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  * Copyright (c) 1999-2003 Apple Computer, Inc.  All Rights Reserved.
   7  *
   8  * This file contains Original Code and/or Modifications of Original Code
   9  * as defined in and that are subject to the Apple Public Source License
  10  * Version 2.0 (the 'License'). You may not use this file except in
  11  * compliance with the License. Please obtain a copy of the License at
  12  * http://www.opensource.apple.com/apsl/ and read it before using this
  13  * file.
  14  *
  15  * The Original Code and all software distributed under the License are
  16  * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  17  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  18  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  19  * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
  20  * Please see the License for the specific language governing rights and
  21  * limitations under the License.
  22  *
  23  * @APPLE_LICENSE_HEADER_END@
  24  */
  25 /* Copyright (c) 1995 NeXT Computer, Inc. All Rights Reserved */
  26 /*
  27  * Copyright (c) 1989, 1990, 1993, 1994
  28  *      The Regents of the University of California.  All rights reserved.
  29  *
  30  * Redistribution and use in source and binary forms, with or without
  31  * modification, are permitted provided that the following conditions
  32  * are met:
  33  * 1. Redistributions of source code must retain the above copyright
  34  *    notice, this list of conditions and the following disclaimer.
  35  * 2. Redistributions in binary form must reproduce the above copyright
  36  *    notice, this list of conditions and the following disclaimer in the
  37  *    documentation and/or other materials provided with the distribution.
  38  * 3. All advertising materials mentioning features or use of this software
  39  *    must display the following acknowledgement:
  40  *      This product includes software developed by the University of
  41  *      California, Berkeley and its contributors.
  42  * 4. Neither the name of the University nor the names of its contributors
  43  *    may be used to endorse or promote products derived from this software
  44  *    without specific prior written permission.
  45  *
  46  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  47  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  48  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  49  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  50  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  51  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  52  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  53  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  54  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  55  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  56  * SUCH DAMAGE.
  57  *
  58  *      @(#)mfs_vfsops.c        8.4 (Berkeley) 4/16/94
  59  */
  60
  61 #include <sys/param.h>
  62 #include <sys/systm.h>
  63 #include <sys/time.h>
  64 #include <sys/kernel.h>
  65 #include <sys/proc.h>
  66 #include <sys/buf.h>
  67 #include <sys/mount.h>
  68 #include <sys/signalvar.h>
  69 #include <sys/vnode.h>
  70 #include <sys/malloc.h>
  71
  72 #include <ufs/ufs/quota.h>
  73 #include <ufs/ufs/inode.h>
  74 #include <ufs/ufs/ufsmount.h>
  75 #include <ufs/ufs/ufs_extern.h>
  76
  77 #include <ufs/ffs/fs.h>
  78 #include <ufs/ffs/ffs_extern.h>
  79
  80 #include <ufs/mfs/mfsnode.h>
  81 #include <ufs/mfs/mfs_extern.h>
  82
  83 caddr_t mfs_rootbase;   /* address of mini-root in kernel virtual memory */
  84 u_long  mfs_rootsize;   /* size of mini-root in bytes */
  85
  86 static  int mfs_minor;  /* used for building internal dev_t */
  87
  88 extern int (**mfs_vnodeop_p)(void *);
  89
  90 /*
  91  * mfs vfs operations.
  92  */
  93 struct vfsops mfs_vfsops = {
  94         MOUNT_MFS,
  95         mfs_mount,
  96         mfs_start,
  97         ffs_unmount,
  98         ufs_root,
  99         ufs_quotactl,
 100         mfs_statfs,
 101         ffs_sync,
 102         ffs_vget,
 103         ffs_fhtovp,
 104         ffs_vptofh,
 105         mfs_init,
 106 };
 107
 108 /*
 109  * Called by main() when mfs is going to be mounted as root.
 110  *
 111  * Name is updated by mount(8) after booting.
 112  */
 113 #define ROOTNAME        "mfs_root"
 114
 115 mfs_mountroot()
 116 {
 117         extern struct vnode *rootvp;
 118         register struct fs *fs;
 119         register struct mount *mp;
 120         struct proc *p = kernel_proc;   /* XXX - WMG*/
 121         struct ufsmount *ump;
 122         struct mfsnode *mfsp;
 123         size_t size;
 124         int error;
 125
 126         /*
 127          * Get vnodes for swapdev and rootdev.
 128          */
 129 #if 0
 130         if (bdevvp(swapdev, &swapdev_vp) || bdevvp(rootdev, &rootvp))
 131                 panic("mfs_mountroot: can't setup bdevvp's");
 132 #else
 133         if ( bdevvp(rootdev, &rootvp))
 134                 panic("mfs_mountroot: can't setup bdevvp's");
 135
 136 #endif
 137         MALLOC_ZONE(mp, struct mount *,
 138                         sizeof(struct mount), M_MOUNT, M_WAITOK);
 139         bzero((char *)mp, (u_long)sizeof(struct mount));
 140
 141     /* Initialize the default IO constraints */
 142     mp->mnt_maxreadcnt = mp->mnt_maxwritecnt = MAXPHYS;
 143     mp->mnt_segreadcnt = mp->mnt_segwritecnt = 32;
 144
 145         mp->mnt_op = &mfs_vfsops;
 146         mp->mnt_flag = MNT_RDONLY;
 147         MALLOC(mfsp, struct mfsnode *, sizeof(struct mfsnode), M_MFSNODE, M_WAITOK);
 148         rootvp->v_data = mfsp;
 149         rootvp->v_op = mfs_vnodeop_p;
 150         rootvp->v_tag = VT_MFS;
 151         mfsp->mfs_baseoff = mfs_rootbase;
 152         mfsp->mfs_size = mfs_rootsize;
 153         mfsp->mfs_vnode = rootvp;
 154         mfsp->mfs_pid = p->p_pid;
 155         mfsp->mfs_buflist = (struct buf *)0;
 156         if (error = ffs_mountfs(rootvp, mp, p)) {
 157                 vrele(rootvp); /* release the reference from bdevvp() */
 158                 _FREE_ZONE(mp, sizeof (struct mount), M_MOUNT);
 159                 _FREE(mfsp, M_MFSNODE);
 160                 return (error);
 161         }
 162         if (error = vfs_lock(mp)) {
 163                 (void)ffs_unmount(mp, 0, p);
 164                 _FREE_ZONE(mp, sizeof (struct mount), M_MOUNT);
 165                 _FREE(mfsp, M_MFSNODE);
 166                 return (error);
 167         }
 168         CIRCLEQ_INSERT_TAIL(&mountlist, mp, mnt_list);
 169         mp->mnt_vnodecovered = NULLVP;
 170         ump = VFSTOUFS(mp);
 171         fs = ump->um_fs;
 172         bzero(fs->fs_fsmnt, sizeof(fs->fs_fsmnt));
 173         fs->fs_fsmnt[0] = '/';
 174         bcopy(fs->fs_fsmnt, mp->mnt_stat.f_mntonname, MNAMELEN);
 175         (void) copystr(ROOTNAME, mp->mnt_stat.f_mntfromname, MNAMELEN - 1,
 176             &size);
 177         bzero(mp->mnt_stat.f_mntfromname + size, MNAMELEN - size);
 178         (void)ffs_statfs(mp, &mp->mnt_stat, p);
 179         vfs_unlock(mp);
 180         inittodr((time_t)0);
 181         return (0);
 182 }
 183
 184 /*
 185  * This is called early in boot to set the base address and size
 186  * of the mini-root.
 187  */
 188 mfs_initminiroot(base)
 189         caddr_t base;
 190 {
 191         struct fs *fs = (struct fs *)(base + SBOFF);
 192         extern int (*mountroot)();
 193
 194         /* check for valid super block */
 195         if (fs->fs_magic != FS_MAGIC || fs->fs_bsize > MAXBSIZE ||
 196             fs->fs_bsize < sizeof(struct fs))
 197                 return (0);
 198         mountroot = mfs_mountroot;
 199         mfs_rootbase = base;
 200         mfs_rootsize = fs->fs_fsize * fs->fs_size;
 201         rootdev = makedev(255, mfs_minor++);
 202         return (mfs_rootsize);
 203 }
 204
 205 /*
 206  * VFS Operations.
 207  *
 208  * mount system call
 209  */
 210 /* ARGSUSED */
 211 int
 212 mfs_mount(mp, path, data, ndp, p)
 213         register struct mount *mp;
 214         char *path;
 215         caddr_t data;
 216         struct nameidata *ndp;
 217         struct proc *p;
 218 {
 219         struct vnode *devvp;
 220         struct mfs_args args;
 221         struct ufsmount *ump;
 222         register struct fs *fs;
 223         register struct mfsnode *mfsp;
 224         size_t size;
 225         int flags, error;
 226
 227         if (error = copyin(data, (caddr_t)&args, sizeof (struct mfs_args)))
 228                 return (error);
 229
 230         /*
 231          * If updating, check whether changing from read-only to
 232          * read/write; if there is no device name, that's all we do.
 233          */
 234         if (mp->mnt_flag & MNT_UPDATE) {
 235                 ump = VFSTOUFS(mp);
 236                 fs = ump->um_fs;
 237                 if (fs->fs_ronly == 0 && (mp->mnt_flag & MNT_RDONLY)) {
 238                         flags = WRITECLOSE;
 239                         if (mp->mnt_flag & MNT_FORCE)
 240                                 flags |= FORCECLOSE;
 241                         if (vfs_busy(mp))
 242                                 return (EBUSY);
 243                         error = ffs_flushfiles(mp, flags, p);
 244                         vfs_unbusy(mp);
 245                         if (error)
 246                                 return (error);
 247                 }
 248                 if (fs->fs_ronly && (mp->mnt_kern_flag & MNTK_WANTRDWR))
 249                         fs->fs_ronly = 0;
 250 #ifdef EXPORTMFS
 251                 if (args.fspec == 0)
 252                         return (vfs_export(mp, &ump->um_export, &args.export));
 253 #endif
 254                 return (0);
 255         }
 256         MALLOC(mfsp, struct mfsnode *, sizeof(struct mfsnode), M_MFSNODE, M_WAITOK);
 257         error = getnewvnode(VT_MFS, (struct mount *)0, mfs_vnodeop_p, &devvp);
 258         if (error) {
 259                 FREE(mfsp, M_MFSNODE);
 260                 return (error);
 261         }
 262         devvp->v_type = VBLK;
 263         if (checkalias(devvp, makedev(255, mfs_minor++), (struct mount *)0))
 264                 panic("mfs_mount: dup dev");
 265         devvp->v_data = mfsp;
 266         mfsp->mfs_baseoff = args.base;
 267         mfsp->mfs_size = args.size;
 268         mfsp->mfs_vnode = devvp;
 269         mfsp->mfs_pid = p->p_pid;
 270         mfsp->mfs_buflist = (struct buf *)0;
 271         if (error = ffs_mountfs(devvp, mp, p)) {
 272                 mfsp->mfs_buflist = (struct buf *)-1;
 273                 vrele(devvp);
 274                 return (error);
 275         }
 276         ump = VFSTOUFS(mp);
 277         fs = ump->um_fs;
 278         (void) copyinstr(path, fs->fs_fsmnt, sizeof(fs->fs_fsmnt) - 1, &size);
 279         bzero(fs->fs_fsmnt + size, sizeof(fs->fs_fsmnt) - size);
 280         bcopy(fs->fs_fsmnt, mp->mnt_stat.f_mntonname, MNAMELEN);
 281         (void) copyinstr(args.fspec, mp->mnt_stat.f_mntfromname, MNAMELEN - 1,
 282             &size);
 283         bzero(mp->mnt_stat.f_mntfromname + size, MNAMELEN - size);
 284         return (0);
 285 }
 286
 287 int     mfs_pri = PWAIT | PCATCH;               /* XXX prob. temp */
 288
 289 /*
 290  * Used to grab the process and keep it in the kernel to service
 291  * memory filesystem I/O requests.
 292  *
 293  * Loop servicing I/O requests.
 294  * Copy the requested data into or out of the memory filesystem
 295  * address space.
 296  */
 297 /* ARGSUSED */
 298 int
 299 mfs_start(mp, flags, p)
 300         struct mount *mp;
 301         int flags;
 302         struct proc *p;
 303 {
 304         register struct vnode *vp = VFSTOUFS(mp)->um_devvp;
 305         register struct mfsnode *mfsp = VTOMFS(vp);
 306         register struct buf *bp;
 307         register caddr_t base;
 308         int error = 0;
 309
 310         base = mfsp->mfs_baseoff;
 311         while (mfsp->mfs_buflist != (struct buf *)(-1)) {
 312                 while (bp = mfsp->mfs_buflist) {
 313                         mfsp->mfs_buflist = bp->b_actf;
 314                         mfs_doio(bp, base);
 315                         wakeup((caddr_t)bp);
 316                 }
 317                 /*
 318                  * If a non-ignored signal is received, try to unmount.
 319                  * If that fails, clear the signal (it has been "processed"),
 320                  * otherwise we will loop here, as tsleep will always return
 321                  * EINTR/ERESTART.
 322                  */
 323                 if (error = tsleep((caddr_t)vp, mfs_pri, "mfsidl", 0))
 324                         if (dounmount(mp, 0, p) != 0)
 325                                 CLRSIG(p, CURSIG(p));
 326         }
 327         return (error);
 328 }
 329
 330 /*
 331  * Get file system statistics.
 332  */
 333 mfs_statfs(mp, sbp, p)
 334         struct mount *mp;
 335         struct statfs *sbp;
 336         struct proc *p;
 337 {
 338         int error;
 339
 340         error = ffs_statfs(mp, sbp, p);
 341 #ifdef COMPAT_09
 342         sbp->f_type = 3;
 343 #else
 344         sbp->f_type = 0;
 345 #endif
 346         strncpy(&sbp->f_fstypename[0], mp->mnt_op->vfs_name, MFSNAMELEN);
 347         sbp->f_fstypename[MFSNAMELEN] = '\0';
 348         return (error);
 349 }