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8181493: (fs) Files.readAttributes(path, BasicFileAttributes.class) should preserve nano second time stamps

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Reviewed-by: alanb, lancea
This commit is contained in:
Brian Burkhalter 2019-07-29 08:48:52 -07:00
parent 1ed3649f48
commit 20ee82bf0a
5 changed files with 159 additions and 14 deletions
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21
src/java.base/unix/classes/sun/nio/fs/UnixFileAttributeViews.java
View file

@ -73,6 +73,7 @@ class UnixFileAttributeViews {
boolean haveFd = false;
boolean useFutimes = false;
boolean useFutimens = false;
boolean useLutimes = false;
int fd = -1;
try {
@ -84,7 +85,9 @@ class UnixFileAttributeViews {
fd = file.openForAttributeAccess(followLinks);
if (fd != -1) {
haveFd = true;
useFutimes = futimesSupported();
if (!(useFutimens = futimensSupported())) {
useFutimes = futimesSupported();
}
}
}
} catch (UnixException x) {
@ -112,13 +115,17 @@ class UnixFileAttributeViews {
}
}
// uptime times
long modValue = lastModifiedTime.to(TimeUnit.MICROSECONDS);
long accessValue= lastAccessTime.to(TimeUnit.MICROSECONDS);
// update times
TimeUnit timeUnit = useFutimens ?
TimeUnit.NANOSECONDS : TimeUnit.MICROSECONDS;
long modValue = lastModifiedTime.to(timeUnit);
long accessValue= lastAccessTime.to(timeUnit);
boolean retry = false;
try {
if (useFutimes) {
if (useFutimens) {
futimens(fd, accessValue, modValue);
} else if (useFutimes) {
futimes(fd, accessValue, modValue);
} else if (useLutimes) {
lutimes(file, accessValue, modValue);
@ -139,7 +146,9 @@ class UnixFileAttributeViews {
if (modValue < 0L) modValue = 0L;
if (accessValue < 0L) accessValue= 0L;
try {
if (useFutimes) {
if (useFutimens) {
futimens(fd, accessValue, modValue);
} else if (useFutimes) {
futimes(fd, accessValue, modValue);
} else if (useLutimes) {
lutimes(file, accessValue, modValue);

16
src/java.base/unix/classes/sun/nio/fs/UnixFileAttributes.java
View file

@ -1,5 +1,5 @@
/*
* Copyright (c) 2008, 2013, Oracle and/or its affiliates. All rights reserved.
* Copyright (c) 2008, 2019, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
@ -109,11 +109,15 @@ class UnixFileAttributes
if (nsec == 0) {
return FileTime.from(sec, TimeUnit.SECONDS);
} else {
// truncate to microseconds to avoid overflow with timestamps
// way out into the future. We can re-visit this if FileTime
// is updated to define a from(secs,nsecs) method.
long micro = sec*1000000L + nsec/1000L;
return FileTime.from(micro, TimeUnit.MICROSECONDS);
try {
long nanos = Math.addExact(nsec,
Math.multiplyExact(sec, 1_000_000_000L));
return FileTime.from(nanos, TimeUnit.NANOSECONDS);
} catch (ArithmeticException ignore) {
// truncate to microseconds if nanoseconds overflow
long micro = sec*1_000_000L + nsec/1_000L;
return FileTime.from(micro, TimeUnit.MICROSECONDS);
}
}
}

15
src/java.base/unix/classes/sun/nio/fs/UnixNativeDispatcher.java
View file

@ -418,6 +418,11 @@ class UnixNativeDispatcher {
*/
static native void futimes(int fd, long times0, long times1) throws UnixException;
/**
* futimens(int fildes, const struct timespec times[2])
*/
static native void futimens(int fd, long times0, long times1) throws UnixException;
/**
* lutimes(const char* path, const struct timeval times[2])
*/
@ -593,7 +598,8 @@ class UnixNativeDispatcher {
*/
private static final int SUPPORTS_OPENAT = 1 << 1; // syscalls
private static final int SUPPORTS_FUTIMES = 1 << 2;
private static final int SUPPORTS_LUTIMES = 1 << 4;
private static final int SUPPORTS_FUTIMENS = 1 << 4;
private static final int SUPPORTS_LUTIMES = 1 << 8;
private static final int SUPPORTS_BIRTHTIME = 1 << 16; // other features
private static final int capabilities;
@ -611,6 +617,13 @@ class UnixNativeDispatcher {
return (capabilities & SUPPORTS_FUTIMES) != 0;
}
/**
* Supports futimens
*/
static boolean futimensSupported() {
return (capabilities & SUPPORTS_FUTIMENS) != 0;
}
/**
* Supports lutimes
*/

30
src/java.base/unix/native/libnio/fs/UnixNativeDispatcher.c
View file

@ -143,6 +143,7 @@ typedef int fstatat64_func(int, const char *, struct stat64 *, int);
typedef int unlinkat_func(int, const char*, int);
typedef int renameat_func(int, const char*, int, const char*);
typedef int futimesat_func(int, const char *, const struct timeval *);
typedef int futimens_func(int, const struct timespec *);
typedef int lutimes_func(const char *, const struct timeval *);
typedef DIR* fdopendir_func(int);
@ -151,6 +152,7 @@ static fstatat64_func* my_fstatat64_func = NULL;
static unlinkat_func* my_unlinkat_func = NULL;
static renameat_func* my_renameat_func = NULL;
static futimesat_func* my_futimesat_func = NULL;
static futimens_func* my_futimens_func = NULL;
static lutimes_func* my_lutimes_func = NULL;
static fdopendir_func* my_fdopendir_func = NULL;
@ -275,6 +277,7 @@ Java_sun_nio_fs_UnixNativeDispatcher_init(JNIEnv* env, jclass this)
my_futimesat_func = (futimesat_func*) dlsym(RTLD_DEFAULT, "futimesat");
my_lutimes_func = (lutimes_func*) dlsym(RTLD_DEFAULT, "lutimes");
#endif
my_futimens_func = (futimens_func*) dlsym(RTLD_DEFAULT, "futimens");
#if defined(_AIX)
my_fdopendir_func = (fdopendir_func*) dlsym(RTLD_DEFAULT, "fdopendir64");
#else
@ -287,7 +290,7 @@ Java_sun_nio_fs_UnixNativeDispatcher_init(JNIEnv* env, jclass this)
my_fstatat64_func = (fstatat64_func*)&fstatat64_wrapper;
#endif
/* supports futimes or futimesat and/or lutimes */
/* supports futimes or futimesat, futimens, and/or lutimes */
#ifdef _ALLBSD_SOURCE
capabilities |= sun_nio_fs_UnixNativeDispatcher_SUPPORTS_FUTIMES;
@ -298,6 +301,8 @@ Java_sun_nio_fs_UnixNativeDispatcher_init(JNIEnv* env, jclass this)
if (my_lutimes_func != NULL)
capabilities |= sun_nio_fs_UnixNativeDispatcher_SUPPORTS_LUTIMES;
#endif
if (my_futimens_func != NULL)
capabilities |= sun_nio_fs_UnixNativeDispatcher_SUPPORTS_FUTIMENS;
/* supports openat, etc. */
@ -693,6 +698,29 @@ Java_sun_nio_fs_UnixNativeDispatcher_futimes(JNIEnv* env, jclass this, jint file
}
}
JNIEXPORT void JNICALL
Java_sun_nio_fs_UnixNativeDispatcher_futimens(JNIEnv* env, jclass this, jint filedes,
jlong accessTime, jlong modificationTime)
{
struct timespec times[2];
int err = 0;
times[0].tv_sec = accessTime / 1000000000;
times[0].tv_nsec = accessTime % 1000000000;
times[1].tv_sec = modificationTime / 1000000000;
times[1].tv_nsec = modificationTime % 1000000000;
if (my_futimens_func == NULL) {
JNU_ThrowInternalError(env, "my_futimens_func is NULL");
return;
}
RESTARTABLE((*my_futimens_func)(filedes, &times[0]), err);
if (err == -1) {
throwUnixException(env, errno);
}
}
JNIEXPORT void JNICALL
Java_sun_nio_fs_UnixNativeDispatcher_lutimes0(JNIEnv* env, jclass this,
jlong pathAddress, jlong accessTime, jlong modificationTime)