs_dfs_referral_inode_operations;
63 } else {
64 #else /* NO DFS support, treat as a directory */
65 {
66 #endif
67 inode->i_op = &cifs_dir_inode_ops;
68 inode->i_fop = &cifs_dir_ops;
69 }
70 break;
71 case S_IFLNK:
72 inode->i_op = &cifs_symlink_inode_ops;
73 break;
74 default:
75 init_special_inode(inode, inode->i_mode, inode->i_rdev);
76 break;
77 }
78 }
79
80 static void cifs_unix_info_to_inode(struct inode *inode,
81 FILE_UNIX_BASIC_INFO *info, int force_uid_gid)
82 {
83 struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
84 struct cifsInodeInfo *cifsInfo = CIFS_I(inode);
85 __u64 num_of_bytes = le64_to_cpu(info->NumOfBytes);
86 __u64 end_of_file = le64_to_cpu(info->EndOfFile);
87
88 inode->i_atime = cifs_NTtimeToUnix(le64_to_cpu(info->LastAccessTime));
89 inode->i_mtime =
90 cifs_NTtimeToUnix(le64_to_cpu(info->LastModificationTime));
91 inode->i_ctime = cifs_NTtimeToUnix(le64_to_cpu(info->LastStatusChange));
92 inode->i_mode = le64_to_cpu(info->Permissions);
93
94 /*
95 * Since we set the inode type below we need to mask off
96 * to avoid strange results if bits set above.
97 */
98 inode->i_mode &= ~S_IFMT;
99 switch (le32_to_cpu(info->Type)) {
100 case UNIX_FILE:
101 inode->i_mode |= S_IFREG;
102 break;
103 case UNIX_SYMLINK:
104 inode->i_mode |= S_IFLNK;
105 break;
106 case UNIX_DIR:
107 inode->i_mode |= S_IFDIR;
108 break;
109 case UNIX_CHARDEV:
110 inode->i_mode |= S_IFCHR;
111 inode->i_rdev = MKDEV(le64_to_cpu(info->DevMajor),
112 le64_to_cpu(info->DevMinor) & MINORMASK);
113 break;
114 case UNIX_BLOCKDEV:
115 inode->i_mode |= S_IFBLK;
116 inode->i_rdev = MKDEV(le64_to_cpu(info->DevMajor),
117 le64_to_cpu(info->DevMinor) & MINORMASK);
118 break;
119 case UNIX_FIFO:
120 inode->i_mode |= S_IFIFO;
121 break;
122 case UNIX_SOCKET:
123 inode->i_mode |= S_IFSOCK;
124 break;
125 default:
126 /* safest to call it a file if we do not know */
127 inode->i_mode |= S_IFREG;
128 cFYI(1, ("unknown type %d", le32_to_cpu(info->Type)));
129 break;
130 }
131
132 if ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_OVERR_UID) &&
133 !force_uid_gid)
134 inode->i_uid = cifs_sb->mnt_uid;
135 else
136 inode->i_uid = le64_to_cpu(info->Uid);
137
138 if ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_OVERR_GID) &&
139 !force_uid_gid)
140 inode->i_gid = cifs_sb->mnt_gid;
141 else
142 inode->i_gid = le64_to_cpu(info->Gid);
143
144 inode->i_nlink = le64_to_cpu(info->Nlinks);
145
146 spin_lock(&inode->i_lock);
147 if (is_size_safe_to_change(cifsInfo, end_of_file)) {
148 /*
149 * We can not safely change the file size here if the client
150 * is writing to it due to potential races.
151 */
152 i_size_write(inode, end_of_file);
153
154 /*
155 * i_blocks is not related to (i_size / i_blksize),
156 * but instead 512 byte (2**9) size is required for
157 * calculating num blocks.
158 */
159 inode->i_blocks = (512 - 1 + num_of_bytes) >> 9;
160 }
161 spin_unlock(&inode->i_lock);
162 }
163
164 static const unsigned char *cifs_get_search_path(struct cifsTconInfo *pTcon,
165 const char *search_path)
166 {
167 int tree_len;
168 int path_len;
169 char *tmp_path;
170
171 if (!(pTcon->Flags & SMB_SHARE_IS_IN_DFS))
172 return search_path;
173
174 /* use full path name for working with DFS */
175 tree_len = strnlen(pTcon->treeName, MAX_TREE_SIZE + 1);
176 path_len = strnlen(search_path, MAX_PATHCONF);
177
178 tmp_path = kmalloc(tree_len+path_len+1, GFP_KERNEL);
179 if (tmp_path == NULL)
180 return search_path;
181
182 strncpy(tmp_path, pTcon->treeName, tree_len);
183 strncpy(tmp_path+tree_len, search_path, path_len);
184 tmp_path[tree_len+path_len] = 0;
185 return tmp_path;
186 }
187
188 int cifs_get_inode_info_unix(struct inode **pinode,
189 const unsigned char *search_path, struct super_block *sb, int xid)
190 {
191 int rc = 0;
192 FILE_UNIX_BASIC_INFO findData;
193 struct cifsTconInfo *pTcon;
194 struct inode *inode;
195 struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
196 const unsigned char *full_path;
197 bool is_dfs_referral = false;
198
199 pTcon = cifs_sb->tcon;
200 cFYI(1, ("Getting info on %s", search_path));
201
202 full_path = cifs_get_search_path(pTcon, search_path);
203
204 try_again_CIFSSMBUnixQPathInfo:
205 /* could have done a find first instead but this returns more info */
206 rc = CIFSSMBUnixQPathInfo(xid, pTcon, full_path, &findData,
207 cifs_sb->local_nls, cifs_sb->mnt_cifs_flags &
208 CIFS_MOUNT_MAP_SPECIAL_CHR);
209 /* dump_mem("\nUnixQPathInfo return data", &findData,
210 sizeof(findData)); */
211 if (rc) {
212 if (rc == -EREMOTE && !is_dfs_referral) {
213 is_dfs_referral = true;
214 full_path = search_path;
215 goto try_again_CIFSSMBUnixQPathInfo;
216 }
217 goto cgiiu_exit;
218 } else {
219 struct cifsInodeInfo *cifsInfo;
220 __u64 num_of_bytes = le64_to_cpu(findData.NumOfBytes);
221 __u64 end_of_file = le64_to_cpu(findData.EndOfFile);
222
223 /* get new inode */
224 if (*pinode == NULL) {
225 *pinode = new_inode(sb);
226 if (*pinode == NULL) {
227 rc = -ENOMEM;
228 goto cgiiu_exit;
229 }
230 /* Is an i_ino of zero legal? */
231 /* Are there sanity checks we can use to ensure that
232 the server is really filling in that field? */
233 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM) {
234 (*pinode)->i_ino =
235 (unsigned long)findData.UniqueId;
236 } /* note ino incremented to unique num in new_inode */
237 if (sb->s_flags & MS_NOATIME)
238 (*pinode)->i_flags |= S_NOATIME | S_NOCMTIME;
239
240 insert_inode_hash(*pinode);
241 }
242
243 inode = *pinode;
244 cifsInfo = CIFS_I(inode);
245
246 cFYI(1, ("Old time %ld", cifsInfo->time));
247 cifsInfo->time = jiffies;
248 cFYI(1, ("New time %ld", cifsInfo->time));
249 /* this is ok to set on every inode revalidate */
250 atomic_set(&cifsInfo->inUse, 1);
251
252 cifs_unix_info_to_inode(inode, &findData, 0);
253
254
255 if (num_of_bytes < end_of_file)
256 cFYI(1, ("allocation size less than end of file"));
257 cFYI(1, ("Size %ld and blocks %llu",
258 (unsigned long) inode->i_size,
259 (unsigned long long)inode->i_blocks));
260
261 cifs_set_ops(inode, is_dfs_referral);
262 }
263 cgiiu_exit:
264 if (full_path != search_path)
265 kfree(full_path);
266 return rc;
267 }
268
269 static int decode_sfu_inode(struct inode *inode, __u64 size,
270 const unsigned char *path,
271 struct cifs_sb_info *cifs_sb, int xid)
272 {
273 int rc;
274 int oplock = FALSE;
275 __u16 netfid;
276 struct cifsTconInfo *pTcon = cifs_sb->tcon;
277 char buf[24];
278 unsigned int bytes_read;
279 char *pbuf;
280
281 pbuf = buf;
282
283 if (size == 0) {
284 inode->i_mode |= S_IFIFO;
285 return 0;
286 } else if (size < 8) {
287 return -EINVAL; /* EOPNOTSUPP? */
288 }
289
290 rc = CIFSSMBOpen(xid, pTcon, path, FILE_OPEN, GENERIC_READ,
291 CREATE_NOT_DIR, &netfid, &oplock, NULL,
292 cifs_sb->local_nls,
293 cifs_sb->mnt_cifs_flags &
294 CIFS_MOUNT_MAP_SPECIAL_CHR);
295 if (rc == 0) {
296 int buf_type = CIFS_NO_BUFFER;
297 /* Read header */
298 rc = CIFSSMBRead(xid, pTcon,
299 netfid,
300 24 /* length */, 0 /* offset */,
301 &bytes_read, &pbuf, &buf_type);
302 if ((rc == 0) && (bytes_read >= 8)) {
303 if (memcmp("IntxBLK", pbuf, 8) == 0) {
304 cFYI(1, ("Block device"));
305 inode->i_mode |= S_IFBLK;
306 if (bytes_read == 24) {
307 /* we have enough to decode dev num */
308 __u64 mjr; /* major */
309 __u64 mnr; /* minor */
310 mjr = le64_to_cpu(*(__le64 *)(pbuf+8));
311 mnr = le64_to_cpu(*(__le64 *)(pbuf+16));
312 inode->i_rdev = MKDEV(mjr, mnr);
313 }
314 } else if (memcmp("IntxCHR", pbuf, 8) == 0) {
315 cFYI(1, ("Char device"));
316 inode->i_mode |= S_IFCHR;
317 if (bytes_read == 24) {
318 /* we have enough to decode dev num */
319 __u64 mjr; /* major */
320 __u64 mnr; /* minor */
321 mjr = le64_to_cpu(*(__le64 *)(pbuf+8));
322 mnr = le64_to_cpu(*(__le64 *)(pbuf+16));
323 inode->i_rdev = MKDEV(mjr, mnr);
324 }
325 } else if (memcmp("IntxLNK", pbuf, 7) == 0) {
326 cFYI(1, ("Symlink"));
327 inode->i_mode |= S_IFLNK;
328 } else {
329 inode->i_mode |= S_IFREG; /* file? */
330 rc = -EOPNOTSUPP;
331 }
332 } else {
333 inode->i_mode |= S_IFREG; /* then it is a file */
334 rc = -EOPNOTSUPP; /* or some unknown SFU type */
335 }
336 CIFSSMBClose(xid, pTcon, netfid);
337 }
338 return rc;
339 }
340
341 #define SFBITS_MASK (S_ISVTX | S_ISGID | S_ISUID) /* SETFILEBITS valid bits */
342
343 static int get_sfu_mode(struct inode *inode,
344 const unsigned char *path,
345 struct cifs_sb_info *cifs_sb, int xid)
346 {
347 #ifdef CONFIG_CIFS_XATTR
348 ssize_t rc;
349 char ea_value[4];
350 __u32 mode;
351
352 rc = CIFSSMBQueryEA(xid, cifs_sb->tcon, path, "SETFILEBITS",
353 ea_value, 4 /* size of buf */, cifs_sb->local_nls,
354 cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR);
355 if (rc < 0)
356 return (int)rc;
357 else if (rc > 3) {
358 mode = le32_to_cpu(*((__le32 *)ea_value));
359 inode->i_mode &= ~SFBITS_MASK;
360 cFYI(1, ("special bits 0%o org mode 0%o", mode, inode->i_mode));
361 inode->i_mode = (mode & SFBITS_MASK) | inode->i_mode;
362 cFYI(1, ("special mode bits 0%o", mode));
363 return 0;
364 } else {
365 return 0;
366 }
367 #else
368 return -EOPNOTSUPP;
369 #endif
370 }
371
372 int cifs_get_inode_info(struct inode **pinode,
373 const unsigned char *search_path, FILE_ALL_INFO *pfindData,
374 struct super_block *sb, int xid)
375 {
376 int rc = 0;
377 struct cifsTconInfo *pTcon;
378 struct inode *inode;
379 struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
380 const unsigned char *full_path = NULL;
381 char *buf = NULL;
382 int adjustTZ = FALSE;
383 bool is_dfs_referral = false;
384
385 pTcon = cifs_sb->tcon;
386 cFYI(1, ("Getting info on %s", search_path));
387
388 if ((pfindData == NULL) && (*pinode != NULL)) {
389 if (CIFS_I(*pinode)->clientCanCacheRead) {
390 cFYI(1, ("No need to revalidate cached inode sizes"));
391 return rc;
392 }
393 }
394
395 /* if file info not passed in then get it from server */
396 if (pfindData == NULL) {
397 buf = kmalloc(sizeof(FILE_ALL_INFO), GFP_KERNEL);
398 if (buf == NULL)
399 return -ENOMEM;
400 pfindData = (FILE_ALL_INFO *)buf;
401
402 full_path = cifs_get_search_path(pTcon, search_path);
403
404 try_again_CIFSSMBQPathInfo:
405 /* could do find first instead but this returns more info */
406 rc = CIFSSMBQPathInfo(xid, pTcon, full_path, pfindData,
407 0 /* not legacy */,
408 cifs_sb->local_nls, cifs_sb->mnt_cifs_flags &
409 CIFS_MOUNT_MAP_SPECIAL_CHR);
410 /* BB optimize code so we do not make the above call
411 when server claims no NT SMB support and the above call
412 failed at least once - set flag in tcon or mount */
413 if ((rc == -EOPNOTSUPP) || (rc == -EINVAL)) {
414 rc = SMBQueryInformation(xid, pTcon, full_path,
415 pfindData, cifs_sb->local_nls,
416 cifs_sb->mnt_cifs_flags &
417 CIFS_MOUNT_MAP_SPECIAL_CHR);
418 adjustTZ = TRUE;
419 }
420 }
421 /* dump_mem("\nQPathInfo return data",&findData, sizeof(findData)); */
422 if (rc) {
423 if (rc == -EREMOTE && !is_dfs_referral) {
424 is_dfs_referral = true;
425 full_path = search_path;
426 goto try_again_CIFSSMBQPathInfo;
427 }
428 goto cgii_exit;
429 } else {
430 struct cifsInodeInfo *cifsInfo;
431 __u32 attr = le32_to_cpu(pfindData->Attributes);
432
433 /* get new inode */
434 if (*pinode == NULL) {
435 *pinode = new_inode(sb);
436 if (*pinode == NULL) {
437 rc = -ENOMEM;
438 goto cgii_exit;
439 }
440 /* Is an i_ino of zero legal? Can we use that to check
441 if the server supports returning inode numbers? Are
442 there other sanity checks we can use to ensure that
443 the server is really filling in that field? */
444
445 /* We can not use the IndexNumber field by default from
446 Windows or Samba (in ALL_INFO buf) but we can request
447 it explicitly. It may not be unique presumably if
448 the server has multiple devices mounted under one
449 share */
450
451 /* There may be higher info levels that work but are
452 there Windows server or network appliances for which
453 IndexNumber field is not guaranteed unique? */
454
455 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM) {
456 int rc1 = 0;
457 __u64 inode_num;
458
459 rc1 = CIFSGetSrvInodeNumber(xid, pTcon,
460 search_path, &inode_num,
461 cifs_sb->local_nls,
462 cifs_sb->mnt_cifs_flags &
463 CIFS_MOUNT_MAP_SPECIAL_CHR);
464 if (rc1) {
465 cFYI(1, ("GetSrvInodeNum rc %d", rc1));
466 /* BB EOPNOSUPP disable SERVER_INUM? */
467 } else /* do we need cast or hash to ino? */
468 (*pinode)->i_ino = inode_num;
469 } /* else ino incremented to unique num in new_inode*/
470 if (sb->s_flags & MS_NOATIME)
471 (*pinode)->i_flags |= S_NOATIME | S_NOCMTIME;
472 insert_inode_hash(*pinode);
473 }
474 inode = *pinode;
475 cifsInfo = CIFS_I(inode);
476 cifsInfo->cifsAttrs = attr;
477 cFYI(1, ("Old time %ld", cifsInfo->time));
478 cifsInfo->time = jiffies;
479 cFYI(1, ("New time %ld", cifsInfo->time));
480
481 /* blksize needs to be multiple of two. So safer to default to
482 blksize and blkbits set in superblock so 2**blkbits and blksize
483 will match rather than setting to:
484 (pTcon->ses->server->maxBuf - MAX_CIFS_HDR_SIZE) & 0xFFFFFE00;*/
485
486 /* Linux can not store file creation time so ignore it */
487 if (pfindData->LastAccessTime)
488 inode->i_atime = cifs_NTtimeToUnix
489 (le64_to_cpu(pfindData->LastAccessTime));
490 else /* do not need to use current_fs_time - time not stored */
491 inode->i_atime = CURRENT_TIME;
492 inode->i_mtime =
493 cifs_NTtimeToUnix(le64_to_cpu(pfindData->LastWriteTime));
494 inode->i_ctime =
495 cifs_NTtimeToUnix(le64_to_cpu(pfindData->ChangeTime));
496 cFYI(0, ("Attributes came in as 0x%x", attr));
497 if (adjustTZ && (pTcon->ses) && (pTcon->ses->server)) {
498 inode->i_ctime.tv_sec += pTcon->ses->server->timeAdj;
499 inode->i_mtime.tv_sec += pTcon->ses->server->timeAdj;
500 }
501
502 /* set default mode. will override for dirs below */
503 if (atomic_read(&cifsInfo->inUse) == 0)
504 /* new inode, can safely set these fields */
505 inode->i_mode = cifs_sb->mnt_file_mode;
506 else /* since we set the inode type below we need to mask off
507 to avoid strange results if type changes and both
508 get orred in */
509 inode->i_mode &= ~S_IFMT;
510 /* if (attr & ATTR_REPARSE) */
511 /* We no longer handle these as symlinks because we could not
512 follow them due to the absolute path with drive letter */
513 if (attr & ATTR_DIRECTORY) {
514 /* override default perms since we do not do byte range locking
515 on dirs */
516 inode->i_mode = cifs_sb->mnt_dir_mode;
517 inode->i_mode |= S_IFDIR;
518 } else if ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_UNX_EMUL) &&
519 (cifsInfo->cifsAttrs & ATTR_SYSTEM) &&
520 /* No need to le64 convert size of zero */
521 (pfindData->EndOfFile == 0)) {
522 inode->i_mode = cifs_sb->mnt_file_mode;
523 inode->i_mode |= S_IFIFO;
524 /* BB Finish for SFU style symlinks and devices */
525 } else if ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_UNX_EMUL) &&
526 (cifsInfo->cifsAttrs & ATTR_SYSTEM)) {
527 if (decode_sfu_inode(inode,
528 le64_to_cpu(pfindData->EndOfFile),
529 search_path,
530 cifs_sb, xid))
531 cFYI(1, ("Unrecognized sfu inode type"));
532
533 cFYI(1, ("sfu mode 0%o", inode->i_mode));
534 } else {
535 inode->i_mode |= S_IFREG;
536 /* treat the dos attribute of read-only as read-only
537 mode e.g. 555 */
538 if (cifsInfo->cifsAttrs & ATTR_READONLY)
539 inode->i_mode &= ~(S_IWUGO);
540 else if ((inode->i_mode & S_IWUGO) == 0)
541 /* the ATTR_READONLY flag may have been */
542 /* changed on server -- set any w bits */
543 /* allowed by mnt_file_mode */
544 inode->i_mode |= (S_IWUGO &
545 cifs_sb->mnt_file_mode);
546 /* BB add code here -
547 validate if device or weird share or device type? */
548 }
549
550 spin_lock(&inode->i_lock);
551 if (is_size_safe_to_change(cifsInfo,
552 le64_to_cpu(pfindData->EndOfFile))) {
553 /* can not safely shrink the file size here if the
554 client is writing to it due to potential races */
555 i_size_write(inode, le64_to_cpu(pfindData->EndOfFile));
556
557 /* 512 bytes (2**9) is the fake blocksize that must be
558 used for this calculation */
559 inode->i_blocks = (512 - 1 + le64_to_cpu(
560 pfindData->AllocationSize)) >> 9;
561 }
562 spin_unlock(&inode->i_lock);
563
564 inode->i_nlink = le32_to_cpu(pfindData->NumberOfLinks);
565
566 /* BB fill in uid and gid here? with help from winbind?
567 or retrieve from NTFS stream extended attribute */
568 #ifdef CONFIG_CIFS_EXPERIMENTAL
569 /* fill in 0777 bits from ACL */
570 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_CIFS_ACL) {
571 cFYI(1, ("Getting mode bits from ACL"));
572 acl_to_uid_mode(inode, search_path);
573 }
574 #endif
575 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_UNX_EMUL) {
576 /* fill in remaining high mode bits e.g. SUID, VTX */
577 get_sfu_mode(inode, search_path, cifs_sb, xid);
578 } else if (atomic_read(&cifsInfo->inUse) == 0) {
579 inode->i_uid = cifs_sb->mnt_uid;
580 inode->i_gid = cifs_sb->mnt_gid;
581 /* set so we do not keep refreshing these fields with
582 bad data after user has changed them in memory */
583 atomic_set(&cifsInfo->inUse, 1);
584 }
585
586 cifs_set_ops(inode, is_dfs_referral);
587 }
588 cgii_exit:
589 if (full_path != search_path)
590 kfree(full_path);
591 kfree(buf);
592 return rc;
593 }
594
595 static const struct inode_operations cifs_ipc_inode_ops = {
596 .lookup = cifs_lookup,
597 };
598
599 /* gets root inode */
600 struct inode *cifs_iget(struct super_block *sb, unsigned long ino)
601 {
602 int xid;
603 struct cifs_sb_info *cifs_sb;
604 struct inode *inode;
605 long rc;
606
607 inode = iget_locked(sb, ino);
608 if (!inode)
609 return ERR_PTR(-ENOMEM);
610 if (!(inode->i_state & I_NEW))
611 return inode;
612
613 cifs_sb = CIFS_SB(inode->i_sb);
614 xid = GetXid();
615
616 if (cifs_sb->tcon->unix_ext)
617 rc = cifs_get_inode_info_unix(&inode, "", inode->i_sb, xid);
618 else
619 rc = cifs_get_inode_info(&inode, "", NULL, inode->i_sb, xid);
620 if (rc && cifs_sb->tcon->ipc) {
621 cFYI(1, ("ipc connection - fake read inode"));
622 inode->i_mode |= S_IFDIR;
623 inode->i_nlink = 2;
624 inode->i_op = &cifs_ipc_inode_ops;
625 inode->i_fop = &simple_dir_operations;
626 inode->i_uid = cifs_sb->mnt_uid;
627 inode->i_gid = cifs_sb->mnt_gid;
628 _FreeXid(xid);
629 iget_failed(inode);
630 return ERR_PTR(rc);
631 }
632
633 unlock_new_inode(inode);
634
635 /* can not call macro FreeXid here since in a void func
636 * TODO: This is no longer true
637 */
638 _FreeXid(xid);
639 return inode;
640 }
641
642 int cifs_unlink(struct inode *inode, struct dentry *direntry)
643 {
644 int rc = 0;
645 int xid;
646 struct cifs_sb_info *cifs_sb;
647 struct cifsTconInfo *pTcon;
648 char *full_path = NULL;
649 struct cifsInodeInfo *cifsInode;
650 FILE_BASIC_INFO *pinfo_buf;
651
652 cFYI(1, ("cifs_unlink, inode = 0x%p", inode));
653
654 xid = GetXid();
655
656 if (inode)
657 cifs_sb = CIFS_SB(inode->i_sb);
658 else
659 cifs_sb = CIFS_SB(direntry->d_sb);
660 pTcon = cifs_sb->tcon;
661
662 /* Unlink can be called from rename so we can not grab the sem here
663 since we deadlock otherwise */
664 /* mutex_lock(&direntry->d_sb->s_vfs_rename_mutex);*/
665 full_path = build_path_from_dentry(direntry);
666 /* mutex_unlock(&direntry->d_sb->s_vfs_rename_mutex);*/
667 if (full_path == NULL) {
668 FreeXid(xid);
669 return -ENOMEM;
670 }
671
672 if ((pTcon->ses->capabilities & CAP_UNIX) &&
673 (CIFS_UNIX_POSIX_PATH_OPS_CAP &
674 le64_to_cpu(pTcon->fsUnixInfo.Capability))) {
675 rc = CIFSPOSIXDelFile(xid, pTcon, full_path,
676 SMB_POSIX_UNLINK_FILE_TARGET, cifs_sb->local_nls,
677 cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR);
678 cFYI(1, ("posix del rc %d", rc));
679 if ((rc == 0) || (rc == -ENOENT))
680 goto psx_del_no_retry;
681 }
682
683 rc = CIFSSMBDelFile(xid, pTcon, full_path, cifs_sb->local_nls,
684 cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR);
685 psx_del_no_retry:
686 if (!rc) {
687 if (direntry->d_inode)
688 drop_nlink(direntry->d_inode);
689 } else if (rc == -ENOENT) {
690 d_drop(direntry);
691 } else if (rc == -ETXTBSY) {
692 int oplock = FALSE;
693 __u16 netfid;
694
695 rc = CIFSSMBOpen(xid, pTcon, full_path, FILE_OPEN, DELETE,
696 CREATE_NOT_DIR | CREATE_DELETE_ON_CLOSE,
697 &netfid, &oplock, NULL, cifs_sb->local_nls,
698 cifs_sb->mnt_cifs_flags &
699 CIFS_MOUNT_MAP_SPECIAL_CHR);
700 if (rc == 0) {
701 CIFSSMBRenameOpenFile(xid, pTcon, netfid, NULL,
702 cifs_sb->local_nls,
703 cifs_sb->mnt_cifs_flags &
704 CIFS_MOUNT_MAP_SPECIAL_CHR);
705 CIFSSMBClose(xid, pTcon, netfid);
706 if (direntry->d_inode)
707 drop_nlink(direntry->d_inode);
708 }
709 } else if (rc == -EACCES) {
710 /* try only if r/o attribute set in local lookup data? */
711 pinfo_buf = kzalloc(sizeof(FILE_BASIC_INFO), GFP_KERNEL);
712 if (pinfo_buf) {
713 /* ATTRS set to normal clears r/o bit */
714 pinfo_buf->Attributes = cpu_to_le32(ATTR_NORMAL);
715 if (!(pTcon->ses->flags & CIFS_SES_NT4))
716 rc = CIFSSMBSetTimes(xid, pTcon, full_path,
717 pinfo_buf,
718 cifs_sb->local_nls,
719 cifs_sb->mnt_cifs_flags &
720 CIFS_MOUNT_MAP_SPECIAL_CHR);
721 else
722 rc = -EOPNOTSUPP;
723
724 if (rc == -EOPNOTSUPP) {
725 int oplock = FALSE;
726 __u16 netfid;
727 /* rc = CIFSSMBSetAttrLegacy(xid, pTcon,
728 full_path,
729 (__u16)ATTR_NORMAL,
730 cifs_sb->local_nls);
731 For some strange reason it seems that NT4 eats the
732 old setattr call without actually setting the
733 attributes so on to the third attempted workaround
734 */
735
736 /* BB could scan to see if we already have it open
737 and pass in pid of opener to function */
738 rc = CIFSSMBOpen(xid, pTcon, full_path,
739 FILE_OPEN, SYNCHRONIZE |
740 FILE_WRITE_ATTRIBUTES, 0,
741 &netfid, &oplock, NULL,
742 cifs_sb->local_nls,
743 cifs_sb->mnt_cifs_flags &
744 CIFS_MOUNT_MAP_SPECIAL_CHR);
745 if (rc == 0) {
746 rc = CIFSSMBSetFileTimes(xid, pTcon,
747 pinfo_buf,
748 netfid);
749 CIFSSMBClose(xid, pTcon, netfid);
750 }
751 }
752 kfree(pinfo_buf);
753 }
754 if (rc == 0) {
755 rc = CIFSSMBDelFile(xid, pTcon, full_path,
756 cifs_sb->local_nls,
757 cifs_sb->mnt_cifs_flags &
758 CIFS_MOUNT_MAP_SPECIAL_CHR);
759 if (!rc) {
760 if (direntry->d_inode)
761 drop_nlink(direntry->d_inode);
762 } else if (rc == -ETXTBSY) {
763 int oplock = FALSE;
764 __u16 netfid;
765
766 rc = CIFSSMBOpen(xid, pTcon, full_path,
767 FILE_OPEN, DELETE,
768 CREATE_NOT_DIR |
769 CREATE_DELETE_ON_CLOSE,
770 &netfid, &oplock, NULL,
771 cifs_sb->local_nls,
772 cifs_sb->mnt_cifs_flags &
773 CIFS_MOUNT_MAP_SPECIAL_CHR);
774 if (rc == 0) {
775 CIFSSMBRenameOpenFile(xid, pTcon,
776 netfid, NULL,
777 cifs_sb->local_nls,
778 cifs_sb->mnt_cifs_flags &
779 CIFS_MOUNT_MAP_SPECIAL_CHR);
780 CIFSSMBClose(xid, pTcon, netfid);
781 if (direntry->d_inode)
782 drop_nlink(direntry->d_inode);
783 }
784 /* BB if rc = -ETXTBUSY goto the rename logic BB */
785 }
786 }
787 }
788 if (direntry->d_inode) {
789 cifsInode = CIFS_I(direntry->d_inode);
790 cifsInode->time = 0; /* will force revalidate to get info
791 when needed */
792 direntry->d_inode->i_ctime = current_fs_time(inode->i_sb);
793 }
794 if (inode) {
795 inode->i_ctime = inode->i_mtime = current_fs_time(inode->i_sb);
796 cifsInode = CIFS_I(inode);
797 cifsInode->time = 0; /* force revalidate of dir as well */
798 }
799
800 kfree(full_path);
801 FreeXid(xid);
802 return rc;
803 }
804
805 static void posix_fill_in_inode(struct inode *tmp_inode,
806 FILE_UNIX_BASIC_INFO *pData, int isNewInode)
807 {
808 struct cifsInodeInfo *cifsInfo = CIFS_I(tmp_inode);
809 loff_t local_size;
810 struct timespec local_mtime;
811
812 cifsInfo->time = jiffies;
813 atomic_inc(&cifsInfo->inUse);
814
815 /* save mtime and size */
816 local_mtime = tmp_inode->i_mtime;
817 local_size = tmp_inode->i_size;
818
819 cifs_unix_info_to_inode(tmp_inode, pData, 1);
820 cifs_set_ops(tmp_inode, false);
821
822 if (!S_ISREG(tmp_inode->i_mode))
823 return;
824
825 /*
826 * No sense invalidating pages for new inode
827 * since we we have not started caching
828 * readahead file data yet.
829 */
830 if (isNewInode)
831 return;
832
833 if (timespec_equal(&tmp_inode->i_mtime, &local_mtime) &&
834 (local_size == tmp_inode->i_size)) {
835 cFYI(1, ("inode exists but unchanged"));
836 } else {
837 /* file may have changed on server */
838 cFYI(1, ("invalidate inode, readdir detected change"));
839 invalidate_remote_inode(tmp_inode);
840 }
841 }
842
843 int cifs_mkdir(struct inode *inode, struct dentry *direntry, int mode)
844 {
845 int rc = 0;
846 int xid;
847 struct cifs_sb_info *cifs_sb;
848 struct cifsTconInfo *pTcon;
849 char *full_path = NULL;
850 struct inode *newinode = NULL;
851
852 cFYI(1, ("In cifs_mkdir, mode = 0x%x inode = 0x%p", mode, inode));
853
854 xid = GetXid();
855
856 cifs_sb = CIFS_SB(inode->i_sb);
857 pTcon = cifs_sb->tcon;
858
859 full_path = build_path_from_dentry(direntry);
860 if (full_path == NULL) {
861 FreeXid(xid);
862 return -ENOMEM;
863 }
864
865 if ((pTcon->ses->capabilities & CAP_UNIX) &&
866 (CIFS_UNIX_POSIX_PATH_OPS_CAP &
867 le64_to_cpu(pTcon->fsUnixInfo.Capability))) {
868 u32 oplock = 0;
869 FILE_UNIX_BASIC_INFO *pInfo =
870 kzalloc(sizeof(FILE_UNIX_BASIC_INFO), GFP_KERNEL);
871 if (pInfo == NULL) {
872 rc = -ENOMEM;
873 goto mkdir_out;
874 }
875
876 mode &= ~current->fs->umask;
877 rc = CIFSPOSIXCreate(xid, pTcon, SMB_O_DIRECTORY | SMB_O_CREAT,
878 mode, NULL /* netfid */, pInfo, &oplock,
879 full_path, cifs_sb->local_nls,
880 cifs_sb->mnt_cifs_flags &
881 CIFS_MOUNT_MAP_SPECIAL_CHR);
882 if (rc == -EOPNOTSUPP) {
883 kfree(pInfo);
884 goto mkdir_retry_old;
885 } else if (rc) {
886 cFYI(1, ("posix mkdir returned 0x%x", rc));
887 d_drop(direntry);
888 } else {
889 if (pInfo->Type == cpu_to_le32(-1)) {
890 /* no return info, go query for it */
891 kfree(pInfo);
892 goto mkdir_get_info;
893 }
894 /*BB check (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SET_UID ) to see if need
895 to set uid/gid */
896 inc_nlink(inode);
897 if (pTcon->nocase)
898 direntry->d_op = &cifs_ci_dentry_ops;
899 else
900 direntry->d_op = &cifs_dentry_ops;
901
902 newinode = new_inode(inode->i_sb);
903 if (newinode == NULL) {
904 kfree(pInfo);
905 goto mkdir_get_info;
906 }
907 /* Is an i_ino of zero legal? */
908 /* Are there sanity checks we can use to ensure that
909 the server is really filling in that field? */
910 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM) {
911 newinode->i_ino =
912 (unsigned long)pInfo->UniqueId;
913 } /* note ino incremented to unique num in new_inode */
914 if (inode->i_sb->s_flags & MS_NOATIME)
915 newinode->i_flags |= S_NOATIME | S_NOCMTIME;
916 newinode->i_nlink = 2;
917
918 insert_inode_hash(newinode);
919 d_instantiate(direntry, newinode);
920
921 /* we already checked in POSIXCreate whether
922 frame was long enough */
923 posix_fill_in_inode(direntry->d_inode,
924 pInfo, 1 /* NewInode */);
925 #ifdef CONFIG_CIFS_DEBUG2
926 cFYI(1, ("instantiated dentry %p %s to inode %p",
927 direntry, direntry->d_name.name, newinode));
928
929 if (newinode->i_nlink != 2)
930 cFYI(1, ("unexpected number of links %d",
931 newinode->i_nlink));
932 #endif
933 }
934 kfree(pInfo);
935 goto mkdir_out;
936 }
937 mkdir_retry_old:
938 /* BB add setting the equivalent of mode via CreateX w/ACLs */
939 rc = CIFSSMBMkDir(xid, pTcon, full_path, cifs_sb->local_nls,
940 cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR);
941 if (rc) {
942 cFYI(1, ("cifs_mkdir returned 0x%x", rc));
943 d_drop(direntry);
944 } else {
945 mkdir_get_info:
946 inc_nlink(inode);
947 if (pTcon->unix_ext)
948 rc = cifs_get_inode_info_unix(&newinode, full_path,
949 inode->i_sb, xid);
950 else
951 rc = cifs_get_inode_info(&newinode, full_path, NULL,
952 inode->i_sb, xid);
953
954 if (pTcon->nocase)
955 direntry->d_op = &cifs_ci_dentry_ops;
956 else
957 direntry->d_op = &cifs_dentry_ops;
958 d_instantiate(direntry, newinode);
959 /* setting nlink not necessary except in cases where we
960 * failed to get it from the server or was set bogus */
961 if ((direntry->d_inode) && (direntry->d_inode->i_nlink < 2))
962 direntry->d_inode->i_nlink = 2;
963 if (pTcon->unix_ext) {
964 mode &= ~current->fs->umask;
965 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SET_UID) {
966 CIFSSMBUnixSetPerms(xid, pTcon, full_path,
967 mode,
968 (__u64)current->fsuid,
969 (__u64)current->fsgid,
970 0 /* dev_t */,
971 cifs_sb->local_nls,
972 cifs_sb->mnt_cifs_flags &
973 CIFS_MOUNT_MAP_SPECIAL_CHR);
974 } else {
975 CIFSSMBUnixSetPerms(xid, pTcon, full_path,
976 mode, (__u64)-1,
977 (__u64)-1, 0 /* dev_t */,
978 cifs_sb->local_nls,
979 cifs_sb->mnt_cifs_flags &
980 CIFS_MOUNT_MAP_SPECIAL_CHR);
981 }
982 } else {
983 /* BB to be implemented via Windows secrty descriptors
984 eg CIFSSMBWinSetPerms(xid, pTcon, full_path, mode,
985 -1, -1, local_nls); */
986 if (direntry->d_inode) {
987 direntry->d_inode->i_mode = mode;
988 direntry->d_inode->i_mode |= S_IFDIR;
989 if (cifs_sb->mnt_cifs_flags &
990 CIFS_MOUNT_SET_UID) {
991 direntry->d_inode->i_uid =
992 current->fsuid;
993 direntry->d_inode->i_gid =
994 current->fsgid;
995 }
996 }
997 }
998 }
999 mkdir_out:
1000 kfree(full_path);
1001 FreeXid(xid);
1002 return rc;
1003 }
1004
1005 int cifs_rmdir(struct inode *inode, struct dentry *direntry)
1006 {
1007 int rc = 0;
1008 int xid;
1009 struct cifs_sb_info *cifs_sb;
1010 struct cifsTconInfo *pTcon;
1011 char *full_path = NULL;
1012 struct cifsInodeInfo *cifsInode;
1013
1014 cFYI(1, ("cifs_rmdir, inode = 0x%p", inode));
1015
1016 xid = GetXid();
1017
1018 cifs_sb = CIFS_SB(inode->i_sb);
1019 pTcon = cifs_sb->tcon;
1020
1021 full_path = build_path_from_dentry(direntry);
1022 if (full_path == NULL) {
1023 FreeXid(xid);
1024 return -ENOMEM;
1025 }
1026
1027 rc = CIFSSMBRmDir(xid, pTcon, full_path, cifs_sb->local_nls,
1028 cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR);
1029
1030 if (!rc) {
1031 drop_nlink(inode);
1032 spin_lock(&direntry->d_inode->i_lock);
1033 i_size_write(direntry->d_inode, 0);
1034 clear_nlink(direntry->d_inode);
1035 spin_unlock(&direntry->d_inode->i_lock);
1036 }
1037
1038 cifsInode = CIFS_I(direntry->d_inode);
1039 cifsInode->time = 0; /* force revalidate to go get info when
1040 needed */
1041 direntry->d_inode->i_ctime = inode->i_ctime = inode->i_mtime =
1042 current_fs_time(inode->i_sb);
1043
1044 kfree(full_path);
1045 FreeXid(xid);
1046 return rc;
1047 }
1048
1049 int cifs_rename(struct inode *source_inode, struct dentry *source_direntry,
1050 struct inode *target_inode, struct dentry *target_direntry)
1051 {
1052 char *fromName;
1053 char *toName;
1054 struct cifs_sb_info *cifs_sb_source;
1055 struct cifs_sb_info *cifs_sb_target;
1056 struct cifsTconInfo *pTcon;
1057 int xid;
1058 int rc = 0;
1059
1060 xid = GetXid();
1061
1062 cifs_sb_target = CIFS_SB(target_inode->i_sb);
1063 cifs_sb_source = CIFS_SB(source_inode->i_sb);
1064 pTcon = cifs_sb_source->tcon;
1065
1066 if (pTcon != cifs_sb_target->tcon) {
1067 FreeXid(xid);
1068 return -EXDEV; /* BB actually could be allowed if same server,
1069 but different share.
1070 Might eventually add support for this */
1071 }
1072
1073 /* we already have the rename sem so we do not need to grab it again
1074 here to protect the path integrity */
1075 fromName = build_path_from_dentry(source_direntry);
1076 toName = build_path_from_dentry(target_direntry);
1077 if ((fromName == NULL) || (toName == NULL)) {
1078 rc = -ENOMEM;
1079 goto cifs_rename_exit;
1080 }
1081
1082 rc = CIFSSMBRename(xid, pTcon, fromName, toName,
1083 cifs_sb_source->local_nls,
1084 cifs_sb_source->mnt_cifs_flags &
1085 CIFS_MOUNT_MAP_SPECIAL_CHR);
1086 if (rc == -EEXIST) {
1087 /* check if they are the same file because rename of hardlinked
1088 files is a noop */
1089 FILE_UNIX_BASIC_INFO *info_buf_source;
1090 FILE_UNIX_BASIC_INFO *info_buf_target;
1091
1092 info_buf_source =
1093 kmalloc(2 * sizeof(FILE_UNIX_BASIC_INFO), GFP_KERNEL);
1094 if (info_buf_source != NULL) {
1095 info_buf_target = info_buf_source + 1;
1096 if (pTcon->unix_ext)
1097 rc = CIFSSMBUnixQPathInfo(xid, pTcon, fromName,
1098 info_buf_source,
1099 cifs_sb_source->local_nls,
1100 cifs_sb_source->mnt_cifs_flags &
1101 CIFS_MOUNT_MAP_SPECIAL_CHR);
1102 /* else rc is still EEXIST so will fall through to
1103 unlink the target and retry rename */
1104 if (rc == 0) {
1105 rc = CIFSSMBUnixQPathInfo(xid, pTcon, toName,
1106 info_buf_target,
1107 cifs_sb_target->local_nls,
1108 /* remap based on source sb */
1109 cifs_sb_source->mnt_cifs_flags &
1110 CIFS_MOUNT_MAP_SPECIAL_CHR);
1111 }
1112 if ((rc == 0) &&
1113 (info_buf_source->UniqueId ==
1114 info_buf_target->UniqueId)) {
1115 /* do not rename since the files are hardlinked which
1116 is a noop */
1117 } else {
1118 /* we either can not tell the files are hardlinked
1119 (as with Windows servers) or files are not
1120 hardlinked so delete the target manually before
1121 renaming to follow POSIX rather than Windows
1122 semantics */
1123 cifs_unlink(target_inode, target_direntry);
1124 rc = CIFSSMBRename(xid, pTcon, fromName,
1125 toName,
1126 cifs_sb_source->local_nls,
1127 cifs_sb_source->mnt_cifs_flags
1128 & CIFS_MOUNT_MAP_SPECIAL_CHR);
1129 }
1130 kfree(info_buf_source);
1131 } /* if we can not get memory just leave rc as EEXIST */
1132 }
1133
1134 if (rc)
1135 cFYI(1, ("rename rc %d", rc));
1136
1137 if ((rc == -EIO) || (rc == -EEXIST)) {
1138 int oplock = FALSE;
1139 __u16 netfid;
1140
1141 /* BB FIXME Is Generic Read correct for rename? */
1142 /* if renaming directory - we should not say CREATE_NOT_DIR,
1143 need to test renaming open directory, also GENERIC_READ
1144 might not right be right access to request */
1145 rc = CIFSSMBOpen(xid, pTcon, fromName, FILE_OPEN, GENERIC_READ,
1146 CREATE_NOT_DIR, &netfid, &oplock, NULL,
1147 cifs_sb_source->local_nls,
1148 cifs_sb_source->mnt_cifs_flags &
1149 CIFS_MOUNT_MAP_SPECIAL_CHR);
1150 if (rc == 0) {
1151 rc = CIFSSMBRenameOpenFile(xid, pTcon, netfid, toName,
1152 cifs_sb_source->local_nls,
1153 cifs_sb_source->mnt_cifs_flags &
1154 CIFS_MOUNT_MAP_SPECIAL_CHR);
1155 CIFSSMBClose(xid, pTcon, netfid);
1156 }
1157 }
1158
1159 cifs_rename_exit:
1160 kfree(fromName);
1161 kfree(toName);
1162 FreeXid(xid);
1163 return rc;
1164 }
1165
1166 int cifs_revalidate(struct dentry *direntry)
1167 {
1168 int xid;
1169 int rc = 0, wbrc = 0;
1170 char *full_path;
1171 struct cifs_sb_info *cifs_sb;
1172 struct cifsInodeInfo *cifsInode;
1173 loff_t local_size;
1174 struct timespec local_mtime;
1175 int invalidate_inode = FALSE;
1176
1177 if (direntry->d_inode == NULL)
1178 return -ENOENT;
1179
1180 cifsInode = CIFS_I(direntry->d_inode);
1181
1182 if (cifsInode == NULL)
1183 return -ENOENT;
1184
1185 /* no sense revalidating inode info on file that no one can write */
1186 if (CIFS_I(direntry->d_inode)->clientCanCacheRead)
1187 return rc;
1188
1189 xid = GetXid();
1190
1191 cifs_sb = CIFS_SB(direntry->d_sb);
1192
1193 /* can not safely grab the rename sem here if rename calls revalidate
1194 since that would deadlock */
1195 full_path = build_path_from_dentry(direntry);
1196 if (full_path == NULL) {
1197 FreeXid(xid);
1198 return -ENOMEM;
1199 }
1200 cFYI(1, ("Revalidate: %s inode 0x%p count %d dentry: 0x%p d_time %ld "
1201 "jiffies %ld", full_path, direntry->d_inode,
1202 direntry->d_inode->i_count.counter, direntry,
1203 direntry->d_time, jiffies));
1204
1205 if (cifsInode->time == 0) {
1206 /* was set to zero previously to force revalidate */
1207 } else if (time_before(jiffies, cifsInode->time + HZ) &&
1208 lookupCacheEnabled) {
1209 if ((S_ISREG(direntry->d_inode->i_mode) == 0) ||
1210 (direntry->d_inode->i_nlink == 1)) {
1211 kfree(full_path);
1212 FreeXid(xid);
1213 return rc;
1214 } else {
1215 cFYI(1, ("Have to revalidate file due to hardlinks"));
1216 }
1217 }
1218
1219 /* save mtime and size */
1220 local_mtime = direntry->d_inode->i_mtime;
1221 local_size = direntry->d_inode->i_size;
1222
1223 if (cifs_sb->tcon->unix_ext) {
1224 rc = cifs_get_inode_info_unix(&direntry->d_inode, full_path,
1225 direntry->d_sb, xid);
1226 if (rc) {
1227 cFYI(1, ("error on getting revalidate info %d", rc));
1228 /* if (rc != -ENOENT)
1229 rc = 0; */ /* BB should we cache info on
1230 certain errors? */
1231 }
1232 } else {
1233 rc = cifs_get_inode_info(&direntry->d_inode, full_path, NULL,
1234 direntry->d_sb, xid);
1235 if (rc) {
1236 cFYI(1, ("error on getting revalidate info %d", rc));
1237 /* if (rc != -ENOENT)
1238 rc = 0; */ /* BB should we cache info on
1239 certain errors? */
1240 }
1241 }
1242 /* should we remap certain errors, access denied?, to zero */
1243
1244 /* if not oplocked, we invalidate inode pages if mtime or file size
1245 had changed on server */
1246
1247 if (timespec_equal(&local_mtime, &direntry->d_inode->i_mtime) &&
1248 (local_size == direntry->d_inode->i_size)) {
1249 cFYI(1, ("cifs_revalidate - inode unchanged"));
1250 } else {
1251 /* file may have changed on server */
1252 if (cifsInode->clientCanCacheRead) {
1253 /* no need to invalidate inode pages since we were the
1254 only ones who could have modified the file and the
1255 server copy is staler than ours */
1256 } else {
1257 invalidate_inode = TRUE;
1258 }
1259 }
1260
1261 /* can not grab this sem since kernel filesys locking documentation
1262 indicates i_mutex may be taken by the kernel on lookup and rename
1263 which could deadlock if we grab the i_mutex here as well */
1264 /* mutex_lock(&direntry->d_inode->i_mutex);*/
1265 /* need to write out dirty pages here */
1266 if (direntry->d_inode->i_mapping) {
1267 /* do we need to lock inode until after invalidate completes
1268 below? */
1269 wbrc = filemap_fdatawrite(direntry->d_inode->i_mapping);
1270 if (wbrc)
1271 CIFS_I(direntry->d_inode)->write_behind_rc = wbrc;
1272 }
1273 if (invalidate_inode) {
1274 /* shrink_dcache not necessary now that cifs dentry ops
1275 are exported for negative dentries */
1276 /* if (S_ISDIR(direntry->d_inode->i_mode))
1277 shrink_dcache_parent(direntry); */
1278 if (S_ISREG(direntry->d_inode->i_mode)) {
1279 if (direntry->d_inode->i_mapping)
1280 wbrc = filemap_fdatawait(direntry->d_inode->i_mapping);
1281 if (wbrc)
1282 CIFS_I(direntry->d_inode)->write_behind_rc = wbrc;
1283 /* may eventually have to do this for open files too */
1284 if (list_empty(&(cifsInode->openFileList))) {
1285 /* changed on server - flush read ahead pages */
1286 cFYI(1, ("Invalidating read ahead data on "
1287 "closed file"));
1288 invalidate_remote_inode(direntry->d_inode);
1289 }
1290 }
1291 }
1292 /* mutex_unlock(&direntry->d_inode->i_mutex); */
1293
1294 kfree(full_path);
1295 FreeXid(xid);
1296 return rc;
1297 }
1298
1299 int cifs_getattr(struct vfsmount *mnt, struct dentry *dentry,
1300 struct kstat *stat)
1301 {
1302 int err = cifs_revalidate(dentry);
1303 if (!err) {
1304 generic_fillattr(dentry->d_inode, stat);
1305 stat->blksize = CIFS_MAX_MSGSIZE;
1306 }
1307 return err;
1308 }
1309
1310 static int cifs_truncate_page(struct address_space *mapping, loff_t from)
1311 {
1312 pgoff_t index = from >> PAGE_CACHE_SHIFT;
1313 unsigned offset = from & (PAGE_CACHE_SIZE - 1);
1314 struct page *page;
1315 int rc = 0;
1316
1317 page = grab_cache_page(mapping, index);
1318 if (!page)
1319 return -ENOMEM;
1320
1321 zero_user_segment(page, offset, PAGE_CACHE_SIZE);
1322 unlock_page(page);
1323 page_cache_release(page);
1324 return rc;
1325 }
1326
1327 static int cifs_vmtruncate(struct inode *inode, loff_t offset)
1328 {
1329 struct address_space *mapping = inode->i_mapping;
1330 unsigned long limit;
1331
1332 spin_lock(&inode->i_lock);
1333 if (inode->i_size < offset)
1334 goto do_expand;
1335 /*
1336 * truncation of in-use swapfiles is disallowed - it would cause
1337 * subsequent swapout to scribble on the now-freed blocks.
1338 */
1339 if (IS_SWAPFILE(inode)) {
1340 spin_unlock(&inode->i_lock);
1341 goto out_busy;
1342 }
1343 i_size_write(inode, offset);
1344 spin_unlock(&inode->i_lock);
1345 /*
1346 * unmap_mapping_range is called twice, first simply for efficiency
1347 * so that truncate_inode_pages does fewer single-page unmaps. However
1348 * after this first call, and before truncate_inode_pages finishes,
1349 * it is possible for private pages to be COWed, which remain after
1350 * truncate_inode_pages finishes, hence the second unmap_mapping_range
1351 * call must be made for correctness.
1352 */
1353 unmap_mapping_range(mapping, offset + PAGE_SIZE - 1, 0, 1);
1354 truncate_inode_pages(mapping, offset);
1355 unmap_mapping_range(mapping, offset + PAGE_SIZE - 1, 0, 1);
1356 goto out_truncate;
1357
1358 do_expand:
1359 limit = current->signal->rlim[RLIMIT_FSIZE].rlim_cur;
1360 if (limit != RLIM_INFINITY && offset > limit) {
1361 spin_unlock(&inode->i_lock);
1362 goto out_sig;
1363 }
1364 if (offset > inode->i_sb->s_maxbytes) {
1365 spin_unlock(&inode->i_lock);
1366 goto out_big;
1367 }
1368 i_size_write(inode, offset);
1369 spin_unlock(&inode->i_lock);
1370 out_truncate:
1371 if (inode->i_op && inode->i_op->truncate)
1372 inode->i_op->truncate(inode);
1373 return 0;
1374 out_sig:
1375 send_sig(SIGXFSZ, current, 0);
1376 out_big:
1377 return -EFBIG;
1378 out_busy:
1379 return -ETXTBSY;
1380 }
1381
1382 int cifs_setattr(struct dentry *direntry, struct iattr *attrs)
1383 {
1384 int xid;
1385 struct cifs_sb_info *cifs_sb;
1386 struct cifsTconInfo *pTcon;
1387 char *full_path = NULL;
1388 int rc = -EACCES;
1389 struct cifsFileInfo *open_file = NULL;
1390 FILE_BASIC_INFO time_buf;
1391 int set_time = FALSE;
1392 int set_dosattr = FALSE;
1393 __u64 mode = 0xFFFFFFFFFFFFFFFFULL;
1394 __u64 uid = 0xFFFFFFFFFFFFFFFFULL;
1395 __u64 gid = 0xFFFFFFFFFFFFFFFFULL;
1396 struct cifsInodeInfo *cifsInode;
1397
1398 xid = GetXid();
1399
1400 cFYI(1, ("setattr on file %s attrs->iavalid 0x%x",
1401 direntry->d_name.name, attrs->ia_valid));
1402
1403 cifs_sb = CIFS_SB(direntry->d_inode->i_sb);
1404 pTcon = cifs_sb->tcon;
1405
1406 if ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_PERM) == 0) {
1407 /* check if we have permission to change attrs */
1408 rc = inode_change_ok(direntry->d_inode, attrs);
1409 if (rc < 0) {
1410 FreeXid(xid);
1411 return rc;
1412 } else
1413 rc = 0;
1414 }
1415
1416 full_path = build_path_from_dentry(direntry);
1417 if (full_path == NULL) {
1418 FreeXid(xid);
1419 return -ENOMEM;
1420 }
1421 cifsInode = CIFS_I(direntry->d_inode);
1422
1423 if ((attrs->ia_valid & ATTR_MTIME) || (attrs->ia_valid & ATTR_SIZE)) {
1424 /*
1425 Flush data before changing file size or changing the last
1426 write time of the file on the server. If the
1427 flush returns error, store it to report later and continue.
1428 BB: This should be smarter. Why bother flushing pages that
1429 will be truncated anyway? Also, should we error out here if
1430 the flush returns error?
1431 */
1432 rc = filemap_write_and_wait(direntry->d_inode->i_mapping);
1433 if (rc != 0) {
1434 CIFS_I(direntry->d_inode)->write_behind_rc = rc;
1435 rc = 0;
1436 }
1437 }
1438
1439 if (attrs->ia_valid & ATTR_SIZE) {
1440 /* To avoid spurious oplock breaks from server, in the case of
1441 inodes that we already have open, avoid doing path based
1442 setting of file size if we can do it by handle.
1443 This keeps our caching token (oplock) and avoids timeouts
1444 when the local oplock break takes longer to flush
1445 writebehind data than the SMB timeout for the SetPathInfo
1446 request would allow */
1447
1448 open_file = find_writable_file(cifsInode);
1449 if (open_file) {
1450 __u16 nfid = open_file->netfid;
1451 __u32 npid = open_file->pid;
1452 rc = CIFSSMBSetFileSize(xid, pTcon, attrs->ia_size,
1453 nfid, npid, FALSE);
1454 atomic_dec(&open_file->wrtPending);
1455 cFYI(1, ("SetFSize for attrs rc = %d", rc));
1456 if ((rc == -EINVAL) || (rc == -EOPNOTSUPP)) {
1457 unsigned int bytes_written;
1458 rc = CIFSSMBWrite(xid, pTcon,
1459 nfid, 0, attrs->ia_size,
1460 &bytes_written, NULL, NULL,
1461 1 /* 45 seconds */);
1462 cFYI(1, ("Wrt seteof rc %d", rc));
1463 }
1464 } else
1465 rc = -EINVAL;
1466
1467 if (rc != 0) {
1468 /* Set file size by pathname rather than by handle
1469 either because no valid, writeable file handle for
1470 it was found or because there was an error setting
1471 it by handle */
1472 rc = CIFSSMBSetEOF(xid, pTcon, full_path,
1473 attrs->ia_size, FALSE,
1474 cifs_sb->local_nls,
1475 cifs_sb->mnt_cifs_flags &
1476 CIFS_MOUNT_MAP_SPECIAL_CHR);
1477 cFYI(1, ("SetEOF by path (setattrs) rc = %d", rc));
1478 if ((rc == -EINVAL) || (rc == -EOPNOTSUPP)) {
1479 __u16 netfid;
1480 int oplock = FALSE;
1481
1482 rc = SMBLegacyOpen(xid, pTcon, full_path,
1483 FILE_OPEN,
1484 SYNCHRONIZE | FILE_WRITE_ATTRIBUTES,
1485 CREATE_NOT_DIR, &netfid, &oplock,
1486 NULL, cifs_sb->local_nls,
1487 cifs_sb->mnt_cifs_flags &
1488 CIFS_MOUNT_MAP_SPECIAL_CHR);
1489 if (rc == 0) {
1490 unsigned int bytes_written;
1491 rc = CIFSSMBWrite(xid, pTcon,
1492 netfid, 0,
1493 attrs->ia_size,
1494 &bytes_written, NULL,
1495 NULL, 1 /* 45 sec */);
1496 cFYI(1, ("wrt seteof rc %d", rc));
1497 CIFSSMBClose(xid, pTcon, netfid);
1498 }
1499
1500 }
1501 }
1502
1503 /* Server is ok setting allocation size implicitly - no need
1504 to call:
1505 CIFSSMBSetEOF(xid, pTcon, full_path, attrs->ia_size, TRUE,
1506 cifs_sb->local_nls);
1507 */
1508
1509 if (rc == 0) {
1510 rc = cifs_vmtruncate(direntry->d_inode, attrs->ia_size);
1511 cifs_truncate_page(direntry->d_inode->i_mapping,
1512 direntry->d_inode->i_size);
1513 } else
1514 goto cifs_setattr_exit;
1515 }
1516 if (attrs->ia_valid & ATTR_UID) {
1517 cFYI(1, ("UID changed to %d", attrs->ia_uid));
1518 uid = attrs->ia_uid;
1519 }
1520 if (attrs->ia_valid & ATTR_GID) {
1521 cFYI(1, ("GID changed to %d", attrs->ia_gid));
1522 gid = attrs->ia_gid;
1523 }
1524
1525 time_buf.Attributes = 0;
1526
1527 /* skip mode change if it's just for clearing setuid/setgid */
1528 if (attrs->ia_valid & (ATTR_KILL_SUID|ATTR_KILL_SGID))
1529 attrs->ia_valid &= ~ATTR_MODE;
1530
1531 if (attrs->ia_valid & ATTR_MODE) {
1532 cFYI(1, ("Mode changed to 0x%x", attrs->ia_mode));
1533 mode = attrs->ia_mode;
1534 }
1535
1536 if ((pTcon->unix_ext)
1537 && (attrs->ia_valid & (ATTR_MODE | ATTR_GID | ATTR_UID)))
1538 rc = CIFSSMBUnixSetPerms(xid, pTcon, full_path, mode, uid, gid,
1539 0 /* dev_t */, cifs_sb->local_nls,
1540 cifs_sb->mnt_cifs_flags &
1541 CIFS_MOUNT_MAP_SPECIAL_CHR);
1542 else if (attrs->ia_valid & ATTR_MODE) {
1543 rc = 0;
1544 #ifdef CONFIG_CIFS_EXPERIMENTAL
1545 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_CIFS_ACL)
1546 rc = mode_to_acl(direntry->d_inode, full_path, mode);
1547 else if ((mode & S_IWUGO) == 0) {
1548 #else
1549 if ((mode & S_IWUGO) == 0) {
1550 #endif
1551 /* not writeable */
1552 if ((cifsInode->cifsAttrs & ATTR_READONLY) == 0) {
1553 set_dosattr = TRUE;
1554 time_buf.Attributes =
1555 cpu_to_le32(cifsInode->cifsAttrs |
1556 ATTR_READONLY);
1557 }
1558 } else if (cifsInode->cifsAttrs & ATTR_READONLY) {
1559 /* If file is readonly on server, we would
1560 not be able to write to it - so if any write
1561 bit is enabled for user or group or other we
1562 need to at least try to remove r/o dos attr */
1563 set_dosattr = TRUE;
1564 time_buf.Attributes = cpu_to_le32(cifsInode->cifsAttrs &
1565 (~ATTR_READONLY));
1566 /* Windows ignores set to zero */
1567 if (time_buf.Attributes == 0)
1568 time_buf.Attributes |= cpu_to_le32(ATTR_NORMAL);
1569 }
1570 #ifdef CONFIG_CIFS_EXPERIMENTAL
1571 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_CIFS_ACL)
1572 mode_to_acl(direntry->d_inode, full_path, mode);
1573 #endif
1574 }
1575
1576 if (attrs->ia_valid & ATTR_ATIME) {
1577 set_time = TRUE;
1578 time_buf.LastAccessTime =
1579 cpu_to_le64(cifs_UnixTimeToNT(attrs->ia_atime));
1580 } else
1581 time_buf.LastAccessTime = 0;
1582
1583 if (attrs->ia_valid & ATTR_MTIME) {
1584 set_time = TRUE;
1585 time_buf.LastWriteTime =
1586 cpu_to_le64(cifs_UnixTimeToNT(attrs->ia_mtime));
1587 } else
1588 time_buf.LastWriteTime = 0;
1589 /* Do not set ctime explicitly unless other time
1590 stamps are changed explicitly (i.e. by utime()
1591 since we would then have a mix of client and
1592 server times */
1593
1594 if (set_time && (attrs->ia_valid & ATTR_CTIME)) {
1595 set_time = TRUE;
1596 /* Although Samba throws this field away
1597 it may be useful to Windows - but we do
1598 not want to set ctime unless some other
1599 timestamp is changing */
1600 cFYI(1, ("CIFS - CTIME changed"));
1601 time_buf.ChangeTime =
1602 cpu_to_le64(cifs_UnixTimeToNT(attrs->ia_ctime));
1603 } else
1604 time_buf.ChangeTime = 0;
1605
1606 if (set_time || set_dosattr) {
1607 time_buf.CreationTime = 0; /* do not change */
1608 /* In the future we should experiment - try setting timestamps
1609 via Handle (SetFileInfo) instead of by path */
1610 if (!(pTcon->ses->flags & CIFS_SES_NT4))
1611 rc = CIFSSMBSetTimes(xid, pTcon, full_path, &time_buf,
1612 cifs_sb->local_nls,
1613 cifs_sb->mnt_cifs_flags &
1614 CIFS_MOUNT_MAP_SPECIAL_CHR);
1615 else
1616 rc = -EOPNOTSUPP;
1617
1618 if (rc == -EOPNOTSUPP) {
1619 int oplock = FALSE;
1620 __u16 netfid;
1621
1622 cFYI(1, ("calling SetFileInfo since SetPathInfo for "
1623 "times not supported by this server"));
1624 /* BB we could scan to see if we already have it open
1625 and pass in pid of opener to function */
1626 rc = CIFSSMBOpen(xid, pTcon, full_path, FILE_OPEN,
1627 SYNCHRONIZE | FILE_WRITE_ATTRIBUTES,
1628 CREATE_NOT_DIR, &netfid, &oplock,
1629 NULL, cifs_sb->local_nls,
1630 cifs_sb->mnt_cifs_flags &
1631 CIFS_MOUNT_MAP_SPECIAL_CHR);
1632 if (rc == 0) {
1633 rc = CIFSSMBSetFileTimes(xid, pTcon, &time_buf,
1634 netfid);
1635 CIFSSMBClose(xid, pTcon, netfid);
1636 } else {
1637 /* BB For even older servers we could convert time_buf
1638 into old DOS style which uses two second
1639 granularity */
1640
1641 /* rc = CIFSSMBSetTimesLegacy(xid, pTcon, full_path,
1642 &time_buf, cifs_sb->local_nls); */
1643 }
1644 }
1645 /* Even if error on time set, no sense failing the call if
1646 the server would set the time to a reasonable value anyway,
1647 and this check ensures that we are not being called from
1648 sys_utimes in which case we ought to fail the call back to
1649 the user when the server rejects the call */
1650 if ((rc) && (attrs->ia_valid &
1651 (ATTR_MODE | ATTR_GID | ATTR_UID | ATTR_SIZE)))
1652 rc = 0;
1653 }
1654
1655 /* do not need local check to inode_check_ok since the server does
1656 that */
1657 if (!rc)
1658 rc = inode_setattr(direntry->d_inode, attrs);
1659 cifs_setattr_exit:
1660 kfree(full_path);
1661 FreeXid(xid);
1662 return rc;
1663 }
1664
1665 #if 0
1666 void cifs_delete_inode(struct inode *inode)
1667 {
1668 cFYI(1, ("In cifs_delete_inode, inode = 0x%p", inode));
1669 /* may have to add back in if and when safe distributed caching of
1670 directories added e.g. via FindNotify */
1671 }
1672 #endif
Linux 2.6 libata-dev (mirror)