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27#include "udfdecl.h"
28
29#include <linux/string.h>
30#include <linux/errno.h>
31#include <linux/mm.h>
32#include <linux/slab.h>
33#include <linux/smp_lock.h>
34#include <linux/buffer_head.h>
35
36#include "udf_i.h"
37#include "udf_sb.h"
38
39static int do_udf_readdir(struct inode *dir, struct file *filp,
40 filldir_t filldir, void *dirent)
41{
42 struct udf_fileident_bh fibh = { .sbh = NULL, .ebh = NULL};
43 struct fileIdentDesc *fi = NULL;
44 struct fileIdentDesc cfi;
45 int block, iblock;
46 loff_t nf_pos = (filp->f_pos - 1) << 2;
47 int flen;
48 char *fname = NULL;
49 char *nameptr;
50 uint16_t liu;
51 uint8_t lfi;
52 loff_t size = udf_ext0_offset(dir) + dir->i_size;
53 struct buffer_head *tmp, *bha[16];
54 kernel_lb_addr eloc;
55 uint32_t elen;
56 sector_t offset;
57 int i, num, ret = 0;
58 unsigned int dt_type;
59 struct extent_position epos = { NULL, 0, {0, 0} };
60 struct udf_inode_info *iinfo;
61
62 if (nf_pos >= size)
63 goto out;
64
65 fname = kmalloc(UDF_NAME_LEN, GFP_NOFS);
66 if (!fname) {
67 ret = -ENOMEM;
68 goto out;
69 }
70
71 if (nf_pos == 0)
72 nf_pos = udf_ext0_offset(dir);
73
74 fibh.soffset = fibh.eoffset = nf_pos & (dir->i_sb->s_blocksize - 1);
75 iinfo = UDF_I(dir);
76 if (iinfo->i_alloc_type != ICBTAG_FLAG_AD_IN_ICB) {
77 if (inode_bmap(dir, nf_pos >> dir->i_sb->s_blocksize_bits,
78 &epos, &eloc, &elen, &offset)
79 != (EXT_RECORDED_ALLOCATED >> 30)) {
80 ret = -ENOENT;
81 goto out;
82 }
83 block = udf_get_lb_pblock(dir->i_sb, eloc, offset);
84 if ((++offset << dir->i_sb->s_blocksize_bits) < elen) {
85 if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT)
86 epos.offset -= sizeof(short_ad);
87 else if (iinfo->i_alloc_type ==
88 ICBTAG_FLAG_AD_LONG)
89 epos.offset -= sizeof(long_ad);
90 } else {
91 offset = 0;
92 }
93
94 if (!(fibh.sbh = fibh.ebh = udf_tread(dir->i_sb, block))) {
95 ret = -EIO;
96 goto out;
97 }
98
99 if (!(offset & ((16 >> (dir->i_sb->s_blocksize_bits - 9)) - 1))) {
100 i = 16 >> (dir->i_sb->s_blocksize_bits - 9);
101 if (i + offset > (elen >> dir->i_sb->s_blocksize_bits))
102 i = (elen >> dir->i_sb->s_blocksize_bits) - offset;
103 for (num = 0; i > 0; i--) {
104 block = udf_get_lb_pblock(dir->i_sb, eloc, offset + i);
105 tmp = udf_tgetblk(dir->i_sb, block);
106 if (tmp && !buffer_uptodate(tmp) && !buffer_locked(tmp))
107 bha[num++] = tmp;
108 else
109 brelse(tmp);
110 }
111 if (num) {
112 ll_rw_block(READA, num, bha);
113 for (i = 0; i < num; i++)
114 brelse(bha[i]);
115 }
116 }
117 }
118
119 while (nf_pos < size) {
120 filp->f_pos = (nf_pos >> 2) + 1;
121
122 fi = udf_fileident_read(dir, &nf_pos, &fibh, &cfi, &epos, &eloc,
123 &elen, &offset);
124 if (!fi)
125 goto out;
126
127 liu = le16_to_cpu(cfi.lengthOfImpUse);
128 lfi = cfi.lengthFileIdent;
129
130 if (fibh.sbh == fibh.ebh) {
131 nameptr = fi->fileIdent + liu;
132 } else {
133 int poffset;
134
135 poffset = fibh.soffset + sizeof(struct fileIdentDesc) + liu + lfi;
136
137 if (poffset >= lfi) {
138 nameptr = (char *)(fibh.ebh->b_data + poffset - lfi);
139 } else {
140 nameptr = fname;
141 memcpy(nameptr, fi->fileIdent + liu,
142 lfi - poffset);
143 memcpy(nameptr + lfi - poffset,
144 fibh.ebh->b_data, poffset);
145 }
146 }
147
148 if ((cfi.fileCharacteristics & FID_FILE_CHAR_DELETED) != 0) {
149 if (!UDF_QUERY_FLAG(dir->i_sb, UDF_FLAG_UNDELETE))
150 continue;
151 }
152
153 if ((cfi.fileCharacteristics & FID_FILE_CHAR_HIDDEN) != 0) {
154 if (!UDF_QUERY_FLAG(dir->i_sb, UDF_FLAG_UNHIDE))
155 continue;
156 }
157
158 if (cfi.fileCharacteristics & FID_FILE_CHAR_PARENT) {
159 iblock = parent_ino(filp->f_path.dentry);
160 flen = 2;
161 memcpy(fname, "..", flen);
162 dt_type = DT_DIR;
163 } else {
164 kernel_lb_addr tloc = lelb_to_cpu(cfi.icb.extLocation);
165
166 iblock = udf_get_lb_pblock(dir->i_sb, tloc, 0);
167 flen = udf_get_filename(dir->i_sb, nameptr, fname, lfi);
168 dt_type = DT_UNKNOWN;
169 }
170
171 if (flen && filldir(dirent, fname, flen, filp->f_pos,
172 iblock, dt_type) < 0)
173 goto out;
174 }
175
176 filp->f_pos = (nf_pos >> 2) + 1;
177
178out:
179 if (fibh.sbh != fibh.ebh)
180 brelse(fibh.ebh);
181 brelse(fibh.sbh);
182 brelse(epos.bh);
183 kfree(fname);
184
185 return ret;
186}
187
188static int udf_readdir(struct file *filp, void *dirent, filldir_t filldir)
189{
190 struct inode *dir = filp->f_path.dentry->d_inode;
191 int result;
192
193 lock_kernel();
194
195 if (filp->f_pos == 0) {
196 if (filldir(dirent, ".", 1, filp->f_pos, dir->i_ino, DT_DIR) < 0) {
197 unlock_kernel();
198 return 0;
199 }
200 filp->f_pos++;
201 }
202
203 result = do_udf_readdir(dir, filp, filldir, dirent);
204 unlock_kernel();
205 return result;
206}
207
208
209const struct file_operations udf_dir_operations = {
210 .read = generic_read_dir,
211 .readdir = udf_readdir,
212 .ioctl = udf_ioctl,
213 .fsync = udf_fsync_file,
214};
215
