1b2441318SGreg Kroah-Hartman // SPDX-License-Identifier: GPL-2.0
21da177e4SLinus Torvalds #include <linux/buffer_head.h>
35a0e3ad6STejun Heo #include <linux/slab.h>
41da177e4SLinus Torvalds #include "minix.h"
51da177e4SLinus Torvalds
61da177e4SLinus Torvalds enum {DEPTH = 3, DIRECT = 7}; /* Only double indirect */
71da177e4SLinus Torvalds
81da177e4SLinus Torvalds typedef u16 block_t; /* 16 bit, host order */
91da177e4SLinus Torvalds
block_to_cpu(block_t n)101da177e4SLinus Torvalds static inline unsigned long block_to_cpu(block_t n)
111da177e4SLinus Torvalds {
121da177e4SLinus Torvalds return n;
131da177e4SLinus Torvalds }
141da177e4SLinus Torvalds
cpu_to_block(unsigned long n)151da177e4SLinus Torvalds static inline block_t cpu_to_block(unsigned long n)
161da177e4SLinus Torvalds {
171da177e4SLinus Torvalds return n;
181da177e4SLinus Torvalds }
191da177e4SLinus Torvalds
i_data(struct inode * inode)201da177e4SLinus Torvalds static inline block_t *i_data(struct inode *inode)
211da177e4SLinus Torvalds {
221da177e4SLinus Torvalds return (block_t *)minix_i(inode)->u.i1_data;
231da177e4SLinus Torvalds }
241da177e4SLinus Torvalds
block_to_path(struct inode * inode,long block,int offsets[DEPTH])251da177e4SLinus Torvalds static int block_to_path(struct inode * inode, long block, int offsets[DEPTH])
261da177e4SLinus Torvalds {
271da177e4SLinus Torvalds int n = 0;
281da177e4SLinus Torvalds
291da177e4SLinus Torvalds if (block < 0) {
30a1c6f057SDmitry Monakhov printk("MINIX-fs: block_to_path: block %ld < 0 on dev %pg\n",
31a1c6f057SDmitry Monakhov block, inode->i_sb->s_bdev);
32*f666f9fbSEric Biggers return 0;
33*f666f9fbSEric Biggers }
34*f666f9fbSEric Biggers if ((u64)block * BLOCK_SIZE >= inode->i_sb->s_maxbytes)
35*f666f9fbSEric Biggers return 0;
36*f666f9fbSEric Biggers
37*f666f9fbSEric Biggers if (block < 7) {
381da177e4SLinus Torvalds offsets[n++] = block;
391da177e4SLinus Torvalds } else if ((block -= 7) < 512) {
401da177e4SLinus Torvalds offsets[n++] = 7;
411da177e4SLinus Torvalds offsets[n++] = block;
421da177e4SLinus Torvalds } else {
431da177e4SLinus Torvalds block -= 512;
441da177e4SLinus Torvalds offsets[n++] = 8;
451da177e4SLinus Torvalds offsets[n++] = block>>9;
461da177e4SLinus Torvalds offsets[n++] = block & 511;
471da177e4SLinus Torvalds }
481da177e4SLinus Torvalds return n;
491da177e4SLinus Torvalds }
501da177e4SLinus Torvalds
511da177e4SLinus Torvalds #include "itree_common.c"
521da177e4SLinus Torvalds
V1_minix_get_block(struct inode * inode,long block,struct buffer_head * bh_result,int create)531da177e4SLinus Torvalds int V1_minix_get_block(struct inode * inode, long block,
541da177e4SLinus Torvalds struct buffer_head *bh_result, int create)
551da177e4SLinus Torvalds {
561da177e4SLinus Torvalds return get_block(inode, block, bh_result, create);
571da177e4SLinus Torvalds }
581da177e4SLinus Torvalds
V1_minix_truncate(struct inode * inode)591da177e4SLinus Torvalds void V1_minix_truncate(struct inode * inode)
601da177e4SLinus Torvalds {
611da177e4SLinus Torvalds truncate(inode);
621da177e4SLinus Torvalds }
631da177e4SLinus Torvalds
V1_minix_blocks(loff_t size,struct super_block * sb)64939b00dfSAndries Brouwer unsigned V1_minix_blocks(loff_t size, struct super_block *sb)
651da177e4SLinus Torvalds {
66939b00dfSAndries Brouwer return nblocks(size, sb);
671da177e4SLinus Torvalds }
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