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[DCCP] ackvec: Introduce dccp_ackvec_slab
[linux-2.6/verdex.git] / fs / cifs / readdir.c
blob288cc048d37f1e5b2373c8dd04157bcc90383bcc
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,
201 ("File Size %ld and blocks %ld and blocksize %ld",
202 (unsigned long)tmp_inode->i_size, 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 down(&file->f_dentry->d_sb->s_vfs_rename_sem);
408 full_path = build_path_from_dentry(file->f_dentry);
409 up(&file->f_dentry->d_sb->s_vfs_rename_sem);
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 cifs_buf_release(cifsFile->srch_inf.ntwrk_buf_start);
608 }
609 rc = initiate_cifs_search(xid,file);
610 if(rc) {
611 cFYI(1,("error %d reinitiating a search on rewind",rc));
612 return rc;
613 }
614 }
615
616 while((index_to_find >= cifsFile->srch_inf.index_of_last_entry) &&
617 (rc == 0) && (cifsFile->srch_inf.endOfSearch == FALSE)){
618 cFYI(1,("calling findnext2"));
619 rc = CIFSFindNext(xid,pTcon,cifsFile->netfid,
620 &cifsFile->srch_inf);
621 if(rc)
622 return -ENOENT;
623 }
624 if(index_to_find < cifsFile->srch_inf.index_of_last_entry) {
625 /* we found the buffer that contains the entry */
626 /* scan and find it */
627 int i;
628 char * current_entry;
629 char * end_of_smb = cifsFile->srch_inf.ntwrk_buf_start +
630 smbCalcSize((struct smb_hdr *)
631 cifsFile->srch_inf.ntwrk_buf_start);
632 first_entry_in_buffer = cifsFile->srch_inf.index_of_last_entry
633 - cifsFile->srch_inf.entries_in_buffer;
634 pos_in_buf = index_to_find - first_entry_in_buffer;
635 cFYI(1,("found entry - pos_in_buf %d",pos_in_buf));
636 current_entry = cifsFile->srch_inf.srch_entries_start;
637 for(i=0;(i<(pos_in_buf)) && (current_entry != NULL);i++) {
638 /* go entry by entry figuring out which is first */
639 /* if( . or ..)
640 skip */
641 rc = cifs_entry_is_dot(current_entry,cifsFile);
642 if(rc == 1) /* is . or .. so skip */ {
643 cFYI(1,("Entry is .")); /* BB removeme BB */
644 /* continue; */
645 } else if (rc == 2 ) {
646 cFYI(1,("Entry is ..")); /* BB removeme BB */
647 /* continue; */
648 }
649 current_entry = nxt_dir_entry(current_entry,end_of_smb);
650 }
651 if((current_entry == NULL) && (i < pos_in_buf)) {
652 /* BB fixme - check if we should flag this error */
653 cERROR(1,("reached end of buf searching for pos in buf"
654 " %d index to find %lld rc %d",
655 pos_in_buf,index_to_find,rc));
656 }
657 rc = 0;
658 *ppCurrentEntry = current_entry;
659 } else {
660 cFYI(1,("index not in buffer - could not findnext into it"));
661 return 0;
662 }
663
664 if(pos_in_buf >= cifsFile->srch_inf.entries_in_buffer) {
665 cFYI(1,("can not return entries pos_in_buf beyond last entry"));
666 *num_to_ret = 0;
667 } else
668 *num_to_ret = cifsFile->srch_inf.entries_in_buffer - pos_in_buf;
669
670 return rc;
671 }
672
673 /* inode num, inode type and filename returned */
674 static int cifs_get_name_from_search_buf(struct qstr *pqst,
675 char *current_entry, __u16 level, unsigned int unicode,
676 struct cifs_sb_info * cifs_sb, ino_t *pinum)
677 {
678 int rc = 0;
679 unsigned int len = 0;
680 char * filename;
681 struct nls_table * nlt = cifs_sb->local_nls;
682
683 *pinum = 0;
684
685 if(level == SMB_FIND_FILE_UNIX) {
686 FILE_UNIX_INFO * pFindData = (FILE_UNIX_INFO *)current_entry;
687
688 filename = &pFindData->FileName[0];
689 if(unicode) {
690 len = cifs_unicode_bytelen(filename);
691 } else {
692 /* BB should we make this strnlen of PATH_MAX? */
693 len = strnlen(filename, PATH_MAX);
694 }
695
696 /* BB fixme - hash low and high 32 bits if not 64 bit arch BB fixme */
697 if(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM)
698 *pinum = pFindData->UniqueId;
699 } else if(level == SMB_FIND_FILE_DIRECTORY_INFO) {
700 FILE_DIRECTORY_INFO * pFindData =
701 (FILE_DIRECTORY_INFO *)current_entry;
702 filename = &pFindData->FileName[0];
703 len = le32_to_cpu(pFindData->FileNameLength);
704 } else if(level == SMB_FIND_FILE_FULL_DIRECTORY_INFO) {
705 FILE_FULL_DIRECTORY_INFO * pFindData =
706 (FILE_FULL_DIRECTORY_INFO *)current_entry;
707 filename = &pFindData->FileName[0];
708 len = le32_to_cpu(pFindData->FileNameLength);
709 } else if(level == SMB_FIND_FILE_ID_FULL_DIR_INFO) {
710 SEARCH_ID_FULL_DIR_INFO * pFindData =
711 (SEARCH_ID_FULL_DIR_INFO *)current_entry;
712 filename = &pFindData->FileName[0];
713 len = le32_to_cpu(pFindData->FileNameLength);
714 *pinum = pFindData->UniqueId;
715 } else if(level == SMB_FIND_FILE_BOTH_DIRECTORY_INFO) {
716 FILE_BOTH_DIRECTORY_INFO * pFindData =
717 (FILE_BOTH_DIRECTORY_INFO *)current_entry;
718 filename = &pFindData->FileName[0];
719 len = le32_to_cpu(pFindData->FileNameLength);
720 } else {
721 cFYI(1,("Unknown findfirst level %d",level));
722 return -EINVAL;
723 }
724 if(unicode) {
725 /* BB fixme - test with long names */
726 /* Note converted filename can be longer than in unicode */
727 if(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR)
728 pqst->len = cifs_convertUCSpath((char *)pqst->name,
729 (__le16 *)filename, len/2, nlt);
730 else
731 pqst->len = cifs_strfromUCS_le((char *)pqst->name,
732 (__le16 *)filename,len/2,nlt);
733 } else {
734 pqst->name = filename;
735 pqst->len = len;
736 }
737 pqst->hash = full_name_hash(pqst->name,pqst->len);
738 /* cFYI(1,("filldir on %s",pqst->name)); */
739 return rc;
740 }
741
742 static int cifs_filldir(char *pfindEntry, struct file *file,
743 filldir_t filldir, void *direntry, char *scratch_buf)
744 {
745 int rc = 0;
746 struct qstr qstring;
747 struct cifsFileInfo * pCifsF;
748 unsigned obj_type;
749 ino_t inum;
750 struct cifs_sb_info * cifs_sb;
751 struct inode *tmp_inode;
752 struct dentry *tmp_dentry;
753
754 /* get filename and len into qstring */
755 /* get dentry */
756 /* decide whether to create and populate ionde */
757 if((direntry == NULL) || (file == NULL))
758 return -EINVAL;
759
760 pCifsF = file->private_data;
761
762 if((scratch_buf == NULL) || (pfindEntry == NULL) || (pCifsF == NULL))
763 return -ENOENT;
764
765 if(file->f_dentry == NULL)
766 return -ENOENT;
767
768 cifs_sb = CIFS_SB(file->f_dentry->d_sb);
769
770 qstring.name = scratch_buf;
771 rc = cifs_get_name_from_search_buf(&qstring,pfindEntry,
772 pCifsF->srch_inf.info_level,
773 pCifsF->srch_inf.unicode,cifs_sb,
774 &inum /* returned */);
775
776 if(rc)
777 return rc;
778
779 rc = construct_dentry(&qstring,file,&tmp_inode, &tmp_dentry);
780 if((tmp_inode == NULL) || (tmp_dentry == NULL))
781 return -ENOMEM;
782
783 if(rc) {
784 /* inode created, we need to hash it with right inode number */
785 if(inum != 0) {
786 /* BB fixme - hash the 2 32 quantities bits together if necessary BB */
787 tmp_inode->i_ino = inum;
788 }
789 insert_inode_hash(tmp_inode);
790 }
791
792 /* we pass in rc below, indicating whether it is a new inode,
793 so we can figure out whether to invalidate the inode cached
794 data if the file has changed */
795 if(pCifsF->srch_inf.info_level == SMB_FIND_FILE_UNIX) {
796 unix_fill_in_inode(tmp_inode,
797 (FILE_UNIX_INFO *)pfindEntry,&obj_type, rc);
798 } else {
799 fill_in_inode(tmp_inode,
800 (FILE_DIRECTORY_INFO *)pfindEntry,&obj_type, rc);
801 }
802
803 rc = filldir(direntry,qstring.name,qstring.len,file->f_pos,
804 tmp_inode->i_ino,obj_type);
805 if(rc) {
806 cFYI(1,("filldir rc = %d",rc));
807 }
808
809 dput(tmp_dentry);
810 return rc;
811 }
812
813 static int cifs_save_resume_key(const char *current_entry,
814 struct cifsFileInfo *cifsFile)
815 {
816 int rc = 0;
817 unsigned int len = 0;
818 __u16 level;
819 char * filename;
820
821 if((cifsFile == NULL) || (current_entry == NULL))
822 return -EINVAL;
823
824 level = cifsFile->srch_inf.info_level;
825
826 if(level == SMB_FIND_FILE_UNIX) {
827 FILE_UNIX_INFO * pFindData = (FILE_UNIX_INFO *)current_entry;
828
829 filename = &pFindData->FileName[0];
830 if(cifsFile->srch_inf.unicode) {
831 len = cifs_unicode_bytelen(filename);
832 } else {
833 /* BB should we make this strnlen of PATH_MAX? */
834 len = strnlen(filename, PATH_MAX);
835 }
836 cifsFile->srch_inf.resume_key = pFindData->ResumeKey;
837 } else if(level == SMB_FIND_FILE_DIRECTORY_INFO) {
838 FILE_DIRECTORY_INFO * pFindData =
839 (FILE_DIRECTORY_INFO *)current_entry;
840 filename = &pFindData->FileName[0];
841 len = le32_to_cpu(pFindData->FileNameLength);
842 cifsFile->srch_inf.resume_key = pFindData->FileIndex;
843 } else if(level == SMB_FIND_FILE_FULL_DIRECTORY_INFO) {
844 FILE_FULL_DIRECTORY_INFO * pFindData =
845 (FILE_FULL_DIRECTORY_INFO *)current_entry;
846 filename = &pFindData->FileName[0];
847 len = le32_to_cpu(pFindData->FileNameLength);
848 cifsFile->srch_inf.resume_key = pFindData->FileIndex;
849 } else if(level == SMB_FIND_FILE_ID_FULL_DIR_INFO) {
850 SEARCH_ID_FULL_DIR_INFO * pFindData =
851 (SEARCH_ID_FULL_DIR_INFO *)current_entry;
852 filename = &pFindData->FileName[0];
853 len = le32_to_cpu(pFindData->FileNameLength);
854 cifsFile->srch_inf.resume_key = pFindData->FileIndex;
855 } else if(level == SMB_FIND_FILE_BOTH_DIRECTORY_INFO) {
856 FILE_BOTH_DIRECTORY_INFO * pFindData =
857 (FILE_BOTH_DIRECTORY_INFO *)current_entry;
858 filename = &pFindData->FileName[0];
859 len = le32_to_cpu(pFindData->FileNameLength);
860 cifsFile->srch_inf.resume_key = pFindData->FileIndex;
861 } else {
862 cFYI(1,("Unknown findfirst level %d",level));
863 return -EINVAL;
864 }
865 cifsFile->srch_inf.resume_name_len = len;
866 cifsFile->srch_inf.presume_name = filename;
867 return rc;
868 }
869
870 int cifs_readdir(struct file *file, void *direntry, filldir_t filldir)
871 {
872 int rc = 0;
873 int xid,i;
874 struct cifs_sb_info *cifs_sb;
875 struct cifsTconInfo *pTcon;
876 struct cifsFileInfo *cifsFile = NULL;
877 char * current_entry;
878 int num_to_fill = 0;
879 char * tmp_buf = NULL;
880 char * end_of_smb;
881
882 xid = GetXid();
883
884 if(file->f_dentry == NULL) {
885 FreeXid(xid);
886 return -EIO;
887 }
888
889 cifs_sb = CIFS_SB(file->f_dentry->d_sb);
890 pTcon = cifs_sb->tcon;
891 if(pTcon == NULL)
892 return -EINVAL;
893
894 switch ((int) file->f_pos) {
895 case 0:
896 /*if (filldir(direntry, ".", 1, file->f_pos,
897 file->f_dentry->d_inode->i_ino, DT_DIR) < 0) {
898 cERROR(1, ("Filldir for current dir failed "));
899 rc = -ENOMEM;
900 break;
901 }
902 file->f_pos++; */
903 case 1:
904 /* if (filldir(direntry, "..", 2, file->f_pos,
905 file->f_dentry->d_parent->d_inode->i_ino, DT_DIR) < 0) {
906 cERROR(1, ("Filldir for parent dir failed "));
907 rc = -ENOMEM;
908 break;
909 }
910 file->f_pos++; */
911 case 2:
912 /* 1) If search is active,
913 is in current search buffer?
914 if it before then restart search
915 if after then keep searching till find it */
916
917 if(file->private_data == NULL) {
918 rc = initiate_cifs_search(xid,file);
919 cFYI(1,("initiate cifs search rc %d",rc));
920 if(rc) {
921 FreeXid(xid);
922 return rc;
923 }
924 }
925 default:
926 if(file->private_data == NULL) {
927 rc = -EINVAL;
928 FreeXid(xid);
929 return rc;
930 }
931 cifsFile = file->private_data;
932 if (cifsFile->srch_inf.endOfSearch) {
933 if(cifsFile->srch_inf.emptyDir) {
934 cFYI(1, ("End of search, empty dir"));
935 rc = 0;
936 break;
937 }
938 } /* else {
939 cifsFile->invalidHandle = TRUE;
940 CIFSFindClose(xid, pTcon, cifsFile->netfid);
941 }
942 kfree(cifsFile->search_resume_name);
943 cifsFile->search_resume_name = NULL; */
944
945 /* BB account for . and .. in f_pos as special case */
946
947 rc = find_cifs_entry(xid,pTcon, file,
948 &current_entry,&num_to_fill);
949 if(rc) {
950 cFYI(1,("fce error %d",rc));
951 goto rddir2_exit;
952 } else if (current_entry != NULL) {
953 cFYI(1,("entry %lld found",file->f_pos));
954 } else {
955 cFYI(1,("could not find entry"));
956 goto rddir2_exit;
957 }
958 cFYI(1,("loop through %d times filling dir for net buf %p",
959 num_to_fill,cifsFile->srch_inf.ntwrk_buf_start));
960 end_of_smb = cifsFile->srch_inf.ntwrk_buf_start +
961 smbCalcSize((struct smb_hdr *)
962 cifsFile->srch_inf.ntwrk_buf_start);
963 /* To be safe - for UCS to UTF-8 with strings loaded
964 with the rare long characters alloc more to account for
965 such multibyte target UTF-8 characters. cifs_unicode.c,
966 which actually does the conversion, has the same limit */
967 tmp_buf = kmalloc((2 * NAME_MAX) + 4, GFP_KERNEL);
968 for(i=0;(i<num_to_fill) && (rc == 0);i++) {
969 if(current_entry == NULL) {
970 /* evaluate whether this case is an error */
971 cERROR(1,("past end of SMB num to fill %d i %d",
972 num_to_fill, i));
973 break;
974 }
975
976 rc = cifs_filldir(current_entry, file,
977 filldir, direntry,tmp_buf);
978 file->f_pos++;
979 if(file->f_pos == cifsFile->srch_inf.index_of_last_entry) {
980 cFYI(1,("last entry in buf at pos %lld %s",
981 file->f_pos,tmp_buf)); /* BB removeme BB */
982 cifs_save_resume_key(current_entry,cifsFile);
983 break;
984 } else
985 current_entry = nxt_dir_entry(current_entry,
986 end_of_smb);
987 }
988 kfree(tmp_buf);
989 break;
990 } /* end switch */
991
992 rddir2_exit:
993 FreeXid(xid);
994 return rc;
995 }
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