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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) { |
f96637be | 51 | cifs_dbg(FYI, "empty cifs private file data\n"); |
1da177e4 LT |
52 | return; |
53 | } | |
ad7a2926 | 54 | if (cf->invalidHandle) |
f96637be | 55 | cifs_dbg(FYI, "invalid handle\n"); |
ad7a2926 | 56 | if (cf->srch_inf.endOfSearch) |
f96637be | 57 | cifs_dbg(FYI, "end of search\n"); |
ad7a2926 | 58 | if (cf->srch_inf.emptyDir) |
f96637be | 59 | cifs_dbg(FYI, "empty dir\n"); |
1da177e4 | 60 | } |
3979877e | 61 | } |
90c81e0b SF |
62 | #else |
63 | static inline void dump_cifs_file_struct(struct file *file, char *label) | |
64 | { | |
65 | } | |
3979877e | 66 | #endif /* DEBUG2 */ |
1da177e4 | 67 | |
cc0bad75 | 68 | /* |
eb1b3fa5 JL |
69 | * Attempt to preload the dcache with the results from the FIND_FIRST/NEXT |
70 | * | |
cc0bad75 JL |
71 | * Find the dentry that matches "name". If there isn't one, create one. If it's |
72 | * a negative dentry or the uniqueid changed, then drop it and recreate it. | |
73 | */ | |
eb1b3fa5 JL |
74 | static void |
75 | cifs_prime_dcache(struct dentry *parent, struct qstr *name, | |
cc0bad75 JL |
76 | struct cifs_fattr *fattr) |
77 | { | |
78 | struct dentry *dentry, *alias; | |
79 | struct inode *inode; | |
80 | struct super_block *sb = parent->d_inode->i_sb; | |
2f2591a3 | 81 | struct cifs_sb_info *cifs_sb = CIFS_SB(sb); |
cc0bad75 | 82 | |
f96637be | 83 | cifs_dbg(FYI, "%s: for %s\n", __func__, name->name); |
cc0bad75 | 84 | |
4f522a24 AV |
85 | dentry = d_hash_and_lookup(parent, name); |
86 | if (unlikely(IS_ERR(dentry))) | |
87 | return; | |
05507fa2 | 88 | |
cc0bad75 | 89 | if (dentry) { |
0903a0c8 | 90 | int err; |
eb1b3fa5 | 91 | |
cd60042c | 92 | inode = dentry->d_inode; |
2f2591a3 JL |
93 | if (inode) { |
94 | /* | |
95 | * If we're generating inode numbers, then we don't | |
96 | * want to clobber the existing one with the one that | |
97 | * the readdir code created. | |
98 | */ | |
99 | if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM)) | |
100 | fattr->cf_uniqueid = CIFS_I(inode)->uniqueid; | |
101 | ||
102 | /* update inode in place if i_ino didn't change */ | |
103 | if (CIFS_I(inode)->uniqueid == fattr->cf_uniqueid) { | |
104 | cifs_fattr_to_inode(inode, fattr); | |
105 | goto out; | |
106 | } | |
cd60042c | 107 | } |
0903a0c8 | 108 | err = d_invalidate(dentry); |
cc0bad75 | 109 | dput(dentry); |
0903a0c8 | 110 | if (err) |
eb1b3fa5 | 111 | return; |
cc0bad75 JL |
112 | } |
113 | ||
114 | dentry = d_alloc(parent, name); | |
eb1b3fa5 JL |
115 | if (!dentry) |
116 | return; | |
cc0bad75 JL |
117 | |
118 | inode = cifs_iget(sb, fattr); | |
eb1b3fa5 JL |
119 | if (!inode) |
120 | goto out; | |
cc0bad75 | 121 | |
cc0bad75 | 122 | alias = d_materialise_unique(dentry, inode); |
eb1b3fa5 JL |
123 | if (alias && !IS_ERR(alias)) |
124 | dput(alias); | |
125 | out: | |
126 | dput(dentry); | |
cc0bad75 JL |
127 | } |
128 | ||
0b8f18e3 JL |
129 | static void |
130 | cifs_fill_common_info(struct cifs_fattr *fattr, struct cifs_sb_info *cifs_sb) | |
1da177e4 | 131 | { |
0b8f18e3 JL |
132 | fattr->cf_uid = cifs_sb->mnt_uid; |
133 | fattr->cf_gid = cifs_sb->mnt_gid; | |
1da177e4 | 134 | |
0b8f18e3 JL |
135 | if (fattr->cf_cifsattrs & ATTR_DIRECTORY) { |
136 | fattr->cf_mode = S_IFDIR | cifs_sb->mnt_dir_mode; | |
137 | fattr->cf_dtype = DT_DIR; | |
1da177e4 | 138 | } else { |
0b8f18e3 JL |
139 | fattr->cf_mode = S_IFREG | cifs_sb->mnt_file_mode; |
140 | fattr->cf_dtype = DT_REG; | |
1da177e4 LT |
141 | } |
142 | ||
0b8f18e3 JL |
143 | if (fattr->cf_cifsattrs & ATTR_READONLY) |
144 | fattr->cf_mode &= ~S_IWUGO; | |
5bafd765 | 145 | |
ccb5c001 JL |
146 | /* |
147 | * We of course don't get ACL info in FIND_FIRST/NEXT results, so | |
148 | * mark it for revalidation so that "ls -l" will look right. It might | |
149 | * be super-slow, but if we don't do this then the ownership of files | |
150 | * may look wrong since the inodes may not have timed out by the time | |
151 | * "ls" does a stat() call on them. | |
152 | */ | |
153 | if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_CIFS_ACL) | |
154 | fattr->cf_flags |= CIFS_FATTR_NEED_REVAL; | |
155 | ||
0b8f18e3 JL |
156 | if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_UNX_EMUL && |
157 | fattr->cf_cifsattrs & ATTR_SYSTEM) { | |
158 | if (fattr->cf_eof == 0) { | |
159 | fattr->cf_mode &= ~S_IFMT; | |
160 | fattr->cf_mode |= S_IFIFO; | |
161 | fattr->cf_dtype = DT_FIFO; | |
3020a1f5 | 162 | } else { |
4468eb3f | 163 | /* |
0b8f18e3 JL |
164 | * trying to get the type and mode via SFU can be slow, |
165 | * so just call those regular files for now, and mark | |
166 | * for reval | |
4468eb3f | 167 | */ |
0b8f18e3 | 168 | fattr->cf_flags |= CIFS_FATTR_NEED_REVAL; |
4468eb3f JL |
169 | } |
170 | } | |
0b8f18e3 | 171 | } |
1da177e4 | 172 | |
c052e2b4 | 173 | void |
0b8f18e3 JL |
174 | cifs_dir_info_to_fattr(struct cifs_fattr *fattr, FILE_DIRECTORY_INFO *info, |
175 | struct cifs_sb_info *cifs_sb) | |
176 | { | |
177 | memset(fattr, 0, sizeof(*fattr)); | |
178 | fattr->cf_cifsattrs = le32_to_cpu(info->ExtFileAttributes); | |
179 | fattr->cf_eof = le64_to_cpu(info->EndOfFile); | |
180 | fattr->cf_bytes = le64_to_cpu(info->AllocationSize); | |
20054bd6 | 181 | fattr->cf_createtime = le64_to_cpu(info->CreationTime); |
0b8f18e3 JL |
182 | fattr->cf_atime = cifs_NTtimeToUnix(info->LastAccessTime); |
183 | fattr->cf_ctime = cifs_NTtimeToUnix(info->ChangeTime); | |
184 | fattr->cf_mtime = cifs_NTtimeToUnix(info->LastWriteTime); | |
185 | ||
186 | cifs_fill_common_info(fattr, cifs_sb); | |
187 | } | |
1da177e4 | 188 | |
15dd4781 | 189 | static void |
0b8f18e3 JL |
190 | cifs_std_info_to_fattr(struct cifs_fattr *fattr, FIND_FILE_STANDARD_INFO *info, |
191 | struct cifs_sb_info *cifs_sb) | |
192 | { | |
0d424ad0 | 193 | int offset = cifs_sb_master_tcon(cifs_sb)->ses->server->timeAdj; |
1da177e4 | 194 | |
0b8f18e3 JL |
195 | memset(fattr, 0, sizeof(*fattr)); |
196 | fattr->cf_atime = cnvrtDosUnixTm(info->LastAccessDate, | |
197 | info->LastAccessTime, offset); | |
198 | fattr->cf_ctime = cnvrtDosUnixTm(info->LastWriteDate, | |
199 | info->LastWriteTime, offset); | |
200 | fattr->cf_mtime = cnvrtDosUnixTm(info->LastWriteDate, | |
201 | info->LastWriteTime, offset); | |
202 | ||
203 | fattr->cf_cifsattrs = le16_to_cpu(info->Attributes); | |
204 | fattr->cf_bytes = le32_to_cpu(info->AllocationSize); | |
205 | fattr->cf_eof = le32_to_cpu(info->DataSize); | |
206 | ||
207 | cifs_fill_common_info(fattr, cifs_sb); | |
1da177e4 LT |
208 | } |
209 | ||
0e0d2cf3 SF |
210 | /* BB eventually need to add the following helper function to |
211 | resolve NT_STATUS_STOPPED_ON_SYMLINK return code when | |
212 | we try to do FindFirst on (NTFS) directory symlinks */ | |
213 | /* | |
214 | int get_symlink_reparse_path(char *full_path, struct cifs_sb_info *cifs_sb, | |
6d5786a3 | 215 | unsigned int xid) |
0e0d2cf3 SF |
216 | { |
217 | __u16 fid; | |
218 | int len; | |
219 | int oplock = 0; | |
220 | int rc; | |
96daf2b0 | 221 | struct cifs_tcon *ptcon = cifs_sb_tcon(cifs_sb); |
0e0d2cf3 SF |
222 | char *tmpbuffer; |
223 | ||
224 | rc = CIFSSMBOpen(xid, ptcon, full_path, FILE_OPEN, GENERIC_READ, | |
225 | OPEN_REPARSE_POINT, &fid, &oplock, NULL, | |
226 | cifs_sb->local_nls, | |
227 | cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR); | |
228 | if (!rc) { | |
229 | tmpbuffer = kmalloc(maxpath); | |
230 | rc = CIFSSMBQueryReparseLinkInfo(xid, ptcon, full_path, | |
231 | tmpbuffer, | |
232 | maxpath -1, | |
233 | fid, | |
234 | cifs_sb->local_nls); | |
235 | if (CIFSSMBClose(xid, ptcon, fid)) { | |
f96637be | 236 | cifs_dbg(FYI, "Error closing temporary reparsepoint open\n"); |
0e0d2cf3 SF |
237 | } |
238 | } | |
239 | } | |
240 | */ | |
241 | ||
92fc65a7 PS |
242 | static int |
243 | initiate_cifs_search(const unsigned int xid, struct file *file) | |
1da177e4 | 244 | { |
2608bee7 | 245 | __u16 search_flags; |
1da177e4 | 246 | int rc = 0; |
7ffec372 | 247 | char *full_path = NULL; |
3870253e | 248 | struct cifsFileInfo *cifsFile; |
7ffec372 | 249 | struct cifs_sb_info *cifs_sb = CIFS_SB(file->f_path.dentry->d_sb); |
59c55ba1 | 250 | struct tcon_link *tlink = NULL; |
29e20f9c | 251 | struct cifs_tcon *tcon; |
92fc65a7 | 252 | struct TCP_Server_Info *server; |
1da177e4 | 253 | |
7ffec372 | 254 | if (file->private_data == NULL) { |
59c55ba1 JL |
255 | tlink = cifs_sb_tlink(cifs_sb); |
256 | if (IS_ERR(tlink)) | |
257 | return PTR_ERR(tlink); | |
258 | ||
259 | cifsFile = kzalloc(sizeof(struct cifsFileInfo), GFP_KERNEL); | |
260 | if (cifsFile == NULL) { | |
261 | rc = -ENOMEM; | |
262 | goto error_exit; | |
263 | } | |
264 | file->private_data = cifsFile; | |
265 | cifsFile->tlink = cifs_get_tlink(tlink); | |
29e20f9c | 266 | tcon = tlink_tcon(tlink); |
59c55ba1 JL |
267 | } else { |
268 | cifsFile = file->private_data; | |
29e20f9c | 269 | tcon = tlink_tcon(cifsFile->tlink); |
7ffec372 | 270 | } |
1da177e4 | 271 | |
92fc65a7 PS |
272 | server = tcon->ses->server; |
273 | ||
274 | if (!server->ops->query_dir_first) { | |
275 | rc = -ENOSYS; | |
276 | goto error_exit; | |
277 | } | |
278 | ||
4b18f2a9 SF |
279 | cifsFile->invalidHandle = true; |
280 | cifsFile->srch_inf.endOfSearch = false; | |
1da177e4 | 281 | |
e6a00296 | 282 | full_path = build_path_from_dentry(file->f_path.dentry); |
7ffec372 JL |
283 | if (full_path == NULL) { |
284 | rc = -ENOMEM; | |
285 | goto error_exit; | |
286 | } | |
1da177e4 | 287 | |
f96637be | 288 | cifs_dbg(FYI, "Full path: %s start at: %lld\n", full_path, file->f_pos); |
1da177e4 | 289 | |
75cf6bdc | 290 | ffirst_retry: |
1da177e4 | 291 | /* test for Unix extensions */ |
c18c842b | 292 | /* but now check for them on the share/mount not on the SMB session */ |
29e20f9c PS |
293 | /* if (cap_unix(tcon->ses) { */ |
294 | if (tcon->unix_ext) | |
5bafd765 | 295 | cifsFile->srch_inf.info_level = SMB_FIND_FILE_UNIX; |
29e20f9c PS |
296 | else if ((tcon->ses->capabilities & |
297 | tcon->ses->server->vals->cap_nt_find) == 0) { | |
5bafd765 | 298 | cifsFile->srch_inf.info_level = SMB_FIND_FILE_INFO_STANDARD; |
1da177e4 LT |
299 | } else if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM) { |
300 | cifsFile->srch_inf.info_level = SMB_FIND_FILE_ID_FULL_DIR_INFO; | |
301 | } else /* not srvinos - BB fixme add check for backlevel? */ { | |
302 | cifsFile->srch_inf.info_level = SMB_FIND_FILE_DIRECTORY_INFO; | |
303 | } | |
304 | ||
2608bee7 SP |
305 | search_flags = CIFS_SEARCH_CLOSE_AT_END | CIFS_SEARCH_RETURN_RESUME; |
306 | if (backup_cred(cifs_sb)) | |
307 | search_flags |= CIFS_SEARCH_BACKUP_SEARCH; | |
308 | ||
92fc65a7 PS |
309 | rc = server->ops->query_dir_first(xid, tcon, full_path, cifs_sb, |
310 | &cifsFile->fid, search_flags, | |
311 | &cifsFile->srch_inf); | |
312 | ||
4523cc30 | 313 | if (rc == 0) |
4b18f2a9 | 314 | cifsFile->invalidHandle = false; |
e836f015 | 315 | /* BB add following call to handle readdir on new NTFS symlink errors |
0e0d2cf3 SF |
316 | else if STATUS_STOPPED_ON_SYMLINK |
317 | call get_symlink_reparse_path and retry with new path */ | |
318 | else if ((rc == -EOPNOTSUPP) && | |
75cf6bdc SF |
319 | (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM)) { |
320 | cifs_sb->mnt_cifs_flags &= ~CIFS_MOUNT_SERVER_INUM; | |
321 | goto ffirst_retry; | |
322 | } | |
7ffec372 | 323 | error_exit: |
1da177e4 | 324 | kfree(full_path); |
7ffec372 | 325 | cifs_put_tlink(tlink); |
1da177e4 LT |
326 | return rc; |
327 | } | |
328 | ||
329 | /* return length of unicode string in bytes */ | |
cda0ec6a | 330 | static int cifs_unicode_bytelen(const char *str) |
1da177e4 LT |
331 | { |
332 | int len; | |
cda0ec6a | 333 | const __le16 *ustr = (const __le16 *)str; |
1da177e4 | 334 | |
3870253e | 335 | for (len = 0; len <= PATH_MAX; len++) { |
4523cc30 | 336 | if (ustr[len] == 0) |
1da177e4 LT |
337 | return len << 1; |
338 | } | |
f96637be | 339 | cifs_dbg(FYI, "Unicode string longer than PATH_MAX found\n"); |
1da177e4 LT |
340 | return len << 1; |
341 | } | |
342 | ||
5bafd765 | 343 | static char *nxt_dir_entry(char *old_entry, char *end_of_smb, int level) |
1da177e4 | 344 | { |
3870253e | 345 | char *new_entry; |
ad7a2926 | 346 | FILE_DIRECTORY_INFO *pDirInfo = (FILE_DIRECTORY_INFO *)old_entry; |
1da177e4 | 347 | |
4523cc30 | 348 | if (level == SMB_FIND_FILE_INFO_STANDARD) { |
ad7a2926 | 349 | FIND_FILE_STANDARD_INFO *pfData; |
5bafd765 SF |
350 | pfData = (FIND_FILE_STANDARD_INFO *)pDirInfo; |
351 | ||
352 | new_entry = old_entry + sizeof(FIND_FILE_STANDARD_INFO) + | |
353 | pfData->FileNameLength; | |
354 | } else | |
355 | new_entry = old_entry + le32_to_cpu(pDirInfo->NextEntryOffset); | |
f96637be | 356 | cifs_dbg(FYI, "new entry %p old entry %p\n", new_entry, old_entry); |
1da177e4 | 357 | /* validate that new_entry is not past end of SMB */ |
4523cc30 | 358 | if (new_entry >= end_of_smb) { |
f96637be JP |
359 | cifs_dbg(VFS, "search entry %p began after end of SMB %p old entry %p\n", |
360 | new_entry, end_of_smb, old_entry); | |
1da177e4 | 361 | return NULL; |
4523cc30 | 362 | } else if (((level == SMB_FIND_FILE_INFO_STANDARD) && |
3870253e SF |
363 | (new_entry + sizeof(FIND_FILE_STANDARD_INFO) > end_of_smb)) |
364 | || ((level != SMB_FIND_FILE_INFO_STANDARD) && | |
5bafd765 | 365 | (new_entry + sizeof(FILE_DIRECTORY_INFO) > end_of_smb))) { |
f96637be JP |
366 | cifs_dbg(VFS, "search entry %p extends after end of SMB %p\n", |
367 | new_entry, end_of_smb); | |
09d1db5c | 368 | return NULL; |
3870253e | 369 | } else |
1da177e4 LT |
370 | return new_entry; |
371 | ||
372 | } | |
373 | ||
cda0ec6a CH |
374 | struct cifs_dirent { |
375 | const char *name; | |
376 | size_t namelen; | |
377 | u32 resume_key; | |
378 | u64 ino; | |
379 | }; | |
380 | ||
381 | static void cifs_fill_dirent_unix(struct cifs_dirent *de, | |
382 | const FILE_UNIX_INFO *info, bool is_unicode) | |
383 | { | |
384 | de->name = &info->FileName[0]; | |
385 | if (is_unicode) | |
386 | de->namelen = cifs_unicode_bytelen(de->name); | |
387 | else | |
388 | de->namelen = strnlen(de->name, PATH_MAX); | |
389 | de->resume_key = info->ResumeKey; | |
390 | de->ino = le64_to_cpu(info->basic.UniqueId); | |
391 | } | |
392 | ||
393 | static void cifs_fill_dirent_dir(struct cifs_dirent *de, | |
394 | const FILE_DIRECTORY_INFO *info) | |
395 | { | |
396 | de->name = &info->FileName[0]; | |
397 | de->namelen = le32_to_cpu(info->FileNameLength); | |
398 | de->resume_key = info->FileIndex; | |
399 | } | |
400 | ||
401 | static void cifs_fill_dirent_full(struct cifs_dirent *de, | |
402 | const FILE_FULL_DIRECTORY_INFO *info) | |
403 | { | |
404 | de->name = &info->FileName[0]; | |
405 | de->namelen = le32_to_cpu(info->FileNameLength); | |
406 | de->resume_key = info->FileIndex; | |
407 | } | |
408 | ||
409 | static void cifs_fill_dirent_search(struct cifs_dirent *de, | |
410 | const SEARCH_ID_FULL_DIR_INFO *info) | |
411 | { | |
412 | de->name = &info->FileName[0]; | |
413 | de->namelen = le32_to_cpu(info->FileNameLength); | |
414 | de->resume_key = info->FileIndex; | |
415 | de->ino = le64_to_cpu(info->UniqueId); | |
416 | } | |
417 | ||
418 | static void cifs_fill_dirent_both(struct cifs_dirent *de, | |
419 | const FILE_BOTH_DIRECTORY_INFO *info) | |
420 | { | |
421 | de->name = &info->FileName[0]; | |
422 | de->namelen = le32_to_cpu(info->FileNameLength); | |
423 | de->resume_key = info->FileIndex; | |
424 | } | |
425 | ||
426 | static void cifs_fill_dirent_std(struct cifs_dirent *de, | |
427 | const FIND_FILE_STANDARD_INFO *info) | |
428 | { | |
429 | de->name = &info->FileName[0]; | |
430 | /* one byte length, no endianess conversion */ | |
431 | de->namelen = info->FileNameLength; | |
432 | de->resume_key = info->ResumeKey; | |
433 | } | |
434 | ||
435 | static int cifs_fill_dirent(struct cifs_dirent *de, const void *info, | |
436 | u16 level, bool is_unicode) | |
437 | { | |
438 | memset(de, 0, sizeof(*de)); | |
439 | ||
440 | switch (level) { | |
441 | case SMB_FIND_FILE_UNIX: | |
442 | cifs_fill_dirent_unix(de, info, is_unicode); | |
443 | break; | |
444 | case SMB_FIND_FILE_DIRECTORY_INFO: | |
445 | cifs_fill_dirent_dir(de, info); | |
446 | break; | |
447 | case SMB_FIND_FILE_FULL_DIRECTORY_INFO: | |
448 | cifs_fill_dirent_full(de, info); | |
449 | break; | |
450 | case SMB_FIND_FILE_ID_FULL_DIR_INFO: | |
451 | cifs_fill_dirent_search(de, info); | |
452 | break; | |
453 | case SMB_FIND_FILE_BOTH_DIRECTORY_INFO: | |
454 | cifs_fill_dirent_both(de, info); | |
455 | break; | |
456 | case SMB_FIND_FILE_INFO_STANDARD: | |
457 | cifs_fill_dirent_std(de, info); | |
458 | break; | |
459 | default: | |
f96637be | 460 | cifs_dbg(FYI, "Unknown findfirst level %d\n", level); |
cda0ec6a CH |
461 | return -EINVAL; |
462 | } | |
463 | ||
464 | return 0; | |
465 | } | |
466 | ||
1da177e4 LT |
467 | #define UNICODE_DOT cpu_to_le16(0x2e) |
468 | ||
469 | /* return 0 if no match and 1 for . (current directory) and 2 for .. (parent) */ | |
cda0ec6a | 470 | static int cifs_entry_is_dot(struct cifs_dirent *de, bool is_unicode) |
1da177e4 LT |
471 | { |
472 | int rc = 0; | |
1da177e4 | 473 | |
cda0ec6a CH |
474 | if (!de->name) |
475 | return 0; | |
1da177e4 | 476 | |
cda0ec6a CH |
477 | if (is_unicode) { |
478 | __le16 *ufilename = (__le16 *)de->name; | |
479 | if (de->namelen == 2) { | |
480 | /* check for . */ | |
481 | if (ufilename[0] == UNICODE_DOT) | |
482 | rc = 1; | |
483 | } else if (de->namelen == 4) { | |
484 | /* check for .. */ | |
485 | if (ufilename[0] == UNICODE_DOT && | |
486 | ufilename[1] == UNICODE_DOT) | |
487 | rc = 2; | |
488 | } | |
489 | } else /* ASCII */ { | |
490 | if (de->namelen == 1) { | |
491 | if (de->name[0] == '.') | |
492 | rc = 1; | |
493 | } else if (de->namelen == 2) { | |
494 | if (de->name[0] == '.' && de->name[1] == '.') | |
495 | rc = 2; | |
1da177e4 LT |
496 | } |
497 | } | |
498 | ||
499 | return rc; | |
500 | } | |
501 | ||
eafe8701 SF |
502 | /* Check if directory that we are searching has changed so we can decide |
503 | whether we can use the cached search results from the previous search */ | |
3870253e | 504 | static int is_dir_changed(struct file *file) |
eafe8701 | 505 | { |
496ad9aa | 506 | struct inode *inode = file_inode(file); |
c33f8d32 | 507 | struct cifsInodeInfo *cifsInfo = CIFS_I(inode); |
eafe8701 | 508 | |
c33f8d32 | 509 | if (cifsInfo->time == 0) |
eafe8701 SF |
510 | return 1; /* directory was changed, perhaps due to unlink */ |
511 | else | |
512 | return 0; | |
513 | ||
514 | } | |
515 | ||
0752f152 | 516 | static int cifs_save_resume_key(const char *current_entry, |
eaf35b1e | 517 | struct cifsFileInfo *file_info) |
0752f152 | 518 | { |
eaf35b1e CH |
519 | struct cifs_dirent de; |
520 | int rc; | |
0752f152 | 521 | |
eaf35b1e CH |
522 | rc = cifs_fill_dirent(&de, current_entry, file_info->srch_inf.info_level, |
523 | file_info->srch_inf.unicode); | |
524 | if (!rc) { | |
525 | file_info->srch_inf.presume_name = de.name; | |
526 | file_info->srch_inf.resume_name_len = de.namelen; | |
527 | file_info->srch_inf.resume_key = de.resume_key; | |
0752f152 | 528 | } |
0752f152 SF |
529 | return rc; |
530 | } | |
531 | ||
92fc65a7 PS |
532 | /* |
533 | * Find the corresponding entry in the search. Note that the SMB server returns | |
534 | * search entries for . and .. which complicates logic here if we choose to | |
535 | * parse for them and we do not assume that they are located in the findfirst | |
536 | * return buffer. We start counting in the buffer with entry 2 and increment for | |
537 | * every entry (do not increment for . or .. entry). | |
538 | */ | |
539 | static int | |
540 | find_cifs_entry(const unsigned int xid, struct cifs_tcon *tcon, | |
541 | struct file *file, char **current_entry, int *num_to_ret) | |
1da177e4 | 542 | { |
2608bee7 | 543 | __u16 search_flags; |
1da177e4 LT |
544 | int rc = 0; |
545 | int pos_in_buf = 0; | |
546 | loff_t first_entry_in_buffer; | |
547 | loff_t index_to_find = file->f_pos; | |
92fc65a7 | 548 | struct cifsFileInfo *cfile = file->private_data; |
2608bee7 | 549 | struct cifs_sb_info *cifs_sb = CIFS_SB(file->f_path.dentry->d_sb); |
92fc65a7 | 550 | struct TCP_Server_Info *server = tcon->ses->server; |
1da177e4 | 551 | /* check if index in the buffer */ |
50c2f753 | 552 | |
92fc65a7 PS |
553 | if (!server->ops->query_dir_first || !server->ops->query_dir_next) |
554 | return -ENOSYS; | |
555 | ||
556 | if ((cfile == NULL) || (current_entry == NULL) || (num_to_ret == NULL)) | |
1da177e4 | 557 | return -ENOENT; |
50c2f753 | 558 | |
92fc65a7 PS |
559 | *current_entry = NULL; |
560 | first_entry_in_buffer = cfile->srch_inf.index_of_last_entry - | |
561 | cfile->srch_inf.entries_in_buffer; | |
60808233 | 562 | |
92fc65a7 PS |
563 | /* |
564 | * If first entry in buf is zero then is first buffer | |
565 | * in search response data which means it is likely . and .. | |
566 | * will be in this buffer, although some servers do not return | |
567 | * . and .. for the root of a drive and for those we need | |
568 | * to start two entries earlier. | |
569 | */ | |
60808233 | 570 | |
3979877e | 571 | dump_cifs_file_struct(file, "In fce "); |
92fc65a7 PS |
572 | if (((index_to_find < cfile->srch_inf.index_of_last_entry) && |
573 | is_dir_changed(file)) || (index_to_find < first_entry_in_buffer)) { | |
1da177e4 | 574 | /* close and restart search */ |
f96637be | 575 | cifs_dbg(FYI, "search backing up - close and restart search\n"); |
4477288a | 576 | spin_lock(&cifs_file_list_lock); |
92fc65a7 PS |
577 | if (!cfile->srch_inf.endOfSearch && !cfile->invalidHandle) { |
578 | cfile->invalidHandle = true; | |
4477288a | 579 | spin_unlock(&cifs_file_list_lock); |
92fc65a7 PS |
580 | if (server->ops->close) |
581 | server->ops->close(xid, tcon, &cfile->fid); | |
ddb4cbfc | 582 | } else |
4477288a | 583 | spin_unlock(&cifs_file_list_lock); |
92fc65a7 | 584 | if (cfile->srch_inf.ntwrk_buf_start) { |
f96637be | 585 | cifs_dbg(FYI, "freeing SMB ff cache buf on search rewind\n"); |
92fc65a7 PS |
586 | if (cfile->srch_inf.smallBuf) |
587 | cifs_small_buf_release(cfile->srch_inf. | |
d47d7c1a SF |
588 | ntwrk_buf_start); |
589 | else | |
92fc65a7 | 590 | cifs_buf_release(cfile->srch_inf. |
d47d7c1a | 591 | ntwrk_buf_start); |
92fc65a7 | 592 | cfile->srch_inf.ntwrk_buf_start = NULL; |
1da177e4 | 593 | } |
3870253e | 594 | rc = initiate_cifs_search(xid, file); |
4523cc30 | 595 | if (rc) { |
f96637be | 596 | cifs_dbg(FYI, "error %d reinitiating a search on rewind\n", |
b6b38f70 | 597 | rc); |
1da177e4 LT |
598 | return rc; |
599 | } | |
7023676f | 600 | /* FindFirst/Next set last_entry to NULL on malformed reply */ |
92fc65a7 PS |
601 | if (cfile->srch_inf.last_entry) |
602 | cifs_save_resume_key(cfile->srch_inf.last_entry, cfile); | |
1da177e4 LT |
603 | } |
604 | ||
2608bee7 SP |
605 | search_flags = CIFS_SEARCH_CLOSE_AT_END | CIFS_SEARCH_RETURN_RESUME; |
606 | if (backup_cred(cifs_sb)) | |
607 | search_flags |= CIFS_SEARCH_BACKUP_SEARCH; | |
608 | ||
92fc65a7 PS |
609 | while ((index_to_find >= cfile->srch_inf.index_of_last_entry) && |
610 | (rc == 0) && !cfile->srch_inf.endOfSearch) { | |
f96637be | 611 | cifs_dbg(FYI, "calling findnext2\n"); |
92fc65a7 PS |
612 | rc = server->ops->query_dir_next(xid, tcon, &cfile->fid, |
613 | search_flags, | |
614 | &cfile->srch_inf); | |
7023676f | 615 | /* FindFirst/Next set last_entry to NULL on malformed reply */ |
92fc65a7 PS |
616 | if (cfile->srch_inf.last_entry) |
617 | cifs_save_resume_key(cfile->srch_inf.last_entry, cfile); | |
4523cc30 | 618 | if (rc) |
1da177e4 LT |
619 | return -ENOENT; |
620 | } | |
92fc65a7 | 621 | if (index_to_find < cfile->srch_inf.index_of_last_entry) { |
1da177e4 LT |
622 | /* we found the buffer that contains the entry */ |
623 | /* scan and find it */ | |
624 | int i; | |
92fc65a7 PS |
625 | char *cur_ent; |
626 | char *end_of_smb = cfile->srch_inf.ntwrk_buf_start + | |
627 | server->ops->calc_smb_size( | |
628 | cfile->srch_inf.ntwrk_buf_start); | |
629 | ||
630 | cur_ent = cfile->srch_inf.srch_entries_start; | |
631 | first_entry_in_buffer = cfile->srch_inf.index_of_last_entry | |
632 | - cfile->srch_inf.entries_in_buffer; | |
1da177e4 | 633 | pos_in_buf = index_to_find - first_entry_in_buffer; |
f96637be | 634 | cifs_dbg(FYI, "found entry - pos_in_buf %d\n", pos_in_buf); |
5bafd765 | 635 | |
92fc65a7 | 636 | for (i = 0; (i < (pos_in_buf)) && (cur_ent != NULL); i++) { |
dfb7533b | 637 | /* go entry by entry figuring out which is first */ |
92fc65a7 PS |
638 | cur_ent = nxt_dir_entry(cur_ent, end_of_smb, |
639 | cfile->srch_inf.info_level); | |
1da177e4 | 640 | } |
92fc65a7 | 641 | if ((cur_ent == NULL) && (i < pos_in_buf)) { |
1da177e4 | 642 | /* BB fixme - check if we should flag this error */ |
f96637be JP |
643 | cifs_dbg(VFS, "reached end of buf searching for pos in buf %d index to find %lld rc %d\n", |
644 | pos_in_buf, index_to_find, rc); | |
1da177e4 LT |
645 | } |
646 | rc = 0; | |
92fc65a7 | 647 | *current_entry = cur_ent; |
1da177e4 | 648 | } else { |
f96637be | 649 | cifs_dbg(FYI, "index not in buffer - could not findnext into it\n"); |
1da177e4 LT |
650 | return 0; |
651 | } | |
652 | ||
92fc65a7 | 653 | if (pos_in_buf >= cfile->srch_inf.entries_in_buffer) { |
f96637be | 654 | cifs_dbg(FYI, "can not return entries pos_in_buf beyond last\n"); |
1da177e4 LT |
655 | *num_to_ret = 0; |
656 | } else | |
92fc65a7 | 657 | *num_to_ret = cfile->srch_inf.entries_in_buffer - pos_in_buf; |
1da177e4 LT |
658 | |
659 | return rc; | |
660 | } | |
661 | ||
9feed6f8 CH |
662 | static int cifs_filldir(char *find_entry, struct file *file, filldir_t filldir, |
663 | void *dirent, char *scratch_buf, unsigned int max_len) | |
1da177e4 | 664 | { |
9feed6f8 CH |
665 | struct cifsFileInfo *file_info = file->private_data; |
666 | struct super_block *sb = file->f_path.dentry->d_sb; | |
667 | struct cifs_sb_info *cifs_sb = CIFS_SB(sb); | |
cda0ec6a | 668 | struct cifs_dirent de = { NULL, }; |
cc0bad75 | 669 | struct cifs_fattr fattr; |
9feed6f8 | 670 | struct qstr name; |
1da177e4 | 671 | int rc = 0; |
9feed6f8 | 672 | ino_t ino; |
1da177e4 | 673 | |
cda0ec6a CH |
674 | rc = cifs_fill_dirent(&de, find_entry, file_info->srch_inf.info_level, |
675 | file_info->srch_inf.unicode); | |
676 | if (rc) | |
677 | return rc; | |
5bafd765 | 678 | |
f16d59b4 | 679 | if (de.namelen > max_len) { |
f96637be JP |
680 | cifs_dbg(VFS, "bad search response length %zd past smb end\n", |
681 | de.namelen); | |
5bafd765 SF |
682 | return -EINVAL; |
683 | } | |
684 | ||
60808233 | 685 | /* skip . and .. since we added them first */ |
cda0ec6a | 686 | if (cifs_entry_is_dot(&de, file_info->srch_inf.unicode)) |
60808233 SF |
687 | return 0; |
688 | ||
f16d59b4 CH |
689 | if (file_info->srch_inf.unicode) { |
690 | struct nls_table *nlt = cifs_sb->local_nls; | |
1da177e4 | 691 | |
f16d59b4 CH |
692 | name.name = scratch_buf; |
693 | name.len = | |
acbbb76a SF |
694 | cifs_from_utf16((char *)name.name, (__le16 *)de.name, |
695 | UNICODE_NAME_MAX, | |
696 | min_t(size_t, de.namelen, | |
697 | (size_t)max_len), nlt, | |
698 | cifs_sb->mnt_cifs_flags & | |
f16d59b4 CH |
699 | CIFS_MOUNT_MAP_SPECIAL_CHR); |
700 | name.len -= nls_nullsize(nlt); | |
701 | } else { | |
702 | name.name = de.name; | |
703 | name.len = de.namelen; | |
704 | } | |
1da177e4 | 705 | |
9feed6f8 CH |
706 | switch (file_info->srch_inf.info_level) { |
707 | case SMB_FIND_FILE_UNIX: | |
cc0bad75 | 708 | cifs_unix_basic_to_fattr(&fattr, |
9feed6f8 CH |
709 | &((FILE_UNIX_INFO *)find_entry)->basic, |
710 | cifs_sb); | |
711 | break; | |
712 | case SMB_FIND_FILE_INFO_STANDARD: | |
713 | cifs_std_info_to_fattr(&fattr, | |
714 | (FIND_FILE_STANDARD_INFO *)find_entry, | |
715 | cifs_sb); | |
716 | break; | |
717 | default: | |
718 | cifs_dir_info_to_fattr(&fattr, | |
719 | (FILE_DIRECTORY_INFO *)find_entry, | |
720 | cifs_sb); | |
721 | break; | |
722 | } | |
b835bebe | 723 | |
f16d59b4 CH |
724 | if (de.ino && (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM)) { |
725 | fattr.cf_uniqueid = de.ino; | |
ec06aedd | 726 | } else { |
0b8f18e3 | 727 | fattr.cf_uniqueid = iunique(sb, ROOT_I); |
ec06aedd JL |
728 | cifs_autodisable_serverino(cifs_sb); |
729 | } | |
50c2f753 | 730 | |
1b12b9c1 SM |
731 | if ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MF_SYMLINKS) && |
732 | CIFSCouldBeMFSymlink(&fattr)) | |
733 | /* | |
734 | * trying to get the type and mode can be slow, | |
735 | * so just call those regular files for now, and mark | |
736 | * for reval | |
737 | */ | |
738 | fattr.cf_flags |= CIFS_FATTR_NEED_REVAL; | |
739 | ||
eb1b3fa5 | 740 | cifs_prime_dcache(file->f_dentry, &name, &fattr); |
3870253e | 741 | |
eb1b3fa5 | 742 | ino = cifs_uniqueid_to_ino_t(fattr.cf_uniqueid); |
9feed6f8 CH |
743 | rc = filldir(dirent, name.name, name.len, file->f_pos, ino, |
744 | fattr.cf_dtype); | |
1da177e4 LT |
745 | return rc; |
746 | } | |
747 | ||
1da177e4 LT |
748 | |
749 | int cifs_readdir(struct file *file, void *direntry, filldir_t filldir) | |
750 | { | |
751 | int rc = 0; | |
6d5786a3 PS |
752 | unsigned int xid; |
753 | int i; | |
92fc65a7 | 754 | struct cifs_tcon *tcon; |
1da177e4 | 755 | struct cifsFileInfo *cifsFile = NULL; |
3870253e | 756 | char *current_entry; |
1da177e4 | 757 | int num_to_fill = 0; |
3870253e | 758 | char *tmp_buf = NULL; |
50c2f753 | 759 | char *end_of_smb; |
18295796 | 760 | unsigned int max_len; |
1da177e4 | 761 | |
6d5786a3 | 762 | xid = get_xid(); |
1da177e4 | 763 | |
6221ddd0 SJ |
764 | /* |
765 | * Ensure FindFirst doesn't fail before doing filldir() for '.' and | |
766 | * '..'. Otherwise we won't be able to notify VFS in case of failure. | |
767 | */ | |
768 | if (file->private_data == NULL) { | |
769 | rc = initiate_cifs_search(xid, file); | |
f96637be | 770 | cifs_dbg(FYI, "initiate cifs search rc %d\n", rc); |
6221ddd0 SJ |
771 | if (rc) |
772 | goto rddir2_exit; | |
773 | } | |
774 | ||
1da177e4 LT |
775 | switch ((int) file->f_pos) { |
776 | case 0: | |
60808233 | 777 | if (filldir(direntry, ".", 1, file->f_pos, |
496ad9aa | 778 | file_inode(file)->i_ino, DT_DIR) < 0) { |
f96637be | 779 | cifs_dbg(VFS, "Filldir for current dir failed\n"); |
1da177e4 LT |
780 | rc = -ENOMEM; |
781 | break; | |
782 | } | |
60808233 | 783 | file->f_pos++; |
1da177e4 | 784 | case 1: |
60808233 | 785 | if (filldir(direntry, "..", 2, file->f_pos, |
b85fd6bd | 786 | parent_ino(file->f_path.dentry), DT_DIR) < 0) { |
f96637be | 787 | cifs_dbg(VFS, "Filldir for parent dir failed\n"); |
1da177e4 LT |
788 | rc = -ENOMEM; |
789 | break; | |
790 | } | |
60808233 SF |
791 | file->f_pos++; |
792 | default: | |
3870253e SF |
793 | /* 1) If search is active, |
794 | is in current search buffer? | |
1da177e4 LT |
795 | if it before then restart search |
796 | if after then keep searching till find it */ | |
797 | ||
790fe579 | 798 | if (file->private_data == NULL) { |
1da177e4 | 799 | rc = -EINVAL; |
6d5786a3 | 800 | free_xid(xid); |
1da177e4 LT |
801 | return rc; |
802 | } | |
803 | cifsFile = file->private_data; | |
804 | if (cifsFile->srch_inf.endOfSearch) { | |
790fe579 | 805 | if (cifsFile->srch_inf.emptyDir) { |
f96637be | 806 | cifs_dbg(FYI, "End of search, empty dir\n"); |
1da177e4 LT |
807 | rc = 0; |
808 | break; | |
809 | } | |
810 | } /* else { | |
4b18f2a9 | 811 | cifsFile->invalidHandle = true; |
92fc65a7 | 812 | tcon->ses->server->close(xid, tcon, &cifsFile->fid); |
aaa9bbe0 | 813 | } */ |
1da177e4 | 814 | |
92fc65a7 PS |
815 | tcon = tlink_tcon(cifsFile->tlink); |
816 | rc = find_cifs_entry(xid, tcon, file, ¤t_entry, | |
817 | &num_to_fill); | |
790fe579 | 818 | if (rc) { |
f96637be | 819 | cifs_dbg(FYI, "fce error %d\n", rc); |
1da177e4 LT |
820 | goto rddir2_exit; |
821 | } else if (current_entry != NULL) { | |
f96637be | 822 | cifs_dbg(FYI, "entry %lld found\n", file->f_pos); |
1da177e4 | 823 | } else { |
f96637be | 824 | cifs_dbg(FYI, "could not find entry\n"); |
1da177e4 LT |
825 | goto rddir2_exit; |
826 | } | |
f96637be JP |
827 | cifs_dbg(FYI, "loop through %d times filling dir for net buf %p\n", |
828 | num_to_fill, cifsFile->srch_inf.ntwrk_buf_start); | |
92fc65a7 | 829 | max_len = tcon->ses->server->ops->calc_smb_size( |
5bafd765 SF |
830 | cifsFile->srch_inf.ntwrk_buf_start); |
831 | end_of_smb = cifsFile->srch_inf.ntwrk_buf_start + max_len; | |
832 | ||
f5884166 | 833 | tmp_buf = kmalloc(UNICODE_NAME_MAX, GFP_KERNEL); |
f55fdcca KV |
834 | if (tmp_buf == NULL) { |
835 | rc = -ENOMEM; | |
836 | break; | |
837 | } | |
838 | ||
790fe579 SF |
839 | for (i = 0; (i < num_to_fill) && (rc == 0); i++) { |
840 | if (current_entry == NULL) { | |
1da177e4 | 841 | /* evaluate whether this case is an error */ |
f96637be JP |
842 | cifs_dbg(VFS, "past SMB end, num to fill %d i %d\n", |
843 | num_to_fill, i); | |
1da177e4 LT |
844 | break; |
845 | } | |
92fc65a7 PS |
846 | /* |
847 | * if buggy server returns . and .. late do we want to | |
848 | * check for that here? | |
849 | */ | |
850 | rc = cifs_filldir(current_entry, file, filldir, | |
851 | direntry, tmp_buf, max_len); | |
790fe579 | 852 | if (rc == -EOVERFLOW) { |
7ca85ba7 SF |
853 | rc = 0; |
854 | break; | |
855 | } | |
856 | ||
1da177e4 | 857 | file->f_pos++; |
790fe579 | 858 | if (file->f_pos == |
3979877e | 859 | cifsFile->srch_inf.index_of_last_entry) { |
f96637be JP |
860 | cifs_dbg(FYI, "last entry in buf at pos %lld %s\n", |
861 | file->f_pos, tmp_buf); | |
790fe579 | 862 | cifs_save_resume_key(current_entry, cifsFile); |
1da177e4 | 863 | break; |
790fe579 SF |
864 | } else |
865 | current_entry = | |
5bafd765 SF |
866 | nxt_dir_entry(current_entry, end_of_smb, |
867 | cifsFile->srch_inf.info_level); | |
1da177e4 LT |
868 | } |
869 | kfree(tmp_buf); | |
870 | break; | |
871 | } /* end switch */ | |
872 | ||
873 | rddir2_exit: | |
6d5786a3 | 874 | free_xid(xid); |
1da177e4 LT |
875 | return rc; |
876 | } |