Re: [PATCH v4 06/17] xfs: Factor out new helper functions xfs_attr_rmtval_set

Darrick J. Wong
2019-11-08T19:34:51Z

On Wed, Nov 06, 2019 at 06:27:50PM -0700, Allison Collins wrote:
> Break xfs_attr_rmtval_set into two helper functions
> xfs_attr_rmt_find_hole and xfs_attr_rmtval_set_value.
> xfs_attr_rmtval_set rolls the transaction between the
> helpers, but delayed operations cannot. We will use
> the helpers later when constructing new delayed
> attribute routines.
>
> Signed-off-by: Allison Collins <allison.henderson@oracle.com>
> Reviewed-by: Brian Foster <bfoster@redhat.com>

Looks good,
Reviewed-by: Darrick J. Wong <darrick.wong@oracle.com>

--D

> ---
> fs/xfs/libxfs/xfs_attr_remote.c | 71 +++++++++++++++++++++++++++++++----------
> fs/xfs/libxfs/xfs_attr_remote.h | 3 +-
> 2 files changed, 56 insertions(+), 18 deletions(-)
>
> diff --git a/fs/xfs/libxfs/xfs_attr_remote.c b/fs/xfs/libxfs/xfs_attr_remote.c
> index db9247a..db51388 100644
> --- a/fs/xfs/libxfs/xfs_attr_remote.c
> +++ b/fs/xfs/libxfs/xfs_attr_remote.c
> @@ -21,6 +21,7 @@
> #include "xfs_attr.h"
> #include "xfs_trace.h"
> #include "xfs_error.h"
> +#include "xfs_attr_remote.h"
>
> #define ATTR_RMTVALUE_MAPSIZE 1 /* # of map entries at once */
>
> @@ -432,34 +433,20 @@ xfs_attr_rmtval_set(
> struct xfs_da_args *args)
> {
> struct xfs_inode *dp = args->dp;
> - struct xfs_mount *mp = dp->i_mount;
> struct xfs_bmbt_irec map;
> xfs_dablk_t lblkno;
> - xfs_fileoff_t lfileoff = 0;
> - uint8_t *src = args->value;
> int blkcnt;
> - int valuelen;
> int nmap;
> int error;
> - int offset = 0;
>
> trace_xfs_attr_rmtval_set(args);
>
> - /*
> - * Find a "hole" in the attribute address space large enough for
> - * us to drop the new attribute's value into. Because CRC enable
> - * attributes have headers, we can't just do a straight byte to FSB
> - * conversion and have to take the header space into account.
> - */
> - blkcnt = xfs_attr3_rmt_blocks(mp, args->rmtvaluelen);
> - error = xfs_bmap_first_unused(args->trans, args->dp, blkcnt, &lfileoff,
> - XFS_ATTR_FORK);
> + error = xfs_attr_rmt_find_hole(args);
> if (error)
> return error;
>
> - args->rmtblkno = lblkno = (xfs_dablk_t)lfileoff;
> - args->rmtblkcnt = blkcnt;
> -
> + blkcnt = args->rmtblkcnt;
> + lblkno = (xfs_dablk_t)args->rmtblkno;
> /*
> * Roll through the "value", allocating blocks on disk as required.
> */
> @@ -500,6 +487,56 @@ xfs_attr_rmtval_set(
> return error;
> }
>
> + return xfs_attr_rmtval_set_value(args);
> +}
> +
> +
> +/*
> + * Find a "hole" in the attribute address space large enough for us to drop the
> + * new attribute's value into
> + */
> +int
> +xfs_attr_rmt_find_hole(
> + struct xfs_da_args *args)
> +{
> + struct xfs_inode *dp = args->dp;
> + struct xfs_mount *mp = dp->i_mount;
> + int error;
> + int blkcnt;
> + xfs_fileoff_t lfileoff = 0;
> +
> + /*
> + * Because CRC enable attributes have headers, we can't just do a
> + * straight byte to FSB conversion and have to take the header space
> + * into account.
> + */
> + blkcnt = xfs_attr3_rmt_blocks(mp, args->rmtvaluelen);
> + error = xfs_bmap_first_unused(args->trans, args->dp, blkcnt, &lfileoff,
> + XFS_ATTR_FORK);
> + if (error)
> + return error;
> +
> + args->rmtblkno = (xfs_dablk_t)lfileoff;
> + args->rmtblkcnt = blkcnt;
> +
> + return 0;
> +}
> +
> +int
> +xfs_attr_rmtval_set_value(
> + struct xfs_da_args *args)
> +{
> + struct xfs_inode *dp = args->dp;
> + struct xfs_mount *mp = dp->i_mount;
> + struct xfs_bmbt_irec map;
> + xfs_dablk_t lblkno;
> + uint8_t *src = args->value;
> + int blkcnt;
> + int valuelen;
> + int nmap;
> + int error;
> + int offset = 0;
> +
> /*
> * Roll through the "value", copying the attribute value to the
> * already-allocated blocks. Blocks are written synchronously
> diff --git a/fs/xfs/libxfs/xfs_attr_remote.h b/fs/xfs/libxfs/xfs_attr_remote.h
> index 9d20b66..cd7670d 100644
> --- a/fs/xfs/libxfs/xfs_attr_remote.h
> +++ b/fs/xfs/libxfs/xfs_attr_remote.h
> @@ -11,5 +11,6 @@ int xfs_attr3_rmt_blocks(struct xfs_mount *mp, int attrlen);
> int xfs_attr_rmtval_get(struct xfs_da_args *args);
> int xfs_attr_rmtval_set(struct xfs_da_args *args);
> int xfs_attr_rmtval_remove(struct xfs_da_args *args);
> -
> +int xfs_attr_rmtval_set_value(struct xfs_da_args *args);
> +int xfs_attr_rmt_find_hole(struct xfs_da_args *args);
> #endif /* __XFS_ATTR_REMOTE_H__ */
> --
> 2.7.4
>