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sched: move the __update_rq_clock() call to scheduler_tick()
[usb.git] / fs / cifs / readdir.c
blob916df9431336734b8cab6495659ef4d345133498
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, int *pobject_type, int isNewInode)
125 {
126 loff_t local_size;
127 struct timespec local_mtime;
128
129 struct cifsInodeInfo *cifsInfo = CIFS_I(tmp_inode);
130 struct cifs_sb_info *cifs_sb = CIFS_SB(tmp_inode->i_sb);
131 __u32 attr;
132 __u64 allocation_size;
133 __u64 end_of_file;
134
135 /* save mtime and size */
136 local_mtime = tmp_inode->i_mtime;
137 local_size = tmp_inode->i_size;
138
139 if (new_buf_type) {
140 FILE_DIRECTORY_INFO *pfindData = (FILE_DIRECTORY_INFO *)buf;
141
142 attr = le32_to_cpu(pfindData->ExtFileAttributes);
143 allocation_size = le64_to_cpu(pfindData->AllocationSize);
144 end_of_file = le64_to_cpu(pfindData->EndOfFile);
145 tmp_inode->i_atime =
146 cifs_NTtimeToUnix(le64_to_cpu(pfindData->LastAccessTime));
147 tmp_inode->i_mtime =
148 cifs_NTtimeToUnix(le64_to_cpu(pfindData->LastWriteTime));
149 tmp_inode->i_ctime =
150 cifs_NTtimeToUnix(le64_to_cpu(pfindData->ChangeTime));
151 } else { /* legacy, OS2 and DOS style */
152 /* struct timespec ts;*/
153 FIND_FILE_STANDARD_INFO * pfindData =
154 (FIND_FILE_STANDARD_INFO *)buf;
155
156 tmp_inode->i_mtime = cnvrtDosUnixTm(
157 le16_to_cpu(pfindData->LastWriteDate),
158 le16_to_cpu(pfindData->LastWriteTime));
159 tmp_inode->i_atime = cnvrtDosUnixTm(
160 le16_to_cpu(pfindData->LastAccessDate),
161 le16_to_cpu(pfindData->LastAccessTime));
162 tmp_inode->i_ctime = cnvrtDosUnixTm(
163 le16_to_cpu(pfindData->LastWriteDate),
164 le16_to_cpu(pfindData->LastWriteTime));
165 AdjustForTZ(cifs_sb->tcon, tmp_inode);
166 attr = le16_to_cpu(pfindData->Attributes);
167 allocation_size = le32_to_cpu(pfindData->AllocationSize);
168 end_of_file = le32_to_cpu(pfindData->DataSize);
169 }
170
171 /* Linux can not store file creation time unfortunately so ignore it */
172
173 cifsInfo->cifsAttrs = attr;
174 cifsInfo->time = jiffies;
175
176 /* treat dos attribute of read-only as read-only mode bit e.g. 555? */
177 /* 2767 perms - indicate mandatory locking */
178 /* BB fill in uid and gid here? with help from winbind?
179 or retrieve from NTFS stream extended attribute */
180 if (atomic_read(&cifsInfo->inUse) == 0) {
181 tmp_inode->i_uid = cifs_sb->mnt_uid;
182 tmp_inode->i_gid = cifs_sb->mnt_gid;
183 /* set default mode. will override for dirs below */
184 tmp_inode->i_mode = cifs_sb->mnt_file_mode;
185 } else {
186 /* mask off the type bits since it gets set
187 below and we do not want to get two type
188 bits set */
189 tmp_inode->i_mode &= ~S_IFMT;
190 }
191
192 if (attr & ATTR_DIRECTORY) {
193 *pobject_type = DT_DIR;
194 /* override default perms since we do not lock dirs */
195 if (atomic_read(&cifsInfo->inUse) == 0) {
196 tmp_inode->i_mode = cifs_sb->mnt_dir_mode;
197 }
198 tmp_inode->i_mode |= S_IFDIR;
199 } else if ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_UNX_EMUL) &&
200 (attr & ATTR_SYSTEM)) {
201 if (end_of_file == 0) {
202 *pobject_type = DT_FIFO;
203 tmp_inode->i_mode |= S_IFIFO;
204 } else {
205 /* rather than get the type here, we mark the
206 inode as needing revalidate and get the real type
207 (blk vs chr vs. symlink) later ie in lookup */
208 *pobject_type = DT_REG;
209 tmp_inode->i_mode |= S_IFREG;
210 cifsInfo->time = 0;
211 }
212 /* we no longer mark these because we could not follow them */
213 /* } else if (attr & ATTR_REPARSE) {
214 *pobject_type = DT_LNK;
215 tmp_inode->i_mode |= S_IFLNK; */
216 } else {
217 *pobject_type = DT_REG;
218 tmp_inode->i_mode |= S_IFREG;
219 if (attr & ATTR_READONLY)
220 tmp_inode->i_mode &= ~(S_IWUGO);
221 else if ((tmp_inode->i_mode & S_IWUGO) == 0)
222 /* the ATTR_READONLY flag may have been changed on */
223 /* server -- set any w bits allowed by mnt_file_mode */
224 tmp_inode->i_mode |= (S_IWUGO & cifs_sb->mnt_file_mode);
225 } /* could add code here - to validate if device or weird share type? */
226
227 /* can not fill in nlink here as in qpathinfo version and Unx search */
228 if (atomic_read(&cifsInfo->inUse) == 0) {
229 atomic_set(&cifsInfo->inUse, 1);
230 }
231
232 spin_lock(&tmp_inode->i_lock);
233 if (is_size_safe_to_change(cifsInfo, end_of_file)) {
234 /* can not safely change the file size here if the
235 client is writing to it due to potential races */
236 i_size_write(tmp_inode, end_of_file);
237
238 /* 512 bytes (2**9) is the fake blocksize that must be used */
239 /* for this calculation, even though the reported blocksize is larger */
240 tmp_inode->i_blocks = (512 - 1 + allocation_size) >> 9;
241 }
242 spin_unlock(&tmp_inode->i_lock);
243
244 if (allocation_size < end_of_file)
245 cFYI(1, ("May be sparse file, allocation less than file size"));
246 cFYI(1, ("File Size %ld and blocks %llu",
247 (unsigned long)tmp_inode->i_size,
248 (unsigned long long)tmp_inode->i_blocks));
249 if (S_ISREG(tmp_inode->i_mode)) {
250 cFYI(1, ("File inode"));
251 tmp_inode->i_op = &cifs_file_inode_ops;
252 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DIRECT_IO) {
253 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_BRL)
254 tmp_inode->i_fop = &cifs_file_direct_nobrl_ops;
255 else
256 tmp_inode->i_fop = &cifs_file_direct_ops;
257 } else if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_BRL)
258 tmp_inode->i_fop = &cifs_file_nobrl_ops;
259 else
260 tmp_inode->i_fop = &cifs_file_ops;
261
262 if ((cifs_sb->tcon) && (cifs_sb->tcon->ses) &&
263 (cifs_sb->tcon->ses->server->maxBuf <
264 PAGE_CACHE_SIZE + MAX_CIFS_HDR_SIZE))
265 tmp_inode->i_data.a_ops = &cifs_addr_ops_smallbuf;
266 else
267 tmp_inode->i_data.a_ops = &cifs_addr_ops;
268
269 if (isNewInode)
270 return; /* No sense invalidating pages for new inode
271 since have not started caching readahead file
272 data yet */
273
274 if (timespec_equal(&tmp_inode->i_mtime, &local_mtime) &&
275 (local_size == tmp_inode->i_size)) {
276 cFYI(1, ("inode exists but unchanged"));
277 } else {
278 /* file may have changed on server */
279 cFYI(1, ("invalidate inode, readdir detected change"));
280 invalidate_remote_inode(tmp_inode);
281 }
282 } else if (S_ISDIR(tmp_inode->i_mode)) {
283 cFYI(1, ("Directory inode"));
284 tmp_inode->i_op = &cifs_dir_inode_ops;
285 tmp_inode->i_fop = &cifs_dir_ops;
286 } else if (S_ISLNK(tmp_inode->i_mode)) {
287 cFYI(1, ("Symbolic Link inode"));
288 tmp_inode->i_op = &cifs_symlink_inode_ops;
289 } else {
290 cFYI(1, ("Init special inode"));
291 init_special_inode(tmp_inode, tmp_inode->i_mode,
292 tmp_inode->i_rdev);
293 }
294 }
295
296 static void unix_fill_in_inode(struct inode *tmp_inode,
297 FILE_UNIX_INFO *pfindData, int *pobject_type, int isNewInode)
298 {
299 loff_t local_size;
300 struct timespec local_mtime;
301
302 struct cifsInodeInfo *cifsInfo = CIFS_I(tmp_inode);
303 struct cifs_sb_info *cifs_sb = CIFS_SB(tmp_inode->i_sb);
304
305 __u32 type = le32_to_cpu(pfindData->Type);
306 __u64 num_of_bytes = le64_to_cpu(pfindData->NumOfBytes);
307 __u64 end_of_file = le64_to_cpu(pfindData->EndOfFile);
308 cifsInfo->time = jiffies;
309 atomic_inc(&cifsInfo->inUse);
310
311 /* save mtime and size */
312 local_mtime = tmp_inode->i_mtime;
313 local_size = tmp_inode->i_size;
314
315 tmp_inode->i_atime =
316 cifs_NTtimeToUnix(le64_to_cpu(pfindData->LastAccessTime));
317 tmp_inode->i_mtime =
318 cifs_NTtimeToUnix(le64_to_cpu(pfindData->LastModificationTime));
319 tmp_inode->i_ctime =
320 cifs_NTtimeToUnix(le64_to_cpu(pfindData->LastStatusChange));
321
322 tmp_inode->i_mode = le64_to_cpu(pfindData->Permissions);
323 /* since we set the inode type below we need to mask off type
324 to avoid strange results if bits above were corrupt */
325 tmp_inode->i_mode &= ~S_IFMT;
326 if (type == UNIX_FILE) {
327 *pobject_type = DT_REG;
328 tmp_inode->i_mode |= S_IFREG;
329 } else if (type == UNIX_SYMLINK) {
330 *pobject_type = DT_LNK;
331 tmp_inode->i_mode |= S_IFLNK;
332 } else if (type == UNIX_DIR) {
333 *pobject_type = DT_DIR;
334 tmp_inode->i_mode |= S_IFDIR;
335 } else if (type == UNIX_CHARDEV) {
336 *pobject_type = DT_CHR;
337 tmp_inode->i_mode |= S_IFCHR;
338 tmp_inode->i_rdev = MKDEV(le64_to_cpu(pfindData->DevMajor),
339 le64_to_cpu(pfindData->DevMinor) & MINORMASK);
340 } else if (type == UNIX_BLOCKDEV) {
341 *pobject_type = DT_BLK;
342 tmp_inode->i_mode |= S_IFBLK;
343 tmp_inode->i_rdev = MKDEV(le64_to_cpu(pfindData->DevMajor),
344 le64_to_cpu(pfindData->DevMinor) & MINORMASK);
345 } else if (type == UNIX_FIFO) {
346 *pobject_type = DT_FIFO;
347 tmp_inode->i_mode |= S_IFIFO;
348 } else if (type == UNIX_SOCKET) {
349 *pobject_type = DT_SOCK;
350 tmp_inode->i_mode |= S_IFSOCK;
351 } else {
352 /* safest to just call it a file */
353 *pobject_type = DT_REG;
354 tmp_inode->i_mode |= S_IFREG;
355 cFYI(1, ("unknown inode type %d", type));
356 }
357
358 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_OVERR_UID)
359 tmp_inode->i_uid = cifs_sb->mnt_uid;
360 else
361 tmp_inode->i_uid = le64_to_cpu(pfindData->Uid);
362 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_OVERR_GID)
363 tmp_inode->i_gid = cifs_sb->mnt_gid;
364 else
365 tmp_inode->i_gid = le64_to_cpu(pfindData->Gid);
366 tmp_inode->i_nlink = le64_to_cpu(pfindData->Nlinks);
367
368 spin_lock(&tmp_inode->i_lock);
369 if (is_size_safe_to_change(cifsInfo, end_of_file)) {
370 /* can not safely change the file size here if the
371 client is writing to it due to potential races */
372 i_size_write(tmp_inode, end_of_file);
373
374 /* 512 bytes (2**9) is the fake blocksize that must be used */
375 /* for this calculation, not the real blocksize */
376 tmp_inode->i_blocks = (512 - 1 + num_of_bytes) >> 9;
377 }
378 spin_unlock(&tmp_inode->i_lock);
379
380 if (S_ISREG(tmp_inode->i_mode)) {
381 cFYI(1, ("File inode"));
382 tmp_inode->i_op = &cifs_file_inode_ops;
383
384 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DIRECT_IO) {
385 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_BRL)
386 tmp_inode->i_fop = &cifs_file_direct_nobrl_ops;
387 else
388 tmp_inode->i_fop = &cifs_file_direct_ops;
389 } else if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_BRL)
390 tmp_inode->i_fop = &cifs_file_nobrl_ops;
391 else
392 tmp_inode->i_fop = &cifs_file_ops;
393
394 if ((cifs_sb->tcon) && (cifs_sb->tcon->ses) &&
395 (cifs_sb->tcon->ses->server->maxBuf <
396 PAGE_CACHE_SIZE + MAX_CIFS_HDR_SIZE))
397 tmp_inode->i_data.a_ops = &cifs_addr_ops_smallbuf;
398 else
399 tmp_inode->i_data.a_ops = &cifs_addr_ops;
400
401 if (isNewInode)
402 return; /* No sense invalidating pages for new inode
403 since we have not started caching readahead
404 file data for it yet */
405
406 if (timespec_equal(&tmp_inode->i_mtime, &local_mtime) &&
407 (local_size == tmp_inode->i_size)) {
408 cFYI(1, ("inode exists but unchanged"));
409 } else {
410 /* file may have changed on server */
411 cFYI(1, ("invalidate inode, readdir detected change"));
412 invalidate_remote_inode(tmp_inode);
413 }
414 } else if (S_ISDIR(tmp_inode->i_mode)) {
415 cFYI(1, ("Directory inode"));
416 tmp_inode->i_op = &cifs_dir_inode_ops;
417 tmp_inode->i_fop = &cifs_dir_ops;
418 } else if (S_ISLNK(tmp_inode->i_mode)) {
419 cFYI(1, ("Symbolic Link inode"));
420 tmp_inode->i_op = &cifs_symlink_inode_ops;
421 /* tmp_inode->i_fop = *//* do not need to set to anything */
422 } else {
423 cFYI(1, ("Special inode"));
424 init_special_inode(tmp_inode, tmp_inode->i_mode,
425 tmp_inode->i_rdev);
426 }
427 }
428
429 static int initiate_cifs_search(const int xid, struct file *file)
430 {
431 int rc = 0;
432 char *full_path;
433 struct cifsFileInfo *cifsFile;
434 struct cifs_sb_info *cifs_sb;
435 struct cifsTconInfo *pTcon;
436
437 if (file->private_data == NULL) {
438 file->private_data =
439 kzalloc(sizeof(struct cifsFileInfo), GFP_KERNEL);
440 }
441
442 if (file->private_data == NULL)
443 return -ENOMEM;
444 cifsFile = file->private_data;
445 cifsFile->invalidHandle = TRUE;
446 cifsFile->srch_inf.endOfSearch = FALSE;
447
448 cifs_sb = CIFS_SB(file->f_path.dentry->d_sb);
449 if (cifs_sb == NULL)
450 return -EINVAL;
451
452 pTcon = cifs_sb->tcon;
453 if (pTcon == NULL)
454 return -EINVAL;
455
456 full_path = build_path_from_dentry(file->f_path.dentry);
457
458 if (full_path == NULL) {
459 return -ENOMEM;
460 }
461
462 cFYI(1, ("Full path: %s start at: %lld", full_path, file->f_pos));
463
464 ffirst_retry:
465 /* test for Unix extensions */
466 /* but now check for them on the share/mount not on the SMB session */
467 /* if (pTcon->ses->capabilities & CAP_UNIX) { */
468 if (pTcon->unix_ext) {
469 cifsFile->srch_inf.info_level = SMB_FIND_FILE_UNIX;
470 } else if ((pTcon->ses->capabilities &
471 (CAP_NT_SMBS | CAP_NT_FIND)) == 0) {
472 cifsFile->srch_inf.info_level = SMB_FIND_FILE_INFO_STANDARD;
473 } else if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM) {
474 cifsFile->srch_inf.info_level = SMB_FIND_FILE_ID_FULL_DIR_INFO;
475 } else /* not srvinos - BB fixme add check for backlevel? */ {
476 cifsFile->srch_inf.info_level = SMB_FIND_FILE_DIRECTORY_INFO;
477 }
478
479 rc = CIFSFindFirst(xid, pTcon, full_path, cifs_sb->local_nls,
480 &cifsFile->netfid, &cifsFile->srch_inf,
481 cifs_sb->mnt_cifs_flags &
482 CIFS_MOUNT_MAP_SPECIAL_CHR, CIFS_DIR_SEP(cifs_sb));
483 if (rc == 0)
484 cifsFile->invalidHandle = FALSE;
485 if ((rc == -EOPNOTSUPP) &&
486 (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM)) {
487 cifs_sb->mnt_cifs_flags &= ~CIFS_MOUNT_SERVER_INUM;
488 goto ffirst_retry;
489 }
490 kfree(full_path);
491 return rc;
492 }
493
494 /* return length of unicode string in bytes */
495 static int cifs_unicode_bytelen(char *str)
496 {
497 int len;
498 __le16 * ustr = (__le16 *)str;
499
500 for (len = 0; len <= PATH_MAX; len++) {
501 if (ustr[len] == 0)
502 return len << 1;
503 }
504 cFYI(1, ("Unicode string longer than PATH_MAX found"));
505 return len << 1;
506 }
507
508 static char *nxt_dir_entry(char *old_entry, char *end_of_smb, int level)
509 {
510 char *new_entry;
511 FILE_DIRECTORY_INFO * pDirInfo = (FILE_DIRECTORY_INFO *)old_entry;
512
513 if (level == SMB_FIND_FILE_INFO_STANDARD) {
514 FIND_FILE_STANDARD_INFO * pfData;
515 pfData = (FIND_FILE_STANDARD_INFO *)pDirInfo;
516
517 new_entry = old_entry + sizeof(FIND_FILE_STANDARD_INFO) +
518 pfData->FileNameLength;
519 } else
520 new_entry = old_entry + le32_to_cpu(pDirInfo->NextEntryOffset);
521 cFYI(1, ("new entry %p old entry %p", new_entry, old_entry));
522 /* validate that new_entry is not past end of SMB */
523 if (new_entry >= end_of_smb) {
524 cERROR(1,
525 ("search entry %p began after end of SMB %p old entry %p",
526 new_entry, end_of_smb, old_entry));
527 return NULL;
528 } else if (((level == SMB_FIND_FILE_INFO_STANDARD) &&
529 (new_entry + sizeof(FIND_FILE_STANDARD_INFO) > end_of_smb))
530 || ((level != SMB_FIND_FILE_INFO_STANDARD) &&
531 (new_entry + sizeof(FILE_DIRECTORY_INFO) > end_of_smb))) {
532 cERROR(1, ("search entry %p extends after end of SMB %p",
533 new_entry, end_of_smb));
534 return NULL;
535 } else
536 return new_entry;
537
538 }
539
540 #define UNICODE_DOT cpu_to_le16(0x2e)
541
542 /* return 0 if no match and 1 for . (current directory) and 2 for .. (parent) */
543 static int cifs_entry_is_dot(char *current_entry, struct cifsFileInfo *cfile)
544 {
545 int rc = 0;
546 char *filename = NULL;
547 int len = 0;
548
549 if (cfile->srch_inf.info_level == SMB_FIND_FILE_UNIX) {
550 FILE_UNIX_INFO * pFindData = (FILE_UNIX_INFO *)current_entry;
551 filename = &pFindData->FileName[0];
552 if (cfile->srch_inf.unicode) {
553 len = cifs_unicode_bytelen(filename);
554 } else {
555 /* BB should we make this strnlen of PATH_MAX? */
556 len = strnlen(filename, 5);
557 }
558 } else if (cfile->srch_inf.info_level == SMB_FIND_FILE_DIRECTORY_INFO) {
559 FILE_DIRECTORY_INFO * pFindData =
560 (FILE_DIRECTORY_INFO *)current_entry;
561 filename = &pFindData->FileName[0];
562 len = le32_to_cpu(pFindData->FileNameLength);
563 } else if (cfile->srch_inf.info_level ==
564 SMB_FIND_FILE_FULL_DIRECTORY_INFO) {
565 FILE_FULL_DIRECTORY_INFO * pFindData =
566 (FILE_FULL_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_ID_FULL_DIR_INFO) {
571 SEARCH_ID_FULL_DIR_INFO * pFindData =
572 (SEARCH_ID_FULL_DIR_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_BOTH_DIRECTORY_INFO) {
577 FILE_BOTH_DIRECTORY_INFO * pFindData =
578 (FILE_BOTH_DIRECTORY_INFO *)current_entry;
579 filename = &pFindData->FileName[0];
580 len = le32_to_cpu(pFindData->FileNameLength);
581 } else if (cfile->srch_inf.info_level == SMB_FIND_FILE_INFO_STANDARD) {
582 FIND_FILE_STANDARD_INFO * pFindData =
583 (FIND_FILE_STANDARD_INFO *)current_entry;
584 filename = &pFindData->FileName[0];
585 len = pFindData->FileNameLength;
586 } else {
587 cFYI(1, ("Unknown findfirst level %d",
588 cfile->srch_inf.info_level));
589 }
590
591 if (filename) {
592 if (cfile->srch_inf.unicode) {
593 __le16 *ufilename = (__le16 *)filename;
594 if (len == 2) {
595 /* check for . */
596 if (ufilename[0] == UNICODE_DOT)
597 rc = 1;
598 } else if (len == 4) {
599 /* check for .. */
600 if ((ufilename[0] == UNICODE_DOT)
601 && (ufilename[1] == UNICODE_DOT))
602 rc = 2;
603 }
604 } else /* ASCII */ {
605 if (len == 1) {
606 if (filename[0] == '.')
607 rc = 1;
608 } else if (len == 2) {
609 if ((filename[0] == '.') && (filename[1] == '.'))
610 rc = 2;
611 }
612 }
613 }
614
615 return rc;
616 }
617
618 /* Check if directory that we are searching has changed so we can decide
619 whether we can use the cached search results from the previous search */
620 static int is_dir_changed(struct file *file)
621 {
622 struct inode *inode = file->f_path.dentry->d_inode;
623 struct cifsInodeInfo *cifsInfo = CIFS_I(inode);
624
625 if (cifsInfo->time == 0)
626 return 1; /* directory was changed, perhaps due to unlink */
627 else
628 return 0;
629
630 }
631
632 /* find the corresponding entry in the search */
633 /* Note that the SMB server returns search entries for . and .. which
634 complicates logic here if we choose to parse for them and we do not
635 assume that they are located in the findfirst return buffer.*/
636 /* We start counting in the buffer with entry 2 and increment for every
637 entry (do not increment for . or .. entry) */
638 static int find_cifs_entry(const int xid, struct cifsTconInfo *pTcon,
639 struct file *file, char **ppCurrentEntry, int *num_to_ret)
640 {
641 int rc = 0;
642 int pos_in_buf = 0;
643 loff_t first_entry_in_buffer;
644 loff_t index_to_find = file->f_pos;
645 struct cifsFileInfo *cifsFile = file->private_data;
646 /* check if index in the buffer */
647
648 if ((cifsFile == NULL) || (ppCurrentEntry == NULL) ||
649 (num_to_ret == NULL))
650 return -ENOENT;
651
652 *ppCurrentEntry = NULL;
653 first_entry_in_buffer =
654 cifsFile->srch_inf.index_of_last_entry -
655 cifsFile->srch_inf.entries_in_buffer;
656
657 /* if first entry in buf is zero then is first buffer
658 in search response data which means it is likely . and ..
659 will be in this buffer, although some servers do not return
660 . and .. for the root of a drive and for those we need
661 to start two entries earlier */
662
663 #ifdef CONFIG_CIFS_DEBUG2
664 dump_cifs_file_struct(file, "In fce ");
665 #endif
666 if (((index_to_find < cifsFile->srch_inf.index_of_last_entry) &&
667 is_dir_changed(file)) ||
668 (index_to_find < first_entry_in_buffer)) {
669 /* close and restart search */
670 cFYI(1, ("search backing up - close and restart search"));
671 cifsFile->invalidHandle = TRUE;
672 CIFSFindClose(xid, pTcon, cifsFile->netfid);
673 kfree(cifsFile->search_resume_name);
674 cifsFile->search_resume_name = NULL;
675 if (cifsFile->srch_inf.ntwrk_buf_start) {
676 cFYI(1, ("freeing SMB ff cache buf on search rewind"));
677 if (cifsFile->srch_inf.smallBuf)
678 cifs_small_buf_release(cifsFile->srch_inf.
679 ntwrk_buf_start);
680 else
681 cifs_buf_release(cifsFile->srch_inf.
682 ntwrk_buf_start);
683 }
684 rc = initiate_cifs_search(xid, file);
685 if (rc) {
686 cFYI(1, ("error %d reinitiating a search on rewind",
687 rc));
688 return rc;
689 }
690 }
691
692 while ((index_to_find >= cifsFile->srch_inf.index_of_last_entry) &&
693 (rc == 0) && (cifsFile->srch_inf.endOfSearch == FALSE)) {
694 cFYI(1, ("calling findnext2"));
695 rc = CIFSFindNext(xid, pTcon, cifsFile->netfid,
696 &cifsFile->srch_inf);
697 if (rc)
698 return -ENOENT;
699 }
700 if (index_to_find < cifsFile->srch_inf.index_of_last_entry) {
701 /* we found the buffer that contains the entry */
702 /* scan and find it */
703 int i;
704 char *current_entry;
705 char *end_of_smb = cifsFile->srch_inf.ntwrk_buf_start +
706 smbCalcSize((struct smb_hdr *)
707 cifsFile->srch_inf.ntwrk_buf_start);
708
709 current_entry = cifsFile->srch_inf.srch_entries_start;
710 first_entry_in_buffer = cifsFile->srch_inf.index_of_last_entry
711 - cifsFile->srch_inf.entries_in_buffer;
712 pos_in_buf = index_to_find - first_entry_in_buffer;
713 cFYI(1, ("found entry - pos_in_buf %d", pos_in_buf));
714
715 for (i=0; (i < (pos_in_buf)) && (current_entry != NULL); i++) {
716 /* go entry by entry figuring out which is first */
717 current_entry = nxt_dir_entry(current_entry, end_of_smb,
718 cifsFile->srch_inf.info_level);
719 }
720 if ((current_entry == NULL) && (i < pos_in_buf)) {
721 /* BB fixme - check if we should flag this error */
722 cERROR(1, ("reached end of buf searching for pos in buf"
723 " %d index to find %lld rc %d",
724 pos_in_buf, index_to_find, rc));
725 }
726 rc = 0;
727 *ppCurrentEntry = current_entry;
728 } else {
729 cFYI(1, ("index not in buffer - could not findnext into it"));
730 return 0;
731 }
732
733 if (pos_in_buf >= cifsFile->srch_inf.entries_in_buffer) {
734 cFYI(1, ("can not return entries pos_in_buf beyond last"));
735 *num_to_ret = 0;
736 } else
737 *num_to_ret = cifsFile->srch_inf.entries_in_buffer - pos_in_buf;
738
739 return rc;
740 }
741
742 /* inode num, inode type and filename returned */
743 static int cifs_get_name_from_search_buf(struct qstr *pqst,
744 char *current_entry, __u16 level, unsigned int unicode,
745 struct cifs_sb_info *cifs_sb, int max_len, ino_t *pinum)
746 {
747 int rc = 0;
748 unsigned int len = 0;
749 char *filename;
750 struct nls_table *nlt = cifs_sb->local_nls;
751
752 *pinum = 0;
753
754 if (level == SMB_FIND_FILE_UNIX) {
755 FILE_UNIX_INFO *pFindData = (FILE_UNIX_INFO *)current_entry;
756
757 filename = &pFindData->FileName[0];
758 if (unicode) {
759 len = cifs_unicode_bytelen(filename);
760 } else {
761 /* BB should we make this strnlen of PATH_MAX? */
762 len = strnlen(filename, PATH_MAX);
763 }
764
765 /* BB fixme - hash low and high 32 bits if not 64 bit arch BB */
766 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM)
767 *pinum = pFindData->UniqueId;
768 } else if (level == SMB_FIND_FILE_DIRECTORY_INFO) {
769 FILE_DIRECTORY_INFO *pFindData =
770 (FILE_DIRECTORY_INFO *)current_entry;
771 filename = &pFindData->FileName[0];
772 len = le32_to_cpu(pFindData->FileNameLength);
773 } else if (level == SMB_FIND_FILE_FULL_DIRECTORY_INFO) {
774 FILE_FULL_DIRECTORY_INFO *pFindData =
775 (FILE_FULL_DIRECTORY_INFO *)current_entry;
776 filename = &pFindData->FileName[0];
777 len = le32_to_cpu(pFindData->FileNameLength);
778 } else if (level == SMB_FIND_FILE_ID_FULL_DIR_INFO) {
779 SEARCH_ID_FULL_DIR_INFO *pFindData =
780 (SEARCH_ID_FULL_DIR_INFO *)current_entry;
781 filename = &pFindData->FileName[0];
782 len = le32_to_cpu(pFindData->FileNameLength);
783 *pinum = pFindData->UniqueId;
784 } else if (level == SMB_FIND_FILE_BOTH_DIRECTORY_INFO) {
785 FILE_BOTH_DIRECTORY_INFO *pFindData =
786 (FILE_BOTH_DIRECTORY_INFO *)current_entry;
787 filename = &pFindData->FileName[0];
788 len = le32_to_cpu(pFindData->FileNameLength);
789 } else if (level == SMB_FIND_FILE_INFO_STANDARD) {
790 FIND_FILE_STANDARD_INFO * pFindData =
791 (FIND_FILE_STANDARD_INFO *)current_entry;
792 filename = &pFindData->FileName[0];
793 /* one byte length, no name conversion */
794 len = (unsigned int)pFindData->FileNameLength;
795 } else {
796 cFYI(1, ("Unknown findfirst level %d", level));
797 return -EINVAL;
798 }
799
800 if (len > max_len) {
801 cERROR(1, ("bad search response length %d past smb end", len));
802 return -EINVAL;
803 }
804
805 if (unicode) {
806 /* BB fixme - test with long names */
807 /* Note converted filename can be longer than in unicode */
808 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR)
809 pqst->len = cifs_convertUCSpath((char *)pqst->name,
810 (__le16 *)filename, len/2, nlt);
811 else
812 pqst->len = cifs_strfromUCS_le((char *)pqst->name,
813 (__le16 *)filename, len/2, nlt);
814 } else {
815 pqst->name = filename;
816 pqst->len = len;
817 }
818 pqst->hash = full_name_hash(pqst->name, pqst->len);
819 /* cFYI(1, ("filldir on %s",pqst->name)); */
820 return rc;
821 }
822
823 static int cifs_filldir(char *pfindEntry, struct file *file,
824 filldir_t filldir, void *direntry, char *scratch_buf, int max_len)
825 {
826 int rc = 0;
827 struct qstr qstring;
828 struct cifsFileInfo *pCifsF;
829 unsigned obj_type;
830 ino_t inum;
831 struct cifs_sb_info *cifs_sb;
832 struct inode *tmp_inode;
833 struct dentry *tmp_dentry;
834
835 /* get filename and len into qstring */
836 /* get dentry */
837 /* decide whether to create and populate ionde */
838 if ((direntry == NULL) || (file == NULL))
839 return -EINVAL;
840
841 pCifsF = file->private_data;
842
843 if ((scratch_buf == NULL) || (pfindEntry == NULL) || (pCifsF == NULL))
844 return -ENOENT;
845
846 rc = cifs_entry_is_dot(pfindEntry, pCifsF);
847 /* skip . and .. since we added them first */
848 if (rc != 0)
849 return 0;
850
851 cifs_sb = CIFS_SB(file->f_path.dentry->d_sb);
852
853 qstring.name = scratch_buf;
854 rc = cifs_get_name_from_search_buf(&qstring, pfindEntry,
855 pCifsF->srch_inf.info_level,
856 pCifsF->srch_inf.unicode, cifs_sb,
857 max_len,
858 &inum /* returned */);
859
860 if (rc)
861 return rc;
862
863 rc = construct_dentry(&qstring, file, &tmp_inode, &tmp_dentry);
864 if ((tmp_inode == NULL) || (tmp_dentry == NULL))
865 return -ENOMEM;
866
867 if (rc) {
868 /* inode created, we need to hash it with right inode number */
869 if (inum != 0) {
870 /* BB fixme - hash the 2 32 quantities bits together if
871 * necessary BB */
872 tmp_inode->i_ino = inum;
873 }
874 insert_inode_hash(tmp_inode);
875 }
876
877 /* we pass in rc below, indicating whether it is a new inode,
878 so we can figure out whether to invalidate the inode cached
879 data if the file has changed */
880 if (pCifsF->srch_inf.info_level == SMB_FIND_FILE_UNIX)
881 unix_fill_in_inode(tmp_inode,
882 (FILE_UNIX_INFO *)pfindEntry,
883 &obj_type, rc);
884 else if (pCifsF->srch_inf.info_level == SMB_FIND_FILE_INFO_STANDARD)
885 fill_in_inode(tmp_inode, 0 /* old level 1 buffer type */,
886 pfindEntry, &obj_type, rc);
887 else
888 fill_in_inode(tmp_inode, 1 /* NT */, pfindEntry, &obj_type, rc);
889
890 if (rc) /* new inode - needs to be tied to dentry */ {
891 d_instantiate(tmp_dentry, tmp_inode);
892 if (rc == 2)
893 d_rehash(tmp_dentry);
894 }
895
896
897 rc = filldir(direntry, qstring.name, qstring.len, file->f_pos,
898 tmp_inode->i_ino, obj_type);
899 if (rc) {
900 cFYI(1, ("filldir rc = %d", rc));
901 /* we can not return filldir errors to the caller
902 since they are "normal" when the stat blocksize
903 is too small - we return remapped error instead */
904 rc = -EOVERFLOW;
905 }
906
907 dput(tmp_dentry);
908 return rc;
909 }
910
911 static int cifs_save_resume_key(const char *current_entry,
912 struct cifsFileInfo *cifsFile)
913 {
914 int rc = 0;
915 unsigned int len = 0;
916 __u16 level;
917 char *filename;
918
919 if ((cifsFile == NULL) || (current_entry == NULL))
920 return -EINVAL;
921
922 level = cifsFile->srch_inf.info_level;
923
924 if (level == SMB_FIND_FILE_UNIX) {
925 FILE_UNIX_INFO * pFindData = (FILE_UNIX_INFO *)current_entry;
926
927 filename = &pFindData->FileName[0];
928 if (cifsFile->srch_inf.unicode) {
929 len = cifs_unicode_bytelen(filename);
930 } else {
931 /* BB should we make this strnlen of PATH_MAX? */
932 len = strnlen(filename, PATH_MAX);
933 }
934 cifsFile->srch_inf.resume_key = pFindData->ResumeKey;
935 } else if (level == SMB_FIND_FILE_DIRECTORY_INFO) {
936 FILE_DIRECTORY_INFO *pFindData =
937 (FILE_DIRECTORY_INFO *)current_entry;
938 filename = &pFindData->FileName[0];
939 len = le32_to_cpu(pFindData->FileNameLength);
940 cifsFile->srch_inf.resume_key = pFindData->FileIndex;
941 } else if (level == SMB_FIND_FILE_FULL_DIRECTORY_INFO) {
942 FILE_FULL_DIRECTORY_INFO *pFindData =
943 (FILE_FULL_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_ID_FULL_DIR_INFO) {
948 SEARCH_ID_FULL_DIR_INFO *pFindData =
949 (SEARCH_ID_FULL_DIR_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_BOTH_DIRECTORY_INFO) {
954 FILE_BOTH_DIRECTORY_INFO *pFindData =
955 (FILE_BOTH_DIRECTORY_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_INFO_STANDARD) {
960 FIND_FILE_STANDARD_INFO *pFindData =
961 (FIND_FILE_STANDARD_INFO *)current_entry;
962 filename = &pFindData->FileName[0];
963 /* one byte length, no name conversion */
964 len = (unsigned int)pFindData->FileNameLength;
965 cifsFile->srch_inf.resume_key = pFindData->ResumeKey;
966 } else {
967 cFYI(1, ("Unknown findfirst level %d", level));
968 return -EINVAL;
969 }
970 cifsFile->srch_inf.resume_name_len = len;
971 cifsFile->srch_inf.presume_name = filename;
972 return rc;
973 }
974
975 int cifs_readdir(struct file *file, void *direntry, filldir_t filldir)
976 {
977 int rc = 0;
978 int xid, i;
979 struct cifs_sb_info *cifs_sb;
980 struct cifsTconInfo *pTcon;
981 struct cifsFileInfo *cifsFile = NULL;
982 char *current_entry;
983 int num_to_fill = 0;
984 char *tmp_buf = NULL;
985 char *end_of_smb;
986 int max_len;
987
988 xid = GetXid();
989
990 cifs_sb = CIFS_SB(file->f_path.dentry->d_sb);
991 pTcon = cifs_sb->tcon;
992 if (pTcon == NULL)
993 return -EINVAL;
994
995 switch ((int) file->f_pos) {
996 case 0:
997 if (filldir(direntry, ".", 1, file->f_pos,
998 file->f_path.dentry->d_inode->i_ino, DT_DIR) < 0) {
999 cERROR(1, ("Filldir for current dir failed"));
1000 rc = -ENOMEM;
1001 break;
1002 }
1003 file->f_pos++;
1004 case 1:
1005 if (filldir(direntry, "..", 2, file->f_pos,
1006 file->f_path.dentry->d_parent->d_inode->i_ino, DT_DIR) < 0) {
1007 cERROR(1, ("Filldir for parent dir failed"));
1008 rc = -ENOMEM;
1009 break;
1010 }
1011 file->f_pos++;
1012 default:
1013 /* 1) If search is active,
1014 is in current search buffer?
1015 if it before then restart search
1016 if after then keep searching till find it */
1017
1018 if (file->private_data == NULL) {
1019 rc = initiate_cifs_search(xid, file);
1020 cFYI(1, ("initiate cifs search rc %d", rc));
1021 if (rc) {
1022 FreeXid(xid);
1023 return rc;
1024 }
1025 }
1026 if (file->private_data == NULL) {
1027 rc = -EINVAL;
1028 FreeXid(xid);
1029 return rc;
1030 }
1031 cifsFile = file->private_data;
1032 if (cifsFile->srch_inf.endOfSearch) {
1033 if (cifsFile->srch_inf.emptyDir) {
1034 cFYI(1, ("End of search, empty dir"));
1035 rc = 0;
1036 break;
1037 }
1038 } /* else {
1039 cifsFile->invalidHandle = TRUE;
1040 CIFSFindClose(xid, pTcon, cifsFile->netfid);
1041 }
1042 kfree(cifsFile->search_resume_name);
1043 cifsFile->search_resume_name = NULL; */
1044
1045 rc = find_cifs_entry(xid, pTcon, file,
1046 &current_entry, &num_to_fill);
1047 if (rc) {
1048 cFYI(1, ("fce error %d", rc));
1049 goto rddir2_exit;
1050 } else if (current_entry != NULL) {
1051 cFYI(1, ("entry %lld found", file->f_pos));
1052 } else {
1053 cFYI(1, ("could not find entry"));
1054 goto rddir2_exit;
1055 }
1056 cFYI(1, ("loop through %d times filling dir for net buf %p",
1057 num_to_fill, cifsFile->srch_inf.ntwrk_buf_start));
1058 max_len = smbCalcSize((struct smb_hdr *)
1059 cifsFile->srch_inf.ntwrk_buf_start);
1060 end_of_smb = cifsFile->srch_inf.ntwrk_buf_start + max_len;
1061
1062 /* To be safe - for UCS to UTF-8 with strings loaded
1063 with the rare long characters alloc more to account for
1064 such multibyte target UTF-8 characters. cifs_unicode.c,
1065 which actually does the conversion, has the same limit */
1066 tmp_buf = kmalloc((2 * NAME_MAX) + 4, GFP_KERNEL);
1067 for (i = 0; (i < num_to_fill) && (rc == 0); i++) {
1068 if (current_entry == NULL) {
1069 /* evaluate whether this case is an error */
1070 cERROR(1,("past end of SMB num to fill %d i %d",
1071 num_to_fill, i));
1072 break;
1073 }
1074 /* if buggy server returns . and .. late do
1075 we want to check for that here? */
1076 rc = cifs_filldir(current_entry, file,
1077 filldir, direntry, tmp_buf, max_len);
1078 if (rc == -EOVERFLOW) {
1079 rc = 0;
1080 break;
1081 }
1082
1083 file->f_pos++;
1084 if (file->f_pos ==
1085 cifsFile->srch_inf.index_of_last_entry) {
1086 cFYI(1, ("last entry in buf at pos %lld %s",
1087 file->f_pos, tmp_buf));
1088 cifs_save_resume_key(current_entry, cifsFile);
1089 break;
1090 } else
1091 current_entry =
1092 nxt_dir_entry(current_entry, end_of_smb,
1093 cifsFile->srch_inf.info_level);
1094 }
1095 kfree(tmp_buf);
1096 break;
1097 } /* end switch */
1098
1099 rddir2_exit:
1100 FreeXid(xid);
1101 return rc;
1102 }
USB Experimental Work