5 * Directory related functions
8 * E-mail regarding any portion of the Linux UDF file system should be
9 * directed to the development team mailing list (run by majordomo):
10 * linux_udf@hpesjro.fc.hp.com
13 * This file is distributed under the terms of the GNU General Public
14 * License (GPL). Copies of the GPL can be obtained from:
15 * ftp://prep.ai.mit.edu/pub/gnu/GPL
16 * Each contributing author retains all rights to their own work.
23 #include <linux/string.h>
24 #include <linux/buffer_head.h>
28 udf_filead_read(struct inode *dir, uint8_t *tmpad, uint8_t ad_size,
29 kernel_lb_addr fe_loc, int *pos, int *offset,
30 struct buffer_head **bh, int *error)
32 int loffset = *offset;
39 ad = (uint8_t *)(*bh)->b_data + *offset;
44 udf_release_data(*bh);
49 if (*offset == dir->i_sb->s_blocksize)
51 udf_release_data(*bh);
52 block = udf_get_lb_pblock(dir->i_sb, fe_loc, ++*pos);
55 if (!(*bh = udf_tread(dir->i_sb, block)))
58 else if (*offset > dir->i_sb->s_blocksize)
62 remainder = dir->i_sb->s_blocksize - loffset;
63 memcpy((uint8_t *)ad, (*bh)->b_data + loffset, remainder);
65 udf_release_data(*bh);
66 block = udf_get_lb_pblock(dir->i_sb, fe_loc, ++*pos);
69 if (!((*bh) = udf_tread(dir->i_sb, block)))
72 memcpy((uint8_t *)ad + remainder, (*bh)->b_data, ad_size - remainder);
73 *offset = ad_size - remainder;
79 struct fileIdentDesc *
80 udf_fileident_read(struct inode *dir, loff_t *nf_pos,
81 struct udf_fileident_bh *fibh,
82 struct fileIdentDesc *cfi,
83 kernel_lb_addr *bloc, uint32_t *extoffset,
84 kernel_lb_addr *eloc, uint32_t *elen,
85 uint32_t *offset, struct buffer_head **bh)
87 struct fileIdentDesc *fi;
89 struct buffer_head * tmp, * bha[16];
91 fibh->soffset = fibh->eoffset;
93 if (UDF_I_ALLOCTYPE(dir) == ICBTAG_FLAG_AD_IN_ICB)
95 fi = udf_get_fileident(UDF_I_DATA(dir) -
97 sizeof(struct extendedFileEntry) :
98 sizeof(struct fileEntry)),
99 dir->i_sb->s_blocksize, &(fibh->eoffset));
104 *nf_pos += ((fibh->eoffset - fibh->soffset) >> 2);
106 memcpy((uint8_t *)cfi, (uint8_t *)fi, sizeof(struct fileIdentDesc));
111 if (fibh->eoffset == dir->i_sb->s_blocksize)
113 int lextoffset = *extoffset;
115 if (udf_next_aext(dir, bloc, extoffset, eloc, elen, bh, 1) !=
116 (EXT_RECORDED_ALLOCATED >> 30))
121 block = udf_get_lb_pblock(dir->i_sb, *eloc, *offset);
125 if ((*offset << dir->i_sb->s_blocksize_bits) >= *elen)
128 *extoffset = lextoffset;
130 udf_release_data(fibh->sbh);
131 if (!(fibh->sbh = fibh->ebh = udf_tread(dir->i_sb, block)))
133 fibh->soffset = fibh->eoffset = 0;
135 if (!(*offset & ((16 >> (dir->i_sb->s_blocksize_bits - 9))-1)))
137 i = 16 >> (dir->i_sb->s_blocksize_bits - 9);
138 if (i+*offset > (*elen >> dir->i_sb->s_blocksize_bits))
139 i = (*elen >> dir->i_sb->s_blocksize_bits)-*offset;
140 for (num=0; i>0; i--)
142 block = udf_get_lb_pblock(dir->i_sb, *eloc, *offset+i);
143 tmp = udf_tgetblk(dir->i_sb, block);
144 if (tmp && !buffer_uptodate(tmp) && !buffer_locked(tmp))
151 ll_rw_block(READA, num, bha);
152 for (i=0; i<num; i++)
157 else if (fibh->sbh != fibh->ebh)
159 udf_release_data(fibh->sbh);
160 fibh->sbh = fibh->ebh;
163 fi = udf_get_fileident(fibh->sbh->b_data, dir->i_sb->s_blocksize,
169 *nf_pos += ((fibh->eoffset - fibh->soffset) >> 2);
171 if (fibh->eoffset <= dir->i_sb->s_blocksize)
173 memcpy((uint8_t *)cfi, (uint8_t *)fi, sizeof(struct fileIdentDesc));
175 else if (fibh->eoffset > dir->i_sb->s_blocksize)
177 int lextoffset = *extoffset;
179 if (udf_next_aext(dir, bloc, extoffset, eloc, elen, bh, 1) !=
180 (EXT_RECORDED_ALLOCATED >> 30))
185 block = udf_get_lb_pblock(dir->i_sb, *eloc, *offset);
189 if ((*offset << dir->i_sb->s_blocksize_bits) >= *elen)
192 *extoffset = lextoffset;
194 fibh->soffset -= dir->i_sb->s_blocksize;
195 fibh->eoffset -= dir->i_sb->s_blocksize;
197 if (!(fibh->ebh = udf_tread(dir->i_sb, block)))
200 if (sizeof(struct fileIdentDesc) > - fibh->soffset)
204 memcpy((uint8_t *)cfi, (uint8_t *)fi, - fibh->soffset);
205 memcpy((uint8_t *)cfi - fibh->soffset, fibh->ebh->b_data,
206 sizeof(struct fileIdentDesc) + fibh->soffset);
208 fi_len = (sizeof(struct fileIdentDesc) + cfi->lengthFileIdent +
209 le16_to_cpu(cfi->lengthOfImpUse) + 3) & ~3;
211 *nf_pos += ((fi_len - (fibh->eoffset - fibh->soffset)) >> 2);
212 fibh->eoffset = fibh->soffset + fi_len;
216 memcpy((uint8_t *)cfi, (uint8_t *)fi, sizeof(struct fileIdentDesc));
222 struct fileIdentDesc *
223 udf_get_fileident(void * buffer, int bufsize, int * offset)
225 struct fileIdentDesc *fi;
230 if ( (!buffer) || (!offset) ) {
231 udf_debug("invalidparms\n, buffer=%p, offset=%p\n", buffer, offset);
237 if ( (*offset > 0) && (*offset < bufsize) ) {
240 fi=(struct fileIdentDesc *)ptr;
241 if (le16_to_cpu(fi->descTag.tagIdent) != TAG_IDENT_FID)
243 udf_debug("0x%x != TAG_IDENT_FID\n",
244 le16_to_cpu(fi->descTag.tagIdent));
245 udf_debug("offset: %u sizeof: %lu bufsize: %u\n",
246 *offset, (unsigned long)sizeof(struct fileIdentDesc), bufsize);
249 if ( (*offset + sizeof(struct fileIdentDesc)) > bufsize )
251 lengthThisIdent = sizeof(struct fileIdentDesc);
254 lengthThisIdent = sizeof(struct fileIdentDesc) +
255 fi->lengthFileIdent + le16_to_cpu(fi->lengthOfImpUse);
257 /* we need to figure padding, too! */
258 padlen = lengthThisIdent % UDF_NAME_PAD;
260 lengthThisIdent += (UDF_NAME_PAD - padlen);
261 *offset = *offset + lengthThisIdent;
268 udf_get_fileextent(void * buffer, int bufsize, int * offset)
271 struct fileEntry *fe;
274 if ( (!buffer) || (!offset) )
276 printk(KERN_ERR "udf: udf_get_fileextent() invalidparms\n");
280 fe = (struct fileEntry *)buffer;
282 if ( le16_to_cpu(fe->descTag.tagIdent) != TAG_IDENT_FE )
284 udf_debug("0x%x != TAG_IDENT_FE\n",
285 le16_to_cpu(fe->descTag.tagIdent));
289 ptr=(uint8_t *)(fe->extendedAttr) + le32_to_cpu(fe->lengthExtendedAttr);
291 if ( (*offset > 0) && (*offset < le32_to_cpu(fe->lengthAllocDescs)) )
296 ext = (extent_ad *)ptr;
298 *offset = *offset + sizeof(extent_ad);
304 udf_get_fileshortad(uint8_t *ptr, int maxoffset, int *offset, int inc)
308 if ( (!ptr) || (!offset) )
310 printk(KERN_ERR "udf: udf_get_fileshortad() invalidparms\n");
314 if ( (*offset < 0) || ((*offset + sizeof(short_ad)) > maxoffset) )
316 else if ((sa = (short_ad *)ptr)->extLength == 0)
320 *offset += sizeof(short_ad);
325 udf_get_filelongad(uint8_t *ptr, int maxoffset, int * offset, int inc)
329 if ( (!ptr) || (!offset) )
331 printk(KERN_ERR "udf: udf_get_filelongad() invalidparms\n");
335 if ( (*offset < 0) || ((*offset + sizeof(long_ad)) > maxoffset) )
337 else if ((la = (long_ad *)ptr)->extLength == 0)
341 *offset += sizeof(long_ad);