16 files changed, 424 insertions, 0 deletions

diff --git a/sys/bsm/audit_kevents.h b/sys/bsm/audit_kevents.h
index eeb928ecafdc..0da82de1fbcb 100644
--- a/sys/bsm/audit_kevents.h
+++ b/sys/bsm/audit_kevents.h
@@ -662,6 +662,7 @@
 #define	AUE_SPECIALFD		43266	/* FreeBSD-specific. */
 #define	AUE_AIO_WRITEV		43267	/* FreeBSD-specific. */
 #define	AUE_AIO_READV		43268	/* FreeBSD-specific. */
+#define	AUE_FSPACECTL		43269	/* FreeBSD-specific. */
 
 /*
  * Darwin BSM uses a number of AUE_O_* definitions, which are aliased to the
diff --git a/sys/compat/freebsd32/freebsd32.h b/sys/compat/freebsd32/freebsd32.h
index 2e4f5155cbf4..8a14a42db813 100644
--- a/sys/compat/freebsd32/freebsd32.h
+++ b/sys/compat/freebsd32/freebsd32.h
@@ -435,5 +435,9 @@ struct ptrace_coredump32 {
 	uint32_t	pc_limit1, pc_limit2;
 };
 
+struct spacectl_range32 {
+	uint32_t	r_offset1, r_offset2;
+	uint32_t	r_len1, r_len2;
+};
 
 #endif /* !_COMPAT_FREEBSD32_FREEBSD32_H_ */
diff --git a/sys/compat/freebsd32/freebsd32_misc.c b/sys/compat/freebsd32/freebsd32_misc.c
index 736fd1123d53..c417a64d286a 100644
--- a/sys/compat/freebsd32/freebsd32_misc.c
+++ b/sys/compat/freebsd32/freebsd32_misc.c
@@ -3857,3 +3857,37 @@ freebsd32_ntp_adjtime(struct thread *td, struct freebsd32_ntp_adjtime_args *uap)
 	}
 	return (error);
 }
+
+int
+freebsd32_fspacectl(struct thread *td, struct freebsd32_fspacectl_args *uap)
+{
+	struct spacectl_range rqsr, rmsr;
+	struct spacectl_range32 rqsr32, rmsr32;
+	int error, cerror;
+
+	error = copyin(uap->rqsr, &rqsr32, sizeof(rqsr32));
+	if (error != 0)
+		return (error);
+	rqsr.r_offset = PAIR32TO64(off_t, rqsr32.r_offset);
+	rqsr.r_len = PAIR32TO64(off_t, rqsr32.r_len);
+
+	error = kern_fspacectl(td, uap->fd, uap->cmd, &rqsr, uap->flags,
+	    &rmsr);
+	if (uap->rmsr != NULL) {
+#if BYTE_ORDER == LITTLE_ENDIAN
+		rmsr32.r_offset1 = rmsr.r_offset;
+		rmsr32.r_offset2 = rmsr.r_offset >> 32;
+		rmsr32.r_len1 = rmsr.r_len;
+		rmsr32.r_len2 = rmsr.r_len >> 32;
+#else
+		rmsr32.r_offset1 = rmsr.r_offset >> 32;
+		rmsr32.r_offset2 = rmsr.r_offset;
+		rmsr32.r_len1 = rmsr.r_len >> 32;
+		rmsr32.r_len2 = rmsr.r_len;
+#endif
+		cerror = copyout(&rmsr32, uap->rmsr, sizeof(rmsr32));
+		if (error == 0)
+			error = cerror;
+	}
+	return (error);
+}
diff --git a/sys/compat/freebsd32/syscalls.master b/sys/compat/freebsd32/syscalls.master
index aac788bf3956..3e53de2dc966 100644
--- a/sys/compat/freebsd32/syscalls.master
+++ b/sys/compat/freebsd32/syscalls.master
@@ -1176,5 +1176,10 @@
 				    struct aiocb32 *aiocbp); }
 579	AUE_AIO_READV	STD	{ int freebsd32_aio_readv( \
 				    struct aiocb32 *aiocbp); }
+580	AUE_FSPACECTL	STD	{ int freebsd32_fspacectl(int fd, \
+				    int cmd, \
+				    const struct spacectl_range32 *rqsr, \
+				    int flags, \
+				    struct spacectl_range32 *rmsr); }
 
 ; vim: syntax=off
diff --git a/sys/kern/capabilities.conf b/sys/kern/capabilities.conf
index 602ec7088fc6..f53530eb7fa7 100644
--- a/sys/kern/capabilities.conf
+++ b/sys/kern/capabilities.conf
@@ -229,6 +229,11 @@ freebsd6_pread
 freebsd6_pwrite
 
 ##
+## Allow I/O-related file operations, subject to capability rights.
+##
+fspacectl
+
+##
 ## Allow querying file and file system state with fstat(2) and fstatfs(2),
 ## subject to capability rights.
 ##
diff --git a/sys/kern/sys_generic.c b/sys/kern/sys_generic.c
index f86d494400e2..e6b2cba27a04 100644
--- a/sys/kern/sys_generic.c
+++ b/sys/kern/sys_generic.c
@@ -862,6 +862,76 @@ kern_posix_fallocate(struct thread *td, int fd, off_t offset, off_t len)
 }
 
 int
+sys_fspacectl(struct thread *td, struct fspacectl_args *uap)
+{
+	struct spacectl_range rqsr, rmsr;
+	int error, cerror;
+
+	error = copyin(uap->rqsr, &rqsr, sizeof(rqsr));
+	if (error != 0)
+		return (error);
+
+	error = kern_fspacectl(td, uap->fd, uap->cmd, &rqsr, uap->flags,
+	    &rmsr);
+	if (uap->rmsr != NULL) {
+		cerror = copyout(&rmsr, uap->rmsr, sizeof(rmsr));
+		if (error == 0)
+			error = cerror;
+	}
+	return (error);
+}
+
+int
+kern_fspacectl(struct thread *td, int fd, int cmd,
+    const struct spacectl_range *rqsr, int flags, struct spacectl_range *rmsrp)
+{
+	struct file *fp;
+	struct spacectl_range rmsr;
+	int error;
+
+	AUDIT_ARG_FD(fd);
+	AUDIT_ARG_CMD(cmd);
+	AUDIT_ARG_FFLAGS(flags);
+
+	if (rqsr == NULL)
+		return (EINVAL);
+	rmsr = *rqsr;
+	if (rmsrp != NULL)
+		*rmsrp = rmsr;
+
+	if (cmd != SPACECTL_DEALLOC ||
+	    rqsr->r_offset < 0 || rqsr->r_len <= 0 ||
+	    rqsr->r_offset > OFF_MAX - rqsr->r_len ||
+	    (flags & ~SPACECTL_F_SUPPORTED) != 0)
+		return (EINVAL);
+
+	error = fget_write(td, fd, &cap_pwrite_rights, &fp);
+	if (error != 0)
+		return (error);
+	AUDIT_ARG_FILE(td->td_proc, fp);
+	if ((fp->f_ops->fo_flags & DFLAG_SEEKABLE) == 0) {
+		error = ESPIPE;
+		goto out;
+	}
+	if ((fp->f_flag & FWRITE) == 0) {
+		error = EBADF;
+		goto out;
+	}
+
+	error = fo_fspacectl(fp, cmd, &rmsr.r_offset, &rmsr.r_len, flags,
+	    td->td_ucred, td);
+	/* fspacectl is not restarted after signals if the file is modified. */
+	if (rmsr.r_len != rqsr->r_len && (error == ERESTART ||
+	    error == EINTR || error == EWOULDBLOCK))
+		error = 0;
+	if (rmsrp != NULL)
+		*rmsrp = rmsr;
+out:
+	fdrop(fp, td);
+	return (error);
+}
+
+int
 kern_specialfd(struct thread *td, int type, void *arg)
 {
 	struct file *fp;
diff --git a/sys/kern/syscalls.master b/sys/kern/syscalls.master
index af787908451a..11247aed8fd6 100644
--- a/sys/kern/syscalls.master
+++ b/sys/kern/syscalls.master
@@ -3250,6 +3250,15 @@
 		    _Inout_ struct aiocb *aiocbp
 		);
 	}
+580	AUE_FSPACECTL	STD {
+		int fspacectl(
+		    int fd,
+		    int cmd,
+		    _In_ const struct spacectl_range *rqsr,
+		    int flags,
+		    _Out_opt_ struct spacectl_range *rmsr,
+		);
+	}
 
 ; Please copy any additions and changes to the following compatability tables:
 ; sys/compat/freebsd32/syscalls.master
diff --git a/sys/kern/vfs_default.c b/sys/kern/vfs_default.c
index 63bca7810847..c42d5a795935 100644
--- a/sys/kern/vfs_default.c
+++ b/sys/kern/vfs_default.c
@@ -93,6 +93,7 @@ static int vop_stdgetpages_async(struct vop_getpages_async_args *ap);
 static int vop_stdread_pgcache(struct vop_read_pgcache_args *ap);
 static int vop_stdstat(struct vop_stat_args *ap);
 static int vop_stdvput_pair(struct vop_vput_pair_args *ap);
+static int vop_stddeallocate(struct vop_deallocate_args *ap);
 
 /*
  * This vnode table stores what we want to do if the filesystem doesn't
@@ -117,6 +118,7 @@ struct vop_vector default_vnodeops = {
 	.vop_advlockasync =	vop_stdadvlockasync,
 	.vop_advlockpurge =	vop_stdadvlockpurge,
 	.vop_allocate =		vop_stdallocate,
+	.vop_deallocate =	vop_stddeallocate,
 	.vop_bmap =		vop_stdbmap,
 	.vop_close =		VOP_NULL,
 	.vop_fsync =		VOP_NULL,
@@ -518,6 +520,7 @@ vop_stdpathconf(ap)
 		case _PC_ACL_EXTENDED:
 		case _PC_ACL_NFS4:
 		case _PC_CAP_PRESENT:
+		case _PC_DEALLOC_PRESENT:
 		case _PC_INF_PRESENT:
 		case _PC_MAC_PRESENT:
 			*ap->a_retval = 0;
@@ -1069,6 +1072,125 @@ vop_stdallocate(struct vop_allocate_args *ap)
 	return (error);
 }
 
+static int
+vp_zerofill(struct vnode *vp, struct vattr *vap, off_t *offsetp, off_t *lenp,
+    struct ucred *cred)
+{
+	int iosize;
+	int error = 0;
+	struct iovec aiov;
+	struct uio auio;
+	struct thread *td;
+	off_t offset, len;
+
+	iosize = vap->va_blocksize;
+	td = curthread;
+	offset = *offsetp;
+	len = *lenp;
+
+	if (iosize == 0)
+		iosize = BLKDEV_IOSIZE;
+	/* If va_blocksize is 512 bytes, iosize will be 4 kilobytes */
+	iosize = min(iosize * 8, ZERO_REGION_SIZE);
+
+	while (len > 0) {
+		int xfersize = iosize;
+		if (offset % iosize != 0)
+			xfersize -= offset % iosize;
+		if (xfersize > len)
+			xfersize = len;
+
+		aiov.iov_base = __DECONST(void *, zero_region);
+		aiov.iov_len = xfersize;
+		auio.uio_iov = &aiov;
+		auio.uio_iovcnt = 1;
+		auio.uio_offset = offset;
+		auio.uio_resid = xfersize;
+		auio.uio_segflg = UIO_SYSSPACE;
+		auio.uio_rw = UIO_WRITE;
+		auio.uio_td = td;
+
+		error = VOP_WRITE(vp, &auio, 0, cred);
+		if (error != 0) {
+			len -= xfersize - auio.uio_resid;
+			offset += xfersize - auio.uio_resid;
+			break;
+		}
+
+		len -= xfersize;
+		offset += xfersize;
+	}
+
+	*offsetp = offset;
+	*lenp = len;
+	return (error);
+}
+
+static int
+vop_stddeallocate(struct vop_deallocate_args *ap)
+{
+	struct vnode *vp;
+	off_t offset, len;
+	struct ucred *cred;
+	int error;
+	struct vattr va;
+	off_t noff, xfersize, rem;
+
+	vp = ap->a_vp;
+	offset = *ap->a_offset;
+	len = *ap->a_len;
+	cred = ap->a_cred;
+
+	error = VOP_GETATTR(vp, &va, cred);
+	if (error)
+		return (error);
+
+	len = omin(OFF_MAX - offset, *ap->a_len);
+	while (len > 0) {
+		noff = offset;
+		error = vn_bmap_seekhole_locked(vp, FIOSEEKDATA, &noff, cred);
+		if (error) {
+			if (error != ENXIO)
+				/* XXX: Is it okay to fallback further? */
+				goto out;
+
+			/*
+			 * No more data region to be filled
+			 */
+			len = 0;
+			error = 0;
+			break;
+		}
+		KASSERT(noff >= offset, ("FIOSEEKDATA going backward"));
+		if (noff != offset) {
+			xfersize = omin(noff - offset, len);
+			len -= xfersize;
+			offset += xfersize;
+			if (len == 0)
+				break;
+		}
+		error = vn_bmap_seekhole_locked(vp, FIOSEEKHOLE, &noff, cred);
+		if (error)
+			goto out;
+
+		/* Fill zeroes */
+		xfersize = rem = omin(noff - offset, len);
+		error = vp_zerofill(vp, &va, &offset, &rem, cred);
+		if (error) {
+			len -= xfersize - rem;
+			goto out;
+		}
+
+		len -= xfersize;
+		if (should_yield())
+			break;
+	}
+out:
+	*ap->a_offset = offset;
+	*ap->a_len = len;
+	return (error);
+}
+
 int
 vop_stdadvise(struct vop_advise_args *ap)
 {
diff --git a/sys/kern/vfs_vnops.c b/sys/kern/vfs_vnops.c
index ccc468d71737..c54f55a99036 100644
--- a/sys/kern/vfs_vnops.c
+++ b/sys/kern/vfs_vnops.c
@@ -106,6 +106,7 @@ static fo_kqfilter_t	vn_kqfilter;
 static fo_close_t	vn_closefile;
 static fo_mmap_t	vn_mmap;
 static fo_fallocate_t	vn_fallocate;
+static fo_fspacectl_t	vn_fspacectl;
 
 struct 	fileops vnops = {
 	.fo_read = vn_io_fault,
@@ -123,6 +124,7 @@ struct 	fileops vnops = {
 	.fo_fill_kinfo = vn_fill_kinfo,
 	.fo_mmap = vn_mmap,
 	.fo_fallocate = vn_fallocate,
+	.fo_fspacectl = vn_fspacectl,
 	.fo_flags = DFLAG_PASSABLE | DFLAG_SEEKABLE
 };
 
@@ -3439,6 +3441,114 @@ vn_fallocate(struct file *fp, off_t offset, off_t len, struct thread *td)
 	return (error);
 }
 
+static int
+vn_deallocate_impl(struct vnode *vp, off_t *offset, off_t *length, int flags,
+    int ioflg, struct ucred *active_cred, struct ucred *file_cred)
+{
+	struct mount *mp;
+	void *rl_cookie;
+	off_t off, len;
+	int error;
+#ifdef AUDIT
+	bool audited_vnode1 = false;
+#endif
+
+	rl_cookie = NULL;
+	error = 0;
+	mp = NULL;
+	off = *offset;
+	len = *length;
+
+	if ((ioflg & (IO_NODELOCKED|IO_RANGELOCKED)) == 0)
+		rl_cookie = vn_rangelock_wlock(vp, off, off + len);
+	while (len > 0 && error == 0) {
+		/*
+		 * Try to deallocate the longest range in one pass.
+		 * In case a pass takes too long to be executed, it returns
+		 * partial result. The residue will be proceeded in the next
+		 * pass.
+		 */
+
+		if ((ioflg & IO_NODELOCKED) == 0) {
+			bwillwrite();
+			if ((error = vn_start_write(vp, &mp,
+			    V_WAIT | PCATCH)) != 0)
+				goto out;
+			vn_lock(vp, vn_lktype_write(mp, vp) | LK_RETRY);
+		}
+#ifdef AUDIT
+		if (!audited_vnode1) {
+			AUDIT_ARG_VNODE1(vp);
+			audited_vnode1 = true;
+		}
+#endif
+
+#ifdef MAC
+		if ((ioflg & IO_NOMACCHECK) == 0)
+			error = mac_vnode_check_write(active_cred, file_cred,
+			    vp);
+#endif
+		if (error == 0)
+			error = VOP_DEALLOCATE(vp, &off, &len, flags,
+			    active_cred);
+
+		if ((ioflg & IO_NODELOCKED) == 0) {
+			VOP_UNLOCK(vp);
+			if (mp != NULL) {
+				vn_finished_write(mp);
+				mp = NULL;
+			}
+		}
+	}
+out:
+	if (rl_cookie != NULL)
+		vn_rangelock_unlock(vp, rl_cookie);
+	*offset = off;
+	*length = len;
+	return (error);
+}
+
+int
+vn_deallocate(struct vnode *vp, off_t *offset, off_t *length, int flags,
+    int ioflg, struct ucred *active_cred, struct ucred *file_cred)
+{
+	if (*offset < 0 || *length <= 0 || *length > OFF_MAX - *offset ||
+	    flags != 0)
+		return (EINVAL);
+	if (vp->v_type != VREG)
+		return (ENODEV);
+
+	return (vn_deallocate_impl(vp, offset, length, flags, ioflg,
+	    active_cred, file_cred));
+}
+
+static int
+vn_fspacectl(struct file *fp, int cmd, off_t *offset, off_t *length, int flags,
+    struct ucred *active_cred, struct thread *td)
+{
+	int error;
+	struct vnode *vp;
+
+	vp = fp->f_vnode;
+
+	if (cmd != SPACECTL_DEALLOC || *offset < 0 || *length <= 0 ||
+	    *length > OFF_MAX - *offset || flags != 0)
+		return (EINVAL);
+	if (vp->v_type != VREG)
+		return (ENODEV);
+
+	switch (cmd) {
+	case SPACECTL_DEALLOC:
+		error = vn_deallocate_impl(vp, offset, length, flags, 0,
+		    active_cred, fp->f_cred);
+		break;
+	default:
+		panic("vn_fspacectl: unknown cmd %d", cmd);
+	}
+
+	return (error);
+}
+
 static u_long vn_lock_pair_pause_cnt;
 SYSCTL_ULONG(_debug, OID_AUTO, vn_lock_pair_pause, CTLFLAG_RD,
     &vn_lock_pair_pause_cnt, 0,
diff --git a/sys/kern/vnode_if.src b/sys/kern/vnode_if.src
index b506237f385d..97ac1cff6705 100644
--- a/sys/kern/vnode_if.src
+++ b/sys/kern/vnode_if.src
@@ -801,6 +801,17 @@ vop_vput_pair {
 };
 
 
+%% deallocate	vp	L L L
+
+vop_deallocate {
+	IN struct vnode *vp;
+	INOUT off_t *offset;
+	INOUT off_t *len;
+	IN int flags;
+	IN struct ucred *cred;
+};
+
+
 # The VOPs below are spares at the end of the table to allow new VOPs to be
 # added in stable branches without breaking the KBI.  New VOPs in HEAD should
 # be added above these spares.  When merging a new VOP to a stable branch,
diff --git a/sys/security/audit/audit_bsm.c b/sys/security/audit/audit_bsm.c
index d350ef3cf3c2..1f9918a42159 100644
--- a/sys/security/audit/audit_bsm.c
+++ b/sys/security/audit/audit_bsm.c
@@ -1091,6 +1091,18 @@ kaudit_to_bsm(struct kaudit_record *kar, struct au_record **pau)
 		FD_VNODE1_TOKENS;
 		break;
 
+	case AUE_FSPACECTL:
+		if (ARG_IS_VALID(kar, ARG_CMD)) {
+			tok = au_to_arg32(2, "operation", ar->ar_arg_cmd);
+			kau_write(rec, tok);
+		}
+		if (ARG_IS_VALID(kar, ARG_FFLAGS)) {
+			tok = au_to_arg32(4, "flags", ar->ar_arg_fflags);
+			kau_write(rec, tok);
+		}
+		FD_VNODE1_TOKENS;
+		break;
+
 	case AUE_RFORK:
 		if (ARG_IS_VALID(kar, ARG_FFLAGS)) {
 			tok = au_to_arg32(1, "flags", ar->ar_arg_fflags);
diff --git a/sys/sys/fcntl.h b/sys/sys/fcntl.h
index 8fa52aeacafd..934c648aecc0 100644
--- a/sys/sys/fcntl.h
+++ b/sys/sys/fcntl.h
@@ -323,6 +323,14 @@ struct __oflock {
 	short	l_type;		/* lock type: read/write, etc. */
 	short	l_whence;	/* type of l_start */
 };
+
+/*
+ * Space control offset/length description
+ */
+struct spacectl_range {
+	off_t	r_offset;	/* starting offset */
+	off_t	r_len;	/* length */
+};
 #endif
 
 #if __BSD_VISIBLE
@@ -352,6 +360,16 @@ struct __oflock {
  * similar syscalls.
  */
 #define	FD_NONE			-200
+
+/*
+ * Commands for fspacectl(2)
+ */
+#define SPACECTL_DEALLOC	1	/* deallocate space */
+
+/*
+ * fspacectl(2) flags
+ */
+#define SPACECTL_F_SUPPORTED	0
 #endif
 
 #ifndef _KERNEL
@@ -361,6 +379,8 @@ int	creat(const char *, mode_t);
 int	fcntl(int, int, ...);
 #if __BSD_VISIBLE
 int	flock(int, int);
+int	fspacectl(int, int, const struct spacectl_range *, int,
+	    struct spacectl_range *);
 #endif
 #if __POSIX_VISIBLE >= 200809
 int	openat(int, const char *, int, ...);
diff --git a/sys/sys/file.h b/sys/sys/file.h
index b16e23bdfbcf..8a790a25fc6b 100644
--- a/sys/sys/file.h
+++ b/sys/sys/file.h
@@ -129,6 +129,9 @@ typedef int fo_add_seals_t(struct file *fp, int flags);
 typedef int fo_get_seals_t(struct file *fp, int *flags);
 typedef int fo_fallocate_t(struct file *fp, off_t offset, off_t len,
 		    struct thread *td);
+typedef int fo_fspacectl_t(struct file *fp, int cmd,
+		    off_t *offset, off_t *length, int flags,
+		    struct ucred *active_cred, struct thread *td);
 typedef	int fo_flags_t;
 
 struct fileops {
@@ -150,6 +153,7 @@ struct fileops {
 	fo_add_seals_t	*fo_add_seals;
 	fo_get_seals_t	*fo_get_seals;
 	fo_fallocate_t	*fo_fallocate;
+	fo_fspacectl_t	*fo_fspacectl;
 	fo_flags_t	fo_flags;	/* DFLAG_* below */
 };
 
@@ -472,6 +476,17 @@ fo_fallocate(struct file *fp, off_t offset, off_t len, struct thread *td)
 	return ((*fp->f_ops->fo_fallocate)(fp, offset, len, td));
 }
 
+static __inline int fo_fspacectl(struct file *fp, int cmd, off_t *offset,
+    off_t *length, int flags, struct ucred *active_cred, struct thread *td)
+{
+
+	if (fp->f_ops->fo_fspacectl == NULL)
+		return (ENODEV);
+	return ((*fp->f_ops->fo_fspacectl)(fp, cmd, offset, length, flags,
+	    active_cred, td));
+}
+
+
 #endif /* _KERNEL */
 
 #endif /* !SYS_FILE_H */
diff --git a/sys/sys/syscallsubr.h b/sys/sys/syscallsubr.h
index eb7b82946988..dc1b3d6a83de 100644
--- a/sys/sys/syscallsubr.h
+++ b/sys/sys/syscallsubr.h
@@ -59,6 +59,7 @@ struct rusage;
 struct sched_param;
 union semun;
 struct sockaddr;
+struct spacectl_range;
 struct stat;
 struct thr_param;
 struct timex;
@@ -233,6 +234,8 @@ int	kern_posix_fadvise(struct thread *td, int fd, off_t offset, off_t len,
 	    int advice);
 int	kern_posix_fallocate(struct thread *td, int fd, off_t offset,
 	    off_t len);
+int	kern_fspacectl(struct thread *td, int fd, int cmd,
+	    const struct spacectl_range *, int flags, struct spacectl_range *);
 int	kern_procctl(struct thread *td, enum idtype idtype, id_t id, int com,
 	    void *data);
 int	kern_pread(struct thread *td, int fd, void *buf, size_t nbyte,
diff --git a/sys/sys/unistd.h b/sys/sys/unistd.h
index 3b3de3aa33bc..ef8835a812d2 100644
--- a/sys/sys/unistd.h
+++ b/sys/sys/unistd.h
@@ -156,6 +156,7 @@
 #define	_PC_INF_PRESENT		62
 #define	_PC_MAC_PRESENT		63
 #define	_PC_ACL_NFS4		64
+#define	_PC_DEALLOC_PRESENT	65
 #endif
 
 /* From OpenSolaris, used by SEEK_DATA/SEEK_HOLE. */
diff --git a/sys/sys/vnode.h b/sys/sys/vnode.h
index 702fd6623e6a..56591a8d8a8d 100644
--- a/sys/sys/vnode.h
+++ b/sys/sys/vnode.h
@@ -741,6 +741,8 @@ int	vn_copy_file_range(struct vnode *invp, off_t *inoffp,
 	    struct vnode *outvp, off_t *outoffp, size_t *lenp,
 	    unsigned int flags, struct ucred *incred, struct ucred *outcred,
 	    struct thread *fsize_td);
+int	vn_deallocate(struct vnode *vp, off_t *offset, off_t *length, int flags,
+	    int ioflg, struct ucred *active_cred, struct ucred *file_cred);
 void	vn_finished_write(struct mount *mp);
 void	vn_finished_secondary_write(struct mount *mp);
 int	vn_fsync_buf(struct vnode *vp, int waitfor);