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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
38static int do_udf_readdir(struct inode *dir, struct file *filp,
39 filldir_t filldir, void *dirent)
40{
41 struct udf_fileident_bh fibh = { .sbh = NULL, .ebh = NULL};
42 struct fileIdentDesc *fi = NULL;
43 struct fileIdentDesc cfi;
44 int block, iblock;
45 loff_t nf_pos = (filp->f_pos - 1) << 2;
46 int flen;
47 unsigned char *fname = NULL;
48 unsigned char *nameptr;
49 uint16_t liu;
50 uint8_t lfi;
51 loff_t size = udf_ext0_offset(dir) + dir->i_size;
52 struct buffer_head *tmp, *bha[16];
53 struct kernel_lb_addr eloc;
54 uint32_t elen;
55 sector_t offset;
56 int i, num, ret = 0;
57 unsigned int dt_type;
58 struct extent_position epos = { NULL, 0, {0, 0} };
59 struct udf_inode_info *iinfo;
60
61 if (nf_pos >= size)
62 goto out;
63
64 fname = kmalloc(UDF_NAME_LEN, GFP_NOFS);
65 if (!fname) {
66 ret = -ENOMEM;
67 goto out;
68 }
69
70 if (nf_pos == 0)
71 nf_pos = udf_ext0_offset(dir);
72
73 fibh.soffset = fibh.eoffset = nf_pos & (dir->i_sb->s_blocksize - 1);
74 iinfo = UDF_I(dir);
75 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 }
82 block = udf_get_lb_pblock(dir->i_sb, &eloc, offset);
83 if ((++offset << dir->i_sb->s_blocksize_bits) < elen) {
84 if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT)
85 epos.offset -= sizeof(struct short_ad);
86 else if (iinfo->i_alloc_type ==
87 ICBTAG_FLAG_AD_LONG)
88 epos.offset -= sizeof(struct long_ad);
89 } else {
90 offset = 0;
91 }
92
93 if (!(fibh.sbh = fibh.ebh = udf_tread(dir->i_sb, block))) {
94 ret = -EIO;
95 goto out;
96 }
97
98 if (!(offset & ((16 >> (dir->i_sb->s_blocksize_bits - 9)) - 1))) {
99 i = 16 >> (dir->i_sb->s_blocksize_bits - 9);
100 if (i + offset > (elen >> dir->i_sb->s_blocksize_bits))
101 i = (elen >> dir->i_sb->s_blocksize_bits) - offset;
102 for (num = 0; i > 0; i--) {
103 block = udf_get_lb_pblock(dir->i_sb, &eloc, offset + i);
104 tmp = udf_tgetblk(dir->i_sb, block);
105 if (tmp && !buffer_uptodate(tmp) && !buffer_locked(tmp))
106 bha[num++] = tmp;
107 else
108 brelse(tmp);
109 }
110 if (num) {
111 ll_rw_block(READA, num, bha);
112 for (i = 0; i < num; i++)
113 brelse(bha[i]);
114 }
115 }
116 }
117
118 while (nf_pos < size) {
119 filp->f_pos = (nf_pos >> 2) + 1;
120
121 fi = udf_fileident_read(dir, &nf_pos, &fibh, &cfi, &epos, &eloc,
122 &elen, &offset);
123 if (!fi)
124 goto out;
125
126 liu = le16_to_cpu(cfi.lengthOfImpUse);
127 lfi = cfi.lengthFileIdent;
128
129 if (fibh.sbh == fibh.ebh) {
130 nameptr = fi->fileIdent + liu;
131 } else {
132 int poffset; /* Unpaded ending offset */
133
134 poffset = fibh.soffset + sizeof(struct fileIdentDesc) + liu + lfi;
135
136 if (poffset >= lfi) {
137 nameptr = (char *)(fibh.ebh->b_data + poffset - lfi);
138 } else {
139 nameptr = fname;
140 memcpy(nameptr, fi->fileIdent + liu,
141 lfi - poffset);
142 memcpy(nameptr + lfi - poffset,
143 fibh.ebh->b_data, poffset);
144 }
145 }
146
147 if ((cfi.fileCharacteristics & FID_FILE_CHAR_DELETED) != 0) {
148 if (!UDF_QUERY_FLAG(dir->i_sb, UDF_FLAG_UNDELETE))
149 continue;
150 }
151
152 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) {
158 iblock = parent_ino(filp->f_path.dentry);
159 flen = 2;
160 memcpy(fname, "..", flen);
161 dt_type = DT_DIR;
162 } else {
163 struct kernel_lb_addr tloc = lelb_to_cpu(cfi.icb.extLocation);
164
165 iblock = udf_get_lb_pblock(dir->i_sb, &tloc, 0);
166 flen = udf_get_filename(dir->i_sb, nameptr, fname, lfi);
167 dt_type = DT_UNKNOWN;
168 }
169
170 if (flen && filldir(dirent, fname, flen, filp->f_pos,
171 iblock, dt_type) < 0)
172 goto out;
173 } /* end while */
174
175 filp->f_pos = (nf_pos >> 2) + 1;
176
177out:
178 if (fibh.sbh != fibh.ebh)
179 brelse(fibh.ebh);
180 brelse(fibh.sbh);
181 brelse(epos.bh);
182 kfree(fname);
183
184 return ret;
185}
186
187static int udf_readdir(struct file *filp, void *dirent, filldir_t filldir)
188{
189 struct inode *dir = filp->f_path.dentry->d_inode;
190 int result;
191
192 if (filp->f_pos == 0) {
193 if (filldir(dirent, ".", 1, filp->f_pos, dir->i_ino, DT_DIR) < 0) {
194 return 0;
195 }
196 filp->f_pos++;
197 }
198
199 result = do_udf_readdir(dir, filp, filldir, dirent);
200 return result;
201}
202
203/* readdir and lookup functions */
204const struct file_operations udf_dir_operations = {
205 .llseek = generic_file_llseek,
206 .read = generic_read_dir,
207 .readdir = udf_readdir,
208 .unlocked_ioctl = udf_ioctl,
209 .fsync = generic_file_fsync,
210};