/*
* PROJECT: Mke2fs
* FILE: Super.c
* PROGRAMMER: Matt Wu <mattwu@163.com>
* HOMEPAGE: http://ext2.yeah.net
*/
/* INCLUDES **************************************************************/
#include "Mke2fs.h"
#include <debug.h>
/* DEFINITIONS ***********************************************************/
extern int inode_ratio;
/* FUNCTIONS *************************************************************/
void ext2_print_super(PEXT2_SUPER_BLOCK pExt2Sb)
{
int i;
DPRINT("\nExt2 Super Block Details ...\n\n");
DPRINT(" Inode Count: %lu\n", pExt2Sb->s_inodes_count);
DPRINT(" Block Count: %lu\n", pExt2Sb->s_blocks_count);
DPRINT(" Reserved Block Count: %lu\n", pExt2Sb->s_r_blocks_count);
DPRINT(" Free Blocks: %lu\n", pExt2Sb->s_free_blocks_count);
DPRINT(" Free Inodes: %lu\n", pExt2Sb->s_free_inodes_count);
DPRINT(" First Data Block: %lu\n", pExt2Sb->s_first_data_block);
DPRINT(" Log Block Size: %lu\n", pExt2Sb->s_log_block_size);
DPRINT(" Log Frag Size: %ld\n", pExt2Sb->s_log_frag_size);
DPRINT(" Blocks per Group: %lu\n", pExt2Sb->s_blocks_per_group);
DPRINT(" Fragments per Group: %lu\n", pExt2Sb->s_frags_per_group);
DPRINT(" Inodes per Group: %lu\n", pExt2Sb->s_inodes_per_group);
// DPRINT(" Mount Time: %s", ctime((time_t *) & (pExt2Sb->s_mtime)));
// DPRINT(" Write Time: %s", ctime((time_t *) & (pExt2Sb->s_wtime)));
DPRINT(" Mount Count: %u\n", pExt2Sb->s_mnt_count);
DPRINT(" Max Mount Count: %d\n", pExt2Sb->s_max_mnt_count);
DPRINT(" Magic Number: %X (%s)\n", pExt2Sb->s_magic,
pExt2Sb->s_magic == EXT2_SUPER_MAGIC ? "OK" : "BAD");
DPRINT(" File System State: %X\n", pExt2Sb->s_state);
DPRINT(" Error Behaviour: %X\n", pExt2Sb->s_errors);
DPRINT(" Minor rev: %u\n", pExt2Sb->s_minor_rev_level);
// DPRINT(" Last Check: %s", ctime((time_t *) & (pExt2Sb->s_lastcheck)));
DPRINT(" Check Interval: %lu\n", pExt2Sb->s_checkinterval);
DPRINT(" Creator OS: %lu\n", pExt2Sb->s_creator_os);
DPRINT(" Revision Level: %lu\n", pExt2Sb->s_rev_level);
DPRINT(" Reserved Block Default UID: %u\n", pExt2Sb->s_def_resuid);
DPRINT(" Reserved Block Default GID: %u\n", pExt2Sb->s_def_resgid);
DPRINT(" uuid = ");
for (i=0; i < 16; i++)
DbgPrint("%x ", pExt2Sb->s_uuid[i]);
DbgPrint("\n");
DPRINT(" volume label name: ");
for (i=0; i < 16; i++)
{
if (pExt2Sb->s_volume_name[i] == 0)
break;
DbgPrint("%c", pExt2Sb->s_volume_name[i]);
}
DbgPrint("\n");
DPRINT("\n\n");
}
#define set_field(field, default) if (!pExt2Sb->field) pExt2Sb->field = (default);
/*
* Initialize super block ...
*/
bool ext2_initialize_sb(PEXT2_FILESYS Ext2Sys)
{
int frags_per_block = 0;
ULONG overhead = 0;
ULONG rem = 0;
ULONG i = 0;
ULONG group_block = 0;
ULONG numblocks = 0;
PEXT2_SUPER_BLOCK pExt2Sb = Ext2Sys->ext2_sb;
LARGE_INTEGER SysTime;
NtQuerySystemTime(&SysTime);
Ext2Sys->blocksize = EXT2_BLOCK_SIZE(pExt2Sb);
Ext2Sys->fragsize = EXT2_FRAG_SIZE(pExt2Sb);
frags_per_block = Ext2Sys->blocksize / Ext2Sys->fragsize;
pExt2Sb->s_magic = EXT2_SUPER_MAGIC;
pExt2Sb->s_state = EXT2_VALID_FS;
pExt2Sb->s_first_data_block = (pExt2Sb->s_log_block_size) ? 0 : 1;
pExt2Sb->s_max_mnt_count = EXT2_DFL_MAX_MNT_COUNT;
pExt2Sb->s_errors = EXT2_ERRORS_DEFAULT;
pExt2Sb->s_checkinterval = EXT2_DFL_CHECKINTERVAL;
if (!pExt2Sb->s_rev_level)
pExt2Sb->s_rev_level = EXT2_GOOD_OLD_REV;
if (pExt2Sb->s_rev_level >= EXT2_DYNAMIC_REV)
{
set_field(s_first_ino, EXT2_GOOD_OLD_FIRST_INO);
set_field(s_inode_size, EXT2_GOOD_OLD_INODE_SIZE);
}
RtlTimeToSecondsSince1970(&SysTime, &pExt2Sb->s_wtime);
pExt2Sb->s_lastcheck = pExt2Sb->s_mtime = pExt2Sb->s_wtime;
if (!pExt2Sb->s_blocks_per_group)
pExt2Sb->s_blocks_per_group = Ext2Sys->blocksize * 8;
pExt2Sb->s_frags_per_group = pExt2Sb->s_blocks_per_group * frags_per_block;
pExt2Sb->s_creator_os = EXT2_OS_WINNT;
if (pExt2Sb->s_r_blocks_count >= pExt2Sb->s_blocks_count)
{
goto cleanup;
}
/*
* If we're creating an external journal device, we don't need
* to bother with the rest.
*/
if (pExt2Sb->s_feature_incompat &
EXT3_FEATURE_INCOMPAT_JOURNAL_DEV)
{
Ext2Sys->group_desc_count = 0;
// ext2fs_mark_super_dirty(fs);
return true;
}
retry:
Ext2Sys->group_desc_count = (pExt2Sb->s_blocks_count - pExt2Sb->s_first_data_block
+ EXT2_BLOCKS_PER_GROUP(pExt2Sb) - 1) / EXT2_BLOCKS_PER_GROUP(pExt2Sb);
if (Ext2Sys->group_desc_count == 0)
return false;
Ext2Sys->desc_blocks = (Ext2Sys->group_desc_count + EXT2_DESC_PER_BLOCK(pExt2Sb)
- 1) / EXT2_DESC_PER_BLOCK(pExt2Sb);
if (!pExt2Sb->s_inodes_count)
pExt2Sb->s_inodes_count = pExt2Sb->s_blocks_count / ( inode_ratio /Ext2Sys->blocksize);
/*
* Make sure we have at least EXT2_FIRST_INO + 1 inodes, so
* that we have enough inodes for the filesystem(!)
*/
if (pExt2Sb->s_inodes_count < EXT2_FIRST_INODE(pExt2Sb)+1)
pExt2Sb->s_inodes_count = EXT2_FIRST_INODE(pExt2Sb)+1;
/*
* There should be at least as many inodes as the user
* requested. Figure out how many inodes per group that
* should be. But make sure that we don't allocate more than
* one bitmap's worth of inodes
*/
pExt2Sb->s_inodes_per_group = (pExt2Sb->s_inodes_count + Ext2Sys->group_desc_count - 1)
/Ext2Sys->group_desc_count;
if (pExt2Sb->s_inodes_per_group > (ULONG)(Ext2Sys->blocksize*8))
pExt2Sb->s_inodes_per_group = Ext2Sys->blocksize*8;
/*
* Make sure the number of inodes per group completely fills
* the inode table blocks in the descriptor. If not, add some
* additional inodes/group. Waste not, want not...
*/
Ext2Sys->inode_blocks_per_group = (((pExt2Sb->s_inodes_per_group * EXT2_INODE_SIZE(pExt2Sb))
+ EXT2_BLOCK_SIZE(pExt2Sb) - 1) / EXT2_BLOCK_SIZE(pExt2Sb));
pExt2Sb->s_inodes_per_group = ((Ext2Sys->inode_blocks_per_group * EXT2_BLOCK_SIZE(pExt2Sb))
/ EXT2_INODE_SIZE(pExt2Sb));
/*
* Finally, make sure the number of inodes per group is a
* multiple of 8. This is needed to simplify the bitmap
* splicing code.
*/
pExt2Sb->s_inodes_per_group &= ~7;
Ext2Sys->inode_blocks_per_group = (((pExt2Sb->s_inodes_per_group * EXT2_INODE_SIZE(pExt2Sb))
+ EXT2_BLOCK_SIZE(pExt2Sb) - 1) / EXT2_BLOCK_SIZE(pExt2Sb));
/*
* adjust inode count to reflect the adjusted inodes_per_group
*/
pExt2Sb->s_inodes_count = pExt2Sb->s_inodes_per_group * Ext2Sys->group_desc_count;
pExt2Sb->s_free_inodes_count = pExt2Sb->s_inodes_count;
/*
* Overhead is the number of bookkeeping blocks per group. It
* includes the superblock backup, the group descriptor
* backups, the inode bitmap, the block bitmap, and the inode
* table.
*
* XXX Not all block groups need the descriptor blocks, but
* being clever is tricky...
*/
overhead = (3 + Ext2Sys->desc_blocks + Ext2Sys->inode_blocks_per_group);
/*
* See if the last group is big enough to support the
* necessary data structures. If not, we need to get rid of
* it.
*/
rem = ((pExt2Sb->s_blocks_count - pExt2Sb->s_first_data_block) %
pExt2Sb->s_blocks_per_group);
if ((Ext2Sys->group_desc_count == 1) && rem && (rem < overhead))
return false;
if (rem && (rem < overhead+50))
{
pExt2Sb->s_blocks_count -= rem;
goto retry;
}
/*
* At this point we know how big the filesystem will be. So we can do
* any and all allocations that depend on the block count.
*/
// Allocate block bitmap
if(!ext2_allocate_block_bitmap(Ext2Sys))
{
goto cleanup;
}
// Allocate inode bitmap
if(!ext2_allocate_inode_bitmap(Ext2Sys))
{
goto cleanup;
}
// Allocate gourp desc
if(!ext2_allocate_group_desc(Ext2Sys))
{
goto cleanup;
}
/*
* Reserve the superblock and group descriptors for each
* group, and fill in the correct group statistics for group.
* Note that although the block bitmap, inode bitmap, and
* inode table have not been allocated (and in fact won't be
* by this routine), they are accounted for nevertheless.
*/
group_block = pExt2Sb->s_first_data_block;
numblocks = 0;
pExt2Sb->s_free_blocks_count = 0;
for (i = 0; i < Ext2Sys->group_desc_count; i++)
{
if (i == Ext2Sys->group_desc_count-1)
{
numblocks = (pExt2Sb->s_blocks_count - pExt2Sb->s_first_data_block)
% pExt2Sb->s_blocks_per_group;
if (!numblocks)
numblocks = pExt2Sb->s_blocks_per_group;
}
else
{
numblocks = pExt2Sb->s_blocks_per_group;
}
if (ext2_bg_has_super(pExt2Sb, i))
{
ULONG j;
for (j=0; j < Ext2Sys->desc_blocks+1; j++)
ext2_mark_bitmap(Ext2Sys->block_map, group_block + j);
numblocks -= 1 + Ext2Sys->desc_blocks;
}
numblocks -= 2 + Ext2Sys->inode_blocks_per_group;
pExt2Sb->s_free_blocks_count += numblocks;
Ext2Sys->group_desc[i].bg_free_blocks_count = (__u16)numblocks;
Ext2Sys->group_desc[i].bg_free_inodes_count = (__u16)pExt2Sb->s_inodes_per_group;
Ext2Sys->group_desc[i].bg_used_dirs_count = 0;
group_block += pExt2Sb->s_blocks_per_group;
}
return true;
cleanup:
ext2_free_group_desc(Ext2Sys);
ext2_free_block_bitmap(Ext2Sys);
ext2_free_inode_bitmap(Ext2Sys);
return false;
}