linux-kernel - [PATCH] fuse: fix return value of inode_inline_reclaim_one

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Date:   Mon, 24 Apr 2023 20:32:50 +0800
From:   Jingbo Xu <jefflexu@...ux.alibaba.com>
To:     miklos@...redi.hu, vgoyal@...hat.com, linux-fsdevel@...r.kernel.org
Cc:     gerry@...ux.alibaba.com, linux-kernel@...r.kernel.org
Subject: [PATCH] fuse: fix return value of inode_inline_reclaim_one_dmap in error path

When range already got reclaimed by somebody else, return NULL so that
the caller could retry to allocate or reclaim another range, instead of
mistakenly returning the range already got reclaimed and reused by
others.

Reported-by: Liu Jiang <gerry@...ux.alibaba.com>
Fixes: 9a752d18c85a ("virtiofs: add logic to free up a memory range")
Signed-off-by: Jingbo Xu <jefflexu@...ux.alibaba.com>
---
 fs/fuse/dax.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/fs/fuse/dax.c b/fs/fuse/dax.c
index 8e74f278a3f6..59aadfd89ee5 100644
--- a/fs/fuse/dax.c
+++ b/fs/fuse/dax.c
@@ -985,6 +985,7 @@ inode_inline_reclaim_one_dmap(struct fuse_conn_dax *fcd, struct inode *inode,
 	node = interval_tree_iter_first(&fi->dax->tree, start_idx, start_idx);
 	/* Range already got reclaimed by somebody else */
 	if (!node) {
+		dmap = NULL;
 		if (retry)
 			*retry = true;
 		goto out_write_dmap_sem;
-- 
2.19.1.6.gb485710b