diff mbox series

[5/5] fs: remove do_mounts

Message ID 20200917082236.2518236-6-hch@lst.de (mailing list archive)
State New, archived
Headers show
Series [1/5] nfs: simplify nfs4_parse_monolithic | expand

Commit Message

Christoph Hellwig Sept. 17, 2020, 8:22 a.m. UTC 
There are only two callers left, one of which is is in the alpha-specific
OSF/1 compat code.  Just open code it in both.

Signed-off-by: Christoph Hellwig <hch@lst.de>
---
 arch/alpha/kernel/osf_sys.c |  7 ++++++-
 fs/namespace.c              | 25 ++++++++-----------------
 include/linux/fs.h          |  2 --
 3 files changed, 14 insertions(+), 20 deletions(-)

Comments

Guenter Roeck Oct. 11, 2020, 2:17 p.m. UTC | #1 
On Thu, Sep 17, 2020 at 10:22:36AM +0200, Christoph Hellwig wrote:
> There are only two callers left, one of which is is in the alpha-specific
> OSF/1 compat code.  Just open code it in both.
> 
> Signed-off-by: Christoph Hellwig <hch@lst.de>
> ---
>  arch/alpha/kernel/osf_sys.c |  7 ++++++-
>  fs/namespace.c              | 25 ++++++++-----------------
>  include/linux/fs.h          |  2 --
>  3 files changed, 14 insertions(+), 20 deletions(-)
> 
> diff --git a/arch/alpha/kernel/osf_sys.c b/arch/alpha/kernel/osf_sys.c
> index 5fd155b13503b5..8acd5101097576 100644
> --- a/arch/alpha/kernel/osf_sys.c
> +++ b/arch/alpha/kernel/osf_sys.c
> @@ -434,6 +434,7 @@ SYSCALL_DEFINE4(osf_mount, unsigned long, typenr, const char __user *, path,
                                                                                             ^^^^
>  	struct osf_mount_args tmp;
>  	struct filename *devname;
>  	const char *fstype;
> +	struct path path;
        ^^^^^^^^^^^^^^^^

Someone didn't bother test building this patch.

arch/alpha/kernel/osf_sys.c: In function '__do_sys_osf_mount':
arch/alpha/kernel/osf_sys.c:437:14: error: 'path' redeclared as different kind of symbol

Guenter

>  	int retval;
>  
>  	if (copy_from_user(&tmp, args, sizeof(tmp)))
> @@ -467,7 +468,11 @@ SYSCALL_DEFINE4(osf_mount, unsigned long, typenr, const char __user *, path,
>  
>  	if (IS_ERR(devname))
>  		return PTR_ERR(devname);
> -	retval = do_mount(devname.name, dirname, fstype, flags, NULL);
> +	retval = user_path_at(AT_FDCWD, dirname, LOOKUP_FOLLOW, &path);
> +	if (!retval) {
> +		ret = path_mount(devname.name, &path, fstype, flags, NULL);
> +		path_put(&path);
> +	}
>  	putname(devname);
>  	return retval;
>  }
> diff --git a/fs/namespace.c b/fs/namespace.c
> index 12b431b61462b9..2ff373ebeaf27f 100644
> --- a/fs/namespace.c
> +++ b/fs/namespace.c
> @@ -3193,20 +3193,6 @@ int path_mount(const char *dev_name, struct path *path,
>  			    data_page);
>  }
>  
> -long do_mount(const char *dev_name, const char __user *dir_name,
> -		const char *type_page, unsigned long flags, void *data_page)
> -{
> -	struct path path;
> -	int ret;
> -
> -	ret = user_path_at(AT_FDCWD, dir_name, LOOKUP_FOLLOW, &path);
> -	if (ret)
> -		return ret;
> -	ret = path_mount(dev_name, &path, type_page, flags, data_page);
> -	path_put(&path);
> -	return ret;
> -}
> -
>  static struct ucounts *inc_mnt_namespaces(struct user_namespace *ns)
>  {
>  	return inc_ucount(ns, current_euid(), UCOUNT_MNT_NAMESPACES);
> @@ -3390,10 +3376,11 @@ EXPORT_SYMBOL(mount_subtree);
>  SYSCALL_DEFINE5(mount, char __user *, dev_name, char __user *, dir_name,
>  		char __user *, type, unsigned long, flags, void __user *, data)
>  {
> -	int ret;
> +	struct path path;
>  	char *kernel_type;
>  	char *kernel_dev;
>  	void *options;
> +	int ret;
>  
>  	kernel_type = copy_mount_string(type);
>  	ret = PTR_ERR(kernel_type);
> @@ -3410,8 +3397,12 @@ SYSCALL_DEFINE5(mount, char __user *, dev_name, char __user *, dir_name,
>  	if (IS_ERR(options))
>  		goto out_data;
>  
> -	ret = do_mount(kernel_dev, dir_name, kernel_type, flags, options);
> -
> +	ret = user_path_at(AT_FDCWD, dir_name, LOOKUP_FOLLOW, &path);
> +	if (ret)
> +		goto out_options;
> +	ret = path_mount(kernel_dev, &path, kernel_type, flags, options);
> +	path_put(&path);
> +out_options:
>  	kfree(options);
>  out_data:
>  	kfree(kernel_dev);
> diff --git a/include/linux/fs.h b/include/linux/fs.h
> index 7519ae003a082c..bd9878bdd4bfe9 100644
> --- a/include/linux/fs.h
> +++ b/include/linux/fs.h
> @@ -2292,8 +2292,6 @@ extern struct vfsmount *kern_mount(struct file_system_type *);
>  extern void kern_unmount(struct vfsmount *mnt);
>  extern int may_umount_tree(struct vfsmount *);
>  extern int may_umount(struct vfsmount *);
> -extern long do_mount(const char *, const char __user *,
> -		     const char *, unsigned long, void *);
>  extern struct vfsmount *collect_mounts(const struct path *);
>  extern void drop_collected_mounts(struct vfsmount *);
>  extern int iterate_mounts(int (*)(struct vfsmount *, void *), void *,
Al Viro Oct. 11, 2020, 6:01 p.m. UTC | #2 
On Sun, Oct 11, 2020 at 07:17:49AM -0700, Guenter Roeck wrote:

> Someone didn't bother test building this patch.
> 
> arch/alpha/kernel/osf_sys.c: In function '__do_sys_osf_mount':
> arch/alpha/kernel/osf_sys.c:437:14: error: 'path' redeclared as different kind of symbol

Quite.  Matter of fact, there's another problem (path_mount()
that needs to be moved from fs/internal.h for that) and IMO this
is simply not worth bothering with.  I don't see any benefits
in the last commit in there; the next-to-last one has some
point, and it's not hard to fix, but since it clearly got
no testing whatsoever...  Christoph, if you want it back,
resend it later, *after* having tested it.  qemu-system-alpha
works well enough to boot the last released debian/alpha. 

For now I'm dropping the last two commits from that branch.
diff mbox series

Patch

diff --git a/arch/alpha/kernel/osf_sys.c b/arch/alpha/kernel/osf_sys.c
index 5fd155b13503b5..8acd5101097576 100644
--- a/arch/alpha/kernel/osf_sys.c
+++ b/arch/alpha/kernel/osf_sys.c
@@ -434,6 +434,7 @@  SYSCALL_DEFINE4(osf_mount, unsigned long, typenr, const char __user *, path,
 	struct osf_mount_args tmp;
 	struct filename *devname;
 	const char *fstype;
+	struct path path;
 	int retval;
 
 	if (copy_from_user(&tmp, args, sizeof(tmp)))
@@ -467,7 +468,11 @@  SYSCALL_DEFINE4(osf_mount, unsigned long, typenr, const char __user *, path,
 
 	if (IS_ERR(devname))
 		return PTR_ERR(devname);
-	retval = do_mount(devname.name, dirname, fstype, flags, NULL);
+	retval = user_path_at(AT_FDCWD, dirname, LOOKUP_FOLLOW, &path);
+	if (!retval) {
+		ret = path_mount(devname.name, &path, fstype, flags, NULL);
+		path_put(&path);
+	}
 	putname(devname);
 	return retval;
 }
diff --git a/fs/namespace.c b/fs/namespace.c
index 12b431b61462b9..2ff373ebeaf27f 100644
--- a/fs/namespace.c
+++ b/fs/namespace.c
@@ -3193,20 +3193,6 @@  int path_mount(const char *dev_name, struct path *path,
 			    data_page);
 }
 
-long do_mount(const char *dev_name, const char __user *dir_name,
-		const char *type_page, unsigned long flags, void *data_page)
-{
-	struct path path;
-	int ret;
-
-	ret = user_path_at(AT_FDCWD, dir_name, LOOKUP_FOLLOW, &path);
-	if (ret)
-		return ret;
-	ret = path_mount(dev_name, &path, type_page, flags, data_page);
-	path_put(&path);
-	return ret;
-}
-
 static struct ucounts *inc_mnt_namespaces(struct user_namespace *ns)
 {
 	return inc_ucount(ns, current_euid(), UCOUNT_MNT_NAMESPACES);
@@ -3390,10 +3376,11 @@  EXPORT_SYMBOL(mount_subtree);
 SYSCALL_DEFINE5(mount, char __user *, dev_name, char __user *, dir_name,
 		char __user *, type, unsigned long, flags, void __user *, data)
 {
-	int ret;
+	struct path path;
 	char *kernel_type;
 	char *kernel_dev;
 	void *options;
+	int ret;
 
 	kernel_type = copy_mount_string(type);
 	ret = PTR_ERR(kernel_type);
@@ -3410,8 +3397,12 @@  SYSCALL_DEFINE5(mount, char __user *, dev_name, char __user *, dir_name,
 	if (IS_ERR(options))
 		goto out_data;
 
-	ret = do_mount(kernel_dev, dir_name, kernel_type, flags, options);
-
+	ret = user_path_at(AT_FDCWD, dir_name, LOOKUP_FOLLOW, &path);
+	if (ret)
+		goto out_options;
+	ret = path_mount(kernel_dev, &path, kernel_type, flags, options);
+	path_put(&path);
+out_options:
 	kfree(options);
 out_data:
 	kfree(kernel_dev);
diff --git a/include/linux/fs.h b/include/linux/fs.h
index 7519ae003a082c..bd9878bdd4bfe9 100644
--- a/include/linux/fs.h
+++ b/include/linux/fs.h
@@ -2292,8 +2292,6 @@  extern struct vfsmount *kern_mount(struct file_system_type *);
 extern void kern_unmount(struct vfsmount *mnt);
 extern int may_umount_tree(struct vfsmount *);
 extern int may_umount(struct vfsmount *);
-extern long do_mount(const char *, const char __user *,
-		     const char *, unsigned long, void *);
 extern struct vfsmount *collect_mounts(const struct path *);
 extern void drop_collected_mounts(struct vfsmount *);
 extern int iterate_mounts(int (*)(struct vfsmount *, void *), void *,