[PATCH 17/21] block: move struct partition out of genhd.h

Christoph Hellwig
2020-03-24T07:48:03Z

struct partition is the on-disk format of a MSDOS partition table entry.
Move it out of genhd.h into a new msdos_partition.h header and give it
a msdos_ prefix to avoid confusion.
Also move the magic number from block/partitions/msdos.h to the new
header so that it can be used by the SCSI drivers looking at the DOS
partition tables.

Signed-off-by: Christoph Hellwig <hch@lst.de>
---
block/partitions/ldm.c | 6 +++---
block/partitions/msdos.c | 28 ++++++++++++++--------------
block/partitions/msdos.h | 8 --------
drivers/scsi/BusLogic.c | 8 +++++---
drivers/scsi/aacraid/linit.c | 7 ++++---
drivers/scsi/scsi_debug.c | 5 +++--
drivers/scsi/scsicam.c | 3 ++-
include/linux/genhd.h | 13 -------------
include/linux/msdos_partition.h | 20 ++++++++++++++++++++
9 files changed, 51 insertions(+), 47 deletions(-)
delete mode 100644 block/partitions/msdos.h
create mode 100644 include/linux/msdos_partition.h

diff --git a/block/partitions/ldm.c b/block/partitions/ldm.c
index a2d97ee1908c..6fdfcb40c537 100644
--- a/block/partitions/ldm.c
+++ b/block/partitions/ldm.c
@@ -14,10 +14,10 @@
#include <linux/stringify.h>
#include <linux/kernel.h>
#include <linux/uuid.h>
+#include <linux/msdos_partition.h>

#include "ldm.h"
#include "check.h"
-#include "msdos.h"

/*
* ldm_debug/info/error/crit - Output an error message
@@ -493,7 +493,7 @@ static bool ldm_validate_partition_table(struct parsed_partitions *state)
{
Sector sect;
u8 *data;
- struct partition *p;
+ struct msdos_partition *p;
int i;
bool result = false;

@@ -508,7 +508,7 @@ static bool ldm_validate_partition_table(struct parsed_partitions *state)
if (*(__le16*) (data + 0x01FE) != cpu_to_le16 (MSDOS_LABEL_MAGIC))
goto out;

- p = (struct partition*)(data + 0x01BE);
+ p = (struct msdos_partition *)(data + 0x01BE);
for (i = 0; i < 4; i++, p++)
if (SYS_IND (p) == LDM_PARTITION) {
result = true;
diff --git a/block/partitions/msdos.c b/block/partitions/msdos.c
index c572022f3781..88ee5ee7f442 100644
--- a/block/partitions/msdos.c
+++ b/block/partitions/msdos.c
@@ -20,9 +20,9 @@
* Re-organised Feb 1998 Russell King
*/
#include <linux/msdos_fs.h>
+#include <linux/msdos_partition.h>

#include "check.h"
-#include "msdos.h"
#include "efi.h"

/*
@@ -34,17 +34,17 @@

#define SYS_IND(p) get_unaligned(&p->sys_ind)

-static inline sector_t nr_sects(struct partition *p)
+static inline sector_t nr_sects(struct msdos_partition *p)
{
return (sector_t)get_unaligned_le32(&p->nr_sects);
}

-static inline sector_t start_sect(struct partition *p)
+static inline sector_t start_sect(struct msdos_partition *p)
{
return (sector_t)get_unaligned_le32(&p->start_sect);
}

-static inline int is_extended_partition(struct partition *p)
+static inline int is_extended_partition(struct msdos_partition *p)
{
return (SYS_IND(p) == DOS_EXTENDED_PARTITION ||
SYS_IND(p) == WIN98_EXTENDED_PARTITION ||
@@ -67,7 +67,7 @@ msdos_magic_present(unsigned char *p)
#define AIX_LABEL_MAGIC4 0xC1
static int aix_magic_present(struct parsed_partitions *state, unsigned char *p)
{
- struct partition *pt = (struct partition *) (p + 0x1be);
+ struct msdos_partition *pt = (struct msdos_partition *) (p + 0x1be);
Sector sect;
unsigned char *d;
int slot, ret = 0;
@@ -121,7 +121,7 @@ static void parse_extended(struct parsed_partitions *state,
sector_t first_sector, sector_t first_size,
u32 disksig)
{
- struct partition *p;
+ struct msdos_partition *p;
Sector sect;
unsigned char *data;
sector_t this_sector, this_size;
@@ -145,7 +145,7 @@ static void parse_extended(struct parsed_partitions *state,
if (!msdos_magic_present(data + 510))
goto done;

- p = (struct partition *) (data + 0x1be);
+ p = (struct msdos_partition *) (data + 0x1be);

/*
* Usually, the first entry is the real data partition,
@@ -402,14 +402,14 @@ static void parse_minix(struct parsed_partitions *state,
#ifdef CONFIG_MINIX_SUBPARTITION
Sector sect;
unsigned char *data;
- struct partition *p;
+ struct msdos_partition *p;
int i;

data = read_part_sector(state, offset, &sect);
if (!data)
return;

- p = (struct partition *)(data + 0x1be);
+ p = (struct msdos_partition *)(data + 0x1be);

/* The first sector of a Minix partition can have either
* a secondary MBR describing its subpartitions, or
@@ -453,7 +453,7 @@ int msdos_partition(struct parsed_partitions *state)
sector_t sector_size = bdev_logical_block_size(state->bdev) / 512;
Sector sect;
unsigned char *data;
- struct partition *p;
+ struct msdos_partition *p;
struct fat_boot_sector *fb;
int slot;
u32 disksig;
@@ -487,7 +487,7 @@ int msdos_partition(struct parsed_partitions *state)
* partition table. Reject this in case the boot indicator
* is not 0 or 0x80.
*/
- p = (struct partition *) (data + 0x1be);
+ p = (struct msdos_partition *) (data + 0x1be);
for (slot = 1; slot <= 4; slot++, p++) {
if (p->boot_ind != 0 && p->boot_ind != 0x80) {
/*
@@ -509,7 +509,7 @@ int msdos_partition(struct parsed_partitions *state)
}

#ifdef CONFIG_EFI_PARTITION
- p = (struct partition *) (data + 0x1be);
+ p = (struct msdos_partition *) (data + 0x1be);
for (slot = 1 ; slot <= 4 ; slot++, p++) {
/* If this is an EFI GPT disk, msdos should ignore it. */
if (SYS_IND(p) == EFI_PMBR_OSTYPE_EFI_GPT) {
@@ -518,7 +518,7 @@ int msdos_partition(struct parsed_partitions *state)
}
}
#endif
- p = (struct partition *) (data + 0x1be);
+ p = (struct msdos_partition *) (data + 0x1be);

disksig = le32_to_cpup((__le32 *)(data + 0x1b8));

@@ -565,7 +565,7 @@ int msdos_partition(struct parsed_partitions *state)
strlcat(state->pp_buf, "\n", PAGE_SIZE);

/* second pass - output for each on a separate line */
- p = (struct partition *) (0x1be + data);
+ p = (struct msdos_partition *) (0x1be + data);
for (slot = 1 ; slot <= 4 ; slot++, p++) {
unsigned char id = SYS_IND(p);
int n;
diff --git a/block/partitions/msdos.h b/block/partitions/msdos.h
deleted file mode 100644
index 123e666bb932..000000000000
--- a/block/partitions/msdos.h
+++ /dev/null
@@ -1,8 +0,0 @@
-/* SPDX-License-Identifier: GPL-2.0 */
-/*
- * fs/partitions/msdos.h
- */
-
-#define MSDOS_LABEL_MAGIC 0xAA55
-
-
diff --git a/drivers/scsi/BusLogic.c b/drivers/scsi/BusLogic.c
index 3170b295a5da..186259417449 100644
--- a/drivers/scsi/BusLogic.c
+++ b/drivers/scsi/BusLogic.c
@@ -36,6 +36,7 @@
#include <linux/jiffies.h>
#include <linux/dma-mapping.h>
#include <linux/slab.h>
+#include <linux/msdos_partition.h>
#include <scsi/scsicam.h>

#include <asm/dma.h>
@@ -3410,9 +3411,10 @@ static int blogic_diskparam(struct scsi_device *sdev, struct block_device *dev,
a partition table entry whose end_head matches one of the
standard BusLogic geometry translations (64/32, 128/32, or 255/63).
*/
- if (*(unsigned short *) (buf + 64) == 0xAA55) {
- struct partition *part1_entry = (struct partition *) buf;
- struct partition *part_entry = part1_entry;
+ if (*(unsigned short *) (buf + 64) == MSDOS_LABEL_MAGIC) {
+ struct msdos_partition *part1_entry =
+ (struct msdos_partition *)buf;
+ struct msdos_partition *part_entry = part1_entry;
int saved_cyl = diskparam->cylinders, part_no;
unsigned char part_end_head = 0, part_end_sector = 0;

diff --git a/drivers/scsi/aacraid/linit.c b/drivers/scsi/aacraid/linit.c
index ee6bc2f9b80a..0443b74390cf 100644
--- a/drivers/scsi/aacraid/linit.c
+++ b/drivers/scsi/aacraid/linit.c
@@ -33,6 +33,7 @@
#include <linux/syscalls.h>
#include <linux/delay.h>
#include <linux/kthread.h>
+#include <linux/msdos_partition.h>

#include <scsi/scsi.h>
#include <scsi/scsi_cmnd.h>
@@ -328,9 +329,9 @@ static int aac_biosparm(struct scsi_device *sdev, struct block_device *bdev,
buf = scsi_bios_ptable(bdev);
if (!buf)
return 0;
- if(*(__le16 *)(buf + 0x40) == cpu_to_le16(0xaa55)) {
- struct partition *first = (struct partition * )buf;
- struct partition *entry = first;
+ if (*(__le16 *)(buf + 0x40) == cpu_to_le16(MSDOS_LABEL_MAGIC)) {
+ struct msdos_partition *first = (struct msdos_partition *)buf;
+ struct msdos_partition *entry = first;
int saved_cylinders = param->cylinders;
int num;
unsigned char end_head, end_sec;
diff --git a/drivers/scsi/scsi_debug.c b/drivers/scsi/scsi_debug.c
index 44cb054d5e66..4c6c448dc2df 100644
--- a/drivers/scsi/scsi_debug.c
+++ b/drivers/scsi/scsi_debug.c
@@ -38,6 +38,7 @@
#include <linux/hrtimer.h>
#include <linux/uuid.h>
#include <linux/t10-pi.h>
+#include <linux/msdos_partition.h>

#include <net/checksum.h>

@@ -4146,7 +4147,7 @@ static int scsi_debug_host_reset(struct scsi_cmnd *SCpnt)
static void __init sdebug_build_parts(unsigned char *ramp,
unsigned long store_size)
{
- struct partition *pp;
+ struct msdos_partition *pp;
int starts[SDEBUG_MAX_PARTS + 2];
int sectors_per_part, num_sectors, k;
int heads_by_sects, start_sec, end_sec;
@@ -4171,7 +4172,7 @@ static void __init sdebug_build_parts(unsigned char *ramp,

ramp[510] = 0x55; /* magic partition markings */
ramp[511] = 0xAA;
- pp = (struct partition *)(ramp + 0x1be);
+ pp = (struct msdos_partition *)(ramp + 0x1be);
for (k = 0; starts[k + 1]; ++k, ++pp) {
start_sec = starts[k];
end_sec = starts[k + 1] - 1;
diff --git a/drivers/scsi/scsicam.c b/drivers/scsi/scsicam.c
index 665d7db2f94c..682cf08ab041 100644
--- a/drivers/scsi/scsicam.c
+++ b/drivers/scsi/scsicam.c
@@ -17,6 +17,7 @@
#include <linux/genhd.h>
#include <linux/kernel.h>
#include <linux/blkdev.h>
+#include <linux/msdos_partition.h>
#include <asm/unaligned.h>

#include <scsi/scsicam.h>
@@ -61,7 +62,7 @@ bool scsi_partsize(struct block_device *bdev, sector_t capacity, int geom[3])
{
int cyl, ext_cyl, end_head, end_cyl, end_sector;
unsigned int logical_end, physical_end, ext_physical_end;
- struct partition *p, *largest = NULL;
+ struct msdos_partition *p, *largest = NULL;
void *buf;
int ret = false;

diff --git a/include/linux/genhd.h b/include/linux/genhd.h
index 77f8bb8edfcd..3d84da9ec0fa 100644
--- a/include/linux/genhd.h
+++ b/include/linux/genhd.h
@@ -70,19 +70,6 @@ enum {
#include <linux/fs.h>
#include <linux/workqueue.h>

-struct partition {
- unsigned char boot_ind; /* 0x80 - active */
- unsigned char head; /* starting head */
- unsigned char sector; /* starting sector */
- unsigned char cyl; /* starting cylinder */
- unsigned char sys_ind; /* What partition type */
- unsigned char end_head; /* end head */
- unsigned char end_sector; /* end sector */
- unsigned char end_cyl; /* end cylinder */
- __le32 start_sect; /* starting sector counting from 0 */
- __le32 nr_sects; /* nr of sectors in partition */
-} __attribute__((packed));
-
struct disk_stats {
u64 nsecs[NR_STAT_GROUPS];
unsigned long sectors[NR_STAT_GROUPS];
diff --git a/include/linux/msdos_partition.h b/include/linux/msdos_partition.h
new file mode 100644
index 000000000000..a8e2c1b4bc66
--- /dev/null
+++ b/include/linux/msdos_partition.h
@@ -0,0 +1,20 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef _LINUX_MSDOS_PARTITION_H
+#define _LINUX_MSDOS_PARTITION_H
+
+#define MSDOS_LABEL_MAGIC 0xAA55
+
+struct msdos_partition {
+ u8 boot_ind; /* 0x80 - active */
+ u8 head; /* starting head */
+ u8 sector; /* starting sector */
+ u8 cyl; /* starting cylinder */
+ u8 sys_ind; /* What partition type */
+ u8 end_head; /* end head */
+ u8 end_sector; /* end sector */
+ u8 end_cyl; /* end cylinder */
+ __le32 start_sect; /* starting sector counting from 0 */
+ __le32 nr_sects; /* nr of sectors in partition */
+} __packed;
+
+#endif /* LINUX_MSDOS_PARTITION_H */
--
2.25.1