static struct grub_archelp_data *
grub_cbfs_mount (grub_disk_t disk)
{
struct cbfs_file hd;
struct grub_archelp_data *data = NULL;
grub_uint32_t ptr;
grub_off_t header_off;
struct cbfs_header head;
if (grub_disk_get_size (disk) == GRUB_DISK_SIZE_UNKNOWN)
goto fail;
if (grub_disk_read (disk, grub_disk_get_size (disk) - 1,
GRUB_DISK_SECTOR_SIZE - sizeof (ptr),
sizeof (ptr), &ptr))
goto fail;
ptr = grub_cpu_to_le32 (ptr);
header_off = (grub_disk_get_size (disk) << GRUB_DISK_SECTOR_BITS)
+ (grub_int32_t) ptr;
if (grub_disk_read (disk, 0, header_off,
sizeof (head), &head))
goto fail;
if (!validate_head (&head))
goto fail;
data = (struct grub_archelp_data *) grub_zalloc (sizeof (*data));
if (!data)
goto fail;
data->cbfs_start = (grub_disk_get_size (disk) << GRUB_DISK_SECTOR_BITS)
- (grub_be_to_cpu32 (head.romsize) - grub_be_to_cpu32 (head.offset));
data->cbfs_end = (grub_disk_get_size (disk) << GRUB_DISK_SECTOR_BITS)
- grub_be_to_cpu32 (head.bootblocksize);
data->cbfs_align = grub_be_to_cpu32 (head.align);
if (data->cbfs_start >= (grub_disk_get_size (disk) << GRUB_DISK_SECTOR_BITS))
goto fail;
if (data->cbfs_end > (grub_disk_get_size (disk) << GRUB_DISK_SECTOR_BITS))
data->cbfs_end = (grub_disk_get_size (disk) << GRUB_DISK_SECTOR_BITS);
data->next_hofs = data->cbfs_start;
if (grub_disk_read (disk, 0, data->cbfs_start, sizeof (hd), &hd))
goto fail;
if (grub_memcmp (hd.magic, CBFS_FILE_MAGIC, sizeof (CBFS_FILE_MAGIC) - 1))
goto fail;
data->disk = disk;
return data;
fail:
grub_free (data);
grub_error (GRUB_ERR_BAD_FS, "not a cbfs filesystem");
return 0;
}
static grub_disk_addr_t
grub_affs_read_block (grub_fshelp_node_t node, grub_disk_addr_t fileblock)
{
int links;
grub_uint32_t pos;
int block = node->block;
struct grub_affs_file file;
struct grub_affs_data *data = node->data;
grub_uint32_t mod;
/* Find the block that points to the fileblock we are looking up by
following the chain until the right table is reached. */
for (links = grub_divmod64 (fileblock, data->htsize, &mod); links; links--)
{
grub_disk_read (data->disk, block + data->blocksize - 1,
data->blocksize * (GRUB_DISK_SECTOR_SIZE
- GRUB_AFFS_FILE_LOCATION),
sizeof (file), &file);
if (grub_errno)
return 0;
block = grub_be_to_cpu32 (file.extension);
}
/* Translate the fileblock to the block within the right table. */
fileblock = mod;
grub_disk_read (data->disk, block,
GRUB_AFFS_BLOCKPTR_OFFSET
+ (data->htsize - fileblock - 1) * sizeof (pos),
sizeof (pos), &pos);
if (grub_errno)
return 0;
return grub_be_to_cpu32 (pos);
}
static struct grub_sfs_data *
grub_sfs_mount (grub_disk_t disk)
{
struct grub_sfs_data *data;
struct grub_sfs_objc *rootobjc;
char *rootobjc_data = 0;
unsigned int blk;
data = grub_malloc (sizeof (*data));
if (!data)
return 0;
/* Read the rootblock. */
grub_disk_read (disk, 0, 0, sizeof (struct grub_sfs_rblock),
(char *) &data->rblock);
if (grub_errno)
goto fail;
/* Make sure this is a sfs filesystem. */
if (grub_strncmp ((char *) (data->rblock.header.magic), "SFS", 4))
{
grub_error (GRUB_ERR_BAD_FS, "not a sfs filesystem");
goto fail;
}
data->blocksize = grub_be_to_cpu32 (data->rblock.blocksize);
rootobjc_data = grub_malloc (data->blocksize);
if (! rootobjc_data)
goto fail;
/* Read the root object container. */
grub_disk_read (disk, grub_be_to_cpu32 (data->rblock.rootobject), 0,
data->blocksize, rootobjc_data);
if (grub_errno)
goto fail;
rootobjc = (struct grub_sfs_objc *) rootobjc_data;
blk = grub_be_to_cpu32 (rootobjc->objects[0].file_dir.dir.dir_objc);
data->diropen.size = 0;
data->diropen.block = blk;
data->diropen.data = data;
data->disk = disk;
data->label = grub_strdup ((char *) (rootobjc->objects[0].filename));
return data;
fail:
if (grub_errno == GRUB_ERR_OUT_OF_RANGE)
grub_error (GRUB_ERR_BAD_FS, "not an sfs filesystem");
grub_free (data);
grub_free (rootobjc_data);
return 0;
}
static grub_err_t
grub_cpio_find_file (struct grub_archelp_data *data, char **name,
grub_int32_t *mtime, grub_uint32_t *mode)
{
struct head hd;
grub_size_t namesize;
grub_uint32_t modeval;
data->hofs = data->next_hofs;
if (grub_disk_read (data->disk, 0, data->hofs, sizeof (hd), &hd))
return grub_errno;
if (grub_memcmp (hd.magic, MAGIC, sizeof (hd.magic)) != 0
#ifdef MAGIC2
&& grub_memcmp (hd.magic, MAGIC2, sizeof (hd.magic)) != 0
#endif
)
return grub_error (GRUB_ERR_BAD_FS, "invalid cpio archive");
data->size = read_number (hd.filesize, ARRAY_SIZE (hd.filesize));
if (mtime)
*mtime = read_number (hd.mtime, ARRAY_SIZE (hd.mtime));
modeval = read_number (hd.mode, ARRAY_SIZE (hd.mode));
namesize = read_number (hd.namesize, ARRAY_SIZE (hd.namesize));
if (mode)
*mode = modeval;
*name = grub_malloc (namesize + 1);
if (*name == NULL)
return grub_errno;
if (grub_disk_read (data->disk, 0, data->hofs + sizeof (hd),
namesize, *name))
{
grub_free (*name);
return grub_errno;
}
(*name)[namesize] = 0;
if (data->size == 0 && modeval == 0 && namesize == 11
&& grub_memcmp(*name, "TRAILER!!!", 11) == 0)
{
*mode = GRUB_ARCHELP_ATTR_END;
grub_free (*name);
return GRUB_ERR_NONE;
}
data->dofs = data->hofs + ALIGN_CPIO (sizeof (hd) + namesize);
data->next_hofs = data->dofs + ALIGN_CPIO (data->size);
return GRUB_ERR_NONE;
}
static struct grub_hfsplus_data *
grub_hfsplus_mount (grub_disk_t disk)
{
struct grub_hfsplus_data *data;
struct grub_hfsplus_btheader header;
struct grub_hfsplus_btnode node;
grub_uint16_t magic;
union {
struct grub_hfs_sblock hfs;
struct grub_hfsplus_volheader hfsplus;
} volheader;
data = grub_malloc (sizeof (*data));
if (!data)
return 0;
data->disk = disk;
/* Read the bootblock. */
grub_disk_read (disk, GRUB_HFSPLUS_SBLOCK, 0, sizeof (volheader),
&volheader);
if (grub_errno)
goto fail;
data->embedded_offset = 0;
if (grub_be_to_cpu16 (volheader.hfs.magic) == GRUB_HFS_MAGIC)
{
grub_disk_addr_t extent_start;
grub_disk_addr_t ablk_size;
grub_disk_addr_t ablk_start;
/* See if there's an embedded HFS+ filesystem. */
if (grub_be_to_cpu16 (volheader.hfs.embed_sig) != GRUB_HFSPLUS_MAGIC)
{
grub_error (GRUB_ERR_BAD_FS, "not a HFS+ filesystem");
goto fail;
}
/* Calculate the offset needed to translate HFS+ sector numbers. */
extent_start = grub_be_to_cpu16 (volheader.hfs.embed_extent.first_block);
ablk_size = grub_be_to_cpu32 (volheader.hfs.blksz);
ablk_start = grub_be_to_cpu16 (volheader.hfs.first_block);
data->embedded_offset = (ablk_start
+ extent_start
* (ablk_size >> GRUB_DISK_SECTOR_BITS));
grub_disk_read (disk, data->embedded_offset + GRUB_HFSPLUS_SBLOCK, 0,
sizeof (volheader), &volheader);
if (grub_errno)
goto fail;
}
/* Iterate over the susp entries, starting with block SUA_BLOCK on the
offset SUA_POS with a size of SUA_SIZE bytes. Hook is called for
every entry. */
static grub_err_t
grub_iso9660_susp_iterate (struct grub_iso9660_data *data,
int sua_block, int sua_pos, int sua_size,
grub_err_t (*hook)
(struct grub_iso9660_susp_entry *entry))
{
char *sua;
struct grub_iso9660_susp_entry *entry;
auto grub_err_t load_sua (void);
/* Load a part of the System Usage Area. */
grub_err_t load_sua (void)
{
sua = grub_malloc (sua_size);
if (!sua)
return grub_errno;
if (grub_disk_read (data->disk, sua_block, sua_pos,
sua_size, sua))
return grub_errno;
entry = (struct grub_iso9660_susp_entry *) sua;
return 0;
}
/* Read LEN bytes from the file described by DATA starting with byte
POS. Return the amount of read bytes in READ. */
static grub_ssize_t
grub_hfs_read_file (struct grub_hfs_data *data,
void NESTED_FUNC_ATTR (*read_hook) (grub_disk_addr_t sector,
unsigned offset, unsigned length),
grub_off_t pos, grub_size_t len, char *buf)
{
grub_off_t i;
grub_off_t blockcnt;
blockcnt = grub_divmod64 (((len + pos)
+ data->blksz - 1), data->blksz, 0);
for (i = grub_divmod64 (pos, data->blksz, 0); i < blockcnt; i++)
{
grub_disk_addr_t blknr;
grub_off_t blockoff;
grub_off_t blockend = data->blksz;
int skipfirst = 0;
grub_divmod64 (pos, data->blksz, &blockoff);
blknr = grub_hfs_block (data, data->extents, data->fileid, i, 1);
if (grub_errno)
return -1;
/* Last block. */
if (i == blockcnt - 1)
{
grub_divmod64 ((len + pos), data->blksz, &blockend);
/* The last portion is exactly EXT2_BLOCK_SIZE (data). */
if (! blockend)
blockend = data->blksz;
}
/* First block. */
if (i == grub_divmod64 (pos, data->blksz, 0))
{
skipfirst = blockoff;
blockend -= skipfirst;
}
/* If the block number is 0 this block is not stored on disk but
is zero filled instead. */
if (blknr)
{
data->disk->read_hook = read_hook;
grub_disk_read (data->disk, blknr, skipfirst,
blockend, buf);
data->disk->read_hook = 0;
if (grub_errno)
return -1;
}
buf += data->blksz - skipfirst;
}
return len;
}
static struct grub_archelp_data *
grub_cpio_mount (grub_disk_t disk)
{
struct head hd;
struct grub_archelp_data *data;
if (grub_disk_read (disk, 0, 0, sizeof (hd), &hd))
goto fail;
if (grub_memcmp (hd.magic, MAGIC, sizeof (MAGIC) - 1)
#ifdef MAGIC2
&& grub_memcmp (hd.magic, MAGIC2, sizeof (MAGIC2) - 1)
#endif
)
goto fail;
data = (struct grub_archelp_data *) grub_zalloc (sizeof (*data));
if (!data)
goto fail;
data->disk = disk;
return data;
fail:
grub_error (GRUB_ERR_BAD_FS, "not a " FSNAME " filesystem");
return 0;
}
static grub_err_t
sun_pc_partition_map_iterate (grub_disk_t disk,
int (*hook) (grub_disk_t disk,
const grub_partition_t partition))
{
grub_partition_t p;
struct grub_sun_pc_block block;
int partnum;
grub_err_t err;
p = (grub_partition_t) grub_zalloc (sizeof (struct grub_partition));
if (! p)
return grub_errno;
p->partmap = &grub_sun_pc_partition_map;
err = grub_disk_read (disk, 1, 0, sizeof (struct grub_sun_pc_block), &block);
if (err)
{
grub_free (p);
return err;
}
if (GRUB_PARTMAP_SUN_PC_MAGIC != grub_le_to_cpu16 (block.magic))
{
grub_free (p);
return grub_error (GRUB_ERR_BAD_PART_TABLE,
"not a sun_pc partition table");
}
if (! grub_sun_is_valid (&block))
{
grub_free (p);
return grub_error (GRUB_ERR_BAD_PART_TABLE, "invalid checksum");
}
/* Maybe another error value would be better, because partition
table _is_ recognized but invalid. */
for (partnum = 0; partnum < GRUB_PARTMAP_SUN_PC_MAX_PARTS; partnum++)
{
struct grub_sun_pc_partition_descriptor *desc;
if (block.partitions[partnum].id == 0
|| block.partitions[partnum].id == GRUB_PARTMAP_SUN_PC_WHOLE_DISK_ID)
continue;
desc = &block.partitions[partnum];
p->start = grub_le_to_cpu32 (desc->start_sector);
p->len = grub_le_to_cpu32 (desc->num_sectors);
p->number = partnum;
if (p->len)
{
if (hook (disk, p))
partnum = GRUB_PARTMAP_SUN_PC_MAX_PARTS;
}
}
grub_free (p);
return grub_errno;
}
static grub_err_t
read_node (grub_fshelp_node_t node, grub_off_t off, grub_size_t len, char *buf)
{
grub_size_t i = 0;
while (len > 0)
{
grub_size_t toread;
grub_err_t err;
while (i < node->have_dirents
&& off >= grub_le_to_cpu32 (node->dirents[i].size))
{
off -= grub_le_to_cpu32 (node->dirents[i].size);
i++;
}
if (i == node->have_dirents)
return grub_error (GRUB_ERR_OUT_OF_RANGE, "read out of range");
toread = grub_le_to_cpu32 (node->dirents[i].size);
if (toread > len)
toread = len;
err = grub_disk_read (node->data->disk,
((grub_disk_addr_t) grub_le_to_cpu32 (node->dirents[i].first_sector)) << GRUB_ISO9660_LOG2_BLKSZ,
off, toread, buf);
if (err)
return err;
len -= toread;
off += toread;
buf += toread;
}
return GRUB_ERR_NONE;
}
/* Read the inode INO for the file described by DATA into INODE. */
static grub_err_t
grub_ext2_read_inode (struct grub_ext2_data *data,
int ino, struct grub_ext2_inode *inode)
{
struct grub_ext2_block_group blkgrp;
struct grub_ext2_sblock *sblock = &data->sblock;
int inodes_per_block;
unsigned int blkno;
unsigned int blkoff;
/* It is easier to calculate if the first inode is 0. */
ino--;
grub_ext2_blockgroup (data,
ino / grub_le_to_cpu32 (sblock->inodes_per_group),
&blkgrp);
if (grub_errno)
return grub_errno;
inodes_per_block = EXT2_BLOCK_SIZE (data) / EXT2_INODE_SIZE (data);
blkno = (ino % grub_le_to_cpu32 (sblock->inodes_per_group))
/ inodes_per_block;
blkoff = (ino % grub_le_to_cpu32 (sblock->inodes_per_group))
% inodes_per_block;
/* Read the inode. */
if (grub_disk_read (data->disk,
((grub_le_to_cpu32 (blkgrp.inode_table_id) + blkno)
<< LOG2_EXT2_BLOCK_SIZE (data)),
EXT2_INODE_SIZE (data) * blkoff,
sizeof (struct grub_ext2_inode), inode))
return grub_errno;
return 0;
}
static struct grub_cpio_data *
grub_cpio_mount (grub_disk_t disk)
{
struct head hd;
struct grub_cpio_data *data;
if (grub_disk_read (disk, 0, 0, sizeof (hd), &hd))
goto fail;
#ifndef MODE_USTAR
if (hd.magic != MAGIC_BCPIO)
#else
if (grub_memcmp (hd.magic, MAGIC_USTAR,
sizeof (MAGIC_USTAR) - 1))
#endif
goto fail;
data = (struct grub_cpio_data *) grub_malloc (sizeof (*data));
if (!data)
goto fail;
data->disk = disk;
return data;
fail:
grub_error (GRUB_ERR_BAD_FS, "not a "
#ifdef MODE_USTAR
"tar"
#else
"cpio"
#endif
" filesystem");
return 0;
}
static grub_err_t
read_sblock (grub_disk_t disk, struct grub_btrfs_superblock *sb)
{
unsigned i;
grub_err_t err = GRUB_ERR_NONE;
for (i = 0; i < ARRAY_SIZE (superblock_sectors); i++)
{
struct grub_btrfs_superblock sblock;
err = grub_disk_read (disk, superblock_sectors[i], 0,
sizeof (sblock), &sblock);
if (err == GRUB_ERR_OUT_OF_RANGE)
break;
if (grub_memcmp ((char *) sblock.signature, GRUB_BTRFS_SIGNATURE,
sizeof (GRUB_BTRFS_SIGNATURE) - 1) != 0)
break;
if (i == 0 || grub_le_to_cpu64 (sblock.generation)
> grub_le_to_cpu64 (sb->generation))
grub_memcpy (sb, &sblock, sizeof (sblock));
}
if ((err == GRUB_ERR_OUT_OF_RANGE || !err) && i == 0)
return grub_error (GRUB_ERR_BAD_FS, "not a Btrfs filesystem");
if (err == GRUB_ERR_OUT_OF_RANGE)
grub_errno = err = GRUB_ERR_NONE;
return err;
}
static char *
grub_sfs_read_symlink (grub_fshelp_node_t node)
{
struct grub_sfs_data *data = node->data;
char *symlink;
char *block;
block = grub_malloc (data->blocksize);
if (!block)
return 0;
grub_disk_read (data->disk, node->block, 0, data->blocksize, block);
if (grub_errno)
{
grub_free (block);
return 0;
}
/* This is just a wild guess, but it always worked for me. How the
SLNK block looks like is not documented in the SFS docs. */
symlink = grub_strdup (&block[24]);
grub_free (block);
if (!symlink)
return 0;
return symlink;
}
static PyObject *bits_disk_read(PyObject *self, PyObject *args)
{
PyObject *pyfile, *pystr;
grub_file_t file;
grub_disk_addr_t sector;
unsigned offset, length;
if (!PyArg_ParseTuple(args, "O!KII:disk_read", &PyFile_Type, &pyfile, §or, &offset, &length))
return NULL;
file = PyFile_AsFile(pyfile);
if (!file->device->disk)
return PyErr_Format(PyExc_RuntimeError, "Can't get disk device from non-disk-backed file");
pystr = PyString_FromStringAndSize(NULL, length);
if (!pystr)
return PyErr_NoMemory();
if (grub_disk_read(file->device->disk, sector, offset, length, PyString_AsString(pystr)) != GRUB_ERR_NONE) {
Py_DECREF(pystr);
return PyErr_SetFromErrno(PyExc_IOError);
}
return pystr;
}
static grub_err_t
grub_dmraid_nv_detect (grub_disk_t disk, struct grub_raid_array *array)
{
grub_disk_addr_t sector;
struct grub_nv_super sb;
if (disk->partition)
return grub_error (GRUB_ERR_OUT_OF_RANGE, "skip partition");
sector = grub_disk_get_size (disk) - 2;
if (grub_disk_read (disk, sector, 0, sizeof (sb), &sb))
return grub_errno;
if (grub_memcmp (sb.vendor, NV_ID_STRING, 6))
return grub_error (GRUB_ERR_OUT_OF_RANGE, "not raid");
if (sb.version != NV_VERSION)
return grub_error (GRUB_ERR_NOT_IMPLEMENTED_YET,
"unknown version: %d.%d", sb.version);
switch (sb.array.raid_level)
{
case NV_LEVEL_0:
array->level = 0;
array->disk_size = sb.capacity / sb.array.total_volumes;
break;
case NV_LEVEL_1:
array->level = 1;
array->disk_size = sb.capacity;
break;
case NV_LEVEL_5:
array->level = 5;
array->layout = GRUB_RAID_LAYOUT_LEFT_ASYMMETRIC;
array->disk_size = sb.capacity / (sb.array.total_volumes - 1);
break;
default:
return grub_error (GRUB_ERR_NOT_IMPLEMENTED_YET,
"unsupported RAID level: %d", sb.array.raid_level);
}
array->number = 0;
array->total_devs = sb.array.total_volumes;
array->chunk_size = sb.array.stripe_block_size;
array->disk_offset = 0;
array->index = sb.unit_number;
array->uuid_len = sizeof (sb.array.signature);
array->uuid = grub_malloc (sizeof (sb.array.signature));
if (! array->uuid)
return grub_errno;
grub_memcpy (array->uuid, (char *) &sb.array.signature,
sizeof (sb.array.signature));
return 0;
}
static grub_ssize_t
grub_cpio_read (grub_file_t file, char *buf, grub_size_t len)
{
struct grub_cpio_data *data;
data = file->data;
return (grub_disk_read (data->disk, 0, data->dofs + file->offset,
len, buf)) ? -1 : (grub_ssize_t) len;
}
static grub_err_t
sun_partition_map_iterate (grub_disk_t disk,
int (*hook) (grub_disk_t disk,
const grub_partition_t partition))
{
grub_partition_t p;
struct grub_disk raw;
struct grub_sun_block block;
int partnum;
raw = *disk;
raw.partition = 0;
p = (grub_partition_t) grub_malloc (sizeof (struct grub_partition));
if (! p)
return grub_errno;
p->offset = 0;
p->data = 0;
p->partmap = &grub_sun_partition_map;
if (grub_disk_read (&raw, 0, 0, sizeof (struct grub_sun_block),
(char *) &block) == GRUB_ERR_NONE)
{
if (GRUB_PARTMAP_SUN_MAGIC != grub_be_to_cpu16 (block.magic))
grub_error (GRUB_ERR_BAD_PART_TABLE, "not a sun partition table");
if (! grub_sun_is_valid (&block))
grub_error (GRUB_ERR_BAD_PART_TABLE, "invalid checksum");
/* Maybe another error value would be better, because partition
table _is_ recognized but invalid. */
for (partnum = 0; partnum < GRUB_PARTMAP_SUN_MAX_PARTS; partnum++)
{
struct grub_sun_partition_descriptor *desc;
if (block.infos[partnum].id == 0
|| block.infos[partnum].id == GRUB_PARTMAP_SUN_WHOLE_DISK_ID)
continue;
desc = &block.partitions[partnum];
p->start = ((grub_uint64_t) grub_be_to_cpu32 (desc->start_cylinder)
* grub_be_to_cpu16 (block.ntrks)
* grub_be_to_cpu16 (block.nsect));
p->len = grub_be_to_cpu32 (desc->num_sectors);
p->index = partnum;
if (p->len)
{
if (hook (disk, p))
partnum = GRUB_PARTMAP_SUN_MAX_PARTS;
}
}
}
grub_free (p);
return grub_errno;
}
/* Read into BLKGRP the blockgroup descriptor of blockgroup GROUP of
the mounted filesystem DATA. */
inline static grub_err_t
grub_ext2_blockgroup (struct grub_ext2_data *data, int group,
struct grub_ext2_block_group *blkgrp)
{
return grub_disk_read (data->disk,
((grub_le_to_cpu32 (data->sblock.first_data_block) + 1)
<< LOG2_EXT2_BLOCK_SIZE (data)),
group * sizeof (struct grub_ext2_block_group),
sizeof (struct grub_ext2_block_group), blkgrp);
}
static struct grub_ext2_data *
grub_ext2_mount (grub_disk_t disk)
{
struct grub_ext2_data *data;
data = grub_malloc (sizeof (struct grub_ext2_data));
if (!data)
return 0;
/* Read the superblock. */
grub_disk_read (disk, 1 * 2, 0, sizeof (struct grub_ext2_sblock),
&data->sblock);
if (grub_errno)
goto fail;
/* Make sure this is an ext2 filesystem. */
if (grub_le_to_cpu16 (data->sblock.magic) != EXT2_MAGIC)
{
grub_error (GRUB_ERR_BAD_FS, "not an ext2 filesystem");
goto fail;
}
/* Check the FS doesn't have feature bits enabled that we don't support. */
if (grub_le_to_cpu32 (data->sblock.feature_incompat)
& ~(EXT2_DRIVER_SUPPORTED_INCOMPAT | EXT2_DRIVER_IGNORED_INCOMPAT))
{
grub_error (GRUB_ERR_BAD_FS, "filesystem has unsupported incompatible features");
goto fail;
}
data->disk = disk;
data->diropen.data = data;
data->diropen.ino = 2;
data->diropen.inode_read = 1;
data->inode = &data->diropen.inode;
grub_ext2_read_inode (data, 2, data->inode);
if (grub_errno)
goto fail;
return data;
fail:
if (grub_errno == GRUB_ERR_OUT_OF_RANGE)
grub_error (GRUB_ERR_BAD_FS, "not an ext2 filesystem");
grub_free (data);
return 0;
}
static grub_ssize_t
grub_cbfs_read (grub_file_t file, char *buf, grub_size_t len)
{
struct grub_archelp_data *data;
grub_ssize_t ret;
data = file->data;
data->disk->read_hook = file->read_hook;
data->disk->read_hook_data = file->read_hook_data;
ret = (grub_disk_read (data->disk, 0, data->dofs + file->offset,
len, buf)) ? -1 : (grub_ssize_t) len;
data->disk->read_hook = 0;
return ret;
}
static grub_err_t
sun_partition_map_iterate (grub_disk_t disk,
int (*hook) (grub_disk_t disk,
const grub_partition_t partition))
{
struct grub_partition p;
struct grub_sun_block block;
int partnum;
grub_err_t err;
p.partmap = &grub_sun_partition_map;
err = grub_disk_read (disk, 0, 0, sizeof (struct grub_sun_block),
&block);
if (err)
return err;
if (GRUB_PARTMAP_SUN_MAGIC != grub_be_to_cpu16 (block.magic))
return grub_error (GRUB_ERR_BAD_PART_TABLE, "not a sun partition table");
if (! grub_sun_is_valid (&block))
return grub_error (GRUB_ERR_BAD_PART_TABLE, "invalid checksum");
/* Maybe another error value would be better, because partition
table _is_ recognized but invalid. */
for (partnum = 0; partnum < GRUB_PARTMAP_SUN_MAX_PARTS; partnum++)
{
struct grub_sun_partition_descriptor *desc;
if (block.infos[partnum].id == 0
|| block.infos[partnum].id == GRUB_PARTMAP_SUN_WHOLE_DISK_ID)
continue;
desc = &block.partitions[partnum];
p.start = ((grub_uint64_t) grub_be_to_cpu32 (desc->start_cylinder)
* grub_be_to_cpu16 (block.ntrks)
* grub_be_to_cpu16 (block.nsect));
p.len = grub_be_to_cpu32 (desc->num_sectors);
p.number = p.index = partnum;
if (p.len)
{
if (hook (disk, &p))
partnum = GRUB_PARTMAP_SUN_MAX_PARTS;
}
}
return grub_errno;
}
int
grub_util_is_ldm (grub_disk_t disk)
{
int i;
int has_ldm = msdos_has_ldm_partition (disk);
for (i = 0; i < 3; i++)
{
grub_disk_addr_t sector = LDM_LABEL_SECTOR;
grub_err_t err;
struct grub_ldm_label label;
switch (i)
{
case 0:
if (!has_ldm)
continue;
sector = LDM_LABEL_SECTOR;
break;
case 1:
/* LDM is never inside a partition. */
if (!has_ldm || disk->partition)
continue;
sector = grub_disk_get_size (disk);
if (sector == GRUB_DISK_SIZE_UNKNOWN)
continue;
sector--;
break;
/* FIXME: try the third copy. */
case 2:
sector = gpt_ldm_sector (disk);
if (!sector)
continue;
break;
}
err = grub_disk_read (disk, sector, 0, sizeof(label), &label);
if (err)
{
grub_errno = GRUB_ERR_NONE;
return 0;
}
/* This check is more relaxed on purpose. */
if (grub_memcmp (label.magic, LDM_MAGIC, sizeof (label.magic)) == 0)
return 1;
}
return 0;
}
static grub_err_t
decomp_nextvcn (struct grub_ntfs_comp *cc)
{
if (cc->comp_head >= cc->comp_tail)
return grub_error (GRUB_ERR_BAD_FS, "compression block overflown");
if (grub_disk_read
(cc->disk,
(cc->comp_table[cc->comp_head][1] -
(cc->comp_table[cc->comp_head][0] - cc->cbuf_vcn)) * cc->spc, 0,
cc->spc << BLK_SHR, cc->cbuf))
return grub_errno;
cc->cbuf_vcn++;
if ((cc->cbuf_vcn >= cc->comp_table[cc->comp_head][0]))
cc->comp_head++;
cc->cbuf_ofs = 0;
return 0;
}
static grub_err_t
dvh_partition_map_iterate (grub_disk_t disk,
int (*hook) (grub_disk_t disk,
const grub_partition_t partition))
{
struct grub_partition p;
union
{
struct grub_dvh_block dvh;
grub_uint32_t raw[0];
} block;
unsigned partnum;
grub_err_t err;
p.partmap = &grub_dvh_partition_map;
err = grub_disk_read (disk, 0, 0, sizeof (struct grub_dvh_block),
&block);
if (err)
return err;
if (DVH_MAGIC != grub_be_to_cpu32 (block.dvh.magic))
return grub_error (GRUB_ERR_BAD_PART_TABLE, "not a dvh partition table");
if (! grub_dvh_is_valid (block.raw))
return grub_error (GRUB_ERR_BAD_PART_TABLE, "invalid checksum");
/* Maybe another error value would be better, because partition
table _is_ recognized but invalid. */
for (partnum = 0; partnum < ARRAY_SIZE (block.dvh.parts); partnum++)
{
if (block.dvh.parts[partnum].length == 0)
continue;
if (partnum == 10)
continue;
p.start = grub_be_to_cpu32 (block.dvh.parts[partnum].start);
p.len = grub_be_to_cpu32 (block.dvh.parts[partnum].length);
p.number = p.index = partnum;
if (hook (disk, &p))
break;
}
return grub_errno;
}
static grub_err_t
decomp_nextvcn (struct grub_ntfs_comp *cc)
{
if (cc->comp_head >= cc->comp_tail)
return grub_error (GRUB_ERR_BAD_FS, "compression block overflown");
if (grub_disk_read
(cc->disk,
(cc->comp_table[cc->comp_head].next_lcn -
(cc->comp_table[cc->comp_head].next_vcn - cc->cbuf_vcn)) << cc->log_spc,
0,
1 << (cc->log_spc + GRUB_NTFS_BLK_SHR), cc->cbuf))
return grub_errno;
cc->cbuf_vcn++;
if ((cc->cbuf_vcn >= cc->comp_table[cc->comp_head].next_vcn))
cc->comp_head++;
cc->cbuf_ofs = 0;
return 0;
}
static char *
grub_affs_read_symlink (grub_fshelp_node_t node)
{
struct grub_affs_data *data = node->data;
char *symlink;
symlink = grub_malloc (GRUB_AFFS_SYMLINK_SIZE (data->blocksize));
if (!symlink)
return 0;
grub_disk_read (data->disk, node->block, GRUB_AFFS_SYMLINK_OFFSET,
GRUB_AFFS_SYMLINK_SIZE (data->blocksize), symlink);
if (grub_errno)
{
grub_free (symlink);
return 0;
}
grub_dprintf ("affs", "Symlink: `%s'\n", symlink);
return symlink;
}
static grub_err_t
grub_gpt_device_partentry (grub_device_t device,
struct grub_gpt_partentry *entry)
{
grub_disk_t disk = device->disk;
grub_partition_t p;
grub_err_t err;
if (!disk || !disk->partition)
return grub_error (GRUB_ERR_BUG, "not a partition");
if (grub_strcmp (disk->partition->partmap->name, "gpt"))
return grub_error (GRUB_ERR_BAD_ARGUMENT, "not a GPT partition");
p = disk->partition;
disk->partition = p->parent;
err = grub_disk_read (disk, p->offset, p->index, sizeof (*entry), entry);
disk->partition = p;
return err;
}
static char *
grub_cpio_get_link_target (struct grub_archelp_data *data)
{
char *ret;
grub_err_t err;
if (data->size == 0)
return grub_strdup ("");
ret = grub_malloc (data->size + 1);
if (!ret)
return NULL;
err = grub_disk_read (data->disk, 0, data->dofs, data->size,
ret);
if (err)
{
grub_free (ret);
return NULL;
}
ret[data->size] = '\0';
return ret;
}
static struct grub_ext4_extent_header *
grub_ext4_find_leaf (struct grub_ext2_data *data, char *buf,
struct grub_ext4_extent_header *ext_block,
grub_uint32_t fileblock)
{
struct grub_ext4_extent_idx *index;
while (1)
{
int i;
grub_disk_addr_t block;
index = (struct grub_ext4_extent_idx *) (ext_block + 1);
if (grub_le_to_cpu16(ext_block->magic) != EXT4_EXT_MAGIC)
return 0;
if (ext_block->depth == 0)
return ext_block;
for (i = 0; i < grub_le_to_cpu16 (ext_block->entries); i++)
{
if (fileblock < grub_le_to_cpu32(index[i].block))
break;
}
if (--i < 0)
return 0;
block = grub_le_to_cpu16 (index[i].leaf_hi);
block = (block << 32) + grub_le_to_cpu32 (index[i].leaf);
if (grub_disk_read (data->disk,
block << LOG2_EXT2_BLOCK_SIZE (data),
0, EXT2_BLOCK_SIZE(data), buf))
return 0;
ext_block = (struct grub_ext4_extent_header *) buf;
}
}
