linux-kernel - [PATCH RFC 3/6] dcache: add action D_WALK_SKIP_SIBLINGS to d

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-Id: <1611235185-1685-4-git-send-email-gautham.ananthakrishna@oracle.com>
Date:   Thu, 21 Jan 2021 18:49:42 +0530
From:   Gautham Ananthakrishna <gautham.ananthakrishna@...cle.com>
To:     linux-kernel@...r.kernel.org, linux-fsdevel@...r.kernel.org,
        linux-mm@...ck.org
Cc:     viro@...iv.linux.org.uk, matthew.wilcox@...cle.com,
        khlebnikov@...dex-team.ru, gautham.ananthakrishna@...cle.com
Subject: [PATCH RFC 3/6] dcache: add action D_WALK_SKIP_SIBLINGS to d_walk()

From: Konstantin Khlebnikov <khlebnikov@...dex-team.ru>

This lets skip remaining siblings at seeing d_is_tail_negative().

Signed-off-by: Konstantin Khlebnikov <khlebnikov@...dex-team.ru>
Signed-off-by: Gautham Ananthakrishna <gautham.ananthakrishna@...cle.com>
---
 fs/dcache.c | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/fs/dcache.c b/fs/dcache.c
index a506169..894e6da 100644
--- a/fs/dcache.c
+++ b/fs/dcache.c
@@ -1320,12 +1320,14 @@ void shrink_dcache_sb(struct super_block *sb)
  * @D_WALK_QUIT:	quit walk
  * @D_WALK_NORETRY:	quit when retry is needed
  * @D_WALK_SKIP:	skip this dentry and its children
+ * @D_WALK_SKIP_SIBLINGS: skip siblings and their children
  */
 enum d_walk_ret {
 	D_WALK_CONTINUE,
 	D_WALK_QUIT,
 	D_WALK_NORETRY,
 	D_WALK_SKIP,
+	D_WALK_SKIP_SIBLINGS,
 };
 
 /**
@@ -1356,6 +1358,7 @@ static void d_walk(struct dentry *parent, void *data,
 		break;
 	case D_WALK_QUIT:
 	case D_WALK_SKIP:
+	case D_WALK_SKIP_SIBLINGS:
 		goto out_unlock;
 	case D_WALK_NORETRY:
 		retry = false;
@@ -1387,6 +1390,9 @@ static void d_walk(struct dentry *parent, void *data,
 		case D_WALK_SKIP:
 			spin_unlock(&dentry->d_lock);
 			continue;
+		case D_WALK_SKIP_SIBLINGS:
+			spin_unlock(&dentry->d_lock);
+			goto skip_siblings;
 		}
 
 		if (!list_empty(&dentry->d_subdirs)) {
@@ -1398,6 +1404,7 @@ static void d_walk(struct dentry *parent, void *data,
 		}
 		spin_unlock(&dentry->d_lock);
 	}
+skip_siblings:
 	/*
 	 * All done at this level ... ascend and resume the search.
 	 */
-- 
1.8.3.1