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8343417: (fs) BasicFileAttributeView.setTimes uses microsecond precision with NOFOLLOW_LINKS

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Reviewed-by: alanb
This commit is contained in:
Brian Burkhalter 2024-11-07 17:19:27 +00:00
parent d3c042f9a0
commit 56c588b4e8
5 changed files with 141 additions and 25 deletions
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6
src/java.base/unix/classes/sun/nio/fs/UnixConstants.java.template
View file

@ -1,5 +1,5 @@
/*
* Copyright (c) 2008, 2023, Oracle and/or its affiliates. All rights reserved.
* Copyright (c) 2008, 2024, 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
@ -139,11 +139,13 @@ class UnixConstants {
#endif
// flags used with openat/unlinkat/etc.
#if defined(AT_SYMLINK_NOFOLLOW) && defined(AT_REMOVEDIR)
#if defined(AT_FDCWD) && defined(AT_SYMLINK_NOFOLLOW) && defined(AT_REMOVEDIR)
static final int PREFIX_AT_FDCWD = AT_FDCWD;
static final int PREFIX_AT_SYMLINK_NOFOLLOW = AT_SYMLINK_NOFOLLOW;
static final int PREFIX_AT_REMOVEDIR = AT_REMOVEDIR;
#else
// not supported (dummy values will not be used at runtime).
static final int PREFIX_AT_FDCWD = 00;
static final int PREFIX_AT_SYMLINK_NOFOLLOW = 00;
static final int PREFIX_AT_REMOVEDIR = 00;
#endif

25
src/java.base/unix/classes/sun/nio/fs/UnixFileAttributeViews.java
View file

@ -1,5 +1,5 @@
/*
* Copyright (c) 2008, 2023, Oracle and/or its affiliates. All rights reserved.
* Copyright (c) 2008, 2024, 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
@ -76,13 +76,16 @@ class UnixFileAttributeViews {
boolean useFutimes = false;
boolean useFutimens = false;
boolean useLutimes = false;
boolean useUtimensat = false;
int fd = -1;
try {
if (!followLinks) {
useLutimes = lutimesSupported() &&
UnixFileAttributes.get(file, false).isSymbolicLink();
// these path-based syscalls also work if following links
if (!(useUtimensat = utimensatSupported())) {
useLutimes = lutimesSupported();
}
}
if (!useLutimes) {
if (!useUtimensat && !useLutimes) {
fd = file.openForAttributeAccess(followLinks);
if (fd != -1) {
haveFd = true;
@ -92,8 +95,8 @@ class UnixFileAttributeViews {
}
}
} catch (UnixException x) {
if (!(x.errno() == UnixConstants.ENXIO ||
(x.errno() == UnixConstants.ELOOP && useLutimes))) {
if (!(x.errno() == ENXIO ||
(x.errno() == ELOOP && (useUtimensat || useLutimes)))) {
x.rethrowAsIOException(file);
}
}
@ -117,7 +120,7 @@ class UnixFileAttributeViews {
}
// update times
TimeUnit timeUnit = useFutimens ?
TimeUnit timeUnit = (useFutimens || useUtimensat) ?
TimeUnit.NANOSECONDS : TimeUnit.MICROSECONDS;
long modValue = lastModifiedTime.to(timeUnit);
long accessValue= lastAccessTime.to(timeUnit);
@ -130,13 +133,16 @@ class UnixFileAttributeViews {
futimes(fd, accessValue, modValue);
} else if (useLutimes) {
lutimes(file, accessValue, modValue);
} else if (useUtimensat) {
utimensat(AT_FDCWD, file, accessValue, modValue,
followLinks ? 0 : AT_SYMLINK_NOFOLLOW);
} else {
utimes(file, accessValue, modValue);
}
} catch (UnixException x) {
// if futimes/utimes fails with EINVAL and one/both of the times is
// negative then we adjust the value to the epoch and retry.
if (x.errno() == UnixConstants.EINVAL &&
if (x.errno() == EINVAL &&
(modValue < 0L || accessValue < 0L)) {
retry = true;
} else {
@ -153,6 +159,9 @@ class UnixFileAttributeViews {
futimes(fd, accessValue, modValue);
} else if (useLutimes) {
lutimes(file, accessValue, modValue);
} else if (useUtimensat) {
utimensat(AT_FDCWD, file, accessValue, modValue,
followLinks ? 0 : AT_SYMLINK_NOFOLLOW);
} else {
utimes(file, accessValue, modValue);
}

24
src/java.base/unix/classes/sun/nio/fs/UnixNativeDispatcher.java
View file

@ -391,6 +391,20 @@ class UnixNativeDispatcher {
private static native void lutimes0(long pathAddress, long times0, long times1)
throws UnixException;
/**
* utimensat(int fd, const char* path,
* const struct timeval times[2], int flags)
*/
static void utimensat(int fd, UnixPath path, long times0, long times1, int flags)
throws UnixException
{
try (NativeBuffer buffer = copyToNativeBuffer(path)) {
utimensat0(fd, buffer.address(), times0, times1, flags);
}
}
private static native void utimensat0(int fd, long pathAddress, long times0, long times1, int flags)
throws UnixException;
/**
* DIR *opendir(const char* dirname)
*/
@ -557,7 +571,8 @@ class UnixNativeDispatcher {
private static final int SUPPORTS_FUTIMES = 1 << 2;
private static final int SUPPORTS_FUTIMENS = 1 << 3;
private static final int SUPPORTS_LUTIMES = 1 << 4;
private static final int SUPPORTS_XATTR = 1 << 5;
private static final int SUPPORTS_UTIMENSAT = 1 << 5;
private static final int SUPPORTS_XATTR = 1 << 6;
private static final int SUPPORTS_BIRTHTIME = 1 << 16; // other features
private static final int capabilities;
@ -589,6 +604,13 @@ class UnixNativeDispatcher {
return (capabilities & SUPPORTS_LUTIMES) != 0;
}
/**
* Supports utimensat
*/
static boolean utimensatSupported() {
return (capabilities & SUPPORTS_UTIMENSAT) != 0;
}
/**
* Supports file birth (creation) time attribute
*/

35
src/java.base/unix/native/libnio/fs/UnixNativeDispatcher.c
View file

@ -211,6 +211,8 @@ typedef DIR* fdopendir_func(int);
#if defined(__linux__)
typedef int statx_func(int dirfd, const char *restrict pathname, int flags,
unsigned int mask, struct my_statx *restrict statxbuf);
typedef int utimensat_func(int dirfd, const char *pathname,
const struct timespec[2], int flags);
#endif
static openat_func* my_openat_func = NULL;
@ -223,6 +225,7 @@ static lutimes_func* my_lutimes_func = NULL;
static fdopendir_func* my_fdopendir_func = NULL;
#if defined(__linux__)
static statx_func* my_statx_func = NULL;
static utimensat_func* my_utimensat_func = NULL;
#endif
/**
@ -432,6 +435,10 @@ Java_sun_nio_fs_UnixNativeDispatcher_init(JNIEnv* env, jclass this)
if (my_statx_func != NULL) {
capabilities |= sun_nio_fs_UnixNativeDispatcher_SUPPORTS_BIRTHTIME;
}
my_utimensat_func = (utimensat_func*) dlsym(RTLD_DEFAULT, "utimensat");
if (my_utimensat_func != NULL) {
capabilities |= sun_nio_fs_UnixNativeDispatcher_SUPPORTS_UTIMENSAT;
}
#endif
/* supports extended attributes */
@ -976,6 +983,34 @@ Java_sun_nio_fs_UnixNativeDispatcher_lutimes0(JNIEnv* env, jclass this,
}
}
JNIEXPORT void JNICALL
Java_sun_nio_fs_UnixNativeDispatcher_utimensat0(JNIEnv* env, jclass this,
jint fd, jlong pathAddress, jlong accessTime, jlong modificationTime, jint flags) {
#if defined(__linux__)
int err;
struct timespec times[2];
const char* path = (const char*)jlong_to_ptr(pathAddress);
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_utimensat_func == NULL) {
JNU_ThrowInternalError(env, "my_utimensat_func is NULL");
return;
}
RESTARTABLE((*my_utimensat_func)(fd, path, &times[0], flags), err);
if (err == -1) {
throwUnixException(env, errno);
}
#else
JNU_ThrowInternalError(env, "should not reach here");
#endif
}
JNIEXPORT jlong JNICALL
Java_sun_nio_fs_UnixNativeDispatcher_opendir0(JNIEnv* env, jclass this,
jlong pathAddress)