+++ /dev/null
-/*
- * 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;
-}
projects / reactos.git / blobdiff