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thinkpad-acpi: simplify module autoloading
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / fs / cifs / readdir.c
blob0bdd5a6e5bb8cf847db4be349d3074d9883e1805
1 /*
2 * fs/cifs/readdir.c
3 *
4 * Directory search handling
5 *
6 * Copyright (C) International Business Machines Corp., 2004, 2008
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 if (cf->srch_inf.endOfSearch)
48 cFYI(1, ("end of search"));
49 if (cf->srch_inf.emptyDir)
50 cFYI(1, ("empty dir"));
51 }
52 }
53 #else
54 static inline void dump_cifs_file_struct(struct file *file, char *label)
55 {
56 }
57 #endif /* DEBUG2 */
58
59 /* Returns 1 if new inode created, 2 if both dentry and inode were */
60 /* Might check in the future if inode number changed so we can rehash inode */
61 static int
62 construct_dentry(struct qstr *qstring, struct file *file,
63 struct inode **ptmp_inode, struct dentry **pnew_dentry,
64 __u64 *inum)
65 {
66 struct dentry *tmp_dentry = NULL;
67 struct super_block *sb = file->f_path.dentry->d_sb;
68 int rc = 0;
69
70 cFYI(1, ("For %s", qstring->name));
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 /* BB: overwrite old name? i.e. tmp_dentry->d_name and
76 * tmp_dentry->d_name.len??
77 */
78 cFYI(0, ("existing dentry with inode 0x%p",
79 tmp_dentry->d_inode));
80 *ptmp_inode = tmp_dentry->d_inode;
81 if (*ptmp_inode == NULL) {
82 *ptmp_inode = cifs_new_inode(sb, inum);
83 if (*ptmp_inode == NULL)
84 return rc;
85 rc = 1;
86 }
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 if (CIFS_SB(sb)->tcon->nocase)
96 tmp_dentry->d_op = &cifs_ci_dentry_ops;
97 else
98 tmp_dentry->d_op = &cifs_dentry_ops;
99
100 *ptmp_inode = cifs_new_inode(sb, inum);
101 if (*ptmp_inode == NULL)
102 return rc;
103 rc = 2;
104 }
105
106 tmp_dentry->d_time = jiffies;
107 *pnew_dentry = tmp_dentry;
108 return rc;
109 }
110
111 static void AdjustForTZ(struct cifsTconInfo *tcon, struct inode *inode)
112 {
113 if ((tcon) && (tcon->ses) && (tcon->ses->server)) {
114 inode->i_ctime.tv_sec += tcon->ses->server->timeAdj;
115 inode->i_mtime.tv_sec += tcon->ses->server->timeAdj;
116 inode->i_atime.tv_sec += tcon->ses->server->timeAdj;
117 }
118 return;
119 }
120
121
122 static void fill_in_inode(struct inode *tmp_inode, int new_buf_type,
123 char *buf, unsigned int *pobject_type, int isNewInode)
124 {
125 loff_t local_size;
126 struct timespec local_mtime;
127
128 struct cifsInodeInfo *cifsInfo = CIFS_I(tmp_inode);
129 struct cifs_sb_info *cifs_sb = CIFS_SB(tmp_inode->i_sb);
130 __u32 attr;
131 __u64 allocation_size;
132 __u64 end_of_file;
133 umode_t default_mode;
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 }
190
191 if (attr & ATTR_DIRECTORY)
192 default_mode = cifs_sb->mnt_dir_mode;
193 else
194 default_mode = cifs_sb->mnt_file_mode;
195
196 /* set initial permissions */
197 if ((atomic_read(&cifsInfo->inUse) == 0) ||
198 (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DYNPERM) == 0)
199 tmp_inode->i_mode = default_mode;
200 else {
201 /* just reenable write bits if !ATTR_READONLY */
202 if ((tmp_inode->i_mode & S_IWUGO) == 0 &&
203 (attr & ATTR_READONLY) == 0)
204 tmp_inode->i_mode |= (S_IWUGO & default_mode);
205
206 tmp_inode->i_mode &= ~S_IFMT;
207 }
208
209 /* clear write bits if ATTR_READONLY is set */
210 if (attr & ATTR_READONLY)
211 tmp_inode->i_mode &= ~S_IWUGO;
212
213 /* set inode type */
214 if ((attr & ATTR_SYSTEM) &&
215 (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_UNX_EMUL)) {
216 if (end_of_file == 0) {
217 tmp_inode->i_mode |= S_IFIFO;
218 *pobject_type = DT_FIFO;
219 } else {
220 /*
221 * trying to get the type can be slow, so just call
222 * this a regular file for now, and mark for reval
223 */
224 tmp_inode->i_mode |= S_IFREG;
225 *pobject_type = DT_REG;
226 cifsInfo->time = 0;
227 }
228 } else {
229 if (attr & ATTR_DIRECTORY) {
230 tmp_inode->i_mode |= S_IFDIR;
231 *pobject_type = DT_DIR;
232 } else {
233 tmp_inode->i_mode |= S_IFREG;
234 *pobject_type = DT_REG;
235 }
236 }
237
238 /* can not fill in nlink here as in qpathinfo version and Unx search */
239 if (atomic_read(&cifsInfo->inUse) == 0)
240 atomic_set(&cifsInfo->inUse, 1);
241
242 spin_lock(&tmp_inode->i_lock);
243 if (is_size_safe_to_change(cifsInfo, end_of_file)) {
244 /* can not safely change the file size here if the
245 client is writing to it due to potential races */
246 i_size_write(tmp_inode, end_of_file);
247
248 /* 512 bytes (2**9) is the fake blocksize that must be used */
249 /* for this calculation, even though the reported blocksize is larger */
250 tmp_inode->i_blocks = (512 - 1 + allocation_size) >> 9;
251 }
252 spin_unlock(&tmp_inode->i_lock);
253
254 if (allocation_size < end_of_file)
255 cFYI(1, ("May be sparse file, allocation less than file size"));
256 cFYI(1, ("File Size %ld and blocks %llu",
257 (unsigned long)tmp_inode->i_size,
258 (unsigned long long)tmp_inode->i_blocks));
259 if (S_ISREG(tmp_inode->i_mode)) {
260 cFYI(1, ("File inode"));
261 tmp_inode->i_op = &cifs_file_inode_ops;
262 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DIRECT_IO) {
263 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_BRL)
264 tmp_inode->i_fop = &cifs_file_direct_nobrl_ops;
265 else
266 tmp_inode->i_fop = &cifs_file_direct_ops;
267 } else if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_BRL)
268 tmp_inode->i_fop = &cifs_file_nobrl_ops;
269 else
270 tmp_inode->i_fop = &cifs_file_ops;
271
272 if ((cifs_sb->tcon) && (cifs_sb->tcon->ses) &&
273 (cifs_sb->tcon->ses->server->maxBuf <
274 PAGE_CACHE_SIZE + MAX_CIFS_HDR_SIZE))
275 tmp_inode->i_data.a_ops = &cifs_addr_ops_smallbuf;
276 else
277 tmp_inode->i_data.a_ops = &cifs_addr_ops;
278
279 if (isNewInode)
280 return; /* No sense invalidating pages for new inode
281 since have not started caching readahead file
282 data yet */
283
284 if (timespec_equal(&tmp_inode->i_mtime, &local_mtime) &&
285 (local_size == tmp_inode->i_size)) {
286 cFYI(1, ("inode exists but unchanged"));
287 } else {
288 /* file may have changed on server */
289 cFYI(1, ("invalidate inode, readdir detected change"));
290 invalidate_remote_inode(tmp_inode);
291 }
292 } else if (S_ISDIR(tmp_inode->i_mode)) {
293 cFYI(1, ("Directory inode"));
294 tmp_inode->i_op = &cifs_dir_inode_ops;
295 tmp_inode->i_fop = &cifs_dir_ops;
296 } else if (S_ISLNK(tmp_inode->i_mode)) {
297 cFYI(1, ("Symbolic Link inode"));
298 tmp_inode->i_op = &cifs_symlink_inode_ops;
299 } else {
300 cFYI(1, ("Init special inode"));
301 init_special_inode(tmp_inode, tmp_inode->i_mode,
302 tmp_inode->i_rdev);
303 }
304 }
305
306 static void unix_fill_in_inode(struct inode *tmp_inode,
307 FILE_UNIX_INFO *pfindData, unsigned int *pobject_type, int isNewInode)
308 {
309 loff_t local_size;
310 struct timespec local_mtime;
311
312 struct cifsInodeInfo *cifsInfo = CIFS_I(tmp_inode);
313 struct cifs_sb_info *cifs_sb = CIFS_SB(tmp_inode->i_sb);
314
315 __u32 type = le32_to_cpu(pfindData->Type);
316 __u64 num_of_bytes = le64_to_cpu(pfindData->NumOfBytes);
317 __u64 end_of_file = le64_to_cpu(pfindData->EndOfFile);
318 cifsInfo->time = jiffies;
319 atomic_inc(&cifsInfo->inUse);
320
321 /* save mtime and size */
322 local_mtime = tmp_inode->i_mtime;
323 local_size = tmp_inode->i_size;
324
325 tmp_inode->i_atime =
326 cifs_NTtimeToUnix(le64_to_cpu(pfindData->LastAccessTime));
327 tmp_inode->i_mtime =
328 cifs_NTtimeToUnix(le64_to_cpu(pfindData->LastModificationTime));
329 tmp_inode->i_ctime =
330 cifs_NTtimeToUnix(le64_to_cpu(pfindData->LastStatusChange));
331
332 tmp_inode->i_mode = le64_to_cpu(pfindData->Permissions);
333 /* since we set the inode type below we need to mask off type
334 to avoid strange results if bits above were corrupt */
335 tmp_inode->i_mode &= ~S_IFMT;
336 if (type == UNIX_FILE) {
337 *pobject_type = DT_REG;
338 tmp_inode->i_mode |= S_IFREG;
339 } else if (type == UNIX_SYMLINK) {
340 *pobject_type = DT_LNK;
341 tmp_inode->i_mode |= S_IFLNK;
342 } else if (type == UNIX_DIR) {
343 *pobject_type = DT_DIR;
344 tmp_inode->i_mode |= S_IFDIR;
345 } else if (type == UNIX_CHARDEV) {
346 *pobject_type = DT_CHR;
347 tmp_inode->i_mode |= S_IFCHR;
348 tmp_inode->i_rdev = MKDEV(le64_to_cpu(pfindData->DevMajor),
349 le64_to_cpu(pfindData->DevMinor) & MINORMASK);
350 } else if (type == UNIX_BLOCKDEV) {
351 *pobject_type = DT_BLK;
352 tmp_inode->i_mode |= S_IFBLK;
353 tmp_inode->i_rdev = MKDEV(le64_to_cpu(pfindData->DevMajor),
354 le64_to_cpu(pfindData->DevMinor) & MINORMASK);
355 } else if (type == UNIX_FIFO) {
356 *pobject_type = DT_FIFO;
357 tmp_inode->i_mode |= S_IFIFO;
358 } else if (type == UNIX_SOCKET) {
359 *pobject_type = DT_SOCK;
360 tmp_inode->i_mode |= S_IFSOCK;
361 } else {
362 /* safest to just call it a file */
363 *pobject_type = DT_REG;
364 tmp_inode->i_mode |= S_IFREG;
365 cFYI(1, ("unknown inode type %d", type));
366 }
367
368 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_OVERR_UID)
369 tmp_inode->i_uid = cifs_sb->mnt_uid;
370 else
371 tmp_inode->i_uid = le64_to_cpu(pfindData->Uid);
372 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_OVERR_GID)
373 tmp_inode->i_gid = cifs_sb->mnt_gid;
374 else
375 tmp_inode->i_gid = le64_to_cpu(pfindData->Gid);
376 tmp_inode->i_nlink = le64_to_cpu(pfindData->Nlinks);
377
378 spin_lock(&tmp_inode->i_lock);
379 if (is_size_safe_to_change(cifsInfo, end_of_file)) {
380 /* can not safely change the file size here if the
381 client is writing to it due to potential races */
382 i_size_write(tmp_inode, end_of_file);
383
384 /* 512 bytes (2**9) is the fake blocksize that must be used */
385 /* for this calculation, not the real blocksize */
386 tmp_inode->i_blocks = (512 - 1 + num_of_bytes) >> 9;
387 }
388 spin_unlock(&tmp_inode->i_lock);
389
390 if (S_ISREG(tmp_inode->i_mode)) {
391 cFYI(1, ("File inode"));
392 tmp_inode->i_op = &cifs_file_inode_ops;
393
394 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DIRECT_IO) {
395 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_BRL)
396 tmp_inode->i_fop = &cifs_file_direct_nobrl_ops;
397 else
398 tmp_inode->i_fop = &cifs_file_direct_ops;
399 } else if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_BRL)
400 tmp_inode->i_fop = &cifs_file_nobrl_ops;
401 else
402 tmp_inode->i_fop = &cifs_file_ops;
403
404 if ((cifs_sb->tcon) && (cifs_sb->tcon->ses) &&
405 (cifs_sb->tcon->ses->server->maxBuf <
406 PAGE_CACHE_SIZE + MAX_CIFS_HDR_SIZE))
407 tmp_inode->i_data.a_ops = &cifs_addr_ops_smallbuf;
408 else
409 tmp_inode->i_data.a_ops = &cifs_addr_ops;
410
411 if (isNewInode)
412 return; /* No sense invalidating pages for new inode
413 since we have not started caching readahead
414 file data for it yet */
415
416 if (timespec_equal(&tmp_inode->i_mtime, &local_mtime) &&
417 (local_size == tmp_inode->i_size)) {
418 cFYI(1, ("inode exists but unchanged"));
419 } else {
420 /* file may have changed on server */
421 cFYI(1, ("invalidate inode, readdir detected change"));
422 invalidate_remote_inode(tmp_inode);
423 }
424 } else if (S_ISDIR(tmp_inode->i_mode)) {
425 cFYI(1, ("Directory inode"));
426 tmp_inode->i_op = &cifs_dir_inode_ops;
427 tmp_inode->i_fop = &cifs_dir_ops;
428 } else if (S_ISLNK(tmp_inode->i_mode)) {
429 cFYI(1, ("Symbolic Link inode"));
430 tmp_inode->i_op = &cifs_symlink_inode_ops;
431 /* tmp_inode->i_fop = *//* do not need to set to anything */
432 } else {
433 cFYI(1, ("Special inode"));
434 init_special_inode(tmp_inode, tmp_inode->i_mode,
435 tmp_inode->i_rdev);
436 }
437 }
438
439 static int initiate_cifs_search(const int xid, struct file *file)
440 {
441 int rc = 0;
442 char *full_path;
443 struct cifsFileInfo *cifsFile;
444 struct cifs_sb_info *cifs_sb;
445 struct cifsTconInfo *pTcon;
446
447 if (file->private_data == NULL) {
448 file->private_data =
449 kzalloc(sizeof(struct cifsFileInfo), GFP_KERNEL);
450 }
451
452 if (file->private_data == NULL)
453 return -ENOMEM;
454 cifsFile = file->private_data;
455 cifsFile->invalidHandle = true;
456 cifsFile->srch_inf.endOfSearch = false;
457
458 cifs_sb = CIFS_SB(file->f_path.dentry->d_sb);
459 if (cifs_sb == NULL)
460 return -EINVAL;
461
462 pTcon = cifs_sb->tcon;
463 if (pTcon == NULL)
464 return -EINVAL;
465
466 full_path = build_path_from_dentry(file->f_path.dentry);
467
468 if (full_path == NULL)
469 return -ENOMEM;
470
471 cFYI(1, ("Full path: %s start at: %lld", full_path, file->f_pos));
472
473 ffirst_retry:
474 /* test for Unix extensions */
475 /* but now check for them on the share/mount not on the SMB session */
476 /* if (pTcon->ses->capabilities & CAP_UNIX) { */
477 if (pTcon->unix_ext)
478 cifsFile->srch_inf.info_level = SMB_FIND_FILE_UNIX;
479 else if ((pTcon->ses->capabilities &
480 (CAP_NT_SMBS | CAP_NT_FIND)) == 0) {
481 cifsFile->srch_inf.info_level = SMB_FIND_FILE_INFO_STANDARD;
482 } else if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM) {
483 cifsFile->srch_inf.info_level = SMB_FIND_FILE_ID_FULL_DIR_INFO;
484 } else /* not srvinos - BB fixme add check for backlevel? */ {
485 cifsFile->srch_inf.info_level = SMB_FIND_FILE_DIRECTORY_INFO;
486 }
487
488 rc = CIFSFindFirst(xid, pTcon, full_path, cifs_sb->local_nls,
489 &cifsFile->netfid, &cifsFile->srch_inf,
490 cifs_sb->mnt_cifs_flags &
491 CIFS_MOUNT_MAP_SPECIAL_CHR, CIFS_DIR_SEP(cifs_sb));
492 if (rc == 0)
493 cifsFile->invalidHandle = false;
494 if ((rc == -EOPNOTSUPP) &&
495 (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM)) {
496 cifs_sb->mnt_cifs_flags &= ~CIFS_MOUNT_SERVER_INUM;
497 goto ffirst_retry;
498 }
499 kfree(full_path);
500 return rc;
501 }
502
503 /* return length of unicode string in bytes */
504 static int cifs_unicode_bytelen(char *str)
505 {
506 int len;
507 __le16 *ustr = (__le16 *)str;
508
509 for (len = 0; len <= PATH_MAX; len++) {
510 if (ustr[len] == 0)
511 return len << 1;
512 }
513 cFYI(1, ("Unicode string longer than PATH_MAX found"));
514 return len << 1;
515 }
516
517 static char *nxt_dir_entry(char *old_entry, char *end_of_smb, int level)
518 {
519 char *new_entry;
520 FILE_DIRECTORY_INFO *pDirInfo = (FILE_DIRECTORY_INFO *)old_entry;
521
522 if (level == SMB_FIND_FILE_INFO_STANDARD) {
523 FIND_FILE_STANDARD_INFO *pfData;
524 pfData = (FIND_FILE_STANDARD_INFO *)pDirInfo;
525
526 new_entry = old_entry + sizeof(FIND_FILE_STANDARD_INFO) +
527 pfData->FileNameLength;
528 } else
529 new_entry = old_entry + le32_to_cpu(pDirInfo->NextEntryOffset);
530 cFYI(1, ("new entry %p old entry %p", new_entry, old_entry));
531 /* validate that new_entry is not past end of SMB */
532 if (new_entry >= end_of_smb) {
533 cERROR(1,
534 ("search entry %p began after end of SMB %p old entry %p",
535 new_entry, end_of_smb, old_entry));
536 return NULL;
537 } else if (((level == SMB_FIND_FILE_INFO_STANDARD) &&
538 (new_entry + sizeof(FIND_FILE_STANDARD_INFO) > end_of_smb))
539 || ((level != SMB_FIND_FILE_INFO_STANDARD) &&
540 (new_entry + sizeof(FILE_DIRECTORY_INFO) > end_of_smb))) {
541 cERROR(1, ("search entry %p extends after end of SMB %p",
542 new_entry, end_of_smb));
543 return NULL;
544 } else
545 return new_entry;
546
547 }
548
549 #define UNICODE_DOT cpu_to_le16(0x2e)
550
551 /* return 0 if no match and 1 for . (current directory) and 2 for .. (parent) */
552 static int cifs_entry_is_dot(char *current_entry, struct cifsFileInfo *cfile)
553 {
554 int rc = 0;
555 char *filename = NULL;
556 int len = 0;
557
558 if (cfile->srch_inf.info_level == SMB_FIND_FILE_UNIX) {
559 FILE_UNIX_INFO *pFindData = (FILE_UNIX_INFO *)current_entry;
560 filename = &pFindData->FileName[0];
561 if (cfile->srch_inf.unicode) {
562 len = cifs_unicode_bytelen(filename);
563 } else {
564 /* BB should we make this strnlen of PATH_MAX? */
565 len = strnlen(filename, 5);
566 }
567 } else if (cfile->srch_inf.info_level == SMB_FIND_FILE_DIRECTORY_INFO) {
568 FILE_DIRECTORY_INFO *pFindData =
569 (FILE_DIRECTORY_INFO *)current_entry;
570 filename = &pFindData->FileName[0];
571 len = le32_to_cpu(pFindData->FileNameLength);
572 } else if (cfile->srch_inf.info_level ==
573 SMB_FIND_FILE_FULL_DIRECTORY_INFO) {
574 FILE_FULL_DIRECTORY_INFO *pFindData =
575 (FILE_FULL_DIRECTORY_INFO *)current_entry;
576 filename = &pFindData->FileName[0];
577 len = le32_to_cpu(pFindData->FileNameLength);
578 } else if (cfile->srch_inf.info_level ==
579 SMB_FIND_FILE_ID_FULL_DIR_INFO) {
580 SEARCH_ID_FULL_DIR_INFO *pFindData =
581 (SEARCH_ID_FULL_DIR_INFO *)current_entry;
582 filename = &pFindData->FileName[0];
583 len = le32_to_cpu(pFindData->FileNameLength);
584 } else if (cfile->srch_inf.info_level ==
585 SMB_FIND_FILE_BOTH_DIRECTORY_INFO) {
586 FILE_BOTH_DIRECTORY_INFO *pFindData =
587 (FILE_BOTH_DIRECTORY_INFO *)current_entry;
588 filename = &pFindData->FileName[0];
589 len = le32_to_cpu(pFindData->FileNameLength);
590 } else if (cfile->srch_inf.info_level == SMB_FIND_FILE_INFO_STANDARD) {
591 FIND_FILE_STANDARD_INFO *pFindData =
592 (FIND_FILE_STANDARD_INFO *)current_entry;
593 filename = &pFindData->FileName[0];
594 len = pFindData->FileNameLength;
595 } else {
596 cFYI(1, ("Unknown findfirst level %d",
597 cfile->srch_inf.info_level));
598 }
599
600 if (filename) {
601 if (cfile->srch_inf.unicode) {
602 __le16 *ufilename = (__le16 *)filename;
603 if (len == 2) {
604 /* check for . */
605 if (ufilename[0] == UNICODE_DOT)
606 rc = 1;
607 } else if (len == 4) {
608 /* check for .. */
609 if ((ufilename[0] == UNICODE_DOT)
610 && (ufilename[1] == UNICODE_DOT))
611 rc = 2;
612 }
613 } else /* ASCII */ {
614 if (len == 1) {
615 if (filename[0] == '.')
616 rc = 1;
617 } else if (len == 2) {
618 if ((filename[0] == '.') && (filename[1] == '.'))
619 rc = 2;
620 }
621 }
622 }
623
624 return rc;
625 }
626
627 /* Check if directory that we are searching has changed so we can decide
628 whether we can use the cached search results from the previous search */
629 static int is_dir_changed(struct file *file)
630 {
631 struct inode *inode = file->f_path.dentry->d_inode;
632 struct cifsInodeInfo *cifsInfo = CIFS_I(inode);
633
634 if (cifsInfo->time == 0)
635 return 1; /* directory was changed, perhaps due to unlink */
636 else
637 return 0;
638
639 }
640
641 static int cifs_save_resume_key(const char *current_entry,
642 struct cifsFileInfo *cifsFile)
643 {
644 int rc = 0;
645 unsigned int len = 0;
646 __u16 level;
647 char *filename;
648
649 if ((cifsFile == NULL) || (current_entry == NULL))
650 return -EINVAL;
651
652 level = cifsFile->srch_inf.info_level;
653
654 if (level == SMB_FIND_FILE_UNIX) {
655 FILE_UNIX_INFO *pFindData = (FILE_UNIX_INFO *)current_entry;
656
657 filename = &pFindData->FileName[0];
658 if (cifsFile->srch_inf.unicode) {
659 len = cifs_unicode_bytelen(filename);
660 } else {
661 /* BB should we make this strnlen of PATH_MAX? */
662 len = strnlen(filename, PATH_MAX);
663 }
664 cifsFile->srch_inf.resume_key = pFindData->ResumeKey;
665 } else if (level == SMB_FIND_FILE_DIRECTORY_INFO) {
666 FILE_DIRECTORY_INFO *pFindData =
667 (FILE_DIRECTORY_INFO *)current_entry;
668 filename = &pFindData->FileName[0];
669 len = le32_to_cpu(pFindData->FileNameLength);
670 cifsFile->srch_inf.resume_key = pFindData->FileIndex;
671 } else if (level == SMB_FIND_FILE_FULL_DIRECTORY_INFO) {
672 FILE_FULL_DIRECTORY_INFO *pFindData =
673 (FILE_FULL_DIRECTORY_INFO *)current_entry;
674 filename = &pFindData->FileName[0];
675 len = le32_to_cpu(pFindData->FileNameLength);
676 cifsFile->srch_inf.resume_key = pFindData->FileIndex;
677 } else if (level == SMB_FIND_FILE_ID_FULL_DIR_INFO) {
678 SEARCH_ID_FULL_DIR_INFO *pFindData =
679 (SEARCH_ID_FULL_DIR_INFO *)current_entry;
680 filename = &pFindData->FileName[0];
681 len = le32_to_cpu(pFindData->FileNameLength);
682 cifsFile->srch_inf.resume_key = pFindData->FileIndex;
683 } else if (level == SMB_FIND_FILE_BOTH_DIRECTORY_INFO) {
684 FILE_BOTH_DIRECTORY_INFO *pFindData =
685 (FILE_BOTH_DIRECTORY_INFO *)current_entry;
686 filename = &pFindData->FileName[0];
687 len = le32_to_cpu(pFindData->FileNameLength);
688 cifsFile->srch_inf.resume_key = pFindData->FileIndex;
689 } else if (level == SMB_FIND_FILE_INFO_STANDARD) {
690 FIND_FILE_STANDARD_INFO *pFindData =
691 (FIND_FILE_STANDARD_INFO *)current_entry;
692 filename = &pFindData->FileName[0];
693 /* one byte length, no name conversion */
694 len = (unsigned int)pFindData->FileNameLength;
695 cifsFile->srch_inf.resume_key = pFindData->ResumeKey;
696 } else {
697 cFYI(1, ("Unknown findfirst level %d", level));
698 return -EINVAL;
699 }
700 cifsFile->srch_inf.resume_name_len = len;
701 cifsFile->srch_inf.presume_name = filename;
702 return rc;
703 }
704
705 /* find the corresponding entry in the search */
706 /* Note that the SMB server returns search entries for . and .. which
707 complicates logic here if we choose to parse for them and we do not
708 assume that they are located in the findfirst return buffer.*/
709 /* We start counting in the buffer with entry 2 and increment for every
710 entry (do not increment for . or .. entry) */
711 static int find_cifs_entry(const int xid, struct cifsTconInfo *pTcon,
712 struct file *file, char **ppCurrentEntry, int *num_to_ret)
713 {
714 int rc = 0;
715 int pos_in_buf = 0;
716 loff_t first_entry_in_buffer;
717 loff_t index_to_find = file->f_pos;
718 struct cifsFileInfo *cifsFile = file->private_data;
719 /* check if index in the buffer */
720
721 if ((cifsFile == NULL) || (ppCurrentEntry == NULL) ||
722 (num_to_ret == NULL))
723 return -ENOENT;
724
725 *ppCurrentEntry = NULL;
726 first_entry_in_buffer =
727 cifsFile->srch_inf.index_of_last_entry -
728 cifsFile->srch_inf.entries_in_buffer;
729
730 /* if first entry in buf is zero then is first buffer
731 in search response data which means it is likely . and ..
732 will be in this buffer, although some servers do not return
733 . and .. for the root of a drive and for those we need
734 to start two entries earlier */
735
736 dump_cifs_file_struct(file, "In fce ");
737 if (((index_to_find < cifsFile->srch_inf.index_of_last_entry) &&
738 is_dir_changed(file)) ||
739 (index_to_find < first_entry_in_buffer)) {
740 /* close and restart search */
741 cFYI(1, ("search backing up - close and restart search"));
742 write_lock(&GlobalSMBSeslock);
743 if (!cifsFile->srch_inf.endOfSearch &&
744 !cifsFile->invalidHandle) {
745 cifsFile->invalidHandle = true;
746 write_unlock(&GlobalSMBSeslock);
747 CIFSFindClose(xid, pTcon, cifsFile->netfid);
748 } else
749 write_unlock(&GlobalSMBSeslock);
750 if (cifsFile->srch_inf.ntwrk_buf_start) {
751 cFYI(1, ("freeing SMB ff cache buf on search rewind"));
752 if (cifsFile->srch_inf.smallBuf)
753 cifs_small_buf_release(cifsFile->srch_inf.
754 ntwrk_buf_start);
755 else
756 cifs_buf_release(cifsFile->srch_inf.
757 ntwrk_buf_start);
758 cifsFile->srch_inf.ntwrk_buf_start = NULL;
759 }
760 rc = initiate_cifs_search(xid, file);
761 if (rc) {
762 cFYI(1, ("error %d reinitiating a search on rewind",
763 rc));
764 return rc;
765 }
766 cifs_save_resume_key(cifsFile->srch_inf.last_entry, cifsFile);
767 }
768
769 while ((index_to_find >= cifsFile->srch_inf.index_of_last_entry) &&
770 (rc == 0) && !cifsFile->srch_inf.endOfSearch) {
771 cFYI(1, ("calling findnext2"));
772 rc = CIFSFindNext(xid, pTcon, cifsFile->netfid,
773 &cifsFile->srch_inf);
774 cifs_save_resume_key(cifsFile->srch_inf.last_entry, cifsFile);
775 if (rc)
776 return -ENOENT;
777 }
778 if (index_to_find < cifsFile->srch_inf.index_of_last_entry) {
779 /* we found the buffer that contains the entry */
780 /* scan and find it */
781 int i;
782 char *current_entry;
783 char *end_of_smb = cifsFile->srch_inf.ntwrk_buf_start +
784 smbCalcSize((struct smb_hdr *)
785 cifsFile->srch_inf.ntwrk_buf_start);
786
787 current_entry = cifsFile->srch_inf.srch_entries_start;
788 first_entry_in_buffer = cifsFile->srch_inf.index_of_last_entry
789 - cifsFile->srch_inf.entries_in_buffer;
790 pos_in_buf = index_to_find - first_entry_in_buffer;
791 cFYI(1, ("found entry - pos_in_buf %d", pos_in_buf));
792
793 for (i = 0; (i < (pos_in_buf)) && (current_entry != NULL); i++) {
794 /* go entry by entry figuring out which is first */
795 current_entry = nxt_dir_entry(current_entry, end_of_smb,
796 cifsFile->srch_inf.info_level);
797 }
798 if ((current_entry == NULL) && (i < pos_in_buf)) {
799 /* BB fixme - check if we should flag this error */
800 cERROR(1, ("reached end of buf searching for pos in buf"
801 " %d index to find %lld rc %d",
802 pos_in_buf, index_to_find, rc));
803 }
804 rc = 0;
805 *ppCurrentEntry = current_entry;
806 } else {
807 cFYI(1, ("index not in buffer - could not findnext into it"));
808 return 0;
809 }
810
811 if (pos_in_buf >= cifsFile->srch_inf.entries_in_buffer) {
812 cFYI(1, ("can not return entries pos_in_buf beyond last"));
813 *num_to_ret = 0;
814 } else
815 *num_to_ret = cifsFile->srch_inf.entries_in_buffer - pos_in_buf;
816
817 return rc;
818 }
819
820 /* inode num, inode type and filename returned */
821 static int cifs_get_name_from_search_buf(struct qstr *pqst,
822 char *current_entry, __u16 level, unsigned int unicode,
823 struct cifs_sb_info *cifs_sb, int max_len, __u64 *pinum)
824 {
825 int rc = 0;
826 unsigned int len = 0;
827 char *filename;
828 struct nls_table *nlt = cifs_sb->local_nls;
829
830 *pinum = 0;
831
832 if (level == SMB_FIND_FILE_UNIX) {
833 FILE_UNIX_INFO *pFindData = (FILE_UNIX_INFO *)current_entry;
834
835 filename = &pFindData->FileName[0];
836 if (unicode) {
837 len = cifs_unicode_bytelen(filename);
838 } else {
839 /* BB should we make this strnlen of PATH_MAX? */
840 len = strnlen(filename, PATH_MAX);
841 }
842
843 *pinum = pFindData->UniqueId;
844 } else if (level == SMB_FIND_FILE_DIRECTORY_INFO) {
845 FILE_DIRECTORY_INFO *pFindData =
846 (FILE_DIRECTORY_INFO *)current_entry;
847 filename = &pFindData->FileName[0];
848 len = le32_to_cpu(pFindData->FileNameLength);
849 } else if (level == SMB_FIND_FILE_FULL_DIRECTORY_INFO) {
850 FILE_FULL_DIRECTORY_INFO *pFindData =
851 (FILE_FULL_DIRECTORY_INFO *)current_entry;
852 filename = &pFindData->FileName[0];
853 len = le32_to_cpu(pFindData->FileNameLength);
854 } else if (level == SMB_FIND_FILE_ID_FULL_DIR_INFO) {
855 SEARCH_ID_FULL_DIR_INFO *pFindData =
856 (SEARCH_ID_FULL_DIR_INFO *)current_entry;
857 filename = &pFindData->FileName[0];
858 len = le32_to_cpu(pFindData->FileNameLength);
859 *pinum = pFindData->UniqueId;
860 } else if (level == SMB_FIND_FILE_BOTH_DIRECTORY_INFO) {
861 FILE_BOTH_DIRECTORY_INFO *pFindData =
862 (FILE_BOTH_DIRECTORY_INFO *)current_entry;
863 filename = &pFindData->FileName[0];
864 len = le32_to_cpu(pFindData->FileNameLength);
865 } else if (level == SMB_FIND_FILE_INFO_STANDARD) {
866 FIND_FILE_STANDARD_INFO *pFindData =
867 (FIND_FILE_STANDARD_INFO *)current_entry;
868 filename = &pFindData->FileName[0];
869 /* one byte length, no name conversion */
870 len = (unsigned int)pFindData->FileNameLength;
871 } else {
872 cFYI(1, ("Unknown findfirst level %d", level));
873 return -EINVAL;
874 }
875
876 if (len > max_len) {
877 cERROR(1, ("bad search response length %d past smb end", len));
878 return -EINVAL;
879 }
880
881 if (unicode) {
882 /* BB fixme - test with long names */
883 /* Note converted filename can be longer than in unicode */
884 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR)
885 pqst->len = cifs_convertUCSpath((char *)pqst->name,
886 (__le16 *)filename, len/2, nlt);
887 else
888 pqst->len = cifs_strfromUCS_le((char *)pqst->name,
889 (__le16 *)filename, len/2, nlt);
890 } else {
891 pqst->name = filename;
892 pqst->len = len;
893 }
894 pqst->hash = full_name_hash(pqst->name, pqst->len);
895 /* cFYI(1, ("filldir on %s",pqst->name)); */
896 return rc;
897 }
898
899 static int cifs_filldir(char *pfindEntry, struct file *file,
900 filldir_t filldir, void *direntry, char *scratch_buf, int max_len)
901 {
902 int rc = 0;
903 struct qstr qstring;
904 struct cifsFileInfo *pCifsF;
905 unsigned int obj_type;
906 __u64 inum;
907 struct cifs_sb_info *cifs_sb;
908 struct inode *tmp_inode;
909 struct dentry *tmp_dentry;
910
911 /* get filename and len into qstring */
912 /* get dentry */
913 /* decide whether to create and populate ionde */
914 if ((direntry == NULL) || (file == NULL))
915 return -EINVAL;
916
917 pCifsF = file->private_data;
918
919 if ((scratch_buf == NULL) || (pfindEntry == NULL) || (pCifsF == NULL))
920 return -ENOENT;
921
922 rc = cifs_entry_is_dot(pfindEntry, pCifsF);
923 /* skip . and .. since we added them first */
924 if (rc != 0)
925 return 0;
926
927 cifs_sb = CIFS_SB(file->f_path.dentry->d_sb);
928
929 qstring.name = scratch_buf;
930 rc = cifs_get_name_from_search_buf(&qstring, pfindEntry,
931 pCifsF->srch_inf.info_level,
932 pCifsF->srch_inf.unicode, cifs_sb,
933 max_len,
934 &inum /* returned */);
935
936 if (rc)
937 return rc;
938
939 /* only these two infolevels return valid inode numbers */
940 if (pCifsF->srch_inf.info_level == SMB_FIND_FILE_UNIX ||
941 pCifsF->srch_inf.info_level == SMB_FIND_FILE_ID_FULL_DIR_INFO)
942 rc = construct_dentry(&qstring, file, &tmp_inode, &tmp_dentry,
943 &inum);
944 else
945 rc = construct_dentry(&qstring, file, &tmp_inode, &tmp_dentry,
946 NULL);
947
948 if ((tmp_inode == NULL) || (tmp_dentry == NULL))
949 return -ENOMEM;
950
951 /* we pass in rc below, indicating whether it is a new inode,
952 so we can figure out whether to invalidate the inode cached
953 data if the file has changed */
954 if (pCifsF->srch_inf.info_level == SMB_FIND_FILE_UNIX)
955 unix_fill_in_inode(tmp_inode,
956 (FILE_UNIX_INFO *)pfindEntry,
957 &obj_type, rc);
958 else if (pCifsF->srch_inf.info_level == SMB_FIND_FILE_INFO_STANDARD)
959 fill_in_inode(tmp_inode, 0 /* old level 1 buffer type */,
960 pfindEntry, &obj_type, rc);
961 else
962 fill_in_inode(tmp_inode, 1 /* NT */, pfindEntry, &obj_type, rc);
963
964 if (rc) /* new inode - needs to be tied to dentry */ {
965 d_instantiate(tmp_dentry, tmp_inode);
966 if (rc == 2)
967 d_rehash(tmp_dentry);
968 }
969
970
971 rc = filldir(direntry, qstring.name, qstring.len, file->f_pos,
972 tmp_inode->i_ino, obj_type);
973 if (rc) {
974 cFYI(1, ("filldir rc = %d", rc));
975 /* we can not return filldir errors to the caller
976 since they are "normal" when the stat blocksize
977 is too small - we return remapped error instead */
978 rc = -EOVERFLOW;
979 }
980
981 dput(tmp_dentry);
982 return rc;
983 }
984
985
986 int cifs_readdir(struct file *file, void *direntry, filldir_t filldir)
987 {
988 int rc = 0;
989 int xid, i;
990 struct cifs_sb_info *cifs_sb;
991 struct cifsTconInfo *pTcon;
992 struct cifsFileInfo *cifsFile = NULL;
993 char *current_entry;
994 int num_to_fill = 0;
995 char *tmp_buf = NULL;
996 char *end_of_smb;
997 int max_len;
998
999 xid = GetXid();
1000
1001 cifs_sb = CIFS_SB(file->f_path.dentry->d_sb);
1002 pTcon = cifs_sb->tcon;
1003 if (pTcon == NULL)
1004 return -EINVAL;
1005
1006 switch ((int) file->f_pos) {
1007 case 0:
1008 if (filldir(direntry, ".", 1, file->f_pos,
1009 file->f_path.dentry->d_inode->i_ino, DT_DIR) < 0) {
1010 cERROR(1, ("Filldir for current dir failed"));
1011 rc = -ENOMEM;
1012 break;
1013 }
1014 file->f_pos++;
1015 case 1:
1016 if (filldir(direntry, "..", 2, file->f_pos,
1017 file->f_path.dentry->d_parent->d_inode->i_ino, DT_DIR) < 0) {
1018 cERROR(1, ("Filldir for parent dir failed"));
1019 rc = -ENOMEM;
1020 break;
1021 }
1022 file->f_pos++;
1023 default:
1024 /* 1) If search is active,
1025 is in current search buffer?
1026 if it before then restart search
1027 if after then keep searching till find it */
1028
1029 if (file->private_data == NULL) {
1030 rc = initiate_cifs_search(xid, file);
1031 cFYI(1, ("initiate cifs search rc %d", rc));
1032 if (rc) {
1033 FreeXid(xid);
1034 return rc;
1035 }
1036 }
1037 if (file->private_data == NULL) {
1038 rc = -EINVAL;
1039 FreeXid(xid);
1040 return rc;
1041 }
1042 cifsFile = file->private_data;
1043 if (cifsFile->srch_inf.endOfSearch) {
1044 if (cifsFile->srch_inf.emptyDir) {
1045 cFYI(1, ("End of search, empty dir"));
1046 rc = 0;
1047 break;
1048 }
1049 } /* else {
1050 cifsFile->invalidHandle = true;
1051 CIFSFindClose(xid, pTcon, cifsFile->netfid);
1052 } */
1053
1054 rc = find_cifs_entry(xid, pTcon, file,
1055 &current_entry, &num_to_fill);
1056 if (rc) {
1057 cFYI(1, ("fce error %d", rc));
1058 goto rddir2_exit;
1059 } else if (current_entry != NULL) {
1060 cFYI(1, ("entry %lld found", file->f_pos));
1061 } else {
1062 cFYI(1, ("could not find entry"));
1063 goto rddir2_exit;
1064 }
1065 cFYI(1, ("loop through %d times filling dir for net buf %p",
1066 num_to_fill, cifsFile->srch_inf.ntwrk_buf_start));
1067 max_len = smbCalcSize((struct smb_hdr *)
1068 cifsFile->srch_inf.ntwrk_buf_start);
1069 end_of_smb = cifsFile->srch_inf.ntwrk_buf_start + max_len;
1070
1071 /* To be safe - for UCS to UTF-8 with strings loaded
1072 with the rare long characters alloc more to account for
1073 such multibyte target UTF-8 characters. cifs_unicode.c,
1074 which actually does the conversion, has the same limit */
1075 tmp_buf = kmalloc(UNICODE_NAME_MAX, GFP_KERNEL);
1076 for (i = 0; (i < num_to_fill) && (rc == 0); i++) {
1077 if (current_entry == NULL) {
1078 /* evaluate whether this case is an error */
1079 cERROR(1, ("past SMB end, num to fill %d i %d",
1080 num_to_fill, i));
1081 break;
1082 }
1083 /* if buggy server returns . and .. late do
1084 we want to check for that here? */
1085 rc = cifs_filldir(current_entry, file,
1086 filldir, direntry, tmp_buf, max_len);
1087 if (rc == -EOVERFLOW) {
1088 rc = 0;
1089 break;
1090 }
1091
1092 file->f_pos++;
1093 if (file->f_pos ==
1094 cifsFile->srch_inf.index_of_last_entry) {
1095 cFYI(1, ("last entry in buf at pos %lld %s",
1096 file->f_pos, tmp_buf));
1097 cifs_save_resume_key(current_entry, cifsFile);
1098 break;
1099 } else
1100 current_entry =
1101 nxt_dir_entry(current_entry, end_of_smb,
1102 cifsFile->srch_inf.info_level);
1103 }
1104 kfree(tmp_buf);
1105 break;
1106 } /* end switch */
1107
1108 rddir2_exit:
1109 FreeXid(xid);
1110 return rc;
1111 }
Linux 2.6 ibm-acpi/thinkpad-acpi driver git tree