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holepunch: fix mmap_sem i_mutex deadlock
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / fs / cifs / readdir.c
blobd1d79fe3c86feb287d353da64814a799813ea1d2
1 /*
2 * fs/cifs/readdir.c
3 *
4 * Directory search handling
5 *
6 * Copyright (C) International Business Machines Corp., 2004, 2005
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 <linux/smp_lock.h>
27 #include "cifspdu.h"
28 #include "cifsglob.h"
29 #include "cifsproto.h"
30 #include "cifs_unicode.h"
31 #include "cifs_debug.h"
32 #include "cifs_fs_sb.h"
33 #include "cifsfs.h"
34
35 #ifdef CONFIG_CIFS_DEBUG2
36 static void dump_cifs_file_struct(struct file *file, char *label)
37 {
38 struct cifsFileInfo * cf;
39
40 if(file) {
41 cf = file->private_data;
42 if(cf == NULL) {
43 cFYI(1,("empty cifs private file data"));
44 return;
45 }
46 if(cf->invalidHandle) {
47 cFYI(1,("invalid handle"));
48 }
49 if(cf->srch_inf.endOfSearch) {
50 cFYI(1,("end of search"));
51 }
52 if(cf->srch_inf.emptyDir) {
53 cFYI(1,("empty dir"));
54 }
55
56 }
57 }
58 #endif /* DEBUG2 */
59
60 /* Returns one if new inode created (which therefore needs to be hashed) */
61 /* Might check in the future if inode number changed so we can rehash inode */
62 static int construct_dentry(struct qstr *qstring, struct file *file,
63 struct inode **ptmp_inode, struct dentry **pnew_dentry)
64 {
65 struct dentry *tmp_dentry;
66 struct cifs_sb_info *cifs_sb;
67 struct cifsTconInfo *pTcon;
68 int rc = 0;
69
70 cFYI(1, ("For %s", qstring->name));
71 cifs_sb = CIFS_SB(file->f_path.dentry->d_sb);
72 pTcon = cifs_sb->tcon;
73
74 qstring->hash = full_name_hash(qstring->name, qstring->len);
75 tmp_dentry = d_lookup(file->f_path.dentry, qstring);
76 if (tmp_dentry) {
77 cFYI(0, ("existing dentry with inode 0x%p", tmp_dentry->d_inode));
78 *ptmp_inode = tmp_dentry->d_inode;
79 /* BB overwrite old name? i.e. tmp_dentry->d_name and tmp_dentry->d_name.len??*/
80 if(*ptmp_inode == NULL) {
81 *ptmp_inode = new_inode(file->f_path.dentry->d_sb);
82 if(*ptmp_inode == NULL)
83 return rc;
84 rc = 1;
85 }
86 } else {
87 tmp_dentry = d_alloc(file->f_path.dentry, qstring);
88 if(tmp_dentry == NULL) {
89 cERROR(1,("Failed allocating dentry"));
90 *ptmp_inode = NULL;
91 return rc;
92 }
93
94 *ptmp_inode = new_inode(file->f_path.dentry->d_sb);
95 if (pTcon->nocase)
96 tmp_dentry->d_op = &cifs_ci_dentry_ops;
97 else
98 tmp_dentry->d_op = &cifs_dentry_ops;
99 if(*ptmp_inode == NULL)
100 return rc;
101 rc = 2;
102 }
103
104 tmp_dentry->d_time = jiffies;
105 *pnew_dentry = tmp_dentry;
106 return rc;
107 }
108
109 static void AdjustForTZ(struct cifsTconInfo * tcon, struct inode * inode)
110 {
111 if((tcon) && (tcon->ses) && (tcon->ses->server)) {
112 inode->i_ctime.tv_sec += tcon->ses->server->timeAdj;
113 inode->i_mtime.tv_sec += tcon->ses->server->timeAdj;
114 inode->i_atime.tv_sec += tcon->ses->server->timeAdj;
115 }
116 return;
117 }
118
119
120 static void fill_in_inode(struct inode *tmp_inode, int new_buf_type,
121 char * buf, int *pobject_type, int isNewInode)
122 {
123 loff_t local_size;
124 struct timespec local_mtime;
125
126 struct cifsInodeInfo *cifsInfo = CIFS_I(tmp_inode);
127 struct cifs_sb_info *cifs_sb = CIFS_SB(tmp_inode->i_sb);
128 __u32 attr;
129 __u64 allocation_size;
130 __u64 end_of_file;
131
132 /* save mtime and size */
133 local_mtime = tmp_inode->i_mtime;
134 local_size = tmp_inode->i_size;
135
136 if(new_buf_type) {
137 FILE_DIRECTORY_INFO *pfindData = (FILE_DIRECTORY_INFO *)buf;
138
139 attr = le32_to_cpu(pfindData->ExtFileAttributes);
140 allocation_size = le64_to_cpu(pfindData->AllocationSize);
141 end_of_file = le64_to_cpu(pfindData->EndOfFile);
142 tmp_inode->i_atime =
143 cifs_NTtimeToUnix(le64_to_cpu(pfindData->LastAccessTime));
144 tmp_inode->i_mtime =
145 cifs_NTtimeToUnix(le64_to_cpu(pfindData->LastWriteTime));
146 tmp_inode->i_ctime =
147 cifs_NTtimeToUnix(le64_to_cpu(pfindData->ChangeTime));
148 } else { /* legacy, OS2 and DOS style */
149 /* struct timespec ts;*/
150 FIND_FILE_STANDARD_INFO * pfindData =
151 (FIND_FILE_STANDARD_INFO *)buf;
152
153 tmp_inode->i_mtime = cnvrtDosUnixTm(
154 le16_to_cpu(pfindData->LastWriteDate),
155 le16_to_cpu(pfindData->LastWriteTime));
156 tmp_inode->i_atime = cnvrtDosUnixTm(
157 le16_to_cpu(pfindData->LastAccessDate),
158 le16_to_cpu(pfindData->LastAccessTime));
159 tmp_inode->i_ctime = cnvrtDosUnixTm(
160 le16_to_cpu(pfindData->LastWriteDate),
161 le16_to_cpu(pfindData->LastWriteTime));
162 AdjustForTZ(cifs_sb->tcon, tmp_inode);
163 attr = le16_to_cpu(pfindData->Attributes);
164 allocation_size = le32_to_cpu(pfindData->AllocationSize);
165 end_of_file = le32_to_cpu(pfindData->DataSize);
166 }
167
168 /* Linux can not store file creation time unfortunately so ignore it */
169
170 cifsInfo->cifsAttrs = attr;
171 cifsInfo->time = jiffies;
172
173 /* treat dos attribute of read-only as read-only mode bit e.g. 555? */
174 /* 2767 perms - indicate mandatory locking */
175 /* BB fill in uid and gid here? with help from winbind?
176 or retrieve from NTFS stream extended attribute */
177 if (atomic_read(&cifsInfo->inUse) == 0) {
178 tmp_inode->i_uid = cifs_sb->mnt_uid;
179 tmp_inode->i_gid = cifs_sb->mnt_gid;
180 /* set default mode. will override for dirs below */
181 tmp_inode->i_mode = cifs_sb->mnt_file_mode;
182 } else {
183 /* mask off the type bits since it gets set
184 below and we do not want to get two type
185 bits set */
186 tmp_inode->i_mode &= ~S_IFMT;
187 }
188
189 if (attr & ATTR_DIRECTORY) {
190 *pobject_type = DT_DIR;
191 /* override default perms since we do not lock dirs */
192 if(atomic_read(&cifsInfo->inUse) == 0) {
193 tmp_inode->i_mode = cifs_sb->mnt_dir_mode;
194 }
195 tmp_inode->i_mode |= S_IFDIR;
196 } else if ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_UNX_EMUL) &&
197 (attr & ATTR_SYSTEM)) {
198 if (end_of_file == 0) {
199 *pobject_type = DT_FIFO;
200 tmp_inode->i_mode |= S_IFIFO;
201 } else {
202 /* rather than get the type here, we mark the
203 inode as needing revalidate and get the real type
204 (blk vs chr vs. symlink) later ie in lookup */
205 *pobject_type = DT_REG;
206 tmp_inode->i_mode |= S_IFREG;
207 cifsInfo->time = 0;
208 }
209 /* we no longer mark these because we could not follow them */
210 /* } else if (attr & ATTR_REPARSE) {
211 *pobject_type = DT_LNK;
212 tmp_inode->i_mode |= S_IFLNK; */
213 } else {
214 *pobject_type = DT_REG;
215 tmp_inode->i_mode |= S_IFREG;
216 if (attr & ATTR_READONLY)
217 tmp_inode->i_mode &= ~(S_IWUGO);
218 else if ((tmp_inode->i_mode & S_IWUGO) == 0)
219 /* the ATTR_READONLY flag may have been changed on */
220 /* server -- set any w bits allowed by mnt_file_mode */
221 tmp_inode->i_mode |= (S_IWUGO & cifs_sb->mnt_file_mode);
222 } /* could add code here - to validate if device or weird share type? */
223
224 /* can not fill in nlink here as in qpathinfo version and Unx search */
225 if (atomic_read(&cifsInfo->inUse) == 0) {
226 atomic_set(&cifsInfo->inUse, 1);
227 }
228
229 if (is_size_safe_to_change(cifsInfo)) {
230 /* can not safely change the file size here if the
231 client is writing to it due to potential races */
232 i_size_write(tmp_inode, end_of_file);
233
234 /* 512 bytes (2**9) is the fake blocksize that must be used */
235 /* for this calculation, even though the reported blocksize is larger */
236 tmp_inode->i_blocks = (512 - 1 + allocation_size) >> 9;
237 }
238
239 if (allocation_size < end_of_file)
240 cFYI(1, ("May be sparse file, allocation less than file size"));
241 cFYI(1, ("File Size %ld and blocks %llu",
242 (unsigned long)tmp_inode->i_size,
243 (unsigned long long)tmp_inode->i_blocks));
244 if (S_ISREG(tmp_inode->i_mode)) {
245 cFYI(1, ("File inode"));
246 tmp_inode->i_op = &cifs_file_inode_ops;
247 if(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DIRECT_IO) {
248 if(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_BRL)
249 tmp_inode->i_fop = &cifs_file_direct_nobrl_ops;
250 else
251 tmp_inode->i_fop = &cifs_file_direct_ops;
252
253 } else if(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_BRL)
254 tmp_inode->i_fop = &cifs_file_nobrl_ops;
255 else
256 tmp_inode->i_fop = &cifs_file_ops;
257
258 if((cifs_sb->tcon) && (cifs_sb->tcon->ses) &&
259 (cifs_sb->tcon->ses->server->maxBuf <
260 PAGE_CACHE_SIZE + MAX_CIFS_HDR_SIZE))
261 tmp_inode->i_data.a_ops = &cifs_addr_ops_smallbuf;
262 else
263 tmp_inode->i_data.a_ops = &cifs_addr_ops;
264
265 if(isNewInode)
266 return; /* No sense invalidating pages for new inode
267 since have not started caching readahead file
268 data yet */
269
270 if (timespec_equal(&tmp_inode->i_mtime, &local_mtime) &&
271 (local_size == tmp_inode->i_size)) {
272 cFYI(1, ("inode exists but unchanged"));
273 } else {
274 /* file may have changed on server */
275 cFYI(1, ("invalidate inode, readdir detected change"));
276 invalidate_remote_inode(tmp_inode);
277 }
278 } else if (S_ISDIR(tmp_inode->i_mode)) {
279 cFYI(1, ("Directory inode"));
280 tmp_inode->i_op = &cifs_dir_inode_ops;
281 tmp_inode->i_fop = &cifs_dir_ops;
282 } else if (S_ISLNK(tmp_inode->i_mode)) {
283 cFYI(1, ("Symbolic Link inode"));
284 tmp_inode->i_op = &cifs_symlink_inode_ops;
285 } else {
286 cFYI(1, ("Init special inode"));
287 init_special_inode(tmp_inode, tmp_inode->i_mode,
288 tmp_inode->i_rdev);
289 }
290 }
291
292 static void unix_fill_in_inode(struct inode *tmp_inode,
293 FILE_UNIX_INFO *pfindData, int *pobject_type, int isNewInode)
294 {
295 loff_t local_size;
296 struct timespec local_mtime;
297
298 struct cifsInodeInfo *cifsInfo = CIFS_I(tmp_inode);
299 struct cifs_sb_info *cifs_sb = CIFS_SB(tmp_inode->i_sb);
300
301 __u32 type = le32_to_cpu(pfindData->Type);
302 __u64 num_of_bytes = le64_to_cpu(pfindData->NumOfBytes);
303 __u64 end_of_file = le64_to_cpu(pfindData->EndOfFile);
304 cifsInfo->time = jiffies;
305 atomic_inc(&cifsInfo->inUse);
306
307 /* save mtime and size */
308 local_mtime = tmp_inode->i_mtime;
309 local_size = tmp_inode->i_size;
310
311 tmp_inode->i_atime =
312 cifs_NTtimeToUnix(le64_to_cpu(pfindData->LastAccessTime));
313 tmp_inode->i_mtime =
314 cifs_NTtimeToUnix(le64_to_cpu(pfindData->LastModificationTime));
315 tmp_inode->i_ctime =
316 cifs_NTtimeToUnix(le64_to_cpu(pfindData->LastStatusChange));
317
318 tmp_inode->i_mode = le64_to_cpu(pfindData->Permissions);
319 /* since we set the inode type below we need to mask off type
320 to avoid strange results if bits above were corrupt */
321 tmp_inode->i_mode &= ~S_IFMT;
322 if (type == UNIX_FILE) {
323 *pobject_type = DT_REG;
324 tmp_inode->i_mode |= S_IFREG;
325 } else if (type == UNIX_SYMLINK) {
326 *pobject_type = DT_LNK;
327 tmp_inode->i_mode |= S_IFLNK;
328 } else if (type == UNIX_DIR) {
329 *pobject_type = DT_DIR;
330 tmp_inode->i_mode |= S_IFDIR;
331 } else if (type == UNIX_CHARDEV) {
332 *pobject_type = DT_CHR;
333 tmp_inode->i_mode |= S_IFCHR;
334 tmp_inode->i_rdev = MKDEV(le64_to_cpu(pfindData->DevMajor),
335 le64_to_cpu(pfindData->DevMinor) & MINORMASK);
336 } else if (type == UNIX_BLOCKDEV) {
337 *pobject_type = DT_BLK;
338 tmp_inode->i_mode |= S_IFBLK;
339 tmp_inode->i_rdev = MKDEV(le64_to_cpu(pfindData->DevMajor),
340 le64_to_cpu(pfindData->DevMinor) & MINORMASK);
341 } else if (type == UNIX_FIFO) {
342 *pobject_type = DT_FIFO;
343 tmp_inode->i_mode |= S_IFIFO;
344 } else if (type == UNIX_SOCKET) {
345 *pobject_type = DT_SOCK;
346 tmp_inode->i_mode |= S_IFSOCK;
347 } else {
348 /* safest to just call it a file */
349 *pobject_type = DT_REG;
350 tmp_inode->i_mode |= S_IFREG;
351 cFYI(1,("unknown inode type %d",type));
352 }
353
354 tmp_inode->i_uid = le64_to_cpu(pfindData->Uid);
355 tmp_inode->i_gid = le64_to_cpu(pfindData->Gid);
356 tmp_inode->i_nlink = le64_to_cpu(pfindData->Nlinks);
357
358 if (is_size_safe_to_change(cifsInfo)) {
359 /* can not safely change the file size here if the
360 client is writing to it due to potential races */
361 i_size_write(tmp_inode,end_of_file);
362
363 /* 512 bytes (2**9) is the fake blocksize that must be used */
364 /* for this calculation, not the real blocksize */
365 tmp_inode->i_blocks = (512 - 1 + num_of_bytes) >> 9;
366 }
367
368 if (S_ISREG(tmp_inode->i_mode)) {
369 cFYI(1, ("File inode"));
370 tmp_inode->i_op = &cifs_file_inode_ops;
371
372 if(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DIRECT_IO) {
373 if(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_BRL)
374 tmp_inode->i_fop = &cifs_file_direct_nobrl_ops;
375 else
376 tmp_inode->i_fop = &cifs_file_direct_ops;
377
378 } else if(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_BRL)
379 tmp_inode->i_fop = &cifs_file_nobrl_ops;
380 else
381 tmp_inode->i_fop = &cifs_file_ops;
382
383 if((cifs_sb->tcon) && (cifs_sb->tcon->ses) &&
384 (cifs_sb->tcon->ses->server->maxBuf <
385 PAGE_CACHE_SIZE + MAX_CIFS_HDR_SIZE))
386 tmp_inode->i_data.a_ops = &cifs_addr_ops_smallbuf;
387 else
388 tmp_inode->i_data.a_ops = &cifs_addr_ops;
389
390 if(isNewInode)
391 return; /* No sense invalidating pages for new inode since we
392 have not started caching readahead file data yet */
393
394 if (timespec_equal(&tmp_inode->i_mtime, &local_mtime) &&
395 (local_size == tmp_inode->i_size)) {
396 cFYI(1, ("inode exists but unchanged"));
397 } else {
398 /* file may have changed on server */
399 cFYI(1, ("invalidate inode, readdir detected change"));
400 invalidate_remote_inode(tmp_inode);
401 }
402 } else if (S_ISDIR(tmp_inode->i_mode)) {
403 cFYI(1, ("Directory inode"));
404 tmp_inode->i_op = &cifs_dir_inode_ops;
405 tmp_inode->i_fop = &cifs_dir_ops;
406 } else if (S_ISLNK(tmp_inode->i_mode)) {
407 cFYI(1, ("Symbolic Link inode"));
408 tmp_inode->i_op = &cifs_symlink_inode_ops;
409 /* tmp_inode->i_fop = *//* do not need to set to anything */
410 } else {
411 cFYI(1, ("Special inode"));
412 init_special_inode(tmp_inode, tmp_inode->i_mode,
413 tmp_inode->i_rdev);
414 }
415 }
416
417 static int initiate_cifs_search(const int xid, struct file *file)
418 {
419 int rc = 0;
420 char * full_path;
421 struct cifsFileInfo * cifsFile;
422 struct cifs_sb_info *cifs_sb;
423 struct cifsTconInfo *pTcon;
424
425 if(file->private_data == NULL) {
426 file->private_data =
427 kmalloc(sizeof(struct cifsFileInfo),GFP_KERNEL);
428 }
429
430 if(file->private_data == NULL) {
431 return -ENOMEM;
432 } else {
433 memset(file->private_data,0,sizeof(struct cifsFileInfo));
434 }
435 cifsFile = file->private_data;
436 cifsFile->invalidHandle = TRUE;
437 cifsFile->srch_inf.endOfSearch = FALSE;
438
439 if(file->f_path.dentry == NULL)
440 return -ENOENT;
441
442 cifs_sb = CIFS_SB(file->f_path.dentry->d_sb);
443 if(cifs_sb == NULL)
444 return -EINVAL;
445
446 pTcon = cifs_sb->tcon;
447 if(pTcon == NULL)
448 return -EINVAL;
449
450 full_path = build_path_from_dentry(file->f_path.dentry);
451
452 if(full_path == NULL) {
453 return -ENOMEM;
454 }
455
456 cFYI(1, ("Full path: %s start at: %lld", full_path, file->f_pos));
457
458 ffirst_retry:
459 /* test for Unix extensions */
460 if (pTcon->ses->capabilities & CAP_UNIX) {
461 cifsFile->srch_inf.info_level = SMB_FIND_FILE_UNIX;
462 } else if ((pTcon->ses->capabilities &
463 (CAP_NT_SMBS | CAP_NT_FIND)) == 0) {
464 cifsFile->srch_inf.info_level = SMB_FIND_FILE_INFO_STANDARD;
465 } else if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM) {
466 cifsFile->srch_inf.info_level = SMB_FIND_FILE_ID_FULL_DIR_INFO;
467 } else /* not srvinos - BB fixme add check for backlevel? */ {
468 cifsFile->srch_inf.info_level = SMB_FIND_FILE_DIRECTORY_INFO;
469 }
470
471 rc = CIFSFindFirst(xid, pTcon,full_path,cifs_sb->local_nls,
472 &cifsFile->netfid, &cifsFile->srch_inf,
473 cifs_sb->mnt_cifs_flags &
474 CIFS_MOUNT_MAP_SPECIAL_CHR, CIFS_DIR_SEP(cifs_sb));
475 if(rc == 0)
476 cifsFile->invalidHandle = FALSE;
477 if((rc == -EOPNOTSUPP) &&
478 (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM)) {
479 cifs_sb->mnt_cifs_flags &= ~CIFS_MOUNT_SERVER_INUM;
480 goto ffirst_retry;
481 }
482 kfree(full_path);
483 return rc;
484 }
485
486 /* return length of unicode string in bytes */
487 static int cifs_unicode_bytelen(char *str)
488 {
489 int len;
490 __le16 * ustr = (__le16 *)str;
491
492 for(len=0;len <= PATH_MAX;len++) {
493 if(ustr[len] == 0)
494 return len << 1;
495 }
496 cFYI(1,("Unicode string longer than PATH_MAX found"));
497 return len << 1;
498 }
499
500 static char *nxt_dir_entry(char *old_entry, char *end_of_smb, int level)
501 {
502 char * new_entry;
503 FILE_DIRECTORY_INFO * pDirInfo = (FILE_DIRECTORY_INFO *)old_entry;
504
505 if(level == SMB_FIND_FILE_INFO_STANDARD) {
506 FIND_FILE_STANDARD_INFO * pfData;
507 pfData = (FIND_FILE_STANDARD_INFO *)pDirInfo;
508
509 new_entry = old_entry + sizeof(FIND_FILE_STANDARD_INFO) +
510 pfData->FileNameLength;
511 } else
512 new_entry = old_entry + le32_to_cpu(pDirInfo->NextEntryOffset);
513 cFYI(1,("new entry %p old entry %p",new_entry,old_entry));
514 /* validate that new_entry is not past end of SMB */
515 if(new_entry >= end_of_smb) {
516 cERROR(1,
517 ("search entry %p began after end of SMB %p old entry %p",
518 new_entry, end_of_smb, old_entry));
519 return NULL;
520 } else if(((level == SMB_FIND_FILE_INFO_STANDARD) &&
521 (new_entry + sizeof(FIND_FILE_STANDARD_INFO) > end_of_smb)) ||
522 ((level != SMB_FIND_FILE_INFO_STANDARD) &&
523 (new_entry + sizeof(FILE_DIRECTORY_INFO) > end_of_smb))) {
524 cERROR(1,("search entry %p extends after end of SMB %p",
525 new_entry, end_of_smb));
526 return NULL;
527 } else
528 return new_entry;
529
530 }
531
532 #define UNICODE_DOT cpu_to_le16(0x2e)
533
534 /* return 0 if no match and 1 for . (current directory) and 2 for .. (parent) */
535 static int cifs_entry_is_dot(char *current_entry, struct cifsFileInfo *cfile)
536 {
537 int rc = 0;
538 char * filename = NULL;
539 int len = 0;
540
541 if(cfile->srch_inf.info_level == SMB_FIND_FILE_UNIX) {
542 FILE_UNIX_INFO * pFindData = (FILE_UNIX_INFO *)current_entry;
543 filename = &pFindData->FileName[0];
544 if(cfile->srch_inf.unicode) {
545 len = cifs_unicode_bytelen(filename);
546 } else {
547 /* BB should we make this strnlen of PATH_MAX? */
548 len = strnlen(filename, 5);
549 }
550 } else if(cfile->srch_inf.info_level == SMB_FIND_FILE_DIRECTORY_INFO) {
551 FILE_DIRECTORY_INFO * pFindData =
552 (FILE_DIRECTORY_INFO *)current_entry;
553 filename = &pFindData->FileName[0];
554 len = le32_to_cpu(pFindData->FileNameLength);
555 } else if(cfile->srch_inf.info_level ==
556 SMB_FIND_FILE_FULL_DIRECTORY_INFO) {
557 FILE_FULL_DIRECTORY_INFO * pFindData =
558 (FILE_FULL_DIRECTORY_INFO *)current_entry;
559 filename = &pFindData->FileName[0];
560 len = le32_to_cpu(pFindData->FileNameLength);
561 } else if(cfile->srch_inf.info_level ==
562 SMB_FIND_FILE_ID_FULL_DIR_INFO) {
563 SEARCH_ID_FULL_DIR_INFO * pFindData =
564 (SEARCH_ID_FULL_DIR_INFO *)current_entry;
565 filename = &pFindData->FileName[0];
566 len = le32_to_cpu(pFindData->FileNameLength);
567 } else if(cfile->srch_inf.info_level ==
568 SMB_FIND_FILE_BOTH_DIRECTORY_INFO) {
569 FILE_BOTH_DIRECTORY_INFO * pFindData =
570 (FILE_BOTH_DIRECTORY_INFO *)current_entry;
571 filename = &pFindData->FileName[0];
572 len = le32_to_cpu(pFindData->FileNameLength);
573 } else if(cfile->srch_inf.info_level == SMB_FIND_FILE_INFO_STANDARD) {
574 FIND_FILE_STANDARD_INFO * pFindData =
575 (FIND_FILE_STANDARD_INFO *)current_entry;
576 filename = &pFindData->FileName[0];
577 len = pFindData->FileNameLength;
578 } else {
579 cFYI(1,("Unknown findfirst level %d",cfile->srch_inf.info_level));
580 }
581
582 if(filename) {
583 if(cfile->srch_inf.unicode) {
584 __le16 *ufilename = (__le16 *)filename;
585 if(len == 2) {
586 /* check for . */
587 if(ufilename[0] == UNICODE_DOT)
588 rc = 1;
589 } else if(len == 4) {
590 /* check for .. */
591 if((ufilename[0] == UNICODE_DOT)
592 &&(ufilename[1] == UNICODE_DOT))
593 rc = 2;
594 }
595 } else /* ASCII */ {
596 if(len == 1) {
597 if(filename[0] == '.')
598 rc = 1;
599 } else if(len == 2) {
600 if((filename[0] == '.') && (filename[1] == '.'))
601 rc = 2;
602 }
603 }
604 }
605
606 return rc;
607 }
608
609 /* Check if directory that we are searching has changed so we can decide
610 whether we can use the cached search results from the previous search */
611 static int is_dir_changed(struct file * file)
612 {
613 struct inode * inode;
614 struct cifsInodeInfo *cifsInfo;
615
616 if(file->f_path.dentry == NULL)
617 return 0;
618
619 inode = file->f_path.dentry->d_inode;
620
621 if(inode == NULL)
622 return 0;
623
624 cifsInfo = CIFS_I(inode);
625
626 if(cifsInfo->time == 0)
627 return 1; /* directory was changed, perhaps due to unlink */
628 else
629 return 0;
630
631 }
632
633 /* find the corresponding entry in the search */
634 /* Note that the SMB server returns search entries for . and .. which
635 complicates logic here if we choose to parse for them and we do not
636 assume that they are located in the findfirst return buffer.*/
637 /* We start counting in the buffer with entry 2 and increment for every
638 entry (do not increment for . or .. entry) */
639 static int find_cifs_entry(const int xid, struct cifsTconInfo *pTcon,
640 struct file *file, char **ppCurrentEntry, int *num_to_ret)
641 {
642 int rc = 0;
643 int pos_in_buf = 0;
644 loff_t first_entry_in_buffer;
645 loff_t index_to_find = file->f_pos;
646 struct cifsFileInfo * cifsFile = file->private_data;
647 /* check if index in the buffer */
648
649 if((cifsFile == NULL) || (ppCurrentEntry == NULL) ||
650 (num_to_ret == NULL))
651 return -ENOENT;
652
653 *ppCurrentEntry = NULL;
654 first_entry_in_buffer =
655 cifsFile->srch_inf.index_of_last_entry -
656 cifsFile->srch_inf.entries_in_buffer;
657
658 /* if first entry in buf is zero then is first buffer
659 in search response data which means it is likely . and ..
660 will be in this buffer, although some servers do not return
661 . and .. for the root of a drive and for those we need
662 to start two entries earlier */
663
664 #ifdef CONFIG_CIFS_DEBUG2
665 dump_cifs_file_struct(file, "In fce ");
666 #endif
667 if(((index_to_find < cifsFile->srch_inf.index_of_last_entry) &&
668 is_dir_changed(file)) ||
669 (index_to_find < first_entry_in_buffer)) {
670 /* close and restart search */
671 cFYI(1,("search backing up - close and restart search"));
672 cifsFile->invalidHandle = TRUE;
673 CIFSFindClose(xid, pTcon, cifsFile->netfid);
674 kfree(cifsFile->search_resume_name);
675 cifsFile->search_resume_name = NULL;
676 if(cifsFile->srch_inf.ntwrk_buf_start) {
677 cFYI(1,("freeing SMB ff cache buf on search rewind"));
678 if(cifsFile->srch_inf.smallBuf)
679 cifs_small_buf_release(cifsFile->srch_inf.
680 ntwrk_buf_start);
681 else
682 cifs_buf_release(cifsFile->srch_inf.
683 ntwrk_buf_start);
684 }
685 rc = initiate_cifs_search(xid,file);
686 if(rc) {
687 cFYI(1,("error %d reinitiating a search on rewind",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 entry"));
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 fixme */
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 if(file->f_path.dentry == NULL)
847 return -ENOENT;
848
849 rc = cifs_entry_is_dot(pfindEntry,pCifsF);
850 /* skip . and .. since we added them first */
851 if(rc != 0)
852 return 0;
853
854 cifs_sb = CIFS_SB(file->f_path.dentry->d_sb);
855
856 qstring.name = scratch_buf;
857 rc = cifs_get_name_from_search_buf(&qstring,pfindEntry,
858 pCifsF->srch_inf.info_level,
859 pCifsF->srch_inf.unicode,cifs_sb,
860 max_len,
861 &inum /* returned */);
862
863 if(rc)
864 return rc;
865
866 rc = construct_dentry(&qstring,file,&tmp_inode, &tmp_dentry);
867 if((tmp_inode == NULL) || (tmp_dentry == NULL))
868 return -ENOMEM;
869
870 if(rc) {
871 /* inode created, we need to hash it with right inode number */
872 if(inum != 0) {
873 /* BB fixme - hash the 2 32 quantities bits together if necessary BB */
874 tmp_inode->i_ino = inum;
875 }
876 insert_inode_hash(tmp_inode);
877 }
878
879 /* we pass in rc below, indicating whether it is a new inode,
880 so we can figure out whether to invalidate the inode cached
881 data if the file has changed */
882 if(pCifsF->srch_inf.info_level == SMB_FIND_FILE_UNIX)
883 unix_fill_in_inode(tmp_inode,
884 (FILE_UNIX_INFO *)pfindEntry,
885 &obj_type, rc);
886 else if(pCifsF->srch_inf.info_level == SMB_FIND_FILE_INFO_STANDARD)
887 fill_in_inode(tmp_inode, 0 /* old level 1 buffer type */,
888 pfindEntry, &obj_type, rc);
889 else
890 fill_in_inode(tmp_inode, 1 /* NT */, pfindEntry, &obj_type, rc);
891
892 if(rc) /* new inode - needs to be tied to dentry */ {
893 d_instantiate(tmp_dentry, tmp_inode);
894 if(rc == 2)
895 d_rehash(tmp_dentry);
896 }
897
898
899 rc = filldir(direntry,qstring.name,qstring.len,file->f_pos,
900 tmp_inode->i_ino,obj_type);
901 if(rc) {
902 cFYI(1,("filldir rc = %d",rc));
903 /* we can not return filldir errors to the caller
904 since they are "normal" when the stat blocksize
905 is too small - we return remapped error instead */
906 rc = -EOVERFLOW;
907 }
908
909 dput(tmp_dentry);
910 return rc;
911 }
912
913 static int cifs_save_resume_key(const char *current_entry,
914 struct cifsFileInfo *cifsFile)
915 {
916 int rc = 0;
917 unsigned int len = 0;
918 __u16 level;
919 char * filename;
920
921 if((cifsFile == NULL) || (current_entry == NULL))
922 return -EINVAL;
923
924 level = cifsFile->srch_inf.info_level;
925
926 if(level == SMB_FIND_FILE_UNIX) {
927 FILE_UNIX_INFO * pFindData = (FILE_UNIX_INFO *)current_entry;
928
929 filename = &pFindData->FileName[0];
930 if(cifsFile->srch_inf.unicode) {
931 len = cifs_unicode_bytelen(filename);
932 } else {
933 /* BB should we make this strnlen of PATH_MAX? */
934 len = strnlen(filename, PATH_MAX);
935 }
936 cifsFile->srch_inf.resume_key = pFindData->ResumeKey;
937 } else if(level == SMB_FIND_FILE_DIRECTORY_INFO) {
938 FILE_DIRECTORY_INFO * pFindData =
939 (FILE_DIRECTORY_INFO *)current_entry;
940 filename = &pFindData->FileName[0];
941 len = le32_to_cpu(pFindData->FileNameLength);
942 cifsFile->srch_inf.resume_key = pFindData->FileIndex;
943 } else if(level == SMB_FIND_FILE_FULL_DIRECTORY_INFO) {
944 FILE_FULL_DIRECTORY_INFO * pFindData =
945 (FILE_FULL_DIRECTORY_INFO *)current_entry;
946 filename = &pFindData->FileName[0];
947 len = le32_to_cpu(pFindData->FileNameLength);
948 cifsFile->srch_inf.resume_key = pFindData->FileIndex;
949 } else if(level == SMB_FIND_FILE_ID_FULL_DIR_INFO) {
950 SEARCH_ID_FULL_DIR_INFO * pFindData =
951 (SEARCH_ID_FULL_DIR_INFO *)current_entry;
952 filename = &pFindData->FileName[0];
953 len = le32_to_cpu(pFindData->FileNameLength);
954 cifsFile->srch_inf.resume_key = pFindData->FileIndex;
955 } else if(level == SMB_FIND_FILE_BOTH_DIRECTORY_INFO) {
956 FILE_BOTH_DIRECTORY_INFO * pFindData =
957 (FILE_BOTH_DIRECTORY_INFO *)current_entry;
958 filename = &pFindData->FileName[0];
959 len = le32_to_cpu(pFindData->FileNameLength);
960 cifsFile->srch_inf.resume_key = pFindData->FileIndex;
961 } else if(level == SMB_FIND_FILE_INFO_STANDARD) {
962 FIND_FILE_STANDARD_INFO * pFindData =
963 (FIND_FILE_STANDARD_INFO *)current_entry;
964 filename = &pFindData->FileName[0];
965 /* one byte length, no name conversion */
966 len = (unsigned int)pFindData->FileNameLength;
967 cifsFile->srch_inf.resume_key = pFindData->ResumeKey;
968 } else {
969 cFYI(1,("Unknown findfirst level %d",level));
970 return -EINVAL;
971 }
972 cifsFile->srch_inf.resume_name_len = len;
973 cifsFile->srch_inf.presume_name = filename;
974 return rc;
975 }
976
977 int cifs_readdir(struct file *file, void *direntry, filldir_t filldir)
978 {
979 int rc = 0;
980 int xid,i;
981 struct cifs_sb_info *cifs_sb;
982 struct cifsTconInfo *pTcon;
983 struct cifsFileInfo *cifsFile = NULL;
984 char * current_entry;
985 int num_to_fill = 0;
986 char * tmp_buf = NULL;
987 char * end_of_smb;
988 int max_len;
989
990 xid = GetXid();
991
992 if(file->f_path.dentry == NULL) {
993 FreeXid(xid);
994 return -EIO;
995 }
996
997 cifs_sb = CIFS_SB(file->f_path.dentry->d_sb);
998 pTcon = cifs_sb->tcon;
999 if(pTcon == NULL)
1000 return -EINVAL;
1001
1002 switch ((int) file->f_pos) {
1003 case 0:
1004 if (filldir(direntry, ".", 1, file->f_pos,
1005 file->f_path.dentry->d_inode->i_ino, DT_DIR) < 0) {
1006 cERROR(1, ("Filldir for current dir failed"));
1007 rc = -ENOMEM;
1008 break;
1009 }
1010 file->f_pos++;
1011 case 1:
1012 if (filldir(direntry, "..", 2, file->f_pos,
1013 file->f_path.dentry->d_parent->d_inode->i_ino, DT_DIR) < 0) {
1014 cERROR(1, ("Filldir for parent dir failed"));
1015 rc = -ENOMEM;
1016 break;
1017 }
1018 file->f_pos++;
1019 default:
1020 /* 1) If search is active,
1021 is in current search buffer?
1022 if it before then restart search
1023 if after then keep searching till find it */
1024
1025 if(file->private_data == NULL) {
1026 rc = initiate_cifs_search(xid,file);
1027 cFYI(1,("initiate cifs search rc %d",rc));
1028 if(rc) {
1029 FreeXid(xid);
1030 return rc;
1031 }
1032 }
1033 if(file->private_data == NULL) {
1034 rc = -EINVAL;
1035 FreeXid(xid);
1036 return rc;
1037 }
1038 cifsFile = file->private_data;
1039 if (cifsFile->srch_inf.endOfSearch) {
1040 if(cifsFile->srch_inf.emptyDir) {
1041 cFYI(1, ("End of search, empty dir"));
1042 rc = 0;
1043 break;
1044 }
1045 } /* else {
1046 cifsFile->invalidHandle = TRUE;
1047 CIFSFindClose(xid, pTcon, cifsFile->netfid);
1048 }
1049 kfree(cifsFile->search_resume_name);
1050 cifsFile->search_resume_name = NULL; */
1051
1052 rc = find_cifs_entry(xid,pTcon, file,
1053 &current_entry,&num_to_fill);
1054 if(rc) {
1055 cFYI(1,("fce error %d",rc));
1056 goto rddir2_exit;
1057 } else if (current_entry != NULL) {
1058 cFYI(1,("entry %lld found",file->f_pos));
1059 } else {
1060 cFYI(1,("could not find entry"));
1061 goto rddir2_exit;
1062 }
1063 cFYI(1,("loop through %d times filling dir for net buf %p",
1064 num_to_fill,cifsFile->srch_inf.ntwrk_buf_start));
1065 max_len = smbCalcSize((struct smb_hdr *)
1066 cifsFile->srch_inf.ntwrk_buf_start);
1067 end_of_smb = cifsFile->srch_inf.ntwrk_buf_start + max_len;
1068
1069 /* To be safe - for UCS to UTF-8 with strings loaded
1070 with the rare long characters alloc more to account for
1071 such multibyte target UTF-8 characters. cifs_unicode.c,
1072 which actually does the conversion, has the same limit */
1073 tmp_buf = kmalloc((2 * NAME_MAX) + 4, GFP_KERNEL);
1074 for(i=0;(i<num_to_fill) && (rc == 0);i++) {
1075 if(current_entry == NULL) {
1076 /* evaluate whether this case is an error */
1077 cERROR(1,("past end of SMB num to fill %d i %d",
1078 num_to_fill, i));
1079 break;
1080 }
1081 /* if buggy server returns . and .. late do
1082 we want to check for that here? */
1083 rc = cifs_filldir(current_entry, file,
1084 filldir, direntry, tmp_buf, max_len);
1085 if(rc == -EOVERFLOW) {
1086 rc = 0;
1087 break;
1088 }
1089
1090 file->f_pos++;
1091 if(file->f_pos ==
1092 cifsFile->srch_inf.index_of_last_entry) {
1093 cFYI(1,("last entry in buf at pos %lld %s",
1094 file->f_pos,tmp_buf));
1095 cifs_save_resume_key(current_entry,cifsFile);
1096 break;
1097 } else
1098 current_entry =
1099 nxt_dir_entry(current_entry, end_of_smb,
1100 cifsFile->srch_inf.info_level);
1101 }
1102 kfree(tmp_buf);
1103 break;
1104 } /* end switch */
1105
1106 rddir2_exit:
1107 FreeXid(xid);
1108 return rc;
1109 }
Linux 2.6 ibm-acpi/thinkpad-acpi driver git tree