mirror of https://github.com/Qortal/Brooklyn
You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
75 lines
1.7 KiB
75 lines
1.7 KiB
// 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); |
|
return 0; |
|
} |
|
if ((u64)block * (u64)sb->s_blocksize >= sb->s_maxbytes) |
|
return 0; |
|
|
|
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); |
|
}
|
|
|