mfs_vfsops.c revision 1.32.2.1
1 /* $NetBSD: mfs_vfsops.c,v 1.32.2.1 2001/03/05 22:50:08 nathanw 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/lwp.h> 47 #include <sys/proc.h> 48 #include <sys/buf.h> 49 #include <sys/mount.h> 50 #include <sys/signalvar.h> 51 #include <sys/vnode.h> 52 #include <sys/malloc.h> 53 54 #include <ufs/ufs/quota.h> 55 #include <ufs/ufs/inode.h> 56 #include <ufs/ufs/ufsmount.h> 57 #include <ufs/ufs/ufs_extern.h> 58 59 #include <ufs/ffs/fs.h> 60 #include <ufs/ffs/ffs_extern.h> 61 62 #include <ufs/mfs/mfsnode.h> 63 #include <ufs/mfs/mfs_extern.h> 64 65 caddr_t mfs_rootbase; /* address of mini-root in kernel virtual memory */ 66 u_long mfs_rootsize; /* size of mini-root in bytes */ 67 68 static int mfs_minor; /* used for building internal dev_t */ 69 70 extern int (**mfs_vnodeop_p) __P((void *)); 71 72 /* 73 * mfs vfs operations. 74 */ 75 76 extern const struct vnodeopv_desc mfs_vnodeop_opv_desc; 77 78 const struct vnodeopv_desc * const mfs_vnodeopv_descs[] = { 79 &mfs_vnodeop_opv_desc, 80 NULL, 81 }; 82 83 struct vfsops mfs_vfsops = { 84 MOUNT_MFS, 85 mfs_mount, 86 mfs_start, 87 ffs_unmount, 88 ufs_root, 89 ufs_quotactl, 90 mfs_statfs, 91 ffs_sync, 92 ffs_vget, 93 ffs_fhtovp, 94 ffs_vptofh, 95 mfs_init, 96 mfs_done, 97 ffs_sysctl, 98 NULL, 99 ufs_check_export, 100 mfs_vnodeopv_descs, 101 }; 102 103 /* 104 * Memory based filesystem initialization. 105 */ 106 void 107 mfs_init() 108 { 109 /* 110 * ffs_init() ensures to initialize necessary resources 111 * only once. 112 */ 113 ffs_init(); 114 } 115 116 void 117 mfs_done() 118 { 119 /* 120 * ffs_done() ensures to free necessary resources 121 * only once, when it's no more needed. 122 */ 123 ffs_done(); 124 } 125 126 /* 127 * Called by main() when mfs is going to be mounted as root. 128 */ 129 130 int 131 mfs_mountroot() 132 { 133 struct fs *fs; 134 struct mount *mp; 135 struct proc *p = curproc->l_proc; /* XXX */ 136 struct ufsmount *ump; 137 struct mfsnode *mfsp; 138 int error = 0; 139 140 /* 141 * Get vnodes for rootdev. 142 */ 143 if (bdevvp(rootdev, &rootvp)) { 144 printf("mfs_mountroot: can't setup bdevvp's"); 145 return (error); 146 } 147 148 if ((error = vfs_rootmountalloc(MOUNT_MFS, "mfs_root", &mp))) { 149 vrele(rootvp); 150 return (error); 151 } 152 153 mfsp = malloc(sizeof *mfsp, M_MFSNODE, M_WAITOK); 154 rootvp->v_data = mfsp; 155 rootvp->v_op = mfs_vnodeop_p; 156 rootvp->v_tag = VT_MFS; 157 mfsp->mfs_baseoff = mfs_rootbase; 158 mfsp->mfs_size = mfs_rootsize; 159 mfsp->mfs_vnode = rootvp; 160 mfsp->mfs_proc = NULL; /* indicate kernel space */ 161 BUFQ_INIT(&mfsp->mfs_buflist); 162 if ((error = ffs_mountfs(rootvp, mp, p)) != 0) { 163 mp->mnt_op->vfs_refcount--; 164 vfs_unbusy(mp); 165 free(mp, M_MOUNT); 166 free(mfsp, M_MFSNODE); 167 vrele(rootvp); 168 return (error); 169 } 170 simple_lock(&mountlist_slock); 171 CIRCLEQ_INSERT_TAIL(&mountlist, mp, mnt_list); 172 simple_unlock(&mountlist_slock); 173 mp->mnt_vnodecovered = NULLVP; 174 ump = VFSTOUFS(mp); 175 fs = ump->um_fs; 176 (void) copystr(mp->mnt_stat.f_mntonname, fs->fs_fsmnt, MNAMELEN - 1, 0); 177 (void)ffs_statfs(mp, &mp->mnt_stat, p); 178 vfs_unbusy(mp); 179 inittodr((time_t)0); 180 return (0); 181 } 182 183 /* 184 * This is called early in boot to set the base address and size 185 * of the mini-root. 186 */ 187 int 188 mfs_initminiroot(base) 189 caddr_t base; 190 { 191 struct fs *fs = (struct fs *)(base + SBOFF); 192 extern int (*mountroot) __P((void)); 193 194 /* check for valid super block */ 195 if (fs->fs_magic != FS_MAGIC || fs->fs_bsize > MAXBSIZE || 196 fs->fs_bsize < sizeof(struct fs)) 197 return (0); 198 mountroot = mfs_mountroot; 199 mfs_rootbase = base; 200 mfs_rootsize = fs->fs_fsize * fs->fs_size; 201 rootdev = makedev(255, mfs_minor); 202 mfs_minor++; 203 return (mfs_rootsize); 204 } 205 206 /* 207 * VFS Operations. 208 * 209 * mount system call 210 */ 211 /* ARGSUSED */ 212 int 213 mfs_mount(mp, path, data, ndp, p) 214 struct mount *mp; 215 const char *path; 216 void *data; 217 struct nameidata *ndp; 218 struct proc *p; 219 { 220 struct vnode *devvp; 221 struct mfs_args args; 222 struct ufsmount *ump; 223 struct fs *fs; 224 struct mfsnode *mfsp; 225 size_t size; 226 int flags, error; 227 228 error = copyin(data, (caddr_t)&args, sizeof (struct mfs_args)); 229 if (error) 230 return (error); 231 232 /* 233 * If updating, check whether changing from read-only to 234 * read/write; if there is no device name, that's all we do. 235 */ 236 if (mp->mnt_flag & MNT_UPDATE) { 237 ump = VFSTOUFS(mp); 238 fs = ump->um_fs; 239 if (fs->fs_ronly == 0 && (mp->mnt_flag & MNT_RDONLY)) { 240 flags = WRITECLOSE; 241 if (mp->mnt_flag & MNT_FORCE) 242 flags |= FORCECLOSE; 243 error = ffs_flushfiles(mp, flags, p); 244 if (error) 245 return (error); 246 } 247 if (fs->fs_ronly && (mp->mnt_flag & MNT_WANTRDWR)) 248 fs->fs_ronly = 0; 249 if (args.fspec == 0) 250 return (vfs_export(mp, &ump->um_export, &args.export)); 251 return (0); 252 } 253 error = getnewvnode(VT_MFS, (struct mount *)0, mfs_vnodeop_p, &devvp); 254 if (error) 255 return (error); 256 devvp->v_type = VBLK; 257 if (checkalias(devvp, makedev(255, mfs_minor), (struct mount *)0)) 258 panic("mfs_mount: dup dev"); 259 mfs_minor++; 260 mfsp = (struct mfsnode *)malloc(sizeof *mfsp, M_MFSNODE, M_WAITOK); 261 devvp->v_data = mfsp; 262 mfsp->mfs_baseoff = args.base; 263 mfsp->mfs_size = args.size; 264 mfsp->mfs_vnode = devvp; 265 mfsp->mfs_proc = p; 266 BUFQ_INIT(&mfsp->mfs_buflist); 267 if ((error = ffs_mountfs(devvp, mp, p)) != 0) { 268 BUFQ_FIRST(&mfsp->mfs_buflist) = (struct buf *) -1; 269 vrele(devvp); 270 return (error); 271 } 272 ump = VFSTOUFS(mp); 273 fs = ump->um_fs; 274 (void) copyinstr(path, fs->fs_fsmnt, sizeof(fs->fs_fsmnt) - 1, &size); 275 memset(fs->fs_fsmnt + size, 0, sizeof(fs->fs_fsmnt) - size); 276 memcpy(mp->mnt_stat.f_mntonname, fs->fs_fsmnt, MNAMELEN); 277 (void) copyinstr(args.fspec, mp->mnt_stat.f_mntfromname, MNAMELEN - 1, 278 &size); 279 memset(mp->mnt_stat.f_mntfromname + size, 0, MNAMELEN - size); 280 return (0); 281 } 282 283 int mfs_pri = PWAIT | PCATCH; /* XXX prob. temp */ 284 285 /* 286 * Used to grab the process and keep it in the kernel to service 287 * memory filesystem I/O requests. 288 * 289 * Loop servicing I/O requests. 290 * Copy the requested data into or out of the memory filesystem 291 * address space. 292 */ 293 /* ARGSUSED */ 294 int 295 mfs_start(mp, flags, p) 296 struct mount *mp; 297 int flags; 298 struct proc *p; 299 { 300 struct vnode *vp = VFSTOUFS(mp)->um_devvp; 301 struct mfsnode *mfsp = VTOMFS(vp); 302 struct buf *bp; 303 caddr_t base; 304 int sleepreturn = 0; 305 struct lwp *l; /* XXX NJWLWP */ 306 307 /* XXX NJWLWP the vnode interface again gives us a proc in a 308 * place where we want a execution context. Cheat. 309 */ 310 KASSERT(curproc->l_proc == p); 311 l = curproc; 312 base = mfsp->mfs_baseoff; 313 while (BUFQ_FIRST(&mfsp->mfs_buflist) != (struct buf *) -1) { 314 while ((bp = BUFQ_FIRST(&mfsp->mfs_buflist)) != NULL) { 315 BUFQ_REMOVE(&mfsp->mfs_buflist, bp); 316 mfs_doio(bp, base); 317 wakeup((caddr_t)bp); 318 } 319 /* 320 * If a non-ignored signal is received, try to unmount. 321 * If that fails, or the filesystem is already in the 322 * process of being unmounted, clear the signal (it has been 323 * "processed"), otherwise we will loop here, as tsleep 324 * will always return EINTR/ERESTART. */ 325 if (sleepreturn != 0) { 326 if (vfs_busy(mp, LK_NOWAIT, 0) || 327 dounmount(mp, 0, p) != 0) 328 CLRSIG(p, CURSIG(l)); 329 sleepreturn = 0; 330 continue; 331 } 332 333 sleepreturn = tsleep(vp, mfs_pri, "mfsidl", 0); 334 } 335 return (sleepreturn); 336 } 337 338 /* 339 * Get file system statistics. 340 */ 341 int 342 mfs_statfs(mp, sbp, p) 343 struct mount *mp; 344 struct statfs *sbp; 345 struct proc *p; 346 { 347 int error; 348 349 error = ffs_statfs(mp, sbp, p); 350 #ifdef COMPAT_09 351 sbp->f_type = 3; 352 #else 353 sbp->f_type = 0; 354 #endif 355 strncpy(&sbp->f_fstypename[0], mp->mnt_op->vfs_name, MFSNAMELEN); 356 return (error); 357 } 358
Indexes created Tue Oct 21 16:10:11 GMT 2025