int FuseLink::write(const char *path, const char *in, size_t length,
off_t offset, struct fuse_file_info *options)
{
FuseLink::filesystem->setuid(fuse_get_context()->uid);
FuseLink::filesystem->setgid(fuse_get_context()->gid);
// Write data to the file.
try
{
if (offset > MSIZE_FILE || ((uint64_t) offset + (uint64_t) length) > MSIZE_FILE)
return -EFBIG;
FuseLink::filesystem->touch(path, "cma");
FSFile file = FuseLink::filesystem->open(path);
file.seekp(offset);
file.write(in, length);
file.close();
if (file.fail() || file.bad())
return -EIO;
return length;
}
catch (std::exception& e)
{
return FuseLink::handleException(e, "write");
}
}
int FuseLink::read(const char *path, char *out, size_t length,
off_t offset, struct fuse_file_info *options)
{
FuseLink::filesystem->setuid(fuse_get_context()->uid);
FuseLink::filesystem->setgid(fuse_get_context()->gid);
// Read data from the file.
try
{
if (offset > MSIZE_FILE || ((uint64_t) offset + (uint64_t) length) > MSIZE_FILE)
return -EFBIG;
FuseLink::filesystem->touch(path, "a");
FSFile file = FuseLink::filesystem->open(path);
file.seekg(offset);
uint32_t read = file.read(out, length);
file.close();
if (file.fail() || file.bad())
return -EIO;
return read;
}
catch (std::exception& e)
{
return FuseLink::handleException(e, "read");
}
}
void FS::symlink(std::string linkPath, std::string targetPath)
{
auto configuration = [&](LowLevel::INode& buf)
{
};
this->performCreation(LowLevel::INodeType::INT_SYMLINK, linkPath, 0755, configuration);
// We just created the file, so if this fails then
// it's an internal inconsistency.
LowLevel::INode buf;
if (!this->retrievePathToINode(linkPath, buf))
throw Exception::FileNotFound();
try
{
FSFile f = this->filesystem->getFile(buf.inodeid);
f.open();
f.write(targetPath.c_str(), targetPath.length());
f.close();
if (f.fail() || f.bad())
throw Exception::InternalInconsistency();
}
catch (...)
{
// Delete the file from disk since we failed to
// write to it (at least in some manner). Then
// rethrow the exception.
this->unlink(linkPath);
throw;
}
}
void FS::truncate(std::string path, off_t size)
{
if (size > MSIZE_FILE)
throw Exception::FileTooBig();
this->ensurePathExists(path);
LowLevel::INode buf;
if (!this->retrievePathToINode(path, buf))
throw Exception::FileNotFound();
this->touchINode(buf, "cma");
this->saveINode(buf);
// Truncate the file to the desired size.
FSFile file = this->filesystem->getFile(buf.inodeid);
file.open();
file.truncate(size);
file.close();
if (file.fail() || file.bad())
throw Exception::InternalInconsistency();
}
