linux-kernel - [PATCH] xfs: fix extent length after xfs_alloc_compute

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Message-ID: <20241107070300.13535-1-alexjlzheng@tencent.com>
Date: Thu,  7 Nov 2024 15:03:00 +0800
From: Jinliang Zheng <alexjlzheng@...il.com>
To: dchinner@...hat.com
Cc: djwong@...nel.org,
	chandanbabu@...nel.org,
	linux-xfs@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	Jinliang Zheng <alexjlzheng@...cent.com>
Subject: [PATCH] xfs: fix extent length after xfs_alloc_compute_diff()

After xfs_alloc_compute_diff(), the length of the candidate extent
may change, so make necessary corrections to args->len.

Signed-off-by: Jinliang Zheng <alexjlzheng@...cent.com>
---
 fs/xfs/libxfs/xfs_alloc.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/fs/xfs/libxfs/xfs_alloc.c b/fs/xfs/libxfs/xfs_alloc.c
index 22bdbb3e9980..6a5e6cc7a259 100644
--- a/fs/xfs/libxfs/xfs_alloc.c
+++ b/fs/xfs/libxfs/xfs_alloc.c
@@ -1069,6 +1069,10 @@ xfs_alloc_cur_check(
 	if (bnew == NULLAGBLOCK)
 		goto out;
 
+	args->len = XFS_EXTLEN_MIN(bnoa + lena - bnew, args->maxlen);
+	if (args->len < acur->len)
+		goto out;
+
 	/*
 	 * Deactivate a bnobt cursor with worse locality than the current best.
 	 */
-- 
2.41.1