sync() not implemented by rumpfs
a3an at ...294...
Fri Jan 30 10:56:45 CET 2015
I've got some new indications.
I used the fsync() call to see how that worked out.
It did not work either. By plowing through the vfs header files, I noticed
that File_system contains a virtual function called sync() followed by
some comments that only Fs_file_system needs sync.
I placed a PWRN macro call with a msg within the braces and run the test
The msg appeared on the console.
It means there is no overriding implementation for sync(), presumably in
I assume rump_fs has been used in read mode only.
Am 29.01.2015 um 23:40 schrieb Josef Söntgen:
> Hello Adrian,
> * a3an <a3an at ...294...> [2015-01-29 22:03:44 +0100]:
>> while experimenting with rumpfs I noticed that sync() is not supported
>> by rumpfs.
>> I added a sync() call in ../test/libc_ffat/main.cc and executed make
>> run/rump_ext2. I got the following message:
>> [init -> test-libc_vfs] DUMMY sync(): sync called, not implemented
>> I guess, a filesystem not supporting sync() is of greatly reduced value.
> rump_fs actually does support syncing (you may take a look at ).
> However, sync(2) is only implemented as a dummy function call  in
> the common libc backend, hence this message. Looking at the current
> implementation, calling fsync(3) would have the desired effect .
> (It will call the sync method on the root directory, which is a
> Dir_file_system, that in return will call sync on all its registered
> file systems and so.)
>> Has this call been blocked on purpose ?
> No, it just was not implemented. I vaguely remember talking about this
> topic, when we added the sync syscall to Noux. Since we override the
> common libc implementation in libc_noux  anyway, there was probably
> no immediate need to also provide a more complete implementation there.
>  repos/dde_rump/src/server/rump_fs/main.cc:325
>  repos/libports/src/lib/libc/dummies:136
>  repos/libports/src/lib/libc/vfs_lugin.cc:829
>  repos/ports/src/lib/libc_noux/plugin.cc:635
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