projects / linux.git / blame
| Commit | Line | Data |
|---|---|---|
| 1da177e4 LT |
1 | #include <linux/buffer_head.h> |
| 2 | #include "minix.h" | |
| 3 | ||
| 4 | enum {DIRECT = 7, DEPTH = 4}; /* Have triple indirect */ | |
| 5 | ||
| 6 | typedef u32 block_t; /* 32 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.i2_data; | |
| 21 | } | |
| 22 | ||
| 23 | static int block_to_path(struct inode * inode, long block, int offsets[DEPTH]) | |
| 24 | { | |
| 25 | int n = 0; | |
| f44ec6f3 | 26 | char b[BDEVNAME_SIZE]; |
| 939b00df | 27 | struct super_block *sb = inode->i_sb; |
| 1da177e4 LT |
28 | |
| 29 | if (block < 0) { | |
| f44ec6f3 ES |
30 | printk("MINIX-fs: block_to_path: block %ld < 0 on dev %s\n", |
| 31 | block, bdevname(sb->s_bdev, b)); | |
| 939b00df | 32 | } else if (block >= (minix_sb(inode->i_sb)->s_max_size/sb->s_blocksize)) { |
| f44ec6f3 ES |
33 | if (printk_ratelimit()) |
| 34 | printk("MINIX-fs: block_to_path: " | |
| 35 | "block %ld too big on dev %s\n", | |
| 36 | block, bdevname(sb->s_bdev, b)); | |
| 1da177e4 LT |
37 | } else if (block < 7) { |
| 38 | offsets[n++] = block; | |
| 39 | } else if ((block -= 7) < 256) { | |
| 40 | offsets[n++] = 7; | |
| 41 | offsets[n++] = block; | |
| 42 | } else if ((block -= 256) < 256*256) { | |
| 43 | offsets[n++] = 8; | |
| 44 | offsets[n++] = block>>8; | |
| 45 | offsets[n++] = block & 255; | |
| 46 | } else { | |
| 47 | block -= 256*256; | |
| 48 | offsets[n++] = 9; | |
| 49 | offsets[n++] = block>>16; | |
| 50 | offsets[n++] = (block>>8) & 255; | |
| 51 | offsets[n++] = block & 255; | |
| 52 | } | |
| 53 | return n; | |
| 54 | } | |
| 55 | ||
| 56 | #include "itree_common.c" | |
| 57 | ||
| 58 | int V2_minix_get_block(struct inode * inode, long block, | |
| 59 | struct buffer_head *bh_result, int create) | |
| 60 | { | |
| 61 | return get_block(inode, block, bh_result, create); | |
| 62 | } | |
| 63 | ||
| 64 | void V2_minix_truncate(struct inode * inode) | |
| 65 | { | |
| 66 | truncate(inode); | |
| 67 | } | |
| 68 | ||
| 939b00df | 69 | unsigned V2_minix_blocks(loff_t size, struct super_block *sb) |
| 1da177e4 | 70 | { |
| 939b00df | 71 | return nblocks(size, sb); |
| 1da177e4 | 72 | } |