2 * Copyright (c) 1989, 1990, 1993, 1994
3 * The Regents of the University of California. All rights reserved.
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
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.
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
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 $
40 #include <sys/param.h>
41 #include <sys/systm.h>
43 #include <sys/kernel.h>
46 #include <sys/mount.h>
47 #include <sys/signalvar.h>
48 #include <sys/vnode.h>
49 #include <sys/malloc.h>
50 #include <sys/linker.h>
52 #include <ufs/ufs/quota.h>
53 #include <ufs/ufs/inode.h>
54 #include <ufs/ufs/ufsmount.h>
55 #include <ufs/ufs/ufs_extern.h>
57 #include <ufs/ffs/fs.h>
58 #include <ufs/ffs/ffs_extern.h>
60 #include <ufs/mfs/mfsnode.h>
61 #include <ufs/mfs/mfs_extern.h>
63 MALLOC_DEFINE(M_MFSNODE, "MFS node", "MFS vnode private part");
66 static int mfs_minor; /* used for building internal dev_t */
68 extern vop_t **mfs_vnodeop_p;
70 static int mfs_mount __P((struct mount *mp,
71 char *path, caddr_t data, struct nameidata *ndp,
73 static int mfs_start __P((struct mount *mp, int flags, struct proc *p));
74 static int mfs_statfs __P((struct mount *mp, struct statfs *sbp,
76 static int mfs_init __P((struct vfsconf *));
78 static struct cdevsw mfs_cdevsw = {
82 /* write */ physwrite,
86 /* strategy */ nostrategy,
98 static struct vfsops mfs_vfsops = {
115 VFS_SET(mfs_vfsops, mfs, 0);
121 * Called when mounting local physical media
125 * mp mount point structure
126 * path NULL (flag for root mount!!!)
129 * p process (user credentials check [statfs])
132 * mp mount point structure
133 * path path to mount point
134 * data pointer to argument struct in user space
135 * ndp mount point namei() return (used for
136 * credentials on reload), reused to look
138 * p process (user credentials check)
141 * !0 error number (errno.h)
146 * mount point is locked
148 * mount point is locked
151 * A NULL path can be used for a flag since the mount
152 * system call will fail with EFAULT in copyinstr in
153 * namei() if it is a genuine NULL from the user.
157 mfs_mount(mp, path, data, ndp, p)
158 register struct mount *mp;
161 struct nameidata *ndp;
165 struct mfs_args args;
166 struct ufsmount *ump;
168 struct mfsnode *mfsp;
174 * Use NULL path to flag a root mount
179 * Mounting root file system
184 panic("mfs_mount: mount MFS as root: not configured!");
189 * Mounting non-root file system or updating a file system
193 /* copy in user arguments*/
194 if ((err = copyin(data, (caddr_t)&args, sizeof (struct mfs_args))) != 0)
198 * If updating, check whether changing from read-only to
199 * read/write; if there is no device name, that's all we do.
201 if (mp->mnt_flag & MNT_UPDATE) {
209 if (fs->fs_ronly == 0 && (mp->mnt_flag & MNT_RDONLY)) {
211 if (mp->mnt_flag & MNT_FORCE)
213 err = ffs_flushfiles(mp, flags, p);
217 if (fs->fs_ronly && (mp->mnt_kern_flag & MNTK_WANTRDWR))
219 /* if not updating name...*/
220 if (args.fspec == 0) {
222 * Process export requests. Jumping to "success"
223 * will return the vfs_export() error code.
225 err = vfs_export(mp, &ump->um_export, &args.export);
229 /* XXX MFS does not support name updating*/
233 * Do the MALLOC before the getnewvnode since doing so afterward
234 * might cause a bogus v_data pointer to get dereferenced
235 * elsewhere if MALLOC should block.
237 MALLOC(mfsp, struct mfsnode *, sizeof *mfsp, M_MFSNODE, M_WAITOK);
239 err = getnewvnode(VT_MFS, (struct mount *)0, mfs_vnodeop_p, &devvp);
241 FREE(mfsp, M_MFSNODE);
244 devvp->v_type = VBLK;
245 dev = make_dev(&mfs_cdevsw, mfs_minor, 0, 0, 0, "MFS%d", mfs_minor);
246 /* It is not clear that these will get initialized otherwise */
247 dev->si_bsize_phys = DEV_BSIZE;
248 dev->si_iosize_max = DFLTPHYS;
249 addaliasu(devvp, makeudev(253, mfs_minor++));
250 devvp->v_data = mfsp;
251 mfsp->mfs_baseoff = args.base;
252 mfsp->mfs_size = args.size;
253 mfsp->mfs_vnode = devvp;
254 mfsp->mfs_pid = p->p_pid;
255 mfsp->mfs_active = 1;
256 bufq_init(&mfsp->buf_queue);
259 * Since this is a new mount, we want the names for
260 * the device and the mount point copied in. If an
261 * error occurs, the mountpoint is discarded by the
264 /* Save "last mounted on" info for mount point (NULL pad)*/
265 copyinstr( path, /* mount point*/
266 mp->mnt_stat.f_mntonname, /* save area*/
267 MNAMELEN - 1, /* max size*/
268 &size); /* real size*/
269 bzero( mp->mnt_stat.f_mntonname + size, MNAMELEN - size);
271 /* Save "mounted from" info for mount point (NULL pad)*/
272 copyinstr( args.fspec, /* device name*/
273 mp->mnt_stat.f_mntfromname, /* save area*/
274 MNAMELEN - 1, /* max size*/
275 &size); /* real size*/
276 bzero( mp->mnt_stat.f_mntfromname + size, MNAMELEN - size);
278 if ((err = ffs_mountfs(devvp, mp, p, M_MFSNODE)) != 0) {
279 mfsp->mfs_active = 0;
284 * Initialize FS stat information in mount struct; uses both
285 * mp->mnt_stat.f_mntonname and mp->mnt_stat.f_mntfromname
287 * This code is common to root and non-root mounts
289 (void) VFS_STATFS(mp, &mp->mnt_stat, p);
293 error_2: /* error with devvp held*/
295 /* release devvp before failing*/
298 error_1: /* no state to back out*/
305 static int mfs_pri = PWAIT | PCATCH; /* XXX prob. temp */
308 * Used to grab the process and keep it in the kernel to service
309 * memory filesystem I/O requests.
311 * Loop servicing I/O requests.
312 * Copy the requested data into or out of the memory filesystem
317 mfs_start(mp, flags, p)
322 register struct vnode *vp = VFSTOUFS(mp)->um_devvp;
323 register struct mfsnode *mfsp = VTOMFS(vp);
324 register struct buf *bp;
325 register int gotsig = 0, sig;
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.
336 while (mfsp->mfs_active) {
341 while ((bp = bufq_first(&mfsp->buf_queue)) != NULL) {
342 bufq_remove(&mfsp->buf_queue, bp);
352 * If a non-ignored signal is received, try to unmount.
353 * If that fails, clear the signal (it has been "processed"),
354 * otherwise we will loop here, as tsleep will always return
358 * Note that dounmount() may fail if work was queued after
359 * we slept. We have to jump hoops here to make sure that we
360 * process any buffers after the sleep, before we dounmount()
364 if (dounmount(mp, 0, p) != 0) {
367 SIGDELSET(p->p_siglist, sig);
370 else if (tsleep((caddr_t)vp, mfs_pri, "mfsidl", 0))
371 gotsig++; /* try to unmount in next pass */
377 * Get file system statistics.
380 mfs_statfs(mp, sbp, p)
387 error = ffs_statfs(mp, sbp, p);
388 sbp->f_type = mp->mnt_vfc->vfc_typenum;
393 * Memory based filesystem initialization.
397 struct vfsconf *vfsp;
400 cdevsw_add(&mfs_cdevsw);