mfs_vfsops.c revision 1.4
1 /* $NetBSD: mfs_vfsops.c,v 1.4 1995/01/18 06:19:54 mycroft 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 8.4 (Berkeley) 4/16/94 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)(); 66 67 /* 68 * mfs vfs operations. 69 */ 70 struct vfsops mfs_vfsops = { 71 MOUNT_MFS, 72 mfs_mount, 73 mfs_start, 74 ffs_unmount, 75 ufs_root, 76 ufs_quotactl, 77 mfs_statfs, 78 ffs_sync, 79 ffs_vget, 80 ffs_fhtovp, 81 ffs_vptofh, 82 mfs_init, 83 }; 84 85 /* 86 * Called by main() when mfs is going to be mounted as root. 87 * 88 * Name is updated by mount(8) after booting. 89 */ 90 #define ROOTNAME "mfs_root" 91 92 mfs_mountroot() 93 { 94 extern struct vnode *rootvp; 95 register struct fs *fs; 96 register struct mount *mp; 97 struct proc *p = curproc; /* XXX */ 98 struct ufsmount *ump; 99 struct mfsnode *mfsp; 100 u_int size; 101 int error; 102 103 /* 104 * Get vnodes for swapdev and rootdev. 105 */ 106 if (bdevvp(swapdev, &swapdev_vp) || bdevvp(rootdev, &rootvp)) 107 panic("mfs_mountroot: can't setup bdevvp's"); 108 109 mp = malloc((u_long)sizeof(struct mount), M_MOUNT, M_WAITOK); 110 bzero((char *)mp, (u_long)sizeof(struct mount)); 111 mp->mnt_op = &mfs_vfsops; 112 mp->mnt_flag = MNT_RDONLY; 113 mfsp = malloc(sizeof *mfsp, M_MFSNODE, M_WAITOK); 114 rootvp->v_data = mfsp; 115 rootvp->v_op = mfs_vnodeop_p; 116 rootvp->v_tag = VT_MFS; 117 mfsp->mfs_baseoff = mfs_rootbase; 118 mfsp->mfs_size = mfs_rootsize; 119 mfsp->mfs_vnode = rootvp; 120 mfsp->mfs_pid = p->p_pid; 121 mfsp->mfs_buflist = (struct buf *)0; 122 if (error = ffs_mountfs(rootvp, mp, p)) { 123 free(mp, M_MOUNT); 124 free(mfsp, M_MFSNODE); 125 return (error); 126 } 127 if (error = vfs_lock(mp)) { 128 (void)ffs_unmount(mp, 0, p); 129 free(mp, M_MOUNT); 130 free(mfsp, M_MFSNODE); 131 return (error); 132 } 133 CIRCLEQ_INSERT_TAIL(&mountlist, mp, mnt_list); 134 mp->mnt_vnodecovered = NULLVP; 135 ump = VFSTOUFS(mp); 136 fs = ump->um_fs; 137 bzero(fs->fs_fsmnt, sizeof(fs->fs_fsmnt)); 138 fs->fs_fsmnt[0] = '/'; 139 bcopy((caddr_t)fs->fs_fsmnt, (caddr_t)mp->mnt_stat.f_mntonname, 140 MNAMELEN); 141 (void) copystr(ROOTNAME, mp->mnt_stat.f_mntfromname, MNAMELEN - 1, 142 &size); 143 bzero(mp->mnt_stat.f_mntfromname + size, MNAMELEN - size); 144 (void)ffs_statfs(mp, &mp->mnt_stat, p); 145 vfs_unlock(mp); 146 inittodr((time_t)0); 147 return (0); 148 } 149 150 /* 151 * This is called early in boot to set the base address and size 152 * of the mini-root. 153 */ 154 mfs_initminiroot(base) 155 caddr_t base; 156 { 157 struct fs *fs = (struct fs *)(base + SBOFF); 158 extern int (*mountroot)(); 159 160 /* check for valid super block */ 161 if (fs->fs_magic != FS_MAGIC || fs->fs_bsize > MAXBSIZE || 162 fs->fs_bsize < sizeof(struct fs)) 163 return (0); 164 mountroot = mfs_mountroot; 165 mfs_rootbase = base; 166 mfs_rootsize = fs->fs_fsize * fs->fs_size; 167 rootdev = makedev(255, mfs_minor++); 168 return (mfs_rootsize); 169 } 170 171 /* 172 * VFS Operations. 173 * 174 * mount system call 175 */ 176 /* ARGSUSED */ 177 int 178 mfs_mount(mp, path, data, ndp, p) 179 register struct mount *mp; 180 char *path; 181 caddr_t data; 182 struct nameidata *ndp; 183 struct proc *p; 184 { 185 struct vnode *devvp; 186 struct mfs_args args; 187 struct ufsmount *ump; 188 register struct fs *fs; 189 register struct mfsnode *mfsp; 190 u_int size; 191 int flags, error; 192 193 if (error = copyin(data, (caddr_t)&args, sizeof (struct mfs_args))) 194 return (error); 195 196 /* 197 * If updating, check whether changing from read-only to 198 * read/write; if there is no device name, that's all we do. 199 */ 200 if (mp->mnt_flag & MNT_UPDATE) { 201 ump = VFSTOUFS(mp); 202 fs = ump->um_fs; 203 if (fs->fs_ronly == 0 && (mp->mnt_flag & MNT_RDONLY)) { 204 flags = WRITECLOSE; 205 if (mp->mnt_flag & MNT_FORCE) 206 flags |= FORCECLOSE; 207 if (vfs_busy(mp)) 208 return (EBUSY); 209 error = ffs_flushfiles(mp, flags, p); 210 vfs_unbusy(mp); 211 if (error) 212 return (error); 213 } 214 if (fs->fs_ronly && (mp->mnt_flag & MNT_WANTRDWR)) 215 fs->fs_ronly = 0; 216 #ifdef EXPORTMFS 217 if (args.fspec == 0) 218 return (vfs_export(mp, &ump->um_export, &args.export)); 219 #endif 220 return (0); 221 } 222 error = getnewvnode(VT_MFS, (struct mount *)0, mfs_vnodeop_p, &devvp); 223 if (error) 224 return (error); 225 devvp->v_type = VBLK; 226 if (checkalias(devvp, makedev(255, mfs_minor++), (struct mount *)0)) 227 panic("mfs_mount: dup dev"); 228 mfsp = (struct mfsnode *)malloc(sizeof *mfsp, M_MFSNODE, M_WAITOK); 229 devvp->v_data = mfsp; 230 mfsp->mfs_baseoff = args.base; 231 mfsp->mfs_size = args.size; 232 mfsp->mfs_vnode = devvp; 233 mfsp->mfs_pid = p->p_pid; 234 mfsp->mfs_buflist = (struct buf *)0; 235 if (error = ffs_mountfs(devvp, mp, p)) { 236 mfsp->mfs_buflist = (struct buf *)-1; 237 vrele(devvp); 238 return (error); 239 } 240 ump = VFSTOUFS(mp); 241 fs = ump->um_fs; 242 (void) copyinstr(path, fs->fs_fsmnt, sizeof(fs->fs_fsmnt) - 1, &size); 243 bzero(fs->fs_fsmnt + size, sizeof(fs->fs_fsmnt) - size); 244 bcopy((caddr_t)fs->fs_fsmnt, (caddr_t)mp->mnt_stat.f_mntonname, 245 MNAMELEN); 246 (void) copyinstr(args.fspec, mp->mnt_stat.f_mntfromname, MNAMELEN - 1, 247 &size); 248 bzero(mp->mnt_stat.f_mntfromname + size, MNAMELEN - size); 249 return (0); 250 } 251 252 int mfs_pri = PWAIT | PCATCH; /* XXX prob. temp */ 253 254 /* 255 * Used to grab the process and keep it in the kernel to service 256 * memory filesystem I/O requests. 257 * 258 * Loop servicing I/O requests. 259 * Copy the requested data into or out of the memory filesystem 260 * address space. 261 */ 262 /* ARGSUSED */ 263 int 264 mfs_start(mp, flags, p) 265 struct mount *mp; 266 int flags; 267 struct proc *p; 268 { 269 register struct vnode *vp = VFSTOUFS(mp)->um_devvp; 270 register struct mfsnode *mfsp = VTOMFS(vp); 271 register struct buf *bp; 272 register caddr_t base; 273 int error = 0; 274 275 base = mfsp->mfs_baseoff; 276 while (mfsp->mfs_buflist != (struct buf *)(-1)) { 277 while (bp = mfsp->mfs_buflist) { 278 mfsp->mfs_buflist = bp->b_actf; 279 mfs_doio(bp, base); 280 wakeup((caddr_t)bp); 281 } 282 /* 283 * If a non-ignored signal is received, try to unmount. 284 * If that fails, clear the signal (it has been "processed"), 285 * otherwise we will loop here, as tsleep will always return 286 * EINTR/ERESTART. 287 */ 288 if (error = tsleep((caddr_t)vp, mfs_pri, "mfsidl", 0)) 289 if (dounmount(mp, 0, p) != 0) 290 CLRSIG(p, CURSIG(p)); 291 } 292 return (error); 293 } 294 295 /* 296 * Get file system statistics. 297 */ 298 mfs_statfs(mp, sbp, p) 299 struct mount *mp; 300 struct statfs *sbp; 301 struct proc *p; 302 { 303 int error; 304 305 error = ffs_statfs(mp, sbp, p); 306 #ifdef COMPAT_09 307 sbp->f_type = 3; 308 #else 309 sbp->f_type = 0; 310 #endif 311 strncpy(&sbp->f_fstypename[0], mp->mnt_op->vfs_name, MFSNAMELEN); 312 sbp->f_fstypename[MFSNAMELEN] = '\0'; 313 return (error); 314 } 315
Indexes created Sat Oct 18 17:09:52 GMT 2025