ide-proc.c

linux 内核源代码

	ide_drive_t	*drive = (ide_drive_t *) data;
	char		name[MAX_LEN + 1];
	int		for_real = 0;
	unsigned long	n;
	ide_settings_t	*setting;
	char *buf, *s;

	if (!capable(CAP_SYS_ADMIN))
		return -EACCES;

	proc_ide_settings_warn();

	if (count >= PAGE_SIZE)
		return -EINVAL;

	s = buf = (char *)__get_free_page(GFP_USER);
	if (!buf)
		return -ENOMEM;

	if (copy_from_user(buf, buffer, count)) {
		free_page((unsigned long)buf);
		return -EFAULT;
	}

	buf[count] = '\0';

	/*
	 * Skip over leading whitespace
	 */
	while (count && isspace(*s)) {
		--count;
		++s;
	}
	/*
	 * Do one full pass to verify all parameters,
	 * then do another to actually write the new settings.
	 */
	do {
		char *p = s;
		n = count;
		while (n > 0) {
			unsigned val;
			char *q = p;

			while (n > 0 && *p != ':') {
				--n;
				p++;
			}
			if (*p != ':')
				goto parse_error;
			if (p - q > MAX_LEN)
				goto parse_error;
			memcpy(name, q, p - q);
			name[p - q] = 0;

			if (n > 0) {
				--n;
				p++;
			} else
				goto parse_error;

			val = simple_strtoul(p, &q, 10);
			n -= q - p;
			p = q;
			if (n > 0 && !isspace(*p))
				goto parse_error;
			while (n > 0 && isspace(*p)) {
				--n;
				++p;
			}

			mutex_lock(&ide_setting_mtx);
			setting = ide_find_setting_by_name(drive, name);
			if (!setting)
			{
				mutex_unlock(&ide_setting_mtx);
				goto parse_error;
			}
			if (for_real)
				ide_write_setting(drive, setting, val * setting->div_factor / setting->mul_factor);
			mutex_unlock(&ide_setting_mtx);
		}
	} while (!for_real++);
	free_page((unsigned long)buf);
	return count;
parse_error:
	free_page((unsigned long)buf);
	printk("proc_ide_write_settings(): parse error\n");
	return -EINVAL;
}

int proc_ide_read_capacity
	(char *page, char **start, off_t off, int count, int *eof, void *data)
{
	int len = sprintf(page,"%llu\n", (long long)0x7fffffff);
	PROC_IDE_READ_RETURN(page,start,off,count,eof,len);
}

EXPORT_SYMBOL_GPL(proc_ide_read_capacity);

int proc_ide_read_geometry
	(char *page, char **start, off_t off, int count, int *eof, void *data)
{
	ide_drive_t	*drive = (ide_drive_t *) data;
	char		*out = page;
	int		len;

	out += sprintf(out,"physical     %d/%d/%d\n",
			drive->cyl, drive->head, drive->sect);
	out += sprintf(out,"logical      %d/%d/%d\n",
			drive->bios_cyl, drive->bios_head, drive->bios_sect);

	len = out - page;
	PROC_IDE_READ_RETURN(page,start,off,count,eof,len);
}

EXPORT_SYMBOL(proc_ide_read_geometry);

static int proc_ide_read_dmodel
	(char *page, char **start, off_t off, int count, int *eof, void *data)
{
	ide_drive_t	*drive = (ide_drive_t *) data;
	struct hd_driveid *id = drive->id;
	int		len;

	len = sprintf(page, "%.40s\n",
		(id && id->model[0]) ? (char *)id->model : "(none)");
	PROC_IDE_READ_RETURN(page,start,off,count,eof,len);
}

static int proc_ide_read_driver
	(char *page, char **start, off_t off, int count, int *eof, void *data)
{
	ide_drive_t	*drive = (ide_drive_t *) data;
	struct device	*dev = &drive->gendev;
	ide_driver_t	*ide_drv;
	int		len;

	if (dev->driver) {
		ide_drv = container_of(dev->driver, ide_driver_t, gen_driver);
		len = sprintf(page, "%s version %s\n",
				dev->driver->name, ide_drv->version);
	} else
		len = sprintf(page, "ide-default version 0.9.newide\n");
	PROC_IDE_READ_RETURN(page,start,off,count,eof,len);
}

static int ide_replace_subdriver(ide_drive_t *drive, const char *driver)
{
	struct device *dev = &drive->gendev;
	int ret = 1;
	int err;

	device_release_driver(dev);
	/* FIXME: device can still be in use by previous driver */
	strlcpy(drive->driver_req, driver, sizeof(drive->driver_req));
	err = device_attach(dev);
	if (err < 0)
		printk(KERN_WARNING "IDE: %s: device_attach error: %d\n",
			__FUNCTION__, err);
	drive->driver_req[0] = 0;
	if (dev->driver == NULL) {
		err = device_attach(dev);
		if (err < 0)
			printk(KERN_WARNING
				"IDE: %s: device_attach(2) error: %d\n",
				__FUNCTION__, err);
	}
	if (dev->driver && !strcmp(dev->driver->name, driver))
		ret = 0;

	return ret;
}

static int proc_ide_write_driver
	(struct file *file, const char __user *buffer, unsigned long count, void *data)
{
	ide_drive_t	*drive = (ide_drive_t *) data;
	char name[32];

	if (!capable(CAP_SYS_ADMIN))
		return -EACCES;
	if (count > 31)
		count = 31;
	if (copy_from_user(name, buffer, count))
		return -EFAULT;
	name[count] = '\0';
	if (ide_replace_subdriver(drive, name))
		return -EINVAL;
	return count;
}

static int proc_ide_read_media
	(char *page, char **start, off_t off, int count, int *eof, void *data)
{
	ide_drive_t	*drive = (ide_drive_t *) data;
	const char	*media;
	int		len;

	switch (drive->media) {
		case ide_disk:	media = "disk\n";
				break;
		case ide_cdrom:	media = "cdrom\n";
				break;
		case ide_tape:	media = "tape\n";
				break;
		case ide_floppy:media = "floppy\n";
				break;
		case ide_optical:media = "optical\n";
				break;
		default:	media = "UNKNOWN\n";
				break;
	}
	strcpy(page,media);
	len = strlen(media);
	PROC_IDE_READ_RETURN(page,start,off,count,eof,len);
}

static ide_proc_entry_t generic_drive_entries[] = {
	{ "driver",	S_IFREG|S_IRUGO,	proc_ide_read_driver,	proc_ide_write_driver },
	{ "identify",	S_IFREG|S_IRUSR,	proc_ide_read_identify,	NULL },
	{ "media",	S_IFREG|S_IRUGO,	proc_ide_read_media,	NULL },
	{ "model",	S_IFREG|S_IRUGO,	proc_ide_read_dmodel,	NULL },
	{ "settings",	S_IFREG|S_IRUSR|S_IWUSR,proc_ide_read_settings,	proc_ide_write_settings },
	{ NULL,	0, NULL, NULL }
};

static void ide_add_proc_entries(struct proc_dir_entry *dir, ide_proc_entry_t *p, void *data)
{
	struct proc_dir_entry *ent;

	if (!dir || !p)
		return;
	while (p->name != NULL) {
		ent = create_proc_entry(p->name, p->mode, dir);
		if (!ent) return;
		ent->data = data;
		ent->read_proc = p->read_proc;
		ent->write_proc = p->write_proc;
		p++;
	}
}

static void ide_remove_proc_entries(struct proc_dir_entry *dir, ide_proc_entry_t *p)
{
	if (!dir || !p)
		return;
	while (p->name != NULL) {
		remove_proc_entry(p->name, dir);
		p++;
	}
}

void ide_proc_register_driver(ide_drive_t *drive, ide_driver_t *driver)
{
	ide_add_proc_entries(drive->proc, driver->proc, drive);
}

EXPORT_SYMBOL(ide_proc_register_driver);

/**
 *	ide_proc_unregister_driver	-	remove driver specific data
 *	@drive: drive
 *	@driver: driver
 *
 *	Clean up the driver specific /proc files and IDE settings
 *	for a given drive.
 *
 *	Takes ide_setting_mtx and ide_lock.
 *	Caller must hold none of the locks.
 */

void ide_proc_unregister_driver(ide_drive_t *drive, ide_driver_t *driver)
{
	unsigned long flags;

	ide_remove_proc_entries(drive->proc, driver->proc);

	mutex_lock(&ide_setting_mtx);
	spin_lock_irqsave(&ide_lock, flags);
	/*
	 * ide_setting_mtx protects the settings list
	 * ide_lock protects the use of settings
	 *
	 * so we need to hold both, ide_settings_sem because we want to
	 * modify the settings list, and ide_lock because we cannot take
	 * a setting out that is being used.
	 *
	 * OTOH both ide_{read,write}_setting are only ever used under
	 * ide_setting_mtx.
	 */
	auto_remove_settings(drive);
	spin_unlock_irqrestore(&ide_lock, flags);
	mutex_unlock(&ide_setting_mtx);
}

EXPORT_SYMBOL(ide_proc_unregister_driver);

static void create_proc_ide_drives(ide_hwif_t *hwif)
{
	int	d;
	struct proc_dir_entry *ent;
	struct proc_dir_entry *parent = hwif->proc;
	char name[64];

	for (d = 0; d < MAX_DRIVES; d++) {
		ide_drive_t *drive = &hwif->drives[d];

		if (!drive->present)
			continue;
		if (drive->proc)
			continue;

		drive->proc = proc_mkdir(drive->name, parent);
		if (drive->proc)
			ide_add_proc_entries(drive->proc, generic_drive_entries, drive);
		sprintf(name,"ide%d/%s", (drive->name[2]-'a')/2, drive->name);
		ent = proc_symlink(drive->name, proc_ide_root, name);
		if (!ent) return;
	}
}

static void destroy_proc_ide_device(ide_hwif_t *hwif, ide_drive_t *drive)
{
	if (drive->proc) {
		ide_remove_proc_entries(drive->proc, generic_drive_entries);
		remove_proc_entry(drive->name, proc_ide_root);
		remove_proc_entry(drive->name, hwif->proc);
		drive->proc = NULL;
	}
}

static void destroy_proc_ide_drives(ide_hwif_t *hwif)
{
	int	d;

	for (d = 0; d < MAX_DRIVES; d++) {
		ide_drive_t *drive = &hwif->drives[d];
		if (drive->proc)
			destroy_proc_ide_device(hwif, drive);
	}
}

static ide_proc_entry_t hwif_entries[] = {
	{ "channel",	S_IFREG|S_IRUGO,	proc_ide_read_channel,	NULL },
	{ "mate",	S_IFREG|S_IRUGO,	proc_ide_read_mate,	NULL },
	{ "model",	S_IFREG|S_IRUGO,	proc_ide_read_imodel,	NULL },
	{ NULL,	0, NULL, NULL }
};

void ide_proc_register_port(ide_hwif_t *hwif)
{
	if (!hwif->present)
		return;

	if (!hwif->proc) {
		hwif->proc = proc_mkdir(hwif->name, proc_ide_root);

		if (!hwif->proc)
			return;

		ide_add_proc_entries(hwif->proc, hwif_entries, hwif);
	}

	create_proc_ide_drives(hwif);
}

#ifdef CONFIG_BLK_DEV_IDEPCI
void ide_pci_create_host_proc(const char *name, get_info_t *get_info)
{
	create_proc_info_entry(name, 0, proc_ide_root, get_info);
}

EXPORT_SYMBOL_GPL(ide_pci_create_host_proc);
#endif

void ide_proc_unregister_port(ide_hwif_t *hwif)
{
	if (hwif->proc) {
		destroy_proc_ide_drives(hwif);
		ide_remove_proc_entries(hwif->proc, hwif_entries);
		remove_proc_entry(hwif->name, proc_ide_root);
		hwif->proc = NULL;
	}
}

static int proc_print_driver(struct device_driver *drv, void *data)
{
	ide_driver_t *ide_drv = container_of(drv, ide_driver_t, gen_driver);
	struct seq_file *s = data;

	seq_printf(s, "%s version %s\n", drv->name, ide_drv->version);

	return 0;
}

static int ide_drivers_show(struct seq_file *s, void *p)
{
	int err;

	err = bus_for_each_drv(&ide_bus_type, NULL, s, proc_print_driver);
	if (err < 0)
		printk(KERN_WARNING "IDE: %s: bus_for_each_drv error: %d\n",
			__FUNCTION__, err);
	return 0;
}

static int ide_drivers_open(struct inode *inode, struct file *file)
{
	return single_open(file, &ide_drivers_show, NULL);
}

static const struct file_operations ide_drivers_operations = {
	.open		= ide_drivers_open,
	.read		= seq_read,
	.llseek		= seq_lseek,
	.release	= single_release,
};

void proc_ide_create(void)
{
	struct proc_dir_entry *entry;

	proc_ide_root = proc_mkdir("ide", NULL);

	if (!proc_ide_root)
		return;

	entry = create_proc_entry("drivers", 0, proc_ide_root);
	if (entry)
		entry->proc_fops = &ide_drivers_operations;
}

void proc_ide_destroy(void)
{
	remove_proc_entry("drivers", proc_ide_root);
	remove_proc_entry("ide", NULL);
}