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1da177e4 LT |
1 | /* |
2 | * dir.c | |
3 | * | |
4 | * PURPOSE | |
5 | * Directory handling routines for the OSTA-UDF(tm) filesystem. | |
6 | * | |
1da177e4 LT |
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> | |
1da177e4 LT |
33 | #include <linux/buffer_head.h> |
34 | ||
35 | #include "udf_i.h" | |
36 | #include "udf_sb.h" | |
37 | ||
5add2ee1 AV |
38 | |
39 | static int udf_readdir(struct file *file, struct dir_context *ctx) | |
1da177e4 | 40 | { |
5add2ee1 AV |
41 | struct inode *dir = file_inode(file); |
42 | struct udf_inode_info *iinfo = UDF_I(dir); | |
b80697c1 | 43 | struct udf_fileident_bh fibh = { .sbh = NULL, .ebh = NULL}; |
cb00ea35 | 44 | struct fileIdentDesc *fi = NULL; |
1da177e4 LT |
45 | struct fileIdentDesc cfi; |
46 | int block, iblock; | |
5add2ee1 | 47 | loff_t nf_pos; |
1da177e4 | 48 | int flen; |
391e8bbd AV |
49 | unsigned char *fname = NULL; |
50 | unsigned char *nameptr; | |
1da177e4 LT |
51 | uint16_t liu; |
52 | uint8_t lfi; | |
e28d80f1 | 53 | loff_t size = udf_ext0_offset(dir) + dir->i_size; |
ff116fc8 | 54 | struct buffer_head *tmp, *bha[16]; |
5ca4e4be | 55 | struct kernel_lb_addr eloc; |
ff116fc8 | 56 | uint32_t elen; |
60448b1d | 57 | sector_t offset; |
b80697c1 | 58 | int i, num, ret = 0; |
cb00ea35 | 59 | struct extent_position epos = { NULL, 0, {0, 0} }; |
1da177e4 | 60 | |
5add2ee1 AV |
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; | |
1da177e4 | 67 | if (nf_pos >= size) |
b80697c1 JK |
68 | goto out; |
69 | ||
70 | fname = kmalloc(UDF_NAME_LEN, GFP_NOFS); | |
71 | if (!fname) { | |
72 | ret = -ENOMEM; | |
73 | goto out; | |
74 | } | |
1da177e4 LT |
75 | |
76 | if (nf_pos == 0) | |
e28d80f1 | 77 | nf_pos = udf_ext0_offset(dir); |
1da177e4 | 78 | |
e28d80f1 | 79 | fibh.soffset = fibh.eoffset = nf_pos & (dir->i_sb->s_blocksize - 1); |
b80697c1 JK |
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 | } | |
97e961fd | 87 | block = udf_get_lb_pblock(dir->i_sb, &eloc, offset); |
cb00ea35 | 88 | if ((++offset << dir->i_sb->s_blocksize_bits) < elen) { |
48d6d8ff | 89 | if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT) |
5ca4e4be | 90 | epos.offset -= sizeof(struct short_ad); |
48d6d8ff | 91 | else if (iinfo->i_alloc_type == |
c0b34438 | 92 | ICBTAG_FLAG_AD_LONG) |
5ca4e4be | 93 | epos.offset -= sizeof(struct long_ad); |
28de7948 | 94 | } else { |
1da177e4 | 95 | offset = 0; |
28de7948 | 96 | } |
1da177e4 | 97 | |
cb00ea35 | 98 | if (!(fibh.sbh = fibh.ebh = udf_tread(dir->i_sb, block))) { |
b80697c1 JK |
99 | ret = -EIO; |
100 | goto out; | |
1da177e4 | 101 | } |
cb00ea35 CG |
102 | |
103 | if (!(offset & ((16 >> (dir->i_sb->s_blocksize_bits - 9)) - 1))) { | |
1da177e4 | 104 | i = 16 >> (dir->i_sb->s_blocksize_bits - 9); |
cb00ea35 | 105 | if (i + offset > (elen >> dir->i_sb->s_blocksize_bits)) |
28de7948 | 106 | i = (elen >> dir->i_sb->s_blocksize_bits) - offset; |
cb00ea35 | 107 | for (num = 0; i > 0; i--) { |
97e961fd | 108 | block = udf_get_lb_pblock(dir->i_sb, &eloc, offset + i); |
1da177e4 | 109 | tmp = udf_tgetblk(dir->i_sb, block); |
28de7948 | 110 | if (tmp && !buffer_uptodate(tmp) && !buffer_locked(tmp)) |
1da177e4 LT |
111 | bha[num++] = tmp; |
112 | else | |
113 | brelse(tmp); | |
114 | } | |
cb00ea35 | 115 | if (num) { |
1da177e4 | 116 | ll_rw_block(READA, num, bha); |
cb00ea35 | 117 | for (i = 0; i < num; i++) |
1da177e4 LT |
118 | brelse(bha[i]); |
119 | } | |
120 | } | |
1da177e4 LT |
121 | } |
122 | ||
cb00ea35 | 123 | while (nf_pos < size) { |
5add2ee1 AV |
124 | struct kernel_lb_addr tloc; |
125 | ||
126 | ctx->pos = (nf_pos >> 2) + 1; | |
1da177e4 | 127 | |
cb00ea35 CG |
128 | fi = udf_fileident_read(dir, &nf_pos, &fibh, &cfi, &epos, &eloc, |
129 | &elen, &offset); | |
b80697c1 JK |
130 | if (!fi) |
131 | goto out; | |
1da177e4 LT |
132 | |
133 | liu = le16_to_cpu(cfi.lengthOfImpUse); | |
134 | lfi = cfi.lengthFileIdent; | |
135 | ||
28de7948 | 136 | if (fibh.sbh == fibh.ebh) { |
1da177e4 | 137 | nameptr = fi->fileIdent + liu; |
28de7948 | 138 | } else { |
1da177e4 LT |
139 | int poffset; /* Unpaded ending offset */ |
140 | ||
28de7948 | 141 | poffset = fibh.soffset + sizeof(struct fileIdentDesc) + liu + lfi; |
1da177e4 | 142 | |
28de7948 CG |
143 | if (poffset >= lfi) { |
144 | nameptr = (char *)(fibh.ebh->b_data + poffset - lfi); | |
145 | } else { | |
1da177e4 | 146 | nameptr = fname; |
cb00ea35 CG |
147 | memcpy(nameptr, fi->fileIdent + liu, |
148 | lfi - poffset); | |
149 | memcpy(nameptr + lfi - poffset, | |
150 | fibh.ebh->b_data, poffset); | |
1da177e4 LT |
151 | } |
152 | } | |
153 | ||
cb00ea35 CG |
154 | if ((cfi.fileCharacteristics & FID_FILE_CHAR_DELETED) != 0) { |
155 | if (!UDF_QUERY_FLAG(dir->i_sb, UDF_FLAG_UNDELETE)) | |
1da177e4 LT |
156 | continue; |
157 | } | |
cb00ea35 CG |
158 | |
159 | if ((cfi.fileCharacteristics & FID_FILE_CHAR_HIDDEN) != 0) { | |
160 | if (!UDF_QUERY_FLAG(dir->i_sb, UDF_FLAG_UNHIDE)) | |
1da177e4 LT |
161 | continue; |
162 | } | |
163 | ||
cb00ea35 | 164 | if (cfi.fileCharacteristics & FID_FILE_CHAR_PARENT) { |
5add2ee1 AV |
165 | if (!dir_emit_dotdot(file, ctx)) |
166 | goto out; | |
167 | continue; | |
1da177e4 LT |
168 | } |
169 | ||
5add2ee1 AV |
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)) | |
b80697c1 | 177 | goto out; |
28de7948 | 178 | } /* end while */ |
1da177e4 | 179 | |
5add2ee1 | 180 | ctx->pos = (nf_pos >> 2) + 1; |
1da177e4 | 181 | |
b80697c1 | 182 | out: |
1da177e4 | 183 | if (fibh.sbh != fibh.ebh) |
3bf25cb4 JK |
184 | brelse(fibh.ebh); |
185 | brelse(fibh.sbh); | |
186 | brelse(epos.bh); | |
b80697c1 | 187 | kfree(fname); |
1da177e4 | 188 | |
b80697c1 | 189 | return ret; |
1da177e4 | 190 | } |
934c5e60 | 191 | |
934c5e60 MS |
192 | /* readdir and lookup functions */ |
193 | const struct file_operations udf_dir_operations = { | |
ca572727 | 194 | .llseek = generic_file_llseek, |
934c5e60 | 195 | .read = generic_read_dir, |
5add2ee1 | 196 | .iterate = udf_readdir, |
2f07a88b | 197 | .unlocked_ioctl = udf_ioctl, |
1b061d92 | 198 | .fsync = generic_file_fsync, |
934c5e60 | 199 | }; |