[PATCH] s390: use normal switch statement for ioctls in dasd_ioctlc
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:
parent
61d3ad0edf
commit
13c6204fac
3 changed files with 86 additions and 161 deletions
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@ -1807,7 +1807,6 @@ dasd_exit(void)
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#ifdef CONFIG_PROC_FS
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#ifdef CONFIG_PROC_FS
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dasd_proc_exit();
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dasd_proc_exit();
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#endif
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#endif
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dasd_ioctl_exit();
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if (dasd_page_cache != NULL) {
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if (dasd_page_cache != NULL) {
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kmem_cache_destroy(dasd_page_cache);
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kmem_cache_destroy(dasd_page_cache);
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dasd_page_cache = NULL;
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dasd_page_cache = NULL;
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@ -2093,9 +2092,6 @@ dasd_init(void)
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rc = dasd_parse();
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rc = dasd_parse();
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if (rc)
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if (rc)
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goto failed;
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goto failed;
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rc = dasd_ioctl_init();
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if (rc)
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goto failed;
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#ifdef CONFIG_PROC_FS
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#ifdef CONFIG_PROC_FS
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rc = dasd_proc_init();
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rc = dasd_proc_init();
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if (rc)
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if (rc)
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@ -523,8 +523,6 @@ int dasd_scan_partitions(struct dasd_device *);
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void dasd_destroy_partitions(struct dasd_device *);
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void dasd_destroy_partitions(struct dasd_device *);
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/* externals in dasd_ioctl.c */
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/* externals in dasd_ioctl.c */
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int dasd_ioctl_init(void);
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void dasd_ioctl_exit(void);
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int dasd_ioctl_no_register(struct module *, int, dasd_ioctl_fn_t);
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int dasd_ioctl_no_register(struct module *, int, dasd_ioctl_fn_t);
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int dasd_ioctl_no_unregister(struct module *, int, dasd_ioctl_fn_t);
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int dasd_ioctl_no_unregister(struct module *, int, dasd_ioctl_fn_t);
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int dasd_ioctl(struct inode *, struct file *, unsigned int, unsigned long);
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int dasd_ioctl(struct inode *, struct file *, unsigned int, unsigned long);
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@ -77,62 +77,11 @@ dasd_ioctl_no_unregister(struct module *owner, int no, dasd_ioctl_fn_t handler)
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return 0;
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return 0;
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}
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}
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int
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dasd_ioctl(struct inode *inp, struct file *filp,
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unsigned int no, unsigned long data)
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{
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struct block_device *bdev = inp->i_bdev;
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struct dasd_device *device = bdev->bd_disk->private_data;
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struct dasd_ioctl *ioctl;
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const char *dir;
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int rc;
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if ((_IOC_DIR(no) != _IOC_NONE) && (data == 0)) {
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PRINT_DEBUG("empty data ptr");
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return -EINVAL;
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}
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dir = _IOC_DIR (no) == _IOC_NONE ? "0" :
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_IOC_DIR (no) == _IOC_READ ? "r" :
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_IOC_DIR (no) == _IOC_WRITE ? "w" :
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_IOC_DIR (no) == (_IOC_READ | _IOC_WRITE) ? "rw" : "u";
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DBF_DEV_EVENT(DBF_DEBUG, device,
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"ioctl 0x%08x %s'0x%x'%d(%d) with data %8lx", no,
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dir, _IOC_TYPE(no), _IOC_NR(no), _IOC_SIZE(no), data);
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/* Search for ioctl no in the ioctl list. */
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list_for_each_entry(ioctl, &dasd_ioctl_list, list) {
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if (ioctl->no == no) {
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/* Found a matching ioctl. Call it. */
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if (!try_module_get(ioctl->owner))
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continue;
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rc = ioctl->handler(bdev, no, data);
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module_put(ioctl->owner);
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return rc;
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}
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}
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/* No ioctl with number no. */
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DBF_DEV_EVENT(DBF_INFO, device,
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"unknown ioctl 0x%08x=%s'0x%x'%d(%d) data %8lx", no,
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dir, _IOC_TYPE(no), _IOC_NR(no), _IOC_SIZE(no), data);
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return -EINVAL;
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}
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long
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dasd_compat_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
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{
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int rval;
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lock_kernel();
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rval = dasd_ioctl(filp->f_dentry->d_inode, filp, cmd, arg);
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unlock_kernel();
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return (rval == -EINVAL) ? -ENOIOCTLCMD : rval;
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}
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static int
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static int
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dasd_ioctl_api_version(struct block_device *bdev, int no, long args)
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dasd_ioctl_api_version(void __user *argp)
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{
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{
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int ver = DASD_API_VERSION;
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int ver = DASD_API_VERSION;
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return put_user(ver, (int __user *) args);
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return put_user(ver, (int *)argp);
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}
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}
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/*
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/*
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@ -140,15 +89,13 @@ dasd_ioctl_api_version(struct block_device *bdev, int no, long args)
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* used by dasdfmt after BIODASDDISABLE to retrigger blocksize detection
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* used by dasdfmt after BIODASDDISABLE to retrigger blocksize detection
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*/
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*/
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static int
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static int
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dasd_ioctl_enable(struct block_device *bdev, int no, long args)
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dasd_ioctl_enable(struct block_device *bdev)
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{
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{
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struct dasd_device *device;
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struct dasd_device *device = bdev->bd_disk->private_data;
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if (!capable(CAP_SYS_ADMIN))
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if (!capable(CAP_SYS_ADMIN))
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return -EACCES;
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return -EACCES;
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device = bdev->bd_disk->private_data;
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if (device == NULL)
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return -ENODEV;
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dasd_enable_device(device);
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dasd_enable_device(device);
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/* Formatting the dasd device can change the capacity. */
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/* Formatting the dasd device can change the capacity. */
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mutex_lock(&bdev->bd_mutex);
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mutex_lock(&bdev->bd_mutex);
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@ -162,15 +109,13 @@ dasd_ioctl_enable(struct block_device *bdev, int no, long args)
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* Used by dasdfmt. Disable I/O operations but allow ioctls.
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* Used by dasdfmt. Disable I/O operations but allow ioctls.
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*/
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*/
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static int
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static int
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dasd_ioctl_disable(struct block_device *bdev, int no, long args)
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dasd_ioctl_disable(struct block_device *bdev)
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{
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{
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struct dasd_device *device;
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struct dasd_device *device = bdev->bd_disk->private_data;
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if (!capable(CAP_SYS_ADMIN))
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if (!capable(CAP_SYS_ADMIN))
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return -EACCES;
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return -EACCES;
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device = bdev->bd_disk->private_data;
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if (device == NULL)
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return -ENODEV;
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/*
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/*
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* Man this is sick. We don't do a real disable but only downgrade
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* Man this is sick. We don't do a real disable but only downgrade
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* the device to DASD_STATE_BASIC. The reason is that dasdfmt uses
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* the device to DASD_STATE_BASIC. The reason is that dasdfmt uses
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@ -194,18 +139,13 @@ dasd_ioctl_disable(struct block_device *bdev, int no, long args)
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* Quiesce device.
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* Quiesce device.
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*/
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*/
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static int
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static int
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dasd_ioctl_quiesce(struct block_device *bdev, int no, long args)
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dasd_ioctl_quiesce(struct dasd_device *device)
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{
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{
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struct dasd_device *device;
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unsigned long flags;
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unsigned long flags;
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if (!capable (CAP_SYS_ADMIN))
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if (!capable (CAP_SYS_ADMIN))
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return -EACCES;
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return -EACCES;
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device = bdev->bd_disk->private_data;
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if (device == NULL)
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return -ENODEV;
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DEV_MESSAGE (KERN_DEBUG, device, "%s",
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DEV_MESSAGE (KERN_DEBUG, device, "%s",
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"Quiesce IO on device");
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"Quiesce IO on device");
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spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags);
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spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags);
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@ -219,18 +159,13 @@ dasd_ioctl_quiesce(struct block_device *bdev, int no, long args)
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* Quiesce device.
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* Quiesce device.
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*/
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*/
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static int
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static int
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dasd_ioctl_resume(struct block_device *bdev, int no, long args)
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dasd_ioctl_resume(struct dasd_device *device)
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{
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{
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struct dasd_device *device;
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unsigned long flags;
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unsigned long flags;
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if (!capable (CAP_SYS_ADMIN))
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if (!capable (CAP_SYS_ADMIN))
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return -EACCES;
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return -EACCES;
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device = bdev->bd_disk->private_data;
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if (device == NULL)
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return -ENODEV;
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DEV_MESSAGE (KERN_DEBUG, device, "%s",
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DEV_MESSAGE (KERN_DEBUG, device, "%s",
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"resume IO on device");
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"resume IO on device");
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@ -302,25 +237,19 @@ dasd_format(struct dasd_device * device, struct format_data_t * fdata)
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* Format device.
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* Format device.
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*/
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*/
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static int
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static int
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dasd_ioctl_format(struct block_device *bdev, int no, long args)
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dasd_ioctl_format(struct block_device *bdev, void __user *argp)
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{
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{
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struct dasd_device *device;
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struct dasd_device *device = bdev->bd_disk->private_data;
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struct format_data_t fdata;
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struct format_data_t fdata;
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if (!capable(CAP_SYS_ADMIN))
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if (!capable(CAP_SYS_ADMIN))
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return -EACCES;
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return -EACCES;
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if (!args)
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if (!argp)
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return -EINVAL;
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return -EINVAL;
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/* fdata == NULL is no longer a valid arg to dasd_format ! */
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device = bdev->bd_disk->private_data;
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if (device == NULL)
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return -ENODEV;
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if (device->features & DASD_FEATURE_READONLY)
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if (device->features & DASD_FEATURE_READONLY)
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return -EROFS;
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return -EROFS;
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if (copy_from_user(&fdata, (void __user *) args,
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if (copy_from_user(&fdata, argp, sizeof(struct format_data_t)))
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sizeof (struct format_data_t)))
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return -EFAULT;
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return -EFAULT;
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if (bdev != bdev->bd_contains) {
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if (bdev != bdev->bd_contains) {
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DEV_MESSAGE(KERN_WARNING, device, "%s",
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DEV_MESSAGE(KERN_WARNING, device, "%s",
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@ -335,17 +264,8 @@ dasd_ioctl_format(struct block_device *bdev, int no, long args)
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* Reset device profile information
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* Reset device profile information
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*/
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*/
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static int
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static int
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dasd_ioctl_reset_profile(struct block_device *bdev, int no, long args)
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dasd_ioctl_reset_profile(struct dasd_device *device)
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{
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{
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struct dasd_device *device;
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if (!capable(CAP_SYS_ADMIN))
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return -EACCES;
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device = bdev->bd_disk->private_data;
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if (device == NULL)
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return -ENODEV;
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memset(&device->profile, 0, sizeof (struct dasd_profile_info_t));
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memset(&device->profile, 0, sizeof (struct dasd_profile_info_t));
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return 0;
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return 0;
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}
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}
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@ -354,31 +274,24 @@ dasd_ioctl_reset_profile(struct block_device *bdev, int no, long args)
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* Return device profile information
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* Return device profile information
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*/
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*/
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static int
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static int
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dasd_ioctl_read_profile(struct block_device *bdev, int no, long args)
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dasd_ioctl_read_profile(struct dasd_device *device, void __user *argp)
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{
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{
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struct dasd_device *device;
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device = bdev->bd_disk->private_data;
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if (device == NULL)
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return -ENODEV;
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if (dasd_profile_level == DASD_PROFILE_OFF)
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if (dasd_profile_level == DASD_PROFILE_OFF)
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return -EIO;
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return -EIO;
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if (copy_to_user(argp, &device->profile,
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if (copy_to_user((long __user *) args, (long *) &device->profile,
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sizeof (struct dasd_profile_info_t)))
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sizeof (struct dasd_profile_info_t)))
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return -EFAULT;
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return -EFAULT;
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return 0;
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return 0;
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}
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}
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#else
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#else
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static int
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static int
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dasd_ioctl_reset_profile(struct block_device *bdev, int no, long args)
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dasd_ioctl_reset_profile(struct dasd_device *device)
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{
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{
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return -ENOSYS;
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return -ENOSYS;
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}
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}
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static int
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static int
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dasd_ioctl_read_profile(struct block_device *bdev, int no, long args)
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dasd_ioctl_read_profile(struct dasd_device *device, void __user *argp)
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{
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{
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return -ENOSYS;
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return -ENOSYS;
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}
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}
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* Return dasd information. Used for BIODASDINFO and BIODASDINFO2.
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* Return dasd information. Used for BIODASDINFO and BIODASDINFO2.
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*/
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*/
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static int
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static int
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dasd_ioctl_information(struct block_device *bdev, int no, long args)
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dasd_ioctl_information(struct dasd_device *device,
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unsigned int cmd, void __user *argp)
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{
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{
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struct dasd_device *device;
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struct dasd_information2_t *dasd_info;
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struct dasd_information2_t *dasd_info;
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unsigned long flags;
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unsigned long flags;
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int rc;
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int rc;
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struct ccw_device *cdev;
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struct ccw_device *cdev;
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device = bdev->bd_disk->private_data;
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if (device == NULL)
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return -ENODEV;
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if (!device->discipline->fill_info)
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if (!device->discipline->fill_info)
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return -EINVAL;
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return -EINVAL;
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@ -467,8 +376,8 @@ dasd_ioctl_information(struct block_device *bdev, int no, long args)
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}
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}
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rc = 0;
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rc = 0;
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if (copy_to_user((long __user *) args, (long *) dasd_info,
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if (copy_to_user(argp, dasd_info,
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((no == (unsigned int) BIODASDINFO2) ?
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((cmd == (unsigned int) BIODASDINFO2) ?
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sizeof (struct dasd_information2_t) :
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sizeof (struct dasd_information2_t) :
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sizeof (struct dasd_information_t))))
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sizeof (struct dasd_information_t))))
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rc = -EFAULT;
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rc = -EFAULT;
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@ -480,68 +389,90 @@ dasd_ioctl_information(struct block_device *bdev, int no, long args)
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* Set read only
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* Set read only
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*/
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*/
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static int
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static int
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dasd_ioctl_set_ro(struct block_device *bdev, int no, long args)
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dasd_ioctl_set_ro(struct block_device *bdev, void __user *argp)
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{
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{
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struct dasd_device *device;
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struct dasd_device *device = bdev->bd_disk->private_data;
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int intval, rc;
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int intval;
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if (!capable(CAP_SYS_ADMIN))
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if (!capable(CAP_SYS_ADMIN))
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return -EACCES;
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return -EACCES;
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if (bdev != bdev->bd_contains)
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if (bdev != bdev->bd_contains)
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// ro setting is not allowed for partitions
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// ro setting is not allowed for partitions
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return -EINVAL;
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return -EINVAL;
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if (get_user(intval, (int __user *) args))
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if (get_user(intval, (int *)argp))
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return -EFAULT;
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return -EFAULT;
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device = bdev->bd_disk->private_data;
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if (device == NULL)
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return -ENODEV;
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set_disk_ro(bdev->bd_disk, intval);
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set_disk_ro(bdev->bd_disk, intval);
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rc = dasd_set_feature(device->cdev, DASD_FEATURE_READONLY, intval);
|
return dasd_set_feature(device->cdev, DASD_FEATURE_READONLY, intval);
|
||||||
|
|
||||||
return rc;
|
|
||||||
}
|
}
|
||||||
|
|
||||||
/*
|
|
||||||
* 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
|
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++)
|
if (!device)
|
||||||
dasd_ioctl_no_register(NULL, dasd_ioctls[i].no,
|
return -ENODEV;
|
||||||
dasd_ioctls[i].fn);
|
|
||||||
return 0;
|
|
||||||
|
|
||||||
|
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
|
long
|
||||||
dasd_ioctl_exit(void)
|
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++)
|
lock_kernel();
|
||||||
dasd_ioctl_no_unregister(NULL, dasd_ioctls[i].no,
|
rval = dasd_ioctl(filp->f_dentry->d_inode, filp, cmd, arg);
|
||||||
dasd_ioctls[i].fn);
|
unlock_kernel();
|
||||||
|
|
||||||
|
return (rval == -EINVAL) ? -ENOIOCTLCMD : rval;
|
||||||
}
|
}
|
||||||
|
|
||||||
EXPORT_SYMBOL(dasd_ioctl_no_register);
|
EXPORT_SYMBOL(dasd_ioctl_no_register);
|
||||||
|
|
Loading…
Reference in a new issue