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[SCSI] scsi_error: Fix lost EH commands
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / fs / cifs / readdir.c
blob99dfb5337e3169d8e38cf062a509326694b24a0d
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 } /* could add code here - to validate if device or weird share type? */
219
220 /* can not fill in nlink here as in qpathinfo version and Unx search */
221 if (atomic_read(&cifsInfo->inUse) == 0) {
222 atomic_set(&cifsInfo->inUse, 1);
223 }
224
225 if (is_size_safe_to_change(cifsInfo)) {
226 /* can not safely change the file size here if the
227 client is writing to it due to potential races */
228 i_size_write(tmp_inode, end_of_file);
229
230 /* 512 bytes (2**9) is the fake blocksize that must be used */
231 /* for this calculation, even though the reported blocksize is larger */
232 tmp_inode->i_blocks = (512 - 1 + allocation_size) >> 9;
233 }
234
235 if (allocation_size < end_of_file)
236 cFYI(1, ("May be sparse file, allocation less than file size"));
237 cFYI(1, ("File Size %ld and blocks %llu",
238 (unsigned long)tmp_inode->i_size,
239 (unsigned long long)tmp_inode->i_blocks));
240 if (S_ISREG(tmp_inode->i_mode)) {
241 cFYI(1, ("File inode"));
242 tmp_inode->i_op = &cifs_file_inode_ops;
243 if(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DIRECT_IO) {
244 if(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_BRL)
245 tmp_inode->i_fop = &cifs_file_direct_nobrl_ops;
246 else
247 tmp_inode->i_fop = &cifs_file_direct_ops;
248
249 } else if(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_BRL)
250 tmp_inode->i_fop = &cifs_file_nobrl_ops;
251 else
252 tmp_inode->i_fop = &cifs_file_ops;
253
254 if((cifs_sb->tcon) && (cifs_sb->tcon->ses) &&
255 (cifs_sb->tcon->ses->server->maxBuf <
256 PAGE_CACHE_SIZE + MAX_CIFS_HDR_SIZE))
257 tmp_inode->i_data.a_ops = &cifs_addr_ops_smallbuf;
258 else
259 tmp_inode->i_data.a_ops = &cifs_addr_ops;
260
261 if(isNewInode)
262 return; /* No sense invalidating pages for new inode
263 since have not started caching readahead file
264 data yet */
265
266 if (timespec_equal(&tmp_inode->i_mtime, &local_mtime) &&
267 (local_size == tmp_inode->i_size)) {
268 cFYI(1, ("inode exists but unchanged"));
269 } else {
270 /* file may have changed on server */
271 cFYI(1, ("invalidate inode, readdir detected change"));
272 invalidate_remote_inode(tmp_inode);
273 }
274 } else if (S_ISDIR(tmp_inode->i_mode)) {
275 cFYI(1, ("Directory inode"));
276 tmp_inode->i_op = &cifs_dir_inode_ops;
277 tmp_inode->i_fop = &cifs_dir_ops;
278 } else if (S_ISLNK(tmp_inode->i_mode)) {
279 cFYI(1, ("Symbolic Link inode"));
280 tmp_inode->i_op = &cifs_symlink_inode_ops;
281 } else {
282 cFYI(1, ("Init special inode"));
283 init_special_inode(tmp_inode, tmp_inode->i_mode,
284 tmp_inode->i_rdev);
285 }
286 }
287
288 static void unix_fill_in_inode(struct inode *tmp_inode,
289 FILE_UNIX_INFO *pfindData, int *pobject_type, int isNewInode)
290 {
291 loff_t local_size;
292 struct timespec local_mtime;
293
294 struct cifsInodeInfo *cifsInfo = CIFS_I(tmp_inode);
295 struct cifs_sb_info *cifs_sb = CIFS_SB(tmp_inode->i_sb);
296
297 __u32 type = le32_to_cpu(pfindData->Type);
298 __u64 num_of_bytes = le64_to_cpu(pfindData->NumOfBytes);
299 __u64 end_of_file = le64_to_cpu(pfindData->EndOfFile);
300 cifsInfo->time = jiffies;
301 atomic_inc(&cifsInfo->inUse);
302
303 /* save mtime and size */
304 local_mtime = tmp_inode->i_mtime;
305 local_size = tmp_inode->i_size;
306
307 tmp_inode->i_atime =
308 cifs_NTtimeToUnix(le64_to_cpu(pfindData->LastAccessTime));
309 tmp_inode->i_mtime =
310 cifs_NTtimeToUnix(le64_to_cpu(pfindData->LastModificationTime));
311 tmp_inode->i_ctime =
312 cifs_NTtimeToUnix(le64_to_cpu(pfindData->LastStatusChange));
313
314 tmp_inode->i_mode = le64_to_cpu(pfindData->Permissions);
315 /* since we set the inode type below we need to mask off type
316 to avoid strange results if bits above were corrupt */
317 tmp_inode->i_mode &= ~S_IFMT;
318 if (type == UNIX_FILE) {
319 *pobject_type = DT_REG;
320 tmp_inode->i_mode |= S_IFREG;
321 } else if (type == UNIX_SYMLINK) {
322 *pobject_type = DT_LNK;
323 tmp_inode->i_mode |= S_IFLNK;
324 } else if (type == UNIX_DIR) {
325 *pobject_type = DT_DIR;
326 tmp_inode->i_mode |= S_IFDIR;
327 } else if (type == UNIX_CHARDEV) {
328 *pobject_type = DT_CHR;
329 tmp_inode->i_mode |= S_IFCHR;
330 tmp_inode->i_rdev = MKDEV(le64_to_cpu(pfindData->DevMajor),
331 le64_to_cpu(pfindData->DevMinor) & MINORMASK);
332 } else if (type == UNIX_BLOCKDEV) {
333 *pobject_type = DT_BLK;
334 tmp_inode->i_mode |= S_IFBLK;
335 tmp_inode->i_rdev = MKDEV(le64_to_cpu(pfindData->DevMajor),
336 le64_to_cpu(pfindData->DevMinor) & MINORMASK);
337 } else if (type == UNIX_FIFO) {
338 *pobject_type = DT_FIFO;
339 tmp_inode->i_mode |= S_IFIFO;
340 } else if (type == UNIX_SOCKET) {
341 *pobject_type = DT_SOCK;
342 tmp_inode->i_mode |= S_IFSOCK;
343 } else {
344 /* safest to just call it a file */
345 *pobject_type = DT_REG;
346 tmp_inode->i_mode |= S_IFREG;
347 cFYI(1,("unknown inode type %d",type));
348 }
349
350 tmp_inode->i_uid = le64_to_cpu(pfindData->Uid);
351 tmp_inode->i_gid = le64_to_cpu(pfindData->Gid);
352 tmp_inode->i_nlink = le64_to_cpu(pfindData->Nlinks);
353
354 if (is_size_safe_to_change(cifsInfo)) {
355 /* can not safely change the file size here if the
356 client is writing to it due to potential races */
357 i_size_write(tmp_inode,end_of_file);
358
359 /* 512 bytes (2**9) is the fake blocksize that must be used */
360 /* for this calculation, not the real blocksize */
361 tmp_inode->i_blocks = (512 - 1 + num_of_bytes) >> 9;
362 }
363
364 if (S_ISREG(tmp_inode->i_mode)) {
365 cFYI(1, ("File inode"));
366 tmp_inode->i_op = &cifs_file_inode_ops;
367
368 if(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DIRECT_IO) {
369 if(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_BRL)
370 tmp_inode->i_fop = &cifs_file_direct_nobrl_ops;
371 else
372 tmp_inode->i_fop = &cifs_file_direct_ops;
373
374 } else if(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_BRL)
375 tmp_inode->i_fop = &cifs_file_nobrl_ops;
376 else
377 tmp_inode->i_fop = &cifs_file_ops;
378
379 if((cifs_sb->tcon) && (cifs_sb->tcon->ses) &&
380 (cifs_sb->tcon->ses->server->maxBuf <
381 PAGE_CACHE_SIZE + MAX_CIFS_HDR_SIZE))
382 tmp_inode->i_data.a_ops = &cifs_addr_ops_smallbuf;
383 else
384 tmp_inode->i_data.a_ops = &cifs_addr_ops;
385
386 if(isNewInode)
387 return; /* No sense invalidating pages for new inode since we
388 have not started caching readahead file data yet */
389
390 if (timespec_equal(&tmp_inode->i_mtime, &local_mtime) &&
391 (local_size == tmp_inode->i_size)) {
392 cFYI(1, ("inode exists but unchanged"));
393 } else {
394 /* file may have changed on server */
395 cFYI(1, ("invalidate inode, readdir detected change"));
396 invalidate_remote_inode(tmp_inode);
397 }
398 } else if (S_ISDIR(tmp_inode->i_mode)) {
399 cFYI(1, ("Directory inode"));
400 tmp_inode->i_op = &cifs_dir_inode_ops;
401 tmp_inode->i_fop = &cifs_dir_ops;
402 } else if (S_ISLNK(tmp_inode->i_mode)) {
403 cFYI(1, ("Symbolic Link inode"));
404 tmp_inode->i_op = &cifs_symlink_inode_ops;
405 /* tmp_inode->i_fop = *//* do not need to set to anything */
406 } else {
407 cFYI(1, ("Special inode"));
408 init_special_inode(tmp_inode, tmp_inode->i_mode,
409 tmp_inode->i_rdev);
410 }
411 }
412
413 static int initiate_cifs_search(const int xid, struct file *file)
414 {
415 int rc = 0;
416 char * full_path;
417 struct cifsFileInfo * cifsFile;
418 struct cifs_sb_info *cifs_sb;
419 struct cifsTconInfo *pTcon;
420
421 if(file->private_data == NULL) {
422 file->private_data =
423 kmalloc(sizeof(struct cifsFileInfo),GFP_KERNEL);
424 }
425
426 if(file->private_data == NULL) {
427 return -ENOMEM;
428 } else {
429 memset(file->private_data,0,sizeof(struct cifsFileInfo));
430 }
431 cifsFile = file->private_data;
432 cifsFile->invalidHandle = TRUE;
433 cifsFile->srch_inf.endOfSearch = FALSE;
434
435 if(file->f_path.dentry == NULL)
436 return -ENOENT;
437
438 cifs_sb = CIFS_SB(file->f_path.dentry->d_sb);
439 if(cifs_sb == NULL)
440 return -EINVAL;
441
442 pTcon = cifs_sb->tcon;
443 if(pTcon == NULL)
444 return -EINVAL;
445
446 full_path = build_path_from_dentry(file->f_path.dentry);
447
448 if(full_path == NULL) {
449 return -ENOMEM;
450 }
451
452 cFYI(1, ("Full path: %s start at: %lld", full_path, file->f_pos));
453
454 ffirst_retry:
455 /* test for Unix extensions */
456 if (pTcon->ses->capabilities & CAP_UNIX) {
457 cifsFile->srch_inf.info_level = SMB_FIND_FILE_UNIX;
458 } else if ((pTcon->ses->capabilities &
459 (CAP_NT_SMBS | CAP_NT_FIND)) == 0) {
460 cifsFile->srch_inf.info_level = SMB_FIND_FILE_INFO_STANDARD;
461 } else if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM) {
462 cifsFile->srch_inf.info_level = SMB_FIND_FILE_ID_FULL_DIR_INFO;
463 } else /* not srvinos - BB fixme add check for backlevel? */ {
464 cifsFile->srch_inf.info_level = SMB_FIND_FILE_DIRECTORY_INFO;
465 }
466
467 rc = CIFSFindFirst(xid, pTcon,full_path,cifs_sb->local_nls,
468 &cifsFile->netfid, &cifsFile->srch_inf,
469 cifs_sb->mnt_cifs_flags &
470 CIFS_MOUNT_MAP_SPECIAL_CHR, CIFS_DIR_SEP(cifs_sb));
471 if(rc == 0)
472 cifsFile->invalidHandle = FALSE;
473 if((rc == -EOPNOTSUPP) &&
474 (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM)) {
475 cifs_sb->mnt_cifs_flags &= ~CIFS_MOUNT_SERVER_INUM;
476 goto ffirst_retry;
477 }
478 kfree(full_path);
479 return rc;
480 }
481
482 /* return length of unicode string in bytes */
483 static int cifs_unicode_bytelen(char *str)
484 {
485 int len;
486 __le16 * ustr = (__le16 *)str;
487
488 for(len=0;len <= PATH_MAX;len++) {
489 if(ustr[len] == 0)
490 return len << 1;
491 }
492 cFYI(1,("Unicode string longer than PATH_MAX found"));
493 return len << 1;
494 }
495
496 static char *nxt_dir_entry(char *old_entry, char *end_of_smb, int level)
497 {
498 char * new_entry;
499 FILE_DIRECTORY_INFO * pDirInfo = (FILE_DIRECTORY_INFO *)old_entry;
500
501 if(level == SMB_FIND_FILE_INFO_STANDARD) {
502 FIND_FILE_STANDARD_INFO * pfData;
503 pfData = (FIND_FILE_STANDARD_INFO *)pDirInfo;
504
505 new_entry = old_entry + sizeof(FIND_FILE_STANDARD_INFO) +
506 pfData->FileNameLength;
507 } else
508 new_entry = old_entry + le32_to_cpu(pDirInfo->NextEntryOffset);
509 cFYI(1,("new entry %p old entry %p",new_entry,old_entry));
510 /* validate that new_entry is not past end of SMB */
511 if(new_entry >= end_of_smb) {
512 cERROR(1,
513 ("search entry %p began after end of SMB %p old entry %p",
514 new_entry, end_of_smb, old_entry));
515 return NULL;
516 } else if(((level == SMB_FIND_FILE_INFO_STANDARD) &&
517 (new_entry + sizeof(FIND_FILE_STANDARD_INFO) > end_of_smb)) ||
518 ((level != SMB_FIND_FILE_INFO_STANDARD) &&
519 (new_entry + sizeof(FILE_DIRECTORY_INFO) > end_of_smb))) {
520 cERROR(1,("search entry %p extends after end of SMB %p",
521 new_entry, end_of_smb));
522 return NULL;
523 } else
524 return new_entry;
525
526 }
527
528 #define UNICODE_DOT cpu_to_le16(0x2e)
529
530 /* return 0 if no match and 1 for . (current directory) and 2 for .. (parent) */
531 static int cifs_entry_is_dot(char *current_entry, struct cifsFileInfo *cfile)
532 {
533 int rc = 0;
534 char * filename = NULL;
535 int len = 0;
536
537 if(cfile->srch_inf.info_level == SMB_FIND_FILE_UNIX) {
538 FILE_UNIX_INFO * pFindData = (FILE_UNIX_INFO *)current_entry;
539 filename = &pFindData->FileName[0];
540 if(cfile->srch_inf.unicode) {
541 len = cifs_unicode_bytelen(filename);
542 } else {
543 /* BB should we make this strnlen of PATH_MAX? */
544 len = strnlen(filename, 5);
545 }
546 } else if(cfile->srch_inf.info_level == SMB_FIND_FILE_DIRECTORY_INFO) {
547 FILE_DIRECTORY_INFO * pFindData =
548 (FILE_DIRECTORY_INFO *)current_entry;
549 filename = &pFindData->FileName[0];
550 len = le32_to_cpu(pFindData->FileNameLength);
551 } else if(cfile->srch_inf.info_level ==
552 SMB_FIND_FILE_FULL_DIRECTORY_INFO) {
553 FILE_FULL_DIRECTORY_INFO * pFindData =
554 (FILE_FULL_DIRECTORY_INFO *)current_entry;
555 filename = &pFindData->FileName[0];
556 len = le32_to_cpu(pFindData->FileNameLength);
557 } else if(cfile->srch_inf.info_level ==
558 SMB_FIND_FILE_ID_FULL_DIR_INFO) {
559 SEARCH_ID_FULL_DIR_INFO * pFindData =
560 (SEARCH_ID_FULL_DIR_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_BOTH_DIRECTORY_INFO) {
565 FILE_BOTH_DIRECTORY_INFO * pFindData =
566 (FILE_BOTH_DIRECTORY_INFO *)current_entry;
567 filename = &pFindData->FileName[0];
568 len = le32_to_cpu(pFindData->FileNameLength);
569 } else if(cfile->srch_inf.info_level == SMB_FIND_FILE_INFO_STANDARD) {
570 FIND_FILE_STANDARD_INFO * pFindData =
571 (FIND_FILE_STANDARD_INFO *)current_entry;
572 filename = &pFindData->FileName[0];
573 len = pFindData->FileNameLength;
574 } else {
575 cFYI(1,("Unknown findfirst level %d",cfile->srch_inf.info_level));
576 }
577
578 if(filename) {
579 if(cfile->srch_inf.unicode) {
580 __le16 *ufilename = (__le16 *)filename;
581 if(len == 2) {
582 /* check for . */
583 if(ufilename[0] == UNICODE_DOT)
584 rc = 1;
585 } else if(len == 4) {
586 /* check for .. */
587 if((ufilename[0] == UNICODE_DOT)
588 &&(ufilename[1] == UNICODE_DOT))
589 rc = 2;
590 }
591 } else /* ASCII */ {
592 if(len == 1) {
593 if(filename[0] == '.')
594 rc = 1;
595 } else if(len == 2) {
596 if((filename[0] == '.') && (filename[1] == '.'))
597 rc = 2;
598 }
599 }
600 }
601
602 return rc;
603 }
604
605 /* Check if directory that we are searching has changed so we can decide
606 whether we can use the cached search results from the previous search */
607 static int is_dir_changed(struct file * file)
608 {
609 struct inode * inode;
610 struct cifsInodeInfo *cifsInfo;
611
612 if(file->f_path.dentry == NULL)
613 return 0;
614
615 inode = file->f_path.dentry->d_inode;
616
617 if(inode == NULL)
618 return 0;
619
620 cifsInfo = CIFS_I(inode);
621
622 if(cifsInfo->time == 0)
623 return 1; /* directory was changed, perhaps due to unlink */
624 else
625 return 0;
626
627 }
628
629 /* find the corresponding entry in the search */
630 /* Note that the SMB server returns search entries for . and .. which
631 complicates logic here if we choose to parse for them and we do not
632 assume that they are located in the findfirst return buffer.*/
633 /* We start counting in the buffer with entry 2 and increment for every
634 entry (do not increment for . or .. entry) */
635 static int find_cifs_entry(const int xid, struct cifsTconInfo *pTcon,
636 struct file *file, char **ppCurrentEntry, int *num_to_ret)
637 {
638 int rc = 0;
639 int pos_in_buf = 0;
640 loff_t first_entry_in_buffer;
641 loff_t index_to_find = file->f_pos;
642 struct cifsFileInfo * cifsFile = file->private_data;
643 /* check if index in the buffer */
644
645 if((cifsFile == NULL) || (ppCurrentEntry == NULL) ||
646 (num_to_ret == NULL))
647 return -ENOENT;
648
649 *ppCurrentEntry = NULL;
650 first_entry_in_buffer =
651 cifsFile->srch_inf.index_of_last_entry -
652 cifsFile->srch_inf.entries_in_buffer;
653
654 /* if first entry in buf is zero then is first buffer
655 in search response data which means it is likely . and ..
656 will be in this buffer, although some servers do not return
657 . and .. for the root of a drive and for those we need
658 to start two entries earlier */
659
660 #ifdef CONFIG_CIFS_DEBUG2
661 dump_cifs_file_struct(file, "In fce ");
662 #endif
663 if(((index_to_find < cifsFile->srch_inf.index_of_last_entry) &&
664 is_dir_changed(file)) ||
665 (index_to_find < first_entry_in_buffer)) {
666 /* close and restart search */
667 cFYI(1,("search backing up - close and restart search"));
668 cifsFile->invalidHandle = TRUE;
669 CIFSFindClose(xid, pTcon, cifsFile->netfid);
670 kfree(cifsFile->search_resume_name);
671 cifsFile->search_resume_name = NULL;
672 if(cifsFile->srch_inf.ntwrk_buf_start) {
673 cFYI(1,("freeing SMB ff cache buf on search rewind"));
674 if(cifsFile->srch_inf.smallBuf)
675 cifs_small_buf_release(cifsFile->srch_inf.
676 ntwrk_buf_start);
677 else
678 cifs_buf_release(cifsFile->srch_inf.
679 ntwrk_buf_start);
680 }
681 rc = initiate_cifs_search(xid,file);
682 if(rc) {
683 cFYI(1,("error %d reinitiating a search on rewind",rc));
684 return rc;
685 }
686 }
687
688 while((index_to_find >= cifsFile->srch_inf.index_of_last_entry) &&
689 (rc == 0) && (cifsFile->srch_inf.endOfSearch == FALSE)){
690 cFYI(1,("calling findnext2"));
691 rc = CIFSFindNext(xid,pTcon,cifsFile->netfid,
692 &cifsFile->srch_inf);
693 if(rc)
694 return -ENOENT;
695 }
696 if(index_to_find < cifsFile->srch_inf.index_of_last_entry) {
697 /* we found the buffer that contains the entry */
698 /* scan and find it */
699 int i;
700 char * current_entry;
701 char * end_of_smb = cifsFile->srch_inf.ntwrk_buf_start +
702 smbCalcSize((struct smb_hdr *)
703 cifsFile->srch_inf.ntwrk_buf_start);
704
705 current_entry = cifsFile->srch_inf.srch_entries_start;
706 first_entry_in_buffer = cifsFile->srch_inf.index_of_last_entry
707 - cifsFile->srch_inf.entries_in_buffer;
708 pos_in_buf = index_to_find - first_entry_in_buffer;
709 cFYI(1,("found entry - pos_in_buf %d",pos_in_buf));
710
711 for(i=0;(i<(pos_in_buf)) && (current_entry != NULL);i++) {
712 /* go entry by entry figuring out which is first */
713 current_entry = nxt_dir_entry(current_entry,end_of_smb,
714 cifsFile->srch_inf.info_level);
715 }
716 if((current_entry == NULL) && (i < pos_in_buf)) {
717 /* BB fixme - check if we should flag this error */
718 cERROR(1,("reached end of buf searching for pos in buf"
719 " %d index to find %lld rc %d",
720 pos_in_buf,index_to_find,rc));
721 }
722 rc = 0;
723 *ppCurrentEntry = current_entry;
724 } else {
725 cFYI(1,("index not in buffer - could not findnext into it"));
726 return 0;
727 }
728
729 if(pos_in_buf >= cifsFile->srch_inf.entries_in_buffer) {
730 cFYI(1,("can not return entries pos_in_buf beyond last entry"));
731 *num_to_ret = 0;
732 } else
733 *num_to_ret = cifsFile->srch_inf.entries_in_buffer - pos_in_buf;
734
735 return rc;
736 }
737
738 /* inode num, inode type and filename returned */
739 static int cifs_get_name_from_search_buf(struct qstr *pqst,
740 char *current_entry, __u16 level, unsigned int unicode,
741 struct cifs_sb_info * cifs_sb, int max_len, ino_t *pinum)
742 {
743 int rc = 0;
744 unsigned int len = 0;
745 char * filename;
746 struct nls_table * nlt = cifs_sb->local_nls;
747
748 *pinum = 0;
749
750 if(level == SMB_FIND_FILE_UNIX) {
751 FILE_UNIX_INFO * pFindData = (FILE_UNIX_INFO *)current_entry;
752
753 filename = &pFindData->FileName[0];
754 if(unicode) {
755 len = cifs_unicode_bytelen(filename);
756 } else {
757 /* BB should we make this strnlen of PATH_MAX? */
758 len = strnlen(filename, PATH_MAX);
759 }
760
761 /* BB fixme - hash low and high 32 bits if not 64 bit arch BB fixme */
762 if(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM)
763 *pinum = pFindData->UniqueId;
764 } else if(level == SMB_FIND_FILE_DIRECTORY_INFO) {
765 FILE_DIRECTORY_INFO * pFindData =
766 (FILE_DIRECTORY_INFO *)current_entry;
767 filename = &pFindData->FileName[0];
768 len = le32_to_cpu(pFindData->FileNameLength);
769 } else if(level == SMB_FIND_FILE_FULL_DIRECTORY_INFO) {
770 FILE_FULL_DIRECTORY_INFO * pFindData =
771 (FILE_FULL_DIRECTORY_INFO *)current_entry;
772 filename = &pFindData->FileName[0];
773 len = le32_to_cpu(pFindData->FileNameLength);
774 } else if(level == SMB_FIND_FILE_ID_FULL_DIR_INFO) {
775 SEARCH_ID_FULL_DIR_INFO * pFindData =
776 (SEARCH_ID_FULL_DIR_INFO *)current_entry;
777 filename = &pFindData->FileName[0];
778 len = le32_to_cpu(pFindData->FileNameLength);
779 *pinum = pFindData->UniqueId;
780 } else if(level == SMB_FIND_FILE_BOTH_DIRECTORY_INFO) {
781 FILE_BOTH_DIRECTORY_INFO * pFindData =
782 (FILE_BOTH_DIRECTORY_INFO *)current_entry;
783 filename = &pFindData->FileName[0];
784 len = le32_to_cpu(pFindData->FileNameLength);
785 } else if(level == SMB_FIND_FILE_INFO_STANDARD) {
786 FIND_FILE_STANDARD_INFO * pFindData =
787 (FIND_FILE_STANDARD_INFO *)current_entry;
788 filename = &pFindData->FileName[0];
789 /* one byte length, no name conversion */
790 len = (unsigned int)pFindData->FileNameLength;
791 } else {
792 cFYI(1,("Unknown findfirst level %d",level));
793 return -EINVAL;
794 }
795
796 if(len > max_len) {
797 cERROR(1,("bad search response length %d past smb end", len));
798 return -EINVAL;
799 }
800
801 if(unicode) {
802 /* BB fixme - test with long names */
803 /* Note converted filename can be longer than in unicode */
804 if(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR)
805 pqst->len = cifs_convertUCSpath((char *)pqst->name,
806 (__le16 *)filename, len/2, nlt);
807 else
808 pqst->len = cifs_strfromUCS_le((char *)pqst->name,
809 (__le16 *)filename,len/2,nlt);
810 } else {
811 pqst->name = filename;
812 pqst->len = len;
813 }
814 pqst->hash = full_name_hash(pqst->name,pqst->len);
815 /* cFYI(1,("filldir on %s",pqst->name)); */
816 return rc;
817 }
818
819 static int cifs_filldir(char *pfindEntry, struct file *file,
820 filldir_t filldir, void *direntry, char *scratch_buf, int max_len)
821 {
822 int rc = 0;
823 struct qstr qstring;
824 struct cifsFileInfo * pCifsF;
825 unsigned obj_type;
826 ino_t inum;
827 struct cifs_sb_info * cifs_sb;
828 struct inode *tmp_inode;
829 struct dentry *tmp_dentry;
830
831 /* get filename and len into qstring */
832 /* get dentry */
833 /* decide whether to create and populate ionde */
834 if((direntry == NULL) || (file == NULL))
835 return -EINVAL;
836
837 pCifsF = file->private_data;
838
839 if((scratch_buf == NULL) || (pfindEntry == NULL) || (pCifsF == NULL))
840 return -ENOENT;
841
842 if(file->f_path.dentry == NULL)
843 return -ENOENT;
844
845 rc = cifs_entry_is_dot(pfindEntry,pCifsF);
846 /* skip . and .. since we added them first */
847 if(rc != 0)
848 return 0;
849
850 cifs_sb = CIFS_SB(file->f_path.dentry->d_sb);
851
852 qstring.name = scratch_buf;
853 rc = cifs_get_name_from_search_buf(&qstring,pfindEntry,
854 pCifsF->srch_inf.info_level,
855 pCifsF->srch_inf.unicode,cifs_sb,
856 max_len,
857 &inum /* returned */);
858
859 if(rc)
860 return rc;
861
862 rc = construct_dentry(&qstring,file,&tmp_inode, &tmp_dentry);
863 if((tmp_inode == NULL) || (tmp_dentry == NULL))
864 return -ENOMEM;
865
866 if(rc) {
867 /* inode created, we need to hash it with right inode number */
868 if(inum != 0) {
869 /* BB fixme - hash the 2 32 quantities bits together if necessary BB */
870 tmp_inode->i_ino = inum;
871 }
872 insert_inode_hash(tmp_inode);
873 }
874
875 /* we pass in rc below, indicating whether it is a new inode,
876 so we can figure out whether to invalidate the inode cached
877 data if the file has changed */
878 if(pCifsF->srch_inf.info_level == SMB_FIND_FILE_UNIX)
879 unix_fill_in_inode(tmp_inode,
880 (FILE_UNIX_INFO *)pfindEntry,
881 &obj_type, rc);
882 else if(pCifsF->srch_inf.info_level == SMB_FIND_FILE_INFO_STANDARD)
883 fill_in_inode(tmp_inode, 0 /* old level 1 buffer type */,
884 pfindEntry, &obj_type, rc);
885 else
886 fill_in_inode(tmp_inode, 1 /* NT */, pfindEntry, &obj_type, rc);
887
888 if(rc) /* new inode - needs to be tied to dentry */ {
889 d_instantiate(tmp_dentry, tmp_inode);
890 if(rc == 2)
891 d_rehash(tmp_dentry);
892 }
893
894
895 rc = filldir(direntry,qstring.name,qstring.len,file->f_pos,
896 tmp_inode->i_ino,obj_type);
897 if(rc) {
898 cFYI(1,("filldir rc = %d",rc));
899 /* we can not return filldir errors to the caller
900 since they are "normal" when the stat blocksize
901 is too small - we return remapped error instead */
902 rc = -EOVERFLOW;
903 }
904
905 dput(tmp_dentry);
906 return rc;
907 }
908
909 static int cifs_save_resume_key(const char *current_entry,
910 struct cifsFileInfo *cifsFile)
911 {
912 int rc = 0;
913 unsigned int len = 0;
914 __u16 level;
915 char * filename;
916
917 if((cifsFile == NULL) || (current_entry == NULL))
918 return -EINVAL;
919
920 level = cifsFile->srch_inf.info_level;
921
922 if(level == SMB_FIND_FILE_UNIX) {
923 FILE_UNIX_INFO * pFindData = (FILE_UNIX_INFO *)current_entry;
924
925 filename = &pFindData->FileName[0];
926 if(cifsFile->srch_inf.unicode) {
927 len = cifs_unicode_bytelen(filename);
928 } else {
929 /* BB should we make this strnlen of PATH_MAX? */
930 len = strnlen(filename, PATH_MAX);
931 }
932 cifsFile->srch_inf.resume_key = pFindData->ResumeKey;
933 } else if(level == SMB_FIND_FILE_DIRECTORY_INFO) {
934 FILE_DIRECTORY_INFO * pFindData =
935 (FILE_DIRECTORY_INFO *)current_entry;
936 filename = &pFindData->FileName[0];
937 len = le32_to_cpu(pFindData->FileNameLength);
938 cifsFile->srch_inf.resume_key = pFindData->FileIndex;
939 } else if(level == SMB_FIND_FILE_FULL_DIRECTORY_INFO) {
940 FILE_FULL_DIRECTORY_INFO * pFindData =
941 (FILE_FULL_DIRECTORY_INFO *)current_entry;
942 filename = &pFindData->FileName[0];
943 len = le32_to_cpu(pFindData->FileNameLength);
944 cifsFile->srch_inf.resume_key = pFindData->FileIndex;
945 } else if(level == SMB_FIND_FILE_ID_FULL_DIR_INFO) {
946 SEARCH_ID_FULL_DIR_INFO * pFindData =
947 (SEARCH_ID_FULL_DIR_INFO *)current_entry;
948 filename = &pFindData->FileName[0];
949 len = le32_to_cpu(pFindData->FileNameLength);
950 cifsFile->srch_inf.resume_key = pFindData->FileIndex;
951 } else if(level == SMB_FIND_FILE_BOTH_DIRECTORY_INFO) {
952 FILE_BOTH_DIRECTORY_INFO * pFindData =
953 (FILE_BOTH_DIRECTORY_INFO *)current_entry;
954 filename = &pFindData->FileName[0];
955 len = le32_to_cpu(pFindData->FileNameLength);
956 cifsFile->srch_inf.resume_key = pFindData->FileIndex;
957 } else if(level == SMB_FIND_FILE_INFO_STANDARD) {
958 FIND_FILE_STANDARD_INFO * pFindData =
959 (FIND_FILE_STANDARD_INFO *)current_entry;
960 filename = &pFindData->FileName[0];
961 /* one byte length, no name conversion */
962 len = (unsigned int)pFindData->FileNameLength;
963 cifsFile->srch_inf.resume_key = pFindData->ResumeKey;
964 } else {
965 cFYI(1,("Unknown findfirst level %d",level));
966 return -EINVAL;
967 }
968 cifsFile->srch_inf.resume_name_len = len;
969 cifsFile->srch_inf.presume_name = filename;
970 return rc;
971 }
972
973 int cifs_readdir(struct file *file, void *direntry, filldir_t filldir)
974 {
975 int rc = 0;
976 int xid,i;
977 struct cifs_sb_info *cifs_sb;
978 struct cifsTconInfo *pTcon;
979 struct cifsFileInfo *cifsFile = NULL;
980 char * current_entry;
981 int num_to_fill = 0;
982 char * tmp_buf = NULL;
983 char * end_of_smb;
984 int max_len;
985
986 xid = GetXid();
987
988 if(file->f_path.dentry == NULL) {
989 FreeXid(xid);
990 return -EIO;
991 }
992
993 cifs_sb = CIFS_SB(file->f_path.dentry->d_sb);
994 pTcon = cifs_sb->tcon;
995 if(pTcon == NULL)
996 return -EINVAL;
997
998 switch ((int) file->f_pos) {
999 case 0:
1000 if (filldir(direntry, ".", 1, file->f_pos,
1001 file->f_path.dentry->d_inode->i_ino, DT_DIR) < 0) {
1002 cERROR(1, ("Filldir for current dir failed"));
1003 rc = -ENOMEM;
1004 break;
1005 }
1006 file->f_pos++;
1007 case 1:
1008 if (filldir(direntry, "..", 2, file->f_pos,
1009 file->f_path.dentry->d_parent->d_inode->i_ino, DT_DIR) < 0) {
1010 cERROR(1, ("Filldir for parent dir failed"));
1011 rc = -ENOMEM;
1012 break;
1013 }
1014 file->f_pos++;
1015 default:
1016 /* 1) If search is active,
1017 is in current search buffer?
1018 if it before then restart search
1019 if after then keep searching till find it */
1020
1021 if(file->private_data == NULL) {
1022 rc = initiate_cifs_search(xid,file);
1023 cFYI(1,("initiate cifs search rc %d",rc));
1024 if(rc) {
1025 FreeXid(xid);
1026 return rc;
1027 }
1028 }
1029 if(file->private_data == NULL) {
1030 rc = -EINVAL;
1031 FreeXid(xid);
1032 return rc;
1033 }
1034 cifsFile = file->private_data;
1035 if (cifsFile->srch_inf.endOfSearch) {
1036 if(cifsFile->srch_inf.emptyDir) {
1037 cFYI(1, ("End of search, empty dir"));
1038 rc = 0;
1039 break;
1040 }
1041 } /* else {
1042 cifsFile->invalidHandle = TRUE;
1043 CIFSFindClose(xid, pTcon, cifsFile->netfid);
1044 }
1045 kfree(cifsFile->search_resume_name);
1046 cifsFile->search_resume_name = NULL; */
1047
1048 rc = find_cifs_entry(xid,pTcon, file,
1049 &current_entry,&num_to_fill);
1050 if(rc) {
1051 cFYI(1,("fce error %d",rc));
1052 goto rddir2_exit;
1053 } else if (current_entry != NULL) {
1054 cFYI(1,("entry %lld found",file->f_pos));
1055 } else {
1056 cFYI(1,("could not find entry"));
1057 goto rddir2_exit;
1058 }
1059 cFYI(1,("loop through %d times filling dir for net buf %p",
1060 num_to_fill,cifsFile->srch_inf.ntwrk_buf_start));
1061 max_len = smbCalcSize((struct smb_hdr *)
1062 cifsFile->srch_inf.ntwrk_buf_start);
1063 end_of_smb = cifsFile->srch_inf.ntwrk_buf_start + max_len;
1064
1065 /* To be safe - for UCS to UTF-8 with strings loaded
1066 with the rare long characters alloc more to account for
1067 such multibyte target UTF-8 characters. cifs_unicode.c,
1068 which actually does the conversion, has the same limit */
1069 tmp_buf = kmalloc((2 * NAME_MAX) + 4, GFP_KERNEL);
1070 for(i=0;(i<num_to_fill) && (rc == 0);i++) {
1071 if(current_entry == NULL) {
1072 /* evaluate whether this case is an error */
1073 cERROR(1,("past end of SMB num to fill %d i %d",
1074 num_to_fill, i));
1075 break;
1076 }
1077 /* if buggy server returns . and .. late do
1078 we want to check for that here? */
1079 rc = cifs_filldir(current_entry, file,
1080 filldir, direntry, tmp_buf, max_len);
1081 if(rc == -EOVERFLOW) {
1082 rc = 0;
1083 break;
1084 }
1085
1086 file->f_pos++;
1087 if(file->f_pos ==
1088 cifsFile->srch_inf.index_of_last_entry) {
1089 cFYI(1,("last entry in buf at pos %lld %s",
1090 file->f_pos,tmp_buf));
1091 cifs_save_resume_key(current_entry,cifsFile);
1092 break;
1093 } else
1094 current_entry =
1095 nxt_dir_entry(current_entry, end_of_smb,
1096 cifsFile->srch_inf.info_level);
1097 }
1098 kfree(tmp_buf);
1099 break;
1100 } /* end switch */
1101
1102 rddir2_exit:
1103 FreeXid(xid);
1104 return rc;
1105 }
Linux 2.6 ibm-acpi/thinkpad-acpi driver git tree