Merge branch 'master' of /pub/scm/linux/kernel/git/torvalds/linux-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., 2002,2007
5  *   Author(s): Steve French (sfrench@us.ibm.com)
6  *
7  *   This library is free software; you can redistribute it and/or modify
8  *   it under the terms of the GNU Lesser General Public License as published
9  *   by the Free Software Foundation; either version 2.1 of the License, or
10  *   (at your option) any later version.
11  *
12  *   This library is distributed in the hope that it will be useful,
13  *   but WITHOUT ANY WARRANTY; without even the implied warranty of
14  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See
15  *   the GNU Lesser General Public License for more details.
16  *
17  *   You should have received a copy of the GNU Lesser General Public License
18  *   along with this library; if not, write to the Free Software
19  *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
20  */
21 #include <linux/fs.h>
22 #include <linux/stat.h>
23 #include <linux/pagemap.h>
24 #include <asm/div64.h>
25 #include "cifsfs.h"
26 #include "cifspdu.h"
27 #include "cifsglob.h"
28 #include "cifsproto.h"
29 #include "cifs_debug.h"
30 #include "cifs_fs_sb.h"
31
32
33 static void cifs_set_ops(struct inode *inode, const bool is_dfs_referral)
34 {
35         struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
36
37         switch (inode->i_mode & S_IFMT) {
38         case S_IFREG:
39                 inode->i_op = &cifs_file_inode_ops;
40                 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DIRECT_IO) {
41                         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_BRL)
42                                 inode->i_fop = &cifs_file_direct_nobrl_ops;
43                         else
44                                 inode->i_fop = &cifs_file_direct_ops;
45                 } else if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_BRL)
46                         inode->i_fop = &cifs_file_nobrl_ops;
47                 else { /* not direct, send byte range locks */
48                         inode->i_fop = &cifs_file_ops;
49                 }
50
51
52                 /* check if server can support readpages */
53                 if (cifs_sb->tcon->ses->server->maxBuf <
54                                 PAGE_CACHE_SIZE + MAX_CIFS_HDR_SIZE)
55                         inode->i_data.a_ops = &cifs_addr_ops_smallbuf;
56                 else
57                         inode->i_data.a_ops = &cifs_addr_ops;
58                 break;
59         case S_IFDIR:
60                 if (is_dfs_referral) {
61                         inode->i_op = &cifs_dfs_referral_inode_operations;
62                 } else {
63                         inode->i_op = &cifs_dir_inode_ops;
64                         inode->i_fop = &cifs_dir_ops;
65                 }
66                 break;
67         case S_IFLNK:
68                 inode->i_op = &cifs_symlink_inode_ops;
69                 break;
70         default:
71                 init_special_inode(inode, inode->i_mode, inode->i_rdev);
72                 break;
73         }
74 }
75
76 static void cifs_unix_info_to_inode(struct inode *inode,
77                 FILE_UNIX_BASIC_INFO *info, int force_uid_gid)
78 {
79         struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
80         struct cifsInodeInfo *cifsInfo = CIFS_I(inode);
81         __u64 num_of_bytes = le64_to_cpu(info->NumOfBytes);
82         __u64 end_of_file = le64_to_cpu(info->EndOfFile);
83
84         inode->i_atime = cifs_NTtimeToUnix(le64_to_cpu(info->LastAccessTime));
85         inode->i_mtime =
86                 cifs_NTtimeToUnix(le64_to_cpu(info->LastModificationTime));
87         inode->i_ctime = cifs_NTtimeToUnix(le64_to_cpu(info->LastStatusChange));
88         inode->i_mode = le64_to_cpu(info->Permissions);
89
90         /*
91          * Since we set the inode type below we need to mask off
92          * to avoid strange results if bits set above.
93          */
94         inode->i_mode &= ~S_IFMT;
95         switch (le32_to_cpu(info->Type)) {
96         case UNIX_FILE:
97                 inode->i_mode |= S_IFREG;
98                 break;
99         case UNIX_SYMLINK:
100                 inode->i_mode |= S_IFLNK;
101                 break;
102         case UNIX_DIR:
103                 inode->i_mode |= S_IFDIR;
104                 break;
105         case UNIX_CHARDEV:
106                 inode->i_mode |= S_IFCHR;
107                 inode->i_rdev = MKDEV(le64_to_cpu(info->DevMajor),
108                                       le64_to_cpu(info->DevMinor) & MINORMASK);
109                 break;
110         case UNIX_BLOCKDEV:
111                 inode->i_mode |= S_IFBLK;
112                 inode->i_rdev = MKDEV(le64_to_cpu(info->DevMajor),
113                                       le64_to_cpu(info->DevMinor) & MINORMASK);
114                 break;
115         case UNIX_FIFO:
116                 inode->i_mode |= S_IFIFO;
117                 break;
118         case UNIX_SOCKET:
119                 inode->i_mode |= S_IFSOCK;
120                 break;
121         default:
122                 /* safest to call it a file if we do not know */
123                 inode->i_mode |= S_IFREG;
124                 cFYI(1, ("unknown type %d", le32_to_cpu(info->Type)));
125                 break;
126         }
127
128         if ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_OVERR_UID) &&
129             !force_uid_gid)
130                 inode->i_uid = cifs_sb->mnt_uid;
131         else
132                 inode->i_uid = le64_to_cpu(info->Uid);
133
134         if ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_OVERR_GID) &&
135             !force_uid_gid)
136                 inode->i_gid = cifs_sb->mnt_gid;
137         else
138                 inode->i_gid = le64_to_cpu(info->Gid);
139
140         inode->i_nlink = le64_to_cpu(info->Nlinks);
141
142         spin_lock(&inode->i_lock);
143         if (is_size_safe_to_change(cifsInfo, end_of_file)) {
144                 /*
145                  * We can not safely change the file size here if the client
146                  * is writing to it due to potential races.
147                  */
148                 i_size_write(inode, end_of_file);
149
150                 /*
151                  * i_blocks is not related to (i_size / i_blksize),
152                  * but instead 512 byte (2**9) size is required for
153                  * calculating num blocks.
154                  */
155                 inode->i_blocks = (512 - 1 + num_of_bytes) >> 9;
156         }
157         spin_unlock(&inode->i_lock);
158 }
159
160 static const unsigned char *cifs_get_search_path(struct cifsTconInfo *pTcon,
161                                         const char *search_path)
162 {
163         int tree_len;
164         int path_len;
165         char *tmp_path;
166
167         if (!(pTcon->Flags & SMB_SHARE_IS_IN_DFS))
168                 return search_path;
169
170         /* use full path name for working with DFS */
171         tree_len = strnlen(pTcon->treeName, MAX_TREE_SIZE + 1);
172         path_len = strnlen(search_path, MAX_PATHCONF);
173
174         tmp_path = kmalloc(tree_len+path_len+1, GFP_KERNEL);
175         if (tmp_path == NULL)
176                 return search_path;
177
178         strncpy(tmp_path, pTcon->treeName, tree_len);
179         strncpy(tmp_path+tree_len, search_path, path_len);
180         tmp_path[tree_len+path_len] = 0;
181         return tmp_path;
182 }
183
184 int cifs_get_inode_info_unix(struct inode **pinode,
185         const unsigned char *search_path, struct super_block *sb, int xid)
186 {
187         int rc = 0;
188         FILE_UNIX_BASIC_INFO findData;
189         struct cifsTconInfo *pTcon;
190         struct inode *inode;
191         struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
192         const unsigned char *full_path;
193         bool is_dfs_referral = false;
194
195         pTcon = cifs_sb->tcon;
196         cFYI(1, ("Getting info on %s", search_path));
197
198         full_path = cifs_get_search_path(pTcon, search_path);
199
200 try_again_CIFSSMBUnixQPathInfo:
201         /* could have done a find first instead but this returns more info */
202         rc = CIFSSMBUnixQPathInfo(xid, pTcon, full_path, &findData,
203                                   cifs_sb->local_nls, cifs_sb->mnt_cifs_flags &
204                                         CIFS_MOUNT_MAP_SPECIAL_CHR);
205 /*      dump_mem("\nUnixQPathInfo return data", &findData,
206                  sizeof(findData)); */
207         if (rc) {
208                 if (rc == -EREMOTE && !is_dfs_referral) {
209                         is_dfs_referral = true;
210                         full_path = search_path;
211                         goto try_again_CIFSSMBUnixQPathInfo;
212                 }
213                 goto cgiiu_exit;
214         } else {
215                 struct cifsInodeInfo *cifsInfo;
216                 __u64 num_of_bytes = le64_to_cpu(findData.NumOfBytes);
217                 __u64 end_of_file = le64_to_cpu(findData.EndOfFile);
218
219                 /* get new inode */
220                 if (*pinode == NULL) {
221                         *pinode = new_inode(sb);
222                         if (*pinode == NULL) {
223                                 rc = -ENOMEM;
224                                 goto cgiiu_exit;
225                         }
226                         /* Is an i_ino of zero legal? */
227                         /* Are there sanity checks we can use to ensure that
228                            the server is really filling in that field? */
229                         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM) {
230                                 (*pinode)->i_ino =
231                                         (unsigned long)findData.UniqueId;
232                         } /* note ino incremented to unique num in new_inode */
233                         if (sb->s_flags & MS_NOATIME)
234                                 (*pinode)->i_flags |= S_NOATIME | S_NOCMTIME;
235
236                         insert_inode_hash(*pinode);
237                 }
238
239                 inode = *pinode;
240                 cifsInfo = CIFS_I(inode);
241
242                 cFYI(1, ("Old time %ld", cifsInfo->time));
243                 cifsInfo->time = jiffies;
244                 cFYI(1, ("New time %ld", cifsInfo->time));
245                 /* this is ok to set on every inode revalidate */
246                 atomic_set(&cifsInfo->inUse, 1);
247
248                 cifs_unix_info_to_inode(inode, &findData, 0);
249
250
251                 if (num_of_bytes < end_of_file)
252                         cFYI(1, ("allocation size less than end of file"));
253                 cFYI(1, ("Size %ld and blocks %llu",
254                         (unsigned long) inode->i_size,
255                         (unsigned long long)inode->i_blocks));
256
257                 cifs_set_ops(inode, is_dfs_referral);
258         }
259 cgiiu_exit:
260         if (full_path != search_path)
261                 kfree(full_path);
262         return rc;
263 }
264
265 static int decode_sfu_inode(struct inode *inode, __u64 size,
266                             const unsigned char *path,
267                             struct cifs_sb_info *cifs_sb, int xid)
268 {
269         int rc;
270         int oplock = FALSE;
271         __u16 netfid;
272         struct cifsTconInfo *pTcon = cifs_sb->tcon;
273         char buf[24];
274         unsigned int bytes_read;
275         char *pbuf;
276
277         pbuf = buf;
278
279         if (size == 0) {
280                 inode->i_mode |= S_IFIFO;
281                 return 0;
282         } else if (size < 8) {
283                 return -EINVAL;  /* EOPNOTSUPP? */
284         }
285
286         rc = CIFSSMBOpen(xid, pTcon, path, FILE_OPEN, GENERIC_READ,
287                          CREATE_NOT_DIR, &netfid, &oplock, NULL,
288                          cifs_sb->local_nls,
289                          cifs_sb->mnt_cifs_flags &
290                                 CIFS_MOUNT_MAP_SPECIAL_CHR);
291         if (rc == 0) {
292                 int buf_type = CIFS_NO_BUFFER;
293                         /* Read header */
294                 rc = CIFSSMBRead(xid, pTcon,
295                                  netfid,
296                                  24 /* length */, 0 /* offset */,
297                                  &bytes_read, &pbuf, &buf_type);
298                 if ((rc == 0) && (bytes_read >= 8)) {
299                         if (memcmp("IntxBLK", pbuf, 8) == 0) {
300                                 cFYI(1, ("Block device"));
301                                 inode->i_mode |= S_IFBLK;
302                                 if (bytes_read == 24) {
303                                         /* we have enough to decode dev num */
304                                         __u64 mjr; /* major */
305                                         __u64 mnr; /* minor */
306                                         mjr = le64_to_cpu(*(__le64 *)(pbuf+8));
307                                         mnr = le64_to_cpu(*(__le64 *)(pbuf+16));
308                                         inode->i_rdev = MKDEV(mjr, mnr);
309                                 }
310                         } else if (memcmp("IntxCHR", pbuf, 8) == 0) {
311                                 cFYI(1, ("Char device"));
312                                 inode->i_mode |= S_IFCHR;
313                                 if (bytes_read == 24) {
314                                         /* we have enough to decode dev num */
315                                         __u64 mjr; /* major */
316                                         __u64 mnr; /* minor */
317                                         mjr = le64_to_cpu(*(__le64 *)(pbuf+8));
318                                         mnr = le64_to_cpu(*(__le64 *)(pbuf+16));
319                                         inode->i_rdev = MKDEV(mjr, mnr);
320                                 }
321                         } else if (memcmp("IntxLNK", pbuf, 7) == 0) {
322                                 cFYI(1, ("Symlink"));
323                                 inode->i_mode |= S_IFLNK;
324                         } else {
325                                 inode->i_mode |= S_IFREG; /* file? */
326                                 rc = -EOPNOTSUPP;
327                         }
328                 } else {
329                         inode->i_mode |= S_IFREG; /* then it is a file */
330                         rc = -EOPNOTSUPP; /* or some unknown SFU type */
331                 }
332                 CIFSSMBClose(xid, pTcon, netfid);
333         }
334         return rc;
335 }
336
337 #define SFBITS_MASK (S_ISVTX | S_ISGID | S_ISUID)  /* SETFILEBITS valid bits */
338
339 static int get_sfu_mode(struct inode *inode,
340                         const unsigned char *path,
341                         struct cifs_sb_info *cifs_sb, int xid)
342 {
343 #ifdef CONFIG_CIFS_XATTR
344         ssize_t rc;
345         char ea_value[4];
346         __u32 mode;
347
348         rc = CIFSSMBQueryEA(xid, cifs_sb->tcon, path, "SETFILEBITS",
349                         ea_value, 4 /* size of buf */, cifs_sb->local_nls,
350                 cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR);
351         if (rc < 0)
352                 return (int)rc;
353         else if (rc > 3) {
354                 mode = le32_to_cpu(*((__le32 *)ea_value));
355                 inode->i_mode &= ~SFBITS_MASK;
356                 cFYI(1, ("special bits 0%o org mode 0%o", mode, inode->i_mode));
357                 inode->i_mode = (mode &  SFBITS_MASK) | inode->i_mode;
358                 cFYI(1, ("special mode bits 0%o", mode));
359                 return 0;
360         } else {
361                 return 0;
362         }
363 #else
364         return -EOPNOTSUPP;
365 #endif
366 }
367
368 int cifs_get_inode_info(struct inode **pinode,
369         const unsigned char *search_path, FILE_ALL_INFO *pfindData,
370         struct super_block *sb, int xid)
371 {
372         int rc = 0;
373         struct cifsTconInfo *pTcon;
374         struct inode *inode;
375         struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
376         const unsigned char *full_path = NULL;
377         char *buf = NULL;
378         int adjustTZ = FALSE;
379         bool is_dfs_referral = false;
380
381         pTcon = cifs_sb->tcon;
382         cFYI(1, ("Getting info on %s", search_path));
383
384         if ((pfindData == NULL) && (*pinode != NULL)) {
385                 if (CIFS_I(*pinode)->clientCanCacheRead) {
386                         cFYI(1, ("No need to revalidate cached inode sizes"));
387                         return rc;
388                 }
389         }
390
391         /* if file info not passed in then get it from server */
392         if (pfindData == NULL) {
393                 buf = kmalloc(sizeof(FILE_ALL_INFO), GFP_KERNEL);
394                 if (buf == NULL)
395                         return -ENOMEM;
396                 pfindData = (FILE_ALL_INFO *)buf;
397
398                 full_path = cifs_get_search_path(pTcon, search_path);
399
400 try_again_CIFSSMBQPathInfo:
401                 /* could do find first instead but this returns more info */
402                 rc = CIFSSMBQPathInfo(xid, pTcon, full_path, pfindData,
403                               0 /* not legacy */,
404                               cifs_sb->local_nls, cifs_sb->mnt_cifs_flags &
405                                 CIFS_MOUNT_MAP_SPECIAL_CHR);
406                 /* BB optimize code so we do not make the above call
407                 when server claims no NT SMB support and the above call
408                 failed at least once - set flag in tcon or mount */
409                 if ((rc == -EOPNOTSUPP) || (rc == -EINVAL)) {
410                         rc = SMBQueryInformation(xid, pTcon, full_path,
411                                         pfindData, cifs_sb->local_nls,
412                                         cifs_sb->mnt_cifs_flags &
413                                           CIFS_MOUNT_MAP_SPECIAL_CHR);
414                         adjustTZ = TRUE;
415                 }
416         }
417         /* dump_mem("\nQPathInfo return data",&findData, sizeof(findData)); */
418         if (rc) {
419                 if (rc == -EREMOTE && !is_dfs_referral) {
420                         is_dfs_referral = true;
421                         full_path = search_path;
422                         goto try_again_CIFSSMBQPathInfo;
423                 }
424                 goto cgii_exit;
425         } else {
426                 struct cifsInodeInfo *cifsInfo;
427                 __u32 attr = le32_to_cpu(pfindData->Attributes);
428
429                 /* get new inode */
430                 if (*pinode == NULL) {
431                         *pinode = new_inode(sb);
432                         if (*pinode == NULL) {
433                                 rc = -ENOMEM;
434                                 goto cgii_exit;
435                         }
436                         /* Is an i_ino of zero legal? Can we use that to check
437                            if the server supports returning inode numbers?  Are
438                            there other sanity checks we can use to ensure that
439                            the server is really filling in that field? */
440
441                         /* We can not use the IndexNumber field by default from
442                            Windows or Samba (in ALL_INFO buf) but we can request
443                            it explicitly.  It may not be unique presumably if
444                            the server has multiple devices mounted under one
445                            share */
446
447                         /* There may be higher info levels that work but are
448                            there Windows server or network appliances for which
449                            IndexNumber field is not guaranteed unique? */
450
451                         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM) {
452                                 int rc1 = 0;
453                                 __u64 inode_num;
454
455                                 rc1 = CIFSGetSrvInodeNumber(xid, pTcon,
456                                         search_path, &inode_num,
457                                         cifs_sb->local_nls,
458                                         cifs_sb->mnt_cifs_flags &
459                                                 CIFS_MOUNT_MAP_SPECIAL_CHR);
460                                 if (rc1) {
461                                         cFYI(1, ("GetSrvInodeNum rc %d", rc1));
462                                         /* BB EOPNOSUPP disable SERVER_INUM? */
463                                 } else /* do we need cast or hash to ino? */
464                                         (*pinode)->i_ino = inode_num;
465                         } /* else ino incremented to unique num in new_inode*/
466                         if (sb->s_flags & MS_NOATIME)
467                                 (*pinode)->i_flags |= S_NOATIME | S_NOCMTIME;
468                         insert_inode_hash(*pinode);
469                 }
470                 inode = *pinode;
471                 cifsInfo = CIFS_I(inode);
472                 cifsInfo->cifsAttrs = attr;
473                 cFYI(1, ("Old time %ld", cifsInfo->time));
474                 cifsInfo->time = jiffies;
475                 cFYI(1, ("New time %ld", cifsInfo->time));
476
477                 /* blksize needs to be multiple of two. So safer to default to
478                 blksize and blkbits set in superblock so 2**blkbits and blksize
479                 will match rather than setting to:
480                 (pTcon->ses->server->maxBuf - MAX_CIFS_HDR_SIZE) & 0xFFFFFE00;*/
481
482                 /* Linux can not store file creation time so ignore it */
483                 if (pfindData->LastAccessTime)
484                         inode->i_atime = cifs_NTtimeToUnix
485                                 (le64_to_cpu(pfindData->LastAccessTime));
486                 else /* do not need to use current_fs_time - time not stored */
487                         inode->i_atime = CURRENT_TIME;
488                 inode->i_mtime =
489                     cifs_NTtimeToUnix(le64_to_cpu(pfindData->LastWriteTime));
490                 inode->i_ctime =
491                     cifs_NTtimeToUnix(le64_to_cpu(pfindData->ChangeTime));
492                 cFYI(0, ("Attributes came in as 0x%x", attr));
493                 if (adjustTZ && (pTcon->ses) && (pTcon->ses->server)) {
494                         inode->i_ctime.tv_sec += pTcon->ses->server->timeAdj;
495                         inode->i_mtime.tv_sec += pTcon->ses->server->timeAdj;
496                 }
497
498                 /* set default mode. will override for dirs below */
499                 if (atomic_read(&cifsInfo->inUse) == 0)
500                         /* new inode, can safely set these fields */
501                         inode->i_mode = cifs_sb->mnt_file_mode;
502                 else /* since we set the inode type below we need to mask off
503                      to avoid strange results if type changes and both
504                      get orred in */
505                         inode->i_mode &= ~S_IFMT;
506 /*              if (attr & ATTR_REPARSE)  */
507                 /* We no longer handle these as symlinks because we could not
508                    follow them due to the absolute path with drive letter */
509                 if (attr & ATTR_DIRECTORY) {
510                 /* override default perms since we do not do byte range locking
511                    on dirs */
512                         inode->i_mode = cifs_sb->mnt_dir_mode;
513                         inode->i_mode |= S_IFDIR;
514                 } else if ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_UNX_EMUL) &&
515                            (cifsInfo->cifsAttrs & ATTR_SYSTEM) &&
516                            /* No need to le64 convert size of zero */
517                            (pfindData->EndOfFile == 0)) {
518                         inode->i_mode = cifs_sb->mnt_file_mode;
519                         inode->i_mode |= S_IFIFO;
520 /* BB Finish for SFU style symlinks and devices */
521                 } else if ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_UNX_EMUL) &&
522                            (cifsInfo->cifsAttrs & ATTR_SYSTEM)) {
523                         if (decode_sfu_inode(inode,
524                                          le64_to_cpu(pfindData->EndOfFile),
525                                          search_path,
526                                          cifs_sb, xid))
527                                 cFYI(1, ("Unrecognized sfu inode type"));
528
529                         cFYI(1, ("sfu mode 0%o", inode->i_mode));
530                 } else {
531                         inode->i_mode |= S_IFREG;
532                         /* treat the dos attribute of read-only as read-only
533                            mode e.g. 555 */
534                         if (cifsInfo->cifsAttrs & ATTR_READONLY)
535                                 inode->i_mode &= ~(S_IWUGO);
536                         else if ((inode->i_mode & S_IWUGO) == 0)
537                                 /* the ATTR_READONLY flag may have been */
538                                 /* changed on server -- set any w bits  */
539                                 /* allowed by mnt_file_mode             */
540                                 inode->i_mode |= (S_IWUGO &
541                                                   cifs_sb->mnt_file_mode);
542                 /* BB add code here -
543                    validate if device or weird share or device type? */
544                 }
545
546                 spin_lock(&inode->i_lock);
547                 if (is_size_safe_to_change(cifsInfo,
548                                            le64_to_cpu(pfindData->EndOfFile))) {
549                         /* can not safely shrink the file size here if the
550                            client is writing to it due to potential races */
551                         i_size_write(inode, le64_to_cpu(pfindData->EndOfFile));
552
553                         /* 512 bytes (2**9) is the fake blocksize that must be
554                            used for this calculation */
555                         inode->i_blocks = (512 - 1 + le64_to_cpu(
556                                            pfindData->AllocationSize)) >> 9;
557                 }
558                 spin_unlock(&inode->i_lock);
559
560                 inode->i_nlink = le32_to_cpu(pfindData->NumberOfLinks);
561
562                 /* BB fill in uid and gid here? with help from winbind?
563                    or retrieve from NTFS stream extended attribute */
564 #ifdef CONFIG_CIFS_EXPERIMENTAL
565                 /* fill in 0777 bits from ACL */
566                 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_CIFS_ACL) {
567                         cFYI(1, ("Getting mode bits from ACL"));
568                         acl_to_uid_mode(inode, search_path);
569                 }
570 #endif
571                 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_UNX_EMUL) {
572                         /* fill in remaining high mode bits e.g. SUID, VTX */
573                         get_sfu_mode(inode, search_path, cifs_sb, xid);
574                 } else if (atomic_read(&cifsInfo->inUse) == 0) {
575                         inode->i_uid = cifs_sb->mnt_uid;
576                         inode->i_gid = cifs_sb->mnt_gid;
577                         /* set so we do not keep refreshing these fields with
578                            bad data after user has changed them in memory */
579                         atomic_set(&cifsInfo->inUse, 1);
580                 }
581
582                 cifs_set_ops(inode, is_dfs_referral);
583         }
584 cgii_exit:
585         if (full_path != search_path)
586                 kfree(full_path);
587         kfree(buf);
588         return rc;
589 }
590
591 static const struct inode_operations cifs_ipc_inode_ops = {
592         .lookup = cifs_lookup,
593 };
594
595 /* gets root inode */
596 struct inode *cifs_iget(struct super_block *sb, unsigned long ino)
597 {
598         int xid;
599         struct cifs_sb_info *cifs_sb;
600         struct inode *inode;
601         long rc;
602
603         inode = iget_locked(sb, ino);
604         if (!inode)
605                 return ERR_PTR(-ENOMEM);
606         if (!(inode->i_state & I_NEW))
607                 return inode;
608
609         cifs_sb = CIFS_SB(inode->i_sb);
610         xid = GetXid();
611
612         if (cifs_sb->tcon->unix_ext)
613                 rc = cifs_get_inode_info_unix(&inode, "", inode->i_sb, xid);
614         else
615                 rc = cifs_get_inode_info(&inode, "", NULL, inode->i_sb, xid);
616         if (rc && cifs_sb->tcon->ipc) {
617                 cFYI(1, ("ipc connection - fake read inode"));
618                 inode->i_mode |= S_IFDIR;
619                 inode->i_nlink = 2;
620                 inode->i_op = &cifs_ipc_inode_ops;
621                 inode->i_fop = &simple_dir_operations;
622                 inode->i_uid = cifs_sb->mnt_uid;
623                 inode->i_gid = cifs_sb->mnt_gid;
624                 _FreeXid(xid);
625                 iget_failed(inode);
626                 return ERR_PTR(rc);
627         }
628
629         unlock_new_inode(inode);
630
631         /* can not call macro FreeXid here since in a void func
632          * TODO: This is no longer true
633          */
634         _FreeXid(xid);
635         return inode;
636 }
637
638 int cifs_unlink(struct inode *inode, struct dentry *direntry)
639 {
640         int rc = 0;
641         int xid;
642         struct cifs_sb_info *cifs_sb;
643         struct cifsTconInfo *pTcon;
644         char *full_path = NULL;
645         struct cifsInodeInfo *cifsInode;
646         FILE_BASIC_INFO *pinfo_buf;
647
648         cFYI(1, ("cifs_unlink, inode = 0x%p", inode));
649
650         xid = GetXid();
651
652         if (inode)
653                 cifs_sb = CIFS_SB(inode->i_sb);
654         else
655                 cifs_sb = CIFS_SB(direntry->d_sb);
656         pTcon = cifs_sb->tcon;
657
658         /* Unlink can be called from rename so we can not grab the sem here
659            since we deadlock otherwise */
660 /*      mutex_lock(&direntry->d_sb->s_vfs_rename_mutex);*/
661         full_path = build_path_from_dentry(direntry);
662 /*      mutex_unlock(&direntry->d_sb->s_vfs_rename_mutex);*/
663         if (full_path == NULL) {
664                 FreeXid(xid);
665                 return -ENOMEM;
666         }
667
668         if ((pTcon->ses->capabilities & CAP_UNIX) &&
669                 (CIFS_UNIX_POSIX_PATH_OPS_CAP &
670                         le64_to_cpu(pTcon->fsUnixInfo.Capability))) {
671                 rc = CIFSPOSIXDelFile(xid, pTcon, full_path,
672                         SMB_POSIX_UNLINK_FILE_TARGET, cifs_sb->local_nls,
673                         cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR);
674                 cFYI(1, ("posix del rc %d", rc));
675                 if ((rc == 0) || (rc == -ENOENT))
676                         goto psx_del_no_retry;
677         }
678
679         rc = CIFSSMBDelFile(xid, pTcon, full_path, cifs_sb->local_nls,
680                         cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR);
681 psx_del_no_retry:
682         if (!rc) {
683                 if (direntry->d_inode)
684                         drop_nlink(direntry->d_inode);
685         } else if (rc == -ENOENT) {
686                 d_drop(direntry);
687         } else if (rc == -ETXTBSY) {
688                 int oplock = FALSE;
689                 __u16 netfid;
690
691                 rc = CIFSSMBOpen(xid, pTcon, full_path, FILE_OPEN, DELETE,
692                                  CREATE_NOT_DIR | CREATE_DELETE_ON_CLOSE,
693                                  &netfid, &oplock, NULL, cifs_sb->local_nls,
694                                  cifs_sb->mnt_cifs_flags &
695                                         CIFS_MOUNT_MAP_SPECIAL_CHR);
696                 if (rc == 0) {
697                         CIFSSMBRenameOpenFile(xid, pTcon, netfid, NULL,
698                                               cifs_sb->local_nls,
699                                               cifs_sb->mnt_cifs_flags &
700                                                 CIFS_MOUNT_MAP_SPECIAL_CHR);
701                         CIFSSMBClose(xid, pTcon, netfid);
702                         if (direntry->d_inode)
703                                 drop_nlink(direntry->d_inode);
704                 }
705         } else if (rc == -EACCES) {
706                 /* try only if r/o attribute set in local lookup data? */
707                 pinfo_buf = kzalloc(sizeof(FILE_BASIC_INFO), GFP_KERNEL);
708                 if (pinfo_buf) {
709                         /* ATTRS set to normal clears r/o bit */
710                         pinfo_buf->Attributes = cpu_to_le32(ATTR_NORMAL);
711                         if (!(pTcon->ses->flags & CIFS_SES_NT4))
712                                 rc = CIFSSMBSetTimes(xid, pTcon, full_path,
713                                                      pinfo_buf,
714                                                      cifs_sb->local_nls,
715                                                      cifs_sb->mnt_cifs_flags &
716                                                         CIFS_MOUNT_MAP_SPECIAL_CHR);
717                         else
718                                 rc = -EOPNOTSUPP;
719
720                         if (rc == -EOPNOTSUPP) {
721                                 int oplock = FALSE;
722                                 __u16 netfid;
723                         /*      rc = CIFSSMBSetAttrLegacy(xid, pTcon,
724                                                           full_path,
725                                                           (__u16)ATTR_NORMAL,
726                                                           cifs_sb->local_nls);
727                            For some strange reason it seems that NT4 eats the
728                            old setattr call without actually setting the
729                            attributes so on to the third attempted workaround
730                            */
731
732                         /* BB could scan to see if we already have it open
733                            and pass in pid of opener to function */
734                                 rc = CIFSSMBOpen(xid, pTcon, full_path,
735                                                  FILE_OPEN, SYNCHRONIZE |
736                                                  FILE_WRITE_ATTRIBUTES, 0,
737                                                  &netfid, &oplock, NULL,
738                                                  cifs_sb->local_nls,
739                                                  cifs_sb->mnt_cifs_flags &
740                                                     CIFS_MOUNT_MAP_SPECIAL_CHR);
741                                 if (rc == 0) {
742                                         rc = CIFSSMBSetFileTimes(xid, pTcon,
743                                                                  pinfo_buf,
744                                                                  netfid);
745                                         CIFSSMBClose(xid, pTcon, netfid);
746                                 }
747                         }
748                         kfree(pinfo_buf);
749                 }
750                 if (rc == 0) {
751                         rc = CIFSSMBDelFile(xid, pTcon, full_path,
752                                             cifs_sb->local_nls,
753                                             cifs_sb->mnt_cifs_flags &
754                                                 CIFS_MOUNT_MAP_SPECIAL_CHR);
755                         if (!rc) {
756                                 if (direntry->d_inode)
757                                         drop_nlink(direntry->d_inode);
758                         } else if (rc == -ETXTBSY) {
759                                 int oplock = FALSE;
760                                 __u16 netfid;
761
762                                 rc = CIFSSMBOpen(xid, pTcon, full_path,
763                                                  FILE_OPEN, DELETE,
764                                                  CREATE_NOT_DIR |
765                                                  CREATE_DELETE_ON_CLOSE,
766                                                  &netfid, &oplock, NULL,
767                                                  cifs_sb->local_nls,
768                                                  cifs_sb->mnt_cifs_flags &
769                                                     CIFS_MOUNT_MAP_SPECIAL_CHR);
770                                 if (rc == 0) {
771                                         CIFSSMBRenameOpenFile(xid, pTcon,
772                                                 netfid, NULL,
773                                                 cifs_sb->local_nls,
774                                                 cifs_sb->mnt_cifs_flags &
775                                                     CIFS_MOUNT_MAP_SPECIAL_CHR);
776                                         CIFSSMBClose(xid, pTcon, netfid);
777                                         if (direntry->d_inode)
778                                                 drop_nlink(direntry->d_inode);
779                                 }
780                         /* BB if rc = -ETXTBUSY goto the rename logic BB */
781                         }
782                 }
783         }
784         if (direntry->d_inode) {
785                 cifsInode = CIFS_I(direntry->d_inode);
786                 cifsInode->time = 0;    /* will force revalidate to get info
787                                            when needed */
788                 direntry->d_inode->i_ctime = current_fs_time(inode->i_sb);
789         }
790         if (inode) {
791                 inode->i_ctime = inode->i_mtime = current_fs_time(inode->i_sb);
792                 cifsInode = CIFS_I(inode);
793                 cifsInode->time = 0;    /* force revalidate of dir as well */
794         }
795
796         kfree(full_path);
797         FreeXid(xid);
798         return rc;
799 }
800
801 static void posix_fill_in_inode(struct inode *tmp_inode,
802         FILE_UNIX_BASIC_INFO *pData, int isNewInode)
803 {
804         struct cifsInodeInfo *cifsInfo = CIFS_I(tmp_inode);
805         loff_t local_size;
806         struct timespec local_mtime;
807
808         cifsInfo->time = jiffies;
809         atomic_inc(&cifsInfo->inUse);
810
811         /* save mtime and size */
812         local_mtime = tmp_inode->i_mtime;
813         local_size  = tmp_inode->i_size;
814
815         cifs_unix_info_to_inode(tmp_inode, pData, 1);
816         cifs_set_ops(tmp_inode, false);
817
818         if (!S_ISREG(tmp_inode->i_mode))
819                 return;
820
821         /*
822          * No sense invalidating pages for new inode
823          * since we we have not started caching
824          * readahead file data yet.
825          */
826         if (isNewInode)
827                 return;
828
829         if (timespec_equal(&tmp_inode->i_mtime, &local_mtime) &&
830                 (local_size == tmp_inode->i_size)) {
831                 cFYI(1, ("inode exists but unchanged"));
832         } else {
833                 /* file may have changed on server */
834                 cFYI(1, ("invalidate inode, readdir detected change"));
835                 invalidate_remote_inode(tmp_inode);
836         }
837 }
838
839 int cifs_mkdir(struct inode *inode, struct dentry *direntry, int mode)
840 {
841         int rc = 0;
842         int xid;
843         struct cifs_sb_info *cifs_sb;
844         struct cifsTconInfo *pTcon;
845         char *full_path = NULL;
846         struct inode *newinode = NULL;
847
848         cFYI(1, ("In cifs_mkdir, mode = 0x%x inode = 0x%p", mode, inode));
849
850         xid = GetXid();
851
852         cifs_sb = CIFS_SB(inode->i_sb);
853         pTcon = cifs_sb->tcon;
854
855         full_path = build_path_from_dentry(direntry);
856         if (full_path == NULL) {
857                 FreeXid(xid);
858                 return -ENOMEM;
859         }
860
861         if ((pTcon->ses->capabilities & CAP_UNIX) &&
862                 (CIFS_UNIX_POSIX_PATH_OPS_CAP &
863                         le64_to_cpu(pTcon->fsUnixInfo.Capability))) {
864                 u32 oplock = 0;
865                 FILE_UNIX_BASIC_INFO *pInfo =
866                         kzalloc(sizeof(FILE_UNIX_BASIC_INFO), GFP_KERNEL);
867                 if (pInfo == NULL) {
868                         rc = -ENOMEM;
869                         goto mkdir_out;
870                 }
871
872                 mode &= ~current->fs->umask;
873                 rc = CIFSPOSIXCreate(xid, pTcon, SMB_O_DIRECTORY | SMB_O_CREAT,
874                                 mode, NULL /* netfid */, pInfo, &oplock,
875                                 full_path, cifs_sb->local_nls,
876                                 cifs_sb->mnt_cifs_flags &
877                                         CIFS_MOUNT_MAP_SPECIAL_CHR);
878                 if (rc == -EOPNOTSUPP) {
879                         kfree(pInfo);
880                         goto mkdir_retry_old;
881                 } else if (rc) {
882                         cFYI(1, ("posix mkdir returned 0x%x", rc));
883                         d_drop(direntry);
884                 } else {
885                         if (pInfo->Type == cpu_to_le32(-1)) {
886                                 /* no return info, go query for it */
887                                 kfree(pInfo);
888                                 goto mkdir_get_info;
889                         }
890 /*BB check (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SET_UID ) to see if need
891         to set uid/gid */
892                         inc_nlink(inode);
893                         if (pTcon->nocase)
894                                 direntry->d_op = &cifs_ci_dentry_ops;
895                         else
896                                 direntry->d_op = &cifs_dentry_ops;
897
898                         newinode = new_inode(inode->i_sb);
899                         if (newinode == NULL) {
900                                 kfree(pInfo);
901                                 goto mkdir_get_info;
902                         }
903                         /* Is an i_ino of zero legal? */
904                         /* Are there sanity checks we can use to ensure that
905                            the server is really filling in that field? */
906                         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM) {
907                                 newinode->i_ino =
908                                         (unsigned long)pInfo->UniqueId;
909                         } /* note ino incremented to unique num in new_inode */
910                         if (inode->i_sb->s_flags & MS_NOATIME)
911                                 newinode->i_flags |= S_NOATIME | S_NOCMTIME;
912                         newinode->i_nlink = 2;
913
914                         insert_inode_hash(newinode);
915                         d_instantiate(direntry, newinode);
916
917                         /* we already checked in POSIXCreate whether
918                            frame was long enough */
919                         posix_fill_in_inode(direntry->d_inode,
920                                         pInfo, 1 /* NewInode */);
921 #ifdef CONFIG_CIFS_DEBUG2
922                         cFYI(1, ("instantiated dentry %p %s to inode %p",
923                                 direntry, direntry->d_name.name, newinode));
924
925                         if (newinode->i_nlink != 2)
926                                 cFYI(1, ("unexpected number of links %d",
927                                         newinode->i_nlink));
928 #endif
929                 }
930                 kfree(pInfo);
931                 goto mkdir_out;
932         }
933 mkdir_retry_old:
934         /* BB add setting the equivalent of mode via CreateX w/ACLs */
935         rc = CIFSSMBMkDir(xid, pTcon, full_path, cifs_sb->local_nls,
936                           cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR);
937         if (rc) {
938                 cFYI(1, ("cifs_mkdir returned 0x%x", rc));
939                 d_drop(direntry);
940         } else {
941 mkdir_get_info:
942                 inc_nlink(inode);
943                 if (pTcon->unix_ext)
944                         rc = cifs_get_inode_info_unix(&newinode, full_path,
945                                                       inode->i_sb, xid);
946                 else
947                         rc = cifs_get_inode_info(&newinode, full_path, NULL,
948                                                  inode->i_sb, xid);
949
950                 if (pTcon->nocase)
951                         direntry->d_op = &cifs_ci_dentry_ops;
952                 else
953                         direntry->d_op = &cifs_dentry_ops;
954                 d_instantiate(direntry, newinode);
955                  /* setting nlink not necessary except in cases where we
956                   * failed to get it from the server or was set bogus */
957                 if ((direntry->d_inode) && (direntry->d_inode->i_nlink < 2))
958                                 direntry->d_inode->i_nlink = 2;
959                 if (pTcon->unix_ext) {
960                         mode &= ~current->fs->umask;
961                         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SET_UID) {
962                                 CIFSSMBUnixSetPerms(xid, pTcon, full_path,
963                                                     mode,
964                                                     (__u64)current->fsuid,
965                                                     (__u64)current->fsgid,
966                                                     0 /* dev_t */,
967                                                     cifs_sb->local_nls,
968                                                     cifs_sb->mnt_cifs_flags &
969                                                     CIFS_MOUNT_MAP_SPECIAL_CHR);
970                         } else {
971                                 CIFSSMBUnixSetPerms(xid, pTcon, full_path,
972                                                     mode, (__u64)-1,
973                                                     (__u64)-1, 0 /* dev_t */,
974                                                     cifs_sb->local_nls,
975                                                     cifs_sb->mnt_cifs_flags &
976                                                     CIFS_MOUNT_MAP_SPECIAL_CHR);
977                         }
978                 } else {
979                         /* BB to be implemented via Windows secrty descriptors
980                            eg CIFSSMBWinSetPerms(xid, pTcon, full_path, mode,
981                                                  -1, -1, local_nls); */
982                         if (direntry->d_inode) {
983                                 direntry->d_inode->i_mode = mode;
984                                 direntry->d_inode->i_mode |= S_IFDIR;
985                                 if (cifs_sb->mnt_cifs_flags &
986                                      CIFS_MOUNT_SET_UID) {
987                                         direntry->d_inode->i_uid =
988                                                 current->fsuid;
989                                         direntry->d_inode->i_gid =
990                                                 current->fsgid;
991                                 }
992                         }
993                 }
994         }
995 mkdir_out:
996         kfree(full_path);
997         FreeXid(xid);
998         return rc;
999 }
1000
1001 int cifs_rmdir(struct inode *inode, struct dentry *direntry)
1002 {
1003         int rc = 0;
1004         int xid;
1005         struct cifs_sb_info *cifs_sb;
1006         struct cifsTconInfo *pTcon;
1007         char *full_path = NULL;
1008         struct cifsInodeInfo *cifsInode;
1009
1010         cFYI(1, ("cifs_rmdir, inode = 0x%p", inode));
1011
1012         xid = GetXid();
1013
1014         cifs_sb = CIFS_SB(inode->i_sb);
1015         pTcon = cifs_sb->tcon;
1016
1017         full_path = build_path_from_dentry(direntry);
1018         if (full_path == NULL) {
1019                 FreeXid(xid);
1020                 return -ENOMEM;
1021         }
1022
1023         rc = CIFSSMBRmDir(xid, pTcon, full_path, cifs_sb->local_nls,
1024                           cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR);
1025
1026         if (!rc) {
1027                 drop_nlink(inode);
1028                 spin_lock(&direntry->d_inode->i_lock);
1029                 i_size_write(direntry->d_inode, 0);
1030                 clear_nlink(direntry->d_inode);
1031                 spin_unlock(&direntry->d_inode->i_lock);
1032         }
1033
1034         cifsInode = CIFS_I(direntry->d_inode);
1035         cifsInode->time = 0;    /* force revalidate to go get info when
1036                                    needed */
1037         direntry->d_inode->i_ctime = inode->i_ctime = inode->i_mtime =
1038                 current_fs_time(inode->i_sb);
1039
1040         kfree(full_path);
1041         FreeXid(xid);
1042         return rc;
1043 }
1044
1045 int cifs_rename(struct inode *source_inode, struct dentry *source_direntry,
1046         struct inode *target_inode, struct dentry *target_direntry)
1047 {
1048         char *fromName;
1049         char *toName;
1050         struct cifs_sb_info *cifs_sb_source;
1051         struct cifs_sb_info *cifs_sb_target;
1052         struct cifsTconInfo *pTcon;
1053         int xid;
1054         int rc = 0;
1055
1056         xid = GetXid();
1057
1058         cifs_sb_target = CIFS_SB(target_inode->i_sb);
1059         cifs_sb_source = CIFS_SB(source_inode->i_sb);
1060         pTcon = cifs_sb_source->tcon;
1061
1062         if (pTcon != cifs_sb_target->tcon) {
1063                 FreeXid(xid);
1064                 return -EXDEV;  /* BB actually could be allowed if same server,
1065                                    but different share.
1066                                    Might eventually add support for this */
1067         }
1068
1069         /* we already  have the rename sem so we do not need to grab it again
1070            here to protect the path integrity */
1071         fromName = build_path_from_dentry(source_direntry);
1072         toName = build_path_from_dentry(target_direntry);
1073         if ((fromName == NULL) || (toName == NULL)) {
1074                 rc = -ENOMEM;
1075                 goto cifs_rename_exit;
1076         }
1077
1078         rc = CIFSSMBRename(xid, pTcon, fromName, toName,
1079                            cifs_sb_source->local_nls,
1080                            cifs_sb_source->mnt_cifs_flags &
1081                                 CIFS_MOUNT_MAP_SPECIAL_CHR);
1082         if (rc == -EEXIST) {
1083                 /* check if they are the same file because rename of hardlinked
1084                    files is a noop */
1085                 FILE_UNIX_BASIC_INFO *info_buf_source;
1086                 FILE_UNIX_BASIC_INFO *info_buf_target;
1087
1088                 info_buf_source =
1089                         kmalloc(2 * sizeof(FILE_UNIX_BASIC_INFO), GFP_KERNEL);
1090                 if (info_buf_source != NULL) {
1091                         info_buf_target = info_buf_source + 1;
1092                         if (pTcon->unix_ext)
1093                                 rc = CIFSSMBUnixQPathInfo(xid, pTcon, fromName,
1094                                         info_buf_source,
1095                                         cifs_sb_source->local_nls,
1096                                         cifs_sb_source->mnt_cifs_flags &
1097                                                 CIFS_MOUNT_MAP_SPECIAL_CHR);
1098                         /* else rc is still EEXIST so will fall through to
1099                            unlink the target and retry rename */
1100                         if (rc == 0) {
1101                                 rc = CIFSSMBUnixQPathInfo(xid, pTcon, toName,
1102                                                 info_buf_target,
1103                                                 cifs_sb_target->local_nls,
1104                                                 /* remap based on source sb */
1105                                                 cifs_sb_source->mnt_cifs_flags &
1106                                                     CIFS_MOUNT_MAP_SPECIAL_CHR);
1107                         }
1108                         if ((rc == 0) &&
1109                             (info_buf_source->UniqueId ==
1110                              info_buf_target->UniqueId)) {
1111                         /* do not rename since the files are hardlinked which
1112                            is a noop */
1113                         } else {
1114                         /* we either can not tell the files are hardlinked
1115                            (as with Windows servers) or files are not
1116                            hardlinked so delete the target manually before
1117                            renaming to follow POSIX rather than Windows
1118                            semantics */
1119                                 cifs_unlink(target_inode, target_direntry);
1120                                 rc = CIFSSMBRename(xid, pTcon, fromName,
1121                                                    toName,
1122                                                    cifs_sb_source->local_nls,
1123                                                    cifs_sb_source->mnt_cifs_flags
1124                                                    & CIFS_MOUNT_MAP_SPECIAL_CHR);
1125                         }
1126                         kfree(info_buf_source);
1127                 } /* if we can not get memory just leave rc as EEXIST */
1128         }
1129
1130         if (rc)
1131                 cFYI(1, ("rename rc %d", rc));
1132
1133         if ((rc == -EIO) || (rc == -EEXIST)) {
1134                 int oplock = FALSE;
1135                 __u16 netfid;
1136
1137                 /* BB FIXME Is Generic Read correct for rename? */
1138                 /* if renaming directory - we should not say CREATE_NOT_DIR,
1139                    need to test renaming open directory, also GENERIC_READ
1140                    might not right be right access to request */
1141                 rc = CIFSSMBOpen(xid, pTcon, fromName, FILE_OPEN, GENERIC_READ,
1142                                  CREATE_NOT_DIR, &netfid, &oplock, NULL,
1143                                  cifs_sb_source->local_nls,
1144                                  cifs_sb_source->mnt_cifs_flags &
1145                                         CIFS_MOUNT_MAP_SPECIAL_CHR);
1146                 if (rc == 0) {
1147                         rc = CIFSSMBRenameOpenFile(xid, pTcon, netfid, toName,
1148                                               cifs_sb_source->local_nls,
1149                                               cifs_sb_source->mnt_cifs_flags &
1150                                                 CIFS_MOUNT_MAP_SPECIAL_CHR);
1151                         CIFSSMBClose(xid, pTcon, netfid);
1152                 }
1153         }
1154
1155 cifs_rename_exit:
1156         kfree(fromName);
1157         kfree(toName);
1158         FreeXid(xid);
1159         return rc;
1160 }
1161
1162 int cifs_revalidate(struct dentry *direntry)
1163 {
1164         int xid;
1165         int rc = 0, wbrc = 0;
1166         char *full_path;
1167         struct cifs_sb_info *cifs_sb;
1168         struct cifsInodeInfo *cifsInode;
1169         loff_t local_size;
1170         struct timespec local_mtime;
1171         int invalidate_inode = FALSE;
1172
1173         if (direntry->d_inode == NULL)
1174                 return -ENOENT;
1175
1176         cifsInode = CIFS_I(direntry->d_inode);
1177
1178         if (cifsInode == NULL)
1179                 return -ENOENT;
1180
1181         /* no sense revalidating inode info on file that no one can write */
1182         if (CIFS_I(direntry->d_inode)->clientCanCacheRead)
1183                 return rc;
1184
1185         xid = GetXid();
1186
1187         cifs_sb = CIFS_SB(direntry->d_sb);
1188
1189         /* can not safely grab the rename sem here if rename calls revalidate
1190            since that would deadlock */
1191         full_path = build_path_from_dentry(direntry);
1192         if (full_path == NULL) {
1193                 FreeXid(xid);
1194                 return -ENOMEM;
1195         }
1196         cFYI(1, ("Revalidate: %s inode 0x%p count %d dentry: 0x%p d_time %ld "
1197                  "jiffies %ld", full_path, direntry->d_inode,
1198                  direntry->d_inode->i_count.counter, direntry,
1199                  direntry->d_time, jiffies));
1200
1201         if (cifsInode->time == 0) {
1202                 /* was set to zero previously to force revalidate */
1203         } else if (time_before(jiffies, cifsInode->time + HZ) &&
1204                    lookupCacheEnabled) {
1205                 if ((S_ISREG(direntry->d_inode->i_mode) == 0) ||
1206                     (direntry->d_inode->i_nlink == 1)) {
1207                         kfree(full_path);
1208                         FreeXid(xid);
1209                         return rc;
1210                 } else {
1211                         cFYI(1, ("Have to revalidate file due to hardlinks"));
1212                 }
1213         }
1214
1215         /* save mtime and size */
1216         local_mtime = direntry->d_inode->i_mtime;
1217         local_size = direntry->d_inode->i_size;
1218
1219         if (cifs_sb->tcon->unix_ext) {
1220                 rc = cifs_get_inode_info_unix(&direntry->d_inode, full_path,
1221                                               direntry->d_sb, xid);
1222                 if (rc) {
1223                         cFYI(1, ("error on getting revalidate info %d", rc));
1224 /*                      if (rc != -ENOENT)
1225                                 rc = 0; */      /* BB should we cache info on
1226                                                    certain errors? */
1227                 }
1228         } else {
1229                 rc = cifs_get_inode_info(&direntry->d_inode, full_path, NULL,
1230                                          direntry->d_sb, xid);
1231                 if (rc) {
1232                         cFYI(1, ("error on getting revalidate info %d", rc));
1233 /*                      if (rc != -ENOENT)
1234                                 rc = 0; */      /* BB should we cache info on
1235                                                    certain errors? */
1236                 }
1237         }
1238         /* should we remap certain errors, access denied?, to zero */
1239
1240         /* if not oplocked, we invalidate inode pages if mtime or file size
1241            had changed on server */
1242
1243         if (timespec_equal(&local_mtime, &direntry->d_inode->i_mtime) &&
1244             (local_size == direntry->d_inode->i_size)) {
1245                 cFYI(1, ("cifs_revalidate - inode unchanged"));
1246         } else {
1247                 /* file may have changed on server */
1248                 if (cifsInode->clientCanCacheRead) {
1249                         /* no need to invalidate inode pages since we were the
1250                            only ones who could have modified the file and the
1251                            server copy is staler than ours */
1252                 } else {
1253                         invalidate_inode = TRUE;
1254                 }
1255         }
1256
1257         /* can not grab this sem since kernel filesys locking documentation
1258            indicates i_mutex may be taken by the kernel on lookup and rename
1259            which could deadlock if we grab the i_mutex here as well */
1260 /*      mutex_lock(&direntry->d_inode->i_mutex);*/
1261         /* need to write out dirty pages here  */
1262         if (direntry->d_inode->i_mapping) {
1263                 /* do we need to lock inode until after invalidate completes
1264                    below? */
1265                 wbrc = filemap_fdatawrite(direntry->d_inode->i_mapping);
1266                 if (wbrc)
1267                         CIFS_I(direntry->d_inode)->write_behind_rc = wbrc;
1268         }
1269         if (invalidate_inode) {
1270         /* shrink_dcache not necessary now that cifs dentry ops
1271         are exported for negative dentries */
1272 /*              if (S_ISDIR(direntry->d_inode->i_mode))
1273                         shrink_dcache_parent(direntry); */
1274                 if (S_ISREG(direntry->d_inode->i_mode)) {
1275                         if (direntry->d_inode->i_mapping)
1276                                 wbrc = filemap_fdatawait(direntry->d_inode->i_mapping);
1277                                 if (wbrc)
1278                                         CIFS_I(direntry->d_inode)->write_behind_rc = wbrc;
1279                         /* may eventually have to do this for open files too */
1280                         if (list_empty(&(cifsInode->openFileList))) {
1281                                 /* changed on server - flush read ahead pages */
1282                                 cFYI(1, ("Invalidating read ahead data on "
1283                                          "closed file"));
1284                                 invalidate_remote_inode(direntry->d_inode);
1285                         }
1286                 }
1287         }
1288 /*      mutex_unlock(&direntry->d_inode->i_mutex); */
1289
1290         kfree(full_path);
1291         FreeXid(xid);
1292         return rc;
1293 }
1294
1295 int cifs_getattr(struct vfsmount *mnt, struct dentry *dentry,
1296         struct kstat *stat)
1297 {
1298         int err = cifs_revalidate(dentry);
1299         if (!err) {
1300                 generic_fillattr(dentry->d_inode, stat);
1301                 stat->blksize = CIFS_MAX_MSGSIZE;
1302         }
1303         return err;
1304 }
1305
1306 static int cifs_truncate_page(struct address_space *mapping, loff_t from)
1307 {
1308         pgoff_t index = from >> PAGE_CACHE_SHIFT;
1309         unsigned offset = from & (PAGE_CACHE_SIZE - 1);
1310         struct page *page;
1311         int rc = 0;
1312
1313         page = grab_cache_page(mapping, index);
1314         if (!page)
1315                 return -ENOMEM;
1316
1317         zero_user_segment(page, offset, PAGE_CACHE_SIZE);
1318         unlock_page(page);
1319         page_cache_release(page);
1320         return rc;
1321 }
1322
1323 static int cifs_vmtruncate(struct inode *inode, loff_t offset)
1324 {
1325         struct address_space *mapping = inode->i_mapping;
1326         unsigned long limit;
1327
1328         spin_lock(&inode->i_lock);
1329         if (inode->i_size < offset)
1330                 goto do_expand;
1331         /*
1332          * truncation of in-use swapfiles is disallowed - it would cause
1333          * subsequent swapout to scribble on the now-freed blocks.
1334          */
1335         if (IS_SWAPFILE(inode)) {
1336                 spin_unlock(&inode->i_lock);
1337                 goto out_busy;
1338         }
1339         i_size_write(inode, offset);
1340         spin_unlock(&inode->i_lock);
1341         /*
1342          * unmap_mapping_range is called twice, first simply for efficiency
1343          * so that truncate_inode_pages does fewer single-page unmaps. However
1344          * after this first call, and before truncate_inode_pages finishes,
1345          * it is possible for private pages to be COWed, which remain after
1346          * truncate_inode_pages finishes, hence the second unmap_mapping_range
1347          * call must be made for correctness.
1348          */
1349         unmap_mapping_range(mapping, offset + PAGE_SIZE - 1, 0, 1);
1350         truncate_inode_pages(mapping, offset);
1351         unmap_mapping_range(mapping, offset + PAGE_SIZE - 1, 0, 1);
1352         goto out_truncate;
1353
1354 do_expand:
1355         limit = current->signal->rlim[RLIMIT_FSIZE].rlim_cur;
1356         if (limit != RLIM_INFINITY && offset > limit) {
1357                 spin_unlock(&inode->i_lock);
1358                 goto out_sig;
1359         }
1360         if (offset > inode->i_sb->s_maxbytes) {
1361                 spin_unlock(&inode->i_lock);
1362                 goto out_big;
1363         }
1364         i_size_write(inode, offset);
1365         spin_unlock(&inode->i_lock);
1366 out_truncate:
1367         if (inode->i_op && inode->i_op->truncate)
1368                 inode->i_op->truncate(inode);
1369         return 0;
1370 out_sig:
1371         send_sig(SIGXFSZ, current, 0);
1372 out_big:
1373         return -EFBIG;
1374 out_busy:
1375         return -ETXTBSY;
1376 }
1377
1378 int cifs_setattr(struct dentry *direntry, struct iattr *attrs)
1379 {
1380         int xid;
1381         struct cifs_sb_info *cifs_sb;
1382         struct cifsTconInfo *pTcon;
1383         char *full_path = NULL;
1384         int rc = -EACCES;
1385         struct cifsFileInfo *open_file = NULL;
1386         FILE_BASIC_INFO time_buf;
1387         int set_time = FALSE;
1388         int set_dosattr = FALSE;
1389         __u64 mode = 0xFFFFFFFFFFFFFFFFULL;
1390         __u64 uid = 0xFFFFFFFFFFFFFFFFULL;
1391         __u64 gid = 0xFFFFFFFFFFFFFFFFULL;
1392         struct cifsInodeInfo *cifsInode;
1393
1394         xid = GetXid();
1395
1396         cFYI(1, ("setattr on file %s attrs->iavalid 0x%x",
1397                  direntry->d_name.name, attrs->ia_valid));
1398
1399         cifs_sb = CIFS_SB(direntry->d_inode->i_sb);
1400         pTcon = cifs_sb->tcon;
1401
1402         if ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_PERM) == 0) {
1403                 /* check if we have permission to change attrs */
1404                 rc = inode_change_ok(direntry->d_inode, attrs);
1405                 if (rc < 0) {
1406                         FreeXid(xid);
1407                         return rc;
1408                 } else
1409                         rc = 0;
1410         }
1411
1412         full_path = build_path_from_dentry(direntry);
1413         if (full_path == NULL) {
1414                 FreeXid(xid);
1415                 return -ENOMEM;
1416         }
1417         cifsInode = CIFS_I(direntry->d_inode);
1418
1419         /* BB check if we need to refresh inode from server now ? BB */
1420
1421         if (attrs->ia_valid & ATTR_SIZE) {
1422                 /*
1423                    Flush data before changing file size on server. If the
1424                    flush returns error, store it to report later and continue.
1425                    BB: This should be smarter. Why bother flushing pages that
1426                    will be truncated anyway? Also, should we error out here if
1427                    the flush returns error?
1428                  */
1429                 rc = filemap_write_and_wait(direntry->d_inode->i_mapping);
1430                 if (rc != 0) {
1431                         CIFS_I(direntry->d_inode)->write_behind_rc = rc;
1432                         rc = 0;
1433                 }
1434
1435                 /* To avoid spurious oplock breaks from server, in the case of
1436                    inodes that we already have open, avoid doing path based
1437                    setting of file size if we can do it by handle.
1438                    This keeps our caching token (oplock) and avoids timeouts
1439                    when the local oplock break takes longer to flush
1440                    writebehind data than the SMB timeout for the SetPathInfo
1441                    request would allow */
1442
1443                 open_file = find_writable_file(cifsInode);
1444                 if (open_file) {
1445                         __u16 nfid = open_file->netfid;
1446                         __u32 npid = open_file->pid;
1447                         rc = CIFSSMBSetFileSize(xid, pTcon, attrs->ia_size,
1448                                                 nfid, npid, FALSE);
1449                         atomic_dec(&open_file->wrtPending);
1450                         cFYI(1, ("SetFSize for attrs rc = %d", rc));
1451                         if ((rc == -EINVAL) || (rc == -EOPNOTSUPP)) {
1452                                 unsigned int bytes_written;
1453                                 rc = CIFSSMBWrite(xid, pTcon,
1454                                                   nfid, 0, attrs->ia_size,
1455                                                   &bytes_written, NULL, NULL,
1456                                                   1 /* 45 seconds */);
1457                                 cFYI(1, ("Wrt seteof rc %d", rc));
1458                         }
1459                 } else
1460                         rc = -EINVAL;
1461
1462                 if (rc != 0) {
1463                         /* Set file size by pathname rather than by handle
1464                            either because no valid, writeable file handle for
1465                            it was found or because there was an error setting
1466                            it by handle */
1467                         rc = CIFSSMBSetEOF(xid, pTcon, full_path,
1468                                            attrs->ia_size, FALSE,
1469                                            cifs_sb->local_nls,
1470                                            cifs_sb->mnt_cifs_flags &
1471                                                 CIFS_MOUNT_MAP_SPECIAL_CHR);
1472                         cFYI(1, ("SetEOF by path (setattrs) rc = %d", rc));
1473                         if ((rc == -EINVAL) || (rc == -EOPNOTSUPP)) {
1474                                 __u16 netfid;
1475                                 int oplock = FALSE;
1476
1477                                 rc = SMBLegacyOpen(xid, pTcon, full_path,
1478                                         FILE_OPEN,
1479                                         SYNCHRONIZE | FILE_WRITE_ATTRIBUTES,
1480                                         CREATE_NOT_DIR, &netfid, &oplock,
1481                                         NULL, cifs_sb->local_nls,
1482                                         cifs_sb->mnt_cifs_flags &
1483                                                 CIFS_MOUNT_MAP_SPECIAL_CHR);
1484                                 if (rc == 0) {
1485                                         unsigned int bytes_written;
1486                                         rc = CIFSSMBWrite(xid, pTcon,
1487                                                         netfid, 0,
1488                                                         attrs->ia_size,
1489                                                         &bytes_written, NULL,
1490                                                         NULL, 1 /* 45 sec */);
1491                                         cFYI(1, ("wrt seteof rc %d", rc));
1492                                         CIFSSMBClose(xid, pTcon, netfid);
1493                                 }
1494
1495                         }
1496                 }
1497
1498                 /* Server is ok setting allocation size implicitly - no need
1499                    to call:
1500                 CIFSSMBSetEOF(xid, pTcon, full_path, attrs->ia_size, TRUE,
1501                          cifs_sb->local_nls);
1502                    */
1503
1504                 if (rc == 0) {
1505                         rc = cifs_vmtruncate(direntry->d_inode, attrs->ia_size);
1506                         cifs_truncate_page(direntry->d_inode->i_mapping,
1507                                            direntry->d_inode->i_size);
1508                 } else
1509                         goto cifs_setattr_exit;
1510         }
1511         if (attrs->ia_valid & ATTR_UID) {
1512                 cFYI(1, ("UID changed to %d", attrs->ia_uid));
1513                 uid = attrs->ia_uid;
1514         }
1515         if (attrs->ia_valid & ATTR_GID) {
1516                 cFYI(1, ("GID changed to %d", attrs->ia_gid));
1517                 gid = attrs->ia_gid;
1518         }
1519
1520         time_buf.Attributes = 0;
1521
1522         /* skip mode change if it's just for clearing setuid/setgid */
1523         if (attrs->ia_valid & (ATTR_KILL_SUID|ATTR_KILL_SGID))
1524                 attrs->ia_valid &= ~ATTR_MODE;
1525
1526         if (attrs->ia_valid & ATTR_MODE) {
1527                 cFYI(1, ("Mode changed to 0x%x", attrs->ia_mode));
1528                 mode = attrs->ia_mode;
1529         }
1530
1531         if ((pTcon->unix_ext)
1532             && (attrs->ia_valid & (ATTR_MODE | ATTR_GID | ATTR_UID)))
1533                 rc = CIFSSMBUnixSetPerms(xid, pTcon, full_path, mode, uid, gid,
1534                                          0 /* dev_t */, cifs_sb->local_nls,
1535                                          cifs_sb->mnt_cifs_flags &
1536                                                 CIFS_MOUNT_MAP_SPECIAL_CHR);
1537         else if (attrs->ia_valid & ATTR_MODE) {
1538                 rc = 0;
1539 #ifdef CONFIG_CIFS_EXPERIMENTAL
1540                 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_CIFS_ACL)
1541                         rc = mode_to_acl(direntry->d_inode, full_path, mode);
1542                 else if ((mode & S_IWUGO) == 0) {
1543 #else
1544                 if ((mode & S_IWUGO) == 0) {
1545 #endif
1546                         /* not writeable */
1547                         if ((cifsInode->cifsAttrs & ATTR_READONLY) == 0) {
1548                                 set_dosattr = TRUE;
1549                                 time_buf.Attributes =
1550                                         cpu_to_le32(cifsInode->cifsAttrs |
1551                                                     ATTR_READONLY);
1552                         }
1553                 } else if (cifsInode->cifsAttrs & ATTR_READONLY) {
1554                         /* If file is readonly on server, we would
1555                         not be able to write to it - so if any write
1556                         bit is enabled for user or group or other we
1557                         need to at least try to remove r/o dos attr */
1558                         set_dosattr = TRUE;
1559                         time_buf.Attributes = cpu_to_le32(cifsInode->cifsAttrs &
1560                                             (~ATTR_READONLY));
1561                         /* Windows ignores set to zero */
1562                         if (time_buf.Attributes == 0)
1563                                 time_buf.Attributes |= cpu_to_le32(ATTR_NORMAL);
1564                 }
1565 #ifdef CONFIG_CIFS_EXPERIMENTAL
1566                 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_CIFS_ACL)
1567                         mode_to_acl(direntry->d_inode, full_path, mode);
1568 #endif
1569         }
1570
1571         if (attrs->ia_valid & ATTR_ATIME) {
1572                 set_time = TRUE;
1573                 time_buf.LastAccessTime =
1574                     cpu_to_le64(cifs_UnixTimeToNT(attrs->ia_atime));
1575         } else
1576                 time_buf.LastAccessTime = 0;
1577
1578         if (attrs->ia_valid & ATTR_MTIME) {
1579                 set_time = TRUE;
1580                 time_buf.LastWriteTime =
1581                     cpu_to_le64(cifs_UnixTimeToNT(attrs->ia_mtime));
1582         } else
1583                 time_buf.LastWriteTime = 0;
1584         /* Do not set ctime explicitly unless other time
1585            stamps are changed explicitly (i.e. by utime()
1586            since we would then have a mix of client and
1587            server times */
1588
1589         if (set_time && (attrs->ia_valid & ATTR_CTIME)) {
1590                 set_time = TRUE;
1591                 /* Although Samba throws this field away
1592                 it may be useful to Windows - but we do
1593                 not want to set ctime unless some other
1594                 timestamp is changing */
1595                 cFYI(1, ("CIFS - CTIME changed"));
1596                 time_buf.ChangeTime =
1597                     cpu_to_le64(cifs_UnixTimeToNT(attrs->ia_ctime));
1598         } else
1599                 time_buf.ChangeTime = 0;
1600
1601         if (set_time || set_dosattr) {
1602                 time_buf.CreationTime = 0;      /* do not change */
1603                 /* In the future we should experiment - try setting timestamps
1604                    via Handle (SetFileInfo) instead of by path */
1605                 if (!(pTcon->ses->flags & CIFS_SES_NT4))
1606                         rc = CIFSSMBSetTimes(xid, pTcon, full_path, &time_buf,
1607                                              cifs_sb->local_nls,
1608                                              cifs_sb->mnt_cifs_flags &
1609                                                 CIFS_MOUNT_MAP_SPECIAL_CHR);
1610                 else
1611                         rc = -EOPNOTSUPP;
1612
1613                 if (rc == -EOPNOTSUPP) {
1614                         int oplock = FALSE;
1615                         __u16 netfid;
1616
1617                         cFYI(1, ("calling SetFileInfo since SetPathInfo for "
1618                                  "times not supported by this server"));
1619                         /* BB we could scan to see if we already have it open
1620                            and pass in pid of opener to function */
1621                         rc = CIFSSMBOpen(xid, pTcon, full_path, FILE_OPEN,
1622                                          SYNCHRONIZE | FILE_WRITE_ATTRIBUTES,
1623                                          CREATE_NOT_DIR, &netfid, &oplock,
1624                                          NULL, cifs_sb->local_nls,
1625                                          cifs_sb->mnt_cifs_flags &
1626                                                 CIFS_MOUNT_MAP_SPECIAL_CHR);
1627                         if (rc == 0) {
1628                                 rc = CIFSSMBSetFileTimes(xid, pTcon, &time_buf,
1629                                                          netfid);
1630                                 CIFSSMBClose(xid, pTcon, netfid);
1631                         } else {
1632                         /* BB For even older servers we could convert time_buf
1633                            into old DOS style which uses two second
1634                            granularity */
1635
1636                         /* rc = CIFSSMBSetTimesLegacy(xid, pTcon, full_path,
1637                                         &time_buf, cifs_sb->local_nls); */
1638                         }
1639                 }
1640                 /* Even if error on time set, no sense failing the call if
1641                 the server would set the time to a reasonable value anyway,
1642                 and this check ensures that we are not being called from
1643                 sys_utimes in which case we ought to fail the call back to
1644                 the user when the server rejects the call */
1645                 if ((rc) && (attrs->ia_valid &
1646                          (ATTR_MODE | ATTR_GID | ATTR_UID | ATTR_SIZE)))
1647                         rc = 0;
1648         }
1649
1650         /* do not need local check to inode_check_ok since the server does
1651            that */
1652         if (!rc)
1653                 rc = inode_setattr(direntry->d_inode, attrs);
1654 cifs_setattr_exit:
1655         kfree(full_path);
1656         FreeXid(xid);
1657         return rc;
1658 }
1659
1660 #if 0
1661 void cifs_delete_inode(struct inode *inode)
1662 {
1663         cFYI(1, ("In cifs_delete_inode, inode = 0x%p", inode));
1664         /* may have to add back in if and when safe distributed caching of
1665            directories added e.g. via FindNotify */
1666 }
1667 #endif