/*- * Coda: an Experimental Distributed File System * Release 3.1 * * Copyright (c) 1987-1998 Carnegie Mellon University * All Rights Reserved * * Permission to use, copy, modify and distribute this software and its * documentation is hereby granted, provided that both the copyright * notice and this permission notice appear in all copies of the * software, derivative works or modified versions, and any portions * thereof, and that both notices appear in supporting documentation, and * that credit is given to Carnegie Mellon University in all documents * and publicity pertaining to direct or indirect use of this code or its * derivatives. * * CODA IS AN EXPERIMENTAL SOFTWARE SYSTEM AND IS KNOWN TO HAVE BUGS, * SOME OF WHICH MAY HAVE SERIOUS CONSEQUENCES. CARNEGIE MELLON ALLOWS * FREE USE OF THIS SOFTWARE IN ITS "AS IS" CONDITION. CARNEGIE MELLON * DISCLAIMS ANY LIABILITY OF ANY KIND FOR ANY DAMAGES WHATSOEVER * RESULTING DIRECTLY OR INDIRECTLY FROM THE USE OF THIS SOFTWARE OR OF * ANY DERIVATIVE WORK. * * Carnegie Mellon encourages users of this software to return any * improvements or extensions that they make, and to grant Carnegie * Mellon the rights to redistribute these changes without encumbrance. * * @(#) src/sys/cfs/coda_vfsops.c,v 1.1.1.1 1998/08/29 21:14:52 rvb Exp $ */ /*- * Mach Operating System * Copyright (c) 1989 Carnegie-Mellon University * All rights reserved. The CMU software License Agreement specifies * the terms and conditions for use and redistribution. */ /* * This code was written for the Coda filesystem at Carnegie Mellon * University. Contributers include David Steere, James Kistler, and * M. Satyanarayanan. */ #include __FBSDID("$FreeBSD$"); #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include MALLOC_DEFINE(M_CODA, "coda", "Various Coda Structures"); int codadebug = 0; int coda_vfsop_print_entry = 0; #define ENTRY if(coda_vfsop_print_entry) myprintf(("Entered %s\n",__func__)) struct vnode *coda_ctlvp; /* structure to keep statistics of internally generated/satisfied calls */ struct coda_op_stats coda_vfsopstats[CODA_VFSOPS_SIZE]; #define MARK_ENTRY(op) (coda_vfsopstats[op].entries++) #define MARK_INT_SAT(op) (coda_vfsopstats[op].sat_intrn++) #define MARK_INT_FAIL(op) (coda_vfsopstats[op].unsat_intrn++) #define MARK_INT_GEN(op) (coda_vfsopstats[op].gen_intrn++) extern int coda_nc_initialized; /* Set if cache has been initialized */ extern int vc_nb_open(struct cdev *, int, int, struct thread *); int coda_vfsopstats_init(void) { register int i; for (i=0;imnt_optnew, coda_opts)) return (EINVAL); from = vfs_getopts(vfsp->mnt_optnew, "from", &error); if (error) return (error); coda_vfsopstats_init(); coda_vnodeopstats_init(); MARK_ENTRY(CODA_MOUNT_STATS); if (CODA_MOUNTED(vfsp)) { MARK_INT_FAIL(CODA_MOUNT_STATS); return(EBUSY); } /* Validate mount device. Similar to getmdev(). */ NDINIT(&ndp, LOOKUP, FOLLOW, UIO_SYSSPACE, from, td); error = namei(&ndp); dvp = ndp.ni_vp; if (error) { MARK_INT_FAIL(CODA_MOUNT_STATS); return (error); } if (dvp->v_type != VCHR) { MARK_INT_FAIL(CODA_MOUNT_STATS); vrele(dvp); NDFREE(&ndp, NDF_ONLY_PNBUF); return(ENXIO); } dev = dvp->v_rdev; vrele(dvp); NDFREE(&ndp, NDF_ONLY_PNBUF); /* * See if the device table matches our expectations. */ if (dev->si_devsw->d_open != vc_nb_open) { MARK_INT_FAIL(CODA_MOUNT_STATS); return(ENXIO); } /* * Initialize the mount record and link it to the vfs struct */ mi = dev2coda_mntinfo(dev); if (!VC_OPEN(&mi->mi_vcomm)) { MARK_INT_FAIL(CODA_MOUNT_STATS); return(ENODEV); } /* No initialization (here) of mi_vcomm! */ vfsp->mnt_data = (qaddr_t)mi; vfs_getnewfsid (vfsp); mi->mi_vfsp = vfsp; mi->mi_started = 0; /* XXX See coda_root() */ /* * Make a root vnode to placate the Vnode interface, but don't * actually make the CODA_ROOT call to venus until the first call * to coda_root in case a server is down while venus is starting. */ cp = make_coda_node(&rootfid, vfsp, VDIR); rootvp = CTOV(cp); rootvp->v_vflag |= VV_ROOT; /* cp = make_coda_node(&ctlfid, vfsp, VCHR); The above code seems to cause a loop in the cnode links. I don't totally understand when it happens, it is caught when closing down the system. */ cp = make_coda_node(&ctlfid, 0, VCHR); coda_ctlvp = CTOV(cp); /* Add vfs and rootvp to chain of vfs hanging off mntinfo */ mi->mi_vfsp = vfsp; mi->mi_rootvp = rootvp; vfs_mountedfrom(vfsp, from); /* error is currently guaranteed to be zero, but in case some code changes... */ CODADEBUG(1, myprintf(("coda_omount returned %d\n",error));); if (error) MARK_INT_FAIL(CODA_MOUNT_STATS); else MARK_INT_SAT(CODA_MOUNT_STATS); return(error); } int coda_unmount(vfsp, mntflags, td) struct mount *vfsp; int mntflags; struct thread *td; { struct coda_mntinfo *mi = vftomi(vfsp); int active, error = 0; ENTRY; MARK_ENTRY(CODA_UMOUNT_STATS); if (!CODA_MOUNTED(vfsp)) { MARK_INT_FAIL(CODA_UMOUNT_STATS); return(EINVAL); } if (mi->mi_vfsp == vfsp) { /* We found the victim */ if (!IS_UNMOUNTING(VTOC(mi->mi_rootvp))) return (EBUSY); /* Venus is still running */ #ifdef DEBUG printf("coda_unmount: ROOT: vp %p, cp %p\n", mi->mi_rootvp, VTOC(mi->mi_rootvp)); #endif vrele(mi->mi_rootvp); active = coda_kill(vfsp, NOT_DOWNCALL); ASSERT_VOP_LOCKED(mi->mi_rootvp, "coda_unmount"); mi->mi_rootvp->v_vflag &= ~VV_ROOT; error = vflush(mi->mi_vfsp, 0, FORCECLOSE, td); #ifdef CODA_VERBOSE printf("coda_unmount: active = %d, vflush active %d\n", active, error); #endif error = 0; /* I'm going to take this out to allow lookups to go through. I'm * not sure it's important anyway. -- DCS 2/2/94 */ /* vfsp->VFS_DATA = NULL; */ /* No more vfsp's to hold onto */ mi->mi_vfsp = NULL; mi->mi_rootvp = NULL; if (error) MARK_INT_FAIL(CODA_UMOUNT_STATS); else MARK_INT_SAT(CODA_UMOUNT_STATS); return(error); } return (EINVAL); } /* * find root of cfs */ int coda_root(vfsp, flags, vpp, td) struct mount *vfsp; int flags; struct vnode **vpp; struct thread *td; { struct coda_mntinfo *mi = vftomi(vfsp); struct vnode **result; int error; struct proc *p = td->td_proc; CodaFid VFid; static const CodaFid invalfid = INVAL_FID; ENTRY; MARK_ENTRY(CODA_ROOT_STATS); result = NULL; if (vfsp == mi->mi_vfsp) { /* * Cache the root across calls. We only need to pass the request * on to Venus if the root vnode is the dummy we installed in * coda_omount() with all c_fid members zeroed. * * XXX In addition, we assume that the first call to coda_root() * is from vfs_omount() * (before the call to checkdirs()) and return the dummy root * node to avoid a deadlock. This bug is fixed in the Coda CVS * repository but not in any released versions as of 6 Mar 2003. */ if (memcmp(&VTOC(mi->mi_rootvp)->c_fid, &invalfid, sizeof(CodaFid)) != 0 || mi->mi_started == 0) { /* Found valid root. */ *vpp = mi->mi_rootvp; mi->mi_started = 1; /* On Mach, this is vref. On NetBSD, VOP_LOCK */ #if 1 vref(*vpp); vn_lock(*vpp, LK_EXCLUSIVE, td); #else vget(*vpp, LK_EXCLUSIVE, td); #endif MARK_INT_SAT(CODA_ROOT_STATS); return(0); } } error = venus_root(vftomi(vfsp), td->td_ucred, p, &VFid); if (!error) { /* * Save the new rootfid in the cnode, and rehash the cnode into the * cnode hash with the new fid key. */ coda_unsave(VTOC(mi->mi_rootvp)); VTOC(mi->mi_rootvp)->c_fid = VFid; coda_save(VTOC(mi->mi_rootvp)); *vpp = mi->mi_rootvp; #if 1 vref(*vpp); vn_lock(*vpp, LK_EXCLUSIVE, td); #else vget(*vpp, LK_EXCLUSIVE, td); #endif MARK_INT_SAT(CODA_ROOT_STATS); goto exit; } else if (error == ENODEV || error == EINTR) { /* Gross hack here! */ /* * If Venus fails to respond to the CODA_ROOT call, coda_call returns * ENODEV. Return the uninitialized root vnode to allow vfs * operations such as unmount to continue. Without this hack, * there is no way to do an unmount if Venus dies before a * successful CODA_ROOT call is done. All vnode operations * will fail. */ *vpp = mi->mi_rootvp; #if 1 vref(*vpp); vn_lock(*vpp, LK_EXCLUSIVE, td); #else vget(*vpp, LK_EXCLUSIVE, td); #endif MARK_INT_FAIL(CODA_ROOT_STATS); error = 0; goto exit; } else { CODADEBUG( CODA_ROOT, myprintf(("error %d in CODA_ROOT\n", error)); ); MARK_INT_FAIL(CODA_ROOT_STATS); goto exit; } exit: return(error); } /* * Get filesystem statistics. */ int coda_nb_statfs(vfsp, sbp, td) register struct mount *vfsp; struct statfs *sbp; struct thread *td; { ENTRY; /* MARK_ENTRY(CODA_STATFS_STATS); */ if (!CODA_MOUNTED(vfsp)) { /* MARK_INT_FAIL(CODA_STATFS_STATS);*/ return(EINVAL); } bzero(sbp, sizeof(struct statfs)); /* XXX - what to do about f_flags, others? --bnoble */ /* Below This is what AFS does #define NB_SFS_SIZ 0x895440 */ /* Note: Normal fs's have a bsize of 0x400 == 1024 */ sbp->f_type = vfsp->mnt_vfc->vfc_typenum; sbp->f_bsize = 8192; /* XXX */ sbp->f_iosize = 8192; /* XXX */ #define NB_SFS_SIZ 0x8AB75D sbp->f_blocks = NB_SFS_SIZ; sbp->f_bfree = NB_SFS_SIZ; sbp->f_bavail = NB_SFS_SIZ; sbp->f_files = NB_SFS_SIZ; sbp->f_ffree = NB_SFS_SIZ; bcopy((caddr_t)&(vfsp->mnt_stat.f_fsid), (caddr_t)&(sbp->f_fsid), sizeof (fsid_t)); snprintf(sbp->f_mntonname, sizeof(sbp->f_mntonname), "/coda"); snprintf(sbp->f_fstypename, sizeof(sbp->f_fstypename), "coda"); /* MARK_INT_SAT(CODA_STATFS_STATS); */ return(0); } /* * Flush any pending I/O. */ int coda_sync(vfsp, waitfor, td) struct mount *vfsp; int waitfor; struct thread *td; { ENTRY; MARK_ENTRY(CODA_SYNC_STATS); MARK_INT_SAT(CODA_SYNC_STATS); return(0); } /* * fhtovp is now what vget used to be in 4.3-derived systems. For * some silly reason, vget is now keyed by a 32 bit ino_t, rather than * a type-specific fid. */ int coda_fhtovp(vfsp, fhp, nam, vpp, exflagsp, creadanonp) register struct mount *vfsp; struct fid *fhp; struct mbuf *nam; struct vnode **vpp; int *exflagsp; struct ucred **creadanonp; { struct cfid *cfid = (struct cfid *)fhp; struct cnode *cp = 0; int error; struct thread *td = curthread; /* XXX -mach */ struct proc *p = td->td_proc; CodaFid VFid; int vtype; ENTRY; MARK_ENTRY(CODA_VGET_STATS); /* Check for vget of control object. */ if (IS_CTL_FID(&cfid->cfid_fid)) { *vpp = coda_ctlvp; vref(coda_ctlvp); MARK_INT_SAT(CODA_VGET_STATS); return(0); } error = venus_fhtovp(vftomi(vfsp), &cfid->cfid_fid, td->td_ucred, p, &VFid, &vtype); if (error) { CODADEBUG(CODA_VGET, myprintf(("vget error %d\n",error));) *vpp = (struct vnode *)0; } else { CODADEBUG(CODA_VGET, myprintf(("vget: %s type %d result %d\n", coda_f2s(&VFid), vtype, error)); ) cp = make_coda_node(&VFid, vfsp, vtype); *vpp = CTOV(cp); } return(error); } /* * To allow for greater ease of use, some vnodes may be orphaned when * Venus dies. Certain operations should still be allowed to go * through, but without propagating ophan-ness. So this function will * get a new vnode for the file from the current run of Venus. */ int getNewVnode(vpp) struct vnode **vpp; { struct cfid cfid; struct coda_mntinfo *mi = vftomi((*vpp)->v_mount); ENTRY; cfid.cfid_len = (short)sizeof(CodaFid); cfid.cfid_fid = VTOC(*vpp)->c_fid; /* Structure assignment. */ /* XXX ? */ /* We're guessing that if set, the 1st element on the list is a * valid vnode to use. If not, return ENODEV as venus is dead. */ if (mi->mi_vfsp == NULL) return ENODEV; return coda_fhtovp(mi->mi_vfsp, (struct fid*)&cfid, NULL, vpp, NULL, NULL); } #include #include #include /* get the mount structure corresponding to a given device. Assume * device corresponds to a UFS. Return NULL if no device is found. */ struct mount *devtomp(dev) struct cdev *dev; { struct mount *mp; TAILQ_FOREACH(mp, &mountlist, mnt_list) { if (((VFSTOUFS(mp))->um_dev == dev)) { /* mount corresponds to UFS and the device matches one we want */ return(mp); } } /* mount structure wasn't found */ return(NULL); } struct vfsops coda_vfsops = { .vfs_mount = coda_mount, .vfs_root = coda_root, .vfs_statfs = coda_nb_statfs, .vfs_sync = coda_sync, .vfs_unmount = coda_unmount, }; VFS_SET(coda_vfsops, coda, VFCF_NETWORK);