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https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
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Btrfs: add leaf data casting helper
Signed-off-by: Chris Mason <chris.mason@oracle.com>
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parent
710874947a
commit
4beb1b8b75
3 changed files with 8 additions and 9 deletions
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@ -401,6 +401,10 @@ static inline void btrfs_set_super_blocksize(struct btrfs_super_block *s,
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s->blocksize = cpu_to_le16(val);
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}
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/* helper function to cast into the data area of the leaf. */
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#define btrfs_item_ptr(leaf, slot, type) \
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((type *)((leaf)->data + btrfs_item_offset((leaf)->items + (slot))))
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struct btrfs_buffer *btrfs_alloc_free_block(struct btrfs_root *root);
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int btrfs_inc_ref(struct btrfs_root *root, struct btrfs_buffer *buf);
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int btrfs_free_extent(struct btrfs_root *root, u64 blocknr, u64 num_blocks);
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@ -41,9 +41,7 @@ static int inc_block_ref(struct btrfs_root *root, u64 blocknr)
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BUG();
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BUG_ON(ret != 0);
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l = &path.nodes[0]->leaf;
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item = (struct btrfs_extent_item *)(l->data +
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btrfs_item_offset(l->items +
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path.slots[0]));
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item = btrfs_item_ptr(l, path.slots[0], struct btrfs_extent_item);
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refs = btrfs_extent_refs(item);
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btrfs_set_extent_refs(item, refs + 1);
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@ -69,9 +67,7 @@ static int lookup_block_ref(struct btrfs_root *root, u64 blocknr, u32 *refs)
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if (ret != 0)
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BUG();
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l = &path.nodes[0]->leaf;
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item = (struct btrfs_extent_item *)(l->data +
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btrfs_item_offset(l->items +
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path.slots[0]));
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item = btrfs_item_ptr(l, path.slots[0], struct btrfs_extent_item);
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*refs = btrfs_extent_refs(item);
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btrfs_release_path(root->extent_root, &path);
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return 0;
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@ -26,11 +26,10 @@ void btrfs_print_leaf(struct btrfs_leaf *l)
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btrfs_item_size(item));
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printf("\t\titem data %.*s\n", btrfs_item_size(item),
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l->data + btrfs_item_offset(item));
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ei = (struct btrfs_extent_item *)(l->data +
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btrfs_item_offset(item));
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ei = btrfs_item_ptr(l, i, struct btrfs_extent_item);
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printf("\t\textent data refs %u owner %Lu\n",
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btrfs_extent_refs(ei), btrfs_extent_owner(ei));
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ri = (struct btrfs_root_item *)ei;
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ri = btrfs_item_ptr(l, i, struct btrfs_root_item);
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printf("\t\troot data blocknr %Lu refs %u\n",
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btrfs_root_blocknr(ri), btrfs_root_refs(ri));
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fflush(stdout);
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