xfs: use xfs_alloc_vextent_this_ag() where appropriate

Change obvious callers of single AG allocation to use
xfs_alloc_vextent_this_ag(). Drive the per-ag grabbing out to the
callers, too, so that callers with active references don't need
to do new lookups just for an allocation in a context that already
has a perag reference.

The only remaining caller that does single AG allocation through
xfs_alloc_vextent() is xfs_bmap_btalloc() with
XFS_ALLOCTYPE_NEAR_BNO. That is going to need more untangling before
it can be converted cleanly.

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

8 files changed, 72 insertions, 52 deletions

diff --git a/fs/xfs/libxfs/xfs_ag.c b/fs/xfs/libxfs/xfs_ag.c
index a3bdcde95845..053d77a283f7 100644
--- a/fs/xfs/libxfs/xfs_ag.c
+++ b/fs/xfs/libxfs/xfs_ag.c
@@ -887,6 +887,7 @@ xfs_ag_shrink_space(
 	struct xfs_alloc_arg	args = {
 		.tp	= *tpp,
 		.mp	= mp,
+		.pag	= pag,
 		.type	= XFS_ALLOCTYPE_THIS_BNO,
 		.minlen = delta,
 		.maxlen = delta,
@@ -938,7 +939,7 @@ xfs_ag_shrink_space(
 		return error;
 
 	/* internal log shouldn't also show up in the free space btrees */
-	error = xfs_alloc_vextent(&args);
+	error = xfs_alloc_vextent_this_ag(&args);
 	if (!error && args.agbno == NULLAGBLOCK)
 		error = -ENOSPC;
 
diff --git a/fs/xfs/libxfs/xfs_alloc.c b/fs/xfs/libxfs/xfs_alloc.c
index edcbf8fd10ea..7e4452c11421 100644
--- a/fs/xfs/libxfs/xfs_alloc.c
+++ b/fs/xfs/libxfs/xfs_alloc.c
@@ -2723,7 +2723,6 @@ xfs_alloc_fix_freelist(
 	targs.agbp = agbp;
 	targs.agno = args->agno;
 	targs.alignment = targs.minlen = targs.prod = 1;
-	targs.type = XFS_ALLOCTYPE_THIS_AG;
 	targs.pag = pag;
 	error = xfs_alloc_read_agfl(pag, tp, &agflbp);
 	if (error)
@@ -3271,14 +3270,17 @@ xfs_alloc_vextent_set_fsbno(
 /*
  * Allocate within a single AG only.
  */
-static int
+int
 xfs_alloc_vextent_this_ag(
-	struct xfs_alloc_arg	*args,
-	xfs_agnumber_t		minimum_agno)
+	struct xfs_alloc_arg	*args)
 {
 	struct xfs_mount	*mp = args->mp;
+	xfs_agnumber_t		minimum_agno = 0;
 	int			error;
 
+	if (args->tp->t_highest_agno != NULLAGNUMBER)
+		minimum_agno = args->tp->t_highest_agno;
+
 	error = xfs_alloc_vextent_check_args(args);
 	if (error) {
 		if (error == -ENOSPC)
@@ -3293,11 +3295,8 @@ xfs_alloc_vextent_this_ag(
 		return 0;
 	}
 
-	args->pag = xfs_perag_get(mp, args->agno);
 	error = xfs_alloc_ag_vextent(args);
-
 	xfs_alloc_vextent_set_fsbno(args, minimum_agno);
-	xfs_perag_put(args->pag);
 	return error;
 }
 
@@ -3480,6 +3479,7 @@ xfs_alloc_vextent(
 	struct xfs_alloc_arg	*args)
 {
 	xfs_agnumber_t		minimum_agno = 0;
+	int			error;
 
 	if (args->tp->t_highest_agno != NULLAGNUMBER)
 		minimum_agno = args->tp->t_highest_agno;
@@ -3488,17 +3488,21 @@ xfs_alloc_vextent(
 	case XFS_ALLOCTYPE_THIS_AG:
 	case XFS_ALLOCTYPE_NEAR_BNO:
 	case XFS_ALLOCTYPE_THIS_BNO:
-		return xfs_alloc_vextent_this_ag(args, minimum_agno);
+		args->pag = xfs_perag_get(args->mp,
+				XFS_FSB_TO_AGNO(args->mp, args->fsbno));
+		error = xfs_alloc_vextent_this_ag(args);
+		xfs_perag_put(args->pag);
+		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);
-		/* NOTREACHED */
+		break;
 	}
-	/* Should never get here */
-	return -EFSCORRUPTED;
+	return error;
 }
 
 /* Ensure that the freelist is at full capacity. */
diff --git a/fs/xfs/libxfs/xfs_alloc.h b/fs/xfs/libxfs/xfs_alloc.h
index 2c3f762dfb58..0a9ad6cd18e2 100644
--- a/fs/xfs/libxfs/xfs_alloc.h
+++ b/fs/xfs/libxfs/xfs_alloc.h
@@ -125,6 +125,12 @@ xfs_alloc_vextent(
 	xfs_alloc_arg_t	*args);	/* allocation argument structure */
 
 /*
+ * Allocate an extent in the specific AG defined by args->fsbno. If there is no
+ * space in that AG, then the allocation will fail.
+ */
+int xfs_alloc_vextent_this_ag(struct xfs_alloc_arg *args);
+
+/*
  * Free an extent.
  */
 int				/* error */
diff --git a/fs/xfs/libxfs/xfs_bmap.c b/fs/xfs/libxfs/xfs_bmap.c
index 87ad56e034c0..baf11bc4d091 100644
--- a/fs/xfs/libxfs/xfs_bmap.c
+++ b/fs/xfs/libxfs/xfs_bmap.c
@@ -789,6 +789,8 @@ xfs_bmap_local_to_extents(
 	memset(&args, 0, sizeof(args));
 	args.tp = tp;
 	args.mp = ip->i_mount;
+	args.total = total;
+	args.minlen = args.maxlen = args.prod = 1;
 	xfs_rmap_ino_owner(&args.oinfo, ip->i_ino, whichfork, 0);
 	/*
 	 * Allocate a block.  We know we need only one, since the
@@ -3506,8 +3508,7 @@ xfs_bmap_btalloc(
 	xfs_extlen_t		orig_length;
 	xfs_extlen_t		blen;
 	xfs_extlen_t		nextminlen = 0;
-	int			isaligned;
-	int			tryagain;
+	int			isaligned = 0;
 	int			error;
 	int			stripe_align;
 
@@ -3528,7 +3529,6 @@ xfs_bmap_btalloc(
 
 	xfs_bmap_adjacent(ap);
 
-	tryagain = isaligned = 0;
 	args.fsbno = ap->blkno;
 	args.oinfo = XFS_RMAP_OINFO_SKIP_UPDATE;
 
@@ -3576,9 +3576,9 @@ xfs_bmap_btalloc(
 			 * allocation with alignment turned on.
 			 */
 			atype = args.type;
-			tryagain = 1;
 			args.type = XFS_ALLOCTYPE_THIS_BNO;
 			args.alignment = 1;
+
 			/*
 			 * Compute the minlen+alignment for the
 			 * next case.  Set slop so that the value
@@ -3595,34 +3595,37 @@ xfs_bmap_btalloc(
 					args.minlen - 1;
 			else
 				args.minalignslop = 0;
+
+			args.pag = xfs_perag_get(mp,
+					XFS_FSB_TO_AGNO(mp, args.fsbno));
+			error = xfs_alloc_vextent_this_ag(&args);
+			xfs_perag_put(args.pag);
+			if (error)
+				return error;
+
+			if (args.fsbno != NULLFSBLOCK)
+				goto out_success;
+			/*
+			 * Exact allocation failed. Now try with alignment
+			 * turned on.
+			 */
+			args.pag = NULL;
+			args.type = atype;
+			args.fsbno = ap->blkno;
+			args.alignment = stripe_align;
+			args.minlen = nextminlen;
+			args.minalignslop = 0;
+			isaligned = 1;
 		}
 	} else {
 		args.alignment = 1;
 		args.minalignslop = 0;
 	}
-	args.minleft = ap->minleft;
-	args.wasdel = ap->wasdel;
-	args.resv = XFS_AG_RESV_NONE;
-	args.datatype = ap->datatype;
 
 	error = xfs_alloc_vextent(&args);
 	if (error)
 		return error;
 
-	if (tryagain && args.fsbno == NULLFSBLOCK) {
-		/*
-		 * Exact allocation failed. Now try with alignment
-		 * turned on.
-		 */
-		args.type = atype;
-		args.fsbno = ap->blkno;
-		args.alignment = stripe_align;
-		args.minlen = nextminlen;
-		args.minalignslop = 0;
-		isaligned = 1;
-		if ((error = xfs_alloc_vextent(&args)))
-			return error;
-	}
 	if (isaligned && args.fsbno == NULLFSBLOCK) {
 		/*
 		 * allocation failed, so turn off alignment and
@@ -3650,8 +3653,13 @@ xfs_bmap_btalloc(
 			return error;
 		ap->tp->t_flags |= XFS_TRANS_LOWMODE;
 	}
+	args.minleft = ap->minleft;
+	args.wasdel = ap->wasdel;
+	args.resv = XFS_AG_RESV_NONE;
+	args.datatype = ap->datatype;
 
 	if (args.fsbno != NULLFSBLOCK) {
+out_success:
 		xfs_bmap_process_allocated_extent(ap, &args, orig_offset,
 			orig_length);
 	} else {
diff --git a/fs/xfs/libxfs/xfs_bmap_btree.c b/fs/xfs/libxfs/xfs_bmap_btree.c
index afd9b2d962a3..d42c1a1da1fc 100644
--- a/fs/xfs/libxfs/xfs_bmap_btree.c
+++ b/fs/xfs/libxfs/xfs_bmap_btree.c
@@ -21,6 +21,7 @@
 #include "xfs_quota.h"
 #include "xfs_trace.h"
 #include "xfs_rmap.h"
+#include "xfs_ag.h"
 
 static struct kmem_cache	*xfs_bmbt_cur_cache;
 
@@ -200,14 +201,18 @@ xfs_bmbt_alloc_block(
 	union xfs_btree_ptr		*new,
 	int				*stat)
 {
-	xfs_alloc_arg_t		args;		/* block allocation args */
-	int			error;		/* error return value */
+	struct xfs_alloc_arg	args;
+	int			error;
 
 	memset(&args, 0, sizeof(args));
 	args.tp = cur->bc_tp;
 	args.mp = cur->bc_mp;
 	xfs_rmap_ino_bmbt_owner(&args.oinfo, cur->bc_ino.ip->i_ino,
 			cur->bc_ino.whichfork);
+	args.minlen = args.maxlen = args.prod = 1;
+	args.wasdel = cur->bc_ino.flags & XFS_BTCUR_BMBT_WASDEL;
+	if (!args.wasdel && args.tp->t_blk_res == 0)
+		return -ENOSPC;
 
 	args.fsbno = be64_to_cpu(start->l);
 	args.type = XFS_ALLOCTYPE_START_BNO;
@@ -222,15 +227,9 @@ xfs_bmbt_alloc_block(
 		args.minleft = xfs_bmapi_minleft(cur->bc_tp, cur->bc_ino.ip,
 					cur->bc_ino.whichfork);
 
-	args.minlen = args.maxlen = args.prod = 1;
-	args.wasdel = cur->bc_ino.flags & XFS_BTCUR_BMBT_WASDEL;
-	if (!args.wasdel && args.tp->t_blk_res == 0) {
-		error = -ENOSPC;
-		goto error0;
-	}
 	error = xfs_alloc_vextent(&args);
 	if (error)
-		goto error0;
+		return error;
 
 	if (args.fsbno == NULLFSBLOCK && args.minleft) {
 		/*
@@ -243,7 +242,7 @@ xfs_bmbt_alloc_block(
 		args.type = XFS_ALLOCTYPE_START_BNO;
 		error = xfs_alloc_vextent(&args);
 		if (error)
-			goto error0;
+			return error;
 		cur->bc_tp->t_flags |= XFS_TRANS_LOWMODE;
 	}
 	if (WARN_ON_ONCE(args.fsbno == NULLFSBLOCK)) {
@@ -262,9 +261,6 @@ xfs_bmbt_alloc_block(
 
 	*stat = 1;
 	return 0;
-
- error0:
-	return error;
 }
 
 STATIC int
diff --git a/fs/xfs/libxfs/xfs_ialloc.c b/fs/xfs/libxfs/xfs_ialloc.c
index 20d2365524a4..74ad88853a8c 100644
--- a/fs/xfs/libxfs/xfs_ialloc.c
+++ b/fs/xfs/libxfs/xfs_ialloc.c
@@ -630,6 +630,7 @@ xfs_ialloc_ag_alloc(
 	args.mp = tp->t_mountp;
 	args.fsbno = NULLFSBLOCK;
 	args.oinfo = XFS_RMAP_OINFO_INODES;
+	args.pag = pag;
 
 #ifdef DEBUG
 	/* randomly do sparse inode allocations */
@@ -683,7 +684,8 @@ xfs_ialloc_ag_alloc(
 
 		/* Allow space for the inode btree to split. */
 		args.minleft = igeo->inobt_maxlevels;
-		if ((error = xfs_alloc_vextent(&args)))
+		error = xfs_alloc_vextent_this_ag(&args);
+		if (error)
 			return error;
 
 		/*
@@ -731,7 +733,8 @@ xfs_ialloc_ag_alloc(
 		 * Allow space for the inode btree to split.
 		 */
 		args.minleft = igeo->inobt_maxlevels;
-		if ((error = xfs_alloc_vextent(&args)))
+		error = xfs_alloc_vextent_this_ag(&args);
+		if (error)
 			return error;
 	}
 
@@ -780,7 +783,7 @@ sparse_alloc:
 					    args.mp->m_sb.sb_inoalignmt) -
 				 igeo->ialloc_blks;
 
-		error = xfs_alloc_vextent(&args);
+		error = xfs_alloc_vextent_this_ag(&args);
 		if (error)
 			return error;
 
diff --git a/fs/xfs/libxfs/xfs_ialloc_btree.c b/fs/xfs/libxfs/xfs_ialloc_btree.c
index 3675a0d29310..fa6cd2502970 100644
--- a/fs/xfs/libxfs/xfs_ialloc_btree.c
+++ b/fs/xfs/libxfs/xfs_ialloc_btree.c
@@ -103,6 +103,7 @@ __xfs_inobt_alloc_block(
 	memset(&args, 0, sizeof(args));
 	args.tp = cur->bc_tp;
 	args.mp = cur->bc_mp;
+	args.pag = cur->bc_ag.pag;
 	args.oinfo = XFS_RMAP_OINFO_INOBT;
 	args.fsbno = XFS_AGB_TO_FSB(args.mp, cur->bc_ag.pag->pag_agno, sbno);
 	args.minlen = 1;
@@ -111,7 +112,7 @@ __xfs_inobt_alloc_block(
 	args.type = XFS_ALLOCTYPE_NEAR_BNO;
 	args.resv = resv;
 
-	error = xfs_alloc_vextent(&args);
+	error = xfs_alloc_vextent_this_ag(&args);
 	if (error)
 		return error;
 
diff --git a/fs/xfs/libxfs/xfs_refcount_btree.c b/fs/xfs/libxfs/xfs_refcount_btree.c
index d20abf0390fc..a980fb18bde2 100644
--- a/fs/xfs/libxfs/xfs_refcount_btree.c
+++ b/fs/xfs/libxfs/xfs_refcount_btree.c
@@ -67,6 +67,7 @@ xfs_refcountbt_alloc_block(
 	memset(&args, 0, sizeof(args));
 	args.tp = cur->bc_tp;
 	args.mp = cur->bc_mp;
+	args.pag = cur->bc_ag.pag;
 	args.type = XFS_ALLOCTYPE_NEAR_BNO;
 	args.fsbno = XFS_AGB_TO_FSB(cur->bc_mp, cur->bc_ag.pag->pag_agno,
 			xfs_refc_block(args.mp));
@@ -74,7 +75,7 @@ xfs_refcountbt_alloc_block(
 	args.minlen = args.maxlen = args.prod = 1;
 	args.resv = XFS_AG_RESV_METADATA;
 
-	error = xfs_alloc_vextent(&args);
+	error = xfs_alloc_vextent_this_ag(&args);
 	if (error)
 		goto out_error;
 	trace_xfs_refcountbt_alloc_block(cur->bc_mp, cur->bc_ag.pag->pag_agno,