void set_blocksize(dev_t dev, int size)
{
int i;
struct buffer_head * bh, *bhnext;
if (!blksize_size[MAJOR(dev)])
return;
switch(size) {
default: panic("Invalid blocksize passed to set_blocksize");
case 512: case 1024: case 2048: case 4096:;
}
if (blksize_size[MAJOR(dev)][MINOR(dev)] == 0 && size == BLOCK_SIZE) {
blksize_size[MAJOR(dev)][MINOR(dev)] = size;
return;
}
if (blksize_size[MAJOR(dev)][MINOR(dev)] == size)
return;
sync_buffers(dev, 2);
blksize_size[MAJOR(dev)][MINOR(dev)] = size;
/* We need to be quite careful how we do this - we are moving entries
around on the free list, and we can get in a loop if we are not careful.*/
bh = free_list;
for (i = nr_buffers*2 ; --i > 0 ; bh = bhnext) {
bhnext = bh->b_next_free;
if (bh->b_dev != dev)
continue;
if (bh->b_size == size)
continue;
wait_on_buffer(bh);
if (bh->b_dev == dev && bh->b_size != size)
bh->b_uptodate = bh->b_dirt = 0;
remove_from_hash_queue(bh);
/* put_first_free(bh); */
}
}
static inline void remove_from_queues(struct buffer_head * bh)
{
remove_from_hash_queue(bh);
remove_from_free_list(bh);
}
