Orange Pi5 kernel

^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  1) // SPDX-License-Identifier: GPL-2.0
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  2) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  3)  *  fs/partitions/sgi.c
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  4)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  5)  *  Code extracted from drivers/block/genhd.c
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  6)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  7) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  8) #include "check.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  9) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10) #define SGI_LABEL_MAGIC 0x0be5a941
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12) enum {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13) 	LINUX_RAID_PARTITION = 0xfd,	/* autodetect RAID partition */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16) struct sgi_disklabel {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17) 	__be32 magic_mushroom;		/* Big fat spliff... */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18) 	__be16 root_part_num;		/* Root partition number */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19) 	__be16 swap_part_num;		/* Swap partition number */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20) 	s8 boot_file[16];		/* Name of boot file for ARCS */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21) 	u8 _unused0[48];		/* Device parameter useless crapola.. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22) 	struct sgi_volume {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23) 		s8 name[8];		/* Name of volume */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24) 		__be32 block_num;		/* Logical block number */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25) 		__be32 num_bytes;		/* How big, in bytes */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26) 	} volume[15];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27) 	struct sgi_partition {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28) 		__be32 num_blocks;		/* Size in logical blocks */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29) 		__be32 first_block;	/* First logical block */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30) 		__be32 type;		/* Type of this partition */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31) 	} partitions[16];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32) 	__be32 csum;			/* Disk label checksum */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33) 	__be32 _unused1;			/* Padding */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36) int sgi_partition(struct parsed_partitions *state)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38) 	int i, csum;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39) 	__be32 magic;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40) 	int slot = 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41) 	unsigned int start, blocks;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42) 	__be32 *ui, cs;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43) 	Sector sect;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44) 	struct sgi_disklabel *label;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45) 	struct sgi_partition *p;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46) 	char b[BDEVNAME_SIZE];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48) 	label = read_part_sector(state, 0, &sect);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49) 	if (!label)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50) 		return -1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51) 	p = &label->partitions[0];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52) 	magic = label->magic_mushroom;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53) 	if(be32_to_cpu(magic) != SGI_LABEL_MAGIC) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54) 		/*printk("Dev %s SGI disklabel: bad magic %08x\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55) 		       bdevname(bdev, b), be32_to_cpu(magic));*/
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56) 		put_dev_sector(sect);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57) 		return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 59) 	ui = ((__be32 *) (label + 1)) - 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 60) 	for(csum = 0; ui >= ((__be32 *) label);) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 61) 		cs = *ui--;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 62) 		csum += be32_to_cpu(cs);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 63) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 64) 	if(csum) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 65) 		printk(KERN_WARNING "Dev %s SGI disklabel: csum bad, label corrupted\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 66) 		       bdevname(state->bdev, b));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 67) 		put_dev_sector(sect);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 68) 		return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 69) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 70) 	/* All SGI disk labels have 16 partitions, disks under Linux only
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 71) 	 * have 15 minor's.  Luckily there are always a few zero length
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 72) 	 * partitions which we don't care about so we never overflow the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 73) 	 * current_minor.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 74) 	 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 75) 	for(i = 0; i < 16; i++, p++) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 76) 		blocks = be32_to_cpu(p->num_blocks);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 77) 		start  = be32_to_cpu(p->first_block);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 78) 		if (blocks) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 79) 			put_partition(state, slot, start, blocks);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 80) 			if (be32_to_cpu(p->type) == LINUX_RAID_PARTITION)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 81) 				state->parts[slot].flags = ADDPART_FLAG_RAID;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 82) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 83) 		slot++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 84) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 85) 	strlcat(state->pp_buf, "\n", PAGE_SIZE);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 86) 	put_dev_sector(sect);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 87) 	return 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 88) }