# HG changeset patch
# Parent 3312b0f02247e73151fc8dcdf01a174d062c0d18
Add fallocate and fdiscard syscalls.

diff -r 3312b0f02247 sys/kern/syscalls.master
--- a/sys/kern/syscalls.master	Sun Mar 23 23:21:53 2014 -0400
+++ b/sys/kern/syscalls.master	Sun Mar 23 23:40:15 2014 -0400
@@ -944,3 +944,7 @@
 478	STD 		{ int|sys|60|_lwp_park(clockid_t clock_id, int flags, \
 			    const struct timespec *ts, lwpid_t unpark, \
 			    const void *hint, const void *unparkhint); }
+479	STD  RUMP	{ int|sys||fallocate(int fd, int PAD, off_t pos, \
+			    off_t len); }
+480	STD  RUMP	{ int|sys||fdiscard(int fd, int PAD, off_t pos, \
+			    off_t len); }
diff -r 3312b0f02247 sys/kern/vfs_syscalls.c
--- a/sys/kern/vfs_syscalls.c	Sun Mar 23 23:21:53 2014 -0400
+++ b/sys/kern/vfs_syscalls.c	Sun Mar 23 23:40:15 2014 -0400
@@ -116,6 +116,11 @@
 #include <nfs/nfs.h>
 #include <nfs/nfs_var.h>
 
+/* XXX this shouldn't be here */
+#ifndef OFF_T_MAX
+#define OFF_T_MAX __type_max(off_t)
+#endif
+
 static int change_flags(struct vnode *, u_long, struct lwp *);
 static int change_mode(struct vnode *, int, struct lwp *);
 static int change_owner(struct vnode *, uid_t, gid_t, struct lwp *, int);
@@ -4685,3 +4690,105 @@
 	vrele(vp);
 	return (error);
 }
+
+/*
+ * Allocate backing store for a file, filling a hole without having to
+ * explicitly write anything out.
+ */
+/* ARGSUSED */
+int
+sys_fallocate(struct lwp *l, const struct sys_fallocate_args *uap,
+		register_t *retval)
+{
+	/* {
+		syscallarg(int) fd;
+		syscallarg(off_t) pos;
+		syscallarg(off_t) len;
+	} */
+	int fd;
+	off_t pos, len;
+	struct file *fp;
+	struct vnode *vp;
+	int result;
+
+	fd = SCARG(uap, fd);
+	pos = SCARG(uap, pos);
+	len = SCARG(uap, len);
+	
+	if (pos < 0 || len < 0 || len > OFF_T_MAX - pos) {
+		return EINVAL;
+	}
+	
+	result = fd_getvnode(fd, &fp);
+	if (result) {
+		return result;
+	}
+	if ((fp->f_flag & FWRITE) == 0) {
+		result = EBADF;
+		goto fail;
+	}
+	vp = fp->f_data;
+
+	vn_lock(vp, LK_EXCLUSIVE | LK_RETRY);
+	if (vp->v_type == VDIR) {
+		result = EISDIR;
+	} else {
+		result = VOP_FALLOCATE(vp, pos, len);
+	}
+	VOP_UNLOCK(vp);
+
+fail:
+	fd_putfile(fd);
+	return result;
+}
+
+/*
+ * Dellocate backing store for a file, creating a hole. Also used for
+ * invoking TRIM on disks.
+ */
+/* ARGSUSED */
+int
+sys_fdiscard(struct lwp *l, const struct sys_fdiscard_args *uap,
+		register_t *retval)
+{
+	/* {
+		syscallarg(int) fd;
+		syscallarg(off_t) pos;
+		syscallarg(off_t) len;
+	} */
+	int fd;
+	off_t pos, len;
+	struct file *fp;
+	struct vnode *vp;
+	int result;
+
+	fd = SCARG(uap, fd);
+	pos = SCARG(uap, pos);
+	len = SCARG(uap, len);
+
+	if (pos < 0 || len < 0 || len > OFF_T_MAX - pos) {
+		return EINVAL;
+	}
+	
+	result = fd_getvnode(fd, &fp);
+	if (result) {
+		return result;
+	}
+	if ((fp->f_flag & FWRITE) == 0) {
+		result = EBADF;
+		goto fail;
+	}
+	vp = fp->f_data;
+
+	vn_lock(vp, LK_EXCLUSIVE | LK_RETRY);
+	if (vp->v_type == VDIR) {
+		result = EISDIR;
+	} else {
+		result = VOP_FDISCARD(vp, pos, len);
+	}
+	VOP_UNLOCK(vp);
+
+fail:
+	fd_putfile(fd);
+	return result;
+}