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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 | 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 | |
eb1b3fa5 | 83 | cFYI(1, "%s: for %s", __func__, name->name); |
cc0bad75 | 84 | |
05507fa2 | 85 | if (parent->d_op && parent->d_op->d_hash) |
b1e6a015 | 86 | parent->d_op->d_hash(parent, parent->d_inode, name); |
05507fa2 JL |
87 | else |
88 | name->hash = full_name_hash(name->name, name->len); | |
89 | ||
cc0bad75 JL |
90 | dentry = d_lookup(parent, name); |
91 | if (dentry) { | |
0903a0c8 | 92 | int err; |
eb1b3fa5 | 93 | |
cd60042c | 94 | inode = dentry->d_inode; |
2f2591a3 JL |
95 | if (inode) { |
96 | /* | |
97 | * If we're generating inode numbers, then we don't | |
98 | * want to clobber the existing one with the one that | |
99 | * the readdir code created. | |
100 | */ | |
101 | if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM)) | |
102 | fattr->cf_uniqueid = CIFS_I(inode)->uniqueid; | |
103 | ||
104 | /* update inode in place if i_ino didn't change */ | |
105 | if (CIFS_I(inode)->uniqueid == fattr->cf_uniqueid) { | |
106 | cifs_fattr_to_inode(inode, fattr); | |
107 | goto out; | |
108 | } | |
cd60042c | 109 | } |
0903a0c8 | 110 | err = d_invalidate(dentry); |
cc0bad75 | 111 | dput(dentry); |
0903a0c8 | 112 | if (err) |
eb1b3fa5 | 113 | return; |
cc0bad75 JL |
114 | } |
115 | ||
116 | dentry = d_alloc(parent, name); | |
eb1b3fa5 JL |
117 | if (!dentry) |
118 | return; | |
cc0bad75 JL |
119 | |
120 | inode = cifs_iget(sb, fattr); | |
eb1b3fa5 JL |
121 | if (!inode) |
122 | goto out; | |
cc0bad75 | 123 | |
cc0bad75 | 124 | alias = d_materialise_unique(dentry, inode); |
eb1b3fa5 JL |
125 | if (alias && !IS_ERR(alias)) |
126 | dput(alias); | |
127 | out: | |
128 | dput(dentry); | |
cc0bad75 JL |
129 | } |
130 | ||
0b8f18e3 JL |
131 | static void |
132 | cifs_fill_common_info(struct cifs_fattr *fattr, struct cifs_sb_info *cifs_sb) | |
1da177e4 | 133 | { |
0b8f18e3 JL |
134 | fattr->cf_uid = cifs_sb->mnt_uid; |
135 | fattr->cf_gid = cifs_sb->mnt_gid; | |
1da177e4 | 136 | |
0b8f18e3 JL |
137 | if (fattr->cf_cifsattrs & ATTR_DIRECTORY) { |
138 | fattr->cf_mode = S_IFDIR | cifs_sb->mnt_dir_mode; | |
139 | fattr->cf_dtype = DT_DIR; | |
1da177e4 | 140 | } else { |
0b8f18e3 JL |
141 | fattr->cf_mode = S_IFREG | cifs_sb->mnt_file_mode; |
142 | fattr->cf_dtype = DT_REG; | |
1da177e4 LT |
143 | } |
144 | ||
0b8f18e3 JL |
145 | if (fattr->cf_cifsattrs & ATTR_READONLY) |
146 | fattr->cf_mode &= ~S_IWUGO; | |
5bafd765 | 147 | |
ccb5c001 JL |
148 | /* |
149 | * We of course don't get ACL info in FIND_FIRST/NEXT results, so | |
150 | * mark it for revalidation so that "ls -l" will look right. It might | |
151 | * be super-slow, but if we don't do this then the ownership of files | |
152 | * may look wrong since the inodes may not have timed out by the time | |
153 | * "ls" does a stat() call on them. | |
154 | */ | |
155 | if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_CIFS_ACL) | |
156 | fattr->cf_flags |= CIFS_FATTR_NEED_REVAL; | |
157 | ||
0b8f18e3 JL |
158 | if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_UNX_EMUL && |
159 | fattr->cf_cifsattrs & ATTR_SYSTEM) { | |
160 | if (fattr->cf_eof == 0) { | |
161 | fattr->cf_mode &= ~S_IFMT; | |
162 | fattr->cf_mode |= S_IFIFO; | |
163 | fattr->cf_dtype = DT_FIFO; | |
3020a1f5 | 164 | } else { |
4468eb3f | 165 | /* |
0b8f18e3 JL |
166 | * trying to get the type and mode via SFU can be slow, |
167 | * so just call those regular files for now, and mark | |
168 | * for reval | |
4468eb3f | 169 | */ |
0b8f18e3 | 170 | fattr->cf_flags |= CIFS_FATTR_NEED_REVAL; |
4468eb3f JL |
171 | } |
172 | } | |
0b8f18e3 | 173 | } |
1da177e4 | 174 | |
c052e2b4 | 175 | void |
0b8f18e3 JL |
176 | cifs_dir_info_to_fattr(struct cifs_fattr *fattr, FILE_DIRECTORY_INFO *info, |
177 | struct cifs_sb_info *cifs_sb) | |
178 | { | |
179 | memset(fattr, 0, sizeof(*fattr)); | |
180 | fattr->cf_cifsattrs = le32_to_cpu(info->ExtFileAttributes); | |
181 | fattr->cf_eof = le64_to_cpu(info->EndOfFile); | |
182 | fattr->cf_bytes = le64_to_cpu(info->AllocationSize); | |
20054bd6 | 183 | fattr->cf_createtime = le64_to_cpu(info->CreationTime); |
0b8f18e3 JL |
184 | fattr->cf_atime = cifs_NTtimeToUnix(info->LastAccessTime); |
185 | fattr->cf_ctime = cifs_NTtimeToUnix(info->ChangeTime); | |
186 | fattr->cf_mtime = cifs_NTtimeToUnix(info->LastWriteTime); | |
187 | ||
188 | cifs_fill_common_info(fattr, cifs_sb); | |
189 | } | |
1da177e4 | 190 | |
15dd4781 | 191 | static void |
0b8f18e3 JL |
192 | cifs_std_info_to_fattr(struct cifs_fattr *fattr, FIND_FILE_STANDARD_INFO *info, |
193 | struct cifs_sb_info *cifs_sb) | |
194 | { | |
0d424ad0 | 195 | int offset = cifs_sb_master_tcon(cifs_sb)->ses->server->timeAdj; |
1da177e4 | 196 | |
0b8f18e3 JL |
197 | memset(fattr, 0, sizeof(*fattr)); |
198 | fattr->cf_atime = cnvrtDosUnixTm(info->LastAccessDate, | |
199 | info->LastAccessTime, offset); | |
200 | fattr->cf_ctime = cnvrtDosUnixTm(info->LastWriteDate, | |
201 | info->LastWriteTime, offset); | |
202 | fattr->cf_mtime = cnvrtDosUnixTm(info->LastWriteDate, | |
203 | info->LastWriteTime, offset); | |
204 | ||
205 | fattr->cf_cifsattrs = le16_to_cpu(info->Attributes); | |
206 | fattr->cf_bytes = le32_to_cpu(info->AllocationSize); | |
207 | fattr->cf_eof = le32_to_cpu(info->DataSize); | |
208 | ||
209 | cifs_fill_common_info(fattr, cifs_sb); | |
1da177e4 LT |
210 | } |
211 | ||
0e0d2cf3 SF |
212 | /* BB eventually need to add the following helper function to |
213 | resolve NT_STATUS_STOPPED_ON_SYMLINK return code when | |
214 | we try to do FindFirst on (NTFS) directory symlinks */ | |
215 | /* | |
216 | int get_symlink_reparse_path(char *full_path, struct cifs_sb_info *cifs_sb, | |
6d5786a3 | 217 | unsigned int xid) |
0e0d2cf3 SF |
218 | { |
219 | __u16 fid; | |
220 | int len; | |
221 | int oplock = 0; | |
222 | int rc; | |
96daf2b0 | 223 | struct cifs_tcon *ptcon = cifs_sb_tcon(cifs_sb); |
0e0d2cf3 SF |
224 | char *tmpbuffer; |
225 | ||
226 | rc = CIFSSMBOpen(xid, ptcon, full_path, FILE_OPEN, GENERIC_READ, | |
227 | OPEN_REPARSE_POINT, &fid, &oplock, NULL, | |
228 | cifs_sb->local_nls, | |
229 | cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR); | |
230 | if (!rc) { | |
231 | tmpbuffer = kmalloc(maxpath); | |
232 | rc = CIFSSMBQueryReparseLinkInfo(xid, ptcon, full_path, | |
233 | tmpbuffer, | |
234 | maxpath -1, | |
235 | fid, | |
236 | cifs_sb->local_nls); | |
237 | if (CIFSSMBClose(xid, ptcon, fid)) { | |
b6b38f70 | 238 | cFYI(1, "Error closing temporary reparsepoint open"); |
0e0d2cf3 SF |
239 | } |
240 | } | |
241 | } | |
242 | */ | |
243 | ||
92fc65a7 PS |
244 | static int |
245 | initiate_cifs_search(const unsigned int xid, struct file *file) | |
1da177e4 | 246 | { |
2608bee7 | 247 | __u16 search_flags; |
1da177e4 | 248 | int rc = 0; |
7ffec372 | 249 | char *full_path = NULL; |
3870253e | 250 | struct cifsFileInfo *cifsFile; |
7ffec372 | 251 | struct cifs_sb_info *cifs_sb = CIFS_SB(file->f_path.dentry->d_sb); |
59c55ba1 | 252 | struct tcon_link *tlink = NULL; |
29e20f9c | 253 | struct cifs_tcon *tcon; |
92fc65a7 | 254 | struct TCP_Server_Info *server; |
1da177e4 | 255 | |
7ffec372 | 256 | if (file->private_data == NULL) { |
59c55ba1 JL |
257 | tlink = cifs_sb_tlink(cifs_sb); |
258 | if (IS_ERR(tlink)) | |
259 | return PTR_ERR(tlink); | |
260 | ||
261 | cifsFile = kzalloc(sizeof(struct cifsFileInfo), GFP_KERNEL); | |
262 | if (cifsFile == NULL) { | |
263 | rc = -ENOMEM; | |
264 | goto error_exit; | |
265 | } | |
266 | file->private_data = cifsFile; | |
267 | cifsFile->tlink = cifs_get_tlink(tlink); | |
29e20f9c | 268 | tcon = tlink_tcon(tlink); |
59c55ba1 JL |
269 | } else { |
270 | cifsFile = file->private_data; | |
29e20f9c | 271 | tcon = tlink_tcon(cifsFile->tlink); |
7ffec372 | 272 | } |
1da177e4 | 273 | |
92fc65a7 PS |
274 | server = tcon->ses->server; |
275 | ||
276 | if (!server->ops->query_dir_first) { | |
277 | rc = -ENOSYS; | |
278 | goto error_exit; | |
279 | } | |
280 | ||
4b18f2a9 SF |
281 | cifsFile->invalidHandle = true; |
282 | cifsFile->srch_inf.endOfSearch = false; | |
1da177e4 | 283 | |
e6a00296 | 284 | full_path = build_path_from_dentry(file->f_path.dentry); |
7ffec372 JL |
285 | if (full_path == NULL) { |
286 | rc = -ENOMEM; | |
287 | goto error_exit; | |
288 | } | |
1da177e4 | 289 | |
b6b38f70 | 290 | cFYI(1, "Full path: %s start at: %lld", full_path, file->f_pos); |
1da177e4 | 291 | |
75cf6bdc | 292 | ffirst_retry: |
1da177e4 | 293 | /* test for Unix extensions */ |
c18c842b | 294 | /* but now check for them on the share/mount not on the SMB session */ |
29e20f9c PS |
295 | /* if (cap_unix(tcon->ses) { */ |
296 | if (tcon->unix_ext) | |
5bafd765 | 297 | cifsFile->srch_inf.info_level = SMB_FIND_FILE_UNIX; |
29e20f9c PS |
298 | else if ((tcon->ses->capabilities & |
299 | tcon->ses->server->vals->cap_nt_find) == 0) { | |
5bafd765 | 300 | cifsFile->srch_inf.info_level = SMB_FIND_FILE_INFO_STANDARD; |
1da177e4 LT |
301 | } else if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM) { |
302 | cifsFile->srch_inf.info_level = SMB_FIND_FILE_ID_FULL_DIR_INFO; | |
303 | } else /* not srvinos - BB fixme add check for backlevel? */ { | |
304 | cifsFile->srch_inf.info_level = SMB_FIND_FILE_DIRECTORY_INFO; | |
305 | } | |
306 | ||
2608bee7 SP |
307 | search_flags = CIFS_SEARCH_CLOSE_AT_END | CIFS_SEARCH_RETURN_RESUME; |
308 | if (backup_cred(cifs_sb)) | |
309 | search_flags |= CIFS_SEARCH_BACKUP_SEARCH; | |
310 | ||
92fc65a7 PS |
311 | rc = server->ops->query_dir_first(xid, tcon, full_path, cifs_sb, |
312 | &cifsFile->fid, search_flags, | |
313 | &cifsFile->srch_inf); | |
314 | ||
4523cc30 | 315 | if (rc == 0) |
4b18f2a9 | 316 | cifsFile->invalidHandle = false; |
e836f015 | 317 | /* BB add following call to handle readdir on new NTFS symlink errors |
0e0d2cf3 SF |
318 | else if STATUS_STOPPED_ON_SYMLINK |
319 | call get_symlink_reparse_path and retry with new path */ | |
320 | else if ((rc == -EOPNOTSUPP) && | |
75cf6bdc SF |
321 | (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM)) { |
322 | cifs_sb->mnt_cifs_flags &= ~CIFS_MOUNT_SERVER_INUM; | |
323 | goto ffirst_retry; | |
324 | } | |
7ffec372 | 325 | error_exit: |
1da177e4 | 326 | kfree(full_path); |
7ffec372 | 327 | cifs_put_tlink(tlink); |
1da177e4 LT |
328 | return rc; |
329 | } | |
330 | ||
331 | /* return length of unicode string in bytes */ | |
cda0ec6a | 332 | static int cifs_unicode_bytelen(const char *str) |
1da177e4 LT |
333 | { |
334 | int len; | |
cda0ec6a | 335 | const __le16 *ustr = (const __le16 *)str; |
1da177e4 | 336 | |
3870253e | 337 | for (len = 0; len <= PATH_MAX; len++) { |
4523cc30 | 338 | if (ustr[len] == 0) |
1da177e4 LT |
339 | return len << 1; |
340 | } | |
b6b38f70 | 341 | cFYI(1, "Unicode string longer than PATH_MAX found"); |
1da177e4 LT |
342 | return len << 1; |
343 | } | |
344 | ||
5bafd765 | 345 | static char *nxt_dir_entry(char *old_entry, char *end_of_smb, int level) |
1da177e4 | 346 | { |
3870253e | 347 | char *new_entry; |
ad7a2926 | 348 | FILE_DIRECTORY_INFO *pDirInfo = (FILE_DIRECTORY_INFO *)old_entry; |
1da177e4 | 349 | |
4523cc30 | 350 | if (level == SMB_FIND_FILE_INFO_STANDARD) { |
ad7a2926 | 351 | FIND_FILE_STANDARD_INFO *pfData; |
5bafd765 SF |
352 | pfData = (FIND_FILE_STANDARD_INFO *)pDirInfo; |
353 | ||
354 | new_entry = old_entry + sizeof(FIND_FILE_STANDARD_INFO) + | |
355 | pfData->FileNameLength; | |
356 | } else | |
357 | new_entry = old_entry + le32_to_cpu(pDirInfo->NextEntryOffset); | |
b6b38f70 | 358 | cFYI(1, "new entry %p old entry %p", new_entry, old_entry); |
1da177e4 | 359 | /* validate that new_entry is not past end of SMB */ |
4523cc30 | 360 | if (new_entry >= end_of_smb) { |
b6b38f70 JP |
361 | cERROR(1, "search entry %p began after end of SMB %p old entry %p", |
362 | new_entry, end_of_smb, old_entry); | |
1da177e4 | 363 | return NULL; |
4523cc30 | 364 | } else if (((level == SMB_FIND_FILE_INFO_STANDARD) && |
3870253e SF |
365 | (new_entry + sizeof(FIND_FILE_STANDARD_INFO) > end_of_smb)) |
366 | || ((level != SMB_FIND_FILE_INFO_STANDARD) && | |
5bafd765 | 367 | (new_entry + sizeof(FILE_DIRECTORY_INFO) > end_of_smb))) { |
b6b38f70 JP |
368 | cERROR(1, "search entry %p extends after end of SMB %p", |
369 | new_entry, end_of_smb); | |
09d1db5c | 370 | return NULL; |
3870253e | 371 | } else |
1da177e4 LT |
372 | return new_entry; |
373 | ||
374 | } | |
375 | ||
cda0ec6a CH |
376 | struct cifs_dirent { |
377 | const char *name; | |
378 | size_t namelen; | |
379 | u32 resume_key; | |
380 | u64 ino; | |
381 | }; | |
382 | ||
383 | static void cifs_fill_dirent_unix(struct cifs_dirent *de, | |
384 | const FILE_UNIX_INFO *info, bool is_unicode) | |
385 | { | |
386 | de->name = &info->FileName[0]; | |
387 | if (is_unicode) | |
388 | de->namelen = cifs_unicode_bytelen(de->name); | |
389 | else | |
390 | de->namelen = strnlen(de->name, PATH_MAX); | |
391 | de->resume_key = info->ResumeKey; | |
392 | de->ino = le64_to_cpu(info->basic.UniqueId); | |
393 | } | |
394 | ||
395 | static void cifs_fill_dirent_dir(struct cifs_dirent *de, | |
396 | const FILE_DIRECTORY_INFO *info) | |
397 | { | |
398 | de->name = &info->FileName[0]; | |
399 | de->namelen = le32_to_cpu(info->FileNameLength); | |
400 | de->resume_key = info->FileIndex; | |
401 | } | |
402 | ||
403 | static void cifs_fill_dirent_full(struct cifs_dirent *de, | |
404 | const FILE_FULL_DIRECTORY_INFO *info) | |
405 | { | |
406 | de->name = &info->FileName[0]; | |
407 | de->namelen = le32_to_cpu(info->FileNameLength); | |
408 | de->resume_key = info->FileIndex; | |
409 | } | |
410 | ||
411 | static void cifs_fill_dirent_search(struct cifs_dirent *de, | |
412 | const SEARCH_ID_FULL_DIR_INFO *info) | |
413 | { | |
414 | de->name = &info->FileName[0]; | |
415 | de->namelen = le32_to_cpu(info->FileNameLength); | |
416 | de->resume_key = info->FileIndex; | |
417 | de->ino = le64_to_cpu(info->UniqueId); | |
418 | } | |
419 | ||
420 | static void cifs_fill_dirent_both(struct cifs_dirent *de, | |
421 | const FILE_BOTH_DIRECTORY_INFO *info) | |
422 | { | |
423 | de->name = &info->FileName[0]; | |
424 | de->namelen = le32_to_cpu(info->FileNameLength); | |
425 | de->resume_key = info->FileIndex; | |
426 | } | |
427 | ||
428 | static void cifs_fill_dirent_std(struct cifs_dirent *de, | |
429 | const FIND_FILE_STANDARD_INFO *info) | |
430 | { | |
431 | de->name = &info->FileName[0]; | |
432 | /* one byte length, no endianess conversion */ | |
433 | de->namelen = info->FileNameLength; | |
434 | de->resume_key = info->ResumeKey; | |
435 | } | |
436 | ||
437 | static int cifs_fill_dirent(struct cifs_dirent *de, const void *info, | |
438 | u16 level, bool is_unicode) | |
439 | { | |
440 | memset(de, 0, sizeof(*de)); | |
441 | ||
442 | switch (level) { | |
443 | case SMB_FIND_FILE_UNIX: | |
444 | cifs_fill_dirent_unix(de, info, is_unicode); | |
445 | break; | |
446 | case SMB_FIND_FILE_DIRECTORY_INFO: | |
447 | cifs_fill_dirent_dir(de, info); | |
448 | break; | |
449 | case SMB_FIND_FILE_FULL_DIRECTORY_INFO: | |
450 | cifs_fill_dirent_full(de, info); | |
451 | break; | |
452 | case SMB_FIND_FILE_ID_FULL_DIR_INFO: | |
453 | cifs_fill_dirent_search(de, info); | |
454 | break; | |
455 | case SMB_FIND_FILE_BOTH_DIRECTORY_INFO: | |
456 | cifs_fill_dirent_both(de, info); | |
457 | break; | |
458 | case SMB_FIND_FILE_INFO_STANDARD: | |
459 | cifs_fill_dirent_std(de, info); | |
460 | break; | |
461 | default: | |
462 | cFYI(1, "Unknown findfirst level %d", level); | |
463 | return -EINVAL; | |
464 | } | |
465 | ||
466 | return 0; | |
467 | } | |
468 | ||
1da177e4 LT |
469 | #define UNICODE_DOT cpu_to_le16(0x2e) |
470 | ||
471 | /* return 0 if no match and 1 for . (current directory) and 2 for .. (parent) */ | |
cda0ec6a | 472 | static int cifs_entry_is_dot(struct cifs_dirent *de, bool is_unicode) |
1da177e4 LT |
473 | { |
474 | int rc = 0; | |
1da177e4 | 475 | |
cda0ec6a CH |
476 | if (!de->name) |
477 | return 0; | |
1da177e4 | 478 | |
cda0ec6a CH |
479 | if (is_unicode) { |
480 | __le16 *ufilename = (__le16 *)de->name; | |
481 | if (de->namelen == 2) { | |
482 | /* check for . */ | |
483 | if (ufilename[0] == UNICODE_DOT) | |
484 | rc = 1; | |
485 | } else if (de->namelen == 4) { | |
486 | /* check for .. */ | |
487 | if (ufilename[0] == UNICODE_DOT && | |
488 | ufilename[1] == UNICODE_DOT) | |
489 | rc = 2; | |
490 | } | |
491 | } else /* ASCII */ { | |
492 | if (de->namelen == 1) { | |
493 | if (de->name[0] == '.') | |
494 | rc = 1; | |
495 | } else if (de->namelen == 2) { | |
496 | if (de->name[0] == '.' && de->name[1] == '.') | |
497 | rc = 2; | |
1da177e4 LT |
498 | } |
499 | } | |
500 | ||
501 | return rc; | |
502 | } | |
503 | ||
eafe8701 SF |
504 | /* Check if directory that we are searching has changed so we can decide |
505 | whether we can use the cached search results from the previous search */ | |
3870253e | 506 | static int is_dir_changed(struct file *file) |
eafe8701 | 507 | { |
496ad9aa | 508 | struct inode *inode = file_inode(file); |
c33f8d32 | 509 | struct cifsInodeInfo *cifsInfo = CIFS_I(inode); |
eafe8701 | 510 | |
c33f8d32 | 511 | if (cifsInfo->time == 0) |
eafe8701 SF |
512 | return 1; /* directory was changed, perhaps due to unlink */ |
513 | else | |
514 | return 0; | |
515 | ||
516 | } | |
517 | ||
0752f152 | 518 | static int cifs_save_resume_key(const char *current_entry, |
eaf35b1e | 519 | struct cifsFileInfo *file_info) |
0752f152 | 520 | { |
eaf35b1e CH |
521 | struct cifs_dirent de; |
522 | int rc; | |
0752f152 | 523 | |
eaf35b1e CH |
524 | rc = cifs_fill_dirent(&de, current_entry, file_info->srch_inf.info_level, |
525 | file_info->srch_inf.unicode); | |
526 | if (!rc) { | |
527 | file_info->srch_inf.presume_name = de.name; | |
528 | file_info->srch_inf.resume_name_len = de.namelen; | |
529 | file_info->srch_inf.resume_key = de.resume_key; | |
0752f152 | 530 | } |
0752f152 SF |
531 | return rc; |
532 | } | |
533 | ||
92fc65a7 PS |
534 | /* |
535 | * Find the corresponding entry in the search. Note that the SMB server returns | |
536 | * search entries for . and .. which complicates logic here if we choose to | |
537 | * parse for them and we do not assume that they are located in the findfirst | |
538 | * return buffer. We start counting in the buffer with entry 2 and increment for | |
539 | * every entry (do not increment for . or .. entry). | |
540 | */ | |
541 | static int | |
542 | find_cifs_entry(const unsigned int xid, struct cifs_tcon *tcon, | |
543 | struct file *file, char **current_entry, int *num_to_ret) | |
1da177e4 | 544 | { |
2608bee7 | 545 | __u16 search_flags; |
1da177e4 LT |
546 | int rc = 0; |
547 | int pos_in_buf = 0; | |
548 | loff_t first_entry_in_buffer; | |
549 | loff_t index_to_find = file->f_pos; | |
92fc65a7 | 550 | struct cifsFileInfo *cfile = file->private_data; |
2608bee7 | 551 | struct cifs_sb_info *cifs_sb = CIFS_SB(file->f_path.dentry->d_sb); |
92fc65a7 | 552 | struct TCP_Server_Info *server = tcon->ses->server; |
1da177e4 | 553 | /* check if index in the buffer */ |
50c2f753 | 554 | |
92fc65a7 PS |
555 | if (!server->ops->query_dir_first || !server->ops->query_dir_next) |
556 | return -ENOSYS; | |
557 | ||
558 | if ((cfile == NULL) || (current_entry == NULL) || (num_to_ret == NULL)) | |
1da177e4 | 559 | return -ENOENT; |
50c2f753 | 560 | |
92fc65a7 PS |
561 | *current_entry = NULL; |
562 | first_entry_in_buffer = cfile->srch_inf.index_of_last_entry - | |
563 | cfile->srch_inf.entries_in_buffer; | |
60808233 | 564 | |
92fc65a7 PS |
565 | /* |
566 | * If first entry in buf is zero then is first buffer | |
567 | * in search response data which means it is likely . and .. | |
568 | * will be in this buffer, although some servers do not return | |
569 | * . and .. for the root of a drive and for those we need | |
570 | * to start two entries earlier. | |
571 | */ | |
60808233 | 572 | |
3979877e | 573 | dump_cifs_file_struct(file, "In fce "); |
92fc65a7 PS |
574 | if (((index_to_find < cfile->srch_inf.index_of_last_entry) && |
575 | is_dir_changed(file)) || (index_to_find < first_entry_in_buffer)) { | |
1da177e4 | 576 | /* close and restart search */ |
b6b38f70 | 577 | cFYI(1, "search backing up - close and restart search"); |
4477288a | 578 | spin_lock(&cifs_file_list_lock); |
92fc65a7 PS |
579 | if (!cfile->srch_inf.endOfSearch && !cfile->invalidHandle) { |
580 | cfile->invalidHandle = true; | |
4477288a | 581 | spin_unlock(&cifs_file_list_lock); |
92fc65a7 PS |
582 | if (server->ops->close) |
583 | server->ops->close(xid, tcon, &cfile->fid); | |
ddb4cbfc | 584 | } else |
4477288a | 585 | spin_unlock(&cifs_file_list_lock); |
92fc65a7 | 586 | if (cfile->srch_inf.ntwrk_buf_start) { |
b6b38f70 | 587 | cFYI(1, "freeing SMB ff cache buf on search rewind"); |
92fc65a7 PS |
588 | if (cfile->srch_inf.smallBuf) |
589 | cifs_small_buf_release(cfile->srch_inf. | |
d47d7c1a SF |
590 | ntwrk_buf_start); |
591 | else | |
92fc65a7 | 592 | cifs_buf_release(cfile->srch_inf. |
d47d7c1a | 593 | ntwrk_buf_start); |
92fc65a7 | 594 | cfile->srch_inf.ntwrk_buf_start = NULL; |
1da177e4 | 595 | } |
3870253e | 596 | rc = initiate_cifs_search(xid, file); |
4523cc30 | 597 | if (rc) { |
b6b38f70 JP |
598 | cFYI(1, "error %d reinitiating a search on rewind", |
599 | rc); | |
1da177e4 LT |
600 | return rc; |
601 | } | |
7023676f | 602 | /* FindFirst/Next set last_entry to NULL on malformed reply */ |
92fc65a7 PS |
603 | if (cfile->srch_inf.last_entry) |
604 | cifs_save_resume_key(cfile->srch_inf.last_entry, cfile); | |
1da177e4 LT |
605 | } |
606 | ||
2608bee7 SP |
607 | search_flags = CIFS_SEARCH_CLOSE_AT_END | CIFS_SEARCH_RETURN_RESUME; |
608 | if (backup_cred(cifs_sb)) | |
609 | search_flags |= CIFS_SEARCH_BACKUP_SEARCH; | |
610 | ||
92fc65a7 PS |
611 | while ((index_to_find >= cfile->srch_inf.index_of_last_entry) && |
612 | (rc == 0) && !cfile->srch_inf.endOfSearch) { | |
b6b38f70 | 613 | cFYI(1, "calling findnext2"); |
92fc65a7 PS |
614 | rc = server->ops->query_dir_next(xid, tcon, &cfile->fid, |
615 | search_flags, | |
616 | &cfile->srch_inf); | |
7023676f | 617 | /* FindFirst/Next set last_entry to NULL on malformed reply */ |
92fc65a7 PS |
618 | if (cfile->srch_inf.last_entry) |
619 | cifs_save_resume_key(cfile->srch_inf.last_entry, cfile); | |
4523cc30 | 620 | if (rc) |
1da177e4 LT |
621 | return -ENOENT; |
622 | } | |
92fc65a7 | 623 | if (index_to_find < cfile->srch_inf.index_of_last_entry) { |
1da177e4 LT |
624 | /* we found the buffer that contains the entry */ |
625 | /* scan and find it */ | |
626 | int i; | |
92fc65a7 PS |
627 | char *cur_ent; |
628 | char *end_of_smb = cfile->srch_inf.ntwrk_buf_start + | |
629 | server->ops->calc_smb_size( | |
630 | cfile->srch_inf.ntwrk_buf_start); | |
631 | ||
632 | cur_ent = cfile->srch_inf.srch_entries_start; | |
633 | first_entry_in_buffer = cfile->srch_inf.index_of_last_entry | |
634 | - cfile->srch_inf.entries_in_buffer; | |
1da177e4 | 635 | pos_in_buf = index_to_find - first_entry_in_buffer; |
b6b38f70 | 636 | cFYI(1, "found entry - pos_in_buf %d", pos_in_buf); |
5bafd765 | 637 | |
92fc65a7 | 638 | for (i = 0; (i < (pos_in_buf)) && (cur_ent != NULL); i++) { |
dfb7533b | 639 | /* go entry by entry figuring out which is first */ |
92fc65a7 PS |
640 | cur_ent = nxt_dir_entry(cur_ent, end_of_smb, |
641 | cfile->srch_inf.info_level); | |
1da177e4 | 642 | } |
92fc65a7 | 643 | if ((cur_ent == NULL) && (i < pos_in_buf)) { |
1da177e4 | 644 | /* BB fixme - check if we should flag this error */ |
b6b38f70 | 645 | cERROR(1, "reached end of buf searching for pos in buf" |
92fc65a7 PS |
646 | " %d index to find %lld rc %d", pos_in_buf, |
647 | index_to_find, rc); | |
1da177e4 LT |
648 | } |
649 | rc = 0; | |
92fc65a7 | 650 | *current_entry = cur_ent; |
1da177e4 | 651 | } else { |
b6b38f70 | 652 | cFYI(1, "index not in buffer - could not findnext into it"); |
1da177e4 LT |
653 | return 0; |
654 | } | |
655 | ||
92fc65a7 | 656 | if (pos_in_buf >= cfile->srch_inf.entries_in_buffer) { |
b6b38f70 | 657 | cFYI(1, "can not return entries pos_in_buf beyond last"); |
1da177e4 LT |
658 | *num_to_ret = 0; |
659 | } else | |
92fc65a7 | 660 | *num_to_ret = cfile->srch_inf.entries_in_buffer - pos_in_buf; |
1da177e4 LT |
661 | |
662 | return rc; | |
663 | } | |
664 | ||
9feed6f8 CH |
665 | static int cifs_filldir(char *find_entry, struct file *file, filldir_t filldir, |
666 | void *dirent, char *scratch_buf, unsigned int max_len) | |
1da177e4 | 667 | { |
9feed6f8 CH |
668 | struct cifsFileInfo *file_info = file->private_data; |
669 | struct super_block *sb = file->f_path.dentry->d_sb; | |
670 | struct cifs_sb_info *cifs_sb = CIFS_SB(sb); | |
cda0ec6a | 671 | struct cifs_dirent de = { NULL, }; |
cc0bad75 | 672 | struct cifs_fattr fattr; |
9feed6f8 | 673 | struct qstr name; |
1da177e4 | 674 | int rc = 0; |
9feed6f8 | 675 | ino_t ino; |
1da177e4 | 676 | |
cda0ec6a CH |
677 | rc = cifs_fill_dirent(&de, find_entry, file_info->srch_inf.info_level, |
678 | file_info->srch_inf.unicode); | |
679 | if (rc) | |
680 | return rc; | |
5bafd765 | 681 | |
f16d59b4 CH |
682 | if (de.namelen > max_len) { |
683 | cERROR(1, "bad search response length %zd past smb end", | |
684 | de.namelen); | |
5bafd765 SF |
685 | return -EINVAL; |
686 | } | |
687 | ||
60808233 | 688 | /* skip . and .. since we added them first */ |
cda0ec6a | 689 | if (cifs_entry_is_dot(&de, file_info->srch_inf.unicode)) |
60808233 SF |
690 | return 0; |
691 | ||
f16d59b4 CH |
692 | if (file_info->srch_inf.unicode) { |
693 | struct nls_table *nlt = cifs_sb->local_nls; | |
1da177e4 | 694 | |
f16d59b4 CH |
695 | name.name = scratch_buf; |
696 | name.len = | |
acbbb76a SF |
697 | cifs_from_utf16((char *)name.name, (__le16 *)de.name, |
698 | UNICODE_NAME_MAX, | |
699 | min_t(size_t, de.namelen, | |
700 | (size_t)max_len), nlt, | |
701 | cifs_sb->mnt_cifs_flags & | |
f16d59b4 CH |
702 | CIFS_MOUNT_MAP_SPECIAL_CHR); |
703 | name.len -= nls_nullsize(nlt); | |
704 | } else { | |
705 | name.name = de.name; | |
706 | name.len = de.namelen; | |
707 | } | |
1da177e4 | 708 | |
9feed6f8 CH |
709 | switch (file_info->srch_inf.info_level) { |
710 | case SMB_FIND_FILE_UNIX: | |
cc0bad75 | 711 | cifs_unix_basic_to_fattr(&fattr, |
9feed6f8 CH |
712 | &((FILE_UNIX_INFO *)find_entry)->basic, |
713 | cifs_sb); | |
714 | break; | |
715 | case SMB_FIND_FILE_INFO_STANDARD: | |
716 | cifs_std_info_to_fattr(&fattr, | |
717 | (FIND_FILE_STANDARD_INFO *)find_entry, | |
718 | cifs_sb); | |
719 | break; | |
720 | default: | |
721 | cifs_dir_info_to_fattr(&fattr, | |
722 | (FILE_DIRECTORY_INFO *)find_entry, | |
723 | cifs_sb); | |
724 | break; | |
725 | } | |
b835bebe | 726 | |
f16d59b4 CH |
727 | if (de.ino && (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM)) { |
728 | fattr.cf_uniqueid = de.ino; | |
ec06aedd | 729 | } else { |
0b8f18e3 | 730 | fattr.cf_uniqueid = iunique(sb, ROOT_I); |
ec06aedd JL |
731 | cifs_autodisable_serverino(cifs_sb); |
732 | } | |
50c2f753 | 733 | |
1b12b9c1 SM |
734 | if ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MF_SYMLINKS) && |
735 | CIFSCouldBeMFSymlink(&fattr)) | |
736 | /* | |
737 | * trying to get the type and mode can be slow, | |
738 | * so just call those regular files for now, and mark | |
739 | * for reval | |
740 | */ | |
741 | fattr.cf_flags |= CIFS_FATTR_NEED_REVAL; | |
742 | ||
eb1b3fa5 | 743 | cifs_prime_dcache(file->f_dentry, &name, &fattr); |
3870253e | 744 | |
eb1b3fa5 | 745 | ino = cifs_uniqueid_to_ino_t(fattr.cf_uniqueid); |
9feed6f8 CH |
746 | rc = filldir(dirent, name.name, name.len, file->f_pos, ino, |
747 | fattr.cf_dtype); | |
1da177e4 LT |
748 | return rc; |
749 | } | |
750 | ||
1da177e4 LT |
751 | |
752 | int cifs_readdir(struct file *file, void *direntry, filldir_t filldir) | |
753 | { | |
754 | int rc = 0; | |
6d5786a3 PS |
755 | unsigned int xid; |
756 | int i; | |
92fc65a7 | 757 | struct cifs_tcon *tcon; |
1da177e4 | 758 | struct cifsFileInfo *cifsFile = NULL; |
3870253e | 759 | char *current_entry; |
1da177e4 | 760 | int num_to_fill = 0; |
3870253e | 761 | char *tmp_buf = NULL; |
50c2f753 | 762 | char *end_of_smb; |
18295796 | 763 | unsigned int max_len; |
1da177e4 | 764 | |
6d5786a3 | 765 | xid = get_xid(); |
1da177e4 | 766 | |
6221ddd0 SJ |
767 | /* |
768 | * Ensure FindFirst doesn't fail before doing filldir() for '.' and | |
769 | * '..'. Otherwise we won't be able to notify VFS in case of failure. | |
770 | */ | |
771 | if (file->private_data == NULL) { | |
772 | rc = initiate_cifs_search(xid, file); | |
773 | cFYI(1, "initiate cifs search rc %d", rc); | |
774 | if (rc) | |
775 | goto rddir2_exit; | |
776 | } | |
777 | ||
1da177e4 LT |
778 | switch ((int) file->f_pos) { |
779 | case 0: | |
60808233 | 780 | if (filldir(direntry, ".", 1, file->f_pos, |
496ad9aa | 781 | file_inode(file)->i_ino, DT_DIR) < 0) { |
b6b38f70 | 782 | cERROR(1, "Filldir for current dir failed"); |
1da177e4 LT |
783 | rc = -ENOMEM; |
784 | break; | |
785 | } | |
60808233 | 786 | file->f_pos++; |
1da177e4 | 787 | case 1: |
60808233 | 788 | if (filldir(direntry, "..", 2, file->f_pos, |
b85fd6bd | 789 | parent_ino(file->f_path.dentry), DT_DIR) < 0) { |
b6b38f70 | 790 | cERROR(1, "Filldir for parent dir failed"); |
1da177e4 LT |
791 | rc = -ENOMEM; |
792 | break; | |
793 | } | |
60808233 SF |
794 | file->f_pos++; |
795 | default: | |
3870253e SF |
796 | /* 1) If search is active, |
797 | is in current search buffer? | |
1da177e4 LT |
798 | if it before then restart search |
799 | if after then keep searching till find it */ | |
800 | ||
790fe579 | 801 | if (file->private_data == NULL) { |
1da177e4 | 802 | rc = -EINVAL; |
6d5786a3 | 803 | free_xid(xid); |
1da177e4 LT |
804 | return rc; |
805 | } | |
806 | cifsFile = file->private_data; | |
807 | if (cifsFile->srch_inf.endOfSearch) { | |
790fe579 | 808 | if (cifsFile->srch_inf.emptyDir) { |
b6b38f70 | 809 | cFYI(1, "End of search, empty dir"); |
1da177e4 LT |
810 | rc = 0; |
811 | break; | |
812 | } | |
813 | } /* else { | |
4b18f2a9 | 814 | cifsFile->invalidHandle = true; |
92fc65a7 | 815 | tcon->ses->server->close(xid, tcon, &cifsFile->fid); |
aaa9bbe0 | 816 | } */ |
1da177e4 | 817 | |
92fc65a7 PS |
818 | tcon = tlink_tcon(cifsFile->tlink); |
819 | rc = find_cifs_entry(xid, tcon, file, ¤t_entry, | |
820 | &num_to_fill); | |
790fe579 | 821 | if (rc) { |
b6b38f70 | 822 | cFYI(1, "fce error %d", rc); |
1da177e4 LT |
823 | goto rddir2_exit; |
824 | } else if (current_entry != NULL) { | |
b6b38f70 | 825 | cFYI(1, "entry %lld found", file->f_pos); |
1da177e4 | 826 | } else { |
b6b38f70 | 827 | cFYI(1, "could not find entry"); |
1da177e4 LT |
828 | goto rddir2_exit; |
829 | } | |
b6b38f70 JP |
830 | cFYI(1, "loop through %d times filling dir for net buf %p", |
831 | num_to_fill, cifsFile->srch_inf.ntwrk_buf_start); | |
92fc65a7 | 832 | max_len = tcon->ses->server->ops->calc_smb_size( |
5bafd765 SF |
833 | cifsFile->srch_inf.ntwrk_buf_start); |
834 | end_of_smb = cifsFile->srch_inf.ntwrk_buf_start + max_len; | |
835 | ||
f5884166 | 836 | tmp_buf = kmalloc(UNICODE_NAME_MAX, GFP_KERNEL); |
f55fdcca KV |
837 | if (tmp_buf == NULL) { |
838 | rc = -ENOMEM; | |
839 | break; | |
840 | } | |
841 | ||
790fe579 SF |
842 | for (i = 0; (i < num_to_fill) && (rc == 0); i++) { |
843 | if (current_entry == NULL) { | |
1da177e4 | 844 | /* evaluate whether this case is an error */ |
b6b38f70 JP |
845 | cERROR(1, "past SMB end, num to fill %d i %d", |
846 | num_to_fill, i); | |
1da177e4 LT |
847 | break; |
848 | } | |
92fc65a7 PS |
849 | /* |
850 | * if buggy server returns . and .. late do we want to | |
851 | * check for that here? | |
852 | */ | |
853 | rc = cifs_filldir(current_entry, file, filldir, | |
854 | direntry, tmp_buf, max_len); | |
790fe579 | 855 | if (rc == -EOVERFLOW) { |
7ca85ba7 SF |
856 | rc = 0; |
857 | break; | |
858 | } | |
859 | ||
1da177e4 | 860 | file->f_pos++; |
790fe579 | 861 | if (file->f_pos == |
3979877e | 862 | cifsFile->srch_inf.index_of_last_entry) { |
b6b38f70 JP |
863 | cFYI(1, "last entry in buf at pos %lld %s", |
864 | file->f_pos, tmp_buf); | |
790fe579 | 865 | cifs_save_resume_key(current_entry, cifsFile); |
1da177e4 | 866 | break; |
790fe579 SF |
867 | } else |
868 | current_entry = | |
5bafd765 SF |
869 | nxt_dir_entry(current_entry, end_of_smb, |
870 | cifsFile->srch_inf.info_level); | |
1da177e4 LT |
871 | } |
872 | kfree(tmp_buf); | |
873 | break; | |
874 | } /* end switch */ | |
875 | ||
876 | rddir2_exit: | |
6d5786a3 | 877 | free_xid(xid); |
1da177e4 LT |
878 | return rc; |
879 | } |