[BLOCK] Move all core block layer code to new block/ directory

drivers/block/ is right now a mix of core and driver parts. Lets move
the core parts to a new top level directory. Al will move the fs/
related block parts to block/ next.

Signed-off-by: Jens Axboe <axboe@suse.de>

1 files changed, 275 insertions, 0 deletions

diff --git a/block/ioctl.c b/block/ioctl.c
new file mode 100644
index 000000000000..6e278474f9a8
--- /dev/null
+++ b/block/ioctl.c
@@ -0,0 +1,275 @@
+#include <linux/sched.h>                /* for capable() */
+#include <linux/blkdev.h>
+#include <linux/blkpg.h>
+#include <linux/backing-dev.h>
+#include <linux/buffer_head.h>
+#include <linux/smp_lock.h>
+#include <asm/uaccess.h>
+
+static int blkpg_ioctl(struct block_device *bdev, struct blkpg_ioctl_arg __user *arg)
+{
+        struct block_device *bdevp;
+        struct gendisk *disk;
+        struct blkpg_ioctl_arg a;
+        struct blkpg_partition p;
+        long long start, length;
+        int part;
+        int i;
+
+        if (!capable(CAP_SYS_ADMIN))
+                return -EACCES;
+        if (copy_from_user(&a, arg, sizeof(struct blkpg_ioctl_arg)))
+                return -EFAULT;
+        if (copy_from_user(&p, a.data, sizeof(struct blkpg_partition)))
+                return -EFAULT;
+        disk = bdev->bd_disk;
+        if (bdev != bdev->bd_contains)
+                return -EINVAL;
+        part = p.pno;
+        if (part <= 0 || part >= disk->minors)
+                return -EINVAL;
+        switch (a.op) {
+                case BLKPG_ADD_PARTITION:
+                        start = p.start >> 9;
+                        length = p.length >> 9;
+                        /* check for fit in a hd_struct */ 
+                        if (sizeof(sector_t) == sizeof(long) && 
+                            sizeof(long long) > sizeof(long)) {
+                                long pstart = start, plength = length;
+                                if (pstart != start || plength != length
+                                    || pstart < 0 || plength < 0)
+                                        return -EINVAL;
+                        }
+                        /* partition number in use? */
+                        down(&bdev->bd_sem);
+                        if (disk->part[part - 1]) {
+                                up(&bdev->bd_sem);
+                                return -EBUSY;
+                        }
+                        /* overlap? */
+                        for (i = 0; i < disk->minors - 1; i++) {
+                                struct hd_struct *s = disk->part[i];
+
+                                if (!s)
+                                        continue;
+                                if (!(start+length <= s->start_sect ||
+                                      start >= s->start_sect + s->nr_sects)) {
+                                        up(&bdev->bd_sem);
+                                        return -EBUSY;
+                                }
+                        }
+                        /* all seems OK */
+                        add_partition(disk, part, start, length);
+                        up(&bdev->bd_sem);
+                        return 0;
+                case BLKPG_DEL_PARTITION:
+                        if (!disk->part[part-1])
+                                return -ENXIO;
+                        if (disk->part[part - 1]->nr_sects == 0)
+                                return -ENXIO;
+                        bdevp = bdget_disk(disk, part);
+                        if (!bdevp)
+                                return -ENOMEM;
+                        down(&bdevp->bd_sem);
+                        if (bdevp->bd_openers) {
+                                up(&bdevp->bd_sem);
+                                bdput(bdevp);
+                                return -EBUSY;
+                        }
+                        /* all seems OK */
+                        fsync_bdev(bdevp);
+                        invalidate_bdev(bdevp, 0);
+
+                        down(&bdev->bd_sem);
+                        delete_partition(disk, part);
+                        up(&bdev->bd_sem);
+                        up(&bdevp->bd_sem);
+                        bdput(bdevp);
+
+                        return 0;
+                default:
+                        return -EINVAL;
+        }
+}
+
+static int blkdev_reread_part(struct block_device *bdev)
+{
+        struct gendisk *disk = bdev->bd_disk;
+        int res;
+
+        if (disk->minors == 1 || bdev != bdev->bd_contains)
+                return -EINVAL;
+        if (!capable(CAP_SYS_ADMIN))
+                return -EACCES;
+        if (down_trylock(&bdev->bd_sem))
+                return -EBUSY;
+        res = rescan_partitions(disk, bdev);
+        up(&bdev->bd_sem);
+        return res;
+}
+
+static int put_ushort(unsigned long arg, unsigned short val)
+{
+        return put_user(val, (unsigned short __user *)arg);
+}
+
+static int put_int(unsigned long arg, int val)
+{
+        return put_user(val, (int __user *)arg);
+}
+
+static int put_long(unsigned long arg, long val)
+{
+        return put_user(val, (long __user *)arg);
+}
+
+static int put_ulong(unsigned long arg, unsigned long val)
+{
+        return put_user(val, (unsigned long __user *)arg);
+}
+
+static int put_u64(unsigned long arg, u64 val)
+{
+        return put_user(val, (u64 __user *)arg);
+}
+
+static int blkdev_locked_ioctl(struct file *file, struct block_device *bdev,
+                                unsigned cmd, unsigned long arg)
+{
+        struct backing_dev_info *bdi;
+        int ret, n;
+
+        switch (cmd) {
+        case BLKRAGET:
+        case BLKFRAGET:
+                if (!arg)
+                        return -EINVAL;
+                bdi = blk_get_backing_dev_info(bdev);
+                if (bdi == NULL)
+                        return -ENOTTY;
+                return put_long(arg, (bdi->ra_pages * PAGE_CACHE_SIZE) / 512);
+        case BLKROGET:
+                return put_int(arg, bdev_read_only(bdev) != 0);
+        case BLKBSZGET: /* get the logical block size (cf. BLKSSZGET) */
+                return put_int(arg, block_size(bdev));
+        case BLKSSZGET: /* get block device hardware sector size */
+                return put_int(arg, bdev_hardsect_size(bdev));
+        case BLKSECTGET:
+                return put_ushort(arg, bdev_get_queue(bdev)->max_sectors);
+        case BLKRASET:
+        case BLKFRASET:
+                if(!capable(CAP_SYS_ADMIN))
+                        return -EACCES;
+                bdi = blk_get_backing_dev_info(bdev);
+                if (bdi == NULL)
+                        return -ENOTTY;
+                bdi->ra_pages = (arg * 512) / PAGE_CACHE_SIZE;
+                return 0;
+        case BLKBSZSET:
+                /* set the logical block size */
+                if (!capable(CAP_SYS_ADMIN))
+                        return -EACCES;
+                if (!arg)
+                        return -EINVAL;
+                if (get_user(n, (int __user *) arg))
+                        return -EFAULT;
+                if (bd_claim(bdev, file) < 0)
+                        return -EBUSY;
+                ret = set_blocksize(bdev, n);
+                bd_release(bdev);
+                return ret;
+        case BLKPG:
+                return blkpg_ioctl(bdev, (struct blkpg_ioctl_arg __user *) arg);
+        case BLKRRPART:
+                return blkdev_reread_part(bdev);
+        case BLKGETSIZE:
+                if ((bdev->bd_inode->i_size >> 9) > ~0UL)
+                        return -EFBIG;
+                return put_ulong(arg, bdev->bd_inode->i_size >> 9);
+        case BLKGETSIZE64:
+                return put_u64(arg, bdev->bd_inode->i_size);
+        }
+        return -ENOIOCTLCMD;
+}
+
+static int blkdev_driver_ioctl(struct inode *inode, struct file *file,
+                struct gendisk *disk, unsigned cmd, unsigned long arg)
+{
+        int ret;
+        if (disk->fops->unlocked_ioctl)
+                return disk->fops->unlocked_ioctl(file, cmd, arg);
+
+        if (disk->fops->ioctl) {
+                lock_kernel();
+                ret = disk->fops->ioctl(inode, file, cmd, arg);
+                unlock_kernel();
+                return ret;
+        }
+
+        return -ENOTTY;
+}
+
+int blkdev_ioctl(struct inode *inode, struct file *file, unsigned cmd,
+                        unsigned long arg)
+{
+        struct block_device *bdev = inode->i_bdev;
+        struct gendisk *disk = bdev->bd_disk;
+        int ret, n;
+
+        switch(cmd) {
+        case BLKFLSBUF:
+                if (!capable(CAP_SYS_ADMIN))
+                        return -EACCES;
+
+                ret = blkdev_driver_ioctl(inode, file, disk, cmd, arg);
+                /* -EINVAL to handle old uncorrected drivers */
+                if (ret != -EINVAL && ret != -ENOTTY)
+                        return ret;
+
+                lock_kernel();
+                fsync_bdev(bdev);
+                invalidate_bdev(bdev, 0);
+                unlock_kernel();
+                return 0;
+
+        case BLKROSET:
+                ret = blkdev_driver_ioctl(inode, file, disk, cmd, arg);
+                /* -EINVAL to handle old uncorrected drivers */
+                if (ret != -EINVAL && ret != -ENOTTY)
+                        return ret;
+                if (!capable(CAP_SYS_ADMIN))
+                        return -EACCES;
+                if (get_user(n, (int __user *)(arg)))
+                        return -EFAULT;
+                lock_kernel();
+                set_device_ro(bdev, n);
+                unlock_kernel();
+                return 0;
+        }
+
+        lock_kernel();
+        ret = blkdev_locked_ioctl(file, bdev, cmd, arg);
+        unlock_kernel();
+        if (ret != -ENOIOCTLCMD)
+                return ret;
+
+        return blkdev_driver_ioctl(inode, file, disk, cmd, arg);
+}
+
+/* Most of the generic ioctls are handled in the normal fallback path.
+   This assumes the blkdev's low level compat_ioctl always returns
+   ENOIOCTLCMD for unknown ioctls. */
+long compat_blkdev_ioctl(struct file *file, unsigned cmd, unsigned long arg)
+{
+        struct block_device *bdev = file->f_dentry->d_inode->i_bdev;
+        struct gendisk *disk = bdev->bd_disk;
+        int ret = -ENOIOCTLCMD;
+        if (disk->fops->compat_ioctl) {
+                lock_kernel();
+                ret = disk->fops->compat_ioctl(file, cmd, arg);
+                unlock_kernel();
+        }
+        return ret;
+}
+
+EXPORT_SYMBOL_GPL(blkdev_ioctl);