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Bochs/bochs/iodev/hdimage.cc

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/////////////////////////////////////////////////////////////////////////
// $Id$
/////////////////////////////////////////////////////////////////////////
//
// Copyright (C) 2002-2011 The Bochs Project
//
// This library is free software; you can redistribute it and/or
// modify it under the terms of the GNU Lesser General Public
// License as published by the Free Software Foundation; either
// version 2 of the License, or (at your option) any later version.
//
// This library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
// Lesser General Public License for more details.
//
// You should have received a copy of the GNU Lesser General Public
// License along with this library; if not, write to the Free Software
// Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
/////////////////////////////////////////////////////////////////////////
// Define BX_PLUGGABLE in files that can be compiled into plugins. For
// platforms that require a special tag on exported symbols, BX_PLUGGABLE
// is used to know when we are exporting symbols and when we are importing.
#define BX_PLUGGABLE
#include "iodev.h"
#include "cdrom.h"
#include "hdimage.h"
#include "vmware3.h"
#include "vmware4.h"
#include "vvfat.h"
#if BX_HAVE_SYS_MMAN_H
#include <sys/mman.h>
#endif
#ifdef linux
#include <linux/fs.h>
#include <sys/ioctl.h>
#endif
#define LOG_THIS theHDImageCtl->
bx_hdimage_ctl_c* theHDImageCtl = NULL;
int libhdimage_LTX_plugin_init(plugin_t *plugin, plugintype_t type, int argc, char *argv[])
{
if (type == PLUGTYPE_CORE) {
theHDImageCtl = new bx_hdimage_ctl_c;
bx_devices.pluginHDImageCtl = theHDImageCtl;
return 0; // Success
} else {
return -1;
}
}
void libhdimage_LTX_plugin_fini(void)
{
delete theHDImageCtl;
}
bx_hdimage_ctl_c::bx_hdimage_ctl_c()
{
put("hdimage", "IMG");
}
device_image_t* bx_hdimage_ctl_c::init_image(Bit8u image_mode, Bit64u disk_size, const char *journal)
{
device_image_t *hdimage = NULL;
// instantiate the right class
switch (image_mode) {
case BX_HDIMAGE_MODE_FLAT:
hdimage = new default_image_t();
break;
case BX_HDIMAGE_MODE_CONCAT:
hdimage = new concat_image_t();
break;
#if EXTERNAL_DISK_SIMULATOR
case BX_HDIMAGE_MODE_EXTDISKSIM:
hdimage = new EXTERNAL_DISK_SIMULATOR_CLASS();
break;
#endif //EXTERNAL_DISK_SIMULATOR
#if DLL_HD_SUPPORT
case BX_HDIMAGE_MODE_DLL_HD:
hdimage = new dll_image_t();
break;
#endif //DLL_HD_SUPPORT
case BX_HDIMAGE_MODE_SPARSE:
hdimage = new sparse_image_t();
break;
case BX_HDIMAGE_MODE_VMWARE3:
hdimage = new vmware3_image_t();
break;
case BX_HDIMAGE_MODE_VMWARE4:
hdimage = new vmware4_image_t();
break;
case BX_HDIMAGE_MODE_UNDOABLE:
hdimage = new undoable_image_t(journal);
break;
case BX_HDIMAGE_MODE_GROWING:
hdimage = new growing_image_t();
break;
case BX_HDIMAGE_MODE_VOLATILE:
hdimage = new volatile_image_t(journal);
break;
case BX_HDIMAGE_MODE_VVFAT:
hdimage = new vvfat_image_t(disk_size, journal);
break;
default:
BX_PANIC(("unsupported HD mode : '%s'", hdimage_mode_names[image_mode]));
break;
}
return hdimage;
}
#ifdef LOWLEVEL_CDROM
LOWLEVEL_CDROM* bx_hdimage_ctl_c::init_cdrom(const char *dev)
{
return new LOWLEVEL_CDROM(dev);
}
#endif
/*** base class device_image_t ***/
device_image_t::device_image_t()
{
hd_size = 0;
}
Bit32u device_image_t::get_capabilities()
{
return (cylinders == 0) ? HDIMAGE_AUTO_GEOMETRY : 0;
}
/*** default_image_t function definitions ***/
int default_image_t::open(const char* pathname)
{
return open(pathname, O_RDWR);
}
int default_image_t::open(const char* pathname, int flags)
{
#ifdef WIN32
HANDLE hFile = CreateFile(pathname, GENERIC_READ, FILE_SHARE_READ, NULL, OPEN_EXISTING, FILE_FLAG_RANDOM_ACCESS, NULL);
if (hFile != INVALID_HANDLE_VALUE) {
ULARGE_INTEGER FileSize;
FileSize.LowPart = GetFileSize(hFile, &FileSize.HighPart);
CloseHandle(hFile);
if ((FileSize.LowPart != INVALID_FILE_SIZE) || (GetLastError() == NO_ERROR)) {
hd_size = FileSize.QuadPart;
} else {
return -1;
}
} else {
return -1;
}
#endif
fd = ::open(pathname, flags
#ifdef O_BINARY
| O_BINARY
#endif
);
if (fd < 0) {
return fd;
}
#ifndef WIN32
/* look at size of image file to calculate disk geometry */
struct stat stat_buf;
if (fstat(fd, &stat_buf)) {
BX_PANIC(("fstat() returns error!"));
}
#ifdef linux
if (stat_buf.st_rdev) { // Is this a special device file (e.g. /dev/sde) ?
ioctl(fd, BLKGETSIZE64, &hd_size); // yes it's!
}
else
#endif
{
hd_size = (Bit64u)stat_buf.st_size; // standard unix procedure to get size of regular files
}
#endif
BX_INFO(("hd_size: "FMT_LL"u", hd_size));
if (hd_size <= 0) BX_PANIC(("size of disk image not detected / invalid"));
if ((hd_size % 512) != 0) BX_PANIC(("size of disk image must be multiple of 512 bytes"));
return fd;
}
void default_image_t::close()
{
if (fd > -1) {
::close(fd);
}
}
Bit64s default_image_t::lseek(Bit64s offset, int whence)
{
return (Bit64s)::lseek(fd, (off_t)offset, whence);
}
ssize_t default_image_t::read(void* buf, size_t count)
{
return ::read(fd, (char*) buf, count);
}
ssize_t default_image_t::write(const void* buf, size_t count)
{
return ::write(fd, (char*) buf, count);
}
char increment_string(char *str, int diff)
{
// find the last character of the string, and increment it.
char *p = str;
while (*p != 0) p++;
BX_ASSERT(p>str); // choke on zero length strings
p--; // point to last character of the string
(*p) += diff; // increment to next/previous ascii code.
BX_DEBUG(("increment string returning '%s'", str));
return (*p);
}
/*** concat_image_t function definitions ***/
concat_image_t::concat_image_t()
{
fd = -1;
}
void concat_image_t::increment_string(char *str)
{
::increment_string(str, +1);
}
int concat_image_t::open(const char* pathname0)
{
char *pathname = strdup(pathname0);
BX_DEBUG(("concat_image_t.open"));
Bit64s start_offset = 0;
for (int i=0; i<BX_CONCAT_MAX_IMAGES; i++) {
fd_table[i] = ::open(pathname, O_RDWR
#ifdef O_BINARY
| O_BINARY
#endif
);
if (fd_table[i] < 0) {
// open failed.
// if no FD was opened successfully, return -1 (fail).
if (i==0) return -1;
// otherwise, it only means that all images in the series have
// been opened. Record the number of fds opened successfully.
maxfd = i;
break;
}
BX_DEBUG(("concat_image: open image %s, fd[%d] = %d", pathname, i, fd_table[i]));
/* look at size of image file to calculate disk geometry */
struct stat stat_buf;
int ret = fstat(fd_table[i], &stat_buf);
if (ret) {
BX_PANIC(("fstat() returns error!"));
}
#ifdef S_ISBLK
if (S_ISBLK(stat_buf.st_mode)) {
BX_PANIC(("block devices should REALLY NOT be used as concat images"));
}
#endif
if ((stat_buf.st_size % 512) != 0) {
BX_PANIC(("size of disk image must be multiple of 512 bytes"));
}
length_table[i] = stat_buf.st_size;
start_offset_table[i] = start_offset;
start_offset += stat_buf.st_size;
increment_string(pathname);
}
// start up with first image selected
index = 0;
fd = fd_table[0];
thismin = 0;
thismax = length_table[0]-1;
seek_was_last_op = 0;
hd_size = start_offset;
return 0; // success.
}
void concat_image_t::close()
{
BX_DEBUG(("concat_image_t.close"));
if (fd > -1) {
::close(fd);
}
}
Bit64s concat_image_t::lseek(Bit64s offset, int whence)
{
if ((offset % 512) != 0)
BX_PANIC(("lseek HD with offset not multiple of 512"));
BX_DEBUG(("concat_image_t.lseek(%d)", whence));
// is this offset in this disk image?
if (offset < thismin) {
// no, look at previous images
for (int i=index-1; i>=0; i--) {
if (offset >= start_offset_table[i]) {
index = i;
fd = fd_table[i];
thismin = start_offset_table[i];
thismax = thismin + length_table[i] - 1;
BX_DEBUG(("concat_image_t.lseek to earlier image, index=%d", index));
break;
}
}
} else if (offset > thismax) {
// no, look at later images
for (int i=index+1; i<maxfd; i++) {
if (offset < start_offset_table[i] + length_table[i]) {
index = i;
fd = fd_table[i];
thismin = start_offset_table[i];
thismax = thismin + length_table[i] - 1;
BX_DEBUG(("concat_image_t.lseek to earlier image, index=%d", index));
break;
}
}
}
// now offset should be within the current image.
offset -= start_offset_table[index];
if (offset < 0 || offset >= length_table[index]) {
BX_PANIC(("concat_image_t.lseek to byte %ld failed", (long)offset));
return -1;
}
seek_was_last_op = 1;
return (Bit64s)::lseek(fd, (off_t)offset, whence);
}
ssize_t concat_image_t::read(void* buf, size_t count)
{
BX_DEBUG(("concat_image_t.read %ld bytes", (long)count));
// notice if anyone does sequential read or write without seek in between.
// This can be supported pretty easily, but needs additional checks for
// end of a partial image.
if (!seek_was_last_op)
BX_PANIC(("no seek before read"));
return ::read(fd, (char*) buf, count);
}
ssize_t concat_image_t::write(const void* buf, size_t count)
{
BX_DEBUG(("concat_image_t.write %ld bytes", (long)count));
// notice if anyone does sequential read or write without seek in between.
// This can be supported pretty easily, but needs additional checks for
// end of a partial image.
if (!seek_was_last_op)
BX_PANIC(("no seek before write"));
return ::write(fd, (char*) buf, count);
}
/*** sparse_image_t function definitions ***/
sparse_image_t::sparse_image_t ()
{
fd = -1;
pathname = NULL;
#ifdef _POSIX_MAPPED_FILES
mmap_header = NULL;
#endif
pagetable = NULL;
parent_image = NULL;
}
/*
void showpagetable(Bit32u * pagetable, size_t numpages)
{
printf("Non null pages: ");
for (int i = 0; i < numpages; i++)
{
if (pagetable[i] != 0xffffffff)
{
printf("%d ", i);
}
}
printf("\n");
}
*/
void sparse_image_t::read_header()
{
BX_ASSERT(sizeof(header) == SPARSE_HEADER_SIZE);
int ret = ::read(fd, &header, sizeof(header));
if (-1 == ret)
{
panic(strerror(errno));
}
if (sizeof(header) != ret)
{
panic("could not read entire header");
}
if (dtoh32(header.magic) != SPARSE_HEADER_MAGIC)
{
panic("failed header magic check");
}
if ((dtoh32(header.version) != SPARSE_HEADER_VERSION) &&
(dtoh32(header.version) != SPARSE_HEADER_V1))
{
panic("unknown version in header");
}
pagesize = dtoh32(header.pagesize);
Bit32u numpages = dtoh32(header.numpages);
total_size = pagesize;
total_size *= numpages;
pagesize_shift = 0;
while ((pagesize >> pagesize_shift) > 1) pagesize_shift++;
if ((Bit32u)(1 << pagesize_shift) != pagesize)
{
panic("failed block size header check");
}
pagesize_mask = pagesize - 1;
size_t preamble_size = (sizeof(Bit32u) * numpages) + sizeof(header);
data_start = 0;
while ((size_t)data_start < preamble_size) data_start += pagesize;
bx_bool did_mmap = 0;
#ifdef _POSIX_MAPPED_FILES
// Try to memory map from the beginning of the file (0 is trivially a page multiple)
void *mmap_header = mmap(NULL, preamble_size, PROT_READ | PROT_WRITE, MAP_SHARED, fd, 0);
if (mmap_header == MAP_FAILED)
{
BX_INFO(("failed to mmap sparse disk file - using conventional file access"));
mmap_header = NULL;
}
else
{
mmap_length = preamble_size;
did_mmap = 1;
pagetable = ((Bit32u *) (((Bit8u *) mmap_header) + sizeof(header)));
system_pagesize_mask = getpagesize() - 1;
}
#endif
if (!did_mmap)
{
pagetable = new Bit32u[numpages];
if (pagetable == NULL)
{
panic("could not allocate memory for sparse disk block table");
}
ret = ::read(fd, pagetable, sizeof(Bit32u) * numpages);
if (-1 == ret)
{
panic(strerror(errno));
}
if ((int)(sizeof(Bit32u) * numpages) != ret)
{
panic("could not read entire block table");
}
}
}
int sparse_image_t::open (const char* pathname0)
{
pathname = strdup(pathname0);
BX_DEBUG(("sparse_image_t.open"));
fd = ::open(pathname, O_RDWR
#ifdef O_BINARY
| O_BINARY
#endif
);
if (fd < 0)
{
return -1; // open failed
}
BX_DEBUG(("sparse_image: open image %s", pathname));
read_header();
struct stat stat_buf;
if (fstat(fd, &stat_buf) != 0) panic(("fstat() returns error!"));
underlying_filesize = stat_buf.st_size;
if ((underlying_filesize % pagesize) != 0)
panic("size of sparse disk image is not multiple of page size");
underlying_current_filepos = 0;
if (-1 == ::lseek(fd, 0, SEEK_SET))
panic("error while seeking to start of file");
lseek(0, SEEK_SET);
//showpagetable(pagetable, header.numpages);
char * parentpathname = strdup(pathname);
char lastchar = ::increment_string(parentpathname, -1);
if ((lastchar >= '0') && (lastchar <= '9'))
{
struct stat stat_buf;
if (0 == stat(parentpathname, &stat_buf))
{
parent_image = new sparse_image_t();
int ret = parent_image->open(parentpathname);
if (ret != 0) return ret;
if ( (parent_image->pagesize != pagesize)
|| (parent_image->total_size != total_size))
{
panic("child drive image does not have same page count/page size configuration");
}
}
}
if (parentpathname != NULL) free(parentpathname);
if (dtoh32(header.version) == SPARSE_HEADER_VERSION) {
hd_size = dtoh64(header.disk);
}
return 0; // success
}
void sparse_image_t::close()
{
BX_DEBUG(("concat_image_t.close"));
if (pathname != NULL)
{
free(pathname);
}
#ifdef _POSIX_MAPPED_FILES
if (mmap_header != NULL)
{
int ret = munmap(mmap_header, mmap_length);
if (ret != 0)
BX_INFO(("failed to un-memory map sparse disk file"));
}
pagetable = NULL; // We didn't malloc it
#endif
if (fd > -1) {
::close(fd);
}
if (pagetable != NULL)
{
delete [] pagetable;
}
if (parent_image != NULL)
{
delete parent_image;
}
}
Bit64s sparse_image_t::lseek(Bit64s offset, int whence)
{
//showpagetable(pagetable, header.numpages);
if ((offset % 512) != 0)
BX_PANIC(("lseek HD with offset not multiple of 512"));
if (whence != SEEK_SET)
BX_PANIC(("lseek HD with whence not SEEK_SET"));
BX_DEBUG(("sparse_image_t.lseek(%d)", whence));
if (offset > total_size)
{
BX_PANIC(("sparse_image_t.lseek to byte %ld failed", (long)offset));
return -1;
}
//printf("Seeking to position %ld\n", (long) offset);
set_virtual_page((Bit32u)(offset >> pagesize_shift));
position_page_offset = (Bit32u)(offset & pagesize_mask);
return 0;
}
inline Bit64s sparse_image_t::get_physical_offset()
{
Bit64s physical_offset = data_start;
physical_offset += ((Bit64s)position_physical_page << pagesize_shift);
physical_offset += position_page_offset;
return physical_offset;
}
void sparse_image_t::set_virtual_page(Bit32u new_virtual_page)
{
position_virtual_page = new_virtual_page;
position_physical_page = dtoh32(pagetable[position_virtual_page]);
}
ssize_t sparse_image_t::read_page_fragment(Bit32u read_virtual_page, Bit32u read_page_offset, size_t read_size, void * buf)
{
if (read_virtual_page != position_virtual_page)
{
set_virtual_page(read_virtual_page);
}
position_page_offset = read_page_offset;
if (position_physical_page == SPARSE_PAGE_NOT_ALLOCATED)
{
if (parent_image != NULL)
{
return parent_image->read_page_fragment(read_virtual_page, read_page_offset, read_size, buf);
}
else
{
memset(buf, 0, read_size);
}
}
else
{
Bit64s physical_offset = get_physical_offset();
if (physical_offset != underlying_current_filepos)
{
off_t ret = ::lseek(fd, (off_t)physical_offset, SEEK_SET);
// underlying_current_filepos update deferred
if (ret == -1)
panic(strerror(errno));
}
//printf("Reading %s at position %ld size %d\n", pathname, (long) physical_offset, (long) read_size);
ssize_t readret = ::read(fd, buf, read_size);
if (readret == -1)
{
panic(strerror(errno));
}
if ((size_t)readret != read_size)
{
panic("could not read block contents from file");
}
underlying_current_filepos = physical_offset + read_size;
}
return read_size;
}
ssize_t sparse_image_t::read(void* buf, size_t count)
{
//showpagetable(pagetable, header.numpages);
ssize_t total_read = 0;
BX_DEBUG(("sparse_image_t.read %ld bytes", (long)count));
while (count != 0)
{
size_t can_read = pagesize - position_page_offset;
if (count < can_read) can_read = count;
BX_ASSERT (can_read != 0);
#if BX_ASSERT_ENABLE
size_t was_read = read_page_fragment(position_virtual_page, position_page_offset, can_read, buf);
#endif
BX_ASSERT(was_read == can_read);
total_read += can_read;
position_page_offset += can_read;
if (position_page_offset == pagesize)
{
position_page_offset = 0;
set_virtual_page(position_virtual_page + 1);
}
BX_ASSERT(position_page_offset < pagesize);
buf = (((Bit8u *) buf) + can_read);
count -= can_read;
}
return total_read;
}
void sparse_image_t::panic(const char * message)
{
char buffer[1024];
if (message == NULL)
{
snprintf(buffer, sizeof(buffer), "error with sparse disk image %s", pathname);
}
else
{
snprintf(buffer, sizeof(buffer), "error with sparse disk image %s - %s", pathname, message);
}
BX_PANIC(("%s", buffer));
}
ssize_t sparse_image_t::write (const void* buf, size_t count)
{
//showpagetable(pagetable, header.numpages);
ssize_t total_written = 0;
Bit32u update_pagetable_start = position_virtual_page;
Bit32u update_pagetable_count = 0;
BX_DEBUG(("sparse_image_t.write %ld bytes", (long)count));
while (count != 0)
{
size_t can_write = pagesize - position_page_offset;
if (count < can_write) can_write = count;
BX_ASSERT (can_write != 0);
if (position_physical_page == SPARSE_PAGE_NOT_ALLOCATED)
{
// We just add on another page at the end of the file
// Reclamation, compaction etc should currently be done off-line
Bit64s data_size = underlying_filesize - data_start;
BX_ASSERT((data_size % pagesize) == 0);
Bit32u data_size_pages = (Bit32u)(data_size / pagesize);
Bit32u next_data_page = data_size_pages;
pagetable[position_virtual_page] = htod32(next_data_page);
position_physical_page = next_data_page;
Bit64s page_file_start = data_start + ((Bit64s)position_physical_page << pagesize_shift);
if (parent_image != NULL)
{
// If we have a parent, we must merge our portion with the parent
void *writebuffer = NULL;
if (can_write == pagesize)
{
writebuffer = (void *) buf;
}
else
{
writebuffer = malloc(pagesize);
if (writebuffer == NULL)
panic("Cannot allocate sufficient memory for page-merge in write");
// Read entire page - could optimize, but simple for now
parent_image->read_page_fragment(position_virtual_page, 0, pagesize, writebuffer);
void *dest_start = ((Bit8u *) writebuffer) + position_page_offset;
memcpy(dest_start, buf, can_write);
}
int ret = (int)::lseek(fd, page_file_start, SEEK_SET);
// underlying_current_filepos update deferred
if (ret == -1) panic(strerror(errno));
ret = ::write(fd, writebuffer, pagesize);
if (ret == -1) panic(strerror(errno));
if (pagesize != (Bit32u)ret) panic("failed to write entire merged page to disk");
if (can_write != pagesize)
{
free(writebuffer);
}
}
else
{
// We need to write a zero page because read has been returning zeroes
// We seek as close to the page end as possible, and then write a little
// This produces a sparse file which has blanks
// Also very quick, even when pagesize is massive
int ret = (int)::lseek(fd, page_file_start + pagesize - 4, SEEK_SET);
// underlying_current_filepos update deferred
if (ret == -1) panic(strerror(errno));
Bit32u zero = 0;
ret = ::write(fd, &zero, 4);
if (ret == -1) panic(strerror(errno));
if (ret != 4) panic("failed to write entire blank page to disk");
}
update_pagetable_count = (position_virtual_page - update_pagetable_start) + 1;
underlying_filesize = underlying_current_filepos = page_file_start + pagesize;
}
BX_ASSERT(position_physical_page != SPARSE_PAGE_NOT_ALLOCATED);
Bit64s physical_offset = get_physical_offset();
if (physical_offset != underlying_current_filepos)
{
off_t ret = ::lseek(fd, (off_t)physical_offset, SEEK_SET);
// underlying_current_filepos update deferred
if (ret == -1)
panic(strerror(errno));
}
//printf("Writing at position %ld size %d\n", (long) physical_offset, can_write);
ssize_t writeret = ::write(fd, buf, can_write);
if (writeret == -1)
{
panic(strerror(errno));
}
if ((size_t)writeret != can_write)
{
panic("could not write block contents to file");
}
underlying_current_filepos = physical_offset + can_write;
total_written += can_write;
position_page_offset += can_write;
if (position_page_offset == pagesize)
{
position_page_offset = 0;
set_virtual_page(position_virtual_page + 1);
}
BX_ASSERT(position_page_offset < pagesize);
buf = (((Bit8u *) buf) + can_write);
count -= can_write;
}
if (update_pagetable_count != 0)
{
bx_bool done = 0;
off_t pagetable_write_from = sizeof(header) + (sizeof(Bit32u) * update_pagetable_start);
size_t write_bytecount = update_pagetable_count * sizeof(Bit32u);
#ifdef _POSIX_MAPPED_FILES
if (mmap_header != NULL)
{
// Sync from the beginning of the page
size_t system_page_offset = pagetable_write_from & system_pagesize_mask;
void *start = ((Bit8u *) mmap_header + pagetable_write_from - system_page_offset);
int ret = msync(start, system_page_offset + write_bytecount, MS_ASYNC);
if (ret != 0)
panic(strerror(errno));
done = 1;
}
#endif
if (!done)
{
int ret = (int)::lseek(fd, pagetable_write_from, SEEK_SET);
// underlying_current_filepos update deferred
if (ret == -1) panic(strerror(errno));
//printf("Writing header at position %ld size %ld\n", (long) pagetable_write_from, (long) write_bytecount);
ret = ::write(fd, &pagetable[update_pagetable_start], write_bytecount);
if (ret == -1) panic(strerror(errno));
if ((size_t)ret != write_bytecount) panic("could not write entire updated block header");
underlying_current_filepos = pagetable_write_from + write_bytecount;
}
}
return total_written;
}
#if DLL_HD_SUPPORT
/*** dll_image_t function definitions ***/
/*
function vdisk_open(path:PChar;numclusters,clustersize:integer):integer;
procedure vdisk_read(vunit:integer;blk:integer;var buf:TBlock);
procedure vdisk_write(vunit:integer;blk:integer;var buf:TBlock);
procedure vdisk_close(vunit:integer);
*/
HINSTANCE hlib_vdisk = 0;
int (*vdisk_open) (const char *path,int numclusters,int clustersize);
void (*vdisk_read) (int vunit,int blk,void *buf);
void (*vdisk_write) (int vunit,int blk,const void *buf);
void (*vdisk_close) (int vunit);
int dll_image_t::open (const char* pathname)
{
if (hlib_vdisk == 0) {
hlib_vdisk = LoadLibrary("vdisk.dll");
if (hlib_vdisk != 0) {
vdisk_read = (void (*)(int,int,void*)) GetProcAddress(hlib_vdisk,"vdisk_read");
vdisk_write = (void (*)(int,int,const void*)) GetProcAddress(hlib_vdisk,"vdisk_write");
vdisk_open = (int (*)(const char *,int,int)) GetProcAddress(hlib_vdisk,"vdisk_open");
vdisk_close = (void (*)(int)) GetProcAddress(hlib_vdisk,"vdisk_close");
}
}
if (hlib_vdisk != 0) {
vunit = vdisk_open(pathname,0x10000,64);
vblk = 0;
} else {
vunit = -2;
}
return vunit;
}
void dll_image_t::close ()
{
if (vunit >= 0 && hlib_vdisk != 0) {
vdisk_close(vunit);
}
}
Bit64s dll_image_t::lseek(Bit64s offset, int whence)
{
vblk = (int)(offset >> 9);
return 0;
}
ssize_t dll_image_t::read (void* buf, size_t count)
{
if (vunit >= 0 && hlib_vdisk != 0) {
vdisk_read(vunit,vblk,buf);
return count;
} else {
return -1;
}
}
ssize_t dll_image_t::write (const void* buf, size_t count)
{
if (vunit >= 0 && hlib_vdisk != 0) {
vdisk_write(vunit,vblk,buf);
return count;
} else {
return -1;
}
}
#endif // DLL_HD_SUPPORT
// redolog implementation
redolog_t::redolog_t()
{
fd = -1;
catalog = NULL;
bitmap = NULL;
extent_index = (Bit32u)0;
extent_offset = (Bit32u)0;
extent_next = (Bit32u)0;
}
void redolog_t::print_header()
{
BX_INFO(("redolog : Standard Header : magic='%s', type='%s', subtype='%s', version = %d.%d",
header.standard.magic, header.standard.type, header.standard.subtype,
dtoh32(header.standard.version)/0x10000,
dtoh32(header.standard.version)%0x10000));
if (dtoh32(header.standard.version) == STANDARD_HEADER_VERSION) {
BX_INFO(("redolog : Specific Header : #entries=%d, bitmap size=%d, exent size = %d disk size = " FMT_LL "d",
dtoh32(header.specific.catalog),
dtoh32(header.specific.bitmap),
dtoh32(header.specific.extent),
dtoh64(header.specific.disk)));
} else if (dtoh32(header.standard.version) == STANDARD_HEADER_V1) {
redolog_header_v1_t header_v1;
memcpy(&header_v1, &header, STANDARD_HEADER_SIZE);
BX_INFO(("redolog : Specific Header : #entries=%d, bitmap size=%d, exent size = %d disk size = " FMT_LL "d",
dtoh32(header_v1.specific.catalog),
dtoh32(header_v1.specific.bitmap),
dtoh32(header_v1.specific.extent),
dtoh64(header_v1.specific.disk)));
}
}
int redolog_t::make_header(const char* type, Bit64u size)
{
Bit32u entries, extent_size, bitmap_size;
Bit64u maxsize;
Bit32u flip=0;
// Set standard header values
memset(&header, 0, sizeof(redolog_header_t));
strcpy((char*)header.standard.magic, STANDARD_HEADER_MAGIC);
strcpy((char*)header.standard.type, REDOLOG_TYPE);
strcpy((char*)header.standard.subtype, type);
header.standard.version = htod32(STANDARD_HEADER_VERSION);
header.standard.header = htod32(STANDARD_HEADER_SIZE);
entries = 512;
bitmap_size = 1;
// Compute #entries and extent size values
do {
extent_size = 8 * bitmap_size * 512;
header.specific.catalog = htod32(entries);
header.specific.bitmap = htod32(bitmap_size);
header.specific.extent = htod32(extent_size);
maxsize = (Bit64u)entries * (Bit64u)extent_size;
flip++;
if(flip&0x01) bitmap_size *= 2;
else entries *= 2;
} while (maxsize < size);
header.specific.disk = htod64(size);
print_header();
catalog = (Bit32u*)malloc(dtoh32(header.specific.catalog) * sizeof(Bit32u));
bitmap = (Bit8u*)malloc(dtoh32(header.specific.bitmap));
if ((catalog == NULL) || (bitmap==NULL))
BX_PANIC(("redolog : could not malloc catalog or bitmap"));
for (Bit32u i=0; i<dtoh32(header.specific.catalog); i++)
catalog[i] = htod32(REDOLOG_PAGE_NOT_ALLOCATED);
bitmap_blocks = 1 + (dtoh32(header.specific.bitmap) - 1) / 512;
extent_blocks = 1 + (dtoh32(header.specific.extent) - 1) / 512;
BX_DEBUG(("redolog : each bitmap is %d blocks", bitmap_blocks));
BX_DEBUG(("redolog : each extent is %d blocks", extent_blocks));
return 0;
}
int redolog_t::create(const char* filename, const char* type, Bit64u size)
{
BX_INFO(("redolog : creating redolog %s", filename));
int filedes = ::open(filename, O_RDWR | O_CREAT | O_TRUNC
#ifdef O_BINARY
| O_BINARY
#endif
, S_IWUSR | S_IRUSR | S_IRGRP | S_IWGRP);
return create(filedes, type, size);
}
int redolog_t::create(int filedes, const char* type, Bit64u size)
{
fd = filedes;
if (fd < 0)
{
return -1; // open failed
}
if (make_header(type, size) < 0)
{
return -1;
}
// Write header
::write(fd, &header, dtoh32(header.standard.header));
// Write catalog
// FIXME could mmap
::write(fd, catalog, dtoh32(header.specific.catalog) * sizeof (Bit32u));
return 0;
}
int redolog_t::open(const char* filename, const char *type)
{
fd = ::open(filename, O_RDWR
#ifdef O_BINARY
| O_BINARY
#endif
);
if (fd < 0)
{
BX_INFO(("redolog : could not open image %s", filename));
// open failed.
return -1;
}
BX_INFO(("redolog : open image %s", filename));
int res = ::read(fd, &header, sizeof(header));
if (res != STANDARD_HEADER_SIZE)
{
BX_PANIC(("redolog : could not read header"));
return -1;
}
print_header();
if (strcmp((char*)header.standard.magic, STANDARD_HEADER_MAGIC) != 0)
{
BX_PANIC(("redolog : Bad header magic"));
return -1;
}
if (strcmp((char*)header.standard.type, REDOLOG_TYPE) != 0)
{
BX_PANIC(("redolog : Bad header type"));
return -1;
}
if (strcmp((char*)header.standard.subtype, type) != 0)
{
BX_PANIC(("redolog : Bad header subtype"));
return -1;
}
if ((dtoh32(header.standard.version) != STANDARD_HEADER_VERSION) &&
(dtoh32(header.standard.version) != STANDARD_HEADER_V1))
{
BX_PANIC(("redolog : Bad header version"));
return -1;
}
if (dtoh32(header.standard.version) == STANDARD_HEADER_V1) {
redolog_header_v1_t header_v1;
memcpy(&header_v1, &header, STANDARD_HEADER_SIZE);
header.specific.disk = header_v1.specific.disk;
}
catalog = (Bit32u*)malloc(dtoh32(header.specific.catalog) * sizeof(Bit32u));
// FIXME could mmap
::lseek(fd,dtoh32(header.standard.header),SEEK_SET);
res = ::read(fd, catalog, dtoh32(header.specific.catalog) * sizeof(Bit32u));
if (res != (ssize_t)(dtoh32(header.specific.catalog) * sizeof(Bit32u)))
{
BX_PANIC(("redolog : could not read catalog %d=%d",res, dtoh32(header.specific.catalog)));
return -1;
}
// check last used extent
extent_next = 0;
for (Bit32u i=0; i < dtoh32(header.specific.catalog); i++)
{
if (dtoh32(catalog[i]) != REDOLOG_PAGE_NOT_ALLOCATED)
{
if (dtoh32(catalog[i]) >= extent_next)
extent_next = dtoh32(catalog[i]) + 1;
}
}
BX_INFO(("redolog : next extent will be at index %d",extent_next));
// memory used for storing bitmaps
bitmap = (Bit8u *)malloc(dtoh32(header.specific.bitmap));
bitmap_blocks = 1 + (dtoh32(header.specific.bitmap) - 1) / 512;
extent_blocks = 1 + (dtoh32(header.specific.extent) - 1) / 512;
BX_DEBUG(("redolog : each bitmap is %d blocks", bitmap_blocks));
BX_DEBUG(("redolog : each extent is %d blocks", extent_blocks));
imagepos = 0;
return 0;
}
void redolog_t::close()
{
if (fd >= 0)
::close(fd);
if (catalog != NULL)
free(catalog);
if (bitmap != NULL)
free(bitmap);
}
Bit64u redolog_t::get_size()
{
return dtoh64(header.specific.disk);
}
Bit64s redolog_t::lseek(Bit64s offset, int whence)
{
if ((offset % 512) != 0) {
BX_PANIC(("redolog : lseek() offset not multiple of 512"));
return -1;
}
if (whence == SEEK_SET) {
imagepos = offset;
} else if (whence == SEEK_CUR) {
imagepos += offset;
} else {
BX_PANIC(("redolog: lseek() mode not supported yet"));
return -1;
}
if (imagepos > (Bit64s)dtoh64(header.specific.disk)) {
BX_PANIC(("redolog : lseek() to byte %ld failed", (long)offset));
return -1;
}
extent_index = (Bit32u)(imagepos / dtoh32(header.specific.extent));
extent_offset = (Bit32u)((imagepos % dtoh32(header.specific.extent)) / 512);
BX_DEBUG(("redolog : lseeking extent index %d, offset %d",extent_index, extent_offset));
return imagepos;
}
ssize_t redolog_t::read(void* buf, size_t count)
{
Bit64s block_offset, bitmap_offset;
ssize_t ret;
if (count != 512) {
BX_PANIC(("redolog : read() with count not 512"));
return -1;
}
BX_DEBUG(("redolog : reading index %d, mapping to %d", extent_index, dtoh32(catalog[extent_index])));
if (dtoh32(catalog[extent_index]) == REDOLOG_PAGE_NOT_ALLOCATED) {
// page not allocated
return 0;
}
bitmap_offset = (Bit64s)STANDARD_HEADER_SIZE + (dtoh32(header.specific.catalog) * sizeof(Bit32u));
bitmap_offset += (Bit64s)512 * dtoh32(catalog[extent_index]) * (extent_blocks + bitmap_blocks);
block_offset = bitmap_offset + ((Bit64s)512 * (bitmap_blocks + extent_offset));
BX_DEBUG(("redolog : bitmap offset is %x", (Bit32u)bitmap_offset));
BX_DEBUG(("redolog : block offset is %x", (Bit32u)block_offset));
// FIXME if same extent_index as before we can skip bitmap read
::lseek(fd, (off_t)bitmap_offset, SEEK_SET);
if (::read(fd, bitmap, dtoh32(header.specific.bitmap)) != (ssize_t)dtoh32(header.specific.bitmap)) {
BX_PANIC(("redolog : failed to read bitmap for extent %d", extent_index));
return -1;
}
if (((bitmap[extent_offset/8] >> (extent_offset%8)) & 0x01) == 0x00) {
BX_DEBUG(("read not in redolog"));
// bitmap says block not in redolog
return 0;
}
::lseek(fd, (off_t)block_offset, SEEK_SET);
ret = ::read(fd, buf, count);
if (ret >= 0) lseek(512, SEEK_CUR);
return ret;
}
ssize_t redolog_t::write(const void* buf, size_t count)
{
Bit32u i;
Bit64s block_offset, bitmap_offset, catalog_offset;
ssize_t written;
bx_bool update_catalog = 0;
if (count != 512) {
BX_PANIC(("redolog : write() with count not 512"));
return -1;
}
BX_DEBUG(("redolog : writing index %d, mapping to %d", extent_index, dtoh32(catalog[extent_index])));
if (dtoh32(catalog[extent_index]) == REDOLOG_PAGE_NOT_ALLOCATED) {
if (extent_next >= dtoh32(header.specific.catalog)) {
BX_PANIC(("redolog : can't allocate new extent... catalog is full"));
return -1;
}
BX_DEBUG(("redolog : allocating new extent at %d", extent_next));
// Extent not allocated, allocate new
catalog[extent_index] = htod32(extent_next);
extent_next += 1;
char *zerobuffer = (char*)malloc(512);
memset(zerobuffer, 0, 512);
// Write bitmap
bitmap_offset = (Bit64s)STANDARD_HEADER_SIZE + (dtoh32(header.specific.catalog) * sizeof(Bit32u));
bitmap_offset += (Bit64s)512 * dtoh32(catalog[extent_index]) * (extent_blocks + bitmap_blocks);
::lseek(fd, (off_t)bitmap_offset, SEEK_SET);
for (i=0; i<bitmap_blocks; i++) {
::write(fd, zerobuffer, 512);
}
// Write extent
for (i=0; i<extent_blocks; i++) {
::write(fd, zerobuffer, 512);
}
free(zerobuffer);
update_catalog = 1;
}
bitmap_offset = (Bit64s)STANDARD_HEADER_SIZE + (dtoh32(header.specific.catalog) * sizeof(Bit32u));
bitmap_offset += (Bit64s)512 * dtoh32(catalog[extent_index]) * (extent_blocks + bitmap_blocks);
block_offset = bitmap_offset + ((Bit64s)512 * (bitmap_blocks + extent_offset));
BX_DEBUG(("redolog : bitmap offset is %x", (Bit32u)bitmap_offset));
BX_DEBUG(("redolog : block offset is %x", (Bit32u)block_offset));
// Write block
::lseek(fd, (off_t)block_offset, SEEK_SET);
written = ::write(fd, buf, count);
// Write bitmap
// FIXME if same extent_index as before we can skip bitmap read
::lseek(fd, (off_t)bitmap_offset, SEEK_SET);
if (::read(fd, bitmap, dtoh32(header.specific.bitmap)) != (ssize_t)dtoh32(header.specific.bitmap)) {
BX_PANIC(("redolog : failed to read bitmap for extent %d", extent_index));
return 0;
}
// If bloc does not belong to extent yet
if (((bitmap[extent_offset/8] >> (extent_offset%8)) & 0x01) == 0x00) {
bitmap[extent_offset/8] |= 1 << (extent_offset%8);
::lseek(fd, (off_t)bitmap_offset, SEEK_SET);
::write(fd, bitmap, dtoh32(header.specific.bitmap));
}
// Write catalog
if (update_catalog) {
// FIXME if mmap
catalog_offset = (Bit64s)STANDARD_HEADER_SIZE + (extent_index * sizeof(Bit32u));
BX_DEBUG(("redolog : writing catalog at offset %x", (Bit32u)catalog_offset));
::lseek(fd, (off_t)catalog_offset, SEEK_SET);
::write(fd, &catalog[extent_index], sizeof(Bit32u));
}
if (written >= 0) lseek(512, SEEK_CUR);
return written;
}
/*** growing_image_t function definitions ***/
growing_image_t::growing_image_t()
{
redolog = new redolog_t();
}
growing_image_t::~growing_image_t()
{
delete redolog;
}
int growing_image_t::open(const char* pathname)
{
int filedes = redolog->open(pathname, REDOLOG_SUBTYPE_GROWING);
hd_size = redolog->get_size();
BX_INFO(("'growing' disk opened, growing file is '%s'", pathname));
return filedes;
}
void growing_image_t::close()
{
redolog->close();
}
Bit64s growing_image_t::lseek(Bit64s offset, int whence)
{
return redolog->lseek(offset, whence);
}
ssize_t growing_image_t::read(void* buf, size_t count)
{
size_t n = 0;
ssize_t ret = 0;
memset(buf, 0, count);
while (n < count) {
ret = redolog->read((char*) buf, 512);
if (ret < 0) break;
n += 512;
}
return (ret < 0) ? ret : count;
}
ssize_t growing_image_t::write(const void* buf, size_t count)
{
size_t n = 0;
ssize_t ret = 0;
while (n < count) {
ret = redolog->write((char*) buf, 512);
if (ret < 0) break;
n += 512;
}
return (ret < 0) ? ret : count;
}
/*** undoable_image_t function definitions ***/
undoable_image_t::undoable_image_t(const char* _redolog_name)
{
redolog = new redolog_t();
ro_disk = new default_image_t();
redolog_name = NULL;
if (_redolog_name != NULL) {
if (strcmp(_redolog_name,"") != 0) {
redolog_name = strdup(_redolog_name);
}
}
}
undoable_image_t::~undoable_image_t()
{
delete redolog;
delete ro_disk;
}
int undoable_image_t::open(const char* pathname)
{
char *logname=NULL;
if (ro_disk->open(pathname, O_RDONLY)<0)
return -1;
hd_size = ro_disk->hd_size;
// if redolog name was set
if (redolog_name != NULL) {
if (strcmp(redolog_name, "") != 0) {
logname = (char*)malloc(strlen(redolog_name) + 1);
strcpy(logname, redolog_name);
}
}
// Otherwise we make up the redolog filename from the pathname
if (logname == NULL) {
logname = (char*)malloc(strlen(pathname) + UNDOABLE_REDOLOG_EXTENSION_LENGTH + 1);
sprintf(logname, "%s%s", pathname, UNDOABLE_REDOLOG_EXTENSION);
}
if (redolog->open(logname,REDOLOG_SUBTYPE_UNDOABLE) < 0)
{
if (redolog->create(logname, REDOLOG_SUBTYPE_UNDOABLE, hd_size) < 0)
{
BX_PANIC(("Can't open or create redolog '%s'",logname));
return -1;
}
if (hd_size != redolog->get_size())
{
BX_PANIC(("size reported by redolog doesn't match r/o disk size"));
free(logname);
return -1;
}
}
BX_INFO(("'undoable' disk opened: ro-file is '%s', redolog is '%s'", pathname, logname));
free(logname);
return 0;
}
void undoable_image_t::close ()
{
redolog->close();
ro_disk->close();
if (redolog_name!=NULL)
free(redolog_name);
}
Bit64s undoable_image_t::lseek(Bit64s offset, int whence)
{
redolog->lseek(offset, whence);
return ro_disk->lseek(offset, whence);
}
ssize_t undoable_image_t::read(void* buf, size_t count)
{
size_t n = 0;
ssize_t ret = 0;
while (n < count) {
if ((size_t)redolog->read((char*) buf, 512) != 512) {
ret = ro_disk->read((char*) buf, 512);
if (ret < 0) break;
}
n += 512;
}
return (ret < 0) ? ret : count;
}
ssize_t undoable_image_t::write(const void* buf, size_t count)
{
size_t n = 0;
ssize_t ret = 0;
while (n < count) {
ret = redolog->write((char*) buf, 512);
if (ret < 0) break;
n += 512;
}
return (ret < 0) ? ret : count;
}
/*** volatile_image_t function definitions ***/
volatile_image_t::volatile_image_t(const char* _redolog_name)
{
redolog = new redolog_t();
ro_disk = new default_image_t();
redolog_temp = NULL;
redolog_name = NULL;
if (_redolog_name != NULL) {
if (strcmp(_redolog_name,"") != 0) {
redolog_name = strdup(_redolog_name);
}
}
}
volatile_image_t::~volatile_image_t()
{
delete redolog;
delete ro_disk;
}
int volatile_image_t::open(const char* pathname)
{
int filedes;
const char *logname=NULL;
if (ro_disk->open(pathname, O_RDONLY)<0)
return -1;
hd_size = ro_disk->hd_size;
// if redolog name was set
if (redolog_name != NULL) {
if (strcmp(redolog_name, "") != 0) {
logname = redolog_name;
}
}
// otherwise use pathname as template
if (logname == NULL) {
logname = pathname;
}
redolog_temp = (char*)malloc(strlen(logname) + VOLATILE_REDOLOG_EXTENSION_LENGTH + 1);
sprintf (redolog_temp, "%s%s", logname, VOLATILE_REDOLOG_EXTENSION);
filedes = mkstemp (redolog_temp);
if (filedes < 0)
{
BX_PANIC(("Can't create volatile redolog '%s'", redolog_temp));
return -1;
}
if (redolog->create(filedes, REDOLOG_SUBTYPE_VOLATILE, hd_size) < 0)
{
BX_PANIC(("Can't create volatile redolog '%s'", redolog_temp));
return -1;
}
#if (!defined(WIN32)) && !BX_WITH_MACOS
// on unix it is legal to delete an open file
unlink(redolog_temp);
#endif
BX_INFO(("'volatile' disk opened: ro-file is '%s', redolog is '%s'", pathname, redolog_temp));
return 0;
}
void volatile_image_t::close()
{
redolog->close();
ro_disk->close();
#if defined(WIN32) || BX_WITH_MACOS
// on non-unix we have to wait till the file is closed to delete it
unlink(redolog_temp);
#endif
if (redolog_temp!=NULL)
free(redolog_temp);
if (redolog_name!=NULL)
free(redolog_name);
}
Bit64s volatile_image_t::lseek(Bit64s offset, int whence)
{
redolog->lseek(offset, whence);
return ro_disk->lseek(offset, whence);
}
ssize_t volatile_image_t::read(void* buf, size_t count)
{
size_t n = 0;
ssize_t ret = 0;
while (n < count) {
if ((size_t)redolog->read((char*) buf, 512) != 512) {
ret = ro_disk->read((char*) buf, 512);
if (ret < 0) break;
}
n += 512;
}
return (ret < 0) ? ret : count;
}
ssize_t volatile_image_t::write(const void* buf, size_t count)
{
size_t n = 0;
ssize_t ret = 0;
while (n < count) {
ret = redolog->write((char*) buf, 512);
if (ret < 0) break;
n += 512;
}
return (ret < 0) ? ret : count;
}
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