xfs: use xfs_alloc_vextent_first_ag() where appropriate

Change obvious callers of single AG allocation to use
xfs_alloc_vextent_first_ag(). This gets rid of
XFS_ALLOCTYPE_FIRST_AG as the type used within
xfs_alloc_vextent_first_ag() during iteration is _THIS_AG. Hence we
can remove the setting of args->type from all the callers of
_first_ag() and remove the alloctype.

While doing this, pass the allocation target fsb as a parameter
rather than encoding it in args->fsbno. This starts the process
of making args->fsbno an output only variable rather than
input/output.

Signed-off-by: Dave Chinner <dchinner@redhat.com>
Reviewed-by: Darrick J. Wong <djwong@kernel.org>

1 files changed, 18 insertions, 15 deletions

diff --git a/fs/xfs/libxfs/xfs_alloc.c b/fs/xfs/libxfs/xfs_alloc.c
index 7e4452c11421..bd77e645398b 100644
--- a/fs/xfs/libxfs/xfs_alloc.c
+++ b/fs/xfs/libxfs/xfs_alloc.c
@@ -3183,7 +3183,8 @@ xfs_alloc_read_agf(
  */
 static int
 xfs_alloc_vextent_check_args(
-	struct xfs_alloc_arg	*args)
+	struct xfs_alloc_arg	*args,
+	xfs_fsblock_t		target)
 {
 	struct xfs_mount	*mp = args->mp;
 	xfs_agblock_t		agsize;
@@ -3201,13 +3202,13 @@ xfs_alloc_vextent_check_args(
 		args->maxlen = agsize;
 	if (args->alignment == 0)
 		args->alignment = 1;
-	ASSERT(XFS_FSB_TO_AGNO(mp, args->fsbno) < mp->m_sb.sb_agcount);
-	ASSERT(XFS_FSB_TO_AGBNO(mp, args->fsbno) < agsize);
+	ASSERT(XFS_FSB_TO_AGNO(mp, target) < mp->m_sb.sb_agcount);
+	ASSERT(XFS_FSB_TO_AGBNO(mp, target) < agsize);
 	ASSERT(args->minlen <= args->maxlen);
 	ASSERT(args->minlen <= agsize);
 	ASSERT(args->mod < args->prod);
-	if (XFS_FSB_TO_AGNO(mp, args->fsbno) >= mp->m_sb.sb_agcount ||
-	    XFS_FSB_TO_AGBNO(mp, args->fsbno) >= agsize ||
+	if (XFS_FSB_TO_AGNO(mp, target) >= mp->m_sb.sb_agcount ||
+	    XFS_FSB_TO_AGBNO(mp, target) >= agsize ||
 	    args->minlen > args->maxlen || args->minlen > agsize ||
 	    args->mod >= args->prod) {
 		args->fsbno = NULLFSBLOCK;
@@ -3281,7 +3282,7 @@ xfs_alloc_vextent_this_ag(
 	if (args->tp->t_highest_agno != NULLAGNUMBER)
 		minimum_agno = args->tp->t_highest_agno;
 
-	error = xfs_alloc_vextent_check_args(args);
+	error = xfs_alloc_vextent_check_args(args, args->fsbno);
 	if (error) {
 		if (error == -ENOSPC)
 			return 0;
@@ -3406,7 +3407,7 @@ xfs_alloc_vextent_start_ag(
 	bool			bump_rotor = false;
 	int			error;
 
-	error = xfs_alloc_vextent_check_args(args);
+	error = xfs_alloc_vextent_check_args(args, args->fsbno);
 	if (error) {
 		if (error == -ENOSPC)
 			return 0;
@@ -3444,25 +3445,29 @@ xfs_alloc_vextent_start_ag(
  * filesystem attempting blocking allocation. This does not wrap or try a second
  * pass, so will not recurse into AGs lower than indicated by fsbno.
  */
-static int
+int
 xfs_alloc_vextent_first_ag(
 	struct xfs_alloc_arg	*args,
-	xfs_agnumber_t		minimum_agno)
-{
+	xfs_fsblock_t		target)
+ {
 	struct xfs_mount	*mp = args->mp;
+	xfs_agnumber_t		minimum_agno = 0;
 	xfs_agnumber_t		start_agno;
 	int			error;
 
-	error = xfs_alloc_vextent_check_args(args);
+	if (args->tp->t_highest_agno != NULLAGNUMBER)
+		minimum_agno = args->tp->t_highest_agno;
+
+	error = xfs_alloc_vextent_check_args(args, target);
 	if (error) {
 		if (error == -ENOSPC)
 			return 0;
 		return error;
 	}
 
-	start_agno = max(minimum_agno, XFS_FSB_TO_AGNO(mp, args->fsbno));
-
+	start_agno = max(minimum_agno, XFS_FSB_TO_AGNO(mp, target));
 	args->type = XFS_ALLOCTYPE_THIS_AG;
+	args->fsbno = target;
 	error =  xfs_alloc_vextent_iterate_ags(args, minimum_agno,
 			start_agno, 0);
 	xfs_alloc_vextent_set_fsbno(args, minimum_agno);
@@ -3495,8 +3500,6 @@ xfs_alloc_vextent(
 		break;
 	case XFS_ALLOCTYPE_START_BNO:
 		return xfs_alloc_vextent_start_ag(args, minimum_agno);
-	case XFS_ALLOCTYPE_FIRST_AG:
-		return xfs_alloc_vextent_first_ag(args, minimum_agno);
 	default:
 		error = -EFSCORRUPTED;
 		ASSERT(0);