diff options
Diffstat (limited to 'sys/fs/coda/coda_vfsops.c')
-rw-r--r-- | sys/fs/coda/coda_vfsops.c | 542 |
1 files changed, 542 insertions, 0 deletions
diff --git a/sys/fs/coda/coda_vfsops.c b/sys/fs/coda/coda_vfsops.c new file mode 100644 index 0000000..7450c97 --- /dev/null +++ b/sys/fs/coda/coda_vfsops.c @@ -0,0 +1,542 @@ +/* + * + * 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 $ + * $FreeBSD$ + * + */ + +/* + * 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 <vcoda.h> + +#include <sys/param.h> +#include <sys/systm.h> +#include <sys/kernel.h> +#include <sys/proc.h> +#include <sys/malloc.h> +#include <sys/conf.h> +#include <sys/namei.h> +#include <sys/mount.h> +#include <sys/select.h> + +#include <vm/vm_zone.h> + +#include <coda/coda.h> +#include <coda/cnode.h> +#include <coda/coda_vfsops.h> +#include <coda/coda_venus.h> +#include <coda/coda_subr.h> +#include <coda/coda_opstats.h> + +MALLOC_DEFINE(M_CODA, "CODA storage", "Various Coda Structures"); + +int codadebug = 0; +int coda_vfsop_print_entry = 0; +#define ENTRY if(coda_vfsop_print_entry) myprintf(("Entered %s\n",__FUNCTION__)) + +struct vnode *coda_ctlvp; +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 int coda_nc_initialized; /* Set if cache has been initialized */ +extern int vc_nb_open __P((dev_t, int, int, struct proc *)); + +int +coda_vfsopstats_init(void) +{ + register int i; + + for (i=0;i<CODA_VFSOPS_SIZE;i++) { + coda_vfsopstats[i].opcode = i; + coda_vfsopstats[i].entries = 0; + coda_vfsopstats[i].sat_intrn = 0; + coda_vfsopstats[i].unsat_intrn = 0; + coda_vfsopstats[i].gen_intrn = 0; + } + + return 0; +} + +/* + * cfs mount vfsop + * Set up mount info record and attach it to vfs struct. + */ +/*ARGSUSED*/ +int +coda_mount(vfsp, path, data, ndp, p) + struct mount *vfsp; /* Allocated and initialized by mount(2) */ + char *path; /* path covered: ignored by the fs-layer */ + caddr_t data; /* Need to define a data type for this in netbsd? */ + struct nameidata *ndp; /* Clobber this to lookup the device name */ + struct proc *p; /* The ever-famous proc pointer */ +{ + struct vnode *dvp; + struct cnode *cp; + dev_t dev; + struct coda_mntinfo *mi; + struct vnode *rootvp; + ViceFid rootfid; + ViceFid ctlfid; + int error; + + 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(). */ + NDINIT(ndp, LOOKUP, FOLLOW, UIO_USERSPACE, data, p); + 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 (devsw(dev)->d_open != vc_nb_open) + { + MARK_INT_FAIL(CODA_MOUNT_STATS); + return(ENXIO); + } + + if (minor(dev) >= NVCODA || minor(dev) < 0) { + 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 = (qaddr_t)mi; + vfs_getnewfsid (vfsp); + + 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. + */ + rootfid.Volume = 0; + rootfid.Vnode = 0; + rootfid.Unique = 0; + cp = make_coda_node(&rootfid, vfsp, VDIR); + rootvp = CTOV(cp); + rootvp->v_flag |= VROOT; + + ctlfid.Volume = CTL_VOL; + ctlfid.Vnode = CTL_VNO; + ctlfid.Unique = CTL_UNI; +/* 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; + + /* set filesystem block size */ + vfsp->mnt_stat.f_bsize = 8192; /* XXX -JJK */ + + /* Set f_iosize. XXX -- inamura@isl.ntt.co.jp. + For vnode_pager_haspage() references. The value should be obtained + from underlying UFS. */ + /* Checked UFS. iosize is set as 8192 */ + vfsp->mnt_stat.f_iosize = 8192; + + /* 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(error); +} + +int +coda_unmount(vfsp, mntflags, p) + struct mount *vfsp; + int mntflags; + struct proc *p; +{ + 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); + mi->mi_rootvp->v_flag &= ~VROOT; + 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(vfsp, vpp) + struct mount *vfsp; + struct vnode **vpp; +{ + struct coda_mntinfo *mi = vftomi(vfsp); + struct vnode **result; + int error; + struct proc *p = curproc; /* XXX - bnoble */ + ViceFid VFid; + + ENTRY; + MARK_ENTRY(CODA_ROOT_STATS); + result = NULL; + + if (vfsp == mi->mi_vfsp) { + if ((VTOC(mi->mi_rootvp)->c_fid.Volume != 0) || + (VTOC(mi->mi_rootvp)->c_fid.Vnode != 0) || + (VTOC(mi->mi_rootvp)->c_fid.Unique != 0)) + { /* Found valid root. */ + *vpp = mi->mi_rootvp; + /* On Mach, this is vref. On NetBSD, VOP_LOCK */ +#if 1 + vref(*vpp); + vn_lock(*vpp, LK_EXCLUSIVE, p); +#else + vget(*vpp, LK_EXCLUSIVE, p); +#endif + MARK_INT_SAT(CODA_ROOT_STATS); + return(0); + } + } + + error = venus_root(vftomi(vfsp), p->p_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, p); +#else + vget(*vpp, LK_EXCLUSIVE, p); +#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, p); +#else + vget(*vpp, LK_EXCLUSIVE, p); +#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 file system statistics. + */ +int +coda_nb_statfs(vfsp, sbp, p) + register struct mount *vfsp; + struct statfs *sbp; + struct proc *p; +{ + 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_mntfromname, sizeof(sbp->f_mntfromname), "CODA"); +/* MARK_INT_SAT(CODA_STATFS_STATS); */ + return(0); +} + +/* + * Flush any pending I/O. + */ +int +coda_sync(vfsp, waitfor, cred, p) + struct mount *vfsp; + int waitfor; + struct ucred *cred; + struct proc *p; +{ + 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 proc *p = curproc; /* XXX -mach */ + ViceFid 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, p->p_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: vol %lx vno %lx uni %lx type %d result %d\n", + VFid.Volume, VFid.Vnode, VFid.Unique, 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(ViceFid); + 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 <ufs/ufs/quota.h> +#include <ufs/ufs/ufsmount.h> +/* 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) + dev_t 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 = { + coda_mount, + vfs_stdstart, + coda_unmount, + coda_root, + vfs_stdquotactl, + coda_nb_statfs, + coda_sync, + vfs_stdvget, + vfs_stdfhtovp, + vfs_stdcheckexp, + vfs_stdvptofh, + vfs_stdinit, + vfs_stduninit, + vfs_stdextattrctl, +}; + +VFS_SET(coda_vfsops, coda, VFCF_NETWORK); |