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authorArnd Bergmann <arnd@arndb.de>2007-10-09 13:23:51 +0200
committerJens Axboe <axboe@carl.home.kernel.dk>2007-10-10 09:26:00 +0200
commitf58c4c0a17e500e767473598b3deafaa1d64051d (patch)
treef8fbf3a2ce10a9fccf41f2f96bca1ca71b3dd77e /block
parentd2bbf3da3759d04cd5836955cc59c8ae96092831 (diff)
downloadlinux-2.6.34-ux500-f58c4c0a17e500e767473598b3deafaa1d64051d.tar.gz
compat_ioctl: move common block ioctls to compat_blkdev_ioctl
Make compat_blkdev_ioctl and blkdev_ioctl reflect the respective native versions. This is somewhat more efficient and makes it easier to keep the two in sync. Also get rid of the bogus handling for broken_blkgetsize and the duplicate entry for BLKRASET. Signed-off-by: Arnd Bergmann <arnd@arndb.de> Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
Diffstat (limited to 'block')
-rw-r--r--block/Makefile1
-rw-r--r--block/compat_ioctl.c121
-rw-r--r--block/ioctl.c21
3 files changed, 126 insertions, 17 deletions
diff --git a/block/Makefile b/block/Makefile
index 959feeb253b..3cfe7cebaa6 100644
--- a/block/Makefile
+++ b/block/Makefile
@@ -11,3 +11,4 @@ obj-$(CONFIG_IOSCHED_DEADLINE) += deadline-iosched.o
obj-$(CONFIG_IOSCHED_CFQ) += cfq-iosched.o
obj-$(CONFIG_BLK_DEV_IO_TRACE) += blktrace.o
+obj-$(CONFIG_COMPAT) += compat_ioctl.o
diff --git a/block/compat_ioctl.c b/block/compat_ioctl.c
new file mode 100644
index 00000000000..d20fdb436f6
--- /dev/null
+++ b/block/compat_ioctl.c
@@ -0,0 +1,121 @@
+#include <linux/blkdev.h>
+#include <linux/blkpg.h>
+#include <linux/blktrace_api.h>
+#include <linux/cdrom.h>
+#include <linux/compat.h>
+#include <linux/elevator.h>
+#include <linux/fd.h>
+#include <linux/hdreg.h>
+#include <linux/syscalls.h>
+#include <linux/smp_lock.h>
+#include <linux/types.h>
+#include <linux/uaccess.h>
+
+static int compat_put_ushort(unsigned long arg, unsigned short val)
+{
+ return put_user(val, (unsigned short __user *)compat_ptr(arg));
+}
+
+static int compat_put_int(unsigned long arg, int val)
+{
+ return put_user(val, (compat_int_t __user *)compat_ptr(arg));
+}
+
+static int compat_put_long(unsigned long arg, long val)
+{
+ return put_user(val, (compat_long_t __user *)compat_ptr(arg));
+}
+
+static int compat_put_ulong(unsigned long arg, compat_ulong_t val)
+{
+ return put_user(val, (compat_ulong_t __user *)compat_ptr(arg));
+}
+
+static int compat_put_u64(unsigned long arg, u64 val)
+{
+ return put_user(val, (compat_u64 __user *)compat_ptr(arg));
+}
+
+#define BLKBSZGET_32 _IOR(0x12, 112, int)
+#define BLKBSZSET_32 _IOW(0x12, 113, int)
+#define BLKGETSIZE64_32 _IOR(0x12, 114, int)
+
+static int compat_blkdev_locked_ioctl(struct inode *inode, struct file *file,
+ struct block_device *bdev,
+ unsigned cmd, unsigned long arg)
+{
+ struct backing_dev_info *bdi;
+
+ switch (cmd) {
+ case BLKRAGET:
+ case BLKFRAGET:
+ if (!arg)
+ return -EINVAL;
+ bdi = blk_get_backing_dev_info(bdev);
+ if (bdi == NULL)
+ return -ENOTTY;
+ return compat_put_long(arg,
+ (bdi->ra_pages * PAGE_CACHE_SIZE) / 512);
+ case BLKROGET: /* compatible */
+ return compat_put_int(arg, bdev_read_only(bdev) != 0);
+ case BLKBSZGET_32: /* get the logical block size (cf. BLKSSZGET) */
+ return compat_put_int(arg, block_size(bdev));
+ case BLKSSZGET: /* get block device hardware sector size */
+ return compat_put_int(arg, bdev_hardsect_size(bdev));
+ case BLKSECTGET:
+ return compat_put_ushort(arg,
+ bdev_get_queue(bdev)->max_sectors);
+ case BLKRASET: /* compatible, but no compat_ptr (!) */
+ 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 BLKGETSIZE:
+ if ((bdev->bd_inode->i_size >> 9) > ~0UL)
+ return -EFBIG;
+ return compat_put_ulong(arg, bdev->bd_inode->i_size >> 9);
+
+ case BLKGETSIZE64_32:
+ return compat_put_u64(arg, bdev->bd_inode->i_size);
+ }
+ return -ENOIOCTLCMD;
+}
+
+/* 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)
+{
+ int ret = -ENOIOCTLCMD;
+ struct inode *inode = file->f_mapping->host;
+ struct block_device *bdev = inode->i_bdev;
+ struct gendisk *disk = bdev->bd_disk;
+
+ switch (cmd) {
+ case BLKFLSBUF:
+ case BLKROSET:
+ /*
+ * the ones below are implemented in blkdev_locked_ioctl,
+ * but we call blkdev_ioctl, which gets the lock for us
+ */
+ case BLKRRPART:
+ return blkdev_ioctl(inode, file, cmd,
+ (unsigned long)compat_ptr(arg));
+ case BLKBSZSET_32:
+ return blkdev_ioctl(inode, file, BLKBSZSET,
+ (unsigned long)compat_ptr(arg));
+ }
+
+ lock_kernel();
+ ret = compat_blkdev_locked_ioctl(inode, file, bdev, cmd, arg);
+ /* FIXME: why do we assume -> compat_ioctl needs the BKL? */
+ if (ret == -ENOIOCTLCMD && disk->fops->compat_ioctl)
+ ret = disk->fops->compat_ioctl(file, cmd, arg);
+ unlock_kernel();
+
+ return ret;
+}
diff --git a/block/ioctl.c b/block/ioctl.c
index f7e3e8abf88..52d6385216a 100644
--- a/block/ioctl.c
+++ b/block/ioctl.c
@@ -217,6 +217,10 @@ int blkdev_driver_ioctl(struct inode *inode, struct file *file,
}
EXPORT_SYMBOL_GPL(blkdev_driver_ioctl);
+/*
+ * always keep this in sync with compat_blkdev_ioctl() and
+ * compat_blkdev_locked_ioctl()
+ */
int blkdev_ioctl(struct inode *inode, struct file *file, unsigned cmd,
unsigned long arg)
{
@@ -284,21 +288,4 @@ int blkdev_ioctl(struct inode *inode, struct file *file, unsigned cmd,
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_path.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);