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authorGravatar Benjamin Barenblat <bbaren@mit.edu>2016-02-21 19:22:26 -0500
committerGravatar Benjamin Barenblat <bbaren@mit.edu>2016-02-21 20:38:02 -0500
commit384f7c422acca2f3658393abfc16ea57cd74caa6 (patch)
tree97b225ee9a78141e4c1bedb63ec0e44f9f56f34c
parent05cafc5002360015a79484e6ee40c159b1c80958 (diff)
Implement utimens
-rw-r--r--src/operations.cc23
-rw-r--r--src/posix_extras.cc13
-rw-r--r--src/posix_extras.h7
3 files changed, 43 insertions, 0 deletions
diff --git a/src/operations.cc b/src/operations.cc
index df12738..355ffc3 100644
--- a/src/operations.cc
+++ b/src/operations.cc
@@ -30,6 +30,7 @@
#include <glog/logging.h>
#include <sys/stat.h>
#include <sys/types.h>
+#include <time.h>
#include "fuse.h"
#include "posix_extras.h"
@@ -130,6 +131,27 @@ int Open(const char* const path, fuse_file_info* const file_info) noexcept {
return OpenResource<File>(path, file_info->flags, &file_info->fh);
}
+int Utimens(const char* const path, const timespec times[2]) noexcept {
+ try {
+ root_->UTimeNs(
+ std::strcmp(path, "/") == 0
+ ?
+ // Update the times on the mount point.
+ "."
+ :
+ // Trim the leading slash so UTimeNs will treat it relative to
+ // root_.
+ path + 1,
+ times[0], times[1]);
+ return 0;
+ } catch (const std::system_error& e) {
+ return -e.code().value();
+ } catch (...) {
+ LOG(ERROR) << "utimens: caught unexpected value";
+ return -ENOTRECOVERABLE;
+ }
+}
+
int Release(const char*, fuse_file_info* const file_info) noexcept {
return ReleaseResource<File>(file_info->fh);
}
@@ -211,6 +233,7 @@ fuse_operations FuseOperations(File* const root) {
result.mknod = &Mknod;
result.open = &Open;
+ result.utimens = &Utimens;
result.release = &Release;
result.unlink = &Unlink;
diff --git a/src/posix_extras.cc b/src/posix_extras.cc
index f8274fb..7529251 100644
--- a/src/posix_extras.cc
+++ b/src/posix_extras.cc
@@ -14,6 +14,7 @@
#include "posix_extras.h"
+#include <array>
#include <cerrno>
#include <experimental/optional>
#include <stdexcept>
@@ -110,6 +111,18 @@ void File::UnlinkAt(const char* const path) const {
}
}
+void File::UTimeNs(const char* const path, const timespec& access,
+ const timespec& modification) const {
+ if (path[0] == '/') {
+ throw std::invalid_argument("absolute path");
+ }
+
+ std::array<const timespec, 2> times{{access, modification}};
+ if (utimensat(fd_, path, times.data(), AT_SYMLINK_NOFOLLOW) == -1) {
+ throw SystemError();
+ }
+}
+
int File::Duplicate() const {
int result;
if ((result = dup(fd_)) == -1) {
diff --git a/src/posix_extras.h b/src/posix_extras.h
index 60b2284..a73f9fe 100644
--- a/src/posix_extras.h
+++ b/src/posix_extras.h
@@ -21,6 +21,7 @@
#include <dirent.h>
#include <sys/stat.h>
#include <sys/types.h>
+#include <time.h>
namespace scoville {
@@ -81,6 +82,12 @@ class File {
// must indeed be relative (i.e., it must not start with '/').
void UnlinkAt(const char* path) const;
+ // Sets the access and modification times of the file at the path relative to
+ // the file descriptor. The path must indeed be relative (i.e., it must not
+ // start with '/'). Does not follow symbolic links.
+ void UTimeNs(const char* path, const timespec& access,
+ const timespec& modification) const;
+
private:
File() {}