On Thu, Apr 30, 2020 at 03:50:06PM -0700, Allison Collins wrote:
> In this patch, we hoist code from xfs_attr_set_args into two new helpers
> xfs_attr_is_shortform and xfs_attr_set_shortform. These two will help
> to simplify xfs_attr_set_args when we get into delayed attrs later.
>
> Signed-off-by: Allison Collins <allison.henderson@xxxxxxxxxx>
> Reviewed-by: Brian Foster <bfoster@xxxxxxxxxx>
> Reviewed-by: Chandan Rajendra <chandanrlinux@xxxxxxxxx>
Looks ok to me,
Reviewed-by: Darrick J. Wong <darrick.wong@xxxxxxxxxx>
--D
> ---
> fs/xfs/libxfs/xfs_attr.c | 107 +++++++++++++++++++++++++++++++----------------
> 1 file changed, 72 insertions(+), 35 deletions(-)
>
> diff --git a/fs/xfs/libxfs/xfs_attr.c b/fs/xfs/libxfs/xfs_attr.c
> index af47566..d112910 100644
> --- a/fs/xfs/libxfs/xfs_attr.c
> +++ b/fs/xfs/libxfs/xfs_attr.c
> @@ -204,6 +204,66 @@ xfs_attr_try_sf_addname(
> }
>
> /*
> + * Check to see if the attr should be upgraded from non-existent or shortform to
> + * single-leaf-block attribute list.
> + */
> +static inline bool
> +xfs_attr_is_shortform(
> + struct xfs_inode *ip)
> +{
> + return ip->i_d.di_aformat == XFS_DINODE_FMT_LOCAL ||
> + (ip->i_d.di_aformat == XFS_DINODE_FMT_EXTENTS &&
> + ip->i_d.di_anextents == 0);
> +}
> +
> +/*
> + * Attempts to set an attr in shortform, or converts short form to leaf form if
> + * there is not enough room. If the attr is set, the transaction is committed
> + * and set to NULL.
> + */
> +STATIC int
> +xfs_attr_set_shortform(
> + struct xfs_da_args *args,
> + struct xfs_buf **leaf_bp)
> +{
> + struct xfs_inode *dp = args->dp;
> + int error, error2 = 0;
> +
> + /*
> + * Try to add the attr to the attribute list in the inode.
> + */
> + error = xfs_attr_try_sf_addname(dp, args);
> + if (error != -ENOSPC) {
> + error2 = xfs_trans_commit(args->trans);
> + args->trans = NULL;
> + return error ? error : error2;
> + }
> + /*
> + * It won't fit in the shortform, transform to a leaf block. GROT:
> + * another possible req'mt for a double-split btree op.
> + */
> + error = xfs_attr_shortform_to_leaf(args, leaf_bp);
> + if (error)
> + return error;
> +
> + /*
> + * Prevent the leaf buffer from being unlocked so that a concurrent AIL
> + * push cannot grab the half-baked leaf buffer and run into problems
> + * with the write verifier. Once we're done rolling the transaction we
> + * can release the hold and add the attr to the leaf.
> + */
> + xfs_trans_bhold(args->trans, *leaf_bp);
> + error = xfs_defer_finish(&args->trans);
> + xfs_trans_bhold_release(args->trans, *leaf_bp);
> + if (error) {
> + xfs_trans_brelse(args->trans, *leaf_bp);
> + return error;
> + }
> +
> + return 0;
> +}
> +
> +/*
> * Set the attribute specified in @args.
> */
> int
> @@ -212,48 +272,25 @@ xfs_attr_set_args(
> {
> struct xfs_inode *dp = args->dp;
> struct xfs_buf *leaf_bp = NULL;
> - int error, error2 = 0;
> + int error = 0;
>
> /*
> - * If the attribute list is non-existent or a shortform list,
> - * upgrade it to a single-leaf-block attribute list.
> + * If the attribute list is already in leaf format, jump straight to
> + * leaf handling. Otherwise, try to add the attribute to the shortform
> + * list; if there's no room then convert the list to leaf format and try
> + * again.
> */
> - if (dp->i_d.di_aformat == XFS_DINODE_FMT_LOCAL ||
> - (dp->i_d.di_aformat == XFS_DINODE_FMT_EXTENTS &&
> - dp->i_d.di_anextents == 0)) {
> + if (xfs_attr_is_shortform(dp)) {
>
> /*
> - * Try to add the attr to the attribute list in the inode.
> + * If the attr was successfully set in shortform, the
> + * transaction is committed and set to NULL. Otherwise, is it
> + * converted from shortform to leaf, and the transaction is
> + * retained.
> */
> - error = xfs_attr_try_sf_addname(dp, args);
> - if (error != -ENOSPC) {
> - error2 = xfs_trans_commit(args->trans);
> - args->trans = NULL;
> - return error ? error : error2;
> - }
> -
> - /*
> - * It won't fit in the shortform, transform to a leaf block.
> - * GROT: another possible req'mt for a double-split btree op.
> - */
> - error = xfs_attr_shortform_to_leaf(args, &leaf_bp);
> - if (error)
> - return error;
> -
> - /*
> - * Prevent the leaf buffer from being unlocked so that a
> - * concurrent AIL push cannot grab the half-baked leaf
> - * buffer and run into problems with the write verifier.
> - * Once we're done rolling the transaction we can release
> - * the hold and add the attr to the leaf.
> - */
> - xfs_trans_bhold(args->trans, leaf_bp);
> - error = xfs_defer_finish(&args->trans);
> - xfs_trans_bhold_release(args->trans, leaf_bp);
> - if (error) {
> - xfs_trans_brelse(args->trans, leaf_bp);
> + error = xfs_attr_set_shortform(args, &leaf_bp);
> + if (error || !args->trans)
> return error;
> - }
> }
>
> if (xfs_bmap_one_block(dp, XFS_ATTR_FORK)) {
> --
> 2.7.4
>
