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