/* Find a free entity in the bitmap starting at block BMAP-START on device
DEV which contains BMAP-LEN bits. Sets the free bit it finds then returns
the bit number, or NO_FREE_BLOCK if an error or all bits are set. */
blkno
bmap_alloc(struct fs_device *dev, blkno bmap_start, u_long bmap_len)
{
blkno bmap_blk = bmap_start;
while(bmap_len > 0)
{
int len, bit;
struct buf_head *buf = bread(dev, bmap_blk);
if(buf == NULL)
return -1;
len = min(bmap_len, FS_BLKSIZ * 8);
FORBID();
bit = find_zero_bit(buf->buf.bmap, len);
if(bit != -1)
{
set_bit(buf->buf.bmap, bit);
PERMIT();
bdirty(buf, TRUE);
brelse(buf);
return ((bmap_blk - bmap_start) * FS_BLKSIZ * 8) + bit;
}
PERMIT();
brelse(buf);
bmap_len -= len;
bmap_blk++;
}
ERRNO = E_NOSPC;
return NO_FREE_BLOCK;
}
bool FORTE_RT_E_PERMIT::checkActivation(int ){
return PERMIT();
}
