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LxIP: propagate write errors using SYNC_ERR_INVALID

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The libc sockets implementation already syncs socket control files after
writes, so sync errors will induce failures for operations such as
"connect".

Fix #2920
This commit is contained in:
Emery Hemingway 2018-07-23 19:56:25 +02:00 committed by Christian Helmuth
parent 08b774e318
commit a7e5d4ef03
1 changed files with 34 additions and 10 deletions
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44
repos/dde_linux/src/lib/vfs/lxip/vfs.cc
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@ -195,6 +195,9 @@ struct Vfs::File : Vfs::Node
Genode::error(name(), " not readable");
return -1;
}
virtual File_io_service::Sync_result sync() {
return File_io_service::Sync_result::SYNC_OK; }
};
@ -256,6 +259,7 @@ struct Vfs::Lxip_vfs_handle : Vfs::Vfs_handle
{
typedef File_io_service:: Read_result Read_result;
typedef File_io_service::Write_result Write_result;
typedef File_io_service::Sync_result Sync_result;
Lxip_vfs_handle(Vfs::File_system &fs, Allocator &alloc, int status_flags)
: Vfs::Vfs_handle(fs, fs, alloc, status_flags) { }
@ -267,6 +271,8 @@ struct Vfs::Lxip_vfs_handle : Vfs::Vfs_handle
virtual Write_result write(char const *src,
file_size count, file_size &out_count) = 0;
virtual Sync_result sync() {
return Sync_result::SYNC_OK; }
};
@ -327,6 +333,9 @@ struct Vfs::Lxip_vfs_file_handle final : Vfs::Lxip_vfs_handle
content_buffer[len+1] = '\0';
return true;
}
virtual Sync_result sync() override {
return (file) ? file->sync() : Sync_result::SYNC_ERR_INVALID; }
};
@ -386,6 +395,8 @@ class Vfs::Lxip_file : public Vfs::File
Lxip::Socket_dir &_parent;
Linux::socket &_sock;
int _write_err = 0;
bool _sock_valid() { return _sock.sk != nullptr; }
public:
@ -409,6 +420,13 @@ class Vfs::Lxip_file : public Vfs::File
le = handles.first();
}
}
File_io_service::Sync_result sync() override
{
return (_write_err)
? File_io_service::Sync_result::SYNC_ERR_INVALID
: File_io_service::Sync_result::SYNC_OK;
}
};
@ -451,7 +469,8 @@ class Vfs::Lxip_data_file : public Vfs::Lxip_file
msghdr msg = create_msghdr(&_parent.remote_addr(),
sizeof(sockaddr_in), len, &iov);
return _sock.ops->sendmsg(&_sock, &msg, len);
_write_err = _sock.ops->sendmsg(&_sock, &msg, len);
return _write_err;
}
Lxip::ssize_t read(Lxip_vfs_file_handle &,
@ -519,8 +538,8 @@ class Vfs::Lxip_bind_file : public Vfs::Lxip_file
addr->sin_addr.s_addr = get_addr(handle.content_buffer);
addr->sin_family = AF_INET;
int res = _sock.ops->bind(&_sock, (sockaddr*)addr, sizeof(addr_storage));
if (res != 0) return -1;
_write_err = _sock.ops->bind(&_sock, (sockaddr*)addr, sizeof(addr_storage));
if (_write_err != 0) return -1;
_port = port;
@ -572,15 +591,13 @@ class Vfs::Lxip_listen_file : public Vfs::Lxip_file
if (!handle.write_content_line(src, len)) return -1;
Lxip::ssize_t res;
Genode::ascii_to_unsigned(
handle.content_buffer, _backlog, sizeof(handle.content_buffer));
if (_backlog == ~0UL) return -1;
res = _sock.ops->listen(&_sock, _backlog);
if (res != 0) {
_write_err = _sock.ops->listen(&_sock, _backlog);
if (_write_err != 0) {
handle.write_content_line("", 0);
return -1;
}
@ -637,9 +654,9 @@ class Vfs::Lxip_connect_file : public Vfs::Lxip_file
addr->sin_addr.s_addr = get_addr(handle.content_buffer);
addr->sin_family = AF_INET;
int res = _sock.ops->connect(&_sock, (sockaddr *)addr, sizeof(addr_storage), 0);
_write_err = _sock.ops->connect(&_sock, (sockaddr *)addr, sizeof(addr_storage), 0);
switch (res) {
switch (_write_err) {
case Lxip::Io_result::LINUX_EINPROGRESS:
_connecting = true;
return -1;
@ -658,7 +675,7 @@ class Vfs::Lxip_connect_file : public Vfs::Lxip_file
break;
default:
if (res != 0) return -1;
if (_write_err != 0) return -1;
break;
}
@ -1883,6 +1900,13 @@ class Vfs::Lxip_file_system : public Vfs::File_system,
*static_cast<Lxip_vfs_handle *>(vfs_handle);
return handle.read_ready();
}
Sync_result complete_sync(Vfs_handle *vfs_handle)
{
Vfs::Lxip_vfs_handle *handle =
static_cast<Vfs::Lxip_vfs_handle*>(vfs_handle);
return handle->sync();
}
};