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[CIFS] reset mode when client notices that ATTR_READONLY is no longer set
[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 else if ((inode->i_mode & S_IWUGO) == 0)
498 /* the ATTR_READONLY flag may have been */
499 /* changed on server -- set any w bits */
500 /* allowed by mnt_file_mode */
501 inode->i_mode |= (S_IWUGO &
502 cifs_sb->mnt_file_mode);
503 /* BB add code here -
504 validate if device or weird share or device type? */
505 }
506
507 spin_lock(&inode->i_lock);
508 if (is_size_safe_to_change(cifsInfo, le64_to_cpu(pfindData->EndOfFile))) {
509 /* can not safely shrink the file size here if the
510 client is writing to it due to potential races */
511 i_size_write(inode,le64_to_cpu(pfindData->EndOfFile));
512
513 /* 512 bytes (2**9) is the fake blocksize that must be
514 used for this calculation */
515 inode->i_blocks = (512 - 1 + le64_to_cpu(
516 pfindData->AllocationSize)) >> 9;
517 }
518 spin_unlock(&inode->i_lock);
519
520 inode->i_nlink = le32_to_cpu(pfindData->NumberOfLinks);
521
522 /* BB fill in uid and gid here? with help from winbind?
523 or retrieve from NTFS stream extended attribute */
524 if(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_UNX_EMUL) {
525 /* fill in uid, gid, mode from server ACL */
526 get_sfu_uid_mode(inode, search_path, cifs_sb, xid);
527 } else if (atomic_read(&cifsInfo->inUse) == 0) {
528 inode->i_uid = cifs_sb->mnt_uid;
529 inode->i_gid = cifs_sb->mnt_gid;
530 /* set so we do not keep refreshing these fields with
531 bad data after user has changed them in memory */
532 atomic_set(&cifsInfo->inUse,1);
533 }
534
535 if (S_ISREG(inode->i_mode)) {
536 cFYI(1, ("File inode"));
537 inode->i_op = &cifs_file_inode_ops;
538 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DIRECT_IO) {
539 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_BRL)
540 inode->i_fop =
541 &cifs_file_direct_nobrl_ops;
542 else
543 inode->i_fop = &cifs_file_direct_ops;
544 } else if(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_BRL)
545 inode->i_fop = &cifs_file_nobrl_ops;
546 else /* not direct, send byte range locks */
547 inode->i_fop = &cifs_file_ops;
548
549 if(pTcon->ses->server->maxBuf <
550 PAGE_CACHE_SIZE + MAX_CIFS_HDR_SIZE)
551 inode->i_data.a_ops = &cifs_addr_ops_smallbuf;
552 else
553 inode->i_data.a_ops = &cifs_addr_ops;
554 } else if (S_ISDIR(inode->i_mode)) {
555 cFYI(1, ("Directory inode"));
556 inode->i_op = &cifs_dir_inode_ops;
557 inode->i_fop = &cifs_dir_ops;
558 } else if (S_ISLNK(inode->i_mode)) {
559 cFYI(1, ("Symbolic Link inode"));
560 inode->i_op = &cifs_symlink_inode_ops;
561 } else {
562 init_special_inode(inode, inode->i_mode,
563 inode->i_rdev);
564 }
565 }
566 kfree(buf);
567 return rc;
568 }
569
570 /* gets root inode */
571 void cifs_read_inode(struct inode *inode)
572 {
573 int xid;
574 struct cifs_sb_info *cifs_sb;
575
576 cifs_sb = CIFS_SB(inode->i_sb);
577 xid = GetXid();
578 if (cifs_sb->tcon->ses->capabilities & CAP_UNIX)
579 cifs_get_inode_info_unix(&inode, "", inode->i_sb,xid);
580 else
581 cifs_get_inode_info(&inode, "", NULL, inode->i_sb,xid);
582 /* can not call macro FreeXid here since in a void func */
583 _FreeXid(xid);
584 }
585
586 int cifs_unlink(struct inode *inode, struct dentry *direntry)
587 {
588 int rc = 0;
589 int xid;
590 struct cifs_sb_info *cifs_sb;
591 struct cifsTconInfo *pTcon;
592 char *full_path = NULL;
593 struct cifsInodeInfo *cifsInode;
594 FILE_BASIC_INFO *pinfo_buf;
595
596 cFYI(1, ("cifs_unlink, inode = 0x%p", inode));
597
598 xid = GetXid();
599
600 if(inode)
601 cifs_sb = CIFS_SB(inode->i_sb);
602 else
603 cifs_sb = CIFS_SB(direntry->d_sb);
604 pTcon = cifs_sb->tcon;
605
606 /* Unlink can be called from rename so we can not grab the sem here
607 since we deadlock otherwise */
608 /* mutex_lock(&direntry->d_sb->s_vfs_rename_mutex);*/
609 full_path = build_path_from_dentry(direntry);
610 /* mutex_unlock(&direntry->d_sb->s_vfs_rename_mutex);*/
611 if (full_path == NULL) {
612 FreeXid(xid);
613 return -ENOMEM;
614 }
615 rc = CIFSSMBDelFile(xid, pTcon, full_path, cifs_sb->local_nls,
616 cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR);
617
618 if (!rc) {
619 if (direntry->d_inode)
620 drop_nlink(direntry->d_inode);
621 } else if (rc == -ENOENT) {
622 d_drop(direntry);
623 } else if (rc == -ETXTBSY) {
624 int oplock = FALSE;
625 __u16 netfid;
626
627 rc = CIFSSMBOpen(xid, pTcon, full_path, FILE_OPEN, DELETE,
628 CREATE_NOT_DIR | CREATE_DELETE_ON_CLOSE,
629 &netfid, &oplock, NULL, cifs_sb->local_nls,
630 cifs_sb->mnt_cifs_flags &
631 CIFS_MOUNT_MAP_SPECIAL_CHR);
632 if (rc==0) {
633 CIFSSMBRenameOpenFile(xid, pTcon, netfid, NULL,
634 cifs_sb->local_nls,
635 cifs_sb->mnt_cifs_flags &
636 CIFS_MOUNT_MAP_SPECIAL_CHR);
637 CIFSSMBClose(xid, pTcon, netfid);
638 if (direntry->d_inode)
639 drop_nlink(direntry->d_inode);
640 }
641 } else if (rc == -EACCES) {
642 /* try only if r/o attribute set in local lookup data? */
643 pinfo_buf = kzalloc(sizeof(FILE_BASIC_INFO), GFP_KERNEL);
644 if (pinfo_buf) {
645 /* ATTRS set to normal clears r/o bit */
646 pinfo_buf->Attributes = cpu_to_le32(ATTR_NORMAL);
647 if (!(pTcon->ses->flags & CIFS_SES_NT4))
648 rc = CIFSSMBSetTimes(xid, pTcon, full_path,
649 pinfo_buf,
650 cifs_sb->local_nls,
651 cifs_sb->mnt_cifs_flags &
652 CIFS_MOUNT_MAP_SPECIAL_CHR);
653 else
654 rc = -EOPNOTSUPP;
655
656 if (rc == -EOPNOTSUPP) {
657 int oplock = FALSE;
658 __u16 netfid;
659 /* rc = CIFSSMBSetAttrLegacy(xid, pTcon,
660 full_path,
661 (__u16)ATTR_NORMAL,
662 cifs_sb->local_nls);
663 For some strange reason it seems that NT4 eats the
664 old setattr call without actually setting the
665 attributes so on to the third attempted workaround
666 */
667
668 /* BB could scan to see if we already have it open
669 and pass in pid of opener to function */
670 rc = CIFSSMBOpen(xid, pTcon, full_path,
671 FILE_OPEN, SYNCHRONIZE |
672 FILE_WRITE_ATTRIBUTES, 0,
673 &netfid, &oplock, NULL,
674 cifs_sb->local_nls,
675 cifs_sb->mnt_cifs_flags &
676 CIFS_MOUNT_MAP_SPECIAL_CHR);
677 if (rc==0) {
678 rc = CIFSSMBSetFileTimes(xid, pTcon,
679 pinfo_buf,
680 netfid);
681 CIFSSMBClose(xid, pTcon, netfid);
682 }
683 }
684 kfree(pinfo_buf);
685 }
686 if (rc==0) {
687 rc = CIFSSMBDelFile(xid, pTcon, full_path,
688 cifs_sb->local_nls,
689 cifs_sb->mnt_cifs_flags &
690 CIFS_MOUNT_MAP_SPECIAL_CHR);
691 if (!rc) {
692 if (direntry->d_inode)
693 drop_nlink(direntry->d_inode);
694 } else if (rc == -ETXTBSY) {
695 int oplock = FALSE;
696 __u16 netfid;
697
698 rc = CIFSSMBOpen(xid, pTcon, full_path,
699 FILE_OPEN, DELETE,
700 CREATE_NOT_DIR |
701 CREATE_DELETE_ON_CLOSE,
702 &netfid, &oplock, NULL,
703 cifs_sb->local_nls,
704 cifs_sb->mnt_cifs_flags &
705 CIFS_MOUNT_MAP_SPECIAL_CHR);
706 if (rc==0) {
707 CIFSSMBRenameOpenFile(xid, pTcon,
708 netfid, NULL,
709 cifs_sb->local_nls,
710 cifs_sb->mnt_cifs_flags &
711 CIFS_MOUNT_MAP_SPECIAL_CHR);
712 CIFSSMBClose(xid, pTcon, netfid);
713 if (direntry->d_inode)
714 drop_nlink(direntry->d_inode);
715 }
716 /* BB if rc = -ETXTBUSY goto the rename logic BB */
717 }
718 }
719 }
720 if (direntry->d_inode) {
721 cifsInode = CIFS_I(direntry->d_inode);
722 cifsInode->time = 0; /* will force revalidate to get info
723 when needed */
724 direntry->d_inode->i_ctime = current_fs_time(inode->i_sb);
725 }
726 if(inode) {
727 inode->i_ctime = inode->i_mtime = current_fs_time(inode->i_sb);
728 cifsInode = CIFS_I(inode);
729 cifsInode->time = 0; /* force revalidate of dir as well */
730 }
731
732 kfree(full_path);
733 FreeXid(xid);
734 return rc;
735 }
736
737 int cifs_mkdir(struct inode *inode, struct dentry *direntry, int mode)
738 {
739 int rc = 0;
740 int xid;
741 struct cifs_sb_info *cifs_sb;
742 struct cifsTconInfo *pTcon;
743 char *full_path = NULL;
744 struct inode *newinode = NULL;
745
746 cFYI(1, ("In cifs_mkdir, mode = 0x%x inode = 0x%p", mode, inode));
747
748 xid = GetXid();
749
750 cifs_sb = CIFS_SB(inode->i_sb);
751 pTcon = cifs_sb->tcon;
752
753 full_path = build_path_from_dentry(direntry);
754 if (full_path == NULL) {
755 FreeXid(xid);
756 return -ENOMEM;
757 }
758 /* BB add setting the equivalent of mode via CreateX w/ACLs */
759 rc = CIFSSMBMkDir(xid, pTcon, full_path, cifs_sb->local_nls,
760 cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR);
761 if (rc) {
762 cFYI(1, ("cifs_mkdir returned 0x%x", rc));
763 d_drop(direntry);
764 } else {
765 inc_nlink(inode);
766 if (pTcon->ses->capabilities & CAP_UNIX)
767 rc = cifs_get_inode_info_unix(&newinode, full_path,
768 inode->i_sb,xid);
769 else
770 rc = cifs_get_inode_info(&newinode, full_path, NULL,
771 inode->i_sb,xid);
772
773 if (pTcon->nocase)
774 direntry->d_op = &cifs_ci_dentry_ops;
775 else
776 direntry->d_op = &cifs_dentry_ops;
777 d_instantiate(direntry, newinode);
778 if (direntry->d_inode)
779 direntry->d_inode->i_nlink = 2;
780 if (cifs_sb->tcon->ses->capabilities & CAP_UNIX)
781 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SET_UID) {
782 CIFSSMBUnixSetPerms(xid, pTcon, full_path,
783 mode,
784 (__u64)current->fsuid,
785 (__u64)current->fsgid,
786 0 /* dev_t */,
787 cifs_sb->local_nls,
788 cifs_sb->mnt_cifs_flags &
789 CIFS_MOUNT_MAP_SPECIAL_CHR);
790 } else {
791 CIFSSMBUnixSetPerms(xid, pTcon, full_path,
792 mode, (__u64)-1,
793 (__u64)-1, 0 /* dev_t */,
794 cifs_sb->local_nls,
795 cifs_sb->mnt_cifs_flags &
796 CIFS_MOUNT_MAP_SPECIAL_CHR);
797 }
798 else {
799 /* BB to be implemented via Windows secrty descriptors
800 eg CIFSSMBWinSetPerms(xid, pTcon, full_path, mode,
801 -1, -1, local_nls); */
802 if(direntry->d_inode) {
803 direntry->d_inode->i_mode = mode;
804 direntry->d_inode->i_mode |= S_IFDIR;
805 if(cifs_sb->mnt_cifs_flags &
806 CIFS_MOUNT_SET_UID) {
807 direntry->d_inode->i_uid =
808 current->fsuid;
809 direntry->d_inode->i_gid =
810 current->fsgid;
811 }
812 }
813 }
814 }
815 kfree(full_path);
816 FreeXid(xid);
817 return rc;
818 }
819
820 int cifs_rmdir(struct inode *inode, struct dentry *direntry)
821 {
822 int rc = 0;
823 int xid;
824 struct cifs_sb_info *cifs_sb;
825 struct cifsTconInfo *pTcon;
826 char *full_path = NULL;
827 struct cifsInodeInfo *cifsInode;
828
829 cFYI(1, ("cifs_rmdir, inode = 0x%p", inode));
830
831 xid = GetXid();
832
833 cifs_sb = CIFS_SB(inode->i_sb);
834 pTcon = cifs_sb->tcon;
835
836 full_path = build_path_from_dentry(direntry);
837 if (full_path == NULL) {
838 FreeXid(xid);
839 return -ENOMEM;
840 }
841
842 rc = CIFSSMBRmDir(xid, pTcon, full_path, cifs_sb->local_nls,
843 cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR);
844
845 if (!rc) {
846 drop_nlink(inode);
847 spin_lock(&direntry->d_inode->i_lock);
848 i_size_write(direntry->d_inode,0);
849 clear_nlink(direntry->d_inode);
850 spin_unlock(&direntry->d_inode->i_lock);
851 }
852
853 cifsInode = CIFS_I(direntry->d_inode);
854 cifsInode->time = 0; /* force revalidate to go get info when
855 needed */
856 direntry->d_inode->i_ctime = inode->i_ctime = inode->i_mtime =
857 current_fs_time(inode->i_sb);
858
859 kfree(full_path);
860 FreeXid(xid);
861 return rc;
862 }
863
864 int cifs_rename(struct inode *source_inode, struct dentry *source_direntry,
865 struct inode *target_inode, struct dentry *target_direntry)
866 {
867 char *fromName;
868 char *toName;
869 struct cifs_sb_info *cifs_sb_source;
870 struct cifs_sb_info *cifs_sb_target;
871 struct cifsTconInfo *pTcon;
872 int xid;
873 int rc = 0;
874
875 xid = GetXid();
876
877 cifs_sb_target = CIFS_SB(target_inode->i_sb);
878 cifs_sb_source = CIFS_SB(source_inode->i_sb);
879 pTcon = cifs_sb_source->tcon;
880
881 if (pTcon != cifs_sb_target->tcon) {
882 FreeXid(xid);
883 return -EXDEV; /* BB actually could be allowed if same server,
884 but different share.
885 Might eventually add support for this */
886 }
887
888 /* we already have the rename sem so we do not need to grab it again
889 here to protect the path integrity */
890 fromName = build_path_from_dentry(source_direntry);
891 toName = build_path_from_dentry(target_direntry);
892 if ((fromName == NULL) || (toName == NULL)) {
893 rc = -ENOMEM;
894 goto cifs_rename_exit;
895 }
896
897 rc = CIFSSMBRename(xid, pTcon, fromName, toName,
898 cifs_sb_source->local_nls,
899 cifs_sb_source->mnt_cifs_flags &
900 CIFS_MOUNT_MAP_SPECIAL_CHR);
901 if (rc == -EEXIST) {
902 /* check if they are the same file because rename of hardlinked
903 files is a noop */
904 FILE_UNIX_BASIC_INFO *info_buf_source;
905 FILE_UNIX_BASIC_INFO *info_buf_target;
906
907 info_buf_source =
908 kmalloc(2 * sizeof(FILE_UNIX_BASIC_INFO), GFP_KERNEL);
909 if (info_buf_source != NULL) {
910 info_buf_target = info_buf_source + 1;
911 if (pTcon->ses->capabilities & CAP_UNIX)
912 rc = CIFSSMBUnixQPathInfo(xid, pTcon, fromName,
913 info_buf_source,
914 cifs_sb_source->local_nls,
915 cifs_sb_source->mnt_cifs_flags &
916 CIFS_MOUNT_MAP_SPECIAL_CHR);
917 /* else rc is still EEXIST so will fall through to
918 unlink the target and retry rename */
919 if (rc == 0) {
920 rc = CIFSSMBUnixQPathInfo(xid, pTcon, toName,
921 info_buf_target,
922 cifs_sb_target->local_nls,
923 /* remap based on source sb */
924 cifs_sb_source->mnt_cifs_flags &
925 CIFS_MOUNT_MAP_SPECIAL_CHR);
926 }
927 if ((rc == 0) &&
928 (info_buf_source->UniqueId ==
929 info_buf_target->UniqueId)) {
930 /* do not rename since the files are hardlinked which
931 is a noop */
932 } else {
933 /* we either can not tell the files are hardlinked
934 (as with Windows servers) or files are not
935 hardlinked so delete the target manually before
936 renaming to follow POSIX rather than Windows
937 semantics */
938 cifs_unlink(target_inode, target_direntry);
939 rc = CIFSSMBRename(xid, pTcon, fromName,
940 toName,
941 cifs_sb_source->local_nls,
942 cifs_sb_source->mnt_cifs_flags
943 & CIFS_MOUNT_MAP_SPECIAL_CHR);
944 }
945 kfree(info_buf_source);
946 } /* if we can not get memory just leave rc as EEXIST */
947 }
948
949 if (rc) {
950 cFYI(1, ("rename rc %d", rc));
951 }
952
953 if ((rc == -EIO) || (rc == -EEXIST)) {
954 int oplock = FALSE;
955 __u16 netfid;
956
957 /* BB FIXME Is Generic Read correct for rename? */
958 /* if renaming directory - we should not say CREATE_NOT_DIR,
959 need to test renaming open directory, also GENERIC_READ
960 might not right be right access to request */
961 rc = CIFSSMBOpen(xid, pTcon, fromName, FILE_OPEN, GENERIC_READ,
962 CREATE_NOT_DIR, &netfid, &oplock, NULL,
963 cifs_sb_source->local_nls,
964 cifs_sb_source->mnt_cifs_flags &
965 CIFS_MOUNT_MAP_SPECIAL_CHR);
966 if (rc==0) {
967 rc = CIFSSMBRenameOpenFile(xid, pTcon, netfid, toName,
968 cifs_sb_source->local_nls,
969 cifs_sb_source->mnt_cifs_flags &
970 CIFS_MOUNT_MAP_SPECIAL_CHR);
971 CIFSSMBClose(xid, pTcon, netfid);
972 }
973 }
974
975 cifs_rename_exit:
976 kfree(fromName);
977 kfree(toName);
978 FreeXid(xid);
979 return rc;
980 }
981
982 int cifs_revalidate(struct dentry *direntry)
983 {
984 int xid;
985 int rc = 0;
986 char *full_path;
987 struct cifs_sb_info *cifs_sb;
988 struct cifsInodeInfo *cifsInode;
989 loff_t local_size;
990 struct timespec local_mtime;
991 int invalidate_inode = FALSE;
992
993 if (direntry->d_inode == NULL)
994 return -ENOENT;
995
996 cifsInode = CIFS_I(direntry->d_inode);
997
998 if (cifsInode == NULL)
999 return -ENOENT;
1000
1001 /* no sense revalidating inode info on file that no one can write */
1002 if (CIFS_I(direntry->d_inode)->clientCanCacheRead)
1003 return rc;
1004
1005 xid = GetXid();
1006
1007 cifs_sb = CIFS_SB(direntry->d_sb);
1008
1009 /* can not safely grab the rename sem here if rename calls revalidate
1010 since that would deadlock */
1011 full_path = build_path_from_dentry(direntry);
1012 if (full_path == NULL) {
1013 FreeXid(xid);
1014 return -ENOMEM;
1015 }
1016 cFYI(1, ("Revalidate: %s inode 0x%p count %d dentry: 0x%p d_time %ld "
1017 "jiffies %ld", full_path, direntry->d_inode,
1018 direntry->d_inode->i_count.counter, direntry,
1019 direntry->d_time, jiffies));
1020
1021 if (cifsInode->time == 0) {
1022 /* was set to zero previously to force revalidate */
1023 } else if (time_before(jiffies, cifsInode->time + HZ) &&
1024 lookupCacheEnabled) {
1025 if ((S_ISREG(direntry->d_inode->i_mode) == 0) ||
1026 (direntry->d_inode->i_nlink == 1)) {
1027 kfree(full_path);
1028 FreeXid(xid);
1029 return rc;
1030 } else {
1031 cFYI(1, ("Have to revalidate file due to hardlinks"));
1032 }
1033 }
1034
1035 /* save mtime and size */
1036 local_mtime = direntry->d_inode->i_mtime;
1037 local_size = direntry->d_inode->i_size;
1038
1039 if (cifs_sb->tcon->ses->capabilities & CAP_UNIX) {
1040 rc = cifs_get_inode_info_unix(&direntry->d_inode, full_path,
1041 direntry->d_sb,xid);
1042 if (rc) {
1043 cFYI(1, ("error on getting revalidate info %d", rc));
1044 /* if (rc != -ENOENT)
1045 rc = 0; */ /* BB should we cache info on
1046 certain errors? */
1047 }
1048 } else {
1049 rc = cifs_get_inode_info(&direntry->d_inode, full_path, NULL,
1050 direntry->d_sb,xid);
1051 if (rc) {
1052 cFYI(1, ("error on getting revalidate info %d", rc));
1053 /* if (rc != -ENOENT)
1054 rc = 0; */ /* BB should we cache info on
1055 certain errors? */
1056 }
1057 }
1058 /* should we remap certain errors, access denied?, to zero */
1059
1060 /* if not oplocked, we invalidate inode pages if mtime or file size
1061 had changed on server */
1062
1063 if (timespec_equal(&local_mtime,&direntry->d_inode->i_mtime) &&
1064 (local_size == direntry->d_inode->i_size)) {
1065 cFYI(1, ("cifs_revalidate - inode unchanged"));
1066 } else {
1067 /* file may have changed on server */
1068 if (cifsInode->clientCanCacheRead) {
1069 /* no need to invalidate inode pages since we were the
1070 only ones who could have modified the file and the
1071 server copy is staler than ours */
1072 } else {
1073 invalidate_inode = TRUE;
1074 }
1075 }
1076
1077 /* can not grab this sem since kernel filesys locking documentation
1078 indicates i_mutex may be taken by the kernel on lookup and rename
1079 which could deadlock if we grab the i_mutex here as well */
1080 /* mutex_lock(&direntry->d_inode->i_mutex);*/
1081 /* need to write out dirty pages here */
1082 if (direntry->d_inode->i_mapping) {
1083 /* do we need to lock inode until after invalidate completes
1084 below? */
1085 filemap_fdatawrite(direntry->d_inode->i_mapping);
1086 }
1087 if (invalidate_inode) {
1088 /* shrink_dcache not necessary now that cifs dentry ops
1089 are exported for negative dentries */
1090 /* if(S_ISDIR(direntry->d_inode->i_mode))
1091 shrink_dcache_parent(direntry); */
1092 if (S_ISREG(direntry->d_inode->i_mode)) {
1093 if (direntry->d_inode->i_mapping)
1094 filemap_fdatawait(direntry->d_inode->i_mapping);
1095 /* may eventually have to do this for open files too */
1096 if (list_empty(&(cifsInode->openFileList))) {
1097 /* changed on server - flush read ahead pages */
1098 cFYI(1, ("Invalidating read ahead data on "
1099 "closed file"));
1100 invalidate_remote_inode(direntry->d_inode);
1101 }
1102 }
1103 }
1104 /* mutex_unlock(&direntry->d_inode->i_mutex); */
1105
1106 kfree(full_path);
1107 FreeXid(xid);
1108 return rc;
1109 }
1110
1111 int cifs_getattr(struct vfsmount *mnt, struct dentry *dentry,
1112 struct kstat *stat)
1113 {
1114 int err = cifs_revalidate(dentry);
1115 if (!err) {
1116 generic_fillattr(dentry->d_inode, stat);
1117 stat->blksize = CIFS_MAX_MSGSIZE;
1118 }
1119 return err;
1120 }
1121
1122 static int cifs_truncate_page(struct address_space *mapping, loff_t from)
1123 {
1124 pgoff_t index = from >> PAGE_CACHE_SHIFT;
1125 unsigned offset = from & (PAGE_CACHE_SIZE - 1);
1126 struct page *page;
1127 char *kaddr;
1128 int rc = 0;
1129
1130 page = grab_cache_page(mapping, index);
1131 if (!page)
1132 return -ENOMEM;
1133
1134 kaddr = kmap_atomic(page, KM_USER0);
1135 memset(kaddr + offset, 0, PAGE_CACHE_SIZE - offset);
1136 flush_dcache_page(page);
1137 kunmap_atomic(kaddr, KM_USER0);
1138 unlock_page(page);
1139 page_cache_release(page);
1140 return rc;
1141 }
1142
1143 static int cifs_vmtruncate(struct inode * inode, loff_t offset)
1144 {
1145 struct address_space *mapping = inode->i_mapping;
1146 unsigned long limit;
1147
1148 spin_lock(&inode->i_lock);
1149 if (inode->i_size < offset)
1150 goto do_expand;
1151 /*
1152 * truncation of in-use swapfiles is disallowed - it would cause
1153 * subsequent swapout to scribble on the now-freed blocks.
1154 */
1155 if (IS_SWAPFILE(inode)) {
1156 spin_unlock(&inode->i_lock);
1157 goto out_busy;
1158 }
1159 i_size_write(inode, offset);
1160 spin_unlock(&inode->i_lock);
1161 unmap_mapping_range(mapping, offset + PAGE_SIZE - 1, 0, 1);
1162 truncate_inode_pages(mapping, offset);
1163 goto out_truncate;
1164
1165 do_expand:
1166 limit = current->signal->rlim[RLIMIT_FSIZE].rlim_cur;
1167 if (limit != RLIM_INFINITY && offset > limit) {
1168 spin_unlock(&inode->i_lock);
1169 goto out_sig;
1170 }
1171 if (offset > inode->i_sb->s_maxbytes) {
1172 spin_unlock(&inode->i_lock);
1173 goto out_big;
1174 }
1175 i_size_write(inode, offset);
1176 spin_unlock(&inode->i_lock);
1177 out_truncate:
1178 if (inode->i_op && inode->i_op->truncate)
1179 inode->i_op->truncate(inode);
1180 return 0;
1181 out_sig:
1182 send_sig(SIGXFSZ, current, 0);
1183 out_big:
1184 return -EFBIG;
1185 out_busy:
1186 return -ETXTBSY;
1187 }
1188
1189 int cifs_setattr(struct dentry *direntry, struct iattr *attrs)
1190 {
1191 int xid;
1192 struct cifs_sb_info *cifs_sb;
1193 struct cifsTconInfo *pTcon;
1194 char *full_path = NULL;
1195 int rc = -EACCES;
1196 struct cifsFileInfo *open_file = NULL;
1197 FILE_BASIC_INFO time_buf;
1198 int set_time = FALSE;
1199 __u64 mode = 0xFFFFFFFFFFFFFFFFULL;
1200 __u64 uid = 0xFFFFFFFFFFFFFFFFULL;
1201 __u64 gid = 0xFFFFFFFFFFFFFFFFULL;
1202 struct cifsInodeInfo *cifsInode;
1203
1204 xid = GetXid();
1205
1206 cFYI(1, ("setattr on file %s attrs->iavalid 0x%x",
1207 direntry->d_name.name, attrs->ia_valid));
1208
1209 cifs_sb = CIFS_SB(direntry->d_inode->i_sb);
1210 pTcon = cifs_sb->tcon;
1211
1212 if ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_PERM) == 0) {
1213 /* check if we have permission to change attrs */
1214 rc = inode_change_ok(direntry->d_inode, attrs);
1215 if(rc < 0) {
1216 FreeXid(xid);
1217 return rc;
1218 } else
1219 rc = 0;
1220 }
1221
1222 full_path = build_path_from_dentry(direntry);
1223 if (full_path == NULL) {
1224 FreeXid(xid);
1225 return -ENOMEM;
1226 }
1227 cifsInode = CIFS_I(direntry->d_inode);
1228
1229 /* BB check if we need to refresh inode from server now ? BB */
1230
1231 /* need to flush data before changing file size on server */
1232 filemap_write_and_wait(direntry->d_inode->i_mapping);
1233
1234 if (attrs->ia_valid & ATTR_SIZE) {
1235 /* To avoid spurious oplock breaks from server, in the case of
1236 inodes that we already have open, avoid doing path based
1237 setting of file size if we can do it by handle.
1238 This keeps our caching token (oplock) and avoids timeouts
1239 when the local oplock break takes longer to flush
1240 writebehind data than the SMB timeout for the SetPathInfo
1241 request would allow */
1242
1243 open_file = find_writable_file(cifsInode);
1244 if (open_file) {
1245 __u16 nfid = open_file->netfid;
1246 __u32 npid = open_file->pid;
1247 rc = CIFSSMBSetFileSize(xid, pTcon, attrs->ia_size,
1248 nfid, npid, FALSE);
1249 atomic_dec(&open_file->wrtPending);
1250 cFYI(1,("SetFSize for attrs rc = %d", rc));
1251 if((rc == -EINVAL) || (rc == -EOPNOTSUPP)) {
1252 int bytes_written;
1253 rc = CIFSSMBWrite(xid, pTcon,
1254 nfid, 0, attrs->ia_size,
1255 &bytes_written, NULL, NULL,
1256 1 /* 45 seconds */);
1257 cFYI(1,("Wrt seteof rc %d", rc));
1258 }
1259 } else
1260 rc = -EINVAL;
1261
1262 if (rc != 0) {
1263 /* Set file size by pathname rather than by handle
1264 either because no valid, writeable file handle for
1265 it was found or because there was an error setting
1266 it by handle */
1267 rc = CIFSSMBSetEOF(xid, pTcon, full_path,
1268 attrs->ia_size, FALSE,
1269 cifs_sb->local_nls,
1270 cifs_sb->mnt_cifs_flags &
1271 CIFS_MOUNT_MAP_SPECIAL_CHR);
1272 cFYI(1, ("SetEOF by path (setattrs) rc = %d", rc));
1273 if((rc == -EINVAL) || (rc == -EOPNOTSUPP)) {
1274 __u16 netfid;
1275 int oplock = FALSE;
1276
1277 rc = SMBLegacyOpen(xid, pTcon, full_path,
1278 FILE_OPEN,
1279 SYNCHRONIZE | FILE_WRITE_ATTRIBUTES,
1280 CREATE_NOT_DIR, &netfid, &oplock,
1281 NULL, cifs_sb->local_nls,
1282 cifs_sb->mnt_cifs_flags &
1283 CIFS_MOUNT_MAP_SPECIAL_CHR);
1284 if (rc==0) {
1285 int bytes_written;
1286 rc = CIFSSMBWrite(xid, pTcon,
1287 netfid, 0,
1288 attrs->ia_size,
1289 &bytes_written, NULL,
1290 NULL, 1 /* 45 sec */);
1291 cFYI(1,("wrt seteof rc %d",rc));
1292 CIFSSMBClose(xid, pTcon, netfid);
1293 }
1294
1295 }
1296 }
1297
1298 /* Server is ok setting allocation size implicitly - no need
1299 to call:
1300 CIFSSMBSetEOF(xid, pTcon, full_path, attrs->ia_size, TRUE,
1301 cifs_sb->local_nls);
1302 */
1303
1304 if (rc == 0) {
1305 rc = cifs_vmtruncate(direntry->d_inode, attrs->ia_size);
1306 cifs_truncate_page(direntry->d_inode->i_mapping,
1307 direntry->d_inode->i_size);
1308 } else
1309 goto cifs_setattr_exit;
1310 }
1311 if (attrs->ia_valid & ATTR_UID) {
1312 cFYI(1, ("UID changed to %d", attrs->ia_uid));
1313 uid = attrs->ia_uid;
1314 }
1315 if (attrs->ia_valid & ATTR_GID) {
1316 cFYI(1, ("GID changed to %d", attrs->ia_gid));
1317 gid = attrs->ia_gid;
1318 }
1319
1320 time_buf.Attributes = 0;
1321 if (attrs->ia_valid & ATTR_MODE) {
1322 cFYI(1, ("Mode changed to 0x%x", attrs->ia_mode));
1323 mode = attrs->ia_mode;
1324 }
1325
1326 if ((cifs_sb->tcon->ses->capabilities & CAP_UNIX)
1327 && (attrs->ia_valid & (ATTR_MODE | ATTR_GID | ATTR_UID)))
1328 rc = CIFSSMBUnixSetPerms(xid, pTcon, full_path, mode, uid, gid,
1329 0 /* dev_t */, cifs_sb->local_nls,
1330 cifs_sb->mnt_cifs_flags &
1331 CIFS_MOUNT_MAP_SPECIAL_CHR);
1332 else if (attrs->ia_valid & ATTR_MODE) {
1333 rc = 0;
1334 if ((mode & S_IWUGO) == 0) /* not writeable */ {
1335 if ((cifsInode->cifsAttrs & ATTR_READONLY) == 0)
1336 time_buf.Attributes =
1337 cpu_to_le32(cifsInode->cifsAttrs |
1338 ATTR_READONLY);
1339 } else if ((mode & S_IWUGO) == S_IWUGO) {
1340 if (cifsInode->cifsAttrs & ATTR_READONLY)
1341 time_buf.Attributes =
1342 cpu_to_le32(cifsInode->cifsAttrs &
1343 (~ATTR_READONLY));
1344 }
1345 /* BB to be implemented -
1346 via Windows security descriptors or streams */
1347 /* CIFSSMBWinSetPerms(xid, pTcon, full_path, mode, uid, gid,
1348 cifs_sb->local_nls); */
1349 }
1350
1351 if (attrs->ia_valid & ATTR_ATIME) {
1352 set_time = TRUE;
1353 time_buf.LastAccessTime =
1354 cpu_to_le64(cifs_UnixTimeToNT(attrs->ia_atime));
1355 } else
1356 time_buf.LastAccessTime = 0;
1357
1358 if (attrs->ia_valid & ATTR_MTIME) {
1359 set_time = TRUE;
1360 time_buf.LastWriteTime =
1361 cpu_to_le64(cifs_UnixTimeToNT(attrs->ia_mtime));
1362 } else
1363 time_buf.LastWriteTime = 0;
1364 /* Do not set ctime explicitly unless other time
1365 stamps are changed explicitly (i.e. by utime()
1366 since we would then have a mix of client and
1367 server times */
1368
1369 if (set_time && (attrs->ia_valid & ATTR_CTIME)) {
1370 set_time = TRUE;
1371 /* Although Samba throws this field away
1372 it may be useful to Windows - but we do
1373 not want to set ctime unless some other
1374 timestamp is changing */
1375 cFYI(1, ("CIFS - CTIME changed"));
1376 time_buf.ChangeTime =
1377 cpu_to_le64(cifs_UnixTimeToNT(attrs->ia_ctime));
1378 } else
1379 time_buf.ChangeTime = 0;
1380
1381 if (set_time || time_buf.Attributes) {
1382 time_buf.CreationTime = 0; /* do not change */
1383 /* In the future we should experiment - try setting timestamps
1384 via Handle (SetFileInfo) instead of by path */
1385 if (!(pTcon->ses->flags & CIFS_SES_NT4))
1386 rc = CIFSSMBSetTimes(xid, pTcon, full_path, &time_buf,
1387 cifs_sb->local_nls,
1388 cifs_sb->mnt_cifs_flags &
1389 CIFS_MOUNT_MAP_SPECIAL_CHR);
1390 else
1391 rc = -EOPNOTSUPP;
1392
1393 if (rc == -EOPNOTSUPP) {
1394 int oplock = FALSE;
1395 __u16 netfid;
1396
1397 cFYI(1, ("calling SetFileInfo since SetPathInfo for "
1398 "times not supported by this server"));
1399 /* BB we could scan to see if we already have it open
1400 and pass in pid of opener to function */
1401 rc = CIFSSMBOpen(xid, pTcon, full_path, FILE_OPEN,
1402 SYNCHRONIZE | FILE_WRITE_ATTRIBUTES,
1403 CREATE_NOT_DIR, &netfid, &oplock,
1404 NULL, cifs_sb->local_nls,
1405 cifs_sb->mnt_cifs_flags &
1406 CIFS_MOUNT_MAP_SPECIAL_CHR);
1407 if (rc==0) {
1408 rc = CIFSSMBSetFileTimes(xid, pTcon, &time_buf,
1409 netfid);
1410 CIFSSMBClose(xid, pTcon, netfid);
1411 } else {
1412 /* BB For even older servers we could convert time_buf
1413 into old DOS style which uses two second
1414 granularity */
1415
1416 /* rc = CIFSSMBSetTimesLegacy(xid, pTcon, full_path,
1417 &time_buf, cifs_sb->local_nls); */
1418 }
1419 }
1420 /* Even if error on time set, no sense failing the call if
1421 the server would set the time to a reasonable value anyway,
1422 and this check ensures that we are not being called from
1423 sys_utimes in which case we ought to fail the call back to
1424 the user when the server rejects the call */
1425 if((rc) && (attrs->ia_valid &
1426 (ATTR_MODE | ATTR_GID | ATTR_UID | ATTR_SIZE)))
1427 rc = 0;
1428 }
1429
1430 /* do not need local check to inode_check_ok since the server does
1431 that */
1432 if (!rc)
1433 rc = inode_setattr(direntry->d_inode, attrs);
1434 cifs_setattr_exit:
1435 kfree(full_path);
1436 FreeXid(xid);
1437 return rc;
1438 }
1439
1440 #if 0
1441 void cifs_delete_inode(struct inode *inode)
1442 {
1443 cFYI(1, ("In cifs_delete_inode, inode = 0x%p", inode));
1444 /* may have to add back in if and when safe distributed caching of
1445 directories added e.g. via FindNotify */
1446 }
1447 #endif
Linux kernel - Deliverables
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