linux-ext4 - [PATCH 02/31] libext2fs: Only link an inode into a directory once

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Date:	Mon, 30 Sep 2013 18:26:55 -0700
From:	"Darrick J. Wong" <darrick.wong@...cle.com>
To:	tytso@....edu, darrick.wong@...cle.com
Cc:	linux-ext4@...r.kernel.org
Subject: [PATCH 02/31] libext2fs: Only link an inode into a directory once

The ext2fs_link helper function link_proc does not check the value of ls->done,
which means that if the function finds multiple empty spaces that will fit the
new directory entry, it will create a directory entry in each of the spaces.
Instead of doing that, check the done value and don't do anything more if we've
already added the directory entry.

Signed-off-by: Darrick J. Wong <darrick.wong@...cle.com>
---
 lib/ext2fs/link.c |    3 +++
 1 file changed, 3 insertions(+)

diff --git a/lib/ext2fs/link.c b/lib/ext2fs/link.c
index f715067..e3ff450 100644
--- a/lib/ext2fs/link.c
+++ b/lib/ext2fs/link.c
@@ -43,6 +43,9 @@ static int link_proc(struct ext2_dir_entry *dirent,
 	int ret = 0;
 	int csum_size = 0;

+	if (ls->done)
+		return 0;
+
 	rec_len = EXT2_DIR_REC_LEN(ls->namelen);

 	ls->err = ext2fs_get_rec_len(ls->fs, dirent, &curr_rec_len);

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