linux-ext4 - [PATCH 2.6.33.y 09/40] ext4: Fix insertion point of extent in mext_insert_across

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Date:	Tue,  1 Jun 2010 08:02:56 -0400
From:	Theodore Ts'o <tytso@....edu>
To:	stable@...r.kernel.org
Cc:	Ext4 Developers List <linux-ext4@...r.kernel.org>,
	Akira Fujita <a-fujita@...jp.nec.com>,
	"Theodore Ts'o" <tytso@....edu>
Subject: [PATCH 2.6.33.y 09/40] ext4: Fix insertion point of extent in mext_insert_across_blocks()

From: Akira Fujita <a-fujita@...jp.nec.com>

commit 5fd5249aa36fad98c9fd5edced352939e54f9324 upstream (as of v2.6.33-git11)

If the leaf node has 2 extent space or fewer and EXT4_IOC_MOVE_EXT
ioctl is called with the file offset where after the 2nd extent
covers, mext_insert_across_blocks() always tries to insert extent into
the first extent.  As a result, the file gets corrupted because of
wrong extent order.  The patch fixes this problem.

Signed-off-by: Akira Fujita <a-fujita@...jp.nec.com>
Signed-off-by: "Theodore Ts'o" <tytso@....edu>
---
 fs/ext4/move_extent.c |    4 ++++
 1 files changed, 4 insertions(+), 0 deletions(-)

diff --git a/fs/ext4/move_extent.c b/fs/ext4/move_extent.c
index 82c415b..b2b2e67 100644
--- a/fs/ext4/move_extent.c
+++ b/fs/ext4/move_extent.c
@@ -252,6 +252,7 @@ mext_insert_across_blocks(handle_t *handle, struct inode *orig_inode,
 		}
 
 		o_start->ee_len = start_ext->ee_len;
+		eblock = le32_to_cpu(start_ext->ee_block);
 		new_flag = 1;
 
 	} else if (start_ext->ee_len && new_ext->ee_len &&
@@ -262,6 +263,7 @@ mext_insert_across_blocks(handle_t *handle, struct inode *orig_inode,
 		 * orig  |------------------------------|
 		 */
 		o_start->ee_len = start_ext->ee_len;
+		eblock = le32_to_cpu(start_ext->ee_block);
 		new_flag = 1;
 
 	} else if (!start_ext->ee_len && new_ext->ee_len &&
@@ -502,6 +504,7 @@ mext_leaf_block(handle_t *handle, struct inode *orig_inode,
 		le32_to_cpu(oext->ee_block) + oext_alen) {
 		start_ext.ee_len = cpu_to_le16(le32_to_cpu(new_ext.ee_block) -
 					       le32_to_cpu(oext->ee_block));
+		start_ext.ee_block = oext->ee_block;
 		copy_extent_status(oext, &start_ext);
 	} else if (oext > EXT_FIRST_EXTENT(orig_path[depth].p_hdr)) {
 		prev_ext = oext - 1;
@@ -515,6 +518,7 @@ mext_leaf_block(handle_t *handle, struct inode *orig_inode,
 			start_ext.ee_len = cpu_to_le16(
 				ext4_ext_get_actual_len(prev_ext) +
 				new_ext_alen);
+			start_ext.ee_block = oext->ee_block;
 			copy_extent_status(prev_ext, &start_ext);
 			new_ext.ee_len = 0;
 		}
-- 
1.6.6.1.1.g974db.dirty

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