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

To: Benjamin Coddington <bcodding@xxxxxxxxxx>
Subject: Re: [PATCH 2/2] xfs: abstract block export operations from nfsd layouts
From: "J. Bruce Fields" <bfields@xxxxxxxxxxxx>
Date: Thu, 7 Jul 2016 11:43:40 -0400
Cc: xfs@xxxxxxxxxxx, linux-fsdevel@xxxxxxxxxxxxxxx, linux-nfs@xxxxxxxxxxxxxxx, Alexander Viro <viro@xxxxxxxxxxxxxxxxxx>, Dave Chinner <david@xxxxxxxxxxxxx>, Christoph Hellwig <hch@xxxxxx>
Delivered-to: xfs@xxxxxxxxxxx
In-reply-to: <073be10a55e5e952adbfd320abcce075fb3958ae.1467889001.git.bcodding@xxxxxxxxxx>
References: <5ff05b585226b689866f4604adddffc94910f63f.1467889001.git.bcodding@xxxxxxxxxx> <073be10a55e5e952adbfd320abcce075fb3958ae.1467889001.git.bcodding@xxxxxxxxxx>
User-agent: Mutt/1.5.21 (2010-09-15)
Fine by me.  Dave, I'm happy to take it through the nfsd tree, or if you
want to take it, feel free to add my

        Acked-by: J. Bruce Fields <bfields@xxxxxxxxxx>

I'm OK either way.

--b.

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@xxxxxxxxxx>
> ---
>  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
> +
>  config FILE_LOCKING
>       bool "Enable POSIX file locking API" if EXPERT
>       default y
> diff --git a/fs/nfsd/Kconfig b/fs/nfsd/Kconfig
> index c9f583d7bac8..fb63f93cd5f1 100644
> --- a/fs/nfsd/Kconfig
> +++ b/fs/nfsd/Kconfig
> @@ -90,6 +90,7 @@ config NFSD_BLOCKLAYOUT
>       bool "NFSv4.1 server support for pNFS block layouts"
>       depends on NFSD_V4 && BLOCK
>       select NFSD_PNFS
> +     select BLOCK_EXPORT_OPS
>       help
>         This option enables support for the exporting pNFS block layouts
>         in the kernel's NFS server. The pNFS block layout enables NFS
> @@ -102,6 +103,7 @@ config NFSD_SCSILAYOUT
>       bool "NFSv4.1 server support for pNFS SCSI layouts"
>       depends on NFSD_V4 && BLOCK
>       select NFSD_PNFS
> +     select BLOCK_EXPORT_OPS
>       help
>         This option enables support for the exporting pNFS SCSI layouts
>         in the kernel's NFS server. The pNFS SCSI layout enables NFS
> diff --git a/fs/xfs/Makefile b/fs/xfs/Makefile
> index 3542d94fddce..9c9f039e2f05 100644
> --- a/fs/xfs/Makefile
> +++ b/fs/xfs/Makefile
> @@ -121,5 +121,4 @@ xfs-$(CONFIG_XFS_RT)              += xfs_rtalloc.o
>  xfs-$(CONFIG_XFS_POSIX_ACL)  += xfs_acl.o
>  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
> diff --git a/fs/xfs/xfs_export.c b/fs/xfs/xfs_export.c
> index b08a5541f292..7b1896ef9112 100644
> --- a/fs/xfs/xfs_export.c
> +++ b/fs/xfs/xfs_export.c
> @@ -246,7 +246,7 @@ const struct export_operations xfs_export_operations = {
>       .fh_to_parent           = xfs_fs_fh_to_parent,
>       .get_parent             = xfs_fs_get_parent,
>       .commit_metadata        = xfs_fs_nfs_commit_metadata,
> -#if defined(CONFIG_NFSD_BLOCKLAYOUT) || defined(CONFIG_NFSD_SCSILAYOUT)
> +#ifdef CONFIG_BLOCK_EXPORT_OPS
>       .get_uuid               = xfs_fs_get_uuid,
>       .map_blocks             = xfs_fs_map_blocks,
>       .commit_blocks          = xfs_fs_commit_blocks,
> diff --git a/fs/xfs/xfs_pnfs.h b/fs/xfs/xfs_pnfs.h
> index 93f74853961b..1073f08cd668 100644
> --- a/fs/xfs/xfs_pnfs.h
> +++ b/fs/xfs/xfs_pnfs.h
> @@ -1,7 +1,7 @@
>  #ifndef _XFS_PNFS_H
>  #define _XFS_PNFS_H 1
>  
> -#if defined(CONFIG_NFSD_BLOCKLAYOUT) || defined(CONFIG_NFSD_SCSILAYOUT)
> +#ifdef CONFIG_BLOCK_EXPORT_OPS
>  int xfs_fs_get_uuid(struct super_block *sb, u8 *buf, u32 *len, u64 *offset);
>  int xfs_fs_map_blocks(struct inode *inode, loff_t offset, u64 length,
>               struct iomap *iomap, bool write, u32 *device_generation);
> @@ -15,5 +15,5 @@ xfs_break_layouts(struct inode *inode, uint *iolock, bool 
> with_imutex)
>  {
>       return 0;
>  }
> -#endif /* CONFIG_NFSD_PNFS */
> +#endif /* CONFIG_BLOCK_EXPORT_OPS */
>  #endif /* _XFS_PNFS_H */
> -- 
> 2.5.5

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