(no subject)

Ram Pai
2005-07-25T22:59:35Z

, miklos@szeredi.hu, Janak Desai <janak@us.ibm.com>, linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: [PATCH 1/7] shared subtree
Content-Type: text/x-patch; name=shared_private_slave.patch
Content-Disposition: inline; filename=shared_private_slave.patch

This patch adds the shared/private/slave support for VFS trees.

Signed by Ram Pai (linuxram@us.ibm.com)

fs/Makefile | 2
fs/dcache.c | 2
fs/namespace.c | 93 ++++++++++
fs/pnode.c | 441 ++++++++++++++++++++++++++++++++++++++++++++++++++
include/linux/fs.h | 5
include/linux/mount.h | 44 ++++
include/linux/pnode.h | 90 ++++++++++
7 files changed, 673 insertions(+), 4 deletions(-)

Index: 2.6.12.work2/fs/namespace.c
===================================================================
--- 2.6.12.work2.orig/fs/namespace.c
+++ 2.6.12.work2/fs/namespace.c
@@ -22,6 +22,7 @@
#include <linux/namei.h>
#include <linux/security.h>
#include <linux/mount.h>
+#include <linux/pnode.h>
#include <asm/uaccess.h>
#include <asm/unistd.h>

@@ -62,6 +63,7 @@ struct vfsmount *alloc_vfsmnt(const char
INIT_LIST_HEAD(&mnt->mnt_mounts);
INIT_LIST_HEAD(&mnt->mnt_list);
INIT_LIST_HEAD(&mnt->mnt_fslink);
+ INIT_LIST_HEAD(&mnt->mnt_pnode_mntlist);
if (name) {
int size = strlen(name)+1;
char *newname = kmalloc(size, GFP_KERNEL);
@@ -615,6 +617,95 @@ out_unlock:
return err;
}

+static int do_make_shared(struct vfsmount *mnt)
+{
+ int err=0;
+ struct vfspnode *old_pnode = NULL;
+ /*
+ * if the mount is already a slave mount,
+ * allocate a new pnode and make it
+ * a slave pnode of the original pnode.
+ */
+ if (IS_MNT_SLAVE(mnt)) {
+ old_pnode = mnt->mnt_pnode;
+ pnode_del_slave_mnt(mnt);
+ }
+ if(!IS_MNT_SHARED(mnt)) {
+ mnt->mnt_pnode = pnode_alloc();
+ if(!mnt->mnt_pnode) {
+ pnode_add_slave_mnt(old_pnode, mnt);
+ err = -ENOMEM;
+ goto out;
+ }
+ pnode_add_member_mnt(mnt->mnt_pnode, mnt);
+ }
+ if(old_pnode)
+ pnode_add_slave_pnode(old_pnode, mnt->mnt_pnode);
+ set_mnt_shared(mnt);
+out:
+ return err;
+}
+
+static int do_make_slave(struct vfsmount *mnt)
+{
+ int err=0;
+
+ if (IS_MNT_SLAVE(mnt))
+ goto out;
+ /*
+ * only shared mounts can
+ * be made slave
+ */
+ if (!IS_MNT_SHARED(mnt)) {
+ err = -EINVAL;
+ goto out;
+ }
+ pnode_member_to_slave(mnt);
+out:
+ return err;
+}
+
+static int do_make_private(struct vfsmount *mnt)
+{
+ if(mnt->mnt_pnode)
+ pnode_disassociate_mnt(mnt);
+ set_mnt_private(mnt);
+ return 0;
+}
+
+/*
+ * recursively change the type of the mountpoint.
+ */
+static int do_change_type(struct nameidata *nd, int flag)
+{
+ struct vfsmount *m, *mnt = nd->mnt;
+ int err=0;
+
+ if (!(flag & MS_SHARED) && !(flag & MS_PRIVATE)
+ && !(flag & MS_SLAVE))
+ return -EINVAL;
+
+ if (nd->dentry != nd->mnt->mnt_root)
+ return -EINVAL;
+
+ spin_lock(&vfsmount_lock);
+ for (m = mnt; m; m = next_mnt(m, mnt)) {
+ switch (flag) {
+ case MS_SHARED:
+ err = do_make_shared(m);
+ break;
+ case MS_SLAVE:
+ err = do_make_slave(m);
+ break;
+ case MS_PRIVATE:
+ err = do_make_private(m);
+ break;
+ }
+ }
+ spin_unlock(&vfsmount_lock);
+ return err;
+}
+
/*
* do loopback mount.
*/
@@ -1049,6 +1140,8 @@ long do_mount(char * dev_name, char * di
data_page);
else if (flags & MS_BIND)
retval = do_loopback(&nd, dev_name, flags & MS_REC);
+ else if (flags & MS_SHARED || flags & MS_PRIVATE || flags & MS_SLAVE)
+ retval = do_change_type(&nd, flags);
else if (flags & MS_MOVE)
retval = do_move_mount(&nd, dev_name);
else
Index: 2.6.12.work2/fs/pnode.c
===================================================================
--- /dev/null
+++ 2.6.12.work2/fs/pnode.c
@@ -0,0 +1,441 @@
+/*
+ * linux/fs/pnode.c
+ *
+ * (C) Copyright IBM Corporation 2005.
+ * Released under GPL v2.
+ * Author : Ram Pai (linuxram@us.ibm.com)
+ *
+ */
+
+#include <linux/config.h>
+#include <linux/syscalls.h>
+#include <linux/slab.h>
+#include <linux/sched.h>
+#include <linux/smp_lock.h>
+#include <linux/init.h>
+#include <linux/quotaops.h>
+#include <linux/acct.h>
+#include <linux/module.h>
+#include <linux/seq_file.h>
+#include <linux/namespace.h>
+#include <linux/namei.h>
+#include <linux/security.h>
+#include <linux/mount.h>
+#include <linux/pnode.h>
+#include <asm/uaccess.h>
+#include <asm/unistd.h>
+#include <stdarg.h>
+
+
+static kmem_cache_t * pnode_cachep;
+
+/* spinlock for pnode related operations */
+ __cacheline_aligned_in_smp DEFINE_SPINLOCK(vfspnode_lock);
+
+enum pnode_vfs_type {
+ PNODE_MEMBER_VFS = 0x01,
+ PNODE_SLAVE_VFS = 0x02
+};
+
+void __init pnode_init(unsigned long mempages)
+{
+ pnode_cachep = kmem_cache_create("pnode_cache",
+ sizeof(struct vfspnode), 0,
+ SLAB_HWCACHE_ALIGN|SLAB_PANIC, NULL, NULL);
+}
+
+struct vfspnode * pnode_alloc(void)
+{
+ struct vfspnode *pnode = kmem_cache_alloc(pnode_cachep, GFP_KERNEL);
+ INIT_LIST_HEAD(&pnode->pnode_vfs);
+ INIT_LIST_HEAD(&pnode->pnode_slavevfs);
+ INIT_LIST_HEAD(&pnode->pnode_slavepnode);
+ INIT_LIST_HEAD(&pnode->pnode_peer_slave);
+ pnode->pnode_master = NULL;
+ pnode->pnode_flags = 0;
+ atomic_set(&pnode->pnode_count,0);
+ return pnode;
+}
+
+void inline pnode_free(struct vfspnode *pnode)
+{
+ kmem_cache_free(pnode_cachep, pnode);
+}
+
+/*
+ * __put_pnode() should be called with vfspnode_lock held
+ */
+void __put_pnode(struct vfspnode *pnode)
+{
+ struct vfspnode *tmp_pnode;
+ do {
+ tmp_pnode = pnode->pnode_master;
+ list_del_init(&pnode->pnode_peer_slave);
+ BUG_ON(!list_empty(&pnode->pnode_vfs));
+ BUG_ON(!list_empty(&pnode->pnode_slavevfs));
+ BUG_ON(!list_empty(&pnode->pnode_slavepnode));
+ pnode_free(pnode);
+ pnode = tmp_pnode;
+ if (!pnode || !atomic_dec_and_test(&pnode->pnode_count))
+ break;
+ } while(pnode);
+}
+
+static void inline pnode_add_mnt(struct vfspnode *pnode,
+ struct vfsmount *mnt, int slave)
+{
+ if (!pnode || !mnt)
+ return;
+ spin_lock(&vfspnode_lock);
+ mnt->mnt_pnode = pnode;
+ if (slave) {
+ set_mnt_slave(mnt);
+ list_add(&mnt->mnt_pnode_mntlist, &pnode->pnode_slavevfs);
+ } else {
+ set_mnt_shared(mnt);
+ list_add(&mnt->mnt_pnode_mntlist, &pnode->pnode_vfs);
+ }
+ get_pnode(pnode);
+ spin_unlock(&vfspnode_lock);
+}
+
+void pnode_add_member_mnt(struct vfspnode *pnode,
+ struct vfsmount *mnt)
+{
+ pnode_add_mnt(pnode, mnt, 0);
+}
+
+void pnode_add_slave_mnt(struct vfspnode *pnode,
+ struct vfsmount *mnt)
+{
+ pnode_add_mnt(pnode, mnt, 1);
+}
+
+
+void pnode_add_slave_pnode(struct vfspnode *pnode,
+ struct vfspnode *slave_pnode)
+{
+ if (!pnode || !slave_pnode)
+ return;
+ spin_lock(&vfspnode_lock);
+ slave_pnode->pnode_master = pnode;
+ slave_pnode->pnode_flags = 0;
+ list_add(&slave_pnode->pnode_peer_slave, &pnode->pnode_slavepnode);
+ get_pnode(pnode);
+ spin_unlock(&vfspnode_lock);
+}
+
+/*
+ * merge 'pnode' into 'peer_pnode' and get rid of pnode
+ * @pnode: pnode the contents of which have to be merged
+ * @peer_pnode: pnode into which the contents are merged
+ */
+int pnode_merge_pnode(struct vfspnode *pnode, struct vfspnode *peer_pnode)
+{
+ struct vfspnode *slave_pnode, *pnext;
+ struct vfsmount *mnt, *slave_mnt, *next;
+
+ list_for_each_entry_safe(slave_pnode, pnext,
+ &pnode->pnode_slavepnode, pnode_peer_slave) {
+ slave_pnode->pnode_master = peer_pnode;
+ list_move(&slave_pnode->pnode_peer_slave,
+ &peer_pnode->pnode_slavepnode);
+ put_pnode_locked(pnode);
+ get_pnode(peer_pnode);
+ }
+
+ list_for_each_entry_safe(slave_mnt, next,
+ &pnode->pnode_slavevfs, mnt_pnode_mntlist) {
+ slave_mnt->mnt_pnode = peer_pnode;
+ list_move(&slave_mnt->mnt_pnode_mntlist,
+ &peer_pnode->pnode_slavevfs);
+ put_pnode_locked(pnode);
+ get_pnode(peer_pnode);
+ }
+
+ list_for_each_entry_safe(mnt, next,
+ &pnode->pnode_vfs, mnt_pnode_mntlist) {
+ mnt->mnt_pnode = peer_pnode;
+ list_move(&mnt->mnt_pnode_mntlist,
+ &peer_pnode->pnode_vfs);
+ put_pnode_locked(pnode);
+ get_pnode(peer_pnode);
+ }
+ return 0;
+}
+
+/*
+ * called when pnode has no member mounts. Merge all the slave mounts/pnodes
+ * of this pnode with that of its master pnode. If master pnode does not exit,
+ * convert all the slave mounts to private mounts.
+ */
+static void empty_pnode(struct vfspnode *pnode) { struct vfsmount *slave_mnt,
+ *next; struct vfspnode *master_pnode, *slave_pnode, *pnext;
+
+ if ((master_pnode = pnode->pnode_master)) {
+ pnode->pnode_master = NULL;
+ list_del_init(&pnode->pnode_peer_slave);
+ pnode_merge_pnode(pnode, master_pnode);
+ put_pnode_locked(master_pnode);
+ } else {
+ list_for_each_entry_safe(slave_mnt, next,
+ &pnode->pnode_slavevfs, mnt_pnode_mntlist) {
+ list_del_init(&slave_mnt->mnt_pnode_mntlist);
+ set_mnt_private(slave_mnt);
+ put_pnode_locked(pnode);
+ }
+ list_for_each_entry_safe(slave_pnode, pnext,
+ &pnode->pnode_slavepnode, pnode_peer_slave) {
+ slave_pnode->pnode_master = NULL;
+ list_del_init(&slave_pnode->pnode_peer_slave);
+ put_pnode_locked(pnode);
+ }
+ }
+}
+
+static void __pnode_disassociate_mnt(struct vfsmount *mnt)
+{
+ struct vfspnode *pnode = mnt->mnt_pnode;
+
+ spin_lock(&vfspnode_lock);
+ list_del_init(&mnt->mnt_pnode_mntlist);
+
+ if (list_empty(&pnode->pnode_vfs))
+ empty_pnode(pnode);
+
+ put_pnode_locked(pnode);
+
+ spin_unlock(&vfspnode_lock);
+ mnt->mnt_pnode = NULL;
+}
+
+void pnode_del_slave_mnt(struct vfsmount *mnt)
+{
+ if (!mnt || !mnt->mnt_pnode)
+ return;
+ __pnode_disassociate_mnt(mnt);
+ CLEAR_MNT_SLAVE(mnt);
+}
+
+void pnode_del_member_mnt(struct vfsmount *mnt)
+{
+ if (!mnt || !mnt->mnt_pnode)
+ return;
+ __pnode_disassociate_mnt(mnt);
+ CLEAR_MNT_SHARED(mnt);
+}
+
+void pnode_member_to_slave(struct vfsmount *mnt)
+{
+ struct vfspnode *pnode = mnt->mnt_pnode;
+ if (!mnt || !pnode)
+ return;
+
+ spin_lock(&vfspnode_lock);
+
+ list_del_init(&mnt->mnt_pnode_mntlist);
+ list_add(&mnt->mnt_pnode_mntlist, &pnode->pnode_slavevfs);
+ set_mnt_slave(mnt);
+
+ if (list_empty(&pnode->pnode_vfs))
+ empty_pnode(pnode);
+
+ spin_unlock(&vfspnode_lock);
+ return;
+}
+
+void pnode_disassociate_mnt(struct vfsmount *mnt)
+{
+ if (!mnt || !mnt->mnt_pnode)
+ return;
+ __pnode_disassociate_mnt(mnt);
+ CLEAR_MNT_SHARED(mnt);
+ CLEAR_MNT_SLAVE(mnt);
+}
+
+struct pcontext {
+ struct vfspnode *start;
+ int level;
+ struct vfspnode *master_pnode;
+ struct vfspnode *pnode;
+};
+
+/*
+ * Walk the pnode tree for each pnode encountered.
+ * @context: provides context on the state of the last walk in the pnode
+ * tree.
+ */
+static int pnode_next(struct pcontext *context)
+{
+ struct vfspnode *pnode = context->pnode;
+ struct vfspnode *master_pnode=context->master_pnode;
+ struct list_head *next;
+
+ if (!pnode) {
+ BUG_ON(!context->start);
+ get_pnode(context->start);
+ context->pnode = context->start;
+ context->master_pnode = NULL;
+ context->level = 0;
+ return 1;
+ }
+
+ spin_lock(&vfspnode_lock);
+ next = pnode->pnode_slavepnode.next;
+ if (next == &pnode->pnode_slavepnode) {
+ while (1) {
+ int flag;
+
+ if (pnode == context->start) {
+ put_pnode_locked(pnode);
+ spin_unlock(&vfspnode_lock);
+ BUG_ON(context->level != 0);
+ return 0;
+ }
+
+ next = pnode->pnode_peer_slave.next;
+ flag = (next != &pnode->pnode_master->pnode_slavepnode);
+ put_pnode_locked(pnode);
+
+ if (flag)
+ break;
+
+ pnode = master_pnode;
+ master_pnode = pnode->pnode_master;
+ context->level--;
+ }
+ } else {
+ master_pnode = pnode;
+ context->level++;
+ }
+
+ pnode = list_entry(next, struct vfspnode, pnode_peer_slave);
+ get_pnode(pnode);
+
+ context->pnode = pnode;
+ context->master_pnode = master_pnode;
+ spin_unlock(&vfspnode_lock);
+ return 1;
+}
+
+/*
+ * skip the rest of the tree, cleaning up
+ * reference to pnodes held in pnode_next().
+ */
+static void pnode_end(struct pcontext *context)
+{
+ struct vfspnode *p = context->pnode;
+ struct vfspnode *start = context->start;
+
+ do {
+ put_pnode(p);
+ } while (p != start && (p = p->pnode_master));
+ return;
+}
+
+/*
+ * traverse the pnode tree and at each pnode encountered, execute the
+ * pnode_fnc(). For each vfsmount encountered call the vfs_fnc().
+ *
+ * @pnode: pnode tree to be traversed
+ * @in_data: input data
+ * @out_data: output data
+ * @pnode_func: function to be called when a new pnode is encountered.
+ * @vfs_func: function to be called on each slave and member vfs belonging
+ * to the pnode.
+ */
+static int pnode_traverse(struct vfspnode *pnode,
+ void *in_data,
+ void **out_data,
+ int (*pnode_pre_func)(struct vfspnode *,
+ void *, void **, va_list),
+ int (*pnode_post_func)(struct vfspnode *,
+ void *, va_list),
+ int (*vfs_func)(struct vfsmount *,
+ enum pnode_vfs_type, void *, va_list),
+ ...)
+{
+ va_list args;
+ int ret = 0, level;
+ void *my_data, *data_from_master;
+ struct vfspnode *master_pnode;
+ struct vfsmount *slave_mnt, *member_mnt, *t_m;
+ struct pcontext context;
+ static void *p_array[PNODE_MAX_SLAVE_LEVEL];
+
+ context.start = pnode;
+ context.pnode = NULL;
+ /*
+ * determine whether to process vfs first or the
+ * slave pnode first
+ */
+ while (pnode_next(&context)) {
+ level = context.level;
+
+ if (level >= PNODE_MAX_SLAVE_LEVEL)
+ goto error;
+
+ pnode = context.pnode;
+ master_pnode = context.master_pnode;
+
+ if (master_pnode) {
+ data_from_master = p_array[level-1];
+ my_data = NULL;
+ } else {
+ data_from_master = NULL;
+ my_data = in_data;
+ }
+
+ if (pnode_pre_func) {
+ va_start(args, vfs_func);
+ if((ret = pnode_pre_func(pnode,
+ data_from_master, &my_data, args)))
+ goto error;
+ va_end(args);
+ }
+
+ // traverse member vfsmounts
+ spin_lock(&vfspnode_lock);
+ list_for_each_entry_safe(member_mnt,
+ t_m, &pnode->pnode_vfs, mnt_pnode_mntlist) {
+
+ spin_unlock(&vfspnode_lock);
+ va_start(args, vfs_func);
+ if ((ret = vfs_func(member_mnt,
+ PNODE_MEMBER_VFS, my_data, args)))
+ goto error;
+ va_end(args);
+ spin_lock(&vfspnode_lock);
+ }
+ list_for_each_entry_safe(slave_mnt, t_m,
+ &pnode->pnode_slavevfs, mnt_pnode_mntlist) {
+
+ spin_unlock(&vfspnode_lock);
+ va_start(args, vfs_func);
+ if ((ret = vfs_func(slave_mnt, PNODE_SLAVE_VFS,
+ my_data, args)))
+ goto error;
+ va_end(args);
+ spin_lock(&vfspnode_lock);
+ }
+ spin_unlock(&vfspnode_lock);
+
+ if (pnode_post_func) {
+ va_start(args, vfs_func);
+ if((ret = pnode_post_func(pnode,
+ my_data, args)))
+ goto error;
+ va_end(args);
+ }
+
+ p_array[level] = my_data;
+ }
+out:
+ if (out_data)
+ *out_data = p_array[0];
+ return ret;
+error:
+ va_end(args);
+ pnode_end(&context);
+ goto out;
+}
Index: 2.6.12.work2/fs/dcache.c
===================================================================
--- 2.6.12.work2.orig/fs/dcache.c
+++ 2.6.12.work2/fs/dcache.c
@@ -27,6 +27,7 @@
#include <linux/module.h>
#include <linux/mount.h>
#include <linux/file.h>
+#include <linux/pnode.h>
#include <asm/uaccess.h>
#include <linux/security.h>
#include <linux/seqlock.h>
@@ -1737,6 +1738,7 @@ void __init vfs_caches_init(unsigned lon
inode_init(mempages);
files_init(mempages);
mnt_init(mempages);
+ pnode_init(mempages);
bdev_cache_init();
chrdev_init();
}
Index: 2.6.12.work2/include/linux/fs.h
===================================================================
--- 2.6.12.work2.orig/include/linux/fs.h
+++ 2.6.12.work2/include/linux/fs.h
@@ -102,6 +102,9 @@ extern int dir_notify_enable;
#define MS_MOVE 8192
#define MS_REC 16384
#define MS_VERBOSE 32768
+#define MS_PRIVATE (1<<18) /* recursively change to private */
+#define MS_SLAVE (1<<19) /* recursively change to slave */
+#define MS_SHARED (1<<20) /* recursively change to shared */
#define MS_POSIXACL (1<<16) /* VFS does not apply the umask */
#define MS_ACTIVE (1<<30)
#define MS_NOUSER (1<<31)
@@ -232,6 +235,7 @@ extern void update_atime (struct inode *
extern void __init inode_init(unsigned long);
extern void __init inode_init_early(void);
extern void __init mnt_init(unsigned long);
+extern void __init pnode_init(unsigned long);
extern void __init files_init(unsigned long);

struct buffer_head;
@@ -1211,6 +1215,7 @@ extern struct vfsmount *kern_mount(struc
extern int may_umount_tree(struct vfsmount *);
extern int may_umount(struct vfsmount *);
extern long do_mount(char *, char *, char *, unsigned long, void *);
+extern struct vfsmount *do_make_mounted(struct vfsmount *, struct dentry *);

extern int vfs_statfs(struct super_block *, struct kstatfs *);

Index: 2.6.12.work2/include/linux/pnode.h
===================================================================
--- /dev/null
+++ 2.6.12.work2/include/linux/pnode.h
@@ -0,0 +1,90 @@
+/*
+ * linux/fs/pnode.c
+ *
+ * (C) Copyright IBM Corporation 2005.
+ * Released under GPL v2.
+ *
+ */
+#ifndef _LINUX_PNODE_H
+#define _LINUX_PNODE_H
+
+#include <linux/list.h>
+#include <linux/mount.h>
+#include <linux/spinlock.h>
+#include <asm/atomic.h>
+
+struct vfspnode {
+ struct list_head pnode_vfs; /* list of vfsmounts anchored here */
+ struct list_head pnode_slavevfs; /* list of slave vfsmounts */
+ struct list_head pnode_slavepnode;/* list of slave pnode */
+ struct list_head pnode_peer_slave;/* going through master's slave pnode
+ list*/
+ struct vfspnode *pnode_master; /* master pnode */
+ int pnode_flags;
+ atomic_t pnode_count;
+};
+#define PNODE_MAX_SLAVE_LEVEL 32 /* MAXIMUM DEPTH OF THE PNODE TREE */
+#define PNODE_DELETE 0x01
+#define PNODE_SLAVE 0x02
+
+#define IS_PNODE_DELETE(pn) ((pn->pnode_flags&PNODE_DELETE)==PNODE_DELETE)
+#define IS_PNODE_SLAVE(pn) ((pn->pnode_flags&PNODE_SLAVE)==PNODE_SLAVE)
+#define SET_PNODE_DELETE(pn) pn->pnode_flags |= PNODE_DELETE
+#define SET_PNODE_SLAVE(pn) pn->pnode_flags |= PNODE_SLAVE
+
+extern spinlock_t vfspnode_lock;
+extern void __put_pnode(struct vfspnode *);
+
+static inline struct vfspnode *
+get_pnode(struct vfspnode *pnode)
+{
+ if (!pnode)
+ return NULL;
+ atomic_inc(&pnode->pnode_count);
+ return pnode;
+}
+
+static inline void
+put_pnode(struct vfspnode *pnode)
+{
+ if (!pnode)
+ return;
+ if (atomic_dec_and_lock(&pnode->pnode_count, &vfspnode_lock)) {
+ __put_pnode(pnode);
+ spin_unlock(&vfspnode_lock);
+ }
+}
+
+/*
+ * must be called holding the vfspnode_lock
+ */
+static inline void
+put_pnode_locked(struct vfspnode *pnode)
+{
+ if (!pnode)
+ return;
+ if (atomic_dec_and_test(&pnode->pnode_count)) {
+ __put_pnode(pnode);
+ }
+}
+
+void __init pnode_init(unsigned long );
+struct vfspnode * pnode_alloc(void);
+void pnode_add_slave_mnt(struct vfspnode *, struct vfsmount *);
+void pnode_add_member_mnt(struct vfspnode *, struct vfsmount *);
+void pnode_del_slave_mnt(struct vfsmount *);
+void pnode_del_member_mnt(struct vfsmount *);
+void pnode_disassociate_mnt(struct vfsmount *);
+void pnode_add_slave_pnode(struct vfspnode *, struct vfspnode *);
+struct vfsmount * pnode_make_mounted(struct vfspnode *, struct vfsmount *,
+ struct dentry *);
+void pnode_member_to_slave(struct vfsmount *);
+int pnode_merge_pnode(struct vfspnode *, struct vfspnode *);
+struct vfsmount * pnode_make_mounted(struct vfspnode *, struct vfsmount *,
+ struct dentry *);
+int pnode_make_unmounted(struct vfspnode *);
+int pnode_prepare_mount(struct vfspnode *, struct vfspnode *, struct dentry *,
+ struct vfsmount *, struct vfsmount *);
+int pnode_commit_mount(struct vfspnode *, int);
+int pnode_abort_mount(struct vfspnode *, struct vfsmount *);
+#endif /* _LINUX_PNODE_H */
Index: 2.6.12.work2/include/linux/mount.h
===================================================================
--- 2.6.12.work2.orig/include/linux/mount.h
+++ 2.6.12.work2/include/linux/mount.h
@@ -16,9 +16,21 @@
#include <linux/spinlock.h>
#include <asm/atomic.h>

-#define MNT_NOSUID 1
-#define MNT_NODEV 2
-#define MNT_NOEXEC 4
+#define MNT_NOSUID 0x01
+#define MNT_NODEV 0x02
+#define MNT_NOEXEC 0x04
+#define MNT_PRIVATE 0x10 /* if the vfsmount is private, by default it is private*/
+#define MNT_SLAVE 0x20 /* if the vfsmount is a slave mount of its pnode */
+#define MNT_SHARED 0x40 /* if the vfsmount is a slave mount of its pnode */
+#define MNT_PNODE_MASK 0xf0 /* propogation flag mask */
+
+#define IS_MNT_SHARED(mnt) (mnt->mnt_flags & MNT_SHARED)
+#define IS_MNT_SLAVE(mnt) (mnt->mnt_flags & MNT_SLAVE)
+#define IS_MNT_PRIVATE(mnt) (mnt->mnt_flags & MNT_PRIVATE)
+
+#define CLEAR_MNT_SHARED(mnt) (mnt->mnt_flags &= ~(MNT_PNODE_MASK & MNT_SHARED))
+#define CLEAR_MNT_PRIVATE(mnt) (mnt->mnt_flags &= ~(MNT_PNODE_MASK & MNT_PRIVATE))
+#define CLEAR_MNT_SLAVE(mnt) (mnt->mnt_flags &= ~(MNT_PNODE_MASK & MNT_SLAVE))

struct vfsmount
{
@@ -29,6 +41,10 @@ struct vfsmount
struct super_block *mnt_sb; /* pointer to superblock */
struct list_head mnt_mounts; /* list of children, anchored here */
struct list_head mnt_child; /* and going through their mnt_child */
+ struct list_head mnt_pnode_mntlist;/* and going through their
+ pnode's vfsmount */
+ struct vfspnode *mnt_pnode; /* and going through their
+ pnode's vfsmount */
atomic_t mnt_count;
int mnt_flags;
int mnt_expiry_mark; /* true if marked for expiry */
@@ -38,6 +54,28 @@ struct vfsmount
struct namespace *mnt_namespace; /* containing namespace */
};

+static inline void set_mnt_shared(struct vfsmount *mnt)
+{
+ mnt->mnt_flags |= MNT_PNODE_MASK & MNT_SHARED;
+ CLEAR_MNT_PRIVATE(mnt);
+ CLEAR_MNT_SLAVE(mnt);
+}
+
+static inline void set_mnt_private(struct vfsmount *mnt)
+{
+ mnt->mnt_flags |= MNT_PNODE_MASK & MNT_PRIVATE;
+ CLEAR_MNT_SLAVE(mnt);
+ CLEAR_MNT_SHARED(mnt);
+ mnt->mnt_pnode = NULL;
+}
+
+static inline void set_mnt_slave(struct vfsmount *mnt)
+{
+ mnt->mnt_flags |= MNT_PNODE_MASK & MNT_SLAVE;
+ CLEAR_MNT_PRIVATE(mnt);
+ CLEAR_MNT_SHARED(mnt);
+}
+
static inline struct vfsmount *mntget(struct vfsmount *mnt)
{
if (mnt)
Index: 2.6.12.work2/fs/Makefile
===================================================================
--- 2.6.12.work2.orig/fs/Makefile
+++ 2.6.12.work2/fs/Makefile
@@ -8,7 +8,7 @@
obj-y := open.o read_write.o file_table.o buffer.o bio.o super.o \
block_dev.o char_dev.o stat.o exec.o pipe.o namei.o fcntl.o \
ioctl.o readdir.o select.o fifo.o locks.o dcache.o inode.o \
- attr.o bad_inode.o file.o filesystems.o namespace.o aio.o \
+ attr.o bad_inode.o file.o filesystems.o namespace.o pnode.o aio.o \
seq_file.o xattr.o libfs.o fs-writeback.o mpage.o direct-io.o \

obj-$(CONFIG_EPOLL) += eventpoll.o