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dmar: fix using early fixmap mapping for DMAR table parsing
[deliverable/linux.git] / fs / cifs / readdir.c
1 /*
2 * fs/cifs/readdir.c
3 *
4 * Directory search handling
5 *
6 * Copyright (C) International Business Machines Corp., 2004, 2008
7 * Author(s): Steve French (sfrench@us.ibm.com)
8 *
9 * This library is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU Lesser General Public License as published
11 * by the Free Software Foundation; either version 2.1 of the License, or
12 * (at your option) any later version.
13 *
14 * This library is distributed in the hope that it will be useful,
15 * but WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See
17 * the GNU Lesser General Public License for more details.
18 *
19 * You should have received a copy of the GNU Lesser General Public License
20 * along with this library; if not, write to the Free Software
21 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
22 */
23 #include <linux/fs.h>
24 #include <linux/pagemap.h>
25 #include <linux/stat.h>
26 #include "cifspdu.h"
27 #include "cifsglob.h"
28 #include "cifsproto.h"
29 #include "cifs_unicode.h"
30 #include "cifs_debug.h"
31 #include "cifs_fs_sb.h"
32 #include "cifsfs.h"
33
34 #ifdef CONFIG_CIFS_DEBUG2
35 static void dump_cifs_file_struct(struct file *file, char *label)
36 {
37 struct cifsFileInfo *cf;
38
39 if (file) {
40 cf = file->private_data;
41 if (cf == NULL) {
42 cFYI(1, ("empty cifs private file data"));
43 return;
44 }
45 if (cf->invalidHandle)
46 cFYI(1, ("invalid handle"));
47 if (cf->srch_inf.endOfSearch)
48 cFYI(1, ("end of search"));
49 if (cf->srch_inf.emptyDir)
50 cFYI(1, ("empty dir"));
51 }
52 }
53 #else
54 static inline void dump_cifs_file_struct(struct file *file, char *label)
55 {
56 }
57 #endif /* DEBUG2 */
58
59 /* Returns one if new inode created (which therefore needs to be hashed) */
60 /* Might check in the future if inode number changed so we can rehash inode */
61 static int construct_dentry(struct qstr *qstring, struct file *file,
62 struct inode **ptmp_inode, struct dentry **pnew_dentry)
63 {
64 struct dentry *tmp_dentry;
65 struct cifs_sb_info *cifs_sb;
66 struct cifsTconInfo *pTcon;
67 int rc = 0;
68
69 cFYI(1, ("For %s", qstring->name));
70 cifs_sb = CIFS_SB(file->f_path.dentry->d_sb);
71 pTcon = cifs_sb->tcon;
72
73 qstring->hash = full_name_hash(qstring->name, qstring->len);
74 tmp_dentry = d_lookup(file->f_path.dentry, qstring);
75 if (tmp_dentry) {
76 cFYI(0, ("existing dentry with inode 0x%p",
77 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, unsigned 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 umode_t default_mode;
136
137 /* save mtime and size */
138 local_mtime = tmp_inode->i_mtime;
139 local_size = tmp_inode->i_size;
140
141 if (new_buf_type) {
142 FILE_DIRECTORY_INFO *pfindData = (FILE_DIRECTORY_INFO *)buf;
143
144 attr = le32_to_cpu(pfindData->ExtFileAttributes);
145 allocation_size = le64_to_cpu(pfindData->AllocationSize);
146 end_of_file = le64_to_cpu(pfindData->EndOfFile);
147 tmp_inode->i_atime =
148 cifs_NTtimeToUnix(le64_to_cpu(pfindData->LastAccessTime));
149 tmp_inode->i_mtime =
150 cifs_NTtimeToUnix(le64_to_cpu(pfindData->LastWriteTime));
151 tmp_inode->i_ctime =
152 cifs_NTtimeToUnix(le64_to_cpu(pfindData->ChangeTime));
153 } else { /* legacy, OS2 and DOS style */
154 /* struct timespec ts;*/
155 FIND_FILE_STANDARD_INFO *pfindData =
156 (FIND_FILE_STANDARD_INFO *)buf;
157
158 tmp_inode->i_mtime = cnvrtDosUnixTm(
159 le16_to_cpu(pfindData->LastWriteDate),
160 le16_to_cpu(pfindData->LastWriteTime));
161 tmp_inode->i_atime = cnvrtDosUnixTm(
162 le16_to_cpu(pfindData->LastAccessDate),
163 le16_to_cpu(pfindData->LastAccessTime));
164 tmp_inode->i_ctime = cnvrtDosUnixTm(
165 le16_to_cpu(pfindData->LastWriteDate),
166 le16_to_cpu(pfindData->LastWriteTime));
167 AdjustForTZ(cifs_sb->tcon, tmp_inode);
168 attr = le16_to_cpu(pfindData->Attributes);
169 allocation_size = le32_to_cpu(pfindData->AllocationSize);
170 end_of_file = le32_to_cpu(pfindData->DataSize);
171 }
172
173 /* Linux can not store file creation time unfortunately so ignore it */
174
175 cifsInfo->cifsAttrs = attr;
176 #ifdef CONFIG_CIFS_EXPERIMENTAL
177 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_CIFS_ACL) {
178 /* get more accurate mode via ACL - so force inode refresh */
179 cifsInfo->time = 0;
180 } else
181 #endif /* CONFIG_CIFS_EXPERIMENTAL */
182 cifsInfo->time = jiffies;
183
184 /* treat dos attribute of read-only as read-only mode bit e.g. 555? */
185 /* 2767 perms - indicate mandatory locking */
186 /* BB fill in uid and gid here? with help from winbind?
187 or retrieve from NTFS stream extended attribute */
188 if (atomic_read(&cifsInfo->inUse) == 0) {
189 tmp_inode->i_uid = cifs_sb->mnt_uid;
190 tmp_inode->i_gid = cifs_sb->mnt_gid;
191 }
192
193 if (attr & ATTR_DIRECTORY)
194 default_mode = cifs_sb->mnt_dir_mode;
195 else
196 default_mode = cifs_sb->mnt_file_mode;
197
198 /* set initial permissions */
199 if ((atomic_read(&cifsInfo->inUse) == 0) ||
200 (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DYNPERM) == 0)
201 tmp_inode->i_mode = default_mode;
202 else {
203 /* just reenable write bits if !ATTR_READONLY */
204 if ((tmp_inode->i_mode & S_IWUGO) == 0 &&
205 (attr & ATTR_READONLY) == 0)
206 tmp_inode->i_mode |= (S_IWUGO & default_mode);
207
208 tmp_inode->i_mode &= ~S_IFMT;
209 }
210
211 /* clear write bits if ATTR_READONLY is set */
212 if (attr & ATTR_READONLY)
213 tmp_inode->i_mode &= ~S_IWUGO;
214
215 /* set inode type */
216 if ((attr & ATTR_SYSTEM) &&
217 (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_UNX_EMUL)) {
218 if (end_of_file == 0) {
219 tmp_inode->i_mode |= S_IFIFO;
220 *pobject_type = DT_FIFO;
221 } else {
222 /*
223 * trying to get the type can be slow, so just call
224 * this a regular file for now, and mark for reval
225 */
226 tmp_inode->i_mode |= S_IFREG;
227 *pobject_type = DT_REG;
228 cifsInfo->time = 0;
229 }
230 } else {
231 if (attr & ATTR_DIRECTORY) {
232 tmp_inode->i_mode |= S_IFDIR;
233 *pobject_type = DT_DIR;
234 } else {
235 tmp_inode->i_mode |= S_IFREG;
236 *pobject_type = DT_REG;
237 }
238 }
239
240 /* can not fill in nlink here as in qpathinfo version and Unx search */
241 if (atomic_read(&cifsInfo->inUse) == 0)
242 atomic_set(&cifsInfo->inUse, 1);
243
244 spin_lock(&tmp_inode->i_lock);
245 if (is_size_safe_to_change(cifsInfo, end_of_file)) {
246 /* can not safely change the file size here if the
247 client is writing to it due to potential races */
248 i_size_write(tmp_inode, end_of_file);
249
250 /* 512 bytes (2**9) is the fake blocksize that must be used */
251 /* for this calculation, even though the reported blocksize is larger */
252 tmp_inode->i_blocks = (512 - 1 + allocation_size) >> 9;
253 }
254 spin_unlock(&tmp_inode->i_lock);
255
256 if (allocation_size < end_of_file)
257 cFYI(1, ("May be sparse file, allocation less than file size"));
258 cFYI(1, ("File Size %ld and blocks %llu",
259 (unsigned long)tmp_inode->i_size,
260 (unsigned long long)tmp_inode->i_blocks));
261 if (S_ISREG(tmp_inode->i_mode)) {
262 cFYI(1, ("File inode"));
263 tmp_inode->i_op = &cifs_file_inode_ops;
264 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DIRECT_IO) {
265 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_BRL)
266 tmp_inode->i_fop = &cifs_file_direct_nobrl_ops;
267 else
268 tmp_inode->i_fop = &cifs_file_direct_ops;
269 } else if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_BRL)
270 tmp_inode->i_fop = &cifs_file_nobrl_ops;
271 else
272 tmp_inode->i_fop = &cifs_file_ops;
273
274 if ((cifs_sb->tcon) && (cifs_sb->tcon->ses) &&
275 (cifs_sb->tcon->ses->server->maxBuf <
276 PAGE_CACHE_SIZE + MAX_CIFS_HDR_SIZE))
277 tmp_inode->i_data.a_ops = &cifs_addr_ops_smallbuf;
278 else
279 tmp_inode->i_data.a_ops = &cifs_addr_ops;
280
281 if (isNewInode)
282 return; /* No sense invalidating pages for new inode
283 since have not started caching readahead file
284 data yet */
285
286 if (timespec_equal(&tmp_inode->i_mtime, &local_mtime) &&
287 (local_size == tmp_inode->i_size)) {
288 cFYI(1, ("inode exists but unchanged"));
289 } else {
290 /* file may have changed on server */
291 cFYI(1, ("invalidate inode, readdir detected change"));
292 invalidate_remote_inode(tmp_inode);
293 }
294 } else if (S_ISDIR(tmp_inode->i_mode)) {
295 cFYI(1, ("Directory inode"));
296 tmp_inode->i_op = &cifs_dir_inode_ops;
297 tmp_inode->i_fop = &cifs_dir_ops;
298 } else if (S_ISLNK(tmp_inode->i_mode)) {
299 cFYI(1, ("Symbolic Link inode"));
300 tmp_inode->i_op = &cifs_symlink_inode_ops;
301 } else {
302 cFYI(1, ("Init special inode"));
303 init_special_inode(tmp_inode, tmp_inode->i_mode,
304 tmp_inode->i_rdev);
305 }
306 }
307
308 static void unix_fill_in_inode(struct inode *tmp_inode,
309 FILE_UNIX_INFO *pfindData, unsigned int *pobject_type, int isNewInode)
310 {
311 loff_t local_size;
312 struct timespec local_mtime;
313
314 struct cifsInodeInfo *cifsInfo = CIFS_I(tmp_inode);
315 struct cifs_sb_info *cifs_sb = CIFS_SB(tmp_inode->i_sb);
316
317 __u32 type = le32_to_cpu(pfindData->Type);
318 __u64 num_of_bytes = le64_to_cpu(pfindData->NumOfBytes);
319 __u64 end_of_file = le64_to_cpu(pfindData->EndOfFile);
320 cifsInfo->time = jiffies;
321 atomic_inc(&cifsInfo->inUse);
322
323 /* save mtime and size */
324 local_mtime = tmp_inode->i_mtime;
325 local_size = tmp_inode->i_size;
326
327 tmp_inode->i_atime =
328 cifs_NTtimeToUnix(le64_to_cpu(pfindData->LastAccessTime));
329 tmp_inode->i_mtime =
330 cifs_NTtimeToUnix(le64_to_cpu(pfindData->LastModificationTime));
331 tmp_inode->i_ctime =
332 cifs_NTtimeToUnix(le64_to_cpu(pfindData->LastStatusChange));
333
334 tmp_inode->i_mode = le64_to_cpu(pfindData->Permissions);
335 /* since we set the inode type below we need to mask off type
336 to avoid strange results if bits above were corrupt */
337 tmp_inode->i_mode &= ~S_IFMT;
338 if (type == UNIX_FILE) {
339 *pobject_type = DT_REG;
340 tmp_inode->i_mode |= S_IFREG;
341 } else if (type == UNIX_SYMLINK) {
342 *pobject_type = DT_LNK;
343 tmp_inode->i_mode |= S_IFLNK;
344 } else if (type == UNIX_DIR) {
345 *pobject_type = DT_DIR;
346 tmp_inode->i_mode |= S_IFDIR;
347 } else if (type == UNIX_CHARDEV) {
348 *pobject_type = DT_CHR;
349 tmp_inode->i_mode |= S_IFCHR;
350 tmp_inode->i_rdev = MKDEV(le64_to_cpu(pfindData->DevMajor),
351 le64_to_cpu(pfindData->DevMinor) & MINORMASK);
352 } else if (type == UNIX_BLOCKDEV) {
353 *pobject_type = DT_BLK;
354 tmp_inode->i_mode |= S_IFBLK;
355 tmp_inode->i_rdev = MKDEV(le64_to_cpu(pfindData->DevMajor),
356 le64_to_cpu(pfindData->DevMinor) & MINORMASK);
357 } else if (type == UNIX_FIFO) {
358 *pobject_type = DT_FIFO;
359 tmp_inode->i_mode |= S_IFIFO;
360 } else if (type == UNIX_SOCKET) {
361 *pobject_type = DT_SOCK;
362 tmp_inode->i_mode |= S_IFSOCK;
363 } else {
364 /* safest to just call it a file */
365 *pobject_type = DT_REG;
366 tmp_inode->i_mode |= S_IFREG;
367 cFYI(1, ("unknown inode type %d", type));
368 }
369
370 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_OVERR_UID)
371 tmp_inode->i_uid = cifs_sb->mnt_uid;
372 else
373 tmp_inode->i_uid = le64_to_cpu(pfindData->Uid);
374 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_OVERR_GID)
375 tmp_inode->i_gid = cifs_sb->mnt_gid;
376 else
377 tmp_inode->i_gid = le64_to_cpu(pfindData->Gid);
378 tmp_inode->i_nlink = le64_to_cpu(pfindData->Nlinks);
379
380 spin_lock(&tmp_inode->i_lock);
381 if (is_size_safe_to_change(cifsInfo, end_of_file)) {
382 /* can not safely change the file size here if the
383 client is writing to it due to potential races */
384 i_size_write(tmp_inode, end_of_file);
385
386 /* 512 bytes (2**9) is the fake blocksize that must be used */
387 /* for this calculation, not the real blocksize */
388 tmp_inode->i_blocks = (512 - 1 + num_of_bytes) >> 9;
389 }
390 spin_unlock(&tmp_inode->i_lock);
391
392 if (S_ISREG(tmp_inode->i_mode)) {
393 cFYI(1, ("File inode"));
394 tmp_inode->i_op = &cifs_file_inode_ops;
395
396 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DIRECT_IO) {
397 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_BRL)
398 tmp_inode->i_fop = &cifs_file_direct_nobrl_ops;
399 else
400 tmp_inode->i_fop = &cifs_file_direct_ops;
401 } else if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_BRL)
402 tmp_inode->i_fop = &cifs_file_nobrl_ops;
403 else
404 tmp_inode->i_fop = &cifs_file_ops;
405
406 if ((cifs_sb->tcon) && (cifs_sb->tcon->ses) &&
407 (cifs_sb->tcon->ses->server->maxBuf <
408 PAGE_CACHE_SIZE + MAX_CIFS_HDR_SIZE))
409 tmp_inode->i_data.a_ops = &cifs_addr_ops_smallbuf;
410 else
411 tmp_inode->i_data.a_ops = &cifs_addr_ops;
412
413 if (isNewInode)
414 return; /* No sense invalidating pages for new inode
415 since we have not started caching readahead
416 file data for it yet */
417
418 if (timespec_equal(&tmp_inode->i_mtime, &local_mtime) &&
419 (local_size == tmp_inode->i_size)) {
420 cFYI(1, ("inode exists but unchanged"));
421 } else {
422 /* file may have changed on server */
423 cFYI(1, ("invalidate inode, readdir detected change"));
424 invalidate_remote_inode(tmp_inode);
425 }
426 } else if (S_ISDIR(tmp_inode->i_mode)) {
427 cFYI(1, ("Directory inode"));
428 tmp_inode->i_op = &cifs_dir_inode_ops;
429 tmp_inode->i_fop = &cifs_dir_ops;
430 } else if (S_ISLNK(tmp_inode->i_mode)) {
431 cFYI(1, ("Symbolic Link inode"));
432 tmp_inode->i_op = &cifs_symlink_inode_ops;
433 /* tmp_inode->i_fop = *//* do not need to set to anything */
434 } else {
435 cFYI(1, ("Special inode"));
436 init_special_inode(tmp_inode, tmp_inode->i_mode,
437 tmp_inode->i_rdev);
438 }
439 }
440
441 static int initiate_cifs_search(const int xid, struct file *file)
442 {
443 int rc = 0;
444 char *full_path;
445 struct cifsFileInfo *cifsFile;
446 struct cifs_sb_info *cifs_sb;
447 struct cifsTconInfo *pTcon;
448
449 if (file->private_data == NULL) {
450 file->private_data =
451 kzalloc(sizeof(struct cifsFileInfo), GFP_KERNEL);
452 }
453
454 if (file->private_data == NULL)
455 return -ENOMEM;
456 cifsFile = file->private_data;
457 cifsFile->invalidHandle = true;
458 cifsFile->srch_inf.endOfSearch = false;
459
460 cifs_sb = CIFS_SB(file->f_path.dentry->d_sb);
461 if (cifs_sb == NULL)
462 return -EINVAL;
463
464 pTcon = cifs_sb->tcon;
465 if (pTcon == NULL)
466 return -EINVAL;
467
468 full_path = build_path_from_dentry(file->f_path.dentry);
469
470 if (full_path == NULL)
471 return -ENOMEM;
472
473 cFYI(1, ("Full path: %s start at: %lld", full_path, file->f_pos));
474
475 ffirst_retry:
476 /* test for Unix extensions */
477 /* but now check for them on the share/mount not on the SMB session */
478 /* if (pTcon->ses->capabilities & CAP_UNIX) { */
479 if (pTcon->unix_ext)
480 cifsFile->srch_inf.info_level = SMB_FIND_FILE_UNIX;
481 else if ((pTcon->ses->capabilities &
482 (CAP_NT_SMBS | CAP_NT_FIND)) == 0) {
483 cifsFile->srch_inf.info_level = SMB_FIND_FILE_INFO_STANDARD;
484 } else if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM) {
485 cifsFile->srch_inf.info_level = SMB_FIND_FILE_ID_FULL_DIR_INFO;
486 } else /* not srvinos - BB fixme add check for backlevel? */ {
487 cifsFile->srch_inf.info_level = SMB_FIND_FILE_DIRECTORY_INFO;
488 }
489
490 rc = CIFSFindFirst(xid, pTcon, full_path, cifs_sb->local_nls,
491 &cifsFile->netfid, &cifsFile->srch_inf,
492 cifs_sb->mnt_cifs_flags &
493 CIFS_MOUNT_MAP_SPECIAL_CHR, CIFS_DIR_SEP(cifs_sb));
494 if (rc == 0)
495 cifsFile->invalidHandle = false;
496 if ((rc == -EOPNOTSUPP) &&
497 (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM)) {
498 cifs_sb->mnt_cifs_flags &= ~CIFS_MOUNT_SERVER_INUM;
499 goto ffirst_retry;
500 }
501 kfree(full_path);
502 return rc;
503 }
504
505 /* return length of unicode string in bytes */
506 static int cifs_unicode_bytelen(char *str)
507 {
508 int len;
509 __le16 *ustr = (__le16 *)str;
510
511 for (len = 0; len <= PATH_MAX; len++) {
512 if (ustr[len] == 0)
513 return len << 1;
514 }
515 cFYI(1, ("Unicode string longer than PATH_MAX found"));
516 return len << 1;
517 }
518
519 static char *nxt_dir_entry(char *old_entry, char *end_of_smb, int level)
520 {
521 char *new_entry;
522 FILE_DIRECTORY_INFO *pDirInfo = (FILE_DIRECTORY_INFO *)old_entry;
523
524 if (level == SMB_FIND_FILE_INFO_STANDARD) {
525 FIND_FILE_STANDARD_INFO *pfData;
526 pfData = (FIND_FILE_STANDARD_INFO *)pDirInfo;
527
528 new_entry = old_entry + sizeof(FIND_FILE_STANDARD_INFO) +
529 pfData->FileNameLength;
530 } else
531 new_entry = old_entry + le32_to_cpu(pDirInfo->NextEntryOffset);
532 cFYI(1, ("new entry %p old entry %p", new_entry, old_entry));
533 /* validate that new_entry is not past end of SMB */
534 if (new_entry >= end_of_smb) {
535 cERROR(1,
536 ("search entry %p began after end of SMB %p old entry %p",
537 new_entry, end_of_smb, old_entry));
538 return NULL;
539 } else if (((level == SMB_FIND_FILE_INFO_STANDARD) &&
540 (new_entry + sizeof(FIND_FILE_STANDARD_INFO) > end_of_smb))
541 || ((level != SMB_FIND_FILE_INFO_STANDARD) &&
542 (new_entry + sizeof(FILE_DIRECTORY_INFO) > end_of_smb))) {
543 cERROR(1, ("search entry %p extends after end of SMB %p",
544 new_entry, end_of_smb));
545 return NULL;
546 } else
547 return new_entry;
548
549 }
550
551 #define UNICODE_DOT cpu_to_le16(0x2e)
552
553 /* return 0 if no match and 1 for . (current directory) and 2 for .. (parent) */
554 static int cifs_entry_is_dot(char *current_entry, struct cifsFileInfo *cfile)
555 {
556 int rc = 0;
557 char *filename = NULL;
558 int len = 0;
559
560 if (cfile->srch_inf.info_level == SMB_FIND_FILE_UNIX) {
561 FILE_UNIX_INFO *pFindData = (FILE_UNIX_INFO *)current_entry;
562 filename = &pFindData->FileName[0];
563 if (cfile->srch_inf.unicode) {
564 len = cifs_unicode_bytelen(filename);
565 } else {
566 /* BB should we make this strnlen of PATH_MAX? */
567 len = strnlen(filename, 5);
568 }
569 } else if (cfile->srch_inf.info_level == SMB_FIND_FILE_DIRECTORY_INFO) {
570 FILE_DIRECTORY_INFO *pFindData =
571 (FILE_DIRECTORY_INFO *)current_entry;
572 filename = &pFindData->FileName[0];
573 len = le32_to_cpu(pFindData->FileNameLength);
574 } else if (cfile->srch_inf.info_level ==
575 SMB_FIND_FILE_FULL_DIRECTORY_INFO) {
576 FILE_FULL_DIRECTORY_INFO *pFindData =
577 (FILE_FULL_DIRECTORY_INFO *)current_entry;
578 filename = &pFindData->FileName[0];
579 len = le32_to_cpu(pFindData->FileNameLength);
580 } else if (cfile->srch_inf.info_level ==
581 SMB_FIND_FILE_ID_FULL_DIR_INFO) {
582 SEARCH_ID_FULL_DIR_INFO *pFindData =
583 (SEARCH_ID_FULL_DIR_INFO *)current_entry;
584 filename = &pFindData->FileName[0];
585 len = le32_to_cpu(pFindData->FileNameLength);
586 } else if (cfile->srch_inf.info_level ==
587 SMB_FIND_FILE_BOTH_DIRECTORY_INFO) {
588 FILE_BOTH_DIRECTORY_INFO *pFindData =
589 (FILE_BOTH_DIRECTORY_INFO *)current_entry;
590 filename = &pFindData->FileName[0];
591 len = le32_to_cpu(pFindData->FileNameLength);
592 } else if (cfile->srch_inf.info_level == SMB_FIND_FILE_INFO_STANDARD) {
593 FIND_FILE_STANDARD_INFO *pFindData =
594 (FIND_FILE_STANDARD_INFO *)current_entry;
595 filename = &pFindData->FileName[0];
596 len = pFindData->FileNameLength;
597 } else {
598 cFYI(1, ("Unknown findfirst level %d",
599 cfile->srch_inf.info_level));
600 }
601
602 if (filename) {
603 if (cfile->srch_inf.unicode) {
604 __le16 *ufilename = (__le16 *)filename;
605 if (len == 2) {
606 /* check for . */
607 if (ufilename[0] == UNICODE_DOT)
608 rc = 1;
609 } else if (len == 4) {
610 /* check for .. */
611 if ((ufilename[0] == UNICODE_DOT)
612 && (ufilename[1] == UNICODE_DOT))
613 rc = 2;
614 }
615 } else /* ASCII */ {
616 if (len == 1) {
617 if (filename[0] == '.')
618 rc = 1;
619 } else if (len == 2) {
620 if ((filename[0] == '.') && (filename[1] == '.'))
621 rc = 2;
622 }
623 }
624 }
625
626 return rc;
627 }
628
629 /* Check if directory that we are searching has changed so we can decide
630 whether we can use the cached search results from the previous search */
631 static int is_dir_changed(struct file *file)
632 {
633 struct inode *inode = file->f_path.dentry->d_inode;
634 struct cifsInodeInfo *cifsInfo = CIFS_I(inode);
635
636 if (cifsInfo->time == 0)
637 return 1; /* directory was changed, perhaps due to unlink */
638 else
639 return 0;
640
641 }
642
643 static int cifs_save_resume_key(const char *current_entry,
644 struct cifsFileInfo *cifsFile)
645 {
646 int rc = 0;
647 unsigned int len = 0;
648 __u16 level;
649 char *filename;
650
651 if ((cifsFile == NULL) || (current_entry == NULL))
652 return -EINVAL;
653
654 level = cifsFile->srch_inf.info_level;
655
656 if (level == SMB_FIND_FILE_UNIX) {
657 FILE_UNIX_INFO *pFindData = (FILE_UNIX_INFO *)current_entry;
658
659 filename = &pFindData->FileName[0];
660 if (cifsFile->srch_inf.unicode) {
661 len = cifs_unicode_bytelen(filename);
662 } else {
663 /* BB should we make this strnlen of PATH_MAX? */
664 len = strnlen(filename, PATH_MAX);
665 }
666 cifsFile->srch_inf.resume_key = pFindData->ResumeKey;
667 } else if (level == SMB_FIND_FILE_DIRECTORY_INFO) {
668 FILE_DIRECTORY_INFO *pFindData =
669 (FILE_DIRECTORY_INFO *)current_entry;
670 filename = &pFindData->FileName[0];
671 len = le32_to_cpu(pFindData->FileNameLength);
672 cifsFile->srch_inf.resume_key = pFindData->FileIndex;
673 } else if (level == SMB_FIND_FILE_FULL_DIRECTORY_INFO) {
674 FILE_FULL_DIRECTORY_INFO *pFindData =
675 (FILE_FULL_DIRECTORY_INFO *)current_entry;
676 filename = &pFindData->FileName[0];
677 len = le32_to_cpu(pFindData->FileNameLength);
678 cifsFile->srch_inf.resume_key = pFindData->FileIndex;
679 } else if (level == SMB_FIND_FILE_ID_FULL_DIR_INFO) {
680 SEARCH_ID_FULL_DIR_INFO *pFindData =
681 (SEARCH_ID_FULL_DIR_INFO *)current_entry;
682 filename = &pFindData->FileName[0];
683 len = le32_to_cpu(pFindData->FileNameLength);
684 cifsFile->srch_inf.resume_key = pFindData->FileIndex;
685 } else if (level == SMB_FIND_FILE_BOTH_DIRECTORY_INFO) {
686 FILE_BOTH_DIRECTORY_INFO *pFindData =
687 (FILE_BOTH_DIRECTORY_INFO *)current_entry;
688 filename = &pFindData->FileName[0];
689 len = le32_to_cpu(pFindData->FileNameLength);
690 cifsFile->srch_inf.resume_key = pFindData->FileIndex;
691 } else if (level == SMB_FIND_FILE_INFO_STANDARD) {
692 FIND_FILE_STANDARD_INFO *pFindData =
693 (FIND_FILE_STANDARD_INFO *)current_entry;
694 filename = &pFindData->FileName[0];
695 /* one byte length, no name conversion */
696 len = (unsigned int)pFindData->FileNameLength;
697 cifsFile->srch_inf.resume_key = pFindData->ResumeKey;
698 } else {
699 cFYI(1, ("Unknown findfirst level %d", level));
700 return -EINVAL;
701 }
702 cifsFile->srch_inf.resume_name_len = len;
703 cifsFile->srch_inf.presume_name = filename;
704 return rc;
705 }
706
707 /* find the corresponding entry in the search */
708 /* Note that the SMB server returns search entries for . and .. which
709 complicates logic here if we choose to parse for them and we do not
710 assume that they are located in the findfirst return buffer.*/
711 /* We start counting in the buffer with entry 2 and increment for every
712 entry (do not increment for . or .. entry) */
713 static int find_cifs_entry(const int xid, struct cifsTconInfo *pTcon,
714 struct file *file, char **ppCurrentEntry, int *num_to_ret)
715 {
716 int rc = 0;
717 int pos_in_buf = 0;
718 loff_t first_entry_in_buffer;
719 loff_t index_to_find = file->f_pos;
720 struct cifsFileInfo *cifsFile = file->private_data;
721 /* check if index in the buffer */
722
723 if ((cifsFile == NULL) || (ppCurrentEntry == NULL) ||
724 (num_to_ret == NULL))
725 return -ENOENT;
726
727 *ppCurrentEntry = NULL;
728 first_entry_in_buffer =
729 cifsFile->srch_inf.index_of_last_entry -
730 cifsFile->srch_inf.entries_in_buffer;
731
732 /* if first entry in buf is zero then is first buffer
733 in search response data which means it is likely . and ..
734 will be in this buffer, although some servers do not return
735 . and .. for the root of a drive and for those we need
736 to start two entries earlier */
737
738 dump_cifs_file_struct(file, "In fce ");
739 if (((index_to_find < cifsFile->srch_inf.index_of_last_entry) &&
740 is_dir_changed(file)) ||
741 (index_to_find < first_entry_in_buffer)) {
742 /* close and restart search */
743 cFYI(1, ("search backing up - close and restart search"));
744 if (!cifsFile->srch_inf.endOfSearch &&
745 !cifsFile->invalidHandle) {
746 cifsFile->invalidHandle = true;
747 CIFSFindClose(xid, pTcon, cifsFile->netfid);
748 }
749 if (cifsFile->srch_inf.ntwrk_buf_start) {
750 cFYI(1, ("freeing SMB ff cache buf on search rewind"));
751 if (cifsFile->srch_inf.smallBuf)
752 cifs_small_buf_release(cifsFile->srch_inf.
753 ntwrk_buf_start);
754 else
755 cifs_buf_release(cifsFile->srch_inf.
756 ntwrk_buf_start);
757 cifsFile->srch_inf.ntwrk_buf_start = NULL;
758 }
759 rc = initiate_cifs_search(xid, file);
760 if (rc) {
761 cFYI(1, ("error %d reinitiating a search on rewind",
762 rc));
763 return rc;
764 }
765 }
766
767 while ((index_to_find >= cifsFile->srch_inf.index_of_last_entry) &&
768 (rc == 0) && !cifsFile->srch_inf.endOfSearch) {
769 cFYI(1, ("calling findnext2"));
770 cifs_save_resume_key(cifsFile->srch_inf.last_entry, cifsFile);
771 rc = CIFSFindNext(xid, pTcon, cifsFile->netfid,
772 &cifsFile->srch_inf);
773 if (rc)
774 return -ENOENT;
775 }
776 if (index_to_find < cifsFile->srch_inf.index_of_last_entry) {
777 /* we found the buffer that contains the entry */
778 /* scan and find it */
779 int i;
780 char *current_entry;
781 char *end_of_smb = cifsFile->srch_inf.ntwrk_buf_start +
782 smbCalcSize((struct smb_hdr *)
783 cifsFile->srch_inf.ntwrk_buf_start);
784
785 current_entry = cifsFile->srch_inf.srch_entries_start;
786 first_entry_in_buffer = cifsFile->srch_inf.index_of_last_entry
787 - cifsFile->srch_inf.entries_in_buffer;
788 pos_in_buf = index_to_find - first_entry_in_buffer;
789 cFYI(1, ("found entry - pos_in_buf %d", pos_in_buf));
790
791 for (i = 0; (i < (pos_in_buf)) && (current_entry != NULL); i++) {
792 /* go entry by entry figuring out which is first */
793 current_entry = nxt_dir_entry(current_entry, end_of_smb,
794 cifsFile->srch_inf.info_level);
795 }
796 if ((current_entry == NULL) && (i < pos_in_buf)) {
797 /* BB fixme - check if we should flag this error */
798 cERROR(1, ("reached end of buf searching for pos in buf"
799 " %d index to find %lld rc %d",
800 pos_in_buf, index_to_find, rc));
801 }
802 rc = 0;
803 *ppCurrentEntry = current_entry;
804 } else {
805 cFYI(1, ("index not in buffer - could not findnext into it"));
806 return 0;
807 }
808
809 if (pos_in_buf >= cifsFile->srch_inf.entries_in_buffer) {
810 cFYI(1, ("can not return entries pos_in_buf beyond last"));
811 *num_to_ret = 0;
812 } else
813 *num_to_ret = cifsFile->srch_inf.entries_in_buffer - pos_in_buf;
814
815 return rc;
816 }
817
818 /* inode num, inode type and filename returned */
819 static int cifs_get_name_from_search_buf(struct qstr *pqst,
820 char *current_entry, __u16 level, unsigned int unicode,
821 struct cifs_sb_info *cifs_sb, int max_len, ino_t *pinum)
822 {
823 int rc = 0;
824 unsigned int len = 0;
825 char *filename;
826 struct nls_table *nlt = cifs_sb->local_nls;
827
828 *pinum = 0;
829
830 if (level == SMB_FIND_FILE_UNIX) {
831 FILE_UNIX_INFO *pFindData = (FILE_UNIX_INFO *)current_entry;
832
833 filename = &pFindData->FileName[0];
834 if (unicode) {
835 len = cifs_unicode_bytelen(filename);
836 } else {
837 /* BB should we make this strnlen of PATH_MAX? */
838 len = strnlen(filename, PATH_MAX);
839 }
840
841 /* BB fixme - hash low and high 32 bits if not 64 bit arch BB */
842 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM)
843 *pinum = pFindData->UniqueId;
844 } else if (level == SMB_FIND_FILE_DIRECTORY_INFO) {
845 FILE_DIRECTORY_INFO *pFindData =
846 (FILE_DIRECTORY_INFO *)current_entry;
847 filename = &pFindData->FileName[0];
848 len = le32_to_cpu(pFindData->FileNameLength);
849 } else if (level == SMB_FIND_FILE_FULL_DIRECTORY_INFO) {
850 FILE_FULL_DIRECTORY_INFO *pFindData =
851 (FILE_FULL_DIRECTORY_INFO *)current_entry;
852 filename = &pFindData->FileName[0];
853 len = le32_to_cpu(pFindData->FileNameLength);
854 } else if (level == SMB_FIND_FILE_ID_FULL_DIR_INFO) {
855 SEARCH_ID_FULL_DIR_INFO *pFindData =
856 (SEARCH_ID_FULL_DIR_INFO *)current_entry;
857 filename = &pFindData->FileName[0];
858 len = le32_to_cpu(pFindData->FileNameLength);
859 *pinum = pFindData->UniqueId;
860 } else if (level == SMB_FIND_FILE_BOTH_DIRECTORY_INFO) {
861 FILE_BOTH_DIRECTORY_INFO *pFindData =
862 (FILE_BOTH_DIRECTORY_INFO *)current_entry;
863 filename = &pFindData->FileName[0];
864 len = le32_to_cpu(pFindData->FileNameLength);
865 } else if (level == SMB_FIND_FILE_INFO_STANDARD) {
866 FIND_FILE_STANDARD_INFO *pFindData =
867 (FIND_FILE_STANDARD_INFO *)current_entry;
868 filename = &pFindData->FileName[0];
869 /* one byte length, no name conversion */
870 len = (unsigned int)pFindData->FileNameLength;
871 } else {
872 cFYI(1, ("Unknown findfirst level %d", level));
873 return -EINVAL;
874 }
875
876 if (len > max_len) {
877 cERROR(1, ("bad search response length %d past smb end", len));
878 return -EINVAL;
879 }
880
881 if (unicode) {
882 /* BB fixme - test with long names */
883 /* Note converted filename can be longer than in unicode */
884 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR)
885 pqst->len = cifs_convertUCSpath((char *)pqst->name,
886 (__le16 *)filename, len/2, nlt);
887 else
888 pqst->len = cifs_strfromUCS_le((char *)pqst->name,
889 (__le16 *)filename, len/2, nlt);
890 } else {
891 pqst->name = filename;
892 pqst->len = len;
893 }
894 pqst->hash = full_name_hash(pqst->name, pqst->len);
895 /* cFYI(1, ("filldir on %s",pqst->name)); */
896 return rc;
897 }
898
899 static int cifs_filldir(char *pfindEntry, struct file *file,
900 filldir_t filldir, void *direntry, char *scratch_buf, int max_len)
901 {
902 int rc = 0;
903 struct qstr qstring;
904 struct cifsFileInfo *pCifsF;
905 unsigned int obj_type;
906 ino_t inum;
907 struct cifs_sb_info *cifs_sb;
908 struct inode *tmp_inode;
909 struct dentry *tmp_dentry;
910
911 /* get filename and len into qstring */
912 /* get dentry */
913 /* decide whether to create and populate ionde */
914 if ((direntry == NULL) || (file == NULL))
915 return -EINVAL;
916
917 pCifsF = file->private_data;
918
919 if ((scratch_buf == NULL) || (pfindEntry == NULL) || (pCifsF == NULL))
920 return -ENOENT;
921
922 rc = cifs_entry_is_dot(pfindEntry, pCifsF);
923 /* skip . and .. since we added them first */
924 if (rc != 0)
925 return 0;
926
927 cifs_sb = CIFS_SB(file->f_path.dentry->d_sb);
928
929 qstring.name = scratch_buf;
930 rc = cifs_get_name_from_search_buf(&qstring, pfindEntry,
931 pCifsF->srch_inf.info_level,
932 pCifsF->srch_inf.unicode, cifs_sb,
933 max_len,
934 &inum /* returned */);
935
936 if (rc)
937 return rc;
938
939 rc = construct_dentry(&qstring, file, &tmp_inode, &tmp_dentry);
940 if ((tmp_inode == NULL) || (tmp_dentry == NULL))
941 return -ENOMEM;
942
943 if (rc) {
944 /* inode created, we need to hash it with right inode number */
945 if (inum != 0) {
946 /* BB fixme - hash the 2 32 quantities bits together if
947 * necessary BB */
948 tmp_inode->i_ino = inum;
949 }
950 insert_inode_hash(tmp_inode);
951 }
952
953 /* we pass in rc below, indicating whether it is a new inode,
954 so we can figure out whether to invalidate the inode cached
955 data if the file has changed */
956 if (pCifsF->srch_inf.info_level == SMB_FIND_FILE_UNIX)
957 unix_fill_in_inode(tmp_inode,
958 (FILE_UNIX_INFO *)pfindEntry,
959 &obj_type, rc);
960 else if (pCifsF->srch_inf.info_level == SMB_FIND_FILE_INFO_STANDARD)
961 fill_in_inode(tmp_inode, 0 /* old level 1 buffer type */,
962 pfindEntry, &obj_type, rc);
963 else
964 fill_in_inode(tmp_inode, 1 /* NT */, pfindEntry, &obj_type, rc);
965
966 if (rc) /* new inode - needs to be tied to dentry */ {
967 d_instantiate(tmp_dentry, tmp_inode);
968 if (rc == 2)
969 d_rehash(tmp_dentry);
970 }
971
972
973 rc = filldir(direntry, qstring.name, qstring.len, file->f_pos,
974 tmp_inode->i_ino, obj_type);
975 if (rc) {
976 cFYI(1, ("filldir rc = %d", rc));
977 /* we can not return filldir errors to the caller
978 since they are "normal" when the stat blocksize
979 is too small - we return remapped error instead */
980 rc = -EOVERFLOW;
981 }
982
983 dput(tmp_dentry);
984 return rc;
985 }
986
987
988 int cifs_readdir(struct file *file, void *direntry, filldir_t filldir)
989 {
990 int rc = 0;
991 int xid, i;
992 struct cifs_sb_info *cifs_sb;
993 struct cifsTconInfo *pTcon;
994 struct cifsFileInfo *cifsFile = NULL;
995 char *current_entry;
996 int num_to_fill = 0;
997 char *tmp_buf = NULL;
998 char *end_of_smb;
999 int max_len;
1000
1001 xid = GetXid();
1002
1003 cifs_sb = CIFS_SB(file->f_path.dentry->d_sb);
1004 pTcon = cifs_sb->tcon;
1005 if (pTcon == NULL)
1006 return -EINVAL;
1007
1008 switch ((int) file->f_pos) {
1009 case 0:
1010 if (filldir(direntry, ".", 1, file->f_pos,
1011 file->f_path.dentry->d_inode->i_ino, DT_DIR) < 0) {
1012 cERROR(1, ("Filldir for current dir failed"));
1013 rc = -ENOMEM;
1014 break;
1015 }
1016 file->f_pos++;
1017 case 1:
1018 if (filldir(direntry, "..", 2, file->f_pos,
1019 file->f_path.dentry->d_parent->d_inode->i_ino, DT_DIR) < 0) {
1020 cERROR(1, ("Filldir for parent dir failed"));
1021 rc = -ENOMEM;
1022 break;
1023 }
1024 file->f_pos++;
1025 default:
1026 /* 1) If search is active,
1027 is in current search buffer?
1028 if it before then restart search
1029 if after then keep searching till find it */
1030
1031 if (file->private_data == NULL) {
1032 rc = initiate_cifs_search(xid, file);
1033 cFYI(1, ("initiate cifs search rc %d", rc));
1034 if (rc) {
1035 FreeXid(xid);
1036 return rc;
1037 }
1038 }
1039 if (file->private_data == NULL) {
1040 rc = -EINVAL;
1041 FreeXid(xid);
1042 return rc;
1043 }
1044 cifsFile = file->private_data;
1045 if (cifsFile->srch_inf.endOfSearch) {
1046 if (cifsFile->srch_inf.emptyDir) {
1047 cFYI(1, ("End of search, empty dir"));
1048 rc = 0;
1049 break;
1050 }
1051 } /* else {
1052 cifsFile->invalidHandle = true;
1053 CIFSFindClose(xid, pTcon, cifsFile->netfid);
1054 } */
1055
1056 rc = find_cifs_entry(xid, pTcon, file,
1057 &current_entry, &num_to_fill);
1058 if (rc) {
1059 cFYI(1, ("fce error %d", rc));
1060 goto rddir2_exit;
1061 } else if (current_entry != NULL) {
1062 cFYI(1, ("entry %lld found", file->f_pos));
1063 } else {
1064 cFYI(1, ("could not find entry"));
1065 goto rddir2_exit;
1066 }
1067 cFYI(1, ("loop through %d times filling dir for net buf %p",
1068 num_to_fill, cifsFile->srch_inf.ntwrk_buf_start));
1069 max_len = smbCalcSize((struct smb_hdr *)
1070 cifsFile->srch_inf.ntwrk_buf_start);
1071 end_of_smb = cifsFile->srch_inf.ntwrk_buf_start + max_len;
1072
1073 /* To be safe - for UCS to UTF-8 with strings loaded
1074 with the rare long characters alloc more to account for
1075 such multibyte target UTF-8 characters. cifs_unicode.c,
1076 which actually does the conversion, has the same limit */
1077 tmp_buf = kmalloc((2 * NAME_MAX) + 4, GFP_KERNEL);
1078 for (i = 0; (i < num_to_fill) && (rc == 0); i++) {
1079 if (current_entry == NULL) {
1080 /* evaluate whether this case is an error */
1081 cERROR(1, ("past SMB end, num to fill %d i %d",
1082 num_to_fill, i));
1083 break;
1084 }
1085 /* if buggy server returns . and .. late do
1086 we want to check for that here? */
1087 rc = cifs_filldir(current_entry, file,
1088 filldir, direntry, tmp_buf, max_len);
1089 if (rc == -EOVERFLOW) {
1090 rc = 0;
1091 break;
1092 }
1093
1094 file->f_pos++;
1095 if (file->f_pos ==
1096 cifsFile->srch_inf.index_of_last_entry) {
1097 cFYI(1, ("last entry in buf at pos %lld %s",
1098 file->f_pos, tmp_buf));
1099 cifs_save_resume_key(current_entry, cifsFile);
1100 break;
1101 } else
1102 current_entry =
1103 nxt_dir_entry(current_entry, end_of_smb,
1104 cifsFile->srch_inf.info_level);
1105 }
1106 kfree(tmp_buf);
1107 break;
1108 } /* end switch */
1109
1110 rddir2_exit:
1111 FreeXid(xid);
1112 return rc;
1113 }
Linux kernel - Deliverables
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