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Merge with /pub/scm/linux/kernel/git/torvalds/linux-2.6.git
[mirror_ubuntu-zesty-kernel.git] / fs / cifs / inode.c
CommitLineData
1da177e4
LT		 1/*
2 * fs/cifs/inode.c
3 *
4 * Copyright (C) International Business Machines Corp., 2002,2005
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/buffer_head.h>
23#include <linux/stat.h>
24#include <linux/pagemap.h>
25#include <asm/div64.h>
26#include "cifsfs.h"
27#include "cifspdu.h"
28#include "cifsglob.h"
29#include "cifsproto.h"
30#include "cifs_debug.h"
31#include "cifs_fs_sb.h"
32
33int cifs_get_inode_info_unix(struct inode **pinode,
34 const unsigned char *search_path, struct super_block *sb, int xid)
35{
36 int rc = 0;
37 FILE_UNIX_BASIC_INFO findData;
38 struct cifsTconInfo *pTcon;
39 struct inode *inode;
40 struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
41 char *tmp_path;
42
43 pTcon = cifs_sb->tcon;
3020a1f5 44 cFYI(1, ("Getting info on %s ", search_path));
1da177e4
LT		 45 /* could have done a find first instead but this returns more info */
46 rc = CIFSSMBUnixQPathInfo(xid, pTcon, search_path, &findData,
737b758c
SF		 47 cifs_sb->local_nls, cifs_sb->mnt_cifs_flags &
48 CIFS_MOUNT_MAP_SPECIAL_CHR);
1da177e4
LT		 49/* dump_mem("\nUnixQPathInfo return data", &findData,
50 sizeof(findData)); */
51 if (rc) {
52 if (rc == -EREMOTE) {
53 tmp_path =
54 kmalloc(strnlen(pTcon->treeName,
55 MAX_TREE_SIZE + 1) +
56 strnlen(search_path, MAX_PATHCONF) + 1,
57 GFP_KERNEL);
58 if (tmp_path == NULL) {
59 return -ENOMEM;
60 }
61 /* have to skip first of the double backslash of
62 UNC name */
63 strncpy(tmp_path, pTcon->treeName, MAX_TREE_SIZE);
64 strncat(tmp_path, search_path, MAX_PATHCONF);
65 rc = connect_to_dfs_path(xid, pTcon->ses,
66 /* treename + */ tmp_path,
737b758c
SF		 67 cifs_sb->local_nls,
68 cifs_sb->mnt_cifs_flags &
69 CIFS_MOUNT_MAP_SPECIAL_CHR);
1da177e4
LT		 70 kfree(tmp_path);
71
72 /* BB fix up inode etc. */
73 } else if (rc) {
74 return rc;
75 }
76 } else {
77 struct cifsInodeInfo *cifsInfo;
78 __u32 type = le32_to_cpu(findData.Type);
79 __u64 num_of_bytes = le64_to_cpu(findData.NumOfBytes);
80 __u64 end_of_file = le64_to_cpu(findData.EndOfFile);
81
82 /* get new inode */
83 if (*pinode == NULL) {
84 *pinode = new_inode(sb);
d0d2f2df 85 if (*pinode == NULL)
1da177e4
LT		 86 return -ENOMEM;
87 /* Is an i_ino of zero legal? */
88 /* Are there sanity checks we can use to ensure that
89 the server is really filling in that field? */
d0d2f2df 90 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM) {
1da177e4
LT		 91 (*pinode)->i_ino =
92 (unsigned long)findData.UniqueId;
93 } /* note ino incremented to unique num in new_inode */
94 insert_inode_hash(*pinode);
95 }
96
97 inode = *pinode;
98 cifsInfo = CIFS_I(inode);
99
d6e2f2a4 100 cFYI(1, ("Old time %ld ", cifsInfo->time));
1da177e4 101 cifsInfo->time = jiffies;
d6e2f2a4 102 cFYI(1, ("New time %ld ", cifsInfo->time));
1da177e4
LT		 103 /* this is ok to set on every inode revalidate */
104 atomic_set(&cifsInfo->inUse,1);
105
106 inode->i_atime =
107 cifs_NTtimeToUnix(le64_to_cpu(findData.LastAccessTime));
108 inode->i_mtime =
109 cifs_NTtimeToUnix(le64_to_cpu
110 (findData.LastModificationTime));
111 inode->i_ctime =
112 cifs_NTtimeToUnix(le64_to_cpu(findData.LastStatusChange));
113 inode->i_mode = le64_to_cpu(findData.Permissions);
3020a1f5
SF		 114 /* since we set the inode type below we need to mask off
115 to avoid strange results if bits set above */
116 inode->i_mode &= ~S_IFMT;
1da177e4
LT		 117 if (type == UNIX_FILE) {
118 inode->i_mode |= S_IFREG;
119 } else if (type == UNIX_SYMLINK) {
120 inode->i_mode |= S_IFLNK;
121 } else if (type == UNIX_DIR) {
122 inode->i_mode |= S_IFDIR;
123 } else if (type == UNIX_CHARDEV) {
124 inode->i_mode |= S_IFCHR;
125 inode->i_rdev = MKDEV(le64_to_cpu(findData.DevMajor),
126 le64_to_cpu(findData.DevMinor) & MINORMASK);
127 } else if (type == UNIX_BLOCKDEV) {
128 inode->i_mode |= S_IFBLK;
129 inode->i_rdev = MKDEV(le64_to_cpu(findData.DevMajor),
130 le64_to_cpu(findData.DevMinor) & MINORMASK);
131 } else if (type == UNIX_FIFO) {
132 inode->i_mode |= S_IFIFO;
133 } else if (type == UNIX_SOCKET) {
134 inode->i_mode |= S_IFSOCK;
3020a1f5
SF		 135 } else {
136 /* safest to call it a file if we do not know */
137 inode->i_mode |= S_IFREG;
138 cFYI(1,("unknown type %d",type));
1da177e4
LT		 139 }
140 inode->i_uid = le64_to_cpu(findData.Uid);
141 inode->i_gid = le64_to_cpu(findData.Gid);
142 inode->i_nlink = le64_to_cpu(findData.Nlinks);
143
d0d2f2df 144 if (is_size_safe_to_change(cifsInfo)) {
1da177e4
LT		 145 /* can not safely change the file size here if the
146 client is writing to it due to potential races */
147
148 i_size_write(inode, end_of_file);
149
150 /* blksize needs to be multiple of two. So safer to default to
151 blksize and blkbits set in superblock so 2**blkbits and blksize
152 will match rather than setting to:
153 (pTcon->ses->server->maxBuf - MAX_CIFS_HDR_SIZE) & 0xFFFFFE00;*/
154
155 /* This seems incredibly stupid but it turns out that i_blocks
156 is not related to (i_size / i_blksize), instead 512 byte size
157 is required for calculating num blocks */
158
159 /* 512 bytes (2**9) is the fake blocksize that must be used */
160 /* for this calculation */
161 inode->i_blocks = (512 - 1 + num_of_bytes) >> 9;
162 }
163
164 if (num_of_bytes < end_of_file)
8b94bcb9 165 cFYI(1, ("allocation size less than end of file"));
1da177e4
LT		 166 cFYI(1,
167 ("Size %ld and blocks %ld",
168 (unsigned long) inode->i_size, inode->i_blocks));
169 if (S_ISREG(inode->i_mode)) {
8b94bcb9 170 cFYI(1, ("File inode"));
1da177e4 171 inode->i_op = &cifs_file_inode_ops;
8b94bcb9
SF		 172 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DIRECT_IO) {
173 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_BRL)
174 inode->i_fop =
175 &cifs_file_direct_nobrl_ops;
176 else
177 inode->i_fop = &cifs_file_direct_ops;
178 } else if(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_BRL)
179 inode->i_fop = &cifs_file_nobrl_ops;
180 else /* not direct, send byte range locks */
1da177e4 181 inode->i_fop = &cifs_file_ops;
8b94bcb9 182
1da177e4 183 inode->i_data.a_ops = &cifs_addr_ops;
bfa0d75a
SF		 184 /* check if server can support readpages */
185 if(pTcon->ses->server->maxBuf <
186 4096 + MAX_CIFS_HDR_SIZE)
187 inode->i_data.a_ops->readpages = NULL;
1da177e4 188 } else if (S_ISDIR(inode->i_mode)) {
8b94bcb9 189 cFYI(1, ("Directory inode"));
1da177e4
LT		 190 inode->i_op = &cifs_dir_inode_ops;
191 inode->i_fop = &cifs_dir_ops;
192 } else if (S_ISLNK(inode->i_mode)) {
8b94bcb9 193 cFYI(1, ("Symbolic Link inode"));
1da177e4
LT		 194 inode->i_op = &cifs_symlink_inode_ops;
195 /* tmp_inode->i_fop = */ /* do not need to set to anything */
196 } else {
8b94bcb9 197 cFYI(1, ("Init special inode"));
1da177e4
LT		 198 init_special_inode(inode, inode->i_mode,
199 inode->i_rdev);
200 }
201 }
202 return rc;
203}
204
d6e2f2a4
SF		 205static int decode_sfu_inode(struct inode * inode, __u64 size,
206 const unsigned char *path,
207 struct cifs_sb_info *cifs_sb, int xid)
208{
209 int rc;
210 int oplock = FALSE;
211 __u16 netfid;
212 struct cifsTconInfo *pTcon = cifs_sb->tcon;
86c96b4b 213 char buf[24];
d6e2f2a4
SF		 214 unsigned int bytes_read;
215 char * pbuf;
216
217 pbuf = buf;
218
219 if(size == 0) {
220 inode->i_mode |= S_IFIFO;
221 return 0;
222 } else if (size < 8) {
223 return -EINVAL; /* EOPNOTSUPP? */
224 }
225
226 rc = CIFSSMBOpen(xid, pTcon, path, FILE_OPEN, GENERIC_READ,
227 CREATE_NOT_DIR, &netfid, &oplock, NULL,
228 cifs_sb->local_nls,
229 cifs_sb->mnt_cifs_flags &
230 CIFS_MOUNT_MAP_SPECIAL_CHR);
231 if (rc==0) {
232 /* Read header */
233 rc = CIFSSMBRead(xid, pTcon,
234 netfid,
86c96b4b 235 24 /* length */, 0 /* offset */,
d6e2f2a4 236 &bytes_read, &pbuf);
86c96b4b 237 if((rc == 0) && (bytes_read >= 8)) {
9e294f1c
SF		 238 if(memcmp("IntxBLK", pbuf, 8) == 0) {
239 cFYI(1,("Block device"));
3020a1f5 240 inode->i_mode |= S_IFBLK;
86c96b4b
SF		 241 if(bytes_read == 24) {
242 /* we have enough to decode dev num */
243 __u64 mjr; /* major */
244 __u64 mnr; /* minor */
245 mjr = le64_to_cpu(*(__le64 *)(pbuf+8));
246 mnr = le64_to_cpu(*(__le64 *)(pbuf+16));
247 inode->i_rdev = MKDEV(mjr, mnr);
248 }
9e294f1c
SF		 249 } else if(memcmp("IntxCHR", pbuf, 8) == 0) {
250 cFYI(1,("Char device"));
3020a1f5 251 inode->i_mode |= S_IFCHR;
86c96b4b
SF		 252 if(bytes_read == 24) {
253 /* we have enough to decode dev num */
254 __u64 mjr; /* major */
255 __u64 mnr; /* minor */
256 mjr = le64_to_cpu(*(__le64 *)(pbuf+8));
257 mnr = le64_to_cpu(*(__le64 *)(pbuf+16));
258 inode->i_rdev = MKDEV(mjr, mnr);
259 }
9e294f1c
SF		 260 } else if(memcmp("IntxLNK", pbuf, 7) == 0) {
261 cFYI(1,("Symlink"));
3020a1f5 262 inode->i_mode |= S_IFLNK;
86c96b4b
SF		 263 } else {
264 inode->i_mode |= S_IFREG; /* file? */
265 rc = -EOPNOTSUPP;
266 }
3020a1f5
SF		 267 } else {
268 inode->i_mode |= S_IFREG; /* then it is a file */
269 rc = -EOPNOTSUPP; /* or some unknown SFU type */
d6e2f2a4 270 }
d6e2f2a4 271 CIFSSMBClose(xid, pTcon, netfid);
d6e2f2a4
SF		 272 }
273 return rc;
274
275}
276
9e294f1c
SF		 277#define SFBITS_MASK (S_ISVTX | S_ISGID | S_ISUID) /* SETFILEBITS valid bits */
278
279static int get_sfu_uid_mode(struct inode * inode,
280 const unsigned char *path,
281 struct cifs_sb_info *cifs_sb, int xid)
282{
3020a1f5 283#ifdef CONFIG_CIFS_XATTR
9e294f1c
SF		 284 ssize_t rc;
285 char ea_value[4];
286 __u32 mode;
287
288 rc = CIFSSMBQueryEA(xid, cifs_sb->tcon, path, "SETFILEBITS",
289 ea_value, 4 /* size of buf */, cifs_sb->local_nls,
290 cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR);
291 if(rc < 0)
292 return (int)rc;
293 else if (rc > 3) {
294 mode = le32_to_cpu(*((__le32 *)ea_value));
c119b87d 295 inode->i_mode &= ~SFBITS_MASK;
3020a1f5 296 cFYI(1,("special bits 0%o org mode 0%o", mode, inode->i_mode));
9e294f1c
SF		 297 inode->i_mode = (mode & SFBITS_MASK) | inode->i_mode;
298 cFYI(1,("special mode bits 0%o", mode));
299 return 0;
300 } else {
301 return 0;
302 }
3020a1f5
SF		 303#else
304 return -EOPNOTSUPP;
305#endif
306
9e294f1c
SF		 307
308}
309
1da177e4
LT		 310int cifs_get_inode_info(struct inode **pinode,
311 const unsigned char *search_path, FILE_ALL_INFO *pfindData,
312 struct super_block *sb, int xid)
313{
314 int rc = 0;
315 struct cifsTconInfo *pTcon;
316 struct inode *inode;
317 struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
318 char *tmp_path;
319 char *buf = NULL;
320
321 pTcon = cifs_sb->tcon;
d6e2f2a4 322 cFYI(1,("Getting info on %s", search_path));
1da177e4 323
d0d2f2df
SF		 324 if ((pfindData == NULL) && (*pinode != NULL)) {
325 if (CIFS_I(*pinode)->clientCanCacheRead) {
1da177e4
LT		 326 cFYI(1,("No need to revalidate cached inode sizes"));
327 return rc;
328 }
329 }
330
331 /* if file info not passed in then get it from server */
d0d2f2df 332 if (pfindData == NULL) {
1da177e4 333 buf = kmalloc(sizeof(FILE_ALL_INFO), GFP_KERNEL);
d0d2f2df 334 if (buf == NULL)
1da177e4
LT		 335 return -ENOMEM;
336 pfindData = (FILE_ALL_INFO *)buf;
337 /* could do find first instead but this returns more info */
338 rc = CIFSSMBQPathInfo(xid, pTcon, search_path, pfindData,
6b8edfe0 339 cifs_sb->local_nls, cifs_sb->mnt_cifs_flags &
737b758c 340 CIFS_MOUNT_MAP_SPECIAL_CHR);
6b8edfe0
SF		 341 /* BB optimize code so we do not make the above call
342 when server claims no NT SMB support and the above call
343 failed at least once - set flag in tcon or mount */
344 if((rc == -EOPNOTSUPP) || (rc == -EINVAL)) {
345 rc = SMBQueryInformation(xid, pTcon, search_path,
346 pfindData, cifs_sb->local_nls,
347 cifs_sb->mnt_cifs_flags &
348 CIFS_MOUNT_MAP_SPECIAL_CHR);
349 }
350
1da177e4
LT		 351 }
352 /* dump_mem("\nQPathInfo return data",&findData, sizeof(findData)); */
353 if (rc) {
354 if (rc == -EREMOTE) {
355 tmp_path =
356 kmalloc(strnlen
357 (pTcon->treeName,
358 MAX_TREE_SIZE + 1) +
359 strnlen(search_path, MAX_PATHCONF) + 1,
360 GFP_KERNEL);
361 if (tmp_path == NULL) {
362 kfree(buf);
363 return -ENOMEM;
364 }
365
366 strncpy(tmp_path, pTcon->treeName, MAX_TREE_SIZE);
367 strncat(tmp_path, search_path, MAX_PATHCONF);
368 rc = connect_to_dfs_path(xid, pTcon->ses,
369 /* treename + */ tmp_path,
737b758c
SF		 370 cifs_sb->local_nls,
371 cifs_sb->mnt_cifs_flags &
372 CIFS_MOUNT_MAP_SPECIAL_CHR);
1da177e4
LT		 373 kfree(tmp_path);
374 /* BB fix up inode etc. */
375 } else if (rc) {
376 kfree(buf);
377 return rc;
378 }
379 } else {
380 struct cifsInodeInfo *cifsInfo;
381 __u32 attr = le32_to_cpu(pfindData->Attributes);
382
383 /* get new inode */
384 if (*pinode == NULL) {
385 *pinode = new_inode(sb);
386 if (*pinode == NULL)
387 return -ENOMEM;
388 /* Is an i_ino of zero legal? Can we use that to check
389 if the server supports returning inode numbers? Are
390 there other sanity checks we can use to ensure that
391 the server is really filling in that field? */
392
393 /* We can not use the IndexNumber field by default from
394 Windows or Samba (in ALL_INFO buf) but we can request
395 it explicitly. It may not be unique presumably if
396 the server has multiple devices mounted under one
397 share */
398
399 /* There may be higher info levels that work but are
400 there Windows server or network appliances for which
401 IndexNumber field is not guaranteed unique? */
402
d0d2f2df 403 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM){
1da177e4
LT		 404 int rc1 = 0;
405 __u64 inode_num;
406
407 rc1 = CIFSGetSrvInodeNumber(xid, pTcon,
408 search_path, &inode_num,
737b758c
SF		 409 cifs_sb->local_nls,
410 cifs_sb->mnt_cifs_flags &
411 CIFS_MOUNT_MAP_SPECIAL_CHR);
d0d2f2df 412 if (rc1) {
1da177e4
LT		 413 cFYI(1,("GetSrvInodeNum rc %d", rc1));
414 /* BB EOPNOSUPP disable SERVER_INUM? */
415 } else /* do we need cast or hash to ino? */
416 (*pinode)->i_ino = inode_num;
417 } /* else ino incremented to unique num in new_inode*/
1da177e4
LT		 418 insert_inode_hash(*pinode);
419 }
420 inode = *pinode;
421 cifsInfo = CIFS_I(inode);
422 cifsInfo->cifsAttrs = attr;
3020a1f5 423 cFYI(1, ("Old time %ld ", cifsInfo->time));
1da177e4 424 cifsInfo->time = jiffies;
3020a1f5 425 cFYI(1, ("New time %ld ", cifsInfo->time));
1da177e4
LT		 426
427 /* blksize needs to be multiple of two. So safer to default to
428 blksize and blkbits set in superblock so 2**blkbits and blksize
429 will match rather than setting to:
430 (pTcon->ses->server->maxBuf - MAX_CIFS_HDR_SIZE) & 0xFFFFFE00;*/
431
432 /* Linux can not store file creation time unfortunately so we ignore it */
433 inode->i_atime =
434 cifs_NTtimeToUnix(le64_to_cpu(pfindData->LastAccessTime));
435 inode->i_mtime =
436 cifs_NTtimeToUnix(le64_to_cpu(pfindData->LastWriteTime));
437 inode->i_ctime =
438 cifs_NTtimeToUnix(le64_to_cpu(pfindData->ChangeTime));
3020a1f5 439 cFYI(0, ("Attributes came in as 0x%x ", attr));
1da177e4
LT		 440
441 /* set default mode. will override for dirs below */
442 if (atomic_read(&cifsInfo->inUse) == 0)
443 /* new inode, can safely set these fields */
444 inode->i_mode = cifs_sb->mnt_file_mode;
3020a1f5
SF		 445 else /* since we set the inode type below we need to mask off
446 to avoid strange results if type changes and both get orred in */
447 inode->i_mode &= ~S_IFMT;
1da177e4
LT		 448/* if (attr & ATTR_REPARSE) */
449 /* We no longer handle these as symlinks because we could not
450 follow them due to the absolute path with drive letter */
451 if (attr & ATTR_DIRECTORY) {
452 /* override default perms since we do not do byte range locking
453 on dirs */
454 inode->i_mode = cifs_sb->mnt_dir_mode;
455 inode->i_mode |= S_IFDIR;
eda3c029
SF		 456 } else if ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_UNX_EMUL) &&
457 (cifsInfo->cifsAttrs & ATTR_SYSTEM) &&
458 /* No need to le64 convert size of zero */
459 (pfindData->EndOfFile == 0)) {
460 inode->i_mode = cifs_sb->mnt_file_mode;
461 inode->i_mode |= S_IFIFO;
d6e2f2a4
SF		 462/* BB Finish for SFU style symlinks and devices */
463 } else if ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_UNX_EMUL) &&
464 (cifsInfo->cifsAttrs & ATTR_SYSTEM)) {
465 if (decode_sfu_inode(inode,
466 le64_to_cpu(pfindData->EndOfFile),
467 search_path,
468 cifs_sb, xid)) {
469 cFYI(1,("Unrecognized sfu inode type"));
470 }
3020a1f5 471 cFYI(1,("sfu mode 0%o",inode->i_mode));
1da177e4
LT		 472 } else {
473 inode->i_mode |= S_IFREG;
474 /* treat the dos attribute of read-only as read-only
475 mode e.g. 555 */
476 if (cifsInfo->cifsAttrs & ATTR_READONLY)
477 inode->i_mode &= ~(S_IWUGO);
478 /* BB add code here -
479 validate if device or weird share or device type? */
480 }
481 if (is_size_safe_to_change(cifsInfo)) {
482 /* can not safely change the file size here if the
483 client is writing to it due to potential races */
484 i_size_write(inode,le64_to_cpu(pfindData->EndOfFile));
485
486 /* 512 bytes (2**9) is the fake blocksize that must be
487 used for this calculation */
488 inode->i_blocks = (512 - 1 + le64_to_cpu(
489 pfindData->AllocationSize)) >> 9;
490 }
491
492 inode->i_nlink = le32_to_cpu(pfindData->NumberOfLinks);
493
494 /* BB fill in uid and gid here? with help from winbind?
495 or retrieve from NTFS stream extended attribute */
9e294f1c
SF		 496 if(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_UNX_EMUL) {
497 /* fill in uid, gid, mode from server ACL */
498 get_sfu_uid_mode(inode, search_path, cifs_sb, xid);
499 } else if (atomic_read(&cifsInfo->inUse) == 0) {
1da177e4
LT		 500 inode->i_uid = cifs_sb->mnt_uid;
501 inode->i_gid = cifs_sb->mnt_gid;
502 /* set so we do not keep refreshing these fields with
503 bad data after user has changed them in memory */
504 atomic_set(&cifsInfo->inUse,1);
505 }
506
507 if (S_ISREG(inode->i_mode)) {
d6e2f2a4 508 cFYI(1, ("File inode"));
1da177e4 509 inode->i_op = &cifs_file_inode_ops;
8b94bcb9
SF		 510 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DIRECT_IO) {
511 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_BRL)
512 inode->i_fop =
513 &cifs_file_direct_nobrl_ops;
514 else
515 inode->i_fop = &cifs_file_direct_ops;
516 } else if(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_BRL)
517 inode->i_fop = &cifs_file_nobrl_ops;
518 else /* not direct, send byte range locks */
1da177e4 519 inode->i_fop = &cifs_file_ops;
8b94bcb9 520
1da177e4 521 inode->i_data.a_ops = &cifs_addr_ops;
bfa0d75a
SF		 522 if(pTcon->ses->server->maxBuf <
523 4096 + MAX_CIFS_HDR_SIZE)
524 inode->i_data.a_ops->readpages = NULL;
1da177e4 525 } else if (S_ISDIR(inode->i_mode)) {
d6e2f2a4 526 cFYI(1, ("Directory inode"));
1da177e4
LT		 527 inode->i_op = &cifs_dir_inode_ops;
528 inode->i_fop = &cifs_dir_ops;
529 } else if (S_ISLNK(inode->i_mode)) {
d6e2f2a4 530 cFYI(1, ("Symbolic Link inode"));
1da177e4
LT		 531 inode->i_op = &cifs_symlink_inode_ops;
532 } else {
533 init_special_inode(inode, inode->i_mode,
534 inode->i_rdev);
535 }
536 }
537 kfree(buf);
538 return rc;
539}
540
541/* gets root inode */
542void cifs_read_inode(struct inode *inode)
543{
544 int xid;
545 struct cifs_sb_info *cifs_sb;
546
547 cifs_sb = CIFS_SB(inode->i_sb);
548 xid = GetXid();
549 if (cifs_sb->tcon->ses->capabilities & CAP_UNIX)
550 cifs_get_inode_info_unix(&inode, "", inode->i_sb,xid);
551 else
552 cifs_get_inode_info(&inode, "", NULL, inode->i_sb,xid);
553 /* can not call macro FreeXid here since in a void func */
554 _FreeXid(xid);
555}
556
557int cifs_unlink(struct inode *inode, struct dentry *direntry)
558{
559 int rc = 0;
560 int xid;
561 struct cifs_sb_info *cifs_sb;
562 struct cifsTconInfo *pTcon;
563 char *full_path = NULL;
564 struct cifsInodeInfo *cifsInode;
565 FILE_BASIC_INFO *pinfo_buf;
566
3020a1f5 567 cFYI(1, ("cifs_unlink, inode = 0x%p with ", inode));
1da177e4
LT		 568
569 xid = GetXid();
570
571 cifs_sb = CIFS_SB(inode->i_sb);
572 pTcon = cifs_sb->tcon;
573
574 /* Unlink can be called from rename so we can not grab the sem here
575 since we deadlock otherwise */
576/* down(&direntry->d_sb->s_vfs_rename_sem);*/
7f57356b 577 full_path = build_path_from_dentry(direntry);
1da177e4
LT		 578/* up(&direntry->d_sb->s_vfs_rename_sem);*/
579 if (full_path == NULL) {
580 FreeXid(xid);
581 return -ENOMEM;
582 }
737b758c
SF		 583 rc = CIFSSMBDelFile(xid, pTcon, full_path, cifs_sb->local_nls,
584 cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR);
1da177e4
LT		 585
586 if (!rc) {
d0d2f2df 587 if (direntry->d_inode)
b2aeb9d5 588 direntry->d_inode->i_nlink--;
1da177e4
LT		 589 } else if (rc == -ENOENT) {
590 d_drop(direntry);
591 } else if (rc == -ETXTBSY) {
592 int oplock = FALSE;
593 __u16 netfid;
594
595 rc = CIFSSMBOpen(xid, pTcon, full_path, FILE_OPEN, DELETE,
596 CREATE_NOT_DIR | CREATE_DELETE_ON_CLOSE,
737b758c
SF		 597 &netfid, &oplock, NULL, cifs_sb->local_nls,
598 cifs_sb->mnt_cifs_flags &
599 CIFS_MOUNT_MAP_SPECIAL_CHR);
1da177e4
LT		 600 if (rc==0) {
601 CIFSSMBRenameOpenFile(xid, pTcon, netfid, NULL,
737b758c
SF		 602 cifs_sb->local_nls,
603 cifs_sb->mnt_cifs_flags &
604 CIFS_MOUNT_MAP_SPECIAL_CHR);
1da177e4 605 CIFSSMBClose(xid, pTcon, netfid);
d0d2f2df 606 if (direntry->d_inode)
b2aeb9d5 607 direntry->d_inode->i_nlink--;
1da177e4
LT		 608 }
609 } else if (rc == -EACCES) {
610 /* try only if r/o attribute set in local lookup data? */
611 pinfo_buf = kmalloc(sizeof(FILE_BASIC_INFO), GFP_KERNEL);
612 if (pinfo_buf) {
613 memset(pinfo_buf, 0, sizeof(FILE_BASIC_INFO));
614 /* ATTRS set to normal clears r/o bit */
615 pinfo_buf->Attributes = cpu_to_le32(ATTR_NORMAL);
616 if (!(pTcon->ses->flags & CIFS_SES_NT4))
617 rc = CIFSSMBSetTimes(xid, pTcon, full_path,
618 pinfo_buf,
737b758c
SF		 619 cifs_sb->local_nls,
620 cifs_sb->mnt_cifs_flags &
621 CIFS_MOUNT_MAP_SPECIAL_CHR);
1da177e4
LT		 622 else
623 rc = -EOPNOTSUPP;
624
625 if (rc == -EOPNOTSUPP) {
626 int oplock = FALSE;
627 __u16 netfid;
628 /* rc = CIFSSMBSetAttrLegacy(xid, pTcon,
629 full_path,
630 (__u16)ATTR_NORMAL,
631 cifs_sb->local_nls);
632 For some strange reason it seems that NT4 eats the
633 old setattr call without actually setting the
634 attributes so on to the third attempted workaround
635 */
636
637 /* BB could scan to see if we already have it open
638 and pass in pid of opener to function */
639 rc = CIFSSMBOpen(xid, pTcon, full_path,
640 FILE_OPEN, SYNCHRONIZE |
641 FILE_WRITE_ATTRIBUTES, 0,
642 &netfid, &oplock, NULL,
737b758c
SF		 643 cifs_sb->local_nls,
644 cifs_sb->mnt_cifs_flags &
645 CIFS_MOUNT_MAP_SPECIAL_CHR);
1da177e4
LT		 646 if (rc==0) {
647 rc = CIFSSMBSetFileTimes(xid, pTcon,
648 pinfo_buf,
649 netfid);
650 CIFSSMBClose(xid, pTcon, netfid);
651 }
652 }
653 kfree(pinfo_buf);
654 }
655 if (rc==0) {
737b758c
SF		 656 rc = CIFSSMBDelFile(xid, pTcon, full_path,
657 cifs_sb->local_nls,
658 cifs_sb->mnt_cifs_flags &
659 CIFS_MOUNT_MAP_SPECIAL_CHR);
1da177e4 660 if (!rc) {
d0d2f2df 661 if (direntry->d_inode)
b2aeb9d5 662 direntry->d_inode->i_nlink--;
1da177e4
LT		 663 } else if (rc == -ETXTBSY) {
664 int oplock = FALSE;
665 __u16 netfid;
666
667 rc = CIFSSMBOpen(xid, pTcon, full_path,
668 FILE_OPEN, DELETE,
669 CREATE_NOT_DIR |
670 CREATE_DELETE_ON_CLOSE,
671 &netfid, &oplock, NULL,
737b758c
SF		 672 cifs_sb->local_nls,
673 cifs_sb->mnt_cifs_flags &
674 CIFS_MOUNT_MAP_SPECIAL_CHR);
1da177e4
LT		 675 if (rc==0) {
676 CIFSSMBRenameOpenFile(xid, pTcon,
677 netfid, NULL,
737b758c
SF		 678 cifs_sb->local_nls,
679 cifs_sb->mnt_cifs_flags &
680 CIFS_MOUNT_MAP_SPECIAL_CHR);
1da177e4 681 CIFSSMBClose(xid, pTcon, netfid);
d0d2f2df 682 if (direntry->d_inode)
b2aeb9d5 683 direntry->d_inode->i_nlink--;
1da177e4
LT		 684 }
685 /* BB if rc = -ETXTBUSY goto the rename logic BB */
686 }
687 }
688 }
d0d2f2df 689 if (direntry->d_inode) {
b2aeb9d5
SF		 690 cifsInode = CIFS_I(direntry->d_inode);
691 cifsInode->time = 0; /* will force revalidate to get info
692 when needed */
693 direntry->d_inode->i_ctime = current_fs_time(inode->i_sb);
694 }
695 inode->i_ctime = inode->i_mtime = current_fs_time(inode->i_sb);
1da177e4
LT		 696 cifsInode = CIFS_I(inode);
697 cifsInode->time = 0; /* force revalidate of dir as well */
698
699 kfree(full_path);
700 FreeXid(xid);
701 return rc;
702}
703
704int cifs_mkdir(struct inode *inode, struct dentry *direntry, int mode)
705{
706 int rc = 0;
707 int xid;
708 struct cifs_sb_info *cifs_sb;
709 struct cifsTconInfo *pTcon;
710 char *full_path = NULL;
711 struct inode *newinode = NULL;
712
6473a559 713 cFYI(1, ("In cifs_mkdir, mode = 0x%x inode = 0x%p", mode, inode));
1da177e4
LT		 714
715 xid = GetXid();
716
717 cifs_sb = CIFS_SB(inode->i_sb);
718 pTcon = cifs_sb->tcon;
719
720 down(&inode->i_sb->s_vfs_rename_sem);
7f57356b 721 full_path = build_path_from_dentry(direntry);
1da177e4
LT		 722 up(&inode->i_sb->s_vfs_rename_sem);
723 if (full_path == NULL) {
724 FreeXid(xid);
725 return -ENOMEM;
726 }
727 /* BB add setting the equivalent of mode via CreateX w/ACLs */
737b758c
SF		 728 rc = CIFSSMBMkDir(xid, pTcon, full_path, cifs_sb->local_nls,
729 cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR);
1da177e4
LT		 730 if (rc) {
731 cFYI(1, ("cifs_mkdir returned 0x%x ", rc));
732 d_drop(direntry);
733 } else {
734 inode->i_nlink++;
735 if (pTcon->ses->capabilities & CAP_UNIX)
736 rc = cifs_get_inode_info_unix(&newinode, full_path,
737 inode->i_sb,xid);
738 else
739 rc = cifs_get_inode_info(&newinode, full_path, NULL,
740 inode->i_sb,xid);
741
b92327fe
SF		 742 if (pTcon->nocase)
743 direntry->d_op = &cifs_ci_dentry_ops;
744 else
745 direntry->d_op = &cifs_dentry_ops;
1da177e4
LT		 746 d_instantiate(direntry, newinode);
747 if (direntry->d_inode)
748 direntry->d_inode->i_nlink = 2;
749 if (cifs_sb->tcon->ses->capabilities & CAP_UNIX)
d0d2f2df 750 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SET_UID) {
1da177e4
LT		 751 CIFSSMBUnixSetPerms(xid, pTcon, full_path,
752 mode,
753 (__u64)current->euid,
754 (__u64)current->egid,
755 0 /* dev_t */,
737b758c
SF		 756 cifs_sb->local_nls,
757 cifs_sb->mnt_cifs_flags &
758 CIFS_MOUNT_MAP_SPECIAL_CHR);
1da177e4
LT		 759 } else {
760 CIFSSMBUnixSetPerms(xid, pTcon, full_path,
761 mode, (__u64)-1,
762 (__u64)-1, 0 /* dev_t */,
737b758c
SF		 763 cifs_sb->local_nls,
764 cifs_sb->mnt_cifs_flags &
765 CIFS_MOUNT_MAP_SPECIAL_CHR);
1da177e4
LT		 766 }
767 else {
768 /* BB to be implemented via Windows secrty descriptors
769 eg CIFSSMBWinSetPerms(xid, pTcon, full_path, mode,
770 -1, -1, local_nls); */
6473a559
SF		 771 if(direntry->d_inode) {
772 direntry->d_inode->i_mode = mode;
773 if(cifs_sb->mnt_cifs_flags &
774 CIFS_MOUNT_SET_UID) {
775 direntry->d_inode->i_uid =
776 current->fsuid;
777 direntry->d_inode->i_gid =
778 current->fsgid;
779 }
780 }
1da177e4
LT		 781 }
782 kfree(full_path);
783 FreeXid(xid);
784 return rc;
785}
786
787int cifs_rmdir(struct inode *inode, struct dentry *direntry)
788{
789 int rc = 0;
790 int xid;
791 struct cifs_sb_info *cifs_sb;
792 struct cifsTconInfo *pTcon;
793 char *full_path = NULL;
794 struct cifsInodeInfo *cifsInode;
795
3020a1f5 796 cFYI(1, ("cifs_rmdir, inode = 0x%p with ", inode));
1da177e4
LT		 797
798 xid = GetXid();
799
800 cifs_sb = CIFS_SB(inode->i_sb);
801 pTcon = cifs_sb->tcon;
802
803 down(&inode->i_sb->s_vfs_rename_sem);
7f57356b 804 full_path = build_path_from_dentry(direntry);
1da177e4
LT		 805 up(&inode->i_sb->s_vfs_rename_sem);
806 if (full_path == NULL) {
807 FreeXid(xid);
808 return -ENOMEM;
809 }
810
737b758c
SF		 811 rc = CIFSSMBRmDir(xid, pTcon, full_path, cifs_sb->local_nls,
812 cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR);
1da177e4
LT		 813
814 if (!rc) {
815 inode->i_nlink--;
816 i_size_write(direntry->d_inode,0);
817 direntry->d_inode->i_nlink = 0;
818 }
819
820 cifsInode = CIFS_I(direntry->d_inode);
821 cifsInode->time = 0; /* force revalidate to go get info when
822 needed */
823 direntry->d_inode->i_ctime = inode->i_ctime = inode->i_mtime =
824 current_fs_time(inode->i_sb);
825
826 kfree(full_path);
827 FreeXid(xid);
828 return rc;
829}
830
831int cifs_rename(struct inode *source_inode, struct dentry *source_direntry,
832 struct inode *target_inode, struct dentry *target_direntry)
833{
834 char *fromName;
835 char *toName;
836 struct cifs_sb_info *cifs_sb_source;
837 struct cifs_sb_info *cifs_sb_target;
838 struct cifsTconInfo *pTcon;
839 int xid;
840 int rc = 0;
841
842 xid = GetXid();
843
844 cifs_sb_target = CIFS_SB(target_inode->i_sb);
845 cifs_sb_source = CIFS_SB(source_inode->i_sb);
846 pTcon = cifs_sb_source->tcon;
847
848 if (pTcon != cifs_sb_target->tcon) {
849 FreeXid(xid);
850 return -EXDEV; /* BB actually could be allowed if same server,
851 but different share.
852 Might eventually add support for this */
853 }
854
855 /* we already have the rename sem so we do not need to grab it again
856 here to protect the path integrity */
7f57356b
SF		 857 fromName = build_path_from_dentry(source_direntry);
858 toName = build_path_from_dentry(target_direntry);
1da177e4
LT		 859 if ((fromName == NULL) || (toName == NULL)) {
860 rc = -ENOMEM;
861 goto cifs_rename_exit;
862 }
863
864 rc = CIFSSMBRename(xid, pTcon, fromName, toName,
737b758c
SF		 865 cifs_sb_source->local_nls,
866 cifs_sb_source->mnt_cifs_flags &
867 CIFS_MOUNT_MAP_SPECIAL_CHR);
1da177e4
LT		 868 if (rc == -EEXIST) {
869 /* check if they are the same file because rename of hardlinked
870 files is a noop */
871 FILE_UNIX_BASIC_INFO *info_buf_source;
872 FILE_UNIX_BASIC_INFO *info_buf_target;
873
874 info_buf_source =
875 kmalloc(2 * sizeof(FILE_UNIX_BASIC_INFO), GFP_KERNEL);
876 if (info_buf_source != NULL) {
877 info_buf_target = info_buf_source + 1;
878 rc = CIFSSMBUnixQPathInfo(xid, pTcon, fromName,
737b758c
SF		 879 info_buf_source, cifs_sb_source->local_nls,
880 cifs_sb_source->mnt_cifs_flags &
881 CIFS_MOUNT_MAP_SPECIAL_CHR);
1da177e4
LT		 882 if (rc == 0) {
883 rc = CIFSSMBUnixQPathInfo(xid, pTcon, toName,
884 info_buf_target,
737b758c
SF		 885 cifs_sb_target->local_nls,
886 /* remap based on source sb */
887 cifs_sb_source->mnt_cifs_flags &
888 CIFS_MOUNT_MAP_SPECIAL_CHR);
1da177e4
LT		 889 }
890 if ((rc == 0) &&
891 (info_buf_source->UniqueId ==
892 info_buf_target->UniqueId)) {
893 /* do not rename since the files are hardlinked which
894 is a noop */
895 } else {
896 /* we either can not tell the files are hardlinked
897 (as with Windows servers) or files are not
898 hardlinked so delete the target manually before
899 renaming to follow POSIX rather than Windows
900 semantics */
901 cifs_unlink(target_inode, target_direntry);
902 rc = CIFSSMBRename(xid, pTcon, fromName,
903 toName,
737b758c
SF		 904 cifs_sb_source->local_nls,
905 cifs_sb_source->mnt_cifs_flags
906 & CIFS_MOUNT_MAP_SPECIAL_CHR);
1da177e4
LT		 907 }
908 kfree(info_buf_source);
909 } /* if we can not get memory just leave rc as EEXIST */
910 }
911
912 if (rc) {
913 cFYI(1, ("rename rc %d", rc));
914 }
915
916 if ((rc == -EIO) || (rc == -EEXIST)) {
917 int oplock = FALSE;
918 __u16 netfid;
919
920 /* BB FIXME Is Generic Read correct for rename? */
921 /* if renaming directory - we should not say CREATE_NOT_DIR,
922 need to test renaming open directory, also GENERIC_READ
923 might not right be right access to request */
924 rc = CIFSSMBOpen(xid, pTcon, fromName, FILE_OPEN, GENERIC_READ,
925 CREATE_NOT_DIR, &netfid, &oplock, NULL,
737b758c
SF		 926 cifs_sb_source->local_nls,
927 cifs_sb_source->mnt_cifs_flags &
928 CIFS_MOUNT_MAP_SPECIAL_CHR);
1da177e4
LT		 929 if (rc==0) {
930 CIFSSMBRenameOpenFile(xid, pTcon, netfid, toName,
737b758c
SF		 931 cifs_sb_source->local_nls,
932 cifs_sb_source->mnt_cifs_flags &
933 CIFS_MOUNT_MAP_SPECIAL_CHR);
1da177e4
LT		 934 CIFSSMBClose(xid, pTcon, netfid);
935 }
936 }
937
938cifs_rename_exit:
939 kfree(fromName);
940 kfree(toName);
941 FreeXid(xid);
942 return rc;
943}
944
945int cifs_revalidate(struct dentry *direntry)
946{
947 int xid;
948 int rc = 0;
949 char *full_path;
950 struct cifs_sb_info *cifs_sb;
951 struct cifsInodeInfo *cifsInode;
952 loff_t local_size;
953 struct timespec local_mtime;
954 int invalidate_inode = FALSE;
955
956 if (direntry->d_inode == NULL)
957 return -ENOENT;
958
959 cifsInode = CIFS_I(direntry->d_inode);
960
961 if (cifsInode == NULL)
962 return -ENOENT;
963
964 /* no sense revalidating inode info on file that no one can write */
965 if (CIFS_I(direntry->d_inode)->clientCanCacheRead)
966 return rc;
967
968 xid = GetXid();
969
970 cifs_sb = CIFS_SB(direntry->d_sb);
971
972 /* can not safely grab the rename sem here if rename calls revalidate
973 since that would deadlock */
7f57356b 974 full_path = build_path_from_dentry(direntry);
1da177e4
LT		 975 if (full_path == NULL) {
976 FreeXid(xid);
977 return -ENOMEM;
978 }
979 cFYI(1, ("Revalidate: %s inode 0x%p count %d dentry: 0x%p d_time %ld "
980 "jiffies %ld", full_path, direntry->d_inode,
981 direntry->d_inode->i_count.counter, direntry,
982 direntry->d_time, jiffies));
983
984 if (cifsInode->time == 0) {
985 /* was set to zero previously to force revalidate */
986 } else if (time_before(jiffies, cifsInode->time + HZ) &&
987 lookupCacheEnabled) {
988 if ((S_ISREG(direntry->d_inode->i_mode) == 0) ||
989 (direntry->d_inode->i_nlink == 1)) {
990 kfree(full_path);
991 FreeXid(xid);
992 return rc;
993 } else {
994 cFYI(1, ("Have to revalidate file due to hardlinks"));
995 }
996 }
997
998 /* save mtime and size */
999 local_mtime = direntry->d_inode->i_mtime;
1000 local_size = direntry->d_inode->i_size;
1001
1002 if (cifs_sb->tcon->ses->capabilities & CAP_UNIX) {
1003 rc = cifs_get_inode_info_unix(&direntry->d_inode, full_path,
1004 direntry->d_sb,xid);
1005 if (rc) {
1006 cFYI(1, ("error on getting revalidate info %d", rc));
1007/* if (rc != -ENOENT)
1008 rc = 0; */ /* BB should we cache info on
1009 certain errors? */
1010 }
1011 } else {
1012 rc = cifs_get_inode_info(&direntry->d_inode, full_path, NULL,
1013 direntry->d_sb,xid);
1014 if (rc) {
1015 cFYI(1, ("error on getting revalidate info %d", rc));
1016/* if (rc != -ENOENT)
1017 rc = 0; */ /* BB should we cache info on
1018 certain errors? */
1019 }
1020 }
1021 /* should we remap certain errors, access denied?, to zero */
1022
1023 /* if not oplocked, we invalidate inode pages if mtime or file size
1024 had changed on server */
1025
1026 if (timespec_equal(&local_mtime,&direntry->d_inode->i_mtime) &&
1027 (local_size == direntry->d_inode->i_size)) {
1028 cFYI(1, ("cifs_revalidate - inode unchanged"));
1029 } else {
1030 /* file may have changed on server */
1031 if (cifsInode->clientCanCacheRead) {
1032 /* no need to invalidate inode pages since we were the
1033 only ones who could have modified the file and the
1034 server copy is staler than ours */
1035 } else {
1036 invalidate_inode = TRUE;
1037 }
1038 }
1039
1040 /* can not grab this sem since kernel filesys locking documentation
1041 indicates i_sem may be taken by the kernel on lookup and rename
1042 which could deadlock if we grab the i_sem here as well */
1043/* down(&direntry->d_inode->i_sem);*/
1044 /* need to write out dirty pages here */
1045 if (direntry->d_inode->i_mapping) {
1046 /* do we need to lock inode until after invalidate completes
1047 below? */
1048 filemap_fdatawrite(direntry->d_inode->i_mapping);
1049 }
1050 if (invalidate_inode) {
3abb9272
SF		 1051 /* shrink_dcache not necessary now that cifs dentry ops
1052 are exported for negative dentries */
1053/* if(S_ISDIR(direntry->d_inode->i_mode))
1054 shrink_dcache_parent(direntry); */
1055 if (S_ISREG(direntry->d_inode->i_mode)) {
1056 if (direntry->d_inode->i_mapping)
1057 filemap_fdatawait(direntry->d_inode->i_mapping);
1058 /* may eventually have to do this for open files too */
1059 if (list_empty(&(cifsInode->openFileList))) {
1060 /* changed on server - flush read ahead pages */
1061 cFYI(1, ("Invalidating read ahead data on "
1062 "closed file"));
1063 invalidate_remote_inode(direntry->d_inode);
1064 }
1da177e4
LT		 1065 }
1066 }
1067/* up(&direntry->d_inode->i_sem); */
1068
1069 kfree(full_path);
1070 FreeXid(xid);
1071 return rc;
1072}
1073
1074int cifs_getattr(struct vfsmount *mnt, struct dentry *dentry,
1075 struct kstat *stat)
1076{
1077 int err = cifs_revalidate(dentry);
1078 if (!err)
1079 generic_fillattr(dentry->d_inode, stat);
1080 return err;
1081}
1082
1083static int cifs_truncate_page(struct address_space *mapping, loff_t from)
1084{
1085 pgoff_t index = from >> PAGE_CACHE_SHIFT;
1086 unsigned offset = from & (PAGE_CACHE_SIZE - 1);
1087 struct page *page;
1088 char *kaddr;
1089 int rc = 0;
1090
1091 page = grab_cache_page(mapping, index);
1092 if (!page)
1093 return -ENOMEM;
1094
1095 kaddr = kmap_atomic(page, KM_USER0);
1096 memset(kaddr + offset, 0, PAGE_CACHE_SIZE - offset);
1097 flush_dcache_page(page);
1098 kunmap_atomic(kaddr, KM_USER0);
1099 unlock_page(page);
1100 page_cache_release(page);
1101 return rc;
1102}
1103
1104int cifs_setattr(struct dentry *direntry, struct iattr *attrs)
1105{
1106 int xid;
1107 struct cifs_sb_info *cifs_sb;
1108 struct cifsTconInfo *pTcon;
1109 char *full_path = NULL;
1110 int rc = -EACCES;
1da177e4
LT		 1111 struct cifsFileInfo *open_file = NULL;
1112 FILE_BASIC_INFO time_buf;
1113 int set_time = FALSE;
1114 __u64 mode = 0xFFFFFFFFFFFFFFFFULL;
1115 __u64 uid = 0xFFFFFFFFFFFFFFFFULL;
1116 __u64 gid = 0xFFFFFFFFFFFFFFFFULL;
1117 struct cifsInodeInfo *cifsInode;
1da177e4
LT		 1118
1119 xid = GetXid();
1120
3020a1f5 1121 cFYI(1, ("In cifs_setattr, name = %s attrs->iavalid 0x%x ",
1da177e4 1122 direntry->d_name.name, attrs->ia_valid));
6473a559 1123
1da177e4
LT		 1124 cifs_sb = CIFS_SB(direntry->d_inode->i_sb);
1125 pTcon = cifs_sb->tcon;
1126
6473a559
SF		 1127 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_PERM == 0) {
1128 /* check if we have permission to change attrs */
1129 rc = inode_change_ok(direntry->d_inode, attrs);
1130 if(rc < 0) {
1131 FreeXid(xid);
1132 return rc;
1133 } else
1134 rc = 0;
1135 }
1136
1da177e4 1137 down(&direntry->d_sb->s_vfs_rename_sem);
7f57356b 1138 full_path = build_path_from_dentry(direntry);
1da177e4
LT		 1139 up(&direntry->d_sb->s_vfs_rename_sem);
1140 if (full_path == NULL) {
1141 FreeXid(xid);
1142 return -ENOMEM;
1143 }
1144 cifsInode = CIFS_I(direntry->d_inode);
1145
1146 /* BB check if we need to refresh inode from server now ? BB */
1147
1148 /* need to flush data before changing file size on server */
1149 filemap_fdatawrite(direntry->d_inode->i_mapping);
1150 filemap_fdatawait(direntry->d_inode->i_mapping);
1151
1152 if (attrs->ia_valid & ATTR_SIZE) {
1da177e4
LT		 1153 /* To avoid spurious oplock breaks from server, in the case of
1154 inodes that we already have open, avoid doing path based
1155 setting of file size if we can do it by handle.
1156 This keeps our caching token (oplock) and avoids timeouts
1157 when the local oplock break takes longer to flush
1158 writebehind data than the SMB timeout for the SetPathInfo
1159 request would allow */
6148a742
SF		 1160 open_file = find_writable_file(cifsInode);
1161 if (open_file) {
1162 __u16 nfid = open_file->netfid;
1163 __u32 npid = open_file->pid;
1164 rc = CIFSSMBSetFileSize(xid, pTcon, attrs->ia_size,
1165 nfid, npid, FALSE);
23e7dd7d 1166 atomic_dec(&open_file->wrtPending);
6148a742
SF		 1167 cFYI(1,("SetFSize for attrs rc = %d", rc));
1168 if(rc == -EINVAL) {
1169 int bytes_written;
1170 rc = CIFSSMBWrite(xid, pTcon,
1171 nfid, 0, attrs->ia_size,
1172 &bytes_written, NULL, NULL,
1173 1 /* 45 seconds */);
1174 cFYI(1,("Wrt seteof rc %d", rc));
1da177e4 1175 }
6473a559
SF		 1176 } else
1177 rc = -EINVAL;
1178
1da177e4
LT		 1179 if (rc != 0) {
1180 /* Set file size by pathname rather than by handle
1181 either because no valid, writeable file handle for
1182 it was found or because there was an error setting
1183 it by handle */
1184 rc = CIFSSMBSetEOF(xid, pTcon, full_path,
1185 attrs->ia_size, FALSE,
737b758c
SF		 1186 cifs_sb->local_nls,
1187 cifs_sb->mnt_cifs_flags &
1188 CIFS_MOUNT_MAP_SPECIAL_CHR);
e30dcf3a
SF		 1189 cFYI(1, ("SetEOF by path (setattrs) rc = %d", rc));
1190 if(rc == -EINVAL) {
1191 __u16 netfid;
1192 int oplock = FALSE;
1193
1194 rc = SMBLegacyOpen(xid, pTcon, full_path,
1195 FILE_OPEN,
1196 SYNCHRONIZE | FILE_WRITE_ATTRIBUTES,
1197 CREATE_NOT_DIR, &netfid, &oplock,
1198 NULL, cifs_sb->local_nls,
1199 cifs_sb->mnt_cifs_flags &
1200 CIFS_MOUNT_MAP_SPECIAL_CHR);
1201 if (rc==0) {
1202 int bytes_written;
1203 rc = CIFSSMBWrite(xid, pTcon,
1204 netfid, 0,
1205 attrs->ia_size,
1206 &bytes_written, NULL,
1207 NULL, 1 /* 45 sec */);
1208 cFYI(1,("wrt seteof rc %d",rc));
1209 CIFSSMBClose(xid, pTcon, netfid);
1210 }
1211
1212 }
1da177e4
LT		 1213 }
1214
1215 /* Server is ok setting allocation size implicitly - no need
1216 to call:
1217 CIFSSMBSetEOF(xid, pTcon, full_path, attrs->ia_size, TRUE,
1218 cifs_sb->local_nls);
1219 */
1220
1221 if (rc == 0) {
1222 rc = vmtruncate(direntry->d_inode, attrs->ia_size);
1223 cifs_truncate_page(direntry->d_inode->i_mapping,
1224 direntry->d_inode->i_size);
e30dcf3a
SF		 1225 } else
1226 goto cifs_setattr_exit;
1da177e4
LT		 1227 }
1228 if (attrs->ia_valid & ATTR_UID) {
e30dcf3a 1229 cFYI(1, ("UID changed to %d", attrs->ia_uid));
1da177e4 1230 uid = attrs->ia_uid;
1da177e4
LT		 1231 }
1232 if (attrs->ia_valid & ATTR_GID) {
e30dcf3a 1233 cFYI(1, ("GID changed to %d", attrs->ia_gid));
1da177e4 1234 gid = attrs->ia_gid;
1da177e4
LT		 1235 }
1236
1237 time_buf.Attributes = 0;
1238 if (attrs->ia_valid & ATTR_MODE) {
e30dcf3a 1239 cFYI(1, ("Mode changed to 0x%x", attrs->ia_mode));
1da177e4 1240 mode = attrs->ia_mode;
1da177e4
LT		 1241 }
1242
1243 if ((cifs_sb->tcon->ses->capabilities & CAP_UNIX)
1244 && (attrs->ia_valid & (ATTR_MODE | ATTR_GID | ATTR_UID)))
1245 rc = CIFSSMBUnixSetPerms(xid, pTcon, full_path, mode, uid, gid,
737b758c
SF		 1246 0 /* dev_t */, cifs_sb->local_nls,
1247 cifs_sb->mnt_cifs_flags &
1248 CIFS_MOUNT_MAP_SPECIAL_CHR);
1da177e4 1249 else if (attrs->ia_valid & ATTR_MODE) {
cdbce9c8 1250 rc = 0;
1da177e4
LT		 1251 if ((mode & S_IWUGO) == 0) /* not writeable */ {
1252 if ((cifsInode->cifsAttrs & ATTR_READONLY) == 0)
1253 time_buf.Attributes =
1254 cpu_to_le32(cifsInode->cifsAttrs |
1255 ATTR_READONLY);
1256 } else if ((mode & S_IWUGO) == S_IWUGO) {
1257 if (cifsInode->cifsAttrs & ATTR_READONLY)
1258 time_buf.Attributes =
1259 cpu_to_le32(cifsInode->cifsAttrs &
1260 (~ATTR_READONLY));
1261 }
1262 /* BB to be implemented -
1263 via Windows security descriptors or streams */
1264 /* CIFSSMBWinSetPerms(xid, pTcon, full_path, mode, uid, gid,
1265 cifs_sb->local_nls); */
1266 }
1267
1268 if (attrs->ia_valid & ATTR_ATIME) {
1269 set_time = TRUE;
1270 time_buf.LastAccessTime =
1271 cpu_to_le64(cifs_UnixTimeToNT(attrs->ia_atime));
1272 } else
1273 time_buf.LastAccessTime = 0;
1274
1275 if (attrs->ia_valid & ATTR_MTIME) {
1276 set_time = TRUE;
1277 time_buf.LastWriteTime =
1278 cpu_to_le64(cifs_UnixTimeToNT(attrs->ia_mtime));
1279 } else
1280 time_buf.LastWriteTime = 0;
e30dcf3a
SF		 1281 /* Do not set ctime explicitly unless other time
1282 stamps are changed explicitly (i.e. by utime()
1283 since we would then have a mix of client and
1284 server times */
1285
1286 if (set_time && (attrs->ia_valid & ATTR_CTIME)) {
1da177e4 1287 set_time = TRUE;
e30dcf3a
SF		 1288 /* Although Samba throws this field away
1289 it may be useful to Windows - but we do
1290 not want to set ctime unless some other
1291 timestamp is changing */
1292 cFYI(1, ("CIFS - CTIME changed "));
1da177e4
LT		 1293 time_buf.ChangeTime =
1294 cpu_to_le64(cifs_UnixTimeToNT(attrs->ia_ctime));
1295 } else
1296 time_buf.ChangeTime = 0;
1297
1298 if (set_time || time_buf.Attributes) {
1da177e4
LT		 1299 time_buf.CreationTime = 0; /* do not change */
1300 /* In the future we should experiment - try setting timestamps
1301 via Handle (SetFileInfo) instead of by path */
1302 if (!(pTcon->ses->flags & CIFS_SES_NT4))
1303 rc = CIFSSMBSetTimes(xid, pTcon, full_path, &time_buf,
737b758c
SF		 1304 cifs_sb->local_nls,
1305 cifs_sb->mnt_cifs_flags &
1306 CIFS_MOUNT_MAP_SPECIAL_CHR);
1da177e4
LT		 1307 else
1308 rc = -EOPNOTSUPP;
1309
1310 if (rc == -EOPNOTSUPP) {
1311 int oplock = FALSE;
1312 __u16 netfid;
1313
1314 cFYI(1, ("calling SetFileInfo since SetPathInfo for "
1315 "times not supported by this server"));
1316 /* BB we could scan to see if we already have it open
1317 and pass in pid of opener to function */
1318 rc = CIFSSMBOpen(xid, pTcon, full_path, FILE_OPEN,
1319 SYNCHRONIZE | FILE_WRITE_ATTRIBUTES,
1320 CREATE_NOT_DIR, &netfid, &oplock,
737b758c
SF		 1321 NULL, cifs_sb->local_nls,
1322 cifs_sb->mnt_cifs_flags &
1323 CIFS_MOUNT_MAP_SPECIAL_CHR);
1da177e4
LT		 1324 if (rc==0) {
1325 rc = CIFSSMBSetFileTimes(xid, pTcon, &time_buf,
1326 netfid);
1327 CIFSSMBClose(xid, pTcon, netfid);
1328 } else {
1329 /* BB For even older servers we could convert time_buf
1330 into old DOS style which uses two second
1331 granularity */
1332
1333 /* rc = CIFSSMBSetTimesLegacy(xid, pTcon, full_path,
1334 &time_buf, cifs_sb->local_nls); */
1335 }
1336 }
e30dcf3a
SF		 1337 /* Even if error on time set, no sense failing the call if
1338 the server would set the time to a reasonable value anyway,
1339 and this check ensures that we are not being called from
1340 sys_utimes in which case we ought to fail the call back to
1341 the user when the server rejects the call */
1342 if((rc) && (attrs->ia_valid &&
1343 (ATTR_MODE | ATTR_GID | ATTR_UID | ATTR_SIZE)))
1344 rc = 0;
1da177e4
LT		 1345 }
1346
1347 /* do not need local check to inode_check_ok since the server does
1348 that */
1349 if (!rc)
1350 rc = inode_setattr(direntry->d_inode, attrs);
e30dcf3a 1351cifs_setattr_exit:
1da177e4
LT		 1352 kfree(full_path);
1353 FreeXid(xid);
1354 return rc;
1355}
1356
1357void cifs_delete_inode(struct inode *inode)
1358{
1359 cFYI(1, ("In cifs_delete_inode, inode = 0x%p ", inode));
1360 /* may have to add back in if and when safe distributed caching of
1361 directories added e.g. via FindNotify */
1362}
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