ExternalVendorCode/genode
1
0
Fork 0
mirror of https://github.com/genodelabs/genode.git synced 2024-12-20 06:07:59 +00:00
Code Issues Actions Packages Projects Releases Wiki Activity

Noux: implement 'Fs_file_system::dataspace()'

Browse Source 
Fixes #261.
This commit is contained in:
Christian Prochaska 2012-07-24 12:40:37 +02:00 committed by Norman Feske
parent 7e0a1cc0eb
commit f99648f355
1 changed files with 67 additions and 1 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

68
ports/src/noux/fs_file_system.h
View File

@ -103,11 +103,77 @@ namespace Noux {
Dataspace_capability dataspace(char const *path)
{
return Dataspace_capability();
Lock::Guard guard(_lock);
Absolute_path dir_path(path);
dir_path.strip_last_element();
Absolute_path file_name(path);
file_name.keep_only_last_element();
Ram_dataspace_capability ds_cap;
char *local_addr = 0;
try {
::File_system::Dir_handle dir = _fs.dir(dir_path.base(),
false);
Fs_handle_guard dir_guard(_fs, dir);
::File_system::File_handle file =
_fs.file(dir, file_name.base() + 1,
::File_system::READ_ONLY, false);
Fs_handle_guard file_guard(_fs, file);
::File_system::Status status = _fs.status(file);
Ram_dataspace_capability ds_cap =
env()->ram_session()->alloc(status.size);
local_addr = env()->rm_session()->attach(ds_cap);
::File_system::Session::Tx::Source &source = *_fs.tx();
size_t const max_packet_size = source.bulk_buffer_size() / 2;
for (size_t seek_offset = 0; seek_offset < status.size;
seek_offset += max_packet_size) {
size_t const count = min(max_packet_size, status.size - seek_offset);
::File_system::Packet_descriptor
packet(source.alloc_packet(count),
0,
file,
::File_system::Packet_descriptor::READ,
count,
seek_offset);
/* pass packet to server side */
source.submit_packet(packet);
source.get_acked_packet();
memcpy(local_addr + seek_offset, source.packet_content(packet), count);
/*
* XXX check if acked packet belongs to request,
* needed for thread safety
*/
source.release_packet(packet);
}
env()->rm_session()->detach(local_addr);
return ds_cap;
} catch(...) {
env()->rm_session()->detach(local_addr);
env()->ram_session()->free(ds_cap);
return Dataspace_capability();
}
}
void release(char const *path, Dataspace_capability ds_cap)
{
env()->ram_session()->free(static_cap_cast<Ram_dataspace>(ds_cap));
}
bool stat(Sysio *sysio, char const *path)