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Commit | Line | Data |
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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) { | |
cd60042c JL |
89 | inode = dentry->d_inode; |
90 | /* update inode in place if i_ino didn't change */ | |
91 | if (inode && CIFS_I(inode)->uniqueid == fattr->cf_uniqueid) { | |
92 | cifs_fattr_to_inode(inode, fattr); | |
cc0bad75 | 93 | return dentry; |
cd60042c | 94 | } |
cc0bad75 JL |
95 | d_drop(dentry); |
96 | dput(dentry); | |
97 | } | |
98 | ||
99 | dentry = d_alloc(parent, name); | |
100 | if (dentry == NULL) | |
101 | return NULL; | |
102 | ||
103 | inode = cifs_iget(sb, fattr); | |
104 | if (!inode) { | |
105 | dput(dentry); | |
106 | return NULL; | |
107 | } | |
108 | ||
cc0bad75 JL |
109 | alias = d_materialise_unique(dentry, inode); |
110 | if (alias != NULL) { | |
111 | dput(dentry); | |
112 | if (IS_ERR(alias)) | |
113 | return NULL; | |
114 | dentry = alias; | |
115 | } | |
116 | ||
117 | return dentry; | |
118 | } | |
119 | ||
0b8f18e3 JL |
120 | static void |
121 | cifs_fill_common_info(struct cifs_fattr *fattr, struct cifs_sb_info *cifs_sb) | |
1da177e4 | 122 | { |
0b8f18e3 JL |
123 | fattr->cf_uid = cifs_sb->mnt_uid; |
124 | fattr->cf_gid = cifs_sb->mnt_gid; | |
1da177e4 | 125 | |
0b8f18e3 JL |
126 | if (fattr->cf_cifsattrs & ATTR_DIRECTORY) { |
127 | fattr->cf_mode = S_IFDIR | cifs_sb->mnt_dir_mode; | |
128 | fattr->cf_dtype = DT_DIR; | |
1da177e4 | 129 | } else { |
0b8f18e3 JL |
130 | fattr->cf_mode = S_IFREG | cifs_sb->mnt_file_mode; |
131 | fattr->cf_dtype = DT_REG; | |
1da177e4 LT |
132 | } |
133 | ||
0b8f18e3 JL |
134 | if (fattr->cf_cifsattrs & ATTR_READONLY) |
135 | fattr->cf_mode &= ~S_IWUGO; | |
5bafd765 | 136 | |
0b8f18e3 JL |
137 | if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_UNX_EMUL && |
138 | fattr->cf_cifsattrs & ATTR_SYSTEM) { | |
139 | if (fattr->cf_eof == 0) { | |
140 | fattr->cf_mode &= ~S_IFMT; | |
141 | fattr->cf_mode |= S_IFIFO; | |
142 | fattr->cf_dtype = DT_FIFO; | |
3020a1f5 | 143 | } else { |
4468eb3f | 144 | /* |
0b8f18e3 JL |
145 | * trying to get the type and mode via SFU can be slow, |
146 | * so just call those regular files for now, and mark | |
147 | * for reval | |
4468eb3f | 148 | */ |
0b8f18e3 | 149 | fattr->cf_flags |= CIFS_FATTR_NEED_REVAL; |
4468eb3f JL |
150 | } |
151 | } | |
0b8f18e3 | 152 | } |
1da177e4 | 153 | |
15dd4781 | 154 | static void |
0b8f18e3 JL |
155 | cifs_dir_info_to_fattr(struct cifs_fattr *fattr, FILE_DIRECTORY_INFO *info, |
156 | struct cifs_sb_info *cifs_sb) | |
157 | { | |
158 | memset(fattr, 0, sizeof(*fattr)); | |
159 | fattr->cf_cifsattrs = le32_to_cpu(info->ExtFileAttributes); | |
160 | fattr->cf_eof = le64_to_cpu(info->EndOfFile); | |
161 | fattr->cf_bytes = le64_to_cpu(info->AllocationSize); | |
20054bd6 | 162 | fattr->cf_createtime = le64_to_cpu(info->CreationTime); |
0b8f18e3 JL |
163 | fattr->cf_atime = cifs_NTtimeToUnix(info->LastAccessTime); |
164 | fattr->cf_ctime = cifs_NTtimeToUnix(info->ChangeTime); | |
165 | fattr->cf_mtime = cifs_NTtimeToUnix(info->LastWriteTime); | |
166 | ||
167 | cifs_fill_common_info(fattr, cifs_sb); | |
168 | } | |
1da177e4 | 169 | |
15dd4781 | 170 | static void |
0b8f18e3 JL |
171 | cifs_std_info_to_fattr(struct cifs_fattr *fattr, FIND_FILE_STANDARD_INFO *info, |
172 | struct cifs_sb_info *cifs_sb) | |
173 | { | |
0d424ad0 | 174 | int offset = cifs_sb_master_tcon(cifs_sb)->ses->server->timeAdj; |
1da177e4 | 175 | |
0b8f18e3 JL |
176 | memset(fattr, 0, sizeof(*fattr)); |
177 | fattr->cf_atime = cnvrtDosUnixTm(info->LastAccessDate, | |
178 | info->LastAccessTime, offset); | |
179 | fattr->cf_ctime = cnvrtDosUnixTm(info->LastWriteDate, | |
180 | info->LastWriteTime, offset); | |
181 | fattr->cf_mtime = cnvrtDosUnixTm(info->LastWriteDate, | |
182 | info->LastWriteTime, offset); | |
183 | ||
184 | fattr->cf_cifsattrs = le16_to_cpu(info->Attributes); | |
185 | fattr->cf_bytes = le32_to_cpu(info->AllocationSize); | |
186 | fattr->cf_eof = le32_to_cpu(info->DataSize); | |
187 | ||
188 | cifs_fill_common_info(fattr, cifs_sb); | |
1da177e4 LT |
189 | } |
190 | ||
0e0d2cf3 SF |
191 | /* BB eventually need to add the following helper function to |
192 | resolve NT_STATUS_STOPPED_ON_SYMLINK return code when | |
193 | we try to do FindFirst on (NTFS) directory symlinks */ | |
194 | /* | |
195 | int get_symlink_reparse_path(char *full_path, struct cifs_sb_info *cifs_sb, | |
6d5786a3 | 196 | unsigned int xid) |
0e0d2cf3 SF |
197 | { |
198 | __u16 fid; | |
199 | int len; | |
200 | int oplock = 0; | |
201 | int rc; | |
96daf2b0 | 202 | struct cifs_tcon *ptcon = cifs_sb_tcon(cifs_sb); |
0e0d2cf3 SF |
203 | char *tmpbuffer; |
204 | ||
205 | rc = CIFSSMBOpen(xid, ptcon, full_path, FILE_OPEN, GENERIC_READ, | |
206 | OPEN_REPARSE_POINT, &fid, &oplock, NULL, | |
207 | cifs_sb->local_nls, | |
208 | cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR); | |
209 | if (!rc) { | |
210 | tmpbuffer = kmalloc(maxpath); | |
211 | rc = CIFSSMBQueryReparseLinkInfo(xid, ptcon, full_path, | |
212 | tmpbuffer, | |
213 | maxpath -1, | |
214 | fid, | |
215 | cifs_sb->local_nls); | |
216 | if (CIFSSMBClose(xid, ptcon, fid)) { | |
b6b38f70 | 217 | cFYI(1, "Error closing temporary reparsepoint open"); |
0e0d2cf3 SF |
218 | } |
219 | } | |
220 | } | |
221 | */ | |
222 | ||
6d5786a3 | 223 | static int initiate_cifs_search(const unsigned int xid, struct file *file) |
1da177e4 | 224 | { |
2608bee7 | 225 | __u16 search_flags; |
1da177e4 | 226 | int rc = 0; |
7ffec372 | 227 | char *full_path = NULL; |
3870253e | 228 | struct cifsFileInfo *cifsFile; |
7ffec372 | 229 | struct cifs_sb_info *cifs_sb = CIFS_SB(file->f_path.dentry->d_sb); |
59c55ba1 | 230 | struct tcon_link *tlink = NULL; |
29e20f9c | 231 | struct cifs_tcon *tcon; |
1da177e4 | 232 | |
7ffec372 | 233 | if (file->private_data == NULL) { |
59c55ba1 JL |
234 | tlink = cifs_sb_tlink(cifs_sb); |
235 | if (IS_ERR(tlink)) | |
236 | return PTR_ERR(tlink); | |
237 | ||
238 | cifsFile = kzalloc(sizeof(struct cifsFileInfo), GFP_KERNEL); | |
239 | if (cifsFile == NULL) { | |
240 | rc = -ENOMEM; | |
241 | goto error_exit; | |
242 | } | |
243 | file->private_data = cifsFile; | |
244 | cifsFile->tlink = cifs_get_tlink(tlink); | |
29e20f9c | 245 | tcon = tlink_tcon(tlink); |
59c55ba1 JL |
246 | } else { |
247 | cifsFile = file->private_data; | |
29e20f9c | 248 | tcon = tlink_tcon(cifsFile->tlink); |
7ffec372 | 249 | } |
1da177e4 | 250 | |
4b18f2a9 SF |
251 | cifsFile->invalidHandle = true; |
252 | cifsFile->srch_inf.endOfSearch = false; | |
1da177e4 | 253 | |
e6a00296 | 254 | full_path = build_path_from_dentry(file->f_path.dentry); |
7ffec372 JL |
255 | if (full_path == NULL) { |
256 | rc = -ENOMEM; | |
257 | goto error_exit; | |
258 | } | |
1da177e4 | 259 | |
b6b38f70 | 260 | cFYI(1, "Full path: %s start at: %lld", full_path, file->f_pos); |
1da177e4 | 261 | |
75cf6bdc | 262 | ffirst_retry: |
1da177e4 | 263 | /* test for Unix extensions */ |
c18c842b | 264 | /* but now check for them on the share/mount not on the SMB session */ |
29e20f9c PS |
265 | /* if (cap_unix(tcon->ses) { */ |
266 | if (tcon->unix_ext) | |
5bafd765 | 267 | cifsFile->srch_inf.info_level = SMB_FIND_FILE_UNIX; |
29e20f9c PS |
268 | else if ((tcon->ses->capabilities & |
269 | tcon->ses->server->vals->cap_nt_find) == 0) { | |
5bafd765 | 270 | cifsFile->srch_inf.info_level = SMB_FIND_FILE_INFO_STANDARD; |
1da177e4 LT |
271 | } else if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM) { |
272 | cifsFile->srch_inf.info_level = SMB_FIND_FILE_ID_FULL_DIR_INFO; | |
273 | } else /* not srvinos - BB fixme add check for backlevel? */ { | |
274 | cifsFile->srch_inf.info_level = SMB_FIND_FILE_DIRECTORY_INFO; | |
275 | } | |
276 | ||
2608bee7 SP |
277 | search_flags = CIFS_SEARCH_CLOSE_AT_END | CIFS_SEARCH_RETURN_RESUME; |
278 | if (backup_cred(cifs_sb)) | |
279 | search_flags |= CIFS_SEARCH_BACKUP_SEARCH; | |
280 | ||
29e20f9c | 281 | rc = CIFSFindFirst(xid, tcon, full_path, cifs_sb->local_nls, |
2608bee7 | 282 | &cifsFile->netfid, search_flags, &cifsFile->srch_inf, |
3870253e | 283 | cifs_sb->mnt_cifs_flags & |
eafe8701 | 284 | CIFS_MOUNT_MAP_SPECIAL_CHR, CIFS_DIR_SEP(cifs_sb)); |
4523cc30 | 285 | if (rc == 0) |
4b18f2a9 | 286 | cifsFile->invalidHandle = false; |
e836f015 | 287 | /* BB add following call to handle readdir on new NTFS symlink errors |
0e0d2cf3 SF |
288 | else if STATUS_STOPPED_ON_SYMLINK |
289 | call get_symlink_reparse_path and retry with new path */ | |
290 | else if ((rc == -EOPNOTSUPP) && | |
75cf6bdc SF |
291 | (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM)) { |
292 | cifs_sb->mnt_cifs_flags &= ~CIFS_MOUNT_SERVER_INUM; | |
293 | goto ffirst_retry; | |
294 | } | |
7ffec372 | 295 | error_exit: |
1da177e4 | 296 | kfree(full_path); |
7ffec372 | 297 | cifs_put_tlink(tlink); |
1da177e4 LT |
298 | return rc; |
299 | } | |
300 | ||
301 | /* return length of unicode string in bytes */ | |
cda0ec6a | 302 | static int cifs_unicode_bytelen(const char *str) |
1da177e4 LT |
303 | { |
304 | int len; | |
cda0ec6a | 305 | const __le16 *ustr = (const __le16 *)str; |
1da177e4 | 306 | |
3870253e | 307 | for (len = 0; len <= PATH_MAX; len++) { |
4523cc30 | 308 | if (ustr[len] == 0) |
1da177e4 LT |
309 | return len << 1; |
310 | } | |
b6b38f70 | 311 | cFYI(1, "Unicode string longer than PATH_MAX found"); |
1da177e4 LT |
312 | return len << 1; |
313 | } | |
314 | ||
5bafd765 | 315 | static char *nxt_dir_entry(char *old_entry, char *end_of_smb, int level) |
1da177e4 | 316 | { |
3870253e | 317 | char *new_entry; |
ad7a2926 | 318 | FILE_DIRECTORY_INFO *pDirInfo = (FILE_DIRECTORY_INFO *)old_entry; |
1da177e4 | 319 | |
4523cc30 | 320 | if (level == SMB_FIND_FILE_INFO_STANDARD) { |
ad7a2926 | 321 | FIND_FILE_STANDARD_INFO *pfData; |
5bafd765 SF |
322 | pfData = (FIND_FILE_STANDARD_INFO *)pDirInfo; |
323 | ||
324 | new_entry = old_entry + sizeof(FIND_FILE_STANDARD_INFO) + | |
325 | pfData->FileNameLength; | |
326 | } else | |
327 | new_entry = old_entry + le32_to_cpu(pDirInfo->NextEntryOffset); | |
b6b38f70 | 328 | cFYI(1, "new entry %p old entry %p", new_entry, old_entry); |
1da177e4 | 329 | /* validate that new_entry is not past end of SMB */ |
4523cc30 | 330 | if (new_entry >= end_of_smb) { |
b6b38f70 JP |
331 | cERROR(1, "search entry %p began after end of SMB %p old entry %p", |
332 | new_entry, end_of_smb, old_entry); | |
1da177e4 | 333 | return NULL; |
4523cc30 | 334 | } else if (((level == SMB_FIND_FILE_INFO_STANDARD) && |
3870253e SF |
335 | (new_entry + sizeof(FIND_FILE_STANDARD_INFO) > end_of_smb)) |
336 | || ((level != SMB_FIND_FILE_INFO_STANDARD) && | |
5bafd765 | 337 | (new_entry + sizeof(FILE_DIRECTORY_INFO) > end_of_smb))) { |
b6b38f70 JP |
338 | cERROR(1, "search entry %p extends after end of SMB %p", |
339 | new_entry, end_of_smb); | |
09d1db5c | 340 | return NULL; |
3870253e | 341 | } else |
1da177e4 LT |
342 | return new_entry; |
343 | ||
344 | } | |
345 | ||
cda0ec6a CH |
346 | struct cifs_dirent { |
347 | const char *name; | |
348 | size_t namelen; | |
349 | u32 resume_key; | |
350 | u64 ino; | |
351 | }; | |
352 | ||
353 | static void cifs_fill_dirent_unix(struct cifs_dirent *de, | |
354 | const FILE_UNIX_INFO *info, bool is_unicode) | |
355 | { | |
356 | de->name = &info->FileName[0]; | |
357 | if (is_unicode) | |
358 | de->namelen = cifs_unicode_bytelen(de->name); | |
359 | else | |
360 | de->namelen = strnlen(de->name, PATH_MAX); | |
361 | de->resume_key = info->ResumeKey; | |
362 | de->ino = le64_to_cpu(info->basic.UniqueId); | |
363 | } | |
364 | ||
365 | static void cifs_fill_dirent_dir(struct cifs_dirent *de, | |
366 | const FILE_DIRECTORY_INFO *info) | |
367 | { | |
368 | de->name = &info->FileName[0]; | |
369 | de->namelen = le32_to_cpu(info->FileNameLength); | |
370 | de->resume_key = info->FileIndex; | |
371 | } | |
372 | ||
373 | static void cifs_fill_dirent_full(struct cifs_dirent *de, | |
374 | const FILE_FULL_DIRECTORY_INFO *info) | |
375 | { | |
376 | de->name = &info->FileName[0]; | |
377 | de->namelen = le32_to_cpu(info->FileNameLength); | |
378 | de->resume_key = info->FileIndex; | |
379 | } | |
380 | ||
381 | static void cifs_fill_dirent_search(struct cifs_dirent *de, | |
382 | const SEARCH_ID_FULL_DIR_INFO *info) | |
383 | { | |
384 | de->name = &info->FileName[0]; | |
385 | de->namelen = le32_to_cpu(info->FileNameLength); | |
386 | de->resume_key = info->FileIndex; | |
387 | de->ino = le64_to_cpu(info->UniqueId); | |
388 | } | |
389 | ||
390 | static void cifs_fill_dirent_both(struct cifs_dirent *de, | |
391 | const FILE_BOTH_DIRECTORY_INFO *info) | |
392 | { | |
393 | de->name = &info->FileName[0]; | |
394 | de->namelen = le32_to_cpu(info->FileNameLength); | |
395 | de->resume_key = info->FileIndex; | |
396 | } | |
397 | ||
398 | static void cifs_fill_dirent_std(struct cifs_dirent *de, | |
399 | const FIND_FILE_STANDARD_INFO *info) | |
400 | { | |
401 | de->name = &info->FileName[0]; | |
402 | /* one byte length, no endianess conversion */ | |
403 | de->namelen = info->FileNameLength; | |
404 | de->resume_key = info->ResumeKey; | |
405 | } | |
406 | ||
407 | static int cifs_fill_dirent(struct cifs_dirent *de, const void *info, | |
408 | u16 level, bool is_unicode) | |
409 | { | |
410 | memset(de, 0, sizeof(*de)); | |
411 | ||
412 | switch (level) { | |
413 | case SMB_FIND_FILE_UNIX: | |
414 | cifs_fill_dirent_unix(de, info, is_unicode); | |
415 | break; | |
416 | case SMB_FIND_FILE_DIRECTORY_INFO: | |
417 | cifs_fill_dirent_dir(de, info); | |
418 | break; | |
419 | case SMB_FIND_FILE_FULL_DIRECTORY_INFO: | |
420 | cifs_fill_dirent_full(de, info); | |
421 | break; | |
422 | case SMB_FIND_FILE_ID_FULL_DIR_INFO: | |
423 | cifs_fill_dirent_search(de, info); | |
424 | break; | |
425 | case SMB_FIND_FILE_BOTH_DIRECTORY_INFO: | |
426 | cifs_fill_dirent_both(de, info); | |
427 | break; | |
428 | case SMB_FIND_FILE_INFO_STANDARD: | |
429 | cifs_fill_dirent_std(de, info); | |
430 | break; | |
431 | default: | |
432 | cFYI(1, "Unknown findfirst level %d", level); | |
433 | return -EINVAL; | |
434 | } | |
435 | ||
436 | return 0; | |
437 | } | |
438 | ||
1da177e4 LT |
439 | #define UNICODE_DOT cpu_to_le16(0x2e) |
440 | ||
441 | /* return 0 if no match and 1 for . (current directory) and 2 for .. (parent) */ | |
cda0ec6a | 442 | static int cifs_entry_is_dot(struct cifs_dirent *de, bool is_unicode) |
1da177e4 LT |
443 | { |
444 | int rc = 0; | |
1da177e4 | 445 | |
cda0ec6a CH |
446 | if (!de->name) |
447 | return 0; | |
1da177e4 | 448 | |
cda0ec6a CH |
449 | if (is_unicode) { |
450 | __le16 *ufilename = (__le16 *)de->name; | |
451 | if (de->namelen == 2) { | |
452 | /* check for . */ | |
453 | if (ufilename[0] == UNICODE_DOT) | |
454 | rc = 1; | |
455 | } else if (de->namelen == 4) { | |
456 | /* check for .. */ | |
457 | if (ufilename[0] == UNICODE_DOT && | |
458 | ufilename[1] == UNICODE_DOT) | |
459 | rc = 2; | |
460 | } | |
461 | } else /* ASCII */ { | |
462 | if (de->namelen == 1) { | |
463 | if (de->name[0] == '.') | |
464 | rc = 1; | |
465 | } else if (de->namelen == 2) { | |
466 | if (de->name[0] == '.' && de->name[1] == '.') | |
467 | rc = 2; | |
1da177e4 LT |
468 | } |
469 | } | |
470 | ||
471 | return rc; | |
472 | } | |
473 | ||
eafe8701 SF |
474 | /* Check if directory that we are searching has changed so we can decide |
475 | whether we can use the cached search results from the previous search */ | |
3870253e | 476 | static int is_dir_changed(struct file *file) |
eafe8701 | 477 | { |
c33f8d32 CH |
478 | struct inode *inode = file->f_path.dentry->d_inode; |
479 | struct cifsInodeInfo *cifsInfo = CIFS_I(inode); | |
eafe8701 | 480 | |
c33f8d32 | 481 | if (cifsInfo->time == 0) |
eafe8701 SF |
482 | return 1; /* directory was changed, perhaps due to unlink */ |
483 | else | |
484 | return 0; | |
485 | ||
486 | } | |
487 | ||
0752f152 | 488 | static int cifs_save_resume_key(const char *current_entry, |
eaf35b1e | 489 | struct cifsFileInfo *file_info) |
0752f152 | 490 | { |
eaf35b1e CH |
491 | struct cifs_dirent de; |
492 | int rc; | |
0752f152 | 493 | |
eaf35b1e CH |
494 | rc = cifs_fill_dirent(&de, current_entry, file_info->srch_inf.info_level, |
495 | file_info->srch_inf.unicode); | |
496 | if (!rc) { | |
497 | file_info->srch_inf.presume_name = de.name; | |
498 | file_info->srch_inf.resume_name_len = de.namelen; | |
499 | file_info->srch_inf.resume_key = de.resume_key; | |
0752f152 | 500 | } |
0752f152 SF |
501 | return rc; |
502 | } | |
503 | ||
1da177e4 LT |
504 | /* find the corresponding entry in the search */ |
505 | /* Note that the SMB server returns search entries for . and .. which | |
506 | complicates logic here if we choose to parse for them and we do not | |
507 | assume that they are located in the findfirst return buffer.*/ | |
508 | /* We start counting in the buffer with entry 2 and increment for every | |
509 | entry (do not increment for . or .. entry) */ | |
6d5786a3 | 510 | static int find_cifs_entry(const unsigned int xid, struct cifs_tcon *pTcon, |
3870253e | 511 | struct file *file, char **ppCurrentEntry, int *num_to_ret) |
1da177e4 | 512 | { |
2608bee7 | 513 | __u16 search_flags; |
1da177e4 LT |
514 | int rc = 0; |
515 | int pos_in_buf = 0; | |
516 | loff_t first_entry_in_buffer; | |
517 | loff_t index_to_find = file->f_pos; | |
3870253e | 518 | struct cifsFileInfo *cifsFile = file->private_data; |
2608bee7 | 519 | struct cifs_sb_info *cifs_sb = CIFS_SB(file->f_path.dentry->d_sb); |
1da177e4 | 520 | /* check if index in the buffer */ |
50c2f753 | 521 | |
3870253e | 522 | if ((cifsFile == NULL) || (ppCurrentEntry == NULL) || |
eafe8701 | 523 | (num_to_ret == NULL)) |
1da177e4 | 524 | return -ENOENT; |
50c2f753 | 525 | |
1da177e4 | 526 | *ppCurrentEntry = NULL; |
3870253e SF |
527 | first_entry_in_buffer = |
528 | cifsFile->srch_inf.index_of_last_entry - | |
1da177e4 | 529 | cifsFile->srch_inf.entries_in_buffer; |
60808233 SF |
530 | |
531 | /* if first entry in buf is zero then is first buffer | |
532 | in search response data which means it is likely . and .. | |
533 | will be in this buffer, although some servers do not return | |
534 | . and .. for the root of a drive and for those we need | |
535 | to start two entries earlier */ | |
536 | ||
3979877e | 537 | dump_cifs_file_struct(file, "In fce "); |
3870253e SF |
538 | if (((index_to_find < cifsFile->srch_inf.index_of_last_entry) && |
539 | is_dir_changed(file)) || | |
eafe8701 | 540 | (index_to_find < first_entry_in_buffer)) { |
1da177e4 | 541 | /* close and restart search */ |
b6b38f70 | 542 | cFYI(1, "search backing up - close and restart search"); |
4477288a | 543 | spin_lock(&cifs_file_list_lock); |
77c57ec8 SF |
544 | if (!cifsFile->srch_inf.endOfSearch && |
545 | !cifsFile->invalidHandle) { | |
546 | cifsFile->invalidHandle = true; | |
4477288a | 547 | spin_unlock(&cifs_file_list_lock); |
77c57ec8 | 548 | CIFSFindClose(xid, pTcon, cifsFile->netfid); |
ddb4cbfc | 549 | } else |
4477288a | 550 | spin_unlock(&cifs_file_list_lock); |
4523cc30 | 551 | if (cifsFile->srch_inf.ntwrk_buf_start) { |
b6b38f70 | 552 | cFYI(1, "freeing SMB ff cache buf on search rewind"); |
4523cc30 | 553 | if (cifsFile->srch_inf.smallBuf) |
d47d7c1a SF |
554 | cifs_small_buf_release(cifsFile->srch_inf. |
555 | ntwrk_buf_start); | |
556 | else | |
557 | cifs_buf_release(cifsFile->srch_inf. | |
558 | ntwrk_buf_start); | |
76c510ad | 559 | cifsFile->srch_inf.ntwrk_buf_start = NULL; |
1da177e4 | 560 | } |
3870253e | 561 | rc = initiate_cifs_search(xid, file); |
4523cc30 | 562 | if (rc) { |
b6b38f70 JP |
563 | cFYI(1, "error %d reinitiating a search on rewind", |
564 | rc); | |
1da177e4 LT |
565 | return rc; |
566 | } | |
7023676f JL |
567 | /* FindFirst/Next set last_entry to NULL on malformed reply */ |
568 | if (cifsFile->srch_inf.last_entry) | |
569 | cifs_save_resume_key(cifsFile->srch_inf.last_entry, | |
570 | cifsFile); | |
1da177e4 LT |
571 | } |
572 | ||
2608bee7 SP |
573 | search_flags = CIFS_SEARCH_CLOSE_AT_END | CIFS_SEARCH_RETURN_RESUME; |
574 | if (backup_cred(cifs_sb)) | |
575 | search_flags |= CIFS_SEARCH_BACKUP_SEARCH; | |
576 | ||
3870253e | 577 | while ((index_to_find >= cifsFile->srch_inf.index_of_last_entry) && |
4b18f2a9 | 578 | (rc == 0) && !cifsFile->srch_inf.endOfSearch) { |
b6b38f70 | 579 | cFYI(1, "calling findnext2"); |
2608bee7 | 580 | rc = CIFSFindNext(xid, pTcon, cifsFile->netfid, search_flags, |
dfb7533b | 581 | &cifsFile->srch_inf); |
7023676f JL |
582 | /* FindFirst/Next set last_entry to NULL on malformed reply */ |
583 | if (cifsFile->srch_inf.last_entry) | |
584 | cifs_save_resume_key(cifsFile->srch_inf.last_entry, | |
585 | cifsFile); | |
4523cc30 | 586 | if (rc) |
1da177e4 LT |
587 | return -ENOENT; |
588 | } | |
4523cc30 | 589 | if (index_to_find < cifsFile->srch_inf.index_of_last_entry) { |
1da177e4 LT |
590 | /* we found the buffer that contains the entry */ |
591 | /* scan and find it */ | |
592 | int i; | |
3870253e SF |
593 | char *current_entry; |
594 | char *end_of_smb = cifsFile->srch_inf.ntwrk_buf_start + | |
1da177e4 LT |
595 | smbCalcSize((struct smb_hdr *) |
596 | cifsFile->srch_inf.ntwrk_buf_start); | |
60808233 SF |
597 | |
598 | current_entry = cifsFile->srch_inf.srch_entries_start; | |
1da177e4 LT |
599 | first_entry_in_buffer = cifsFile->srch_inf.index_of_last_entry |
600 | - cifsFile->srch_inf.entries_in_buffer; | |
601 | pos_in_buf = index_to_find - first_entry_in_buffer; | |
b6b38f70 | 602 | cFYI(1, "found entry - pos_in_buf %d", pos_in_buf); |
5bafd765 | 603 | |
ad7a2926 | 604 | for (i = 0; (i < (pos_in_buf)) && (current_entry != NULL); i++) { |
dfb7533b | 605 | /* go entry by entry figuring out which is first */ |
3870253e | 606 | current_entry = nxt_dir_entry(current_entry, end_of_smb, |
5bafd765 | 607 | cifsFile->srch_inf.info_level); |
1da177e4 | 608 | } |
790fe579 | 609 | if ((current_entry == NULL) && (i < pos_in_buf)) { |
1da177e4 | 610 | /* BB fixme - check if we should flag this error */ |
b6b38f70 | 611 | cERROR(1, "reached end of buf searching for pos in buf" |
1da177e4 | 612 | " %d index to find %lld rc %d", |
b6b38f70 | 613 | pos_in_buf, index_to_find, rc); |
1da177e4 LT |
614 | } |
615 | rc = 0; | |
616 | *ppCurrentEntry = current_entry; | |
617 | } else { | |
b6b38f70 | 618 | cFYI(1, "index not in buffer - could not findnext into it"); |
1da177e4 LT |
619 | return 0; |
620 | } | |
621 | ||
790fe579 | 622 | if (pos_in_buf >= cifsFile->srch_inf.entries_in_buffer) { |
b6b38f70 | 623 | cFYI(1, "can not return entries pos_in_buf beyond last"); |
1da177e4 LT |
624 | *num_to_ret = 0; |
625 | } else | |
626 | *num_to_ret = cifsFile->srch_inf.entries_in_buffer - pos_in_buf; | |
1da177e4 LT |
627 | |
628 | return rc; | |
629 | } | |
630 | ||
9feed6f8 CH |
631 | static int cifs_filldir(char *find_entry, struct file *file, filldir_t filldir, |
632 | void *dirent, char *scratch_buf, unsigned int max_len) | |
1da177e4 | 633 | { |
9feed6f8 CH |
634 | struct cifsFileInfo *file_info = file->private_data; |
635 | struct super_block *sb = file->f_path.dentry->d_sb; | |
636 | struct cifs_sb_info *cifs_sb = CIFS_SB(sb); | |
cda0ec6a | 637 | struct cifs_dirent de = { NULL, }; |
cc0bad75 | 638 | struct cifs_fattr fattr; |
9feed6f8 CH |
639 | struct dentry *dentry; |
640 | struct qstr name; | |
1da177e4 | 641 | int rc = 0; |
9feed6f8 | 642 | ino_t ino; |
1da177e4 | 643 | |
cda0ec6a CH |
644 | rc = cifs_fill_dirent(&de, find_entry, file_info->srch_inf.info_level, |
645 | file_info->srch_inf.unicode); | |
646 | if (rc) | |
647 | return rc; | |
5bafd765 | 648 | |
f16d59b4 CH |
649 | if (de.namelen > max_len) { |
650 | cERROR(1, "bad search response length %zd past smb end", | |
651 | de.namelen); | |
5bafd765 SF |
652 | return -EINVAL; |
653 | } | |
654 | ||
60808233 | 655 | /* skip . and .. since we added them first */ |
cda0ec6a | 656 | if (cifs_entry_is_dot(&de, file_info->srch_inf.unicode)) |
60808233 SF |
657 | return 0; |
658 | ||
f16d59b4 CH |
659 | if (file_info->srch_inf.unicode) { |
660 | struct nls_table *nlt = cifs_sb->local_nls; | |
1da177e4 | 661 | |
f16d59b4 CH |
662 | name.name = scratch_buf; |
663 | name.len = | |
acbbb76a SF |
664 | cifs_from_utf16((char *)name.name, (__le16 *)de.name, |
665 | UNICODE_NAME_MAX, | |
666 | min_t(size_t, de.namelen, | |
667 | (size_t)max_len), nlt, | |
668 | cifs_sb->mnt_cifs_flags & | |
f16d59b4 CH |
669 | CIFS_MOUNT_MAP_SPECIAL_CHR); |
670 | name.len -= nls_nullsize(nlt); | |
671 | } else { | |
672 | name.name = de.name; | |
673 | name.len = de.namelen; | |
674 | } | |
1da177e4 | 675 | |
9feed6f8 CH |
676 | switch (file_info->srch_inf.info_level) { |
677 | case SMB_FIND_FILE_UNIX: | |
cc0bad75 | 678 | cifs_unix_basic_to_fattr(&fattr, |
9feed6f8 CH |
679 | &((FILE_UNIX_INFO *)find_entry)->basic, |
680 | cifs_sb); | |
681 | break; | |
682 | case SMB_FIND_FILE_INFO_STANDARD: | |
683 | cifs_std_info_to_fattr(&fattr, | |
684 | (FIND_FILE_STANDARD_INFO *)find_entry, | |
685 | cifs_sb); | |
686 | break; | |
687 | default: | |
688 | cifs_dir_info_to_fattr(&fattr, | |
689 | (FILE_DIRECTORY_INFO *)find_entry, | |
690 | cifs_sb); | |
691 | break; | |
692 | } | |
b835bebe | 693 | |
f16d59b4 CH |
694 | if (de.ino && (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM)) { |
695 | fattr.cf_uniqueid = de.ino; | |
ec06aedd | 696 | } else { |
0b8f18e3 | 697 | fattr.cf_uniqueid = iunique(sb, ROOT_I); |
ec06aedd JL |
698 | cifs_autodisable_serverino(cifs_sb); |
699 | } | |
50c2f753 | 700 | |
1b12b9c1 SM |
701 | if ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MF_SYMLINKS) && |
702 | CIFSCouldBeMFSymlink(&fattr)) | |
703 | /* | |
704 | * trying to get the type and mode can be slow, | |
705 | * so just call those regular files for now, and mark | |
706 | * for reval | |
707 | */ | |
708 | fattr.cf_flags |= CIFS_FATTR_NEED_REVAL; | |
709 | ||
0b8f18e3 | 710 | ino = cifs_uniqueid_to_ino_t(fattr.cf_uniqueid); |
9feed6f8 | 711 | dentry = cifs_readdir_lookup(file->f_dentry, &name, &fattr); |
3870253e | 712 | |
9feed6f8 CH |
713 | rc = filldir(dirent, name.name, name.len, file->f_pos, ino, |
714 | fattr.cf_dtype); | |
0b8f18e3 | 715 | |
9feed6f8 | 716 | dput(dentry); |
1da177e4 LT |
717 | return rc; |
718 | } | |
719 | ||
1da177e4 LT |
720 | |
721 | int cifs_readdir(struct file *file, void *direntry, filldir_t filldir) | |
722 | { | |
723 | int rc = 0; | |
6d5786a3 PS |
724 | unsigned int xid; |
725 | int i; | |
96daf2b0 | 726 | struct cifs_tcon *pTcon; |
1da177e4 | 727 | struct cifsFileInfo *cifsFile = NULL; |
3870253e | 728 | char *current_entry; |
1da177e4 | 729 | int num_to_fill = 0; |
3870253e | 730 | char *tmp_buf = NULL; |
50c2f753 | 731 | char *end_of_smb; |
18295796 | 732 | unsigned int max_len; |
1da177e4 | 733 | |
6d5786a3 | 734 | xid = get_xid(); |
1da177e4 | 735 | |
6221ddd0 SJ |
736 | /* |
737 | * Ensure FindFirst doesn't fail before doing filldir() for '.' and | |
738 | * '..'. Otherwise we won't be able to notify VFS in case of failure. | |
739 | */ | |
740 | if (file->private_data == NULL) { | |
741 | rc = initiate_cifs_search(xid, file); | |
742 | cFYI(1, "initiate cifs search rc %d", rc); | |
743 | if (rc) | |
744 | goto rddir2_exit; | |
745 | } | |
746 | ||
1da177e4 LT |
747 | switch ((int) file->f_pos) { |
748 | case 0: | |
60808233 | 749 | if (filldir(direntry, ".", 1, file->f_pos, |
e6a00296 | 750 | file->f_path.dentry->d_inode->i_ino, DT_DIR) < 0) { |
b6b38f70 | 751 | cERROR(1, "Filldir for current dir failed"); |
1da177e4 LT |
752 | rc = -ENOMEM; |
753 | break; | |
754 | } | |
60808233 | 755 | file->f_pos++; |
1da177e4 | 756 | case 1: |
60808233 | 757 | if (filldir(direntry, "..", 2, file->f_pos, |
b85fd6bd | 758 | parent_ino(file->f_path.dentry), DT_DIR) < 0) { |
b6b38f70 | 759 | cERROR(1, "Filldir for parent dir failed"); |
1da177e4 LT |
760 | rc = -ENOMEM; |
761 | break; | |
762 | } | |
60808233 SF |
763 | file->f_pos++; |
764 | default: | |
3870253e SF |
765 | /* 1) If search is active, |
766 | is in current search buffer? | |
1da177e4 LT |
767 | if it before then restart search |
768 | if after then keep searching till find it */ | |
769 | ||
790fe579 | 770 | if (file->private_data == NULL) { |
1da177e4 | 771 | rc = -EINVAL; |
6d5786a3 | 772 | free_xid(xid); |
1da177e4 LT |
773 | return rc; |
774 | } | |
775 | cifsFile = file->private_data; | |
776 | if (cifsFile->srch_inf.endOfSearch) { | |
790fe579 | 777 | if (cifsFile->srch_inf.emptyDir) { |
b6b38f70 | 778 | cFYI(1, "End of search, empty dir"); |
1da177e4 LT |
779 | rc = 0; |
780 | break; | |
781 | } | |
782 | } /* else { | |
4b18f2a9 | 783 | cifsFile->invalidHandle = true; |
1da177e4 | 784 | CIFSFindClose(xid, pTcon, cifsFile->netfid); |
aaa9bbe0 | 785 | } */ |
1da177e4 | 786 | |
13cfb733 | 787 | pTcon = tlink_tcon(cifsFile->tlink); |
3870253e SF |
788 | rc = find_cifs_entry(xid, pTcon, file, |
789 | ¤t_entry, &num_to_fill); | |
790fe579 | 790 | if (rc) { |
b6b38f70 | 791 | cFYI(1, "fce error %d", rc); |
1da177e4 LT |
792 | goto rddir2_exit; |
793 | } else if (current_entry != NULL) { | |
b6b38f70 | 794 | cFYI(1, "entry %lld found", file->f_pos); |
1da177e4 | 795 | } else { |
b6b38f70 | 796 | cFYI(1, "could not find entry"); |
1da177e4 LT |
797 | goto rddir2_exit; |
798 | } | |
b6b38f70 JP |
799 | cFYI(1, "loop through %d times filling dir for net buf %p", |
800 | num_to_fill, cifsFile->srch_inf.ntwrk_buf_start); | |
5bafd765 SF |
801 | max_len = smbCalcSize((struct smb_hdr *) |
802 | cifsFile->srch_inf.ntwrk_buf_start); | |
803 | end_of_smb = cifsFile->srch_inf.ntwrk_buf_start + max_len; | |
804 | ||
f5884166 | 805 | tmp_buf = kmalloc(UNICODE_NAME_MAX, GFP_KERNEL); |
f55fdcca KV |
806 | if (tmp_buf == NULL) { |
807 | rc = -ENOMEM; | |
808 | break; | |
809 | } | |
810 | ||
790fe579 SF |
811 | for (i = 0; (i < num_to_fill) && (rc == 0); i++) { |
812 | if (current_entry == NULL) { | |
1da177e4 | 813 | /* evaluate whether this case is an error */ |
b6b38f70 JP |
814 | cERROR(1, "past SMB end, num to fill %d i %d", |
815 | num_to_fill, i); | |
1da177e4 LT |
816 | break; |
817 | } | |
60808233 SF |
818 | /* if buggy server returns . and .. late do |
819 | we want to check for that here? */ | |
5bafd765 SF |
820 | rc = cifs_filldir(current_entry, file, |
821 | filldir, direntry, tmp_buf, max_len); | |
790fe579 | 822 | if (rc == -EOVERFLOW) { |
7ca85ba7 SF |
823 | rc = 0; |
824 | break; | |
825 | } | |
826 | ||
1da177e4 | 827 | file->f_pos++; |
790fe579 | 828 | if (file->f_pos == |
3979877e | 829 | cifsFile->srch_inf.index_of_last_entry) { |
b6b38f70 JP |
830 | cFYI(1, "last entry in buf at pos %lld %s", |
831 | file->f_pos, tmp_buf); | |
790fe579 | 832 | cifs_save_resume_key(current_entry, cifsFile); |
1da177e4 | 833 | break; |
790fe579 SF |
834 | } else |
835 | current_entry = | |
5bafd765 SF |
836 | nxt_dir_entry(current_entry, end_of_smb, |
837 | cifsFile->srch_inf.info_level); | |
1da177e4 LT |
838 | } |
839 | kfree(tmp_buf); | |
840 | break; | |
841 | } /* end switch */ | |
842 | ||
843 | rddir2_exit: | |
6d5786a3 | 844 | free_xid(xid); |
1da177e4 LT |
845 | return rc; |
846 | } |