[Devel] Re: [PATCH] Checkpoint and restore task->fs->umask

[Serge E. Hallyn]

Quoting Dan Smith (danms at us.ibm.com):
> Without this, a task's umask will likely be different before and after
> a c/r cycle.  Since the user is able to set their umask to anything
> (within reason) this is a rather trivial addition.
> 
> Signed-off-by: Dan Smith <danms at us.ibm.com>

Acked-by: Serge E. Hallyn <serge at hallyn.com>

> ---
>  fs/checkpoint.c                |   18 +++++++++++++-----
>  include/linux/checkpoint_hdr.h |    1 +
>  2 files changed, 14 insertions(+), 5 deletions(-)
> 
> diff --git a/fs/checkpoint.c b/fs/checkpoint.c
> index 70248b1..08b727f 100644
> --- a/fs/checkpoint.c
> +++ b/fs/checkpoint.c
> @@ -418,6 +418,9 @@ static int checkpoint_fs(struct ckpt_ctx *ctx, void *ptr)
>  	h = ckpt_hdr_get_type(ctx, sizeof(*h), CKPT_HDR_FS);
>  	if (!h)
>  		return -ENOMEM;
> +
> +	h->umask = fs->umask;
> +
>  	ret = ckpt_write_obj(ctx, &h->h);
>  	ckpt_hdr_put(ctx, h);
>  	if (ret)
> @@ -984,18 +987,21 @@ static int restore_cwd(struct ckpt_ctx *ctx, struct fs_struct *fs, char *name)
>  static void *restore_fs(struct ckpt_ctx *ctx)
>  {
>  	struct ckpt_hdr_fs *h;
> -	struct fs_struct *fs;
> +	struct fs_struct *fs = NULL;
>  	char *path;
>  	int ret = 0;
>  
>  	h = ckpt_read_obj_type(ctx, sizeof(*h), CKPT_HDR_FS);
>  	if (IS_ERR(h))
>  		return ERR_PTR(PTR_ERR(h));
> -	ckpt_hdr_put(ctx, h);
>  
>  	fs = copy_fs_struct(current->fs);
> -	if (!fs)
> -		return ERR_PTR(-ENOMEM);
> +	if (!fs) {
> +		ret = -ENOMEM;
> +		goto out;
> +	}
> +
> +	fs->umask = h->umask & S_IRWXUGO;
>  
>  	ret = ckpt_read_fname(ctx, &path);
>  	if (ret < 0)
> @@ -1012,8 +1018,10 @@ static void *restore_fs(struct ckpt_ctx *ctx)
>  	kfree(path);
>  
>  out:
> +	ckpt_hdr_put(ctx, h);
>  	if (ret) {
> -		free_fs_struct(fs);
> +		if (fs)
> +			free_fs_struct(fs);
>  		return ERR_PTR(ret);
>  	}
>  	return fs;
> diff --git a/include/linux/checkpoint_hdr.h b/include/linux/checkpoint_hdr.h
> index 16b1723..a0eb2bb 100644
> --- a/include/linux/checkpoint_hdr.h
> +++ b/include/linux/checkpoint_hdr.h
> @@ -524,6 +524,7 @@ enum restart_block_type {
>  /* file system */
>  struct ckpt_hdr_fs {
>  	struct ckpt_hdr h;
> +	__u32 umask;
>  	/* char *fs_root */
>  	/* char *fs_pwd */
>  } __attribute__((aligned(8)));
> -- 
> 1.7.1.1
> 
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