bsd/ufs/mfs/mfs_vfsops.c

   1 /*
   2  * Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
   3  *
   4  * @APPLE_LICENSE_HEADER_START@
   5  *
   6  * The contents of this file constitute Original Code as defined in and
   7  * are subject to the Apple Public Source License Version 1.1 (the
   8  * "License").  You may not use this file except in compliance with the
   9  * License.  Please obtain a copy of the License at
  10  * http://www.apple.com/publicsource and read it before using this file.
  11  *
  12  * This Original Code and all software distributed under the License are
  13  * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  14  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  15  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  16  * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT.  Please see the
  17  * License for the specific language governing rights and limitations
  18  * under the License.
  19  *
  20  * @APPLE_LICENSE_HEADER_END@
  21  */
  22 /* Copyright (c) 1995 NeXT Computer, Inc. All Rights Reserved */
  23 /*
  24  * Copyright (c) 1989, 1990, 1993, 1994
  25  *      The Regents of the University of California.  All rights reserved.
  26  *
  27  * Redistribution and use in source and binary forms, with or without
  28  * modification, are permitted provided that the following conditions
  29  * are met:
  30  * 1. Redistributions of source code must retain the above copyright
  31  *    notice, this list of conditions and the following disclaimer.
  32  * 2. Redistributions in binary form must reproduce the above copyright
  33  *    notice, this list of conditions and the following disclaimer in the
  34  *    documentation and/or other materials provided with the distribution.
  35  * 3. All advertising materials mentioning features or use of this software
  36  *    must display the following acknowledgement:
  37  *      This product includes software developed by the University of
  38  *      California, Berkeley and its contributors.
  39  * 4. Neither the name of the University nor the names of its contributors
  40  *    may be used to endorse or promote products derived from this software
  41  *    without specific prior written permission.
  42  *
  43  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  44  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  45  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  46  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  47  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  48  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  49  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  50  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  51  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  52  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  53  * SUCH DAMAGE.
  54  *
  55  *      @(#)mfs_vfsops.c        8.4 (Berkeley) 4/16/94
  56  */
  57
  58 #include <sys/param.h>
  59 #include <sys/systm.h>
  60 #include <sys/time.h>
  61 #include <sys/kernel.h>
  62 #include <sys/proc.h>
  63 #include <sys/buf.h>
  64 #include <sys/mount.h>
  65 #include <sys/signalvar.h>
  66 #include <sys/vnode.h>
  67 #include <sys/malloc.h>
  68
  69 #include <ufs/ufs/quota.h>
  70 #include <ufs/ufs/inode.h>
  71 #include <ufs/ufs/ufsmount.h>
  72 #include <ufs/ufs/ufs_extern.h>
  73
  74 #include <ufs/ffs/fs.h>
  75 #include <ufs/ffs/ffs_extern.h>
  76
  77 #include <ufs/mfs/mfsnode.h>
  78 #include <ufs/mfs/mfs_extern.h>
  79
  80 caddr_t mfs_rootbase;   /* address of mini-root in kernel virtual memory */
  81 u_long  mfs_rootsize;   /* size of mini-root in bytes */
  82
  83 static  int mfs_minor;  /* used for building internal dev_t */
  84
  85 extern int (**mfs_vnodeop_p)(void *);
  86
  87 /*
  88  * mfs vfs operations.
  89  */
  90 struct vfsops mfs_vfsops = {
  91         MOUNT_MFS,
  92         mfs_mount,
  93         mfs_start,
  94         ffs_unmount,
  95         ufs_root,
  96         ufs_quotactl,
  97         mfs_statfs,
  98         ffs_sync,
  99         ffs_vget,
 100         ffs_fhtovp,
 101         ffs_vptofh,
 102         mfs_init,
 103 };
 104
 105 /*
 106  * Called by main() when mfs is going to be mounted as root.
 107  *
 108  * Name is updated by mount(8) after booting.
 109  */
 110 #define ROOTNAME        "mfs_root"
 111
 112 mfs_mountroot()
 113 {
 114         extern struct vnode *rootvp;
 115         register struct fs *fs;
 116         register struct mount *mp;
 117         struct proc *p = kernel_proc;   /* XXX - WMG*/
 118         struct ufsmount *ump;
 119         struct mfsnode *mfsp;
 120         size_t size;
 121         int error;
 122
 123         /*
 124          * Get vnodes for swapdev and rootdev.
 125          */
 126 #if 0
 127         if (bdevvp(swapdev, &swapdev_vp) || bdevvp(rootdev, &rootvp))
 128                 panic("mfs_mountroot: can't setup bdevvp's");
 129 #else
 130         if ( bdevvp(rootdev, &rootvp))
 131                 panic("mfs_mountroot: can't setup bdevvp's");
 132
 133 #endif
 134         MALLOC_ZONE(mp, struct mount *,
 135                         sizeof(struct mount), M_MOUNT, M_WAITOK);
 136         bzero((char *)mp, (u_long)sizeof(struct mount));
 137
 138     /* Initialize the default IO constraints */
 139     mp->mnt_maxreadcnt = mp->mnt_maxwritecnt = MAXPHYS;
 140     mp->mnt_segreadcnt = mp->mnt_segwritecnt = 32;
 141
 142         mp->mnt_op = &mfs_vfsops;
 143         mp->mnt_flag = MNT_RDONLY;
 144         MALLOC(mfsp, struct mfsnode *, sizeof(struct mfsnode), M_MFSNODE, M_WAITOK);
 145         rootvp->v_data = mfsp;
 146         rootvp->v_op = mfs_vnodeop_p;
 147         rootvp->v_tag = VT_MFS;
 148         mfsp->mfs_baseoff = mfs_rootbase;
 149         mfsp->mfs_size = mfs_rootsize;
 150         mfsp->mfs_vnode = rootvp;
 151         mfsp->mfs_pid = p->p_pid;
 152         mfsp->mfs_buflist = (struct buf *)0;
 153         if (error = ffs_mountfs(rootvp, mp, p)) {
 154                 _FREE_ZONE(mp, sizeof (struct mount), M_MOUNT);
 155                 _FREE(mfsp, M_MFSNODE);
 156                 return (error);
 157         }
 158         if (error = vfs_lock(mp)) {
 159                 (void)ffs_unmount(mp, 0, p);
 160                 _FREE_ZONE(mp, sizeof (struct mount), M_MOUNT);
 161                 _FREE(mfsp, M_MFSNODE);
 162                 return (error);
 163         }
 164         CIRCLEQ_INSERT_TAIL(&mountlist, mp, mnt_list);
 165         mp->mnt_vnodecovered = NULLVP;
 166         ump = VFSTOUFS(mp);
 167         fs = ump->um_fs;
 168         bzero(fs->fs_fsmnt, sizeof(fs->fs_fsmnt));
 169         fs->fs_fsmnt[0] = '/';
 170         bcopy(fs->fs_fsmnt, mp->mnt_stat.f_mntonname, MNAMELEN);
 171         (void) copystr(ROOTNAME, mp->mnt_stat.f_mntfromname, MNAMELEN - 1,
 172             &size);
 173         bzero(mp->mnt_stat.f_mntfromname + size, MNAMELEN - size);
 174         (void)ffs_statfs(mp, &mp->mnt_stat, p);
 175         vfs_unlock(mp);
 176         inittodr((time_t)0);
 177         return (0);
 178 }
 179
 180 /*
 181  * This is called early in boot to set the base address and size
 182  * of the mini-root.
 183  */
 184 mfs_initminiroot(base)
 185         caddr_t base;
 186 {
 187         struct fs *fs = (struct fs *)(base + SBOFF);
 188         extern int (*mountroot)();
 189
 190         /* check for valid super block */
 191         if (fs->fs_magic != FS_MAGIC || fs->fs_bsize > MAXBSIZE ||
 192             fs->fs_bsize < sizeof(struct fs))
 193                 return (0);
 194         mountroot = mfs_mountroot;
 195         mfs_rootbase = base;
 196         mfs_rootsize = fs->fs_fsize * fs->fs_size;
 197         rootdev = makedev(255, mfs_minor++);
 198         return (mfs_rootsize);
 199 }
 200
 201 /*
 202  * VFS Operations.
 203  *
 204  * mount system call
 205  */
 206 /* ARGSUSED */
 207 int
 208 mfs_mount(mp, path, data, ndp, p)
 209         register struct mount *mp;
 210         char *path;
 211         caddr_t data;
 212         struct nameidata *ndp;
 213         struct proc *p;
 214 {
 215         struct vnode *devvp;
 216         struct mfs_args args;
 217         struct ufsmount *ump;
 218         register struct fs *fs;
 219         register struct mfsnode *mfsp;
 220         size_t size;
 221         int flags, error;
 222
 223         if (error = copyin(data, (caddr_t)&args, sizeof (struct mfs_args)))
 224                 return (error);
 225
 226         /*
 227          * If updating, check whether changing from read-only to
 228          * read/write; if there is no device name, that's all we do.
 229          */
 230         if (mp->mnt_flag & MNT_UPDATE) {
 231                 ump = VFSTOUFS(mp);
 232                 fs = ump->um_fs;
 233                 if (fs->fs_ronly == 0 && (mp->mnt_flag & MNT_RDONLY)) {
 234                         flags = WRITECLOSE;
 235                         if (mp->mnt_flag & MNT_FORCE)
 236                                 flags |= FORCECLOSE;
 237                         if (vfs_busy(mp))
 238                                 return (EBUSY);
 239                         error = ffs_flushfiles(mp, flags, p);
 240                         vfs_unbusy(mp);
 241                         if (error)
 242                                 return (error);
 243                 }
 244                 if (fs->fs_ronly && (mp->mnt_kern_flag & MNTK_WANTRDWR))
 245                         fs->fs_ronly = 0;
 246 #ifdef EXPORTMFS
 247                 if (args.fspec == 0)
 248                         return (vfs_export(mp, &ump->um_export, &args.export));
 249 #endif
 250                 return (0);
 251         }
 252         MALLOC(mfsp, struct mfsnode *, sizeof(struct mfsnode), M_MFSNODE, M_WAITOK);
 253         error = getnewvnode(VT_MFS, (struct mount *)0, mfs_vnodeop_p, &devvp);
 254         if (error) {
 255                 FREE(mfsp, M_MFSNODE);
 256                 return (error);
 257         }
 258         devvp->v_type = VBLK;
 259         if (checkalias(devvp, makedev(255, mfs_minor++), (struct mount *)0))
 260                 panic("mfs_mount: dup dev");
 261         devvp->v_data = mfsp;
 262         mfsp->mfs_baseoff = args.base;
 263         mfsp->mfs_size = args.size;
 264         mfsp->mfs_vnode = devvp;
 265         mfsp->mfs_pid = p->p_pid;
 266         mfsp->mfs_buflist = (struct buf *)0;
 267         if (error = ffs_mountfs(devvp, mp, p)) {
 268                 mfsp->mfs_buflist = (struct buf *)-1;
 269                 vrele(devvp);
 270                 return (error);
 271         }
 272         ump = VFSTOUFS(mp);
 273         fs = ump->um_fs;
 274         (void) copyinstr(path, fs->fs_fsmnt, sizeof(fs->fs_fsmnt) - 1, &size);
 275         bzero(fs->fs_fsmnt + size, sizeof(fs->fs_fsmnt) - size);
 276         bcopy(fs->fs_fsmnt, mp->mnt_stat.f_mntonname, MNAMELEN);
 277         (void) copyinstr(args.fspec, mp->mnt_stat.f_mntfromname, MNAMELEN - 1,
 278             &size);
 279         bzero(mp->mnt_stat.f_mntfromname + size, MNAMELEN - size);
 280         return (0);
 281 }
 282
 283 int     mfs_pri = PWAIT | PCATCH;               /* XXX prob. temp */
 284
 285 /*
 286  * Used to grab the process and keep it in the kernel to service
 287  * memory filesystem I/O requests.
 288  *
 289  * Loop servicing I/O requests.
 290  * Copy the requested data into or out of the memory filesystem
 291  * address space.
 292  */
 293 /* ARGSUSED */
 294 int
 295 mfs_start(mp, flags, p)
 296         struct mount *mp;
 297         int flags;
 298         struct proc *p;
 299 {
 300         register struct vnode *vp = VFSTOUFS(mp)->um_devvp;
 301         register struct mfsnode *mfsp = VTOMFS(vp);
 302         register struct buf *bp;
 303         register caddr_t base;
 304         int error = 0;
 305
 306         base = mfsp->mfs_baseoff;
 307         while (mfsp->mfs_buflist != (struct buf *)(-1)) {
 308                 while (bp = mfsp->mfs_buflist) {
 309                         mfsp->mfs_buflist = bp->b_actf;
 310                         mfs_doio(bp, base);
 311                         wakeup((caddr_t)bp);
 312                 }
 313                 /*
 314                  * If a non-ignored signal is received, try to unmount.
 315                  * If that fails, clear the signal (it has been "processed"),
 316                  * otherwise we will loop here, as tsleep will always return
 317                  * EINTR/ERESTART.
 318                  */
 319                 if (error = tsleep((caddr_t)vp, mfs_pri, "mfsidl", 0))
 320                         if (dounmount(mp, 0, p) != 0)
 321                                 CLRSIG(p, CURSIG(p));
 322         }
 323         return (error);
 324 }
 325
 326 /*
 327  * Get file system statistics.
 328  */
 329 mfs_statfs(mp, sbp, p)
 330         struct mount *mp;
 331         struct statfs *sbp;
 332         struct proc *p;
 333 {
 334         int error;
 335
 336         error = ffs_statfs(mp, sbp, p);
 337 #ifdef COMPAT_09
 338         sbp->f_type = 3;
 339 #else
 340         sbp->f_type = 0;
 341 #endif
 342         strncpy(&sbp->f_fstypename[0], mp->mnt_op->vfs_name, MFSNAMELEN);
 343         sbp->f_fstypename[MFSNAMELEN] = '\0';
 344         return (error);
 345 }