linux-ext4 - [PATCH] mke2fs: disable resize_inode feature if 64bit feature is enabled

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Message-Id: <1372928710-10461-1-git-send-email-guaneryu@gmail.com>
Date:	Thu,  4 Jul 2013 17:05:10 +0800
From:	Eryu Guan <guaneryu@...il.com>
To:	linux-ext4@...r.kernel.org
Cc:	tytso@....edu, Eryu Guan <guaneryu@...il.com>
Subject: [PATCH] mke2fs: disable resize_inode feature if 64bit feature is enabled

Since auto_64-bit_support is on by default, resize_inode feature will
be disabled when creating a >16T ext4 according to mke2fs.conf(5).

This should also be done when making ext4 with "-O 64bit" to enable
64bit feature explicitly. Otherwise online resize to enlarge a
over-16T fs to larger would fail.

[root@...alhost resize]# truncate -s 50t fs.img
[root@...alhost resize]# losetup /dev/loop0 fs.img
[root@...alhost resize]# mkfs -t ext4 -O 64bit /dev/loop0 30t
[root@...alhost resize]# mount /dev/loop0 mnt
[root@...alhost resize]# resize2fs /dev/loop0
resize2fs 1.42.7 (21-Jan-2013)
Filesystem at /dev/loop0 is mounted on /root/resize/mnt; on-line resizing required
old_desc_blocks = 3840, new_desc_blocks = 6400
resize2fs: Invalid argument While checking for on-line resizing support

And dmesg shows
[688378.442623] EXT4-fs (loop0): resizing filesystem from 6710886400 to 13421772800 blocks
[688378.443216] EXT4-fs warning (device loop0): verify_reserved_gdb:700: reserved GDT 3201 missing grp 177147 (5804756097)
[688378.443222] EXT4-fs (loop0): resized filesystem to 8858370048
[688378.528451] EXT4-fs warning (device loop0): ext4_group_extend:1710: can't shrink FS - resize aborted

With this fix resize2fs could do the online enlarge correctly.

Signed-off-by: Eryu Guan <guaneryu@...il.com>
---
 misc/mke2fs.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/misc/mke2fs.c b/misc/mke2fs.c
index d96f156..e4102b9 100644
--- a/misc/mke2fs.c
+++ b/misc/mke2fs.c
@@ -1790,6 +1790,9 @@ profile_error:
 		fs_param.s_log_block_size = 2;
 	}
 	if ((fs_blocks_count > MAX_32_NUM) &&
+	    (fs_param.s_feature_incompat & EXT4_FEATURE_INCOMPAT_64BIT))
+		fs_param.s_feature_compat &= ~EXT2_FEATURE_COMPAT_RESIZE_INODE;
+	if ((fs_blocks_count > MAX_32_NUM) &&
 	    !(fs_param.s_feature_incompat & EXT4_FEATURE_INCOMPAT_64BIT) &&
 	    get_bool_from_profile(fs_types, "auto_64-bit_support", 0)) {
 		fs_param.s_feature_incompat |= EXT4_FEATURE_INCOMPAT_64BIT;
-- 
1.8.3.1

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