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OpenCloudOS-Kernel/fs/pnode.h

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[PATCH] beginning of the shared-subtree proper A private mount does not forward or receive propagation. This patch provides user the ability to convert any mount to private. Signed-off-by: Ram Pai <linuxram@us.ibm.com> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2005-11-08 06:19:07 +08:00
/*
* linux/fs/pnode.h
*
* (C) Copyright IBM Corporation 2005.
* Released under GPL v2.
*
*/
#ifndef _LINUX_PNODE_H
#define _LINUX_PNODE_H
#include <linux/list.h>
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>
2011-11-24 08:26:23 +08:00
#include "mount.h"
[PATCH] introduce shared mounts This creates shared mounts. A shared mount when bind-mounted to some mountpoint, propagates mount/umount events to each other. All the shared mounts that propagate events to each other belong to the same peer-group. Signed-off-by: Ram Pai <linuxram@us.ibm.com> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2005-11-08 06:19:33 +08:00
vfs: add missing parens in pnode.h macros Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2011-11-24 01:27:01 +08:00
#define IS_MNT_SHARED(mnt) ((mnt)->mnt_flags & MNT_SHARED)
#define IS_MNT_SLAVE(mnt) ((mnt)->mnt_master)
#define IS_MNT_NEW(mnt) (!(mnt)->mnt_ns)
#define CLEAR_MNT_SHARED(mnt) ((mnt)->mnt_flags &= ~MNT_SHARED)
#define IS_MNT_UNBINDABLE(mnt) ((mnt)->mnt_flags & MNT_UNBINDABLE)
[PATCH] introduce shared mounts This creates shared mounts. A shared mount when bind-mounted to some mountpoint, propagates mount/umount events to each other. All the shared mounts that propagate events to each other belong to the same peer-group. Signed-off-by: Ram Pai <linuxram@us.ibm.com> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2005-11-08 06:19:33 +08:00
[PATCH] shared mount handling: bind and rbind Implement handling of MS_BIND in presense of shared mounts (see Documentation/sharedsubtree.txt in the end of patch series for detailed description). Signed-off-by: Ram Pai <linuxram@us.ibm.com> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2005-11-08 06:19:50 +08:00
#define CL_EXPIRE 0x01
[PATCH] introduce slave mounts A slave mount always has a master mount from which it receives mount/umount events. Unlike shared mount the event propagation does not flow from the slave mount to the master. Signed-off-by: Ram Pai <linuxram@us.ibm.com> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2005-11-08 06:20:48 +08:00
#define CL_SLAVE 0x02
[PATCH] shared mount handling: bind and rbind Implement handling of MS_BIND in presense of shared mounts (see Documentation/sharedsubtree.txt in the end of patch series for detailed description). Signed-off-by: Ram Pai <linuxram@us.ibm.com> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2005-11-08 06:19:50 +08:00
#define CL_COPY_ALL 0x04
#define CL_MAKE_SHARED 0x08
Kill CL_PROPAGATION, sanitize fs/pnode.c:get_source() First of all, get_source() never results in CL_PROPAGATION alone. We either get CL_MAKE_SHARED (for the continuation of peer group) or CL_SLAVE (slave that is not shared) or both (beginning of peer group among slaves). Massage the code to make that explicit, kill CL_PROPAGATION test in clone_mnt() (nothing sets CL_MAKE_SHARED without CL_PROPAGATION and in clone_mnt() we are checking CL_PROPAGATION after we'd found that there's no CL_SLAVE, so the check for CL_MAKE_SHARED would do just as well). Fix comments, while we are at it... Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2010-01-17 02:28:47 +08:00
#define CL_PRIVATE 0x10
[PATCH] shared mount handling: bind and rbind Implement handling of MS_BIND in presense of shared mounts (see Documentation/sharedsubtree.txt in the end of patch series for detailed description). Signed-off-by: Ram Pai <linuxram@us.ibm.com> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2005-11-08 06:19:50 +08:00
vfs: spread struct mount - change_mnt_propagation/set_mnt_shared Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2011-11-25 09:43:10 +08:00
static inline void set_mnt_shared(struct mount *mnt)
[PATCH] shared mount handling: bind and rbind Implement handling of MS_BIND in presense of shared mounts (see Documentation/sharedsubtree.txt in the end of patch series for detailed description). Signed-off-by: Ram Pai <linuxram@us.ibm.com> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2005-11-08 06:19:50 +08:00
{
vfs: spread struct mount - change_mnt_propagation/set_mnt_shared Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2011-11-25 09:43:10 +08:00
mnt->mnt.mnt_flags &= ~MNT_SHARED_MASK;
mnt->mnt.mnt_flags |= MNT_SHARED;
[PATCH] shared mount handling: bind and rbind Implement handling of MS_BIND in presense of shared mounts (see Documentation/sharedsubtree.txt in the end of patch series for detailed description). Signed-off-by: Ram Pai <linuxram@us.ibm.com> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2005-11-08 06:19:50 +08:00
}
vfs: spread struct mount - change_mnt_propagation/set_mnt_shared Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2011-11-25 09:43:10 +08:00
void change_mnt_propagation(struct mount *, int);
[PATCH] shared mount handling: bind and rbind Implement handling of MS_BIND in presense of shared mounts (see Documentation/sharedsubtree.txt in the end of patch series for detailed description). Signed-off-by: Ram Pai <linuxram@us.ibm.com> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2005-11-08 06:19:50 +08:00
int propagate_mnt(struct vfsmount *, struct dentry *, struct vfsmount *,
struct list_head *);
[PATCH] shared mounts handling: umount An unmount of a mount creates a umount event on the parent. If the parent is a shared mount, it gets propagated to all mounts in the peer group. Signed-off-by: Ram Pai <linuxram@us.ibm.com> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2005-11-08 06:20:17 +08:00
int propagate_umount(struct list_head *);
vfs: spread struct mount - do_umount/propagate_mount_busy Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2011-11-25 10:35:16 +08:00
int propagate_mount_busy(struct mount *, int);
vfs: spread struct mount - mount group id handling Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2011-11-25 08:54:23 +08:00
void mnt_release_group_id(struct mount *);
[patch 7/7] vfs: mountinfo: show dominating group id Show peer group ID of nearest dominating group that has intersection with the mount's namespace. Signed-off-by: Miklos Szeredi <mszeredi@suse.cz> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2008-03-27 20:06:26 +08:00
int get_dominating_id(struct vfsmount *mnt, const struct path *root);
trim fs/internal.h some stuff in there can actually become static; some belongs to pnode.h as it's a private interface between namespace.c and pnode.c... Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2011-11-22 10:15:42 +08:00
unsigned int mnt_get_count(struct vfsmount *mnt);
void mnt_set_mountpoint(struct vfsmount *, struct dentry *,
vfs: spread struct mount mnt_set_mountpoint child argument Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2011-11-25 10:28:22 +08:00
struct mount *);
trim fs/internal.h some stuff in there can actually become static; some belongs to pnode.h as it's a private interface between namespace.c and pnode.c... Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2011-11-22 10:15:42 +08:00
void release_mounts(struct list_head *);
vfs: spread struct mount - umount_tree argument Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2011-11-25 10:07:43 +08:00
void umount_tree(struct mount *, int, struct list_head *);
vfs: spread struct mount - clone_mnt/copy_tree argument Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2011-11-25 10:24:27 +08:00
struct mount *copy_tree(struct mount *, struct dentry *, int);
vfs: more mnt_parent cleanups a) mount --move is checking that ->mnt_parent is non-NULL before looking if that parent happens to be shared; ->mnt_parent is never NULL and it's not even an misspelled !mnt_has_parent() b) pivot_root open-codes is_path_reachable(), poorly. c) so does path_is_under(), while we are at it. Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2011-11-24 08:34:49 +08:00
bool is_path_reachable(struct vfsmount *, struct dentry *,
const struct path *root);
[PATCH] beginning of the shared-subtree proper A private mount does not forward or receive propagation. This patch provides user the ability to convert any mount to private. Signed-off-by: Ram Pai <linuxram@us.ibm.com> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2005-11-08 06:19:07 +08:00
#endif /* _LINUX_PNODE_H */