1 /* $NetBSD: mfs_vfsops.c,v 1.48 2003/04/22 17:16:21 christos 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 1.48 2003/04/22 17:16:21 christos 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 69 caddr_t mfs_rootbase; /* address of mini-root in kernel virtual memory */ 70 u_long mfs_rootsize; /* size of mini-root in bytes */ 71 72 static int mfs_minor; /* used for building internal dev_t */ 73 74 extern int (**mfs_vnodeop_p) __P((void *)); 75 76 MALLOC_DEFINE(M_MFSNODE, "MFS node", "MFS vnode private part"); 77 78 /* 79 * mfs vfs operations. 80 */ 81 82 extern const struct vnodeopv_desc mfs_vnodeop_opv_desc; 83 84 const struct vnodeopv_desc * const mfs_vnodeopv_descs[] = { 85 &mfs_vnodeop_opv_desc, 86 NULL, 87 }; 88 89 struct vfsops mfs_vfsops = { 90 MOUNT_MFS, 91 mfs_mount, 92 mfs_start, 93 ffs_unmount, 94 ufs_root, 95 ufs_quotactl, 96 mfs_statfs, 97 ffs_sync, 98 ffs_vget, 99 ffs_fhtovp, 100 ffs_vptofh, 101 mfs_init, 102 mfs_reinit, 103 mfs_done, 104 ffs_sysctl, 105 NULL, 106 ufs_check_export, 107 mfs_vnodeopv_descs, 108 }; 109 110 /* 111 * Memory based filesystem initialization. 112 */ 113 void 114 mfs_init() 115 { 116 #ifdef _LKM 117 malloc_type_attach(M_MFSNODE); 118 #endif 119 /* 120 * ffs_init() ensures to initialize necessary resources 121 * only once. 122 */ 123 ffs_init(); 124 } 125 126 void 127 mfs_reinit() 128 { 129 ffs_reinit(); 130 } 131 132 void 133 mfs_done() 134 { 135 /* 136 * ffs_done() ensures to free necessary resources 137 * only once, when it's no more needed. 138 */ 139 ffs_done(); 140 #ifdef _LKM 141 malloc_type_detach(M_MFSNODE); 142 #endif 143 } 144 145 /* 146 * Called by main() when mfs is going to be mounted as root. 147 */ 148 149 int 150 mfs_mountroot() 151 { 152 struct fs *fs; 153 struct mount *mp; 154 struct proc *p = curproc; /* XXX */ 155 struct ufsmount *ump; 156 struct mfsnode *mfsp; 157 int error = 0; 158 159 /* 160 * Get vnodes for rootdev. 161 */ 162 if (bdevvp(rootdev, &rootvp)) { 163 printf("mfs_mountroot: can't setup bdevvp's"); 164 return (error); 165 } 166 167 if ((error = vfs_rootmountalloc(MOUNT_MFS, "mfs_root", &mp))) { 168 vrele(rootvp); 169 return (error); 170 } 171 172 mfsp = malloc(sizeof *mfsp, M_MFSNODE, M_WAITOK); 173 rootvp->v_data = mfsp; 174 rootvp->v_op = mfs_vnodeop_p; 175 rootvp->v_tag = VT_MFS; 176 mfsp->mfs_baseoff = mfs_rootbase; 177 mfsp->mfs_size = mfs_rootsize; 178 mfsp->mfs_vnode = rootvp; 179 mfsp->mfs_proc = NULL; /* indicate kernel space */ 180 mfsp->mfs_shutdown = 0; 181 bufq_alloc(&mfsp->mfs_buflist, BUFQ_FCFS); 182 if ((error = ffs_mountfs(rootvp, mp, p)) != 0) { 183 mp->mnt_op->vfs_refcount--; 184 vfs_unbusy(mp); 185 bufq_free(&mfsp->mfs_buflist); 186 free(mp, M_MOUNT); 187 free(mfsp, M_MFSNODE); 188 vrele(rootvp); 189 return (error); 190 } 191 simple_lock(&mountlist_slock); 192 CIRCLEQ_INSERT_TAIL(&mountlist, mp, mnt_list); 193 simple_unlock(&mountlist_slock); 194 mp->mnt_vnodecovered = NULLVP; 195 ump = VFSTOUFS(mp); 196 fs = ump->um_fs; 197 (void) copystr(mp->mnt_stat.f_mntonname, fs->fs_fsmnt, MNAMELEN - 1, 0); 198 (void)ffs_statfs(mp, &mp->mnt_stat, p); 199 vfs_unbusy(mp); 200 inittodr((time_t)0); 201 return (0); 202 } 203 204 /* 205 * This is called early in boot to set the base address and size 206 * of the mini-root. 207 */ 208 int 209 mfs_initminiroot(base) 210 caddr_t base; 211 { 212 struct fs *fs = (struct fs *)(base + SBLOCK_UFS1); 213 214 /* check for valid super block */ 215 if (fs->fs_magic != FS_UFS1_MAGIC || fs->fs_bsize > MAXBSIZE || 216 fs->fs_bsize < sizeof(struct fs)) 217 return (0); 218 mountroot = mfs_mountroot; 219 mfs_rootbase = base; 220 mfs_rootsize = fs->fs_fsize * fs->fs_size; 221 rootdev = makedev(255, mfs_minor); 222 mfs_minor++; 223 return (mfs_rootsize); 224 } 225 226 /* 227 * VFS Operations. 228 * 229 * mount system call 230 */ 231 /* ARGSUSED */ 232 int 233 mfs_mount(mp, path, data, ndp, p) 234 struct mount *mp; 235 const char *path; 236 void *data; 237 struct nameidata *ndp; 238 struct proc *p; 239 { 240 struct vnode *devvp; 241 struct mfs_args args; 242 struct ufsmount *ump; 243 struct fs *fs; 244 struct mfsnode *mfsp; 245 int flags, error; 246 247 if (mp->mnt_flag & MNT_GETARGS) { 248 struct vnode *vp; 249 struct mfsnode *mfsp; 250 251 ump = VFSTOUFS(mp); 252 if (ump == NULL) 253 return EIO; 254 255 vp = ump->um_devvp; 256 if (vp == NULL) 257 return EIO; 258 259 mfsp = VTOMFS(vp); 260 if (mfsp == NULL) 261 return EIO; 262 263 args.fspec = NULL; 264 vfs_showexport(mp, &args.export, &ump->um_export); 265 args.base = mfsp->mfs_baseoff; 266 args.size = mfsp->mfs_size; 267 return copyout(&args, data, sizeof(args)); 268 } 269 /* 270 * XXX turn off async to avoid hangs when writing lots of data. 271 * the problem is that MFS needs to allocate pages to clean pages, 272 * so if we wait until the last minute to clean pages then there 273 * may not be any pages available to do the cleaning. 274 * ... and since the default partially-synchronous mode turns out 275 * to not be sufficient under heavy load, make it full synchronous. 276 */ 277 mp->mnt_flag &= ~MNT_ASYNC; 278 mp->mnt_flag |= MNT_SYNCHRONOUS; 279 280 error = copyin(data, (caddr_t)&args, sizeof (struct mfs_args)); 281 if (error) 282 return (error); 283 284 /* 285 * If updating, check whether changing from read-only to 286 * read/write; if there is no device name, that's all we do. 287 */ 288 if (mp->mnt_flag & MNT_UPDATE) { 289 ump = VFSTOUFS(mp); 290 fs = ump->um_fs; 291 if (fs->fs_ronly == 0 && (mp->mnt_flag & MNT_RDONLY)) { 292 flags = WRITECLOSE; 293 if (mp->mnt_flag & MNT_FORCE) 294 flags |= FORCECLOSE; 295 error = ffs_flushfiles(mp, flags, p); 296 if (error) 297 return (error); 298 } 299 if (fs->fs_ronly && (mp->mnt_flag & MNT_WANTRDWR)) 300 fs->fs_ronly = 0; 301 if (args.fspec == 0) 302 return (vfs_export(mp, &ump->um_export, &args.export)); 303 return (0); 304 } 305 error = getnewvnode(VT_MFS, (struct mount *)0, mfs_vnodeop_p, &devvp); 306 if (error) 307 return (error); 308 devvp->v_type = VBLK; 309 if (checkalias(devvp, makedev(255, mfs_minor), (struct mount *)0)) 310 panic("mfs_mount: dup dev"); 311 mfs_minor++; 312 mfsp = (struct mfsnode *)malloc(sizeof *mfsp, M_MFSNODE, M_WAITOK); 313 devvp->v_data = mfsp; 314 mfsp->mfs_baseoff = args.base; 315 mfsp->mfs_size = args.size; 316 mfsp->mfs_vnode = devvp; 317 mfsp->mfs_proc = p; 318 mfsp->mfs_shutdown = 0; 319 bufq_alloc(&mfsp->mfs_buflist, BUFQ_FCFS); 320 if ((error = ffs_mountfs(devvp, mp, p)) != 0) { 321 mfsp->mfs_shutdown = 1; 322 vrele(devvp); 323 return (error); 324 } 325 ump = VFSTOUFS(mp); 326 fs = ump->um_fs; 327 error = set_statfs_info(path, UIO_USERSPACE, args.fspec, 328 UIO_USERSPACE, mp, p); 329 (void)memcpy(fs->fs_fsmnt, mp->mnt_stat.f_mntonname, 330 sizeof(mp->mnt_stat.f_mntonname)); 331 return error; 332 } 333 334 int mfs_pri = PWAIT | PCATCH; /* XXX prob. temp */ 335 336 /* 337 * Used to grab the process and keep it in the kernel to service 338 * memory filesystem I/O requests. 339 * 340 * Loop servicing I/O requests. 341 * Copy the requested data into or out of the memory filesystem 342 * address space. 343 */ 344 /* ARGSUSED */ 345 int 346 mfs_start(mp, flags, p) 347 struct mount *mp; 348 int flags; 349 struct proc *p; 350 { 351 struct vnode *vp = VFSTOUFS(mp)->um_devvp; 352 struct mfsnode *mfsp = VTOMFS(vp); 353 struct buf *bp; 354 caddr_t base; 355 int sleepreturn = 0; 356 struct lwp *l; /* XXX NJWLWP */ 357 358 /* XXX NJWLWP the vnode interface again gives us a proc in a 359 * place where we want a execution context. Cheat. 360 */ 361 KASSERT(curproc == p); 362 l = curlwp; 363 base = mfsp->mfs_baseoff; 364 while (mfsp->mfs_shutdown != 1) { 365 while ((bp = BUFQ_GET(&mfsp->mfs_buflist)) != NULL) { 366 mfs_doio(bp, base); 367 wakeup((caddr_t)bp); 368 } 369 /* 370 * If a non-ignored signal is received, try to unmount. 371 * If that fails, or the filesystem is already in the 372 * process of being unmounted, clear the signal (it has been 373 * "processed"), otherwise we will loop here, as tsleep 374 * will always return EINTR/ERESTART. 375 */ 376 if (sleepreturn != 0) { 377 /* 378 * XXX Freeze syncer. Must do this before locking 379 * the mount point. See dounmount() for details. 380 */ 381 lockmgr(&syncer_lock, LK_EXCLUSIVE, NULL); 382 if (vfs_busy(mp, LK_NOWAIT, 0) != 0) 383 lockmgr(&syncer_lock, LK_RELEASE, NULL); 384 else if (dounmount(mp, 0, p) != 0) 385 CLRSIG(p, CURSIG(l)); 386 sleepreturn = 0; 387 continue; 388 } 389 390 sleepreturn = tsleep(vp, mfs_pri, "mfsidl", 0); 391 } 392 KASSERT(BUFQ_PEEK(&mfsp->mfs_buflist) == NULL); 393 bufq_free(&mfsp->mfs_buflist); 394 return (sleepreturn); 395 } 396 397 /* 398 * Get file system statistics. 399 */ 400 int 401 mfs_statfs(mp, sbp, p) 402 struct mount *mp; 403 struct statfs *sbp; 404 struct proc *p; 405 { 406 int error; 407 408 error = ffs_statfs(mp, sbp, p); 409 #ifdef COMPAT_09 410 sbp->f_type = 3; 411 #else 412 sbp->f_type = 0; 413 #endif 414 strncpy(&sbp->f_fstypename[0], mp->mnt_op->vfs_name, MFSNAMELEN); 415 return (error); 416 } 417