mfs_vfsops.c revision 1.35
1 /* $NetBSD: mfs_vfsops.c,v 1.35 2001/09/15 16:13:06 chs 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_OPT) 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_reinit, 98 mfs_done, 99 ffs_sysctl, 100 NULL, 101 ufs_check_export, 102 mfs_vnodeopv_descs, 103 }; 104 105 /* 106 * Memory based filesystem initialization. 107 */ 108 void 109 mfs_init() 110 { 111 /* 112 * ffs_init() ensures to initialize necessary resources 113 * only once. 114 */ 115 ffs_init(); 116 } 117 118 void 119 mfs_reinit() 120 { 121 ffs_reinit(); 122 } 123 124 void 125 mfs_done() 126 { 127 /* 128 * ffs_done() ensures to free necessary resources 129 * only once, when it's no more needed. 130 */ 131 ffs_done(); 132 } 133 134 /* 135 * Called by main() when mfs is going to be mounted as root. 136 */ 137 138 int 139 mfs_mountroot() 140 { 141 struct fs *fs; 142 struct mount *mp; 143 struct proc *p = curproc; /* XXX */ 144 struct ufsmount *ump; 145 struct mfsnode *mfsp; 146 int error = 0; 147 148 /* 149 * Get vnodes for rootdev. 150 */ 151 if (bdevvp(rootdev, &rootvp)) { 152 printf("mfs_mountroot: can't setup bdevvp's"); 153 return (error); 154 } 155 156 if ((error = vfs_rootmountalloc(MOUNT_MFS, "mfs_root", &mp))) { 157 vrele(rootvp); 158 return (error); 159 } 160 161 mfsp = malloc(sizeof *mfsp, M_MFSNODE, M_WAITOK); 162 rootvp->v_data = mfsp; 163 rootvp->v_op = mfs_vnodeop_p; 164 rootvp->v_tag = VT_MFS; 165 mfsp->mfs_baseoff = mfs_rootbase; 166 mfsp->mfs_size = mfs_rootsize; 167 mfsp->mfs_vnode = rootvp; 168 mfsp->mfs_proc = NULL; /* indicate kernel space */ 169 BUFQ_INIT(&mfsp->mfs_buflist); 170 if ((error = ffs_mountfs(rootvp, mp, p)) != 0) { 171 mp->mnt_op->vfs_refcount--; 172 vfs_unbusy(mp); 173 free(mp, M_MOUNT); 174 free(mfsp, M_MFSNODE); 175 vrele(rootvp); 176 return (error); 177 } 178 simple_lock(&mountlist_slock); 179 CIRCLEQ_INSERT_TAIL(&mountlist, mp, mnt_list); 180 simple_unlock(&mountlist_slock); 181 mp->mnt_vnodecovered = NULLVP; 182 ump = VFSTOUFS(mp); 183 fs = ump->um_fs; 184 (void) copystr(mp->mnt_stat.f_mntonname, fs->fs_fsmnt, MNAMELEN - 1, 0); 185 (void)ffs_statfs(mp, &mp->mnt_stat, p); 186 vfs_unbusy(mp); 187 inittodr((time_t)0); 188 return (0); 189 } 190 191 /* 192 * This is called early in boot to set the base address and size 193 * of the mini-root. 194 */ 195 int 196 mfs_initminiroot(base) 197 caddr_t base; 198 { 199 struct fs *fs = (struct fs *)(base + SBOFF); 200 extern int (*mountroot) __P((void)); 201 202 /* check for valid super block */ 203 if (fs->fs_magic != FS_MAGIC || fs->fs_bsize > MAXBSIZE || 204 fs->fs_bsize < sizeof(struct fs)) 205 return (0); 206 mountroot = mfs_mountroot; 207 mfs_rootbase = base; 208 mfs_rootsize = fs->fs_fsize * fs->fs_size; 209 rootdev = makedev(255, mfs_minor); 210 mfs_minor++; 211 return (mfs_rootsize); 212 } 213 214 /* 215 * VFS Operations. 216 * 217 * mount system call 218 */ 219 /* ARGSUSED */ 220 int 221 mfs_mount(mp, path, data, ndp, p) 222 struct mount *mp; 223 const char *path; 224 void *data; 225 struct nameidata *ndp; 226 struct proc *p; 227 { 228 struct vnode *devvp; 229 struct mfs_args args; 230 struct ufsmount *ump; 231 struct fs *fs; 232 struct mfsnode *mfsp; 233 size_t size; 234 int flags, error; 235 236 error = copyin(data, (caddr_t)&args, sizeof (struct mfs_args)); 237 if (error) 238 return (error); 239 240 /* 241 * If updating, check whether changing from read-only to 242 * read/write; if there is no device name, that's all we do. 243 */ 244 if (mp->mnt_flag & MNT_UPDATE) { 245 ump = VFSTOUFS(mp); 246 fs = ump->um_fs; 247 if (fs->fs_ronly == 0 && (mp->mnt_flag & MNT_RDONLY)) { 248 flags = WRITECLOSE; 249 if (mp->mnt_flag & MNT_FORCE) 250 flags |= FORCECLOSE; 251 error = ffs_flushfiles(mp, flags, p); 252 if (error) 253 return (error); 254 } 255 if (fs->fs_ronly && (mp->mnt_flag & MNT_WANTRDWR)) 256 fs->fs_ronly = 0; 257 if (args.fspec == 0) 258 return (vfs_export(mp, &ump->um_export, &args.export)); 259 return (0); 260 } 261 error = getnewvnode(VT_MFS, (struct mount *)0, mfs_vnodeop_p, &devvp); 262 if (error) 263 return (error); 264 devvp->v_type = VBLK; 265 if (checkalias(devvp, makedev(255, mfs_minor), (struct mount *)0)) 266 panic("mfs_mount: dup dev"); 267 mfs_minor++; 268 mfsp = (struct mfsnode *)malloc(sizeof *mfsp, M_MFSNODE, M_WAITOK); 269 devvp->v_data = mfsp; 270 mfsp->mfs_baseoff = args.base; 271 mfsp->mfs_size = args.size; 272 mfsp->mfs_vnode = devvp; 273 mfsp->mfs_proc = p; 274 BUFQ_INIT(&mfsp->mfs_buflist); 275 if ((error = ffs_mountfs(devvp, mp, p)) != 0) { 276 BUFQ_FIRST(&mfsp->mfs_buflist) = (struct buf *) -1; 277 vrele(devvp); 278 return (error); 279 } 280 ump = VFSTOUFS(mp); 281 fs = ump->um_fs; 282 (void) copyinstr(path, fs->fs_fsmnt, sizeof(fs->fs_fsmnt) - 1, &size); 283 memset(fs->fs_fsmnt + size, 0, sizeof(fs->fs_fsmnt) - size); 284 memcpy(mp->mnt_stat.f_mntonname, fs->fs_fsmnt, MNAMELEN); 285 (void) copyinstr(args.fspec, mp->mnt_stat.f_mntfromname, MNAMELEN - 1, 286 &size); 287 memset(mp->mnt_stat.f_mntfromname + size, 0, MNAMELEN - size); 288 return (0); 289 } 290 291 int mfs_pri = PWAIT | PCATCH; /* XXX prob. temp */ 292 293 /* 294 * Used to grab the process and keep it in the kernel to service 295 * memory filesystem I/O requests. 296 * 297 * Loop servicing I/O requests. 298 * Copy the requested data into or out of the memory filesystem 299 * address space. 300 */ 301 /* ARGSUSED */ 302 int 303 mfs_start(mp, flags, p) 304 struct mount *mp; 305 int flags; 306 struct proc *p; 307 { 308 struct vnode *vp = VFSTOUFS(mp)->um_devvp; 309 struct mfsnode *mfsp = VTOMFS(vp); 310 struct buf *bp; 311 caddr_t base; 312 int sleepreturn = 0; 313 314 base = mfsp->mfs_baseoff; 315 while (BUFQ_FIRST(&mfsp->mfs_buflist) != (struct buf *) -1) { 316 while ((bp = BUFQ_FIRST(&mfsp->mfs_buflist)) != NULL) { 317 BUFQ_REMOVE(&mfsp->mfs_buflist, bp); 318 mfs_doio(bp, base); 319 wakeup((caddr_t)bp); 320 } 321 /* 322 * If a non-ignored signal is received, try to unmount. 323 * If that fails, or the filesystem is already in the 324 * process of being unmounted, clear the signal (it has been 325 * "processed"), otherwise we will loop here, as tsleep 326 * will always return EINTR/ERESTART. 327 */ 328 if (sleepreturn != 0) { 329 /* 330 * XXX Freeze syncer. Must do this before locking 331 * the mount point. See dounmount() for details. 332 */ 333 lockmgr(&syncer_lock, LK_EXCLUSIVE, NULL); 334 if (vfs_busy(mp, LK_NOWAIT, 0) != 0) 335 lockmgr(&syncer_lock, LK_RELEASE, NULL); 336 else if (dounmount(mp, 0, p) != 0) 337 CLRSIG(p, CURSIG(p)); 338 sleepreturn = 0; 339 continue; 340 } 341 342 sleepreturn = tsleep(vp, mfs_pri, "mfsidl", 0); 343 } 344 return (sleepreturn); 345 } 346 347 /* 348 * Get file system statistics. 349 */ 350 int 351 mfs_statfs(mp, sbp, p) 352 struct mount *mp; 353 struct statfs *sbp; 354 struct proc *p; 355 { 356 int error; 357 358 error = ffs_statfs(mp, sbp, p); 359 #ifdef COMPAT_09 360 sbp->f_type = 3; 361 #else 362 sbp->f_type = 0; 363 #endif 364 strncpy(&sbp->f_fstypename[0], mp->mnt_op->vfs_name, MFSNAMELEN); 365 return (error); 366 } 367
Indexes created Sat Sep 27 22:09:54 GMT 2025