blob: 6fd831413c9ade7855640a124150e6e064794c50 [file] [log] [blame]
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
39/* Prototypes for file operations */
40static int udf_readdir(struct file *, void *, filldir_t);
41static int do_udf_readdir(struct inode *, struct file *, filldir_t, void *);
42
43/* readdir and lookup functions */
44
Arjan van de Ven4b6f5d22006-03-28 01:56:42 -080045const struct file_operations udf_dir_operations = {
Cyrill Gorcunov28de7942007-07-21 04:37:18 -070046 .read = generic_read_dir,
47 .readdir = udf_readdir,
48 .ioctl = udf_ioctl,
49 .fsync = udf_fsync_file,
Linus Torvalds1da177e2005-04-16 15:20:36 -070050};
51
52/*
53 * udf_readdir
54 *
55 * PURPOSE
56 * Read a directory entry.
57 *
58 * DESCRIPTION
59 * Optional - sys_getdents() will return -ENOTDIR if this routine is not
60 * available.
61 *
62 * Refer to sys_getdents() in fs/readdir.c
63 * sys_getdents() -> .
64 *
65 * PRE-CONDITIONS
66 * filp Pointer to directory file.
67 * buf Pointer to directory entry buffer.
68 * filldir Pointer to filldir function.
69 *
70 * POST-CONDITIONS
71 * <return> >=0 on success.
72 *
73 * HISTORY
74 * July 1, 1997 - Andrew E. Mileski
75 * Written, tested, and released.
76 */
77
78int udf_readdir(struct file *filp, void *dirent, filldir_t filldir)
79{
Josef Sipek5096e932006-12-08 02:37:44 -080080 struct inode *dir = filp->f_path.dentry->d_inode;
Linus Torvalds1da177e2005-04-16 15:20:36 -070081 int result;
82
83 lock_kernel();
84
Cyrill Gorcunovcb00ea32007-07-19 01:47:43 -070085 if (filp->f_pos == 0) {
Cyrill Gorcunov28de7942007-07-21 04:37:18 -070086 if (filldir(dirent, ".", 1, filp->f_pos, dir->i_ino, DT_DIR) < 0) {
Linus Torvalds1da177e2005-04-16 15:20:36 -070087 unlock_kernel();
88 return 0;
89 }
Cyrill Gorcunovcb00ea32007-07-19 01:47:43 -070090 filp->f_pos++;
Linus Torvalds1da177e2005-04-16 15:20:36 -070091 }
92
93 result = do_udf_readdir(dir, filp, filldir, dirent);
94 unlock_kernel();
Cyrill Gorcunov28de7942007-07-21 04:37:18 -070095 return result;
Linus Torvalds1da177e2005-04-16 15:20:36 -070096}
97
Cyrill Gorcunovcb00ea32007-07-19 01:47:43 -070098static int
99do_udf_readdir(struct inode *dir, struct file *filp, filldir_t filldir,
100 void *dirent)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700101{
102 struct udf_fileident_bh fibh;
Cyrill Gorcunovcb00ea32007-07-19 01:47:43 -0700103 struct fileIdentDesc *fi = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700104 struct fileIdentDesc cfi;
105 int block, iblock;
106 loff_t nf_pos = filp->f_pos - 1;
107 int flen;
108 char fname[UDF_NAME_LEN];
109 char *nameptr;
110 uint16_t liu;
111 uint8_t lfi;
112 loff_t size = (udf_ext0_offset(dir) + dir->i_size) >> 2;
Jan Karaff116fc2007-05-08 00:35:14 -0700113 struct buffer_head *tmp, *bha[16];
114 kernel_lb_addr eloc;
115 uint32_t elen;
Jan Kara60448b12007-05-08 00:35:13 -0700116 sector_t offset;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700117 int i, num;
118 unsigned int dt_type;
Cyrill Gorcunovcb00ea32007-07-19 01:47:43 -0700119 struct extent_position epos = { NULL, 0, {0, 0} };
Linus Torvalds1da177e2005-04-16 15:20:36 -0700120
121 if (nf_pos >= size)
122 return 0;
123
124 if (nf_pos == 0)
125 nf_pos = (udf_ext0_offset(dir) >> 2);
126
Cyrill Gorcunov28de7942007-07-21 04:37:18 -0700127 fibh.soffset = fibh.eoffset = (nf_pos & ((dir->i_sb->s_blocksize - 1) >> 2)) << 2;
Marcin Slusarzc0b34432008-02-08 04:20:42 -0800128 if (UDF_I(dir)->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700129 fibh.sbh = fibh.ebh = NULL;
Cyrill Gorcunov28de7942007-07-21 04:37:18 -0700130 } else if (inode_bmap(dir, nf_pos >> (dir->i_sb->s_blocksize_bits - 2),
131 &epos, &eloc, &elen, &offset) == (EXT_RECORDED_ALLOCATED >> 30)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700132 block = udf_get_lb_pblock(dir->i_sb, eloc, offset);
Cyrill Gorcunovcb00ea32007-07-19 01:47:43 -0700133 if ((++offset << dir->i_sb->s_blocksize_bits) < elen) {
Marcin Slusarzc0b34432008-02-08 04:20:42 -0800134 if (UDF_I(dir)->i_alloc_type == ICBTAG_FLAG_AD_SHORT)
Jan Karaff116fc2007-05-08 00:35:14 -0700135 epos.offset -= sizeof(short_ad);
Marcin Slusarzc0b34432008-02-08 04:20:42 -0800136 else if (UDF_I(dir)->i_alloc_type ==
137 ICBTAG_FLAG_AD_LONG)
Jan Karaff116fc2007-05-08 00:35:14 -0700138 epos.offset -= sizeof(long_ad);
Cyrill Gorcunov28de7942007-07-21 04:37:18 -0700139 } else {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700140 offset = 0;
Cyrill Gorcunov28de7942007-07-21 04:37:18 -0700141 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700142
Cyrill Gorcunovcb00ea32007-07-19 01:47:43 -0700143 if (!(fibh.sbh = fibh.ebh = udf_tread(dir->i_sb, block))) {
Jan Kara3bf25cb2007-05-08 00:35:16 -0700144 brelse(epos.bh);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700145 return -EIO;
146 }
Cyrill Gorcunovcb00ea32007-07-19 01:47:43 -0700147
148 if (!(offset & ((16 >> (dir->i_sb->s_blocksize_bits - 9)) - 1))) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700149 i = 16 >> (dir->i_sb->s_blocksize_bits - 9);
Cyrill Gorcunovcb00ea32007-07-19 01:47:43 -0700150 if (i + offset > (elen >> dir->i_sb->s_blocksize_bits))
Cyrill Gorcunov28de7942007-07-21 04:37:18 -0700151 i = (elen >> dir->i_sb->s_blocksize_bits) - offset;
Cyrill Gorcunovcb00ea32007-07-19 01:47:43 -0700152 for (num = 0; i > 0; i--) {
Cyrill Gorcunov28de7942007-07-21 04:37:18 -0700153 block = udf_get_lb_pblock(dir->i_sb, eloc, offset + i);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700154 tmp = udf_tgetblk(dir->i_sb, block);
Cyrill Gorcunov28de7942007-07-21 04:37:18 -0700155 if (tmp && !buffer_uptodate(tmp) && !buffer_locked(tmp))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700156 bha[num++] = tmp;
157 else
158 brelse(tmp);
159 }
Cyrill Gorcunovcb00ea32007-07-19 01:47:43 -0700160 if (num) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700161 ll_rw_block(READA, num, bha);
Cyrill Gorcunovcb00ea32007-07-19 01:47:43 -0700162 for (i = 0; i < num; i++)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700163 brelse(bha[i]);
164 }
165 }
Cyrill Gorcunovcb00ea32007-07-19 01:47:43 -0700166 } else {
Jan Kara3bf25cb2007-05-08 00:35:16 -0700167 brelse(epos.bh);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700168 return -ENOENT;
169 }
170
Cyrill Gorcunovcb00ea32007-07-19 01:47:43 -0700171 while (nf_pos < size) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700172 filp->f_pos = nf_pos + 1;
173
Cyrill Gorcunovcb00ea32007-07-19 01:47:43 -0700174 fi = udf_fileident_read(dir, &nf_pos, &fibh, &cfi, &epos, &eloc,
175 &elen, &offset);
Cyrill Gorcunovcb00ea32007-07-19 01:47:43 -0700176 if (!fi) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700177 if (fibh.sbh != fibh.ebh)
Jan Kara3bf25cb2007-05-08 00:35:16 -0700178 brelse(fibh.ebh);
179 brelse(fibh.sbh);
180 brelse(epos.bh);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700181 return 0;
182 }
183
184 liu = le16_to_cpu(cfi.lengthOfImpUse);
185 lfi = cfi.lengthFileIdent;
186
Cyrill Gorcunov28de7942007-07-21 04:37:18 -0700187 if (fibh.sbh == fibh.ebh) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700188 nameptr = fi->fileIdent + liu;
Cyrill Gorcunov28de7942007-07-21 04:37:18 -0700189 } else {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700190 int poffset; /* Unpaded ending offset */
191
Cyrill Gorcunov28de7942007-07-21 04:37:18 -0700192 poffset = fibh.soffset + sizeof(struct fileIdentDesc) + liu + lfi;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700193
Cyrill Gorcunov28de7942007-07-21 04:37:18 -0700194 if (poffset >= lfi) {
195 nameptr = (char *)(fibh.ebh->b_data + poffset - lfi);
196 } else {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700197 nameptr = fname;
Cyrill Gorcunovcb00ea32007-07-19 01:47:43 -0700198 memcpy(nameptr, fi->fileIdent + liu,
199 lfi - poffset);
200 memcpy(nameptr + lfi - poffset,
201 fibh.ebh->b_data, poffset);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700202 }
203 }
204
Cyrill Gorcunovcb00ea32007-07-19 01:47:43 -0700205 if ((cfi.fileCharacteristics & FID_FILE_CHAR_DELETED) != 0) {
206 if (!UDF_QUERY_FLAG(dir->i_sb, UDF_FLAG_UNDELETE))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700207 continue;
208 }
209
Cyrill Gorcunovcb00ea32007-07-19 01:47:43 -0700210 if ((cfi.fileCharacteristics & FID_FILE_CHAR_HIDDEN) != 0) {
211 if (!UDF_QUERY_FLAG(dir->i_sb, UDF_FLAG_UNHIDE))
212 continue;
213 }
214
215 if (cfi.fileCharacteristics & FID_FILE_CHAR_PARENT) {
Josef Sipek5096e932006-12-08 02:37:44 -0800216 iblock = parent_ino(filp->f_path.dentry);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700217 flen = 2;
218 memcpy(fname, "..", flen);
219 dt_type = DT_DIR;
Cyrill Gorcunovcb00ea32007-07-19 01:47:43 -0700220 } else {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700221 kernel_lb_addr tloc = lelb_to_cpu(cfi.icb.extLocation);
222
223 iblock = udf_get_lb_pblock(dir->i_sb, tloc, 0);
224 flen = udf_get_filename(dir->i_sb, nameptr, fname, lfi);
225 dt_type = DT_UNKNOWN;
226 }
227
Cyrill Gorcunovcb00ea32007-07-19 01:47:43 -0700228 if (flen) {
Cyrill Gorcunov28de7942007-07-21 04:37:18 -0700229 if (filldir(dirent, fname, flen, filp->f_pos, iblock, dt_type) < 0) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700230 if (fibh.sbh != fibh.ebh)
Jan Kara3bf25cb2007-05-08 00:35:16 -0700231 brelse(fibh.ebh);
232 brelse(fibh.sbh);
233 brelse(epos.bh);
Cyrill Gorcunov28de7942007-07-21 04:37:18 -0700234 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700235 }
236 }
Cyrill Gorcunov28de7942007-07-21 04:37:18 -0700237 } /* end while */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700238
239 filp->f_pos = nf_pos + 1;
240
241 if (fibh.sbh != fibh.ebh)
Jan Kara3bf25cb2007-05-08 00:35:16 -0700242 brelse(fibh.ebh);
243 brelse(fibh.sbh);
244 brelse(epos.bh);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700245
246 return 0;
247}