[CIFS] Missing flags2 for DFS
[sfrench/cifs-2.6.git] / fs / cifs / readdir.c
1 /*
2  *   fs/cifs/readdir.c
3  *
4  *   Directory search handling
5  * 
6  *   Copyright (C) International Business Machines  Corp., 2004, 2005
7  *   Author(s): Steve French (sfrench@us.ibm.com)
8  *
9  *   This library is free software; you can redistribute it and/or modify
10  *   it under the terms of the GNU Lesser General Public License as published
11  *   by the Free Software Foundation; either version 2.1 of the License, or
12  *   (at your option) any later version.
13  *
14  *   This library is distributed in the hope that it will be useful,
15  *   but WITHOUT ANY WARRANTY; without even the implied warranty of
16  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See
17  *   the GNU Lesser General Public License for more details.
18  *
19  *   You should have received a copy of the GNU Lesser General Public License
20  *   along with this library; if not, write to the Free Software
21  *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
22  */
23 #include <linux/fs.h>
24 #include <linux/pagemap.h>
25 #include <linux/stat.h>
26 #include <linux/smp_lock.h>
27 #include "cifspdu.h"
28 #include "cifsglob.h"
29 #include "cifsproto.h"
30 #include "cifs_unicode.h"
31 #include "cifs_debug.h"
32 #include "cifs_fs_sb.h"
33 #include "cifsfs.h"
34
35 #ifdef CONFIG_CIFS_DEBUG2
36 static void dump_cifs_file_struct(struct file *file, char *label)
37 {
38         struct cifsFileInfo * cf;
39
40         if(file) {
41                 cf = file->private_data;
42                 if(cf == NULL) {
43                         cFYI(1,("empty cifs private file data"));
44                         return;
45                 }
46                 if(cf->invalidHandle) {
47                         cFYI(1,("invalid handle"));
48                 }
49                 if(cf->srch_inf.endOfSearch) {
50                         cFYI(1,("end of search"));
51                 }
52                 if(cf->srch_inf.emptyDir) {
53                         cFYI(1,("empty dir"));
54                 }
55                 
56         }
57 }
58 #endif /* DEBUG2 */
59
60 /* Returns one if new inode created (which therefore needs to be hashed) */
61 /* Might check in the future if inode number changed so we can rehash inode */
62 static int construct_dentry(struct qstr *qstring, struct file *file,
63         struct inode **ptmp_inode, struct dentry **pnew_dentry)
64 {
65         struct dentry *tmp_dentry;
66         struct cifs_sb_info *cifs_sb;
67         struct cifsTconInfo *pTcon;
68         int rc = 0;
69
70         cFYI(1, ("For %s", qstring->name));
71         cifs_sb = CIFS_SB(file->f_dentry->d_sb);
72         pTcon = cifs_sb->tcon;
73
74         qstring->hash = full_name_hash(qstring->name, qstring->len);
75         tmp_dentry = d_lookup(file->f_dentry, qstring);
76         if (tmp_dentry) {
77                 cFYI(0, ("existing dentry with inode 0x%p", tmp_dentry->d_inode));
78                 *ptmp_inode = tmp_dentry->d_inode;
79 /* BB overwrite old name? i.e. tmp_dentry->d_name and tmp_dentry->d_name.len??*/
80                 if(*ptmp_inode == NULL) {
81                         *ptmp_inode = new_inode(file->f_dentry->d_sb);
82                         if(*ptmp_inode == NULL)
83                                 return rc;
84                         rc = 1;
85                 }
86         } else {
87                 tmp_dentry = d_alloc(file->f_dentry, qstring);
88                 if(tmp_dentry == NULL) {
89                         cERROR(1,("Failed allocating dentry"));
90                         *ptmp_inode = NULL;
91                         return rc;
92                 }
93
94                 *ptmp_inode = new_inode(file->f_dentry->d_sb);
95                 if (pTcon->nocase)
96                         tmp_dentry->d_op = &cifs_ci_dentry_ops;
97                 else
98                         tmp_dentry->d_op = &cifs_dentry_ops;
99                 if(*ptmp_inode == NULL)
100                         return rc;
101                 rc = 2;
102         }
103
104         tmp_dentry->d_time = jiffies;
105         *pnew_dentry = tmp_dentry;
106         return rc;
107 }
108
109 static void AdjustForTZ(struct cifsTconInfo * tcon, struct inode * inode)
110 {
111         if((tcon) && (tcon->ses) && (tcon->ses->server)) {
112                 inode->i_ctime.tv_sec += tcon->ses->server->timeAdj;
113                 inode->i_mtime.tv_sec += tcon->ses->server->timeAdj;
114                 inode->i_atime.tv_sec += tcon->ses->server->timeAdj;
115         }
116         return;
117 }
118
119
120 static void fill_in_inode(struct inode *tmp_inode, int new_buf_type,
121                 char * buf, int *pobject_type, int isNewInode)
122 {
123         loff_t local_size;
124         struct timespec local_mtime;
125
126         struct cifsInodeInfo *cifsInfo = CIFS_I(tmp_inode);
127         struct cifs_sb_info *cifs_sb = CIFS_SB(tmp_inode->i_sb);
128         __u32 attr;
129         __u64 allocation_size;
130         __u64 end_of_file;
131
132         /* save mtime and size */
133         local_mtime = tmp_inode->i_mtime;
134         local_size  = tmp_inode->i_size;
135
136         if(new_buf_type) {
137                 FILE_DIRECTORY_INFO *pfindData = (FILE_DIRECTORY_INFO *)buf;
138
139                 attr = le32_to_cpu(pfindData->ExtFileAttributes);
140                 allocation_size = le64_to_cpu(pfindData->AllocationSize);
141                 end_of_file = le64_to_cpu(pfindData->EndOfFile);
142                 tmp_inode->i_atime =
143                       cifs_NTtimeToUnix(le64_to_cpu(pfindData->LastAccessTime));
144                 tmp_inode->i_mtime =
145                       cifs_NTtimeToUnix(le64_to_cpu(pfindData->LastWriteTime));
146                 tmp_inode->i_ctime =
147                       cifs_NTtimeToUnix(le64_to_cpu(pfindData->ChangeTime));
148         } else { /* legacy, OS2 and DOS style */
149 /*              struct timespec ts;*/
150                 FIND_FILE_STANDARD_INFO * pfindData = 
151                         (FIND_FILE_STANDARD_INFO *)buf;
152
153                 tmp_inode->i_mtime = cnvrtDosUnixTm(
154                                 le16_to_cpu(pfindData->LastWriteDate),
155                                 le16_to_cpu(pfindData->LastWriteTime));
156                 tmp_inode->i_atime = cnvrtDosUnixTm(
157                                 le16_to_cpu(pfindData->LastAccessDate),
158                                 le16_to_cpu(pfindData->LastAccessTime));
159                 tmp_inode->i_ctime = cnvrtDosUnixTm(
160                                 le16_to_cpu(pfindData->LastWriteDate),
161                                 le16_to_cpu(pfindData->LastWriteTime));
162                 AdjustForTZ(cifs_sb->tcon, tmp_inode);
163                 attr = le16_to_cpu(pfindData->Attributes);
164                 allocation_size = le32_to_cpu(pfindData->AllocationSize);
165                 end_of_file = le32_to_cpu(pfindData->DataSize);
166         }
167
168         /* Linux can not store file creation time unfortunately so ignore it */
169
170         cifsInfo->cifsAttrs = attr;
171         cifsInfo->time = jiffies;
172
173         /* treat dos attribute of read-only as read-only mode bit e.g. 555? */
174         /* 2767 perms - indicate mandatory locking */
175                 /* BB fill in uid and gid here? with help from winbind? 
176                    or retrieve from NTFS stream extended attribute */
177         if (atomic_read(&cifsInfo->inUse) == 0) {
178                 tmp_inode->i_uid = cifs_sb->mnt_uid;
179                 tmp_inode->i_gid = cifs_sb->mnt_gid;
180                 /* set default mode. will override for dirs below */
181                 tmp_inode->i_mode = cifs_sb->mnt_file_mode;
182         } else {
183                 /* mask off the type bits since it gets set
184                 below and we do not want to get two type
185                 bits set */
186                 tmp_inode->i_mode &= ~S_IFMT;
187         }
188
189         if (attr & ATTR_DIRECTORY) {
190                 *pobject_type = DT_DIR;
191                 /* override default perms since we do not lock dirs */
192                 if(atomic_read(&cifsInfo->inUse) == 0) {
193                         tmp_inode->i_mode = cifs_sb->mnt_dir_mode;
194                 }
195                 tmp_inode->i_mode |= S_IFDIR;
196         } else if ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_UNX_EMUL) && 
197                    (attr & ATTR_SYSTEM)) {
198                 if (end_of_file == 0)  {
199                         *pobject_type = DT_FIFO;
200                         tmp_inode->i_mode |= S_IFIFO;
201                 } else {
202                         /* rather than get the type here, we mark the
203                         inode as needing revalidate and get the real type
204                         (blk vs chr vs. symlink) later ie in lookup */
205                         *pobject_type = DT_REG;
206                         tmp_inode->i_mode |= S_IFREG; 
207                         cifsInfo->time = 0;     
208                 }
209 /* we no longer mark these because we could not follow them */
210 /*        } else if (attr & ATTR_REPARSE) {
211                 *pobject_type = DT_LNK;
212                 tmp_inode->i_mode |= S_IFLNK; */
213         } else {
214                 *pobject_type = DT_REG;
215                 tmp_inode->i_mode |= S_IFREG;
216                 if (attr & ATTR_READONLY)
217                         tmp_inode->i_mode &= ~(S_IWUGO);
218         } /* could add code here - to validate if device or weird share type? */
219
220         /* can not fill in nlink here as in qpathinfo version and Unx search */
221         if (atomic_read(&cifsInfo->inUse) == 0) {
222                 atomic_set(&cifsInfo->inUse, 1);
223         }
224
225         if (is_size_safe_to_change(cifsInfo)) {
226                 /* can not safely change the file size here if the 
227                 client is writing to it due to potential races */
228                 i_size_write(tmp_inode, end_of_file);
229
230         /* 512 bytes (2**9) is the fake blocksize that must be used */
231         /* for this calculation, even though the reported blocksize is larger */
232                 tmp_inode->i_blocks = (512 - 1 + allocation_size) >> 9;
233         }
234
235         if (allocation_size < end_of_file)
236                 cFYI(1, ("May be sparse file, allocation less than file size"));
237         cFYI(1, ("File Size %ld and blocks %llu and blocksize %ld",
238                 (unsigned long)tmp_inode->i_size,
239                 (unsigned long long)tmp_inode->i_blocks,
240                 tmp_inode->i_blksize));
241         if (S_ISREG(tmp_inode->i_mode)) {
242                 cFYI(1, ("File inode"));
243                 tmp_inode->i_op = &cifs_file_inode_ops;
244                 if(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DIRECT_IO) {
245                         if(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_BRL)
246                                 tmp_inode->i_fop = &cifs_file_direct_nobrl_ops;
247                         else
248                                 tmp_inode->i_fop = &cifs_file_direct_ops;
249                 
250                 } else if(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_BRL)
251                         tmp_inode->i_fop = &cifs_file_nobrl_ops;
252                 else
253                         tmp_inode->i_fop = &cifs_file_ops;
254
255                 if((cifs_sb->tcon) && (cifs_sb->tcon->ses) &&
256                    (cifs_sb->tcon->ses->server->maxBuf <
257                         PAGE_CACHE_SIZE + MAX_CIFS_HDR_SIZE))
258                         tmp_inode->i_data.a_ops = &cifs_addr_ops_smallbuf;
259                 else
260                         tmp_inode->i_data.a_ops = &cifs_addr_ops;
261
262                 if(isNewInode)
263                         return; /* No sense invalidating pages for new inode
264                                    since have not started caching readahead file
265                                    data yet */
266
267                 if (timespec_equal(&tmp_inode->i_mtime, &local_mtime) &&
268                         (local_size == tmp_inode->i_size)) {
269                         cFYI(1, ("inode exists but unchanged"));
270                 } else {
271                         /* file may have changed on server */
272                         cFYI(1, ("invalidate inode, readdir detected change"));
273                         invalidate_remote_inode(tmp_inode);
274                 }
275         } else if (S_ISDIR(tmp_inode->i_mode)) {
276                 cFYI(1, ("Directory inode"));
277                 tmp_inode->i_op = &cifs_dir_inode_ops;
278                 tmp_inode->i_fop = &cifs_dir_ops;
279         } else if (S_ISLNK(tmp_inode->i_mode)) {
280                 cFYI(1, ("Symbolic Link inode"));
281                 tmp_inode->i_op = &cifs_symlink_inode_ops;
282         } else {
283                 cFYI(1, ("Init special inode"));
284                 init_special_inode(tmp_inode, tmp_inode->i_mode,
285                                    tmp_inode->i_rdev);
286         }
287 }
288
289 static void unix_fill_in_inode(struct inode *tmp_inode,
290         FILE_UNIX_INFO *pfindData, int *pobject_type, int isNewInode)
291 {
292         loff_t local_size;
293         struct timespec local_mtime;
294
295         struct cifsInodeInfo *cifsInfo = CIFS_I(tmp_inode);
296         struct cifs_sb_info *cifs_sb = CIFS_SB(tmp_inode->i_sb);
297
298         __u32 type = le32_to_cpu(pfindData->Type);
299         __u64 num_of_bytes = le64_to_cpu(pfindData->NumOfBytes);
300         __u64 end_of_file = le64_to_cpu(pfindData->EndOfFile);
301         cifsInfo->time = jiffies;
302         atomic_inc(&cifsInfo->inUse);
303
304         /* save mtime and size */
305         local_mtime = tmp_inode->i_mtime;
306         local_size  = tmp_inode->i_size;
307
308         tmp_inode->i_atime =
309             cifs_NTtimeToUnix(le64_to_cpu(pfindData->LastAccessTime));
310         tmp_inode->i_mtime =
311             cifs_NTtimeToUnix(le64_to_cpu(pfindData->LastModificationTime));
312         tmp_inode->i_ctime =
313             cifs_NTtimeToUnix(le64_to_cpu(pfindData->LastStatusChange));
314
315         tmp_inode->i_mode = le64_to_cpu(pfindData->Permissions);
316         /* since we set the inode type below we need to mask off type
317            to avoid strange results if bits above were corrupt */
318         tmp_inode->i_mode &= ~S_IFMT;
319         if (type == UNIX_FILE) {
320                 *pobject_type = DT_REG;
321                 tmp_inode->i_mode |= S_IFREG;
322         } else if (type == UNIX_SYMLINK) {
323                 *pobject_type = DT_LNK;
324                 tmp_inode->i_mode |= S_IFLNK;
325         } else if (type == UNIX_DIR) {
326                 *pobject_type = DT_DIR;
327                 tmp_inode->i_mode |= S_IFDIR;
328         } else if (type == UNIX_CHARDEV) {
329                 *pobject_type = DT_CHR;
330                 tmp_inode->i_mode |= S_IFCHR;
331                 tmp_inode->i_rdev = MKDEV(le64_to_cpu(pfindData->DevMajor),
332                                 le64_to_cpu(pfindData->DevMinor) & MINORMASK);
333         } else if (type == UNIX_BLOCKDEV) {
334                 *pobject_type = DT_BLK;
335                 tmp_inode->i_mode |= S_IFBLK;
336                 tmp_inode->i_rdev = MKDEV(le64_to_cpu(pfindData->DevMajor),
337                                 le64_to_cpu(pfindData->DevMinor) & MINORMASK);
338         } else if (type == UNIX_FIFO) {
339                 *pobject_type = DT_FIFO;
340                 tmp_inode->i_mode |= S_IFIFO;
341         } else if (type == UNIX_SOCKET) {
342                 *pobject_type = DT_SOCK;
343                 tmp_inode->i_mode |= S_IFSOCK;
344         } else {
345                 /* safest to just call it a file */
346                 *pobject_type = DT_REG;
347                 tmp_inode->i_mode |= S_IFREG;
348                 cFYI(1,("unknown inode type %d",type)); 
349         }
350
351         tmp_inode->i_uid = le64_to_cpu(pfindData->Uid);
352         tmp_inode->i_gid = le64_to_cpu(pfindData->Gid);
353         tmp_inode->i_nlink = le64_to_cpu(pfindData->Nlinks);
354
355         if (is_size_safe_to_change(cifsInfo)) {
356                 /* can not safely change the file size here if the 
357                 client is writing to it due to potential races */
358                 i_size_write(tmp_inode,end_of_file);
359
360         /* 512 bytes (2**9) is the fake blocksize that must be used */
361         /* for this calculation, not the real blocksize */
362                 tmp_inode->i_blocks = (512 - 1 + num_of_bytes) >> 9;
363         }
364
365         if (S_ISREG(tmp_inode->i_mode)) {
366                 cFYI(1, ("File inode"));
367                 tmp_inode->i_op = &cifs_file_inode_ops;
368
369                 if(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DIRECT_IO) {
370                         if(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_BRL)
371                                 tmp_inode->i_fop = &cifs_file_direct_nobrl_ops;
372                         else
373                                 tmp_inode->i_fop = &cifs_file_direct_ops;
374                 
375                 } else if(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_BRL)
376                         tmp_inode->i_fop = &cifs_file_nobrl_ops;
377                 else
378                         tmp_inode->i_fop = &cifs_file_ops;
379
380                 if((cifs_sb->tcon) && (cifs_sb->tcon->ses) &&
381                    (cifs_sb->tcon->ses->server->maxBuf < 
382                         PAGE_CACHE_SIZE + MAX_CIFS_HDR_SIZE))
383                         tmp_inode->i_data.a_ops = &cifs_addr_ops_smallbuf;
384                 else
385                         tmp_inode->i_data.a_ops = &cifs_addr_ops;
386
387                 if(isNewInode)
388                         return; /* No sense invalidating pages for new inode since we
389                                            have not started caching readahead file data yet */
390
391                 if (timespec_equal(&tmp_inode->i_mtime, &local_mtime) &&
392                         (local_size == tmp_inode->i_size)) {
393                         cFYI(1, ("inode exists but unchanged"));
394                 } else {
395                         /* file may have changed on server */
396                         cFYI(1, ("invalidate inode, readdir detected change"));
397                         invalidate_remote_inode(tmp_inode);
398                 }
399         } else if (S_ISDIR(tmp_inode->i_mode)) {
400                 cFYI(1, ("Directory inode"));
401                 tmp_inode->i_op = &cifs_dir_inode_ops;
402                 tmp_inode->i_fop = &cifs_dir_ops;
403         } else if (S_ISLNK(tmp_inode->i_mode)) {
404                 cFYI(1, ("Symbolic Link inode"));
405                 tmp_inode->i_op = &cifs_symlink_inode_ops;
406 /* tmp_inode->i_fop = *//* do not need to set to anything */
407         } else {
408                 cFYI(1, ("Special inode")); 
409                 init_special_inode(tmp_inode, tmp_inode->i_mode,
410                                    tmp_inode->i_rdev);
411         }
412 }
413
414 static int initiate_cifs_search(const int xid, struct file *file)
415 {
416         int rc = 0;
417         char * full_path;
418         struct cifsFileInfo * cifsFile;
419         struct cifs_sb_info *cifs_sb;
420         struct cifsTconInfo *pTcon;
421
422         if(file->private_data == NULL) {
423                 file->private_data = 
424                         kmalloc(sizeof(struct cifsFileInfo),GFP_KERNEL);
425         }
426
427         if(file->private_data == NULL) {
428                 return -ENOMEM;
429         } else {
430                 memset(file->private_data,0,sizeof(struct cifsFileInfo));
431         }
432         cifsFile = file->private_data;
433         cifsFile->invalidHandle = TRUE;
434         cifsFile->srch_inf.endOfSearch = FALSE;
435
436         if(file->f_dentry == NULL)
437                 return -ENOENT;
438
439         cifs_sb = CIFS_SB(file->f_dentry->d_sb);
440         if(cifs_sb == NULL)
441                 return -EINVAL;
442
443         pTcon = cifs_sb->tcon;
444         if(pTcon == NULL)
445                 return -EINVAL;
446
447         full_path = build_path_from_dentry(file->f_dentry);
448
449         if(full_path == NULL) {
450                 return -ENOMEM;
451         }
452
453         cFYI(1, ("Full path: %s start at: %lld", full_path, file->f_pos));
454
455 ffirst_retry:
456         /* test for Unix extensions */
457         if (pTcon->ses->capabilities & CAP_UNIX) {
458                 cifsFile->srch_inf.info_level = SMB_FIND_FILE_UNIX;
459         } else if ((pTcon->ses->capabilities & 
460                         (CAP_NT_SMBS | CAP_NT_FIND)) == 0) {
461                 cifsFile->srch_inf.info_level = SMB_FIND_FILE_INFO_STANDARD;
462         } else if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM) {
463                 cifsFile->srch_inf.info_level = SMB_FIND_FILE_ID_FULL_DIR_INFO;
464         } else /* not srvinos - BB fixme add check for backlevel? */ {
465                 cifsFile->srch_inf.info_level = SMB_FIND_FILE_DIRECTORY_INFO;
466         }
467
468         rc = CIFSFindFirst(xid, pTcon,full_path,cifs_sb->local_nls,
469                 &cifsFile->netfid, &cifsFile->srch_inf,
470                 cifs_sb->mnt_cifs_flags & 
471                         CIFS_MOUNT_MAP_SPECIAL_CHR, CIFS_DIR_SEP(cifs_sb));
472         if(rc == 0)
473                 cifsFile->invalidHandle = FALSE;
474         if((rc == -EOPNOTSUPP) && 
475                 (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM)) {
476                 cifs_sb->mnt_cifs_flags &= ~CIFS_MOUNT_SERVER_INUM;
477                 goto ffirst_retry;
478         }
479         kfree(full_path);
480         return rc;
481 }
482
483 /* return length of unicode string in bytes */
484 static int cifs_unicode_bytelen(char *str)
485 {
486         int len;
487         __le16 * ustr = (__le16 *)str;
488
489         for(len=0;len <= PATH_MAX;len++) {
490                 if(ustr[len] == 0)
491                         return len << 1;
492         }
493         cFYI(1,("Unicode string longer than PATH_MAX found"));
494         return len << 1;
495 }
496
497 static char *nxt_dir_entry(char *old_entry, char *end_of_smb, int level)
498 {
499         char * new_entry;
500         FILE_DIRECTORY_INFO * pDirInfo = (FILE_DIRECTORY_INFO *)old_entry;
501
502         if(level == SMB_FIND_FILE_INFO_STANDARD) {
503                 FIND_FILE_STANDARD_INFO * pfData;
504                 pfData = (FIND_FILE_STANDARD_INFO *)pDirInfo;
505
506                 new_entry = old_entry + sizeof(FIND_FILE_STANDARD_INFO) +
507                                 pfData->FileNameLength;
508         } else
509                 new_entry = old_entry + le32_to_cpu(pDirInfo->NextEntryOffset);
510         cFYI(1,("new entry %p old entry %p",new_entry,old_entry));
511         /* validate that new_entry is not past end of SMB */
512         if(new_entry >= end_of_smb) {
513                 cERROR(1,
514                       ("search entry %p began after end of SMB %p old entry %p",
515                         new_entry, end_of_smb, old_entry)); 
516                 return NULL;
517         } else if(((level == SMB_FIND_FILE_INFO_STANDARD) &&
518                    (new_entry + sizeof(FIND_FILE_STANDARD_INFO) > end_of_smb)) ||
519                   ((level != SMB_FIND_FILE_INFO_STANDARD) &&
520                    (new_entry + sizeof(FILE_DIRECTORY_INFO) > end_of_smb)))  {
521                 cERROR(1,("search entry %p extends after end of SMB %p",
522                         new_entry, end_of_smb));
523                 return NULL;
524         } else 
525                 return new_entry;
526
527 }
528
529 #define UNICODE_DOT cpu_to_le16(0x2e)
530
531 /* return 0 if no match and 1 for . (current directory) and 2 for .. (parent) */
532 static int cifs_entry_is_dot(char *current_entry, struct cifsFileInfo *cfile)
533 {
534         int rc = 0;
535         char * filename = NULL;
536         int len = 0; 
537
538         if(cfile->srch_inf.info_level == SMB_FIND_FILE_UNIX) {
539                 FILE_UNIX_INFO * pFindData = (FILE_UNIX_INFO *)current_entry;
540                 filename = &pFindData->FileName[0];
541                 if(cfile->srch_inf.unicode) {
542                         len = cifs_unicode_bytelen(filename);
543                 } else {
544                         /* BB should we make this strnlen of PATH_MAX? */
545                         len = strnlen(filename, 5);
546                 }
547         } else if(cfile->srch_inf.info_level == SMB_FIND_FILE_DIRECTORY_INFO) {
548                 FILE_DIRECTORY_INFO * pFindData = 
549                         (FILE_DIRECTORY_INFO *)current_entry;
550                 filename = &pFindData->FileName[0];
551                 len = le32_to_cpu(pFindData->FileNameLength);
552         } else if(cfile->srch_inf.info_level == 
553                         SMB_FIND_FILE_FULL_DIRECTORY_INFO) {
554                 FILE_FULL_DIRECTORY_INFO * pFindData = 
555                         (FILE_FULL_DIRECTORY_INFO *)current_entry;
556                 filename = &pFindData->FileName[0];
557                 len = le32_to_cpu(pFindData->FileNameLength);
558         } else if(cfile->srch_inf.info_level ==
559                         SMB_FIND_FILE_ID_FULL_DIR_INFO) {
560                 SEARCH_ID_FULL_DIR_INFO * pFindData = 
561                         (SEARCH_ID_FULL_DIR_INFO *)current_entry;
562                 filename = &pFindData->FileName[0];
563                 len = le32_to_cpu(pFindData->FileNameLength);
564         } else if(cfile->srch_inf.info_level == 
565                         SMB_FIND_FILE_BOTH_DIRECTORY_INFO) {
566                 FILE_BOTH_DIRECTORY_INFO * pFindData = 
567                         (FILE_BOTH_DIRECTORY_INFO *)current_entry;
568                 filename = &pFindData->FileName[0];
569                 len = le32_to_cpu(pFindData->FileNameLength);
570         } else if(cfile->srch_inf.info_level == SMB_FIND_FILE_INFO_STANDARD) {
571                 FIND_FILE_STANDARD_INFO * pFindData =
572                         (FIND_FILE_STANDARD_INFO *)current_entry;
573                 filename = &pFindData->FileName[0];
574                 len = pFindData->FileNameLength;
575         } else {
576                 cFYI(1,("Unknown findfirst level %d",cfile->srch_inf.info_level));
577         }
578
579         if(filename) {
580                 if(cfile->srch_inf.unicode) {
581                         __le16 *ufilename = (__le16 *)filename;
582                         if(len == 2) {
583                                 /* check for . */
584                                 if(ufilename[0] == UNICODE_DOT)
585                                         rc = 1;
586                         } else if(len == 4) {
587                                 /* check for .. */
588                                 if((ufilename[0] == UNICODE_DOT)
589                                    &&(ufilename[1] == UNICODE_DOT))
590                                         rc = 2;
591                         }
592                 } else /* ASCII */ {
593                         if(len == 1) {
594                                 if(filename[0] == '.') 
595                                         rc = 1;
596                         } else if(len == 2) {
597                                 if((filename[0] == '.') && (filename[1] == '.')) 
598                                         rc = 2;
599                         }
600                 }
601         }
602
603         return rc;
604 }
605
606 /* Check if directory that we are searching has changed so we can decide
607    whether we can use the cached search results from the previous search */
608 static int is_dir_changed(struct file * file)
609 {
610         struct inode * inode;
611         struct cifsInodeInfo *cifsInfo;
612
613         if(file->f_dentry == NULL)
614                 return 0;
615
616         inode = file->f_dentry->d_inode;
617
618         if(inode == NULL)
619                 return 0;
620
621         cifsInfo = CIFS_I(inode);
622
623         if(cifsInfo->time == 0)
624                 return 1; /* directory was changed, perhaps due to unlink */
625         else
626                 return 0;
627
628 }
629
630 /* find the corresponding entry in the search */
631 /* Note that the SMB server returns search entries for . and .. which
632    complicates logic here if we choose to parse for them and we do not
633    assume that they are located in the findfirst return buffer.*/
634 /* We start counting in the buffer with entry 2 and increment for every
635    entry (do not increment for . or .. entry) */
636 static int find_cifs_entry(const int xid, struct cifsTconInfo *pTcon,
637         struct file *file, char **ppCurrentEntry, int *num_to_ret) 
638 {
639         int rc = 0;
640         int pos_in_buf = 0;
641         loff_t first_entry_in_buffer;
642         loff_t index_to_find = file->f_pos;
643         struct cifsFileInfo * cifsFile = file->private_data;
644         /* check if index in the buffer */
645         
646         if((cifsFile == NULL) || (ppCurrentEntry == NULL) || 
647            (num_to_ret == NULL))
648                 return -ENOENT;
649         
650         *ppCurrentEntry = NULL;
651         first_entry_in_buffer = 
652                 cifsFile->srch_inf.index_of_last_entry - 
653                         cifsFile->srch_inf.entries_in_buffer;
654
655         /* if first entry in buf is zero then is first buffer
656         in search response data which means it is likely . and ..
657         will be in this buffer, although some servers do not return
658         . and .. for the root of a drive and for those we need
659         to start two entries earlier */
660
661 #ifdef CONFIG_CIFS_DEBUG2
662         dump_cifs_file_struct(file, "In fce ");
663 #endif
664         if(((index_to_find < cifsFile->srch_inf.index_of_last_entry) && 
665              is_dir_changed(file)) || 
666            (index_to_find < first_entry_in_buffer)) {
667                 /* close and restart search */
668                 cFYI(1,("search backing up - close and restart search"));
669                 cifsFile->invalidHandle = TRUE;
670                 CIFSFindClose(xid, pTcon, cifsFile->netfid);
671                 kfree(cifsFile->search_resume_name);
672                 cifsFile->search_resume_name = NULL;
673                 if(cifsFile->srch_inf.ntwrk_buf_start) {
674                         cFYI(1,("freeing SMB ff cache buf on search rewind"));
675                         if(cifsFile->srch_inf.smallBuf)
676                                 cifs_small_buf_release(cifsFile->srch_inf.
677                                                 ntwrk_buf_start);
678                         else
679                                 cifs_buf_release(cifsFile->srch_inf.
680                                                 ntwrk_buf_start);
681                 }
682                 rc = initiate_cifs_search(xid,file);
683                 if(rc) {
684                         cFYI(1,("error %d reinitiating a search on rewind",rc));
685                         return rc;
686                 }
687         }
688
689         while((index_to_find >= cifsFile->srch_inf.index_of_last_entry) && 
690               (rc == 0) && (cifsFile->srch_inf.endOfSearch == FALSE)){
691                 cFYI(1,("calling findnext2"));
692                 rc = CIFSFindNext(xid,pTcon,cifsFile->netfid, 
693                                   &cifsFile->srch_inf);
694                 if(rc)
695                         return -ENOENT;
696         }
697         if(index_to_find < cifsFile->srch_inf.index_of_last_entry) {
698                 /* we found the buffer that contains the entry */
699                 /* scan and find it */
700                 int i;
701                 char * current_entry;
702                 char * end_of_smb = cifsFile->srch_inf.ntwrk_buf_start + 
703                         smbCalcSize((struct smb_hdr *)
704                                 cifsFile->srch_inf.ntwrk_buf_start);
705
706                 current_entry = cifsFile->srch_inf.srch_entries_start;
707                 first_entry_in_buffer = cifsFile->srch_inf.index_of_last_entry
708                                         - cifsFile->srch_inf.entries_in_buffer;
709                 pos_in_buf = index_to_find - first_entry_in_buffer;
710                 cFYI(1,("found entry - pos_in_buf %d",pos_in_buf));
711
712                 for(i=0;(i<(pos_in_buf)) && (current_entry != NULL);i++) {
713                         /* go entry by entry figuring out which is first */
714                         current_entry = nxt_dir_entry(current_entry,end_of_smb,
715                                                 cifsFile->srch_inf.info_level);
716                 }
717                 if((current_entry == NULL) && (i < pos_in_buf)) {
718                         /* BB fixme - check if we should flag this error */
719                         cERROR(1,("reached end of buf searching for pos in buf"
720                           " %d index to find %lld rc %d",
721                           pos_in_buf,index_to_find,rc));
722                 }
723                 rc = 0;
724                 *ppCurrentEntry = current_entry;
725         } else {
726                 cFYI(1,("index not in buffer - could not findnext into it"));
727                 return 0;
728         }
729
730         if(pos_in_buf >= cifsFile->srch_inf.entries_in_buffer) {
731                 cFYI(1,("can not return entries pos_in_buf beyond last entry"));
732                 *num_to_ret = 0;
733         } else
734                 *num_to_ret = cifsFile->srch_inf.entries_in_buffer - pos_in_buf;
735
736         return rc;
737 }
738
739 /* inode num, inode type and filename returned */
740 static int cifs_get_name_from_search_buf(struct qstr *pqst,
741         char *current_entry, __u16 level, unsigned int unicode,
742         struct cifs_sb_info * cifs_sb, int max_len, ino_t *pinum)
743 {
744         int rc = 0;
745         unsigned int len = 0;
746         char * filename;
747         struct nls_table * nlt = cifs_sb->local_nls;
748
749         *pinum = 0;
750
751         if(level == SMB_FIND_FILE_UNIX) {
752                 FILE_UNIX_INFO * pFindData = (FILE_UNIX_INFO *)current_entry;
753
754                 filename = &pFindData->FileName[0];
755                 if(unicode) {
756                         len = cifs_unicode_bytelen(filename);
757                 } else {
758                         /* BB should we make this strnlen of PATH_MAX? */
759                         len = strnlen(filename, PATH_MAX);
760                 }
761
762                 /* BB fixme - hash low and high 32 bits if not 64 bit arch BB fixme */
763                 if(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM)
764                         *pinum = pFindData->UniqueId;
765         } else if(level == SMB_FIND_FILE_DIRECTORY_INFO) {
766                 FILE_DIRECTORY_INFO * pFindData = 
767                         (FILE_DIRECTORY_INFO *)current_entry;
768                 filename = &pFindData->FileName[0];
769                 len = le32_to_cpu(pFindData->FileNameLength);
770         } else if(level == SMB_FIND_FILE_FULL_DIRECTORY_INFO) {
771                 FILE_FULL_DIRECTORY_INFO * pFindData = 
772                         (FILE_FULL_DIRECTORY_INFO *)current_entry;
773                 filename = &pFindData->FileName[0];
774                 len = le32_to_cpu(pFindData->FileNameLength);
775         } else if(level == SMB_FIND_FILE_ID_FULL_DIR_INFO) {
776                 SEARCH_ID_FULL_DIR_INFO * pFindData = 
777                         (SEARCH_ID_FULL_DIR_INFO *)current_entry;
778                 filename = &pFindData->FileName[0];
779                 len = le32_to_cpu(pFindData->FileNameLength);
780                 *pinum = pFindData->UniqueId;
781         } else if(level == SMB_FIND_FILE_BOTH_DIRECTORY_INFO) {
782                 FILE_BOTH_DIRECTORY_INFO * pFindData = 
783                         (FILE_BOTH_DIRECTORY_INFO *)current_entry;
784                 filename = &pFindData->FileName[0];
785                 len = le32_to_cpu(pFindData->FileNameLength);
786         } else if(level == SMB_FIND_FILE_INFO_STANDARD) {
787                 FIND_FILE_STANDARD_INFO * pFindData =
788                         (FIND_FILE_STANDARD_INFO *)current_entry;
789                 filename = &pFindData->FileName[0];
790                 /* one byte length, no name conversion */
791                 len = (unsigned int)pFindData->FileNameLength;
792         } else {
793                 cFYI(1,("Unknown findfirst level %d",level));
794                 return -EINVAL;
795         }
796
797         if(len > max_len) {
798                 cERROR(1,("bad search response length %d past smb end", len));
799                 return -EINVAL;
800         }
801
802         if(unicode) {
803                 /* BB fixme - test with long names */
804                 /* Note converted filename can be longer than in unicode */
805                 if(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR)
806                         pqst->len = cifs_convertUCSpath((char *)pqst->name,
807                                         (__le16 *)filename, len/2, nlt);
808                 else
809                         pqst->len = cifs_strfromUCS_le((char *)pqst->name,
810                                         (__le16 *)filename,len/2,nlt);
811         } else {
812                 pqst->name = filename;
813                 pqst->len = len;
814         }
815         pqst->hash = full_name_hash(pqst->name,pqst->len);
816 /*      cFYI(1,("filldir on %s",pqst->name));  */
817         return rc;
818 }
819
820 static int cifs_filldir(char *pfindEntry, struct file *file,
821         filldir_t filldir, void *direntry, char *scratch_buf, int max_len)
822 {
823         int rc = 0;
824         struct qstr qstring;
825         struct cifsFileInfo * pCifsF;
826         unsigned obj_type;
827         ino_t  inum;
828         struct cifs_sb_info * cifs_sb;
829         struct inode *tmp_inode;
830         struct dentry *tmp_dentry;
831
832         /* get filename and len into qstring */
833         /* get dentry */
834         /* decide whether to create and populate ionde */
835         if((direntry == NULL) || (file == NULL))
836                 return -EINVAL;
837
838         pCifsF = file->private_data;
839         
840         if((scratch_buf == NULL) || (pfindEntry == NULL) || (pCifsF == NULL))
841                 return -ENOENT;
842
843         if(file->f_dentry == NULL)
844                 return -ENOENT;
845
846         rc = cifs_entry_is_dot(pfindEntry,pCifsF);
847         /* skip . and .. since we added them first */
848         if(rc != 0) 
849                 return 0;
850
851         cifs_sb = CIFS_SB(file->f_dentry->d_sb);
852
853         qstring.name = scratch_buf;
854         rc = cifs_get_name_from_search_buf(&qstring,pfindEntry,
855                         pCifsF->srch_inf.info_level,
856                         pCifsF->srch_inf.unicode,cifs_sb,
857                         max_len,
858                         &inum /* returned */);
859
860         if(rc)
861                 return rc;
862
863         rc = construct_dentry(&qstring,file,&tmp_inode, &tmp_dentry);
864         if((tmp_inode == NULL) || (tmp_dentry == NULL))
865                 return -ENOMEM;
866
867         if(rc) {
868                 /* inode created, we need to hash it with right inode number */
869                 if(inum != 0) {
870                         /* BB fixme - hash the 2 32 quantities bits together if necessary BB */
871                         tmp_inode->i_ino = inum;
872                 }
873                 insert_inode_hash(tmp_inode);
874         }
875
876         /* we pass in rc below, indicating whether it is a new inode,
877            so we can figure out whether to invalidate the inode cached
878            data if the file has changed */
879         if(pCifsF->srch_inf.info_level == SMB_FIND_FILE_UNIX)
880                 unix_fill_in_inode(tmp_inode,
881                                    (FILE_UNIX_INFO *)pfindEntry,
882                                    &obj_type, rc);
883         else if(pCifsF->srch_inf.info_level == SMB_FIND_FILE_INFO_STANDARD)
884                 fill_in_inode(tmp_inode, 0 /* old level 1 buffer type */,
885                                 pfindEntry, &obj_type, rc);
886         else
887                 fill_in_inode(tmp_inode, 1 /* NT */, pfindEntry, &obj_type, rc);
888
889         if(rc) /* new inode - needs to be tied to dentry */ {
890                 d_instantiate(tmp_dentry, tmp_inode);
891                 if(rc == 2)
892                         d_rehash(tmp_dentry);
893         }
894         
895         
896         rc = filldir(direntry,qstring.name,qstring.len,file->f_pos,
897                      tmp_inode->i_ino,obj_type);
898         if(rc) {
899                 cFYI(1,("filldir rc = %d",rc));
900         }
901
902         dput(tmp_dentry);
903         return rc;
904 }
905
906 static int cifs_save_resume_key(const char *current_entry,
907         struct cifsFileInfo *cifsFile)
908 {
909         int rc = 0;
910         unsigned int len = 0;
911         __u16 level;
912         char * filename;
913
914         if((cifsFile == NULL) || (current_entry == NULL))
915                 return -EINVAL;
916
917         level = cifsFile->srch_inf.info_level;
918
919         if(level == SMB_FIND_FILE_UNIX) {
920                 FILE_UNIX_INFO * pFindData = (FILE_UNIX_INFO *)current_entry;
921
922                 filename = &pFindData->FileName[0];
923                 if(cifsFile->srch_inf.unicode) {
924                         len = cifs_unicode_bytelen(filename);
925                 } else {
926                         /* BB should we make this strnlen of PATH_MAX? */
927                         len = strnlen(filename, PATH_MAX);
928                 }
929                 cifsFile->srch_inf.resume_key = pFindData->ResumeKey;
930         } else if(level == SMB_FIND_FILE_DIRECTORY_INFO) {
931                 FILE_DIRECTORY_INFO * pFindData = 
932                         (FILE_DIRECTORY_INFO *)current_entry;
933                 filename = &pFindData->FileName[0];
934                 len = le32_to_cpu(pFindData->FileNameLength);
935                 cifsFile->srch_inf.resume_key = pFindData->FileIndex;
936         } else if(level == SMB_FIND_FILE_FULL_DIRECTORY_INFO) {
937                 FILE_FULL_DIRECTORY_INFO * pFindData = 
938                         (FILE_FULL_DIRECTORY_INFO *)current_entry;
939                 filename = &pFindData->FileName[0];
940                 len = le32_to_cpu(pFindData->FileNameLength);
941                 cifsFile->srch_inf.resume_key = pFindData->FileIndex;
942         } else if(level == SMB_FIND_FILE_ID_FULL_DIR_INFO) {
943                 SEARCH_ID_FULL_DIR_INFO * pFindData = 
944                         (SEARCH_ID_FULL_DIR_INFO *)current_entry;
945                 filename = &pFindData->FileName[0];
946                 len = le32_to_cpu(pFindData->FileNameLength);
947                 cifsFile->srch_inf.resume_key = pFindData->FileIndex;
948         } else if(level == SMB_FIND_FILE_BOTH_DIRECTORY_INFO) {
949                 FILE_BOTH_DIRECTORY_INFO * pFindData = 
950                         (FILE_BOTH_DIRECTORY_INFO *)current_entry;
951                 filename = &pFindData->FileName[0];
952                 len = le32_to_cpu(pFindData->FileNameLength);
953                 cifsFile->srch_inf.resume_key = pFindData->FileIndex;
954         } else if(level == SMB_FIND_FILE_INFO_STANDARD) {
955                 FIND_FILE_STANDARD_INFO * pFindData =
956                         (FIND_FILE_STANDARD_INFO *)current_entry;
957                 filename = &pFindData->FileName[0];
958                 /* one byte length, no name conversion */
959                 len = (unsigned int)pFindData->FileNameLength;
960                 cifsFile->srch_inf.resume_key = pFindData->ResumeKey;
961         } else {
962                 cFYI(1,("Unknown findfirst level %d",level));
963                 return -EINVAL;
964         }
965         cifsFile->srch_inf.resume_name_len = len;
966         cifsFile->srch_inf.presume_name = filename;
967         return rc;
968 }
969
970 int cifs_readdir(struct file *file, void *direntry, filldir_t filldir)
971 {
972         int rc = 0;
973         int xid,i;
974         struct cifs_sb_info *cifs_sb;
975         struct cifsTconInfo *pTcon;
976         struct cifsFileInfo *cifsFile = NULL;
977         char * current_entry;
978         int num_to_fill = 0;
979         char * tmp_buf = NULL;
980         char * end_of_smb;
981         int max_len;
982
983         xid = GetXid();
984
985         if(file->f_dentry == NULL) {
986                 FreeXid(xid);
987                 return -EIO;
988         }
989
990         cifs_sb = CIFS_SB(file->f_dentry->d_sb);
991         pTcon = cifs_sb->tcon;
992         if(pTcon == NULL)
993                 return -EINVAL;
994
995         switch ((int) file->f_pos) {
996         case 0:
997                 if (filldir(direntry, ".", 1, file->f_pos,
998                      file->f_dentry->d_inode->i_ino, DT_DIR) < 0) {
999                         cERROR(1, ("Filldir for current dir failed"));
1000                         rc = -ENOMEM;
1001                         break;
1002                 }
1003                 file->f_pos++;
1004         case 1:
1005                 if (filldir(direntry, "..", 2, file->f_pos,
1006                      file->f_dentry->d_parent->d_inode->i_ino, DT_DIR) < 0) {
1007                         cERROR(1, ("Filldir for parent dir failed"));
1008                         rc = -ENOMEM;
1009                         break;
1010                 }
1011                 file->f_pos++;
1012         default:
1013                 /* 1) If search is active, 
1014                         is in current search buffer? 
1015                         if it before then restart search
1016                         if after then keep searching till find it */
1017
1018                 if(file->private_data == NULL) {
1019                         rc = initiate_cifs_search(xid,file);
1020                         cFYI(1,("initiate cifs search rc %d",rc));
1021                         if(rc) {
1022                                 FreeXid(xid);
1023                                 return rc;
1024                         }
1025                 }
1026                 if(file->private_data == NULL) {
1027                         rc = -EINVAL;
1028                         FreeXid(xid);
1029                         return rc;
1030                 }
1031                 cifsFile = file->private_data;
1032                 if (cifsFile->srch_inf.endOfSearch) {
1033                         if(cifsFile->srch_inf.emptyDir) {
1034                                 cFYI(1, ("End of search, empty dir"));
1035                                 rc = 0;
1036                                 break;
1037                         }
1038                 } /* else {
1039                         cifsFile->invalidHandle = TRUE;
1040                         CIFSFindClose(xid, pTcon, cifsFile->netfid);
1041                 } 
1042                 kfree(cifsFile->search_resume_name);
1043                 cifsFile->search_resume_name = NULL; */
1044
1045                 rc = find_cifs_entry(xid,pTcon, file,
1046                                 &current_entry,&num_to_fill);
1047                 if(rc) {
1048                         cFYI(1,("fce error %d",rc)); 
1049                         goto rddir2_exit;
1050                 } else if (current_entry != NULL) {
1051                         cFYI(1,("entry %lld found",file->f_pos));
1052                 } else {
1053                         cFYI(1,("could not find entry"));
1054                         goto rddir2_exit;
1055                 }
1056                 cFYI(1,("loop through %d times filling dir for net buf %p",
1057                         num_to_fill,cifsFile->srch_inf.ntwrk_buf_start));
1058                 max_len = smbCalcSize((struct smb_hdr *)
1059                                 cifsFile->srch_inf.ntwrk_buf_start);
1060                 end_of_smb = cifsFile->srch_inf.ntwrk_buf_start + max_len;
1061
1062                 /* To be safe - for UCS to UTF-8 with strings loaded
1063                 with the rare long characters alloc more to account for
1064                 such multibyte target UTF-8 characters. cifs_unicode.c,
1065                 which actually does the conversion, has the same limit */
1066                 tmp_buf = kmalloc((2 * NAME_MAX) + 4, GFP_KERNEL);
1067                 for(i=0;(i<num_to_fill) && (rc == 0);i++) {
1068                         if(current_entry == NULL) {
1069                                 /* evaluate whether this case is an error */
1070                                 cERROR(1,("past end of SMB num to fill %d i %d",
1071                                           num_to_fill, i));
1072                                 break;
1073                         }
1074                         /* if buggy server returns . and .. late do
1075                         we want to check for that here? */
1076                         rc = cifs_filldir(current_entry, file,
1077                                         filldir, direntry, tmp_buf, max_len);
1078                         file->f_pos++;
1079                         if(file->f_pos == 
1080                                 cifsFile->srch_inf.index_of_last_entry) {
1081                                 cFYI(1,("last entry in buf at pos %lld %s",
1082                                         file->f_pos,tmp_buf));
1083                                 cifs_save_resume_key(current_entry,cifsFile);
1084                                 break;
1085                         } else 
1086                                 current_entry = 
1087                                         nxt_dir_entry(current_entry, end_of_smb,
1088                                                 cifsFile->srch_inf.info_level);
1089                 }
1090                 kfree(tmp_buf);
1091                 break;
1092         } /* end switch */
1093
1094 rddir2_exit:
1095         FreeXid(xid);
1096         return rc;
1097 }