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Add cheatmounting

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This commit is contained in:
Vladimir 'phcoder' Serbinenko 2011-04-22 19:20:46 +02:00
parent dcd73ec05e
commit 24089d19e2
4 changed files with 166 additions and 40 deletions
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75
grub-core/kern/emu/hostdisk.c
View file

@ -631,6 +631,37 @@ linux_find_partition (char *dev, unsigned long sector)
}
#endif /* __linux__ */
#if defined(__linux__) && (!defined(__GLIBC__) || \
((__GLIBC__ < 2) || ((__GLIBC__ == 2) && (__GLIBC_MINOR__ < 1))))
/* Maybe libc doesn't have large file support. */
grub_err_t
grub_util_fd_sector_seek (int fd, const char *name, grub_disk_addr_t sector)
{
loff_t offset, result;
static int _llseek (uint filedes, ulong hi, ulong lo,
loff_t *res, uint wh);
_syscall5 (int, _llseek, uint, filedes, ulong, hi, ulong, lo,
loff_t *, res, uint, wh);
offset = (loff_t) sector << GRUB_DISK_SECTOR_BITS;
if (_llseek (fd, offset >> 32, offset & 0xffffffff, &result, SEEK_SET))
{
return grub_error (GRUB_ERR_BAD_DEVICE, "cannot seek `%s'", name);
}
return GRUB_ERR_NONE;
}
#else
grub_err_t
grub_util_fd_sector_seek (int fd, const char *name, grub_disk_addr_t sector)
{
off_t offset = (off_t) sector << GRUB_DISK_SECTOR_BITS;
if (lseek (fd, offset, SEEK_SET) != offset)
return grub_error (GRUB_ERR_BAD_DEVICE, "cannot seek `%s'", name);
return 0;
}
#endif
static int
open_device (const grub_disk_t disk, grub_disk_addr_t sector, int flags)
{
@ -781,44 +812,19 @@ open_device (const grub_disk_t disk, grub_disk_addr_t sector, int flags)
configure_device_driver (fd);
#endif /* defined(__NetBSD__) */
#if defined(__linux__) && (!defined(__GLIBC__) || \
((__GLIBC__ < 2) || ((__GLIBC__ == 2) && (__GLIBC_MINOR__ < 1))))
/* Maybe libc doesn't have large file support. */
{
loff_t offset, result;
static int _llseek (uint filedes, ulong hi, ulong lo,
loff_t *res, uint wh);
_syscall5 (int, _llseek, uint, filedes, ulong, hi, ulong, lo,
loff_t *, res, uint, wh);
offset = (loff_t) sector << GRUB_DISK_SECTOR_BITS;
if (_llseek (fd, offset >> 32, offset & 0xffffffff, &result, SEEK_SET))
{
grub_error (GRUB_ERR_BAD_DEVICE, "cannot seek `%s'", map[disk->id].device);
close (fd);
return -1;
}
}
#else
{
off_t offset = (off_t) sector << GRUB_DISK_SECTOR_BITS;
if (lseek (fd, offset, SEEK_SET) != offset)
{
grub_error (GRUB_ERR_BAD_DEVICE, "cannot seek `%s'", map[disk->id].device);
close (fd);
return -1;
}
}
#endif
if (grub_util_fd_sector_seek (fd, map[disk->id].device, sector))
{
close (fd);
return -1;
}
return fd;
}
/* Read LEN bytes from FD in BUF. Return less than or equal to zero if an
error occurs, otherwise return LEN. */
static ssize_t
nread (int fd, char *buf, size_t len)
ssize_t
grub_util_fd_read (int fd, char *buf, size_t len)
{
ssize_t size = len;
@ -901,7 +907,8 @@ grub_util_biosdisk_read (grub_disk_t disk, grub_disk_addr_t sector,
sectors that are read together with the MBR in one read. It
should only remap the MBR, so we split the read in two
parts. -jochen */
if (nread (fd, buf, GRUB_DISK_SECTOR_SIZE) != GRUB_DISK_SECTOR_SIZE)
if (grub_util_fd_read (fd, buf, GRUB_DISK_SECTOR_SIZE)
!= GRUB_DISK_SECTOR_SIZE)
{
grub_error (GRUB_ERR_READ_ERROR, "cannot read `%s'", map[disk->id].device);
return grub_errno;
@ -912,7 +919,7 @@ grub_util_biosdisk_read (grub_disk_t disk, grub_disk_addr_t sector,
}
#endif /* __linux__ */
if (nread (fd, buf, size << GRUB_DISK_SECTOR_BITS)
if (grub_util_fd_read (fd, buf, size << GRUB_DISK_SECTOR_BITS)
!= (ssize_t) (size << GRUB_DISK_SECTOR_BITS))
grub_error (GRUB_ERR_READ_ERROR, "cannot read from `%s'", map[disk->id].device);