linux-kernel - [PATCH 3.2 10/52] Btrfs: added helper btrfs_next

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Message-ID: <lsq.1448404439.12070637@decadent.org.uk>
Date:	Tue, 24 Nov 2015 22:33:59 +0000
From:	Ben Hutchings <ben@...adent.org.uk>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org
CC:	akpm@...ux-foundation.org, "Arne Jansen" <sensille@....net>,
	"Jan Schmidt" <list.btrfs@...-o-sch.net>
Subject: [PATCH 3.2 10/52] Btrfs: added helper btrfs_next_item()

3.2.74-rc1 review patch.  If anyone has any objections, please let me know.

------------------

From: Jan Schmidt <list.btrfs@...-o-sch.net>

commit c7d22a3c3cdb73d8a0151e2ccc8cf4a48c48310b upstream.

btrfs_next_item() makes the btrfs path point to the next item, crossing leaf
boundaries if needed.

Signed-off-by: Arne Jansen <sensille@....net>
Signed-off-by: Jan Schmidt <list.btrfs@...-o-sch.net>
[bwh: Dependency of the following fix]
Signed-off-by: Ben Hutchings <ben@...adent.org.uk>
---
 fs/btrfs/ctree.h | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/fs/btrfs/ctree.h b/fs/btrfs/ctree.h
index 50634abe..3e4a07b 100644
--- a/fs/btrfs/ctree.h
+++ b/fs/btrfs/ctree.h
@@ -2482,6 +2482,13 @@ static inline int btrfs_insert_empty_item(struct btrfs_trans_handle *trans,
 }
 
 int btrfs_next_leaf(struct btrfs_root *root, struct btrfs_path *path);
+static inline int btrfs_next_item(struct btrfs_root *root, struct btrfs_path *p)
+{
+	++p->slots[0];
+	if (p->slots[0] >= btrfs_header_nritems(p->nodes[0]))
+		return btrfs_next_leaf(root, p);
+	return 0;
+}
 int btrfs_prev_leaf(struct btrfs_root *root, struct btrfs_path *path);
 int btrfs_leaf_free_space(struct btrfs_root *root, struct extent_buffer *leaf);
 void btrfs_drop_snapshot(struct btrfs_root *root,

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