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[PATCH] fat: support a truncate() for expanding size (generic_cont_expand)
[deliverable/linux.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;
25741b3e 773 direntry->d_inode->i_mode |= S_IFDIR;
6473a559
SF		 774 if(cifs_sb->mnt_cifs_flags &
775 CIFS_MOUNT_SET_UID) {
776 direntry->d_inode->i_uid =
777 current->fsuid;
778 direntry->d_inode->i_gid =
779 current->fsgid;
780 }
781 }
2a138ebb 782 }
1da177e4
LT		 783 }
784 kfree(full_path);
785 FreeXid(xid);
786 return rc;
787}
788
789int cifs_rmdir(struct inode *inode, struct dentry *direntry)
790{
791 int rc = 0;
792 int xid;
793 struct cifs_sb_info *cifs_sb;
794 struct cifsTconInfo *pTcon;
795 char *full_path = NULL;
796 struct cifsInodeInfo *cifsInode;
797
3020a1f5 798 cFYI(1, ("cifs_rmdir, inode = 0x%p with ", inode));
1da177e4
LT		 799
800 xid = GetXid();
801
802 cifs_sb = CIFS_SB(inode->i_sb);
803 pTcon = cifs_sb->tcon;
804
805 down(&inode->i_sb->s_vfs_rename_sem);
7f57356b 806 full_path = build_path_from_dentry(direntry);
1da177e4
LT		 807 up(&inode->i_sb->s_vfs_rename_sem);
808 if (full_path == NULL) {
809 FreeXid(xid);
810 return -ENOMEM;
811 }
812
737b758c
SF		 813 rc = CIFSSMBRmDir(xid, pTcon, full_path, cifs_sb->local_nls,
814 cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR);
1da177e4
LT		 815
816 if (!rc) {
817 inode->i_nlink--;
818 i_size_write(direntry->d_inode,0);
819 direntry->d_inode->i_nlink = 0;
820 }
821
822 cifsInode = CIFS_I(direntry->d_inode);
823 cifsInode->time = 0; /* force revalidate to go get info when
824 needed */
825 direntry->d_inode->i_ctime = inode->i_ctime = inode->i_mtime =
826 current_fs_time(inode->i_sb);
827
828 kfree(full_path);
829 FreeXid(xid);
830 return rc;
831}
832
833int cifs_rename(struct inode *source_inode, struct dentry *source_direntry,
834 struct inode *target_inode, struct dentry *target_direntry)
835{
836 char *fromName;
837 char *toName;
838 struct cifs_sb_info *cifs_sb_source;
839 struct cifs_sb_info *cifs_sb_target;
840 struct cifsTconInfo *pTcon;
841 int xid;
842 int rc = 0;
843
844 xid = GetXid();
845
846 cifs_sb_target = CIFS_SB(target_inode->i_sb);
847 cifs_sb_source = CIFS_SB(source_inode->i_sb);
848 pTcon = cifs_sb_source->tcon;
849
850 if (pTcon != cifs_sb_target->tcon) {
851 FreeXid(xid);
852 return -EXDEV; /* BB actually could be allowed if same server,
853 but different share.
854 Might eventually add support for this */
855 }
856
857 /* we already have the rename sem so we do not need to grab it again
858 here to protect the path integrity */
7f57356b
SF		 859 fromName = build_path_from_dentry(source_direntry);
860 toName = build_path_from_dentry(target_direntry);
1da177e4
LT		 861 if ((fromName == NULL) || (toName == NULL)) {
862 rc = -ENOMEM;
863 goto cifs_rename_exit;
864 }
865
866 rc = CIFSSMBRename(xid, pTcon, fromName, toName,
737b758c
SF		 867 cifs_sb_source->local_nls,
868 cifs_sb_source->mnt_cifs_flags &
869 CIFS_MOUNT_MAP_SPECIAL_CHR);
1da177e4
LT		 870 if (rc == -EEXIST) {
871 /* check if they are the same file because rename of hardlinked
872 files is a noop */
873 FILE_UNIX_BASIC_INFO *info_buf_source;
874 FILE_UNIX_BASIC_INFO *info_buf_target;
875
876 info_buf_source =
877 kmalloc(2 * sizeof(FILE_UNIX_BASIC_INFO), GFP_KERNEL);
878 if (info_buf_source != NULL) {
879 info_buf_target = info_buf_source + 1;
880 rc = CIFSSMBUnixQPathInfo(xid, pTcon, fromName,
737b758c
SF		 881 info_buf_source, cifs_sb_source->local_nls,
882 cifs_sb_source->mnt_cifs_flags &
883 CIFS_MOUNT_MAP_SPECIAL_CHR);
1da177e4
LT		 884 if (rc == 0) {
885 rc = CIFSSMBUnixQPathInfo(xid, pTcon, toName,
886 info_buf_target,
737b758c
SF		 887 cifs_sb_target->local_nls,
888 /* remap based on source sb */
889 cifs_sb_source->mnt_cifs_flags &
890 CIFS_MOUNT_MAP_SPECIAL_CHR);
1da177e4
LT		 891 }
892 if ((rc == 0) &&
893 (info_buf_source->UniqueId ==
894 info_buf_target->UniqueId)) {
895 /* do not rename since the files are hardlinked which
896 is a noop */
897 } else {
898 /* we either can not tell the files are hardlinked
899 (as with Windows servers) or files are not
900 hardlinked so delete the target manually before
901 renaming to follow POSIX rather than Windows
902 semantics */
903 cifs_unlink(target_inode, target_direntry);
904 rc = CIFSSMBRename(xid, pTcon, fromName,
905 toName,
737b758c
SF		 906 cifs_sb_source->local_nls,
907 cifs_sb_source->mnt_cifs_flags
908 & CIFS_MOUNT_MAP_SPECIAL_CHR);
1da177e4
LT		 909 }
910 kfree(info_buf_source);
911 } /* if we can not get memory just leave rc as EEXIST */
912 }
913
914 if (rc) {
915 cFYI(1, ("rename rc %d", rc));
916 }
917
918 if ((rc == -EIO) || (rc == -EEXIST)) {
919 int oplock = FALSE;
920 __u16 netfid;
921
922 /* BB FIXME Is Generic Read correct for rename? */
923 /* if renaming directory - we should not say CREATE_NOT_DIR,
924 need to test renaming open directory, also GENERIC_READ
925 might not right be right access to request */
926 rc = CIFSSMBOpen(xid, pTcon, fromName, FILE_OPEN, GENERIC_READ,
927 CREATE_NOT_DIR, &netfid, &oplock, NULL,
737b758c
SF		 928 cifs_sb_source->local_nls,
929 cifs_sb_source->mnt_cifs_flags &
930 CIFS_MOUNT_MAP_SPECIAL_CHR);
1da177e4
LT		 931 if (rc==0) {
932 CIFSSMBRenameOpenFile(xid, pTcon, netfid, toName,
737b758c
SF		 933 cifs_sb_source->local_nls,
934 cifs_sb_source->mnt_cifs_flags &
935 CIFS_MOUNT_MAP_SPECIAL_CHR);
1da177e4
LT		 936 CIFSSMBClose(xid, pTcon, netfid);
937 }
938 }
939
940cifs_rename_exit:
941 kfree(fromName);
942 kfree(toName);
943 FreeXid(xid);
944 return rc;
945}
946
947int cifs_revalidate(struct dentry *direntry)
948{
949 int xid;
950 int rc = 0;
951 char *full_path;
952 struct cifs_sb_info *cifs_sb;
953 struct cifsInodeInfo *cifsInode;
954 loff_t local_size;
955 struct timespec local_mtime;
956 int invalidate_inode = FALSE;
957
958 if (direntry->d_inode == NULL)
959 return -ENOENT;
960
961 cifsInode = CIFS_I(direntry->d_inode);
962
963 if (cifsInode == NULL)
964 return -ENOENT;
965
966 /* no sense revalidating inode info on file that no one can write */
967 if (CIFS_I(direntry->d_inode)->clientCanCacheRead)
968 return rc;
969
970 xid = GetXid();
971
972 cifs_sb = CIFS_SB(direntry->d_sb);
973
974 /* can not safely grab the rename sem here if rename calls revalidate
975 since that would deadlock */
7f57356b 976 full_path = build_path_from_dentry(direntry);
1da177e4
LT		 977 if (full_path == NULL) {
978 FreeXid(xid);
979 return -ENOMEM;
980 }
981 cFYI(1, ("Revalidate: %s inode 0x%p count %d dentry: 0x%p d_time %ld "
982 "jiffies %ld", full_path, direntry->d_inode,
983 direntry->d_inode->i_count.counter, direntry,
984 direntry->d_time, jiffies));
985
986 if (cifsInode->time == 0) {
987 /* was set to zero previously to force revalidate */
988 } else if (time_before(jiffies, cifsInode->time + HZ) &&
989 lookupCacheEnabled) {
990 if ((S_ISREG(direntry->d_inode->i_mode) == 0) ||
991 (direntry->d_inode->i_nlink == 1)) {
992 kfree(full_path);
993 FreeXid(xid);
994 return rc;
995 } else {
996 cFYI(1, ("Have to revalidate file due to hardlinks"));
997 }
998 }
999
1000 /* save mtime and size */
1001 local_mtime = direntry->d_inode->i_mtime;
1002 local_size = direntry->d_inode->i_size;
1003
1004 if (cifs_sb->tcon->ses->capabilities & CAP_UNIX) {
1005 rc = cifs_get_inode_info_unix(&direntry->d_inode, full_path,
1006 direntry->d_sb,xid);
1007 if (rc) {
1008 cFYI(1, ("error on getting revalidate info %d", rc));
1009/* if (rc != -ENOENT)
1010 rc = 0; */ /* BB should we cache info on
1011 certain errors? */
1012 }
1013 } else {
1014 rc = cifs_get_inode_info(&direntry->d_inode, full_path, NULL,
1015 direntry->d_sb,xid);
1016 if (rc) {
1017 cFYI(1, ("error on getting revalidate info %d", rc));
1018/* if (rc != -ENOENT)
1019 rc = 0; */ /* BB should we cache info on
1020 certain errors? */
1021 }
1022 }
1023 /* should we remap certain errors, access denied?, to zero */
1024
1025 /* if not oplocked, we invalidate inode pages if mtime or file size
1026 had changed on server */
1027
1028 if (timespec_equal(&local_mtime,&direntry->d_inode->i_mtime) &&
1029 (local_size == direntry->d_inode->i_size)) {
1030 cFYI(1, ("cifs_revalidate - inode unchanged"));
1031 } else {
1032 /* file may have changed on server */
1033 if (cifsInode->clientCanCacheRead) {
1034 /* no need to invalidate inode pages since we were the
1035 only ones who could have modified the file and the
1036 server copy is staler than ours */
1037 } else {
1038 invalidate_inode = TRUE;
1039 }
1040 }
1041
1042 /* can not grab this sem since kernel filesys locking documentation
1043 indicates i_sem may be taken by the kernel on lookup and rename
1044 which could deadlock if we grab the i_sem here as well */
1045/* down(&direntry->d_inode->i_sem);*/
1046 /* need to write out dirty pages here */
1047 if (direntry->d_inode->i_mapping) {
1048 /* do we need to lock inode until after invalidate completes
1049 below? */
1050 filemap_fdatawrite(direntry->d_inode->i_mapping);
1051 }
1052 if (invalidate_inode) {
3abb9272
SF		 1053 /* shrink_dcache not necessary now that cifs dentry ops
1054 are exported for negative dentries */
1055/* if(S_ISDIR(direntry->d_inode->i_mode))
1056 shrink_dcache_parent(direntry); */
1057 if (S_ISREG(direntry->d_inode->i_mode)) {
1058 if (direntry->d_inode->i_mapping)
1059 filemap_fdatawait(direntry->d_inode->i_mapping);
1060 /* may eventually have to do this for open files too */
1061 if (list_empty(&(cifsInode->openFileList))) {
1062 /* changed on server - flush read ahead pages */
1063 cFYI(1, ("Invalidating read ahead data on "
1064 "closed file"));
1065 invalidate_remote_inode(direntry->d_inode);
1066 }
1da177e4
LT		 1067 }
1068 }
1069/* up(&direntry->d_inode->i_sem); */
1070
1071 kfree(full_path);
1072 FreeXid(xid);
1073 return rc;
1074}
1075
1076int cifs_getattr(struct vfsmount *mnt, struct dentry *dentry,
1077 struct kstat *stat)
1078{
1079 int err = cifs_revalidate(dentry);
1080 if (!err)
1081 generic_fillattr(dentry->d_inode, stat);
1082 return err;
1083}
1084
1085static int cifs_truncate_page(struct address_space *mapping, loff_t from)
1086{
1087 pgoff_t index = from >> PAGE_CACHE_SHIFT;
1088 unsigned offset = from & (PAGE_CACHE_SIZE - 1);
1089 struct page *page;
1090 char *kaddr;
1091 int rc = 0;
1092
1093 page = grab_cache_page(mapping, index);
1094 if (!page)
1095 return -ENOMEM;
1096
1097 kaddr = kmap_atomic(page, KM_USER0);
1098 memset(kaddr + offset, 0, PAGE_CACHE_SIZE - offset);
1099 flush_dcache_page(page);
1100 kunmap_atomic(kaddr, KM_USER0);
1101 unlock_page(page);
1102 page_cache_release(page);
1103 return rc;
1104}
1105
1106int cifs_setattr(struct dentry *direntry, struct iattr *attrs)
1107{
1108 int xid;
1109 struct cifs_sb_info *cifs_sb;
1110 struct cifsTconInfo *pTcon;
1111 char *full_path = NULL;
1112 int rc = -EACCES;
1da177e4
LT		 1113 struct cifsFileInfo *open_file = NULL;
1114 FILE_BASIC_INFO time_buf;
1115 int set_time = FALSE;
1116 __u64 mode = 0xFFFFFFFFFFFFFFFFULL;
1117 __u64 uid = 0xFFFFFFFFFFFFFFFFULL;
1118 __u64 gid = 0xFFFFFFFFFFFFFFFFULL;
1119 struct cifsInodeInfo *cifsInode;
1da177e4
LT		 1120
1121 xid = GetXid();
1122
3020a1f5 1123 cFYI(1, ("In cifs_setattr, name = %s attrs->iavalid 0x%x ",
1da177e4 1124 direntry->d_name.name, attrs->ia_valid));
6473a559 1125
1da177e4
LT		 1126 cifs_sb = CIFS_SB(direntry->d_inode->i_sb);
1127 pTcon = cifs_sb->tcon;
1128
2a138ebb 1129 if ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_PERM) == 0) {
6473a559
SF		 1130 /* check if we have permission to change attrs */
1131 rc = inode_change_ok(direntry->d_inode, attrs);
1132 if(rc < 0) {
1133 FreeXid(xid);
1134 return rc;
1135 } else
1136 rc = 0;
1137 }
1138
1da177e4 1139 down(&direntry->d_sb->s_vfs_rename_sem);
7f57356b 1140 full_path = build_path_from_dentry(direntry);
1da177e4
LT		 1141 up(&direntry->d_sb->s_vfs_rename_sem);
1142 if (full_path == NULL) {
1143 FreeXid(xid);
1144 return -ENOMEM;
1145 }
1146 cifsInode = CIFS_I(direntry->d_inode);
1147
1148 /* BB check if we need to refresh inode from server now ? BB */
1149
1150 /* need to flush data before changing file size on server */
1151 filemap_fdatawrite(direntry->d_inode->i_mapping);
1152 filemap_fdatawait(direntry->d_inode->i_mapping);
1153
1154 if (attrs->ia_valid & ATTR_SIZE) {
1da177e4
LT		 1155 /* To avoid spurious oplock breaks from server, in the case of
1156 inodes that we already have open, avoid doing path based
1157 setting of file size if we can do it by handle.
1158 This keeps our caching token (oplock) and avoids timeouts
1159 when the local oplock break takes longer to flush
1160 writebehind data than the SMB timeout for the SetPathInfo
1161 request would allow */
6148a742
SF		 1162 open_file = find_writable_file(cifsInode);
1163 if (open_file) {
1164 __u16 nfid = open_file->netfid;
1165 __u32 npid = open_file->pid;
1166 rc = CIFSSMBSetFileSize(xid, pTcon, attrs->ia_size,
1167 nfid, npid, FALSE);
23e7dd7d 1168 atomic_dec(&open_file->wrtPending);
6148a742
SF		 1169 cFYI(1,("SetFSize for attrs rc = %d", rc));
1170 if(rc == -EINVAL) {
1171 int bytes_written;
1172 rc = CIFSSMBWrite(xid, pTcon,
1173 nfid, 0, attrs->ia_size,
1174 &bytes_written, NULL, NULL,
1175 1 /* 45 seconds */);
1176 cFYI(1,("Wrt seteof rc %d", rc));
1da177e4 1177 }
6473a559
SF		 1178 } else
1179 rc = -EINVAL;
1180
1da177e4
LT		 1181 if (rc != 0) {
1182 /* Set file size by pathname rather than by handle
1183 either because no valid, writeable file handle for
1184 it was found or because there was an error setting
1185 it by handle */
1186 rc = CIFSSMBSetEOF(xid, pTcon, full_path,
1187 attrs->ia_size, FALSE,
737b758c
SF		 1188 cifs_sb->local_nls,
1189 cifs_sb->mnt_cifs_flags &
1190 CIFS_MOUNT_MAP_SPECIAL_CHR);
e30dcf3a
SF		 1191 cFYI(1, ("SetEOF by path (setattrs) rc = %d", rc));
1192 if(rc == -EINVAL) {
1193 __u16 netfid;
1194 int oplock = FALSE;
1195
1196 rc = SMBLegacyOpen(xid, pTcon, full_path,
1197 FILE_OPEN,
1198 SYNCHRONIZE | FILE_WRITE_ATTRIBUTES,
1199 CREATE_NOT_DIR, &netfid, &oplock,
1200 NULL, cifs_sb->local_nls,
1201 cifs_sb->mnt_cifs_flags &
1202 CIFS_MOUNT_MAP_SPECIAL_CHR);
1203 if (rc==0) {
1204 int bytes_written;
1205 rc = CIFSSMBWrite(xid, pTcon,
1206 netfid, 0,
1207 attrs->ia_size,
1208 &bytes_written, NULL,
1209 NULL, 1 /* 45 sec */);
1210 cFYI(1,("wrt seteof rc %d",rc));
1211 CIFSSMBClose(xid, pTcon, netfid);
1212 }
1213
1214 }
1da177e4
LT		 1215 }
1216
1217 /* Server is ok setting allocation size implicitly - no need
1218 to call:
1219 CIFSSMBSetEOF(xid, pTcon, full_path, attrs->ia_size, TRUE,
1220 cifs_sb->local_nls);
1221 */
1222
1223 if (rc == 0) {
1224 rc = vmtruncate(direntry->d_inode, attrs->ia_size);
1225 cifs_truncate_page(direntry->d_inode->i_mapping,
1226 direntry->d_inode->i_size);
e30dcf3a
SF		 1227 } else
1228 goto cifs_setattr_exit;
1da177e4
LT		 1229 }
1230 if (attrs->ia_valid & ATTR_UID) {
e30dcf3a 1231 cFYI(1, ("UID changed to %d", attrs->ia_uid));
1da177e4 1232 uid = attrs->ia_uid;
1da177e4
LT		 1233 }
1234 if (attrs->ia_valid & ATTR_GID) {
e30dcf3a 1235 cFYI(1, ("GID changed to %d", attrs->ia_gid));
1da177e4 1236 gid = attrs->ia_gid;
1da177e4
LT		 1237 }
1238
1239 time_buf.Attributes = 0;
1240 if (attrs->ia_valid & ATTR_MODE) {
e30dcf3a 1241 cFYI(1, ("Mode changed to 0x%x", attrs->ia_mode));
1da177e4 1242 mode = attrs->ia_mode;
1da177e4
LT		 1243 }
1244
1245 if ((cifs_sb->tcon->ses->capabilities & CAP_UNIX)
1246 && (attrs->ia_valid & (ATTR_MODE | ATTR_GID | ATTR_UID)))
1247 rc = CIFSSMBUnixSetPerms(xid, pTcon, full_path, mode, uid, gid,
737b758c
SF		 1248 0 /* dev_t */, cifs_sb->local_nls,
1249 cifs_sb->mnt_cifs_flags &
1250 CIFS_MOUNT_MAP_SPECIAL_CHR);
1da177e4 1251 else if (attrs->ia_valid & ATTR_MODE) {
cdbce9c8 1252 rc = 0;
1da177e4
LT		 1253 if ((mode & S_IWUGO) == 0) /* not writeable */ {
1254 if ((cifsInode->cifsAttrs & ATTR_READONLY) == 0)
1255 time_buf.Attributes =
1256 cpu_to_le32(cifsInode->cifsAttrs |
1257 ATTR_READONLY);
1258 } else if ((mode & S_IWUGO) == S_IWUGO) {
1259 if (cifsInode->cifsAttrs & ATTR_READONLY)
1260 time_buf.Attributes =
1261 cpu_to_le32(cifsInode->cifsAttrs &
1262 (~ATTR_READONLY));
1263 }
1264 /* BB to be implemented -
1265 via Windows security descriptors or streams */
1266 /* CIFSSMBWinSetPerms(xid, pTcon, full_path, mode, uid, gid,
1267 cifs_sb->local_nls); */
1268 }
1269
1270 if (attrs->ia_valid & ATTR_ATIME) {
1271 set_time = TRUE;
1272 time_buf.LastAccessTime =
1273 cpu_to_le64(cifs_UnixTimeToNT(attrs->ia_atime));
1274 } else
1275 time_buf.LastAccessTime = 0;
1276
1277 if (attrs->ia_valid & ATTR_MTIME) {
1278 set_time = TRUE;
1279 time_buf.LastWriteTime =
1280 cpu_to_le64(cifs_UnixTimeToNT(attrs->ia_mtime));
1281 } else
1282 time_buf.LastWriteTime = 0;
e30dcf3a
SF		 1283 /* Do not set ctime explicitly unless other time
1284 stamps are changed explicitly (i.e. by utime()
1285 since we would then have a mix of client and
1286 server times */
1287
1288 if (set_time && (attrs->ia_valid & ATTR_CTIME)) {
1da177e4 1289 set_time = TRUE;
e30dcf3a
SF		 1290 /* Although Samba throws this field away
1291 it may be useful to Windows - but we do
1292 not want to set ctime unless some other
1293 timestamp is changing */
1294 cFYI(1, ("CIFS - CTIME changed "));
1da177e4
LT		 1295 time_buf.ChangeTime =
1296 cpu_to_le64(cifs_UnixTimeToNT(attrs->ia_ctime));
1297 } else
1298 time_buf.ChangeTime = 0;
1299
1300 if (set_time || time_buf.Attributes) {
1da177e4
LT		 1301 time_buf.CreationTime = 0; /* do not change */
1302 /* In the future we should experiment - try setting timestamps
1303 via Handle (SetFileInfo) instead of by path */
1304 if (!(pTcon->ses->flags & CIFS_SES_NT4))
1305 rc = CIFSSMBSetTimes(xid, pTcon, full_path, &time_buf,
737b758c
SF		 1306 cifs_sb->local_nls,
1307 cifs_sb->mnt_cifs_flags &
1308 CIFS_MOUNT_MAP_SPECIAL_CHR);
1da177e4
LT		 1309 else
1310 rc = -EOPNOTSUPP;
1311
1312 if (rc == -EOPNOTSUPP) {
1313 int oplock = FALSE;
1314 __u16 netfid;
1315
1316 cFYI(1, ("calling SetFileInfo since SetPathInfo for "
1317 "times not supported by this server"));
1318 /* BB we could scan to see if we already have it open
1319 and pass in pid of opener to function */
1320 rc = CIFSSMBOpen(xid, pTcon, full_path, FILE_OPEN,
1321 SYNCHRONIZE | FILE_WRITE_ATTRIBUTES,
1322 CREATE_NOT_DIR, &netfid, &oplock,
737b758c
SF		 1323 NULL, cifs_sb->local_nls,
1324 cifs_sb->mnt_cifs_flags &
1325 CIFS_MOUNT_MAP_SPECIAL_CHR);
1da177e4
LT		 1326 if (rc==0) {
1327 rc = CIFSSMBSetFileTimes(xid, pTcon, &time_buf,
1328 netfid);
1329 CIFSSMBClose(xid, pTcon, netfid);
1330 } else {
1331 /* BB For even older servers we could convert time_buf
1332 into old DOS style which uses two second
1333 granularity */
1334
1335 /* rc = CIFSSMBSetTimesLegacy(xid, pTcon, full_path,
1336 &time_buf, cifs_sb->local_nls); */
1337 }
1338 }
e30dcf3a
SF		 1339 /* Even if error on time set, no sense failing the call if
1340 the server would set the time to a reasonable value anyway,
1341 and this check ensures that we are not being called from
1342 sys_utimes in which case we ought to fail the call back to
1343 the user when the server rejects the call */
1344 if((rc) && (attrs->ia_valid &&
1345 (ATTR_MODE | ATTR_GID | ATTR_UID | ATTR_SIZE)))
1346 rc = 0;
1da177e4
LT		 1347 }
1348
1349 /* do not need local check to inode_check_ok since the server does
1350 that */
1351 if (!rc)
1352 rc = inode_setattr(direntry->d_inode, attrs);
e30dcf3a 1353cifs_setattr_exit:
1da177e4
LT		 1354 kfree(full_path);
1355 FreeXid(xid);
1356 return rc;
1357}
1358
1359void cifs_delete_inode(struct inode *inode)
1360{
1361 cFYI(1, ("In cifs_delete_inode, inode = 0x%p ", inode));
1362 /* may have to add back in if and when safe distributed caching of
1363 directories added e.g. via FindNotify */
1364}
Linux kernel - Deliverables
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