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[CIFS] Fix locking problem around some cifs uses of i_size write
[GitHub/mt8127/android_kernel_alcatel_ttab.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>
1da177e4
LT		 22#include <linux/stat.h>
23#include <linux/pagemap.h>
24#include <asm/div64.h>
25#include "cifsfs.h"
26#include "cifspdu.h"
27#include "cifsglob.h"
28#include "cifsproto.h"
29#include "cifs_debug.h"
30#include "cifs_fs_sb.h"
31
32int cifs_get_inode_info_unix(struct inode **pinode,
33 const unsigned char *search_path, struct super_block *sb, int xid)
34{
35 int rc = 0;
36 FILE_UNIX_BASIC_INFO findData;
37 struct cifsTconInfo *pTcon;
38 struct inode *inode;
39 struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
40 char *tmp_path;
41
42 pTcon = cifs_sb->tcon;
26a21b98 43 cFYI(1, ("Getting info on %s", search_path));
1da177e4
LT		 44 /* could have done a find first instead but this returns more info */
45 rc = CIFSSMBUnixQPathInfo(xid, pTcon, search_path, &findData,
737b758c
SF		 46 cifs_sb->local_nls, cifs_sb->mnt_cifs_flags &
47 CIFS_MOUNT_MAP_SPECIAL_CHR);
1da177e4
LT		 48/* dump_mem("\nUnixQPathInfo return data", &findData,
49 sizeof(findData)); */
50 if (rc) {
51 if (rc == -EREMOTE) {
52 tmp_path =
53 kmalloc(strnlen(pTcon->treeName,
54 MAX_TREE_SIZE + 1) +
55 strnlen(search_path, MAX_PATHCONF) + 1,
56 GFP_KERNEL);
57 if (tmp_path == NULL) {
58 return -ENOMEM;
59 }
60 /* have to skip first of the double backslash of
61 UNC name */
62 strncpy(tmp_path, pTcon->treeName, MAX_TREE_SIZE);
63 strncat(tmp_path, search_path, MAX_PATHCONF);
64 rc = connect_to_dfs_path(xid, pTcon->ses,
65 /* treename + */ tmp_path,
737b758c
SF		 66 cifs_sb->local_nls,
67 cifs_sb->mnt_cifs_flags &
68 CIFS_MOUNT_MAP_SPECIAL_CHR);
1da177e4
LT		 69 kfree(tmp_path);
70
71 /* BB fix up inode etc. */
72 } else if (rc) {
73 return rc;
74 }
75 } else {
76 struct cifsInodeInfo *cifsInfo;
77 __u32 type = le32_to_cpu(findData.Type);
78 __u64 num_of_bytes = le64_to_cpu(findData.NumOfBytes);
79 __u64 end_of_file = le64_to_cpu(findData.EndOfFile);
80
81 /* get new inode */
82 if (*pinode == NULL) {
83 *pinode = new_inode(sb);
d0d2f2df 84 if (*pinode == NULL)
1da177e4
LT		 85 return -ENOMEM;
86 /* Is an i_ino of zero legal? */
87 /* Are there sanity checks we can use to ensure that
88 the server is really filling in that field? */
d0d2f2df 89 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM) {
1da177e4
LT		 90 (*pinode)->i_ino =
91 (unsigned long)findData.UniqueId;
92 } /* note ino incremented to unique num in new_inode */
1b2b2126
SF		 93 if(sb->s_flags & MS_NOATIME)
94 (*pinode)->i_flags |= S_NOATIME | S_NOCMTIME;
95
1da177e4
LT		 96 insert_inode_hash(*pinode);
97 }
98
99 inode = *pinode;
100 cifsInfo = CIFS_I(inode);
101
26a21b98 102 cFYI(1, ("Old time %ld", cifsInfo->time));
1da177e4 103 cifsInfo->time = jiffies;
26a21b98 104 cFYI(1, ("New time %ld", cifsInfo->time));
1da177e4
LT		 105 /* this is ok to set on every inode revalidate */
106 atomic_set(&cifsInfo->inUse,1);
107
108 inode->i_atime =
109 cifs_NTtimeToUnix(le64_to_cpu(findData.LastAccessTime));
110 inode->i_mtime =
111 cifs_NTtimeToUnix(le64_to_cpu
112 (findData.LastModificationTime));
113 inode->i_ctime =
114 cifs_NTtimeToUnix(le64_to_cpu(findData.LastStatusChange));
115 inode->i_mode = le64_to_cpu(findData.Permissions);
3020a1f5
SF		 116 /* since we set the inode type below we need to mask off
117 to avoid strange results if bits set above */
118 inode->i_mode &= ~S_IFMT;
1da177e4
LT		 119 if (type == UNIX_FILE) {
120 inode->i_mode |= S_IFREG;
121 } else if (type == UNIX_SYMLINK) {
122 inode->i_mode |= S_IFLNK;
123 } else if (type == UNIX_DIR) {
124 inode->i_mode |= S_IFDIR;
125 } else if (type == UNIX_CHARDEV) {
126 inode->i_mode |= S_IFCHR;
127 inode->i_rdev = MKDEV(le64_to_cpu(findData.DevMajor),
128 le64_to_cpu(findData.DevMinor) & MINORMASK);
129 } else if (type == UNIX_BLOCKDEV) {
130 inode->i_mode |= S_IFBLK;
131 inode->i_rdev = MKDEV(le64_to_cpu(findData.DevMajor),
132 le64_to_cpu(findData.DevMinor) & MINORMASK);
133 } else if (type == UNIX_FIFO) {
134 inode->i_mode |= S_IFIFO;
135 } else if (type == UNIX_SOCKET) {
136 inode->i_mode |= S_IFSOCK;
3020a1f5
SF		 137 } else {
138 /* safest to call it a file if we do not know */
139 inode->i_mode |= S_IFREG;
140 cFYI(1,("unknown type %d",type));
1da177e4
LT		 141 }
142 inode->i_uid = le64_to_cpu(findData.Uid);
143 inode->i_gid = le64_to_cpu(findData.Gid);
144 inode->i_nlink = le64_to_cpu(findData.Nlinks);
145
3677db10 146 spin_lock(&inode->i_lock);
7ba52631 147 if (is_size_safe_to_change(cifsInfo, end_of_file)) {
1da177e4
LT		 148 /* can not safely change the file size here if the
149 client is writing to it due to potential races */
1da177e4
LT		 150 i_size_write(inode, end_of_file);
151
152 /* blksize needs to be multiple of two. So safer to default to
153 blksize and blkbits set in superblock so 2**blkbits and blksize
154 will match rather than setting to:
155 (pTcon->ses->server->maxBuf - MAX_CIFS_HDR_SIZE) & 0xFFFFFE00;*/
156
157 /* This seems incredibly stupid but it turns out that i_blocks
158 is not related to (i_size / i_blksize), instead 512 byte size
159 is required for calculating num blocks */
160
161 /* 512 bytes (2**9) is the fake blocksize that must be used */
162 /* for this calculation */
163 inode->i_blocks = (512 - 1 + num_of_bytes) >> 9;
164 }
3677db10 165 spin_unlock(&inode->i_lock);
1da177e4
LT		 166
167 if (num_of_bytes < end_of_file)
8b94bcb9 168 cFYI(1, ("allocation size less than end of file"));
5515eff8
AM		 169 cFYI(1, ("Size %ld and blocks %llu",
170 (unsigned long) inode->i_size,
171 (unsigned long long)inode->i_blocks));
1da177e4 172 if (S_ISREG(inode->i_mode)) {
8b94bcb9 173 cFYI(1, ("File inode"));
1da177e4 174 inode->i_op = &cifs_file_inode_ops;
8b94bcb9
SF		 175 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DIRECT_IO) {
176 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_BRL)
177 inode->i_fop =
178 &cifs_file_direct_nobrl_ops;
179 else
180 inode->i_fop = &cifs_file_direct_ops;
181 } else if(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_BRL)
182 inode->i_fop = &cifs_file_nobrl_ops;
183 else /* not direct, send byte range locks */
1da177e4 184 inode->i_fop = &cifs_file_ops;
8b94bcb9 185
bfa0d75a
SF		 186 /* check if server can support readpages */
187 if(pTcon->ses->server->maxBuf <
273d81d6
DK		 188 PAGE_CACHE_SIZE + MAX_CIFS_HDR_SIZE)
189 inode->i_data.a_ops = &cifs_addr_ops_smallbuf;
190 else
191 inode->i_data.a_ops = &cifs_addr_ops;
1da177e4 192 } else if (S_ISDIR(inode->i_mode)) {
8b94bcb9 193 cFYI(1, ("Directory inode"));
1da177e4
LT		 194 inode->i_op = &cifs_dir_inode_ops;
195 inode->i_fop = &cifs_dir_ops;
196 } else if (S_ISLNK(inode->i_mode)) {
8b94bcb9 197 cFYI(1, ("Symbolic Link inode"));
1da177e4
LT		 198 inode->i_op = &cifs_symlink_inode_ops;
199 /* tmp_inode->i_fop = */ /* do not need to set to anything */
200 } else {
8b94bcb9 201 cFYI(1, ("Init special inode"));
1da177e4
LT		 202 init_special_inode(inode, inode->i_mode,
203 inode->i_rdev);
204 }
205 }
206 return rc;
207}
208
d6e2f2a4
SF		 209static int decode_sfu_inode(struct inode * inode, __u64 size,
210 const unsigned char *path,
211 struct cifs_sb_info *cifs_sb, int xid)
212{
213 int rc;
214 int oplock = FALSE;
215 __u16 netfid;
216 struct cifsTconInfo *pTcon = cifs_sb->tcon;
86c96b4b 217 char buf[24];
d6e2f2a4
SF		 218 unsigned int bytes_read;
219 char * pbuf;
220
221 pbuf = buf;
222
223 if(size == 0) {
224 inode->i_mode |= S_IFIFO;
225 return 0;
226 } else if (size < 8) {
227 return -EINVAL; /* EOPNOTSUPP? */
228 }
229
230 rc = CIFSSMBOpen(xid, pTcon, path, FILE_OPEN, GENERIC_READ,
231 CREATE_NOT_DIR, &netfid, &oplock, NULL,
232 cifs_sb->local_nls,
233 cifs_sb->mnt_cifs_flags &
234 CIFS_MOUNT_MAP_SPECIAL_CHR);
235 if (rc==0) {
ec637e3f 236 int buf_type = CIFS_NO_BUFFER;
d6e2f2a4
SF		 237 /* Read header */
238 rc = CIFSSMBRead(xid, pTcon,
239 netfid,
86c96b4b 240 24 /* length */, 0 /* offset */,
ec637e3f 241 &bytes_read, &pbuf, &buf_type);
86c96b4b 242 if((rc == 0) && (bytes_read >= 8)) {
9e294f1c
SF		 243 if(memcmp("IntxBLK", pbuf, 8) == 0) {
244 cFYI(1,("Block device"));
3020a1f5 245 inode->i_mode |= S_IFBLK;
86c96b4b
SF		 246 if(bytes_read == 24) {
247 /* we have enough to decode dev num */
248 __u64 mjr; /* major */
249 __u64 mnr; /* minor */
250 mjr = le64_to_cpu(*(__le64 *)(pbuf+8));
251 mnr = le64_to_cpu(*(__le64 *)(pbuf+16));
252 inode->i_rdev = MKDEV(mjr, mnr);
253 }
9e294f1c
SF		 254 } else if(memcmp("IntxCHR", pbuf, 8) == 0) {
255 cFYI(1,("Char device"));
3020a1f5 256 inode->i_mode |= S_IFCHR;
86c96b4b
SF		 257 if(bytes_read == 24) {
258 /* we have enough to decode dev num */
259 __u64 mjr; /* major */
260 __u64 mnr; /* minor */
261 mjr = le64_to_cpu(*(__le64 *)(pbuf+8));
262 mnr = le64_to_cpu(*(__le64 *)(pbuf+16));
263 inode->i_rdev = MKDEV(mjr, mnr);
264 }
9e294f1c
SF		 265 } else if(memcmp("IntxLNK", pbuf, 7) == 0) {
266 cFYI(1,("Symlink"));
3020a1f5 267 inode->i_mode |= S_IFLNK;
86c96b4b
SF		 268 } else {
269 inode->i_mode |= S_IFREG; /* file? */
270 rc = -EOPNOTSUPP;
271 }
3020a1f5
SF		 272 } else {
273 inode->i_mode |= S_IFREG; /* then it is a file */
274 rc = -EOPNOTSUPP; /* or some unknown SFU type */
ec637e3f 275 }
d6e2f2a4 276 CIFSSMBClose(xid, pTcon, netfid);
d6e2f2a4
SF		 277 }
278 return rc;
279
280}
281
9e294f1c
SF		 282#define SFBITS_MASK (S_ISVTX | S_ISGID | S_ISUID) /* SETFILEBITS valid bits */
283
284static int get_sfu_uid_mode(struct inode * inode,
285 const unsigned char *path,
286 struct cifs_sb_info *cifs_sb, int xid)
287{
3020a1f5 288#ifdef CONFIG_CIFS_XATTR
9e294f1c
SF		 289 ssize_t rc;
290 char ea_value[4];
291 __u32 mode;
292
293 rc = CIFSSMBQueryEA(xid, cifs_sb->tcon, path, "SETFILEBITS",
294 ea_value, 4 /* size of buf */, cifs_sb->local_nls,
295 cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR);
296 if(rc < 0)
297 return (int)rc;
298 else if (rc > 3) {
299 mode = le32_to_cpu(*((__le32 *)ea_value));
c119b87d 300 inode->i_mode &= ~SFBITS_MASK;
3020a1f5 301 cFYI(1,("special bits 0%o org mode 0%o", mode, inode->i_mode));
9e294f1c
SF		 302 inode->i_mode = (mode & SFBITS_MASK) | inode->i_mode;
303 cFYI(1,("special mode bits 0%o", mode));
304 return 0;
305 } else {
306 return 0;
307 }
3020a1f5
SF		 308#else
309 return -EOPNOTSUPP;
310#endif
311
9e294f1c
SF		 312
313}
314
1da177e4
LT		 315int cifs_get_inode_info(struct inode **pinode,
316 const unsigned char *search_path, FILE_ALL_INFO *pfindData,
317 struct super_block *sb, int xid)
318{
319 int rc = 0;
320 struct cifsTconInfo *pTcon;
321 struct inode *inode;
322 struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
323 char *tmp_path;
324 char *buf = NULL;
8d6286fd 325 int adjustTZ = FALSE;
1da177e4
LT		 326
327 pTcon = cifs_sb->tcon;
d6e2f2a4 328 cFYI(1,("Getting info on %s", search_path));
1da177e4 329
d0d2f2df
SF		 330 if ((pfindData == NULL) && (*pinode != NULL)) {
331 if (CIFS_I(*pinode)->clientCanCacheRead) {
1da177e4
LT		 332 cFYI(1,("No need to revalidate cached inode sizes"));
333 return rc;
334 }
335 }
336
337 /* if file info not passed in then get it from server */
d0d2f2df 338 if (pfindData == NULL) {
1da177e4 339 buf = kmalloc(sizeof(FILE_ALL_INFO), GFP_KERNEL);
d0d2f2df 340 if (buf == NULL)
1da177e4
LT		 341 return -ENOMEM;
342 pfindData = (FILE_ALL_INFO *)buf;
343 /* could do find first instead but this returns more info */
344 rc = CIFSSMBQPathInfo(xid, pTcon, search_path, pfindData,
acf1a1b1 345 0 /* not legacy */,
6b8edfe0 346 cifs_sb->local_nls, cifs_sb->mnt_cifs_flags &
737b758c 347 CIFS_MOUNT_MAP_SPECIAL_CHR);
6b8edfe0
SF		 348 /* BB optimize code so we do not make the above call
349 when server claims no NT SMB support and the above call
350 failed at least once - set flag in tcon or mount */
351 if((rc == -EOPNOTSUPP) || (rc == -EINVAL)) {
352 rc = SMBQueryInformation(xid, pTcon, search_path,
353 pfindData, cifs_sb->local_nls,
354 cifs_sb->mnt_cifs_flags &
355 CIFS_MOUNT_MAP_SPECIAL_CHR);
8d6286fd 356 adjustTZ = TRUE;
6b8edfe0
SF		 357 }
358
1da177e4
LT		 359 }
360 /* dump_mem("\nQPathInfo return data",&findData, sizeof(findData)); */
361 if (rc) {
362 if (rc == -EREMOTE) {
363 tmp_path =
364 kmalloc(strnlen
365 (pTcon->treeName,
366 MAX_TREE_SIZE + 1) +
367 strnlen(search_path, MAX_PATHCONF) + 1,
368 GFP_KERNEL);
369 if (tmp_path == NULL) {
370 kfree(buf);
371 return -ENOMEM;
372 }
373
374 strncpy(tmp_path, pTcon->treeName, MAX_TREE_SIZE);
375 strncat(tmp_path, search_path, MAX_PATHCONF);
376 rc = connect_to_dfs_path(xid, pTcon->ses,
377 /* treename + */ tmp_path,
737b758c
SF		 378 cifs_sb->local_nls,
379 cifs_sb->mnt_cifs_flags &
380 CIFS_MOUNT_MAP_SPECIAL_CHR);
1da177e4
LT		 381 kfree(tmp_path);
382 /* BB fix up inode etc. */
383 } else if (rc) {
384 kfree(buf);
385 return rc;
386 }
387 } else {
388 struct cifsInodeInfo *cifsInfo;
389 __u32 attr = le32_to_cpu(pfindData->Attributes);
390
391 /* get new inode */
392 if (*pinode == NULL) {
393 *pinode = new_inode(sb);
acf1a1b1
SF		 394 if (*pinode == NULL) {
395 kfree(buf);
1da177e4 396 return -ENOMEM;
acf1a1b1 397 }
1da177e4
LT		 398 /* Is an i_ino of zero legal? Can we use that to check
399 if the server supports returning inode numbers? Are
400 there other sanity checks we can use to ensure that
401 the server is really filling in that field? */
402
403 /* We can not use the IndexNumber field by default from
404 Windows or Samba (in ALL_INFO buf) but we can request
405 it explicitly. It may not be unique presumably if
406 the server has multiple devices mounted under one
407 share */
408
409 /* There may be higher info levels that work but are
410 there Windows server or network appliances for which
411 IndexNumber field is not guaranteed unique? */
412
d0d2f2df 413 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM){
1da177e4
LT		 414 int rc1 = 0;
415 __u64 inode_num;
416
417 rc1 = CIFSGetSrvInodeNumber(xid, pTcon,
418 search_path, &inode_num,
737b758c
SF		 419 cifs_sb->local_nls,
420 cifs_sb->mnt_cifs_flags &
421 CIFS_MOUNT_MAP_SPECIAL_CHR);
d0d2f2df 422 if (rc1) {
1da177e4
LT		 423 cFYI(1,("GetSrvInodeNum rc %d", rc1));
424 /* BB EOPNOSUPP disable SERVER_INUM? */
425 } else /* do we need cast or hash to ino? */
426 (*pinode)->i_ino = inode_num;
427 } /* else ino incremented to unique num in new_inode*/
1b2b2126
SF		 428 if(sb->s_flags & MS_NOATIME)
429 (*pinode)->i_flags |= S_NOATIME | S_NOCMTIME;
1da177e4
LT		 430 insert_inode_hash(*pinode);
431 }
432 inode = *pinode;
433 cifsInfo = CIFS_I(inode);
434 cifsInfo->cifsAttrs = attr;
26a21b98 435 cFYI(1, ("Old time %ld", cifsInfo->time));
1da177e4 436 cifsInfo->time = jiffies;
26a21b98 437 cFYI(1, ("New time %ld", cifsInfo->time));
1da177e4
LT		 438
439 /* blksize needs to be multiple of two. So safer to default to
440 blksize and blkbits set in superblock so 2**blkbits and blksize
441 will match rather than setting to:
442 (pTcon->ses->server->maxBuf - MAX_CIFS_HDR_SIZE) & 0xFFFFFE00;*/
443
26a21b98 444 /* Linux can not store file creation time so ignore it */
1bd5bbcb
SF		 445 if(pfindData->LastAccessTime)
446 inode->i_atime = cifs_NTtimeToUnix
447 (le64_to_cpu(pfindData->LastAccessTime));
448 else /* do not need to use current_fs_time - time not stored */
449 inode->i_atime = CURRENT_TIME;
1da177e4
LT		 450 inode->i_mtime =
451 cifs_NTtimeToUnix(le64_to_cpu(pfindData->LastWriteTime));
452 inode->i_ctime =
453 cifs_NTtimeToUnix(le64_to_cpu(pfindData->ChangeTime));
26a21b98 454 cFYI(0, ("Attributes came in as 0x%x", attr));
8d6286fd
SF		 455 if(adjustTZ && (pTcon->ses) && (pTcon->ses->server)) {
456 inode->i_ctime.tv_sec += pTcon->ses->server->timeAdj;
457 inode->i_mtime.tv_sec += pTcon->ses->server->timeAdj;
458 }
1da177e4
LT		 459
460 /* set default mode. will override for dirs below */
461 if (atomic_read(&cifsInfo->inUse) == 0)
462 /* new inode, can safely set these fields */
463 inode->i_mode = cifs_sb->mnt_file_mode;
3020a1f5
SF		 464 else /* since we set the inode type below we need to mask off
465 to avoid strange results if type changes and both get orred in */
466 inode->i_mode &= ~S_IFMT;
1da177e4
LT		 467/* if (attr & ATTR_REPARSE) */
468 /* We no longer handle these as symlinks because we could not
469 follow them due to the absolute path with drive letter */
470 if (attr & ATTR_DIRECTORY) {
471 /* override default perms since we do not do byte range locking
472 on dirs */
473 inode->i_mode = cifs_sb->mnt_dir_mode;
474 inode->i_mode |= S_IFDIR;
eda3c029
SF		 475 } else if ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_UNX_EMUL) &&
476 (cifsInfo->cifsAttrs & ATTR_SYSTEM) &&
477 /* No need to le64 convert size of zero */
478 (pfindData->EndOfFile == 0)) {
479 inode->i_mode = cifs_sb->mnt_file_mode;
480 inode->i_mode |= S_IFIFO;
d6e2f2a4
SF		 481/* BB Finish for SFU style symlinks and devices */
482 } else if ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_UNX_EMUL) &&
483 (cifsInfo->cifsAttrs & ATTR_SYSTEM)) {
484 if (decode_sfu_inode(inode,
485 le64_to_cpu(pfindData->EndOfFile),
486 search_path,
487 cifs_sb, xid)) {
488 cFYI(1,("Unrecognized sfu inode type"));
489 }
3020a1f5 490 cFYI(1,("sfu mode 0%o",inode->i_mode));
1da177e4
LT		 491 } else {
492 inode->i_mode |= S_IFREG;
493 /* treat the dos attribute of read-only as read-only
494 mode e.g. 555 */
495 if (cifsInfo->cifsAttrs & ATTR_READONLY)
496 inode->i_mode &= ~(S_IWUGO);
497 /* BB add code here -
498 validate if device or weird share or device type? */
499 }
3677db10
SF		 500
501 spin_lock(&inode->i_lock);
7ba52631
SF		 502 if (is_size_safe_to_change(cifsInfo, le64_to_cpu(pfindData->EndOfFile))) {
503 /* can not safely shrink the file size here if the
1da177e4
LT		 504 client is writing to it due to potential races */
505 i_size_write(inode,le64_to_cpu(pfindData->EndOfFile));
506
507 /* 512 bytes (2**9) is the fake blocksize that must be
508 used for this calculation */
509 inode->i_blocks = (512 - 1 + le64_to_cpu(
510 pfindData->AllocationSize)) >> 9;
511 }
3677db10 512 spin_unlock(&inode->i_lock);
1da177e4
LT		 513
514 inode->i_nlink = le32_to_cpu(pfindData->NumberOfLinks);
515
516 /* BB fill in uid and gid here? with help from winbind?
517 or retrieve from NTFS stream extended attribute */
9e294f1c
SF		 518 if(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_UNX_EMUL) {
519 /* fill in uid, gid, mode from server ACL */
520 get_sfu_uid_mode(inode, search_path, cifs_sb, xid);
521 } else if (atomic_read(&cifsInfo->inUse) == 0) {
1da177e4
LT		 522 inode->i_uid = cifs_sb->mnt_uid;
523 inode->i_gid = cifs_sb->mnt_gid;
524 /* set so we do not keep refreshing these fields with
525 bad data after user has changed them in memory */
526 atomic_set(&cifsInfo->inUse,1);
527 }
528
529 if (S_ISREG(inode->i_mode)) {
d6e2f2a4 530 cFYI(1, ("File inode"));
1da177e4 531 inode->i_op = &cifs_file_inode_ops;
8b94bcb9
SF		 532 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DIRECT_IO) {
533 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_BRL)
534 inode->i_fop =
535 &cifs_file_direct_nobrl_ops;
536 else
537 inode->i_fop = &cifs_file_direct_ops;
538 } else if(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_BRL)
539 inode->i_fop = &cifs_file_nobrl_ops;
540 else /* not direct, send byte range locks */
1da177e4 541 inode->i_fop = &cifs_file_ops;
8b94bcb9 542
bfa0d75a 543 if(pTcon->ses->server->maxBuf <
273d81d6
DK		 544 PAGE_CACHE_SIZE + MAX_CIFS_HDR_SIZE)
545 inode->i_data.a_ops = &cifs_addr_ops_smallbuf;
546 else
547 inode->i_data.a_ops = &cifs_addr_ops;
1da177e4 548 } else if (S_ISDIR(inode->i_mode)) {
d6e2f2a4 549 cFYI(1, ("Directory inode"));
1da177e4
LT		 550 inode->i_op = &cifs_dir_inode_ops;
551 inode->i_fop = &cifs_dir_ops;
552 } else if (S_ISLNK(inode->i_mode)) {
d6e2f2a4 553 cFYI(1, ("Symbolic Link inode"));
1da177e4
LT		 554 inode->i_op = &cifs_symlink_inode_ops;
555 } else {
556 init_special_inode(inode, inode->i_mode,
557 inode->i_rdev);
558 }
559 }
560 kfree(buf);
561 return rc;
562}
563
564/* gets root inode */
565void cifs_read_inode(struct inode *inode)
566{
567 int xid;
568 struct cifs_sb_info *cifs_sb;
569
570 cifs_sb = CIFS_SB(inode->i_sb);
571 xid = GetXid();
572 if (cifs_sb->tcon->ses->capabilities & CAP_UNIX)
573 cifs_get_inode_info_unix(&inode, "", inode->i_sb,xid);
574 else
575 cifs_get_inode_info(&inode, "", NULL, inode->i_sb,xid);
576 /* can not call macro FreeXid here since in a void func */
577 _FreeXid(xid);
578}
579
580int cifs_unlink(struct inode *inode, struct dentry *direntry)
581{
582 int rc = 0;
583 int xid;
584 struct cifs_sb_info *cifs_sb;
585 struct cifsTconInfo *pTcon;
586 char *full_path = NULL;
587 struct cifsInodeInfo *cifsInode;
588 FILE_BASIC_INFO *pinfo_buf;
589
06bcfedd 590 cFYI(1, ("cifs_unlink, inode = 0x%p", inode));
1da177e4
LT		 591
592 xid = GetXid();
593
6910ab30
SF		 594 if(inode)
595 cifs_sb = CIFS_SB(inode->i_sb);
596 else
06bcfedd 597 cifs_sb = CIFS_SB(direntry->d_sb);
1da177e4
LT		 598 pTcon = cifs_sb->tcon;
599
600 /* Unlink can be called from rename so we can not grab the sem here
601 since we deadlock otherwise */
a11f3a05 602/* mutex_lock(&direntry->d_sb->s_vfs_rename_mutex);*/
7f57356b 603 full_path = build_path_from_dentry(direntry);
a11f3a05 604/* mutex_unlock(&direntry->d_sb->s_vfs_rename_mutex);*/
1da177e4
LT		 605 if (full_path == NULL) {
606 FreeXid(xid);
607 return -ENOMEM;
608 }
737b758c
SF		 609 rc = CIFSSMBDelFile(xid, pTcon, full_path, cifs_sb->local_nls,
610 cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR);
1da177e4
LT		 611
612 if (!rc) {
d0d2f2df 613 if (direntry->d_inode)
9a53c3a7 614 drop_nlink(direntry->d_inode);
1da177e4
LT		 615 } else if (rc == -ENOENT) {
616 d_drop(direntry);
617 } else if (rc == -ETXTBSY) {
618 int oplock = FALSE;
619 __u16 netfid;
620
621 rc = CIFSSMBOpen(xid, pTcon, full_path, FILE_OPEN, DELETE,
622 CREATE_NOT_DIR | CREATE_DELETE_ON_CLOSE,
737b758c
SF		 623 &netfid, &oplock, NULL, cifs_sb->local_nls,
624 cifs_sb->mnt_cifs_flags &
625 CIFS_MOUNT_MAP_SPECIAL_CHR);
1da177e4
LT		 626 if (rc==0) {
627 CIFSSMBRenameOpenFile(xid, pTcon, netfid, NULL,
737b758c
SF		 628 cifs_sb->local_nls,
629 cifs_sb->mnt_cifs_flags &
630 CIFS_MOUNT_MAP_SPECIAL_CHR);
1da177e4 631 CIFSSMBClose(xid, pTcon, netfid);
d0d2f2df 632 if (direntry->d_inode)
9a53c3a7 633 drop_nlink(direntry->d_inode);
1da177e4
LT		 634 }
635 } else if (rc == -EACCES) {
636 /* try only if r/o attribute set in local lookup data? */
a048d7a8 637 pinfo_buf = kzalloc(sizeof(FILE_BASIC_INFO), GFP_KERNEL);
1da177e4 638 if (pinfo_buf) {
1da177e4
LT		 639 /* ATTRS set to normal clears r/o bit */
640 pinfo_buf->Attributes = cpu_to_le32(ATTR_NORMAL);
641 if (!(pTcon->ses->flags & CIFS_SES_NT4))
642 rc = CIFSSMBSetTimes(xid, pTcon, full_path,
643 pinfo_buf,
737b758c
SF		 644 cifs_sb->local_nls,
645 cifs_sb->mnt_cifs_flags &
646 CIFS_MOUNT_MAP_SPECIAL_CHR);
1da177e4
LT		 647 else
648 rc = -EOPNOTSUPP;
649
650 if (rc == -EOPNOTSUPP) {
651 int oplock = FALSE;
652 __u16 netfid;
653 /* rc = CIFSSMBSetAttrLegacy(xid, pTcon,
654 full_path,
655 (__u16)ATTR_NORMAL,
656 cifs_sb->local_nls);
657 For some strange reason it seems that NT4 eats the
658 old setattr call without actually setting the
659 attributes so on to the third attempted workaround
660 */
661
662 /* BB could scan to see if we already have it open
663 and pass in pid of opener to function */
664 rc = CIFSSMBOpen(xid, pTcon, full_path,
665 FILE_OPEN, SYNCHRONIZE |
666 FILE_WRITE_ATTRIBUTES, 0,
667 &netfid, &oplock, NULL,
737b758c
SF		 668 cifs_sb->local_nls,
669 cifs_sb->mnt_cifs_flags &
670 CIFS_MOUNT_MAP_SPECIAL_CHR);
1da177e4
LT		 671 if (rc==0) {
672 rc = CIFSSMBSetFileTimes(xid, pTcon,
673 pinfo_buf,
674 netfid);
675 CIFSSMBClose(xid, pTcon, netfid);
676 }
677 }
678 kfree(pinfo_buf);
679 }
680 if (rc==0) {
737b758c
SF		 681 rc = CIFSSMBDelFile(xid, pTcon, full_path,
682 cifs_sb->local_nls,
683 cifs_sb->mnt_cifs_flags &
684 CIFS_MOUNT_MAP_SPECIAL_CHR);
1da177e4 685 if (!rc) {
d0d2f2df 686 if (direntry->d_inode)
9a53c3a7 687 drop_nlink(direntry->d_inode);
1da177e4
LT		 688 } else if (rc == -ETXTBSY) {
689 int oplock = FALSE;
690 __u16 netfid;
691
692 rc = CIFSSMBOpen(xid, pTcon, full_path,
693 FILE_OPEN, DELETE,
694 CREATE_NOT_DIR |
695 CREATE_DELETE_ON_CLOSE,
696 &netfid, &oplock, NULL,
737b758c
SF		 697 cifs_sb->local_nls,
698 cifs_sb->mnt_cifs_flags &
699 CIFS_MOUNT_MAP_SPECIAL_CHR);
1da177e4
LT		 700 if (rc==0) {
701 CIFSSMBRenameOpenFile(xid, pTcon,
702 netfid, NULL,
737b758c
SF		 703 cifs_sb->local_nls,
704 cifs_sb->mnt_cifs_flags &
705 CIFS_MOUNT_MAP_SPECIAL_CHR);
1da177e4 706 CIFSSMBClose(xid, pTcon, netfid);
d0d2f2df 707 if (direntry->d_inode)
9a53c3a7 708 drop_nlink(direntry->d_inode);
1da177e4
LT		 709 }
710 /* BB if rc = -ETXTBUSY goto the rename logic BB */
711 }
712 }
713 }
d0d2f2df 714 if (direntry->d_inode) {
b2aeb9d5
SF		 715 cifsInode = CIFS_I(direntry->d_inode);
716 cifsInode->time = 0; /* will force revalidate to get info
717 when needed */
718 direntry->d_inode->i_ctime = current_fs_time(inode->i_sb);
719 }
06bcfedd
SF		 720 if(inode) {
721 inode->i_ctime = inode->i_mtime = current_fs_time(inode->i_sb);
722 cifsInode = CIFS_I(inode);
723 cifsInode->time = 0; /* force revalidate of dir as well */
724 }
1da177e4
LT		 725
726 kfree(full_path);
727 FreeXid(xid);
728 return rc;
729}
730
731int cifs_mkdir(struct inode *inode, struct dentry *direntry, int mode)
732{
733 int rc = 0;
734 int xid;
735 struct cifs_sb_info *cifs_sb;
736 struct cifsTconInfo *pTcon;
737 char *full_path = NULL;
738 struct inode *newinode = NULL;
739
6473a559 740 cFYI(1, ("In cifs_mkdir, mode = 0x%x inode = 0x%p", mode, inode));
1da177e4
LT		 741
742 xid = GetXid();
743
744 cifs_sb = CIFS_SB(inode->i_sb);
745 pTcon = cifs_sb->tcon;
746
7f57356b 747 full_path = build_path_from_dentry(direntry);
1da177e4
LT		 748 if (full_path == NULL) {
749 FreeXid(xid);
750 return -ENOMEM;
751 }
752 /* BB add setting the equivalent of mode via CreateX w/ACLs */
737b758c
SF		 753 rc = CIFSSMBMkDir(xid, pTcon, full_path, cifs_sb->local_nls,
754 cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR);
1da177e4 755 if (rc) {
26a21b98 756 cFYI(1, ("cifs_mkdir returned 0x%x", rc));
1da177e4
LT		 757 d_drop(direntry);
758 } else {
d8c76e6f 759 inc_nlink(inode);
1da177e4
LT		 760 if (pTcon->ses->capabilities & CAP_UNIX)
761 rc = cifs_get_inode_info_unix(&newinode, full_path,
762 inode->i_sb,xid);
763 else
764 rc = cifs_get_inode_info(&newinode, full_path, NULL,
765 inode->i_sb,xid);
766
b92327fe
SF		 767 if (pTcon->nocase)
768 direntry->d_op = &cifs_ci_dentry_ops;
769 else
770 direntry->d_op = &cifs_dentry_ops;
1da177e4
LT		 771 d_instantiate(direntry, newinode);
772 if (direntry->d_inode)
773 direntry->d_inode->i_nlink = 2;
774 if (cifs_sb->tcon->ses->capabilities & CAP_UNIX)
d0d2f2df 775 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SET_UID) {
1da177e4
LT		 776 CIFSSMBUnixSetPerms(xid, pTcon, full_path,
777 mode,
83451879
SF		 778 (__u64)current->fsuid,
779 (__u64)current->fsgid,
1da177e4 780 0 /* dev_t */,
737b758c
SF		 781 cifs_sb->local_nls,
782 cifs_sb->mnt_cifs_flags &
783 CIFS_MOUNT_MAP_SPECIAL_CHR);
1da177e4
LT		 784 } else {
785 CIFSSMBUnixSetPerms(xid, pTcon, full_path,
786 mode, (__u64)-1,
787 (__u64)-1, 0 /* dev_t */,
737b758c
SF		 788 cifs_sb->local_nls,
789 cifs_sb->mnt_cifs_flags &
790 CIFS_MOUNT_MAP_SPECIAL_CHR);
1da177e4
LT		 791 }
792 else {
793 /* BB to be implemented via Windows secrty descriptors
794 eg CIFSSMBWinSetPerms(xid, pTcon, full_path, mode,
795 -1, -1, local_nls); */
6473a559
SF		 796 if(direntry->d_inode) {
797 direntry->d_inode->i_mode = mode;
25741b3e 798 direntry->d_inode->i_mode |= S_IFDIR;
6473a559
SF		 799 if(cifs_sb->mnt_cifs_flags &
800 CIFS_MOUNT_SET_UID) {
801 direntry->d_inode->i_uid =
802 current->fsuid;
803 direntry->d_inode->i_gid =
804 current->fsgid;
805 }
806 }
2a138ebb 807 }
1da177e4
LT		 808 }
809 kfree(full_path);
810 FreeXid(xid);
811 return rc;
812}
813
814int cifs_rmdir(struct inode *inode, struct dentry *direntry)
815{
816 int rc = 0;
817 int xid;
818 struct cifs_sb_info *cifs_sb;
819 struct cifsTconInfo *pTcon;
820 char *full_path = NULL;
821 struct cifsInodeInfo *cifsInode;
822
26a21b98 823 cFYI(1, ("cifs_rmdir, inode = 0x%p", inode));
1da177e4
LT		 824
825 xid = GetXid();
826
827 cifs_sb = CIFS_SB(inode->i_sb);
828 pTcon = cifs_sb->tcon;
829
7f57356b 830 full_path = build_path_from_dentry(direntry);
1da177e4
LT		 831 if (full_path == NULL) {
832 FreeXid(xid);
833 return -ENOMEM;
834 }
835
737b758c
SF		 836 rc = CIFSSMBRmDir(xid, pTcon, full_path, cifs_sb->local_nls,
837 cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR);
1da177e4
LT		 838
839 if (!rc) {
9a53c3a7 840 drop_nlink(inode);
3677db10 841 spin_lock(&direntry->d_inode->i_lock);
1da177e4 842 i_size_write(direntry->d_inode,0);
ce71ec36 843 clear_nlink(direntry->d_inode);
3677db10 844 spin_unlock(&direntry->d_inode->i_lock);
1da177e4
LT		 845 }
846
847 cifsInode = CIFS_I(direntry->d_inode);
848 cifsInode->time = 0; /* force revalidate to go get info when
849 needed */
850 direntry->d_inode->i_ctime = inode->i_ctime = inode->i_mtime =
851 current_fs_time(inode->i_sb);
852
853 kfree(full_path);
854 FreeXid(xid);
855 return rc;
856}
857
858int cifs_rename(struct inode *source_inode, struct dentry *source_direntry,
859 struct inode *target_inode, struct dentry *target_direntry)
860{
861 char *fromName;
862 char *toName;
863 struct cifs_sb_info *cifs_sb_source;
864 struct cifs_sb_info *cifs_sb_target;
865 struct cifsTconInfo *pTcon;
866 int xid;
867 int rc = 0;
868
869 xid = GetXid();
870
871 cifs_sb_target = CIFS_SB(target_inode->i_sb);
872 cifs_sb_source = CIFS_SB(source_inode->i_sb);
873 pTcon = cifs_sb_source->tcon;
874
875 if (pTcon != cifs_sb_target->tcon) {
876 FreeXid(xid);
877 return -EXDEV; /* BB actually could be allowed if same server,
878 but different share.
879 Might eventually add support for this */
880 }
881
882 /* we already have the rename sem so we do not need to grab it again
883 here to protect the path integrity */
7f57356b
SF		 884 fromName = build_path_from_dentry(source_direntry);
885 toName = build_path_from_dentry(target_direntry);
1da177e4
LT		 886 if ((fromName == NULL) || (toName == NULL)) {
887 rc = -ENOMEM;
888 goto cifs_rename_exit;
889 }
890
891 rc = CIFSSMBRename(xid, pTcon, fromName, toName,
737b758c
SF		 892 cifs_sb_source->local_nls,
893 cifs_sb_source->mnt_cifs_flags &
894 CIFS_MOUNT_MAP_SPECIAL_CHR);
1da177e4
LT		 895 if (rc == -EEXIST) {
896 /* check if they are the same file because rename of hardlinked
897 files is a noop */
898 FILE_UNIX_BASIC_INFO *info_buf_source;
899 FILE_UNIX_BASIC_INFO *info_buf_target;
900
901 info_buf_source =
902 kmalloc(2 * sizeof(FILE_UNIX_BASIC_INFO), GFP_KERNEL);
903 if (info_buf_source != NULL) {
904 info_buf_target = info_buf_source + 1;
8e87d4dc
SF		 905 if (pTcon->ses->capabilities & CAP_UNIX)
906 rc = CIFSSMBUnixQPathInfo(xid, pTcon, fromName,
907 info_buf_source,
908 cifs_sb_source->local_nls,
909 cifs_sb_source->mnt_cifs_flags &
910 CIFS_MOUNT_MAP_SPECIAL_CHR);
911 /* else rc is still EEXIST so will fall through to
912 unlink the target and retry rename */
1da177e4
LT		 913 if (rc == 0) {
914 rc = CIFSSMBUnixQPathInfo(xid, pTcon, toName,
915 info_buf_target,
737b758c
SF		 916 cifs_sb_target->local_nls,
917 /* remap based on source sb */
918 cifs_sb_source->mnt_cifs_flags &
919 CIFS_MOUNT_MAP_SPECIAL_CHR);
1da177e4
LT		 920 }
921 if ((rc == 0) &&
922 (info_buf_source->UniqueId ==
923 info_buf_target->UniqueId)) {
924 /* do not rename since the files are hardlinked which
925 is a noop */
926 } else {
927 /* we either can not tell the files are hardlinked
928 (as with Windows servers) or files are not
929 hardlinked so delete the target manually before
930 renaming to follow POSIX rather than Windows
931 semantics */
932 cifs_unlink(target_inode, target_direntry);
933 rc = CIFSSMBRename(xid, pTcon, fromName,
934 toName,
737b758c
SF		 935 cifs_sb_source->local_nls,
936 cifs_sb_source->mnt_cifs_flags
937 & CIFS_MOUNT_MAP_SPECIAL_CHR);
1da177e4
LT		 938 }
939 kfree(info_buf_source);
940 } /* if we can not get memory just leave rc as EEXIST */
941 }
942
943 if (rc) {
944 cFYI(1, ("rename rc %d", rc));
945 }
946
947 if ((rc == -EIO) || (rc == -EEXIST)) {
948 int oplock = FALSE;
949 __u16 netfid;
950
951 /* BB FIXME Is Generic Read correct for rename? */
952 /* if renaming directory - we should not say CREATE_NOT_DIR,
953 need to test renaming open directory, also GENERIC_READ
954 might not right be right access to request */
955 rc = CIFSSMBOpen(xid, pTcon, fromName, FILE_OPEN, GENERIC_READ,
956 CREATE_NOT_DIR, &netfid, &oplock, NULL,
737b758c
SF		 957 cifs_sb_source->local_nls,
958 cifs_sb_source->mnt_cifs_flags &
959 CIFS_MOUNT_MAP_SPECIAL_CHR);
1da177e4 960 if (rc==0) {
8e87d4dc 961 rc = CIFSSMBRenameOpenFile(xid, pTcon, netfid, toName,
737b758c
SF		 962 cifs_sb_source->local_nls,
963 cifs_sb_source->mnt_cifs_flags &
964 CIFS_MOUNT_MAP_SPECIAL_CHR);
1da177e4
LT		 965 CIFSSMBClose(xid, pTcon, netfid);
966 }
967 }
968
969cifs_rename_exit:
970 kfree(fromName);
971 kfree(toName);
972 FreeXid(xid);
973 return rc;
974}
975
976int cifs_revalidate(struct dentry *direntry)
977{
978 int xid;
979 int rc = 0;
980 char *full_path;
981 struct cifs_sb_info *cifs_sb;
982 struct cifsInodeInfo *cifsInode;
983 loff_t local_size;
984 struct timespec local_mtime;
985 int invalidate_inode = FALSE;
986
987 if (direntry->d_inode == NULL)
988 return -ENOENT;
989
990 cifsInode = CIFS_I(direntry->d_inode);
991
992 if (cifsInode == NULL)
993 return -ENOENT;
994
995 /* no sense revalidating inode info on file that no one can write */
996 if (CIFS_I(direntry->d_inode)->clientCanCacheRead)
997 return rc;
998
999 xid = GetXid();
1000
1001 cifs_sb = CIFS_SB(direntry->d_sb);
1002
1003 /* can not safely grab the rename sem here if rename calls revalidate
1004 since that would deadlock */
7f57356b 1005 full_path = build_path_from_dentry(direntry);
1da177e4
LT		 1006 if (full_path == NULL) {
1007 FreeXid(xid);
1008 return -ENOMEM;
1009 }
1010 cFYI(1, ("Revalidate: %s inode 0x%p count %d dentry: 0x%p d_time %ld "
1011 "jiffies %ld", full_path, direntry->d_inode,
1012 direntry->d_inode->i_count.counter, direntry,
1013 direntry->d_time, jiffies));
1014
1015 if (cifsInode->time == 0) {
1016 /* was set to zero previously to force revalidate */
1017 } else if (time_before(jiffies, cifsInode->time + HZ) &&
1018 lookupCacheEnabled) {
1019 if ((S_ISREG(direntry->d_inode->i_mode) == 0) ||
1020 (direntry->d_inode->i_nlink == 1)) {
1021 kfree(full_path);
1022 FreeXid(xid);
1023 return rc;
1024 } else {
1025 cFYI(1, ("Have to revalidate file due to hardlinks"));
1026 }
1027 }
1028
1029 /* save mtime and size */
1030 local_mtime = direntry->d_inode->i_mtime;
1031 local_size = direntry->d_inode->i_size;
1032
1033 if (cifs_sb->tcon->ses->capabilities & CAP_UNIX) {
1034 rc = cifs_get_inode_info_unix(&direntry->d_inode, full_path,
1035 direntry->d_sb,xid);
1036 if (rc) {
1037 cFYI(1, ("error on getting revalidate info %d", rc));
1038/* if (rc != -ENOENT)
1039 rc = 0; */ /* BB should we cache info on
1040 certain errors? */
1041 }
1042 } else {
1043 rc = cifs_get_inode_info(&direntry->d_inode, full_path, NULL,
1044 direntry->d_sb,xid);
1045 if (rc) {
1046 cFYI(1, ("error on getting revalidate info %d", rc));
1047/* if (rc != -ENOENT)
1048 rc = 0; */ /* BB should we cache info on
1049 certain errors? */
1050 }
1051 }
1052 /* should we remap certain errors, access denied?, to zero */
1053
1054 /* if not oplocked, we invalidate inode pages if mtime or file size
1055 had changed on server */
1056
1057 if (timespec_equal(&local_mtime,&direntry->d_inode->i_mtime) &&
1058 (local_size == direntry->d_inode->i_size)) {
1059 cFYI(1, ("cifs_revalidate - inode unchanged"));
1060 } else {
1061 /* file may have changed on server */
1062 if (cifsInode->clientCanCacheRead) {
1063 /* no need to invalidate inode pages since we were the
1064 only ones who could have modified the file and the
1065 server copy is staler than ours */
1066 } else {
1067 invalidate_inode = TRUE;
1068 }
1069 }
1070
1071 /* can not grab this sem since kernel filesys locking documentation
1b1dcc1b
JS		 1072 indicates i_mutex may be taken by the kernel on lookup and rename
1073 which could deadlock if we grab the i_mutex here as well */
1074/* mutex_lock(&direntry->d_inode->i_mutex);*/
1da177e4
LT		 1075 /* need to write out dirty pages here */
1076 if (direntry->d_inode->i_mapping) {
1077 /* do we need to lock inode until after invalidate completes
1078 below? */
1079 filemap_fdatawrite(direntry->d_inode->i_mapping);
1080 }
1081 if (invalidate_inode) {
3abb9272
SF		 1082 /* shrink_dcache not necessary now that cifs dentry ops
1083 are exported for negative dentries */
1084/* if(S_ISDIR(direntry->d_inode->i_mode))
1085 shrink_dcache_parent(direntry); */
1086 if (S_ISREG(direntry->d_inode->i_mode)) {
1087 if (direntry->d_inode->i_mapping)
1088 filemap_fdatawait(direntry->d_inode->i_mapping);
1089 /* may eventually have to do this for open files too */
1090 if (list_empty(&(cifsInode->openFileList))) {
1091 /* changed on server - flush read ahead pages */
1092 cFYI(1, ("Invalidating read ahead data on "
1093 "closed file"));
1094 invalidate_remote_inode(direntry->d_inode);
1095 }
1da177e4
LT		 1096 }
1097 }
1b1dcc1b 1098/* mutex_unlock(&direntry->d_inode->i_mutex); */
1da177e4
LT		 1099
1100 kfree(full_path);
1101 FreeXid(xid);
1102 return rc;
1103}
1104
1105int cifs_getattr(struct vfsmount *mnt, struct dentry *dentry,
1106 struct kstat *stat)
1107{
1108 int err = cifs_revalidate(dentry);
5fe14c85 1109 if (!err) {
1da177e4 1110 generic_fillattr(dentry->d_inode, stat);
5fe14c85
SF		 1111 stat->blksize = CIFS_MAX_MSGSIZE;
1112 }
1da177e4
LT		 1113 return err;
1114}
1115
1116static int cifs_truncate_page(struct address_space *mapping, loff_t from)
1117{
1118 pgoff_t index = from >> PAGE_CACHE_SHIFT;
1119 unsigned offset = from & (PAGE_CACHE_SIZE - 1);
1120 struct page *page;
1121 char *kaddr;
1122 int rc = 0;
1123
1124 page = grab_cache_page(mapping, index);
1125 if (!page)
1126 return -ENOMEM;
1127
1128 kaddr = kmap_atomic(page, KM_USER0);
1129 memset(kaddr + offset, 0, PAGE_CACHE_SIZE - offset);
1130 flush_dcache_page(page);
1131 kunmap_atomic(kaddr, KM_USER0);
1132 unlock_page(page);
1133 page_cache_release(page);
1134 return rc;
1135}
1136
3677db10
SF		 1137int cifs_vmtruncate(struct inode * inode, loff_t offset)
1138{
1139 struct address_space *mapping = inode->i_mapping;
1140 unsigned long limit;
1141
1142 if (inode->i_size < offset)
1143 goto do_expand;
1144 /*
1145 * truncation of in-use swapfiles is disallowed - it would cause
1146 * subsequent swapout to scribble on the now-freed blocks.
1147 */
1148 if (IS_SWAPFILE(inode))
1149 goto out_busy;
1150 spin_lock(&inode->i_lock);
1151 i_size_write(inode, offset);
1152 spin_unlock(&inode->i_lock);
1153 unmap_mapping_range(mapping, offset + PAGE_SIZE - 1, 0, 1);
1154 truncate_inode_pages(mapping, offset);
1155 goto out_truncate;
1156
1157do_expand:
1158 limit = current->signal->rlim[RLIMIT_FSIZE].rlim_cur;
1159 if (limit != RLIM_INFINITY && offset > limit)
1160 goto out_sig;
1161 if (offset > inode->i_sb->s_maxbytes)
1162 goto out_big;
1163 i_size_write(inode, offset);
1164
1165out_truncate:
1166 if (inode->i_op && inode->i_op->truncate)
1167 inode->i_op->truncate(inode);
1168 return 0;
1169out_sig:
1170 send_sig(SIGXFSZ, current, 0);
1171out_big:
1172 return -EFBIG;
1173out_busy:
1174 return -ETXTBSY;
1175}
1176
1da177e4
LT		 1177int cifs_setattr(struct dentry *direntry, struct iattr *attrs)
1178{
1179 int xid;
1180 struct cifs_sb_info *cifs_sb;
1181 struct cifsTconInfo *pTcon;
1182 char *full_path = NULL;
1183 int rc = -EACCES;
1da177e4
LT		 1184 struct cifsFileInfo *open_file = NULL;
1185 FILE_BASIC_INFO time_buf;
1186 int set_time = FALSE;
1187 __u64 mode = 0xFFFFFFFFFFFFFFFFULL;
1188 __u64 uid = 0xFFFFFFFFFFFFFFFFULL;
1189 __u64 gid = 0xFFFFFFFFFFFFFFFFULL;
1190 struct cifsInodeInfo *cifsInode;
1da177e4
LT		 1191
1192 xid = GetXid();
1193
3979877e 1194 cFYI(1, ("setattr on file %s attrs->iavalid 0x%x",
1da177e4 1195 direntry->d_name.name, attrs->ia_valid));
6473a559 1196
1da177e4
LT		 1197 cifs_sb = CIFS_SB(direntry->d_inode->i_sb);
1198 pTcon = cifs_sb->tcon;
1199
2a138ebb 1200 if ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_PERM) == 0) {
6473a559
SF		 1201 /* check if we have permission to change attrs */
1202 rc = inode_change_ok(direntry->d_inode, attrs);
1203 if(rc < 0) {
1204 FreeXid(xid);
1205 return rc;
1206 } else
1207 rc = 0;
1208 }
1209
7f57356b 1210 full_path = build_path_from_dentry(direntry);
1da177e4
LT		 1211 if (full_path == NULL) {
1212 FreeXid(xid);
1213 return -ENOMEM;
1214 }
1215 cifsInode = CIFS_I(direntry->d_inode);
1216
1217 /* BB check if we need to refresh inode from server now ? BB */
1218
1219 /* need to flush data before changing file size on server */
28fd1298 1220 filemap_write_and_wait(direntry->d_inode->i_mapping);
1da177e4
LT		 1221
1222 if (attrs->ia_valid & ATTR_SIZE) {
1da177e4
LT		 1223 /* To avoid spurious oplock breaks from server, in the case of
1224 inodes that we already have open, avoid doing path based
1225 setting of file size if we can do it by handle.
1226 This keeps our caching token (oplock) and avoids timeouts
1227 when the local oplock break takes longer to flush
1228 writebehind data than the SMB timeout for the SetPathInfo
1229 request would allow */
3979877e 1230
6148a742
SF		 1231 open_file = find_writable_file(cifsInode);
1232 if (open_file) {
1233 __u16 nfid = open_file->netfid;
1234 __u32 npid = open_file->pid;
1235 rc = CIFSSMBSetFileSize(xid, pTcon, attrs->ia_size,
1236 nfid, npid, FALSE);
23e7dd7d 1237 atomic_dec(&open_file->wrtPending);
6148a742 1238 cFYI(1,("SetFSize for attrs rc = %d", rc));
083d3a2c 1239 if((rc == -EINVAL) || (rc == -EOPNOTSUPP)) {
6148a742
SF		 1240 int bytes_written;
1241 rc = CIFSSMBWrite(xid, pTcon,
1242 nfid, 0, attrs->ia_size,
1243 &bytes_written, NULL, NULL,
1244 1 /* 45 seconds */);
1245 cFYI(1,("Wrt seteof rc %d", rc));
1da177e4 1246 }
6473a559
SF		 1247 } else
1248 rc = -EINVAL;
1249
1da177e4
LT		 1250 if (rc != 0) {
1251 /* Set file size by pathname rather than by handle
1252 either because no valid, writeable file handle for
1253 it was found or because there was an error setting
1254 it by handle */
1255 rc = CIFSSMBSetEOF(xid, pTcon, full_path,
1256 attrs->ia_size, FALSE,
737b758c
SF		 1257 cifs_sb->local_nls,
1258 cifs_sb->mnt_cifs_flags &
1259 CIFS_MOUNT_MAP_SPECIAL_CHR);
e30dcf3a 1260 cFYI(1, ("SetEOF by path (setattrs) rc = %d", rc));
083d3a2c 1261 if((rc == -EINVAL) || (rc == -EOPNOTSUPP)) {
e30dcf3a
SF		 1262 __u16 netfid;
1263 int oplock = FALSE;
1264
1265 rc = SMBLegacyOpen(xid, pTcon, full_path,
1266 FILE_OPEN,
1267 SYNCHRONIZE | FILE_WRITE_ATTRIBUTES,
1268 CREATE_NOT_DIR, &netfid, &oplock,
1269 NULL, cifs_sb->local_nls,
1270 cifs_sb->mnt_cifs_flags &
1271 CIFS_MOUNT_MAP_SPECIAL_CHR);
1272 if (rc==0) {
1273 int bytes_written;
1274 rc = CIFSSMBWrite(xid, pTcon,
1275 netfid, 0,
1276 attrs->ia_size,
1277 &bytes_written, NULL,
1278 NULL, 1 /* 45 sec */);
1279 cFYI(1,("wrt seteof rc %d",rc));
1280 CIFSSMBClose(xid, pTcon, netfid);
1281 }
1282
1283 }
1da177e4
LT		 1284 }
1285
1286 /* Server is ok setting allocation size implicitly - no need
1287 to call:
1288 CIFSSMBSetEOF(xid, pTcon, full_path, attrs->ia_size, TRUE,
1289 cifs_sb->local_nls);
1290 */
1291
1292 if (rc == 0) {
3677db10 1293 rc = cifs_vmtruncate(direntry->d_inode, attrs->ia_size);
1da177e4
LT		 1294 cifs_truncate_page(direntry->d_inode->i_mapping,
1295 direntry->d_inode->i_size);
e30dcf3a
SF		 1296 } else
1297 goto cifs_setattr_exit;
1da177e4
LT		 1298 }
1299 if (attrs->ia_valid & ATTR_UID) {
e30dcf3a 1300 cFYI(1, ("UID changed to %d", attrs->ia_uid));
1da177e4 1301 uid = attrs->ia_uid;
1da177e4
LT		 1302 }
1303 if (attrs->ia_valid & ATTR_GID) {
e30dcf3a 1304 cFYI(1, ("GID changed to %d", attrs->ia_gid));
1da177e4 1305 gid = attrs->ia_gid;
1da177e4
LT		 1306 }
1307
1308 time_buf.Attributes = 0;
1309 if (attrs->ia_valid & ATTR_MODE) {
e30dcf3a 1310 cFYI(1, ("Mode changed to 0x%x", attrs->ia_mode));
1da177e4 1311 mode = attrs->ia_mode;
1da177e4
LT		 1312 }
1313
1314 if ((cifs_sb->tcon->ses->capabilities & CAP_UNIX)
1315 && (attrs->ia_valid & (ATTR_MODE | ATTR_GID | ATTR_UID)))
1316 rc = CIFSSMBUnixSetPerms(xid, pTcon, full_path, mode, uid, gid,
737b758c
SF		 1317 0 /* dev_t */, cifs_sb->local_nls,
1318 cifs_sb->mnt_cifs_flags &
1319 CIFS_MOUNT_MAP_SPECIAL_CHR);
1da177e4 1320 else if (attrs->ia_valid & ATTR_MODE) {
cdbce9c8 1321 rc = 0;
1da177e4
LT		 1322 if ((mode & S_IWUGO) == 0) /* not writeable */ {
1323 if ((cifsInode->cifsAttrs & ATTR_READONLY) == 0)
1324 time_buf.Attributes =
1325 cpu_to_le32(cifsInode->cifsAttrs |
1326 ATTR_READONLY);
1327 } else if ((mode & S_IWUGO) == S_IWUGO) {
1328 if (cifsInode->cifsAttrs & ATTR_READONLY)
1329 time_buf.Attributes =
1330 cpu_to_le32(cifsInode->cifsAttrs &
1331 (~ATTR_READONLY));
1332 }
1333 /* BB to be implemented -
1334 via Windows security descriptors or streams */
1335 /* CIFSSMBWinSetPerms(xid, pTcon, full_path, mode, uid, gid,
1336 cifs_sb->local_nls); */
1337 }
1338
1339 if (attrs->ia_valid & ATTR_ATIME) {
1340 set_time = TRUE;
1341 time_buf.LastAccessTime =
1342 cpu_to_le64(cifs_UnixTimeToNT(attrs->ia_atime));
1343 } else
1344 time_buf.LastAccessTime = 0;
1345
1346 if (attrs->ia_valid & ATTR_MTIME) {
1347 set_time = TRUE;
1348 time_buf.LastWriteTime =
1349 cpu_to_le64(cifs_UnixTimeToNT(attrs->ia_mtime));
1350 } else
1351 time_buf.LastWriteTime = 0;
e30dcf3a
SF		 1352 /* Do not set ctime explicitly unless other time
1353 stamps are changed explicitly (i.e. by utime()
1354 since we would then have a mix of client and
1355 server times */
1356
1357 if (set_time && (attrs->ia_valid & ATTR_CTIME)) {
1da177e4 1358 set_time = TRUE;
e30dcf3a
SF		 1359 /* Although Samba throws this field away
1360 it may be useful to Windows - but we do
1361 not want to set ctime unless some other
1362 timestamp is changing */
26a21b98 1363 cFYI(1, ("CIFS - CTIME changed"));
1da177e4
LT		 1364 time_buf.ChangeTime =
1365 cpu_to_le64(cifs_UnixTimeToNT(attrs->ia_ctime));
1366 } else
1367 time_buf.ChangeTime = 0;
1368
1369 if (set_time || time_buf.Attributes) {
1da177e4
LT		 1370 time_buf.CreationTime = 0; /* do not change */
1371 /* In the future we should experiment - try setting timestamps
1372 via Handle (SetFileInfo) instead of by path */
1373 if (!(pTcon->ses->flags & CIFS_SES_NT4))
1374 rc = CIFSSMBSetTimes(xid, pTcon, full_path, &time_buf,
737b758c
SF		 1375 cifs_sb->local_nls,
1376 cifs_sb->mnt_cifs_flags &
1377 CIFS_MOUNT_MAP_SPECIAL_CHR);
1da177e4
LT		 1378 else
1379 rc = -EOPNOTSUPP;
1380
1381 if (rc == -EOPNOTSUPP) {
1382 int oplock = FALSE;
1383 __u16 netfid;
1384
1385 cFYI(1, ("calling SetFileInfo since SetPathInfo for "
1386 "times not supported by this server"));
1387 /* BB we could scan to see if we already have it open
1388 and pass in pid of opener to function */
1389 rc = CIFSSMBOpen(xid, pTcon, full_path, FILE_OPEN,
1390 SYNCHRONIZE | FILE_WRITE_ATTRIBUTES,
1391 CREATE_NOT_DIR, &netfid, &oplock,
737b758c
SF		 1392 NULL, cifs_sb->local_nls,
1393 cifs_sb->mnt_cifs_flags &
1394 CIFS_MOUNT_MAP_SPECIAL_CHR);
1da177e4
LT		 1395 if (rc==0) {
1396 rc = CIFSSMBSetFileTimes(xid, pTcon, &time_buf,
1397 netfid);
1398 CIFSSMBClose(xid, pTcon, netfid);
1399 } else {
1400 /* BB For even older servers we could convert time_buf
1401 into old DOS style which uses two second
1402 granularity */
1403
1404 /* rc = CIFSSMBSetTimesLegacy(xid, pTcon, full_path,
1405 &time_buf, cifs_sb->local_nls); */
1406 }
1407 }
e30dcf3a
SF		 1408 /* Even if error on time set, no sense failing the call if
1409 the server would set the time to a reasonable value anyway,
1410 and this check ensures that we are not being called from
1411 sys_utimes in which case we ought to fail the call back to
1412 the user when the server rejects the call */
c14e894b 1413 if((rc) && (attrs->ia_valid &
e30dcf3a
SF		 1414 (ATTR_MODE | ATTR_GID | ATTR_UID | ATTR_SIZE)))
1415 rc = 0;
1da177e4
LT		 1416 }
1417
1418 /* do not need local check to inode_check_ok since the server does
1419 that */
1420 if (!rc)
1421 rc = inode_setattr(direntry->d_inode, attrs);
e30dcf3a 1422cifs_setattr_exit:
1da177e4
LT		 1423 kfree(full_path);
1424 FreeXid(xid);
1425 return rc;
1426}
1427
1428void cifs_delete_inode(struct inode *inode)
1429{
26a21b98 1430 cFYI(1, ("In cifs_delete_inode, inode = 0x%p", inode));
1da177e4
LT		 1431 /* may have to add back in if and when safe distributed caching of
1432 directories added e.g. via FindNotify */
1433}
kernel source for telekom puls (alcatel/mediatek)