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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
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@ -3648,13 +3648,11 @@ static int ext4_statfs(struct dentry *dentry, struct kstatfs *buf)
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buf->f_blocks = ext4_blocks_count(es) - sbi->s_overhead_last;
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buf->f_bfree = percpu_counter_sum_positive(&sbi->s_freeblocks_counter) -
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percpu_counter_sum_positive(&sbi->s_dirtyblocks_counter);
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ext4_free_blocks_count_set(es, buf->f_bfree);
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buf->f_bavail = buf->f_bfree - ext4_r_blocks_count(es);
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if (buf->f_bfree < ext4_r_blocks_count(es))
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buf->f_bavail = 0;
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buf->f_files = le32_to_cpu(es->s_inodes_count);
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buf->f_ffree = percpu_counter_sum_positive(&sbi->s_freeinodes_counter);
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es->s_free_inodes_count = cpu_to_le32(buf->f_ffree);
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buf->f_namelen = EXT4_NAME_LEN;
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fsid = le64_to_cpup((void *)es->s_uuid) ^
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le64_to_cpup((void *)es->s_uuid + sizeof(u64));
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