/* * Copyright (c) 1989, 1990, 1993, 1994 * The Regents of the University of California. All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * 3. All advertising materials mentioning features or use of this software * must display the following acknowledgement: * This product includes software developed by the University of * California, Berkeley and its contributors. * 4. Neither the name of the University nor the names of its contributors * may be used to endorse or promote products derived from this software * without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. * * @(#)mfs_vfsops.c 8.4 (Berkeley) 4/16/94 * $FreeBSD$ */ #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #ifdef MFS_AUTOLOAD # include /* S_IFCHR */ # include /* console IO */ #endif static int mfs_imageload __P((dev_t dev, caddr_t addr, int size)); extern int mfs_initminiroot __P((caddr_t base)); static caddr_t mfs_rootbase; /* address of mini-root in kernel virtual memory */ static u_long mfs_rootsize; /* size of mini-root in bytes */ static int mfs_minor; /* used for building internal dev_t */ extern vop_t **mfs_vnodeop_p; static int mfs_mount __P((struct mount *mp, char *path, caddr_t data, struct nameidata *ndp, struct proc *p)); static int mfs_start __P((struct mount *mp, int flags, struct proc *p)); static int mfs_statfs __P((struct mount *mp, struct statfs *sbp, struct proc *p)); static int mfs_init __P((void)); /* * mfs vfs operations. */ struct vfsops mfs_vfsops = { mfs_mount, mfs_start, ffs_unmount, ufs_root, ufs_quotactl, mfs_statfs, ffs_sync, ffs_vget, ffs_fhtovp, ffs_vptofh, mfs_init, }; VFS_SET(mfs_vfsops, mfs, MOUNT_MFS, 0); #ifdef MFS_ROOT static u_char mfs_root[MFS_ROOT*1024] = "MFS Filesystem goes here"; static u_char end_mfs_root[] = "MFS Filesystem had better STOP here"; #ifdef MFS_AUTOLOAD /* * XXX: UGLY UGLY UGLY!!!!! * XXX: This whole MFS_ROOT thing would be loads cleaner if we used * XXX: a "proper" ramdisk with a FFS image. * * This is a crude hack to load a floppy image into the MFS image (above) * in case the boot kernel did not have the root image installed due to * kzip size problems in 4MB. -Peter */ #define IMAGE_BLOCKING (32 * 1024) static int mfs_imageload (dev, addr, size) dev_t dev; caddr_t addr; int size; { int error, offset, chunk; int maj = major(dev); int mindev = minor(dev); struct iovec iovec; struct uio uio; error = (*cdevsw[maj]->d_open)(dev, 0, S_IFCHR , (struct proc *)0); if (error) { printf("mfs_imageload: could not open load device c %d,%d\n", maj, mindev); goto out; } offset = 0; while (offset < size) { /* pick a size to transfer, preferably a whole cylinder */ chunk = min(size - offset, IMAGE_BLOCKING); /* do I/O to kernel space. Is there a better way ? */ iovec.iov_base = addr + offset; iovec.iov_len = chunk; uio.uio_iov = &iovec; uio.uio_iovcnt = 1; uio.uio_offset = offset; uio.uio_resid = chunk; uio.uio_segflg = UIO_SYSSPACE; uio.uio_rw = UIO_READ; uio.uio_procp = (struct proc *)0; /* perform the read request */ error = (*cdevsw[maj]->d_read)(dev, &uio, 0); if (error) { printf("mfs_imageload: read failed! (error %d)\n", error); break; } /* sanity check - check there's no leftover... */ if (uio.uio_resid != 0) { printf("mfs_imageload: load failing...\n"); break; } offset += chunk; } /* close the driver */ out: (void)(*cdevsw[maj]->d_close)(dev, 0, S_IFCHR, (struct proc *)0); return (error); } #endif /* MFS_AUTOLOAD */ #endif /* MFS_ROOT */ /* * mfs_mount * * Called when mounting local physical media * * PARAMETERS: * mountroot * mp mount point structure * path NULL (flag for root mount!!!) * data * ndp * p process (user credentials check [statfs]) * * mount * mp mount point structure * path path to mount point * data pointer to argument struct in user space * ndp mount point namei() return (used for * credentials on reload), reused to look * up block device. * p process (user credentials check) * * RETURNS: 0 Success * !0 error number (errno.h) * * LOCK STATE: * * ENTRY * mount point is locked * EXIT * mount point is locked * * NOTES: * A NULL path can be used for a flag since the mount * system call will fail with EFAULT in copyinstr in * namei() if it is a genuine NULL from the user. */ /* ARGSUSED */ static int mfs_mount(mp, path, data, ndp, p) register struct mount *mp; char *path; caddr_t data; struct nameidata *ndp; struct proc *p; { struct vnode *devvp; struct mfs_args args; struct ufsmount *ump; register struct fs *fs; register struct mfsnode *mfsp; u_int size; int flags, err; /* * Use NULL path to flag a root mount */ if( path == NULL) { /* *** * Mounting root file system *** */ #ifdef MFS_ROOT /* Location of MFS/FFS superblock */ fs = (struct fs *)(mfs_root + SBOFF); #ifdef MFS_AUTOLOAD /* * check if image was installed during build * if not, attempt to load it now */ /* check for valid super block */ if (fs->fs_magic != FS_MAGIC || fs->fs_bsize > MAXBSIZE || fs->fs_bsize < sizeof(struct fs)) { dev_t dev = makedev(9, 0); /* boot floppy */ printf("MFS image not present in boot kernel!\n"); printf("Please replace boot disk with MFS disk...\n"); printf("Press any key when done.\n"); cngetc(); mfs_imageload(dev, mfs_root, end_mfs_root - mfs_root); } #endif /* MFS_AUTOLOAD */ /* recheck for valid super block */ if (fs->fs_magic != FS_MAGIC || fs->fs_bsize > MAXBSIZE || fs->fs_bsize < sizeof(struct fs)) { panic("MFS image is invalid!!"); } mfs_rootbase = mfs_root; mfs_rootsize = fs->fs_fsize * fs->fs_size; rootdev = makedev(255, mfs_minor++); printf("rootfs is %ld Kbyte compiled in MFS\n", mfs_rootsize/1024); /* Get vnode for root device*/ if( bdevvp( rootdev, &rootvp)) panic("mfs_mountroot: can't setup bdevvp for rootdev"); /* * FS specific handling */ MALLOC(mfsp, struct mfsnode *, sizeof *mfsp, M_MFSNODE, M_WAITOK); rootvp->v_data = mfsp; rootvp->v_op = mfs_vnodeop_p; rootvp->v_tag = VT_MFS; mfsp->mfs_baseoff = mfs_rootbase; mfsp->mfs_size = mfs_rootsize; mfsp->mfs_vnode = rootvp; mfsp->mfs_pid = p->p_pid; mfsp->mfs_active = 1; TAILQ_INIT(&mfsp->buf_queue); /* * Attempt mount */ if( (err = ffs_mountfs(rootvp, mp, p)) != 0 ) { /* fs specific cleanup (if any)*/ rootvp->v_data = NULL; FREE(mfsp, M_MFSNODE); goto error_1; } goto dostatfs; /* success*/ #else /* you loose */ panic("mfs_mount: mount MFS as root: not configured!"); #endif /* MFS_ROOT */ } /* *** * Mounting non-root file system or updating a file system *** */ /* copy in user arguments*/ if (err = copyin(data, (caddr_t)&args, sizeof (struct mfs_args))) goto error_1; /* * If updating, check whether changing from read-only to * read/write; if there is no device name, that's all we do. */ if (mp->mnt_flag & MNT_UPDATE) { /* ******************** * UPDATE ******************** */ ump = VFSTOUFS(mp); fs = ump->um_fs; if (fs->fs_ronly == 0 && (mp->mnt_flag & MNT_RDONLY)) { flags = WRITECLOSE; if (mp->mnt_flag & MNT_FORCE) flags |= FORCECLOSE; if (vfs_busy(mp)) { err = EBUSY; goto error_1; } err = ffs_flushfiles(mp, flags, p); vfs_unbusy(mp); if (err) goto error_1; } if (fs->fs_ronly && (mp->mnt_flag & MNT_WANTRDWR)) fs->fs_ronly = 0; #ifdef EXPORTMFS /* if not updating name...*/ if (args.fspec == 0) { /* * Process export requests. Jumping to "success" * will return the vfs_export() error code. */ err = vfs_export(mp, &ump->um_export, &args.export); goto success; } #endif /* XXX MFS does not support name updating*/ goto success; } /* * Do the MALLOC before the getnewvnode since doing so afterward * might cause a bogus v_data pointer to get dereferenced * elsewhere if MALLOC should block. */ MALLOC(mfsp, struct mfsnode *, sizeof *mfsp, M_MFSNODE, M_WAITOK); err = getnewvnode(VT_MFS, (struct mount *)0, mfs_vnodeop_p, &devvp); if (err) { FREE(mfsp, M_MFSNODE); goto error_1; } devvp->v_type = VBLK; if (checkalias(devvp, makedev(255, mfs_minor++), (struct mount *)0)) panic("mfs_mount: dup dev"); devvp->v_data = mfsp; mfsp->mfs_baseoff = args.base; mfsp->mfs_size = args.size; mfsp->mfs_vnode = devvp; mfsp->mfs_pid = p->p_pid; mfsp->mfs_active = 1; TAILQ_INIT(&mfsp->buf_queue); /* * Since this is a new mount, we want the names for * the device and the mount point copied in. If an * error occurs, the mountpoint is discarded by the * upper level code. */ /* Save "last mounted on" info for mount point (NULL pad)*/ copyinstr( path, /* mount point*/ mp->mnt_stat.f_mntonname, /* save area*/ MNAMELEN - 1, /* max size*/ &size); /* real size*/ bzero( mp->mnt_stat.f_mntonname + size, MNAMELEN - size); /* Save "mounted from" info for mount point (NULL pad)*/ copyinstr( args.fspec, /* device name*/ mp->mnt_stat.f_mntfromname, /* save area*/ MNAMELEN - 1, /* max size*/ &size); /* real size*/ bzero( mp->mnt_stat.f_mntfromname + size, MNAMELEN - size); if (err = ffs_mountfs(devvp, mp, p)) { mfsp->mfs_active = 0; goto error_2; } dostatfs: /* * Initialize FS stat information in mount struct; uses both * mp->mnt_stat.f_mntonname and mp->mnt_stat.f_mntfromname * * This code is common to root and non-root mounts */ (void) VFS_STATFS(mp, &mp->mnt_stat, p); goto success; error_2: /* error with devvp held*/ /* release devvp before failing*/ vrele(devvp); error_1: /* no state to back out*/ success: return( err); } static int mfs_pri = PWAIT | PCATCH; /* XXX prob. temp */ /* * Used to grab the process and keep it in the kernel to service * memory filesystem I/O requests. * * Loop servicing I/O requests. * Copy the requested data into or out of the memory filesystem * address space. */ /* ARGSUSED */ static int mfs_start(mp, flags, p) struct mount *mp; int flags; struct proc *p; { register struct vnode *vp = VFSTOUFS(mp)->um_devvp; register struct mfsnode *mfsp = VTOMFS(vp); register struct buf *bp; register caddr_t base; register int gotsig = 0; base = mfsp->mfs_baseoff; while (mfsp->mfs_active) { while (bp = TAILQ_FIRST(&mfsp->buf_queue)) { TAILQ_REMOVE(&mfsp->buf_queue, bp, b_act); mfs_doio(bp, base); wakeup((caddr_t)bp); } /* * If a non-ignored signal is received, try to unmount. * If that fails, clear the signal (it has been "processed"), * otherwise we will loop here, as tsleep will always return * EINTR/ERESTART. */ /* * Note that dounmount() may fail if work was queued after * we slept. We have to jump hoops here to make sure that we * process any buffers after the sleep, before we dounmount() */ if (gotsig) { gotsig = 0; if (dounmount(mp, 0, p) != 0) CLRSIG(p, CURSIG(p)); /* try sleep again.. */ } else if (tsleep((caddr_t)vp, mfs_pri, "mfsidl", 0)) gotsig++; /* try to unmount in next pass */ } return (0); } /* * Get file system statistics. */ static int mfs_statfs(mp, sbp, p) struct mount *mp; struct statfs *sbp; struct proc *p; { int error; error = ffs_statfs(mp, sbp, p); sbp->f_type = MOUNT_MFS; return (error); } /* * Memory based filesystem initialization. */ static int mfs_init() { return (0); }