mfs_vfsops.c revision 1.21.8.1
1 /* $NetBSD: mfs_vfsops.c,v 1.21.8.1 1999/12/21 23:20:10 wrstuden 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 8.11 (Berkeley) 6/19/95 36 */ 37 38 #if defined(_KERNEL) && !defined(_LKM) 39 #include "opt_compat_netbsd.h" 40 #endif 41 42 #include <sys/param.h> 43 #include <sys/systm.h> 44 #include <sys/time.h> 45 #include <sys/kernel.h> 46 #include <sys/proc.h> 47 #include <sys/buf.h> 48 #include <sys/mount.h> 49 #include <sys/signalvar.h> 50 #include <sys/vnode.h> 51 #include <sys/malloc.h> 52 53 #include <ufs/ufs/quota.h> 54 #include <ufs/ufs/inode.h> 55 #include <ufs/ufs/ufsmount.h> 56 #include <ufs/ufs/ufs_extern.h> 57 58 #include <ufs/ffs/fs.h> 59 #include <ufs/ffs/ffs_extern.h> 60 61 #include <ufs/mfs/mfsnode.h> 62 #include <ufs/mfs/mfs_extern.h> 63 64 #include <miscfs/specfs/specdev.h> 65 66 caddr_t mfs_rootbase; /* address of mini-root in kernel virtual memory */ 67 u_long mfs_rootsize; /* size of mini-root in bytes */ 68 69 static int mfs_minor; /* used for building internal dev_t */ 70 71 extern int (**mfs_vnodeop_p) __P((void *)); 72 73 /* 74 * mfs vfs operations. 75 */ 76 77 extern struct vnodeopv_desc mfs_vnodeop_opv_desc; 78 79 struct vnodeopv_desc *mfs_vnodeopv_descs[] = { 80 &mfs_vnodeop_opv_desc, 81 NULL, 82 }; 83 84 struct vfsops mfs_vfsops = { 85 MOUNT_MFS, 86 mfs_mount, 87 mfs_start, 88 ffs_unmount, 89 ufs_root, 90 ufs_quotactl, 91 mfs_statfs, 92 ffs_sync, 93 ffs_vget, 94 ffs_fhtovp, 95 ffs_vptofh, 96 mfs_init, 97 ffs_sysctl, 98 NULL, 99 ufs_check_export, 100 mfs_vnodeopv_descs, 101 }; 102 103 /* 104 * Memory based filesystem initialization. 105 */ 106 void 107 mfs_init() 108 { 109 } 110 111 112 /* 113 * Called by main() when mfs is going to be mounted as root. 114 */ 115 116 int 117 mfs_mountroot() 118 { 119 extern struct vnode *rootvp; 120 struct fs *fs; 121 struct mount *mp; 122 struct proc *p = curproc; /* XXX */ 123 struct ufsmount *ump; 124 struct mfsnode *mfsp; 125 int error = 0; 126 127 /* 128 * Get vnodes for rootdev. 129 */ 130 if (bdevvp(rootdev, &rootvp)) { 131 printf("mfs_mountroot: can't setup bdevvp's"); 132 return (error); 133 } 134 135 if ((error = vfs_rootmountalloc(MOUNT_MFS, "mfs_root", &mp))) { 136 vrele(rootvp); 137 return (error); 138 } 139 140 mfsp = malloc(sizeof *mfsp, M_MFSNODE, M_WAITOK); 141 rootvp->v_data = mfsp; 142 rootvp->v_op = mfs_vnodeop_p; 143 rootvp->v_tag = VT_MFS; 144 rootvp->v_specbshift = DEF_BSHIFT; /* XXX */ 145 mfsp->mfs_baseoff = mfs_rootbase; 146 mfsp->mfs_size = mfs_rootsize; 147 mfsp->mfs_vnode = rootvp; 148 mfsp->mfs_pid = p->p_pid; 149 mfsp->mfs_buflist = (struct buf *)0; 150 if ((error = ffs_mountfs(rootvp, mp, p)) != 0) { 151 mp->mnt_op->vfs_refcount--; 152 vfs_unbusy(mp); 153 free(mp, M_MOUNT); 154 free(mfsp, M_MFSNODE); 155 vrele(rootvp); 156 return (error); 157 } 158 simple_lock(&mountlist_slock); 159 CIRCLEQ_INSERT_TAIL(&mountlist, mp, mnt_list); 160 simple_unlock(&mountlist_slock); 161 mp->mnt_vnodecovered = NULLVP; 162 ump = VFSTOUFS(mp); 163 fs = ump->um_fs; 164 (void) copystr(mp->mnt_stat.f_mntonname, fs->fs_fsmnt, MNAMELEN - 1, 0); 165 (void)ffs_statfs(mp, &mp->mnt_stat, p); 166 vfs_unbusy(mp); 167 inittodr((time_t)0); 168 return (0); 169 } 170 171 /* 172 * This is called early in boot to set the base address and size 173 * of the mini-root. 174 */ 175 int 176 mfs_initminiroot(base) 177 caddr_t base; 178 { 179 struct fs *fs = (struct fs *)(base + SBOFF); 180 extern int (*mountroot) __P((void)); 181 182 /* check for valid super block */ 183 if (fs->fs_magic != FS_MAGIC || fs->fs_bsize > MAXBSIZE || 184 fs->fs_bsize < sizeof(struct fs)) 185 return (0); 186 mountroot = mfs_mountroot; 187 mfs_rootbase = base; 188 mfs_rootsize = fs->fs_fsize * fs->fs_size; 189 rootdev = makedev(255, mfs_minor++); 190 return (mfs_rootsize); 191 } 192 193 /* 194 * VFS Operations. 195 * 196 * mount system call 197 */ 198 /* ARGSUSED */ 199 int 200 mfs_mount(mp, path, data, ndp, p) 201 register struct mount *mp; 202 const char *path; 203 void *data; 204 struct nameidata *ndp; 205 struct proc *p; 206 { 207 struct vnode *devvp; 208 struct mfs_args args; 209 struct ufsmount *ump; 210 register struct fs *fs; 211 register struct mfsnode *mfsp; 212 size_t size; 213 int flags, error; 214 215 error = copyin(data, (caddr_t)&args, sizeof (struct mfs_args)); 216 if (error) 217 return (error); 218 219 /* 220 * If updating, check whether changing from read-only to 221 * read/write; if there is no device name, that's all we do. 222 */ 223 if (mp->mnt_flag & MNT_UPDATE) { 224 ump = VFSTOUFS(mp); 225 fs = ump->um_fs; 226 if (fs->fs_ronly == 0 && (mp->mnt_flag & MNT_RDONLY)) { 227 flags = WRITECLOSE; 228 if (mp->mnt_flag & MNT_FORCE) 229 flags |= FORCECLOSE; 230 error = ffs_flushfiles(mp, flags, p); 231 if (error) 232 return (error); 233 } 234 if (fs->fs_ronly && (mp->mnt_flag & MNT_WANTRDWR)) 235 fs->fs_ronly = 0; 236 if (args.fspec == 0) 237 return (vfs_export(mp, &ump->um_export, &args.export)); 238 return (0); 239 } 240 error = getnewvnode(VT_MFS, (struct mount *)0, mfs_vnodeop_p, &devvp); 241 if (error) 242 return (error); 243 devvp->v_type = VBLK; 244 if (checkalias(devvp, makedev(255, mfs_minor++), (struct mount *)0)) 245 panic("mfs_mount: dup dev"); 246 mfsp = (struct mfsnode *)malloc(sizeof *mfsp, M_MFSNODE, M_WAITOK); 247 devvp->v_specbshift = DEF_BSHIFT; /* XXX */ 248 devvp->v_data = mfsp; 249 mfsp->mfs_baseoff = args.base; 250 mfsp->mfs_size = args.size; 251 mfsp->mfs_vnode = devvp; 252 mfsp->mfs_pid = p->p_pid; 253 mfsp->mfs_buflist = (struct buf *)0; 254 if ((error = ffs_mountfs(devvp, mp, p)) != 0) { 255 mfsp->mfs_buflist = (struct buf *)-1; 256 vrele(devvp); 257 return (error); 258 } 259 ump = VFSTOUFS(mp); 260 fs = ump->um_fs; 261 (void) copyinstr(path, fs->fs_fsmnt, sizeof(fs->fs_fsmnt) - 1, &size); 262 memset(fs->fs_fsmnt + size, 0, sizeof(fs->fs_fsmnt) - size); 263 memcpy(mp->mnt_stat.f_mntonname, fs->fs_fsmnt, MNAMELEN); 264 (void) copyinstr(args.fspec, mp->mnt_stat.f_mntfromname, MNAMELEN - 1, 265 &size); 266 memset(mp->mnt_stat.f_mntfromname + size, 0, MNAMELEN - size); 267 return (0); 268 } 269 270 int mfs_pri = PWAIT | PCATCH; /* XXX prob. temp */ 271 272 /* 273 * Used to grab the process and keep it in the kernel to service 274 * memory filesystem I/O requests. 275 * 276 * Loop servicing I/O requests. 277 * Copy the requested data into or out of the memory filesystem 278 * address space. 279 */ 280 /* ARGSUSED */ 281 int 282 mfs_start(mp, flags, p) 283 struct mount *mp; 284 int flags; 285 struct proc *p; 286 { 287 register struct vnode *vp = VFSTOUFS(mp)->um_devvp; 288 register struct mfsnode *mfsp = VTOMFS(vp); 289 register struct buf *bp; 290 register caddr_t base; 291 int sleepreturn = 0; 292 293 base = mfsp->mfs_baseoff; 294 while (mfsp->mfs_buflist != (struct buf *)-1) { 295 /* 296 * If a non-ignored signal is received, try to unmount. 297 * If that fails, or the filesystem is already in the 298 * process of being unmounted, clear the signal (it has been 299 * "processed"), otherwise we will loop here, as tsleep 300 * will always return EINTR/ERESTART. 301 */ 302 if (sleepreturn != 0) { 303 if (vfs_busy(mp, LK_NOWAIT, 0) || 304 dounmount(mp, 0, p) != 0) 305 CLRSIG(p, CURSIG(p)); 306 sleepreturn = 0; 307 continue; 308 } 309 310 while ((bp = mfsp->mfs_buflist) != NULL) { 311 mfsp->mfs_buflist = bp->b_actf; 312 mfs_doio(bp, base); 313 wakeup((caddr_t)bp); 314 } 315 sleepreturn = tsleep(vp, mfs_pri, "mfsidl", 0); 316 } 317 return (sleepreturn); 318 } 319 320 /* 321 * Get file system statistics. 322 */ 323 int 324 mfs_statfs(mp, sbp, p) 325 struct mount *mp; 326 struct statfs *sbp; 327 struct proc *p; 328 { 329 int error; 330 331 error = ffs_statfs(mp, sbp, p); 332 #ifdef COMPAT_09 333 sbp->f_type = 3; 334 #else 335 sbp->f_type = 0; 336 #endif 337 strncpy(&sbp->f_fstypename[0], mp->mnt_op->vfs_name, MFSNAMELEN); 338 return (error); 339 } 340
Indexes created Sun Oct 19 02:09:48 GMT 2025