[PATCH v3 2/2] FUSE: Retire superblock on force unmount

Daniil Lunev
2022-05-30T01:40:54Z

Force unmount of FUSE severes the connection with the user space, even
if there are still open files. Subsequent remount tries to re-use the
superblock held by the open files, which is meaningless in the FUSE case
after disconnect - reused super block doesn't have userspace counterpart
attached to it and is incapable of doing any IO.

Signed-off-by: Daniil Lunev <dlunev@chromium.org>

---

Changes in v3:
- No changes

Changes in v2:
- Use an exported function instead of directly modifying superblock

fs/fuse/inode.c | 7 +++++--
1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/fs/fuse/inode.c b/fs/fuse/inode.c
index 8c0665c5dff88..8875361544b2a 100644
--- a/fs/fuse/inode.c
+++ b/fs/fuse/inode.c
@@ -476,8 +476,11 @@ static void fuse_umount_begin(struct super_block *sb)
{
struct fuse_conn *fc = get_fuse_conn_super(sb);

- if (!fc->no_force_umount)
- fuse_abort_conn(fc);
+ if (fc->no_force_umount)
+ return;
+
+ fuse_abort_conn(fc);
+ retire_super(sb);
}

static void fuse_send_destroy(struct fuse_mount *fm)
--
2.31.0