/* * 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; 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\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; }