On Wed, Jun 21, 2017 at 06:49:39PM -0700, Tahsin Erdogan wrote:
> The main purpose of mb cache is to achieve deduplication in
> extended attributes. In use cases where opportunity for deduplication
> is unlikely, it only adds overhead.
>
> Add a mount option to explicitly turn off mb cache.
>
> S
On Wed, Jun 21, 2017 at 04:46:48PM -0700, Tahsin Erdogan wrote:
> Remount option handling is a bit strange. If an option is not
> specified, it is not automatically cleared in sbi->s_mount_opt. So,
> once nombcache option is set in the original mount, it is not possible
> to clear it. I don't know
>> + if ((sbi->s_mount_opt ^ old_opts.s_mount_opt) & EXT4_MOUNT_NO_MBCACHE)
>> {
>> + ext4_msg(sb, KERN_ERR, "can't enable nombcache during
>> remount");
>> + err = -EINVAL;
>> + goto restore_opts;
>> + }
>
> It appears that this restriction also applie
On Jun 20, 2017, at 3:14 AM, Tahsin Erdogan wrote:
>
> The main purpose of mb cache is to achieve deduplication in
> extended attributes. In use cases where opportunity for deduplication
> is unlikely, it only adds overhead.
>
> Add a mount option to explicitly turn off mb cache.
>
> Suggested-
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