mfs_vfsops.c revision 1.26
1 /* $NetBSD: mfs_vfsops.c,v 1.26 2000/05/16 00:24:08 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 <ufs/ufs/quota.h> 54 #include <ufs/ufs/inode.h> 55 #include <ufs/ufs/ufsmount.h> 56 #include <ufs/ufs/ufs_extern.h> 57 58 #include <ufs/ffs/fs.h> 59 #include <ufs/ffs/ffs_extern.h> 60 61 #include <ufs/mfs/mfsnode.h> 62 #include <ufs/mfs/mfs_extern.h> 63 64 caddr_t mfs_rootbase; /* address of mini-root in kernel virtual memory */ 65 u_long mfs_rootsize; /* size of mini-root in bytes */ 66 67 static int mfs_minor; /* used for building internal dev_t */ 68 69 extern int (**mfs_vnodeop_p) __P((void *)); 70 71 /* 72 * mfs vfs operations. 73 */ 74 75 extern struct vnodeopv_desc mfs_vnodeop_opv_desc; 76 77 struct vnodeopv_desc *mfs_vnodeopv_descs[] = { 78 &mfs_vnodeop_opv_desc, 79 NULL, 80 }; 81 82 struct vfsops mfs_vfsops = { 83 MOUNT_MFS, 84 mfs_mount, 85 mfs_start, 86 ffs_unmount, 87 ufs_root, 88 ufs_quotactl, 89 mfs_statfs, 90 ffs_sync, 91 ffs_vget, 92 ffs_fhtovp, 93 ffs_vptofh, 94 mfs_init, 95 mfs_done, 96 ffs_sysctl, 97 NULL, 98 ufs_check_export, 99 mfs_vnodeopv_descs, 100 }; 101 102 /* 103 * Memory based filesystem initialization. 104 */ 105 void 106 mfs_init() 107 { 108 /* 109 * ffs_init() ensures to initialize necessary resources 110 * only once. 111 */ 112 ffs_init(); 113 } 114 115 void 116 mfs_done() 117 { 118 /* 119 * ffs_done() ensures to free necessary resources 120 * only once, when it's no more needed. 121 */ 122 ffs_done(); 123 } 124 125 /* 126 * Called by main() when mfs is going to be mounted as root. 127 */ 128 129 int 130 mfs_mountroot() 131 { 132 struct fs *fs; 133 struct mount *mp; 134 struct proc *p = curproc; /* XXX */ 135 struct ufsmount *ump; 136 struct mfsnode *mfsp; 137 int error = 0; 138 139 /* 140 * Get vnodes for rootdev. 141 */ 142 if (bdevvp(rootdev, &rootvp)) { 143 printf("mfs_mountroot: can't setup bdevvp's"); 144 return (error); 145 } 146 147 if ((error = vfs_rootmountalloc(MOUNT_MFS, "mfs_root", &mp))) { 148 vrele(rootvp); 149 return (error); 150 } 151 152 mfsp = malloc(sizeof *mfsp, M_MFSNODE, M_WAITOK); 153 rootvp->v_data = mfsp; 154 rootvp->v_op = mfs_vnodeop_p; 155 rootvp->v_tag = VT_MFS; 156 mfsp->mfs_baseoff = mfs_rootbase; 157 mfsp->mfs_size = mfs_rootsize; 158 mfsp->mfs_vnode = rootvp; 159 mfsp->mfs_proc = NULL; /* indicate kernel space */ 160 BUFQ_INIT(&mfsp->mfs_buflist); 161 if ((error = ffs_mountfs(rootvp, mp, p)) != 0) { 162 mp->mnt_op->vfs_refcount--; 163 vfs_unbusy(mp); 164 free(mp, M_MOUNT); 165 free(mfsp, M_MFSNODE); 166 vrele(rootvp); 167 return (error); 168 } 169 simple_lock(&mountlist_slock); 170 CIRCLEQ_INSERT_TAIL(&mountlist, mp, mnt_list); 171 simple_unlock(&mountlist_slock); 172 mp->mnt_vnodecovered = NULLVP; 173 ump = VFSTOUFS(mp); 174 fs = ump->um_fs; 175 (void) copystr(mp->mnt_stat.f_mntonname, fs->fs_fsmnt, MNAMELEN - 1, 0); 176 (void)ffs_statfs(mp, &mp->mnt_stat, p); 177 vfs_unbusy(mp); 178 inittodr((time_t)0); 179 return (0); 180 } 181 182 /* 183 * This is called early in boot to set the base address and size 184 * of the mini-root. 185 */ 186 int 187 mfs_initminiroot(base) 188 caddr_t base; 189 { 190 struct fs *fs = (struct fs *)(base + SBOFF); 191 extern int (*mountroot) __P((void)); 192 193 /* check for valid super block */ 194 if (fs->fs_magic != FS_MAGIC || fs->fs_bsize > MAXBSIZE || 195 fs->fs_bsize < sizeof(struct fs)) 196 return (0); 197 mountroot = mfs_mountroot; 198 mfs_rootbase = base; 199 mfs_rootsize = fs->fs_fsize * fs->fs_size; 200 rootdev = makedev(255, mfs_minor++); 201 return (mfs_rootsize); 202 } 203 204 /* 205 * VFS Operations. 206 * 207 * mount system call 208 */ 209 /* ARGSUSED */ 210 int 211 mfs_mount(mp, path, data, ndp, p) 212 struct mount *mp; 213 const char *path; 214 void *data; 215 struct nameidata *ndp; 216 struct proc *p; 217 { 218 struct vnode *devvp; 219 struct mfs_args args; 220 struct ufsmount *ump; 221 struct fs *fs; 222 struct mfsnode *mfsp; 223 size_t size; 224 int flags, error; 225 226 error = copyin(data, (caddr_t)&args, sizeof (struct mfs_args)); 227 if (error) 228 return (error); 229 230 /* 231 * If updating, check whether changing from read-only to 232 * read/write; if there is no device name, that's all we do. 233 */ 234 if (mp->mnt_flag & MNT_UPDATE) { 235 ump = VFSTOUFS(mp); 236 fs = ump->um_fs; 237 if (fs->fs_ronly == 0 && (mp->mnt_flag & MNT_RDONLY)) { 238 flags = WRITECLOSE; 239 if (mp->mnt_flag & MNT_FORCE) 240 flags |= FORCECLOSE; 241 error = ffs_flushfiles(mp, flags, p); 242 if (error) 243 return (error); 244 } 245 if (fs->fs_ronly && (mp->mnt_flag & MNT_WANTRDWR)) 246 fs->fs_ronly = 0; 247 if (args.fspec == 0) 248 return (vfs_export(mp, &ump->um_export, &args.export)); 249 return (0); 250 } 251 error = getnewvnode(VT_MFS, (struct mount *)0, mfs_vnodeop_p, &devvp); 252 if (error) 253 return (error); 254 devvp->v_type = VBLK; 255 if (checkalias(devvp, makedev(255, mfs_minor++), (struct mount *)0)) 256 panic("mfs_mount: dup dev"); 257 mfsp = (struct mfsnode *)malloc(sizeof *mfsp, M_MFSNODE, M_WAITOK); 258 devvp->v_data = mfsp; 259 mfsp->mfs_baseoff = args.base; 260 mfsp->mfs_size = args.size; 261 mfsp->mfs_vnode = devvp; 262 mfsp->mfs_proc = p; 263 BUFQ_INIT(&mfsp->mfs_buflist); 264 if ((error = ffs_mountfs(devvp, mp, p)) != 0) { 265 BUFQ_FIRST(&mfsp->mfs_buflist) = (struct buf *) -1; 266 vrele(devvp); 267 return (error); 268 } 269 ump = VFSTOUFS(mp); 270 fs = ump->um_fs; 271 (void) copyinstr(path, fs->fs_fsmnt, sizeof(fs->fs_fsmnt) - 1, &size); 272 memset(fs->fs_fsmnt + size, 0, sizeof(fs->fs_fsmnt) - size); 273 memcpy(mp->mnt_stat.f_mntonname, fs->fs_fsmnt, MNAMELEN); 274 (void) copyinstr(args.fspec, mp->mnt_stat.f_mntfromname, MNAMELEN - 1, 275 &size); 276 memset(mp->mnt_stat.f_mntfromname + size, 0, MNAMELEN - size); 277 return (0); 278 } 279 280 int mfs_pri = PWAIT | PCATCH; /* XXX prob. temp */ 281 282 /* 283 * Used to grab the process and keep it in the kernel to service 284 * memory filesystem I/O requests. 285 * 286 * Loop servicing I/O requests. 287 * Copy the requested data into or out of the memory filesystem 288 * address space. 289 */ 290 /* ARGSUSED */ 291 int 292 mfs_start(mp, flags, p) 293 struct mount *mp; 294 int flags; 295 struct proc *p; 296 { 297 struct vnode *vp = VFSTOUFS(mp)->um_devvp; 298 struct mfsnode *mfsp = VTOMFS(vp); 299 struct buf *bp; 300 caddr_t base; 301 int sleepreturn = 0; 302 303 base = mfsp->mfs_baseoff; 304 while (BUFQ_FIRST(&mfsp->mfs_buflist) != (struct buf *) -1) { 305 /* 306 * If a non-ignored signal is received, try to unmount. 307 * If that fails, or the filesystem is already in the 308 * process of being unmounted, clear the signal (it has been 309 * "processed"), otherwise we will loop here, as tsleep 310 * will always return EINTR/ERESTART. 311 */ 312 if (sleepreturn != 0) { 313 if (vfs_busy(mp, LK_NOWAIT, 0) || 314 dounmount(mp, 0, p) != 0) 315 CLRSIG(p, CURSIG(p)); 316 sleepreturn = 0; 317 continue; 318 } 319 320 while ((bp = BUFQ_FIRST(&mfsp->mfs_buflist)) != NULL) { 321 BUFQ_REMOVE(&mfsp->mfs_buflist, bp); 322 mfs_doio(bp, base); 323 wakeup((caddr_t)bp); 324 } 325 sleepreturn = tsleep(vp, mfs_pri, "mfsidl", 0); 326 } 327 return (sleepreturn); 328 } 329 330 /* 331 * Get file system statistics. 332 */ 333 int 334 mfs_statfs(mp, sbp, p) 335 struct mount *mp; 336 struct statfs *sbp; 337 struct proc *p; 338 { 339 int error; 340 341 error = ffs_statfs(mp, sbp, p); 342 #ifdef COMPAT_09 343 sbp->f_type = 3; 344 #else 345 sbp->f_type = 0; 346 #endif 347 strncpy(&sbp->f_fstypename[0], mp->mnt_op->vfs_name, MFSNAMELEN); 348 return (error); 349 } 350
Indexes created Fri Sep 26 20:09:58 GMT 2025