smb: move client and server files to common directory fs/smb

Move CIFS/SMB3 related client and server files (cifs.ko and ksmbd.ko
and helper modules) to new fs/smb subdirectory:

   fs/cifs --> fs/smb/client
   fs/ksmbd --> fs/smb/server
   fs/smbfs_common --> fs/smb/common

Suggested-by: Linus Torvalds <torvalds@linux-foundation.org>
Acked-by: Namjae Jeon <linkinjeon@kernel.org>
Signed-off-by: Steve French <stfrench@microsoft.com>

1 files changed, 0 insertions, 643 deletions

diff --git a/fs/cifs/dfs.c b/fs/cifs/dfs.c
deleted file mode 100644
index 2f93bf8c3325..000000000000
--- a/fs/cifs/dfs.c
+++ /dev/null
@@ -1,643 +0,0 @@
-// SPDX-License-Identifier: GPL-2.0
-/*
- * Copyright (c) 2022 Paulo Alcantara <palcantara@suse.de>
- */
-
-#include <linux/namei.h>
-#include "cifsproto.h"
-#include "cifs_debug.h"
-#include "dns_resolve.h"
-#include "fs_context.h"
-#include "dfs.h"
-
-/**
- * dfs_parse_target_referral - set fs context for dfs target referral
- *
- * @full_path: full path in UNC format.
- * @ref: dfs referral pointer.
- * @ctx: smb3 fs context pointer.
- *
- * Return zero if dfs referral was parsed correctly, otherwise non-zero.
- */
-int dfs_parse_target_referral(const char *full_path, const struct dfs_info3_param *ref,
-			      struct smb3_fs_context *ctx)
-{
-	int rc;
-	const char *prepath = NULL;
-	char *path;
-
-	if (!full_path || !*full_path || !ref || !ctx)
-		return -EINVAL;
-
-	if (WARN_ON_ONCE(!ref->node_name || ref->path_consumed < 0))
-		return -EINVAL;
-
-	if (strlen(full_path) - ref->path_consumed) {
-		prepath = full_path + ref->path_consumed;
-		/* skip initial delimiter */
-		if (*prepath == '/' || *prepath == '\\')
-			prepath++;
-	}
-
-	path = cifs_build_devname(ref->node_name, prepath);
-	if (IS_ERR(path))
-		return PTR_ERR(path);
-
-	rc = smb3_parse_devname(path, ctx);
-	if (rc)
-		goto out;
-
-	rc = dns_resolve_server_name_to_ip(path, (struct sockaddr *)&ctx->dstaddr, NULL);
-
-out:
-	kfree(path);
-	return rc;
-}
-
-/*
- * cifs_build_path_to_root returns full path to root when we do not have an
- * existing connection (tcon)
- */
-static char *build_unc_path_to_root(const struct smb3_fs_context *ctx,
-				    const struct cifs_sb_info *cifs_sb, bool useppath)
-{
-	char *full_path, *pos;
-	unsigned int pplen = useppath && ctx->prepath ? strlen(ctx->prepath) + 1 : 0;
-	unsigned int unc_len = strnlen(ctx->UNC, MAX_TREE_SIZE + 1);
-
-	if (unc_len > MAX_TREE_SIZE)
-		return ERR_PTR(-EINVAL);
-
-	full_path = kmalloc(unc_len + pplen + 1, GFP_KERNEL);
-	if (full_path == NULL)
-		return ERR_PTR(-ENOMEM);
-
-	memcpy(full_path, ctx->UNC, unc_len);
-	pos = full_path + unc_len;
-
-	if (pplen) {
-		*pos = CIFS_DIR_SEP(cifs_sb);
-		memcpy(pos + 1, ctx->prepath, pplen);
-		pos += pplen;
-	}
-
-	*pos = '\0'; /* add trailing null */
-	convert_delimiter(full_path, CIFS_DIR_SEP(cifs_sb));
-	cifs_dbg(FYI, "%s: full_path=%s\n", __func__, full_path);
-	return full_path;
-}
-
-static int get_session(struct cifs_mount_ctx *mnt_ctx, const char *full_path)
-{
-	struct smb3_fs_context *ctx = mnt_ctx->fs_ctx;
-	int rc;
-
-	ctx->leaf_fullpath = (char *)full_path;
-	rc = cifs_mount_get_session(mnt_ctx);
-	ctx->leaf_fullpath = NULL;
-
-	return rc;
-}
-
-static int add_root_smb_session(struct cifs_mount_ctx *mnt_ctx)
-{
-	struct smb3_fs_context *ctx = mnt_ctx->fs_ctx;
-	struct dfs_root_ses *root_ses;
-	struct cifs_ses *ses = mnt_ctx->ses;
-
-	if (ses) {
-		root_ses = kmalloc(sizeof(*root_ses), GFP_KERNEL);
-		if (!root_ses)
-			return -ENOMEM;
-
-		INIT_LIST_HEAD(&root_ses->list);
-
-		spin_lock(&cifs_tcp_ses_lock);
-		ses->ses_count++;
-		spin_unlock(&cifs_tcp_ses_lock);
-		root_ses->ses = ses;
-		list_add_tail(&root_ses->list, &mnt_ctx->dfs_ses_list);
-	}
-	ctx->dfs_root_ses = ses;
-	return 0;
-}
-
-static int get_dfs_conn(struct cifs_mount_ctx *mnt_ctx, const char *ref_path, const char *full_path,
-			const struct dfs_cache_tgt_iterator *tit)
-{
-	struct smb3_fs_context *ctx = mnt_ctx->fs_ctx;
-	struct dfs_info3_param ref = {};
-	bool is_refsrv;
-	int rc, rc2;
-
-	rc = dfs_cache_get_tgt_referral(ref_path + 1, tit, &ref);
-	if (rc)
-		return rc;
-
-	rc = dfs_parse_target_referral(full_path + 1, &ref, ctx);
-	if (rc)
-		goto out;
-
-	cifs_mount_put_conns(mnt_ctx);
-	rc = get_session(mnt_ctx, ref_path);
-	if (rc)
-		goto out;
-
-	is_refsrv = !!(ref.flags & DFSREF_REFERRAL_SERVER);
-
-	rc = -EREMOTE;
-	if (ref.flags & DFSREF_STORAGE_SERVER) {
-		rc = cifs_mount_get_tcon(mnt_ctx);
-		if (rc)
-			goto out;
-
-		/* some servers may not advertise referral capability under ref.flags */
-		is_refsrv |= is_tcon_dfs(mnt_ctx->tcon);
-
-		rc = cifs_is_path_remote(mnt_ctx);
-	}
-
-	dfs_cache_noreq_update_tgthint(ref_path + 1, tit);
-
-	if (rc == -EREMOTE && is_refsrv) {
-		rc2 = add_root_smb_session(mnt_ctx);
-		if (rc2)
-			rc = rc2;
-	}
-
-out:
-	free_dfs_info_param(&ref);
-	return rc;
-}
-
-static int __dfs_mount_share(struct cifs_mount_ctx *mnt_ctx)
-{
-	struct cifs_sb_info *cifs_sb = mnt_ctx->cifs_sb;
-	struct smb3_fs_context *ctx = mnt_ctx->fs_ctx;
-	char *ref_path = NULL, *full_path = NULL;
-	struct dfs_cache_tgt_iterator *tit;
-	struct TCP_Server_Info *server;
-	struct cifs_tcon *tcon;
-	char *origin_fullpath = NULL;
-	int num_links = 0;
-	int rc;
-
-	ref_path = dfs_get_path(cifs_sb, ctx->UNC);
-	if (IS_ERR(ref_path))
-		return PTR_ERR(ref_path);
-
-	full_path = build_unc_path_to_root(ctx, cifs_sb, true);
-	if (IS_ERR(full_path)) {
-		rc = PTR_ERR(full_path);
-		full_path = NULL;
-		goto out;
-	}
-
-	origin_fullpath = kstrdup(full_path, GFP_KERNEL);
-	if (!origin_fullpath) {
-		rc = -ENOMEM;
-		goto out;
-	}
-
-	do {
-		struct dfs_cache_tgt_list tl = DFS_CACHE_TGT_LIST_INIT(tl);
-
-		rc = dfs_get_referral(mnt_ctx, ref_path + 1, NULL, &tl);
-		if (rc)
-			break;
-
-		tit = dfs_cache_get_tgt_iterator(&tl);
-		if (!tit) {
-			cifs_dbg(VFS, "%s: dfs referral (%s) with no targets\n", __func__,
-				 ref_path + 1);
-			rc = -ENOENT;
-			dfs_cache_free_tgts(&tl);
-			break;
-		}
-
-		do {
-			rc = get_dfs_conn(mnt_ctx, ref_path, full_path, tit);
-			if (!rc)
-				break;
-			if (rc == -EREMOTE) {
-				if (++num_links > MAX_NESTED_LINKS) {
-					rc = -ELOOP;
-					break;
-				}
-				kfree(ref_path);
-				kfree(full_path);
-				ref_path = full_path = NULL;
-
-				full_path = build_unc_path_to_root(ctx, cifs_sb, true);
-				if (IS_ERR(full_path)) {
-					rc = PTR_ERR(full_path);
-					full_path = NULL;
-				} else {
-					ref_path = dfs_get_path(cifs_sb, full_path);
-					if (IS_ERR(ref_path)) {
-						rc = PTR_ERR(ref_path);
-						ref_path = NULL;
-					}
-				}
-				break;
-			}
-		} while ((tit = dfs_cache_get_next_tgt(&tl, tit)));
-		dfs_cache_free_tgts(&tl);
-	} while (rc == -EREMOTE);
-
-	if (!rc) {
-		server = mnt_ctx->server;
-		tcon = mnt_ctx->tcon;
-
-		mutex_lock(&server->refpath_lock);
-		spin_lock(&server->srv_lock);
-		if (!server->origin_fullpath) {
-			server->origin_fullpath = origin_fullpath;
-			origin_fullpath = NULL;
-		}
-		spin_unlock(&server->srv_lock);
-		mutex_unlock(&server->refpath_lock);
-
-		if (list_empty(&tcon->dfs_ses_list)) {
-			list_replace_init(&mnt_ctx->dfs_ses_list,
-					  &tcon->dfs_ses_list);
-			queue_delayed_work(dfscache_wq, &tcon->dfs_cache_work,
-					   dfs_cache_get_ttl() * HZ);
-		} else {
-			dfs_put_root_smb_sessions(&mnt_ctx->dfs_ses_list);
-		}
-	}
-
-out:
-	kfree(origin_fullpath);
-	kfree(ref_path);
-	kfree(full_path);
-	return rc;
-}
-
-int dfs_mount_share(struct cifs_mount_ctx *mnt_ctx, bool *isdfs)
-{
-	struct smb3_fs_context *ctx = mnt_ctx->fs_ctx;
-	struct cifs_ses *ses;
-	char *source = ctx->source;
-	bool nodfs = ctx->nodfs;
-	int rc;
-
-	*isdfs = false;
-	/* Temporarily set @ctx->source to NULL as we're not matching DFS
-	 * superblocks yet.  See cifs_match_super() and match_server().
-	 */
-	ctx->source = NULL;
-	rc = get_session(mnt_ctx, NULL);
-	if (rc)
-		goto out;
-
-	ctx->dfs_root_ses = mnt_ctx->ses;
-	/*
-	 * If called with 'nodfs' mount option, then skip DFS resolving.  Otherwise unconditionally
-	 * try to get an DFS referral (even cached) to determine whether it is an DFS mount.
-	 *
-	 * Skip prefix path to provide support for DFS referrals from w2k8 servers which don't seem
-	 * to respond with PATH_NOT_COVERED to requests that include the prefix.
-	 */
-	if (!nodfs) {
-		rc = dfs_get_referral(mnt_ctx, ctx->UNC + 1, NULL, NULL);
-		if (rc) {
-			if (rc != -ENOENT && rc != -EOPNOTSUPP && rc != -EIO)
-				goto out;
-			nodfs = true;
-		}
-	}
-	if (nodfs) {
-		rc = cifs_mount_get_tcon(mnt_ctx);
-		if (!rc)
-			rc = cifs_is_path_remote(mnt_ctx);
-		goto out;
-	}
-
-	*isdfs = true;
-	/*
-	 * Prevent DFS root session of being put in the first call to
-	 * cifs_mount_put_conns().  If another DFS root server was not found
-	 * while chasing the referrals (@ctx->dfs_root_ses == @ses), then we
-	 * can safely put extra refcount of @ses.
-	 */
-	ses = mnt_ctx->ses;
-	mnt_ctx->ses = NULL;
-	mnt_ctx->server = NULL;
-	rc = __dfs_mount_share(mnt_ctx);
-	if (ses == ctx->dfs_root_ses)
-		cifs_put_smb_ses(ses);
-out:
-	/*
-	 * Restore previous value of @ctx->source so DFS superblock can be
-	 * matched in cifs_match_super().
-	 */
-	ctx->source = source;
-	return rc;
-}
-
-/* Update dfs referral path of superblock */
-static int update_server_fullpath(struct TCP_Server_Info *server, struct cifs_sb_info *cifs_sb,
-				  const char *target)
-{
-	int rc = 0;
-	size_t len = strlen(target);
-	char *refpath, *npath;
-
-	if (unlikely(len < 2 || *target != '\\'))
-		return -EINVAL;
-
-	if (target[1] == '\\') {
-		len += 1;
-		refpath = kmalloc(len, GFP_KERNEL);
-		if (!refpath)
-			return -ENOMEM;
-
-		scnprintf(refpath, len, "%s", target);
-	} else {
-		len += sizeof("\\");
-		refpath = kmalloc(len, GFP_KERNEL);
-		if (!refpath)
-			return -ENOMEM;
-
-		scnprintf(refpath, len, "\\%s", target);
-	}
-
-	npath = dfs_cache_canonical_path(refpath, cifs_sb->local_nls, cifs_remap(cifs_sb));
-	kfree(refpath);
-
-	if (IS_ERR(npath)) {
-		rc = PTR_ERR(npath);
-	} else {
-		mutex_lock(&server->refpath_lock);
-		spin_lock(&server->srv_lock);
-		kfree(server->leaf_fullpath);
-		server->leaf_fullpath = npath;
-		spin_unlock(&server->srv_lock);
-		mutex_unlock(&server->refpath_lock);
-	}
-	return rc;
-}
-
-static int target_share_matches_server(struct TCP_Server_Info *server, char *share,
-				       bool *target_match)
-{
-	int rc = 0;
-	const char *dfs_host;
-	size_t dfs_host_len;
-
-	*target_match = true;
-	extract_unc_hostname(share, &dfs_host, &dfs_host_len);
-
-	/* Check if hostnames or addresses match */
-	cifs_server_lock(server);
-	if (dfs_host_len != strlen(server->hostname) ||
-	    strncasecmp(dfs_host, server->hostname, dfs_host_len)) {
-		cifs_dbg(FYI, "%s: %.*s doesn't match %s\n", __func__,
-			 (int)dfs_host_len, dfs_host, server->hostname);
-		rc = match_target_ip(server, dfs_host, dfs_host_len, target_match);
-		if (rc)
-			cifs_dbg(VFS, "%s: failed to match target ip: %d\n", __func__, rc);
-	}
-	cifs_server_unlock(server);
-	return rc;
-}
-
-static void __tree_connect_ipc(const unsigned int xid, char *tree,
-			       struct cifs_sb_info *cifs_sb,
-			       struct cifs_ses *ses)
-{
-	struct TCP_Server_Info *server = ses->server;
-	struct cifs_tcon *tcon = ses->tcon_ipc;
-	int rc;
-
-	spin_lock(&ses->ses_lock);
-	spin_lock(&ses->chan_lock);
-	if (cifs_chan_needs_reconnect(ses, server) ||
-	    ses->ses_status != SES_GOOD) {
-		spin_unlock(&ses->chan_lock);
-		spin_unlock(&ses->ses_lock);
-		cifs_server_dbg(FYI, "%s: skipping ipc reconnect due to disconnected ses\n",
-				__func__);
-		return;
-	}
-	spin_unlock(&ses->chan_lock);
-	spin_unlock(&ses->ses_lock);
-
-	cifs_server_lock(server);
-	scnprintf(tree, MAX_TREE_SIZE, "\\\\%s\\IPC$", server->hostname);
-	cifs_server_unlock(server);
-
-	rc = server->ops->tree_connect(xid, ses, tree, tcon,
-				       cifs_sb->local_nls);
-	cifs_server_dbg(FYI, "%s: tree_reconnect %s: %d\n", __func__, tree, rc);
-	spin_lock(&tcon->tc_lock);
-	if (rc) {
-		tcon->status = TID_NEED_TCON;
-	} else {
-		tcon->status = TID_GOOD;
-		tcon->need_reconnect = false;
-	}
-	spin_unlock(&tcon->tc_lock);
-}
-
-static void tree_connect_ipc(const unsigned int xid, char *tree,
-			     struct cifs_sb_info *cifs_sb,
-			     struct cifs_tcon *tcon)
-{
-	struct cifs_ses *ses = tcon->ses;
-
-	__tree_connect_ipc(xid, tree, cifs_sb, ses);
-	__tree_connect_ipc(xid, tree, cifs_sb, CIFS_DFS_ROOT_SES(ses));
-}
-
-static int __tree_connect_dfs_target(const unsigned int xid, struct cifs_tcon *tcon,
-				     struct cifs_sb_info *cifs_sb, char *tree, bool islink,
-				     struct dfs_cache_tgt_list *tl)
-{
-	int rc;
-	struct TCP_Server_Info *server = tcon->ses->server;
-	const struct smb_version_operations *ops = server->ops;
-	struct cifs_ses *root_ses = CIFS_DFS_ROOT_SES(tcon->ses);
-	char *share = NULL, *prefix = NULL;
-	struct dfs_cache_tgt_iterator *tit;
-	bool target_match;
-
-	tit = dfs_cache_get_tgt_iterator(tl);
-	if (!tit) {
-		rc = -ENOENT;
-		goto out;
-	}
-
-	/* Try to tree connect to all dfs targets */
-	for (; tit; tit = dfs_cache_get_next_tgt(tl, tit)) {
-		const char *target = dfs_cache_get_tgt_name(tit);
-		struct dfs_cache_tgt_list ntl = DFS_CACHE_TGT_LIST_INIT(ntl);
-
-		kfree(share);
-		kfree(prefix);
-		share = prefix = NULL;
-
-		/* Check if share matches with tcp ses */
-		rc = dfs_cache_get_tgt_share(server->leaf_fullpath + 1, tit, &share, &prefix);
-		if (rc) {
-			cifs_dbg(VFS, "%s: failed to parse target share: %d\n", __func__, rc);
-			break;
-		}
-
-		rc = target_share_matches_server(server, share, &target_match);
-		if (rc)
-			break;
-		if (!target_match) {
-			rc = -EHOSTUNREACH;
-			continue;
-		}
-
-		dfs_cache_noreq_update_tgthint(server->leaf_fullpath + 1, tit);
-		tree_connect_ipc(xid, tree, cifs_sb, tcon);
-
-		scnprintf(tree, MAX_TREE_SIZE, "\\%s", share);
-		if (!islink) {
-			rc = ops->tree_connect(xid, tcon->ses, tree, tcon, cifs_sb->local_nls);
-			break;
-		}
-
-		/*
-		 * If no dfs referrals were returned from link target, then just do a TREE_CONNECT
-		 * to it.  Otherwise, cache the dfs referral and then mark current tcp ses for
-		 * reconnect so either the demultiplex thread or the echo worker will reconnect to
-		 * newly resolved target.
-		 */
-		if (dfs_cache_find(xid, root_ses, cifs_sb->local_nls, cifs_remap(cifs_sb), target,
-				   NULL, &ntl)) {
-			rc = ops->tree_connect(xid, tcon->ses, tree, tcon, cifs_sb->local_nls);
-			if (rc)
-				continue;
-
-			rc = cifs_update_super_prepath(cifs_sb, prefix);
-		} else {
-			/* Target is another dfs share */
-			rc = update_server_fullpath(server, cifs_sb, target);
-			dfs_cache_free_tgts(tl);
-
-			if (!rc) {
-				rc = -EREMOTE;
-				list_replace_init(&ntl.tl_list, &tl->tl_list);
-			} else
-				dfs_cache_free_tgts(&ntl);
-		}
-		break;
-	}
-
-out:
-	kfree(share);
-	kfree(prefix);
-
-	return rc;
-}
-
-static int tree_connect_dfs_target(const unsigned int xid, struct cifs_tcon *tcon,
-				   struct cifs_sb_info *cifs_sb, char *tree, bool islink,
-				   struct dfs_cache_tgt_list *tl)
-{
-	int rc;
-	int num_links = 0;
-	struct TCP_Server_Info *server = tcon->ses->server;
-	char *old_fullpath = server->leaf_fullpath;
-
-	do {
-		rc = __tree_connect_dfs_target(xid, tcon, cifs_sb, tree, islink, tl);
-		if (!rc || rc != -EREMOTE)
-			break;
-	} while (rc = -ELOOP, ++num_links < MAX_NESTED_LINKS);
-	/*
-	 * If we couldn't tree connect to any targets from last referral path, then
-	 * retry it from newly resolved dfs referral.
-	 */
-	if (rc && server->leaf_fullpath != old_fullpath)
-		cifs_signal_cifsd_for_reconnect(server, true);
-
-	dfs_cache_free_tgts(tl);
-	return rc;
-}
-
-int cifs_tree_connect(const unsigned int xid, struct cifs_tcon *tcon, const struct nls_table *nlsc)
-{
-	int rc;
-	struct TCP_Server_Info *server = tcon->ses->server;
-	const struct smb_version_operations *ops = server->ops;
-	struct super_block *sb = NULL;
-	struct cifs_sb_info *cifs_sb;
-	struct dfs_cache_tgt_list tl = DFS_CACHE_TGT_LIST_INIT(tl);
-	char *tree;
-	struct dfs_info3_param ref = {0};
-
-	/* only send once per connect */
-	spin_lock(&tcon->tc_lock);
-	if (tcon->status != TID_NEW &&
-	    tcon->status != TID_NEED_TCON) {
-		spin_unlock(&tcon->tc_lock);
-		return -EHOSTDOWN;
-	}
-
-	if (tcon->status == TID_GOOD) {
-		spin_unlock(&tcon->tc_lock);
-		return 0;
-	}
-	tcon->status = TID_IN_TCON;
-	spin_unlock(&tcon->tc_lock);
-
-	tree = kzalloc(MAX_TREE_SIZE, GFP_KERNEL);
-	if (!tree) {
-		rc = -ENOMEM;
-		goto out;
-	}
-
-	if (tcon->ipc) {
-		cifs_server_lock(server);
-		scnprintf(tree, MAX_TREE_SIZE, "\\\\%s\\IPC$", server->hostname);
-		cifs_server_unlock(server);
-		rc = ops->tree_connect(xid, tcon->ses, tree, tcon, nlsc);
-		goto out;
-	}
-
-	sb = cifs_get_tcp_super(server);
-	if (IS_ERR(sb)) {
-		rc = PTR_ERR(sb);
-		cifs_dbg(VFS, "%s: could not find superblock: %d\n", __func__, rc);
-		goto out;
-	}
-
-	cifs_sb = CIFS_SB(sb);
-
-	/* If it is not dfs or there was no cached dfs referral, then reconnect to same share */
-	if (!server->leaf_fullpath ||
-	    dfs_cache_noreq_find(server->leaf_fullpath + 1, &ref, &tl)) {
-		rc = ops->tree_connect(xid, tcon->ses, tcon->tree_name, tcon, cifs_sb->local_nls);
-		goto out;
-	}
-
-	rc = tree_connect_dfs_target(xid, tcon, cifs_sb, tree, ref.server_type == DFS_TYPE_LINK,
-				     &tl);
-	free_dfs_info_param(&ref);
-
-out:
-	kfree(tree);
-	cifs_put_tcp_super(sb);
-
-	if (rc) {
-		spin_lock(&tcon->tc_lock);
-		if (tcon->status == TID_IN_TCON)
-			tcon->status = TID_NEED_TCON;
-		spin_unlock(&tcon->tc_lock);
-	} else {
-		spin_lock(&tcon->tc_lock);
-		if (tcon->status == TID_IN_TCON)
-			tcon->status = TID_GOOD;
-		spin_unlock(&tcon->tc_lock);
-		tcon->need_reconnect = false;
-	}
-
-	return rc;
-}