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1/*
2 * dir.c
3 *
4 * PURPOSE
5 * Directory handling routines for the OSTA-UDF(tm) filesystem.
6 *
7 * 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/bio.h>
34
35#include "udf_i.h"
36#include "udf_sb.h"
37
38
39static int udf_readdir(struct file *file, struct dir_context *ctx)
40{
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;
46 int block, iblock;
47 loff_t nf_pos;
48 int flen;
49 unsigned char *fname = NULL, *copy_name = NULL;
50 unsigned char *nameptr;
51 uint16_t liu;
52 uint8_t lfi;
53 loff_t size = udf_ext0_offset(dir) + dir->i_size;
54 struct buffer_head *tmp, *bha[16];
55 struct kernel_lb_addr eloc;
56 uint32_t elen;
57 sector_t offset;
58 int i, num, ret = 0;
59 struct extent_position epos = { NULL, 0, {0, 0} };
60 struct super_block *sb = dir->i_sb;
61
62 if (ctx->pos == 0) {
63 if (!dir_emit_dot(file, ctx))
64 return 0;
65 ctx->pos = 1;
66 }
67 nf_pos = (ctx->pos - 1) << 2;
68 if (nf_pos >= size)
69 goto out;
70
71 fname = kmalloc(UDF_NAME_LEN, GFP_NOFS);
72 if (!fname) {
73 ret = -ENOMEM;
74 goto out;
75 }
76
77 if (nf_pos == 0)
78 nf_pos = udf_ext0_offset(dir);
79
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)) {
85 ret = -ENOENT;
86 goto out;
87 }
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 ==
93 ICBTAG_FLAG_AD_LONG)
94 epos.offset -= sizeof(struct long_ad);
95 } else {
96 offset = 0;
97 }
98
99 if (!(fibh.sbh = fibh.ebh = udf_tread(sb, block))) {
100 ret = -EIO;
101 goto out;
102 }
103
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))
112 bha[num++] = tmp;
113 else
114 brelse(tmp);
115 }
116 if (num) {
117 ll_rw_block(REQ_OP_READ, REQ_RAHEAD, num, bha);
118 for (i = 0; i < num; i++)
119 brelse(bha[i]);
120 }
121 }
122 }
123
124 while (nf_pos < size) {
125 struct kernel_lb_addr tloc;
126
127 ctx->pos = (nf_pos >> 2) + 1;
128
129 fi = udf_fileident_read(dir, &nf_pos, &fibh, &cfi, &epos, &eloc,
130 &elen, &offset);
131 if (!fi)
132 goto out;
133
134 liu = le16_to_cpu(cfi.lengthOfImpUse);
135 lfi = cfi.lengthFileIdent;
136
137 if (fibh.sbh == fibh.ebh) {
138 nameptr = fi->fileIdent + liu;
139 } else {
140 int poffset; /* Unpaded ending offset */
141
142 poffset = fibh.soffset + sizeof(struct fileIdentDesc) + liu + lfi;
143
144 if (poffset >= lfi) {
145 nameptr = (char *)(fibh.ebh->b_data + poffset - lfi);
146 } else {
147 if (!copy_name) {
148 copy_name = kmalloc(UDF_NAME_LEN,
149 GFP_NOFS);
150 if (!copy_name) {
151 ret = -ENOMEM;
152 goto out;
153 }
154 }
155 nameptr = copy_name;
156 memcpy(nameptr, fi->fileIdent + liu,
157 lfi - poffset);
158 memcpy(nameptr + lfi - poffset,
159 fibh.ebh->b_data, poffset);
160 }
161 }
162
163 if ((cfi.fileCharacteristics & FID_FILE_CHAR_DELETED) != 0) {
164 if (!UDF_QUERY_FLAG(sb, UDF_FLAG_UNDELETE))
165 continue;
166 }
167
168 if ((cfi.fileCharacteristics & FID_FILE_CHAR_HIDDEN) != 0) {
169 if (!UDF_QUERY_FLAG(sb, UDF_FLAG_UNHIDE))
170 continue;
171 }
172
173 if (cfi.fileCharacteristics & FID_FILE_CHAR_PARENT) {
174 if (!dir_emit_dotdot(file, ctx))
175 goto out;
176 continue;
177 }
178
179 flen = udf_get_filename(sb, nameptr, lfi, fname, UDF_NAME_LEN);
180 if (flen < 0)
181 continue;
182
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))
186 goto out;
187 } /* end while */
188
189 ctx->pos = (nf_pos >> 2) + 1;
190
191out:
192 if (fibh.sbh != fibh.ebh)
193 brelse(fibh.ebh);
194 brelse(fibh.sbh);
195 brelse(epos.bh);
196 kfree(fname);
197 kfree(copy_name);
198
199 return ret;
200}
201
202/* readdir and lookup functions */
203const 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,
209};
1/*
2 * dir.c
3 *
4 * PURPOSE
5 * Directory handling routines for the OSTA-UDF(tm) filesystem.
6 *
7 * 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/buffer_head.h>
34
35#include "udf_i.h"
36#include "udf_sb.h"
37
38
39static int udf_readdir(struct file *file, struct dir_context *ctx)
40{
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;
46 int block, iblock;
47 loff_t nf_pos;
48 int flen;
49 unsigned char *fname = NULL;
50 unsigned char *nameptr;
51 uint16_t liu;
52 uint8_t lfi;
53 loff_t size = udf_ext0_offset(dir) + dir->i_size;
54 struct buffer_head *tmp, *bha[16];
55 struct kernel_lb_addr eloc;
56 uint32_t elen;
57 sector_t offset;
58 int i, num, ret = 0;
59 struct extent_position epos = { NULL, 0, {0, 0} };
60
61 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;
67 if (nf_pos >= size)
68 goto out;
69
70 fname = kmalloc(UDF_NAME_LEN, GFP_NOFS);
71 if (!fname) {
72 ret = -ENOMEM;
73 goto out;
74 }
75
76 if (nf_pos == 0)
77 nf_pos = udf_ext0_offset(dir);
78
79 fibh.soffset = fibh.eoffset = nf_pos & (dir->i_sb->s_blocksize - 1);
80 if (iinfo->i_alloc_type != ICBTAG_FLAG_AD_IN_ICB) {
81 if (inode_bmap(dir, nf_pos >> dir->i_sb->s_blocksize_bits,
82 &epos, &eloc, &elen, &offset)
83 != (EXT_RECORDED_ALLOCATED >> 30)) {
84 ret = -ENOENT;
85 goto out;
86 }
87 block = udf_get_lb_pblock(dir->i_sb, &eloc, offset);
88 if ((++offset << dir->i_sb->s_blocksize_bits) < elen) {
89 if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT)
90 epos.offset -= sizeof(struct short_ad);
91 else if (iinfo->i_alloc_type ==
92 ICBTAG_FLAG_AD_LONG)
93 epos.offset -= sizeof(struct long_ad);
94 } else {
95 offset = 0;
96 }
97
98 if (!(fibh.sbh = fibh.ebh = udf_tread(dir->i_sb, block))) {
99 ret = -EIO;
100 goto out;
101 }
102
103 if (!(offset & ((16 >> (dir->i_sb->s_blocksize_bits - 9)) - 1))) {
104 i = 16 >> (dir->i_sb->s_blocksize_bits - 9);
105 if (i + offset > (elen >> dir->i_sb->s_blocksize_bits))
106 i = (elen >> dir->i_sb->s_blocksize_bits) - offset;
107 for (num = 0; i > 0; i--) {
108 block = udf_get_lb_pblock(dir->i_sb, &eloc, offset + i);
109 tmp = udf_tgetblk(dir->i_sb, block);
110 if (tmp && !buffer_uptodate(tmp) && !buffer_locked(tmp))
111 bha[num++] = tmp;
112 else
113 brelse(tmp);
114 }
115 if (num) {
116 ll_rw_block(READA, num, bha);
117 for (i = 0; i < num; i++)
118 brelse(bha[i]);
119 }
120 }
121 }
122
123 while (nf_pos < size) {
124 struct kernel_lb_addr tloc;
125
126 ctx->pos = (nf_pos >> 2) + 1;
127
128 fi = udf_fileident_read(dir, &nf_pos, &fibh, &cfi, &epos, &eloc,
129 &elen, &offset);
130 if (!fi)
131 goto out;
132
133 liu = le16_to_cpu(cfi.lengthOfImpUse);
134 lfi = cfi.lengthFileIdent;
135
136 if (fibh.sbh == fibh.ebh) {
137 nameptr = fi->fileIdent + liu;
138 } else {
139 int poffset; /* Unpaded ending offset */
140
141 poffset = fibh.soffset + sizeof(struct fileIdentDesc) + liu + lfi;
142
143 if (poffset >= lfi) {
144 nameptr = (char *)(fibh.ebh->b_data + poffset - lfi);
145 } else {
146 nameptr = fname;
147 memcpy(nameptr, fi->fileIdent + liu,
148 lfi - poffset);
149 memcpy(nameptr + lfi - poffset,
150 fibh.ebh->b_data, poffset);
151 }
152 }
153
154 if ((cfi.fileCharacteristics & FID_FILE_CHAR_DELETED) != 0) {
155 if (!UDF_QUERY_FLAG(dir->i_sb, UDF_FLAG_UNDELETE))
156 continue;
157 }
158
159 if ((cfi.fileCharacteristics & FID_FILE_CHAR_HIDDEN) != 0) {
160 if (!UDF_QUERY_FLAG(dir->i_sb, UDF_FLAG_UNHIDE))
161 continue;
162 }
163
164 if (cfi.fileCharacteristics & FID_FILE_CHAR_PARENT) {
165 if (!dir_emit_dotdot(file, ctx))
166 goto out;
167 continue;
168 }
169
170 flen = udf_get_filename(dir->i_sb, nameptr, fname, lfi);
171 if (!flen)
172 continue;
173
174 tloc = lelb_to_cpu(cfi.icb.extLocation);
175 iblock = udf_get_lb_pblock(dir->i_sb, &tloc, 0);
176 if (!dir_emit(ctx, fname, flen, iblock, DT_UNKNOWN))
177 goto out;
178 } /* end while */
179
180 ctx->pos = (nf_pos >> 2) + 1;
181
182out:
183 if (fibh.sbh != fibh.ebh)
184 brelse(fibh.ebh);
185 brelse(fibh.sbh);
186 brelse(epos.bh);
187 kfree(fname);
188
189 return ret;
190}
191
192/* readdir and lookup functions */
193const struct file_operations udf_dir_operations = {
194 .llseek = generic_file_llseek,
195 .read = generic_read_dir,
196 .iterate = udf_readdir,
197 .unlocked_ioctl = udf_ioctl,
198 .fsync = generic_file_fsync,
199};