Currently when acquiring an sb for virtiofs fuse_mount_get() is being
called from virtio_fs_set_super() if a new sb is being filled and
fuse_mount_put() is called unconditionally after sget_fc() returns.
The exact same result can be obtained by checking whether
fs_contex->s_fs_info was set to NULL (ref trasferred to sb->s_fs_info) and
only calling fuse_mount_put() if the ref wasn't transferred (error or
matching sb found).
This allows getting rid of virtio_fs_set_super() and fuse_mount_get().
Signed-off-by: Miklos Szeredi <mszeredi@redhat.com>
*/
void fuse_conn_put(struct fuse_conn *fc);
-/**
- * Acquire reference to fuse_mount
- */
-struct fuse_mount *fuse_mount_get(struct fuse_mount *fm);
-
/**
* Release reference to fuse_mount
*/
}
EXPORT_SYMBOL_GPL(fuse_mount_put);
-struct fuse_mount *fuse_mount_get(struct fuse_mount *fm)
-{
- refcount_inc(&fm->count);
- return fm;
-}
-EXPORT_SYMBOL_GPL(fuse_mount_get);
-
static struct inode *fuse_get_root_inode(struct super_block *sb, unsigned mode)
{
struct fuse_attr attr;
return fsc_fm->fc->iq.priv == sb_fm->fc->iq.priv;
}
-static int virtio_fs_set_super(struct super_block *sb,
- struct fs_context *fsc)
-{
- int err;
-
- err = get_anon_bdev(&sb->s_dev);
- if (!err)
- fuse_mount_get(fsc->s_fs_info);
-
- return err;
-}
-
static int virtio_fs_get_tree(struct fs_context *fsc)
{
struct virtio_fs *fs;
fc->auto_submounts = true;
fsc->s_fs_info = fm;
- sb = sget_fc(fsc, virtio_fs_test_super, virtio_fs_set_super);
- fuse_mount_put(fm);
+ sb = sget_fc(fsc, virtio_fs_test_super, set_anon_super_fc);
+ if (fsc->s_fs_info)
+ fuse_mount_put(fm);
if (IS_ERR(sb))
return PTR_ERR(sb);