From: Darrick J. Wong <darrick.wong@oracle.com>
Date: Mon, 16 Dec 2013 04:54:07 +0000 (-0500)
Subject: e2fsck: try implied cluster allocation when expanding a dir
X-Git-Tag: v1.42.9~48
X-Git-Url: https://git.whamcloud.com/?a=commitdiff_plain;h=0047255f602ae725a37f24c9b3214a1400459a20;p=tools%2Fe2fsprogs.git

e2fsck: try implied cluster allocation when expanding a dir

When we're expanding a directory, check to see if we're doing an
implied cluster allocation; if so, we don't need to allocate a new
block, and we certainly don't need to update the summary counts.

Reported-by: Zheng Liu <wenqing.lz@taobao.com>
Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
---

diff --git a/e2fsck/pass3.c b/e2fsck/pass3.c
index d7a243e..d87bd79 100644
--- a/e2fsck/pass3.c
+++ b/e2fsck/pass3.c
@@ -713,12 +713,23 @@ static int expand_dir_proc(ext2_filsys fs,
 		last_blk = *blocknr;
 		return 0;
 	}
-	retval = ext2fs_new_block2(fs, last_blk, ctx->block_found_map,
-				  &new_blk);
-	if (retval) {
-		es->err = retval;
-		return BLOCK_ABORT;
+
+	if (blockcnt &&
+	    (EXT2FS_B2C(fs, last_blk) == EXT2FS_B2C(fs, last_blk + 1)))
+		new_blk = last_blk + 1;
+	else {
+		last_blk &= ~EXT2FS_CLUSTER_MASK(fs);
+		retval = ext2fs_new_block2(fs, last_blk, ctx->block_found_map,
+					  &new_blk);
+		if (retval) {
+			es->err = retval;
+			return BLOCK_ABORT;
+		}
+		es->newblocks++;
+		ext2fs_block_alloc_stats2(fs, new_blk, +1);
 	}
+	last_blk = new_blk;
+
 	if (blockcnt > 0) {
 		retval = ext2fs_new_dir_block(fs, 0, 0, &block);
 		if (retval) {
@@ -743,8 +754,6 @@ static int expand_dir_proc(ext2_filsys fs,
 	ext2fs_free_mem(&block);
 	*blocknr = new_blk;
 	ext2fs_mark_block_bitmap2(ctx->block_found_map, new_blk);
-	ext2fs_block_alloc_stats2(fs, new_blk, +1);
-	es->newblocks++;
 
 	if (es->num == 0)
 		return (BLOCK_CHANGED | BLOCK_ABORT);