mfs_vfsops.c revision 1.44
1 /* $NetBSD: mfs_vfsops.c,v 1.44 2003/02/01 06:23:54 thorpej 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 1.44 2003/02/01 06:23:54 thorpej 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 /* 117 * ffs_init() ensures to initialize necessary resources 118 * only once. 119 */ 120 ffs_init(); 121 } 122 123 void 124 mfs_reinit() 125 { 126 ffs_reinit(); 127 } 128 129 void 130 mfs_done() 131 { 132 /* 133 * ffs_done() ensures to free necessary resources 134 * only once, when it's no more needed. 135 */ 136 ffs_done(); 137 } 138 139 /* 140 * Called by main() when mfs is going to be mounted as root. 141 */ 142 143 int 144 mfs_mountroot() 145 { 146 struct fs *fs; 147 struct mount *mp; 148 struct proc *p = curproc; /* XXX */ 149 struct ufsmount *ump; 150 struct mfsnode *mfsp; 151 int error = 0; 152 153 /* 154 * Get vnodes for rootdev. 155 */ 156 if (bdevvp(rootdev, &rootvp)) { 157 printf("mfs_mountroot: can't setup bdevvp's"); 158 return (error); 159 } 160 161 if ((error = vfs_rootmountalloc(MOUNT_MFS, "mfs_root", &mp))) { 162 vrele(rootvp); 163 return (error); 164 } 165 166 mfsp = malloc(sizeof *mfsp, M_MFSNODE, M_WAITOK); 167 rootvp->v_data = mfsp; 168 rootvp->v_op = mfs_vnodeop_p; 169 rootvp->v_tag = VT_MFS; 170 mfsp->mfs_baseoff = mfs_rootbase; 171 mfsp->mfs_size = mfs_rootsize; 172 mfsp->mfs_vnode = rootvp; 173 mfsp->mfs_proc = NULL; /* indicate kernel space */ 174 mfsp->mfs_shutdown = 0; 175 bufq_alloc(&mfsp->mfs_buflist, BUFQ_FCFS); 176 if ((error = ffs_mountfs(rootvp, mp, p)) != 0) { 177 mp->mnt_op->vfs_refcount--; 178 vfs_unbusy(mp); 179 bufq_free(&mfsp->mfs_buflist); 180 free(mp, M_MOUNT); 181 free(mfsp, M_MFSNODE); 182 vrele(rootvp); 183 return (error); 184 } 185 simple_lock(&mountlist_slock); 186 CIRCLEQ_INSERT_TAIL(&mountlist, mp, mnt_list); 187 simple_unlock(&mountlist_slock); 188 mp->mnt_vnodecovered = NULLVP; 189 ump = VFSTOUFS(mp); 190 fs = ump->um_fs; 191 (void) copystr(mp->mnt_stat.f_mntonname, fs->fs_fsmnt, MNAMELEN - 1, 0); 192 (void)ffs_statfs(mp, &mp->mnt_stat, p); 193 vfs_unbusy(mp); 194 inittodr((time_t)0); 195 return (0); 196 } 197 198 /* 199 * This is called early in boot to set the base address and size 200 * of the mini-root. 201 */ 202 int 203 mfs_initminiroot(base) 204 caddr_t base; 205 { 206 struct fs *fs = (struct fs *)(base + SBOFF); 207 208 /* check for valid super block */ 209 if (fs->fs_magic != FS_MAGIC || fs->fs_bsize > MAXBSIZE || 210 fs->fs_bsize < sizeof(struct fs)) 211 return (0); 212 mountroot = mfs_mountroot; 213 mfs_rootbase = base; 214 mfs_rootsize = fs->fs_fsize * fs->fs_size; 215 rootdev = makedev(255, mfs_minor); 216 mfs_minor++; 217 return (mfs_rootsize); 218 } 219 220 /* 221 * VFS Operations. 222 * 223 * mount system call 224 */ 225 /* ARGSUSED */ 226 int 227 mfs_mount(mp, path, data, ndp, p) 228 struct mount *mp; 229 const char *path; 230 void *data; 231 struct nameidata *ndp; 232 struct proc *p; 233 { 234 struct vnode *devvp; 235 struct mfs_args args; 236 struct ufsmount *ump; 237 struct fs *fs; 238 struct mfsnode *mfsp; 239 size_t size; 240 int flags, error; 241 242 if (mp->mnt_flag & MNT_GETARGS) { 243 struct vnode *vp; 244 struct mfsnode *mfsp; 245 246 ump = VFSTOUFS(mp); 247 if (ump == NULL) 248 return EIO; 249 250 vp = ump->um_devvp; 251 if (vp == NULL) 252 return EIO; 253 254 mfsp = VTOMFS(vp); 255 if (mfsp == NULL) 256 return EIO; 257 258 args.fspec = NULL; 259 vfs_showexport(mp, &args.export, &ump->um_export); 260 args.base = mfsp->mfs_baseoff; 261 args.size = mfsp->mfs_size; 262 return copyout(&args, data, sizeof(args)); 263 } 264 /* 265 * XXX turn off async to avoid hangs when writing lots of data. 266 * the problem is that MFS needs to allocate pages to clean pages, 267 * so if we wait until the last minute to clean pages then there 268 * may not be any pages available to do the cleaning. 269 * ... and since the default partially-synchronous mode turns out 270 * to not be sufficient under heavy load, make it full synchronous. 271 */ 272 mp->mnt_flag &= ~MNT_ASYNC; 273 mp->mnt_flag |= MNT_SYNCHRONOUS; 274 275 error = copyin(data, (caddr_t)&args, sizeof (struct mfs_args)); 276 if (error) 277 return (error); 278 279 /* 280 * If updating, check whether changing from read-only to 281 * read/write; if there is no device name, that's all we do. 282 */ 283 if (mp->mnt_flag & MNT_UPDATE) { 284 ump = VFSTOUFS(mp); 285 fs = ump->um_fs; 286 if (fs->fs_ronly == 0 && (mp->mnt_flag & MNT_RDONLY)) { 287 flags = WRITECLOSE; 288 if (mp->mnt_flag & MNT_FORCE) 289 flags |= FORCECLOSE; 290 error = ffs_flushfiles(mp, flags, p); 291 if (error) 292 return (error); 293 } 294 if (fs->fs_ronly && (mp->mnt_flag & MNT_WANTRDWR)) 295 fs->fs_ronly = 0; 296 if (args.fspec == 0) 297 return (vfs_export(mp, &ump->um_export, &args.export)); 298 return (0); 299 } 300 error = getnewvnode(VT_MFS, (struct mount *)0, mfs_vnodeop_p, &devvp); 301 if (error) 302 return (error); 303 devvp->v_type = VBLK; 304 if (checkalias(devvp, makedev(255, mfs_minor), (struct mount *)0)) 305 panic("mfs_mount: dup dev"); 306 mfs_minor++; 307 mfsp = (struct mfsnode *)malloc(sizeof *mfsp, M_MFSNODE, M_WAITOK); 308 devvp->v_data = mfsp; 309 mfsp->mfs_baseoff = args.base; 310 mfsp->mfs_size = args.size; 311 mfsp->mfs_vnode = devvp; 312 mfsp->mfs_proc = p; 313 mfsp->mfs_shutdown = 0; 314 bufq_alloc(&mfsp->mfs_buflist, BUFQ_FCFS); 315 if ((error = ffs_mountfs(devvp, mp, p)) != 0) { 316 mfsp->mfs_shutdown = 1; 317 vrele(devvp); 318 return (error); 319 } 320 ump = VFSTOUFS(mp); 321 fs = ump->um_fs; 322 (void) copyinstr(path, fs->fs_fsmnt, sizeof(fs->fs_fsmnt) - 1, &size); 323 memset(fs->fs_fsmnt + size, 0, sizeof(fs->fs_fsmnt) - size); 324 memcpy(mp->mnt_stat.f_mntonname, fs->fs_fsmnt, MNAMELEN); 325 (void) copyinstr(args.fspec, mp->mnt_stat.f_mntfromname, MNAMELEN - 1, 326 &size); 327 memset(mp->mnt_stat.f_mntfromname + size, 0, MNAMELEN - size); 328 return (0); 329 } 330 331 int mfs_pri = PWAIT | PCATCH; /* XXX prob. temp */ 332 333 /* 334 * Used to grab the process and keep it in the kernel to service 335 * memory filesystem I/O requests. 336 * 337 * Loop servicing I/O requests. 338 * Copy the requested data into or out of the memory filesystem 339 * address space. 340 */ 341 /* ARGSUSED */ 342 int 343 mfs_start(mp, flags, p) 344 struct mount *mp; 345 int flags; 346 struct proc *p; 347 { 348 struct vnode *vp = VFSTOUFS(mp)->um_devvp; 349 struct mfsnode *mfsp = VTOMFS(vp); 350 struct buf *bp; 351 caddr_t base; 352 int sleepreturn = 0; 353 struct lwp *l; /* XXX NJWLWP */ 354 355 /* XXX NJWLWP the vnode interface again gives us a proc in a 356 * place where we want a execution context. Cheat. 357 */ 358 KASSERT(curproc == p); 359 l = curlwp; 360 base = mfsp->mfs_baseoff; 361 while (mfsp->mfs_shutdown != 1) { 362 while ((bp = BUFQ_GET(&mfsp->mfs_buflist)) != NULL) { 363 mfs_doio(bp, base); 364 wakeup((caddr_t)bp); 365 } 366 /* 367 * If a non-ignored signal is received, try to unmount. 368 * If that fails, or the filesystem is already in the 369 * process of being unmounted, clear the signal (it has been 370 * "processed"), otherwise we will loop here, as tsleep 371 * will always return EINTR/ERESTART. 372 */ 373 if (sleepreturn != 0) { 374 /* 375 * XXX Freeze syncer. Must do this before locking 376 * the mount point. See dounmount() for details. 377 */ 378 lockmgr(&syncer_lock, LK_EXCLUSIVE, NULL); 379 if (vfs_busy(mp, LK_NOWAIT, 0) != 0) 380 lockmgr(&syncer_lock, LK_RELEASE, NULL); 381 else if (dounmount(mp, 0, p) != 0) 382 CLRSIG(p, CURSIG(l)); 383 sleepreturn = 0; 384 continue; 385 } 386 387 sleepreturn = tsleep(vp, mfs_pri, "mfsidl", 0); 388 } 389 KASSERT(BUFQ_PEEK(&mfsp->mfs_buflist) == NULL); 390 bufq_free(&mfsp->mfs_buflist); 391 return (sleepreturn); 392 } 393 394 /* 395 * Get file system statistics. 396 */ 397 int 398 mfs_statfs(mp, sbp, p) 399 struct mount *mp; 400 struct statfs *sbp; 401 struct proc *p; 402 { 403 int error; 404 405 error = ffs_statfs(mp, sbp, p); 406 #ifdef COMPAT_09 407 sbp->f_type = 3; 408 #else 409 sbp->f_type = 0; 410 #endif 411 strncpy(&sbp->f_fstypename[0], mp->mnt_op->vfs_name, MFSNAMELEN); 412 return (error); 413 } 414
Indexes created Sun Sep 28 07:09:56 GMT 2025