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authorMartin K. Petersen <martin.petersen@oracle.com>2012-09-18 12:19:29 -0400
committerJens Axboe <axboe@kernel.dk>2012-09-20 14:31:53 +0200
commit66ba32dc167202c3cf8c86806581a9393ec7f488 (patch)
tree61bc596fd84f48a47a28a593435b437371607d6f
parent579e8f3c7b2ecf7db91398d942d76457a3ddba21 (diff)
downloadlinaro-lsk-66ba32dc167202c3cf8c86806581a9393ec7f488.tar.gz
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>
-rw-r--r--block/ioctl.c27
-rw-r--r--include/linux/fs.h1
2 files changed, 28 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,
return blkdev_issue_discard(bdev, start, len, GFP_KERNEL, flags);
}
+static int blk_ioctl_zeroout(struct block_device *bdev, uint64_t start,
+ uint64_t len)
+{
+ if (start & 511)
+ return -EINVAL;
+ if (len & 511)
+ return -EINVAL;
+ start >>= 9;
+ len >>= 9;
+
+ if (start + len > (i_size_read(bdev->bd_inode) >> 9))
+ return -EINVAL;
+
+ return blkdev_issue_zeroout(bdev, start, len, GFP_KERNEL);
+}
+
static int put_ushort(unsigned long arg, unsigned short val)
{
return put_user(val, (unsigned short __user *)arg);
@@ -300,6 +316,17 @@ int blkdev_ioctl(struct block_device *bdev, fmode_t mode, unsigned cmd,
return blk_ioctl_discard(bdev, range[0], range[1],
cmd == BLKSECDISCARD);
}
+ case BLKZEROOUT: {
+ uint64_t range[2];
+
+ if (!(mode & FMODE_WRITE))
+ return -EBADF;
+
+ if (copy_from_user(range, (void __user *)arg, sizeof(range)))
+ return -EFAULT;
+
+ return blk_ioctl_zeroout(bdev, range[0], range[1]);
+ }
case HDIO_GETGEO: {
struct hd_geometry geo;
diff --git a/include/linux/fs.h b/include/linux/fs.h
index aa110476a95..bd6f6e7ca48 100644
--- a/include/linux/fs.h
+++ b/include/linux/fs.h
@@ -335,6 +335,7 @@ struct inodes_stat_t {
#define BLKDISCARDZEROES _IO(0x12,124)
#define BLKSECDISCARD _IO(0x12,125)
#define BLKROTATIONAL _IO(0x12,126)
+#define BLKZEROOUT _IO(0x12,127)
#define BMAP_IOCTL 1 /* obsolete - kept for compatibility */
#define FIBMAP _IO(0x00,1) /* bmap access */