linux-ext4 - [PATCH] mke2fs: check extents feature when bigalloc feature is enabled

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Message-Id: <1357475117-5095-1-git-send-email-wenqing.lz@taobao.com>
Date:	Sun,  6 Jan 2013 20:25:17 +0800
From:	Zheng Liu <gnehzuil.liu@...il.com>
To:	linux-ext4@...r.kernel.org
Cc:	Zheng Liu <wenqing.lz@...bao.com>
Subject: [PATCH] mke2fs: check extents feature when bigalloc feature is enabled

From: Zheng Liu <wenqing.lz@...bao.com>

When bigalloc feature is enabled in mkfs, extents feature also needs to be
enabled.  But now when bigalloc feature is enabled without extents feature,
users will not get any warning messages until they try to mount this file
system.

Signed-off-by: Zheng Liu <wenqing.lz@...bao.com>
---
 misc/mke2fs.c | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/misc/mke2fs.c b/misc/mke2fs.c
index a288147..713eb21 100644
--- a/misc/mke2fs.c
+++ b/misc/mke2fs.c
@@ -1988,6 +1988,15 @@ profile_error:
 		fs_param.s_feature_ro_compat &=
 				~EXT4_FEATURE_RO_COMPAT_GDT_CSUM;
 
+	/* Can't support bigalloc feature without extents feature */
+	if ((fs_param.s_feature_ro_compat & EXT4_FEATURE_RO_COMPAT_BIGALLOC) &&
+	    !(fs_param.s_feature_incompat & EXT3_FEATURE_INCOMPAT_EXTENTS)) {
+		com_err(program_name, 0,
+			_("Can't support bigalloc feature without "
+			  "extents feature"));
+		exit(1);
+	}
+
 	/* Since sparse_super is the default, we would only have a problem
 	 * here if it was explicitly disabled.
 	 */
-- 
1.7.12.rc2.18.g61b472e

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