fs/minix: bugfix, number of indirect block ptrs per block depends on block size

[safe/jmp/linux-2.6] / fs / minix / itree_v2.c

diff --git a/fs/minix/itree_v2.c b/fs/minix/itree_v2.c
index f230109..13487ad 100644 (file)
--- a/fs/minix/itree_v2.c
+++ b/fs/minix/itree_v2.c
@@ -20,6 +20,9 @@ static inline block_t *i_data(struct inode *inode)
        return (block_t *)minix_i(inode)->u.i2_data;
 }
 
+#define DIRCOUNT 7
+#define INDIRCOUNT(sb) (1 << ((sb)->s_blocksize_bits - 2))
+
 static int block_to_path(struct inode * inode, long block, int offsets[DEPTH])
 {
        int n = 0;
@@ -34,21 +37,21 @@ static int block_to_path(struct inode * inode, long block, int offsets[DEPTH])
                        printk("MINIX-fs: block_to_path: "
                               "block %ld too big on dev %s\n",
                                block, bdevname(sb->s_bdev, b));
-       } else if (block < 7) {
+       } else if (block < DIRCOUNT) {
                offsets[n++] = block;
-       } else if ((block -= 7) < 256) {
-               offsets[n++] = 7;
+       } else if ((block -= DIRCOUNT) < INDIRCOUNT(sb)) {
+               offsets[n++] = DIRCOUNT;
                offsets[n++] = block;
-       } else if ((block -= 256) < 256*256) {
-               offsets[n++] = 8;
-               offsets[n++] = block>>8;
-               offsets[n++] = block & 255;
+       } else if ((block -= INDIRCOUNT(sb)) < INDIRCOUNT(sb) * INDIRCOUNT(sb)) {
+               offsets[n++] = DIRCOUNT + 1;
+               offsets[n++] = block / INDIRCOUNT(sb);
+               offsets[n++] = block % INDIRCOUNT(sb);
        } else {
-               block -= 256*256;
-               offsets[n++] = 9;
-               offsets[n++] = block>>16;
-               offsets[n++] = (block>>8) & 255;
-               offsets[n++] = block & 255;
+               block -= INDIRCOUNT(sb) * INDIRCOUNT(sb);
+               offsets[n++] = DIRCOUNT + 2;
+               offsets[n++] = (block / INDIRCOUNT(sb)) / INDIRCOUNT(sb);
+               offsets[n++] = (block / INDIRCOUNT(sb)) % INDIRCOUNT(sb);
+               offsets[n++] = block % INDIRCOUNT(sb);
        }
        return n;
 }