[PATCH 3.16 072/328] fuse: flush requests on umount

Ben Hutchings
2018-12-09T22:09:48Z

From: Miklos Szeredi <mszeredi@suse.cz>

commit 580640ba5d331eb5631a5de46941c98f5ed90886 upstream.

Use fuse_abort_conn() instead of fuse_conn_kill() in fuse_put_super().
This flushes and aborts requests still on any queues. But since we've
already reset fc->connected, those requests would not be useful anyway and
would be flushed when the fuse device is closed.

Next patches will rely on requests being flushed before the superblock is
destroyed.

Use fuse_abort_conn() in cuse_process_init_reply() too, since it makes no
difference there, and we can get rid of fuse_conn_kill().

Signed-off-by: Miklos Szeredi <mszeredi@suse.cz>
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
---
fs/fuse/cuse.c | 2 +-
fs/fuse/fuse_i.h | 2 --
fs/fuse/inode.c | 16 +---------------
3 files changed, 2 insertions(+), 18 deletions(-)

--- a/fs/fuse/cuse.c
+++ b/fs/fuse/cuse.c
@@ -415,7 +415,7 @@ err_unlock:
err_region:
unregister_chrdev_region(devt, 1);
err:
- fuse_conn_kill(fc);
+ fuse_abort_conn(fc);
goto out;
}

--- a/fs/fuse/fuse_i.h
+++ b/fs/fuse/fuse_i.h
@@ -804,8 +804,6 @@ void fuse_invalidate_atime(struct inode
*/
struct fuse_conn *fuse_conn_get(struct fuse_conn *fc);

-void fuse_conn_kill(struct fuse_conn *fc);
-
/**
* Initialize fuse_conn
*/
--- a/fs/fuse/inode.c
+++ b/fs/fuse/inode.c
@@ -376,27 +376,13 @@ static void fuse_bdi_destroy(struct fuse
bdi_destroy(&fc->bdi);
}

-void fuse_conn_kill(struct fuse_conn *fc)
-{
- spin_lock(&fc->lock);
- fc->connected = 0;
- fc->blocked = 0;
- fc->initialized = 1;
- spin_unlock(&fc->lock);
- /* Flush all readers on this fs */
- kill_fasync(&fc->fasync, SIGIO, POLL_IN);
- wake_up_all(&fc->waitq);
- wake_up_all(&fc->blocked_waitq);
-}
-EXPORT_SYMBOL_GPL(fuse_conn_kill);
-
static void fuse_put_super(struct super_block *sb)
{
struct fuse_conn *fc = get_fuse_conn_super(sb);

fuse_send_destroy(fc);

- fuse_conn_kill(fc);
+ fuse_abort_conn(fc);
mutex_lock(&fuse_mutex);
list_del(&fc->entry);
fuse_ctl_remove_conn(fc);