Messages in this thread Patch in this message | | | Date | Wed, 30 Nov 2011 22:23:44 -0500 | From | Phillip Susi <> | Subject | [PATCH 2/2] Add BLKPG_GET_PARTITION operation |
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Add a new operation to the BLKPG ioctl to read the partition. This allows user space to find the current start and length of a partition without having to open the partition and use the long depreciated HDIO_GETGEO ioctl.
Signed-off-by: Phillip Susi <psusi@cfl.rr.com> - --- block/ioctl.c | 15 +++++++++++++++ include/linux/blkpg.h | 1 + 2 files changed, 16 insertions(+), 0 deletions(-)
diff --git a/block/ioctl.c b/block/ioctl.c index f97e6a4..3e92f0f 100644 - --- a/block/ioctl.c +++ b/block/ioctl.c @@ -139,6 +139,21 @@ static int blkpg_ioctl(struct block_device *bdev, struct blkpg_ioctl_arg __user disk_put_part(part); mutex_unlock(&bdev->bd_mutex); return 0; + case BLKPG_GET_PARTITION: + mutex_lock(&bdev->bd_mutex); + part = disk_get_part(disk, partno); + if (!part) + { + mutex_unlock(&bdev->bd_mutex); + return -ENXIO; + } + p.start = part->start_sect << 9; + p.length = part->nr_sects << 9; + disk_put_part(part); + mutex_unlock(&bdev->bd_mutex); + if (copy_to_user(a.data, &p, sizeof(struct blkpg_partition))) + return -EFAULT; + return 0; default: return -EINVAL; } diff --git a/include/linux/blkpg.h b/include/linux/blkpg.h index 103da38..26b1aef 100644 - --- a/include/linux/blkpg.h +++ b/include/linux/blkpg.h @@ -41,6 +41,7 @@ struct blkpg_ioctl_arg { #define BLKPG_ADD_PARTITION 1 #define BLKPG_DEL_PARTITION 2 #define BLKPG_RES_PARTITION 3 +#define BLKPG_GET_PARTITION 4 /* Sizes of name fields. Unused at present. */ #define BLKPG_DEVNAMELTH 64 - -- 1.7.5.4 -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.11 (GNU/Linux) Comment: Using GnuPG with Mozilla - http://enigmail.mozdev.org/ iEYEARECAAYFAk7W80AACgkQJ4UciIs+XuJHtQCgjsMlhoVgn2ZDOv2nJ2pJNM3j 0psAoIDeUgJKw+eCAeleFNAGuuHy+HBO =mBqW -----END PGP SIGNATURE-----
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