1 /* $OpenBSD: mfs_vfsops.c,v 1.26 2003/08/14 07:46:40 mickey Exp $ */ 2 /* $NetBSD: mfs_vfsops.c,v 1.10 1996/02/09 22:31:28 christos Exp $ */ 3 4 /* 5 * Copyright (c) 1989, 1990, 1993, 1994 6 * The Regents of the University of California. All rights reserved. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 3. Neither the name of the University nor the names of its contributors 17 * may be used to endorse or promote products derived from this software 18 * without specific prior written permission. 19 * 20 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 23 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 30 * SUCH DAMAGE. 31 * 32 * @(#)mfs_vfsops.c 8.4 (Berkeley) 4/16/94 33 */ 34 35 #include <sys/param.h> 36 #include <sys/systm.h> 37 #include <sys/time.h> 38 #include <sys/kernel.h> 39 #include <sys/proc.h> 40 #include <sys/buf.h> 41 #include <sys/mount.h> 42 #include <sys/signalvar.h> 43 #include <sys/vnode.h> 44 #include <sys/malloc.h> 45 #include <sys/kthread.h> 46 47 #include <ufs/ufs/extattr.h> 48 #include <ufs/ufs/quota.h> 49 #include <ufs/ufs/inode.h> 50 #include <ufs/ufs/ufsmount.h> 51 #include <ufs/ufs/ufs_extern.h> 52 53 #include <ufs/ffs/fs.h> 54 #include <ufs/ffs/ffs_extern.h> 55 56 #include <ufs/mfs/mfsnode.h> 57 #include <ufs/mfs/mfs_extern.h> 58 59 caddr_t mfs_rootbase; /* address of mini-root in kernel virtual memory */ 60 u_long mfs_rootsize; /* size of mini-root in bytes */ 61 62 static int mfs_minor; /* used for building internal dev_t */ 63 64 extern int (**mfs_vnodeop_p)(void *); 65 66 /* 67 * mfs vfs operations. 68 */ 69 const struct vfsops mfs_vfsops = { 70 mfs_mount, 71 mfs_start, 72 ffs_unmount, 73 ufs_root, 74 ufs_quotactl, 75 mfs_statfs, 76 ffs_sync, 77 ffs_vget, 78 ffs_fhtovp, 79 ffs_vptofh, 80 mfs_init, 81 ffs_sysctl, 82 mfs_checkexp, 83 vfs_stdextattrctl 84 }; 85 86 /* 87 * Called by main() when mfs is going to be mounted as root. 88 */ 89 90 int 91 mfs_mountroot() 92 { 93 extern struct vnode *rootvp; 94 register struct fs *fs; 95 struct mount *mp; 96 struct proc *p = curproc; /* XXX */ 97 struct ufsmount *ump; 98 struct mfsnode *mfsp; 99 int error; 100 101 if ((error = bdevvp(swapdev, &swapdev_vp)) || 102 (error = bdevvp(rootdev, &rootvp))) { 103 printf("mfs_mountroot: can't setup bdevvp's"); 104 return (error); 105 } 106 if ((error = vfs_rootmountalloc("mfs", "mfs_root", &mp)) != 0) 107 return (error); 108 mfsp = malloc(sizeof *mfsp, M_MFSNODE, M_WAITOK); 109 rootvp->v_data = mfsp; 110 rootvp->v_op = mfs_vnodeop_p; 111 rootvp->v_tag = VT_MFS; 112 mfsp->mfs_baseoff = mfs_rootbase; 113 mfsp->mfs_size = mfs_rootsize; 114 mfsp->mfs_vnode = rootvp; 115 mfsp->mfs_pid = p->p_pid; 116 mfsp->mfs_buflist = (struct buf *)0; 117 if ((error = ffs_mountfs(rootvp, mp, p)) != 0) { 118 mp->mnt_vfc->vfc_refcount--; 119 vfs_unbusy(mp, p); 120 free(mp, M_MOUNT); 121 free(mfsp, M_MFSNODE); 122 return (error); 123 } 124 simple_lock(&mountlist_slock); 125 CIRCLEQ_INSERT_TAIL(&mountlist, mp, mnt_list); 126 simple_unlock(&mountlist_slock); 127 ump = VFSTOUFS(mp); 128 fs = ump->um_fs; 129 (void) copystr(mp->mnt_stat.f_mntonname, fs->fs_fsmnt, MNAMELEN - 1, 0); 130 (void)ffs_statfs(mp, &mp->mnt_stat, p); 131 vfs_unbusy(mp, p); 132 inittodr((time_t)0); 133 return (0); 134 } 135 136 /* 137 * This is called early in boot to set the base address and size 138 * of the mini-root. 139 */ 140 int 141 mfs_initminiroot(base) 142 caddr_t base; 143 { 144 struct fs *fs = (struct fs *)(base + SBOFF); 145 extern int (*mountroot)(void); 146 147 /* check for valid super block */ 148 if (fs->fs_magic != FS_MAGIC || fs->fs_bsize > MAXBSIZE || 149 fs->fs_bsize < sizeof(struct fs)) 150 return (0); 151 mountroot = mfs_mountroot; 152 mfs_rootbase = base; 153 mfs_rootsize = fs->fs_fsize * fs->fs_size; 154 rootdev = makedev(255, mfs_minor); 155 mfs_minor++; 156 return (mfs_rootsize); 157 } 158 159 /* 160 * VFS Operations. 161 * 162 * mount system call 163 */ 164 /* ARGSUSED */ 165 int 166 mfs_mount(mp, path, data, ndp, p) 167 register struct mount *mp; 168 const char *path; 169 void *data; 170 struct nameidata *ndp; 171 struct proc *p; 172 { 173 struct vnode *devvp; 174 struct mfs_args args; 175 struct ufsmount *ump; 176 register struct fs *fs; 177 register struct mfsnode *mfsp; 178 size_t size; 179 int flags, error; 180 181 error = copyin(data, (caddr_t)&args, sizeof (struct mfs_args)); 182 if (error) 183 return (error); 184 185 /* 186 * If updating, check whether changing from read-only to 187 * read/write; if there is no device name, that's all we do. 188 */ 189 if (mp->mnt_flag & MNT_UPDATE) { 190 ump = VFSTOUFS(mp); 191 fs = ump->um_fs; 192 if (fs->fs_ronly == 0 && (mp->mnt_flag & MNT_RDONLY)) { 193 flags = WRITECLOSE; 194 if (mp->mnt_flag & MNT_FORCE) 195 flags |= FORCECLOSE; 196 error = ffs_flushfiles(mp, flags, p); 197 if (error) 198 return (error); 199 } 200 if (fs->fs_ronly && (mp->mnt_flag & MNT_WANTRDWR)) 201 fs->fs_ronly = 0; 202 #ifdef EXPORTMFS 203 if (args.fspec == 0) 204 return (vfs_export(mp, &ump->um_export, 205 &args.export_info)); 206 #endif 207 return (0); 208 } 209 error = getnewvnode(VT_MFS, (struct mount *)0, mfs_vnodeop_p, &devvp); 210 if (error) 211 return (error); 212 devvp->v_type = VBLK; 213 if (checkalias(devvp, makedev(255, mfs_minor), (struct mount *)0)) 214 panic("mfs_mount: dup dev"); 215 mfs_minor++; 216 mfsp = malloc(sizeof *mfsp, M_MFSNODE, M_WAITOK); 217 devvp->v_data = mfsp; 218 mfsp->mfs_baseoff = args.base; 219 mfsp->mfs_size = args.size; 220 mfsp->mfs_vnode = devvp; 221 mfsp->mfs_pid = p->p_pid; 222 mfsp->mfs_buflist = (struct buf *)0; 223 if ((error = ffs_mountfs(devvp, mp, p)) != 0) { 224 mfsp->mfs_buflist = (struct buf *)-1; 225 vrele(devvp); 226 return (error); 227 } 228 ump = VFSTOUFS(mp); 229 fs = ump->um_fs; 230 (void) copyinstr(path, fs->fs_fsmnt, sizeof(fs->fs_fsmnt) - 1, &size); 231 bzero(fs->fs_fsmnt + size, sizeof(fs->fs_fsmnt) - size); 232 bcopy(fs->fs_fsmnt, mp->mnt_stat.f_mntonname, MNAMELEN); 233 (void) copyinstr(args.fspec, mp->mnt_stat.f_mntfromname, MNAMELEN - 1, 234 &size); 235 bzero(mp->mnt_stat.f_mntfromname + size, MNAMELEN - size); 236 bcopy(&args, &mp->mnt_stat.mount_info.mfs_args, sizeof(args)); 237 return (0); 238 } 239 240 int mfs_pri = PWAIT | PCATCH; /* XXX prob. temp */ 241 242 /* 243 * Used to grab the process and keep it in the kernel to service 244 * memory filesystem I/O requests. 245 * 246 * Loop servicing I/O requests. 247 * Copy the requested data into or out of the memory filesystem 248 * address space. 249 */ 250 /* ARGSUSED */ 251 int 252 mfs_start(mp, flags, p) 253 struct mount *mp; 254 int flags; 255 struct proc *p; 256 { 257 struct vnode *vp = VFSTOUFS(mp)->um_devvp; 258 struct mfsnode *mfsp = VTOMFS(vp); 259 struct buf *bp; 260 caddr_t base; 261 int sleepreturn = 0; 262 263 base = mfsp->mfs_baseoff; 264 while (mfsp->mfs_buflist != (struct buf *)-1) { 265 while ((bp = mfsp->mfs_buflist) != NULL) { 266 mfsp->mfs_buflist = bp->b_actf; 267 mfs_doio(bp, base); 268 wakeup((caddr_t)bp); 269 } 270 /* 271 * If a non-ignored signal is received, try to unmount. 272 * If that fails, clear the signal (it has been "processed"), 273 * otherwise we will loop here, as tsleep will always return 274 * EINTR/ERESTART. 275 */ 276 if (sleepreturn != 0) { 277 if (vfs_busy(mp, LK_EXCLUSIVE|LK_NOWAIT, NULL, p) || 278 dounmount(mp, 0, p, NULL)) 279 CLRSIG(p, CURSIG(p)); 280 sleepreturn = 0; 281 continue; 282 } 283 sleepreturn = tsleep((caddr_t)vp, mfs_pri, "mfsidl", 0); 284 } 285 return (0); 286 } 287 288 /* 289 * Get file system statistics. 290 */ 291 int 292 mfs_statfs(mp, sbp, p) 293 struct mount *mp; 294 struct statfs *sbp; 295 struct proc *p; 296 { 297 int error; 298 299 error = ffs_statfs(mp, sbp, p); 300 strncpy(&sbp->f_fstypename[0], mp->mnt_vfc->vfc_name, MFSNAMELEN); 301 if (sbp != &mp->mnt_stat) 302 bcopy(&mp->mnt_stat.mount_info.mfs_args, 303 &sbp->mount_info.mfs_args, sizeof(struct mfs_args)); 304 return (error); 305 } 306 307 /* 308 * check export permission, not supported 309 */ 310 /* ARGUSED */ 311 int 312 mfs_checkexp(mp, nam, exflagsp, credanonp) 313 register struct mount *mp; 314 struct mbuf *nam; 315 int *exflagsp; 316 struct ucred **credanonp; 317 { 318 return (EOPNOTSUPP); 319 } 320 321 /* 322 * Memory based filesystem initialization. 323 */ 324 int 325 mfs_init(vfsp) 326 struct vfsconf *vfsp; 327 { 328 return (ffs_init(vfsp)); 329 } 330