proc->thread stage 4: rework the VFS and DEVICE subsystems to take thread
[dragonfly.git] / sys / vfs / fdesc / fdesc_vfsops.c
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1/*
2 * Copyright (c) 1992, 1993, 1995
3 * The Regents of the University of California. All rights reserved.
4 *
5 * This code is derived from software donated to Berkeley by
6 * Jan-Simon Pendry.
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 * 1. Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in the
15 * documentation and/or other materials provided with the distribution.
16 * 3. All advertising materials mentioning features or use of this software
17 * must display the following acknowledgement:
18 * This product includes software developed by the University of
19 * California, Berkeley and its contributors.
20 * 4. Neither the name of the University nor the names of its contributors
21 * may be used to endorse or promote products derived from this software
22 * without specific prior written permission.
23 *
24 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
25 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
26 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
27 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
28 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
29 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
30 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
31 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
32 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
33 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
34 * SUCH DAMAGE.
35 *
36 * @(#)fdesc_vfsops.c 8.4 (Berkeley) 1/21/94
37 *
38 * $FreeBSD: src/sys/miscfs/fdesc/fdesc_vfsops.c,v 1.22.2.3 2002/08/23 17:42:39 njl Exp $
dadab5e9 39 * $DragonFly: src/sys/vfs/fdesc/fdesc_vfsops.c,v 1.3 2003/06/25 03:55:58 dillon Exp $
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40 */
41
42/*
43 * /dev/fd Filesystem
44 */
45
46#include <sys/param.h>
47#include <sys/systm.h>
48#include <sys/filedesc.h>
49#include <sys/kernel.h>
50#include <sys/lock.h>
51#include <sys/malloc.h>
52#include <sys/mount.h>
53#include <sys/proc.h>
54#include <sys/resourcevar.h>
55#include <sys/socket.h>
56#include <sys/vnode.h>
57
58#include <miscfs/fdesc/fdesc.h>
59
60static MALLOC_DEFINE(M_FDESCMNT, "FDESC mount", "FDESC mount structure");
61
62static int fdesc_mount __P((struct mount *mp, char *path, caddr_t data,
dadab5e9 63 struct nameidata *ndp, struct thread *td));
984263bc 64static int fdesc_unmount __P((struct mount *mp, int mntflags,
dadab5e9 65 struct thread *td));
984263bc 66static int fdesc_statfs __P((struct mount *mp, struct statfs *sbp,
dadab5e9 67 struct thread *td));
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68
69/*
70 * Mount the per-process file descriptors (/dev/fd)
71 */
72static int
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73fdesc_mount(struct mount *mp, char *path, caddr_t data,
74 struct nameidata *ndp, struct thread *td)
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75{
76 int error = 0;
77 struct fdescmount *fmp;
78 struct vnode *rvp;
79 size_t size;
80
81 if (path == NULL)
82 panic("fdesc_mount: cannot mount as root");
83
84 /*
85 * Update is a no-op
86 */
87 if (mp->mnt_flag & MNT_UPDATE)
88 return (EOPNOTSUPP);
89
dadab5e9 90 error = fdesc_allocvp(Froot, FD_ROOT, mp, &rvp, td);
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91 if (error)
92 return (error);
93
94 MALLOC(fmp, struct fdescmount *, sizeof(struct fdescmount),
95 M_FDESCMNT, M_WAITOK); /* XXX */
96 rvp->v_type = VDIR;
97 rvp->v_flag |= VROOT;
98 fmp->f_root = rvp;
99 /* XXX -- don't mark as local to work around fts() problems */
100 /*mp->mnt_flag |= MNT_LOCAL;*/
101 mp->mnt_data = (qaddr_t) fmp;
102 vfs_getnewfsid(mp);
103
104 (void) copyinstr(path, mp->mnt_stat.f_mntonname, MNAMELEN - 1, &size);
105 bzero(mp->mnt_stat.f_mntonname + size, MNAMELEN - size);
106 bzero(mp->mnt_stat.f_mntfromname, MNAMELEN);
107 bcopy("fdesc", mp->mnt_stat.f_mntfromname, sizeof("fdesc"));
dadab5e9 108 (void)fdesc_statfs(mp, &mp->mnt_stat, td);
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109 return (0);
110}
111
112static int
dadab5e9 113fdesc_unmount(struct mount *mp, int mntflags, struct thread *td)
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114{
115 int error;
116 int flags = 0;
117
118 if (mntflags & MNT_FORCE)
119 flags |= FORCECLOSE;
120
121 /*
122 * Clear out buffer cache. I don't think we
123 * ever get anything cached at this level at the
124 * moment, but who knows...
125 *
126 * There is 1 extra root vnode reference corresponding
127 * to f_root.
128 */
129 if ((error = vflush(mp, 1, flags)) != 0)
130 return (error);
131
132 /*
133 * Finally, throw away the fdescmount structure
134 */
135 free(mp->mnt_data, M_FDESCMNT); /* XXX */
136 mp->mnt_data = 0;
137
138 return (0);
139}
140
141int
dadab5e9 142fdesc_root(struct mount *mp, struct vnode **vpp)
984263bc 143{
dadab5e9 144 struct thread *td = curthread; /* XXX */
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145 struct vnode *vp;
146
147 /*
148 * Return locked reference to root.
149 */
150 vp = VFSTOFDESC(mp)->f_root;
151 VREF(vp);
dadab5e9 152 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY, td);
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153 *vpp = vp;
154 return (0);
155}
156
157static int
dadab5e9 158fdesc_statfs(struct mount *mp, struct statfs *sbp, struct thread *td)
984263bc 159{
dadab5e9 160 struct proc *p = td->td_proc;
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161 struct filedesc *fdp;
162 int lim;
163 int i;
164 int last;
165 int freefd;
166
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167 KKASSERT(p);
168
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169 /*
170 * Compute number of free file descriptors.
171 * [ Strange results will ensue if the open file
172 * limit is ever reduced below the current number
173 * of open files... ]
174 */
175 lim = p->p_rlimit[RLIMIT_NOFILE].rlim_cur;
176 fdp = p->p_fd;
177 last = min(fdp->fd_nfiles, lim);
178 freefd = 0;
179 for (i = fdp->fd_freefile; i < last; i++)
180 if (fdp->fd_ofiles[i] == NULL)
181 freefd++;
182
183 /*
184 * Adjust for the fact that the fdesc array may not
185 * have been fully allocated yet.
186 */
187 if (fdp->fd_nfiles < lim)
188 freefd += (lim - fdp->fd_nfiles);
189
190 sbp->f_flags = 0;
191 sbp->f_bsize = DEV_BSIZE;
192 sbp->f_iosize = DEV_BSIZE;
193 sbp->f_blocks = 2; /* 1K to keep df happy */
194 sbp->f_bfree = 0;
195 sbp->f_bavail = 0;
196 sbp->f_files = lim + 1; /* Allow for "." */
197 sbp->f_ffree = freefd; /* See comments above */
198 if (sbp != &mp->mnt_stat) {
199 sbp->f_type = mp->mnt_vfc->vfc_typenum;
200 bcopy(&mp->mnt_stat.f_fsid, &sbp->f_fsid, sizeof(sbp->f_fsid));
201 bcopy(mp->mnt_stat.f_mntonname, sbp->f_mntonname, MNAMELEN);
202 bcopy(mp->mnt_stat.f_mntfromname, sbp->f_mntfromname, MNAMELEN);
203 }
204 return (0);
205}
206
207static struct vfsops fdesc_vfsops = {
208 fdesc_mount,
209 vfs_stdstart,
210 fdesc_unmount,
211 fdesc_root,
212 vfs_stdquotactl,
213 fdesc_statfs,
214 vfs_stdsync,
215 vfs_stdvget,
216 vfs_stdfhtovp,
217 vfs_stdcheckexp,
218 vfs_stdvptofh,
219 fdesc_init,
220 vfs_stduninit,
221 vfs_stdextattrctl,
222};
223
224VFS_SET(fdesc_vfsops, fdesc, VFCF_SYNTHETIC);