On Mon, Apr 23, 2018 at 09:00:08AM -0600, Amir Goldstein wrote:
> If fs is frozen after mount and before the first file open, the
> update of s_last_mounted bypasses freeze protection and prints out
> a WARNING splat:
>
> $ mount /vdf
> $ fsfreeze -f /vdf
> $ cat /vdf/foo
>
> [ 31.578555] WARNING: CPU: 1 PID: 1415 at
> fs/ext4/ext4_jbd2.c:53 ext4_journal_check_start+0x48/0x82
>
> [ 31.614016] Call Trace:
> [ 31.614997] __ext4_journal_start_sb+0xe4/0x1a4
> [ 31.616771] ? ext4_file_open+0xb6/0x189
> [ 31.618094] ext4_file_open+0xb6/0x189
>
> If fs is frozen, skip s_last_mounted update.
>
> [backport hint: to apply to stable tree, need to apply also patches
> vfs: add the sb_start_intwrite_trylock() helper
> ext4: factor out helper ext4_sample_last_mounted()]
>
> Fixes: bc0b0d6d69ee ("ext4: update the s_last_mounted field in the
> superblock")
> Cc: <stable@xxxxxxxxxxxxxxx>
> Reviewed-by: Jan Kara <jack@xxxxxxx>
> Signed-off-by: Amir Goldstein <amir73il@xxxxxxxxx>
Applied, thanks.
- Ted
