mfs_vfsops.c revision 1.9
1 /* $NetBSD: mfs_vfsops.c,v 1.9 1995/09/01 19:39:18 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 size_t 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(fs->fs_fsmnt, mp->mnt_stat.f_mntonname, MNAMELEN); 140 (void) copystr(ROOTNAME, mp->mnt_stat.f_mntfromname, MNAMELEN - 1, 141 &size); 142 bzero(mp->mnt_stat.f_mntfromname + size, MNAMELEN - size); 143 (void)ffs_statfs(mp, &mp->mnt_stat, p); 144 vfs_unlock(mp); 145 inittodr((time_t)0); 146 return (0); 147 } 148 149 /* 150 * This is called early in boot to set the base address and size 151 * of the mini-root. 152 */ 153 mfs_initminiroot(base) 154 caddr_t base; 155 { 156 struct fs *fs = (struct fs *)(base + SBOFF); 157 extern int (*mountroot)(); 158 159 /* check for valid super block */ 160 if (fs->fs_magic != FS_MAGIC || fs->fs_bsize > MAXBSIZE || 161 fs->fs_bsize < sizeof(struct fs)) 162 return (0); 163 mountroot = mfs_mountroot; 164 mfs_rootbase = base; 165 mfs_rootsize = fs->fs_fsize * fs->fs_size; 166 rootdev = makedev(255, mfs_minor++); 167 return (mfs_rootsize); 168 } 169 170 /* 171 * VFS Operations. 172 * 173 * mount system call 174 */ 175 /* ARGSUSED */ 176 int 177 mfs_mount(mp, path, data, ndp, p) 178 register struct mount *mp; 179 char *path; 180 caddr_t data; 181 struct nameidata *ndp; 182 struct proc *p; 183 { 184 struct vnode *devvp; 185 struct mfs_args args; 186 struct ufsmount *ump; 187 register struct fs *fs; 188 register struct mfsnode *mfsp; 189 size_t size; 190 int flags, error; 191 192 if (error = copyin(data, (caddr_t)&args, sizeof (struct mfs_args))) 193 return (error); 194 195 /* 196 * If updating, check whether changing from read-only to 197 * read/write; if there is no device name, that's all we do. 198 */ 199 if (mp->mnt_flag & MNT_UPDATE) { 200 ump = VFSTOUFS(mp); 201 fs = ump->um_fs; 202 if (fs->fs_ronly == 0 && (mp->mnt_flag & MNT_RDONLY)) { 203 flags = WRITECLOSE; 204 if (mp->mnt_flag & MNT_FORCE) 205 flags |= FORCECLOSE; 206 if (vfs_busy(mp)) 207 return (EBUSY); 208 error = ffs_flushfiles(mp, flags, p); 209 vfs_unbusy(mp); 210 if (error) 211 return (error); 212 } 213 if (fs->fs_ronly && (mp->mnt_flag & MNT_WANTRDWR)) 214 fs->fs_ronly = 0; 215 #ifdef EXPORTMFS 216 if (args.fspec == 0) 217 return (vfs_export(mp, &ump->um_export, &args.export)); 218 #endif 219 return (0); 220 } 221 error = getnewvnode(VT_MFS, (struct mount *)0, mfs_vnodeop_p, &devvp); 222 if (error) 223 return (error); 224 devvp->v_type = VBLK; 225 if (checkalias(devvp, makedev(255, mfs_minor++), (struct mount *)0)) 226 panic("mfs_mount: dup dev"); 227 mfsp = (struct mfsnode *)malloc(sizeof *mfsp, M_MFSNODE, M_WAITOK); 228 devvp->v_data = mfsp; 229 mfsp->mfs_baseoff = args.base; 230 mfsp->mfs_size = args.size; 231 mfsp->mfs_vnode = devvp; 232 mfsp->mfs_pid = p->p_pid; 233 mfsp->mfs_buflist = (struct buf *)0; 234 if (error = ffs_mountfs(devvp, mp, p)) { 235 mfsp->mfs_buflist = (struct buf *)-1; 236 vrele(devvp); 237 return (error); 238 } 239 ump = VFSTOUFS(mp); 240 fs = ump->um_fs; 241 (void) copyinstr(path, fs->fs_fsmnt, sizeof(fs->fs_fsmnt) - 1, &size); 242 bzero(fs->fs_fsmnt + size, sizeof(fs->fs_fsmnt) - size); 243 bcopy(fs->fs_fsmnt, mp->mnt_stat.f_mntonname, MNAMELEN); 244 (void) copyinstr(args.fspec, mp->mnt_stat.f_mntfromname, MNAMELEN - 1, 245 &size); 246 bzero(mp->mnt_stat.f_mntfromname + size, MNAMELEN - size); 247 return (0); 248 } 249 250 int mfs_pri = PWAIT | PCATCH; /* XXX prob. temp */ 251 252 /* 253 * Used to grab the process and keep it in the kernel to service 254 * memory filesystem I/O requests. 255 * 256 * Loop servicing I/O requests. 257 * Copy the requested data into or out of the memory filesystem 258 * address space. 259 */ 260 /* ARGSUSED */ 261 int 262 mfs_start(mp, flags, p) 263 struct mount *mp; 264 int flags; 265 struct proc *p; 266 { 267 register struct vnode *vp = VFSTOUFS(mp)->um_devvp; 268 register struct mfsnode *mfsp = VTOMFS(vp); 269 register struct buf *bp; 270 register caddr_t base; 271 int error = 0; 272 273 base = mfsp->mfs_baseoff; 274 while (mfsp->mfs_buflist != (struct buf *)-1) { 275 #define DOIO() \ 276 while (bp = mfsp->mfs_buflist) { \ 277 mfsp->mfs_buflist = bp->b_actf; \ 278 mfs_doio(bp, base); \ 279 wakeup((caddr_t)bp); \ 280 } 281 DOIO(); 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 DOIO(); 290 if (dounmount(mp, 0, p) != 0) 291 CLRSIG(p, CURSIG(p)); 292 } 293 } 294 return (error); 295 } 296 297 /* 298 * Get file system statistics. 299 */ 300 mfs_statfs(mp, sbp, p) 301 struct mount *mp; 302 struct statfs *sbp; 303 struct proc *p; 304 { 305 int error; 306 307 error = ffs_statfs(mp, sbp, p); 308 #ifdef COMPAT_09 309 sbp->f_type = 3; 310 #else 311 sbp->f_type = 0; 312 #endif 313 strncpy(&sbp->f_fstypename[0], mp->mnt_op->vfs_name, MFSNAMELEN); 314 return (error); 315 } 316
Indexes created Sat Sep 27 14:09:57 GMT 2025