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To:     "linux-ext4@vger.kernel.org" <linux-ext4@vger.kernel.org>
CC:     "tytso@mit.edu" <tytso@mit.edu>
Subject: [PATCH] ext4: continue to expand file system when the target size
 doesn't reach
Thread-Topic: [PATCH] ext4: continue to expand file system when the target
 size doesn't reach
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Date:   Mon, 18 Jul 2022 10:25:19 +0000
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When expanding a file system from (16TiB-2MiB) to 18TiB, the operation=0A=
exits early which leads to result inconsistency between resize2fs and=0A=
Ext4 kernel driver.=0A=
=0A=
=3D=3D=3D before =3D=3D=3D=0A=
=1B$B!{=1B(B =1B$B"*=1B(B resize2fs /dev/mapper/thin=0A=
resize2fs 1.45.5 (07-Jan-2020)=0A=
Filesystem at /dev/mapper/thin is mounted on /mnt/test; on-line resizing re=
quired=0A=
old_desc_blocks =3D 2048, new_desc_blocks =3D 2304=0A=
The filesystem on /dev/mapper/thin is now 4831837696 (4k) blocks long.=0A=
=0A=
[  865.186308] EXT4-fs (dm-5): mounted filesystem with ordered data mode. O=
pts: (null). Quota mode: none.=0A=
[  912.091502] dm-4: detected capacity change from 34359738368 to 386547056=
64=0A=
[  970.030550] dm-5: detected capacity change from 34359734272 to 386547015=
68=0A=
[ 1000.012751] EXT4-fs (dm-5): resizing filesystem from 4294966784 to 48318=
37696 blocks=0A=
[ 1000.012878] EXT4-fs (dm-5): resized filesystem to 4294967296=0A=
=0A=
=3D=3D=3D after =3D=3D=3D=0A=
[  129.104898] EXT4-fs (dm-5): mounted filesystem with ordered data mode. O=
pts: (null). Quota mode: none.=0A=
[  143.773630] dm-4: detected capacity change from 34359738368 to 386547056=
64=0A=
[  198.203246] dm-5: detected capacity change from 34359734272 to 386547015=
68=0A=
[  207.918603] EXT4-fs (dm-5): resizing filesystem from 4294966784 to 48318=
37696 blocks=0A=
[  207.918754] EXT4-fs (dm-5): resizing filesystem from 4294967296 to 48318=
37696 blocks=0A=
[  207.918758] EXT4-fs (dm-5): Converting file system to meta_bg=0A=
[  207.918790] EXT4-fs (dm-5): resizing filesystem from 4294967296 to 48318=
37696 blocks=0A=
[  221.454050] EXT4-fs (dm-5): resized to 4658298880 blocks=0A=
[  227.634613] EXT4-fs (dm-5): resized filesystem to 4831837696=0A=
=0A=
Signed-off-by: Jerry Lee <jerrylee@qnap.com>=0A=
---=0A=
 fs/ext4/resize.c | 2 +-=0A=
 1 file changed, 1 insertion(+), 1 deletion(-)=0A=
=0A=
diff --git a/fs/ext4/resize.c b/fs/ext4/resize.c=0A=
index 56c9ef0687fc..5ab7d1c38fad 100644=0A=
--- a/fs/ext4/resize.c=0A=
+++ b/fs/ext4/resize.c=0A=
@@ -2077,7 +2077,7 @@ int ext4_resize_fs(struct super_block *sb, ext4_fsblk=
_t n_blocks_count)=0A=
 			goto out;=0A=
 	}=0A=
 =0A=
-	if (ext4_blocks_count(es) =3D=3D n_blocks_count)=0A=
+	if (ext4_blocks_count(es) =3D=3D n_blocks_count && n_blocks_count_retry =
=3D=3D 0)=0A=
 		goto out;=0A=
 =0A=
 	err =3D ext4_alloc_flex_bg_array(sb, n_group + 1);=0A=
-- =0A=
2.17.1=0A=