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md: fix possible oops when removing a bitmap from an active array
[linux-2.6/openmoko-kernel.git] / fs / cifs / inode.c
blob129dbfe4dca7c0de657f6bd39d26a89ae651df30
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) {
223 if (rc == -EREMOTE && !is_dfs_referral) {
224 is_dfs_referral = true;
225 cFYI(DBG2, ("DFS ref"));
226 /* for DFS, server does not give us real inode data */
227 fill_fake_finddataunix(&find_data, sb);
228 rc = 0;
229 }
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
422 pTcon = cifs_sb->tcon;
423 cFYI(1, ("Getting info on %s", full_path));
424
425 if ((pfindData == NULL) && (*pinode != NULL)) {
426 if (CIFS_I(*pinode)->clientCanCacheRead) {
427 cFYI(1, ("No need to revalidate cached inode sizes"));
428 return rc;
429 }
430 }
431
432 /* if file info not passed in then get it from server */
433 if (pfindData == NULL) {
434 buf = kmalloc(sizeof(FILE_ALL_INFO), GFP_KERNEL);
435 if (buf == NULL)
436 return -ENOMEM;
437 pfindData = (FILE_ALL_INFO *)buf;
438
439 /* could do find first instead but this returns more info */
440 rc = CIFSSMBQPathInfo(xid, pTcon, full_path, pfindData,
441 0 /* not legacy */,
442 cifs_sb->local_nls, cifs_sb->mnt_cifs_flags &
443 CIFS_MOUNT_MAP_SPECIAL_CHR);
444 /* BB optimize code so we do not make the above call
445 when server claims no NT SMB support and the above call
446 failed at least once - set flag in tcon or mount */
447 if ((rc == -EOPNOTSUPP) || (rc == -EINVAL)) {
448 rc = SMBQueryInformation(xid, pTcon, full_path,
449 pfindData, cifs_sb->local_nls,
450 cifs_sb->mnt_cifs_flags &
451 CIFS_MOUNT_MAP_SPECIAL_CHR);
452 adjustTZ = true;
453 }
454 }
455 /* dump_mem("\nQPathInfo return data",&findData, sizeof(findData)); */
456 if (rc == -EREMOTE) {
457 is_dfs_referral = true;
458 fill_fake_finddata(pfindData, sb);
459 rc = 0;
460 } else if (rc)
461 goto cgii_exit;
462
463 attr = le32_to_cpu(pfindData->Attributes);
464
465 /* get new inode */
466 if (*pinode == NULL) {
467 *pinode = new_inode(sb);
468 if (*pinode == NULL) {
469 rc = -ENOMEM;
470 goto cgii_exit;
471 }
472 /* Is an i_ino of zero legal? Can we use that to check
473 if the server supports returning inode numbers? Are
474 there other sanity checks we can use to ensure that
475 the server is really filling in that field? */
476
477 /* We can not use the IndexNumber field by default from
478 Windows or Samba (in ALL_INFO buf) but we can request
479 it explicitly. It may not be unique presumably if
480 the server has multiple devices mounted under one share */
481
482 /* There may be higher info levels that work but are
483 there Windows server or network appliances for which
484 IndexNumber field is not guaranteed unique? */
485
486 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM) {
487 int rc1 = 0;
488 __u64 inode_num;
489
490 rc1 = CIFSGetSrvInodeNumber(xid, pTcon,
491 full_path, &inode_num,
492 cifs_sb->local_nls,
493 cifs_sb->mnt_cifs_flags &
494 CIFS_MOUNT_MAP_SPECIAL_CHR);
495 if (rc1) {
496 cFYI(1, ("GetSrvInodeNum rc %d", rc1));
497 /* BB EOPNOSUPP disable SERVER_INUM? */
498 } else /* do we need cast or hash to ino? */
499 (*pinode)->i_ino = inode_num;
500 } /* else ino incremented to unique num in new_inode*/
501 if (sb->s_flags & MS_NOATIME)
502 (*pinode)->i_flags |= S_NOATIME | S_NOCMTIME;
503 insert_inode_hash(*pinode);
504 }
505 inode = *pinode;
506 cifsInfo = CIFS_I(inode);
507 cifsInfo->cifsAttrs = attr;
508 cFYI(1, ("Old time %ld", cifsInfo->time));
509 cifsInfo->time = jiffies;
510 cFYI(1, ("New time %ld", cifsInfo->time));
511
512 /* blksize needs to be multiple of two. So safer to default to
513 blksize and blkbits set in superblock so 2**blkbits and blksize
514 will match rather than setting to:
515 (pTcon->ses->server->maxBuf - MAX_CIFS_HDR_SIZE) & 0xFFFFFE00;*/
516
517 /* Linux can not store file creation time so ignore it */
518 if (pfindData->LastAccessTime)
519 inode->i_atime = cifs_NTtimeToUnix
520 (le64_to_cpu(pfindData->LastAccessTime));
521 else /* do not need to use current_fs_time - time not stored */
522 inode->i_atime = CURRENT_TIME;
523 inode->i_mtime =
524 cifs_NTtimeToUnix(le64_to_cpu(pfindData->LastWriteTime));
525 inode->i_ctime =
526 cifs_NTtimeToUnix(le64_to_cpu(pfindData->ChangeTime));
527 cFYI(DBG2, ("Attributes came in as 0x%x", attr));
528 if (adjustTZ && (pTcon->ses) && (pTcon->ses->server)) {
529 inode->i_ctime.tv_sec += pTcon->ses->server->timeAdj;
530 inode->i_mtime.tv_sec += pTcon->ses->server->timeAdj;
531 }
532
533 /* set default mode. will override for dirs below */
534 if (atomic_read(&cifsInfo->inUse) == 0)
535 /* new inode, can safely set these fields */
536 inode->i_mode = cifs_sb->mnt_file_mode;
537 else /* since we set the inode type below we need to mask off
538 to avoid strange results if type changes and both
539 get orred in */
540 inode->i_mode &= ~S_IFMT;
541 /* if (attr & ATTR_REPARSE) */
542 /* We no longer handle these as symlinks because we could not
543 follow them due to the absolute path with drive letter */
544 if (attr & ATTR_DIRECTORY) {
545 /* override default perms since we do not do byte range locking
546 on dirs */
547 inode->i_mode = cifs_sb->mnt_dir_mode;
548 inode->i_mode |= S_IFDIR;
549 } else if ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_UNX_EMUL) &&
550 (cifsInfo->cifsAttrs & ATTR_SYSTEM) &&
551 /* No need to le64 convert size of zero */
552 (pfindData->EndOfFile == 0)) {
553 inode->i_mode = cifs_sb->mnt_file_mode;
554 inode->i_mode |= S_IFIFO;
555 /* BB Finish for SFU style symlinks and devices */
556 } else if ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_UNX_EMUL) &&
557 (cifsInfo->cifsAttrs & ATTR_SYSTEM)) {
558 if (decode_sfu_inode(inode, le64_to_cpu(pfindData->EndOfFile),
559 full_path, cifs_sb, xid))
560 cFYI(1, ("Unrecognized sfu inode type"));
561
562 cFYI(1, ("sfu mode 0%o", inode->i_mode));
563 } else {
564 inode->i_mode |= S_IFREG;
565 /* treat dos attribute of read-only as read-only mode eg 555 */
566 if (cifsInfo->cifsAttrs & ATTR_READONLY)
567 inode->i_mode &= ~(S_IWUGO);
568 else if ((inode->i_mode & S_IWUGO) == 0)
569 /* the ATTR_READONLY flag may have been */
570 /* changed on server -- set any w bits */
571 /* allowed by mnt_file_mode */
572 inode->i_mode |= (S_IWUGO & cifs_sb->mnt_file_mode);
573 /* BB add code to validate if device or weird share or device type? */
574 }
575
576 spin_lock(&inode->i_lock);
577 if (is_size_safe_to_change(cifsInfo,
578 le64_to_cpu(pfindData->EndOfFile))) {
579 /* can not safely shrink the file size here if the
580 client is writing to it due to potential races */
581 i_size_write(inode, le64_to_cpu(pfindData->EndOfFile));
582
583 /* 512 bytes (2**9) is the fake blocksize that must be
584 used for this calculation */
585 inode->i_blocks = (512 - 1 + le64_to_cpu(
586 pfindData->AllocationSize)) >> 9;
587 }
588 spin_unlock(&inode->i_lock);
589
590 inode->i_nlink = le32_to_cpu(pfindData->NumberOfLinks);
591
592 /* BB fill in uid and gid here? with help from winbind?
593 or retrieve from NTFS stream extended attribute */
594 #ifdef CONFIG_CIFS_EXPERIMENTAL
595 /* fill in 0777 bits from ACL */
596 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_CIFS_ACL) {
597 cFYI(1, ("Getting mode bits from ACL"));
598 acl_to_uid_mode(inode, full_path, pfid);
599 }
600 #endif
601 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_UNX_EMUL) {
602 /* fill in remaining high mode bits e.g. SUID, VTX */
603 get_sfu_mode(inode, full_path, cifs_sb, xid);
604 } else if (atomic_read(&cifsInfo->inUse) == 0) {
605 inode->i_uid = cifs_sb->mnt_uid;
606 inode->i_gid = cifs_sb->mnt_gid;
607 /* set so we do not keep refreshing these fields with
608 bad data after user has changed them in memory */
609 atomic_set(&cifsInfo->inUse, 1);
610 }
611
612 cifs_set_ops(inode, is_dfs_referral);
613
614
615
616
617 cgii_exit:
618 kfree(buf);
619 return rc;
620 }
621
622 static const struct inode_operations cifs_ipc_inode_ops = {
623 .lookup = cifs_lookup,
624 };
625
626 /* gets root inode */
627 struct inode *cifs_iget(struct super_block *sb, unsigned long ino)
628 {
629 int xid;
630 struct cifs_sb_info *cifs_sb;
631 struct inode *inode;
632 long rc;
633
634 inode = iget_locked(sb, ino);
635 if (!inode)
636 return ERR_PTR(-ENOMEM);
637 if (!(inode->i_state & I_NEW))
638 return inode;
639
640 cifs_sb = CIFS_SB(inode->i_sb);
641 xid = GetXid();
642
643 if (cifs_sb->tcon->unix_ext)
644 rc = cifs_get_inode_info_unix(&inode, "", inode->i_sb, xid);
645 else
646 rc = cifs_get_inode_info(&inode, "", NULL, inode->i_sb, xid,
647 NULL);
648 if (rc && cifs_sb->tcon->ipc) {
649 cFYI(1, ("ipc connection - fake read inode"));
650 inode->i_mode |= S_IFDIR;
651 inode->i_nlink = 2;
652 inode->i_op = &cifs_ipc_inode_ops;
653 inode->i_fop = &simple_dir_operations;
654 inode->i_uid = cifs_sb->mnt_uid;
655 inode->i_gid = cifs_sb->mnt_gid;
656 _FreeXid(xid);
657 iget_failed(inode);
658 return ERR_PTR(rc);
659 }
660
661 unlock_new_inode(inode);
662
663 /* can not call macro FreeXid here since in a void func
664 * TODO: This is no longer true
665 */
666 _FreeXid(xid);
667 return inode;
668 }
669
670 int cifs_unlink(struct inode *inode, struct dentry *direntry)
671 {
672 int rc = 0;
673 int xid;
674 struct cifs_sb_info *cifs_sb;
675 struct cifsTconInfo *pTcon;
676 char *full_path = NULL;
677 struct cifsInodeInfo *cifsInode;
678 FILE_BASIC_INFO *pinfo_buf;
679
680 cFYI(1, ("cifs_unlink, inode = 0x%p", inode));
681
682 xid = GetXid();
683
684 if (inode)
685 cifs_sb = CIFS_SB(inode->i_sb);
686 else
687 cifs_sb = CIFS_SB(direntry->d_sb);
688 pTcon = cifs_sb->tcon;
689
690 /* Unlink can be called from rename so we can not grab the sem here
691 since we deadlock otherwise */
692 /* mutex_lock(&direntry->d_sb->s_vfs_rename_mutex);*/
693 full_path = build_path_from_dentry(direntry);
694 /* mutex_unlock(&direntry->d_sb->s_vfs_rename_mutex);*/
695 if (full_path == NULL) {
696 FreeXid(xid);
697 return -ENOMEM;
698 }
699
700 if ((pTcon->ses->capabilities & CAP_UNIX) &&
701 (CIFS_UNIX_POSIX_PATH_OPS_CAP &
702 le64_to_cpu(pTcon->fsUnixInfo.Capability))) {
703 rc = CIFSPOSIXDelFile(xid, pTcon, full_path,
704 SMB_POSIX_UNLINK_FILE_TARGET, cifs_sb->local_nls,
705 cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR);
706 cFYI(1, ("posix del rc %d", rc));
707 if ((rc == 0) || (rc == -ENOENT))
708 goto psx_del_no_retry;
709 }
710
711 rc = CIFSSMBDelFile(xid, pTcon, full_path, cifs_sb->local_nls,
712 cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR);
713 psx_del_no_retry:
714 if (!rc) {
715 if (direntry->d_inode)
716 drop_nlink(direntry->d_inode);
717 } else if (rc == -ENOENT) {
718 d_drop(direntry);
719 } else if (rc == -ETXTBSY) {
720 int oplock = 0;
721 __u16 netfid;
722
723 rc = CIFSSMBOpen(xid, pTcon, full_path, FILE_OPEN, DELETE,
724 CREATE_NOT_DIR | CREATE_DELETE_ON_CLOSE,
725 &netfid, &oplock, NULL, cifs_sb->local_nls,
726 cifs_sb->mnt_cifs_flags &
727 CIFS_MOUNT_MAP_SPECIAL_CHR);
728 if (rc == 0) {
729 CIFSSMBRenameOpenFile(xid, pTcon, netfid, NULL,
730 cifs_sb->local_nls,
731 cifs_sb->mnt_cifs_flags &
732 CIFS_MOUNT_MAP_SPECIAL_CHR);
733 CIFSSMBClose(xid, pTcon, netfid);
734 if (direntry->d_inode)
735 drop_nlink(direntry->d_inode);
736 }
737 } else if (rc == -EACCES) {
738 /* try only if r/o attribute set in local lookup data? */
739 pinfo_buf = kzalloc(sizeof(FILE_BASIC_INFO), GFP_KERNEL);
740 if (pinfo_buf) {
741 /* ATTRS set to normal clears r/o bit */
742 pinfo_buf->Attributes = cpu_to_le32(ATTR_NORMAL);
743 if (!(pTcon->ses->flags & CIFS_SES_NT4))
744 rc = CIFSSMBSetTimes(xid, pTcon, full_path,
745 pinfo_buf,
746 cifs_sb->local_nls,
747 cifs_sb->mnt_cifs_flags &
748 CIFS_MOUNT_MAP_SPECIAL_CHR);
749 else
750 rc = -EOPNOTSUPP;
751
752 if (rc == -EOPNOTSUPP) {
753 int oplock = 0;
754 __u16 netfid;
755 /* rc = CIFSSMBSetAttrLegacy(xid, pTcon,
756 full_path,
757 (__u16)ATTR_NORMAL,
758 cifs_sb->local_nls);
759 For some strange reason it seems that NT4 eats the
760 old setattr call without actually setting the
761 attributes so on to the third attempted workaround
762 */
763
764 /* BB could scan to see if we already have it open
765 and pass in pid of opener to function */
766 rc = CIFSSMBOpen(xid, pTcon, full_path,
767 FILE_OPEN, SYNCHRONIZE |
768 FILE_WRITE_ATTRIBUTES, 0,
769 &netfid, &oplock, NULL,
770 cifs_sb->local_nls,
771 cifs_sb->mnt_cifs_flags &
772 CIFS_MOUNT_MAP_SPECIAL_CHR);
773 if (rc == 0) {
774 rc = CIFSSMBSetFileTimes(xid, pTcon,
775 pinfo_buf,
776 netfid);
777 CIFSSMBClose(xid, pTcon, netfid);
778 }
779 }
780 kfree(pinfo_buf);
781 }
782 if (rc == 0) {
783 rc = CIFSSMBDelFile(xid, pTcon, full_path,
784 cifs_sb->local_nls,
785 cifs_sb->mnt_cifs_flags &
786 CIFS_MOUNT_MAP_SPECIAL_CHR);
787 if (!rc) {
788 if (direntry->d_inode)
789 drop_nlink(direntry->d_inode);
790 } else if (rc == -ETXTBSY) {
791 int oplock = 0;
792 __u16 netfid;
793
794 rc = CIFSSMBOpen(xid, pTcon, full_path,
795 FILE_OPEN, DELETE,
796 CREATE_NOT_DIR |
797 CREATE_DELETE_ON_CLOSE,
798 &netfid, &oplock, NULL,
799 cifs_sb->local_nls,
800 cifs_sb->mnt_cifs_flags &
801 CIFS_MOUNT_MAP_SPECIAL_CHR);
802 if (rc == 0) {
803 CIFSSMBRenameOpenFile(xid, pTcon,
804 netfid, NULL,
805 cifs_sb->local_nls,
806 cifs_sb->mnt_cifs_flags &
807 CIFS_MOUNT_MAP_SPECIAL_CHR);
808 CIFSSMBClose(xid, pTcon, netfid);
809 if (direntry->d_inode)
810 drop_nlink(direntry->d_inode);
811 }
812 /* BB if rc = -ETXTBUSY goto the rename logic BB */
813 }
814 }
815 }
816 if (direntry->d_inode) {
817 cifsInode = CIFS_I(direntry->d_inode);
818 cifsInode->time = 0; /* will force revalidate to get info
819 when needed */
820 direntry->d_inode->i_ctime = current_fs_time(inode->i_sb);
821 }
822 if (inode) {
823 inode->i_ctime = inode->i_mtime = current_fs_time(inode->i_sb);
824 cifsInode = CIFS_I(inode);
825 cifsInode->time = 0; /* force revalidate of dir as well */
826 }
827
828 kfree(full_path);
829 FreeXid(xid);
830 return rc;
831 }
832
833 static void posix_fill_in_inode(struct inode *tmp_inode,
834 FILE_UNIX_BASIC_INFO *pData, int isNewInode)
835 {
836 struct cifsInodeInfo *cifsInfo = CIFS_I(tmp_inode);
837 loff_t local_size;
838 struct timespec local_mtime;
839
840 cifsInfo->time = jiffies;
841 atomic_inc(&cifsInfo->inUse);
842
843 /* save mtime and size */
844 local_mtime = tmp_inode->i_mtime;
845 local_size = tmp_inode->i_size;
846
847 cifs_unix_info_to_inode(tmp_inode, pData, 1);
848 cifs_set_ops(tmp_inode, false);
849
850 if (!S_ISREG(tmp_inode->i_mode))
851 return;
852
853 /*
854 * No sense invalidating pages for new inode
855 * since we we have not started caching
856 * readahead file data yet.
857 */
858 if (isNewInode)
859 return;
860
861 if (timespec_equal(&tmp_inode->i_mtime, &local_mtime) &&
862 (local_size == tmp_inode->i_size)) {
863 cFYI(1, ("inode exists but unchanged"));
864 } else {
865 /* file may have changed on server */
866 cFYI(1, ("invalidate inode, readdir detected change"));
867 invalidate_remote_inode(tmp_inode);
868 }
869 }
870
871 int cifs_mkdir(struct inode *inode, struct dentry *direntry, int mode)
872 {
873 int rc = 0;
874 int xid;
875 struct cifs_sb_info *cifs_sb;
876 struct cifsTconInfo *pTcon;
877 char *full_path = NULL;
878 struct inode *newinode = NULL;
879
880 cFYI(1, ("In cifs_mkdir, mode = 0x%x inode = 0x%p", mode, inode));
881
882 xid = GetXid();
883
884 cifs_sb = CIFS_SB(inode->i_sb);
885 pTcon = cifs_sb->tcon;
886
887 full_path = build_path_from_dentry(direntry);
888 if (full_path == NULL) {
889 FreeXid(xid);
890 return -ENOMEM;
891 }
892
893 if ((pTcon->ses->capabilities & CAP_UNIX) &&
894 (CIFS_UNIX_POSIX_PATH_OPS_CAP &
895 le64_to_cpu(pTcon->fsUnixInfo.Capability))) {
896 u32 oplock = 0;
897 FILE_UNIX_BASIC_INFO *pInfo =
898 kzalloc(sizeof(FILE_UNIX_BASIC_INFO), GFP_KERNEL);
899 if (pInfo == NULL) {
900 rc = -ENOMEM;
901 goto mkdir_out;
902 }
903
904 mode &= ~current->fs->umask;
905 rc = CIFSPOSIXCreate(xid, pTcon, SMB_O_DIRECTORY | SMB_O_CREAT,
906 mode, NULL /* netfid */, pInfo, &oplock,
907 full_path, cifs_sb->local_nls,
908 cifs_sb->mnt_cifs_flags &
909 CIFS_MOUNT_MAP_SPECIAL_CHR);
910 if (rc == -EOPNOTSUPP) {
911 kfree(pInfo);
912 goto mkdir_retry_old;
913 } else if (rc) {
914 cFYI(1, ("posix mkdir returned 0x%x", rc));
915 d_drop(direntry);
916 } else {
917 if (pInfo->Type == cpu_to_le32(-1)) {
918 /* no return info, go query for it */
919 kfree(pInfo);
920 goto mkdir_get_info;
921 }
922 /*BB check (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SET_UID ) to see if need
923 to set uid/gid */
924 inc_nlink(inode);
925 if (pTcon->nocase)
926 direntry->d_op = &cifs_ci_dentry_ops;
927 else
928 direntry->d_op = &cifs_dentry_ops;
929
930 newinode = new_inode(inode->i_sb);
931 if (newinode == NULL) {
932 kfree(pInfo);
933 goto mkdir_get_info;
934 }
935 /* Is an i_ino of zero legal? */
936 /* Are there sanity checks we can use to ensure that
937 the server is really filling in that field? */
938 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM) {
939 newinode->i_ino =
940 (unsigned long)pInfo->UniqueId;
941 } /* note ino incremented to unique num in new_inode */
942 if (inode->i_sb->s_flags & MS_NOATIME)
943 newinode->i_flags |= S_NOATIME | S_NOCMTIME;
944 newinode->i_nlink = 2;
945
946 insert_inode_hash(newinode);
947 d_instantiate(direntry, newinode);
948
949 /* we already checked in POSIXCreate whether
950 frame was long enough */
951 posix_fill_in_inode(direntry->d_inode,
952 pInfo, 1 /* NewInode */);
953 #ifdef CONFIG_CIFS_DEBUG2
954 cFYI(1, ("instantiated dentry %p %s to inode %p",
955 direntry, direntry->d_name.name, newinode));
956
957 if (newinode->i_nlink != 2)
958 cFYI(1, ("unexpected number of links %d",
959 newinode->i_nlink));
960 #endif
961 }
962 kfree(pInfo);
963 goto mkdir_out;
964 }
965 mkdir_retry_old:
966 /* BB add setting the equivalent of mode via CreateX w/ACLs */
967 rc = CIFSSMBMkDir(xid, pTcon, full_path, cifs_sb->local_nls,
968 cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR);
969 if (rc) {
970 cFYI(1, ("cifs_mkdir returned 0x%x", rc));
971 d_drop(direntry);
972 } else {
973 mkdir_get_info:
974 inc_nlink(inode);
975 if (pTcon->unix_ext)
976 rc = cifs_get_inode_info_unix(&newinode, full_path,
977 inode->i_sb, xid);
978 else
979 rc = cifs_get_inode_info(&newinode, full_path, NULL,
980 inode->i_sb, xid, NULL);
981
982 if (pTcon->nocase)
983 direntry->d_op = &cifs_ci_dentry_ops;
984 else
985 direntry->d_op = &cifs_dentry_ops;
986 d_instantiate(direntry, newinode);
987 /* setting nlink not necessary except in cases where we
988 * failed to get it from the server or was set bogus */
989 if ((direntry->d_inode) && (direntry->d_inode->i_nlink < 2))
990 direntry->d_inode->i_nlink = 2;
991 mode &= ~current->fs->umask;
992 if (pTcon->unix_ext) {
993 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SET_UID) {
994 CIFSSMBUnixSetPerms(xid, pTcon, full_path,
995 mode,
996 (__u64)current->fsuid,
997 (__u64)current->fsgid,
998 0 /* dev_t */,
999 cifs_sb->local_nls,
1000 cifs_sb->mnt_cifs_flags &
1001 CIFS_MOUNT_MAP_SPECIAL_CHR);
1002 } else {
1003 CIFSSMBUnixSetPerms(xid, pTcon, full_path,
1004 mode, (__u64)-1,
1005 (__u64)-1, 0 /* dev_t */,
1006 cifs_sb->local_nls,
1007 cifs_sb->mnt_cifs_flags &
1008 CIFS_MOUNT_MAP_SPECIAL_CHR);
1009 }
1010 } else {
1011 if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_CIFS_ACL) &&
1012 (mode & S_IWUGO) == 0) {
1013 FILE_BASIC_INFO pInfo;
1014 memset(&pInfo, 0, sizeof(pInfo));
1015 pInfo.Attributes = cpu_to_le32(ATTR_READONLY);
1016 CIFSSMBSetTimes(xid, pTcon, full_path,
1017 &pInfo, cifs_sb->local_nls,
1018 cifs_sb->mnt_cifs_flags &
1019 CIFS_MOUNT_MAP_SPECIAL_CHR);
1020 }
1021 if (direntry->d_inode) {
1022 direntry->d_inode->i_mode = mode;
1023 direntry->d_inode->i_mode |= S_IFDIR;
1024 if (cifs_sb->mnt_cifs_flags &
1025 CIFS_MOUNT_SET_UID) {
1026 direntry->d_inode->i_uid =
1027 current->fsuid;
1028 direntry->d_inode->i_gid =
1029 current->fsgid;
1030 }
1031 }
1032 }
1033 }
1034 mkdir_out:
1035 kfree(full_path);
1036 FreeXid(xid);
1037 return rc;
1038 }
1039
1040 int cifs_rmdir(struct inode *inode, struct dentry *direntry)
1041 {
1042 int rc = 0;
1043 int xid;
1044 struct cifs_sb_info *cifs_sb;
1045 struct cifsTconInfo *pTcon;
1046 char *full_path = NULL;
1047 struct cifsInodeInfo *cifsInode;
1048
1049 cFYI(1, ("cifs_rmdir, inode = 0x%p", inode));
1050
1051 xid = GetXid();
1052
1053 cifs_sb = CIFS_SB(inode->i_sb);
1054 pTcon = cifs_sb->tcon;
1055
1056 full_path = build_path_from_dentry(direntry);
1057 if (full_path == NULL) {
1058 FreeXid(xid);
1059 return -ENOMEM;
1060 }
1061
1062 rc = CIFSSMBRmDir(xid, pTcon, full_path, cifs_sb->local_nls,
1063 cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR);
1064
1065 if (!rc) {
1066 drop_nlink(inode);
1067 spin_lock(&direntry->d_inode->i_lock);
1068 i_size_write(direntry->d_inode, 0);
1069 clear_nlink(direntry->d_inode);
1070 spin_unlock(&direntry->d_inode->i_lock);
1071 }
1072
1073 cifsInode = CIFS_I(direntry->d_inode);
1074 cifsInode->time = 0; /* force revalidate to go get info when
1075 needed */
1076 direntry->d_inode->i_ctime = inode->i_ctime = inode->i_mtime =
1077 current_fs_time(inode->i_sb);
1078
1079 kfree(full_path);
1080 FreeXid(xid);
1081 return rc;
1082 }
1083
1084 int cifs_rename(struct inode *source_inode, struct dentry *source_direntry,
1085 struct inode *target_inode, struct dentry *target_direntry)
1086 {
1087 char *fromName;
1088 char *toName;
1089 struct cifs_sb_info *cifs_sb_source;
1090 struct cifs_sb_info *cifs_sb_target;
1091 struct cifsTconInfo *pTcon;
1092 int xid;
1093 int rc = 0;
1094
1095 xid = GetXid();
1096
1097 cifs_sb_target = CIFS_SB(target_inode->i_sb);
1098 cifs_sb_source = CIFS_SB(source_inode->i_sb);
1099 pTcon = cifs_sb_source->tcon;
1100
1101 if (pTcon != cifs_sb_target->tcon) {
1102 FreeXid(xid);
1103 return -EXDEV; /* BB actually could be allowed if same server,
1104 but different share.
1105 Might eventually add support for this */
1106 }
1107
1108 /* we already have the rename sem so we do not need to grab it again
1109 here to protect the path integrity */
1110 fromName = build_path_from_dentry(source_direntry);
1111 toName = build_path_from_dentry(target_direntry);
1112 if ((fromName == NULL) || (toName == NULL)) {
1113 rc = -ENOMEM;
1114 goto cifs_rename_exit;
1115 }
1116
1117 rc = CIFSSMBRename(xid, pTcon, fromName, toName,
1118 cifs_sb_source->local_nls,
1119 cifs_sb_source->mnt_cifs_flags &
1120 CIFS_MOUNT_MAP_SPECIAL_CHR);
1121 if (rc == -EEXIST) {
1122 /* check if they are the same file because rename of hardlinked
1123 files is a noop */
1124 FILE_UNIX_BASIC_INFO *info_buf_source;
1125 FILE_UNIX_BASIC_INFO *info_buf_target;
1126
1127 info_buf_source =
1128 kmalloc(2 * sizeof(FILE_UNIX_BASIC_INFO), GFP_KERNEL);
1129 if (info_buf_source != NULL) {
1130 info_buf_target = info_buf_source + 1;
1131 if (pTcon->unix_ext)
1132 rc = CIFSSMBUnixQPathInfo(xid, pTcon, fromName,
1133 info_buf_source,
1134 cifs_sb_source->local_nls,
1135 cifs_sb_source->mnt_cifs_flags &
1136 CIFS_MOUNT_MAP_SPECIAL_CHR);
1137 /* else rc is still EEXIST so will fall through to
1138 unlink the target and retry rename */
1139 if (rc == 0) {
1140 rc = CIFSSMBUnixQPathInfo(xid, pTcon, toName,
1141 info_buf_target,
1142 cifs_sb_target->local_nls,
1143 /* remap based on source sb */
1144 cifs_sb_source->mnt_cifs_flags &
1145 CIFS_MOUNT_MAP_SPECIAL_CHR);
1146 }
1147 if ((rc == 0) &&
1148 (info_buf_source->UniqueId ==
1149 info_buf_target->UniqueId)) {
1150 /* do not rename since the files are hardlinked which
1151 is a noop */
1152 } else {
1153 /* we either can not tell the files are hardlinked
1154 (as with Windows servers) or files are not
1155 hardlinked so delete the target manually before
1156 renaming to follow POSIX rather than Windows
1157 semantics */
1158 cifs_unlink(target_inode, target_direntry);
1159 rc = CIFSSMBRename(xid, pTcon, fromName,
1160 toName,
1161 cifs_sb_source->local_nls,
1162 cifs_sb_source->mnt_cifs_flags
1163 & CIFS_MOUNT_MAP_SPECIAL_CHR);
1164 }
1165 kfree(info_buf_source);
1166 } /* if we can not get memory just leave rc as EEXIST */
1167 }
1168
1169 if (rc)
1170 cFYI(1, ("rename rc %d", rc));
1171
1172 if ((rc == -EIO) || (rc == -EEXIST)) {
1173 int oplock = 0;
1174 __u16 netfid;
1175
1176 /* BB FIXME Is Generic Read correct for rename? */
1177 /* if renaming directory - we should not say CREATE_NOT_DIR,
1178 need to test renaming open directory, also GENERIC_READ
1179 might not right be right access to request */
1180 rc = CIFSSMBOpen(xid, pTcon, fromName, FILE_OPEN, GENERIC_READ,
1181 CREATE_NOT_DIR, &netfid, &oplock, NULL,
1182 cifs_sb_source->local_nls,
1183 cifs_sb_source->mnt_cifs_flags &
1184 CIFS_MOUNT_MAP_SPECIAL_CHR);
1185 if (rc == 0) {
1186 rc = CIFSSMBRenameOpenFile(xid, pTcon, netfid, toName,
1187 cifs_sb_source->local_nls,
1188 cifs_sb_source->mnt_cifs_flags &
1189 CIFS_MOUNT_MAP_SPECIAL_CHR);
1190 CIFSSMBClose(xid, pTcon, netfid);
1191 }
1192 }
1193
1194 cifs_rename_exit:
1195 kfree(fromName);
1196 kfree(toName);
1197 FreeXid(xid);
1198 return rc;
1199 }
1200
1201 int cifs_revalidate(struct dentry *direntry)
1202 {
1203 int xid;
1204 int rc = 0, wbrc = 0;
1205 char *full_path;
1206 struct cifs_sb_info *cifs_sb;
1207 struct cifsInodeInfo *cifsInode;
1208 loff_t local_size;
1209 struct timespec local_mtime;
1210 bool invalidate_inode = false;
1211
1212 if (direntry->d_inode == NULL)
1213 return -ENOENT;
1214
1215 cifsInode = CIFS_I(direntry->d_inode);
1216
1217 if (cifsInode == NULL)
1218 return -ENOENT;
1219
1220 /* no sense revalidating inode info on file that no one can write */
1221 if (CIFS_I(direntry->d_inode)->clientCanCacheRead)
1222 return rc;
1223
1224 xid = GetXid();
1225
1226 cifs_sb = CIFS_SB(direntry->d_sb);
1227
1228 /* can not safely grab the rename sem here if rename calls revalidate
1229 since that would deadlock */
1230 full_path = build_path_from_dentry(direntry);
1231 if (full_path == NULL) {
1232 FreeXid(xid);
1233 return -ENOMEM;
1234 }
1235 cFYI(1, ("Revalidate: %s inode 0x%p count %d dentry: 0x%p d_time %ld "
1236 "jiffies %ld", full_path, direntry->d_inode,
1237 direntry->d_inode->i_count.counter, direntry,
1238 direntry->d_time, jiffies));
1239
1240 if (cifsInode->time == 0) {
1241 /* was set to zero previously to force revalidate */
1242 } else if (time_before(jiffies, cifsInode->time + HZ) &&
1243 lookupCacheEnabled) {
1244 if ((S_ISREG(direntry->d_inode->i_mode) == 0) ||
1245 (direntry->d_inode->i_nlink == 1)) {
1246 kfree(full_path);
1247 FreeXid(xid);
1248 return rc;
1249 } else {
1250 cFYI(1, ("Have to revalidate file due to hardlinks"));
1251 }
1252 }
1253
1254 /* save mtime and size */
1255 local_mtime = direntry->d_inode->i_mtime;
1256 local_size = direntry->d_inode->i_size;
1257
1258 if (cifs_sb->tcon->unix_ext) {
1259 rc = cifs_get_inode_info_unix(&direntry->d_inode, full_path,
1260 direntry->d_sb, xid);
1261 if (rc) {
1262 cFYI(1, ("error on getting revalidate info %d", rc));
1263 /* if (rc != -ENOENT)
1264 rc = 0; */ /* BB should we cache info on
1265 certain errors? */
1266 }
1267 } else {
1268 rc = cifs_get_inode_info(&direntry->d_inode, full_path, NULL,
1269 direntry->d_sb, xid, NULL);
1270 if (rc) {
1271 cFYI(1, ("error on getting revalidate info %d", rc));
1272 /* if (rc != -ENOENT)
1273 rc = 0; */ /* BB should we cache info on
1274 certain errors? */
1275 }
1276 }
1277 /* should we remap certain errors, access denied?, to zero */
1278
1279 /* if not oplocked, we invalidate inode pages if mtime or file size
1280 had changed on server */
1281
1282 if (timespec_equal(&local_mtime, &direntry->d_inode->i_mtime) &&
1283 (local_size == direntry->d_inode->i_size)) {
1284 cFYI(1, ("cifs_revalidate - inode unchanged"));
1285 } else {
1286 /* file may have changed on server */
1287 if (cifsInode->clientCanCacheRead) {
1288 /* no need to invalidate inode pages since we were the
1289 only ones who could have modified the file and the
1290 server copy is staler than ours */
1291 } else {
1292 invalidate_inode = true;
1293 }
1294 }
1295
1296 /* can not grab this sem since kernel filesys locking documentation
1297 indicates i_mutex may be taken by the kernel on lookup and rename
1298 which could deadlock if we grab the i_mutex here as well */
1299 /* mutex_lock(&direntry->d_inode->i_mutex);*/
1300 /* need to write out dirty pages here */
1301 if (direntry->d_inode->i_mapping) {
1302 /* do we need to lock inode until after invalidate completes
1303 below? */
1304 wbrc = filemap_fdatawrite(direntry->d_inode->i_mapping);
1305 if (wbrc)
1306 CIFS_I(direntry->d_inode)->write_behind_rc = wbrc;
1307 }
1308 if (invalidate_inode) {
1309 /* shrink_dcache not necessary now that cifs dentry ops
1310 are exported for negative dentries */
1311 /* if (S_ISDIR(direntry->d_inode->i_mode))
1312 shrink_dcache_parent(direntry); */
1313 if (S_ISREG(direntry->d_inode->i_mode)) {
1314 if (direntry->d_inode->i_mapping)
1315 wbrc = filemap_fdatawait(direntry->d_inode->i_mapping);
1316 if (wbrc)
1317 CIFS_I(direntry->d_inode)->write_behind_rc = wbrc;
1318 /* may eventually have to do this for open files too */
1319 if (list_empty(&(cifsInode->openFileList))) {
1320 /* changed on server - flush read ahead pages */
1321 cFYI(1, ("Invalidating read ahead data on "
1322 "closed file"));
1323 invalidate_remote_inode(direntry->d_inode);
1324 }
1325 }
1326 }
1327 /* mutex_unlock(&direntry->d_inode->i_mutex); */
1328
1329 kfree(full_path);
1330 FreeXid(xid);
1331 return rc;
1332 }
1333
1334 int cifs_getattr(struct vfsmount *mnt, struct dentry *dentry,
1335 struct kstat *stat)
1336 {
1337 int err = cifs_revalidate(dentry);
1338 if (!err) {
1339 generic_fillattr(dentry->d_inode, stat);
1340 stat->blksize = CIFS_MAX_MSGSIZE;
1341 }
1342 return err;
1343 }
1344
1345 static int cifs_truncate_page(struct address_space *mapping, loff_t from)
1346 {
1347 pgoff_t index = from >> PAGE_CACHE_SHIFT;
1348 unsigned offset = from & (PAGE_CACHE_SIZE - 1);
1349 struct page *page;
1350 int rc = 0;
1351
1352 page = grab_cache_page(mapping, index);
1353 if (!page)
1354 return -ENOMEM;
1355
1356 zero_user_segment(page, offset, PAGE_CACHE_SIZE);
1357 unlock_page(page);
1358 page_cache_release(page);
1359 return rc;
1360 }
1361
1362 static int cifs_vmtruncate(struct inode *inode, loff_t offset)
1363 {
1364 struct address_space *mapping = inode->i_mapping;
1365 unsigned long limit;
1366
1367 spin_lock(&inode->i_lock);
1368 if (inode->i_size < offset)
1369 goto do_expand;
1370 /*
1371 * truncation of in-use swapfiles is disallowed - it would cause
1372 * subsequent swapout to scribble on the now-freed blocks.
1373 */
1374 if (IS_SWAPFILE(inode)) {
1375 spin_unlock(&inode->i_lock);
1376 goto out_busy;
1377 }
1378 i_size_write(inode, offset);
1379 spin_unlock(&inode->i_lock);
1380 /*
1381 * unmap_mapping_range is called twice, first simply for efficiency
1382 * so that truncate_inode_pages does fewer single-page unmaps. However
1383 * after this first call, and before truncate_inode_pages finishes,
1384 * it is possible for private pages to be COWed, which remain after
1385 * truncate_inode_pages finishes, hence the second unmap_mapping_range
1386 * call must be made for correctness.
1387 */
1388 unmap_mapping_range(mapping, offset + PAGE_SIZE - 1, 0, 1);
1389 truncate_inode_pages(mapping, offset);
1390 unmap_mapping_range(mapping, offset + PAGE_SIZE - 1, 0, 1);
1391 goto out_truncate;
1392
1393 do_expand:
1394 limit = current->signal->rlim[RLIMIT_FSIZE].rlim_cur;
1395 if (limit != RLIM_INFINITY && offset > limit) {
1396 spin_unlock(&inode->i_lock);
1397 goto out_sig;
1398 }
1399 if (offset > inode->i_sb->s_maxbytes) {
1400 spin_unlock(&inode->i_lock);
1401 goto out_big;
1402 }
1403 i_size_write(inode, offset);
1404 spin_unlock(&inode->i_lock);
1405 out_truncate:
1406 if (inode->i_op && inode->i_op->truncate)
1407 inode->i_op->truncate(inode);
1408 return 0;
1409 out_sig:
1410 send_sig(SIGXFSZ, current, 0);
1411 out_big:
1412 return -EFBIG;
1413 out_busy:
1414 return -ETXTBSY;
1415 }
1416
1417 int cifs_setattr(struct dentry *direntry, struct iattr *attrs)
1418 {
1419 int xid;
1420 struct cifs_sb_info *cifs_sb;
1421 struct cifsTconInfo *pTcon;
1422 char *full_path = NULL;
1423 int rc = -EACCES;
1424 struct cifsFileInfo *open_file = NULL;
1425 FILE_BASIC_INFO time_buf;
1426 bool set_time = false;
1427 bool set_dosattr = false;
1428 __u64 mode = 0xFFFFFFFFFFFFFFFFULL;
1429 __u64 uid = 0xFFFFFFFFFFFFFFFFULL;
1430 __u64 gid = 0xFFFFFFFFFFFFFFFFULL;
1431 struct cifsInodeInfo *cifsInode;
1432 struct inode *inode = direntry->d_inode;
1433
1434 xid = GetXid();
1435
1436 cFYI(1, ("setattr on file %s attrs->iavalid 0x%x",
1437 direntry->d_name.name, attrs->ia_valid));
1438
1439 cifs_sb = CIFS_SB(inode->i_sb);
1440 pTcon = cifs_sb->tcon;
1441
1442 if ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_PERM) == 0) {
1443 /* check if we have permission to change attrs */
1444 rc = inode_change_ok(inode, attrs);
1445 if (rc < 0) {
1446 FreeXid(xid);
1447 return rc;
1448 } else
1449 rc = 0;
1450 }
1451
1452 full_path = build_path_from_dentry(direntry);
1453 if (full_path == NULL) {
1454 FreeXid(xid);
1455 return -ENOMEM;
1456 }
1457 cifsInode = CIFS_I(inode);
1458
1459 if ((attrs->ia_valid & ATTR_MTIME) || (attrs->ia_valid & ATTR_SIZE)) {
1460 /*
1461 Flush data before changing file size or changing the last
1462 write time of the file on the server. If the
1463 flush returns error, store it to report later and continue.
1464 BB: This should be smarter. Why bother flushing pages that
1465 will be truncated anyway? Also, should we error out here if
1466 the flush returns error?
1467 */
1468 rc = filemap_write_and_wait(inode->i_mapping);
1469 if (rc != 0) {
1470 cifsInode->write_behind_rc = rc;
1471 rc = 0;
1472 }
1473 }
1474
1475 if (attrs->ia_valid & ATTR_SIZE) {
1476 /* To avoid spurious oplock breaks from server, in the case of
1477 inodes that we already have open, avoid doing path based
1478 setting of file size if we can do it by handle.
1479 This keeps our caching token (oplock) and avoids timeouts
1480 when the local oplock break takes longer to flush
1481 writebehind data than the SMB timeout for the SetPathInfo
1482 request would allow */
1483
1484 open_file = find_writable_file(cifsInode);
1485 if (open_file) {
1486 __u16 nfid = open_file->netfid;
1487 __u32 npid = open_file->pid;
1488 rc = CIFSSMBSetFileSize(xid, pTcon, attrs->ia_size,
1489 nfid, npid, false);
1490 atomic_dec(&open_file->wrtPending);
1491 cFYI(1, ("SetFSize for attrs rc = %d", rc));
1492 if ((rc == -EINVAL) || (rc == -EOPNOTSUPP)) {
1493 unsigned int bytes_written;
1494 rc = CIFSSMBWrite(xid, pTcon,
1495 nfid, 0, attrs->ia_size,
1496 &bytes_written, NULL, NULL,
1497 1 /* 45 seconds */);
1498 cFYI(1, ("Wrt seteof rc %d", rc));
1499 }
1500 } else
1501 rc = -EINVAL;
1502
1503 if (rc != 0) {
1504 /* Set file size by pathname rather than by handle
1505 either because no valid, writeable file handle for
1506 it was found or because there was an error setting
1507 it by handle */
1508 rc = CIFSSMBSetEOF(xid, pTcon, full_path,
1509 attrs->ia_size, false,
1510 cifs_sb->local_nls,
1511 cifs_sb->mnt_cifs_flags &
1512 CIFS_MOUNT_MAP_SPECIAL_CHR);
1513 cFYI(1, ("SetEOF by path (setattrs) rc = %d", rc));
1514 if ((rc == -EINVAL) || (rc == -EOPNOTSUPP)) {
1515 __u16 netfid;
1516 int oplock = 0;
1517
1518 rc = SMBLegacyOpen(xid, pTcon, full_path,
1519 FILE_OPEN, GENERIC_WRITE,
1520 CREATE_NOT_DIR, &netfid, &oplock,
1521 NULL, cifs_sb->local_nls,
1522 cifs_sb->mnt_cifs_flags &
1523 CIFS_MOUNT_MAP_SPECIAL_CHR);
1524 if (rc == 0) {
1525 unsigned int bytes_written;
1526 rc = CIFSSMBWrite(xid, pTcon,
1527 netfid, 0,
1528 attrs->ia_size,
1529 &bytes_written, NULL,
1530 NULL, 1 /* 45 sec */);
1531 cFYI(1, ("wrt seteof rc %d", rc));
1532 CIFSSMBClose(xid, pTcon, netfid);
1533 }
1534
1535 }
1536 }
1537
1538 /* Server is ok setting allocation size implicitly - no need
1539 to call:
1540 CIFSSMBSetEOF(xid, pTcon, full_path, attrs->ia_size, true,
1541 cifs_sb->local_nls);
1542 */
1543
1544 if (rc == 0) {
1545 rc = cifs_vmtruncate(inode, attrs->ia_size);
1546 cifs_truncate_page(inode->i_mapping, inode->i_size);
1547 } else
1548 goto cifs_setattr_exit;
1549 }
1550 if (attrs->ia_valid & ATTR_UID) {
1551 cFYI(1, ("UID changed to %d", attrs->ia_uid));
1552 uid = attrs->ia_uid;
1553 }
1554 if (attrs->ia_valid & ATTR_GID) {
1555 cFYI(1, ("GID changed to %d", attrs->ia_gid));
1556 gid = attrs->ia_gid;
1557 }
1558
1559 time_buf.Attributes = 0;
1560
1561 /* skip mode change if it's just for clearing setuid/setgid */
1562 if (attrs->ia_valid & (ATTR_KILL_SUID|ATTR_KILL_SGID))
1563 attrs->ia_valid &= ~ATTR_MODE;
1564
1565 if (attrs->ia_valid & ATTR_MODE) {
1566 cFYI(1, ("Mode changed to 0x%x", attrs->ia_mode));
1567 mode = attrs->ia_mode;
1568 }
1569
1570 if ((pTcon->unix_ext)
1571 && (attrs->ia_valid & (ATTR_MODE | ATTR_GID | ATTR_UID)))
1572 rc = CIFSSMBUnixSetPerms(xid, pTcon, full_path, mode, uid, gid,
1573 0 /* dev_t */, cifs_sb->local_nls,
1574 cifs_sb->mnt_cifs_flags &
1575 CIFS_MOUNT_MAP_SPECIAL_CHR);
1576 else if (attrs->ia_valid & ATTR_MODE) {
1577 rc = 0;
1578 #ifdef CONFIG_CIFS_EXPERIMENTAL
1579 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_CIFS_ACL)
1580 rc = mode_to_acl(inode, full_path, mode);
1581 else if ((mode & S_IWUGO) == 0) {
1582 #else
1583 if ((mode & S_IWUGO) == 0) {
1584 #endif
1585 /* not writeable */
1586 if ((cifsInode->cifsAttrs & ATTR_READONLY) == 0) {
1587 set_dosattr = true;
1588 time_buf.Attributes =
1589 cpu_to_le32(cifsInode->cifsAttrs |
1590 ATTR_READONLY);
1591 }
1592 } else if (cifsInode->cifsAttrs & ATTR_READONLY) {
1593 /* If file is readonly on server, we would
1594 not be able to write to it - so if any write
1595 bit is enabled for user or group or other we
1596 need to at least try to remove r/o dos attr */
1597 set_dosattr = true;
1598 time_buf.Attributes = cpu_to_le32(cifsInode->cifsAttrs &
1599 (~ATTR_READONLY));
1600 /* Windows ignores set to zero */
1601 if (time_buf.Attributes == 0)
1602 time_buf.Attributes |= cpu_to_le32(ATTR_NORMAL);
1603 }
1604 }
1605
1606 if (attrs->ia_valid & ATTR_ATIME) {
1607 set_time = true;
1608 time_buf.LastAccessTime =
1609 cpu_to_le64(cifs_UnixTimeToNT(attrs->ia_atime));
1610 } else
1611 time_buf.LastAccessTime = 0;
1612
1613 if (attrs->ia_valid & ATTR_MTIME) {
1614 set_time = true;
1615 time_buf.LastWriteTime =
1616 cpu_to_le64(cifs_UnixTimeToNT(attrs->ia_mtime));
1617 } else
1618 time_buf.LastWriteTime = 0;
1619 /* Do not set ctime explicitly unless other time
1620 stamps are changed explicitly (i.e. by utime()
1621 since we would then have a mix of client and
1622 server times */
1623
1624 if (set_time && (attrs->ia_valid & ATTR_CTIME)) {
1625 set_time = true;
1626 /* Although Samba throws this field away
1627 it may be useful to Windows - but we do
1628 not want to set ctime unless some other
1629 timestamp is changing */
1630 cFYI(1, ("CIFS - CTIME changed"));
1631 time_buf.ChangeTime =
1632 cpu_to_le64(cifs_UnixTimeToNT(attrs->ia_ctime));
1633 } else
1634 time_buf.ChangeTime = 0;
1635
1636 if (set_time || set_dosattr) {
1637 time_buf.CreationTime = 0; /* do not change */
1638 /* In the future we should experiment - try setting timestamps
1639 via Handle (SetFileInfo) instead of by path */
1640 if (!(pTcon->ses->flags & CIFS_SES_NT4))
1641 rc = CIFSSMBSetTimes(xid, pTcon, full_path, &time_buf,
1642 cifs_sb->local_nls,
1643 cifs_sb->mnt_cifs_flags &
1644 CIFS_MOUNT_MAP_SPECIAL_CHR);
1645 else
1646 rc = -EOPNOTSUPP;
1647
1648 if (rc == -EOPNOTSUPP) {
1649 int oplock = 0;
1650 __u16 netfid;
1651
1652 cFYI(1, ("calling SetFileInfo since SetPathInfo for "
1653 "times not supported by this server"));
1654 /* BB we could scan to see if we already have it open
1655 and pass in pid of opener to function */
1656 rc = CIFSSMBOpen(xid, pTcon, full_path, FILE_OPEN,
1657 SYNCHRONIZE | FILE_WRITE_ATTRIBUTES,
1658 CREATE_NOT_DIR, &netfid, &oplock,
1659 NULL, cifs_sb->local_nls,
1660 cifs_sb->mnt_cifs_flags &
1661 CIFS_MOUNT_MAP_SPECIAL_CHR);
1662 if (rc == 0) {
1663 rc = CIFSSMBSetFileTimes(xid, pTcon, &time_buf,
1664 netfid);
1665 CIFSSMBClose(xid, pTcon, netfid);
1666 } else {
1667 /* BB For even older servers we could convert time_buf
1668 into old DOS style which uses two second
1669 granularity */
1670
1671 /* rc = CIFSSMBSetTimesLegacy(xid, pTcon, full_path,
1672 &time_buf, cifs_sb->local_nls); */
1673 }
1674 }
1675 /* Even if error on time set, no sense failing the call if
1676 the server would set the time to a reasonable value anyway,
1677 and this check ensures that we are not being called from
1678 sys_utimes in which case we ought to fail the call back to
1679 the user when the server rejects the call */
1680 if ((rc) && (attrs->ia_valid &
1681 (ATTR_MODE | ATTR_GID | ATTR_UID | ATTR_SIZE)))
1682 rc = 0;
1683 }
1684
1685 /* do not need local check to inode_check_ok since the server does
1686 that */
1687 if (!rc)
1688 rc = inode_setattr(inode, attrs);
1689 cifs_setattr_exit:
1690 kfree(full_path);
1691 FreeXid(xid);
1692 return rc;
1693 }
1694
1695 #if 0
1696 void cifs_delete_inode(struct inode *inode)
1697 {
1698 cFYI(1, ("In cifs_delete_inode, inode = 0x%p", inode));
1699 /* may have to add back in if and when safe distributed caching of
1700 directories added e.g. via FindNotify */
1701 }
1702 #endif
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