smb: client: rename cifs_dfs_ref.c to namespace.c

The automount code will handle both DFS links and reparse files that
are mount points.

Signed-off-by: Paulo Alcantara (SUSE) <pc@manguebit.com>
Signed-off-by: Steve French <stfrench@microsoft.com>

1 files changed, 0 insertions, 238 deletions

diff --git a/fs/smb/client/cifs_dfs_ref.c b/fs/smb/client/cifs_dfs_ref.c
deleted file mode 100644
index b1c2499b1c3b..000000000000
--- a/fs/smb/client/cifs_dfs_ref.c
+++ /dev/null
@@ -1,238 +0,0 @@
-// SPDX-License-Identifier: GPL-2.0-or-later
-/*
- *   Contains the CIFS DFS referral mounting routines used for handling
- *   traversal via DFS junction point
- *
- *   Copyright (c) 2007 Igor Mammedov
- *   Copyright (C) International Business Machines  Corp., 2008
- *   Author(s): Igor Mammedov (niallain@gmail.com)
- *		Steve French (sfrench@us.ibm.com)
- */
-
-#include <linux/dcache.h>
-#include <linux/mount.h>
-#include <linux/namei.h>
-#include <linux/slab.h>
-#include <linux/vfs.h>
-#include <linux/fs.h>
-#include <linux/inet.h>
-#include "cifsglob.h"
-#include "cifsproto.h"
-#include "cifsfs.h"
-#include "dns_resolve.h"
-#include "cifs_debug.h"
-#include "dfs.h"
-#include "fs_context.h"
-
-static LIST_HEAD(cifs_dfs_automount_list);
-
-static void cifs_dfs_expire_automounts(struct work_struct *work);
-static DECLARE_DELAYED_WORK(cifs_dfs_automount_task,
-			    cifs_dfs_expire_automounts);
-static int cifs_dfs_mountpoint_expiry_timeout = 500 * HZ;
-
-static void cifs_dfs_expire_automounts(struct work_struct *work)
-{
-	struct list_head *list = &cifs_dfs_automount_list;
-
-	mark_mounts_for_expiry(list);
-	if (!list_empty(list))
-		schedule_delayed_work(&cifs_dfs_automount_task,
-				      cifs_dfs_mountpoint_expiry_timeout);
-}
-
-void cifs_dfs_release_automount_timer(void)
-{
-	BUG_ON(!list_empty(&cifs_dfs_automount_list));
-	cancel_delayed_work_sync(&cifs_dfs_automount_task);
-}
-
-/**
- * cifs_build_devname - build a devicename from a UNC and optional prepath
- * @nodename:	pointer to UNC string
- * @prepath:	pointer to prefixpath (or NULL if there isn't one)
- *
- * Build a new cifs devicename after chasing a DFS referral. Allocate a buffer
- * big enough to hold the final thing. Copy the UNC from the nodename, and
- * concatenate the prepath onto the end of it if there is one.
- *
- * Returns pointer to the built string, or a ERR_PTR. Caller is responsible
- * for freeing the returned string.
- */
-char *
-cifs_build_devname(char *nodename, const char *prepath)
-{
-	size_t pplen;
-	size_t unclen;
-	char *dev;
-	char *pos;
-
-	/* skip over any preceding delimiters */
-	nodename += strspn(nodename, "\\");
-	if (!*nodename)
-		return ERR_PTR(-EINVAL);
-
-	/* get length of UNC and set pos to last char */
-	unclen = strlen(nodename);
-	pos = nodename + unclen - 1;
-
-	/* trim off any trailing delimiters */
-	while (*pos == '\\') {
-		--pos;
-		--unclen;
-	}
-
-	/* allocate a buffer:
-	 * +2 for preceding "//"
-	 * +1 for delimiter between UNC and prepath
-	 * +1 for trailing NULL
-	 */
-	pplen = prepath ? strlen(prepath) : 0;
-	dev = kmalloc(2 + unclen + 1 + pplen + 1, GFP_KERNEL);
-	if (!dev)
-		return ERR_PTR(-ENOMEM);
-
-	pos = dev;
-	/* add the initial "//" */
-	*pos = '/';
-	++pos;
-	*pos = '/';
-	++pos;
-
-	/* copy in the UNC portion from referral */
-	memcpy(pos, nodename, unclen);
-	pos += unclen;
-
-	/* copy the prefixpath remainder (if there is one) */
-	if (pplen) {
-		*pos = '/';
-		++pos;
-		memcpy(pos, prepath, pplen);
-		pos += pplen;
-	}
-
-	/* NULL terminator */
-	*pos = '\0';
-
-	convert_delimiter(dev, '/');
-	return dev;
-}
-
-static int set_dest_addr(struct smb3_fs_context *ctx)
-{
-	struct sockaddr *addr = (struct sockaddr *)&ctx->dstaddr;
-	int rc;
-
-	rc = dns_resolve_server_name_to_ip(ctx->source, addr, NULL);
-	if (!rc)
-		cifs_set_port(addr, ctx->port);
-	return rc;
-}
-
-/*
- * Create a vfsmount that we can automount
- */
-static struct vfsmount *cifs_dfs_do_automount(struct path *path)
-{
-	int rc;
-	struct dentry *mntpt = path->dentry;
-	struct fs_context *fc;
-	struct cifs_sb_info *cifs_sb;
-	void *page = NULL;
-	struct smb3_fs_context *ctx, *cur_ctx;
-	struct smb3_fs_context tmp;
-	char *full_path;
-	struct vfsmount *mnt;
-
-	if (IS_ROOT(mntpt))
-		return ERR_PTR(-ESTALE);
-
-	/*
-	 * The MSDFS spec states that paths in DFS referral requests and
-	 * responses must be prefixed by a single '\' character instead of
-	 * the double backslashes usually used in the UNC. This function
-	 * gives us the latter, so we must adjust the result.
-	 */
-	cifs_sb = CIFS_SB(mntpt->d_sb);
-	if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_DFS)
-		return ERR_PTR(-EREMOTE);
-
-	cur_ctx = cifs_sb->ctx;
-
-	fc = fs_context_for_submount(path->mnt->mnt_sb->s_type, mntpt);
-	if (IS_ERR(fc))
-		return ERR_CAST(fc);
-
-	ctx = smb3_fc2context(fc);
-
-	page = alloc_dentry_path();
-	full_path = dfs_get_automount_devname(mntpt, page);
-	if (IS_ERR(full_path)) {
-		mnt = ERR_CAST(full_path);
-		goto out;
-	}
-
-	tmp = *cur_ctx;
-	tmp.source = NULL;
-	tmp.leaf_fullpath = NULL;
-	tmp.UNC = tmp.prepath = NULL;
-	tmp.dfs_root_ses = NULL;
-
-	rc = smb3_fs_context_dup(ctx, &tmp);
-	if (rc) {
-		mnt = ERR_PTR(rc);
-		goto out;
-	}
-
-	rc = smb3_parse_devname(full_path, ctx);
-	if (rc) {
-		mnt = ERR_PTR(rc);
-		goto out;
-	}
-
-	ctx->source = smb3_fs_context_fullpath(ctx, '/');
-	if (IS_ERR(ctx->source)) {
-		mnt = ERR_CAST(ctx->source);
-		ctx->source = NULL;
-		goto out;
-	}
-	cifs_dbg(FYI, "%s: ctx: source=%s UNC=%s prepath=%s dstaddr=%pISpc\n",
-		 __func__, ctx->source, ctx->UNC, ctx->prepath, &ctx->dstaddr);
-
-	rc = set_dest_addr(ctx);
-	if (!rc)
-		mnt = fc_mount(fc);
-	else
-		mnt = ERR_PTR(rc);
-
-out:
-	put_fs_context(fc);
-	free_dentry_path(page);
-	return mnt;
-}
-
-/*
- * Attempt to automount the referral
- */
-struct vfsmount *cifs_dfs_d_automount(struct path *path)
-{
-	struct vfsmount *newmnt;
-
-	cifs_dbg(FYI, "%s: %pd\n", __func__, path->dentry);
-
-	newmnt = cifs_dfs_do_automount(path);
-	if (IS_ERR(newmnt)) {
-		cifs_dbg(FYI, "leaving %s [automount failed]\n" , __func__);
-		return newmnt;
-	}
-
-	mntget(newmnt); /* prevent immediate expiration */
-	mnt_set_expiry(newmnt, &cifs_dfs_automount_list);
-	schedule_delayed_work(&cifs_dfs_automount_task,
-			      cifs_dfs_mountpoint_expiry_timeout);
-	cifs_dbg(FYI, "leaving %s [ok]\n" , __func__);
-	return newmnt;
-}
-
-const struct inode_operations cifs_dfs_referral_inode_operations = {
-};