[PATCH] smbfs - smbiod

This patch for 2.5.25 is a rewrite of how smbfs builds requests. It allows
for more parallellism, better error handling and supporting oplocks with
further patches.

fs/smbfs/Makefile

@@ -4,7 +4,8 @@
 
 obj-$(CONFIG_SMB_FS) += smbfs.o
 
-smbfs-objs := proc.o dir.o cache.o sock.o inode.o file.o ioctl.o getopt.o
+smbfs-objs := proc.o dir.o cache.o sock.o inode.o file.o ioctl.o getopt.o \
+		smbiod.o request.o
 
 # If you want debugging output, you may add these flags to the EXTRA_CFLAGS
 # SMBFS_PARANOIA should normally be enabled.
@@ -23,7 +24,7 @@ include $(TOPDIR)/Rules.make
 #
 
 # getopt.c not included. It is intentionally separate
-SRC = proc.c dir.c cache.c sock.c inode.c file.c ioctl.c
+SRC = proc.c dir.c cache.c sock.c inode.c file.c ioctl.c smbiod.c request.c
 
 proto:
 	-rm -f proto.h
@@ -31,5 +32,7 @@ proto:
 	@echo >> proto2.h " *  Autogenerated with cproto on: " `date`
 	@echo >> proto2.h " */"
 	@echo >> proto2.h ""
+	@echo >> proto2.h "struct smb_request;"
+	@echo >> proto2.h ""
 	cproto -E "gcc -E" -e -v -I $(TOPDIR)/include -DMAKING_PROTO -D__KERNEL__ $(SRC) >> proto2.h
 	mv proto2.h proto.h

fs/smbfs/file.c

@@ -42,9 +42,7 @@ smb_fsync(struct file *file, struct dentry * dentry, int datasync)
 	 * Note: this function requires all pages to have been written already
 	 *       (should be ok with writepage_sync)
 	 */
-	smb_lock_server(server);
 	result = smb_proc_flush(server, SMB_I(dentry->d_inode)->fileid);
-	smb_unlock_server(server);
 	return result;
 }
 
@@ -129,7 +127,7 @@ smb_writepage_sync(struct inode *inode, struct page *page,
 
 	offset = ((loff_t)page->index << PAGE_CACHE_SHIFT) + pageoffset;
 	VERBOSE("file ino=%ld, fileid=%d, count=%d@%Ld, wsize=%d\n",
-		inode->i_ino, inode->u.smbfs_i.fileid, count, offset, wsize);
+		inode->i_ino, SMB_I(inode)->fileid, count, offset, wsize);
 
 	do {
 		if (count < wsize)

fs/smbfs/inode.c

@@ -434,17 +434,17 @@ smb_put_super(struct super_block *sb)
 {
 	struct smb_sb_info *server = SMB_SB(sb);
 
-	if (server->sock_file) {
-		smb_dont_catch_keepalive(server);
-		fput(server->sock_file);
-	}
+	smbiod_unregister_server(server);
+
+	smb_lock_server(server);
+	server->state = CONN_INVALID;
+
+	smb_close_socket(server);
 
 	if (server->conn_pid)
 		kill_proc(server->conn_pid, SIGTERM, 1);
 
 	smb_kfree(server->ops);
-	if (server->packet)
-		smb_vfree(server->packet);
 
 	if (server->remote_nls) {
 		unload_nls(server->remote_nls);
@@ -455,6 +455,7 @@ smb_put_super(struct super_block *sb)
 		server->local_nls = NULL;
 	}
 	sb->u.generic_sbp = NULL;
+	smb_unlock_server(server);
 	smb_kfree(server);
 }
 
@@ -491,32 +492,25 @@ int smb_fill_super(struct super_block *sb, void *raw_data, int silent)
 	server->mnt = NULL;
 	server->sock_file = NULL;
 	init_MUTEX(&server->sem);
-	init_waitqueue_head(&server->wait);
+	INIT_LIST_HEAD(&server->entry);
+	INIT_LIST_HEAD(&server->xmitq);
+	INIT_LIST_HEAD(&server->recvq);
+	server->conn_error = 0;
 	server->conn_pid = 0;
 	server->state = CONN_INVALID; /* no connection yet */
 	server->generation = 0;
-	server->packet_size = smb_round_length(SMB_INITIAL_PACKET_SIZE);
-	server->packet = smb_vmalloc(server->packet_size);
-	if (!server->packet)
-		goto out_no_mem;
 
 	/* Allocate the global temp buffer and some superblock helper structs */
+	/* FIXME: move these to the smb_sb_info struct */
 	VERBOSE("alloc chunk = %d\n", sizeof(struct smb_ops) +
-		sizeof(struct smb_mount_data_kernel) +
-		2*SMB_MAXPATHLEN + 20);
+		sizeof(struct smb_mount_data_kernel));
 	mem = smb_kmalloc(sizeof(struct smb_ops) +
-			  sizeof(struct smb_mount_data_kernel) +
-			  2*SMB_MAXPATHLEN + 20, GFP_KERNEL);
+			  sizeof(struct smb_mount_data_kernel), GFP_KERNEL);
 	if (!mem)
-		goto out_no_temp;
+		goto out_no_mem;
 
 	server->ops = mem;
 	server->mnt = mem + sizeof(struct smb_ops);
-	server->name_buf = mem + sizeof(struct smb_ops) +
-		sizeof(struct smb_mount_data_kernel);
-	server->temp_buf = mem + sizeof(struct smb_ops) +
-		sizeof(struct smb_mount_data_kernel) +
-		SMB_MAXPATHLEN + 1;
 
 	/* Setup NLS stuff */
 	server->remote_nls = NULL;
@@ -573,14 +567,14 @@ int smb_fill_super(struct super_block *sb, void *raw_data, int silent)
 		goto out_no_root;
 	smb_new_dentry(sb->s_root);
 
+	smbiod_register_server(server);
+
 	return 0;
 
 out_no_root:
 	iput(root_inode);
 out_bad_option:
 	smb_kfree(mem);
-out_no_temp:
-	smb_vfree(server->packet);
 out_no_mem:
 	if (!server->mnt)
 		printk(KERN_ERR "smb_fill_super: allocation failure\n");
@@ -764,14 +758,19 @@ static int __init init_smb_fs(void)
 
 	err = init_inodecache();
 	if (err)
-		goto out1;
+		goto out_inode;
+	err = smb_init_request_cache();
+	if (err)
+		goto out_request;
 	err = register_filesystem(&smb_fs_type);
 	if (err)
 		goto out;
 	return 0;
 out:
+	smb_destroy_request_cache();
+out_request:
 	destroy_inodecache();
-out1:
+out_inode:
 	return err;
 }
 
@@ -779,6 +778,7 @@ static void __exit exit_smb_fs(void)
 {
 	DEBUG1("unregistering ...\n");
 	unregister_filesystem(&smb_fs_type);
+	smb_destroy_request_cache();
 	destroy_inodecache();
 #ifdef DEBUG_SMB_MALLOC
 	printk(KERN_DEBUG "smb_malloced: %d\n", smb_malloced);

fs/smbfs/ioctl.c

@@ -41,7 +41,13 @@ smb_ioctl(struct inode *inode, struct file *filp,
 	case SMB_IOC_NEWCONN:
 		/* arg is smb_conn_opt, or NULL if no connection was made */
 		if (!arg) {
-			result = smb_wakeup(server);
+			result = 0;
+			smb_lock_server(server);
+			server->state = CONN_RETRIED;
+			printk(KERN_ERR "Connection attempt failed!  [%d]\n",
+			       server->conn_error);
+			smbiod_flush(server);
+			smb_unlock_server(server);
 			break;
 		}
 

fs/smbfs/proto.h

 /*
- *  Autogenerated with cproto on:  Thu Nov 22 21:18:04 CET 2001
+ *  Autogenerated with cproto on:  Fri Jul 12 22:15:26 CEST 2002
  */
 
+struct smb_request;
+
 /* proc.c */
 extern int smb_setcodepage(struct smb_sb_info *server, struct smb_nls_codepage *cp);
 extern __u32 smb_len(__u8 *p);
 extern int smb_get_rsize(struct smb_sb_info *server);
 extern int smb_get_wsize(struct smb_sb_info *server);
-extern int smb_errno(struct smb_sb_info *server);
+extern int smb_errno(struct smb_request *req);
 extern int smb_newconn(struct smb_sb_info *server, struct smb_conn_opt *opt);
-extern int smb_wakeup(struct smb_sb_info *server);
-extern __u8 *smb_setup_header(struct smb_sb_info *server, __u8 command, __u16 wct, __u16 bcc);
+extern __u8 *smb_setup_header(struct smb_request *req, __u8 command, __u16 wct, __u16 bcc);
 extern int smb_open(struct dentry *dentry, int wish);
 extern int smb_close(struct inode *ino);
 extern int smb_close_fileid(struct dentry *dentry, __u16 fileid);
@@ -36,19 +37,21 @@ extern void smb_invalidate_dircache_entries(struct dentry *parent);
 extern struct dentry *smb_dget_fpos(struct dentry *dentry, struct dentry *parent, unsigned long fpos);
 extern int smb_fill_cache(struct file *filp, void *dirent, filldir_t filldir, struct smb_cache_control *ctrl, struct qstr *qname, struct smb_fattr *entry);
 /* sock.c */
+extern void smb_data_ready(struct sock *sk, int len);
 extern int smb_valid_socket(struct inode *inode);
-extern int smb_catch_keepalive(struct smb_sb_info *server);
-extern int smb_dont_catch_keepalive(struct smb_sb_info *server);
 extern void smb_close_socket(struct smb_sb_info *server);
-extern int smb_round_length(int len);
-extern int smb_request(struct smb_sb_info *server);
-extern int smb_trans2_request(struct smb_sb_info *server, __u16 trans2_command, int ldata, unsigned char *data, int lparam, unsigned char *param, int *lrdata, unsigned char **rdata, int *lrparam, unsigned char **rparam);
+extern int smb_recv_available(struct smb_sb_info *server);
+extern int smb_receive_header(struct smb_sb_info *server);
+extern int smb_receive_drop(struct smb_sb_info *server);
+extern int smb_receive(struct smb_sb_info *server, struct smb_request *req);
+extern int smb_send_request(struct smb_request *req);
 /* inode.c */
 extern struct inode *smb_iget(struct super_block *sb, struct smb_fattr *fattr);
 extern void smb_get_inode_attr(struct inode *inode, struct smb_fattr *fattr);
 extern void smb_set_inode_attr(struct inode *inode, struct smb_fattr *fattr);
 extern void smb_invalidate_inodes(struct smb_sb_info *server);
 extern int smb_revalidate_inode(struct dentry *dentry);
+extern int smb_fill_super(struct super_block *sb, void *raw_data, int silent);
 extern int smb_getattr(struct vfsmount *mnt, struct dentry *dentry, struct kstat *stat);
 extern int smb_notify_change(struct dentry *dentry, struct iattr *attr);
 /* file.c */
@@ -57,3 +60,19 @@ extern struct file_operations smb_file_operations;
 extern struct inode_operations smb_file_inode_operations;
 /* ioctl.c */
 extern int smb_ioctl(struct inode *inode, struct file *filp, unsigned int cmd, unsigned long arg);
+/* smbiod.c */
+extern void smbiod_wake_up(void);
+extern void smbiod_register_server(struct smb_sb_info *server);
+extern void smbiod_unregister_server(struct smb_sb_info *server);
+extern void smbiod_flush(struct smb_sb_info *server);
+extern int smbiod_retry(struct smb_sb_info *server);
+/* request.c */
+extern int smb_init_request_cache(void);
+extern void smb_destroy_request_cache(void);
+extern struct smb_request *smb_alloc_request(struct smb_sb_info *server, int bufsize);
+extern void smb_rget(struct smb_request *req);
+extern void smb_rput(struct smb_request *req);
+extern int smb_add_request(struct smb_request *req);
+extern int smb_request_send_req(struct smb_request *req);
+extern int smb_request_send_server(struct smb_sb_info *server);
+extern int smb_request_recv(struct smb_sb_info *server);

fs/smbfs/request.h

+#include <linux/types.h>
+#include <linux/wait.h>
+#include <linux/list.h>
+
+struct smb_request {
+	struct list_head rq_queue;	/* recvq or xmitq for the server */
+
+	atomic_t rq_count;
+
+	wait_queue_head_t rq_wait;
+	int rq_flags;
+	int rq_mid;	/* multiplex ID, set by request.c */
+
+	struct smb_sb_info *rq_server;
+
+	/* header + word count + parameter words + byte count */
+	unsigned char rq_header[SMB_HEADER_LEN + 20*2 + 2];
+
+	int rq_bufsize;
+	unsigned char *rq_buffer;
+
+	/* FIXME: this is not good enough for merging IO requests. */
+	unsigned char *rq_page;
+	int rq_rsize;
+
+	int rq_resp_wct;
+	int rq_resp_bcc;
+
+	int rq_rlen;
+	int rq_bytes_recvd;
+
+	int rq_slen;
+	int rq_bytes_sent;
+
+	int rq_iovlen;
+	struct iovec rq_iov[4];
+
+	int (*rq_setup_read) (struct smb_request *);
+	void (*rq_callback) (struct smb_request *);
+
+	/* ------ trans2 stuff ------ */
+
+	u16 rq_trans2_command;	/* 0 if not a trans2 request */
+	unsigned int rq_ldata;
+	unsigned char *rq_data;
+	unsigned int rq_lparm;
+	unsigned char *rq_parm;
+
+	int rq_fragment;
+	u32 rq_total_data;
+	u32 rq_total_parm;
+	int rq_trans2bufsize;
+	unsigned char *rq_trans2buffer;
+
+	/* ------ response ------ */
+
+	unsigned short rq_rcls;
+	unsigned short rq_err;
+	int rq_errno;
+};
+
+#define SMB_REQ_STATIC		0x0001	/* rq_buffer is static */
+#define SMB_REQ_NORETRY		0x0002	/* request is invalid after retry */
+
+#define SMB_REQ_TRANSMITTED	0x4000	/* all data has been sent */
+#define SMB_REQ_RECEIVED	0x8000	/* reply received, smbiod is done */
+
+#define xSMB_REQ_NOREPLY	0x0004	/* we don't want the reply (if any) */
+#define xSMB_REQ_NORECEIVER	0x0008	/* caller doesn't wait for response */

fs/smbfs/smbiod.c

+/*
+ *  smbiod.c
+ *
+ *  Copyright (C) 2000, Charles Loep / Corel Corp.
+ *  Copyright (C) 2001, Urban Widmark
+ */
+
+#include <linux/config.h>
+
+#include <linux/sched.h>
+#include <linux/kernel.h>
+#include <linux/mm.h>
+#include <linux/string.h>
+#include <linux/stat.h>
+#include <linux/errno.h>
+#include <linux/slab.h>
+#include <linux/init.h>
+#include <linux/file.h>
+#include <linux/dcache.h>
+#include <linux/smp_lock.h>
+#include <net/ip.h>
+
+#include <linux/smb_fs.h>
+#include <linux/smbno.h>
+#include <linux/smb_mount.h>
+
+#include <asm/system.h>
+#include <asm/uaccess.h>
+
+#include "smb_debug.h"
+#include "request.h"
+#include "proto.h"
+
+static int smbiod_pid = -1;
+static DECLARE_WAIT_QUEUE_HEAD(smbiod_wait);
+static LIST_HEAD(smb_servers);
+static spinlock_t servers_lock = SPIN_LOCK_UNLOCKED;
+
+#define SMBIOD_DATA_READY	(1<<0)
+static long smbiod_flags;
+
+static int smbiod(void *);
+static void smbiod_start(void);
+static void smbiod_stop(void);
+
+/*
+ * called when there's work for us to do
+ */
+void smbiod_wake_up()
+{
+	if (smbiod_pid == -1)
+		return;
+	set_bit(SMBIOD_DATA_READY, &smbiod_flags);
+	wake_up_interruptible(&smbiod_wait);
+}
+
+/*
+ * start smbiod if none is running
+ */
+static void smbiod_start()
+{
+	if (smbiod_pid != -1)
+		return;
+	smbiod_pid = kernel_thread(smbiod, NULL, 0);
+}
+
+/*
+ * stop smbiod if there are no open connections
+ */
+static void smbiod_stop()
+{
+	if (smbiod_pid != -1 && list_empty(&smb_servers))
+		kill_proc(smbiod_pid, SIGKILL, 1);
+}
+
+/*
+ * register a server & start smbiod if necessary
+ */
+void smbiod_register_server(struct smb_sb_info *server)
+{
+	spin_lock(&servers_lock);
+	list_add(&server->entry, &smb_servers);
+	VERBOSE("%p\n", server);
+	smbiod_start();
+	spin_unlock(&servers_lock);
+}
+
+/*
+ * unregister a server & stop smbiod if necessary
+ */
+void smbiod_unregister_server(struct smb_sb_info *server)
+{
+	spin_lock(&servers_lock);
+	list_del_init(&server->entry);
+	VERBOSE("%p\n", server);
+	smbiod_stop();
+	spin_unlock(&servers_lock);
+
+	smb_lock_server(server);
+	smbiod_flush(server);
+	smb_unlock_server(server);
+}
+
+void smbiod_flush(struct smb_sb_info *server)
+{
+	struct list_head *tmp, *n;
+	struct smb_request *req;
+
+	list_for_each_safe(tmp, n, &server->xmitq) {
+		req = list_entry(tmp, struct smb_request, rq_queue);
+		req->rq_errno = -EIO;
+		list_del_init(&req->rq_queue);
+		smb_rput(req);
+		wake_up_interruptible(&req->rq_wait);
+	}
+	list_for_each_safe(tmp, n, &server->recvq) {
+		req = list_entry(tmp, struct smb_request, rq_queue);
+		req->rq_errno = -EIO;
+		list_del_init(&req->rq_queue);
+		smb_rput(req);
+		wake_up_interruptible(&req->rq_wait);
+	}
+}
+
+/*
+ * Wake up smbmount and make it reconnect to the server.
+ * This must be called with the server locked.
+ *
+ * FIXME: add smbconnect version to this
+ */
+int smbiod_retry(struct smb_sb_info *server)
+{
+	struct list_head *head;
+	struct smb_request *req;
+	pid_t pid = server->conn_pid;
+	int result = 0;
+
+	VERBOSE("state: %d\n", server->state);
+	if (server->state == CONN_VALID || server->state == CONN_RETRYING)
+		goto out;
+
+	smb_invalidate_inodes(server);
+
+	/*
+	 * Some requests are meaningless after a retry, so we abort them.
+	 * One example are all requests using 'fileid' since the files are
+	 * closed on retry.
+	 */
+	head = server->xmitq.next;
+	while (head != &server->xmitq) {
+		req = list_entry(head, struct smb_request, rq_queue);
+		head = head->next;
+		if (req->rq_flags & SMB_REQ_NORETRY) {
+			VERBOSE("aborting request %p on xmitq\n", req);
+			req->rq_errno = -EIO;
+			list_del_init(&req->rq_queue);
+			smb_rput(req);
+			wake_up_interruptible(&req->rq_wait);
+		}
+	}
+
+	/*
+	 * FIXME: test the code for retrying request we already sent
+	 */
+	head = server->recvq.next;
+	while (head != &server->recvq) {
+		req = list_entry(head, struct smb_request, rq_queue);
+		head = head->next;
+#if 0
+		if (req->rq_flags & SMB_REQ_RETRY) {
+			/* must move the request to the xmitq */
+			VERBOSE("retrying request %p on recvq\n", req);
+			list_del(&req->rq_queue);
+			list_add(&req->rq_queue, &server->xmitq);
+			continue;
+		}
+#endif
+
+		VERBOSE("aborting request %p on recvq\n", req);
+		/* req->rq_rcls = ???; */ /* FIXME: set smb error code too? */
+		req->rq_errno = -EIO;
+		list_del_init(&req->rq_queue);
+		smb_rput(req);
+		wake_up_interruptible(&req->rq_wait);
+	}
+
+	smb_close_socket(server);
+
+	if (pid == 0) {
+		/* FIXME: this is fatal, umount? */
+		printk(KERN_ERR "smb_retry: no connection process\n");
+		server->state = CONN_RETRIED;
+		goto out;
+	}
+
+	/*
+	 * Change state so that only one retry per server will be started.
+	 */
+	server->state = CONN_RETRYING;
+
+	/*
+	 * Note: use the "priv" flag, as a user process may need to reconnect.
+	 */
+	result = kill_proc(pid, SIGUSR1, 1);
+	if (result) {
+		/* FIXME: this is most likely fatal, umount? */
+		printk(KERN_ERR "smb_retry: signal failed [%d]\n", result);
+		goto out;
+	}
+	VERBOSE("signalled pid %d\n", pid);
+
+	/* FIXME: The retried requests should perhaps get a "time boost". */
+
+out:
+	return result;
+}
+
+/*
+ * Currently handles lockingX packets.
+ */
+static void smbiod_handle_request(struct smb_sb_info *server)
+{
+	PARANOIA("smbiod got a request ... and we don't implement oplocks!\n");
+	server->rstate = SMB_RECV_DROP;
+}
+
+/*
+ * Do some IO for one server.
+ */
+static void smbiod_doio(struct smb_sb_info *server)
+{
+	int result;
+	int maxwork = 7;
+
+	if (server->state != CONN_VALID)
+		goto out;
+
+	do {
+		result = smb_request_recv(server);
+		if (result < 0) {
+			server->state = CONN_INVALID;
+			smbiod_retry(server);
+			goto out;	/* reconnecting is slow */
+		} else if (server->rstate == SMB_RECV_REQUEST)
+			smbiod_handle_request(server);
+	} while (result > 0 && maxwork-- > 0);
+
+	/*
+	 * If there is more to read then we want to be sure to wake up again.
+	 */
+	if (server->state != CONN_VALID)
+		goto out;
+	if (smb_recv_available(server) > 0)
+		set_bit(SMBIOD_DATA_READY, &smbiod_flags);
+
+	do {
+		result = smb_request_send_server(server);
+		if (result < 0) {
+			server->state = CONN_INVALID;
+			smbiod_retry(server);
+			goto out;	/* reconnecting is slow */
+		}
+	} while (result > 0);
+
+	/*
+	 * If the last request was not sent out we want to wake up again.
+	 */
+	if (!list_empty(&server->xmitq))
+		set_bit(SMBIOD_DATA_READY, &smbiod_flags);
+
+out:
+}
+
+/*
+ * smbiod kernel thread
+ */
+static int smbiod(void *unused)
+{
+	daemonize();
+
+	spin_lock_irq(&current->sigmask_lock);
+	siginitsetinv(&current->blocked, sigmask(SIGKILL));
+	recalc_sigpending();
+	spin_unlock_irq(&current->sigmask_lock);
+
+	strcpy(current->comm, "smbiod");
+
+	VERBOSE("SMB Kernel thread starting (%d) ...\n", current->pid);
+
+	for (;;) {
+		struct smb_sb_info *server;
+		struct list_head *pos, *n;
+
+		/* FIXME: Use poll? */
+		wait_event_interruptible(smbiod_wait,
+			 test_bit(SMBIOD_DATA_READY, &smbiod_flags));
+		if (signal_pending(current))
+			break;
+
+		clear_bit(SMBIOD_DATA_READY, &smbiod_flags);
+
+		/*
+		 * We must hold the servers_lock while looking for servers
+		 * to check or else we have a race with put_super.
+		 */
+		spin_lock(&servers_lock);
+		list_for_each_safe(pos, n, &smb_servers) {
+			server = list_entry(pos, struct smb_sb_info, entry);
+			VERBOSE("checking server %p\n", server);
+			smb_lock_server(server);
+			spin_unlock(&servers_lock);
+
+			smbiod_doio(server);
+
+			smb_unlock_server(server);
+			spin_lock(&servers_lock);
+		}
+		spin_unlock(&servers_lock);
+	}
+
+	VERBOSE("SMB Kernel thread exiting (%d) ...\n", current->pid);
+	smbiod_pid = -1;
+
+	return 0;
+}

include/linux/smb_fs_sb.h

@@ -14,17 +14,42 @@
 #include <linux/types.h>
 #include <linux/smb.h>
 
+/*
+ * Upper limit on the total number of active smb_request structs.
+ */
+#define MAX_REQUEST_HARD       256
+
+enum smb_receive_state {
+	SMB_RECV_START,		/* No data read, looking for length + sig */
+	SMB_RECV_HEADER,	/* Reading the header data */
+	SMB_RECV_HCOMPLETE,	/* Done with the header */
+	SMB_RECV_PARAM,		/* Reading parameter words */
+	SMB_RECV_DATA,		/* Reading data bytes */
+	SMB_RECV_END,		/* End of request */
+	SMB_RECV_DROP,		/* Dropping this SMB */
+	SMB_RECV_REQUEST,	/* Received a request and not a reply */
+};
+
 /* structure access macros */
 #define server_from_inode(inode) SMB_SB((inode)->i_sb)
 #define server_from_dentry(dentry) SMB_SB((dentry)->d_sb)
 #define SB_of(server) ((server)->super_block)
 
 struct smb_sb_info {
+	/* List of all smbfs superblocks */
+	struct list_head entry;
+
         enum smb_conn_state state;
 	struct file * sock_file;
+	int conn_error;
+	enum smb_receive_state rstate;
+
+	atomic_t nr_requests;
+	struct list_head xmitq;
+	struct list_head recvq;
+	u16 mid;
 
         struct smb_mount_data_kernel *mnt;
-        unsigned char *temp_buf;
 
 	/* Connections are counted. Each time a new socket arrives,
 	 * generation is incremented.
@@ -34,13 +59,15 @@ struct smb_sb_info {
 	struct smb_conn_opt opt;
 
 	struct semaphore sem;
-	wait_queue_head_t wait;
 
-	__u32              packet_size;
-	unsigned char *    packet;
         unsigned short     rcls; /* The error codes we received */
         unsigned short     err;
 
+	unsigned char      header[SMB_HEADER_LEN + 20*2 + 2];
+	u32                header_len;
+	u32                smb_len;
+	u32                smb_read;
+
         /* We use our own data_ready callback, but need the original one */
         void *data_ready;
 
@@ -48,15 +75,16 @@ struct smb_sb_info {
 	struct nls_table *remote_nls;
 	struct nls_table *local_nls;
 
-	/* utf8 can make strings longer so we can't do in-place conversion.
-	   This is a buffer for temporary stuff. We only need one so no need
-	   to put it on the stack. This points to temp_buf space. */
-	char *name_buf;
-
 	struct smb_ops *ops;
+
 	struct super_block *super_block;
 };
 
+static inline int
+smb_lock_server_interruptible(struct smb_sb_info *server)
+{
+	return down_interruptible(&(server->sem));
+}
 
 static inline void
 smb_lock_server(struct smb_sb_info *server)