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/*
Unix SMB/CIFS implementation.
POSIX NTVFS backend - Linux AIO calls
Copyright (C) Andrew Tridgell 2006
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#include "includes.h"
#include "vfs_posix.h"
#include "lib/events/events.h"
#include "system/aio.h"
struct pvfs_aio_read_state {
struct ntvfs_request *req;
union smb_read *rd;
struct pvfs_file *f;
struct aio_event *ae;
};
/*
called when an aio read has finished
*/
static void pvfs_aio_handler(struct event_context *ev, struct aio_event *ae,
int ret, void *private)
{
struct pvfs_aio_read_state *state = talloc_get_type(private,
struct pvfs_aio_read_state);
struct pvfs_file *f = state->f;
union smb_read *rd = state->rd;
if (ret < 0) {
/* errno is -ret on error */
state->req->async_states->status = pvfs_map_errno(f->pvfs, -ret);
state->req->async_states->send_fn(state->req);
return;
}
f->handle->position = f->handle->seek_offset = rd->readx.in.offset + ret;
rd->readx.out.nread = ret;
rd->readx.out.remaining = 0xFFFF;
rd->readx.out.compaction_mode = 0;
talloc_steal(ev, state->ae);
state->req->async_states->status = NT_STATUS_OK;
state->req->async_states->send_fn(state->req);
}
/*
read from a file
*/
NTSTATUS pvfs_aio_pread(struct ntvfs_request *req, union smb_read *rd,
struct pvfs_file *f, uint32_t maxcnt)
{
struct iocb iocb;
struct pvfs_aio_read_state *state;
state = talloc(req, struct pvfs_aio_read_state);
NT_STATUS_HAVE_NO_MEMORY(state);
io_prep_pread(&iocb, f->handle->fd, rd->readx.out.data,
maxcnt, rd->readx.in.offset);
state->ae = event_add_aio(req->ctx->event_ctx, req->ctx->event_ctx, &iocb,
pvfs_aio_handler, state);
if (state->ae == NULL) {
DEBUG(0,("Failed event_add_aio\n"));
talloc_free(state);
return NT_STATUS_NOT_IMPLEMENTED;
}
state->req = req;
state->rd = rd;
state->f = f;
req->async_states->state |= NTVFS_ASYNC_STATE_ASYNC;
return NT_STATUS_OK;
}
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