mirror of
https://github.com/reactos/reactos.git
synced 2024-07-05 20:25:17 +00:00
696 lines
16 KiB
C
696 lines
16 KiB
C
/*
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* PROJECT: Mke2fs
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* FILE: Inode.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 char *device_name;
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/* FUNCTIONS *************************************************************/
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bool ext2_get_inode_lba(PEXT2_FILESYS Ext2Sys, ULONG no, LONGLONG *offset)
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{
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LONGLONG loc = 0;
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PEXT2_SUPER_BLOCK pExt2Sb = Ext2Sys->ext2_sb;
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if (no < 1 || no > pExt2Sb->s_inodes_count)
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{
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DPRINT1("Mke2fs: Inode value %lu was out of range in load_inode.(1-%ld)\n",
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no, pExt2Sb->s_inodes_count);
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*offset = 0;
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return false;
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}
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loc = (LONGLONG)(Ext2Sys->blocksize) * Ext2Sys->group_desc[(no - 1) / pExt2Sb->s_inodes_per_group].bg_inode_table +
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((no - 1) % pExt2Sb->s_inodes_per_group) * sizeof(EXT2_INODE);
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*offset = loc;
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return true;
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}
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bool ext2_load_inode(PEXT2_FILESYS Ext2Sys, ULONG no, PEXT2_INODE pInode)
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{
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LONGLONG Offset;
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bool bRet = false;
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if (ext2_get_inode_lba(Ext2Sys, no, &Offset))
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{
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bRet = NT_SUCCESS(Ext2ReadDisk(
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Ext2Sys,
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Offset,
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sizeof(EXT2_INODE),
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(unsigned char *)pInode));
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}
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return bRet;
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}
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bool ext2_save_inode(PEXT2_FILESYS Ext2Sys, ULONG no, PEXT2_INODE pInode)
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{
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LONGLONG offset;
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bool bRet = false;
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if (ext2_get_inode_lba(Ext2Sys, no, &offset))
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{
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bRet = NT_SUCCESS(Ext2WriteDisk(
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Ext2Sys,
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offset,
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sizeof(EXT2_INODE),
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(unsigned char *)pInode));
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}
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return bRet;
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}
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/*
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* Right now, just search forward from the parent directory's block
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* group to find the next free inode.
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*
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* Should have a special policy for directories.
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*/
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bool ext2_new_inode(PEXT2_FILESYS fs, ULONG dir, int mode,
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PEXT2_INODE_BITMAP map, ULONG *ret)
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{
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ULONG dir_group = 0;
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ULONG i;
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ULONG start_inode;
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if (!map)
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map = fs->inode_map;
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if (!map)
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return false;
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if (dir > 0)
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dir_group = (dir - 1) / EXT2_INODES_PER_GROUP(fs->ext2_sb);
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start_inode = (dir_group * EXT2_INODES_PER_GROUP(fs->ext2_sb)) + 1;
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if (start_inode < EXT2_FIRST_INODE(fs->ext2_sb))
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start_inode = EXT2_FIRST_INODE(fs->ext2_sb);
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i = start_inode;
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do
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{
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if (!ext2_test_inode_bitmap(map, i))
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break;
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i++;
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if (i > fs->ext2_sb->s_inodes_count)
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i = EXT2_FIRST_INODE(fs->ext2_sb);
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} while (i != start_inode);
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if (ext2_test_inode_bitmap(map, i))
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return false;
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*ret = i;
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return true;
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}
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bool ext2_expand_block( PEXT2_FILESYS Ext2Sys, PEXT2_INODE Inode,
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ULONG dwContent, ULONG Index, int layer,
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ULONG newBlk, ULONG *dwRet, ULONG *off )
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{
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ULONG *pData = NULL;
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ULONG i = 0, j = 0, temp = 1;
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ULONG dwBlk;
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ULONG dwNewBlk = newBlk;
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bool bDirty = false;
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bool bRet = true;
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ULONG Offset = 0;
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PEXT2_SUPER_BLOCK pExt2Sb = Ext2Sys->ext2_sb;
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pData = (ULONG *)RtlAllocateHeap(RtlGetProcessHeap(), 0, Ext2Sys->blocksize);
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if (!pData)
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{
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bRet = false;
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goto errorout;
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}
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if (!ext2_read_block(Ext2Sys, dwContent, (void *)pData))
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{
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bRet = false;
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goto errorout;
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}
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if (layer == 1)
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{
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*dwRet = dwContent;
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*off = Index;
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pData[Index] = newBlk;
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bDirty = TRUE;
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}
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else if (layer <= 3)
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{
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temp = 1 << ((10 + pExt2Sb->s_log_block_size - 2) * (layer - 1));
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i = Index / temp;
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j = Index % temp;
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dwBlk = pData[i];
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if (dwBlk == 0)
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{
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if (ext2_alloc_block(Ext2Sys, 0, &dwBlk) )
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{
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pData[i] = dwBlk;
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bDirty = true;
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Inode->i_blocks += (Ext2Sys->blocksize / SECTOR_SIZE);
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}
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if (!bDirty)
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goto errorout;
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}
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if (!ext2_expand_block(Ext2Sys, Inode, dwBlk, j, layer - 1, bDirty, &dwNewBlk, &Offset))
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{
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bRet = false;
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DPRINT1("Mke2fs: ext2_expand_block: ... error recuise...\n");
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goto errorout;
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}
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}
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if (bDirty)
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{
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bRet = ext2_write_block(Ext2Sys, dwContent, (void *)pData);
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}
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errorout:
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if (pData)
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RtlFreeHeap(RtlGetProcessHeap(), 0, pData);
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if (bRet && dwRet)
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*dwRet = dwNewBlk;
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return bRet;
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}
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bool ext2_expand_inode( PEXT2_FILESYS Ext2Sys,
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PEXT2_INODE Inode,
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ULONG newBlk )
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{
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ULONG dwSizes[4] = {12, 1, 1, 1};
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ULONG Index = 0;
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ULONG dwTotal = 0;
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ULONG dwBlk = 0, dwNewBlk = 0, Offset = 0;
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PEXT2_SUPER_BLOCK pExt2Sb = Ext2Sys->ext2_sb;
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int i = 0;
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bool bRet = true;
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ULONG TotalBlocks;
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TotalBlocks = Inode->i_blocks / (Ext2Sys->blocksize / SECTOR_SIZE);
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Index = Ext2DataBlocks(Ext2Sys, TotalBlocks);
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for (i = 0; i < 4; i++)
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{
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dwSizes[i] = dwSizes[i] << ((10 + pExt2Sb->s_log_block_size - 2) * i);
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dwTotal += dwSizes[i];
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}
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if (Index >= dwTotal)
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{
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DPRINT1("Mke2fs: ext2_expand_inode: beyond the maxinum size of an inode.\n");
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return false;
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}
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for (i = 0; i < 4; i++)
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{
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if (Index < dwSizes[i])
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{
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if (i == 0)
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{
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Inode->i_block[Index] = newBlk;
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}
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else
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{
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dwBlk = Inode->i_block[(i + 12 - 1)];
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if (dwBlk == 0)
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{
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if (ext2_alloc_block(Ext2Sys, 0, &dwBlk))
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{
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Inode->i_block[(i + 12 - 1)] = dwBlk;
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Inode->i_blocks += (Ext2Sys->blocksize / SECTOR_SIZE);
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}
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else
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{
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break;
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}
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}
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dwNewBlk = 0;
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bRet = ext2_expand_block(
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Ext2Sys,
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Inode,
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dwBlk,
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Index,
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i,
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newBlk,
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&dwNewBlk,
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&Offset );
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}
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break;
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}
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Index -= dwSizes[i];
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}
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return bRet;
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}
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bool ext2_get_block(PEXT2_FILESYS Ext2Sys, ULONG dwContent, ULONG Index, int layer, ULONG *dwRet)
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{
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ULONG *pData = NULL;
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LONGLONG Offset = 0;
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ULONG i = 0, j = 0, temp = 1;
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ULONG dwBlk = 0;
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bool bRet = true;
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PEXT2_SUPER_BLOCK pExt2Sb = Ext2Sys->ext2_sb;
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Offset = (LONGLONG) dwContent;
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Offset = Offset * Ext2Sys->blocksize;
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pData = (ULONG *)RtlAllocateHeap(RtlGetProcessHeap(), 0, Ext2Sys->blocksize);
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if (!pData)
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{
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return false;
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}
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memset(pData, 0, Ext2Sys->blocksize);
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if (layer == 0)
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{
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dwBlk = dwContent;
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}
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else if (layer <= 3)
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{
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if (!ext2_read_block(Ext2Sys, dwContent, (void *)pData))
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{
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bRet = false;
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goto errorout;
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}
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temp = 1 << ((10 + pExt2Sb->s_log_block_size - 2) * (layer - 1));
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i = Index / temp;
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j = Index % temp;
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if (!ext2_get_block(Ext2Sys, pData[i], j, layer - 1, &dwBlk))
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{
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bRet = false;
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DPRINT1("Mke2fs: ext2_get_block: ... error recuise...\n");
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goto errorout;
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}
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}
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errorout:
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if (pData)
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RtlFreeHeap(RtlGetProcessHeap(), 0, pData);
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if (bRet && dwRet)
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*dwRet = dwBlk;
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return bRet;
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}
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bool ext2_block_map(PEXT2_FILESYS Ext2Sys, PEXT2_INODE inode, ULONG block, ULONG *dwRet)
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{
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ULONG dwSizes[4] = { 12, 1, 1, 1 };
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ULONG Index = 0;
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ULONG dwBlk = 0;
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PEXT2_SUPER_BLOCK pExt2Sb = Ext2Sys->ext2_sb;
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UINT i;
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bool bRet = false;
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Index = block;
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for (i = 0; i < 4; i++)
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{
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dwSizes[i] = dwSizes[i] << ((10 + pExt2Sb->s_log_block_size - 2) * i);
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}
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if (Index >= inode->i_blocks / (Ext2Sys->blocksize / SECTOR_SIZE))
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{
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DPRINT1("Mke2fs: ext2_block_map: beyond the size of the inode.\n");
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return false;
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}
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for (i = 0; i < 4; i++)
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{
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if (Index < dwSizes[i])
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{
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dwBlk = inode->i_block[i==0 ? (Index):(i + 12 - 1)];
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bRet = ext2_get_block(Ext2Sys, dwBlk, Index , i, &dwBlk);
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break;
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}
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Index -= dwSizes[i];
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}
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if (bRet && dwBlk)
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{
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if (dwRet)
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*dwRet = dwBlk;
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return true;
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}
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else
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return false;
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}
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ULONG ext2_build_bdl(PEXT2_FILESYS Ext2Sys,
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PEXT2_INODE ext2_inode,
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IN ULONG offset,
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IN ULONG size,
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OUT PEXT2_BDL *ext2_bdl )
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{
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ULONG nBeg, nEnd, nBlocks;
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ULONG dwBlk;
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ULONG i;
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ULONG dwBytes = 0;
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LONGLONG lba;
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PEXT2_BDL ext2bdl = NULL;
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*ext2_bdl = NULL;
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if (offset >= ext2_inode->i_size)
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{
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DPRINT1("Mke2fs: ext2_build_bdl: beyond the file range.\n");
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return 0;
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}
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/*
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if (offset + size > ext2_inode->i_size)
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{
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size = ext2_inode->i_size - offset;
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}
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*/
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nBeg = offset / Ext2Sys->blocksize;
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nEnd = (size + offset + Ext2Sys->blocksize - 1) / Ext2Sys->blocksize;
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nBlocks = nEnd - nBeg;
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if (nBlocks > 0)
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{
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ext2bdl = (PEXT2_BDL)
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RtlAllocateHeap(RtlGetProcessHeap(), 0, sizeof(EXT2_BDL) * nBlocks);
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if (ext2bdl)
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{
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memset(ext2bdl, 0, sizeof(EXT2_BDL) * nBlocks);
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for (i = nBeg; i < nEnd; i++)
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{
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if (!ext2_block_map(Ext2Sys, ext2_inode, i, &dwBlk))
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{
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goto fail;
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}
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lba = (LONGLONG) dwBlk;
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lba = lba * Ext2Sys->blocksize;
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if (nBlocks == 1) // ie. (nBeg == nEnd - 1)
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{
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dwBytes = size;
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ext2bdl[i - nBeg].Lba = lba + (LONGLONG)(offset % (Ext2Sys->blocksize));
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ext2bdl[i - nBeg].Length = dwBytes;
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ext2bdl[i - nBeg].Offset = 0;
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}
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else
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{
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if (i == nBeg)
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{
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dwBytes = Ext2Sys->blocksize - (offset % (Ext2Sys->blocksize));
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ext2bdl[i - nBeg].Lba = lba + (LONGLONG)(offset % (Ext2Sys->blocksize));
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ext2bdl[i - nBeg].Length = dwBytes;
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ext2bdl[i - nBeg].Offset = 0;
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}
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else if (i == nEnd - 1)
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{
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ext2bdl[i - nBeg].Lba = lba;
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ext2bdl[i - nBeg].Length = size - dwBytes;
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ext2bdl[i - nBeg].Offset = dwBytes;
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dwBytes = size;
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}
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else
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{
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ext2bdl[i - nBeg].Lba = lba;
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ext2bdl[i - nBeg].Length = Ext2Sys->blocksize;
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ext2bdl[i - nBeg].Offset = dwBytes;
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dwBytes += Ext2Sys->blocksize;
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}
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}
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}
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*ext2_bdl = ext2bdl;
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return nBlocks;
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}
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}
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fail:
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if (ext2bdl)
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RtlFreeHeap(RtlGetProcessHeap(), 0, ext2bdl);
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// Error
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return 0;
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}
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bool ext2_read_inode(PEXT2_FILESYS Ext2Sys,
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ULONG ino,
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ULONG offset,
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PVOID Buffer,
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ULONG size,
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PULONG dwReturn)
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{
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PEXT2_BDL ext2_bdl = NULL;
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ULONG blocks, i;
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bool bRet = true;
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EXT2_INODE ext2_inode;
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ULONG dwTotal = 0;
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if (!ext2_load_inode(Ext2Sys, ino, &ext2_inode))
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{
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return false;
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}
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blocks = ext2_build_bdl(Ext2Sys, &ext2_inode, offset, size, &ext2_bdl);
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if (blocks <= 0)
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return false;
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for(i = 0; i < blocks; i++)
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{
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bRet = NT_SUCCESS(Ext2ReadDisk(
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Ext2Sys,
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ext2_bdl[i].Lba,
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ext2_bdl[i].Length,
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(PUCHAR)Buffer + ext2_bdl[i].Offset
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));
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if (!bRet)
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break;
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dwTotal += ext2_bdl[i].Length;
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}
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*dwReturn = dwTotal;
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if (ext2_bdl)
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RtlFreeHeap(RtlGetProcessHeap(), 0, ext2_bdl);
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return bRet;
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}
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bool ext2_write_inode (PEXT2_FILESYS Ext2Sys,
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ULONG ino,
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ULONG offset,
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PVOID Buffer,
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ULONG size,
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PULONG dwReturn )
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{
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PEXT2_BDL ext2_bdl = NULL;
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ULONG blocks, i;
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bool bRet = true;
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EXT2_INODE inode;
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ULONG dwTotal = 0;
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ULONG dwBlk = 0;
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ULONG TotalBlks;
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blocks = (size + offset + Ext2Sys->blocksize - 1) / Ext2Sys->blocksize;
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if (!ext2_load_inode(Ext2Sys, ino, &inode))
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{
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return false;
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}
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TotalBlks = inode.i_blocks / (Ext2Sys->blocksize / SECTOR_SIZE);
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TotalBlks = Ext2DataBlocks(Ext2Sys, TotalBlks);
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if (blocks > TotalBlks)
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{
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for (i=0; i < (blocks - TotalBlks); i++)
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|
{
|
|
if (ext2_alloc_block(Ext2Sys, 0, &dwBlk) )
|
|
{
|
|
ext2_expand_inode(Ext2Sys, &inode, dwBlk);
|
|
inode.i_blocks += (Ext2Sys->blocksize/SECTOR_SIZE);
|
|
}
|
|
}
|
|
}
|
|
|
|
blocks = ext2_build_bdl(Ext2Sys, &inode, offset, size, &ext2_bdl);
|
|
|
|
if (blocks <= 0)
|
|
return false;
|
|
|
|
for(i = 0; i < blocks; i++)
|
|
{
|
|
bRet = NT_SUCCESS(Ext2WriteDisk(
|
|
Ext2Sys,
|
|
ext2_bdl[i].Lba,
|
|
ext2_bdl[i].Length,
|
|
(PUCHAR)Buffer + ext2_bdl[i].Offset
|
|
));
|
|
|
|
if (!bRet)
|
|
{
|
|
goto errorout;
|
|
}
|
|
|
|
dwTotal += ext2_bdl[i].Length;
|
|
}
|
|
|
|
*dwReturn = dwTotal;
|
|
|
|
if (size + offset > inode.i_size)
|
|
{
|
|
inode.i_size = size + offset;
|
|
}
|
|
|
|
ext2_save_inode(Ext2Sys, ino, &inode);
|
|
|
|
|
|
errorout:
|
|
|
|
if (ext2_bdl)
|
|
RtlFreeHeap(RtlGetProcessHeap(), 0, ext2_bdl);
|
|
|
|
return bRet;
|
|
}
|
|
|
|
bool
|
|
ext2_add_entry( PEXT2_FILESYS Ext2Sys,
|
|
ULONG parent, ULONG inode,
|
|
int filetype, char *name )
|
|
{
|
|
PEXT2_DIR_ENTRY2 dir = NULL, newdir = NULL;
|
|
EXT2_INODE parent_inode;
|
|
ULONG dwRet;
|
|
char *buf;
|
|
int rec_len;
|
|
bool bRet = false;
|
|
|
|
rec_len = EXT2_DIR_REC_LEN(strlen(name));
|
|
|
|
if (!ext2_load_inode(Ext2Sys, parent, &parent_inode))
|
|
{
|
|
return false;
|
|
}
|
|
|
|
buf = (char *)RtlAllocateHeap(RtlGetProcessHeap(), 0, parent_inode.i_size);
|
|
|
|
if (!ext2_read_inode(Ext2Sys, parent, 0, buf, parent_inode.i_size, &dwRet))
|
|
{
|
|
return false;
|
|
}
|
|
|
|
dir = (PEXT2_DIR_ENTRY2) buf;
|
|
|
|
while ((char *)dir < buf + parent_inode.i_size)
|
|
{
|
|
if ((dir->inode == 0 && dir->rec_len >= rec_len) ||
|
|
(dir->rec_len >= dir->name_len + rec_len) )
|
|
{
|
|
if (dir->inode)
|
|
{
|
|
newdir = (PEXT2_DIR_ENTRY2) ((PUCHAR)dir + EXT2_DIR_REC_LEN(dir->name_len));
|
|
newdir->rec_len = dir->rec_len - EXT2_DIR_REC_LEN(dir->name_len);
|
|
|
|
dir->rec_len = EXT2_DIR_REC_LEN(dir->name_len);
|
|
|
|
dir = newdir;
|
|
}
|
|
|
|
dir->file_type = filetype;
|
|
dir->inode = inode;
|
|
dir->name_len = strlen(name);
|
|
memcpy(dir->name, name, strlen(name));
|
|
|
|
bRet = true;
|
|
break;
|
|
}
|
|
|
|
dir = (PEXT2_DIR_ENTRY2) (dir->rec_len + (PUCHAR) dir);
|
|
}
|
|
|
|
|
|
if (bRet)
|
|
return ext2_write_inode(Ext2Sys, parent, 0, buf, parent_inode.i_size, &dwRet);
|
|
|
|
return bRet;
|
|
}
|
|
|
|
|
|
bool ext2_reserve_inodes(PEXT2_FILESYS fs)
|
|
{
|
|
ULONG i;
|
|
int group;
|
|
|
|
for (i = EXT2_ROOT_INO + 1; i < EXT2_FIRST_INODE(fs->ext2_sb); i++)
|
|
{
|
|
ext2_mark_inode_bitmap(fs->inode_map, i);
|
|
group = ext2_group_of_ino(fs, i);
|
|
fs->group_desc[group].bg_free_inodes_count--;
|
|
fs->ext2_sb->s_free_inodes_count--;
|
|
}
|
|
|
|
return true;
|
|
}
|