static int nilfs_direct_insert(struct nilfs_bmap *bmap, __u64 key, __u64 ptr)
{
union nilfs_bmap_ptr_req req;
struct inode *dat = NULL;
struct buffer_head *bh;
int ret;
if (key > NILFS_DIRECT_KEY_MAX)
return -ENOENT;
if (nilfs_direct_get_ptr(bmap, key) != NILFS_BMAP_INVALID_PTR)
return -EEXIST;
if (NILFS_BMAP_USE_VBN(bmap)) {
req.bpr_ptr = nilfs_direct_find_target_v(bmap, key);
dat = nilfs_bmap_get_dat(bmap);
}
ret = nilfs_bmap_prepare_alloc_ptr(bmap, &req, dat);
if (!ret) {
/* ptr must be a pointer to a buffer head. */
bh = (struct buffer_head *)((unsigned long)ptr);
set_buffer_nilfs_volatile(bh);
nilfs_bmap_commit_alloc_ptr(bmap, &req, dat);
nilfs_direct_set_ptr(bmap, key, req.bpr_ptr);
if (!nilfs_bmap_dirty(bmap))
nilfs_bmap_set_dirty(bmap);
if (NILFS_BMAP_USE_VBN(bmap))
nilfs_bmap_set_target_v(bmap, key, req.bpr_ptr);
nilfs_inode_add_blocks(bmap->b_inode, 1);
}
return ret;
}
/**
* nilfs_bmap_test_and_clear_dirty - test and clear a bmap dirty state
* @bmap: bmap
*
* Description: nilfs_test_and_clear() is the atomic operation to test and
* clear the dirty state of @bmap.
*
* Return Value: 1 is returned if @bmap is dirty, or 0 if clear.
*/
int nilfs_bmap_test_and_clear_dirty(struct nilfs_bmap *bmap)
{
int ret;
down_write(&bmap->b_sem);
ret = nilfs_bmap_dirty(bmap);
nilfs_bmap_clear_dirty(bmap);
up_write(&bmap->b_sem);
return ret;
}
static void nilfs_direct_commit_insert(struct nilfs_direct *direct,
union nilfs_bmap_ptr_req *req,
__u64 key, __u64 ptr)
{
struct buffer_head *bh;
/* ptr must be a pointer to a buffer head. */
bh = (struct buffer_head *)((unsigned long)ptr);
set_buffer_nilfs_volatile(bh);
nilfs_bmap_commit_alloc_ptr(&direct->d_bmap, req);
nilfs_direct_set_ptr(direct, key, req->bpr_ptr);
if (!nilfs_bmap_dirty(&direct->d_bmap))
nilfs_bmap_set_dirty(&direct->d_bmap);
if (NILFS_BMAP_USE_VBN(&direct->d_bmap))
nilfs_direct_set_target_v(direct, key, req->bpr_ptr);
}
