77 lines
1.9 KiB
C
77 lines
1.9 KiB
C
// SPDX-License-Identifier: GPL-2.0
|
|
#include <linux/buffer_head.h>
|
|
#include "minix.h"
|
|
|
|
enum {DIRECT = 7, DEPTH = 4}; /* Have triple indirect */
|
|
|
|
typedef u32 block_t; /* 32 bit, host order */
|
|
|
|
static inline unsigned long block_to_cpu(block_t n)
|
|
{
|
|
return n;
|
|
}
|
|
|
|
static inline block_t cpu_to_block(unsigned long n)
|
|
{
|
|
return n;
|
|
}
|
|
|
|
static inline block_t *i_data(struct inode *inode)
|
|
{
|
|
return (block_t *)minix_i(inode)->u.i2_data;
|
|
}
|
|
|
|
#define DIRCOUNT 7
|
|
#define INDIRCOUNT(sb) (1 << ((sb)->s_blocksize_bits - 2))
|
|
|
|
static int block_to_path(struct inode * inode, long block, int offsets[DEPTH])
|
|
{
|
|
int n = 0;
|
|
struct super_block *sb = inode->i_sb;
|
|
|
|
if (block < 0) {
|
|
printk("MINIX-fs: block_to_path: block %ld < 0 on dev %pg\n",
|
|
block, sb->s_bdev);
|
|
} else if ((u64)block * (u64)sb->s_blocksize >=
|
|
minix_sb(sb)->s_max_size) {
|
|
if (printk_ratelimit())
|
|
printk("MINIX-fs: block_to_path: "
|
|
"block %ld too big on dev %pg\n",
|
|
block, sb->s_bdev);
|
|
} else if (block < DIRCOUNT) {
|
|
offsets[n++] = block;
|
|
} else if ((block -= DIRCOUNT) < INDIRCOUNT(sb)) {
|
|
offsets[n++] = DIRCOUNT;
|
|
offsets[n++] = block;
|
|
} else if ((block -= INDIRCOUNT(sb)) < INDIRCOUNT(sb) * INDIRCOUNT(sb)) {
|
|
offsets[n++] = DIRCOUNT + 1;
|
|
offsets[n++] = block / INDIRCOUNT(sb);
|
|
offsets[n++] = block % INDIRCOUNT(sb);
|
|
} else {
|
|
block -= INDIRCOUNT(sb) * INDIRCOUNT(sb);
|
|
offsets[n++] = DIRCOUNT + 2;
|
|
offsets[n++] = (block / INDIRCOUNT(sb)) / INDIRCOUNT(sb);
|
|
offsets[n++] = (block / INDIRCOUNT(sb)) % INDIRCOUNT(sb);
|
|
offsets[n++] = block % INDIRCOUNT(sb);
|
|
}
|
|
return n;
|
|
}
|
|
|
|
#include "itree_common.c"
|
|
|
|
int V2_minix_get_block(struct inode * inode, long block,
|
|
struct buffer_head *bh_result, int create)
|
|
{
|
|
return get_block(inode, block, bh_result, create);
|
|
}
|
|
|
|
void V2_minix_truncate(struct inode * inode)
|
|
{
|
|
truncate(inode);
|
|
}
|
|
|
|
unsigned V2_minix_blocks(loff_t size, struct super_block *sb)
|
|
{
|
|
return nblocks(size, sb);
|
|
}
|