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From: Jeff Layton <jlayton@kernel.org>
To: ceph-devel@vger.kernel.org
Cc: idryomov@gmail.com, pdonnell@redhat.com
Subject: [PATCH 3/6] ceph: drop private list from remove_session_caps_cb
Date: Wed,  8 Sep 2021 09:03:33 -0400	[thread overview]
Message-ID: <20210908130336.56668-4-jlayton@kernel.org> (raw)
In-Reply-To: <20210908130336.56668-1-jlayton@kernel.org>

This function does a lot of list-shuffling with cap flushes, all to
avoid possibly freeing a slab allocation under spinlock (which is
totally ok).  Simplify the code by just detaching and freeing the cap
flushes in place.

Signed-off-by: Jeff Layton <jlayton@kernel.org>
---
 fs/ceph/mds_client.c | 26 ++++++++++----------------
 1 file changed, 10 insertions(+), 16 deletions(-)

diff --git a/fs/ceph/mds_client.c b/fs/ceph/mds_client.c
index b41d62f08c0a..2ff4e6481d09 100644
--- a/fs/ceph/mds_client.c
+++ b/fs/ceph/mds_client.c
@@ -1626,7 +1626,6 @@ static int remove_session_caps_cb(struct inode *inode, struct ceph_cap *cap,
 	struct ceph_fs_client *fsc = (struct ceph_fs_client *)arg;
 	struct ceph_mds_client *mdsc = fsc->mdsc;
 	struct ceph_inode_info *ci = ceph_inode(inode);
-	LIST_HEAD(to_remove);
 	bool dirty_dropped = false;
 	bool invalidate = false;
 	int capsnap_release = 0;
@@ -1645,16 +1644,17 @@ static int remove_session_caps_cb(struct inode *inode, struct ceph_cap *cap,
 				mapping_set_error(&inode->i_data, -EIO);
 		}
 
+		spin_lock(&mdsc->cap_dirty_lock);
+
+		/* trash all of the cap flushes for this inode */
 		while (!list_empty(&ci->i_cap_flush_list)) {
 			cf = list_first_entry(&ci->i_cap_flush_list,
 					      struct ceph_cap_flush, i_list);
-			list_move(&cf->i_list, &to_remove);
-		}
-
-		spin_lock(&mdsc->cap_dirty_lock);
-
-		list_for_each_entry(cf, &to_remove, i_list)
 			list_del_init(&cf->g_list);
+			list_del_init(&cf->i_list);
+			if (!cf->is_capsnap)
+				ceph_free_cap_flush(cf);
+		}
 
 		if (!list_empty(&ci->i_dirty_item)) {
 			pr_warn_ratelimited(
@@ -1697,22 +1697,16 @@ static int remove_session_caps_cb(struct inode *inode, struct ceph_cap *cap,
 		}
 
 		if (!ci->i_dirty_caps && ci->i_prealloc_cap_flush) {
-			list_add(&ci->i_prealloc_cap_flush->i_list, &to_remove);
+			cf = ci->i_prealloc_cap_flush;
 			ci->i_prealloc_cap_flush = NULL;
+			if (!cf->is_capsnap)
+				ceph_free_cap_flush(cf);
 		}
 
 		if (!list_empty(&ci->i_cap_snaps))
 			capsnap_release = remove_capsnaps(mdsc, inode);
 	}
 	spin_unlock(&ci->i_ceph_lock);
-	while (!list_empty(&to_remove)) {
-		struct ceph_cap_flush *cf;
-		cf = list_first_entry(&to_remove,
-				      struct ceph_cap_flush, i_list);
-		list_del_init(&cf->i_list);
-		if (!cf->is_capsnap)
-			ceph_free_cap_flush(cf);
-	}
 
 	wake_up_all(&ci->i_cap_wq);
 	if (invalidate)
-- 
2.31.1


  parent reply	other threads:[~2021-09-08 13:04 UTC|newest]

Thread overview: 7+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-09-08 13:03 [PATCH 0/6] ceph: better error handling for failed async creates Jeff Layton
2021-09-08 13:03 ` [PATCH 1/6] ceph: print inode numbers instead of pointer values Jeff Layton
2021-09-08 13:03 ` [PATCH 2/6] ceph: don't use -ESTALE as special return code in try_get_cap_refs Jeff Layton
2021-09-08 13:03 ` Jeff Layton [this message]
2021-09-08 13:03 ` [PATCH 4/6] ceph: fix auth cap handling logic in remove_session_caps_cb Jeff Layton
2021-09-08 13:03 ` [PATCH 5/6] ceph: refactor remove_session_caps_cb Jeff Layton
2021-09-08 13:03 ` [PATCH 6/6] ceph: shut down access to inode when async create fails Jeff Layton

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