On Mon, 14 Nov 2016 07:32:56 -0500
Li Qiang <liq...@gmail.com> wrote:
> From: Li Qiang <liq...@gmail.com>
>
> Currently, the backend of VirtFS doesn't have a cleanup
> function. This will lead resource leak issues if the backed
> driver allocates resources. This patch addresses this issue.
>
> Signed-off-by: Li Qiang <liq...@gmail.com>
> ---
> fsdev/file-op-9p.h | 1 +
> hw/9pfs/9p.c | 3 +++
> 2 files changed, 4 insertions(+)
>
> diff --git a/fsdev/file-op-9p.h b/fsdev/file-op-9p.h
> index 6db9fea..a56dc84 100644
> --- a/fsdev/file-op-9p.h
> +++ b/fsdev/file-op-9p.h
> @@ -100,6 +100,7 @@ struct FileOperations
> {
> int (*parse_opts)(QemuOpts *, struct FsDriverEntry *);
> int (*init)(struct FsContext *);
> + void (*cleanup)(struct FsContext *);
> int (*lstat)(FsContext *, V9fsPath *, struct stat *);
> ssize_t (*readlink)(FsContext *, V9fsPath *, char *, size_t);
> int (*chmod)(FsContext *, V9fsPath *, FsCred *);
> diff --git a/hw/9pfs/9p.c b/hw/9pfs/9p.c
> index aea7e9d..166b5a7 100644
> --- a/hw/9pfs/9p.c
> +++ b/hw/9pfs/9p.c
> @@ -3532,6 +3532,9 @@ void v9fs_device_unrealize_common(V9fsState *s, Error
> **errp)
> {
> g_free(s->ctx.fs_root);
> g_free(s->tag);
> + if (s->ops->cleanup) {
> + s->ops->cleanup(&s->ctx);
> + }
Unrealize should undo things that were set during realize in reverse order:
please move the cleanup stuff above calls to g_free() (which are actually
misordered since tag is allocated after fs_root... maybe you can fix that
too in a preparatory patch).
You also have to call cleanup in the error path of realize if init was
called.
> }
>
> typedef struct VirtfsCoResetData {
