mfs_vfsops.c revision 1.38
1/* $NetBSD: mfs_vfsops.c,v 1.38 2002/03/04 02:25:24 simonb 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#include <sys/cdefs.h> 39__KERNEL_RCSID(0, "$NetBSD: mfs_vfsops.c,v 1.38 2002/03/04 02:25:24 simonb Exp $"); 40 41#if defined(_KERNEL_OPT) 42#include "opt_compat_netbsd.h" 43#endif 44 45#include <sys/param.h> 46#include <sys/systm.h> 47#include <sys/time.h> 48#include <sys/kernel.h> 49#include <sys/proc.h> 50#include <sys/buf.h> 51#include <sys/mount.h> 52#include <sys/signalvar.h> 53#include <sys/vnode.h> 54#include <sys/malloc.h> 55 56#include <miscfs/syncfs/syncfs.h> 57 58#include <ufs/ufs/quota.h> 59#include <ufs/ufs/inode.h> 60#include <ufs/ufs/ufsmount.h> 61#include <ufs/ufs/ufs_extern.h> 62 63#include <ufs/ffs/fs.h> 64#include <ufs/ffs/ffs_extern.h> 65 66#include <ufs/mfs/mfsnode.h> 67#include <ufs/mfs/mfs_extern.h> 68 69caddr_t mfs_rootbase; /* address of mini-root in kernel virtual memory */ 70u_long mfs_rootsize; /* size of mini-root in bytes */ 71 72static int mfs_minor; /* used for building internal dev_t */ 73 74extern int (**mfs_vnodeop_p) __P((void *)); 75 76/* 77 * mfs vfs operations. 78 */ 79 80extern const struct vnodeopv_desc mfs_vnodeop_opv_desc; 81 82const struct vnodeopv_desc * const mfs_vnodeopv_descs[] = { 83 &mfs_vnodeop_opv_desc, 84 NULL, 85}; 86 87struct vfsops mfs_vfsops = { 88 MOUNT_MFS, 89 mfs_mount, 90 mfs_start, 91 ffs_unmount, 92 ufs_root, 93 ufs_quotactl, 94 mfs_statfs, 95 ffs_sync, 96 ffs_vget, 97 ffs_fhtovp, 98 ffs_vptofh, 99 mfs_init, 100 mfs_reinit, 101 mfs_done, 102 ffs_sysctl, 103 NULL, 104 ufs_check_export, 105 mfs_vnodeopv_descs, 106}; 107 108/* 109 * Memory based filesystem initialization. 110 */ 111void 112mfs_init() 113{ 114 /* 115 * ffs_init() ensures to initialize necessary resources 116 * only once. 117 */ 118 ffs_init(); 119} 120 121void 122mfs_reinit() 123{ 124 ffs_reinit(); 125} 126 127void 128mfs_done() 129{ 130 /* 131 * ffs_done() ensures to free necessary resources 132 * only once, when it's no more needed. 133 */ 134 ffs_done(); 135} 136 137/* 138 * Called by main() when mfs is going to be mounted as root. 139 */ 140 141int 142mfs_mountroot() 143{ 144 struct fs *fs; 145 struct mount *mp; 146 struct proc *p = curproc; /* XXX */ 147 struct ufsmount *ump; 148 struct mfsnode *mfsp; 149 int error = 0; 150 151 /* 152 * Get vnodes for rootdev. 153 */ 154 if (bdevvp(rootdev, &rootvp)) { 155 printf("mfs_mountroot: can't setup bdevvp's"); 156 return (error); 157 } 158 159 if ((error = vfs_rootmountalloc(MOUNT_MFS, "mfs_root", &mp))) { 160 vrele(rootvp); 161 return (error); 162 } 163 164 mfsp = malloc(sizeof *mfsp, M_MFSNODE, M_WAITOK); 165 rootvp->v_data = mfsp; 166 rootvp->v_op = mfs_vnodeop_p; 167 rootvp->v_tag = VT_MFS; 168 mfsp->mfs_baseoff = mfs_rootbase; 169 mfsp->mfs_size = mfs_rootsize; 170 mfsp->mfs_vnode = rootvp; 171 mfsp->mfs_proc = NULL; /* indicate kernel space */ 172 BUFQ_INIT(&mfsp->mfs_buflist); 173 if ((error = ffs_mountfs(rootvp, mp, p)) != 0) { 174 mp->mnt_op->vfs_refcount--; 175 vfs_unbusy(mp); 176 free(mp, M_MOUNT); 177 free(mfsp, M_MFSNODE); 178 vrele(rootvp); 179 return (error); 180 } 181 simple_lock(&mountlist_slock); 182 CIRCLEQ_INSERT_TAIL(&mountlist, mp, mnt_list); 183 simple_unlock(&mountlist_slock); 184 mp->mnt_vnodecovered = NULLVP; 185 ump = VFSTOUFS(mp); 186 fs = ump->um_fs; 187 (void) copystr(mp->mnt_stat.f_mntonname, fs->fs_fsmnt, MNAMELEN - 1, 0); 188 (void)ffs_statfs(mp, &mp->mnt_stat, p); 189 vfs_unbusy(mp); 190 inittodr((time_t)0); 191 return (0); 192} 193 194/* 195 * This is called early in boot to set the base address and size 196 * of the mini-root. 197 */ 198int 199mfs_initminiroot(base) 200 caddr_t base; 201{ 202 struct fs *fs = (struct fs *)(base + SBOFF); 203 204 /* check for valid super block */ 205 if (fs->fs_magic != FS_MAGIC || fs->fs_bsize > MAXBSIZE || 206 fs->fs_bsize < sizeof(struct fs)) 207 return (0); 208 mountroot = mfs_mountroot; 209 mfs_rootbase = base; 210 mfs_rootsize = fs->fs_fsize * fs->fs_size; 211 rootdev = makedev(255, mfs_minor); 212 mfs_minor++; 213 return (mfs_rootsize); 214} 215 216/* 217 * VFS Operations. 218 * 219 * mount system call 220 */ 221/* ARGSUSED */ 222int 223mfs_mount(mp, path, data, ndp, p) 224 struct mount *mp; 225 const char *path; 226 void *data; 227 struct nameidata *ndp; 228 struct proc *p; 229{ 230 struct vnode *devvp; 231 struct mfs_args args; 232 struct ufsmount *ump; 233 struct fs *fs; 234 struct mfsnode *mfsp; 235 size_t size; 236 int flags, error; 237 238 /* 239 * XXX turn off async to avoid hangs when writing lots of data. 240 * the problem is that MFS needs to allocate pages to clean pages, 241 * so if we wait until the last minute to clean pages then there 242 * may not be any pages available to do the cleaning. 243 */ 244 mp->mnt_flag &= ~MNT_ASYNC; 245 246 error = copyin(data, (caddr_t)&args, sizeof (struct mfs_args)); 247 if (error) 248 return (error); 249 250 /* 251 * If updating, check whether changing from read-only to 252 * read/write; if there is no device name, that's all we do. 253 */ 254 if (mp->mnt_flag & MNT_UPDATE) { 255 ump = VFSTOUFS(mp); 256 fs = ump->um_fs; 257 if (fs->fs_ronly == 0 && (mp->mnt_flag & MNT_RDONLY)) { 258 flags = WRITECLOSE; 259 if (mp->mnt_flag & MNT_FORCE) 260 flags |= FORCECLOSE; 261 error = ffs_flushfiles(mp, flags, p); 262 if (error) 263 return (error); 264 } 265 if (fs->fs_ronly && (mp->mnt_flag & MNT_WANTRDWR)) 266 fs->fs_ronly = 0; 267 if (args.fspec == 0) 268 return (vfs_export(mp, &ump->um_export, &args.export)); 269 return (0); 270 } 271 error = getnewvnode(VT_MFS, (struct mount *)0, mfs_vnodeop_p, &devvp); 272 if (error) 273 return (error); 274 devvp->v_type = VBLK; 275 if (checkalias(devvp, makedev(255, mfs_minor), (struct mount *)0)) 276 panic("mfs_mount: dup dev"); 277 mfs_minor++; 278 mfsp = (struct mfsnode *)malloc(sizeof *mfsp, M_MFSNODE, M_WAITOK); 279 devvp->v_data = mfsp; 280 mfsp->mfs_baseoff = args.base; 281 mfsp->mfs_size = args.size; 282 mfsp->mfs_vnode = devvp; 283 mfsp->mfs_proc = p; 284 BUFQ_INIT(&mfsp->mfs_buflist); 285 if ((error = ffs_mountfs(devvp, mp, p)) != 0) { 286 BUFQ_FIRST(&mfsp->mfs_buflist) = (struct buf *) -1; 287 vrele(devvp); 288 return (error); 289 } 290 ump = VFSTOUFS(mp); 291 fs = ump->um_fs; 292 (void) copyinstr(path, fs->fs_fsmnt, sizeof(fs->fs_fsmnt) - 1, &size); 293 memset(fs->fs_fsmnt + size, 0, sizeof(fs->fs_fsmnt) - size); 294 memcpy(mp->mnt_stat.f_mntonname, fs->fs_fsmnt, MNAMELEN); 295 (void) copyinstr(args.fspec, mp->mnt_stat.f_mntfromname, MNAMELEN - 1, 296 &size); 297 memset(mp->mnt_stat.f_mntfromname + size, 0, MNAMELEN - size); 298 return (0); 299} 300 301int mfs_pri = PWAIT | PCATCH; /* XXX prob. temp */ 302 303/* 304 * Used to grab the process and keep it in the kernel to service 305 * memory filesystem I/O requests. 306 * 307 * Loop servicing I/O requests. 308 * Copy the requested data into or out of the memory filesystem 309 * address space. 310 */ 311/* ARGSUSED */ 312int 313mfs_start(mp, flags, p) 314 struct mount *mp; 315 int flags; 316 struct proc *p; 317{ 318 struct vnode *vp = VFSTOUFS(mp)->um_devvp; 319 struct mfsnode *mfsp = VTOMFS(vp); 320 struct buf *bp; 321 caddr_t base; 322 int sleepreturn = 0; 323 324 base = mfsp->mfs_baseoff; 325 while (BUFQ_FIRST(&mfsp->mfs_buflist) != (struct buf *) -1) { 326 while ((bp = BUFQ_FIRST(&mfsp->mfs_buflist)) != NULL) { 327 BUFQ_REMOVE(&mfsp->mfs_buflist, bp); 328 mfs_doio(bp, base); 329 wakeup((caddr_t)bp); 330 } 331 /* 332 * If a non-ignored signal is received, try to unmount. 333 * If that fails, or the filesystem is already in the 334 * process of being unmounted, clear the signal (it has been 335 * "processed"), otherwise we will loop here, as tsleep 336 * will always return EINTR/ERESTART. 337 */ 338 if (sleepreturn != 0) { 339 /* 340 * XXX Freeze syncer. Must do this before locking 341 * the mount point. See dounmount() for details. 342 */ 343 lockmgr(&syncer_lock, LK_EXCLUSIVE, NULL); 344 if (vfs_busy(mp, LK_NOWAIT, 0) != 0) 345 lockmgr(&syncer_lock, LK_RELEASE, NULL); 346 else if (dounmount(mp, 0, p) != 0) 347 CLRSIG(p, CURSIG(p)); 348 sleepreturn = 0; 349 continue; 350 } 351 352 sleepreturn = tsleep(vp, mfs_pri, "mfsidl", 0); 353 } 354 return (sleepreturn); 355} 356 357/* 358 * Get file system statistics. 359 */ 360int 361mfs_statfs(mp, sbp, p) 362 struct mount *mp; 363 struct statfs *sbp; 364 struct proc *p; 365{ 366 int error; 367 368 error = ffs_statfs(mp, sbp, p); 369#ifdef COMPAT_09 370 sbp->f_type = 3; 371#else 372 sbp->f_type = 0; 373#endif 374 strncpy(&sbp->f_fstypename[0], mp->mnt_op->vfs_name, MFSNAMELEN); 375 return (error); 376} 377