I solved the invalid write, but I am still stuck on the syncing.
Apparently I needed to use the fs tied to the `handle` like so:
```cpp
handle->fs().write(handle, bufrange, out);
```
So now I focused on the actual syncing, so I added the following:
```cpp
handle->fs().queue_sync(handle);
auto res = handle->fs().complete_sync(handle);
while (res == Vfs::File_io_service::SYNC_QUEUED) {
root_dir.commit_and_wait();
}
```
With `root_dir` being the following:
```cpp
Genode::Root_directory root_dir = rom.node().with_sub_node(
"vfs",
[&](const Genode::Node &config) -> Genode::Root_directory {
return {env, heap, config};
},
[&]() -> Genode::Root_directory {
Genode::error(
"VFS was not configured properly: missing <vfs> under <config>");
return {env, heap, Genode::Node()};
});
```
The first file gets written to disk, however, after that the program blocks
again and
no more writes are started. Am I handling the sync correctly?
Best,
Rumen
________________________________________
From: Rumen Mitov via users <[email protected]>
Sent: Tuesday, June 23, 2026 7:28 PM
To: Ryan Davidovics via users
Cc: Rumen Mitov
Subject: How to Explicitly Sync When Appending to a File
CAUTION: This email originated from outside the organization. Do not click
links or open attachments unless you recognize the sender and know the content
is safe.
Hello,
I would like to sync the file-system after every invocation to
`Genode::Append_file::append()`.
However, the `_sync()` interface is private as are the Genode::Append_file's
`_io` and `_handle`.
What is the recommended way to sync?
I tried using handles as well:
```cpp
Vfs::File_system &fs{root_dir.root_dir()};
Vfs::Vfs_handle *handle {};
fs.open("foo",
Vfs::Directory_service::Open_mode::OPEN_MODE_RDWR |
Vfs::Directory_service::Open_mode::OPEN_MODE_CREATE,
&handle, heap);
// file opens properly
for (long long unsigned i = 0; i < 10; i++) {
auto _str = Genode::String<512>(Genode::Hex(i), "\n");
Genode::Const_byte_range_ptr const bufrange { _str.string(),
_str.length() };
Genode::size_t out = 0;
auto res = fs.write(handle, bufrange, out);
handle->advance_seek(out);
Genode::warning("WROTE: ", out, "B, RES: ", (Genode::uint32_t)res);
}
fs.close(handle);
```
However, before I could add syncing to the above example, I noticed that
`fs.write()`
returns WRITE_ERR_INVALID. I am stuck on what could be wrong, as I based this
example off of the
internal implementation of `Genode::Writeable_file`.
As always, any help is greatly appreciated :)
Best,
Rumen
P.S. This was tested on rump-ext2fs.
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