diff options
Diffstat (limited to 'fs/udf/directory.c')
| -rw-r--r-- | fs/udf/directory.c | 343 |
1 files changed, 343 insertions, 0 deletions
diff --git a/fs/udf/directory.c b/fs/udf/directory.c new file mode 100644 index 0000000..9a61ecc --- /dev/null +++ b/fs/udf/directory.c @@ -0,0 +1,343 @@ +/* + * directory.c + * + * PURPOSE + * Directory related functions + * + * CONTACTS + * E-mail regarding any portion of the Linux UDF file system should be + * directed to the development team mailing list (run by majordomo): + * linux_udf@hpesjro.fc.hp.com + * + * 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) + { + udf_release_data(*bh); + *error = 1; + return NULL; + } + + if (*offset == dir->i_sb->s_blocksize) + { + udf_release_data(*bh); + block = udf_get_lb_pblock(dir->i_sb, fe_loc, ++*pos); + if (!block) + return NULL; + if (!(*bh = udf_tread(dir->i_sb, block))) + 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); + + udf_release_data(*bh); + block = udf_get_lb_pblock(dir->i_sb, fe_loc, ++*pos); + if (!block) + return NULL; + if (!((*bh) = udf_tread(dir->i_sb, block))) + 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, + kernel_lb_addr *bloc, uint32_t *extoffset, + kernel_lb_addr *eloc, uint32_t *elen, + uint32_t *offset, struct buffer_head **bh) +{ + struct fileIdentDesc *fi; + int i, num, block; + struct buffer_head * tmp, * bha[16]; + + fibh->soffset = fibh->eoffset; + + if (UDF_I_ALLOCTYPE(dir) == ICBTAG_FLAG_AD_IN_ICB) + { + fi = udf_get_fileident(UDF_I_DATA(dir) - + (UDF_I_EFE(dir) ? + 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 = *extoffset; + + if (udf_next_aext(dir, bloc, extoffset, eloc, elen, bh, 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 + *extoffset = lextoffset; + + udf_release_data(fibh->sbh); + if (!(fibh->sbh = fibh->ebh = udf_tread(dir->i_sb, block))) + return NULL; + fibh->soffset = fibh->eoffset = 0; + + if (!(*offset & ((16 >> (dir->i_sb->s_blocksize_bits - 9))-1))) + { + i = 16 >> (dir->i_sb->s_blocksize_bits - 9); + if (i+*offset > (*elen >> dir->i_sb->s_blocksize_bits)) + i = (*elen >> dir->i_sb->s_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) + { + udf_release_data(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 = *extoffset; + + if (udf_next_aext(dir, bloc, extoffset, eloc, elen, bh, 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 + *extoffset = lextoffset; + + fibh->soffset -= dir->i_sb->s_blocksize; + fibh->eoffset -= dir->i_sb->s_blocksize; + + if (!(fibh->ebh = udf_tread(dir->i_sb, block))) + 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 (le16_to_cpu(fi->descTag.tagIdent) != 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 ( le16_to_cpu(fe->descTag.tagIdent) != 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, int *offset, int inc) +{ + short_ad *sa; + + if ( (!ptr) || (!offset) ) + { + printk(KERN_ERR "udf: udf_get_fileshortad() invalidparms\n"); + return NULL; + } + + if ( (*offset < 0) || ((*offset + sizeof(short_ad)) > maxoffset) ) + return NULL; + else if ((sa = (short_ad *)ptr)->extLength == 0) + return NULL; + + if (inc) + *offset += sizeof(short_ad); + return sa; +} + +long_ad * +udf_get_filelongad(uint8_t *ptr, int maxoffset, int * offset, int inc) +{ + long_ad *la; + + if ( (!ptr) || (!offset) ) + { + printk(KERN_ERR "udf: udf_get_filelongad() invalidparms\n"); + return NULL; + } + + if ( (*offset < 0) || ((*offset + sizeof(long_ad)) > maxoffset) ) + return NULL; + else if ((la = (long_ad *)ptr)->extLength == 0) + return NULL; + + if (inc) + *offset += sizeof(long_ad); + return la; +} |
