linux-ext4 - [PATCH 04/47] libext2fs: fix endian handling error; reduce fragmentation some

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Date:	Fri, 07 Nov 2014 13:51:08 -0800
From:	"Darrick J. Wong" <darrick.wong@...cle.com>
To:	tytso@....edu, darrick.wong@...cle.com
Cc:	linux-ext4@...r.kernel.org
Subject: [PATCH 04/47] libext2fs: fix endian handling error;
 reduce fragmentation some

If we're going to read the "nr - 1" entry in an indirect block for use
as a "goal" input to the block allocator, we need to byteswap the
entry.  While we're at it, if we're allocating blocks for the zeroth
entry in the indirect block, we might as well use the indirect block
as the starting point to try to reduce fragmentation.

(d_fallocate_blkmap will test this...)

Signed-off-by: Darrick J. Wong <darrick.wong@...cle.com>
---
 lib/ext2fs/bmap.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/lib/ext2fs/bmap.c b/lib/ext2fs/bmap.c
index c1d0e6f..f819e9c 100644
--- a/lib/ext2fs/bmap.c
+++ b/lib/ext2fs/bmap.c
@@ -67,7 +67,7 @@ static _BMAP_INLINE_ errcode_t block_ind_bmap(ext2_filsys fs, int flags,
 #endif

 	if (!b && (flags & BMAP_ALLOC)) {
-		b = nr ? ((blk_t *) block_buf)[nr-1] : 0;
+		b = nr ? ext2fs_le32_to_cpu(((blk_t *)block_buf)[nr - 1]) : ind;
 		retval = ext2fs_alloc_block(fs, b,
 					    block_buf + fs->blocksize, &b);
 		if (retval)

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