5 * Directory related functions
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.
18 #include <linux/string.h>
20 struct fileIdentDesc *udf_fileident_read(struct inode *dir, loff_t *nf_pos,
21 struct udf_fileident_bh *fibh,
22 struct fileIdentDesc *cfi,
23 struct extent_position *epos,
24 struct kernel_lb_addr *eloc, uint32_t *elen,
27 struct fileIdentDesc *fi;
29 struct buffer_head *tmp, *bha[16];
30 struct udf_inode_info *iinfo = UDF_I(dir);
32 fibh->soffset = fibh->eoffset;
34 if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) {
35 fi = udf_get_fileident(iinfo->i_ext.i_data -
37 sizeof(struct extendedFileEntry) :
38 sizeof(struct fileEntry)),
39 dir->i_sb->s_blocksize,
44 *nf_pos += fibh->eoffset - fibh->soffset;
46 memcpy((uint8_t *)cfi, (uint8_t *)fi,
47 sizeof(struct fileIdentDesc));
52 if (fibh->eoffset == dir->i_sb->s_blocksize) {
53 int lextoffset = epos->offset;
54 unsigned char blocksize_bits = dir->i_sb->s_blocksize_bits;
56 if (udf_next_aext(dir, epos, eloc, elen, 1) !=
57 (EXT_RECORDED_ALLOCATED >> 30))
60 block = udf_get_lb_pblock(dir->i_sb, eloc, *offset);
64 if ((*offset << blocksize_bits) >= *elen)
67 epos->offset = lextoffset;
70 fibh->sbh = fibh->ebh = udf_tread(dir->i_sb, block);
73 fibh->soffset = fibh->eoffset = 0;
75 if (!(*offset & ((16 >> (blocksize_bits - 9)) - 1))) {
76 i = 16 >> (blocksize_bits - 9);
77 if (i + *offset > (*elen >> blocksize_bits))
78 i = (*elen >> blocksize_bits)-*offset;
79 for (num = 0; i > 0; i--) {
80 block = udf_get_lb_pblock(dir->i_sb, eloc,
82 tmp = udf_tgetblk(dir->i_sb, block);
83 if (tmp && !buffer_uptodate(tmp) &&
90 ll_rw_block(REQ_OP_READ, REQ_RAHEAD, num, bha);
91 for (i = 0; i < num; i++)
95 } else if (fibh->sbh != fibh->ebh) {
97 fibh->sbh = fibh->ebh;
100 fi = udf_get_fileident(fibh->sbh->b_data, dir->i_sb->s_blocksize,
106 *nf_pos += fibh->eoffset - fibh->soffset;
108 if (fibh->eoffset <= dir->i_sb->s_blocksize) {
109 memcpy((uint8_t *)cfi, (uint8_t *)fi,
110 sizeof(struct fileIdentDesc));
111 } else if (fibh->eoffset > dir->i_sb->s_blocksize) {
112 int lextoffset = epos->offset;
114 if (udf_next_aext(dir, epos, eloc, elen, 1) !=
115 (EXT_RECORDED_ALLOCATED >> 30))
118 block = udf_get_lb_pblock(dir->i_sb, eloc, *offset);
122 if ((*offset << dir->i_sb->s_blocksize_bits) >= *elen)
125 epos->offset = lextoffset;
127 fibh->soffset -= dir->i_sb->s_blocksize;
128 fibh->eoffset -= dir->i_sb->s_blocksize;
130 fibh->ebh = udf_tread(dir->i_sb, block);
134 if (sizeof(struct fileIdentDesc) > -fibh->soffset) {
137 memcpy((uint8_t *)cfi, (uint8_t *)fi, -fibh->soffset);
138 memcpy((uint8_t *)cfi - fibh->soffset,
140 sizeof(struct fileIdentDesc) + fibh->soffset);
142 fi_len = (sizeof(struct fileIdentDesc) +
143 cfi->lengthFileIdent +
144 le16_to_cpu(cfi->lengthOfImpUse) + 3) & ~3;
146 *nf_pos += fi_len - (fibh->eoffset - fibh->soffset);
147 fibh->eoffset = fibh->soffset + fi_len;
149 memcpy((uint8_t *)cfi, (uint8_t *)fi,
150 sizeof(struct fileIdentDesc));
156 struct fileIdentDesc *udf_get_fileident(void *buffer, int bufsize, int *offset)
158 struct fileIdentDesc *fi;
163 if ((!buffer) || (!offset)) {
164 udf_debug("invalidparms, buffer=%p, offset=%p\n",
171 if ((*offset > 0) && (*offset < bufsize))
173 fi = (struct fileIdentDesc *)ptr;
174 if (fi->descTag.tagIdent != cpu_to_le16(TAG_IDENT_FID)) {
175 udf_debug("0x%x != TAG_IDENT_FID\n",
176 le16_to_cpu(fi->descTag.tagIdent));
177 udf_debug("offset: %u sizeof: %lu bufsize: %u\n",
178 *offset, (unsigned long)sizeof(struct fileIdentDesc),
182 if ((*offset + sizeof(struct fileIdentDesc)) > bufsize)
183 lengthThisIdent = sizeof(struct fileIdentDesc);
185 lengthThisIdent = sizeof(struct fileIdentDesc) +
186 fi->lengthFileIdent + le16_to_cpu(fi->lengthOfImpUse);
188 /* we need to figure padding, too! */
189 padlen = lengthThisIdent % UDF_NAME_PAD;
191 lengthThisIdent += (UDF_NAME_PAD - padlen);
192 *offset = *offset + lengthThisIdent;
197 struct short_ad *udf_get_fileshortad(uint8_t *ptr, int maxoffset, uint32_t *offset,
202 if ((!ptr) || (!offset)) {
203 pr_err("%s: invalidparms\n", __func__);
207 if ((*offset + sizeof(struct short_ad)) > maxoffset)
210 sa = (struct short_ad *)ptr;
211 if (sa->extLength == 0)
216 *offset += sizeof(struct short_ad);
220 struct long_ad *udf_get_filelongad(uint8_t *ptr, int maxoffset, uint32_t *offset, int inc)
224 if ((!ptr) || (!offset)) {
225 pr_err("%s: invalidparms\n", __func__);
229 if ((*offset + sizeof(struct long_ad)) > maxoffset)
232 la = (struct long_ad *)ptr;
233 if (la->extLength == 0)
238 *offset += sizeof(struct long_ad);