1 /* $NetBSD: mfs_vfsops.c,v 1.36 2001/11/08 02:39:14 lukem 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 1.36 2001/11/08 02:39:14 lukem 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 /* 77 * mfs vfs operations. 78 */ 79 80 extern const struct vnodeopv_desc mfs_vnodeop_opv_desc; 81 82 const struct vnodeopv_desc * const mfs_vnodeopv_descs[] = { 83 &mfs_vnodeop_opv_desc, 84 NULL, 85 }; 86 87 struct 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 */ 111 void 112 mfs_init() 113 { 114 /* 115 * ffs_init() ensures to initialize necessary resources 116 * only once. 117 */ 118 ffs_init(); 119 } 120 121 void 122 mfs_reinit() 123 { 124 ffs_reinit(); 125 } 126 127 void 128 mfs_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 */ 140 141 int 142 mfs_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 */ 198 int 199 mfs_initminiroot(base) 200 caddr_t base; 201 { 202 struct fs *fs = (struct fs *)(base + SBOFF); 203 extern int (*mountroot) __P((void)); 204 205 /* check for valid super block */ 206 if (fs->fs_magic != FS_MAGIC || fs->fs_bsize > MAXBSIZE || 207 fs->fs_bsize < sizeof(struct fs)) 208 return (0); 209 mountroot = mfs_mountroot; 210 mfs_rootbase = base; 211 mfs_rootsize = fs->fs_fsize * fs->fs_size; 212 rootdev = makedev(255, mfs_minor); 213 mfs_minor++; 214 return (mfs_rootsize); 215 } 216 217 /* 218 * VFS Operations. 219 * 220 * mount system call 221 */ 222 /* ARGSUSED */ 223 int 224 mfs_mount(mp, path, data, ndp, p) 225 struct mount *mp; 226 const char *path; 227 void *data; 228 struct nameidata *ndp; 229 struct proc *p; 230 { 231 struct vnode *devvp; 232 struct mfs_args args; 233 struct ufsmount *ump; 234 struct fs *fs; 235 struct mfsnode *mfsp; 236 size_t size; 237 int flags, error; 238 239 error = copyin(data, (caddr_t)&args, sizeof (struct mfs_args)); 240 if (error) 241 return (error); 242 243 /* 244 * If updating, check whether changing from read-only to 245 * read/write; if there is no device name, that's all we do. 246 */ 247 if (mp->mnt_flag & MNT_UPDATE) { 248 ump = VFSTOUFS(mp); 249 fs = ump->um_fs; 250 if (fs->fs_ronly == 0 && (mp->mnt_flag & MNT_RDONLY)) { 251 flags = WRITECLOSE; 252 if (mp->mnt_flag & MNT_FORCE) 253 flags |= FORCECLOSE; 254 error = ffs_flushfiles(mp, flags, p); 255 if (error) 256 return (error); 257 } 258 if (fs->fs_ronly && (mp->mnt_flag & MNT_WANTRDWR)) 259 fs->fs_ronly = 0; 260 if (args.fspec == 0) 261 return (vfs_export(mp, &ump->um_export, &args.export)); 262 return (0); 263 } 264 error = getnewvnode(VT_MFS, (struct mount *)0, mfs_vnodeop_p, &devvp); 265 if (error) 266 return (error); 267 devvp->v_type = VBLK; 268 if (checkalias(devvp, makedev(255, mfs_minor), (struct mount *)0)) 269 panic("mfs_mount: dup dev"); 270 mfs_minor++; 271 mfsp = (struct mfsnode *)malloc(sizeof *mfsp, M_MFSNODE, M_WAITOK); 272 devvp->v_data = mfsp; 273 mfsp->mfs_baseoff = args.base; 274 mfsp->mfs_size = args.size; 275 mfsp->mfs_vnode = devvp; 276 mfsp->mfs_proc = p; 277 BUFQ_INIT(&mfsp->mfs_buflist); 278 if ((error = ffs_mountfs(devvp, mp, p)) != 0) { 279 BUFQ_FIRST(&mfsp->mfs_buflist) = (struct buf *) -1; 280 vrele(devvp); 281 return (error); 282 } 283 ump = VFSTOUFS(mp); 284 fs = ump->um_fs; 285 (void) copyinstr(path, fs->fs_fsmnt, sizeof(fs->fs_fsmnt) - 1, &size); 286 memset(fs->fs_fsmnt + size, 0, sizeof(fs->fs_fsmnt) - size); 287 memcpy(mp->mnt_stat.f_mntonname, fs->fs_fsmnt, MNAMELEN); 288 (void) copyinstr(args.fspec, mp->mnt_stat.f_mntfromname, MNAMELEN - 1, 289 &size); 290 memset(mp->mnt_stat.f_mntfromname + size, 0, MNAMELEN - size); 291 return (0); 292 } 293 294 int mfs_pri = PWAIT | PCATCH; /* XXX prob. temp */ 295 296 /* 297 * Used to grab the process and keep it in the kernel to service 298 * memory filesystem I/O requests. 299 * 300 * Loop servicing I/O requests. 301 * Copy the requested data into or out of the memory filesystem 302 * address space. 303 */ 304 /* ARGSUSED */ 305 int 306 mfs_start(mp, flags, p) 307 struct mount *mp; 308 int flags; 309 struct proc *p; 310 { 311 struct vnode *vp = VFSTOUFS(mp)->um_devvp; 312 struct mfsnode *mfsp = VTOMFS(vp); 313 struct buf *bp; 314 caddr_t base; 315 int sleepreturn = 0; 316 317 base = mfsp->mfs_baseoff; 318 while (BUFQ_FIRST(&mfsp->mfs_buflist) != (struct buf *) -1) { 319 while ((bp = BUFQ_FIRST(&mfsp->mfs_buflist)) != NULL) { 320 BUFQ_REMOVE(&mfsp->mfs_buflist, bp); 321 mfs_doio(bp, base); 322 wakeup((caddr_t)bp); 323 } 324 /* 325 * If a non-ignored signal is received, try to unmount. 326 * If that fails, or the filesystem is already in the 327 * process of being unmounted, clear the signal (it has been 328 * "processed"), otherwise we will loop here, as tsleep 329 * will always return EINTR/ERESTART. 330 */ 331 if (sleepreturn != 0) { 332 /* 333 * XXX Freeze syncer. Must do this before locking 334 * the mount point. See dounmount() for details. 335 */ 336 lockmgr(&syncer_lock, LK_EXCLUSIVE, NULL); 337 if (vfs_busy(mp, LK_NOWAIT, 0) != 0) 338 lockmgr(&syncer_lock, LK_RELEASE, NULL); 339 else if (dounmount(mp, 0, p) != 0) 340 CLRSIG(p, CURSIG(p)); 341 sleepreturn = 0; 342 continue; 343 } 344 345 sleepreturn = tsleep(vp, mfs_pri, "mfsidl", 0); 346 } 347 return (sleepreturn); 348 } 349 350 /* 351 * Get file system statistics. 352 */ 353 int 354 mfs_statfs(mp, sbp, p) 355 struct mount *mp; 356 struct statfs *sbp; 357 struct proc *p; 358 { 359 int error; 360 361 error = ffs_statfs(mp, sbp, p); 362 #ifdef COMPAT_09 363 sbp->f_type = 3; 364 #else 365 sbp->f_type = 0; 366 #endif 367 strncpy(&sbp->f_fstypename[0], mp->mnt_op->vfs_name, MFSNAMELEN); 368 return (error); 369 } 370