alistair23-linux/fs/mount.h

#include <linux/mount.h>

struct mount {
	struct vfsmount mnt;
};

static inline struct mount *real_mount(struct vfsmount *mnt)
{
	return container_of(mnt, struct mount, mnt);
}

static inline int mnt_has_parent(struct vfsmount *mnt)
{
	return mnt != mnt->mnt_parent;
}
vfs: new internal helper: mnt_has_parent(mnt) vfsmounts have ->mnt_parent pointing either to a different vfsmount or to itself; it's never NULL and termination condition in loops traversing the tree towards root is mnt == mnt->mnt_parent. At least one place (see the next patch) is confused about what's going on; let's add an explicit helper checking it right way and use it in all places where we need it. Not that there had been too many, but... Signed-off-by: Al Viro <viro@zeniv.linux.org.uk> 2011-11-23 17:26:23 -07:00			`#include <linux/mount.h>`

vfs: start hiding vfsmount guts series Almost all fields of struct vfsmount are used only by core VFS (and a fairly small part of it, at that). The plan: embed struct vfsmount into struct mount, making the latter visible only to core parts of VFS. Then move fields from vfsmount to mount, eventually leaving only mnt_root/mnt_sb/mnt_flags in struct vfsmount. Filesystem code still gets pointers to struct vfsmount and remains unchanged; all such pointers go to struct vfsmount embedded into the instances of struct mount allocated by fs/namespace.c. When fs/namespace.c et.al. get a pointer to vfsmount, they turn it into pointer to mount (using container_of) and work with that. This is the first part of series; struct mount is introduced, allocation switched to using it. Signed-off-by: Al Viro <viro@zeniv.linux.org.uk> 2011-11-23 10:14:10 -07:00			`struct mount {`
			`struct vfsmount mnt;`
			`};`

			`static inline struct mount real_mount(struct vfsmount mnt)`
			`{`
			`return container_of(mnt, struct mount, mnt);`
			`}`

vfs: new internal helper: mnt_has_parent(mnt) vfsmounts have ->mnt_parent pointing either to a different vfsmount or to itself; it's never NULL and termination condition in loops traversing the tree towards root is mnt == mnt->mnt_parent. At least one place (see the next patch) is confused about what's going on; let's add an explicit helper checking it right way and use it in all places where we need it. Not that there had been too many, but... Signed-off-by: Al Viro <viro@zeniv.linux.org.uk> 2011-11-23 17:26:23 -07:00			`static inline int mnt_has_parent(struct vfsmount *mnt)`
			`{`
			`return mnt != mnt->mnt_parent;`
			`}`