| /* |
| * 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> |
| #include <linux/buffer_head.h> |
| |
| #if 0 |
| static uint8_t *udf_filead_read(struct inode *dir, uint8_t *tmpad, |
| uint8_t ad_size, kernel_lb_addr fe_loc, |
| int *pos, int *offset, struct buffer_head **bh, |
| int *error) |
| { |
| int loffset = *offset; |
| int block; |
| uint8_t *ad; |
| int remainder; |
| |
| *error = 0; |
| |
| ad = (uint8_t *)(*bh)->b_data + *offset; |
| *offset += ad_size; |
| |
| if (!ad) { |
| brelse(*bh); |
| *error = 1; |
| return NULL; |
| } |
| |
| if (*offset == dir->i_sb->s_blocksize) { |
| brelse(*bh); |
| block = udf_get_lb_pblock(dir->i_sb, fe_loc, ++*pos); |
| if (!block) |
| return NULL; |
| *bh = udf_tread(dir->i_sb, block); |
| if (!*bh) |
| return NULL; |
| } else if (*offset > dir->i_sb->s_blocksize) { |
| ad = tmpad; |
| |
| remainder = dir->i_sb->s_blocksize - loffset; |
| memcpy((uint8_t *)ad, (*bh)->b_data + loffset, remainder); |
| |
| brelse(*bh); |
| block = udf_get_lb_pblock(dir->i_sb, fe_loc, ++*pos); |
| if (!block) |
| return NULL; |
| (*bh) = udf_tread(dir->i_sb, block); |
| if (!*bh) |
| return NULL; |
| |
| memcpy((uint8_t *)ad + remainder, (*bh)->b_data, |
| ad_size - remainder); |
| *offset = ad_size - remainder; |
| } |
| |
| return ad; |
| } |
| #endif |
| |
| struct fileIdentDesc *udf_fileident_read(struct inode *dir, loff_t *nf_pos, |
| struct udf_fileident_bh *fibh, |
| struct fileIdentDesc *cfi, |
| struct extent_position *epos, |
| 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) >> 2); |
| |
| 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) >> 2); |
| |
| 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)) |
| >> 2; |
| 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\n, 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; |
| } |
| |
| #if 0 |
| static extent_ad *udf_get_fileextent(void *buffer, int bufsize, int *offset) |
| { |
| extent_ad *ext; |
| struct fileEntry *fe; |
| uint8_t *ptr; |
| |
| if ((!buffer) || (!offset)) { |
| printk(KERN_ERR "udf: udf_get_fileextent() invalidparms\n"); |
| return NULL; |
| } |
| |
| fe = (struct fileEntry *)buffer; |
| |
| if (fe->descTag.tagIdent != cpu_to_le16(TAG_IDENT_FE)) { |
| udf_debug("0x%x != TAG_IDENT_FE\n", |
| le16_to_cpu(fe->descTag.tagIdent)); |
| return NULL; |
| } |
| |
| ptr = (uint8_t *)(fe->extendedAttr) + |
| le32_to_cpu(fe->lengthExtendedAttr); |
| |
| if ((*offset > 0) && (*offset < le32_to_cpu(fe->lengthAllocDescs))) |
| ptr += *offset; |
| |
| ext = (extent_ad *)ptr; |
| |
| *offset = *offset + sizeof(extent_ad); |
| return ext; |
| } |
| #endif |
| |
| short_ad *udf_get_fileshortad(uint8_t *ptr, int maxoffset, uint32_t *offset, |
| int inc) |
| { |
| short_ad *sa; |
| |
| if ((!ptr) || (!offset)) { |
| printk(KERN_ERR "udf: udf_get_fileshortad() invalidparms\n"); |
| return NULL; |
| } |
| |
| if ((*offset + sizeof(short_ad)) > maxoffset) |
| return NULL; |
| else { |
| sa = (short_ad *)ptr; |
| if (sa->extLength == 0) |
| return NULL; |
| } |
| |
| if (inc) |
| *offset += sizeof(short_ad); |
| return sa; |
| } |
| |
| long_ad *udf_get_filelongad(uint8_t *ptr, int maxoffset, uint32_t *offset, int inc) |
| { |
| long_ad *la; |
| |
| if ((!ptr) || (!offset)) { |
| printk(KERN_ERR "udf: udf_get_filelongad() invalidparms\n"); |
| return NULL; |
| } |
| |
| if ((*offset + sizeof(long_ad)) > maxoffset) |
| return NULL; |
| else { |
| la = (long_ad *)ptr; |
| if (la->extLength == 0) |
| return NULL; |
| } |
| |
| if (inc) |
| *offset += sizeof(long_ad); |
| return la; |
| } |