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 "minix.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  4) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  5) enum {DIRECT = 7, DEPTH = 4};	/* Have triple indirect */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  6) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  7) typedef u32 block_t;	/* 32 bit, host order */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  8) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  9) static inline unsigned long block_to_cpu(block_t n)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11) 	return n;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14) static inline block_t cpu_to_block(unsigned long n)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16) 	return n;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19) static inline block_t *i_data(struct inode *inode)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21) 	return (block_t *)minix_i(inode)->u.i2_data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24) #define DIRCOUNT 7
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25) #define INDIRCOUNT(sb) (1 << ((sb)->s_blocksize_bits - 2))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27) static int block_to_path(struct inode * inode, long block, int offsets[DEPTH])
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29) 	int n = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30) 	struct super_block *sb = inode->i_sb;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32) 	if (block < 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33) 		printk("MINIX-fs: block_to_path: block %ld < 0 on dev %pg\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34) 			block, sb->s_bdev);
^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 ((u64)block * (u64)sb->s_blocksize >= sb->s_maxbytes)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38) 		return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40) 	if (block < DIRCOUNT) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41) 		offsets[n++] = block;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42) 	} else if ((block -= DIRCOUNT) < INDIRCOUNT(sb)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43) 		offsets[n++] = DIRCOUNT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44) 		offsets[n++] = block;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45) 	} else if ((block -= INDIRCOUNT(sb)) < INDIRCOUNT(sb) * INDIRCOUNT(sb)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46) 		offsets[n++] = DIRCOUNT + 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47) 		offsets[n++] = block / INDIRCOUNT(sb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48) 		offsets[n++] = block % INDIRCOUNT(sb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49) 	} else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50) 		block -= INDIRCOUNT(sb) * INDIRCOUNT(sb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51) 		offsets[n++] = DIRCOUNT + 2;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52) 		offsets[n++] = (block / INDIRCOUNT(sb)) / INDIRCOUNT(sb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53) 		offsets[n++] = (block / INDIRCOUNT(sb)) % INDIRCOUNT(sb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54) 		offsets[n++] = block % INDIRCOUNT(sb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56) 	return n;
^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) #include "itree_common.c"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 60) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 61) int V2_minix_get_block(struct inode * inode, long block,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 62) 			struct buffer_head *bh_result, int create)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 63) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 64) 	return get_block(inode, block, bh_result, create);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 65) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 66) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 67) void V2_minix_truncate(struct inode * inode)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 68) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 69) 	truncate(inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 70) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 71) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 72) unsigned V2_minix_blocks(loff_t size, struct super_block *sb)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 73) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 74) 	return nblocks(size, sb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 75) }