Uint8 * udf_filead_read(struct inode *dir, Uint8 *tmpad, Uint8 ad_size,
lb_addr fe_loc, int *pos, int *offset, struct buffer_head **bh, int *error)
{
int loffset = *offset;
int block;
Uint8 *ad;
int remainder;
*error = 0;
ad = (Uint8 *)(*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, dir->i_sb->s_blocksize)))
return NULL;
}
else if (*offset > dir->i_sb->s_blocksize)
{
ad = tmpad;
remainder = dir->i_sb->s_blocksize - loffset;
memcpy((Uint8 *)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, dir->i_sb->s_blocksize)))
return NULL;
memcpy((Uint8 *)ad + remainder, (*bh)->b_data, ad_size - remainder);
*offset = ad_size - remainder;
}
return ad;
}
uint32_t udf_get_pblock_virt15(struct super_block *sb, uint32_t block, uint16_t partition, uint32_t offset)
{
struct buffer_head *bh = NULL;
uint32_t newblock;
uint32_t index;
uint32_t loc;
index = (sb->s_blocksize - UDF_SB_TYPEVIRT(sb,partition).s_start_offset) / sizeof(uint32_t);
if (block > UDF_SB_TYPEVIRT(sb,partition).s_num_entries)
{
udf_debug("Trying to access block beyond end of VAT (%d max %d)\n",
block, UDF_SB_TYPEVIRT(sb,partition).s_num_entries);
return 0xFFFFFFFF;
}
if (block >= index)
{
block -= index;
newblock = 1 + (block / (sb->s_blocksize / sizeof(uint32_t)));
index = block % (sb->s_blocksize / sizeof(uint32_t));
}
else
{
newblock = 0;
index = UDF_SB_TYPEVIRT(sb,partition).s_start_offset / sizeof(uint32_t) + block;
}
loc = udf_block_map(UDF_SB_VAT(sb), newblock, NULL);
if (!(bh = sb_bread(sb, loc)))
{
udf_debug("get_pblock(UDF_VIRTUAL_MAP:%p,%d,%d) VAT: %d[%d]\n",
sb, block, partition, loc, index);
return 0xFFFFFFFF;
}
loc = le32_to_cpu(((__le32 *)bh->b_data)[index]);
udf_release_data(bh);
if (UDF_I_LOCATION(UDF_SB_VAT(sb)).partitionReferenceNum == partition)
{
udf_debug("recursive call to udf_get_pblock!\n");
return 0xFFFFFFFF;
}
return udf_get_pblock(sb, loc, UDF_I_LOCATION(UDF_SB_VAT(sb)).partitionReferenceNum, offset);
}
static int udf_symlink_filler(struct file *file, struct page *page)
{
struct inode *inode = page->mapping->host;
struct buffer_head *bh = NULL;
char *symlink;
int err = -EIO;
char *p = kmap(page);
lock_kernel();
if (UDF_I_ALLOCTYPE(inode) == ICB_FLAG_AD_IN_ICB)
{
bh = udf_tread(inode->i_sb, inode->i_ino);
if (!bh)
goto out;
symlink = bh->b_data + udf_file_entry_alloc_offset(inode);
}
else
{
bh = sb_bread(inode->i_sb, udf_block_map(inode, 0));
if (!bh)
goto out;
symlink = bh->b_data;
}
udf_pc_to_char(symlink, inode->i_size, p);
udf_release_data(bh);
unlock_kernel();
SetPageUptodate(page);
kunmap(page);
UnlockPage(page);
return 0;
out:
unlock_kernel();
SetPageError(page);
kunmap(page);
UnlockPage(page);
return err;
}
void udf_fill_spartable(struct super_block *sb, struct udf_sparing_data *sdata, int partlen)
{
Uint16 ident;
Uint32 spartable;
int i;
struct buffer_head *bh;
struct SparingTable *st;
for (i=0; i<4; i++)
{
if (!(spartable = sdata->s_spar_loc[i]))
continue;
bh = udf_read_tagged(sb, spartable, spartable, &ident);
if (!bh)
{
sdata->s_spar_loc[i] = 0;
continue;
}
if (ident == 0)
{
st = (struct SparingTable *)bh->b_data;
if (!strncmp(st->sparingIdent.ident, UDF_ID_SPARING, strlen(UDF_ID_SPARING)))
{
SparingEntry *se;
Uint16 rtl = le16_to_cpu(st->reallocationTableLen);
int index;
if (!sdata->s_spar_map)
{
int num = 1, mapsize;
sdata->s_spar_indexsize = 8;
while (rtl*sizeof(Uint32) >= (1 << sdata->s_spar_indexsize))
{
num ++;
sdata->s_spar_indexsize <<= 1;
}
mapsize = (rtl * sizeof(Uint32)) +
((partlen/(1 << sdata->s_spar_pshift)) * sizeof(Uint8) * num);
sdata->s_spar_map = kmalloc(mapsize, GFP_KERNEL);
sdata->s_spar_remap.s_spar_remap32 = &sdata->s_spar_map[rtl];
memset(sdata->s_spar_map, 0xFF, mapsize);
}
index = sizeof(struct SparingTable);
for (i=0; i<rtl; i++)
{
if (index > sb->s_blocksize)
{
udf_release_data(bh);
bh = udf_tread(sb, ++spartable, sb->s_blocksize);
if (!bh)
{
sdata->s_spar_loc[i] = 0;
continue;
}
index = 0;
}
se = (SparingEntry *)&(bh->b_data[index]);
index += sizeof(SparingEntry);
if (sdata->s_spar_map[i] == 0xFFFFFFFF)
sdata->s_spar_map[i] = le32_to_cpu(se->mappedLocation);
else if (sdata->s_spar_map[i] != le32_to_cpu(se->mappedLocation))
{
udf_debug("Found conflicting Sparing Data (%d vs %d for entry %d)\n",
sdata->s_spar_map[i], le32_to_cpu(se->mappedLocation), i);
}
if (le32_to_cpu(se->origLocation) < 0xFFFFFFF0)
{
int packet = le32_to_cpu(se->origLocation) >> sdata->s_spar_pshift;
if (sdata->s_spar_indexsize == 8)
{
if (sdata->s_spar_remap.s_spar_remap8[packet] == 0xFF)
sdata->s_spar_remap.s_spar_remap8[packet] = i;
else if (sdata->s_spar_remap.s_spar_remap8[packet] != i)
{
udf_debug("Found conflicting Sparing Data (%d vs %d)\n",
sdata->s_spar_remap.s_spar_remap8[packet], i);
}
}
else if (sdata->s_spar_indexsize == 16)
{
if (sdata->s_spar_remap.s_spar_remap16[packet] == 0xFFFF)
sdata->s_spar_remap.s_spar_remap16[packet] = i;
else if (sdata->s_spar_remap.s_spar_remap16[packet] != i)
{
udf_debug("Found conflicting Sparing Data (%d vs %d)\n",
sdata->s_spar_remap.s_spar_remap16[packet], i);
}
}
else if (sdata->s_spar_indexsize == 32)
{
if (sdata->s_spar_remap.s_spar_remap32[packet] == 0xFFFFFFFF)
sdata->s_spar_remap.s_spar_remap32[packet] = i;
else if (sdata->s_spar_remap.s_spar_remap32[packet] != i)
{
udf_debug("Found conflicting Sparing Data (%d vs %d)\n",
sdata->s_spar_remap.s_spar_remap32[packet], i);
}
}
}
}
}
static int
udf_find_fileset(struct super_block *sb, lb_addr *fileset, lb_addr *root)
{
struct buffer_head *bh = NULL;
long lastblock;
Uint16 ident;
if (fileset->logicalBlockNum != 0xFFFFFFFF ||
fileset->partitionReferenceNum != 0xFFFF)
{
bh = udf_read_ptagged(sb, *fileset, 0, &ident);
if (!bh)
return 1;
else if (ident != TID_FILE_SET_DESC)
{
udf_release_data(bh);
return 1;
}
}
if (!bh) /* Search backwards through the partitions */
{
lb_addr newfileset;
return 1;
for (newfileset.partitionReferenceNum=UDF_SB_NUMPARTS(sb)-1;
(newfileset.partitionReferenceNum != 0xFFFF &&
fileset->logicalBlockNum == 0xFFFFFFFF &&
fileset->partitionReferenceNum == 0xFFFF);
newfileset.partitionReferenceNum--)
{
lastblock = UDF_SB_PARTLEN(sb, newfileset.partitionReferenceNum);
newfileset.logicalBlockNum = 0;
do
{
bh = udf_read_ptagged(sb, newfileset, 0, &ident);
if (!bh)
{
newfileset.logicalBlockNum ++;
continue;
}
switch (ident)
{
case TID_SPACE_BITMAP_DESC:
{
struct SpaceBitmapDesc *sp;
sp = (struct SpaceBitmapDesc *)bh->b_data;
newfileset.logicalBlockNum += 1 +
((le32_to_cpu(sp->numOfBytes) + sizeof(struct SpaceBitmapDesc) - 1)
>> sb->s_blocksize_bits);
udf_release_data(bh);
break;
}
case TID_FILE_SET_DESC:
{
*fileset = newfileset;
break;
}
default:
{
newfileset.logicalBlockNum ++;
udf_release_data(bh);
bh = NULL;
break;
}
}
}
while (newfileset.logicalBlockNum < lastblock &&
fileset->logicalBlockNum == 0xFFFFFFFF &&
fileset->partitionReferenceNum == 0xFFFF);
}
}
/*
* udf_find_anchor
*
* PURPOSE
* Find an anchor volume descriptor.
*
* PRE-CONDITIONS
* sb Pointer to _locked_ superblock.
* lastblock Last block on media.
*
* POST-CONDITIONS
* <return> 1 if not found, 0 if ok
*
* HISTORY
* July 1, 1997 - Andrew E. Mileski
* Written, tested, and released.
*/
static void
udf_find_anchor(struct super_block *sb)
{
int lastblock = UDF_SB_LASTBLOCK(sb);
struct buffer_head *bh = NULL;
Uint16 ident;
Uint32 location;
int i;
if (lastblock)
{
int varlastblock = udf_variable_to_fixed(lastblock);
int last[] = { lastblock, lastblock - 2,
lastblock - 150, lastblock - 152,
varlastblock, varlastblock - 2,
varlastblock - 150, varlastblock - 152 };
lastblock = 0;
/* Search for an anchor volume descriptor pointer */
/* according to spec, anchor is in either:
* block 256
* lastblock-256
* lastblock
* however, if the disc isn't closed, it could be 512 */
for (i=0; (!lastblock && i<sizeof(last)/sizeof(int)); i++)
{
if (last[i] < 0 || !(bh = sb_bread(sb, last[i])))
{
ident = location = 0;
}
else
{
ident = le16_to_cpu(((tag *)bh->b_data)->tagIdent);
location = le32_to_cpu(((tag *)bh->b_data)->tagLocation);
udf_release_data(bh);
}
if (ident == TID_ANCHOR_VOL_DESC_PTR)
{
if (location == last[i] - UDF_SB_SESSION(sb))
{
lastblock = UDF_SB_ANCHOR(sb)[0] = last[i];
UDF_SB_ANCHOR(sb)[1] = last[i] - 256;
}
else if (location == udf_variable_to_fixed(last[i]) - UDF_SB_SESSION(sb))
{
UDF_SET_FLAG(sb, UDF_FLAG_VARCONV);
lastblock = UDF_SB_ANCHOR(sb)[0] = udf_variable_to_fixed(last[i]);
UDF_SB_ANCHOR(sb)[1] = lastblock - 256;
}
else
udf_debug("Anchor found at block %d, location mismatch %d.\n",
last[i], location);
}
else if (ident == TID_FILE_ENTRY || ident == TID_EXTENDED_FILE_ENTRY)
{
lastblock = last[i];
UDF_SB_ANCHOR(sb)[3] = 512 + UDF_SB_SESSION(sb);
}
else
{
if (last[i] < 256 || !(bh = sb_bread(sb, last[i] - 256)))
{
ident = location = 0;
}
else
{
ident = le16_to_cpu(((tag *)bh->b_data)->tagIdent);
location = le32_to_cpu(((tag *)bh->b_data)->tagLocation);
udf_release_data(bh);
}
if (ident == TID_ANCHOR_VOL_DESC_PTR &&
location == last[i] - 256 - UDF_SB_SESSION(sb))
{
lastblock = last[i];
UDF_SB_ANCHOR(sb)[1] = last[i] - 256;
}
else
{
if (last[i] < 312 + UDF_SB_SESSION(sb) || !(bh = sb_bread(sb, last[i] - 312 - UDF_SB_SESSION(sb))))
{
ident = location = 0;
}
else
{
ident = le16_to_cpu(((tag *)bh->b_data)->tagIdent);
location = le32_to_cpu(((tag *)bh->b_data)->tagLocation);
udf_release_data(bh);
}
if (ident == TID_ANCHOR_VOL_DESC_PTR &&
location == udf_variable_to_fixed(last[i]) - 256)
{
UDF_SET_FLAG(sb, UDF_FLAG_VARCONV);
lastblock = udf_variable_to_fixed(last[i]);
UDF_SB_ANCHOR(sb)[1] = lastblock - 256;
}
}
}
}
}
if (!lastblock)
{
/* We havn't found the lastblock. check 312 */
if ((bh = sb_bread(sb, 312 + UDF_SB_SESSION(sb))))
{
ident = le16_to_cpu(((tag *)bh->b_data)->tagIdent);
location = le32_to_cpu(((tag *)bh->b_data)->tagLocation);
udf_release_data(bh);
if (ident == TID_ANCHOR_VOL_DESC_PTR && location == 256)
UDF_SET_FLAG(sb, UDF_FLAG_VARCONV);
}
}
for (i=0; i<sizeof(UDF_SB_ANCHOR(sb))/sizeof(int); i++)
{
if (UDF_SB_ANCHOR(sb)[i])
{
if (!(bh = udf_read_tagged(sb,
UDF_SB_ANCHOR(sb)[i], UDF_SB_ANCHOR(sb)[i], &ident)))
{
UDF_SB_ANCHOR(sb)[i] = 0;
}
else
{
udf_release_data(bh);
if ((ident != TID_ANCHOR_VOL_DESC_PTR) && (i ||
(ident != TID_FILE_ENTRY && ident != TID_EXTENDED_FILE_ENTRY)))
{
UDF_SB_ANCHOR(sb)[i] = 0;
}
}
}
}
UDF_SB_LASTBLOCK(sb) = lastblock;
}
static int
udf_vrs(struct super_block *sb, int silent)
{
struct VolStructDesc *vsd = NULL;
int sector = 32768;
int sectorsize;
struct buffer_head *bh = NULL;
int iso9660=0;
int nsr02=0;
int nsr03=0;
/* Block size must be a multiple of 512 */
if (sb->s_blocksize & 511)
return 0;
if (sb->s_blocksize < sizeof(struct VolStructDesc))
sectorsize = sizeof(struct VolStructDesc);
else
sectorsize = sb->s_blocksize;
sector += (UDF_SB_SESSION(sb) << sb->s_blocksize_bits);
udf_debug("Starting at sector %u (%ld byte sectors)\n",
(sector >> sb->s_blocksize_bits), sb->s_blocksize);
/* Process the sequence (if applicable) */
for (;!nsr02 && !nsr03; sector += sectorsize)
{
/* Read a block */
bh = udf_tread(sb, sector >> sb->s_blocksize_bits);
if (!bh)
break;
/* Look for ISO descriptors */
vsd = (struct VolStructDesc *)(bh->b_data +
(sector & (sb->s_blocksize - 1)));
if (vsd->stdIdent[0] == 0)
{
udf_release_data(bh);
break;
}
else if (!strncmp(vsd->stdIdent, STD_ID_CD001, STD_ID_LEN))
{
iso9660 = sector;
switch (vsd->structType)
{
case 0:
udf_debug("ISO9660 Boot Record found\n");
break;
case 1:
udf_debug("ISO9660 Primary Volume Descriptor found\n");
break;
case 2:
udf_debug("ISO9660 Supplementary Volume Descriptor found\n");
break;
case 3:
udf_debug("ISO9660 Volume Partition Descriptor found\n");
break;
case 255:
udf_debug("ISO9660 Volume Descriptor Set Terminator found\n");
break;
default:
udf_debug("ISO9660 VRS (%u) found\n", vsd->structType);
break;
}
}
else if (!strncmp(vsd->stdIdent, STD_ID_BEA01, STD_ID_LEN))
{
}
else if (!strncmp(vsd->stdIdent, STD_ID_TEA01, STD_ID_LEN))
{
udf_release_data(bh);
break;
}
else if (!strncmp(vsd->stdIdent, STD_ID_NSR02, STD_ID_LEN))
{
nsr02 = sector;
}
else if (!strncmp(vsd->stdIdent, STD_ID_NSR03, STD_ID_LEN))
{
nsr03 = sector;
}
udf_release_data(bh);
}
if (nsr03)
return nsr03;
else if (nsr02)
return nsr02;
else if (sector - (UDF_SB_SESSION(sb) << sb->s_blocksize_bits) == 32768)
return -1;
else
return 0;
}
struct FileIdentDesc *
udf_fileident_read(struct inode *dir, loff_t *nf_pos,
struct udf_fileident_bh *fibh,
struct FileIdentDesc *cfi,
lb_addr *bloc, Uint32 *extoffset,
lb_addr *eloc, Uint32 *elen,
Uint32 *offset, struct buffer_head **bh)
{
struct FileIdentDesc *fi;
int block;
fibh->soffset = fibh->eoffset;
if (fibh->eoffset == dir->i_sb->s_blocksize)
{
int lextoffset = *extoffset;
if (udf_next_aext(dir, bloc, extoffset, eloc, elen, bh, 1) !=
EXTENT_RECORDED_ALLOCATED)
{
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, dir->i_sb->s_blocksize)))
return NULL;
fibh->soffset = fibh->eoffset = 0;
}
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 *)cfi, (Uint8 *)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) !=
EXTENT_RECORDED_ALLOCATED)
{
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, dir->i_sb->s_blocksize)))
return NULL;
if (sizeof(struct FileIdentDesc) > - fibh->soffset)
{
int fi_len;
memcpy((Uint8 *)cfi, (Uint8 *)fi, - fibh->soffset);
memcpy((Uint8 *)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;
}
