From cef8c8b249023fb8129ae791e0998cbca771f96a Mon Sep 17 00:00:00 2001 From: yangyun50 <149988609+yangyun50@users.noreply.github.com> Date: Tue, 4 Jun 2024 19:50:48 +0800 Subject: Add support for no_interrupt (#956) The function fuse_session_process_buf_int() would do much things for FUSE_INTERRUPT requests, even there are no FUSE_INTERRUPT requests: 1. check every non-FUSE_INTERRUPT request and add these requests to the linked list(se->list) under a big lock(se->lock). 2. the function fuse_free_req() frees every request and remove them from the linked list(se->list) under a bing lock(se->lock). These operations are not meaningful when there are no FUSE_INTERRUPT requests, and have a great impact on the performance of fuse filesystem because the big lock for each request. In some cases, FUSE_INTERRUPT requests are infrequent, even none at all. Besides, the user-defined filesystem may do nothing for FUSE_INTERRUPT requests. And the kernel side has the option "no_interrupt" in struct fuse_conn. This kernel option can be enabled by return ENOSYS in libfuse for the reply of FUSE_INTERRUPT request. But I don't find the code to enable the "no_interrupt" kernel option in libfuse. So add the no_interrupt support, and when this operaion is enabled: 1. remove the useless locking operaions and list operations. 2. return ENOSYS for the reply of FUSE_INTERRUPT request to inform the kernel to disable FUSE_INTERRUPT request. --- lib/fuse.c | 4 ++++ 1 file changed, 4 insertions(+) (limited to 'lib/fuse.c') diff --git a/lib/fuse.c b/lib/fuse.c index 8617168..4f06da7 100644 --- a/lib/fuse.c +++ b/lib/fuse.c @@ -2612,6 +2612,10 @@ static void fuse_lib_init(void *data, struct fuse_conn_info *conn) if(conn->capable & FUSE_CAP_EXPORT_SUPPORT) conn->want |= FUSE_CAP_EXPORT_SUPPORT; fuse_fs_init(f->fs, conn, &f->conf); + + /* Disable the receiving and processing of FUSE_INTERRUPT requests */ + if (!f->conf.intr) + conn->no_interrupt = 1; } void fuse_fs_destroy(struct fuse_fs *fs) -- cgit v1.2.3