linux-ext4 - [PATCH 11/11] ext4: fix ext_remove_space for punch

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Date:	Fri, 28 Sep 2012 19:44:11 +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 11/11] ext4: fix ext_remove_space for punch_hole case

Inode is allowed to have empty leaf only if it this is blockless inode.

Signed-off-by: Dmitry Monakhov <dmonakhov@...nvz.org>
---
 fs/ext4/extents.c |   16 +++++++++-------
 1 files changed, 9 insertions(+), 7 deletions(-)

diff --git a/fs/ext4/extents.c b/fs/ext4/extents.c
index a1d16eb..5ed6e86 100644
--- a/fs/ext4/extents.c
+++ b/fs/ext4/extents.c
@@ -2589,7 +2589,7 @@ static int ext4_ext_remove_space(struct inode *inode, ext4_lblk_t start,
 	struct ext4_ext_path *path = NULL;
 	ext4_fsblk_t partial_cluster = 0;
 	handle_t *handle;
-	int i = 0, err;
+	int i = 0, err = 0;
 
 	ext_debug("truncate since %u to %u\n", start, end);
 
@@ -2621,12 +2621,16 @@ 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);
@@ -2658,8 +2662,6 @@ again:
 				goto out;
 		}
 	}
-cont:
-
 	/*
 	 * We start scanning from right side, freeing all the blocks
 	 * after i_size and walking into the tree depth-wise.
-- 
1.7.7.6

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