5.15-stable review patch. If anyone has any objections, please let me know.
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From: Dawei Li set_pte_at@outlook.com
[ Upstream commit b685757c7b08d5073046fb379be965fd6c06aafc ]
For some ops on rpc handle: 1. ksmbd_session_rpc_method(), possibly on high frequency. 2. ksmbd_session_rpc_close().
id is used as indexing key to lookup channel, in that case, linear search based on list may suffer a bit for performance.
Implements sess->rpc_handle_list as xarray.
Signed-off-by: Dawei Li set_pte_at@outlook.com Acked-by: Namjae Jeon linkinjeon@kernel.org Signed-off-by: Steve French stfrench@microsoft.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- fs/ksmbd/mgmt/user_session.c | 37 ++++++++++++++----------------------- fs/ksmbd/mgmt/user_session.h | 2 +- 2 files changed, 15 insertions(+), 24 deletions(-)
--- a/fs/ksmbd/mgmt/user_session.c +++ b/fs/ksmbd/mgmt/user_session.c @@ -25,7 +25,6 @@ static DECLARE_RWSEM(sessions_table_lock struct ksmbd_session_rpc { int id; unsigned int method; - struct list_head list; };
static void free_channel_list(struct ksmbd_session *sess) @@ -58,15 +57,14 @@ static void __session_rpc_close(struct k static void ksmbd_session_rpc_clear_list(struct ksmbd_session *sess) { struct ksmbd_session_rpc *entry; + long index;
- while (!list_empty(&sess->rpc_handle_list)) { - entry = list_entry(sess->rpc_handle_list.next, - struct ksmbd_session_rpc, - list); - - list_del(&entry->list); + xa_for_each(&sess->rpc_handle_list, index, entry) { + xa_erase(&sess->rpc_handle_list, index); __session_rpc_close(sess, entry); } + + xa_destroy(&sess->rpc_handle_list); }
static int __rpc_method(char *rpc_name) @@ -102,13 +100,13 @@ int ksmbd_session_rpc_open(struct ksmbd_
entry = kzalloc(sizeof(struct ksmbd_session_rpc), GFP_KERNEL); if (!entry) - return -EINVAL; + return -ENOMEM;
- list_add(&entry->list, &sess->rpc_handle_list); entry->method = method; entry->id = ksmbd_ipc_id_alloc(); if (entry->id < 0) goto free_entry; + xa_store(&sess->rpc_handle_list, entry->id, entry, GFP_KERNEL);
resp = ksmbd_rpc_open(sess, entry->id); if (!resp) @@ -117,9 +115,9 @@ int ksmbd_session_rpc_open(struct ksmbd_ kvfree(resp); return entry->id; free_id: + xa_erase(&sess->rpc_handle_list, entry->id); ksmbd_rpc_id_free(entry->id); free_entry: - list_del(&entry->list); kfree(entry); return -EINVAL; } @@ -128,24 +126,17 @@ void ksmbd_session_rpc_close(struct ksmb { struct ksmbd_session_rpc *entry;
- list_for_each_entry(entry, &sess->rpc_handle_list, list) { - if (entry->id == id) { - list_del(&entry->list); - __session_rpc_close(sess, entry); - break; - } - } + entry = xa_erase(&sess->rpc_handle_list, id); + if (entry) + __session_rpc_close(sess, entry); }
int ksmbd_session_rpc_method(struct ksmbd_session *sess, int id) { struct ksmbd_session_rpc *entry;
- list_for_each_entry(entry, &sess->rpc_handle_list, list) { - if (entry->id == id) - return entry->method; - } - return 0; + entry = xa_load(&sess->rpc_handle_list, id); + return entry ? entry->method : 0; }
void ksmbd_session_destroy(struct ksmbd_session *sess) @@ -327,7 +318,7 @@ static struct ksmbd_session *__session_c set_session_flag(sess, protocol); xa_init(&sess->tree_conns); xa_init(&sess->ksmbd_chann_list); - INIT_LIST_HEAD(&sess->rpc_handle_list); + xa_init(&sess->rpc_handle_list); sess->sequence_number = 1;
ret = __init_smb2_session(sess); --- a/fs/ksmbd/mgmt/user_session.h +++ b/fs/ksmbd/mgmt/user_session.h @@ -52,7 +52,7 @@ struct ksmbd_session { struct xarray ksmbd_chann_list; struct xarray tree_conns; struct ida tree_conn_ida; - struct list_head rpc_handle_list; + struct xarray rpc_handle_list;
__u8 smb3encryptionkey[SMB3_ENC_DEC_KEY_SIZE]; __u8 smb3decryptionkey[SMB3_ENC_DEC_KEY_SIZE];