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) { |
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 | ||
d1e8adc0 JL |
114 | /* |
115 | * If we know that the inode will need to be revalidated immediately, | |
116 | * then don't create a new dentry for it. We'll end up doing an on | |
117 | * the wire call either way and this spares us an invalidation. | |
118 | */ | |
119 | if (fattr->cf_flags & CIFS_FATTR_NEED_REVAL) | |
120 | return; | |
121 | ||
cc0bad75 | 122 | dentry = d_alloc(parent, name); |
eb1b3fa5 JL |
123 | if (!dentry) |
124 | return; | |
cc0bad75 JL |
125 | |
126 | inode = cifs_iget(sb, fattr); | |
eb1b3fa5 JL |
127 | if (!inode) |
128 | goto out; | |
cc0bad75 | 129 | |
cc0bad75 | 130 | alias = d_materialise_unique(dentry, inode); |
eb1b3fa5 JL |
131 | if (alias && !IS_ERR(alias)) |
132 | dput(alias); | |
133 | out: | |
134 | dput(dentry); | |
cc0bad75 JL |
135 | } |
136 | ||
0b8f18e3 JL |
137 | static void |
138 | cifs_fill_common_info(struct cifs_fattr *fattr, struct cifs_sb_info *cifs_sb) | |
1da177e4 | 139 | { |
0b8f18e3 JL |
140 | fattr->cf_uid = cifs_sb->mnt_uid; |
141 | fattr->cf_gid = cifs_sb->mnt_gid; | |
1da177e4 | 142 | |
0b8f18e3 JL |
143 | if (fattr->cf_cifsattrs & ATTR_DIRECTORY) { |
144 | fattr->cf_mode = S_IFDIR | cifs_sb->mnt_dir_mode; | |
145 | fattr->cf_dtype = DT_DIR; | |
1da177e4 | 146 | } else { |
0b8f18e3 JL |
147 | fattr->cf_mode = S_IFREG | cifs_sb->mnt_file_mode; |
148 | fattr->cf_dtype = DT_REG; | |
1da177e4 LT |
149 | } |
150 | ||
0b8f18e3 JL |
151 | if (fattr->cf_cifsattrs & ATTR_READONLY) |
152 | fattr->cf_mode &= ~S_IWUGO; | |
5bafd765 | 153 | |
ccb5c001 JL |
154 | /* |
155 | * We of course don't get ACL info in FIND_FIRST/NEXT results, so | |
156 | * mark it for revalidation so that "ls -l" will look right. It might | |
157 | * be super-slow, but if we don't do this then the ownership of files | |
158 | * may look wrong since the inodes may not have timed out by the time | |
159 | * "ls" does a stat() call on them. | |
160 | */ | |
161 | if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_CIFS_ACL) | |
162 | fattr->cf_flags |= CIFS_FATTR_NEED_REVAL; | |
163 | ||
0b8f18e3 JL |
164 | if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_UNX_EMUL && |
165 | fattr->cf_cifsattrs & ATTR_SYSTEM) { | |
166 | if (fattr->cf_eof == 0) { | |
167 | fattr->cf_mode &= ~S_IFMT; | |
168 | fattr->cf_mode |= S_IFIFO; | |
169 | fattr->cf_dtype = DT_FIFO; | |
3020a1f5 | 170 | } else { |
4468eb3f | 171 | /* |
0b8f18e3 JL |
172 | * trying to get the type and mode via SFU can be slow, |
173 | * so just call those regular files for now, and mark | |
174 | * for reval | |
4468eb3f | 175 | */ |
0b8f18e3 | 176 | fattr->cf_flags |= CIFS_FATTR_NEED_REVAL; |
4468eb3f JL |
177 | } |
178 | } | |
0b8f18e3 | 179 | } |
1da177e4 | 180 | |
c052e2b4 | 181 | void |
0b8f18e3 JL |
182 | cifs_dir_info_to_fattr(struct cifs_fattr *fattr, FILE_DIRECTORY_INFO *info, |
183 | struct cifs_sb_info *cifs_sb) | |
184 | { | |
185 | memset(fattr, 0, sizeof(*fattr)); | |
186 | fattr->cf_cifsattrs = le32_to_cpu(info->ExtFileAttributes); | |
187 | fattr->cf_eof = le64_to_cpu(info->EndOfFile); | |
188 | fattr->cf_bytes = le64_to_cpu(info->AllocationSize); | |
20054bd6 | 189 | fattr->cf_createtime = le64_to_cpu(info->CreationTime); |
0b8f18e3 JL |
190 | fattr->cf_atime = cifs_NTtimeToUnix(info->LastAccessTime); |
191 | fattr->cf_ctime = cifs_NTtimeToUnix(info->ChangeTime); | |
192 | fattr->cf_mtime = cifs_NTtimeToUnix(info->LastWriteTime); | |
193 | ||
194 | cifs_fill_common_info(fattr, cifs_sb); | |
195 | } | |
1da177e4 | 196 | |
15dd4781 | 197 | static void |
0b8f18e3 JL |
198 | cifs_std_info_to_fattr(struct cifs_fattr *fattr, FIND_FILE_STANDARD_INFO *info, |
199 | struct cifs_sb_info *cifs_sb) | |
200 | { | |
0d424ad0 | 201 | int offset = cifs_sb_master_tcon(cifs_sb)->ses->server->timeAdj; |
1da177e4 | 202 | |
0b8f18e3 JL |
203 | memset(fattr, 0, sizeof(*fattr)); |
204 | fattr->cf_atime = cnvrtDosUnixTm(info->LastAccessDate, | |
205 | info->LastAccessTime, offset); | |
206 | fattr->cf_ctime = cnvrtDosUnixTm(info->LastWriteDate, | |
207 | info->LastWriteTime, offset); | |
208 | fattr->cf_mtime = cnvrtDosUnixTm(info->LastWriteDate, | |
209 | info->LastWriteTime, offset); | |
210 | ||
211 | fattr->cf_cifsattrs = le16_to_cpu(info->Attributes); | |
212 | fattr->cf_bytes = le32_to_cpu(info->AllocationSize); | |
213 | fattr->cf_eof = le32_to_cpu(info->DataSize); | |
214 | ||
215 | cifs_fill_common_info(fattr, cifs_sb); | |
1da177e4 LT |
216 | } |
217 | ||
0e0d2cf3 SF |
218 | /* BB eventually need to add the following helper function to |
219 | resolve NT_STATUS_STOPPED_ON_SYMLINK return code when | |
220 | we try to do FindFirst on (NTFS) directory symlinks */ | |
221 | /* | |
222 | int get_symlink_reparse_path(char *full_path, struct cifs_sb_info *cifs_sb, | |
6d5786a3 | 223 | unsigned int xid) |
0e0d2cf3 SF |
224 | { |
225 | __u16 fid; | |
226 | int len; | |
227 | int oplock = 0; | |
228 | int rc; | |
96daf2b0 | 229 | struct cifs_tcon *ptcon = cifs_sb_tcon(cifs_sb); |
0e0d2cf3 SF |
230 | char *tmpbuffer; |
231 | ||
232 | rc = CIFSSMBOpen(xid, ptcon, full_path, FILE_OPEN, GENERIC_READ, | |
233 | OPEN_REPARSE_POINT, &fid, &oplock, NULL, | |
234 | cifs_sb->local_nls, | |
235 | cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR); | |
236 | if (!rc) { | |
237 | tmpbuffer = kmalloc(maxpath); | |
238 | rc = CIFSSMBQueryReparseLinkInfo(xid, ptcon, full_path, | |
239 | tmpbuffer, | |
240 | maxpath -1, | |
241 | fid, | |
242 | cifs_sb->local_nls); | |
243 | if (CIFSSMBClose(xid, ptcon, fid)) { | |
f96637be | 244 | cifs_dbg(FYI, "Error closing temporary reparsepoint open\n"); |
0e0d2cf3 SF |
245 | } |
246 | } | |
247 | } | |
248 | */ | |
249 | ||
92fc65a7 PS |
250 | static int |
251 | initiate_cifs_search(const unsigned int xid, struct file *file) | |
1da177e4 | 252 | { |
2608bee7 | 253 | __u16 search_flags; |
1da177e4 | 254 | int rc = 0; |
7ffec372 | 255 | char *full_path = NULL; |
3870253e | 256 | struct cifsFileInfo *cifsFile; |
7ffec372 | 257 | struct cifs_sb_info *cifs_sb = CIFS_SB(file->f_path.dentry->d_sb); |
59c55ba1 | 258 | struct tcon_link *tlink = NULL; |
29e20f9c | 259 | struct cifs_tcon *tcon; |
92fc65a7 | 260 | struct TCP_Server_Info *server; |
1da177e4 | 261 | |
7ffec372 | 262 | if (file->private_data == NULL) { |
59c55ba1 JL |
263 | tlink = cifs_sb_tlink(cifs_sb); |
264 | if (IS_ERR(tlink)) | |
265 | return PTR_ERR(tlink); | |
266 | ||
267 | cifsFile = kzalloc(sizeof(struct cifsFileInfo), GFP_KERNEL); | |
268 | if (cifsFile == NULL) { | |
269 | rc = -ENOMEM; | |
270 | goto error_exit; | |
271 | } | |
272 | file->private_data = cifsFile; | |
273 | cifsFile->tlink = cifs_get_tlink(tlink); | |
29e20f9c | 274 | tcon = tlink_tcon(tlink); |
59c55ba1 JL |
275 | } else { |
276 | cifsFile = file->private_data; | |
29e20f9c | 277 | tcon = tlink_tcon(cifsFile->tlink); |
7ffec372 | 278 | } |
1da177e4 | 279 | |
92fc65a7 PS |
280 | server = tcon->ses->server; |
281 | ||
282 | if (!server->ops->query_dir_first) { | |
283 | rc = -ENOSYS; | |
284 | goto error_exit; | |
285 | } | |
286 | ||
4b18f2a9 SF |
287 | cifsFile->invalidHandle = true; |
288 | cifsFile->srch_inf.endOfSearch = false; | |
1da177e4 | 289 | |
e6a00296 | 290 | full_path = build_path_from_dentry(file->f_path.dentry); |
7ffec372 JL |
291 | if (full_path == NULL) { |
292 | rc = -ENOMEM; | |
293 | goto error_exit; | |
294 | } | |
1da177e4 | 295 | |
f96637be | 296 | cifs_dbg(FYI, "Full path: %s start at: %lld\n", full_path, file->f_pos); |
1da177e4 | 297 | |
75cf6bdc | 298 | ffirst_retry: |
1da177e4 | 299 | /* test for Unix extensions */ |
c18c842b | 300 | /* but now check for them on the share/mount not on the SMB session */ |
29e20f9c PS |
301 | /* if (cap_unix(tcon->ses) { */ |
302 | if (tcon->unix_ext) | |
5bafd765 | 303 | cifsFile->srch_inf.info_level = SMB_FIND_FILE_UNIX; |
29e20f9c PS |
304 | else if ((tcon->ses->capabilities & |
305 | tcon->ses->server->vals->cap_nt_find) == 0) { | |
5bafd765 | 306 | cifsFile->srch_inf.info_level = SMB_FIND_FILE_INFO_STANDARD; |
1da177e4 LT |
307 | } else if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM) { |
308 | cifsFile->srch_inf.info_level = SMB_FIND_FILE_ID_FULL_DIR_INFO; | |
309 | } else /* not srvinos - BB fixme add check for backlevel? */ { | |
310 | cifsFile->srch_inf.info_level = SMB_FIND_FILE_DIRECTORY_INFO; | |
311 | } | |
312 | ||
2608bee7 SP |
313 | search_flags = CIFS_SEARCH_CLOSE_AT_END | CIFS_SEARCH_RETURN_RESUME; |
314 | if (backup_cred(cifs_sb)) | |
315 | search_flags |= CIFS_SEARCH_BACKUP_SEARCH; | |
316 | ||
92fc65a7 PS |
317 | rc = server->ops->query_dir_first(xid, tcon, full_path, cifs_sb, |
318 | &cifsFile->fid, search_flags, | |
319 | &cifsFile->srch_inf); | |
320 | ||
4523cc30 | 321 | if (rc == 0) |
4b18f2a9 | 322 | cifsFile->invalidHandle = false; |
e836f015 | 323 | /* BB add following call to handle readdir on new NTFS symlink errors |
0e0d2cf3 SF |
324 | else if STATUS_STOPPED_ON_SYMLINK |
325 | call get_symlink_reparse_path and retry with new path */ | |
326 | else if ((rc == -EOPNOTSUPP) && | |
75cf6bdc SF |
327 | (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM)) { |
328 | cifs_sb->mnt_cifs_flags &= ~CIFS_MOUNT_SERVER_INUM; | |
329 | goto ffirst_retry; | |
330 | } | |
7ffec372 | 331 | error_exit: |
1da177e4 | 332 | kfree(full_path); |
7ffec372 | 333 | cifs_put_tlink(tlink); |
1da177e4 LT |
334 | return rc; |
335 | } | |
336 | ||
337 | /* return length of unicode string in bytes */ | |
cda0ec6a | 338 | static int cifs_unicode_bytelen(const char *str) |
1da177e4 LT |
339 | { |
340 | int len; | |
cda0ec6a | 341 | const __le16 *ustr = (const __le16 *)str; |
1da177e4 | 342 | |
3870253e | 343 | for (len = 0; len <= PATH_MAX; len++) { |
4523cc30 | 344 | if (ustr[len] == 0) |
1da177e4 LT |
345 | return len << 1; |
346 | } | |
f96637be | 347 | cifs_dbg(FYI, "Unicode string longer than PATH_MAX found\n"); |
1da177e4 LT |
348 | return len << 1; |
349 | } | |
350 | ||
5bafd765 | 351 | static char *nxt_dir_entry(char *old_entry, char *end_of_smb, int level) |
1da177e4 | 352 | { |
3870253e | 353 | char *new_entry; |
ad7a2926 | 354 | FILE_DIRECTORY_INFO *pDirInfo = (FILE_DIRECTORY_INFO *)old_entry; |
1da177e4 | 355 | |
4523cc30 | 356 | if (level == SMB_FIND_FILE_INFO_STANDARD) { |
ad7a2926 | 357 | FIND_FILE_STANDARD_INFO *pfData; |
5bafd765 SF |
358 | pfData = (FIND_FILE_STANDARD_INFO *)pDirInfo; |
359 | ||
360 | new_entry = old_entry + sizeof(FIND_FILE_STANDARD_INFO) + | |
361 | pfData->FileNameLength; | |
362 | } else | |
363 | new_entry = old_entry + le32_to_cpu(pDirInfo->NextEntryOffset); | |
f96637be | 364 | cifs_dbg(FYI, "new entry %p old entry %p\n", new_entry, old_entry); |
1da177e4 | 365 | /* validate that new_entry is not past end of SMB */ |
4523cc30 | 366 | if (new_entry >= end_of_smb) { |
f96637be JP |
367 | cifs_dbg(VFS, "search entry %p began after end of SMB %p old entry %p\n", |
368 | new_entry, end_of_smb, old_entry); | |
1da177e4 | 369 | return NULL; |
4523cc30 | 370 | } else if (((level == SMB_FIND_FILE_INFO_STANDARD) && |
3870253e SF |
371 | (new_entry + sizeof(FIND_FILE_STANDARD_INFO) > end_of_smb)) |
372 | || ((level != SMB_FIND_FILE_INFO_STANDARD) && | |
5bafd765 | 373 | (new_entry + sizeof(FILE_DIRECTORY_INFO) > end_of_smb))) { |
f96637be JP |
374 | cifs_dbg(VFS, "search entry %p extends after end of SMB %p\n", |
375 | new_entry, end_of_smb); | |
09d1db5c | 376 | return NULL; |
3870253e | 377 | } else |
1da177e4 LT |
378 | return new_entry; |
379 | ||
380 | } | |
381 | ||
cda0ec6a CH |
382 | struct cifs_dirent { |
383 | const char *name; | |
384 | size_t namelen; | |
385 | u32 resume_key; | |
386 | u64 ino; | |
387 | }; | |
388 | ||
389 | static void cifs_fill_dirent_unix(struct cifs_dirent *de, | |
390 | const FILE_UNIX_INFO *info, bool is_unicode) | |
391 | { | |
392 | de->name = &info->FileName[0]; | |
393 | if (is_unicode) | |
394 | de->namelen = cifs_unicode_bytelen(de->name); | |
395 | else | |
396 | de->namelen = strnlen(de->name, PATH_MAX); | |
397 | de->resume_key = info->ResumeKey; | |
398 | de->ino = le64_to_cpu(info->basic.UniqueId); | |
399 | } | |
400 | ||
401 | static void cifs_fill_dirent_dir(struct cifs_dirent *de, | |
402 | const FILE_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_full(struct cifs_dirent *de, | |
410 | const FILE_FULL_DIRECTORY_INFO *info) | |
411 | { | |
412 | de->name = &info->FileName[0]; | |
413 | de->namelen = le32_to_cpu(info->FileNameLength); | |
414 | de->resume_key = info->FileIndex; | |
415 | } | |
416 | ||
417 | static void cifs_fill_dirent_search(struct cifs_dirent *de, | |
418 | const SEARCH_ID_FULL_DIR_INFO *info) | |
419 | { | |
420 | de->name = &info->FileName[0]; | |
421 | de->namelen = le32_to_cpu(info->FileNameLength); | |
422 | de->resume_key = info->FileIndex; | |
423 | de->ino = le64_to_cpu(info->UniqueId); | |
424 | } | |
425 | ||
426 | static void cifs_fill_dirent_both(struct cifs_dirent *de, | |
427 | const FILE_BOTH_DIRECTORY_INFO *info) | |
428 | { | |
429 | de->name = &info->FileName[0]; | |
430 | de->namelen = le32_to_cpu(info->FileNameLength); | |
431 | de->resume_key = info->FileIndex; | |
432 | } | |
433 | ||
434 | static void cifs_fill_dirent_std(struct cifs_dirent *de, | |
435 | const FIND_FILE_STANDARD_INFO *info) | |
436 | { | |
437 | de->name = &info->FileName[0]; | |
438 | /* one byte length, no endianess conversion */ | |
439 | de->namelen = info->FileNameLength; | |
440 | de->resume_key = info->ResumeKey; | |
441 | } | |
442 | ||
443 | static int cifs_fill_dirent(struct cifs_dirent *de, const void *info, | |
444 | u16 level, bool is_unicode) | |
445 | { | |
446 | memset(de, 0, sizeof(*de)); | |
447 | ||
448 | switch (level) { | |
449 | case SMB_FIND_FILE_UNIX: | |
450 | cifs_fill_dirent_unix(de, info, is_unicode); | |
451 | break; | |
452 | case SMB_FIND_FILE_DIRECTORY_INFO: | |
453 | cifs_fill_dirent_dir(de, info); | |
454 | break; | |
455 | case SMB_FIND_FILE_FULL_DIRECTORY_INFO: | |
456 | cifs_fill_dirent_full(de, info); | |
457 | break; | |
458 | case SMB_FIND_FILE_ID_FULL_DIR_INFO: | |
459 | cifs_fill_dirent_search(de, info); | |
460 | break; | |
461 | case SMB_FIND_FILE_BOTH_DIRECTORY_INFO: | |
462 | cifs_fill_dirent_both(de, info); | |
463 | break; | |
464 | case SMB_FIND_FILE_INFO_STANDARD: | |
465 | cifs_fill_dirent_std(de, info); | |
466 | break; | |
467 | default: | |
f96637be | 468 | cifs_dbg(FYI, "Unknown findfirst level %d\n", level); |
cda0ec6a CH |
469 | return -EINVAL; |
470 | } | |
471 | ||
472 | return 0; | |
473 | } | |
474 | ||
1da177e4 LT |
475 | #define UNICODE_DOT cpu_to_le16(0x2e) |
476 | ||
477 | /* return 0 if no match and 1 for . (current directory) and 2 for .. (parent) */ | |
cda0ec6a | 478 | static int cifs_entry_is_dot(struct cifs_dirent *de, bool is_unicode) |
1da177e4 LT |
479 | { |
480 | int rc = 0; | |
1da177e4 | 481 | |
cda0ec6a CH |
482 | if (!de->name) |
483 | return 0; | |
1da177e4 | 484 | |
cda0ec6a CH |
485 | if (is_unicode) { |
486 | __le16 *ufilename = (__le16 *)de->name; | |
487 | if (de->namelen == 2) { | |
488 | /* check for . */ | |
489 | if (ufilename[0] == UNICODE_DOT) | |
490 | rc = 1; | |
491 | } else if (de->namelen == 4) { | |
492 | /* check for .. */ | |
493 | if (ufilename[0] == UNICODE_DOT && | |
494 | ufilename[1] == UNICODE_DOT) | |
495 | rc = 2; | |
496 | } | |
497 | } else /* ASCII */ { | |
498 | if (de->namelen == 1) { | |
499 | if (de->name[0] == '.') | |
500 | rc = 1; | |
501 | } else if (de->namelen == 2) { | |
502 | if (de->name[0] == '.' && de->name[1] == '.') | |
503 | rc = 2; | |
1da177e4 LT |
504 | } |
505 | } | |
506 | ||
507 | return rc; | |
508 | } | |
509 | ||
eafe8701 SF |
510 | /* Check if directory that we are searching has changed so we can decide |
511 | whether we can use the cached search results from the previous search */ | |
3870253e | 512 | static int is_dir_changed(struct file *file) |
eafe8701 | 513 | { |
496ad9aa | 514 | struct inode *inode = file_inode(file); |
c33f8d32 | 515 | struct cifsInodeInfo *cifsInfo = CIFS_I(inode); |
eafe8701 | 516 | |
c33f8d32 | 517 | if (cifsInfo->time == 0) |
eafe8701 SF |
518 | return 1; /* directory was changed, perhaps due to unlink */ |
519 | else | |
520 | return 0; | |
521 | ||
522 | } | |
523 | ||
0752f152 | 524 | static int cifs_save_resume_key(const char *current_entry, |
eaf35b1e | 525 | struct cifsFileInfo *file_info) |
0752f152 | 526 | { |
eaf35b1e CH |
527 | struct cifs_dirent de; |
528 | int rc; | |
0752f152 | 529 | |
eaf35b1e CH |
530 | rc = cifs_fill_dirent(&de, current_entry, file_info->srch_inf.info_level, |
531 | file_info->srch_inf.unicode); | |
532 | if (!rc) { | |
533 | file_info->srch_inf.presume_name = de.name; | |
534 | file_info->srch_inf.resume_name_len = de.namelen; | |
535 | file_info->srch_inf.resume_key = de.resume_key; | |
0752f152 | 536 | } |
0752f152 SF |
537 | return rc; |
538 | } | |
539 | ||
92fc65a7 PS |
540 | /* |
541 | * Find the corresponding entry in the search. Note that the SMB server returns | |
542 | * search entries for . and .. which complicates logic here if we choose to | |
543 | * parse for them and we do not assume that they are located in the findfirst | |
544 | * return buffer. We start counting in the buffer with entry 2 and increment for | |
545 | * every entry (do not increment for . or .. entry). | |
546 | */ | |
547 | static int | |
548 | find_cifs_entry(const unsigned int xid, struct cifs_tcon *tcon, | |
549 | struct file *file, char **current_entry, int *num_to_ret) | |
1da177e4 | 550 | { |
2608bee7 | 551 | __u16 search_flags; |
1da177e4 LT |
552 | int rc = 0; |
553 | int pos_in_buf = 0; | |
554 | loff_t first_entry_in_buffer; | |
555 | loff_t index_to_find = file->f_pos; | |
92fc65a7 | 556 | struct cifsFileInfo *cfile = file->private_data; |
2608bee7 | 557 | struct cifs_sb_info *cifs_sb = CIFS_SB(file->f_path.dentry->d_sb); |
92fc65a7 | 558 | struct TCP_Server_Info *server = tcon->ses->server; |
1da177e4 | 559 | /* check if index in the buffer */ |
50c2f753 | 560 | |
92fc65a7 PS |
561 | if (!server->ops->query_dir_first || !server->ops->query_dir_next) |
562 | return -ENOSYS; | |
563 | ||
564 | if ((cfile == NULL) || (current_entry == NULL) || (num_to_ret == NULL)) | |
1da177e4 | 565 | return -ENOENT; |
50c2f753 | 566 | |
92fc65a7 PS |
567 | *current_entry = NULL; |
568 | first_entry_in_buffer = cfile->srch_inf.index_of_last_entry - | |
569 | cfile->srch_inf.entries_in_buffer; | |
60808233 | 570 | |
92fc65a7 PS |
571 | /* |
572 | * If first entry in buf is zero then is first buffer | |
573 | * in search response data which means it is likely . and .. | |
574 | * will be in this buffer, although some servers do not return | |
575 | * . and .. for the root of a drive and for those we need | |
576 | * to start two entries earlier. | |
577 | */ | |
60808233 | 578 | |
3979877e | 579 | dump_cifs_file_struct(file, "In fce "); |
92fc65a7 PS |
580 | if (((index_to_find < cfile->srch_inf.index_of_last_entry) && |
581 | is_dir_changed(file)) || (index_to_find < first_entry_in_buffer)) { | |
1da177e4 | 582 | /* close and restart search */ |
f96637be | 583 | cifs_dbg(FYI, "search backing up - close and restart search\n"); |
4477288a | 584 | spin_lock(&cifs_file_list_lock); |
92fc65a7 PS |
585 | if (!cfile->srch_inf.endOfSearch && !cfile->invalidHandle) { |
586 | cfile->invalidHandle = true; | |
4477288a | 587 | spin_unlock(&cifs_file_list_lock); |
659c6399 PS |
588 | if (server->ops->close_dir) |
589 | server->ops->close_dir(xid, tcon, &cfile->fid); | |
ddb4cbfc | 590 | } else |
4477288a | 591 | spin_unlock(&cifs_file_list_lock); |
92fc65a7 | 592 | if (cfile->srch_inf.ntwrk_buf_start) { |
f96637be | 593 | cifs_dbg(FYI, "freeing SMB ff cache buf on search rewind\n"); |
92fc65a7 PS |
594 | if (cfile->srch_inf.smallBuf) |
595 | cifs_small_buf_release(cfile->srch_inf. | |
d47d7c1a SF |
596 | ntwrk_buf_start); |
597 | else | |
92fc65a7 | 598 | cifs_buf_release(cfile->srch_inf. |
d47d7c1a | 599 | ntwrk_buf_start); |
92fc65a7 | 600 | cfile->srch_inf.ntwrk_buf_start = NULL; |
1da177e4 | 601 | } |
3870253e | 602 | rc = initiate_cifs_search(xid, file); |
4523cc30 | 603 | if (rc) { |
f96637be | 604 | cifs_dbg(FYI, "error %d reinitiating a search on rewind\n", |
b6b38f70 | 605 | rc); |
1da177e4 LT |
606 | return rc; |
607 | } | |
7023676f | 608 | /* FindFirst/Next set last_entry to NULL on malformed reply */ |
92fc65a7 PS |
609 | if (cfile->srch_inf.last_entry) |
610 | cifs_save_resume_key(cfile->srch_inf.last_entry, cfile); | |
1da177e4 LT |
611 | } |
612 | ||
2608bee7 SP |
613 | search_flags = CIFS_SEARCH_CLOSE_AT_END | CIFS_SEARCH_RETURN_RESUME; |
614 | if (backup_cred(cifs_sb)) | |
615 | search_flags |= CIFS_SEARCH_BACKUP_SEARCH; | |
616 | ||
92fc65a7 PS |
617 | while ((index_to_find >= cfile->srch_inf.index_of_last_entry) && |
618 | (rc == 0) && !cfile->srch_inf.endOfSearch) { | |
f96637be | 619 | cifs_dbg(FYI, "calling findnext2\n"); |
92fc65a7 PS |
620 | rc = server->ops->query_dir_next(xid, tcon, &cfile->fid, |
621 | search_flags, | |
622 | &cfile->srch_inf); | |
7023676f | 623 | /* FindFirst/Next set last_entry to NULL on malformed reply */ |
92fc65a7 PS |
624 | if (cfile->srch_inf.last_entry) |
625 | cifs_save_resume_key(cfile->srch_inf.last_entry, cfile); | |
4523cc30 | 626 | if (rc) |
1da177e4 LT |
627 | return -ENOENT; |
628 | } | |
92fc65a7 | 629 | if (index_to_find < cfile->srch_inf.index_of_last_entry) { |
1da177e4 LT |
630 | /* we found the buffer that contains the entry */ |
631 | /* scan and find it */ | |
632 | int i; | |
92fc65a7 PS |
633 | char *cur_ent; |
634 | char *end_of_smb = cfile->srch_inf.ntwrk_buf_start + | |
635 | server->ops->calc_smb_size( | |
636 | cfile->srch_inf.ntwrk_buf_start); | |
637 | ||
638 | cur_ent = cfile->srch_inf.srch_entries_start; | |
639 | first_entry_in_buffer = cfile->srch_inf.index_of_last_entry | |
640 | - cfile->srch_inf.entries_in_buffer; | |
1da177e4 | 641 | pos_in_buf = index_to_find - first_entry_in_buffer; |
f96637be | 642 | cifs_dbg(FYI, "found entry - pos_in_buf %d\n", pos_in_buf); |
5bafd765 | 643 | |
92fc65a7 | 644 | for (i = 0; (i < (pos_in_buf)) && (cur_ent != NULL); i++) { |
dfb7533b | 645 | /* go entry by entry figuring out which is first */ |
92fc65a7 PS |
646 | cur_ent = nxt_dir_entry(cur_ent, end_of_smb, |
647 | cfile->srch_inf.info_level); | |
1da177e4 | 648 | } |
92fc65a7 | 649 | if ((cur_ent == NULL) && (i < pos_in_buf)) { |
1da177e4 | 650 | /* BB fixme - check if we should flag this error */ |
f96637be JP |
651 | cifs_dbg(VFS, "reached end of buf searching for pos in buf %d index to find %lld rc %d\n", |
652 | pos_in_buf, index_to_find, rc); | |
1da177e4 LT |
653 | } |
654 | rc = 0; | |
92fc65a7 | 655 | *current_entry = cur_ent; |
1da177e4 | 656 | } else { |
f96637be | 657 | cifs_dbg(FYI, "index not in buffer - could not findnext into it\n"); |
1da177e4 LT |
658 | return 0; |
659 | } | |
660 | ||
92fc65a7 | 661 | if (pos_in_buf >= cfile->srch_inf.entries_in_buffer) { |
f96637be | 662 | cifs_dbg(FYI, "can not return entries pos_in_buf beyond last\n"); |
1da177e4 LT |
663 | *num_to_ret = 0; |
664 | } else | |
92fc65a7 | 665 | *num_to_ret = cfile->srch_inf.entries_in_buffer - pos_in_buf; |
1da177e4 LT |
666 | |
667 | return rc; | |
668 | } | |
669 | ||
9feed6f8 CH |
670 | static int cifs_filldir(char *find_entry, struct file *file, filldir_t filldir, |
671 | void *dirent, char *scratch_buf, unsigned int max_len) | |
1da177e4 | 672 | { |
9feed6f8 CH |
673 | struct cifsFileInfo *file_info = file->private_data; |
674 | struct super_block *sb = file->f_path.dentry->d_sb; | |
675 | struct cifs_sb_info *cifs_sb = CIFS_SB(sb); | |
cda0ec6a | 676 | struct cifs_dirent de = { NULL, }; |
cc0bad75 | 677 | struct cifs_fattr fattr; |
9feed6f8 | 678 | struct qstr name; |
1da177e4 | 679 | int rc = 0; |
9feed6f8 | 680 | ino_t ino; |
1da177e4 | 681 | |
cda0ec6a CH |
682 | rc = cifs_fill_dirent(&de, find_entry, file_info->srch_inf.info_level, |
683 | file_info->srch_inf.unicode); | |
684 | if (rc) | |
685 | return rc; | |
5bafd765 | 686 | |
f16d59b4 | 687 | if (de.namelen > max_len) { |
f96637be JP |
688 | cifs_dbg(VFS, "bad search response length %zd past smb end\n", |
689 | de.namelen); | |
5bafd765 SF |
690 | return -EINVAL; |
691 | } | |
692 | ||
60808233 | 693 | /* skip . and .. since we added them first */ |
cda0ec6a | 694 | if (cifs_entry_is_dot(&de, file_info->srch_inf.unicode)) |
60808233 SF |
695 | return 0; |
696 | ||
f16d59b4 CH |
697 | if (file_info->srch_inf.unicode) { |
698 | struct nls_table *nlt = cifs_sb->local_nls; | |
1da177e4 | 699 | |
f16d59b4 CH |
700 | name.name = scratch_buf; |
701 | name.len = | |
acbbb76a SF |
702 | cifs_from_utf16((char *)name.name, (__le16 *)de.name, |
703 | UNICODE_NAME_MAX, | |
704 | min_t(size_t, de.namelen, | |
705 | (size_t)max_len), nlt, | |
706 | cifs_sb->mnt_cifs_flags & | |
f16d59b4 CH |
707 | CIFS_MOUNT_MAP_SPECIAL_CHR); |
708 | name.len -= nls_nullsize(nlt); | |
709 | } else { | |
710 | name.name = de.name; | |
711 | name.len = de.namelen; | |
712 | } | |
1da177e4 | 713 | |
9feed6f8 CH |
714 | switch (file_info->srch_inf.info_level) { |
715 | case SMB_FIND_FILE_UNIX: | |
cc0bad75 | 716 | cifs_unix_basic_to_fattr(&fattr, |
9feed6f8 CH |
717 | &((FILE_UNIX_INFO *)find_entry)->basic, |
718 | cifs_sb); | |
719 | break; | |
720 | case SMB_FIND_FILE_INFO_STANDARD: | |
721 | cifs_std_info_to_fattr(&fattr, | |
722 | (FIND_FILE_STANDARD_INFO *)find_entry, | |
723 | cifs_sb); | |
724 | break; | |
725 | default: | |
726 | cifs_dir_info_to_fattr(&fattr, | |
727 | (FILE_DIRECTORY_INFO *)find_entry, | |
728 | cifs_sb); | |
729 | break; | |
730 | } | |
b835bebe | 731 | |
f16d59b4 CH |
732 | if (de.ino && (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM)) { |
733 | fattr.cf_uniqueid = de.ino; | |
ec06aedd | 734 | } else { |
0b8f18e3 | 735 | fattr.cf_uniqueid = iunique(sb, ROOT_I); |
ec06aedd JL |
736 | cifs_autodisable_serverino(cifs_sb); |
737 | } | |
50c2f753 | 738 | |
1b12b9c1 SM |
739 | if ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MF_SYMLINKS) && |
740 | CIFSCouldBeMFSymlink(&fattr)) | |
741 | /* | |
742 | * trying to get the type and mode can be slow, | |
743 | * so just call those regular files for now, and mark | |
744 | * for reval | |
745 | */ | |
746 | fattr.cf_flags |= CIFS_FATTR_NEED_REVAL; | |
747 | ||
eb1b3fa5 | 748 | cifs_prime_dcache(file->f_dentry, &name, &fattr); |
3870253e | 749 | |
eb1b3fa5 | 750 | ino = cifs_uniqueid_to_ino_t(fattr.cf_uniqueid); |
9feed6f8 CH |
751 | rc = filldir(dirent, name.name, name.len, file->f_pos, ino, |
752 | fattr.cf_dtype); | |
1da177e4 LT |
753 | return rc; |
754 | } | |
755 | ||
1da177e4 LT |
756 | |
757 | int cifs_readdir(struct file *file, void *direntry, filldir_t filldir) | |
758 | { | |
759 | int rc = 0; | |
6d5786a3 PS |
760 | unsigned int xid; |
761 | int i; | |
92fc65a7 | 762 | struct cifs_tcon *tcon; |
1da177e4 | 763 | struct cifsFileInfo *cifsFile = NULL; |
3870253e | 764 | char *current_entry; |
1da177e4 | 765 | int num_to_fill = 0; |
3870253e | 766 | char *tmp_buf = NULL; |
50c2f753 | 767 | char *end_of_smb; |
18295796 | 768 | unsigned int max_len; |
1da177e4 | 769 | |
6d5786a3 | 770 | xid = get_xid(); |
1da177e4 | 771 | |
6221ddd0 SJ |
772 | /* |
773 | * Ensure FindFirst doesn't fail before doing filldir() for '.' and | |
774 | * '..'. Otherwise we won't be able to notify VFS in case of failure. | |
775 | */ | |
776 | if (file->private_data == NULL) { | |
777 | rc = initiate_cifs_search(xid, file); | |
f96637be | 778 | cifs_dbg(FYI, "initiate cifs search rc %d\n", rc); |
6221ddd0 SJ |
779 | if (rc) |
780 | goto rddir2_exit; | |
781 | } | |
782 | ||
1da177e4 LT |
783 | switch ((int) file->f_pos) { |
784 | case 0: | |
60808233 | 785 | if (filldir(direntry, ".", 1, file->f_pos, |
496ad9aa | 786 | file_inode(file)->i_ino, DT_DIR) < 0) { |
f96637be | 787 | cifs_dbg(VFS, "Filldir for current dir failed\n"); |
1da177e4 LT |
788 | rc = -ENOMEM; |
789 | break; | |
790 | } | |
60808233 | 791 | file->f_pos++; |
1da177e4 | 792 | case 1: |
60808233 | 793 | if (filldir(direntry, "..", 2, file->f_pos, |
b85fd6bd | 794 | parent_ino(file->f_path.dentry), DT_DIR) < 0) { |
f96637be | 795 | cifs_dbg(VFS, "Filldir for parent dir failed\n"); |
1da177e4 LT |
796 | rc = -ENOMEM; |
797 | break; | |
798 | } | |
60808233 SF |
799 | file->f_pos++; |
800 | default: | |
3870253e SF |
801 | /* 1) If search is active, |
802 | is in current search buffer? | |
1da177e4 LT |
803 | if it before then restart search |
804 | if after then keep searching till find it */ | |
805 | ||
790fe579 | 806 | if (file->private_data == NULL) { |
1da177e4 | 807 | rc = -EINVAL; |
6d5786a3 | 808 | free_xid(xid); |
1da177e4 LT |
809 | return rc; |
810 | } | |
811 | cifsFile = file->private_data; | |
812 | if (cifsFile->srch_inf.endOfSearch) { | |
790fe579 | 813 | if (cifsFile->srch_inf.emptyDir) { |
f96637be | 814 | cifs_dbg(FYI, "End of search, empty dir\n"); |
1da177e4 LT |
815 | rc = 0; |
816 | break; | |
817 | } | |
818 | } /* else { | |
4b18f2a9 | 819 | cifsFile->invalidHandle = true; |
92fc65a7 | 820 | tcon->ses->server->close(xid, tcon, &cifsFile->fid); |
aaa9bbe0 | 821 | } */ |
1da177e4 | 822 | |
92fc65a7 PS |
823 | tcon = tlink_tcon(cifsFile->tlink); |
824 | rc = find_cifs_entry(xid, tcon, file, ¤t_entry, | |
825 | &num_to_fill); | |
790fe579 | 826 | if (rc) { |
f96637be | 827 | cifs_dbg(FYI, "fce error %d\n", rc); |
1da177e4 LT |
828 | goto rddir2_exit; |
829 | } else if (current_entry != NULL) { | |
f96637be | 830 | cifs_dbg(FYI, "entry %lld found\n", file->f_pos); |
1da177e4 | 831 | } else { |
f96637be | 832 | cifs_dbg(FYI, "could not find entry\n"); |
1da177e4 LT |
833 | goto rddir2_exit; |
834 | } | |
f96637be JP |
835 | cifs_dbg(FYI, "loop through %d times filling dir for net buf %p\n", |
836 | num_to_fill, cifsFile->srch_inf.ntwrk_buf_start); | |
92fc65a7 | 837 | max_len = tcon->ses->server->ops->calc_smb_size( |
5bafd765 SF |
838 | cifsFile->srch_inf.ntwrk_buf_start); |
839 | end_of_smb = cifsFile->srch_inf.ntwrk_buf_start + max_len; | |
840 | ||
f5884166 | 841 | tmp_buf = kmalloc(UNICODE_NAME_MAX, GFP_KERNEL); |
f55fdcca KV |
842 | if (tmp_buf == NULL) { |
843 | rc = -ENOMEM; | |
844 | break; | |
845 | } | |
846 | ||
790fe579 SF |
847 | for (i = 0; (i < num_to_fill) && (rc == 0); i++) { |
848 | if (current_entry == NULL) { | |
1da177e4 | 849 | /* evaluate whether this case is an error */ |
f96637be JP |
850 | cifs_dbg(VFS, "past SMB end, num to fill %d i %d\n", |
851 | num_to_fill, i); | |
1da177e4 LT |
852 | break; |
853 | } | |
92fc65a7 PS |
854 | /* |
855 | * if buggy server returns . and .. late do we want to | |
856 | * check for that here? | |
857 | */ | |
858 | rc = cifs_filldir(current_entry, file, filldir, | |
859 | direntry, tmp_buf, max_len); | |
790fe579 | 860 | if (rc == -EOVERFLOW) { |
7ca85ba7 SF |
861 | rc = 0; |
862 | break; | |
863 | } | |
864 | ||
1da177e4 | 865 | file->f_pos++; |
790fe579 | 866 | if (file->f_pos == |
3979877e | 867 | cifsFile->srch_inf.index_of_last_entry) { |
f96637be JP |
868 | cifs_dbg(FYI, "last entry in buf at pos %lld %s\n", |
869 | file->f_pos, tmp_buf); | |
790fe579 | 870 | cifs_save_resume_key(current_entry, cifsFile); |
1da177e4 | 871 | break; |
790fe579 SF |
872 | } else |
873 | current_entry = | |
5bafd765 SF |
874 | nxt_dir_entry(current_entry, end_of_smb, |
875 | cifsFile->srch_inf.info_level); | |
1da177e4 LT |
876 | } |
877 | kfree(tmp_buf); | |
878 | break; | |
879 | } /* end switch */ | |
880 | ||
881 | rddir2_exit: | |
6d5786a3 | 882 | free_xid(xid); |
1da177e4 LT |
883 | return rc; |
884 | } |