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
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-by: Andreas Dilger
Signed-off-by: Tahsin Erdogan
---
v2:
- updated
>> + 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
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-by: Andreas Dilger
Signed-off-by: Tahsin Erdogan
---
fs/ext4/ext4.
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-
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-by: Andreas Dilger
Signed-off-by: Tahsin Erdogan
---
fs/ext4/ext4.
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