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[PATCH] cifs: Fix caching problem
[linux-2.6/linux-loongson.git] / fs / cifs / readdir.c
blob39170cffcad8289a1ca92283aa6435c33b20f0e5
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 tmp_dentry->d_op = &cifs_dentry_ops;
95 if(*ptmp_inode == NULL)
96 return rc;
97 rc = 1;
98 d_instantiate(tmp_dentry, *ptmp_inode);
99 d_rehash(tmp_dentry);
100 }
101
102 tmp_dentry->d_time = jiffies;
103 *pnew_dentry = tmp_dentry;
104 return rc;
105 }
106
107 static void fill_in_inode(struct inode *tmp_inode,
108 FILE_DIRECTORY_INFO *pfindData, int *pobject_type, int isNewInode)
109 {
110 loff_t local_size;
111 struct timespec local_mtime;
112
113 struct cifsInodeInfo *cifsInfo = CIFS_I(tmp_inode);
114 struct cifs_sb_info *cifs_sb = CIFS_SB(tmp_inode->i_sb);
115 __u32 attr = le32_to_cpu(pfindData->ExtFileAttributes);
116 __u64 allocation_size = le64_to_cpu(pfindData->AllocationSize);
117 __u64 end_of_file = le64_to_cpu(pfindData->EndOfFile);
118
119 cifsInfo->cifsAttrs = attr;
120 cifsInfo->time = jiffies;
121
122 /* save mtime and size */
123 local_mtime = tmp_inode->i_mtime;
124 local_size = tmp_inode->i_size;
125
126 /* Linux can not store file creation time unfortunately so ignore it */
127 tmp_inode->i_atime =
128 cifs_NTtimeToUnix(le64_to_cpu(pfindData->LastAccessTime));
129 tmp_inode->i_mtime =
130 cifs_NTtimeToUnix(le64_to_cpu(pfindData->LastWriteTime));
131 tmp_inode->i_ctime =
132 cifs_NTtimeToUnix(le64_to_cpu(pfindData->ChangeTime));
133 /* treat dos attribute of read-only as read-only mode bit e.g. 555? */
134 /* 2767 perms - indicate mandatory locking */
135 /* BB fill in uid and gid here? with help from winbind?
136 or retrieve from NTFS stream extended attribute */
137 if (atomic_read(&cifsInfo->inUse) == 0) {
138 tmp_inode->i_uid = cifs_sb->mnt_uid;
139 tmp_inode->i_gid = cifs_sb->mnt_gid;
140 /* set default mode. will override for dirs below */
141 tmp_inode->i_mode = cifs_sb->mnt_file_mode;
142 }
143
144 if (attr & ATTR_DIRECTORY) {
145 *pobject_type = DT_DIR;
146 /* override default perms since we do not lock dirs */
147 if(atomic_read(&cifsInfo->inUse) == 0) {
148 tmp_inode->i_mode = cifs_sb->mnt_dir_mode;
149 }
150 tmp_inode->i_mode |= S_IFDIR;
151 /* we no longer mark these because we could not follow them */
152 /* } else if (attr & ATTR_REPARSE) {
153 *pobject_type = DT_LNK;
154 tmp_inode->i_mode |= S_IFLNK; */
155 } else {
156 *pobject_type = DT_REG;
157 tmp_inode->i_mode |= S_IFREG;
158 if (attr & ATTR_READONLY)
159 tmp_inode->i_mode &= ~(S_IWUGO);
160 } /* could add code here - to validate if device or weird share type? */
161
162 /* can not fill in nlink here as in qpathinfo version and Unx search */
163 if (atomic_read(&cifsInfo->inUse) == 0) {
164 atomic_set(&cifsInfo->inUse, 1);
165 }
166
167 if (is_size_safe_to_change(cifsInfo)) {
168 /* can not safely change the file size here if the
169 client is writing to it due to potential races */
170 i_size_write(tmp_inode, end_of_file);
171
172 /* 512 bytes (2**9) is the fake blocksize that must be used */
173 /* for this calculation, even though the reported blocksize is larger */
174 tmp_inode->i_blocks = (512 - 1 + allocation_size) >> 9;
175 }
176
177 if (allocation_size < end_of_file)
178 cFYI(1, ("May be sparse file, allocation less than file size"));
179 cFYI(1,
180 ("File Size %ld and blocks %ld and blocksize %ld",
181 (unsigned long)tmp_inode->i_size, tmp_inode->i_blocks,
182 tmp_inode->i_blksize));
183 if (S_ISREG(tmp_inode->i_mode)) {
184 cFYI(1, ("File inode"));
185 tmp_inode->i_op = &cifs_file_inode_ops;
186 if(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DIRECT_IO)
187 tmp_inode->i_fop = &cifs_file_direct_ops;
188 else
189 tmp_inode->i_fop = &cifs_file_ops;
190 tmp_inode->i_data.a_ops = &cifs_addr_ops;
191
192 if(isNewInode)
193 return; /* No sense invalidating pages for new inode since we
194 have not started caching readahead file data yet */
195
196 if (timespec_equal(&tmp_inode->i_mtime, &local_mtime) &&
197 (local_size == tmp_inode->i_size)) {
198 cFYI(1, ("inode exists but unchanged"));
199 } else {
200 /* file may have changed on server */
201 cFYI(1, ("invalidate inode, readdir detected change"));
202 invalidate_remote_inode(tmp_inode);
203 }
204 } else if (S_ISDIR(tmp_inode->i_mode)) {
205 cFYI(1, ("Directory inode"));
206 tmp_inode->i_op = &cifs_dir_inode_ops;
207 tmp_inode->i_fop = &cifs_dir_ops;
208 } else if (S_ISLNK(tmp_inode->i_mode)) {
209 cFYI(1, ("Symbolic Link inode"));
210 tmp_inode->i_op = &cifs_symlink_inode_ops;
211 } else {
212 cFYI(1, ("Init special inode"));
213 init_special_inode(tmp_inode, tmp_inode->i_mode,
214 tmp_inode->i_rdev);
215 }
216 }
217
218 static void unix_fill_in_inode(struct inode *tmp_inode,
219 FILE_UNIX_INFO *pfindData, int *pobject_type, int isNewInode)
220 {
221 loff_t local_size;
222 struct timespec local_mtime;
223
224 struct cifsInodeInfo *cifsInfo = CIFS_I(tmp_inode);
225 struct cifs_sb_info *cifs_sb = CIFS_SB(tmp_inode->i_sb);
226
227 __u32 type = le32_to_cpu(pfindData->Type);
228 __u64 num_of_bytes = le64_to_cpu(pfindData->NumOfBytes);
229 __u64 end_of_file = le64_to_cpu(pfindData->EndOfFile);
230 cifsInfo->time = jiffies;
231 atomic_inc(&cifsInfo->inUse);
232
233 /* save mtime and size */
234 local_mtime = tmp_inode->i_mtime;
235 local_size = tmp_inode->i_size;
236
237 tmp_inode->i_atime =
238 cifs_NTtimeToUnix(le64_to_cpu(pfindData->LastAccessTime));
239 tmp_inode->i_mtime =
240 cifs_NTtimeToUnix(le64_to_cpu(pfindData->LastModificationTime));
241 tmp_inode->i_ctime =
242 cifs_NTtimeToUnix(le64_to_cpu(pfindData->LastStatusChange));
243
244 tmp_inode->i_mode = le64_to_cpu(pfindData->Permissions);
245 if (type == UNIX_FILE) {
246 *pobject_type = DT_REG;
247 tmp_inode->i_mode |= S_IFREG;
248 } else if (type == UNIX_SYMLINK) {
249 *pobject_type = DT_LNK;
250 tmp_inode->i_mode |= S_IFLNK;
251 } else if (type == UNIX_DIR) {
252 *pobject_type = DT_DIR;
253 tmp_inode->i_mode |= S_IFDIR;
254 } else if (type == UNIX_CHARDEV) {
255 *pobject_type = DT_CHR;
256 tmp_inode->i_mode |= S_IFCHR;
257 tmp_inode->i_rdev = MKDEV(le64_to_cpu(pfindData->DevMajor),
258 le64_to_cpu(pfindData->DevMinor) & MINORMASK);
259 } else if (type == UNIX_BLOCKDEV) {
260 *pobject_type = DT_BLK;
261 tmp_inode->i_mode |= S_IFBLK;
262 tmp_inode->i_rdev = MKDEV(le64_to_cpu(pfindData->DevMajor),
263 le64_to_cpu(pfindData->DevMinor) & MINORMASK);
264 } else if (type == UNIX_FIFO) {
265 *pobject_type = DT_FIFO;
266 tmp_inode->i_mode |= S_IFIFO;
267 } else if (type == UNIX_SOCKET) {
268 *pobject_type = DT_SOCK;
269 tmp_inode->i_mode |= S_IFSOCK;
270 }
271
272 tmp_inode->i_uid = le64_to_cpu(pfindData->Uid);
273 tmp_inode->i_gid = le64_to_cpu(pfindData->Gid);
274 tmp_inode->i_nlink = le64_to_cpu(pfindData->Nlinks);
275
276 if (is_size_safe_to_change(cifsInfo)) {
277 /* can not safely change the file size here if the
278 client is writing to it due to potential races */
279 i_size_write(tmp_inode,end_of_file);
280
281 /* 512 bytes (2**9) is the fake blocksize that must be used */
282 /* for this calculation, not the real blocksize */
283 tmp_inode->i_blocks = (512 - 1 + num_of_bytes) >> 9;
284 }
285
286 if (S_ISREG(tmp_inode->i_mode)) {
287 cFYI(1, ("File inode"));
288 tmp_inode->i_op = &cifs_file_inode_ops;
289 if(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DIRECT_IO)
290 tmp_inode->i_fop = &cifs_file_direct_ops;
291 else
292 tmp_inode->i_fop = &cifs_file_ops;
293 tmp_inode->i_data.a_ops = &cifs_addr_ops;
294
295 if(isNewInode)
296 return; /* No sense invalidating pages for new inode since we
297 have not started caching readahead file data yet */
298
299 if (timespec_equal(&tmp_inode->i_mtime, &local_mtime) &&
300 (local_size == tmp_inode->i_size)) {
301 cFYI(1, ("inode exists but unchanged"));
302 } else {
303 /* file may have changed on server */
304 cFYI(1, ("invalidate inode, readdir detected change"));
305 invalidate_remote_inode(tmp_inode);
306 }
307 } else if (S_ISDIR(tmp_inode->i_mode)) {
308 cFYI(1, ("Directory inode"));
309 tmp_inode->i_op = &cifs_dir_inode_ops;
310 tmp_inode->i_fop = &cifs_dir_ops;
311 } else if (S_ISLNK(tmp_inode->i_mode)) {
312 cFYI(1, ("Symbolic Link inode"));
313 tmp_inode->i_op = &cifs_symlink_inode_ops;
314 /* tmp_inode->i_fop = *//* do not need to set to anything */
315 } else {
316 cFYI(1, ("Special inode"));
317 init_special_inode(tmp_inode, tmp_inode->i_mode,
318 tmp_inode->i_rdev);
319 }
320 }
321
322 static int initiate_cifs_search(const int xid, struct file *file)
323 {
324 int rc = 0;
325 char * full_path;
326 struct cifsFileInfo * cifsFile;
327 struct cifs_sb_info *cifs_sb;
328 struct cifsTconInfo *pTcon;
329
330 if(file->private_data == NULL) {
331 file->private_data =
332 kmalloc(sizeof(struct cifsFileInfo),GFP_KERNEL);
333 }
334
335 if(file->private_data == NULL) {
336 return -ENOMEM;
337 } else {
338 memset(file->private_data,0,sizeof(struct cifsFileInfo));
339 }
340 cifsFile = file->private_data;
341 cifsFile->invalidHandle = TRUE;
342 cifsFile->srch_inf.endOfSearch = FALSE;
343
344 if(file->f_dentry == NULL)
345 return -ENOENT;
346
347 cifs_sb = CIFS_SB(file->f_dentry->d_sb);
348 if(cifs_sb == NULL)
349 return -EINVAL;
350
351 pTcon = cifs_sb->tcon;
352 if(pTcon == NULL)
353 return -EINVAL;
354
355 down(&file->f_dentry->d_sb->s_vfs_rename_sem);
356 full_path = build_path_from_dentry(file->f_dentry);
357 up(&file->f_dentry->d_sb->s_vfs_rename_sem);
358
359 if(full_path == NULL) {
360 return -ENOMEM;
361 }
362
363 cFYI(1, ("Full path: %s start at: %lld", full_path, file->f_pos));
364
365 ffirst_retry:
366 /* test for Unix extensions */
367 if (pTcon->ses->capabilities & CAP_UNIX) {
368 cifsFile->srch_inf.info_level = SMB_FIND_FILE_UNIX;
369 } else if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM) {
370 cifsFile->srch_inf.info_level = SMB_FIND_FILE_ID_FULL_DIR_INFO;
371 } else /* not srvinos - BB fixme add check for backlevel? */ {
372 cifsFile->srch_inf.info_level = SMB_FIND_FILE_DIRECTORY_INFO;
373 }
374
375 rc = CIFSFindFirst(xid, pTcon,full_path,cifs_sb->local_nls,
376 &cifsFile->netfid, &cifsFile->srch_inf,
377 cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR);
378 if(rc == 0)
379 cifsFile->invalidHandle = FALSE;
380 if((rc == -EOPNOTSUPP) &&
381 (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM)) {
382 cifs_sb->mnt_cifs_flags &= ~CIFS_MOUNT_SERVER_INUM;
383 goto ffirst_retry;
384 }
385 kfree(full_path);
386 return rc;
387 }
388
389 /* return length of unicode string in bytes */
390 static int cifs_unicode_bytelen(char *str)
391 {
392 int len;
393 __le16 * ustr = (__le16 *)str;
394
395 for(len=0;len <= PATH_MAX;len++) {
396 if(ustr[len] == 0)
397 return len << 1;
398 }
399 cFYI(1,("Unicode string longer than PATH_MAX found"));
400 return len << 1;
401 }
402
403 static char *nxt_dir_entry(char *old_entry, char *end_of_smb)
404 {
405 char * new_entry;
406 FILE_DIRECTORY_INFO * pDirInfo = (FILE_DIRECTORY_INFO *)old_entry;
407
408 new_entry = old_entry + le32_to_cpu(pDirInfo->NextEntryOffset);
409 cFYI(1,("new entry %p old entry %p",new_entry,old_entry));
410 /* validate that new_entry is not past end of SMB */
411 if(new_entry >= end_of_smb) {
412 cFYI(1,("search entry %p began after end of SMB %p old entry %p",
413 new_entry,end_of_smb,old_entry));
414 return NULL;
415 } else
416 return new_entry;
417
418 }
419
420 #define UNICODE_DOT cpu_to_le16(0x2e)
421
422 /* return 0 if no match and 1 for . (current directory) and 2 for .. (parent) */
423 static int cifs_entry_is_dot(char *current_entry, struct cifsFileInfo *cfile)
424 {
425 int rc = 0;
426 char * filename = NULL;
427 int len = 0;
428
429 if(cfile->srch_inf.info_level == 0x202) {
430 FILE_UNIX_INFO * pFindData = (FILE_UNIX_INFO *)current_entry;
431 filename = &pFindData->FileName[0];
432 if(cfile->srch_inf.unicode) {
433 len = cifs_unicode_bytelen(filename);
434 } else {
435 /* BB should we make this strnlen of PATH_MAX? */
436 len = strnlen(filename, 5);
437 }
438 } else if(cfile->srch_inf.info_level == 0x101) {
439 FILE_DIRECTORY_INFO * pFindData =
440 (FILE_DIRECTORY_INFO *)current_entry;
441 filename = &pFindData->FileName[0];
442 len = le32_to_cpu(pFindData->FileNameLength);
443 } else if(cfile->srch_inf.info_level == 0x102) {
444 FILE_FULL_DIRECTORY_INFO * pFindData =
445 (FILE_FULL_DIRECTORY_INFO *)current_entry;
446 filename = &pFindData->FileName[0];
447 len = le32_to_cpu(pFindData->FileNameLength);
448 } else if(cfile->srch_inf.info_level == 0x105) {
449 SEARCH_ID_FULL_DIR_INFO * pFindData =
450 (SEARCH_ID_FULL_DIR_INFO *)current_entry;
451 filename = &pFindData->FileName[0];
452 len = le32_to_cpu(pFindData->FileNameLength);
453 } else if(cfile->srch_inf.info_level == 0x104) {
454 FILE_BOTH_DIRECTORY_INFO * pFindData =
455 (FILE_BOTH_DIRECTORY_INFO *)current_entry;
456 filename = &pFindData->FileName[0];
457 len = le32_to_cpu(pFindData->FileNameLength);
458 } else {
459 cFYI(1,("Unknown findfirst level %d",cfile->srch_inf.info_level));
460 }
461
462 if(filename) {
463 if(cfile->srch_inf.unicode) {
464 __le16 *ufilename = (__le16 *)filename;
465 if(len == 2) {
466 /* check for . */
467 if(ufilename[0] == UNICODE_DOT)
468 rc = 1;
469 } else if(len == 4) {
470 /* check for .. */
471 if((ufilename[0] == UNICODE_DOT)
472 &&(ufilename[1] == UNICODE_DOT))
473 rc = 2;
474 }
475 } else /* ASCII */ {
476 if(len == 1) {
477 if(filename[0] == '.')
478 rc = 1;
479 } else if(len == 2) {
480 if((filename[0] == '.') && (filename[1] == '.'))
481 rc = 2;
482 }
483 }
484 }
485
486 return rc;
487 }
488
489 /* find the corresponding entry in the search */
490 /* Note that the SMB server returns search entries for . and .. which
491 complicates logic here if we choose to parse for them and we do not
492 assume that they are located in the findfirst return buffer.*/
493 /* We start counting in the buffer with entry 2 and increment for every
494 entry (do not increment for . or .. entry) */
495 static int find_cifs_entry(const int xid, struct cifsTconInfo *pTcon,
496 struct file *file, char **ppCurrentEntry, int *num_to_ret)
497 {
498 int rc = 0;
499 int pos_in_buf = 0;
500 loff_t first_entry_in_buffer;
501 loff_t index_to_find = file->f_pos;
502 struct cifsFileInfo * cifsFile = file->private_data;
503 /* check if index in the buffer */
504
505 if((cifsFile == NULL) || (ppCurrentEntry == NULL) || (num_to_ret == NULL))
506 return -ENOENT;
507
508 *ppCurrentEntry = NULL;
509 first_entry_in_buffer =
510 cifsFile->srch_inf.index_of_last_entry -
511 cifsFile->srch_inf.entries_in_buffer;
512 /* dump_cifs_file_struct(file, "In fce ");*/
513 if(index_to_find < first_entry_in_buffer) {
514 /* close and restart search */
515 cFYI(1,("search backing up - close and restart search"));
516 cifsFile->invalidHandle = TRUE;
517 CIFSFindClose(xid, pTcon, cifsFile->netfid);
518 kfree(cifsFile->search_resume_name);
519 cifsFile->search_resume_name = NULL;
520 if(cifsFile->srch_inf.ntwrk_buf_start) {
521 cFYI(1,("freeing SMB ff cache buf on search rewind"));
522 cifs_buf_release(cifsFile->srch_inf.ntwrk_buf_start);
523 }
524 rc = initiate_cifs_search(xid,file);
525 if(rc) {
526 cFYI(1,("error %d reinitiating a search on rewind",rc));
527 return rc;
528 }
529 }
530
531 while((index_to_find >= cifsFile->srch_inf.index_of_last_entry) &&
532 (rc == 0) && (cifsFile->srch_inf.endOfSearch == FALSE)){
533 cFYI(1,("calling findnext2"));
534 rc = CIFSFindNext(xid,pTcon,cifsFile->netfid, &cifsFile->srch_inf);
535 if(rc)
536 return -ENOENT;
537 }
538 if(index_to_find < cifsFile->srch_inf.index_of_last_entry) {
539 /* we found the buffer that contains the entry */
540 /* scan and find it */
541 int i;
542 char * current_entry;
543 char * end_of_smb = cifsFile->srch_inf.ntwrk_buf_start +
544 smbCalcSize((struct smb_hdr *)
545 cifsFile->srch_inf.ntwrk_buf_start);
546 /* dump_cifs_file_struct(file,"found entry in fce "); */
547 first_entry_in_buffer = cifsFile->srch_inf.index_of_last_entry
548 - cifsFile->srch_inf.entries_in_buffer;
549 pos_in_buf = index_to_find - first_entry_in_buffer;
550 cFYI(1,("found entry - pos_in_buf %d",pos_in_buf));
551 current_entry = cifsFile->srch_inf.srch_entries_start;
552 for(i=0;(i<(pos_in_buf)) && (current_entry != NULL);i++) {
553 /* go entry to next entry figuring out which we need to start with */
554 /* if( . or ..)
555 skip */
556 rc = cifs_entry_is_dot(current_entry,cifsFile);
557 if(rc == 1) /* is . or .. so skip */ {
558 cFYI(1,("Entry is .")); /* BB removeme BB */
559 /* continue; */
560 } else if (rc == 2 ) {
561 cFYI(1,("Entry is ..")); /* BB removeme BB */
562 /* continue; */
563 }
564 current_entry = nxt_dir_entry(current_entry,end_of_smb);
565 }
566 if((current_entry == NULL) && (i < pos_in_buf)) {
567 /* BB fixme - check if we should flag this error */
568 cERROR(1,("reached end of buf searching for pos in buf"
569 " %d index to find %lld rc %d",
570 pos_in_buf,index_to_find,rc));
571 }
572 rc = 0;
573 *ppCurrentEntry = current_entry;
574 } else {
575 cFYI(1,("index not in buffer - could not findnext into it"));
576 return 0;
577 }
578
579 if(pos_in_buf >= cifsFile->srch_inf.entries_in_buffer) {
580 cFYI(1,("can not return entries when pos_in_buf beyond last entry"));
581 *num_to_ret = 0;
582 } else
583 *num_to_ret = cifsFile->srch_inf.entries_in_buffer - pos_in_buf;
584 /* dump_cifs_file_struct(file, "end fce ");*/
585
586 return rc;
587 }
588
589 /* inode num, inode type and filename returned */
590 static int cifs_get_name_from_search_buf(struct qstr *pqst,
591 char *current_entry, __u16 level, unsigned int unicode,
592 struct cifs_sb_info * cifs_sb, ino_t *pinum)
593 {
594 int rc = 0;
595 unsigned int len = 0;
596 char * filename;
597 struct nls_table * nlt = cifs_sb->local_nls;
598
599 *pinum = 0;
600
601 if(level == SMB_FIND_FILE_UNIX) {
602 FILE_UNIX_INFO * pFindData = (FILE_UNIX_INFO *)current_entry;
603
604 filename = &pFindData->FileName[0];
605 if(unicode) {
606 len = cifs_unicode_bytelen(filename);
607 } else {
608 /* BB should we make this strnlen of PATH_MAX? */
609 len = strnlen(filename, PATH_MAX);
610 }
611
612 /* BB fixme - hash low and high 32 bits if not 64 bit arch BB fixme */
613 if(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM)
614 *pinum = pFindData->UniqueId;
615 } else if(level == SMB_FIND_FILE_DIRECTORY_INFO) {
616 FILE_DIRECTORY_INFO * pFindData =
617 (FILE_DIRECTORY_INFO *)current_entry;
618 filename = &pFindData->FileName[0];
619 len = le32_to_cpu(pFindData->FileNameLength);
620 } else if(level == SMB_FIND_FILE_FULL_DIRECTORY_INFO) {
621 FILE_FULL_DIRECTORY_INFO * pFindData =
622 (FILE_FULL_DIRECTORY_INFO *)current_entry;
623 filename = &pFindData->FileName[0];
624 len = le32_to_cpu(pFindData->FileNameLength);
625 } else if(level == SMB_FIND_FILE_ID_FULL_DIR_INFO) {
626 SEARCH_ID_FULL_DIR_INFO * pFindData =
627 (SEARCH_ID_FULL_DIR_INFO *)current_entry;
628 filename = &pFindData->FileName[0];
629 len = le32_to_cpu(pFindData->FileNameLength);
630 *pinum = pFindData->UniqueId;
631 } else if(level == SMB_FIND_FILE_BOTH_DIRECTORY_INFO) {
632 FILE_BOTH_DIRECTORY_INFO * pFindData =
633 (FILE_BOTH_DIRECTORY_INFO *)current_entry;
634 filename = &pFindData->FileName[0];
635 len = le32_to_cpu(pFindData->FileNameLength);
636 } else {
637 cFYI(1,("Unknown findfirst level %d",level));
638 return -EINVAL;
639 }
640 if(unicode) {
641 /* BB fixme - test with long names */
642 /* Note converted filename can be longer than in unicode */
643 if(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR)
644 pqst->len = cifs_convertUCSpath((char *)pqst->name,
645 (__le16 *)filename, len/2, nlt);
646 else
647 pqst->len = cifs_strfromUCS_le((char *)pqst->name,
648 (wchar_t *)filename,len/2,nlt);
649 } else {
650 pqst->name = filename;
651 pqst->len = len;
652 }
653 pqst->hash = full_name_hash(pqst->name,pqst->len);
654 /* cFYI(1,("filldir on %s",pqst->name)); */
655 return rc;
656 }
657
658 static int cifs_filldir(char *pfindEntry, struct file *file,
659 filldir_t filldir, void *direntry, char *scratch_buf)
660 {
661 int rc = 0;
662 struct qstr qstring;
663 struct cifsFileInfo * pCifsF;
664 unsigned obj_type;
665 ino_t inum;
666 struct cifs_sb_info * cifs_sb;
667 struct inode *tmp_inode;
668 struct dentry *tmp_dentry;
669
670 /* get filename and len into qstring */
671 /* get dentry */
672 /* decide whether to create and populate ionde */
673 if((direntry == NULL) || (file == NULL))
674 return -EINVAL;
675
676 pCifsF = file->private_data;
677
678 if((scratch_buf == NULL) || (pfindEntry == NULL) || (pCifsF == NULL))
679 return -ENOENT;
680
681 if(file->f_dentry == NULL)
682 return -ENOENT;
683
684 cifs_sb = CIFS_SB(file->f_dentry->d_sb);
685
686 qstring.name = scratch_buf;
687 rc = cifs_get_name_from_search_buf(&qstring,pfindEntry,
688 pCifsF->srch_inf.info_level,
689 pCifsF->srch_inf.unicode,cifs_sb,
690 &inum /* returned */);
691
692 if(rc)
693 return rc;
694
695 rc = construct_dentry(&qstring,file,&tmp_inode, &tmp_dentry);
696 if((tmp_inode == NULL) || (tmp_dentry == NULL))
697 return -ENOMEM;
698
699 if(rc) {
700 /* inode created, we need to hash it with right inode number */
701 if(inum != 0) {
702 /* BB fixme - hash the 2 32 quantities bits together if necessary BB */
703 tmp_inode->i_ino = inum;
704 }
705 insert_inode_hash(tmp_inode);
706 }
707
708 /* we pass in rc below, indicating whether it is a new inode,
709 so we can figure out whether to invalidate the inode cached
710 data if the file has changed */
711 if(pCifsF->srch_inf.info_level == SMB_FIND_FILE_UNIX) {
712 unix_fill_in_inode(tmp_inode,
713 (FILE_UNIX_INFO *)pfindEntry,&obj_type, rc);
714 } else {
715 fill_in_inode(tmp_inode,
716 (FILE_DIRECTORY_INFO *)pfindEntry,&obj_type, rc);
717 }
718
719 rc = filldir(direntry,qstring.name,qstring.len,file->f_pos,tmp_inode->i_ino,obj_type);
720 if(rc) {
721 cFYI(1,("filldir rc = %d",rc));
722 }
723
724 dput(tmp_dentry);
725 return rc;
726 }
727
728 static int cifs_save_resume_key(const char *current_entry,
729 struct cifsFileInfo *cifsFile)
730 {
731 int rc = 0;
732 unsigned int len = 0;
733 __u16 level;
734 char * filename;
735
736 if((cifsFile == NULL) || (current_entry == NULL))
737 return -EINVAL;
738
739 level = cifsFile->srch_inf.info_level;
740
741 if(level == SMB_FIND_FILE_UNIX) {
742 FILE_UNIX_INFO * pFindData = (FILE_UNIX_INFO *)current_entry;
743
744 filename = &pFindData->FileName[0];
745 if(cifsFile->srch_inf.unicode) {
746 len = cifs_unicode_bytelen(filename);
747 } else {
748 /* BB should we make this strnlen of PATH_MAX? */
749 len = strnlen(filename, PATH_MAX);
750 }
751 cifsFile->srch_inf.resume_key = pFindData->ResumeKey;
752 } else if(level == SMB_FIND_FILE_DIRECTORY_INFO) {
753 FILE_DIRECTORY_INFO * pFindData =
754 (FILE_DIRECTORY_INFO *)current_entry;
755 filename = &pFindData->FileName[0];
756 len = le32_to_cpu(pFindData->FileNameLength);
757 cifsFile->srch_inf.resume_key = pFindData->FileIndex;
758 } else if(level == SMB_FIND_FILE_FULL_DIRECTORY_INFO) {
759 FILE_FULL_DIRECTORY_INFO * pFindData =
760 (FILE_FULL_DIRECTORY_INFO *)current_entry;
761 filename = &pFindData->FileName[0];
762 len = le32_to_cpu(pFindData->FileNameLength);
763 cifsFile->srch_inf.resume_key = pFindData->FileIndex;
764 } else if(level == SMB_FIND_FILE_ID_FULL_DIR_INFO) {
765 SEARCH_ID_FULL_DIR_INFO * pFindData =
766 (SEARCH_ID_FULL_DIR_INFO *)current_entry;
767 filename = &pFindData->FileName[0];
768 len = le32_to_cpu(pFindData->FileNameLength);
769 cifsFile->srch_inf.resume_key = pFindData->FileIndex;
770 } else if(level == SMB_FIND_FILE_BOTH_DIRECTORY_INFO) {
771 FILE_BOTH_DIRECTORY_INFO * pFindData =
772 (FILE_BOTH_DIRECTORY_INFO *)current_entry;
773 filename = &pFindData->FileName[0];
774 len = le32_to_cpu(pFindData->FileNameLength);
775 cifsFile->srch_inf.resume_key = pFindData->FileIndex;
776 } else {
777 cFYI(1,("Unknown findfirst level %d",level));
778 return -EINVAL;
779 }
780 cifsFile->srch_inf.resume_name_len = len;
781 cifsFile->srch_inf.presume_name = filename;
782 return rc;
783 }
784
785 int cifs_readdir(struct file *file, void *direntry, filldir_t filldir)
786 {
787 int rc = 0;
788 int xid,i;
789 struct cifs_sb_info *cifs_sb;
790 struct cifsTconInfo *pTcon;
791 struct cifsFileInfo *cifsFile = NULL;
792 char * current_entry;
793 int num_to_fill = 0;
794 char * tmp_buf = NULL;
795 char * end_of_smb;
796
797 xid = GetXid();
798
799 if(file->f_dentry == NULL) {
800 FreeXid(xid);
801 return -EIO;
802 }
803 /* dump_cifs_file_struct(file, "Begin rdir "); */
804
805 cifs_sb = CIFS_SB(file->f_dentry->d_sb);
806 pTcon = cifs_sb->tcon;
807 if(pTcon == NULL)
808 return -EINVAL;
809
810 /* cFYI(1,("readdir2 pos: %lld",file->f_pos)); */
811
812 switch ((int) file->f_pos) {
813 case 0:
814 /*if (filldir(direntry, ".", 1, file->f_pos,
815 file->f_dentry->d_inode->i_ino, DT_DIR) < 0) {
816 cERROR(1, ("Filldir for current dir failed "));
817 rc = -ENOMEM;
818 break;
819 }
820 file->f_pos++; */
821 case 1:
822 /* if (filldir(direntry, "..", 2, file->f_pos,
823 file->f_dentry->d_parent->d_inode->i_ino, DT_DIR) < 0) {
824 cERROR(1, ("Filldir for parent dir failed "));
825 rc = -ENOMEM;
826 break;
827 }
828 file->f_pos++; */
829 case 2:
830 /* 1) If search is active,
831 is in current search buffer?
832 if it before then restart search
833 if after then keep searching till find it */
834
835 if(file->private_data == NULL) {
836 rc = initiate_cifs_search(xid,file);
837 cFYI(1,("initiate cifs search rc %d",rc));
838 if(rc) {
839 FreeXid(xid);
840 return rc;
841 }
842 }
843 default:
844 if(file->private_data == NULL) {
845 rc = -EINVAL;
846 FreeXid(xid);
847 return rc;
848 }
849 cifsFile = file->private_data;
850 if (cifsFile->srch_inf.endOfSearch) {
851 if(cifsFile->srch_inf.emptyDir) {
852 cFYI(1, ("End of search, empty dir"));
853 rc = 0;
854 break;
855 }
856 } /* else {
857 cifsFile->invalidHandle = TRUE;
858 CIFSFindClose(xid, pTcon, cifsFile->netfid);
859 }
860 kfree(cifsFile->search_resume_name);
861 cifsFile->search_resume_name = NULL; */
862
863 /* BB account for . and .. in f_pos as special case */
864 /* dump_cifs_file_struct(file, "rdir after default ");*/
865
866 rc = find_cifs_entry(xid,pTcon, file,
867 &current_entry,&num_to_fill);
868 if(rc) {
869 cFYI(1,("fce error %d",rc));
870 goto rddir2_exit;
871 } else if (current_entry != NULL) {
872 cFYI(1,("entry %lld found",file->f_pos));
873 } else {
874 cFYI(1,("could not find entry"));
875 goto rddir2_exit;
876 }
877 cFYI(1,("loop through %d times filling dir for net buf %p",
878 num_to_fill,cifsFile->srch_inf.ntwrk_buf_start));
879 end_of_smb = cifsFile->srch_inf.ntwrk_buf_start +
880 smbCalcSize((struct smb_hdr *)
881 cifsFile->srch_inf.ntwrk_buf_start);
882 /* To be safe - for UCS to UTF-8 with strings loaded
883 with the rare long characters alloc more to account for
884 such multibyte target UTF-8 characters. cifs_unicode.c,
885 which actually does the conversion, has the same limit */
886 tmp_buf = kmalloc((2 * NAME_MAX) + 4, GFP_KERNEL);
887 for(i=0;(i<num_to_fill) && (rc == 0);i++) {
888 if(current_entry == NULL) {
889 /* evaluate whether this case is an error */
890 cERROR(1,("past end of SMB num to fill %d i %d",
891 num_to_fill, i));
892 break;
893 }
894
895 rc = cifs_filldir(current_entry, file,
896 filldir, direntry,tmp_buf);
897 file->f_pos++;
898 if(file->f_pos == cifsFile->srch_inf.index_of_last_entry) {
899 cFYI(1,("last entry in buf at pos %lld %s",
900 file->f_pos,tmp_buf)); /* BB removeme BB */
901 cifs_save_resume_key(current_entry,cifsFile);
902 break;
903 } else
904 current_entry = nxt_dir_entry(current_entry,end_of_smb);
905 }
906 kfree(tmp_buf);
907 break;
908 } /* end switch */
909
910 rddir2_exit:
911 /* dump_cifs_file_struct(file, "end rdir "); */
912 FreeXid(xid);
913 return rc;
914 }
linux kernel for loongson