1 // SPDX-License-Identifier: GPL-2.0 2 #include <linux/buffer_head.h> 3 #include <linux/slab.h> 4 #include "minix.h" 5 6 enum {DEPTH = 3, DIRECT = 7}; /* Only double indirect */ 7 8 typedef u16 block_t; /* 16 bit, host order */ 9 10 static inline unsigned long block_to_cpu(block_t n) 11 { 12 return n; 13 } 14 15 static inline block_t cpu_to_block(unsigned long n) 16 { 17 return n; 18 } 19 20 static inline block_t *i_data(struct inode *inode) 21 { 22 return (block_t *)minix_i(inode)->u.i1_data; 23 } 24 25 static int block_to_path(struct inode * inode, long block, int offsets[DEPTH]) 26 { 27 int n = 0; 28 29 if (block < 0) { 30 printk("MINIX-fs: block_to_path: block %ld < 0 on dev %pg\n", 31 block, inode->i_sb->s_bdev); 32 return 0; 33 } 34 if ((u64)block * BLOCK_SIZE >= inode->i_sb->s_maxbytes) 35 return 0; 36 37 if (block < 7) { 38 offsets[n++] = block; 39 } else if ((block -= 7) < 512) { 40 offsets[n++] = 7; 41 offsets[n++] = block; 42 } else { 43 block -= 512; 44 offsets[n++] = 8; 45 offsets[n++] = block>>9; 46 offsets[n++] = block & 511; 47 } 48 return n; 49 } 50 51 #include "itree_common.c" 52 53 int V1_minix_get_block(struct inode * inode, long block, 54 struct buffer_head *bh_result, int create) 55 { 56 return get_block(inode, block, bh_result, create); 57 } 58 59 void V1_minix_truncate(struct inode * inode) 60 { 61 truncate(inode); 62 } 63 64 unsigned V1_minix_blocks(loff_t size, struct super_block *sb) 65 { 66 return nblocks(size, sb); 67 } 68