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