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fs: use kmem_cache_zalloc instead
[pv_ops_mirror.git] / fs / cifs / inode.c
blobdd4167762a8edaf847913027a9265e3c293144ac
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 /* gets root inode */
579 void cifs_read_inode(struct inode *inode)
580 {
581 int xid;
582 struct cifs_sb_info *cifs_sb;
583
584 cifs_sb = CIFS_SB(inode->i_sb);
585 xid = GetXid();
586
587 if (cifs_sb->tcon->unix_ext)
588 cifs_get_inode_info_unix(&inode, "", inode->i_sb, xid);
589 else
590 cifs_get_inode_info(&inode, "", NULL, inode->i_sb, xid);
591 /* can not call macro FreeXid here since in a void func */
592 _FreeXid(xid);
593 }
594
595 int cifs_unlink(struct inode *inode, struct dentry *direntry)
596 {
597 int rc = 0;
598 int xid;
599 struct cifs_sb_info *cifs_sb;
600 struct cifsTconInfo *pTcon;
601 char *full_path = NULL;
602 struct cifsInodeInfo *cifsInode;
603 FILE_BASIC_INFO *pinfo_buf;
604
605 cFYI(1, ("cifs_unlink, inode = 0x%p", inode));
606
607 xid = GetXid();
608
609 if (inode)
610 cifs_sb = CIFS_SB(inode->i_sb);
611 else
612 cifs_sb = CIFS_SB(direntry->d_sb);
613 pTcon = cifs_sb->tcon;
614
615 /* Unlink can be called from rename so we can not grab the sem here
616 since we deadlock otherwise */
617 /* mutex_lock(&direntry->d_sb->s_vfs_rename_mutex);*/
618 full_path = build_path_from_dentry(direntry);
619 /* mutex_unlock(&direntry->d_sb->s_vfs_rename_mutex);*/
620 if (full_path == NULL) {
621 FreeXid(xid);
622 return -ENOMEM;
623 }
624
625 if ((pTcon->ses->capabilities & CAP_UNIX) &&
626 (CIFS_UNIX_POSIX_PATH_OPS_CAP &
627 le64_to_cpu(pTcon->fsUnixInfo.Capability))) {
628 rc = CIFSPOSIXDelFile(xid, pTcon, full_path,
629 SMB_POSIX_UNLINK_FILE_TARGET, cifs_sb->local_nls,
630 cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR);
631 cFYI(1, ("posix del rc %d", rc));
632 if ((rc == 0) || (rc == -ENOENT))
633 goto psx_del_no_retry;
634 }
635
636 rc = CIFSSMBDelFile(xid, pTcon, full_path, cifs_sb->local_nls,
637 cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR);
638 psx_del_no_retry:
639 if (!rc) {
640 if (direntry->d_inode)
641 drop_nlink(direntry->d_inode);
642 } else if (rc == -ENOENT) {
643 d_drop(direntry);
644 } else if (rc == -ETXTBSY) {
645 int oplock = FALSE;
646 __u16 netfid;
647
648 rc = CIFSSMBOpen(xid, pTcon, full_path, FILE_OPEN, DELETE,
649 CREATE_NOT_DIR | CREATE_DELETE_ON_CLOSE,
650 &netfid, &oplock, NULL, cifs_sb->local_nls,
651 cifs_sb->mnt_cifs_flags &
652 CIFS_MOUNT_MAP_SPECIAL_CHR);
653 if (rc == 0) {
654 CIFSSMBRenameOpenFile(xid, pTcon, netfid, NULL,
655 cifs_sb->local_nls,
656 cifs_sb->mnt_cifs_flags &
657 CIFS_MOUNT_MAP_SPECIAL_CHR);
658 CIFSSMBClose(xid, pTcon, netfid);
659 if (direntry->d_inode)
660 drop_nlink(direntry->d_inode);
661 }
662 } else if (rc == -EACCES) {
663 /* try only if r/o attribute set in local lookup data? */
664 pinfo_buf = kzalloc(sizeof(FILE_BASIC_INFO), GFP_KERNEL);
665 if (pinfo_buf) {
666 /* ATTRS set to normal clears r/o bit */
667 pinfo_buf->Attributes = cpu_to_le32(ATTR_NORMAL);
668 if (!(pTcon->ses->flags & CIFS_SES_NT4))
669 rc = CIFSSMBSetTimes(xid, pTcon, full_path,
670 pinfo_buf,
671 cifs_sb->local_nls,
672 cifs_sb->mnt_cifs_flags &
673 CIFS_MOUNT_MAP_SPECIAL_CHR);
674 else
675 rc = -EOPNOTSUPP;
676
677 if (rc == -EOPNOTSUPP) {
678 int oplock = FALSE;
679 __u16 netfid;
680 /* rc = CIFSSMBSetAttrLegacy(xid, pTcon,
681 full_path,
682 (__u16)ATTR_NORMAL,
683 cifs_sb->local_nls);
684 For some strange reason it seems that NT4 eats the
685 old setattr call without actually setting the
686 attributes so on to the third attempted workaround
687 */
688
689 /* BB could scan to see if we already have it open
690 and pass in pid of opener to function */
691 rc = CIFSSMBOpen(xid, pTcon, full_path,
692 FILE_OPEN, SYNCHRONIZE |
693 FILE_WRITE_ATTRIBUTES, 0,
694 &netfid, &oplock, NULL,
695 cifs_sb->local_nls,
696 cifs_sb->mnt_cifs_flags &
697 CIFS_MOUNT_MAP_SPECIAL_CHR);
698 if (rc == 0) {
699 rc = CIFSSMBSetFileTimes(xid, pTcon,
700 pinfo_buf,
701 netfid);
702 CIFSSMBClose(xid, pTcon, netfid);
703 }
704 }
705 kfree(pinfo_buf);
706 }
707 if (rc == 0) {
708 rc = CIFSSMBDelFile(xid, pTcon, full_path,
709 cifs_sb->local_nls,
710 cifs_sb->mnt_cifs_flags &
711 CIFS_MOUNT_MAP_SPECIAL_CHR);
712 if (!rc) {
713 if (direntry->d_inode)
714 drop_nlink(direntry->d_inode);
715 } else if (rc == -ETXTBSY) {
716 int oplock = FALSE;
717 __u16 netfid;
718
719 rc = CIFSSMBOpen(xid, pTcon, full_path,
720 FILE_OPEN, DELETE,
721 CREATE_NOT_DIR |
722 CREATE_DELETE_ON_CLOSE,
723 &netfid, &oplock, NULL,
724 cifs_sb->local_nls,
725 cifs_sb->mnt_cifs_flags &
726 CIFS_MOUNT_MAP_SPECIAL_CHR);
727 if (rc == 0) {
728 CIFSSMBRenameOpenFile(xid, pTcon,
729 netfid, NULL,
730 cifs_sb->local_nls,
731 cifs_sb->mnt_cifs_flags &
732 CIFS_MOUNT_MAP_SPECIAL_CHR);
733 CIFSSMBClose(xid, pTcon, netfid);
734 if (direntry->d_inode)
735 drop_nlink(direntry->d_inode);
736 }
737 /* BB if rc = -ETXTBUSY goto the rename logic BB */
738 }
739 }
740 }
741 if (direntry->d_inode) {
742 cifsInode = CIFS_I(direntry->d_inode);
743 cifsInode->time = 0; /* will force revalidate to get info
744 when needed */
745 direntry->d_inode->i_ctime = current_fs_time(inode->i_sb);
746 }
747 if (inode) {
748 inode->i_ctime = inode->i_mtime = current_fs_time(inode->i_sb);
749 cifsInode = CIFS_I(inode);
750 cifsInode->time = 0; /* force revalidate of dir as well */
751 }
752
753 kfree(full_path);
754 FreeXid(xid);
755 return rc;
756 }
757
758 static void posix_fill_in_inode(struct inode *tmp_inode,
759 FILE_UNIX_BASIC_INFO *pData, int *pobject_type, int isNewInode)
760 {
761 loff_t local_size;
762 struct timespec local_mtime;
763
764 struct cifsInodeInfo *cifsInfo = CIFS_I(tmp_inode);
765 struct cifs_sb_info *cifs_sb = CIFS_SB(tmp_inode->i_sb);
766
767 __u32 type = le32_to_cpu(pData->Type);
768 __u64 num_of_bytes = le64_to_cpu(pData->NumOfBytes);
769 __u64 end_of_file = le64_to_cpu(pData->EndOfFile);
770 cifsInfo->time = jiffies;
771 atomic_inc(&cifsInfo->inUse);
772
773 /* save mtime and size */
774 local_mtime = tmp_inode->i_mtime;
775 local_size = tmp_inode->i_size;
776
777 tmp_inode->i_atime =
778 cifs_NTtimeToUnix(le64_to_cpu(pData->LastAccessTime));
779 tmp_inode->i_mtime =
780 cifs_NTtimeToUnix(le64_to_cpu(pData->LastModificationTime));
781 tmp_inode->i_ctime =
782 cifs_NTtimeToUnix(le64_to_cpu(pData->LastStatusChange));
783
784 tmp_inode->i_mode = le64_to_cpu(pData->Permissions);
785 /* since we set the inode type below we need to mask off type
786 to avoid strange results if bits above were corrupt */
787 tmp_inode->i_mode &= ~S_IFMT;
788 if (type == UNIX_FILE) {
789 *pobject_type = DT_REG;
790 tmp_inode->i_mode |= S_IFREG;
791 } else if (type == UNIX_SYMLINK) {
792 *pobject_type = DT_LNK;
793 tmp_inode->i_mode |= S_IFLNK;
794 } else if (type == UNIX_DIR) {
795 *pobject_type = DT_DIR;
796 tmp_inode->i_mode |= S_IFDIR;
797 } else if (type == UNIX_CHARDEV) {
798 *pobject_type = DT_CHR;
799 tmp_inode->i_mode |= S_IFCHR;
800 tmp_inode->i_rdev = MKDEV(le64_to_cpu(pData->DevMajor),
801 le64_to_cpu(pData->DevMinor) & MINORMASK);
802 } else if (type == UNIX_BLOCKDEV) {
803 *pobject_type = DT_BLK;
804 tmp_inode->i_mode |= S_IFBLK;
805 tmp_inode->i_rdev = MKDEV(le64_to_cpu(pData->DevMajor),
806 le64_to_cpu(pData->DevMinor) & MINORMASK);
807 } else if (type == UNIX_FIFO) {
808 *pobject_type = DT_FIFO;
809 tmp_inode->i_mode |= S_IFIFO;
810 } else if (type == UNIX_SOCKET) {
811 *pobject_type = DT_SOCK;
812 tmp_inode->i_mode |= S_IFSOCK;
813 } else {
814 /* safest to just call it a file */
815 *pobject_type = DT_REG;
816 tmp_inode->i_mode |= S_IFREG;
817 cFYI(1, ("unknown inode type %d", type));
818 }
819
820 #ifdef CONFIG_CIFS_DEBUG2
821 cFYI(1, ("object type: %d", type));
822 #endif
823 tmp_inode->i_uid = le64_to_cpu(pData->Uid);
824 tmp_inode->i_gid = le64_to_cpu(pData->Gid);
825 tmp_inode->i_nlink = le64_to_cpu(pData->Nlinks);
826
827 spin_lock(&tmp_inode->i_lock);
828 if (is_size_safe_to_change(cifsInfo, end_of_file)) {
829 /* can not safely change the file size here if the
830 client is writing to it due to potential races */
831 i_size_write(tmp_inode, end_of_file);
832
833 /* 512 bytes (2**9) is the fake blocksize that must be used */
834 /* for this calculation, not the real blocksize */
835 tmp_inode->i_blocks = (512 - 1 + num_of_bytes) >> 9;
836 }
837 spin_unlock(&tmp_inode->i_lock);
838
839 if (S_ISREG(tmp_inode->i_mode)) {
840 cFYI(1, ("File inode"));
841 tmp_inode->i_op = &cifs_file_inode_ops;
842
843 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DIRECT_IO) {
844 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_BRL)
845 tmp_inode->i_fop = &cifs_file_direct_nobrl_ops;
846 else
847 tmp_inode->i_fop = &cifs_file_direct_ops;
848
849 } else if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_BRL)
850 tmp_inode->i_fop = &cifs_file_nobrl_ops;
851 else
852 tmp_inode->i_fop = &cifs_file_ops;
853
854 if ((cifs_sb->tcon) && (cifs_sb->tcon->ses) &&
855 (cifs_sb->tcon->ses->server->maxBuf <
856 PAGE_CACHE_SIZE + MAX_CIFS_HDR_SIZE))
857 tmp_inode->i_data.a_ops = &cifs_addr_ops_smallbuf;
858 else
859 tmp_inode->i_data.a_ops = &cifs_addr_ops;
860
861 if (isNewInode)
862 return; /* No sense invalidating pages for new inode
863 since we we have not started caching
864 readahead file data yet */
865
866 if (timespec_equal(&tmp_inode->i_mtime, &local_mtime) &&
867 (local_size == tmp_inode->i_size)) {
868 cFYI(1, ("inode exists but unchanged"));
869 } else {
870 /* file may have changed on server */
871 cFYI(1, ("invalidate inode, readdir detected change"));
872 invalidate_remote_inode(tmp_inode);
873 }
874 } else if (S_ISDIR(tmp_inode->i_mode)) {
875 cFYI(1, ("Directory inode"));
876 tmp_inode->i_op = &cifs_dir_inode_ops;
877 tmp_inode->i_fop = &cifs_dir_ops;
878 } else if (S_ISLNK(tmp_inode->i_mode)) {
879 cFYI(1, ("Symbolic Link inode"));
880 tmp_inode->i_op = &cifs_symlink_inode_ops;
881 /* tmp_inode->i_fop = *//* do not need to set to anything */
882 } else {
883 cFYI(1, ("Special inode"));
884 init_special_inode(tmp_inode, tmp_inode->i_mode,
885 tmp_inode->i_rdev);
886 }
887 }
888
889 int cifs_mkdir(struct inode *inode, struct dentry *direntry, int mode)
890 {
891 int rc = 0;
892 int xid;
893 struct cifs_sb_info *cifs_sb;
894 struct cifsTconInfo *pTcon;
895 char *full_path = NULL;
896 struct inode *newinode = NULL;
897
898 cFYI(1, ("In cifs_mkdir, mode = 0x%x inode = 0x%p", mode, inode));
899
900 xid = GetXid();
901
902 cifs_sb = CIFS_SB(inode->i_sb);
903 pTcon = cifs_sb->tcon;
904
905 full_path = build_path_from_dentry(direntry);
906 if (full_path == NULL) {
907 FreeXid(xid);
908 return -ENOMEM;
909 }
910
911 if ((pTcon->ses->capabilities & CAP_UNIX) &&
912 (CIFS_UNIX_POSIX_PATH_OPS_CAP &
913 le64_to_cpu(pTcon->fsUnixInfo.Capability))) {
914 u32 oplock = 0;
915 FILE_UNIX_BASIC_INFO * pInfo =
916 kzalloc(sizeof(FILE_UNIX_BASIC_INFO), GFP_KERNEL);
917 if (pInfo == NULL) {
918 rc = -ENOMEM;
919 goto mkdir_out;
920 }
921
922 rc = CIFSPOSIXCreate(xid, pTcon, SMB_O_DIRECTORY | SMB_O_CREAT,
923 mode, NULL /* netfid */, pInfo, &oplock,
924 full_path, cifs_sb->local_nls,
925 cifs_sb->mnt_cifs_flags &
926 CIFS_MOUNT_MAP_SPECIAL_CHR);
927 if (rc) {
928 cFYI(1, ("posix mkdir returned 0x%x", rc));
929 d_drop(direntry);
930 } else {
931 int obj_type;
932 if (pInfo->Type == -1) /* no return info - go query */
933 goto mkdir_get_info;
934 /*BB check (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SET_UID ) to see if need
935 to set uid/gid */
936 inc_nlink(inode);
937 if (pTcon->nocase)
938 direntry->d_op = &cifs_ci_dentry_ops;
939 else
940 direntry->d_op = &cifs_dentry_ops;
941
942 newinode = new_inode(inode->i_sb);
943 if (newinode == NULL)
944 goto mkdir_get_info;
945 /* Is an i_ino of zero legal? */
946 /* Are there sanity checks we can use to ensure that
947 the server is really filling in that field? */
948 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM) {
949 newinode->i_ino =
950 (unsigned long)pInfo->UniqueId;
951 } /* note ino incremented to unique num in new_inode */
952 if (inode->i_sb->s_flags & MS_NOATIME)
953 newinode->i_flags |= S_NOATIME | S_NOCMTIME;
954 newinode->i_nlink = 2;
955
956 insert_inode_hash(newinode);
957 d_instantiate(direntry, newinode);
958
959 /* we already checked in POSIXCreate whether
960 frame was long enough */
961 posix_fill_in_inode(direntry->d_inode,
962 pInfo, &obj_type, 1 /* NewInode */);
963 #ifdef CONFIG_CIFS_DEBUG2
964 cFYI(1, ("instantiated dentry %p %s to inode %p",
965 direntry, direntry->d_name.name, newinode));
966
967 if (newinode->i_nlink != 2)
968 cFYI(1, ("unexpected number of links %d",
969 newinode->i_nlink));
970 #endif
971 }
972 kfree(pInfo);
973 goto mkdir_out;
974 }
975
976 /* BB add setting the equivalent of mode via CreateX w/ACLs */
977 rc = CIFSSMBMkDir(xid, pTcon, full_path, cifs_sb->local_nls,
978 cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR);
979 if (rc) {
980 cFYI(1, ("cifs_mkdir returned 0x%x", rc));
981 d_drop(direntry);
982 } else {
983 mkdir_get_info:
984 inc_nlink(inode);
985 if (pTcon->unix_ext)
986 rc = cifs_get_inode_info_unix(&newinode, full_path,
987 inode->i_sb, xid);
988 else
989 rc = cifs_get_inode_info(&newinode, full_path, NULL,
990 inode->i_sb, xid);
991
992 if (pTcon->nocase)
993 direntry->d_op = &cifs_ci_dentry_ops;
994 else
995 direntry->d_op = &cifs_dentry_ops;
996 d_instantiate(direntry, newinode);
997 /* setting nlink not necessary except in cases where we
998 * failed to get it from the server or was set bogus */
999 if ((direntry->d_inode) && (direntry->d_inode->i_nlink < 2))
1000 direntry->d_inode->i_nlink = 2;
1001 if (pTcon->unix_ext) {
1002 mode &= ~current->fs->umask;
1003 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SET_UID) {
1004 CIFSSMBUnixSetPerms(xid, pTcon, full_path,
1005 mode,
1006 (__u64)current->fsuid,
1007 (__u64)current->fsgid,
1008 0 /* dev_t */,
1009 cifs_sb->local_nls,
1010 cifs_sb->mnt_cifs_flags &
1011 CIFS_MOUNT_MAP_SPECIAL_CHR);
1012 } else {
1013 CIFSSMBUnixSetPerms(xid, pTcon, full_path,
1014 mode, (__u64)-1,
1015 (__u64)-1, 0 /* dev_t */,
1016 cifs_sb->local_nls,
1017 cifs_sb->mnt_cifs_flags &
1018 CIFS_MOUNT_MAP_SPECIAL_CHR);
1019 }
1020 } else {
1021 /* BB to be implemented via Windows secrty descriptors
1022 eg CIFSSMBWinSetPerms(xid, pTcon, full_path, mode,
1023 -1, -1, local_nls); */
1024 if (direntry->d_inode) {
1025 direntry->d_inode->i_mode = mode;
1026 direntry->d_inode->i_mode |= S_IFDIR;
1027 if (cifs_sb->mnt_cifs_flags &
1028 CIFS_MOUNT_SET_UID) {
1029 direntry->d_inode->i_uid =
1030 current->fsuid;
1031 direntry->d_inode->i_gid =
1032 current->fsgid;
1033 }
1034 }
1035 }
1036 }
1037 mkdir_out:
1038 kfree(full_path);
1039 FreeXid(xid);
1040 return rc;
1041 }
1042
1043 int cifs_rmdir(struct inode *inode, struct dentry *direntry)
1044 {
1045 int rc = 0;
1046 int xid;
1047 struct cifs_sb_info *cifs_sb;
1048 struct cifsTconInfo *pTcon;
1049 char *full_path = NULL;
1050 struct cifsInodeInfo *cifsInode;
1051
1052 cFYI(1, ("cifs_rmdir, inode = 0x%p", inode));
1053
1054 xid = GetXid();
1055
1056 cifs_sb = CIFS_SB(inode->i_sb);
1057 pTcon = cifs_sb->tcon;
1058
1059 full_path = build_path_from_dentry(direntry);
1060 if (full_path == NULL) {
1061 FreeXid(xid);
1062 return -ENOMEM;
1063 }
1064
1065 rc = CIFSSMBRmDir(xid, pTcon, full_path, cifs_sb->local_nls,
1066 cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR);
1067
1068 if (!rc) {
1069 drop_nlink(inode);
1070 spin_lock(&direntry->d_inode->i_lock);
1071 i_size_write(direntry->d_inode, 0);
1072 clear_nlink(direntry->d_inode);
1073 spin_unlock(&direntry->d_inode->i_lock);
1074 }
1075
1076 cifsInode = CIFS_I(direntry->d_inode);
1077 cifsInode->time = 0; /* force revalidate to go get info when
1078 needed */
1079 direntry->d_inode->i_ctime = inode->i_ctime = inode->i_mtime =
1080 current_fs_time(inode->i_sb);
1081
1082 kfree(full_path);
1083 FreeXid(xid);
1084 return rc;
1085 }
1086
1087 int cifs_rename(struct inode *source_inode, struct dentry *source_direntry,
1088 struct inode *target_inode, struct dentry *target_direntry)
1089 {
1090 char *fromName;
1091 char *toName;
1092 struct cifs_sb_info *cifs_sb_source;
1093 struct cifs_sb_info *cifs_sb_target;
1094 struct cifsTconInfo *pTcon;
1095 int xid;
1096 int rc = 0;
1097
1098 xid = GetXid();
1099
1100 cifs_sb_target = CIFS_SB(target_inode->i_sb);
1101 cifs_sb_source = CIFS_SB(source_inode->i_sb);
1102 pTcon = cifs_sb_source->tcon;
1103
1104 if (pTcon != cifs_sb_target->tcon) {
1105 FreeXid(xid);
1106 return -EXDEV; /* BB actually could be allowed if same server,
1107 but different share.
1108 Might eventually add support for this */
1109 }
1110
1111 /* we already have the rename sem so we do not need to grab it again
1112 here to protect the path integrity */
1113 fromName = build_path_from_dentry(source_direntry);
1114 toName = build_path_from_dentry(target_direntry);
1115 if ((fromName == NULL) || (toName == NULL)) {
1116 rc = -ENOMEM;
1117 goto cifs_rename_exit;
1118 }
1119
1120 rc = CIFSSMBRename(xid, pTcon, fromName, toName,
1121 cifs_sb_source->local_nls,
1122 cifs_sb_source->mnt_cifs_flags &
1123 CIFS_MOUNT_MAP_SPECIAL_CHR);
1124 if (rc == -EEXIST) {
1125 /* check if they are the same file because rename of hardlinked
1126 files is a noop */
1127 FILE_UNIX_BASIC_INFO *info_buf_source;
1128 FILE_UNIX_BASIC_INFO *info_buf_target;
1129
1130 info_buf_source =
1131 kmalloc(2 * sizeof(FILE_UNIX_BASIC_INFO), GFP_KERNEL);
1132 if (info_buf_source != NULL) {
1133 info_buf_target = info_buf_source + 1;
1134 if (pTcon->unix_ext)
1135 rc = CIFSSMBUnixQPathInfo(xid, pTcon, fromName,
1136 info_buf_source,
1137 cifs_sb_source->local_nls,
1138 cifs_sb_source->mnt_cifs_flags &
1139 CIFS_MOUNT_MAP_SPECIAL_CHR);
1140 /* else rc is still EEXIST so will fall through to
1141 unlink the target and retry rename */
1142 if (rc == 0) {
1143 rc = CIFSSMBUnixQPathInfo(xid, pTcon, toName,
1144 info_buf_target,
1145 cifs_sb_target->local_nls,
1146 /* remap based on source sb */
1147 cifs_sb_source->mnt_cifs_flags &
1148 CIFS_MOUNT_MAP_SPECIAL_CHR);
1149 }
1150 if ((rc == 0) &&
1151 (info_buf_source->UniqueId ==
1152 info_buf_target->UniqueId)) {
1153 /* do not rename since the files are hardlinked which
1154 is a noop */
1155 } else {
1156 /* we either can not tell the files are hardlinked
1157 (as with Windows servers) or files are not
1158 hardlinked so delete the target manually before
1159 renaming to follow POSIX rather than Windows
1160 semantics */
1161 cifs_unlink(target_inode, target_direntry);
1162 rc = CIFSSMBRename(xid, pTcon, fromName,
1163 toName,
1164 cifs_sb_source->local_nls,
1165 cifs_sb_source->mnt_cifs_flags
1166 & CIFS_MOUNT_MAP_SPECIAL_CHR);
1167 }
1168 kfree(info_buf_source);
1169 } /* if we can not get memory just leave rc as EEXIST */
1170 }
1171
1172 if (rc) {
1173 cFYI(1, ("rename rc %d", rc));
1174 }
1175
1176 if ((rc == -EIO) || (rc == -EEXIST)) {
1177 int oplock = FALSE;
1178 __u16 netfid;
1179
1180 /* BB FIXME Is Generic Read correct for rename? */
1181 /* if renaming directory - we should not say CREATE_NOT_DIR,
1182 need to test renaming open directory, also GENERIC_READ
1183 might not right be right access to request */
1184 rc = CIFSSMBOpen(xid, pTcon, fromName, FILE_OPEN, GENERIC_READ,
1185 CREATE_NOT_DIR, &netfid, &oplock, NULL,
1186 cifs_sb_source->local_nls,
1187 cifs_sb_source->mnt_cifs_flags &
1188 CIFS_MOUNT_MAP_SPECIAL_CHR);
1189 if (rc == 0) {
1190 rc = CIFSSMBRenameOpenFile(xid, pTcon, netfid, toName,
1191 cifs_sb_source->local_nls,
1192 cifs_sb_source->mnt_cifs_flags &
1193 CIFS_MOUNT_MAP_SPECIAL_CHR);
1194 CIFSSMBClose(xid, pTcon, netfid);
1195 }
1196 }
1197
1198 cifs_rename_exit:
1199 kfree(fromName);
1200 kfree(toName);
1201 FreeXid(xid);
1202 return rc;
1203 }
1204
1205 int cifs_revalidate(struct dentry *direntry)
1206 {
1207 int xid;
1208 int rc = 0;
1209 char *full_path;
1210 struct cifs_sb_info *cifs_sb;
1211 struct cifsInodeInfo *cifsInode;
1212 loff_t local_size;
1213 struct timespec local_mtime;
1214 int invalidate_inode = FALSE;
1215
1216 if (direntry->d_inode == NULL)
1217 return -ENOENT;
1218
1219 cifsInode = CIFS_I(direntry->d_inode);
1220
1221 if (cifsInode == NULL)
1222 return -ENOENT;
1223
1224 /* no sense revalidating inode info on file that no one can write */
1225 if (CIFS_I(direntry->d_inode)->clientCanCacheRead)
1226 return rc;
1227
1228 xid = GetXid();
1229
1230 cifs_sb = CIFS_SB(direntry->d_sb);
1231
1232 /* can not safely grab the rename sem here if rename calls revalidate
1233 since that would deadlock */
1234 full_path = build_path_from_dentry(direntry);
1235 if (full_path == NULL) {
1236 FreeXid(xid);
1237 return -ENOMEM;
1238 }
1239 cFYI(1, ("Revalidate: %s inode 0x%p count %d dentry: 0x%p d_time %ld "
1240 "jiffies %ld", full_path, direntry->d_inode,
1241 direntry->d_inode->i_count.counter, direntry,
1242 direntry->d_time, jiffies));
1243
1244 if (cifsInode->time == 0) {
1245 /* was set to zero previously to force revalidate */
1246 } else if (time_before(jiffies, cifsInode->time + HZ) &&
1247 lookupCacheEnabled) {
1248 if ((S_ISREG(direntry->d_inode->i_mode) == 0) ||
1249 (direntry->d_inode->i_nlink == 1)) {
1250 kfree(full_path);
1251 FreeXid(xid);
1252 return rc;
1253 } else {
1254 cFYI(1, ("Have to revalidate file due to hardlinks"));
1255 }
1256 }
1257
1258 /* save mtime and size */
1259 local_mtime = direntry->d_inode->i_mtime;
1260 local_size = direntry->d_inode->i_size;
1261
1262 if (cifs_sb->tcon->unix_ext) {
1263 rc = cifs_get_inode_info_unix(&direntry->d_inode, full_path,
1264 direntry->d_sb, xid);
1265 if (rc) {
1266 cFYI(1, ("error on getting revalidate info %d", rc));
1267 /* if (rc != -ENOENT)
1268 rc = 0; */ /* BB should we cache info on
1269 certain errors? */
1270 }
1271 } else {
1272 rc = cifs_get_inode_info(&direntry->d_inode, full_path, NULL,
1273 direntry->d_sb, xid);
1274 if (rc) {
1275 cFYI(1, ("error on getting revalidate info %d", rc));
1276 /* if (rc != -ENOENT)
1277 rc = 0; */ /* BB should we cache info on
1278 certain errors? */
1279 }
1280 }
1281 /* should we remap certain errors, access denied?, to zero */
1282
1283 /* if not oplocked, we invalidate inode pages if mtime or file size
1284 had changed on server */
1285
1286 if (timespec_equal(&local_mtime, &direntry->d_inode->i_mtime) &&
1287 (local_size == direntry->d_inode->i_size)) {
1288 cFYI(1, ("cifs_revalidate - inode unchanged"));
1289 } else {
1290 /* file may have changed on server */
1291 if (cifsInode->clientCanCacheRead) {
1292 /* no need to invalidate inode pages since we were the
1293 only ones who could have modified the file and the
1294 server copy is staler than ours */
1295 } else {
1296 invalidate_inode = TRUE;
1297 }
1298 }
1299
1300 /* can not grab this sem since kernel filesys locking documentation
1301 indicates i_mutex may be taken by the kernel on lookup and rename
1302 which could deadlock if we grab the i_mutex here as well */
1303 /* mutex_lock(&direntry->d_inode->i_mutex);*/
1304 /* need to write out dirty pages here */
1305 if (direntry->d_inode->i_mapping) {
1306 /* do we need to lock inode until after invalidate completes
1307 below? */
1308 filemap_fdatawrite(direntry->d_inode->i_mapping);
1309 }
1310 if (invalidate_inode) {
1311 /* shrink_dcache not necessary now that cifs dentry ops
1312 are exported for negative dentries */
1313 /* if (S_ISDIR(direntry->d_inode->i_mode))
1314 shrink_dcache_parent(direntry); */
1315 if (S_ISREG(direntry->d_inode->i_mode)) {
1316 if (direntry->d_inode->i_mapping)
1317 filemap_fdatawait(direntry->d_inode->i_mapping);
1318 /* may eventually have to do this for open files too */
1319 if (list_empty(&(cifsInode->openFileList))) {
1320 /* changed on server - flush read ahead pages */
1321 cFYI(1, ("Invalidating read ahead data on "
1322 "closed file"));
1323 invalidate_remote_inode(direntry->d_inode);
1324 }
1325 }
1326 }
1327 /* mutex_unlock(&direntry->d_inode->i_mutex); */
1328
1329 kfree(full_path);
1330 FreeXid(xid);
1331 return rc;
1332 }
1333
1334 int cifs_getattr(struct vfsmount *mnt, struct dentry *dentry,
1335 struct kstat *stat)
1336 {
1337 int err = cifs_revalidate(dentry);
1338 if (!err) {
1339 generic_fillattr(dentry->d_inode, stat);
1340 stat->blksize = CIFS_MAX_MSGSIZE;
1341 }
1342 return err;
1343 }
1344
1345 static int cifs_truncate_page(struct address_space *mapping, loff_t from)
1346 {
1347 pgoff_t index = from >> PAGE_CACHE_SHIFT;
1348 unsigned offset = from & (PAGE_CACHE_SIZE - 1);
1349 struct page *page;
1350 int rc = 0;
1351
1352 page = grab_cache_page(mapping, index);
1353 if (!page)
1354 return -ENOMEM;
1355
1356 zero_user_page(page, offset, PAGE_CACHE_SIZE - offset, KM_USER0);
1357 unlock_page(page);
1358 page_cache_release(page);
1359 return rc;
1360 }
1361
1362 static int cifs_vmtruncate(struct inode *inode, loff_t offset)
1363 {
1364 struct address_space *mapping = inode->i_mapping;
1365 unsigned long limit;
1366
1367 spin_lock(&inode->i_lock);
1368 if (inode->i_size < offset)
1369 goto do_expand;
1370 /*
1371 * truncation of in-use swapfiles is disallowed - it would cause
1372 * subsequent swapout to scribble on the now-freed blocks.
1373 */
1374 if (IS_SWAPFILE(inode)) {
1375 spin_unlock(&inode->i_lock);
1376 goto out_busy;
1377 }
1378 i_size_write(inode, offset);
1379 spin_unlock(&inode->i_lock);
1380 unmap_mapping_range(mapping, offset + PAGE_SIZE - 1, 0, 1);
1381 truncate_inode_pages(mapping, offset);
1382 goto out_truncate;
1383
1384 do_expand:
1385 limit = current->signal->rlim[RLIMIT_FSIZE].rlim_cur;
1386 if (limit != RLIM_INFINITY && offset > limit) {
1387 spin_unlock(&inode->i_lock);
1388 goto out_sig;
1389 }
1390 if (offset > inode->i_sb->s_maxbytes) {
1391 spin_unlock(&inode->i_lock);
1392 goto out_big;
1393 }
1394 i_size_write(inode, offset);
1395 spin_unlock(&inode->i_lock);
1396 out_truncate:
1397 if (inode->i_op && inode->i_op->truncate)
1398 inode->i_op->truncate(inode);
1399 return 0;
1400 out_sig:
1401 send_sig(SIGXFSZ, current, 0);
1402 out_big:
1403 return -EFBIG;
1404 out_busy:
1405 return -ETXTBSY;
1406 }
1407
1408 int cifs_setattr(struct dentry *direntry, struct iattr *attrs)
1409 {
1410 int xid;
1411 struct cifs_sb_info *cifs_sb;
1412 struct cifsTconInfo *pTcon;
1413 char *full_path = NULL;
1414 int rc = -EACCES;
1415 struct cifsFileInfo *open_file = NULL;
1416 FILE_BASIC_INFO time_buf;
1417 int set_time = FALSE;
1418 int set_dosattr = FALSE;
1419 __u64 mode = 0xFFFFFFFFFFFFFFFFULL;
1420 __u64 uid = 0xFFFFFFFFFFFFFFFFULL;
1421 __u64 gid = 0xFFFFFFFFFFFFFFFFULL;
1422 struct cifsInodeInfo *cifsInode;
1423
1424 xid = GetXid();
1425
1426 cFYI(1, ("setattr on file %s attrs->iavalid 0x%x",
1427 direntry->d_name.name, attrs->ia_valid));
1428
1429 cifs_sb = CIFS_SB(direntry->d_inode->i_sb);
1430 pTcon = cifs_sb->tcon;
1431
1432 if ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_PERM) == 0) {
1433 /* check if we have permission to change attrs */
1434 rc = inode_change_ok(direntry->d_inode, attrs);
1435 if (rc < 0) {
1436 FreeXid(xid);
1437 return rc;
1438 } else
1439 rc = 0;
1440 }
1441
1442 full_path = build_path_from_dentry(direntry);
1443 if (full_path == NULL) {
1444 FreeXid(xid);
1445 return -ENOMEM;
1446 }
1447 cifsInode = CIFS_I(direntry->d_inode);
1448
1449 /* BB check if we need to refresh inode from server now ? BB */
1450
1451 /* need to flush data before changing file size on server */
1452 filemap_write_and_wait(direntry->d_inode->i_mapping);
1453
1454 if (attrs->ia_valid & ATTR_SIZE) {
1455 /* To avoid spurious oplock breaks from server, in the case of
1456 inodes that we already have open, avoid doing path based
1457 setting of file size if we can do it by handle.
1458 This keeps our caching token (oplock) and avoids timeouts
1459 when the local oplock break takes longer to flush
1460 writebehind data than the SMB timeout for the SetPathInfo
1461 request would allow */
1462
1463 open_file = find_writable_file(cifsInode);
1464 if (open_file) {
1465 __u16 nfid = open_file->netfid;
1466 __u32 npid = open_file->pid;
1467 rc = CIFSSMBSetFileSize(xid, pTcon, attrs->ia_size,
1468 nfid, npid, FALSE);
1469 atomic_dec(&open_file->wrtPending);
1470 cFYI(1, ("SetFSize for attrs rc = %d", rc));
1471 if ((rc == -EINVAL) || (rc == -EOPNOTSUPP)) {
1472 int bytes_written;
1473 rc = CIFSSMBWrite(xid, pTcon,
1474 nfid, 0, attrs->ia_size,
1475 &bytes_written, NULL, NULL,
1476 1 /* 45 seconds */);
1477 cFYI(1, ("Wrt seteof rc %d", rc));
1478 }
1479 } else
1480 rc = -EINVAL;
1481
1482 if (rc != 0) {
1483 /* Set file size by pathname rather than by handle
1484 either because no valid, writeable file handle for
1485 it was found or because there was an error setting
1486 it by handle */
1487 rc = CIFSSMBSetEOF(xid, pTcon, full_path,
1488 attrs->ia_size, FALSE,
1489 cifs_sb->local_nls,
1490 cifs_sb->mnt_cifs_flags &
1491 CIFS_MOUNT_MAP_SPECIAL_CHR);
1492 cFYI(1, ("SetEOF by path (setattrs) rc = %d", rc));
1493 if ((rc == -EINVAL) || (rc == -EOPNOTSUPP)) {
1494 __u16 netfid;
1495 int oplock = FALSE;
1496
1497 rc = SMBLegacyOpen(xid, pTcon, full_path,
1498 FILE_OPEN,
1499 SYNCHRONIZE | FILE_WRITE_ATTRIBUTES,
1500 CREATE_NOT_DIR, &netfid, &oplock,
1501 NULL, cifs_sb->local_nls,
1502 cifs_sb->mnt_cifs_flags &
1503 CIFS_MOUNT_MAP_SPECIAL_CHR);
1504 if (rc == 0) {
1505 int bytes_written;
1506 rc = CIFSSMBWrite(xid, pTcon,
1507 netfid, 0,
1508 attrs->ia_size,
1509 &bytes_written, NULL,
1510 NULL, 1 /* 45 sec */);
1511 cFYI(1, ("wrt seteof rc %d", rc));
1512 CIFSSMBClose(xid, pTcon, netfid);
1513 }
1514
1515 }
1516 }
1517
1518 /* Server is ok setting allocation size implicitly - no need
1519 to call:
1520 CIFSSMBSetEOF(xid, pTcon, full_path, attrs->ia_size, TRUE,
1521 cifs_sb->local_nls);
1522 */
1523
1524 if (rc == 0) {
1525 rc = cifs_vmtruncate(direntry->d_inode, attrs->ia_size);
1526 cifs_truncate_page(direntry->d_inode->i_mapping,
1527 direntry->d_inode->i_size);
1528 } else
1529 goto cifs_setattr_exit;
1530 }
1531 if (attrs->ia_valid & ATTR_UID) {
1532 cFYI(1, ("UID changed to %d", attrs->ia_uid));
1533 uid = attrs->ia_uid;
1534 }
1535 if (attrs->ia_valid & ATTR_GID) {
1536 cFYI(1, ("GID changed to %d", attrs->ia_gid));
1537 gid = attrs->ia_gid;
1538 }
1539
1540 time_buf.Attributes = 0;
1541 if (attrs->ia_valid & ATTR_MODE) {
1542 cFYI(1, ("Mode changed to 0x%x", attrs->ia_mode));
1543 mode = attrs->ia_mode;
1544 }
1545
1546 if ((pTcon->unix_ext)
1547 && (attrs->ia_valid & (ATTR_MODE | ATTR_GID | ATTR_UID)))
1548 rc = CIFSSMBUnixSetPerms(xid, pTcon, full_path, mode, uid, gid,
1549 0 /* dev_t */, cifs_sb->local_nls,
1550 cifs_sb->mnt_cifs_flags &
1551 CIFS_MOUNT_MAP_SPECIAL_CHR);
1552 else if (attrs->ia_valid & ATTR_MODE) {
1553 rc = 0;
1554 if ((mode & S_IWUGO) == 0) /* not writeable */ {
1555 if ((cifsInode->cifsAttrs & ATTR_READONLY) == 0) {
1556 set_dosattr = TRUE;
1557 time_buf.Attributes =
1558 cpu_to_le32(cifsInode->cifsAttrs |
1559 ATTR_READONLY);
1560 }
1561 } else if (cifsInode->cifsAttrs & ATTR_READONLY) {
1562 /* If file is readonly on server, we would
1563 not be able to write to it - so if any write
1564 bit is enabled for user or group or other we
1565 need to at least try to remove r/o dos attr */
1566 set_dosattr = TRUE;
1567 time_buf.Attributes = cpu_to_le32(cifsInode->cifsAttrs &
1568 (~ATTR_READONLY));
1569 /* Windows ignores set to zero */
1570 if (time_buf.Attributes == 0)
1571 time_buf.Attributes |= cpu_to_le32(ATTR_NORMAL);
1572 }
1573 /* BB to be implemented -
1574 via Windows security descriptors or streams */
1575 /* CIFSSMBWinSetPerms(xid, pTcon, full_path, mode, uid, gid,
1576 cifs_sb->local_nls); */
1577 }
1578
1579 if (attrs->ia_valid & ATTR_ATIME) {
1580 set_time = TRUE;
1581 time_buf.LastAccessTime =
1582 cpu_to_le64(cifs_UnixTimeToNT(attrs->ia_atime));
1583 } else
1584 time_buf.LastAccessTime = 0;
1585
1586 if (attrs->ia_valid & ATTR_MTIME) {
1587 set_time = TRUE;
1588 time_buf.LastWriteTime =
1589 cpu_to_le64(cifs_UnixTimeToNT(attrs->ia_mtime));
1590 } else
1591 time_buf.LastWriteTime = 0;
1592 /* Do not set ctime explicitly unless other time
1593 stamps are changed explicitly (i.e. by utime()
1594 since we would then have a mix of client and
1595 server times */
1596
1597 if (set_time && (attrs->ia_valid & ATTR_CTIME)) {
1598 set_time = TRUE;
1599 /* Although Samba throws this field away
1600 it may be useful to Windows - but we do
1601 not want to set ctime unless some other
1602 timestamp is changing */
1603 cFYI(1, ("CIFS - CTIME changed"));
1604 time_buf.ChangeTime =
1605 cpu_to_le64(cifs_UnixTimeToNT(attrs->ia_ctime));
1606 } else
1607 time_buf.ChangeTime = 0;
1608
1609 if (set_time || set_dosattr) {
1610 time_buf.CreationTime = 0; /* do not change */
1611 /* In the future we should experiment - try setting timestamps
1612 via Handle (SetFileInfo) instead of by path */
1613 if (!(pTcon->ses->flags & CIFS_SES_NT4))
1614 rc = CIFSSMBSetTimes(xid, pTcon, full_path, &time_buf,
1615 cifs_sb->local_nls,
1616 cifs_sb->mnt_cifs_flags &
1617 CIFS_MOUNT_MAP_SPECIAL_CHR);
1618 else
1619 rc = -EOPNOTSUPP;
1620
1621 if (rc == -EOPNOTSUPP) {
1622 int oplock = FALSE;
1623 __u16 netfid;
1624
1625 cFYI(1, ("calling SetFileInfo since SetPathInfo for "
1626 "times not supported by this server"));
1627 /* BB we could scan to see if we already have it open
1628 and pass in pid of opener to function */
1629 rc = CIFSSMBOpen(xid, pTcon, full_path, FILE_OPEN,
1630 SYNCHRONIZE | FILE_WRITE_ATTRIBUTES,
1631 CREATE_NOT_DIR, &netfid, &oplock,
1632 NULL, cifs_sb->local_nls,
1633 cifs_sb->mnt_cifs_flags &
1634 CIFS_MOUNT_MAP_SPECIAL_CHR);
1635 if (rc == 0) {
1636 rc = CIFSSMBSetFileTimes(xid, pTcon, &time_buf,
1637 netfid);
1638 CIFSSMBClose(xid, pTcon, netfid);
1639 } else {
1640 /* BB For even older servers we could convert time_buf
1641 into old DOS style which uses two second
1642 granularity */
1643
1644 /* rc = CIFSSMBSetTimesLegacy(xid, pTcon, full_path,
1645 &time_buf, cifs_sb->local_nls); */
1646 }
1647 }
1648 /* Even if error on time set, no sense failing the call if
1649 the server would set the time to a reasonable value anyway,
1650 and this check ensures that we are not being called from
1651 sys_utimes in which case we ought to fail the call back to
1652 the user when the server rejects the call */
1653 if ((rc) && (attrs->ia_valid &
1654 (ATTR_MODE | ATTR_GID | ATTR_UID | ATTR_SIZE)))
1655 rc = 0;
1656 }
1657
1658 /* do not need local check to inode_check_ok since the server does
1659 that */
1660 if (!rc)
1661 rc = inode_setattr(direntry->d_inode, attrs);
1662 cifs_setattr_exit:
1663 kfree(full_path);
1664 FreeXid(xid);
1665 return rc;
1666 }
1667
1668 #if 0
1669 void cifs_delete_inode(struct inode *inode)
1670 {
1671 cFYI(1, ("In cifs_delete_inode, inode = 0x%p", inode));
1672 /* may have to add back in if and when safe distributed caching of
1673 directories added e.g. via FindNotify */
1674 }
1675 #endif
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