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) #include <linux/buffer_head.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  3) #include <linux/slab.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  4) #include "minix.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  5) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  6) enum {DEPTH = 3, DIRECT = 7};	/* Only double indirect */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  7) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  8) typedef u16 block_t;	/* 16 bit, host order */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  9) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10) static inline unsigned long block_to_cpu(block_t n)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12) 	return n;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15) static inline block_t cpu_to_block(unsigned long n)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17) 	return n;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20) static inline block_t *i_data(struct inode *inode)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22) 	return (block_t *)minix_i(inode)->u.i1_data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25) static int block_to_path(struct inode * inode, long block, int offsets[DEPTH])
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27) 	int n = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29) 	if (block < 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30) 		printk("MINIX-fs: block_to_path: block %ld < 0 on dev %pg\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31) 			block, inode->i_sb->s_bdev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32) 		return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34) 	if ((u64)block * BLOCK_SIZE >= inode->i_sb->s_maxbytes)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35) 		return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37) 	if (block < 7) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38) 		offsets[n++] = block;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39) 	} else if ((block -= 7) < 512) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40) 		offsets[n++] = 7;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41) 		offsets[n++] = block;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42) 	} else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43) 		block -= 512;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44) 		offsets[n++] = 8;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45) 		offsets[n++] = block>>9;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46) 		offsets[n++] = block & 511;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48) 	return n;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51) #include "itree_common.c"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53) int V1_minix_get_block(struct inode * inode, long block,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54) 			struct buffer_head *bh_result, int create)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56) 	return get_block(inode, block, bh_result, create);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 59) void V1_minix_truncate(struct inode * inode)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 60) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 61) 	truncate(inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 62) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 63) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 64) unsigned V1_minix_blocks(loff_t size, struct super_block *sb)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 65) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 66) 	return nblocks(size, sb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 67) }