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Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-2.6
[deliverable/linux.git] / fs / cifs / inode.c
1 /*
2 * fs/cifs/inode.c
3 *
4 * Copyright (C) International Business Machines Corp., 2002,2007
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 cifsInfo->delete_pending = pfindData->DeletePending ? true : false;
510 cFYI(1, ("Old time %ld", cifsInfo->time));
511 cifsInfo->time = jiffies;
512 cFYI(1, ("New time %ld", cifsInfo->time));
513
514 /* blksize needs to be multiple of two. So safer to default to
515 blksize and blkbits set in superblock so 2**blkbits and blksize
516 will match rather than setting to:
517 (pTcon->ses->server->maxBuf - MAX_CIFS_HDR_SIZE) & 0xFFFFFE00;*/
518
519 /* Linux can not store file creation time so ignore it */
520 if (pfindData->LastAccessTime)
521 inode->i_atime = cifs_NTtimeToUnix
522 (le64_to_cpu(pfindData->LastAccessTime));
523 else /* do not need to use current_fs_time - time not stored */
524 inode->i_atime = CURRENT_TIME;
525 inode->i_mtime =
526 cifs_NTtimeToUnix(le64_to_cpu(pfindData->LastWriteTime));
527 inode->i_ctime =
528 cifs_NTtimeToUnix(le64_to_cpu(pfindData->ChangeTime));
529 cFYI(DBG2, ("Attributes came in as 0x%x", attr));
530 if (adjustTZ && (pTcon->ses) && (pTcon->ses->server)) {
531 inode->i_ctime.tv_sec += pTcon->ses->server->timeAdj;
532 inode->i_mtime.tv_sec += pTcon->ses->server->timeAdj;
533 }
534
535 /* get default inode mode */
536 if (attr & ATTR_DIRECTORY)
537 default_mode = cifs_sb->mnt_dir_mode;
538 else
539 default_mode = cifs_sb->mnt_file_mode;
540
541 /* set permission bits */
542 if (atomic_read(&cifsInfo->inUse) == 0 ||
543 (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DYNPERM) == 0)
544 inode->i_mode = default_mode;
545 else {
546 /* just reenable write bits if !ATTR_READONLY */
547 if ((inode->i_mode & S_IWUGO) == 0 &&
548 (attr & ATTR_READONLY) == 0)
549 inode->i_mode |= (S_IWUGO & default_mode);
550
551 inode->i_mode &= ~S_IFMT;
552 }
553 /* clear write bits if ATTR_READONLY is set */
554 if (attr & ATTR_READONLY)
555 inode->i_mode &= ~S_IWUGO;
556
557 /* set inode type */
558 if ((attr & ATTR_SYSTEM) &&
559 (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_UNX_EMUL)) {
560 /* no need to fix endianness on 0 */
561 if (pfindData->EndOfFile == 0)
562 inode->i_mode |= S_IFIFO;
563 else if (decode_sfu_inode(inode,
564 le64_to_cpu(pfindData->EndOfFile),
565 full_path, cifs_sb, xid))
566 cFYI(1, ("unknown SFU file type\n"));
567 } else {
568 if (attr & ATTR_DIRECTORY)
569 inode->i_mode |= S_IFDIR;
570 else
571 inode->i_mode |= S_IFREG;
572 }
573
574 spin_lock(&inode->i_lock);
575 if (is_size_safe_to_change(cifsInfo,
576 le64_to_cpu(pfindData->EndOfFile))) {
577 /* can not safely shrink the file size here if the
578 client is writing to it due to potential races */
579 i_size_write(inode, le64_to_cpu(pfindData->EndOfFile));
580
581 /* 512 bytes (2**9) is the fake blocksize that must be
582 used for this calculation */
583 inode->i_blocks = (512 - 1 + le64_to_cpu(
584 pfindData->AllocationSize)) >> 9;
585 }
586 spin_unlock(&inode->i_lock);
587
588 inode->i_nlink = le32_to_cpu(pfindData->NumberOfLinks);
589
590 /* BB fill in uid and gid here? with help from winbind?
591 or retrieve from NTFS stream extended attribute */
592 #ifdef CONFIG_CIFS_EXPERIMENTAL
593 /* fill in 0777 bits from ACL */
594 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_CIFS_ACL) {
595 cFYI(1, ("Getting mode bits from ACL"));
596 acl_to_uid_mode(inode, full_path, pfid);
597 }
598 #endif
599 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_UNX_EMUL) {
600 /* fill in remaining high mode bits e.g. SUID, VTX */
601 get_sfu_mode(inode, full_path, cifs_sb, xid);
602 } else if (atomic_read(&cifsInfo->inUse) == 0) {
603 inode->i_uid = cifs_sb->mnt_uid;
604 inode->i_gid = cifs_sb->mnt_gid;
605 /* set so we do not keep refreshing these fields with
606 bad data after user has changed them in memory */
607 atomic_set(&cifsInfo->inUse, 1);
608 }
609
610 cifs_set_ops(inode, is_dfs_referral);
611
612
613
614
615 cgii_exit:
616 kfree(buf);
617 return rc;
618 }
619
620 static const struct inode_operations cifs_ipc_inode_ops = {
621 .lookup = cifs_lookup,
622 };
623
624 /* gets root inode */
625 struct inode *cifs_iget(struct super_block *sb, unsigned long ino)
626 {
627 int xid;
628 struct cifs_sb_info *cifs_sb;
629 struct inode *inode;
630 long rc;
631
632 inode = iget_locked(sb, ino);
633 if (!inode)
634 return ERR_PTR(-ENOMEM);
635 if (!(inode->i_state & I_NEW))
636 return inode;
637
638 cifs_sb = CIFS_SB(inode->i_sb);
639 xid = GetXid();
640
641 if (cifs_sb->tcon->unix_ext)
642 rc = cifs_get_inode_info_unix(&inode, "", inode->i_sb, xid);
643 else
644 rc = cifs_get_inode_info(&inode, "", NULL, inode->i_sb, xid,
645 NULL);
646 if (rc && cifs_sb->tcon->ipc) {
647 cFYI(1, ("ipc connection - fake read inode"));
648 inode->i_mode |= S_IFDIR;
649 inode->i_nlink = 2;
650 inode->i_op = &cifs_ipc_inode_ops;
651 inode->i_fop = &simple_dir_operations;
652 inode->i_uid = cifs_sb->mnt_uid;
653 inode->i_gid = cifs_sb->mnt_gid;
654 } else if (rc) {
655 _FreeXid(xid);
656 iget_failed(inode);
657 return ERR_PTR(rc);
658 }
659
660 unlock_new_inode(inode);
661
662 /* can not call macro FreeXid here since in a void func
663 * TODO: This is no longer true
664 */
665 _FreeXid(xid);
666 return inode;
667 }
668
669 static int
670 cifs_set_file_info(struct inode *inode, struct iattr *attrs, int xid,
671 char *full_path, __u32 dosattr)
672 {
673 int rc;
674 int oplock = 0;
675 __u16 netfid;
676 __u32 netpid;
677 bool set_time = false;
678 struct cifsFileInfo *open_file;
679 struct cifsInodeInfo *cifsInode = CIFS_I(inode);
680 struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
681 struct cifsTconInfo *pTcon = cifs_sb->tcon;
682 FILE_BASIC_INFO info_buf;
683
684 if (attrs->ia_valid & ATTR_ATIME) {
685 set_time = true;
686 info_buf.LastAccessTime =
687 cpu_to_le64(cifs_UnixTimeToNT(attrs->ia_atime));
688 } else
689 info_buf.LastAccessTime = 0;
690
691 if (attrs->ia_valid & ATTR_MTIME) {
692 set_time = true;
693 info_buf.LastWriteTime =
694 cpu_to_le64(cifs_UnixTimeToNT(attrs->ia_mtime));
695 } else
696 info_buf.LastWriteTime = 0;
697
698 /*
699 * Samba throws this field away, but windows may actually use it.
700 * Do not set ctime unless other time stamps are changed explicitly
701 * (i.e. by utimes()) since we would then have a mix of client and
702 * server times.
703 */
704 if (set_time && (attrs->ia_valid & ATTR_CTIME)) {
705 cFYI(1, ("CIFS - CTIME changed"));
706 info_buf.ChangeTime =
707 cpu_to_le64(cifs_UnixTimeToNT(attrs->ia_ctime));
708 } else
709 info_buf.ChangeTime = 0;
710
711 info_buf.CreationTime = 0; /* don't change */
712 info_buf.Attributes = cpu_to_le32(dosattr);
713
714 /*
715 * If the file is already open for write, just use that fileid
716 */
717 open_file = find_writable_file(cifsInode);
718 if (open_file) {
719 netfid = open_file->netfid;
720 netpid = open_file->pid;
721 goto set_via_filehandle;
722 }
723
724 /*
725 * NT4 apparently returns success on this call, but it doesn't
726 * really work.
727 */
728 if (!(pTcon->ses->flags & CIFS_SES_NT4)) {
729 rc = CIFSSMBSetPathInfo(xid, pTcon, full_path,
730 &info_buf, cifs_sb->local_nls,
731 cifs_sb->mnt_cifs_flags &
732 CIFS_MOUNT_MAP_SPECIAL_CHR);
733 if (rc == 0) {
734 cifsInode->cifsAttrs = dosattr;
735 goto out;
736 } else if (rc != -EOPNOTSUPP && rc != -EINVAL)
737 goto out;
738 }
739
740 cFYI(1, ("calling SetFileInfo since SetPathInfo for "
741 "times not supported by this server"));
742 rc = CIFSSMBOpen(xid, pTcon, full_path, FILE_OPEN,
743 SYNCHRONIZE | FILE_WRITE_ATTRIBUTES,
744 CREATE_NOT_DIR, &netfid, &oplock,
745 NULL, cifs_sb->local_nls,
746 cifs_sb->mnt_cifs_flags &
747 CIFS_MOUNT_MAP_SPECIAL_CHR);
748
749 if (rc != 0) {
750 if (rc == -EIO)
751 rc = -EINVAL;
752 goto out;
753 }
754
755 netpid = current->tgid;
756
757 set_via_filehandle:
758 rc = CIFSSMBSetFileInfo(xid, pTcon, &info_buf, netfid, netpid);
759 if (!rc)
760 cifsInode->cifsAttrs = dosattr;
761
762 if (open_file == NULL)
763 CIFSSMBClose(xid, pTcon, netfid);
764 else
765 atomic_dec(&open_file->wrtPending);
766 out:
767 return rc;
768 }
769
770 /*
771 * open the given file (if it isn't already), set the DELETE_ON_CLOSE bit
772 * and rename it to a random name that hopefully won't conflict with
773 * anything else.
774 */
775 static int
776 cifs_rename_pending_delete(char *full_path, struct dentry *dentry, int xid)
777 {
778 int oplock = 0;
779 int rc;
780 __u16 netfid;
781 struct inode *inode = dentry->d_inode;
782 struct cifsInodeInfo *cifsInode = CIFS_I(inode);
783 struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
784 struct cifsTconInfo *tcon = cifs_sb->tcon;
785 __u32 dosattr, origattr;
786 FILE_BASIC_INFO *info_buf = NULL;
787
788 rc = CIFSSMBOpen(xid, tcon, full_path, FILE_OPEN,
789 DELETE|FILE_WRITE_ATTRIBUTES, CREATE_NOT_DIR,
790 &netfid, &oplock, NULL, cifs_sb->local_nls,
791 cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR);
792 if (rc != 0)
793 goto out;
794
795 origattr = cifsInode->cifsAttrs;
796 if (origattr == 0)
797 origattr |= ATTR_NORMAL;
798
799 dosattr = origattr & ~ATTR_READONLY;
800 if (dosattr == 0)
801 dosattr |= ATTR_NORMAL;
802 dosattr |= ATTR_HIDDEN;
803
804 /* set ATTR_HIDDEN and clear ATTR_READONLY, but only if needed */
805 if (dosattr != origattr) {
806 info_buf = kzalloc(sizeof(*info_buf), GFP_KERNEL);
807 if (info_buf == NULL) {
808 rc = -ENOMEM;
809 goto out_close;
810 }
811 info_buf->Attributes = cpu_to_le32(dosattr);
812 rc = CIFSSMBSetFileInfo(xid, tcon, info_buf, netfid,
813 current->tgid);
814 /* although we would like to mark the file hidden
815 if that fails we will still try to rename it */
816 if (rc != 0)
817 cifsInode->cifsAttrs = dosattr;
818 else
819 dosattr = origattr; /* since not able to change them */
820 }
821
822 /* rename the file */
823 rc = CIFSSMBRenameOpenFile(xid, tcon, netfid, NULL, cifs_sb->local_nls,
824 cifs_sb->mnt_cifs_flags &
825 CIFS_MOUNT_MAP_SPECIAL_CHR);
826 if (rc != 0) {
827 rc = -ETXTBSY;
828 goto undo_setattr;
829 }
830
831 /* try to set DELETE_ON_CLOSE */
832 if (!cifsInode->delete_pending) {
833 rc = CIFSSMBSetFileDisposition(xid, tcon, true, netfid,
834 current->tgid);
835 /*
836 * some samba versions return -ENOENT when we try to set the
837 * file disposition here. Likely a samba bug, but work around
838 * it for now. This means that some cifsXXX files may hang
839 * around after they shouldn't.
840 *
841 * BB: remove this hack after more servers have the fix
842 */
843 if (rc == -ENOENT)
844 rc = 0;
845 else if (rc != 0) {
846 rc = -ETXTBSY;
847 goto undo_rename;
848 }
849 cifsInode->delete_pending = true;
850 }
851
852 out_close:
853 CIFSSMBClose(xid, tcon, netfid);
854 out:
855 kfree(info_buf);
856 return rc;
857
858 /*
859 * reset everything back to the original state. Don't bother
860 * dealing with errors here since we can't do anything about
861 * them anyway.
862 */
863 undo_rename:
864 CIFSSMBRenameOpenFile(xid, tcon, netfid, dentry->d_name.name,
865 cifs_sb->local_nls, cifs_sb->mnt_cifs_flags &
866 CIFS_MOUNT_MAP_SPECIAL_CHR);
867 undo_setattr:
868 if (dosattr != origattr) {
869 info_buf->Attributes = cpu_to_le32(origattr);
870 if (!CIFSSMBSetFileInfo(xid, tcon, info_buf, netfid,
871 current->tgid))
872 cifsInode->cifsAttrs = origattr;
873 }
874
875 goto out_close;
876 }
877
878 int cifs_unlink(struct inode *dir, struct dentry *dentry)
879 {
880 int rc = 0;
881 int xid;
882 char *full_path = NULL;
883 struct inode *inode = dentry->d_inode;
884 struct cifsInodeInfo *cifsInode = CIFS_I(inode);
885 struct super_block *sb = dir->i_sb;
886 struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
887 struct cifsTconInfo *tcon = cifs_sb->tcon;
888 struct iattr *attrs = NULL;
889 __u32 dosattr = 0, origattr = 0;
890
891 cFYI(1, ("cifs_unlink, dir=0x%p, dentry=0x%p", dir, dentry));
892
893 xid = GetXid();
894
895 /* Unlink can be called from rename so we can not take the
896 * sb->s_vfs_rename_mutex here */
897 full_path = build_path_from_dentry(dentry);
898 if (full_path == NULL) {
899 FreeXid(xid);
900 return -ENOMEM;
901 }
902
903 if ((tcon->ses->capabilities & CAP_UNIX) &&
904 (CIFS_UNIX_POSIX_PATH_OPS_CAP &
905 le64_to_cpu(tcon->fsUnixInfo.Capability))) {
906 rc = CIFSPOSIXDelFile(xid, tcon, full_path,
907 SMB_POSIX_UNLINK_FILE_TARGET, cifs_sb->local_nls,
908 cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR);
909 cFYI(1, ("posix del rc %d", rc));
910 if ((rc == 0) || (rc == -ENOENT))
911 goto psx_del_no_retry;
912 }
913
914 retry_std_delete:
915 rc = CIFSSMBDelFile(xid, tcon, full_path, cifs_sb->local_nls,
916 cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR);
917
918 psx_del_no_retry:
919 if (!rc) {
920 if (inode)
921 drop_nlink(inode);
922 } else if (rc == -ENOENT) {
923 d_drop(dentry);
924 } else if (rc == -ETXTBSY) {
925 rc = cifs_rename_pending_delete(full_path, dentry, xid);
926 if (rc == 0)
927 drop_nlink(inode);
928 } else if (rc == -EACCES && dosattr == 0) {
929 attrs = kzalloc(sizeof(*attrs), GFP_KERNEL);
930 if (attrs == NULL) {
931 rc = -ENOMEM;
932 goto out_reval;
933 }
934
935 /* try to reset dos attributes */
936 origattr = cifsInode->cifsAttrs;
937 if (origattr == 0)
938 origattr |= ATTR_NORMAL;
939 dosattr = origattr & ~ATTR_READONLY;
940 if (dosattr == 0)
941 dosattr |= ATTR_NORMAL;
942 dosattr |= ATTR_HIDDEN;
943
944 rc = cifs_set_file_info(inode, attrs, xid, full_path, dosattr);
945 if (rc != 0)
946 goto out_reval;
947
948 goto retry_std_delete;
949 }
950
951 /* undo the setattr if we errored out and it's needed */
952 if (rc != 0 && dosattr != 0)
953 cifs_set_file_info(inode, attrs, xid, full_path, origattr);
954
955 out_reval:
956 if (inode) {
957 cifsInode = CIFS_I(inode);
958 cifsInode->time = 0; /* will force revalidate to get info
959 when needed */
960 inode->i_ctime = current_fs_time(sb);
961 }
962 dir->i_ctime = dir->i_mtime = current_fs_time(sb);
963 cifsInode = CIFS_I(dir);
964 CIFS_I(dir)->time = 0; /* force revalidate of dir as well */
965
966 kfree(full_path);
967 kfree(attrs);
968 FreeXid(xid);
969 return rc;
970 }
971
972 static void posix_fill_in_inode(struct inode *tmp_inode,
973 FILE_UNIX_BASIC_INFO *pData, int isNewInode)
974 {
975 struct cifsInodeInfo *cifsInfo = CIFS_I(tmp_inode);
976 loff_t local_size;
977 struct timespec local_mtime;
978
979 cifsInfo->time = jiffies;
980 atomic_inc(&cifsInfo->inUse);
981
982 /* save mtime and size */
983 local_mtime = tmp_inode->i_mtime;
984 local_size = tmp_inode->i_size;
985
986 cifs_unix_info_to_inode(tmp_inode, pData, 1);
987 cifs_set_ops(tmp_inode, false);
988
989 if (!S_ISREG(tmp_inode->i_mode))
990 return;
991
992 /*
993 * No sense invalidating pages for new inode
994 * since we we have not started caching
995 * readahead file data yet.
996 */
997 if (isNewInode)
998 return;
999
1000 if (timespec_equal(&tmp_inode->i_mtime, &local_mtime) &&
1001 (local_size == tmp_inode->i_size)) {
1002 cFYI(1, ("inode exists but unchanged"));
1003 } else {
1004 /* file may have changed on server */
1005 cFYI(1, ("invalidate inode, readdir detected change"));
1006 invalidate_remote_inode(tmp_inode);
1007 }
1008 }
1009
1010 int cifs_mkdir(struct inode *inode, struct dentry *direntry, int mode)
1011 {
1012 int rc = 0, tmprc;
1013 int xid;
1014 struct cifs_sb_info *cifs_sb;
1015 struct cifsTconInfo *pTcon;
1016 char *full_path = NULL;
1017 struct inode *newinode = NULL;
1018
1019 cFYI(1, ("In cifs_mkdir, mode = 0x%x inode = 0x%p", mode, inode));
1020
1021 xid = GetXid();
1022
1023 cifs_sb = CIFS_SB(inode->i_sb);
1024 pTcon = cifs_sb->tcon;
1025
1026 full_path = build_path_from_dentry(direntry);
1027 if (full_path == NULL) {
1028 FreeXid(xid);
1029 return -ENOMEM;
1030 }
1031
1032 if ((pTcon->ses->capabilities & CAP_UNIX) &&
1033 (CIFS_UNIX_POSIX_PATH_OPS_CAP &
1034 le64_to_cpu(pTcon->fsUnixInfo.Capability))) {
1035 u32 oplock = 0;
1036 FILE_UNIX_BASIC_INFO *pInfo =
1037 kzalloc(sizeof(FILE_UNIX_BASIC_INFO), GFP_KERNEL);
1038 if (pInfo == NULL) {
1039 rc = -ENOMEM;
1040 goto mkdir_out;
1041 }
1042
1043 mode &= ~current->fs->umask;
1044 rc = CIFSPOSIXCreate(xid, pTcon, SMB_O_DIRECTORY | SMB_O_CREAT,
1045 mode, NULL /* netfid */, pInfo, &oplock,
1046 full_path, cifs_sb->local_nls,
1047 cifs_sb->mnt_cifs_flags &
1048 CIFS_MOUNT_MAP_SPECIAL_CHR);
1049 if (rc == -EOPNOTSUPP) {
1050 kfree(pInfo);
1051 goto mkdir_retry_old;
1052 } else if (rc) {
1053 cFYI(1, ("posix mkdir returned 0x%x", rc));
1054 d_drop(direntry);
1055 } else {
1056 if (pInfo->Type == cpu_to_le32(-1)) {
1057 /* no return info, go query for it */
1058 kfree(pInfo);
1059 goto mkdir_get_info;
1060 }
1061 /*BB check (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SET_UID ) to see if need
1062 to set uid/gid */
1063 inc_nlink(inode);
1064 if (pTcon->nocase)
1065 direntry->d_op = &cifs_ci_dentry_ops;
1066 else
1067 direntry->d_op = &cifs_dentry_ops;
1068
1069 newinode = new_inode(inode->i_sb);
1070 if (newinode == NULL) {
1071 kfree(pInfo);
1072 goto mkdir_get_info;
1073 }
1074
1075 /* Is an i_ino of zero legal? */
1076 /* Are there sanity checks we can use to ensure that
1077 the server is really filling in that field? */
1078 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM) {
1079 newinode->i_ino =
1080 (unsigned long)pInfo->UniqueId;
1081 } /* note ino incremented to unique num in new_inode */
1082 if (inode->i_sb->s_flags & MS_NOATIME)
1083 newinode->i_flags |= S_NOATIME | S_NOCMTIME;
1084 newinode->i_nlink = 2;
1085
1086 insert_inode_hash(newinode);
1087 d_instantiate(direntry, newinode);
1088
1089 /* we already checked in POSIXCreate whether
1090 frame was long enough */
1091 posix_fill_in_inode(direntry->d_inode,
1092 pInfo, 1 /* NewInode */);
1093 #ifdef CONFIG_CIFS_DEBUG2
1094 cFYI(1, ("instantiated dentry %p %s to inode %p",
1095 direntry, direntry->d_name.name, newinode));
1096
1097 if (newinode->i_nlink != 2)
1098 cFYI(1, ("unexpected number of links %d",
1099 newinode->i_nlink));
1100 #endif
1101 }
1102 kfree(pInfo);
1103 goto mkdir_out;
1104 }
1105 mkdir_retry_old:
1106 /* BB add setting the equivalent of mode via CreateX w/ACLs */
1107 rc = CIFSSMBMkDir(xid, pTcon, full_path, cifs_sb->local_nls,
1108 cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR);
1109 if (rc) {
1110 cFYI(1, ("cifs_mkdir returned 0x%x", rc));
1111 d_drop(direntry);
1112 } else {
1113 mkdir_get_info:
1114 inc_nlink(inode);
1115 if (pTcon->unix_ext)
1116 rc = cifs_get_inode_info_unix(&newinode, full_path,
1117 inode->i_sb, xid);
1118 else
1119 rc = cifs_get_inode_info(&newinode, full_path, NULL,
1120 inode->i_sb, xid, NULL);
1121
1122 if (pTcon->nocase)
1123 direntry->d_op = &cifs_ci_dentry_ops;
1124 else
1125 direntry->d_op = &cifs_dentry_ops;
1126 d_instantiate(direntry, newinode);
1127 /* setting nlink not necessary except in cases where we
1128 * failed to get it from the server or was set bogus */
1129 if ((direntry->d_inode) && (direntry->d_inode->i_nlink < 2))
1130 direntry->d_inode->i_nlink = 2;
1131
1132 mode &= ~current->fs->umask;
1133 /* must turn on setgid bit if parent dir has it */
1134 if (inode->i_mode & S_ISGID)
1135 mode |= S_ISGID;
1136
1137 if (pTcon->unix_ext) {
1138 struct cifs_unix_set_info_args args = {
1139 .mode = mode,
1140 .ctime = NO_CHANGE_64,
1141 .atime = NO_CHANGE_64,
1142 .mtime = NO_CHANGE_64,
1143 .device = 0,
1144 };
1145 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SET_UID) {
1146 args.uid = (__u64)current->fsuid;
1147 if (inode->i_mode & S_ISGID)
1148 args.gid = (__u64)inode->i_gid;
1149 else
1150 args.gid = (__u64)current->fsgid;
1151 } else {
1152 args.uid = NO_CHANGE_64;
1153 args.gid = NO_CHANGE_64;
1154 }
1155 CIFSSMBUnixSetInfo(xid, pTcon, full_path, &args,
1156 cifs_sb->local_nls,
1157 cifs_sb->mnt_cifs_flags &
1158 CIFS_MOUNT_MAP_SPECIAL_CHR);
1159 } else {
1160 if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_CIFS_ACL) &&
1161 (mode & S_IWUGO) == 0) {
1162 FILE_BASIC_INFO pInfo;
1163 struct cifsInodeInfo *cifsInode;
1164 u32 dosattrs;
1165
1166 memset(&pInfo, 0, sizeof(pInfo));
1167 cifsInode = CIFS_I(newinode);
1168 dosattrs = cifsInode->cifsAttrs|ATTR_READONLY;
1169 pInfo.Attributes = cpu_to_le32(dosattrs);
1170 tmprc = CIFSSMBSetPathInfo(xid, pTcon,
1171 full_path, &pInfo,
1172 cifs_sb->local_nls,
1173 cifs_sb->mnt_cifs_flags &
1174 CIFS_MOUNT_MAP_SPECIAL_CHR);
1175 if (tmprc == 0)
1176 cifsInode->cifsAttrs = dosattrs;
1177 }
1178 if (direntry->d_inode) {
1179 if (cifs_sb->mnt_cifs_flags &
1180 CIFS_MOUNT_DYNPERM)
1181 direntry->d_inode->i_mode =
1182 (mode | S_IFDIR);
1183
1184 if (cifs_sb->mnt_cifs_flags &
1185 CIFS_MOUNT_SET_UID) {
1186 direntry->d_inode->i_uid =
1187 current->fsuid;
1188 if (inode->i_mode & S_ISGID)
1189 direntry->d_inode->i_gid =
1190 inode->i_gid;
1191 else
1192 direntry->d_inode->i_gid =
1193 current->fsgid;
1194 }
1195 }
1196 }
1197 }
1198 mkdir_out:
1199 kfree(full_path);
1200 FreeXid(xid);
1201 return rc;
1202 }
1203
1204 int cifs_rmdir(struct inode *inode, struct dentry *direntry)
1205 {
1206 int rc = 0;
1207 int xid;
1208 struct cifs_sb_info *cifs_sb;
1209 struct cifsTconInfo *pTcon;
1210 char *full_path = NULL;
1211 struct cifsInodeInfo *cifsInode;
1212
1213 cFYI(1, ("cifs_rmdir, inode = 0x%p", inode));
1214
1215 xid = GetXid();
1216
1217 cifs_sb = CIFS_SB(inode->i_sb);
1218 pTcon = cifs_sb->tcon;
1219
1220 full_path = build_path_from_dentry(direntry);
1221 if (full_path == NULL) {
1222 FreeXid(xid);
1223 return -ENOMEM;
1224 }
1225
1226 rc = CIFSSMBRmDir(xid, pTcon, full_path, cifs_sb->local_nls,
1227 cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR);
1228
1229 if (!rc) {
1230 drop_nlink(inode);
1231 spin_lock(&direntry->d_inode->i_lock);
1232 i_size_write(direntry->d_inode, 0);
1233 clear_nlink(direntry->d_inode);
1234 spin_unlock(&direntry->d_inode->i_lock);
1235 }
1236
1237 cifsInode = CIFS_I(direntry->d_inode);
1238 cifsInode->time = 0; /* force revalidate to go get info when
1239 needed */
1240 direntry->d_inode->i_ctime = inode->i_ctime = inode->i_mtime =
1241 current_fs_time(inode->i_sb);
1242
1243 kfree(full_path);
1244 FreeXid(xid);
1245 return rc;
1246 }
1247
1248 static int
1249 cifs_do_rename(int xid, struct dentry *from_dentry, const char *fromPath,
1250 struct dentry *to_dentry, const char *toPath)
1251 {
1252 struct cifs_sb_info *cifs_sb = CIFS_SB(from_dentry->d_sb);
1253 struct cifsTconInfo *pTcon = cifs_sb->tcon;
1254 __u16 srcfid;
1255 int oplock, rc;
1256
1257 /* try path-based rename first */
1258 rc = CIFSSMBRename(xid, pTcon, fromPath, toPath, cifs_sb->local_nls,
1259 cifs_sb->mnt_cifs_flags &
1260 CIFS_MOUNT_MAP_SPECIAL_CHR);
1261
1262 /*
1263 * don't bother with rename by filehandle unless file is busy and
1264 * source Note that cross directory moves do not work with
1265 * rename by filehandle to various Windows servers.
1266 */
1267 if (rc == 0 || rc != -ETXTBSY)
1268 return rc;
1269
1270 /* open the file to be renamed -- we need DELETE perms */
1271 rc = CIFSSMBOpen(xid, pTcon, fromPath, FILE_OPEN, DELETE,
1272 CREATE_NOT_DIR, &srcfid, &oplock, NULL,
1273 cifs_sb->local_nls, cifs_sb->mnt_cifs_flags &
1274 CIFS_MOUNT_MAP_SPECIAL_CHR);
1275
1276 if (rc == 0) {
1277 rc = CIFSSMBRenameOpenFile(xid, pTcon, srcfid,
1278 (const char *) to_dentry->d_name.name,
1279 cifs_sb->local_nls, cifs_sb->mnt_cifs_flags &
1280 CIFS_MOUNT_MAP_SPECIAL_CHR);
1281
1282 CIFSSMBClose(xid, pTcon, srcfid);
1283 }
1284
1285 return rc;
1286 }
1287
1288 int cifs_rename(struct inode *source_dir, struct dentry *source_dentry,
1289 struct inode *target_dir, struct dentry *target_dentry)
1290 {
1291 char *fromName = NULL;
1292 char *toName = NULL;
1293 struct cifs_sb_info *cifs_sb_source;
1294 struct cifs_sb_info *cifs_sb_target;
1295 struct cifsTconInfo *tcon;
1296 FILE_UNIX_BASIC_INFO *info_buf_source = NULL;
1297 FILE_UNIX_BASIC_INFO *info_buf_target;
1298 int xid, rc, tmprc;
1299
1300 cifs_sb_target = CIFS_SB(target_dir->i_sb);
1301 cifs_sb_source = CIFS_SB(source_dir->i_sb);
1302 tcon = cifs_sb_source->tcon;
1303
1304 xid = GetXid();
1305
1306 /*
1307 * BB: this might be allowed if same server, but different share.
1308 * Consider adding support for this
1309 */
1310 if (tcon != cifs_sb_target->tcon) {
1311 rc = -EXDEV;
1312 goto cifs_rename_exit;
1313 }
1314
1315 /*
1316 * we already have the rename sem so we do not need to
1317 * grab it again here to protect the path integrity
1318 */
1319 fromName = build_path_from_dentry(source_dentry);
1320 if (fromName == NULL) {
1321 rc = -ENOMEM;
1322 goto cifs_rename_exit;
1323 }
1324
1325 toName = build_path_from_dentry(target_dentry);
1326 if (toName == NULL) {
1327 rc = -ENOMEM;
1328 goto cifs_rename_exit;
1329 }
1330
1331 rc = cifs_do_rename(xid, source_dentry, fromName,
1332 target_dentry, toName);
1333
1334 if (rc == -EEXIST && tcon->unix_ext) {
1335 /*
1336 * Are src and dst hardlinks of same inode? We can
1337 * only tell with unix extensions enabled
1338 */
1339 info_buf_source =
1340 kmalloc(2 * sizeof(FILE_UNIX_BASIC_INFO),
1341 GFP_KERNEL);
1342 if (info_buf_source == NULL) {
1343 rc = -ENOMEM;
1344 goto cifs_rename_exit;
1345 }
1346
1347 info_buf_target = info_buf_source + 1;
1348 tmprc = CIFSSMBUnixQPathInfo(xid, tcon, fromName,
1349 info_buf_source,
1350 cifs_sb_source->local_nls,
1351 cifs_sb_source->mnt_cifs_flags &
1352 CIFS_MOUNT_MAP_SPECIAL_CHR);
1353 if (tmprc != 0)
1354 goto unlink_target;
1355
1356 tmprc = CIFSSMBUnixQPathInfo(xid, tcon,
1357 toName, info_buf_target,
1358 cifs_sb_target->local_nls,
1359 /* remap based on source sb */
1360 cifs_sb_source->mnt_cifs_flags &
1361 CIFS_MOUNT_MAP_SPECIAL_CHR);
1362
1363 if (tmprc == 0 && (info_buf_source->UniqueId ==
1364 info_buf_target->UniqueId))
1365 /* same file, POSIX says that this is a noop */
1366 goto cifs_rename_exit;
1367 } /* else ... BB we could add the same check for Windows by
1368 checking the UniqueId via FILE_INTERNAL_INFO */
1369
1370 unlink_target:
1371 if ((rc == -EACCES) || (rc == -EEXIST)) {
1372 tmprc = cifs_unlink(target_dir, target_dentry);
1373 if (tmprc)
1374 goto cifs_rename_exit;
1375
1376 rc = cifs_do_rename(xid, source_dentry, fromName,
1377 target_dentry, toName);
1378 }
1379
1380 cifs_rename_exit:
1381 kfree(info_buf_source);
1382 kfree(fromName);
1383 kfree(toName);
1384 FreeXid(xid);
1385 return rc;
1386 }
1387
1388 int cifs_revalidate(struct dentry *direntry)
1389 {
1390 int xid;
1391 int rc = 0, wbrc = 0;
1392 char *full_path;
1393 struct cifs_sb_info *cifs_sb;
1394 struct cifsInodeInfo *cifsInode;
1395 loff_t local_size;
1396 struct timespec local_mtime;
1397 bool invalidate_inode = false;
1398
1399 if (direntry->d_inode == NULL)
1400 return -ENOENT;
1401
1402 cifsInode = CIFS_I(direntry->d_inode);
1403
1404 if (cifsInode == NULL)
1405 return -ENOENT;
1406
1407 /* no sense revalidating inode info on file that no one can write */
1408 if (CIFS_I(direntry->d_inode)->clientCanCacheRead)
1409 return rc;
1410
1411 xid = GetXid();
1412
1413 cifs_sb = CIFS_SB(direntry->d_sb);
1414
1415 /* can not safely grab the rename sem here if rename calls revalidate
1416 since that would deadlock */
1417 full_path = build_path_from_dentry(direntry);
1418 if (full_path == NULL) {
1419 FreeXid(xid);
1420 return -ENOMEM;
1421 }
1422 cFYI(1, ("Revalidate: %s inode 0x%p count %d dentry: 0x%p d_time %ld "
1423 "jiffies %ld", full_path, direntry->d_inode,
1424 direntry->d_inode->i_count.counter, direntry,
1425 direntry->d_time, jiffies));
1426
1427 if (cifsInode->time == 0) {
1428 /* was set to zero previously to force revalidate */
1429 } else if (time_before(jiffies, cifsInode->time + HZ) &&
1430 lookupCacheEnabled) {
1431 if ((S_ISREG(direntry->d_inode->i_mode) == 0) ||
1432 (direntry->d_inode->i_nlink == 1)) {
1433 kfree(full_path);
1434 FreeXid(xid);
1435 return rc;
1436 } else {
1437 cFYI(1, ("Have to revalidate file due to hardlinks"));
1438 }
1439 }
1440
1441 /* save mtime and size */
1442 local_mtime = direntry->d_inode->i_mtime;
1443 local_size = direntry->d_inode->i_size;
1444
1445 if (cifs_sb->tcon->unix_ext) {
1446 rc = cifs_get_inode_info_unix(&direntry->d_inode, full_path,
1447 direntry->d_sb, xid);
1448 if (rc) {
1449 cFYI(1, ("error on getting revalidate info %d", rc));
1450 /* if (rc != -ENOENT)
1451 rc = 0; */ /* BB should we cache info on
1452 certain errors? */
1453 }
1454 } else {
1455 rc = cifs_get_inode_info(&direntry->d_inode, full_path, NULL,
1456 direntry->d_sb, xid, NULL);
1457 if (rc) {
1458 cFYI(1, ("error on getting revalidate info %d", rc));
1459 /* if (rc != -ENOENT)
1460 rc = 0; */ /* BB should we cache info on
1461 certain errors? */
1462 }
1463 }
1464 /* should we remap certain errors, access denied?, to zero */
1465
1466 /* if not oplocked, we invalidate inode pages if mtime or file size
1467 had changed on server */
1468
1469 if (timespec_equal(&local_mtime, &direntry->d_inode->i_mtime) &&
1470 (local_size == direntry->d_inode->i_size)) {
1471 cFYI(1, ("cifs_revalidate - inode unchanged"));
1472 } else {
1473 /* file may have changed on server */
1474 if (cifsInode->clientCanCacheRead) {
1475 /* no need to invalidate inode pages since we were the
1476 only ones who could have modified the file and the
1477 server copy is staler than ours */
1478 } else {
1479 invalidate_inode = true;
1480 }
1481 }
1482
1483 /* can not grab this sem since kernel filesys locking documentation
1484 indicates i_mutex may be taken by the kernel on lookup and rename
1485 which could deadlock if we grab the i_mutex here as well */
1486 /* mutex_lock(&direntry->d_inode->i_mutex);*/
1487 /* need to write out dirty pages here */
1488 if (direntry->d_inode->i_mapping) {
1489 /* do we need to lock inode until after invalidate completes
1490 below? */
1491 wbrc = filemap_fdatawrite(direntry->d_inode->i_mapping);
1492 if (wbrc)
1493 CIFS_I(direntry->d_inode)->write_behind_rc = wbrc;
1494 }
1495 if (invalidate_inode) {
1496 /* shrink_dcache not necessary now that cifs dentry ops
1497 are exported for negative dentries */
1498 /* if (S_ISDIR(direntry->d_inode->i_mode))
1499 shrink_dcache_parent(direntry); */
1500 if (S_ISREG(direntry->d_inode->i_mode)) {
1501 if (direntry->d_inode->i_mapping) {
1502 wbrc = filemap_fdatawait(direntry->d_inode->i_mapping);
1503 if (wbrc)
1504 CIFS_I(direntry->d_inode)->write_behind_rc = wbrc;
1505 }
1506 /* may eventually have to do this for open files too */
1507 if (list_empty(&(cifsInode->openFileList))) {
1508 /* changed on server - flush read ahead pages */
1509 cFYI(1, ("Invalidating read ahead data on "
1510 "closed file"));
1511 invalidate_remote_inode(direntry->d_inode);
1512 }
1513 }
1514 }
1515 /* mutex_unlock(&direntry->d_inode->i_mutex); */
1516
1517 kfree(full_path);
1518 FreeXid(xid);
1519 return rc;
1520 }
1521
1522 int cifs_getattr(struct vfsmount *mnt, struct dentry *dentry,
1523 struct kstat *stat)
1524 {
1525 int err = cifs_revalidate(dentry);
1526 if (!err) {
1527 generic_fillattr(dentry->d_inode, stat);
1528 stat->blksize = CIFS_MAX_MSGSIZE;
1529 }
1530 return err;
1531 }
1532
1533 static int cifs_truncate_page(struct address_space *mapping, loff_t from)
1534 {
1535 pgoff_t index = from >> PAGE_CACHE_SHIFT;
1536 unsigned offset = from & (PAGE_CACHE_SIZE - 1);
1537 struct page *page;
1538 int rc = 0;
1539
1540 page = grab_cache_page(mapping, index);
1541 if (!page)
1542 return -ENOMEM;
1543
1544 zero_user_segment(page, offset, PAGE_CACHE_SIZE);
1545 unlock_page(page);
1546 page_cache_release(page);
1547 return rc;
1548 }
1549
1550 static int cifs_vmtruncate(struct inode *inode, loff_t offset)
1551 {
1552 struct address_space *mapping = inode->i_mapping;
1553 unsigned long limit;
1554
1555 spin_lock(&inode->i_lock);
1556 if (inode->i_size < offset)
1557 goto do_expand;
1558 /*
1559 * truncation of in-use swapfiles is disallowed - it would cause
1560 * subsequent swapout to scribble on the now-freed blocks.
1561 */
1562 if (IS_SWAPFILE(inode)) {
1563 spin_unlock(&inode->i_lock);
1564 goto out_busy;
1565 }
1566 i_size_write(inode, offset);
1567 spin_unlock(&inode->i_lock);
1568 /*
1569 * unmap_mapping_range is called twice, first simply for efficiency
1570 * so that truncate_inode_pages does fewer single-page unmaps. However
1571 * after this first call, and before truncate_inode_pages finishes,
1572 * it is possible for private pages to be COWed, which remain after
1573 * truncate_inode_pages finishes, hence the second unmap_mapping_range
1574 * call must be made for correctness.
1575 */
1576 unmap_mapping_range(mapping, offset + PAGE_SIZE - 1, 0, 1);
1577 truncate_inode_pages(mapping, offset);
1578 unmap_mapping_range(mapping, offset + PAGE_SIZE - 1, 0, 1);
1579 goto out_truncate;
1580
1581 do_expand:
1582 limit = current->signal->rlim[RLIMIT_FSIZE].rlim_cur;
1583 if (limit != RLIM_INFINITY && offset > limit) {
1584 spin_unlock(&inode->i_lock);
1585 goto out_sig;
1586 }
1587 if (offset > inode->i_sb->s_maxbytes) {
1588 spin_unlock(&inode->i_lock);
1589 goto out_big;
1590 }
1591 i_size_write(inode, offset);
1592 spin_unlock(&inode->i_lock);
1593 out_truncate:
1594 if (inode->i_op && inode->i_op->truncate)
1595 inode->i_op->truncate(inode);
1596 return 0;
1597 out_sig:
1598 send_sig(SIGXFSZ, current, 0);
1599 out_big:
1600 return -EFBIG;
1601 out_busy:
1602 return -ETXTBSY;
1603 }
1604
1605 static int
1606 cifs_set_file_size(struct inode *inode, struct iattr *attrs,
1607 int xid, char *full_path)
1608 {
1609 int rc;
1610 struct cifsFileInfo *open_file;
1611 struct cifsInodeInfo *cifsInode = CIFS_I(inode);
1612 struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
1613 struct cifsTconInfo *pTcon = cifs_sb->tcon;
1614
1615 /*
1616 * To avoid spurious oplock breaks from server, in the case of
1617 * inodes that we already have open, avoid doing path based
1618 * setting of file size if we can do it by handle.
1619 * This keeps our caching token (oplock) and avoids timeouts
1620 * when the local oplock break takes longer to flush
1621 * writebehind data than the SMB timeout for the SetPathInfo
1622 * request would allow
1623 */
1624 open_file = find_writable_file(cifsInode);
1625 if (open_file) {
1626 __u16 nfid = open_file->netfid;
1627 __u32 npid = open_file->pid;
1628 rc = CIFSSMBSetFileSize(xid, pTcon, attrs->ia_size, nfid,
1629 npid, false);
1630 atomic_dec(&open_file->wrtPending);
1631 cFYI(1, ("SetFSize for attrs rc = %d", rc));
1632 if ((rc == -EINVAL) || (rc == -EOPNOTSUPP)) {
1633 unsigned int bytes_written;
1634 rc = CIFSSMBWrite(xid, pTcon, nfid, 0, attrs->ia_size,
1635 &bytes_written, NULL, NULL, 1);
1636 cFYI(1, ("Wrt seteof rc %d", rc));
1637 }
1638 } else
1639 rc = -EINVAL;
1640
1641 if (rc != 0) {
1642 /* Set file size by pathname rather than by handle
1643 either because no valid, writeable file handle for
1644 it was found or because there was an error setting
1645 it by handle */
1646 rc = CIFSSMBSetEOF(xid, pTcon, full_path, attrs->ia_size,
1647 false, cifs_sb->local_nls,
1648 cifs_sb->mnt_cifs_flags &
1649 CIFS_MOUNT_MAP_SPECIAL_CHR);
1650 cFYI(1, ("SetEOF by path (setattrs) rc = %d", rc));
1651 if ((rc == -EINVAL) || (rc == -EOPNOTSUPP)) {
1652 __u16 netfid;
1653 int oplock = 0;
1654
1655 rc = SMBLegacyOpen(xid, pTcon, full_path,
1656 FILE_OPEN, GENERIC_WRITE,
1657 CREATE_NOT_DIR, &netfid, &oplock, NULL,
1658 cifs_sb->local_nls,
1659 cifs_sb->mnt_cifs_flags &
1660 CIFS_MOUNT_MAP_SPECIAL_CHR);
1661 if (rc == 0) {
1662 unsigned int bytes_written;
1663 rc = CIFSSMBWrite(xid, pTcon, netfid, 0,
1664 attrs->ia_size,
1665 &bytes_written, NULL,
1666 NULL, 1);
1667 cFYI(1, ("wrt seteof rc %d", rc));
1668 CIFSSMBClose(xid, pTcon, netfid);
1669 }
1670 }
1671 }
1672
1673 if (rc == 0) {
1674 rc = cifs_vmtruncate(inode, attrs->ia_size);
1675 cifs_truncate_page(inode->i_mapping, inode->i_size);
1676 }
1677
1678 return rc;
1679 }
1680
1681 static int
1682 cifs_setattr_unix(struct dentry *direntry, struct iattr *attrs)
1683 {
1684 int rc;
1685 int xid;
1686 char *full_path = NULL;
1687 struct inode *inode = direntry->d_inode;
1688 struct cifsInodeInfo *cifsInode = CIFS_I(inode);
1689 struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
1690 struct cifsTconInfo *pTcon = cifs_sb->tcon;
1691 struct cifs_unix_set_info_args *args = NULL;
1692
1693 cFYI(1, ("setattr_unix on file %s attrs->ia_valid=0x%x",
1694 direntry->d_name.name, attrs->ia_valid));
1695
1696 xid = GetXid();
1697
1698 if ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_PERM) == 0) {
1699 /* check if we have permission to change attrs */
1700 rc = inode_change_ok(inode, attrs);
1701 if (rc < 0)
1702 goto out;
1703 else
1704 rc = 0;
1705 }
1706
1707 full_path = build_path_from_dentry(direntry);
1708 if (full_path == NULL) {
1709 rc = -ENOMEM;
1710 goto out;
1711 }
1712
1713 if ((attrs->ia_valid & ATTR_MTIME) || (attrs->ia_valid & ATTR_SIZE)) {
1714 /*
1715 Flush data before changing file size or changing the last
1716 write time of the file on the server. If the
1717 flush returns error, store it to report later and continue.
1718 BB: This should be smarter. Why bother flushing pages that
1719 will be truncated anyway? Also, should we error out here if
1720 the flush returns error?
1721 */
1722 rc = filemap_write_and_wait(inode->i_mapping);
1723 if (rc != 0) {
1724 cifsInode->write_behind_rc = rc;
1725 rc = 0;
1726 }
1727 }
1728
1729 if (attrs->ia_valid & ATTR_SIZE) {
1730 rc = cifs_set_file_size(inode, attrs, xid, full_path);
1731 if (rc != 0)
1732 goto out;
1733 }
1734
1735 /* skip mode change if it's just for clearing setuid/setgid */
1736 if (attrs->ia_valid & (ATTR_KILL_SUID|ATTR_KILL_SGID))
1737 attrs->ia_valid &= ~ATTR_MODE;
1738
1739 args = kmalloc(sizeof(*args), GFP_KERNEL);
1740 if (args == NULL) {
1741 rc = -ENOMEM;
1742 goto out;
1743 }
1744
1745 /* set up the struct */
1746 if (attrs->ia_valid & ATTR_MODE)
1747 args->mode = attrs->ia_mode;
1748 else
1749 args->mode = NO_CHANGE_64;
1750
1751 if (attrs->ia_valid & ATTR_UID)
1752 args->uid = attrs->ia_uid;
1753 else
1754 args->uid = NO_CHANGE_64;
1755
1756 if (attrs->ia_valid & ATTR_GID)
1757 args->gid = attrs->ia_gid;
1758 else
1759 args->gid = NO_CHANGE_64;
1760
1761 if (attrs->ia_valid & ATTR_ATIME)
1762 args->atime = cifs_UnixTimeToNT(attrs->ia_atime);
1763 else
1764 args->atime = NO_CHANGE_64;
1765
1766 if (attrs->ia_valid & ATTR_MTIME)
1767 args->mtime = cifs_UnixTimeToNT(attrs->ia_mtime);
1768 else
1769 args->mtime = NO_CHANGE_64;
1770
1771 if (attrs->ia_valid & ATTR_CTIME)
1772 args->ctime = cifs_UnixTimeToNT(attrs->ia_ctime);
1773 else
1774 args->ctime = NO_CHANGE_64;
1775
1776 args->device = 0;
1777 rc = CIFSSMBUnixSetInfo(xid, pTcon, full_path, args,
1778 cifs_sb->local_nls,
1779 cifs_sb->mnt_cifs_flags &
1780 CIFS_MOUNT_MAP_SPECIAL_CHR);
1781
1782 if (!rc)
1783 rc = inode_setattr(inode, attrs);
1784 out:
1785 kfree(args);
1786 kfree(full_path);
1787 FreeXid(xid);
1788 return rc;
1789 }
1790
1791 static int
1792 cifs_setattr_nounix(struct dentry *direntry, struct iattr *attrs)
1793 {
1794 int xid;
1795 struct inode *inode = direntry->d_inode;
1796 struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
1797 struct cifsInodeInfo *cifsInode = CIFS_I(inode);
1798 char *full_path = NULL;
1799 int rc = -EACCES;
1800 __u32 dosattr = 0;
1801 __u64 mode = NO_CHANGE_64;
1802
1803 xid = GetXid();
1804
1805 cFYI(1, ("setattr on file %s attrs->iavalid 0x%x",
1806 direntry->d_name.name, attrs->ia_valid));
1807
1808 if ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_PERM) == 0) {
1809 /* check if we have permission to change attrs */
1810 rc = inode_change_ok(inode, attrs);
1811 if (rc < 0) {
1812 FreeXid(xid);
1813 return rc;
1814 } else
1815 rc = 0;
1816 }
1817
1818 full_path = build_path_from_dentry(direntry);
1819 if (full_path == NULL) {
1820 FreeXid(xid);
1821 return -ENOMEM;
1822 }
1823
1824 if ((attrs->ia_valid & ATTR_MTIME) || (attrs->ia_valid & ATTR_SIZE)) {
1825 /*
1826 Flush data before changing file size or changing the last
1827 write time of the file on the server. If the
1828 flush returns error, store it to report later and continue.
1829 BB: This should be smarter. Why bother flushing pages that
1830 will be truncated anyway? Also, should we error out here if
1831 the flush returns error?
1832 */
1833 rc = filemap_write_and_wait(inode->i_mapping);
1834 if (rc != 0) {
1835 cifsInode->write_behind_rc = rc;
1836 rc = 0;
1837 }
1838 }
1839
1840 if (attrs->ia_valid & ATTR_SIZE) {
1841 rc = cifs_set_file_size(inode, attrs, xid, full_path);
1842 if (rc != 0)
1843 goto cifs_setattr_exit;
1844 }
1845
1846 /*
1847 * Without unix extensions we can't send ownership changes to the
1848 * server, so silently ignore them. This is consistent with how
1849 * local DOS/Windows filesystems behave (VFAT, NTFS, etc). With
1850 * CIFSACL support + proper Windows to Unix idmapping, we may be
1851 * able to support this in the future.
1852 */
1853 if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SET_UID))
1854 attrs->ia_valid &= ~(ATTR_UID | ATTR_GID);
1855
1856 /* skip mode change if it's just for clearing setuid/setgid */
1857 if (attrs->ia_valid & (ATTR_KILL_SUID|ATTR_KILL_SGID))
1858 attrs->ia_valid &= ~ATTR_MODE;
1859
1860 if (attrs->ia_valid & ATTR_MODE) {
1861 cFYI(1, ("Mode changed to 0%o", attrs->ia_mode));
1862 mode = attrs->ia_mode;
1863 }
1864
1865 if (attrs->ia_valid & ATTR_MODE) {
1866 rc = 0;
1867 #ifdef CONFIG_CIFS_EXPERIMENTAL
1868 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_CIFS_ACL)
1869 rc = mode_to_acl(inode, full_path, mode);
1870 else
1871 #endif
1872 if (((mode & S_IWUGO) == 0) &&
1873 (cifsInode->cifsAttrs & ATTR_READONLY) == 0) {
1874
1875 dosattr = cifsInode->cifsAttrs | ATTR_READONLY;
1876
1877 /* fix up mode if we're not using dynperm */
1878 if ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DYNPERM) == 0)
1879 attrs->ia_mode = inode->i_mode & ~S_IWUGO;
1880 } else if ((mode & S_IWUGO) &&
1881 (cifsInode->cifsAttrs & ATTR_READONLY)) {
1882
1883 dosattr = cifsInode->cifsAttrs & ~ATTR_READONLY;
1884 /* Attributes of 0 are ignored */
1885 if (dosattr == 0)
1886 dosattr |= ATTR_NORMAL;
1887
1888 /* reset local inode permissions to normal */
1889 if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DYNPERM)) {
1890 attrs->ia_mode &= ~(S_IALLUGO);
1891 if (S_ISDIR(inode->i_mode))
1892 attrs->ia_mode |=
1893 cifs_sb->mnt_dir_mode;
1894 else
1895 attrs->ia_mode |=
1896 cifs_sb->mnt_file_mode;
1897 }
1898 } else if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DYNPERM)) {
1899 /* ignore mode change - ATTR_READONLY hasn't changed */
1900 attrs->ia_valid &= ~ATTR_MODE;
1901 }
1902 }
1903
1904 if (attrs->ia_valid & (ATTR_MTIME|ATTR_ATIME|ATTR_CTIME) ||
1905 ((attrs->ia_valid & ATTR_MODE) && dosattr)) {
1906 rc = cifs_set_file_info(inode, attrs, xid, full_path, dosattr);
1907 /* BB: check for rc = -EOPNOTSUPP and switch to legacy mode */
1908
1909 /* Even if error on time set, no sense failing the call if
1910 the server would set the time to a reasonable value anyway,
1911 and this check ensures that we are not being called from
1912 sys_utimes in which case we ought to fail the call back to
1913 the user when the server rejects the call */
1914 if ((rc) && (attrs->ia_valid &
1915 (ATTR_MODE | ATTR_GID | ATTR_UID | ATTR_SIZE)))
1916 rc = 0;
1917 }
1918
1919 /* do not need local check to inode_check_ok since the server does
1920 that */
1921 if (!rc)
1922 rc = inode_setattr(inode, attrs);
1923 cifs_setattr_exit:
1924 kfree(full_path);
1925 FreeXid(xid);
1926 return rc;
1927 }
1928
1929 int
1930 cifs_setattr(struct dentry *direntry, struct iattr *attrs)
1931 {
1932 struct inode *inode = direntry->d_inode;
1933 struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
1934 struct cifsTconInfo *pTcon = cifs_sb->tcon;
1935
1936 if (pTcon->unix_ext)
1937 return cifs_setattr_unix(direntry, attrs);
1938
1939 return cifs_setattr_nounix(direntry, attrs);
1940
1941 /* BB: add cifs_setattr_legacy for really old servers */
1942 }
1943
1944 #if 0
1945 void cifs_delete_inode(struct inode *inode)
1946 {
1947 cFYI(1, ("In cifs_delete_inode, inode = 0x%p", inode));
1948 /* may have to add back in if and when safe distributed caching of
1949 directories added e.g. via FindNotify */
1950 }
1951 #endif
Linux kernel - Deliverables
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