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intel-iommu: Fix one last ia64 build problem in Pass Through Support
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / fs / cifs / readdir.c
blob1a8be6228333a146aa7f3e00f168ee2d4461fc72
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 cifsInfo->server_eof = end_of_file;
243 spin_lock(&tmp_inode->i_lock);
244 if (is_size_safe_to_change(cifsInfo, end_of_file)) {
245 /* can not safely change the file size here if the
246 client is writing to it due to potential races */
247 i_size_write(tmp_inode, end_of_file);
248
249 /* 512 bytes (2**9) is the fake blocksize that must be used */
250 /* for this calculation, even though the reported blocksize is larger */
251 tmp_inode->i_blocks = (512 - 1 + allocation_size) >> 9;
252 }
253 spin_unlock(&tmp_inode->i_lock);
254
255 if (allocation_size < end_of_file)
256 cFYI(1, ("May be sparse file, allocation less than file size"));
257 cFYI(1, ("File Size %ld and blocks %llu",
258 (unsigned long)tmp_inode->i_size,
259 (unsigned long long)tmp_inode->i_blocks));
260 if (S_ISREG(tmp_inode->i_mode)) {
261 cFYI(1, ("File inode"));
262 tmp_inode->i_op = &cifs_file_inode_ops;
263 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DIRECT_IO) {
264 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_BRL)
265 tmp_inode->i_fop = &cifs_file_direct_nobrl_ops;
266 else
267 tmp_inode->i_fop = &cifs_file_direct_ops;
268 } else if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_BRL)
269 tmp_inode->i_fop = &cifs_file_nobrl_ops;
270 else
271 tmp_inode->i_fop = &cifs_file_ops;
272
273 if ((cifs_sb->tcon) && (cifs_sb->tcon->ses) &&
274 (cifs_sb->tcon->ses->server->maxBuf <
275 PAGE_CACHE_SIZE + MAX_CIFS_HDR_SIZE))
276 tmp_inode->i_data.a_ops = &cifs_addr_ops_smallbuf;
277 else
278 tmp_inode->i_data.a_ops = &cifs_addr_ops;
279
280 if (isNewInode)
281 return; /* No sense invalidating pages for new inode
282 since have not started caching readahead file
283 data yet */
284
285 if (timespec_equal(&tmp_inode->i_mtime, &local_mtime) &&
286 (local_size == tmp_inode->i_size)) {
287 cFYI(1, ("inode exists but unchanged"));
288 } else {
289 /* file may have changed on server */
290 cFYI(1, ("invalidate inode, readdir detected change"));
291 invalidate_remote_inode(tmp_inode);
292 }
293 } else if (S_ISDIR(tmp_inode->i_mode)) {
294 cFYI(1, ("Directory inode"));
295 tmp_inode->i_op = &cifs_dir_inode_ops;
296 tmp_inode->i_fop = &cifs_dir_ops;
297 } else if (S_ISLNK(tmp_inode->i_mode)) {
298 cFYI(1, ("Symbolic Link inode"));
299 tmp_inode->i_op = &cifs_symlink_inode_ops;
300 } else {
301 cFYI(1, ("Init special inode"));
302 init_special_inode(tmp_inode, tmp_inode->i_mode,
303 tmp_inode->i_rdev);
304 }
305 }
306
307 static void unix_fill_in_inode(struct inode *tmp_inode,
308 FILE_UNIX_INFO *pfindData, unsigned int *pobject_type, int isNewInode)
309 {
310 loff_t local_size;
311 struct timespec local_mtime;
312
313 struct cifsInodeInfo *cifsInfo = CIFS_I(tmp_inode);
314 struct cifs_sb_info *cifs_sb = CIFS_SB(tmp_inode->i_sb);
315
316 __u32 type = le32_to_cpu(pfindData->Type);
317 __u64 num_of_bytes = le64_to_cpu(pfindData->NumOfBytes);
318 __u64 end_of_file = le64_to_cpu(pfindData->EndOfFile);
319 cifsInfo->time = jiffies;
320 atomic_inc(&cifsInfo->inUse);
321
322 /* save mtime and size */
323 local_mtime = tmp_inode->i_mtime;
324 local_size = tmp_inode->i_size;
325
326 tmp_inode->i_atime =
327 cifs_NTtimeToUnix(le64_to_cpu(pfindData->LastAccessTime));
328 tmp_inode->i_mtime =
329 cifs_NTtimeToUnix(le64_to_cpu(pfindData->LastModificationTime));
330 tmp_inode->i_ctime =
331 cifs_NTtimeToUnix(le64_to_cpu(pfindData->LastStatusChange));
332
333 tmp_inode->i_mode = le64_to_cpu(pfindData->Permissions);
334 /* since we set the inode type below we need to mask off type
335 to avoid strange results if bits above were corrupt */
336 tmp_inode->i_mode &= ~S_IFMT;
337 if (type == UNIX_FILE) {
338 *pobject_type = DT_REG;
339 tmp_inode->i_mode |= S_IFREG;
340 } else if (type == UNIX_SYMLINK) {
341 *pobject_type = DT_LNK;
342 tmp_inode->i_mode |= S_IFLNK;
343 } else if (type == UNIX_DIR) {
344 *pobject_type = DT_DIR;
345 tmp_inode->i_mode |= S_IFDIR;
346 } else if (type == UNIX_CHARDEV) {
347 *pobject_type = DT_CHR;
348 tmp_inode->i_mode |= S_IFCHR;
349 tmp_inode->i_rdev = MKDEV(le64_to_cpu(pfindData->DevMajor),
350 le64_to_cpu(pfindData->DevMinor) & MINORMASK);
351 } else if (type == UNIX_BLOCKDEV) {
352 *pobject_type = DT_BLK;
353 tmp_inode->i_mode |= S_IFBLK;
354 tmp_inode->i_rdev = MKDEV(le64_to_cpu(pfindData->DevMajor),
355 le64_to_cpu(pfindData->DevMinor) & MINORMASK);
356 } else if (type == UNIX_FIFO) {
357 *pobject_type = DT_FIFO;
358 tmp_inode->i_mode |= S_IFIFO;
359 } else if (type == UNIX_SOCKET) {
360 *pobject_type = DT_SOCK;
361 tmp_inode->i_mode |= S_IFSOCK;
362 } else {
363 /* safest to just call it a file */
364 *pobject_type = DT_REG;
365 tmp_inode->i_mode |= S_IFREG;
366 cFYI(1, ("unknown inode type %d", type));
367 }
368
369 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_OVERR_UID)
370 tmp_inode->i_uid = cifs_sb->mnt_uid;
371 else
372 tmp_inode->i_uid = le64_to_cpu(pfindData->Uid);
373 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_OVERR_GID)
374 tmp_inode->i_gid = cifs_sb->mnt_gid;
375 else
376 tmp_inode->i_gid = le64_to_cpu(pfindData->Gid);
377 tmp_inode->i_nlink = le64_to_cpu(pfindData->Nlinks);
378
379 cifsInfo->server_eof = end_of_file;
380 spin_lock(&tmp_inode->i_lock);
381 if (is_size_safe_to_change(cifsInfo, end_of_file)) {
382 /* can not safely change the file size here if the
383 client is writing to it due to potential races */
384 i_size_write(tmp_inode, end_of_file);
385
386 /* 512 bytes (2**9) is the fake blocksize that must be used */
387 /* for this calculation, not the real blocksize */
388 tmp_inode->i_blocks = (512 - 1 + num_of_bytes) >> 9;
389 }
390 spin_unlock(&tmp_inode->i_lock);
391
392 if (S_ISREG(tmp_inode->i_mode)) {
393 cFYI(1, ("File inode"));
394 tmp_inode->i_op = &cifs_file_inode_ops;
395
396 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DIRECT_IO) {
397 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_BRL)
398 tmp_inode->i_fop = &cifs_file_direct_nobrl_ops;
399 else
400 tmp_inode->i_fop = &cifs_file_direct_ops;
401 } else if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_BRL)
402 tmp_inode->i_fop = &cifs_file_nobrl_ops;
403 else
404 tmp_inode->i_fop = &cifs_file_ops;
405
406 if ((cifs_sb->tcon) && (cifs_sb->tcon->ses) &&
407 (cifs_sb->tcon->ses->server->maxBuf <
408 PAGE_CACHE_SIZE + MAX_CIFS_HDR_SIZE))
409 tmp_inode->i_data.a_ops = &cifs_addr_ops_smallbuf;
410 else
411 tmp_inode->i_data.a_ops = &cifs_addr_ops;
412
413 if (isNewInode)
414 return; /* No sense invalidating pages for new inode
415 since we have not started caching readahead
416 file data for it yet */
417
418 if (timespec_equal(&tmp_inode->i_mtime, &local_mtime) &&
419 (local_size == tmp_inode->i_size)) {
420 cFYI(1, ("inode exists but unchanged"));
421 } else {
422 /* file may have changed on server */
423 cFYI(1, ("invalidate inode, readdir detected change"));
424 invalidate_remote_inode(tmp_inode);
425 }
426 } else if (S_ISDIR(tmp_inode->i_mode)) {
427 cFYI(1, ("Directory inode"));
428 tmp_inode->i_op = &cifs_dir_inode_ops;
429 tmp_inode->i_fop = &cifs_dir_ops;
430 } else if (S_ISLNK(tmp_inode->i_mode)) {
431 cFYI(1, ("Symbolic Link inode"));
432 tmp_inode->i_op = &cifs_symlink_inode_ops;
433 /* tmp_inode->i_fop = *//* do not need to set to anything */
434 } else {
435 cFYI(1, ("Special inode"));
436 init_special_inode(tmp_inode, tmp_inode->i_mode,
437 tmp_inode->i_rdev);
438 }
439 }
440
441 static int initiate_cifs_search(const int xid, struct file *file)
442 {
443 int rc = 0;
444 char *full_path;
445 struct cifsFileInfo *cifsFile;
446 struct cifs_sb_info *cifs_sb;
447 struct cifsTconInfo *pTcon;
448
449 if (file->private_data == NULL) {
450 file->private_data =
451 kzalloc(sizeof(struct cifsFileInfo), GFP_KERNEL);
452 }
453
454 if (file->private_data == NULL)
455 return -ENOMEM;
456 cifsFile = file->private_data;
457 cifsFile->invalidHandle = true;
458 cifsFile->srch_inf.endOfSearch = false;
459
460 cifs_sb = CIFS_SB(file->f_path.dentry->d_sb);
461 if (cifs_sb == NULL)
462 return -EINVAL;
463
464 pTcon = cifs_sb->tcon;
465 if (pTcon == NULL)
466 return -EINVAL;
467
468 full_path = build_path_from_dentry(file->f_path.dentry);
469
470 if (full_path == NULL)
471 return -ENOMEM;
472
473 cFYI(1, ("Full path: %s start at: %lld", full_path, file->f_pos));
474
475 ffirst_retry:
476 /* test for Unix extensions */
477 /* but now check for them on the share/mount not on the SMB session */
478 /* if (pTcon->ses->capabilities & CAP_UNIX) { */
479 if (pTcon->unix_ext)
480 cifsFile->srch_inf.info_level = SMB_FIND_FILE_UNIX;
481 else if ((pTcon->ses->capabilities &
482 (CAP_NT_SMBS | CAP_NT_FIND)) == 0) {
483 cifsFile->srch_inf.info_level = SMB_FIND_FILE_INFO_STANDARD;
484 } else if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM) {
485 cifsFile->srch_inf.info_level = SMB_FIND_FILE_ID_FULL_DIR_INFO;
486 } else /* not srvinos - BB fixme add check for backlevel? */ {
487 cifsFile->srch_inf.info_level = SMB_FIND_FILE_DIRECTORY_INFO;
488 }
489
490 rc = CIFSFindFirst(xid, pTcon, full_path, cifs_sb->local_nls,
491 &cifsFile->netfid, &cifsFile->srch_inf,
492 cifs_sb->mnt_cifs_flags &
493 CIFS_MOUNT_MAP_SPECIAL_CHR, CIFS_DIR_SEP(cifs_sb));
494 if (rc == 0)
495 cifsFile->invalidHandle = false;
496 if ((rc == -EOPNOTSUPP) &&
497 (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM)) {
498 cifs_sb->mnt_cifs_flags &= ~CIFS_MOUNT_SERVER_INUM;
499 goto ffirst_retry;
500 }
501 kfree(full_path);
502 return rc;
503 }
504
505 /* return length of unicode string in bytes */
506 static int cifs_unicode_bytelen(char *str)
507 {
508 int len;
509 __le16 *ustr = (__le16 *)str;
510
511 for (len = 0; len <= PATH_MAX; len++) {
512 if (ustr[len] == 0)
513 return len << 1;
514 }
515 cFYI(1, ("Unicode string longer than PATH_MAX found"));
516 return len << 1;
517 }
518
519 static char *nxt_dir_entry(char *old_entry, char *end_of_smb, int level)
520 {
521 char *new_entry;
522 FILE_DIRECTORY_INFO *pDirInfo = (FILE_DIRECTORY_INFO *)old_entry;
523
524 if (level == SMB_FIND_FILE_INFO_STANDARD) {
525 FIND_FILE_STANDARD_INFO *pfData;
526 pfData = (FIND_FILE_STANDARD_INFO *)pDirInfo;
527
528 new_entry = old_entry + sizeof(FIND_FILE_STANDARD_INFO) +
529 pfData->FileNameLength;
530 } else
531 new_entry = old_entry + le32_to_cpu(pDirInfo->NextEntryOffset);
532 cFYI(1, ("new entry %p old entry %p", new_entry, old_entry));
533 /* validate that new_entry is not past end of SMB */
534 if (new_entry >= end_of_smb) {
535 cERROR(1,
536 ("search entry %p began after end of SMB %p old entry %p",
537 new_entry, end_of_smb, old_entry));
538 return NULL;
539 } else if (((level == SMB_FIND_FILE_INFO_STANDARD) &&
540 (new_entry + sizeof(FIND_FILE_STANDARD_INFO) > end_of_smb))
541 || ((level != SMB_FIND_FILE_INFO_STANDARD) &&
542 (new_entry + sizeof(FILE_DIRECTORY_INFO) > end_of_smb))) {
543 cERROR(1, ("search entry %p extends after end of SMB %p",
544 new_entry, end_of_smb));
545 return NULL;
546 } else
547 return new_entry;
548
549 }
550
551 #define UNICODE_DOT cpu_to_le16(0x2e)
552
553 /* return 0 if no match and 1 for . (current directory) and 2 for .. (parent) */
554 static int cifs_entry_is_dot(char *current_entry, struct cifsFileInfo *cfile)
555 {
556 int rc = 0;
557 char *filename = NULL;
558 int len = 0;
559
560 if (cfile->srch_inf.info_level == SMB_FIND_FILE_UNIX) {
561 FILE_UNIX_INFO *pFindData = (FILE_UNIX_INFO *)current_entry;
562 filename = &pFindData->FileName[0];
563 if (cfile->srch_inf.unicode) {
564 len = cifs_unicode_bytelen(filename);
565 } else {
566 /* BB should we make this strnlen of PATH_MAX? */
567 len = strnlen(filename, 5);
568 }
569 } else if (cfile->srch_inf.info_level == SMB_FIND_FILE_DIRECTORY_INFO) {
570 FILE_DIRECTORY_INFO *pFindData =
571 (FILE_DIRECTORY_INFO *)current_entry;
572 filename = &pFindData->FileName[0];
573 len = le32_to_cpu(pFindData->FileNameLength);
574 } else if (cfile->srch_inf.info_level ==
575 SMB_FIND_FILE_FULL_DIRECTORY_INFO) {
576 FILE_FULL_DIRECTORY_INFO *pFindData =
577 (FILE_FULL_DIRECTORY_INFO *)current_entry;
578 filename = &pFindData->FileName[0];
579 len = le32_to_cpu(pFindData->FileNameLength);
580 } else if (cfile->srch_inf.info_level ==
581 SMB_FIND_FILE_ID_FULL_DIR_INFO) {
582 SEARCH_ID_FULL_DIR_INFO *pFindData =
583 (SEARCH_ID_FULL_DIR_INFO *)current_entry;
584 filename = &pFindData->FileName[0];
585 len = le32_to_cpu(pFindData->FileNameLength);
586 } else if (cfile->srch_inf.info_level ==
587 SMB_FIND_FILE_BOTH_DIRECTORY_INFO) {
588 FILE_BOTH_DIRECTORY_INFO *pFindData =
589 (FILE_BOTH_DIRECTORY_INFO *)current_entry;
590 filename = &pFindData->FileName[0];
591 len = le32_to_cpu(pFindData->FileNameLength);
592 } else if (cfile->srch_inf.info_level == SMB_FIND_FILE_INFO_STANDARD) {
593 FIND_FILE_STANDARD_INFO *pFindData =
594 (FIND_FILE_STANDARD_INFO *)current_entry;
595 filename = &pFindData->FileName[0];
596 len = pFindData->FileNameLength;
597 } else {
598 cFYI(1, ("Unknown findfirst level %d",
599 cfile->srch_inf.info_level));
600 }
601
602 if (filename) {
603 if (cfile->srch_inf.unicode) {
604 __le16 *ufilename = (__le16 *)filename;
605 if (len == 2) {
606 /* check for . */
607 if (ufilename[0] == UNICODE_DOT)
608 rc = 1;
609 } else if (len == 4) {
610 /* check for .. */
611 if ((ufilename[0] == UNICODE_DOT)
612 && (ufilename[1] == UNICODE_DOT))
613 rc = 2;
614 }
615 } else /* ASCII */ {
616 if (len == 1) {
617 if (filename[0] == '.')
618 rc = 1;
619 } else if (len == 2) {
620 if ((filename[0] == '.') && (filename[1] == '.'))
621 rc = 2;
622 }
623 }
624 }
625
626 return rc;
627 }
628
629 /* Check if directory that we are searching has changed so we can decide
630 whether we can use the cached search results from the previous search */
631 static int is_dir_changed(struct file *file)
632 {
633 struct inode *inode = file->f_path.dentry->d_inode;
634 struct cifsInodeInfo *cifsInfo = CIFS_I(inode);
635
636 if (cifsInfo->time == 0)
637 return 1; /* directory was changed, perhaps due to unlink */
638 else
639 return 0;
640
641 }
642
643 static int cifs_save_resume_key(const char *current_entry,
644 struct cifsFileInfo *cifsFile)
645 {
646 int rc = 0;
647 unsigned int len = 0;
648 __u16 level;
649 char *filename;
650
651 if ((cifsFile == NULL) || (current_entry == NULL))
652 return -EINVAL;
653
654 level = cifsFile->srch_inf.info_level;
655
656 if (level == SMB_FIND_FILE_UNIX) {
657 FILE_UNIX_INFO *pFindData = (FILE_UNIX_INFO *)current_entry;
658
659 filename = &pFindData->FileName[0];
660 if (cifsFile->srch_inf.unicode) {
661 len = cifs_unicode_bytelen(filename);
662 } else {
663 /* BB should we make this strnlen of PATH_MAX? */
664 len = strnlen(filename, PATH_MAX);
665 }
666 cifsFile->srch_inf.resume_key = pFindData->ResumeKey;
667 } else if (level == SMB_FIND_FILE_DIRECTORY_INFO) {
668 FILE_DIRECTORY_INFO *pFindData =
669 (FILE_DIRECTORY_INFO *)current_entry;
670 filename = &pFindData->FileName[0];
671 len = le32_to_cpu(pFindData->FileNameLength);
672 cifsFile->srch_inf.resume_key = pFindData->FileIndex;
673 } else if (level == SMB_FIND_FILE_FULL_DIRECTORY_INFO) {
674 FILE_FULL_DIRECTORY_INFO *pFindData =
675 (FILE_FULL_DIRECTORY_INFO *)current_entry;
676 filename = &pFindData->FileName[0];
677 len = le32_to_cpu(pFindData->FileNameLength);
678 cifsFile->srch_inf.resume_key = pFindData->FileIndex;
679 } else if (level == SMB_FIND_FILE_ID_FULL_DIR_INFO) {
680 SEARCH_ID_FULL_DIR_INFO *pFindData =
681 (SEARCH_ID_FULL_DIR_INFO *)current_entry;
682 filename = &pFindData->FileName[0];
683 len = le32_to_cpu(pFindData->FileNameLength);
684 cifsFile->srch_inf.resume_key = pFindData->FileIndex;
685 } else if (level == SMB_FIND_FILE_BOTH_DIRECTORY_INFO) {
686 FILE_BOTH_DIRECTORY_INFO *pFindData =
687 (FILE_BOTH_DIRECTORY_INFO *)current_entry;
688 filename = &pFindData->FileName[0];
689 len = le32_to_cpu(pFindData->FileNameLength);
690 cifsFile->srch_inf.resume_key = pFindData->FileIndex;
691 } else if (level == SMB_FIND_FILE_INFO_STANDARD) {
692 FIND_FILE_STANDARD_INFO *pFindData =
693 (FIND_FILE_STANDARD_INFO *)current_entry;
694 filename = &pFindData->FileName[0];
695 /* one byte length, no name conversion */
696 len = (unsigned int)pFindData->FileNameLength;
697 cifsFile->srch_inf.resume_key = pFindData->ResumeKey;
698 } else {
699 cFYI(1, ("Unknown findfirst level %d", level));
700 return -EINVAL;
701 }
702 cifsFile->srch_inf.resume_name_len = len;
703 cifsFile->srch_inf.presume_name = filename;
704 return rc;
705 }
706
707 /* find the corresponding entry in the search */
708 /* Note that the SMB server returns search entries for . and .. which
709 complicates logic here if we choose to parse for them and we do not
710 assume that they are located in the findfirst return buffer.*/
711 /* We start counting in the buffer with entry 2 and increment for every
712 entry (do not increment for . or .. entry) */
713 static int find_cifs_entry(const int xid, struct cifsTconInfo *pTcon,
714 struct file *file, char **ppCurrentEntry, int *num_to_ret)
715 {
716 int rc = 0;
717 int pos_in_buf = 0;
718 loff_t first_entry_in_buffer;
719 loff_t index_to_find = file->f_pos;
720 struct cifsFileInfo *cifsFile = file->private_data;
721 /* check if index in the buffer */
722
723 if ((cifsFile == NULL) || (ppCurrentEntry == NULL) ||
724 (num_to_ret == NULL))
725 return -ENOENT;
726
727 *ppCurrentEntry = NULL;
728 first_entry_in_buffer =
729 cifsFile->srch_inf.index_of_last_entry -
730 cifsFile->srch_inf.entries_in_buffer;
731
732 /* if first entry in buf is zero then is first buffer
733 in search response data which means it is likely . and ..
734 will be in this buffer, although some servers do not return
735 . and .. for the root of a drive and for those we need
736 to start two entries earlier */
737
738 dump_cifs_file_struct(file, "In fce ");
739 if (((index_to_find < cifsFile->srch_inf.index_of_last_entry) &&
740 is_dir_changed(file)) ||
741 (index_to_find < first_entry_in_buffer)) {
742 /* close and restart search */
743 cFYI(1, ("search backing up - close and restart search"));
744 write_lock(&GlobalSMBSeslock);
745 if (!cifsFile->srch_inf.endOfSearch &&
746 !cifsFile->invalidHandle) {
747 cifsFile->invalidHandle = true;
748 write_unlock(&GlobalSMBSeslock);
749 CIFSFindClose(xid, pTcon, cifsFile->netfid);
750 } else
751 write_unlock(&GlobalSMBSeslock);
752 if (cifsFile->srch_inf.ntwrk_buf_start) {
753 cFYI(1, ("freeing SMB ff cache buf on search rewind"));
754 if (cifsFile->srch_inf.smallBuf)
755 cifs_small_buf_release(cifsFile->srch_inf.
756 ntwrk_buf_start);
757 else
758 cifs_buf_release(cifsFile->srch_inf.
759 ntwrk_buf_start);
760 cifsFile->srch_inf.ntwrk_buf_start = NULL;
761 }
762 rc = initiate_cifs_search(xid, file);
763 if (rc) {
764 cFYI(1, ("error %d reinitiating a search on rewind",
765 rc));
766 return rc;
767 }
768 cifs_save_resume_key(cifsFile->srch_inf.last_entry, cifsFile);
769 }
770
771 while ((index_to_find >= cifsFile->srch_inf.index_of_last_entry) &&
772 (rc == 0) && !cifsFile->srch_inf.endOfSearch) {
773 cFYI(1, ("calling findnext2"));
774 rc = CIFSFindNext(xid, pTcon, cifsFile->netfid,
775 &cifsFile->srch_inf);
776 cifs_save_resume_key(cifsFile->srch_inf.last_entry, cifsFile);
777 if (rc)
778 return -ENOENT;
779 }
780 if (index_to_find < cifsFile->srch_inf.index_of_last_entry) {
781 /* we found the buffer that contains the entry */
782 /* scan and find it */
783 int i;
784 char *current_entry;
785 char *end_of_smb = cifsFile->srch_inf.ntwrk_buf_start +
786 smbCalcSize((struct smb_hdr *)
787 cifsFile->srch_inf.ntwrk_buf_start);
788
789 current_entry = cifsFile->srch_inf.srch_entries_start;
790 first_entry_in_buffer = cifsFile->srch_inf.index_of_last_entry
791 - cifsFile->srch_inf.entries_in_buffer;
792 pos_in_buf = index_to_find - first_entry_in_buffer;
793 cFYI(1, ("found entry - pos_in_buf %d", pos_in_buf));
794
795 for (i = 0; (i < (pos_in_buf)) && (current_entry != NULL); i++) {
796 /* go entry by entry figuring out which is first */
797 current_entry = nxt_dir_entry(current_entry, end_of_smb,
798 cifsFile->srch_inf.info_level);
799 }
800 if ((current_entry == NULL) && (i < pos_in_buf)) {
801 /* BB fixme - check if we should flag this error */
802 cERROR(1, ("reached end of buf searching for pos in buf"
803 " %d index to find %lld rc %d",
804 pos_in_buf, index_to_find, rc));
805 }
806 rc = 0;
807 *ppCurrentEntry = current_entry;
808 } else {
809 cFYI(1, ("index not in buffer - could not findnext into it"));
810 return 0;
811 }
812
813 if (pos_in_buf >= cifsFile->srch_inf.entries_in_buffer) {
814 cFYI(1, ("can not return entries pos_in_buf beyond last"));
815 *num_to_ret = 0;
816 } else
817 *num_to_ret = cifsFile->srch_inf.entries_in_buffer - pos_in_buf;
818
819 return rc;
820 }
821
822 /* inode num, inode type and filename returned */
823 static int cifs_get_name_from_search_buf(struct qstr *pqst,
824 char *current_entry, __u16 level, unsigned int unicode,
825 struct cifs_sb_info *cifs_sb, int max_len, __u64 *pinum)
826 {
827 int rc = 0;
828 unsigned int len = 0;
829 char *filename;
830 struct nls_table *nlt = cifs_sb->local_nls;
831
832 *pinum = 0;
833
834 if (level == SMB_FIND_FILE_UNIX) {
835 FILE_UNIX_INFO *pFindData = (FILE_UNIX_INFO *)current_entry;
836
837 filename = &pFindData->FileName[0];
838 if (unicode) {
839 len = cifs_unicode_bytelen(filename);
840 } else {
841 /* BB should we make this strnlen of PATH_MAX? */
842 len = strnlen(filename, PATH_MAX);
843 }
844
845 *pinum = le64_to_cpu(pFindData->UniqueId);
846 } else if (level == SMB_FIND_FILE_DIRECTORY_INFO) {
847 FILE_DIRECTORY_INFO *pFindData =
848 (FILE_DIRECTORY_INFO *)current_entry;
849 filename = &pFindData->FileName[0];
850 len = le32_to_cpu(pFindData->FileNameLength);
851 } else if (level == SMB_FIND_FILE_FULL_DIRECTORY_INFO) {
852 FILE_FULL_DIRECTORY_INFO *pFindData =
853 (FILE_FULL_DIRECTORY_INFO *)current_entry;
854 filename = &pFindData->FileName[0];
855 len = le32_to_cpu(pFindData->FileNameLength);
856 } else if (level == SMB_FIND_FILE_ID_FULL_DIR_INFO) {
857 SEARCH_ID_FULL_DIR_INFO *pFindData =
858 (SEARCH_ID_FULL_DIR_INFO *)current_entry;
859 filename = &pFindData->FileName[0];
860 len = le32_to_cpu(pFindData->FileNameLength);
861 *pinum = le64_to_cpu(pFindData->UniqueId);
862 } else if (level == SMB_FIND_FILE_BOTH_DIRECTORY_INFO) {
863 FILE_BOTH_DIRECTORY_INFO *pFindData =
864 (FILE_BOTH_DIRECTORY_INFO *)current_entry;
865 filename = &pFindData->FileName[0];
866 len = le32_to_cpu(pFindData->FileNameLength);
867 } else if (level == SMB_FIND_FILE_INFO_STANDARD) {
868 FIND_FILE_STANDARD_INFO *pFindData =
869 (FIND_FILE_STANDARD_INFO *)current_entry;
870 filename = &pFindData->FileName[0];
871 /* one byte length, no name conversion */
872 len = (unsigned int)pFindData->FileNameLength;
873 } else {
874 cFYI(1, ("Unknown findfirst level %d", level));
875 return -EINVAL;
876 }
877
878 if (len > max_len) {
879 cERROR(1, ("bad search response length %d past smb end", len));
880 return -EINVAL;
881 }
882
883 if (unicode) {
884 /* BB fixme - test with long names */
885 /* Note converted filename can be longer than in unicode */
886 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR)
887 pqst->len = cifs_convertUCSpath((char *)pqst->name,
888 (__le16 *)filename, len/2, nlt);
889 else
890 pqst->len = cifs_strfromUCS_le((char *)pqst->name,
891 (__le16 *)filename, len/2, nlt);
892 } else {
893 pqst->name = filename;
894 pqst->len = len;
895 }
896 pqst->hash = full_name_hash(pqst->name, pqst->len);
897 /* cFYI(1, ("filldir on %s",pqst->name)); */
898 return rc;
899 }
900
901 static int cifs_filldir(char *pfindEntry, struct file *file,
902 filldir_t filldir, void *direntry, char *scratch_buf, int max_len)
903 {
904 int rc = 0;
905 struct qstr qstring;
906 struct cifsFileInfo *pCifsF;
907 unsigned int obj_type;
908 __u64 inum;
909 struct cifs_sb_info *cifs_sb;
910 struct inode *tmp_inode;
911 struct dentry *tmp_dentry;
912
913 /* get filename and len into qstring */
914 /* get dentry */
915 /* decide whether to create and populate ionde */
916 if ((direntry == NULL) || (file == NULL))
917 return -EINVAL;
918
919 pCifsF = file->private_data;
920
921 if ((scratch_buf == NULL) || (pfindEntry == NULL) || (pCifsF == NULL))
922 return -ENOENT;
923
924 rc = cifs_entry_is_dot(pfindEntry, pCifsF);
925 /* skip . and .. since we added them first */
926 if (rc != 0)
927 return 0;
928
929 cifs_sb = CIFS_SB(file->f_path.dentry->d_sb);
930
931 qstring.name = scratch_buf;
932 rc = cifs_get_name_from_search_buf(&qstring, pfindEntry,
933 pCifsF->srch_inf.info_level,
934 pCifsF->srch_inf.unicode, cifs_sb,
935 max_len,
936 &inum /* returned */);
937
938 if (rc)
939 return rc;
940
941 /* only these two infolevels return valid inode numbers */
942 if (pCifsF->srch_inf.info_level == SMB_FIND_FILE_UNIX ||
943 pCifsF->srch_inf.info_level == SMB_FIND_FILE_ID_FULL_DIR_INFO)
944 rc = construct_dentry(&qstring, file, &tmp_inode, &tmp_dentry,
945 &inum);
946 else
947 rc = construct_dentry(&qstring, file, &tmp_inode, &tmp_dentry,
948 NULL);
949
950 if ((tmp_inode == NULL) || (tmp_dentry == NULL))
951 return -ENOMEM;
952
953 /* we pass in rc below, indicating whether it is a new inode,
954 so we can figure out whether to invalidate the inode cached
955 data if the file has changed */
956 if (pCifsF->srch_inf.info_level == SMB_FIND_FILE_UNIX)
957 unix_fill_in_inode(tmp_inode,
958 (FILE_UNIX_INFO *)pfindEntry,
959 &obj_type, rc);
960 else if (pCifsF->srch_inf.info_level == SMB_FIND_FILE_INFO_STANDARD)
961 fill_in_inode(tmp_inode, 0 /* old level 1 buffer type */,
962 pfindEntry, &obj_type, rc);
963 else
964 fill_in_inode(tmp_inode, 1 /* NT */, pfindEntry, &obj_type, rc);
965
966 if (rc) /* new inode - needs to be tied to dentry */ {
967 d_instantiate(tmp_dentry, tmp_inode);
968 if (rc == 2)
969 d_rehash(tmp_dentry);
970 }
971
972
973 rc = filldir(direntry, qstring.name, qstring.len, file->f_pos,
974 tmp_inode->i_ino, obj_type);
975 if (rc) {
976 cFYI(1, ("filldir rc = %d", rc));
977 /* we can not return filldir errors to the caller
978 since they are "normal" when the stat blocksize
979 is too small - we return remapped error instead */
980 rc = -EOVERFLOW;
981 }
982
983 dput(tmp_dentry);
984 return rc;
985 }
986
987
988 int cifs_readdir(struct file *file, void *direntry, filldir_t filldir)
989 {
990 int rc = 0;
991 int xid, i;
992 struct cifs_sb_info *cifs_sb;
993 struct cifsTconInfo *pTcon;
994 struct cifsFileInfo *cifsFile = NULL;
995 char *current_entry;
996 int num_to_fill = 0;
997 char *tmp_buf = NULL;
998 char *end_of_smb;
999 int max_len;
1000
1001 xid = GetXid();
1002
1003 cifs_sb = CIFS_SB(file->f_path.dentry->d_sb);
1004 pTcon = cifs_sb->tcon;
1005 if (pTcon == NULL)
1006 return -EINVAL;
1007
1008 switch ((int) file->f_pos) {
1009 case 0:
1010 if (filldir(direntry, ".", 1, file->f_pos,
1011 file->f_path.dentry->d_inode->i_ino, DT_DIR) < 0) {
1012 cERROR(1, ("Filldir for current dir failed"));
1013 rc = -ENOMEM;
1014 break;
1015 }
1016 file->f_pos++;
1017 case 1:
1018 if (filldir(direntry, "..", 2, file->f_pos,
1019 file->f_path.dentry->d_parent->d_inode->i_ino, DT_DIR) < 0) {
1020 cERROR(1, ("Filldir for parent dir failed"));
1021 rc = -ENOMEM;
1022 break;
1023 }
1024 file->f_pos++;
1025 default:
1026 /* 1) If search is active,
1027 is in current search buffer?
1028 if it before then restart search
1029 if after then keep searching till find it */
1030
1031 if (file->private_data == NULL) {
1032 rc = initiate_cifs_search(xid, file);
1033 cFYI(1, ("initiate cifs search rc %d", rc));
1034 if (rc) {
1035 FreeXid(xid);
1036 return rc;
1037 }
1038 }
1039 if (file->private_data == NULL) {
1040 rc = -EINVAL;
1041 FreeXid(xid);
1042 return rc;
1043 }
1044 cifsFile = file->private_data;
1045 if (cifsFile->srch_inf.endOfSearch) {
1046 if (cifsFile->srch_inf.emptyDir) {
1047 cFYI(1, ("End of search, empty dir"));
1048 rc = 0;
1049 break;
1050 }
1051 } /* else {
1052 cifsFile->invalidHandle = true;
1053 CIFSFindClose(xid, pTcon, cifsFile->netfid);
1054 } */
1055
1056 rc = find_cifs_entry(xid, pTcon, file,
1057 &current_entry, &num_to_fill);
1058 if (rc) {
1059 cFYI(1, ("fce error %d", rc));
1060 goto rddir2_exit;
1061 } else if (current_entry != NULL) {
1062 cFYI(1, ("entry %lld found", file->f_pos));
1063 } else {
1064 cFYI(1, ("could not find entry"));
1065 goto rddir2_exit;
1066 }
1067 cFYI(1, ("loop through %d times filling dir for net buf %p",
1068 num_to_fill, cifsFile->srch_inf.ntwrk_buf_start));
1069 max_len = smbCalcSize((struct smb_hdr *)
1070 cifsFile->srch_inf.ntwrk_buf_start);
1071 end_of_smb = cifsFile->srch_inf.ntwrk_buf_start + max_len;
1072
1073 /* To be safe - for UCS to UTF-8 with strings loaded
1074 with the rare long characters alloc more to account for
1075 such multibyte target UTF-8 characters. cifs_unicode.c,
1076 which actually does the conversion, has the same limit */
1077 tmp_buf = kmalloc((2 * NAME_MAX) + 4, GFP_KERNEL);
1078 for (i = 0; (i < num_to_fill) && (rc == 0); i++) {
1079 if (current_entry == NULL) {
1080 /* evaluate whether this case is an error */
1081 cERROR(1, ("past SMB end, num to fill %d i %d",
1082 num_to_fill, i));
1083 break;
1084 }
1085 /* if buggy server returns . and .. late do
1086 we want to check for that here? */
1087 rc = cifs_filldir(current_entry, file,
1088 filldir, direntry, tmp_buf, max_len);
1089 if (rc == -EOVERFLOW) {
1090 rc = 0;
1091 break;
1092 }
1093
1094 file->f_pos++;
1095 if (file->f_pos ==
1096 cifsFile->srch_inf.index_of_last_entry) {
1097 cFYI(1, ("last entry in buf at pos %lld %s",
1098 file->f_pos, tmp_buf));
1099 cifs_save_resume_key(current_entry, cifsFile);
1100 break;
1101 } else
1102 current_entry =
1103 nxt_dir_entry(current_entry, end_of_smb,
1104 cifsFile->srch_inf.info_level);
1105 }
1106 kfree(tmp_buf);
1107 break;
1108 } /* end switch */
1109
1110 rddir2_exit:
1111 FreeXid(xid);
1112 return rc;
1113 }
Linux 2.6 ibm-acpi/thinkpad-acpi driver git tree