size64(D2)size64(D2)NAMEsize64 - return size of logical block device
SYNOPSIS
#include <sys/types.h>
#include <sys/param.h>
#include <sys/ddi.h>
int prefixsize64(dev_t dev, daddr_t *blocks);
Arguments
dev The logical device number.
blocks The size of the device in NBPSCTR-byte units (output argument).
DESCRIPTION
The size64 entry point returns in blocks the number of NBPSCTR-byte units
on a logical block device (partition), if successful. If unsuccessful -1
is returned in blocks. NBPSCTR, defined in param.h, is the number of
bytes per logical disk sector.
Return Values
On success, the size64 routine should return 0; on failure, the return
value should be an error code.
USAGE
This entry point is optional in all block device drivers, required only
when it is possible to have a device whose size NBPSCTR-byte units will
not fit into an int.
size64(D2) is called only when the device is open.
Synchronization Constraints
The size64 routine has user context and can sleep. However, it should be
careful not to spend much time sleeping, especially if the routine is
called when the logical device is not open.
SEE ALSOsize(D2)
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