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 101da177e4SLinus Torvalds static inline unsigned long block_to_cpu(block_t n) 111da177e4SLinus Torvalds { 121da177e4SLinus Torvalds return n; 131da177e4SLinus Torvalds } 141da177e4SLinus Torvalds 151da177e4SLinus Torvalds static inline block_t cpu_to_block(unsigned long n) 161da177e4SLinus Torvalds { 171da177e4SLinus Torvalds return n; 181da177e4SLinus Torvalds } 191da177e4SLinus Torvalds 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 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 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 591da177e4SLinus Torvalds void V1_minix_truncate(struct inode * inode) 601da177e4SLinus Torvalds { 611da177e4SLinus Torvalds truncate(inode); 621da177e4SLinus Torvalds } 631da177e4SLinus Torvalds 64939b00dfSAndries Brouwer unsigned V1_minix_blocks(loff_t size, struct super_block *sb) 651da177e4SLinus Torvalds { 66939b00dfSAndries Brouwer return nblocks(size, sb); 671da177e4SLinus Torvalds } 68