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Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
2 * dir.c
3 *
4 * PURPOSE
5 * Directory handling routines for the OSTA-UDF(tm) filesystem.
6 *
Linus Torvalds1da177e2005-04-16 15:20:36 -07007 * COPYRIGHT
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.
12 *
13 * (C) 1998-2004 Ben Fennema
14 *
15 * HISTORY
16 *
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
22 * across blocks.
23 * 12/12/98 Split out the lookup code to namei.c. bulk of directory
24 * code now in directory.c:udf_fileident_read.
25 */
26
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>
Linus Torvalds1da177e2005-04-16 15:20:36 -070033
34#include "udf_i.h"
35#include "udf_sb.h"
36
Al Viro5add2ee2013-05-16 01:09:37 -040037
38static int udf_readdir(struct file *file, struct dir_context *ctx)
Linus Torvalds1da177e2005-04-16 15:20:36 -070039{
Al Viro5add2ee2013-05-16 01:09:37 -040040 struct inode *dir = file_inode(file);
41 struct udf_inode_info *iinfo = UDF_I(dir);
Jan Karab80697c2008-03-04 14:14:05 +010042 struct udf_fileident_bh fibh = { .sbh = NULL, .ebh = NULL};
Cyrill Gorcunovcb00ea32007-07-19 01:47:43 -070043 struct fileIdentDesc *fi = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -070044 struct fileIdentDesc cfi;
45 int block, iblock;
Al Viro5add2ee2013-05-16 01:09:37 -040046 loff_t nf_pos;
Linus Torvalds1da177e2005-04-16 15:20:36 -070047 int flen;
Al Viro391e8bb2010-01-31 21:28:48 -050048 unsigned char *fname = NULL;
49 unsigned char *nameptr;
Linus Torvalds1da177e2005-04-16 15:20:36 -070050 uint16_t liu;
51 uint8_t lfi;
Jan Karae28d80f2008-02-13 15:03:33 -080052 loff_t size = udf_ext0_offset(dir) + dir->i_size;
Jan Karaff116fc2007-05-08 00:35:14 -070053 struct buffer_head *tmp, *bha[16];
Pekka Enberg5ca4e4b2008-10-15 12:28:03 +020054 struct kernel_lb_addr eloc;
Jan Karaff116fc2007-05-08 00:35:14 -070055 uint32_t elen;
Jan Kara60448b12007-05-08 00:35:13 -070056 sector_t offset;
Jan Karab80697c2008-03-04 14:14:05 +010057 int i, num, ret = 0;
Cyrill Gorcunovcb00ea32007-07-19 01:47:43 -070058 struct extent_position epos = { NULL, 0, {0, 0} };
Jan Kara3ee30392014-12-18 22:49:12 +010059 struct super_block *sb = dir->i_sb;
Linus Torvalds1da177e2005-04-16 15:20:36 -070060
Al Viro5add2ee2013-05-16 01:09:37 -040061 if (ctx->pos == 0) {
62 if (!dir_emit_dot(file, ctx))
63 return 0;
64 ctx->pos = 1;
65 }
66 nf_pos = (ctx->pos - 1) << 2;
Linus Torvalds1da177e2005-04-16 15:20:36 -070067 if (nf_pos >= size)
Jan Karab80697c2008-03-04 14:14:05 +010068 goto out;
69
70 fname = kmalloc(UDF_NAME_LEN, GFP_NOFS);
71 if (!fname) {
72 ret = -ENOMEM;
73 goto out;
74 }
Linus Torvalds1da177e2005-04-16 15:20:36 -070075
76 if (nf_pos == 0)
Jan Karae28d80f2008-02-13 15:03:33 -080077 nf_pos = udf_ext0_offset(dir);
Linus Torvalds1da177e2005-04-16 15:20:36 -070078
Jan Kara3ee30392014-12-18 22:49:12 +010079 fibh.soffset = fibh.eoffset = nf_pos & (sb->s_blocksize - 1);
Jan Karab80697c2008-03-04 14:14:05 +010080 if (iinfo->i_alloc_type != ICBTAG_FLAG_AD_IN_ICB) {
Jan Kara3ee30392014-12-18 22:49:12 +010081 if (inode_bmap(dir, nf_pos >> sb->s_blocksize_bits,
Jan Karab80697c2008-03-04 14:14:05 +010082 &epos, &eloc, &elen, &offset)
83 != (EXT_RECORDED_ALLOCATED >> 30)) {
84 ret = -ENOENT;
85 goto out;
86 }
Jan Kara3ee30392014-12-18 22:49:12 +010087 block = udf_get_lb_pblock(sb, &eloc, offset);
88 if ((++offset << sb->s_blocksize_bits) < elen) {
Marcin Slusarz48d6d8f2008-02-08 04:20:44 -080089 if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT)
Pekka Enberg5ca4e4b2008-10-15 12:28:03 +020090 epos.offset -= sizeof(struct short_ad);
Marcin Slusarz48d6d8f2008-02-08 04:20:44 -080091 else if (iinfo->i_alloc_type ==
Marcin Slusarzc0b34432008-02-08 04:20:42 -080092 ICBTAG_FLAG_AD_LONG)
Pekka Enberg5ca4e4b2008-10-15 12:28:03 +020093 epos.offset -= sizeof(struct long_ad);
Cyrill Gorcunov28de7942007-07-21 04:37:18 -070094 } else {
Linus Torvalds1da177e2005-04-16 15:20:36 -070095 offset = 0;
Cyrill Gorcunov28de7942007-07-21 04:37:18 -070096 }
Linus Torvalds1da177e2005-04-16 15:20:36 -070097
Jan Kara3ee30392014-12-18 22:49:12 +010098 if (!(fibh.sbh = fibh.ebh = udf_tread(sb, block))) {
Jan Karab80697c2008-03-04 14:14:05 +010099 ret = -EIO;
100 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700101 }
Cyrill Gorcunovcb00ea32007-07-19 01:47:43 -0700102
Jan Kara3ee30392014-12-18 22:49:12 +0100103 if (!(offset & ((16 >> (sb->s_blocksize_bits - 9)) - 1))) {
104 i = 16 >> (sb->s_blocksize_bits - 9);
105 if (i + offset > (elen >> sb->s_blocksize_bits))
106 i = (elen >> sb->s_blocksize_bits) - offset;
Cyrill Gorcunovcb00ea32007-07-19 01:47:43 -0700107 for (num = 0; i > 0; i--) {
Jan Kara3ee30392014-12-18 22:49:12 +0100108 block = udf_get_lb_pblock(sb, &eloc, offset + i);
109 tmp = udf_tgetblk(sb, block);
Cyrill Gorcunov28de7942007-07-21 04:37:18 -0700110 if (tmp && !buffer_uptodate(tmp) && !buffer_locked(tmp))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700111 bha[num++] = tmp;
112 else
113 brelse(tmp);
114 }
Cyrill Gorcunovcb00ea32007-07-19 01:47:43 -0700115 if (num) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700116 ll_rw_block(READA, num, bha);
Cyrill Gorcunovcb00ea32007-07-19 01:47:43 -0700117 for (i = 0; i < num; i++)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700118 brelse(bha[i]);
119 }
120 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700121 }
122
Cyrill Gorcunovcb00ea32007-07-19 01:47:43 -0700123 while (nf_pos < size) {
Al Viro5add2ee2013-05-16 01:09:37 -0400124 struct kernel_lb_addr tloc;
125
126 ctx->pos = (nf_pos >> 2) + 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700127
Cyrill Gorcunovcb00ea32007-07-19 01:47:43 -0700128 fi = udf_fileident_read(dir, &nf_pos, &fibh, &cfi, &epos, &eloc,
129 &elen, &offset);
Jan Karab80697c2008-03-04 14:14:05 +0100130 if (!fi)
131 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700132
133 liu = le16_to_cpu(cfi.lengthOfImpUse);
134 lfi = cfi.lengthFileIdent;
135
Cyrill Gorcunov28de7942007-07-21 04:37:18 -0700136 if (fibh.sbh == fibh.ebh) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700137 nameptr = fi->fileIdent + liu;
Cyrill Gorcunov28de7942007-07-21 04:37:18 -0700138 } else {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700139 int poffset; /* Unpaded ending offset */
140
Cyrill Gorcunov28de7942007-07-21 04:37:18 -0700141 poffset = fibh.soffset + sizeof(struct fileIdentDesc) + liu + lfi;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700142
Cyrill Gorcunov28de7942007-07-21 04:37:18 -0700143 if (poffset >= lfi) {
144 nameptr = (char *)(fibh.ebh->b_data + poffset - lfi);
145 } else {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700146 nameptr = fname;
Cyrill Gorcunovcb00ea32007-07-19 01:47:43 -0700147 memcpy(nameptr, fi->fileIdent + liu,
148 lfi - poffset);
149 memcpy(nameptr + lfi - poffset,
150 fibh.ebh->b_data, poffset);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700151 }
152 }
153
Cyrill Gorcunovcb00ea32007-07-19 01:47:43 -0700154 if ((cfi.fileCharacteristics & FID_FILE_CHAR_DELETED) != 0) {
Jan Kara3ee30392014-12-18 22:49:12 +0100155 if (!UDF_QUERY_FLAG(sb, UDF_FLAG_UNDELETE))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700156 continue;
157 }
158
Cyrill Gorcunovcb00ea32007-07-19 01:47:43 -0700159 if ((cfi.fileCharacteristics & FID_FILE_CHAR_HIDDEN) != 0) {
Jan Kara3ee30392014-12-18 22:49:12 +0100160 if (!UDF_QUERY_FLAG(sb, UDF_FLAG_UNHIDE))
Cyrill Gorcunovcb00ea32007-07-19 01:47:43 -0700161 continue;
162 }
163
164 if (cfi.fileCharacteristics & FID_FILE_CHAR_PARENT) {
Al Viro5add2ee2013-05-16 01:09:37 -0400165 if (!dir_emit_dotdot(file, ctx))
166 goto out;
167 continue;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700168 }
169
Jan Kara3ee30392014-12-18 22:49:12 +0100170 flen = udf_get_filename(sb, nameptr, lfi, fname, UDF_NAME_LEN);
Fabian Frederick6ce63832015-04-08 21:23:57 +0200171 if (flen < 0)
Al Viro5add2ee2013-05-16 01:09:37 -0400172 continue;
173
174 tloc = lelb_to_cpu(cfi.icb.extLocation);
Jan Kara3ee30392014-12-18 22:49:12 +0100175 iblock = udf_get_lb_pblock(sb, &tloc, 0);
Al Viro5add2ee2013-05-16 01:09:37 -0400176 if (!dir_emit(ctx, fname, flen, iblock, DT_UNKNOWN))
Jan Karab80697c2008-03-04 14:14:05 +0100177 goto out;
Cyrill Gorcunov28de7942007-07-21 04:37:18 -0700178 } /* end while */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700179
Al Viro5add2ee2013-05-16 01:09:37 -0400180 ctx->pos = (nf_pos >> 2) + 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700181
Jan Karab80697c2008-03-04 14:14:05 +0100182out:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700183 if (fibh.sbh != fibh.ebh)
Jan Kara3bf25cb2007-05-08 00:35:16 -0700184 brelse(fibh.ebh);
185 brelse(fibh.sbh);
186 brelse(epos.bh);
Jan Karab80697c2008-03-04 14:14:05 +0100187 kfree(fname);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700188
Jan Karab80697c2008-03-04 14:14:05 +0100189 return ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700190}
Marcin Slusarz934c5e62008-02-08 04:20:47 -0800191
Marcin Slusarz934c5e62008-02-08 04:20:47 -0800192/* readdir and lookup functions */
193const struct file_operations udf_dir_operations = {
jan Blunckca572722010-05-26 14:44:53 -0700194 .llseek = generic_file_llseek,
Marcin Slusarz934c5e62008-02-08 04:20:47 -0800195 .read = generic_read_dir,
Al Viro5add2ee2013-05-16 01:09:37 -0400196 .iterate = udf_readdir,
John Kacur2f07a882010-05-05 15:15:39 +0200197 .unlocked_ioctl = udf_ioctl,
Christoph Hellwig1b061d92010-05-26 17:53:41 +0200198 .fsync = generic_file_fsync,
Marcin Slusarz934c5e62008-02-08 04:20:47 -0800199};