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From: Brian Foster <bfoster@redhat.com>
To: linux-xfs@vger.kernel.org
Cc: Matt Fleming <matt@readmodwrite.com>
Subject: [PATCH 1/2] xfs: set minleft correctly for sparse chunk errortag allocation
Date: Fri, 31 Jul 2026 12:33:36 -0400	[thread overview]
Message-ID: <20260731163337.152522-2-bfoster@redhat.com> (raw)
In-Reply-To: <20260731163337.152522-1-bfoster@redhat.com>

The errortag instrumentation for forced sparse chunk allocation
jumps straight to the allocation path without setting args.minleft.
minleft is unconditionally set to ->inobt_maxlevels for the normal
allocation path. Lift the assignment to the initial args setup so
it covers all possible paths.

Assisted-by: LLM
Fixes: 1cdadee11f8d ("xfs: randomly do sparse inode allocations in DEBUG mode")
Signed-off-by: Brian Foster <bfoster@redhat.com>
---
 fs/xfs/libxfs/xfs_ialloc.c | 10 ++++------
 1 file changed, 4 insertions(+), 6 deletions(-)

diff --git a/fs/xfs/libxfs/xfs_ialloc.c b/fs/xfs/libxfs/xfs_ialloc.c
index ffcdd1f691fd..633b2d6e42c5 100644
--- a/fs/xfs/libxfs/xfs_ialloc.c
+++ b/fs/xfs/libxfs/xfs_ialloc.c
@@ -733,6 +733,10 @@ xfs_ialloc_ag_alloc(
 							igeo->maxicount)
 		return -ENOSPC;
 	args.minlen = args.maxlen = igeo->ialloc_blks;
+
+	/* Allow space for the inode btree to split. */
+	args.minleft = igeo->inobt_maxlevels;
+
 	/*
 	 * First try to allocate inodes contiguous with the last-allocated
 	 * chunk of inodes.  If the filesystem is striped, this will fill
@@ -764,8 +768,6 @@ xfs_ialloc_ag_alloc(
 		args.alignment = 1;
 		args.minalignslop = igeo->cluster_align - 1;
 
-		/* Allow space for the inode btree to split. */
-		args.minleft = igeo->inobt_maxlevels;
 		error = xfs_alloc_vextent_exact_bno(&args,
 				xfs_agbno_to_fsb(pag, args.agbno));
 		if (error)
@@ -804,10 +806,6 @@ xfs_ialloc_ag_alloc(
 		 * Allocate a fixed-size extent of inodes.
 		 */
 		args.prod = 1;
-		/*
-		 * Allow space for the inode btree to split.
-		 */
-		args.minleft = igeo->inobt_maxlevels;
 		error = xfs_alloc_vextent_near_bno(&args,
 				xfs_agbno_to_fsb(pag,
 					be32_to_cpu(agi->agi_root)));
-- 
2.55.0


  reply	other threads:[~2026-07-31 16:33 UTC|newest]

Thread overview: 7+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2026-07-31 16:33 [PATCH 0/2] xfs: fix a couple sparse chunk alloc problems Brian Foster
2026-07-31 16:33 ` Brian Foster [this message]
2026-07-31 18:02   ` [External] : [PATCH 1/2] xfs: set minleft correctly for sparse chunk errortag allocation Mark Tinguely
2026-07-31 18:40     ` Brian Foster
2026-07-31 16:33 ` [PATCH 2/2] xfs: consistent low ag space behavior for sparse inode chunk allocs Brian Foster
2026-07-31 17:54   ` [External] : " Mark Tinguely
2026-08-01  0:11   ` Dave Chinner

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