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grub/fs/reiserfs.c
robertmh 1a8b05264d 2008-01-21 Robert Millan <rmh@aybabtu.com> 
Fix detection of very small filesystems (like tar).

        * fs/reiserfs.c (grub_reiserfs_mount): When disk is too small to
        contain a ReiserFS, abort with GRUB_ERR_BAD_FS rather than
        GRUB_ERR_OUT_OF_RANGE (which made the upper layer think there's
        a problem with this disk).
2008-01-21 14:32:49 +00:00

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/* reiserfs.c - ReiserFS versions up to 3.6 */
/*
* GRUB -- GRand Unified Bootloader
* Copyright (C) 2003,2004,2005,2008 Free Software Foundation, Inc.
*
* GRUB is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* GRUB is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with GRUB. If not, see <http://www.gnu.org/licenses/>.
*/
/*
TODO:
implement journal handling (ram replay)
test tail packing & direct files
validate partition label position
*/
#warning "TODO : journal, tail packing (?)"
#if 0
# define GRUB_REISERFS_DEBUG
# define GRUB_REISERFS_JOURNALING
# define GRUB_HEXDUMP
#endif
#include <grub/err.h>
#include <grub/file.h>
#include <grub/mm.h>
#include <grub/misc.h>
#include <grub/disk.h>
#include <grub/dl.h>
#include <grub/types.h>
#include <grub/fshelp.h>
#define MIN(a, b) \
({ typeof (a) _a = (a); \
typeof (b) _b = (b); \
_a < _b ? _a : _b; })
#define MAX(a, b) \
({ typeof (a) _a = (a); \
typeof (b) _b = (b); \
_a > _b ? _a : _b; })
#define REISERFS_SUPER_BLOCK_OFFSET 0x10000
#define REISERFS_MAGIC_LEN 12
#define REISERFS_MAGIC_STRING "ReIsEr2Fs\0\0\0"
/* If the 3rd bit of an item state is set, then it's visible. */
#define GRUB_REISERFS_VISIBLE_MASK ((grub_uint16_t) 0x04)
#define REISERFS_MAX_LABEL_LENGTH 16
#define REISERFS_LABEL_OFFSET 0x64
#define S_IFLNK 0xA000
#ifndef GRUB_UTIL
static grub_dl_t my_mod;
#endif
#define assert(boolean) real_assert (boolean, __FILE__, __LINE__)
static inline void
real_assert (int boolean, const char *file, const int line)
{
if (! boolean)
grub_printf ("Assertion failed at %s:%d\n", file, line);
}
enum grub_reiserfs_item_type
{
GRUB_REISERFS_STAT,
GRUB_REISERFS_DIRECTORY,
GRUB_REISERFS_DIRECT,
GRUB_REISERFS_INDIRECT,
/* Matches both _DIRECT and _INDIRECT when searching. */
GRUB_REISERFS_ANY,
GRUB_REISERFS_UNKNOWN
};
struct grub_reiserfs_superblock
{
grub_uint32_t block_count;
grub_uint32_t block_free_count;
grub_uint32_t root_block;
grub_uint32_t journal_block;
grub_uint32_t journal_device;
grub_uint32_t journal_original_size;
grub_uint32_t journal_max_transaction_size;
grub_uint32_t journal_block_count;
grub_uint32_t journal_max_batch;
grub_uint32_t journal_max_commit_age;
grub_uint32_t journal_max_transaction_age;
grub_uint16_t block_size;
grub_uint16_t oid_max_size;
grub_uint16_t oid_current_size;
grub_uint16_t state;
grub_uint8_t magic_string[REISERFS_MAGIC_LEN];
grub_uint32_t function_hash_code;
grub_uint16_t tree_height;
grub_uint16_t bitmap_number;
grub_uint16_t version;
grub_uint16_t reserved;
grub_uint32_t inode_generation;
} __attribute__ ((packed));
#ifdef GRUB_REISERFS_JOURNALING
# error "Journaling not yet supported."
struct grub_reiserfs_journal_header
{
grub_uint32_t last_flush_uid;
grub_uint32_t unflushed_offset;
grub_uint32_t mount_id;
} __attribute__ ((packed));
struct grub_reiserfs_transaction_header
{
grub_uint32_t id;
grub_uint32_t len;
grub_uint32_t mount_id;
char *data;
char checksum[12];
} __attribute__ ((packed));
#endif
struct grub_reiserfs_stat_item_v1
{
grub_uint16_t mode;
grub_uint16_t hardlink_count;
grub_uint16_t uid;
grub_uint16_t gid;
grub_uint32_t size;
grub_uint32_t atime;
grub_uint32_t mtime;
grub_uint32_t ctime;
grub_uint32_t rdev;
grub_uint32_t first_direct_byte;
} __attribute__ ((packed));
struct grub_reiserfs_stat_item_v2
{
grub_uint16_t mode;
grub_uint16_t reserved;
grub_uint32_t hardlink_count;
grub_uint64_t size;
grub_uint32_t uid;
grub_uint32_t gid;
grub_uint32_t atime;
grub_uint32_t mtime;
grub_uint32_t ctime;
grub_uint32_t blocks;
grub_uint32_t first_direct_byte;
} __attribute__ ((packed));
struct grub_reiserfs_key
{
grub_uint32_t directory_id;
grub_uint32_t object_id;
union
{
struct
{
grub_uint32_t offset;
grub_uint32_t type;
} v1 __attribute__ ((packed));
struct
{
grub_uint64_t offset_type;
} v2 __attribute__ ((packed));
} u;
} __attribute__ ((packed));
struct grub_reiserfs_item_header
{
struct grub_reiserfs_key key;
union
{
grub_uint16_t free_space;
grub_uint16_t entry_count;
} u __attribute__ ((packed));
grub_uint16_t item_size;
grub_uint16_t item_location;
grub_uint16_t version;
} __attribute__ ((packed));
struct grub_reiserfs_block_header
{
grub_uint16_t level;
grub_uint16_t item_count;
grub_uint16_t free_space;
grub_uint16_t reserved;
struct grub_reiserfs_key block_right_delimiting_key;
} __attribute__ ((packed));
struct grub_reiserfs_disk_child
{
grub_uint32_t block_number;
grub_uint16_t size;
grub_uint16_t reserved;
} __attribute__ ((packed));
struct grub_reiserfs_directory_header
{
grub_uint32_t offset;
grub_uint32_t directory_id;
grub_uint32_t object_id;
grub_uint16_t location;
grub_uint16_t state;
} __attribute__ ((packed));
struct grub_fshelp_node
{
struct grub_reiserfs_data *data;
grub_uint32_t block_number; /* 0 if node is not found. */
grub_uint16_t block_position;
enum grub_reiserfs_item_type type; /* To know how to read the header. */
struct grub_reiserfs_item_header header;
};
/* Returned when opening a file. */
struct grub_reiserfs_data
{
struct grub_reiserfs_superblock superblock;
grub_disk_t disk;
};
/* Internal-only functions. Not to be used outside of this file. */
/* Return the type of given v2 key. */
static enum grub_reiserfs_item_type
grub_reiserfs_get_key_v2_type (const struct grub_reiserfs_key *key)
{
switch (grub_le_to_cpu64 (key->u.v2.offset_type) >> 60)
{
case 0:
return GRUB_REISERFS_STAT;
case 15:
return GRUB_REISERFS_ANY;
case 3:
return GRUB_REISERFS_DIRECTORY;
case 2:
return GRUB_REISERFS_DIRECT;
case 1:
return GRUB_REISERFS_INDIRECT;
}
return GRUB_REISERFS_UNKNOWN;
}
/* Return the type of given v1 key. */
static enum grub_reiserfs_item_type
grub_reiserfs_get_key_v1_type (const struct grub_reiserfs_key *key)
{
switch (grub_le_to_cpu32 (key->u.v1.type))
{
case 0:
return GRUB_REISERFS_STAT;
case 555:
return GRUB_REISERFS_ANY;
case 500:
return GRUB_REISERFS_DIRECTORY;
case 0x20000000:
case 0xFFFFFFFF:
return GRUB_REISERFS_DIRECT;
case 0x10000000:
case 0xFFFFFFFE:
return GRUB_REISERFS_INDIRECT;
}
return GRUB_REISERFS_UNKNOWN;
}
/* Return 1 if the given key is version 1 key, 2 otherwise. */
static int
grub_reiserfs_get_key_version (const struct grub_reiserfs_key *key)
{
return grub_reiserfs_get_key_v1_type (key) == GRUB_REISERFS_UNKNOWN ? 2 : 1;
}
#ifdef GRUB_HEXDUMP
static void
grub_hexdump (char *buffer, grub_size_t len)
{
grub_size_t a;
for (a = 0; a < len; a++)
{
if (! (a & 0x0F))
grub_printf ("\n%08x ", a);
grub_printf ("%02x ",
((unsigned int) ((unsigned char *) buffer)[a]) & 0xFF);
}
grub_printf ("\n");
}
#endif
#ifdef GRUB_REISERFS_DEBUG
static grub_uint64_t
grub_reiserfs_get_key_offset (const struct grub_reiserfs_key *key);
static enum grub_reiserfs_item_type
grub_reiserfs_get_key_type (const struct grub_reiserfs_key *key);
static void
grub_reiserfs_print_key (const struct grub_reiserfs_key *key)
{
unsigned int a;
char *reiserfs_type_strings[] = {
"stat ",
"directory",
"direct ",
"indirect ",
"any ",
"unknown "
};
for (a = 0; a < sizeof (struct grub_reiserfs_key); a++)
grub_printf ("%02x ", ((unsigned int) ((unsigned char *) key)[a]) & 0xFF);
grub_printf ("parent id = 0x%08x, self id = 0x%08x, type = %s, offset = ",
grub_le_to_cpu32 (key->directory_id),
grub_le_to_cpu32 (key->object_id),
reiserfs_type_strings [grub_reiserfs_get_key_type (key)]);
if (grub_reiserfs_get_key_version (key) == 1)
grub_printf("%08x", (unsigned int) grub_reiserfs_get_key_offset (key));
else
grub_printf("0x%07x%08x",
(unsigned) (grub_reiserfs_get_key_offset (key) >> 32),
(unsigned) (grub_reiserfs_get_key_offset (key) & 0xFFFFFFFF));
grub_printf ("\n");
}
#endif
/* Return the offset of given key. */
static grub_uint64_t
grub_reiserfs_get_key_offset (const struct grub_reiserfs_key *key)
{
if (grub_reiserfs_get_key_version (key) == 1)
return grub_le_to_cpu32 (key->u.v1.offset);
else
return grub_le_to_cpu64 (key->u.v2.offset_type) & (~0ULL >> 4);
}
/* Set the offset of given key. */
static void
grub_reiserfs_set_key_offset (struct grub_reiserfs_key *key,
grub_uint64_t value)
{
if (grub_reiserfs_get_key_version (key) == 1)
key->u.v1.offset = grub_cpu_to_le32 (value);
else
key->u.v2.offset_type \
= ((key->u.v2.offset_type & grub_cpu_to_le64 (15ULL << 60))
| grub_cpu_to_le64 (value & (~0ULL >> 4)));
}
/* Return the type of given key. */
static enum grub_reiserfs_item_type
grub_reiserfs_get_key_type (const struct grub_reiserfs_key *key)
{
if (grub_reiserfs_get_key_version (key) == 1)
return grub_reiserfs_get_key_v1_type (key);
else
return grub_reiserfs_get_key_v2_type (key);
}
/* Set the type of given key, with given version number. */
static void
grub_reiserfs_set_key_type (struct grub_reiserfs_key *key,
enum grub_reiserfs_item_type grub_type,
int version)
{
grub_uint32_t type;
switch (grub_type)
{
case GRUB_REISERFS_STAT:
type = 0;
break;
case GRUB_REISERFS_ANY:
type = (version == 1) ? 555 : 15;
break;
case GRUB_REISERFS_DIRECTORY:
type = (version == 1) ? 500 : 3;
break;
case GRUB_REISERFS_DIRECT:
type = (version == 1) ? 0xFFFFFFFF : 2;
break;
case GRUB_REISERFS_INDIRECT:
type = (version == 1) ? 0xFFFFFFFE : 1;
break;
default:
return;
}
if (version == 1)
key->u.v1.type = grub_cpu_to_le32 (type);
else
key->u.v2.offset_type
= ((key->u.v2.offset_type & grub_cpu_to_le64 (~0ULL >> 4))
| grub_cpu_to_le64 ((grub_uint64_t) type << 60));
assert (grub_reiserfs_get_key_type (key) == grub_type);
}
/* -1 if key 1 if lower than key 2.
0 if key 1 is equal to key 2.
1 if key 1 is higher than key 2. */
static int
grub_reiserfs_compare_keys (const struct grub_reiserfs_key *key1,
const struct grub_reiserfs_key *key2)
{
grub_uint64_t offset1, offset2;
enum grub_reiserfs_item_type type1, type2;
grub_uint32_t id1, id2;
if (! key1 || ! key2)
return -2;
id1 = grub_le_to_cpu32 (key1->directory_id);
id2 = grub_le_to_cpu32 (key2->directory_id);
if (id1 < id2)
return -1;
if (id1 > id2)
return 1;
id1 = grub_le_to_cpu32 (key1->object_id);
id2 = grub_le_to_cpu32 (key2->object_id);
if (id1 < id2)
return -1;
if (id1 > id2)
return 1;
offset1 = grub_reiserfs_get_key_offset (key1);
offset2 = grub_reiserfs_get_key_offset (key2);
if (offset1 < offset2)
return -1;
if (offset1 > offset2)
return 1;
type1 = grub_reiserfs_get_key_type (key1);
type2 = grub_reiserfs_get_key_type (key2);
if ((type1 == GRUB_REISERFS_ANY
&& (type2 == GRUB_REISERFS_DIRECT
|| type2 == GRUB_REISERFS_INDIRECT))
|| (type2 == GRUB_REISERFS_ANY
&& (type1 == GRUB_REISERFS_DIRECT
|| type1 == GRUB_REISERFS_INDIRECT)))
return 0;
if (type1 < type2)
return -1;
if (type1 > type2)
return 1;
return 0;
}
/* Find the item identified by KEY in mounted filesystem DATA, and fill ITEM
accordingly to what was found. */
static grub_err_t
grub_reiserfs_get_item (struct grub_reiserfs_data *data,
const struct grub_reiserfs_key *key,
struct grub_fshelp_node *item)
{
grub_uint32_t block_number;
struct grub_reiserfs_block_header *block_header = 0;
struct grub_reiserfs_key *block_key = 0;
grub_uint16_t block_size, item_count, current_level;
grub_uint16_t i;
grub_uint16_t previous_level = ~0;
struct grub_reiserfs_item_header *item_headers = 0;
if (! data)
{
grub_error (GRUB_ERR_TEST_FAILURE, "data is NULL");
goto fail;
}
if (! key)
{
grub_error (GRUB_ERR_TEST_FAILURE, "key is NULL");
goto fail;
}
if (! item)
{
grub_error (GRUB_ERR_TEST_FAILURE, "item is NULL");
goto fail;
}
block_size = grub_le_to_cpu16 (data->superblock.block_size);
block_number = grub_le_to_cpu32 (data->superblock.root_block);
#ifdef GRUB_REISERFS_DEBUG
grub_printf("Searching for ");
grub_reiserfs_print_key (key);
#endif
block_header = grub_malloc (block_size);
if (! block_header)
goto fail;
do
{
grub_disk_read (data->disk,
(((grub_disk_addr_t) block_number * block_size)
>> GRUB_DISK_SECTOR_BITS),
(((grub_off_t) block_number * block_size)
& (GRUB_DISK_SECTOR_SIZE - 1)),
block_size, (char *) block_header);
if (grub_errno)
goto fail;
current_level = grub_le_to_cpu16 (block_header->level);
grub_dprintf ("reiserfs_tree", " at level %d\n", current_level);
if (current_level >= previous_level)
{
grub_dprintf ("reiserfs_tree", "level loop detected, aborting\n");
grub_error (GRUB_ERR_FILE_READ_ERROR, "level loop");
goto fail;
}
previous_level = current_level;
item_count = grub_le_to_cpu16 (block_header->item_count);
grub_dprintf ("reiserfs_tree", " number of contained items : %d\n",
item_count);
if (current_level > 1)
{
/* Internal node. Navigate to the child that should contain
the searched key. */
struct grub_reiserfs_key *keys
= (struct grub_reiserfs_key *) (block_header + 1);
struct grub_reiserfs_disk_child *children
= ((struct grub_reiserfs_disk_child *)
(keys + item_count));
for (i = 0;
i < item_count
&& grub_reiserfs_compare_keys (key, &(keys[i])) >= 0;
i++)
{
#ifdef GRUB_REISERFS_DEBUG
grub_printf("i %03d/%03d ", i + 1, item_count + 1);
grub_reiserfs_print_key (&(keys[i]));
#endif
}
block_number = grub_le_to_cpu32 (children[i].block_number);
#ifdef GRUB_REISERFS_DEBUG
if (i == item_count
|| grub_reiserfs_compare_keys (key, &(keys[i])) == 0)
grub_printf(">");
else
grub_printf("<");
if (i < item_count)
{
grub_printf (" %03d/%03d ", i + 1, item_count + 1);
grub_reiserfs_print_key (&(keys[i]));
if (i + 1 < item_count)
{
grub_printf ("+ %03d/%03d ", i + 2, item_count);
grub_reiserfs_print_key (&(keys[i + 1]));
}
}
else
grub_printf ("Accessing rightmost child at block %d.\n",
block_number);
#endif
}
else
{
/* Leaf node. Check that the key is actually present. */
item_headers
= (struct grub_reiserfs_item_header *) (block_header + 1);
for (i = 0;
i < item_count
&& (grub_reiserfs_compare_keys (key, &(item_headers[i].key))
!= 0);
i++)
{
#ifdef GRUB_REISERFS_DEBUG
if (key->directory_id == item_headers[i].key.directory_id && \
key->object_id == item_headers[i].key.object_id)
grub_printf("C");
else
grub_printf(" ");
grub_printf(" %03d/%03d ", i + 1, item_count);
grub_reiserfs_print_key (&(item_headers[i].key));
#endif
}
if (i < item_count)
block_key = &(item_headers[i].key);
}
}
while (current_level > 1);
item->data = data;
if (i == item_count || grub_reiserfs_compare_keys (key, block_key))
{
item->block_number = 0;
item->block_position = 0;
item->type = GRUB_REISERFS_UNKNOWN;
#ifdef GRUB_REISERFS_DEBUG
grub_printf("Not found.\n");
#endif
}
else
{
item->block_number = block_number;
item->block_position = i;
item->type = grub_reiserfs_get_key_type (block_key);
grub_memcpy (&(item->header), &(item_headers[i]),
sizeof (struct grub_reiserfs_item_header));
#ifdef GRUB_REISERFS_DEBUG
grub_printf ("F %03d/%03d ", i + 1, item_count);
grub_reiserfs_print_key (block_key);
#endif
}
assert (grub_errno == GRUB_ERR_NONE);
grub_free (block_header);
return GRUB_ERR_NONE;
fail:
assert (grub_errno != GRUB_ERR_NONE);
grub_free (block_header);
assert (grub_errno != GRUB_ERR_NONE);
return grub_errno;
}
/* Return the path of the file which is pointed at by symlink NODE. */
static char *
grub_reiserfs_read_symlink (grub_fshelp_node_t node)
{
char *symlink_buffer = 0;
grub_uint16_t block_size;
grub_disk_addr_t block;
grub_off_t offset;
grub_size_t len;
struct grub_fshelp_node found;
struct grub_reiserfs_key key;
grub_memcpy (&key, &(node->header.key), sizeof (key));
grub_reiserfs_set_key_offset (&key, 1);
grub_reiserfs_set_key_type (&key, GRUB_REISERFS_DIRECT,
grub_reiserfs_get_key_version (&key));
if (grub_reiserfs_get_item (node->data, &key, &found) != GRUB_ERR_NONE)
goto fail;
if (found.block_number == 0)
goto fail;
block_size = grub_le_to_cpu16 (node->data->superblock.block_size);
len = grub_le_to_cpu16 (found.header.item_size);
block = (((grub_disk_addr_t) found.block_number * block_size)
>> GRUB_DISK_SECTOR_BITS);
offset = grub_le_to_cpu16 (found.header.item_location);
symlink_buffer = grub_malloc (len);
if (! symlink_buffer)
goto fail;
grub_disk_read (node->data->disk, block, offset, len, symlink_buffer);
if (grub_errno)
goto fail;
return symlink_buffer;
fail:
grub_free (symlink_buffer);
return 0;
}
/* Fill the mounted filesystem structure and return it. */
static struct grub_reiserfs_data *
grub_reiserfs_mount (grub_disk_t disk)
{
struct grub_reiserfs_data *data = 0;
data = grub_malloc (sizeof (*data));
if (! data)
goto fail;
grub_disk_read (disk, REISERFS_SUPER_BLOCK_OFFSET / GRUB_DISK_SECTOR_SIZE,
0, sizeof (data->superblock), (char *) &(data->superblock));
if (grub_errno)
goto fail;
if (grub_memcmp (data->superblock.magic_string,
REISERFS_MAGIC_STRING, REISERFS_MAGIC_LEN))
{
grub_error (GRUB_ERR_BAD_FS, "not a reiserfs filesystem");
goto fail;
}
data->disk = disk;
return data;
fail:
/* Disk is too small to contain a ReiserFS. */
if (grub_errno == GRUB_ERR_OUT_OF_RANGE)
grub_error (GRUB_ERR_BAD_FS, "not a reiserfs filesystem");
grub_free (data);
return 0;
}
/* Call HOOK for each file in directory ITEM. */
static int
grub_reiserfs_iterate_dir (grub_fshelp_node_t item,
int NESTED_FUNC_ATTR
(*hook) (const char *filename,
enum grub_fshelp_filetype filetype,
grub_fshelp_node_t node))
{
struct grub_reiserfs_data *data = item->data;
struct grub_reiserfs_block_header *block_header = 0;
grub_uint16_t block_size, block_position;
grub_uint32_t block_number;
int ret = 0;
if (item->type != GRUB_REISERFS_DIRECTORY)
{
grub_error (GRUB_ERR_BAD_FILE_TYPE,
"grub_reiserfs_iterate_dir called on a non-directory item");
goto fail;
}
block_size = grub_le_to_cpu16 (data->superblock.block_size);
block_header = grub_malloc (block_size);
if (! block_header)
goto fail;
block_number = item->block_number;
block_position = item->block_position;
grub_dprintf ("reiserfs", "Iterating directory...\n");
do
{
struct grub_reiserfs_directory_header *directory_headers;
struct grub_fshelp_node directory_item;
grub_uint16_t entry_count, entry_number;
struct grub_reiserfs_item_header *item_headers;
grub_uint64_t key_offset;
grub_disk_read (data->disk,
(((grub_disk_addr_t) block_number * block_size)
>> GRUB_DISK_SECTOR_BITS),
(((grub_off_t) block_number * block_size)
& (GRUB_DISK_SECTOR_SIZE - 1)),
block_size, (char *) block_header);
if (grub_errno)
goto fail;
#if 0
if (grub_le_to_cpu16 (block_header->level) != 1)
{
grub_error (GRUB_ERR_TEST_FAILURE,
"reiserfs: block %d is not a leaf block",
block_number);
goto fail;
}
#endif
item_headers = (struct grub_reiserfs_item_header *) (block_header + 1);
directory_headers
= ((struct grub_reiserfs_directory_header *)
((char *) block_header
+ grub_le_to_cpu16 (item_headers[block_position].item_location)));
entry_count
= grub_le_to_cpu16 (item_headers[block_position].u.entry_count);
for (entry_number = 0; entry_number < entry_count; entry_number++)
{
struct grub_reiserfs_directory_header *directory_header
= &directory_headers[entry_number];
grub_uint16_t entry_state
= grub_le_to_cpu16 (directory_header->state);
if (entry_state & GRUB_REISERFS_VISIBLE_MASK)
{
grub_fshelp_node_t entry_item;
struct grub_reiserfs_key entry_key;
enum grub_reiserfs_item_type entry_type;
char *entry_name;
entry_name = (((char *) directory_headers)
+ grub_le_to_cpu16 (directory_header->location));
entry_key.directory_id = directory_header->directory_id;
entry_key.object_id = directory_header->object_id;
entry_key.u.v2.offset_type = 0;
grub_reiserfs_set_key_type (&entry_key, GRUB_REISERFS_DIRECTORY,
2);
grub_reiserfs_set_key_offset (&entry_key, 1);
entry_item = grub_malloc (sizeof (*entry_item));
if (! entry_item)
goto fail;
if (grub_reiserfs_get_item (data, &entry_key, entry_item)
!= GRUB_ERR_NONE)
{
grub_free (entry_item);
goto fail;
}
if (entry_item->type == GRUB_REISERFS_DIRECTORY)
entry_type = GRUB_FSHELP_DIR;
else
{
grub_uint32_t entry_block_number;
/* Order is very important here.
First set the offset to 0 using current key version.
Then change the key type, which influes on key version
detection. */
grub_reiserfs_set_key_offset (&entry_key, 0);
grub_reiserfs_set_key_type (&entry_key, GRUB_REISERFS_STAT,
2);
if (grub_reiserfs_get_item (data, &entry_key, entry_item)
!= GRUB_ERR_NONE)
{
grub_free (entry_item);
goto fail;
}
if (entry_item->block_number != 0)
{
grub_uint16_t entry_version;
entry_version
= grub_le_to_cpu16 (entry_item->header.version);
entry_block_number = entry_item->block_number;
#if 0
grub_dprintf ("reiserfs",
"version %04x block %08x (%08x) position %08x\n",
entry_version, entry_block_number,
((grub_disk_addr_t) entry_block_number * block_size) / GRUB_DISK_SECTOR_SIZE,
grub_le_to_cpu16 (entry_item->header.item_location));
#endif
if (entry_version == 0) /* Version 1 stat item. */
{
struct grub_reiserfs_stat_item_v1 entry_v1_stat;
grub_disk_read (data->disk,
((grub_disk_addr_t) entry_block_number * block_size) >> GRUB_DISK_SECTOR_BITS,
grub_le_to_cpu16 (entry_item->header.item_location),
sizeof (entry_v1_stat),
(char *) &entry_v1_stat);
if (grub_errno)
goto fail;
#if 0
grub_dprintf ("reiserfs",
"%04x %04x %04x %04x %08x %08x | %08x %08x %08x %08x\n",
grub_le_to_cpu16 (entry_v1_stat.mode),
grub_le_to_cpu16 (entry_v1_stat.hardlink_count),
grub_le_to_cpu16 (entry_v1_stat.uid),
grub_le_to_cpu16 (entry_v1_stat.gid),
grub_le_to_cpu32 (entry_v1_stat.size),
grub_le_to_cpu32 (entry_v1_stat.atime),
grub_le_to_cpu32 (entry_v1_stat.mtime),
grub_le_to_cpu32 (entry_v1_stat.ctime),
grub_le_to_cpu32 (entry_v1_stat.rdev),
grub_le_to_cpu32 (entry_v1_stat.first_direct_byte));
grub_dprintf ("reiserfs",
"%04x %04x %04x %04x %08x %08x | %08x %08x %08x %08x\n",
entry_v1_stat.mode,
entry_v1_stat.hardlink_count,
entry_v1_stat.uid,
entry_v1_stat.gid,
entry_v1_stat.size,
entry_v1_stat.atime,
entry_v1_stat.mtime,
entry_v1_stat.ctime,
entry_v1_stat.rdev,
entry_v1_stat.first_direct_byte);
#endif
if ((grub_le_to_cpu16 (entry_v1_stat.mode) & S_IFLNK)
== S_IFLNK)
entry_type = GRUB_FSHELP_SYMLINK;
else
entry_type = GRUB_FSHELP_REG;
}
else
{
struct grub_reiserfs_stat_item_v2 entry_v2_stat;
grub_disk_read (data->disk,
((grub_disk_addr_t) entry_block_number * block_size) >> GRUB_DISK_SECTOR_BITS,
grub_le_to_cpu16 (entry_item->header.item_location),
sizeof (entry_v2_stat),
(char *) &entry_v2_stat);
if (grub_errno)
goto fail;
#if 0
grub_dprintf ("reiserfs",
"%04x %04x %08x %08x%08x | %08x %08x %08x %08x | %08x %08x %08x\n",
grub_le_to_cpu16 (entry_v2_stat.mode),
grub_le_to_cpu16 (entry_v2_stat.reserved),
grub_le_to_cpu32 (entry_v2_stat.hardlink_count),
(unsigned int) (grub_le_to_cpu64 (entry_v2_stat.size) >> 32),
(unsigned int) (grub_le_to_cpu64 (entry_v2_stat.size) && 0xFFFFFFFF),
grub_le_to_cpu32 (entry_v2_stat.uid),
grub_le_to_cpu32 (entry_v2_stat.gid),
grub_le_to_cpu32 (entry_v2_stat.atime),
grub_le_to_cpu32 (entry_v2_stat.mtime),
grub_le_to_cpu32 (entry_v2_stat.ctime),
grub_le_to_cpu32 (entry_v2_stat.blocks),
grub_le_to_cpu32 (entry_v2_stat.first_direct_byte));
grub_dprintf ("reiserfs",
"%04x %04x %08x %08x%08x | %08x %08x %08x %08x | %08x %08x %08x\n",
entry_v2_stat.mode,
entry_v2_stat.reserved,
entry_v2_stat.hardlink_count,
(unsigned int) (entry_v2_stat.size >> 32),
(unsigned int) (entry_v2_stat.size && 0xFFFFFFFF),
entry_v2_stat.uid,
entry_v2_stat.gid,
entry_v2_stat.atime,
entry_v2_stat.mtime,
entry_v2_stat.ctime,
entry_v2_stat.blocks,
entry_v2_stat.first_direct_byte);
#endif
if ((grub_le_to_cpu16 (entry_v2_stat.mode) & S_IFLNK)
== S_IFLNK)
entry_type = GRUB_FSHELP_SYMLINK;
else
entry_type = GRUB_FSHELP_REG;
}
}
else
{
/* Pseudo file ".." never has stat block. */
if (grub_strcmp (entry_name, ".."))
grub_dprintf ("reiserfs",
"Warning : %s has no stat block !\n",
entry_name);
grub_free (entry_item);
continue;
}
}
if (hook (entry_name, entry_type, entry_item))
{
grub_dprintf ("reiserfs", "Found : %s, type=%d\n",
entry_name, entry_type);
ret = 1;
goto found;
}
*entry_name = 0; /* Make sure next entry name (which is just
before this one in disk order) stops before
the current one. */
}
}
key_offset
= grub_reiserfs_get_key_offset (&(item_headers[block_position].key));
grub_reiserfs_set_key_offset (&(item_headers[block_position].key),
key_offset + 1);
if (grub_reiserfs_get_item (data, &(item_headers[block_position].key),
&directory_item) != GRUB_ERR_NONE)
goto fail;
block_number = directory_item.block_number;
block_position = directory_item.block_position;
}
while (block_number);
found:
assert (grub_errno == GRUB_ERR_NONE);
grub_free (block_header);
return ret;
fail:
assert (grub_errno != GRUB_ERR_NONE);
grub_free (block_header);
return 0;
}
/****************************************************************************/
/* grub api functions */
/****************************************************************************/
/* Open a file named NAME and initialize FILE. */
static grub_err_t
grub_reiserfs_open (struct grub_file *file, const char *name)
{
struct grub_reiserfs_data *data = 0;
struct grub_fshelp_node root, *found = 0, info;
struct grub_reiserfs_key key;
grub_uint32_t block_number;
grub_uint16_t entry_version, block_size, entry_location;
#ifndef GRUB_UTIL
grub_dl_ref (my_mod);
#endif
data = grub_reiserfs_mount (file->device->disk);
if (! data)
goto fail;
block_size = grub_le_to_cpu16 (data->superblock.block_size);
key.directory_id = grub_cpu_to_le32 (1);
key.object_id = grub_cpu_to_le32 (2);
key.u.v2.offset_type = 0;
grub_reiserfs_set_key_type (&key, GRUB_REISERFS_DIRECTORY, 2);
grub_reiserfs_set_key_offset (&key, 1);
if (grub_reiserfs_get_item (data, &key, &root) != GRUB_ERR_NONE)
goto fail;
if (root.block_number == 0)
{
grub_error (GRUB_ERR_BAD_FS, "Unable to find root item");
goto fail; /* Should never happen since checked at mount. */
}
grub_fshelp_find_file (name, &root, &found,
grub_reiserfs_iterate_dir,
grub_reiserfs_read_symlink, GRUB_FSHELP_REG);
if (grub_errno)
goto fail;
key.directory_id = found->header.key.directory_id;
key.object_id = found->header.key.object_id;
grub_reiserfs_set_key_type (&key, GRUB_REISERFS_STAT, 2);
grub_reiserfs_set_key_offset (&key, 0);
if (grub_reiserfs_get_item (data, &key, &info) != GRUB_ERR_NONE)
goto fail;
if (info.block_number == 0)
{
grub_error (GRUB_ERR_BAD_FS, "Unable to find searched item");
goto fail;
}
entry_version = grub_le_to_cpu16 (info.header.version);
entry_location = grub_le_to_cpu16 (info.header.item_location);
block_number = info.block_number;
if (entry_version == 0) /* Version 1 stat item. */
{
struct grub_reiserfs_stat_item_v1 entry_v1_stat;
grub_disk_read (data->disk,
(((grub_disk_addr_t) block_number * block_size)
>> GRUB_DISK_SECTOR_BITS),
entry_location
+ (((grub_off_t) block_number * block_size)
& (GRUB_DISK_SECTOR_SIZE - 1)),
sizeof (entry_v1_stat), (char *) &entry_v1_stat);
if (grub_errno)
goto fail;
file->size = (grub_off_t) grub_le_to_cpu64 (entry_v1_stat.size);
}
else
{
struct grub_reiserfs_stat_item_v2 entry_v2_stat;
grub_disk_read (data->disk,
(((grub_disk_addr_t) block_number * block_size)
>> GRUB_DISK_SECTOR_BITS),
entry_location
+ (((grub_off_t) block_number * block_size)
& (GRUB_DISK_SECTOR_SIZE - 1)),
sizeof (entry_v2_stat), (char *) &entry_v2_stat);
if (grub_errno)
goto fail;
file->size = (grub_off_t) grub_le_to_cpu64 (entry_v2_stat.size);
}
grub_dprintf ("reiserfs", "file size : %d (%08x%08x)\n",
(unsigned int) file->size,
(unsigned int) (file->size >> 32), (unsigned int) file->size);
file->offset = 0;
file->data = found;
return GRUB_ERR_NONE;
fail:
assert (grub_errno != GRUB_ERR_NONE);
grub_free (found);
grub_free (data);
#ifndef GRUB_UTIL
grub_dl_unref (my_mod);
#endif
return grub_errno;
}
static grub_ssize_t
grub_reiserfs_read (grub_file_t file, char *buf, grub_size_t len)
{
unsigned int indirect_block, indirect_block_count;
struct grub_reiserfs_key key;
struct grub_fshelp_node *node = file->data;
struct grub_reiserfs_data *data = node->data;
struct grub_fshelp_node found;
grub_uint16_t block_size = grub_le_to_cpu16 (data->superblock.block_size);
grub_uint16_t item_size;
grub_uint32_t *indirect_block_ptr = 0;
grub_uint64_t current_key_offset = 1;
grub_size_t initial_position, current_position, final_position, length;
grub_disk_addr_t block;
grub_off_t offset;
if (file->offset >= file->size)
return 0;
key.directory_id = node->header.key.directory_id;
key.object_id = node->header.key.object_id;
key.u.v2.offset_type = 0;
grub_reiserfs_set_key_type (&key, GRUB_REISERFS_ANY, 2);
initial_position = file->offset;
current_position = 0;
final_position = MIN (len + initial_position, file->size);
grub_dprintf ("reiserfs",
"Reading from %d to %d (%d instead of requested %d)\n",
initial_position, final_position,
final_position - initial_position, len);
while (current_position < final_position)
{
grub_reiserfs_set_key_offset (&key, current_key_offset);
if (grub_reiserfs_get_item (data, &key, &found) != GRUB_ERR_NONE)
goto fail;
if (found.block_number == 0)
goto fail;
item_size = grub_le_to_cpu16 (found.header.item_size);
switch (found.type)
{
case GRUB_REISERFS_DIRECT:
block = (((grub_disk_addr_t) found.block_number * block_size)
>> GRUB_DISK_SECTOR_BITS);
grub_dprintf ("reiserfs_blocktype", "D: %u\n", (unsigned) block);
if (initial_position < current_position + item_size)
{
offset = MAX ((signed) (initial_position - current_position), 0);
length = (MIN (item_size, final_position - current_position)
- offset);
grub_dprintf ("reiserfs",
"Reading direct block %u from %u to %u...\n",
(unsigned) block, (unsigned) offset,
(unsigned) offset + length);
found.data->disk->read_hook = file->read_hook;
grub_disk_read (found.data->disk,
block,
offset
+ grub_le_to_cpu16 (found.header.item_location),
length, buf);
found.data->disk->read_hook = 0;
if (grub_errno)
goto fail;
buf += length;
current_position += offset + length;
}
else
current_position += item_size;
break;
case GRUB_REISERFS_INDIRECT:
indirect_block_count = item_size / sizeof (*indirect_block_ptr);
indirect_block_ptr = grub_malloc (item_size);
if (! indirect_block_ptr)
goto fail;
grub_disk_read (found.data->disk,
(((grub_disk_addr_t) found.block_number * block_size)
>> GRUB_DISK_SECTOR_BITS),
grub_le_to_cpu16 (found.header.item_location),
item_size, (char *) indirect_block_ptr);
if (grub_errno)
goto fail;
found.data->disk->read_hook = file->read_hook;
for (indirect_block = 0;
indirect_block < indirect_block_count
&& current_position < final_position;
indirect_block++)
{
block = ((grub_disk_addr_t)
grub_le_to_cpu32 (indirect_block_ptr[indirect_block])
* block_size) >> GRUB_DISK_SECTOR_BITS;
grub_dprintf ("reiserfs_blocktype", "I: %u\n", (unsigned) block);
if (current_position + block_size >= initial_position)
{
offset = MAX ((signed) (initial_position - current_position),
0);
length = (MIN (block_size, final_position - current_position)
- offset);
grub_dprintf ("reiserfs",
"Reading indirect block %u from %u to %u...\n",
(unsigned) block, (unsigned) offset,
(unsigned) offset + length);
#if 0
grub_dprintf ("reiserfs",
"\nib=%04d/%04d, ip=%d, cp=%d, fp=%d, off=%d, l=%d, tl=%d\n",
indirect_block + 1, indirect_block_count,
initial_position, current_position,
final_position, offset, length, len);
#endif
grub_disk_read (found.data->disk, block, offset, length, buf);
if (grub_errno)
goto fail;
buf += length;
current_position += offset + length;
}
else
current_position += block_size;
}
found.data->disk->read_hook = 0;
grub_free (indirect_block_ptr);
indirect_block_ptr = 0;
break;
default:
goto fail;
}
current_key_offset = current_position + 1;
}
grub_dprintf("reiserfs",
"Have successfully read %d bytes (%d requested)\n",
current_position - initial_position, len);
return current_position - initial_position;
/*
switch (found.type)
{
case GRUB_REISERFS_DIRECT:
read_length = MIN (len, item_size - file->offset);
grub_disk_read (found.data->disk,
(found.block_number * block_size) / GRUB_DISK_SECTOR_SIZE,
grub_le_to_cpu16 (found.header.item_location) + file->offset,
read_length, buf);
if (grub_errno)
goto fail;
break;
case GRUB_REISERFS_INDIRECT:
indirect_block_count = item_size / sizeof (*indirect_block_ptr);
indirect_block_ptr = grub_malloc (item_size);
if (!indirect_block_ptr)
goto fail;
grub_disk_read (found.data->disk,
(found.block_number * block_size) / GRUB_DISK_SECTOR_SIZE,
grub_le_to_cpu16 (found.header.item_location),
item_size, (char *) indirect_block_ptr);
if (grub_errno)
goto fail;
len = MIN (len, file->size - file->offset);
for (indirect_block = file->offset / block_size;
indirect_block < indirect_block_count && read_length < len;
indirect_block++)
{
read = MIN (block_size, len - read_length);
grub_disk_read (found.data->disk,
(grub_le_to_cpu32 (indirect_block_ptr[indirect_block]) * block_size) / GRUB_DISK_SECTOR_SIZE,
file->offset % block_size, read,
((void *) buf) + read_length);
if (grub_errno)
goto fail;
read_length += read;
}
grub_free (indirect_block_ptr);
break;
default:
goto fail;
}
return read_length;*/
fail:
grub_free (indirect_block_ptr);
return 0;
}
/* Close the file FILE. */
static grub_err_t
grub_reiserfs_close (grub_file_t file)
{
struct grub_fshelp_node *node = file->data;
struct grub_reiserfs_data *data = node->data;
grub_free (data);
grub_free (node);
#ifndef GRUB_UTIL
grub_dl_unref (my_mod);
#endif
return GRUB_ERR_NONE;
}
/* Call HOOK with each file under DIR. */
static grub_err_t
grub_reiserfs_dir (grub_device_t device, const char *path,
int (*hook) (const char *filename, int dir))
{
struct grub_reiserfs_data *data = 0;
struct grub_fshelp_node root, *found;
struct grub_reiserfs_key root_key;
auto int NESTED_FUNC_ATTR iterate (const char *filename,
enum grub_fshelp_filetype filetype,
grub_fshelp_node_t node);
int NESTED_FUNC_ATTR iterate (const char *filename,
enum grub_fshelp_filetype filetype,
grub_fshelp_node_t node)
{
grub_free (node);
if (filetype == GRUB_FSHELP_DIR)
return hook (filename, 1);
else
return hook (filename, 0);
}
#ifndef GRUB_UTIL
grub_dl_ref (my_mod);
#endif
data = grub_reiserfs_mount (device->disk);
if (! data)
goto fail;
root_key.directory_id = grub_cpu_to_le32 (1);
root_key.object_id = grub_cpu_to_le32 (2);
root_key.u.v2.offset_type = 0;
grub_reiserfs_set_key_type (&root_key, GRUB_REISERFS_DIRECTORY, 2);
grub_reiserfs_set_key_offset (&root_key, 1);
if (grub_reiserfs_get_item (data, &root_key, &root) != GRUB_ERR_NONE)
goto fail;
if (root.block_number == 0)
{
grub_error(GRUB_ERR_BAD_FS, "Root not found");
goto fail;
}
grub_fshelp_find_file (path, &root, &found, grub_reiserfs_iterate_dir,
grub_reiserfs_read_symlink, GRUB_FSHELP_DIR);
if (grub_errno)
goto fail;
grub_reiserfs_iterate_dir (found, iterate);
grub_free (data);
#ifndef GRUB_UTIL
grub_dl_unref (my_mod);
#endif
return GRUB_ERR_NONE;
fail:
grub_free (data);
#ifndef GRUB_UTIL
grub_dl_unref (my_mod);
#endif
return grub_errno;
}
/* Return the label of the device DEVICE in LABEL. The label is
returned in a grub_malloc'ed buffer and should be freed by the
caller. */
static grub_err_t
grub_reiserfs_label (grub_device_t device, char **label)
{
*label = grub_malloc (REISERFS_MAX_LABEL_LENGTH);
if (*label)
{
grub_disk_read (device->disk,
REISERFS_SUPER_BLOCK_OFFSET / GRUB_DISK_SECTOR_SIZE,
REISERFS_LABEL_OFFSET, REISERFS_MAX_LABEL_LENGTH,
*label);
}
return grub_errno;
}
static struct grub_fs grub_reiserfs_fs =
{
.name = "reiserfs",
.dir = grub_reiserfs_dir,
.open = grub_reiserfs_open,
.read = grub_reiserfs_read,
.close = grub_reiserfs_close,
.label = grub_reiserfs_label,
.next = 0
};
GRUB_MOD_INIT(reiserfs)
{
grub_fs_register (&grub_reiserfs_fs);
#ifndef GRUB_UTIL
my_mod = mod;
#endif
}
GRUB_MOD_FINI(reiserfs)
{
grub_fs_unregister (&grub_reiserfs_fs);
}
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