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mempolicy: mPOL_PREFERRED cleanups for "local allocation"
[linux-2.6/kvm.git] / fs / cifs / readdir.c
blob32b445edc88282d2ce55ab1bd5a8f7bc2b9d7b3d
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
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 #ifdef CONFIG_CIFS_EXPERIMENTAL
176 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_CIFS_ACL) {
177 /* get more accurate mode via ACL - so force inode refresh */
178 cifsInfo->time = 0;
179 } else
180 #endif /* CONFIG_CIFS_EXPERIMENTAL */
181 cifsInfo->time = jiffies;
182
183 /* treat dos attribute of read-only as read-only mode bit e.g. 555? */
184 /* 2767 perms - indicate mandatory locking */
185 /* BB fill in uid and gid here? with help from winbind?
186 or retrieve from NTFS stream extended attribute */
187 if (atomic_read(&cifsInfo->inUse) == 0) {
188 tmp_inode->i_uid = cifs_sb->mnt_uid;
189 tmp_inode->i_gid = cifs_sb->mnt_gid;
190 /* set default mode. will override for dirs below */
191 tmp_inode->i_mode = cifs_sb->mnt_file_mode;
192 } else {
193 /* mask off the type bits since it gets set
194 below and we do not want to get two type
195 bits set */
196 tmp_inode->i_mode &= ~S_IFMT;
197 }
198
199 if (attr & ATTR_DIRECTORY) {
200 *pobject_type = DT_DIR;
201 /* override default perms since we do not lock dirs */
202 if (atomic_read(&cifsInfo->inUse) == 0)
203 tmp_inode->i_mode = cifs_sb->mnt_dir_mode;
204 tmp_inode->i_mode |= S_IFDIR;
205 } else if ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_UNX_EMUL) &&
206 (attr & ATTR_SYSTEM)) {
207 if (end_of_file == 0) {
208 *pobject_type = DT_FIFO;
209 tmp_inode->i_mode |= S_IFIFO;
210 } else {
211 /* rather than get the type here, we mark the
212 inode as needing revalidate and get the real type
213 (blk vs chr vs. symlink) later ie in lookup */
214 *pobject_type = DT_REG;
215 tmp_inode->i_mode |= S_IFREG;
216 cifsInfo->time = 0;
217 }
218 /* we no longer mark these because we could not follow them */
219 /* } else if (attr & ATTR_REPARSE) {
220 *pobject_type = DT_LNK;
221 tmp_inode->i_mode |= S_IFLNK; */
222 } else {
223 *pobject_type = DT_REG;
224 tmp_inode->i_mode |= S_IFREG;
225 if (attr & ATTR_READONLY)
226 tmp_inode->i_mode &= ~(S_IWUGO);
227 else if ((tmp_inode->i_mode & S_IWUGO) == 0)
228 /* the ATTR_READONLY flag may have been changed on */
229 /* server -- set any w bits allowed by mnt_file_mode */
230 tmp_inode->i_mode |= (S_IWUGO & cifs_sb->mnt_file_mode);
231 } /* could add code here - to validate if device or weird share type? */
232
233 /* can not fill in nlink here as in qpathinfo version and Unx search */
234 if (atomic_read(&cifsInfo->inUse) == 0)
235 atomic_set(&cifsInfo->inUse, 1);
236
237 spin_lock(&tmp_inode->i_lock);
238 if (is_size_safe_to_change(cifsInfo, end_of_file)) {
239 /* can not safely change the file size here if the
240 client is writing to it due to potential races */
241 i_size_write(tmp_inode, end_of_file);
242
243 /* 512 bytes (2**9) is the fake blocksize that must be used */
244 /* for this calculation, even though the reported blocksize is larger */
245 tmp_inode->i_blocks = (512 - 1 + allocation_size) >> 9;
246 }
247 spin_unlock(&tmp_inode->i_lock);
248
249 if (allocation_size < end_of_file)
250 cFYI(1, ("May be sparse file, allocation less than file size"));
251 cFYI(1, ("File Size %ld and blocks %llu",
252 (unsigned long)tmp_inode->i_size,
253 (unsigned long long)tmp_inode->i_blocks));
254 if (S_ISREG(tmp_inode->i_mode)) {
255 cFYI(1, ("File inode"));
256 tmp_inode->i_op = &cifs_file_inode_ops;
257 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DIRECT_IO) {
258 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_BRL)
259 tmp_inode->i_fop = &cifs_file_direct_nobrl_ops;
260 else
261 tmp_inode->i_fop = &cifs_file_direct_ops;
262 } else if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_BRL)
263 tmp_inode->i_fop = &cifs_file_nobrl_ops;
264 else
265 tmp_inode->i_fop = &cifs_file_ops;
266
267 if ((cifs_sb->tcon) && (cifs_sb->tcon->ses) &&
268 (cifs_sb->tcon->ses->server->maxBuf <
269 PAGE_CACHE_SIZE + MAX_CIFS_HDR_SIZE))
270 tmp_inode->i_data.a_ops = &cifs_addr_ops_smallbuf;
271 else
272 tmp_inode->i_data.a_ops = &cifs_addr_ops;
273
274 if (isNewInode)
275 return; /* No sense invalidating pages for new inode
276 since have not started caching readahead file
277 data yet */
278
279 if (timespec_equal(&tmp_inode->i_mtime, &local_mtime) &&
280 (local_size == tmp_inode->i_size)) {
281 cFYI(1, ("inode exists but unchanged"));
282 } else {
283 /* file may have changed on server */
284 cFYI(1, ("invalidate inode, readdir detected change"));
285 invalidate_remote_inode(tmp_inode);
286 }
287 } else if (S_ISDIR(tmp_inode->i_mode)) {
288 cFYI(1, ("Directory inode"));
289 tmp_inode->i_op = &cifs_dir_inode_ops;
290 tmp_inode->i_fop = &cifs_dir_ops;
291 } else if (S_ISLNK(tmp_inode->i_mode)) {
292 cFYI(1, ("Symbolic Link inode"));
293 tmp_inode->i_op = &cifs_symlink_inode_ops;
294 } else {
295 cFYI(1, ("Init special inode"));
296 init_special_inode(tmp_inode, tmp_inode->i_mode,
297 tmp_inode->i_rdev);
298 }
299 }
300
301 static void unix_fill_in_inode(struct inode *tmp_inode,
302 FILE_UNIX_INFO *pfindData, unsigned int *pobject_type, int isNewInode)
303 {
304 loff_t local_size;
305 struct timespec local_mtime;
306
307 struct cifsInodeInfo *cifsInfo = CIFS_I(tmp_inode);
308 struct cifs_sb_info *cifs_sb = CIFS_SB(tmp_inode->i_sb);
309
310 __u32 type = le32_to_cpu(pfindData->Type);
311 __u64 num_of_bytes = le64_to_cpu(pfindData->NumOfBytes);
312 __u64 end_of_file = le64_to_cpu(pfindData->EndOfFile);
313 cifsInfo->time = jiffies;
314 atomic_inc(&cifsInfo->inUse);
315
316 /* save mtime and size */
317 local_mtime = tmp_inode->i_mtime;
318 local_size = tmp_inode->i_size;
319
320 tmp_inode->i_atime =
321 cifs_NTtimeToUnix(le64_to_cpu(pfindData->LastAccessTime));
322 tmp_inode->i_mtime =
323 cifs_NTtimeToUnix(le64_to_cpu(pfindData->LastModificationTime));
324 tmp_inode->i_ctime =
325 cifs_NTtimeToUnix(le64_to_cpu(pfindData->LastStatusChange));
326
327 tmp_inode->i_mode = le64_to_cpu(pfindData->Permissions);
328 /* since we set the inode type below we need to mask off type
329 to avoid strange results if bits above were corrupt */
330 tmp_inode->i_mode &= ~S_IFMT;
331 if (type == UNIX_FILE) {
332 *pobject_type = DT_REG;
333 tmp_inode->i_mode |= S_IFREG;
334 } else if (type == UNIX_SYMLINK) {
335 *pobject_type = DT_LNK;
336 tmp_inode->i_mode |= S_IFLNK;
337 } else if (type == UNIX_DIR) {
338 *pobject_type = DT_DIR;
339 tmp_inode->i_mode |= S_IFDIR;
340 } else if (type == UNIX_CHARDEV) {
341 *pobject_type = DT_CHR;
342 tmp_inode->i_mode |= S_IFCHR;
343 tmp_inode->i_rdev = MKDEV(le64_to_cpu(pfindData->DevMajor),
344 le64_to_cpu(pfindData->DevMinor) & MINORMASK);
345 } else if (type == UNIX_BLOCKDEV) {
346 *pobject_type = DT_BLK;
347 tmp_inode->i_mode |= S_IFBLK;
348 tmp_inode->i_rdev = MKDEV(le64_to_cpu(pfindData->DevMajor),
349 le64_to_cpu(pfindData->DevMinor) & MINORMASK);
350 } else if (type == UNIX_FIFO) {
351 *pobject_type = DT_FIFO;
352 tmp_inode->i_mode |= S_IFIFO;
353 } else if (type == UNIX_SOCKET) {
354 *pobject_type = DT_SOCK;
355 tmp_inode->i_mode |= S_IFSOCK;
356 } else {
357 /* safest to just call it a file */
358 *pobject_type = DT_REG;
359 tmp_inode->i_mode |= S_IFREG;
360 cFYI(1, ("unknown inode type %d", type));
361 }
362
363 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_OVERR_UID)
364 tmp_inode->i_uid = cifs_sb->mnt_uid;
365 else
366 tmp_inode->i_uid = le64_to_cpu(pfindData->Uid);
367 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_OVERR_GID)
368 tmp_inode->i_gid = cifs_sb->mnt_gid;
369 else
370 tmp_inode->i_gid = le64_to_cpu(pfindData->Gid);
371 tmp_inode->i_nlink = le64_to_cpu(pfindData->Nlinks);
372
373 spin_lock(&tmp_inode->i_lock);
374 if (is_size_safe_to_change(cifsInfo, end_of_file)) {
375 /* can not safely change the file size here if the
376 client is writing to it due to potential races */
377 i_size_write(tmp_inode, end_of_file);
378
379 /* 512 bytes (2**9) is the fake blocksize that must be used */
380 /* for this calculation, not the real blocksize */
381 tmp_inode->i_blocks = (512 - 1 + num_of_bytes) >> 9;
382 }
383 spin_unlock(&tmp_inode->i_lock);
384
385 if (S_ISREG(tmp_inode->i_mode)) {
386 cFYI(1, ("File inode"));
387 tmp_inode->i_op = &cifs_file_inode_ops;
388
389 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DIRECT_IO) {
390 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_BRL)
391 tmp_inode->i_fop = &cifs_file_direct_nobrl_ops;
392 else
393 tmp_inode->i_fop = &cifs_file_direct_ops;
394 } else if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_BRL)
395 tmp_inode->i_fop = &cifs_file_nobrl_ops;
396 else
397 tmp_inode->i_fop = &cifs_file_ops;
398
399 if ((cifs_sb->tcon) && (cifs_sb->tcon->ses) &&
400 (cifs_sb->tcon->ses->server->maxBuf <
401 PAGE_CACHE_SIZE + MAX_CIFS_HDR_SIZE))
402 tmp_inode->i_data.a_ops = &cifs_addr_ops_smallbuf;
403 else
404 tmp_inode->i_data.a_ops = &cifs_addr_ops;
405
406 if (isNewInode)
407 return; /* No sense invalidating pages for new inode
408 since we have not started caching readahead
409 file data for it yet */
410
411 if (timespec_equal(&tmp_inode->i_mtime, &local_mtime) &&
412 (local_size == tmp_inode->i_size)) {
413 cFYI(1, ("inode exists but unchanged"));
414 } else {
415 /* file may have changed on server */
416 cFYI(1, ("invalidate inode, readdir detected change"));
417 invalidate_remote_inode(tmp_inode);
418 }
419 } else if (S_ISDIR(tmp_inode->i_mode)) {
420 cFYI(1, ("Directory inode"));
421 tmp_inode->i_op = &cifs_dir_inode_ops;
422 tmp_inode->i_fop = &cifs_dir_ops;
423 } else if (S_ISLNK(tmp_inode->i_mode)) {
424 cFYI(1, ("Symbolic Link inode"));
425 tmp_inode->i_op = &cifs_symlink_inode_ops;
426 /* tmp_inode->i_fop = *//* do not need to set to anything */
427 } else {
428 cFYI(1, ("Special inode"));
429 init_special_inode(tmp_inode, tmp_inode->i_mode,
430 tmp_inode->i_rdev);
431 }
432 }
433
434 static int initiate_cifs_search(const int xid, struct file *file)
435 {
436 int rc = 0;
437 char *full_path;
438 struct cifsFileInfo *cifsFile;
439 struct cifs_sb_info *cifs_sb;
440 struct cifsTconInfo *pTcon;
441
442 if (file->private_data == NULL) {
443 file->private_data =
444 kzalloc(sizeof(struct cifsFileInfo), GFP_KERNEL);
445 }
446
447 if (file->private_data == NULL)
448 return -ENOMEM;
449 cifsFile = file->private_data;
450 cifsFile->invalidHandle = TRUE;
451 cifsFile->srch_inf.endOfSearch = FALSE;
452
453 cifs_sb = CIFS_SB(file->f_path.dentry->d_sb);
454 if (cifs_sb == NULL)
455 return -EINVAL;
456
457 pTcon = cifs_sb->tcon;
458 if (pTcon == NULL)
459 return -EINVAL;
460
461 full_path = build_path_from_dentry(file->f_path.dentry);
462
463 if (full_path == NULL)
464 return -ENOMEM;
465
466 cFYI(1, ("Full path: %s start at: %lld", full_path, file->f_pos));
467
468 ffirst_retry:
469 /* test for Unix extensions */
470 /* but now check for them on the share/mount not on the SMB session */
471 /* if (pTcon->ses->capabilities & CAP_UNIX) { */
472 if (pTcon->unix_ext)
473 cifsFile->srch_inf.info_level = SMB_FIND_FILE_UNIX;
474 else if ((pTcon->ses->capabilities &
475 (CAP_NT_SMBS | CAP_NT_FIND)) == 0) {
476 cifsFile->srch_inf.info_level = SMB_FIND_FILE_INFO_STANDARD;
477 } else if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM) {
478 cifsFile->srch_inf.info_level = SMB_FIND_FILE_ID_FULL_DIR_INFO;
479 } else /* not srvinos - BB fixme add check for backlevel? */ {
480 cifsFile->srch_inf.info_level = SMB_FIND_FILE_DIRECTORY_INFO;
481 }
482
483 rc = CIFSFindFirst(xid, pTcon, full_path, cifs_sb->local_nls,
484 &cifsFile->netfid, &cifsFile->srch_inf,
485 cifs_sb->mnt_cifs_flags &
486 CIFS_MOUNT_MAP_SPECIAL_CHR, CIFS_DIR_SEP(cifs_sb));
487 if (rc == 0)
488 cifsFile->invalidHandle = FALSE;
489 if ((rc == -EOPNOTSUPP) &&
490 (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM)) {
491 cifs_sb->mnt_cifs_flags &= ~CIFS_MOUNT_SERVER_INUM;
492 goto ffirst_retry;
493 }
494 kfree(full_path);
495 return rc;
496 }
497
498 /* return length of unicode string in bytes */
499 static int cifs_unicode_bytelen(char *str)
500 {
501 int len;
502 __le16 *ustr = (__le16 *)str;
503
504 for (len = 0; len <= PATH_MAX; len++) {
505 if (ustr[len] == 0)
506 return len << 1;
507 }
508 cFYI(1, ("Unicode string longer than PATH_MAX found"));
509 return len << 1;
510 }
511
512 static char *nxt_dir_entry(char *old_entry, char *end_of_smb, int level)
513 {
514 char *new_entry;
515 FILE_DIRECTORY_INFO *pDirInfo = (FILE_DIRECTORY_INFO *)old_entry;
516
517 if (level == SMB_FIND_FILE_INFO_STANDARD) {
518 FIND_FILE_STANDARD_INFO *pfData;
519 pfData = (FIND_FILE_STANDARD_INFO *)pDirInfo;
520
521 new_entry = old_entry + sizeof(FIND_FILE_STANDARD_INFO) +
522 pfData->FileNameLength;
523 } else
524 new_entry = old_entry + le32_to_cpu(pDirInfo->NextEntryOffset);
525 cFYI(1, ("new entry %p old entry %p", new_entry, old_entry));
526 /* validate that new_entry is not past end of SMB */
527 if (new_entry >= end_of_smb) {
528 cERROR(1,
529 ("search entry %p began after end of SMB %p old entry %p",
530 new_entry, end_of_smb, old_entry));
531 return NULL;
532 } else if (((level == SMB_FIND_FILE_INFO_STANDARD) &&
533 (new_entry + sizeof(FIND_FILE_STANDARD_INFO) > end_of_smb))
534 || ((level != SMB_FIND_FILE_INFO_STANDARD) &&
535 (new_entry + sizeof(FILE_DIRECTORY_INFO) > end_of_smb))) {
536 cERROR(1, ("search entry %p extends after end of SMB %p",
537 new_entry, end_of_smb));
538 return NULL;
539 } else
540 return new_entry;
541
542 }
543
544 #define UNICODE_DOT cpu_to_le16(0x2e)
545
546 /* return 0 if no match and 1 for . (current directory) and 2 for .. (parent) */
547 static int cifs_entry_is_dot(char *current_entry, struct cifsFileInfo *cfile)
548 {
549 int rc = 0;
550 char *filename = NULL;
551 int len = 0;
552
553 if (cfile->srch_inf.info_level == SMB_FIND_FILE_UNIX) {
554 FILE_UNIX_INFO *pFindData = (FILE_UNIX_INFO *)current_entry;
555 filename = &pFindData->FileName[0];
556 if (cfile->srch_inf.unicode) {
557 len = cifs_unicode_bytelen(filename);
558 } else {
559 /* BB should we make this strnlen of PATH_MAX? */
560 len = strnlen(filename, 5);
561 }
562 } else if (cfile->srch_inf.info_level == SMB_FIND_FILE_DIRECTORY_INFO) {
563 FILE_DIRECTORY_INFO *pFindData =
564 (FILE_DIRECTORY_INFO *)current_entry;
565 filename = &pFindData->FileName[0];
566 len = le32_to_cpu(pFindData->FileNameLength);
567 } else if (cfile->srch_inf.info_level ==
568 SMB_FIND_FILE_FULL_DIRECTORY_INFO) {
569 FILE_FULL_DIRECTORY_INFO *pFindData =
570 (FILE_FULL_DIRECTORY_INFO *)current_entry;
571 filename = &pFindData->FileName[0];
572 len = le32_to_cpu(pFindData->FileNameLength);
573 } else if (cfile->srch_inf.info_level ==
574 SMB_FIND_FILE_ID_FULL_DIR_INFO) {
575 SEARCH_ID_FULL_DIR_INFO *pFindData =
576 (SEARCH_ID_FULL_DIR_INFO *)current_entry;
577 filename = &pFindData->FileName[0];
578 len = le32_to_cpu(pFindData->FileNameLength);
579 } else if (cfile->srch_inf.info_level ==
580 SMB_FIND_FILE_BOTH_DIRECTORY_INFO) {
581 FILE_BOTH_DIRECTORY_INFO *pFindData =
582 (FILE_BOTH_DIRECTORY_INFO *)current_entry;
583 filename = &pFindData->FileName[0];
584 len = le32_to_cpu(pFindData->FileNameLength);
585 } else if (cfile->srch_inf.info_level == SMB_FIND_FILE_INFO_STANDARD) {
586 FIND_FILE_STANDARD_INFO *pFindData =
587 (FIND_FILE_STANDARD_INFO *)current_entry;
588 filename = &pFindData->FileName[0];
589 len = pFindData->FileNameLength;
590 } else {
591 cFYI(1, ("Unknown findfirst level %d",
592 cfile->srch_inf.info_level));
593 }
594
595 if (filename) {
596 if (cfile->srch_inf.unicode) {
597 __le16 *ufilename = (__le16 *)filename;
598 if (len == 2) {
599 /* check for . */
600 if (ufilename[0] == UNICODE_DOT)
601 rc = 1;
602 } else if (len == 4) {
603 /* check for .. */
604 if ((ufilename[0] == UNICODE_DOT)
605 && (ufilename[1] == UNICODE_DOT))
606 rc = 2;
607 }
608 } else /* ASCII */ {
609 if (len == 1) {
610 if (filename[0] == '.')
611 rc = 1;
612 } else if (len == 2) {
613 if ((filename[0] == '.') && (filename[1] == '.'))
614 rc = 2;
615 }
616 }
617 }
618
619 return rc;
620 }
621
622 /* Check if directory that we are searching has changed so we can decide
623 whether we can use the cached search results from the previous search */
624 static int is_dir_changed(struct file *file)
625 {
626 struct inode *inode = file->f_path.dentry->d_inode;
627 struct cifsInodeInfo *cifsInfo = CIFS_I(inode);
628
629 if (cifsInfo->time == 0)
630 return 1; /* directory was changed, perhaps due to unlink */
631 else
632 return 0;
633
634 }
635
636 /* find the corresponding entry in the search */
637 /* Note that the SMB server returns search entries for . and .. which
638 complicates logic here if we choose to parse for them and we do not
639 assume that they are located in the findfirst return buffer.*/
640 /* We start counting in the buffer with entry 2 and increment for every
641 entry (do not increment for . or .. entry) */
642 static int find_cifs_entry(const int xid, struct cifsTconInfo *pTcon,
643 struct file *file, char **ppCurrentEntry, int *num_to_ret)
644 {
645 int rc = 0;
646 int pos_in_buf = 0;
647 loff_t first_entry_in_buffer;
648 loff_t index_to_find = file->f_pos;
649 struct cifsFileInfo *cifsFile = file->private_data;
650 /* check if index in the buffer */
651
652 if ((cifsFile == NULL) || (ppCurrentEntry == NULL) ||
653 (num_to_ret == NULL))
654 return -ENOENT;
655
656 *ppCurrentEntry = NULL;
657 first_entry_in_buffer =
658 cifsFile->srch_inf.index_of_last_entry -
659 cifsFile->srch_inf.entries_in_buffer;
660
661 /* if first entry in buf is zero then is first buffer
662 in search response data which means it is likely . and ..
663 will be in this buffer, although some servers do not return
664 . and .. for the root of a drive and for those we need
665 to start two entries earlier */
666
667 dump_cifs_file_struct(file, "In fce ");
668 if (((index_to_find < cifsFile->srch_inf.index_of_last_entry) &&
669 is_dir_changed(file)) ||
670 (index_to_find < first_entry_in_buffer)) {
671 /* close and restart search */
672 cFYI(1, ("search backing up - close and restart search"));
673 cifsFile->invalidHandle = TRUE;
674 CIFSFindClose(xid, pTcon, cifsFile->netfid);
675 kfree(cifsFile->search_resume_name);
676 cifsFile->search_resume_name = NULL;
677 if (cifsFile->srch_inf.ntwrk_buf_start) {
678 cFYI(1, ("freeing SMB ff cache buf on search rewind"));
679 if (cifsFile->srch_inf.smallBuf)
680 cifs_small_buf_release(cifsFile->srch_inf.
681 ntwrk_buf_start);
682 else
683 cifs_buf_release(cifsFile->srch_inf.
684 ntwrk_buf_start);
685 }
686 rc = initiate_cifs_search(xid, file);
687 if (rc) {
688 cFYI(1, ("error %d reinitiating a search on rewind",
689 rc));
690 return rc;
691 }
692 }
693
694 while ((index_to_find >= cifsFile->srch_inf.index_of_last_entry) &&
695 (rc == 0) && (cifsFile->srch_inf.endOfSearch == FALSE)) {
696 cFYI(1, ("calling findnext2"));
697 rc = CIFSFindNext(xid, pTcon, cifsFile->netfid,
698 &cifsFile->srch_inf);
699 if (rc)
700 return -ENOENT;
701 }
702 if (index_to_find < cifsFile->srch_inf.index_of_last_entry) {
703 /* we found the buffer that contains the entry */
704 /* scan and find it */
705 int i;
706 char *current_entry;
707 char *end_of_smb = cifsFile->srch_inf.ntwrk_buf_start +
708 smbCalcSize((struct smb_hdr *)
709 cifsFile->srch_inf.ntwrk_buf_start);
710
711 current_entry = cifsFile->srch_inf.srch_entries_start;
712 first_entry_in_buffer = cifsFile->srch_inf.index_of_last_entry
713 - cifsFile->srch_inf.entries_in_buffer;
714 pos_in_buf = index_to_find - first_entry_in_buffer;
715 cFYI(1, ("found entry - pos_in_buf %d", pos_in_buf));
716
717 for (i = 0; (i < (pos_in_buf)) && (current_entry != NULL); i++) {
718 /* go entry by entry figuring out which is first */
719 current_entry = nxt_dir_entry(current_entry, end_of_smb,
720 cifsFile->srch_inf.info_level);
721 }
722 if ((current_entry == NULL) && (i < pos_in_buf)) {
723 /* BB fixme - check if we should flag this error */
724 cERROR(1, ("reached end of buf searching for pos in buf"
725 " %d index to find %lld rc %d",
726 pos_in_buf, index_to_find, rc));
727 }
728 rc = 0;
729 *ppCurrentEntry = current_entry;
730 } else {
731 cFYI(1, ("index not in buffer - could not findnext into it"));
732 return 0;
733 }
734
735 if (pos_in_buf >= cifsFile->srch_inf.entries_in_buffer) {
736 cFYI(1, ("can not return entries pos_in_buf beyond last"));
737 *num_to_ret = 0;
738 } else
739 *num_to_ret = cifsFile->srch_inf.entries_in_buffer - pos_in_buf;
740
741 return rc;
742 }
743
744 /* inode num, inode type and filename returned */
745 static int cifs_get_name_from_search_buf(struct qstr *pqst,
746 char *current_entry, __u16 level, unsigned int unicode,
747 struct cifs_sb_info *cifs_sb, int max_len, ino_t *pinum)
748 {
749 int rc = 0;
750 unsigned int len = 0;
751 char *filename;
752 struct nls_table *nlt = cifs_sb->local_nls;
753
754 *pinum = 0;
755
756 if (level == SMB_FIND_FILE_UNIX) {
757 FILE_UNIX_INFO *pFindData = (FILE_UNIX_INFO *)current_entry;
758
759 filename = &pFindData->FileName[0];
760 if (unicode) {
761 len = cifs_unicode_bytelen(filename);
762 } else {
763 /* BB should we make this strnlen of PATH_MAX? */
764 len = strnlen(filename, PATH_MAX);
765 }
766
767 /* BB fixme - hash low and high 32 bits if not 64 bit arch BB */
768 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM)
769 *pinum = pFindData->UniqueId;
770 } else if (level == SMB_FIND_FILE_DIRECTORY_INFO) {
771 FILE_DIRECTORY_INFO *pFindData =
772 (FILE_DIRECTORY_INFO *)current_entry;
773 filename = &pFindData->FileName[0];
774 len = le32_to_cpu(pFindData->FileNameLength);
775 } else if (level == SMB_FIND_FILE_FULL_DIRECTORY_INFO) {
776 FILE_FULL_DIRECTORY_INFO *pFindData =
777 (FILE_FULL_DIRECTORY_INFO *)current_entry;
778 filename = &pFindData->FileName[0];
779 len = le32_to_cpu(pFindData->FileNameLength);
780 } else if (level == SMB_FIND_FILE_ID_FULL_DIR_INFO) {
781 SEARCH_ID_FULL_DIR_INFO *pFindData =
782 (SEARCH_ID_FULL_DIR_INFO *)current_entry;
783 filename = &pFindData->FileName[0];
784 len = le32_to_cpu(pFindData->FileNameLength);
785 *pinum = pFindData->UniqueId;
786 } else if (level == SMB_FIND_FILE_BOTH_DIRECTORY_INFO) {
787 FILE_BOTH_DIRECTORY_INFO *pFindData =
788 (FILE_BOTH_DIRECTORY_INFO *)current_entry;
789 filename = &pFindData->FileName[0];
790 len = le32_to_cpu(pFindData->FileNameLength);
791 } else if (level == SMB_FIND_FILE_INFO_STANDARD) {
792 FIND_FILE_STANDARD_INFO *pFindData =
793 (FIND_FILE_STANDARD_INFO *)current_entry;
794 filename = &pFindData->FileName[0];
795 /* one byte length, no name conversion */
796 len = (unsigned int)pFindData->FileNameLength;
797 } else {
798 cFYI(1, ("Unknown findfirst level %d", level));
799 return -EINVAL;
800 }
801
802 if (len > max_len) {
803 cERROR(1, ("bad search response length %d past smb end", len));
804 return -EINVAL;
805 }
806
807 if (unicode) {
808 /* BB fixme - test with long names */
809 /* Note converted filename can be longer than in unicode */
810 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR)
811 pqst->len = cifs_convertUCSpath((char *)pqst->name,
812 (__le16 *)filename, len/2, nlt);
813 else
814 pqst->len = cifs_strfromUCS_le((char *)pqst->name,
815 (__le16 *)filename, len/2, nlt);
816 } else {
817 pqst->name = filename;
818 pqst->len = len;
819 }
820 pqst->hash = full_name_hash(pqst->name, pqst->len);
821 /* cFYI(1, ("filldir on %s",pqst->name)); */
822 return rc;
823 }
824
825 static int cifs_filldir(char *pfindEntry, struct file *file,
826 filldir_t filldir, void *direntry, char *scratch_buf, int max_len)
827 {
828 int rc = 0;
829 struct qstr qstring;
830 struct cifsFileInfo *pCifsF;
831 unsigned int obj_type;
832 ino_t inum;
833 struct cifs_sb_info *cifs_sb;
834 struct inode *tmp_inode;
835 struct dentry *tmp_dentry;
836
837 /* get filename and len into qstring */
838 /* get dentry */
839 /* decide whether to create and populate ionde */
840 if ((direntry == NULL) || (file == NULL))
841 return -EINVAL;
842
843 pCifsF = file->private_data;
844
845 if ((scratch_buf == NULL) || (pfindEntry == NULL) || (pCifsF == NULL))
846 return -ENOENT;
847
848 rc = cifs_entry_is_dot(pfindEntry, pCifsF);
849 /* skip . and .. since we added them first */
850 if (rc != 0)
851 return 0;
852
853 cifs_sb = CIFS_SB(file->f_path.dentry->d_sb);
854
855 qstring.name = scratch_buf;
856 rc = cifs_get_name_from_search_buf(&qstring, pfindEntry,
857 pCifsF->srch_inf.info_level,
858 pCifsF->srch_inf.unicode, cifs_sb,
859 max_len,
860 &inum /* returned */);
861
862 if (rc)
863 return rc;
864
865 rc = construct_dentry(&qstring, file, &tmp_inode, &tmp_dentry);
866 if ((tmp_inode == NULL) || (tmp_dentry == NULL))
867 return -ENOMEM;
868
869 if (rc) {
870 /* inode created, we need to hash it with right inode number */
871 if (inum != 0) {
872 /* BB fixme - hash the 2 32 quantities bits together if
873 * necessary BB */
874 tmp_inode->i_ino = inum;
875 }
876 insert_inode_hash(tmp_inode);
877 }
878
879 /* we pass in rc below, indicating whether it is a new inode,
880 so we can figure out whether to invalidate the inode cached
881 data if the file has changed */
882 if (pCifsF->srch_inf.info_level == SMB_FIND_FILE_UNIX)
883 unix_fill_in_inode(tmp_inode,
884 (FILE_UNIX_INFO *)pfindEntry,
885 &obj_type, rc);
886 else if (pCifsF->srch_inf.info_level == SMB_FIND_FILE_INFO_STANDARD)
887 fill_in_inode(tmp_inode, 0 /* old level 1 buffer type */,
888 pfindEntry, &obj_type, rc);
889 else
890 fill_in_inode(tmp_inode, 1 /* NT */, pfindEntry, &obj_type, rc);
891
892 if (rc) /* new inode - needs to be tied to dentry */ {
893 d_instantiate(tmp_dentry, tmp_inode);
894 if (rc == 2)
895 d_rehash(tmp_dentry);
896 }
897
898
899 rc = filldir(direntry, qstring.name, qstring.len, file->f_pos,
900 tmp_inode->i_ino, obj_type);
901 if (rc) {
902 cFYI(1, ("filldir rc = %d", rc));
903 /* we can not return filldir errors to the caller
904 since they are "normal" when the stat blocksize
905 is too small - we return remapped error instead */
906 rc = -EOVERFLOW;
907 }
908
909 dput(tmp_dentry);
910 return rc;
911 }
912
913 static int cifs_save_resume_key(const char *current_entry,
914 struct cifsFileInfo *cifsFile)
915 {
916 int rc = 0;
917 unsigned int len = 0;
918 __u16 level;
919 char *filename;
920
921 if ((cifsFile == NULL) || (current_entry == NULL))
922 return -EINVAL;
923
924 level = cifsFile->srch_inf.info_level;
925
926 if (level == SMB_FIND_FILE_UNIX) {
927 FILE_UNIX_INFO *pFindData = (FILE_UNIX_INFO *)current_entry;
928
929 filename = &pFindData->FileName[0];
930 if (cifsFile->srch_inf.unicode) {
931 len = cifs_unicode_bytelen(filename);
932 } else {
933 /* BB should we make this strnlen of PATH_MAX? */
934 len = strnlen(filename, PATH_MAX);
935 }
936 cifsFile->srch_inf.resume_key = pFindData->ResumeKey;
937 } else if (level == SMB_FIND_FILE_DIRECTORY_INFO) {
938 FILE_DIRECTORY_INFO *pFindData =
939 (FILE_DIRECTORY_INFO *)current_entry;
940 filename = &pFindData->FileName[0];
941 len = le32_to_cpu(pFindData->FileNameLength);
942 cifsFile->srch_inf.resume_key = pFindData->FileIndex;
943 } else if (level == SMB_FIND_FILE_FULL_DIRECTORY_INFO) {
944 FILE_FULL_DIRECTORY_INFO *pFindData =
945 (FILE_FULL_DIRECTORY_INFO *)current_entry;
946 filename = &pFindData->FileName[0];
947 len = le32_to_cpu(pFindData->FileNameLength);
948 cifsFile->srch_inf.resume_key = pFindData->FileIndex;
949 } else if (level == SMB_FIND_FILE_ID_FULL_DIR_INFO) {
950 SEARCH_ID_FULL_DIR_INFO *pFindData =
951 (SEARCH_ID_FULL_DIR_INFO *)current_entry;
952 filename = &pFindData->FileName[0];
953 len = le32_to_cpu(pFindData->FileNameLength);
954 cifsFile->srch_inf.resume_key = pFindData->FileIndex;
955 } else if (level == SMB_FIND_FILE_BOTH_DIRECTORY_INFO) {
956 FILE_BOTH_DIRECTORY_INFO *pFindData =
957 (FILE_BOTH_DIRECTORY_INFO *)current_entry;
958 filename = &pFindData->FileName[0];
959 len = le32_to_cpu(pFindData->FileNameLength);
960 cifsFile->srch_inf.resume_key = pFindData->FileIndex;
961 } else if (level == SMB_FIND_FILE_INFO_STANDARD) {
962 FIND_FILE_STANDARD_INFO *pFindData =
963 (FIND_FILE_STANDARD_INFO *)current_entry;
964 filename = &pFindData->FileName[0];
965 /* one byte length, no name conversion */
966 len = (unsigned int)pFindData->FileNameLength;
967 cifsFile->srch_inf.resume_key = pFindData->ResumeKey;
968 } else {
969 cFYI(1, ("Unknown findfirst level %d", level));
970 return -EINVAL;
971 }
972 cifsFile->srch_inf.resume_name_len = len;
973 cifsFile->srch_inf.presume_name = filename;
974 return rc;
975 }
976
977 int cifs_readdir(struct file *file, void *direntry, filldir_t filldir)
978 {
979 int rc = 0;
980 int xid, i;
981 struct cifs_sb_info *cifs_sb;
982 struct cifsTconInfo *pTcon;
983 struct cifsFileInfo *cifsFile = NULL;
984 char *current_entry;
985 int num_to_fill = 0;
986 char *tmp_buf = NULL;
987 char *end_of_smb;
988 int max_len;
989
990 xid = GetXid();
991
992 cifs_sb = CIFS_SB(file->f_path.dentry->d_sb);
993 pTcon = cifs_sb->tcon;
994 if (pTcon == NULL)
995 return -EINVAL;
996
997 switch ((int) file->f_pos) {
998 case 0:
999 if (filldir(direntry, ".", 1, file->f_pos,
1000 file->f_path.dentry->d_inode->i_ino, DT_DIR) < 0) {
1001 cERROR(1, ("Filldir for current dir failed"));
1002 rc = -ENOMEM;
1003 break;
1004 }
1005 file->f_pos++;
1006 case 1:
1007 if (filldir(direntry, "..", 2, file->f_pos,
1008 file->f_path.dentry->d_parent->d_inode->i_ino, DT_DIR) < 0) {
1009 cERROR(1, ("Filldir for parent dir failed"));
1010 rc = -ENOMEM;
1011 break;
1012 }
1013 file->f_pos++;
1014 default:
1015 /* 1) If search is active,
1016 is in current search buffer?
1017 if it before then restart search
1018 if after then keep searching till find it */
1019
1020 if (file->private_data == NULL) {
1021 rc = initiate_cifs_search(xid, file);
1022 cFYI(1, ("initiate cifs search rc %d", rc));
1023 if (rc) {
1024 FreeXid(xid);
1025 return rc;
1026 }
1027 }
1028 if (file->private_data == NULL) {
1029 rc = -EINVAL;
1030 FreeXid(xid);
1031 return rc;
1032 }
1033 cifsFile = file->private_data;
1034 if (cifsFile->srch_inf.endOfSearch) {
1035 if (cifsFile->srch_inf.emptyDir) {
1036 cFYI(1, ("End of search, empty dir"));
1037 rc = 0;
1038 break;
1039 }
1040 } /* else {
1041 cifsFile->invalidHandle = TRUE;
1042 CIFSFindClose(xid, pTcon, cifsFile->netfid);
1043 }
1044 kfree(cifsFile->search_resume_name);
1045 cifsFile->search_resume_name = NULL; */
1046
1047 rc = find_cifs_entry(xid, pTcon, file,
1048 &current_entry, &num_to_fill);
1049 if (rc) {
1050 cFYI(1, ("fce error %d", rc));
1051 goto rddir2_exit;
1052 } else if (current_entry != NULL) {
1053 cFYI(1, ("entry %lld found", file->f_pos));
1054 } else {
1055 cFYI(1, ("could not find entry"));
1056 goto rddir2_exit;
1057 }
1058 cFYI(1, ("loop through %d times filling dir for net buf %p",
1059 num_to_fill, cifsFile->srch_inf.ntwrk_buf_start));
1060 max_len = smbCalcSize((struct smb_hdr *)
1061 cifsFile->srch_inf.ntwrk_buf_start);
1062 end_of_smb = cifsFile->srch_inf.ntwrk_buf_start + max_len;
1063
1064 /* To be safe - for UCS to UTF-8 with strings loaded
1065 with the rare long characters alloc more to account for
1066 such multibyte target UTF-8 characters. cifs_unicode.c,
1067 which actually does the conversion, has the same limit */
1068 tmp_buf = kmalloc((2 * NAME_MAX) + 4, GFP_KERNEL);
1069 for (i = 0; (i < num_to_fill) && (rc == 0); i++) {
1070 if (current_entry == NULL) {
1071 /* evaluate whether this case is an error */
1072 cERROR(1, ("past SMB end, num to fill %d i %d",
1073 num_to_fill, i));
1074 break;
1075 }
1076 /* if buggy server returns . and .. late do
1077 we want to check for that here? */
1078 rc = cifs_filldir(current_entry, file,
1079 filldir, direntry, tmp_buf, max_len);
1080 if (rc == -EOVERFLOW) {
1081 rc = 0;
1082 break;
1083 }
1084
1085 file->f_pos++;
1086 if (file->f_pos ==
1087 cifsFile->srch_inf.index_of_last_entry) {
1088 cFYI(1, ("last entry in buf at pos %lld %s",
1089 file->f_pos, tmp_buf));
1090 cifs_save_resume_key(current_entry, cifsFile);
1091 break;
1092 } else
1093 current_entry =
1094 nxt_dir_entry(current_entry, end_of_smb,
1095 cifsFile->srch_inf.info_level);
1096 }
1097 kfree(tmp_buf);
1098 break;
1099 } /* end switch */
1100
1101 rddir2_exit:
1102 FreeXid(xid);
1103 return rc;
1104 }
kernel-based virtual machine