block: Topology ioctls
Not all users of the topology information want to use libblkid. Provide
the topology information through bdev ioctls.
Also clarify sector size comments for existing BLK ioctls.
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
diff --git a/block/compat_ioctl.c b/block/compat_ioctl.c
index 7865a34..9bd086c 100644
--- a/block/compat_ioctl.c
+++ b/block/compat_ioctl.c
@@ -21,6 +21,11 @@
return put_user(val, (compat_int_t __user *)compat_ptr(arg));
}
+static int compat_put_uint(unsigned long arg, unsigned int val)
+{
+ return put_user(val, (compat_uint_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));
@@ -734,6 +739,14 @@
switch (cmd) {
case HDIO_GETGEO:
return compat_hdio_getgeo(disk, bdev, compat_ptr(arg));
+ case BLKPBSZGET:
+ return compat_put_uint(arg, bdev_physical_block_size(bdev));
+ case BLKIOMIN:
+ return compat_put_uint(arg, bdev_io_min(bdev));
+ case BLKIOOPT:
+ return compat_put_uint(arg, bdev_io_opt(bdev));
+ case BLKALIGNOFF:
+ return compat_put_int(arg, bdev_alignment_offset(bdev));
case BLKFLSBUF:
case BLKROSET:
case BLKDISCARD:
diff --git a/block/ioctl.c b/block/ioctl.c
index d3e6b58..1f4d1de 100644
--- a/block/ioctl.c
+++ b/block/ioctl.c
@@ -138,6 +138,11 @@
return put_user(val, (int __user *)arg);
}
+static int put_uint(unsigned long arg, unsigned int val)
+{
+ return put_user(val, (unsigned int __user *)arg);
+}
+
static int put_long(unsigned long arg, long val)
{
return put_user(val, (long __user *)arg);
@@ -263,10 +268,18 @@
return put_long(arg, (bdi->ra_pages * PAGE_CACHE_SIZE) / 512);
case BLKROGET:
return put_int(arg, bdev_read_only(bdev) != 0);
- case BLKBSZGET: /* get the logical block size (cf. BLKSSZGET) */
+ case BLKBSZGET: /* get block device soft block size (cf. BLKSSZGET) */
return put_int(arg, block_size(bdev));
- case BLKSSZGET: /* get block device hardware sector size */
+ case BLKSSZGET: /* get block device logical block size */
return put_int(arg, bdev_logical_block_size(bdev));
+ case BLKPBSZGET: /* get block device physical block size */
+ return put_uint(arg, bdev_physical_block_size(bdev));
+ case BLKIOMIN:
+ return put_uint(arg, bdev_io_min(bdev));
+ case BLKIOOPT:
+ return put_uint(arg, bdev_io_opt(bdev));
+ case BLKALIGNOFF:
+ return put_int(arg, bdev_alignment_offset(bdev));
case BLKSECTGET:
return put_ushort(arg, queue_max_sectors(bdev_get_queue(bdev)));
case BLKRASET:
diff --git a/include/linux/blkdev.h b/include/linux/blkdev.h
index a732393..2511904 100644
--- a/include/linux/blkdev.h
+++ b/include/linux/blkdev.h
@@ -1081,25 +1081,37 @@
return q->limits.physical_block_size;
}
+static inline int bdev_physical_block_size(struct block_device *bdev)
+{
+ return queue_physical_block_size(bdev_get_queue(bdev));
+}
+
static inline unsigned int queue_io_min(struct request_queue *q)
{
return q->limits.io_min;
}
+static inline int bdev_io_min(struct block_device *bdev)
+{
+ return queue_io_min(bdev_get_queue(bdev));
+}
+
static inline unsigned int queue_io_opt(struct request_queue *q)
{
return q->limits.io_opt;
}
+static inline int bdev_io_opt(struct block_device *bdev)
+{
+ return queue_io_opt(bdev_get_queue(bdev));
+}
+
static inline int queue_alignment_offset(struct request_queue *q)
{
- if (q && q->limits.misaligned)
+ if (q->limits.misaligned)
return -1;
- if (q && q->limits.alignment_offset)
- return q->limits.alignment_offset;
-
- return 0;
+ return q->limits.alignment_offset;
}
static inline int queue_sector_alignment_offset(struct request_queue *q,
@@ -1109,6 +1121,19 @@
& (q->limits.io_min - 1);
}
+static inline int bdev_alignment_offset(struct block_device *bdev)
+{
+ struct request_queue *q = bdev_get_queue(bdev);
+
+ if (q->limits.misaligned)
+ return -1;
+
+ if (bdev != bdev->bd_contains)
+ return bdev->bd_part->alignment_offset;
+
+ return q->limits.alignment_offset;
+}
+
static inline int queue_dma_alignment(struct request_queue *q)
{
return q ? q->dma_alignment : 511;
diff --git a/include/linux/fs.h b/include/linux/fs.h
index 2adaa25..883eaac 100644
--- a/include/linux/fs.h
+++ b/include/linux/fs.h
@@ -300,6 +300,10 @@
#define BLKTRACESTOP _IO(0x12,117)
#define BLKTRACETEARDOWN _IO(0x12,118)
#define BLKDISCARD _IO(0x12,119)
+#define BLKIOMIN _IO(0x12,120)
+#define BLKIOOPT _IO(0x12,121)
+#define BLKALIGNOFF _IO(0x12,122)
+#define BLKPBSZGET _IO(0x12,123)
#define BMAP_IOCTL 1 /* obsolete - kept for compatibility */
#define FIBMAP _IO(0x00,1) /* bmap access */