linux-kernel - [PATCH v3 11/21] __dentry_kill(): get consistent rules for victim's refcount

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Message-Id: <20231124060422.576198-11-viro@zeniv.linux.org.uk>
Date:   Fri, 24 Nov 2023 06:04:12 +0000
From:   Al Viro <viro@...iv.linux.org.uk>
To:     linux-fsdevel@...r.kernel.org
Cc:     Linus Torvalds <torvalds@...ux-foundation.org>,
        Christian Brauner <brauner@...nel.org>,
        linux-kernel@...r.kernel.org
Subject: [PATCH v3 11/21] __dentry_kill(): get consistent rules for victim's refcount

Currently we call it with refcount equal to 1 when called from
dentry_kill(); all other callers have it equal to 0.

Make it always be called with zero refcount; on this step we
just decrement it before the calls in dentry_kill().  That is
safe, since all places that care about the value of refcount
either do that under ->d_lock or hold a reference to dentry
in question.  Either is sufficient to prevent observing a
dentry immediately prior to __dentry_kill() getting called
from dentry_kill().

Reviewed-by: Christian Brauner <brauner@...nel.org>
Signed-off-by: Al Viro <viro@...iv.linux.org.uk>
---
 fs/dcache.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/fs/dcache.c b/fs/dcache.c
index 2e74f3f2ce2e..b527db8e5901 100644
--- a/fs/dcache.c
+++ b/fs/dcache.c
@@ -729,6 +729,7 @@ static struct dentry *dentry_kill(struct dentry *dentry)
 			goto slow_positive;
 		}
 	}
+	dentry->d_lockref.count--;
 	__dentry_kill(dentry);
 	return parent;
 
@@ -741,6 +742,7 @@ static struct dentry *dentry_kill(struct dentry *dentry)
 	if (unlikely(dentry->d_lockref.count != 1)) {
 		dentry->d_lockref.count--;
 	} else if (likely(!retain_dentry(dentry))) {
+		dentry->d_lockref.count--;
 		__dentry_kill(dentry);
 		return parent;
 	} else {
-- 
2.39.2