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yaml --- r: 66091 b: refs/heads/master c: f58c4c0 h: refs/heads/master i: 66089: 4883022 66087: 486787f v: v3
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Arnd Bergmann
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Jens Axboe
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Oct 10, 2007
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -1,2 +1,2 @@ | ||
| --- | ||
| refs/heads/master: d2bbf3da3759d04cd5836955cc59c8ae96092831 | ||
| refs/heads/master: f58c4c0a17e500e767473598b3deafaa1d64051d |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -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; | ||
| } |
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