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authorLinus Torvalds <torvalds@ppc970.osdl.org>2005-04-16 18:20:36 -0400
committerLinus Torvalds <torvalds@ppc970.osdl.org>2005-04-16 18:20:36 -0400
commit1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 (patch)
tree0bba044c4ce775e45a88a51686b5d9f90697ea9d /fs/cifs/readdir.c
Linux-2.6.12-rc2v2.6.12-rc2
Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
Diffstat (limited to 'fs/cifs/readdir.c')
-rw-r--r--fs/cifs/readdir.c867
1 files changed, 867 insertions, 0 deletions
diff --git a/fs/cifs/readdir.c b/fs/cifs/readdir.c
new file mode 100644
index 000000000000..f8bea395ec9e
--- /dev/null
+++ b/fs/cifs/readdir.c
@@ -0,0 +1,867 @@
1/*
2 * fs/cifs/readdir.c
3 *
4 * Directory search handling
5 *
6 * Copyright (C) International Business Machines Corp., 2004
7 * Author(s): Steve French (sfrench@us.ibm.com)
8 *
9 * This library is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU Lesser General Public License as published
11 * by the Free Software Foundation; either version 2.1 of the License, or
12 * (at your option) any later version.
13 *
14 * This library is distributed in the hope that it will be useful,
15 * but WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See
17 * the GNU Lesser General Public License for more details.
18 *
19 * You should have received a copy of the GNU Lesser General Public License
20 * along with this library; if not, write to the Free Software
21 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
22 */
23#include <linux/fs.h>
24#include <linux/stat.h>
25#include <linux/smp_lock.h>
26#include "cifspdu.h"
27#include "cifsglob.h"
28#include "cifsproto.h"
29#include "cifs_unicode.h"
30#include "cifs_debug.h"
31#include "cifs_fs_sb.h"
32#include "cifsfs.h"
33
34/* BB fixme - add debug wrappers around this function to disable it fixme BB */
35/* static void dump_cifs_file_struct(struct file *file, char *label)
36{
37 struct cifsFileInfo * cf;
38
39 if(file) {
40 cf = file->private_data;
41 if(cf == NULL) {
42 cFYI(1,("empty cifs private file data"));
43 return;
44 }
45 if(cf->invalidHandle) {
46 cFYI(1,("invalid handle"));
47 }
48 if(cf->srch_inf.endOfSearch) {
49 cFYI(1,("end of search"));
50 }
51 if(cf->srch_inf.emptyDir) {
52 cFYI(1,("empty dir"));
53 }
54
55 }
56} */
57
58/* Returns one if new inode created (which therefore needs to be hashed) */
59/* Might check in the future if inode number changed so we can rehash inode */
60static int construct_dentry(struct qstr *qstring, struct file *file,
61 struct inode **ptmp_inode, struct dentry **pnew_dentry)
62{
63 struct dentry *tmp_dentry;
64 struct cifs_sb_info *cifs_sb;
65 struct cifsTconInfo *pTcon;
66 int rc = 0;
67
68 cFYI(1, ("For %s ", qstring->name));
69 cifs_sb = CIFS_SB(file->f_dentry->d_sb);
70 pTcon = cifs_sb->tcon;
71
72 qstring->hash = full_name_hash(qstring->name, qstring->len);
73 tmp_dentry = d_lookup(file->f_dentry, qstring);
74 if (tmp_dentry) {
75 cFYI(0, (" existing dentry with inode 0x%p", tmp_dentry->d_inode));
76 *ptmp_inode = tmp_dentry->d_inode;
77/* BB overwrite old name? i.e. tmp_dentry->d_name and tmp_dentry->d_name.len??*/
78 if(*ptmp_inode == NULL) {
79 *ptmp_inode = new_inode(file->f_dentry->d_sb);
80 if(*ptmp_inode == NULL)
81 return rc;
82 rc = 1;
83 d_instantiate(tmp_dentry, *ptmp_inode);
84 }
85 } else {
86 tmp_dentry = d_alloc(file->f_dentry, qstring);
87 if(tmp_dentry == NULL) {
88 cERROR(1,("Failed allocating dentry"));
89 *ptmp_inode = NULL;
90 return rc;
91 }
92
93 *ptmp_inode = new_inode(file->f_dentry->d_sb);
94 tmp_dentry->d_op = &cifs_dentry_ops;
95 if(*ptmp_inode == NULL)
96 return rc;
97 rc = 1;
98 d_instantiate(tmp_dentry, *ptmp_inode);
99 d_rehash(tmp_dentry);
100 }
101
102 tmp_dentry->d_time = jiffies;
103 *pnew_dentry = tmp_dentry;
104 return rc;
105}
106
107static void fill_in_inode(struct inode *tmp_inode,
108 FILE_DIRECTORY_INFO *pfindData, int *pobject_type)
109{
110 struct cifsInodeInfo *cifsInfo = CIFS_I(tmp_inode);
111 struct cifs_sb_info *cifs_sb = CIFS_SB(tmp_inode->i_sb);
112 __u32 attr = le32_to_cpu(pfindData->ExtFileAttributes);
113 __u64 allocation_size = le64_to_cpu(pfindData->AllocationSize);
114 __u64 end_of_file = le64_to_cpu(pfindData->EndOfFile);
115
116 cifsInfo->cifsAttrs = attr;
117 cifsInfo->time = jiffies;
118
119 /* Linux can not store file creation time unfortunately so ignore it */
120 tmp_inode->i_atime =
121 cifs_NTtimeToUnix(le64_to_cpu(pfindData->LastAccessTime));
122 tmp_inode->i_mtime =
123 cifs_NTtimeToUnix(le64_to_cpu(pfindData->LastWriteTime));
124 tmp_inode->i_ctime =
125 cifs_NTtimeToUnix(le64_to_cpu(pfindData->ChangeTime));
126 /* treat dos attribute of read-only as read-only mode bit e.g. 555? */
127 /* 2767 perms - indicate mandatory locking */
128 /* BB fill in uid and gid here? with help from winbind?
129 or retrieve from NTFS stream extended attribute */
130 if (atomic_read(&cifsInfo->inUse) == 0) {
131 tmp_inode->i_uid = cifs_sb->mnt_uid;
132 tmp_inode->i_gid = cifs_sb->mnt_gid;
133 /* set default mode. will override for dirs below */
134 tmp_inode->i_mode = cifs_sb->mnt_file_mode;
135 }
136
137 cFYI(0,("CIFS FFIRST: Attributes came in as 0x%x",attr));
138 if (attr & ATTR_DIRECTORY) {
139 *pobject_type = DT_DIR;
140 /* override default perms since we do not lock dirs */
141 if(atomic_read(&cifsInfo->inUse) == 0) {
142 tmp_inode->i_mode = cifs_sb->mnt_dir_mode;
143 }
144 tmp_inode->i_mode |= S_IFDIR;
145/* we no longer mark these because we could not follow them */
146/* } else if (attr & ATTR_REPARSE) {
147 *pobject_type = DT_LNK;
148 tmp_inode->i_mode |= S_IFLNK; */
149 } else {
150 *pobject_type = DT_REG;
151 tmp_inode->i_mode |= S_IFREG;
152 if (attr & ATTR_READONLY)
153 tmp_inode->i_mode &= ~(S_IWUGO);
154 } /* could add code here - to validate if device or weird share type? */
155
156 /* can not fill in nlink here as in qpathinfo version and Unx search */
157 if (atomic_read(&cifsInfo->inUse) == 0) {
158 atomic_set(&cifsInfo->inUse, 1);
159 }
160
161 if (is_size_safe_to_change(cifsInfo)) {
162 /* can not safely change the file size here if the
163 client is writing to it due to potential races */
164 i_size_write(tmp_inode, end_of_file);
165
166 /* 512 bytes (2**9) is the fake blocksize that must be used */
167 /* for this calculation, even though the reported blocksize is larger */
168 tmp_inode->i_blocks = (512 - 1 + allocation_size) >> 9;
169 }
170
171 if (allocation_size < end_of_file)
172 cFYI(1, ("May be sparse file, allocation less than file size"));
173 cFYI(1,
174 ("File Size %ld and blocks %ld and blocksize %ld",
175 (unsigned long)tmp_inode->i_size, tmp_inode->i_blocks,
176 tmp_inode->i_blksize));
177 if (S_ISREG(tmp_inode->i_mode)) {
178 cFYI(1, (" File inode "));
179 tmp_inode->i_op = &cifs_file_inode_ops;
180 if(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DIRECT_IO)
181 tmp_inode->i_fop = &cifs_file_direct_ops;
182 else
183 tmp_inode->i_fop = &cifs_file_ops;
184 tmp_inode->i_data.a_ops = &cifs_addr_ops;
185 } else if (S_ISDIR(tmp_inode->i_mode)) {
186 cFYI(1, (" Directory inode"));
187 tmp_inode->i_op = &cifs_dir_inode_ops;
188 tmp_inode->i_fop = &cifs_dir_ops;
189 } else if (S_ISLNK(tmp_inode->i_mode)) {
190 cFYI(1, (" Symbolic Link inode "));
191 tmp_inode->i_op = &cifs_symlink_inode_ops;
192 } else {
193 cFYI(1, (" Init special inode "));
194 init_special_inode(tmp_inode, tmp_inode->i_mode,
195 tmp_inode->i_rdev);
196 }
197}
198
199static void unix_fill_in_inode(struct inode *tmp_inode,
200 FILE_UNIX_INFO *pfindData, int *pobject_type)
201{
202 struct cifsInodeInfo *cifsInfo = CIFS_I(tmp_inode);
203 struct cifs_sb_info *cifs_sb = CIFS_SB(tmp_inode->i_sb);
204
205 __u32 type = le32_to_cpu(pfindData->Type);
206 __u64 num_of_bytes = le64_to_cpu(pfindData->NumOfBytes);
207 __u64 end_of_file = le64_to_cpu(pfindData->EndOfFile);
208 cifsInfo->time = jiffies;
209 atomic_inc(&cifsInfo->inUse);
210
211 tmp_inode->i_atime =
212 cifs_NTtimeToUnix(le64_to_cpu(pfindData->LastAccessTime));
213 tmp_inode->i_mtime =
214 cifs_NTtimeToUnix(le64_to_cpu(pfindData->LastModificationTime));
215 tmp_inode->i_ctime =
216 cifs_NTtimeToUnix(le64_to_cpu(pfindData->LastStatusChange));
217
218 tmp_inode->i_mode = le64_to_cpu(pfindData->Permissions);
219 if (type == UNIX_FILE) {
220 *pobject_type = DT_REG;
221 tmp_inode->i_mode |= S_IFREG;
222 } else if (type == UNIX_SYMLINK) {
223 *pobject_type = DT_LNK;
224 tmp_inode->i_mode |= S_IFLNK;
225 } else if (type == UNIX_DIR) {
226 *pobject_type = DT_DIR;
227 tmp_inode->i_mode |= S_IFDIR;
228 } else if (type == UNIX_CHARDEV) {
229 *pobject_type = DT_CHR;
230 tmp_inode->i_mode |= S_IFCHR;
231 tmp_inode->i_rdev = MKDEV(le64_to_cpu(pfindData->DevMajor),
232 le64_to_cpu(pfindData->DevMinor) & MINORMASK);
233 } else if (type == UNIX_BLOCKDEV) {
234 *pobject_type = DT_BLK;
235 tmp_inode->i_mode |= S_IFBLK;
236 tmp_inode->i_rdev = MKDEV(le64_to_cpu(pfindData->DevMajor),
237 le64_to_cpu(pfindData->DevMinor) & MINORMASK);
238 } else if (type == UNIX_FIFO) {
239 *pobject_type = DT_FIFO;
240 tmp_inode->i_mode |= S_IFIFO;
241 } else if (type == UNIX_SOCKET) {
242 *pobject_type = DT_SOCK;
243 tmp_inode->i_mode |= S_IFSOCK;
244 }
245
246 tmp_inode->i_uid = le64_to_cpu(pfindData->Uid);
247 tmp_inode->i_gid = le64_to_cpu(pfindData->Gid);
248 tmp_inode->i_nlink = le64_to_cpu(pfindData->Nlinks);
249
250 if (is_size_safe_to_change(cifsInfo)) {
251 /* can not safely change the file size here if the
252 client is writing to it due to potential races */
253 i_size_write(tmp_inode,end_of_file);
254
255 /* 512 bytes (2**9) is the fake blocksize that must be used */
256 /* for this calculation, not the real blocksize */
257 tmp_inode->i_blocks = (512 - 1 + num_of_bytes) >> 9;
258 }
259
260 if (S_ISREG(tmp_inode->i_mode)) {
261 cFYI(1, ("File inode"));
262 tmp_inode->i_op = &cifs_file_inode_ops;
263 if(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DIRECT_IO)
264 tmp_inode->i_fop = &cifs_file_direct_ops;
265 else
266 tmp_inode->i_fop = &cifs_file_ops;
267 tmp_inode->i_data.a_ops = &cifs_addr_ops;
268 } else if (S_ISDIR(tmp_inode->i_mode)) {
269 cFYI(1, ("Directory inode"));
270 tmp_inode->i_op = &cifs_dir_inode_ops;
271 tmp_inode->i_fop = &cifs_dir_ops;
272 } else if (S_ISLNK(tmp_inode->i_mode)) {
273 cFYI(1, ("Symbolic Link inode"));
274 tmp_inode->i_op = &cifs_symlink_inode_ops;
275/* tmp_inode->i_fop = *//* do not need to set to anything */
276 } else {
277 cFYI(1, ("Special inode"));
278 init_special_inode(tmp_inode, tmp_inode->i_mode,
279 tmp_inode->i_rdev);
280 }
281}
282
283static int initiate_cifs_search(const int xid, struct file *file)
284{
285 int rc = 0;
286 char * full_path;
287 struct cifsFileInfo * cifsFile;
288 struct cifs_sb_info *cifs_sb;
289 struct cifsTconInfo *pTcon;
290
291 if(file->private_data == NULL) {
292 file->private_data =
293 kmalloc(sizeof(struct cifsFileInfo),GFP_KERNEL);
294 }
295
296 if(file->private_data == NULL) {
297 return -ENOMEM;
298 } else {
299 memset(file->private_data,0,sizeof(struct cifsFileInfo));
300 }
301 cifsFile = file->private_data;
302 cifsFile->invalidHandle = TRUE;
303 cifsFile->srch_inf.endOfSearch = FALSE;
304
305 if(file->f_dentry == NULL)
306 return -ENOENT;
307
308 cifs_sb = CIFS_SB(file->f_dentry->d_sb);
309 if(cifs_sb == NULL)
310 return -EINVAL;
311
312 pTcon = cifs_sb->tcon;
313 if(pTcon == NULL)
314 return -EINVAL;
315
316 down(&file->f_dentry->d_sb->s_vfs_rename_sem);
317 full_path = build_wildcard_path_from_dentry(file->f_dentry);
318 up(&file->f_dentry->d_sb->s_vfs_rename_sem);
319
320 if(full_path == NULL) {
321 return -ENOMEM;
322 }
323
324 cFYI(1, ("Full path: %s start at: %lld ", full_path, file->f_pos));
325
326 /* test for Unix extensions */
327 if (pTcon->ses->capabilities & CAP_UNIX) {
328 cifsFile->srch_inf.info_level = SMB_FIND_FILE_UNIX;
329 } else if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM) {
330 cifsFile->srch_inf.info_level = SMB_FIND_FILE_ID_FULL_DIR_INFO;
331 } else /* not srvinos - BB fixme add check for backlevel? */ {
332 cifsFile->srch_inf.info_level = SMB_FIND_FILE_DIRECTORY_INFO;
333 }
334
335 rc = CIFSFindFirst(xid, pTcon,full_path,cifs_sb->local_nls,
336 &cifsFile->netfid, &cifsFile->srch_inf);
337 if(rc == 0)
338 cifsFile->invalidHandle = FALSE;
339 kfree(full_path);
340 return rc;
341}
342
343/* return length of unicode string in bytes */
344static int cifs_unicode_bytelen(char *str)
345{
346 int len;
347 __le16 * ustr = (__le16 *)str;
348
349 for(len=0;len <= PATH_MAX;len++) {
350 if(ustr[len] == 0)
351 return len << 1;
352 }
353 cFYI(1,("Unicode string longer than PATH_MAX found"));
354 return len << 1;
355}
356
357static char *nxt_dir_entry(char *old_entry, char *end_of_smb)
358{
359 char * new_entry;
360 FILE_DIRECTORY_INFO * pDirInfo = (FILE_DIRECTORY_INFO *)old_entry;
361
362 new_entry = old_entry + le32_to_cpu(pDirInfo->NextEntryOffset);
363 cFYI(1,("new entry %p old entry %p",new_entry,old_entry));
364 /* validate that new_entry is not past end of SMB */
365 if(new_entry >= end_of_smb) {
366 cFYI(1,("search entry %p began after end of SMB %p old entry %p",
367 new_entry,end_of_smb,old_entry));
368 return NULL;
369 } else
370 return new_entry;
371
372}
373
374#define UNICODE_DOT cpu_to_le16(0x2e)
375
376/* return 0 if no match and 1 for . (current directory) and 2 for .. (parent) */
377static int cifs_entry_is_dot(char *current_entry, struct cifsFileInfo *cfile)
378{
379 int rc = 0;
380 char * filename = NULL;
381 int len = 0;
382
383 if(cfile->srch_inf.info_level == 0x202) {
384 FILE_UNIX_INFO * pFindData = (FILE_UNIX_INFO *)current_entry;
385 filename = &pFindData->FileName[0];
386 if(cfile->srch_inf.unicode) {
387 len = cifs_unicode_bytelen(filename);
388 } else {
389 /* BB should we make this strnlen of PATH_MAX? */
390 len = strnlen(filename, 5);
391 }
392 } else if(cfile->srch_inf.info_level == 0x101) {
393 FILE_DIRECTORY_INFO * pFindData =
394 (FILE_DIRECTORY_INFO *)current_entry;
395 filename = &pFindData->FileName[0];
396 len = le32_to_cpu(pFindData->FileNameLength);
397 } else if(cfile->srch_inf.info_level == 0x102) {
398 FILE_FULL_DIRECTORY_INFO * pFindData =
399 (FILE_FULL_DIRECTORY_INFO *)current_entry;
400 filename = &pFindData->FileName[0];
401 len = le32_to_cpu(pFindData->FileNameLength);
402 } else if(cfile->srch_inf.info_level == 0x105) {
403 SEARCH_ID_FULL_DIR_INFO * pFindData =
404 (SEARCH_ID_FULL_DIR_INFO *)current_entry;
405 filename = &pFindData->FileName[0];
406 len = le32_to_cpu(pFindData->FileNameLength);
407 } else if(cfile->srch_inf.info_level == 0x104) {
408 FILE_BOTH_DIRECTORY_INFO * pFindData =
409 (FILE_BOTH_DIRECTORY_INFO *)current_entry;
410 filename = &pFindData->FileName[0];
411 len = le32_to_cpu(pFindData->FileNameLength);
412 } else {
413 cFYI(1,("Unknown findfirst level %d",cfile->srch_inf.info_level));
414 }
415
416 if(filename) {
417 if(cfile->srch_inf.unicode) {
418 __le16 *ufilename = (__le16 *)filename;
419 if(len == 2) {
420 /* check for . */
421 if(ufilename[0] == UNICODE_DOT)
422 rc = 1;
423 } else if(len == 4) {
424 /* check for .. */
425 if((ufilename[0] == UNICODE_DOT)
426 &&(ufilename[1] == UNICODE_DOT))
427 rc = 2;
428 }
429 } else /* ASCII */ {
430 if(len == 1) {
431 if(filename[0] == '.')
432 rc = 1;
433 } else if(len == 2) {
434 if((filename[0] == '.') && (filename[1] == '.'))
435 rc = 2;
436 }
437 }
438 }
439
440 return rc;
441}
442
443/* find the corresponding entry in the search */
444/* Note that the SMB server returns search entries for . and .. which
445 complicates logic here if we choose to parse for them and we do not
446 assume that they are located in the findfirst return buffer.*/
447/* We start counting in the buffer with entry 2 and increment for every
448 entry (do not increment for . or .. entry) */
449static int find_cifs_entry(const int xid, struct cifsTconInfo *pTcon,
450 struct file *file, char **ppCurrentEntry, int *num_to_ret)
451{
452 int rc = 0;
453 int pos_in_buf = 0;
454 loff_t first_entry_in_buffer;
455 loff_t index_to_find = file->f_pos;
456 struct cifsFileInfo * cifsFile = file->private_data;
457 /* check if index in the buffer */
458
459 if((cifsFile == NULL) || (ppCurrentEntry == NULL) || (num_to_ret == NULL))
460 return -ENOENT;
461
462 *ppCurrentEntry = NULL;
463 first_entry_in_buffer =
464 cifsFile->srch_inf.index_of_last_entry -
465 cifsFile->srch_inf.entries_in_buffer;
466/* dump_cifs_file_struct(file, "In fce ");*/
467 if(index_to_find < first_entry_in_buffer) {
468 /* close and restart search */
469 cFYI(1,("search backing up - close and restart search"));
470 cifsFile->invalidHandle = TRUE;
471 CIFSFindClose(xid, pTcon, cifsFile->netfid);
472 kfree(cifsFile->search_resume_name);
473 cifsFile->search_resume_name = NULL;
474 if(cifsFile->srch_inf.ntwrk_buf_start) {
475 cFYI(1,("freeing SMB ff cache buf on search rewind"));
476 cifs_buf_release(cifsFile->srch_inf.ntwrk_buf_start);
477 }
478 rc = initiate_cifs_search(xid,file);
479 if(rc) {
480 cFYI(1,("error %d reinitiating a search on rewind",rc));
481 return rc;
482 }
483 }
484
485 while((index_to_find >= cifsFile->srch_inf.index_of_last_entry) &&
486 (rc == 0) && (cifsFile->srch_inf.endOfSearch == FALSE)){
487 cFYI(1,("calling findnext2"));
488 rc = CIFSFindNext(xid,pTcon,cifsFile->netfid, &cifsFile->srch_inf);
489 if(rc)
490 return -ENOENT;
491 }
492 if(index_to_find < cifsFile->srch_inf.index_of_last_entry) {
493 /* we found the buffer that contains the entry */
494 /* scan and find it */
495 int i;
496 char * current_entry;
497 char * end_of_smb = cifsFile->srch_inf.ntwrk_buf_start +
498 smbCalcSize((struct smb_hdr *)
499 cifsFile->srch_inf.ntwrk_buf_start);
500/* dump_cifs_file_struct(file,"found entry in fce "); */
501 first_entry_in_buffer = cifsFile->srch_inf.index_of_last_entry
502 - cifsFile->srch_inf.entries_in_buffer;
503 pos_in_buf = index_to_find - first_entry_in_buffer;
504 cFYI(1,("found entry - pos_in_buf %d",pos_in_buf));
505 current_entry = cifsFile->srch_inf.srch_entries_start;
506 for(i=0;(i<(pos_in_buf)) && (current_entry != NULL);i++) {
507 /* go entry to next entry figuring out which we need to start with */
508 /* if( . or ..)
509 skip */
510 rc = cifs_entry_is_dot(current_entry,cifsFile);
511 if(rc == 1) /* is . or .. so skip */ {
512 cFYI(1,("Entry is .")); /* BB removeme BB */
513 /* continue; */
514 } else if (rc == 2 ) {
515 cFYI(1,("Entry is ..")); /* BB removeme BB */
516 /* continue; */
517 }
518 current_entry = nxt_dir_entry(current_entry,end_of_smb);
519 }
520 if((current_entry == NULL) && (i < pos_in_buf)) {
521 /* BB fixme - check if we should flag this error */
522 cERROR(1,("reached end of buf searching for pos in buf"
523 " %d index to find %lld rc %d",
524 pos_in_buf,index_to_find,rc));
525 }
526 rc = 0;
527 *ppCurrentEntry = current_entry;
528 } else {
529 cFYI(1,("index not in buffer - could not findnext into it"));
530 return 0;
531 }
532
533 if(pos_in_buf >= cifsFile->srch_inf.entries_in_buffer) {
534 cFYI(1,("can not return entries when pos_in_buf beyond last entry"));
535 *num_to_ret = 0;
536 } else
537 *num_to_ret = cifsFile->srch_inf.entries_in_buffer - pos_in_buf;
538/* dump_cifs_file_struct(file, "end fce ");*/
539
540 return rc;
541}
542
543/* inode num, inode type and filename returned */
544static int cifs_get_name_from_search_buf(struct qstr *pqst,
545 char *current_entry, __u16 level, unsigned int unicode,
546 struct cifs_sb_info * cifs_sb, ino_t *pinum)
547{
548 int rc = 0;
549 unsigned int len = 0;
550 char * filename;
551 struct nls_table * nlt = cifs_sb->local_nls;
552
553 *pinum = 0;
554
555 if(level == SMB_FIND_FILE_UNIX) {
556 FILE_UNIX_INFO * pFindData = (FILE_UNIX_INFO *)current_entry;
557
558 filename = &pFindData->FileName[0];
559 if(unicode) {
560 len = cifs_unicode_bytelen(filename);
561 } else {
562 /* BB should we make this strnlen of PATH_MAX? */
563 len = strnlen(filename, PATH_MAX);
564 }
565
566 /* BB fixme - hash low and high 32 bits if not 64 bit arch BB fixme */
567 if(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM)
568 *pinum = pFindData->UniqueId;
569 } else if(level == SMB_FIND_FILE_DIRECTORY_INFO) {
570 FILE_DIRECTORY_INFO * pFindData =
571 (FILE_DIRECTORY_INFO *)current_entry;
572 filename = &pFindData->FileName[0];
573 len = le32_to_cpu(pFindData->FileNameLength);
574 } else if(level == SMB_FIND_FILE_FULL_DIRECTORY_INFO) {
575 FILE_FULL_DIRECTORY_INFO * pFindData =
576 (FILE_FULL_DIRECTORY_INFO *)current_entry;
577 filename = &pFindData->FileName[0];
578 len = le32_to_cpu(pFindData->FileNameLength);
579 } else if(level == SMB_FIND_FILE_ID_FULL_DIR_INFO) {
580 SEARCH_ID_FULL_DIR_INFO * pFindData =
581 (SEARCH_ID_FULL_DIR_INFO *)current_entry;
582 filename = &pFindData->FileName[0];
583 len = le32_to_cpu(pFindData->FileNameLength);
584 *pinum = pFindData->UniqueId;
585 } else if(level == SMB_FIND_FILE_BOTH_DIRECTORY_INFO) {
586 FILE_BOTH_DIRECTORY_INFO * pFindData =
587 (FILE_BOTH_DIRECTORY_INFO *)current_entry;
588 filename = &pFindData->FileName[0];
589 len = le32_to_cpu(pFindData->FileNameLength);
590 } else {
591 cFYI(1,("Unknown findfirst level %d",level));
592 return -EINVAL;
593 }
594 if(unicode) {
595 /* BB fixme - test with long names */
596 /* Note converted filename can be longer than in unicode */
597 pqst->len = cifs_strfromUCS_le((char *)pqst->name,(wchar_t *)filename,len/2,nlt);
598 } else {
599 pqst->name = filename;
600 pqst->len = len;
601 }
602 pqst->hash = full_name_hash(pqst->name,pqst->len);
603/* cFYI(1,("filldir on %s",pqst->name)); */
604 return rc;
605}
606
607static int cifs_filldir(char *pfindEntry, struct file *file,
608 filldir_t filldir, void *direntry, char *scratch_buf)
609{
610 int rc = 0;
611 struct qstr qstring;
612 struct cifsFileInfo * pCifsF;
613 unsigned obj_type;
614 ino_t inum;
615 struct cifs_sb_info * cifs_sb;
616 struct inode *tmp_inode;
617 struct dentry *tmp_dentry;
618
619 /* get filename and len into qstring */
620 /* get dentry */
621 /* decide whether to create and populate ionde */
622 if((direntry == NULL) || (file == NULL))
623 return -EINVAL;
624
625 pCifsF = file->private_data;
626
627 if((scratch_buf == NULL) || (pfindEntry == NULL) || (pCifsF == NULL))
628 return -ENOENT;
629
630 if(file->f_dentry == NULL)
631 return -ENOENT;
632
633 cifs_sb = CIFS_SB(file->f_dentry->d_sb);
634
635 qstring.name = scratch_buf;
636 rc = cifs_get_name_from_search_buf(&qstring,pfindEntry,
637 pCifsF->srch_inf.info_level,
638 pCifsF->srch_inf.unicode,cifs_sb,
639 &inum /* returned */);
640
641 if(rc)
642 return rc;
643
644 rc = construct_dentry(&qstring,file,&tmp_inode, &tmp_dentry);
645 if((tmp_inode == NULL) || (tmp_dentry == NULL))
646 return -ENOMEM;
647
648 if(rc) {
649 /* inode created, we need to hash it with right inode number */
650 if(inum != 0) {
651 /* BB fixme - hash the 2 32 quantities bits together if necessary BB */
652 tmp_inode->i_ino = inum;
653 }
654 insert_inode_hash(tmp_inode);
655 }
656
657 if(pCifsF->srch_inf.info_level == SMB_FIND_FILE_UNIX) {
658 unix_fill_in_inode(tmp_inode,(FILE_UNIX_INFO *)pfindEntry,&obj_type);
659 } else {
660 fill_in_inode(tmp_inode,(FILE_DIRECTORY_INFO *)pfindEntry,&obj_type);
661 }
662
663 rc = filldir(direntry,qstring.name,qstring.len,file->f_pos,tmp_inode->i_ino,obj_type);
664 if(rc) {
665 cFYI(1,("filldir rc = %d",rc));
666 }
667
668 dput(tmp_dentry);
669 return rc;
670}
671
672static int cifs_save_resume_key(const char *current_entry,
673 struct cifsFileInfo *cifsFile)
674{
675 int rc = 0;
676 unsigned int len = 0;
677 __u16 level;
678 char * filename;
679
680 if((cifsFile == NULL) || (current_entry == NULL))
681 return -EINVAL;
682
683 level = cifsFile->srch_inf.info_level;
684
685 if(level == SMB_FIND_FILE_UNIX) {
686 FILE_UNIX_INFO * pFindData = (FILE_UNIX_INFO *)current_entry;
687
688 filename = &pFindData->FileName[0];
689 if(cifsFile->srch_inf.unicode) {
690 len = cifs_unicode_bytelen(filename);
691 } else {
692 /* BB should we make this strnlen of PATH_MAX? */
693 len = strnlen(filename, PATH_MAX);
694 }
695 cifsFile->srch_inf.resume_key = pFindData->ResumeKey;
696 } else if(level == SMB_FIND_FILE_DIRECTORY_INFO) {
697 FILE_DIRECTORY_INFO * pFindData =
698 (FILE_DIRECTORY_INFO *)current_entry;
699 filename = &pFindData->FileName[0];
700 len = le32_to_cpu(pFindData->FileNameLength);
701 cifsFile->srch_inf.resume_key = pFindData->FileIndex;
702 } else if(level == SMB_FIND_FILE_FULL_DIRECTORY_INFO) {
703 FILE_FULL_DIRECTORY_INFO * pFindData =
704 (FILE_FULL_DIRECTORY_INFO *)current_entry;
705 filename = &pFindData->FileName[0];
706 len = le32_to_cpu(pFindData->FileNameLength);
707 cifsFile->srch_inf.resume_key = pFindData->FileIndex;
708 } else if(level == SMB_FIND_FILE_ID_FULL_DIR_INFO) {
709 SEARCH_ID_FULL_DIR_INFO * pFindData =
710 (SEARCH_ID_FULL_DIR_INFO *)current_entry;
711 filename = &pFindData->FileName[0];
712 len = le32_to_cpu(pFindData->FileNameLength);
713 cifsFile->srch_inf.resume_key = pFindData->FileIndex;
714 } else if(level == SMB_FIND_FILE_BOTH_DIRECTORY_INFO) {
715 FILE_BOTH_DIRECTORY_INFO * pFindData =
716 (FILE_BOTH_DIRECTORY_INFO *)current_entry;
717 filename = &pFindData->FileName[0];
718 len = le32_to_cpu(pFindData->FileNameLength);
719 cifsFile->srch_inf.resume_key = pFindData->FileIndex;
720 } else {
721 cFYI(1,("Unknown findfirst level %d",level));
722 return -EINVAL;
723 }
724 cifsFile->srch_inf.resume_name_len = len;
725 cifsFile->srch_inf.presume_name = filename;
726 return rc;
727}
728
729int cifs_readdir(struct file *file, void *direntry, filldir_t filldir)
730{
731 int rc = 0;
732 int xid,i;
733 struct cifs_sb_info *cifs_sb;
734 struct cifsTconInfo *pTcon;
735 struct cifsFileInfo *cifsFile = NULL;
736 char * current_entry;
737 int num_to_fill = 0;
738 char * tmp_buf = NULL;
739 char * end_of_smb;
740
741 xid = GetXid();
742
743 if(file->f_dentry == NULL) {
744 FreeXid(xid);
745 return -EIO;
746 }
747/* dump_cifs_file_struct(file, "Begin rdir "); */
748
749 cifs_sb = CIFS_SB(file->f_dentry->d_sb);
750 pTcon = cifs_sb->tcon;
751 if(pTcon == NULL)
752 return -EINVAL;
753
754/* cFYI(1,("readdir2 pos: %lld",file->f_pos)); */
755
756 switch ((int) file->f_pos) {
757 case 0:
758 /*if (filldir(direntry, ".", 1, file->f_pos,
759 file->f_dentry->d_inode->i_ino, DT_DIR) < 0) {
760 cERROR(1, ("Filldir for current dir failed "));
761 rc = -ENOMEM;
762 break;
763 }
764 file->f_pos++; */
765 case 1:
766 /* if (filldir(direntry, "..", 2, file->f_pos,
767 file->f_dentry->d_parent->d_inode->i_ino, DT_DIR) < 0) {
768 cERROR(1, ("Filldir for parent dir failed "));
769 rc = -ENOMEM;
770 break;
771 }
772 file->f_pos++; */
773 case 2:
774 /* 1) If search is active,
775 is in current search buffer?
776 if it before then restart search
777 if after then keep searching till find it */
778
779 if(file->private_data == NULL) {
780 rc = initiate_cifs_search(xid,file);
781 cFYI(1,("initiate cifs search rc %d",rc));
782 if(rc) {
783 FreeXid(xid);
784 return rc;
785 }
786 }
787 default:
788 if(file->private_data == NULL) {
789 rc = -EINVAL;
790 FreeXid(xid);
791 return rc;
792 }
793 cifsFile = file->private_data;
794 if (cifsFile->srch_inf.endOfSearch) {
795 if(cifsFile->srch_inf.emptyDir) {
796 cFYI(1, ("End of search, empty dir"));
797 rc = 0;
798 break;
799 }
800 } /* else {
801 cifsFile->invalidHandle = TRUE;
802 CIFSFindClose(xid, pTcon, cifsFile->netfid);
803 }
804 kfree(cifsFile->search_resume_name);
805 cifsFile->search_resume_name = NULL; */
806
807 /* BB account for . and .. in f_pos as special case */
808 /* dump_cifs_file_struct(file, "rdir after default ");*/
809
810 rc = find_cifs_entry(xid,pTcon, file,
811 &current_entry,&num_to_fill);
812 if(rc) {
813 cFYI(1,("fce error %d",rc));
814 goto rddir2_exit;
815 } else if (current_entry != NULL) {
816 cFYI(1,("entry %lld found",file->f_pos));
817 } else {
818 cFYI(1,("could not find entry"));
819 goto rddir2_exit;
820 }
821 cFYI(1,("loop through %d times filling dir for net buf %p",
822 num_to_fill,cifsFile->srch_inf.ntwrk_buf_start));
823 end_of_smb = cifsFile->srch_inf.ntwrk_buf_start +
824 smbCalcSize((struct smb_hdr *)
825 cifsFile->srch_inf.ntwrk_buf_start);
826 tmp_buf = kmalloc(NAME_MAX+1,GFP_KERNEL);
827 for(i=0;(i<num_to_fill) && (rc == 0);i++) {
828 if(current_entry == NULL) {
829 /* evaluate whether this case is an error */
830 cERROR(1,("past end of SMB num to fill %d i %d",
831 num_to_fill, i));
832 break;
833 }
834
835 /* BB FIXME - need to enable the below code BB */
836
837 /* if((!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM)) ||
838 (cifsFile->srch_inf.info_level !=
839 something that supports server inodes)) {
840 create dentry
841 create inode
842 fill in inode new_inode (getting local i_ino)
843 }
844 also create local inode for performance reasons (so we
845 have a cache of inode metadata) unless this new mount
846 parm says otherwise */
847
848 rc = cifs_filldir(current_entry, file,
849 filldir, direntry,tmp_buf);
850 file->f_pos++;
851 if(file->f_pos == cifsFile->srch_inf.index_of_last_entry) {
852 cFYI(1,("last entry in buf at pos %lld %s",
853 file->f_pos,tmp_buf)); /* BB removeme BB */
854 cifs_save_resume_key(current_entry,cifsFile);
855 break;
856 } else
857 current_entry = nxt_dir_entry(current_entry,end_of_smb);
858 }
859 kfree(tmp_buf);
860 break;
861 } /* end switch */
862
863rddir2_exit:
864 /* dump_cifs_file_struct(file, "end rdir "); */
865 FreeXid(xid);
866 return rc;
867}
generated by cgit v1.2.2 (git 2.25.0) at 2024-11-07 14:33:49 -0500