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[CIFS] cifs_mkdir and cifs_create should respect the setgid bit on parent dir
[GitHub/mt8127/android_kernel_alcatel_ttab.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 inode->i_mode &= ~S_IFMT;
550 }
551 /* clear write bits if ATTR_READONLY is set */
552 if (attr & ATTR_READONLY)
553 inode->i_mode &= ~S_IWUGO;
554
555 /* set inode type */
556 if ((attr & ATTR_SYSTEM) &&
557 (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_UNX_EMUL)) {
558 /* no need to fix endianness on 0 */
559 if (pfindData->EndOfFile == 0)
560 inode->i_mode |= S_IFIFO;
561 else if (decode_sfu_inode(inode,
562 le64_to_cpu(pfindData->EndOfFile),
563 full_path, cifs_sb, xid))
564 cFYI(1, ("unknown SFU file type\n"));
565 } else {
566 if (attr & ATTR_DIRECTORY)
567 inode->i_mode |= S_IFDIR;
568 else
569 inode->i_mode |= S_IFREG;
570 }
571
572 spin_lock(&inode->i_lock);
573 if (is_size_safe_to_change(cifsInfo,
574 le64_to_cpu(pfindData->EndOfFile))) {
575 /* can not safely shrink the file size here if the
576 client is writing to it due to potential races */
577 i_size_write(inode, le64_to_cpu(pfindData->EndOfFile));
578
579 /* 512 bytes (2**9) is the fake blocksize that must be
580 used for this calculation */
581 inode->i_blocks = (512 - 1 + le64_to_cpu(
582 pfindData->AllocationSize)) >> 9;
583 }
584 spin_unlock(&inode->i_lock);
585
586 inode->i_nlink = le32_to_cpu(pfindData->NumberOfLinks);
587
588 /* BB fill in uid and gid here? with help from winbind?
589 or retrieve from NTFS stream extended attribute */
590 #ifdef CONFIG_CIFS_EXPERIMENTAL
591 /* fill in 0777 bits from ACL */
592 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_CIFS_ACL) {
593 cFYI(1, ("Getting mode bits from ACL"));
594 acl_to_uid_mode(inode, full_path, pfid);
595 }
596 #endif
597 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_UNX_EMUL) {
598 /* fill in remaining high mode bits e.g. SUID, VTX */
599 get_sfu_mode(inode, full_path, cifs_sb, xid);
600 } else if (atomic_read(&cifsInfo->inUse) == 0) {
601 inode->i_uid = cifs_sb->mnt_uid;
602 inode->i_gid = cifs_sb->mnt_gid;
603 /* set so we do not keep refreshing these fields with
604 bad data after user has changed them in memory */
605 atomic_set(&cifsInfo->inUse, 1);
606 }
607
608 cifs_set_ops(inode, is_dfs_referral);
609
610
611
612
613 cgii_exit:
614 kfree(buf);
615 return rc;
616 }
617
618 static const struct inode_operations cifs_ipc_inode_ops = {
619 .lookup = cifs_lookup,
620 };
621
622 /* gets root inode */
623 struct inode *cifs_iget(struct super_block *sb, unsigned long ino)
624 {
625 int xid;
626 struct cifs_sb_info *cifs_sb;
627 struct inode *inode;
628 long rc;
629
630 inode = iget_locked(sb, ino);
631 if (!inode)
632 return ERR_PTR(-ENOMEM);
633 if (!(inode->i_state & I_NEW))
634 return inode;
635
636 cifs_sb = CIFS_SB(inode->i_sb);
637 xid = GetXid();
638
639 if (cifs_sb->tcon->unix_ext)
640 rc = cifs_get_inode_info_unix(&inode, "", inode->i_sb, xid);
641 else
642 rc = cifs_get_inode_info(&inode, "", NULL, inode->i_sb, xid,
643 NULL);
644 if (rc && cifs_sb->tcon->ipc) {
645 cFYI(1, ("ipc connection - fake read inode"));
646 inode->i_mode |= S_IFDIR;
647 inode->i_nlink = 2;
648 inode->i_op = &cifs_ipc_inode_ops;
649 inode->i_fop = &simple_dir_operations;
650 inode->i_uid = cifs_sb->mnt_uid;
651 inode->i_gid = cifs_sb->mnt_gid;
652 _FreeXid(xid);
653 iget_failed(inode);
654 return ERR_PTR(rc);
655 }
656
657 unlock_new_inode(inode);
658
659 /* can not call macro FreeXid here since in a void func
660 * TODO: This is no longer true
661 */
662 _FreeXid(xid);
663 return inode;
664 }
665
666 int cifs_unlink(struct inode *inode, struct dentry *direntry)
667 {
668 int rc = 0;
669 int xid;
670 struct cifs_sb_info *cifs_sb;
671 struct cifsTconInfo *pTcon;
672 char *full_path = NULL;
673 struct cifsInodeInfo *cifsInode;
674 FILE_BASIC_INFO *pinfo_buf;
675
676 cFYI(1, ("cifs_unlink, inode = 0x%p", inode));
677
678 xid = GetXid();
679
680 if (inode)
681 cifs_sb = CIFS_SB(inode->i_sb);
682 else
683 cifs_sb = CIFS_SB(direntry->d_sb);
684 pTcon = cifs_sb->tcon;
685
686 /* Unlink can be called from rename so we can not grab the sem here
687 since we deadlock otherwise */
688 /* mutex_lock(&direntry->d_sb->s_vfs_rename_mutex);*/
689 full_path = build_path_from_dentry(direntry);
690 /* mutex_unlock(&direntry->d_sb->s_vfs_rename_mutex);*/
691 if (full_path == NULL) {
692 FreeXid(xid);
693 return -ENOMEM;
694 }
695
696 if ((pTcon->ses->capabilities & CAP_UNIX) &&
697 (CIFS_UNIX_POSIX_PATH_OPS_CAP &
698 le64_to_cpu(pTcon->fsUnixInfo.Capability))) {
699 rc = CIFSPOSIXDelFile(xid, pTcon, full_path,
700 SMB_POSIX_UNLINK_FILE_TARGET, cifs_sb->local_nls,
701 cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR);
702 cFYI(1, ("posix del rc %d", rc));
703 if ((rc == 0) || (rc == -ENOENT))
704 goto psx_del_no_retry;
705 }
706
707 rc = CIFSSMBDelFile(xid, pTcon, full_path, cifs_sb->local_nls,
708 cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR);
709 psx_del_no_retry:
710 if (!rc) {
711 if (direntry->d_inode)
712 drop_nlink(direntry->d_inode);
713 } else if (rc == -ENOENT) {
714 d_drop(direntry);
715 } else if (rc == -ETXTBSY) {
716 int oplock = 0;
717 __u16 netfid;
718
719 rc = CIFSSMBOpen(xid, pTcon, full_path, FILE_OPEN, DELETE,
720 CREATE_NOT_DIR | CREATE_DELETE_ON_CLOSE,
721 &netfid, &oplock, NULL, cifs_sb->local_nls,
722 cifs_sb->mnt_cifs_flags &
723 CIFS_MOUNT_MAP_SPECIAL_CHR);
724 if (rc == 0) {
725 CIFSSMBRenameOpenFile(xid, pTcon, netfid, NULL,
726 cifs_sb->local_nls,
727 cifs_sb->mnt_cifs_flags &
728 CIFS_MOUNT_MAP_SPECIAL_CHR);
729 CIFSSMBClose(xid, pTcon, netfid);
730 if (direntry->d_inode)
731 drop_nlink(direntry->d_inode);
732 }
733 } else if (rc == -EACCES) {
734 /* try only if r/o attribute set in local lookup data? */
735 pinfo_buf = kzalloc(sizeof(FILE_BASIC_INFO), GFP_KERNEL);
736 if (pinfo_buf) {
737 /* ATTRS set to normal clears r/o bit */
738 pinfo_buf->Attributes = cpu_to_le32(ATTR_NORMAL);
739 if (!(pTcon->ses->flags & CIFS_SES_NT4))
740 rc = CIFSSMBSetPathInfo(xid, pTcon, full_path,
741 pinfo_buf,
742 cifs_sb->local_nls,
743 cifs_sb->mnt_cifs_flags &
744 CIFS_MOUNT_MAP_SPECIAL_CHR);
745 else
746 rc = -EOPNOTSUPP;
747
748 if (rc == -EOPNOTSUPP) {
749 int oplock = 0;
750 __u16 netfid;
751 /* rc = CIFSSMBSetAttrLegacy(xid, pTcon,
752 full_path,
753 (__u16)ATTR_NORMAL,
754 cifs_sb->local_nls);
755 For some strange reason it seems that NT4 eats the
756 old setattr call without actually setting the
757 attributes so on to the third attempted workaround
758 */
759
760 /* BB could scan to see if we already have it open
761 and pass in pid of opener to function */
762 rc = CIFSSMBOpen(xid, pTcon, full_path,
763 FILE_OPEN, SYNCHRONIZE |
764 FILE_WRITE_ATTRIBUTES, 0,
765 &netfid, &oplock, NULL,
766 cifs_sb->local_nls,
767 cifs_sb->mnt_cifs_flags &
768 CIFS_MOUNT_MAP_SPECIAL_CHR);
769 if (rc == 0) {
770 rc = CIFSSMBSetFileInfo(xid, pTcon,
771 pinfo_buf,
772 netfid,
773 current->tgid);
774 CIFSSMBClose(xid, pTcon, netfid);
775 }
776 }
777 kfree(pinfo_buf);
778 }
779 if (rc == 0) {
780 rc = CIFSSMBDelFile(xid, pTcon, full_path,
781 cifs_sb->local_nls,
782 cifs_sb->mnt_cifs_flags &
783 CIFS_MOUNT_MAP_SPECIAL_CHR);
784 if (!rc) {
785 if (direntry->d_inode)
786 drop_nlink(direntry->d_inode);
787 } else if (rc == -ETXTBSY) {
788 int oplock = 0;
789 __u16 netfid;
790
791 rc = CIFSSMBOpen(xid, pTcon, full_path,
792 FILE_OPEN, DELETE,
793 CREATE_NOT_DIR |
794 CREATE_DELETE_ON_CLOSE,
795 &netfid, &oplock, NULL,
796 cifs_sb->local_nls,
797 cifs_sb->mnt_cifs_flags &
798 CIFS_MOUNT_MAP_SPECIAL_CHR);
799 if (rc == 0) {
800 CIFSSMBRenameOpenFile(xid, pTcon,
801 netfid, NULL,
802 cifs_sb->local_nls,
803 cifs_sb->mnt_cifs_flags &
804 CIFS_MOUNT_MAP_SPECIAL_CHR);
805 CIFSSMBClose(xid, pTcon, netfid);
806 if (direntry->d_inode)
807 drop_nlink(direntry->d_inode);
808 }
809 /* BB if rc = -ETXTBUSY goto the rename logic BB */
810 }
811 }
812 }
813 if (direntry->d_inode) {
814 cifsInode = CIFS_I(direntry->d_inode);
815 cifsInode->time = 0; /* will force revalidate to get info
816 when needed */
817 direntry->d_inode->i_ctime = current_fs_time(inode->i_sb);
818 }
819 if (inode) {
820 inode->i_ctime = inode->i_mtime = current_fs_time(inode->i_sb);
821 cifsInode = CIFS_I(inode);
822 cifsInode->time = 0; /* force revalidate of dir as well */
823 }
824
825 kfree(full_path);
826 FreeXid(xid);
827 return rc;
828 }
829
830 static void posix_fill_in_inode(struct inode *tmp_inode,
831 FILE_UNIX_BASIC_INFO *pData, int isNewInode)
832 {
833 struct cifsInodeInfo *cifsInfo = CIFS_I(tmp_inode);
834 loff_t local_size;
835 struct timespec local_mtime;
836
837 cifsInfo->time = jiffies;
838 atomic_inc(&cifsInfo->inUse);
839
840 /* save mtime and size */
841 local_mtime = tmp_inode->i_mtime;
842 local_size = tmp_inode->i_size;
843
844 cifs_unix_info_to_inode(tmp_inode, pData, 1);
845 cifs_set_ops(tmp_inode, false);
846
847 if (!S_ISREG(tmp_inode->i_mode))
848 return;
849
850 /*
851 * No sense invalidating pages for new inode
852 * since we we have not started caching
853 * readahead file data yet.
854 */
855 if (isNewInode)
856 return;
857
858 if (timespec_equal(&tmp_inode->i_mtime, &local_mtime) &&
859 (local_size == tmp_inode->i_size)) {
860 cFYI(1, ("inode exists but unchanged"));
861 } else {
862 /* file may have changed on server */
863 cFYI(1, ("invalidate inode, readdir detected change"));
864 invalidate_remote_inode(tmp_inode);
865 }
866 }
867
868 int cifs_mkdir(struct inode *inode, struct dentry *direntry, int mode)
869 {
870 int rc = 0;
871 int xid;
872 struct cifs_sb_info *cifs_sb;
873 struct cifsTconInfo *pTcon;
874 char *full_path = NULL;
875 struct inode *newinode = NULL;
876
877 cFYI(1, ("In cifs_mkdir, mode = 0x%x inode = 0x%p", mode, inode));
878
879 xid = GetXid();
880
881 cifs_sb = CIFS_SB(inode->i_sb);
882 pTcon = cifs_sb->tcon;
883
884 full_path = build_path_from_dentry(direntry);
885 if (full_path == NULL) {
886 FreeXid(xid);
887 return -ENOMEM;
888 }
889
890 if ((pTcon->ses->capabilities & CAP_UNIX) &&
891 (CIFS_UNIX_POSIX_PATH_OPS_CAP &
892 le64_to_cpu(pTcon->fsUnixInfo.Capability))) {
893 u32 oplock = 0;
894 FILE_UNIX_BASIC_INFO *pInfo =
895 kzalloc(sizeof(FILE_UNIX_BASIC_INFO), GFP_KERNEL);
896 if (pInfo == NULL) {
897 rc = -ENOMEM;
898 goto mkdir_out;
899 }
900
901 mode &= ~current->fs->umask;
902 rc = CIFSPOSIXCreate(xid, pTcon, SMB_O_DIRECTORY | SMB_O_CREAT,
903 mode, NULL /* netfid */, pInfo, &oplock,
904 full_path, cifs_sb->local_nls,
905 cifs_sb->mnt_cifs_flags &
906 CIFS_MOUNT_MAP_SPECIAL_CHR);
907 if (rc == -EOPNOTSUPP) {
908 kfree(pInfo);
909 goto mkdir_retry_old;
910 } else if (rc) {
911 cFYI(1, ("posix mkdir returned 0x%x", rc));
912 d_drop(direntry);
913 } else {
914 if (pInfo->Type == cpu_to_le32(-1)) {
915 /* no return info, go query for it */
916 kfree(pInfo);
917 goto mkdir_get_info;
918 }
919 /*BB check (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SET_UID ) to see if need
920 to set uid/gid */
921 inc_nlink(inode);
922 if (pTcon->nocase)
923 direntry->d_op = &cifs_ci_dentry_ops;
924 else
925 direntry->d_op = &cifs_dentry_ops;
926
927 newinode = new_inode(inode->i_sb);
928 if (newinode == NULL) {
929 kfree(pInfo);
930 goto mkdir_get_info;
931 }
932 /* Is an i_ino of zero legal? */
933 /* Are there sanity checks we can use to ensure that
934 the server is really filling in that field? */
935 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM) {
936 newinode->i_ino =
937 (unsigned long)pInfo->UniqueId;
938 } /* note ino incremented to unique num in new_inode */
939 if (inode->i_sb->s_flags & MS_NOATIME)
940 newinode->i_flags |= S_NOATIME | S_NOCMTIME;
941 newinode->i_nlink = 2;
942
943 insert_inode_hash(newinode);
944 d_instantiate(direntry, newinode);
945
946 /* we already checked in POSIXCreate whether
947 frame was long enough */
948 posix_fill_in_inode(direntry->d_inode,
949 pInfo, 1 /* NewInode */);
950 #ifdef CONFIG_CIFS_DEBUG2
951 cFYI(1, ("instantiated dentry %p %s to inode %p",
952 direntry, direntry->d_name.name, newinode));
953
954 if (newinode->i_nlink != 2)
955 cFYI(1, ("unexpected number of links %d",
956 newinode->i_nlink));
957 #endif
958 }
959 kfree(pInfo);
960 goto mkdir_out;
961 }
962 mkdir_retry_old:
963 /* BB add setting the equivalent of mode via CreateX w/ACLs */
964 rc = CIFSSMBMkDir(xid, pTcon, full_path, cifs_sb->local_nls,
965 cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR);
966 if (rc) {
967 cFYI(1, ("cifs_mkdir returned 0x%x", rc));
968 d_drop(direntry);
969 } else {
970 mkdir_get_info:
971 inc_nlink(inode);
972 if (pTcon->unix_ext)
973 rc = cifs_get_inode_info_unix(&newinode, full_path,
974 inode->i_sb, xid);
975 else
976 rc = cifs_get_inode_info(&newinode, full_path, NULL,
977 inode->i_sb, xid, NULL);
978
979 if (pTcon->nocase)
980 direntry->d_op = &cifs_ci_dentry_ops;
981 else
982 direntry->d_op = &cifs_dentry_ops;
983 d_instantiate(direntry, newinode);
984 /* setting nlink not necessary except in cases where we
985 * failed to get it from the server or was set bogus */
986 if ((direntry->d_inode) && (direntry->d_inode->i_nlink < 2))
987 direntry->d_inode->i_nlink = 2;
988
989 mode &= ~current->fs->umask;
990 /* must turn on setgid bit if parent dir has it */
991 if (inode->i_mode & S_ISGID)
992 mode |= S_ISGID;
993
994 if (pTcon->unix_ext) {
995 struct cifs_unix_set_info_args args = {
996 .mode = mode,
997 .ctime = NO_CHANGE_64,
998 .atime = NO_CHANGE_64,
999 .mtime = NO_CHANGE_64,
1000 .device = 0,
1001 };
1002 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SET_UID) {
1003 args.uid = (__u64)current->fsuid;
1004 if (inode->i_mode & S_ISGID)
1005 args.gid = (__u64)inode->i_gid;
1006 else
1007 args.gid = (__u64)current->fsgid;
1008 } else {
1009 args.uid = NO_CHANGE_64;
1010 args.gid = NO_CHANGE_64;
1011 }
1012 CIFSSMBUnixSetInfo(xid, pTcon, full_path, &args,
1013 cifs_sb->local_nls,
1014 cifs_sb->mnt_cifs_flags &
1015 CIFS_MOUNT_MAP_SPECIAL_CHR);
1016 } else {
1017 if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_CIFS_ACL) &&
1018 (mode & S_IWUGO) == 0) {
1019 FILE_BASIC_INFO pInfo;
1020 memset(&pInfo, 0, sizeof(pInfo));
1021 pInfo.Attributes = cpu_to_le32(ATTR_READONLY);
1022 CIFSSMBSetPathInfo(xid, pTcon, full_path,
1023 &pInfo, cifs_sb->local_nls,
1024 cifs_sb->mnt_cifs_flags &
1025 CIFS_MOUNT_MAP_SPECIAL_CHR);
1026 }
1027 if (direntry->d_inode) {
1028 if (cifs_sb->mnt_cifs_flags &
1029 CIFS_MOUNT_DYNPERM)
1030 direntry->d_inode->i_mode =
1031 (mode | S_IFDIR);
1032
1033 if (cifs_sb->mnt_cifs_flags &
1034 CIFS_MOUNT_SET_UID) {
1035 direntry->d_inode->i_uid =
1036 current->fsuid;
1037 if (inode->i_mode & S_ISGID)
1038 direntry->d_inode->i_gid =
1039 inode->i_gid;
1040 else
1041 direntry->d_inode->i_gid =
1042 current->fsgid;
1043 }
1044 }
1045 }
1046 }
1047 mkdir_out:
1048 kfree(full_path);
1049 FreeXid(xid);
1050 return rc;
1051 }
1052
1053 int cifs_rmdir(struct inode *inode, struct dentry *direntry)
1054 {
1055 int rc = 0;
1056 int xid;
1057 struct cifs_sb_info *cifs_sb;
1058 struct cifsTconInfo *pTcon;
1059 char *full_path = NULL;
1060 struct cifsInodeInfo *cifsInode;
1061
1062 cFYI(1, ("cifs_rmdir, inode = 0x%p", inode));
1063
1064 xid = GetXid();
1065
1066 cifs_sb = CIFS_SB(inode->i_sb);
1067 pTcon = cifs_sb->tcon;
1068
1069 full_path = build_path_from_dentry(direntry);
1070 if (full_path == NULL) {
1071 FreeXid(xid);
1072 return -ENOMEM;
1073 }
1074
1075 rc = CIFSSMBRmDir(xid, pTcon, full_path, cifs_sb->local_nls,
1076 cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR);
1077
1078 if (!rc) {
1079 drop_nlink(inode);
1080 spin_lock(&direntry->d_inode->i_lock);
1081 i_size_write(direntry->d_inode, 0);
1082 clear_nlink(direntry->d_inode);
1083 spin_unlock(&direntry->d_inode->i_lock);
1084 }
1085
1086 cifsInode = CIFS_I(direntry->d_inode);
1087 cifsInode->time = 0; /* force revalidate to go get info when
1088 needed */
1089 direntry->d_inode->i_ctime = inode->i_ctime = inode->i_mtime =
1090 current_fs_time(inode->i_sb);
1091
1092 kfree(full_path);
1093 FreeXid(xid);
1094 return rc;
1095 }
1096
1097 int cifs_rename(struct inode *source_inode, struct dentry *source_direntry,
1098 struct inode *target_inode, struct dentry *target_direntry)
1099 {
1100 char *fromName;
1101 char *toName;
1102 struct cifs_sb_info *cifs_sb_source;
1103 struct cifs_sb_info *cifs_sb_target;
1104 struct cifsTconInfo *pTcon;
1105 int xid;
1106 int rc = 0;
1107
1108 xid = GetXid();
1109
1110 cifs_sb_target = CIFS_SB(target_inode->i_sb);
1111 cifs_sb_source = CIFS_SB(source_inode->i_sb);
1112 pTcon = cifs_sb_source->tcon;
1113
1114 if (pTcon != cifs_sb_target->tcon) {
1115 FreeXid(xid);
1116 return -EXDEV; /* BB actually could be allowed if same server,
1117 but different share.
1118 Might eventually add support for this */
1119 }
1120
1121 /* we already have the rename sem so we do not need to grab it again
1122 here to protect the path integrity */
1123 fromName = build_path_from_dentry(source_direntry);
1124 toName = build_path_from_dentry(target_direntry);
1125 if ((fromName == NULL) || (toName == NULL)) {
1126 rc = -ENOMEM;
1127 goto cifs_rename_exit;
1128 }
1129
1130 rc = CIFSSMBRename(xid, pTcon, fromName, toName,
1131 cifs_sb_source->local_nls,
1132 cifs_sb_source->mnt_cifs_flags &
1133 CIFS_MOUNT_MAP_SPECIAL_CHR);
1134 if (rc == -EEXIST) {
1135 /* check if they are the same file because rename of hardlinked
1136 files is a noop */
1137 FILE_UNIX_BASIC_INFO *info_buf_source;
1138 FILE_UNIX_BASIC_INFO *info_buf_target;
1139
1140 info_buf_source =
1141 kmalloc(2 * sizeof(FILE_UNIX_BASIC_INFO), GFP_KERNEL);
1142 if (info_buf_source != NULL) {
1143 info_buf_target = info_buf_source + 1;
1144 if (pTcon->unix_ext)
1145 rc = CIFSSMBUnixQPathInfo(xid, pTcon, fromName,
1146 info_buf_source,
1147 cifs_sb_source->local_nls,
1148 cifs_sb_source->mnt_cifs_flags &
1149 CIFS_MOUNT_MAP_SPECIAL_CHR);
1150 /* else rc is still EEXIST so will fall through to
1151 unlink the target and retry rename */
1152 if (rc == 0) {
1153 rc = CIFSSMBUnixQPathInfo(xid, pTcon, toName,
1154 info_buf_target,
1155 cifs_sb_target->local_nls,
1156 /* remap based on source sb */
1157 cifs_sb_source->mnt_cifs_flags &
1158 CIFS_MOUNT_MAP_SPECIAL_CHR);
1159 }
1160 if ((rc == 0) &&
1161 (info_buf_source->UniqueId ==
1162 info_buf_target->UniqueId)) {
1163 /* do not rename since the files are hardlinked which
1164 is a noop */
1165 } else {
1166 /* we either can not tell the files are hardlinked
1167 (as with Windows servers) or files are not
1168 hardlinked so delete the target manually before
1169 renaming to follow POSIX rather than Windows
1170 semantics */
1171 cifs_unlink(target_inode, target_direntry);
1172 rc = CIFSSMBRename(xid, pTcon, fromName,
1173 toName,
1174 cifs_sb_source->local_nls,
1175 cifs_sb_source->mnt_cifs_flags
1176 & CIFS_MOUNT_MAP_SPECIAL_CHR);
1177 }
1178 kfree(info_buf_source);
1179 } /* if we can not get memory just leave rc as EEXIST */
1180 }
1181
1182 if (rc)
1183 cFYI(1, ("rename rc %d", rc));
1184
1185 if ((rc == -EIO) || (rc == -EEXIST)) {
1186 int oplock = 0;
1187 __u16 netfid;
1188
1189 /* BB FIXME Is Generic Read correct for rename? */
1190 /* if renaming directory - we should not say CREATE_NOT_DIR,
1191 need to test renaming open directory, also GENERIC_READ
1192 might not right be right access to request */
1193 rc = CIFSSMBOpen(xid, pTcon, fromName, FILE_OPEN, GENERIC_READ,
1194 CREATE_NOT_DIR, &netfid, &oplock, NULL,
1195 cifs_sb_source->local_nls,
1196 cifs_sb_source->mnt_cifs_flags &
1197 CIFS_MOUNT_MAP_SPECIAL_CHR);
1198 if (rc == 0) {
1199 rc = CIFSSMBRenameOpenFile(xid, pTcon, netfid, toName,
1200 cifs_sb_source->local_nls,
1201 cifs_sb_source->mnt_cifs_flags &
1202 CIFS_MOUNT_MAP_SPECIAL_CHR);
1203 CIFSSMBClose(xid, pTcon, netfid);
1204 }
1205 }
1206
1207 cifs_rename_exit:
1208 kfree(fromName);
1209 kfree(toName);
1210 FreeXid(xid);
1211 return rc;
1212 }
1213
1214 int cifs_revalidate(struct dentry *direntry)
1215 {
1216 int xid;
1217 int rc = 0, wbrc = 0;
1218 char *full_path;
1219 struct cifs_sb_info *cifs_sb;
1220 struct cifsInodeInfo *cifsInode;
1221 loff_t local_size;
1222 struct timespec local_mtime;
1223 bool invalidate_inode = false;
1224
1225 if (direntry->d_inode == NULL)
1226 return -ENOENT;
1227
1228 cifsInode = CIFS_I(direntry->d_inode);
1229
1230 if (cifsInode == NULL)
1231 return -ENOENT;
1232
1233 /* no sense revalidating inode info on file that no one can write */
1234 if (CIFS_I(direntry->d_inode)->clientCanCacheRead)
1235 return rc;
1236
1237 xid = GetXid();
1238
1239 cifs_sb = CIFS_SB(direntry->d_sb);
1240
1241 /* can not safely grab the rename sem here if rename calls revalidate
1242 since that would deadlock */
1243 full_path = build_path_from_dentry(direntry);
1244 if (full_path == NULL) {
1245 FreeXid(xid);
1246 return -ENOMEM;
1247 }
1248 cFYI(1, ("Revalidate: %s inode 0x%p count %d dentry: 0x%p d_time %ld "
1249 "jiffies %ld", full_path, direntry->d_inode,
1250 direntry->d_inode->i_count.counter, direntry,
1251 direntry->d_time, jiffies));
1252
1253 if (cifsInode->time == 0) {
1254 /* was set to zero previously to force revalidate */
1255 } else if (time_before(jiffies, cifsInode->time + HZ) &&
1256 lookupCacheEnabled) {
1257 if ((S_ISREG(direntry->d_inode->i_mode) == 0) ||
1258 (direntry->d_inode->i_nlink == 1)) {
1259 kfree(full_path);
1260 FreeXid(xid);
1261 return rc;
1262 } else {
1263 cFYI(1, ("Have to revalidate file due to hardlinks"));
1264 }
1265 }
1266
1267 /* save mtime and size */
1268 local_mtime = direntry->d_inode->i_mtime;
1269 local_size = direntry->d_inode->i_size;
1270
1271 if (cifs_sb->tcon->unix_ext) {
1272 rc = cifs_get_inode_info_unix(&direntry->d_inode, full_path,
1273 direntry->d_sb, xid);
1274 if (rc) {
1275 cFYI(1, ("error on getting revalidate info %d", rc));
1276 /* if (rc != -ENOENT)
1277 rc = 0; */ /* BB should we cache info on
1278 certain errors? */
1279 }
1280 } else {
1281 rc = cifs_get_inode_info(&direntry->d_inode, full_path, NULL,
1282 direntry->d_sb, xid, NULL);
1283 if (rc) {
1284 cFYI(1, ("error on getting revalidate info %d", rc));
1285 /* if (rc != -ENOENT)
1286 rc = 0; */ /* BB should we cache info on
1287 certain errors? */
1288 }
1289 }
1290 /* should we remap certain errors, access denied?, to zero */
1291
1292 /* if not oplocked, we invalidate inode pages if mtime or file size
1293 had changed on server */
1294
1295 if (timespec_equal(&local_mtime, &direntry->d_inode->i_mtime) &&
1296 (local_size == direntry->d_inode->i_size)) {
1297 cFYI(1, ("cifs_revalidate - inode unchanged"));
1298 } else {
1299 /* file may have changed on server */
1300 if (cifsInode->clientCanCacheRead) {
1301 /* no need to invalidate inode pages since we were the
1302 only ones who could have modified the file and the
1303 server copy is staler than ours */
1304 } else {
1305 invalidate_inode = true;
1306 }
1307 }
1308
1309 /* can not grab this sem since kernel filesys locking documentation
1310 indicates i_mutex may be taken by the kernel on lookup and rename
1311 which could deadlock if we grab the i_mutex here as well */
1312 /* mutex_lock(&direntry->d_inode->i_mutex);*/
1313 /* need to write out dirty pages here */
1314 if (direntry->d_inode->i_mapping) {
1315 /* do we need to lock inode until after invalidate completes
1316 below? */
1317 wbrc = filemap_fdatawrite(direntry->d_inode->i_mapping);
1318 if (wbrc)
1319 CIFS_I(direntry->d_inode)->write_behind_rc = wbrc;
1320 }
1321 if (invalidate_inode) {
1322 /* shrink_dcache not necessary now that cifs dentry ops
1323 are exported for negative dentries */
1324 /* if (S_ISDIR(direntry->d_inode->i_mode))
1325 shrink_dcache_parent(direntry); */
1326 if (S_ISREG(direntry->d_inode->i_mode)) {
1327 if (direntry->d_inode->i_mapping) {
1328 wbrc = filemap_fdatawait(direntry->d_inode->i_mapping);
1329 if (wbrc)
1330 CIFS_I(direntry->d_inode)->write_behind_rc = wbrc;
1331 }
1332 /* may eventually have to do this for open files too */
1333 if (list_empty(&(cifsInode->openFileList))) {
1334 /* changed on server - flush read ahead pages */
1335 cFYI(1, ("Invalidating read ahead data on "
1336 "closed file"));
1337 invalidate_remote_inode(direntry->d_inode);
1338 }
1339 }
1340 }
1341 /* mutex_unlock(&direntry->d_inode->i_mutex); */
1342
1343 kfree(full_path);
1344 FreeXid(xid);
1345 return rc;
1346 }
1347
1348 int cifs_getattr(struct vfsmount *mnt, struct dentry *dentry,
1349 struct kstat *stat)
1350 {
1351 int err = cifs_revalidate(dentry);
1352 if (!err) {
1353 generic_fillattr(dentry->d_inode, stat);
1354 stat->blksize = CIFS_MAX_MSGSIZE;
1355 }
1356 return err;
1357 }
1358
1359 static int cifs_truncate_page(struct address_space *mapping, loff_t from)
1360 {
1361 pgoff_t index = from >> PAGE_CACHE_SHIFT;
1362 unsigned offset = from & (PAGE_CACHE_SIZE - 1);
1363 struct page *page;
1364 int rc = 0;
1365
1366 page = grab_cache_page(mapping, index);
1367 if (!page)
1368 return -ENOMEM;
1369
1370 zero_user_segment(page, offset, PAGE_CACHE_SIZE);
1371 unlock_page(page);
1372 page_cache_release(page);
1373 return rc;
1374 }
1375
1376 static int cifs_vmtruncate(struct inode *inode, loff_t offset)
1377 {
1378 struct address_space *mapping = inode->i_mapping;
1379 unsigned long limit;
1380
1381 spin_lock(&inode->i_lock);
1382 if (inode->i_size < offset)
1383 goto do_expand;
1384 /*
1385 * truncation of in-use swapfiles is disallowed - it would cause
1386 * subsequent swapout to scribble on the now-freed blocks.
1387 */
1388 if (IS_SWAPFILE(inode)) {
1389 spin_unlock(&inode->i_lock);
1390 goto out_busy;
1391 }
1392 i_size_write(inode, offset);
1393 spin_unlock(&inode->i_lock);
1394 /*
1395 * unmap_mapping_range is called twice, first simply for efficiency
1396 * so that truncate_inode_pages does fewer single-page unmaps. However
1397 * after this first call, and before truncate_inode_pages finishes,
1398 * it is possible for private pages to be COWed, which remain after
1399 * truncate_inode_pages finishes, hence the second unmap_mapping_range
1400 * call must be made for correctness.
1401 */
1402 unmap_mapping_range(mapping, offset + PAGE_SIZE - 1, 0, 1);
1403 truncate_inode_pages(mapping, offset);
1404 unmap_mapping_range(mapping, offset + PAGE_SIZE - 1, 0, 1);
1405 goto out_truncate;
1406
1407 do_expand:
1408 limit = current->signal->rlim[RLIMIT_FSIZE].rlim_cur;
1409 if (limit != RLIM_INFINITY && offset > limit) {
1410 spin_unlock(&inode->i_lock);
1411 goto out_sig;
1412 }
1413 if (offset > inode->i_sb->s_maxbytes) {
1414 spin_unlock(&inode->i_lock);
1415 goto out_big;
1416 }
1417 i_size_write(inode, offset);
1418 spin_unlock(&inode->i_lock);
1419 out_truncate:
1420 if (inode->i_op && inode->i_op->truncate)
1421 inode->i_op->truncate(inode);
1422 return 0;
1423 out_sig:
1424 send_sig(SIGXFSZ, current, 0);
1425 out_big:
1426 return -EFBIG;
1427 out_busy:
1428 return -ETXTBSY;
1429 }
1430
1431 static int
1432 cifs_set_file_size(struct inode *inode, struct iattr *attrs,
1433 int xid, char *full_path)
1434 {
1435 int rc;
1436 struct cifsFileInfo *open_file;
1437 struct cifsInodeInfo *cifsInode = CIFS_I(inode);
1438 struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
1439 struct cifsTconInfo *pTcon = cifs_sb->tcon;
1440
1441 /*
1442 * To avoid spurious oplock breaks from server, in the case of
1443 * inodes that we already have open, avoid doing path based
1444 * setting of file size if we can do it by handle.
1445 * This keeps our caching token (oplock) and avoids timeouts
1446 * when the local oplock break takes longer to flush
1447 * writebehind data than the SMB timeout for the SetPathInfo
1448 * request would allow
1449 */
1450 open_file = find_writable_file(cifsInode);
1451 if (open_file) {
1452 __u16 nfid = open_file->netfid;
1453 __u32 npid = open_file->pid;
1454 rc = CIFSSMBSetFileSize(xid, pTcon, attrs->ia_size, nfid,
1455 npid, false);
1456 atomic_dec(&open_file->wrtPending);
1457 cFYI(1, ("SetFSize for attrs rc = %d", rc));
1458 if ((rc == -EINVAL) || (rc == -EOPNOTSUPP)) {
1459 unsigned int bytes_written;
1460 rc = CIFSSMBWrite(xid, pTcon, nfid, 0, attrs->ia_size,
1461 &bytes_written, NULL, NULL, 1);
1462 cFYI(1, ("Wrt seteof rc %d", rc));
1463 }
1464 } else
1465 rc = -EINVAL;
1466
1467 if (rc != 0) {
1468 /* Set file size by pathname rather than by handle
1469 either because no valid, writeable file handle for
1470 it was found or because there was an error setting
1471 it by handle */
1472 rc = CIFSSMBSetEOF(xid, pTcon, full_path, attrs->ia_size,
1473 false, cifs_sb->local_nls,
1474 cifs_sb->mnt_cifs_flags &
1475 CIFS_MOUNT_MAP_SPECIAL_CHR);
1476 cFYI(1, ("SetEOF by path (setattrs) rc = %d", rc));
1477 if ((rc == -EINVAL) || (rc == -EOPNOTSUPP)) {
1478 __u16 netfid;
1479 int oplock = 0;
1480
1481 rc = SMBLegacyOpen(xid, pTcon, full_path,
1482 FILE_OPEN, GENERIC_WRITE,
1483 CREATE_NOT_DIR, &netfid, &oplock, NULL,
1484 cifs_sb->local_nls,
1485 cifs_sb->mnt_cifs_flags &
1486 CIFS_MOUNT_MAP_SPECIAL_CHR);
1487 if (rc == 0) {
1488 unsigned int bytes_written;
1489 rc = CIFSSMBWrite(xid, pTcon, netfid, 0,
1490 attrs->ia_size,
1491 &bytes_written, NULL,
1492 NULL, 1);
1493 cFYI(1, ("wrt seteof rc %d", rc));
1494 CIFSSMBClose(xid, pTcon, netfid);
1495 }
1496 }
1497 }
1498
1499 if (rc == 0) {
1500 rc = cifs_vmtruncate(inode, attrs->ia_size);
1501 cifs_truncate_page(inode->i_mapping, inode->i_size);
1502 }
1503
1504 return rc;
1505 }
1506
1507 int cifs_setattr(struct dentry *direntry, struct iattr *attrs)
1508 {
1509 int xid;
1510 struct cifs_sb_info *cifs_sb;
1511 struct cifsTconInfo *pTcon;
1512 char *full_path = NULL;
1513 int rc = -EACCES;
1514 FILE_BASIC_INFO time_buf;
1515 bool set_time = false;
1516 bool set_dosattr = false;
1517 __u64 mode = NO_CHANGE_64;
1518 __u64 uid = NO_CHANGE_64;
1519 __u64 gid = NO_CHANGE_64;
1520 struct cifsInodeInfo *cifsInode;
1521 struct inode *inode = direntry->d_inode;
1522
1523 xid = GetXid();
1524
1525 cFYI(1, ("setattr on file %s attrs->iavalid 0x%x",
1526 direntry->d_name.name, attrs->ia_valid));
1527
1528 cifs_sb = CIFS_SB(inode->i_sb);
1529 pTcon = cifs_sb->tcon;
1530
1531 if ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_PERM) == 0) {
1532 /* check if we have permission to change attrs */
1533 rc = inode_change_ok(inode, attrs);
1534 if (rc < 0) {
1535 FreeXid(xid);
1536 return rc;
1537 } else
1538 rc = 0;
1539 }
1540
1541 full_path = build_path_from_dentry(direntry);
1542 if (full_path == NULL) {
1543 FreeXid(xid);
1544 return -ENOMEM;
1545 }
1546 cifsInode = CIFS_I(inode);
1547
1548 if ((attrs->ia_valid & ATTR_MTIME) || (attrs->ia_valid & ATTR_SIZE)) {
1549 /*
1550 Flush data before changing file size or changing the last
1551 write time of the file on the server. If the
1552 flush returns error, store it to report later and continue.
1553 BB: This should be smarter. Why bother flushing pages that
1554 will be truncated anyway? Also, should we error out here if
1555 the flush returns error?
1556 */
1557 rc = filemap_write_and_wait(inode->i_mapping);
1558 if (rc != 0) {
1559 cifsInode->write_behind_rc = rc;
1560 rc = 0;
1561 }
1562 }
1563
1564 if (attrs->ia_valid & ATTR_SIZE) {
1565 rc = cifs_set_file_size(inode, attrs, xid, full_path);
1566 if (rc != 0)
1567 goto cifs_setattr_exit;
1568 }
1569
1570 /*
1571 * Without unix extensions we can't send ownership changes to the
1572 * server, so silently ignore them. This is consistent with how
1573 * local DOS/Windows filesystems behave (VFAT, NTFS, etc). With
1574 * CIFSACL support + proper Windows to Unix idmapping, we may be
1575 * able to support this in the future.
1576 */
1577 if (!pTcon->unix_ext &&
1578 !(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SET_UID)) {
1579 attrs->ia_valid &= ~(ATTR_UID | ATTR_GID);
1580 } else {
1581 if (attrs->ia_valid & ATTR_UID) {
1582 cFYI(1, ("UID changed to %d", attrs->ia_uid));
1583 uid = attrs->ia_uid;
1584 }
1585 if (attrs->ia_valid & ATTR_GID) {
1586 cFYI(1, ("GID changed to %d", attrs->ia_gid));
1587 gid = attrs->ia_gid;
1588 }
1589 }
1590
1591 time_buf.Attributes = 0;
1592
1593 /* skip mode change if it's just for clearing setuid/setgid */
1594 if (attrs->ia_valid & (ATTR_KILL_SUID|ATTR_KILL_SGID))
1595 attrs->ia_valid &= ~ATTR_MODE;
1596
1597 if (attrs->ia_valid & ATTR_MODE) {
1598 cFYI(1, ("Mode changed to 0%o", attrs->ia_mode));
1599 mode = attrs->ia_mode;
1600 }
1601
1602 if ((pTcon->unix_ext)
1603 && (attrs->ia_valid & (ATTR_MODE | ATTR_GID | ATTR_UID))) {
1604 struct cifs_unix_set_info_args args = {
1605 .mode = mode,
1606 .uid = uid,
1607 .gid = gid,
1608 .ctime = NO_CHANGE_64,
1609 .atime = NO_CHANGE_64,
1610 .mtime = NO_CHANGE_64,
1611 .device = 0,
1612 };
1613 rc = CIFSSMBUnixSetInfo(xid, pTcon, full_path, &args,
1614 cifs_sb->local_nls,
1615 cifs_sb->mnt_cifs_flags &
1616 CIFS_MOUNT_MAP_SPECIAL_CHR);
1617 } else if (attrs->ia_valid & ATTR_MODE) {
1618 rc = 0;
1619 #ifdef CONFIG_CIFS_EXPERIMENTAL
1620 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_CIFS_ACL)
1621 rc = mode_to_acl(inode, full_path, mode);
1622 else
1623 #endif
1624 if (((mode & S_IWUGO) == 0) &&
1625 (cifsInode->cifsAttrs & ATTR_READONLY) == 0) {
1626 set_dosattr = true;
1627 time_buf.Attributes = cpu_to_le32(cifsInode->cifsAttrs |
1628 ATTR_READONLY);
1629 /* fix up mode if we're not using dynperm */
1630 if ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DYNPERM) == 0)
1631 attrs->ia_mode = inode->i_mode & ~S_IWUGO;
1632 } else if ((mode & S_IWUGO) &&
1633 (cifsInode->cifsAttrs & ATTR_READONLY)) {
1634 /* If file is readonly on server, we would
1635 not be able to write to it - so if any write
1636 bit is enabled for user or group or other we
1637 need to at least try to remove r/o dos attr */
1638 set_dosattr = true;
1639 time_buf.Attributes = cpu_to_le32(cifsInode->cifsAttrs &
1640 (~ATTR_READONLY));
1641 /* Windows ignores set to zero */
1642 if (time_buf.Attributes == 0)
1643 time_buf.Attributes |= cpu_to_le32(ATTR_NORMAL);
1644
1645 /* reset local inode permissions to normal */
1646 if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DYNPERM)) {
1647 attrs->ia_mode &= ~(S_IALLUGO);
1648 if (S_ISDIR(inode->i_mode))
1649 attrs->ia_mode |=
1650 cifs_sb->mnt_dir_mode;
1651 else
1652 attrs->ia_mode |=
1653 cifs_sb->mnt_file_mode;
1654 }
1655 } else if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DYNPERM)) {
1656 /* ignore mode change - ATTR_READONLY hasn't changed */
1657 attrs->ia_valid &= ~ATTR_MODE;
1658 }
1659 }
1660
1661 if (attrs->ia_valid & ATTR_ATIME) {
1662 set_time = true;
1663 time_buf.LastAccessTime =
1664 cpu_to_le64(cifs_UnixTimeToNT(attrs->ia_atime));
1665 } else
1666 time_buf.LastAccessTime = 0;
1667
1668 if (attrs->ia_valid & ATTR_MTIME) {
1669 set_time = true;
1670 time_buf.LastWriteTime =
1671 cpu_to_le64(cifs_UnixTimeToNT(attrs->ia_mtime));
1672 } else
1673 time_buf.LastWriteTime = 0;
1674 /* Do not set ctime explicitly unless other time
1675 stamps are changed explicitly (i.e. by utime()
1676 since we would then have a mix of client and
1677 server times */
1678
1679 if (set_time && (attrs->ia_valid & ATTR_CTIME)) {
1680 set_time = true;
1681 /* Although Samba throws this field away
1682 it may be useful to Windows - but we do
1683 not want to set ctime unless some other
1684 timestamp is changing */
1685 cFYI(1, ("CIFS - CTIME changed"));
1686 time_buf.ChangeTime =
1687 cpu_to_le64(cifs_UnixTimeToNT(attrs->ia_ctime));
1688 } else
1689 time_buf.ChangeTime = 0;
1690
1691 if (set_time || set_dosattr) {
1692 time_buf.CreationTime = 0; /* do not change */
1693 /* In the future we should experiment - try setting timestamps
1694 via Handle (SetFileInfo) instead of by path */
1695 if (!(pTcon->ses->flags & CIFS_SES_NT4))
1696 rc = CIFSSMBSetPathInfo(xid, pTcon, full_path,
1697 &time_buf, cifs_sb->local_nls,
1698 cifs_sb->mnt_cifs_flags &
1699 CIFS_MOUNT_MAP_SPECIAL_CHR);
1700 else
1701 rc = -EOPNOTSUPP;
1702
1703 if (rc == -EOPNOTSUPP) {
1704 int oplock = 0;
1705 __u16 netfid;
1706
1707 cFYI(1, ("calling SetFileInfo since SetPathInfo for "
1708 "times not supported by this server"));
1709 /* BB we could scan to see if we already have it open
1710 and pass in pid of opener to function */
1711 rc = CIFSSMBOpen(xid, pTcon, full_path, FILE_OPEN,
1712 SYNCHRONIZE | FILE_WRITE_ATTRIBUTES,
1713 CREATE_NOT_DIR, &netfid, &oplock,
1714 NULL, cifs_sb->local_nls,
1715 cifs_sb->mnt_cifs_flags &
1716 CIFS_MOUNT_MAP_SPECIAL_CHR);
1717 if (rc == 0) {
1718 rc = CIFSSMBSetFileInfo(xid, pTcon, &time_buf,
1719 netfid, current->tgid);
1720 CIFSSMBClose(xid, pTcon, netfid);
1721 } else {
1722 /* BB For even older servers we could convert time_buf
1723 into old DOS style which uses two second
1724 granularity */
1725
1726 /* rc = CIFSSMBSetTimesLegacy(xid, pTcon, full_path,
1727 &time_buf, cifs_sb->local_nls); */
1728 }
1729 }
1730 /* Even if error on time set, no sense failing the call if
1731 the server would set the time to a reasonable value anyway,
1732 and this check ensures that we are not being called from
1733 sys_utimes in which case we ought to fail the call back to
1734 the user when the server rejects the call */
1735 if ((rc) && (attrs->ia_valid &
1736 (ATTR_MODE | ATTR_GID | ATTR_UID | ATTR_SIZE)))
1737 rc = 0;
1738 }
1739
1740 /* do not need local check to inode_check_ok since the server does
1741 that */
1742 if (!rc)
1743 rc = inode_setattr(inode, attrs);
1744 cifs_setattr_exit:
1745 kfree(full_path);
1746 FreeXid(xid);
1747 return rc;
1748 }
1749
1750 #if 0
1751 void cifs_delete_inode(struct inode *inode)
1752 {
1753 cFYI(1, ("In cifs_delete_inode, inode = 0x%p", inode));
1754 /* may have to add back in if and when safe distributed caching of
1755 directories added e.g. via FindNotify */
1756 }
1757 #endif
kernel source for telekom puls (alcatel/mediatek)