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Man Pages
VN_ISDISK(9) FreeBSD Kernel Developer's Manual VN_ISDISK(9)

vn_isdisk
checks if a vnode represents a disk

#include <sys/param.h>
#include <sys/vnode.h>
int
vn_isdisk(struct vnode *vp, int *errp);

The vn_isdisk() function checks to see if vp represents a disk. In order for vp to be a disk, it must be a character device, v_rdev must be valid, and the cdevsw entry's flags must have D_DISK set.
Its arguments are:
vp
The vnode to check.
errp
An integer pointer to store the error number in if the call fails.

If the vnode represents a disk, 1 is returned; otherwise, 0 is returned and errp will contain the error number.

This manual page was written by Chad David <davidc@acns.ab.ca>.
July 9, 2001 FreeBSD 12.0-RELEASE

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