Re: [PATCH 4/4] fsfreeze: return EINTR from mnt_want_write and mnt_want_write_file

[Jan Kara <jack@suse.cz>]

On Fri 26-04-13 10:53:27, Marco Stornelli wrote:
> Replaced sb_start_write with sb_start_write_killable inside
> mnt_want_write and mnt_want_write_file.
  The patch looks good. You can add:
Reviewed-by: Jan Kara <jack@suse.cz>
							Honza
> 
> Signed-off-by: Marco Stornelli <marco.stornelli@gmail.com>
> ---
>  fs/namei.c     |    6 ++++++
>  fs/namespace.c |    8 ++++++--
>  ipc/mqueue.c   |    6 +++++-
>  3 files changed, 17 insertions(+), 3 deletions(-)
> 
> diff --git a/fs/namei.c b/fs/namei.c
> index 57ae9c8..5f239fd 100644
> --- a/fs/namei.c
> +++ b/fs/namei.c
> @@ -2750,6 +2750,8 @@ static int do_last(struct nameidata *nd, struct path *path,
>  retry_lookup:
>  	if (op->open_flag & (O_CREAT | O_TRUNC | O_WRONLY | O_RDWR)) {
>  		error = mnt_want_write(nd->path.mnt);
> +		if (error == -EINTR)
> +			goto out;
>  		if (!error)
>  			got_write = true;
>  		/*
> @@ -3053,6 +3055,10 @@ struct dentry *kern_path_create(int dfd, const char *pathname,
>  
>  	/* don't fail immediately if it's r/o, at least try to report other errors */
>  	err2 = mnt_want_write(nd.path.mnt);
> +	if (err2 == -EINTR) {
> +		dentry = ERR_PTR(-EINTR);
> +		goto out;
> +	}
>  	/*
>  	 * Do the final lookup.
>  	 */
> diff --git a/fs/namespace.c b/fs/namespace.c
> index af73554..db09ecb 100644
> --- a/fs/namespace.c
> +++ b/fs/namespace.c
> @@ -344,7 +344,9 @@ int mnt_want_write(struct vfsmount *m)
>  {
>  	int ret;
>  
> -	sb_start_write(m->mnt_sb);
> +	ret = sb_start_write_killable(m->mnt_sb);
> +	if (ret < 0)
> +		return ret;
>  	ret = __mnt_want_write(m);
>  	if (ret)
>  		sb_end_write(m->mnt_sb);
> @@ -404,7 +406,9 @@ int mnt_want_write_file(struct file *file)
>  {
>  	int ret;
>  
> -	sb_start_write(file->f_path.mnt->mnt_sb);
> +	ret = sb_start_write_killable(file->f_path.mnt->mnt_sb);
> +	if (ret < 0)
> +		return ret;
>  	ret = __mnt_want_write_file(file);
>  	if (ret)
>  		sb_end_write(file->f_path.mnt->mnt_sb);
> diff --git a/ipc/mqueue.c b/ipc/mqueue.c
> index e4e47f6..e8fdc03 100644
> --- a/ipc/mqueue.c
> +++ b/ipc/mqueue.c
> @@ -800,7 +800,11 @@ SYSCALL_DEFINE4(mq_open, const char __user *, u_name, int, oflag, umode_t, mode,
>  	if (fd < 0)
>  		goto out_putname;
>  
> -	ro = mnt_want_write(mnt);	/* we'll drop it in any case */
> +	ro = mnt_want_write(mnt);
> +	if (ro == -EINTR) {
> +		fd = ro;
> +		goto out_putname;
> +	}
>  	error = 0;
>  	mutex_lock(&root->d_inode->i_mutex);
>  	path.dentry = lookup_one_len(name->name, root, strlen(name->name));
> -- 
> 1.7.3.4
-- 
Jan Kara <jack@suse.cz>
SUSE Labs, CR