mfs_vfsops.c revision 1.13
1/* $NetBSD: mfs_vfsops.c,v 1.13 1997/06/12 17:15:00 mrg Exp $ */ 2 3/* 4 * Copyright (c) 1989, 1990, 1993, 1994 5 * The Regents of the University of California. All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 3. All advertising materials mentioning features or use of this software 16 * must display the following acknowledgement: 17 * This product includes software developed by the University of 18 * California, Berkeley and its contributors. 19 * 4. Neither the name of the University nor the names of its contributors 20 * may be used to endorse or promote products derived from this software 21 * without specific prior written permission. 22 * 23 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 26 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 33 * SUCH DAMAGE. 34 * 35 * @(#)mfs_vfsops.c 8.4 (Berkeley) 4/16/94 36 */ 37 38#include <sys/param.h> 39#include <sys/systm.h> 40#include <sys/time.h> 41#include <sys/kernel.h> 42#include <sys/proc.h> 43#include <sys/buf.h> 44#include <sys/mount.h> 45#include <sys/signalvar.h> 46#include <sys/vnode.h> 47#include <sys/malloc.h> 48 49#include <ufs/ufs/quota.h> 50#include <ufs/ufs/inode.h> 51#include <ufs/ufs/ufsmount.h> 52#include <ufs/ufs/ufs_extern.h> 53 54#include <ufs/ffs/fs.h> 55#include <ufs/ffs/ffs_extern.h> 56 57#include <ufs/mfs/mfsnode.h> 58#include <ufs/mfs/mfs_extern.h> 59 60caddr_t mfs_rootbase; /* address of mini-root in kernel virtual memory */ 61u_long mfs_rootsize; /* size of mini-root in bytes */ 62 63static int mfs_minor; /* used for building internal dev_t */ 64 65extern int (**mfs_vnodeop_p) __P((void *)); 66 67/* 68 * mfs vfs operations. 69 */ 70struct vfsops mfs_vfsops = { 71 MOUNT_MFS, 72 mfs_mount, 73 mfs_start, 74 ffs_unmount, 75 ufs_root, 76 ufs_quotactl, 77 mfs_statfs, 78 ffs_sync, 79 ffs_vget, 80 ffs_fhtovp, 81 ffs_vptofh, 82 mfs_init, 83}; 84 85/* 86 * Called by main() when mfs is going to be mounted as root. 87 * 88 * Name is updated by mount(8) after booting. 89 */ 90#define ROOTNAME "mfs_root" 91 92int 93mfs_mountroot() 94{ 95 extern struct vnode *rootvp; 96 register struct fs *fs; 97 register struct mount *mp; 98 struct proc *p = curproc; /* XXX */ 99 struct ufsmount *ump; 100 struct mfsnode *mfsp; 101 size_t size; 102 int error; 103 104 /* 105 * Get vnodes for rootdev. 106 */ 107 if (bdevvp(rootdev, &rootvp)) 108 panic("mfs_mountroot: can't setup bdevvp's"); 109 110 mp = malloc((u_long)sizeof(struct mount), M_MOUNT, M_WAITOK); 111 bzero((char *)mp, (u_long)sizeof(struct mount)); 112 mp->mnt_op = &mfs_vfsops; 113 mp->mnt_flag = MNT_RDONLY; 114 mfsp = malloc(sizeof *mfsp, M_MFSNODE, M_WAITOK); 115 rootvp->v_data = mfsp; 116 rootvp->v_op = mfs_vnodeop_p; 117 rootvp->v_tag = VT_MFS; 118 mfsp->mfs_baseoff = mfs_rootbase; 119 mfsp->mfs_size = mfs_rootsize; 120 mfsp->mfs_vnode = rootvp; 121 mfsp->mfs_pid = p->p_pid; 122 mfsp->mfs_buflist = (struct buf *)0; 123 if ((error = ffs_mountfs(rootvp, mp, p)) != 0) { 124 free(mp, M_MOUNT); 125 free(mfsp, M_MFSNODE); 126 return (error); 127 } 128 if ((error = vfs_lock(mp)) != 0) { 129 (void)ffs_unmount(mp, 0, p); 130 free(mp, M_MOUNT); 131 free(mfsp, M_MFSNODE); 132 return (error); 133 } 134 CIRCLEQ_INSERT_TAIL(&mountlist, mp, mnt_list); 135 mp->mnt_vnodecovered = NULLVP; 136 ump = VFSTOUFS(mp); 137 fs = ump->um_fs; 138 bzero(fs->fs_fsmnt, sizeof(fs->fs_fsmnt)); 139 fs->fs_fsmnt[0] = '/'; 140 bcopy(fs->fs_fsmnt, mp->mnt_stat.f_mntonname, MNAMELEN); 141 (void) copystr(ROOTNAME, mp->mnt_stat.f_mntfromname, MNAMELEN - 1, 142 &size); 143 bzero(mp->mnt_stat.f_mntfromname + size, MNAMELEN - size); 144 (void)ffs_statfs(mp, &mp->mnt_stat, p); 145 vfs_unlock(mp); 146 inittodr((time_t)0); 147 return (0); 148} 149 150/* 151 * This is called early in boot to set the base address and size 152 * of the mini-root. 153 */ 154int 155mfs_initminiroot(base) 156 caddr_t base; 157{ 158 struct fs *fs = (struct fs *)(base + SBOFF); 159 extern int (*mountroot) __P((void)); 160 161 /* check for valid super block */ 162 if (fs->fs_magic != FS_MAGIC || fs->fs_bsize > MAXBSIZE || 163 fs->fs_bsize < sizeof(struct fs)) 164 return (0); 165 mountroot = mfs_mountroot; 166 mfs_rootbase = base; 167 mfs_rootsize = fs->fs_fsize * fs->fs_size; 168 rootdev = makedev(255, mfs_minor++); 169 return (mfs_rootsize); 170} 171 172/* 173 * VFS Operations. 174 * 175 * mount system call 176 */ 177/* ARGSUSED */ 178int 179mfs_mount(mp, path, data, ndp, p) 180 register struct mount *mp; 181 const char *path; 182 void *data; 183 struct nameidata *ndp; 184 struct proc *p; 185{ 186 struct vnode *devvp; 187 struct mfs_args args; 188 struct ufsmount *ump; 189 register struct fs *fs; 190 register struct mfsnode *mfsp; 191 size_t size; 192 int flags, error; 193 194 error = copyin(data, (caddr_t)&args, sizeof (struct mfs_args)); 195 if (error) 196 return (error); 197 198 /* 199 * If updating, check whether changing from read-only to 200 * read/write; if there is no device name, that's all we do. 201 */ 202 if (mp->mnt_flag & MNT_UPDATE) { 203 ump = VFSTOUFS(mp); 204 fs = ump->um_fs; 205 if (fs->fs_ronly == 0 && (mp->mnt_flag & MNT_RDONLY)) { 206 flags = WRITECLOSE; 207 if (mp->mnt_flag & MNT_FORCE) 208 flags |= FORCECLOSE; 209 if (vfs_busy(mp)) 210 return (EBUSY); 211 error = ffs_flushfiles(mp, flags, p); 212 vfs_unbusy(mp); 213 if (error) 214 return (error); 215 } 216 if (fs->fs_ronly && (mp->mnt_flag & MNT_WANTRDWR)) 217 fs->fs_ronly = 0; 218#ifdef EXPORTMFS 219 if (args.fspec == 0) 220 return (vfs_export(mp, &ump->um_export, &args.export)); 221#endif 222 return (0); 223 } 224 error = getnewvnode(VT_MFS, (struct mount *)0, mfs_vnodeop_p, &devvp); 225 if (error) 226 return (error); 227 devvp->v_type = VBLK; 228 if (checkalias(devvp, makedev(255, mfs_minor++), (struct mount *)0)) 229 panic("mfs_mount: dup dev"); 230 mfsp = (struct mfsnode *)malloc(sizeof *mfsp, M_MFSNODE, M_WAITOK); 231 devvp->v_data = mfsp; 232 mfsp->mfs_baseoff = args.base; 233 mfsp->mfs_size = args.size; 234 mfsp->mfs_vnode = devvp; 235 mfsp->mfs_pid = p->p_pid; 236 mfsp->mfs_buflist = (struct buf *)0; 237 if ((error = ffs_mountfs(devvp, mp, p)) != 0) { 238 mfsp->mfs_buflist = (struct buf *)-1; 239 vrele(devvp); 240 return (error); 241 } 242 ump = VFSTOUFS(mp); 243 fs = ump->um_fs; 244 (void) copyinstr(path, fs->fs_fsmnt, sizeof(fs->fs_fsmnt) - 1, &size); 245 bzero(fs->fs_fsmnt + size, sizeof(fs->fs_fsmnt) - size); 246 bcopy(fs->fs_fsmnt, mp->mnt_stat.f_mntonname, MNAMELEN); 247 (void) copyinstr(args.fspec, mp->mnt_stat.f_mntfromname, MNAMELEN - 1, 248 &size); 249 bzero(mp->mnt_stat.f_mntfromname + size, MNAMELEN - size); 250 return (0); 251} 252 253int mfs_pri = PWAIT | PCATCH; /* XXX prob. temp */ 254 255/* 256 * Used to grab the process and keep it in the kernel to service 257 * memory filesystem I/O requests. 258 * 259 * Loop servicing I/O requests. 260 * Copy the requested data into or out of the memory filesystem 261 * address space. 262 */ 263/* ARGSUSED */ 264int 265mfs_start(mp, flags, p) 266 struct mount *mp; 267 int flags; 268 struct proc *p; 269{ 270 register struct vnode *vp = VFSTOUFS(mp)->um_devvp; 271 register struct mfsnode *mfsp = VTOMFS(vp); 272 register struct buf *bp; 273 register caddr_t base; 274 int error = 0; 275 276 base = mfsp->mfs_baseoff; 277 while (mfsp->mfs_buflist != (struct buf *)-1) { 278 while ((bp = mfsp->mfs_buflist) != NULL) { 279 mfsp->mfs_buflist = bp->b_actf; 280 mfs_doio(bp, base); 281 wakeup((caddr_t)bp); 282 } 283 /* 284 * If a non-ignored signal is received, try to unmount. 285 * If that fails, clear the signal (it has been "processed"), 286 * otherwise we will loop here, as tsleep will always return 287 * EINTR/ERESTART. 288 */ 289 if (error == EINTR || error == ERESTART) { 290 if (vfs_busy(mp) == 0 && dounmount(mp, 0, p) != 0) 291 CLRSIG(p, CURSIG(p)); 292 error = 0; 293 continue; 294 } 295 error = tsleep((caddr_t)vp, mfs_pri, "mfsidl", 0); 296 } 297 return (error); 298} 299 300/* 301 * Get file system statistics. 302 */ 303int 304mfs_statfs(mp, sbp, p) 305 struct mount *mp; 306 struct statfs *sbp; 307 struct proc *p; 308{ 309 int error; 310 311 error = ffs_statfs(mp, sbp, p); 312#ifdef COMPAT_09 313 sbp->f_type = 3; 314#else 315 sbp->f_type = 0; 316#endif 317 strncpy(&sbp->f_fstypename[0], mp->mnt_op->vfs_name, MFSNAMELEN); 318 return (error); 319} 320