mfs_vfsops.c revision 1.19
1 /* $NetBSD: mfs_vfsops.c,v 1.19 1999/02/26 23:44:50 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 return (error); 135 136 mfsp = malloc(sizeof *mfsp, M_MFSNODE, M_WAITOK); 137 rootvp->v_data = mfsp; 138 rootvp->v_op = mfs_vnodeop_p; 139 rootvp->v_tag = VT_MFS; 140 mfsp->mfs_baseoff = mfs_rootbase; 141 mfsp->mfs_size = mfs_rootsize; 142 mfsp->mfs_vnode = rootvp; 143 mfsp->mfs_pid = p->p_pid; 144 mfsp->mfs_buflist = (struct buf *)0; 145 if ((error = ffs_mountfs(rootvp, mp, p)) != 0) { 146 mp->mnt_op->vfs_refcount--; 147 vfs_unbusy(mp); 148 free(mp, M_MOUNT); 149 free(mfsp, M_MFSNODE); 150 return (error); 151 } 152 simple_lock(&mountlist_slock); 153 CIRCLEQ_INSERT_TAIL(&mountlist, mp, mnt_list); 154 simple_unlock(&mountlist_slock); 155 mp->mnt_vnodecovered = NULLVP; 156 ump = VFSTOUFS(mp); 157 fs = ump->um_fs; 158 (void) copystr(mp->mnt_stat.f_mntonname, fs->fs_fsmnt, MNAMELEN - 1, 0); 159 (void)ffs_statfs(mp, &mp->mnt_stat, p); 160 vfs_unbusy(mp); 161 inittodr((time_t)0); 162 return (0); 163 } 164 165 /* 166 * This is called early in boot to set the base address and size 167 * of the mini-root. 168 */ 169 int 170 mfs_initminiroot(base) 171 caddr_t base; 172 { 173 struct fs *fs = (struct fs *)(base + SBOFF); 174 extern int (*mountroot) __P((void)); 175 176 /* check for valid super block */ 177 if (fs->fs_magic != FS_MAGIC || fs->fs_bsize > MAXBSIZE || 178 fs->fs_bsize < sizeof(struct fs)) 179 return (0); 180 mountroot = mfs_mountroot; 181 mfs_rootbase = base; 182 mfs_rootsize = fs->fs_fsize * fs->fs_size; 183 rootdev = makedev(255, mfs_minor++); 184 return (mfs_rootsize); 185 } 186 187 /* 188 * VFS Operations. 189 * 190 * mount system call 191 */ 192 /* ARGSUSED */ 193 int 194 mfs_mount(mp, path, data, ndp, p) 195 register struct mount *mp; 196 const char *path; 197 void *data; 198 struct nameidata *ndp; 199 struct proc *p; 200 { 201 struct vnode *devvp; 202 struct mfs_args args; 203 struct ufsmount *ump; 204 register struct fs *fs; 205 register struct mfsnode *mfsp; 206 size_t size; 207 int flags, error; 208 209 error = copyin(data, (caddr_t)&args, sizeof (struct mfs_args)); 210 if (error) 211 return (error); 212 213 /* 214 * If updating, check whether changing from read-only to 215 * read/write; if there is no device name, that's all we do. 216 */ 217 if (mp->mnt_flag & MNT_UPDATE) { 218 ump = VFSTOUFS(mp); 219 fs = ump->um_fs; 220 if (fs->fs_ronly == 0 && (mp->mnt_flag & MNT_RDONLY)) { 221 flags = WRITECLOSE; 222 if (mp->mnt_flag & MNT_FORCE) 223 flags |= FORCECLOSE; 224 error = ffs_flushfiles(mp, flags, p); 225 if (error) 226 return (error); 227 } 228 if (fs->fs_ronly && (mp->mnt_flag & MNT_WANTRDWR)) 229 fs->fs_ronly = 0; 230 #ifdef EXPORTMFS 231 if (args.fspec == 0) 232 return (vfs_export(mp, &ump->um_export, &args.export)); 233 #endif 234 return (0); 235 } 236 error = getnewvnode(VT_MFS, (struct mount *)0, mfs_vnodeop_p, &devvp); 237 if (error) 238 return (error); 239 devvp->v_type = VBLK; 240 if (checkalias(devvp, makedev(255, mfs_minor++), (struct mount *)0)) 241 panic("mfs_mount: dup dev"); 242 mfsp = (struct mfsnode *)malloc(sizeof *mfsp, M_MFSNODE, M_WAITOK); 243 devvp->v_data = mfsp; 244 mfsp->mfs_baseoff = args.base; 245 mfsp->mfs_size = args.size; 246 mfsp->mfs_vnode = devvp; 247 mfsp->mfs_pid = p->p_pid; 248 mfsp->mfs_buflist = (struct buf *)0; 249 if ((error = ffs_mountfs(devvp, mp, p)) != 0) { 250 mfsp->mfs_buflist = (struct buf *)-1; 251 vrele(devvp); 252 return (error); 253 } 254 ump = VFSTOUFS(mp); 255 fs = ump->um_fs; 256 (void) copyinstr(path, fs->fs_fsmnt, sizeof(fs->fs_fsmnt) - 1, &size); 257 memset(fs->fs_fsmnt + size, 0, sizeof(fs->fs_fsmnt) - size); 258 memcpy(mp->mnt_stat.f_mntonname, fs->fs_fsmnt, MNAMELEN); 259 (void) copyinstr(args.fspec, mp->mnt_stat.f_mntfromname, MNAMELEN - 1, 260 &size); 261 memset(mp->mnt_stat.f_mntfromname + size, 0, MNAMELEN - size); 262 return (0); 263 } 264 265 int mfs_pri = PWAIT | PCATCH; /* XXX prob. temp */ 266 267 /* 268 * Used to grab the process and keep it in the kernel to service 269 * memory filesystem I/O requests. 270 * 271 * Loop servicing I/O requests. 272 * Copy the requested data into or out of the memory filesystem 273 * address space. 274 */ 275 /* ARGSUSED */ 276 int 277 mfs_start(mp, flags, p) 278 struct mount *mp; 279 int flags; 280 struct proc *p; 281 { 282 register struct vnode *vp = VFSTOUFS(mp)->um_devvp; 283 register struct mfsnode *mfsp = VTOMFS(vp); 284 register struct buf *bp; 285 register caddr_t base; 286 int sleepreturn = 0; 287 288 base = mfsp->mfs_baseoff; 289 while (mfsp->mfs_buflist != (struct buf *)-1) { 290 /* 291 * If a non-ignored signal is received, try to unmount. 292 * If that fails, or the filesystem is already in the 293 * process of being unmounted, clear the signal (it has been 294 * "processed"), otherwise we will loop here, as tsleep 295 * will always return EINTR/ERESTART. 296 */ 297 if (sleepreturn != 0) { 298 if (vfs_busy(mp, LK_NOWAIT, 0) || 299 dounmount(mp, 0, p) != 0) 300 CLRSIG(p, CURSIG(p)); 301 sleepreturn = 0; 302 continue; 303 } 304 305 while ((bp = mfsp->mfs_buflist) != NULL) { 306 mfsp->mfs_buflist = bp->b_actf; 307 mfs_doio(bp, base); 308 wakeup((caddr_t)bp); 309 } 310 sleepreturn = tsleep(vp, mfs_pri, "mfsidl", 0); 311 } 312 return (sleepreturn); 313 } 314 315 /* 316 * Get file system statistics. 317 */ 318 int 319 mfs_statfs(mp, sbp, p) 320 struct mount *mp; 321 struct statfs *sbp; 322 struct proc *p; 323 { 324 int error; 325 326 error = ffs_statfs(mp, sbp, p); 327 #ifdef COMPAT_09 328 sbp->f_type = 3; 329 #else 330 sbp->f_type = 0; 331 #endif 332 strncpy(&sbp->f_fstypename[0], mp->mnt_op->vfs_name, MFSNAMELEN); 333 return (error); 334 } 335
Indexes created Sat Sep 27 22:09:54 GMT 2025