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add leaf data casting helper

This commit is contained in:
Chris Mason 2007-03-14 10:31:29 -04:00 committed by David Woodhouse
parent 0975c87bce
commit 942050de0e
3 changed files with 8 additions and 9 deletions
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4
ctree.h
View File

@ -401,6 +401,10 @@ static inline void btrfs_set_super_blocksize(struct btrfs_super_block *s,
s->blocksize = cpu_to_le16(val);
}
/* helper function to cast into the data area of the leaf. */
#define btrfs_item_ptr(leaf, slot, type) \
((type *)((leaf)->data + btrfs_item_offset((leaf)->items + (slot))))
struct btrfs_buffer *btrfs_alloc_free_block(struct btrfs_root *root);
int btrfs_inc_ref(struct btrfs_root *root, struct btrfs_buffer *buf);
int btrfs_free_extent(struct btrfs_root *root, u64 blocknr, u64 num_blocks);

8
extent-tree.c
View File

@ -41,9 +41,7 @@ static int inc_block_ref(struct btrfs_root *root, u64 blocknr)
BUG();
BUG_ON(ret != 0);
l = &path.nodes[0]->leaf;
item = (struct btrfs_extent_item *)(l->data +
btrfs_item_offset(l->items +
path.slots[0]));
item = btrfs_item_ptr(l, path.slots[0], struct btrfs_extent_item);
refs = btrfs_extent_refs(item);
btrfs_set_extent_refs(item, refs + 1);
@ -69,9 +67,7 @@ static int lookup_block_ref(struct btrfs_root *root, u64 blocknr, u32 *refs)
if (ret != 0)
BUG();
l = &path.nodes[0]->leaf;
item = (struct btrfs_extent_item *)(l->data +
btrfs_item_offset(l->items +
path.slots[0]));
item = btrfs_item_ptr(l, path.slots[0], struct btrfs_extent_item);
*refs = btrfs_extent_refs(item);
btrfs_release_path(root->extent_root, &path);
return 0;

5
print-tree.c
View File

@ -26,11 +26,10 @@ void btrfs_print_leaf(struct btrfs_leaf *l)
btrfs_item_size(item));
printf("\t\titem data %.*s\n", btrfs_item_size(item),
l->data + btrfs_item_offset(item));
ei = (struct btrfs_extent_item *)(l->data +
btrfs_item_offset(item));
ei = btrfs_item_ptr(l, i, struct btrfs_extent_item);
printf("\t\textent data refs %u owner %Lu\n",
btrfs_extent_refs(ei), btrfs_extent_owner(ei));
ri = (struct btrfs_root_item *)ei;
ri = btrfs_item_ptr(l, i, struct btrfs_root_item);
printf("\t\troot data blocknr %Lu refs %u\n",
btrfs_root_blocknr(ri), btrfs_root_refs(ri));
fflush(stdout);