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io_uring: ensure finish_wait() is always called in __io_uring_task_cancel()
[linux/fpc-iii.git] / fs / cifs / readdir.c
blob80bf4c6f4c7bc7d209e95898b8ec43cb29104424
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 #include "smb2proto.h"
36 #include "fs_context.h"
37
38 /*
39 * To be safe - for UCS to UTF-8 with strings loaded with the rare long
40 * characters alloc more to account for such multibyte target UTF-8
41 * characters.
42 */
43 #define UNICODE_NAME_MAX ((4 * NAME_MAX) + 2)
44
45 #ifdef CONFIG_CIFS_DEBUG2
46 static void dump_cifs_file_struct(struct file *file, char *label)
47 {
48 struct cifsFileInfo *cf;
49
50 if (file) {
51 cf = file->private_data;
52 if (cf == NULL) {
53 cifs_dbg(FYI, "empty cifs private file data\n");
54 return;
55 }
56 if (cf->invalidHandle)
57 cifs_dbg(FYI, "Invalid handle\n");
58 if (cf->srch_inf.endOfSearch)
59 cifs_dbg(FYI, "end of search\n");
60 if (cf->srch_inf.emptyDir)
61 cifs_dbg(FYI, "empty dir\n");
62 }
63 }
64 #else
65 static inline void dump_cifs_file_struct(struct file *file, char *label)
66 {
67 }
68 #endif /* DEBUG2 */
69
70 /*
71 * Attempt to preload the dcache with the results from the FIND_FIRST/NEXT
72 *
73 * Find the dentry that matches "name". If there isn't one, create one. If it's
74 * a negative dentry or the uniqueid or filetype(mode) changed,
75 * then drop it and recreate it.
76 */
77 static void
78 cifs_prime_dcache(struct dentry *parent, struct qstr *name,
79 struct cifs_fattr *fattr)
80 {
81 struct dentry *dentry, *alias;
82 struct inode *inode;
83 struct super_block *sb = parent->d_sb;
84 struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
85 DECLARE_WAIT_QUEUE_HEAD_ONSTACK(wq);
86
87 cifs_dbg(FYI, "%s: for %s\n", __func__, name->name);
88
89 dentry = d_hash_and_lookup(parent, name);
90 if (!dentry) {
91 /*
92 * If we know that the inode will need to be revalidated
93 * immediately, then don't create a new dentry for it.
94 * We'll end up doing an on the wire call either way and
95 * this spares us an invalidation.
96 */
97 if (fattr->cf_flags & CIFS_FATTR_NEED_REVAL)
98 return;
99 retry:
100 dentry = d_alloc_parallel(parent, name, &wq);
101 }
102 if (IS_ERR(dentry))
103 return;
104 if (!d_in_lookup(dentry)) {
105 inode = d_inode(dentry);
106 if (inode) {
107 if (d_mountpoint(dentry)) {
108 dput(dentry);
109 return;
110 }
111 /*
112 * If we're generating inode numbers, then we don't
113 * want to clobber the existing one with the one that
114 * the readdir code created.
115 */
116 if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM))
117 fattr->cf_uniqueid = CIFS_I(inode)->uniqueid;
118
119 /* update inode in place
120 * if both i_ino and i_mode didn't change */
121 if (CIFS_I(inode)->uniqueid == fattr->cf_uniqueid &&
122 (inode->i_mode & S_IFMT) ==
123 (fattr->cf_mode & S_IFMT)) {
124 cifs_fattr_to_inode(inode, fattr);
125 dput(dentry);
126 return;
127 }
128 }
129 d_invalidate(dentry);
130 dput(dentry);
131 goto retry;
132 } else {
133 inode = cifs_iget(sb, fattr);
134 if (!inode)
135 inode = ERR_PTR(-ENOMEM);
136 alias = d_splice_alias(inode, dentry);
137 d_lookup_done(dentry);
138 if (alias && !IS_ERR(alias))
139 dput(alias);
140 }
141 dput(dentry);
142 }
143
144 static bool reparse_file_needs_reval(const struct cifs_fattr *fattr)
145 {
146 if (!(fattr->cf_cifsattrs & ATTR_REPARSE))
147 return false;
148 /*
149 * The DFS tags should be only intepreted by server side as per
150 * MS-FSCC 2.1.2.1, but let's include them anyway.
151 *
152 * Besides, if cf_cifstag is unset (0), then we still need it to be
153 * revalidated to know exactly what reparse point it is.
154 */
155 switch (fattr->cf_cifstag) {
156 case IO_REPARSE_TAG_DFS:
157 case IO_REPARSE_TAG_DFSR:
158 case IO_REPARSE_TAG_SYMLINK:
159 case IO_REPARSE_TAG_NFS:
160 case 0:
161 return true;
162 }
163 return false;
164 }
165
166 static void
167 cifs_fill_common_info(struct cifs_fattr *fattr, struct cifs_sb_info *cifs_sb)
168 {
169 fattr->cf_uid = cifs_sb->ctx->linux_uid;
170 fattr->cf_gid = cifs_sb->ctx->linux_gid;
171
172 /*
173 * The IO_REPARSE_TAG_LX_ tags originally were used by WSL but they
174 * are preferred by the Linux client in some cases since, unlike
175 * the NFS reparse tag (or EAs), they don't require an extra query
176 * to determine which type of special file they represent.
177 * TODO: go through all documented reparse tags to see if we can
178 * reasonably map some of them to directories vs. files vs. symlinks
179 */
180 if (fattr->cf_cifsattrs & ATTR_DIRECTORY) {
181 fattr->cf_mode = S_IFDIR | cifs_sb->ctx->dir_mode;
182 fattr->cf_dtype = DT_DIR;
183 } else if (fattr->cf_cifstag == IO_REPARSE_TAG_LX_SYMLINK) {
184 fattr->cf_mode |= S_IFLNK | cifs_sb->ctx->file_mode;
185 fattr->cf_dtype = DT_LNK;
186 } else if (fattr->cf_cifstag == IO_REPARSE_TAG_LX_FIFO) {
187 fattr->cf_mode |= S_IFIFO | cifs_sb->ctx->file_mode;
188 fattr->cf_dtype = DT_FIFO;
189 } else if (fattr->cf_cifstag == IO_REPARSE_TAG_AF_UNIX) {
190 fattr->cf_mode |= S_IFSOCK | cifs_sb->ctx->file_mode;
191 fattr->cf_dtype = DT_SOCK;
192 } else if (fattr->cf_cifstag == IO_REPARSE_TAG_LX_CHR) {
193 fattr->cf_mode |= S_IFCHR | cifs_sb->ctx->file_mode;
194 fattr->cf_dtype = DT_CHR;
195 } else if (fattr->cf_cifstag == IO_REPARSE_TAG_LX_BLK) {
196 fattr->cf_mode |= S_IFBLK | cifs_sb->ctx->file_mode;
197 fattr->cf_dtype = DT_BLK;
198 } else { /* TODO: should we mark some other reparse points (like DFSR) as directories? */
199 fattr->cf_mode = S_IFREG | cifs_sb->ctx->file_mode;
200 fattr->cf_dtype = DT_REG;
201 }
202
203 /*
204 * We need to revalidate it further to make a decision about whether it
205 * is a symbolic link, DFS referral or a reparse point with a direct
206 * access like junctions, deduplicated files, NFS symlinks.
207 */
208 if (reparse_file_needs_reval(fattr))
209 fattr->cf_flags |= CIFS_FATTR_NEED_REVAL;
210
211 /* non-unix readdir doesn't provide nlink */
212 fattr->cf_flags |= CIFS_FATTR_UNKNOWN_NLINK;
213
214 if (fattr->cf_cifsattrs & ATTR_READONLY)
215 fattr->cf_mode &= ~S_IWUGO;
216
217 /*
218 * We of course don't get ACL info in FIND_FIRST/NEXT results, so
219 * mark it for revalidation so that "ls -l" will look right. It might
220 * be super-slow, but if we don't do this then the ownership of files
221 * may look wrong since the inodes may not have timed out by the time
222 * "ls" does a stat() call on them.
223 */
224 if ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_CIFS_ACL) ||
225 (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MODE_FROM_SID))
226 fattr->cf_flags |= CIFS_FATTR_NEED_REVAL;
227
228 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_UNX_EMUL &&
229 fattr->cf_cifsattrs & ATTR_SYSTEM) {
230 if (fattr->cf_eof == 0) {
231 fattr->cf_mode &= ~S_IFMT;
232 fattr->cf_mode |= S_IFIFO;
233 fattr->cf_dtype = DT_FIFO;
234 } else {
235 /*
236 * trying to get the type and mode via SFU can be slow,
237 * so just call those regular files for now, and mark
238 * for reval
239 */
240 fattr->cf_flags |= CIFS_FATTR_NEED_REVAL;
241 }
242 }
243 }
244
245 /* Fill a cifs_fattr struct with info from SMB_FIND_FILE_POSIX_INFO. */
246 static void
247 cifs_posix_to_fattr(struct cifs_fattr *fattr, struct smb2_posix_info *info,
248 struct cifs_sb_info *cifs_sb)
249 {
250 struct smb2_posix_info_parsed parsed;
251
252 posix_info_parse(info, NULL, &parsed);
253
254 memset(fattr, 0, sizeof(*fattr));
255 fattr->cf_uniqueid = le64_to_cpu(info->Inode);
256 fattr->cf_bytes = le64_to_cpu(info->AllocationSize);
257 fattr->cf_eof = le64_to_cpu(info->EndOfFile);
258
259 fattr->cf_atime = cifs_NTtimeToUnix(info->LastAccessTime);
260 fattr->cf_mtime = cifs_NTtimeToUnix(info->LastWriteTime);
261 fattr->cf_ctime = cifs_NTtimeToUnix(info->CreationTime);
262
263 fattr->cf_nlink = le32_to_cpu(info->HardLinks);
264 fattr->cf_cifsattrs = le32_to_cpu(info->DosAttributes);
265
266 /*
267 * Since we set the inode type below we need to mask off
268 * to avoid strange results if bits set above.
269 * XXX: why not make server&client use the type bits?
270 */
271 fattr->cf_mode = le32_to_cpu(info->Mode) & ~S_IFMT;
272
273 cifs_dbg(FYI, "posix fattr: dev %d, reparse %d, mode %o\n",
274 le32_to_cpu(info->DeviceId),
275 le32_to_cpu(info->ReparseTag),
276 le32_to_cpu(info->Mode));
277
278 if (fattr->cf_cifsattrs & ATTR_DIRECTORY) {
279 fattr->cf_mode |= S_IFDIR;
280 fattr->cf_dtype = DT_DIR;
281 } else {
282 /*
283 * mark anything that is not a dir as regular
284 * file. special files should have the REPARSE
285 * attribute and will be marked as needing revaluation
286 */
287 fattr->cf_mode |= S_IFREG;
288 fattr->cf_dtype = DT_REG;
289 }
290
291 if (reparse_file_needs_reval(fattr))
292 fattr->cf_flags |= CIFS_FATTR_NEED_REVAL;
293
294 sid_to_id(cifs_sb, &parsed.owner, fattr, SIDOWNER);
295 sid_to_id(cifs_sb, &parsed.group, fattr, SIDGROUP);
296 }
297
298 static void __dir_info_to_fattr(struct cifs_fattr *fattr, const void *info)
299 {
300 const FILE_DIRECTORY_INFO *fi = info;
301
302 memset(fattr, 0, sizeof(*fattr));
303 fattr->cf_cifsattrs = le32_to_cpu(fi->ExtFileAttributes);
304 fattr->cf_eof = le64_to_cpu(fi->EndOfFile);
305 fattr->cf_bytes = le64_to_cpu(fi->AllocationSize);
306 fattr->cf_createtime = le64_to_cpu(fi->CreationTime);
307 fattr->cf_atime = cifs_NTtimeToUnix(fi->LastAccessTime);
308 fattr->cf_ctime = cifs_NTtimeToUnix(fi->ChangeTime);
309 fattr->cf_mtime = cifs_NTtimeToUnix(fi->LastWriteTime);
310 }
311
312 void
313 cifs_dir_info_to_fattr(struct cifs_fattr *fattr, FILE_DIRECTORY_INFO *info,
314 struct cifs_sb_info *cifs_sb)
315 {
316 __dir_info_to_fattr(fattr, info);
317 cifs_fill_common_info(fattr, cifs_sb);
318 }
319
320 static void cifs_fulldir_info_to_fattr(struct cifs_fattr *fattr,
321 SEARCH_ID_FULL_DIR_INFO *info,
322 struct cifs_sb_info *cifs_sb)
323 {
324 __dir_info_to_fattr(fattr, info);
325
326 /* See MS-FSCC 2.4.18 FileIdFullDirectoryInformation */
327 if (fattr->cf_cifsattrs & ATTR_REPARSE)
328 fattr->cf_cifstag = le32_to_cpu(info->EaSize);
329 cifs_fill_common_info(fattr, cifs_sb);
330 }
331
332 static void
333 cifs_std_info_to_fattr(struct cifs_fattr *fattr, FIND_FILE_STANDARD_INFO *info,
334 struct cifs_sb_info *cifs_sb)
335 {
336 int offset = cifs_sb_master_tcon(cifs_sb)->ses->server->timeAdj;
337
338 memset(fattr, 0, sizeof(*fattr));
339 fattr->cf_atime = cnvrtDosUnixTm(info->LastAccessDate,
340 info->LastAccessTime, offset);
341 fattr->cf_ctime = cnvrtDosUnixTm(info->LastWriteDate,
342 info->LastWriteTime, offset);
343 fattr->cf_mtime = cnvrtDosUnixTm(info->LastWriteDate,
344 info->LastWriteTime, offset);
345
346 fattr->cf_cifsattrs = le16_to_cpu(info->Attributes);
347 fattr->cf_bytes = le32_to_cpu(info->AllocationSize);
348 fattr->cf_eof = le32_to_cpu(info->DataSize);
349
350 cifs_fill_common_info(fattr, cifs_sb);
351 }
352
353 /* BB eventually need to add the following helper function to
354 resolve NT_STATUS_STOPPED_ON_SYMLINK return code when
355 we try to do FindFirst on (NTFS) directory symlinks */
356 /*
357 int get_symlink_reparse_path(char *full_path, struct cifs_sb_info *cifs_sb,
358 unsigned int xid)
359 {
360 __u16 fid;
361 int len;
362 int oplock = 0;
363 int rc;
364 struct cifs_tcon *ptcon = cifs_sb_tcon(cifs_sb);
365 char *tmpbuffer;
366
367 rc = CIFSSMBOpen(xid, ptcon, full_path, FILE_OPEN, GENERIC_READ,
368 OPEN_REPARSE_POINT, &fid, &oplock, NULL,
369 cifs_sb->local_nls,
370 cifs_remap(cifs_sb);
371 if (!rc) {
372 tmpbuffer = kmalloc(maxpath);
373 rc = CIFSSMBQueryReparseLinkInfo(xid, ptcon, full_path,
374 tmpbuffer,
375 maxpath -1,
376 fid,
377 cifs_sb->local_nls);
378 if (CIFSSMBClose(xid, ptcon, fid)) {
379 cifs_dbg(FYI, "Error closing temporary reparsepoint open\n");
380 }
381 }
382 }
383 */
384
385 static int
386 initiate_cifs_search(const unsigned int xid, struct file *file,
387 char *full_path)
388 {
389 __u16 search_flags;
390 int rc = 0;
391 struct cifsFileInfo *cifsFile;
392 struct cifs_sb_info *cifs_sb = CIFS_FILE_SB(file);
393 struct tcon_link *tlink = NULL;
394 struct cifs_tcon *tcon;
395 struct TCP_Server_Info *server;
396
397 if (file->private_data == NULL) {
398 tlink = cifs_sb_tlink(cifs_sb);
399 if (IS_ERR(tlink))
400 return PTR_ERR(tlink);
401
402 cifsFile = kzalloc(sizeof(struct cifsFileInfo), GFP_KERNEL);
403 if (cifsFile == NULL) {
404 rc = -ENOMEM;
405 goto error_exit;
406 }
407 spin_lock_init(&cifsFile->file_info_lock);
408 file->private_data = cifsFile;
409 cifsFile->tlink = cifs_get_tlink(tlink);
410 tcon = tlink_tcon(tlink);
411 } else {
412 cifsFile = file->private_data;
413 tcon = tlink_tcon(cifsFile->tlink);
414 }
415
416 server = tcon->ses->server;
417
418 if (!server->ops->query_dir_first) {
419 rc = -ENOSYS;
420 goto error_exit;
421 }
422
423 cifsFile->invalidHandle = true;
424 cifsFile->srch_inf.endOfSearch = false;
425
426 cifs_dbg(FYI, "Full path: %s start at: %lld\n", full_path, file->f_pos);
427
428 ffirst_retry:
429 /* test for Unix extensions */
430 /* but now check for them on the share/mount not on the SMB session */
431 /* if (cap_unix(tcon->ses) { */
432 if (tcon->unix_ext)
433 cifsFile->srch_inf.info_level = SMB_FIND_FILE_UNIX;
434 else if (tcon->posix_extensions)
435 cifsFile->srch_inf.info_level = SMB_FIND_FILE_POSIX_INFO;
436 else if ((tcon->ses->capabilities &
437 tcon->ses->server->vals->cap_nt_find) == 0) {
438 cifsFile->srch_inf.info_level = SMB_FIND_FILE_INFO_STANDARD;
439 } else if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM) {
440 cifsFile->srch_inf.info_level = SMB_FIND_FILE_ID_FULL_DIR_INFO;
441 } else /* not srvinos - BB fixme add check for backlevel? */ {
442 cifsFile->srch_inf.info_level = SMB_FIND_FILE_DIRECTORY_INFO;
443 }
444
445 search_flags = CIFS_SEARCH_CLOSE_AT_END | CIFS_SEARCH_RETURN_RESUME;
446 if (backup_cred(cifs_sb))
447 search_flags |= CIFS_SEARCH_BACKUP_SEARCH;
448
449 rc = server->ops->query_dir_first(xid, tcon, full_path, cifs_sb,
450 &cifsFile->fid, search_flags,
451 &cifsFile->srch_inf);
452
453 if (rc == 0)
454 cifsFile->invalidHandle = false;
455 /* BB add following call to handle readdir on new NTFS symlink errors
456 else if STATUS_STOPPED_ON_SYMLINK
457 call get_symlink_reparse_path and retry with new path */
458 else if ((rc == -EOPNOTSUPP) &&
459 (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM)) {
460 cifs_sb->mnt_cifs_flags &= ~CIFS_MOUNT_SERVER_INUM;
461 goto ffirst_retry;
462 }
463 error_exit:
464 cifs_put_tlink(tlink);
465 return rc;
466 }
467
468 /* return length of unicode string in bytes */
469 static int cifs_unicode_bytelen(const char *str)
470 {
471 int len;
472 const __le16 *ustr = (const __le16 *)str;
473
474 for (len = 0; len <= PATH_MAX; len++) {
475 if (ustr[len] == 0)
476 return len << 1;
477 }
478 cifs_dbg(FYI, "Unicode string longer than PATH_MAX found\n");
479 return len << 1;
480 }
481
482 static char *nxt_dir_entry(char *old_entry, char *end_of_smb, int level)
483 {
484 char *new_entry;
485 FILE_DIRECTORY_INFO *pDirInfo = (FILE_DIRECTORY_INFO *)old_entry;
486
487 if (level == SMB_FIND_FILE_INFO_STANDARD) {
488 FIND_FILE_STANDARD_INFO *pfData;
489 pfData = (FIND_FILE_STANDARD_INFO *)pDirInfo;
490
491 new_entry = old_entry + sizeof(FIND_FILE_STANDARD_INFO) +
492 pfData->FileNameLength;
493 } else {
494 u32 next_offset = le32_to_cpu(pDirInfo->NextEntryOffset);
495
496 if (old_entry + next_offset < old_entry) {
497 cifs_dbg(VFS, "Invalid offset %u\n", next_offset);
498 return NULL;
499 }
500 new_entry = old_entry + next_offset;
501 }
502 cifs_dbg(FYI, "new entry %p old entry %p\n", new_entry, old_entry);
503 /* validate that new_entry is not past end of SMB */
504 if (new_entry >= end_of_smb) {
505 cifs_dbg(VFS, "search entry %p began after end of SMB %p old entry %p\n",
506 new_entry, end_of_smb, old_entry);
507 return NULL;
508 } else if (((level == SMB_FIND_FILE_INFO_STANDARD) &&
509 (new_entry + sizeof(FIND_FILE_STANDARD_INFO) > end_of_smb))
510 || ((level != SMB_FIND_FILE_INFO_STANDARD) &&
511 (new_entry + sizeof(FILE_DIRECTORY_INFO) > end_of_smb))) {
512 cifs_dbg(VFS, "search entry %p extends after end of SMB %p\n",
513 new_entry, end_of_smb);
514 return NULL;
515 } else
516 return new_entry;
517
518 }
519
520 struct cifs_dirent {
521 const char *name;
522 size_t namelen;
523 u32 resume_key;
524 u64 ino;
525 };
526
527 static void cifs_fill_dirent_posix(struct cifs_dirent *de,
528 const struct smb2_posix_info *info)
529 {
530 struct smb2_posix_info_parsed parsed;
531
532 /* payload should have already been checked at this point */
533 if (posix_info_parse(info, NULL, &parsed) < 0) {
534 cifs_dbg(VFS, "Invalid POSIX info payload\n");
535 return;
536 }
537
538 de->name = parsed.name;
539 de->namelen = parsed.name_len;
540 de->resume_key = info->Ignored;
541 de->ino = le64_to_cpu(info->Inode);
542 }
543
544 static void cifs_fill_dirent_unix(struct cifs_dirent *de,
545 const FILE_UNIX_INFO *info, bool is_unicode)
546 {
547 de->name = &info->FileName[0];
548 if (is_unicode)
549 de->namelen = cifs_unicode_bytelen(de->name);
550 else
551 de->namelen = strnlen(de->name, PATH_MAX);
552 de->resume_key = info->ResumeKey;
553 de->ino = le64_to_cpu(info->basic.UniqueId);
554 }
555
556 static void cifs_fill_dirent_dir(struct cifs_dirent *de,
557 const FILE_DIRECTORY_INFO *info)
558 {
559 de->name = &info->FileName[0];
560 de->namelen = le32_to_cpu(info->FileNameLength);
561 de->resume_key = info->FileIndex;
562 }
563
564 static void cifs_fill_dirent_full(struct cifs_dirent *de,
565 const FILE_FULL_DIRECTORY_INFO *info)
566 {
567 de->name = &info->FileName[0];
568 de->namelen = le32_to_cpu(info->FileNameLength);
569 de->resume_key = info->FileIndex;
570 }
571
572 static void cifs_fill_dirent_search(struct cifs_dirent *de,
573 const SEARCH_ID_FULL_DIR_INFO *info)
574 {
575 de->name = &info->FileName[0];
576 de->namelen = le32_to_cpu(info->FileNameLength);
577 de->resume_key = info->FileIndex;
578 de->ino = le64_to_cpu(info->UniqueId);
579 }
580
581 static void cifs_fill_dirent_both(struct cifs_dirent *de,
582 const FILE_BOTH_DIRECTORY_INFO *info)
583 {
584 de->name = &info->FileName[0];
585 de->namelen = le32_to_cpu(info->FileNameLength);
586 de->resume_key = info->FileIndex;
587 }
588
589 static void cifs_fill_dirent_std(struct cifs_dirent *de,
590 const FIND_FILE_STANDARD_INFO *info)
591 {
592 de->name = &info->FileName[0];
593 /* one byte length, no endianess conversion */
594 de->namelen = info->FileNameLength;
595 de->resume_key = info->ResumeKey;
596 }
597
598 static int cifs_fill_dirent(struct cifs_dirent *de, const void *info,
599 u16 level, bool is_unicode)
600 {
601 memset(de, 0, sizeof(*de));
602
603 switch (level) {
604 case SMB_FIND_FILE_POSIX_INFO:
605 cifs_fill_dirent_posix(de, info);
606 break;
607 case SMB_FIND_FILE_UNIX:
608 cifs_fill_dirent_unix(de, info, is_unicode);
609 break;
610 case SMB_FIND_FILE_DIRECTORY_INFO:
611 cifs_fill_dirent_dir(de, info);
612 break;
613 case SMB_FIND_FILE_FULL_DIRECTORY_INFO:
614 cifs_fill_dirent_full(de, info);
615 break;
616 case SMB_FIND_FILE_ID_FULL_DIR_INFO:
617 cifs_fill_dirent_search(de, info);
618 break;
619 case SMB_FIND_FILE_BOTH_DIRECTORY_INFO:
620 cifs_fill_dirent_both(de, info);
621 break;
622 case SMB_FIND_FILE_INFO_STANDARD:
623 cifs_fill_dirent_std(de, info);
624 break;
625 default:
626 cifs_dbg(FYI, "Unknown findfirst level %d\n", level);
627 return -EINVAL;
628 }
629
630 return 0;
631 }
632
633 #define UNICODE_DOT cpu_to_le16(0x2e)
634
635 /* return 0 if no match and 1 for . (current directory) and 2 for .. (parent) */
636 static int cifs_entry_is_dot(struct cifs_dirent *de, bool is_unicode)
637 {
638 int rc = 0;
639
640 if (!de->name)
641 return 0;
642
643 if (is_unicode) {
644 __le16 *ufilename = (__le16 *)de->name;
645 if (de->namelen == 2) {
646 /* check for . */
647 if (ufilename[0] == UNICODE_DOT)
648 rc = 1;
649 } else if (de->namelen == 4) {
650 /* check for .. */
651 if (ufilename[0] == UNICODE_DOT &&
652 ufilename[1] == UNICODE_DOT)
653 rc = 2;
654 }
655 } else /* ASCII */ {
656 if (de->namelen == 1) {
657 if (de->name[0] == '.')
658 rc = 1;
659 } else if (de->namelen == 2) {
660 if (de->name[0] == '.' && de->name[1] == '.')
661 rc = 2;
662 }
663 }
664
665 return rc;
666 }
667
668 /* Check if directory that we are searching has changed so we can decide
669 whether we can use the cached search results from the previous search */
670 static int is_dir_changed(struct file *file)
671 {
672 struct inode *inode = file_inode(file);
673 struct cifsInodeInfo *cifsInfo = CIFS_I(inode);
674
675 if (cifsInfo->time == 0)
676 return 1; /* directory was changed, perhaps due to unlink */
677 else
678 return 0;
679
680 }
681
682 static int cifs_save_resume_key(const char *current_entry,
683 struct cifsFileInfo *file_info)
684 {
685 struct cifs_dirent de;
686 int rc;
687
688 rc = cifs_fill_dirent(&de, current_entry, file_info->srch_inf.info_level,
689 file_info->srch_inf.unicode);
690 if (!rc) {
691 file_info->srch_inf.presume_name = de.name;
692 file_info->srch_inf.resume_name_len = de.namelen;
693 file_info->srch_inf.resume_key = de.resume_key;
694 }
695 return rc;
696 }
697
698 /*
699 * Find the corresponding entry in the search. Note that the SMB server returns
700 * search entries for . and .. which complicates logic here if we choose to
701 * parse for them and we do not assume that they are located in the findfirst
702 * return buffer. We start counting in the buffer with entry 2 and increment for
703 * every entry (do not increment for . or .. entry).
704 */
705 static int
706 find_cifs_entry(const unsigned int xid, struct cifs_tcon *tcon, loff_t pos,
707 struct file *file, char *full_path,
708 char **current_entry, int *num_to_ret)
709 {
710 __u16 search_flags;
711 int rc = 0;
712 int pos_in_buf = 0;
713 loff_t first_entry_in_buffer;
714 loff_t index_to_find = pos;
715 struct cifsFileInfo *cfile = file->private_data;
716 struct cifs_sb_info *cifs_sb = CIFS_FILE_SB(file);
717 struct TCP_Server_Info *server = tcon->ses->server;
718 /* check if index in the buffer */
719
720 if (!server->ops->query_dir_first || !server->ops->query_dir_next)
721 return -ENOSYS;
722
723 if ((cfile == NULL) || (current_entry == NULL) || (num_to_ret == NULL))
724 return -ENOENT;
725
726 *current_entry = NULL;
727 first_entry_in_buffer = cfile->srch_inf.index_of_last_entry -
728 cfile->srch_inf.entries_in_buffer;
729
730 /*
731 * If first entry in buf is zero then is first buffer
732 * in search response data which means it is likely . and ..
733 * will be in this buffer, although some servers do not return
734 * . and .. for the root of a drive and for those we need
735 * to start two entries earlier.
736 */
737
738 dump_cifs_file_struct(file, "In fce ");
739 if (((index_to_find < cfile->srch_inf.index_of_last_entry) &&
740 is_dir_changed(file)) || (index_to_find < first_entry_in_buffer)) {
741 /* close and restart search */
742 cifs_dbg(FYI, "search backing up - close and restart search\n");
743 spin_lock(&cfile->file_info_lock);
744 if (server->ops->dir_needs_close(cfile)) {
745 cfile->invalidHandle = true;
746 spin_unlock(&cfile->file_info_lock);
747 if (server->ops->close_dir)
748 server->ops->close_dir(xid, tcon, &cfile->fid);
749 } else
750 spin_unlock(&cfile->file_info_lock);
751 if (cfile->srch_inf.ntwrk_buf_start) {
752 cifs_dbg(FYI, "freeing SMB ff cache buf on search rewind\n");
753 if (cfile->srch_inf.smallBuf)
754 cifs_small_buf_release(cfile->srch_inf.
755 ntwrk_buf_start);
756 else
757 cifs_buf_release(cfile->srch_inf.
758 ntwrk_buf_start);
759 cfile->srch_inf.ntwrk_buf_start = NULL;
760 }
761 rc = initiate_cifs_search(xid, file, full_path);
762 if (rc) {
763 cifs_dbg(FYI, "error %d reinitiating a search on rewind\n",
764 rc);
765 return rc;
766 }
767 /* FindFirst/Next set last_entry to NULL on malformed reply */
768 if (cfile->srch_inf.last_entry)
769 cifs_save_resume_key(cfile->srch_inf.last_entry, cfile);
770 }
771
772 search_flags = CIFS_SEARCH_CLOSE_AT_END | CIFS_SEARCH_RETURN_RESUME;
773 if (backup_cred(cifs_sb))
774 search_flags |= CIFS_SEARCH_BACKUP_SEARCH;
775
776 while ((index_to_find >= cfile->srch_inf.index_of_last_entry) &&
777 (rc == 0) && !cfile->srch_inf.endOfSearch) {
778 cifs_dbg(FYI, "calling findnext2\n");
779 rc = server->ops->query_dir_next(xid, tcon, &cfile->fid,
780 search_flags,
781 &cfile->srch_inf);
782 /* FindFirst/Next set last_entry to NULL on malformed reply */
783 if (cfile->srch_inf.last_entry)
784 cifs_save_resume_key(cfile->srch_inf.last_entry, cfile);
785 if (rc)
786 return -ENOENT;
787 }
788 if (index_to_find < cfile->srch_inf.index_of_last_entry) {
789 /* we found the buffer that contains the entry */
790 /* scan and find it */
791 int i;
792 char *cur_ent;
793 char *end_of_smb;
794
795 if (cfile->srch_inf.ntwrk_buf_start == NULL) {
796 cifs_dbg(VFS, "ntwrk_buf_start is NULL during readdir\n");
797 return -EIO;
798 }
799
800 end_of_smb = cfile->srch_inf.ntwrk_buf_start +
801 server->ops->calc_smb_size(
802 cfile->srch_inf.ntwrk_buf_start,
803 server);
804
805 cur_ent = cfile->srch_inf.srch_entries_start;
806 first_entry_in_buffer = cfile->srch_inf.index_of_last_entry
807 - cfile->srch_inf.entries_in_buffer;
808 pos_in_buf = index_to_find - first_entry_in_buffer;
809 cifs_dbg(FYI, "found entry - pos_in_buf %d\n", pos_in_buf);
810
811 for (i = 0; (i < (pos_in_buf)) && (cur_ent != NULL); i++) {
812 /* go entry by entry figuring out which is first */
813 cur_ent = nxt_dir_entry(cur_ent, end_of_smb,
814 cfile->srch_inf.info_level);
815 }
816 if ((cur_ent == NULL) && (i < pos_in_buf)) {
817 /* BB fixme - check if we should flag this error */
818 cifs_dbg(VFS, "reached end of buf searching for pos in buf %d index to find %lld rc %d\n",
819 pos_in_buf, index_to_find, rc);
820 }
821 rc = 0;
822 *current_entry = cur_ent;
823 } else {
824 cifs_dbg(FYI, "index not in buffer - could not findnext into it\n");
825 return 0;
826 }
827
828 if (pos_in_buf >= cfile->srch_inf.entries_in_buffer) {
829 cifs_dbg(FYI, "can not return entries pos_in_buf beyond last\n");
830 *num_to_ret = 0;
831 } else
832 *num_to_ret = cfile->srch_inf.entries_in_buffer - pos_in_buf;
833
834 return rc;
835 }
836
837 static int cifs_filldir(char *find_entry, struct file *file,
838 struct dir_context *ctx,
839 char *scratch_buf, unsigned int max_len)
840 {
841 struct cifsFileInfo *file_info = file->private_data;
842 struct super_block *sb = file_inode(file)->i_sb;
843 struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
844 struct cifs_dirent de = { NULL, };
845 struct cifs_fattr fattr;
846 struct qstr name;
847 int rc = 0;
848 ino_t ino;
849
850 rc = cifs_fill_dirent(&de, find_entry, file_info->srch_inf.info_level,
851 file_info->srch_inf.unicode);
852 if (rc)
853 return rc;
854
855 if (de.namelen > max_len) {
856 cifs_dbg(VFS, "bad search response length %zd past smb end\n",
857 de.namelen);
858 return -EINVAL;
859 }
860
861 /* skip . and .. since we added them first */
862 if (cifs_entry_is_dot(&de, file_info->srch_inf.unicode))
863 return 0;
864
865 if (file_info->srch_inf.unicode) {
866 struct nls_table *nlt = cifs_sb->local_nls;
867 int map_type;
868
869 map_type = cifs_remap(cifs_sb);
870 name.name = scratch_buf;
871 name.len =
872 cifs_from_utf16((char *)name.name, (__le16 *)de.name,
873 UNICODE_NAME_MAX,
874 min_t(size_t, de.namelen,
875 (size_t)max_len), nlt, map_type);
876 name.len -= nls_nullsize(nlt);
877 } else {
878 name.name = de.name;
879 name.len = de.namelen;
880 }
881
882 switch (file_info->srch_inf.info_level) {
883 case SMB_FIND_FILE_POSIX_INFO:
884 cifs_posix_to_fattr(&fattr,
885 (struct smb2_posix_info *)find_entry,
886 cifs_sb);
887 break;
888 case SMB_FIND_FILE_UNIX:
889 cifs_unix_basic_to_fattr(&fattr,
890 &((FILE_UNIX_INFO *)find_entry)->basic,
891 cifs_sb);
892 break;
893 case SMB_FIND_FILE_INFO_STANDARD:
894 cifs_std_info_to_fattr(&fattr,
895 (FIND_FILE_STANDARD_INFO *)find_entry,
896 cifs_sb);
897 break;
898 case SMB_FIND_FILE_ID_FULL_DIR_INFO:
899 cifs_fulldir_info_to_fattr(&fattr,
900 (SEARCH_ID_FULL_DIR_INFO *)find_entry,
901 cifs_sb);
902 break;
903 default:
904 cifs_dir_info_to_fattr(&fattr,
905 (FILE_DIRECTORY_INFO *)find_entry,
906 cifs_sb);
907 break;
908 }
909
910 if (de.ino && (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM)) {
911 fattr.cf_uniqueid = de.ino;
912 } else {
913 fattr.cf_uniqueid = iunique(sb, ROOT_I);
914 cifs_autodisable_serverino(cifs_sb);
915 }
916
917 if ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MF_SYMLINKS) &&
918 couldbe_mf_symlink(&fattr))
919 /*
920 * trying to get the type and mode can be slow,
921 * so just call those regular files for now, and mark
922 * for reval
923 */
924 fattr.cf_flags |= CIFS_FATTR_NEED_REVAL;
925
926 cifs_prime_dcache(file_dentry(file), &name, &fattr);
927
928 ino = cifs_uniqueid_to_ino_t(fattr.cf_uniqueid);
929 return !dir_emit(ctx, name.name, name.len, ino, fattr.cf_dtype);
930 }
931
932
933 int cifs_readdir(struct file *file, struct dir_context *ctx)
934 {
935 int rc = 0;
936 unsigned int xid;
937 int i;
938 struct cifs_tcon *tcon;
939 struct cifsFileInfo *cifsFile = NULL;
940 char *current_entry;
941 int num_to_fill = 0;
942 char *tmp_buf = NULL;
943 char *end_of_smb;
944 unsigned int max_len;
945 char *full_path = NULL;
946
947 xid = get_xid();
948
949 full_path = build_path_from_dentry(file_dentry(file));
950 if (full_path == NULL) {
951 rc = -ENOMEM;
952 goto rddir2_exit;
953 }
954
955 /*
956 * Ensure FindFirst doesn't fail before doing filldir() for '.' and
957 * '..'. Otherwise we won't be able to notify VFS in case of failure.
958 */
959 if (file->private_data == NULL) {
960 rc = initiate_cifs_search(xid, file, full_path);
961 cifs_dbg(FYI, "initiate cifs search rc %d\n", rc);
962 if (rc)
963 goto rddir2_exit;
964 }
965
966 if (!dir_emit_dots(file, ctx))
967 goto rddir2_exit;
968
969 /* 1) If search is active,
970 is in current search buffer?
971 if it before then restart search
972 if after then keep searching till find it */
973
974 cifsFile = file->private_data;
975 if (cifsFile->srch_inf.endOfSearch) {
976 if (cifsFile->srch_inf.emptyDir) {
977 cifs_dbg(FYI, "End of search, empty dir\n");
978 rc = 0;
979 goto rddir2_exit;
980 }
981 } /* else {
982 cifsFile->invalidHandle = true;
983 tcon->ses->server->close(xid, tcon, &cifsFile->fid);
984 } */
985
986 tcon = tlink_tcon(cifsFile->tlink);
987 rc = find_cifs_entry(xid, tcon, ctx->pos, file, full_path,
988 &current_entry, &num_to_fill);
989 if (rc) {
990 cifs_dbg(FYI, "fce error %d\n", rc);
991 goto rddir2_exit;
992 } else if (current_entry != NULL) {
993 cifs_dbg(FYI, "entry %lld found\n", ctx->pos);
994 } else {
995 cifs_dbg(FYI, "Could not find entry\n");
996 goto rddir2_exit;
997 }
998 cifs_dbg(FYI, "loop through %d times filling dir for net buf %p\n",
999 num_to_fill, cifsFile->srch_inf.ntwrk_buf_start);
1000 max_len = tcon->ses->server->ops->calc_smb_size(
1001 cifsFile->srch_inf.ntwrk_buf_start,
1002 tcon->ses->server);
1003 end_of_smb = cifsFile->srch_inf.ntwrk_buf_start + max_len;
1004
1005 tmp_buf = kmalloc(UNICODE_NAME_MAX, GFP_KERNEL);
1006 if (tmp_buf == NULL) {
1007 rc = -ENOMEM;
1008 goto rddir2_exit;
1009 }
1010
1011 for (i = 0; i < num_to_fill; i++) {
1012 if (current_entry == NULL) {
1013 /* evaluate whether this case is an error */
1014 cifs_dbg(VFS, "past SMB end, num to fill %d i %d\n",
1015 num_to_fill, i);
1016 break;
1017 }
1018 /*
1019 * if buggy server returns . and .. late do we want to
1020 * check for that here?
1021 */
1022 *tmp_buf = 0;
1023 rc = cifs_filldir(current_entry, file, ctx,
1024 tmp_buf, max_len);
1025 if (rc) {
1026 if (rc > 0)
1027 rc = 0;
1028 break;
1029 }
1030
1031 ctx->pos++;
1032 if (ctx->pos ==
1033 cifsFile->srch_inf.index_of_last_entry) {
1034 cifs_dbg(FYI, "last entry in buf at pos %lld %s\n",
1035 ctx->pos, tmp_buf);
1036 cifs_save_resume_key(current_entry, cifsFile);
1037 break;
1038 } else
1039 current_entry =
1040 nxt_dir_entry(current_entry, end_of_smb,
1041 cifsFile->srch_inf.info_level);
1042 }
1043 kfree(tmp_buf);
1044
1045 rddir2_exit:
1046 kfree(full_path);
1047 free_xid(xid);
1048 return rc;
1049 }
Linux with added FPC-III support