1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
|
/*
* dir.c
*
* PURPOSE
* Directory handling routines for the OSTA-UDF(tm) filesystem.
*
* COPYRIGHT
* This file is distributed under the terms of the GNU General Public
* License (GPL). Copies of the GPL can be obtained from:
* ftp://prep.ai.mit.edu/pub/gnu/GPL
* Each contributing author retains all rights to their own work.
*
* (C) 1998-2004 Ben Fennema
*
* HISTORY
*
* 10/05/98 dgb Split directory operations into its own file
* Implemented directory reads via do_udf_readdir
* 10/06/98 Made directory operations work!
* 11/17/98 Rewrote directory to support ICBTAG_FLAG_AD_LONG
* 11/25/98 blf Rewrote directory handling (readdir+lookup) to support reading
* across blocks.
* 12/12/98 Split out the lookup code to namei.c. bulk of directory
* code now in directory.c:udf_fileident_read.
*/
#include "udfdecl.h"
#include <linux/string.h>
#include <linux/errno.h>
#include <linux/mm.h>
#include <linux/slab.h>
#include <linux/smp_lock.h>
#include <linux/buffer_head.h>
#include "udf_i.h"
#include "udf_sb.h"
/* Prototypes for file operations */
static int udf_readdir(struct file *, void *, filldir_t);
static int do_udf_readdir(struct inode *, struct file *, filldir_t, void *);
/* readdir and lookup functions */
const struct file_operations udf_dir_operations = {
.read = generic_read_dir,
.readdir = udf_readdir,
.ioctl = udf_ioctl,
.fsync = udf_fsync_file,
};
/*
* udf_readdir
*
* PURPOSE
* Read a directory entry.
*
* DESCRIPTION
* Optional - sys_getdents() will return -ENOTDIR if this routine is not
* available.
*
* Refer to sys_getdents() in fs/readdir.c
* sys_getdents() -> .
*
* PRE-CONDITIONS
* filp Pointer to directory file.
* buf Pointer to directory entry buffer.
* filldir Pointer to filldir function.
*
* POST-CONDITIONS
* <return> >=0 on success.
*
* HISTORY
* July 1, 1997 - Andrew E. Mileski
* Written, tested, and released.
*/
int udf_readdir(struct file *filp, void *dirent, filldir_t filldir)
{
struct inode *dir = filp->f_path.dentry->d_inode;
int result;
lock_kernel();
if ( filp->f_pos == 0 )
{
if (filldir(dirent, ".", 1, filp->f_pos, dir->i_ino, DT_DIR) < 0)
{
unlock_kernel();
return 0;
}
filp->f_pos ++;
}
result = do_udf_readdir(dir, filp, filldir, dirent);
unlock_kernel();
return result;
}
static int
do_udf_readdir(struct inode * dir, struct file *filp, filldir_t filldir, void *dirent)
{
struct udf_fileident_bh fibh;
struct fileIdentDesc *fi=NULL;
struct fileIdentDesc cfi;
int block, iblock;
loff_t nf_pos = filp->f_pos - 1;
int flen;
char fname[UDF_NAME_LEN];
char *nameptr;
uint16_t liu;
uint8_t lfi;
loff_t size = (udf_ext0_offset(dir) + dir->i_size) >> 2;
struct buffer_head * bh = NULL, * tmp, * bha[16];
kernel_lb_addr bloc, eloc;
uint32_t extoffset, elen, offset;
int i, num;
unsigned int dt_type;
if (nf_pos >= size)
return 0;
if (nf_pos == 0)
nf_pos = (udf_ext0_offset(dir) >> 2);
fibh.soffset = fibh.eoffset = (nf_pos & ((dir->i_sb->s_blocksize - 1) >> 2)) << 2;
if (UDF_I_ALLOCTYPE(dir) == ICBTAG_FLAG_AD_IN_ICB)
fibh.sbh = fibh.ebh = NULL;
else if (inode_bmap(dir, nf_pos >> (dir->i_sb->s_blocksize_bits - 2),
&bloc, &extoffset, &eloc, &elen, &offset, &bh) == (EXT_RECORDED_ALLOCATED >> 30))
{
offset >>= dir->i_sb->s_blocksize_bits;
block = udf_get_lb_pblock(dir->i_sb, eloc, offset);
if ((++offset << dir->i_sb->s_blocksize_bits) < elen)
{
if (UDF_I_ALLOCTYPE(dir) == ICBTAG_FLAG_AD_SHORT)
extoffset -= sizeof(short_ad);
else if (UDF_I_ALLOCTYPE(dir) == ICBTAG_FLAG_AD_LONG)
extoffset -= sizeof(long_ad);
}
else
offset = 0;
if (!(fibh.sbh = fibh.ebh = udf_tread(dir->i_sb, block)))
{
udf_release_data(bh);
return -EIO;
}
if (!(offset & ((16 >> (dir->i_sb->s_blocksize_bits - 9))-1)))
{
i = 16 >> (dir->i_sb->s_blocksize_bits - 9);
if (i+offset > (elen >> dir->i_sb->s_blocksize_bits))
i = (elen >> dir->i_sb->s_blocksize_bits)-offset;
for (num=0; i>0; i--)
{
block = udf_get_lb_pblock(dir->i_sb, eloc, offset+i);
tmp = udf_tgetblk(dir->i_sb, block);
if (tmp && !buffer_uptodate(tmp) && !buffer_locked(tmp))
bha[num++] = tmp;
else
brelse(tmp);
}
if (num)
{
ll_rw_block(READA, num, bha);
for (i=0; i<num; i++)
brelse(bha[i]);
}
}
}
else
{
udf_release_data(bh);
return -ENOENT;
}
while ( nf_pos < size )
{
filp->f_pos = nf_pos + 1;
fi = udf_fileident_read(dir, &nf_pos, &fibh, &cfi, &bloc, &extoffset, &eloc, &elen, &offset, &bh);
if (!fi)
{
if (fibh.sbh != fibh.ebh)
udf_release_data(fibh.ebh);
udf_release_data(fibh.sbh);
udf_release_data(bh);
return 0;
}
liu = le16_to_cpu(cfi.lengthOfImpUse);
lfi = cfi.lengthFileIdent;
if (fibh.sbh == fibh.ebh)
nameptr = fi->fileIdent + liu;
else
{
int poffset; /* Unpaded ending offset */
poffset = fibh.soffset + sizeof(struct fileIdentDesc) + liu + lfi;
if (poffset >= lfi)
nameptr = (char *)(fibh.ebh->b_data + poffset - lfi);
else
{
nameptr = fname;
memcpy(nameptr, fi->fileIdent + liu, lfi - poffset);
memcpy(nameptr + lfi - poffset, fibh.ebh->b_data, poffset);
}
}
if ( (cfi.fileCharacteristics & FID_FILE_CHAR_DELETED) != 0 )
{
if ( !UDF_QUERY_FLAG(dir->i_sb, UDF_FLAG_UNDELETE) )
continue;
}
if ( (cfi.fileCharacteristics & FID_FILE_CHAR_HIDDEN) != 0 )
{
if ( !UDF_QUERY_FLAG(dir->i_sb, UDF_FLAG_UNHIDE) )
continue;
}
if ( cfi.fileCharacteristics & FID_FILE_CHAR_PARENT )
{
iblock = parent_ino(filp->f_path.dentry);
flen = 2;
memcpy(fname, "..", flen);
dt_type = DT_DIR;
}
else
{
kernel_lb_addr tloc = lelb_to_cpu(cfi.icb.extLocation);
iblock = udf_get_lb_pblock(dir->i_sb, tloc, 0);
flen = udf_get_filename(dir->i_sb, nameptr, fname, lfi);
dt_type = DT_UNKNOWN;
}
if (flen)
{
if (filldir(dirent, fname, flen, filp->f_pos, iblock, dt_type) < 0)
{
if (fibh.sbh != fibh.ebh)
udf_release_data(fibh.ebh);
udf_release_data(fibh.sbh);
udf_release_data(bh);
return 0;
}
}
} /* end while */
filp->f_pos = nf_pos + 1;
if (fibh.sbh != fibh.ebh)
udf_release_data(fibh.ebh);
udf_release_data(fibh.sbh);
udf_release_data(bh);
return 0;
}
|
