Annotation of sys/ufs/mfs/mfs_vfsops.c, Revision 1.1
1.1 ! nbrk 1: /* $OpenBSD: mfs_vfsops.c,v 1.34 2006/06/25 15:01:54 sturm 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/quota.h>
! 48: #include <ufs/ufs/inode.h>
! 49: #include <ufs/ufs/ufsmount.h>
! 50: #include <ufs/ufs/ufs_extern.h>
! 51:
! 52: #include <ufs/ffs/fs.h>
! 53: #include <ufs/ffs/ffs_extern.h>
! 54:
! 55: #include <ufs/mfs/mfsnode.h>
! 56: #include <ufs/mfs/mfs_extern.h>
! 57:
! 58: caddr_t mfs_rootbase; /* address of mini-root in kernel virtual memory */
! 59: u_long mfs_rootsize; /* size of mini-root in bytes */
! 60:
! 61: static int mfs_minor; /* used for building internal dev_t */
! 62:
! 63: extern int (**mfs_vnodeop_p)(void *);
! 64:
! 65: /*
! 66: * mfs vfs operations.
! 67: */
! 68: const struct vfsops mfs_vfsops = {
! 69: mfs_mount,
! 70: mfs_start,
! 71: ffs_unmount,
! 72: ufs_root,
! 73: ufs_quotactl,
! 74: mfs_statfs,
! 75: ffs_sync,
! 76: ffs_vget,
! 77: ffs_fhtovp,
! 78: ffs_vptofh,
! 79: mfs_init,
! 80: ffs_sysctl,
! 81: mfs_checkexp
! 82: };
! 83:
! 84: /*
! 85: * Called by main() when mfs is going to be mounted as root.
! 86: */
! 87:
! 88: int
! 89: mfs_mountroot(void)
! 90: {
! 91: struct fs *fs;
! 92: struct mount *mp;
! 93: struct proc *p = curproc;
! 94: struct ufsmount *ump;
! 95: struct mfsnode *mfsp;
! 96: int error;
! 97:
! 98: if ((error = bdevvp(swapdev, &swapdev_vp)) ||
! 99: (error = bdevvp(rootdev, &rootvp))) {
! 100: printf("mfs_mountroot: can't setup bdevvp's");
! 101: return (error);
! 102: }
! 103: if ((error = vfs_rootmountalloc("mfs", "mfs_root", &mp)) != 0)
! 104: return (error);
! 105: mfsp = malloc(sizeof *mfsp, M_MFSNODE, M_WAITOK);
! 106: rootvp->v_data = mfsp;
! 107: rootvp->v_op = mfs_vnodeop_p;
! 108: rootvp->v_tag = VT_MFS;
! 109: mfsp->mfs_baseoff = mfs_rootbase;
! 110: mfsp->mfs_size = mfs_rootsize;
! 111: mfsp->mfs_vnode = rootvp;
! 112: mfsp->mfs_pid = p->p_pid;
! 113: mfsp->mfs_buflist = (struct buf *)0;
! 114: if ((error = ffs_mountfs(rootvp, mp, p)) != 0) {
! 115: mp->mnt_vfc->vfc_refcount--;
! 116: vfs_unbusy(mp);
! 117: free(mp, M_MOUNT);
! 118: free(mfsp, M_MFSNODE);
! 119: return (error);
! 120: }
! 121:
! 122: CIRCLEQ_INSERT_TAIL(&mountlist, mp, mnt_list);
! 123: ump = VFSTOUFS(mp);
! 124: fs = ump->um_fs;
! 125: (void) copystr(mp->mnt_stat.f_mntonname, fs->fs_fsmnt, MNAMELEN - 1, 0);
! 126: (void)ffs_statfs(mp, &mp->mnt_stat, p);
! 127: vfs_unbusy(mp);
! 128: inittodr((time_t)0);
! 129:
! 130: return (0);
! 131: }
! 132:
! 133: /*
! 134: * This is called early in boot to set the base address and size
! 135: * of the mini-root.
! 136: */
! 137: int
! 138: mfs_initminiroot(caddr_t base)
! 139: {
! 140: struct fs *fs = (struct fs *)(base + SBOFF);
! 141: extern int (*mountroot)(void);
! 142:
! 143: /* check for valid super block */
! 144: if (fs->fs_magic != FS_MAGIC || fs->fs_bsize > MAXBSIZE ||
! 145: fs->fs_bsize < sizeof(struct fs))
! 146: return (0);
! 147: mountroot = mfs_mountroot;
! 148: mfs_rootbase = base;
! 149: mfs_rootsize = fs->fs_fsize * fs->fs_size;
! 150: rootdev = makedev(255, mfs_minor);
! 151: mfs_minor++;
! 152: return (mfs_rootsize);
! 153: }
! 154:
! 155: /*
! 156: * VFS Operations.
! 157: *
! 158: * mount system call
! 159: */
! 160: /* ARGSUSED */
! 161: int
! 162: mfs_mount(struct mount *mp, const char *path, void *data,
! 163: struct nameidata *ndp, struct proc *p)
! 164: {
! 165: struct vnode *devvp;
! 166: struct mfs_args args;
! 167: struct ufsmount *ump;
! 168: struct fs *fs;
! 169: struct mfsnode *mfsp;
! 170: size_t size;
! 171: int flags, error;
! 172:
! 173: error = copyin(data, (caddr_t)&args, sizeof (struct mfs_args));
! 174: if (error)
! 175: return (error);
! 176:
! 177: /*
! 178: * If updating, check whether changing from read-only to
! 179: * read/write; if there is no device name, that's all we do.
! 180: */
! 181: if (mp->mnt_flag & MNT_UPDATE) {
! 182: ump = VFSTOUFS(mp);
! 183: fs = ump->um_fs;
! 184: if (fs->fs_ronly == 0 && (mp->mnt_flag & MNT_RDONLY)) {
! 185: flags = WRITECLOSE;
! 186: if (mp->mnt_flag & MNT_FORCE)
! 187: flags |= FORCECLOSE;
! 188: error = ffs_flushfiles(mp, flags, p);
! 189: if (error)
! 190: return (error);
! 191: }
! 192: if (fs->fs_ronly && (mp->mnt_flag & MNT_WANTRDWR))
! 193: fs->fs_ronly = 0;
! 194: #ifdef EXPORTMFS
! 195: if (args.fspec == 0)
! 196: return (vfs_export(mp, &ump->um_export,
! 197: &args.export_info));
! 198: #endif
! 199: return (0);
! 200: }
! 201: error = getnewvnode(VT_MFS, (struct mount *)0, mfs_vnodeop_p, &devvp);
! 202: if (error)
! 203: return (error);
! 204: devvp->v_type = VBLK;
! 205: if (checkalias(devvp, makedev(255, mfs_minor), (struct mount *)0))
! 206: panic("mfs_mount: dup dev");
! 207: mfs_minor++;
! 208: mfsp = malloc(sizeof *mfsp, M_MFSNODE, M_WAITOK);
! 209: devvp->v_data = mfsp;
! 210: mfsp->mfs_baseoff = args.base;
! 211: mfsp->mfs_size = args.size;
! 212: mfsp->mfs_vnode = devvp;
! 213: mfsp->mfs_pid = p->p_pid;
! 214: mfsp->mfs_buflist = (struct buf *)0;
! 215: if ((error = ffs_mountfs(devvp, mp, p)) != 0) {
! 216: mfsp->mfs_buflist = (struct buf *)-1;
! 217: vrele(devvp);
! 218: return (error);
! 219: }
! 220: ump = VFSTOUFS(mp);
! 221: fs = ump->um_fs;
! 222: (void) copyinstr(path, fs->fs_fsmnt, sizeof(fs->fs_fsmnt) - 1, &size);
! 223: bzero(fs->fs_fsmnt + size, sizeof(fs->fs_fsmnt) - size);
! 224: bcopy(fs->fs_fsmnt, mp->mnt_stat.f_mntonname, MNAMELEN);
! 225: (void) copyinstr(args.fspec, mp->mnt_stat.f_mntfromname, MNAMELEN - 1,
! 226: &size);
! 227: bzero(mp->mnt_stat.f_mntfromname + size, MNAMELEN - size);
! 228: bcopy(&args, &mp->mnt_stat.mount_info.mfs_args, sizeof(args));
! 229: return (0);
! 230: }
! 231:
! 232: int mfs_pri = PWAIT | PCATCH; /* XXX prob. temp */
! 233:
! 234: /*
! 235: * Used to grab the process and keep it in the kernel to service
! 236: * memory filesystem I/O requests.
! 237: *
! 238: * Loop servicing I/O requests.
! 239: * Copy the requested data into or out of the memory filesystem
! 240: * address space.
! 241: */
! 242: /* ARGSUSED */
! 243: int
! 244: mfs_start(struct mount *mp, int flags, struct proc *p)
! 245: {
! 246: struct vnode *vp = VFSTOUFS(mp)->um_devvp;
! 247: struct mfsnode *mfsp = VTOMFS(vp);
! 248: struct buf *bp;
! 249: caddr_t base;
! 250: int sleepreturn = 0;
! 251:
! 252: base = mfsp->mfs_baseoff;
! 253: while (mfsp->mfs_buflist != (struct buf *)-1) {
! 254: while ((bp = mfsp->mfs_buflist) != NULL) {
! 255: mfsp->mfs_buflist = bp->b_actf;
! 256: mfs_doio(bp, base);
! 257: wakeup((caddr_t)bp);
! 258: }
! 259: /*
! 260: * If a non-ignored signal is received, try to unmount.
! 261: * If that fails, clear the signal (it has been "processed"),
! 262: * otherwise we will loop here, as tsleep will always return
! 263: * EINTR/ERESTART.
! 264: */
! 265: if (sleepreturn != 0) {
! 266: if (vfs_busy(mp, VB_WRITE|VB_NOWAIT) ||
! 267: dounmount(mp, 0, p, NULL))
! 268: CLRSIG(p, CURSIG(p));
! 269: sleepreturn = 0;
! 270: continue;
! 271: }
! 272: sleepreturn = tsleep((caddr_t)vp, mfs_pri, "mfsidl", 0);
! 273: }
! 274: return (0);
! 275: }
! 276:
! 277: /*
! 278: * Get file system statistics.
! 279: */
! 280: int
! 281: mfs_statfs(struct mount *mp, struct statfs *sbp, struct proc *p)
! 282: {
! 283: int error;
! 284:
! 285: error = ffs_statfs(mp, sbp, p);
! 286: strncpy(&sbp->f_fstypename[0], mp->mnt_vfc->vfc_name, MFSNAMELEN);
! 287: if (sbp != &mp->mnt_stat)
! 288: bcopy(&mp->mnt_stat.mount_info.mfs_args,
! 289: &sbp->mount_info.mfs_args, sizeof(struct mfs_args));
! 290: return (error);
! 291: }
! 292:
! 293: /*
! 294: * check export permission, not supported
! 295: */
! 296: /* ARGUSED */
! 297: int
! 298: mfs_checkexp(struct mount *mp, struct mbuf *nam, int *exflagsp,
! 299: struct ucred **credanonp)
! 300: {
! 301: return (EOPNOTSUPP);
! 302: }
! 303:
! 304: /*
! 305: * Memory based filesystem initialization.
! 306: */
! 307: int
! 308: mfs_init(struct vfsconf *vfsp)
! 309: {
! 310: return (ffs_init(vfsp));
! 311: }
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