Linux-2.6.12-rc2
Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
This commit is contained in:
Linus Torvalds
341
fs/smbfs/smbiod.c
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341
fs/smbfs/smbiod.c
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/*
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* smbiod.c
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*
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* Copyright (C) 2000, Charles Loep / Corel Corp.
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* Copyright (C) 2001, Urban Widmark
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*/
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#include <linux/config.h>
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#include <linux/sched.h>
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#include <linux/kernel.h>
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#include <linux/mm.h>
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#include <linux/string.h>
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#include <linux/stat.h>
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#include <linux/errno.h>
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#include <linux/slab.h>
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#include <linux/init.h>
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#include <linux/file.h>
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#include <linux/dcache.h>
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#include <linux/smp_lock.h>
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#include <linux/module.h>
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#include <linux/net.h>
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#include <net/ip.h>
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#include <linux/smb_fs.h>
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#include <linux/smbno.h>
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#include <linux/smb_mount.h>
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#include <asm/system.h>
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#include <asm/uaccess.h>
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#include "smb_debug.h"
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#include "request.h"
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#include "proto.h"
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enum smbiod_state {
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SMBIOD_DEAD,
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SMBIOD_STARTING,
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SMBIOD_RUNNING,
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};
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static enum smbiod_state smbiod_state = SMBIOD_DEAD;
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static pid_t smbiod_pid;
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static DECLARE_WAIT_QUEUE_HEAD(smbiod_wait);
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static LIST_HEAD(smb_servers);
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static DEFINE_SPINLOCK(servers_lock);
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#define SMBIOD_DATA_READY (1<<0)
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static long smbiod_flags;
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static int smbiod(void *);
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static int smbiod_start(void);
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/*
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* called when there's work for us to do
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*/
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void smbiod_wake_up(void)
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{
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if (smbiod_state == SMBIOD_DEAD)
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return;
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set_bit(SMBIOD_DATA_READY, &smbiod_flags);
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wake_up_interruptible(&smbiod_wait);
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}
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/*
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* start smbiod if none is running
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*/
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static int smbiod_start(void)
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{
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pid_t pid;
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if (smbiod_state != SMBIOD_DEAD)
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return 0;
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smbiod_state = SMBIOD_STARTING;
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__module_get(THIS_MODULE);
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spin_unlock(&servers_lock);
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pid = kernel_thread(smbiod, NULL, 0);
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if (pid < 0)
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module_put(THIS_MODULE);
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spin_lock(&servers_lock);
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smbiod_state = pid < 0 ? SMBIOD_DEAD : SMBIOD_RUNNING;
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smbiod_pid = pid;
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return pid;
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}
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/*
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* register a server & start smbiod if necessary
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*/
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int smbiod_register_server(struct smb_sb_info *server)
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{
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int ret;
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spin_lock(&servers_lock);
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list_add(&server->entry, &smb_servers);
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VERBOSE("%p\n", server);
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ret = smbiod_start();
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spin_unlock(&servers_lock);
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return ret;
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}
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/*
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* Unregister a server
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* Must be called with the server lock held.
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*/
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void smbiod_unregister_server(struct smb_sb_info *server)
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{
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spin_lock(&servers_lock);
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list_del_init(&server->entry);
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VERBOSE("%p\n", server);
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spin_unlock(&servers_lock);
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smbiod_wake_up();
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smbiod_flush(server);
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}
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void smbiod_flush(struct smb_sb_info *server)
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{
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struct list_head *tmp, *n;
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struct smb_request *req;
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list_for_each_safe(tmp, n, &server->xmitq) {
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req = list_entry(tmp, struct smb_request, rq_queue);
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req->rq_errno = -EIO;
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list_del_init(&req->rq_queue);
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smb_rput(req);
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wake_up_interruptible(&req->rq_wait);
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}
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list_for_each_safe(tmp, n, &server->recvq) {
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req = list_entry(tmp, struct smb_request, rq_queue);
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req->rq_errno = -EIO;
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list_del_init(&req->rq_queue);
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smb_rput(req);
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wake_up_interruptible(&req->rq_wait);
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}
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}
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/*
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* Wake up smbmount and make it reconnect to the server.
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* This must be called with the server locked.
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*
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* FIXME: add smbconnect version to this
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*/
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int smbiod_retry(struct smb_sb_info *server)
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{
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struct list_head *head;
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struct smb_request *req;
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pid_t pid = server->conn_pid;
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int result = 0;
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VERBOSE("state: %d\n", server->state);
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if (server->state == CONN_VALID || server->state == CONN_RETRYING)
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goto out;
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smb_invalidate_inodes(server);
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/*
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* Some requests are meaningless after a retry, so we abort them.
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* One example are all requests using 'fileid' since the files are
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* closed on retry.
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*/
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head = server->xmitq.next;
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while (head != &server->xmitq) {
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req = list_entry(head, struct smb_request, rq_queue);
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head = head->next;
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req->rq_bytes_sent = 0;
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if (req->rq_flags & SMB_REQ_NORETRY) {
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VERBOSE("aborting request %p on xmitq\n", req);
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req->rq_errno = -EIO;
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list_del_init(&req->rq_queue);
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smb_rput(req);
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wake_up_interruptible(&req->rq_wait);
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}
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}
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/*
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* FIXME: test the code for retrying request we already sent
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*/
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head = server->recvq.next;
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while (head != &server->recvq) {
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req = list_entry(head, struct smb_request, rq_queue);
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head = head->next;
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#if 0
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if (req->rq_flags & SMB_REQ_RETRY) {
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/* must move the request to the xmitq */
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VERBOSE("retrying request %p on recvq\n", req);
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list_del(&req->rq_queue);
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list_add(&req->rq_queue, &server->xmitq);
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continue;
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}
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#endif
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VERBOSE("aborting request %p on recvq\n", req);
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/* req->rq_rcls = ???; */ /* FIXME: set smb error code too? */
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req->rq_errno = -EIO;
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list_del_init(&req->rq_queue);
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smb_rput(req);
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wake_up_interruptible(&req->rq_wait);
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}
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smb_close_socket(server);
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if (pid == 0) {
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/* FIXME: this is fatal, umount? */
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printk(KERN_ERR "smb_retry: no connection process\n");
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server->state = CONN_RETRIED;
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goto out;
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}
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/*
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* Change state so that only one retry per server will be started.
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*/
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server->state = CONN_RETRYING;
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/*
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* Note: use the "priv" flag, as a user process may need to reconnect.
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*/
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result = kill_proc(pid, SIGUSR1, 1);
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if (result) {
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/* FIXME: this is most likely fatal, umount? */
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printk(KERN_ERR "smb_retry: signal failed [%d]\n", result);
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goto out;
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}
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VERBOSE("signalled pid %d\n", pid);
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/* FIXME: The retried requests should perhaps get a "time boost". */
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out:
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return result;
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}
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/*
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* Currently handles lockingX packets.
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*/
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static void smbiod_handle_request(struct smb_sb_info *server)
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{
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PARANOIA("smbiod got a request ... and we don't implement oplocks!\n");
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server->rstate = SMB_RECV_DROP;
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}
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/*
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* Do some IO for one server.
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*/
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static void smbiod_doio(struct smb_sb_info *server)
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{
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int result;
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int maxwork = 7;
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if (server->state != CONN_VALID)
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goto out;
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do {
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result = smb_request_recv(server);
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if (result < 0) {
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server->state = CONN_INVALID;
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smbiod_retry(server);
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goto out; /* reconnecting is slow */
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} else if (server->rstate == SMB_RECV_REQUEST)
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smbiod_handle_request(server);
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} while (result > 0 && maxwork-- > 0);
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/*
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* If there is more to read then we want to be sure to wake up again.
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*/
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if (server->state != CONN_VALID)
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goto out;
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if (smb_recv_available(server) > 0)
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set_bit(SMBIOD_DATA_READY, &smbiod_flags);
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do {
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result = smb_request_send_server(server);
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if (result < 0) {
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server->state = CONN_INVALID;
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smbiod_retry(server);
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goto out; /* reconnecting is slow */
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}
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} while (result > 0);
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/*
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* If the last request was not sent out we want to wake up again.
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*/
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if (!list_empty(&server->xmitq))
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set_bit(SMBIOD_DATA_READY, &smbiod_flags);
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out:
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return;
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}
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/*
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* smbiod kernel thread
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*/
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static int smbiod(void *unused)
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{
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daemonize("smbiod");
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allow_signal(SIGKILL);
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VERBOSE("SMB Kernel thread starting (%d) ...\n", current->pid);
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for (;;) {
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struct smb_sb_info *server;
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struct list_head *pos, *n;
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/* FIXME: Use poll? */
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wait_event_interruptible(smbiod_wait,
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test_bit(SMBIOD_DATA_READY, &smbiod_flags));
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if (signal_pending(current)) {
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spin_lock(&servers_lock);
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smbiod_state = SMBIOD_DEAD;
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spin_unlock(&servers_lock);
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break;
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}
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clear_bit(SMBIOD_DATA_READY, &smbiod_flags);
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spin_lock(&servers_lock);
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if (list_empty(&smb_servers)) {
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smbiod_state = SMBIOD_DEAD;
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spin_unlock(&servers_lock);
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break;
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}
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list_for_each_safe(pos, n, &smb_servers) {
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server = list_entry(pos, struct smb_sb_info, entry);
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VERBOSE("checking server %p\n", server);
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if (server->state == CONN_VALID) {
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spin_unlock(&servers_lock);
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smb_lock_server(server);
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smbiod_doio(server);
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smb_unlock_server(server);
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spin_lock(&servers_lock);
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}
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}
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spin_unlock(&servers_lock);
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}
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VERBOSE("SMB Kernel thread exiting (%d) ...\n", current->pid);
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module_put_and_exit(0);
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}
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