328 lines
7.6 KiB
C
328 lines
7.6 KiB
C
/*
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* directory.c
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*
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* PURPOSE
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* Directory related functions
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*
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* COPYRIGHT
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* This file is distributed under the terms of the GNU General Public
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* License (GPL). Copies of the GPL can be obtained from:
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* ftp://prep.ai.mit.edu/pub/gnu/GPL
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* Each contributing author retains all rights to their own work.
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*/
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#include "udfdecl.h"
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#include "udf_i.h"
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#include <linux/fs.h>
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#include <linux/string.h>
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#include <linux/buffer_head.h>
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#if 0
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static uint8_t *udf_filead_read(struct inode *dir, uint8_t *tmpad,
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uint8_t ad_size, struct kernel_lb_addr fe_loc,
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int *pos, int *offset, struct buffer_head **bh,
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int *error)
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{
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int loffset = *offset;
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int block;
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uint8_t *ad;
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int remainder;
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*error = 0;
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ad = (uint8_t *)(*bh)->b_data + *offset;
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*offset += ad_size;
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if (!ad) {
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brelse(*bh);
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*error = 1;
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return NULL;
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}
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if (*offset == dir->i_sb->s_blocksize) {
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brelse(*bh);
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block = udf_get_lb_pblock(dir->i_sb, fe_loc, ++*pos);
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if (!block)
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return NULL;
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*bh = udf_tread(dir->i_sb, block);
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if (!*bh)
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return NULL;
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} else if (*offset > dir->i_sb->s_blocksize) {
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ad = tmpad;
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remainder = dir->i_sb->s_blocksize - loffset;
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memcpy((uint8_t *)ad, (*bh)->b_data + loffset, remainder);
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brelse(*bh);
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block = udf_get_lb_pblock(dir->i_sb, fe_loc, ++*pos);
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if (!block)
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return NULL;
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(*bh) = udf_tread(dir->i_sb, block);
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if (!*bh)
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return NULL;
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memcpy((uint8_t *)ad + remainder, (*bh)->b_data,
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ad_size - remainder);
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*offset = ad_size - remainder;
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}
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return ad;
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}
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#endif
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struct fileIdentDesc *udf_fileident_read(struct inode *dir, loff_t *nf_pos,
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struct udf_fileident_bh *fibh,
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struct fileIdentDesc *cfi,
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struct extent_position *epos,
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struct kernel_lb_addr *eloc, uint32_t *elen,
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sector_t *offset)
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{
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struct fileIdentDesc *fi;
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int i, num, block;
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struct buffer_head *tmp, *bha[16];
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struct udf_inode_info *iinfo = UDF_I(dir);
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fibh->soffset = fibh->eoffset;
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if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) {
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fi = udf_get_fileident(iinfo->i_ext.i_data -
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(iinfo->i_efe ?
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sizeof(struct extendedFileEntry) :
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sizeof(struct fileEntry)),
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dir->i_sb->s_blocksize,
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&(fibh->eoffset));
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if (!fi)
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return NULL;
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*nf_pos += fibh->eoffset - fibh->soffset;
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memcpy((uint8_t *)cfi, (uint8_t *)fi,
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sizeof(struct fileIdentDesc));
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return fi;
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}
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if (fibh->eoffset == dir->i_sb->s_blocksize) {
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int lextoffset = epos->offset;
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unsigned char blocksize_bits = dir->i_sb->s_blocksize_bits;
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if (udf_next_aext(dir, epos, eloc, elen, 1) !=
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(EXT_RECORDED_ALLOCATED >> 30))
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return NULL;
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block = udf_get_lb_pblock(dir->i_sb, eloc, *offset);
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(*offset)++;
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if ((*offset << blocksize_bits) >= *elen)
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*offset = 0;
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else
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epos->offset = lextoffset;
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brelse(fibh->sbh);
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fibh->sbh = fibh->ebh = udf_tread(dir->i_sb, block);
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if (!fibh->sbh)
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return NULL;
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fibh->soffset = fibh->eoffset = 0;
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if (!(*offset & ((16 >> (blocksize_bits - 9)) - 1))) {
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i = 16 >> (blocksize_bits - 9);
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if (i + *offset > (*elen >> blocksize_bits))
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i = (*elen >> blocksize_bits)-*offset;
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for (num = 0; i > 0; i--) {
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block = udf_get_lb_pblock(dir->i_sb, eloc,
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*offset + i);
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tmp = udf_tgetblk(dir->i_sb, block);
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if (tmp && !buffer_uptodate(tmp) &&
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!buffer_locked(tmp))
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bha[num++] = tmp;
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else
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brelse(tmp);
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}
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if (num) {
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ll_rw_block(READA, num, bha);
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for (i = 0; i < num; i++)
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brelse(bha[i]);
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}
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}
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} else if (fibh->sbh != fibh->ebh) {
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brelse(fibh->sbh);
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fibh->sbh = fibh->ebh;
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}
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fi = udf_get_fileident(fibh->sbh->b_data, dir->i_sb->s_blocksize,
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&(fibh->eoffset));
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if (!fi)
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return NULL;
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*nf_pos += fibh->eoffset - fibh->soffset;
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if (fibh->eoffset <= dir->i_sb->s_blocksize) {
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memcpy((uint8_t *)cfi, (uint8_t *)fi,
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sizeof(struct fileIdentDesc));
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} else if (fibh->eoffset > dir->i_sb->s_blocksize) {
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int lextoffset = epos->offset;
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if (udf_next_aext(dir, epos, eloc, elen, 1) !=
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(EXT_RECORDED_ALLOCATED >> 30))
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return NULL;
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block = udf_get_lb_pblock(dir->i_sb, eloc, *offset);
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(*offset)++;
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if ((*offset << dir->i_sb->s_blocksize_bits) >= *elen)
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*offset = 0;
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else
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epos->offset = lextoffset;
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fibh->soffset -= dir->i_sb->s_blocksize;
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fibh->eoffset -= dir->i_sb->s_blocksize;
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fibh->ebh = udf_tread(dir->i_sb, block);
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if (!fibh->ebh)
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return NULL;
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if (sizeof(struct fileIdentDesc) > -fibh->soffset) {
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int fi_len;
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memcpy((uint8_t *)cfi, (uint8_t *)fi, -fibh->soffset);
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memcpy((uint8_t *)cfi - fibh->soffset,
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fibh->ebh->b_data,
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sizeof(struct fileIdentDesc) + fibh->soffset);
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fi_len = (sizeof(struct fileIdentDesc) +
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cfi->lengthFileIdent +
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le16_to_cpu(cfi->lengthOfImpUse) + 3) & ~3;
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*nf_pos += fi_len - (fibh->eoffset - fibh->soffset);
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fibh->eoffset = fibh->soffset + fi_len;
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} else {
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memcpy((uint8_t *)cfi, (uint8_t *)fi,
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sizeof(struct fileIdentDesc));
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}
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}
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return fi;
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}
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struct fileIdentDesc *udf_get_fileident(void *buffer, int bufsize, int *offset)
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{
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struct fileIdentDesc *fi;
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int lengthThisIdent;
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uint8_t *ptr;
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int padlen;
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if ((!buffer) || (!offset)) {
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udf_debug("invalidparms\n, buffer=%p, offset=%p\n", buffer,
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offset);
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return NULL;
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}
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ptr = buffer;
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if ((*offset > 0) && (*offset < bufsize))
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ptr += *offset;
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fi = (struct fileIdentDesc *)ptr;
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if (fi->descTag.tagIdent != cpu_to_le16(TAG_IDENT_FID)) {
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udf_debug("0x%x != TAG_IDENT_FID\n",
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le16_to_cpu(fi->descTag.tagIdent));
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udf_debug("offset: %u sizeof: %lu bufsize: %u\n",
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*offset, (unsigned long)sizeof(struct fileIdentDesc),
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bufsize);
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return NULL;
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}
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if ((*offset + sizeof(struct fileIdentDesc)) > bufsize)
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lengthThisIdent = sizeof(struct fileIdentDesc);
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else
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lengthThisIdent = sizeof(struct fileIdentDesc) +
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fi->lengthFileIdent + le16_to_cpu(fi->lengthOfImpUse);
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/* we need to figure padding, too! */
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padlen = lengthThisIdent % UDF_NAME_PAD;
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if (padlen)
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lengthThisIdent += (UDF_NAME_PAD - padlen);
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*offset = *offset + lengthThisIdent;
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return fi;
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}
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#if 0
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static struct extent_ad *udf_get_fileextent(void *buffer, int bufsize, int *offset)
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{
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struct extent_ad *ext;
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struct fileEntry *fe;
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uint8_t *ptr;
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if ((!buffer) || (!offset)) {
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printk(KERN_ERR "udf: udf_get_fileextent() invalidparms\n");
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return NULL;
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}
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fe = (struct fileEntry *)buffer;
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if (fe->descTag.tagIdent != cpu_to_le16(TAG_IDENT_FE)) {
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udf_debug("0x%x != TAG_IDENT_FE\n",
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le16_to_cpu(fe->descTag.tagIdent));
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return NULL;
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}
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ptr = (uint8_t *)(fe->extendedAttr) +
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le32_to_cpu(fe->lengthExtendedAttr);
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if ((*offset > 0) && (*offset < le32_to_cpu(fe->lengthAllocDescs)))
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ptr += *offset;
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ext = (struct extent_ad *)ptr;
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*offset = *offset + sizeof(struct extent_ad);
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return ext;
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}
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#endif
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struct short_ad *udf_get_fileshortad(uint8_t *ptr, int maxoffset, uint32_t *offset,
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int inc)
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{
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struct short_ad *sa;
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if ((!ptr) || (!offset)) {
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printk(KERN_ERR "udf: udf_get_fileshortad() invalidparms\n");
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return NULL;
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}
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if ((*offset + sizeof(struct short_ad)) > maxoffset)
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return NULL;
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else {
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sa = (struct short_ad *)ptr;
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if (sa->extLength == 0)
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return NULL;
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}
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if (inc)
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*offset += sizeof(struct short_ad);
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return sa;
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}
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struct long_ad *udf_get_filelongad(uint8_t *ptr, int maxoffset, uint32_t *offset, int inc)
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{
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struct long_ad *la;
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if ((!ptr) || (!offset)) {
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printk(KERN_ERR "udf: udf_get_filelongad() invalidparms\n");
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return NULL;
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}
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if ((*offset + sizeof(struct long_ad)) > maxoffset)
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return NULL;
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else {
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la = (struct long_ad *)ptr;
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if (la->extLength == 0)
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return NULL;
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}
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if (inc)
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*offset += sizeof(struct long_ad);
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return la;
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}
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