/*! Duplicates an FD from another team to this/the kernel team.
\param fromTeam The team which owns the FD.
\param fd The FD to duplicate.
\param kernel If \c true, the new FD will be created in the kernel team,
the current userland team otherwise.
\return The newly created FD or an error code, if something went wrong.
*/
int
dup_foreign_fd(team_id fromTeam, int fd, bool kernel)
{
// get the I/O context for the team in question
Team* team = Team::Get(fromTeam);
if (team == NULL)
return B_BAD_TEAM_ID;
BReference<Team> teamReference(team, true);
io_context* fromContext = team->io_context;
// get the file descriptor
file_descriptor* descriptor = get_fd(fromContext, fd);
if (descriptor == NULL)
return B_FILE_ERROR;
CObjectDeleter<file_descriptor> descriptorPutter(descriptor, put_fd);
// create a new FD in the target I/O context
int result = new_fd(get_current_io_context(kernel), descriptor);
if (result >= 0) {
// the descriptor reference belongs to the slot, now
descriptorPutter.Detach();
}
return result;
}
/*! Duplicates an FD from another team to this/the kernel team.
\param fromTeam The team which owns the FD.
\param fd The FD to duplicate.
\param kernel If \c true, the new FD will be created in the kernel team,
the current userland team otherwise.
\return The newly created FD or an error code, if something went wrong.
*/
int
dup_foreign_fd(team_id fromTeam, int fd, bool kernel)
{
// get the I/O context for the team in question
InterruptsSpinLocker teamsLocker(gTeamSpinlock);
struct team* team = team_get_team_struct_locked(fromTeam);
if (team == NULL)
return B_BAD_TEAM_ID;
io_context* fromContext = team->io_context;
vfs_get_io_context(fromContext);
teamsLocker.Unlock();
CObjectDeleter<io_context> _(fromContext, vfs_put_io_context);
// get the file descriptor
file_descriptor* descriptor = get_fd(fromContext, fd);
if (descriptor == NULL)
return B_FILE_ERROR;
CObjectDeleter<file_descriptor> descriptorPutter(descriptor, put_fd);
// create a new FD in the target I/O context
int result = new_fd(get_current_io_context(kernel), descriptor);
if (result >= 0) {
// the descriptor reference belongs to the slot, now
descriptorPutter.Detach();
}
return result;
}
status_t
do_fd_io(int fd, io_request* request)
{
struct vnode* vnode;
file_descriptor* descriptor = get_fd_and_vnode(fd, &vnode, true);
if (descriptor == NULL) {
request->SetStatusAndNotify(B_FILE_ERROR);
return B_FILE_ERROR;
}
CObjectDeleter<file_descriptor> descriptorPutter(descriptor, put_fd);
return vfs_vnode_io(vnode, descriptor->cookie, request);
}
status_t
do_iterative_fd_io(int fd, io_request* request, iterative_io_get_vecs getVecs,
iterative_io_finished finished, void* cookie)
{
TRACE_RIO("[%" B_PRId32 "] do_iterative_fd_io(fd: %d, request: %p "
"(offset: %" B_PRIdOFF ", length: %" B_PRIuGENADDR "))\n",
find_thread(NULL), fd, request, request->Offset(), request->Length());
struct vnode* vnode;
file_descriptor* descriptor = get_fd_and_vnode(fd, &vnode, true);
if (descriptor == NULL) {
finished(cookie, request, B_FILE_ERROR, true, 0);
request->SetStatusAndNotify(B_FILE_ERROR);
return B_FILE_ERROR;
}
CObjectDeleter<file_descriptor> descriptorPutter(descriptor, put_fd);
if (!HAS_FS_CALL(vnode, io)) {
// no io() call -- fall back to synchronous I/O
return do_synchronous_iterative_vnode_io(vnode, descriptor->cookie,
request, getVecs, finished, cookie);
}
iterative_io_cookie* iterationCookie
= (request->Flags() & B_VIP_IO_REQUEST) != 0
? new(malloc_flags(HEAP_PRIORITY_VIP)) iterative_io_cookie
: new(std::nothrow) iterative_io_cookie;
if (iterationCookie == NULL) {
// no memory -- fall back to synchronous I/O
return do_synchronous_iterative_vnode_io(vnode, descriptor->cookie,
request, getVecs, finished, cookie);
}
iterationCookie->vnode = vnode;
iterationCookie->descriptor = descriptor;
iterationCookie->get_vecs = getVecs;
iterationCookie->finished = finished;
iterationCookie->cookie = cookie;
iterationCookie->request_offset = request->Offset();
iterationCookie->next_finished_callback = request->FinishedCallback(
&iterationCookie->next_finished_cookie);
request->SetFinishedCallback(&do_iterative_fd_io_finish, iterationCookie);
request->SetIterationCallback(&do_iterative_fd_io_iterate, iterationCookie);
descriptorPutter.Detach();
// From now on the descriptor is put by our finish callback.
bool partialTransfer = false;
status_t error = do_iterative_fd_io_iterate(iterationCookie, request,
&partialTransfer);
if (error != B_OK || partialTransfer) {
if (partialTransfer) {
request->SetTransferredBytes(partialTransfer,
request->TransferredBytes());
}
request->SetStatusAndNotify(error);
return error;
}
return B_OK;
}
