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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#include <linux/buffer_head.h>
34
35#include "udf_i.h"
36#include "udf_sb.h"
37
Marcin Slusarz934c5e62008-02-08 04:20:47 -080038static int do_udf_readdir(struct inode *dir, struct file *filp,
39 filldir_t filldir, void *dirent)
Linus Torvalds1da177e2005-04-16 15:20:36 -070040{
Jan Karab80697c2008-03-04 14:14:05 +010041 struct udf_fileident_bh fibh = { .sbh = NULL, .ebh = NULL};
Cyrill Gorcunovcb00ea32007-07-19 01:47:43 -070042 struct fileIdentDesc *fi = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -070043 struct fileIdentDesc cfi;
44 int block, iblock;
Jan Karae28d80f2008-02-13 15:03:33 -080045 loff_t nf_pos = (filp->f_pos - 1) << 2;
Linus Torvalds1da177e2005-04-16 15:20:36 -070046 int flen;
Al Viro391e8bb2010-01-31 21:28:48 -050047 unsigned char *fname = NULL;
48 unsigned char *nameptr;
Linus Torvalds1da177e2005-04-16 15:20:36 -070049 uint16_t liu;
50 uint8_t lfi;
Jan Karae28d80f2008-02-13 15:03:33 -080051 loff_t size = udf_ext0_offset(dir) + dir->i_size;
Jan Karaff116fc2007-05-08 00:35:14 -070052 struct buffer_head *tmp, *bha[16];
Pekka Enberg5ca4e4b2008-10-15 12:28:03 +020053 struct kernel_lb_addr eloc;
Jan Karaff116fc2007-05-08 00:35:14 -070054 uint32_t elen;
Jan Kara60448b12007-05-08 00:35:13 -070055 sector_t offset;
Jan Karab80697c2008-03-04 14:14:05 +010056 int i, num, ret = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -070057 unsigned int dt_type;
Cyrill Gorcunovcb00ea32007-07-19 01:47:43 -070058 struct extent_position epos = { NULL, 0, {0, 0} };
Marcin Slusarz48d6d8f2008-02-08 04:20:44 -080059 struct udf_inode_info *iinfo;
Linus Torvalds1da177e2005-04-16 15:20:36 -070060
61 if (nf_pos >= size)
Jan Karab80697c2008-03-04 14:14:05 +010062 goto out;
63
64 fname = kmalloc(UDF_NAME_LEN, GFP_NOFS);
65 if (!fname) {
66 ret = -ENOMEM;
67 goto out;
68 }
Linus Torvalds1da177e2005-04-16 15:20:36 -070069
70 if (nf_pos == 0)
Jan Karae28d80f2008-02-13 15:03:33 -080071 nf_pos = udf_ext0_offset(dir);
Linus Torvalds1da177e2005-04-16 15:20:36 -070072
Jan Karae28d80f2008-02-13 15:03:33 -080073 fibh.soffset = fibh.eoffset = nf_pos & (dir->i_sb->s_blocksize - 1);
Marcin Slusarz48d6d8f2008-02-08 04:20:44 -080074 iinfo = UDF_I(dir);
Jan Karab80697c2008-03-04 14:14:05 +010075 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 }
Pekka Enberg97e961f2008-10-15 12:29:03 +020082 block = udf_get_lb_pblock(dir->i_sb, &eloc, offset);
Cyrill Gorcunovcb00ea32007-07-19 01:47:43 -070083 if ((++offset << dir->i_sb->s_blocksize_bits) < elen) {
Marcin Slusarz48d6d8f2008-02-08 04:20:44 -080084 if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT)
Pekka Enberg5ca4e4b2008-10-15 12:28:03 +020085 epos.offset -= sizeof(struct short_ad);
Marcin Slusarz48d6d8f2008-02-08 04:20:44 -080086 else if (iinfo->i_alloc_type ==
Marcin Slusarzc0b34432008-02-08 04:20:42 -080087 ICBTAG_FLAG_AD_LONG)
Pekka Enberg5ca4e4b2008-10-15 12:28:03 +020088 epos.offset -= sizeof(struct long_ad);
Cyrill Gorcunov28de7942007-07-21 04:37:18 -070089 } else {
Linus Torvalds1da177e2005-04-16 15:20:36 -070090 offset = 0;
Cyrill Gorcunov28de7942007-07-21 04:37:18 -070091 }
Linus Torvalds1da177e2005-04-16 15:20:36 -070092
Cyrill Gorcunovcb00ea32007-07-19 01:47:43 -070093 if (!(fibh.sbh = fibh.ebh = udf_tread(dir->i_sb, block))) {
Jan Karab80697c2008-03-04 14:14:05 +010094 ret = -EIO;
95 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -070096 }
Cyrill Gorcunovcb00ea32007-07-19 01:47:43 -070097
98 if (!(offset & ((16 >> (dir->i_sb->s_blocksize_bits - 9)) - 1))) {
Linus Torvalds1da177e2005-04-16 15:20:36 -070099 i = 16 >> (dir->i_sb->s_blocksize_bits - 9);
Cyrill Gorcunovcb00ea32007-07-19 01:47:43 -0700100 if (i + offset > (elen >> dir->i_sb->s_blocksize_bits))
Cyrill Gorcunov28de7942007-07-21 04:37:18 -0700101 i = (elen >> dir->i_sb->s_blocksize_bits) - offset;
Cyrill Gorcunovcb00ea32007-07-19 01:47:43 -0700102 for (num = 0; i > 0; i--) {
Pekka Enberg97e961f2008-10-15 12:29:03 +0200103 block = udf_get_lb_pblock(dir->i_sb, &eloc, offset + i);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700104 tmp = udf_tgetblk(dir->i_sb, block);
Cyrill Gorcunov28de7942007-07-21 04:37:18 -0700105 if (tmp && !buffer_uptodate(tmp) && !buffer_locked(tmp))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700106 bha[num++] = tmp;
107 else
108 brelse(tmp);
109 }
Cyrill Gorcunovcb00ea32007-07-19 01:47:43 -0700110 if (num) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700111 ll_rw_block(READA, num, bha);
Cyrill Gorcunovcb00ea32007-07-19 01:47:43 -0700112 for (i = 0; i < num; i++)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700113 brelse(bha[i]);
114 }
115 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700116 }
117
Cyrill Gorcunovcb00ea32007-07-19 01:47:43 -0700118 while (nf_pos < size) {
Jan Karae28d80f2008-02-13 15:03:33 -0800119 filp->f_pos = (nf_pos >> 2) + 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700120
Cyrill Gorcunovcb00ea32007-07-19 01:47:43 -0700121 fi = udf_fileident_read(dir, &nf_pos, &fibh, &cfi, &epos, &eloc,
122 &elen, &offset);
Jan Karab80697c2008-03-04 14:14:05 +0100123 if (!fi)
124 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700125
126 liu = le16_to_cpu(cfi.lengthOfImpUse);
127 lfi = cfi.lengthFileIdent;
128
Cyrill Gorcunov28de7942007-07-21 04:37:18 -0700129 if (fibh.sbh == fibh.ebh) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700130 nameptr = fi->fileIdent + liu;
Cyrill Gorcunov28de7942007-07-21 04:37:18 -0700131 } else {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700132 int poffset; /* Unpaded ending offset */
133
Cyrill Gorcunov28de7942007-07-21 04:37:18 -0700134 poffset = fibh.soffset + sizeof(struct fileIdentDesc) + liu + lfi;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700135
Cyrill Gorcunov28de7942007-07-21 04:37:18 -0700136 if (poffset >= lfi) {
137 nameptr = (char *)(fibh.ebh->b_data + poffset - lfi);
138 } else {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700139 nameptr = fname;
Cyrill Gorcunovcb00ea32007-07-19 01:47:43 -0700140 memcpy(nameptr, fi->fileIdent + liu,
141 lfi - poffset);
142 memcpy(nameptr + lfi - poffset,
143 fibh.ebh->b_data, poffset);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700144 }
145 }
146
Cyrill Gorcunovcb00ea32007-07-19 01:47:43 -0700147 if ((cfi.fileCharacteristics & FID_FILE_CHAR_DELETED) != 0) {
148 if (!UDF_QUERY_FLAG(dir->i_sb, UDF_FLAG_UNDELETE))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700149 continue;
150 }
151
Cyrill Gorcunovcb00ea32007-07-19 01:47:43 -0700152 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) {
Josef Sipek5096e932006-12-08 02:37:44 -0800158 iblock = parent_ino(filp->f_path.dentry);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700159 flen = 2;
160 memcpy(fname, "..", flen);
161 dt_type = DT_DIR;
Cyrill Gorcunovcb00ea32007-07-19 01:47:43 -0700162 } else {
Pekka Enberg5ca4e4b2008-10-15 12:28:03 +0200163 struct kernel_lb_addr tloc = lelb_to_cpu(cfi.icb.extLocation);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700164
Pekka Enberg97e961f2008-10-15 12:29:03 +0200165 iblock = udf_get_lb_pblock(dir->i_sb, &tloc, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700166 flen = udf_get_filename(dir->i_sb, nameptr, fname, lfi);
167 dt_type = DT_UNKNOWN;
168 }
169
Jan Karab80697c2008-03-04 14:14:05 +0100170 if (flen && filldir(dirent, fname, flen, filp->f_pos,
171 iblock, dt_type) < 0)
172 goto out;
Cyrill Gorcunov28de7942007-07-21 04:37:18 -0700173 } /* end while */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700174
Jan Karae28d80f2008-02-13 15:03:33 -0800175 filp->f_pos = (nf_pos >> 2) + 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700176
Jan Karab80697c2008-03-04 14:14:05 +0100177out:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700178 if (fibh.sbh != fibh.ebh)
Jan Kara3bf25cb2007-05-08 00:35:16 -0700179 brelse(fibh.ebh);
180 brelse(fibh.sbh);
181 brelse(epos.bh);
Jan Karab80697c2008-03-04 14:14:05 +0100182 kfree(fname);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700183
Jan Karab80697c2008-03-04 14:14:05 +0100184 return ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700185}
Marcin Slusarz934c5e62008-02-08 04:20:47 -0800186
Marcin Slusarz934c5e62008-02-08 04:20:47 -0800187static int udf_readdir(struct file *filp, void *dirent, filldir_t filldir)
188{
Al Viro496ad9a2013-01-23 17:07:38 -0500189 struct inode *dir = file_inode(filp);
Marcin Slusarz934c5e62008-02-08 04:20:47 -0800190 int result;
191
Marcin Slusarz934c5e62008-02-08 04:20:47 -0800192 if (filp->f_pos == 0) {
193 if (filldir(dirent, ".", 1, filp->f_pos, dir->i_ino, DT_DIR) < 0) {
Marcin Slusarz934c5e62008-02-08 04:20:47 -0800194 return 0;
195 }
196 filp->f_pos++;
197 }
198
199 result = do_udf_readdir(dir, filp, filldir, dirent);
Marcin Slusarz934c5e62008-02-08 04:20:47 -0800200 return result;
201}
202
203/* readdir and lookup functions */
204const struct file_operations udf_dir_operations = {
jan Blunckca572722010-05-26 14:44:53 -0700205 .llseek = generic_file_llseek,
Marcin Slusarz934c5e62008-02-08 04:20:47 -0800206 .read = generic_read_dir,
207 .readdir = udf_readdir,
John Kacur2f07a882010-05-05 15:15:39 +0200208 .unlocked_ioctl = udf_ioctl,
Christoph Hellwig1b061d92010-05-26 17:53:41 +0200209 .fsync = generic_file_fsync,
Marcin Slusarz934c5e62008-02-08 04:20:47 -0800210};