Annotation of sys/xfs/xfs_dev-bsd.c, Revision 1.1.1.1
1.1 nbrk 1: /* $OpenBSD: xfs_dev-bsd.c,v 1.10 2004/01/18 21:46:54 beck Exp $
2:
3: * Copyright (c) 2004 Bob Beck
4: * Copyright (c) 1995 - 2003 Kungliga Tekniska Högskolan
5: * (Royal Institute of Technology, Stockholm, Sweden).
6: * All rights reserved.
7: *
8: * Redistribution and use in source and binary forms, with or without
9: * modification, are permitted provided that the following conditions
10: * are met:
11: *
12: * 1. Redistributions of source code must retain the above copyright
13: * notice, this list of conditions and the following disclaimer.
14: *
15: * 2. Redistributions in binary form must reproduce the above copyright
16: * notice, this list of conditions and the following disclaimer in the
17: * documentation and/or other materials provided with the distribution.
18: *
19: * 3. Neither the name of the Institute nor the names of its contributors
20: * may be used to endorse or promote products derived from this software
21: * without specific prior written permission.
22: *
23: * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
24: * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
25: * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
26: * ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
27: * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
28: * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
29: * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
30: * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
31: * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
32: * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
33: * SUCH DAMAGE.
34: */
35:
36: #include <xfs/xfs_locl.h>
37: #include <xfs/xfs_message.h>
38: #include <xfs/xfs_msg_locl.h>
39: #include <xfs/xfs_fs.h>
40: #include <xfs/xfs_dev.h>
41: #include <xfs/xfs_deb.h>
42:
43: int
44: xfs_devopen(dev_t dev, int flag, int devtype, d_thread_t *proc)
45: {
46: NNPFSDEB(XDEBDEV, ("xfsopen dev = %d.%d, flag = %d, devtype = %d\n",
47: major(dev), minor(dev), flag, devtype));
48: return xfs_devopen_common(dev);
49: }
50:
51: int
52: xfs_devclose(dev_t dev, int flag, int devtype, d_thread_t *p)
53: {
54: NNPFSDEB(XDEBDEV, ("xfs_devclose dev = %d(%d), flag = 0x%x\n",
55: major(dev), minor(dev), flag));
56:
57: return xfs_devclose_common(dev, p);
58: }
59:
60: int
61: xfs_devioctl(dev_t dev, u_long cmd, caddr_t data, int flags, d_thread_t *p)
62: {
63: NNPFSDEB(XDEBDEV, ("xfs_devioctl dev = %d.%d, cmd = %lu, "
64: "data = %lx, flags = %x\n", major(dev), minor(dev),
65: (unsigned long)cmd, (unsigned long)data, flags));
66: return ENOTTY;
67: }
68:
69: int
70: xfs_devpoll(dev_t dev, int events, d_thread_t * p)
71: {
72: struct xfs_channel *chan = &xfs_channel[minor(dev)];
73:
74: NNPFSDEB(XDEBDEV, ("xfs_devpoll dev = %d(%d), events = 0x%x\n",
75: major(dev), minor(dev), events));
76:
77: if ((events & (POLLIN | POLLRDNORM)) == 0)
78: return 0; /* only supports read */
79:
80: if (!xfs_emptyq(&chan->messageq))
81: return (events & (POLLIN | POLLRDNORM));
82:
83: selrecord (p, &chan->selinfo);
84:
85: return 0;
86: }
87:
88: void
89: xfs_select_wakeup(struct xfs_channel *chan)
90: {
91: selwakeup (&chan->selinfo);
92: }
93:
94: /*
95: * Install and uninstall device.
96: */
97:
98: struct cdevsw xfs_dev = {
99: xfs_devopen,
100: xfs_devclose,
101: xfs_devread,
102: xfs_devwrite,
103: xfs_devioctl,
104: (dev_type_stop((*))) enodev,
105: 0,
106: xfs_devpoll,
107: (dev_type_mmap((*))) enodev,
108: 0
109: };
110:
111: int
112: xfs_install_device(void)
113: {
114: int i;
115:
116: for (i = 0; i < NNNPFS; i++) {
117: NNPFSDEB(XDEBDEV, ("before initq(messageq and sleepq)\n"));
118: xfs_initq(&xfs_channel[i].messageq);
119: xfs_initq(&xfs_channel[i].sleepq);
120: xfs_channel[i].status = 0;
121: }
122: return 0;
123: }
124:
125: int
126: xfs_uninstall_device(void)
127: {
128: int i;
129: struct xfs_channel *chan;
130: int ret = 0;
131:
132: for (i = 0; i < NNNPFS; i++) {
133: chan = &xfs_channel[i];
134: if (chan->status & CHANNEL_OPENED)
135: xfs_devclose(makedev(0, i), 0, 0, NULL);
136: }
137:
138: NNPFSDEB(XDEBLKM, ("xfs_uninstall_device error %d\n", ret));
139: return ret;
140: }
141:
142: int
143: xfs_stat_device(void)
144: {
145: return xfs_uprintf_device();
146: }
147:
148: int
149: xfs_is_xfs_dev(dev_t dev)
150: {
151: return major(dev) <= nchrdev &&
152: cdevsw[major(dev)].d_open == xfs_devopen &&
153: minor(dev) >= 0 && minor(dev) < NNNPFS;
154: }
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