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Merge branch 'work.misc' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs
[mirror_ubuntu-zesty-kernel.git] / fs / cifs / readdir.c
CommitLineData
1da177e4
LT
1/*
2 * fs/cifs/readdir.c
3 *
4 * Directory search handling
6dc0f87e 5 *
ad7a2926 6 * Copyright (C) International Business Machines Corp., 2004, 2008
cda0ec6a 7 * Copyright (C) Red Hat, Inc., 2011
1da177e4
LT
8 * Author(s): Steve French (sfrench@us.ibm.com)
9 *
10 * This library is free software; you can redistribute it and/or modify
11 * it under the terms of the GNU Lesser General Public License as published
12 * by the Free Software Foundation; either version 2.1 of the License, or
13 * (at your option) any later version.
14 *
15 * This library is distributed in the hope that it will be useful,
16 * but WITHOUT ANY WARRANTY; without even the implied warranty of
17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See
18 * the GNU Lesser General Public License for more details.
19 *
20 * You should have received a copy of the GNU Lesser General Public License
21 * along with this library; if not, write to the Free Software
22 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
23 */
24#include <linux/fs.h>
273d81d6 25#include <linux/pagemap.h>
5a0e3ad6 26#include <linux/slab.h>
1da177e4 27#include <linux/stat.h>
1da177e4
LT
28#include "cifspdu.h"
29#include "cifsglob.h"
30#include "cifsproto.h"
31#include "cifs_unicode.h"
32#include "cifs_debug.h"
33#include "cifs_fs_sb.h"
34#include "cifsfs.h"
35
f5884166
JL
36/*
37 * To be safe - for UCS to UTF-8 with strings loaded with the rare long
38 * characters alloc more to account for such multibyte target UTF-8
39 * characters.
40 */
41#define UNICODE_NAME_MAX ((4 * NAME_MAX) + 2)
42
3979877e
SF
43#ifdef CONFIG_CIFS_DEBUG2
44static void dump_cifs_file_struct(struct file *file, char *label)
1da177e4 45{
6dc0f87e 46 struct cifsFileInfo *cf;
1da177e4 47
4523cc30 48 if (file) {
1da177e4 49 cf = file->private_data;
4523cc30 50 if (cf == NULL) {
f96637be 51 cifs_dbg(FYI, "empty cifs private file data\n");
1da177e4
LT
52 return;
53 }
ad7a2926 54 if (cf->invalidHandle)
f96637be 55 cifs_dbg(FYI, "invalid handle\n");
ad7a2926 56 if (cf->srch_inf.endOfSearch)
f96637be 57 cifs_dbg(FYI, "end of search\n");
ad7a2926 58 if (cf->srch_inf.emptyDir)
f96637be 59 cifs_dbg(FYI, "empty dir\n");
1da177e4 60 }
3979877e 61}
90c81e0b
SF
62#else
63static inline void dump_cifs_file_struct(struct file *file, char *label)
64{
65}
3979877e 66#endif /* DEBUG2 */
1da177e4 67
cc0bad75 68/*
eb1b3fa5
JL
69 * Attempt to preload the dcache with the results from the FIND_FIRST/NEXT
70 *
cc0bad75 71 * Find the dentry that matches "name". If there isn't one, create one. If it's
9e6d722f
NA
72 * a negative dentry or the uniqueid or filetype(mode) changed,
73 * then drop it and recreate it.
cc0bad75 74 */
eb1b3fa5
JL
75static void
76cifs_prime_dcache(struct dentry *parent, struct qstr *name,
cc0bad75
JL
77 struct cifs_fattr *fattr)
78{
79 struct dentry *dentry, *alias;
80 struct inode *inode;
fc64005c 81 struct super_block *sb = parent->d_sb;
2f2591a3 82 struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
3125d265 83 DECLARE_WAIT_QUEUE_HEAD_ONSTACK(wq);
cc0bad75 84
f96637be 85 cifs_dbg(FYI, "%s: for %s\n", __func__, name->name);
cc0bad75 86
4f522a24 87 dentry = d_hash_and_lookup(parent, name);
3125d265
AV
88 if (!dentry) {
89 /*
90 * If we know that the inode will need to be revalidated
91 * immediately, then don't create a new dentry for it.
92 * We'll end up doing an on the wire call either way and
93 * this spares us an invalidation.
94 */
95 if (fattr->cf_flags & CIFS_FATTR_NEED_REVAL)
96 return;
97retry:
98 dentry = d_alloc_parallel(parent, name, &wq);
99 }
a1c83681 100 if (IS_ERR(dentry))
4f522a24 101 return;
3125d265 102 if (!d_in_lookup(dentry)) {
2b0143b5 103 inode = d_inode(dentry);
2f2591a3 104 if (inode) {
3125d265
AV
105 if (d_mountpoint(dentry)) {
106 dput(dentry);
107 return;
108 }
2f2591a3
JL
109 /*
110 * If we're generating inode numbers, then we don't
111 * want to clobber the existing one with the one that
112 * the readdir code created.
113 */
114 if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM))
115 fattr->cf_uniqueid = CIFS_I(inode)->uniqueid;
116
9e6d722f
NA
117 /* update inode in place
118 * if both i_ino and i_mode didn't change */
119 if (CIFS_I(inode)->uniqueid == fattr->cf_uniqueid &&
120 (inode->i_mode & S_IFMT) ==
121 (fattr->cf_mode & S_IFMT)) {
2f2591a3 122 cifs_fattr_to_inode(inode, fattr);
3125d265
AV
123 dput(dentry);
124 return;
2f2591a3 125 }
cd60042c 126 }
5542aa2f 127 d_invalidate(dentry);
cc0bad75 128 dput(dentry);
3125d265
AV
129 goto retry;
130 } else {
131 inode = cifs_iget(sb, fattr);
132 if (!inode)
133 inode = ERR_PTR(-ENOMEM);
134 alias = d_splice_alias(inode, dentry);
135 d_lookup_done(dentry);
136 if (alias && !IS_ERR(alias))
137 dput(alias);
cc0bad75 138 }
eb1b3fa5 139 dput(dentry);
cc0bad75
JL
140}
141
0b8f18e3
JL
142static void
143cifs_fill_common_info(struct cifs_fattr *fattr, struct cifs_sb_info *cifs_sb)
1da177e4 144{
0b8f18e3
JL
145 fattr->cf_uid = cifs_sb->mnt_uid;
146 fattr->cf_gid = cifs_sb->mnt_gid;
1da177e4 147
0b8f18e3
JL
148 if (fattr->cf_cifsattrs & ATTR_DIRECTORY) {
149 fattr->cf_mode = S_IFDIR | cifs_sb->mnt_dir_mode;
150 fattr->cf_dtype = DT_DIR;
1da177e4 151 } else {
0b8f18e3
JL
152 fattr->cf_mode = S_IFREG | cifs_sb->mnt_file_mode;
153 fattr->cf_dtype = DT_REG;
1da177e4
LT
154 }
155
eb85d94b
PS
156 /*
157 * We need to revalidate it further to make a decision about whether it
158 * is a symbolic link, DFS referral or a reparse point with a direct
159 * access like junctions, deduplicated files, NFS symlinks.
160 */
161 if (fattr->cf_cifsattrs & ATTR_REPARSE)
162 fattr->cf_flags |= CIFS_FATTR_NEED_REVAL;
163
74d290da
JM
164 /* non-unix readdir doesn't provide nlink */
165 fattr->cf_flags |= CIFS_FATTR_UNKNOWN_NLINK;
166
0b8f18e3
JL
167 if (fattr->cf_cifsattrs & ATTR_READONLY)
168 fattr->cf_mode &= ~S_IWUGO;
5bafd765 169
ccb5c001
JL
170 /*
171 * We of course don't get ACL info in FIND_FIRST/NEXT results, so
172 * mark it for revalidation so that "ls -l" will look right. It might
173 * be super-slow, but if we don't do this then the ownership of files
174 * may look wrong since the inodes may not have timed out by the time
175 * "ls" does a stat() call on them.
176 */
177 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_CIFS_ACL)
178 fattr->cf_flags |= CIFS_FATTR_NEED_REVAL;
179
0b8f18e3
JL
180 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_UNX_EMUL &&
181 fattr->cf_cifsattrs & ATTR_SYSTEM) {
182 if (fattr->cf_eof == 0) {
183 fattr->cf_mode &= ~S_IFMT;
184 fattr->cf_mode |= S_IFIFO;
185 fattr->cf_dtype = DT_FIFO;
3020a1f5 186 } else {
4468eb3f 187 /*
0b8f18e3
JL
188 * trying to get the type and mode via SFU can be slow,
189 * so just call those regular files for now, and mark
190 * for reval
4468eb3f 191 */
0b8f18e3 192 fattr->cf_flags |= CIFS_FATTR_NEED_REVAL;
4468eb3f
JL
193 }
194 }
0b8f18e3 195}
1da177e4 196
c052e2b4 197void
0b8f18e3
JL
198cifs_dir_info_to_fattr(struct cifs_fattr *fattr, FILE_DIRECTORY_INFO *info,
199 struct cifs_sb_info *cifs_sb)
200{
201 memset(fattr, 0, sizeof(*fattr));
202 fattr->cf_cifsattrs = le32_to_cpu(info->ExtFileAttributes);
203 fattr->cf_eof = le64_to_cpu(info->EndOfFile);
204 fattr->cf_bytes = le64_to_cpu(info->AllocationSize);
20054bd6 205 fattr->cf_createtime = le64_to_cpu(info->CreationTime);
0b8f18e3
JL
206 fattr->cf_atime = cifs_NTtimeToUnix(info->LastAccessTime);
207 fattr->cf_ctime = cifs_NTtimeToUnix(info->ChangeTime);
208 fattr->cf_mtime = cifs_NTtimeToUnix(info->LastWriteTime);
209
210 cifs_fill_common_info(fattr, cifs_sb);
211}
1da177e4 212
15dd4781 213static void
0b8f18e3
JL
214cifs_std_info_to_fattr(struct cifs_fattr *fattr, FIND_FILE_STANDARD_INFO *info,
215 struct cifs_sb_info *cifs_sb)
216{
0d424ad0 217 int offset = cifs_sb_master_tcon(cifs_sb)->ses->server->timeAdj;
1da177e4 218
0b8f18e3
JL
219 memset(fattr, 0, sizeof(*fattr));
220 fattr->cf_atime = cnvrtDosUnixTm(info->LastAccessDate,
221 info->LastAccessTime, offset);
222 fattr->cf_ctime = cnvrtDosUnixTm(info->LastWriteDate,
223 info->LastWriteTime, offset);
224 fattr->cf_mtime = cnvrtDosUnixTm(info->LastWriteDate,
225 info->LastWriteTime, offset);
226
227 fattr->cf_cifsattrs = le16_to_cpu(info->Attributes);
228 fattr->cf_bytes = le32_to_cpu(info->AllocationSize);
229 fattr->cf_eof = le32_to_cpu(info->DataSize);
230
231 cifs_fill_common_info(fattr, cifs_sb);
1da177e4
LT
232}
233
0e0d2cf3
SF
234/* BB eventually need to add the following helper function to
235 resolve NT_STATUS_STOPPED_ON_SYMLINK return code when
236 we try to do FindFirst on (NTFS) directory symlinks */
237/*
238int get_symlink_reparse_path(char *full_path, struct cifs_sb_info *cifs_sb,
6d5786a3 239 unsigned int xid)
0e0d2cf3
SF
240{
241 __u16 fid;
242 int len;
243 int oplock = 0;
244 int rc;
96daf2b0 245 struct cifs_tcon *ptcon = cifs_sb_tcon(cifs_sb);
0e0d2cf3
SF
246 char *tmpbuffer;
247
248 rc = CIFSSMBOpen(xid, ptcon, full_path, FILE_OPEN, GENERIC_READ,
249 OPEN_REPARSE_POINT, &fid, &oplock, NULL,
250 cifs_sb->local_nls,
2baa2682 251 cifs_remap(cifs_sb);
0e0d2cf3
SF
252 if (!rc) {
253 tmpbuffer = kmalloc(maxpath);
254 rc = CIFSSMBQueryReparseLinkInfo(xid, ptcon, full_path,
255 tmpbuffer,
256 maxpath -1,
257 fid,
258 cifs_sb->local_nls);
259 if (CIFSSMBClose(xid, ptcon, fid)) {
f96637be 260 cifs_dbg(FYI, "Error closing temporary reparsepoint open\n");
0e0d2cf3
SF
261 }
262 }
263}
264 */
265
92fc65a7
PS
266static int
267initiate_cifs_search(const unsigned int xid, struct file *file)
1da177e4 268{
2608bee7 269 __u16 search_flags;
1da177e4 270 int rc = 0;
7ffec372 271 char *full_path = NULL;
3870253e 272 struct cifsFileInfo *cifsFile;
7119e220 273 struct cifs_sb_info *cifs_sb = CIFS_FILE_SB(file);
59c55ba1 274 struct tcon_link *tlink = NULL;
29e20f9c 275 struct cifs_tcon *tcon;
92fc65a7 276 struct TCP_Server_Info *server;
1da177e4 277
7ffec372 278 if (file->private_data == NULL) {
59c55ba1
JL
279 tlink = cifs_sb_tlink(cifs_sb);
280 if (IS_ERR(tlink))
281 return PTR_ERR(tlink);
282
283 cifsFile = kzalloc(sizeof(struct cifsFileInfo), GFP_KERNEL);
284 if (cifsFile == NULL) {
285 rc = -ENOMEM;
286 goto error_exit;
287 }
288 file->private_data = cifsFile;
289 cifsFile->tlink = cifs_get_tlink(tlink);
29e20f9c 290 tcon = tlink_tcon(tlink);
59c55ba1
JL
291 } else {
292 cifsFile = file->private_data;
29e20f9c 293 tcon = tlink_tcon(cifsFile->tlink);
7ffec372 294 }
1da177e4 295
92fc65a7
PS
296 server = tcon->ses->server;
297
298 if (!server->ops->query_dir_first) {
299 rc = -ENOSYS;
300 goto error_exit;
301 }
302
4b18f2a9
SF
303 cifsFile->invalidHandle = true;
304 cifsFile->srch_inf.endOfSearch = false;
1da177e4 305
1f1735cb 306 full_path = build_path_from_dentry(file_dentry(file));
7ffec372
JL
307 if (full_path == NULL) {
308 rc = -ENOMEM;
309 goto error_exit;
310 }
1da177e4 311
f96637be 312 cifs_dbg(FYI, "Full path: %s start at: %lld\n", full_path, file->f_pos);
1da177e4 313
75cf6bdc 314ffirst_retry:
1da177e4 315 /* test for Unix extensions */
c18c842b 316 /* but now check for them on the share/mount not on the SMB session */
29e20f9c
PS
317 /* if (cap_unix(tcon->ses) { */
318 if (tcon->unix_ext)
5bafd765 319 cifsFile->srch_inf.info_level = SMB_FIND_FILE_UNIX;
29e20f9c
PS
320 else if ((tcon->ses->capabilities &
321 tcon->ses->server->vals->cap_nt_find) == 0) {
5bafd765 322 cifsFile->srch_inf.info_level = SMB_FIND_FILE_INFO_STANDARD;
1da177e4
LT
323 } else if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM) {
324 cifsFile->srch_inf.info_level = SMB_FIND_FILE_ID_FULL_DIR_INFO;
325 } else /* not srvinos - BB fixme add check for backlevel? */ {
326 cifsFile->srch_inf.info_level = SMB_FIND_FILE_DIRECTORY_INFO;
327 }
328
2608bee7
SP
329 search_flags = CIFS_SEARCH_CLOSE_AT_END | CIFS_SEARCH_RETURN_RESUME;
330 if (backup_cred(cifs_sb))
331 search_flags |= CIFS_SEARCH_BACKUP_SEARCH;
332
92fc65a7
PS
333 rc = server->ops->query_dir_first(xid, tcon, full_path, cifs_sb,
334 &cifsFile->fid, search_flags,
335 &cifsFile->srch_inf);
336
4523cc30 337 if (rc == 0)
4b18f2a9 338 cifsFile->invalidHandle = false;
e836f015 339 /* BB add following call to handle readdir on new NTFS symlink errors
0e0d2cf3
SF
340 else if STATUS_STOPPED_ON_SYMLINK
341 call get_symlink_reparse_path and retry with new path */
342 else if ((rc == -EOPNOTSUPP) &&
75cf6bdc
SF
343 (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM)) {
344 cifs_sb->mnt_cifs_flags &= ~CIFS_MOUNT_SERVER_INUM;
345 goto ffirst_retry;
346 }
7ffec372 347error_exit:
1da177e4 348 kfree(full_path);
7ffec372 349 cifs_put_tlink(tlink);
1da177e4
LT
350 return rc;
351}
352
353/* return length of unicode string in bytes */
cda0ec6a 354static int cifs_unicode_bytelen(const char *str)
1da177e4
LT
355{
356 int len;
cda0ec6a 357 const __le16 *ustr = (const __le16 *)str;
1da177e4 358
3870253e 359 for (len = 0; len <= PATH_MAX; len++) {
4523cc30 360 if (ustr[len] == 0)
1da177e4
LT
361 return len << 1;
362 }
f96637be 363 cifs_dbg(FYI, "Unicode string longer than PATH_MAX found\n");
1da177e4
LT
364 return len << 1;
365}
366
5bafd765 367static char *nxt_dir_entry(char *old_entry, char *end_of_smb, int level)
1da177e4 368{
3870253e 369 char *new_entry;
ad7a2926 370 FILE_DIRECTORY_INFO *pDirInfo = (FILE_DIRECTORY_INFO *)old_entry;
1da177e4 371
4523cc30 372 if (level == SMB_FIND_FILE_INFO_STANDARD) {
ad7a2926 373 FIND_FILE_STANDARD_INFO *pfData;
5bafd765
SF
374 pfData = (FIND_FILE_STANDARD_INFO *)pDirInfo;
375
376 new_entry = old_entry + sizeof(FIND_FILE_STANDARD_INFO) +
377 pfData->FileNameLength;
378 } else
379 new_entry = old_entry + le32_to_cpu(pDirInfo->NextEntryOffset);
f96637be 380 cifs_dbg(FYI, "new entry %p old entry %p\n", new_entry, old_entry);
1da177e4 381 /* validate that new_entry is not past end of SMB */
4523cc30 382 if (new_entry >= end_of_smb) {
f96637be
JP
383 cifs_dbg(VFS, "search entry %p began after end of SMB %p old entry %p\n",
384 new_entry, end_of_smb, old_entry);
1da177e4 385 return NULL;
4523cc30 386 } else if (((level == SMB_FIND_FILE_INFO_STANDARD) &&
3870253e
SF
387 (new_entry + sizeof(FIND_FILE_STANDARD_INFO) > end_of_smb))
388 || ((level != SMB_FIND_FILE_INFO_STANDARD) &&
5bafd765 389 (new_entry + sizeof(FILE_DIRECTORY_INFO) > end_of_smb))) {
f96637be
JP
390 cifs_dbg(VFS, "search entry %p extends after end of SMB %p\n",
391 new_entry, end_of_smb);
09d1db5c 392 return NULL;
3870253e 393 } else
1da177e4
LT
394 return new_entry;
395
396}
397
cda0ec6a
CH
398struct cifs_dirent {
399 const char *name;
400 size_t namelen;
401 u32 resume_key;
402 u64 ino;
403};
404
405static void cifs_fill_dirent_unix(struct cifs_dirent *de,
406 const FILE_UNIX_INFO *info, bool is_unicode)
407{
408 de->name = &info->FileName[0];
409 if (is_unicode)
410 de->namelen = cifs_unicode_bytelen(de->name);
411 else
412 de->namelen = strnlen(de->name, PATH_MAX);
413 de->resume_key = info->ResumeKey;
414 de->ino = le64_to_cpu(info->basic.UniqueId);
415}
416
417static void cifs_fill_dirent_dir(struct cifs_dirent *de,
418 const FILE_DIRECTORY_INFO *info)
419{
420 de->name = &info->FileName[0];
421 de->namelen = le32_to_cpu(info->FileNameLength);
422 de->resume_key = info->FileIndex;
423}
424
425static void cifs_fill_dirent_full(struct cifs_dirent *de,
426 const FILE_FULL_DIRECTORY_INFO *info)
427{
428 de->name = &info->FileName[0];
429 de->namelen = le32_to_cpu(info->FileNameLength);
430 de->resume_key = info->FileIndex;
431}
432
433static void cifs_fill_dirent_search(struct cifs_dirent *de,
434 const SEARCH_ID_FULL_DIR_INFO *info)
435{
436 de->name = &info->FileName[0];
437 de->namelen = le32_to_cpu(info->FileNameLength);
438 de->resume_key = info->FileIndex;
439 de->ino = le64_to_cpu(info->UniqueId);
440}
441
442static void cifs_fill_dirent_both(struct cifs_dirent *de,
443 const FILE_BOTH_DIRECTORY_INFO *info)
444{
445 de->name = &info->FileName[0];
446 de->namelen = le32_to_cpu(info->FileNameLength);
447 de->resume_key = info->FileIndex;
448}
449
450static void cifs_fill_dirent_std(struct cifs_dirent *de,
451 const FIND_FILE_STANDARD_INFO *info)
452{
453 de->name = &info->FileName[0];
454 /* one byte length, no endianess conversion */
455 de->namelen = info->FileNameLength;
456 de->resume_key = info->ResumeKey;
457}
458
459static int cifs_fill_dirent(struct cifs_dirent *de, const void *info,
460 u16 level, bool is_unicode)
461{
462 memset(de, 0, sizeof(*de));
463
464 switch (level) {
465 case SMB_FIND_FILE_UNIX:
466 cifs_fill_dirent_unix(de, info, is_unicode);
467 break;
468 case SMB_FIND_FILE_DIRECTORY_INFO:
469 cifs_fill_dirent_dir(de, info);
470 break;
471 case SMB_FIND_FILE_FULL_DIRECTORY_INFO:
472 cifs_fill_dirent_full(de, info);
473 break;
474 case SMB_FIND_FILE_ID_FULL_DIR_INFO:
475 cifs_fill_dirent_search(de, info);
476 break;
477 case SMB_FIND_FILE_BOTH_DIRECTORY_INFO:
478 cifs_fill_dirent_both(de, info);
479 break;
480 case SMB_FIND_FILE_INFO_STANDARD:
481 cifs_fill_dirent_std(de, info);
482 break;
483 default:
f96637be 484 cifs_dbg(FYI, "Unknown findfirst level %d\n", level);
cda0ec6a
CH
485 return -EINVAL;
486 }
487
488 return 0;
489}
490
1da177e4
LT
491#define UNICODE_DOT cpu_to_le16(0x2e)
492
493/* return 0 if no match and 1 for . (current directory) and 2 for .. (parent) */
cda0ec6a 494static int cifs_entry_is_dot(struct cifs_dirent *de, bool is_unicode)
1da177e4
LT
495{
496 int rc = 0;
1da177e4 497
cda0ec6a
CH
498 if (!de->name)
499 return 0;
1da177e4 500
cda0ec6a
CH
501 if (is_unicode) {
502 __le16 *ufilename = (__le16 *)de->name;
503 if (de->namelen == 2) {
504 /* check for . */
505 if (ufilename[0] == UNICODE_DOT)
506 rc = 1;
507 } else if (de->namelen == 4) {
508 /* check for .. */
509 if (ufilename[0] == UNICODE_DOT &&
510 ufilename[1] == UNICODE_DOT)
511 rc = 2;
512 }
513 } else /* ASCII */ {
514 if (de->namelen == 1) {
515 if (de->name[0] == '.')
516 rc = 1;
517 } else if (de->namelen == 2) {
518 if (de->name[0] == '.' && de->name[1] == '.')
519 rc = 2;
1da177e4
LT
520 }
521 }
522
523 return rc;
524}
525
eafe8701
SF
526/* Check if directory that we are searching has changed so we can decide
527 whether we can use the cached search results from the previous search */
3870253e 528static int is_dir_changed(struct file *file)
eafe8701 529{
496ad9aa 530 struct inode *inode = file_inode(file);
c33f8d32 531 struct cifsInodeInfo *cifsInfo = CIFS_I(inode);
eafe8701 532
c33f8d32 533 if (cifsInfo->time == 0)
eafe8701
SF
534 return 1; /* directory was changed, perhaps due to unlink */
535 else
536 return 0;
537
538}
539
0752f152 540static int cifs_save_resume_key(const char *current_entry,
eaf35b1e 541 struct cifsFileInfo *file_info)
0752f152 542{
eaf35b1e
CH
543 struct cifs_dirent de;
544 int rc;
0752f152 545
eaf35b1e
CH
546 rc = cifs_fill_dirent(&de, current_entry, file_info->srch_inf.info_level,
547 file_info->srch_inf.unicode);
548 if (!rc) {
549 file_info->srch_inf.presume_name = de.name;
550 file_info->srch_inf.resume_name_len = de.namelen;
551 file_info->srch_inf.resume_key = de.resume_key;
0752f152 552 }
0752f152
SF
553 return rc;
554}
555
92fc65a7
PS
556/*
557 * Find the corresponding entry in the search. Note that the SMB server returns
558 * search entries for . and .. which complicates logic here if we choose to
559 * parse for them and we do not assume that they are located in the findfirst
560 * return buffer. We start counting in the buffer with entry 2 and increment for
561 * every entry (do not increment for . or .. entry).
562 */
563static int
be4ccdcc 564find_cifs_entry(const unsigned int xid, struct cifs_tcon *tcon, loff_t pos,
92fc65a7 565 struct file *file, char **current_entry, int *num_to_ret)
1da177e4 566{
2608bee7 567 __u16 search_flags;
1da177e4
LT
568 int rc = 0;
569 int pos_in_buf = 0;
570 loff_t first_entry_in_buffer;
be4ccdcc 571 loff_t index_to_find = pos;
92fc65a7 572 struct cifsFileInfo *cfile = file->private_data;
7119e220 573 struct cifs_sb_info *cifs_sb = CIFS_FILE_SB(file);
92fc65a7 574 struct TCP_Server_Info *server = tcon->ses->server;
1da177e4 575 /* check if index in the buffer */
50c2f753 576
92fc65a7
PS
577 if (!server->ops->query_dir_first || !server->ops->query_dir_next)
578 return -ENOSYS;
579
580 if ((cfile == NULL) || (current_entry == NULL) || (num_to_ret == NULL))
1da177e4 581 return -ENOENT;
50c2f753 582
92fc65a7
PS
583 *current_entry = NULL;
584 first_entry_in_buffer = cfile->srch_inf.index_of_last_entry -
585 cfile->srch_inf.entries_in_buffer;
60808233 586
92fc65a7
PS
587 /*
588 * If first entry in buf is zero then is first buffer
589 * in search response data which means it is likely . and ..
590 * will be in this buffer, although some servers do not return
591 * . and .. for the root of a drive and for those we need
592 * to start two entries earlier.
593 */
60808233 594
3979877e 595 dump_cifs_file_struct(file, "In fce ");
92fc65a7
PS
596 if (((index_to_find < cfile->srch_inf.index_of_last_entry) &&
597 is_dir_changed(file)) || (index_to_find < first_entry_in_buffer)) {
1da177e4 598 /* close and restart search */
f96637be 599 cifs_dbg(FYI, "search backing up - close and restart search\n");
4477288a 600 spin_lock(&cifs_file_list_lock);
52755808 601 if (server->ops->dir_needs_close(cfile)) {
92fc65a7 602 cfile->invalidHandle = true;
4477288a 603 spin_unlock(&cifs_file_list_lock);
f736906a
PS
604 if (server->ops->close_dir)
605 server->ops->close_dir(xid, tcon, &cfile->fid);
ddb4cbfc 606 } else
4477288a 607 spin_unlock(&cifs_file_list_lock);
92fc65a7 608 if (cfile->srch_inf.ntwrk_buf_start) {
f96637be 609 cifs_dbg(FYI, "freeing SMB ff cache buf on search rewind\n");
92fc65a7
PS
610 if (cfile->srch_inf.smallBuf)
611 cifs_small_buf_release(cfile->srch_inf.
d47d7c1a
SF
612 ntwrk_buf_start);
613 else
92fc65a7 614 cifs_buf_release(cfile->srch_inf.
d47d7c1a 615 ntwrk_buf_start);
92fc65a7 616 cfile->srch_inf.ntwrk_buf_start = NULL;
1da177e4 617 }
3870253e 618 rc = initiate_cifs_search(xid, file);
4523cc30 619 if (rc) {
f96637be 620 cifs_dbg(FYI, "error %d reinitiating a search on rewind\n",
b6b38f70 621 rc);
1da177e4
LT
622 return rc;
623 }
7023676f 624 /* FindFirst/Next set last_entry to NULL on malformed reply */
92fc65a7
PS
625 if (cfile->srch_inf.last_entry)
626 cifs_save_resume_key(cfile->srch_inf.last_entry, cfile);
1da177e4
LT
627 }
628
2608bee7
SP
629 search_flags = CIFS_SEARCH_CLOSE_AT_END | CIFS_SEARCH_RETURN_RESUME;
630 if (backup_cred(cifs_sb))
631 search_flags |= CIFS_SEARCH_BACKUP_SEARCH;
632
92fc65a7
PS
633 while ((index_to_find >= cfile->srch_inf.index_of_last_entry) &&
634 (rc == 0) && !cfile->srch_inf.endOfSearch) {
f96637be 635 cifs_dbg(FYI, "calling findnext2\n");
92fc65a7
PS
636 rc = server->ops->query_dir_next(xid, tcon, &cfile->fid,
637 search_flags,
638 &cfile->srch_inf);
7023676f 639 /* FindFirst/Next set last_entry to NULL on malformed reply */
92fc65a7
PS
640 if (cfile->srch_inf.last_entry)
641 cifs_save_resume_key(cfile->srch_inf.last_entry, cfile);
4523cc30 642 if (rc)
1da177e4
LT
643 return -ENOENT;
644 }
92fc65a7 645 if (index_to_find < cfile->srch_inf.index_of_last_entry) {
1da177e4
LT
646 /* we found the buffer that contains the entry */
647 /* scan and find it */
648 int i;
92fc65a7
PS
649 char *cur_ent;
650 char *end_of_smb = cfile->srch_inf.ntwrk_buf_start +
651 server->ops->calc_smb_size(
652 cfile->srch_inf.ntwrk_buf_start);
653
654 cur_ent = cfile->srch_inf.srch_entries_start;
655 first_entry_in_buffer = cfile->srch_inf.index_of_last_entry
656 - cfile->srch_inf.entries_in_buffer;
1da177e4 657 pos_in_buf = index_to_find - first_entry_in_buffer;
f96637be 658 cifs_dbg(FYI, "found entry - pos_in_buf %d\n", pos_in_buf);
5bafd765 659
92fc65a7 660 for (i = 0; (i < (pos_in_buf)) && (cur_ent != NULL); i++) {
dfb7533b 661 /* go entry by entry figuring out which is first */
92fc65a7
PS
662 cur_ent = nxt_dir_entry(cur_ent, end_of_smb,
663 cfile->srch_inf.info_level);
1da177e4 664 }
92fc65a7 665 if ((cur_ent == NULL) && (i < pos_in_buf)) {
1da177e4 666 /* BB fixme - check if we should flag this error */
f96637be
JP
667 cifs_dbg(VFS, "reached end of buf searching for pos in buf %d index to find %lld rc %d\n",
668 pos_in_buf, index_to_find, rc);
1da177e4
LT
669 }
670 rc = 0;
92fc65a7 671 *current_entry = cur_ent;
1da177e4 672 } else {
f96637be 673 cifs_dbg(FYI, "index not in buffer - could not findnext into it\n");
1da177e4
LT
674 return 0;
675 }
676
92fc65a7 677 if (pos_in_buf >= cfile->srch_inf.entries_in_buffer) {
f96637be 678 cifs_dbg(FYI, "can not return entries pos_in_buf beyond last\n");
1da177e4
LT
679 *num_to_ret = 0;
680 } else
92fc65a7 681 *num_to_ret = cfile->srch_inf.entries_in_buffer - pos_in_buf;
1da177e4
LT
682
683 return rc;
684}
685
be4ccdcc
AV
686static int cifs_filldir(char *find_entry, struct file *file,
687 struct dir_context *ctx,
688 char *scratch_buf, unsigned int max_len)
1da177e4 689{
9feed6f8 690 struct cifsFileInfo *file_info = file->private_data;
7119e220 691 struct super_block *sb = file_inode(file)->i_sb;
9feed6f8 692 struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
cda0ec6a 693 struct cifs_dirent de = { NULL, };
cc0bad75 694 struct cifs_fattr fattr;
9feed6f8 695 struct qstr name;
1da177e4 696 int rc = 0;
9feed6f8 697 ino_t ino;
1da177e4 698
cda0ec6a
CH
699 rc = cifs_fill_dirent(&de, find_entry, file_info->srch_inf.info_level,
700 file_info->srch_inf.unicode);
701 if (rc)
702 return rc;
5bafd765 703
f16d59b4 704 if (de.namelen > max_len) {
f96637be
JP
705 cifs_dbg(VFS, "bad search response length %zd past smb end\n",
706 de.namelen);
5bafd765
SF
707 return -EINVAL;
708 }
709
60808233 710 /* skip . and .. since we added them first */
cda0ec6a 711 if (cifs_entry_is_dot(&de, file_info->srch_inf.unicode))
60808233
SF
712 return 0;
713
f16d59b4
CH
714 if (file_info->srch_inf.unicode) {
715 struct nls_table *nlt = cifs_sb->local_nls;
b693855f
SF
716 int map_type;
717
2baa2682 718 map_type = cifs_remap(cifs_sb);
f16d59b4
CH
719 name.name = scratch_buf;
720 name.len =
acbbb76a
SF
721 cifs_from_utf16((char *)name.name, (__le16 *)de.name,
722 UNICODE_NAME_MAX,
723 min_t(size_t, de.namelen,
b693855f 724 (size_t)max_len), nlt, map_type);
f16d59b4
CH
725 name.len -= nls_nullsize(nlt);
726 } else {
727 name.name = de.name;
728 name.len = de.namelen;
729 }
1da177e4 730
9feed6f8
CH
731 switch (file_info->srch_inf.info_level) {
732 case SMB_FIND_FILE_UNIX:
cc0bad75 733 cifs_unix_basic_to_fattr(&fattr,
9feed6f8
CH
734 &((FILE_UNIX_INFO *)find_entry)->basic,
735 cifs_sb);
736 break;
737 case SMB_FIND_FILE_INFO_STANDARD:
738 cifs_std_info_to_fattr(&fattr,
739 (FIND_FILE_STANDARD_INFO *)find_entry,
740 cifs_sb);
741 break;
742 default:
743 cifs_dir_info_to_fattr(&fattr,
744 (FILE_DIRECTORY_INFO *)find_entry,
745 cifs_sb);
746 break;
747 }
b835bebe 748
f16d59b4
CH
749 if (de.ino && (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM)) {
750 fattr.cf_uniqueid = de.ino;
ec06aedd 751 } else {
0b8f18e3 752 fattr.cf_uniqueid = iunique(sb, ROOT_I);
ec06aedd
JL
753 cifs_autodisable_serverino(cifs_sb);
754 }
50c2f753 755
1b12b9c1 756 if ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MF_SYMLINKS) &&
cb084b1a 757 couldbe_mf_symlink(&fattr))
1b12b9c1
SM
758 /*
759 * trying to get the type and mode can be slow,
760 * so just call those regular files for now, and mark
761 * for reval
762 */
763 fattr.cf_flags |= CIFS_FATTR_NEED_REVAL;
764
1f1735cb 765 cifs_prime_dcache(file_dentry(file), &name, &fattr);
3870253e 766
eb1b3fa5 767 ino = cifs_uniqueid_to_ino_t(fattr.cf_uniqueid);
be4ccdcc 768 return !dir_emit(ctx, name.name, name.len, ino, fattr.cf_dtype);
1da177e4
LT
769}
770
1da177e4 771
be4ccdcc 772int cifs_readdir(struct file *file, struct dir_context *ctx)
1da177e4
LT
773{
774 int rc = 0;
6d5786a3
PS
775 unsigned int xid;
776 int i;
92fc65a7 777 struct cifs_tcon *tcon;
1da177e4 778 struct cifsFileInfo *cifsFile = NULL;
3870253e 779 char *current_entry;
1da177e4 780 int num_to_fill = 0;
3870253e 781 char *tmp_buf = NULL;
50c2f753 782 char *end_of_smb;
18295796 783 unsigned int max_len;
1da177e4 784
6d5786a3 785 xid = get_xid();
1da177e4 786
6221ddd0
SJ
787 /*
788 * Ensure FindFirst doesn't fail before doing filldir() for '.' and
789 * '..'. Otherwise we won't be able to notify VFS in case of failure.
790 */
791 if (file->private_data == NULL) {
792 rc = initiate_cifs_search(xid, file);
f96637be 793 cifs_dbg(FYI, "initiate cifs search rc %d\n", rc);
6221ddd0
SJ
794 if (rc)
795 goto rddir2_exit;
796 }
797
be4ccdcc
AV
798 if (!dir_emit_dots(file, ctx))
799 goto rddir2_exit;
1da177e4 800
be4ccdcc
AV
801 /* 1) If search is active,
802 is in current search buffer?
803 if it before then restart search
804 if after then keep searching till find it */
805
be4ccdcc
AV
806 cifsFile = file->private_data;
807 if (cifsFile->srch_inf.endOfSearch) {
808 if (cifsFile->srch_inf.emptyDir) {
809 cifs_dbg(FYI, "End of search, empty dir\n");
810 rc = 0;
1da177e4
LT
811 goto rddir2_exit;
812 }
be4ccdcc
AV
813 } /* else {
814 cifsFile->invalidHandle = true;
815 tcon->ses->server->close(xid, tcon, &cifsFile->fid);
816 } */
817
818 tcon = tlink_tcon(cifsFile->tlink);
819 rc = find_cifs_entry(xid, tcon, ctx->pos, file, &current_entry,
820 &num_to_fill);
821 if (rc) {
822 cifs_dbg(FYI, "fce error %d\n", rc);
823 goto rddir2_exit;
824 } else if (current_entry != NULL) {
825 cifs_dbg(FYI, "entry %lld found\n", ctx->pos);
826 } else {
827 cifs_dbg(FYI, "could not find entry\n");
828 goto rddir2_exit;
829 }
830 cifs_dbg(FYI, "loop through %d times filling dir for net buf %p\n",
831 num_to_fill, cifsFile->srch_inf.ntwrk_buf_start);
832 max_len = tcon->ses->server->ops->calc_smb_size(
833 cifsFile->srch_inf.ntwrk_buf_start);
834 end_of_smb = cifsFile->srch_inf.ntwrk_buf_start + max_len;
835
836 tmp_buf = kmalloc(UNICODE_NAME_MAX, GFP_KERNEL);
837 if (tmp_buf == NULL) {
838 rc = -ENOMEM;
839 goto rddir2_exit;
840 }
841
842 for (i = 0; i < num_to_fill; i++) {
843 if (current_entry == NULL) {
844 /* evaluate whether this case is an error */
845 cifs_dbg(VFS, "past SMB end, num to fill %d i %d\n",
846 num_to_fill, i);
f55fdcca
KV
847 break;
848 }
be4ccdcc
AV
849 /*
850 * if buggy server returns . and .. late do we want to
851 * check for that here?
852 */
01b9b0b2 853 *tmp_buf = 0;
be4ccdcc
AV
854 rc = cifs_filldir(current_entry, file, ctx,
855 tmp_buf, max_len);
856 if (rc) {
857 if (rc > 0)
7ca85ba7 858 rc = 0;
be4ccdcc 859 break;
1da177e4 860 }
be4ccdcc
AV
861
862 ctx->pos++;
863 if (ctx->pos ==
864 cifsFile->srch_inf.index_of_last_entry) {
865 cifs_dbg(FYI, "last entry in buf at pos %lld %s\n",
866 ctx->pos, tmp_buf);
867 cifs_save_resume_key(current_entry, cifsFile);
868 break;
869 } else
870 current_entry =
871 nxt_dir_entry(current_entry, end_of_smb,
872 cifsFile->srch_inf.info_level);
873 }
874 kfree(tmp_buf);
1da177e4
LT
875
876rddir2_exit:
6d5786a3 877 free_xid(xid);
1da177e4
LT
878 return rc;
879}