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[2003:dc:6f04:b700:230:64ff:fe74:809]) by smtp.gmail.com with ESMTPSA id ffacd0b85a97d-4858bcefd59sm26232785f8f.19.2026.09.07.14.23.29 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 07 Sep 2026 14:23:29 -0700 (PDT) From: Max Kellermann To: idryomov@gmail.com, amarkuze@redhat.com, xiubo.li@clyso.com, ceph-devel@vger.kernel.org, linux-kernel@vger.kernel.org Cc: Max Kellermann Subject: [PATCH] ceph: skip alias lookup when trimming non-directory caps Date: Mon, 7 Sep 2026 23:23:25 +0200 Message-ID: <20260907212325.508739-1-max.kellermann@ionos.com> X-Mailer: git-send-email 2.47.3 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit drop_negative_children() only does anything for directories; for other inodes it returns true unconditionally. The d_find_any_alias() and dput() pair around it is therefore pure overhead for regular files: an extra `i_lock`, a dget()/dput(), and a ceph_d_delete() check for zero-refcount dentries. Only look up aliases for directories and prune other inodes directly. d_prune_aliases() kills the same dentries either way. Side effect: a non-directory inode without any alias now counts as trimmed if the iterator holds the last reference. That is okay, since with inode_just_drop it is evicted as soon as that reference goes away. Signed-off-by: Max Kellermann --- fs/ceph/mds_client.c | 30 ++++++++++++++++++------------ 1 file changed, 18 insertions(+), 12 deletions(-) diff --git a/fs/ceph/mds_client.c b/fs/ceph/mds_client.c index 085ae0cfb5f7..81cb1e9b9769 100644 --- a/fs/ceph/mds_client.c +++ b/fs/ceph/mds_client.c @@ -2315,22 +2315,28 @@ static int trim_caps_cb(struct inode *inode, int mds, void *arg) ceph_remove_cap(mdsc, cap, ci, true); (*remaining)--; } else { - struct dentry *dentry; + int count; + /* try dropping referring dentries */ spin_unlock(&ci->i_ceph_lock); - dentry = d_find_any_alias(inode); - if (dentry && drop_negative_children(dentry)) { - int count; - dput(dentry); - d_prune_aliases(inode); - count = icount_read_once(inode); - if (count == 1) - (*remaining)--; - doutc(cl, "%p %llx.%llx cap %p pruned, count now %d\n", - inode, ceph_vinop(inode), cap, count); - } else { + if (S_ISDIR(inode->i_mode)) { + struct dentry *dentry = d_find_any_alias(inode); + bool prune; + + if (!dentry) + return 0; + prune = drop_negative_children(dentry); dput(dentry); + if (!prune) + return 0; } + /* The iterator's inode reference is sufficient to prune aliases. */ + d_prune_aliases(inode); + count = icount_read_once(inode); + if (count == 1) + (*remaining)--; + doutc(cl, "%p %llx.%llx cap %p pruned, count now %d\n", + inode, ceph_vinop(inode), cap, count); return 0; } -- 2.47.3