Re: [PATCH v4 14/17] xfs: Add delay context to xfs_da_args

["Darrick J. Wong" <darrick.wong@oracle.com>]

On Wed, Nov 06, 2019 at 06:27:58PM -0700, Allison Collins wrote:
> This patch adds a new struct xfs_delay_context, which we
> will use to keep track of the current state of a delayed
> attribute operation.
> 
> The new enum is used to track various operations that
> are in progress so that we know not to repeat them, and
> resume where we left off before EAGAIN was returned to
> cycle out the transaction.  Other members take the place
> of local variables that need to retain their values
> across multiple function recalls.
> 
> Signed-off-by: Allison Collins <allison.henderson@oracle.com>
> ---
>  fs/xfs/libxfs/xfs_da_btree.h | 28 ++++++++++++++++++++++++++++
>  fs/xfs/scrub/common.c        |  2 ++
>  fs/xfs/xfs_acl.c             |  2 ++
>  fs/xfs/xfs_attr_list.c       |  1 +
>  fs/xfs/xfs_ioctl.c           |  2 ++
>  fs/xfs/xfs_ioctl32.c         |  2 ++
>  fs/xfs/xfs_iops.c            |  2 ++
>  fs/xfs/xfs_xattr.c           |  1 +
>  8 files changed, 40 insertions(+)
> 
> diff --git a/fs/xfs/libxfs/xfs_da_btree.h b/fs/xfs/libxfs/xfs_da_btree.h
> index bed4f40..ef23ed8 100644
> --- a/fs/xfs/libxfs/xfs_da_btree.h
> +++ b/fs/xfs/libxfs/xfs_da_btree.h
> @@ -42,6 +42,33 @@ enum xfs_dacmp {
>  	XFS_CMP_CASE		/* names are same but differ in case */
>  };
>  
> +enum xfs_attr_state {

enum xfs_dc_state ?

Hm, "dc" seems a little short.

enum xfs_delattr_state?

> +	XFS_DC_INIT		= 1, /* Init delay info */
> +	XFS_DC_SF_TO_LEAF	= 2, /* Converted short form to leaf */
> +	XFS_DC_FOUND_LBLK	= 3, /* We found leaf blk for attr */
> +	XFS_DC_LEAF_TO_NODE	= 4, /* Converted leaf to node */
> +	XFS_DC_FOUND_NBLK	= 5, /* We found node blk for attr */
> +	XFS_DC_ALLOC_LEAF	= 6, /* We are allocating leaf blocks */
> +	XFS_DC_ALLOC_NODE	= 7, /* We are allocating node blocks */
> +	XFS_DC_RM_INVALIDATE	= 8, /* We are invalidating blocks */
> +	XFS_DC_RM_SHRINK	= 9, /* We are shrinking the tree */
> +	XFS_DC_RM_NODE_BLKS	= 10,/* We are removing node blocks */
> +};
> +
> +/*
> + * Context used for keeping track of delayed attribute operations
> + */
> +struct xfs_delay_context {

struct xfs_delattr_context ?

> +	enum xfs_attr_state	dc_state;
> +	struct xfs_buf		*leaf_bp;
> +	struct xfs_bmbt_irec	map;
> +	xfs_dablk_t		lblkno;
> +	xfs_fileoff_t		lfileoff;
> +	int			blkcnt;
> +	struct xfs_da_state	*da_state;
> +	struct xfs_da_state_blk *blk;
> +};

Would be kinda nice to keep this structure size to a minimum by
reordering these in order of decreasing size.  pahole is your friend for
doing that (or shouting me down). ;)

But otherwise this seems ok.

--D

> +
>  /*
>   * Structure to ease passing around component names.
>   */
> @@ -69,6 +96,7 @@ typedef struct xfs_da_args {
>  	int		rmtvaluelen2;	/* remote attr value length in bytes */
>  	int		op_flags;	/* operation flags */
>  	enum xfs_dacmp	cmpresult;	/* name compare result for lookups */
> +	struct xfs_delay_context  dc;	/* context used for delay attr ops */
>  } xfs_da_args_t;
>  
>  /*
> diff --git a/fs/xfs/scrub/common.c b/fs/xfs/scrub/common.c
> index 1887605..9a649d1 100644
> --- a/fs/xfs/scrub/common.c
> +++ b/fs/xfs/scrub/common.c
> @@ -24,6 +24,8 @@
>  #include "xfs_rmap_btree.h"
>  #include "xfs_log.h"
>  #include "xfs_trans_priv.h"
> +#include "xfs_da_format.h"
> +#include "xfs_da_btree.h"
>  #include "xfs_attr.h"
>  #include "xfs_reflink.h"
>  #include "scrub/scrub.h"
> diff --git a/fs/xfs/xfs_acl.c b/fs/xfs/xfs_acl.c
> index e868755..1336477 100644
> --- a/fs/xfs/xfs_acl.c
> +++ b/fs/xfs/xfs_acl.c
> @@ -10,6 +10,8 @@
>  #include "xfs_trans_resv.h"
>  #include "xfs_mount.h"
>  #include "xfs_inode.h"
> +#include "xfs_da_format.h"
> +#include "xfs_da_btree.h"
>  #include "xfs_attr.h"
>  #include "xfs_trace.h"
>  #include <linux/posix_acl_xattr.h>
> diff --git a/fs/xfs/xfs_attr_list.c b/fs/xfs/xfs_attr_list.c
> index fab416c..e395864 100644
> --- a/fs/xfs/xfs_attr_list.c
> +++ b/fs/xfs/xfs_attr_list.c
> @@ -12,6 +12,7 @@
>  #include "xfs_trans_resv.h"
>  #include "xfs_mount.h"
>  #include "xfs_da_format.h"
> +#include "xfs_da_btree.h"
>  #include "xfs_inode.h"
>  #include "xfs_trans.h"
>  #include "xfs_bmap.h"
> diff --git a/fs/xfs/xfs_ioctl.c b/fs/xfs/xfs_ioctl.c
> index ae0ed88..23b0ca6 100644
> --- a/fs/xfs/xfs_ioctl.c
> +++ b/fs/xfs/xfs_ioctl.c
> @@ -15,6 +15,8 @@
>  #include "xfs_iwalk.h"
>  #include "xfs_itable.h"
>  #include "xfs_error.h"
> +#include "xfs_da_format.h"
> +#include "xfs_da_btree.h"
>  #include "xfs_attr.h"
>  #include "xfs_bmap.h"
>  #include "xfs_bmap_util.h"
> diff --git a/fs/xfs/xfs_ioctl32.c b/fs/xfs/xfs_ioctl32.c
> index 3c0d518..e3278ac 100644
> --- a/fs/xfs/xfs_ioctl32.c
> +++ b/fs/xfs/xfs_ioctl32.c
> @@ -17,6 +17,8 @@
>  #include "xfs_itable.h"
>  #include "xfs_fsops.h"
>  #include "xfs_rtalloc.h"
> +#include "xfs_da_format.h"
> +#include "xfs_da_btree.h"
>  #include "xfs_attr.h"
>  #include "xfs_ioctl.h"
>  #include "xfs_ioctl32.h"
> diff --git a/fs/xfs/xfs_iops.c b/fs/xfs/xfs_iops.c
> index aef346e..68b9cd0 100644
> --- a/fs/xfs/xfs_iops.c
> +++ b/fs/xfs/xfs_iops.c
> @@ -13,6 +13,8 @@
>  #include "xfs_inode.h"
>  #include "xfs_acl.h"
>  #include "xfs_quota.h"
> +#include "xfs_da_format.h"
> +#include "xfs_da_btree.h"
>  #include "xfs_attr.h"
>  #include "xfs_trans.h"
>  #include "xfs_trace.h"
> diff --git a/fs/xfs/xfs_xattr.c b/fs/xfs/xfs_xattr.c
> index 6c5321d..0f0ebab 100644
> --- a/fs/xfs/xfs_xattr.c
> +++ b/fs/xfs/xfs_xattr.c
> @@ -10,6 +10,7 @@
>  #include "xfs_log_format.h"
>  #include "xfs_da_format.h"
>  #include "xfs_inode.h"
> +#include "xfs_da_btree.h"
>  #include "xfs_attr.h"
>  
>  #include <linux/posix_acl_xattr.h>
> -- 
> 2.7.4
>