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Add new API device.[hc]::ntfs_device_partition_start_sector_get() and 

make mkntfs use it.

(Logical change 1.336)
edge.strict_endians
cantab.net!aia21 2004-03-17 12:22:03 +00:00
parent 78a57841cb
commit 9318887cd5
2 changed files with 37 additions and 2 deletions
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2
include/ntfs/device.h
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@ -109,4 +109,6 @@ extern s64 ntfs_cluster_write(const ntfs_volume *vol, const s64 lcn,
extern s64 ntfs_device_size_get(struct ntfs_device *dev, int block_size);
extern s64 ntfs_device_partition_start_sector_get(struct ntfs_device *dev);
#endif /* defined _NTFS_DEVICE_H */

37
libntfs/device.c
View File

@ -33,6 +33,9 @@
#ifdef HAVE_LINUX_FD_H
# include <linux/fd.h>
#endif
#ifdef HAVE_LINUX_HDREG_H
# include <linux/hdreg.h>
#endif
#include "types.h"
#include "mst.h"
@ -40,10 +43,13 @@
#include "device.h"
#if defined(linux) && defined(_IO) && !defined(BLKGETSIZE)
#define BLKGETSIZE _IO(0x12,96) /* Get device size in 512-byte blocks. */
#define BLKGETSIZE _IO(0x12,96) /* Get device size in 512-byte blocks. */
#endif
#if defined(linux) && defined(_IOR) && !defined(BLKGETSIZE64)
#define BLKGETSIZE64 _IOR(0x12,114,size_t) /* Get device size in bytes. */
#define BLKGETSIZE64 _IOR(0x12,114,size_t) /* Get device size in bytes. */
#endif
#if defined(linux) && !defined(HDIO_GETGEO)
#define HDIO_GETGEO 0x0301 /* Get device geometry. */
#endif
/**
@ -506,3 +512,30 @@ s64 ntfs_device_size_get(struct ntfs_device *dev, int block_size)
return (low + 1LL) / block_size;
}
/**
* ntfs_device_partition_start_sector_get - get starting sector of a partition
* @dev: open device
*
* On success, return the starting sector of the partition @dev in the parent
* block device of @dev. On error return -1 with errno set to the error code.
*
* The following error codes are defined:
* ENOTSUP System does not support HDIO_GETGEO ioctl
* ENOTTY @dev is a file or a device not supporting HDIO_GETGEO
*/
s64 ntfs_device_partition_start_sector_get(struct ntfs_device *dev)
{
#ifdef HDIO_GETGEO
{ struct hd_geometry geo;
if (!dev->d_ops->ioctl(dev, HDIO_GETGEO, &geo)) {
Dprintf("HDIO_GETGEO start_sect = %lu (0x%lx)\n",
geo.start, geo.start);
return geo.start;
}
}
#else
errno = ENOTSUP;
#endif
return -1;
}