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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 1.5 2003/07/06 21:23:55 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>
55 #include <ufs/ufs/quota.h>
56 #include <ufs/ufs/inode.h>
57 #include <ufs/ufs/ufsmount.h>
58 #include <ufs/ufs/ufs_extern.h>
60 #include <ufs/ffs/fs.h>
61 #include <ufs/ffs/ffs_extern.h>
63 #include <ufs/mfs/mfsnode.h>
64 #include <ufs/mfs/mfs_extern.h>
66 MALLOC_DEFINE(M_MFSNODE, "MFS node", "MFS vnode private part");
69 static int mfs_minor; /* used for building internal dev_t */
71 extern vop_t **mfs_vnodeop_p;
73 static int mfs_mount __P((struct mount *mp,
74 char *path, caddr_t data, struct nameidata *ndp,
76 static int mfs_start __P((struct mount *mp, int flags, struct thread *td));
77 static int mfs_statfs __P((struct mount *mp, struct statfs *sbp,
79 static int mfs_init __P((struct vfsconf *));
81 static struct cdevsw mfs_cdevsw = {
85 /* write */ physwrite,
89 /* strategy */ nostrategy,
101 static struct vfsops mfs_vfsops = {
118 VFS_SET(mfs_vfsops, mfs, 0);
124 * Called when mounting local physical media
128 * mp mount point structure
129 * path NULL (flag for root mount!!!)
132 * p process (user credentials check [statfs])
135 * mp mount point structure
136 * path path to mount point
137 * data pointer to argument struct in user space
138 * ndp mount point namei() return (used for
139 * credentials on reload), reused to look
141 * p process (user credentials check)
144 * !0 error number (errno.h)
149 * mount point is locked
151 * mount point is locked
154 * A NULL path can be used for a flag since the mount
155 * system call will fail with EFAULT in copyinstr in
156 * namei() if it is a genuine NULL from the user.
160 mfs_mount(mp, path, data, ndp, td)
161 register struct mount *mp;
164 struct nameidata *ndp;
168 struct mfs_args args;
169 struct ufsmount *ump;
171 struct mfsnode *mfsp;
177 * Use NULL path to flag a root mount
182 * Mounting root file system
187 panic("mfs_mount: mount MFS as root: not configured!");
192 * Mounting non-root file system or updating a file system
196 /* copy in user arguments*/
197 if ((err = copyin(data, (caddr_t)&args, sizeof (struct mfs_args))) != 0)
201 * If updating, check whether changing from read-only to
202 * read/write; if there is no device name, that's all we do.
204 if (mp->mnt_flag & MNT_UPDATE) {
212 if (fs->fs_ronly == 0 && (mp->mnt_flag & MNT_RDONLY)) {
214 if (mp->mnt_flag & MNT_FORCE)
216 err = ffs_flushfiles(mp, flags, td);
220 if (fs->fs_ronly && (mp->mnt_kern_flag & MNTK_WANTRDWR))
222 /* if not updating name...*/
223 if (args.fspec == 0) {
225 * Process export requests. Jumping to "success"
226 * will return the vfs_export() error code.
228 err = vfs_export(mp, &ump->um_export, &args.export);
232 /* XXX MFS does not support name updating*/
236 * Do the MALLOC before the getnewvnode since doing so afterward
237 * might cause a bogus v_data pointer to get dereferenced
238 * elsewhere if MALLOC should block.
240 MALLOC(mfsp, struct mfsnode *, sizeof *mfsp, M_MFSNODE, M_WAITOK);
242 err = getnewvnode(VT_MFS, (struct mount *)0, mfs_vnodeop_p, &devvp);
244 FREE(mfsp, M_MFSNODE);
247 devvp->v_type = VBLK;
248 dev = make_dev(&mfs_cdevsw, mfs_minor, 0, 0, 0, "MFS%d", mfs_minor);
249 /* It is not clear that these will get initialized otherwise */
250 dev->si_bsize_phys = DEV_BSIZE;
251 dev->si_iosize_max = DFLTPHYS;
252 addaliasu(devvp, makeudev(253, mfs_minor++));
253 devvp->v_data = mfsp;
254 mfsp->mfs_baseoff = args.base;
255 mfsp->mfs_size = args.size;
256 mfsp->mfs_vnode = devvp;
258 mfsp->mfs_active = 1;
259 bufq_init(&mfsp->buf_queue);
262 * Since this is a new mount, we want the names for
263 * the device and the mount point copied in. If an
264 * error occurs, the mountpoint is discarded by the
267 /* Save "last mounted on" info for mount point (NULL pad)*/
268 copyinstr( path, /* mount point*/
269 mp->mnt_stat.f_mntonname, /* save area*/
270 MNAMELEN - 1, /* max size*/
271 &size); /* real size*/
272 bzero( mp->mnt_stat.f_mntonname + size, MNAMELEN - size);
274 /* Save "mounted from" info for mount point (NULL pad)*/
275 copyinstr( args.fspec, /* device name*/
276 mp->mnt_stat.f_mntfromname, /* save area*/
277 MNAMELEN - 1, /* max size*/
278 &size); /* real size*/
279 bzero( mp->mnt_stat.f_mntfromname + size, MNAMELEN - size);
281 if ((err = ffs_mountfs(devvp, mp, td, M_MFSNODE)) != 0) {
282 mfsp->mfs_active = 0;
287 * Initialize FS stat information in mount struct; uses both
288 * mp->mnt_stat.f_mntonname and mp->mnt_stat.f_mntfromname
290 * This code is common to root and non-root mounts
292 (void) VFS_STATFS(mp, &mp->mnt_stat, td);
296 error_2: /* error with devvp held*/
298 /* release devvp before failing*/
301 error_1: /* no state to back out*/
308 static int mfs_pri = PWAIT | PCATCH; /* XXX prob. temp */
311 * Used to grab the process and keep it in the kernel to service
312 * memory filesystem I/O requests.
314 * Loop servicing I/O requests.
315 * Copy the requested data into or out of the memory filesystem
320 mfs_start(struct mount *mp, int flags, struct thread *td)
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.
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, td) != 0) {
366 KKASSERT(td->td_proc);
367 sig = CURSIG(td->td_proc);
369 SIGDELSET(td->td_proc->p_siglist, sig);
372 else if (tsleep((caddr_t)vp, mfs_pri, "mfsidl", 0))
373 gotsig++; /* try to unmount in next pass */
379 * Get file system statistics.
382 mfs_statfs(struct mount *mp, struct statfs *sbp, struct thread *td)
386 error = ffs_statfs(mp, sbp, td);
387 sbp->f_type = mp->mnt_vfc->vfc_typenum;
392 * Memory based filesystem initialization.
396 struct vfsconf *vfsp;
399 cdevsw_add(&mfs_cdevsw);