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KVM: VMX: Only save/restore MSR_K6_STAR if necessary
[firewire-audio.git] / fs / cifs / readdir.c
blob2a374d5215ab99c579ad67da11c1b6b2776462c3
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 <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 if(file->f_path.dentry->d_sb->s_flags & MS_NOATIME)
87 (*ptmp_inode)->i_flags |= S_NOATIME | S_NOCMTIME;
88 } else {
89 tmp_dentry = d_alloc(file->f_path.dentry, qstring);
90 if(tmp_dentry == NULL) {
91 cERROR(1,("Failed allocating dentry"));
92 *ptmp_inode = NULL;
93 return rc;
94 }
95
96 *ptmp_inode = new_inode(file->f_path.dentry->d_sb);
97 if (pTcon->nocase)
98 tmp_dentry->d_op = &cifs_ci_dentry_ops;
99 else
100 tmp_dentry->d_op = &cifs_dentry_ops;
101 if(*ptmp_inode == NULL)
102 return rc;
103 if(file->f_path.dentry->d_sb->s_flags & MS_NOATIME)
104 (*ptmp_inode)->i_flags |= S_NOATIME | S_NOCMTIME;
105 rc = 2;
106 }
107
108 tmp_dentry->d_time = jiffies;
109 *pnew_dentry = tmp_dentry;
110 return rc;
111 }
112
113 static void AdjustForTZ(struct cifsTconInfo * tcon, struct inode * inode)
114 {
115 if((tcon) && (tcon->ses) && (tcon->ses->server)) {
116 inode->i_ctime.tv_sec += tcon->ses->server->timeAdj;
117 inode->i_mtime.tv_sec += tcon->ses->server->timeAdj;
118 inode->i_atime.tv_sec += tcon->ses->server->timeAdj;
119 }
120 return;
121 }
122
123
124 static void fill_in_inode(struct inode *tmp_inode, int new_buf_type,
125 char * buf, int *pobject_type, int isNewInode)
126 {
127 loff_t local_size;
128 struct timespec local_mtime;
129
130 struct cifsInodeInfo *cifsInfo = CIFS_I(tmp_inode);
131 struct cifs_sb_info *cifs_sb = CIFS_SB(tmp_inode->i_sb);
132 __u32 attr;
133 __u64 allocation_size;
134 __u64 end_of_file;
135
136 /* save mtime and size */
137 local_mtime = tmp_inode->i_mtime;
138 local_size = tmp_inode->i_size;
139
140 if(new_buf_type) {
141 FILE_DIRECTORY_INFO *pfindData = (FILE_DIRECTORY_INFO *)buf;
142
143 attr = le32_to_cpu(pfindData->ExtFileAttributes);
144 allocation_size = le64_to_cpu(pfindData->AllocationSize);
145 end_of_file = le64_to_cpu(pfindData->EndOfFile);
146 tmp_inode->i_atime =
147 cifs_NTtimeToUnix(le64_to_cpu(pfindData->LastAccessTime));
148 tmp_inode->i_mtime =
149 cifs_NTtimeToUnix(le64_to_cpu(pfindData->LastWriteTime));
150 tmp_inode->i_ctime =
151 cifs_NTtimeToUnix(le64_to_cpu(pfindData->ChangeTime));
152 } else { /* legacy, OS2 and DOS style */
153 /* struct timespec ts;*/
154 FIND_FILE_STANDARD_INFO * pfindData =
155 (FIND_FILE_STANDARD_INFO *)buf;
156
157 tmp_inode->i_mtime = cnvrtDosUnixTm(
158 le16_to_cpu(pfindData->LastWriteDate),
159 le16_to_cpu(pfindData->LastWriteTime));
160 tmp_inode->i_atime = cnvrtDosUnixTm(
161 le16_to_cpu(pfindData->LastAccessDate),
162 le16_to_cpu(pfindData->LastAccessTime));
163 tmp_inode->i_ctime = cnvrtDosUnixTm(
164 le16_to_cpu(pfindData->LastWriteDate),
165 le16_to_cpu(pfindData->LastWriteTime));
166 AdjustForTZ(cifs_sb->tcon, tmp_inode);
167 attr = le16_to_cpu(pfindData->Attributes);
168 allocation_size = le32_to_cpu(pfindData->AllocationSize);
169 end_of_file = le32_to_cpu(pfindData->DataSize);
170 }
171
172 /* Linux can not store file creation time unfortunately so ignore it */
173
174 cifsInfo->cifsAttrs = attr;
175 cifsInfo->time = jiffies;
176
177 /* treat dos attribute of read-only as read-only mode bit e.g. 555? */
178 /* 2767 perms - indicate mandatory locking */
179 /* BB fill in uid and gid here? with help from winbind?
180 or retrieve from NTFS stream extended attribute */
181 if (atomic_read(&cifsInfo->inUse) == 0) {
182 tmp_inode->i_uid = cifs_sb->mnt_uid;
183 tmp_inode->i_gid = cifs_sb->mnt_gid;
184 /* set default mode. will override for dirs below */
185 tmp_inode->i_mode = cifs_sb->mnt_file_mode;
186 } else {
187 /* mask off the type bits since it gets set
188 below and we do not want to get two type
189 bits set */
190 tmp_inode->i_mode &= ~S_IFMT;
191 }
192
193 if (attr & ATTR_DIRECTORY) {
194 *pobject_type = DT_DIR;
195 /* override default perms since we do not lock dirs */
196 if(atomic_read(&cifsInfo->inUse) == 0) {
197 tmp_inode->i_mode = cifs_sb->mnt_dir_mode;
198 }
199 tmp_inode->i_mode |= S_IFDIR;
200 } else if ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_UNX_EMUL) &&
201 (attr & ATTR_SYSTEM)) {
202 if (end_of_file == 0) {
203 *pobject_type = DT_FIFO;
204 tmp_inode->i_mode |= S_IFIFO;
205 } else {
206 /* rather than get the type here, we mark the
207 inode as needing revalidate and get the real type
208 (blk vs chr vs. symlink) later ie in lookup */
209 *pobject_type = DT_REG;
210 tmp_inode->i_mode |= S_IFREG;
211 cifsInfo->time = 0;
212 }
213 /* we no longer mark these because we could not follow them */
214 /* } else if (attr & ATTR_REPARSE) {
215 *pobject_type = DT_LNK;
216 tmp_inode->i_mode |= S_IFLNK; */
217 } else {
218 *pobject_type = DT_REG;
219 tmp_inode->i_mode |= S_IFREG;
220 if (attr & ATTR_READONLY)
221 tmp_inode->i_mode &= ~(S_IWUGO);
222 else if ((tmp_inode->i_mode & S_IWUGO) == 0)
223 /* the ATTR_READONLY flag may have been changed on */
224 /* server -- set any w bits allowed by mnt_file_mode */
225 tmp_inode->i_mode |= (S_IWUGO & cifs_sb->mnt_file_mode);
226 } /* could add code here - to validate if device or weird share type? */
227
228 /* can not fill in nlink here as in qpathinfo version and Unx search */
229 if (atomic_read(&cifsInfo->inUse) == 0) {
230 atomic_set(&cifsInfo->inUse, 1);
231 }
232
233 spin_lock(&tmp_inode->i_lock);
234 if (is_size_safe_to_change(cifsInfo, end_of_file)) {
235 /* can not safely change the file size here if the
236 client is writing to it due to potential races */
237 i_size_write(tmp_inode, end_of_file);
238
239 /* 512 bytes (2**9) is the fake blocksize that must be used */
240 /* for this calculation, even though the reported blocksize is larger */
241 tmp_inode->i_blocks = (512 - 1 + allocation_size) >> 9;
242 }
243 spin_unlock(&tmp_inode->i_lock);
244
245 if (allocation_size < end_of_file)
246 cFYI(1, ("May be sparse file, allocation less than file size"));
247 cFYI(1, ("File Size %ld and blocks %llu",
248 (unsigned long)tmp_inode->i_size,
249 (unsigned long long)tmp_inode->i_blocks));
250 if (S_ISREG(tmp_inode->i_mode)) {
251 cFYI(1, ("File inode"));
252 tmp_inode->i_op = &cifs_file_inode_ops;
253 if(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DIRECT_IO) {
254 if(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_BRL)
255 tmp_inode->i_fop = &cifs_file_direct_nobrl_ops;
256 else
257 tmp_inode->i_fop = &cifs_file_direct_ops;
258
259 } else if(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_BRL)
260 tmp_inode->i_fop = &cifs_file_nobrl_ops;
261 else
262 tmp_inode->i_fop = &cifs_file_ops;
263
264 if((cifs_sb->tcon) && (cifs_sb->tcon->ses) &&
265 (cifs_sb->tcon->ses->server->maxBuf <
266 PAGE_CACHE_SIZE + MAX_CIFS_HDR_SIZE))
267 tmp_inode->i_data.a_ops = &cifs_addr_ops_smallbuf;
268 else
269 tmp_inode->i_data.a_ops = &cifs_addr_ops;
270
271 if(isNewInode)
272 return; /* No sense invalidating pages for new inode
273 since have not started caching readahead file
274 data yet */
275
276 if (timespec_equal(&tmp_inode->i_mtime, &local_mtime) &&
277 (local_size == tmp_inode->i_size)) {
278 cFYI(1, ("inode exists but unchanged"));
279 } else {
280 /* file may have changed on server */
281 cFYI(1, ("invalidate inode, readdir detected change"));
282 invalidate_remote_inode(tmp_inode);
283 }
284 } else if (S_ISDIR(tmp_inode->i_mode)) {
285 cFYI(1, ("Directory inode"));
286 tmp_inode->i_op = &cifs_dir_inode_ops;
287 tmp_inode->i_fop = &cifs_dir_ops;
288 } else if (S_ISLNK(tmp_inode->i_mode)) {
289 cFYI(1, ("Symbolic Link inode"));
290 tmp_inode->i_op = &cifs_symlink_inode_ops;
291 } else {
292 cFYI(1, ("Init special inode"));
293 init_special_inode(tmp_inode, tmp_inode->i_mode,
294 tmp_inode->i_rdev);
295 }
296 }
297
298 static void unix_fill_in_inode(struct inode *tmp_inode,
299 FILE_UNIX_INFO *pfindData, int *pobject_type, int isNewInode)
300 {
301 loff_t local_size;
302 struct timespec local_mtime;
303
304 struct cifsInodeInfo *cifsInfo = CIFS_I(tmp_inode);
305 struct cifs_sb_info *cifs_sb = CIFS_SB(tmp_inode->i_sb);
306
307 __u32 type = le32_to_cpu(pfindData->Type);
308 __u64 num_of_bytes = le64_to_cpu(pfindData->NumOfBytes);
309 __u64 end_of_file = le64_to_cpu(pfindData->EndOfFile);
310 cifsInfo->time = jiffies;
311 atomic_inc(&cifsInfo->inUse);
312
313 /* save mtime and size */
314 local_mtime = tmp_inode->i_mtime;
315 local_size = tmp_inode->i_size;
316
317 tmp_inode->i_atime =
318 cifs_NTtimeToUnix(le64_to_cpu(pfindData->LastAccessTime));
319 tmp_inode->i_mtime =
320 cifs_NTtimeToUnix(le64_to_cpu(pfindData->LastModificationTime));
321 tmp_inode->i_ctime =
322 cifs_NTtimeToUnix(le64_to_cpu(pfindData->LastStatusChange));
323
324 tmp_inode->i_mode = le64_to_cpu(pfindData->Permissions);
325 /* since we set the inode type below we need to mask off type
326 to avoid strange results if bits above were corrupt */
327 tmp_inode->i_mode &= ~S_IFMT;
328 if (type == UNIX_FILE) {
329 *pobject_type = DT_REG;
330 tmp_inode->i_mode |= S_IFREG;
331 } else if (type == UNIX_SYMLINK) {
332 *pobject_type = DT_LNK;
333 tmp_inode->i_mode |= S_IFLNK;
334 } else if (type == UNIX_DIR) {
335 *pobject_type = DT_DIR;
336 tmp_inode->i_mode |= S_IFDIR;
337 } else if (type == UNIX_CHARDEV) {
338 *pobject_type = DT_CHR;
339 tmp_inode->i_mode |= S_IFCHR;
340 tmp_inode->i_rdev = MKDEV(le64_to_cpu(pfindData->DevMajor),
341 le64_to_cpu(pfindData->DevMinor) & MINORMASK);
342 } else if (type == UNIX_BLOCKDEV) {
343 *pobject_type = DT_BLK;
344 tmp_inode->i_mode |= S_IFBLK;
345 tmp_inode->i_rdev = MKDEV(le64_to_cpu(pfindData->DevMajor),
346 le64_to_cpu(pfindData->DevMinor) & MINORMASK);
347 } else if (type == UNIX_FIFO) {
348 *pobject_type = DT_FIFO;
349 tmp_inode->i_mode |= S_IFIFO;
350 } else if (type == UNIX_SOCKET) {
351 *pobject_type = DT_SOCK;
352 tmp_inode->i_mode |= S_IFSOCK;
353 } else {
354 /* safest to just call it a file */
355 *pobject_type = DT_REG;
356 tmp_inode->i_mode |= S_IFREG;
357 cFYI(1,("unknown inode type %d",type));
358 }
359
360 tmp_inode->i_uid = le64_to_cpu(pfindData->Uid);
361 tmp_inode->i_gid = le64_to_cpu(pfindData->Gid);
362 tmp_inode->i_nlink = le64_to_cpu(pfindData->Nlinks);
363
364 spin_lock(&tmp_inode->i_lock);
365 if (is_size_safe_to_change(cifsInfo, end_of_file)) {
366 /* can not safely change the file size here if the
367 client is writing to it due to potential races */
368 i_size_write(tmp_inode, end_of_file);
369
370 /* 512 bytes (2**9) is the fake blocksize that must be used */
371 /* for this calculation, not the real blocksize */
372 tmp_inode->i_blocks = (512 - 1 + num_of_bytes) >> 9;
373 }
374 spin_unlock(&tmp_inode->i_lock);
375
376 if (S_ISREG(tmp_inode->i_mode)) {
377 cFYI(1, ("File inode"));
378 tmp_inode->i_op = &cifs_file_inode_ops;
379
380 if(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DIRECT_IO) {
381 if(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_BRL)
382 tmp_inode->i_fop = &cifs_file_direct_nobrl_ops;
383 else
384 tmp_inode->i_fop = &cifs_file_direct_ops;
385
386 } else if(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_BRL)
387 tmp_inode->i_fop = &cifs_file_nobrl_ops;
388 else
389 tmp_inode->i_fop = &cifs_file_ops;
390
391 if((cifs_sb->tcon) && (cifs_sb->tcon->ses) &&
392 (cifs_sb->tcon->ses->server->maxBuf <
393 PAGE_CACHE_SIZE + MAX_CIFS_HDR_SIZE))
394 tmp_inode->i_data.a_ops = &cifs_addr_ops_smallbuf;
395 else
396 tmp_inode->i_data.a_ops = &cifs_addr_ops;
397
398 if(isNewInode)
399 return; /* No sense invalidating pages for new inode since we
400 have not started caching readahead file data yet */
401
402 if (timespec_equal(&tmp_inode->i_mtime, &local_mtime) &&
403 (local_size == tmp_inode->i_size)) {
404 cFYI(1, ("inode exists but unchanged"));
405 } else {
406 /* file may have changed on server */
407 cFYI(1, ("invalidate inode, readdir detected change"));
408 invalidate_remote_inode(tmp_inode);
409 }
410 } else if (S_ISDIR(tmp_inode->i_mode)) {
411 cFYI(1, ("Directory inode"));
412 tmp_inode->i_op = &cifs_dir_inode_ops;
413 tmp_inode->i_fop = &cifs_dir_ops;
414 } else if (S_ISLNK(tmp_inode->i_mode)) {
415 cFYI(1, ("Symbolic Link inode"));
416 tmp_inode->i_op = &cifs_symlink_inode_ops;
417 /* tmp_inode->i_fop = *//* do not need to set to anything */
418 } else {
419 cFYI(1, ("Special inode"));
420 init_special_inode(tmp_inode, tmp_inode->i_mode,
421 tmp_inode->i_rdev);
422 }
423 }
424
425 static int initiate_cifs_search(const int xid, struct file *file)
426 {
427 int rc = 0;
428 char * full_path;
429 struct cifsFileInfo * cifsFile;
430 struct cifs_sb_info *cifs_sb;
431 struct cifsTconInfo *pTcon;
432
433 if(file->private_data == NULL) {
434 file->private_data =
435 kmalloc(sizeof(struct cifsFileInfo),GFP_KERNEL);
436 }
437
438 if(file->private_data == NULL) {
439 return -ENOMEM;
440 } else {
441 memset(file->private_data,0,sizeof(struct cifsFileInfo));
442 }
443 cifsFile = file->private_data;
444 cifsFile->invalidHandle = TRUE;
445 cifsFile->srch_inf.endOfSearch = FALSE;
446
447 if(file->f_path.dentry == NULL)
448 return -ENOENT;
449
450 cifs_sb = CIFS_SB(file->f_path.dentry->d_sb);
451 if(cifs_sb == NULL)
452 return -EINVAL;
453
454 pTcon = cifs_sb->tcon;
455 if(pTcon == NULL)
456 return -EINVAL;
457
458 full_path = build_path_from_dentry(file->f_path.dentry);
459
460 if(full_path == NULL) {
461 return -ENOMEM;
462 }
463
464 cFYI(1, ("Full path: %s start at: %lld", full_path, file->f_pos));
465
466 ffirst_retry:
467 /* test for Unix extensions */
468 if (pTcon->ses->capabilities & CAP_UNIX) {
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",cfile->srch_inf.info_level));
588 }
589
590 if(filename) {
591 if(cfile->srch_inf.unicode) {
592 __le16 *ufilename = (__le16 *)filename;
593 if(len == 2) {
594 /* check for . */
595 if(ufilename[0] == UNICODE_DOT)
596 rc = 1;
597 } else if(len == 4) {
598 /* check for .. */
599 if((ufilename[0] == UNICODE_DOT)
600 &&(ufilename[1] == UNICODE_DOT))
601 rc = 2;
602 }
603 } else /* ASCII */ {
604 if(len == 1) {
605 if(filename[0] == '.')
606 rc = 1;
607 } else if(len == 2) {
608 if((filename[0] == '.') && (filename[1] == '.'))
609 rc = 2;
610 }
611 }
612 }
613
614 return rc;
615 }
616
617 /* Check if directory that we are searching has changed so we can decide
618 whether we can use the cached search results from the previous search */
619 static int is_dir_changed(struct file * file)
620 {
621 struct inode * inode;
622 struct cifsInodeInfo *cifsInfo;
623
624 if(file->f_path.dentry == NULL)
625 return 0;
626
627 inode = file->f_path.dentry->d_inode;
628
629 if(inode == NULL)
630 return 0;
631
632 cifsInfo = CIFS_I(inode);
633
634 if(cifsInfo->time == 0)
635 return 1; /* directory was changed, perhaps due to unlink */
636 else
637 return 0;
638
639 }
640
641 /* find the corresponding entry in the search */
642 /* Note that the SMB server returns search entries for . and .. which
643 complicates logic here if we choose to parse for them and we do not
644 assume that they are located in the findfirst return buffer.*/
645 /* We start counting in the buffer with entry 2 and increment for every
646 entry (do not increment for . or .. entry) */
647 static int find_cifs_entry(const int xid, struct cifsTconInfo *pTcon,
648 struct file *file, char **ppCurrentEntry, int *num_to_ret)
649 {
650 int rc = 0;
651 int pos_in_buf = 0;
652 loff_t first_entry_in_buffer;
653 loff_t index_to_find = file->f_pos;
654 struct cifsFileInfo * cifsFile = file->private_data;
655 /* check if index in the buffer */
656
657 if((cifsFile == NULL) || (ppCurrentEntry == NULL) ||
658 (num_to_ret == NULL))
659 return -ENOENT;
660
661 *ppCurrentEntry = NULL;
662 first_entry_in_buffer =
663 cifsFile->srch_inf.index_of_last_entry -
664 cifsFile->srch_inf.entries_in_buffer;
665
666 /* if first entry in buf is zero then is first buffer
667 in search response data which means it is likely . and ..
668 will be in this buffer, although some servers do not return
669 . and .. for the root of a drive and for those we need
670 to start two entries earlier */
671
672 #ifdef CONFIG_CIFS_DEBUG2
673 dump_cifs_file_struct(file, "In fce ");
674 #endif
675 if(((index_to_find < cifsFile->srch_inf.index_of_last_entry) &&
676 is_dir_changed(file)) ||
677 (index_to_find < first_entry_in_buffer)) {
678 /* close and restart search */
679 cFYI(1,("search backing up - close and restart search"));
680 cifsFile->invalidHandle = TRUE;
681 CIFSFindClose(xid, pTcon, cifsFile->netfid);
682 kfree(cifsFile->search_resume_name);
683 cifsFile->search_resume_name = NULL;
684 if(cifsFile->srch_inf.ntwrk_buf_start) {
685 cFYI(1,("freeing SMB ff cache buf on search rewind"));
686 if(cifsFile->srch_inf.smallBuf)
687 cifs_small_buf_release(cifsFile->srch_inf.
688 ntwrk_buf_start);
689 else
690 cifs_buf_release(cifsFile->srch_inf.
691 ntwrk_buf_start);
692 }
693 rc = initiate_cifs_search(xid,file);
694 if(rc) {
695 cFYI(1,("error %d reinitiating a search on rewind",rc));
696 return rc;
697 }
698 }
699
700 while((index_to_find >= cifsFile->srch_inf.index_of_last_entry) &&
701 (rc == 0) && (cifsFile->srch_inf.endOfSearch == FALSE)){
702 cFYI(1,("calling findnext2"));
703 rc = CIFSFindNext(xid,pTcon,cifsFile->netfid,
704 &cifsFile->srch_inf);
705 if(rc)
706 return -ENOENT;
707 }
708 if(index_to_find < cifsFile->srch_inf.index_of_last_entry) {
709 /* we found the buffer that contains the entry */
710 /* scan and find it */
711 int i;
712 char * current_entry;
713 char * end_of_smb = cifsFile->srch_inf.ntwrk_buf_start +
714 smbCalcSize((struct smb_hdr *)
715 cifsFile->srch_inf.ntwrk_buf_start);
716
717 current_entry = cifsFile->srch_inf.srch_entries_start;
718 first_entry_in_buffer = cifsFile->srch_inf.index_of_last_entry
719 - cifsFile->srch_inf.entries_in_buffer;
720 pos_in_buf = index_to_find - first_entry_in_buffer;
721 cFYI(1,("found entry - pos_in_buf %d",pos_in_buf));
722
723 for(i=0;(i<(pos_in_buf)) && (current_entry != NULL);i++) {
724 /* go entry by entry figuring out which is first */
725 current_entry = nxt_dir_entry(current_entry,end_of_smb,
726 cifsFile->srch_inf.info_level);
727 }
728 if((current_entry == NULL) && (i < pos_in_buf)) {
729 /* BB fixme - check if we should flag this error */
730 cERROR(1,("reached end of buf searching for pos in buf"
731 " %d index to find %lld rc %d",
732 pos_in_buf,index_to_find,rc));
733 }
734 rc = 0;
735 *ppCurrentEntry = current_entry;
736 } else {
737 cFYI(1,("index not in buffer - could not findnext into it"));
738 return 0;
739 }
740
741 if(pos_in_buf >= cifsFile->srch_inf.entries_in_buffer) {
742 cFYI(1,("can not return entries pos_in_buf beyond last entry"));
743 *num_to_ret = 0;
744 } else
745 *num_to_ret = cifsFile->srch_inf.entries_in_buffer - pos_in_buf;
746
747 return rc;
748 }
749
750 /* inode num, inode type and filename returned */
751 static int cifs_get_name_from_search_buf(struct qstr *pqst,
752 char *current_entry, __u16 level, unsigned int unicode,
753 struct cifs_sb_info * cifs_sb, int max_len, ino_t *pinum)
754 {
755 int rc = 0;
756 unsigned int len = 0;
757 char * filename;
758 struct nls_table * nlt = cifs_sb->local_nls;
759
760 *pinum = 0;
761
762 if(level == SMB_FIND_FILE_UNIX) {
763 FILE_UNIX_INFO * pFindData = (FILE_UNIX_INFO *)current_entry;
764
765 filename = &pFindData->FileName[0];
766 if(unicode) {
767 len = cifs_unicode_bytelen(filename);
768 } else {
769 /* BB should we make this strnlen of PATH_MAX? */
770 len = strnlen(filename, PATH_MAX);
771 }
772
773 /* BB fixme - hash low and high 32 bits if not 64 bit arch BB fixme */
774 if(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM)
775 *pinum = pFindData->UniqueId;
776 } else if(level == SMB_FIND_FILE_DIRECTORY_INFO) {
777 FILE_DIRECTORY_INFO * pFindData =
778 (FILE_DIRECTORY_INFO *)current_entry;
779 filename = &pFindData->FileName[0];
780 len = le32_to_cpu(pFindData->FileNameLength);
781 } else if(level == SMB_FIND_FILE_FULL_DIRECTORY_INFO) {
782 FILE_FULL_DIRECTORY_INFO * pFindData =
783 (FILE_FULL_DIRECTORY_INFO *)current_entry;
784 filename = &pFindData->FileName[0];
785 len = le32_to_cpu(pFindData->FileNameLength);
786 } else if(level == SMB_FIND_FILE_ID_FULL_DIR_INFO) {
787 SEARCH_ID_FULL_DIR_INFO * pFindData =
788 (SEARCH_ID_FULL_DIR_INFO *)current_entry;
789 filename = &pFindData->FileName[0];
790 len = le32_to_cpu(pFindData->FileNameLength);
791 *pinum = pFindData->UniqueId;
792 } else if(level == SMB_FIND_FILE_BOTH_DIRECTORY_INFO) {
793 FILE_BOTH_DIRECTORY_INFO * pFindData =
794 (FILE_BOTH_DIRECTORY_INFO *)current_entry;
795 filename = &pFindData->FileName[0];
796 len = le32_to_cpu(pFindData->FileNameLength);
797 } else if(level == SMB_FIND_FILE_INFO_STANDARD) {
798 FIND_FILE_STANDARD_INFO * pFindData =
799 (FIND_FILE_STANDARD_INFO *)current_entry;
800 filename = &pFindData->FileName[0];
801 /* one byte length, no name conversion */
802 len = (unsigned int)pFindData->FileNameLength;
803 } else {
804 cFYI(1,("Unknown findfirst level %d",level));
805 return -EINVAL;
806 }
807
808 if(len > max_len) {
809 cERROR(1,("bad search response length %d past smb end", len));
810 return -EINVAL;
811 }
812
813 if(unicode) {
814 /* BB fixme - test with long names */
815 /* Note converted filename can be longer than in unicode */
816 if(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR)
817 pqst->len = cifs_convertUCSpath((char *)pqst->name,
818 (__le16 *)filename, len/2, nlt);
819 else
820 pqst->len = cifs_strfromUCS_le((char *)pqst->name,
821 (__le16 *)filename,len/2,nlt);
822 } else {
823 pqst->name = filename;
824 pqst->len = len;
825 }
826 pqst->hash = full_name_hash(pqst->name,pqst->len);
827 /* cFYI(1,("filldir on %s",pqst->name)); */
828 return rc;
829 }
830
831 static int cifs_filldir(char *pfindEntry, struct file *file,
832 filldir_t filldir, void *direntry, char *scratch_buf, int max_len)
833 {
834 int rc = 0;
835 struct qstr qstring;
836 struct cifsFileInfo * pCifsF;
837 unsigned obj_type;
838 ino_t inum;
839 struct cifs_sb_info * cifs_sb;
840 struct inode *tmp_inode;
841 struct dentry *tmp_dentry;
842
843 /* get filename and len into qstring */
844 /* get dentry */
845 /* decide whether to create and populate ionde */
846 if((direntry == NULL) || (file == NULL))
847 return -EINVAL;
848
849 pCifsF = file->private_data;
850
851 if((scratch_buf == NULL) || (pfindEntry == NULL) || (pCifsF == NULL))
852 return -ENOENT;
853
854 if(file->f_path.dentry == NULL)
855 return -ENOENT;
856
857 rc = cifs_entry_is_dot(pfindEntry,pCifsF);
858 /* skip . and .. since we added them first */
859 if(rc != 0)
860 return 0;
861
862 cifs_sb = CIFS_SB(file->f_path.dentry->d_sb);
863
864 qstring.name = scratch_buf;
865 rc = cifs_get_name_from_search_buf(&qstring,pfindEntry,
866 pCifsF->srch_inf.info_level,
867 pCifsF->srch_inf.unicode,cifs_sb,
868 max_len,
869 &inum /* returned */);
870
871 if(rc)
872 return rc;
873
874 rc = construct_dentry(&qstring,file,&tmp_inode, &tmp_dentry);
875 if((tmp_inode == NULL) || (tmp_dentry == NULL))
876 return -ENOMEM;
877
878 if(rc) {
879 /* inode created, we need to hash it with right inode number */
880 if(inum != 0) {
881 /* BB fixme - hash the 2 32 quantities bits together if necessary BB */
882 tmp_inode->i_ino = inum;
883 }
884 insert_inode_hash(tmp_inode);
885 }
886
887 /* we pass in rc below, indicating whether it is a new inode,
888 so we can figure out whether to invalidate the inode cached
889 data if the file has changed */
890 if(pCifsF->srch_inf.info_level == SMB_FIND_FILE_UNIX)
891 unix_fill_in_inode(tmp_inode,
892 (FILE_UNIX_INFO *)pfindEntry,
893 &obj_type, rc);
894 else if(pCifsF->srch_inf.info_level == SMB_FIND_FILE_INFO_STANDARD)
895 fill_in_inode(tmp_inode, 0 /* old level 1 buffer type */,
896 pfindEntry, &obj_type, rc);
897 else
898 fill_in_inode(tmp_inode, 1 /* NT */, pfindEntry, &obj_type, rc);
899
900 if(rc) /* new inode - needs to be tied to dentry */ {
901 d_instantiate(tmp_dentry, tmp_inode);
902 if(rc == 2)
903 d_rehash(tmp_dentry);
904 }
905
906
907 rc = filldir(direntry,qstring.name,qstring.len,file->f_pos,
908 tmp_inode->i_ino,obj_type);
909 if(rc) {
910 cFYI(1,("filldir rc = %d",rc));
911 /* we can not return filldir errors to the caller
912 since they are "normal" when the stat blocksize
913 is too small - we return remapped error instead */
914 rc = -EOVERFLOW;
915 }
916
917 dput(tmp_dentry);
918 return rc;
919 }
920
921 static int cifs_save_resume_key(const char *current_entry,
922 struct cifsFileInfo *cifsFile)
923 {
924 int rc = 0;
925 unsigned int len = 0;
926 __u16 level;
927 char * filename;
928
929 if((cifsFile == NULL) || (current_entry == NULL))
930 return -EINVAL;
931
932 level = cifsFile->srch_inf.info_level;
933
934 if(level == SMB_FIND_FILE_UNIX) {
935 FILE_UNIX_INFO * pFindData = (FILE_UNIX_INFO *)current_entry;
936
937 filename = &pFindData->FileName[0];
938 if(cifsFile->srch_inf.unicode) {
939 len = cifs_unicode_bytelen(filename);
940 } else {
941 /* BB should we make this strnlen of PATH_MAX? */
942 len = strnlen(filename, PATH_MAX);
943 }
944 cifsFile->srch_inf.resume_key = pFindData->ResumeKey;
945 } else if(level == SMB_FIND_FILE_DIRECTORY_INFO) {
946 FILE_DIRECTORY_INFO * pFindData =
947 (FILE_DIRECTORY_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_FULL_DIRECTORY_INFO) {
952 FILE_FULL_DIRECTORY_INFO * pFindData =
953 (FILE_FULL_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_ID_FULL_DIR_INFO) {
958 SEARCH_ID_FULL_DIR_INFO * pFindData =
959 (SEARCH_ID_FULL_DIR_INFO *)current_entry;
960 filename = &pFindData->FileName[0];
961 len = le32_to_cpu(pFindData->FileNameLength);
962 cifsFile->srch_inf.resume_key = pFindData->FileIndex;
963 } else if(level == SMB_FIND_FILE_BOTH_DIRECTORY_INFO) {
964 FILE_BOTH_DIRECTORY_INFO * pFindData =
965 (FILE_BOTH_DIRECTORY_INFO *)current_entry;
966 filename = &pFindData->FileName[0];
967 len = le32_to_cpu(pFindData->FileNameLength);
968 cifsFile->srch_inf.resume_key = pFindData->FileIndex;
969 } else if(level == SMB_FIND_FILE_INFO_STANDARD) {
970 FIND_FILE_STANDARD_INFO * pFindData =
971 (FIND_FILE_STANDARD_INFO *)current_entry;
972 filename = &pFindData->FileName[0];
973 /* one byte length, no name conversion */
974 len = (unsigned int)pFindData->FileNameLength;
975 cifsFile->srch_inf.resume_key = pFindData->ResumeKey;
976 } else {
977 cFYI(1,("Unknown findfirst level %d",level));
978 return -EINVAL;
979 }
980 cifsFile->srch_inf.resume_name_len = len;
981 cifsFile->srch_inf.presume_name = filename;
982 return rc;
983 }
984
985 int cifs_readdir(struct file *file, void *direntry, filldir_t filldir)
986 {
987 int rc = 0;
988 int xid,i;
989 struct cifs_sb_info *cifs_sb;
990 struct cifsTconInfo *pTcon;
991 struct cifsFileInfo *cifsFile = NULL;
992 char * current_entry;
993 int num_to_fill = 0;
994 char * tmp_buf = NULL;
995 char * end_of_smb;
996 int max_len;
997
998 xid = GetXid();
999
1000 if(file->f_path.dentry == NULL) {
1001 FreeXid(xid);
1002 return -EIO;
1003 }
1004
1005 cifs_sb = CIFS_SB(file->f_path.dentry->d_sb);
1006 pTcon = cifs_sb->tcon;
1007 if(pTcon == NULL)
1008 return -EINVAL;
1009
1010 switch ((int) file->f_pos) {
1011 case 0:
1012 if (filldir(direntry, ".", 1, file->f_pos,
1013 file->f_path.dentry->d_inode->i_ino, DT_DIR) < 0) {
1014 cERROR(1, ("Filldir for current dir failed"));
1015 rc = -ENOMEM;
1016 break;
1017 }
1018 file->f_pos++;
1019 case 1:
1020 if (filldir(direntry, "..", 2, file->f_pos,
1021 file->f_path.dentry->d_parent->d_inode->i_ino, DT_DIR) < 0) {
1022 cERROR(1, ("Filldir for parent dir failed"));
1023 rc = -ENOMEM;
1024 break;
1025 }
1026 file->f_pos++;
1027 default:
1028 /* 1) If search is active,
1029 is in current search buffer?
1030 if it before then restart search
1031 if after then keep searching till find it */
1032
1033 if(file->private_data == NULL) {
1034 rc = initiate_cifs_search(xid,file);
1035 cFYI(1,("initiate cifs search rc %d",rc));
1036 if(rc) {
1037 FreeXid(xid);
1038 return rc;
1039 }
1040 }
1041 if(file->private_data == NULL) {
1042 rc = -EINVAL;
1043 FreeXid(xid);
1044 return rc;
1045 }
1046 cifsFile = file->private_data;
1047 if (cifsFile->srch_inf.endOfSearch) {
1048 if(cifsFile->srch_inf.emptyDir) {
1049 cFYI(1, ("End of search, empty dir"));
1050 rc = 0;
1051 break;
1052 }
1053 } /* else {
1054 cifsFile->invalidHandle = TRUE;
1055 CIFSFindClose(xid, pTcon, cifsFile->netfid);
1056 }
1057 kfree(cifsFile->search_resume_name);
1058 cifsFile->search_resume_name = NULL; */
1059
1060 rc = find_cifs_entry(xid,pTcon, file,
1061 &current_entry,&num_to_fill);
1062 if(rc) {
1063 cFYI(1,("fce error %d",rc));
1064 goto rddir2_exit;
1065 } else if (current_entry != NULL) {
1066 cFYI(1,("entry %lld found",file->f_pos));
1067 } else {
1068 cFYI(1,("could not find entry"));
1069 goto rddir2_exit;
1070 }
1071 cFYI(1,("loop through %d times filling dir for net buf %p",
1072 num_to_fill,cifsFile->srch_inf.ntwrk_buf_start));
1073 max_len = smbCalcSize((struct smb_hdr *)
1074 cifsFile->srch_inf.ntwrk_buf_start);
1075 end_of_smb = cifsFile->srch_inf.ntwrk_buf_start + max_len;
1076
1077 /* To be safe - for UCS to UTF-8 with strings loaded
1078 with the rare long characters alloc more to account for
1079 such multibyte target UTF-8 characters. cifs_unicode.c,
1080 which actually does the conversion, has the same limit */
1081 tmp_buf = kmalloc((2 * NAME_MAX) + 4, GFP_KERNEL);
1082 for(i=0;(i<num_to_fill) && (rc == 0);i++) {
1083 if(current_entry == NULL) {
1084 /* evaluate whether this case is an error */
1085 cERROR(1,("past end of SMB num to fill %d i %d",
1086 num_to_fill, i));
1087 break;
1088 }
1089 /* if buggy server returns . and .. late do
1090 we want to check for that here? */
1091 rc = cifs_filldir(current_entry, file,
1092 filldir, direntry, tmp_buf, max_len);
1093 if(rc == -EOVERFLOW) {
1094 rc = 0;
1095 break;
1096 }
1097
1098 file->f_pos++;
1099 if(file->f_pos ==
1100 cifsFile->srch_inf.index_of_last_entry) {
1101 cFYI(1,("last entry in buf at pos %lld %s",
1102 file->f_pos,tmp_buf));
1103 cifs_save_resume_key(current_entry,cifsFile);
1104 break;
1105 } else
1106 current_entry =
1107 nxt_dir_entry(current_entry, end_of_smb,
1108 cifsFile->srch_inf.info_level);
1109 }
1110 kfree(tmp_buf);
1111 break;
1112 } /* end switch */
1113
1114 rddir2_exit:
1115 FreeXid(xid);
1116 return rc;
1117 }
AMDTP streaming driver for the Linux FireWire stack (Juju)