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