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ACPI: Make Len Brown the ACPI maintainer again
[linux-2.6/next.git] / fs / cifs / inode.c
blob848286861c314737961cc91f55f3e574930a17a7
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
33 static void cifs_set_ops(struct inode *inode, const bool is_dfs_referral)
34 {
35 struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
36
37 switch (inode->i_mode & S_IFMT) {
38 case S_IFREG:
39 inode->i_op = &cifs_file_inode_ops;
40 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DIRECT_IO) {
41 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_BRL)
42 inode->i_fop = &cifs_file_direct_nobrl_ops;
43 else
44 inode->i_fop = &cifs_file_direct_ops;
45 } else if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_BRL)
46 inode->i_fop = &cifs_file_nobrl_ops;
47 else { /* not direct, send byte range locks */
48 inode->i_fop = &cifs_file_ops;
49 }
50
51
52 /* check if server can support readpages */
53 if (cifs_sb->tcon->ses->server->maxBuf <
54 PAGE_CACHE_SIZE + MAX_CIFS_HDR_SIZE)
55 inode->i_data.a_ops = &cifs_addr_ops_smallbuf;
56 else
57 inode->i_data.a_ops = &cifs_addr_ops;
58 break;
59 case S_IFDIR:
60 #ifdef CONFIG_CIFS_DFS_UPCALL
61 if (is_dfs_referral) {
62 inode->i_op = &cifs_dfs_referral_inode_operations;
63 } else {
64 #else /* NO DFS support, treat as a directory */
65 {
66 #endif
67 inode->i_op = &cifs_dir_inode_ops;
68 inode->i_fop = &cifs_dir_ops;
69 }
70 break;
71 case S_IFLNK:
72 inode->i_op = &cifs_symlink_inode_ops;
73 break;
74 default:
75 init_special_inode(inode, inode->i_mode, inode->i_rdev);
76 break;
77 }
78 }
79
80 static void cifs_unix_info_to_inode(struct inode *inode,
81 FILE_UNIX_BASIC_INFO *info, int force_uid_gid)
82 {
83 struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
84 struct cifsInodeInfo *cifsInfo = CIFS_I(inode);
85 __u64 num_of_bytes = le64_to_cpu(info->NumOfBytes);
86 __u64 end_of_file = le64_to_cpu(info->EndOfFile);
87
88 inode->i_atime = cifs_NTtimeToUnix(le64_to_cpu(info->LastAccessTime));
89 inode->i_mtime =
90 cifs_NTtimeToUnix(le64_to_cpu(info->LastModificationTime));
91 inode->i_ctime = cifs_NTtimeToUnix(le64_to_cpu(info->LastStatusChange));
92 inode->i_mode = le64_to_cpu(info->Permissions);
93
94 /*
95 * Since we set the inode type below we need to mask off
96 * to avoid strange results if bits set above.
97 */
98 inode->i_mode &= ~S_IFMT;
99 switch (le32_to_cpu(info->Type)) {
100 case UNIX_FILE:
101 inode->i_mode |= S_IFREG;
102 break;
103 case UNIX_SYMLINK:
104 inode->i_mode |= S_IFLNK;
105 break;
106 case UNIX_DIR:
107 inode->i_mode |= S_IFDIR;
108 break;
109 case UNIX_CHARDEV:
110 inode->i_mode |= S_IFCHR;
111 inode->i_rdev = MKDEV(le64_to_cpu(info->DevMajor),
112 le64_to_cpu(info->DevMinor) & MINORMASK);
113 break;
114 case UNIX_BLOCKDEV:
115 inode->i_mode |= S_IFBLK;
116 inode->i_rdev = MKDEV(le64_to_cpu(info->DevMajor),
117 le64_to_cpu(info->DevMinor) & MINORMASK);
118 break;
119 case UNIX_FIFO:
120 inode->i_mode |= S_IFIFO;
121 break;
122 case UNIX_SOCKET:
123 inode->i_mode |= S_IFSOCK;
124 break;
125 default:
126 /* safest to call it a file if we do not know */
127 inode->i_mode |= S_IFREG;
128 cFYI(1, ("unknown type %d", le32_to_cpu(info->Type)));
129 break;
130 }
131
132 if ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_OVERR_UID) &&
133 !force_uid_gid)
134 inode->i_uid = cifs_sb->mnt_uid;
135 else
136 inode->i_uid = le64_to_cpu(info->Uid);
137
138 if ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_OVERR_GID) &&
139 !force_uid_gid)
140 inode->i_gid = cifs_sb->mnt_gid;
141 else
142 inode->i_gid = le64_to_cpu(info->Gid);
143
144 inode->i_nlink = le64_to_cpu(info->Nlinks);
145
146 spin_lock(&inode->i_lock);
147 if (is_size_safe_to_change(cifsInfo, end_of_file)) {
148 /*
149 * We can not safely change the file size here if the client
150 * is writing to it due to potential races.
151 */
152 i_size_write(inode, end_of_file);
153
154 /*
155 * i_blocks is not related to (i_size / i_blksize),
156 * but instead 512 byte (2**9) size is required for
157 * calculating num blocks.
158 */
159 inode->i_blocks = (512 - 1 + num_of_bytes) >> 9;
160 }
161 spin_unlock(&inode->i_lock);
162 }
163
164
165 /*
166 * Needed to setup inode data for the directory which is the
167 * junction to the new submount (ie to setup the fake directory
168 * which represents a DFS referral)
169 */
170 static void fill_fake_finddataunix(FILE_UNIX_BASIC_INFO *pfnd_dat,
171 struct super_block *sb)
172 {
173 struct inode *pinode = NULL;
174
175 memset(pfnd_dat, 0, sizeof(FILE_UNIX_BASIC_INFO));
176
177 /* __le64 pfnd_dat->EndOfFile = cpu_to_le64(0);
178 __le64 pfnd_dat->NumOfBytes = cpu_to_le64(0);
179 __u64 UniqueId = 0; */
180 pfnd_dat->LastStatusChange =
181 cpu_to_le64(cifs_UnixTimeToNT(CURRENT_TIME));
182 pfnd_dat->LastAccessTime =
183 cpu_to_le64(cifs_UnixTimeToNT(CURRENT_TIME));
184 pfnd_dat->LastModificationTime =
185 cpu_to_le64(cifs_UnixTimeToNT(CURRENT_TIME));
186 pfnd_dat->Type = cpu_to_le32(UNIX_DIR);
187 pfnd_dat->Permissions = cpu_to_le64(S_IXUGO | S_IRWXU);
188 pfnd_dat->Nlinks = cpu_to_le64(2);
189 if (sb->s_root)
190 pinode = sb->s_root->d_inode;
191 if (pinode == NULL)
192 return;
193
194 /* fill in default values for the remaining based on root
195 inode since we can not query the server for this inode info */
196 pfnd_dat->DevMajor = cpu_to_le64(MAJOR(pinode->i_rdev));
197 pfnd_dat->DevMinor = cpu_to_le64(MINOR(pinode->i_rdev));
198 pfnd_dat->Uid = cpu_to_le64(pinode->i_uid);
199 pfnd_dat->Gid = cpu_to_le64(pinode->i_gid);
200 }
201
202 int cifs_get_inode_info_unix(struct inode **pinode,
203 const unsigned char *full_path, struct super_block *sb, int xid)
204 {
205 int rc = 0;
206 FILE_UNIX_BASIC_INFO find_data;
207 struct cifsTconInfo *pTcon;
208 struct inode *inode;
209 struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
210 bool is_dfs_referral = false;
211 struct cifsInodeInfo *cifsInfo;
212 __u64 num_of_bytes;
213 __u64 end_of_file;
214
215 pTcon = cifs_sb->tcon;
216 cFYI(1, ("Getting info on %s", full_path));
217
218 /* could have done a find first instead but this returns more info */
219 rc = CIFSSMBUnixQPathInfo(xid, pTcon, full_path, &find_data,
220 cifs_sb->local_nls, cifs_sb->mnt_cifs_flags &
221 CIFS_MOUNT_MAP_SPECIAL_CHR);
222 if (rc == -EREMOTE && !is_dfs_referral) {
223 is_dfs_referral = true;
224 cFYI(DBG2, ("DFS ref"));
225 /* for DFS, server does not give us real inode data */
226 fill_fake_finddataunix(&find_data, sb);
227 rc = 0;
228 } else if (rc)
229 goto cgiiu_exit;
230
231 num_of_bytes = le64_to_cpu(find_data.NumOfBytes);
232 end_of_file = le64_to_cpu(find_data.EndOfFile);
233
234 /* get new inode */
235 if (*pinode == NULL) {
236 *pinode = new_inode(sb);
237 if (*pinode == NULL) {
238 rc = -ENOMEM;
239 goto cgiiu_exit;
240 }
241 /* Is an i_ino of zero legal? */
242 /* note ino incremented to unique num in new_inode */
243 /* Are there sanity checks we can use to ensure that
244 the server is really filling in that field? */
245 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM)
246 (*pinode)->i_ino = (unsigned long)find_data.UniqueId;
247
248 if (sb->s_flags & MS_NOATIME)
249 (*pinode)->i_flags |= S_NOATIME | S_NOCMTIME;
250
251 insert_inode_hash(*pinode);
252 }
253
254 inode = *pinode;
255 cifsInfo = CIFS_I(inode);
256
257 cFYI(1, ("Old time %ld", cifsInfo->time));
258 cifsInfo->time = jiffies;
259 cFYI(1, ("New time %ld", cifsInfo->time));
260 /* this is ok to set on every inode revalidate */
261 atomic_set(&cifsInfo->inUse, 1);
262
263 cifs_unix_info_to_inode(inode, &find_data, 0);
264
265 if (num_of_bytes < end_of_file)
266 cFYI(1, ("allocation size less than end of file"));
267 cFYI(1, ("Size %ld and blocks %llu",
268 (unsigned long) inode->i_size,
269 (unsigned long long)inode->i_blocks));
270
271 cifs_set_ops(inode, is_dfs_referral);
272 cgiiu_exit:
273 return rc;
274 }
275
276 static int decode_sfu_inode(struct inode *inode, __u64 size,
277 const unsigned char *path,
278 struct cifs_sb_info *cifs_sb, int xid)
279 {
280 int rc;
281 int oplock = 0;
282 __u16 netfid;
283 struct cifsTconInfo *pTcon = cifs_sb->tcon;
284 char buf[24];
285 unsigned int bytes_read;
286 char *pbuf;
287
288 pbuf = buf;
289
290 if (size == 0) {
291 inode->i_mode |= S_IFIFO;
292 return 0;
293 } else if (size < 8) {
294 return -EINVAL; /* EOPNOTSUPP? */
295 }
296
297 rc = CIFSSMBOpen(xid, pTcon, path, FILE_OPEN, GENERIC_READ,
298 CREATE_NOT_DIR, &netfid, &oplock, NULL,
299 cifs_sb->local_nls,
300 cifs_sb->mnt_cifs_flags &
301 CIFS_MOUNT_MAP_SPECIAL_CHR);
302 if (rc == 0) {
303 int buf_type = CIFS_NO_BUFFER;
304 /* Read header */
305 rc = CIFSSMBRead(xid, pTcon,
306 netfid,
307 24 /* length */, 0 /* offset */,
308 &bytes_read, &pbuf, &buf_type);
309 if ((rc == 0) && (bytes_read >= 8)) {
310 if (memcmp("IntxBLK", pbuf, 8) == 0) {
311 cFYI(1, ("Block device"));
312 inode->i_mode |= S_IFBLK;
313 if (bytes_read == 24) {
314 /* we have enough to decode dev num */
315 __u64 mjr; /* major */
316 __u64 mnr; /* minor */
317 mjr = le64_to_cpu(*(__le64 *)(pbuf+8));
318 mnr = le64_to_cpu(*(__le64 *)(pbuf+16));
319 inode->i_rdev = MKDEV(mjr, mnr);
320 }
321 } else if (memcmp("IntxCHR", pbuf, 8) == 0) {
322 cFYI(1, ("Char device"));
323 inode->i_mode |= S_IFCHR;
324 if (bytes_read == 24) {
325 /* we have enough to decode dev num */
326 __u64 mjr; /* major */
327 __u64 mnr; /* minor */
328 mjr = le64_to_cpu(*(__le64 *)(pbuf+8));
329 mnr = le64_to_cpu(*(__le64 *)(pbuf+16));
330 inode->i_rdev = MKDEV(mjr, mnr);
331 }
332 } else if (memcmp("IntxLNK", pbuf, 7) == 0) {
333 cFYI(1, ("Symlink"));
334 inode->i_mode |= S_IFLNK;
335 } else {
336 inode->i_mode |= S_IFREG; /* file? */
337 rc = -EOPNOTSUPP;
338 }
339 } else {
340 inode->i_mode |= S_IFREG; /* then it is a file */
341 rc = -EOPNOTSUPP; /* or some unknown SFU type */
342 }
343 CIFSSMBClose(xid, pTcon, netfid);
344 }
345 return rc;
346 }
347
348 #define SFBITS_MASK (S_ISVTX | S_ISGID | S_ISUID) /* SETFILEBITS valid bits */
349
350 static int get_sfu_mode(struct inode *inode,
351 const unsigned char *path,
352 struct cifs_sb_info *cifs_sb, int xid)
353 {
354 #ifdef CONFIG_CIFS_XATTR
355 ssize_t rc;
356 char ea_value[4];
357 __u32 mode;
358
359 rc = CIFSSMBQueryEA(xid, cifs_sb->tcon, path, "SETFILEBITS",
360 ea_value, 4 /* size of buf */, cifs_sb->local_nls,
361 cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR);
362 if (rc < 0)
363 return (int)rc;
364 else if (rc > 3) {
365 mode = le32_to_cpu(*((__le32 *)ea_value));
366 inode->i_mode &= ~SFBITS_MASK;
367 cFYI(1, ("special bits 0%o org mode 0%o", mode, inode->i_mode));
368 inode->i_mode = (mode & SFBITS_MASK) | inode->i_mode;
369 cFYI(1, ("special mode bits 0%o", mode));
370 return 0;
371 } else {
372 return 0;
373 }
374 #else
375 return -EOPNOTSUPP;
376 #endif
377 }
378
379 /*
380 * Needed to setup inode data for the directory which is the
381 * junction to the new submount (ie to setup the fake directory
382 * which represents a DFS referral)
383 */
384 static void fill_fake_finddata(FILE_ALL_INFO *pfnd_dat,
385 struct super_block *sb)
386 {
387 memset(pfnd_dat, 0, sizeof(FILE_ALL_INFO));
388
389 /* __le64 pfnd_dat->AllocationSize = cpu_to_le64(0);
390 __le64 pfnd_dat->EndOfFile = cpu_to_le64(0);
391 __u8 pfnd_dat->DeletePending = 0;
392 __u8 pfnd_data->Directory = 0;
393 __le32 pfnd_dat->EASize = 0;
394 __u64 pfnd_dat->IndexNumber = 0;
395 __u64 pfnd_dat->IndexNumber1 = 0; */
396 pfnd_dat->CreationTime =
397 cpu_to_le64(cifs_UnixTimeToNT(CURRENT_TIME));
398 pfnd_dat->LastAccessTime =
399 cpu_to_le64(cifs_UnixTimeToNT(CURRENT_TIME));
400 pfnd_dat->LastWriteTime =
401 cpu_to_le64(cifs_UnixTimeToNT(CURRENT_TIME));
402 pfnd_dat->ChangeTime =
403 cpu_to_le64(cifs_UnixTimeToNT(CURRENT_TIME));
404 pfnd_dat->Attributes = cpu_to_le32(ATTR_DIRECTORY);
405 pfnd_dat->NumberOfLinks = cpu_to_le32(2);
406 }
407
408 int cifs_get_inode_info(struct inode **pinode,
409 const unsigned char *full_path, FILE_ALL_INFO *pfindData,
410 struct super_block *sb, int xid, const __u16 *pfid)
411 {
412 int rc = 0;
413 __u32 attr;
414 struct cifsInodeInfo *cifsInfo;
415 struct cifsTconInfo *pTcon;
416 struct inode *inode;
417 struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
418 char *buf = NULL;
419 bool adjustTZ = false;
420 bool is_dfs_referral = false;
421 umode_t default_mode;
422
423 pTcon = cifs_sb->tcon;
424 cFYI(1, ("Getting info on %s", full_path));
425
426 if ((pfindData == NULL) && (*pinode != NULL)) {
427 if (CIFS_I(*pinode)->clientCanCacheRead) {
428 cFYI(1, ("No need to revalidate cached inode sizes"));
429 return rc;
430 }
431 }
432
433 /* if file info not passed in then get it from server */
434 if (pfindData == NULL) {
435 buf = kmalloc(sizeof(FILE_ALL_INFO), GFP_KERNEL);
436 if (buf == NULL)
437 return -ENOMEM;
438 pfindData = (FILE_ALL_INFO *)buf;
439
440 /* could do find first instead but this returns more info */
441 rc = CIFSSMBQPathInfo(xid, pTcon, full_path, pfindData,
442 0 /* not legacy */,
443 cifs_sb->local_nls, cifs_sb->mnt_cifs_flags &
444 CIFS_MOUNT_MAP_SPECIAL_CHR);
445 /* BB optimize code so we do not make the above call
446 when server claims no NT SMB support and the above call
447 failed at least once - set flag in tcon or mount */
448 if ((rc == -EOPNOTSUPP) || (rc == -EINVAL)) {
449 rc = SMBQueryInformation(xid, pTcon, full_path,
450 pfindData, cifs_sb->local_nls,
451 cifs_sb->mnt_cifs_flags &
452 CIFS_MOUNT_MAP_SPECIAL_CHR);
453 adjustTZ = true;
454 }
455 }
456 /* dump_mem("\nQPathInfo return data",&findData, sizeof(findData)); */
457 if (rc == -EREMOTE) {
458 is_dfs_referral = true;
459 fill_fake_finddata(pfindData, sb);
460 rc = 0;
461 } else if (rc)
462 goto cgii_exit;
463
464 attr = le32_to_cpu(pfindData->Attributes);
465
466 /* get new inode */
467 if (*pinode == NULL) {
468 *pinode = new_inode(sb);
469 if (*pinode == NULL) {
470 rc = -ENOMEM;
471 goto cgii_exit;
472 }
473 /* Is an i_ino of zero legal? Can we use that to check
474 if the server supports returning inode numbers? Are
475 there other sanity checks we can use to ensure that
476 the server is really filling in that field? */
477
478 /* We can not use the IndexNumber field by default from
479 Windows or Samba (in ALL_INFO buf) but we can request
480 it explicitly. It may not be unique presumably if
481 the server has multiple devices mounted under one share */
482
483 /* There may be higher info levels that work but are
484 there Windows server or network appliances for which
485 IndexNumber field is not guaranteed unique? */
486
487 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM) {
488 int rc1 = 0;
489 __u64 inode_num;
490
491 rc1 = CIFSGetSrvInodeNumber(xid, pTcon,
492 full_path, &inode_num,
493 cifs_sb->local_nls,
494 cifs_sb->mnt_cifs_flags &
495 CIFS_MOUNT_MAP_SPECIAL_CHR);
496 if (rc1) {
497 cFYI(1, ("GetSrvInodeNum rc %d", rc1));
498 /* BB EOPNOSUPP disable SERVER_INUM? */
499 } else /* do we need cast or hash to ino? */
500 (*pinode)->i_ino = inode_num;
501 } /* else ino incremented to unique num in new_inode*/
502 if (sb->s_flags & MS_NOATIME)
503 (*pinode)->i_flags |= S_NOATIME | S_NOCMTIME;
504 insert_inode_hash(*pinode);
505 }
506 inode = *pinode;
507 cifsInfo = CIFS_I(inode);
508 cifsInfo->cifsAttrs = attr;
509 cFYI(1, ("Old time %ld", cifsInfo->time));
510 cifsInfo->time = jiffies;
511 cFYI(1, ("New time %ld", cifsInfo->time));
512
513 /* blksize needs to be multiple of two. So safer to default to
514 blksize and blkbits set in superblock so 2**blkbits and blksize
515 will match rather than setting to:
516 (pTcon->ses->server->maxBuf - MAX_CIFS_HDR_SIZE) & 0xFFFFFE00;*/
517
518 /* Linux can not store file creation time so ignore it */
519 if (pfindData->LastAccessTime)
520 inode->i_atime = cifs_NTtimeToUnix
521 (le64_to_cpu(pfindData->LastAccessTime));
522 else /* do not need to use current_fs_time - time not stored */
523 inode->i_atime = CURRENT_TIME;
524 inode->i_mtime =
525 cifs_NTtimeToUnix(le64_to_cpu(pfindData->LastWriteTime));
526 inode->i_ctime =
527 cifs_NTtimeToUnix(le64_to_cpu(pfindData->ChangeTime));
528 cFYI(DBG2, ("Attributes came in as 0x%x", attr));
529 if (adjustTZ && (pTcon->ses) && (pTcon->ses->server)) {
530 inode->i_ctime.tv_sec += pTcon->ses->server->timeAdj;
531 inode->i_mtime.tv_sec += pTcon->ses->server->timeAdj;
532 }
533
534 /* get default inode mode */
535 if (attr & ATTR_DIRECTORY)
536 default_mode = cifs_sb->mnt_dir_mode;
537 else
538 default_mode = cifs_sb->mnt_file_mode;
539
540 /* set permission bits */
541 if (atomic_read(&cifsInfo->inUse) == 0 ||
542 (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DYNPERM) == 0)
543 inode->i_mode = default_mode;
544 else {
545 /* just reenable write bits if !ATTR_READONLY */
546 if ((inode->i_mode & S_IWUGO) == 0 &&
547 (attr & ATTR_READONLY) == 0)
548 inode->i_mode |= (S_IWUGO & default_mode);
549 inode->i_mode &= ~S_IFMT;
550 }
551 /* clear write bits if ATTR_READONLY is set */
552 if (attr & ATTR_READONLY)
553 inode->i_mode &= ~S_IWUGO;
554
555 /* set inode type */
556 if ((attr & ATTR_SYSTEM) &&
557 (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_UNX_EMUL)) {
558 /* no need to fix endianness on 0 */
559 if (pfindData->EndOfFile == 0)
560 inode->i_mode |= S_IFIFO;
561 else if (decode_sfu_inode(inode,
562 le64_to_cpu(pfindData->EndOfFile),
563 full_path, cifs_sb, xid))
564 cFYI(1, ("unknown SFU file type\n"));
565 } else {
566 if (attr & ATTR_DIRECTORY)
567 inode->i_mode |= S_IFDIR;
568 else
569 inode->i_mode |= S_IFREG;
570 }
571
572 spin_lock(&inode->i_lock);
573 if (is_size_safe_to_change(cifsInfo,
574 le64_to_cpu(pfindData->EndOfFile))) {
575 /* can not safely shrink the file size here if the
576 client is writing to it due to potential races */
577 i_size_write(inode, le64_to_cpu(pfindData->EndOfFile));
578
579 /* 512 bytes (2**9) is the fake blocksize that must be
580 used for this calculation */
581 inode->i_blocks = (512 - 1 + le64_to_cpu(
582 pfindData->AllocationSize)) >> 9;
583 }
584 spin_unlock(&inode->i_lock);
585
586 inode->i_nlink = le32_to_cpu(pfindData->NumberOfLinks);
587
588 /* BB fill in uid and gid here? with help from winbind?
589 or retrieve from NTFS stream extended attribute */
590 #ifdef CONFIG_CIFS_EXPERIMENTAL
591 /* fill in 0777 bits from ACL */
592 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_CIFS_ACL) {
593 cFYI(1, ("Getting mode bits from ACL"));
594 acl_to_uid_mode(inode, full_path, pfid);
595 }
596 #endif
597 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_UNX_EMUL) {
598 /* fill in remaining high mode bits e.g. SUID, VTX */
599 get_sfu_mode(inode, full_path, cifs_sb, xid);
600 } else if (atomic_read(&cifsInfo->inUse) == 0) {
601 inode->i_uid = cifs_sb->mnt_uid;
602 inode->i_gid = cifs_sb->mnt_gid;
603 /* set so we do not keep refreshing these fields with
604 bad data after user has changed them in memory */
605 atomic_set(&cifsInfo->inUse, 1);
606 }
607
608 cifs_set_ops(inode, is_dfs_referral);
609
610
611
612
613 cgii_exit:
614 kfree(buf);
615 return rc;
616 }
617
618 static const struct inode_operations cifs_ipc_inode_ops = {
619 .lookup = cifs_lookup,
620 };
621
622 /* gets root inode */
623 struct inode *cifs_iget(struct super_block *sb, unsigned long ino)
624 {
625 int xid;
626 struct cifs_sb_info *cifs_sb;
627 struct inode *inode;
628 long rc;
629
630 inode = iget_locked(sb, ino);
631 if (!inode)
632 return ERR_PTR(-ENOMEM);
633 if (!(inode->i_state & I_NEW))
634 return inode;
635
636 cifs_sb = CIFS_SB(inode->i_sb);
637 xid = GetXid();
638
639 if (cifs_sb->tcon->unix_ext)
640 rc = cifs_get_inode_info_unix(&inode, "", inode->i_sb, xid);
641 else
642 rc = cifs_get_inode_info(&inode, "", NULL, inode->i_sb, xid,
643 NULL);
644 if (rc && cifs_sb->tcon->ipc) {
645 cFYI(1, ("ipc connection - fake read inode"));
646 inode->i_mode |= S_IFDIR;
647 inode->i_nlink = 2;
648 inode->i_op = &cifs_ipc_inode_ops;
649 inode->i_fop = &simple_dir_operations;
650 inode->i_uid = cifs_sb->mnt_uid;
651 inode->i_gid = cifs_sb->mnt_gid;
652 } else if (rc) {
653 _FreeXid(xid);
654 iget_failed(inode);
655 return ERR_PTR(rc);
656 }
657
658 unlock_new_inode(inode);
659
660 /* can not call macro FreeXid here since in a void func
661 * TODO: This is no longer true
662 */
663 _FreeXid(xid);
664 return inode;
665 }
666
667 int cifs_unlink(struct inode *inode, struct dentry *direntry)
668 {
669 int rc = 0;
670 int xid;
671 struct cifs_sb_info *cifs_sb;
672 struct cifsTconInfo *pTcon;
673 char *full_path = NULL;
674 struct cifsInodeInfo *cifsInode;
675 FILE_BASIC_INFO *pinfo_buf;
676
677 cFYI(1, ("cifs_unlink, inode = 0x%p", inode));
678
679 xid = GetXid();
680
681 if (inode)
682 cifs_sb = CIFS_SB(inode->i_sb);
683 else
684 cifs_sb = CIFS_SB(direntry->d_sb);
685 pTcon = cifs_sb->tcon;
686
687 /* Unlink can be called from rename so we can not grab the sem here
688 since we deadlock otherwise */
689 /* mutex_lock(&direntry->d_sb->s_vfs_rename_mutex);*/
690 full_path = build_path_from_dentry(direntry);
691 /* mutex_unlock(&direntry->d_sb->s_vfs_rename_mutex);*/
692 if (full_path == NULL) {
693 FreeXid(xid);
694 return -ENOMEM;
695 }
696
697 if ((pTcon->ses->capabilities & CAP_UNIX) &&
698 (CIFS_UNIX_POSIX_PATH_OPS_CAP &
699 le64_to_cpu(pTcon->fsUnixInfo.Capability))) {
700 rc = CIFSPOSIXDelFile(xid, pTcon, full_path,
701 SMB_POSIX_UNLINK_FILE_TARGET, cifs_sb->local_nls,
702 cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR);
703 cFYI(1, ("posix del rc %d", rc));
704 if ((rc == 0) || (rc == -ENOENT))
705 goto psx_del_no_retry;
706 }
707
708 rc = CIFSSMBDelFile(xid, pTcon, full_path, cifs_sb->local_nls,
709 cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR);
710 psx_del_no_retry:
711 if (!rc) {
712 if (direntry->d_inode)
713 drop_nlink(direntry->d_inode);
714 } else if (rc == -ENOENT) {
715 d_drop(direntry);
716 } else if (rc == -ETXTBSY) {
717 int oplock = 0;
718 __u16 netfid;
719
720 rc = CIFSSMBOpen(xid, pTcon, full_path, FILE_OPEN, DELETE,
721 CREATE_NOT_DIR | CREATE_DELETE_ON_CLOSE,
722 &netfid, &oplock, NULL, cifs_sb->local_nls,
723 cifs_sb->mnt_cifs_flags &
724 CIFS_MOUNT_MAP_SPECIAL_CHR);
725 if (rc == 0) {
726 CIFSSMBRenameOpenFile(xid, pTcon, netfid, NULL,
727 cifs_sb->local_nls,
728 cifs_sb->mnt_cifs_flags &
729 CIFS_MOUNT_MAP_SPECIAL_CHR);
730 CIFSSMBClose(xid, pTcon, netfid);
731 if (direntry->d_inode)
732 drop_nlink(direntry->d_inode);
733 }
734 } else if (rc == -EACCES) {
735 /* try only if r/o attribute set in local lookup data? */
736 pinfo_buf = kzalloc(sizeof(FILE_BASIC_INFO), GFP_KERNEL);
737 if (pinfo_buf) {
738 /* ATTRS set to normal clears r/o bit */
739 pinfo_buf->Attributes = cpu_to_le32(ATTR_NORMAL);
740 if (!(pTcon->ses->flags & CIFS_SES_NT4))
741 rc = CIFSSMBSetPathInfo(xid, pTcon, full_path,
742 pinfo_buf,
743 cifs_sb->local_nls,
744 cifs_sb->mnt_cifs_flags &
745 CIFS_MOUNT_MAP_SPECIAL_CHR);
746 else
747 rc = -EOPNOTSUPP;
748
749 if (rc == -EOPNOTSUPP) {
750 int oplock = 0;
751 __u16 netfid;
752 /* rc = CIFSSMBSetAttrLegacy(xid, pTcon,
753 full_path,
754 (__u16)ATTR_NORMAL,
755 cifs_sb->local_nls);
756 For some strange reason it seems that NT4 eats the
757 old setattr call without actually setting the
758 attributes so on to the third attempted workaround
759 */
760
761 /* BB could scan to see if we already have it open
762 and pass in pid of opener to function */
763 rc = CIFSSMBOpen(xid, pTcon, full_path,
764 FILE_OPEN, SYNCHRONIZE |
765 FILE_WRITE_ATTRIBUTES, 0,
766 &netfid, &oplock, NULL,
767 cifs_sb->local_nls,
768 cifs_sb->mnt_cifs_flags &
769 CIFS_MOUNT_MAP_SPECIAL_CHR);
770 if (rc == 0) {
771 rc = CIFSSMBSetFileInfo(xid, pTcon,
772 pinfo_buf,
773 netfid,
774 current->tgid);
775 CIFSSMBClose(xid, pTcon, netfid);
776 }
777 }
778 kfree(pinfo_buf);
779 }
780 if (rc == 0) {
781 rc = CIFSSMBDelFile(xid, pTcon, full_path,
782 cifs_sb->local_nls,
783 cifs_sb->mnt_cifs_flags &
784 CIFS_MOUNT_MAP_SPECIAL_CHR);
785 if (!rc) {
786 if (direntry->d_inode)
787 drop_nlink(direntry->d_inode);
788 } else if (rc == -ETXTBSY) {
789 int oplock = 0;
790 __u16 netfid;
791
792 rc = CIFSSMBOpen(xid, pTcon, full_path,
793 FILE_OPEN, DELETE,
794 CREATE_NOT_DIR |
795 CREATE_DELETE_ON_CLOSE,
796 &netfid, &oplock, NULL,
797 cifs_sb->local_nls,
798 cifs_sb->mnt_cifs_flags &
799 CIFS_MOUNT_MAP_SPECIAL_CHR);
800 if (rc == 0) {
801 CIFSSMBRenameOpenFile(xid, pTcon,
802 netfid, NULL,
803 cifs_sb->local_nls,
804 cifs_sb->mnt_cifs_flags &
805 CIFS_MOUNT_MAP_SPECIAL_CHR);
806 CIFSSMBClose(xid, pTcon, netfid);
807 if (direntry->d_inode)
808 drop_nlink(direntry->d_inode);
809 }
810 /* BB if rc = -ETXTBUSY goto the rename logic BB */
811 }
812 }
813 }
814 if (direntry->d_inode) {
815 cifsInode = CIFS_I(direntry->d_inode);
816 cifsInode->time = 0; /* will force revalidate to get info
817 when needed */
818 direntry->d_inode->i_ctime = current_fs_time(inode->i_sb);
819 }
820 if (inode) {
821 inode->i_ctime = inode->i_mtime = current_fs_time(inode->i_sb);
822 cifsInode = CIFS_I(inode);
823 cifsInode->time = 0; /* force revalidate of dir as well */
824 }
825
826 kfree(full_path);
827 FreeXid(xid);
828 return rc;
829 }
830
831 static void posix_fill_in_inode(struct inode *tmp_inode,
832 FILE_UNIX_BASIC_INFO *pData, int isNewInode)
833 {
834 struct cifsInodeInfo *cifsInfo = CIFS_I(tmp_inode);
835 loff_t local_size;
836 struct timespec local_mtime;
837
838 cifsInfo->time = jiffies;
839 atomic_inc(&cifsInfo->inUse);
840
841 /* save mtime and size */
842 local_mtime = tmp_inode->i_mtime;
843 local_size = tmp_inode->i_size;
844
845 cifs_unix_info_to_inode(tmp_inode, pData, 1);
846 cifs_set_ops(tmp_inode, false);
847
848 if (!S_ISREG(tmp_inode->i_mode))
849 return;
850
851 /*
852 * No sense invalidating pages for new inode
853 * since we we have not started caching
854 * readahead file data yet.
855 */
856 if (isNewInode)
857 return;
858
859 if (timespec_equal(&tmp_inode->i_mtime, &local_mtime) &&
860 (local_size == tmp_inode->i_size)) {
861 cFYI(1, ("inode exists but unchanged"));
862 } else {
863 /* file may have changed on server */
864 cFYI(1, ("invalidate inode, readdir detected change"));
865 invalidate_remote_inode(tmp_inode);
866 }
867 }
868
869 int cifs_mkdir(struct inode *inode, struct dentry *direntry, int mode)
870 {
871 int rc = 0;
872 int xid;
873 struct cifs_sb_info *cifs_sb;
874 struct cifsTconInfo *pTcon;
875 char *full_path = NULL;
876 struct inode *newinode = NULL;
877
878 cFYI(1, ("In cifs_mkdir, mode = 0x%x inode = 0x%p", mode, inode));
879
880 xid = GetXid();
881
882 cifs_sb = CIFS_SB(inode->i_sb);
883 pTcon = cifs_sb->tcon;
884
885 full_path = build_path_from_dentry(direntry);
886 if (full_path == NULL) {
887 FreeXid(xid);
888 return -ENOMEM;
889 }
890
891 if ((pTcon->ses->capabilities & CAP_UNIX) &&
892 (CIFS_UNIX_POSIX_PATH_OPS_CAP &
893 le64_to_cpu(pTcon->fsUnixInfo.Capability))) {
894 u32 oplock = 0;
895 FILE_UNIX_BASIC_INFO *pInfo =
896 kzalloc(sizeof(FILE_UNIX_BASIC_INFO), GFP_KERNEL);
897 if (pInfo == NULL) {
898 rc = -ENOMEM;
899 goto mkdir_out;
900 }
901
902 mode &= ~current->fs->umask;
903 rc = CIFSPOSIXCreate(xid, pTcon, SMB_O_DIRECTORY | SMB_O_CREAT,
904 mode, NULL /* netfid */, pInfo, &oplock,
905 full_path, cifs_sb->local_nls,
906 cifs_sb->mnt_cifs_flags &
907 CIFS_MOUNT_MAP_SPECIAL_CHR);
908 if (rc == -EOPNOTSUPP) {
909 kfree(pInfo);
910 goto mkdir_retry_old;
911 } else if (rc) {
912 cFYI(1, ("posix mkdir returned 0x%x", rc));
913 d_drop(direntry);
914 } else {
915 if (pInfo->Type == cpu_to_le32(-1)) {
916 /* no return info, go query for it */
917 kfree(pInfo);
918 goto mkdir_get_info;
919 }
920 /*BB check (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SET_UID ) to see if need
921 to set uid/gid */
922 inc_nlink(inode);
923 if (pTcon->nocase)
924 direntry->d_op = &cifs_ci_dentry_ops;
925 else
926 direntry->d_op = &cifs_dentry_ops;
927
928 newinode = new_inode(inode->i_sb);
929 if (newinode == NULL) {
930 kfree(pInfo);
931 goto mkdir_get_info;
932 }
933 /* Is an i_ino of zero legal? */
934 /* Are there sanity checks we can use to ensure that
935 the server is really filling in that field? */
936 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM) {
937 newinode->i_ino =
938 (unsigned long)pInfo->UniqueId;
939 } /* note ino incremented to unique num in new_inode */
940 if (inode->i_sb->s_flags & MS_NOATIME)
941 newinode->i_flags |= S_NOATIME | S_NOCMTIME;
942 newinode->i_nlink = 2;
943
944 insert_inode_hash(newinode);
945 d_instantiate(direntry, newinode);
946
947 /* we already checked in POSIXCreate whether
948 frame was long enough */
949 posix_fill_in_inode(direntry->d_inode,
950 pInfo, 1 /* NewInode */);
951 #ifdef CONFIG_CIFS_DEBUG2
952 cFYI(1, ("instantiated dentry %p %s to inode %p",
953 direntry, direntry->d_name.name, newinode));
954
955 if (newinode->i_nlink != 2)
956 cFYI(1, ("unexpected number of links %d",
957 newinode->i_nlink));
958 #endif
959 }
960 kfree(pInfo);
961 goto mkdir_out;
962 }
963 mkdir_retry_old:
964 /* BB add setting the equivalent of mode via CreateX w/ACLs */
965 rc = CIFSSMBMkDir(xid, pTcon, full_path, cifs_sb->local_nls,
966 cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR);
967 if (rc) {
968 cFYI(1, ("cifs_mkdir returned 0x%x", rc));
969 d_drop(direntry);
970 } else {
971 mkdir_get_info:
972 inc_nlink(inode);
973 if (pTcon->unix_ext)
974 rc = cifs_get_inode_info_unix(&newinode, full_path,
975 inode->i_sb, xid);
976 else
977 rc = cifs_get_inode_info(&newinode, full_path, NULL,
978 inode->i_sb, xid, NULL);
979
980 if (pTcon->nocase)
981 direntry->d_op = &cifs_ci_dentry_ops;
982 else
983 direntry->d_op = &cifs_dentry_ops;
984 d_instantiate(direntry, newinode);
985 /* setting nlink not necessary except in cases where we
986 * failed to get it from the server or was set bogus */
987 if ((direntry->d_inode) && (direntry->d_inode->i_nlink < 2))
988 direntry->d_inode->i_nlink = 2;
989
990 mode &= ~current->fs->umask;
991 /* must turn on setgid bit if parent dir has it */
992 if (inode->i_mode & S_ISGID)
993 mode |= S_ISGID;
994
995 if (pTcon->unix_ext) {
996 struct cifs_unix_set_info_args args = {
997 .mode = mode,
998 .ctime = NO_CHANGE_64,
999 .atime = NO_CHANGE_64,
1000 .mtime = NO_CHANGE_64,
1001 .device = 0,
1002 };
1003 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SET_UID) {
1004 args.uid = (__u64)current->fsuid;
1005 if (inode->i_mode & S_ISGID)
1006 args.gid = (__u64)inode->i_gid;
1007 else
1008 args.gid = (__u64)current->fsgid;
1009 } else {
1010 args.uid = NO_CHANGE_64;
1011 args.gid = NO_CHANGE_64;
1012 }
1013 CIFSSMBUnixSetInfo(xid, pTcon, full_path, &args,
1014 cifs_sb->local_nls,
1015 cifs_sb->mnt_cifs_flags &
1016 CIFS_MOUNT_MAP_SPECIAL_CHR);
1017 } else {
1018 if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_CIFS_ACL) &&
1019 (mode & S_IWUGO) == 0) {
1020 FILE_BASIC_INFO pInfo;
1021 memset(&pInfo, 0, sizeof(pInfo));
1022 pInfo.Attributes = cpu_to_le32(ATTR_READONLY);
1023 CIFSSMBSetPathInfo(xid, pTcon, full_path,
1024 &pInfo, cifs_sb->local_nls,
1025 cifs_sb->mnt_cifs_flags &
1026 CIFS_MOUNT_MAP_SPECIAL_CHR);
1027 }
1028 if (direntry->d_inode) {
1029 if (cifs_sb->mnt_cifs_flags &
1030 CIFS_MOUNT_DYNPERM)
1031 direntry->d_inode->i_mode =
1032 (mode | S_IFDIR);
1033
1034 if (cifs_sb->mnt_cifs_flags &
1035 CIFS_MOUNT_SET_UID) {
1036 direntry->d_inode->i_uid =
1037 current->fsuid;
1038 if (inode->i_mode & S_ISGID)
1039 direntry->d_inode->i_gid =
1040 inode->i_gid;
1041 else
1042 direntry->d_inode->i_gid =
1043 current->fsgid;
1044 }
1045 }
1046 }
1047 }
1048 mkdir_out:
1049 kfree(full_path);
1050 FreeXid(xid);
1051 return rc;
1052 }
1053
1054 int cifs_rmdir(struct inode *inode, struct dentry *direntry)
1055 {
1056 int rc = 0;
1057 int xid;
1058 struct cifs_sb_info *cifs_sb;
1059 struct cifsTconInfo *pTcon;
1060 char *full_path = NULL;
1061 struct cifsInodeInfo *cifsInode;
1062
1063 cFYI(1, ("cifs_rmdir, inode = 0x%p", inode));
1064
1065 xid = GetXid();
1066
1067 cifs_sb = CIFS_SB(inode->i_sb);
1068 pTcon = cifs_sb->tcon;
1069
1070 full_path = build_path_from_dentry(direntry);
1071 if (full_path == NULL) {
1072 FreeXid(xid);
1073 return -ENOMEM;
1074 }
1075
1076 rc = CIFSSMBRmDir(xid, pTcon, full_path, cifs_sb->local_nls,
1077 cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR);
1078
1079 if (!rc) {
1080 drop_nlink(inode);
1081 spin_lock(&direntry->d_inode->i_lock);
1082 i_size_write(direntry->d_inode, 0);
1083 clear_nlink(direntry->d_inode);
1084 spin_unlock(&direntry->d_inode->i_lock);
1085 }
1086
1087 cifsInode = CIFS_I(direntry->d_inode);
1088 cifsInode->time = 0; /* force revalidate to go get info when
1089 needed */
1090 direntry->d_inode->i_ctime = inode->i_ctime = inode->i_mtime =
1091 current_fs_time(inode->i_sb);
1092
1093 kfree(full_path);
1094 FreeXid(xid);
1095 return rc;
1096 }
1097
1098 int cifs_rename(struct inode *source_inode, struct dentry *source_direntry,
1099 struct inode *target_inode, struct dentry *target_direntry)
1100 {
1101 char *fromName;
1102 char *toName;
1103 struct cifs_sb_info *cifs_sb_source;
1104 struct cifs_sb_info *cifs_sb_target;
1105 struct cifsTconInfo *pTcon;
1106 int xid;
1107 int rc = 0;
1108
1109 xid = GetXid();
1110
1111 cifs_sb_target = CIFS_SB(target_inode->i_sb);
1112 cifs_sb_source = CIFS_SB(source_inode->i_sb);
1113 pTcon = cifs_sb_source->tcon;
1114
1115 if (pTcon != cifs_sb_target->tcon) {
1116 FreeXid(xid);
1117 return -EXDEV; /* BB actually could be allowed if same server,
1118 but different share.
1119 Might eventually add support for this */
1120 }
1121
1122 /* we already have the rename sem so we do not need to grab it again
1123 here to protect the path integrity */
1124 fromName = build_path_from_dentry(source_direntry);
1125 toName = build_path_from_dentry(target_direntry);
1126 if ((fromName == NULL) || (toName == NULL)) {
1127 rc = -ENOMEM;
1128 goto cifs_rename_exit;
1129 }
1130
1131 rc = CIFSSMBRename(xid, pTcon, fromName, toName,
1132 cifs_sb_source->local_nls,
1133 cifs_sb_source->mnt_cifs_flags &
1134 CIFS_MOUNT_MAP_SPECIAL_CHR);
1135 if (rc == -EEXIST) {
1136 /* check if they are the same file because rename of hardlinked
1137 files is a noop */
1138 FILE_UNIX_BASIC_INFO *info_buf_source;
1139 FILE_UNIX_BASIC_INFO *info_buf_target;
1140
1141 info_buf_source =
1142 kmalloc(2 * sizeof(FILE_UNIX_BASIC_INFO), GFP_KERNEL);
1143 if (info_buf_source != NULL) {
1144 info_buf_target = info_buf_source + 1;
1145 if (pTcon->unix_ext)
1146 rc = CIFSSMBUnixQPathInfo(xid, pTcon, fromName,
1147 info_buf_source,
1148 cifs_sb_source->local_nls,
1149 cifs_sb_source->mnt_cifs_flags &
1150 CIFS_MOUNT_MAP_SPECIAL_CHR);
1151 /* else rc is still EEXIST so will fall through to
1152 unlink the target and retry rename */
1153 if (rc == 0) {
1154 rc = CIFSSMBUnixQPathInfo(xid, pTcon, toName,
1155 info_buf_target,
1156 cifs_sb_target->local_nls,
1157 /* remap based on source sb */
1158 cifs_sb_source->mnt_cifs_flags &
1159 CIFS_MOUNT_MAP_SPECIAL_CHR);
1160 }
1161 if ((rc == 0) &&
1162 (info_buf_source->UniqueId ==
1163 info_buf_target->UniqueId)) {
1164 /* do not rename since the files are hardlinked which
1165 is a noop */
1166 } else {
1167 /* we either can not tell the files are hardlinked
1168 (as with Windows servers) or files are not
1169 hardlinked so delete the target manually before
1170 renaming to follow POSIX rather than Windows
1171 semantics */
1172 cifs_unlink(target_inode, target_direntry);
1173 rc = CIFSSMBRename(xid, pTcon, fromName,
1174 toName,
1175 cifs_sb_source->local_nls,
1176 cifs_sb_source->mnt_cifs_flags
1177 & CIFS_MOUNT_MAP_SPECIAL_CHR);
1178 }
1179 kfree(info_buf_source);
1180 } /* if we can not get memory just leave rc as EEXIST */
1181 }
1182
1183 if (rc)
1184 cFYI(1, ("rename rc %d", rc));
1185
1186 if ((rc == -EIO) || (rc == -EEXIST)) {
1187 int oplock = 0;
1188 __u16 netfid;
1189
1190 /* BB FIXME Is Generic Read correct for rename? */
1191 /* if renaming directory - we should not say CREATE_NOT_DIR,
1192 need to test renaming open directory, also GENERIC_READ
1193 might not right be right access to request */
1194 rc = CIFSSMBOpen(xid, pTcon, fromName, FILE_OPEN, GENERIC_READ,
1195 CREATE_NOT_DIR, &netfid, &oplock, NULL,
1196 cifs_sb_source->local_nls,
1197 cifs_sb_source->mnt_cifs_flags &
1198 CIFS_MOUNT_MAP_SPECIAL_CHR);
1199 if (rc == 0) {
1200 rc = CIFSSMBRenameOpenFile(xid, pTcon, netfid, toName,
1201 cifs_sb_source->local_nls,
1202 cifs_sb_source->mnt_cifs_flags &
1203 CIFS_MOUNT_MAP_SPECIAL_CHR);
1204 CIFSSMBClose(xid, pTcon, netfid);
1205 }
1206 }
1207
1208 cifs_rename_exit:
1209 kfree(fromName);
1210 kfree(toName);
1211 FreeXid(xid);
1212 return rc;
1213 }
1214
1215 int cifs_revalidate(struct dentry *direntry)
1216 {
1217 int xid;
1218 int rc = 0, wbrc = 0;
1219 char *full_path;
1220 struct cifs_sb_info *cifs_sb;
1221 struct cifsInodeInfo *cifsInode;
1222 loff_t local_size;
1223 struct timespec local_mtime;
1224 bool invalidate_inode = false;
1225
1226 if (direntry->d_inode == NULL)
1227 return -ENOENT;
1228
1229 cifsInode = CIFS_I(direntry->d_inode);
1230
1231 if (cifsInode == NULL)
1232 return -ENOENT;
1233
1234 /* no sense revalidating inode info on file that no one can write */
1235 if (CIFS_I(direntry->d_inode)->clientCanCacheRead)
1236 return rc;
1237
1238 xid = GetXid();
1239
1240 cifs_sb = CIFS_SB(direntry->d_sb);
1241
1242 /* can not safely grab the rename sem here if rename calls revalidate
1243 since that would deadlock */
1244 full_path = build_path_from_dentry(direntry);
1245 if (full_path == NULL) {
1246 FreeXid(xid);
1247 return -ENOMEM;
1248 }
1249 cFYI(1, ("Revalidate: %s inode 0x%p count %d dentry: 0x%p d_time %ld "
1250 "jiffies %ld", full_path, direntry->d_inode,
1251 direntry->d_inode->i_count.counter, direntry,
1252 direntry->d_time, jiffies));
1253
1254 if (cifsInode->time == 0) {
1255 /* was set to zero previously to force revalidate */
1256 } else if (time_before(jiffies, cifsInode->time + HZ) &&
1257 lookupCacheEnabled) {
1258 if ((S_ISREG(direntry->d_inode->i_mode) == 0) ||
1259 (direntry->d_inode->i_nlink == 1)) {
1260 kfree(full_path);
1261 FreeXid(xid);
1262 return rc;
1263 } else {
1264 cFYI(1, ("Have to revalidate file due to hardlinks"));
1265 }
1266 }
1267
1268 /* save mtime and size */
1269 local_mtime = direntry->d_inode->i_mtime;
1270 local_size = direntry->d_inode->i_size;
1271
1272 if (cifs_sb->tcon->unix_ext) {
1273 rc = cifs_get_inode_info_unix(&direntry->d_inode, full_path,
1274 direntry->d_sb, xid);
1275 if (rc) {
1276 cFYI(1, ("error on getting revalidate info %d", rc));
1277 /* if (rc != -ENOENT)
1278 rc = 0; */ /* BB should we cache info on
1279 certain errors? */
1280 }
1281 } else {
1282 rc = cifs_get_inode_info(&direntry->d_inode, full_path, NULL,
1283 direntry->d_sb, xid, NULL);
1284 if (rc) {
1285 cFYI(1, ("error on getting revalidate info %d", rc));
1286 /* if (rc != -ENOENT)
1287 rc = 0; */ /* BB should we cache info on
1288 certain errors? */
1289 }
1290 }
1291 /* should we remap certain errors, access denied?, to zero */
1292
1293 /* if not oplocked, we invalidate inode pages if mtime or file size
1294 had changed on server */
1295
1296 if (timespec_equal(&local_mtime, &direntry->d_inode->i_mtime) &&
1297 (local_size == direntry->d_inode->i_size)) {
1298 cFYI(1, ("cifs_revalidate - inode unchanged"));
1299 } else {
1300 /* file may have changed on server */
1301 if (cifsInode->clientCanCacheRead) {
1302 /* no need to invalidate inode pages since we were the
1303 only ones who could have modified the file and the
1304 server copy is staler than ours */
1305 } else {
1306 invalidate_inode = true;
1307 }
1308 }
1309
1310 /* can not grab this sem since kernel filesys locking documentation
1311 indicates i_mutex may be taken by the kernel on lookup and rename
1312 which could deadlock if we grab the i_mutex here as well */
1313 /* mutex_lock(&direntry->d_inode->i_mutex);*/
1314 /* need to write out dirty pages here */
1315 if (direntry->d_inode->i_mapping) {
1316 /* do we need to lock inode until after invalidate completes
1317 below? */
1318 wbrc = filemap_fdatawrite(direntry->d_inode->i_mapping);
1319 if (wbrc)
1320 CIFS_I(direntry->d_inode)->write_behind_rc = wbrc;
1321 }
1322 if (invalidate_inode) {
1323 /* shrink_dcache not necessary now that cifs dentry ops
1324 are exported for negative dentries */
1325 /* if (S_ISDIR(direntry->d_inode->i_mode))
1326 shrink_dcache_parent(direntry); */
1327 if (S_ISREG(direntry->d_inode->i_mode)) {
1328 if (direntry->d_inode->i_mapping) {
1329 wbrc = filemap_fdatawait(direntry->d_inode->i_mapping);
1330 if (wbrc)
1331 CIFS_I(direntry->d_inode)->write_behind_rc = wbrc;
1332 }
1333 /* may eventually have to do this for open files too */
1334 if (list_empty(&(cifsInode->openFileList))) {
1335 /* changed on server - flush read ahead pages */
1336 cFYI(1, ("Invalidating read ahead data on "
1337 "closed file"));
1338 invalidate_remote_inode(direntry->d_inode);
1339 }
1340 }
1341 }
1342 /* mutex_unlock(&direntry->d_inode->i_mutex); */
1343
1344 kfree(full_path);
1345 FreeXid(xid);
1346 return rc;
1347 }
1348
1349 int cifs_getattr(struct vfsmount *mnt, struct dentry *dentry,
1350 struct kstat *stat)
1351 {
1352 int err = cifs_revalidate(dentry);
1353 if (!err) {
1354 generic_fillattr(dentry->d_inode, stat);
1355 stat->blksize = CIFS_MAX_MSGSIZE;
1356 }
1357 return err;
1358 }
1359
1360 static int cifs_truncate_page(struct address_space *mapping, loff_t from)
1361 {
1362 pgoff_t index = from >> PAGE_CACHE_SHIFT;
1363 unsigned offset = from & (PAGE_CACHE_SIZE - 1);
1364 struct page *page;
1365 int rc = 0;
1366
1367 page = grab_cache_page(mapping, index);
1368 if (!page)
1369 return -ENOMEM;
1370
1371 zero_user_segment(page, offset, PAGE_CACHE_SIZE);
1372 unlock_page(page);
1373 page_cache_release(page);
1374 return rc;
1375 }
1376
1377 static int cifs_vmtruncate(struct inode *inode, loff_t offset)
1378 {
1379 struct address_space *mapping = inode->i_mapping;
1380 unsigned long limit;
1381
1382 spin_lock(&inode->i_lock);
1383 if (inode->i_size < offset)
1384 goto do_expand;
1385 /*
1386 * truncation of in-use swapfiles is disallowed - it would cause
1387 * subsequent swapout to scribble on the now-freed blocks.
1388 */
1389 if (IS_SWAPFILE(inode)) {
1390 spin_unlock(&inode->i_lock);
1391 goto out_busy;
1392 }
1393 i_size_write(inode, offset);
1394 spin_unlock(&inode->i_lock);
1395 /*
1396 * unmap_mapping_range is called twice, first simply for efficiency
1397 * so that truncate_inode_pages does fewer single-page unmaps. However
1398 * after this first call, and before truncate_inode_pages finishes,
1399 * it is possible for private pages to be COWed, which remain after
1400 * truncate_inode_pages finishes, hence the second unmap_mapping_range
1401 * call must be made for correctness.
1402 */
1403 unmap_mapping_range(mapping, offset + PAGE_SIZE - 1, 0, 1);
1404 truncate_inode_pages(mapping, offset);
1405 unmap_mapping_range(mapping, offset + PAGE_SIZE - 1, 0, 1);
1406 goto out_truncate;
1407
1408 do_expand:
1409 limit = current->signal->rlim[RLIMIT_FSIZE].rlim_cur;
1410 if (limit != RLIM_INFINITY && offset > limit) {
1411 spin_unlock(&inode->i_lock);
1412 goto out_sig;
1413 }
1414 if (offset > inode->i_sb->s_maxbytes) {
1415 spin_unlock(&inode->i_lock);
1416 goto out_big;
1417 }
1418 i_size_write(inode, offset);
1419 spin_unlock(&inode->i_lock);
1420 out_truncate:
1421 if (inode->i_op && inode->i_op->truncate)
1422 inode->i_op->truncate(inode);
1423 return 0;
1424 out_sig:
1425 send_sig(SIGXFSZ, current, 0);
1426 out_big:
1427 return -EFBIG;
1428 out_busy:
1429 return -ETXTBSY;
1430 }
1431
1432 static int
1433 cifs_set_file_size(struct inode *inode, struct iattr *attrs,
1434 int xid, char *full_path)
1435 {
1436 int rc;
1437 struct cifsFileInfo *open_file;
1438 struct cifsInodeInfo *cifsInode = CIFS_I(inode);
1439 struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
1440 struct cifsTconInfo *pTcon = cifs_sb->tcon;
1441
1442 /*
1443 * To avoid spurious oplock breaks from server, in the case of
1444 * inodes that we already have open, avoid doing path based
1445 * setting of file size if we can do it by handle.
1446 * This keeps our caching token (oplock) and avoids timeouts
1447 * when the local oplock break takes longer to flush
1448 * writebehind data than the SMB timeout for the SetPathInfo
1449 * request would allow
1450 */
1451 open_file = find_writable_file(cifsInode);
1452 if (open_file) {
1453 __u16 nfid = open_file->netfid;
1454 __u32 npid = open_file->pid;
1455 rc = CIFSSMBSetFileSize(xid, pTcon, attrs->ia_size, nfid,
1456 npid, false);
1457 atomic_dec(&open_file->wrtPending);
1458 cFYI(1, ("SetFSize for attrs rc = %d", rc));
1459 if ((rc == -EINVAL) || (rc == -EOPNOTSUPP)) {
1460 unsigned int bytes_written;
1461 rc = CIFSSMBWrite(xid, pTcon, nfid, 0, attrs->ia_size,
1462 &bytes_written, NULL, NULL, 1);
1463 cFYI(1, ("Wrt seteof rc %d", rc));
1464 }
1465 } else
1466 rc = -EINVAL;
1467
1468 if (rc != 0) {
1469 /* Set file size by pathname rather than by handle
1470 either because no valid, writeable file handle for
1471 it was found or because there was an error setting
1472 it by handle */
1473 rc = CIFSSMBSetEOF(xid, pTcon, full_path, attrs->ia_size,
1474 false, cifs_sb->local_nls,
1475 cifs_sb->mnt_cifs_flags &
1476 CIFS_MOUNT_MAP_SPECIAL_CHR);
1477 cFYI(1, ("SetEOF by path (setattrs) rc = %d", rc));
1478 if ((rc == -EINVAL) || (rc == -EOPNOTSUPP)) {
1479 __u16 netfid;
1480 int oplock = 0;
1481
1482 rc = SMBLegacyOpen(xid, pTcon, full_path,
1483 FILE_OPEN, GENERIC_WRITE,
1484 CREATE_NOT_DIR, &netfid, &oplock, NULL,
1485 cifs_sb->local_nls,
1486 cifs_sb->mnt_cifs_flags &
1487 CIFS_MOUNT_MAP_SPECIAL_CHR);
1488 if (rc == 0) {
1489 unsigned int bytes_written;
1490 rc = CIFSSMBWrite(xid, pTcon, netfid, 0,
1491 attrs->ia_size,
1492 &bytes_written, NULL,
1493 NULL, 1);
1494 cFYI(1, ("wrt seteof rc %d", rc));
1495 CIFSSMBClose(xid, pTcon, netfid);
1496 }
1497 }
1498 }
1499
1500 if (rc == 0) {
1501 rc = cifs_vmtruncate(inode, attrs->ia_size);
1502 cifs_truncate_page(inode->i_mapping, inode->i_size);
1503 }
1504
1505 return rc;
1506 }
1507
1508 static int
1509 cifs_set_file_info(struct inode *inode, struct iattr *attrs, int xid,
1510 char *full_path, __u32 dosattr)
1511 {
1512 int rc;
1513 int oplock = 0;
1514 __u16 netfid;
1515 __u32 netpid;
1516 bool set_time = false;
1517 struct cifsFileInfo *open_file;
1518 struct cifsInodeInfo *cifsInode = CIFS_I(inode);
1519 struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
1520 struct cifsTconInfo *pTcon = cifs_sb->tcon;
1521 FILE_BASIC_INFO info_buf;
1522
1523 if (attrs->ia_valid & ATTR_ATIME) {
1524 set_time = true;
1525 info_buf.LastAccessTime =
1526 cpu_to_le64(cifs_UnixTimeToNT(attrs->ia_atime));
1527 } else
1528 info_buf.LastAccessTime = 0;
1529
1530 if (attrs->ia_valid & ATTR_MTIME) {
1531 set_time = true;
1532 info_buf.LastWriteTime =
1533 cpu_to_le64(cifs_UnixTimeToNT(attrs->ia_mtime));
1534 } else
1535 info_buf.LastWriteTime = 0;
1536
1537 /*
1538 * Samba throws this field away, but windows may actually use it.
1539 * Do not set ctime unless other time stamps are changed explicitly
1540 * (i.e. by utimes()) since we would then have a mix of client and
1541 * server times.
1542 */
1543 if (set_time && (attrs->ia_valid & ATTR_CTIME)) {
1544 cFYI(1, ("CIFS - CTIME changed"));
1545 info_buf.ChangeTime =
1546 cpu_to_le64(cifs_UnixTimeToNT(attrs->ia_ctime));
1547 } else
1548 info_buf.ChangeTime = 0;
1549
1550 info_buf.CreationTime = 0; /* don't change */
1551 info_buf.Attributes = cpu_to_le32(dosattr);
1552
1553 /*
1554 * If the file is already open for write, just use that fileid
1555 */
1556 open_file = find_writable_file(cifsInode);
1557 if (open_file) {
1558 netfid = open_file->netfid;
1559 netpid = open_file->pid;
1560 goto set_via_filehandle;
1561 }
1562
1563 /*
1564 * NT4 apparently returns success on this call, but it doesn't
1565 * really work.
1566 */
1567 if (!(pTcon->ses->flags & CIFS_SES_NT4)) {
1568 rc = CIFSSMBSetPathInfo(xid, pTcon, full_path,
1569 &info_buf, cifs_sb->local_nls,
1570 cifs_sb->mnt_cifs_flags &
1571 CIFS_MOUNT_MAP_SPECIAL_CHR);
1572 if (rc != -EOPNOTSUPP && rc != -EINVAL)
1573 goto out;
1574 }
1575
1576 cFYI(1, ("calling SetFileInfo since SetPathInfo for "
1577 "times not supported by this server"));
1578 rc = CIFSSMBOpen(xid, pTcon, full_path, FILE_OPEN,
1579 SYNCHRONIZE | FILE_WRITE_ATTRIBUTES,
1580 CREATE_NOT_DIR, &netfid, &oplock,
1581 NULL, cifs_sb->local_nls,
1582 cifs_sb->mnt_cifs_flags &
1583 CIFS_MOUNT_MAP_SPECIAL_CHR);
1584
1585 if (rc != 0) {
1586 if (rc == -EIO)
1587 rc = -EINVAL;
1588 goto out;
1589 }
1590
1591 netpid = current->tgid;
1592
1593 set_via_filehandle:
1594 rc = CIFSSMBSetFileInfo(xid, pTcon, &info_buf, netfid, netpid);
1595 if (open_file == NULL)
1596 CIFSSMBClose(xid, pTcon, netfid);
1597 else
1598 atomic_dec(&open_file->wrtPending);
1599 out:
1600 return rc;
1601 }
1602
1603 static int
1604 cifs_setattr_unix(struct dentry *direntry, struct iattr *attrs)
1605 {
1606 int rc;
1607 int xid;
1608 char *full_path = NULL;
1609 struct inode *inode = direntry->d_inode;
1610 struct cifsInodeInfo *cifsInode = CIFS_I(inode);
1611 struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
1612 struct cifsTconInfo *pTcon = cifs_sb->tcon;
1613 struct cifs_unix_set_info_args *args = NULL;
1614
1615 cFYI(1, ("setattr_unix on file %s attrs->ia_valid=0x%x",
1616 direntry->d_name.name, attrs->ia_valid));
1617
1618 xid = GetXid();
1619
1620 if ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_PERM) == 0) {
1621 /* check if we have permission to change attrs */
1622 rc = inode_change_ok(inode, attrs);
1623 if (rc < 0)
1624 goto out;
1625 else
1626 rc = 0;
1627 }
1628
1629 full_path = build_path_from_dentry(direntry);
1630 if (full_path == NULL) {
1631 rc = -ENOMEM;
1632 goto out;
1633 }
1634
1635 if ((attrs->ia_valid & ATTR_MTIME) || (attrs->ia_valid & ATTR_SIZE)) {
1636 /*
1637 Flush data before changing file size or changing the last
1638 write time of the file on the server. If the
1639 flush returns error, store it to report later and continue.
1640 BB: This should be smarter. Why bother flushing pages that
1641 will be truncated anyway? Also, should we error out here if
1642 the flush returns error?
1643 */
1644 rc = filemap_write_and_wait(inode->i_mapping);
1645 if (rc != 0) {
1646 cifsInode->write_behind_rc = rc;
1647 rc = 0;
1648 }
1649 }
1650
1651 if (attrs->ia_valid & ATTR_SIZE) {
1652 rc = cifs_set_file_size(inode, attrs, xid, full_path);
1653 if (rc != 0)
1654 goto out;
1655 }
1656
1657 /* skip mode change if it's just for clearing setuid/setgid */
1658 if (attrs->ia_valid & (ATTR_KILL_SUID|ATTR_KILL_SGID))
1659 attrs->ia_valid &= ~ATTR_MODE;
1660
1661 args = kmalloc(sizeof(*args), GFP_KERNEL);
1662 if (args == NULL) {
1663 rc = -ENOMEM;
1664 goto out;
1665 }
1666
1667 /* set up the struct */
1668 if (attrs->ia_valid & ATTR_MODE)
1669 args->mode = attrs->ia_mode;
1670 else
1671 args->mode = NO_CHANGE_64;
1672
1673 if (attrs->ia_valid & ATTR_UID)
1674 args->uid = attrs->ia_uid;
1675 else
1676 args->uid = NO_CHANGE_64;
1677
1678 if (attrs->ia_valid & ATTR_GID)
1679 args->gid = attrs->ia_gid;
1680 else
1681 args->gid = NO_CHANGE_64;
1682
1683 if (attrs->ia_valid & ATTR_ATIME)
1684 args->atime = cifs_UnixTimeToNT(attrs->ia_atime);
1685 else
1686 args->atime = NO_CHANGE_64;
1687
1688 if (attrs->ia_valid & ATTR_MTIME)
1689 args->mtime = cifs_UnixTimeToNT(attrs->ia_mtime);
1690 else
1691 args->mtime = NO_CHANGE_64;
1692
1693 if (attrs->ia_valid & ATTR_CTIME)
1694 args->ctime = cifs_UnixTimeToNT(attrs->ia_ctime);
1695 else
1696 args->ctime = NO_CHANGE_64;
1697
1698 args->device = 0;
1699 rc = CIFSSMBUnixSetInfo(xid, pTcon, full_path, args,
1700 cifs_sb->local_nls,
1701 cifs_sb->mnt_cifs_flags &
1702 CIFS_MOUNT_MAP_SPECIAL_CHR);
1703
1704 if (!rc)
1705 rc = inode_setattr(inode, attrs);
1706 out:
1707 kfree(args);
1708 kfree(full_path);
1709 FreeXid(xid);
1710 return rc;
1711 }
1712
1713 static int
1714 cifs_setattr_nounix(struct dentry *direntry, struct iattr *attrs)
1715 {
1716 int xid;
1717 struct inode *inode = direntry->d_inode;
1718 struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
1719 struct cifsInodeInfo *cifsInode = CIFS_I(inode);
1720 char *full_path = NULL;
1721 int rc = -EACCES;
1722 __u32 dosattr = 0;
1723 __u64 mode = NO_CHANGE_64;
1724
1725 xid = GetXid();
1726
1727 cFYI(1, ("setattr on file %s attrs->iavalid 0x%x",
1728 direntry->d_name.name, attrs->ia_valid));
1729
1730 if ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_PERM) == 0) {
1731 /* check if we have permission to change attrs */
1732 rc = inode_change_ok(inode, attrs);
1733 if (rc < 0) {
1734 FreeXid(xid);
1735 return rc;
1736 } else
1737 rc = 0;
1738 }
1739
1740 full_path = build_path_from_dentry(direntry);
1741 if (full_path == NULL) {
1742 FreeXid(xid);
1743 return -ENOMEM;
1744 }
1745
1746 if ((attrs->ia_valid & ATTR_MTIME) || (attrs->ia_valid & ATTR_SIZE)) {
1747 /*
1748 Flush data before changing file size or changing the last
1749 write time of the file on the server. If the
1750 flush returns error, store it to report later and continue.
1751 BB: This should be smarter. Why bother flushing pages that
1752 will be truncated anyway? Also, should we error out here if
1753 the flush returns error?
1754 */
1755 rc = filemap_write_and_wait(inode->i_mapping);
1756 if (rc != 0) {
1757 cifsInode->write_behind_rc = rc;
1758 rc = 0;
1759 }
1760 }
1761
1762 if (attrs->ia_valid & ATTR_SIZE) {
1763 rc = cifs_set_file_size(inode, attrs, xid, full_path);
1764 if (rc != 0)
1765 goto cifs_setattr_exit;
1766 }
1767
1768 /*
1769 * Without unix extensions we can't send ownership changes to the
1770 * server, so silently ignore them. This is consistent with how
1771 * local DOS/Windows filesystems behave (VFAT, NTFS, etc). With
1772 * CIFSACL support + proper Windows to Unix idmapping, we may be
1773 * able to support this in the future.
1774 */
1775 if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SET_UID))
1776 attrs->ia_valid &= ~(ATTR_UID | ATTR_GID);
1777
1778 /* skip mode change if it's just for clearing setuid/setgid */
1779 if (attrs->ia_valid & (ATTR_KILL_SUID|ATTR_KILL_SGID))
1780 attrs->ia_valid &= ~ATTR_MODE;
1781
1782 if (attrs->ia_valid & ATTR_MODE) {
1783 cFYI(1, ("Mode changed to 0%o", attrs->ia_mode));
1784 mode = attrs->ia_mode;
1785 }
1786
1787 if (attrs->ia_valid & ATTR_MODE) {
1788 rc = 0;
1789 #ifdef CONFIG_CIFS_EXPERIMENTAL
1790 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_CIFS_ACL)
1791 rc = mode_to_acl(inode, full_path, mode);
1792 else
1793 #endif
1794 if (((mode & S_IWUGO) == 0) &&
1795 (cifsInode->cifsAttrs & ATTR_READONLY) == 0) {
1796
1797 dosattr = cifsInode->cifsAttrs | ATTR_READONLY;
1798
1799 /* fix up mode if we're not using dynperm */
1800 if ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DYNPERM) == 0)
1801 attrs->ia_mode = inode->i_mode & ~S_IWUGO;
1802 } else if ((mode & S_IWUGO) &&
1803 (cifsInode->cifsAttrs & ATTR_READONLY)) {
1804
1805 dosattr = cifsInode->cifsAttrs & ~ATTR_READONLY;
1806 /* Attributes of 0 are ignored */
1807 if (dosattr == 0)
1808 dosattr |= ATTR_NORMAL;
1809
1810 /* reset local inode permissions to normal */
1811 if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DYNPERM)) {
1812 attrs->ia_mode &= ~(S_IALLUGO);
1813 if (S_ISDIR(inode->i_mode))
1814 attrs->ia_mode |=
1815 cifs_sb->mnt_dir_mode;
1816 else
1817 attrs->ia_mode |=
1818 cifs_sb->mnt_file_mode;
1819 }
1820 } else if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DYNPERM)) {
1821 /* ignore mode change - ATTR_READONLY hasn't changed */
1822 attrs->ia_valid &= ~ATTR_MODE;
1823 }
1824 }
1825
1826 if (attrs->ia_valid & (ATTR_MTIME|ATTR_ATIME|ATTR_CTIME) ||
1827 ((attrs->ia_valid & ATTR_MODE) && dosattr)) {
1828 rc = cifs_set_file_info(inode, attrs, xid, full_path, dosattr);
1829 /* BB: check for rc = -EOPNOTSUPP and switch to legacy mode */
1830
1831 /* Even if error on time set, no sense failing the call if
1832 the server would set the time to a reasonable value anyway,
1833 and this check ensures that we are not being called from
1834 sys_utimes in which case we ought to fail the call back to
1835 the user when the server rejects the call */
1836 if ((rc) && (attrs->ia_valid &
1837 (ATTR_MODE | ATTR_GID | ATTR_UID | ATTR_SIZE)))
1838 rc = 0;
1839 }
1840
1841 /* do not need local check to inode_check_ok since the server does
1842 that */
1843 if (!rc)
1844 rc = inode_setattr(inode, attrs);
1845 cifs_setattr_exit:
1846 kfree(full_path);
1847 FreeXid(xid);
1848 return rc;
1849 }
1850
1851 int
1852 cifs_setattr(struct dentry *direntry, struct iattr *attrs)
1853 {
1854 struct inode *inode = direntry->d_inode;
1855 struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
1856 struct cifsTconInfo *pTcon = cifs_sb->tcon;
1857
1858 if (pTcon->unix_ext)
1859 return cifs_setattr_unix(direntry, attrs);
1860
1861 return cifs_setattr_nounix(direntry, attrs);
1862
1863 /* BB: add cifs_setattr_legacy for really old servers */
1864 }
1865
1866 #if 0
1867 void cifs_delete_inode(struct inode *inode)
1868 {
1869 cFYI(1, ("In cifs_delete_inode, inode = 0x%p", inode));
1870 /* may have to add back in if and when safe distributed caching of
1871 directories added e.g. via FindNotify */
1872 }
1873 #endif
linux-next