diff mbox series

[v3,5/9] cachefiles: stop sending new request when dropping object

Message ID 20240628062930.2467993-6-libaokun@huaweicloud.com (mailing list archive)
State New
Headers show
Series cachefiles: random bugfixes | expand

Commit Message

Baokun Li June 28, 2024, 6:29 a.m. UTC 
From: Baokun Li <libaokun1@huawei.com>

Added CACHEFILES_ONDEMAND_OBJSTATE_DROPPING indicates that the cachefiles
object is being dropped, and is set after the close request for the dropped
object completes, and no new requests are allowed to be sent after this
state.

This prepares for the later addition of cancel_work_sync(). It prevents
leftover reopen requests from being sent, to avoid processing unnecessary
requests and to avoid cancel_work_sync() blocking by waiting for daemon to
complete the reopen requests.

Signed-off-by: Baokun Li <libaokun1@huawei.com>
Acked-by: Jeff Layton <jlayton@kernel.org>
---
 fs/cachefiles/internal.h |  2 ++
 fs/cachefiles/ondemand.c | 10 ++++++++--
 2 files changed, 10 insertions(+), 2 deletions(-)

Comments

Gao Xiang June 28, 2024, 6:51 a.m. UTC | #1 
On 2024/6/28 14:29, libaokun@huaweicloud.com wrote:
> From: Baokun Li <libaokun1@huawei.com>
> 
> Added CACHEFILES_ONDEMAND_OBJSTATE_DROPPING indicates that the cachefiles
> object is being dropped, and is set after the close request for the dropped
> object completes, and no new requests are allowed to be sent after this
> state.
> 
> This prepares for the later addition of cancel_work_sync(). It prevents
> leftover reopen requests from being sent, to avoid processing unnecessary
> requests and to avoid cancel_work_sync() blocking by waiting for daemon to
> complete the reopen requests.
> 
> Signed-off-by: Baokun Li <libaokun1@huawei.com>
> Acked-by: Jeff Layton <jlayton@kernel.org>

LGTM,
Reviewed-by: Gao Xiang <hsiangkao@linux.alibaba.com>

Thanks,
Gao Xiang
diff mbox series

Patch

diff --git a/fs/cachefiles/internal.h b/fs/cachefiles/internal.h
index 6845a90cdfcc..a1a1d25e9514 100644
--- a/fs/cachefiles/internal.h
+++ b/fs/cachefiles/internal.h
@@ -48,6 +48,7 @@  enum cachefiles_object_state {
 	CACHEFILES_ONDEMAND_OBJSTATE_CLOSE, /* Anonymous fd closed by daemon or initial state */
 	CACHEFILES_ONDEMAND_OBJSTATE_OPEN, /* Anonymous fd associated with object is available */
 	CACHEFILES_ONDEMAND_OBJSTATE_REOPENING, /* Object that was closed and is being reopened. */
+	CACHEFILES_ONDEMAND_OBJSTATE_DROPPING, /* Object is being dropped. */
 };
 
 struct cachefiles_ondemand_info {
@@ -335,6 +336,7 @@  cachefiles_ondemand_set_object_##_state(struct cachefiles_object *object) \
 CACHEFILES_OBJECT_STATE_FUNCS(open, OPEN);
 CACHEFILES_OBJECT_STATE_FUNCS(close, CLOSE);
 CACHEFILES_OBJECT_STATE_FUNCS(reopening, REOPENING);
+CACHEFILES_OBJECT_STATE_FUNCS(dropping, DROPPING);
 
 static inline bool cachefiles_ondemand_is_reopening_read(struct cachefiles_req *req)
 {
diff --git a/fs/cachefiles/ondemand.c b/fs/cachefiles/ondemand.c
index bce005f2b456..8a3b52c3ebba 100644
--- a/fs/cachefiles/ondemand.c
+++ b/fs/cachefiles/ondemand.c
@@ -517,7 +517,8 @@  static int cachefiles_ondemand_send_req(struct cachefiles_object *object,
 		 */
 		xas_lock(&xas);
 
-		if (test_bit(CACHEFILES_DEAD, &cache->flags)) {
+		if (test_bit(CACHEFILES_DEAD, &cache->flags) ||
+		    cachefiles_ondemand_object_is_dropping(object)) {
 			xas_unlock(&xas);
 			ret = -EIO;
 			goto out;
@@ -568,7 +569,8 @@  static int cachefiles_ondemand_send_req(struct cachefiles_object *object,
 	 * If error occurs after creating the anonymous fd,
 	 * cachefiles_ondemand_fd_release() will set object to close.
 	 */
-	if (opcode == CACHEFILES_OP_OPEN)
+	if (opcode == CACHEFILES_OP_OPEN &&
+	    !cachefiles_ondemand_object_is_dropping(object))
 		cachefiles_ondemand_set_object_close(object);
 	kfree(req);
 	return ret;
@@ -667,8 +669,12 @@  int cachefiles_ondemand_init_object(struct cachefiles_object *object)
 
 void cachefiles_ondemand_clean_object(struct cachefiles_object *object)
 {
+	if (!object->ondemand)
+		return;
+
 	cachefiles_ondemand_send_req(object, CACHEFILES_OP_CLOSE, 0,
 			cachefiles_ondemand_init_close_req, NULL);
+	cachefiles_ondemand_set_object_dropping(object);
 }
 
 int cachefiles_ondemand_init_obj_info(struct cachefiles_object *object,