Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* |
2 | * fs/cifs/readdir.c | |
3 | * | |
4 | * Directory search handling | |
6dc0f87e | 5 | * |
ad7a2926 | 6 | * Copyright (C) International Business Machines Corp., 2004, 2008 |
cda0ec6a | 7 | * Copyright (C) Red Hat, Inc., 2011 |
1da177e4 LT |
8 | * Author(s): Steve French (sfrench@us.ibm.com) |
9 | * | |
10 | * This library is free software; you can redistribute it and/or modify | |
11 | * it under the terms of the GNU Lesser General Public License as published | |
12 | * by the Free Software Foundation; either version 2.1 of the License, or | |
13 | * (at your option) any later version. | |
14 | * | |
15 | * This library is distributed in the hope that it will be useful, | |
16 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
17 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See | |
18 | * the GNU Lesser General Public License for more details. | |
19 | * | |
20 | * You should have received a copy of the GNU Lesser General Public License | |
21 | * along with this library; if not, write to the Free Software | |
22 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA | |
23 | */ | |
24 | #include <linux/fs.h> | |
273d81d6 | 25 | #include <linux/pagemap.h> |
5a0e3ad6 | 26 | #include <linux/slab.h> |
1da177e4 | 27 | #include <linux/stat.h> |
1da177e4 LT |
28 | #include "cifspdu.h" |
29 | #include "cifsglob.h" | |
30 | #include "cifsproto.h" | |
31 | #include "cifs_unicode.h" | |
32 | #include "cifs_debug.h" | |
33 | #include "cifs_fs_sb.h" | |
34 | #include "cifsfs.h" | |
35 | ||
f5884166 JL |
36 | /* |
37 | * To be safe - for UCS to UTF-8 with strings loaded with the rare long | |
38 | * characters alloc more to account for such multibyte target UTF-8 | |
39 | * characters. | |
40 | */ | |
41 | #define UNICODE_NAME_MAX ((4 * NAME_MAX) + 2) | |
42 | ||
3979877e SF |
43 | #ifdef CONFIG_CIFS_DEBUG2 |
44 | static void dump_cifs_file_struct(struct file *file, char *label) | |
1da177e4 | 45 | { |
6dc0f87e | 46 | struct cifsFileInfo *cf; |
1da177e4 | 47 | |
4523cc30 | 48 | if (file) { |
1da177e4 | 49 | cf = file->private_data; |
4523cc30 | 50 | if (cf == NULL) { |
b6b38f70 | 51 | cFYI(1, "empty cifs private file data"); |
1da177e4 LT |
52 | return; |
53 | } | |
ad7a2926 | 54 | if (cf->invalidHandle) |
b6b38f70 | 55 | cFYI(1, "invalid handle"); |
ad7a2926 | 56 | if (cf->srch_inf.endOfSearch) |
b6b38f70 | 57 | cFYI(1, "end of search"); |
ad7a2926 | 58 | if (cf->srch_inf.emptyDir) |
b6b38f70 | 59 | cFYI(1, "empty dir"); |
1da177e4 | 60 | } |
3979877e | 61 | } |
90c81e0b SF |
62 | #else |
63 | static inline void dump_cifs_file_struct(struct file *file, char *label) | |
64 | { | |
65 | } | |
3979877e | 66 | #endif /* DEBUG2 */ |
1da177e4 | 67 | |
cc0bad75 JL |
68 | /* |
69 | * Find the dentry that matches "name". If there isn't one, create one. If it's | |
70 | * a negative dentry or the uniqueid changed, then drop it and recreate it. | |
71 | */ | |
72 | static struct dentry * | |
73 | cifs_readdir_lookup(struct dentry *parent, struct qstr *name, | |
74 | struct cifs_fattr *fattr) | |
75 | { | |
76 | struct dentry *dentry, *alias; | |
77 | struct inode *inode; | |
78 | struct super_block *sb = parent->d_inode->i_sb; | |
79 | ||
b6b38f70 | 80 | cFYI(1, "For %s", name->name); |
cc0bad75 | 81 | |
05507fa2 | 82 | if (parent->d_op && parent->d_op->d_hash) |
b1e6a015 | 83 | parent->d_op->d_hash(parent, parent->d_inode, name); |
05507fa2 JL |
84 | else |
85 | name->hash = full_name_hash(name->name, name->len); | |
86 | ||
cc0bad75 JL |
87 | dentry = d_lookup(parent, name); |
88 | if (dentry) { | |
0903a0c8 | 89 | int err; |
cd60042c JL |
90 | inode = dentry->d_inode; |
91 | /* update inode in place if i_ino didn't change */ | |
92 | if (inode && CIFS_I(inode)->uniqueid == fattr->cf_uniqueid) { | |
93 | cifs_fattr_to_inode(inode, fattr); | |
cc0bad75 | 94 | return dentry; |
cd60042c | 95 | } |
0903a0c8 | 96 | err = d_invalidate(dentry); |
cc0bad75 | 97 | dput(dentry); |
0903a0c8 AV |
98 | if (err) |
99 | return NULL; | |
cc0bad75 JL |
100 | } |
101 | ||
102 | dentry = d_alloc(parent, name); | |
103 | if (dentry == NULL) | |
104 | return NULL; | |
105 | ||
106 | inode = cifs_iget(sb, fattr); | |
107 | if (!inode) { | |
108 | dput(dentry); | |
109 | return NULL; | |
110 | } | |
111 | ||
cc0bad75 JL |
112 | alias = d_materialise_unique(dentry, inode); |
113 | if (alias != NULL) { | |
114 | dput(dentry); | |
115 | if (IS_ERR(alias)) | |
116 | return NULL; | |
117 | dentry = alias; | |
118 | } | |
119 | ||
120 | return dentry; | |
121 | } | |
122 | ||
0b8f18e3 JL |
123 | static void |
124 | cifs_fill_common_info(struct cifs_fattr *fattr, struct cifs_sb_info *cifs_sb) | |
1da177e4 | 125 | { |
0b8f18e3 JL |
126 | fattr->cf_uid = cifs_sb->mnt_uid; |
127 | fattr->cf_gid = cifs_sb->mnt_gid; | |
1da177e4 | 128 | |
0b8f18e3 JL |
129 | if (fattr->cf_cifsattrs & ATTR_DIRECTORY) { |
130 | fattr->cf_mode = S_IFDIR | cifs_sb->mnt_dir_mode; | |
131 | fattr->cf_dtype = DT_DIR; | |
1da177e4 | 132 | } else { |
0b8f18e3 JL |
133 | fattr->cf_mode = S_IFREG | cifs_sb->mnt_file_mode; |
134 | fattr->cf_dtype = DT_REG; | |
1da177e4 LT |
135 | } |
136 | ||
0b8f18e3 JL |
137 | if (fattr->cf_cifsattrs & ATTR_READONLY) |
138 | fattr->cf_mode &= ~S_IWUGO; | |
5bafd765 | 139 | |
0b8f18e3 JL |
140 | if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_UNX_EMUL && |
141 | fattr->cf_cifsattrs & ATTR_SYSTEM) { | |
142 | if (fattr->cf_eof == 0) { | |
143 | fattr->cf_mode &= ~S_IFMT; | |
144 | fattr->cf_mode |= S_IFIFO; | |
145 | fattr->cf_dtype = DT_FIFO; | |
3020a1f5 | 146 | } else { |
4468eb3f | 147 | /* |
0b8f18e3 JL |
148 | * trying to get the type and mode via SFU can be slow, |
149 | * so just call those regular files for now, and mark | |
150 | * for reval | |
4468eb3f | 151 | */ |
0b8f18e3 | 152 | fattr->cf_flags |= CIFS_FATTR_NEED_REVAL; |
4468eb3f JL |
153 | } |
154 | } | |
0b8f18e3 | 155 | } |
1da177e4 | 156 | |
c052e2b4 | 157 | void |
0b8f18e3 JL |
158 | cifs_dir_info_to_fattr(struct cifs_fattr *fattr, FILE_DIRECTORY_INFO *info, |
159 | struct cifs_sb_info *cifs_sb) | |
160 | { | |
161 | memset(fattr, 0, sizeof(*fattr)); | |
162 | fattr->cf_cifsattrs = le32_to_cpu(info->ExtFileAttributes); | |
163 | fattr->cf_eof = le64_to_cpu(info->EndOfFile); | |
164 | fattr->cf_bytes = le64_to_cpu(info->AllocationSize); | |
20054bd6 | 165 | fattr->cf_createtime = le64_to_cpu(info->CreationTime); |
0b8f18e3 JL |
166 | fattr->cf_atime = cifs_NTtimeToUnix(info->LastAccessTime); |
167 | fattr->cf_ctime = cifs_NTtimeToUnix(info->ChangeTime); | |
168 | fattr->cf_mtime = cifs_NTtimeToUnix(info->LastWriteTime); | |
169 | ||
170 | cifs_fill_common_info(fattr, cifs_sb); | |
171 | } | |
1da177e4 | 172 | |
15dd4781 | 173 | static void |
0b8f18e3 JL |
174 | cifs_std_info_to_fattr(struct cifs_fattr *fattr, FIND_FILE_STANDARD_INFO *info, |
175 | struct cifs_sb_info *cifs_sb) | |
176 | { | |
0d424ad0 | 177 | int offset = cifs_sb_master_tcon(cifs_sb)->ses->server->timeAdj; |
1da177e4 | 178 | |
0b8f18e3 JL |
179 | memset(fattr, 0, sizeof(*fattr)); |
180 | fattr->cf_atime = cnvrtDosUnixTm(info->LastAccessDate, | |
181 | info->LastAccessTime, offset); | |
182 | fattr->cf_ctime = cnvrtDosUnixTm(info->LastWriteDate, | |
183 | info->LastWriteTime, offset); | |
184 | fattr->cf_mtime = cnvrtDosUnixTm(info->LastWriteDate, | |
185 | info->LastWriteTime, offset); | |
186 | ||
187 | fattr->cf_cifsattrs = le16_to_cpu(info->Attributes); | |
188 | fattr->cf_bytes = le32_to_cpu(info->AllocationSize); | |
189 | fattr->cf_eof = le32_to_cpu(info->DataSize); | |
190 | ||
191 | cifs_fill_common_info(fattr, cifs_sb); | |
1da177e4 LT |
192 | } |
193 | ||
0e0d2cf3 SF |
194 | /* BB eventually need to add the following helper function to |
195 | resolve NT_STATUS_STOPPED_ON_SYMLINK return code when | |
196 | we try to do FindFirst on (NTFS) directory symlinks */ | |
197 | /* | |
198 | int get_symlink_reparse_path(char *full_path, struct cifs_sb_info *cifs_sb, | |
6d5786a3 | 199 | unsigned int xid) |
0e0d2cf3 SF |
200 | { |
201 | __u16 fid; | |
202 | int len; | |
203 | int oplock = 0; | |
204 | int rc; | |
96daf2b0 | 205 | struct cifs_tcon *ptcon = cifs_sb_tcon(cifs_sb); |
0e0d2cf3 SF |
206 | char *tmpbuffer; |
207 | ||
208 | rc = CIFSSMBOpen(xid, ptcon, full_path, FILE_OPEN, GENERIC_READ, | |
209 | OPEN_REPARSE_POINT, &fid, &oplock, NULL, | |
210 | cifs_sb->local_nls, | |
211 | cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR); | |
212 | if (!rc) { | |
213 | tmpbuffer = kmalloc(maxpath); | |
214 | rc = CIFSSMBQueryReparseLinkInfo(xid, ptcon, full_path, | |
215 | tmpbuffer, | |
216 | maxpath -1, | |
217 | fid, | |
218 | cifs_sb->local_nls); | |
219 | if (CIFSSMBClose(xid, ptcon, fid)) { | |
b6b38f70 | 220 | cFYI(1, "Error closing temporary reparsepoint open"); |
0e0d2cf3 SF |
221 | } |
222 | } | |
223 | } | |
224 | */ | |
225 | ||
92fc65a7 PS |
226 | static int |
227 | initiate_cifs_search(const unsigned int xid, struct file *file) | |
1da177e4 | 228 | { |
2608bee7 | 229 | __u16 search_flags; |
1da177e4 | 230 | int rc = 0; |
7ffec372 | 231 | char *full_path = NULL; |
3870253e | 232 | struct cifsFileInfo *cifsFile; |
7ffec372 | 233 | struct cifs_sb_info *cifs_sb = CIFS_SB(file->f_path.dentry->d_sb); |
59c55ba1 | 234 | struct tcon_link *tlink = NULL; |
29e20f9c | 235 | struct cifs_tcon *tcon; |
92fc65a7 | 236 | struct TCP_Server_Info *server; |
1da177e4 | 237 | |
7ffec372 | 238 | if (file->private_data == NULL) { |
59c55ba1 JL |
239 | tlink = cifs_sb_tlink(cifs_sb); |
240 | if (IS_ERR(tlink)) | |
241 | return PTR_ERR(tlink); | |
242 | ||
243 | cifsFile = kzalloc(sizeof(struct cifsFileInfo), GFP_KERNEL); | |
244 | if (cifsFile == NULL) { | |
245 | rc = -ENOMEM; | |
246 | goto error_exit; | |
247 | } | |
248 | file->private_data = cifsFile; | |
249 | cifsFile->tlink = cifs_get_tlink(tlink); | |
29e20f9c | 250 | tcon = tlink_tcon(tlink); |
59c55ba1 JL |
251 | } else { |
252 | cifsFile = file->private_data; | |
29e20f9c | 253 | tcon = tlink_tcon(cifsFile->tlink); |
7ffec372 | 254 | } |
1da177e4 | 255 | |
92fc65a7 PS |
256 | server = tcon->ses->server; |
257 | ||
258 | if (!server->ops->query_dir_first) { | |
259 | rc = -ENOSYS; | |
260 | goto error_exit; | |
261 | } | |
262 | ||
4b18f2a9 SF |
263 | cifsFile->invalidHandle = true; |
264 | cifsFile->srch_inf.endOfSearch = false; | |
1da177e4 | 265 | |
e6a00296 | 266 | full_path = build_path_from_dentry(file->f_path.dentry); |
7ffec372 JL |
267 | if (full_path == NULL) { |
268 | rc = -ENOMEM; | |
269 | goto error_exit; | |
270 | } | |
1da177e4 | 271 | |
b6b38f70 | 272 | cFYI(1, "Full path: %s start at: %lld", full_path, file->f_pos); |
1da177e4 | 273 | |
75cf6bdc | 274 | ffirst_retry: |
1da177e4 | 275 | /* test for Unix extensions */ |
c18c842b | 276 | /* but now check for them on the share/mount not on the SMB session */ |
29e20f9c PS |
277 | /* if (cap_unix(tcon->ses) { */ |
278 | if (tcon->unix_ext) | |
5bafd765 | 279 | cifsFile->srch_inf.info_level = SMB_FIND_FILE_UNIX; |
29e20f9c PS |
280 | else if ((tcon->ses->capabilities & |
281 | tcon->ses->server->vals->cap_nt_find) == 0) { | |
5bafd765 | 282 | cifsFile->srch_inf.info_level = SMB_FIND_FILE_INFO_STANDARD; |
1da177e4 LT |
283 | } else if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM) { |
284 | cifsFile->srch_inf.info_level = SMB_FIND_FILE_ID_FULL_DIR_INFO; | |
285 | } else /* not srvinos - BB fixme add check for backlevel? */ { | |
286 | cifsFile->srch_inf.info_level = SMB_FIND_FILE_DIRECTORY_INFO; | |
287 | } | |
288 | ||
2608bee7 SP |
289 | search_flags = CIFS_SEARCH_CLOSE_AT_END | CIFS_SEARCH_RETURN_RESUME; |
290 | if (backup_cred(cifs_sb)) | |
291 | search_flags |= CIFS_SEARCH_BACKUP_SEARCH; | |
292 | ||
92fc65a7 PS |
293 | rc = server->ops->query_dir_first(xid, tcon, full_path, cifs_sb, |
294 | &cifsFile->fid, search_flags, | |
295 | &cifsFile->srch_inf); | |
296 | ||
4523cc30 | 297 | if (rc == 0) |
4b18f2a9 | 298 | cifsFile->invalidHandle = false; |
e836f015 | 299 | /* BB add following call to handle readdir on new NTFS symlink errors |
0e0d2cf3 SF |
300 | else if STATUS_STOPPED_ON_SYMLINK |
301 | call get_symlink_reparse_path and retry with new path */ | |
302 | else if ((rc == -EOPNOTSUPP) && | |
75cf6bdc SF |
303 | (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM)) { |
304 | cifs_sb->mnt_cifs_flags &= ~CIFS_MOUNT_SERVER_INUM; | |
305 | goto ffirst_retry; | |
306 | } | |
7ffec372 | 307 | error_exit: |
1da177e4 | 308 | kfree(full_path); |
7ffec372 | 309 | cifs_put_tlink(tlink); |
1da177e4 LT |
310 | return rc; |
311 | } | |
312 | ||
313 | /* return length of unicode string in bytes */ | |
cda0ec6a | 314 | static int cifs_unicode_bytelen(const char *str) |
1da177e4 LT |
315 | { |
316 | int len; | |
cda0ec6a | 317 | const __le16 *ustr = (const __le16 *)str; |
1da177e4 | 318 | |
3870253e | 319 | for (len = 0; len <= PATH_MAX; len++) { |
4523cc30 | 320 | if (ustr[len] == 0) |
1da177e4 LT |
321 | return len << 1; |
322 | } | |
b6b38f70 | 323 | cFYI(1, "Unicode string longer than PATH_MAX found"); |
1da177e4 LT |
324 | return len << 1; |
325 | } | |
326 | ||
5bafd765 | 327 | static char *nxt_dir_entry(char *old_entry, char *end_of_smb, int level) |
1da177e4 | 328 | { |
3870253e | 329 | char *new_entry; |
ad7a2926 | 330 | FILE_DIRECTORY_INFO *pDirInfo = (FILE_DIRECTORY_INFO *)old_entry; |
1da177e4 | 331 | |
4523cc30 | 332 | if (level == SMB_FIND_FILE_INFO_STANDARD) { |
ad7a2926 | 333 | FIND_FILE_STANDARD_INFO *pfData; |
5bafd765 SF |
334 | pfData = (FIND_FILE_STANDARD_INFO *)pDirInfo; |
335 | ||
336 | new_entry = old_entry + sizeof(FIND_FILE_STANDARD_INFO) + | |
337 | pfData->FileNameLength; | |
338 | } else | |
339 | new_entry = old_entry + le32_to_cpu(pDirInfo->NextEntryOffset); | |
b6b38f70 | 340 | cFYI(1, "new entry %p old entry %p", new_entry, old_entry); |
1da177e4 | 341 | /* validate that new_entry is not past end of SMB */ |
4523cc30 | 342 | if (new_entry >= end_of_smb) { |
b6b38f70 JP |
343 | cERROR(1, "search entry %p began after end of SMB %p old entry %p", |
344 | new_entry, end_of_smb, old_entry); | |
1da177e4 | 345 | return NULL; |
4523cc30 | 346 | } else if (((level == SMB_FIND_FILE_INFO_STANDARD) && |
3870253e SF |
347 | (new_entry + sizeof(FIND_FILE_STANDARD_INFO) > end_of_smb)) |
348 | || ((level != SMB_FIND_FILE_INFO_STANDARD) && | |
5bafd765 | 349 | (new_entry + sizeof(FILE_DIRECTORY_INFO) > end_of_smb))) { |
b6b38f70 JP |
350 | cERROR(1, "search entry %p extends after end of SMB %p", |
351 | new_entry, end_of_smb); | |
09d1db5c | 352 | return NULL; |
3870253e | 353 | } else |
1da177e4 LT |
354 | return new_entry; |
355 | ||
356 | } | |
357 | ||
cda0ec6a CH |
358 | struct cifs_dirent { |
359 | const char *name; | |
360 | size_t namelen; | |
361 | u32 resume_key; | |
362 | u64 ino; | |
363 | }; | |
364 | ||
365 | static void cifs_fill_dirent_unix(struct cifs_dirent *de, | |
366 | const FILE_UNIX_INFO *info, bool is_unicode) | |
367 | { | |
368 | de->name = &info->FileName[0]; | |
369 | if (is_unicode) | |
370 | de->namelen = cifs_unicode_bytelen(de->name); | |
371 | else | |
372 | de->namelen = strnlen(de->name, PATH_MAX); | |
373 | de->resume_key = info->ResumeKey; | |
374 | de->ino = le64_to_cpu(info->basic.UniqueId); | |
375 | } | |
376 | ||
377 | static void cifs_fill_dirent_dir(struct cifs_dirent *de, | |
378 | const FILE_DIRECTORY_INFO *info) | |
379 | { | |
380 | de->name = &info->FileName[0]; | |
381 | de->namelen = le32_to_cpu(info->FileNameLength); | |
382 | de->resume_key = info->FileIndex; | |
383 | } | |
384 | ||
385 | static void cifs_fill_dirent_full(struct cifs_dirent *de, | |
386 | const FILE_FULL_DIRECTORY_INFO *info) | |
387 | { | |
388 | de->name = &info->FileName[0]; | |
389 | de->namelen = le32_to_cpu(info->FileNameLength); | |
390 | de->resume_key = info->FileIndex; | |
391 | } | |
392 | ||
393 | static void cifs_fill_dirent_search(struct cifs_dirent *de, | |
394 | const SEARCH_ID_FULL_DIR_INFO *info) | |
395 | { | |
396 | de->name = &info->FileName[0]; | |
397 | de->namelen = le32_to_cpu(info->FileNameLength); | |
398 | de->resume_key = info->FileIndex; | |
399 | de->ino = le64_to_cpu(info->UniqueId); | |
400 | } | |
401 | ||
402 | static void cifs_fill_dirent_both(struct cifs_dirent *de, | |
403 | const FILE_BOTH_DIRECTORY_INFO *info) | |
404 | { | |
405 | de->name = &info->FileName[0]; | |
406 | de->namelen = le32_to_cpu(info->FileNameLength); | |
407 | de->resume_key = info->FileIndex; | |
408 | } | |
409 | ||
410 | static void cifs_fill_dirent_std(struct cifs_dirent *de, | |
411 | const FIND_FILE_STANDARD_INFO *info) | |
412 | { | |
413 | de->name = &info->FileName[0]; | |
414 | /* one byte length, no endianess conversion */ | |
415 | de->namelen = info->FileNameLength; | |
416 | de->resume_key = info->ResumeKey; | |
417 | } | |
418 | ||
419 | static int cifs_fill_dirent(struct cifs_dirent *de, const void *info, | |
420 | u16 level, bool is_unicode) | |
421 | { | |
422 | memset(de, 0, sizeof(*de)); | |
423 | ||
424 | switch (level) { | |
425 | case SMB_FIND_FILE_UNIX: | |
426 | cifs_fill_dirent_unix(de, info, is_unicode); | |
427 | break; | |
428 | case SMB_FIND_FILE_DIRECTORY_INFO: | |
429 | cifs_fill_dirent_dir(de, info); | |
430 | break; | |
431 | case SMB_FIND_FILE_FULL_DIRECTORY_INFO: | |
432 | cifs_fill_dirent_full(de, info); | |
433 | break; | |
434 | case SMB_FIND_FILE_ID_FULL_DIR_INFO: | |
435 | cifs_fill_dirent_search(de, info); | |
436 | break; | |
437 | case SMB_FIND_FILE_BOTH_DIRECTORY_INFO: | |
438 | cifs_fill_dirent_both(de, info); | |
439 | break; | |
440 | case SMB_FIND_FILE_INFO_STANDARD: | |
441 | cifs_fill_dirent_std(de, info); | |
442 | break; | |
443 | default: | |
444 | cFYI(1, "Unknown findfirst level %d", level); | |
445 | return -EINVAL; | |
446 | } | |
447 | ||
448 | return 0; | |
449 | } | |
450 | ||
1da177e4 LT |
451 | #define UNICODE_DOT cpu_to_le16(0x2e) |
452 | ||
453 | /* return 0 if no match and 1 for . (current directory) and 2 for .. (parent) */ | |
cda0ec6a | 454 | static int cifs_entry_is_dot(struct cifs_dirent *de, bool is_unicode) |
1da177e4 LT |
455 | { |
456 | int rc = 0; | |
1da177e4 | 457 | |
cda0ec6a CH |
458 | if (!de->name) |
459 | return 0; | |
1da177e4 | 460 | |
cda0ec6a CH |
461 | if (is_unicode) { |
462 | __le16 *ufilename = (__le16 *)de->name; | |
463 | if (de->namelen == 2) { | |
464 | /* check for . */ | |
465 | if (ufilename[0] == UNICODE_DOT) | |
466 | rc = 1; | |
467 | } else if (de->namelen == 4) { | |
468 | /* check for .. */ | |
469 | if (ufilename[0] == UNICODE_DOT && | |
470 | ufilename[1] == UNICODE_DOT) | |
471 | rc = 2; | |
472 | } | |
473 | } else /* ASCII */ { | |
474 | if (de->namelen == 1) { | |
475 | if (de->name[0] == '.') | |
476 | rc = 1; | |
477 | } else if (de->namelen == 2) { | |
478 | if (de->name[0] == '.' && de->name[1] == '.') | |
479 | rc = 2; | |
1da177e4 LT |
480 | } |
481 | } | |
482 | ||
483 | return rc; | |
484 | } | |
485 | ||
eafe8701 SF |
486 | /* Check if directory that we are searching has changed so we can decide |
487 | whether we can use the cached search results from the previous search */ | |
3870253e | 488 | static int is_dir_changed(struct file *file) |
eafe8701 | 489 | { |
c33f8d32 CH |
490 | struct inode *inode = file->f_path.dentry->d_inode; |
491 | struct cifsInodeInfo *cifsInfo = CIFS_I(inode); | |
eafe8701 | 492 | |
c33f8d32 | 493 | if (cifsInfo->time == 0) |
eafe8701 SF |
494 | return 1; /* directory was changed, perhaps due to unlink */ |
495 | else | |
496 | return 0; | |
497 | ||
498 | } | |
499 | ||
0752f152 | 500 | static int cifs_save_resume_key(const char *current_entry, |
eaf35b1e | 501 | struct cifsFileInfo *file_info) |
0752f152 | 502 | { |
eaf35b1e CH |
503 | struct cifs_dirent de; |
504 | int rc; | |
0752f152 | 505 | |
eaf35b1e CH |
506 | rc = cifs_fill_dirent(&de, current_entry, file_info->srch_inf.info_level, |
507 | file_info->srch_inf.unicode); | |
508 | if (!rc) { | |
509 | file_info->srch_inf.presume_name = de.name; | |
510 | file_info->srch_inf.resume_name_len = de.namelen; | |
511 | file_info->srch_inf.resume_key = de.resume_key; | |
0752f152 | 512 | } |
0752f152 SF |
513 | return rc; |
514 | } | |
515 | ||
92fc65a7 PS |
516 | /* |
517 | * Find the corresponding entry in the search. Note that the SMB server returns | |
518 | * search entries for . and .. which complicates logic here if we choose to | |
519 | * parse for them and we do not assume that they are located in the findfirst | |
520 | * return buffer. We start counting in the buffer with entry 2 and increment for | |
521 | * every entry (do not increment for . or .. entry). | |
522 | */ | |
523 | static int | |
524 | find_cifs_entry(const unsigned int xid, struct cifs_tcon *tcon, | |
525 | struct file *file, char **current_entry, int *num_to_ret) | |
1da177e4 | 526 | { |
2608bee7 | 527 | __u16 search_flags; |
1da177e4 LT |
528 | int rc = 0; |
529 | int pos_in_buf = 0; | |
530 | loff_t first_entry_in_buffer; | |
531 | loff_t index_to_find = file->f_pos; | |
92fc65a7 | 532 | struct cifsFileInfo *cfile = file->private_data; |
2608bee7 | 533 | struct cifs_sb_info *cifs_sb = CIFS_SB(file->f_path.dentry->d_sb); |
92fc65a7 | 534 | struct TCP_Server_Info *server = tcon->ses->server; |
1da177e4 | 535 | /* check if index in the buffer */ |
50c2f753 | 536 | |
92fc65a7 PS |
537 | if (!server->ops->query_dir_first || !server->ops->query_dir_next) |
538 | return -ENOSYS; | |
539 | ||
540 | if ((cfile == NULL) || (current_entry == NULL) || (num_to_ret == NULL)) | |
1da177e4 | 541 | return -ENOENT; |
50c2f753 | 542 | |
92fc65a7 PS |
543 | *current_entry = NULL; |
544 | first_entry_in_buffer = cfile->srch_inf.index_of_last_entry - | |
545 | cfile->srch_inf.entries_in_buffer; | |
60808233 | 546 | |
92fc65a7 PS |
547 | /* |
548 | * If first entry in buf is zero then is first buffer | |
549 | * in search response data which means it is likely . and .. | |
550 | * will be in this buffer, although some servers do not return | |
551 | * . and .. for the root of a drive and for those we need | |
552 | * to start two entries earlier. | |
553 | */ | |
60808233 | 554 | |
3979877e | 555 | dump_cifs_file_struct(file, "In fce "); |
92fc65a7 PS |
556 | if (((index_to_find < cfile->srch_inf.index_of_last_entry) && |
557 | is_dir_changed(file)) || (index_to_find < first_entry_in_buffer)) { | |
1da177e4 | 558 | /* close and restart search */ |
b6b38f70 | 559 | cFYI(1, "search backing up - close and restart search"); |
4477288a | 560 | spin_lock(&cifs_file_list_lock); |
92fc65a7 PS |
561 | if (!cfile->srch_inf.endOfSearch && !cfile->invalidHandle) { |
562 | cfile->invalidHandle = true; | |
4477288a | 563 | spin_unlock(&cifs_file_list_lock); |
92fc65a7 PS |
564 | if (server->ops->close) |
565 | server->ops->close(xid, tcon, &cfile->fid); | |
ddb4cbfc | 566 | } else |
4477288a | 567 | spin_unlock(&cifs_file_list_lock); |
92fc65a7 | 568 | if (cfile->srch_inf.ntwrk_buf_start) { |
b6b38f70 | 569 | cFYI(1, "freeing SMB ff cache buf on search rewind"); |
92fc65a7 PS |
570 | if (cfile->srch_inf.smallBuf) |
571 | cifs_small_buf_release(cfile->srch_inf. | |
d47d7c1a SF |
572 | ntwrk_buf_start); |
573 | else | |
92fc65a7 | 574 | cifs_buf_release(cfile->srch_inf. |
d47d7c1a | 575 | ntwrk_buf_start); |
92fc65a7 | 576 | cfile->srch_inf.ntwrk_buf_start = NULL; |
1da177e4 | 577 | } |
3870253e | 578 | rc = initiate_cifs_search(xid, file); |
4523cc30 | 579 | if (rc) { |
b6b38f70 JP |
580 | cFYI(1, "error %d reinitiating a search on rewind", |
581 | rc); | |
1da177e4 LT |
582 | return rc; |
583 | } | |
7023676f | 584 | /* FindFirst/Next set last_entry to NULL on malformed reply */ |
92fc65a7 PS |
585 | if (cfile->srch_inf.last_entry) |
586 | cifs_save_resume_key(cfile->srch_inf.last_entry, cfile); | |
1da177e4 LT |
587 | } |
588 | ||
2608bee7 SP |
589 | search_flags = CIFS_SEARCH_CLOSE_AT_END | CIFS_SEARCH_RETURN_RESUME; |
590 | if (backup_cred(cifs_sb)) | |
591 | search_flags |= CIFS_SEARCH_BACKUP_SEARCH; | |
592 | ||
92fc65a7 PS |
593 | while ((index_to_find >= cfile->srch_inf.index_of_last_entry) && |
594 | (rc == 0) && !cfile->srch_inf.endOfSearch) { | |
b6b38f70 | 595 | cFYI(1, "calling findnext2"); |
92fc65a7 PS |
596 | rc = server->ops->query_dir_next(xid, tcon, &cfile->fid, |
597 | search_flags, | |
598 | &cfile->srch_inf); | |
7023676f | 599 | /* FindFirst/Next set last_entry to NULL on malformed reply */ |
92fc65a7 PS |
600 | if (cfile->srch_inf.last_entry) |
601 | cifs_save_resume_key(cfile->srch_inf.last_entry, cfile); | |
4523cc30 | 602 | if (rc) |
1da177e4 LT |
603 | return -ENOENT; |
604 | } | |
92fc65a7 | 605 | if (index_to_find < cfile->srch_inf.index_of_last_entry) { |
1da177e4 LT |
606 | /* we found the buffer that contains the entry */ |
607 | /* scan and find it */ | |
608 | int i; | |
92fc65a7 PS |
609 | char *cur_ent; |
610 | char *end_of_smb = cfile->srch_inf.ntwrk_buf_start + | |
611 | server->ops->calc_smb_size( | |
612 | cfile->srch_inf.ntwrk_buf_start); | |
613 | ||
614 | cur_ent = cfile->srch_inf.srch_entries_start; | |
615 | first_entry_in_buffer = cfile->srch_inf.index_of_last_entry | |
616 | - cfile->srch_inf.entries_in_buffer; | |
1da177e4 | 617 | pos_in_buf = index_to_find - first_entry_in_buffer; |
b6b38f70 | 618 | cFYI(1, "found entry - pos_in_buf %d", pos_in_buf); |
5bafd765 | 619 | |
92fc65a7 | 620 | for (i = 0; (i < (pos_in_buf)) && (cur_ent != NULL); i++) { |
dfb7533b | 621 | /* go entry by entry figuring out which is first */ |
92fc65a7 PS |
622 | cur_ent = nxt_dir_entry(cur_ent, end_of_smb, |
623 | cfile->srch_inf.info_level); | |
1da177e4 | 624 | } |
92fc65a7 | 625 | if ((cur_ent == NULL) && (i < pos_in_buf)) { |
1da177e4 | 626 | /* BB fixme - check if we should flag this error */ |
b6b38f70 | 627 | cERROR(1, "reached end of buf searching for pos in buf" |
92fc65a7 PS |
628 | " %d index to find %lld rc %d", pos_in_buf, |
629 | index_to_find, rc); | |
1da177e4 LT |
630 | } |
631 | rc = 0; | |
92fc65a7 | 632 | *current_entry = cur_ent; |
1da177e4 | 633 | } else { |
b6b38f70 | 634 | cFYI(1, "index not in buffer - could not findnext into it"); |
1da177e4 LT |
635 | return 0; |
636 | } | |
637 | ||
92fc65a7 | 638 | if (pos_in_buf >= cfile->srch_inf.entries_in_buffer) { |
b6b38f70 | 639 | cFYI(1, "can not return entries pos_in_buf beyond last"); |
1da177e4 LT |
640 | *num_to_ret = 0; |
641 | } else | |
92fc65a7 | 642 | *num_to_ret = cfile->srch_inf.entries_in_buffer - pos_in_buf; |
1da177e4 LT |
643 | |
644 | return rc; | |
645 | } | |
646 | ||
9feed6f8 CH |
647 | static int cifs_filldir(char *find_entry, struct file *file, filldir_t filldir, |
648 | void *dirent, char *scratch_buf, unsigned int max_len) | |
1da177e4 | 649 | { |
9feed6f8 CH |
650 | struct cifsFileInfo *file_info = file->private_data; |
651 | struct super_block *sb = file->f_path.dentry->d_sb; | |
652 | struct cifs_sb_info *cifs_sb = CIFS_SB(sb); | |
cda0ec6a | 653 | struct cifs_dirent de = { NULL, }; |
cc0bad75 | 654 | struct cifs_fattr fattr; |
9feed6f8 CH |
655 | struct dentry *dentry; |
656 | struct qstr name; | |
1da177e4 | 657 | int rc = 0; |
9feed6f8 | 658 | ino_t ino; |
1da177e4 | 659 | |
cda0ec6a CH |
660 | rc = cifs_fill_dirent(&de, find_entry, file_info->srch_inf.info_level, |
661 | file_info->srch_inf.unicode); | |
662 | if (rc) | |
663 | return rc; | |
5bafd765 | 664 | |
f16d59b4 CH |
665 | if (de.namelen > max_len) { |
666 | cERROR(1, "bad search response length %zd past smb end", | |
667 | de.namelen); | |
5bafd765 SF |
668 | return -EINVAL; |
669 | } | |
670 | ||
60808233 | 671 | /* skip . and .. since we added them first */ |
cda0ec6a | 672 | if (cifs_entry_is_dot(&de, file_info->srch_inf.unicode)) |
60808233 SF |
673 | return 0; |
674 | ||
f16d59b4 CH |
675 | if (file_info->srch_inf.unicode) { |
676 | struct nls_table *nlt = cifs_sb->local_nls; | |
1da177e4 | 677 | |
f16d59b4 CH |
678 | name.name = scratch_buf; |
679 | name.len = | |
acbbb76a SF |
680 | cifs_from_utf16((char *)name.name, (__le16 *)de.name, |
681 | UNICODE_NAME_MAX, | |
682 | min_t(size_t, de.namelen, | |
683 | (size_t)max_len), nlt, | |
684 | cifs_sb->mnt_cifs_flags & | |
f16d59b4 CH |
685 | CIFS_MOUNT_MAP_SPECIAL_CHR); |
686 | name.len -= nls_nullsize(nlt); | |
687 | } else { | |
688 | name.name = de.name; | |
689 | name.len = de.namelen; | |
690 | } | |
1da177e4 | 691 | |
9feed6f8 CH |
692 | switch (file_info->srch_inf.info_level) { |
693 | case SMB_FIND_FILE_UNIX: | |
cc0bad75 | 694 | cifs_unix_basic_to_fattr(&fattr, |
9feed6f8 CH |
695 | &((FILE_UNIX_INFO *)find_entry)->basic, |
696 | cifs_sb); | |
697 | break; | |
698 | case SMB_FIND_FILE_INFO_STANDARD: | |
699 | cifs_std_info_to_fattr(&fattr, | |
700 | (FIND_FILE_STANDARD_INFO *)find_entry, | |
701 | cifs_sb); | |
702 | break; | |
703 | default: | |
704 | cifs_dir_info_to_fattr(&fattr, | |
705 | (FILE_DIRECTORY_INFO *)find_entry, | |
706 | cifs_sb); | |
707 | break; | |
708 | } | |
b835bebe | 709 | |
f16d59b4 CH |
710 | if (de.ino && (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM)) { |
711 | fattr.cf_uniqueid = de.ino; | |
ec06aedd | 712 | } else { |
0b8f18e3 | 713 | fattr.cf_uniqueid = iunique(sb, ROOT_I); |
ec06aedd JL |
714 | cifs_autodisable_serverino(cifs_sb); |
715 | } | |
50c2f753 | 716 | |
1b12b9c1 SM |
717 | if ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MF_SYMLINKS) && |
718 | CIFSCouldBeMFSymlink(&fattr)) | |
719 | /* | |
720 | * trying to get the type and mode can be slow, | |
721 | * so just call those regular files for now, and mark | |
722 | * for reval | |
723 | */ | |
724 | fattr.cf_flags |= CIFS_FATTR_NEED_REVAL; | |
725 | ||
0b8f18e3 | 726 | ino = cifs_uniqueid_to_ino_t(fattr.cf_uniqueid); |
9feed6f8 | 727 | dentry = cifs_readdir_lookup(file->f_dentry, &name, &fattr); |
3870253e | 728 | |
9feed6f8 CH |
729 | rc = filldir(dirent, name.name, name.len, file->f_pos, ino, |
730 | fattr.cf_dtype); | |
0b8f18e3 | 731 | |
9feed6f8 | 732 | dput(dentry); |
1da177e4 LT |
733 | return rc; |
734 | } | |
735 | ||
1da177e4 LT |
736 | |
737 | int cifs_readdir(struct file *file, void *direntry, filldir_t filldir) | |
738 | { | |
739 | int rc = 0; | |
6d5786a3 PS |
740 | unsigned int xid; |
741 | int i; | |
92fc65a7 | 742 | struct cifs_tcon *tcon; |
1da177e4 | 743 | struct cifsFileInfo *cifsFile = NULL; |
3870253e | 744 | char *current_entry; |
1da177e4 | 745 | int num_to_fill = 0; |
3870253e | 746 | char *tmp_buf = NULL; |
50c2f753 | 747 | char *end_of_smb; |
18295796 | 748 | unsigned int max_len; |
1da177e4 | 749 | |
6d5786a3 | 750 | xid = get_xid(); |
1da177e4 | 751 | |
6221ddd0 SJ |
752 | /* |
753 | * Ensure FindFirst doesn't fail before doing filldir() for '.' and | |
754 | * '..'. Otherwise we won't be able to notify VFS in case of failure. | |
755 | */ | |
756 | if (file->private_data == NULL) { | |
757 | rc = initiate_cifs_search(xid, file); | |
758 | cFYI(1, "initiate cifs search rc %d", rc); | |
759 | if (rc) | |
760 | goto rddir2_exit; | |
761 | } | |
762 | ||
1da177e4 LT |
763 | switch ((int) file->f_pos) { |
764 | case 0: | |
60808233 | 765 | if (filldir(direntry, ".", 1, file->f_pos, |
e6a00296 | 766 | file->f_path.dentry->d_inode->i_ino, DT_DIR) < 0) { |
b6b38f70 | 767 | cERROR(1, "Filldir for current dir failed"); |
1da177e4 LT |
768 | rc = -ENOMEM; |
769 | break; | |
770 | } | |
60808233 | 771 | file->f_pos++; |
1da177e4 | 772 | case 1: |
60808233 | 773 | if (filldir(direntry, "..", 2, file->f_pos, |
b85fd6bd | 774 | parent_ino(file->f_path.dentry), DT_DIR) < 0) { |
b6b38f70 | 775 | cERROR(1, "Filldir for parent dir failed"); |
1da177e4 LT |
776 | rc = -ENOMEM; |
777 | break; | |
778 | } | |
60808233 SF |
779 | file->f_pos++; |
780 | default: | |
3870253e SF |
781 | /* 1) If search is active, |
782 | is in current search buffer? | |
1da177e4 LT |
783 | if it before then restart search |
784 | if after then keep searching till find it */ | |
785 | ||
790fe579 | 786 | if (file->private_data == NULL) { |
1da177e4 | 787 | rc = -EINVAL; |
6d5786a3 | 788 | free_xid(xid); |
1da177e4 LT |
789 | return rc; |
790 | } | |
791 | cifsFile = file->private_data; | |
792 | if (cifsFile->srch_inf.endOfSearch) { | |
790fe579 | 793 | if (cifsFile->srch_inf.emptyDir) { |
b6b38f70 | 794 | cFYI(1, "End of search, empty dir"); |
1da177e4 LT |
795 | rc = 0; |
796 | break; | |
797 | } | |
798 | } /* else { | |
4b18f2a9 | 799 | cifsFile->invalidHandle = true; |
92fc65a7 | 800 | tcon->ses->server->close(xid, tcon, &cifsFile->fid); |
aaa9bbe0 | 801 | } */ |
1da177e4 | 802 | |
92fc65a7 PS |
803 | tcon = tlink_tcon(cifsFile->tlink); |
804 | rc = find_cifs_entry(xid, tcon, file, ¤t_entry, | |
805 | &num_to_fill); | |
790fe579 | 806 | if (rc) { |
b6b38f70 | 807 | cFYI(1, "fce error %d", rc); |
1da177e4 LT |
808 | goto rddir2_exit; |
809 | } else if (current_entry != NULL) { | |
b6b38f70 | 810 | cFYI(1, "entry %lld found", file->f_pos); |
1da177e4 | 811 | } else { |
b6b38f70 | 812 | cFYI(1, "could not find entry"); |
1da177e4 LT |
813 | goto rddir2_exit; |
814 | } | |
b6b38f70 JP |
815 | cFYI(1, "loop through %d times filling dir for net buf %p", |
816 | num_to_fill, cifsFile->srch_inf.ntwrk_buf_start); | |
92fc65a7 | 817 | max_len = tcon->ses->server->ops->calc_smb_size( |
5bafd765 SF |
818 | cifsFile->srch_inf.ntwrk_buf_start); |
819 | end_of_smb = cifsFile->srch_inf.ntwrk_buf_start + max_len; | |
820 | ||
f5884166 | 821 | tmp_buf = kmalloc(UNICODE_NAME_MAX, GFP_KERNEL); |
f55fdcca KV |
822 | if (tmp_buf == NULL) { |
823 | rc = -ENOMEM; | |
824 | break; | |
825 | } | |
826 | ||
790fe579 SF |
827 | for (i = 0; (i < num_to_fill) && (rc == 0); i++) { |
828 | if (current_entry == NULL) { | |
1da177e4 | 829 | /* evaluate whether this case is an error */ |
b6b38f70 JP |
830 | cERROR(1, "past SMB end, num to fill %d i %d", |
831 | num_to_fill, i); | |
1da177e4 LT |
832 | break; |
833 | } | |
92fc65a7 PS |
834 | /* |
835 | * if buggy server returns . and .. late do we want to | |
836 | * check for that here? | |
837 | */ | |
838 | rc = cifs_filldir(current_entry, file, filldir, | |
839 | direntry, tmp_buf, max_len); | |
790fe579 | 840 | if (rc == -EOVERFLOW) { |
7ca85ba7 SF |
841 | rc = 0; |
842 | break; | |
843 | } | |
844 | ||
1da177e4 | 845 | file->f_pos++; |
790fe579 | 846 | if (file->f_pos == |
3979877e | 847 | cifsFile->srch_inf.index_of_last_entry) { |
b6b38f70 JP |
848 | cFYI(1, "last entry in buf at pos %lld %s", |
849 | file->f_pos, tmp_buf); | |
790fe579 | 850 | cifs_save_resume_key(current_entry, cifsFile); |
1da177e4 | 851 | break; |
790fe579 SF |
852 | } else |
853 | current_entry = | |
5bafd765 SF |
854 | nxt_dir_entry(current_entry, end_of_smb, |
855 | cifsFile->srch_inf.info_level); | |
1da177e4 LT |
856 | } |
857 | kfree(tmp_buf); | |
858 | break; | |
859 | } /* end switch */ | |
860 | ||
861 | rddir2_exit: | |
6d5786a3 | 862 | free_xid(xid); |
1da177e4 LT |
863 | return rc; |
864 | } |