/* * Copyright (C) 2006-2010 Red Hat, Inc. All rights reserved. * * This copyrighted material is made available to anyone wishing to use, * modify, copy, or redistribute it subject to the terms and conditions * of the GNU General Public License v.2. */ #include #include #include #include #include #include #include #include #include #include #include #include #include "dlm_internal.h" #include "lockspace.h" #include "lock.h" #include "lvb_table.h" #include "user.h" #include "ast.h" static const char name_prefix[] = "dlm"; static const struct file_operations device_fops; static atomic_t dlm_monitor_opened; static int dlm_monitor_unused = 1; #ifdef CONFIG_COMPAT struct dlm_lock_params32 { __u8 mode; __u8 namelen; __u16 unused; __u32 flags; __u32 lkid; __u32 parent; __u64 xid; __u64 timeout; __u32 castparam; __u32 castaddr; __u32 bastparam; __u32 bastaddr; __u32 lksb; char lvb[DLM_USER_LVB_LEN]; char name[0]; }; struct dlm_write_request32 { __u32 version[3]; __u8 cmd; __u8 is64bit; __u8 unused[2]; union { struct dlm_lock_params32 lock; struct dlm_lspace_params lspace; struct dlm_purge_params purge; } i; }; struct dlm_lksb32 { __u32 sb_status; __u32 sb_lkid; __u8 sb_flags; __u32 sb_lvbptr; }; struct dlm_lock_result32 { __u32 version[3]; __u32 length; __u32 user_astaddr; __u32 user_astparam; __u32 user_lksb; struct dlm_lksb32 lksb; __u8 bast_mode; __u8 unused[3]; /* Offsets may be zero if no data is present */ __u32 lvb_offset; }; static void compat_input(struct dlm_write_request *kb, struct dlm_write_request32 *kb32, int namelen) { kb->version[0] = kb32->version[0]; kb->version[1] = kb32->version[1]; kb->version[2] = kb32->version[2]; kb->cmd = kb32->cmd; kb->is64bit = kb32->is64bit; if (kb->cmd == DLM_USER_CREATE_LOCKSPACE || kb->cmd == DLM_USER_REMOVE_LOCKSPACE) { kb->i.lspace.flags = kb32->i.lspace.flags; kb->i.lspace.minor = kb32->i.lspace.minor; memcpy(kb->i.lspace.name, kb32->i.lspace.name, namelen); } else if (kb->cmd == DLM_USER_PURGE) { kb->i.purge.nodeid = kb32->i.purge.nodeid; kb->i.purge.pid = kb32->i.purge.pid; } else { kb->i.lock.mode = kb32->i.lock.mode; kb->i.lock.namelen = kb32->i.lock.namelen; kb->i.lock.flags = kb32->i.lock.flags; kb->i.lock.lkid = kb32->i.lock.lkid; kb->i.lock.parent = kb32->i.lock.parent; kb->i.lock.xid = kb32->i.lock.xid; kb->i.lock.timeout = kb32->i.lock.timeout; kb->i.lock.castparam = (void *)(long)kb32->i.lock.castparam; kb->i.lock.castaddr = (void *)(long)kb32->i.lock.castaddr; kb->i.lock.bastparam = (void *)(long)kb32->i.lock.bastparam; kb->i.lock.bastaddr = (void *)(long)kb32->i.lock.bastaddr; kb->i.lock.lksb = (void *)(long)kb32->i.lock.lksb; memcpy(kb->i.lock.lvb, kb32->i.lock.lvb, DLM_USER_LVB_LEN); memcpy(kb->i.lock.name, kb32->i.lock.name, namelen); } } static void compat_output(struct dlm_lock_result *res, struct dlm_lock_result32 *res32) { res32->version[0] = res->version[0]; res32->version[1] = res->version[1]; res32->version[2] = res->version[2]; res32->user_astaddr = (__u32)(long)res->user_astaddr; res32->user_astparam = (__u32)(long)res->user_astparam; res32->user_lksb = (__u32)(long)res->user_lksb; res32->bast_mode = res->bast_mode; res32->lvb_offset = res->lvb_offset; res32->length = res->length; res32->lksb.sb_status = res->lksb.sb_status; res32->lksb.sb_flags = res->lksb.sb_flags; res32->lksb.sb_lkid = res->lksb.sb_lkid; res32->lksb.sb_lvbptr = (__u32)(long)res->lksb.sb_lvbptr; } #endif /* Figure out if this lock is at the end of its life and no longer available for the application to use. The lkb still exists until the final ast is read. A lock becomes EOL in three situations: 1. a noqueue request fails with EAGAIN 2. an unlock completes with EUNLOCK 3. a cancel of a waiting request completes with ECANCEL/EDEADLK An EOL lock needs to be removed from the process's list of locks. And we can't allow any new operation on an EOL lock. This is not related to the lifetime of the lkb struct which is managed entirely by refcount. */ static int lkb_is_endoflife(int mode, int status) { switch (status) { case -DLM_EUNLOCK: return 1; case -DLM_ECANCEL: case -ETIMEDOUT: case -EDEADLK: case -EAGAIN: if (mode == DLM_LOCK_IV) return 1; break; } return 0; } /* we could possibly check if the cancel of an orphan has resulted in the lkb being removed and then remove that lkb from the orphans list and free it */ void dlm_user_add_ast(struct dlm_lkb *lkb, uint32_t flags, int mode, int status, uint32_t sbflags, uint64_t seq) { struct dlm_ls *ls; struct dlm_user_args *ua; struct dlm_user_proc *proc; int rv; if (lkb->lkb_flags & (DLM_IFL_ORPHAN | DLM_IFL_DEAD)) return; ls = lkb->lkb_resource->res_ls; mutex_lock(&ls->ls_clear_proc_locks); /* If ORPHAN/DEAD flag is set, it means the process is dead so an ast can't be delivered. For ORPHAN's, dlm_clear_proc_locks() freed lkb->ua 
/*
 * <linux/usb/audio.h> -- USB Audio definitions.
 *
 * Copyright (C) 2006 Thumtronics Pty Ltd.
 * Developed for Thumtronics by Grey Innovation
 * Ben Williamson <ben.williamson@greyinnovation.com>
 *
 * This software is distributed under the terms of the GNU General Public
 * License ("GPL") version 2, as published by the Free Software Foundation.
 *
 * This file holds USB constants and structures defined
 * by the USB Device Class Definition for Audio Devices.
 * Comments below reference relevant sections of that document:
 *
 * http://www.usb.org/developers/devclass_docs/audio10.pdf
 *
 * Types and defines in this file are either specific to version 1.0 of
 * this standard or common for newer versions.
 */
#ifndef __LINUX_USB_AUDIO_H
#define __LINUX_USB_AUDIO_H

#include <uapi/linux/usb/audio.h>


struct usb_audio_control {
	struct list_head list;
	const char *name;
	u8 type;
	int data[5];
	int (*set)(struct usb_audio_control *con, u8 cmd, int value);
	int (*get)(struct usb_audio_control *con, u8 cmd);
};

struct usb_audio_control_selector {
	struct list_head list;
	struct list_head control;
	u8 id;
	const char *name;
	u8 type;
	struct usb_descriptor_header *desc;
};

#endif /* __LINUX_USB_AUDIO_H */
ersion ver; memset(&ver, 0, sizeof(struct dlm_device_version)); ver.version[0] = DLM_DEVICE_VERSION_MAJOR; ver.version[1] = DLM_DEVICE_VERSION_MINOR; ver.version[2] = DLM_DEVICE_VERSION_PATCH; if (copy_to_user(buf, &ver, sizeof(struct dlm_device_version))) return -EFAULT; return sizeof(struct dlm_device_version); } /* a read returns a single ast described in a struct dlm_lock_result */ static ssize_t device_read(struct file *file, char __user *buf, size_t count, loff_t *ppos) { struct dlm_user_proc *proc = file->private_data; struct dlm_lkb *lkb; DECLARE_WAITQUEUE(wait, current); struct dlm_callback cb; int rv, resid, copy_lvb = 0; if (count == sizeof(struct dlm_device_version)) { rv = copy_version_to_user(buf, count); return rv; } if (!proc) { log_print("non-version read from control device %zu", count); return -EINVAL; } #ifdef CONFIG_COMPAT if (count < sizeof(struct dlm_lock_result32)) #else if (count < sizeof(struct dlm_lock_result)) #endif return -EINVAL; try_another: /* do we really need this? can a read happen after a close? */ if (test_bit(DLM_PROC_FLAGS_CLOSING, &proc->flags)) return -EINVAL; spin_lock(&proc->asts_spin); if (list_empty(&proc->asts)) { if (file->f_flags & O_NONBLOCK) { spin_unlock(&proc->asts_spin); return -EAGAIN; } add_wait_queue(&proc->wait, &wait); repeat: set_current_state(TASK_INTERRUPTIBLE); if (list_empty(&proc->asts) && !signal_pending(current)) { spin_unlock(&proc->asts_spin); schedule(); spin_lock(&proc->asts_spin); goto repeat; } set_current_state(TASK_RUNNING); remove_wait_queue(&proc->wait, &wait); if (signal_pending(current)) { spin_unlock(&proc->asts_spin); return -ERESTARTSYS; } } /* if we empty lkb_callbacks, we don't want to unlock the spinlock without removing lkb_cb_list; so empty lkb_cb_list is always consistent with empty lkb_callbacks */ lkb = list_entry(proc->asts.next, struct dlm_lkb, lkb_cb_list); rv = dlm_rem_lkb_callback(lkb->lkb_resource->res_ls, lkb, &cb, &resid); if (rv < 0) { /* this shouldn't happen; lkb should have been removed from list when resid was zero */ log_print("dlm_rem_lkb_callback empty %x", lkb->lkb_id); list_del_init(&lkb->lkb_cb_list); spin_unlock(&proc->asts_spin); /* removes ref for proc->asts, may cause lkb to be freed */ dlm_put_lkb(lkb); goto try_another; } if (!resid) list_del_init(&lkb->lkb_cb_list); spin_unlock(&proc->asts_spin); if (cb.flags & DLM_CB_SKIP) { /* removes ref for proc->asts, may cause lkb to be freed */ if (!resid) dlm_put_lkb(lkb); goto try_another; } if (cb.flags & DLM_CB_CAST) { int old_mode, new_mode; old_mode = lkb->lkb_last_cast.mode; new_mode = cb.mode; if (!cb.sb_status && lkb->lkb_lksb->sb_lvbptr && dlm_lvb_operations[old_mode + 1][new_mode + 1]) copy_lvb = 1; lkb->lkb_lksb->sb_status = cb.sb_status; lkb->lkb_lksb->sb_flags = cb.sb_flags; } rv = copy_result_to_user(lkb->lkb_ua, test_bit(DLM_PROC_FLAGS_COMPAT, &proc->flags), cb.flags, cb.mode, copy_lvb, buf, count); /* removes ref for proc->asts, may cause lkb to be freed */ if (!resid) dlm_put_lkb(lkb); return rv; } static unsigned int device_poll(struct file *file, poll_table *wait) { struct dlm_user_proc *proc = file->private_data; poll_wait(file, &proc->wait, wait); spin_lock(&proc->asts_spin); if (!list_empty(&proc->asts)) { spin_unlock(&proc->asts_spin); return POLLIN | POLLRDNORM; } spin_unlock(&proc->asts_spin); return 0; } int dlm_user_daemon_available(void) { /* dlm_controld hasn't started (or, has started, but not properly populated configfs) */ if (!dlm_our_nodeid()) return 0; /* This is to deal with versions of dlm_controld that don't know about the monitor device. We assume that if the dlm_controld was started (above), but the monitor device was never opened, that it's an old version. dlm_controld should open the monitor device before populating configfs. */ if (dlm_monitor_unused) return 1; return atomic_read(&dlm_monitor_opened) ? 1 : 0; } static int ctl_device_open(struct inode *inode, struct file *file) { file->private_data = NULL; return 0; } static int ctl_device_close(struct inode *inode, struct file *file) { return 0; } static int monitor_device_open(struct inode *inode, struct file *file) { atomic_inc(&dlm_monitor_opened); dlm_monitor_unused = 0; return 0; } static int monitor_device_close(struct inode *inode, struct file *file) { if (atomic_dec_and_test(&dlm_monitor_opened)) dlm_stop_lockspaces(); return 0; } static const struct file_operations device_fops = { .open = device_open, .release = device_close, .read = device_read, .write = device_write, .poll = device_poll, .owner = THIS_MODULE, .llseek = noop_llseek, }; static const struct file_operations ctl_device_fops = { .open = ctl_device_open, .release = ctl_device_close, .read = device_read, .write = device_write, .owner = THIS_MODULE, .llseek = noop_llseek, }; static struct miscdevice ctl_device = { .name = "dlm-control", .fops = &ctl_device_fops, .minor = MISC_DYNAMIC_MINOR, }; static const struct file_operations monitor_device_fops = { .open = monitor_device_open, .release = monitor_device_close, .owner = THIS_MODULE, .llseek = noop_llseek, }; static struct miscdevice monitor_device = { .name = "dlm-monitor", .fops = &monitor_device_fops, .minor = MISC_DYNAMIC_MINOR, }; int __init dlm_user_init(void) { int error; atomic_set(&dlm_monitor_opened, 0); error = misc_register(&ctl_device); if (error) { log_print("misc_register failed for control device"); goto out; } error = misc_register(&monitor_device); if (error) { log_print("misc_register failed for monitor device"); misc_deregister(&ctl_device); } out: return error; } void dlm_user_exit(void) { misc_deregister(&ctl_device); misc_deregister(&monitor_device); }