mfs_vfsops.c revision 1.21
1 /* $NetBSD: mfs_vfsops.c,v 1.21 1999/07/17 01:08:30 wrstuden 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 ufs_check_export, 98 mfs_vnodeopv_descs, 99 }; 100 101 /* 102 * Memory based filesystem initialization. 103 */ 104 void 105 mfs_init() 106 { 107 } 108 109 110 /* 111 * Called by main() when mfs is going to be mounted as root. 112 */ 113 114 int 115 mfs_mountroot() 116 { 117 extern struct vnode *rootvp; 118 struct fs *fs; 119 struct mount *mp; 120 struct proc *p = curproc; /* XXX */ 121 struct ufsmount *ump; 122 struct mfsnode *mfsp; 123 int error = 0; 124 125 /* 126 * Get vnodes for rootdev. 127 */ 128 if (bdevvp(rootdev, &rootvp)) { 129 printf("mfs_mountroot: can't setup bdevvp's"); 130 return (error); 131 } 132 133 if ((error = vfs_rootmountalloc(MOUNT_MFS, "mfs_root", &mp))) { 134 vrele(rootvp); 135 return (error); 136 } 137 138 mfsp = malloc(sizeof *mfsp, M_MFSNODE, M_WAITOK); 139 rootvp->v_data = mfsp; 140 rootvp->v_op = mfs_vnodeop_p; 141 rootvp->v_tag = VT_MFS; 142 mfsp->mfs_baseoff = mfs_rootbase; 143 mfsp->mfs_size = mfs_rootsize; 144 mfsp->mfs_vnode = rootvp; 145 mfsp->mfs_pid = p->p_pid; 146 mfsp->mfs_buflist = (struct buf *)0; 147 if ((error = ffs_mountfs(rootvp, mp, p)) != 0) { 148 mp->mnt_op->vfs_refcount--; 149 vfs_unbusy(mp); 150 free(mp, M_MOUNT); 151 free(mfsp, M_MFSNODE); 152 vrele(rootvp); 153 return (error); 154 } 155 simple_lock(&mountlist_slock); 156 CIRCLEQ_INSERT_TAIL(&mountlist, mp, mnt_list); 157 simple_unlock(&mountlist_slock); 158 mp->mnt_vnodecovered = NULLVP; 159 ump = VFSTOUFS(mp); 160 fs = ump->um_fs; 161 (void) copystr(mp->mnt_stat.f_mntonname, fs->fs_fsmnt, MNAMELEN - 1, 0); 162 (void)ffs_statfs(mp, &mp->mnt_stat, p); 163 vfs_unbusy(mp); 164 inittodr((time_t)0); 165 return (0); 166 } 167 168 /* 169 * This is called early in boot to set the base address and size 170 * of the mini-root. 171 */ 172 int 173 mfs_initminiroot(base) 174 caddr_t base; 175 { 176 struct fs *fs = (struct fs *)(base + SBOFF); 177 extern int (*mountroot) __P((void)); 178 179 /* check for valid super block */ 180 if (fs->fs_magic != FS_MAGIC || fs->fs_bsize > MAXBSIZE || 181 fs->fs_bsize < sizeof(struct fs)) 182 return (0); 183 mountroot = mfs_mountroot; 184 mfs_rootbase = base; 185 mfs_rootsize = fs->fs_fsize * fs->fs_size; 186 rootdev = makedev(255, mfs_minor++); 187 return (mfs_rootsize); 188 } 189 190 /* 191 * VFS Operations. 192 * 193 * mount system call 194 */ 195 /* ARGSUSED */ 196 int 197 mfs_mount(mp, path, data, ndp, p) 198 register struct mount *mp; 199 const char *path; 200 void *data; 201 struct nameidata *ndp; 202 struct proc *p; 203 { 204 struct vnode *devvp; 205 struct mfs_args args; 206 struct ufsmount *ump; 207 register struct fs *fs; 208 register struct mfsnode *mfsp; 209 size_t size; 210 int flags, error; 211 212 error = copyin(data, (caddr_t)&args, sizeof (struct mfs_args)); 213 if (error) 214 return (error); 215 216 /* 217 * If updating, check whether changing from read-only to 218 * read/write; if there is no device name, that's all we do. 219 */ 220 if (mp->mnt_flag & MNT_UPDATE) { 221 ump = VFSTOUFS(mp); 222 fs = ump->um_fs; 223 if (fs->fs_ronly == 0 && (mp->mnt_flag & MNT_RDONLY)) { 224 flags = WRITECLOSE; 225 if (mp->mnt_flag & MNT_FORCE) 226 flags |= FORCECLOSE; 227 error = ffs_flushfiles(mp, flags, p); 228 if (error) 229 return (error); 230 } 231 if (fs->fs_ronly && (mp->mnt_flag & MNT_WANTRDWR)) 232 fs->fs_ronly = 0; 233 if (args.fspec == 0) 234 return (vfs_export(mp, &ump->um_export, &args.export)); 235 return (0); 236 } 237 error = getnewvnode(VT_MFS, (struct mount *)0, mfs_vnodeop_p, &devvp); 238 if (error) 239 return (error); 240 devvp->v_type = VBLK; 241 if (checkalias(devvp, makedev(255, mfs_minor++), (struct mount *)0)) 242 panic("mfs_mount: dup dev"); 243 mfsp = (struct mfsnode *)malloc(sizeof *mfsp, M_MFSNODE, M_WAITOK); 244 devvp->v_data = mfsp; 245 mfsp->mfs_baseoff = args.base; 246 mfsp->mfs_size = args.size; 247 mfsp->mfs_vnode = devvp; 248 mfsp->mfs_pid = p->p_pid; 249 mfsp->mfs_buflist = (struct buf *)0; 250 if ((error = ffs_mountfs(devvp, mp, p)) != 0) { 251 mfsp->mfs_buflist = (struct buf *)-1; 252 vrele(devvp); 253 return (error); 254 } 255 ump = VFSTOUFS(mp); 256 fs = ump->um_fs; 257 (void) copyinstr(path, fs->fs_fsmnt, sizeof(fs->fs_fsmnt) - 1, &size); 258 memset(fs->fs_fsmnt + size, 0, sizeof(fs->fs_fsmnt) - size); 259 memcpy(mp->mnt_stat.f_mntonname, fs->fs_fsmnt, MNAMELEN); 260 (void) copyinstr(args.fspec, mp->mnt_stat.f_mntfromname, MNAMELEN - 1, 261 &size); 262 memset(mp->mnt_stat.f_mntfromname + size, 0, MNAMELEN - size); 263 return (0); 264 } 265 266 int mfs_pri = PWAIT | PCATCH; /* XXX prob. temp */ 267 268 /* 269 * Used to grab the process and keep it in the kernel to service 270 * memory filesystem I/O requests. 271 * 272 * Loop servicing I/O requests. 273 * Copy the requested data into or out of the memory filesystem 274 * address space. 275 */ 276 /* ARGSUSED */ 277 int 278 mfs_start(mp, flags, p) 279 struct mount *mp; 280 int flags; 281 struct proc *p; 282 { 283 register struct vnode *vp = VFSTOUFS(mp)->um_devvp; 284 register struct mfsnode *mfsp = VTOMFS(vp); 285 register struct buf *bp; 286 register caddr_t base; 287 int sleepreturn = 0; 288 289 base = mfsp->mfs_baseoff; 290 while (mfsp->mfs_buflist != (struct buf *)-1) { 291 /* 292 * If a non-ignored signal is received, try to unmount. 293 * If that fails, or the filesystem is already in the 294 * process of being unmounted, clear the signal (it has been 295 * "processed"), otherwise we will loop here, as tsleep 296 * will always return EINTR/ERESTART. 297 */ 298 if (sleepreturn != 0) { 299 if (vfs_busy(mp, LK_NOWAIT, 0) || 300 dounmount(mp, 0, p) != 0) 301 CLRSIG(p, CURSIG(p)); 302 sleepreturn = 0; 303 continue; 304 } 305 306 while ((bp = mfsp->mfs_buflist) != NULL) { 307 mfsp->mfs_buflist = bp->b_actf; 308 mfs_doio(bp, base); 309 wakeup((caddr_t)bp); 310 } 311 sleepreturn = tsleep(vp, mfs_pri, "mfsidl", 0); 312 } 313 return (sleepreturn); 314 } 315 316 /* 317 * Get file system statistics. 318 */ 319 int 320 mfs_statfs(mp, sbp, p) 321 struct mount *mp; 322 struct statfs *sbp; 323 struct proc *p; 324 { 325 int error; 326 327 error = ffs_statfs(mp, sbp, p); 328 #ifdef COMPAT_09 329 sbp->f_type = 3; 330 #else 331 sbp->f_type = 0; 332 #endif 333 strncpy(&sbp->f_fstypename[0], mp->mnt_op->vfs_name, MFSNAMELEN); 334 return (error); 335 } 336
Indexes created Fri Sep 26 20:09:58 GMT 2025