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[CIFS] more whitespace cleanup
[linux-block.git] / fs / cifs / readdir.c
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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 "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
35static 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 }
48 if (cf->srch_inf.endOfSearch) {
49 cFYI(1, ("end of search"));
50 }
51 if (cf->srch_inf.emptyDir) {
52 cFYI(1, ("empty dir"));
53 }
54
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 */
61static 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
113static 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
124static 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
298static 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 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_OVERR_UID)
361 tmp_inode->i_uid = cifs_sb->mnt_uid;
362 else
363 tmp_inode->i_uid = le64_to_cpu(pfindData->Uid);
364 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_OVERR_GID)
365 tmp_inode->i_gid = cifs_sb->mnt_gid;
366 else
367 tmp_inode->i_gid = le64_to_cpu(pfindData->Gid);
368 tmp_inode->i_nlink = le64_to_cpu(pfindData->Nlinks);
369
370 spin_lock(&tmp_inode->i_lock);
371 if (is_size_safe_to_change(cifsInfo, end_of_file)) {
372 /* can not safely change the file size here if the
373 client is writing to it due to potential races */
374 i_size_write(tmp_inode, end_of_file);
375
376 /* 512 bytes (2**9) is the fake blocksize that must be used */
377 /* for this calculation, not the real blocksize */
378 tmp_inode->i_blocks = (512 - 1 + num_of_bytes) >> 9;
379 }
380 spin_unlock(&tmp_inode->i_lock);
381
382 if (S_ISREG(tmp_inode->i_mode)) {
383 cFYI(1, ("File inode"));
384 tmp_inode->i_op = &cifs_file_inode_ops;
385
386 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DIRECT_IO) {
387 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_BRL)
388 tmp_inode->i_fop = &cifs_file_direct_nobrl_ops;
389 else
390 tmp_inode->i_fop = &cifs_file_direct_ops;
391 } else if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_BRL)
392 tmp_inode->i_fop = &cifs_file_nobrl_ops;
393 else
394 tmp_inode->i_fop = &cifs_file_ops;
395
396 if ((cifs_sb->tcon) && (cifs_sb->tcon->ses) &&
397 (cifs_sb->tcon->ses->server->maxBuf <
398 PAGE_CACHE_SIZE + MAX_CIFS_HDR_SIZE))
399 tmp_inode->i_data.a_ops = &cifs_addr_ops_smallbuf;
400 else
401 tmp_inode->i_data.a_ops = &cifs_addr_ops;
402
403 if (isNewInode)
404 return; /* No sense invalidating pages for new inode
405 since we have not started caching readahead
406 file data for it yet */
407
408 if (timespec_equal(&tmp_inode->i_mtime, &local_mtime) &&
409 (local_size == tmp_inode->i_size)) {
410 cFYI(1, ("inode exists but unchanged"));
411 } else {
412 /* file may have changed on server */
413 cFYI(1, ("invalidate inode, readdir detected change"));
414 invalidate_remote_inode(tmp_inode);
415 }
416 } else if (S_ISDIR(tmp_inode->i_mode)) {
417 cFYI(1, ("Directory inode"));
418 tmp_inode->i_op = &cifs_dir_inode_ops;
419 tmp_inode->i_fop = &cifs_dir_ops;
420 } else if (S_ISLNK(tmp_inode->i_mode)) {
421 cFYI(1, ("Symbolic Link inode"));
422 tmp_inode->i_op = &cifs_symlink_inode_ops;
423/* tmp_inode->i_fop = *//* do not need to set to anything */
424 } else {
425 cFYI(1, ("Special inode"));
426 init_special_inode(tmp_inode, tmp_inode->i_mode,
427 tmp_inode->i_rdev);
428 }
429}
430
431static int initiate_cifs_search(const int xid, struct file *file)
432{
433 int rc = 0;
434 char * full_path;
435 struct cifsFileInfo * cifsFile;
436 struct cifs_sb_info *cifs_sb;
437 struct cifsTconInfo *pTcon;
438
439 if (file->private_data == NULL) {
440 file->private_data =
441 kzalloc(sizeof(struct cifsFileInfo),GFP_KERNEL);
442 }
443
444 if (file->private_data == NULL)
445 return -ENOMEM;
446 cifsFile = file->private_data;
447 cifsFile->invalidHandle = TRUE;
448 cifsFile->srch_inf.endOfSearch = FALSE;
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
466ffirst_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 */
495static 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
508static 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) */
543static 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",
588 cfile->srch_inf.info_level));
589 }
590
591 if (filename) {
592 if (cfile->srch_inf.unicode) {
593 __le16 *ufilename = (__le16 *)filename;
594 if (len == 2) {
595 /* check for . */
596 if (ufilename[0] == UNICODE_DOT)
597 rc = 1;
598 } else if (len == 4) {
599 /* check for .. */
600 if ((ufilename[0] == UNICODE_DOT)
601 &&(ufilename[1] == UNICODE_DOT))
602 rc = 2;
603 }
604 } else /* ASCII */ {
605 if (len == 1) {
606 if (filename[0] == '.')
607 rc = 1;
608 } else if (len == 2) {
609 if ((filename[0] == '.') && (filename[1] == '.'))
610 rc = 2;
611 }
612 }
613 }
614
615 return rc;
616}
617
618/* Check if directory that we are searching has changed so we can decide
619 whether we can use the cached search results from the previous search */
620static int is_dir_changed(struct file * file)
621{
622 struct inode *inode = file->f_path.dentry->d_inode;
623 struct cifsInodeInfo *cifsInfo = CIFS_I(inode);
624
625 if (cifsInfo->time == 0)
626 return 1; /* directory was changed, perhaps due to unlink */
627 else
628 return 0;
629
630}
631
632/* find the corresponding entry in the search */
633/* Note that the SMB server returns search entries for . and .. which
634 complicates logic here if we choose to parse for them and we do not
635 assume that they are located in the findfirst return buffer.*/
636/* We start counting in the buffer with entry 2 and increment for every
637 entry (do not increment for . or .. entry) */
638static int find_cifs_entry(const int xid, struct cifsTconInfo *pTcon,
639 struct file *file, char **ppCurrentEntry, int *num_to_ret)
640{
641 int rc = 0;
642 int pos_in_buf = 0;
643 loff_t first_entry_in_buffer;
644 loff_t index_to_find = file->f_pos;
645 struct cifsFileInfo * cifsFile = file->private_data;
646 /* check if index in the buffer */
647
648 if ((cifsFile == NULL) || (ppCurrentEntry == NULL) ||
649 (num_to_ret == NULL))
650 return -ENOENT;
651
652 *ppCurrentEntry = NULL;
653 first_entry_in_buffer =
654 cifsFile->srch_inf.index_of_last_entry -
655 cifsFile->srch_inf.entries_in_buffer;
656
657 /* if first entry in buf is zero then is first buffer
658 in search response data which means it is likely . and ..
659 will be in this buffer, although some servers do not return
660 . and .. for the root of a drive and for those we need
661 to start two entries earlier */
662
663#ifdef CONFIG_CIFS_DEBUG2
664 dump_cifs_file_struct(file, "In fce ");
665#endif
666 if (((index_to_find < cifsFile->srch_inf.index_of_last_entry) &&
667 is_dir_changed(file)) ||
668 (index_to_find < first_entry_in_buffer)) {
669 /* close and restart search */
670 cFYI(1, ("search backing up - close and restart search"));
671 cifsFile->invalidHandle = TRUE;
672 CIFSFindClose(xid, pTcon, cifsFile->netfid);
673 kfree(cifsFile->search_resume_name);
674 cifsFile->search_resume_name = NULL;
675 if (cifsFile->srch_inf.ntwrk_buf_start) {
676 cFYI(1, ("freeing SMB ff cache buf on search rewind"));
677 if (cifsFile->srch_inf.smallBuf)
678 cifs_small_buf_release(cifsFile->srch_inf.
679 ntwrk_buf_start);
680 else
681 cifs_buf_release(cifsFile->srch_inf.
682 ntwrk_buf_start);
683 }
684 rc = initiate_cifs_search(xid,file);
685 if (rc) {
686 cFYI(1, ("error %d reinitiating a search on rewind",
687 rc));
688 return rc;
689 }
690 }
691
692 while((index_to_find >= cifsFile->srch_inf.index_of_last_entry) &&
693 (rc == 0) && (cifsFile->srch_inf.endOfSearch == FALSE)){
694 cFYI(1, ("calling findnext2"));
695 rc = CIFSFindNext(xid,pTcon,cifsFile->netfid,
696 &cifsFile->srch_inf);
697 if (rc)
698 return -ENOENT;
699 }
700 if (index_to_find < cifsFile->srch_inf.index_of_last_entry) {
701 /* we found the buffer that contains the entry */
702 /* scan and find it */
703 int i;
704 char * current_entry;
705 char * end_of_smb = cifsFile->srch_inf.ntwrk_buf_start +
706 smbCalcSize((struct smb_hdr *)
707 cifsFile->srch_inf.ntwrk_buf_start);
708
709 current_entry = cifsFile->srch_inf.srch_entries_start;
710 first_entry_in_buffer = cifsFile->srch_inf.index_of_last_entry
711 - cifsFile->srch_inf.entries_in_buffer;
712 pos_in_buf = index_to_find - first_entry_in_buffer;
713 cFYI(1, ("found entry - pos_in_buf %d", pos_in_buf));
714
715 for(i=0;(i<(pos_in_buf)) && (current_entry != NULL);i++) {
716 /* go entry by entry figuring out which is first */
717 current_entry = nxt_dir_entry(current_entry,end_of_smb,
718 cifsFile->srch_inf.info_level);
719 }
720 if ((current_entry == NULL) && (i < pos_in_buf)) {
721 /* BB fixme - check if we should flag this error */
722 cERROR(1,("reached end of buf searching for pos in buf"
723 " %d index to find %lld rc %d",
724 pos_in_buf,index_to_find,rc));
725 }
726 rc = 0;
727 *ppCurrentEntry = current_entry;
728 } else {
729 cFYI(1, ("index not in buffer - could not findnext into it"));
730 return 0;
731 }
732
733 if (pos_in_buf >= cifsFile->srch_inf.entries_in_buffer) {
734 cFYI(1, ("can not return entries pos_in_buf beyond last"));
735 *num_to_ret = 0;
736 } else
737 *num_to_ret = cifsFile->srch_inf.entries_in_buffer - pos_in_buf;
738
739 return rc;
740}
741
742/* inode num, inode type and filename returned */
743static int cifs_get_name_from_search_buf(struct qstr *pqst,
744 char *current_entry, __u16 level, unsigned int unicode,
745 struct cifs_sb_info * cifs_sb, int max_len, ino_t *pinum)
746{
747 int rc = 0;
748 unsigned int len = 0;
749 char * filename;
750 struct nls_table * nlt = cifs_sb->local_nls;
751
752 *pinum = 0;
753
754 if (level == SMB_FIND_FILE_UNIX) {
755 FILE_UNIX_INFO * pFindData = (FILE_UNIX_INFO *)current_entry;
756
757 filename = &pFindData->FileName[0];
758 if (unicode) {
759 len = cifs_unicode_bytelen(filename);
760 } else {
761 /* BB should we make this strnlen of PATH_MAX? */
762 len = strnlen(filename, PATH_MAX);
763 }
764
765 /* BB fixme - hash low and high 32 bits if not 64 bit arch BB fixme */
766 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM)
767 *pinum = pFindData->UniqueId;
768 } else if (level == SMB_FIND_FILE_DIRECTORY_INFO) {
769 FILE_DIRECTORY_INFO * pFindData =
770 (FILE_DIRECTORY_INFO *)current_entry;
771 filename = &pFindData->FileName[0];
772 len = le32_to_cpu(pFindData->FileNameLength);
773 } else if (level == SMB_FIND_FILE_FULL_DIRECTORY_INFO) {
774 FILE_FULL_DIRECTORY_INFO * pFindData =
775 (FILE_FULL_DIRECTORY_INFO *)current_entry;
776 filename = &pFindData->FileName[0];
777 len = le32_to_cpu(pFindData->FileNameLength);
778 } else if (level == SMB_FIND_FILE_ID_FULL_DIR_INFO) {
779 SEARCH_ID_FULL_DIR_INFO * pFindData =
780 (SEARCH_ID_FULL_DIR_INFO *)current_entry;
781 filename = &pFindData->FileName[0];
782 len = le32_to_cpu(pFindData->FileNameLength);
783 *pinum = pFindData->UniqueId;
784 } else if (level == SMB_FIND_FILE_BOTH_DIRECTORY_INFO) {
785 FILE_BOTH_DIRECTORY_INFO * pFindData =
786 (FILE_BOTH_DIRECTORY_INFO *)current_entry;
787 filename = &pFindData->FileName[0];
788 len = le32_to_cpu(pFindData->FileNameLength);
789 } else if (level == SMB_FIND_FILE_INFO_STANDARD) {
790 FIND_FILE_STANDARD_INFO * pFindData =
791 (FIND_FILE_STANDARD_INFO *)current_entry;
792 filename = &pFindData->FileName[0];
793 /* one byte length, no name conversion */
794 len = (unsigned int)pFindData->FileNameLength;
795 } else {
796 cFYI(1, ("Unknown findfirst level %d", level));
797 return -EINVAL;
798 }
799
800 if (len > max_len) {
801 cERROR(1,("bad search response length %d past smb end", len));
802 return -EINVAL;
803 }
804
805 if (unicode) {
806 /* BB fixme - test with long names */
807 /* Note converted filename can be longer than in unicode */
808 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR)
809 pqst->len = cifs_convertUCSpath((char *)pqst->name,
810 (__le16 *)filename, len/2, nlt);
811 else
812 pqst->len = cifs_strfromUCS_le((char *)pqst->name,
813 (__le16 *)filename,len/2,nlt);
814 } else {
815 pqst->name = filename;
816 pqst->len = len;
817 }
818 pqst->hash = full_name_hash(pqst->name,pqst->len);
819/* cFYI(1, ("filldir on %s",pqst->name)); */
820 return rc;
821}
822
823static int cifs_filldir(char *pfindEntry, struct file *file,
824 filldir_t filldir, void *direntry, char *scratch_buf, int max_len)
825{
826 int rc = 0;
827 struct qstr qstring;
828 struct cifsFileInfo * pCifsF;
829 unsigned obj_type;
830 ino_t inum;
831 struct cifs_sb_info * cifs_sb;
832 struct inode *tmp_inode;
833 struct dentry *tmp_dentry;
834
835 /* get filename and len into qstring */
836 /* get dentry */
837 /* decide whether to create and populate ionde */
838 if ((direntry == NULL) || (file == NULL))
839 return -EINVAL;
840
841 pCifsF = file->private_data;
842
843 if ((scratch_buf == NULL) || (pfindEntry == NULL) || (pCifsF == NULL))
844 return -ENOENT;
845
846 rc = cifs_entry_is_dot(pfindEntry,pCifsF);
847 /* skip . and .. since we added them first */
848 if (rc != 0)
849 return 0;
850
851 cifs_sb = CIFS_SB(file->f_path.dentry->d_sb);
852
853 qstring.name = scratch_buf;
854 rc = cifs_get_name_from_search_buf(&qstring,pfindEntry,
855 pCifsF->srch_inf.info_level,
856 pCifsF->srch_inf.unicode,cifs_sb,
857 max_len,
858 &inum /* returned */);
859
860 if (rc)
861 return rc;
862
863 rc = construct_dentry(&qstring,file,&tmp_inode, &tmp_dentry);
864 if ((tmp_inode == NULL) || (tmp_dentry == NULL))
865 return -ENOMEM;
866
867 if (rc) {
868 /* inode created, we need to hash it with right inode number */
869 if (inum != 0) {
870 /* BB fixme - hash the 2 32 quantities bits together if necessary BB */
871 tmp_inode->i_ino = inum;
872 }
873 insert_inode_hash(tmp_inode);
874 }
875
876 /* we pass in rc below, indicating whether it is a new inode,
877 so we can figure out whether to invalidate the inode cached
878 data if the file has changed */
879 if (pCifsF->srch_inf.info_level == SMB_FIND_FILE_UNIX)
880 unix_fill_in_inode(tmp_inode,
881 (FILE_UNIX_INFO *)pfindEntry,
882 &obj_type, rc);
883 else if (pCifsF->srch_inf.info_level == SMB_FIND_FILE_INFO_STANDARD)
884 fill_in_inode(tmp_inode, 0 /* old level 1 buffer type */,
885 pfindEntry, &obj_type, rc);
886 else
887 fill_in_inode(tmp_inode, 1 /* NT */, pfindEntry, &obj_type, rc);
888
889 if (rc) /* new inode - needs to be tied to dentry */ {
890 d_instantiate(tmp_dentry, tmp_inode);
891 if (rc == 2)
892 d_rehash(tmp_dentry);
893 }
894
895
896 rc = filldir(direntry,qstring.name,qstring.len,file->f_pos,
897 tmp_inode->i_ino,obj_type);
898 if (rc) {
899 cFYI(1, ("filldir rc = %d", rc));
900 /* we can not return filldir errors to the caller
901 since they are "normal" when the stat blocksize
902 is too small - we return remapped error instead */
903 rc = -EOVERFLOW;
904 }
905
906 dput(tmp_dentry);
907 return rc;
908}
909
910static int cifs_save_resume_key(const char *current_entry,
911 struct cifsFileInfo *cifsFile)
912{
913 int rc = 0;
914 unsigned int len = 0;
915 __u16 level;
916 char * filename;
917
918 if ((cifsFile == NULL) || (current_entry == NULL))
919 return -EINVAL;
920
921 level = cifsFile->srch_inf.info_level;
922
923 if (level == SMB_FIND_FILE_UNIX) {
924 FILE_UNIX_INFO * pFindData = (FILE_UNIX_INFO *)current_entry;
925
926 filename = &pFindData->FileName[0];
927 if (cifsFile->srch_inf.unicode) {
928 len = cifs_unicode_bytelen(filename);
929 } else {
930 /* BB should we make this strnlen of PATH_MAX? */
931 len = strnlen(filename, PATH_MAX);
932 }
933 cifsFile->srch_inf.resume_key = pFindData->ResumeKey;
934 } else if (level == SMB_FIND_FILE_DIRECTORY_INFO) {
935 FILE_DIRECTORY_INFO * pFindData =
936 (FILE_DIRECTORY_INFO *)current_entry;
937 filename = &pFindData->FileName[0];
938 len = le32_to_cpu(pFindData->FileNameLength);
939 cifsFile->srch_inf.resume_key = pFindData->FileIndex;
940 } else if (level == SMB_FIND_FILE_FULL_DIRECTORY_INFO) {
941 FILE_FULL_DIRECTORY_INFO * pFindData =
942 (FILE_FULL_DIRECTORY_INFO *)current_entry;
943 filename = &pFindData->FileName[0];
944 len = le32_to_cpu(pFindData->FileNameLength);
945 cifsFile->srch_inf.resume_key = pFindData->FileIndex;
946 } else if (level == SMB_FIND_FILE_ID_FULL_DIR_INFO) {
947 SEARCH_ID_FULL_DIR_INFO * pFindData =
948 (SEARCH_ID_FULL_DIR_INFO *)current_entry;
949 filename = &pFindData->FileName[0];
950 len = le32_to_cpu(pFindData->FileNameLength);
951 cifsFile->srch_inf.resume_key = pFindData->FileIndex;
952 } else if (level == SMB_FIND_FILE_BOTH_DIRECTORY_INFO) {
953 FILE_BOTH_DIRECTORY_INFO * pFindData =
954 (FILE_BOTH_DIRECTORY_INFO *)current_entry;
955 filename = &pFindData->FileName[0];
956 len = le32_to_cpu(pFindData->FileNameLength);
957 cifsFile->srch_inf.resume_key = pFindData->FileIndex;
958 } else if (level == SMB_FIND_FILE_INFO_STANDARD) {
959 FIND_FILE_STANDARD_INFO * pFindData =
960 (FIND_FILE_STANDARD_INFO *)current_entry;
961 filename = &pFindData->FileName[0];
962 /* one byte length, no name conversion */
963 len = (unsigned int)pFindData->FileNameLength;
964 cifsFile->srch_inf.resume_key = pFindData->ResumeKey;
965 } else {
966 cFYI(1, ("Unknown findfirst level %d", level));
967 return -EINVAL;
968 }
969 cifsFile->srch_inf.resume_name_len = len;
970 cifsFile->srch_inf.presume_name = filename;
971 return rc;
972}
973
974int cifs_readdir(struct file *file, void *direntry, filldir_t filldir)
975{
976 int rc = 0;
977 int xid,i;
978 struct cifs_sb_info *cifs_sb;
979 struct cifsTconInfo *pTcon;
980 struct cifsFileInfo *cifsFile = NULL;
981 char * current_entry;
982 int num_to_fill = 0;
983 char * tmp_buf = NULL;
984 char * end_of_smb;
985 int max_len;
986
987 xid = GetXid();
988
989 cifs_sb = CIFS_SB(file->f_path.dentry->d_sb);
990 pTcon = cifs_sb->tcon;
991 if (pTcon == NULL)
992 return -EINVAL;
993
994 switch ((int) file->f_pos) {
995 case 0:
996 if (filldir(direntry, ".", 1, file->f_pos,
997 file->f_path.dentry->d_inode->i_ino, DT_DIR) < 0) {
998 cERROR(1, ("Filldir for current dir failed"));
999 rc = -ENOMEM;
1000 break;
1001 }
1002 file->f_pos++;
1003 case 1:
1004 if (filldir(direntry, "..", 2, file->f_pos,
1005 file->f_path.dentry->d_parent->d_inode->i_ino, DT_DIR) < 0) {
1006 cERROR(1, ("Filldir for parent dir failed"));
1007 rc = -ENOMEM;
1008 break;
1009 }
1010 file->f_pos++;
1011 default:
1012 /* 1) If search is active,
1013 is in current search buffer?
1014 if it before then restart search
1015 if after then keep searching till find it */
1016
1017 if (file->private_data == NULL) {
1018 rc = initiate_cifs_search(xid,file);
1019 cFYI(1, ("initiate cifs search rc %d", rc));
1020 if (rc) {
1021 FreeXid(xid);
1022 return rc;
1023 }
1024 }
1025 if (file->private_data == NULL) {
1026 rc = -EINVAL;
1027 FreeXid(xid);
1028 return rc;
1029 }
1030 cifsFile = file->private_data;
1031 if (cifsFile->srch_inf.endOfSearch) {
1032 if (cifsFile->srch_inf.emptyDir) {
1033 cFYI(1, ("End of search, empty dir"));
1034 rc = 0;
1035 break;
1036 }
1037 } /* else {
1038 cifsFile->invalidHandle = TRUE;
1039 CIFSFindClose(xid, pTcon, cifsFile->netfid);
1040 }
1041 kfree(cifsFile->search_resume_name);
1042 cifsFile->search_resume_name = NULL; */
1043
1044 rc = find_cifs_entry(xid,pTcon, file,
1045 &current_entry,&num_to_fill);
1046 if (rc) {
1047 cFYI(1, ("fce error %d", rc));
1048 goto rddir2_exit;
1049 } else if (current_entry != NULL) {
1050 cFYI(1, ("entry %lld found", file->f_pos));
1051 } else {
1052 cFYI(1, ("could not find entry"));
1053 goto rddir2_exit;
1054 }
1055 cFYI(1, ("loop through %d times filling dir for net buf %p",
1056 num_to_fill, cifsFile->srch_inf.ntwrk_buf_start));
1057 max_len = smbCalcSize((struct smb_hdr *)
1058 cifsFile->srch_inf.ntwrk_buf_start);
1059 end_of_smb = cifsFile->srch_inf.ntwrk_buf_start + max_len;
1060
1061 /* To be safe - for UCS to UTF-8 with strings loaded
1062 with the rare long characters alloc more to account for
1063 such multibyte target UTF-8 characters. cifs_unicode.c,
1064 which actually does the conversion, has the same limit */
1065 tmp_buf = kmalloc((2 * NAME_MAX) + 4, GFP_KERNEL);
1066 for (i = 0; (i < num_to_fill) && (rc == 0); i++) {
1067 if (current_entry == NULL) {
1068 /* evaluate whether this case is an error */
1069 cERROR(1,("past end of SMB num to fill %d i %d",
1070 num_to_fill, i));
1071 break;
1072 }
1073 /* if buggy server returns . and .. late do
1074 we want to check for that here? */
1075 rc = cifs_filldir(current_entry, file,
1076 filldir, direntry, tmp_buf, max_len);
1077 if (rc == -EOVERFLOW) {
1078 rc = 0;
1079 break;
1080 }
1081
1082 file->f_pos++;
1083 if (file->f_pos ==
1084 cifsFile->srch_inf.index_of_last_entry) {
1085 cFYI(1, ("last entry in buf at pos %lld %s",
1086 file->f_pos, tmp_buf));
1087 cifs_save_resume_key(current_entry, cifsFile);
1088 break;
1089 } else
1090 current_entry =
1091 nxt_dir_entry(current_entry, end_of_smb,
1092 cifsFile->srch_inf.info_level);
1093 }
1094 kfree(tmp_buf);
1095 break;
1096 } /* end switch */
1097
1098rddir2_exit:
1099 FreeXid(xid);
1100 return rc;
1101}
Linux 6.x block layer and io_uring tree(s)