Adding upstream version 6.6.15.upstream/6.6.15

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 206 insertions, 0 deletions

diff --git a/block/partitions/amiga.c b/block/partitions/amiga.c
new file mode 100644
index 0000000000..5069210954
--- /dev/null
+++ b/block/partitions/amiga.c
@@ -0,0 +1,206 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ *  fs/partitions/amiga.c
+ *
+ *  Code extracted from drivers/block/genhd.c
+ *
+ *  Copyright (C) 1991-1998  Linus Torvalds
+ *  Re-organised Feb 1998 Russell King
+ */
+
+#define pr_fmt(fmt) fmt
+
+#include <linux/types.h>
+#include <linux/mm_types.h>
+#include <linux/overflow.h>
+#include <linux/affs_hardblocks.h>
+
+#include "check.h"
+
+/* magic offsets in partition DosEnvVec */
+#define NR_HD	3
+#define NR_SECT	5
+#define LO_CYL	9
+#define HI_CYL	10
+
+static __inline__ u32
+checksum_block(__be32 *m, int size)
+{
+	u32 sum = 0;
+
+	while (size--)
+		sum += be32_to_cpu(*m++);
+	return sum;
+}
+
+int amiga_partition(struct parsed_partitions *state)
+{
+	Sector sect;
+	unsigned char *data;
+	struct RigidDiskBlock *rdb;
+	struct PartitionBlock *pb;
+	u64 start_sect, nr_sects;
+	sector_t blk, end_sect;
+	u32 cylblk;		/* rdb_CylBlocks = nr_heads*sect_per_track */
+	u32 nr_hd, nr_sect, lo_cyl, hi_cyl;
+	int part, res = 0;
+	unsigned int blksize = 1;	/* Multiplier for disk block size */
+	int slot = 1;
+
+	for (blk = 0; ; blk++, put_dev_sector(sect)) {
+		if (blk == RDB_ALLOCATION_LIMIT)
+			goto rdb_done;
+		data = read_part_sector(state, blk, &sect);
+		if (!data) {
+			pr_err("Dev %s: unable to read RDB block %llu\n",
+			       state->disk->disk_name, blk);
+			res = -1;
+			goto rdb_done;
+		}
+		if (*(__be32 *)data != cpu_to_be32(IDNAME_RIGIDDISK))
+			continue;
+
+		rdb = (struct RigidDiskBlock *)data;
+		if (checksum_block((__be32 *)data, be32_to_cpu(rdb->rdb_SummedLongs) & 0x7F) == 0)
+			break;
+		/* Try again with 0xdc..0xdf zeroed, Windows might have
+		 * trashed it.
+		 */
+		*(__be32 *)(data+0xdc) = 0;
+		if (checksum_block((__be32 *)data,
+				be32_to_cpu(rdb->rdb_SummedLongs) & 0x7F)==0) {
+			pr_err("Trashed word at 0xd0 in block %llu ignored in checksum calculation\n",
+			       blk);
+			break;
+		}
+
+		pr_err("Dev %s: RDB in block %llu has bad checksum\n",
+		       state->disk->disk_name, blk);
+	}
+
+	/* blksize is blocks per 512 byte standard block */
+	blksize = be32_to_cpu( rdb->rdb_BlockBytes ) / 512;
+
+	{
+		char tmp[7 + 10 + 1 + 1];
+
+		/* Be more informative */
+		snprintf(tmp, sizeof(tmp), " RDSK (%d)", blksize * 512);
+		strlcat(state->pp_buf, tmp, PAGE_SIZE);
+	}
+	blk = be32_to_cpu(rdb->rdb_PartitionList);
+	put_dev_sector(sect);
+	for (part = 1; (s32) blk>0 && part<=16; part++, put_dev_sector(sect)) {
+		/* Read in terms partition table understands */
+		if (check_mul_overflow(blk, (sector_t) blksize, &blk)) {
+			pr_err("Dev %s: overflow calculating partition block %llu! Skipping partitions %u and beyond\n",
+				state->disk->disk_name, blk, part);
+			break;
+		}
+		data = read_part_sector(state, blk, &sect);
+		if (!data) {
+			pr_err("Dev %s: unable to read partition block %llu\n",
+			       state->disk->disk_name, blk);
+			res = -1;
+			goto rdb_done;
+		}
+		pb  = (struct PartitionBlock *)data;
+		blk = be32_to_cpu(pb->pb_Next);
+		if (pb->pb_ID != cpu_to_be32(IDNAME_PARTITION))
+			continue;
+		if (checksum_block((__be32 *)pb, be32_to_cpu(pb->pb_SummedLongs) & 0x7F) != 0 )
+			continue;
+
+		/* RDB gives us more than enough rope to hang ourselves with,
+		 * many times over (2^128 bytes if all fields max out).
+		 * Some careful checks are in order, so check for potential
+		 * overflows.
+		 * We are multiplying four 32 bit numbers to one sector_t!
+		 */
+
+		nr_hd   = be32_to_cpu(pb->pb_Environment[NR_HD]);
+		nr_sect = be32_to_cpu(pb->pb_Environment[NR_SECT]);
+
+		/* CylBlocks is total number of blocks per cylinder */
+		if (check_mul_overflow(nr_hd, nr_sect, &cylblk)) {
+			pr_err("Dev %s: heads*sects %u overflows u32, skipping partition!\n",
+				state->disk->disk_name, cylblk);
+			continue;
+		}
+
+		/* check for consistency with RDB defined CylBlocks */
+		if (cylblk > be32_to_cpu(rdb->rdb_CylBlocks)) {
+			pr_warn("Dev %s: cylblk %u > rdb_CylBlocks %u!\n",
+				state->disk->disk_name, cylblk,
+				be32_to_cpu(rdb->rdb_CylBlocks));
+		}
+
+		/* RDB allows for variable logical block size -
+		 * normalize to 512 byte blocks and check result.
+		 */
+
+		if (check_mul_overflow(cylblk, blksize, &cylblk)) {
+			pr_err("Dev %s: partition %u bytes per cyl. overflows u32, skipping partition!\n",
+				state->disk->disk_name, part);
+			continue;
+		}
+
+		/* Calculate partition start and end. Limit of 32 bit on cylblk
+		 * guarantees no overflow occurs if LBD support is enabled.
+		 */
+
+		lo_cyl = be32_to_cpu(pb->pb_Environment[LO_CYL]);
+		start_sect = ((u64) lo_cyl * cylblk);
+
+		hi_cyl = be32_to_cpu(pb->pb_Environment[HI_CYL]);
+		nr_sects = (((u64) hi_cyl - lo_cyl + 1) * cylblk);
+
+		if (!nr_sects)
+			continue;
+
+		/* Warn user if partition end overflows u32 (AmigaDOS limit) */
+
+		if ((start_sect + nr_sects) > UINT_MAX) {
+			pr_warn("Dev %s: partition %u (%llu-%llu) needs 64 bit device support!\n",
+				state->disk->disk_name, part,
+				start_sect, start_sect + nr_sects);
+		}
+
+		if (check_add_overflow(start_sect, nr_sects, &end_sect)) {
+			pr_err("Dev %s: partition %u (%llu-%llu) needs LBD device support, skipping partition!\n",
+				state->disk->disk_name, part,
+				start_sect, end_sect);
+			continue;
+		}
+
+		/* Tell Kernel about it */
+
+		put_partition(state,slot++,start_sect,nr_sects);
+		{
+			/* Be even more informative to aid mounting */
+			char dostype[4];
+			char tmp[42];
+
+			__be32 *dt = (__be32 *)dostype;
+			*dt = pb->pb_Environment[16];
+			if (dostype[3] < ' ')
+				snprintf(tmp, sizeof(tmp), " (%c%c%c^%c)",
+					dostype[0], dostype[1],
+					dostype[2], dostype[3] + '@' );
+			else
+				snprintf(tmp, sizeof(tmp), " (%c%c%c%c)",
+					dostype[0], dostype[1],
+					dostype[2], dostype[3]);
+			strlcat(state->pp_buf, tmp, PAGE_SIZE);
+			snprintf(tmp, sizeof(tmp), "(res %d spb %d)",
+				be32_to_cpu(pb->pb_Environment[6]),
+				be32_to_cpu(pb->pb_Environment[4]));
+			strlcat(state->pp_buf, tmp, PAGE_SIZE);
+		}
+		res = 1;
+	}
+	strlcat(state->pp_buf, "\n", PAGE_SIZE);
+
+rdb_done:
+	return res;
+}