/* $NetBSD: coda_vfsops.c,v 1.90 2022/03/28 12:37:46 riastradh Exp $ */ /* * * 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. * * @(#) cfs/coda_vfsops.c,v 1.1.1.1 1998/08/29 21:26:45 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 file system at Carnegie Mellon * University. Contributers include David Steere, James Kistler, and * M. Satyanarayanan. */ #include __KERNEL_RCSID(0, "$NetBSD: coda_vfsops.c,v 1.90 2022/03/28 12:37:46 riastradh Exp $"); #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include /* for VN_RDEV */ #include #include MODULE(MODULE_CLASS_VFS, coda, "vcoda"); #define ENTRY if(coda_vfsop_print_entry) myprintf(("Entered %s\n",__func__)) extern struct vnode *coda_ctlvp; extern struct coda_mntinfo coda_mnttbl[NVCODA]; /* indexed by minor device number */ /* 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 MRAK_INT_GEN(op) (coda_vfsopstats[op].gen_intrn++) extern const struct cdevsw vcoda_cdevsw; extern const struct vnodeopv_desc coda_vnodeop_opv_desc; const struct vnodeopv_desc * const coda_vnodeopv_descs[] = { &coda_vnodeop_opv_desc, NULL, }; struct vfsops coda_vfsops = { .vfs_name = MOUNT_CODA, .vfs_min_mount_data = 256, /* This is the pathname, unlike every other fs */ .vfs_mount = coda_mount, .vfs_start = coda_start, .vfs_unmount = coda_unmount, .vfs_root = coda_root, .vfs_quotactl = (void *)eopnotsupp, .vfs_statvfs = coda_nb_statvfs, .vfs_sync = coda_sync, .vfs_vget = coda_vget, .vfs_loadvnode = coda_loadvnode, .vfs_fhtovp = (void *)eopnotsupp, .vfs_vptofh = (void *)eopnotsupp, .vfs_init = coda_init, .vfs_done = coda_done, .vfs_mountroot = (void *)eopnotsupp, .vfs_snapshot = (void *)eopnotsupp, .vfs_extattrctl = vfs_stdextattrctl, .vfs_suspendctl = genfs_suspendctl, .vfs_renamelock_enter = genfs_renamelock_enter, .vfs_renamelock_exit = genfs_renamelock_exit, .vfs_fsync = (void *)eopnotsupp, .vfs_opv_descs = coda_vnodeopv_descs }; static int coda_modcmd(modcmd_t cmd, void *arg) { switch (cmd) { case MODULE_CMD_INIT: return vfs_attach(&coda_vfsops); case MODULE_CMD_FINI: return vfs_detach(&coda_vfsops); default: return ENOTTY; } } int coda_vfsopstats_init(void) { int i; for (i=0;imnt_flag & MNT_GETARGS) return EINVAL; ENTRY; 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(). */ /* * XXX: coda passes the mount device as the entire mount args, * All other fs pass a structure contining a pointer. * In order to get sys_mount() to do the copyin() we've set a * fixed default size for the filename buffer. */ /* Ensure that namei() doesn't run off the filename buffer */ if (*data_len < 1 || *data_len > PATH_MAX || strnlen(data, *data_len) >= *data_len) { MARK_INT_FAIL(CODA_MOUNT_STATS); return EINVAL; } error = namei_simple_kernel((char *)data, NSM_FOLLOW_NOEMULROOT, &dvp); if (error) { MARK_INT_FAIL(CODA_MOUNT_STATS); return (error); } if (dvp->v_type != VCHR) { MARK_INT_FAIL(CODA_MOUNT_STATS); vrele(dvp); return(ENXIO); } dev = dvp->v_rdev; vrele(dvp); cdev = cdevsw_lookup(dev); if (cdev == NULL) { MARK_INT_FAIL(CODA_MOUNT_STATS); return(ENXIO); } /* * See if the device table matches our expectations. */ if (cdev != &vcoda_cdevsw) { MARK_INT_FAIL(CODA_MOUNT_STATS); return(ENXIO); } if (minor(dev) >= NVCODA) { MARK_INT_FAIL(CODA_MOUNT_STATS); return(ENXIO); } /* * Initialize the mount record and link it to the vfs struct */ mi = &coda_mnttbl[minor(dev)]; if (!VC_OPEN(&mi->mi_vcomm)) { MARK_INT_FAIL(CODA_MOUNT_STATS); return(ENODEV); } /* No initialization (here) of mi_vcomm! */ vfsp->mnt_data = mi; vfsp->mnt_stat.f_fsidx.__fsid_val[0] = 0; vfsp->mnt_stat.f_fsidx.__fsid_val[1] = makefstype(MOUNT_CODA); vfsp->mnt_stat.f_fsid = vfsp->mnt_stat.f_fsidx.__fsid_val[0]; vfsp->mnt_stat.f_namemax = CODA_MAXNAMLEN; mi->mi_vfsp = vfsp; /* * 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); rtvp = CTOV(cp); rtvp->v_vflag |= VV_ROOT; cp = make_coda_node(&ctlfid, vfsp, VCHR); coda_ctlvp = CTOV(cp); /* Add vfs and rootvp to chain of vfs hanging off mntinfo */ mi->mi_vfsp = vfsp; mi->mi_rootvp = rtvp; /* set filesystem block size */ vfsp->mnt_stat.f_bsize = 8192; /* XXX -JJK */ vfsp->mnt_stat.f_frsize = 8192; /* XXX -JJK */ /* error is currently guaranteed to be zero, but in case some code changes... */ CODADEBUG(1, myprintf(("coda_mount returned %d\n",error));); if (error) MARK_INT_FAIL(CODA_MOUNT_STATS); else MARK_INT_SAT(CODA_MOUNT_STATS); return set_statvfs_info("/coda", UIO_SYSSPACE, "CODA", UIO_SYSSPACE, vfsp->mnt_op->vfs_name, vfsp, l); } int coda_start(struct mount *vfsp, int flags) { ENTRY; vftomi(vfsp)->mi_started = 1; return (0); } int coda_unmount(struct mount *vfsp, int mntflags) { 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 mi->mi_started = 0; vrele(mi->mi_rootvp); vrele(coda_ctlvp); active = coda_kill(vfsp, NOT_DOWNCALL); mi->mi_rootvp->v_vflag &= ~VV_ROOT; error = vflush(mi->mi_vfsp, NULLVP, FORCECLOSE); printf("coda_unmount: active = %d, vflush active %d\n", active, error); 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(struct mount *vfsp, int lktype, struct vnode **vpp) { struct coda_mntinfo *mi = vftomi(vfsp); int error; struct lwp *l = curlwp; /* XXX - bnoble */ CodaFid VFid; static const CodaFid invalfid = INVAL_FID; ENTRY; MARK_ENTRY(CODA_ROOT_STATS); if (vfsp == mi->mi_vfsp) { if (memcmp(&VTOC(mi->mi_rootvp)->c_fid, &invalfid, sizeof(CodaFid))) { /* Found valid root. */ *vpp = mi->mi_rootvp; /* On Mach, this is vref. On NetBSD, VOP_LOCK */ vref(*vpp); vn_lock(*vpp, lktype); MARK_INT_SAT(CODA_ROOT_STATS); return(0); } } error = venus_root(vftomi(vfsp), l->l_cred, l->l_proc, &VFid); if (!error) { struct cnode *cp = VTOC(mi->mi_rootvp); /* * Save the new rootfid in the cnode, and rekey the cnode * with the new fid key. */ error = vcache_rekey_enter(vfsp, mi->mi_rootvp, &invalfid, sizeof(CodaFid), &VFid, sizeof(CodaFid)); if (error) goto exit; cp->c_fid = VFid; vcache_rekey_exit(vfsp, mi->mi_rootvp, &invalfid, sizeof(CodaFid), &cp->c_fid, sizeof(CodaFid)); *vpp = mi->mi_rootvp; vref(*vpp); vn_lock(*vpp, lktype); 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; vref(*vpp); vn_lock(*vpp, lktype); 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 file system statistics. */ int coda_nb_statvfs(struct mount *vfsp, struct statvfs *sbp) { struct lwp *l = curlwp; struct coda_statfs fsstat; int error; ENTRY; MARK_ENTRY(CODA_STATFS_STATS); if (!CODA_MOUNTED(vfsp)) { /* MARK_INT_FAIL(CODA_STATFS_STATS); */ return(EINVAL); } /* 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 */ error = venus_statfs(vftomi(vfsp), l->l_cred, l, &fsstat); if (!error) { sbp->f_bsize = 8192; /* XXX */ sbp->f_frsize = 8192; /* XXX */ sbp->f_iosize = 8192; /* XXX */ sbp->f_blocks = fsstat.f_blocks; sbp->f_bfree = fsstat.f_bfree; sbp->f_bavail = fsstat.f_bavail; sbp->f_bresvd = 0; sbp->f_files = fsstat.f_files; sbp->f_ffree = fsstat.f_ffree; sbp->f_favail = fsstat.f_ffree; sbp->f_fresvd = 0; copy_statvfs_info(sbp, vfsp); } MARK_INT_SAT(CODA_STATFS_STATS); return(error); } /* * Flush any pending I/O. */ int coda_sync(struct mount *vfsp, int waitfor, kauth_cred_t cred) { ENTRY; MARK_ENTRY(CODA_SYNC_STATS); MARK_INT_SAT(CODA_SYNC_STATS); return(0); } int coda_vget(struct mount *vfsp, ino_t ino, int lktype, struct vnode **vpp) { ENTRY; return (EOPNOTSUPP); } int coda_loadvnode(struct mount *mp, struct vnode *vp, const void *key, size_t key_len, const void **new_key) { CodaFid fid; struct cnode *cp; extern int (**coda_vnodeop_p)(void *); KASSERT(key_len == sizeof(CodaFid)); memcpy(&fid, key, key_len); cp = kmem_zalloc(sizeof(*cp), KM_SLEEP); mutex_init(&cp->c_lock, MUTEX_DEFAULT, IPL_NONE); cp->c_fid = fid; cp->c_vnode = vp; vp->v_op = coda_vnodeop_p; vp->v_tag = VT_CODA; vp->v_type = VNON; vp->v_data = cp; *new_key = &cp->c_fid; 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(struct mount *vfsp, struct fid *fhp, struct mbuf *nam, struct vnode **vpp, int *exflagsp, kauth_cred_t *creadanonp, int lktype) { struct cfid *cfid = (struct cfid *)fhp; struct cnode *cp = 0; int error; struct lwp *l = curlwp; /* XXX -mach */ 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, l->l_cred, l->l_proc, &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); } int coda_vptofh(struct vnode *vnp, struct fid *fidp) { ENTRY; return (EOPNOTSUPP); } void coda_init(void) { ENTRY; } void coda_done(void) { ENTRY; } SYSCTL_SETUP(sysctl_vfs_coda_setup, "sysctl vfs.coda subtree setup") { sysctl_createv(clog, 0, NULL, NULL, CTLFLAG_PERMANENT, CTLTYPE_NODE, "coda", SYSCTL_DESCR("code vfs options"), NULL, 0, NULL, 0, CTL_VFS, 18, CTL_EOL); /* * XXX the "18" above could be dynamic, thereby eliminating * one more instance of the "number to vfs" mapping problem, * but "18" is the order as taken from sys/mount.h */ /* sysctl_createv(clog, 0, NULL, NULL, CTLFLAG_PERMANENT|CTLFLAG_READWRITE, CTLTYPE_INT, "clusterread", SYSCTL_DESCR( anyone? ), NULL, 0, &doclusterread, 0, CTL_VFS, 18, FFS_CLUSTERREAD, CTL_EOL); */ } /* * 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 orphan-ness. So this function will * get a new vnode for the file from the current run of Venus. */ int getNewVnode(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, LK_EXCLUSIVE); } /* Get the mount structure corresponding to a given device. * Return NULL if no device is found or the device is not mounted. */ struct mount *devtomp(dev_t dev) { struct mount *mp; struct vnode *vp; if (spec_node_lookup_by_dev(VBLK, dev, VDEAD_NOWAIT, &vp) == 0) { mp = spec_node_getmountedfs(vp); vrele(vp); } else { mp = NULL; } return mp; }