linux-ext4 - [PATCH] e2fsprogs- fix ext2fs_swap_inode

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Message-ID: <47C882CD.3090204@redhat.com>
Date:	Fri, 29 Feb 2008 16:10:21 -0600
From:	Eric Sandeen <sandeen@...hat.com>
To:	ext4 development <linux-ext4@...r.kernel.org>
Subject: [PATCH] e2fsprogs- fix ext2fs_swap_inode_full attr test on BE boxes

After the fix for resize2fs's inode mover losing in-inode
extended attributes, the regression test I wrote caught 
that the attrs were still getting lost on powerpc.

Looks like the problem is that ext2fs_swap_inode_full()
isn't paying attention to whether or not the EA magic is
in hostorder, so it's not recognized (and not swapped)
on BE machines.  Patch below seems to fix it.

Yay for regression tests.  ;)

Signed-off-by: Eric Sandeen <sandeen@...hat.com>
---

Index: e2fsprogs-1.40.7/lib/ext2fs/swapfs.c
===================================================================
--- e2fsprogs-1.40.7.orig/lib/ext2fs/swapfs.c
+++ e2fsprogs-1.40.7/lib/ext2fs/swapfs.c
@@ -133,7 +133,7 @@ void ext2fs_swap_inode_full(ext2_filsys 
 			    struct ext2_inode_large *f, int hostorder,
 			    int bufsize)
 {
-	unsigned i, has_data_blocks, extra_isize;
+	unsigned i, has_data_blocks, extra_isize, attr_magic;
 	int islnk = 0;
 	__u32 *eaf, *eat;
 
@@ -231,13 +231,17 @@ void ext2fs_swap_inode_full(ext2_filsys 
 
 	eaf = (__u32 *) (((char *) f) + sizeof(struct ext2_inode) +
 					extra_isize);
-
-	if (ext2fs_swab32(*eaf) != EXT2_EXT_ATTR_MAGIC)
-		return; /* it seems no magic here */
-
 	eat = (__u32 *) (((char *) t) + sizeof(struct ext2_inode) +
 					extra_isize);
+
+	if (hostorder)
+		attr_magic = *eaf;
 	*eat = ext2fs_swab32(*eaf);
+	if (!hostorder)
+		attr_magic = *eat;
+
+	if (attr_magic != EXT2_EXT_ATTR_MAGIC)
+		return; /* it seems no magic here */
 
 	/* convert EA(s) */
 	ext2fs_swap_ext_attr((char *) (eat + 1), (char *) (eaf + 1),

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