aboutsummaryrefslogtreecommitdiffstats
diff options
context:
space:
mode:
authorMartin K. Petersen2012-09-18 11:19:29 -0500
committerJens Axboe2012-09-20 07:31:53 -0500
commit66ba32dc167202c3cf8c86806581a9393ec7f488 (patch)
tree61bc596fd84f48a47a28a593435b437371607d6f /block/ioctl.c
parent579e8f3c7b2ecf7db91398d942d76457a3ddba21 (diff)
downloadkernel-common-66ba32dc167202c3cf8c86806581a9393ec7f488.tar.gz
kernel-common-66ba32dc167202c3cf8c86806581a9393ec7f488.tar.xz
kernel-common-66ba32dc167202c3cf8c86806581a9393ec7f488.zip
block: ioctl to zero block ranges
Introduce a BLKZEROOUT ioctl which can be used to clear block ranges by way of blkdev_issue_zeroout(). Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com> Acked-by: Mike Snitzer <snitzer@redhat.com> Signed-off-by: Jens Axboe <axboe@kernel.dk>
Diffstat (limited to 'block/ioctl.c')
-rw-r--r--block/ioctl.c27
1 files changed, 27 insertions, 0 deletions
diff --git a/block/ioctl.c b/block/ioctl.c
index 4476e0e85d1..769d2960c0a 100644
--- a/block/ioctl.c
+++ b/block/ioctl.c
@@ -185,6 +185,22 @@ static int blk_ioctl_discard(struct block_device *bdev, uint64_t start,
185 return blkdev_issue_discard(bdev, start, len, GFP_KERNEL, flags); 185 return blkdev_issue_discard(bdev, start, len, GFP_KERNEL, flags);
186} 186}
187 187
188static int blk_ioctl_zeroout(struct block_device *bdev, uint64_t start,
189 uint64_t len)
190{
191 if (start & 511)
192 return -EINVAL;
193 if (len & 511)
194 return -EINVAL;
195 start >>= 9;
196 len >>= 9;
197
198 if (start + len > (i_size_read(bdev->bd_inode) >> 9))
199 return -EINVAL;
200
201 return blkdev_issue_zeroout(bdev, start, len, GFP_KERNEL);
202}
203
188static int put_ushort(unsigned long arg, unsigned short val) 204static int put_ushort(unsigned long arg, unsigned short val)
189{ 205{
190 return put_user(val, (unsigned short __user *)arg); 206 return put_user(val, (unsigned short __user *)arg);
@@ -300,6 +316,17 @@ int blkdev_ioctl(struct block_device *bdev, fmode_t mode, unsigned cmd,
300 return blk_ioctl_discard(bdev, range[0], range[1], 316 return blk_ioctl_discard(bdev, range[0], range[1],
301 cmd == BLKSECDISCARD); 317 cmd == BLKSECDISCARD);
302 } 318 }
319 case BLKZEROOUT: {
320 uint64_t range[2];
321
322 if (!(mode & FMODE_WRITE))
323 return -EBADF;
324
325 if (copy_from_user(range, (void __user *)arg, sizeof(range)))
326 return -EFAULT;
327
328 return blk_ioctl_zeroout(bdev, range[0], range[1]);
329 }
303 330
304 case HDIO_GETGEO: { 331 case HDIO_GETGEO: {
305 struct hd_geometry geo; 332 struct hd_geometry geo;