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