Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* |
2 | * directory.c | |
3 | * | |
4 | * PURPOSE | |
5 | * Directory related functions | |
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 | ||
14 | #include "udfdecl.h" | |
15 | #include "udf_i.h" | |
16 | ||
17 | #include <linux/fs.h> | |
18 | #include <linux/string.h> | |
2f8b5444 | 19 | #include <linux/bio.h> |
1da177e4 | 20 | |
4b11111a | 21 | struct fileIdentDesc *udf_fileident_read(struct inode *dir, loff_t *nf_pos, |
cb00ea35 CG |
22 | struct udf_fileident_bh *fibh, |
23 | struct fileIdentDesc *cfi, | |
24 | struct extent_position *epos, | |
5ca4e4be | 25 | struct kernel_lb_addr *eloc, uint32_t *elen, |
4b11111a | 26 | sector_t *offset) |
1da177e4 LT |
27 | { |
28 | struct fileIdentDesc *fi; | |
b490bdd6 SM |
29 | int i, num; |
30 | udf_pblk_t block; | |
cb00ea35 | 31 | struct buffer_head *tmp, *bha[16]; |
48d6d8ff | 32 | struct udf_inode_info *iinfo = UDF_I(dir); |
1da177e4 LT |
33 | |
34 | fibh->soffset = fibh->eoffset; | |
35 | ||
48d6d8ff MS |
36 | if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) { |
37 | fi = udf_get_fileident(iinfo->i_ext.i_data - | |
38 | (iinfo->i_efe ? | |
cb00ea35 CG |
39 | sizeof(struct extendedFileEntry) : |
40 | sizeof(struct fileEntry)), | |
4b11111a MS |
41 | dir->i_sb->s_blocksize, |
42 | &(fibh->eoffset)); | |
1da177e4 LT |
43 | if (!fi) |
44 | return NULL; | |
45 | ||
af793295 | 46 | *nf_pos += fibh->eoffset - fibh->soffset; |
1da177e4 | 47 | |
28de7948 | 48 | memcpy((uint8_t *)cfi, (uint8_t *)fi, |
cb00ea35 | 49 | sizeof(struct fileIdentDesc)); |
1da177e4 LT |
50 | |
51 | return fi; | |
52 | } | |
53 | ||
cb00ea35 | 54 | if (fibh->eoffset == dir->i_sb->s_blocksize) { |
ff116fc8 | 55 | int lextoffset = epos->offset; |
4b11111a | 56 | unsigned char blocksize_bits = dir->i_sb->s_blocksize_bits; |
1da177e4 | 57 | |
ff116fc8 | 58 | if (udf_next_aext(dir, epos, eloc, elen, 1) != |
cb00ea35 | 59 | (EXT_RECORDED_ALLOCATED >> 30)) |
1da177e4 | 60 | return NULL; |
1da177e4 | 61 | |
97e961fd | 62 | block = udf_get_lb_pblock(dir->i_sb, eloc, *offset); |
1da177e4 | 63 | |
cb00ea35 | 64 | (*offset)++; |
1da177e4 | 65 | |
4b11111a | 66 | if ((*offset << blocksize_bits) >= *elen) |
1da177e4 LT |
67 | *offset = 0; |
68 | else | |
ff116fc8 | 69 | epos->offset = lextoffset; |
1da177e4 | 70 | |
3bf25cb4 | 71 | brelse(fibh->sbh); |
4b11111a MS |
72 | fibh->sbh = fibh->ebh = udf_tread(dir->i_sb, block); |
73 | if (!fibh->sbh) | |
1da177e4 LT |
74 | return NULL; |
75 | fibh->soffset = fibh->eoffset = 0; | |
76 | ||
4b11111a MS |
77 | if (!(*offset & ((16 >> (blocksize_bits - 9)) - 1))) { |
78 | i = 16 >> (blocksize_bits - 9); | |
79 | if (i + *offset > (*elen >> blocksize_bits)) | |
80 | i = (*elen >> blocksize_bits)-*offset; | |
cb00ea35 | 81 | for (num = 0; i > 0; i--) { |
97e961fd | 82 | block = udf_get_lb_pblock(dir->i_sb, eloc, |
4b11111a | 83 | *offset + i); |
1da177e4 | 84 | tmp = udf_tgetblk(dir->i_sb, block); |
4b11111a MS |
85 | if (tmp && !buffer_uptodate(tmp) && |
86 | !buffer_locked(tmp)) | |
1da177e4 LT |
87 | bha[num++] = tmp; |
88 | else | |
89 | brelse(tmp); | |
90 | } | |
cb00ea35 | 91 | if (num) { |
70246286 | 92 | ll_rw_block(REQ_OP_READ, REQ_RAHEAD, num, bha); |
cb00ea35 | 93 | for (i = 0; i < num; i++) |
1da177e4 LT |
94 | brelse(bha[i]); |
95 | } | |
96 | } | |
cb00ea35 | 97 | } else if (fibh->sbh != fibh->ebh) { |
3bf25cb4 | 98 | brelse(fibh->sbh); |
1da177e4 LT |
99 | fibh->sbh = fibh->ebh; |
100 | } | |
101 | ||
102 | fi = udf_get_fileident(fibh->sbh->b_data, dir->i_sb->s_blocksize, | |
cb00ea35 | 103 | &(fibh->eoffset)); |
1da177e4 LT |
104 | |
105 | if (!fi) | |
106 | return NULL; | |
107 | ||
af793295 | 108 | *nf_pos += fibh->eoffset - fibh->soffset; |
1da177e4 | 109 | |
cb00ea35 | 110 | if (fibh->eoffset <= dir->i_sb->s_blocksize) { |
28de7948 | 111 | memcpy((uint8_t *)cfi, (uint8_t *)fi, |
cb00ea35 CG |
112 | sizeof(struct fileIdentDesc)); |
113 | } else if (fibh->eoffset > dir->i_sb->s_blocksize) { | |
ff116fc8 | 114 | int lextoffset = epos->offset; |
1da177e4 | 115 | |
ff116fc8 | 116 | if (udf_next_aext(dir, epos, eloc, elen, 1) != |
cb00ea35 | 117 | (EXT_RECORDED_ALLOCATED >> 30)) |
1da177e4 | 118 | return NULL; |
1da177e4 | 119 | |
97e961fd | 120 | block = udf_get_lb_pblock(dir->i_sb, eloc, *offset); |
1da177e4 | 121 | |
cb00ea35 | 122 | (*offset)++; |
1da177e4 LT |
123 | |
124 | if ((*offset << dir->i_sb->s_blocksize_bits) >= *elen) | |
125 | *offset = 0; | |
126 | else | |
ff116fc8 | 127 | epos->offset = lextoffset; |
1da177e4 LT |
128 | |
129 | fibh->soffset -= dir->i_sb->s_blocksize; | |
130 | fibh->eoffset -= dir->i_sb->s_blocksize; | |
131 | ||
4b11111a MS |
132 | fibh->ebh = udf_tread(dir->i_sb, block); |
133 | if (!fibh->ebh) | |
1da177e4 LT |
134 | return NULL; |
135 | ||
cb00ea35 | 136 | if (sizeof(struct fileIdentDesc) > -fibh->soffset) { |
1da177e4 LT |
137 | int fi_len; |
138 | ||
28de7948 | 139 | memcpy((uint8_t *)cfi, (uint8_t *)fi, -fibh->soffset); |
4b11111a MS |
140 | memcpy((uint8_t *)cfi - fibh->soffset, |
141 | fibh->ebh->b_data, | |
cb00ea35 | 142 | sizeof(struct fileIdentDesc) + fibh->soffset); |
1da177e4 | 143 | |
4b11111a MS |
144 | fi_len = (sizeof(struct fileIdentDesc) + |
145 | cfi->lengthFileIdent + | |
28de7948 | 146 | le16_to_cpu(cfi->lengthOfImpUse) + 3) & ~3; |
1da177e4 | 147 | |
af793295 | 148 | *nf_pos += fi_len - (fibh->eoffset - fibh->soffset); |
1da177e4 | 149 | fibh->eoffset = fibh->soffset + fi_len; |
cb00ea35 | 150 | } else { |
28de7948 | 151 | memcpy((uint8_t *)cfi, (uint8_t *)fi, |
cb00ea35 | 152 | sizeof(struct fileIdentDesc)); |
1da177e4 LT |
153 | } |
154 | } | |
155 | return fi; | |
156 | } | |
157 | ||
cb00ea35 | 158 | struct fileIdentDesc *udf_get_fileident(void *buffer, int bufsize, int *offset) |
1da177e4 LT |
159 | { |
160 | struct fileIdentDesc *fi; | |
161 | int lengthThisIdent; | |
cb00ea35 | 162 | uint8_t *ptr; |
1da177e4 LT |
163 | int padlen; |
164 | ||
cb00ea35 | 165 | if ((!buffer) || (!offset)) { |
a983f368 JP |
166 | udf_debug("invalidparms, buffer=%p, offset=%p\n", |
167 | buffer, offset); | |
1da177e4 LT |
168 | return NULL; |
169 | } | |
170 | ||
171 | ptr = buffer; | |
172 | ||
4b11111a | 173 | if ((*offset > 0) && (*offset < bufsize)) |
1da177e4 | 174 | ptr += *offset; |
cb00ea35 | 175 | fi = (struct fileIdentDesc *)ptr; |
5e0f0017 | 176 | if (fi->descTag.tagIdent != cpu_to_le16(TAG_IDENT_FID)) { |
1da177e4 | 177 | udf_debug("0x%x != TAG_IDENT_FID\n", |
cb00ea35 | 178 | le16_to_cpu(fi->descTag.tagIdent)); |
1da177e4 | 179 | udf_debug("offset: %u sizeof: %lu bufsize: %u\n", |
cb00ea35 CG |
180 | *offset, (unsigned long)sizeof(struct fileIdentDesc), |
181 | bufsize); | |
1da177e4 LT |
182 | return NULL; |
183 | } | |
4b11111a | 184 | if ((*offset + sizeof(struct fileIdentDesc)) > bufsize) |
1da177e4 | 185 | lengthThisIdent = sizeof(struct fileIdentDesc); |
4b11111a | 186 | else |
1da177e4 | 187 | lengthThisIdent = sizeof(struct fileIdentDesc) + |
28de7948 | 188 | fi->lengthFileIdent + le16_to_cpu(fi->lengthOfImpUse); |
1da177e4 LT |
189 | |
190 | /* we need to figure padding, too! */ | |
191 | padlen = lengthThisIdent % UDF_NAME_PAD; | |
192 | if (padlen) | |
193 | lengthThisIdent += (UDF_NAME_PAD - padlen); | |
194 | *offset = *offset + lengthThisIdent; | |
195 | ||
196 | return fi; | |
197 | } | |
198 | ||
5ca4e4be | 199 | struct short_ad *udf_get_fileshortad(uint8_t *ptr, int maxoffset, uint32_t *offset, |
cb00ea35 | 200 | int inc) |
1da177e4 | 201 | { |
5ca4e4be | 202 | struct short_ad *sa; |
1da177e4 | 203 | |
cb00ea35 | 204 | if ((!ptr) || (!offset)) { |
78ace70c | 205 | pr_err("%s: invalidparms\n", __func__); |
1da177e4 LT |
206 | return NULL; |
207 | } | |
208 | ||
5ca4e4be | 209 | if ((*offset + sizeof(struct short_ad)) > maxoffset) |
1da177e4 | 210 | return NULL; |
4b11111a | 211 | else { |
5ca4e4be | 212 | sa = (struct short_ad *)ptr; |
4b11111a MS |
213 | if (sa->extLength == 0) |
214 | return NULL; | |
215 | } | |
1da177e4 LT |
216 | |
217 | if (inc) | |
5ca4e4be | 218 | *offset += sizeof(struct short_ad); |
1da177e4 LT |
219 | return sa; |
220 | } | |
221 | ||
5ca4e4be | 222 | struct long_ad *udf_get_filelongad(uint8_t *ptr, int maxoffset, uint32_t *offset, int inc) |
1da177e4 | 223 | { |
5ca4e4be | 224 | struct long_ad *la; |
1da177e4 | 225 | |
cb00ea35 | 226 | if ((!ptr) || (!offset)) { |
78ace70c | 227 | pr_err("%s: invalidparms\n", __func__); |
1da177e4 LT |
228 | return NULL; |
229 | } | |
230 | ||
5ca4e4be | 231 | if ((*offset + sizeof(struct long_ad)) > maxoffset) |
1da177e4 | 232 | return NULL; |
4b11111a | 233 | else { |
5ca4e4be | 234 | la = (struct long_ad *)ptr; |
4b11111a MS |
235 | if (la->extLength == 0) |
236 | return NULL; | |
237 | } | |
1da177e4 LT |
238 | |
239 | if (inc) | |
5ca4e4be | 240 | *offset += sizeof(struct long_ad); |
1da177e4 LT |
241 | return la; |
242 | } |