projects / deliverable / linux.git / blob
? search:
summary | shortlog | log | commit | commitdiff | tree
blame | history | raw | HEAD
Merge master.kernel.org:/pub/scm/linux/kernel/git/davem/net-2.6
[deliverable/linux.git] / fs / cifs / inode.c
1 /*
2 * fs/cifs/inode.c
3 *
4 * Copyright (C) International Business Machines Corp., 2002,2005
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 inode->i_uid = le64_to_cpu(findData.Uid);
143 inode->i_gid = le64_to_cpu(findData.Gid);
144 inode->i_nlink = le64_to_cpu(findData.Nlinks);
145
146 spin_lock(&inode->i_lock);
147 if (is_size_safe_to_change(cifsInfo, end_of_file)) {
148 /* can not safely change the file size here if the
149 client is writing to it due to potential races */
150 i_size_write(inode, end_of_file);
151
152 /* blksize needs to be multiple of two. So safer to default to
153 blksize and blkbits set in superblock so 2**blkbits and blksize
154 will match rather than setting to:
155 (pTcon->ses->server->maxBuf - MAX_CIFS_HDR_SIZE) & 0xFFFFFE00;*/
156
157 /* This seems incredibly stupid but it turns out that i_blocks
158 is not related to (i_size / i_blksize), instead 512 byte size
159 is required for calculating num blocks */
160
161 /* 512 bytes (2**9) is the fake blocksize that must be used */
162 /* for this calculation */
163 inode->i_blocks = (512 - 1 + num_of_bytes) >> 9;
164 }
165 spin_unlock(&inode->i_lock);
166
167 if (num_of_bytes < end_of_file)
168 cFYI(1, ("allocation size less than end of file"));
169 cFYI(1, ("Size %ld and blocks %llu",
170 (unsigned long) inode->i_size,
171 (unsigned long long)inode->i_blocks));
172 if (S_ISREG(inode->i_mode)) {
173 cFYI(1, ("File inode"));
174 inode->i_op = &cifs_file_inode_ops;
175 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DIRECT_IO) {
176 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_BRL)
177 inode->i_fop =
178 &cifs_file_direct_nobrl_ops;
179 else
180 inode->i_fop = &cifs_file_direct_ops;
181 } else if(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_BRL)
182 inode->i_fop = &cifs_file_nobrl_ops;
183 else /* not direct, send byte range locks */
184 inode->i_fop = &cifs_file_ops;
185
186 /* check if server can support readpages */
187 if(pTcon->ses->server->maxBuf <
188 PAGE_CACHE_SIZE + MAX_CIFS_HDR_SIZE)
189 inode->i_data.a_ops = &cifs_addr_ops_smallbuf;
190 else
191 inode->i_data.a_ops = &cifs_addr_ops;
192 } else if (S_ISDIR(inode->i_mode)) {
193 cFYI(1, ("Directory inode"));
194 inode->i_op = &cifs_dir_inode_ops;
195 inode->i_fop = &cifs_dir_ops;
196 } else if (S_ISLNK(inode->i_mode)) {
197 cFYI(1, ("Symbolic Link inode"));
198 inode->i_op = &cifs_symlink_inode_ops;
199 /* tmp_inode->i_fop = */ /* do not need to set to anything */
200 } else {
201 cFYI(1, ("Init special inode"));
202 init_special_inode(inode, inode->i_mode,
203 inode->i_rdev);
204 }
205 }
206 return rc;
207 }
208
209 static int decode_sfu_inode(struct inode * inode, __u64 size,
210 const unsigned char *path,
211 struct cifs_sb_info *cifs_sb, int xid)
212 {
213 int rc;
214 int oplock = FALSE;
215 __u16 netfid;
216 struct cifsTconInfo *pTcon = cifs_sb->tcon;
217 char buf[24];
218 unsigned int bytes_read;
219 char * pbuf;
220
221 pbuf = buf;
222
223 if(size == 0) {
224 inode->i_mode |= S_IFIFO;
225 return 0;
226 } else if (size < 8) {
227 return -EINVAL; /* EOPNOTSUPP? */
228 }
229
230 rc = CIFSSMBOpen(xid, pTcon, path, FILE_OPEN, GENERIC_READ,
231 CREATE_NOT_DIR, &netfid, &oplock, NULL,
232 cifs_sb->local_nls,
233 cifs_sb->mnt_cifs_flags &
234 CIFS_MOUNT_MAP_SPECIAL_CHR);
235 if (rc==0) {
236 int buf_type = CIFS_NO_BUFFER;
237 /* Read header */
238 rc = CIFSSMBRead(xid, pTcon,
239 netfid,
240 24 /* length */, 0 /* offset */,
241 &bytes_read, &pbuf, &buf_type);
242 if((rc == 0) && (bytes_read >= 8)) {
243 if(memcmp("IntxBLK", pbuf, 8) == 0) {
244 cFYI(1,("Block device"));
245 inode->i_mode |= S_IFBLK;
246 if(bytes_read == 24) {
247 /* we have enough to decode dev num */
248 __u64 mjr; /* major */
249 __u64 mnr; /* minor */
250 mjr = le64_to_cpu(*(__le64 *)(pbuf+8));
251 mnr = le64_to_cpu(*(__le64 *)(pbuf+16));
252 inode->i_rdev = MKDEV(mjr, mnr);
253 }
254 } else if(memcmp("IntxCHR", pbuf, 8) == 0) {
255 cFYI(1,("Char device"));
256 inode->i_mode |= S_IFCHR;
257 if(bytes_read == 24) {
258 /* we have enough to decode dev num */
259 __u64 mjr; /* major */
260 __u64 mnr; /* minor */
261 mjr = le64_to_cpu(*(__le64 *)(pbuf+8));
262 mnr = le64_to_cpu(*(__le64 *)(pbuf+16));
263 inode->i_rdev = MKDEV(mjr, mnr);
264 }
265 } else if(memcmp("IntxLNK", pbuf, 7) == 0) {
266 cFYI(1,("Symlink"));
267 inode->i_mode |= S_IFLNK;
268 } else {
269 inode->i_mode |= S_IFREG; /* file? */
270 rc = -EOPNOTSUPP;
271 }
272 } else {
273 inode->i_mode |= S_IFREG; /* then it is a file */
274 rc = -EOPNOTSUPP; /* or some unknown SFU type */
275 }
276 CIFSSMBClose(xid, pTcon, netfid);
277 }
278 return rc;
279
280 }
281
282 #define SFBITS_MASK (S_ISVTX | S_ISGID | S_ISUID) /* SETFILEBITS valid bits */
283
284 static int get_sfu_uid_mode(struct inode * inode,
285 const unsigned char *path,
286 struct cifs_sb_info *cifs_sb, int xid)
287 {
288 #ifdef CONFIG_CIFS_XATTR
289 ssize_t rc;
290 char ea_value[4];
291 __u32 mode;
292
293 rc = CIFSSMBQueryEA(xid, cifs_sb->tcon, path, "SETFILEBITS",
294 ea_value, 4 /* size of buf */, cifs_sb->local_nls,
295 cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR);
296 if(rc < 0)
297 return (int)rc;
298 else if (rc > 3) {
299 mode = le32_to_cpu(*((__le32 *)ea_value));
300 inode->i_mode &= ~SFBITS_MASK;
301 cFYI(1,("special bits 0%o org mode 0%o", mode, inode->i_mode));
302 inode->i_mode = (mode & SFBITS_MASK) | inode->i_mode;
303 cFYI(1,("special mode bits 0%o", mode));
304 return 0;
305 } else {
306 return 0;
307 }
308 #else
309 return -EOPNOTSUPP;
310 #endif
311
312
313 }
314
315 int cifs_get_inode_info(struct inode **pinode,
316 const unsigned char *search_path, FILE_ALL_INFO *pfindData,
317 struct super_block *sb, int xid)
318 {
319 int rc = 0;
320 struct cifsTconInfo *pTcon;
321 struct inode *inode;
322 struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
323 char *tmp_path;
324 char *buf = NULL;
325 int adjustTZ = FALSE;
326
327 pTcon = cifs_sb->tcon;
328 cFYI(1,("Getting info on %s", search_path));
329
330 if ((pfindData == NULL) && (*pinode != NULL)) {
331 if (CIFS_I(*pinode)->clientCanCacheRead) {
332 cFYI(1,("No need to revalidate cached inode sizes"));
333 return rc;
334 }
335 }
336
337 /* if file info not passed in then get it from server */
338 if (pfindData == NULL) {
339 buf = kmalloc(sizeof(FILE_ALL_INFO), GFP_KERNEL);
340 if (buf == NULL)
341 return -ENOMEM;
342 pfindData = (FILE_ALL_INFO *)buf;
343 /* could do find first instead but this returns more info */
344 rc = CIFSSMBQPathInfo(xid, pTcon, search_path, pfindData,
345 0 /* not legacy */,
346 cifs_sb->local_nls, cifs_sb->mnt_cifs_flags &
347 CIFS_MOUNT_MAP_SPECIAL_CHR);
348 /* BB optimize code so we do not make the above call
349 when server claims no NT SMB support and the above call
350 failed at least once - set flag in tcon or mount */
351 if((rc == -EOPNOTSUPP) || (rc == -EINVAL)) {
352 rc = SMBQueryInformation(xid, pTcon, search_path,
353 pfindData, cifs_sb->local_nls,
354 cifs_sb->mnt_cifs_flags &
355 CIFS_MOUNT_MAP_SPECIAL_CHR);
356 adjustTZ = TRUE;
357 }
358
359 }
360 /* dump_mem("\nQPathInfo return data",&findData, sizeof(findData)); */
361 if (rc) {
362 if (rc == -EREMOTE) {
363 tmp_path =
364 kmalloc(strnlen
365 (pTcon->treeName,
366 MAX_TREE_SIZE + 1) +
367 strnlen(search_path, MAX_PATHCONF) + 1,
368 GFP_KERNEL);
369 if (tmp_path == NULL) {
370 kfree(buf);
371 return -ENOMEM;
372 }
373
374 strncpy(tmp_path, pTcon->treeName, MAX_TREE_SIZE);
375 strncat(tmp_path, search_path, MAX_PATHCONF);
376 rc = connect_to_dfs_path(xid, pTcon->ses,
377 /* treename + */ tmp_path,
378 cifs_sb->local_nls,
379 cifs_sb->mnt_cifs_flags &
380 CIFS_MOUNT_MAP_SPECIAL_CHR);
381 kfree(tmp_path);
382 /* BB fix up inode etc. */
383 } else if (rc) {
384 kfree(buf);
385 return rc;
386 }
387 } else {
388 struct cifsInodeInfo *cifsInfo;
389 __u32 attr = le32_to_cpu(pfindData->Attributes);
390
391 /* get new inode */
392 if (*pinode == NULL) {
393 *pinode = new_inode(sb);
394 if (*pinode == NULL) {
395 kfree(buf);
396 return -ENOMEM;
397 }
398 /* Is an i_ino of zero legal? Can we use that to check
399 if the server supports returning inode numbers? Are
400 there other sanity checks we can use to ensure that
401 the server is really filling in that field? */
402
403 /* We can not use the IndexNumber field by default from
404 Windows or Samba (in ALL_INFO buf) but we can request
405 it explicitly. It may not be unique presumably if
406 the server has multiple devices mounted under one
407 share */
408
409 /* There may be higher info levels that work but are
410 there Windows server or network appliances for which
411 IndexNumber field is not guaranteed unique? */
412
413 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM){
414 int rc1 = 0;
415 __u64 inode_num;
416
417 rc1 = CIFSGetSrvInodeNumber(xid, pTcon,
418 search_path, &inode_num,
419 cifs_sb->local_nls,
420 cifs_sb->mnt_cifs_flags &
421 CIFS_MOUNT_MAP_SPECIAL_CHR);
422 if (rc1) {
423 cFYI(1,("GetSrvInodeNum rc %d", rc1));
424 /* BB EOPNOSUPP disable SERVER_INUM? */
425 } else /* do we need cast or hash to ino? */
426 (*pinode)->i_ino = inode_num;
427 } /* else ino incremented to unique num in new_inode*/
428 if(sb->s_flags & MS_NOATIME)
429 (*pinode)->i_flags |= S_NOATIME | S_NOCMTIME;
430 insert_inode_hash(*pinode);
431 }
432 inode = *pinode;
433 cifsInfo = CIFS_I(inode);
434 cifsInfo->cifsAttrs = attr;
435 cFYI(1, ("Old time %ld", cifsInfo->time));
436 cifsInfo->time = jiffies;
437 cFYI(1, ("New time %ld", cifsInfo->time));
438
439 /* blksize needs to be multiple of two. So safer to default to
440 blksize and blkbits set in superblock so 2**blkbits and blksize
441 will match rather than setting to:
442 (pTcon->ses->server->maxBuf - MAX_CIFS_HDR_SIZE) & 0xFFFFFE00;*/
443
444 /* Linux can not store file creation time so ignore it */
445 if(pfindData->LastAccessTime)
446 inode->i_atime = cifs_NTtimeToUnix
447 (le64_to_cpu(pfindData->LastAccessTime));
448 else /* do not need to use current_fs_time - time not stored */
449 inode->i_atime = CURRENT_TIME;
450 inode->i_mtime =
451 cifs_NTtimeToUnix(le64_to_cpu(pfindData->LastWriteTime));
452 inode->i_ctime =
453 cifs_NTtimeToUnix(le64_to_cpu(pfindData->ChangeTime));
454 cFYI(0, ("Attributes came in as 0x%x", attr));
455 if(adjustTZ && (pTcon->ses) && (pTcon->ses->server)) {
456 inode->i_ctime.tv_sec += pTcon->ses->server->timeAdj;
457 inode->i_mtime.tv_sec += pTcon->ses->server->timeAdj;
458 }
459
460 /* set default mode. will override for dirs below */
461 if (atomic_read(&cifsInfo->inUse) == 0)
462 /* new inode, can safely set these fields */
463 inode->i_mode = cifs_sb->mnt_file_mode;
464 else /* since we set the inode type below we need to mask off
465 to avoid strange results if type changes and both get orred in */
466 inode->i_mode &= ~S_IFMT;
467 /* if (attr & ATTR_REPARSE) */
468 /* We no longer handle these as symlinks because we could not
469 follow them due to the absolute path with drive letter */
470 if (attr & ATTR_DIRECTORY) {
471 /* override default perms since we do not do byte range locking
472 on dirs */
473 inode->i_mode = cifs_sb->mnt_dir_mode;
474 inode->i_mode |= S_IFDIR;
475 } else if ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_UNX_EMUL) &&
476 (cifsInfo->cifsAttrs & ATTR_SYSTEM) &&
477 /* No need to le64 convert size of zero */
478 (pfindData->EndOfFile == 0)) {
479 inode->i_mode = cifs_sb->mnt_file_mode;
480 inode->i_mode |= S_IFIFO;
481 /* BB Finish for SFU style symlinks and devices */
482 } else if ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_UNX_EMUL) &&
483 (cifsInfo->cifsAttrs & ATTR_SYSTEM)) {
484 if (decode_sfu_inode(inode,
485 le64_to_cpu(pfindData->EndOfFile),
486 search_path,
487 cifs_sb, xid)) {
488 cFYI(1,("Unrecognized sfu inode type"));
489 }
490 cFYI(1,("sfu mode 0%o",inode->i_mode));
491 } else {
492 inode->i_mode |= S_IFREG;
493 /* treat the dos attribute of read-only as read-only
494 mode e.g. 555 */
495 if (cifsInfo->cifsAttrs & ATTR_READONLY)
496 inode->i_mode &= ~(S_IWUGO);
497 /* BB add code here -
498 validate if device or weird share or device type? */
499 }
500
501 spin_lock(&inode->i_lock);
502 if (is_size_safe_to_change(cifsInfo, le64_to_cpu(pfindData->EndOfFile))) {
503 /* can not safely shrink the file size here if the
504 client is writing to it due to potential races */
505 i_size_write(inode,le64_to_cpu(pfindData->EndOfFile));
506
507 /* 512 bytes (2**9) is the fake blocksize that must be
508 used for this calculation */
509 inode->i_blocks = (512 - 1 + le64_to_cpu(
510 pfindData->AllocationSize)) >> 9;
511 }
512 spin_unlock(&inode->i_lock);
513
514 inode->i_nlink = le32_to_cpu(pfindData->NumberOfLinks);
515
516 /* BB fill in uid and gid here? with help from winbind?
517 or retrieve from NTFS stream extended attribute */
518 if(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_UNX_EMUL) {
519 /* fill in uid, gid, mode from server ACL */
520 get_sfu_uid_mode(inode, search_path, cifs_sb, xid);
521 } else if (atomic_read(&cifsInfo->inUse) == 0) {
522 inode->i_uid = cifs_sb->mnt_uid;
523 inode->i_gid = cifs_sb->mnt_gid;
524 /* set so we do not keep refreshing these fields with
525 bad data after user has changed them in memory */
526 atomic_set(&cifsInfo->inUse,1);
527 }
528
529 if (S_ISREG(inode->i_mode)) {
530 cFYI(1, ("File inode"));
531 inode->i_op = &cifs_file_inode_ops;
532 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DIRECT_IO) {
533 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_BRL)
534 inode->i_fop =
535 &cifs_file_direct_nobrl_ops;
536 else
537 inode->i_fop = &cifs_file_direct_ops;
538 } else if(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_BRL)
539 inode->i_fop = &cifs_file_nobrl_ops;
540 else /* not direct, send byte range locks */
541 inode->i_fop = &cifs_file_ops;
542
543 if(pTcon->ses->server->maxBuf <
544 PAGE_CACHE_SIZE + MAX_CIFS_HDR_SIZE)
545 inode->i_data.a_ops = &cifs_addr_ops_smallbuf;
546 else
547 inode->i_data.a_ops = &cifs_addr_ops;
548 } else if (S_ISDIR(inode->i_mode)) {
549 cFYI(1, ("Directory inode"));
550 inode->i_op = &cifs_dir_inode_ops;
551 inode->i_fop = &cifs_dir_ops;
552 } else if (S_ISLNK(inode->i_mode)) {
553 cFYI(1, ("Symbolic Link inode"));
554 inode->i_op = &cifs_symlink_inode_ops;
555 } else {
556 init_special_inode(inode, inode->i_mode,
557 inode->i_rdev);
558 }
559 }
560 kfree(buf);
561 return rc;
562 }
563
564 /* gets root inode */
565 void cifs_read_inode(struct inode *inode)
566 {
567 int xid;
568 struct cifs_sb_info *cifs_sb;
569
570 cifs_sb = CIFS_SB(inode->i_sb);
571 xid = GetXid();
572 if (cifs_sb->tcon->ses->capabilities & CAP_UNIX)
573 cifs_get_inode_info_unix(&inode, "", inode->i_sb,xid);
574 else
575 cifs_get_inode_info(&inode, "", NULL, inode->i_sb,xid);
576 /* can not call macro FreeXid here since in a void func */
577 _FreeXid(xid);
578 }
579
580 int cifs_unlink(struct inode *inode, struct dentry *direntry)
581 {
582 int rc = 0;
583 int xid;
584 struct cifs_sb_info *cifs_sb;
585 struct cifsTconInfo *pTcon;
586 char *full_path = NULL;
587 struct cifsInodeInfo *cifsInode;
588 FILE_BASIC_INFO *pinfo_buf;
589
590 cFYI(1, ("cifs_unlink, inode = 0x%p", inode));
591
592 xid = GetXid();
593
594 if(inode)
595 cifs_sb = CIFS_SB(inode->i_sb);
596 else
597 cifs_sb = CIFS_SB(direntry->d_sb);
598 pTcon = cifs_sb->tcon;
599
600 /* Unlink can be called from rename so we can not grab the sem here
601 since we deadlock otherwise */
602 /* mutex_lock(&direntry->d_sb->s_vfs_rename_mutex);*/
603 full_path = build_path_from_dentry(direntry);
604 /* mutex_unlock(&direntry->d_sb->s_vfs_rename_mutex);*/
605 if (full_path == NULL) {
606 FreeXid(xid);
607 return -ENOMEM;
608 }
609 rc = CIFSSMBDelFile(xid, pTcon, full_path, cifs_sb->local_nls,
610 cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR);
611
612 if (!rc) {
613 if (direntry->d_inode)
614 drop_nlink(direntry->d_inode);
615 } else if (rc == -ENOENT) {
616 d_drop(direntry);
617 } else if (rc == -ETXTBSY) {
618 int oplock = FALSE;
619 __u16 netfid;
620
621 rc = CIFSSMBOpen(xid, pTcon, full_path, FILE_OPEN, DELETE,
622 CREATE_NOT_DIR | CREATE_DELETE_ON_CLOSE,
623 &netfid, &oplock, NULL, cifs_sb->local_nls,
624 cifs_sb->mnt_cifs_flags &
625 CIFS_MOUNT_MAP_SPECIAL_CHR);
626 if (rc==0) {
627 CIFSSMBRenameOpenFile(xid, pTcon, netfid, NULL,
628 cifs_sb->local_nls,
629 cifs_sb->mnt_cifs_flags &
630 CIFS_MOUNT_MAP_SPECIAL_CHR);
631 CIFSSMBClose(xid, pTcon, netfid);
632 if (direntry->d_inode)
633 drop_nlink(direntry->d_inode);
634 }
635 } else if (rc == -EACCES) {
636 /* try only if r/o attribute set in local lookup data? */
637 pinfo_buf = kzalloc(sizeof(FILE_BASIC_INFO), GFP_KERNEL);
638 if (pinfo_buf) {
639 /* ATTRS set to normal clears r/o bit */
640 pinfo_buf->Attributes = cpu_to_le32(ATTR_NORMAL);
641 if (!(pTcon->ses->flags & CIFS_SES_NT4))
642 rc = CIFSSMBSetTimes(xid, pTcon, full_path,
643 pinfo_buf,
644 cifs_sb->local_nls,
645 cifs_sb->mnt_cifs_flags &
646 CIFS_MOUNT_MAP_SPECIAL_CHR);
647 else
648 rc = -EOPNOTSUPP;
649
650 if (rc == -EOPNOTSUPP) {
651 int oplock = FALSE;
652 __u16 netfid;
653 /* rc = CIFSSMBSetAttrLegacy(xid, pTcon,
654 full_path,
655 (__u16)ATTR_NORMAL,
656 cifs_sb->local_nls);
657 For some strange reason it seems that NT4 eats the
658 old setattr call without actually setting the
659 attributes so on to the third attempted workaround
660 */
661
662 /* BB could scan to see if we already have it open
663 and pass in pid of opener to function */
664 rc = CIFSSMBOpen(xid, pTcon, full_path,
665 FILE_OPEN, SYNCHRONIZE |
666 FILE_WRITE_ATTRIBUTES, 0,
667 &netfid, &oplock, NULL,
668 cifs_sb->local_nls,
669 cifs_sb->mnt_cifs_flags &
670 CIFS_MOUNT_MAP_SPECIAL_CHR);
671 if (rc==0) {
672 rc = CIFSSMBSetFileTimes(xid, pTcon,
673 pinfo_buf,
674 netfid);
675 CIFSSMBClose(xid, pTcon, netfid);
676 }
677 }
678 kfree(pinfo_buf);
679 }
680 if (rc==0) {
681 rc = CIFSSMBDelFile(xid, pTcon, full_path,
682 cifs_sb->local_nls,
683 cifs_sb->mnt_cifs_flags &
684 CIFS_MOUNT_MAP_SPECIAL_CHR);
685 if (!rc) {
686 if (direntry->d_inode)
687 drop_nlink(direntry->d_inode);
688 } else if (rc == -ETXTBSY) {
689 int oplock = FALSE;
690 __u16 netfid;
691
692 rc = CIFSSMBOpen(xid, pTcon, full_path,
693 FILE_OPEN, DELETE,
694 CREATE_NOT_DIR |
695 CREATE_DELETE_ON_CLOSE,
696 &netfid, &oplock, NULL,
697 cifs_sb->local_nls,
698 cifs_sb->mnt_cifs_flags &
699 CIFS_MOUNT_MAP_SPECIAL_CHR);
700 if (rc==0) {
701 CIFSSMBRenameOpenFile(xid, pTcon,
702 netfid, NULL,
703 cifs_sb->local_nls,
704 cifs_sb->mnt_cifs_flags &
705 CIFS_MOUNT_MAP_SPECIAL_CHR);
706 CIFSSMBClose(xid, pTcon, netfid);
707 if (direntry->d_inode)
708 drop_nlink(direntry->d_inode);
709 }
710 /* BB if rc = -ETXTBUSY goto the rename logic BB */
711 }
712 }
713 }
714 if (direntry->d_inode) {
715 cifsInode = CIFS_I(direntry->d_inode);
716 cifsInode->time = 0; /* will force revalidate to get info
717 when needed */
718 direntry->d_inode->i_ctime = current_fs_time(inode->i_sb);
719 }
720 if(inode) {
721 inode->i_ctime = inode->i_mtime = current_fs_time(inode->i_sb);
722 cifsInode = CIFS_I(inode);
723 cifsInode->time = 0; /* force revalidate of dir as well */
724 }
725
726 kfree(full_path);
727 FreeXid(xid);
728 return rc;
729 }
730
731 int cifs_mkdir(struct inode *inode, struct dentry *direntry, int mode)
732 {
733 int rc = 0;
734 int xid;
735 struct cifs_sb_info *cifs_sb;
736 struct cifsTconInfo *pTcon;
737 char *full_path = NULL;
738 struct inode *newinode = NULL;
739
740 cFYI(1, ("In cifs_mkdir, mode = 0x%x inode = 0x%p", mode, inode));
741
742 xid = GetXid();
743
744 cifs_sb = CIFS_SB(inode->i_sb);
745 pTcon = cifs_sb->tcon;
746
747 full_path = build_path_from_dentry(direntry);
748 if (full_path == NULL) {
749 FreeXid(xid);
750 return -ENOMEM;
751 }
752 /* BB add setting the equivalent of mode via CreateX w/ACLs */
753 rc = CIFSSMBMkDir(xid, pTcon, full_path, cifs_sb->local_nls,
754 cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR);
755 if (rc) {
756 cFYI(1, ("cifs_mkdir returned 0x%x", rc));
757 d_drop(direntry);
758 } else {
759 inc_nlink(inode);
760 if (pTcon->ses->capabilities & CAP_UNIX)
761 rc = cifs_get_inode_info_unix(&newinode, full_path,
762 inode->i_sb,xid);
763 else
764 rc = cifs_get_inode_info(&newinode, full_path, NULL,
765 inode->i_sb,xid);
766
767 if (pTcon->nocase)
768 direntry->d_op = &cifs_ci_dentry_ops;
769 else
770 direntry->d_op = &cifs_dentry_ops;
771 d_instantiate(direntry, newinode);
772 if (direntry->d_inode)
773 direntry->d_inode->i_nlink = 2;
774 if (cifs_sb->tcon->ses->capabilities & CAP_UNIX)
775 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SET_UID) {
776 CIFSSMBUnixSetPerms(xid, pTcon, full_path,
777 mode,
778 (__u64)current->fsuid,
779 (__u64)current->fsgid,
780 0 /* dev_t */,
781 cifs_sb->local_nls,
782 cifs_sb->mnt_cifs_flags &
783 CIFS_MOUNT_MAP_SPECIAL_CHR);
784 } else {
785 CIFSSMBUnixSetPerms(xid, pTcon, full_path,
786 mode, (__u64)-1,
787 (__u64)-1, 0 /* dev_t */,
788 cifs_sb->local_nls,
789 cifs_sb->mnt_cifs_flags &
790 CIFS_MOUNT_MAP_SPECIAL_CHR);
791 }
792 else {
793 /* BB to be implemented via Windows secrty descriptors
794 eg CIFSSMBWinSetPerms(xid, pTcon, full_path, mode,
795 -1, -1, local_nls); */
796 if(direntry->d_inode) {
797 direntry->d_inode->i_mode = mode;
798 direntry->d_inode->i_mode |= S_IFDIR;
799 if(cifs_sb->mnt_cifs_flags &
800 CIFS_MOUNT_SET_UID) {
801 direntry->d_inode->i_uid =
802 current->fsuid;
803 direntry->d_inode->i_gid =
804 current->fsgid;
805 }
806 }
807 }
808 }
809 kfree(full_path);
810 FreeXid(xid);
811 return rc;
812 }
813
814 int cifs_rmdir(struct inode *inode, struct dentry *direntry)
815 {
816 int rc = 0;
817 int xid;
818 struct cifs_sb_info *cifs_sb;
819 struct cifsTconInfo *pTcon;
820 char *full_path = NULL;
821 struct cifsInodeInfo *cifsInode;
822
823 cFYI(1, ("cifs_rmdir, inode = 0x%p", inode));
824
825 xid = GetXid();
826
827 cifs_sb = CIFS_SB(inode->i_sb);
828 pTcon = cifs_sb->tcon;
829
830 full_path = build_path_from_dentry(direntry);
831 if (full_path == NULL) {
832 FreeXid(xid);
833 return -ENOMEM;
834 }
835
836 rc = CIFSSMBRmDir(xid, pTcon, full_path, cifs_sb->local_nls,
837 cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR);
838
839 if (!rc) {
840 drop_nlink(inode);
841 spin_lock(&direntry->d_inode->i_lock);
842 i_size_write(direntry->d_inode,0);
843 clear_nlink(direntry->d_inode);
844 spin_unlock(&direntry->d_inode->i_lock);
845 }
846
847 cifsInode = CIFS_I(direntry->d_inode);
848 cifsInode->time = 0; /* force revalidate to go get info when
849 needed */
850 direntry->d_inode->i_ctime = inode->i_ctime = inode->i_mtime =
851 current_fs_time(inode->i_sb);
852
853 kfree(full_path);
854 FreeXid(xid);
855 return rc;
856 }
857
858 int cifs_rename(struct inode *source_inode, struct dentry *source_direntry,
859 struct inode *target_inode, struct dentry *target_direntry)
860 {
861 char *fromName;
862 char *toName;
863 struct cifs_sb_info *cifs_sb_source;
864 struct cifs_sb_info *cifs_sb_target;
865 struct cifsTconInfo *pTcon;
866 int xid;
867 int rc = 0;
868
869 xid = GetXid();
870
871 cifs_sb_target = CIFS_SB(target_inode->i_sb);
872 cifs_sb_source = CIFS_SB(source_inode->i_sb);
873 pTcon = cifs_sb_source->tcon;
874
875 if (pTcon != cifs_sb_target->tcon) {
876 FreeXid(xid);
877 return -EXDEV; /* BB actually could be allowed if same server,
878 but different share.
879 Might eventually add support for this */
880 }
881
882 /* we already have the rename sem so we do not need to grab it again
883 here to protect the path integrity */
884 fromName = build_path_from_dentry(source_direntry);
885 toName = build_path_from_dentry(target_direntry);
886 if ((fromName == NULL) || (toName == NULL)) {
887 rc = -ENOMEM;
888 goto cifs_rename_exit;
889 }
890
891 rc = CIFSSMBRename(xid, pTcon, fromName, toName,
892 cifs_sb_source->local_nls,
893 cifs_sb_source->mnt_cifs_flags &
894 CIFS_MOUNT_MAP_SPECIAL_CHR);
895 if (rc == -EEXIST) {
896 /* check if they are the same file because rename of hardlinked
897 files is a noop */
898 FILE_UNIX_BASIC_INFO *info_buf_source;
899 FILE_UNIX_BASIC_INFO *info_buf_target;
900
901 info_buf_source =
902 kmalloc(2 * sizeof(FILE_UNIX_BASIC_INFO), GFP_KERNEL);
903 if (info_buf_source != NULL) {
904 info_buf_target = info_buf_source + 1;
905 if (pTcon->ses->capabilities & CAP_UNIX)
906 rc = CIFSSMBUnixQPathInfo(xid, pTcon, fromName,
907 info_buf_source,
908 cifs_sb_source->local_nls,
909 cifs_sb_source->mnt_cifs_flags &
910 CIFS_MOUNT_MAP_SPECIAL_CHR);
911 /* else rc is still EEXIST so will fall through to
912 unlink the target and retry rename */
913 if (rc == 0) {
914 rc = CIFSSMBUnixQPathInfo(xid, pTcon, toName,
915 info_buf_target,
916 cifs_sb_target->local_nls,
917 /* remap based on source sb */
918 cifs_sb_source->mnt_cifs_flags &
919 CIFS_MOUNT_MAP_SPECIAL_CHR);
920 }
921 if ((rc == 0) &&
922 (info_buf_source->UniqueId ==
923 info_buf_target->UniqueId)) {
924 /* do not rename since the files are hardlinked which
925 is a noop */
926 } else {
927 /* we either can not tell the files are hardlinked
928 (as with Windows servers) or files are not
929 hardlinked so delete the target manually before
930 renaming to follow POSIX rather than Windows
931 semantics */
932 cifs_unlink(target_inode, target_direntry);
933 rc = CIFSSMBRename(xid, pTcon, fromName,
934 toName,
935 cifs_sb_source->local_nls,
936 cifs_sb_source->mnt_cifs_flags
937 & CIFS_MOUNT_MAP_SPECIAL_CHR);
938 }
939 kfree(info_buf_source);
940 } /* if we can not get memory just leave rc as EEXIST */
941 }
942
943 if (rc) {
944 cFYI(1, ("rename rc %d", rc));
945 }
946
947 if ((rc == -EIO) || (rc == -EEXIST)) {
948 int oplock = FALSE;
949 __u16 netfid;
950
951 /* BB FIXME Is Generic Read correct for rename? */
952 /* if renaming directory - we should not say CREATE_NOT_DIR,
953 need to test renaming open directory, also GENERIC_READ
954 might not right be right access to request */
955 rc = CIFSSMBOpen(xid, pTcon, fromName, FILE_OPEN, GENERIC_READ,
956 CREATE_NOT_DIR, &netfid, &oplock, NULL,
957 cifs_sb_source->local_nls,
958 cifs_sb_source->mnt_cifs_flags &
959 CIFS_MOUNT_MAP_SPECIAL_CHR);
960 if (rc==0) {
961 rc = CIFSSMBRenameOpenFile(xid, pTcon, netfid, toName,
962 cifs_sb_source->local_nls,
963 cifs_sb_source->mnt_cifs_flags &
964 CIFS_MOUNT_MAP_SPECIAL_CHR);
965 CIFSSMBClose(xid, pTcon, netfid);
966 }
967 }
968
969 cifs_rename_exit:
970 kfree(fromName);
971 kfree(toName);
972 FreeXid(xid);
973 return rc;
974 }
975
976 int cifs_revalidate(struct dentry *direntry)
977 {
978 int xid;
979 int rc = 0;
980 char *full_path;
981 struct cifs_sb_info *cifs_sb;
982 struct cifsInodeInfo *cifsInode;
983 loff_t local_size;
984 struct timespec local_mtime;
985 int invalidate_inode = FALSE;
986
987 if (direntry->d_inode == NULL)
988 return -ENOENT;
989
990 cifsInode = CIFS_I(direntry->d_inode);
991
992 if (cifsInode == NULL)
993 return -ENOENT;
994
995 /* no sense revalidating inode info on file that no one can write */
996 if (CIFS_I(direntry->d_inode)->clientCanCacheRead)
997 return rc;
998
999 xid = GetXid();
1000
1001 cifs_sb = CIFS_SB(direntry->d_sb);
1002
1003 /* can not safely grab the rename sem here if rename calls revalidate
1004 since that would deadlock */
1005 full_path = build_path_from_dentry(direntry);
1006 if (full_path == NULL) {
1007 FreeXid(xid);
1008 return -ENOMEM;
1009 }
1010 cFYI(1, ("Revalidate: %s inode 0x%p count %d dentry: 0x%p d_time %ld "
1011 "jiffies %ld", full_path, direntry->d_inode,
1012 direntry->d_inode->i_count.counter, direntry,
1013 direntry->d_time, jiffies));
1014
1015 if (cifsInode->time == 0) {
1016 /* was set to zero previously to force revalidate */
1017 } else if (time_before(jiffies, cifsInode->time + HZ) &&
1018 lookupCacheEnabled) {
1019 if ((S_ISREG(direntry->d_inode->i_mode) == 0) ||
1020 (direntry->d_inode->i_nlink == 1)) {
1021 kfree(full_path);
1022 FreeXid(xid);
1023 return rc;
1024 } else {
1025 cFYI(1, ("Have to revalidate file due to hardlinks"));
1026 }
1027 }
1028
1029 /* save mtime and size */
1030 local_mtime = direntry->d_inode->i_mtime;
1031 local_size = direntry->d_inode->i_size;
1032
1033 if (cifs_sb->tcon->ses->capabilities & CAP_UNIX) {
1034 rc = cifs_get_inode_info_unix(&direntry->d_inode, full_path,
1035 direntry->d_sb,xid);
1036 if (rc) {
1037 cFYI(1, ("error on getting revalidate info %d", rc));
1038 /* if (rc != -ENOENT)
1039 rc = 0; */ /* BB should we cache info on
1040 certain errors? */
1041 }
1042 } else {
1043 rc = cifs_get_inode_info(&direntry->d_inode, full_path, NULL,
1044 direntry->d_sb,xid);
1045 if (rc) {
1046 cFYI(1, ("error on getting revalidate info %d", rc));
1047 /* if (rc != -ENOENT)
1048 rc = 0; */ /* BB should we cache info on
1049 certain errors? */
1050 }
1051 }
1052 /* should we remap certain errors, access denied?, to zero */
1053
1054 /* if not oplocked, we invalidate inode pages if mtime or file size
1055 had changed on server */
1056
1057 if (timespec_equal(&local_mtime,&direntry->d_inode->i_mtime) &&
1058 (local_size == direntry->d_inode->i_size)) {
1059 cFYI(1, ("cifs_revalidate - inode unchanged"));
1060 } else {
1061 /* file may have changed on server */
1062 if (cifsInode->clientCanCacheRead) {
1063 /* no need to invalidate inode pages since we were the
1064 only ones who could have modified the file and the
1065 server copy is staler than ours */
1066 } else {
1067 invalidate_inode = TRUE;
1068 }
1069 }
1070
1071 /* can not grab this sem since kernel filesys locking documentation
1072 indicates i_mutex may be taken by the kernel on lookup and rename
1073 which could deadlock if we grab the i_mutex here as well */
1074 /* mutex_lock(&direntry->d_inode->i_mutex);*/
1075 /* need to write out dirty pages here */
1076 if (direntry->d_inode->i_mapping) {
1077 /* do we need to lock inode until after invalidate completes
1078 below? */
1079 filemap_fdatawrite(direntry->d_inode->i_mapping);
1080 }
1081 if (invalidate_inode) {
1082 /* shrink_dcache not necessary now that cifs dentry ops
1083 are exported for negative dentries */
1084 /* if(S_ISDIR(direntry->d_inode->i_mode))
1085 shrink_dcache_parent(direntry); */
1086 if (S_ISREG(direntry->d_inode->i_mode)) {
1087 if (direntry->d_inode->i_mapping)
1088 filemap_fdatawait(direntry->d_inode->i_mapping);
1089 /* may eventually have to do this for open files too */
1090 if (list_empty(&(cifsInode->openFileList))) {
1091 /* changed on server - flush read ahead pages */
1092 cFYI(1, ("Invalidating read ahead data on "
1093 "closed file"));
1094 invalidate_remote_inode(direntry->d_inode);
1095 }
1096 }
1097 }
1098 /* mutex_unlock(&direntry->d_inode->i_mutex); */
1099
1100 kfree(full_path);
1101 FreeXid(xid);
1102 return rc;
1103 }
1104
1105 int cifs_getattr(struct vfsmount *mnt, struct dentry *dentry,
1106 struct kstat *stat)
1107 {
1108 int err = cifs_revalidate(dentry);
1109 if (!err) {
1110 generic_fillattr(dentry->d_inode, stat);
1111 stat->blksize = CIFS_MAX_MSGSIZE;
1112 }
1113 return err;
1114 }
1115
1116 static int cifs_truncate_page(struct address_space *mapping, loff_t from)
1117 {
1118 pgoff_t index = from >> PAGE_CACHE_SHIFT;
1119 unsigned offset = from & (PAGE_CACHE_SIZE - 1);
1120 struct page *page;
1121 char *kaddr;
1122 int rc = 0;
1123
1124 page = grab_cache_page(mapping, index);
1125 if (!page)
1126 return -ENOMEM;
1127
1128 kaddr = kmap_atomic(page, KM_USER0);
1129 memset(kaddr + offset, 0, PAGE_CACHE_SIZE - offset);
1130 flush_dcache_page(page);
1131 kunmap_atomic(kaddr, KM_USER0);
1132 unlock_page(page);
1133 page_cache_release(page);
1134 return rc;
1135 }
1136
1137 static int cifs_vmtruncate(struct inode * inode, loff_t offset)
1138 {
1139 struct address_space *mapping = inode->i_mapping;
1140 unsigned long limit;
1141
1142 spin_lock(&inode->i_lock);
1143 if (inode->i_size < offset)
1144 goto do_expand;
1145 /*
1146 * truncation of in-use swapfiles is disallowed - it would cause
1147 * subsequent swapout to scribble on the now-freed blocks.
1148 */
1149 if (IS_SWAPFILE(inode)) {
1150 spin_unlock(&inode->i_lock);
1151 goto out_busy;
1152 }
1153 i_size_write(inode, offset);
1154 spin_unlock(&inode->i_lock);
1155 unmap_mapping_range(mapping, offset + PAGE_SIZE - 1, 0, 1);
1156 truncate_inode_pages(mapping, offset);
1157 goto out_truncate;
1158
1159 do_expand:
1160 limit = current->signal->rlim[RLIMIT_FSIZE].rlim_cur;
1161 if (limit != RLIM_INFINITY && offset > limit) {
1162 spin_unlock(&inode->i_lock);
1163 goto out_sig;
1164 }
1165 if (offset > inode->i_sb->s_maxbytes) {
1166 spin_unlock(&inode->i_lock);
1167 goto out_big;
1168 }
1169 i_size_write(inode, offset);
1170 spin_unlock(&inode->i_lock);
1171 out_truncate:
1172 if (inode->i_op && inode->i_op->truncate)
1173 inode->i_op->truncate(inode);
1174 return 0;
1175 out_sig:
1176 send_sig(SIGXFSZ, current, 0);
1177 out_big:
1178 return -EFBIG;
1179 out_busy:
1180 return -ETXTBSY;
1181 }
1182
1183 int cifs_setattr(struct dentry *direntry, struct iattr *attrs)
1184 {
1185 int xid;
1186 struct cifs_sb_info *cifs_sb;
1187 struct cifsTconInfo *pTcon;
1188 char *full_path = NULL;
1189 int rc = -EACCES;
1190 struct cifsFileInfo *open_file = NULL;
1191 FILE_BASIC_INFO time_buf;
1192 int set_time = FALSE;
1193 __u64 mode = 0xFFFFFFFFFFFFFFFFULL;
1194 __u64 uid = 0xFFFFFFFFFFFFFFFFULL;
1195 __u64 gid = 0xFFFFFFFFFFFFFFFFULL;
1196 struct cifsInodeInfo *cifsInode;
1197
1198 xid = GetXid();
1199
1200 cFYI(1, ("setattr on file %s attrs->iavalid 0x%x",
1201 direntry->d_name.name, attrs->ia_valid));
1202
1203 cifs_sb = CIFS_SB(direntry->d_inode->i_sb);
1204 pTcon = cifs_sb->tcon;
1205
1206 if ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_PERM) == 0) {
1207 /* check if we have permission to change attrs */
1208 rc = inode_change_ok(direntry->d_inode, attrs);
1209 if(rc < 0) {
1210 FreeXid(xid);
1211 return rc;
1212 } else
1213 rc = 0;
1214 }
1215
1216 full_path = build_path_from_dentry(direntry);
1217 if (full_path == NULL) {
1218 FreeXid(xid);
1219 return -ENOMEM;
1220 }
1221 cifsInode = CIFS_I(direntry->d_inode);
1222
1223 /* BB check if we need to refresh inode from server now ? BB */
1224
1225 /* need to flush data before changing file size on server */
1226 filemap_write_and_wait(direntry->d_inode->i_mapping);
1227
1228 if (attrs->ia_valid & ATTR_SIZE) {
1229 /* To avoid spurious oplock breaks from server, in the case of
1230 inodes that we already have open, avoid doing path based
1231 setting of file size if we can do it by handle.
1232 This keeps our caching token (oplock) and avoids timeouts
1233 when the local oplock break takes longer to flush
1234 writebehind data than the SMB timeout for the SetPathInfo
1235 request would allow */
1236
1237 open_file = find_writable_file(cifsInode);
1238 if (open_file) {
1239 __u16 nfid = open_file->netfid;
1240 __u32 npid = open_file->pid;
1241 rc = CIFSSMBSetFileSize(xid, pTcon, attrs->ia_size,
1242 nfid, npid, FALSE);
1243 atomic_dec(&open_file->wrtPending);
1244 cFYI(1,("SetFSize for attrs rc = %d", rc));
1245 if((rc == -EINVAL) || (rc == -EOPNOTSUPP)) {
1246 int bytes_written;
1247 rc = CIFSSMBWrite(xid, pTcon,
1248 nfid, 0, attrs->ia_size,
1249 &bytes_written, NULL, NULL,
1250 1 /* 45 seconds */);
1251 cFYI(1,("Wrt seteof rc %d", rc));
1252 }
1253 } else
1254 rc = -EINVAL;
1255
1256 if (rc != 0) {
1257 /* Set file size by pathname rather than by handle
1258 either because no valid, writeable file handle for
1259 it was found or because there was an error setting
1260 it by handle */
1261 rc = CIFSSMBSetEOF(xid, pTcon, full_path,
1262 attrs->ia_size, FALSE,
1263 cifs_sb->local_nls,
1264 cifs_sb->mnt_cifs_flags &
1265 CIFS_MOUNT_MAP_SPECIAL_CHR);
1266 cFYI(1, ("SetEOF by path (setattrs) rc = %d", rc));
1267 if((rc == -EINVAL) || (rc == -EOPNOTSUPP)) {
1268 __u16 netfid;
1269 int oplock = FALSE;
1270
1271 rc = SMBLegacyOpen(xid, pTcon, full_path,
1272 FILE_OPEN,
1273 SYNCHRONIZE | FILE_WRITE_ATTRIBUTES,
1274 CREATE_NOT_DIR, &netfid, &oplock,
1275 NULL, cifs_sb->local_nls,
1276 cifs_sb->mnt_cifs_flags &
1277 CIFS_MOUNT_MAP_SPECIAL_CHR);
1278 if (rc==0) {
1279 int bytes_written;
1280 rc = CIFSSMBWrite(xid, pTcon,
1281 netfid, 0,
1282 attrs->ia_size,
1283 &bytes_written, NULL,
1284 NULL, 1 /* 45 sec */);
1285 cFYI(1,("wrt seteof rc %d",rc));
1286 CIFSSMBClose(xid, pTcon, netfid);
1287 }
1288
1289 }
1290 }
1291
1292 /* Server is ok setting allocation size implicitly - no need
1293 to call:
1294 CIFSSMBSetEOF(xid, pTcon, full_path, attrs->ia_size, TRUE,
1295 cifs_sb->local_nls);
1296 */
1297
1298 if (rc == 0) {
1299 rc = cifs_vmtruncate(direntry->d_inode, attrs->ia_size);
1300 cifs_truncate_page(direntry->d_inode->i_mapping,
1301 direntry->d_inode->i_size);
1302 } else
1303 goto cifs_setattr_exit;
1304 }
1305 if (attrs->ia_valid & ATTR_UID) {
1306 cFYI(1, ("UID changed to %d", attrs->ia_uid));
1307 uid = attrs->ia_uid;
1308 }
1309 if (attrs->ia_valid & ATTR_GID) {
1310 cFYI(1, ("GID changed to %d", attrs->ia_gid));
1311 gid = attrs->ia_gid;
1312 }
1313
1314 time_buf.Attributes = 0;
1315 if (attrs->ia_valid & ATTR_MODE) {
1316 cFYI(1, ("Mode changed to 0x%x", attrs->ia_mode));
1317 mode = attrs->ia_mode;
1318 }
1319
1320 if ((cifs_sb->tcon->ses->capabilities & CAP_UNIX)
1321 && (attrs->ia_valid & (ATTR_MODE | ATTR_GID | ATTR_UID)))
1322 rc = CIFSSMBUnixSetPerms(xid, pTcon, full_path, mode, uid, gid,
1323 0 /* dev_t */, cifs_sb->local_nls,
1324 cifs_sb->mnt_cifs_flags &
1325 CIFS_MOUNT_MAP_SPECIAL_CHR);
1326 else if (attrs->ia_valid & ATTR_MODE) {
1327 rc = 0;
1328 if ((mode & S_IWUGO) == 0) /* not writeable */ {
1329 if ((cifsInode->cifsAttrs & ATTR_READONLY) == 0)
1330 time_buf.Attributes =
1331 cpu_to_le32(cifsInode->cifsAttrs |
1332 ATTR_READONLY);
1333 } else if ((mode & S_IWUGO) == S_IWUGO) {
1334 if (cifsInode->cifsAttrs & ATTR_READONLY)
1335 time_buf.Attributes =
1336 cpu_to_le32(cifsInode->cifsAttrs &
1337 (~ATTR_READONLY));
1338 }
1339 /* BB to be implemented -
1340 via Windows security descriptors or streams */
1341 /* CIFSSMBWinSetPerms(xid, pTcon, full_path, mode, uid, gid,
1342 cifs_sb->local_nls); */
1343 }
1344
1345 if (attrs->ia_valid & ATTR_ATIME) {
1346 set_time = TRUE;
1347 time_buf.LastAccessTime =
1348 cpu_to_le64(cifs_UnixTimeToNT(attrs->ia_atime));
1349 } else
1350 time_buf.LastAccessTime = 0;
1351
1352 if (attrs->ia_valid & ATTR_MTIME) {
1353 set_time = TRUE;
1354 time_buf.LastWriteTime =
1355 cpu_to_le64(cifs_UnixTimeToNT(attrs->ia_mtime));
1356 } else
1357 time_buf.LastWriteTime = 0;
1358 /* Do not set ctime explicitly unless other time
1359 stamps are changed explicitly (i.e. by utime()
1360 since we would then have a mix of client and
1361 server times */
1362
1363 if (set_time && (attrs->ia_valid & ATTR_CTIME)) {
1364 set_time = TRUE;
1365 /* Although Samba throws this field away
1366 it may be useful to Windows - but we do
1367 not want to set ctime unless some other
1368 timestamp is changing */
1369 cFYI(1, ("CIFS - CTIME changed"));
1370 time_buf.ChangeTime =
1371 cpu_to_le64(cifs_UnixTimeToNT(attrs->ia_ctime));
1372 } else
1373 time_buf.ChangeTime = 0;
1374
1375 if (set_time || time_buf.Attributes) {
1376 time_buf.CreationTime = 0; /* do not change */
1377 /* In the future we should experiment - try setting timestamps
1378 via Handle (SetFileInfo) instead of by path */
1379 if (!(pTcon->ses->flags & CIFS_SES_NT4))
1380 rc = CIFSSMBSetTimes(xid, pTcon, full_path, &time_buf,
1381 cifs_sb->local_nls,
1382 cifs_sb->mnt_cifs_flags &
1383 CIFS_MOUNT_MAP_SPECIAL_CHR);
1384 else
1385 rc = -EOPNOTSUPP;
1386
1387 if (rc == -EOPNOTSUPP) {
1388 int oplock = FALSE;
1389 __u16 netfid;
1390
1391 cFYI(1, ("calling SetFileInfo since SetPathInfo for "
1392 "times not supported by this server"));
1393 /* BB we could scan to see if we already have it open
1394 and pass in pid of opener to function */
1395 rc = CIFSSMBOpen(xid, pTcon, full_path, FILE_OPEN,
1396 SYNCHRONIZE | FILE_WRITE_ATTRIBUTES,
1397 CREATE_NOT_DIR, &netfid, &oplock,
1398 NULL, cifs_sb->local_nls,
1399 cifs_sb->mnt_cifs_flags &
1400 CIFS_MOUNT_MAP_SPECIAL_CHR);
1401 if (rc==0) {
1402 rc = CIFSSMBSetFileTimes(xid, pTcon, &time_buf,
1403 netfid);
1404 CIFSSMBClose(xid, pTcon, netfid);
1405 } else {
1406 /* BB For even older servers we could convert time_buf
1407 into old DOS style which uses two second
1408 granularity */
1409
1410 /* rc = CIFSSMBSetTimesLegacy(xid, pTcon, full_path,
1411 &time_buf, cifs_sb->local_nls); */
1412 }
1413 }
1414 /* Even if error on time set, no sense failing the call if
1415 the server would set the time to a reasonable value anyway,
1416 and this check ensures that we are not being called from
1417 sys_utimes in which case we ought to fail the call back to
1418 the user when the server rejects the call */
1419 if((rc) && (attrs->ia_valid &
1420 (ATTR_MODE | ATTR_GID | ATTR_UID | ATTR_SIZE)))
1421 rc = 0;
1422 }
1423
1424 /* do not need local check to inode_check_ok since the server does
1425 that */
1426 if (!rc)
1427 rc = inode_setattr(direntry->d_inode, attrs);
1428 cifs_setattr_exit:
1429 kfree(full_path);
1430 FreeXid(xid);
1431 return rc;
1432 }
1433
1434 #if 0
1435 void cifs_delete_inode(struct inode *inode)
1436 {
1437 cFYI(1, ("In cifs_delete_inode, inode = 0x%p", inode));
1438 /* may have to add back in if and when safe distributed caching of
1439 directories added e.g. via FindNotify */
1440 }
1441 #endif
Linux kernel - Deliverables
This page took 0.085007 seconds and 6 git commands to generate.