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[PATCH] inode-diet: Eliminate i_blksize from the inode structure
[linux-2.6/mini2440.git] / fs / cifs / readdir.c
blobb27b34537bf23c2bf3bbc566c1155c3d331df7a1
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 fill_in_inode(struct inode *tmp_inode, int new_buf_type,
110 char * buf, int *pobject_type, int isNewInode)
111 {
112 loff_t local_size;
113 struct timespec local_mtime;
114
115 struct cifsInodeInfo *cifsInfo = CIFS_I(tmp_inode);
116 struct cifs_sb_info *cifs_sb = CIFS_SB(tmp_inode->i_sb);
117 __u32 attr;
118 __u64 allocation_size;
119 __u64 end_of_file;
120
121 /* save mtime and size */
122 local_mtime = tmp_inode->i_mtime;
123 local_size = tmp_inode->i_size;
124
125 if(new_buf_type) {
126 FILE_DIRECTORY_INFO *pfindData = (FILE_DIRECTORY_INFO *)buf;
127
128 attr = le32_to_cpu(pfindData->ExtFileAttributes);
129 allocation_size = le64_to_cpu(pfindData->AllocationSize);
130 end_of_file = le64_to_cpu(pfindData->EndOfFile);
131 tmp_inode->i_atime =
132 cifs_NTtimeToUnix(le64_to_cpu(pfindData->LastAccessTime));
133 tmp_inode->i_mtime =
134 cifs_NTtimeToUnix(le64_to_cpu(pfindData->LastWriteTime));
135 tmp_inode->i_ctime =
136 cifs_NTtimeToUnix(le64_to_cpu(pfindData->ChangeTime));
137 } else { /* legacy, OS2 and DOS style */
138 FIND_FILE_STANDARD_INFO * pfindData =
139 (FIND_FILE_STANDARD_INFO *)buf;
140
141 attr = le16_to_cpu(pfindData->Attributes);
142 allocation_size = le32_to_cpu(pfindData->AllocationSize);
143 end_of_file = le32_to_cpu(pfindData->DataSize);
144 tmp_inode->i_atime = CURRENT_TIME;
145 /* tmp_inode->i_mtime = BB FIXME - add dos time handling
146 tmp_inode->i_ctime = 0; BB FIXME */
147
148 }
149
150 /* Linux can not store file creation time unfortunately so ignore it */
151
152 cifsInfo->cifsAttrs = attr;
153 cifsInfo->time = jiffies;
154
155 /* treat dos attribute of read-only as read-only mode bit e.g. 555? */
156 /* 2767 perms - indicate mandatory locking */
157 /* BB fill in uid and gid here? with help from winbind?
158 or retrieve from NTFS stream extended attribute */
159 if (atomic_read(&cifsInfo->inUse) == 0) {
160 tmp_inode->i_uid = cifs_sb->mnt_uid;
161 tmp_inode->i_gid = cifs_sb->mnt_gid;
162 /* set default mode. will override for dirs below */
163 tmp_inode->i_mode = cifs_sb->mnt_file_mode;
164 } else {
165 /* mask off the type bits since it gets set
166 below and we do not want to get two type
167 bits set */
168 tmp_inode->i_mode &= ~S_IFMT;
169 }
170
171 if (attr & ATTR_DIRECTORY) {
172 *pobject_type = DT_DIR;
173 /* override default perms since we do not lock dirs */
174 if(atomic_read(&cifsInfo->inUse) == 0) {
175 tmp_inode->i_mode = cifs_sb->mnt_dir_mode;
176 }
177 tmp_inode->i_mode |= S_IFDIR;
178 } else if ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_UNX_EMUL) &&
179 (attr & ATTR_SYSTEM)) {
180 if (end_of_file == 0) {
181 *pobject_type = DT_FIFO;
182 tmp_inode->i_mode |= S_IFIFO;
183 } else {
184 /* rather than get the type here, we mark the
185 inode as needing revalidate and get the real type
186 (blk vs chr vs. symlink) later ie in lookup */
187 *pobject_type = DT_REG;
188 tmp_inode->i_mode |= S_IFREG;
189 cifsInfo->time = 0;
190 }
191 /* we no longer mark these because we could not follow them */
192 /* } else if (attr & ATTR_REPARSE) {
193 *pobject_type = DT_LNK;
194 tmp_inode->i_mode |= S_IFLNK; */
195 } else {
196 *pobject_type = DT_REG;
197 tmp_inode->i_mode |= S_IFREG;
198 if (attr & ATTR_READONLY)
199 tmp_inode->i_mode &= ~(S_IWUGO);
200 } /* could add code here - to validate if device or weird share type? */
201
202 /* can not fill in nlink here as in qpathinfo version and Unx search */
203 if (atomic_read(&cifsInfo->inUse) == 0) {
204 atomic_set(&cifsInfo->inUse, 1);
205 }
206
207 if (is_size_safe_to_change(cifsInfo)) {
208 /* can not safely change the file size here if the
209 client is writing to it due to potential races */
210 i_size_write(tmp_inode, end_of_file);
211
212 /* 512 bytes (2**9) is the fake blocksize that must be used */
213 /* for this calculation, even though the reported blocksize is larger */
214 tmp_inode->i_blocks = (512 - 1 + allocation_size) >> 9;
215 }
216
217 if (allocation_size < end_of_file)
218 cFYI(1, ("May be sparse file, allocation less than file size"));
219 cFYI(1, ("File Size %ld and blocks %llu",
220 (unsigned long)tmp_inode->i_size,
221 (unsigned long long)tmp_inode->i_blocks));
222 if (S_ISREG(tmp_inode->i_mode)) {
223 cFYI(1, ("File inode"));
224 tmp_inode->i_op = &cifs_file_inode_ops;
225 if(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DIRECT_IO) {
226 if(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_BRL)
227 tmp_inode->i_fop = &cifs_file_direct_nobrl_ops;
228 else
229 tmp_inode->i_fop = &cifs_file_direct_ops;
230
231 } else if(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_BRL)
232 tmp_inode->i_fop = &cifs_file_nobrl_ops;
233 else
234 tmp_inode->i_fop = &cifs_file_ops;
235
236 if((cifs_sb->tcon) && (cifs_sb->tcon->ses) &&
237 (cifs_sb->tcon->ses->server->maxBuf <
238 PAGE_CACHE_SIZE + MAX_CIFS_HDR_SIZE))
239 tmp_inode->i_data.a_ops = &cifs_addr_ops_smallbuf;
240 else
241 tmp_inode->i_data.a_ops = &cifs_addr_ops;
242
243 if(isNewInode)
244 return; /* No sense invalidating pages for new inode
245 since have not started caching readahead file
246 data yet */
247
248 if (timespec_equal(&tmp_inode->i_mtime, &local_mtime) &&
249 (local_size == tmp_inode->i_size)) {
250 cFYI(1, ("inode exists but unchanged"));
251 } else {
252 /* file may have changed on server */
253 cFYI(1, ("invalidate inode, readdir detected change"));
254 invalidate_remote_inode(tmp_inode);
255 }
256 } else if (S_ISDIR(tmp_inode->i_mode)) {
257 cFYI(1, ("Directory inode"));
258 tmp_inode->i_op = &cifs_dir_inode_ops;
259 tmp_inode->i_fop = &cifs_dir_ops;
260 } else if (S_ISLNK(tmp_inode->i_mode)) {
261 cFYI(1, ("Symbolic Link inode"));
262 tmp_inode->i_op = &cifs_symlink_inode_ops;
263 } else {
264 cFYI(1, ("Init special inode"));
265 init_special_inode(tmp_inode, tmp_inode->i_mode,
266 tmp_inode->i_rdev);
267 }
268 }
269
270 static void unix_fill_in_inode(struct inode *tmp_inode,
271 FILE_UNIX_INFO *pfindData, int *pobject_type, int isNewInode)
272 {
273 loff_t local_size;
274 struct timespec local_mtime;
275
276 struct cifsInodeInfo *cifsInfo = CIFS_I(tmp_inode);
277 struct cifs_sb_info *cifs_sb = CIFS_SB(tmp_inode->i_sb);
278
279 __u32 type = le32_to_cpu(pfindData->Type);
280 __u64 num_of_bytes = le64_to_cpu(pfindData->NumOfBytes);
281 __u64 end_of_file = le64_to_cpu(pfindData->EndOfFile);
282 cifsInfo->time = jiffies;
283 atomic_inc(&cifsInfo->inUse);
284
285 /* save mtime and size */
286 local_mtime = tmp_inode->i_mtime;
287 local_size = tmp_inode->i_size;
288
289 tmp_inode->i_atime =
290 cifs_NTtimeToUnix(le64_to_cpu(pfindData->LastAccessTime));
291 tmp_inode->i_mtime =
292 cifs_NTtimeToUnix(le64_to_cpu(pfindData->LastModificationTime));
293 tmp_inode->i_ctime =
294 cifs_NTtimeToUnix(le64_to_cpu(pfindData->LastStatusChange));
295
296 tmp_inode->i_mode = le64_to_cpu(pfindData->Permissions);
297 /* since we set the inode type below we need to mask off type
298 to avoid strange results if bits above were corrupt */
299 tmp_inode->i_mode &= ~S_IFMT;
300 if (type == UNIX_FILE) {
301 *pobject_type = DT_REG;
302 tmp_inode->i_mode |= S_IFREG;
303 } else if (type == UNIX_SYMLINK) {
304 *pobject_type = DT_LNK;
305 tmp_inode->i_mode |= S_IFLNK;
306 } else if (type == UNIX_DIR) {
307 *pobject_type = DT_DIR;
308 tmp_inode->i_mode |= S_IFDIR;
309 } else if (type == UNIX_CHARDEV) {
310 *pobject_type = DT_CHR;
311 tmp_inode->i_mode |= S_IFCHR;
312 tmp_inode->i_rdev = MKDEV(le64_to_cpu(pfindData->DevMajor),
313 le64_to_cpu(pfindData->DevMinor) & MINORMASK);
314 } else if (type == UNIX_BLOCKDEV) {
315 *pobject_type = DT_BLK;
316 tmp_inode->i_mode |= S_IFBLK;
317 tmp_inode->i_rdev = MKDEV(le64_to_cpu(pfindData->DevMajor),
318 le64_to_cpu(pfindData->DevMinor) & MINORMASK);
319 } else if (type == UNIX_FIFO) {
320 *pobject_type = DT_FIFO;
321 tmp_inode->i_mode |= S_IFIFO;
322 } else if (type == UNIX_SOCKET) {
323 *pobject_type = DT_SOCK;
324 tmp_inode->i_mode |= S_IFSOCK;
325 } else {
326 /* safest to just call it a file */
327 *pobject_type = DT_REG;
328 tmp_inode->i_mode |= S_IFREG;
329 cFYI(1,("unknown inode type %d",type));
330 }
331
332 tmp_inode->i_uid = le64_to_cpu(pfindData->Uid);
333 tmp_inode->i_gid = le64_to_cpu(pfindData->Gid);
334 tmp_inode->i_nlink = le64_to_cpu(pfindData->Nlinks);
335
336 if (is_size_safe_to_change(cifsInfo)) {
337 /* can not safely change the file size here if the
338 client is writing to it due to potential races */
339 i_size_write(tmp_inode,end_of_file);
340
341 /* 512 bytes (2**9) is the fake blocksize that must be used */
342 /* for this calculation, not the real blocksize */
343 tmp_inode->i_blocks = (512 - 1 + num_of_bytes) >> 9;
344 }
345
346 if (S_ISREG(tmp_inode->i_mode)) {
347 cFYI(1, ("File inode"));
348 tmp_inode->i_op = &cifs_file_inode_ops;
349
350 if(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DIRECT_IO) {
351 if(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_BRL)
352 tmp_inode->i_fop = &cifs_file_direct_nobrl_ops;
353 else
354 tmp_inode->i_fop = &cifs_file_direct_ops;
355
356 } else if(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_BRL)
357 tmp_inode->i_fop = &cifs_file_nobrl_ops;
358 else
359 tmp_inode->i_fop = &cifs_file_ops;
360
361 if((cifs_sb->tcon) && (cifs_sb->tcon->ses) &&
362 (cifs_sb->tcon->ses->server->maxBuf <
363 PAGE_CACHE_SIZE + MAX_CIFS_HDR_SIZE))
364 tmp_inode->i_data.a_ops = &cifs_addr_ops_smallbuf;
365 else
366 tmp_inode->i_data.a_ops = &cifs_addr_ops;
367
368 if(isNewInode)
369 return; /* No sense invalidating pages for new inode since we
370 have not started caching readahead file data yet */
371
372 if (timespec_equal(&tmp_inode->i_mtime, &local_mtime) &&
373 (local_size == tmp_inode->i_size)) {
374 cFYI(1, ("inode exists but unchanged"));
375 } else {
376 /* file may have changed on server */
377 cFYI(1, ("invalidate inode, readdir detected change"));
378 invalidate_remote_inode(tmp_inode);
379 }
380 } else if (S_ISDIR(tmp_inode->i_mode)) {
381 cFYI(1, ("Directory inode"));
382 tmp_inode->i_op = &cifs_dir_inode_ops;
383 tmp_inode->i_fop = &cifs_dir_ops;
384 } else if (S_ISLNK(tmp_inode->i_mode)) {
385 cFYI(1, ("Symbolic Link inode"));
386 tmp_inode->i_op = &cifs_symlink_inode_ops;
387 /* tmp_inode->i_fop = *//* do not need to set to anything */
388 } else {
389 cFYI(1, ("Special inode"));
390 init_special_inode(tmp_inode, tmp_inode->i_mode,
391 tmp_inode->i_rdev);
392 }
393 }
394
395 static int initiate_cifs_search(const int xid, struct file *file)
396 {
397 int rc = 0;
398 char * full_path;
399 struct cifsFileInfo * cifsFile;
400 struct cifs_sb_info *cifs_sb;
401 struct cifsTconInfo *pTcon;
402
403 if(file->private_data == NULL) {
404 file->private_data =
405 kmalloc(sizeof(struct cifsFileInfo),GFP_KERNEL);
406 }
407
408 if(file->private_data == NULL) {
409 return -ENOMEM;
410 } else {
411 memset(file->private_data,0,sizeof(struct cifsFileInfo));
412 }
413 cifsFile = file->private_data;
414 cifsFile->invalidHandle = TRUE;
415 cifsFile->srch_inf.endOfSearch = FALSE;
416
417 if(file->f_dentry == NULL)
418 return -ENOENT;
419
420 cifs_sb = CIFS_SB(file->f_dentry->d_sb);
421 if(cifs_sb == NULL)
422 return -EINVAL;
423
424 pTcon = cifs_sb->tcon;
425 if(pTcon == NULL)
426 return -EINVAL;
427
428 full_path = build_path_from_dentry(file->f_dentry);
429
430 if(full_path == NULL) {
431 return -ENOMEM;
432 }
433
434 cFYI(1, ("Full path: %s start at: %lld", full_path, file->f_pos));
435
436 ffirst_retry:
437 /* test for Unix extensions */
438 if (pTcon->ses->capabilities & CAP_UNIX) {
439 cifsFile->srch_inf.info_level = SMB_FIND_FILE_UNIX;
440 } else if ((pTcon->ses->capabilities &
441 (CAP_NT_SMBS | CAP_NT_FIND)) == 0) {
442 cifsFile->srch_inf.info_level = SMB_FIND_FILE_INFO_STANDARD;
443 } else if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM) {
444 cifsFile->srch_inf.info_level = SMB_FIND_FILE_ID_FULL_DIR_INFO;
445 } else /* not srvinos - BB fixme add check for backlevel? */ {
446 cifsFile->srch_inf.info_level = SMB_FIND_FILE_DIRECTORY_INFO;
447 }
448
449 rc = CIFSFindFirst(xid, pTcon,full_path,cifs_sb->local_nls,
450 &cifsFile->netfid, &cifsFile->srch_inf,
451 cifs_sb->mnt_cifs_flags &
452 CIFS_MOUNT_MAP_SPECIAL_CHR, CIFS_DIR_SEP(cifs_sb));
453 if(rc == 0)
454 cifsFile->invalidHandle = FALSE;
455 if((rc == -EOPNOTSUPP) &&
456 (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM)) {
457 cifs_sb->mnt_cifs_flags &= ~CIFS_MOUNT_SERVER_INUM;
458 goto ffirst_retry;
459 }
460 kfree(full_path);
461 return rc;
462 }
463
464 /* return length of unicode string in bytes */
465 static int cifs_unicode_bytelen(char *str)
466 {
467 int len;
468 __le16 * ustr = (__le16 *)str;
469
470 for(len=0;len <= PATH_MAX;len++) {
471 if(ustr[len] == 0)
472 return len << 1;
473 }
474 cFYI(1,("Unicode string longer than PATH_MAX found"));
475 return len << 1;
476 }
477
478 static char *nxt_dir_entry(char *old_entry, char *end_of_smb, int level)
479 {
480 char * new_entry;
481 FILE_DIRECTORY_INFO * pDirInfo = (FILE_DIRECTORY_INFO *)old_entry;
482
483 if(level == SMB_FIND_FILE_INFO_STANDARD) {
484 FIND_FILE_STANDARD_INFO * pfData;
485 pfData = (FIND_FILE_STANDARD_INFO *)pDirInfo;
486
487 new_entry = old_entry + sizeof(FIND_FILE_STANDARD_INFO) +
488 pfData->FileNameLength;
489 } else
490 new_entry = old_entry + le32_to_cpu(pDirInfo->NextEntryOffset);
491 cFYI(1,("new entry %p old entry %p",new_entry,old_entry));
492 /* validate that new_entry is not past end of SMB */
493 if(new_entry >= end_of_smb) {
494 cERROR(1,
495 ("search entry %p began after end of SMB %p old entry %p",
496 new_entry, end_of_smb, old_entry));
497 return NULL;
498 } else if(((level == SMB_FIND_FILE_INFO_STANDARD) &&
499 (new_entry + sizeof(FIND_FILE_STANDARD_INFO) > end_of_smb)) ||
500 ((level != SMB_FIND_FILE_INFO_STANDARD) &&
501 (new_entry + sizeof(FILE_DIRECTORY_INFO) > end_of_smb))) {
502 cERROR(1,("search entry %p extends after end of SMB %p",
503 new_entry, end_of_smb));
504 return NULL;
505 } else
506 return new_entry;
507
508 }
509
510 #define UNICODE_DOT cpu_to_le16(0x2e)
511
512 /* return 0 if no match and 1 for . (current directory) and 2 for .. (parent) */
513 static int cifs_entry_is_dot(char *current_entry, struct cifsFileInfo *cfile)
514 {
515 int rc = 0;
516 char * filename = NULL;
517 int len = 0;
518
519 if(cfile->srch_inf.info_level == SMB_FIND_FILE_UNIX) {
520 FILE_UNIX_INFO * pFindData = (FILE_UNIX_INFO *)current_entry;
521 filename = &pFindData->FileName[0];
522 if(cfile->srch_inf.unicode) {
523 len = cifs_unicode_bytelen(filename);
524 } else {
525 /* BB should we make this strnlen of PATH_MAX? */
526 len = strnlen(filename, 5);
527 }
528 } else if(cfile->srch_inf.info_level == SMB_FIND_FILE_DIRECTORY_INFO) {
529 FILE_DIRECTORY_INFO * pFindData =
530 (FILE_DIRECTORY_INFO *)current_entry;
531 filename = &pFindData->FileName[0];
532 len = le32_to_cpu(pFindData->FileNameLength);
533 } else if(cfile->srch_inf.info_level ==
534 SMB_FIND_FILE_FULL_DIRECTORY_INFO) {
535 FILE_FULL_DIRECTORY_INFO * pFindData =
536 (FILE_FULL_DIRECTORY_INFO *)current_entry;
537 filename = &pFindData->FileName[0];
538 len = le32_to_cpu(pFindData->FileNameLength);
539 } else if(cfile->srch_inf.info_level ==
540 SMB_FIND_FILE_ID_FULL_DIR_INFO) {
541 SEARCH_ID_FULL_DIR_INFO * pFindData =
542 (SEARCH_ID_FULL_DIR_INFO *)current_entry;
543 filename = &pFindData->FileName[0];
544 len = le32_to_cpu(pFindData->FileNameLength);
545 } else if(cfile->srch_inf.info_level ==
546 SMB_FIND_FILE_BOTH_DIRECTORY_INFO) {
547 FILE_BOTH_DIRECTORY_INFO * pFindData =
548 (FILE_BOTH_DIRECTORY_INFO *)current_entry;
549 filename = &pFindData->FileName[0];
550 len = le32_to_cpu(pFindData->FileNameLength);
551 } else if(cfile->srch_inf.info_level == SMB_FIND_FILE_INFO_STANDARD) {
552 FIND_FILE_STANDARD_INFO * pFindData =
553 (FIND_FILE_STANDARD_INFO *)current_entry;
554 filename = &pFindData->FileName[0];
555 len = pFindData->FileNameLength;
556 } else {
557 cFYI(1,("Unknown findfirst level %d",cfile->srch_inf.info_level));
558 }
559
560 if(filename) {
561 if(cfile->srch_inf.unicode) {
562 __le16 *ufilename = (__le16 *)filename;
563 if(len == 2) {
564 /* check for . */
565 if(ufilename[0] == UNICODE_DOT)
566 rc = 1;
567 } else if(len == 4) {
568 /* check for .. */
569 if((ufilename[0] == UNICODE_DOT)
570 &&(ufilename[1] == UNICODE_DOT))
571 rc = 2;
572 }
573 } else /* ASCII */ {
574 if(len == 1) {
575 if(filename[0] == '.')
576 rc = 1;
577 } else if(len == 2) {
578 if((filename[0] == '.') && (filename[1] == '.'))
579 rc = 2;
580 }
581 }
582 }
583
584 return rc;
585 }
586
587 /* Check if directory that we are searching has changed so we can decide
588 whether we can use the cached search results from the previous search */
589 static int is_dir_changed(struct file * file)
590 {
591 struct inode * inode;
592 struct cifsInodeInfo *cifsInfo;
593
594 if(file->f_dentry == NULL)
595 return 0;
596
597 inode = file->f_dentry->d_inode;
598
599 if(inode == NULL)
600 return 0;
601
602 cifsInfo = CIFS_I(inode);
603
604 if(cifsInfo->time == 0)
605 return 1; /* directory was changed, perhaps due to unlink */
606 else
607 return 0;
608
609 }
610
611 /* find the corresponding entry in the search */
612 /* Note that the SMB server returns search entries for . and .. which
613 complicates logic here if we choose to parse for them and we do not
614 assume that they are located in the findfirst return buffer.*/
615 /* We start counting in the buffer with entry 2 and increment for every
616 entry (do not increment for . or .. entry) */
617 static int find_cifs_entry(const int xid, struct cifsTconInfo *pTcon,
618 struct file *file, char **ppCurrentEntry, int *num_to_ret)
619 {
620 int rc = 0;
621 int pos_in_buf = 0;
622 loff_t first_entry_in_buffer;
623 loff_t index_to_find = file->f_pos;
624 struct cifsFileInfo * cifsFile = file->private_data;
625 /* check if index in the buffer */
626
627 if((cifsFile == NULL) || (ppCurrentEntry == NULL) ||
628 (num_to_ret == NULL))
629 return -ENOENT;
630
631 *ppCurrentEntry = NULL;
632 first_entry_in_buffer =
633 cifsFile->srch_inf.index_of_last_entry -
634 cifsFile->srch_inf.entries_in_buffer;
635
636 /* if first entry in buf is zero then is first buffer
637 in search response data which means it is likely . and ..
638 will be in this buffer, although some servers do not return
639 . and .. for the root of a drive and for those we need
640 to start two entries earlier */
641
642 #ifdef CONFIG_CIFS_DEBUG2
643 dump_cifs_file_struct(file, "In fce ");
644 #endif
645 if(((index_to_find < cifsFile->srch_inf.index_of_last_entry) &&
646 is_dir_changed(file)) ||
647 (index_to_find < first_entry_in_buffer)) {
648 /* close and restart search */
649 cFYI(1,("search backing up - close and restart search"));
650 cifsFile->invalidHandle = TRUE;
651 CIFSFindClose(xid, pTcon, cifsFile->netfid);
652 kfree(cifsFile->search_resume_name);
653 cifsFile->search_resume_name = NULL;
654 if(cifsFile->srch_inf.ntwrk_buf_start) {
655 cFYI(1,("freeing SMB ff cache buf on search rewind"));
656 if(cifsFile->srch_inf.smallBuf)
657 cifs_small_buf_release(cifsFile->srch_inf.
658 ntwrk_buf_start);
659 else
660 cifs_buf_release(cifsFile->srch_inf.
661 ntwrk_buf_start);
662 }
663 rc = initiate_cifs_search(xid,file);
664 if(rc) {
665 cFYI(1,("error %d reinitiating a search on rewind",rc));
666 return rc;
667 }
668 }
669
670 while((index_to_find >= cifsFile->srch_inf.index_of_last_entry) &&
671 (rc == 0) && (cifsFile->srch_inf.endOfSearch == FALSE)){
672 cFYI(1,("calling findnext2"));
673 rc = CIFSFindNext(xid,pTcon,cifsFile->netfid,
674 &cifsFile->srch_inf);
675 if(rc)
676 return -ENOENT;
677 }
678 if(index_to_find < cifsFile->srch_inf.index_of_last_entry) {
679 /* we found the buffer that contains the entry */
680 /* scan and find it */
681 int i;
682 char * current_entry;
683 char * end_of_smb = cifsFile->srch_inf.ntwrk_buf_start +
684 smbCalcSize((struct smb_hdr *)
685 cifsFile->srch_inf.ntwrk_buf_start);
686
687 current_entry = cifsFile->srch_inf.srch_entries_start;
688 first_entry_in_buffer = cifsFile->srch_inf.index_of_last_entry
689 - cifsFile->srch_inf.entries_in_buffer;
690 pos_in_buf = index_to_find - first_entry_in_buffer;
691 cFYI(1,("found entry - pos_in_buf %d",pos_in_buf));
692
693 for(i=0;(i<(pos_in_buf)) && (current_entry != NULL);i++) {
694 /* go entry by entry figuring out which is first */
695 current_entry = nxt_dir_entry(current_entry,end_of_smb,
696 cifsFile->srch_inf.info_level);
697 }
698 if((current_entry == NULL) && (i < pos_in_buf)) {
699 /* BB fixme - check if we should flag this error */
700 cERROR(1,("reached end of buf searching for pos in buf"
701 " %d index to find %lld rc %d",
702 pos_in_buf,index_to_find,rc));
703 }
704 rc = 0;
705 *ppCurrentEntry = current_entry;
706 } else {
707 cFYI(1,("index not in buffer - could not findnext into it"));
708 return 0;
709 }
710
711 if(pos_in_buf >= cifsFile->srch_inf.entries_in_buffer) {
712 cFYI(1,("can not return entries pos_in_buf beyond last entry"));
713 *num_to_ret = 0;
714 } else
715 *num_to_ret = cifsFile->srch_inf.entries_in_buffer - pos_in_buf;
716
717 return rc;
718 }
719
720 /* inode num, inode type and filename returned */
721 static int cifs_get_name_from_search_buf(struct qstr *pqst,
722 char *current_entry, __u16 level, unsigned int unicode,
723 struct cifs_sb_info * cifs_sb, int max_len, ino_t *pinum)
724 {
725 int rc = 0;
726 unsigned int len = 0;
727 char * filename;
728 struct nls_table * nlt = cifs_sb->local_nls;
729
730 *pinum = 0;
731
732 if(level == SMB_FIND_FILE_UNIX) {
733 FILE_UNIX_INFO * pFindData = (FILE_UNIX_INFO *)current_entry;
734
735 filename = &pFindData->FileName[0];
736 if(unicode) {
737 len = cifs_unicode_bytelen(filename);
738 } else {
739 /* BB should we make this strnlen of PATH_MAX? */
740 len = strnlen(filename, PATH_MAX);
741 }
742
743 /* BB fixme - hash low and high 32 bits if not 64 bit arch BB fixme */
744 if(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM)
745 *pinum = pFindData->UniqueId;
746 } else if(level == SMB_FIND_FILE_DIRECTORY_INFO) {
747 FILE_DIRECTORY_INFO * pFindData =
748 (FILE_DIRECTORY_INFO *)current_entry;
749 filename = &pFindData->FileName[0];
750 len = le32_to_cpu(pFindData->FileNameLength);
751 } else if(level == SMB_FIND_FILE_FULL_DIRECTORY_INFO) {
752 FILE_FULL_DIRECTORY_INFO * pFindData =
753 (FILE_FULL_DIRECTORY_INFO *)current_entry;
754 filename = &pFindData->FileName[0];
755 len = le32_to_cpu(pFindData->FileNameLength);
756 } else if(level == SMB_FIND_FILE_ID_FULL_DIR_INFO) {
757 SEARCH_ID_FULL_DIR_INFO * pFindData =
758 (SEARCH_ID_FULL_DIR_INFO *)current_entry;
759 filename = &pFindData->FileName[0];
760 len = le32_to_cpu(pFindData->FileNameLength);
761 *pinum = pFindData->UniqueId;
762 } else if(level == SMB_FIND_FILE_BOTH_DIRECTORY_INFO) {
763 FILE_BOTH_DIRECTORY_INFO * pFindData =
764 (FILE_BOTH_DIRECTORY_INFO *)current_entry;
765 filename = &pFindData->FileName[0];
766 len = le32_to_cpu(pFindData->FileNameLength);
767 } else if(level == SMB_FIND_FILE_INFO_STANDARD) {
768 FIND_FILE_STANDARD_INFO * pFindData =
769 (FIND_FILE_STANDARD_INFO *)current_entry;
770 filename = &pFindData->FileName[0];
771 /* one byte length, no name conversion */
772 len = (unsigned int)pFindData->FileNameLength;
773 } else {
774 cFYI(1,("Unknown findfirst level %d",level));
775 return -EINVAL;
776 }
777
778 if(len > max_len) {
779 cERROR(1,("bad search response length %d past smb end", len));
780 return -EINVAL;
781 }
782
783 if(unicode) {
784 /* BB fixme - test with long names */
785 /* Note converted filename can be longer than in unicode */
786 if(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR)
787 pqst->len = cifs_convertUCSpath((char *)pqst->name,
788 (__le16 *)filename, len/2, nlt);
789 else
790 pqst->len = cifs_strfromUCS_le((char *)pqst->name,
791 (__le16 *)filename,len/2,nlt);
792 } else {
793 pqst->name = filename;
794 pqst->len = len;
795 }
796 pqst->hash = full_name_hash(pqst->name,pqst->len);
797 /* cFYI(1,("filldir on %s",pqst->name)); */
798 return rc;
799 }
800
801 static int cifs_filldir(char *pfindEntry, struct file *file,
802 filldir_t filldir, void *direntry, char *scratch_buf, int max_len)
803 {
804 int rc = 0;
805 struct qstr qstring;
806 struct cifsFileInfo * pCifsF;
807 unsigned obj_type;
808 ino_t inum;
809 struct cifs_sb_info * cifs_sb;
810 struct inode *tmp_inode;
811 struct dentry *tmp_dentry;
812
813 /* get filename and len into qstring */
814 /* get dentry */
815 /* decide whether to create and populate ionde */
816 if((direntry == NULL) || (file == NULL))
817 return -EINVAL;
818
819 pCifsF = file->private_data;
820
821 if((scratch_buf == NULL) || (pfindEntry == NULL) || (pCifsF == NULL))
822 return -ENOENT;
823
824 if(file->f_dentry == NULL)
825 return -ENOENT;
826
827 rc = cifs_entry_is_dot(pfindEntry,pCifsF);
828 /* skip . and .. since we added them first */
829 if(rc != 0)
830 return 0;
831
832 cifs_sb = CIFS_SB(file->f_dentry->d_sb);
833
834 qstring.name = scratch_buf;
835 rc = cifs_get_name_from_search_buf(&qstring,pfindEntry,
836 pCifsF->srch_inf.info_level,
837 pCifsF->srch_inf.unicode,cifs_sb,
838 max_len,
839 &inum /* returned */);
840
841 if(rc)
842 return rc;
843
844 rc = construct_dentry(&qstring,file,&tmp_inode, &tmp_dentry);
845 if((tmp_inode == NULL) || (tmp_dentry == NULL))
846 return -ENOMEM;
847
848 if(rc) {
849 /* inode created, we need to hash it with right inode number */
850 if(inum != 0) {
851 /* BB fixme - hash the 2 32 quantities bits together if necessary BB */
852 tmp_inode->i_ino = inum;
853 }
854 insert_inode_hash(tmp_inode);
855 }
856
857 /* we pass in rc below, indicating whether it is a new inode,
858 so we can figure out whether to invalidate the inode cached
859 data if the file has changed */
860 if(pCifsF->srch_inf.info_level == SMB_FIND_FILE_UNIX)
861 unix_fill_in_inode(tmp_inode,
862 (FILE_UNIX_INFO *)pfindEntry,
863 &obj_type, rc);
864 else if(pCifsF->srch_inf.info_level == SMB_FIND_FILE_INFO_STANDARD)
865 fill_in_inode(tmp_inode, 0 /* old level 1 buffer type */,
866 pfindEntry, &obj_type, rc);
867 else
868 fill_in_inode(tmp_inode, 1 /* NT */, pfindEntry, &obj_type, rc);
869
870 if(rc) /* new inode - needs to be tied to dentry */ {
871 d_instantiate(tmp_dentry, tmp_inode);
872 if(rc == 2)
873 d_rehash(tmp_dentry);
874 }
875
876
877 rc = filldir(direntry,qstring.name,qstring.len,file->f_pos,
878 tmp_inode->i_ino,obj_type);
879 if(rc) {
880 cFYI(1,("filldir rc = %d",rc));
881 }
882
883 dput(tmp_dentry);
884 return rc;
885 }
886
887 static int cifs_save_resume_key(const char *current_entry,
888 struct cifsFileInfo *cifsFile)
889 {
890 int rc = 0;
891 unsigned int len = 0;
892 __u16 level;
893 char * filename;
894
895 if((cifsFile == NULL) || (current_entry == NULL))
896 return -EINVAL;
897
898 level = cifsFile->srch_inf.info_level;
899
900 if(level == SMB_FIND_FILE_UNIX) {
901 FILE_UNIX_INFO * pFindData = (FILE_UNIX_INFO *)current_entry;
902
903 filename = &pFindData->FileName[0];
904 if(cifsFile->srch_inf.unicode) {
905 len = cifs_unicode_bytelen(filename);
906 } else {
907 /* BB should we make this strnlen of PATH_MAX? */
908 len = strnlen(filename, PATH_MAX);
909 }
910 cifsFile->srch_inf.resume_key = pFindData->ResumeKey;
911 } else if(level == SMB_FIND_FILE_DIRECTORY_INFO) {
912 FILE_DIRECTORY_INFO * pFindData =
913 (FILE_DIRECTORY_INFO *)current_entry;
914 filename = &pFindData->FileName[0];
915 len = le32_to_cpu(pFindData->FileNameLength);
916 cifsFile->srch_inf.resume_key = pFindData->FileIndex;
917 } else if(level == SMB_FIND_FILE_FULL_DIRECTORY_INFO) {
918 FILE_FULL_DIRECTORY_INFO * pFindData =
919 (FILE_FULL_DIRECTORY_INFO *)current_entry;
920 filename = &pFindData->FileName[0];
921 len = le32_to_cpu(pFindData->FileNameLength);
922 cifsFile->srch_inf.resume_key = pFindData->FileIndex;
923 } else if(level == SMB_FIND_FILE_ID_FULL_DIR_INFO) {
924 SEARCH_ID_FULL_DIR_INFO * pFindData =
925 (SEARCH_ID_FULL_DIR_INFO *)current_entry;
926 filename = &pFindData->FileName[0];
927 len = le32_to_cpu(pFindData->FileNameLength);
928 cifsFile->srch_inf.resume_key = pFindData->FileIndex;
929 } else if(level == SMB_FIND_FILE_BOTH_DIRECTORY_INFO) {
930 FILE_BOTH_DIRECTORY_INFO * pFindData =
931 (FILE_BOTH_DIRECTORY_INFO *)current_entry;
932 filename = &pFindData->FileName[0];
933 len = le32_to_cpu(pFindData->FileNameLength);
934 cifsFile->srch_inf.resume_key = pFindData->FileIndex;
935 } else if(level == SMB_FIND_FILE_INFO_STANDARD) {
936 FIND_FILE_STANDARD_INFO * pFindData =
937 (FIND_FILE_STANDARD_INFO *)current_entry;
938 filename = &pFindData->FileName[0];
939 /* one byte length, no name conversion */
940 len = (unsigned int)pFindData->FileNameLength;
941 } else {
942 cFYI(1,("Unknown findfirst level %d",level));
943 return -EINVAL;
944 }
945 cifsFile->srch_inf.resume_name_len = len;
946 cifsFile->srch_inf.presume_name = filename;
947 return rc;
948 }
949
950 int cifs_readdir(struct file *file, void *direntry, filldir_t filldir)
951 {
952 int rc = 0;
953 int xid,i;
954 struct cifs_sb_info *cifs_sb;
955 struct cifsTconInfo *pTcon;
956 struct cifsFileInfo *cifsFile = NULL;
957 char * current_entry;
958 int num_to_fill = 0;
959 char * tmp_buf = NULL;
960 char * end_of_smb;
961 int max_len;
962
963 xid = GetXid();
964
965 if(file->f_dentry == NULL) {
966 FreeXid(xid);
967 return -EIO;
968 }
969
970 cifs_sb = CIFS_SB(file->f_dentry->d_sb);
971 pTcon = cifs_sb->tcon;
972 if(pTcon == NULL)
973 return -EINVAL;
974
975 switch ((int) file->f_pos) {
976 case 0:
977 if (filldir(direntry, ".", 1, file->f_pos,
978 file->f_dentry->d_inode->i_ino, DT_DIR) < 0) {
979 cERROR(1, ("Filldir for current dir failed"));
980 rc = -ENOMEM;
981 break;
982 }
983 file->f_pos++;
984 case 1:
985 if (filldir(direntry, "..", 2, file->f_pos,
986 file->f_dentry->d_parent->d_inode->i_ino, DT_DIR) < 0) {
987 cERROR(1, ("Filldir for parent dir failed"));
988 rc = -ENOMEM;
989 break;
990 }
991 file->f_pos++;
992 default:
993 /* 1) If search is active,
994 is in current search buffer?
995 if it before then restart search
996 if after then keep searching till find it */
997
998 if(file->private_data == NULL) {
999 rc = initiate_cifs_search(xid,file);
1000 cFYI(1,("initiate cifs search rc %d",rc));
1001 if(rc) {
1002 FreeXid(xid);
1003 return rc;
1004 }
1005 }
1006 if(file->private_data == NULL) {
1007 rc = -EINVAL;
1008 FreeXid(xid);
1009 return rc;
1010 }
1011 cifsFile = file->private_data;
1012 if (cifsFile->srch_inf.endOfSearch) {
1013 if(cifsFile->srch_inf.emptyDir) {
1014 cFYI(1, ("End of search, empty dir"));
1015 rc = 0;
1016 break;
1017 }
1018 } /* else {
1019 cifsFile->invalidHandle = TRUE;
1020 CIFSFindClose(xid, pTcon, cifsFile->netfid);
1021 }
1022 kfree(cifsFile->search_resume_name);
1023 cifsFile->search_resume_name = NULL; */
1024
1025 rc = find_cifs_entry(xid,pTcon, file,
1026 &current_entry,&num_to_fill);
1027 if(rc) {
1028 cFYI(1,("fce error %d",rc));
1029 goto rddir2_exit;
1030 } else if (current_entry != NULL) {
1031 cFYI(1,("entry %lld found",file->f_pos));
1032 } else {
1033 cFYI(1,("could not find entry"));
1034 goto rddir2_exit;
1035 }
1036 cFYI(1,("loop through %d times filling dir for net buf %p",
1037 num_to_fill,cifsFile->srch_inf.ntwrk_buf_start));
1038 max_len = smbCalcSize((struct smb_hdr *)
1039 cifsFile->srch_inf.ntwrk_buf_start);
1040 end_of_smb = cifsFile->srch_inf.ntwrk_buf_start + max_len;
1041
1042 /* To be safe - for UCS to UTF-8 with strings loaded
1043 with the rare long characters alloc more to account for
1044 such multibyte target UTF-8 characters. cifs_unicode.c,
1045 which actually does the conversion, has the same limit */
1046 tmp_buf = kmalloc((2 * NAME_MAX) + 4, GFP_KERNEL);
1047 for(i=0;(i<num_to_fill) && (rc == 0);i++) {
1048 if(current_entry == NULL) {
1049 /* evaluate whether this case is an error */
1050 cERROR(1,("past end of SMB num to fill %d i %d",
1051 num_to_fill, i));
1052 break;
1053 }
1054 /* if buggy server returns . and .. late do
1055 we want to check for that here? */
1056 rc = cifs_filldir(current_entry, file,
1057 filldir, direntry, tmp_buf, max_len);
1058 file->f_pos++;
1059 if(file->f_pos ==
1060 cifsFile->srch_inf.index_of_last_entry) {
1061 cFYI(1,("last entry in buf at pos %lld %s",
1062 file->f_pos,tmp_buf));
1063 cifs_save_resume_key(current_entry,cifsFile);
1064 break;
1065 } else
1066 current_entry =
1067 nxt_dir_entry(current_entry, end_of_smb,
1068 cifsFile->srch_inf.info_level);
1069 }
1070 kfree(tmp_buf);
1071 break;
1072 } /* end switch */
1073
1074 rddir2_exit:
1075 FreeXid(xid);
1076 return rc;
1077 }
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