Merge with /pub/scm/linux/kernel/git/torvalds/linux-2.6.git
[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/stat.h>
25 #include <linux/smp_lock.h>
26 #include "cifspdu.h"
27 #include "cifsglob.h"
28 #include "cifsproto.h"
29 #include "cifs_unicode.h"
30 #include "cifs_debug.h"
31 #include "cifs_fs_sb.h"
32 #include "cifsfs.h"
33
34 /* BB fixme - add debug wrappers around this function to disable it fixme BB */
35 /* static void dump_cifs_file_struct(struct file *file, char *label)
36 {
37         struct cifsFileInfo * cf;
38
39         if(file) {
40                 cf = file->private_data;
41                 if(cf == NULL) {
42                         cFYI(1,("empty cifs private file data"));
43                         return;
44                 }
45                 if(cf->invalidHandle) {
46                         cFYI(1,("invalid handle"));
47                 }
48                 if(cf->srch_inf.endOfSearch) {
49                         cFYI(1,("end of search"));
50                 }
51                 if(cf->srch_inf.emptyDir) {
52                         cFYI(1,("empty dir"));
53                 }
54                 
55         }
56 } */
57
58 /* Returns one if new inode created (which therefore needs to be hashed) */
59 /* Might check in the future if inode number changed so we can rehash inode */
60 static int construct_dentry(struct qstr *qstring, struct file *file,
61         struct inode **ptmp_inode, struct dentry **pnew_dentry)
62 {
63         struct dentry *tmp_dentry;
64         struct cifs_sb_info *cifs_sb;
65         struct cifsTconInfo *pTcon;
66         int rc = 0;
67
68         cFYI(1, ("For %s", qstring->name));
69         cifs_sb = CIFS_SB(file->f_dentry->d_sb);
70         pTcon = cifs_sb->tcon;
71
72         qstring->hash = full_name_hash(qstring->name, qstring->len);
73         tmp_dentry = d_lookup(file->f_dentry, qstring);
74         if (tmp_dentry) {
75                 cFYI(0, ("existing dentry with inode 0x%p", tmp_dentry->d_inode));
76                 *ptmp_inode = tmp_dentry->d_inode;
77 /* BB overwrite old name? i.e. tmp_dentry->d_name and tmp_dentry->d_name.len??*/
78                 if(*ptmp_inode == NULL) {
79                         *ptmp_inode = new_inode(file->f_dentry->d_sb);
80                         if(*ptmp_inode == NULL)
81                                 return rc;
82                         rc = 1;
83                         d_instantiate(tmp_dentry, *ptmp_inode);
84                 }
85         } else {
86                 tmp_dentry = d_alloc(file->f_dentry, qstring);
87                 if(tmp_dentry == NULL) {
88                         cERROR(1,("Failed allocating dentry"));
89                         *ptmp_inode = NULL;
90                         return rc;
91                 }
92
93                 *ptmp_inode = new_inode(file->f_dentry->d_sb);
94                 if (pTcon->nocase)
95                         tmp_dentry->d_op = &cifs_ci_dentry_ops;
96                 else
97                         tmp_dentry->d_op = &cifs_dentry_ops;
98                 if(*ptmp_inode == NULL)
99                         return rc;
100                 rc = 1;
101                 d_instantiate(tmp_dentry, *ptmp_inode);
102                 d_rehash(tmp_dentry);
103         }
104
105         tmp_dentry->d_time = jiffies;
106         *pnew_dentry = tmp_dentry;
107         return rc;
108 }
109
110 static void fill_in_inode(struct inode *tmp_inode,
111         FILE_DIRECTORY_INFO *pfindData, int *pobject_type, int isNewInode)
112 {
113         loff_t local_size;
114         struct timespec local_mtime;
115
116         struct cifsInodeInfo *cifsInfo = CIFS_I(tmp_inode);
117         struct cifs_sb_info *cifs_sb = CIFS_SB(tmp_inode->i_sb);
118         __u32 attr = le32_to_cpu(pfindData->ExtFileAttributes);
119         __u64 allocation_size = le64_to_cpu(pfindData->AllocationSize);
120         __u64 end_of_file = le64_to_cpu(pfindData->EndOfFile);
121
122         cifsInfo->cifsAttrs = attr;
123         cifsInfo->time = jiffies;
124
125         /* save mtime and size */
126         local_mtime = tmp_inode->i_mtime;
127         local_size  = tmp_inode->i_size;
128
129         /* Linux can not store file creation time unfortunately so ignore it */
130         tmp_inode->i_atime =
131             cifs_NTtimeToUnix(le64_to_cpu(pfindData->LastAccessTime));
132         tmp_inode->i_mtime =
133             cifs_NTtimeToUnix(le64_to_cpu(pfindData->LastWriteTime));
134         tmp_inode->i_ctime =
135             cifs_NTtimeToUnix(le64_to_cpu(pfindData->ChangeTime));
136         /* treat dos attribute of read-only as read-only mode bit e.g. 555? */
137         /* 2767 perms - indicate mandatory locking */
138                 /* BB fill in uid and gid here? with help from winbind? 
139                    or retrieve from NTFS stream extended attribute */
140         if (atomic_read(&cifsInfo->inUse) == 0) {
141                 tmp_inode->i_uid = cifs_sb->mnt_uid;
142                 tmp_inode->i_gid = cifs_sb->mnt_gid;
143                 /* set default mode. will override for dirs below */
144                 tmp_inode->i_mode = cifs_sb->mnt_file_mode;
145         } else {
146                 /* mask off the type bits since it gets set
147                 below and we do not want to get two type
148                 bits set */
149                 tmp_inode->i_mode &= ~S_IFMT;
150         }
151
152         if (attr & ATTR_DIRECTORY) {
153                 *pobject_type = DT_DIR;
154                 /* override default perms since we do not lock dirs */
155                 if(atomic_read(&cifsInfo->inUse) == 0) {
156                         tmp_inode->i_mode = cifs_sb->mnt_dir_mode;
157                 }
158                 tmp_inode->i_mode |= S_IFDIR;
159         } else if ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_UNX_EMUL) && 
160                    (attr & ATTR_SYSTEM)) {
161                 if (end_of_file == 0)  {
162                         *pobject_type = DT_FIFO;
163                         tmp_inode->i_mode |= S_IFIFO;
164                 } else {
165                         /* rather than get the type here, we mark the
166                         inode as needing revalidate and get the real type
167                         (blk vs chr vs. symlink) later ie in lookup */
168                         *pobject_type = DT_REG;
169                         tmp_inode->i_mode |= S_IFREG; 
170                         cifsInfo->time = 0;     
171                 }
172 /* we no longer mark these because we could not follow them */
173 /*        } else if (attr & ATTR_REPARSE) {
174                 *pobject_type = DT_LNK;
175                 tmp_inode->i_mode |= S_IFLNK; */
176         } else {
177                 *pobject_type = DT_REG;
178                 tmp_inode->i_mode |= S_IFREG;
179                 if (attr & ATTR_READONLY)
180                         tmp_inode->i_mode &= ~(S_IWUGO);
181         } /* could add code here - to validate if device or weird share type? */
182
183         /* can not fill in nlink here as in qpathinfo version and Unx search */
184         if (atomic_read(&cifsInfo->inUse) == 0) {
185                 atomic_set(&cifsInfo->inUse, 1);
186         }
187
188         if (is_size_safe_to_change(cifsInfo)) {
189                 /* can not safely change the file size here if the 
190                 client is writing to it due to potential races */
191                 i_size_write(tmp_inode, end_of_file);
192
193         /* 512 bytes (2**9) is the fake blocksize that must be used */
194         /* for this calculation, even though the reported blocksize is larger */
195                 tmp_inode->i_blocks = (512 - 1 + allocation_size) >> 9;
196         }
197
198         if (allocation_size < end_of_file)
199                 cFYI(1, ("May be sparse file, allocation less than file size"));
200         cFYI(1, ("File Size %ld and blocks %llu and blocksize %ld",
201                 (unsigned long)tmp_inode->i_size,
202                 (unsigned long long)tmp_inode->i_blocks,
203                 tmp_inode->i_blksize));
204         if (S_ISREG(tmp_inode->i_mode)) {
205                 cFYI(1, ("File inode"));
206                 tmp_inode->i_op = &cifs_file_inode_ops;
207                 if(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DIRECT_IO) {
208                         if(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_BRL)
209                                 tmp_inode->i_fop = &cifs_file_direct_nobrl_ops;
210                         else
211                                 tmp_inode->i_fop = &cifs_file_direct_ops;
212                 
213                 } else if(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_BRL)
214                         tmp_inode->i_fop = &cifs_file_nobrl_ops;
215                 else
216                         tmp_inode->i_fop = &cifs_file_ops;
217
218                 tmp_inode->i_data.a_ops = &cifs_addr_ops;
219                 if((cifs_sb->tcon) && (cifs_sb->tcon->ses) &&
220                    (cifs_sb->tcon->ses->server->maxBuf <
221                         4096 + MAX_CIFS_HDR_SIZE))
222                         tmp_inode->i_data.a_ops->readpages = NULL;
223                 if(isNewInode)
224                         return; /* No sense invalidating pages for new inode
225                                    since have not started caching readahead file
226                                    data yet */
227
228                 if (timespec_equal(&tmp_inode->i_mtime, &local_mtime) &&
229                         (local_size == tmp_inode->i_size)) {
230                         cFYI(1, ("inode exists but unchanged"));
231                 } else {
232                         /* file may have changed on server */
233                         cFYI(1, ("invalidate inode, readdir detected change"));
234                         invalidate_remote_inode(tmp_inode);
235                 }
236         } else if (S_ISDIR(tmp_inode->i_mode)) {
237                 cFYI(1, ("Directory inode"));
238                 tmp_inode->i_op = &cifs_dir_inode_ops;
239                 tmp_inode->i_fop = &cifs_dir_ops;
240         } else if (S_ISLNK(tmp_inode->i_mode)) {
241                 cFYI(1, ("Symbolic Link inode"));
242                 tmp_inode->i_op = &cifs_symlink_inode_ops;
243         } else {
244                 cFYI(1, ("Init special inode"));
245                 init_special_inode(tmp_inode, tmp_inode->i_mode,
246                                    tmp_inode->i_rdev);
247         }
248 }
249
250 static void unix_fill_in_inode(struct inode *tmp_inode,
251         FILE_UNIX_INFO *pfindData, int *pobject_type, int isNewInode)
252 {
253         loff_t local_size;
254         struct timespec local_mtime;
255
256         struct cifsInodeInfo *cifsInfo = CIFS_I(tmp_inode);
257         struct cifs_sb_info *cifs_sb = CIFS_SB(tmp_inode->i_sb);
258
259         __u32 type = le32_to_cpu(pfindData->Type);
260         __u64 num_of_bytes = le64_to_cpu(pfindData->NumOfBytes);
261         __u64 end_of_file = le64_to_cpu(pfindData->EndOfFile);
262         cifsInfo->time = jiffies;
263         atomic_inc(&cifsInfo->inUse);
264
265         /* save mtime and size */
266         local_mtime = tmp_inode->i_mtime;
267         local_size  = tmp_inode->i_size;
268
269         tmp_inode->i_atime =
270             cifs_NTtimeToUnix(le64_to_cpu(pfindData->LastAccessTime));
271         tmp_inode->i_mtime =
272             cifs_NTtimeToUnix(le64_to_cpu(pfindData->LastModificationTime));
273         tmp_inode->i_ctime =
274             cifs_NTtimeToUnix(le64_to_cpu(pfindData->LastStatusChange));
275
276         tmp_inode->i_mode = le64_to_cpu(pfindData->Permissions);
277         /* since we set the inode type below we need to mask off type
278            to avoid strange results if bits above were corrupt */
279         tmp_inode->i_mode &= ~S_IFMT;
280         if (type == UNIX_FILE) {
281                 *pobject_type = DT_REG;
282                 tmp_inode->i_mode |= S_IFREG;
283         } else if (type == UNIX_SYMLINK) {
284                 *pobject_type = DT_LNK;
285                 tmp_inode->i_mode |= S_IFLNK;
286         } else if (type == UNIX_DIR) {
287                 *pobject_type = DT_DIR;
288                 tmp_inode->i_mode |= S_IFDIR;
289         } else if (type == UNIX_CHARDEV) {
290                 *pobject_type = DT_CHR;
291                 tmp_inode->i_mode |= S_IFCHR;
292                 tmp_inode->i_rdev = MKDEV(le64_to_cpu(pfindData->DevMajor),
293                                 le64_to_cpu(pfindData->DevMinor) & MINORMASK);
294         } else if (type == UNIX_BLOCKDEV) {
295                 *pobject_type = DT_BLK;
296                 tmp_inode->i_mode |= S_IFBLK;
297                 tmp_inode->i_rdev = MKDEV(le64_to_cpu(pfindData->DevMajor),
298                                 le64_to_cpu(pfindData->DevMinor) & MINORMASK);
299         } else if (type == UNIX_FIFO) {
300                 *pobject_type = DT_FIFO;
301                 tmp_inode->i_mode |= S_IFIFO;
302         } else if (type == UNIX_SOCKET) {
303                 *pobject_type = DT_SOCK;
304                 tmp_inode->i_mode |= S_IFSOCK;
305         } else {
306                 /* safest to just call it a file */
307                 *pobject_type = DT_REG;
308                 tmp_inode->i_mode |= S_IFREG;
309                 cFYI(1,("unknown inode type %d",type)); 
310         }
311
312         tmp_inode->i_uid = le64_to_cpu(pfindData->Uid);
313         tmp_inode->i_gid = le64_to_cpu(pfindData->Gid);
314         tmp_inode->i_nlink = le64_to_cpu(pfindData->Nlinks);
315
316         if (is_size_safe_to_change(cifsInfo)) {
317                 /* can not safely change the file size here if the 
318                 client is writing to it due to potential races */
319                 i_size_write(tmp_inode,end_of_file);
320
321         /* 512 bytes (2**9) is the fake blocksize that must be used */
322         /* for this calculation, not the real blocksize */
323                 tmp_inode->i_blocks = (512 - 1 + num_of_bytes) >> 9;
324         }
325
326         if (S_ISREG(tmp_inode->i_mode)) {
327                 cFYI(1, ("File inode"));
328                 tmp_inode->i_op = &cifs_file_inode_ops;
329
330                 if(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DIRECT_IO) {
331                         if(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_BRL)
332                                 tmp_inode->i_fop = &cifs_file_direct_nobrl_ops;
333                         else
334                                 tmp_inode->i_fop = &cifs_file_direct_ops;
335                 
336                 } else if(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_BRL)
337                         tmp_inode->i_fop = &cifs_file_nobrl_ops;
338                 else
339                         tmp_inode->i_fop = &cifs_file_ops;
340
341                 tmp_inode->i_data.a_ops = &cifs_addr_ops;
342                 if((cifs_sb->tcon) && (cifs_sb->tcon->ses) &&
343                    (cifs_sb->tcon->ses->server->maxBuf < 
344                         4096 + MAX_CIFS_HDR_SIZE))
345                         tmp_inode->i_data.a_ops->readpages = NULL;
346
347                 if(isNewInode)
348                         return; /* No sense invalidating pages for new inode since we
349                                            have not started caching readahead file data yet */
350
351                 if (timespec_equal(&tmp_inode->i_mtime, &local_mtime) &&
352                         (local_size == tmp_inode->i_size)) {
353                         cFYI(1, ("inode exists but unchanged"));
354                 } else {
355                         /* file may have changed on server */
356                         cFYI(1, ("invalidate inode, readdir detected change"));
357                         invalidate_remote_inode(tmp_inode);
358                 }
359         } else if (S_ISDIR(tmp_inode->i_mode)) {
360                 cFYI(1, ("Directory inode"));
361                 tmp_inode->i_op = &cifs_dir_inode_ops;
362                 tmp_inode->i_fop = &cifs_dir_ops;
363         } else if (S_ISLNK(tmp_inode->i_mode)) {
364                 cFYI(1, ("Symbolic Link inode"));
365                 tmp_inode->i_op = &cifs_symlink_inode_ops;
366 /* tmp_inode->i_fop = *//* do not need to set to anything */
367         } else {
368                 cFYI(1, ("Special inode")); 
369                 init_special_inode(tmp_inode, tmp_inode->i_mode,
370                                    tmp_inode->i_rdev);
371         }
372 }
373
374 static int initiate_cifs_search(const int xid, struct file *file)
375 {
376         int rc = 0;
377         char * full_path;
378         struct cifsFileInfo * cifsFile;
379         struct cifs_sb_info *cifs_sb;
380         struct cifsTconInfo *pTcon;
381
382         if(file->private_data == NULL) {
383                 file->private_data = 
384                         kmalloc(sizeof(struct cifsFileInfo),GFP_KERNEL);
385         }
386
387         if(file->private_data == NULL) {
388                 return -ENOMEM;
389         } else {
390                 memset(file->private_data,0,sizeof(struct cifsFileInfo));
391         }
392         cifsFile = file->private_data;
393         cifsFile->invalidHandle = TRUE;
394         cifsFile->srch_inf.endOfSearch = FALSE;
395
396         if(file->f_dentry == NULL)
397                 return -ENOENT;
398
399         cifs_sb = CIFS_SB(file->f_dentry->d_sb);
400         if(cifs_sb == NULL)
401                 return -EINVAL;
402
403         pTcon = cifs_sb->tcon;
404         if(pTcon == NULL)
405                 return -EINVAL;
406
407         mutex_lock(&file->f_dentry->d_sb->s_vfs_rename_mutex);
408         full_path = build_path_from_dentry(file->f_dentry);
409         mutex_unlock(&file->f_dentry->d_sb->s_vfs_rename_mutex);
410
411         if(full_path == NULL) {
412                 return -ENOMEM;
413         }
414
415         cFYI(1, ("Full path: %s start at: %lld", full_path, file->f_pos));
416
417 ffirst_retry:
418         /* test for Unix extensions */
419         if (pTcon->ses->capabilities & CAP_UNIX) {
420                 cifsFile->srch_inf.info_level = SMB_FIND_FILE_UNIX; 
421         } else if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM) {
422                 cifsFile->srch_inf.info_level = SMB_FIND_FILE_ID_FULL_DIR_INFO;
423         } else /* not srvinos - BB fixme add check for backlevel? */ {
424                 cifsFile->srch_inf.info_level = SMB_FIND_FILE_DIRECTORY_INFO;
425         }
426
427         rc = CIFSFindFirst(xid, pTcon,full_path,cifs_sb->local_nls,
428                 &cifsFile->netfid, &cifsFile->srch_inf,
429                 cifs_sb->mnt_cifs_flags & 
430                         CIFS_MOUNT_MAP_SPECIAL_CHR, CIFS_DIR_SEP(cifs_sb));
431         if(rc == 0)
432                 cifsFile->invalidHandle = FALSE;
433         if((rc == -EOPNOTSUPP) && 
434                 (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM)) {
435                 cifs_sb->mnt_cifs_flags &= ~CIFS_MOUNT_SERVER_INUM;
436                 goto ffirst_retry;
437         }
438         kfree(full_path);
439         return rc;
440 }
441
442 /* return length of unicode string in bytes */
443 static int cifs_unicode_bytelen(char *str)
444 {
445         int len;
446         __le16 * ustr = (__le16 *)str;
447
448         for(len=0;len <= PATH_MAX;len++) {
449                 if(ustr[len] == 0)
450                         return len << 1;
451         }
452         cFYI(1,("Unicode string longer than PATH_MAX found"));
453         return len << 1;
454 }
455
456 static char *nxt_dir_entry(char *old_entry, char *end_of_smb)
457 {
458         char * new_entry;
459         FILE_DIRECTORY_INFO * pDirInfo = (FILE_DIRECTORY_INFO *)old_entry;
460
461         new_entry = old_entry + le32_to_cpu(pDirInfo->NextEntryOffset);
462         cFYI(1,("new entry %p old entry %p",new_entry,old_entry));
463         /* validate that new_entry is not past end of SMB */
464         if(new_entry >= end_of_smb) {
465                 cERROR(1,
466                       ("search entry %p began after end of SMB %p old entry %p",
467                         new_entry, end_of_smb, old_entry)); 
468                 return NULL;
469         } else if (new_entry + sizeof(FILE_DIRECTORY_INFO) > end_of_smb) {
470                 cERROR(1,("search entry %p extends after end of SMB %p",
471                         new_entry, end_of_smb));
472                 return NULL;
473         } else 
474                 return new_entry;
475
476 }
477
478 #define UNICODE_DOT cpu_to_le16(0x2e)
479
480 /* return 0 if no match and 1 for . (current directory) and 2 for .. (parent) */
481 static int cifs_entry_is_dot(char *current_entry, struct cifsFileInfo *cfile)
482 {
483         int rc = 0;
484         char * filename = NULL;
485         int len = 0; 
486
487         if(cfile->srch_inf.info_level == 0x202) {
488                 FILE_UNIX_INFO * pFindData = (FILE_UNIX_INFO *)current_entry;
489                 filename = &pFindData->FileName[0];
490                 if(cfile->srch_inf.unicode) {
491                         len = cifs_unicode_bytelen(filename);
492                 } else {
493                         /* BB should we make this strnlen of PATH_MAX? */
494                         len = strnlen(filename, 5);
495                 }
496         } else if(cfile->srch_inf.info_level == 0x101) {
497                 FILE_DIRECTORY_INFO * pFindData = 
498                         (FILE_DIRECTORY_INFO *)current_entry;
499                 filename = &pFindData->FileName[0];
500                 len = le32_to_cpu(pFindData->FileNameLength);
501         } else if(cfile->srch_inf.info_level == 0x102) {
502                 FILE_FULL_DIRECTORY_INFO * pFindData = 
503                         (FILE_FULL_DIRECTORY_INFO *)current_entry;
504                 filename = &pFindData->FileName[0];
505                 len = le32_to_cpu(pFindData->FileNameLength);
506         } else if(cfile->srch_inf.info_level == 0x105) {
507                 SEARCH_ID_FULL_DIR_INFO * pFindData = 
508                         (SEARCH_ID_FULL_DIR_INFO *)current_entry;
509                 filename = &pFindData->FileName[0];
510                 len = le32_to_cpu(pFindData->FileNameLength);
511         } else if(cfile->srch_inf.info_level == 0x104) {
512                 FILE_BOTH_DIRECTORY_INFO * pFindData = 
513                         (FILE_BOTH_DIRECTORY_INFO *)current_entry;
514                 filename = &pFindData->FileName[0];
515                 len = le32_to_cpu(pFindData->FileNameLength);
516         } else {
517                 cFYI(1,("Unknown findfirst level %d",cfile->srch_inf.info_level));
518         }
519
520         if(filename) {
521                 if(cfile->srch_inf.unicode) {
522                         __le16 *ufilename = (__le16 *)filename;
523                         if(len == 2) {
524                                 /* check for . */
525                                 if(ufilename[0] == UNICODE_DOT)
526                                         rc = 1;
527                         } else if(len == 4) {
528                                 /* check for .. */
529                                 if((ufilename[0] == UNICODE_DOT)
530                                    &&(ufilename[1] == UNICODE_DOT))
531                                         rc = 2;
532                         }
533                 } else /* ASCII */ {
534                         if(len == 1) {
535                                 if(filename[0] == '.') 
536                                         rc = 1;
537                         } else if(len == 2) {
538                                 if((filename[0] == '.') && (filename[1] == '.')) 
539                                         rc = 2;
540                         }
541                 }
542         }
543
544         return rc;
545 }
546
547 /* Check if directory that we are searching has changed so we can decide
548    whether we can use the cached search results from the previous search */
549 static int is_dir_changed(struct file * file)
550 {
551         struct inode * inode;
552         struct cifsInodeInfo *cifsInfo;
553
554         if(file->f_dentry == NULL)
555                 return 0;
556
557         inode = file->f_dentry->d_inode;
558
559         if(inode == NULL)
560                 return 0;
561
562         cifsInfo = CIFS_I(inode);
563
564         if(cifsInfo->time == 0)
565                 return 1; /* directory was changed, perhaps due to unlink */
566         else
567                 return 0;
568
569 }
570
571 /* find the corresponding entry in the search */
572 /* Note that the SMB server returns search entries for . and .. which
573    complicates logic here if we choose to parse for them and we do not
574    assume that they are located in the findfirst return buffer.*/
575 /* We start counting in the buffer with entry 2 and increment for every
576    entry (do not increment for . or .. entry) */
577 static int find_cifs_entry(const int xid, struct cifsTconInfo *pTcon,
578         struct file *file, char **ppCurrentEntry, int *num_to_ret) 
579 {
580         int rc = 0;
581         int pos_in_buf = 0;
582         loff_t first_entry_in_buffer;
583         loff_t index_to_find = file->f_pos;
584         struct cifsFileInfo * cifsFile = file->private_data;
585         /* check if index in the buffer */
586         
587         if((cifsFile == NULL) || (ppCurrentEntry == NULL) || 
588            (num_to_ret == NULL))
589                 return -ENOENT;
590         
591         *ppCurrentEntry = NULL;
592         first_entry_in_buffer = 
593                 cifsFile->srch_inf.index_of_last_entry - 
594                         cifsFile->srch_inf.entries_in_buffer;
595 /*      dump_cifs_file_struct(file, "In fce ");*/
596         if(((index_to_find < cifsFile->srch_inf.index_of_last_entry) && 
597              is_dir_changed(file)) || 
598            (index_to_find < first_entry_in_buffer)) {
599                 /* close and restart search */
600                 cFYI(1,("search backing up - close and restart search"));
601                 cifsFile->invalidHandle = TRUE;
602                 CIFSFindClose(xid, pTcon, cifsFile->netfid);
603                 kfree(cifsFile->search_resume_name);
604                 cifsFile->search_resume_name = NULL;
605                 if(cifsFile->srch_inf.ntwrk_buf_start) {
606                         cFYI(1,("freeing SMB ff cache buf on search rewind"));
607                         if(cifsFile->srch_inf.smallBuf)
608                                 cifs_small_buf_release(cifsFile->srch_inf.
609                                                 ntwrk_buf_start);
610                         else
611                                 cifs_buf_release(cifsFile->srch_inf.
612                                                 ntwrk_buf_start);
613                 }
614                 rc = initiate_cifs_search(xid,file);
615                 if(rc) {
616                         cFYI(1,("error %d reinitiating a search on rewind",rc));
617                         return rc;
618                 }
619         }
620
621         while((index_to_find >= cifsFile->srch_inf.index_of_last_entry) && 
622               (rc == 0) && (cifsFile->srch_inf.endOfSearch == FALSE)){
623                 cFYI(1,("calling findnext2"));
624                 rc = CIFSFindNext(xid,pTcon,cifsFile->netfid, 
625                                   &cifsFile->srch_inf);
626                 if(rc)
627                         return -ENOENT;
628         }
629         if(index_to_find < cifsFile->srch_inf.index_of_last_entry) {
630                 /* we found the buffer that contains the entry */
631                 /* scan and find it */
632                 int i;
633                 char * current_entry;
634                 char * end_of_smb = cifsFile->srch_inf.ntwrk_buf_start + 
635                         smbCalcSize((struct smb_hdr *)
636                                 cifsFile->srch_inf.ntwrk_buf_start);
637                 first_entry_in_buffer = cifsFile->srch_inf.index_of_last_entry
638                                         - cifsFile->srch_inf.entries_in_buffer;
639                 pos_in_buf = index_to_find - first_entry_in_buffer;
640                 cFYI(1,("found entry - pos_in_buf %d",pos_in_buf)); 
641                 current_entry = cifsFile->srch_inf.srch_entries_start;
642                 for(i=0;(i<(pos_in_buf)) && (current_entry != NULL);i++) {
643                         /* go entry by entry figuring out which is first */
644                         /* if( . or ..)
645                                 skip */
646                         rc = cifs_entry_is_dot(current_entry,cifsFile);
647                         if(rc == 1) /* is . or .. so skip */ {
648                                 cFYI(1,("Entry is .")); /* BB removeme BB */
649                                 /* continue; */
650                         } else if (rc == 2 ) {
651                                 cFYI(1,("Entry is ..")); /* BB removeme BB */
652                                 /* continue; */
653                         }
654                         current_entry = nxt_dir_entry(current_entry,end_of_smb);
655                 }
656                 if((current_entry == NULL) && (i < pos_in_buf)) {
657                         /* BB fixme - check if we should flag this error */
658                         cERROR(1,("reached end of buf searching for pos in buf"
659                           " %d index to find %lld rc %d",
660                           pos_in_buf,index_to_find,rc));
661                 }
662                 rc = 0;
663                 *ppCurrentEntry = current_entry;
664         } else {
665                 cFYI(1,("index not in buffer - could not findnext into it"));
666                 return 0;
667         }
668
669         if(pos_in_buf >= cifsFile->srch_inf.entries_in_buffer) {
670                 cFYI(1,("can not return entries pos_in_buf beyond last entry"));
671                 *num_to_ret = 0;
672         } else
673                 *num_to_ret = cifsFile->srch_inf.entries_in_buffer - pos_in_buf;
674
675         return rc;
676 }
677
678 /* inode num, inode type and filename returned */
679 static int cifs_get_name_from_search_buf(struct qstr *pqst,
680         char *current_entry, __u16 level, unsigned int unicode,
681         struct cifs_sb_info * cifs_sb, ino_t *pinum)
682 {
683         int rc = 0;
684         unsigned int len = 0;
685         char * filename;
686         struct nls_table * nlt = cifs_sb->local_nls;
687
688         *pinum = 0;
689
690         if(level == SMB_FIND_FILE_UNIX) {
691                 FILE_UNIX_INFO * pFindData = (FILE_UNIX_INFO *)current_entry;
692
693                 filename = &pFindData->FileName[0];
694                 if(unicode) {
695                         len = cifs_unicode_bytelen(filename);
696                 } else {
697                         /* BB should we make this strnlen of PATH_MAX? */
698                         len = strnlen(filename, PATH_MAX);
699                 }
700
701                 /* BB fixme - hash low and high 32 bits if not 64 bit arch BB fixme */
702                 if(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM)
703                         *pinum = pFindData->UniqueId;
704         } else if(level == SMB_FIND_FILE_DIRECTORY_INFO) {
705                 FILE_DIRECTORY_INFO * pFindData = 
706                         (FILE_DIRECTORY_INFO *)current_entry;
707                 filename = &pFindData->FileName[0];
708                 len = le32_to_cpu(pFindData->FileNameLength);
709         } else if(level == SMB_FIND_FILE_FULL_DIRECTORY_INFO) {
710                 FILE_FULL_DIRECTORY_INFO * pFindData = 
711                         (FILE_FULL_DIRECTORY_INFO *)current_entry;
712                 filename = &pFindData->FileName[0];
713                 len = le32_to_cpu(pFindData->FileNameLength);
714         } else if(level == SMB_FIND_FILE_ID_FULL_DIR_INFO) {
715                 SEARCH_ID_FULL_DIR_INFO * pFindData = 
716                         (SEARCH_ID_FULL_DIR_INFO *)current_entry;
717                 filename = &pFindData->FileName[0];
718                 len = le32_to_cpu(pFindData->FileNameLength);
719                 *pinum = pFindData->UniqueId;
720         } else if(level == SMB_FIND_FILE_BOTH_DIRECTORY_INFO) {
721                 FILE_BOTH_DIRECTORY_INFO * pFindData = 
722                         (FILE_BOTH_DIRECTORY_INFO *)current_entry;
723                 filename = &pFindData->FileName[0];
724                 len = le32_to_cpu(pFindData->FileNameLength);
725         } else {
726                 cFYI(1,("Unknown findfirst level %d",level));
727                 return -EINVAL;
728         }
729         if(unicode) {
730                 /* BB fixme - test with long names */
731                 /* Note converted filename can be longer than in unicode */
732                 if(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR)
733                         pqst->len = cifs_convertUCSpath((char *)pqst->name,
734                                         (__le16 *)filename, len/2, nlt);
735                 else
736                         pqst->len = cifs_strfromUCS_le((char *)pqst->name,
737                                         (__le16 *)filename,len/2,nlt);
738         } else {
739                 pqst->name = filename;
740                 pqst->len = len;
741         }
742         pqst->hash = full_name_hash(pqst->name,pqst->len);
743 /*      cFYI(1,("filldir on %s",pqst->name));  */
744         return rc;
745 }
746
747 static int cifs_filldir(char *pfindEntry, struct file *file,
748         filldir_t filldir, void *direntry, char *scratch_buf)
749 {
750         int rc = 0;
751         struct qstr qstring;
752         struct cifsFileInfo * pCifsF;
753         unsigned obj_type;
754         ino_t  inum;
755         struct cifs_sb_info * cifs_sb;
756         struct inode *tmp_inode;
757         struct dentry *tmp_dentry;
758
759         /* get filename and len into qstring */
760         /* get dentry */
761         /* decide whether to create and populate ionde */
762         if((direntry == NULL) || (file == NULL))
763                 return -EINVAL;
764
765         pCifsF = file->private_data;
766         
767         if((scratch_buf == NULL) || (pfindEntry == NULL) || (pCifsF == NULL))
768                 return -ENOENT;
769
770         if(file->f_dentry == NULL)
771                 return -ENOENT;
772
773         cifs_sb = CIFS_SB(file->f_dentry->d_sb);
774
775         qstring.name = scratch_buf;
776         rc = cifs_get_name_from_search_buf(&qstring,pfindEntry,
777                         pCifsF->srch_inf.info_level,
778                         pCifsF->srch_inf.unicode,cifs_sb,
779                         &inum /* returned */);
780
781         if(rc)
782                 return rc;
783
784         rc = construct_dentry(&qstring,file,&tmp_inode, &tmp_dentry);
785         if((tmp_inode == NULL) || (tmp_dentry == NULL))
786                 return -ENOMEM;
787
788         if(rc) {
789                 /* inode created, we need to hash it with right inode number */
790                 if(inum != 0) {
791                         /* BB fixme - hash the 2 32 quantities bits together if necessary BB */
792                         tmp_inode->i_ino = inum;
793                 }
794                 insert_inode_hash(tmp_inode);
795         }
796
797         /* we pass in rc below, indicating whether it is a new inode,
798            so we can figure out whether to invalidate the inode cached
799            data if the file has changed */
800         if(pCifsF->srch_inf.info_level == SMB_FIND_FILE_UNIX) {
801                 unix_fill_in_inode(tmp_inode,
802                                    (FILE_UNIX_INFO *)pfindEntry,&obj_type, rc);
803         } else {
804                 fill_in_inode(tmp_inode,
805                               (FILE_DIRECTORY_INFO *)pfindEntry,&obj_type, rc);
806         }
807         
808         rc = filldir(direntry,qstring.name,qstring.len,file->f_pos,
809                      tmp_inode->i_ino,obj_type);
810         if(rc) {
811                 cFYI(1,("filldir rc = %d",rc));
812         }
813
814         dput(tmp_dentry);
815         return rc;
816 }
817
818 static int cifs_save_resume_key(const char *current_entry,
819         struct cifsFileInfo *cifsFile)
820 {
821         int rc = 0;
822         unsigned int len = 0;
823         __u16 level;
824         char * filename;
825
826         if((cifsFile == NULL) || (current_entry == NULL))
827                 return -EINVAL;
828
829         level = cifsFile->srch_inf.info_level;
830
831         if(level == SMB_FIND_FILE_UNIX) {
832                 FILE_UNIX_INFO * pFindData = (FILE_UNIX_INFO *)current_entry;
833
834                 filename = &pFindData->FileName[0];
835                 if(cifsFile->srch_inf.unicode) {
836                         len = cifs_unicode_bytelen(filename);
837                 } else {
838                         /* BB should we make this strnlen of PATH_MAX? */
839                         len = strnlen(filename, PATH_MAX);
840                 }
841                 cifsFile->srch_inf.resume_key = pFindData->ResumeKey;
842         } else if(level == SMB_FIND_FILE_DIRECTORY_INFO) {
843                 FILE_DIRECTORY_INFO * pFindData = 
844                         (FILE_DIRECTORY_INFO *)current_entry;
845                 filename = &pFindData->FileName[0];
846                 len = le32_to_cpu(pFindData->FileNameLength);
847                 cifsFile->srch_inf.resume_key = pFindData->FileIndex;
848         } else if(level == SMB_FIND_FILE_FULL_DIRECTORY_INFO) {
849                 FILE_FULL_DIRECTORY_INFO * pFindData = 
850                         (FILE_FULL_DIRECTORY_INFO *)current_entry;
851                 filename = &pFindData->FileName[0];
852                 len = le32_to_cpu(pFindData->FileNameLength);
853                 cifsFile->srch_inf.resume_key = pFindData->FileIndex;
854         } else if(level == SMB_FIND_FILE_ID_FULL_DIR_INFO) {
855                 SEARCH_ID_FULL_DIR_INFO * pFindData = 
856                         (SEARCH_ID_FULL_DIR_INFO *)current_entry;
857                 filename = &pFindData->FileName[0];
858                 len = le32_to_cpu(pFindData->FileNameLength);
859                 cifsFile->srch_inf.resume_key = pFindData->FileIndex;
860         } else if(level == SMB_FIND_FILE_BOTH_DIRECTORY_INFO) {
861                 FILE_BOTH_DIRECTORY_INFO * pFindData = 
862                         (FILE_BOTH_DIRECTORY_INFO *)current_entry;
863                 filename = &pFindData->FileName[0];
864                 len = le32_to_cpu(pFindData->FileNameLength);
865                 cifsFile->srch_inf.resume_key = pFindData->FileIndex;
866         } else {
867                 cFYI(1,("Unknown findfirst level %d",level));
868                 return -EINVAL;
869         }
870         cifsFile->srch_inf.resume_name_len = len;
871         cifsFile->srch_inf.presume_name = filename;
872         return rc;
873 }
874
875 int cifs_readdir(struct file *file, void *direntry, filldir_t filldir)
876 {
877         int rc = 0;
878         int xid,i;
879         struct cifs_sb_info *cifs_sb;
880         struct cifsTconInfo *pTcon;
881         struct cifsFileInfo *cifsFile = NULL;
882         char * current_entry;
883         int num_to_fill = 0;
884         char * tmp_buf = NULL;
885         char * end_of_smb;
886
887         xid = GetXid();
888
889         if(file->f_dentry == NULL) {
890                 FreeXid(xid);
891                 return -EIO;
892         }
893
894         cifs_sb = CIFS_SB(file->f_dentry->d_sb);
895         pTcon = cifs_sb->tcon;
896         if(pTcon == NULL)
897                 return -EINVAL;
898
899         switch ((int) file->f_pos) {
900         case 0:
901                 /*if (filldir(direntry, ".", 1, file->f_pos,
902                      file->f_dentry->d_inode->i_ino, DT_DIR) < 0) {
903                         cERROR(1, ("Filldir for current dir failed "));
904                         rc = -ENOMEM;
905                         break;
906                 }
907                 file->f_pos++; */
908         case 1:
909                 /* if (filldir(direntry, "..", 2, file->f_pos,
910                      file->f_dentry->d_parent->d_inode->i_ino, DT_DIR) < 0) {
911                         cERROR(1, ("Filldir for parent dir failed "));
912                         rc = -ENOMEM;
913                         break;
914                 }
915                 file->f_pos++; */
916         case 2:
917                 /* 1) If search is active, 
918                         is in current search buffer? 
919                         if it before then restart search
920                         if after then keep searching till find it */
921
922                 if(file->private_data == NULL) {
923                         rc = initiate_cifs_search(xid,file);
924                         cFYI(1,("initiate cifs search rc %d",rc));
925                         if(rc) {
926                                 FreeXid(xid);
927                                 return rc;
928                         }
929                 }
930         default:
931                 if(file->private_data == NULL) {
932                         rc = -EINVAL;
933                         FreeXid(xid);
934                         return rc;
935                 }
936                 cifsFile = file->private_data;
937                 if (cifsFile->srch_inf.endOfSearch) {
938                         if(cifsFile->srch_inf.emptyDir) {
939                                 cFYI(1, ("End of search, empty dir"));
940                                 rc = 0;
941                                 break;
942                         }
943                 } /* else {
944                         cifsFile->invalidHandle = TRUE;
945                         CIFSFindClose(xid, pTcon, cifsFile->netfid);
946                 } 
947                 kfree(cifsFile->search_resume_name);
948                 cifsFile->search_resume_name = NULL; */
949
950                 /* BB account for . and .. in f_pos as special case */
951
952                 rc = find_cifs_entry(xid,pTcon, file,
953                                 &current_entry,&num_to_fill);
954                 if(rc) {
955                         cFYI(1,("fce error %d",rc)); 
956                         goto rddir2_exit;
957                 } else if (current_entry != NULL) {
958                         cFYI(1,("entry %lld found",file->f_pos));
959                 } else {
960                         cFYI(1,("could not find entry"));
961                         goto rddir2_exit;
962                 }
963                 cFYI(1,("loop through %d times filling dir for net buf %p",
964                         num_to_fill,cifsFile->srch_inf.ntwrk_buf_start)); 
965                 end_of_smb = cifsFile->srch_inf.ntwrk_buf_start +
966                         smbCalcSize((struct smb_hdr *)
967                                     cifsFile->srch_inf.ntwrk_buf_start);
968                 /* To be safe - for UCS to UTF-8 with strings loaded
969                 with the rare long characters alloc more to account for
970                 such multibyte target UTF-8 characters. cifs_unicode.c,
971                 which actually does the conversion, has the same limit */
972                 tmp_buf = kmalloc((2 * NAME_MAX) + 4, GFP_KERNEL);
973                 for(i=0;(i<num_to_fill) && (rc == 0);i++) {
974                         if(current_entry == NULL) {
975                                 /* evaluate whether this case is an error */
976                                 cERROR(1,("past end of SMB num to fill %d i %d",
977                                           num_to_fill, i));
978                                 break;
979                         }
980
981                         rc = cifs_filldir(current_entry, file, 
982                                         filldir, direntry,tmp_buf);
983                         file->f_pos++;
984                         if(file->f_pos == cifsFile->srch_inf.index_of_last_entry) {
985                                 cFYI(1,("last entry in buf at pos %lld %s",
986                                         file->f_pos,tmp_buf)); /* BB removeme BB */
987                                 cifs_save_resume_key(current_entry,cifsFile);
988                                 break;
989                         } else 
990                                 current_entry = nxt_dir_entry(current_entry,
991                                                               end_of_smb);
992                 }
993                 kfree(tmp_buf);
994                 break;
995         } /* end switch */
996
997 rddir2_exit:
998         FreeXid(xid);
999         return rc;
1000 }