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