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1/*
2 * fs/cifs/readdir.c
3 *
4 * Directory search handling
5 *
6 * Copyright (C) International Business Machines Corp., 2004, 2008
7 * Copyright (C) Red Hat, Inc., 2011
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>
25#include <linux/pagemap.h>
26#include <linux/slab.h>
27#include <linux/stat.h>
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
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
43#ifdef CONFIG_CIFS_DEBUG2
44static void dump_cifs_file_struct(struct file *file, char *label)
45{
46 struct cifsFileInfo *cf;
47
48 if (file) {
49 cf = file->private_data;
50 if (cf == NULL) {
51 cifs_dbg(FYI, "empty cifs private file data\n");
52 return;
53 }
54 if (cf->invalidHandle)
55 cifs_dbg(FYI, "invalid handle\n");
56 if (cf->srch_inf.endOfSearch)
57 cifs_dbg(FYI, "end of search\n");
58 if (cf->srch_inf.emptyDir)
59 cifs_dbg(FYI, "empty dir\n");
60 }
61}
62#else
63static inline void dump_cifs_file_struct(struct file *file, char *label)
64{
65}
66#endif /* DEBUG2 */
67
68/*
69 * Attempt to preload the dcache with the results from the FIND_FIRST/NEXT
70 *
71 * Find the dentry that matches "name". If there isn't one, create one. If it's
72 * a negative dentry or the uniqueid or filetype(mode) changed,
73 * then drop it and recreate it.
74 */
75static void
76cifs_prime_dcache(struct dentry *parent, struct qstr *name,
77 struct cifs_fattr *fattr)
78{
79 struct dentry *dentry, *alias;
80 struct inode *inode;
81 struct super_block *sb = parent->d_sb;
82 struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
83 DECLARE_WAIT_QUEUE_HEAD_ONSTACK(wq);
84
85 cifs_dbg(FYI, "%s: for %s\n", __func__, name->name);
86
87 dentry = d_hash_and_lookup(parent, name);
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 }
100 if (IS_ERR(dentry))
101 return;
102 if (!d_in_lookup(dentry)) {
103 inode = d_inode(dentry);
104 if (inode) {
105 if (d_mountpoint(dentry)) {
106 dput(dentry);
107 return;
108 }
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
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)) {
122 cifs_fattr_to_inode(inode, fattr);
123 dput(dentry);
124 return;
125 }
126 }
127 d_invalidate(dentry);
128 dput(dentry);
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);
138 }
139 dput(dentry);
140}
141
142static void
143cifs_fill_common_info(struct cifs_fattr *fattr, struct cifs_sb_info *cifs_sb)
144{
145 fattr->cf_uid = cifs_sb->mnt_uid;
146 fattr->cf_gid = cifs_sb->mnt_gid;
147
148 if (fattr->cf_cifsattrs & ATTR_DIRECTORY) {
149 fattr->cf_mode = S_IFDIR | cifs_sb->mnt_dir_mode;
150 fattr->cf_dtype = DT_DIR;
151 } else {
152 fattr->cf_mode = S_IFREG | cifs_sb->mnt_file_mode;
153 fattr->cf_dtype = DT_REG;
154 }
155
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
164 /* non-unix readdir doesn't provide nlink */
165 fattr->cf_flags |= CIFS_FATTR_UNKNOWN_NLINK;
166
167 if (fattr->cf_cifsattrs & ATTR_READONLY)
168 fattr->cf_mode &= ~S_IWUGO;
169
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
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;
186 } else {
187 /*
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
191 */
192 fattr->cf_flags |= CIFS_FATTR_NEED_REVAL;
193 }
194 }
195}
196
197void
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);
205 fattr->cf_createtime = le64_to_cpu(info->CreationTime);
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}
212
213static void
214cifs_std_info_to_fattr(struct cifs_fattr *fattr, FIND_FILE_STANDARD_INFO *info,
215 struct cifs_sb_info *cifs_sb)
216{
217 int offset = cifs_sb_master_tcon(cifs_sb)->ses->server->timeAdj;
218
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);
232}
233
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,
239 unsigned int xid)
240{
241 __u16 fid;
242 int len;
243 int oplock = 0;
244 int rc;
245 struct cifs_tcon *ptcon = cifs_sb_tcon(cifs_sb);
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,
251 cifs_remap(cifs_sb);
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)) {
260 cifs_dbg(FYI, "Error closing temporary reparsepoint open\n");
261 }
262 }
263}
264 */
265
266static int
267initiate_cifs_search(const unsigned int xid, struct file *file)
268{
269 __u16 search_flags;
270 int rc = 0;
271 char *full_path = NULL;
272 struct cifsFileInfo *cifsFile;
273 struct cifs_sb_info *cifs_sb = CIFS_FILE_SB(file);
274 struct tcon_link *tlink = NULL;
275 struct cifs_tcon *tcon;
276 struct TCP_Server_Info *server;
277
278 if (file->private_data == NULL) {
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 spin_lock_init(&cifsFile->file_info_lock);
289 file->private_data = cifsFile;
290 cifsFile->tlink = cifs_get_tlink(tlink);
291 tcon = tlink_tcon(tlink);
292 } else {
293 cifsFile = file->private_data;
294 tcon = tlink_tcon(cifsFile->tlink);
295 }
296
297 server = tcon->ses->server;
298
299 if (!server->ops->query_dir_first) {
300 rc = -ENOSYS;
301 goto error_exit;
302 }
303
304 cifsFile->invalidHandle = true;
305 cifsFile->srch_inf.endOfSearch = false;
306
307 full_path = build_path_from_dentry(file_dentry(file));
308 if (full_path == NULL) {
309 rc = -ENOMEM;
310 goto error_exit;
311 }
312
313 cifs_dbg(FYI, "Full path: %s start at: %lld\n", full_path, file->f_pos);
314
315ffirst_retry:
316 /* test for Unix extensions */
317 /* but now check for them on the share/mount not on the SMB session */
318 /* if (cap_unix(tcon->ses) { */
319 if (tcon->unix_ext)
320 cifsFile->srch_inf.info_level = SMB_FIND_FILE_UNIX;
321 else if ((tcon->ses->capabilities &
322 tcon->ses->server->vals->cap_nt_find) == 0) {
323 cifsFile->srch_inf.info_level = SMB_FIND_FILE_INFO_STANDARD;
324 } else if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM) {
325 cifsFile->srch_inf.info_level = SMB_FIND_FILE_ID_FULL_DIR_INFO;
326 } else /* not srvinos - BB fixme add check for backlevel? */ {
327 cifsFile->srch_inf.info_level = SMB_FIND_FILE_DIRECTORY_INFO;
328 }
329
330 search_flags = CIFS_SEARCH_CLOSE_AT_END | CIFS_SEARCH_RETURN_RESUME;
331 if (backup_cred(cifs_sb))
332 search_flags |= CIFS_SEARCH_BACKUP_SEARCH;
333
334 rc = server->ops->query_dir_first(xid, tcon, full_path, cifs_sb,
335 &cifsFile->fid, search_flags,
336 &cifsFile->srch_inf);
337
338 if (rc == 0)
339 cifsFile->invalidHandle = false;
340 /* BB add following call to handle readdir on new NTFS symlink errors
341 else if STATUS_STOPPED_ON_SYMLINK
342 call get_symlink_reparse_path and retry with new path */
343 else if ((rc == -EOPNOTSUPP) &&
344 (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM)) {
345 cifs_sb->mnt_cifs_flags &= ~CIFS_MOUNT_SERVER_INUM;
346 goto ffirst_retry;
347 }
348error_exit:
349 kfree(full_path);
350 cifs_put_tlink(tlink);
351 return rc;
352}
353
354/* return length of unicode string in bytes */
355static int cifs_unicode_bytelen(const char *str)
356{
357 int len;
358 const __le16 *ustr = (const __le16 *)str;
359
360 for (len = 0; len <= PATH_MAX; len++) {
361 if (ustr[len] == 0)
362 return len << 1;
363 }
364 cifs_dbg(FYI, "Unicode string longer than PATH_MAX found\n");
365 return len << 1;
366}
367
368static char *nxt_dir_entry(char *old_entry, char *end_of_smb, int level)
369{
370 char *new_entry;
371 FILE_DIRECTORY_INFO *pDirInfo = (FILE_DIRECTORY_INFO *)old_entry;
372
373 if (level == SMB_FIND_FILE_INFO_STANDARD) {
374 FIND_FILE_STANDARD_INFO *pfData;
375 pfData = (FIND_FILE_STANDARD_INFO *)pDirInfo;
376
377 new_entry = old_entry + sizeof(FIND_FILE_STANDARD_INFO) +
378 pfData->FileNameLength;
379 } else
380 new_entry = old_entry + le32_to_cpu(pDirInfo->NextEntryOffset);
381 cifs_dbg(FYI, "new entry %p old entry %p\n", new_entry, old_entry);
382 /* validate that new_entry is not past end of SMB */
383 if (new_entry >= end_of_smb) {
384 cifs_dbg(VFS, "search entry %p began after end of SMB %p old entry %p\n",
385 new_entry, end_of_smb, old_entry);
386 return NULL;
387 } else if (((level == SMB_FIND_FILE_INFO_STANDARD) &&
388 (new_entry + sizeof(FIND_FILE_STANDARD_INFO) > end_of_smb))
389 || ((level != SMB_FIND_FILE_INFO_STANDARD) &&
390 (new_entry + sizeof(FILE_DIRECTORY_INFO) > end_of_smb))) {
391 cifs_dbg(VFS, "search entry %p extends after end of SMB %p\n",
392 new_entry, end_of_smb);
393 return NULL;
394 } else
395 return new_entry;
396
397}
398
399struct cifs_dirent {
400 const char *name;
401 size_t namelen;
402 u32 resume_key;
403 u64 ino;
404};
405
406static void cifs_fill_dirent_unix(struct cifs_dirent *de,
407 const FILE_UNIX_INFO *info, bool is_unicode)
408{
409 de->name = &info->FileName[0];
410 if (is_unicode)
411 de->namelen = cifs_unicode_bytelen(de->name);
412 else
413 de->namelen = strnlen(de->name, PATH_MAX);
414 de->resume_key = info->ResumeKey;
415 de->ino = le64_to_cpu(info->basic.UniqueId);
416}
417
418static void cifs_fill_dirent_dir(struct cifs_dirent *de,
419 const FILE_DIRECTORY_INFO *info)
420{
421 de->name = &info->FileName[0];
422 de->namelen = le32_to_cpu(info->FileNameLength);
423 de->resume_key = info->FileIndex;
424}
425
426static void cifs_fill_dirent_full(struct cifs_dirent *de,
427 const FILE_FULL_DIRECTORY_INFO *info)
428{
429 de->name = &info->FileName[0];
430 de->namelen = le32_to_cpu(info->FileNameLength);
431 de->resume_key = info->FileIndex;
432}
433
434static void cifs_fill_dirent_search(struct cifs_dirent *de,
435 const SEARCH_ID_FULL_DIR_INFO *info)
436{
437 de->name = &info->FileName[0];
438 de->namelen = le32_to_cpu(info->FileNameLength);
439 de->resume_key = info->FileIndex;
440 de->ino = le64_to_cpu(info->UniqueId);
441}
442
443static void cifs_fill_dirent_both(struct cifs_dirent *de,
444 const FILE_BOTH_DIRECTORY_INFO *info)
445{
446 de->name = &info->FileName[0];
447 de->namelen = le32_to_cpu(info->FileNameLength);
448 de->resume_key = info->FileIndex;
449}
450
451static void cifs_fill_dirent_std(struct cifs_dirent *de,
452 const FIND_FILE_STANDARD_INFO *info)
453{
454 de->name = &info->FileName[0];
455 /* one byte length, no endianess conversion */
456 de->namelen = info->FileNameLength;
457 de->resume_key = info->ResumeKey;
458}
459
460static int cifs_fill_dirent(struct cifs_dirent *de, const void *info,
461 u16 level, bool is_unicode)
462{
463 memset(de, 0, sizeof(*de));
464
465 switch (level) {
466 case SMB_FIND_FILE_UNIX:
467 cifs_fill_dirent_unix(de, info, is_unicode);
468 break;
469 case SMB_FIND_FILE_DIRECTORY_INFO:
470 cifs_fill_dirent_dir(de, info);
471 break;
472 case SMB_FIND_FILE_FULL_DIRECTORY_INFO:
473 cifs_fill_dirent_full(de, info);
474 break;
475 case SMB_FIND_FILE_ID_FULL_DIR_INFO:
476 cifs_fill_dirent_search(de, info);
477 break;
478 case SMB_FIND_FILE_BOTH_DIRECTORY_INFO:
479 cifs_fill_dirent_both(de, info);
480 break;
481 case SMB_FIND_FILE_INFO_STANDARD:
482 cifs_fill_dirent_std(de, info);
483 break;
484 default:
485 cifs_dbg(FYI, "Unknown findfirst level %d\n", level);
486 return -EINVAL;
487 }
488
489 return 0;
490}
491
492#define UNICODE_DOT cpu_to_le16(0x2e)
493
494/* return 0 if no match and 1 for . (current directory) and 2 for .. (parent) */
495static int cifs_entry_is_dot(struct cifs_dirent *de, bool is_unicode)
496{
497 int rc = 0;
498
499 if (!de->name)
500 return 0;
501
502 if (is_unicode) {
503 __le16 *ufilename = (__le16 *)de->name;
504 if (de->namelen == 2) {
505 /* check for . */
506 if (ufilename[0] == UNICODE_DOT)
507 rc = 1;
508 } else if (de->namelen == 4) {
509 /* check for .. */
510 if (ufilename[0] == UNICODE_DOT &&
511 ufilename[1] == UNICODE_DOT)
512 rc = 2;
513 }
514 } else /* ASCII */ {
515 if (de->namelen == 1) {
516 if (de->name[0] == '.')
517 rc = 1;
518 } else if (de->namelen == 2) {
519 if (de->name[0] == '.' && de->name[1] == '.')
520 rc = 2;
521 }
522 }
523
524 return rc;
525}
526
527/* Check if directory that we are searching has changed so we can decide
528 whether we can use the cached search results from the previous search */
529static int is_dir_changed(struct file *file)
530{
531 struct inode *inode = file_inode(file);
532 struct cifsInodeInfo *cifsInfo = CIFS_I(inode);
533
534 if (cifsInfo->time == 0)
535 return 1; /* directory was changed, perhaps due to unlink */
536 else
537 return 0;
538
539}
540
541static int cifs_save_resume_key(const char *current_entry,
542 struct cifsFileInfo *file_info)
543{
544 struct cifs_dirent de;
545 int rc;
546
547 rc = cifs_fill_dirent(&de, current_entry, file_info->srch_inf.info_level,
548 file_info->srch_inf.unicode);
549 if (!rc) {
550 file_info->srch_inf.presume_name = de.name;
551 file_info->srch_inf.resume_name_len = de.namelen;
552 file_info->srch_inf.resume_key = de.resume_key;
553 }
554 return rc;
555}
556
557/*
558 * Find the corresponding entry in the search. Note that the SMB server returns
559 * search entries for . and .. which complicates logic here if we choose to
560 * parse for them and we do not assume that they are located in the findfirst
561 * return buffer. We start counting in the buffer with entry 2 and increment for
562 * every entry (do not increment for . or .. entry).
563 */
564static int
565find_cifs_entry(const unsigned int xid, struct cifs_tcon *tcon, loff_t pos,
566 struct file *file, char **current_entry, int *num_to_ret)
567{
568 __u16 search_flags;
569 int rc = 0;
570 int pos_in_buf = 0;
571 loff_t first_entry_in_buffer;
572 loff_t index_to_find = pos;
573 struct cifsFileInfo *cfile = file->private_data;
574 struct cifs_sb_info *cifs_sb = CIFS_FILE_SB(file);
575 struct TCP_Server_Info *server = tcon->ses->server;
576 /* check if index in the buffer */
577
578 if (!server->ops->query_dir_first || !server->ops->query_dir_next)
579 return -ENOSYS;
580
581 if ((cfile == NULL) || (current_entry == NULL) || (num_to_ret == NULL))
582 return -ENOENT;
583
584 *current_entry = NULL;
585 first_entry_in_buffer = cfile->srch_inf.index_of_last_entry -
586 cfile->srch_inf.entries_in_buffer;
587
588 /*
589 * If first entry in buf is zero then is first buffer
590 * in search response data which means it is likely . and ..
591 * will be in this buffer, although some servers do not return
592 * . and .. for the root of a drive and for those we need
593 * to start two entries earlier.
594 */
595
596 dump_cifs_file_struct(file, "In fce ");
597 if (((index_to_find < cfile->srch_inf.index_of_last_entry) &&
598 is_dir_changed(file)) || (index_to_find < first_entry_in_buffer)) {
599 /* close and restart search */
600 cifs_dbg(FYI, "search backing up - close and restart search\n");
601 spin_lock(&cfile->file_info_lock);
602 if (server->ops->dir_needs_close(cfile)) {
603 cfile->invalidHandle = true;
604 spin_unlock(&cfile->file_info_lock);
605 if (server->ops->close_dir)
606 server->ops->close_dir(xid, tcon, &cfile->fid);
607 } else
608 spin_unlock(&cfile->file_info_lock);
609 if (cfile->srch_inf.ntwrk_buf_start) {
610 cifs_dbg(FYI, "freeing SMB ff cache buf on search rewind\n");
611 if (cfile->srch_inf.smallBuf)
612 cifs_small_buf_release(cfile->srch_inf.
613 ntwrk_buf_start);
614 else
615 cifs_buf_release(cfile->srch_inf.
616 ntwrk_buf_start);
617 cfile->srch_inf.ntwrk_buf_start = NULL;
618 }
619 rc = initiate_cifs_search(xid, file);
620 if (rc) {
621 cifs_dbg(FYI, "error %d reinitiating a search on rewind\n",
622 rc);
623 return rc;
624 }
625 /* FindFirst/Next set last_entry to NULL on malformed reply */
626 if (cfile->srch_inf.last_entry)
627 cifs_save_resume_key(cfile->srch_inf.last_entry, cfile);
628 }
629
630 search_flags = CIFS_SEARCH_CLOSE_AT_END | CIFS_SEARCH_RETURN_RESUME;
631 if (backup_cred(cifs_sb))
632 search_flags |= CIFS_SEARCH_BACKUP_SEARCH;
633
634 while ((index_to_find >= cfile->srch_inf.index_of_last_entry) &&
635 (rc == 0) && !cfile->srch_inf.endOfSearch) {
636 cifs_dbg(FYI, "calling findnext2\n");
637 rc = server->ops->query_dir_next(xid, tcon, &cfile->fid,
638 search_flags,
639 &cfile->srch_inf);
640 /* FindFirst/Next set last_entry to NULL on malformed reply */
641 if (cfile->srch_inf.last_entry)
642 cifs_save_resume_key(cfile->srch_inf.last_entry, cfile);
643 if (rc)
644 return -ENOENT;
645 }
646 if (index_to_find < cfile->srch_inf.index_of_last_entry) {
647 /* we found the buffer that contains the entry */
648 /* scan and find it */
649 int i;
650 char *cur_ent;
651 char *end_of_smb = cfile->srch_inf.ntwrk_buf_start +
652 server->ops->calc_smb_size(
653 cfile->srch_inf.ntwrk_buf_start);
654
655 cur_ent = cfile->srch_inf.srch_entries_start;
656 first_entry_in_buffer = cfile->srch_inf.index_of_last_entry
657 - cfile->srch_inf.entries_in_buffer;
658 pos_in_buf = index_to_find - first_entry_in_buffer;
659 cifs_dbg(FYI, "found entry - pos_in_buf %d\n", pos_in_buf);
660
661 for (i = 0; (i < (pos_in_buf)) && (cur_ent != NULL); i++) {
662 /* go entry by entry figuring out which is first */
663 cur_ent = nxt_dir_entry(cur_ent, end_of_smb,
664 cfile->srch_inf.info_level);
665 }
666 if ((cur_ent == NULL) && (i < pos_in_buf)) {
667 /* BB fixme - check if we should flag this error */
668 cifs_dbg(VFS, "reached end of buf searching for pos in buf %d index to find %lld rc %d\n",
669 pos_in_buf, index_to_find, rc);
670 }
671 rc = 0;
672 *current_entry = cur_ent;
673 } else {
674 cifs_dbg(FYI, "index not in buffer - could not findnext into it\n");
675 return 0;
676 }
677
678 if (pos_in_buf >= cfile->srch_inf.entries_in_buffer) {
679 cifs_dbg(FYI, "can not return entries pos_in_buf beyond last\n");
680 *num_to_ret = 0;
681 } else
682 *num_to_ret = cfile->srch_inf.entries_in_buffer - pos_in_buf;
683
684 return rc;
685}
686
687static int cifs_filldir(char *find_entry, struct file *file,
688 struct dir_context *ctx,
689 char *scratch_buf, unsigned int max_len)
690{
691 struct cifsFileInfo *file_info = file->private_data;
692 struct super_block *sb = file_inode(file)->i_sb;
693 struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
694 struct cifs_dirent de = { NULL, };
695 struct cifs_fattr fattr;
696 struct qstr name;
697 int rc = 0;
698 ino_t ino;
699
700 rc = cifs_fill_dirent(&de, find_entry, file_info->srch_inf.info_level,
701 file_info->srch_inf.unicode);
702 if (rc)
703 return rc;
704
705 if (de.namelen > max_len) {
706 cifs_dbg(VFS, "bad search response length %zd past smb end\n",
707 de.namelen);
708 return -EINVAL;
709 }
710
711 /* skip . and .. since we added them first */
712 if (cifs_entry_is_dot(&de, file_info->srch_inf.unicode))
713 return 0;
714
715 if (file_info->srch_inf.unicode) {
716 struct nls_table *nlt = cifs_sb->local_nls;
717 int map_type;
718
719 map_type = cifs_remap(cifs_sb);
720 name.name = scratch_buf;
721 name.len =
722 cifs_from_utf16((char *)name.name, (__le16 *)de.name,
723 UNICODE_NAME_MAX,
724 min_t(size_t, de.namelen,
725 (size_t)max_len), nlt, map_type);
726 name.len -= nls_nullsize(nlt);
727 } else {
728 name.name = de.name;
729 name.len = de.namelen;
730 }
731
732 switch (file_info->srch_inf.info_level) {
733 case SMB_FIND_FILE_UNIX:
734 cifs_unix_basic_to_fattr(&fattr,
735 &((FILE_UNIX_INFO *)find_entry)->basic,
736 cifs_sb);
737 break;
738 case SMB_FIND_FILE_INFO_STANDARD:
739 cifs_std_info_to_fattr(&fattr,
740 (FIND_FILE_STANDARD_INFO *)find_entry,
741 cifs_sb);
742 break;
743 default:
744 cifs_dir_info_to_fattr(&fattr,
745 (FILE_DIRECTORY_INFO *)find_entry,
746 cifs_sb);
747 break;
748 }
749
750 if (de.ino && (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM)) {
751 fattr.cf_uniqueid = de.ino;
752 } else {
753 fattr.cf_uniqueid = iunique(sb, ROOT_I);
754 cifs_autodisable_serverino(cifs_sb);
755 }
756
757 if ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MF_SYMLINKS) &&
758 couldbe_mf_symlink(&fattr))
759 /*
760 * trying to get the type and mode can be slow,
761 * so just call those regular files for now, and mark
762 * for reval
763 */
764 fattr.cf_flags |= CIFS_FATTR_NEED_REVAL;
765
766 cifs_prime_dcache(file_dentry(file), &name, &fattr);
767
768 ino = cifs_uniqueid_to_ino_t(fattr.cf_uniqueid);
769 return !dir_emit(ctx, name.name, name.len, ino, fattr.cf_dtype);
770}
771
772
773int cifs_readdir(struct file *file, struct dir_context *ctx)
774{
775 int rc = 0;
776 unsigned int xid;
777 int i;
778 struct cifs_tcon *tcon;
779 struct cifsFileInfo *cifsFile = NULL;
780 char *current_entry;
781 int num_to_fill = 0;
782 char *tmp_buf = NULL;
783 char *end_of_smb;
784 unsigned int max_len;
785
786 xid = get_xid();
787
788 /*
789 * Ensure FindFirst doesn't fail before doing filldir() for '.' and
790 * '..'. Otherwise we won't be able to notify VFS in case of failure.
791 */
792 if (file->private_data == NULL) {
793 rc = initiate_cifs_search(xid, file);
794 cifs_dbg(FYI, "initiate cifs search rc %d\n", rc);
795 if (rc)
796 goto rddir2_exit;
797 }
798
799 if (!dir_emit_dots(file, ctx))
800 goto rddir2_exit;
801
802 /* 1) If search is active,
803 is in current search buffer?
804 if it before then restart search
805 if after then keep searching till find it */
806
807 cifsFile = file->private_data;
808 if (cifsFile->srch_inf.endOfSearch) {
809 if (cifsFile->srch_inf.emptyDir) {
810 cifs_dbg(FYI, "End of search, empty dir\n");
811 rc = 0;
812 goto rddir2_exit;
813 }
814 } /* else {
815 cifsFile->invalidHandle = true;
816 tcon->ses->server->close(xid, tcon, &cifsFile->fid);
817 } */
818
819 tcon = tlink_tcon(cifsFile->tlink);
820 rc = find_cifs_entry(xid, tcon, ctx->pos, file, ¤t_entry,
821 &num_to_fill);
822 if (rc) {
823 cifs_dbg(FYI, "fce error %d\n", rc);
824 goto rddir2_exit;
825 } else if (current_entry != NULL) {
826 cifs_dbg(FYI, "entry %lld found\n", ctx->pos);
827 } else {
828 cifs_dbg(FYI, "could not find entry\n");
829 goto rddir2_exit;
830 }
831 cifs_dbg(FYI, "loop through %d times filling dir for net buf %p\n",
832 num_to_fill, cifsFile->srch_inf.ntwrk_buf_start);
833 max_len = tcon->ses->server->ops->calc_smb_size(
834 cifsFile->srch_inf.ntwrk_buf_start);
835 end_of_smb = cifsFile->srch_inf.ntwrk_buf_start + max_len;
836
837 tmp_buf = kmalloc(UNICODE_NAME_MAX, GFP_KERNEL);
838 if (tmp_buf == NULL) {
839 rc = -ENOMEM;
840 goto rddir2_exit;
841 }
842
843 for (i = 0; i < num_to_fill; i++) {
844 if (current_entry == NULL) {
845 /* evaluate whether this case is an error */
846 cifs_dbg(VFS, "past SMB end, num to fill %d i %d\n",
847 num_to_fill, i);
848 break;
849 }
850 /*
851 * if buggy server returns . and .. late do we want to
852 * check for that here?
853 */
854 *tmp_buf = 0;
855 rc = cifs_filldir(current_entry, file, ctx,
856 tmp_buf, max_len);
857 if (rc) {
858 if (rc > 0)
859 rc = 0;
860 break;
861 }
862
863 ctx->pos++;
864 if (ctx->pos ==
865 cifsFile->srch_inf.index_of_last_entry) {
866 cifs_dbg(FYI, "last entry in buf at pos %lld %s\n",
867 ctx->pos, tmp_buf);
868 cifs_save_resume_key(current_entry, cifsFile);
869 break;
870 } else
871 current_entry =
872 nxt_dir_entry(current_entry, end_of_smb,
873 cifsFile->srch_inf.info_level);
874 }
875 kfree(tmp_buf);
876
877rddir2_exit:
878 free_xid(xid);
879 return rc;
880}
1// SPDX-License-Identifier: LGPL-2.1
2/*
3 *
4 * Directory search handling
5 *
6 * Copyright (C) International Business Machines Corp., 2004, 2008
7 * Copyright (C) Red Hat, Inc., 2011
8 * Author(s): Steve French (sfrench@us.ibm.com)
9 *
10 */
11#include <linux/fs.h>
12#include <linux/pagemap.h>
13#include <linux/slab.h>
14#include <linux/stat.h>
15#include "cifspdu.h"
16#include "cifsglob.h"
17#include "cifsproto.h"
18#include "cifs_unicode.h"
19#include "cifs_debug.h"
20#include "cifs_fs_sb.h"
21#include "cifsfs.h"
22#include "smb2proto.h"
23#include "fs_context.h"
24#include "cached_dir.h"
25
26/*
27 * To be safe - for UCS to UTF-8 with strings loaded with the rare long
28 * characters alloc more to account for such multibyte target UTF-8
29 * characters.
30 */
31#define UNICODE_NAME_MAX ((4 * NAME_MAX) + 2)
32
33#ifdef CONFIG_CIFS_DEBUG2
34static void dump_cifs_file_struct(struct file *file, char *label)
35{
36 struct cifsFileInfo *cf;
37
38 if (file) {
39 cf = file->private_data;
40 if (cf == NULL) {
41 cifs_dbg(FYI, "empty cifs private file data\n");
42 return;
43 }
44 if (cf->invalidHandle)
45 cifs_dbg(FYI, "Invalid handle\n");
46 if (cf->srch_inf.endOfSearch)
47 cifs_dbg(FYI, "end of search\n");
48 if (cf->srch_inf.emptyDir)
49 cifs_dbg(FYI, "empty dir\n");
50 }
51}
52#else
53static inline void dump_cifs_file_struct(struct file *file, char *label)
54{
55}
56#endif /* DEBUG2 */
57
58/*
59 * Attempt to preload the dcache with the results from the FIND_FIRST/NEXT
60 *
61 * Find the dentry that matches "name". If there isn't one, create one. If it's
62 * a negative dentry or the uniqueid or filetype(mode) changed,
63 * then drop it and recreate it.
64 */
65static void
66cifs_prime_dcache(struct dentry *parent, struct qstr *name,
67 struct cifs_fattr *fattr)
68{
69 struct dentry *dentry, *alias;
70 struct inode *inode;
71 struct super_block *sb = parent->d_sb;
72 struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
73 DECLARE_WAIT_QUEUE_HEAD_ONSTACK(wq);
74
75 cifs_dbg(FYI, "%s: for %s\n", __func__, name->name);
76
77 dentry = d_hash_and_lookup(parent, name);
78 if (!dentry) {
79 /*
80 * If we know that the inode will need to be revalidated
81 * immediately, then don't create a new dentry for it.
82 * We'll end up doing an on the wire call either way and
83 * this spares us an invalidation.
84 */
85 if (fattr->cf_flags & CIFS_FATTR_NEED_REVAL)
86 return;
87retry:
88 dentry = d_alloc_parallel(parent, name, &wq);
89 }
90 if (IS_ERR(dentry))
91 return;
92 if (!d_in_lookup(dentry)) {
93 inode = d_inode(dentry);
94 if (inode) {
95 if (d_mountpoint(dentry)) {
96 dput(dentry);
97 return;
98 }
99 /*
100 * If we're generating inode numbers, then we don't
101 * want to clobber the existing one with the one that
102 * the readdir code created.
103 */
104 if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM))
105 fattr->cf_uniqueid = CIFS_I(inode)->uniqueid;
106
107 /* update inode in place
108 * if both i_ino and i_mode didn't change */
109 if (CIFS_I(inode)->uniqueid == fattr->cf_uniqueid &&
110 cifs_fattr_to_inode(inode, fattr) == 0) {
111 dput(dentry);
112 return;
113 }
114 }
115 d_invalidate(dentry);
116 dput(dentry);
117 goto retry;
118 } else {
119 inode = cifs_iget(sb, fattr);
120 if (!inode)
121 inode = ERR_PTR(-ENOMEM);
122 alias = d_splice_alias(inode, dentry);
123 d_lookup_done(dentry);
124 if (alias && !IS_ERR(alias))
125 dput(alias);
126 }
127 dput(dentry);
128}
129
130static bool reparse_file_needs_reval(const struct cifs_fattr *fattr)
131{
132 if (!(fattr->cf_cifsattrs & ATTR_REPARSE))
133 return false;
134 /*
135 * The DFS tags should be only intepreted by server side as per
136 * MS-FSCC 2.1.2.1, but let's include them anyway.
137 *
138 * Besides, if cf_cifstag is unset (0), then we still need it to be
139 * revalidated to know exactly what reparse point it is.
140 */
141 switch (fattr->cf_cifstag) {
142 case IO_REPARSE_TAG_DFS:
143 case IO_REPARSE_TAG_DFSR:
144 case IO_REPARSE_TAG_SYMLINK:
145 case IO_REPARSE_TAG_NFS:
146 case 0:
147 return true;
148 }
149 return false;
150}
151
152static void
153cifs_fill_common_info(struct cifs_fattr *fattr, struct cifs_sb_info *cifs_sb)
154{
155 fattr->cf_uid = cifs_sb->ctx->linux_uid;
156 fattr->cf_gid = cifs_sb->ctx->linux_gid;
157
158 /*
159 * The IO_REPARSE_TAG_LX_ tags originally were used by WSL but they
160 * are preferred by the Linux client in some cases since, unlike
161 * the NFS reparse tag (or EAs), they don't require an extra query
162 * to determine which type of special file they represent.
163 * TODO: go through all documented reparse tags to see if we can
164 * reasonably map some of them to directories vs. files vs. symlinks
165 */
166 if (fattr->cf_cifsattrs & ATTR_DIRECTORY) {
167 fattr->cf_mode = S_IFDIR | cifs_sb->ctx->dir_mode;
168 fattr->cf_dtype = DT_DIR;
169 } else if (fattr->cf_cifstag == IO_REPARSE_TAG_LX_SYMLINK) {
170 fattr->cf_mode |= S_IFLNK | cifs_sb->ctx->file_mode;
171 fattr->cf_dtype = DT_LNK;
172 } else if (fattr->cf_cifstag == IO_REPARSE_TAG_LX_FIFO) {
173 fattr->cf_mode |= S_IFIFO | cifs_sb->ctx->file_mode;
174 fattr->cf_dtype = DT_FIFO;
175 } else if (fattr->cf_cifstag == IO_REPARSE_TAG_AF_UNIX) {
176 fattr->cf_mode |= S_IFSOCK | cifs_sb->ctx->file_mode;
177 fattr->cf_dtype = DT_SOCK;
178 } else if (fattr->cf_cifstag == IO_REPARSE_TAG_LX_CHR) {
179 fattr->cf_mode |= S_IFCHR | cifs_sb->ctx->file_mode;
180 fattr->cf_dtype = DT_CHR;
181 } else if (fattr->cf_cifstag == IO_REPARSE_TAG_LX_BLK) {
182 fattr->cf_mode |= S_IFBLK | cifs_sb->ctx->file_mode;
183 fattr->cf_dtype = DT_BLK;
184 } else { /* TODO: should we mark some other reparse points (like DFSR) as directories? */
185 fattr->cf_mode = S_IFREG | cifs_sb->ctx->file_mode;
186 fattr->cf_dtype = DT_REG;
187 }
188
189 /*
190 * We need to revalidate it further to make a decision about whether it
191 * is a symbolic link, DFS referral or a reparse point with a direct
192 * access like junctions, deduplicated files, NFS symlinks.
193 */
194 if (reparse_file_needs_reval(fattr))
195 fattr->cf_flags |= CIFS_FATTR_NEED_REVAL;
196
197 /* non-unix readdir doesn't provide nlink */
198 fattr->cf_flags |= CIFS_FATTR_UNKNOWN_NLINK;
199
200 if (fattr->cf_cifsattrs & ATTR_READONLY)
201 fattr->cf_mode &= ~S_IWUGO;
202
203 /*
204 * We of course don't get ACL info in FIND_FIRST/NEXT results, so
205 * mark it for revalidation so that "ls -l" will look right. It might
206 * be super-slow, but if we don't do this then the ownership of files
207 * may look wrong since the inodes may not have timed out by the time
208 * "ls" does a stat() call on them.
209 */
210 if ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_CIFS_ACL) ||
211 (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MODE_FROM_SID))
212 fattr->cf_flags |= CIFS_FATTR_NEED_REVAL;
213
214 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_UNX_EMUL &&
215 fattr->cf_cifsattrs & ATTR_SYSTEM) {
216 if (fattr->cf_eof == 0) {
217 fattr->cf_mode &= ~S_IFMT;
218 fattr->cf_mode |= S_IFIFO;
219 fattr->cf_dtype = DT_FIFO;
220 } else {
221 /*
222 * trying to get the type and mode via SFU can be slow,
223 * so just call those regular files for now, and mark
224 * for reval
225 */
226 fattr->cf_flags |= CIFS_FATTR_NEED_REVAL;
227 }
228 }
229}
230
231/* Fill a cifs_fattr struct with info from SMB_FIND_FILE_POSIX_INFO. */
232static void
233cifs_posix_to_fattr(struct cifs_fattr *fattr, struct smb2_posix_info *info,
234 struct cifs_sb_info *cifs_sb)
235{
236 struct smb2_posix_info_parsed parsed;
237
238 posix_info_parse(info, NULL, &parsed);
239
240 memset(fattr, 0, sizeof(*fattr));
241 fattr->cf_uniqueid = le64_to_cpu(info->Inode);
242 fattr->cf_bytes = le64_to_cpu(info->AllocationSize);
243 fattr->cf_eof = le64_to_cpu(info->EndOfFile);
244
245 fattr->cf_atime = cifs_NTtimeToUnix(info->LastAccessTime);
246 fattr->cf_mtime = cifs_NTtimeToUnix(info->LastWriteTime);
247 fattr->cf_ctime = cifs_NTtimeToUnix(info->CreationTime);
248
249 fattr->cf_nlink = le32_to_cpu(info->HardLinks);
250 fattr->cf_cifsattrs = le32_to_cpu(info->DosAttributes);
251
252 /*
253 * Since we set the inode type below we need to mask off
254 * to avoid strange results if bits set above.
255 * XXX: why not make server&client use the type bits?
256 */
257 fattr->cf_mode = le32_to_cpu(info->Mode) & ~S_IFMT;
258
259 cifs_dbg(FYI, "posix fattr: dev %d, reparse %d, mode %o\n",
260 le32_to_cpu(info->DeviceId),
261 le32_to_cpu(info->ReparseTag),
262 le32_to_cpu(info->Mode));
263
264 if (fattr->cf_cifsattrs & ATTR_DIRECTORY) {
265 fattr->cf_mode |= S_IFDIR;
266 fattr->cf_dtype = DT_DIR;
267 } else {
268 /*
269 * mark anything that is not a dir as regular
270 * file. special files should have the REPARSE
271 * attribute and will be marked as needing revaluation
272 */
273 fattr->cf_mode |= S_IFREG;
274 fattr->cf_dtype = DT_REG;
275 }
276
277 if (reparse_file_needs_reval(fattr))
278 fattr->cf_flags |= CIFS_FATTR_NEED_REVAL;
279
280 sid_to_id(cifs_sb, &parsed.owner, fattr, SIDOWNER);
281 sid_to_id(cifs_sb, &parsed.group, fattr, SIDGROUP);
282}
283
284static void __dir_info_to_fattr(struct cifs_fattr *fattr, const void *info)
285{
286 const FILE_DIRECTORY_INFO *fi = info;
287
288 memset(fattr, 0, sizeof(*fattr));
289 fattr->cf_cifsattrs = le32_to_cpu(fi->ExtFileAttributes);
290 fattr->cf_eof = le64_to_cpu(fi->EndOfFile);
291 fattr->cf_bytes = le64_to_cpu(fi->AllocationSize);
292 fattr->cf_createtime = le64_to_cpu(fi->CreationTime);
293 fattr->cf_atime = cifs_NTtimeToUnix(fi->LastAccessTime);
294 fattr->cf_ctime = cifs_NTtimeToUnix(fi->ChangeTime);
295 fattr->cf_mtime = cifs_NTtimeToUnix(fi->LastWriteTime);
296}
297
298void
299cifs_dir_info_to_fattr(struct cifs_fattr *fattr, FILE_DIRECTORY_INFO *info,
300 struct cifs_sb_info *cifs_sb)
301{
302 __dir_info_to_fattr(fattr, info);
303 cifs_fill_common_info(fattr, cifs_sb);
304}
305
306static void cifs_fulldir_info_to_fattr(struct cifs_fattr *fattr,
307 SEARCH_ID_FULL_DIR_INFO *info,
308 struct cifs_sb_info *cifs_sb)
309{
310 __dir_info_to_fattr(fattr, info);
311
312 /* See MS-FSCC 2.4.19 FileIdFullDirectoryInformation */
313 if (fattr->cf_cifsattrs & ATTR_REPARSE)
314 fattr->cf_cifstag = le32_to_cpu(info->EaSize);
315 cifs_fill_common_info(fattr, cifs_sb);
316}
317
318static void
319cifs_std_info_to_fattr(struct cifs_fattr *fattr, FIND_FILE_STANDARD_INFO *info,
320 struct cifs_sb_info *cifs_sb)
321{
322 int offset = cifs_sb_master_tcon(cifs_sb)->ses->server->timeAdj;
323
324 memset(fattr, 0, sizeof(*fattr));
325 fattr->cf_atime = cnvrtDosUnixTm(info->LastAccessDate,
326 info->LastAccessTime, offset);
327 fattr->cf_ctime = cnvrtDosUnixTm(info->LastWriteDate,
328 info->LastWriteTime, offset);
329 fattr->cf_mtime = cnvrtDosUnixTm(info->LastWriteDate,
330 info->LastWriteTime, offset);
331
332 fattr->cf_cifsattrs = le16_to_cpu(info->Attributes);
333 fattr->cf_bytes = le32_to_cpu(info->AllocationSize);
334 fattr->cf_eof = le32_to_cpu(info->DataSize);
335
336 cifs_fill_common_info(fattr, cifs_sb);
337}
338
339/* BB eventually need to add the following helper function to
340 resolve NT_STATUS_STOPPED_ON_SYMLINK return code when
341 we try to do FindFirst on (NTFS) directory symlinks */
342/*
343int get_symlink_reparse_path(char *full_path, struct cifs_sb_info *cifs_sb,
344 unsigned int xid)
345{
346 __u16 fid;
347 int len;
348 int oplock = 0;
349 int rc;
350 struct cifs_tcon *ptcon = cifs_sb_tcon(cifs_sb);
351 char *tmpbuffer;
352
353 rc = CIFSSMBOpen(xid, ptcon, full_path, FILE_OPEN, GENERIC_READ,
354 OPEN_REPARSE_POINT, &fid, &oplock, NULL,
355 cifs_sb->local_nls,
356 cifs_remap(cifs_sb);
357 if (!rc) {
358 tmpbuffer = kmalloc(maxpath);
359 rc = CIFSSMBQueryReparseLinkInfo(xid, ptcon, full_path,
360 tmpbuffer,
361 maxpath -1,
362 fid,
363 cifs_sb->local_nls);
364 if (CIFSSMBClose(xid, ptcon, fid)) {
365 cifs_dbg(FYI, "Error closing temporary reparsepoint open\n");
366 }
367 }
368}
369 */
370
371static int
372_initiate_cifs_search(const unsigned int xid, struct file *file,
373 const char *full_path)
374{
375 __u16 search_flags;
376 int rc = 0;
377 struct cifsFileInfo *cifsFile;
378 struct cifs_sb_info *cifs_sb = CIFS_FILE_SB(file);
379 struct tcon_link *tlink = NULL;
380 struct cifs_tcon *tcon;
381 struct TCP_Server_Info *server;
382
383 if (file->private_data == NULL) {
384 tlink = cifs_sb_tlink(cifs_sb);
385 if (IS_ERR(tlink))
386 return PTR_ERR(tlink);
387
388 cifsFile = kzalloc(sizeof(struct cifsFileInfo), GFP_KERNEL);
389 if (cifsFile == NULL) {
390 rc = -ENOMEM;
391 goto error_exit;
392 }
393 spin_lock_init(&cifsFile->file_info_lock);
394 file->private_data = cifsFile;
395 cifsFile->tlink = cifs_get_tlink(tlink);
396 tcon = tlink_tcon(tlink);
397 } else {
398 cifsFile = file->private_data;
399 tcon = tlink_tcon(cifsFile->tlink);
400 }
401
402 server = tcon->ses->server;
403
404 if (!server->ops->query_dir_first) {
405 rc = -ENOSYS;
406 goto error_exit;
407 }
408
409 cifsFile->invalidHandle = true;
410 cifsFile->srch_inf.endOfSearch = false;
411
412 cifs_dbg(FYI, "Full path: %s start at: %lld\n", full_path, file->f_pos);
413
414ffirst_retry:
415 /* test for Unix extensions */
416 /* but now check for them on the share/mount not on the SMB session */
417 /* if (cap_unix(tcon->ses) { */
418 if (tcon->unix_ext)
419 cifsFile->srch_inf.info_level = SMB_FIND_FILE_UNIX;
420 else if (tcon->posix_extensions)
421 cifsFile->srch_inf.info_level = SMB_FIND_FILE_POSIX_INFO;
422 else if ((tcon->ses->capabilities &
423 tcon->ses->server->vals->cap_nt_find) == 0) {
424 cifsFile->srch_inf.info_level = SMB_FIND_FILE_INFO_STANDARD;
425 } else if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM) {
426 cifsFile->srch_inf.info_level = SMB_FIND_FILE_ID_FULL_DIR_INFO;
427 } else /* not srvinos - BB fixme add check for backlevel? */ {
428 cifsFile->srch_inf.info_level = SMB_FIND_FILE_DIRECTORY_INFO;
429 }
430
431 search_flags = CIFS_SEARCH_CLOSE_AT_END | CIFS_SEARCH_RETURN_RESUME;
432 if (backup_cred(cifs_sb))
433 search_flags |= CIFS_SEARCH_BACKUP_SEARCH;
434
435 rc = server->ops->query_dir_first(xid, tcon, full_path, cifs_sb,
436 &cifsFile->fid, search_flags,
437 &cifsFile->srch_inf);
438
439 if (rc == 0)
440 cifsFile->invalidHandle = false;
441 /* BB add following call to handle readdir on new NTFS symlink errors
442 else if STATUS_STOPPED_ON_SYMLINK
443 call get_symlink_reparse_path and retry with new path */
444 else if ((rc == -EOPNOTSUPP) &&
445 (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM)) {
446 cifs_sb->mnt_cifs_flags &= ~CIFS_MOUNT_SERVER_INUM;
447 goto ffirst_retry;
448 }
449error_exit:
450 cifs_put_tlink(tlink);
451 return rc;
452}
453
454static int
455initiate_cifs_search(const unsigned int xid, struct file *file,
456 const char *full_path)
457{
458 int rc, retry_count = 0;
459
460 do {
461 rc = _initiate_cifs_search(xid, file, full_path);
462 /*
463 * If we don't have enough credits to start reading the
464 * directory just try again after short wait.
465 */
466 if (rc != -EDEADLK)
467 break;
468
469 usleep_range(512, 2048);
470 } while (retry_count++ < 5);
471
472 return rc;
473}
474
475/* return length of unicode string in bytes */
476static int cifs_unicode_bytelen(const char *str)
477{
478 int len;
479 const __le16 *ustr = (const __le16 *)str;
480
481 for (len = 0; len <= PATH_MAX; len++) {
482 if (ustr[len] == 0)
483 return len << 1;
484 }
485 cifs_dbg(FYI, "Unicode string longer than PATH_MAX found\n");
486 return len << 1;
487}
488
489static char *nxt_dir_entry(char *old_entry, char *end_of_smb, int level)
490{
491 char *new_entry;
492 FILE_DIRECTORY_INFO *pDirInfo = (FILE_DIRECTORY_INFO *)old_entry;
493
494 if (level == SMB_FIND_FILE_INFO_STANDARD) {
495 FIND_FILE_STANDARD_INFO *pfData;
496 pfData = (FIND_FILE_STANDARD_INFO *)pDirInfo;
497
498 new_entry = old_entry + sizeof(FIND_FILE_STANDARD_INFO) +
499 pfData->FileNameLength;
500 } else {
501 u32 next_offset = le32_to_cpu(pDirInfo->NextEntryOffset);
502
503 if (old_entry + next_offset < old_entry) {
504 cifs_dbg(VFS, "Invalid offset %u\n", next_offset);
505 return NULL;
506 }
507 new_entry = old_entry + next_offset;
508 }
509 cifs_dbg(FYI, "new entry %p old entry %p\n", new_entry, old_entry);
510 /* validate that new_entry is not past end of SMB */
511 if (new_entry >= end_of_smb) {
512 cifs_dbg(VFS, "search entry %p began after end of SMB %p old entry %p\n",
513 new_entry, end_of_smb, old_entry);
514 return NULL;
515 } else if (((level == SMB_FIND_FILE_INFO_STANDARD) &&
516 (new_entry + sizeof(FIND_FILE_STANDARD_INFO) > end_of_smb))
517 || ((level != SMB_FIND_FILE_INFO_STANDARD) &&
518 (new_entry + sizeof(FILE_DIRECTORY_INFO) > end_of_smb))) {
519 cifs_dbg(VFS, "search entry %p extends after end of SMB %p\n",
520 new_entry, end_of_smb);
521 return NULL;
522 } else
523 return new_entry;
524
525}
526
527struct cifs_dirent {
528 const char *name;
529 size_t namelen;
530 u32 resume_key;
531 u64 ino;
532};
533
534static void cifs_fill_dirent_posix(struct cifs_dirent *de,
535 const struct smb2_posix_info *info)
536{
537 struct smb2_posix_info_parsed parsed;
538
539 /* payload should have already been checked at this point */
540 if (posix_info_parse(info, NULL, &parsed) < 0) {
541 cifs_dbg(VFS, "Invalid POSIX info payload\n");
542 return;
543 }
544
545 de->name = parsed.name;
546 de->namelen = parsed.name_len;
547 de->resume_key = info->Ignored;
548 de->ino = le64_to_cpu(info->Inode);
549}
550
551static void cifs_fill_dirent_unix(struct cifs_dirent *de,
552 const FILE_UNIX_INFO *info, bool is_unicode)
553{
554 de->name = &info->FileName[0];
555 if (is_unicode)
556 de->namelen = cifs_unicode_bytelen(de->name);
557 else
558 de->namelen = strnlen(de->name, PATH_MAX);
559 de->resume_key = info->ResumeKey;
560 de->ino = le64_to_cpu(info->basic.UniqueId);
561}
562
563static void cifs_fill_dirent_dir(struct cifs_dirent *de,
564 const FILE_DIRECTORY_INFO *info)
565{
566 de->name = &info->FileName[0];
567 de->namelen = le32_to_cpu(info->FileNameLength);
568 de->resume_key = info->FileIndex;
569}
570
571static void cifs_fill_dirent_full(struct cifs_dirent *de,
572 const FILE_FULL_DIRECTORY_INFO *info)
573{
574 de->name = &info->FileName[0];
575 de->namelen = le32_to_cpu(info->FileNameLength);
576 de->resume_key = info->FileIndex;
577}
578
579static void cifs_fill_dirent_search(struct cifs_dirent *de,
580 const SEARCH_ID_FULL_DIR_INFO *info)
581{
582 de->name = &info->FileName[0];
583 de->namelen = le32_to_cpu(info->FileNameLength);
584 de->resume_key = info->FileIndex;
585 de->ino = le64_to_cpu(info->UniqueId);
586}
587
588static void cifs_fill_dirent_both(struct cifs_dirent *de,
589 const FILE_BOTH_DIRECTORY_INFO *info)
590{
591 de->name = &info->FileName[0];
592 de->namelen = le32_to_cpu(info->FileNameLength);
593 de->resume_key = info->FileIndex;
594}
595
596static void cifs_fill_dirent_std(struct cifs_dirent *de,
597 const FIND_FILE_STANDARD_INFO *info)
598{
599 de->name = &info->FileName[0];
600 /* one byte length, no endianess conversion */
601 de->namelen = info->FileNameLength;
602 de->resume_key = info->ResumeKey;
603}
604
605static int cifs_fill_dirent(struct cifs_dirent *de, const void *info,
606 u16 level, bool is_unicode)
607{
608 memset(de, 0, sizeof(*de));
609
610 switch (level) {
611 case SMB_FIND_FILE_POSIX_INFO:
612 cifs_fill_dirent_posix(de, info);
613 break;
614 case SMB_FIND_FILE_UNIX:
615 cifs_fill_dirent_unix(de, info, is_unicode);
616 break;
617 case SMB_FIND_FILE_DIRECTORY_INFO:
618 cifs_fill_dirent_dir(de, info);
619 break;
620 case SMB_FIND_FILE_FULL_DIRECTORY_INFO:
621 cifs_fill_dirent_full(de, info);
622 break;
623 case SMB_FIND_FILE_ID_FULL_DIR_INFO:
624 cifs_fill_dirent_search(de, info);
625 break;
626 case SMB_FIND_FILE_BOTH_DIRECTORY_INFO:
627 cifs_fill_dirent_both(de, info);
628 break;
629 case SMB_FIND_FILE_INFO_STANDARD:
630 cifs_fill_dirent_std(de, info);
631 break;
632 default:
633 cifs_dbg(FYI, "Unknown findfirst level %d\n", level);
634 return -EINVAL;
635 }
636
637 return 0;
638}
639
640#define UNICODE_DOT cpu_to_le16(0x2e)
641
642/* return 0 if no match and 1 for . (current directory) and 2 for .. (parent) */
643static int cifs_entry_is_dot(struct cifs_dirent *de, bool is_unicode)
644{
645 int rc = 0;
646
647 if (!de->name)
648 return 0;
649
650 if (is_unicode) {
651 __le16 *ufilename = (__le16 *)de->name;
652 if (de->namelen == 2) {
653 /* check for . */
654 if (ufilename[0] == UNICODE_DOT)
655 rc = 1;
656 } else if (de->namelen == 4) {
657 /* check for .. */
658 if (ufilename[0] == UNICODE_DOT &&
659 ufilename[1] == UNICODE_DOT)
660 rc = 2;
661 }
662 } else /* ASCII */ {
663 if (de->namelen == 1) {
664 if (de->name[0] == '.')
665 rc = 1;
666 } else if (de->namelen == 2) {
667 if (de->name[0] == '.' && de->name[1] == '.')
668 rc = 2;
669 }
670 }
671
672 return rc;
673}
674
675/* Check if directory that we are searching has changed so we can decide
676 whether we can use the cached search results from the previous search */
677static int is_dir_changed(struct file *file)
678{
679 struct inode *inode = file_inode(file);
680 struct cifsInodeInfo *cifsInfo = CIFS_I(inode);
681
682 if (cifsInfo->time == 0)
683 return 1; /* directory was changed, perhaps due to unlink */
684 else
685 return 0;
686
687}
688
689static int cifs_save_resume_key(const char *current_entry,
690 struct cifsFileInfo *file_info)
691{
692 struct cifs_dirent de;
693 int rc;
694
695 rc = cifs_fill_dirent(&de, current_entry, file_info->srch_inf.info_level,
696 file_info->srch_inf.unicode);
697 if (!rc) {
698 file_info->srch_inf.presume_name = de.name;
699 file_info->srch_inf.resume_name_len = de.namelen;
700 file_info->srch_inf.resume_key = de.resume_key;
701 }
702 return rc;
703}
704
705/*
706 * Find the corresponding entry in the search. Note that the SMB server returns
707 * search entries for . and .. which complicates logic here if we choose to
708 * parse for them and we do not assume that they are located in the findfirst
709 * return buffer. We start counting in the buffer with entry 2 and increment for
710 * every entry (do not increment for . or .. entry).
711 */
712static int
713find_cifs_entry(const unsigned int xid, struct cifs_tcon *tcon, loff_t pos,
714 struct file *file, const char *full_path,
715 char **current_entry, int *num_to_ret)
716{
717 __u16 search_flags;
718 int rc = 0;
719 int pos_in_buf = 0;
720 loff_t first_entry_in_buffer;
721 loff_t index_to_find = pos;
722 struct cifsFileInfo *cfile = file->private_data;
723 struct cifs_sb_info *cifs_sb = CIFS_FILE_SB(file);
724 struct TCP_Server_Info *server = tcon->ses->server;
725 /* check if index in the buffer */
726
727 if (!server->ops->query_dir_first || !server->ops->query_dir_next)
728 return -ENOSYS;
729
730 if ((cfile == NULL) || (current_entry == NULL) || (num_to_ret == NULL))
731 return -ENOENT;
732
733 *current_entry = NULL;
734 first_entry_in_buffer = cfile->srch_inf.index_of_last_entry -
735 cfile->srch_inf.entries_in_buffer;
736
737 /*
738 * If first entry in buf is zero then is first buffer
739 * in search response data which means it is likely . and ..
740 * will be in this buffer, although some servers do not return
741 * . and .. for the root of a drive and for those we need
742 * to start two entries earlier.
743 */
744
745 dump_cifs_file_struct(file, "In fce ");
746 if (((index_to_find < cfile->srch_inf.index_of_last_entry) &&
747 is_dir_changed(file)) || (index_to_find < first_entry_in_buffer)) {
748 /* close and restart search */
749 cifs_dbg(FYI, "search backing up - close and restart search\n");
750 spin_lock(&cfile->file_info_lock);
751 if (server->ops->dir_needs_close(cfile)) {
752 cfile->invalidHandle = true;
753 spin_unlock(&cfile->file_info_lock);
754 if (server->ops->close_dir)
755 server->ops->close_dir(xid, tcon, &cfile->fid);
756 } else
757 spin_unlock(&cfile->file_info_lock);
758 if (cfile->srch_inf.ntwrk_buf_start) {
759 cifs_dbg(FYI, "freeing SMB ff cache buf on search rewind\n");
760 if (cfile->srch_inf.smallBuf)
761 cifs_small_buf_release(cfile->srch_inf.
762 ntwrk_buf_start);
763 else
764 cifs_buf_release(cfile->srch_inf.
765 ntwrk_buf_start);
766 cfile->srch_inf.ntwrk_buf_start = NULL;
767 }
768 rc = initiate_cifs_search(xid, file, full_path);
769 if (rc) {
770 cifs_dbg(FYI, "error %d reinitiating a search on rewind\n",
771 rc);
772 return rc;
773 }
774 /* FindFirst/Next set last_entry to NULL on malformed reply */
775 if (cfile->srch_inf.last_entry)
776 cifs_save_resume_key(cfile->srch_inf.last_entry, cfile);
777 }
778
779 search_flags = CIFS_SEARCH_CLOSE_AT_END | CIFS_SEARCH_RETURN_RESUME;
780 if (backup_cred(cifs_sb))
781 search_flags |= CIFS_SEARCH_BACKUP_SEARCH;
782
783 while ((index_to_find >= cfile->srch_inf.index_of_last_entry) &&
784 (rc == 0) && !cfile->srch_inf.endOfSearch) {
785 cifs_dbg(FYI, "calling findnext2\n");
786 rc = server->ops->query_dir_next(xid, tcon, &cfile->fid,
787 search_flags,
788 &cfile->srch_inf);
789 /* FindFirst/Next set last_entry to NULL on malformed reply */
790 if (cfile->srch_inf.last_entry)
791 cifs_save_resume_key(cfile->srch_inf.last_entry, cfile);
792 if (rc)
793 return -ENOENT;
794 }
795 if (index_to_find < cfile->srch_inf.index_of_last_entry) {
796 /* we found the buffer that contains the entry */
797 /* scan and find it */
798 int i;
799 char *cur_ent;
800 char *end_of_smb;
801
802 if (cfile->srch_inf.ntwrk_buf_start == NULL) {
803 cifs_dbg(VFS, "ntwrk_buf_start is NULL during readdir\n");
804 return -EIO;
805 }
806
807 end_of_smb = cfile->srch_inf.ntwrk_buf_start +
808 server->ops->calc_smb_size(
809 cfile->srch_inf.ntwrk_buf_start);
810
811 cur_ent = cfile->srch_inf.srch_entries_start;
812 first_entry_in_buffer = cfile->srch_inf.index_of_last_entry
813 - cfile->srch_inf.entries_in_buffer;
814 pos_in_buf = index_to_find - first_entry_in_buffer;
815 cifs_dbg(FYI, "found entry - pos_in_buf %d\n", pos_in_buf);
816
817 for (i = 0; (i < (pos_in_buf)) && (cur_ent != NULL); i++) {
818 /* go entry by entry figuring out which is first */
819 cur_ent = nxt_dir_entry(cur_ent, end_of_smb,
820 cfile->srch_inf.info_level);
821 }
822 if ((cur_ent == NULL) && (i < pos_in_buf)) {
823 /* BB fixme - check if we should flag this error */
824 cifs_dbg(VFS, "reached end of buf searching for pos in buf %d index to find %lld rc %d\n",
825 pos_in_buf, index_to_find, rc);
826 }
827 rc = 0;
828 *current_entry = cur_ent;
829 } else {
830 cifs_dbg(FYI, "index not in buffer - could not findnext into it\n");
831 return 0;
832 }
833
834 if (pos_in_buf >= cfile->srch_inf.entries_in_buffer) {
835 cifs_dbg(FYI, "can not return entries pos_in_buf beyond last\n");
836 *num_to_ret = 0;
837 } else
838 *num_to_ret = cfile->srch_inf.entries_in_buffer - pos_in_buf;
839
840 return rc;
841}
842
843static bool emit_cached_dirents(struct cached_dirents *cde,
844 struct dir_context *ctx)
845{
846 struct cached_dirent *dirent;
847 bool rc;
848
849 list_for_each_entry(dirent, &cde->entries, entry) {
850 /*
851 * Skip all early entries prior to the current lseek()
852 * position.
853 */
854 if (ctx->pos > dirent->pos)
855 continue;
856 /*
857 * We recorded the current ->pos value for the dirent
858 * when we stored it in the cache.
859 * However, this sequence of ->pos values may have holes
860 * in it, for example dot-dirs returned from the server
861 * are suppressed.
862 * Handle this bu forcing ctx->pos to be the same as the
863 * ->pos of the current dirent we emit from the cache.
864 * This means that when we emit these entries from the cache
865 * we now emit them with the same ->pos value as in the
866 * initial scan.
867 */
868 ctx->pos = dirent->pos;
869 rc = dir_emit(ctx, dirent->name, dirent->namelen,
870 dirent->fattr.cf_uniqueid,
871 dirent->fattr.cf_dtype);
872 if (!rc)
873 return rc;
874 ctx->pos++;
875 }
876 return true;
877}
878
879static void update_cached_dirents_count(struct cached_dirents *cde,
880 struct dir_context *ctx)
881{
882 if (cde->ctx != ctx)
883 return;
884 if (cde->is_valid || cde->is_failed)
885 return;
886
887 cde->pos++;
888}
889
890static void finished_cached_dirents_count(struct cached_dirents *cde,
891 struct dir_context *ctx)
892{
893 if (cde->ctx != ctx)
894 return;
895 if (cde->is_valid || cde->is_failed)
896 return;
897 if (ctx->pos != cde->pos)
898 return;
899
900 cde->is_valid = 1;
901}
902
903static void add_cached_dirent(struct cached_dirents *cde,
904 struct dir_context *ctx,
905 const char *name, int namelen,
906 struct cifs_fattr *fattr)
907{
908 struct cached_dirent *de;
909
910 if (cde->ctx != ctx)
911 return;
912 if (cde->is_valid || cde->is_failed)
913 return;
914 if (ctx->pos != cde->pos) {
915 cde->is_failed = 1;
916 return;
917 }
918 de = kzalloc(sizeof(*de), GFP_ATOMIC);
919 if (de == NULL) {
920 cde->is_failed = 1;
921 return;
922 }
923 de->namelen = namelen;
924 de->name = kstrndup(name, namelen, GFP_ATOMIC);
925 if (de->name == NULL) {
926 kfree(de);
927 cde->is_failed = 1;
928 return;
929 }
930 de->pos = ctx->pos;
931
932 memcpy(&de->fattr, fattr, sizeof(struct cifs_fattr));
933
934 list_add_tail(&de->entry, &cde->entries);
935}
936
937static bool cifs_dir_emit(struct dir_context *ctx,
938 const char *name, int namelen,
939 struct cifs_fattr *fattr,
940 struct cached_fid *cfid)
941{
942 bool rc;
943 ino_t ino = cifs_uniqueid_to_ino_t(fattr->cf_uniqueid);
944
945 rc = dir_emit(ctx, name, namelen, ino, fattr->cf_dtype);
946 if (!rc)
947 return rc;
948
949 if (cfid) {
950 mutex_lock(&cfid->dirents.de_mutex);
951 add_cached_dirent(&cfid->dirents, ctx, name, namelen,
952 fattr);
953 mutex_unlock(&cfid->dirents.de_mutex);
954 }
955
956 return rc;
957}
958
959static int cifs_filldir(char *find_entry, struct file *file,
960 struct dir_context *ctx,
961 char *scratch_buf, unsigned int max_len,
962 struct cached_fid *cfid)
963{
964 struct cifsFileInfo *file_info = file->private_data;
965 struct super_block *sb = file_inode(file)->i_sb;
966 struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
967 struct cifs_dirent de = { NULL, };
968 struct cifs_fattr fattr;
969 struct qstr name;
970 int rc = 0;
971
972 rc = cifs_fill_dirent(&de, find_entry, file_info->srch_inf.info_level,
973 file_info->srch_inf.unicode);
974 if (rc)
975 return rc;
976
977 if (de.namelen > max_len) {
978 cifs_dbg(VFS, "bad search response length %zd past smb end\n",
979 de.namelen);
980 return -EINVAL;
981 }
982
983 /* skip . and .. since we added them first */
984 if (cifs_entry_is_dot(&de, file_info->srch_inf.unicode))
985 return 0;
986
987 if (file_info->srch_inf.unicode) {
988 struct nls_table *nlt = cifs_sb->local_nls;
989 int map_type;
990
991 map_type = cifs_remap(cifs_sb);
992 name.name = scratch_buf;
993 name.len =
994 cifs_from_utf16((char *)name.name, (__le16 *)de.name,
995 UNICODE_NAME_MAX,
996 min_t(size_t, de.namelen,
997 (size_t)max_len), nlt, map_type);
998 name.len -= nls_nullsize(nlt);
999 } else {
1000 name.name = de.name;
1001 name.len = de.namelen;
1002 }
1003
1004 switch (file_info->srch_inf.info_level) {
1005 case SMB_FIND_FILE_POSIX_INFO:
1006 cifs_posix_to_fattr(&fattr,
1007 (struct smb2_posix_info *)find_entry,
1008 cifs_sb);
1009 break;
1010 case SMB_FIND_FILE_UNIX:
1011 cifs_unix_basic_to_fattr(&fattr,
1012 &((FILE_UNIX_INFO *)find_entry)->basic,
1013 cifs_sb);
1014 if (S_ISLNK(fattr.cf_mode))
1015 fattr.cf_flags |= CIFS_FATTR_NEED_REVAL;
1016 break;
1017 case SMB_FIND_FILE_INFO_STANDARD:
1018 cifs_std_info_to_fattr(&fattr,
1019 (FIND_FILE_STANDARD_INFO *)find_entry,
1020 cifs_sb);
1021 break;
1022 case SMB_FIND_FILE_ID_FULL_DIR_INFO:
1023 cifs_fulldir_info_to_fattr(&fattr,
1024 (SEARCH_ID_FULL_DIR_INFO *)find_entry,
1025 cifs_sb);
1026 break;
1027 default:
1028 cifs_dir_info_to_fattr(&fattr,
1029 (FILE_DIRECTORY_INFO *)find_entry,
1030 cifs_sb);
1031 break;
1032 }
1033
1034 if (de.ino && (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM)) {
1035 fattr.cf_uniqueid = de.ino;
1036 } else {
1037 fattr.cf_uniqueid = iunique(sb, ROOT_I);
1038 cifs_autodisable_serverino(cifs_sb);
1039 }
1040
1041 if ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MF_SYMLINKS) &&
1042 couldbe_mf_symlink(&fattr))
1043 /*
1044 * trying to get the type and mode can be slow,
1045 * so just call those regular files for now, and mark
1046 * for reval
1047 */
1048 fattr.cf_flags |= CIFS_FATTR_NEED_REVAL;
1049
1050 cifs_prime_dcache(file_dentry(file), &name, &fattr);
1051
1052 return !cifs_dir_emit(ctx, name.name, name.len,
1053 &fattr, cfid);
1054}
1055
1056
1057int cifs_readdir(struct file *file, struct dir_context *ctx)
1058{
1059 int rc = 0;
1060 unsigned int xid;
1061 int i;
1062 struct tcon_link *tlink = NULL;
1063 struct cifs_tcon *tcon;
1064 struct cifsFileInfo *cifsFile;
1065 char *current_entry;
1066 int num_to_fill = 0;
1067 char *tmp_buf = NULL;
1068 char *end_of_smb;
1069 unsigned int max_len;
1070 const char *full_path;
1071 void *page = alloc_dentry_path();
1072 struct cached_fid *cfid = NULL;
1073 struct cifs_sb_info *cifs_sb = CIFS_FILE_SB(file);
1074
1075 xid = get_xid();
1076
1077 full_path = build_path_from_dentry(file_dentry(file), page);
1078 if (IS_ERR(full_path)) {
1079 rc = PTR_ERR(full_path);
1080 goto rddir2_exit;
1081 }
1082
1083 if (file->private_data == NULL) {
1084 tlink = cifs_sb_tlink(cifs_sb);
1085 if (IS_ERR(tlink))
1086 goto cache_not_found;
1087 tcon = tlink_tcon(tlink);
1088 } else {
1089 cifsFile = file->private_data;
1090 tcon = tlink_tcon(cifsFile->tlink);
1091 }
1092
1093 rc = open_cached_dir(xid, tcon, full_path, cifs_sb, false, &cfid);
1094 cifs_put_tlink(tlink);
1095 if (rc)
1096 goto cache_not_found;
1097
1098 mutex_lock(&cfid->dirents.de_mutex);
1099 /*
1100 * If this was reading from the start of the directory
1101 * we need to initialize scanning and storing the
1102 * directory content.
1103 */
1104 if (ctx->pos == 0 && cfid->dirents.ctx == NULL) {
1105 cfid->dirents.ctx = ctx;
1106 cfid->dirents.pos = 2;
1107 }
1108 /*
1109 * If we already have the entire directory cached then
1110 * we can just serve the cache.
1111 */
1112 if (cfid->dirents.is_valid) {
1113 if (!dir_emit_dots(file, ctx)) {
1114 mutex_unlock(&cfid->dirents.de_mutex);
1115 goto rddir2_exit;
1116 }
1117 emit_cached_dirents(&cfid->dirents, ctx);
1118 mutex_unlock(&cfid->dirents.de_mutex);
1119 goto rddir2_exit;
1120 }
1121 mutex_unlock(&cfid->dirents.de_mutex);
1122
1123 /* Drop the cache while calling initiate_cifs_search and
1124 * find_cifs_entry in case there will be reconnects during
1125 * query_directory.
1126 */
1127 close_cached_dir(cfid);
1128 cfid = NULL;
1129
1130 cache_not_found:
1131 /*
1132 * Ensure FindFirst doesn't fail before doing filldir() for '.' and
1133 * '..'. Otherwise we won't be able to notify VFS in case of failure.
1134 */
1135 if (file->private_data == NULL) {
1136 rc = initiate_cifs_search(xid, file, full_path);
1137 cifs_dbg(FYI, "initiate cifs search rc %d\n", rc);
1138 if (rc)
1139 goto rddir2_exit;
1140 }
1141
1142 if (!dir_emit_dots(file, ctx))
1143 goto rddir2_exit;
1144
1145 /* 1) If search is active,
1146 is in current search buffer?
1147 if it before then restart search
1148 if after then keep searching till find it */
1149 cifsFile = file->private_data;
1150 if (cifsFile->srch_inf.endOfSearch) {
1151 if (cifsFile->srch_inf.emptyDir) {
1152 cifs_dbg(FYI, "End of search, empty dir\n");
1153 rc = 0;
1154 goto rddir2_exit;
1155 }
1156 } /* else {
1157 cifsFile->invalidHandle = true;
1158 tcon->ses->server->close(xid, tcon, &cifsFile->fid);
1159 } */
1160
1161 tcon = tlink_tcon(cifsFile->tlink);
1162 rc = find_cifs_entry(xid, tcon, ctx->pos, file, full_path,
1163 ¤t_entry, &num_to_fill);
1164 open_cached_dir(xid, tcon, full_path, cifs_sb, false, &cfid);
1165 if (rc) {
1166 cifs_dbg(FYI, "fce error %d\n", rc);
1167 goto rddir2_exit;
1168 } else if (current_entry != NULL) {
1169 cifs_dbg(FYI, "entry %lld found\n", ctx->pos);
1170 } else {
1171 if (cfid) {
1172 mutex_lock(&cfid->dirents.de_mutex);
1173 finished_cached_dirents_count(&cfid->dirents, ctx);
1174 mutex_unlock(&cfid->dirents.de_mutex);
1175 }
1176 cifs_dbg(FYI, "Could not find entry\n");
1177 goto rddir2_exit;
1178 }
1179 cifs_dbg(FYI, "loop through %d times filling dir for net buf %p\n",
1180 num_to_fill, cifsFile->srch_inf.ntwrk_buf_start);
1181 max_len = tcon->ses->server->ops->calc_smb_size(
1182 cifsFile->srch_inf.ntwrk_buf_start);
1183 end_of_smb = cifsFile->srch_inf.ntwrk_buf_start + max_len;
1184
1185 tmp_buf = kmalloc(UNICODE_NAME_MAX, GFP_KERNEL);
1186 if (tmp_buf == NULL) {
1187 rc = -ENOMEM;
1188 goto rddir2_exit;
1189 }
1190
1191 for (i = 0; i < num_to_fill; i++) {
1192 if (current_entry == NULL) {
1193 /* evaluate whether this case is an error */
1194 cifs_dbg(VFS, "past SMB end, num to fill %d i %d\n",
1195 num_to_fill, i);
1196 break;
1197 }
1198 /*
1199 * if buggy server returns . and .. late do we want to
1200 * check for that here?
1201 */
1202 *tmp_buf = 0;
1203 rc = cifs_filldir(current_entry, file, ctx,
1204 tmp_buf, max_len, cfid);
1205 if (rc) {
1206 if (rc > 0)
1207 rc = 0;
1208 break;
1209 }
1210
1211 ctx->pos++;
1212 if (cfid) {
1213 mutex_lock(&cfid->dirents.de_mutex);
1214 update_cached_dirents_count(&cfid->dirents, ctx);
1215 mutex_unlock(&cfid->dirents.de_mutex);
1216 }
1217
1218 if (ctx->pos ==
1219 cifsFile->srch_inf.index_of_last_entry) {
1220 cifs_dbg(FYI, "last entry in buf at pos %lld %s\n",
1221 ctx->pos, tmp_buf);
1222 cifs_save_resume_key(current_entry, cifsFile);
1223 break;
1224 }
1225 current_entry =
1226 nxt_dir_entry(current_entry, end_of_smb,
1227 cifsFile->srch_inf.info_level);
1228 }
1229 kfree(tmp_buf);
1230
1231rddir2_exit:
1232 if (cfid)
1233 close_cached_dir(cfid);
1234 free_dentry_path(page);
1235 free_xid(xid);
1236 return rc;
1237}