linux-kernel - [PATCH AUTOSEL 6.6 01/23] 9p: v9fs_fid_find: also lookup by inode if not found dentry

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Message-ID: <20241023143116.2981369-1-sashal@kernel.org>
Date: Wed, 23 Oct 2024 10:30:45 -0400
From: Sasha Levin <sashal@...nel.org>
To: linux-kernel@...r.kernel.org,
	stable@...r.kernel.org
Cc: Dominique Martinet <asmadeus@...ewreck.org>,
	Christian Schoenebeck <linux_oss@...debyte.com>,
	Sasha Levin <sashal@...nel.org>,
	ericvh@...nel.org,
	lucho@...kov.net,
	v9fs@...ts.linux.dev
Subject: [PATCH AUTOSEL 6.6 01/23] 9p: v9fs_fid_find: also lookup by inode if not found dentry

From: Dominique Martinet <asmadeus@...ewreck.org>

[ Upstream commit 38d222b3163f7b7d737e5d999ffc890a12870e36 ]

It's possible for v9fs_fid_find "find by dentry" branch to not turn up
anything despite having an entry set (because e.g. uid doesn't match),
in which case the calling code will generally make an extra lookup
to the server.

In this case we might have had better luck looking by inode, so fall
back to look up by inode if we have one and the lookup by dentry failed.

Message-Id: <20240523210024.1214386-1-asmadeus@...ewreck.org>
Reviewed-by: Christian Schoenebeck <linux_oss@...debyte.com>
Signed-off-by: Dominique Martinet <asmadeus@...ewreck.org>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 fs/9p/fid.c | 5 ++---
 1 file changed, 2 insertions(+), 3 deletions(-)

diff --git a/fs/9p/fid.c b/fs/9p/fid.c
index de009a33e0e26..f84412290a30c 100644
--- a/fs/9p/fid.c
+++ b/fs/9p/fid.c
@@ -131,10 +131,9 @@ static struct p9_fid *v9fs_fid_find(struct dentry *dentry, kuid_t uid, int any)
 			}
 		}
 		spin_unlock(&dentry->d_lock);
-	} else {
-		if (dentry->d_inode)
-			ret = v9fs_fid_find_inode(dentry->d_inode, false, uid, any);
 	}
+	if (!ret && dentry->d_inode)
+		ret = v9fs_fid_find_inode(dentry->d_inode, false, uid, any);
 
 	return ret;
 }
-- 
2.43.0