1*b2441318SGreg Kroah-Hartman // SPDX-License-Identifier: GPL-2.0 21da177e4SLinus Torvalds #include <linux/buffer_head.h> 31da177e4SLinus Torvalds #include "minix.h" 41da177e4SLinus Torvalds 51da177e4SLinus Torvalds enum {DIRECT = 7, DEPTH = 4}; /* Have triple indirect */ 61da177e4SLinus Torvalds 71da177e4SLinus Torvalds typedef u32 block_t; /* 32 bit, host order */ 81da177e4SLinus Torvalds 91da177e4SLinus Torvalds static inline unsigned long block_to_cpu(block_t n) 101da177e4SLinus Torvalds { 111da177e4SLinus Torvalds return n; 121da177e4SLinus Torvalds } 131da177e4SLinus Torvalds 141da177e4SLinus Torvalds static inline block_t cpu_to_block(unsigned long n) 151da177e4SLinus Torvalds { 161da177e4SLinus Torvalds return n; 171da177e4SLinus Torvalds } 181da177e4SLinus Torvalds 191da177e4SLinus Torvalds static inline block_t *i_data(struct inode *inode) 201da177e4SLinus Torvalds { 211da177e4SLinus Torvalds return (block_t *)minix_i(inode)->u.i2_data; 221da177e4SLinus Torvalds } 231da177e4SLinus Torvalds 240ab7620aSErik van der Kouwe #define DIRCOUNT 7 250ab7620aSErik van der Kouwe #define INDIRCOUNT(sb) (1 << ((sb)->s_blocksize_bits - 2)) 260ab7620aSErik van der Kouwe 271da177e4SLinus Torvalds static int block_to_path(struct inode * inode, long block, int offsets[DEPTH]) 281da177e4SLinus Torvalds { 291da177e4SLinus Torvalds int n = 0; 30939b00dfSAndries Brouwer struct super_block *sb = inode->i_sb; 311da177e4SLinus Torvalds 321da177e4SLinus Torvalds if (block < 0) { 33a1c6f057SDmitry Monakhov printk("MINIX-fs: block_to_path: block %ld < 0 on dev %pg\n", 34a1c6f057SDmitry Monakhov block, sb->s_bdev); 356ed6a722SVladimir Serbinenko } else if ((u64)block * (u64)sb->s_blocksize >= 366ed6a722SVladimir Serbinenko minix_sb(sb)->s_max_size) { 37f44ec6f3SEric Sandeen if (printk_ratelimit()) 38f44ec6f3SEric Sandeen printk("MINIX-fs: block_to_path: " 39a1c6f057SDmitry Monakhov "block %ld too big on dev %pg\n", 40a1c6f057SDmitry Monakhov block, sb->s_bdev); 410ab7620aSErik van der Kouwe } else if (block < DIRCOUNT) { 421da177e4SLinus Torvalds offsets[n++] = block; 430ab7620aSErik van der Kouwe } else if ((block -= DIRCOUNT) < INDIRCOUNT(sb)) { 440ab7620aSErik van der Kouwe offsets[n++] = DIRCOUNT; 451da177e4SLinus Torvalds offsets[n++] = block; 460ab7620aSErik van der Kouwe } else if ((block -= INDIRCOUNT(sb)) < INDIRCOUNT(sb) * INDIRCOUNT(sb)) { 470ab7620aSErik van der Kouwe offsets[n++] = DIRCOUNT + 1; 480ab7620aSErik van der Kouwe offsets[n++] = block / INDIRCOUNT(sb); 490ab7620aSErik van der Kouwe offsets[n++] = block % INDIRCOUNT(sb); 501da177e4SLinus Torvalds } else { 510ab7620aSErik van der Kouwe block -= INDIRCOUNT(sb) * INDIRCOUNT(sb); 520ab7620aSErik van der Kouwe offsets[n++] = DIRCOUNT + 2; 530ab7620aSErik van der Kouwe offsets[n++] = (block / INDIRCOUNT(sb)) / INDIRCOUNT(sb); 540ab7620aSErik van der Kouwe offsets[n++] = (block / INDIRCOUNT(sb)) % INDIRCOUNT(sb); 550ab7620aSErik van der Kouwe offsets[n++] = block % INDIRCOUNT(sb); 561da177e4SLinus Torvalds } 571da177e4SLinus Torvalds return n; 581da177e4SLinus Torvalds } 591da177e4SLinus Torvalds 601da177e4SLinus Torvalds #include "itree_common.c" 611da177e4SLinus Torvalds 621da177e4SLinus Torvalds int V2_minix_get_block(struct inode * inode, long block, 631da177e4SLinus Torvalds struct buffer_head *bh_result, int create) 641da177e4SLinus Torvalds { 651da177e4SLinus Torvalds return get_block(inode, block, bh_result, create); 661da177e4SLinus Torvalds } 671da177e4SLinus Torvalds 681da177e4SLinus Torvalds void V2_minix_truncate(struct inode * inode) 691da177e4SLinus Torvalds { 701da177e4SLinus Torvalds truncate(inode); 711da177e4SLinus Torvalds } 721da177e4SLinus Torvalds 73939b00dfSAndries Brouwer unsigned V2_minix_blocks(loff_t size, struct super_block *sb) 741da177e4SLinus Torvalds { 75939b00dfSAndries Brouwer return nblocks(size, sb); 761da177e4SLinus Torvalds } 77