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>
19 #include <linux/buffer_head.h>
22 static uint8_t *udf_filead_read(struct inode *dir, uint8_t *tmpad,
23 uint8_t ad_size, kernel_lb_addr fe_loc,
24 int *pos, int *offset, struct buffer_head **bh,
27 int loffset = *offset;
34 ad = (uint8_t *)(*bh)->b_data + *offset;
43 if (*offset == dir->i_sb->s_blocksize) {
45 block = udf_get_lb_pblock(dir->i_sb, fe_loc, ++*pos);
48 *bh = udf_tread(dir->i_sb, block);
51 } else if (*offset > dir->i_sb->s_blocksize) {
54 remainder = dir->i_sb->s_blocksize - loffset;
55 memcpy((uint8_t *)ad, (*bh)->b_data + loffset, remainder);
58 block = udf_get_lb_pblock(dir->i_sb, fe_loc, ++*pos);
61 (*bh) = udf_tread(dir->i_sb, block);
65 memcpy((uint8_t *)ad + remainder, (*bh)->b_data,
67 *offset = ad_size - remainder;
74 struct fileIdentDesc *udf_fileident_read(struct inode *dir, loff_t *nf_pos,
75 struct udf_fileident_bh *fibh,
76 struct fileIdentDesc *cfi,
77 struct extent_position *epos,
78 kernel_lb_addr *eloc, uint32_t *elen,
81 struct fileIdentDesc *fi;
83 struct buffer_head *tmp, *bha[16];
84 struct udf_inode_info *iinfo = UDF_I(dir);
86 fibh->soffset = fibh->eoffset;
88 if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) {
89 fi = udf_get_fileident(iinfo->i_ext.i_data -
91 sizeof(struct extendedFileEntry) :
92 sizeof(struct fileEntry)),
93 dir->i_sb->s_blocksize,
98 *nf_pos += fibh->eoffset - fibh->soffset;
100 memcpy((uint8_t *)cfi, (uint8_t *)fi,
101 sizeof(struct fileIdentDesc));
106 if (fibh->eoffset == dir->i_sb->s_blocksize) {
107 int lextoffset = epos->offset;
108 unsigned char blocksize_bits = dir->i_sb->s_blocksize_bits;
110 if (udf_next_aext(dir, epos, eloc, elen, 1) !=
111 (EXT_RECORDED_ALLOCATED >> 30))
114 block = udf_get_lb_pblock(dir->i_sb, *eloc, *offset);
118 if ((*offset << blocksize_bits) >= *elen)
121 epos->offset = lextoffset;
124 fibh->sbh = fibh->ebh = udf_tread(dir->i_sb, block);
127 fibh->soffset = fibh->eoffset = 0;
129 if (!(*offset & ((16 >> (blocksize_bits - 9)) - 1))) {
130 i = 16 >> (blocksize_bits - 9);
131 if (i + *offset > (*elen >> blocksize_bits))
132 i = (*elen >> blocksize_bits)-*offset;
133 for (num = 0; i > 0; i--) {
134 block = udf_get_lb_pblock(dir->i_sb, *eloc,
136 tmp = udf_tgetblk(dir->i_sb, block);
137 if (tmp && !buffer_uptodate(tmp) &&
144 ll_rw_block(READA, num, bha);
145 for (i = 0; i < num; i++)
149 } else if (fibh->sbh != fibh->ebh) {
151 fibh->sbh = fibh->ebh;
154 fi = udf_get_fileident(fibh->sbh->b_data, dir->i_sb->s_blocksize,
160 *nf_pos += fibh->eoffset - fibh->soffset;
162 if (fibh->eoffset <= dir->i_sb->s_blocksize) {
163 memcpy((uint8_t *)cfi, (uint8_t *)fi,
164 sizeof(struct fileIdentDesc));
165 } else if (fibh->eoffset > dir->i_sb->s_blocksize) {
166 int lextoffset = epos->offset;
168 if (udf_next_aext(dir, epos, eloc, elen, 1) !=
169 (EXT_RECORDED_ALLOCATED >> 30))
172 block = udf_get_lb_pblock(dir->i_sb, *eloc, *offset);
176 if ((*offset << dir->i_sb->s_blocksize_bits) >= *elen)
179 epos->offset = lextoffset;
181 fibh->soffset -= dir->i_sb->s_blocksize;
182 fibh->eoffset -= dir->i_sb->s_blocksize;
184 fibh->ebh = udf_tread(dir->i_sb, block);
188 if (sizeof(struct fileIdentDesc) > -fibh->soffset) {
191 memcpy((uint8_t *)cfi, (uint8_t *)fi, -fibh->soffset);
192 memcpy((uint8_t *)cfi - fibh->soffset,
194 sizeof(struct fileIdentDesc) + fibh->soffset);
196 fi_len = (sizeof(struct fileIdentDesc) +
197 cfi->lengthFileIdent +
198 le16_to_cpu(cfi->lengthOfImpUse) + 3) & ~3;
200 *nf_pos += fi_len - (fibh->eoffset - fibh->soffset);
201 fibh->eoffset = fibh->soffset + fi_len;
203 memcpy((uint8_t *)cfi, (uint8_t *)fi,
204 sizeof(struct fileIdentDesc));
210 struct fileIdentDesc *udf_get_fileident(void *buffer, int bufsize, int *offset)
212 struct fileIdentDesc *fi;
217 if ((!buffer) || (!offset)) {
218 udf_debug("invalidparms\n, buffer=%p, offset=%p\n", buffer,
225 if ((*offset > 0) && (*offset < bufsize))
227 fi = (struct fileIdentDesc *)ptr;
228 if (fi->descTag.tagIdent != cpu_to_le16(TAG_IDENT_FID)) {
229 udf_debug("0x%x != TAG_IDENT_FID\n",
230 le16_to_cpu(fi->descTag.tagIdent));
231 udf_debug("offset: %u sizeof: %lu bufsize: %u\n",
232 *offset, (unsigned long)sizeof(struct fileIdentDesc),
236 if ((*offset + sizeof(struct fileIdentDesc)) > bufsize)
237 lengthThisIdent = sizeof(struct fileIdentDesc);
239 lengthThisIdent = sizeof(struct fileIdentDesc) +
240 fi->lengthFileIdent + le16_to_cpu(fi->lengthOfImpUse);
242 /* we need to figure padding, too! */
243 padlen = lengthThisIdent % UDF_NAME_PAD;
245 lengthThisIdent += (UDF_NAME_PAD - padlen);
246 *offset = *offset + lengthThisIdent;
252 static extent_ad *udf_get_fileextent(void *buffer, int bufsize, int *offset)
255 struct fileEntry *fe;
258 if ((!buffer) || (!offset)) {
259 printk(KERN_ERR "udf: udf_get_fileextent() invalidparms\n");
263 fe = (struct fileEntry *)buffer;
265 if (fe->descTag.tagIdent != cpu_to_le16(TAG_IDENT_FE)) {
266 udf_debug("0x%x != TAG_IDENT_FE\n",
267 le16_to_cpu(fe->descTag.tagIdent));
271 ptr = (uint8_t *)(fe->extendedAttr) +
272 le32_to_cpu(fe->lengthExtendedAttr);
274 if ((*offset > 0) && (*offset < le32_to_cpu(fe->lengthAllocDescs)))
277 ext = (extent_ad *)ptr;
279 *offset = *offset + sizeof(extent_ad);
284 short_ad *udf_get_fileshortad(uint8_t *ptr, int maxoffset, uint32_t *offset,
289 if ((!ptr) || (!offset)) {
290 printk(KERN_ERR "udf: udf_get_fileshortad() invalidparms\n");
294 if ((*offset + sizeof(short_ad)) > maxoffset)
297 sa = (short_ad *)ptr;
298 if (sa->extLength == 0)
303 *offset += sizeof(short_ad);
307 long_ad *udf_get_filelongad(uint8_t *ptr, int maxoffset, uint32_t *offset, int inc)
311 if ((!ptr) || (!offset)) {
312 printk(KERN_ERR "udf: udf_get_filelongad() invalidparms\n");
316 if ((*offset + sizeof(long_ad)) > maxoffset)
320 if (la->extLength == 0)
325 *offset += sizeof(long_ad);