static fsw_status_t fsw_ext2_dnode_fill(struct fsw_ext2_volume *vol, struct fsw_ext2_dnode *dno)
{
fsw_status_t status;
fsw_u32 groupno, ino_in_group, ino_bno, ino_index;
fsw_u8 *buffer;
if (dno->raw)
return FSW_SUCCESS;
FSW_MSG_DEBUG((FSW_MSGSTR("fsw_ext2_dnode_fill: inode %d\n"), dno->g.dnode_id));
// read the inode block
groupno = (fsw_u32) (dno->g.dnode_id - 1) / vol->sb->s_inodes_per_group;
ino_in_group = (fsw_u32) (dno->g.dnode_id - 1) % vol->sb->s_inodes_per_group;
ino_bno = vol->inotab_bno[groupno] +
ino_in_group / (vol->g.phys_blocksize / vol->inode_size);
ino_index = ino_in_group % (vol->g.phys_blocksize / vol->inode_size);
status = fsw_block_get(vol, ino_bno, 2, (void **)&buffer);
if (status)
return status;
// keep our inode around
status = fsw_memdup((void **)&dno->raw, buffer + ino_index * vol->inode_size, vol->inode_size);
fsw_block_release(vol, ino_bno, buffer);
if (status)
return status;
// get info from the inode
dno->g.size = dno->raw->i_size;
// TODO: check docs for 64-bit sized files
if (S_ISREG(dno->raw->i_mode))
dno->g.type = FSW_DNODE_TYPE_FILE;
else if (S_ISDIR(dno->raw->i_mode))
dno->g.type = FSW_DNODE_TYPE_DIR;
else if (S_ISLNK(dno->raw->i_mode))
dno->g.type = FSW_DNODE_TYPE_SYMLINK;
else
dno->g.type = FSW_DNODE_TYPE_SPECIAL;
return FSW_SUCCESS;
}
fsw_status_t fsw_shandle_read(struct fsw_shandle *shand, fsw_u32 *buffer_size_inout, void *buffer_in)
{
fsw_status_t status;
struct fsw_dnode *dno = shand->dnode;
struct fsw_volume *vol = dno->vol;
fsw_u8 *buffer, *block_buffer;
fsw_u32 buflen, copylen, pos;
fsw_u32 log_bno, pos_in_extent, phys_bno, pos_in_physblock;
fsw_u32 cache_level;
if (shand->pos >= dno->size) { // already at EOF
*buffer_size_inout = 0;
return FSW_SUCCESS;
}
// initialize vars
buffer = buffer_in;
buflen = *buffer_size_inout;
pos = (fsw_u32)shand->pos;
cache_level = (dno->type != FSW_DNODE_TYPE_FILE) ? 1 : 0;
// restrict read to file size
if (buflen > dno->size - pos)
buflen = (fsw_u32)(dno->size - pos);
while (buflen > 0) {
// get extent for the current logical block
log_bno = pos / vol->log_blocksize;
if (shand->extent.type == FSW_EXTENT_TYPE_INVALID ||
log_bno < shand->extent.log_start ||
log_bno >= shand->extent.log_start + shand->extent.log_count) {
if (shand->extent.type == FSW_EXTENT_TYPE_BUFFER)
fsw_free(shand->extent.buffer);
// ask the file system for the proper extent
shand->extent.log_start = log_bno;
status = vol->fstype_table->get_extent(vol, dno, &shand->extent);
if (status) {
shand->extent.type = FSW_EXTENT_TYPE_INVALID;
return status;
}
}
pos_in_extent = pos - shand->extent.log_start * vol->log_blocksize;
// dispatch by extent type
if (shand->extent.type == FSW_EXTENT_TYPE_PHYSBLOCK) {
// convert to physical block number and offset
phys_bno = shand->extent.phys_start + pos_in_extent / vol->phys_blocksize;
pos_in_physblock = pos_in_extent & (vol->phys_blocksize - 1);
copylen = vol->phys_blocksize - pos_in_physblock;
if (copylen > buflen)
copylen = buflen;
// get one physical block
status = fsw_block_get(vol, phys_bno, cache_level, (void **)&block_buffer);
if (status)
return status;
// copy data from it
fsw_memcpy(buffer, block_buffer + pos_in_physblock, copylen);
fsw_block_release(vol, phys_bno, block_buffer);
} else if (shand->extent.type == FSW_EXTENT_TYPE_BUFFER) {
copylen = shand->extent.log_count * vol->log_blocksize - pos_in_extent;
if (copylen > buflen)
copylen = buflen;
fsw_memcpy(buffer, (fsw_u8 *)shand->extent.buffer + pos_in_extent, copylen);
} else { // _SPARSE or _INVALID
copylen = shand->extent.log_count * vol->log_blocksize - pos_in_extent;
if (copylen > buflen)
copylen = buflen;
fsw_memzero(buffer, copylen);
}
buffer += copylen;
buflen -= copylen;
pos += copylen;
}
*buffer_size_inout = (fsw_u32)(pos - shand->pos);
shand->pos = pos;
return FSW_SUCCESS;
}
static fsw_status_t fsw_iso9660_volume_mount(struct fsw_iso9660_volume *vol)
{
fsw_status_t status;
void *buffer;
fsw_u32 blockno;
struct iso9660_volume_descriptor *voldesc;
struct iso9660_primary_volume_descriptor *pvoldesc;
fsw_u32 voldesc_type;
int i;
struct fsw_string s;
struct iso9660_dirrec rootdir;
int sua_pos;
char *sig;
int skip;
struct fsw_rock_ridge_susp_entry *entry;
// read through the Volume Descriptor Set
fsw_set_blocksize(vol, ISO9660_BLOCKSIZE, ISO9660_BLOCKSIZE);
blockno = ISO9660_SUPERBLOCK_BLOCKNO;
do {
status = fsw_block_get(vol, blockno, 0, &buffer);
if (status)
return status;
voldesc = (struct iso9660_volume_descriptor *)buffer;
voldesc_type = voldesc->volume_descriptor_type;
if (fsw_memeq(voldesc->standard_identifier, "CD001", 5)) {
// descriptor follows ISO 9660 standard
if (voldesc_type == 1 && voldesc->volume_descriptor_version == 1) {
// suitable Primary Volume Descriptor found
if (vol->primary_voldesc) {
fsw_free(vol->primary_voldesc);
vol->primary_voldesc = NULL;
}
status = fsw_memdup((void **)&vol->primary_voldesc, voldesc, ISO9660_BLOCKSIZE);
}
} else if (!fsw_memeq(voldesc->standard_identifier, "CD", 2)) {
// completely alien standard identifier, stop reading
voldesc_type = 255;
}
fsw_block_release(vol, blockno, buffer);
blockno++;
} while (!status && voldesc_type != 255);
if (status)
return status;
// get information from Primary Volume Descriptor
if (vol->primary_voldesc == NULL)
return FSW_UNSUPPORTED;
pvoldesc = vol->primary_voldesc;
if (ISOINT(pvoldesc->logical_block_size) != 2048)
return FSW_UNSUPPORTED;
// get volume name
for (i = 32; i > 0; i--)
if (pvoldesc->volume_identifier[i-1] != ' ')
break;
s.type = FSW_STRING_TYPE_ISO88591;
s.size = s.len = i;
s.data = pvoldesc->volume_identifier;
status = fsw_strdup_coerce(&vol->g.label, vol->g.host_string_type, &s);
if (status)
return status;
// setup the root dnode
status = fsw_dnode_create_root(vol, ISO9660_SUPERBLOCK_BLOCKNO << ISO9660_BLOCKSIZE_BITS, &vol->g.root);
if (status)
return status;
fsw_memcpy(&vol->g.root->dirrec, &pvoldesc->root_directory, sizeof(struct iso9660_dirrec));
if ( pvoldesc->escape[0] == 0x25
&& pvoldesc->escape[1] == 0x2f
&& ( pvoldesc->escape[2] == 0x40
|| pvoldesc->escape[2] == 0x43
|| pvoldesc->escape[2] == 0x45))
{
FSW_MSG_DEBUG((FSW_MSGSTR("fsw_iso9660_volume_mount: success (joliet!!!)\n")));
vol->fJoliet = 1;
}
fsw_memcpy(&rootdir, &pvoldesc->root_directory, sizeof(rootdir));
sua_pos = (sizeof(struct iso9660_dirrec)) + rootdir.file_identifier_length + (rootdir.file_identifier_length % 2) - 2;
//int sua_size = rootdir.dirrec_length - rootdir.file_identifier_length;
//FSW_MSG_DEBUG((FSW_MSGSTR("fsw_iso9660_volume_mount: success (SUA(pos:%x, sz:%d)!!!)\n"), sua_pos, sua_size));
#if 1
status = fsw_block_get(vol, ISOINT(rootdir.extent_location), 0, &buffer);
sig = (char *)buffer + sua_pos;
skip = 0;
entry = (struct fsw_rock_ridge_susp_entry *)sig;
if ( entry->sig[0] == 'S'
&& entry->sig[1] == 'P')
{
struct fsw_rock_ridge_susp_sp *sp = (struct fsw_rock_ridge_susp_sp *)entry;
if (sp->magic[0] == 0xbe && sp->magic[1] == 0xef)
{
vol->fRockRidge = 1;
} else {
FSW_MSG_DEBUG((FSW_MSGSTR("fsw_iso9660_volume_mount: SP magic isn't valid\n")));
}
skip = sp->skip;
}
#endif
// release volume descriptors
fsw_free(vol->primary_voldesc);
vol->primary_voldesc = NULL;
FSW_MSG_DEBUG((FSW_MSGSTR("fsw_iso9660_volume_mount: success\n")));
return FSW_SUCCESS;
}
static fsw_status_t fsw_ext2_volume_mount(struct fsw_ext2_volume *vol)
{
fsw_status_t status;
void *buffer;
fsw_u32 blocksize;
fsw_u32 groupcnt, groupno, gdesc_per_block, gdesc_bno, gdesc_index;
struct ext2_group_desc *gdesc;
int i;
struct fsw_string s;
// allocate memory to keep the superblock around
status = fsw_alloc(sizeof(struct ext2_super_block), &vol->sb);
if (status)
return status;
// read the superblock into its buffer
fsw_set_blocksize(vol, EXT2_SUPERBLOCK_BLOCKSIZE, EXT2_SUPERBLOCK_BLOCKSIZE);
status = fsw_block_get(vol, EXT2_SUPERBLOCK_BLOCKNO, 0, &buffer);
if (status)
return status;
fsw_memcpy(vol->sb, buffer, sizeof(struct ext2_super_block));
fsw_block_release(vol, EXT2_SUPERBLOCK_BLOCKNO, buffer);
// check the superblock
if (vol->sb->s_magic != EXT2_SUPER_MAGIC)
return FSW_UNSUPPORTED;
if (vol->sb->s_rev_level != EXT2_GOOD_OLD_REV &&
vol->sb->s_rev_level != EXT2_DYNAMIC_REV)
return FSW_UNSUPPORTED;
if (vol->sb->s_rev_level == EXT2_DYNAMIC_REV &&
(vol->sb->s_feature_incompat & ~(EXT2_FEATURE_INCOMPAT_FILETYPE | EXT3_FEATURE_INCOMPAT_RECOVER)))
return FSW_UNSUPPORTED;
/*
if (vol->sb->s_rev_level == EXT2_DYNAMIC_REV &&
(vol->sb->s_feature_incompat & EXT3_FEATURE_INCOMPAT_RECOVER))
Print(L"Ext2 WARNING: This ext3 file system needs recovery, trying to use it anyway.\n");
*/
// set real blocksize
blocksize = EXT2_BLOCK_SIZE(vol->sb);
fsw_set_blocksize(vol, blocksize, blocksize);
// get other info from superblock
vol->ind_bcnt = EXT2_ADDR_PER_BLOCK(vol->sb);
vol->dind_bcnt = vol->ind_bcnt * vol->ind_bcnt;
vol->inode_size = EXT2_INODE_SIZE(vol->sb);
for (i = 0; i < 16; i++)
if (vol->sb->s_volume_name[i] == 0)
break;
s.type = FSW_STRING_TYPE_ISO88591;
s.size = s.len = i;
s.data = vol->sb->s_volume_name;
status = fsw_strdup_coerce(&vol->g.label, vol->g.host_string_type, &s);
if (status)
return status;
// read the group descriptors to get inode table offsets
groupcnt = ((vol->sb->s_inodes_count - 2) / vol->sb->s_inodes_per_group) + 1;
gdesc_per_block = (vol->g.phys_blocksize / sizeof(struct ext2_group_desc));
status = fsw_alloc(sizeof(fsw_u32) * groupcnt, &vol->inotab_bno);
if (status)
return status;
for (groupno = 0; groupno < groupcnt; groupno++) {
// get the block group descriptor
gdesc_bno = (vol->sb->s_first_data_block + 1) + groupno / gdesc_per_block;
gdesc_index = groupno % gdesc_per_block;
status = fsw_block_get(vol, gdesc_bno, 1, (void **)&buffer);
if (status)
return status;
gdesc = ((struct ext2_group_desc *)(buffer)) + gdesc_index;
vol->inotab_bno[groupno] = gdesc->bg_inode_table;
fsw_block_release(vol, gdesc_bno, buffer);
}
// setup the root dnode
status = fsw_dnode_create_root(vol, EXT2_ROOT_INO, &vol->g.root);
if (status)
return status;
FSW_MSG_DEBUG((FSW_MSGSTR("fsw_ext2_volume_mount: success, blocksize %d\n"), blocksize));
return FSW_SUCCESS;
}
static fsw_status_t fsw_ext2_get_extent(struct fsw_ext2_volume *vol, struct fsw_ext2_dnode *dno,
struct fsw_extent *extent)
{
fsw_status_t status;
fsw_u32 bno, release_bno, buf_bcnt, file_bcnt;
fsw_u32 *buffer;
int path[5], i;
// Preconditions: The caller has checked that the requested logical block
// is within the file's size. The dnode has complete information, i.e.
// fsw_ext2_dnode_read_info was called successfully on it.
extent->type = FSW_EXTENT_TYPE_PHYSBLOCK;
extent->log_count = 1;
bno = extent->log_start;
// try direct block pointers in the inode
if (bno < EXT2_NDIR_BLOCKS) {
path[0] = bno;
path[1] = -1;
} else {
bno -= EXT2_NDIR_BLOCKS;
// try indirect block
if (bno < vol->ind_bcnt) {
path[0] = EXT2_IND_BLOCK;
path[1] = bno;
path[2] = -1;
} else {
bno -= vol->ind_bcnt;
// try double-indirect block
if (bno < vol->dind_bcnt) {
path[0] = EXT2_DIND_BLOCK;
path[1] = bno / vol->ind_bcnt;
path[2] = bno % vol->ind_bcnt;
path[3] = -1;
} else {
bno -= vol->dind_bcnt;
// use the triple-indirect block
path[0] = EXT2_TIND_BLOCK;
path[1] = bno / vol->dind_bcnt;
path[2] = (bno / vol->ind_bcnt) % vol->ind_bcnt;
path[3] = bno % vol->ind_bcnt;
path[4] = -1;
}
}
}
// follow the indirection path
buffer = dno->raw->i_block;
buf_bcnt = EXT2_NDIR_BLOCKS;
release_bno = 0;
for (i = 0; ; i++) {
bno = buffer[path[i]];
if (bno == 0) {
extent->type = FSW_EXTENT_TYPE_SPARSE;
if (release_bno)
fsw_block_release(vol, release_bno, buffer);
return FSW_SUCCESS;
}
if (path[i+1] < 0)
break;
if (release_bno)
fsw_block_release(vol, release_bno, buffer);
status = fsw_block_get(vol, bno, 1, (void **)&buffer);
if (status)
return status;
release_bno = bno;
buf_bcnt = vol->ind_bcnt;
}
extent->phys_start = bno;
// check if the following blocks can be aggregated into one extent
file_bcnt = (fsw_u32)((dno->g.size + vol->g.log_blocksize - 1) & (vol->g.log_blocksize - 1));
while (path[i] + extent->log_count < buf_bcnt && // indirect block has more block pointers
extent->log_start + extent->log_count < file_bcnt) { // file has more blocks
if (buffer[path[i] + extent->log_count] == buffer[path[i] + extent->log_count - 1] + 1)
extent->log_count++;
else
break;
}
if (release_bno)
fsw_block_release(vol, release_bno, buffer);
return FSW_SUCCESS;
}
