Re: [PATCH 14/47] xfs: enable the xfs_defer mechanism to process extents to free

[Brian Foster <bfoster@redhat.com>]

On Wed, Jul 20, 2016 at 09:57:37PM -0700, Darrick J. Wong wrote:
> Connect the xfs_defer mechanism with the pieces that we'll need to
> handle deferred extent freeing.  We'll wire up the existing code to
> our new deferred mechanism later.
> 
> v2: Move the deferred item code into xfs_trans_extfree.c. (kernel)
> 
> Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
> ---

Reviewed-by: Brian Foster <bfoster@redhat.com>

>  fs/xfs/libxfs/xfs_defer.h  |    1 
>  fs/xfs/xfs_super.c         |    2 +
>  fs/xfs/xfs_trans.h         |    2 +
>  fs/xfs/xfs_trans_extfree.c |  110 ++++++++++++++++++++++++++++++++++++++++++++
>  4 files changed, 115 insertions(+)
> 
> 
> diff --git a/fs/xfs/libxfs/xfs_defer.h b/fs/xfs/libxfs/xfs_defer.h
> index a227bd2..b9b5a92 100644
> --- a/fs/xfs/libxfs/xfs_defer.h
> +++ b/fs/xfs/libxfs/xfs_defer.h
> @@ -51,6 +51,7 @@ struct xfs_defer_pending {
>   * find all the space it needs.
>   */
>  enum xfs_defer_ops_type {
> +	XFS_DEFER_OPS_TYPE_FREE,
>  	XFS_DEFER_OPS_TYPE_MAX,
>  };
>  
> diff --git a/fs/xfs/xfs_super.c b/fs/xfs/xfs_super.c
> index 258b594..ce50474 100644
> --- a/fs/xfs/xfs_super.c
> +++ b/fs/xfs/xfs_super.c
> @@ -1858,6 +1858,8 @@ init_xfs_fs(void)
>  	printk(KERN_INFO XFS_VERSION_STRING " with "
>  			 XFS_BUILD_OPTIONS " enabled\n");
>  
> +	xfs_extent_free_init_defer_op();
> +
>  	xfs_dir_startup();
>  
>  	error = xfs_init_zones();
> diff --git a/fs/xfs/xfs_trans.h b/fs/xfs/xfs_trans.h
> index 5226511..005fbec 100644
> --- a/fs/xfs/xfs_trans.h
> +++ b/fs/xfs/xfs_trans.h
> @@ -209,6 +209,8 @@ void		xfs_trans_ichgtime(struct xfs_trans *, struct xfs_inode *, int);
>  void		xfs_trans_ijoin(struct xfs_trans *, struct xfs_inode *, uint);
>  void		xfs_trans_log_buf(xfs_trans_t *, struct xfs_buf *, uint, uint);
>  void		xfs_trans_log_inode(xfs_trans_t *, struct xfs_inode *, uint);
> +
> +void		xfs_extent_free_init_defer_op(void);
>  struct xfs_efi_log_item	*xfs_trans_get_efi(struct xfs_trans *, uint);
>  void		xfs_trans_log_efi_extent(struct xfs_trans *,
>  					 struct xfs_efi_log_item *,
> diff --git a/fs/xfs/xfs_trans_extfree.c b/fs/xfs/xfs_trans_extfree.c
> index 380cc46..a9f34ee 100644
> --- a/fs/xfs/xfs_trans_extfree.c
> +++ b/fs/xfs/xfs_trans_extfree.c
> @@ -22,10 +22,12 @@
>  #include "xfs_log_format.h"
>  #include "xfs_trans_resv.h"
>  #include "xfs_mount.h"
> +#include "xfs_defer.h"
>  #include "xfs_trans.h"
>  #include "xfs_trans_priv.h"
>  #include "xfs_extfree_item.h"
>  #include "xfs_alloc.h"
> +#include "xfs_bmap.h"
>  
>  /*
>   * This routine is called to allocate an "extent free intention"
> @@ -145,3 +147,111 @@ xfs_trans_free_extent(
>  
>  	return error;
>  }
> +
> +/* Sort bmap items by AG. */
> +static int
> +xfs_extent_free_diff_items(
> +	void				*priv,
> +	struct list_head		*a,
> +	struct list_head		*b)
> +{
> +	struct xfs_mount		*mp = priv;
> +	struct xfs_bmap_free_item	*ra;
> +	struct xfs_bmap_free_item	*rb;
> +
> +	ra = container_of(a, struct xfs_bmap_free_item, xbfi_list);
> +	rb = container_of(b, struct xfs_bmap_free_item, xbfi_list);
> +	return  XFS_FSB_TO_AGNO(mp, ra->xbfi_startblock) -
> +		XFS_FSB_TO_AGNO(mp, rb->xbfi_startblock);
> +}
> +
> +/* Get an EFI. */
> +STATIC void *
> +xfs_extent_free_create_intent(
> +	struct xfs_trans		*tp,
> +	unsigned int			count)
> +{
> +	return xfs_trans_get_efi(tp, count);
> +}
> +
> +/* Log a free extent to the intent item. */
> +STATIC void
> +xfs_extent_free_log_item(
> +	struct xfs_trans		*tp,
> +	void				*intent,
> +	struct list_head		*item)
> +{
> +	struct xfs_bmap_free_item	*free;
> +
> +	free = container_of(item, struct xfs_bmap_free_item, xbfi_list);
> +	xfs_trans_log_efi_extent(tp, intent, free->xbfi_startblock,
> +			free->xbfi_blockcount);
> +}
> +
> +/* Get an EFD so we can process all the free extents. */
> +STATIC void *
> +xfs_extent_free_create_done(
> +	struct xfs_trans		*tp,
> +	void				*intent,
> +	unsigned int			count)
> +{
> +	return xfs_trans_get_efd(tp, intent, count);
> +}
> +
> +/* Process a free extent. */
> +STATIC int
> +xfs_extent_free_finish_item(
> +	struct xfs_trans		*tp,
> +	struct xfs_defer_ops		*dop,
> +	struct list_head		*item,
> +	void				*done_item,
> +	void				**state)
> +{
> +	struct xfs_bmap_free_item	*free;
> +	int				error;
> +
> +	free = container_of(item, struct xfs_bmap_free_item, xbfi_list);
> +	error = xfs_trans_free_extent(tp, done_item,
> +			free->xbfi_startblock,
> +			free->xbfi_blockcount);
> +	kmem_free(free);
> +	return error;
> +}
> +
> +/* Abort all pending EFIs. */
> +STATIC void
> +xfs_extent_free_abort_intent(
> +	void				*intent)
> +{
> +	xfs_efi_release(intent);
> +}
> +
> +/* Cancel a free extent. */
> +STATIC void
> +xfs_extent_free_cancel_item(
> +	struct list_head		*item)
> +{
> +	struct xfs_bmap_free_item	*free;
> +
> +	free = container_of(item, struct xfs_bmap_free_item, xbfi_list);
> +	kmem_free(free);
> +}
> +
> +static const struct xfs_defer_op_type xfs_extent_free_defer_type = {
> +	.type		= XFS_DEFER_OPS_TYPE_FREE,
> +	.max_items	= XFS_EFI_MAX_FAST_EXTENTS,
> +	.diff_items	= xfs_extent_free_diff_items,
> +	.create_intent	= xfs_extent_free_create_intent,
> +	.abort_intent	= xfs_extent_free_abort_intent,
> +	.log_item	= xfs_extent_free_log_item,
> +	.create_done	= xfs_extent_free_create_done,
> +	.finish_item	= xfs_extent_free_finish_item,
> +	.cancel_item	= xfs_extent_free_cancel_item,
> +};
> +
> +/* Register the deferred op type. */
> +void
> +xfs_extent_free_init_defer_op(void)
> +{
> +	xfs_defer_init_op_type(&xfs_extent_free_defer_type);
> +}
> 
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