mfs_vfsops.c revision 1.33
1 /* $NetBSD: mfs_vfsops.c,v 1.33 2001/04/16 22:41:12 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 #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 <miscfs/syncfs/syncfs.h> 54 55 #include <ufs/ufs/quota.h> 56 #include <ufs/ufs/inode.h> 57 #include <ufs/ufs/ufsmount.h> 58 #include <ufs/ufs/ufs_extern.h> 59 60 #include <ufs/ffs/fs.h> 61 #include <ufs/ffs/ffs_extern.h> 62 63 #include <ufs/mfs/mfsnode.h> 64 #include <ufs/mfs/mfs_extern.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 const struct vnodeopv_desc mfs_vnodeop_opv_desc; 78 79 const struct vnodeopv_desc * const 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 mfs_done, 98 ffs_sysctl, 99 NULL, 100 ufs_check_export, 101 mfs_vnodeopv_descs, 102 }; 103 104 /* 105 * Memory based filesystem initialization. 106 */ 107 void 108 mfs_init() 109 { 110 /* 111 * ffs_init() ensures to initialize necessary resources 112 * only once. 113 */ 114 ffs_init(); 115 } 116 117 void 118 mfs_done() 119 { 120 /* 121 * ffs_done() ensures to free necessary resources 122 * only once, when it's no more needed. 123 */ 124 ffs_done(); 125 } 126 127 /* 128 * Called by main() when mfs is going to be mounted as root. 129 */ 130 131 int 132 mfs_mountroot() 133 { 134 struct fs *fs; 135 struct mount *mp; 136 struct proc *p = curproc; /* XXX */ 137 struct ufsmount *ump; 138 struct mfsnode *mfsp; 139 int error = 0; 140 141 /* 142 * Get vnodes for rootdev. 143 */ 144 if (bdevvp(rootdev, &rootvp)) { 145 printf("mfs_mountroot: can't setup bdevvp's"); 146 return (error); 147 } 148 149 if ((error = vfs_rootmountalloc(MOUNT_MFS, "mfs_root", &mp))) { 150 vrele(rootvp); 151 return (error); 152 } 153 154 mfsp = malloc(sizeof *mfsp, M_MFSNODE, M_WAITOK); 155 rootvp->v_data = mfsp; 156 rootvp->v_op = mfs_vnodeop_p; 157 rootvp->v_tag = VT_MFS; 158 mfsp->mfs_baseoff = mfs_rootbase; 159 mfsp->mfs_size = mfs_rootsize; 160 mfsp->mfs_vnode = rootvp; 161 mfsp->mfs_proc = NULL; /* indicate kernel space */ 162 BUFQ_INIT(&mfsp->mfs_buflist); 163 if ((error = ffs_mountfs(rootvp, mp, p)) != 0) { 164 mp->mnt_op->vfs_refcount--; 165 vfs_unbusy(mp); 166 free(mp, M_MOUNT); 167 free(mfsp, M_MFSNODE); 168 vrele(rootvp); 169 return (error); 170 } 171 simple_lock(&mountlist_slock); 172 CIRCLEQ_INSERT_TAIL(&mountlist, mp, mnt_list); 173 simple_unlock(&mountlist_slock); 174 mp->mnt_vnodecovered = NULLVP; 175 ump = VFSTOUFS(mp); 176 fs = ump->um_fs; 177 (void) copystr(mp->mnt_stat.f_mntonname, fs->fs_fsmnt, MNAMELEN - 1, 0); 178 (void)ffs_statfs(mp, &mp->mnt_stat, p); 179 vfs_unbusy(mp); 180 inittodr((time_t)0); 181 return (0); 182 } 183 184 /* 185 * This is called early in boot to set the base address and size 186 * of the mini-root. 187 */ 188 int 189 mfs_initminiroot(base) 190 caddr_t base; 191 { 192 struct fs *fs = (struct fs *)(base + SBOFF); 193 extern int (*mountroot) __P((void)); 194 195 /* check for valid super block */ 196 if (fs->fs_magic != FS_MAGIC || fs->fs_bsize > MAXBSIZE || 197 fs->fs_bsize < sizeof(struct fs)) 198 return (0); 199 mountroot = mfs_mountroot; 200 mfs_rootbase = base; 201 mfs_rootsize = fs->fs_fsize * fs->fs_size; 202 rootdev = makedev(255, mfs_minor); 203 mfs_minor++; 204 return (mfs_rootsize); 205 } 206 207 /* 208 * VFS Operations. 209 * 210 * mount system call 211 */ 212 /* ARGSUSED */ 213 int 214 mfs_mount(mp, path, data, ndp, p) 215 struct mount *mp; 216 const char *path; 217 void *data; 218 struct nameidata *ndp; 219 struct proc *p; 220 { 221 struct vnode *devvp; 222 struct mfs_args args; 223 struct ufsmount *ump; 224 struct fs *fs; 225 struct mfsnode *mfsp; 226 size_t size; 227 int flags, error; 228 229 error = copyin(data, (caddr_t)&args, sizeof (struct mfs_args)); 230 if (error) 231 return (error); 232 233 /* 234 * If updating, check whether changing from read-only to 235 * read/write; if there is no device name, that's all we do. 236 */ 237 if (mp->mnt_flag & MNT_UPDATE) { 238 ump = VFSTOUFS(mp); 239 fs = ump->um_fs; 240 if (fs->fs_ronly == 0 && (mp->mnt_flag & MNT_RDONLY)) { 241 flags = WRITECLOSE; 242 if (mp->mnt_flag & MNT_FORCE) 243 flags |= FORCECLOSE; 244 error = ffs_flushfiles(mp, flags, p); 245 if (error) 246 return (error); 247 } 248 if (fs->fs_ronly && (mp->mnt_flag & MNT_WANTRDWR)) 249 fs->fs_ronly = 0; 250 if (args.fspec == 0) 251 return (vfs_export(mp, &ump->um_export, &args.export)); 252 return (0); 253 } 254 error = getnewvnode(VT_MFS, (struct mount *)0, mfs_vnodeop_p, &devvp); 255 if (error) 256 return (error); 257 devvp->v_type = VBLK; 258 if (checkalias(devvp, makedev(255, mfs_minor), (struct mount *)0)) 259 panic("mfs_mount: dup dev"); 260 mfs_minor++; 261 mfsp = (struct mfsnode *)malloc(sizeof *mfsp, M_MFSNODE, M_WAITOK); 262 devvp->v_data = mfsp; 263 mfsp->mfs_baseoff = args.base; 264 mfsp->mfs_size = args.size; 265 mfsp->mfs_vnode = devvp; 266 mfsp->mfs_proc = p; 267 BUFQ_INIT(&mfsp->mfs_buflist); 268 if ((error = ffs_mountfs(devvp, mp, p)) != 0) { 269 BUFQ_FIRST(&mfsp->mfs_buflist) = (struct buf *) -1; 270 vrele(devvp); 271 return (error); 272 } 273 ump = VFSTOUFS(mp); 274 fs = ump->um_fs; 275 (void) copyinstr(path, fs->fs_fsmnt, sizeof(fs->fs_fsmnt) - 1, &size); 276 memset(fs->fs_fsmnt + size, 0, sizeof(fs->fs_fsmnt) - size); 277 memcpy(mp->mnt_stat.f_mntonname, fs->fs_fsmnt, MNAMELEN); 278 (void) copyinstr(args.fspec, mp->mnt_stat.f_mntfromname, MNAMELEN - 1, 279 &size); 280 memset(mp->mnt_stat.f_mntfromname + size, 0, MNAMELEN - size); 281 return (0); 282 } 283 284 int mfs_pri = PWAIT | PCATCH; /* XXX prob. temp */ 285 286 /* 287 * Used to grab the process and keep it in the kernel to service 288 * memory filesystem I/O requests. 289 * 290 * Loop servicing I/O requests. 291 * Copy the requested data into or out of the memory filesystem 292 * address space. 293 */ 294 /* ARGSUSED */ 295 int 296 mfs_start(mp, flags, p) 297 struct mount *mp; 298 int flags; 299 struct proc *p; 300 { 301 struct vnode *vp = VFSTOUFS(mp)->um_devvp; 302 struct mfsnode *mfsp = VTOMFS(vp); 303 struct buf *bp; 304 caddr_t base; 305 int sleepreturn = 0; 306 307 base = mfsp->mfs_baseoff; 308 while (BUFQ_FIRST(&mfsp->mfs_buflist) != (struct buf *) -1) { 309 while ((bp = BUFQ_FIRST(&mfsp->mfs_buflist)) != NULL) { 310 BUFQ_REMOVE(&mfsp->mfs_buflist, bp); 311 mfs_doio(bp, base); 312 wakeup((caddr_t)bp); 313 } 314 /* 315 * If a non-ignored signal is received, try to unmount. 316 * If that fails, or the filesystem is already in the 317 * process of being unmounted, clear the signal (it has been 318 * "processed"), otherwise we will loop here, as tsleep 319 * will always return EINTR/ERESTART. 320 */ 321 if (sleepreturn != 0) { 322 /* 323 * XXX Freeze syncer. Must do this before locking 324 * the mount point. See dounmount() for details. 325 */ 326 lockmgr(&syncer_lock, LK_EXCLUSIVE, NULL); 327 if (vfs_busy(mp, LK_NOWAIT, 0) != 0) 328 lockmgr(&syncer_lock, LK_RELEASE, NULL); 329 else if (dounmount(mp, 0, p) != 0) 330 CLRSIG(p, CURSIG(p)); 331 sleepreturn = 0; 332 continue; 333 } 334 335 sleepreturn = tsleep(vp, mfs_pri, "mfsidl", 0); 336 } 337 return (sleepreturn); 338 } 339 340 /* 341 * Get file system statistics. 342 */ 343 int 344 mfs_statfs(mp, sbp, p) 345 struct mount *mp; 346 struct statfs *sbp; 347 struct proc *p; 348 { 349 int error; 350 351 error = ffs_statfs(mp, sbp, p); 352 #ifdef COMPAT_09 353 sbp->f_type = 3; 354 #else 355 sbp->f_type = 0; 356 #endif 357 strncpy(&sbp->f_fstypename[0], mp->mnt_op->vfs_name, MFSNAMELEN); 358 return (error); 359 } 360
Indexes created Mon Sep 29 21:09:56 GMT 2025