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move a useful ioctl here, from mkntfs

edge.strict_endians
flatcap 2005-11-19 14:55:51 +00:00
parent 2bc1f13f99
commit 8ee10753ce
2 changed files with 37 additions and 0 deletions
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1
include/ntfs/device.h
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@ -117,5 +117,6 @@ 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);
extern int ntfs_device_heads_get(struct ntfs_device *dev);
extern int ntfs_device_sectors_per_track_get(struct ntfs_device *dev);
extern int ntfs_device_sector_size_get(struct ntfs_device *dev);
#endif /* defined _NTFS_DEVICE_H */

36
libntfs/device.c
View File

@ -72,6 +72,9 @@
#if defined(linux) && !defined(HDIO_GETGEO)
#define HDIO_GETGEO 0x0301 /* Get device geometry. */
#endif
#if defined(linux) && defined(_IO) && !defined(BLKSSZGET)
# define BLKSSZGET _IO(0x12,104) /* Get device sector size in bytes. */
#endif
/**
* ntfs_device_alloc - allocate an ntfs device structure and pre-initialize it
@ -638,3 +641,36 @@ int ntfs_device_sectors_per_track_get(struct ntfs_device *dev)
#endif
return -1;
}
/**
* ntfs_device_sector_size_get - get sector size of a device
* @dev: open device
*
* On success, return the sector size in bytes of the device @dev.
* On error return -1 with errno set to the error code.
*
* The following error codes are defined:
* EINVAL Input parameter error
* EOPNOTSUPP System does not support HDIO_GETGEO ioctl
* ENOTTY @dev is a file or a device not supporting HDIO_GETGEO
*/
int ntfs_device_sector_size_get(struct ntfs_device *dev)
{
if (!dev) {
errno = EINVAL;
return -1;
}
#ifdef BLKSSZGET
{
int sect_size = 0;
if (!dev->d_ops->ioctl(dev, BLKSSZGET, &sect_size)) {
ntfs_log_debug("BLKSSZGET sector size = %d bytes\n", sect_size);
return sect_size;
}
}
#else
errno = EOPNOTSUPP;
#endif
return -1;
}