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add a trivial patch style checker
[linux-2.6/mini2440.git] / fs / cifs / readdir.c
blobc08bda9fcac68bdd29879c18208b1ddb2b7de4f9
1 /*
2 * fs/cifs/readdir.c
3 *
4 * Directory search handling
5 *
6 * Copyright (C) International Business Machines Corp., 2004, 2007
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 "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 #ifdef CONFIG_CIFS_DEBUG2
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 #endif /* DEBUG2 */
58
59 /* Returns one if new inode created (which therefore needs to be hashed) */
60 /* Might check in the future if inode number changed so we can rehash inode */
61 static int construct_dentry(struct qstr *qstring, struct file *file,
62 struct inode **ptmp_inode, struct dentry **pnew_dentry)
63 {
64 struct dentry *tmp_dentry;
65 struct cifs_sb_info *cifs_sb;
66 struct cifsTconInfo *pTcon;
67 int rc = 0;
68
69 cFYI(1, ("For %s", qstring->name));
70 cifs_sb = CIFS_SB(file->f_path.dentry->d_sb);
71 pTcon = cifs_sb->tcon;
72
73 qstring->hash = full_name_hash(qstring->name, qstring->len);
74 tmp_dentry = d_lookup(file->f_path.dentry, qstring);
75 if (tmp_dentry) {
76 cFYI(0, ("existing dentry with inode 0x%p", tmp_dentry->d_inode));
77 *ptmp_inode = tmp_dentry->d_inode;
78 /* BB overwrite old name? i.e. tmp_dentry->d_name and tmp_dentry->d_name.len??*/
79 if (*ptmp_inode == NULL) {
80 *ptmp_inode = new_inode(file->f_path.dentry->d_sb);
81 if (*ptmp_inode == NULL)
82 return rc;
83 rc = 1;
84 }
85 if (file->f_path.dentry->d_sb->s_flags & MS_NOATIME)
86 (*ptmp_inode)->i_flags |= S_NOATIME | S_NOCMTIME;
87 } else {
88 tmp_dentry = d_alloc(file->f_path.dentry, qstring);
89 if (tmp_dentry == NULL) {
90 cERROR(1,("Failed allocating dentry"));
91 *ptmp_inode = NULL;
92 return rc;
93 }
94
95 *ptmp_inode = new_inode(file->f_path.dentry->d_sb);
96 if (pTcon->nocase)
97 tmp_dentry->d_op = &cifs_ci_dentry_ops;
98 else
99 tmp_dentry->d_op = &cifs_dentry_ops;
100 if (*ptmp_inode == NULL)
101 return rc;
102 if (file->f_path.dentry->d_sb->s_flags & MS_NOATIME)
103 (*ptmp_inode)->i_flags |= S_NOATIME | S_NOCMTIME;
104 rc = 2;
105 }
106
107 tmp_dentry->d_time = jiffies;
108 *pnew_dentry = tmp_dentry;
109 return rc;
110 }
111
112 static void AdjustForTZ(struct cifsTconInfo * tcon, struct inode * inode)
113 {
114 if ((tcon) && (tcon->ses) && (tcon->ses->server)) {
115 inode->i_ctime.tv_sec += tcon->ses->server->timeAdj;
116 inode->i_mtime.tv_sec += tcon->ses->server->timeAdj;
117 inode->i_atime.tv_sec += tcon->ses->server->timeAdj;
118 }
119 return;
120 }
121
122
123 static void fill_in_inode(struct inode *tmp_inode, int new_buf_type,
124 char * buf, int *pobject_type, int isNewInode)
125 {
126 loff_t local_size;
127 struct timespec local_mtime;
128
129 struct cifsInodeInfo *cifsInfo = CIFS_I(tmp_inode);
130 struct cifs_sb_info *cifs_sb = CIFS_SB(tmp_inode->i_sb);
131 __u32 attr;
132 __u64 allocation_size;
133 __u64 end_of_file;
134
135 /* save mtime and size */
136 local_mtime = tmp_inode->i_mtime;
137 local_size = tmp_inode->i_size;
138
139 if (new_buf_type) {
140 FILE_DIRECTORY_INFO *pfindData = (FILE_DIRECTORY_INFO *)buf;
141
142 attr = le32_to_cpu(pfindData->ExtFileAttributes);
143 allocation_size = le64_to_cpu(pfindData->AllocationSize);
144 end_of_file = le64_to_cpu(pfindData->EndOfFile);
145 tmp_inode->i_atime =
146 cifs_NTtimeToUnix(le64_to_cpu(pfindData->LastAccessTime));
147 tmp_inode->i_mtime =
148 cifs_NTtimeToUnix(le64_to_cpu(pfindData->LastWriteTime));
149 tmp_inode->i_ctime =
150 cifs_NTtimeToUnix(le64_to_cpu(pfindData->ChangeTime));
151 } else { /* legacy, OS2 and DOS style */
152 /* struct timespec ts;*/
153 FIND_FILE_STANDARD_INFO * pfindData =
154 (FIND_FILE_STANDARD_INFO *)buf;
155
156 tmp_inode->i_mtime = cnvrtDosUnixTm(
157 le16_to_cpu(pfindData->LastWriteDate),
158 le16_to_cpu(pfindData->LastWriteTime));
159 tmp_inode->i_atime = cnvrtDosUnixTm(
160 le16_to_cpu(pfindData->LastAccessDate),
161 le16_to_cpu(pfindData->LastAccessTime));
162 tmp_inode->i_ctime = cnvrtDosUnixTm(
163 le16_to_cpu(pfindData->LastWriteDate),
164 le16_to_cpu(pfindData->LastWriteTime));
165 AdjustForTZ(cifs_sb->tcon, tmp_inode);
166 attr = le16_to_cpu(pfindData->Attributes);
167 allocation_size = le32_to_cpu(pfindData->AllocationSize);
168 end_of_file = le32_to_cpu(pfindData->DataSize);
169 }
170
171 /* Linux can not store file creation time unfortunately so ignore it */
172
173 cifsInfo->cifsAttrs = attr;
174 cifsInfo->time = jiffies;
175
176 /* treat dos attribute of read-only as read-only mode bit e.g. 555? */
177 /* 2767 perms - indicate mandatory locking */
178 /* BB fill in uid and gid here? with help from winbind?
179 or retrieve from NTFS stream extended attribute */
180 if (atomic_read(&cifsInfo->inUse) == 0) {
181 tmp_inode->i_uid = cifs_sb->mnt_uid;
182 tmp_inode->i_gid = cifs_sb->mnt_gid;
183 /* set default mode. will override for dirs below */
184 tmp_inode->i_mode = cifs_sb->mnt_file_mode;
185 } else {
186 /* mask off the type bits since it gets set
187 below and we do not want to get two type
188 bits set */
189 tmp_inode->i_mode &= ~S_IFMT;
190 }
191
192 if (attr & ATTR_DIRECTORY) {
193 *pobject_type = DT_DIR;
194 /* override default perms since we do not lock dirs */
195 if (atomic_read(&cifsInfo->inUse) == 0) {
196 tmp_inode->i_mode = cifs_sb->mnt_dir_mode;
197 }
198 tmp_inode->i_mode |= S_IFDIR;
199 } else if ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_UNX_EMUL) &&
200 (attr & ATTR_SYSTEM)) {
201 if (end_of_file == 0) {
202 *pobject_type = DT_FIFO;
203 tmp_inode->i_mode |= S_IFIFO;
204 } else {
205 /* rather than get the type here, we mark the
206 inode as needing revalidate and get the real type
207 (blk vs chr vs. symlink) later ie in lookup */
208 *pobject_type = DT_REG;
209 tmp_inode->i_mode |= S_IFREG;
210 cifsInfo->time = 0;
211 }
212 /* we no longer mark these because we could not follow them */
213 /* } else if (attr & ATTR_REPARSE) {
214 *pobject_type = DT_LNK;
215 tmp_inode->i_mode |= S_IFLNK; */
216 } else {
217 *pobject_type = DT_REG;
218 tmp_inode->i_mode |= S_IFREG;
219 if (attr & ATTR_READONLY)
220 tmp_inode->i_mode &= ~(S_IWUGO);
221 else if ((tmp_inode->i_mode & S_IWUGO) == 0)
222 /* the ATTR_READONLY flag may have been changed on */
223 /* server -- set any w bits allowed by mnt_file_mode */
224 tmp_inode->i_mode |= (S_IWUGO & cifs_sb->mnt_file_mode);
225 } /* could add code here - to validate if device or weird share type? */
226
227 /* can not fill in nlink here as in qpathinfo version and Unx search */
228 if (atomic_read(&cifsInfo->inUse) == 0) {
229 atomic_set(&cifsInfo->inUse, 1);
230 }
231
232 spin_lock(&tmp_inode->i_lock);
233 if (is_size_safe_to_change(cifsInfo, end_of_file)) {
234 /* can not safely change the file size here if the
235 client is writing to it due to potential races */
236 i_size_write(tmp_inode, end_of_file);
237
238 /* 512 bytes (2**9) is the fake blocksize that must be used */
239 /* for this calculation, even though the reported blocksize is larger */
240 tmp_inode->i_blocks = (512 - 1 + allocation_size) >> 9;
241 }
242 spin_unlock(&tmp_inode->i_lock);
243
244 if (allocation_size < end_of_file)
245 cFYI(1, ("May be sparse file, allocation less than file size"));
246 cFYI(1, ("File Size %ld and blocks %llu",
247 (unsigned long)tmp_inode->i_size,
248 (unsigned long long)tmp_inode->i_blocks));
249 if (S_ISREG(tmp_inode->i_mode)) {
250 cFYI(1, ("File inode"));
251 tmp_inode->i_op = &cifs_file_inode_ops;
252 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DIRECT_IO) {
253 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_BRL)
254 tmp_inode->i_fop = &cifs_file_direct_nobrl_ops;
255 else
256 tmp_inode->i_fop = &cifs_file_direct_ops;
257
258 } else if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_BRL)
259 tmp_inode->i_fop = &cifs_file_nobrl_ops;
260 else
261 tmp_inode->i_fop = &cifs_file_ops;
262
263 if ((cifs_sb->tcon) && (cifs_sb->tcon->ses) &&
264 (cifs_sb->tcon->ses->server->maxBuf <
265 PAGE_CACHE_SIZE + MAX_CIFS_HDR_SIZE))
266 tmp_inode->i_data.a_ops = &cifs_addr_ops_smallbuf;
267 else
268 tmp_inode->i_data.a_ops = &cifs_addr_ops;
269
270 if (isNewInode)
271 return; /* No sense invalidating pages for new inode
272 since have not started caching readahead file
273 data yet */
274
275 if (timespec_equal(&tmp_inode->i_mtime, &local_mtime) &&
276 (local_size == tmp_inode->i_size)) {
277 cFYI(1, ("inode exists but unchanged"));
278 } else {
279 /* file may have changed on server */
280 cFYI(1, ("invalidate inode, readdir detected change"));
281 invalidate_remote_inode(tmp_inode);
282 }
283 } else if (S_ISDIR(tmp_inode->i_mode)) {
284 cFYI(1, ("Directory inode"));
285 tmp_inode->i_op = &cifs_dir_inode_ops;
286 tmp_inode->i_fop = &cifs_dir_ops;
287 } else if (S_ISLNK(tmp_inode->i_mode)) {
288 cFYI(1, ("Symbolic Link inode"));
289 tmp_inode->i_op = &cifs_symlink_inode_ops;
290 } else {
291 cFYI(1, ("Init special inode"));
292 init_special_inode(tmp_inode, tmp_inode->i_mode,
293 tmp_inode->i_rdev);
294 }
295 }
296
297 static void unix_fill_in_inode(struct inode *tmp_inode,
298 FILE_UNIX_INFO *pfindData, int *pobject_type, int isNewInode)
299 {
300 loff_t local_size;
301 struct timespec local_mtime;
302
303 struct cifsInodeInfo *cifsInfo = CIFS_I(tmp_inode);
304 struct cifs_sb_info *cifs_sb = CIFS_SB(tmp_inode->i_sb);
305
306 __u32 type = le32_to_cpu(pfindData->Type);
307 __u64 num_of_bytes = le64_to_cpu(pfindData->NumOfBytes);
308 __u64 end_of_file = le64_to_cpu(pfindData->EndOfFile);
309 cifsInfo->time = jiffies;
310 atomic_inc(&cifsInfo->inUse);
311
312 /* save mtime and size */
313 local_mtime = tmp_inode->i_mtime;
314 local_size = tmp_inode->i_size;
315
316 tmp_inode->i_atime =
317 cifs_NTtimeToUnix(le64_to_cpu(pfindData->LastAccessTime));
318 tmp_inode->i_mtime =
319 cifs_NTtimeToUnix(le64_to_cpu(pfindData->LastModificationTime));
320 tmp_inode->i_ctime =
321 cifs_NTtimeToUnix(le64_to_cpu(pfindData->LastStatusChange));
322
323 tmp_inode->i_mode = le64_to_cpu(pfindData->Permissions);
324 /* since we set the inode type below we need to mask off type
325 to avoid strange results if bits above were corrupt */
326 tmp_inode->i_mode &= ~S_IFMT;
327 if (type == UNIX_FILE) {
328 *pobject_type = DT_REG;
329 tmp_inode->i_mode |= S_IFREG;
330 } else if (type == UNIX_SYMLINK) {
331 *pobject_type = DT_LNK;
332 tmp_inode->i_mode |= S_IFLNK;
333 } else if (type == UNIX_DIR) {
334 *pobject_type = DT_DIR;
335 tmp_inode->i_mode |= S_IFDIR;
336 } else if (type == UNIX_CHARDEV) {
337 *pobject_type = DT_CHR;
338 tmp_inode->i_mode |= S_IFCHR;
339 tmp_inode->i_rdev = MKDEV(le64_to_cpu(pfindData->DevMajor),
340 le64_to_cpu(pfindData->DevMinor) & MINORMASK);
341 } else if (type == UNIX_BLOCKDEV) {
342 *pobject_type = DT_BLK;
343 tmp_inode->i_mode |= S_IFBLK;
344 tmp_inode->i_rdev = MKDEV(le64_to_cpu(pfindData->DevMajor),
345 le64_to_cpu(pfindData->DevMinor) & MINORMASK);
346 } else if (type == UNIX_FIFO) {
347 *pobject_type = DT_FIFO;
348 tmp_inode->i_mode |= S_IFIFO;
349 } else if (type == UNIX_SOCKET) {
350 *pobject_type = DT_SOCK;
351 tmp_inode->i_mode |= S_IFSOCK;
352 } else {
353 /* safest to just call it a file */
354 *pobject_type = DT_REG;
355 tmp_inode->i_mode |= S_IFREG;
356 cFYI(1,("unknown inode type %d",type));
357 }
358
359 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_OVERR_UID)
360 tmp_inode->i_uid = cifs_sb->mnt_uid;
361 else
362 tmp_inode->i_uid = le64_to_cpu(pfindData->Uid);
363 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_OVERR_GID)
364 tmp_inode->i_gid = cifs_sb->mnt_gid;
365 else
366 tmp_inode->i_gid = le64_to_cpu(pfindData->Gid);
367 tmp_inode->i_nlink = le64_to_cpu(pfindData->Nlinks);
368
369 spin_lock(&tmp_inode->i_lock);
370 if (is_size_safe_to_change(cifsInfo, end_of_file)) {
371 /* can not safely change the file size here if the
372 client is writing to it due to potential races */
373 i_size_write(tmp_inode, end_of_file);
374
375 /* 512 bytes (2**9) is the fake blocksize that must be used */
376 /* for this calculation, not the real blocksize */
377 tmp_inode->i_blocks = (512 - 1 + num_of_bytes) >> 9;
378 }
379 spin_unlock(&tmp_inode->i_lock);
380
381 if (S_ISREG(tmp_inode->i_mode)) {
382 cFYI(1, ("File inode"));
383 tmp_inode->i_op = &cifs_file_inode_ops;
384
385 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DIRECT_IO) {
386 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_BRL)
387 tmp_inode->i_fop = &cifs_file_direct_nobrl_ops;
388 else
389 tmp_inode->i_fop = &cifs_file_direct_ops;
390 } else if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_BRL)
391 tmp_inode->i_fop = &cifs_file_nobrl_ops;
392 else
393 tmp_inode->i_fop = &cifs_file_ops;
394
395 if ((cifs_sb->tcon) && (cifs_sb->tcon->ses) &&
396 (cifs_sb->tcon->ses->server->maxBuf <
397 PAGE_CACHE_SIZE + MAX_CIFS_HDR_SIZE))
398 tmp_inode->i_data.a_ops = &cifs_addr_ops_smallbuf;
399 else
400 tmp_inode->i_data.a_ops = &cifs_addr_ops;
401
402 if (isNewInode)
403 return; /* No sense invalidating pages for new inode since we
404 have not started caching readahead file data yet */
405
406 if (timespec_equal(&tmp_inode->i_mtime, &local_mtime) &&
407 (local_size == tmp_inode->i_size)) {
408 cFYI(1, ("inode exists but unchanged"));
409 } else {
410 /* file may have changed on server */
411 cFYI(1, ("invalidate inode, readdir detected change"));
412 invalidate_remote_inode(tmp_inode);
413 }
414 } else if (S_ISDIR(tmp_inode->i_mode)) {
415 cFYI(1, ("Directory inode"));
416 tmp_inode->i_op = &cifs_dir_inode_ops;
417 tmp_inode->i_fop = &cifs_dir_ops;
418 } else if (S_ISLNK(tmp_inode->i_mode)) {
419 cFYI(1, ("Symbolic Link inode"));
420 tmp_inode->i_op = &cifs_symlink_inode_ops;
421 /* tmp_inode->i_fop = *//* do not need to set to anything */
422 } else {
423 cFYI(1, ("Special inode"));
424 init_special_inode(tmp_inode, tmp_inode->i_mode,
425 tmp_inode->i_rdev);
426 }
427 }
428
429 static int initiate_cifs_search(const int xid, struct file *file)
430 {
431 int rc = 0;
432 char * full_path;
433 struct cifsFileInfo * cifsFile;
434 struct cifs_sb_info *cifs_sb;
435 struct cifsTconInfo *pTcon;
436
437 if (file->private_data == NULL) {
438 file->private_data =
439 kzalloc(sizeof(struct cifsFileInfo),GFP_KERNEL);
440 }
441
442 if (file->private_data == NULL)
443 return -ENOMEM;
444 cifsFile = file->private_data;
445 cifsFile->invalidHandle = TRUE;
446 cifsFile->srch_inf.endOfSearch = FALSE;
447
448 cifs_sb = CIFS_SB(file->f_path.dentry->d_sb);
449 if (cifs_sb == NULL)
450 return -EINVAL;
451
452 pTcon = cifs_sb->tcon;
453 if (pTcon == NULL)
454 return -EINVAL;
455
456 full_path = build_path_from_dentry(file->f_path.dentry);
457
458 if (full_path == NULL) {
459 return -ENOMEM;
460 }
461
462 cFYI(1, ("Full path: %s start at: %lld", full_path, file->f_pos));
463
464 ffirst_retry:
465 /* test for Unix extensions */
466 if (pTcon->ses->capabilities & CAP_UNIX) {
467 cifsFile->srch_inf.info_level = SMB_FIND_FILE_UNIX;
468 } else if ((pTcon->ses->capabilities &
469 (CAP_NT_SMBS | CAP_NT_FIND)) == 0) {
470 cifsFile->srch_inf.info_level = SMB_FIND_FILE_INFO_STANDARD;
471 } else if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM) {
472 cifsFile->srch_inf.info_level = SMB_FIND_FILE_ID_FULL_DIR_INFO;
473 } else /* not srvinos - BB fixme add check for backlevel? */ {
474 cifsFile->srch_inf.info_level = SMB_FIND_FILE_DIRECTORY_INFO;
475 }
476
477 rc = CIFSFindFirst(xid, pTcon,full_path,cifs_sb->local_nls,
478 &cifsFile->netfid, &cifsFile->srch_inf,
479 cifs_sb->mnt_cifs_flags &
480 CIFS_MOUNT_MAP_SPECIAL_CHR, CIFS_DIR_SEP(cifs_sb));
481 if (rc == 0)
482 cifsFile->invalidHandle = FALSE;
483 if ((rc == -EOPNOTSUPP) &&
484 (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM)) {
485 cifs_sb->mnt_cifs_flags &= ~CIFS_MOUNT_SERVER_INUM;
486 goto ffirst_retry;
487 }
488 kfree(full_path);
489 return rc;
490 }
491
492 /* return length of unicode string in bytes */
493 static int cifs_unicode_bytelen(char *str)
494 {
495 int len;
496 __le16 * ustr = (__le16 *)str;
497
498 for(len=0;len <= PATH_MAX;len++) {
499 if (ustr[len] == 0)
500 return len << 1;
501 }
502 cFYI(1,("Unicode string longer than PATH_MAX found"));
503 return len << 1;
504 }
505
506 static char *nxt_dir_entry(char *old_entry, char *end_of_smb, int level)
507 {
508 char * new_entry;
509 FILE_DIRECTORY_INFO * pDirInfo = (FILE_DIRECTORY_INFO *)old_entry;
510
511 if (level == SMB_FIND_FILE_INFO_STANDARD) {
512 FIND_FILE_STANDARD_INFO * pfData;
513 pfData = (FIND_FILE_STANDARD_INFO *)pDirInfo;
514
515 new_entry = old_entry + sizeof(FIND_FILE_STANDARD_INFO) +
516 pfData->FileNameLength;
517 } else
518 new_entry = old_entry + le32_to_cpu(pDirInfo->NextEntryOffset);
519 cFYI(1,("new entry %p old entry %p",new_entry,old_entry));
520 /* validate that new_entry is not past end of SMB */
521 if (new_entry >= end_of_smb) {
522 cERROR(1,
523 ("search entry %p began after end of SMB %p old entry %p",
524 new_entry, end_of_smb, old_entry));
525 return NULL;
526 } else if (((level == SMB_FIND_FILE_INFO_STANDARD) &&
527 (new_entry + sizeof(FIND_FILE_STANDARD_INFO) > end_of_smb)) ||
528 ((level != SMB_FIND_FILE_INFO_STANDARD) &&
529 (new_entry + sizeof(FILE_DIRECTORY_INFO) > end_of_smb))) {
530 cERROR(1,("search entry %p extends after end of SMB %p",
531 new_entry, end_of_smb));
532 return NULL;
533 } else
534 return new_entry;
535
536 }
537
538 #define UNICODE_DOT cpu_to_le16(0x2e)
539
540 /* return 0 if no match and 1 for . (current directory) and 2 for .. (parent) */
541 static int cifs_entry_is_dot(char *current_entry, struct cifsFileInfo *cfile)
542 {
543 int rc = 0;
544 char * filename = NULL;
545 int len = 0;
546
547 if (cfile->srch_inf.info_level == SMB_FIND_FILE_UNIX) {
548 FILE_UNIX_INFO * pFindData = (FILE_UNIX_INFO *)current_entry;
549 filename = &pFindData->FileName[0];
550 if (cfile->srch_inf.unicode) {
551 len = cifs_unicode_bytelen(filename);
552 } else {
553 /* BB should we make this strnlen of PATH_MAX? */
554 len = strnlen(filename, 5);
555 }
556 } else if (cfile->srch_inf.info_level == SMB_FIND_FILE_DIRECTORY_INFO) {
557 FILE_DIRECTORY_INFO * pFindData =
558 (FILE_DIRECTORY_INFO *)current_entry;
559 filename = &pFindData->FileName[0];
560 len = le32_to_cpu(pFindData->FileNameLength);
561 } else if (cfile->srch_inf.info_level ==
562 SMB_FIND_FILE_FULL_DIRECTORY_INFO) {
563 FILE_FULL_DIRECTORY_INFO * pFindData =
564 (FILE_FULL_DIRECTORY_INFO *)current_entry;
565 filename = &pFindData->FileName[0];
566 len = le32_to_cpu(pFindData->FileNameLength);
567 } else if (cfile->srch_inf.info_level ==
568 SMB_FIND_FILE_ID_FULL_DIR_INFO) {
569 SEARCH_ID_FULL_DIR_INFO * pFindData =
570 (SEARCH_ID_FULL_DIR_INFO *)current_entry;
571 filename = &pFindData->FileName[0];
572 len = le32_to_cpu(pFindData->FileNameLength);
573 } else if (cfile->srch_inf.info_level ==
574 SMB_FIND_FILE_BOTH_DIRECTORY_INFO) {
575 FILE_BOTH_DIRECTORY_INFO * pFindData =
576 (FILE_BOTH_DIRECTORY_INFO *)current_entry;
577 filename = &pFindData->FileName[0];
578 len = le32_to_cpu(pFindData->FileNameLength);
579 } else if (cfile->srch_inf.info_level == SMB_FIND_FILE_INFO_STANDARD) {
580 FIND_FILE_STANDARD_INFO * pFindData =
581 (FIND_FILE_STANDARD_INFO *)current_entry;
582 filename = &pFindData->FileName[0];
583 len = pFindData->FileNameLength;
584 } else {
585 cFYI(1,("Unknown findfirst level %d",cfile->srch_inf.info_level));
586 }
587
588 if (filename) {
589 if (cfile->srch_inf.unicode) {
590 __le16 *ufilename = (__le16 *)filename;
591 if (len == 2) {
592 /* check for . */
593 if (ufilename[0] == UNICODE_DOT)
594 rc = 1;
595 } else if (len == 4) {
596 /* check for .. */
597 if ((ufilename[0] == UNICODE_DOT)
598 &&(ufilename[1] == UNICODE_DOT))
599 rc = 2;
600 }
601 } else /* ASCII */ {
602 if (len == 1) {
603 if (filename[0] == '.')
604 rc = 1;
605 } else if (len == 2) {
606 if((filename[0] == '.') && (filename[1] == '.'))
607 rc = 2;
608 }
609 }
610 }
611
612 return rc;
613 }
614
615 /* Check if directory that we are searching has changed so we can decide
616 whether we can use the cached search results from the previous search */
617 static int is_dir_changed(struct file * file)
618 {
619 struct inode *inode = file->f_path.dentry->d_inode;
620 struct cifsInodeInfo *cifsInfo = CIFS_I(inode);
621
622 if (cifsInfo->time == 0)
623 return 1; /* directory was changed, perhaps due to unlink */
624 else
625 return 0;
626
627 }
628
629 /* find the corresponding entry in the search */
630 /* Note that the SMB server returns search entries for . and .. which
631 complicates logic here if we choose to parse for them and we do not
632 assume that they are located in the findfirst return buffer.*/
633 /* We start counting in the buffer with entry 2 and increment for every
634 entry (do not increment for . or .. entry) */
635 static int find_cifs_entry(const int xid, struct cifsTconInfo *pTcon,
636 struct file *file, char **ppCurrentEntry, int *num_to_ret)
637 {
638 int rc = 0;
639 int pos_in_buf = 0;
640 loff_t first_entry_in_buffer;
641 loff_t index_to_find = file->f_pos;
642 struct cifsFileInfo * cifsFile = file->private_data;
643 /* check if index in the buffer */
644
645 if ((cifsFile == NULL) || (ppCurrentEntry == NULL) ||
646 (num_to_ret == NULL))
647 return -ENOENT;
648
649 *ppCurrentEntry = NULL;
650 first_entry_in_buffer =
651 cifsFile->srch_inf.index_of_last_entry -
652 cifsFile->srch_inf.entries_in_buffer;
653
654 /* if first entry in buf is zero then is first buffer
655 in search response data which means it is likely . and ..
656 will be in this buffer, although some servers do not return
657 . and .. for the root of a drive and for those we need
658 to start two entries earlier */
659
660 #ifdef CONFIG_CIFS_DEBUG2
661 dump_cifs_file_struct(file, "In fce ");
662 #endif
663 if (((index_to_find < cifsFile->srch_inf.index_of_last_entry) &&
664 is_dir_changed(file)) ||
665 (index_to_find < first_entry_in_buffer)) {
666 /* close and restart search */
667 cFYI(1,("search backing up - close and restart search"));
668 cifsFile->invalidHandle = TRUE;
669 CIFSFindClose(xid, pTcon, cifsFile->netfid);
670 kfree(cifsFile->search_resume_name);
671 cifsFile->search_resume_name = NULL;
672 if (cifsFile->srch_inf.ntwrk_buf_start) {
673 cFYI(1,("freeing SMB ff cache buf on search rewind"));
674 if (cifsFile->srch_inf.smallBuf)
675 cifs_small_buf_release(cifsFile->srch_inf.
676 ntwrk_buf_start);
677 else
678 cifs_buf_release(cifsFile->srch_inf.
679 ntwrk_buf_start);
680 }
681 rc = initiate_cifs_search(xid,file);
682 if (rc) {
683 cFYI(1,("error %d reinitiating a search on rewind",rc));
684 return rc;
685 }
686 }
687
688 while((index_to_find >= cifsFile->srch_inf.index_of_last_entry) &&
689 (rc == 0) && (cifsFile->srch_inf.endOfSearch == FALSE)){
690 cFYI(1,("calling findnext2"));
691 rc = CIFSFindNext(xid,pTcon,cifsFile->netfid,
692 &cifsFile->srch_inf);
693 if (rc)
694 return -ENOENT;
695 }
696 if (index_to_find < cifsFile->srch_inf.index_of_last_entry) {
697 /* we found the buffer that contains the entry */
698 /* scan and find it */
699 int i;
700 char * current_entry;
701 char * end_of_smb = cifsFile->srch_inf.ntwrk_buf_start +
702 smbCalcSize((struct smb_hdr *)
703 cifsFile->srch_inf.ntwrk_buf_start);
704
705 current_entry = cifsFile->srch_inf.srch_entries_start;
706 first_entry_in_buffer = cifsFile->srch_inf.index_of_last_entry
707 - cifsFile->srch_inf.entries_in_buffer;
708 pos_in_buf = index_to_find - first_entry_in_buffer;
709 cFYI(1,("found entry - pos_in_buf %d",pos_in_buf));
710
711 for(i=0;(i<(pos_in_buf)) && (current_entry != NULL);i++) {
712 /* go entry by entry figuring out which is first */
713 current_entry = nxt_dir_entry(current_entry,end_of_smb,
714 cifsFile->srch_inf.info_level);
715 }
716 if((current_entry == NULL) && (i < pos_in_buf)) {
717 /* BB fixme - check if we should flag this error */
718 cERROR(1,("reached end of buf searching for pos in buf"
719 " %d index to find %lld rc %d",
720 pos_in_buf,index_to_find,rc));
721 }
722 rc = 0;
723 *ppCurrentEntry = current_entry;
724 } else {
725 cFYI(1,("index not in buffer - could not findnext into it"));
726 return 0;
727 }
728
729 if(pos_in_buf >= cifsFile->srch_inf.entries_in_buffer) {
730 cFYI(1,("can not return entries pos_in_buf beyond last entry"));
731 *num_to_ret = 0;
732 } else
733 *num_to_ret = cifsFile->srch_inf.entries_in_buffer - pos_in_buf;
734
735 return rc;
736 }
737
738 /* inode num, inode type and filename returned */
739 static int cifs_get_name_from_search_buf(struct qstr *pqst,
740 char *current_entry, __u16 level, unsigned int unicode,
741 struct cifs_sb_info * cifs_sb, int max_len, ino_t *pinum)
742 {
743 int rc = 0;
744 unsigned int len = 0;
745 char * filename;
746 struct nls_table * nlt = cifs_sb->local_nls;
747
748 *pinum = 0;
749
750 if(level == SMB_FIND_FILE_UNIX) {
751 FILE_UNIX_INFO * pFindData = (FILE_UNIX_INFO *)current_entry;
752
753 filename = &pFindData->FileName[0];
754 if(unicode) {
755 len = cifs_unicode_bytelen(filename);
756 } else {
757 /* BB should we make this strnlen of PATH_MAX? */
758 len = strnlen(filename, PATH_MAX);
759 }
760
761 /* BB fixme - hash low and high 32 bits if not 64 bit arch BB fixme */
762 if(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM)
763 *pinum = pFindData->UniqueId;
764 } else if(level == SMB_FIND_FILE_DIRECTORY_INFO) {
765 FILE_DIRECTORY_INFO * pFindData =
766 (FILE_DIRECTORY_INFO *)current_entry;
767 filename = &pFindData->FileName[0];
768 len = le32_to_cpu(pFindData->FileNameLength);
769 } else if(level == SMB_FIND_FILE_FULL_DIRECTORY_INFO) {
770 FILE_FULL_DIRECTORY_INFO * pFindData =
771 (FILE_FULL_DIRECTORY_INFO *)current_entry;
772 filename = &pFindData->FileName[0];
773 len = le32_to_cpu(pFindData->FileNameLength);
774 } else if(level == SMB_FIND_FILE_ID_FULL_DIR_INFO) {
775 SEARCH_ID_FULL_DIR_INFO * pFindData =
776 (SEARCH_ID_FULL_DIR_INFO *)current_entry;
777 filename = &pFindData->FileName[0];
778 len = le32_to_cpu(pFindData->FileNameLength);
779 *pinum = pFindData->UniqueId;
780 } else if(level == SMB_FIND_FILE_BOTH_DIRECTORY_INFO) {
781 FILE_BOTH_DIRECTORY_INFO * pFindData =
782 (FILE_BOTH_DIRECTORY_INFO *)current_entry;
783 filename = &pFindData->FileName[0];
784 len = le32_to_cpu(pFindData->FileNameLength);
785 } else if(level == SMB_FIND_FILE_INFO_STANDARD) {
786 FIND_FILE_STANDARD_INFO * pFindData =
787 (FIND_FILE_STANDARD_INFO *)current_entry;
788 filename = &pFindData->FileName[0];
789 /* one byte length, no name conversion */
790 len = (unsigned int)pFindData->FileNameLength;
791 } else {
792 cFYI(1,("Unknown findfirst level %d",level));
793 return -EINVAL;
794 }
795
796 if(len > max_len) {
797 cERROR(1,("bad search response length %d past smb end", len));
798 return -EINVAL;
799 }
800
801 if(unicode) {
802 /* BB fixme - test with long names */
803 /* Note converted filename can be longer than in unicode */
804 if(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR)
805 pqst->len = cifs_convertUCSpath((char *)pqst->name,
806 (__le16 *)filename, len/2, nlt);
807 else
808 pqst->len = cifs_strfromUCS_le((char *)pqst->name,
809 (__le16 *)filename,len/2,nlt);
810 } else {
811 pqst->name = filename;
812 pqst->len = len;
813 }
814 pqst->hash = full_name_hash(pqst->name,pqst->len);
815 /* cFYI(1,("filldir on %s",pqst->name)); */
816 return rc;
817 }
818
819 static int cifs_filldir(char *pfindEntry, struct file *file,
820 filldir_t filldir, void *direntry, char *scratch_buf, int max_len)
821 {
822 int rc = 0;
823 struct qstr qstring;
824 struct cifsFileInfo * pCifsF;
825 unsigned obj_type;
826 ino_t inum;
827 struct cifs_sb_info * cifs_sb;
828 struct inode *tmp_inode;
829 struct dentry *tmp_dentry;
830
831 /* get filename and len into qstring */
832 /* get dentry */
833 /* decide whether to create and populate ionde */
834 if((direntry == NULL) || (file == NULL))
835 return -EINVAL;
836
837 pCifsF = file->private_data;
838
839 if((scratch_buf == NULL) || (pfindEntry == NULL) || (pCifsF == NULL))
840 return -ENOENT;
841
842 rc = cifs_entry_is_dot(pfindEntry,pCifsF);
843 /* skip . and .. since we added them first */
844 if(rc != 0)
845 return 0;
846
847 cifs_sb = CIFS_SB(file->f_path.dentry->d_sb);
848
849 qstring.name = scratch_buf;
850 rc = cifs_get_name_from_search_buf(&qstring,pfindEntry,
851 pCifsF->srch_inf.info_level,
852 pCifsF->srch_inf.unicode,cifs_sb,
853 max_len,
854 &inum /* returned */);
855
856 if(rc)
857 return rc;
858
859 rc = construct_dentry(&qstring,file,&tmp_inode, &tmp_dentry);
860 if((tmp_inode == NULL) || (tmp_dentry == NULL))
861 return -ENOMEM;
862
863 if(rc) {
864 /* inode created, we need to hash it with right inode number */
865 if(inum != 0) {
866 /* BB fixme - hash the 2 32 quantities bits together if necessary BB */
867 tmp_inode->i_ino = inum;
868 }
869 insert_inode_hash(tmp_inode);
870 }
871
872 /* we pass in rc below, indicating whether it is a new inode,
873 so we can figure out whether to invalidate the inode cached
874 data if the file has changed */
875 if(pCifsF->srch_inf.info_level == SMB_FIND_FILE_UNIX)
876 unix_fill_in_inode(tmp_inode,
877 (FILE_UNIX_INFO *)pfindEntry,
878 &obj_type, rc);
879 else if(pCifsF->srch_inf.info_level == SMB_FIND_FILE_INFO_STANDARD)
880 fill_in_inode(tmp_inode, 0 /* old level 1 buffer type */,
881 pfindEntry, &obj_type, rc);
882 else
883 fill_in_inode(tmp_inode, 1 /* NT */, pfindEntry, &obj_type, rc);
884
885 if(rc) /* new inode - needs to be tied to dentry */ {
886 d_instantiate(tmp_dentry, tmp_inode);
887 if(rc == 2)
888 d_rehash(tmp_dentry);
889 }
890
891
892 rc = filldir(direntry,qstring.name,qstring.len,file->f_pos,
893 tmp_inode->i_ino,obj_type);
894 if(rc) {
895 cFYI(1,("filldir rc = %d",rc));
896 /* we can not return filldir errors to the caller
897 since they are "normal" when the stat blocksize
898 is too small - we return remapped error instead */
899 rc = -EOVERFLOW;
900 }
901
902 dput(tmp_dentry);
903 return rc;
904 }
905
906 static int cifs_save_resume_key(const char *current_entry,
907 struct cifsFileInfo *cifsFile)
908 {
909 int rc = 0;
910 unsigned int len = 0;
911 __u16 level;
912 char * filename;
913
914 if((cifsFile == NULL) || (current_entry == NULL))
915 return -EINVAL;
916
917 level = cifsFile->srch_inf.info_level;
918
919 if(level == SMB_FIND_FILE_UNIX) {
920 FILE_UNIX_INFO * pFindData = (FILE_UNIX_INFO *)current_entry;
921
922 filename = &pFindData->FileName[0];
923 if(cifsFile->srch_inf.unicode) {
924 len = cifs_unicode_bytelen(filename);
925 } else {
926 /* BB should we make this strnlen of PATH_MAX? */
927 len = strnlen(filename, PATH_MAX);
928 }
929 cifsFile->srch_inf.resume_key = pFindData->ResumeKey;
930 } else if(level == SMB_FIND_FILE_DIRECTORY_INFO) {
931 FILE_DIRECTORY_INFO * pFindData =
932 (FILE_DIRECTORY_INFO *)current_entry;
933 filename = &pFindData->FileName[0];
934 len = le32_to_cpu(pFindData->FileNameLength);
935 cifsFile->srch_inf.resume_key = pFindData->FileIndex;
936 } else if(level == SMB_FIND_FILE_FULL_DIRECTORY_INFO) {
937 FILE_FULL_DIRECTORY_INFO * pFindData =
938 (FILE_FULL_DIRECTORY_INFO *)current_entry;
939 filename = &pFindData->FileName[0];
940 len = le32_to_cpu(pFindData->FileNameLength);
941 cifsFile->srch_inf.resume_key = pFindData->FileIndex;
942 } else if(level == SMB_FIND_FILE_ID_FULL_DIR_INFO) {
943 SEARCH_ID_FULL_DIR_INFO * pFindData =
944 (SEARCH_ID_FULL_DIR_INFO *)current_entry;
945 filename = &pFindData->FileName[0];
946 len = le32_to_cpu(pFindData->FileNameLength);
947 cifsFile->srch_inf.resume_key = pFindData->FileIndex;
948 } else if(level == SMB_FIND_FILE_BOTH_DIRECTORY_INFO) {
949 FILE_BOTH_DIRECTORY_INFO * pFindData =
950 (FILE_BOTH_DIRECTORY_INFO *)current_entry;
951 filename = &pFindData->FileName[0];
952 len = le32_to_cpu(pFindData->FileNameLength);
953 cifsFile->srch_inf.resume_key = pFindData->FileIndex;
954 } else if(level == SMB_FIND_FILE_INFO_STANDARD) {
955 FIND_FILE_STANDARD_INFO * pFindData =
956 (FIND_FILE_STANDARD_INFO *)current_entry;
957 filename = &pFindData->FileName[0];
958 /* one byte length, no name conversion */
959 len = (unsigned int)pFindData->FileNameLength;
960 cifsFile->srch_inf.resume_key = pFindData->ResumeKey;
961 } else {
962 cFYI(1,("Unknown findfirst level %d",level));
963 return -EINVAL;
964 }
965 cifsFile->srch_inf.resume_name_len = len;
966 cifsFile->srch_inf.presume_name = filename;
967 return rc;
968 }
969
970 int cifs_readdir(struct file *file, void *direntry, filldir_t filldir)
971 {
972 int rc = 0;
973 int xid,i;
974 struct cifs_sb_info *cifs_sb;
975 struct cifsTconInfo *pTcon;
976 struct cifsFileInfo *cifsFile = NULL;
977 char * current_entry;
978 int num_to_fill = 0;
979 char * tmp_buf = NULL;
980 char * end_of_smb;
981 int max_len;
982
983 xid = GetXid();
984
985 cifs_sb = CIFS_SB(file->f_path.dentry->d_sb);
986 pTcon = cifs_sb->tcon;
987 if(pTcon == NULL)
988 return -EINVAL;
989
990 switch ((int) file->f_pos) {
991 case 0:
992 if (filldir(direntry, ".", 1, file->f_pos,
993 file->f_path.dentry->d_inode->i_ino, DT_DIR) < 0) {
994 cERROR(1, ("Filldir for current dir failed"));
995 rc = -ENOMEM;
996 break;
997 }
998 file->f_pos++;
999 case 1:
1000 if (filldir(direntry, "..", 2, file->f_pos,
1001 file->f_path.dentry->d_parent->d_inode->i_ino, DT_DIR) < 0) {
1002 cERROR(1, ("Filldir for parent dir failed"));
1003 rc = -ENOMEM;
1004 break;
1005 }
1006 file->f_pos++;
1007 default:
1008 /* 1) If search is active,
1009 is in current search buffer?
1010 if it before then restart search
1011 if after then keep searching till find it */
1012
1013 if(file->private_data == NULL) {
1014 rc = initiate_cifs_search(xid,file);
1015 cFYI(1,("initiate cifs search rc %d",rc));
1016 if(rc) {
1017 FreeXid(xid);
1018 return rc;
1019 }
1020 }
1021 if(file->private_data == NULL) {
1022 rc = -EINVAL;
1023 FreeXid(xid);
1024 return rc;
1025 }
1026 cifsFile = file->private_data;
1027 if (cifsFile->srch_inf.endOfSearch) {
1028 if(cifsFile->srch_inf.emptyDir) {
1029 cFYI(1, ("End of search, empty dir"));
1030 rc = 0;
1031 break;
1032 }
1033 } /* else {
1034 cifsFile->invalidHandle = TRUE;
1035 CIFSFindClose(xid, pTcon, cifsFile->netfid);
1036 }
1037 kfree(cifsFile->search_resume_name);
1038 cifsFile->search_resume_name = NULL; */
1039
1040 rc = find_cifs_entry(xid,pTcon, file,
1041 &current_entry,&num_to_fill);
1042 if(rc) {
1043 cFYI(1,("fce error %d",rc));
1044 goto rddir2_exit;
1045 } else if (current_entry != NULL) {
1046 cFYI(1,("entry %lld found",file->f_pos));
1047 } else {
1048 cFYI(1,("could not find entry"));
1049 goto rddir2_exit;
1050 }
1051 cFYI(1,("loop through %d times filling dir for net buf %p",
1052 num_to_fill,cifsFile->srch_inf.ntwrk_buf_start));
1053 max_len = smbCalcSize((struct smb_hdr *)
1054 cifsFile->srch_inf.ntwrk_buf_start);
1055 end_of_smb = cifsFile->srch_inf.ntwrk_buf_start + max_len;
1056
1057 /* To be safe - for UCS to UTF-8 with strings loaded
1058 with the rare long characters alloc more to account for
1059 such multibyte target UTF-8 characters. cifs_unicode.c,
1060 which actually does the conversion, has the same limit */
1061 tmp_buf = kmalloc((2 * NAME_MAX) + 4, GFP_KERNEL);
1062 for(i=0;(i<num_to_fill) && (rc == 0);i++) {
1063 if(current_entry == NULL) {
1064 /* evaluate whether this case is an error */
1065 cERROR(1,("past end of SMB num to fill %d i %d",
1066 num_to_fill, i));
1067 break;
1068 }
1069 /* if buggy server returns . and .. late do
1070 we want to check for that here? */
1071 rc = cifs_filldir(current_entry, file,
1072 filldir, direntry, tmp_buf, max_len);
1073 if(rc == -EOVERFLOW) {
1074 rc = 0;
1075 break;
1076 }
1077
1078 file->f_pos++;
1079 if(file->f_pos ==
1080 cifsFile->srch_inf.index_of_last_entry) {
1081 cFYI(1,("last entry in buf at pos %lld %s",
1082 file->f_pos,tmp_buf));
1083 cifs_save_resume_key(current_entry,cifsFile);
1084 break;
1085 } else
1086 current_entry =
1087 nxt_dir_entry(current_entry, end_of_smb,
1088 cifsFile->srch_inf.info_level);
1089 }
1090 kfree(tmp_buf);
1091 break;
1092 } /* end switch */
1093
1094 rddir2_exit:
1095 FreeXid(xid);
1096 return rc;
1097 }
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