unix: add API for fsconfig system call
Fixes golang/go#59537
Change-Id: I8d806ace3adad423c633813455d8f758706cee1d
Reviewed-on: https://go-review.googlesource.com/c/sys/+/484995
Reviewed-by: Than McIntosh <thanm@google.com>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Auto-Submit: Ian Lance Taylor <iant@google.com>
Reviewed-by: Ian Lance Taylor <iant@google.com>
diff --git a/unix/linux/types.go b/unix/linux/types.go
index 85597a4..19122b2 100644
--- a/unix/linux/types.go
+++ b/unix/linux/types.go
@@ -989,6 +989,15 @@
FSPICK_EMPTY_PATH = C.FSPICK_EMPTY_PATH
FSMOUNT_CLOEXEC = C.FSMOUNT_CLOEXEC
+
+ FSCONFIG_SET_FLAG = C.FSCONFIG_SET_FLAG
+ FSCONFIG_SET_STRING = C.FSCONFIG_SET_STRING
+ FSCONFIG_SET_BINARY = C.FSCONFIG_SET_BINARY
+ FSCONFIG_SET_PATH = C.FSCONFIG_SET_PATH
+ FSCONFIG_SET_PATH_EMPTY = C.FSCONFIG_SET_PATH_EMPTY
+ FSCONFIG_SET_FD = C.FSCONFIG_SET_FD
+ FSCONFIG_CMD_CREATE = C.FSCONFIG_CMD_CREATE
+ FSCONFIG_CMD_RECONFIGURE = C.FSCONFIG_CMD_RECONFIGURE
)
type OpenHow C.struct_open_how
diff --git a/unix/syscall_linux.go b/unix/syscall_linux.go
index 0f85e29..5682e26 100644
--- a/unix/syscall_linux.go
+++ b/unix/syscall_linux.go
@@ -1849,6 +1849,105 @@
//sys Fsmount(fd int, flags int, mountAttrs int) (fsfd int, err error)
//sys Fsopen(fsName string, flags int) (fd int, err error)
//sys Fspick(dirfd int, pathName string, flags int) (fd int, err error)
+
+//sys fsconfig(fd int, cmd uint, key *byte, value *byte, aux int) (err error)
+
+func fsconfigCommon(fd int, cmd uint, key string, value *byte, aux int) (err error) {
+ var keyp *byte
+ if keyp, err = BytePtrFromString(key); err != nil {
+ return
+ }
+ return fsconfig(fd, cmd, keyp, value, aux)
+}
+
+// FsconfigSetFlag is equivalent to fsconfig(2) called
+// with cmd == FSCONFIG_SET_FLAG.
+//
+// fd is the filesystem context to act upon.
+// key the parameter key to set.
+func FsconfigSetFlag(fd int, key string) (err error) {
+ return fsconfigCommon(fd, FSCONFIG_SET_FLAG, key, nil, 0)
+}
+
+// FsconfigSetString is equivalent to fsconfig(2) called
+// with cmd == FSCONFIG_SET_STRING.
+//
+// fd is the filesystem context to act upon.
+// key the parameter key to set.
+// value is the parameter value to set.
+func FsconfigSetString(fd int, key string, value string) (err error) {
+ var valuep *byte
+ if valuep, err = BytePtrFromString(value); err != nil {
+ return
+ }
+ return fsconfigCommon(fd, FSCONFIG_SET_STRING, key, valuep, 0)
+}
+
+// FsconfigSetBinary is equivalent to fsconfig(2) called
+// with cmd == FSCONFIG_SET_BINARY.
+//
+// fd is the filesystem context to act upon.
+// key the parameter key to set.
+// value is the parameter value to set.
+func FsconfigSetBinary(fd int, key string, value []byte) (err error) {
+ if len(value) == 0 {
+ return EINVAL
+ }
+ return fsconfigCommon(fd, FSCONFIG_SET_BINARY, key, &value[0], len(value))
+}
+
+// FsconfigSetPath is equivalent to fsconfig(2) called
+// with cmd == FSCONFIG_SET_PATH.
+//
+// fd is the filesystem context to act upon.
+// key the parameter key to set.
+// path is a non-empty path for specified key.
+// atfd is a file descriptor at which to start lookup from or AT_FDCWD.
+func FsconfigSetPath(fd int, key string, path string, atfd int) (err error) {
+ var valuep *byte
+ if valuep, err = BytePtrFromString(path); err != nil {
+ return
+ }
+ return fsconfigCommon(fd, FSCONFIG_SET_PATH, key, valuep, atfd)
+}
+
+// FsconfigSetPathEmpty is equivalent to fsconfig(2) called
+// with cmd == FSCONFIG_SET_PATH_EMPTY. The same as
+// FconfigSetPath but with AT_PATH_EMPTY implied.
+func FsconfigSetPathEmpty(fd int, key string, path string, atfd int) (err error) {
+ var valuep *byte
+ if valuep, err = BytePtrFromString(path); err != nil {
+ return
+ }
+ return fsconfigCommon(fd, FSCONFIG_SET_PATH_EMPTY, key, valuep, atfd)
+}
+
+// FsconfigSetFd is equivalent to fsconfig(2) called
+// with cmd == FSCONFIG_SET_FD.
+//
+// fd is the filesystem context to act upon.
+// key the parameter key to set.
+// value is a file descriptor to be assigned to specified key.
+func FsconfigSetFd(fd int, key string, value int) (err error) {
+ return fsconfigCommon(fd, FSCONFIG_SET_FD, key, nil, value)
+}
+
+// FsconfigCreate is equivalent to fsconfig(2) called
+// with cmd == FSCONFIG_CMD_CREATE.
+//
+// fd is the filesystem context to act upon.
+func FsconfigCreate(fd int) (err error) {
+ return fsconfig(fd, FSCONFIG_CMD_CREATE, nil, nil, 0)
+}
+
+// FsconfigReconfigure is equivalent to fsconfig(2) called
+// with cmd == FSCONFIG_CMD_RECONFIGURE.
+//
+// fd is the filesystem context to act upon.
+func FsconfigReconfigure(fd int) (err error) {
+ return fsconfig(fd, FSCONFIG_CMD_RECONFIGURE, nil, nil, 0)
+}
+
//sys Getdents(fd int, buf []byte) (n int, err error) = SYS_GETDENTS64
//sysnb Getpgid(pid int) (pgid int, err error)
diff --git a/unix/zsyscall_linux.go b/unix/zsyscall_linux.go
index 1488d27..87d8612 100644
--- a/unix/zsyscall_linux.go
+++ b/unix/zsyscall_linux.go
@@ -906,6 +906,16 @@
// THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
+func fsconfig(fd int, cmd uint, key *byte, value *byte, aux int) (err error) {
+ _, _, e1 := Syscall6(SYS_FSCONFIG, uintptr(fd), uintptr(cmd), uintptr(unsafe.Pointer(key)), uintptr(unsafe.Pointer(value)), uintptr(aux), 0)
+ if e1 != 0 {
+ err = errnoErr(e1)
+ }
+ return
+}
+
+// THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
+
func Getdents(fd int, buf []byte) (n int, err error) {
var _p0 unsafe.Pointer
if len(buf) > 0 {
diff --git a/unix/ztypes_linux.go b/unix/ztypes_linux.go
index 89d7274..eff6bcd 100644
--- a/unix/ztypes_linux.go
+++ b/unix/ztypes_linux.go
@@ -836,6 +836,15 @@
FSPICK_EMPTY_PATH = 0x8
FSMOUNT_CLOEXEC = 0x1
+
+ FSCONFIG_SET_FLAG = 0x0
+ FSCONFIG_SET_STRING = 0x1
+ FSCONFIG_SET_BINARY = 0x2
+ FSCONFIG_SET_PATH = 0x3
+ FSCONFIG_SET_PATH_EMPTY = 0x4
+ FSCONFIG_SET_FD = 0x5
+ FSCONFIG_CMD_CREATE = 0x6
+ FSCONFIG_CMD_RECONFIGURE = 0x7
)
type OpenHow struct {
