projects / people / ms / linux.git / blame
| Commit | Line | Data |
|---|---|---|
| b2441318 | 1 | // SPDX-License-Identifier: GPL-2.0 |
| 1da177e4 | 2 | #include <linux/buffer_head.h> |
| 5a0e3ad6 | 3 | #include <linux/slab.h> |
| 1da177e4 LT |
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) { | |
| a1c6f057 DM |
30 | printk("MINIX-fs: block_to_path: block %ld < 0 on dev %pg\n", |
| 31 | block, inode->i_sb->s_bdev); | |
| f666f9fb EB |
32 | return 0; |
| 33 | } | |
| 34 | if ((u64)block * BLOCK_SIZE >= inode->i_sb->s_maxbytes) | |
| 35 | return 0; | |
| 36 | ||
| 37 | if (block < 7) { | |
| 1da177e4 LT |
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 | ||
| 939b00df | 64 | unsigned V1_minix_blocks(loff_t size, struct super_block *sb) |
| 1da177e4 | 65 | { |
| 939b00df | 66 | return nblocks(size, sb); |
| 1da177e4 | 67 | } |