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[mirror_ubuntu-zesty-kernel.git] / fs / cifs / inode.c
1 /*
2 * fs/cifs/inode.c
3 *
4 * Copyright (C) International Business Machines Corp., 2002,2007
5 * Author(s): Steve French (sfrench@us.ibm.com)
6 *
7 * This library is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU Lesser General Public License as published
9 * by the Free Software Foundation; either version 2.1 of the License, or
10 * (at your option) any later version.
11 *
12 * This library is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See
15 * the GNU Lesser General Public License for more details.
16 *
17 * You should have received a copy of the GNU Lesser General Public License
18 * along with this library; if not, write to the Free Software
19 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
20 */
21 #include <linux/fs.h>
22 #include <linux/stat.h>
23 #include <linux/pagemap.h>
24 #include <asm/div64.h>
25 #include "cifsfs.h"
26 #include "cifspdu.h"
27 #include "cifsglob.h"
28 #include "cifsproto.h"
29 #include "cifs_debug.h"
30 #include "cifs_fs_sb.h"
31
32 int cifs_get_inode_info_unix(struct inode **pinode,
33 const unsigned char *search_path, struct super_block *sb, int xid)
34 {
35 int rc = 0;
36 FILE_UNIX_BASIC_INFO findData;
37 struct cifsTconInfo *pTcon;
38 struct inode *inode;
39 struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
40 char *tmp_path;
41
42 pTcon = cifs_sb->tcon;
43 cFYI(1, ("Getting info on %s", search_path));
44 /* could have done a find first instead but this returns more info */
45 rc = CIFSSMBUnixQPathInfo(xid, pTcon, search_path, &findData,
46 cifs_sb->local_nls, cifs_sb->mnt_cifs_flags &
47 CIFS_MOUNT_MAP_SPECIAL_CHR);
48 /* dump_mem("\nUnixQPathInfo return data", &findData,
49 sizeof(findData)); */
50 if (rc) {
51 if (rc == -EREMOTE) {
52 tmp_path =
53 kmalloc(strnlen(pTcon->treeName,
54 MAX_TREE_SIZE + 1) +
55 strnlen(search_path, MAX_PATHCONF) + 1,
56 GFP_KERNEL);
57 if (tmp_path == NULL) {
58 return -ENOMEM;
59 }
60 /* have to skip first of the double backslash of
61 UNC name */
62 strncpy(tmp_path, pTcon->treeName, MAX_TREE_SIZE);
63 strncat(tmp_path, search_path, MAX_PATHCONF);
64 rc = connect_to_dfs_path(xid, pTcon->ses,
65 /* treename + */ tmp_path,
66 cifs_sb->local_nls,
67 cifs_sb->mnt_cifs_flags &
68 CIFS_MOUNT_MAP_SPECIAL_CHR);
69 kfree(tmp_path);
70
71 /* BB fix up inode etc. */
72 } else if (rc) {
73 return rc;
74 }
75 } else {
76 struct cifsInodeInfo *cifsInfo;
77 __u32 type = le32_to_cpu(findData.Type);
78 __u64 num_of_bytes = le64_to_cpu(findData.NumOfBytes);
79 __u64 end_of_file = le64_to_cpu(findData.EndOfFile);
80
81 /* get new inode */
82 if (*pinode == NULL) {
83 *pinode = new_inode(sb);
84 if (*pinode == NULL)
85 return -ENOMEM;
86 /* Is an i_ino of zero legal? */
87 /* Are there sanity checks we can use to ensure that
88 the server is really filling in that field? */
89 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM) {
90 (*pinode)->i_ino =
91 (unsigned long)findData.UniqueId;
92 } /* note ino incremented to unique num in new_inode */
93 if (sb->s_flags & MS_NOATIME)
94 (*pinode)->i_flags |= S_NOATIME | S_NOCMTIME;
95
96 insert_inode_hash(*pinode);
97 }
98
99 inode = *pinode;
100 cifsInfo = CIFS_I(inode);
101
102 cFYI(1, ("Old time %ld", cifsInfo->time));
103 cifsInfo->time = jiffies;
104 cFYI(1, ("New time %ld", cifsInfo->time));
105 /* this is ok to set on every inode revalidate */
106 atomic_set(&cifsInfo->inUse, 1);
107
108 inode->i_atime =
109 cifs_NTtimeToUnix(le64_to_cpu(findData.LastAccessTime));
110 inode->i_mtime =
111 cifs_NTtimeToUnix(le64_to_cpu
112 (findData.LastModificationTime));
113 inode->i_ctime =
114 cifs_NTtimeToUnix(le64_to_cpu(findData.LastStatusChange));
115 inode->i_mode = le64_to_cpu(findData.Permissions);
116 /* since we set the inode type below we need to mask off
117 to avoid strange results if bits set above */
118 inode->i_mode &= ~S_IFMT;
119 if (type == UNIX_FILE) {
120 inode->i_mode |= S_IFREG;
121 } else if (type == UNIX_SYMLINK) {
122 inode->i_mode |= S_IFLNK;
123 } else if (type == UNIX_DIR) {
124 inode->i_mode |= S_IFDIR;
125 } else if (type == UNIX_CHARDEV) {
126 inode->i_mode |= S_IFCHR;
127 inode->i_rdev = MKDEV(le64_to_cpu(findData.DevMajor),
128 le64_to_cpu(findData.DevMinor) & MINORMASK);
129 } else if (type == UNIX_BLOCKDEV) {
130 inode->i_mode |= S_IFBLK;
131 inode->i_rdev = MKDEV(le64_to_cpu(findData.DevMajor),
132 le64_to_cpu(findData.DevMinor) & MINORMASK);
133 } else if (type == UNIX_FIFO) {
134 inode->i_mode |= S_IFIFO;
135 } else if (type == UNIX_SOCKET) {
136 inode->i_mode |= S_IFSOCK;
137 } else {
138 /* safest to call it a file if we do not know */
139 inode->i_mode |= S_IFREG;
140 cFYI(1, ("unknown type %d", type));
141 }
142
143 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_OVERR_UID)
144 inode->i_uid = cifs_sb->mnt_uid;
145 else
146 inode->i_uid = le64_to_cpu(findData.Uid);
147
148 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_OVERR_GID)
149 inode->i_gid = cifs_sb->mnt_gid;
150 else
151 inode->i_gid = le64_to_cpu(findData.Gid);
152
153 inode->i_nlink = le64_to_cpu(findData.Nlinks);
154
155 spin_lock(&inode->i_lock);
156 if (is_size_safe_to_change(cifsInfo, end_of_file)) {
157 /* can not safely change the file size here if the
158 client is writing to it due to potential races */
159 i_size_write(inode, end_of_file);
160
161 /* blksize needs to be multiple of two. So safer to default to
162 blksize and blkbits set in superblock so 2**blkbits and blksize
163 will match rather than setting to:
164 (pTcon->ses->server->maxBuf - MAX_CIFS_HDR_SIZE) & 0xFFFFFE00;*/
165
166 /* This seems incredibly stupid but it turns out that i_blocks
167 is not related to (i_size / i_blksize), instead 512 byte size
168 is required for calculating num blocks */
169
170 /* 512 bytes (2**9) is the fake blocksize that must be used */
171 /* for this calculation */
172 inode->i_blocks = (512 - 1 + num_of_bytes) >> 9;
173 }
174 spin_unlock(&inode->i_lock);
175
176 if (num_of_bytes < end_of_file)
177 cFYI(1, ("allocation size less than end of file"));
178 cFYI(1, ("Size %ld and blocks %llu",
179 (unsigned long) inode->i_size,
180 (unsigned long long)inode->i_blocks));
181 if (S_ISREG(inode->i_mode)) {
182 cFYI(1, ("File inode"));
183 inode->i_op = &cifs_file_inode_ops;
184 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DIRECT_IO) {
185 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_BRL)
186 inode->i_fop =
187 &cifs_file_direct_nobrl_ops;
188 else
189 inode->i_fop = &cifs_file_direct_ops;
190 } else if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_BRL)
191 inode->i_fop = &cifs_file_nobrl_ops;
192 else /* not direct, send byte range locks */
193 inode->i_fop = &cifs_file_ops;
194
195 /* check if server can support readpages */
196 if (pTcon->ses->server->maxBuf <
197 PAGE_CACHE_SIZE + MAX_CIFS_HDR_SIZE)
198 inode->i_data.a_ops = &cifs_addr_ops_smallbuf;
199 else
200 inode->i_data.a_ops = &cifs_addr_ops;
201 } else if (S_ISDIR(inode->i_mode)) {
202 cFYI(1, ("Directory inode"));
203 inode->i_op = &cifs_dir_inode_ops;
204 inode->i_fop = &cifs_dir_ops;
205 } else if (S_ISLNK(inode->i_mode)) {
206 cFYI(1, ("Symbolic Link inode"));
207 inode->i_op = &cifs_symlink_inode_ops;
208 /* tmp_inode->i_fop = */ /* do not need to set to anything */
209 } else {
210 cFYI(1, ("Init special inode"));
211 init_special_inode(inode, inode->i_mode,
212 inode->i_rdev);
213 }
214 }
215 return rc;
216 }
217
218 static int decode_sfu_inode(struct inode *inode, __u64 size,
219 const unsigned char *path,
220 struct cifs_sb_info *cifs_sb, int xid)
221 {
222 int rc;
223 int oplock = FALSE;
224 __u16 netfid;
225 struct cifsTconInfo *pTcon = cifs_sb->tcon;
226 char buf[24];
227 unsigned int bytes_read;
228 char *pbuf;
229
230 pbuf = buf;
231
232 if (size == 0) {
233 inode->i_mode |= S_IFIFO;
234 return 0;
235 } else if (size < 8) {
236 return -EINVAL; /* EOPNOTSUPP? */
237 }
238
239 rc = CIFSSMBOpen(xid, pTcon, path, FILE_OPEN, GENERIC_READ,
240 CREATE_NOT_DIR, &netfid, &oplock, NULL,
241 cifs_sb->local_nls,
242 cifs_sb->mnt_cifs_flags &
243 CIFS_MOUNT_MAP_SPECIAL_CHR);
244 if (rc == 0) {
245 int buf_type = CIFS_NO_BUFFER;
246 /* Read header */
247 rc = CIFSSMBRead(xid, pTcon,
248 netfid,
249 24 /* length */, 0 /* offset */,
250 &bytes_read, &pbuf, &buf_type);
251 if ((rc == 0) && (bytes_read >= 8)) {
252 if (memcmp("IntxBLK", pbuf, 8) == 0) {
253 cFYI(1, ("Block device"));
254 inode->i_mode |= S_IFBLK;
255 if (bytes_read == 24) {
256 /* we have enough to decode dev num */
257 __u64 mjr; /* major */
258 __u64 mnr; /* minor */
259 mjr = le64_to_cpu(*(__le64 *)(pbuf+8));
260 mnr = le64_to_cpu(*(__le64 *)(pbuf+16));
261 inode->i_rdev = MKDEV(mjr, mnr);
262 }
263 } else if (memcmp("IntxCHR", pbuf, 8) == 0) {
264 cFYI(1, ("Char device"));
265 inode->i_mode |= S_IFCHR;
266 if (bytes_read == 24) {
267 /* we have enough to decode dev num */
268 __u64 mjr; /* major */
269 __u64 mnr; /* minor */
270 mjr = le64_to_cpu(*(__le64 *)(pbuf+8));
271 mnr = le64_to_cpu(*(__le64 *)(pbuf+16));
272 inode->i_rdev = MKDEV(mjr, mnr);
273 }
274 } else if (memcmp("IntxLNK", pbuf, 7) == 0) {
275 cFYI(1, ("Symlink"));
276 inode->i_mode |= S_IFLNK;
277 } else {
278 inode->i_mode |= S_IFREG; /* file? */
279 rc = -EOPNOTSUPP;
280 }
281 } else {
282 inode->i_mode |= S_IFREG; /* then it is a file */
283 rc = -EOPNOTSUPP; /* or some unknown SFU type */
284 }
285 CIFSSMBClose(xid, pTcon, netfid);
286 }
287 return rc;
288 }
289
290 #define SFBITS_MASK (S_ISVTX | S_ISGID | S_ISUID) /* SETFILEBITS valid bits */
291
292 static int get_sfu_uid_mode(struct inode *inode,
293 const unsigned char *path,
294 struct cifs_sb_info *cifs_sb, int xid)
295 {
296 #ifdef CONFIG_CIFS_XATTR
297 ssize_t rc;
298 char ea_value[4];
299 __u32 mode;
300
301 rc = CIFSSMBQueryEA(xid, cifs_sb->tcon, path, "SETFILEBITS",
302 ea_value, 4 /* size of buf */, cifs_sb->local_nls,
303 cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR);
304 if (rc < 0)
305 return (int)rc;
306 else if (rc > 3) {
307 mode = le32_to_cpu(*((__le32 *)ea_value));
308 inode->i_mode &= ~SFBITS_MASK;
309 cFYI(1, ("special bits 0%o org mode 0%o", mode, inode->i_mode));
310 inode->i_mode = (mode & SFBITS_MASK) | inode->i_mode;
311 cFYI(1, ("special mode bits 0%o", mode));
312 return 0;
313 } else {
314 return 0;
315 }
316 #else
317 return -EOPNOTSUPP;
318 #endif
319 }
320
321 int cifs_get_inode_info(struct inode **pinode,
322 const unsigned char *search_path, FILE_ALL_INFO *pfindData,
323 struct super_block *sb, int xid)
324 {
325 int rc = 0;
326 struct cifsTconInfo *pTcon;
327 struct inode *inode;
328 struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
329 char *tmp_path;
330 char *buf = NULL;
331 int adjustTZ = FALSE;
332
333 pTcon = cifs_sb->tcon;
334 cFYI(1, ("Getting info on %s", search_path));
335
336 if ((pfindData == NULL) && (*pinode != NULL)) {
337 if (CIFS_I(*pinode)->clientCanCacheRead) {
338 cFYI(1, ("No need to revalidate cached inode sizes"));
339 return rc;
340 }
341 }
342
343 /* if file info not passed in then get it from server */
344 if (pfindData == NULL) {
345 buf = kmalloc(sizeof(FILE_ALL_INFO), GFP_KERNEL);
346 if (buf == NULL)
347 return -ENOMEM;
348 pfindData = (FILE_ALL_INFO *)buf;
349 /* could do find first instead but this returns more info */
350 rc = CIFSSMBQPathInfo(xid, pTcon, search_path, pfindData,
351 0 /* not legacy */,
352 cifs_sb->local_nls, cifs_sb->mnt_cifs_flags &
353 CIFS_MOUNT_MAP_SPECIAL_CHR);
354 /* BB optimize code so we do not make the above call
355 when server claims no NT SMB support and the above call
356 failed at least once - set flag in tcon or mount */
357 if ((rc == -EOPNOTSUPP) || (rc == -EINVAL)) {
358 rc = SMBQueryInformation(xid, pTcon, search_path,
359 pfindData, cifs_sb->local_nls,
360 cifs_sb->mnt_cifs_flags &
361 CIFS_MOUNT_MAP_SPECIAL_CHR);
362 adjustTZ = TRUE;
363 }
364 }
365 /* dump_mem("\nQPathInfo return data",&findData, sizeof(findData)); */
366 if (rc) {
367 if (rc == -EREMOTE) {
368 tmp_path =
369 kmalloc(strnlen
370 (pTcon->treeName,
371 MAX_TREE_SIZE + 1) +
372 strnlen(search_path, MAX_PATHCONF) + 1,
373 GFP_KERNEL);
374 if (tmp_path == NULL) {
375 kfree(buf);
376 return -ENOMEM;
377 }
378
379 strncpy(tmp_path, pTcon->treeName, MAX_TREE_SIZE);
380 strncat(tmp_path, search_path, MAX_PATHCONF);
381 rc = connect_to_dfs_path(xid, pTcon->ses,
382 /* treename + */ tmp_path,
383 cifs_sb->local_nls,
384 cifs_sb->mnt_cifs_flags &
385 CIFS_MOUNT_MAP_SPECIAL_CHR);
386 kfree(tmp_path);
387 /* BB fix up inode etc. */
388 } else if (rc) {
389 kfree(buf);
390 return rc;
391 }
392 } else {
393 struct cifsInodeInfo *cifsInfo;
394 __u32 attr = le32_to_cpu(pfindData->Attributes);
395
396 /* get new inode */
397 if (*pinode == NULL) {
398 *pinode = new_inode(sb);
399 if (*pinode == NULL) {
400 kfree(buf);
401 return -ENOMEM;
402 }
403 /* Is an i_ino of zero legal? Can we use that to check
404 if the server supports returning inode numbers? Are
405 there other sanity checks we can use to ensure that
406 the server is really filling in that field? */
407
408 /* We can not use the IndexNumber field by default from
409 Windows or Samba (in ALL_INFO buf) but we can request
410 it explicitly. It may not be unique presumably if
411 the server has multiple devices mounted under one
412 share */
413
414 /* There may be higher info levels that work but are
415 there Windows server or network appliances for which
416 IndexNumber field is not guaranteed unique? */
417
418 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM) {
419 int rc1 = 0;
420 __u64 inode_num;
421
422 rc1 = CIFSGetSrvInodeNumber(xid, pTcon,
423 search_path, &inode_num,
424 cifs_sb->local_nls,
425 cifs_sb->mnt_cifs_flags &
426 CIFS_MOUNT_MAP_SPECIAL_CHR);
427 if (rc1) {
428 cFYI(1, ("GetSrvInodeNum rc %d", rc1));
429 /* BB EOPNOSUPP disable SERVER_INUM? */
430 } else /* do we need cast or hash to ino? */
431 (*pinode)->i_ino = inode_num;
432 } /* else ino incremented to unique num in new_inode*/
433 if (sb->s_flags & MS_NOATIME)
434 (*pinode)->i_flags |= S_NOATIME | S_NOCMTIME;
435 insert_inode_hash(*pinode);
436 }
437 inode = *pinode;
438 cifsInfo = CIFS_I(inode);
439 cifsInfo->cifsAttrs = attr;
440 cFYI(1, ("Old time %ld", cifsInfo->time));
441 cifsInfo->time = jiffies;
442 cFYI(1, ("New time %ld", cifsInfo->time));
443
444 /* blksize needs to be multiple of two. So safer to default to
445 blksize and blkbits set in superblock so 2**blkbits and blksize
446 will match rather than setting to:
447 (pTcon->ses->server->maxBuf - MAX_CIFS_HDR_SIZE) & 0xFFFFFE00;*/
448
449 /* Linux can not store file creation time so ignore it */
450 if (pfindData->LastAccessTime)
451 inode->i_atime = cifs_NTtimeToUnix
452 (le64_to_cpu(pfindData->LastAccessTime));
453 else /* do not need to use current_fs_time - time not stored */
454 inode->i_atime = CURRENT_TIME;
455 inode->i_mtime =
456 cifs_NTtimeToUnix(le64_to_cpu(pfindData->LastWriteTime));
457 inode->i_ctime =
458 cifs_NTtimeToUnix(le64_to_cpu(pfindData->ChangeTime));
459 cFYI(0, ("Attributes came in as 0x%x", attr));
460 if (adjustTZ && (pTcon->ses) && (pTcon->ses->server)) {
461 inode->i_ctime.tv_sec += pTcon->ses->server->timeAdj;
462 inode->i_mtime.tv_sec += pTcon->ses->server->timeAdj;
463 }
464
465 /* set default mode. will override for dirs below */
466 if (atomic_read(&cifsInfo->inUse) == 0)
467 /* new inode, can safely set these fields */
468 inode->i_mode = cifs_sb->mnt_file_mode;
469 else /* since we set the inode type below we need to mask off
470 to avoid strange results if type changes and both
471 get orred in */
472 inode->i_mode &= ~S_IFMT;
473 /* if (attr & ATTR_REPARSE) */
474 /* We no longer handle these as symlinks because we could not
475 follow them due to the absolute path with drive letter */
476 if (attr & ATTR_DIRECTORY) {
477 /* override default perms since we do not do byte range locking
478 on dirs */
479 inode->i_mode = cifs_sb->mnt_dir_mode;
480 inode->i_mode |= S_IFDIR;
481 } else if ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_UNX_EMUL) &&
482 (cifsInfo->cifsAttrs & ATTR_SYSTEM) &&
483 /* No need to le64 convert size of zero */
484 (pfindData->EndOfFile == 0)) {
485 inode->i_mode = cifs_sb->mnt_file_mode;
486 inode->i_mode |= S_IFIFO;
487 /* BB Finish for SFU style symlinks and devices */
488 } else if ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_UNX_EMUL) &&
489 (cifsInfo->cifsAttrs & ATTR_SYSTEM)) {
490 if (decode_sfu_inode(inode,
491 le64_to_cpu(pfindData->EndOfFile),
492 search_path,
493 cifs_sb, xid)) {
494 cFYI(1, ("Unrecognized sfu inode type"));
495 }
496 cFYI(1, ("sfu mode 0%o", inode->i_mode));
497 } else {
498 inode->i_mode |= S_IFREG;
499 /* treat the dos attribute of read-only as read-only
500 mode e.g. 555 */
501 if (cifsInfo->cifsAttrs & ATTR_READONLY)
502 inode->i_mode &= ~(S_IWUGO);
503 else if ((inode->i_mode & S_IWUGO) == 0)
504 /* the ATTR_READONLY flag may have been */
505 /* changed on server -- set any w bits */
506 /* allowed by mnt_file_mode */
507 inode->i_mode |= (S_IWUGO &
508 cifs_sb->mnt_file_mode);
509 /* BB add code here -
510 validate if device or weird share or device type? */
511 }
512
513 spin_lock(&inode->i_lock);
514 if (is_size_safe_to_change(cifsInfo, le64_to_cpu(pfindData->EndOfFile))) {
515 /* can not safely shrink the file size here if the
516 client is writing to it due to potential races */
517 i_size_write(inode, le64_to_cpu(pfindData->EndOfFile));
518
519 /* 512 bytes (2**9) is the fake blocksize that must be
520 used for this calculation */
521 inode->i_blocks = (512 - 1 + le64_to_cpu(
522 pfindData->AllocationSize)) >> 9;
523 }
524 spin_unlock(&inode->i_lock);
525
526 inode->i_nlink = le32_to_cpu(pfindData->NumberOfLinks);
527
528 /* BB fill in uid and gid here? with help from winbind?
529 or retrieve from NTFS stream extended attribute */
530 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_UNX_EMUL) {
531 /* fill in uid, gid, mode from server ACL */
532 /* BB FIXME this should also take into account the
533 * default uid specified on mount if present */
534 get_sfu_uid_mode(inode, search_path, cifs_sb, xid);
535 } else if (atomic_read(&cifsInfo->inUse) == 0) {
536 inode->i_uid = cifs_sb->mnt_uid;
537 inode->i_gid = cifs_sb->mnt_gid;
538 /* set so we do not keep refreshing these fields with
539 bad data after user has changed them in memory */
540 atomic_set(&cifsInfo->inUse, 1);
541 }
542
543 if (S_ISREG(inode->i_mode)) {
544 cFYI(1, ("File inode"));
545 inode->i_op = &cifs_file_inode_ops;
546 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DIRECT_IO) {
547 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_BRL)
548 inode->i_fop =
549 &cifs_file_direct_nobrl_ops;
550 else
551 inode->i_fop = &cifs_file_direct_ops;
552 } else if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_BRL)
553 inode->i_fop = &cifs_file_nobrl_ops;
554 else /* not direct, send byte range locks */
555 inode->i_fop = &cifs_file_ops;
556
557 if (pTcon->ses->server->maxBuf <
558 PAGE_CACHE_SIZE + MAX_CIFS_HDR_SIZE)
559 inode->i_data.a_ops = &cifs_addr_ops_smallbuf;
560 else
561 inode->i_data.a_ops = &cifs_addr_ops;
562 } else if (S_ISDIR(inode->i_mode)) {
563 cFYI(1, ("Directory inode"));
564 inode->i_op = &cifs_dir_inode_ops;
565 inode->i_fop = &cifs_dir_ops;
566 } else if (S_ISLNK(inode->i_mode)) {
567 cFYI(1, ("Symbolic Link inode"));
568 inode->i_op = &cifs_symlink_inode_ops;
569 } else {
570 init_special_inode(inode, inode->i_mode,
571 inode->i_rdev);
572 }
573 }
574 kfree(buf);
575 return rc;
576 }
577
578 /* gets root inode */
579 void cifs_read_inode(struct inode *inode)
580 {
581 int xid;
582 struct cifs_sb_info *cifs_sb;
583
584 cifs_sb = CIFS_SB(inode->i_sb);
585 xid = GetXid();
586 if (cifs_sb->tcon->ses->capabilities & CAP_UNIX)
587 cifs_get_inode_info_unix(&inode, "", inode->i_sb, xid);
588 else
589 cifs_get_inode_info(&inode, "", NULL, inode->i_sb, xid);
590 /* can not call macro FreeXid here since in a void func */
591 _FreeXid(xid);
592 }
593
594 int cifs_unlink(struct inode *inode, struct dentry *direntry)
595 {
596 int rc = 0;
597 int xid;
598 struct cifs_sb_info *cifs_sb;
599 struct cifsTconInfo *pTcon;
600 char *full_path = NULL;
601 struct cifsInodeInfo *cifsInode;
602 FILE_BASIC_INFO *pinfo_buf;
603
604 cFYI(1, ("cifs_unlink, inode = 0x%p", inode));
605
606 xid = GetXid();
607
608 if (inode)
609 cifs_sb = CIFS_SB(inode->i_sb);
610 else
611 cifs_sb = CIFS_SB(direntry->d_sb);
612 pTcon = cifs_sb->tcon;
613
614 /* Unlink can be called from rename so we can not grab the sem here
615 since we deadlock otherwise */
616 /* mutex_lock(&direntry->d_sb->s_vfs_rename_mutex);*/
617 full_path = build_path_from_dentry(direntry);
618 /* mutex_unlock(&direntry->d_sb->s_vfs_rename_mutex);*/
619 if (full_path == NULL) {
620 FreeXid(xid);
621 return -ENOMEM;
622 }
623 rc = CIFSSMBDelFile(xid, pTcon, full_path, cifs_sb->local_nls,
624 cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR);
625
626 if (!rc) {
627 if (direntry->d_inode)
628 drop_nlink(direntry->d_inode);
629 } else if (rc == -ENOENT) {
630 d_drop(direntry);
631 } else if (rc == -ETXTBSY) {
632 int oplock = FALSE;
633 __u16 netfid;
634
635 rc = CIFSSMBOpen(xid, pTcon, full_path, FILE_OPEN, DELETE,
636 CREATE_NOT_DIR | CREATE_DELETE_ON_CLOSE,
637 &netfid, &oplock, NULL, cifs_sb->local_nls,
638 cifs_sb->mnt_cifs_flags &
639 CIFS_MOUNT_MAP_SPECIAL_CHR);
640 if (rc == 0) {
641 CIFSSMBRenameOpenFile(xid, pTcon, netfid, NULL,
642 cifs_sb->local_nls,
643 cifs_sb->mnt_cifs_flags &
644 CIFS_MOUNT_MAP_SPECIAL_CHR);
645 CIFSSMBClose(xid, pTcon, netfid);
646 if (direntry->d_inode)
647 drop_nlink(direntry->d_inode);
648 }
649 } else if (rc == -EACCES) {
650 /* try only if r/o attribute set in local lookup data? */
651 pinfo_buf = kzalloc(sizeof(FILE_BASIC_INFO), GFP_KERNEL);
652 if (pinfo_buf) {
653 /* ATTRS set to normal clears r/o bit */
654 pinfo_buf->Attributes = cpu_to_le32(ATTR_NORMAL);
655 if (!(pTcon->ses->flags & CIFS_SES_NT4))
656 rc = CIFSSMBSetTimes(xid, pTcon, full_path,
657 pinfo_buf,
658 cifs_sb->local_nls,
659 cifs_sb->mnt_cifs_flags &
660 CIFS_MOUNT_MAP_SPECIAL_CHR);
661 else
662 rc = -EOPNOTSUPP;
663
664 if (rc == -EOPNOTSUPP) {
665 int oplock = FALSE;
666 __u16 netfid;
667 /* rc = CIFSSMBSetAttrLegacy(xid, pTcon,
668 full_path,
669 (__u16)ATTR_NORMAL,
670 cifs_sb->local_nls);
671 For some strange reason it seems that NT4 eats the
672 old setattr call without actually setting the
673 attributes so on to the third attempted workaround
674 */
675
676 /* BB could scan to see if we already have it open
677 and pass in pid of opener to function */
678 rc = CIFSSMBOpen(xid, pTcon, full_path,
679 FILE_OPEN, SYNCHRONIZE |
680 FILE_WRITE_ATTRIBUTES, 0,
681 &netfid, &oplock, NULL,
682 cifs_sb->local_nls,
683 cifs_sb->mnt_cifs_flags &
684 CIFS_MOUNT_MAP_SPECIAL_CHR);
685 if (rc == 0) {
686 rc = CIFSSMBSetFileTimes(xid, pTcon,
687 pinfo_buf,
688 netfid);
689 CIFSSMBClose(xid, pTcon, netfid);
690 }
691 }
692 kfree(pinfo_buf);
693 }
694 if (rc == 0) {
695 rc = CIFSSMBDelFile(xid, pTcon, full_path,
696 cifs_sb->local_nls,
697 cifs_sb->mnt_cifs_flags &
698 CIFS_MOUNT_MAP_SPECIAL_CHR);
699 if (!rc) {
700 if (direntry->d_inode)
701 drop_nlink(direntry->d_inode);
702 } else if (rc == -ETXTBSY) {
703 int oplock = FALSE;
704 __u16 netfid;
705
706 rc = CIFSSMBOpen(xid, pTcon, full_path,
707 FILE_OPEN, DELETE,
708 CREATE_NOT_DIR |
709 CREATE_DELETE_ON_CLOSE,
710 &netfid, &oplock, NULL,
711 cifs_sb->local_nls,
712 cifs_sb->mnt_cifs_flags &
713 CIFS_MOUNT_MAP_SPECIAL_CHR);
714 if (rc == 0) {
715 CIFSSMBRenameOpenFile(xid, pTcon,
716 netfid, NULL,
717 cifs_sb->local_nls,
718 cifs_sb->mnt_cifs_flags &
719 CIFS_MOUNT_MAP_SPECIAL_CHR);
720 CIFSSMBClose(xid, pTcon, netfid);
721 if (direntry->d_inode)
722 drop_nlink(direntry->d_inode);
723 }
724 /* BB if rc = -ETXTBUSY goto the rename logic BB */
725 }
726 }
727 }
728 if (direntry->d_inode) {
729 cifsInode = CIFS_I(direntry->d_inode);
730 cifsInode->time = 0; /* will force revalidate to get info
731 when needed */
732 direntry->d_inode->i_ctime = current_fs_time(inode->i_sb);
733 }
734 if (inode) {
735 inode->i_ctime = inode->i_mtime = current_fs_time(inode->i_sb);
736 cifsInode = CIFS_I(inode);
737 cifsInode->time = 0; /* force revalidate of dir as well */
738 }
739
740 kfree(full_path);
741 FreeXid(xid);
742 return rc;
743 }
744
745 static void posix_fill_in_inode(struct inode *tmp_inode,
746 FILE_UNIX_BASIC_INFO *pData, int *pobject_type, int isNewInode)
747 {
748 loff_t local_size;
749 struct timespec local_mtime;
750
751 struct cifsInodeInfo *cifsInfo = CIFS_I(tmp_inode);
752 struct cifs_sb_info *cifs_sb = CIFS_SB(tmp_inode->i_sb);
753
754 __u32 type = le32_to_cpu(pData->Type);
755 __u64 num_of_bytes = le64_to_cpu(pData->NumOfBytes);
756 __u64 end_of_file = le64_to_cpu(pData->EndOfFile);
757 cifsInfo->time = jiffies;
758 atomic_inc(&cifsInfo->inUse);
759
760 /* save mtime and size */
761 local_mtime = tmp_inode->i_mtime;
762 local_size = tmp_inode->i_size;
763
764 tmp_inode->i_atime =
765 cifs_NTtimeToUnix(le64_to_cpu(pData->LastAccessTime));
766 tmp_inode->i_mtime =
767 cifs_NTtimeToUnix(le64_to_cpu(pData->LastModificationTime));
768 tmp_inode->i_ctime =
769 cifs_NTtimeToUnix(le64_to_cpu(pData->LastStatusChange));
770
771 tmp_inode->i_mode = le64_to_cpu(pData->Permissions);
772 /* since we set the inode type below we need to mask off type
773 to avoid strange results if bits above were corrupt */
774 tmp_inode->i_mode &= ~S_IFMT;
775 if (type == UNIX_FILE) {
776 *pobject_type = DT_REG;
777 tmp_inode->i_mode |= S_IFREG;
778 } else if (type == UNIX_SYMLINK) {
779 *pobject_type = DT_LNK;
780 tmp_inode->i_mode |= S_IFLNK;
781 } else if (type == UNIX_DIR) {
782 *pobject_type = DT_DIR;
783 tmp_inode->i_mode |= S_IFDIR;
784 } else if (type == UNIX_CHARDEV) {
785 *pobject_type = DT_CHR;
786 tmp_inode->i_mode |= S_IFCHR;
787 tmp_inode->i_rdev = MKDEV(le64_to_cpu(pData->DevMajor),
788 le64_to_cpu(pData->DevMinor) & MINORMASK);
789 } else if (type == UNIX_BLOCKDEV) {
790 *pobject_type = DT_BLK;
791 tmp_inode->i_mode |= S_IFBLK;
792 tmp_inode->i_rdev = MKDEV(le64_to_cpu(pData->DevMajor),
793 le64_to_cpu(pData->DevMinor) & MINORMASK);
794 } else if (type == UNIX_FIFO) {
795 *pobject_type = DT_FIFO;
796 tmp_inode->i_mode |= S_IFIFO;
797 } else if (type == UNIX_SOCKET) {
798 *pobject_type = DT_SOCK;
799 tmp_inode->i_mode |= S_IFSOCK;
800 } else {
801 /* safest to just call it a file */
802 *pobject_type = DT_REG;
803 tmp_inode->i_mode |= S_IFREG;
804 cFYI(1, ("unknown inode type %d", type));
805 }
806
807 #ifdef CONFIG_CIFS_DEBUG2
808 cFYI(1, ("object type: %d", type));
809 #endif
810 tmp_inode->i_uid = le64_to_cpu(pData->Uid);
811 tmp_inode->i_gid = le64_to_cpu(pData->Gid);
812 tmp_inode->i_nlink = le64_to_cpu(pData->Nlinks);
813
814 spin_lock(&tmp_inode->i_lock);
815 if (is_size_safe_to_change(cifsInfo, end_of_file)) {
816 /* can not safely change the file size here if the
817 client is writing to it due to potential races */
818 i_size_write(tmp_inode, end_of_file);
819
820 /* 512 bytes (2**9) is the fake blocksize that must be used */
821 /* for this calculation, not the real blocksize */
822 tmp_inode->i_blocks = (512 - 1 + num_of_bytes) >> 9;
823 }
824 spin_unlock(&tmp_inode->i_lock);
825
826 if (S_ISREG(tmp_inode->i_mode)) {
827 cFYI(1, ("File inode"));
828 tmp_inode->i_op = &cifs_file_inode_ops;
829
830 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DIRECT_IO) {
831 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_BRL)
832 tmp_inode->i_fop = &cifs_file_direct_nobrl_ops;
833 else
834 tmp_inode->i_fop = &cifs_file_direct_ops;
835
836 } else if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_BRL)
837 tmp_inode->i_fop = &cifs_file_nobrl_ops;
838 else
839 tmp_inode->i_fop = &cifs_file_ops;
840
841 if ((cifs_sb->tcon) && (cifs_sb->tcon->ses) &&
842 (cifs_sb->tcon->ses->server->maxBuf <
843 PAGE_CACHE_SIZE + MAX_CIFS_HDR_SIZE))
844 tmp_inode->i_data.a_ops = &cifs_addr_ops_smallbuf;
845 else
846 tmp_inode->i_data.a_ops = &cifs_addr_ops;
847
848 if (isNewInode)
849 return; /* No sense invalidating pages for new inode
850 since we we have not started caching
851 readahead file data yet */
852
853 if (timespec_equal(&tmp_inode->i_mtime, &local_mtime) &&
854 (local_size == tmp_inode->i_size)) {
855 cFYI(1, ("inode exists but unchanged"));
856 } else {
857 /* file may have changed on server */
858 cFYI(1, ("invalidate inode, readdir detected change"));
859 invalidate_remote_inode(tmp_inode);
860 }
861 } else if (S_ISDIR(tmp_inode->i_mode)) {
862 cFYI(1, ("Directory inode"));
863 tmp_inode->i_op = &cifs_dir_inode_ops;
864 tmp_inode->i_fop = &cifs_dir_ops;
865 } else if (S_ISLNK(tmp_inode->i_mode)) {
866 cFYI(1, ("Symbolic Link inode"));
867 tmp_inode->i_op = &cifs_symlink_inode_ops;
868 /* tmp_inode->i_fop = *//* do not need to set to anything */
869 } else {
870 cFYI(1, ("Special inode"));
871 init_special_inode(tmp_inode, tmp_inode->i_mode,
872 tmp_inode->i_rdev);
873 }
874 }
875
876 int cifs_mkdir(struct inode *inode, struct dentry *direntry, int mode)
877 {
878 int rc = 0;
879 int xid;
880 struct cifs_sb_info *cifs_sb;
881 struct cifsTconInfo *pTcon;
882 char *full_path = NULL;
883 struct inode *newinode = NULL;
884
885 cFYI(1, ("In cifs_mkdir, mode = 0x%x inode = 0x%p", mode, inode));
886
887 xid = GetXid();
888
889 cifs_sb = CIFS_SB(inode->i_sb);
890 pTcon = cifs_sb->tcon;
891
892 full_path = build_path_from_dentry(direntry);
893 if (full_path == NULL) {
894 FreeXid(xid);
895 return -ENOMEM;
896 }
897
898 if ((pTcon->ses->capabilities & CAP_UNIX) &&
899 (CIFS_UNIX_POSIX_PATH_OPS_CAP &
900 le64_to_cpu(pTcon->fsUnixInfo.Capability))) {
901 u32 oplock = 0;
902 FILE_UNIX_BASIC_INFO * pInfo =
903 kzalloc(sizeof(FILE_UNIX_BASIC_INFO), GFP_KERNEL);
904 if (pInfo == NULL) {
905 rc = -ENOMEM;
906 goto mkdir_out;
907 }
908
909 rc = CIFSPOSIXCreate(xid, pTcon, SMB_O_DIRECTORY | SMB_O_CREAT,
910 mode, NULL /* netfid */, pInfo, &oplock,
911 full_path, cifs_sb->local_nls,
912 cifs_sb->mnt_cifs_flags &
913 CIFS_MOUNT_MAP_SPECIAL_CHR);
914 if (rc) {
915 cFYI(1, ("posix mkdir returned 0x%x", rc));
916 d_drop(direntry);
917 } else {
918 int obj_type;
919 if (pInfo->Type == -1) /* no return info - go query */
920 goto mkdir_get_info;
921 /*BB check (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SET_UID ) to see if need
922 to set uid/gid */
923 inc_nlink(inode);
924 if (pTcon->nocase)
925 direntry->d_op = &cifs_ci_dentry_ops;
926 else
927 direntry->d_op = &cifs_dentry_ops;
928
929 newinode = new_inode(inode->i_sb);
930 if (newinode == NULL)
931 goto mkdir_get_info;
932 /* Is an i_ino of zero legal? */
933 /* Are there sanity checks we can use to ensure that
934 the server is really filling in that field? */
935 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM) {
936 newinode->i_ino =
937 (unsigned long)pInfo->UniqueId;
938 } /* note ino incremented to unique num in new_inode */
939 if (inode->i_sb->s_flags & MS_NOATIME)
940 newinode->i_flags |= S_NOATIME | S_NOCMTIME;
941 newinode->i_nlink = 2;
942
943 insert_inode_hash(newinode);
944 d_instantiate(direntry, newinode);
945
946 /* we already checked in POSIXCreate whether
947 frame was long enough */
948 posix_fill_in_inode(direntry->d_inode,
949 pInfo, &obj_type, 1 /* NewInode */);
950 #ifdef CONFIG_CIFS_DEBUG2
951 cFYI(1, ("instantiated dentry %p %s to inode %p",
952 direntry, direntry->d_name.name, newinode));
953
954 if (newinode->i_nlink != 2)
955 cFYI(1, ("unexpected number of links %d",
956 newinode->i_nlink));
957 #endif
958 }
959 kfree(pInfo);
960 goto mkdir_out;
961 }
962
963 /* BB add setting the equivalent of mode via CreateX w/ACLs */
964 rc = CIFSSMBMkDir(xid, pTcon, full_path, cifs_sb->local_nls,
965 cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR);
966 if (rc) {
967 cFYI(1, ("cifs_mkdir returned 0x%x", rc));
968 d_drop(direntry);
969 } else {
970 mkdir_get_info:
971 inc_nlink(inode);
972 if (pTcon->ses->capabilities & CAP_UNIX)
973 rc = cifs_get_inode_info_unix(&newinode, full_path,
974 inode->i_sb, xid);
975 else
976 rc = cifs_get_inode_info(&newinode, full_path, NULL,
977 inode->i_sb, xid);
978
979 if (pTcon->nocase)
980 direntry->d_op = &cifs_ci_dentry_ops;
981 else
982 direntry->d_op = &cifs_dentry_ops;
983 d_instantiate(direntry, newinode);
984 /* setting nlink not necessary except in cases where we
985 * failed to get it from the server or was set bogus */
986 if ((direntry->d_inode) && (direntry->d_inode->i_nlink < 2))
987 direntry->d_inode->i_nlink = 2;
988 if (cifs_sb->tcon->ses->capabilities & CAP_UNIX) {
989 mode &= ~current->fs->umask;
990 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SET_UID) {
991 CIFSSMBUnixSetPerms(xid, pTcon, full_path,
992 mode,
993 (__u64)current->fsuid,
994 (__u64)current->fsgid,
995 0 /* dev_t */,
996 cifs_sb->local_nls,
997 cifs_sb->mnt_cifs_flags &
998 CIFS_MOUNT_MAP_SPECIAL_CHR);
999 } else {
1000 CIFSSMBUnixSetPerms(xid, pTcon, full_path,
1001 mode, (__u64)-1,
1002 (__u64)-1, 0 /* dev_t */,
1003 cifs_sb->local_nls,
1004 cifs_sb->mnt_cifs_flags &
1005 CIFS_MOUNT_MAP_SPECIAL_CHR);
1006 }
1007 } else {
1008 /* BB to be implemented via Windows secrty descriptors
1009 eg CIFSSMBWinSetPerms(xid, pTcon, full_path, mode,
1010 -1, -1, local_nls); */
1011 if (direntry->d_inode) {
1012 direntry->d_inode->i_mode = mode;
1013 direntry->d_inode->i_mode |= S_IFDIR;
1014 if (cifs_sb->mnt_cifs_flags &
1015 CIFS_MOUNT_SET_UID) {
1016 direntry->d_inode->i_uid =
1017 current->fsuid;
1018 direntry->d_inode->i_gid =
1019 current->fsgid;
1020 }
1021 }
1022 }
1023 }
1024 mkdir_out:
1025 kfree(full_path);
1026 FreeXid(xid);
1027 return rc;
1028 }
1029
1030 int cifs_rmdir(struct inode *inode, struct dentry *direntry)
1031 {
1032 int rc = 0;
1033 int xid;
1034 struct cifs_sb_info *cifs_sb;
1035 struct cifsTconInfo *pTcon;
1036 char *full_path = NULL;
1037 struct cifsInodeInfo *cifsInode;
1038
1039 cFYI(1, ("cifs_rmdir, inode = 0x%p", inode));
1040
1041 xid = GetXid();
1042
1043 cifs_sb = CIFS_SB(inode->i_sb);
1044 pTcon = cifs_sb->tcon;
1045
1046 full_path = build_path_from_dentry(direntry);
1047 if (full_path == NULL) {
1048 FreeXid(xid);
1049 return -ENOMEM;
1050 }
1051
1052 rc = CIFSSMBRmDir(xid, pTcon, full_path, cifs_sb->local_nls,
1053 cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR);
1054
1055 if (!rc) {
1056 drop_nlink(inode);
1057 spin_lock(&direntry->d_inode->i_lock);
1058 i_size_write(direntry->d_inode, 0);
1059 clear_nlink(direntry->d_inode);
1060 spin_unlock(&direntry->d_inode->i_lock);
1061 }
1062
1063 cifsInode = CIFS_I(direntry->d_inode);
1064 cifsInode->time = 0; /* force revalidate to go get info when
1065 needed */
1066 direntry->d_inode->i_ctime = inode->i_ctime = inode->i_mtime =
1067 current_fs_time(inode->i_sb);
1068
1069 kfree(full_path);
1070 FreeXid(xid);
1071 return rc;
1072 }
1073
1074 int cifs_rename(struct inode *source_inode, struct dentry *source_direntry,
1075 struct inode *target_inode, struct dentry *target_direntry)
1076 {
1077 char *fromName;
1078 char *toName;
1079 struct cifs_sb_info *cifs_sb_source;
1080 struct cifs_sb_info *cifs_sb_target;
1081 struct cifsTconInfo *pTcon;
1082 int xid;
1083 int rc = 0;
1084
1085 xid = GetXid();
1086
1087 cifs_sb_target = CIFS_SB(target_inode->i_sb);
1088 cifs_sb_source = CIFS_SB(source_inode->i_sb);
1089 pTcon = cifs_sb_source->tcon;
1090
1091 if (pTcon != cifs_sb_target->tcon) {
1092 FreeXid(xid);
1093 return -EXDEV; /* BB actually could be allowed if same server,
1094 but different share.
1095 Might eventually add support for this */
1096 }
1097
1098 /* we already have the rename sem so we do not need to grab it again
1099 here to protect the path integrity */
1100 fromName = build_path_from_dentry(source_direntry);
1101 toName = build_path_from_dentry(target_direntry);
1102 if ((fromName == NULL) || (toName == NULL)) {
1103 rc = -ENOMEM;
1104 goto cifs_rename_exit;
1105 }
1106
1107 rc = CIFSSMBRename(xid, pTcon, fromName, toName,
1108 cifs_sb_source->local_nls,
1109 cifs_sb_source->mnt_cifs_flags &
1110 CIFS_MOUNT_MAP_SPECIAL_CHR);
1111 if (rc == -EEXIST) {
1112 /* check if they are the same file because rename of hardlinked
1113 files is a noop */
1114 FILE_UNIX_BASIC_INFO *info_buf_source;
1115 FILE_UNIX_BASIC_INFO *info_buf_target;
1116
1117 info_buf_source =
1118 kmalloc(2 * sizeof(FILE_UNIX_BASIC_INFO), GFP_KERNEL);
1119 if (info_buf_source != NULL) {
1120 info_buf_target = info_buf_source + 1;
1121 if (pTcon->ses->capabilities & CAP_UNIX)
1122 rc = CIFSSMBUnixQPathInfo(xid, pTcon, fromName,
1123 info_buf_source,
1124 cifs_sb_source->local_nls,
1125 cifs_sb_source->mnt_cifs_flags &
1126 CIFS_MOUNT_MAP_SPECIAL_CHR);
1127 /* else rc is still EEXIST so will fall through to
1128 unlink the target and retry rename */
1129 if (rc == 0) {
1130 rc = CIFSSMBUnixQPathInfo(xid, pTcon, toName,
1131 info_buf_target,
1132 cifs_sb_target->local_nls,
1133 /* remap based on source sb */
1134 cifs_sb_source->mnt_cifs_flags &
1135 CIFS_MOUNT_MAP_SPECIAL_CHR);
1136 }
1137 if ((rc == 0) &&
1138 (info_buf_source->UniqueId ==
1139 info_buf_target->UniqueId)) {
1140 /* do not rename since the files are hardlinked which
1141 is a noop */
1142 } else {
1143 /* we either can not tell the files are hardlinked
1144 (as with Windows servers) or files are not
1145 hardlinked so delete the target manually before
1146 renaming to follow POSIX rather than Windows
1147 semantics */
1148 cifs_unlink(target_inode, target_direntry);
1149 rc = CIFSSMBRename(xid, pTcon, fromName,
1150 toName,
1151 cifs_sb_source->local_nls,
1152 cifs_sb_source->mnt_cifs_flags
1153 & CIFS_MOUNT_MAP_SPECIAL_CHR);
1154 }
1155 kfree(info_buf_source);
1156 } /* if we can not get memory just leave rc as EEXIST */
1157 }
1158
1159 if (rc) {
1160 cFYI(1, ("rename rc %d", rc));
1161 }
1162
1163 if ((rc == -EIO) || (rc == -EEXIST)) {
1164 int oplock = FALSE;
1165 __u16 netfid;
1166
1167 /* BB FIXME Is Generic Read correct for rename? */
1168 /* if renaming directory - we should not say CREATE_NOT_DIR,
1169 need to test renaming open directory, also GENERIC_READ
1170 might not right be right access to request */
1171 rc = CIFSSMBOpen(xid, pTcon, fromName, FILE_OPEN, GENERIC_READ,
1172 CREATE_NOT_DIR, &netfid, &oplock, NULL,
1173 cifs_sb_source->local_nls,
1174 cifs_sb_source->mnt_cifs_flags &
1175 CIFS_MOUNT_MAP_SPECIAL_CHR);
1176 if (rc == 0) {
1177 rc = CIFSSMBRenameOpenFile(xid, pTcon, netfid, toName,
1178 cifs_sb_source->local_nls,
1179 cifs_sb_source->mnt_cifs_flags &
1180 CIFS_MOUNT_MAP_SPECIAL_CHR);
1181 CIFSSMBClose(xid, pTcon, netfid);
1182 }
1183 }
1184
1185 cifs_rename_exit:
1186 kfree(fromName);
1187 kfree(toName);
1188 FreeXid(xid);
1189 return rc;
1190 }
1191
1192 int cifs_revalidate(struct dentry *direntry)
1193 {
1194 int xid;
1195 int rc = 0;
1196 char *full_path;
1197 struct cifs_sb_info *cifs_sb;
1198 struct cifsInodeInfo *cifsInode;
1199 loff_t local_size;
1200 struct timespec local_mtime;
1201 int invalidate_inode = FALSE;
1202
1203 if (direntry->d_inode == NULL)
1204 return -ENOENT;
1205
1206 cifsInode = CIFS_I(direntry->d_inode);
1207
1208 if (cifsInode == NULL)
1209 return -ENOENT;
1210
1211 /* no sense revalidating inode info on file that no one can write */
1212 if (CIFS_I(direntry->d_inode)->clientCanCacheRead)
1213 return rc;
1214
1215 xid = GetXid();
1216
1217 cifs_sb = CIFS_SB(direntry->d_sb);
1218
1219 /* can not safely grab the rename sem here if rename calls revalidate
1220 since that would deadlock */
1221 full_path = build_path_from_dentry(direntry);
1222 if (full_path == NULL) {
1223 FreeXid(xid);
1224 return -ENOMEM;
1225 }
1226 cFYI(1, ("Revalidate: %s inode 0x%p count %d dentry: 0x%p d_time %ld "
1227 "jiffies %ld", full_path, direntry->d_inode,
1228 direntry->d_inode->i_count.counter, direntry,
1229 direntry->d_time, jiffies));
1230
1231 if (cifsInode->time == 0) {
1232 /* was set to zero previously to force revalidate */
1233 } else if (time_before(jiffies, cifsInode->time + HZ) &&
1234 lookupCacheEnabled) {
1235 if ((S_ISREG(direntry->d_inode->i_mode) == 0) ||
1236 (direntry->d_inode->i_nlink == 1)) {
1237 kfree(full_path);
1238 FreeXid(xid);
1239 return rc;
1240 } else {
1241 cFYI(1, ("Have to revalidate file due to hardlinks"));
1242 }
1243 }
1244
1245 /* save mtime and size */
1246 local_mtime = direntry->d_inode->i_mtime;
1247 local_size = direntry->d_inode->i_size;
1248
1249 if (cifs_sb->tcon->ses->capabilities & CAP_UNIX) {
1250 rc = cifs_get_inode_info_unix(&direntry->d_inode, full_path,
1251 direntry->d_sb, xid);
1252 if (rc) {
1253 cFYI(1, ("error on getting revalidate info %d", rc));
1254 /* if (rc != -ENOENT)
1255 rc = 0; */ /* BB should we cache info on
1256 certain errors? */
1257 }
1258 } else {
1259 rc = cifs_get_inode_info(&direntry->d_inode, full_path, NULL,
1260 direntry->d_sb, xid);
1261 if (rc) {
1262 cFYI(1, ("error on getting revalidate info %d", rc));
1263 /* if (rc != -ENOENT)
1264 rc = 0; */ /* BB should we cache info on
1265 certain errors? */
1266 }
1267 }
1268 /* should we remap certain errors, access denied?, to zero */
1269
1270 /* if not oplocked, we invalidate inode pages if mtime or file size
1271 had changed on server */
1272
1273 if (timespec_equal(&local_mtime, &direntry->d_inode->i_mtime) &&
1274 (local_size == direntry->d_inode->i_size)) {
1275 cFYI(1, ("cifs_revalidate - inode unchanged"));
1276 } else {
1277 /* file may have changed on server */
1278 if (cifsInode->clientCanCacheRead) {
1279 /* no need to invalidate inode pages since we were the
1280 only ones who could have modified the file and the
1281 server copy is staler than ours */
1282 } else {
1283 invalidate_inode = TRUE;
1284 }
1285 }
1286
1287 /* can not grab this sem since kernel filesys locking documentation
1288 indicates i_mutex may be taken by the kernel on lookup and rename
1289 which could deadlock if we grab the i_mutex here as well */
1290 /* mutex_lock(&direntry->d_inode->i_mutex);*/
1291 /* need to write out dirty pages here */
1292 if (direntry->d_inode->i_mapping) {
1293 /* do we need to lock inode until after invalidate completes
1294 below? */
1295 filemap_fdatawrite(direntry->d_inode->i_mapping);
1296 }
1297 if (invalidate_inode) {
1298 /* shrink_dcache not necessary now that cifs dentry ops
1299 are exported for negative dentries */
1300 /* if (S_ISDIR(direntry->d_inode->i_mode))
1301 shrink_dcache_parent(direntry); */
1302 if (S_ISREG(direntry->d_inode->i_mode)) {
1303 if (direntry->d_inode->i_mapping)
1304 filemap_fdatawait(direntry->d_inode->i_mapping);
1305 /* may eventually have to do this for open files too */
1306 if (list_empty(&(cifsInode->openFileList))) {
1307 /* changed on server - flush read ahead pages */
1308 cFYI(1, ("Invalidating read ahead data on "
1309 "closed file"));
1310 invalidate_remote_inode(direntry->d_inode);
1311 }
1312 }
1313 }
1314 /* mutex_unlock(&direntry->d_inode->i_mutex); */
1315
1316 kfree(full_path);
1317 FreeXid(xid);
1318 return rc;
1319 }
1320
1321 int cifs_getattr(struct vfsmount *mnt, struct dentry *dentry,
1322 struct kstat *stat)
1323 {
1324 int err = cifs_revalidate(dentry);
1325 if (!err) {
1326 generic_fillattr(dentry->d_inode, stat);
1327 stat->blksize = CIFS_MAX_MSGSIZE;
1328 }
1329 return err;
1330 }
1331
1332 static int cifs_truncate_page(struct address_space *mapping, loff_t from)
1333 {
1334 pgoff_t index = from >> PAGE_CACHE_SHIFT;
1335 unsigned offset = from & (PAGE_CACHE_SIZE - 1);
1336 struct page *page;
1337 char *kaddr;
1338 int rc = 0;
1339
1340 page = grab_cache_page(mapping, index);
1341 if (!page)
1342 return -ENOMEM;
1343
1344 kaddr = kmap_atomic(page, KM_USER0);
1345 memset(kaddr + offset, 0, PAGE_CACHE_SIZE - offset);
1346 flush_dcache_page(page);
1347 kunmap_atomic(kaddr, KM_USER0);
1348 unlock_page(page);
1349 page_cache_release(page);
1350 return rc;
1351 }
1352
1353 static int cifs_vmtruncate(struct inode *inode, loff_t offset)
1354 {
1355 struct address_space *mapping = inode->i_mapping;
1356 unsigned long limit;
1357
1358 spin_lock(&inode->i_lock);
1359 if (inode->i_size < offset)
1360 goto do_expand;
1361 /*
1362 * truncation of in-use swapfiles is disallowed - it would cause
1363 * subsequent swapout to scribble on the now-freed blocks.
1364 */
1365 if (IS_SWAPFILE(inode)) {
1366 spin_unlock(&inode->i_lock);
1367 goto out_busy;
1368 }
1369 i_size_write(inode, offset);
1370 spin_unlock(&inode->i_lock);
1371 unmap_mapping_range(mapping, offset + PAGE_SIZE - 1, 0, 1);
1372 truncate_inode_pages(mapping, offset);
1373 goto out_truncate;
1374
1375 do_expand:
1376 limit = current->signal->rlim[RLIMIT_FSIZE].rlim_cur;
1377 if (limit != RLIM_INFINITY && offset > limit) {
1378 spin_unlock(&inode->i_lock);
1379 goto out_sig;
1380 }
1381 if (offset > inode->i_sb->s_maxbytes) {
1382 spin_unlock(&inode->i_lock);
1383 goto out_big;
1384 }
1385 i_size_write(inode, offset);
1386 spin_unlock(&inode->i_lock);
1387 out_truncate:
1388 if (inode->i_op && inode->i_op->truncate)
1389 inode->i_op->truncate(inode);
1390 return 0;
1391 out_sig:
1392 send_sig(SIGXFSZ, current, 0);
1393 out_big:
1394 return -EFBIG;
1395 out_busy:
1396 return -ETXTBSY;
1397 }
1398
1399 int cifs_setattr(struct dentry *direntry, struct iattr *attrs)
1400 {
1401 int xid;
1402 struct cifs_sb_info *cifs_sb;
1403 struct cifsTconInfo *pTcon;
1404 char *full_path = NULL;
1405 int rc = -EACCES;
1406 struct cifsFileInfo *open_file = NULL;
1407 FILE_BASIC_INFO time_buf;
1408 int set_time = FALSE;
1409 int set_dosattr = FALSE;
1410 __u64 mode = 0xFFFFFFFFFFFFFFFFULL;
1411 __u64 uid = 0xFFFFFFFFFFFFFFFFULL;
1412 __u64 gid = 0xFFFFFFFFFFFFFFFFULL;
1413 struct cifsInodeInfo *cifsInode;
1414
1415 xid = GetXid();
1416
1417 cFYI(1, ("setattr on file %s attrs->iavalid 0x%x",
1418 direntry->d_name.name, attrs->ia_valid));
1419
1420 cifs_sb = CIFS_SB(direntry->d_inode->i_sb);
1421 pTcon = cifs_sb->tcon;
1422
1423 if ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_PERM) == 0) {
1424 /* check if we have permission to change attrs */
1425 rc = inode_change_ok(direntry->d_inode, attrs);
1426 if (rc < 0) {
1427 FreeXid(xid);
1428 return rc;
1429 } else
1430 rc = 0;
1431 }
1432
1433 full_path = build_path_from_dentry(direntry);
1434 if (full_path == NULL) {
1435 FreeXid(xid);
1436 return -ENOMEM;
1437 }
1438 cifsInode = CIFS_I(direntry->d_inode);
1439
1440 /* BB check if we need to refresh inode from server now ? BB */
1441
1442 /* need to flush data before changing file size on server */
1443 filemap_write_and_wait(direntry->d_inode->i_mapping);
1444
1445 if (attrs->ia_valid & ATTR_SIZE) {
1446 /* To avoid spurious oplock breaks from server, in the case of
1447 inodes that we already have open, avoid doing path based
1448 setting of file size if we can do it by handle.
1449 This keeps our caching token (oplock) and avoids timeouts
1450 when the local oplock break takes longer to flush
1451 writebehind data than the SMB timeout for the SetPathInfo
1452 request would allow */
1453
1454 open_file = find_writable_file(cifsInode);
1455 if (open_file) {
1456 __u16 nfid = open_file->netfid;
1457 __u32 npid = open_file->pid;
1458 rc = CIFSSMBSetFileSize(xid, pTcon, attrs->ia_size,
1459 nfid, npid, FALSE);
1460 atomic_dec(&open_file->wrtPending);
1461 cFYI(1, ("SetFSize for attrs rc = %d", rc));
1462 if ((rc == -EINVAL) || (rc == -EOPNOTSUPP)) {
1463 int bytes_written;
1464 rc = CIFSSMBWrite(xid, pTcon,
1465 nfid, 0, attrs->ia_size,
1466 &bytes_written, NULL, NULL,
1467 1 /* 45 seconds */);
1468 cFYI(1, ("Wrt seteof rc %d", rc));
1469 }
1470 } else
1471 rc = -EINVAL;
1472
1473 if (rc != 0) {
1474 /* Set file size by pathname rather than by handle
1475 either because no valid, writeable file handle for
1476 it was found or because there was an error setting
1477 it by handle */
1478 rc = CIFSSMBSetEOF(xid, pTcon, full_path,
1479 attrs->ia_size, FALSE,
1480 cifs_sb->local_nls,
1481 cifs_sb->mnt_cifs_flags &
1482 CIFS_MOUNT_MAP_SPECIAL_CHR);
1483 cFYI(1, ("SetEOF by path (setattrs) rc = %d", rc));
1484 if ((rc == -EINVAL) || (rc == -EOPNOTSUPP)) {
1485 __u16 netfid;
1486 int oplock = FALSE;
1487
1488 rc = SMBLegacyOpen(xid, pTcon, full_path,
1489 FILE_OPEN,
1490 SYNCHRONIZE | FILE_WRITE_ATTRIBUTES,
1491 CREATE_NOT_DIR, &netfid, &oplock,
1492 NULL, cifs_sb->local_nls,
1493 cifs_sb->mnt_cifs_flags &
1494 CIFS_MOUNT_MAP_SPECIAL_CHR);
1495 if (rc == 0) {
1496 int bytes_written;
1497 rc = CIFSSMBWrite(xid, pTcon,
1498 netfid, 0,
1499 attrs->ia_size,
1500 &bytes_written, NULL,
1501 NULL, 1 /* 45 sec */);
1502 cFYI(1, ("wrt seteof rc %d", rc));
1503 CIFSSMBClose(xid, pTcon, netfid);
1504 }
1505
1506 }
1507 }
1508
1509 /* Server is ok setting allocation size implicitly - no need
1510 to call:
1511 CIFSSMBSetEOF(xid, pTcon, full_path, attrs->ia_size, TRUE,
1512 cifs_sb->local_nls);
1513 */
1514
1515 if (rc == 0) {
1516 rc = cifs_vmtruncate(direntry->d_inode, attrs->ia_size);
1517 cifs_truncate_page(direntry->d_inode->i_mapping,
1518 direntry->d_inode->i_size);
1519 } else
1520 goto cifs_setattr_exit;
1521 }
1522 if (attrs->ia_valid & ATTR_UID) {
1523 cFYI(1, ("UID changed to %d", attrs->ia_uid));
1524 uid = attrs->ia_uid;
1525 }
1526 if (attrs->ia_valid & ATTR_GID) {
1527 cFYI(1, ("GID changed to %d", attrs->ia_gid));
1528 gid = attrs->ia_gid;
1529 }
1530
1531 time_buf.Attributes = 0;
1532 if (attrs->ia_valid & ATTR_MODE) {
1533 cFYI(1, ("Mode changed to 0x%x", attrs->ia_mode));
1534 mode = attrs->ia_mode;
1535 }
1536
1537 if ((cifs_sb->tcon->ses->capabilities & CAP_UNIX)
1538 && (attrs->ia_valid & (ATTR_MODE | ATTR_GID | ATTR_UID)))
1539 rc = CIFSSMBUnixSetPerms(xid, pTcon, full_path, mode, uid, gid,
1540 0 /* dev_t */, cifs_sb->local_nls,
1541 cifs_sb->mnt_cifs_flags &
1542 CIFS_MOUNT_MAP_SPECIAL_CHR);
1543 else if (attrs->ia_valid & ATTR_MODE) {
1544 rc = 0;
1545 if ((mode & S_IWUGO) == 0) /* not writeable */ {
1546 if ((cifsInode->cifsAttrs & ATTR_READONLY) == 0) {
1547 set_dosattr = TRUE;
1548 time_buf.Attributes =
1549 cpu_to_le32(cifsInode->cifsAttrs |
1550 ATTR_READONLY);
1551 }
1552 } else if (cifsInode->cifsAttrs & ATTR_READONLY) {
1553 /* If file is readonly on server, we would
1554 not be able to write to it - so if any write
1555 bit is enabled for user or group or other we
1556 need to at least try to remove r/o dos attr */
1557 set_dosattr = TRUE;
1558 time_buf.Attributes = cpu_to_le32(cifsInode->cifsAttrs &
1559 (~ATTR_READONLY));
1560 /* Windows ignores set to zero */
1561 if (time_buf.Attributes == 0)
1562 time_buf.Attributes |= cpu_to_le32(ATTR_NORMAL);
1563 }
1564 /* BB to be implemented -
1565 via Windows security descriptors or streams */
1566 /* CIFSSMBWinSetPerms(xid, pTcon, full_path, mode, uid, gid,
1567 cifs_sb->local_nls); */
1568 }
1569
1570 if (attrs->ia_valid & ATTR_ATIME) {
1571 set_time = TRUE;
1572 time_buf.LastAccessTime =
1573 cpu_to_le64(cifs_UnixTimeToNT(attrs->ia_atime));
1574 } else
1575 time_buf.LastAccessTime = 0;
1576
1577 if (attrs->ia_valid & ATTR_MTIME) {
1578 set_time = TRUE;
1579 time_buf.LastWriteTime =
1580 cpu_to_le64(cifs_UnixTimeToNT(attrs->ia_mtime));
1581 } else
1582 time_buf.LastWriteTime = 0;
1583 /* Do not set ctime explicitly unless other time
1584 stamps are changed explicitly (i.e. by utime()
1585 since we would then have a mix of client and
1586 server times */
1587
1588 if (set_time && (attrs->ia_valid & ATTR_CTIME)) {
1589 set_time = TRUE;
1590 /* Although Samba throws this field away
1591 it may be useful to Windows - but we do
1592 not want to set ctime unless some other
1593 timestamp is changing */
1594 cFYI(1, ("CIFS - CTIME changed"));
1595 time_buf.ChangeTime =
1596 cpu_to_le64(cifs_UnixTimeToNT(attrs->ia_ctime));
1597 } else
1598 time_buf.ChangeTime = 0;
1599
1600 if (set_time || set_dosattr) {
1601 time_buf.CreationTime = 0; /* do not change */
1602 /* In the future we should experiment - try setting timestamps
1603 via Handle (SetFileInfo) instead of by path */
1604 if (!(pTcon->ses->flags & CIFS_SES_NT4))
1605 rc = CIFSSMBSetTimes(xid, pTcon, full_path, &time_buf,
1606 cifs_sb->local_nls,
1607 cifs_sb->mnt_cifs_flags &
1608 CIFS_MOUNT_MAP_SPECIAL_CHR);
1609 else
1610 rc = -EOPNOTSUPP;
1611
1612 if (rc == -EOPNOTSUPP) {
1613 int oplock = FALSE;
1614 __u16 netfid;
1615
1616 cFYI(1, ("calling SetFileInfo since SetPathInfo for "
1617 "times not supported by this server"));
1618 /* BB we could scan to see if we already have it open
1619 and pass in pid of opener to function */
1620 rc = CIFSSMBOpen(xid, pTcon, full_path, FILE_OPEN,
1621 SYNCHRONIZE | FILE_WRITE_ATTRIBUTES,
1622 CREATE_NOT_DIR, &netfid, &oplock,
1623 NULL, cifs_sb->local_nls,
1624 cifs_sb->mnt_cifs_flags &
1625 CIFS_MOUNT_MAP_SPECIAL_CHR);
1626 if (rc == 0) {
1627 rc = CIFSSMBSetFileTimes(xid, pTcon, &time_buf,
1628 netfid);
1629 CIFSSMBClose(xid, pTcon, netfid);
1630 } else {
1631 /* BB For even older servers we could convert time_buf
1632 into old DOS style which uses two second
1633 granularity */
1634
1635 /* rc = CIFSSMBSetTimesLegacy(xid, pTcon, full_path,
1636 &time_buf, cifs_sb->local_nls); */
1637 }
1638 }
1639 /* Even if error on time set, no sense failing the call if
1640 the server would set the time to a reasonable value anyway,
1641 and this check ensures that we are not being called from
1642 sys_utimes in which case we ought to fail the call back to
1643 the user when the server rejects the call */
1644 if ((rc) && (attrs->ia_valid &
1645 (ATTR_MODE | ATTR_GID | ATTR_UID | ATTR_SIZE)))
1646 rc = 0;
1647 }
1648
1649 /* do not need local check to inode_check_ok since the server does
1650 that */
1651 if (!rc)
1652 rc = inode_setattr(direntry->d_inode, attrs);
1653 cifs_setattr_exit:
1654 kfree(full_path);
1655 FreeXid(xid);
1656 return rc;
1657 }
1658
1659 #if 0
1660 void cifs_delete_inode(struct inode *inode)
1661 {
1662 cFYI(1, ("In cifs_delete_inode, inode = 0x%p", inode));
1663 /* may have to add back in if and when safe distributed caching of
1664 directories added e.g. via FindNotify */
1665 }
1666 #endif
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