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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>
33#include <linux/smp_lock.h>
34#include <linux/buffer_head.h>
35
36#include "udf_i.h"
37#include "udf_sb.h"
38
Marcin Slusarz934c5e62008-02-08 04:20:47 -080039static int do_udf_readdir(struct inode *dir, struct file *filp,
40 filldir_t filldir, void *dirent)
Linus Torvalds1da177e2005-04-16 15:20:36 -070041{
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;
Jan Karae28d80f2008-02-13 15:03:33 -080046 loff_t nf_pos = (filp->f_pos - 1) << 2;
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;
Linus Torvalds1da177e2005-04-16 15:20:36 -070058 unsigned int dt_type;
Cyrill Gorcunovcb00ea32007-07-19 01:47:43 -070059 struct extent_position epos = { NULL, 0, {0, 0} };
Marcin Slusarz48d6d8f2008-02-08 04:20:44 -080060 struct udf_inode_info *iinfo;
Linus Torvalds1da177e2005-04-16 15:20:36 -070061
62 if (nf_pos >= size)
Jan Karab80697c2008-03-04 14:14:05 +010063 goto out;
64
65 fname = kmalloc(UDF_NAME_LEN, GFP_NOFS);
66 if (!fname) {
67 ret = -ENOMEM;
68 goto out;
69 }
Linus Torvalds1da177e2005-04-16 15:20:36 -070070
71 if (nf_pos == 0)
Jan Karae28d80f2008-02-13 15:03:33 -080072 nf_pos = udf_ext0_offset(dir);
Linus Torvalds1da177e2005-04-16 15:20:36 -070073
Jan Karae28d80f2008-02-13 15:03:33 -080074 fibh.soffset = fibh.eoffset = nf_pos & (dir->i_sb->s_blocksize - 1);
Marcin Slusarz48d6d8f2008-02-08 04:20:44 -080075 iinfo = UDF_I(dir);
Jan Karab80697c2008-03-04 14:14:05 +010076 if (iinfo->i_alloc_type != ICBTAG_FLAG_AD_IN_ICB) {
77 if (inode_bmap(dir, nf_pos >> dir->i_sb->s_blocksize_bits,
78 &epos, &eloc, &elen, &offset)
79 != (EXT_RECORDED_ALLOCATED >> 30)) {
80 ret = -ENOENT;
81 goto out;
82 }
Pekka Enberg97e961f2008-10-15 12:29:03 +020083 block = udf_get_lb_pblock(dir->i_sb, &eloc, offset);
Cyrill Gorcunovcb00ea32007-07-19 01:47:43 -070084 if ((++offset << dir->i_sb->s_blocksize_bits) < elen) {
Marcin Slusarz48d6d8f2008-02-08 04:20:44 -080085 if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT)
Pekka Enberg5ca4e4b2008-10-15 12:28:03 +020086 epos.offset -= sizeof(struct short_ad);
Marcin Slusarz48d6d8f2008-02-08 04:20:44 -080087 else if (iinfo->i_alloc_type ==
Marcin Slusarzc0b34432008-02-08 04:20:42 -080088 ICBTAG_FLAG_AD_LONG)
Pekka Enberg5ca4e4b2008-10-15 12:28:03 +020089 epos.offset -= sizeof(struct long_ad);
Cyrill Gorcunov28de7942007-07-21 04:37:18 -070090 } else {
Linus Torvalds1da177e2005-04-16 15:20:36 -070091 offset = 0;
Cyrill Gorcunov28de7942007-07-21 04:37:18 -070092 }
Linus Torvalds1da177e2005-04-16 15:20:36 -070093
Cyrill Gorcunovcb00ea32007-07-19 01:47:43 -070094 if (!(fibh.sbh = fibh.ebh = udf_tread(dir->i_sb, block))) {
Jan Karab80697c2008-03-04 14:14:05 +010095 ret = -EIO;
96 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -070097 }
Cyrill Gorcunovcb00ea32007-07-19 01:47:43 -070098
99 if (!(offset & ((16 >> (dir->i_sb->s_blocksize_bits - 9)) - 1))) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700100 i = 16 >> (dir->i_sb->s_blocksize_bits - 9);
Cyrill Gorcunovcb00ea32007-07-19 01:47:43 -0700101 if (i + offset > (elen >> dir->i_sb->s_blocksize_bits))
Cyrill Gorcunov28de7942007-07-21 04:37:18 -0700102 i = (elen >> dir->i_sb->s_blocksize_bits) - offset;
Cyrill Gorcunovcb00ea32007-07-19 01:47:43 -0700103 for (num = 0; i > 0; i--) {
Pekka Enberg97e961f2008-10-15 12:29:03 +0200104 block = udf_get_lb_pblock(dir->i_sb, &eloc, offset + i);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700105 tmp = udf_tgetblk(dir->i_sb, block);
Cyrill Gorcunov28de7942007-07-21 04:37:18 -0700106 if (tmp && !buffer_uptodate(tmp) && !buffer_locked(tmp))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700107 bha[num++] = tmp;
108 else
109 brelse(tmp);
110 }
Cyrill Gorcunovcb00ea32007-07-19 01:47:43 -0700111 if (num) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700112 ll_rw_block(READA, num, bha);
Cyrill Gorcunovcb00ea32007-07-19 01:47:43 -0700113 for (i = 0; i < num; i++)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700114 brelse(bha[i]);
115 }
116 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700117 }
118
Cyrill Gorcunovcb00ea32007-07-19 01:47:43 -0700119 while (nf_pos < size) {
Jan Karae28d80f2008-02-13 15:03:33 -0800120 filp->f_pos = (nf_pos >> 2) + 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700121
Cyrill Gorcunovcb00ea32007-07-19 01:47:43 -0700122 fi = udf_fileident_read(dir, &nf_pos, &fibh, &cfi, &epos, &eloc,
123 &elen, &offset);
Jan Karab80697c2008-03-04 14:14:05 +0100124 if (!fi)
125 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700126
127 liu = le16_to_cpu(cfi.lengthOfImpUse);
128 lfi = cfi.lengthFileIdent;
129
Cyrill Gorcunov28de7942007-07-21 04:37:18 -0700130 if (fibh.sbh == fibh.ebh) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700131 nameptr = fi->fileIdent + liu;
Cyrill Gorcunov28de7942007-07-21 04:37:18 -0700132 } else {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700133 int poffset; /* Unpaded ending offset */
134
Cyrill Gorcunov28de7942007-07-21 04:37:18 -0700135 poffset = fibh.soffset + sizeof(struct fileIdentDesc) + liu + lfi;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700136
Cyrill Gorcunov28de7942007-07-21 04:37:18 -0700137 if (poffset >= lfi) {
138 nameptr = (char *)(fibh.ebh->b_data + poffset - lfi);
139 } else {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700140 nameptr = fname;
Cyrill Gorcunovcb00ea32007-07-19 01:47:43 -0700141 memcpy(nameptr, fi->fileIdent + liu,
142 lfi - poffset);
143 memcpy(nameptr + lfi - poffset,
144 fibh.ebh->b_data, poffset);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700145 }
146 }
147
Cyrill Gorcunovcb00ea32007-07-19 01:47:43 -0700148 if ((cfi.fileCharacteristics & FID_FILE_CHAR_DELETED) != 0) {
149 if (!UDF_QUERY_FLAG(dir->i_sb, UDF_FLAG_UNDELETE))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700150 continue;
151 }
152
Cyrill Gorcunovcb00ea32007-07-19 01:47:43 -0700153 if ((cfi.fileCharacteristics & FID_FILE_CHAR_HIDDEN) != 0) {
154 if (!UDF_QUERY_FLAG(dir->i_sb, UDF_FLAG_UNHIDE))
155 continue;
156 }
157
158 if (cfi.fileCharacteristics & FID_FILE_CHAR_PARENT) {
Josef Sipek5096e932006-12-08 02:37:44 -0800159 iblock = parent_ino(filp->f_path.dentry);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700160 flen = 2;
161 memcpy(fname, "..", flen);
162 dt_type = DT_DIR;
Cyrill Gorcunovcb00ea32007-07-19 01:47:43 -0700163 } else {
Pekka Enberg5ca4e4b2008-10-15 12:28:03 +0200164 struct kernel_lb_addr tloc = lelb_to_cpu(cfi.icb.extLocation);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700165
Pekka Enberg97e961f2008-10-15 12:29:03 +0200166 iblock = udf_get_lb_pblock(dir->i_sb, &tloc, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700167 flen = udf_get_filename(dir->i_sb, nameptr, fname, lfi);
168 dt_type = DT_UNKNOWN;
169 }
170
Jan Karab80697c2008-03-04 14:14:05 +0100171 if (flen && filldir(dirent, fname, flen, filp->f_pos,
172 iblock, dt_type) < 0)
173 goto out;
Cyrill Gorcunov28de7942007-07-21 04:37:18 -0700174 } /* end while */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700175
Jan Karae28d80f2008-02-13 15:03:33 -0800176 filp->f_pos = (nf_pos >> 2) + 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700177
Jan Karab80697c2008-03-04 14:14:05 +0100178out:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700179 if (fibh.sbh != fibh.ebh)
Jan Kara3bf25cb2007-05-08 00:35:16 -0700180 brelse(fibh.ebh);
181 brelse(fibh.sbh);
182 brelse(epos.bh);
Jan Karab80697c2008-03-04 14:14:05 +0100183 kfree(fname);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700184
Jan Karab80697c2008-03-04 14:14:05 +0100185 return ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700186}
Marcin Slusarz934c5e62008-02-08 04:20:47 -0800187
Marcin Slusarz934c5e62008-02-08 04:20:47 -0800188static int udf_readdir(struct file *filp, void *dirent, filldir_t filldir)
189{
190 struct inode *dir = filp->f_path.dentry->d_inode;
191 int result;
192
193 lock_kernel();
194
195 if (filp->f_pos == 0) {
196 if (filldir(dirent, ".", 1, filp->f_pos, dir->i_ino, DT_DIR) < 0) {
197 unlock_kernel();
198 return 0;
199 }
200 filp->f_pos++;
201 }
202
203 result = do_udf_readdir(dir, filp, filldir, dirent);
204 unlock_kernel();
205 return result;
206}
207
208/* readdir and lookup functions */
209const struct file_operations udf_dir_operations = {
210 .read = generic_read_dir,
211 .readdir = udf_readdir,
John Kacur2f07a882010-05-05 15:15:39 +0200212 .unlocked_ioctl = udf_ioctl,
Al Viro90de0662009-06-07 15:40:27 -0400213 .fsync = simple_fsync,
Marcin Slusarz934c5e62008-02-08 04:20:47 -0800214};