From 6aa9095865017c06a61f0cb10c1f1231a89b761c Mon Sep 17 00:00:00 2001
From: Benjamin Barenblat <bbaren@mit.edu>
Date: Sun, 21 Feb 2016 19:23:11 -0500
Subject: Implement fgetattr and read

---
 src/operations.cc | 33 +++++++++++++++++++++++++++++++++
 1 file changed, 33 insertions(+)

(limited to 'src/operations.cc')

diff --git a/src/operations.cc b/src/operations.cc
index 355ffc3..897b193 100644
--- a/src/operations.cc
+++ b/src/operations.cc
@@ -25,8 +25,10 @@
 #include <new>
 #include <system_error>
 #include <type_traits>
+#include <vector>
 
 #include <dirent.h>
+#include <fcntl.h>
 #include <glog/logging.h>
 #include <sys/stat.h>
 #include <sys/types.h>
@@ -75,6 +77,19 @@ int Getattr(const char* const path, struct stat* output) noexcept {
   }
 }
 
+int Fgetattr(const char*, struct stat* const output,
+             struct fuse_file_info* const file_info) noexcept {
+  try {
+    *output = reinterpret_cast<File*>(file_info->fh)->Stat();
+    return 0;
+  } catch (const std::system_error& e) {
+    return -e.code().value();
+  } catch (...) {
+    LOG(ERROR) << "getattr: caught unexpected value";
+    return -ENOTRECOVERABLE;
+  }
+}
+
 template <typename T>
 int OpenResource(const char* const path, const int flags,
                  uint64_t* const handle) noexcept {
@@ -131,6 +146,22 @@ int Open(const char* const path, fuse_file_info* const file_info) noexcept {
   return OpenResource<File>(path, file_info->flags, &file_info->fh);
 }
 
+int Read(const char*, char* const buffer, const size_t bytes,
+         const off_t offset, fuse_file_info* const file_info) noexcept {
+  LOG(INFO) << "read with offset " << offset;
+  try {
+    auto* const file = reinterpret_cast<File*>(file_info->fh);
+    const std::vector<std::uint8_t> read = file->Read(offset, bytes);
+    std::memcpy(buffer, read.data(), read.size());
+    return static_cast<int>(read.size());
+  } catch (const std::system_error& e) {
+    return -e.code().value();
+  } catch (...) {
+    LOG(ERROR) << "read: caught unexpected value";
+    return -ENOTRECOVERABLE;
+  }
+}
+
 int Utimens(const char* const path, const timespec times[2]) noexcept {
   try {
     root_->UTimeNs(
@@ -230,9 +261,11 @@ fuse_operations FuseOperations(File* const root) {
   result.destroy = &Destroy;
 
   result.getattr = &Getattr;
+  result.fgetattr = &Fgetattr;
 
   result.mknod = &Mknod;
   result.open = &Open;
+  result.read = &Read;
   result.utimens = &Utimens;
   result.release = &Release;
   result.unlink = &Unlink;
-- 
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