mfs_vfsops.c revision 1.17
1 /* $NetBSD: mfs_vfsops.c,v 1.17 1998/07/05 08:49:49 jonathan 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 ffs_sysctl, 96 NULL, 97 mfs_vnodeopv_descs, 98 }; 99 100 /* 101 * Memory based filesystem initialization. 102 */ 103 void 104 mfs_init() 105 { 106 } 107 108 109 /* 110 * Called by main() when mfs is going to be mounted as root. 111 */ 112 113 int 114 mfs_mountroot() 115 { 116 extern struct vnode *rootvp; 117 struct fs *fs; 118 struct mount *mp; 119 struct proc *p = curproc; /* XXX */ 120 struct ufsmount *ump; 121 struct mfsnode *mfsp; 122 int error = 0; 123 124 /* 125 * Get vnodes for rootdev. 126 */ 127 if (bdevvp(rootdev, &rootvp)) { 128 printf("mfs_mountroot: can't setup bdevvp's"); 129 return (error); 130 } 131 132 if ((error = vfs_rootmountalloc(MOUNT_MFS, "mfs_root", &mp))) 133 return (error); 134 135 mfsp = malloc(sizeof *mfsp, M_MFSNODE, M_WAITOK); 136 rootvp->v_data = mfsp; 137 rootvp->v_op = mfs_vnodeop_p; 138 rootvp->v_tag = VT_MFS; 139 mfsp->mfs_baseoff = mfs_rootbase; 140 mfsp->mfs_size = mfs_rootsize; 141 mfsp->mfs_vnode = rootvp; 142 mfsp->mfs_pid = p->p_pid; 143 mfsp->mfs_buflist = (struct buf *)0; 144 if ((error = ffs_mountfs(rootvp, mp, p)) != 0) { 145 mp->mnt_op->vfs_refcount--; 146 vfs_unbusy(mp); 147 free(mp, M_MOUNT); 148 free(mfsp, M_MFSNODE); 149 return (error); 150 } 151 simple_lock(&mountlist_slock); 152 CIRCLEQ_INSERT_TAIL(&mountlist, mp, mnt_list); 153 simple_unlock(&mountlist_slock); 154 mp->mnt_vnodecovered = NULLVP; 155 ump = VFSTOUFS(mp); 156 fs = ump->um_fs; 157 (void) copystr(mp->mnt_stat.f_mntonname, fs->fs_fsmnt, MNAMELEN - 1, 0); 158 (void)ffs_statfs(mp, &mp->mnt_stat, p); 159 vfs_unbusy(mp); 160 inittodr((time_t)0); 161 return (0); 162 } 163 164 /* 165 * This is called early in boot to set the base address and size 166 * of the mini-root. 167 */ 168 int 169 mfs_initminiroot(base) 170 caddr_t base; 171 { 172 struct fs *fs = (struct fs *)(base + SBOFF); 173 extern int (*mountroot) __P((void)); 174 175 /* check for valid super block */ 176 if (fs->fs_magic != FS_MAGIC || fs->fs_bsize > MAXBSIZE || 177 fs->fs_bsize < sizeof(struct fs)) 178 return (0); 179 mountroot = mfs_mountroot; 180 mfs_rootbase = base; 181 mfs_rootsize = fs->fs_fsize * fs->fs_size; 182 rootdev = makedev(255, mfs_minor++); 183 return (mfs_rootsize); 184 } 185 186 /* 187 * VFS Operations. 188 * 189 * mount system call 190 */ 191 /* ARGSUSED */ 192 int 193 mfs_mount(mp, path, data, ndp, p) 194 register struct mount *mp; 195 const char *path; 196 void *data; 197 struct nameidata *ndp; 198 struct proc *p; 199 { 200 struct vnode *devvp; 201 struct mfs_args args; 202 struct ufsmount *ump; 203 register struct fs *fs; 204 register struct mfsnode *mfsp; 205 size_t size; 206 int flags, error; 207 208 error = copyin(data, (caddr_t)&args, sizeof (struct mfs_args)); 209 if (error) 210 return (error); 211 212 /* 213 * If updating, check whether changing from read-only to 214 * read/write; if there is no device name, that's all we do. 215 */ 216 if (mp->mnt_flag & MNT_UPDATE) { 217 ump = VFSTOUFS(mp); 218 fs = ump->um_fs; 219 if (fs->fs_ronly == 0 && (mp->mnt_flag & MNT_RDONLY)) { 220 flags = WRITECLOSE; 221 if (mp->mnt_flag & MNT_FORCE) 222 flags |= FORCECLOSE; 223 error = ffs_flushfiles(mp, flags, p); 224 if (error) 225 return (error); 226 } 227 if (fs->fs_ronly && (mp->mnt_flag & MNT_WANTRDWR)) 228 fs->fs_ronly = 0; 229 #ifdef EXPORTMFS 230 if (args.fspec == 0) 231 return (vfs_export(mp, &ump->um_export, &args.export)); 232 #endif 233 return (0); 234 } 235 error = getnewvnode(VT_MFS, (struct mount *)0, mfs_vnodeop_p, &devvp); 236 if (error) 237 return (error); 238 devvp->v_type = VBLK; 239 if (checkalias(devvp, makedev(255, mfs_minor++), (struct mount *)0)) 240 panic("mfs_mount: dup dev"); 241 mfsp = (struct mfsnode *)malloc(sizeof *mfsp, M_MFSNODE, M_WAITOK); 242 devvp->v_data = mfsp; 243 mfsp->mfs_baseoff = args.base; 244 mfsp->mfs_size = args.size; 245 mfsp->mfs_vnode = devvp; 246 mfsp->mfs_pid = p->p_pid; 247 mfsp->mfs_buflist = (struct buf *)0; 248 if ((error = ffs_mountfs(devvp, mp, p)) != 0) { 249 mfsp->mfs_buflist = (struct buf *)-1; 250 vrele(devvp); 251 return (error); 252 } 253 ump = VFSTOUFS(mp); 254 fs = ump->um_fs; 255 (void) copyinstr(path, fs->fs_fsmnt, sizeof(fs->fs_fsmnt) - 1, &size); 256 bzero(fs->fs_fsmnt + size, sizeof(fs->fs_fsmnt) - size); 257 bcopy(fs->fs_fsmnt, mp->mnt_stat.f_mntonname, MNAMELEN); 258 (void) copyinstr(args.fspec, mp->mnt_stat.f_mntfromname, MNAMELEN - 1, 259 &size); 260 bzero(mp->mnt_stat.f_mntfromname + size, MNAMELEN - size); 261 return (0); 262 } 263 264 int mfs_pri = PWAIT | PCATCH; /* XXX prob. temp */ 265 266 /* 267 * Used to grab the process and keep it in the kernel to service 268 * memory filesystem I/O requests. 269 * 270 * Loop servicing I/O requests. 271 * Copy the requested data into or out of the memory filesystem 272 * address space. 273 */ 274 /* ARGSUSED */ 275 int 276 mfs_start(mp, flags, p) 277 struct mount *mp; 278 int flags; 279 struct proc *p; 280 { 281 register struct vnode *vp = VFSTOUFS(mp)->um_devvp; 282 register struct mfsnode *mfsp = VTOMFS(vp); 283 register struct buf *bp; 284 register caddr_t base; 285 int sleepreturn = 0; 286 287 base = mfsp->mfs_baseoff; 288 while (mfsp->mfs_buflist != (struct buf *)-1) { 289 /* 290 * If a non-ignored signal is received, try to unmount. 291 * If that fails, or the filesystem is already in the 292 * process of being unmounted, clear the signal (it has been 293 * "processed"), otherwise we will loop here, as tsleep 294 * will always return EINTR/ERESTART. 295 */ 296 if (sleepreturn != 0) { 297 if (vfs_busy(mp, LK_NOWAIT, 0) || 298 dounmount(mp, 0, p) != 0) 299 CLRSIG(p, CURSIG(p)); 300 sleepreturn = 0; 301 continue; 302 } 303 304 while ((bp = mfsp->mfs_buflist) != NULL) { 305 mfsp->mfs_buflist = bp->b_actf; 306 mfs_doio(bp, base); 307 wakeup((caddr_t)bp); 308 } 309 sleepreturn = tsleep(vp, mfs_pri, "mfsidl", 0); 310 } 311 return (sleepreturn); 312 } 313 314 /* 315 * Get file system statistics. 316 */ 317 int 318 mfs_statfs(mp, sbp, p) 319 struct mount *mp; 320 struct statfs *sbp; 321 struct proc *p; 322 { 323 int error; 324 325 error = ffs_statfs(mp, sbp, p); 326 #ifdef COMPAT_09 327 sbp->f_type = 3; 328 #else 329 sbp->f_type = 0; 330 #endif 331 strncpy(&sbp->f_fstypename[0], mp->mnt_op->vfs_name, MFSNAMELEN); 332 return (error); 333 } 334
Indexes created Fri Sep 26 20:09:58 GMT 2025