source: trunk/server/source4/ntvfs/posix/pvfs_aio.c

Last change on this file was 414, checked in by Herwig Bauernfeind, 15 years ago

Samba 3.5.0: Initial import
File size: 4.2 KB
Line 
1/*
2 Unix SMB/CIFS implementation.
3
4 POSIX NTVFS backend - Linux AIO calls
5
6 Copyright (C) Andrew Tridgell 2006
7
8 This program is free software; you can redistribute it and/or modify
9 it under the terms of the GNU General Public License as published by
10 the Free Software Foundation; either version 3 of the License, or
11 (at your option) any later version.
12
13 This program is distributed in the hope that it will be useful,
14 but WITHOUT ANY WARRANTY; without even the implied warranty of
15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 GNU General Public License for more details.
17
18 You should have received a copy of the GNU General Public License
19 along with this program. If not, see <http://www.gnu.org/licenses/>.
20*/
21
22#include "includes.h"
23#include <tevent.h>
24#include "vfs_posix.h"
25#include "system/aio.h"
26
27struct pvfs_aio_read_state {
28 struct ntvfs_request *req;
29 union smb_read *rd;
30 struct pvfs_file *f;
31 struct tevent_aio *ae;
32};
33
34struct pvfs_aio_write_state {
35 struct ntvfs_request *req;
36 union smb_write *wr;
37 struct pvfs_file *f;
38 struct tevent_aio *ae;
39};
40
41/*
42 called when an aio read has finished
43*/
44static void pvfs_aio_read_handler(struct tevent_context *ev, struct tevent_aio *ae,
45 int ret, void *private_data)
46{
47 struct pvfs_aio_read_state *state = talloc_get_type(private_data,
48 struct pvfs_aio_read_state);
49 struct pvfs_file *f = state->f;
50 union smb_read *rd = state->rd;
51
52 if (ret < 0) {
53 /* errno is -ret on error */
54 state->req->async_states->status = pvfs_map_errno(f->pvfs, -ret);
55 state->req->async_states->send_fn(state->req);
56 return;
57 }
58
59 f->handle->position = f->handle->seek_offset = rd->readx.in.offset + ret;
60
61 rd->readx.out.nread = ret;
62 rd->readx.out.remaining = 0xFFFF;
63 rd->readx.out.compaction_mode = 0;
64
65 talloc_steal(ev, state->ae);
66
67 state->req->async_states->status = NT_STATUS_OK;
68 state->req->async_states->send_fn(state->req);
69}
70
71
72/*
73 read from a file
74*/
75NTSTATUS pvfs_aio_pread(struct ntvfs_request *req, union smb_read *rd,
76 struct pvfs_file *f, uint32_t maxcnt)
77{
78 struct iocb iocb;
79 struct pvfs_aio_read_state *state;
80
81 state = talloc(req, struct pvfs_aio_read_state);
82 NT_STATUS_HAVE_NO_MEMORY(state);
83
84 io_prep_pread(&iocb, f->handle->fd, rd->readx.out.data,
85 maxcnt, rd->readx.in.offset);
86 state->ae = tevent_add_aio(req->ctx->event_ctx, req->ctx->event_ctx, &iocb,
87 pvfs_aio_read_handler, state);
88 if (state->ae == NULL) {
89 DEBUG(0,("Failed tevent_add_aio\n"));
90 talloc_free(state);
91 return NT_STATUS_NOT_IMPLEMENTED;
92 }
93
94 state->req = req;
95 state->rd = rd;
96 state->f = f;
97
98 req->async_states->state |= NTVFS_ASYNC_STATE_ASYNC;
99
100 return NT_STATUS_OK;
101}
102
103
104
105
106/*
107 called when an aio write has finished
108*/
109static void pvfs_aio_write_handler(struct tevent_context *ev, struct tevent_aio *ae,
110 int ret, void *private_data)
111{
112 struct pvfs_aio_write_state *state = talloc_get_type(private_data,
113 struct pvfs_aio_write_state);
114 struct pvfs_file *f = state->f;
115 union smb_write *wr = state->wr;
116
117 if (ret < 0) {
118 /* errno is -ret on error */
119 state->req->async_states->status = pvfs_map_errno(f->pvfs, -ret);
120 state->req->async_states->send_fn(state->req);
121 return;
122 }
123
124 f->handle->seek_offset = wr->writex.in.offset + ret;
125
126 wr->writex.out.nwritten = ret;
127 wr->writex.out.remaining = 0;
128
129 talloc_steal(ev, state->ae);
130
131 state->req->async_states->status = NT_STATUS_OK;
132 state->req->async_states->send_fn(state->req);
133}
134
135
136/*
137 write to a file
138*/
139NTSTATUS pvfs_aio_pwrite(struct ntvfs_request *req, union smb_write *wr,
140 struct pvfs_file *f)
141{
142 struct iocb iocb;
143 struct pvfs_aio_write_state *state;
144
145 state = talloc(req, struct pvfs_aio_write_state);
146 NT_STATUS_HAVE_NO_MEMORY(state);
147
148 io_prep_pwrite(&iocb, f->handle->fd, discard_const(wr->writex.in.data),
149 wr->writex.in.count, wr->writex.in.offset);
150 state->ae = tevent_add_aio(req->ctx->event_ctx, req->ctx->event_ctx, &iocb,
151 pvfs_aio_write_handler, state);
152 if (state->ae == NULL) {
153 DEBUG(0,("Failed tevent_add_aio\n"));
154 talloc_free(state);
155 return NT_STATUS_NOT_IMPLEMENTED;
156 }
157
158 state->req = req;
159 state->wr = wr;
160 state->f = f;
161
162 req->async_states->state |= NTVFS_ASYNC_STATE_ASYNC;
163
164 return NT_STATUS_OK;
165}
166
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