1 files changed, 229 insertions, 0 deletions
diff --git a/fs/nfs/namespace.c b/fs/nfs/namespace.c
new file mode 100644
index 00000000000..19b98ca468e
--- /dev/null
+++ b/fs/nfs/namespace.c
@@ -0,0 +1,229 @@
+/*
+ * linux/fs/nfs/namespace.c
+ *
+ * Copyright (C) 2005 Trond Myklebust <Trond.Myklebust@netapp.com>
+ *
+ * NFS namespace
+ */
+
+#include <linux/config.h>
+
+#include <linux/dcache.h>
+#include <linux/mount.h>
+#include <linux/namei.h>
+#include <linux/nfs_fs.h>
+#include <linux/string.h>
+#include <linux/sunrpc/clnt.h>
+#include <linux/vfs.h>
+#include "internal.h"
+
+#define NFSDBG_FACILITY		NFSDBG_VFS
+
+static void nfs_expire_automounts(void *list);
+
+LIST_HEAD(nfs_automount_list);
+static DECLARE_WORK(nfs_automount_task, nfs_expire_automounts, &nfs_automount_list);
+int nfs_mountpoint_expiry_timeout = 500 * HZ;
+
+/*
+ * nfs_path - reconstruct the path given an arbitrary dentry
+ * @base - arbitrary string to prepend to the path
+ * @dentry - pointer to dentry
+ * @buffer - result buffer
+ * @buflen - length of buffer
+ *
+ * Helper function for constructing the path from the
+ * root dentry to an arbitrary hashed dentry.
+ *
+ * This is mainly for use in figuring out the path on the
+ * server side when automounting on top of an existing partition.
+ */
+char *nfs_path(const char *base, const struct dentry *dentry,
+	       char *buffer, ssize_t buflen)
+{
+	char *end = buffer+buflen;
+	int namelen;
+
+	*--end = '\0';
+	buflen--;
+	spin_lock(&dcache_lock);
+	while (!IS_ROOT(dentry)) {
+		namelen = dentry->d_name.len;
+		buflen -= namelen + 1;
+		if (buflen < 0)
+			goto Elong;
+		end -= namelen;
+		memcpy(end, dentry->d_name.name, namelen);
+		*--end = '/';
+		dentry = dentry->d_parent;
+	}
+	spin_unlock(&dcache_lock);
+	namelen = strlen(base);
+	/* Strip off excess slashes in base string */
+	while (namelen > 0 && base[namelen - 1] == '/')
+		namelen--;
+	buflen -= namelen;
+	if (buflen < 0)
+		goto Elong;
+	end -= namelen;
+	memcpy(end, base, namelen);
+	return end;
+Elong:
+	return ERR_PTR(-ENAMETOOLONG);
+}
+
+/*
+ * nfs_follow_mountpoint - handle crossing a mountpoint on the server
+ * @dentry - dentry of mountpoint
+ * @nd - nameidata info
+ *
+ * When we encounter a mountpoint on the server, we want to set up
+ * a mountpoint on the client too, to prevent inode numbers from
+ * colliding, and to allow "df" to work properly.
+ * On NFSv4, we also want to allow for the fact that different
+ * filesystems may be migrated to different servers in a failover
+ * situation, and that different filesystems may want to use
+ * different security flavours.
+ */
+static void * nfs_follow_mountpoint(struct dentry *dentry, struct nameidata *nd)
+{
+	struct vfsmount *mnt;
+	struct nfs_server *server = NFS_SERVER(dentry->d_inode);
+	struct dentry *parent;
+	struct nfs_fh fh;
+	struct nfs_fattr fattr;
+	int err;
+
+	BUG_ON(IS_ROOT(dentry));
+	dprintk("%s: enter\n", __FUNCTION__);
+	dput(nd->dentry);
+	nd->dentry = dget(dentry);
+	if (d_mountpoint(nd->dentry))
+		goto out_follow;
+	/* Look it up again */
+	parent = dget_parent(nd->dentry);
+	err = server->rpc_ops->lookup(parent->d_inode, &nd->dentry->d_name, &fh, &fattr);
+	dput(parent);
+	if (err != 0)
+		goto out_err;
+
+	if (fattr.valid & NFS_ATTR_FATTR_V4_REFERRAL)
+		mnt = nfs_do_refmount(nd->mnt, nd->dentry);
+	else
+		mnt = nfs_do_submount(nd->mnt, nd->dentry, &fh, &fattr);
+	err = PTR_ERR(mnt);
+	if (IS_ERR(mnt))
+		goto out_err;
+
+	mntget(mnt);
+	err = do_add_mount(mnt, nd, nd->mnt->mnt_flags|MNT_SHRINKABLE, &nfs_automount_list);
+	if (err < 0) {
+		mntput(mnt);
+		if (err == -EBUSY)
+			goto out_follow;
+		goto out_err;
+	}
+	mntput(nd->mnt);
+	dput(nd->dentry);
+	nd->mnt = mnt;
+	nd->dentry = dget(mnt->mnt_root);
+	schedule_delayed_work(&nfs_automount_task, nfs_mountpoint_expiry_timeout);
+out:
+	dprintk("%s: done, returned %d\n", __FUNCTION__, err);
+	return ERR_PTR(err);
+out_err:
+	path_release(nd);
+	goto out;
+out_follow:
+	while(d_mountpoint(nd->dentry) && follow_down(&nd->mnt, &nd->dentry))
+		;
+	err = 0;
+	goto out;
+}
+
+struct inode_operations nfs_mountpoint_inode_operations = {
+	.follow_link	= nfs_follow_mountpoint,
+	.getattr	= nfs_getattr,
+};
+
+struct inode_operations nfs_referral_inode_operations = {
+	.follow_link	= nfs_follow_mountpoint,
+};
+
+static void nfs_expire_automounts(void *data)
+{
+	struct list_head *list = (struct list_head *)data;
+
+	mark_mounts_for_expiry(list);
+	if (!list_empty(list))
+		schedule_delayed_work(&nfs_automount_task, nfs_mountpoint_expiry_timeout);
+}
+
+void nfs_release_automount_timer(void)
+{
+	if (list_empty(&nfs_automount_list)) {
+		cancel_delayed_work(&nfs_automount_task);
+		flush_scheduled_work();
+	}
+}
+
+/*
+ * Clone a mountpoint of the appropriate type
+ */
+static struct vfsmount *nfs_do_clone_mount(struct nfs_server *server, char *devname,
+					   struct nfs_clone_mount *mountdata)
+{
+#ifdef CONFIG_NFS_V4
+	struct vfsmount *mnt = NULL;
+	switch (server->rpc_ops->version) {
+		case 2:
+		case 3:
+			mnt = vfs_kern_mount(&clone_nfs_fs_type, 0, devname, mountdata);
+			break;
+		case 4:
+			mnt = vfs_kern_mount(&clone_nfs4_fs_type, 0, devname, mountdata);
+	}
+	return mnt;
+#else
+	return vfs_kern_mount(&clone_nfs_fs_type, 0, devname, mountdata);
+#endif
+}
+
+/**
+ * nfs_do_submount - set up mountpoint when crossing a filesystem boundary
+ * @mnt_parent - mountpoint of parent directory
+ * @dentry - parent directory
+ * @fh - filehandle for new root dentry
+ * @fattr - attributes for new root inode
+ *
+ */
+struct vfsmount *nfs_do_submount(const struct vfsmount *mnt_parent,
+		const struct dentry *dentry, struct nfs_fh *fh,
+		struct nfs_fattr *fattr)
+{
+	struct nfs_clone_mount mountdata = {
+		.sb = mnt_parent->mnt_sb,
+		.dentry = dentry,
+		.fh = fh,
+		.fattr = fattr,
+	};
+	struct vfsmount *mnt = ERR_PTR(-ENOMEM);
+	char *page = (char *) __get_free_page(GFP_USER);
+	char *devname;
+
+	dprintk("%s: submounting on %s/%s\n", __FUNCTION__,
+			dentry->d_parent->d_name.name,
+			dentry->d_name.name);
+	if (page == NULL)
+		goto out;
+	devname = nfs_devname(mnt_parent, dentry, page, PAGE_SIZE);
+	mnt = (struct vfsmount *)devname;
+	if (IS_ERR(devname))
+		goto free_page;
+	mnt = nfs_do_clone_mount(NFS_SB(mnt_parent->mnt_sb), devname, &mountdata);
+free_page:
+	free_page((unsigned long)page);
+out:
+	dprintk("%s: done\n", __FUNCTION__);
+	return mnt;
+}