]> git.proxmox.com Git - mirror_ubuntu-zesty-kernel.git/blob - fs/cifs/inode.c
projects / mirror_ubuntu-zesty-kernel.git / blob
? search:


954b670f1687b2245d5080571edc6ee846871f62
[mirror_ubuntu-zesty-kernel.git] / fs / cifs / inode.c
1 /*
2 * fs/cifs/inode.c
3 *
4 * Copyright (C) International Business Machines Corp., 2002,2007
5 * Author(s): Steve French (sfrench@us.ibm.com)
6 *
7 * This library is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU Lesser General Public License as published
9 * by the Free Software Foundation; either version 2.1 of the License, or
10 * (at your option) any later version.
11 *
12 * This library is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See
15 * the GNU Lesser General Public License for more details.
16 *
17 * You should have received a copy of the GNU Lesser General Public License
18 * along with this library; if not, write to the Free Software
19 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
20 */
21 #include <linux/fs.h>
22 #include <linux/stat.h>
23 #include <linux/pagemap.h>
24 #include <asm/div64.h>
25 #include "cifsfs.h"
26 #include "cifspdu.h"
27 #include "cifsglob.h"
28 #include "cifsproto.h"
29 #include "cifs_debug.h"
30 #include "cifs_fs_sb.h"
31
32
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
550 inode->i_mode &= ~S_IFMT;
551 }
552 /* clear write bits if ATTR_READONLY is set */
553 if (attr & ATTR_READONLY)
554 inode->i_mode &= ~S_IWUGO;
555
556 /* set inode type */
557 if ((attr & ATTR_SYSTEM) &&
558 (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_UNX_EMUL)) {
559 /* no need to fix endianness on 0 */
560 if (pfindData->EndOfFile == 0)
561 inode->i_mode |= S_IFIFO;
562 else if (decode_sfu_inode(inode,
563 le64_to_cpu(pfindData->EndOfFile),
564 full_path, cifs_sb, xid))
565 cFYI(1, ("unknown SFU file type\n"));
566 } else {
567 if (attr & ATTR_DIRECTORY)
568 inode->i_mode |= S_IFDIR;
569 else
570 inode->i_mode |= S_IFREG;
571 }
572
573 spin_lock(&inode->i_lock);
574 if (is_size_safe_to_change(cifsInfo,
575 le64_to_cpu(pfindData->EndOfFile))) {
576 /* can not safely shrink the file size here if the
577 client is writing to it due to potential races */
578 i_size_write(inode, le64_to_cpu(pfindData->EndOfFile));
579
580 /* 512 bytes (2**9) is the fake blocksize that must be
581 used for this calculation */
582 inode->i_blocks = (512 - 1 + le64_to_cpu(
583 pfindData->AllocationSize)) >> 9;
584 }
585 spin_unlock(&inode->i_lock);
586
587 inode->i_nlink = le32_to_cpu(pfindData->NumberOfLinks);
588
589 /* BB fill in uid and gid here? with help from winbind?
590 or retrieve from NTFS stream extended attribute */
591 #ifdef CONFIG_CIFS_EXPERIMENTAL
592 /* fill in 0777 bits from ACL */
593 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_CIFS_ACL) {
594 cFYI(1, ("Getting mode bits from ACL"));
595 acl_to_uid_mode(inode, full_path, pfid);
596 }
597 #endif
598 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_UNX_EMUL) {
599 /* fill in remaining high mode bits e.g. SUID, VTX */
600 get_sfu_mode(inode, full_path, cifs_sb, xid);
601 } else if (atomic_read(&cifsInfo->inUse) == 0) {
602 inode->i_uid = cifs_sb->mnt_uid;
603 inode->i_gid = cifs_sb->mnt_gid;
604 /* set so we do not keep refreshing these fields with
605 bad data after user has changed them in memory */
606 atomic_set(&cifsInfo->inUse, 1);
607 }
608
609 cifs_set_ops(inode, is_dfs_referral);
610
611
612
613
614 cgii_exit:
615 kfree(buf);
616 return rc;
617 }
618
619 static const struct inode_operations cifs_ipc_inode_ops = {
620 .lookup = cifs_lookup,
621 };
622
623 /* gets root inode */
624 struct inode *cifs_iget(struct super_block *sb, unsigned long ino)
625 {
626 int xid;
627 struct cifs_sb_info *cifs_sb;
628 struct inode *inode;
629 long rc;
630
631 inode = iget_locked(sb, ino);
632 if (!inode)
633 return ERR_PTR(-ENOMEM);
634 if (!(inode->i_state & I_NEW))
635 return inode;
636
637 cifs_sb = CIFS_SB(inode->i_sb);
638 xid = GetXid();
639
640 if (cifs_sb->tcon->unix_ext)
641 rc = cifs_get_inode_info_unix(&inode, "", inode->i_sb, xid);
642 else
643 rc = cifs_get_inode_info(&inode, "", NULL, inode->i_sb, xid,
644 NULL);
645 if (rc && cifs_sb->tcon->ipc) {
646 cFYI(1, ("ipc connection - fake read inode"));
647 inode->i_mode |= S_IFDIR;
648 inode->i_nlink = 2;
649 inode->i_op = &cifs_ipc_inode_ops;
650 inode->i_fop = &simple_dir_operations;
651 inode->i_uid = cifs_sb->mnt_uid;
652 inode->i_gid = cifs_sb->mnt_gid;
653 } else if (rc) {
654 _FreeXid(xid);
655 iget_failed(inode);
656 return ERR_PTR(rc);
657 }
658
659 unlock_new_inode(inode);
660
661 /* can not call macro FreeXid here since in a void func
662 * TODO: This is no longer true
663 */
664 _FreeXid(xid);
665 return inode;
666 }
667
668 static int
669 cifs_set_file_info(struct inode *inode, struct iattr *attrs, int xid,
670 char *full_path, __u32 dosattr)
671 {
672 int rc;
673 int oplock = 0;
674 __u16 netfid;
675 __u32 netpid;
676 bool set_time = false;
677 struct cifsFileInfo *open_file;
678 struct cifsInodeInfo *cifsInode = CIFS_I(inode);
679 struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
680 struct cifsTconInfo *pTcon = cifs_sb->tcon;
681 FILE_BASIC_INFO info_buf;
682
683 if (attrs->ia_valid & ATTR_ATIME) {
684 set_time = true;
685 info_buf.LastAccessTime =
686 cpu_to_le64(cifs_UnixTimeToNT(attrs->ia_atime));
687 } else
688 info_buf.LastAccessTime = 0;
689
690 if (attrs->ia_valid & ATTR_MTIME) {
691 set_time = true;
692 info_buf.LastWriteTime =
693 cpu_to_le64(cifs_UnixTimeToNT(attrs->ia_mtime));
694 } else
695 info_buf.LastWriteTime = 0;
696
697 /*
698 * Samba throws this field away, but windows may actually use it.
699 * Do not set ctime unless other time stamps are changed explicitly
700 * (i.e. by utimes()) since we would then have a mix of client and
701 * server times.
702 */
703 if (set_time && (attrs->ia_valid & ATTR_CTIME)) {
704 cFYI(1, ("CIFS - CTIME changed"));
705 info_buf.ChangeTime =
706 cpu_to_le64(cifs_UnixTimeToNT(attrs->ia_ctime));
707 } else
708 info_buf.ChangeTime = 0;
709
710 info_buf.CreationTime = 0; /* don't change */
711 info_buf.Attributes = cpu_to_le32(dosattr);
712
713 /*
714 * If the file is already open for write, just use that fileid
715 */
716 open_file = find_writable_file(cifsInode);
717 if (open_file) {
718 netfid = open_file->netfid;
719 netpid = open_file->pid;
720 goto set_via_filehandle;
721 }
722
723 /*
724 * NT4 apparently returns success on this call, but it doesn't
725 * really work.
726 */
727 if (!(pTcon->ses->flags & CIFS_SES_NT4)) {
728 rc = CIFSSMBSetPathInfo(xid, pTcon, full_path,
729 &info_buf, cifs_sb->local_nls,
730 cifs_sb->mnt_cifs_flags &
731 CIFS_MOUNT_MAP_SPECIAL_CHR);
732 if (rc != -EOPNOTSUPP && rc != -EINVAL)
733 goto out;
734 }
735
736 cFYI(1, ("calling SetFileInfo since SetPathInfo for "
737 "times not supported by this server"));
738 rc = CIFSSMBOpen(xid, pTcon, full_path, FILE_OPEN,
739 SYNCHRONIZE | FILE_WRITE_ATTRIBUTES,
740 CREATE_NOT_DIR, &netfid, &oplock,
741 NULL, cifs_sb->local_nls,
742 cifs_sb->mnt_cifs_flags &
743 CIFS_MOUNT_MAP_SPECIAL_CHR);
744
745 if (rc != 0) {
746 if (rc == -EIO)
747 rc = -EINVAL;
748 goto out;
749 }
750
751 netpid = current->tgid;
752
753 set_via_filehandle:
754 rc = CIFSSMBSetFileInfo(xid, pTcon, &info_buf, netfid, netpid);
755 if (open_file == NULL)
756 CIFSSMBClose(xid, pTcon, netfid);
757 else
758 atomic_dec(&open_file->wrtPending);
759 out:
760 return rc;
761 }
762
763 /*
764 * open the given file (if it isn't already), set the DELETE_ON_CLOSE bit
765 * and rename it to a random name that hopefully won't conflict with
766 * anything else.
767 */
768 static int
769 cifs_rename_pending_delete(char *full_path, struct inode *inode, int xid)
770 {
771 int oplock = 0;
772 int rc;
773 __u16 netfid;
774 struct cifsInodeInfo *cifsInode = CIFS_I(inode);
775 struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
776 struct cifsTconInfo *tcon = cifs_sb->tcon;
777 __u32 dosattr;
778 FILE_BASIC_INFO *info_buf;
779
780 rc = CIFSSMBOpen(xid, tcon, full_path, FILE_OPEN,
781 DELETE|FILE_WRITE_ATTRIBUTES, CREATE_NOT_DIR,
782 &netfid, &oplock, NULL, cifs_sb->local_nls,
783 cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR);
784 if (rc != 0)
785 goto out;
786
787 /* set ATTR_HIDDEN and clear ATTR_READONLY */
788 cifsInode = CIFS_I(inode);
789 dosattr = cifsInode->cifsAttrs & ~ATTR_READONLY;
790 if (dosattr == 0)
791 dosattr |= ATTR_NORMAL;
792 dosattr |= ATTR_HIDDEN;
793
794 info_buf = kzalloc(sizeof(*info_buf), GFP_KERNEL);
795 if (info_buf == NULL) {
796 rc = -ENOMEM;
797 goto out_close;
798 }
799 info_buf->Attributes = cpu_to_le32(dosattr);
800 rc = CIFSSMBSetFileInfo(xid, tcon, info_buf, netfid, current->tgid);
801 kfree(info_buf);
802 if (rc != 0)
803 goto out_close;
804
805 /* silly-rename the file */
806 rc = CIFSSMBRenameOpenFile(xid, tcon, netfid, NULL, cifs_sb->local_nls,
807 cifs_sb->mnt_cifs_flags &
808 CIFS_MOUNT_MAP_SPECIAL_CHR);
809 if (rc != 0)
810 goto out_close;
811
812 /* set DELETE_ON_CLOSE */
813 rc = CIFSSMBSetFileDisposition(xid, tcon, true, netfid, current->tgid);
814
815 out_close:
816 CIFSSMBClose(xid, tcon, netfid);
817 out:
818 return rc;
819 }
820
821 int cifs_unlink(struct inode *dir, struct dentry *dentry)
822 {
823 int rc = 0;
824 int xid;
825 char *full_path = NULL;
826 struct inode *inode = dentry->d_inode;
827 struct cifsInodeInfo *cifsInode;
828 struct super_block *sb = dir->i_sb;
829 struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
830 struct cifsTconInfo *tcon = cifs_sb->tcon;
831 struct iattr *attrs;
832 __u32 dosattr;
833
834 cFYI(1, ("cifs_unlink, dir=0x%p, dentry=0x%p", dir, dentry));
835
836 xid = GetXid();
837
838 /* Unlink can be called from rename so we can not take the
839 * sb->s_vfs_rename_mutex here */
840 full_path = build_path_from_dentry(dentry);
841 if (full_path == NULL) {
842 FreeXid(xid);
843 return -ENOMEM;
844 }
845
846 if ((tcon->ses->capabilities & CAP_UNIX) &&
847 (CIFS_UNIX_POSIX_PATH_OPS_CAP &
848 le64_to_cpu(tcon->fsUnixInfo.Capability))) {
849 rc = CIFSPOSIXDelFile(xid, tcon, full_path,
850 SMB_POSIX_UNLINK_FILE_TARGET, cifs_sb->local_nls,
851 cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR);
852 cFYI(1, ("posix del rc %d", rc));
853 if ((rc == 0) || (rc == -ENOENT))
854 goto psx_del_no_retry;
855 }
856
857 rc = CIFSSMBDelFile(xid, tcon, full_path, cifs_sb->local_nls,
858 cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR);
859 psx_del_no_retry:
860 if (!rc) {
861 if (inode)
862 drop_nlink(inode);
863 } else if (rc == -ENOENT) {
864 d_drop(dentry);
865 } else if (rc == -ETXTBSY) {
866 rc = cifs_rename_pending_delete(full_path, inode, xid);
867 if (rc == 0)
868 drop_nlink(inode);
869 } else if (rc == -EACCES) {
870 /* try only if r/o attribute set in local lookup data? */
871 attrs = kzalloc(sizeof(*attrs), GFP_KERNEL);
872 if (attrs == NULL) {
873 rc = -ENOMEM;
874 goto out_reval;
875 }
876
877 /* try to reset dos attributes */
878 cifsInode = CIFS_I(inode);
879 dosattr = cifsInode->cifsAttrs & ~ATTR_READONLY;
880 if (dosattr == 0)
881 dosattr |= ATTR_NORMAL;
882 dosattr |= ATTR_HIDDEN;
883
884 rc = cifs_set_file_info(inode, attrs, xid, full_path, dosattr);
885 kfree(attrs);
886 if (rc != 0)
887 goto out_reval;
888 rc = CIFSSMBDelFile(xid, tcon, full_path, cifs_sb->local_nls,
889 cifs_sb->mnt_cifs_flags &
890 CIFS_MOUNT_MAP_SPECIAL_CHR);
891 if (rc == 0) {
892 if (inode)
893 drop_nlink(inode);
894 } else if (rc == -ETXTBSY) {
895 rc = cifs_rename_pending_delete(full_path, inode, xid);
896 if (rc == 0)
897 drop_nlink(inode);
898 }
899 }
900 out_reval:
901 if (inode) {
902 cifsInode = CIFS_I(inode);
903 cifsInode->time = 0; /* will force revalidate to get info
904 when needed */
905 inode->i_ctime = current_fs_time(sb);
906 }
907 dir->i_ctime = dir->i_mtime = current_fs_time(sb);
908 cifsInode = CIFS_I(dir);
909 cifsInode->time = 0; /* force revalidate of dir as well */
910
911 kfree(full_path);
912 FreeXid(xid);
913 return rc;
914 }
915
916 static void posix_fill_in_inode(struct inode *tmp_inode,
917 FILE_UNIX_BASIC_INFO *pData, int isNewInode)
918 {
919 struct cifsInodeInfo *cifsInfo = CIFS_I(tmp_inode);
920 loff_t local_size;
921 struct timespec local_mtime;
922
923 cifsInfo->time = jiffies;
924 atomic_inc(&cifsInfo->inUse);
925
926 /* save mtime and size */
927 local_mtime = tmp_inode->i_mtime;
928 local_size = tmp_inode->i_size;
929
930 cifs_unix_info_to_inode(tmp_inode, pData, 1);
931 cifs_set_ops(tmp_inode, false);
932
933 if (!S_ISREG(tmp_inode->i_mode))
934 return;
935
936 /*
937 * No sense invalidating pages for new inode
938 * since we we have not started caching
939 * readahead file data yet.
940 */
941 if (isNewInode)
942 return;
943
944 if (timespec_equal(&tmp_inode->i_mtime, &local_mtime) &&
945 (local_size == tmp_inode->i_size)) {
946 cFYI(1, ("inode exists but unchanged"));
947 } else {
948 /* file may have changed on server */
949 cFYI(1, ("invalidate inode, readdir detected change"));
950 invalidate_remote_inode(tmp_inode);
951 }
952 }
953
954 int cifs_mkdir(struct inode *inode, struct dentry *direntry, int mode)
955 {
956 int rc = 0;
957 int xid;
958 struct cifs_sb_info *cifs_sb;
959 struct cifsTconInfo *pTcon;
960 char *full_path = NULL;
961 struct inode *newinode = NULL;
962
963 cFYI(1, ("In cifs_mkdir, mode = 0x%x inode = 0x%p", mode, inode));
964
965 xid = GetXid();
966
967 cifs_sb = CIFS_SB(inode->i_sb);
968 pTcon = cifs_sb->tcon;
969
970 full_path = build_path_from_dentry(direntry);
971 if (full_path == NULL) {
972 FreeXid(xid);
973 return -ENOMEM;
974 }
975
976 if ((pTcon->ses->capabilities & CAP_UNIX) &&
977 (CIFS_UNIX_POSIX_PATH_OPS_CAP &
978 le64_to_cpu(pTcon->fsUnixInfo.Capability))) {
979 u32 oplock = 0;
980 FILE_UNIX_BASIC_INFO *pInfo =
981 kzalloc(sizeof(FILE_UNIX_BASIC_INFO), GFP_KERNEL);
982 if (pInfo == NULL) {
983 rc = -ENOMEM;
984 goto mkdir_out;
985 }
986
987 mode &= ~current->fs->umask;
988 rc = CIFSPOSIXCreate(xid, pTcon, SMB_O_DIRECTORY | SMB_O_CREAT,
989 mode, NULL /* netfid */, pInfo, &oplock,
990 full_path, cifs_sb->local_nls,
991 cifs_sb->mnt_cifs_flags &
992 CIFS_MOUNT_MAP_SPECIAL_CHR);
993 if (rc == -EOPNOTSUPP) {
994 kfree(pInfo);
995 goto mkdir_retry_old;
996 } else if (rc) {
997 cFYI(1, ("posix mkdir returned 0x%x", rc));
998 d_drop(direntry);
999 } else {
1000 if (pInfo->Type == cpu_to_le32(-1)) {
1001 /* no return info, go query for it */
1002 kfree(pInfo);
1003 goto mkdir_get_info;
1004 }
1005 /*BB check (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SET_UID ) to see if need
1006 to set uid/gid */
1007 inc_nlink(inode);
1008 if (pTcon->nocase)
1009 direntry->d_op = &cifs_ci_dentry_ops;
1010 else
1011 direntry->d_op = &cifs_dentry_ops;
1012
1013 newinode = new_inode(inode->i_sb);
1014 if (newinode == NULL) {
1015 kfree(pInfo);
1016 goto mkdir_get_info;
1017 }
1018 /* Is an i_ino of zero legal? */
1019 /* Are there sanity checks we can use to ensure that
1020 the server is really filling in that field? */
1021 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM) {
1022 newinode->i_ino =
1023 (unsigned long)pInfo->UniqueId;
1024 } /* note ino incremented to unique num in new_inode */
1025 if (inode->i_sb->s_flags & MS_NOATIME)
1026 newinode->i_flags |= S_NOATIME | S_NOCMTIME;
1027 newinode->i_nlink = 2;
1028
1029 insert_inode_hash(newinode);
1030 d_instantiate(direntry, newinode);
1031
1032 /* we already checked in POSIXCreate whether
1033 frame was long enough */
1034 posix_fill_in_inode(direntry->d_inode,
1035 pInfo, 1 /* NewInode */);
1036 #ifdef CONFIG_CIFS_DEBUG2
1037 cFYI(1, ("instantiated dentry %p %s to inode %p",
1038 direntry, direntry->d_name.name, newinode));
1039
1040 if (newinode->i_nlink != 2)
1041 cFYI(1, ("unexpected number of links %d",
1042 newinode->i_nlink));
1043 #endif
1044 }
1045 kfree(pInfo);
1046 goto mkdir_out;
1047 }
1048 mkdir_retry_old:
1049 /* BB add setting the equivalent of mode via CreateX w/ACLs */
1050 rc = CIFSSMBMkDir(xid, pTcon, full_path, cifs_sb->local_nls,
1051 cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR);
1052 if (rc) {
1053 cFYI(1, ("cifs_mkdir returned 0x%x", rc));
1054 d_drop(direntry);
1055 } else {
1056 mkdir_get_info:
1057 inc_nlink(inode);
1058 if (pTcon->unix_ext)
1059 rc = cifs_get_inode_info_unix(&newinode, full_path,
1060 inode->i_sb, xid);
1061 else
1062 rc = cifs_get_inode_info(&newinode, full_path, NULL,
1063 inode->i_sb, xid, NULL);
1064
1065 if (pTcon->nocase)
1066 direntry->d_op = &cifs_ci_dentry_ops;
1067 else
1068 direntry->d_op = &cifs_dentry_ops;
1069 d_instantiate(direntry, newinode);
1070 /* setting nlink not necessary except in cases where we
1071 * failed to get it from the server or was set bogus */
1072 if ((direntry->d_inode) && (direntry->d_inode->i_nlink < 2))
1073 direntry->d_inode->i_nlink = 2;
1074
1075 mode &= ~current->fs->umask;
1076 /* must turn on setgid bit if parent dir has it */
1077 if (inode->i_mode & S_ISGID)
1078 mode |= S_ISGID;
1079
1080 if (pTcon->unix_ext) {
1081 struct cifs_unix_set_info_args args = {
1082 .mode = mode,
1083 .ctime = NO_CHANGE_64,
1084 .atime = NO_CHANGE_64,
1085 .mtime = NO_CHANGE_64,
1086 .device = 0,
1087 };
1088 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SET_UID) {
1089 args.uid = (__u64)current->fsuid;
1090 if (inode->i_mode & S_ISGID)
1091 args.gid = (__u64)inode->i_gid;
1092 else
1093 args.gid = (__u64)current->fsgid;
1094 } else {
1095 args.uid = NO_CHANGE_64;
1096 args.gid = NO_CHANGE_64;
1097 }
1098 CIFSSMBUnixSetInfo(xid, pTcon, full_path, &args,
1099 cifs_sb->local_nls,
1100 cifs_sb->mnt_cifs_flags &
1101 CIFS_MOUNT_MAP_SPECIAL_CHR);
1102 } else {
1103 if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_CIFS_ACL) &&
1104 (mode & S_IWUGO) == 0) {
1105 FILE_BASIC_INFO pInfo;
1106 memset(&pInfo, 0, sizeof(pInfo));
1107 pInfo.Attributes = cpu_to_le32(ATTR_READONLY);
1108 CIFSSMBSetPathInfo(xid, pTcon, full_path,
1109 &pInfo, cifs_sb->local_nls,
1110 cifs_sb->mnt_cifs_flags &
1111 CIFS_MOUNT_MAP_SPECIAL_CHR);
1112 }
1113 if (direntry->d_inode) {
1114 if (cifs_sb->mnt_cifs_flags &
1115 CIFS_MOUNT_DYNPERM)
1116 direntry->d_inode->i_mode =
1117 (mode | S_IFDIR);
1118
1119 if (cifs_sb->mnt_cifs_flags &
1120 CIFS_MOUNT_SET_UID) {
1121 direntry->d_inode->i_uid =
1122 current->fsuid;
1123 if (inode->i_mode & S_ISGID)
1124 direntry->d_inode->i_gid =
1125 inode->i_gid;
1126 else
1127 direntry->d_inode->i_gid =
1128 current->fsgid;
1129 }
1130 }
1131 }
1132 }
1133 mkdir_out:
1134 kfree(full_path);
1135 FreeXid(xid);
1136 return rc;
1137 }
1138
1139 int cifs_rmdir(struct inode *inode, struct dentry *direntry)
1140 {
1141 int rc = 0;
1142 int xid;
1143 struct cifs_sb_info *cifs_sb;
1144 struct cifsTconInfo *pTcon;
1145 char *full_path = NULL;
1146 struct cifsInodeInfo *cifsInode;
1147
1148 cFYI(1, ("cifs_rmdir, inode = 0x%p", inode));
1149
1150 xid = GetXid();
1151
1152 cifs_sb = CIFS_SB(inode->i_sb);
1153 pTcon = cifs_sb->tcon;
1154
1155 full_path = build_path_from_dentry(direntry);
1156 if (full_path == NULL) {
1157 FreeXid(xid);
1158 return -ENOMEM;
1159 }
1160
1161 rc = CIFSSMBRmDir(xid, pTcon, full_path, cifs_sb->local_nls,
1162 cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR);
1163
1164 if (!rc) {
1165 drop_nlink(inode);
1166 spin_lock(&direntry->d_inode->i_lock);
1167 i_size_write(direntry->d_inode, 0);
1168 clear_nlink(direntry->d_inode);
1169 spin_unlock(&direntry->d_inode->i_lock);
1170 }
1171
1172 cifsInode = CIFS_I(direntry->d_inode);
1173 cifsInode->time = 0; /* force revalidate to go get info when
1174 needed */
1175 direntry->d_inode->i_ctime = inode->i_ctime = inode->i_mtime =
1176 current_fs_time(inode->i_sb);
1177
1178 kfree(full_path);
1179 FreeXid(xid);
1180 return rc;
1181 }
1182
1183 int cifs_rename(struct inode *source_inode, struct dentry *source_direntry,
1184 struct inode *target_inode, struct dentry *target_direntry)
1185 {
1186 char *fromName;
1187 char *toName;
1188 struct cifs_sb_info *cifs_sb_source;
1189 struct cifs_sb_info *cifs_sb_target;
1190 struct cifsTconInfo *pTcon;
1191 int xid;
1192 int rc = 0;
1193
1194 xid = GetXid();
1195
1196 cifs_sb_target = CIFS_SB(target_inode->i_sb);
1197 cifs_sb_source = CIFS_SB(source_inode->i_sb);
1198 pTcon = cifs_sb_source->tcon;
1199
1200 if (pTcon != cifs_sb_target->tcon) {
1201 FreeXid(xid);
1202 return -EXDEV; /* BB actually could be allowed if same server,
1203 but different share.
1204 Might eventually add support for this */
1205 }
1206
1207 /* we already have the rename sem so we do not need to grab it again
1208 here to protect the path integrity */
1209 fromName = build_path_from_dentry(source_direntry);
1210 toName = build_path_from_dentry(target_direntry);
1211 if ((fromName == NULL) || (toName == NULL)) {
1212 rc = -ENOMEM;
1213 goto cifs_rename_exit;
1214 }
1215
1216 rc = CIFSSMBRename(xid, pTcon, fromName, toName,
1217 cifs_sb_source->local_nls,
1218 cifs_sb_source->mnt_cifs_flags &
1219 CIFS_MOUNT_MAP_SPECIAL_CHR);
1220 if (rc == -EEXIST) {
1221 /* check if they are the same file because rename of hardlinked
1222 files is a noop */
1223 FILE_UNIX_BASIC_INFO *info_buf_source;
1224 FILE_UNIX_BASIC_INFO *info_buf_target;
1225
1226 info_buf_source =
1227 kmalloc(2 * sizeof(FILE_UNIX_BASIC_INFO), GFP_KERNEL);
1228 if (info_buf_source != NULL) {
1229 info_buf_target = info_buf_source + 1;
1230 if (pTcon->unix_ext)
1231 rc = CIFSSMBUnixQPathInfo(xid, pTcon, fromName,
1232 info_buf_source,
1233 cifs_sb_source->local_nls,
1234 cifs_sb_source->mnt_cifs_flags &
1235 CIFS_MOUNT_MAP_SPECIAL_CHR);
1236 /* else rc is still EEXIST so will fall through to
1237 unlink the target and retry rename */
1238 if (rc == 0) {
1239 rc = CIFSSMBUnixQPathInfo(xid, pTcon, toName,
1240 info_buf_target,
1241 cifs_sb_target->local_nls,
1242 /* remap based on source sb */
1243 cifs_sb_source->mnt_cifs_flags &
1244 CIFS_MOUNT_MAP_SPECIAL_CHR);
1245 }
1246 if ((rc == 0) &&
1247 (info_buf_source->UniqueId ==
1248 info_buf_target->UniqueId)) {
1249 /* do not rename since the files are hardlinked which
1250 is a noop */
1251 } else {
1252 /* we either can not tell the files are hardlinked
1253 (as with Windows servers) or files are not
1254 hardlinked so delete the target manually before
1255 renaming to follow POSIX rather than Windows
1256 semantics */
1257 cifs_unlink(target_inode, target_direntry);
1258 rc = CIFSSMBRename(xid, pTcon, fromName,
1259 toName,
1260 cifs_sb_source->local_nls,
1261 cifs_sb_source->mnt_cifs_flags
1262 & CIFS_MOUNT_MAP_SPECIAL_CHR);
1263 }
1264 kfree(info_buf_source);
1265 } /* if we can not get memory just leave rc as EEXIST */
1266 }
1267
1268 if (rc)
1269 cFYI(1, ("rename rc %d", rc));
1270
1271 if ((rc == -EIO) || (rc == -EEXIST)) {
1272 int oplock = 0;
1273 __u16 netfid;
1274
1275 /* BB FIXME Is Generic Read correct for rename? */
1276 /* if renaming directory - we should not say CREATE_NOT_DIR,
1277 need to test renaming open directory, also GENERIC_READ
1278 might not right be right access to request */
1279 rc = CIFSSMBOpen(xid, pTcon, fromName, FILE_OPEN, GENERIC_READ,
1280 CREATE_NOT_DIR, &netfid, &oplock, NULL,
1281 cifs_sb_source->local_nls,
1282 cifs_sb_source->mnt_cifs_flags &
1283 CIFS_MOUNT_MAP_SPECIAL_CHR);
1284 if (rc == 0) {
1285 rc = CIFSSMBRenameOpenFile(xid, pTcon, netfid, toName,
1286 cifs_sb_source->local_nls,
1287 cifs_sb_source->mnt_cifs_flags &
1288 CIFS_MOUNT_MAP_SPECIAL_CHR);
1289 CIFSSMBClose(xid, pTcon, netfid);
1290 }
1291 }
1292
1293 cifs_rename_exit:
1294 kfree(fromName);
1295 kfree(toName);
1296 FreeXid(xid);
1297 return rc;
1298 }
1299
1300 int cifs_revalidate(struct dentry *direntry)
1301 {
1302 int xid;
1303 int rc = 0, wbrc = 0;
1304 char *full_path;
1305 struct cifs_sb_info *cifs_sb;
1306 struct cifsInodeInfo *cifsInode;
1307 loff_t local_size;
1308 struct timespec local_mtime;
1309 bool invalidate_inode = false;
1310
1311 if (direntry->d_inode == NULL)
1312 return -ENOENT;
1313
1314 cifsInode = CIFS_I(direntry->d_inode);
1315
1316 if (cifsInode == NULL)
1317 return -ENOENT;
1318
1319 /* no sense revalidating inode info on file that no one can write */
1320 if (CIFS_I(direntry->d_inode)->clientCanCacheRead)
1321 return rc;
1322
1323 xid = GetXid();
1324
1325 cifs_sb = CIFS_SB(direntry->d_sb);
1326
1327 /* can not safely grab the rename sem here if rename calls revalidate
1328 since that would deadlock */
1329 full_path = build_path_from_dentry(direntry);
1330 if (full_path == NULL) {
1331 FreeXid(xid);
1332 return -ENOMEM;
1333 }
1334 cFYI(1, ("Revalidate: %s inode 0x%p count %d dentry: 0x%p d_time %ld "
1335 "jiffies %ld", full_path, direntry->d_inode,
1336 direntry->d_inode->i_count.counter, direntry,
1337 direntry->d_time, jiffies));
1338
1339 if (cifsInode->time == 0) {
1340 /* was set to zero previously to force revalidate */
1341 } else if (time_before(jiffies, cifsInode->time + HZ) &&
1342 lookupCacheEnabled) {
1343 if ((S_ISREG(direntry->d_inode->i_mode) == 0) ||
1344 (direntry->d_inode->i_nlink == 1)) {
1345 kfree(full_path);
1346 FreeXid(xid);
1347 return rc;
1348 } else {
1349 cFYI(1, ("Have to revalidate file due to hardlinks"));
1350 }
1351 }
1352
1353 /* save mtime and size */
1354 local_mtime = direntry->d_inode->i_mtime;
1355 local_size = direntry->d_inode->i_size;
1356
1357 if (cifs_sb->tcon->unix_ext) {
1358 rc = cifs_get_inode_info_unix(&direntry->d_inode, full_path,
1359 direntry->d_sb, xid);
1360 if (rc) {
1361 cFYI(1, ("error on getting revalidate info %d", rc));
1362 /* if (rc != -ENOENT)
1363 rc = 0; */ /* BB should we cache info on
1364 certain errors? */
1365 }
1366 } else {
1367 rc = cifs_get_inode_info(&direntry->d_inode, full_path, NULL,
1368 direntry->d_sb, xid, NULL);
1369 if (rc) {
1370 cFYI(1, ("error on getting revalidate info %d", rc));
1371 /* if (rc != -ENOENT)
1372 rc = 0; */ /* BB should we cache info on
1373 certain errors? */
1374 }
1375 }
1376 /* should we remap certain errors, access denied?, to zero */
1377
1378 /* if not oplocked, we invalidate inode pages if mtime or file size
1379 had changed on server */
1380
1381 if (timespec_equal(&local_mtime, &direntry->d_inode->i_mtime) &&
1382 (local_size == direntry->d_inode->i_size)) {
1383 cFYI(1, ("cifs_revalidate - inode unchanged"));
1384 } else {
1385 /* file may have changed on server */
1386 if (cifsInode->clientCanCacheRead) {
1387 /* no need to invalidate inode pages since we were the
1388 only ones who could have modified the file and the
1389 server copy is staler than ours */
1390 } else {
1391 invalidate_inode = true;
1392 }
1393 }
1394
1395 /* can not grab this sem since kernel filesys locking documentation
1396 indicates i_mutex may be taken by the kernel on lookup and rename
1397 which could deadlock if we grab the i_mutex here as well */
1398 /* mutex_lock(&direntry->d_inode->i_mutex);*/
1399 /* need to write out dirty pages here */
1400 if (direntry->d_inode->i_mapping) {
1401 /* do we need to lock inode until after invalidate completes
1402 below? */
1403 wbrc = filemap_fdatawrite(direntry->d_inode->i_mapping);
1404 if (wbrc)
1405 CIFS_I(direntry->d_inode)->write_behind_rc = wbrc;
1406 }
1407 if (invalidate_inode) {
1408 /* shrink_dcache not necessary now that cifs dentry ops
1409 are exported for negative dentries */
1410 /* if (S_ISDIR(direntry->d_inode->i_mode))
1411 shrink_dcache_parent(direntry); */
1412 if (S_ISREG(direntry->d_inode->i_mode)) {
1413 if (direntry->d_inode->i_mapping) {
1414 wbrc = filemap_fdatawait(direntry->d_inode->i_mapping);
1415 if (wbrc)
1416 CIFS_I(direntry->d_inode)->write_behind_rc = wbrc;
1417 }
1418 /* may eventually have to do this for open files too */
1419 if (list_empty(&(cifsInode->openFileList))) {
1420 /* changed on server - flush read ahead pages */
1421 cFYI(1, ("Invalidating read ahead data on "
1422 "closed file"));
1423 invalidate_remote_inode(direntry->d_inode);
1424 }
1425 }
1426 }
1427 /* mutex_unlock(&direntry->d_inode->i_mutex); */
1428
1429 kfree(full_path);
1430 FreeXid(xid);
1431 return rc;
1432 }
1433
1434 int cifs_getattr(struct vfsmount *mnt, struct dentry *dentry,
1435 struct kstat *stat)
1436 {
1437 int err = cifs_revalidate(dentry);
1438 if (!err) {
1439 generic_fillattr(dentry->d_inode, stat);
1440 stat->blksize = CIFS_MAX_MSGSIZE;
1441 }
1442 return err;
1443 }
1444
1445 static int cifs_truncate_page(struct address_space *mapping, loff_t from)
1446 {
1447 pgoff_t index = from >> PAGE_CACHE_SHIFT;
1448 unsigned offset = from & (PAGE_CACHE_SIZE - 1);
1449 struct page *page;
1450 int rc = 0;
1451
1452 page = grab_cache_page(mapping, index);
1453 if (!page)
1454 return -ENOMEM;
1455
1456 zero_user_segment(page, offset, PAGE_CACHE_SIZE);
1457 unlock_page(page);
1458 page_cache_release(page);
1459 return rc;
1460 }
1461
1462 static int cifs_vmtruncate(struct inode *inode, loff_t offset)
1463 {
1464 struct address_space *mapping = inode->i_mapping;
1465 unsigned long limit;
1466
1467 spin_lock(&inode->i_lock);
1468 if (inode->i_size < offset)
1469 goto do_expand;
1470 /*
1471 * truncation of in-use swapfiles is disallowed - it would cause
1472 * subsequent swapout to scribble on the now-freed blocks.
1473 */
1474 if (IS_SWAPFILE(inode)) {
1475 spin_unlock(&inode->i_lock);
1476 goto out_busy;
1477 }
1478 i_size_write(inode, offset);
1479 spin_unlock(&inode->i_lock);
1480 /*
1481 * unmap_mapping_range is called twice, first simply for efficiency
1482 * so that truncate_inode_pages does fewer single-page unmaps. However
1483 * after this first call, and before truncate_inode_pages finishes,
1484 * it is possible for private pages to be COWed, which remain after
1485 * truncate_inode_pages finishes, hence the second unmap_mapping_range
1486 * call must be made for correctness.
1487 */
1488 unmap_mapping_range(mapping, offset + PAGE_SIZE - 1, 0, 1);
1489 truncate_inode_pages(mapping, offset);
1490 unmap_mapping_range(mapping, offset + PAGE_SIZE - 1, 0, 1);
1491 goto out_truncate;
1492
1493 do_expand:
1494 limit = current->signal->rlim[RLIMIT_FSIZE].rlim_cur;
1495 if (limit != RLIM_INFINITY && offset > limit) {
1496 spin_unlock(&inode->i_lock);
1497 goto out_sig;
1498 }
1499 if (offset > inode->i_sb->s_maxbytes) {
1500 spin_unlock(&inode->i_lock);
1501 goto out_big;
1502 }
1503 i_size_write(inode, offset);
1504 spin_unlock(&inode->i_lock);
1505 out_truncate:
1506 if (inode->i_op && inode->i_op->truncate)
1507 inode->i_op->truncate(inode);
1508 return 0;
1509 out_sig:
1510 send_sig(SIGXFSZ, current, 0);
1511 out_big:
1512 return -EFBIG;
1513 out_busy:
1514 return -ETXTBSY;
1515 }
1516
1517 static int
1518 cifs_set_file_size(struct inode *inode, struct iattr *attrs,
1519 int xid, char *full_path)
1520 {
1521 int rc;
1522 struct cifsFileInfo *open_file;
1523 struct cifsInodeInfo *cifsInode = CIFS_I(inode);
1524 struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
1525 struct cifsTconInfo *pTcon = cifs_sb->tcon;
1526
1527 /*
1528 * To avoid spurious oplock breaks from server, in the case of
1529 * inodes that we already have open, avoid doing path based
1530 * setting of file size if we can do it by handle.
1531 * This keeps our caching token (oplock) and avoids timeouts
1532 * when the local oplock break takes longer to flush
1533 * writebehind data than the SMB timeout for the SetPathInfo
1534 * request would allow
1535 */
1536 open_file = find_writable_file(cifsInode);
1537 if (open_file) {
1538 __u16 nfid = open_file->netfid;
1539 __u32 npid = open_file->pid;
1540 rc = CIFSSMBSetFileSize(xid, pTcon, attrs->ia_size, nfid,
1541 npid, false);
1542 atomic_dec(&open_file->wrtPending);
1543 cFYI(1, ("SetFSize for attrs rc = %d", rc));
1544 if ((rc == -EINVAL) || (rc == -EOPNOTSUPP)) {
1545 unsigned int bytes_written;
1546 rc = CIFSSMBWrite(xid, pTcon, nfid, 0, attrs->ia_size,
1547 &bytes_written, NULL, NULL, 1);
1548 cFYI(1, ("Wrt seteof rc %d", rc));
1549 }
1550 } else
1551 rc = -EINVAL;
1552
1553 if (rc != 0) {
1554 /* Set file size by pathname rather than by handle
1555 either because no valid, writeable file handle for
1556 it was found or because there was an error setting
1557 it by handle */
1558 rc = CIFSSMBSetEOF(xid, pTcon, full_path, attrs->ia_size,
1559 false, cifs_sb->local_nls,
1560 cifs_sb->mnt_cifs_flags &
1561 CIFS_MOUNT_MAP_SPECIAL_CHR);
1562 cFYI(1, ("SetEOF by path (setattrs) rc = %d", rc));
1563 if ((rc == -EINVAL) || (rc == -EOPNOTSUPP)) {
1564 __u16 netfid;
1565 int oplock = 0;
1566
1567 rc = SMBLegacyOpen(xid, pTcon, full_path,
1568 FILE_OPEN, GENERIC_WRITE,
1569 CREATE_NOT_DIR, &netfid, &oplock, NULL,
1570 cifs_sb->local_nls,
1571 cifs_sb->mnt_cifs_flags &
1572 CIFS_MOUNT_MAP_SPECIAL_CHR);
1573 if (rc == 0) {
1574 unsigned int bytes_written;
1575 rc = CIFSSMBWrite(xid, pTcon, netfid, 0,
1576 attrs->ia_size,
1577 &bytes_written, NULL,
1578 NULL, 1);
1579 cFYI(1, ("wrt seteof rc %d", rc));
1580 CIFSSMBClose(xid, pTcon, netfid);
1581 }
1582 }
1583 }
1584
1585 if (rc == 0) {
1586 rc = cifs_vmtruncate(inode, attrs->ia_size);
1587 cifs_truncate_page(inode->i_mapping, inode->i_size);
1588 }
1589
1590 return rc;
1591 }
1592
1593 static int
1594 cifs_setattr_unix(struct dentry *direntry, struct iattr *attrs)
1595 {
1596 int rc;
1597 int xid;
1598 char *full_path = NULL;
1599 struct inode *inode = direntry->d_inode;
1600 struct cifsInodeInfo *cifsInode = CIFS_I(inode);
1601 struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
1602 struct cifsTconInfo *pTcon = cifs_sb->tcon;
1603 struct cifs_unix_set_info_args *args = NULL;
1604
1605 cFYI(1, ("setattr_unix on file %s attrs->ia_valid=0x%x",
1606 direntry->d_name.name, attrs->ia_valid));
1607
1608 xid = GetXid();
1609
1610 if ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_PERM) == 0) {
1611 /* check if we have permission to change attrs */
1612 rc = inode_change_ok(inode, attrs);
1613 if (rc < 0)
1614 goto out;
1615 else
1616 rc = 0;
1617 }
1618
1619 full_path = build_path_from_dentry(direntry);
1620 if (full_path == NULL) {
1621 rc = -ENOMEM;
1622 goto out;
1623 }
1624
1625 if ((attrs->ia_valid & ATTR_MTIME) || (attrs->ia_valid & ATTR_SIZE)) {
1626 /*
1627 Flush data before changing file size or changing the last
1628 write time of the file on the server. If the
1629 flush returns error, store it to report later and continue.
1630 BB: This should be smarter. Why bother flushing pages that
1631 will be truncated anyway? Also, should we error out here if
1632 the flush returns error?
1633 */
1634 rc = filemap_write_and_wait(inode->i_mapping);
1635 if (rc != 0) {
1636 cifsInode->write_behind_rc = rc;
1637 rc = 0;
1638 }
1639 }
1640
1641 if (attrs->ia_valid & ATTR_SIZE) {
1642 rc = cifs_set_file_size(inode, attrs, xid, full_path);
1643 if (rc != 0)
1644 goto out;
1645 }
1646
1647 /* skip mode change if it's just for clearing setuid/setgid */
1648 if (attrs->ia_valid & (ATTR_KILL_SUID|ATTR_KILL_SGID))
1649 attrs->ia_valid &= ~ATTR_MODE;
1650
1651 args = kmalloc(sizeof(*args), GFP_KERNEL);
1652 if (args == NULL) {
1653 rc = -ENOMEM;
1654 goto out;
1655 }
1656
1657 /* set up the struct */
1658 if (attrs->ia_valid & ATTR_MODE)
1659 args->mode = attrs->ia_mode;
1660 else
1661 args->mode = NO_CHANGE_64;
1662
1663 if (attrs->ia_valid & ATTR_UID)
1664 args->uid = attrs->ia_uid;
1665 else
1666 args->uid = NO_CHANGE_64;
1667
1668 if (attrs->ia_valid & ATTR_GID)
1669 args->gid = attrs->ia_gid;
1670 else
1671 args->gid = NO_CHANGE_64;
1672
1673 if (attrs->ia_valid & ATTR_ATIME)
1674 args->atime = cifs_UnixTimeToNT(attrs->ia_atime);
1675 else
1676 args->atime = NO_CHANGE_64;
1677
1678 if (attrs->ia_valid & ATTR_MTIME)
1679 args->mtime = cifs_UnixTimeToNT(attrs->ia_mtime);
1680 else
1681 args->mtime = NO_CHANGE_64;
1682
1683 if (attrs->ia_valid & ATTR_CTIME)
1684 args->ctime = cifs_UnixTimeToNT(attrs->ia_ctime);
1685 else
1686 args->ctime = NO_CHANGE_64;
1687
1688 args->device = 0;
1689 rc = CIFSSMBUnixSetInfo(xid, pTcon, full_path, args,
1690 cifs_sb->local_nls,
1691 cifs_sb->mnt_cifs_flags &
1692 CIFS_MOUNT_MAP_SPECIAL_CHR);
1693
1694 if (!rc)
1695 rc = inode_setattr(inode, attrs);
1696 out:
1697 kfree(args);
1698 kfree(full_path);
1699 FreeXid(xid);
1700 return rc;
1701 }
1702
1703 static int
1704 cifs_setattr_nounix(struct dentry *direntry, struct iattr *attrs)
1705 {
1706 int xid;
1707 struct inode *inode = direntry->d_inode;
1708 struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
1709 struct cifsInodeInfo *cifsInode = CIFS_I(inode);
1710 char *full_path = NULL;
1711 int rc = -EACCES;
1712 __u32 dosattr = 0;
1713 __u64 mode = NO_CHANGE_64;
1714
1715 xid = GetXid();
1716
1717 cFYI(1, ("setattr on file %s attrs->iavalid 0x%x",
1718 direntry->d_name.name, attrs->ia_valid));
1719
1720 if ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_PERM) == 0) {
1721 /* check if we have permission to change attrs */
1722 rc = inode_change_ok(inode, attrs);
1723 if (rc < 0) {
1724 FreeXid(xid);
1725 return rc;
1726 } else
1727 rc = 0;
1728 }
1729
1730 full_path = build_path_from_dentry(direntry);
1731 if (full_path == NULL) {
1732 FreeXid(xid);
1733 return -ENOMEM;
1734 }
1735
1736 if ((attrs->ia_valid & ATTR_MTIME) || (attrs->ia_valid & ATTR_SIZE)) {
1737 /*
1738 Flush data before changing file size or changing the last
1739 write time of the file on the server. If the
1740 flush returns error, store it to report later and continue.
1741 BB: This should be smarter. Why bother flushing pages that
1742 will be truncated anyway? Also, should we error out here if
1743 the flush returns error?
1744 */
1745 rc = filemap_write_and_wait(inode->i_mapping);
1746 if (rc != 0) {
1747 cifsInode->write_behind_rc = rc;
1748 rc = 0;
1749 }
1750 }
1751
1752 if (attrs->ia_valid & ATTR_SIZE) {
1753 rc = cifs_set_file_size(inode, attrs, xid, full_path);
1754 if (rc != 0)
1755 goto cifs_setattr_exit;
1756 }
1757
1758 /*
1759 * Without unix extensions we can't send ownership changes to the
1760 * server, so silently ignore them. This is consistent with how
1761 * local DOS/Windows filesystems behave (VFAT, NTFS, etc). With
1762 * CIFSACL support + proper Windows to Unix idmapping, we may be
1763 * able to support this in the future.
1764 */
1765 if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SET_UID))
1766 attrs->ia_valid &= ~(ATTR_UID | ATTR_GID);
1767
1768 /* skip mode change if it's just for clearing setuid/setgid */
1769 if (attrs->ia_valid & (ATTR_KILL_SUID|ATTR_KILL_SGID))
1770 attrs->ia_valid &= ~ATTR_MODE;
1771
1772 if (attrs->ia_valid & ATTR_MODE) {
1773 cFYI(1, ("Mode changed to 0%o", attrs->ia_mode));
1774 mode = attrs->ia_mode;
1775 }
1776
1777 if (attrs->ia_valid & ATTR_MODE) {
1778 rc = 0;
1779 #ifdef CONFIG_CIFS_EXPERIMENTAL
1780 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_CIFS_ACL)
1781 rc = mode_to_acl(inode, full_path, mode);
1782 else
1783 #endif
1784 if (((mode & S_IWUGO) == 0) &&
1785 (cifsInode->cifsAttrs & ATTR_READONLY) == 0) {
1786
1787 dosattr = cifsInode->cifsAttrs | ATTR_READONLY;
1788
1789 /* fix up mode if we're not using dynperm */
1790 if ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DYNPERM) == 0)
1791 attrs->ia_mode = inode->i_mode & ~S_IWUGO;
1792 } else if ((mode & S_IWUGO) &&
1793 (cifsInode->cifsAttrs & ATTR_READONLY)) {
1794
1795 dosattr = cifsInode->cifsAttrs & ~ATTR_READONLY;
1796 /* Attributes of 0 are ignored */
1797 if (dosattr == 0)
1798 dosattr |= ATTR_NORMAL;
1799
1800 /* reset local inode permissions to normal */
1801 if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DYNPERM)) {
1802 attrs->ia_mode &= ~(S_IALLUGO);
1803 if (S_ISDIR(inode->i_mode))
1804 attrs->ia_mode |=
1805 cifs_sb->mnt_dir_mode;
1806 else
1807 attrs->ia_mode |=
1808 cifs_sb->mnt_file_mode;
1809 }
1810 } else if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DYNPERM)) {
1811 /* ignore mode change - ATTR_READONLY hasn't changed */
1812 attrs->ia_valid &= ~ATTR_MODE;
1813 }
1814 }
1815
1816 if (attrs->ia_valid & (ATTR_MTIME|ATTR_ATIME|ATTR_CTIME) ||
1817 ((attrs->ia_valid & ATTR_MODE) && dosattr)) {
1818 rc = cifs_set_file_info(inode, attrs, xid, full_path, dosattr);
1819 /* BB: check for rc = -EOPNOTSUPP and switch to legacy mode */
1820
1821 /* Even if error on time set, no sense failing the call if
1822 the server would set the time to a reasonable value anyway,
1823 and this check ensures that we are not being called from
1824 sys_utimes in which case we ought to fail the call back to
1825 the user when the server rejects the call */
1826 if ((rc) && (attrs->ia_valid &
1827 (ATTR_MODE | ATTR_GID | ATTR_UID | ATTR_SIZE)))
1828 rc = 0;
1829 }
1830
1831 /* do not need local check to inode_check_ok since the server does
1832 that */
1833 if (!rc)
1834 rc = inode_setattr(inode, attrs);
1835 cifs_setattr_exit:
1836 kfree(full_path);
1837 FreeXid(xid);
1838 return rc;
1839 }
1840
1841 int
1842 cifs_setattr(struct dentry *direntry, struct iattr *attrs)
1843 {
1844 struct inode *inode = direntry->d_inode;
1845 struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
1846 struct cifsTconInfo *pTcon = cifs_sb->tcon;
1847
1848 if (pTcon->unix_ext)
1849 return cifs_setattr_unix(direntry, attrs);
1850
1851 return cifs_setattr_nounix(direntry, attrs);
1852
1853 /* BB: add cifs_setattr_legacy for really old servers */
1854 }
1855
1856 #if 0
1857 void cifs_delete_inode(struct inode *inode)
1858 {
1859 cFYI(1, ("In cifs_delete_inode, inode = 0x%p", inode));
1860 /* may have to add back in if and when safe distributed caching of
1861 directories added e.g. via FindNotify */
1862 }
1863 #endif
ubuntu-zesty-kernel mirror