linux-ext4 - [PATCH 10/10] ext4: fix ext_remove_space for punch

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Message-Id: <1348487060-19598-11-git-send-email-dmonakhov@openvz.org>
Date:	Mon, 24 Sep 2012 15:44:20 +0400
From:	Dmitry Monakhov <dmonakhov@...nvz.org>
To:	linux-ext4@...r.kernel.org
Cc:	tytso@....edu, jack@...e.cz, lczerner@...hat.com,
	Dmitry Monakhov <dmonakhov@...nvz.org>
Subject: [PATCH 10/10] ext4: fix ext_remove_space for punch_hole case

Inode is allowed to have empty leaf only if it this is blockless inode
i.e. (depth == 0).

Signed-off-by: Dmitry Monakhov <dmonakhov@...nvz.org>
---
 fs/ext4/extents.c |   11 +++++++----
 1 files changed, 7 insertions(+), 4 deletions(-)

diff --git a/fs/ext4/extents.c b/fs/ext4/extents.c
index 2d58f4c..57d6438 100644
--- a/fs/ext4/extents.c
+++ b/fs/ext4/extents.c
@@ -2648,12 +2648,15 @@ again:
 			return PTR_ERR(path);
 		}
 		depth = ext_depth(inode);
+		/* Leaf not may not exist only if inode has no blocks at all */
 		ex = path[depth].p_ext;
 		if (!ex) {
-			ext4_ext_drop_refs(path);
-			kfree(path);
-			path = NULL;
-			goto cont;
+			if (depth) {
+				EXT4_ERROR_INODE(inode, "path[%d].p_hdr == NULL",
+						 depth);
+				err = -EIO;
+			}
+			goto out;
 		}
 
 		ee_block = le32_to_cpu(ex->ee_block);
-- 
1.7.7.6

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