buf_s *alloc_block (dev_s *dev)
{
super_s *super;
buf_s *buf;
u64 blknum;
FN;
buf = bget(dev, SUPER_BLOCK);
super = buf->b_data;
if (super->sp_magic != SUPER_MAGIC) {
eprintf("no super block");
}
blknum = super->sp_next++;
bdirty(buf);
bput(buf);
return bnew(dev, blknum);
}
/*
* Search for a buffer, by name.
* If not found, and the "cflag" is TRUE,
* create a new buffer. Return pointer to the found
* (or new) buffer.
*/
struct buffer *
bfind(const char *bname, int cflag)
{
struct buffer *bp;
bp = bheadp;
while (bp != NULL) {
if (strcmp(bname, bp->b_bname) == 0)
return (bp);
bp = bp->b_bufp;
}
if (cflag != TRUE)
return (NULL);
bp = bnew(bname);
return (bp);
}
static void init_super_block (tree_s *tree)
{
super_s *super;
buf_s *buf;
buf = bget(tree->t_dev, SUPER_BLOCK);
if (!buf) {
buf = bnew(tree->t_dev, SUPER_BLOCK);
}
super = buf->b_data;
if (super->sp_magic != SUPER_MAGIC) {
super->sp_blknum = SUPER_BLOCK;
super->sp_magic = SUPER_MAGIC;
super->sp_root = 0;
super->sp_next = SUPER_BLOCK + 1;
bdirty(buf);
}
bput(buf);
}