5 * Directory handling routines for the OSTA-UDF(tm) filesystem.
8 * This file is distributed under the terms of the GNU General Public
9 * License (GPL). Copies of the GPL can be obtained from:
10 * ftp://prep.ai.mit.edu/pub/gnu/GPL
11 * Each contributing author retains all rights to their own work.
13 * (C) 1998-2004 Ben Fennema
17 * 10/05/98 dgb Split directory operations into its own file
18 * Implemented directory reads via do_udf_readdir
19 * 10/06/98 Made directory operations work!
20 * 11/17/98 Rewrote directory to support ICBTAG_FLAG_AD_LONG
21 * 11/25/98 blf Rewrote directory handling (readdir+lookup) to support reading
23 * 12/12/98 Split out the lookup code to namei.c. bulk of directory
24 * code now in directory.c:udf_fileident_read.
29 #include <linux/string.h>
30 #include <linux/errno.h>
32 #include <linux/slab.h>
33 #include <linux/bio.h>
39 static int udf_readdir(struct file *file, struct dir_context *ctx)
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;
49 unsigned char *fname = NULL, *copy_name = NULL;
50 unsigned char *nameptr;
53 loff_t size = udf_ext0_offset(dir) + dir->i_size;
54 struct buffer_head *tmp, *bha[16];
55 struct kernel_lb_addr eloc;
59 struct extent_position epos = { NULL, 0, {0, 0} };
60 struct super_block *sb = dir->i_sb;
63 if (!dir_emit_dot(file, ctx))
67 nf_pos = (ctx->pos - 1) << 2;
71 fname = kmalloc(UDF_NAME_LEN, GFP_NOFS);
78 nf_pos = udf_ext0_offset(dir);
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)) {
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 ==
94 epos.offset -= sizeof(struct long_ad);
99 if (!(fibh.sbh = fibh.ebh = udf_tread(sb, block))) {
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))
117 ll_rw_block(REQ_OP_READ, REQ_RAHEAD, num, bha);
118 for (i = 0; i < num; i++)
124 while (nf_pos < size) {
125 struct kernel_lb_addr tloc;
127 ctx->pos = (nf_pos >> 2) + 1;
129 fi = udf_fileident_read(dir, &nf_pos, &fibh, &cfi, &epos, &eloc,
134 liu = le16_to_cpu(cfi.lengthOfImpUse);
135 lfi = cfi.lengthFileIdent;
137 if (fibh.sbh == fibh.ebh) {
138 nameptr = fi->fileIdent + liu;
140 int poffset; /* Unpaded ending offset */
142 poffset = fibh.soffset + sizeof(struct fileIdentDesc) + liu + lfi;
144 if (poffset >= lfi) {
145 nameptr = (char *)(fibh.ebh->b_data + poffset - lfi);
148 copy_name = kmalloc(UDF_NAME_LEN,
156 memcpy(nameptr, fi->fileIdent + liu,
158 memcpy(nameptr + lfi - poffset,
159 fibh.ebh->b_data, poffset);
163 if ((cfi.fileCharacteristics & FID_FILE_CHAR_DELETED) != 0) {
164 if (!UDF_QUERY_FLAG(sb, UDF_FLAG_UNDELETE))
168 if ((cfi.fileCharacteristics & FID_FILE_CHAR_HIDDEN) != 0) {
169 if (!UDF_QUERY_FLAG(sb, UDF_FLAG_UNHIDE))
173 if (cfi.fileCharacteristics & FID_FILE_CHAR_PARENT) {
174 if (!dir_emit_dotdot(file, ctx))
179 flen = udf_get_filename(sb, nameptr, lfi, fname, UDF_NAME_LEN);
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))
189 ctx->pos = (nf_pos >> 2) + 1;
192 if (fibh.sbh != fibh.ebh)
202 /* readdir and lookup functions */
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,