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Linux/fs/minix/itree_v1.c

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  1 // SPDX-License-Identifier: GPL-2.0
  2 #include <linux/buffer_head.h>
  3 #include <linux/slab.h>
  4 #include "minix.h"
  5 
  6 enum {DEPTH = 3, DIRECT = 7};   /* Only double indirect */
  7 
  8 typedef u16 block_t;    /* 16 bit, host order */
  9 
 10 static inline unsigned long block_to_cpu(block_t n)
 11 {
 12         return n;
 13 }
 14 
 15 static inline block_t cpu_to_block(unsigned long n)
 16 {
 17         return n;
 18 }
 19 
 20 static inline block_t *i_data(struct inode *inode)
 21 {
 22         return (block_t *)minix_i(inode)->u.i1_data;
 23 }
 24 
 25 static int block_to_path(struct inode * inode, long block, int offsets[DEPTH])
 26 {
 27         int n = 0;
 28 
 29         if (block < 0) {
 30                 printk("MINIX-fs: block_to_path: block %ld < 0 on dev %pg\n",
 31                         block, inode->i_sb->s_bdev);
 32         } else if (block >= (minix_sb(inode->i_sb)->s_max_size/BLOCK_SIZE)) {
 33                 if (printk_ratelimit())
 34                         printk("MINIX-fs: block_to_path: "
 35                                "block %ld too big on dev %pg\n",
 36                                 block, inode->i_sb->s_bdev);
 37         } else if (block < 7) {
 38                 offsets[n++] = block;
 39         } else if ((block -= 7) < 512) {
 40                 offsets[n++] = 7;
 41                 offsets[n++] = block;
 42         } else {
 43                 block -= 512;
 44                 offsets[n++] = 8;
 45                 offsets[n++] = block>>9;
 46                 offsets[n++] = block & 511;
 47         }
 48         return n;
 49 }
 50 
 51 #include "itree_common.c"
 52 
 53 int V1_minix_get_block(struct inode * inode, long block,
 54                         struct buffer_head *bh_result, int create)
 55 {
 56         return get_block(inode, block, bh_result, create);
 57 }
 58 
 59 void V1_minix_truncate(struct inode * inode)
 60 {
 61         truncate(inode);
 62 }
 63 
 64 unsigned V1_minix_blocks(loff_t size, struct super_block *sb)
 65 {
 66         return nblocks(size, sb);
 67 }
 68 

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