__P()!=wanted, remove old style prototypes from the vfs subtree
[dragonfly.git] / sys / vfs / mfs / mfs_vfsops.c
CommitLineData
984263bc
MD
1/*
2 * Copyright (c) 1989, 1990, 1993, 1994
3 * The Regents of the University of California. All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 * 3. All advertising materials mentioning features or use of this software
14 * must display the following acknowledgement:
15 * This product includes software developed by the University of
16 * California, Berkeley and its contributors.
17 * 4. Neither the name of the University nor the names of its contributors
18 * may be used to endorse or promote products derived from this software
19 * without specific prior written permission.
20 *
21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31 * SUCH DAMAGE.
32 *
33 * @(#)mfs_vfsops.c 8.11 (Berkeley) 6/19/95
34 * $FreeBSD: src/sys/ufs/mfs/mfs_vfsops.c,v 1.81.2.3 2001/07/04 17:35:21 tegge Exp $
a6ee311a 35 * $DragonFly: src/sys/vfs/mfs/mfs_vfsops.c,v 1.11 2003/08/20 09:56:32 rob Exp $
984263bc
MD
36 */
37
38
39#include "opt_mfs.h"
40
41#include <sys/param.h>
42#include <sys/systm.h>
43#include <sys/conf.h>
44#include <sys/kernel.h>
45#include <sys/proc.h>
46#include <sys/buf.h>
47#include <sys/mount.h>
48#include <sys/signalvar.h>
49#include <sys/vnode.h>
50#include <sys/malloc.h>
51#include <sys/linker.h>
52
3020e3be
MD
53#include <sys/buf2.h>
54
1f2de5d4
MD
55#include <vfs/ufs/quota.h>
56#include <vfs/ufs/inode.h>
57#include <vfs/ufs/ufsmount.h>
58#include <vfs/ufs/ufs_extern.h>
59#include <vfs/ufs/fs.h>
60#include <vfs/ufs/ffs_extern.h>
984263bc 61
1f2de5d4
MD
62#include "mfsnode.h"
63#include "mfs_extern.h"
984263bc
MD
64
65MALLOC_DEFINE(M_MFSNODE, "MFS node", "MFS vnode private part");
66
67
68static int mfs_minor; /* used for building internal dev_t */
69
70extern vop_t **mfs_vnodeop_p;
71
a6ee311a 72static int mfs_mount (struct mount *mp,
984263bc 73 char *path, caddr_t data, struct nameidata *ndp,
a6ee311a
RG
74 struct thread *td);
75static int mfs_start (struct mount *mp, int flags, struct thread *td);
76static int mfs_statfs (struct mount *mp, struct statfs *sbp,
77 struct thread *td);
78static int mfs_init (struct vfsconf *);
984263bc 79
fabb8ceb
MD
80#define MFS_CDEV_MAJOR 253
81
984263bc 82static struct cdevsw mfs_cdevsw = {
fabb8ceb
MD
83 /* name */ "MFS",
84 /* maj */ MFS_CDEV_MAJOR,
85 /* flags */ D_DISK,
86 /* port */ NULL,
87 /* autoq */ 0,
88
984263bc
MD
89 /* open */ noopen,
90 /* close */ noclose,
91 /* read */ physread,
92 /* write */ physwrite,
93 /* ioctl */ noioctl,
94 /* poll */ nopoll,
95 /* mmap */ nommap,
96 /* strategy */ nostrategy,
984263bc 97 /* dump */ nodump,
fabb8ceb 98 /* psize */ nopsize
984263bc
MD
99};
100
101/*
102 * mfs vfs operations.
103 */
104static struct vfsops mfs_vfsops = {
105 mfs_mount,
106 mfs_start,
107 ffs_unmount,
108 ufs_root,
109 ufs_quotactl,
110 mfs_statfs,
111 ffs_sync,
112 ffs_vget,
113 ffs_fhtovp,
114 ufs_check_export,
115 ffs_vptofh,
116 mfs_init,
117 vfs_stduninit,
118 vfs_stdextattrctl,
119};
120
121VFS_SET(mfs_vfsops, mfs, 0);
122
123
124/*
125 * mfs_mount
126 *
127 * Called when mounting local physical media
128 *
129 * PARAMETERS:
130 * mountroot
131 * mp mount point structure
132 * path NULL (flag for root mount!!!)
133 * data <unused>
134 * ndp <unused>
135 * p process (user credentials check [statfs])
136 *
137 * mount
138 * mp mount point structure
139 * path path to mount point
140 * data pointer to argument struct in user space
141 * ndp mount point namei() return (used for
142 * credentials on reload), reused to look
143 * up block device.
144 * p process (user credentials check)
145 *
146 * RETURNS: 0 Success
147 * !0 error number (errno.h)
148 *
149 * LOCK STATE:
150 *
151 * ENTRY
152 * mount point is locked
153 * EXIT
154 * mount point is locked
155 *
156 * NOTES:
157 * A NULL path can be used for a flag since the mount
158 * system call will fail with EFAULT in copyinstr in
159 * namei() if it is a genuine NULL from the user.
160 */
161/* ARGSUSED */
162static int
dadab5e9 163mfs_mount(mp, path, data, ndp, td)
3ff2135f 164 struct mount *mp;
984263bc
MD
165 char *path;
166 caddr_t data;
167 struct nameidata *ndp;
dadab5e9 168 struct thread *td;
984263bc
MD
169{
170 struct vnode *devvp;
171 struct mfs_args args;
172 struct ufsmount *ump;
173 struct fs *fs;
174 struct mfsnode *mfsp;
175 size_t size;
176 int flags, err;
177 dev_t dev;
178
179 /*
180 * Use NULL path to flag a root mount
181 */
182 if( path == NULL) {
183 /*
184 ***
185 * Mounting root file system
186 ***
187 */
188
189 /* you lose */
190 panic("mfs_mount: mount MFS as root: not configured!");
191 }
192
193 /*
194 ***
195 * Mounting non-root file system or updating a file system
196 ***
197 */
198
199 /* copy in user arguments*/
200 if ((err = copyin(data, (caddr_t)&args, sizeof (struct mfs_args))) != 0)
201 goto error_1;
202
203 /*
204 * If updating, check whether changing from read-only to
205 * read/write; if there is no device name, that's all we do.
206 */
207 if (mp->mnt_flag & MNT_UPDATE) {
208 /*
209 ********************
210 * UPDATE
211 ********************
212 */
213 ump = VFSTOUFS(mp);
214 fs = ump->um_fs;
215 if (fs->fs_ronly == 0 && (mp->mnt_flag & MNT_RDONLY)) {
216 flags = WRITECLOSE;
217 if (mp->mnt_flag & MNT_FORCE)
218 flags |= FORCECLOSE;
dadab5e9 219 err = ffs_flushfiles(mp, flags, td);
984263bc
MD
220 if (err)
221 goto error_1;
222 }
223 if (fs->fs_ronly && (mp->mnt_kern_flag & MNTK_WANTRDWR))
224 fs->fs_ronly = 0;
225 /* if not updating name...*/
226 if (args.fspec == 0) {
227 /*
228 * Process export requests. Jumping to "success"
229 * will return the vfs_export() error code.
230 */
231 err = vfs_export(mp, &ump->um_export, &args.export);
232 goto success;
233 }
234
235 /* XXX MFS does not support name updating*/
236 goto success;
237 }
238 /*
239 * Do the MALLOC before the getnewvnode since doing so afterward
240 * might cause a bogus v_data pointer to get dereferenced
241 * elsewhere if MALLOC should block.
242 */
243 MALLOC(mfsp, struct mfsnode *, sizeof *mfsp, M_MFSNODE, M_WAITOK);
244
245 err = getnewvnode(VT_MFS, (struct mount *)0, mfs_vnodeop_p, &devvp);
246 if (err) {
247 FREE(mfsp, M_MFSNODE);
248 goto error_1;
249 }
0cbed593 250 devvp->v_type = VCHR;
984263bc
MD
251 dev = make_dev(&mfs_cdevsw, mfs_minor, 0, 0, 0, "MFS%d", mfs_minor);
252 /* It is not clear that these will get initialized otherwise */
253 dev->si_bsize_phys = DEV_BSIZE;
254 dev->si_iosize_max = DFLTPHYS;
255 addaliasu(devvp, makeudev(253, mfs_minor++));
256 devvp->v_data = mfsp;
257 mfsp->mfs_baseoff = args.base;
258 mfsp->mfs_size = args.size;
259 mfsp->mfs_vnode = devvp;
dadab5e9 260 mfsp->mfs_td = td;
984263bc
MD
261 mfsp->mfs_active = 1;
262 bufq_init(&mfsp->buf_queue);
263
264 /*
265 * Since this is a new mount, we want the names for
266 * the device and the mount point copied in. If an
267 * error occurs, the mountpoint is discarded by the
268 * upper level code.
269 */
270 /* Save "last mounted on" info for mount point (NULL pad)*/
271 copyinstr( path, /* mount point*/
272 mp->mnt_stat.f_mntonname, /* save area*/
273 MNAMELEN - 1, /* max size*/
274 &size); /* real size*/
275 bzero( mp->mnt_stat.f_mntonname + size, MNAMELEN - size);
276
277 /* Save "mounted from" info for mount point (NULL pad)*/
278 copyinstr( args.fspec, /* device name*/
279 mp->mnt_stat.f_mntfromname, /* save area*/
280 MNAMELEN - 1, /* max size*/
281 &size); /* real size*/
282 bzero( mp->mnt_stat.f_mntfromname + size, MNAMELEN - size);
283
dadab5e9 284 if ((err = ffs_mountfs(devvp, mp, td, M_MFSNODE)) != 0) {
984263bc
MD
285 mfsp->mfs_active = 0;
286 goto error_2;
287 }
288
289 /*
290 * Initialize FS stat information in mount struct; uses both
291 * mp->mnt_stat.f_mntonname and mp->mnt_stat.f_mntfromname
292 *
293 * This code is common to root and non-root mounts
294 */
dadab5e9 295 (void) VFS_STATFS(mp, &mp->mnt_stat, td);
984263bc
MD
296
297 goto success;
298
299error_2: /* error with devvp held*/
300
301 /* release devvp before failing*/
302 vrele(devvp);
303
304error_1: /* no state to back out*/
305
306success:
307 return( err);
308}
309
984263bc
MD
310/*
311 * Used to grab the process and keep it in the kernel to service
312 * memory filesystem I/O requests.
313 *
314 * Loop servicing I/O requests.
315 * Copy the requested data into or out of the memory filesystem
316 * address space.
317 */
318/* ARGSUSED */
319static int
dadab5e9 320mfs_start(struct mount *mp, int flags, struct thread *td)
984263bc 321{
3ff2135f
RG
322 struct vnode *vp = VFSTOUFS(mp)->um_devvp;
323 struct mfsnode *mfsp = VTOMFS(vp);
324 struct buf *bp;
325 int gotsig = 0, sig;
984263bc
MD
326
327 /*
328 * We must prevent the system from trying to swap
329 * out or kill ( when swap space is low, see vm/pageout.c ) the
330 * process. A deadlock can occur if the process is swapped out,
331 * and the system can loop trying to kill the unkillable ( while
332 * references exist ) MFS process when swap space is low.
333 */
8a8d5d85 334 KKASSERT(curproc);
984263bc
MD
335 PHOLD(curproc);
336
337 while (mfsp->mfs_active) {
338 int s;
339
340 s = splbio();
341
342 while ((bp = bufq_first(&mfsp->buf_queue)) != NULL) {
343 bufq_remove(&mfsp->buf_queue, bp);
344 splx(s);
345 mfs_doio(bp, mfsp);
346 wakeup((caddr_t)bp);
347 s = splbio();
348 }
349
350 splx(s);
351
352 /*
353 * If a non-ignored signal is received, try to unmount.
354 * If that fails, clear the signal (it has been "processed"),
355 * otherwise we will loop here, as tsleep will always return
356 * EINTR/ERESTART.
357 */
358 /*
359 * Note that dounmount() may fail if work was queued after
360 * we slept. We have to jump hoops here to make sure that we
361 * process any buffers after the sleep, before we dounmount()
362 */
363 if (gotsig) {
364 gotsig = 0;
dadab5e9
MD
365 if (dounmount(mp, 0, td) != 0) {
366 KKASSERT(td->td_proc);
367 sig = CURSIG(td->td_proc);
984263bc 368 if (sig)
dadab5e9 369 SIGDELSET(td->td_proc->p_siglist, sig);
984263bc
MD
370 }
371 }
377d4740 372 else if (tsleep((caddr_t)vp, PCATCH, "mfsidl", 0))
984263bc
MD
373 gotsig++; /* try to unmount in next pass */
374 }
375 return (0);
376}
377
378/*
379 * Get file system statistics.
380 */
381static int
dadab5e9 382mfs_statfs(struct mount *mp, struct statfs *sbp, struct thread *td)
984263bc
MD
383{
384 int error;
385
dadab5e9 386 error = ffs_statfs(mp, sbp, td);
984263bc
MD
387 sbp->f_type = mp->mnt_vfc->vfc_typenum;
388 return (error);
389}
390
391/*
392 * Memory based filesystem initialization.
393 */
394static int
395mfs_init(vfsp)
396 struct vfsconf *vfsp;
397{
398
399 cdevsw_add(&mfs_cdevsw);
400 return (0);
401}
402