Merge git://git.kernel.org/pub/scm/linux/kernel/git/sfrench/cifs-2.6
[sfrench/cifs-2.6.git] / fs / cifs / inode.c
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/stat.h>
23 #include <linux/pagemap.h>
24 #include <asm/div64.h>
25 #include "cifsfs.h"
26 #include "cifspdu.h"
27 #include "cifsglob.h"
28 #include "cifsproto.h"
29 #include "cifs_debug.h"
30 #include "cifs_fs_sb.h"
31
32 int 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;
43         cFYI(1, ("Getting info on %s", search_path));
44         /* could have done a find first instead but this returns more info */
45         rc = CIFSSMBUnixQPathInfo(xid, pTcon, search_path, &findData,
46                                   cifs_sb->local_nls, cifs_sb->mnt_cifs_flags &
47                                         CIFS_MOUNT_MAP_SPECIAL_CHR);
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,
66                                                  cifs_sb->local_nls, 
67                                                  cifs_sb->mnt_cifs_flags & 
68                                                     CIFS_MOUNT_MAP_SPECIAL_CHR);
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);
84                         if (*pinode == NULL) 
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? */
89                         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM) {
90                                 (*pinode)->i_ino =
91                                         (unsigned long)findData.UniqueId;
92                         } /* note ino incremented to unique num in new_inode */
93                         insert_inode_hash(*pinode);
94                 }
95
96                 inode = *pinode;
97                 cifsInfo = CIFS_I(inode);
98
99                 cFYI(1, ("Old time %ld", cifsInfo->time));
100                 cifsInfo->time = jiffies;
101                 cFYI(1, ("New time %ld", cifsInfo->time));
102                 /* this is ok to set on every inode revalidate */
103                 atomic_set(&cifsInfo->inUse,1);
104
105                 inode->i_atime =
106                     cifs_NTtimeToUnix(le64_to_cpu(findData.LastAccessTime));
107                 inode->i_mtime =
108                     cifs_NTtimeToUnix(le64_to_cpu
109                                 (findData.LastModificationTime));
110                 inode->i_ctime =
111                     cifs_NTtimeToUnix(le64_to_cpu(findData.LastStatusChange));
112                 inode->i_mode = le64_to_cpu(findData.Permissions);
113                 /* since we set the inode type below we need to mask off
114                    to avoid strange results if bits set above */
115                         inode->i_mode &= ~S_IFMT;
116                 if (type == UNIX_FILE) {
117                         inode->i_mode |= S_IFREG;
118                 } else if (type == UNIX_SYMLINK) {
119                         inode->i_mode |= S_IFLNK;
120                 } else if (type == UNIX_DIR) {
121                         inode->i_mode |= S_IFDIR;
122                 } else if (type == UNIX_CHARDEV) {
123                         inode->i_mode |= S_IFCHR;
124                         inode->i_rdev = MKDEV(le64_to_cpu(findData.DevMajor),
125                                 le64_to_cpu(findData.DevMinor) & MINORMASK);
126                 } else if (type == UNIX_BLOCKDEV) {
127                         inode->i_mode |= S_IFBLK;
128                         inode->i_rdev = MKDEV(le64_to_cpu(findData.DevMajor),
129                                 le64_to_cpu(findData.DevMinor) & MINORMASK);
130                 } else if (type == UNIX_FIFO) {
131                         inode->i_mode |= S_IFIFO;
132                 } else if (type == UNIX_SOCKET) {
133                         inode->i_mode |= S_IFSOCK;
134                 } else {
135                         /* safest to call it a file if we do not know */
136                         inode->i_mode |= S_IFREG;
137                         cFYI(1,("unknown type %d",type));
138                 }
139                 inode->i_uid = le64_to_cpu(findData.Uid);
140                 inode->i_gid = le64_to_cpu(findData.Gid);
141                 inode->i_nlink = le64_to_cpu(findData.Nlinks);
142
143                 if (is_size_safe_to_change(cifsInfo)) {
144                 /* can not safely change the file size here if the
145                    client is writing to it due to potential races */
146
147                         i_size_write(inode, end_of_file);
148
149                 /* blksize needs to be multiple of two. So safer to default to
150                 blksize and blkbits set in superblock so 2**blkbits and blksize
151                 will match rather than setting to:
152                 (pTcon->ses->server->maxBuf - MAX_CIFS_HDR_SIZE) & 0xFFFFFE00;*/
153
154                 /* This seems incredibly stupid but it turns out that i_blocks
155                    is not related to (i_size / i_blksize), instead 512 byte size
156                    is required for calculating num blocks */
157
158                 /* 512 bytes (2**9) is the fake blocksize that must be used */
159                 /* for this calculation */
160                         inode->i_blocks = (512 - 1 + num_of_bytes) >> 9;
161                 }
162
163                 if (num_of_bytes < end_of_file)
164                         cFYI(1, ("allocation size less than end of file"));
165                 cFYI(1, ("Size %ld and blocks %llu",
166                         (unsigned long) inode->i_size,
167                         (unsigned long long)inode->i_blocks));
168                 if (S_ISREG(inode->i_mode)) {
169                         cFYI(1, ("File inode"));
170                         inode->i_op = &cifs_file_inode_ops;
171                         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DIRECT_IO) {
172                                 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_BRL)
173                                         inode->i_fop = 
174                                                 &cifs_file_direct_nobrl_ops;
175                                 else
176                                         inode->i_fop = &cifs_file_direct_ops;
177                         } else if(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_BRL)
178                                 inode->i_fop = &cifs_file_nobrl_ops;
179                         else /* not direct, send byte range locks */ 
180                                 inode->i_fop = &cifs_file_ops;
181
182                         /* check if server can support readpages */
183                         if(pTcon->ses->server->maxBuf < 
184                             PAGE_CACHE_SIZE + MAX_CIFS_HDR_SIZE)
185                                 inode->i_data.a_ops = &cifs_addr_ops_smallbuf;
186                         else
187                                 inode->i_data.a_ops = &cifs_addr_ops;
188                 } else if (S_ISDIR(inode->i_mode)) {
189                         cFYI(1, ("Directory inode"));
190                         inode->i_op = &cifs_dir_inode_ops;
191                         inode->i_fop = &cifs_dir_ops;
192                 } else if (S_ISLNK(inode->i_mode)) {
193                         cFYI(1, ("Symbolic Link inode"));
194                         inode->i_op = &cifs_symlink_inode_ops;
195                 /* tmp_inode->i_fop = */ /* do not need to set to anything */
196                 } else {
197                         cFYI(1, ("Init special inode"));
198                         init_special_inode(inode, inode->i_mode,
199                                            inode->i_rdev);
200                 }
201         }
202         return rc;
203 }
204
205 static 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;
213         char buf[24];
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                 int buf_type = CIFS_NO_BUFFER;
233                         /* Read header */
234                 rc = CIFSSMBRead(xid, pTcon,
235                                  netfid,
236                                  24 /* length */, 0 /* offset */,
237                                  &bytes_read, &pbuf, &buf_type);
238                 if((rc == 0) && (bytes_read >= 8)) {
239                         if(memcmp("IntxBLK", pbuf, 8) == 0) {
240                                 cFYI(1,("Block device"));
241                                 inode->i_mode |= S_IFBLK;
242                                 if(bytes_read == 24) {
243                                         /* we have enough to decode dev num */
244                                         __u64 mjr; /* major */
245                                         __u64 mnr; /* minor */
246                                         mjr = le64_to_cpu(*(__le64 *)(pbuf+8));
247                                         mnr = le64_to_cpu(*(__le64 *)(pbuf+16));
248                                         inode->i_rdev = MKDEV(mjr, mnr);
249                                 }
250                         } else if(memcmp("IntxCHR", pbuf, 8) == 0) {
251                                 cFYI(1,("Char device"));
252                                 inode->i_mode |= S_IFCHR;
253                                 if(bytes_read == 24) {
254                                         /* we have enough to decode dev num */
255                                         __u64 mjr; /* major */
256                                         __u64 mnr; /* minor */
257                                         mjr = le64_to_cpu(*(__le64 *)(pbuf+8));
258                                         mnr = le64_to_cpu(*(__le64 *)(pbuf+16));
259                                         inode->i_rdev = MKDEV(mjr, mnr);
260                                 }
261                         } else if(memcmp("IntxLNK", pbuf, 7) == 0) {
262                                 cFYI(1,("Symlink"));
263                                 inode->i_mode |= S_IFLNK;
264                         } else {
265                                 inode->i_mode |= S_IFREG; /* file? */
266                                 rc = -EOPNOTSUPP; 
267                         }
268                 } else {
269                         inode->i_mode |= S_IFREG; /* then it is a file */
270                         rc = -EOPNOTSUPP; /* or some unknown SFU type */        
271                 }               
272                 CIFSSMBClose(xid, pTcon, netfid);
273         }
274         return rc;
275         
276 }
277
278 #define SFBITS_MASK (S_ISVTX | S_ISGID | S_ISUID)  /* SETFILEBITS valid bits */
279
280 static int get_sfu_uid_mode(struct inode * inode,
281                         const unsigned char *path,
282                         struct cifs_sb_info *cifs_sb, int xid)
283 {
284 #ifdef CONFIG_CIFS_XATTR
285         ssize_t rc;
286         char ea_value[4];
287         __u32 mode;
288
289         rc = CIFSSMBQueryEA(xid, cifs_sb->tcon, path, "SETFILEBITS",
290                         ea_value, 4 /* size of buf */, cifs_sb->local_nls,
291                         cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR);
292         if(rc < 0)
293                 return (int)rc;
294         else if (rc > 3) {
295                 mode = le32_to_cpu(*((__le32 *)ea_value));
296                 inode->i_mode &= ~SFBITS_MASK; 
297                 cFYI(1,("special bits 0%o org mode 0%o", mode, inode->i_mode));
298                 inode->i_mode = (mode &  SFBITS_MASK) | inode->i_mode;
299                 cFYI(1,("special mode bits 0%o", mode));
300                 return 0;
301         } else {
302                 return 0;
303         }
304 #else
305         return -EOPNOTSUPP;
306 #endif
307
308                 
309 }
310
311 int cifs_get_inode_info(struct inode **pinode,
312         const unsigned char *search_path, FILE_ALL_INFO *pfindData,
313         struct super_block *sb, int xid)
314 {
315         int rc = 0;
316         struct cifsTconInfo *pTcon;
317         struct inode *inode;
318         struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
319         char *tmp_path;
320         char *buf = NULL;
321
322         pTcon = cifs_sb->tcon;
323         cFYI(1,("Getting info on %s", search_path));
324
325         if ((pfindData == NULL) && (*pinode != NULL)) {
326                 if (CIFS_I(*pinode)->clientCanCacheRead) {
327                         cFYI(1,("No need to revalidate cached inode sizes"));
328                         return rc;
329                 }
330         }
331
332         /* if file info not passed in then get it from server */
333         if (pfindData == NULL) {
334                 buf = kmalloc(sizeof(FILE_ALL_INFO), GFP_KERNEL);
335                 if (buf == NULL)
336                         return -ENOMEM;
337                 pfindData = (FILE_ALL_INFO *)buf;
338                 /* could do find first instead but this returns more info */
339                 rc = CIFSSMBQPathInfo(xid, pTcon, search_path, pfindData,
340                               0 /* not legacy */,
341                               cifs_sb->local_nls, cifs_sb->mnt_cifs_flags &
342                                 CIFS_MOUNT_MAP_SPECIAL_CHR);
343                 /* BB optimize code so we do not make the above call
344                 when server claims no NT SMB support and the above call
345                 failed at least once - set flag in tcon or mount */
346                 if((rc == -EOPNOTSUPP) || (rc == -EINVAL)) {
347                         rc = SMBQueryInformation(xid, pTcon, search_path,
348                                         pfindData, cifs_sb->local_nls, 
349                                         cifs_sb->mnt_cifs_flags &
350                                           CIFS_MOUNT_MAP_SPECIAL_CHR);
351                 }
352                 
353         }
354         /* dump_mem("\nQPathInfo return data",&findData, sizeof(findData)); */
355         if (rc) {
356                 if (rc == -EREMOTE) {
357                         tmp_path =
358                             kmalloc(strnlen
359                                     (pTcon->treeName,
360                                      MAX_TREE_SIZE + 1) +
361                                     strnlen(search_path, MAX_PATHCONF) + 1,
362                                     GFP_KERNEL);
363                         if (tmp_path == NULL) {
364                                 kfree(buf);
365                                 return -ENOMEM;
366                         }
367
368                         strncpy(tmp_path, pTcon->treeName, MAX_TREE_SIZE);
369                         strncat(tmp_path, search_path, MAX_PATHCONF);
370                         rc = connect_to_dfs_path(xid, pTcon->ses,
371                                                  /* treename + */ tmp_path,
372                                                  cifs_sb->local_nls, 
373                                                  cifs_sb->mnt_cifs_flags & 
374                                                    CIFS_MOUNT_MAP_SPECIAL_CHR);
375                         kfree(tmp_path);
376                         /* BB fix up inode etc. */
377                 } else if (rc) {
378                         kfree(buf);
379                         return rc;
380                 }
381         } else {
382                 struct cifsInodeInfo *cifsInfo;
383                 __u32 attr = le32_to_cpu(pfindData->Attributes);
384
385                 /* get new inode */
386                 if (*pinode == NULL) {
387                         *pinode = new_inode(sb);
388                         if (*pinode == NULL) {
389                                 kfree(buf);
390                                 return -ENOMEM;
391                         }
392                         /* Is an i_ino of zero legal? Can we use that to check
393                            if the server supports returning inode numbers?  Are
394                            there other sanity checks we can use to ensure that
395                            the server is really filling in that field? */
396
397                         /* We can not use the IndexNumber field by default from
398                            Windows or Samba (in ALL_INFO buf) but we can request
399                            it explicitly.  It may not be unique presumably if
400                            the server has multiple devices mounted under one
401                            share */
402
403                         /* There may be higher info levels that work but are
404                            there Windows server or network appliances for which
405                            IndexNumber field is not guaranteed unique? */
406
407                         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM){
408                                 int rc1 = 0;
409                                 __u64 inode_num;
410
411                                 rc1 = CIFSGetSrvInodeNumber(xid, pTcon, 
412                                         search_path, &inode_num, 
413                                         cifs_sb->local_nls,
414                                         cifs_sb->mnt_cifs_flags &
415                                                 CIFS_MOUNT_MAP_SPECIAL_CHR);
416                                 if (rc1) {
417                                         cFYI(1,("GetSrvInodeNum rc %d", rc1));
418                                         /* BB EOPNOSUPP disable SERVER_INUM? */
419                                 } else /* do we need cast or hash to ino? */
420                                         (*pinode)->i_ino = inode_num;
421                         } /* else ino incremented to unique num in new_inode*/
422                         insert_inode_hash(*pinode);
423                 }
424                 inode = *pinode;
425                 cifsInfo = CIFS_I(inode);
426                 cifsInfo->cifsAttrs = attr;
427                 cFYI(1, ("Old time %ld", cifsInfo->time));
428                 cifsInfo->time = jiffies;
429                 cFYI(1, ("New time %ld", cifsInfo->time));
430
431                 /* blksize needs to be multiple of two. So safer to default to
432                 blksize and blkbits set in superblock so 2**blkbits and blksize
433                 will match rather than setting to:
434                 (pTcon->ses->server->maxBuf - MAX_CIFS_HDR_SIZE) & 0xFFFFFE00;*/
435
436                 /* Linux can not store file creation time so ignore it */
437                 if(pfindData->LastAccessTime)
438                         inode->i_atime = cifs_NTtimeToUnix
439                                 (le64_to_cpu(pfindData->LastAccessTime));
440                 else /* do not need to use current_fs_time - time not stored */
441                         inode->i_atime = CURRENT_TIME;
442                 inode->i_mtime =
443                     cifs_NTtimeToUnix(le64_to_cpu(pfindData->LastWriteTime));
444                 inode->i_ctime =
445                     cifs_NTtimeToUnix(le64_to_cpu(pfindData->ChangeTime));
446                 cFYI(0, ("Attributes came in as 0x%x", attr));
447
448                 /* set default mode. will override for dirs below */
449                 if (atomic_read(&cifsInfo->inUse) == 0)
450                         /* new inode, can safely set these fields */
451                         inode->i_mode = cifs_sb->mnt_file_mode;
452                 else /* since we set the inode type below we need to mask off
453                      to avoid strange results if type changes and both get orred in */ 
454                         inode->i_mode &= ~S_IFMT; 
455 /*              if (attr & ATTR_REPARSE)  */
456                 /* We no longer handle these as symlinks because we could not
457                    follow them due to the absolute path with drive letter */
458                 if (attr & ATTR_DIRECTORY) {
459                 /* override default perms since we do not do byte range locking
460                    on dirs */
461                         inode->i_mode = cifs_sb->mnt_dir_mode;
462                         inode->i_mode |= S_IFDIR;
463                 } else if ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_UNX_EMUL) &&
464                            (cifsInfo->cifsAttrs & ATTR_SYSTEM) &&
465                            /* No need to le64 convert size of zero */
466                            (pfindData->EndOfFile == 0)) {
467                         inode->i_mode = cifs_sb->mnt_file_mode;
468                         inode->i_mode |= S_IFIFO;
469 /* BB Finish for SFU style symlinks and devices */
470                 } else if ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_UNX_EMUL) &&
471                            (cifsInfo->cifsAttrs & ATTR_SYSTEM)) {
472                         if (decode_sfu_inode(inode, 
473                                          le64_to_cpu(pfindData->EndOfFile),
474                                          search_path,
475                                          cifs_sb, xid)) {
476                                 cFYI(1,("Unrecognized sfu inode type"));
477                         }
478                         cFYI(1,("sfu mode 0%o",inode->i_mode));
479                 } else {
480                         inode->i_mode |= S_IFREG;
481                         /* treat the dos attribute of read-only as read-only
482                            mode e.g. 555 */
483                         if (cifsInfo->cifsAttrs & ATTR_READONLY)
484                                 inode->i_mode &= ~(S_IWUGO);
485                 /* BB add code here -
486                    validate if device or weird share or device type? */
487                 }
488                 if (is_size_safe_to_change(cifsInfo)) {
489                         /* can not safely change the file size here if the
490                            client is writing to it due to potential races */
491                         i_size_write(inode,le64_to_cpu(pfindData->EndOfFile));
492
493                         /* 512 bytes (2**9) is the fake blocksize that must be
494                            used for this calculation */
495                         inode->i_blocks = (512 - 1 + le64_to_cpu(
496                                            pfindData->AllocationSize)) >> 9;
497                 }
498
499                 inode->i_nlink = le32_to_cpu(pfindData->NumberOfLinks);
500
501                 /* BB fill in uid and gid here? with help from winbind? 
502                    or retrieve from NTFS stream extended attribute */
503                 if(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_UNX_EMUL) {
504                         /* fill in uid, gid, mode from server ACL */
505                         get_sfu_uid_mode(inode, search_path, cifs_sb, xid);
506                 } else if (atomic_read(&cifsInfo->inUse) == 0) {
507                         inode->i_uid = cifs_sb->mnt_uid;
508                         inode->i_gid = cifs_sb->mnt_gid;
509                         /* set so we do not keep refreshing these fields with
510                            bad data after user has changed them in memory */
511                         atomic_set(&cifsInfo->inUse,1);
512                 }
513
514                 if (S_ISREG(inode->i_mode)) {
515                         cFYI(1, ("File inode"));
516                         inode->i_op = &cifs_file_inode_ops;
517                         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DIRECT_IO) {
518                                 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_BRL)
519                                         inode->i_fop =
520                                                 &cifs_file_direct_nobrl_ops;
521                                 else
522                                         inode->i_fop = &cifs_file_direct_ops;
523                         } else if(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_BRL)
524                                 inode->i_fop = &cifs_file_nobrl_ops;
525                         else /* not direct, send byte range locks */
526                                 inode->i_fop = &cifs_file_ops;
527
528                         if(pTcon->ses->server->maxBuf < 
529                              PAGE_CACHE_SIZE + MAX_CIFS_HDR_SIZE)
530                                 inode->i_data.a_ops = &cifs_addr_ops_smallbuf;
531                         else
532                                 inode->i_data.a_ops = &cifs_addr_ops;
533                 } else if (S_ISDIR(inode->i_mode)) {
534                         cFYI(1, ("Directory inode"));
535                         inode->i_op = &cifs_dir_inode_ops;
536                         inode->i_fop = &cifs_dir_ops;
537                 } else if (S_ISLNK(inode->i_mode)) {
538                         cFYI(1, ("Symbolic Link inode"));
539                         inode->i_op = &cifs_symlink_inode_ops;
540                 } else {
541                         init_special_inode(inode, inode->i_mode,
542                                            inode->i_rdev);
543                 }
544         }
545         kfree(buf);
546         return rc;
547 }
548
549 /* gets root inode */
550 void cifs_read_inode(struct inode *inode)
551 {
552         int xid;
553         struct cifs_sb_info *cifs_sb;
554
555         cifs_sb = CIFS_SB(inode->i_sb);
556         xid = GetXid();
557         if (cifs_sb->tcon->ses->capabilities & CAP_UNIX)
558                 cifs_get_inode_info_unix(&inode, "", inode->i_sb,xid);
559         else
560                 cifs_get_inode_info(&inode, "", NULL, inode->i_sb,xid);
561         /* can not call macro FreeXid here since in a void func */
562         _FreeXid(xid);
563 }
564
565 int cifs_unlink(struct inode *inode, struct dentry *direntry)
566 {
567         int rc = 0;
568         int xid;
569         struct cifs_sb_info *cifs_sb;
570         struct cifsTconInfo *pTcon;
571         char *full_path = NULL;
572         struct cifsInodeInfo *cifsInode;
573         FILE_BASIC_INFO *pinfo_buf;
574
575         cFYI(1, ("cifs_unlink, inode = 0x%p", inode));
576
577         xid = GetXid();
578
579         if(inode)
580                 cifs_sb = CIFS_SB(inode->i_sb);
581         else
582                 cifs_sb = CIFS_SB(direntry->d_sb);
583         pTcon = cifs_sb->tcon;
584
585         /* Unlink can be called from rename so we can not grab the sem here
586            since we deadlock otherwise */
587 /*      mutex_lock(&direntry->d_sb->s_vfs_rename_mutex);*/
588         full_path = build_path_from_dentry(direntry);
589 /*      mutex_unlock(&direntry->d_sb->s_vfs_rename_mutex);*/
590         if (full_path == NULL) {
591                 FreeXid(xid);
592                 return -ENOMEM;
593         }
594         rc = CIFSSMBDelFile(xid, pTcon, full_path, cifs_sb->local_nls,
595                         cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR);
596
597         if (!rc) {
598                 if (direntry->d_inode)
599                         drop_nlink(direntry->d_inode);
600         } else if (rc == -ENOENT) {
601                 d_drop(direntry);
602         } else if (rc == -ETXTBSY) {
603                 int oplock = FALSE;
604                 __u16 netfid;
605
606                 rc = CIFSSMBOpen(xid, pTcon, full_path, FILE_OPEN, DELETE,
607                                  CREATE_NOT_DIR | CREATE_DELETE_ON_CLOSE,
608                                  &netfid, &oplock, NULL, cifs_sb->local_nls,
609                                  cifs_sb->mnt_cifs_flags & 
610                                         CIFS_MOUNT_MAP_SPECIAL_CHR);
611                 if (rc==0) {
612                         CIFSSMBRenameOpenFile(xid, pTcon, netfid, NULL,
613                                               cifs_sb->local_nls, 
614                                               cifs_sb->mnt_cifs_flags & 
615                                                 CIFS_MOUNT_MAP_SPECIAL_CHR);
616                         CIFSSMBClose(xid, pTcon, netfid);
617                         if (direntry->d_inode)
618                                 drop_nlink(direntry->d_inode);
619                 }
620         } else if (rc == -EACCES) {
621                 /* try only if r/o attribute set in local lookup data? */
622                 pinfo_buf = kzalloc(sizeof(FILE_BASIC_INFO), GFP_KERNEL);
623                 if (pinfo_buf) {
624                         /* ATTRS set to normal clears r/o bit */
625                         pinfo_buf->Attributes = cpu_to_le32(ATTR_NORMAL);
626                         if (!(pTcon->ses->flags & CIFS_SES_NT4))
627                                 rc = CIFSSMBSetTimes(xid, pTcon, full_path,
628                                                      pinfo_buf,
629                                                      cifs_sb->local_nls,
630                                                      cifs_sb->mnt_cifs_flags & 
631                                                         CIFS_MOUNT_MAP_SPECIAL_CHR);
632                         else
633                                 rc = -EOPNOTSUPP;
634
635                         if (rc == -EOPNOTSUPP) {
636                                 int oplock = FALSE;
637                                 __u16 netfid;
638                         /*      rc = CIFSSMBSetAttrLegacy(xid, pTcon,
639                                                           full_path,
640                                                           (__u16)ATTR_NORMAL,
641                                                           cifs_sb->local_nls); 
642                            For some strange reason it seems that NT4 eats the
643                            old setattr call without actually setting the
644                            attributes so on to the third attempted workaround
645                            */
646
647                         /* BB could scan to see if we already have it open
648                            and pass in pid of opener to function */
649                                 rc = CIFSSMBOpen(xid, pTcon, full_path,
650                                                  FILE_OPEN, SYNCHRONIZE |
651                                                  FILE_WRITE_ATTRIBUTES, 0,
652                                                  &netfid, &oplock, NULL,
653                                                  cifs_sb->local_nls,
654                                                  cifs_sb->mnt_cifs_flags & 
655                                                     CIFS_MOUNT_MAP_SPECIAL_CHR);
656                                 if (rc==0) {
657                                         rc = CIFSSMBSetFileTimes(xid, pTcon,
658                                                                  pinfo_buf,
659                                                                  netfid);
660                                         CIFSSMBClose(xid, pTcon, netfid);
661                                 }
662                         }
663                         kfree(pinfo_buf);
664                 }
665                 if (rc==0) {
666                         rc = CIFSSMBDelFile(xid, pTcon, full_path, 
667                                             cifs_sb->local_nls, 
668                                             cifs_sb->mnt_cifs_flags & 
669                                                 CIFS_MOUNT_MAP_SPECIAL_CHR);
670                         if (!rc) {
671                                 if (direntry->d_inode)
672                                         drop_nlink(direntry->d_inode);
673                         } else if (rc == -ETXTBSY) {
674                                 int oplock = FALSE;
675                                 __u16 netfid;
676
677                                 rc = CIFSSMBOpen(xid, pTcon, full_path,
678                                                  FILE_OPEN, DELETE,
679                                                  CREATE_NOT_DIR |
680                                                  CREATE_DELETE_ON_CLOSE,
681                                                  &netfid, &oplock, NULL,
682                                                  cifs_sb->local_nls, 
683                                                  cifs_sb->mnt_cifs_flags & 
684                                                     CIFS_MOUNT_MAP_SPECIAL_CHR);
685                                 if (rc==0) {
686                                         CIFSSMBRenameOpenFile(xid, pTcon,
687                                                 netfid, NULL,
688                                                 cifs_sb->local_nls,
689                                                 cifs_sb->mnt_cifs_flags &
690                                                     CIFS_MOUNT_MAP_SPECIAL_CHR);
691                                         CIFSSMBClose(xid, pTcon, netfid);
692                                         if (direntry->d_inode)
693                                                 drop_nlink(direntry->d_inode);
694                                 }
695                         /* BB if rc = -ETXTBUSY goto the rename logic BB */
696                         }
697                 }
698         }
699         if (direntry->d_inode) {
700                 cifsInode = CIFS_I(direntry->d_inode);
701                 cifsInode->time = 0;    /* will force revalidate to get info
702                                            when needed */
703                 direntry->d_inode->i_ctime = current_fs_time(inode->i_sb);
704         }
705         if(inode) {
706                 inode->i_ctime = inode->i_mtime = current_fs_time(inode->i_sb);
707                 cifsInode = CIFS_I(inode);
708                 cifsInode->time = 0;    /* force revalidate of dir as well */
709         }
710
711         kfree(full_path);
712         FreeXid(xid);
713         return rc;
714 }
715
716 int cifs_mkdir(struct inode *inode, struct dentry *direntry, int mode)
717 {
718         int rc = 0;
719         int xid;
720         struct cifs_sb_info *cifs_sb;
721         struct cifsTconInfo *pTcon;
722         char *full_path = NULL;
723         struct inode *newinode = NULL;
724
725         cFYI(1, ("In cifs_mkdir, mode = 0x%x inode = 0x%p", mode, inode));
726
727         xid = GetXid();
728
729         cifs_sb = CIFS_SB(inode->i_sb);
730         pTcon = cifs_sb->tcon;
731
732         full_path = build_path_from_dentry(direntry);
733         if (full_path == NULL) {
734                 FreeXid(xid);
735                 return -ENOMEM;
736         }
737         /* BB add setting the equivalent of mode via CreateX w/ACLs */
738         rc = CIFSSMBMkDir(xid, pTcon, full_path, cifs_sb->local_nls,
739                           cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR);
740         if (rc) {
741                 cFYI(1, ("cifs_mkdir returned 0x%x", rc));
742                 d_drop(direntry);
743         } else {
744                 inc_nlink(inode);
745                 if (pTcon->ses->capabilities & CAP_UNIX)
746                         rc = cifs_get_inode_info_unix(&newinode, full_path,
747                                                       inode->i_sb,xid);
748                 else
749                         rc = cifs_get_inode_info(&newinode, full_path, NULL,
750                                                  inode->i_sb,xid);
751
752                 if (pTcon->nocase)
753                         direntry->d_op = &cifs_ci_dentry_ops;
754                 else
755                         direntry->d_op = &cifs_dentry_ops;
756                 d_instantiate(direntry, newinode);
757                 if (direntry->d_inode)
758                         direntry->d_inode->i_nlink = 2;
759                 if (cifs_sb->tcon->ses->capabilities & CAP_UNIX)
760                         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SET_UID) {
761                                 CIFSSMBUnixSetPerms(xid, pTcon, full_path,
762                                                     mode,
763                                                     (__u64)current->fsuid,
764                                                     (__u64)current->fsgid,
765                                                     0 /* dev_t */,
766                                                     cifs_sb->local_nls,
767                                                     cifs_sb->mnt_cifs_flags &
768                                                     CIFS_MOUNT_MAP_SPECIAL_CHR);
769                         } else {
770                                 CIFSSMBUnixSetPerms(xid, pTcon, full_path,
771                                                     mode, (__u64)-1,
772                                                     (__u64)-1, 0 /* dev_t */,
773                                                     cifs_sb->local_nls,
774                                                     cifs_sb->mnt_cifs_flags & 
775                                                     CIFS_MOUNT_MAP_SPECIAL_CHR);
776                         }
777                 else {
778                         /* BB to be implemented via Windows secrty descriptors
779                            eg CIFSSMBWinSetPerms(xid, pTcon, full_path, mode,
780                                                  -1, -1, local_nls); */
781                         if(direntry->d_inode) {
782                                 direntry->d_inode->i_mode = mode;
783                                 direntry->d_inode->i_mode |= S_IFDIR;
784                                 if(cifs_sb->mnt_cifs_flags & 
785                                      CIFS_MOUNT_SET_UID) {
786                                         direntry->d_inode->i_uid = 
787                                                 current->fsuid;
788                                         direntry->d_inode->i_gid = 
789                                                 current->fsgid;
790                                 }
791                         }
792                 }
793         }
794         kfree(full_path);
795         FreeXid(xid);
796         return rc;
797 }
798
799 int cifs_rmdir(struct inode *inode, struct dentry *direntry)
800 {
801         int rc = 0;
802         int xid;
803         struct cifs_sb_info *cifs_sb;
804         struct cifsTconInfo *pTcon;
805         char *full_path = NULL;
806         struct cifsInodeInfo *cifsInode;
807
808         cFYI(1, ("cifs_rmdir, inode = 0x%p", inode));
809
810         xid = GetXid();
811
812         cifs_sb = CIFS_SB(inode->i_sb);
813         pTcon = cifs_sb->tcon;
814
815         full_path = build_path_from_dentry(direntry);
816         if (full_path == NULL) {
817                 FreeXid(xid);
818                 return -ENOMEM;
819         }
820
821         rc = CIFSSMBRmDir(xid, pTcon, full_path, cifs_sb->local_nls,
822                           cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR);
823
824         if (!rc) {
825                 drop_nlink(inode);
826                 i_size_write(direntry->d_inode,0);
827                 clear_nlink(direntry->d_inode);
828         }
829
830         cifsInode = CIFS_I(direntry->d_inode);
831         cifsInode->time = 0;    /* force revalidate to go get info when
832                                    needed */
833         direntry->d_inode->i_ctime = inode->i_ctime = inode->i_mtime =
834                 current_fs_time(inode->i_sb);
835
836         kfree(full_path);
837         FreeXid(xid);
838         return rc;
839 }
840
841 int cifs_rename(struct inode *source_inode, struct dentry *source_direntry,
842         struct inode *target_inode, struct dentry *target_direntry)
843 {
844         char *fromName;
845         char *toName;
846         struct cifs_sb_info *cifs_sb_source;
847         struct cifs_sb_info *cifs_sb_target;
848         struct cifsTconInfo *pTcon;
849         int xid;
850         int rc = 0;
851
852         xid = GetXid();
853
854         cifs_sb_target = CIFS_SB(target_inode->i_sb);
855         cifs_sb_source = CIFS_SB(source_inode->i_sb);
856         pTcon = cifs_sb_source->tcon;
857
858         if (pTcon != cifs_sb_target->tcon) {
859                 FreeXid(xid);
860                 return -EXDEV;  /* BB actually could be allowed if same server,
861                                    but different share.
862                                    Might eventually add support for this */
863         }
864
865         /* we already  have the rename sem so we do not need to grab it again
866            here to protect the path integrity */
867         fromName = build_path_from_dentry(source_direntry);
868         toName = build_path_from_dentry(target_direntry);
869         if ((fromName == NULL) || (toName == NULL)) {
870                 rc = -ENOMEM;
871                 goto cifs_rename_exit;
872         }
873
874         rc = CIFSSMBRename(xid, pTcon, fromName, toName,
875                            cifs_sb_source->local_nls,
876                            cifs_sb_source->mnt_cifs_flags &
877                                 CIFS_MOUNT_MAP_SPECIAL_CHR);
878         if (rc == -EEXIST) {
879                 /* check if they are the same file because rename of hardlinked
880                    files is a noop */
881                 FILE_UNIX_BASIC_INFO *info_buf_source;
882                 FILE_UNIX_BASIC_INFO *info_buf_target;
883
884                 info_buf_source =
885                         kmalloc(2 * sizeof(FILE_UNIX_BASIC_INFO), GFP_KERNEL);
886                 if (info_buf_source != NULL) {
887                         info_buf_target = info_buf_source + 1;
888                         rc = CIFSSMBUnixQPathInfo(xid, pTcon, fromName,
889                                 info_buf_source, cifs_sb_source->local_nls, 
890                                 cifs_sb_source->mnt_cifs_flags &
891                                         CIFS_MOUNT_MAP_SPECIAL_CHR);
892                         if (rc == 0) {
893                                 rc = CIFSSMBUnixQPathInfo(xid, pTcon, toName,
894                                                 info_buf_target,
895                                                 cifs_sb_target->local_nls,
896                                                 /* remap based on source sb */
897                                                 cifs_sb_source->mnt_cifs_flags &
898                                                     CIFS_MOUNT_MAP_SPECIAL_CHR);
899                         }
900                         if ((rc == 0) &&
901                             (info_buf_source->UniqueId ==
902                              info_buf_target->UniqueId)) {
903                         /* do not rename since the files are hardlinked which
904                            is a noop */
905                         } else {
906                         /* we either can not tell the files are hardlinked
907                            (as with Windows servers) or files are not
908                            hardlinked so delete the target manually before
909                            renaming to follow POSIX rather than Windows
910                            semantics */
911                                 cifs_unlink(target_inode, target_direntry);
912                                 rc = CIFSSMBRename(xid, pTcon, fromName,
913                                                    toName,
914                                                    cifs_sb_source->local_nls,
915                                                    cifs_sb_source->mnt_cifs_flags
916                                                    & CIFS_MOUNT_MAP_SPECIAL_CHR);
917                         }
918                         kfree(info_buf_source);
919                 } /* if we can not get memory just leave rc as EEXIST */
920         }
921
922         if (rc) {
923                 cFYI(1, ("rename rc %d", rc));
924         }
925
926         if ((rc == -EIO) || (rc == -EEXIST)) {
927                 int oplock = FALSE;
928                 __u16 netfid;
929
930                 /* BB FIXME Is Generic Read correct for rename? */
931                 /* if renaming directory - we should not say CREATE_NOT_DIR,
932                    need to test renaming open directory, also GENERIC_READ
933                    might not right be right access to request */
934                 rc = CIFSSMBOpen(xid, pTcon, fromName, FILE_OPEN, GENERIC_READ,
935                                  CREATE_NOT_DIR, &netfid, &oplock, NULL,
936                                  cifs_sb_source->local_nls, 
937                                  cifs_sb_source->mnt_cifs_flags & 
938                                         CIFS_MOUNT_MAP_SPECIAL_CHR);
939                 if (rc==0) {
940                         CIFSSMBRenameOpenFile(xid, pTcon, netfid, toName,
941                                               cifs_sb_source->local_nls, 
942                                               cifs_sb_source->mnt_cifs_flags &
943                                                 CIFS_MOUNT_MAP_SPECIAL_CHR);
944                         CIFSSMBClose(xid, pTcon, netfid);
945                 }
946         }
947
948 cifs_rename_exit:
949         kfree(fromName);
950         kfree(toName);
951         FreeXid(xid);
952         return rc;
953 }
954
955 int cifs_revalidate(struct dentry *direntry)
956 {
957         int xid;
958         int rc = 0;
959         char *full_path;
960         struct cifs_sb_info *cifs_sb;
961         struct cifsInodeInfo *cifsInode;
962         loff_t local_size;
963         struct timespec local_mtime;
964         int invalidate_inode = FALSE;
965
966         if (direntry->d_inode == NULL)
967                 return -ENOENT;
968
969         cifsInode = CIFS_I(direntry->d_inode);
970
971         if (cifsInode == NULL)
972                 return -ENOENT;
973
974         /* no sense revalidating inode info on file that no one can write */
975         if (CIFS_I(direntry->d_inode)->clientCanCacheRead)
976                 return rc;
977
978         xid = GetXid();
979
980         cifs_sb = CIFS_SB(direntry->d_sb);
981
982         /* can not safely grab the rename sem here if rename calls revalidate
983            since that would deadlock */
984         full_path = build_path_from_dentry(direntry);
985         if (full_path == NULL) {
986                 FreeXid(xid);
987                 return -ENOMEM;
988         }
989         cFYI(1, ("Revalidate: %s inode 0x%p count %d dentry: 0x%p d_time %ld "
990                  "jiffies %ld", full_path, direntry->d_inode,
991                  direntry->d_inode->i_count.counter, direntry,
992                  direntry->d_time, jiffies));
993
994         if (cifsInode->time == 0) {
995                 /* was set to zero previously to force revalidate */
996         } else if (time_before(jiffies, cifsInode->time + HZ) &&
997                    lookupCacheEnabled) {
998                 if ((S_ISREG(direntry->d_inode->i_mode) == 0) ||
999                     (direntry->d_inode->i_nlink == 1)) {
1000                         kfree(full_path);
1001                         FreeXid(xid);
1002                         return rc;
1003                 } else {
1004                         cFYI(1, ("Have to revalidate file due to hardlinks"));
1005                 }
1006         }
1007
1008         /* save mtime and size */
1009         local_mtime = direntry->d_inode->i_mtime;
1010         local_size = direntry->d_inode->i_size;
1011
1012         if (cifs_sb->tcon->ses->capabilities & CAP_UNIX) {
1013                 rc = cifs_get_inode_info_unix(&direntry->d_inode, full_path,
1014                                               direntry->d_sb,xid);
1015                 if (rc) {
1016                         cFYI(1, ("error on getting revalidate info %d", rc));
1017 /*                      if (rc != -ENOENT)
1018                                 rc = 0; */      /* BB should we cache info on
1019                                                    certain errors? */
1020                 }
1021         } else {
1022                 rc = cifs_get_inode_info(&direntry->d_inode, full_path, NULL,
1023                                          direntry->d_sb,xid);
1024                 if (rc) {
1025                         cFYI(1, ("error on getting revalidate info %d", rc));
1026 /*                      if (rc != -ENOENT)
1027                                 rc = 0; */      /* BB should we cache info on
1028                                                    certain errors? */
1029                 }
1030         }
1031         /* should we remap certain errors, access denied?, to zero */
1032
1033         /* if not oplocked, we invalidate inode pages if mtime or file size
1034            had changed on server */
1035
1036         if (timespec_equal(&local_mtime,&direntry->d_inode->i_mtime) && 
1037             (local_size == direntry->d_inode->i_size)) {
1038                 cFYI(1, ("cifs_revalidate - inode unchanged"));
1039         } else {
1040                 /* file may have changed on server */
1041                 if (cifsInode->clientCanCacheRead) {
1042                         /* no need to invalidate inode pages since we were the
1043                            only ones who could have modified the file and the
1044                            server copy is staler than ours */
1045                 } else {
1046                         invalidate_inode = TRUE;
1047                 }
1048         }
1049
1050         /* can not grab this sem since kernel filesys locking documentation
1051            indicates i_mutex may be taken by the kernel on lookup and rename
1052            which could deadlock if we grab the i_mutex here as well */
1053 /*      mutex_lock(&direntry->d_inode->i_mutex);*/
1054         /* need to write out dirty pages here  */
1055         if (direntry->d_inode->i_mapping) {
1056                 /* do we need to lock inode until after invalidate completes
1057                    below? */
1058                 filemap_fdatawrite(direntry->d_inode->i_mapping);
1059         }
1060         if (invalidate_inode) {
1061         /* shrink_dcache not necessary now that cifs dentry ops
1062         are exported for negative dentries */
1063 /*              if(S_ISDIR(direntry->d_inode->i_mode)) 
1064                         shrink_dcache_parent(direntry); */
1065                 if (S_ISREG(direntry->d_inode->i_mode)) {
1066                         if (direntry->d_inode->i_mapping)
1067                                 filemap_fdatawait(direntry->d_inode->i_mapping);
1068                         /* may eventually have to do this for open files too */
1069                         if (list_empty(&(cifsInode->openFileList))) {
1070                                 /* changed on server - flush read ahead pages */
1071                                 cFYI(1, ("Invalidating read ahead data on "
1072                                          "closed file"));
1073                                 invalidate_remote_inode(direntry->d_inode);
1074                         }
1075                 }
1076         }
1077 /*      mutex_unlock(&direntry->d_inode->i_mutex); */
1078         
1079         kfree(full_path);
1080         FreeXid(xid);
1081         return rc;
1082 }
1083
1084 int cifs_getattr(struct vfsmount *mnt, struct dentry *dentry,
1085         struct kstat *stat)
1086 {
1087         int err = cifs_revalidate(dentry);
1088         if (!err)
1089                 generic_fillattr(dentry->d_inode, stat);
1090         return err;
1091 }
1092
1093 static int cifs_truncate_page(struct address_space *mapping, loff_t from)
1094 {
1095         pgoff_t index = from >> PAGE_CACHE_SHIFT;
1096         unsigned offset = from & (PAGE_CACHE_SIZE - 1);
1097         struct page *page;
1098         char *kaddr;
1099         int rc = 0;
1100
1101         page = grab_cache_page(mapping, index);
1102         if (!page)
1103                 return -ENOMEM;
1104
1105         kaddr = kmap_atomic(page, KM_USER0);
1106         memset(kaddr + offset, 0, PAGE_CACHE_SIZE - offset);
1107         flush_dcache_page(page);
1108         kunmap_atomic(kaddr, KM_USER0);
1109         unlock_page(page);
1110         page_cache_release(page);
1111         return rc;
1112 }
1113
1114 int cifs_setattr(struct dentry *direntry, struct iattr *attrs)
1115 {
1116         int xid;
1117         struct cifs_sb_info *cifs_sb;
1118         struct cifsTconInfo *pTcon;
1119         char *full_path = NULL;
1120         int rc = -EACCES;
1121         struct cifsFileInfo *open_file = NULL;
1122         FILE_BASIC_INFO time_buf;
1123         int set_time = FALSE;
1124         __u64 mode = 0xFFFFFFFFFFFFFFFFULL;
1125         __u64 uid = 0xFFFFFFFFFFFFFFFFULL;
1126         __u64 gid = 0xFFFFFFFFFFFFFFFFULL;
1127         struct cifsInodeInfo *cifsInode;
1128
1129         xid = GetXid();
1130
1131         cFYI(1, ("setattr on file %s attrs->iavalid 0x%x",
1132                  direntry->d_name.name, attrs->ia_valid));
1133
1134         cifs_sb = CIFS_SB(direntry->d_inode->i_sb);
1135         pTcon = cifs_sb->tcon;
1136
1137         if ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_PERM) == 0) {
1138                 /* check if we have permission to change attrs */
1139                 rc = inode_change_ok(direntry->d_inode, attrs);
1140                 if(rc < 0) {
1141                         FreeXid(xid);
1142                         return rc;
1143                 } else
1144                         rc = 0;
1145         }
1146                 
1147         full_path = build_path_from_dentry(direntry);
1148         if (full_path == NULL) {
1149                 FreeXid(xid);
1150                 return -ENOMEM;
1151         }
1152         cifsInode = CIFS_I(direntry->d_inode);
1153
1154         /* BB check if we need to refresh inode from server now ? BB */
1155
1156         /* need to flush data before changing file size on server */
1157         filemap_write_and_wait(direntry->d_inode->i_mapping);
1158
1159         if (attrs->ia_valid & ATTR_SIZE) {
1160                 /* To avoid spurious oplock breaks from server, in the case of
1161                    inodes that we already have open, avoid doing path based
1162                    setting of file size if we can do it by handle.
1163                    This keeps our caching token (oplock) and avoids timeouts
1164                    when the local oplock break takes longer to flush
1165                    writebehind data than the SMB timeout for the SetPathInfo
1166                    request would allow */
1167
1168                 open_file = find_writable_file(cifsInode);
1169                 if (open_file) {
1170                         __u16 nfid = open_file->netfid;
1171                         __u32 npid = open_file->pid;
1172                         rc = CIFSSMBSetFileSize(xid, pTcon, attrs->ia_size,
1173                                                 nfid, npid, FALSE);
1174                         atomic_dec(&open_file->wrtPending);
1175                         cFYI(1,("SetFSize for attrs rc = %d", rc));
1176                         if((rc == -EINVAL) || (rc == -EOPNOTSUPP)) {
1177                                 int bytes_written;
1178                                 rc = CIFSSMBWrite(xid, pTcon,
1179                                                   nfid, 0, attrs->ia_size,
1180                                                   &bytes_written, NULL, NULL,
1181                                                   1 /* 45 seconds */);
1182                                 cFYI(1,("Wrt seteof rc %d", rc));
1183                         }
1184                 } else 
1185                         rc = -EINVAL;
1186
1187                 if (rc != 0) {
1188                         /* Set file size by pathname rather than by handle
1189                            either because no valid, writeable file handle for
1190                            it was found or because there was an error setting
1191                            it by handle */
1192                         rc = CIFSSMBSetEOF(xid, pTcon, full_path,
1193                                            attrs->ia_size, FALSE,
1194                                            cifs_sb->local_nls, 
1195                                            cifs_sb->mnt_cifs_flags &
1196                                                 CIFS_MOUNT_MAP_SPECIAL_CHR);
1197                         cFYI(1, ("SetEOF by path (setattrs) rc = %d", rc));
1198                         if((rc == -EINVAL) || (rc == -EOPNOTSUPP)) {
1199                                 __u16 netfid;
1200                                 int oplock = FALSE;
1201
1202                                 rc = SMBLegacyOpen(xid, pTcon, full_path,
1203                                         FILE_OPEN,
1204                                         SYNCHRONIZE | FILE_WRITE_ATTRIBUTES,
1205                                         CREATE_NOT_DIR, &netfid, &oplock,
1206                                         NULL, cifs_sb->local_nls,
1207                                         cifs_sb->mnt_cifs_flags &
1208                                                 CIFS_MOUNT_MAP_SPECIAL_CHR);
1209                                 if (rc==0) {
1210                                         int bytes_written;
1211                                         rc = CIFSSMBWrite(xid, pTcon,
1212                                                         netfid, 0,
1213                                                         attrs->ia_size,
1214                                                         &bytes_written, NULL,
1215                                                         NULL, 1 /* 45 sec */);
1216                                         cFYI(1,("wrt seteof rc %d",rc));
1217                                         CIFSSMBClose(xid, pTcon, netfid);
1218                                 }
1219
1220                         }
1221                 }
1222
1223                 /* Server is ok setting allocation size implicitly - no need
1224                    to call:
1225                 CIFSSMBSetEOF(xid, pTcon, full_path, attrs->ia_size, TRUE,
1226                          cifs_sb->local_nls);
1227                    */
1228
1229                 if (rc == 0) {
1230                         rc = vmtruncate(direntry->d_inode, attrs->ia_size);
1231                         cifs_truncate_page(direntry->d_inode->i_mapping,
1232                                            direntry->d_inode->i_size);
1233                 } else 
1234                         goto cifs_setattr_exit;
1235         }
1236         if (attrs->ia_valid & ATTR_UID) {
1237                 cFYI(1, ("UID changed to %d", attrs->ia_uid));
1238                 uid = attrs->ia_uid;
1239         }
1240         if (attrs->ia_valid & ATTR_GID) {
1241                 cFYI(1, ("GID changed to %d", attrs->ia_gid));
1242                 gid = attrs->ia_gid;
1243         }
1244
1245         time_buf.Attributes = 0;
1246         if (attrs->ia_valid & ATTR_MODE) {
1247                 cFYI(1, ("Mode changed to 0x%x", attrs->ia_mode));
1248                 mode = attrs->ia_mode;
1249         }
1250
1251         if ((cifs_sb->tcon->ses->capabilities & CAP_UNIX)
1252             && (attrs->ia_valid & (ATTR_MODE | ATTR_GID | ATTR_UID)))
1253                 rc = CIFSSMBUnixSetPerms(xid, pTcon, full_path, mode, uid, gid,
1254                                          0 /* dev_t */, cifs_sb->local_nls,
1255                                          cifs_sb->mnt_cifs_flags & 
1256                                                 CIFS_MOUNT_MAP_SPECIAL_CHR);
1257         else if (attrs->ia_valid & ATTR_MODE) {
1258                 rc = 0;
1259                 if ((mode & S_IWUGO) == 0) /* not writeable */ {
1260                         if ((cifsInode->cifsAttrs & ATTR_READONLY) == 0)
1261                                 time_buf.Attributes =
1262                                         cpu_to_le32(cifsInode->cifsAttrs |
1263                                                     ATTR_READONLY);
1264                 } else if ((mode & S_IWUGO) == S_IWUGO) {
1265                         if (cifsInode->cifsAttrs & ATTR_READONLY)
1266                                 time_buf.Attributes =
1267                                         cpu_to_le32(cifsInode->cifsAttrs &
1268                                                     (~ATTR_READONLY));
1269                 }
1270                 /* BB to be implemented -
1271                    via Windows security descriptors or streams */
1272                 /* CIFSSMBWinSetPerms(xid, pTcon, full_path, mode, uid, gid,
1273                                       cifs_sb->local_nls); */
1274         }
1275
1276         if (attrs->ia_valid & ATTR_ATIME) {
1277                 set_time = TRUE;
1278                 time_buf.LastAccessTime =
1279                     cpu_to_le64(cifs_UnixTimeToNT(attrs->ia_atime));
1280         } else
1281                 time_buf.LastAccessTime = 0;
1282
1283         if (attrs->ia_valid & ATTR_MTIME) {
1284                 set_time = TRUE;
1285                 time_buf.LastWriteTime =
1286                     cpu_to_le64(cifs_UnixTimeToNT(attrs->ia_mtime));
1287         } else
1288                 time_buf.LastWriteTime = 0;
1289         /* Do not set ctime explicitly unless other time
1290            stamps are changed explicitly (i.e. by utime()
1291            since we would then have a mix of client and
1292            server times */
1293            
1294         if (set_time && (attrs->ia_valid & ATTR_CTIME)) {
1295                 set_time = TRUE;
1296                 /* Although Samba throws this field away
1297                 it may be useful to Windows - but we do
1298                 not want to set ctime unless some other
1299                 timestamp is changing */
1300                 cFYI(1, ("CIFS - CTIME changed"));
1301                 time_buf.ChangeTime =
1302                     cpu_to_le64(cifs_UnixTimeToNT(attrs->ia_ctime));
1303         } else
1304                 time_buf.ChangeTime = 0;
1305
1306         if (set_time || time_buf.Attributes) {
1307                 time_buf.CreationTime = 0;      /* do not change */
1308                 /* In the future we should experiment - try setting timestamps
1309                    via Handle (SetFileInfo) instead of by path */
1310                 if (!(pTcon->ses->flags & CIFS_SES_NT4))
1311                         rc = CIFSSMBSetTimes(xid, pTcon, full_path, &time_buf,
1312                                              cifs_sb->local_nls,
1313                                              cifs_sb->mnt_cifs_flags &
1314                                                 CIFS_MOUNT_MAP_SPECIAL_CHR);
1315                 else
1316                         rc = -EOPNOTSUPP;
1317
1318                 if (rc == -EOPNOTSUPP) {
1319                         int oplock = FALSE;
1320                         __u16 netfid;
1321
1322                         cFYI(1, ("calling SetFileInfo since SetPathInfo for "
1323                                  "times not supported by this server"));
1324                         /* BB we could scan to see if we already have it open
1325                            and pass in pid of opener to function */
1326                         rc = CIFSSMBOpen(xid, pTcon, full_path, FILE_OPEN,
1327                                          SYNCHRONIZE | FILE_WRITE_ATTRIBUTES,
1328                                          CREATE_NOT_DIR, &netfid, &oplock,
1329                                          NULL, cifs_sb->local_nls,
1330                                          cifs_sb->mnt_cifs_flags &
1331                                                 CIFS_MOUNT_MAP_SPECIAL_CHR);
1332                         if (rc==0) {
1333                                 rc = CIFSSMBSetFileTimes(xid, pTcon, &time_buf,
1334                                                          netfid);
1335                                 CIFSSMBClose(xid, pTcon, netfid);
1336                         } else {
1337                         /* BB For even older servers we could convert time_buf
1338                            into old DOS style which uses two second
1339                            granularity */
1340
1341                         /* rc = CIFSSMBSetTimesLegacy(xid, pTcon, full_path,
1342                                         &time_buf, cifs_sb->local_nls); */
1343                         }
1344                 }
1345                 /* Even if error on time set, no sense failing the call if
1346                 the server would set the time to a reasonable value anyway,
1347                 and this check ensures that we are not being called from
1348                 sys_utimes in which case we ought to fail the call back to
1349                 the user when the server rejects the call */
1350                 if((rc) && (attrs->ia_valid &&
1351                          (ATTR_MODE | ATTR_GID | ATTR_UID | ATTR_SIZE)))
1352                         rc = 0;
1353         }
1354
1355         /* do not need local check to inode_check_ok since the server does
1356            that */
1357         if (!rc)
1358                 rc = inode_setattr(direntry->d_inode, attrs);
1359 cifs_setattr_exit:
1360         kfree(full_path);
1361         FreeXid(xid);
1362         return rc;
1363 }
1364
1365 void cifs_delete_inode(struct inode *inode)
1366 {
1367         cFYI(1, ("In cifs_delete_inode, inode = 0x%p", inode));
1368         /* may have to add back in if and when safe distributed caching of
1369            directories added e.g. via FindNotify */
1370 }