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[CIFS] remove two sparse warnings
[linux-2.6/libata-dev.git] / fs / cifs / inode.c
blobece17ca00d0847270bdf3af2e87f1a72c3b96c41
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 int cifs_get_inode_info_unix(struct inode **pinode,
33 const unsigned char *search_path, struct super_block *sb, int xid)
34 {
35 int rc = 0;
36 FILE_UNIX_BASIC_INFO findData;
37 struct cifsTconInfo *pTcon;
38 struct inode *inode;
39 struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
40 char *tmp_path;
41
42 pTcon = cifs_sb->tcon;
43 cFYI(1, ("Getting info on %s", search_path));
44 /* could have done a find first instead but this returns more info */
45 rc = CIFSSMBUnixQPathInfo(xid, pTcon, search_path, &findData,
46 cifs_sb->local_nls, cifs_sb->mnt_cifs_flags &
47 CIFS_MOUNT_MAP_SPECIAL_CHR);
48 /* dump_mem("\nUnixQPathInfo return data", &findData,
49 sizeof(findData)); */
50 if (rc) {
51 if (rc == -EREMOTE) {
52 tmp_path =
53 kmalloc(strnlen(pTcon->treeName,
54 MAX_TREE_SIZE + 1) +
55 strnlen(search_path, MAX_PATHCONF) + 1,
56 GFP_KERNEL);
57 if (tmp_path == NULL) {
58 return -ENOMEM;
59 }
60 /* have to skip first of the double backslash of
61 UNC name */
62 strncpy(tmp_path, pTcon->treeName, MAX_TREE_SIZE);
63 strncat(tmp_path, search_path, MAX_PATHCONF);
64 rc = connect_to_dfs_path(xid, pTcon->ses,
65 /* treename + */ tmp_path,
66 cifs_sb->local_nls,
67 cifs_sb->mnt_cifs_flags &
68 CIFS_MOUNT_MAP_SPECIAL_CHR);
69 kfree(tmp_path);
70
71 /* BB fix up inode etc. */
72 } else if (rc) {
73 return rc;
74 }
75 } else {
76 struct cifsInodeInfo *cifsInfo;
77 __u32 type = le32_to_cpu(findData.Type);
78 __u64 num_of_bytes = le64_to_cpu(findData.NumOfBytes);
79 __u64 end_of_file = le64_to_cpu(findData.EndOfFile);
80
81 /* get new inode */
82 if (*pinode == NULL) {
83 *pinode = new_inode(sb);
84 if (*pinode == NULL)
85 return -ENOMEM;
86 /* Is an i_ino of zero legal? */
87 /* Are there sanity checks we can use to ensure that
88 the server is really filling in that field? */
89 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM) {
90 (*pinode)->i_ino =
91 (unsigned long)findData.UniqueId;
92 } /* note ino incremented to unique num in new_inode */
93 if (sb->s_flags & MS_NOATIME)
94 (*pinode)->i_flags |= S_NOATIME | S_NOCMTIME;
95
96 insert_inode_hash(*pinode);
97 }
98
99 inode = *pinode;
100 cifsInfo = CIFS_I(inode);
101
102 cFYI(1, ("Old time %ld", cifsInfo->time));
103 cifsInfo->time = jiffies;
104 cFYI(1, ("New time %ld", cifsInfo->time));
105 /* this is ok to set on every inode revalidate */
106 atomic_set(&cifsInfo->inUse, 1);
107
108 inode->i_atime =
109 cifs_NTtimeToUnix(le64_to_cpu(findData.LastAccessTime));
110 inode->i_mtime =
111 cifs_NTtimeToUnix(le64_to_cpu
112 (findData.LastModificationTime));
113 inode->i_ctime =
114 cifs_NTtimeToUnix(le64_to_cpu(findData.LastStatusChange));
115 inode->i_mode = le64_to_cpu(findData.Permissions);
116 /* since we set the inode type below we need to mask off
117 to avoid strange results if bits set above */
118 inode->i_mode &= ~S_IFMT;
119 if (type == UNIX_FILE) {
120 inode->i_mode |= S_IFREG;
121 } else if (type == UNIX_SYMLINK) {
122 inode->i_mode |= S_IFLNK;
123 } else if (type == UNIX_DIR) {
124 inode->i_mode |= S_IFDIR;
125 } else if (type == UNIX_CHARDEV) {
126 inode->i_mode |= S_IFCHR;
127 inode->i_rdev = MKDEV(le64_to_cpu(findData.DevMajor),
128 le64_to_cpu(findData.DevMinor) & MINORMASK);
129 } else if (type == UNIX_BLOCKDEV) {
130 inode->i_mode |= S_IFBLK;
131 inode->i_rdev = MKDEV(le64_to_cpu(findData.DevMajor),
132 le64_to_cpu(findData.DevMinor) & MINORMASK);
133 } else if (type == UNIX_FIFO) {
134 inode->i_mode |= S_IFIFO;
135 } else if (type == UNIX_SOCKET) {
136 inode->i_mode |= S_IFSOCK;
137 } else {
138 /* safest to call it a file if we do not know */
139 inode->i_mode |= S_IFREG;
140 cFYI(1, ("unknown type %d", type));
141 }
142
143 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_OVERR_UID)
144 inode->i_uid = cifs_sb->mnt_uid;
145 else
146 inode->i_uid = le64_to_cpu(findData.Uid);
147
148 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_OVERR_GID)
149 inode->i_gid = cifs_sb->mnt_gid;
150 else
151 inode->i_gid = le64_to_cpu(findData.Gid);
152
153 inode->i_nlink = le64_to_cpu(findData.Nlinks);
154
155 spin_lock(&inode->i_lock);
156 if (is_size_safe_to_change(cifsInfo, end_of_file)) {
157 /* can not safely change the file size here if the
158 client is writing to it due to potential races */
159 i_size_write(inode, end_of_file);
160
161 /* blksize needs to be multiple of two. So safer to default to
162 blksize and blkbits set in superblock so 2**blkbits and blksize
163 will match rather than setting to:
164 (pTcon->ses->server->maxBuf - MAX_CIFS_HDR_SIZE) & 0xFFFFFE00;*/
165
166 /* This seems incredibly stupid but it turns out that i_blocks
167 is not related to (i_size / i_blksize), instead 512 byte size
168 is required for calculating num blocks */
169
170 /* 512 bytes (2**9) is the fake blocksize that must be used */
171 /* for this calculation */
172 inode->i_blocks = (512 - 1 + num_of_bytes) >> 9;
173 }
174 spin_unlock(&inode->i_lock);
175
176 if (num_of_bytes < end_of_file)
177 cFYI(1, ("allocation size less than end of file"));
178 cFYI(1, ("Size %ld and blocks %llu",
179 (unsigned long) inode->i_size,
180 (unsigned long long)inode->i_blocks));
181 if (S_ISREG(inode->i_mode)) {
182 cFYI(1, ("File inode"));
183 inode->i_op = &cifs_file_inode_ops;
184 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DIRECT_IO) {
185 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_BRL)
186 inode->i_fop =
187 &cifs_file_direct_nobrl_ops;
188 else
189 inode->i_fop = &cifs_file_direct_ops;
190 } else if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_BRL)
191 inode->i_fop = &cifs_file_nobrl_ops;
192 else /* not direct, send byte range locks */
193 inode->i_fop = &cifs_file_ops;
194
195 /* check if server can support readpages */
196 if (pTcon->ses->server->maxBuf <
197 PAGE_CACHE_SIZE + MAX_CIFS_HDR_SIZE)
198 inode->i_data.a_ops = &cifs_addr_ops_smallbuf;
199 else
200 inode->i_data.a_ops = &cifs_addr_ops;
201 } else if (S_ISDIR(inode->i_mode)) {
202 cFYI(1, ("Directory inode"));
203 inode->i_op = &cifs_dir_inode_ops;
204 inode->i_fop = &cifs_dir_ops;
205 } else if (S_ISLNK(inode->i_mode)) {
206 cFYI(1, ("Symbolic Link inode"));
207 inode->i_op = &cifs_symlink_inode_ops;
208 /* tmp_inode->i_fop = */ /* do not need to set to anything */
209 } else {
210 cFYI(1, ("Init special inode"));
211 init_special_inode(inode, inode->i_mode,
212 inode->i_rdev);
213 }
214 }
215 return rc;
216 }
217
218 static int decode_sfu_inode(struct inode *inode, __u64 size,
219 const unsigned char *path,
220 struct cifs_sb_info *cifs_sb, int xid)
221 {
222 int rc;
223 int oplock = FALSE;
224 __u16 netfid;
225 struct cifsTconInfo *pTcon = cifs_sb->tcon;
226 char buf[24];
227 unsigned int bytes_read;
228 char *pbuf;
229
230 pbuf = buf;
231
232 if (size == 0) {
233 inode->i_mode |= S_IFIFO;
234 return 0;
235 } else if (size < 8) {
236 return -EINVAL; /* EOPNOTSUPP? */
237 }
238
239 rc = CIFSSMBOpen(xid, pTcon, path, FILE_OPEN, GENERIC_READ,
240 CREATE_NOT_DIR, &netfid, &oplock, NULL,
241 cifs_sb->local_nls,
242 cifs_sb->mnt_cifs_flags &
243 CIFS_MOUNT_MAP_SPECIAL_CHR);
244 if (rc == 0) {
245 int buf_type = CIFS_NO_BUFFER;
246 /* Read header */
247 rc = CIFSSMBRead(xid, pTcon,
248 netfid,
249 24 /* length */, 0 /* offset */,
250 &bytes_read, &pbuf, &buf_type);
251 if ((rc == 0) && (bytes_read >= 8)) {
252 if (memcmp("IntxBLK", pbuf, 8) == 0) {
253 cFYI(1, ("Block device"));
254 inode->i_mode |= S_IFBLK;
255 if (bytes_read == 24) {
256 /* we have enough to decode dev num */
257 __u64 mjr; /* major */
258 __u64 mnr; /* minor */
259 mjr = le64_to_cpu(*(__le64 *)(pbuf+8));
260 mnr = le64_to_cpu(*(__le64 *)(pbuf+16));
261 inode->i_rdev = MKDEV(mjr, mnr);
262 }
263 } else if (memcmp("IntxCHR", pbuf, 8) == 0) {
264 cFYI(1, ("Char device"));
265 inode->i_mode |= S_IFCHR;
266 if (bytes_read == 24) {
267 /* we have enough to decode dev num */
268 __u64 mjr; /* major */
269 __u64 mnr; /* minor */
270 mjr = le64_to_cpu(*(__le64 *)(pbuf+8));
271 mnr = le64_to_cpu(*(__le64 *)(pbuf+16));
272 inode->i_rdev = MKDEV(mjr, mnr);
273 }
274 } else if (memcmp("IntxLNK", pbuf, 7) == 0) {
275 cFYI(1, ("Symlink"));
276 inode->i_mode |= S_IFLNK;
277 } else {
278 inode->i_mode |= S_IFREG; /* file? */
279 rc = -EOPNOTSUPP;
280 }
281 } else {
282 inode->i_mode |= S_IFREG; /* then it is a file */
283 rc = -EOPNOTSUPP; /* or some unknown SFU type */
284 }
285 CIFSSMBClose(xid, pTcon, netfid);
286 }
287 return rc;
288 }
289
290 #define SFBITS_MASK (S_ISVTX | S_ISGID | S_ISUID) /* SETFILEBITS valid bits */
291
292 static int get_sfu_uid_mode(struct inode *inode,
293 const unsigned char *path,
294 struct cifs_sb_info *cifs_sb, int xid)
295 {
296 #ifdef CONFIG_CIFS_XATTR
297 ssize_t rc;
298 char ea_value[4];
299 __u32 mode;
300
301 rc = CIFSSMBQueryEA(xid, cifs_sb->tcon, path, "SETFILEBITS",
302 ea_value, 4 /* size of buf */, cifs_sb->local_nls,
303 cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR);
304 if (rc < 0)
305 return (int)rc;
306 else if (rc > 3) {
307 mode = le32_to_cpu(*((__le32 *)ea_value));
308 inode->i_mode &= ~SFBITS_MASK;
309 cFYI(1, ("special bits 0%o org mode 0%o", mode, inode->i_mode));
310 inode->i_mode = (mode & SFBITS_MASK) | inode->i_mode;
311 cFYI(1, ("special mode bits 0%o", mode));
312 return 0;
313 } else {
314 return 0;
315 }
316 #else
317 return -EOPNOTSUPP;
318 #endif
319 }
320
321 int cifs_get_inode_info(struct inode **pinode,
322 const unsigned char *search_path, FILE_ALL_INFO *pfindData,
323 struct super_block *sb, int xid)
324 {
325 int rc = 0;
326 struct cifsTconInfo *pTcon;
327 struct inode *inode;
328 struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
329 char *tmp_path;
330 char *buf = NULL;
331 int adjustTZ = FALSE;
332
333 pTcon = cifs_sb->tcon;
334 cFYI(1, ("Getting info on %s", search_path));
335
336 if ((pfindData == NULL) && (*pinode != NULL)) {
337 if (CIFS_I(*pinode)->clientCanCacheRead) {
338 cFYI(1, ("No need to revalidate cached inode sizes"));
339 return rc;
340 }
341 }
342
343 /* if file info not passed in then get it from server */
344 if (pfindData == NULL) {
345 buf = kmalloc(sizeof(FILE_ALL_INFO), GFP_KERNEL);
346 if (buf == NULL)
347 return -ENOMEM;
348 pfindData = (FILE_ALL_INFO *)buf;
349 /* could do find first instead but this returns more info */
350 rc = CIFSSMBQPathInfo(xid, pTcon, search_path, pfindData,
351 0 /* not legacy */,
352 cifs_sb->local_nls, cifs_sb->mnt_cifs_flags &
353 CIFS_MOUNT_MAP_SPECIAL_CHR);
354 /* BB optimize code so we do not make the above call
355 when server claims no NT SMB support and the above call
356 failed at least once - set flag in tcon or mount */
357 if ((rc == -EOPNOTSUPP) || (rc == -EINVAL)) {
358 rc = SMBQueryInformation(xid, pTcon, search_path,
359 pfindData, cifs_sb->local_nls,
360 cifs_sb->mnt_cifs_flags &
361 CIFS_MOUNT_MAP_SPECIAL_CHR);
362 adjustTZ = TRUE;
363 }
364 }
365 /* dump_mem("\nQPathInfo return data",&findData, sizeof(findData)); */
366 if (rc) {
367 if (rc == -EREMOTE) {
368 tmp_path =
369 kmalloc(strnlen
370 (pTcon->treeName,
371 MAX_TREE_SIZE + 1) +
372 strnlen(search_path, MAX_PATHCONF) + 1,
373 GFP_KERNEL);
374 if (tmp_path == NULL) {
375 kfree(buf);
376 return -ENOMEM;
377 }
378
379 strncpy(tmp_path, pTcon->treeName, MAX_TREE_SIZE);
380 strncat(tmp_path, search_path, MAX_PATHCONF);
381 rc = connect_to_dfs_path(xid, pTcon->ses,
382 /* treename + */ tmp_path,
383 cifs_sb->local_nls,
384 cifs_sb->mnt_cifs_flags &
385 CIFS_MOUNT_MAP_SPECIAL_CHR);
386 kfree(tmp_path);
387 /* BB fix up inode etc. */
388 } else if (rc) {
389 kfree(buf);
390 return rc;
391 }
392 } else {
393 struct cifsInodeInfo *cifsInfo;
394 __u32 attr = le32_to_cpu(pfindData->Attributes);
395
396 /* get new inode */
397 if (*pinode == NULL) {
398 *pinode = new_inode(sb);
399 if (*pinode == NULL) {
400 kfree(buf);
401 return -ENOMEM;
402 }
403 /* Is an i_ino of zero legal? Can we use that to check
404 if the server supports returning inode numbers? Are
405 there other sanity checks we can use to ensure that
406 the server is really filling in that field? */
407
408 /* We can not use the IndexNumber field by default from
409 Windows or Samba (in ALL_INFO buf) but we can request
410 it explicitly. It may not be unique presumably if
411 the server has multiple devices mounted under one
412 share */
413
414 /* There may be higher info levels that work but are
415 there Windows server or network appliances for which
416 IndexNumber field is not guaranteed unique? */
417
418 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM) {
419 int rc1 = 0;
420 __u64 inode_num;
421
422 rc1 = CIFSGetSrvInodeNumber(xid, pTcon,
423 search_path, &inode_num,
424 cifs_sb->local_nls,
425 cifs_sb->mnt_cifs_flags &
426 CIFS_MOUNT_MAP_SPECIAL_CHR);
427 if (rc1) {
428 cFYI(1, ("GetSrvInodeNum rc %d", rc1));
429 /* BB EOPNOSUPP disable SERVER_INUM? */
430 } else /* do we need cast or hash to ino? */
431 (*pinode)->i_ino = inode_num;
432 } /* else ino incremented to unique num in new_inode*/
433 if (sb->s_flags & MS_NOATIME)
434 (*pinode)->i_flags |= S_NOATIME | S_NOCMTIME;
435 insert_inode_hash(*pinode);
436 }
437 inode = *pinode;
438 cifsInfo = CIFS_I(inode);
439 cifsInfo->cifsAttrs = attr;
440 cFYI(1, ("Old time %ld", cifsInfo->time));
441 cifsInfo->time = jiffies;
442 cFYI(1, ("New time %ld", cifsInfo->time));
443
444 /* blksize needs to be multiple of two. So safer to default to
445 blksize and blkbits set in superblock so 2**blkbits and blksize
446 will match rather than setting to:
447 (pTcon->ses->server->maxBuf - MAX_CIFS_HDR_SIZE) & 0xFFFFFE00;*/
448
449 /* Linux can not store file creation time so ignore it */
450 if (pfindData->LastAccessTime)
451 inode->i_atime = cifs_NTtimeToUnix
452 (le64_to_cpu(pfindData->LastAccessTime));
453 else /* do not need to use current_fs_time - time not stored */
454 inode->i_atime = CURRENT_TIME;
455 inode->i_mtime =
456 cifs_NTtimeToUnix(le64_to_cpu(pfindData->LastWriteTime));
457 inode->i_ctime =
458 cifs_NTtimeToUnix(le64_to_cpu(pfindData->ChangeTime));
459 cFYI(0, ("Attributes came in as 0x%x", attr));
460 if (adjustTZ && (pTcon->ses) && (pTcon->ses->server)) {
461 inode->i_ctime.tv_sec += pTcon->ses->server->timeAdj;
462 inode->i_mtime.tv_sec += pTcon->ses->server->timeAdj;
463 }
464
465 /* set default mode. will override for dirs below */
466 if (atomic_read(&cifsInfo->inUse) == 0)
467 /* new inode, can safely set these fields */
468 inode->i_mode = cifs_sb->mnt_file_mode;
469 else /* since we set the inode type below we need to mask off
470 to avoid strange results if type changes and both
471 get orred in */
472 inode->i_mode &= ~S_IFMT;
473 /* if (attr & ATTR_REPARSE) */
474 /* We no longer handle these as symlinks because we could not
475 follow them due to the absolute path with drive letter */
476 if (attr & ATTR_DIRECTORY) {
477 /* override default perms since we do not do byte range locking
478 on dirs */
479 inode->i_mode = cifs_sb->mnt_dir_mode;
480 inode->i_mode |= S_IFDIR;
481 } else if ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_UNX_EMUL) &&
482 (cifsInfo->cifsAttrs & ATTR_SYSTEM) &&
483 /* No need to le64 convert size of zero */
484 (pfindData->EndOfFile == 0)) {
485 inode->i_mode = cifs_sb->mnt_file_mode;
486 inode->i_mode |= S_IFIFO;
487 /* BB Finish for SFU style symlinks and devices */
488 } else if ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_UNX_EMUL) &&
489 (cifsInfo->cifsAttrs & ATTR_SYSTEM)) {
490 if (decode_sfu_inode(inode,
491 le64_to_cpu(pfindData->EndOfFile),
492 search_path,
493 cifs_sb, xid)) {
494 cFYI(1, ("Unrecognized sfu inode type"));
495 }
496 cFYI(1, ("sfu mode 0%o", inode->i_mode));
497 } else {
498 inode->i_mode |= S_IFREG;
499 /* treat the dos attribute of read-only as read-only
500 mode e.g. 555 */
501 if (cifsInfo->cifsAttrs & ATTR_READONLY)
502 inode->i_mode &= ~(S_IWUGO);
503 else if ((inode->i_mode & S_IWUGO) == 0)
504 /* the ATTR_READONLY flag may have been */
505 /* changed on server -- set any w bits */
506 /* allowed by mnt_file_mode */
507 inode->i_mode |= (S_IWUGO &
508 cifs_sb->mnt_file_mode);
509 /* BB add code here -
510 validate if device or weird share or device type? */
511 }
512
513 spin_lock(&inode->i_lock);
514 if (is_size_safe_to_change(cifsInfo, le64_to_cpu(pfindData->EndOfFile))) {
515 /* can not safely shrink the file size here if the
516 client is writing to it due to potential races */
517 i_size_write(inode, le64_to_cpu(pfindData->EndOfFile));
518
519 /* 512 bytes (2**9) is the fake blocksize that must be
520 used for this calculation */
521 inode->i_blocks = (512 - 1 + le64_to_cpu(
522 pfindData->AllocationSize)) >> 9;
523 }
524 spin_unlock(&inode->i_lock);
525
526 inode->i_nlink = le32_to_cpu(pfindData->NumberOfLinks);
527
528 /* BB fill in uid and gid here? with help from winbind?
529 or retrieve from NTFS stream extended attribute */
530 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_UNX_EMUL) {
531 /* fill in uid, gid, mode from server ACL */
532 /* BB FIXME this should also take into account the
533 * default uid specified on mount if present */
534 get_sfu_uid_mode(inode, search_path, cifs_sb, xid);
535 } else if (atomic_read(&cifsInfo->inUse) == 0) {
536 inode->i_uid = cifs_sb->mnt_uid;
537 inode->i_gid = cifs_sb->mnt_gid;
538 /* set so we do not keep refreshing these fields with
539 bad data after user has changed them in memory */
540 atomic_set(&cifsInfo->inUse, 1);
541 }
542
543 if (S_ISREG(inode->i_mode)) {
544 cFYI(1, ("File inode"));
545 inode->i_op = &cifs_file_inode_ops;
546 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DIRECT_IO) {
547 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_BRL)
548 inode->i_fop =
549 &cifs_file_direct_nobrl_ops;
550 else
551 inode->i_fop = &cifs_file_direct_ops;
552 } else if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_BRL)
553 inode->i_fop = &cifs_file_nobrl_ops;
554 else /* not direct, send byte range locks */
555 inode->i_fop = &cifs_file_ops;
556
557 if (pTcon->ses->server->maxBuf <
558 PAGE_CACHE_SIZE + MAX_CIFS_HDR_SIZE)
559 inode->i_data.a_ops = &cifs_addr_ops_smallbuf;
560 else
561 inode->i_data.a_ops = &cifs_addr_ops;
562 } else if (S_ISDIR(inode->i_mode)) {
563 cFYI(1, ("Directory inode"));
564 inode->i_op = &cifs_dir_inode_ops;
565 inode->i_fop = &cifs_dir_ops;
566 } else if (S_ISLNK(inode->i_mode)) {
567 cFYI(1, ("Symbolic Link inode"));
568 inode->i_op = &cifs_symlink_inode_ops;
569 } else {
570 init_special_inode(inode, inode->i_mode,
571 inode->i_rdev);
572 }
573 }
574 kfree(buf);
575 return rc;
576 }
577
578 static const struct inode_operations cifs_ipc_inode_ops = {
579 .lookup = cifs_lookup,
580 };
581
582 /* gets root inode */
583 void cifs_read_inode(struct inode *inode)
584 {
585 int xid, rc;
586 struct cifs_sb_info *cifs_sb;
587
588 cifs_sb = CIFS_SB(inode->i_sb);
589 xid = GetXid();
590
591 if (cifs_sb->tcon->unix_ext)
592 rc = cifs_get_inode_info_unix(&inode, "", inode->i_sb, xid);
593 else
594 rc = cifs_get_inode_info(&inode, "", NULL, inode->i_sb, xid);
595 if (rc && cifs_sb->tcon->ipc) {
596 cFYI(1, ("ipc connection - fake read inode"));
597 inode->i_mode |= S_IFDIR;
598 inode->i_nlink = 2;
599 inode->i_op = &cifs_ipc_inode_ops;
600 inode->i_fop = &simple_dir_operations;
601 inode->i_uid = cifs_sb->mnt_uid;
602 inode->i_gid = cifs_sb->mnt_gid;
603 }
604
605 /* can not call macro FreeXid here since in a void func */
606 _FreeXid(xid);
607 }
608
609 int cifs_unlink(struct inode *inode, struct dentry *direntry)
610 {
611 int rc = 0;
612 int xid;
613 struct cifs_sb_info *cifs_sb;
614 struct cifsTconInfo *pTcon;
615 char *full_path = NULL;
616 struct cifsInodeInfo *cifsInode;
617 FILE_BASIC_INFO *pinfo_buf;
618
619 cFYI(1, ("cifs_unlink, inode = 0x%p", inode));
620
621 xid = GetXid();
622
623 if (inode)
624 cifs_sb = CIFS_SB(inode->i_sb);
625 else
626 cifs_sb = CIFS_SB(direntry->d_sb);
627 pTcon = cifs_sb->tcon;
628
629 /* Unlink can be called from rename so we can not grab the sem here
630 since we deadlock otherwise */
631 /* mutex_lock(&direntry->d_sb->s_vfs_rename_mutex);*/
632 full_path = build_path_from_dentry(direntry);
633 /* mutex_unlock(&direntry->d_sb->s_vfs_rename_mutex);*/
634 if (full_path == NULL) {
635 FreeXid(xid);
636 return -ENOMEM;
637 }
638
639 if ((pTcon->ses->capabilities & CAP_UNIX) &&
640 (CIFS_UNIX_POSIX_PATH_OPS_CAP &
641 le64_to_cpu(pTcon->fsUnixInfo.Capability))) {
642 rc = CIFSPOSIXDelFile(xid, pTcon, full_path,
643 SMB_POSIX_UNLINK_FILE_TARGET, cifs_sb->local_nls,
644 cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR);
645 cFYI(1, ("posix del rc %d", rc));
646 if ((rc == 0) || (rc == -ENOENT))
647 goto psx_del_no_retry;
648 }
649
650 rc = CIFSSMBDelFile(xid, pTcon, full_path, cifs_sb->local_nls,
651 cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR);
652 psx_del_no_retry:
653 if (!rc) {
654 if (direntry->d_inode)
655 drop_nlink(direntry->d_inode);
656 } else if (rc == -ENOENT) {
657 d_drop(direntry);
658 } else if (rc == -ETXTBSY) {
659 int oplock = FALSE;
660 __u16 netfid;
661
662 rc = CIFSSMBOpen(xid, pTcon, full_path, FILE_OPEN, DELETE,
663 CREATE_NOT_DIR | CREATE_DELETE_ON_CLOSE,
664 &netfid, &oplock, NULL, cifs_sb->local_nls,
665 cifs_sb->mnt_cifs_flags &
666 CIFS_MOUNT_MAP_SPECIAL_CHR);
667 if (rc == 0) {
668 CIFSSMBRenameOpenFile(xid, pTcon, netfid, NULL,
669 cifs_sb->local_nls,
670 cifs_sb->mnt_cifs_flags &
671 CIFS_MOUNT_MAP_SPECIAL_CHR);
672 CIFSSMBClose(xid, pTcon, netfid);
673 if (direntry->d_inode)
674 drop_nlink(direntry->d_inode);
675 }
676 } else if (rc == -EACCES) {
677 /* try only if r/o attribute set in local lookup data? */
678 pinfo_buf = kzalloc(sizeof(FILE_BASIC_INFO), GFP_KERNEL);
679 if (pinfo_buf) {
680 /* ATTRS set to normal clears r/o bit */
681 pinfo_buf->Attributes = cpu_to_le32(ATTR_NORMAL);
682 if (!(pTcon->ses->flags & CIFS_SES_NT4))
683 rc = CIFSSMBSetTimes(xid, pTcon, full_path,
684 pinfo_buf,
685 cifs_sb->local_nls,
686 cifs_sb->mnt_cifs_flags &
687 CIFS_MOUNT_MAP_SPECIAL_CHR);
688 else
689 rc = -EOPNOTSUPP;
690
691 if (rc == -EOPNOTSUPP) {
692 int oplock = FALSE;
693 __u16 netfid;
694 /* rc = CIFSSMBSetAttrLegacy(xid, pTcon,
695 full_path,
696 (__u16)ATTR_NORMAL,
697 cifs_sb->local_nls);
698 For some strange reason it seems that NT4 eats the
699 old setattr call without actually setting the
700 attributes so on to the third attempted workaround
701 */
702
703 /* BB could scan to see if we already have it open
704 and pass in pid of opener to function */
705 rc = CIFSSMBOpen(xid, pTcon, full_path,
706 FILE_OPEN, SYNCHRONIZE |
707 FILE_WRITE_ATTRIBUTES, 0,
708 &netfid, &oplock, NULL,
709 cifs_sb->local_nls,
710 cifs_sb->mnt_cifs_flags &
711 CIFS_MOUNT_MAP_SPECIAL_CHR);
712 if (rc == 0) {
713 rc = CIFSSMBSetFileTimes(xid, pTcon,
714 pinfo_buf,
715 netfid);
716 CIFSSMBClose(xid, pTcon, netfid);
717 }
718 }
719 kfree(pinfo_buf);
720 }
721 if (rc == 0) {
722 rc = CIFSSMBDelFile(xid, pTcon, full_path,
723 cifs_sb->local_nls,
724 cifs_sb->mnt_cifs_flags &
725 CIFS_MOUNT_MAP_SPECIAL_CHR);
726 if (!rc) {
727 if (direntry->d_inode)
728 drop_nlink(direntry->d_inode);
729 } else if (rc == -ETXTBSY) {
730 int oplock = FALSE;
731 __u16 netfid;
732
733 rc = CIFSSMBOpen(xid, pTcon, full_path,
734 FILE_OPEN, DELETE,
735 CREATE_NOT_DIR |
736 CREATE_DELETE_ON_CLOSE,
737 &netfid, &oplock, NULL,
738 cifs_sb->local_nls,
739 cifs_sb->mnt_cifs_flags &
740 CIFS_MOUNT_MAP_SPECIAL_CHR);
741 if (rc == 0) {
742 CIFSSMBRenameOpenFile(xid, pTcon,
743 netfid, NULL,
744 cifs_sb->local_nls,
745 cifs_sb->mnt_cifs_flags &
746 CIFS_MOUNT_MAP_SPECIAL_CHR);
747 CIFSSMBClose(xid, pTcon, netfid);
748 if (direntry->d_inode)
749 drop_nlink(direntry->d_inode);
750 }
751 /* BB if rc = -ETXTBUSY goto the rename logic BB */
752 }
753 }
754 }
755 if (direntry->d_inode) {
756 cifsInode = CIFS_I(direntry->d_inode);
757 cifsInode->time = 0; /* will force revalidate to get info
758 when needed */
759 direntry->d_inode->i_ctime = current_fs_time(inode->i_sb);
760 }
761 if (inode) {
762 inode->i_ctime = inode->i_mtime = current_fs_time(inode->i_sb);
763 cifsInode = CIFS_I(inode);
764 cifsInode->time = 0; /* force revalidate of dir as well */
765 }
766
767 kfree(full_path);
768 FreeXid(xid);
769 return rc;
770 }
771
772 static void posix_fill_in_inode(struct inode *tmp_inode,
773 FILE_UNIX_BASIC_INFO *pData, int *pobject_type, int isNewInode)
774 {
775 loff_t local_size;
776 struct timespec local_mtime;
777
778 struct cifsInodeInfo *cifsInfo = CIFS_I(tmp_inode);
779 struct cifs_sb_info *cifs_sb = CIFS_SB(tmp_inode->i_sb);
780
781 __u32 type = le32_to_cpu(pData->Type);
782 __u64 num_of_bytes = le64_to_cpu(pData->NumOfBytes);
783 __u64 end_of_file = le64_to_cpu(pData->EndOfFile);
784 cifsInfo->time = jiffies;
785 atomic_inc(&cifsInfo->inUse);
786
787 /* save mtime and size */
788 local_mtime = tmp_inode->i_mtime;
789 local_size = tmp_inode->i_size;
790
791 tmp_inode->i_atime =
792 cifs_NTtimeToUnix(le64_to_cpu(pData->LastAccessTime));
793 tmp_inode->i_mtime =
794 cifs_NTtimeToUnix(le64_to_cpu(pData->LastModificationTime));
795 tmp_inode->i_ctime =
796 cifs_NTtimeToUnix(le64_to_cpu(pData->LastStatusChange));
797
798 tmp_inode->i_mode = le64_to_cpu(pData->Permissions);
799 /* since we set the inode type below we need to mask off type
800 to avoid strange results if bits above were corrupt */
801 tmp_inode->i_mode &= ~S_IFMT;
802 if (type == UNIX_FILE) {
803 *pobject_type = DT_REG;
804 tmp_inode->i_mode |= S_IFREG;
805 } else if (type == UNIX_SYMLINK) {
806 *pobject_type = DT_LNK;
807 tmp_inode->i_mode |= S_IFLNK;
808 } else if (type == UNIX_DIR) {
809 *pobject_type = DT_DIR;
810 tmp_inode->i_mode |= S_IFDIR;
811 } else if (type == UNIX_CHARDEV) {
812 *pobject_type = DT_CHR;
813 tmp_inode->i_mode |= S_IFCHR;
814 tmp_inode->i_rdev = MKDEV(le64_to_cpu(pData->DevMajor),
815 le64_to_cpu(pData->DevMinor) & MINORMASK);
816 } else if (type == UNIX_BLOCKDEV) {
817 *pobject_type = DT_BLK;
818 tmp_inode->i_mode |= S_IFBLK;
819 tmp_inode->i_rdev = MKDEV(le64_to_cpu(pData->DevMajor),
820 le64_to_cpu(pData->DevMinor) & MINORMASK);
821 } else if (type == UNIX_FIFO) {
822 *pobject_type = DT_FIFO;
823 tmp_inode->i_mode |= S_IFIFO;
824 } else if (type == UNIX_SOCKET) {
825 *pobject_type = DT_SOCK;
826 tmp_inode->i_mode |= S_IFSOCK;
827 } else {
828 /* safest to just call it a file */
829 *pobject_type = DT_REG;
830 tmp_inode->i_mode |= S_IFREG;
831 cFYI(1, ("unknown inode type %d", type));
832 }
833
834 #ifdef CONFIG_CIFS_DEBUG2
835 cFYI(1, ("object type: %d", type));
836 #endif
837 tmp_inode->i_uid = le64_to_cpu(pData->Uid);
838 tmp_inode->i_gid = le64_to_cpu(pData->Gid);
839 tmp_inode->i_nlink = le64_to_cpu(pData->Nlinks);
840
841 spin_lock(&tmp_inode->i_lock);
842 if (is_size_safe_to_change(cifsInfo, end_of_file)) {
843 /* can not safely change the file size here if the
844 client is writing to it due to potential races */
845 i_size_write(tmp_inode, end_of_file);
846
847 /* 512 bytes (2**9) is the fake blocksize that must be used */
848 /* for this calculation, not the real blocksize */
849 tmp_inode->i_blocks = (512 - 1 + num_of_bytes) >> 9;
850 }
851 spin_unlock(&tmp_inode->i_lock);
852
853 if (S_ISREG(tmp_inode->i_mode)) {
854 cFYI(1, ("File inode"));
855 tmp_inode->i_op = &cifs_file_inode_ops;
856
857 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DIRECT_IO) {
858 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_BRL)
859 tmp_inode->i_fop = &cifs_file_direct_nobrl_ops;
860 else
861 tmp_inode->i_fop = &cifs_file_direct_ops;
862
863 } else if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_BRL)
864 tmp_inode->i_fop = &cifs_file_nobrl_ops;
865 else
866 tmp_inode->i_fop = &cifs_file_ops;
867
868 if ((cifs_sb->tcon) && (cifs_sb->tcon->ses) &&
869 (cifs_sb->tcon->ses->server->maxBuf <
870 PAGE_CACHE_SIZE + MAX_CIFS_HDR_SIZE))
871 tmp_inode->i_data.a_ops = &cifs_addr_ops_smallbuf;
872 else
873 tmp_inode->i_data.a_ops = &cifs_addr_ops;
874
875 if (isNewInode)
876 return; /* No sense invalidating pages for new inode
877 since we we have not started caching
878 readahead file data yet */
879
880 if (timespec_equal(&tmp_inode->i_mtime, &local_mtime) &&
881 (local_size == tmp_inode->i_size)) {
882 cFYI(1, ("inode exists but unchanged"));
883 } else {
884 /* file may have changed on server */
885 cFYI(1, ("invalidate inode, readdir detected change"));
886 invalidate_remote_inode(tmp_inode);
887 }
888 } else if (S_ISDIR(tmp_inode->i_mode)) {
889 cFYI(1, ("Directory inode"));
890 tmp_inode->i_op = &cifs_dir_inode_ops;
891 tmp_inode->i_fop = &cifs_dir_ops;
892 } else if (S_ISLNK(tmp_inode->i_mode)) {
893 cFYI(1, ("Symbolic Link inode"));
894 tmp_inode->i_op = &cifs_symlink_inode_ops;
895 /* tmp_inode->i_fop = *//* do not need to set to anything */
896 } else {
897 cFYI(1, ("Special inode"));
898 init_special_inode(tmp_inode, tmp_inode->i_mode,
899 tmp_inode->i_rdev);
900 }
901 }
902
903 int cifs_mkdir(struct inode *inode, struct dentry *direntry, int mode)
904 {
905 int rc = 0;
906 int xid;
907 struct cifs_sb_info *cifs_sb;
908 struct cifsTconInfo *pTcon;
909 char *full_path = NULL;
910 struct inode *newinode = NULL;
911
912 cFYI(1, ("In cifs_mkdir, mode = 0x%x inode = 0x%p", mode, inode));
913
914 xid = GetXid();
915
916 cifs_sb = CIFS_SB(inode->i_sb);
917 pTcon = cifs_sb->tcon;
918
919 full_path = build_path_from_dentry(direntry);
920 if (full_path == NULL) {
921 FreeXid(xid);
922 return -ENOMEM;
923 }
924
925 if ((pTcon->ses->capabilities & CAP_UNIX) &&
926 (CIFS_UNIX_POSIX_PATH_OPS_CAP &
927 le64_to_cpu(pTcon->fsUnixInfo.Capability))) {
928 u32 oplock = 0;
929 FILE_UNIX_BASIC_INFO * pInfo =
930 kzalloc(sizeof(FILE_UNIX_BASIC_INFO), GFP_KERNEL);
931 if (pInfo == NULL) {
932 rc = -ENOMEM;
933 goto mkdir_out;
934 }
935
936 mode &= ~current->fs->umask;
937 rc = CIFSPOSIXCreate(xid, pTcon, SMB_O_DIRECTORY | SMB_O_CREAT,
938 mode, NULL /* netfid */, pInfo, &oplock,
939 full_path, cifs_sb->local_nls,
940 cifs_sb->mnt_cifs_flags &
941 CIFS_MOUNT_MAP_SPECIAL_CHR);
942 if (rc == -EOPNOTSUPP) {
943 kfree(pInfo);
944 goto mkdir_retry_old;
945 } else if (rc) {
946 cFYI(1, ("posix mkdir returned 0x%x", rc));
947 d_drop(direntry);
948 } else {
949 int obj_type;
950 if (pInfo->Type == -1) /* no return info - go query */ {
951 kfree(pInfo);
952 goto mkdir_get_info;
953 }
954 /*BB check (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SET_UID ) to see if need
955 to set uid/gid */
956 inc_nlink(inode);
957 if (pTcon->nocase)
958 direntry->d_op = &cifs_ci_dentry_ops;
959 else
960 direntry->d_op = &cifs_dentry_ops;
961
962 newinode = new_inode(inode->i_sb);
963 if (newinode == NULL) {
964 kfree(pInfo);
965 goto mkdir_get_info;
966 }
967 /* Is an i_ino of zero legal? */
968 /* Are there sanity checks we can use to ensure that
969 the server is really filling in that field? */
970 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM) {
971 newinode->i_ino =
972 (unsigned long)pInfo->UniqueId;
973 } /* note ino incremented to unique num in new_inode */
974 if (inode->i_sb->s_flags & MS_NOATIME)
975 newinode->i_flags |= S_NOATIME | S_NOCMTIME;
976 newinode->i_nlink = 2;
977
978 insert_inode_hash(newinode);
979 d_instantiate(direntry, newinode);
980
981 /* we already checked in POSIXCreate whether
982 frame was long enough */
983 posix_fill_in_inode(direntry->d_inode,
984 pInfo, &obj_type, 1 /* NewInode */);
985 #ifdef CONFIG_CIFS_DEBUG2
986 cFYI(1, ("instantiated dentry %p %s to inode %p",
987 direntry, direntry->d_name.name, newinode));
988
989 if (newinode->i_nlink != 2)
990 cFYI(1, ("unexpected number of links %d",
991 newinode->i_nlink));
992 #endif
993 }
994 kfree(pInfo);
995 goto mkdir_out;
996 }
997 mkdir_retry_old:
998 /* BB add setting the equivalent of mode via CreateX w/ACLs */
999 rc = CIFSSMBMkDir(xid, pTcon, full_path, cifs_sb->local_nls,
1000 cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR);
1001 if (rc) {
1002 cFYI(1, ("cifs_mkdir returned 0x%x", rc));
1003 d_drop(direntry);
1004 } else {
1005 mkdir_get_info:
1006 inc_nlink(inode);
1007 if (pTcon->unix_ext)
1008 rc = cifs_get_inode_info_unix(&newinode, full_path,
1009 inode->i_sb, xid);
1010 else
1011 rc = cifs_get_inode_info(&newinode, full_path, NULL,
1012 inode->i_sb, xid);
1013
1014 if (pTcon->nocase)
1015 direntry->d_op = &cifs_ci_dentry_ops;
1016 else
1017 direntry->d_op = &cifs_dentry_ops;
1018 d_instantiate(direntry, newinode);
1019 /* setting nlink not necessary except in cases where we
1020 * failed to get it from the server or was set bogus */
1021 if ((direntry->d_inode) && (direntry->d_inode->i_nlink < 2))
1022 direntry->d_inode->i_nlink = 2;
1023 if (pTcon->unix_ext) {
1024 mode &= ~current->fs->umask;
1025 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SET_UID) {
1026 CIFSSMBUnixSetPerms(xid, pTcon, full_path,
1027 mode,
1028 (__u64)current->fsuid,
1029 (__u64)current->fsgid,
1030 0 /* dev_t */,
1031 cifs_sb->local_nls,
1032 cifs_sb->mnt_cifs_flags &
1033 CIFS_MOUNT_MAP_SPECIAL_CHR);
1034 } else {
1035 CIFSSMBUnixSetPerms(xid, pTcon, full_path,
1036 mode, (__u64)-1,
1037 (__u64)-1, 0 /* dev_t */,
1038 cifs_sb->local_nls,
1039 cifs_sb->mnt_cifs_flags &
1040 CIFS_MOUNT_MAP_SPECIAL_CHR);
1041 }
1042 } else {
1043 /* BB to be implemented via Windows secrty descriptors
1044 eg CIFSSMBWinSetPerms(xid, pTcon, full_path, mode,
1045 -1, -1, local_nls); */
1046 if (direntry->d_inode) {
1047 direntry->d_inode->i_mode = mode;
1048 direntry->d_inode->i_mode |= S_IFDIR;
1049 if (cifs_sb->mnt_cifs_flags &
1050 CIFS_MOUNT_SET_UID) {
1051 direntry->d_inode->i_uid =
1052 current->fsuid;
1053 direntry->d_inode->i_gid =
1054 current->fsgid;
1055 }
1056 }
1057 }
1058 }
1059 mkdir_out:
1060 kfree(full_path);
1061 FreeXid(xid);
1062 return rc;
1063 }
1064
1065 int cifs_rmdir(struct inode *inode, struct dentry *direntry)
1066 {
1067 int rc = 0;
1068 int xid;
1069 struct cifs_sb_info *cifs_sb;
1070 struct cifsTconInfo *pTcon;
1071 char *full_path = NULL;
1072 struct cifsInodeInfo *cifsInode;
1073
1074 cFYI(1, ("cifs_rmdir, inode = 0x%p", inode));
1075
1076 xid = GetXid();
1077
1078 cifs_sb = CIFS_SB(inode->i_sb);
1079 pTcon = cifs_sb->tcon;
1080
1081 full_path = build_path_from_dentry(direntry);
1082 if (full_path == NULL) {
1083 FreeXid(xid);
1084 return -ENOMEM;
1085 }
1086
1087 rc = CIFSSMBRmDir(xid, pTcon, full_path, cifs_sb->local_nls,
1088 cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR);
1089
1090 if (!rc) {
1091 drop_nlink(inode);
1092 spin_lock(&direntry->d_inode->i_lock);
1093 i_size_write(direntry->d_inode, 0);
1094 clear_nlink(direntry->d_inode);
1095 spin_unlock(&direntry->d_inode->i_lock);
1096 }
1097
1098 cifsInode = CIFS_I(direntry->d_inode);
1099 cifsInode->time = 0; /* force revalidate to go get info when
1100 needed */
1101 direntry->d_inode->i_ctime = inode->i_ctime = inode->i_mtime =
1102 current_fs_time(inode->i_sb);
1103
1104 kfree(full_path);
1105 FreeXid(xid);
1106 return rc;
1107 }
1108
1109 int cifs_rename(struct inode *source_inode, struct dentry *source_direntry,
1110 struct inode *target_inode, struct dentry *target_direntry)
1111 {
1112 char *fromName;
1113 char *toName;
1114 struct cifs_sb_info *cifs_sb_source;
1115 struct cifs_sb_info *cifs_sb_target;
1116 struct cifsTconInfo *pTcon;
1117 int xid;
1118 int rc = 0;
1119
1120 xid = GetXid();
1121
1122 cifs_sb_target = CIFS_SB(target_inode->i_sb);
1123 cifs_sb_source = CIFS_SB(source_inode->i_sb);
1124 pTcon = cifs_sb_source->tcon;
1125
1126 if (pTcon != cifs_sb_target->tcon) {
1127 FreeXid(xid);
1128 return -EXDEV; /* BB actually could be allowed if same server,
1129 but different share.
1130 Might eventually add support for this */
1131 }
1132
1133 /* we already have the rename sem so we do not need to grab it again
1134 here to protect the path integrity */
1135 fromName = build_path_from_dentry(source_direntry);
1136 toName = build_path_from_dentry(target_direntry);
1137 if ((fromName == NULL) || (toName == NULL)) {
1138 rc = -ENOMEM;
1139 goto cifs_rename_exit;
1140 }
1141
1142 rc = CIFSSMBRename(xid, pTcon, fromName, toName,
1143 cifs_sb_source->local_nls,
1144 cifs_sb_source->mnt_cifs_flags &
1145 CIFS_MOUNT_MAP_SPECIAL_CHR);
1146 if (rc == -EEXIST) {
1147 /* check if they are the same file because rename of hardlinked
1148 files is a noop */
1149 FILE_UNIX_BASIC_INFO *info_buf_source;
1150 FILE_UNIX_BASIC_INFO *info_buf_target;
1151
1152 info_buf_source =
1153 kmalloc(2 * sizeof(FILE_UNIX_BASIC_INFO), GFP_KERNEL);
1154 if (info_buf_source != NULL) {
1155 info_buf_target = info_buf_source + 1;
1156 if (pTcon->unix_ext)
1157 rc = CIFSSMBUnixQPathInfo(xid, pTcon, fromName,
1158 info_buf_source,
1159 cifs_sb_source->local_nls,
1160 cifs_sb_source->mnt_cifs_flags &
1161 CIFS_MOUNT_MAP_SPECIAL_CHR);
1162 /* else rc is still EEXIST so will fall through to
1163 unlink the target and retry rename */
1164 if (rc == 0) {
1165 rc = CIFSSMBUnixQPathInfo(xid, pTcon, toName,
1166 info_buf_target,
1167 cifs_sb_target->local_nls,
1168 /* remap based on source sb */
1169 cifs_sb_source->mnt_cifs_flags &
1170 CIFS_MOUNT_MAP_SPECIAL_CHR);
1171 }
1172 if ((rc == 0) &&
1173 (info_buf_source->UniqueId ==
1174 info_buf_target->UniqueId)) {
1175 /* do not rename since the files are hardlinked which
1176 is a noop */
1177 } else {
1178 /* we either can not tell the files are hardlinked
1179 (as with Windows servers) or files are not
1180 hardlinked so delete the target manually before
1181 renaming to follow POSIX rather than Windows
1182 semantics */
1183 cifs_unlink(target_inode, target_direntry);
1184 rc = CIFSSMBRename(xid, pTcon, fromName,
1185 toName,
1186 cifs_sb_source->local_nls,
1187 cifs_sb_source->mnt_cifs_flags
1188 & CIFS_MOUNT_MAP_SPECIAL_CHR);
1189 }
1190 kfree(info_buf_source);
1191 } /* if we can not get memory just leave rc as EEXIST */
1192 }
1193
1194 if (rc) {
1195 cFYI(1, ("rename rc %d", rc));
1196 }
1197
1198 if ((rc == -EIO) || (rc == -EEXIST)) {
1199 int oplock = FALSE;
1200 __u16 netfid;
1201
1202 /* BB FIXME Is Generic Read correct for rename? */
1203 /* if renaming directory - we should not say CREATE_NOT_DIR,
1204 need to test renaming open directory, also GENERIC_READ
1205 might not right be right access to request */
1206 rc = CIFSSMBOpen(xid, pTcon, fromName, FILE_OPEN, GENERIC_READ,
1207 CREATE_NOT_DIR, &netfid, &oplock, NULL,
1208 cifs_sb_source->local_nls,
1209 cifs_sb_source->mnt_cifs_flags &
1210 CIFS_MOUNT_MAP_SPECIAL_CHR);
1211 if (rc == 0) {
1212 rc = CIFSSMBRenameOpenFile(xid, pTcon, netfid, toName,
1213 cifs_sb_source->local_nls,
1214 cifs_sb_source->mnt_cifs_flags &
1215 CIFS_MOUNT_MAP_SPECIAL_CHR);
1216 CIFSSMBClose(xid, pTcon, netfid);
1217 }
1218 }
1219
1220 cifs_rename_exit:
1221 kfree(fromName);
1222 kfree(toName);
1223 FreeXid(xid);
1224 return rc;
1225 }
1226
1227 int cifs_revalidate(struct dentry *direntry)
1228 {
1229 int xid;
1230 int rc = 0;
1231 char *full_path;
1232 struct cifs_sb_info *cifs_sb;
1233 struct cifsInodeInfo *cifsInode;
1234 loff_t local_size;
1235 struct timespec local_mtime;
1236 int invalidate_inode = FALSE;
1237
1238 if (direntry->d_inode == NULL)
1239 return -ENOENT;
1240
1241 cifsInode = CIFS_I(direntry->d_inode);
1242
1243 if (cifsInode == NULL)
1244 return -ENOENT;
1245
1246 /* no sense revalidating inode info on file that no one can write */
1247 if (CIFS_I(direntry->d_inode)->clientCanCacheRead)
1248 return rc;
1249
1250 xid = GetXid();
1251
1252 cifs_sb = CIFS_SB(direntry->d_sb);
1253
1254 /* can not safely grab the rename sem here if rename calls revalidate
1255 since that would deadlock */
1256 full_path = build_path_from_dentry(direntry);
1257 if (full_path == NULL) {
1258 FreeXid(xid);
1259 return -ENOMEM;
1260 }
1261 cFYI(1, ("Revalidate: %s inode 0x%p count %d dentry: 0x%p d_time %ld "
1262 "jiffies %ld", full_path, direntry->d_inode,
1263 direntry->d_inode->i_count.counter, direntry,
1264 direntry->d_time, jiffies));
1265
1266 if (cifsInode->time == 0) {
1267 /* was set to zero previously to force revalidate */
1268 } else if (time_before(jiffies, cifsInode->time + HZ) &&
1269 lookupCacheEnabled) {
1270 if ((S_ISREG(direntry->d_inode->i_mode) == 0) ||
1271 (direntry->d_inode->i_nlink == 1)) {
1272 kfree(full_path);
1273 FreeXid(xid);
1274 return rc;
1275 } else {
1276 cFYI(1, ("Have to revalidate file due to hardlinks"));
1277 }
1278 }
1279
1280 /* save mtime and size */
1281 local_mtime = direntry->d_inode->i_mtime;
1282 local_size = direntry->d_inode->i_size;
1283
1284 if (cifs_sb->tcon->unix_ext) {
1285 rc = cifs_get_inode_info_unix(&direntry->d_inode, full_path,
1286 direntry->d_sb, xid);
1287 if (rc) {
1288 cFYI(1, ("error on getting revalidate info %d", rc));
1289 /* if (rc != -ENOENT)
1290 rc = 0; */ /* BB should we cache info on
1291 certain errors? */
1292 }
1293 } else {
1294 rc = cifs_get_inode_info(&direntry->d_inode, full_path, NULL,
1295 direntry->d_sb, xid);
1296 if (rc) {
1297 cFYI(1, ("error on getting revalidate info %d", rc));
1298 /* if (rc != -ENOENT)
1299 rc = 0; */ /* BB should we cache info on
1300 certain errors? */
1301 }
1302 }
1303 /* should we remap certain errors, access denied?, to zero */
1304
1305 /* if not oplocked, we invalidate inode pages if mtime or file size
1306 had changed on server */
1307
1308 if (timespec_equal(&local_mtime, &direntry->d_inode->i_mtime) &&
1309 (local_size == direntry->d_inode->i_size)) {
1310 cFYI(1, ("cifs_revalidate - inode unchanged"));
1311 } else {
1312 /* file may have changed on server */
1313 if (cifsInode->clientCanCacheRead) {
1314 /* no need to invalidate inode pages since we were the
1315 only ones who could have modified the file and the
1316 server copy is staler than ours */
1317 } else {
1318 invalidate_inode = TRUE;
1319 }
1320 }
1321
1322 /* can not grab this sem since kernel filesys locking documentation
1323 indicates i_mutex may be taken by the kernel on lookup and rename
1324 which could deadlock if we grab the i_mutex here as well */
1325 /* mutex_lock(&direntry->d_inode->i_mutex);*/
1326 /* need to write out dirty pages here */
1327 if (direntry->d_inode->i_mapping) {
1328 /* do we need to lock inode until after invalidate completes
1329 below? */
1330 filemap_fdatawrite(direntry->d_inode->i_mapping);
1331 }
1332 if (invalidate_inode) {
1333 /* shrink_dcache not necessary now that cifs dentry ops
1334 are exported for negative dentries */
1335 /* if (S_ISDIR(direntry->d_inode->i_mode))
1336 shrink_dcache_parent(direntry); */
1337 if (S_ISREG(direntry->d_inode->i_mode)) {
1338 if (direntry->d_inode->i_mapping)
1339 filemap_fdatawait(direntry->d_inode->i_mapping);
1340 /* may eventually have to do this for open files too */
1341 if (list_empty(&(cifsInode->openFileList))) {
1342 /* changed on server - flush read ahead pages */
1343 cFYI(1, ("Invalidating read ahead data on "
1344 "closed file"));
1345 invalidate_remote_inode(direntry->d_inode);
1346 }
1347 }
1348 }
1349 /* mutex_unlock(&direntry->d_inode->i_mutex); */
1350
1351 kfree(full_path);
1352 FreeXid(xid);
1353 return rc;
1354 }
1355
1356 int cifs_getattr(struct vfsmount *mnt, struct dentry *dentry,
1357 struct kstat *stat)
1358 {
1359 int err = cifs_revalidate(dentry);
1360 if (!err) {
1361 generic_fillattr(dentry->d_inode, stat);
1362 stat->blksize = CIFS_MAX_MSGSIZE;
1363 }
1364 return err;
1365 }
1366
1367 static int cifs_truncate_page(struct address_space *mapping, loff_t from)
1368 {
1369 pgoff_t index = from >> PAGE_CACHE_SHIFT;
1370 unsigned offset = from & (PAGE_CACHE_SIZE - 1);
1371 struct page *page;
1372 int rc = 0;
1373
1374 page = grab_cache_page(mapping, index);
1375 if (!page)
1376 return -ENOMEM;
1377
1378 zero_user_page(page, offset, PAGE_CACHE_SIZE - offset, KM_USER0);
1379 unlock_page(page);
1380 page_cache_release(page);
1381 return rc;
1382 }
1383
1384 static int cifs_vmtruncate(struct inode *inode, loff_t offset)
1385 {
1386 struct address_space *mapping = inode->i_mapping;
1387 unsigned long limit;
1388
1389 spin_lock(&inode->i_lock);
1390 if (inode->i_size < offset)
1391 goto do_expand;
1392 /*
1393 * truncation of in-use swapfiles is disallowed - it would cause
1394 * subsequent swapout to scribble on the now-freed blocks.
1395 */
1396 if (IS_SWAPFILE(inode)) {
1397 spin_unlock(&inode->i_lock);
1398 goto out_busy;
1399 }
1400 i_size_write(inode, offset);
1401 spin_unlock(&inode->i_lock);
1402 /*
1403 * unmap_mapping_range is called twice, first simply for efficiency
1404 * so that truncate_inode_pages does fewer single-page unmaps. However
1405 * after this first call, and before truncate_inode_pages finishes,
1406 * it is possible for private pages to be COWed, which remain after
1407 * truncate_inode_pages finishes, hence the second unmap_mapping_range
1408 * call must be made for correctness.
1409 */
1410 unmap_mapping_range(mapping, offset + PAGE_SIZE - 1, 0, 1);
1411 truncate_inode_pages(mapping, offset);
1412 unmap_mapping_range(mapping, offset + PAGE_SIZE - 1, 0, 1);
1413 goto out_truncate;
1414
1415 do_expand:
1416 limit = current->signal->rlim[RLIMIT_FSIZE].rlim_cur;
1417 if (limit != RLIM_INFINITY && offset > limit) {
1418 spin_unlock(&inode->i_lock);
1419 goto out_sig;
1420 }
1421 if (offset > inode->i_sb->s_maxbytes) {
1422 spin_unlock(&inode->i_lock);
1423 goto out_big;
1424 }
1425 i_size_write(inode, offset);
1426 spin_unlock(&inode->i_lock);
1427 out_truncate:
1428 if (inode->i_op && inode->i_op->truncate)
1429 inode->i_op->truncate(inode);
1430 return 0;
1431 out_sig:
1432 send_sig(SIGXFSZ, current, 0);
1433 out_big:
1434 return -EFBIG;
1435 out_busy:
1436 return -ETXTBSY;
1437 }
1438
1439 int cifs_setattr(struct dentry *direntry, struct iattr *attrs)
1440 {
1441 int xid;
1442 struct cifs_sb_info *cifs_sb;
1443 struct cifsTconInfo *pTcon;
1444 char *full_path = NULL;
1445 int rc = -EACCES;
1446 struct cifsFileInfo *open_file = NULL;
1447 FILE_BASIC_INFO time_buf;
1448 int set_time = FALSE;
1449 int set_dosattr = FALSE;
1450 __u64 mode = 0xFFFFFFFFFFFFFFFFULL;
1451 __u64 uid = 0xFFFFFFFFFFFFFFFFULL;
1452 __u64 gid = 0xFFFFFFFFFFFFFFFFULL;
1453 struct cifsInodeInfo *cifsInode;
1454
1455 xid = GetXid();
1456
1457 cFYI(1, ("setattr on file %s attrs->iavalid 0x%x",
1458 direntry->d_name.name, attrs->ia_valid));
1459
1460 cifs_sb = CIFS_SB(direntry->d_inode->i_sb);
1461 pTcon = cifs_sb->tcon;
1462
1463 if ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_PERM) == 0) {
1464 /* check if we have permission to change attrs */
1465 rc = inode_change_ok(direntry->d_inode, attrs);
1466 if (rc < 0) {
1467 FreeXid(xid);
1468 return rc;
1469 } else
1470 rc = 0;
1471 }
1472
1473 full_path = build_path_from_dentry(direntry);
1474 if (full_path == NULL) {
1475 FreeXid(xid);
1476 return -ENOMEM;
1477 }
1478 cifsInode = CIFS_I(direntry->d_inode);
1479
1480 /* BB check if we need to refresh inode from server now ? BB */
1481
1482 /* need to flush data before changing file size on server */
1483 filemap_write_and_wait(direntry->d_inode->i_mapping);
1484
1485 if (attrs->ia_valid & ATTR_SIZE) {
1486 /* To avoid spurious oplock breaks from server, in the case of
1487 inodes that we already have open, avoid doing path based
1488 setting of file size if we can do it by handle.
1489 This keeps our caching token (oplock) and avoids timeouts
1490 when the local oplock break takes longer to flush
1491 writebehind data than the SMB timeout for the SetPathInfo
1492 request would allow */
1493
1494 open_file = find_writable_file(cifsInode);
1495 if (open_file) {
1496 __u16 nfid = open_file->netfid;
1497 __u32 npid = open_file->pid;
1498 rc = CIFSSMBSetFileSize(xid, pTcon, attrs->ia_size,
1499 nfid, npid, FALSE);
1500 atomic_dec(&open_file->wrtPending);
1501 cFYI(1, ("SetFSize for attrs rc = %d", rc));
1502 if ((rc == -EINVAL) || (rc == -EOPNOTSUPP)) {
1503 unsigned int bytes_written;
1504 rc = CIFSSMBWrite(xid, pTcon,
1505 nfid, 0, attrs->ia_size,
1506 &bytes_written, NULL, NULL,
1507 1 /* 45 seconds */);
1508 cFYI(1, ("Wrt seteof rc %d", rc));
1509 }
1510 } else
1511 rc = -EINVAL;
1512
1513 if (rc != 0) {
1514 /* Set file size by pathname rather than by handle
1515 either because no valid, writeable file handle for
1516 it was found or because there was an error setting
1517 it by handle */
1518 rc = CIFSSMBSetEOF(xid, pTcon, full_path,
1519 attrs->ia_size, FALSE,
1520 cifs_sb->local_nls,
1521 cifs_sb->mnt_cifs_flags &
1522 CIFS_MOUNT_MAP_SPECIAL_CHR);
1523 cFYI(1, ("SetEOF by path (setattrs) rc = %d", rc));
1524 if ((rc == -EINVAL) || (rc == -EOPNOTSUPP)) {
1525 __u16 netfid;
1526 int oplock = FALSE;
1527
1528 rc = SMBLegacyOpen(xid, pTcon, full_path,
1529 FILE_OPEN,
1530 SYNCHRONIZE | FILE_WRITE_ATTRIBUTES,
1531 CREATE_NOT_DIR, &netfid, &oplock,
1532 NULL, cifs_sb->local_nls,
1533 cifs_sb->mnt_cifs_flags &
1534 CIFS_MOUNT_MAP_SPECIAL_CHR);
1535 if (rc == 0) {
1536 unsigned int bytes_written;
1537 rc = CIFSSMBWrite(xid, pTcon,
1538 netfid, 0,
1539 attrs->ia_size,
1540 &bytes_written, NULL,
1541 NULL, 1 /* 45 sec */);
1542 cFYI(1, ("wrt seteof rc %d", rc));
1543 CIFSSMBClose(xid, pTcon, netfid);
1544 }
1545
1546 }
1547 }
1548
1549 /* Server is ok setting allocation size implicitly - no need
1550 to call:
1551 CIFSSMBSetEOF(xid, pTcon, full_path, attrs->ia_size, TRUE,
1552 cifs_sb->local_nls);
1553 */
1554
1555 if (rc == 0) {
1556 rc = cifs_vmtruncate(direntry->d_inode, attrs->ia_size);
1557 cifs_truncate_page(direntry->d_inode->i_mapping,
1558 direntry->d_inode->i_size);
1559 } else
1560 goto cifs_setattr_exit;
1561 }
1562 if (attrs->ia_valid & ATTR_UID) {
1563 cFYI(1, ("UID changed to %d", attrs->ia_uid));
1564 uid = attrs->ia_uid;
1565 }
1566 if (attrs->ia_valid & ATTR_GID) {
1567 cFYI(1, ("GID changed to %d", attrs->ia_gid));
1568 gid = attrs->ia_gid;
1569 }
1570
1571 time_buf.Attributes = 0;
1572 if (attrs->ia_valid & ATTR_MODE) {
1573 cFYI(1, ("Mode changed to 0x%x", attrs->ia_mode));
1574 mode = attrs->ia_mode;
1575 }
1576
1577 if ((pTcon->unix_ext)
1578 && (attrs->ia_valid & (ATTR_MODE | ATTR_GID | ATTR_UID)))
1579 rc = CIFSSMBUnixSetPerms(xid, pTcon, full_path, mode, uid, gid,
1580 0 /* dev_t */, cifs_sb->local_nls,
1581 cifs_sb->mnt_cifs_flags &
1582 CIFS_MOUNT_MAP_SPECIAL_CHR);
1583 else if (attrs->ia_valid & ATTR_MODE) {
1584 rc = 0;
1585 if ((mode & S_IWUGO) == 0) /* not writeable */ {
1586 if ((cifsInode->cifsAttrs & ATTR_READONLY) == 0) {
1587 set_dosattr = TRUE;
1588 time_buf.Attributes =
1589 cpu_to_le32(cifsInode->cifsAttrs |
1590 ATTR_READONLY);
1591 }
1592 } else if (cifsInode->cifsAttrs & ATTR_READONLY) {
1593 /* If file is readonly on server, we would
1594 not be able to write to it - so if any write
1595 bit is enabled for user or group or other we
1596 need to at least try to remove r/o dos attr */
1597 set_dosattr = TRUE;
1598 time_buf.Attributes = cpu_to_le32(cifsInode->cifsAttrs &
1599 (~ATTR_READONLY));
1600 /* Windows ignores set to zero */
1601 if (time_buf.Attributes == 0)
1602 time_buf.Attributes |= cpu_to_le32(ATTR_NORMAL);
1603 }
1604 /* BB to be implemented -
1605 via Windows security descriptors or streams */
1606 /* CIFSSMBWinSetPerms(xid, pTcon, full_path, mode, uid, gid,
1607 cifs_sb->local_nls); */
1608 }
1609
1610 if (attrs->ia_valid & ATTR_ATIME) {
1611 set_time = TRUE;
1612 time_buf.LastAccessTime =
1613 cpu_to_le64(cifs_UnixTimeToNT(attrs->ia_atime));
1614 } else
1615 time_buf.LastAccessTime = 0;
1616
1617 if (attrs->ia_valid & ATTR_MTIME) {
1618 set_time = TRUE;
1619 time_buf.LastWriteTime =
1620 cpu_to_le64(cifs_UnixTimeToNT(attrs->ia_mtime));
1621 } else
1622 time_buf.LastWriteTime = 0;
1623 /* Do not set ctime explicitly unless other time
1624 stamps are changed explicitly (i.e. by utime()
1625 since we would then have a mix of client and
1626 server times */
1627
1628 if (set_time && (attrs->ia_valid & ATTR_CTIME)) {
1629 set_time = TRUE;
1630 /* Although Samba throws this field away
1631 it may be useful to Windows - but we do
1632 not want to set ctime unless some other
1633 timestamp is changing */
1634 cFYI(1, ("CIFS - CTIME changed"));
1635 time_buf.ChangeTime =
1636 cpu_to_le64(cifs_UnixTimeToNT(attrs->ia_ctime));
1637 } else
1638 time_buf.ChangeTime = 0;
1639
1640 if (set_time || set_dosattr) {
1641 time_buf.CreationTime = 0; /* do not change */
1642 /* In the future we should experiment - try setting timestamps
1643 via Handle (SetFileInfo) instead of by path */
1644 if (!(pTcon->ses->flags & CIFS_SES_NT4))
1645 rc = CIFSSMBSetTimes(xid, pTcon, full_path, &time_buf,
1646 cifs_sb->local_nls,
1647 cifs_sb->mnt_cifs_flags &
1648 CIFS_MOUNT_MAP_SPECIAL_CHR);
1649 else
1650 rc = -EOPNOTSUPP;
1651
1652 if (rc == -EOPNOTSUPP) {
1653 int oplock = FALSE;
1654 __u16 netfid;
1655
1656 cFYI(1, ("calling SetFileInfo since SetPathInfo for "
1657 "times not supported by this server"));
1658 /* BB we could scan to see if we already have it open
1659 and pass in pid of opener to function */
1660 rc = CIFSSMBOpen(xid, pTcon, full_path, FILE_OPEN,
1661 SYNCHRONIZE | FILE_WRITE_ATTRIBUTES,
1662 CREATE_NOT_DIR, &netfid, &oplock,
1663 NULL, cifs_sb->local_nls,
1664 cifs_sb->mnt_cifs_flags &
1665 CIFS_MOUNT_MAP_SPECIAL_CHR);
1666 if (rc == 0) {
1667 rc = CIFSSMBSetFileTimes(xid, pTcon, &time_buf,
1668 netfid);
1669 CIFSSMBClose(xid, pTcon, netfid);
1670 } else {
1671 /* BB For even older servers we could convert time_buf
1672 into old DOS style which uses two second
1673 granularity */
1674
1675 /* rc = CIFSSMBSetTimesLegacy(xid, pTcon, full_path,
1676 &time_buf, cifs_sb->local_nls); */
1677 }
1678 }
1679 /* Even if error on time set, no sense failing the call if
1680 the server would set the time to a reasonable value anyway,
1681 and this check ensures that we are not being called from
1682 sys_utimes in which case we ought to fail the call back to
1683 the user when the server rejects the call */
1684 if ((rc) && (attrs->ia_valid &
1685 (ATTR_MODE | ATTR_GID | ATTR_UID | ATTR_SIZE)))
1686 rc = 0;
1687 }
1688
1689 /* do not need local check to inode_check_ok since the server does
1690 that */
1691 if (!rc)
1692 rc = inode_setattr(direntry->d_inode, attrs);
1693 cifs_setattr_exit:
1694 kfree(full_path);
1695 FreeXid(xid);
1696 return rc;
1697 }
1698
1699 #if 0
1700 void cifs_delete_inode(struct inode *inode)
1701 {
1702 cFYI(1, ("In cifs_delete_inode, inode = 0x%p", inode));
1703 /* may have to add back in if and when safe distributed caching of
1704 directories added e.g. via FindNotify */
1705 }
1706 #endif
Linux 2.6 libata-dev (mirror)