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2010-02-03 Vladimir Serbinenko <phcoder@gmail.com>

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* util/hostdisk.c (open_device): Don't use partition device when reading
	before the partition.
	(grub_util_biosdisk_read): Don't read from partition and before the
	partition in single operation.
	(grub_util_biosdisk_write): Don't write to partition and before the
	partition in single operation.
This commit is contained in:
Vladimir 'phcoder' Serbinenko 2010-02-03 00:49:35 +01:00
parent 399f6e4d9c
commit 2b4068e992
2 changed files with 45 additions and 1 deletions
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9
ChangeLog
View file

@ -1,3 +1,12 @@
2010-02-03 Vladimir Serbinenko <phcoder@gmail.com>
* util/hostdisk.c (open_device): Don't use partition device when reading
before the partition.
(grub_util_biosdisk_read): Don't read from partition and before the
partition in single operation.
(grub_util_biosdisk_write): Don't write to partition and before the
partition in single operation.
2010-02-03 Torsten Landschoff <torsten@debian.org>
* kern/disk.c (grub_disk_read): Fix offset computation when reading

37
util/hostdisk.c
View file

@ -336,7 +336,8 @@ open_device (const grub_disk_t disk, grub_disk_addr_t sector, int flags)
char dev[PATH_MAX];
strcpy (dev, map[disk->id].device);
if (disk->partition && strncmp (map[disk->id].device, "/dev/", 5) == 0)
if (disk->partition && sector >= disk->partition->start
&& strncmp (map[disk->id].device, "/dev/", 5) == 0)
is_partition = linux_find_partition (dev, disk->partition->start);
/* Open the partition. */
@ -490,6 +491,23 @@ grub_util_biosdisk_read (grub_disk_t disk, grub_disk_addr_t sector,
{
int fd;
/* Split pre-partition and partition reads. */
if (disk->partition && sector < disk->partition->start
&& sector + size > disk->partition->start)
{
grub_err_t err;
err = grub_util_biosdisk_read (disk, sector,
disk->partition->start - sector,
buf);
if (err)
return err;
return grub_util_biosdisk_read (disk, disk->partition->start,
size - (disk->partition->start - sector),
buf + ((disk->partition->start - sector)
<< GRUB_DISK_SECTOR_BITS));
}
fd = open_device (disk, sector, O_RDONLY);
if (fd < 0)
return grub_errno;
@ -527,6 +545,23 @@ grub_util_biosdisk_write (grub_disk_t disk, grub_disk_addr_t sector,
{
int fd;
/* Split pre-partition and partition writes. */
if (disk->partition && sector < disk->partition->start
&& sector + size > disk->partition->start)
{
grub_err_t err;
err = grub_util_biosdisk_write (disk, sector,
disk->partition->start - sector,
buf);
if (err)
return err;
return grub_util_biosdisk_write (disk, disk->partition->start,
size - (disk->partition->start - sector),
buf + ((disk->partition->start - sector)
<< GRUB_DISK_SECTOR_BITS));
}
fd = open_device (disk, sector, O_WRONLY);
if (fd < 0)
return grub_errno;