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sched: make early bootup sched_clock() use safer
[wrt350n-kernel.git] / fs / cifs / readdir.c
blob0f22def4bdff47e30300dec9bcad5be12cd193d6
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 #endif /* DEBUG2 */
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_path.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_path.dentry, qstring);
74 if (tmp_dentry) {
75 cFYI(0, ("existing dentry with inode 0x%p",
76 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, unsigned 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 #ifdef CONFIG_CIFS_EXPERIMENTAL
175 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_CIFS_ACL) {
176 /* get more accurate mode via ACL - so force inode refresh */
177 cifsInfo->time = 0;
178 } else
179 #endif /* CONFIG_CIFS_EXPERIMENTAL */
180 cifsInfo->time = jiffies;
181
182 /* treat dos attribute of read-only as read-only mode bit e.g. 555? */
183 /* 2767 perms - indicate mandatory locking */
184 /* BB fill in uid and gid here? with help from winbind?
185 or retrieve from NTFS stream extended attribute */
186 if (atomic_read(&cifsInfo->inUse) == 0) {
187 tmp_inode->i_uid = cifs_sb->mnt_uid;
188 tmp_inode->i_gid = cifs_sb->mnt_gid;
189 /* set default mode. will override for dirs below */
190 tmp_inode->i_mode = cifs_sb->mnt_file_mode;
191 } else {
192 /* mask off the type bits since it gets set
193 below and we do not want to get two type
194 bits set */
195 tmp_inode->i_mode &= ~S_IFMT;
196 }
197
198 if (attr & ATTR_DIRECTORY) {
199 *pobject_type = DT_DIR;
200 /* override default perms since we do not lock dirs */
201 if (atomic_read(&cifsInfo->inUse) == 0) {
202 tmp_inode->i_mode = cifs_sb->mnt_dir_mode;
203 }
204 tmp_inode->i_mode |= S_IFDIR;
205 } else if ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_UNX_EMUL) &&
206 (attr & ATTR_SYSTEM)) {
207 if (end_of_file == 0) {
208 *pobject_type = DT_FIFO;
209 tmp_inode->i_mode |= S_IFIFO;
210 } else {
211 /* rather than get the type here, we mark the
212 inode as needing revalidate and get the real type
213 (blk vs chr vs. symlink) later ie in lookup */
214 *pobject_type = DT_REG;
215 tmp_inode->i_mode |= S_IFREG;
216 cifsInfo->time = 0;
217 }
218 /* we no longer mark these because we could not follow them */
219 /* } else if (attr & ATTR_REPARSE) {
220 *pobject_type = DT_LNK;
221 tmp_inode->i_mode |= S_IFLNK; */
222 } else {
223 *pobject_type = DT_REG;
224 tmp_inode->i_mode |= S_IFREG;
225 if (attr & ATTR_READONLY)
226 tmp_inode->i_mode &= ~(S_IWUGO);
227 else if ((tmp_inode->i_mode & S_IWUGO) == 0)
228 /* the ATTR_READONLY flag may have been changed on */
229 /* server -- set any w bits allowed by mnt_file_mode */
230 tmp_inode->i_mode |= (S_IWUGO & cifs_sb->mnt_file_mode);
231 } /* could add code here - to validate if device or weird share type? */
232
233 /* can not fill in nlink here as in qpathinfo version and Unx search */
234 if (atomic_read(&cifsInfo->inUse) == 0) {
235 atomic_set(&cifsInfo->inUse, 1);
236 }
237
238 spin_lock(&tmp_inode->i_lock);
239 if (is_size_safe_to_change(cifsInfo, end_of_file)) {
240 /* can not safely change the file size here if the
241 client is writing to it due to potential races */
242 i_size_write(tmp_inode, end_of_file);
243
244 /* 512 bytes (2**9) is the fake blocksize that must be used */
245 /* for this calculation, even though the reported blocksize is larger */
246 tmp_inode->i_blocks = (512 - 1 + allocation_size) >> 9;
247 }
248 spin_unlock(&tmp_inode->i_lock);
249
250 if (allocation_size < end_of_file)
251 cFYI(1, ("May be sparse file, allocation less than file size"));
252 cFYI(1, ("File Size %ld and blocks %llu",
253 (unsigned long)tmp_inode->i_size,
254 (unsigned long long)tmp_inode->i_blocks));
255 if (S_ISREG(tmp_inode->i_mode)) {
256 cFYI(1, ("File inode"));
257 tmp_inode->i_op = &cifs_file_inode_ops;
258 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DIRECT_IO) {
259 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_BRL)
260 tmp_inode->i_fop = &cifs_file_direct_nobrl_ops;
261 else
262 tmp_inode->i_fop = &cifs_file_direct_ops;
263 } else if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_BRL)
264 tmp_inode->i_fop = &cifs_file_nobrl_ops;
265 else
266 tmp_inode->i_fop = &cifs_file_ops;
267
268 if ((cifs_sb->tcon) && (cifs_sb->tcon->ses) &&
269 (cifs_sb->tcon->ses->server->maxBuf <
270 PAGE_CACHE_SIZE + MAX_CIFS_HDR_SIZE))
271 tmp_inode->i_data.a_ops = &cifs_addr_ops_smallbuf;
272 else
273 tmp_inode->i_data.a_ops = &cifs_addr_ops;
274
275 if (isNewInode)
276 return; /* No sense invalidating pages for new inode
277 since have not started caching readahead file
278 data yet */
279
280 if (timespec_equal(&tmp_inode->i_mtime, &local_mtime) &&
281 (local_size == tmp_inode->i_size)) {
282 cFYI(1, ("inode exists but unchanged"));
283 } else {
284 /* file may have changed on server */
285 cFYI(1, ("invalidate inode, readdir detected change"));
286 invalidate_remote_inode(tmp_inode);
287 }
288 } else if (S_ISDIR(tmp_inode->i_mode)) {
289 cFYI(1, ("Directory inode"));
290 tmp_inode->i_op = &cifs_dir_inode_ops;
291 tmp_inode->i_fop = &cifs_dir_ops;
292 } else if (S_ISLNK(tmp_inode->i_mode)) {
293 cFYI(1, ("Symbolic Link inode"));
294 tmp_inode->i_op = &cifs_symlink_inode_ops;
295 } else {
296 cFYI(1, ("Init special inode"));
297 init_special_inode(tmp_inode, tmp_inode->i_mode,
298 tmp_inode->i_rdev);
299 }
300 }
301
302 static void unix_fill_in_inode(struct inode *tmp_inode,
303 FILE_UNIX_INFO *pfindData, unsigned int *pobject_type, int isNewInode)
304 {
305 loff_t local_size;
306 struct timespec local_mtime;
307
308 struct cifsInodeInfo *cifsInfo = CIFS_I(tmp_inode);
309 struct cifs_sb_info *cifs_sb = CIFS_SB(tmp_inode->i_sb);
310
311 __u32 type = le32_to_cpu(pfindData->Type);
312 __u64 num_of_bytes = le64_to_cpu(pfindData->NumOfBytes);
313 __u64 end_of_file = le64_to_cpu(pfindData->EndOfFile);
314 cifsInfo->time = jiffies;
315 atomic_inc(&cifsInfo->inUse);
316
317 /* save mtime and size */
318 local_mtime = tmp_inode->i_mtime;
319 local_size = tmp_inode->i_size;
320
321 tmp_inode->i_atime =
322 cifs_NTtimeToUnix(le64_to_cpu(pfindData->LastAccessTime));
323 tmp_inode->i_mtime =
324 cifs_NTtimeToUnix(le64_to_cpu(pfindData->LastModificationTime));
325 tmp_inode->i_ctime =
326 cifs_NTtimeToUnix(le64_to_cpu(pfindData->LastStatusChange));
327
328 tmp_inode->i_mode = le64_to_cpu(pfindData->Permissions);
329 /* since we set the inode type below we need to mask off type
330 to avoid strange results if bits above were corrupt */
331 tmp_inode->i_mode &= ~S_IFMT;
332 if (type == UNIX_FILE) {
333 *pobject_type = DT_REG;
334 tmp_inode->i_mode |= S_IFREG;
335 } else if (type == UNIX_SYMLINK) {
336 *pobject_type = DT_LNK;
337 tmp_inode->i_mode |= S_IFLNK;
338 } else if (type == UNIX_DIR) {
339 *pobject_type = DT_DIR;
340 tmp_inode->i_mode |= S_IFDIR;
341 } else if (type == UNIX_CHARDEV) {
342 *pobject_type = DT_CHR;
343 tmp_inode->i_mode |= S_IFCHR;
344 tmp_inode->i_rdev = MKDEV(le64_to_cpu(pfindData->DevMajor),
345 le64_to_cpu(pfindData->DevMinor) & MINORMASK);
346 } else if (type == UNIX_BLOCKDEV) {
347 *pobject_type = DT_BLK;
348 tmp_inode->i_mode |= S_IFBLK;
349 tmp_inode->i_rdev = MKDEV(le64_to_cpu(pfindData->DevMajor),
350 le64_to_cpu(pfindData->DevMinor) & MINORMASK);
351 } else if (type == UNIX_FIFO) {
352 *pobject_type = DT_FIFO;
353 tmp_inode->i_mode |= S_IFIFO;
354 } else if (type == UNIX_SOCKET) {
355 *pobject_type = DT_SOCK;
356 tmp_inode->i_mode |= S_IFSOCK;
357 } else {
358 /* safest to just call it a file */
359 *pobject_type = DT_REG;
360 tmp_inode->i_mode |= S_IFREG;
361 cFYI(1, ("unknown inode type %d", type));
362 }
363
364 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_OVERR_UID)
365 tmp_inode->i_uid = cifs_sb->mnt_uid;
366 else
367 tmp_inode->i_uid = le64_to_cpu(pfindData->Uid);
368 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_OVERR_GID)
369 tmp_inode->i_gid = cifs_sb->mnt_gid;
370 else
371 tmp_inode->i_gid = le64_to_cpu(pfindData->Gid);
372 tmp_inode->i_nlink = le64_to_cpu(pfindData->Nlinks);
373
374 spin_lock(&tmp_inode->i_lock);
375 if (is_size_safe_to_change(cifsInfo, end_of_file)) {
376 /* can not safely change the file size here if the
377 client is writing to it due to potential races */
378 i_size_write(tmp_inode, end_of_file);
379
380 /* 512 bytes (2**9) is the fake blocksize that must be used */
381 /* for this calculation, not the real blocksize */
382 tmp_inode->i_blocks = (512 - 1 + num_of_bytes) >> 9;
383 }
384 spin_unlock(&tmp_inode->i_lock);
385
386 if (S_ISREG(tmp_inode->i_mode)) {
387 cFYI(1, ("File inode"));
388 tmp_inode->i_op = &cifs_file_inode_ops;
389
390 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DIRECT_IO) {
391 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_BRL)
392 tmp_inode->i_fop = &cifs_file_direct_nobrl_ops;
393 else
394 tmp_inode->i_fop = &cifs_file_direct_ops;
395 } else if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_BRL)
396 tmp_inode->i_fop = &cifs_file_nobrl_ops;
397 else
398 tmp_inode->i_fop = &cifs_file_ops;
399
400 if ((cifs_sb->tcon) && (cifs_sb->tcon->ses) &&
401 (cifs_sb->tcon->ses->server->maxBuf <
402 PAGE_CACHE_SIZE + MAX_CIFS_HDR_SIZE))
403 tmp_inode->i_data.a_ops = &cifs_addr_ops_smallbuf;
404 else
405 tmp_inode->i_data.a_ops = &cifs_addr_ops;
406
407 if (isNewInode)
408 return; /* No sense invalidating pages for new inode
409 since we have not started caching readahead
410 file data for it yet */
411
412 if (timespec_equal(&tmp_inode->i_mtime, &local_mtime) &&
413 (local_size == tmp_inode->i_size)) {
414 cFYI(1, ("inode exists but unchanged"));
415 } else {
416 /* file may have changed on server */
417 cFYI(1, ("invalidate inode, readdir detected change"));
418 invalidate_remote_inode(tmp_inode);
419 }
420 } else if (S_ISDIR(tmp_inode->i_mode)) {
421 cFYI(1, ("Directory inode"));
422 tmp_inode->i_op = &cifs_dir_inode_ops;
423 tmp_inode->i_fop = &cifs_dir_ops;
424 } else if (S_ISLNK(tmp_inode->i_mode)) {
425 cFYI(1, ("Symbolic Link inode"));
426 tmp_inode->i_op = &cifs_symlink_inode_ops;
427 /* tmp_inode->i_fop = *//* do not need to set to anything */
428 } else {
429 cFYI(1, ("Special inode"));
430 init_special_inode(tmp_inode, tmp_inode->i_mode,
431 tmp_inode->i_rdev);
432 }
433 }
434
435 static int initiate_cifs_search(const int xid, struct file *file)
436 {
437 int rc = 0;
438 char *full_path;
439 struct cifsFileInfo *cifsFile;
440 struct cifs_sb_info *cifs_sb;
441 struct cifsTconInfo *pTcon;
442
443 if (file->private_data == NULL) {
444 file->private_data =
445 kzalloc(sizeof(struct cifsFileInfo), GFP_KERNEL);
446 }
447
448 if (file->private_data == NULL)
449 return -ENOMEM;
450 cifsFile = file->private_data;
451 cifsFile->invalidHandle = TRUE;
452 cifsFile->srch_inf.endOfSearch = FALSE;
453
454 cifs_sb = CIFS_SB(file->f_path.dentry->d_sb);
455 if (cifs_sb == NULL)
456 return -EINVAL;
457
458 pTcon = cifs_sb->tcon;
459 if (pTcon == NULL)
460 return -EINVAL;
461
462 full_path = build_path_from_dentry(file->f_path.dentry);
463
464 if (full_path == NULL) {
465 return -ENOMEM;
466 }
467
468 cFYI(1, ("Full path: %s start at: %lld", full_path, file->f_pos));
469
470 ffirst_retry:
471 /* test for Unix extensions */
472 /* but now check for them on the share/mount not on the SMB session */
473 /* if (pTcon->ses->capabilities & CAP_UNIX) { */
474 if (pTcon->unix_ext) {
475 cifsFile->srch_inf.info_level = SMB_FIND_FILE_UNIX;
476 } else if ((pTcon->ses->capabilities &
477 (CAP_NT_SMBS | CAP_NT_FIND)) == 0) {
478 cifsFile->srch_inf.info_level = SMB_FIND_FILE_INFO_STANDARD;
479 } else if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM) {
480 cifsFile->srch_inf.info_level = SMB_FIND_FILE_ID_FULL_DIR_INFO;
481 } else /* not srvinos - BB fixme add check for backlevel? */ {
482 cifsFile->srch_inf.info_level = SMB_FIND_FILE_DIRECTORY_INFO;
483 }
484
485 rc = CIFSFindFirst(xid, pTcon, full_path, cifs_sb->local_nls,
486 &cifsFile->netfid, &cifsFile->srch_inf,
487 cifs_sb->mnt_cifs_flags &
488 CIFS_MOUNT_MAP_SPECIAL_CHR, CIFS_DIR_SEP(cifs_sb));
489 if (rc == 0)
490 cifsFile->invalidHandle = FALSE;
491 if ((rc == -EOPNOTSUPP) &&
492 (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM)) {
493 cifs_sb->mnt_cifs_flags &= ~CIFS_MOUNT_SERVER_INUM;
494 goto ffirst_retry;
495 }
496 kfree(full_path);
497 return rc;
498 }
499
500 /* return length of unicode string in bytes */
501 static int cifs_unicode_bytelen(char *str)
502 {
503 int len;
504 __le16 *ustr = (__le16 *)str;
505
506 for (len = 0; len <= PATH_MAX; len++) {
507 if (ustr[len] == 0)
508 return len << 1;
509 }
510 cFYI(1, ("Unicode string longer than PATH_MAX found"));
511 return len << 1;
512 }
513
514 static char *nxt_dir_entry(char *old_entry, char *end_of_smb, int level)
515 {
516 char *new_entry;
517 FILE_DIRECTORY_INFO * pDirInfo = (FILE_DIRECTORY_INFO *)old_entry;
518
519 if (level == SMB_FIND_FILE_INFO_STANDARD) {
520 FIND_FILE_STANDARD_INFO * pfData;
521 pfData = (FIND_FILE_STANDARD_INFO *)pDirInfo;
522
523 new_entry = old_entry + sizeof(FIND_FILE_STANDARD_INFO) +
524 pfData->FileNameLength;
525 } else
526 new_entry = old_entry + le32_to_cpu(pDirInfo->NextEntryOffset);
527 cFYI(1, ("new entry %p old entry %p", new_entry, old_entry));
528 /* validate that new_entry is not past end of SMB */
529 if (new_entry >= end_of_smb) {
530 cERROR(1,
531 ("search entry %p began after end of SMB %p old entry %p",
532 new_entry, end_of_smb, old_entry));
533 return NULL;
534 } else if (((level == SMB_FIND_FILE_INFO_STANDARD) &&
535 (new_entry + sizeof(FIND_FILE_STANDARD_INFO) > end_of_smb))
536 || ((level != SMB_FIND_FILE_INFO_STANDARD) &&
537 (new_entry + sizeof(FILE_DIRECTORY_INFO) > end_of_smb))) {
538 cERROR(1, ("search entry %p extends after end of SMB %p",
539 new_entry, end_of_smb));
540 return NULL;
541 } else
542 return new_entry;
543
544 }
545
546 #define UNICODE_DOT cpu_to_le16(0x2e)
547
548 /* return 0 if no match and 1 for . (current directory) and 2 for .. (parent) */
549 static int cifs_entry_is_dot(char *current_entry, struct cifsFileInfo *cfile)
550 {
551 int rc = 0;
552 char *filename = NULL;
553 int len = 0;
554
555 if (cfile->srch_inf.info_level == SMB_FIND_FILE_UNIX) {
556 FILE_UNIX_INFO * pFindData = (FILE_UNIX_INFO *)current_entry;
557 filename = &pFindData->FileName[0];
558 if (cfile->srch_inf.unicode) {
559 len = cifs_unicode_bytelen(filename);
560 } else {
561 /* BB should we make this strnlen of PATH_MAX? */
562 len = strnlen(filename, 5);
563 }
564 } else if (cfile->srch_inf.info_level == SMB_FIND_FILE_DIRECTORY_INFO) {
565 FILE_DIRECTORY_INFO * pFindData =
566 (FILE_DIRECTORY_INFO *)current_entry;
567 filename = &pFindData->FileName[0];
568 len = le32_to_cpu(pFindData->FileNameLength);
569 } else if (cfile->srch_inf.info_level ==
570 SMB_FIND_FILE_FULL_DIRECTORY_INFO) {
571 FILE_FULL_DIRECTORY_INFO * pFindData =
572 (FILE_FULL_DIRECTORY_INFO *)current_entry;
573 filename = &pFindData->FileName[0];
574 len = le32_to_cpu(pFindData->FileNameLength);
575 } else if (cfile->srch_inf.info_level ==
576 SMB_FIND_FILE_ID_FULL_DIR_INFO) {
577 SEARCH_ID_FULL_DIR_INFO * pFindData =
578 (SEARCH_ID_FULL_DIR_INFO *)current_entry;
579 filename = &pFindData->FileName[0];
580 len = le32_to_cpu(pFindData->FileNameLength);
581 } else if (cfile->srch_inf.info_level ==
582 SMB_FIND_FILE_BOTH_DIRECTORY_INFO) {
583 FILE_BOTH_DIRECTORY_INFO * pFindData =
584 (FILE_BOTH_DIRECTORY_INFO *)current_entry;
585 filename = &pFindData->FileName[0];
586 len = le32_to_cpu(pFindData->FileNameLength);
587 } else if (cfile->srch_inf.info_level == SMB_FIND_FILE_INFO_STANDARD) {
588 FIND_FILE_STANDARD_INFO * pFindData =
589 (FIND_FILE_STANDARD_INFO *)current_entry;
590 filename = &pFindData->FileName[0];
591 len = pFindData->FileNameLength;
592 } else {
593 cFYI(1, ("Unknown findfirst level %d",
594 cfile->srch_inf.info_level));
595 }
596
597 if (filename) {
598 if (cfile->srch_inf.unicode) {
599 __le16 *ufilename = (__le16 *)filename;
600 if (len == 2) {
601 /* check for . */
602 if (ufilename[0] == UNICODE_DOT)
603 rc = 1;
604 } else if (len == 4) {
605 /* check for .. */
606 if ((ufilename[0] == UNICODE_DOT)
607 && (ufilename[1] == UNICODE_DOT))
608 rc = 2;
609 }
610 } else /* ASCII */ {
611 if (len == 1) {
612 if (filename[0] == '.')
613 rc = 1;
614 } else if (len == 2) {
615 if ((filename[0] == '.') && (filename[1] == '.'))
616 rc = 2;
617 }
618 }
619 }
620
621 return rc;
622 }
623
624 /* Check if directory that we are searching has changed so we can decide
625 whether we can use the cached search results from the previous search */
626 static int is_dir_changed(struct file *file)
627 {
628 struct inode *inode = file->f_path.dentry->d_inode;
629 struct cifsInodeInfo *cifsInfo = CIFS_I(inode);
630
631 if (cifsInfo->time == 0)
632 return 1; /* directory was changed, perhaps due to unlink */
633 else
634 return 0;
635
636 }
637
638 /* find the corresponding entry in the search */
639 /* Note that the SMB server returns search entries for . and .. which
640 complicates logic here if we choose to parse for them and we do not
641 assume that they are located in the findfirst return buffer.*/
642 /* We start counting in the buffer with entry 2 and increment for every
643 entry (do not increment for . or .. entry) */
644 static int find_cifs_entry(const int xid, struct cifsTconInfo *pTcon,
645 struct file *file, char **ppCurrentEntry, int *num_to_ret)
646 {
647 int rc = 0;
648 int pos_in_buf = 0;
649 loff_t first_entry_in_buffer;
650 loff_t index_to_find = file->f_pos;
651 struct cifsFileInfo *cifsFile = file->private_data;
652 /* check if index in the buffer */
653
654 if ((cifsFile == NULL) || (ppCurrentEntry == NULL) ||
655 (num_to_ret == NULL))
656 return -ENOENT;
657
658 *ppCurrentEntry = NULL;
659 first_entry_in_buffer =
660 cifsFile->srch_inf.index_of_last_entry -
661 cifsFile->srch_inf.entries_in_buffer;
662
663 /* if first entry in buf is zero then is first buffer
664 in search response data which means it is likely . and ..
665 will be in this buffer, although some servers do not return
666 . and .. for the root of a drive and for those we need
667 to start two entries earlier */
668
669 #ifdef CONFIG_CIFS_DEBUG2
670 dump_cifs_file_struct(file, "In fce ");
671 #endif
672 if (((index_to_find < cifsFile->srch_inf.index_of_last_entry) &&
673 is_dir_changed(file)) ||
674 (index_to_find < first_entry_in_buffer)) {
675 /* close and restart search */
676 cFYI(1, ("search backing up - close and restart search"));
677 cifsFile->invalidHandle = TRUE;
678 CIFSFindClose(xid, pTcon, cifsFile->netfid);
679 kfree(cifsFile->search_resume_name);
680 cifsFile->search_resume_name = NULL;
681 if (cifsFile->srch_inf.ntwrk_buf_start) {
682 cFYI(1, ("freeing SMB ff cache buf on search rewind"));
683 if (cifsFile->srch_inf.smallBuf)
684 cifs_small_buf_release(cifsFile->srch_inf.
685 ntwrk_buf_start);
686 else
687 cifs_buf_release(cifsFile->srch_inf.
688 ntwrk_buf_start);
689 }
690 rc = initiate_cifs_search(xid, file);
691 if (rc) {
692 cFYI(1, ("error %d reinitiating a search on rewind",
693 rc));
694 return rc;
695 }
696 }
697
698 while ((index_to_find >= cifsFile->srch_inf.index_of_last_entry) &&
699 (rc == 0) && (cifsFile->srch_inf.endOfSearch == FALSE)) {
700 cFYI(1, ("calling findnext2"));
701 rc = CIFSFindNext(xid, pTcon, cifsFile->netfid,
702 &cifsFile->srch_inf);
703 if (rc)
704 return -ENOENT;
705 }
706 if (index_to_find < cifsFile->srch_inf.index_of_last_entry) {
707 /* we found the buffer that contains the entry */
708 /* scan and find it */
709 int i;
710 char *current_entry;
711 char *end_of_smb = cifsFile->srch_inf.ntwrk_buf_start +
712 smbCalcSize((struct smb_hdr *)
713 cifsFile->srch_inf.ntwrk_buf_start);
714
715 current_entry = cifsFile->srch_inf.srch_entries_start;
716 first_entry_in_buffer = cifsFile->srch_inf.index_of_last_entry
717 - cifsFile->srch_inf.entries_in_buffer;
718 pos_in_buf = index_to_find - first_entry_in_buffer;
719 cFYI(1, ("found entry - pos_in_buf %d", pos_in_buf));
720
721 for (i=0; (i < (pos_in_buf)) && (current_entry != NULL); i++) {
722 /* go entry by entry figuring out which is first */
723 current_entry = nxt_dir_entry(current_entry, end_of_smb,
724 cifsFile->srch_inf.info_level);
725 }
726 if ((current_entry == NULL) && (i < pos_in_buf)) {
727 /* BB fixme - check if we should flag this error */
728 cERROR(1, ("reached end of buf searching for pos in buf"
729 " %d index to find %lld rc %d",
730 pos_in_buf, index_to_find, rc));
731 }
732 rc = 0;
733 *ppCurrentEntry = current_entry;
734 } else {
735 cFYI(1, ("index not in buffer - could not findnext into it"));
736 return 0;
737 }
738
739 if (pos_in_buf >= cifsFile->srch_inf.entries_in_buffer) {
740 cFYI(1, ("can not return entries pos_in_buf beyond last"));
741 *num_to_ret = 0;
742 } else
743 *num_to_ret = cifsFile->srch_inf.entries_in_buffer - pos_in_buf;
744
745 return rc;
746 }
747
748 /* inode num, inode type and filename returned */
749 static int cifs_get_name_from_search_buf(struct qstr *pqst,
750 char *current_entry, __u16 level, unsigned int unicode,
751 struct cifs_sb_info *cifs_sb, int max_len, ino_t *pinum)
752 {
753 int rc = 0;
754 unsigned int len = 0;
755 char *filename;
756 struct nls_table *nlt = cifs_sb->local_nls;
757
758 *pinum = 0;
759
760 if (level == SMB_FIND_FILE_UNIX) {
761 FILE_UNIX_INFO *pFindData = (FILE_UNIX_INFO *)current_entry;
762
763 filename = &pFindData->FileName[0];
764 if (unicode) {
765 len = cifs_unicode_bytelen(filename);
766 } else {
767 /* BB should we make this strnlen of PATH_MAX? */
768 len = strnlen(filename, PATH_MAX);
769 }
770
771 /* BB fixme - hash low and high 32 bits if not 64 bit arch BB */
772 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM)
773 *pinum = pFindData->UniqueId;
774 } else if (level == SMB_FIND_FILE_DIRECTORY_INFO) {
775 FILE_DIRECTORY_INFO *pFindData =
776 (FILE_DIRECTORY_INFO *)current_entry;
777 filename = &pFindData->FileName[0];
778 len = le32_to_cpu(pFindData->FileNameLength);
779 } else if (level == SMB_FIND_FILE_FULL_DIRECTORY_INFO) {
780 FILE_FULL_DIRECTORY_INFO *pFindData =
781 (FILE_FULL_DIRECTORY_INFO *)current_entry;
782 filename = &pFindData->FileName[0];
783 len = le32_to_cpu(pFindData->FileNameLength);
784 } else if (level == SMB_FIND_FILE_ID_FULL_DIR_INFO) {
785 SEARCH_ID_FULL_DIR_INFO *pFindData =
786 (SEARCH_ID_FULL_DIR_INFO *)current_entry;
787 filename = &pFindData->FileName[0];
788 len = le32_to_cpu(pFindData->FileNameLength);
789 *pinum = pFindData->UniqueId;
790 } else if (level == SMB_FIND_FILE_BOTH_DIRECTORY_INFO) {
791 FILE_BOTH_DIRECTORY_INFO *pFindData =
792 (FILE_BOTH_DIRECTORY_INFO *)current_entry;
793 filename = &pFindData->FileName[0];
794 len = le32_to_cpu(pFindData->FileNameLength);
795 } else if (level == SMB_FIND_FILE_INFO_STANDARD) {
796 FIND_FILE_STANDARD_INFO * pFindData =
797 (FIND_FILE_STANDARD_INFO *)current_entry;
798 filename = &pFindData->FileName[0];
799 /* one byte length, no name conversion */
800 len = (unsigned int)pFindData->FileNameLength;
801 } else {
802 cFYI(1, ("Unknown findfirst level %d", level));
803 return -EINVAL;
804 }
805
806 if (len > max_len) {
807 cERROR(1, ("bad search response length %d past smb end", len));
808 return -EINVAL;
809 }
810
811 if (unicode) {
812 /* BB fixme - test with long names */
813 /* Note converted filename can be longer than in unicode */
814 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR)
815 pqst->len = cifs_convertUCSpath((char *)pqst->name,
816 (__le16 *)filename, len/2, nlt);
817 else
818 pqst->len = cifs_strfromUCS_le((char *)pqst->name,
819 (__le16 *)filename, len/2, nlt);
820 } else {
821 pqst->name = filename;
822 pqst->len = len;
823 }
824 pqst->hash = full_name_hash(pqst->name, pqst->len);
825 /* cFYI(1, ("filldir on %s",pqst->name)); */
826 return rc;
827 }
828
829 static int cifs_filldir(char *pfindEntry, struct file *file,
830 filldir_t filldir, void *direntry, char *scratch_buf, int max_len)
831 {
832 int rc = 0;
833 struct qstr qstring;
834 struct cifsFileInfo *pCifsF;
835 unsigned int obj_type;
836 ino_t inum;
837 struct cifs_sb_info *cifs_sb;
838 struct inode *tmp_inode;
839 struct dentry *tmp_dentry;
840
841 /* get filename and len into qstring */
842 /* get dentry */
843 /* decide whether to create and populate ionde */
844 if ((direntry == NULL) || (file == NULL))
845 return -EINVAL;
846
847 pCifsF = file->private_data;
848
849 if ((scratch_buf == NULL) || (pfindEntry == NULL) || (pCifsF == NULL))
850 return -ENOENT;
851
852 rc = cifs_entry_is_dot(pfindEntry, pCifsF);
853 /* skip . and .. since we added them first */
854 if (rc != 0)
855 return 0;
856
857 cifs_sb = CIFS_SB(file->f_path.dentry->d_sb);
858
859 qstring.name = scratch_buf;
860 rc = cifs_get_name_from_search_buf(&qstring, pfindEntry,
861 pCifsF->srch_inf.info_level,
862 pCifsF->srch_inf.unicode, cifs_sb,
863 max_len,
864 &inum /* returned */);
865
866 if (rc)
867 return rc;
868
869 rc = construct_dentry(&qstring, file, &tmp_inode, &tmp_dentry);
870 if ((tmp_inode == NULL) || (tmp_dentry == NULL))
871 return -ENOMEM;
872
873 if (rc) {
874 /* inode created, we need to hash it with right inode number */
875 if (inum != 0) {
876 /* BB fixme - hash the 2 32 quantities bits together if
877 * necessary BB */
878 tmp_inode->i_ino = inum;
879 }
880 insert_inode_hash(tmp_inode);
881 }
882
883 /* we pass in rc below, indicating whether it is a new inode,
884 so we can figure out whether to invalidate the inode cached
885 data if the file has changed */
886 if (pCifsF->srch_inf.info_level == SMB_FIND_FILE_UNIX)
887 unix_fill_in_inode(tmp_inode,
888 (FILE_UNIX_INFO *)pfindEntry,
889 &obj_type, rc);
890 else if (pCifsF->srch_inf.info_level == SMB_FIND_FILE_INFO_STANDARD)
891 fill_in_inode(tmp_inode, 0 /* old level 1 buffer type */,
892 pfindEntry, &obj_type, rc);
893 else
894 fill_in_inode(tmp_inode, 1 /* NT */, pfindEntry, &obj_type, rc);
895
896 if (rc) /* new inode - needs to be tied to dentry */ {
897 d_instantiate(tmp_dentry, tmp_inode);
898 if (rc == 2)
899 d_rehash(tmp_dentry);
900 }
901
902
903 rc = filldir(direntry, qstring.name, qstring.len, file->f_pos,
904 tmp_inode->i_ino, obj_type);
905 if (rc) {
906 cFYI(1, ("filldir rc = %d", rc));
907 /* we can not return filldir errors to the caller
908 since they are "normal" when the stat blocksize
909 is too small - we return remapped error instead */
910 rc = -EOVERFLOW;
911 }
912
913 dput(tmp_dentry);
914 return rc;
915 }
916
917 static int cifs_save_resume_key(const char *current_entry,
918 struct cifsFileInfo *cifsFile)
919 {
920 int rc = 0;
921 unsigned int len = 0;
922 __u16 level;
923 char *filename;
924
925 if ((cifsFile == NULL) || (current_entry == NULL))
926 return -EINVAL;
927
928 level = cifsFile->srch_inf.info_level;
929
930 if (level == SMB_FIND_FILE_UNIX) {
931 FILE_UNIX_INFO * pFindData = (FILE_UNIX_INFO *)current_entry;
932
933 filename = &pFindData->FileName[0];
934 if (cifsFile->srch_inf.unicode) {
935 len = cifs_unicode_bytelen(filename);
936 } else {
937 /* BB should we make this strnlen of PATH_MAX? */
938 len = strnlen(filename, PATH_MAX);
939 }
940 cifsFile->srch_inf.resume_key = pFindData->ResumeKey;
941 } else if (level == SMB_FIND_FILE_DIRECTORY_INFO) {
942 FILE_DIRECTORY_INFO *pFindData =
943 (FILE_DIRECTORY_INFO *)current_entry;
944 filename = &pFindData->FileName[0];
945 len = le32_to_cpu(pFindData->FileNameLength);
946 cifsFile->srch_inf.resume_key = pFindData->FileIndex;
947 } else if (level == SMB_FIND_FILE_FULL_DIRECTORY_INFO) {
948 FILE_FULL_DIRECTORY_INFO *pFindData =
949 (FILE_FULL_DIRECTORY_INFO *)current_entry;
950 filename = &pFindData->FileName[0];
951 len = le32_to_cpu(pFindData->FileNameLength);
952 cifsFile->srch_inf.resume_key = pFindData->FileIndex;
953 } else if (level == SMB_FIND_FILE_ID_FULL_DIR_INFO) {
954 SEARCH_ID_FULL_DIR_INFO *pFindData =
955 (SEARCH_ID_FULL_DIR_INFO *)current_entry;
956 filename = &pFindData->FileName[0];
957 len = le32_to_cpu(pFindData->FileNameLength);
958 cifsFile->srch_inf.resume_key = pFindData->FileIndex;
959 } else if (level == SMB_FIND_FILE_BOTH_DIRECTORY_INFO) {
960 FILE_BOTH_DIRECTORY_INFO *pFindData =
961 (FILE_BOTH_DIRECTORY_INFO *)current_entry;
962 filename = &pFindData->FileName[0];
963 len = le32_to_cpu(pFindData->FileNameLength);
964 cifsFile->srch_inf.resume_key = pFindData->FileIndex;
965 } else if (level == SMB_FIND_FILE_INFO_STANDARD) {
966 FIND_FILE_STANDARD_INFO *pFindData =
967 (FIND_FILE_STANDARD_INFO *)current_entry;
968 filename = &pFindData->FileName[0];
969 /* one byte length, no name conversion */
970 len = (unsigned int)pFindData->FileNameLength;
971 cifsFile->srch_inf.resume_key = pFindData->ResumeKey;
972 } else {
973 cFYI(1, ("Unknown findfirst level %d", level));
974 return -EINVAL;
975 }
976 cifsFile->srch_inf.resume_name_len = len;
977 cifsFile->srch_inf.presume_name = filename;
978 return rc;
979 }
980
981 int cifs_readdir(struct file *file, void *direntry, filldir_t filldir)
982 {
983 int rc = 0;
984 int xid, i;
985 struct cifs_sb_info *cifs_sb;
986 struct cifsTconInfo *pTcon;
987 struct cifsFileInfo *cifsFile = NULL;
988 char *current_entry;
989 int num_to_fill = 0;
990 char *tmp_buf = NULL;
991 char *end_of_smb;
992 int max_len;
993
994 xid = GetXid();
995
996 cifs_sb = CIFS_SB(file->f_path.dentry->d_sb);
997 pTcon = cifs_sb->tcon;
998 if (pTcon == NULL)
999 return -EINVAL;
1000
1001 switch ((int) file->f_pos) {
1002 case 0:
1003 if (filldir(direntry, ".", 1, file->f_pos,
1004 file->f_path.dentry->d_inode->i_ino, DT_DIR) < 0) {
1005 cERROR(1, ("Filldir for current dir failed"));
1006 rc = -ENOMEM;
1007 break;
1008 }
1009 file->f_pos++;
1010 case 1:
1011 if (filldir(direntry, "..", 2, file->f_pos,
1012 file->f_path.dentry->d_parent->d_inode->i_ino, DT_DIR) < 0) {
1013 cERROR(1, ("Filldir for parent dir failed"));
1014 rc = -ENOMEM;
1015 break;
1016 }
1017 file->f_pos++;
1018 default:
1019 /* 1) If search is active,
1020 is in current search buffer?
1021 if it before then restart search
1022 if after then keep searching till find it */
1023
1024 if (file->private_data == NULL) {
1025 rc = initiate_cifs_search(xid, file);
1026 cFYI(1, ("initiate cifs search rc %d", rc));
1027 if (rc) {
1028 FreeXid(xid);
1029 return rc;
1030 }
1031 }
1032 if (file->private_data == NULL) {
1033 rc = -EINVAL;
1034 FreeXid(xid);
1035 return rc;
1036 }
1037 cifsFile = file->private_data;
1038 if (cifsFile->srch_inf.endOfSearch) {
1039 if (cifsFile->srch_inf.emptyDir) {
1040 cFYI(1, ("End of search, empty dir"));
1041 rc = 0;
1042 break;
1043 }
1044 } /* else {
1045 cifsFile->invalidHandle = TRUE;
1046 CIFSFindClose(xid, pTcon, cifsFile->netfid);
1047 }
1048 kfree(cifsFile->search_resume_name);
1049 cifsFile->search_resume_name = NULL; */
1050
1051 rc = find_cifs_entry(xid, pTcon, file,
1052 &current_entry, &num_to_fill);
1053 if (rc) {
1054 cFYI(1, ("fce error %d", rc));
1055 goto rddir2_exit;
1056 } else if (current_entry != NULL) {
1057 cFYI(1, ("entry %lld found", file->f_pos));
1058 } else {
1059 cFYI(1, ("could not find entry"));
1060 goto rddir2_exit;
1061 }
1062 cFYI(1, ("loop through %d times filling dir for net buf %p",
1063 num_to_fill, cifsFile->srch_inf.ntwrk_buf_start));
1064 max_len = smbCalcSize((struct smb_hdr *)
1065 cifsFile->srch_inf.ntwrk_buf_start);
1066 end_of_smb = cifsFile->srch_inf.ntwrk_buf_start + max_len;
1067
1068 /* To be safe - for UCS to UTF-8 with strings loaded
1069 with the rare long characters alloc more to account for
1070 such multibyte target UTF-8 characters. cifs_unicode.c,
1071 which actually does the conversion, has the same limit */
1072 tmp_buf = kmalloc((2 * NAME_MAX) + 4, GFP_KERNEL);
1073 for (i = 0; (i < num_to_fill) && (rc == 0); i++) {
1074 if (current_entry == NULL) {
1075 /* evaluate whether this case is an error */
1076 cERROR(1, ("past SMB end, num to fill %d i %d",
1077 num_to_fill, i));
1078 break;
1079 }
1080 /* if buggy server returns . and .. late do
1081 we want to check for that here? */
1082 rc = cifs_filldir(current_entry, file,
1083 filldir, direntry, tmp_buf, max_len);
1084 if (rc == -EOVERFLOW) {
1085 rc = 0;
1086 break;
1087 }
1088
1089 file->f_pos++;
1090 if (file->f_pos ==
1091 cifsFile->srch_inf.index_of_last_entry) {
1092 cFYI(1, ("last entry in buf at pos %lld %s",
1093 file->f_pos, tmp_buf));
1094 cifs_save_resume_key(current_entry, cifsFile);
1095 break;
1096 } else
1097 current_entry =
1098 nxt_dir_entry(current_entry, end_of_smb,
1099 cifsFile->srch_inf.info_level);
1100 }
1101 kfree(tmp_buf);
1102 break;
1103 } /* end switch */
1104
1105 rddir2_exit:
1106 FreeXid(xid);
1107 return rc;
1108 }
WRT350N Kernel Patches