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[PATCH] s390: use normal switch statement for ioctls in dasd_ioctlc

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Handle ioctls implemented in dasd_ioctl through the normal switch statement
that most drivers use instead of the awkward dasd_ioctl_no_register routine.
This avoids searching a linear list on every call to dasd_ioctl(), and allows
to give the various ioctl implementation functions sane prototypes, aswell as
moving the check for bdev->bd_disk->private_data from the individual functions
to dasd_ioctl.  (I think it can't actually every be NULL, but let's keep that
for later)

Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Christoph Hellwig 2006-03-24 03:15:19 -08:00 committed by Linus Torvalds
parent 61d3ad0edf
commit 13c6204fac
3 changed files with 86 additions and 161 deletions
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4
drivers/s390/block/dasd.c
View file

@ -1807,7 +1807,6 @@ dasd_exit(void)
#ifdef CONFIG_PROC_FS
dasd_proc_exit();
#endif
dasd_ioctl_exit();
if (dasd_page_cache != NULL) {
kmem_cache_destroy(dasd_page_cache);
dasd_page_cache = NULL;
@ -2093,9 +2092,6 @@ dasd_init(void)
rc = dasd_parse();
if (rc)
goto failed;
rc = dasd_ioctl_init();
if (rc)
goto failed;
#ifdef CONFIG_PROC_FS
rc = dasd_proc_init();
if (rc)

2
drivers/s390/block/dasd_int.h
View file

@ -523,8 +523,6 @@ int dasd_scan_partitions(struct dasd_device *);
void dasd_destroy_partitions(struct dasd_device *);
/* externals in dasd_ioctl.c */
int dasd_ioctl_init(void);
void dasd_ioctl_exit(void);
int dasd_ioctl_no_register(struct module *, int, dasd_ioctl_fn_t);
int dasd_ioctl_no_unregister(struct module *, int, dasd_ioctl_fn_t);
int dasd_ioctl(struct inode *, struct file *, unsigned int, unsigned long);

241
drivers/s390/block/dasd_ioctl.c
View file

@ -77,62 +77,11 @@ dasd_ioctl_no_unregister(struct module *owner, int no, dasd_ioctl_fn_t handler)
return 0;
}
int
dasd_ioctl(struct inode *inp, struct file *filp,
unsigned int no, unsigned long data)
{
struct block_device *bdev = inp->i_bdev;
struct dasd_device *device = bdev->bd_disk->private_data;
struct dasd_ioctl *ioctl;
const char *dir;
int rc;
if ((_IOC_DIR(no) != _IOC_NONE) && (data == 0)) {
PRINT_DEBUG("empty data ptr");
return -EINVAL;
}
dir = _IOC_DIR (no) == _IOC_NONE ? "0" :
_IOC_DIR (no) == _IOC_READ ? "r" :
_IOC_DIR (no) == _IOC_WRITE ? "w" :
_IOC_DIR (no) == (_IOC_READ | _IOC_WRITE) ? "rw" : "u";
DBF_DEV_EVENT(DBF_DEBUG, device,
"ioctl 0x%08x %s'0x%x'%d(%d) with data %8lx", no,
dir, _IOC_TYPE(no), _IOC_NR(no), _IOC_SIZE(no), data);
/* Search for ioctl no in the ioctl list. */
list_for_each_entry(ioctl, &dasd_ioctl_list, list) {
if (ioctl->no == no) {
/* Found a matching ioctl. Call it. */
if (!try_module_get(ioctl->owner))
continue;
rc = ioctl->handler(bdev, no, data);
module_put(ioctl->owner);
return rc;
}
}
/* No ioctl with number no. */
DBF_DEV_EVENT(DBF_INFO, device,
"unknown ioctl 0x%08x=%s'0x%x'%d(%d) data %8lx", no,
dir, _IOC_TYPE(no), _IOC_NR(no), _IOC_SIZE(no), data);
return -EINVAL;
}
long
dasd_compat_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
{
int rval;
lock_kernel();
rval = dasd_ioctl(filp->f_dentry->d_inode, filp, cmd, arg);
unlock_kernel();
return (rval == -EINVAL) ? -ENOIOCTLCMD : rval;
}
static int
dasd_ioctl_api_version(struct block_device *bdev, int no, long args)
dasd_ioctl_api_version(void __user *argp)
{
int ver = DASD_API_VERSION;
return put_user(ver, (int __user *) args);
return put_user(ver, (int *)argp);
}
/*
@ -140,15 +89,13 @@ dasd_ioctl_api_version(struct block_device *bdev, int no, long args)
* used by dasdfmt after BIODASDDISABLE to retrigger blocksize detection
*/
static int
dasd_ioctl_enable(struct block_device *bdev, int no, long args)
dasd_ioctl_enable(struct block_device *bdev)
{
struct dasd_device *device;
struct dasd_device *device = bdev->bd_disk->private_data;
if (!capable(CAP_SYS_ADMIN))
return -EACCES;
device = bdev->bd_disk->private_data;
if (device == NULL)
return -ENODEV;
dasd_enable_device(device);
/* Formatting the dasd device can change the capacity. */
mutex_lock(&bdev->bd_mutex);
@ -162,15 +109,13 @@ dasd_ioctl_enable(struct block_device *bdev, int no, long args)
* Used by dasdfmt. Disable I/O operations but allow ioctls.
*/
static int
dasd_ioctl_disable(struct block_device *bdev, int no, long args)
dasd_ioctl_disable(struct block_device *bdev)
{
struct dasd_device *device;
struct dasd_device *device = bdev->bd_disk->private_data;
if (!capable(CAP_SYS_ADMIN))
return -EACCES;
device = bdev->bd_disk->private_data;
if (device == NULL)
return -ENODEV;
/*
* Man this is sick. We don't do a real disable but only downgrade
* the device to DASD_STATE_BASIC. The reason is that dasdfmt uses
@ -194,18 +139,13 @@ dasd_ioctl_disable(struct block_device *bdev, int no, long args)
* Quiesce device.
*/
static int
dasd_ioctl_quiesce(struct block_device *bdev, int no, long args)
dasd_ioctl_quiesce(struct dasd_device *device)
{
struct dasd_device *device;
unsigned long flags;
if (!capable (CAP_SYS_ADMIN))
return -EACCES;
device = bdev->bd_disk->private_data;
if (device == NULL)
return -ENODEV;
DEV_MESSAGE (KERN_DEBUG, device, "%s",
"Quiesce IO on device");
spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags);
@ -219,18 +159,13 @@ dasd_ioctl_quiesce(struct block_device *bdev, int no, long args)
* Quiesce device.
*/
static int
dasd_ioctl_resume(struct block_device *bdev, int no, long args)
dasd_ioctl_resume(struct dasd_device *device)
{
struct dasd_device *device;
unsigned long flags;
if (!capable (CAP_SYS_ADMIN))
return -EACCES;
device = bdev->bd_disk->private_data;
if (device == NULL)
return -ENODEV;
DEV_MESSAGE (KERN_DEBUG, device, "%s",
"resume IO on device");
@ -302,25 +237,19 @@ dasd_format(struct dasd_device * device, struct format_data_t * fdata)
* Format device.
*/
static int
dasd_ioctl_format(struct block_device *bdev, int no, long args)
dasd_ioctl_format(struct block_device *bdev, void __user *argp)
{
struct dasd_device *device;
struct dasd_device *device = bdev->bd_disk->private_data;
struct format_data_t fdata;
if (!capable(CAP_SYS_ADMIN))
return -EACCES;
if (!args)
if (!argp)
return -EINVAL;
/* fdata == NULL is no longer a valid arg to dasd_format ! */
device = bdev->bd_disk->private_data;
if (device == NULL)
return -ENODEV;
if (device->features & DASD_FEATURE_READONLY)
return -EROFS;
if (copy_from_user(&fdata, (void __user *) args,
sizeof (struct format_data_t)))
if (copy_from_user(&fdata, argp, sizeof(struct format_data_t)))
return -EFAULT;
if (bdev != bdev->bd_contains) {
DEV_MESSAGE(KERN_WARNING, device, "%s",
@ -335,17 +264,8 @@ dasd_ioctl_format(struct block_device *bdev, int no, long args)
* Reset device profile information
*/
static int
dasd_ioctl_reset_profile(struct block_device *bdev, int no, long args)
dasd_ioctl_reset_profile(struct dasd_device *device)
{
struct dasd_device *device;
if (!capable(CAP_SYS_ADMIN))
return -EACCES;
device = bdev->bd_disk->private_data;
if (device == NULL)
return -ENODEV;
memset(&device->profile, 0, sizeof (struct dasd_profile_info_t));
return 0;
}
@ -354,31 +274,24 @@ dasd_ioctl_reset_profile(struct block_device *bdev, int no, long args)
* Return device profile information
*/
static int
dasd_ioctl_read_profile(struct block_device *bdev, int no, long args)
dasd_ioctl_read_profile(struct dasd_device *device, void __user *argp)
{
struct dasd_device *device;
device = bdev->bd_disk->private_data;
if (device == NULL)
return -ENODEV;
if (dasd_profile_level == DASD_PROFILE_OFF)
return -EIO;
if (copy_to_user((long __user *) args, (long *) &device->profile,
if (copy_to_user(argp, &device->profile,
sizeof (struct dasd_profile_info_t)))
return -EFAULT;
return 0;
}
#else
static int
dasd_ioctl_reset_profile(struct block_device *bdev, int no, long args)
dasd_ioctl_reset_profile(struct dasd_device *device)
{
return -ENOSYS;
}
static int
dasd_ioctl_read_profile(struct block_device *bdev, int no, long args)
dasd_ioctl_read_profile(struct dasd_device *device, void __user *argp)
{
return -ENOSYS;
}
@ -388,18 +301,14 @@ dasd_ioctl_read_profile(struct block_device *bdev, int no, long args)
* Return dasd information. Used for BIODASDINFO and BIODASDINFO2.
*/
static int
dasd_ioctl_information(struct block_device *bdev, int no, long args)
dasd_ioctl_information(struct dasd_device *device,
unsigned int cmd, void __user *argp)
{
struct dasd_device *device;
struct dasd_information2_t *dasd_info;
unsigned long flags;
int rc;
struct ccw_device *cdev;
device = bdev->bd_disk->private_data;
if (device == NULL)
return -ENODEV;
if (!device->discipline->fill_info)
return -EINVAL;
@ -467,8 +376,8 @@ dasd_ioctl_information(struct block_device *bdev, int no, long args)
}
rc = 0;
if (copy_to_user((long __user *) args, (long *) dasd_info,
((no == (unsigned int) BIODASDINFO2) ?
if (copy_to_user(argp, dasd_info,
((cmd == (unsigned int) BIODASDINFO2) ?
sizeof (struct dasd_information2_t) :
sizeof (struct dasd_information_t))))
rc = -EFAULT;
@ -480,68 +389,90 @@ dasd_ioctl_information(struct block_device *bdev, int no, long args)
* Set read only
*/
static int
dasd_ioctl_set_ro(struct block_device *bdev, int no, long args)
dasd_ioctl_set_ro(struct block_device *bdev, void __user *argp)
{
struct dasd_device *device;
int intval, rc;
struct dasd_device *device = bdev->bd_disk->private_data;
int intval;
if (!capable(CAP_SYS_ADMIN))
return -EACCES;
if (bdev != bdev->bd_contains)
// ro setting is not allowed for partitions
return -EINVAL;
if (get_user(intval, (int __user *) args))
if (get_user(intval, (int *)argp))
return -EFAULT;
device = bdev->bd_disk->private_data;
if (device == NULL)
return -ENODEV;
set_disk_ro(bdev->bd_disk, intval);
rc = dasd_set_feature(device->cdev, DASD_FEATURE_READONLY, intval);
return rc;
return dasd_set_feature(device->cdev, DASD_FEATURE_READONLY, intval);
}
/*
* List of static ioctls.
*/
static struct { int no; dasd_ioctl_fn_t fn; } dasd_ioctls[] =
{
{ BIODASDDISABLE, dasd_ioctl_disable },
{ BIODASDENABLE, dasd_ioctl_enable },
{ BIODASDQUIESCE, dasd_ioctl_quiesce },
{ BIODASDRESUME, dasd_ioctl_resume },
{ BIODASDFMT, dasd_ioctl_format },
{ BIODASDINFO, dasd_ioctl_information },
{ BIODASDINFO2, dasd_ioctl_information },
{ BIODASDPRRD, dasd_ioctl_read_profile },
{ BIODASDPRRST, dasd_ioctl_reset_profile },
{ BLKROSET, dasd_ioctl_set_ro },
{ DASDAPIVER, dasd_ioctl_api_version },
{ -1, NULL }
};
int
dasd_ioctl_init(void)
dasd_ioctl(struct inode *inode, struct file *file,
unsigned int cmd, unsigned long arg)
{
int i;
struct block_device *bdev = inode->i_bdev;
struct dasd_device *device = bdev->bd_disk->private_data;
void __user *argp = (void __user *)arg;
struct dasd_ioctl *ioctl;
int rc;
for (i = 0; dasd_ioctls[i].no != -1; i++)
dasd_ioctl_no_register(NULL, dasd_ioctls[i].no,
dasd_ioctls[i].fn);
return 0;
if (!device)
return -ENODEV;
if ((_IOC_DIR(cmd) != _IOC_NONE) && !arg) {
PRINT_DEBUG("empty data ptr");
return -EINVAL;
}
switch (cmd) {
case BIODASDDISABLE:
return dasd_ioctl_disable(bdev);
case BIODASDENABLE:
return dasd_ioctl_enable(bdev);
case BIODASDQUIESCE:
return dasd_ioctl_quiesce(device);
case BIODASDRESUME:
return dasd_ioctl_resume(device);
case BIODASDFMT:
return dasd_ioctl_format(bdev, argp);
case BIODASDINFO:
return dasd_ioctl_information(device, cmd, argp);
case BIODASDINFO2:
return dasd_ioctl_information(device, cmd, argp);
case BIODASDPRRD:
return dasd_ioctl_read_profile(device, argp);
case BIODASDPRRST:
return dasd_ioctl_reset_profile(device);
case BLKROSET:
return dasd_ioctl_set_ro(bdev, argp);
case DASDAPIVER:
return dasd_ioctl_api_version(argp);
default:
/* resort to the deprecated dynamic ioctl list */
list_for_each_entry(ioctl, &dasd_ioctl_list, list) {
if (ioctl->no == cmd) {
/* Found a matching ioctl. Call it. */
if (!try_module_get(ioctl->owner))
continue;
rc = ioctl->handler(bdev, cmd, arg);
module_put(ioctl->owner);
return rc;
}
}
return -EINVAL;
}
}
void
dasd_ioctl_exit(void)
long
dasd_compat_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
{
int i;
int rval;
for (i = 0; dasd_ioctls[i].no != -1; i++)
dasd_ioctl_no_unregister(NULL, dasd_ioctls[i].no,
dasd_ioctls[i].fn);
lock_kernel();
rval = dasd_ioctl(filp->f_dentry->d_inode, filp, cmd, arg);
unlock_kernel();
return (rval == -EINVAL) ? -ENOIOCTLCMD : rval;
}
EXPORT_SYMBOL(dasd_ioctl_no_register);