On Tue, May 17, 2016 at 11:41:28AM +0800, Wang Shilong wrote:
> From: Wang Shilong <wshilong@xxxxxxx>
>
> Somtimes, we need figure out progress of Lazyinit
> in the background, this patch try to add stats support
> for it, output is something like:
>
> $ cat /sys/fs/ext4/vda/lazyinit_stats
> groups_finished: 80
> groups_total: 80
That's more of a procfs style of output. In general the sysfs idiom
would be to have two sysfs variables:
/sys/fs/ext4/vda/nr_block_groups
/sys/fs/ext4/vda/nr_lazyinit_bg_done
and each would return an integer value.
For example:
% cat /sys/block/sda/queue/discard_granularity
512
% cat /sys/block/sda/queue/discard_max_bytes
2147450880
% cat /sys/block/sda/queue/discard_zeroes_data
0
There are certainly some exceptions to this rule, but it certainly
simplifies the sysfs support code, as well as making it a bit easier
for userspace programs to parse the output from those files.
- Ted
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