On Fri, Feb 03, 2023 at 10:10:43AM +0530, Mukesh Kumar Chaurasiya wrote:
> The disk sector size provided by sysfs file system considers the
> sector size of 512 irrespective of disk sector size, Thus
> causing the read by grub to an incorrect offset from what was
> originally intended.
>
> Considering the 512 sector size of sysfs data the actual sector
> needs to be modified corresponding to disk sector size.
>
> Signed-off-by: Mukesh Kumar Chaurasiya <mchau...@linux.vnet.ibm.com>
> ---
> grub-core/osdep/linux/hostdisk.c | 15 ++++++++++++---
> 1 file changed, 12 insertions(+), 3 deletions(-)
>
> diff --git a/grub-core/osdep/linux/hostdisk.c
> b/grub-core/osdep/linux/hostdisk.c
> index 07058f63a..13e4e2feb 100644
> --- a/grub-core/osdep/linux/hostdisk.c
> +++ b/grub-core/osdep/linux/hostdisk.c
> @@ -197,8 +197,15 @@ have_devfs (void)
>
> #pragma GCC diagnostic ignored "-Wformat-nonliteral"
>
> +static inline grub_disk_addr_t
> +transform_sector (grub_disk_t disk, grub_disk_addr_t sector)
> +{
> + return sector >> (disk->log_sector_size - GRUB_DISK_SECTOR_BITS);
> +}
Please take a look at include/grub/disk.h:grub_disk_from_native_sector()
and define grub_disk_to_native_sector() next to it.
> +
> static int
> -grub_hostdisk_linux_find_partition (char *dev, grub_disk_addr_t sector)
> +grub_hostdisk_linux_find_partition (const grub_disk_t disk, char *dev,
> + grub_disk_addr_t sector)
> {
> size_t len = strlen (dev);
> const char *format;
> @@ -263,7 +270,8 @@ grub_hostdisk_linux_find_partition (char *dev,
> grub_disk_addr_t sector)
> if (fstat (fd, &st) < 0
> || !grub_util_device_is_mapped_stat (&st)
> || !grub_util_get_dm_node_linear_info (st.st_rdev, 0, 0, &start))
> - start = grub_util_find_partition_start_os (real_dev);
> + start = transform_sector (disk,
> + grub_util_find_partition_start_os
> (real_dev));
You do not need to wrap lines which are a bit longer than 80 characters.
> /* We don't care about errors here. */
> grub_errno = GRUB_ERR_NONE;
>
> @@ -344,7 +352,8 @@ grub_util_fd_open_device (const grub_disk_t disk,
> grub_disk_addr_t sector, int f
> && strncmp (dev, "/dev/", 5) == 0)
> {
> if (sector >= part_start)
> - is_partition = grub_hostdisk_linux_find_partition (dev, part_start);
> + is_partition = grub_hostdisk_linux_find_partition (disk, dev,
> + part_start);
Ditto.
Daniel
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