struct buffer_head *blockdirty(struct buffer_head *buffer, unsigned newdelta)
{
map_t *map = buffer->map;
assert(buffer->state < BUFFER_STATES);
buftrace("---- before: fork buffer %p ----", buffer);
if (buffer_dirty(buffer)) {
if (buffer_already_dirty(buffer, newdelta))
return buffer;
/* Buffer can't modify already, we have to fork buffer */
buftrace("---- fork buffer %p ----", buffer);
struct buffer_head *clone = new_buffer(map);
if (IS_ERR(clone))
return clone;
/* Create the cloned buffer */
memcpy(bufdata(clone), bufdata(buffer), bufsize(buffer));
clone->index = buffer->index;
/* Replace the buffer by cloned buffer. */
remove_buffer_hash(buffer);
insert_buffer_hash(clone);
/*
* The refcount of buffer is used for backend. So, the
* backend has to free this buffer (blockput(buffer))
*/
buffer = clone;
}
__tux3_mark_buffer_dirty(buffer, newdelta);
return buffer;
}
static int bnode_need_redirect(struct sb *sb, struct buffer_head *buffer)
{
if(DEBUG_MODE_K==1)
{
printf("\t\t\t\t%25s[K] %25s %4d #in\n",__FILE__,__func__,__LINE__);
}
/* If this is not re-dirty for sb->unify, we need to redirect */
return !buffer_already_dirty(buffer, sb->unify);
}
static int bnode_need_redirect(struct sb *sb, struct buffer_head *buffer)
{
/* If this is not re-dirty for sb->rollup, we need to redirect */
return !buffer_already_dirty(buffer, sb->rollup);
}
