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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 $
35 * $DragonFly: src/sys/vfs/mfs/mfs_vfsops.c,v 1.2 2003/06/17 04:28:59 dillon Exp $
41 #include <sys/param.h>
42 #include <sys/systm.h>
44 #include <sys/kernel.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>
53 #include <ufs/ufs/quota.h>
54 #include <ufs/ufs/inode.h>
55 #include <ufs/ufs/ufsmount.h>
56 #include <ufs/ufs/ufs_extern.h>
58 #include <ufs/ffs/fs.h>
59 #include <ufs/ffs/ffs_extern.h>
61 #include <ufs/mfs/mfsnode.h>
62 #include <ufs/mfs/mfs_extern.h>
64 MALLOC_DEFINE(M_MFSNODE, "MFS node", "MFS vnode private part");
67 static int mfs_minor; /* used for building internal dev_t */
69 extern vop_t **mfs_vnodeop_p;
71 static int mfs_mount __P((struct mount *mp,
72 char *path, caddr_t data, struct nameidata *ndp,
74 static int mfs_start __P((struct mount *mp, int flags, struct proc *p));
75 static int mfs_statfs __P((struct mount *mp, struct statfs *sbp,
77 static int mfs_init __P((struct vfsconf *));
79 static struct cdevsw mfs_cdevsw = {
83 /* write */ physwrite,
87 /* strategy */ nostrategy,
99 static struct vfsops mfs_vfsops = {
116 VFS_SET(mfs_vfsops, mfs, 0);
122 * Called when mounting local physical media
126 * mp mount point structure
127 * path NULL (flag for root mount!!!)
130 * p process (user credentials check [statfs])
133 * mp mount point structure
134 * path path to mount point
135 * data pointer to argument struct in user space
136 * ndp mount point namei() return (used for
137 * credentials on reload), reused to look
139 * p process (user credentials check)
142 * !0 error number (errno.h)
147 * mount point is locked
149 * mount point is locked
152 * A NULL path can be used for a flag since the mount
153 * system call will fail with EFAULT in copyinstr in
154 * namei() if it is a genuine NULL from the user.
158 mfs_mount(mp, path, data, ndp, p)
159 register struct mount *mp;
162 struct nameidata *ndp;
166 struct mfs_args args;
167 struct ufsmount *ump;
169 struct mfsnode *mfsp;
175 * Use NULL path to flag a root mount
180 * Mounting root file system
185 panic("mfs_mount: mount MFS as root: not configured!");
190 * Mounting non-root file system or updating a file system
194 /* copy in user arguments*/
195 if ((err = copyin(data, (caddr_t)&args, sizeof (struct mfs_args))) != 0)
199 * If updating, check whether changing from read-only to
200 * read/write; if there is no device name, that's all we do.
202 if (mp->mnt_flag & MNT_UPDATE) {
210 if (fs->fs_ronly == 0 && (mp->mnt_flag & MNT_RDONLY)) {
212 if (mp->mnt_flag & MNT_FORCE)
214 err = ffs_flushfiles(mp, flags, p);
218 if (fs->fs_ronly && (mp->mnt_kern_flag & MNTK_WANTRDWR))
220 /* if not updating name...*/
221 if (args.fspec == 0) {
223 * Process export requests. Jumping to "success"
224 * will return the vfs_export() error code.
226 err = vfs_export(mp, &ump->um_export, &args.export);
230 /* XXX MFS does not support name updating*/
234 * Do the MALLOC before the getnewvnode since doing so afterward
235 * might cause a bogus v_data pointer to get dereferenced
236 * elsewhere if MALLOC should block.
238 MALLOC(mfsp, struct mfsnode *, sizeof *mfsp, M_MFSNODE, M_WAITOK);
240 err = getnewvnode(VT_MFS, (struct mount *)0, mfs_vnodeop_p, &devvp);
242 FREE(mfsp, M_MFSNODE);
245 devvp->v_type = VBLK;
246 dev = make_dev(&mfs_cdevsw, mfs_minor, 0, 0, 0, "MFS%d", mfs_minor);
247 /* It is not clear that these will get initialized otherwise */
248 dev->si_bsize_phys = DEV_BSIZE;
249 dev->si_iosize_max = DFLTPHYS;
250 addaliasu(devvp, makeudev(253, mfs_minor++));
251 devvp->v_data = mfsp;
252 mfsp->mfs_baseoff = args.base;
253 mfsp->mfs_size = args.size;
254 mfsp->mfs_vnode = devvp;
255 mfsp->mfs_pid = p->p_pid;
256 mfsp->mfs_active = 1;
257 bufq_init(&mfsp->buf_queue);
260 * Since this is a new mount, we want the names for
261 * the device and the mount point copied in. If an
262 * error occurs, the mountpoint is discarded by the
265 /* Save "last mounted on" info for mount point (NULL pad)*/
266 copyinstr( path, /* mount point*/
267 mp->mnt_stat.f_mntonname, /* save area*/
268 MNAMELEN - 1, /* max size*/
269 &size); /* real size*/
270 bzero( mp->mnt_stat.f_mntonname + size, MNAMELEN - size);
272 /* Save "mounted from" info for mount point (NULL pad)*/
273 copyinstr( args.fspec, /* device name*/
274 mp->mnt_stat.f_mntfromname, /* save area*/
275 MNAMELEN - 1, /* max size*/
276 &size); /* real size*/
277 bzero( mp->mnt_stat.f_mntfromname + size, MNAMELEN - size);
279 if ((err = ffs_mountfs(devvp, mp, p, M_MFSNODE)) != 0) {
280 mfsp->mfs_active = 0;
285 * Initialize FS stat information in mount struct; uses both
286 * mp->mnt_stat.f_mntonname and mp->mnt_stat.f_mntfromname
288 * This code is common to root and non-root mounts
290 (void) VFS_STATFS(mp, &mp->mnt_stat, p);
294 error_2: /* error with devvp held*/
296 /* release devvp before failing*/
299 error_1: /* no state to back out*/
306 static int mfs_pri = PWAIT | PCATCH; /* XXX prob. temp */
309 * Used to grab the process and keep it in the kernel to service
310 * memory filesystem I/O requests.
312 * Loop servicing I/O requests.
313 * Copy the requested data into or out of the memory filesystem
318 mfs_start(mp, flags, p)
323 register struct vnode *vp = VFSTOUFS(mp)->um_devvp;
324 register struct mfsnode *mfsp = VTOMFS(vp);
325 register struct buf *bp;
326 register int gotsig = 0, sig;
329 * We must prevent the system from trying to swap
330 * out or kill ( when swap space is low, see vm/pageout.c ) the
331 * process. A deadlock can occur if the process is swapped out,
332 * and the system can loop trying to kill the unkillable ( while
333 * references exist ) MFS process when swap space is low.
337 while (mfsp->mfs_active) {
342 while ((bp = bufq_first(&mfsp->buf_queue)) != NULL) {
343 bufq_remove(&mfsp->buf_queue, bp);
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
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()
365 if (dounmount(mp, 0, p) != 0) {
368 SIGDELSET(p->p_siglist, sig);
371 else if (tsleep((caddr_t)vp, mfs_pri, "mfsidl", 0))
372 gotsig++; /* try to unmount in next pass */
378 * Get file system statistics.
381 mfs_statfs(mp, sbp, p)
388 error = ffs_statfs(mp, sbp, p);
389 sbp->f_type = mp->mnt_vfc->vfc_typenum;
394 * Memory based filesystem initialization.
398 struct vfsconf *vfsp;
401 cdevsw_add(&mfs_cdevsw);