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authorTejun Heo <tj@kernel.org>2022-08-28 08:04:36 +0300
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2022-09-01 19:08:44 +0300
commit2d7f9f8c1815707e9ddb454648a523efc67a04d3 (patch)
treed630d65175bf01dcfc4fa2119b86e53378fc8733 /fs/kernfs/dir.c
parentbdb2fd7fc56e197a63c0b0e7e07d25d5e20e7c72 (diff)
downloadlinux-2d7f9f8c1815707e9ddb454648a523efc67a04d3.tar.xz
kernfs: Improve kernfs_drain() and always call on removal
__kernfs_remove() was skipping draining based on KERNFS_ACTIVATED - whether the node has ever been activated since creation. Instead, update it to always call kernfs_drain() which now drains or skips based on the precise drain conditions. This ensures that the nodes will be deactivated and drained regardless of their states. This doesn't make meaningful difference now but will enable deactivating and draining nodes dynamically by making removals safe when racing those operations. While at it, drop / update comments. v2: Fix the inverted test on kernfs_should_drain_open_files() noted by Chengming. This was fixed by the next unrelated patch in the previous posting. Cc: Chengming Zhou <zhouchengming@bytedance.com> Tested-by: Chengming Zhou <zhouchengming@bytedance.com> Reviewed-by: Chengming Zhou <zhouchengming@bytedance.com> Signed-off-by: Tejun Heo <tj@kernel.org> Link: https://lore.kernel.org/r/20220828050440.734579-6-tj@kernel.org Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'fs/kernfs/dir.c')
-rw-r--r--fs/kernfs/dir.c24
1 files changed, 12 insertions, 12 deletions
diff --git a/fs/kernfs/dir.c b/fs/kernfs/dir.c
index 8ae44db920d4..b3d2018a334d 100644
--- a/fs/kernfs/dir.c
+++ b/fs/kernfs/dir.c
@@ -472,6 +472,16 @@ static void kernfs_drain(struct kernfs_node *kn)
lockdep_assert_held_write(&root->kernfs_rwsem);
WARN_ON_ONCE(kernfs_active(kn));
+ /*
+ * Skip draining if already fully drained. This avoids draining and its
+ * lockdep annotations for nodes which have never been activated
+ * allowing embedding kernfs_remove() in create error paths without
+ * worrying about draining.
+ */
+ if (atomic_read(&kn->active) == KN_DEACTIVATED_BIAS &&
+ !kernfs_should_drain_open_files(kn))
+ return;
+
up_write(&root->kernfs_rwsem);
if (kernfs_lockdep(kn)) {
@@ -480,7 +490,6 @@ static void kernfs_drain(struct kernfs_node *kn)
lock_contended(&kn->dep_map, _RET_IP_);
}
- /* but everyone should wait for draining */
wait_event(root->deactivate_waitq,
atomic_read(&kn->active) == KN_DEACTIVATED_BIAS);
@@ -1370,23 +1379,14 @@ static void __kernfs_remove(struct kernfs_node *kn)
pos = kernfs_leftmost_descendant(kn);
/*
- * kernfs_drain() drops kernfs_rwsem temporarily and @pos's
+ * kernfs_drain() may drop kernfs_rwsem temporarily and @pos's
* base ref could have been put by someone else by the time
* the function returns. Make sure it doesn't go away
* underneath us.
*/
kernfs_get(pos);
- /*
- * Drain iff @kn was activated. This avoids draining and
- * its lockdep annotations for nodes which have never been
- * activated and allows embedding kernfs_remove() in create
- * error paths without worrying about draining.
- */
- if (kn->flags & KERNFS_ACTIVATED)
- kernfs_drain(pos);
- else
- WARN_ON_ONCE(atomic_read(&kn->active) != KN_DEACTIVATED_BIAS);
+ kernfs_drain(pos);
/*
* kernfs_unlink_sibling() succeeds once per node. Use it