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Date: Wed, 10 Mar 2010 15:12:48 -0800
From: "Daniel Taylor" <Daniel.Taylor@....com>
To: "OGAWA Hirofumi" <hirofumi@...l.parknet.co.jp>,
"Andrew Morton" <akpm@...ux-foundation.org>
Cc: "H. Peter Anvin" <hpa@...or.com>, <linux-kernel@...r.kernel.org>
Subject: RE: [PATCH 1/2] fs/partitions/msdos: add support for large disks
Looks good to me.
Thank you for the review/fixes.
Regards,
Dan
> -----Original Message-----
> From: OGAWA Hirofumi [mailto:hirofumi@...l.parknet.co.jp]
> Sent: Wednesday, March 10, 2010 7:48 AM
> To: Andrew Morton
> Cc: H. Peter Anvin; Daniel Taylor; linux-kernel@...r.kernel.org
> Subject: [PATCH 1/2] fs/partitions/msdos: add support for large disks
>
> Hi,
>
> This is rediff with fix of "Daniel Taylor" <Daniel.Taylor@....com>.
> Daniel, please check I'm breaking your patch.
>
>
>
> From: "Daniel Taylor" <Daniel.Taylor@....com>
>
> In order to use disks larger than 2TiB on Windows XP, it is necessary
> to use 4096-byte logical sectors in an MBR.
>
> Although the kernel storage and functions called from msdos.c used
> "sector_t" internally, msdos.c still used u32 variables, which results
> in the ability to handle XP-compatible large disks.
>
> This patch changes the internal variables to "sector_t".
>
> Signed-off-by: Daniel Taylor <daniel.taylor@....com>
> [tweaks and fix]
> Signed-off-by: OGAWA Hirofumi <hirofumi@...l.parknet.co.jp>
> ---
>
> fs/partitions/msdos.c | 74
> +++++++++++++++++++++++++------------------------
> 1 file changed, 39 insertions(+), 35 deletions(-)
>
> diff -puN fs/partitions/msdos.c~part-support-4k-block
> fs/partitions/msdos.c
> --- linux-2.6/fs/partitions/msdos.c~part-support-4k-block
> 2010-03-07 04:10:48.000000000 +0900
> +++ linux-2.6-hirofumi/fs/partitions/msdos.c 2010-03-07
> 19:41:56.000000000 +0900
> @@ -31,14 +31,17 @@
> */
> #include <asm/unaligned.h>
>
> -#define SYS_IND(p) (get_unaligned(&p->sys_ind))
> -#define NR_SECTS(p) ({ __le32 __a =
> get_unaligned(&p->nr_sects); \
> - le32_to_cpu(__a); \
> - })
> -
> -#define START_SECT(p) ({ __le32 __a =
> get_unaligned(&p->start_sect); \
> - le32_to_cpu(__a); \
> - })
> +#define SYS_IND(p) get_unaligned(&p->sys_ind)
> +
> +static inline sector_t nr_sects(struct partition *p)
> +{
> + return (sector_t)get_unaligned_le32(&p->nr_sects);
> +}
> +
> +static inline sector_t start_sect(struct partition *p)
> +{
> + return (sector_t)get_unaligned_le32(&p->start_sect);
> +}
>
> static inline int is_extended_partition(struct partition *p)
> {
> @@ -104,13 +107,13 @@ static int aix_magic_present(unsigned ch
>
> static void
> parse_extended(struct parsed_partitions *state, struct
> block_device *bdev,
> - u32 first_sector, u32 first_size)
> + sector_t first_sector, sector_t first_size)
> {
> struct partition *p;
> Sector sect;
> unsigned char *data;
> - u32 this_sector, this_size;
> - int sector_size = bdev_logical_block_size(bdev) / 512;
> + sector_t this_sector, this_size;
> + sector_t sector_size = bdev_logical_block_size(bdev) / 512;
> int loopct = 0; /* number of links followed
> without finding a data partition */
> int i;
> @@ -145,14 +148,14 @@ parse_extended(struct parsed_partitions
> * First process the data partition(s)
> */
> for (i=0; i<4; i++, p++) {
> - u32 offs, size, next;
> - if (!NR_SECTS(p) || is_extended_partition(p))
> + sector_t offs, size, next;
> + if (!nr_sects(p) || is_extended_partition(p))
> continue;
>
> /* Check the 3rd and 4th entries -
> these sometimes contain random garbage */
> - offs = START_SECT(p)*sector_size;
> - size = NR_SECTS(p)*sector_size;
> + offs = start_sect(p)*sector_size;
> + size = nr_sects(p)*sector_size;
> next = this_sector + offs;
> if (i >= 2) {
> if (offs + size > this_size)
> @@ -179,13 +182,13 @@ parse_extended(struct parsed_partitions
> */
> p -= 4;
> for (i=0; i<4; i++, p++)
> - if (NR_SECTS(p) && is_extended_partition(p))
> + if (nr_sects(p) && is_extended_partition(p))
> break;
> if (i == 4)
> goto done; /* nothing left to do */
>
> - this_sector = first_sector + START_SECT(p) *
> sector_size;
> - this_size = NR_SECTS(p) * sector_size;
> + this_sector = first_sector + start_sect(p) *
> sector_size;
> + this_size = nr_sects(p) * sector_size;
> put_dev_sector(sect);
> }
> done:
> @@ -197,7 +200,7 @@ done:
>
> static void
> parse_solaris_x86(struct parsed_partitions *state, struct
> block_device *bdev,
> - u32 offset, u32 size, int origin)
> + sector_t offset, sector_t size, int origin)
> {
> #ifdef CONFIG_SOLARIS_X86_PARTITION
> Sector sect;
> @@ -244,7 +247,7 @@ parse_solaris_x86(struct parsed_partitio
> */
> static void
> parse_bsd(struct parsed_partitions *state, struct block_device *bdev,
> - u32 offset, u32 size, int origin, char *flavour,
> + sector_t offset, sector_t size, int origin,
> char *flavour,
> int max_partitions)
> {
> Sector sect;
> @@ -263,7 +266,7 @@ parse_bsd(struct parsed_partitions *stat
> if (le16_to_cpu(l->d_npartitions) < max_partitions)
> max_partitions = le16_to_cpu(l->d_npartitions);
> for (p = l->d_partitions; p - l->d_partitions <
> max_partitions; p++) {
> - u32 bsd_start, bsd_size;
> + sector_t bsd_start, bsd_size;
>
> if (state->next == state->limit)
> break;
> @@ -290,7 +293,7 @@ parse_bsd(struct parsed_partitions *stat
>
> static void
> parse_freebsd(struct parsed_partitions *state, struct
> block_device *bdev,
> - u32 offset, u32 size, int origin)
> + sector_t offset, sector_t size, int origin)
> {
> #ifdef CONFIG_BSD_DISKLABEL
> parse_bsd(state, bdev, offset, size, origin,
> @@ -300,7 +303,7 @@ parse_freebsd(struct parsed_partitions *
>
> static void
> parse_netbsd(struct parsed_partitions *state, struct
> block_device *bdev,
> - u32 offset, u32 size, int origin)
> + sector_t offset, sector_t size, int origin)
> {
> #ifdef CONFIG_BSD_DISKLABEL
> parse_bsd(state, bdev, offset, size, origin,
> @@ -310,7 +313,7 @@ parse_netbsd(struct parsed_partitions *s
>
> static void
> parse_openbsd(struct parsed_partitions *state, struct
> block_device *bdev,
> - u32 offset, u32 size, int origin)
> + sector_t offset, sector_t size, int origin)
> {
> #ifdef CONFIG_BSD_DISKLABEL
> parse_bsd(state, bdev, offset, size, origin,
> @@ -324,7 +327,7 @@ parse_openbsd(struct parsed_partitions *
> */
> static void
> parse_unixware(struct parsed_partitions *state, struct
> block_device *bdev,
> - u32 offset, u32 size, int origin)
> + sector_t offset, sector_t size, int origin)
> {
> #ifdef CONFIG_UNIXWARE_DISKLABEL
> Sector sect;
> @@ -348,7 +351,8 @@ parse_unixware(struct parsed_partitions
>
> if (p->s_label != UNIXWARE_FS_UNUSED)
> put_partition(state, state->next++,
> - START_SECT(p),
> NR_SECTS(p));
> + le32_to_cpu(p->start_sect),
> + le32_to_cpu(p->nr_sects));
> p++;
> }
> put_dev_sector(sect);
> @@ -363,7 +367,7 @@ parse_unixware(struct parsed_partitions
> */
> static void
> parse_minix(struct parsed_partitions *state, struct
> block_device *bdev,
> - u32 offset, u32 size, int origin)
> + sector_t offset, sector_t size, int origin)
> {
> #ifdef CONFIG_MINIX_SUBPARTITION
> Sector sect;
> @@ -390,7 +394,7 @@ parse_minix(struct parsed_partitions *st
> /* add each partition in use */
> if (SYS_IND(p) == MINIX_PARTITION)
> put_partition(state, state->next++,
> - START_SECT(p),
> NR_SECTS(p));
> + start_sect(p),
> nr_sects(p));
> }
> printk(" >\n");
> }
> @@ -401,7 +405,7 @@ parse_minix(struct parsed_partitions *st
> static struct {
> unsigned char id;
> void (*parse)(struct parsed_partitions *, struct block_device *,
> - u32, u32, int);
> + sector_t, sector_t, int);
> } subtypes[] = {
> {FREEBSD_PARTITION, parse_freebsd},
> {NETBSD_PARTITION, parse_netbsd},
> @@ -415,7 +419,7 @@ static struct {
>
> int msdos_partition(struct parsed_partitions *state, struct
> block_device *bdev)
> {
> - int sector_size = bdev_logical_block_size(bdev) / 512;
> + sector_t sector_size = bdev_logical_block_size(bdev) / 512;
> Sector sect;
> unsigned char *data;
> struct partition *p;
> @@ -483,8 +487,8 @@ int msdos_partition(struct parsed_partit
>
> state->next = 5;
> for (slot = 1 ; slot <= 4 ; slot++, p++) {
> - u32 start = START_SECT(p)*sector_size;
> - u32 size = NR_SECTS(p)*sector_size;
> + sector_t start = start_sect(p)*sector_size;
> + sector_t size = nr_sects(p)*sector_size;
> if (!size)
> continue;
> if (is_extended_partition(p)) {
> @@ -513,7 +517,7 @@ int msdos_partition(struct parsed_partit
> unsigned char id = SYS_IND(p);
> int n;
>
> - if (!NR_SECTS(p))
> + if (!nr_sects(p))
> continue;
>
> for (n = 0; subtypes[n].parse && id !=
> subtypes[n].id; n++)
> @@ -521,8 +525,8 @@ int msdos_partition(struct parsed_partit
>
> if (!subtypes[n].parse)
> continue;
> - subtypes[n].parse(state, bdev,
> START_SECT(p)*sector_size,
> -
> NR_SECTS(p)*sector_size, slot);
> + subtypes[n].parse(state, bdev,
> start_sect(p)*sector_size,
> +
> nr_sects(p)*sector_size, slot);
> }
> put_dev_sector(sect);
> return 1;
> _
>
> --
> OGAWA Hirofumi <hirofumi@...l.parknet.co.jp>
>
--
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