From: Gautham Ananthakrishna <gautham.ananthakrishna@oracle.com>
To: linux-kernel@vger.kernel.org, linux-fsdevel@vger.kernel.org,
linux-mm@kvack.org
Cc: viro@zeniv.linux.org.uk, matthew.wilcox@oracle.com,
khlebnikov@yandex-team.ru, gautham.ananthakrishna@oracle.com
Subject: [PATCH RFC 5/6] dcache: push releasing dentry lock into sweep_negative
Date: Thu, 21 Jan 2021 18:49:44 +0530 [thread overview]
Message-ID: <1611235185-1685-6-git-send-email-gautham.ananthakrishna@oracle.com> (raw)
In-Reply-To: <1611235185-1685-1-git-send-email-gautham.ananthakrishna@oracle.com>
From: Konstantin Khlebnikov <khlebnikov@yandex-team.ru>
Release the dentry lock inside the sweep_negative() function. This
is in preparation for a follow up patch and doesn't change runtime
behavior.
Signed-off-by: Konstantin Khlebnikov <khlebnikov@yandex-team.ru>
Signed-off-by: Gautham Ananthakrisha <gautham.ananthakrishna@oracle.com>
---
fs/dcache.c | 8 ++++++--
1 file changed, 6 insertions(+), 2 deletions(-)
diff --git a/fs/dcache.c b/fs/dcache.c
index 492a42f..22c990b 100644
--- a/fs/dcache.c
+++ b/fs/dcache.c
@@ -638,13 +638,14 @@ static inline struct dentry *lock_parent(struct dentry *dentry)
* Must be called at dput of negative dentry.
*/
static void sweep_negative(struct dentry *dentry)
+ __releases(dentry->d_lock)
{
struct dentry *parent;
if (!d_is_tail_negative(dentry)) {
parent = lock_parent(dentry);
if (!parent)
- return;
+ goto out;
if (!d_count(dentry) && d_is_negative(dentry) &&
!d_is_tail_negative(dentry)) {
@@ -654,6 +655,8 @@ static void sweep_negative(struct dentry *dentry)
spin_unlock(&parent->d_lock);
}
+out:
+ spin_unlock(&dentry->d_lock);
}
/*
@@ -922,7 +925,8 @@ void dput(struct dentry *dentry)
if (likely(retain_dentry(dentry))) {
if (d_is_negative(dentry))
sweep_negative(dentry);
- spin_unlock(&dentry->d_lock);
+ else
+ spin_unlock(&dentry->d_lock);
return;
}
--
1.8.3.1
next prev parent reply other threads:[~2021-01-21 15:28 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-01-21 13:19 [PATCH RFC 0/6] fix the negative dentres bloating system memory usage Gautham Ananthakrishna
2021-01-21 13:19 ` [PATCH RFC 1/6] dcache: sweep cached negative dentries to the end of list of siblings Gautham Ananthakrishna
2021-04-14 3:00 ` Al Viro
2021-04-15 16:50 ` Al Viro
2021-04-14 3:41 ` Al Viro
2021-04-15 16:25 ` Al Viro
2021-01-21 13:19 ` [PATCH RFC 2/6] fsnotify: stop walking child dentries if remaining tail is negative Gautham Ananthakrishna
2021-01-21 13:19 ` [PATCH RFC 3/6] dcache: add action D_WALK_SKIP_SIBLINGS to d_walk() Gautham Ananthakrishna
2021-01-21 13:19 ` [PATCH RFC 4/6] dcache: stop walking siblings if remaining dentries all negative Gautham Ananthakrishna
2021-01-21 13:19 ` Gautham Ananthakrishna [this message]
2021-01-21 13:19 ` [PATCH RFC 6/6] dcache: prevent flooding with negative dentries Gautham Ananthakrishna
2021-04-14 3:56 ` Al Viro
2021-03-31 14:23 ` [PATCH RFC 0/6] fix the negative dentres bloating system memory usage Matthew Wilcox
2021-04-14 2:40 ` Al Viro
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