linux-ext4 - [PATCH v2 19/21] e2fsck: be more careful in assuming inline

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Message-ID: <20140808162258.GA11191@birch.djwong.org>
Date:	Fri, 8 Aug 2014 09:22:58 -0700
From:	"Darrick J. Wong" <darrick.wong@...cle.com>
To:	tytso@....edu
Cc:	linux-ext4@...r.kernel.org
Subject: [PATCH v2 19/21] e2fsck: be more careful in assuming inline_data
 inodes are directories

If a file is marked inline_data but its i_size isn't a multiple of
four, it probably isn't an inline directory, because directory entries
have sizes that are multiples of four.

v2: Don't add unnecessary variables.

Signed-off-by: Darrick J. Wong <darrick.wong@...cle.com>
---
 e2fsck/pass1.c |    6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/e2fsck/pass1.c b/e2fsck/pass1.c
index ce373f3..8cff18d 100644
--- a/e2fsck/pass1.c
+++ b/e2fsck/pass1.c
@@ -540,6 +540,12 @@ static void check_is_really_dir(e2fsck_t ctx, struct problem_context *pctx,

 		if (ext2fs_inline_data_size(ctx->fs, pctx->ino, &size))
 			return;
+		/*
+		 * If the size isn't a multiple of 4, it's probably not a
+		 * directory??
+		 */
+		if (size & 3)
+			return;
 		/* device files never have a "system.data" entry */
 		goto isdir;
 	} else if (extent_fs && (inode->i_flags & EXT4_EXTENTS_FL)) {
--
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