Re: [PATCH 2/2] abstract block export operations from nfsd layouts

["Benjamin Coddington" <bcodding@redhat.com>]

On 7 Jul 2016, at 18:38, Dave Chinner wrote:

> On Thu, Jul 07, 2016 at 07:02:32AM -0400, Benjamin Coddington wrote:
>> Instead of creeping pnfs layout configuration into filesystems, move the
>> definition of block-based export operations under a more abstract
>> configuration.
>>
>> Signed-off-by: Benjamin Coddington <bcodding@redhat.com>
>> ---
>>  fs/Kconfig          | 3 +++
>>  fs/nfsd/Kconfig     | 2 ++
>>  fs/xfs/Makefile     | 3 +--
>>  fs/xfs/xfs_export.c | 2 +-
>>  fs/xfs/xfs_pnfs.h   | 4 ++--
>>  5 files changed, 9 insertions(+), 5 deletions(-)
>>
>> diff --git a/fs/Kconfig b/fs/Kconfig
>> index 6725f59c18e6..6e57b4237d72 100644
>> --- a/fs/Kconfig
>> +++ b/fs/Kconfig
>> @@ -66,6 +66,9 @@ config FS_POSIX_ACL
>>  config EXPORTFS
>>  	tristate
>>
>> +config BLOCK_EXPORT_OPS
>> +	bool
>> +
>
> default n, help text?

Not set is n, and as it isn't visible or intended to be set by a user, I
left out the help text.  I'll add both for completeness.

> Also, BLOCK_* prefix config options are for block layer
> functionality, hence I suspect this will confuse people because it's
> a filesystem config option. EXPORTFS_BLOCK_OPS seems more obvious
> and correct to me, as the block mapping ops are part of the exportfs
> operations interface....

OK. I agree - that is better.

>>  xfs-$(CONFIG_SYSCTL)		+= xfs_sysctl.o
>>  xfs-$(CONFIG_COMPAT)		+= xfs_ioctl32.o
>> -xfs-$(CONFIG_NFSD_BLOCKLAYOUT)	+= xfs_pnfs.o
>> -xfs-$(CONFIG_NFSD_SCSILAYOUT)	+= xfs_pnfs.o
>> +xfs-$(CONFIG_BLOCK_EXPORT_OPS)	+= xfs_pnfs.o
>
> Why do we need the first patch to XFS anymore? Just convert it
> straight to using CONFIG_EXPORTFS_BLOCK_OPS....

Doing this in a single patch would combine two changes in a single commit:
 - the definition of the extra operations for a config of only SCSI_LAYOUT
 - the addition of CONFIG_EXPORTFS_BLOCK_OPS.

Since the first is the originally intended behavior, and the second fixes it
up, I'll just send it along in a single patch if that's preferred.

Ben