fs/minix/itree_v2.c

   1 #include <linux/buffer_head.h>
   2 #include "minix.h"
   3
   4 enum {DIRECT = 7, DEPTH = 4};   /* Have triple indirect */
   5
   6 typedef u32 block_t;    /* 32 bit, host order */
   7
   8 static inline unsigned long block_to_cpu(block_t n)
   9 {
  10         return n;
  11 }
  12
  13 static inline block_t cpu_to_block(unsigned long n)
  14 {
  15         return n;
  16 }
  17
  18 static inline block_t *i_data(struct inode *inode)
  19 {
  20         return (block_t *)minix_i(inode)->u.i2_data;
  21 }
  22
  23 static int block_to_path(struct inode * inode, long block, int offsets[DEPTH])
  24 {
  25         int n = 0;
  26         char b[BDEVNAME_SIZE];
  27         struct super_block *sb = inode->i_sb;
  28
  29         if (block < 0) {
  30                 printk("MINIX-fs: block_to_path: block %ld < 0 on dev %s\n",
  31                         block, bdevname(sb->s_bdev, b));
  32         } else if (block >= (minix_sb(inode->i_sb)->s_max_size/sb->s_blocksize)) {
  33                 if (printk_ratelimit())
  34                         printk("MINIX-fs: block_to_path: "
  35                                "block %ld too big on dev %s\n",
  36                                 block, bdevname(sb->s_bdev, b));
  37         } else if (block < 7) {
  38                 offsets[n++] = block;
  39         } else if ((block -= 7) < 256) {
  40                 offsets[n++] = 7;
  41                 offsets[n++] = block;
  42         } else if ((block -= 256) < 256*256) {
  43                 offsets[n++] = 8;
  44                 offsets[n++] = block>>8;
  45                 offsets[n++] = block & 255;
  46         } else {
  47                 block -= 256*256;
  48                 offsets[n++] = 9;
  49                 offsets[n++] = block>>16;
  50                 offsets[n++] = (block>>8) & 255;
  51                 offsets[n++] = block & 255;
  52         }
  53         return n;
  54 }
  55
  56 #include "itree_common.c"
  57
  58 int V2_minix_get_block(struct inode * inode, long block,
  59                         struct buffer_head *bh_result, int create)
  60 {
  61         return get_block(inode, block, bh_result, create);
  62 }
  63
  64 void V2_minix_truncate(struct inode * inode)
  65 {
  66         truncate(inode);
  67 }
  68
  69 unsigned V2_minix_blocks(loff_t size, struct super_block *sb)
  70 {
  71         return nblocks(size, sb);
  72 }