From: Theodore Ts'o Date: Wed, 29 Jun 2022 04:00:25 +0000 (-0400) Subject: ext4: update s_overhead_clusters in the superblock during an on-line resize X-Git-Tag: baikal/mips/sdk5.9~40 X-Git-Url: https://git.baikalelectronics.ru/sdk/?a=commitdiff_plain;h=4da455c899a53cb3a248ff73b4a56e7888fa7ac6;p=kernel.git ext4: update s_overhead_clusters in the superblock during an on-line resize [ Upstream commit 0f47fa7905b5c0deead08ac2d4830e7bd7ed8d8b ] When doing an online resize, the on-disk superblock on-disk wasn't updated. This means that when the file system is unmounted and remounted, and the on-disk overhead value is non-zero, this would result in the results of statfs(2) to be incorrect. This was partially fixed by Commits 5bf43d031edc ("ext4: fix overhead calculation to account for the reserved gdt blocks"), 0371b6196528 ("ext4: force overhead calculation if the s_overhead_cluster makes no sense"), and fdaf209c1c0f ("ext4: update the cached overhead value in the superblock"). However, since it was too expensive to forcibly recalculate the overhead for bigalloc file systems at every mount, this didn't fix the problem for bigalloc file systems. This commit should address the problem when resizing file systems with the bigalloc feature enabled. Signed-off-by: Theodore Ts'o Cc: stable@kernel.org Reviewed-by: Andreas Dilger Link: https://lore.kernel.org/r/20220629040026.112371-1-tytso@mit.edu Signed-off-by: Theodore Ts'o Signed-off-by: Sasha Levin --- diff --git a/fs/ext4/resize.c b/fs/ext4/resize.c index 56c9ef0687fcf..fa3c854125bbf 100644 --- a/fs/ext4/resize.c +++ b/fs/ext4/resize.c @@ -1472,6 +1472,7 @@ static void ext4_update_super(struct super_block *sb, * Update the fs overhead information */ ext4_calculate_overhead(sb); + es->s_overhead_clusters = cpu_to_le32(sbi->s_overhead); if (test_opt(sb, DEBUG)) printk(KERN_DEBUG "EXT4-fs: added group %u:"