393 lines
12 KiB
C++
393 lines
12 KiB
C++
/*
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* This file provides support for VMWare's virtual disk image
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* format.
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*
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* Author: Sharvil Nanavati, for Net Integration Technologies, Inc.
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* Contact: snrrrub@yahoo.com
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*
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* Copyright (C) 2003 Net Integration Technologies, Inc.
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#include "bochs.h"
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/* Not very friendly... */
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extern bx_hard_drive_c *theHardDrive;
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#define LOG_THIS theHardDrive->
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bool vmware3_image_t::is_valid_header(COW_Header & header)
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{
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if(header.id[0] != 'C' || header.id[1] != 'O' || header.id[2] != 'W' ||
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header.id[3] != 'D')
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{
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BX_DEBUG(("not a vmware3 COW disk"));
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return false;
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}
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if(header.header_version != 3)
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{
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BX_DEBUG(("unsupported vmware3 COW disk header version"));
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return false;
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}
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if(header.vmware_version != 2)
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{
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BX_DEBUG(("unsupported vmware3 COW disk version"));
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return false;
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}
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return true;
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}
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char * vmware3_image_t::generate_cow_name(const char * filename, unsigned chain)
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{
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char * name = new char[strlen(filename) + 4];
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if(name == 0)
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BX_PANIC(("unable to allocate %d bytes for vmware3 COW file name (base: %s, chain: %d)", strlen(filename) + 4, filename, chain));
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strcpy(name, filename);
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if(chain != 0)
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{
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char * period = strrchr(name, '.');
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if (period != 0)
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{
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char temp[1024];
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strcpy(temp, period + 1);
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*period = 0;
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sprintf(name, "%s-%02d.%s", name, chain + 1, temp);
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}
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else
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sprintf(name, "%s-%02d", name, chain + 1);
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}
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return name;
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}
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/*
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* This function will panic if errors occur when attempting to open an image
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* file. Now if only I could use exceptions to handle the errors in an elegant
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* fashion...
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*/
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int vmware3_image_t::open(const char * pathname)
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{
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COW_Header header;
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int file;
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int flags = O_RDWR;
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#ifdef O_BINARY
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flags |= O_BINARY;
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#endif
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/* Open the virtual disk */
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file = ::open(pathname, flags);
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if(file < 0)
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return -1;
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/* Read the header */
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if(::read(file, &header, sizeof(COW_Header)) < 0)
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BX_PANIC(("unable to read vmware3 COW Disk header from file '%s'", pathname));
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/* Make sure it's a valid header */
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if(!is_valid_header(header))
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BX_PANIC(("invalid vmware3 COW Disk image"));
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::close(file);
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tlb_size = header.tlb_size_sectors * 512;
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slb_count = (1 << FL_SHIFT) / tlb_size;
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images = new COW_Image [header.number_of_chains];
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off_t offset = 0;
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for (int i = 0; i < header.number_of_chains; ++i)
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{
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char * filename = generate_cow_name(pathname, i);
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current = &images[i];
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current->fd = ::open(filename, flags);
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if(current->fd < 0)
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BX_PANIC(("unable to open vmware3 COW Disk file '%s'", filename));
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if(::read(current->fd, ¤t->header, sizeof(COW_Header)) < 0)
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BX_PANIC(("unable to read header or invalid header in vmware3 COW Disk file '%s'", filename));
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if(!is_valid_header(current->header))
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BX_PANIC(("invalid vmware3 COW Disk file '%s'", filename));
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current->flb = new unsigned [current->header.flb_count];
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if(current->flb == 0)
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BX_PANIC(("cannot allocate %d bytes for flb in vmware3 COW Disk '%s'", current->header.flb_count * 4, filename));
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current->slb = new unsigned * [current->header.flb_count];
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if(current->slb == 0)
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BX_PANIC(("cannot allocate %d bytes for slb in vmware3 COW Disk '%s'", current->header.flb_count * 4, filename));
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for(int j = 0; j < current->header.flb_count; ++j)
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{
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current->slb[j] = new unsigned [slb_count];
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if(current->slb[j] == 0)
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BX_PANIC(("cannot allocate %d bytes for slb[] in vmware3 COW Disk '%s'", slb_count * 4, filename));
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}
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current->tlb = new char [tlb_size];
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if(current->tlb == 0)
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BX_PANIC(("cannot allocate %d bytes for tlb in vmware3 COW Disk '%s'", tlb_size, filename));
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if(::lseek(current->fd, current->header.flb_offset_sectors * 512, SEEK_SET) < 0)
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BX_PANIC(("unable to seek vmware3 COW Disk file '%s'", filename));
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if(::read(current->fd, (char*)current->flb, current->header.flb_count * 4) < 0)
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BX_PANIC(("unable to read flb from vmware3 COW Disk file '%s'", filename));
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for(int j = 0; j < current->header.flb_count; ++j)
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if(current->flb[j] != 0)
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{
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if(::lseek(current->fd, current->flb[j] * 512, SEEK_SET) < 0)
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BX_PANIC(("unable to seek vmware3 COW Disk file '%s'", filename));
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if(::read(current->fd, (char*)current->slb[j], slb_count * 4) < 0)
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BX_PANIC(("unable to read slb from vmware3 COW Disk file '%s'", filename));
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}
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current->min_offset = offset;
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offset += current->header.total_sectors * 512;
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current->max_offset = offset;
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current->offset = INVALID_OFFSET;
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current->synced = true;
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delete[] filename;
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}
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current = &images[0];
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requested_offset = 0;
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cylinders = header.cylinders_in_disk;
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heads = header.heads_in_disk;
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sectors = header.sectors_in_disk;
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return 1;
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}
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off_t vmware3_image_t::perform_seek()
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{
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if(requested_offset < current->min_offset || requested_offset >= current->max_offset)
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{
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if(!sync())
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{
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BX_DEBUG(("could not sync before switching vmware3 COW files"));
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return INVALID_OFFSET;
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}
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while(requested_offset < current->min_offset)
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current = &images[current->header.chain_id - 1];
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while(requested_offset >= current->max_offset)
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current = &images[current->header.chain_id + 1];
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}
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if(current->offset != INVALID_OFFSET && requested_offset >= current->offset
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&& requested_offset < current->offset + tlb_size)
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return (requested_offset - current->offset);
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if(!sync())
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{
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BX_DEBUG(("could not sync before seeking vmware3 COW file"));
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return INVALID_OFFSET;
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}
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unsigned relative_offset = (requested_offset - current->min_offset);
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unsigned i = relative_offset >> FL_SHIFT;
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unsigned j = (relative_offset & ~FL_MASK) / tlb_size;
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if(current->slb[i][j])
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{
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if(::lseek(current->fd, current->slb[i][j] * 512, SEEK_SET) < 0)
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{
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BX_DEBUG(("could not seek vmware3 COW to sector slb[%d][%d]", i, j));
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return INVALID_OFFSET;
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}
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if(::read(current->fd, current->tlb, tlb_size) < 0)
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{
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BX_DEBUG(("could not read %d bytes from vmware3 COW image", tlb_size));
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return INVALID_OFFSET;
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}
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}
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else
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memset(current->tlb, 0, tlb_size);
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current->offset = (requested_offset / tlb_size) * tlb_size;
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return (requested_offset - current->offset);
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}
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ssize_t vmware3_image_t::read(void * buf, size_t count)
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{
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ssize_t total = 0;
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while(count > 0)
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{
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off_t offset = perform_seek();
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if(offset == INVALID_OFFSET)
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{
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BX_DEBUG(("vmware3 COW read failed on %d bytes", count));
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return -1;
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}
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unsigned bytes_remaining = tlb_size - offset;
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unsigned amount = (bytes_remaining > count) ? count : bytes_remaining;
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memcpy(buf, current->tlb + offset, amount);
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requested_offset += amount;
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total += amount;
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count -= amount;
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}
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return total;
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}
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/* This could be done much better, I'm sure. In fact, the whole header doesn't
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* need to be re-written each time a new tlb is allocated nor does the whole
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* slb need to be re-written (most of the time) but that can be changed whenever
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* it becomes an issue... image I/O is not a bottleneck.
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*/
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bool vmware3_image_t::sync()
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{
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if(current->synced)
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return true;
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unsigned relative_offset = (current->offset - current->min_offset);
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unsigned i = relative_offset >> FL_SHIFT;
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unsigned j = (relative_offset & ~FL_MASK) / tlb_size;
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if (current->slb[i][j] == 0)
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{
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if (current->flb[i] == 0)
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{
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unsigned slb_size = slb_count * 4;
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/* Re-write the FLB */
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current->flb[i] = current->header.next_sector_to_allocate;
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if(::lseek(current->fd, current->header.flb_offset_sectors * 512, SEEK_SET) < 0)
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{
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BX_DEBUG(("could not seek vmware3 COW image to flb on sync"));
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return false;
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}
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if(::write(current->fd, current->flb, current->header.flb_count * 4) < 0)
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{
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BX_DEBUG(("could not re-write flb to vmware3 COW image on sync"));
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return false;
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}
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current->header.next_sector_to_allocate += (slb_size / 512) + ((slb_size % 512) ? 1 : 0);
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}
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/* Re-write the SLB */
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current->slb[i][j] = current->header.next_sector_to_allocate;
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if(::lseek(current->fd, current->flb[i] * 512, SEEK_SET) < 0)
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{
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BX_DEBUG(("could not seek vmware3 COW image to slb on sync"));
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return false;
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}
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if(::write(current->fd, current->slb[i], slb_count * 4) < 0)
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{
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BX_DEBUG(("could not re-write slb to vmware3 COW image on sync"));
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return false;
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}
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current->header.next_sector_to_allocate += current->header.tlb_size_sectors;
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/* Update the header */
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if(::lseek(current->fd, 0, SEEK_SET) < 0)
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{
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BX_DEBUG(("could not seek to vmware3 COW image to offset 0 on sync"));
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return false;
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}
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if(::write(current->fd, ¤t->header, sizeof(COW_Header)) < 0)
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{
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BX_DEBUG(("could not re-write header to vmware3 COW image on sync"));
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return false;
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}
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}
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if(::lseek(current->fd, current->slb[i][j] * 512, SEEK_SET) < 0)
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{
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BX_DEBUG(("could not seek vmware3 COW image to offset %d on sync", current->slb[i][j] * 512));
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return false;
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}
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if(::write(current->fd, current->tlb, tlb_size) < 0)
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{
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BX_DEBUG(("could not write tlb to vmware3 COW image on sync"));
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return false;
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}
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current->synced = true;
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return true;
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}
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ssize_t vmware3_image_t::write(const void * buf, size_t count)
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{
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ssize_t total = 0;
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while(count > 0)
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{
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off_t offset = perform_seek();
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if(offset == INVALID_OFFSET)
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return -1;
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unsigned bytes_remaining = tlb_size - offset;
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unsigned amount = 0;
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current->synced = false;
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if(bytes_remaining > count)
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{
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memcpy(current->tlb + offset, buf, count);
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amount = count;
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}
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else
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{
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memcpy(current->tlb + offset, buf, bytes_remaining);
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if(!sync())
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{
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BX_DEBUG(("failed to sync when writing %d bytes", count));
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return -1;
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}
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amount = bytes_remaining;
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}
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requested_offset += amount;
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total += amount;
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count -= amount;
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}
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return total;
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}
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off_t vmware3_image_t::lseek(off_t offset, int whence)
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{
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if(whence == SEEK_SET)
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requested_offset = offset;
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else if (whence == SEEK_CUR)
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requested_offset += offset;
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else if (whence == SEEK_END)
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requested_offset = (off_t)(current->header.total_sectors_in_disk * 512) + offset;
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else
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{
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BX_DEBUG(("unknown 'whence' value (%d) when trying to seek vmware3 COW image", whence));
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return -1;
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}
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return requested_offset;
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}
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void vmware3_image_t::close()
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{
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if(current == 0)
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return;
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unsigned count = current->header.number_of_chains;
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for(int i = 0; i < count; ++i)
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{
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current = &images[i];
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for(int j = 0; j < current->header.flb_count; ++j)
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delete[] current->slb[j];
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delete[] current->flb;
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delete[] current->slb;
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delete[] current->tlb;
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::close(current->fd);
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}
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delete[] images;
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current = 0;
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}
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