mfs_vfsops.c revision 1.15
1 /* $NetBSD: mfs_vfsops.c,v 1.15 1998/03/01 02:23:29 fvdl 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/param.h> 39 #include <sys/systm.h> 40 #include <sys/time.h> 41 #include <sys/kernel.h> 42 #include <sys/proc.h> 43 #include <sys/buf.h> 44 #include <sys/mount.h> 45 #include <sys/signalvar.h> 46 #include <sys/vnode.h> 47 #include <sys/malloc.h> 48 49 #include <ufs/ufs/quota.h> 50 #include <ufs/ufs/inode.h> 51 #include <ufs/ufs/ufsmount.h> 52 #include <ufs/ufs/ufs_extern.h> 53 54 #include <ufs/ffs/fs.h> 55 #include <ufs/ffs/ffs_extern.h> 56 57 #include <ufs/mfs/mfsnode.h> 58 #include <ufs/mfs/mfs_extern.h> 59 60 caddr_t mfs_rootbase; /* address of mini-root in kernel virtual memory */ 61 u_long mfs_rootsize; /* size of mini-root in bytes */ 62 63 static int mfs_minor; /* used for building internal dev_t */ 64 65 extern int (**mfs_vnodeop_p) __P((void *)); 66 67 /* 68 * mfs vfs operations. 69 */ 70 71 extern struct vnodeopv_desc mfs_vnodeop_opv_desc; 72 73 struct vnodeopv_desc *mfs_vnodeopv_descs[] = { 74 &mfs_vnodeop_opv_desc, 75 NULL, 76 }; 77 78 struct vfsops mfs_vfsops = { 79 MOUNT_MFS, 80 mfs_mount, 81 mfs_start, 82 ffs_unmount, 83 ufs_root, 84 ufs_quotactl, 85 mfs_statfs, 86 ffs_sync, 87 ffs_vget, 88 ffs_fhtovp, 89 ffs_vptofh, 90 mfs_init, 91 ffs_sysctl, 92 mfs_mountroot, 93 mfs_vnodeopv_descs, 94 }; 95 96 /* 97 * Memory based filesystem initialization. 98 */ 99 void 100 mfs_init() 101 { 102 } 103 104 105 /* 106 * Called by main() when mfs is going to be mounted as root. 107 */ 108 109 int 110 mfs_mountroot() 111 { 112 extern struct vnode *rootvp; 113 struct fs *fs; 114 struct mount *mp; 115 struct proc *p = curproc; /* XXX */ 116 struct ufsmount *ump; 117 struct mfsnode *mfsp; 118 int error = 0; 119 120 /* 121 * Get vnodes for rootdev. 122 */ 123 if (bdevvp(rootdev, &rootvp)) { 124 printf("mfs_mountroot: can't setup bdevvp's"); 125 return (error); 126 } 127 128 if ((error = vfs_rootmountalloc(MOUNT_MFS, "mfs_root", &mp))) 129 return (error); 130 131 mfsp = malloc(sizeof *mfsp, M_MFSNODE, M_WAITOK); 132 rootvp->v_data = mfsp; 133 rootvp->v_op = mfs_vnodeop_p; 134 rootvp->v_tag = VT_MFS; 135 mfsp->mfs_baseoff = mfs_rootbase; 136 mfsp->mfs_size = mfs_rootsize; 137 mfsp->mfs_vnode = rootvp; 138 mfsp->mfs_pid = p->p_pid; 139 mfsp->mfs_buflist = (struct buf *)0; 140 if ((error = ffs_mountfs(rootvp, mp, p)) != 0) { 141 mp->mnt_op->vfs_refcount--; 142 vfs_unbusy(mp); 143 free(mp, M_MOUNT); 144 free(mfsp, M_MFSNODE); 145 return (error); 146 } 147 simple_lock(&mountlist_slock); 148 CIRCLEQ_INSERT_TAIL(&mountlist, mp, mnt_list); 149 simple_unlock(&mountlist_slock); 150 mp->mnt_vnodecovered = NULLVP; 151 ump = VFSTOUFS(mp); 152 fs = ump->um_fs; 153 (void) copystr(mp->mnt_stat.f_mntonname, fs->fs_fsmnt, MNAMELEN - 1, 0); 154 (void)ffs_statfs(mp, &mp->mnt_stat, p); 155 vfs_unbusy(mp); 156 inittodr((time_t)0); 157 return (0); 158 } 159 160 /* 161 * This is called early in boot to set the base address and size 162 * of the mini-root. 163 */ 164 int 165 mfs_initminiroot(base) 166 caddr_t base; 167 { 168 struct fs *fs = (struct fs *)(base + SBOFF); 169 extern int (*mountroot) __P((void)); 170 171 /* check for valid super block */ 172 if (fs->fs_magic != FS_MAGIC || fs->fs_bsize > MAXBSIZE || 173 fs->fs_bsize < sizeof(struct fs)) 174 return (0); 175 mountroot = mfs_mountroot; 176 mfs_rootbase = base; 177 mfs_rootsize = fs->fs_fsize * fs->fs_size; 178 rootdev = makedev(255, mfs_minor++); 179 return (mfs_rootsize); 180 } 181 182 /* 183 * VFS Operations. 184 * 185 * mount system call 186 */ 187 /* ARGSUSED */ 188 int 189 mfs_mount(mp, path, data, ndp, p) 190 register struct mount *mp; 191 const char *path; 192 void *data; 193 struct nameidata *ndp; 194 struct proc *p; 195 { 196 struct vnode *devvp; 197 struct mfs_args args; 198 struct ufsmount *ump; 199 register struct fs *fs; 200 register struct mfsnode *mfsp; 201 size_t size; 202 int flags, error; 203 204 error = copyin(data, (caddr_t)&args, sizeof (struct mfs_args)); 205 if (error) 206 return (error); 207 208 /* 209 * If updating, check whether changing from read-only to 210 * read/write; if there is no device name, that's all we do. 211 */ 212 if (mp->mnt_flag & MNT_UPDATE) { 213 ump = VFSTOUFS(mp); 214 fs = ump->um_fs; 215 if (fs->fs_ronly == 0 && (mp->mnt_flag & MNT_RDONLY)) { 216 flags = WRITECLOSE; 217 if (mp->mnt_flag & MNT_FORCE) 218 flags |= FORCECLOSE; 219 error = ffs_flushfiles(mp, flags, p); 220 if (error) 221 return (error); 222 } 223 if (fs->fs_ronly && (mp->mnt_flag & MNT_WANTRDWR)) 224 fs->fs_ronly = 0; 225 #ifdef EXPORTMFS 226 if (args.fspec == 0) 227 return (vfs_export(mp, &ump->um_export, &args.export)); 228 #endif 229 return (0); 230 } 231 error = getnewvnode(VT_MFS, (struct mount *)0, mfs_vnodeop_p, &devvp); 232 if (error) 233 return (error); 234 devvp->v_type = VBLK; 235 if (checkalias(devvp, makedev(255, mfs_minor++), (struct mount *)0)) 236 panic("mfs_mount: dup dev"); 237 mfsp = (struct mfsnode *)malloc(sizeof *mfsp, M_MFSNODE, M_WAITOK); 238 devvp->v_data = mfsp; 239 mfsp->mfs_baseoff = args.base; 240 mfsp->mfs_size = args.size; 241 mfsp->mfs_vnode = devvp; 242 mfsp->mfs_pid = p->p_pid; 243 mfsp->mfs_buflist = (struct buf *)0; 244 if ((error = ffs_mountfs(devvp, mp, p)) != 0) { 245 mfsp->mfs_buflist = (struct buf *)-1; 246 vrele(devvp); 247 return (error); 248 } 249 ump = VFSTOUFS(mp); 250 fs = ump->um_fs; 251 (void) copyinstr(path, fs->fs_fsmnt, sizeof(fs->fs_fsmnt) - 1, &size); 252 bzero(fs->fs_fsmnt + size, sizeof(fs->fs_fsmnt) - size); 253 bcopy(fs->fs_fsmnt, mp->mnt_stat.f_mntonname, MNAMELEN); 254 (void) copyinstr(args.fspec, mp->mnt_stat.f_mntfromname, MNAMELEN - 1, 255 &size); 256 bzero(mp->mnt_stat.f_mntfromname + size, MNAMELEN - size); 257 return (0); 258 } 259 260 int mfs_pri = PWAIT | PCATCH; /* XXX prob. temp */ 261 262 /* 263 * Used to grab the process and keep it in the kernel to service 264 * memory filesystem I/O requests. 265 * 266 * Loop servicing I/O requests. 267 * Copy the requested data into or out of the memory filesystem 268 * address space. 269 */ 270 /* ARGSUSED */ 271 int 272 mfs_start(mp, flags, p) 273 struct mount *mp; 274 int flags; 275 struct proc *p; 276 { 277 register struct vnode *vp = VFSTOUFS(mp)->um_devvp; 278 register struct mfsnode *mfsp = VTOMFS(vp); 279 register struct buf *bp; 280 register caddr_t base; 281 int sleepreturn = 0; 282 283 base = mfsp->mfs_baseoff; 284 while (mfsp->mfs_buflist != (struct buf *)-1) { 285 /* 286 * If a non-ignored signal is received, try to unmount. 287 * If that fails, or the filesystem is already in the 288 * process of being unmounted, clear the signal (it has been 289 * "processed"), otherwise we will loop here, as tsleep 290 * will always return EINTR/ERESTART. 291 */ 292 if (sleepreturn != 0) { 293 if (vfs_busy(mp, LK_NOWAIT, 0) || 294 dounmount(mp, 0, p) != 0) 295 CLRSIG(p, CURSIG(p)); 296 sleepreturn = 0; 297 continue; 298 } 299 300 while ((bp = mfsp->mfs_buflist) != NULL) { 301 mfsp->mfs_buflist = bp->b_actf; 302 mfs_doio(bp, base); 303 wakeup((caddr_t)bp); 304 } 305 sleepreturn = tsleep(vp, mfs_pri, "mfsidl", 0); 306 } 307 return (sleepreturn); 308 } 309 310 /* 311 * Get file system statistics. 312 */ 313 int 314 mfs_statfs(mp, sbp, p) 315 struct mount *mp; 316 struct statfs *sbp; 317 struct proc *p; 318 { 319 int error; 320 321 error = ffs_statfs(mp, sbp, p); 322 #ifdef COMPAT_09 323 sbp->f_type = 3; 324 #else 325 sbp->f_type = 0; 326 #endif 327 strncpy(&sbp->f_fstypename[0], mp->mnt_op->vfs_name, MFSNAMELEN); 328 return (error); 329 } 330
Indexes created Mon Sep 29 03:10:08 GMT 2025