1#include <linux/buffer_head.h> 2#include "minix.h" 3 4enum {DIRECT = 7, DEPTH = 4}; /* Have triple indirect */ 5 6typedef u32 block_t; /* 32 bit, host order */ 7 8static inline unsigned long block_to_cpu(block_t n) 9{ 10 return n; 11} 12 13static inline block_t cpu_to_block(unsigned long n) 14{ 15 return n; 16} 17 18static inline block_t *i_data(struct inode *inode) 19{ 20 return (block_t *)minix_i(inode)->u.i2_data; 21} 22 23#define DIRCOUNT 7 24#define INDIRCOUNT(sb) (1 << ((sb)->s_blocksize_bits - 2)) 25 26static int block_to_path(struct inode * inode, long block, int offsets[DEPTH]) 27{ 28 int n = 0; 29 char b[BDEVNAME_SIZE]; 30 struct super_block *sb = inode->i_sb; 31 32 if (block < 0) { 33 printk("MINIX-fs: block_to_path: block %ld < 0 on dev %s\n", 34 block, bdevname(sb->s_bdev, b)); 35 } else if (block >= (minix_sb(inode->i_sb)->s_max_size/sb->s_blocksize)) { 36 if (printk_ratelimit()) 37 printk("MINIX-fs: block_to_path: " 38 "block %ld too big on dev %s\n", 39 block, bdevname(sb->s_bdev, b)); 40 } else if (block < DIRCOUNT) { 41 offsets[n++] = block; 42 } else if ((block -= DIRCOUNT) < INDIRCOUNT(sb)) { 43 offsets[n++] = DIRCOUNT; 44 offsets[n++] = block; 45 } else if ((block -= INDIRCOUNT(sb)) < INDIRCOUNT(sb) * INDIRCOUNT(sb)) { 46 offsets[n++] = DIRCOUNT + 1; 47 offsets[n++] = block / INDIRCOUNT(sb); 48 offsets[n++] = block % INDIRCOUNT(sb); 49 } else { 50 block -= INDIRCOUNT(sb) * INDIRCOUNT(sb); 51 offsets[n++] = DIRCOUNT + 2; 52 offsets[n++] = (block / INDIRCOUNT(sb)) / INDIRCOUNT(sb); 53 offsets[n++] = (block / INDIRCOUNT(sb)) % INDIRCOUNT(sb); 54 offsets[n++] = block % INDIRCOUNT(sb); 55 } 56 return n; 57} 58 59#include "itree_common.c" 60 61int V2_minix_get_block(struct inode * inode, long block, 62 struct buffer_head *bh_result, int create) 63{ 64 return get_block(inode, block, bh_result, create); 65} 66 67void V2_minix_truncate(struct inode * inode) 68{ 69 truncate(inode); 70} 71 72unsigned V2_minix_blocks(loff_t size, struct super_block *sb) 73{ 74 return nblocks(size, sb); 75} 76