ext4: don't update the superblock in ext4_statfs()

commit a71ce8c6c9bf269b192f352ea555217815cf027e updated ext4_statfs()
to update the on-disk superblock counters, but modified this buffer
directly without any journaling of the change.  This is one of the
accesses that was causing the crc errors in journal replay as seen in
kernel.org bugzilla #14354.

Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
Cc: stable@kernel.org

diff --git a/fs/ext4/super.c b/fs/ext4/super.c
index 04c66907b2fea46f409fd53bdcee7319176ebbab..f2d5ec77c1e95f64b1ef7c945c8b68cb2b660b52 100644 (file)
--- a/fs/ext4/super.c
+++ b/fs/ext4/super.c
@@ -3648,13 +3648,11 @@ static int ext4_statfs(struct dentry *dentry, struct kstatfs *buf)
        buf->f_blocks = ext4_blocks_count(es) - sbi->s_overhead_last;
        buf->f_bfree = percpu_counter_sum_positive(&sbi->s_freeblocks_counter) -
                       percpu_counter_sum_positive(&sbi->s_dirtyblocks_counter);
-       ext4_free_blocks_count_set(es, buf->f_bfree);
        buf->f_bavail = buf->f_bfree - ext4_r_blocks_count(es);
        if (buf->f_bfree < ext4_r_blocks_count(es))
                buf->f_bavail = 0;
        buf->f_files = le32_to_cpu(es->s_inodes_count);
        buf->f_ffree = percpu_counter_sum_positive(&sbi->s_freeinodes_counter);
-       es->s_free_inodes_count = cpu_to_le32(buf->f_ffree);
        buf->f_namelen = EXT4_NAME_LEN;
        fsid = le64_to_cpup((void *)es->s_uuid) ^
               le64_to_cpup((void *)es->s_uuid + sizeof(u64));