lib/fs: Use file clone ioctl wrappers and types from golang.org/x/sys/unix (#7000)

Use the IoctlFileClone and IoctlFileCloneRange ioctl wrappers and the
FileCloneRange type provided by golang.org/x/sys/unix instead of
locally implementing them. This also allows to re-enable the code for
ppc/ppc64/ppc64le again (see commit 758a1a6a3729 ("lib/fs: Disable ioctl
on ppc (fixes #6898) (#6901)")) since golang.org/x/sys/unix internally
uses the correct FICLONE and FICLONERANGE values depending on $GOARCH.

go.mod

@@ -45,7 +45,7 @@ require (
 	github.com/vitrun/qart v0.0.0-20160531060029-bf64b92db6b0
 	golang.org/x/crypto v0.0.0-20200728195943-123391ffb6de
 	golang.org/x/net v0.0.0-20200813134508-3edf25e44fcc
-	golang.org/x/sys v0.0.0-20200819171115-d785dc25833f
+	golang.org/x/sys v0.0.0-20200922070232-aee5d888a860
 	golang.org/x/text v0.3.3
 	golang.org/x/time v0.0.0-20190308202827-9d24e82272b4
 	google.golang.org/protobuf v1.25.0 // indirect

go.sum

@@ -199,19 +199,10 @@ github.com/marten-seemann/qtls v0.10.0 h1:ECsuYUKalRL240rRD4Ri33ISb7kAQ3qGDlrrl5
 github.com/marten-seemann/qtls v0.10.0/go.mod h1:UvMd1oaYDACI99/oZUYLzMCkBXQVT0aGm99sJhbT8hs=
 github.com/marten-seemann/qtls-go1-15 v0.1.0 h1:i/YPXVxz8q9umso/5y474CNcHmTpA+5DH+mFPjx6PZg=
 github.com/marten-seemann/qtls-go1-15 v0.1.0/go.mod h1:GyFwywLKkRt+6mfU99csTEY1joMZz5vmB1WNZH3P81I=
-github.com/maruel/panicparse v1.3.0 h1:1Ep/RaYoSL1r5rTILHQQbyzHG8T4UP5ZbQTYTo4bdDc=
-github.com/maruel/panicparse v1.3.0/go.mod h1:vszMjr5QQ4F5FSRfraldcIA/BCw5xrdLL+zEcU2nRBs=
 github.com/maruel/panicparse v1.5.1 h1:hUPcXI7ubtEqj/k+P34KsHQqb86zuVk7zBfkP6tBBPc=
 github.com/maruel/panicparse v1.5.1/go.mod h1:aOutY/MUjdj80R0AEVI9qE2zHqig+67t2ffUDDiLzAM=
-github.com/mattn/go-colorable v0.1.1 h1:G1f5SKeVxmagw/IyvzvtZE4Gybcc4Tr1tf7I8z0XgOg=
-github.com/mattn/go-colorable v0.1.1/go.mod h1:FuOcm+DKB9mbwrcAfNl7/TZVBZ6rcnceauSikq3lYCQ=
 github.com/mattn/go-colorable v0.1.6 h1:6Su7aK7lXmJ/U79bYtBjLNaha4Fs1Rg9plHpcH+vvnE=
 github.com/mattn/go-colorable v0.1.6/go.mod h1:u6P/XSegPjTcexA+o6vUJrdnUu04hMope9wVRipJSqc=
-github.com/mattn/go-isatty v0.0.5/go.mod h1:Iq45c/XA43vh69/j3iqttzPXn0bhXyGjM0Hdxcsrc5s=
-github.com/mattn/go-isatty v0.0.7 h1:UvyT9uN+3r7yLEYSlJsbQGdsaB/a0DlgWP3pql6iwOc=
-github.com/mattn/go-isatty v0.0.7/go.mod h1:Iq45c/XA43vh69/j3iqttzPXn0bhXyGjM0Hdxcsrc5s=
-github.com/mattn/go-isatty v0.0.11 h1:FxPOTFNqGkuDUGi3H/qkUbQO4ZiBa2brKq5r0l8TGeM=
-github.com/mattn/go-isatty v0.0.11/go.mod h1:PhnuNfih5lzO57/f3n+odYbM4JtupLOxQOAqxQCu2WE=
 github.com/mattn/go-isatty v0.0.12 h1:wuysRhFDzyxgEmMf5xjvJ2M9dZoWAXNNr5LSBS7uHXY=
 github.com/mattn/go-isatty v0.0.12/go.mod h1:cbi8OIDigv2wuxKPP5vlRcQ1OAZbq2CE4Kysco4FUpU=
 github.com/matttproud/golang_protobuf_extensions v1.0.1 h1:4hp9jkHxhMHkqkrB3Ix0jegS5sx/RkqARlsWZ6pIwiU=
@@ -412,8 +403,6 @@ golang.org/x/sys v0.0.0-20181116152217-5ac8a444bdc5/go.mod h1:STP8DvDyc/dI5b8T5h
 golang.org/x/sys v0.0.0-20181205085412-a5c9d58dba9a/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
 golang.org/x/sys v0.0.0-20190215142949-d0b11bdaac8a h1:1BGLXjeY4akVXGgbC9HugT3Jv3hCI0z56oJR5vAMgBU=
 golang.org/x/sys v0.0.0-20190215142949-d0b11bdaac8a/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
-golang.org/x/sys v0.0.0-20190222072716-a9d3bda3a223 h1:DH4skfRX4EBpamg7iV4ZlCpblAHI6s6TDM39bFZumv8=
-golang.org/x/sys v0.0.0-20190222072716-a9d3bda3a223/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
 golang.org/x/sys v0.0.0-20190316082340-a2f829d7f35f/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
 golang.org/x/sys v0.0.0-20190412213103-97732733099d/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
 golang.org/x/sys v0.0.0-20190422165155-953cdadca894/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
@@ -423,8 +412,6 @@ golang.org/x/sys v0.0.0-20190904154756-749cb33beabd/go.mod h1:h1NjWce9XRLGQEsW7w
 golang.org/x/sys v0.0.0-20191005200804-aed5e4c7ecf9/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
 golang.org/x/sys v0.0.0-20191010194322-b09406accb47 h1:/XfQ9z7ib8eEJX2hdgFTZJ/ntt0swNk5oYBziWeTCvY=
 golang.org/x/sys v0.0.0-20191010194322-b09406accb47/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
-golang.org/x/sys v0.0.0-20191026070338-33540a1f6037 h1:YyJpGZS1sBuBCzLAR1VEpK193GlqGZbnPFnPV/5Rsb4=
-golang.org/x/sys v0.0.0-20191026070338-33540a1f6037/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
 golang.org/x/sys v0.0.0-20191120155948-bd437916bb0e/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
 golang.org/x/sys v0.0.0-20191224085550-c709ea063b76 h1:Dho5nD6R3PcW2SH1or8vS0dszDaXRxIw55lBX7XiE5g=
 golang.org/x/sys v0.0.0-20191224085550-c709ea063b76/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
@@ -435,8 +422,8 @@ golang.org/x/sys v0.0.0-20200323222414-85ca7c5b95cd/go.mod h1:h1NjWce9XRLGQEsW7w
 golang.org/x/sys v0.0.0-20200519105757-fe76b779f299 h1:DYfZAGf2WMFjMxbgTjaC+2HC7NkNAQs+6Q8b9WEB/F4=
 golang.org/x/sys v0.0.0-20200519105757-fe76b779f299/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
 golang.org/x/sys v0.0.0-20200814200057-3d37ad5750ed/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
-golang.org/x/sys v0.0.0-20200819171115-d785dc25833f h1:KJuwZVtZBVzDmEDtB2zro9CXkD9O0dpCv4o2LHbQIAw=
-golang.org/x/sys v0.0.0-20200819171115-d785dc25833f/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
+golang.org/x/sys v0.0.0-20200922070232-aee5d888a860 h1:YEu4SMq7D0cmT7CBbXfcH0NZeuChAXwsHe/9XueUO6o=
+golang.org/x/sys v0.0.0-20200922070232-aee5d888a860/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
 golang.org/x/text v0.0.0-20170915032832-14c0d48ead0c/go.mod h1:NqM8EUOU14njkJ3fqMW+pc6Ldnwhi/IjpwHt7yyuwOQ=
 golang.org/x/text v0.3.0 h1:g61tztE5qeGQ89tm6NTjjM9VPIm088od1l6aSorWRWg=
 golang.org/x/text v0.3.0/go.mod h1:NqM8EUOU14njkJ3fqMW+pc6Ldnwhi/IjpwHt7yyuwOQ=

lib/fs/basicfs_copy_range_ioctl.go

@@ -4,40 +4,20 @@
 // License, v. 2.0. If a copy of the MPL was not distributed with this file,
 // You can obtain one at https://mozilla.org/MPL/2.0/.
 
-// +build linux,!ppc,!ppc64,!ppc64le
+// +build linux
 
 package fs
 
 import (
 	"io"
-	"syscall"
-	"unsafe"
+
+	"golang.org/x/sys/unix"
 )
 
 func init() {
 	registerCopyRangeImplementation(CopyRangeMethodIoctl, copyRangeImplementationForBasicFile(copyRangeIoctl))
 }
 
-const FICLONE = 0x40049409
-const FICLONERANGE = 0x4020940d
-
-/*
-http://man7.org/linux/man-pages/man2/ioctl_ficlonerange.2.html
-
-struct file_clone_range {
-   __s64 src_fd;
-   __u64 src_offset;
-   __u64 src_length;
-   __u64 dest_offset;
-};
-*/
-type fileCloneRange struct {
-	srcFd     int64
-	srcOffset uint64
-	srcLength uint64
-	dstOffset uint64
-}
-
 func copyRangeIoctl(src, dst basicFile, srcOffset, dstOffset, size int64) error {
 	fi, err := src.Stat()
 	if err != nil {
@@ -56,38 +36,20 @@ func copyRangeIoctl(src, dst basicFile, srcOffset, dstOffset, size int64) error
 
 	if srcOffset == 0 && dstOffset == 0 && size == 0 {
 		// Optimization for whole file copies.
-		var errNo syscall.Errno
 		_, err := withFileDescriptors(src, dst, func(srcFd, dstFd uintptr) (int, error) {
-			_, _, errNo = syscall.Syscall(syscall.SYS_IOCTL, dstFd, FICLONE, srcFd)
-			return 0, nil
+			return 0, unix.IoctlFileClone(int(dstFd), int(srcFd))
 		})
-		// Failure in withFileDescriptors
-		if err != nil {
-			return err
-		}
-		if errNo != 0 {
-			return errNo
-		}
-		return nil
+		return err
 	}
 
-	var errNo syscall.Errno
 	_, err = withFileDescriptors(src, dst, func(srcFd, dstFd uintptr) (int, error) {
-		params := fileCloneRange{
-			srcFd:     int64(srcFd),
-			srcOffset: uint64(srcOffset),
-			srcLength: uint64(size),
-			dstOffset: uint64(dstOffset),
+		params := unix.FileCloneRange{
+			Src_fd:      int64(srcFd),
+			Src_offset:  uint64(srcOffset),
+			Src_length:  uint64(size),
+			Dest_offset: uint64(dstOffset),
 		}
-		_, _, errNo = syscall.Syscall(syscall.SYS_IOCTL, dstFd, FICLONERANGE, uintptr(unsafe.Pointer(&params)))
-		return 0, nil
+		return 0, unix.IoctlFileCloneRange(int(dstFd), &params)
 	})
-	// Failure in withFileDescriptors
-	if err != nil {
-		return err
-	}
-	if errNo != 0 {
-		return errNo
-	}
-	return nil
+	return err
 }