/* $NetBSD: coda_vnops.c,v 1.64 2007/12/08 19:29:37 pooka 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. * * @(#) coda/coda_vnops.c,v 1.1.1.1 1998/08/29 21:26:46 rvb Exp $ */ /* * Mach Operating System * Copyright (c) 1990 Carnegie-Mellon University * 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_vnops.c,v 1.64 2007/12/08 19:29:37 pooka Exp $"); #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include /* * These flags select various performance enhancements. */ int coda_attr_cache = 1; /* Set to cache attributes in the kernel */ int coda_symlink_cache = 1; /* Set to cache symbolic link information */ int coda_access_cache = 1; /* Set to handle some access checks directly */ /* structure to keep track of vfs calls */ struct coda_op_stats coda_vnodeopstats[CODA_VNODEOPS_SIZE]; #define MARK_ENTRY(op) (coda_vnodeopstats[op].entries++) #define MARK_INT_SAT(op) (coda_vnodeopstats[op].sat_intrn++) #define MARK_INT_FAIL(op) (coda_vnodeopstats[op].unsat_intrn++) #define MARK_INT_GEN(op) (coda_vnodeopstats[op].gen_intrn++) /* What we are delaying for in printf */ int coda_printf_delay = 0; /* in microseconds */ int coda_vnop_print_entry = 0; static int coda_lockdebug = 0; #define ENTRY if(coda_vnop_print_entry) myprintf(("Entered %s\n",__func__)) /* Definition of the vnode operation vector */ const struct vnodeopv_entry_desc coda_vnodeop_entries[] = { { &vop_default_desc, coda_vop_error }, { &vop_lookup_desc, coda_lookup }, /* lookup */ { &vop_create_desc, coda_create }, /* create */ { &vop_mknod_desc, coda_vop_error }, /* mknod */ { &vop_open_desc, coda_open }, /* open */ { &vop_close_desc, coda_close }, /* close */ { &vop_access_desc, coda_access }, /* access */ { &vop_getattr_desc, coda_getattr }, /* getattr */ { &vop_setattr_desc, coda_setattr }, /* setattr */ { &vop_read_desc, coda_read }, /* read */ { &vop_write_desc, coda_write }, /* write */ { &vop_fcntl_desc, genfs_fcntl }, /* fcntl */ { &vop_ioctl_desc, coda_ioctl }, /* ioctl */ { &vop_mmap_desc, genfs_mmap }, /* mmap */ { &vop_fsync_desc, coda_fsync }, /* fsync */ { &vop_remove_desc, coda_remove }, /* remove */ { &vop_link_desc, coda_link }, /* link */ { &vop_rename_desc, coda_rename }, /* rename */ { &vop_mkdir_desc, coda_mkdir }, /* mkdir */ { &vop_rmdir_desc, coda_rmdir }, /* rmdir */ { &vop_symlink_desc, coda_symlink }, /* symlink */ { &vop_readdir_desc, coda_readdir }, /* readdir */ { &vop_readlink_desc, coda_readlink }, /* readlink */ { &vop_abortop_desc, coda_abortop }, /* abortop */ { &vop_inactive_desc, coda_inactive }, /* inactive */ { &vop_reclaim_desc, coda_reclaim }, /* reclaim */ { &vop_lock_desc, coda_lock }, /* lock */ { &vop_unlock_desc, coda_unlock }, /* unlock */ { &vop_bmap_desc, coda_bmap }, /* bmap */ { &vop_strategy_desc, coda_strategy }, /* strategy */ { &vop_print_desc, coda_vop_error }, /* print */ { &vop_islocked_desc, coda_islocked }, /* islocked */ { &vop_pathconf_desc, coda_vop_error }, /* pathconf */ { &vop_advlock_desc, coda_vop_nop }, /* advlock */ { &vop_bwrite_desc, coda_vop_error }, /* bwrite */ { &vop_lease_desc, coda_vop_nop }, /* lease */ { &vop_seek_desc, genfs_seek }, /* seek */ { &vop_poll_desc, genfs_poll }, /* poll */ { &vop_getpages_desc, coda_getpages }, /* getpages */ { &vop_putpages_desc, coda_putpages }, /* putpages */ { NULL, NULL } }; const struct vnodeopv_desc coda_vnodeop_opv_desc = { &coda_vnodeop_p, coda_vnodeop_entries }; /* Definitions of NetBSD vnodeop interfaces */ /* * A generic error routine. Return EIO without looking at arguments. */ int coda_vop_error(void *anon) { struct vnodeop_desc **desc = (struct vnodeop_desc **)anon; if (codadebug) { myprintf(("coda_vop_error: Vnode operation %s called (error).\n", (*desc)->vdesc_name)); } return EIO; } /* A generic do-nothing. For lease_check, advlock */ int coda_vop_nop(void *anon) { struct vnodeop_desc **desc = (struct vnodeop_desc **)anon; if (codadebug) { myprintf(("Vnode operation %s called, but unsupported\n", (*desc)->vdesc_name)); } return (0); } int coda_vnodeopstats_init(void) { int i; for(i=0;ia_vp; struct cnode *cp = VTOC(vp); int flag = ap->a_mode & (~O_EXCL); kauth_cred_t cred = ap->a_cred; /* locals */ int error; dev_t dev; /* container file device, inode, vnode */ ino_t inode; struct vnode *container_vp; MARK_ENTRY(CODA_OPEN_STATS); /* Check for open of control file. */ if (IS_CTL_VP(vp)) { /* if (WRITABLE(flag)) */ if (flag & (FWRITE | O_TRUNC | O_CREAT | O_EXCL)) { MARK_INT_FAIL(CODA_OPEN_STATS); return(EACCES); } MARK_INT_SAT(CODA_OPEN_STATS); return(0); } error = venus_open(vtomi(vp), &cp->c_fid, flag, cred, curlwp, &dev, &inode); if (error) return (error); if (!error) { CODADEBUG(CODA_OPEN, myprintf(("open: dev %d inode %llu result %d\n", dev, (unsigned long long)inode, error)); ) } /* * Obtain locked and referenced container vnode from container * device/inode. */ error = coda_grab_vnode(dev, inode, &container_vp); if (error) return (error); /* Save the vnode pointer for the container file. */ if (cp->c_ovp == NULL) { cp->c_ovp = container_vp; } else { if (cp->c_ovp != container_vp) /* * Perhaps venus returned a different container, or * something else went wrong. */ panic("coda_open: cp->c_ovp != container_vp"); } cp->c_ocount++; /* Flush the attribute cache if writing the file. */ if (flag & FWRITE) { cp->c_owrite++; cp->c_flags &= ~C_VATTR; } /* * Save the pair for the container file to speed * up subsequent reads while closed (mmap, program execution). * This is perhaps safe because venus will invalidate the node * before changing the container file mapping. */ cp->c_device = dev; cp->c_inode = inode; /* Open the container file. */ error = VOP_OPEN(container_vp, flag, cred); /* * Drop the lock on the container, after we have done VOP_OPEN * (which requires a locked vnode). */ VOP_UNLOCK(container_vp, 0); return(error); } /* * Close the cache file used for I/O and notify Venus. */ int coda_close(void *v) { /* true args */ struct vop_close_args *ap = v; struct vnode *vp = ap->a_vp; struct cnode *cp = VTOC(vp); int flag = ap->a_fflag; kauth_cred_t cred = ap->a_cred; /* locals */ int error; MARK_ENTRY(CODA_CLOSE_STATS); /* Check for close of control file. */ if (IS_CTL_VP(vp)) { MARK_INT_SAT(CODA_CLOSE_STATS); return(0); } /* * XXX The IS_UNMOUNTING part of this is very suspect. */ if (IS_UNMOUNTING(cp)) { if (cp->c_ovp) { #ifdef CODA_VERBOSE printf("coda_close: destroying container ref %d, ufs vp %p of vp %p/cp %p\n", vp->v_usecount, cp->c_ovp, vp, cp); #endif #ifdef hmm vgone(cp->c_ovp); #else vn_lock(cp->c_ovp, LK_EXCLUSIVE | LK_RETRY); VOP_CLOSE(cp->c_ovp, flag, cred); /* Do errors matter here? */ vput(cp->c_ovp); #endif } else { #ifdef CODA_VERBOSE printf("coda_close: NO container vp %p/cp %p\n", vp, cp); #endif } return ENODEV; } /* Lock the container node, and VOP_CLOSE it. */ vn_lock(cp->c_ovp, LK_EXCLUSIVE | LK_RETRY); VOP_CLOSE(cp->c_ovp, flag, cred); /* Do errors matter here? */ /* * Drop the lock we just obtained, and vrele the container vnode. * Decrement reference counts, and clear container vnode pointer on * last close. */ vput(cp->c_ovp); if (flag & FWRITE) --cp->c_owrite; if (--cp->c_ocount == 0) cp->c_ovp = NULL; error = venus_close(vtomi(vp), &cp->c_fid, flag, cred, curlwp); CODADEBUG(CODA_CLOSE, myprintf(("close: result %d\n",error)); ) return(error); } int coda_read(void *v) { struct vop_read_args *ap = v; ENTRY; return(coda_rdwr(ap->a_vp, ap->a_uio, UIO_READ, ap->a_ioflag, ap->a_cred, curlwp)); } int coda_write(void *v) { struct vop_write_args *ap = v; ENTRY; return(coda_rdwr(ap->a_vp, ap->a_uio, UIO_WRITE, ap->a_ioflag, ap->a_cred, curlwp)); } int coda_rdwr(struct vnode *vp, struct uio *uiop, enum uio_rw rw, int ioflag, kauth_cred_t cred, struct lwp *l) { /* upcall decl */ /* NOTE: container file operation!!! */ /* locals */ struct cnode *cp = VTOC(vp); struct vnode *cfvp = cp->c_ovp; struct proc *p = l->l_proc; int opened_internally = 0; int error = 0; MARK_ENTRY(CODA_RDWR_STATS); CODADEBUG(CODA_RDWR, myprintf(("coda_rdwr(%d, %p, %lu, %lld)\n", rw, uiop->uio_iov->iov_base, (unsigned long) uiop->uio_resid, (long long) uiop->uio_offset)); ) /* Check for rdwr of control object. */ if (IS_CTL_VP(vp)) { MARK_INT_FAIL(CODA_RDWR_STATS); return(EINVAL); } /* Redirect the request to UFS. */ /* * If file is not already open this must be a page * {read,write} request. Iget the cache file's inode * pointer if we still have its pair. * Otherwise, we must do an internal open to derive the * pair. * XXX Integrate this into a coherent strategy for container * file acquisition. */ if (cfvp == NULL) { /* * If we're dumping core, do the internal open. Otherwise * venus won't have the correct size of the core when * it's completely written. */ if (cp->c_inode != 0 && !(p && (p->p_acflag & ACORE))) { printf("coda_rdwr: grabbing container vnode, losing reference\n"); /* Get locked and refed vnode. */ error = coda_grab_vnode(cp->c_device, cp->c_inode, &cfvp); if (error) { MARK_INT_FAIL(CODA_RDWR_STATS); return(error); } /* * Drop lock. * XXX Where is reference released. */ VOP_UNLOCK(cfvp, 0); } else { printf("coda_rdwr: internal VOP_OPEN\n"); opened_internally = 1; MARK_INT_GEN(CODA_OPEN_STATS); error = VOP_OPEN(vp, (rw == UIO_READ ? FREAD : FWRITE), cred); #ifdef CODA_VERBOSE printf("coda_rdwr: Internally Opening %p\n", vp); #endif if (error) { MARK_INT_FAIL(CODA_RDWR_STATS); return(error); } cfvp = cp->c_ovp; } } /* Have UFS handle the call. */ CODADEBUG(CODA_RDWR, myprintf(("indirect rdwr: fid = %s, refcnt = %d\n", coda_f2s(&cp->c_fid), CTOV(cp)->v_usecount)); ) if (rw == UIO_READ) { error = VOP_READ(cfvp, uiop, ioflag, cred); } else { error = VOP_WRITE(cfvp, uiop, ioflag, cred); } if (error) MARK_INT_FAIL(CODA_RDWR_STATS); else MARK_INT_SAT(CODA_RDWR_STATS); /* Do an internal close if necessary. */ if (opened_internally) { MARK_INT_GEN(CODA_CLOSE_STATS); (void)VOP_CLOSE(vp, (rw == UIO_READ ? FREAD : FWRITE), cred); } /* Invalidate cached attributes if writing. */ if (rw == UIO_WRITE) cp->c_flags &= ~C_VATTR; return(error); } int coda_ioctl(void *v) { /* true args */ struct vop_ioctl_args *ap = v; struct vnode *vp = ap->a_vp; int com = ap->a_command; void *data = ap->a_data; int flag = ap->a_fflag; kauth_cred_t cred = ap->a_cred; /* locals */ int error; struct vnode *tvp; struct nameidata ndp; struct PioctlData *iap = (struct PioctlData *)data; MARK_ENTRY(CODA_IOCTL_STATS); CODADEBUG(CODA_IOCTL, myprintf(("in coda_ioctl on %s\n", iap->path));) /* Don't check for operation on a dying object, for ctlvp it shouldn't matter */ /* Must be control object to succeed. */ if (!IS_CTL_VP(vp)) { MARK_INT_FAIL(CODA_IOCTL_STATS); CODADEBUG(CODA_IOCTL, myprintf(("coda_ioctl error: vp != ctlvp"));) return (EOPNOTSUPP); } /* Look up the pathname. */ /* Should we use the name cache here? It would get it from lookupname sooner or later anyway, right? */ NDINIT(&ndp, LOOKUP, (iap->follow ? FOLLOW : NOFOLLOW), UIO_USERSPACE, iap->path); error = namei(&ndp); tvp = ndp.ni_vp; if (error) { MARK_INT_FAIL(CODA_IOCTL_STATS); CODADEBUG(CODA_IOCTL, myprintf(("coda_ioctl error: lookup returns %d\n", error));) return(error); } /* * Make sure this is a coda style cnode, but it may be a * different vfsp */ /* XXX: this totally violates the comment about vtagtype in vnode.h */ if (tvp->v_tag != VT_CODA) { vrele(tvp); MARK_INT_FAIL(CODA_IOCTL_STATS); CODADEBUG(CODA_IOCTL, myprintf(("coda_ioctl error: %s not a coda object\n", iap->path));) return(EINVAL); } if (iap->vi.in_size > VC_MAXDATASIZE) { vrele(tvp); return(EINVAL); } error = venus_ioctl(vtomi(tvp), &((VTOC(tvp))->c_fid), com, flag, data, cred, curlwp); if (error) MARK_INT_FAIL(CODA_IOCTL_STATS); else CODADEBUG(CODA_IOCTL, myprintf(("Ioctl returns %d \n", error)); ) vrele(tvp); return(error); } /* * To reduce the cost of a user-level venus;we cache attributes in * the kernel. Each cnode has storage allocated for an attribute. If * c_vattr is valid, return a reference to it. Otherwise, get the * attributes from venus and store them in the cnode. There is some * question if this method is a security leak. But I think that in * order to make this call, the user must have done a lookup and * opened the file, and therefore should already have access. */ int coda_getattr(void *v) { /* true args */ struct vop_getattr_args *ap = v; struct vnode *vp = ap->a_vp; struct cnode *cp = VTOC(vp); struct vattr *vap = ap->a_vap; kauth_cred_t cred = ap->a_cred; /* locals */ int error; MARK_ENTRY(CODA_GETATTR_STATS); /* Check for getattr of control object. */ if (IS_CTL_VP(vp)) { MARK_INT_FAIL(CODA_GETATTR_STATS); return(ENOENT); } /* Check to see if the attributes have already been cached */ if (VALID_VATTR(cp)) { CODADEBUG(CODA_GETATTR, { myprintf(("attr cache hit: %s\n", coda_f2s(&cp->c_fid)));}); CODADEBUG(CODA_GETATTR, if (!(codadebug & ~CODA_GETATTR)) print_vattr(&cp->c_vattr); ); *vap = cp->c_vattr; MARK_INT_SAT(CODA_GETATTR_STATS); return(0); } error = venus_getattr(vtomi(vp), &cp->c_fid, cred, curlwp, vap); if (!error) { CODADEBUG(CODA_GETATTR, myprintf(("getattr miss %s: result %d\n", coda_f2s(&cp->c_fid), error)); ) CODADEBUG(CODA_GETATTR, if (!(codadebug & ~CODA_GETATTR)) print_vattr(vap); ); /* If not open for write, store attributes in cnode */ if ((cp->c_owrite == 0) && (coda_attr_cache)) { cp->c_vattr = *vap; cp->c_flags |= C_VATTR; } } return(error); } int coda_setattr(void *v) { /* true args */ struct vop_setattr_args *ap = v; struct vnode *vp = ap->a_vp; struct cnode *cp = VTOC(vp); struct vattr *vap = ap->a_vap; kauth_cred_t cred = ap->a_cred; /* locals */ int error; MARK_ENTRY(CODA_SETATTR_STATS); /* Check for setattr of control object. */ if (IS_CTL_VP(vp)) { MARK_INT_FAIL(CODA_SETATTR_STATS); return(ENOENT); } if (codadebug & CODADBGMSK(CODA_SETATTR)) { print_vattr(vap); } error = venus_setattr(vtomi(vp), &cp->c_fid, vap, cred, curlwp); if (!error) cp->c_flags &= ~C_VATTR; CODADEBUG(CODA_SETATTR, myprintf(("setattr %d\n", error)); ) return(error); } int coda_access(void *v) { /* true args */ struct vop_access_args *ap = v; struct vnode *vp = ap->a_vp; struct cnode *cp = VTOC(vp); int mode = ap->a_mode; kauth_cred_t cred = ap->a_cred; /* locals */ int error; MARK_ENTRY(CODA_ACCESS_STATS); /* Check for access of control object. Only read access is allowed on it. */ if (IS_CTL_VP(vp)) { /* bogus hack - all will be marked as successes */ MARK_INT_SAT(CODA_ACCESS_STATS); return(((mode & VREAD) && !(mode & (VWRITE | VEXEC))) ? 0 : EACCES); } /* * if the file is a directory, and we are checking exec (eg lookup) * access, and the file is in the namecache, then the user must have * lookup access to it. */ if (coda_access_cache) { if ((vp->v_type == VDIR) && (mode & VEXEC)) { if (coda_nc_lookup(cp, ".", 1, cred)) { MARK_INT_SAT(CODA_ACCESS_STATS); return(0); /* it was in the cache */ } } } error = venus_access(vtomi(vp), &cp->c_fid, mode, cred, curlwp); return(error); } /* * CODA abort op, called after namei() when a CREATE/DELETE isn't actually * done. If a buffer has been saved in anticipation of a coda_create or * a coda_remove, delete it. */ /* ARGSUSED */ int coda_abortop(void *v) { /* true args */ struct vop_abortop_args /* { struct vnode *a_dvp; struct componentname *a_cnp; } */ *ap = v; /* upcall decl */ /* locals */ if ((ap->a_cnp->cn_flags & (HASBUF | SAVESTART)) == HASBUF) PNBUF_PUT(ap->a_cnp->cn_pnbuf); return (0); } int coda_readlink(void *v) { /* true args */ struct vop_readlink_args *ap = v; struct vnode *vp = ap->a_vp; struct cnode *cp = VTOC(vp); struct uio *uiop = ap->a_uio; kauth_cred_t cred = ap->a_cred; /* locals */ struct lwp *l = curlwp; int error; char *str; int len; MARK_ENTRY(CODA_READLINK_STATS); /* Check for readlink of control object. */ if (IS_CTL_VP(vp)) { MARK_INT_FAIL(CODA_READLINK_STATS); return(ENOENT); } if ((coda_symlink_cache) && (VALID_SYMLINK(cp))) { /* symlink was cached */ uiop->uio_rw = UIO_READ; error = uiomove(cp->c_symlink, (int)cp->c_symlen, uiop); if (error) MARK_INT_FAIL(CODA_READLINK_STATS); else MARK_INT_SAT(CODA_READLINK_STATS); return(error); } error = venus_readlink(vtomi(vp), &cp->c_fid, cred, l, &str, &len); if (!error) { uiop->uio_rw = UIO_READ; error = uiomove(str, len, uiop); if (coda_symlink_cache) { cp->c_symlink = str; cp->c_symlen = len; cp->c_flags |= C_SYMLINK; } else CODA_FREE(str, len); } CODADEBUG(CODA_READLINK, myprintf(("in readlink result %d\n",error));) return(error); } int coda_fsync(void *v) { /* true args */ struct vop_fsync_args *ap = v; struct vnode *vp = ap->a_vp; struct cnode *cp = VTOC(vp); kauth_cred_t cred = ap->a_cred; /* locals */ struct vnode *convp = cp->c_ovp; int error; MARK_ENTRY(CODA_FSYNC_STATS); /* Check for fsync on an unmounting object */ /* The NetBSD kernel, in it's infinite wisdom, can try to fsync * after an unmount has been initiated. This is a Bad Thing, * which we have to avoid. Not a legitimate failure for stats. */ if (IS_UNMOUNTING(cp)) { return(ENODEV); } /* Check for fsync of control object. */ if (IS_CTL_VP(vp)) { MARK_INT_SAT(CODA_FSYNC_STATS); return(0); } if (convp) VOP_FSYNC(convp, cred, MNT_WAIT, 0, 0); /* * We can expect fsync on any vnode at all if venus is pruging it. * Venus can't very well answer the fsync request, now can it? * Hopefully, it won't have to, because hopefully, venus preserves * the (possibly untrue) invariant that it never purges an open * vnode. Hopefully. */ if (cp->c_flags & C_PURGING) { return(0); } error = venus_fsync(vtomi(vp), &cp->c_fid, cred, curlwp); CODADEBUG(CODA_FSYNC, myprintf(("in fsync result %d\n",error)); ); return(error); } /* * vp is locked on entry, and we must unlock it. * XXX This routine is suspect and probably needs rewriting. */ int coda_inactive(void *v) { /* true args */ struct vop_inactive_args *ap = v; struct vnode *vp = ap->a_vp; struct cnode *cp = VTOC(vp); kauth_cred_t cred __attribute__((unused)) = NULL; /* We don't need to send inactive to venus - DCS */ MARK_ENTRY(CODA_INACTIVE_STATS); if (IS_CTL_VP(vp)) { MARK_INT_SAT(CODA_INACTIVE_STATS); return 0; } CODADEBUG(CODA_INACTIVE, myprintf(("in inactive, %s, vfsp %p\n", coda_f2s(&cp->c_fid), vp->v_mount));) /* If an array has been allocated to hold the symlink, deallocate it */ if ((coda_symlink_cache) && (VALID_SYMLINK(cp))) { if (cp->c_symlink == NULL) panic("coda_inactive: null symlink pointer in cnode"); CODA_FREE(cp->c_symlink, cp->c_symlen); cp->c_flags &= ~C_SYMLINK; cp->c_symlen = 0; } /* Remove it from the table so it can't be found. */ coda_unsave(cp); if (vp->v_mount->mnt_data == NULL) { myprintf(("Help! vfsp->vfs_data was NULL, but vnode %p wasn't dying\n", vp)); panic("badness in coda_inactive"); } if (IS_UNMOUNTING(cp)) { /* XXX Do we need to VOP_CLOSE container vnodes? */ if (vp->v_usecount > 0) printf("coda_inactive: IS_UNMOUNTING %p usecount %d\n", vp, vp->v_usecount); if (cp->c_ovp != NULL) printf("coda_inactive: %p ovp != NULL\n", vp); VOP_UNLOCK(vp, 0); } else { /* Sanity checks that perhaps should be panic. */ if (vp->v_usecount) { printf("coda_inactive: %p usecount %d\n", vp, vp->v_usecount); } if (cp->c_ovp != NULL) { printf("coda_inactive: %p ovp != NULL\n", vp); } VOP_UNLOCK(vp, 0); vgone(vp); } MARK_INT_SAT(CODA_INACTIVE_STATS); return(0); } /* * Coda does not use the normal namecache, but a private version. * Consider how to use the standard facility instead. */ int coda_lookup(void *v) { /* true args */ struct vop_lookup_args *ap = v; /* (locked) vnode of dir in which to do lookup */ struct vnode *dvp = ap->a_dvp; struct cnode *dcp = VTOC(dvp); /* output variable for result */ struct vnode **vpp = ap->a_vpp; /* name to lookup */ struct componentname *cnp = ap->a_cnp; kauth_cred_t cred = cnp->cn_cred; struct lwp *l = curlwp; /* locals */ struct cnode *cp; const char *nm = cnp->cn_nameptr; int len = cnp->cn_namelen; int flags = cnp->cn_flags; int isdot; CodaFid VFid; int vtype; int error = 0; MARK_ENTRY(CODA_LOOKUP_STATS); CODADEBUG(CODA_LOOKUP, myprintf(("lookup: %s in %s\n", nm, coda_f2s(&dcp->c_fid)));); /* * XXX componentname flags in MODMASK are not handled at all */ /* * The overall strategy is to switch on the lookup type and get a * result vnode that is vref'd but not locked. Then, the code at * exit: switches on ., .., and regular lookups and does the right * locking. */ /* Check for lookup of control object. */ if (IS_CTL_NAME(dvp, nm, len)) { *vpp = coda_ctlvp; vref(*vpp); MARK_INT_SAT(CODA_LOOKUP_STATS); goto exit; } /* Avoid trying to hand venus an unreasonably long name. */ if (len+1 > CODA_MAXNAMLEN) { MARK_INT_FAIL(CODA_LOOKUP_STATS); CODADEBUG(CODA_LOOKUP, myprintf(("name too long: lookup, %s (%s)\n", coda_f2s(&dcp->c_fid), nm));); *vpp = (struct vnode *)0; error = EINVAL; goto exit; } /* * XXX Check for DOT lookups, and short circuit all the caches, * just doing an extra vref. (venus guarantees that lookup of * . returns self.) */ isdot = (len == 1 && nm[0] == '.'); /* * Try to resolve the lookup in the minicache. If that fails, ask * venus to do the lookup. XXX The interaction between vnode * locking and any locking that coda does is not clear. */ cp = coda_nc_lookup(dcp, nm, len, cred); if (cp) { *vpp = CTOV(cp); vref(*vpp); CODADEBUG(CODA_LOOKUP, myprintf(("lookup result %d vpp %p\n",error,*vpp));) } else { /* The name wasn't cached, so ask Venus. */ error = venus_lookup(vtomi(dvp), &dcp->c_fid, nm, len, cred, l, &VFid, &vtype); if (error) { MARK_INT_FAIL(CODA_LOOKUP_STATS); CODADEBUG(CODA_LOOKUP, myprintf(("lookup error on %s (%s)%d\n", coda_f2s(&dcp->c_fid), nm, error));) *vpp = (struct vnode *)0; } else { MARK_INT_SAT(CODA_LOOKUP_STATS); CODADEBUG(CODA_LOOKUP, myprintf(("lookup: %s type %o result %d\n", coda_f2s(&VFid), vtype, error)); ) cp = make_coda_node(&VFid, dvp->v_mount, vtype); *vpp = CTOV(cp); /* vpp is now vrefed. */ /* * Unless this vnode is marked CODA_NOCACHE, enter it into * the coda name cache to avoid a future venus round-trip. * XXX Interaction with componentname NOCACHE is unclear. */ if (!(vtype & CODA_NOCACHE)) coda_nc_enter(VTOC(dvp), nm, len, cred, VTOC(*vpp)); } } exit: /* * If we are creating, and this was the last name to be looked up, * and the error was ENOENT, then make the leaf NULL and return * success. * XXX Check against new lookup rules. */ if (((cnp->cn_nameiop == CREATE) || (cnp->cn_nameiop == RENAME)) && (cnp->cn_flags & ISLASTCN) && (error == ENOENT)) { error = EJUSTRETURN; cnp->cn_flags |= SAVENAME; *ap->a_vpp = NULL; } /* * If we are removing, and we are at the last element, and we * found it, then we need to keep the name around so that the * removal will go ahead as planned. * XXX Check against new lookup rules. */ if ((cnp->cn_nameiop == DELETE) && (cnp->cn_flags & ISLASTCN) && !error) { cnp->cn_flags |= SAVENAME; } /* * If the lookup succeeded, we must generally lock the returned * vnode. This could be a ., .., or normal lookup. See * vnodeops(9) for the details. */ /* * XXX LK_RETRY is likely incorrect. Handle vn_lock failure * somehow, and remove LK_RETRY. */ if (!error || (error == EJUSTRETURN)) { /* Lookup has a value and it isn't "."? */ if (*ap->a_vpp && (*ap->a_vpp != dvp)) { if (flags & ISDOTDOT) /* ..: unlock parent */ VOP_UNLOCK(dvp, 0); /* all but .: lock child */ vn_lock(*ap->a_vpp, LK_EXCLUSIVE | LK_RETRY); if (flags & ISDOTDOT) /* ..: relock parent */ vn_lock(dvp, LK_EXCLUSIVE | LK_RETRY); } /* else .: leave dvp locked */ } else { /* The lookup failed, so return NULL. Leave dvp locked. */ *ap->a_vpp = NULL; } return(error); } /*ARGSUSED*/ int coda_create(void *v) { /* true args */ struct vop_create_args *ap = v; struct vnode *dvp = ap->a_dvp; struct cnode *dcp = VTOC(dvp); struct vattr *va = ap->a_vap; int exclusive = 1; int mode = ap->a_vap->va_mode; struct vnode **vpp = ap->a_vpp; struct componentname *cnp = ap->a_cnp; kauth_cred_t cred = cnp->cn_cred; struct lwp *l = curlwp; /* locals */ int error; struct cnode *cp; const char *nm = cnp->cn_nameptr; int len = cnp->cn_namelen; CodaFid VFid; struct vattr attr; MARK_ENTRY(CODA_CREATE_STATS); /* All creates are exclusive XXX */ /* I'm assuming the 'mode' argument is the file mode bits XXX */ /* Check for create of control object. */ if (IS_CTL_NAME(dvp, nm, len)) { *vpp = (struct vnode *)0; MARK_INT_FAIL(CODA_CREATE_STATS); return(EACCES); } error = venus_create(vtomi(dvp), &dcp->c_fid, nm, len, exclusive, mode, va, cred, l, &VFid, &attr); if (!error) { /* * XXX Violation of venus/kernel invariants is a difficult case, * but venus should not be able to cause a panic. */ /* If this is an exclusive create, panic if the file already exists. */ /* Venus should have detected the file and reported EEXIST. */ if ((exclusive == 1) && (coda_find(&VFid) != NULL)) panic("cnode existed for newly created file!"); cp = make_coda_node(&VFid, dvp->v_mount, attr.va_type); *vpp = CTOV(cp); /* XXX vnodeops doesn't say this argument can be changed. */ /* Update va to reflect the new attributes. */ (*va) = attr; /* Update the attribute cache and mark it as valid */ if (coda_attr_cache) { VTOC(*vpp)->c_vattr = attr; VTOC(*vpp)->c_flags |= C_VATTR; } /* Invalidate parent's attr cache (modification time has changed). */ VTOC(dvp)->c_flags &= ~C_VATTR; /* enter the new vnode in the Name Cache */ coda_nc_enter(VTOC(dvp), nm, len, cred, VTOC(*vpp)); CODADEBUG(CODA_CREATE, myprintf(("create: %s, result %d\n", coda_f2s(&VFid), error)); ) } else { *vpp = (struct vnode *)0; CODADEBUG(CODA_CREATE, myprintf(("create error %d\n", error));) } /* * vnodeops(9) says that we must unlock the parent and lock the child. * XXX Should we lock the child first? */ vput(dvp); if (!error) { if ((cnp->cn_flags & LOCKLEAF) == 0) { /* This should not happen; flags are for lookup only. */ printf("coda_create: LOCKLEAF not set!\n"); } if ((error = vn_lock(*ap->a_vpp, LK_EXCLUSIVE))) { /* XXX Perhaps avoid this panic. */ panic("coda_create: couldn't lock child"); } } /* Per vnodeops(9), free name except on success and SAVESTART. */ if (error || (cnp->cn_flags & SAVESTART) == 0) { PNBUF_PUT(cnp->cn_pnbuf); } return(error); } int coda_remove(void *v) { /* true args */ struct vop_remove_args *ap = v; struct vnode *dvp = ap->a_dvp; struct cnode *cp = VTOC(dvp); struct vnode *vp = ap->a_vp; struct componentname *cnp = ap->a_cnp; kauth_cred_t cred = cnp->cn_cred; struct lwp *l = curlwp; /* locals */ int error; const char *nm = cnp->cn_nameptr; int len = cnp->cn_namelen; struct cnode *tp; MARK_ENTRY(CODA_REMOVE_STATS); CODADEBUG(CODA_REMOVE, myprintf(("remove: %s in %s\n", nm, coda_f2s(&cp->c_fid)));); /* Remove the file's entry from the CODA Name Cache */ /* We're being conservative here, it might be that this person * doesn't really have sufficient access to delete the file * but we feel zapping the entry won't really hurt anyone -- dcs */ /* I'm gonna go out on a limb here. If a file and a hardlink to it * exist, and one is removed, the link count on the other will be * off by 1. We could either invalidate the attrs if cached, or * fix them. I'll try to fix them. DCS 11/8/94 */ tp = coda_nc_lookup(VTOC(dvp), nm, len, cred); if (tp) { if (VALID_VATTR(tp)) { /* If attrs are cached */ if (tp->c_vattr.va_nlink > 1) { /* If it's a hard link */ tp->c_vattr.va_nlink--; } } coda_nc_zapfile(VTOC(dvp), nm, len); /* No need to flush it if it doesn't exist! */ } /* Invalidate the parent's attr cache, the modification time has changed */ VTOC(dvp)->c_flags &= ~C_VATTR; /* Check for remove of control object. */ if (IS_CTL_NAME(dvp, nm, len)) { MARK_INT_FAIL(CODA_REMOVE_STATS); return(ENOENT); } error = venus_remove(vtomi(dvp), &cp->c_fid, nm, len, cred, l); CODADEBUG(CODA_REMOVE, myprintf(("in remove result %d\n",error)); ) /* * Unlock parent and child (avoiding double if "."). */ if (dvp == vp) { vrele(vp); } else { vput(vp); } vput(dvp); return(error); } /* * dvp is the directory where the link is to go, and is locked. * vp is the object to be linked to, and is unlocked. * At exit, we must unlock dvp, and vput dvp. */ int coda_link(void *v) { /* true args */ struct vop_link_args *ap = v; struct vnode *vp = ap->a_vp; struct cnode *cp = VTOC(vp); struct vnode *dvp = ap->a_dvp; struct cnode *dcp = VTOC(dvp); struct componentname *cnp = ap->a_cnp; kauth_cred_t cred = cnp->cn_cred; struct lwp *l = curlwp; /* locals */ int error; const char *nm = cnp->cn_nameptr; int len = cnp->cn_namelen; MARK_ENTRY(CODA_LINK_STATS); if (codadebug & CODADBGMSK(CODA_LINK)) { myprintf(("nb_link: vp fid: %s\n", coda_f2s(&cp->c_fid))); myprintf(("nb_link: dvp fid: %s)\n", coda_f2s(&dcp->c_fid))); } if (codadebug & CODADBGMSK(CODA_LINK)) { myprintf(("link: vp fid: %s\n", coda_f2s(&cp->c_fid))); myprintf(("link: dvp fid: %s\n", coda_f2s(&dcp->c_fid))); } /* Check for link to/from control object. */ if (IS_CTL_NAME(dvp, nm, len) || IS_CTL_VP(vp)) { MARK_INT_FAIL(CODA_LINK_STATS); return(EACCES); } /* If linking . to a name, error out earlier. */ if (vp == dvp) { printf("coda_link vp==dvp\n"); error = EISDIR; goto exit; } /* XXX Why does venus_link need the vnode to be locked?*/ if ((error = vn_lock(vp, LK_EXCLUSIVE)) != 0) { printf("coda_link: couldn't lock vnode %p\n", vp); error = EFAULT; /* XXX better value */ goto exit; } error = venus_link(vtomi(vp), &cp->c_fid, &dcp->c_fid, nm, len, cred, l); VOP_UNLOCK(vp, 0); /* Invalidate parent's attr cache (the modification time has changed). */ VTOC(dvp)->c_flags &= ~C_VATTR; /* Invalidate child's attr cache (XXX why). */ VTOC(vp)->c_flags &= ~C_VATTR; CODADEBUG(CODA_LINK, myprintf(("in link result %d\n",error)); ) exit: vput(dvp); return(error); } int coda_rename(void *v) { /* true args */ struct vop_rename_args *ap = v; struct vnode *odvp = ap->a_fdvp; struct cnode *odcp = VTOC(odvp); struct componentname *fcnp = ap->a_fcnp; struct vnode *ndvp = ap->a_tdvp; struct cnode *ndcp = VTOC(ndvp); struct componentname *tcnp = ap->a_tcnp; kauth_cred_t cred = fcnp->cn_cred; struct lwp *l = curlwp; /* true args */ int error; const char *fnm = fcnp->cn_nameptr; int flen = fcnp->cn_namelen; const char *tnm = tcnp->cn_nameptr; int tlen = tcnp->cn_namelen; MARK_ENTRY(CODA_RENAME_STATS); /* Hmmm. The vnodes are already looked up. Perhaps they are locked? This could be Bad. XXX */ #ifdef OLD_DIAGNOSTIC if ((fcnp->cn_cred != tcnp->cn_cred) || (fcnp->cn_lwp != tcnp->cn_lwp)) { panic("coda_rename: component names don't agree"); } #endif /* Check for rename involving control object. */ if (IS_CTL_NAME(odvp, fnm, flen) || IS_CTL_NAME(ndvp, tnm, tlen)) { MARK_INT_FAIL(CODA_RENAME_STATS); return(EACCES); } /* Problem with moving directories -- need to flush entry for .. */ if (odvp != ndvp) { struct cnode *ovcp = coda_nc_lookup(VTOC(odvp), fnm, flen, cred); if (ovcp) { struct vnode *ovp = CTOV(ovcp); if ((ovp) && (ovp->v_type == VDIR)) /* If it's a directory */ coda_nc_zapfile(VTOC(ovp),"..", 2); } } /* Remove the entries for both source and target files */ coda_nc_zapfile(VTOC(odvp), fnm, flen); coda_nc_zapfile(VTOC(ndvp), tnm, tlen); /* Invalidate the parent's attr cache, the modification time has changed */ VTOC(odvp)->c_flags &= ~C_VATTR; VTOC(ndvp)->c_flags &= ~C_VATTR; if (flen+1 > CODA_MAXNAMLEN) { MARK_INT_FAIL(CODA_RENAME_STATS); error = EINVAL; goto exit; } if (tlen+1 > CODA_MAXNAMLEN) { MARK_INT_FAIL(CODA_RENAME_STATS); error = EINVAL; goto exit; } error = venus_rename(vtomi(odvp), &odcp->c_fid, &ndcp->c_fid, fnm, flen, tnm, tlen, cred, l); exit: CODADEBUG(CODA_RENAME, myprintf(("in rename result %d\n",error));) /* XXX - do we need to call cache pureg on the moved vnode? */ cache_purge(ap->a_fvp); /* It seems to be incumbent on us to drop locks on all four vnodes */ /* From-vnodes are not locked, only ref'd. To-vnodes are locked. */ vrele(ap->a_fvp); vrele(odvp); if (ap->a_tvp) { if (ap->a_tvp == ndvp) { vrele(ap->a_tvp); } else { vput(ap->a_tvp); } } vput(ndvp); return(error); } int coda_mkdir(void *v) { /* true args */ struct vop_mkdir_args *ap = v; struct vnode *dvp = ap->a_dvp; struct cnode *dcp = VTOC(dvp); struct componentname *cnp = ap->a_cnp; struct vattr *va = ap->a_vap; struct vnode **vpp = ap->a_vpp; kauth_cred_t cred = cnp->cn_cred; struct lwp *l = curlwp; /* locals */ int error; const char *nm = cnp->cn_nameptr; int len = cnp->cn_namelen; struct cnode *cp; CodaFid VFid; struct vattr ova; MARK_ENTRY(CODA_MKDIR_STATS); /* Check for mkdir of target object. */ if (IS_CTL_NAME(dvp, nm, len)) { *vpp = (struct vnode *)0; MARK_INT_FAIL(CODA_MKDIR_STATS); return(EACCES); } if (len+1 > CODA_MAXNAMLEN) { *vpp = (struct vnode *)0; MARK_INT_FAIL(CODA_MKDIR_STATS); return(EACCES); } error = venus_mkdir(vtomi(dvp), &dcp->c_fid, nm, len, va, cred, l, &VFid, &ova); if (!error) { if (coda_find(&VFid) != NULL) panic("cnode existed for newly created directory!"); cp = make_coda_node(&VFid, dvp->v_mount, va->va_type); *vpp = CTOV(cp); /* enter the new vnode in the Name Cache */ coda_nc_enter(VTOC(dvp), nm, len, cred, VTOC(*vpp)); /* as a side effect, enter "." and ".." for the directory */ coda_nc_enter(VTOC(*vpp), ".", 1, cred, VTOC(*vpp)); coda_nc_enter(VTOC(*vpp), "..", 2, cred, VTOC(dvp)); if (coda_attr_cache) { VTOC(*vpp)->c_vattr = ova; /* update the attr cache */ VTOC(*vpp)->c_flags |= C_VATTR; /* Valid attributes in cnode */ } /* Invalidate the parent's attr cache, the modification time has changed */ VTOC(dvp)->c_flags &= ~C_VATTR; CODADEBUG( CODA_MKDIR, myprintf(("mkdir: %s result %d\n", coda_f2s(&VFid), error)); ) } else { *vpp = (struct vnode *)0; CODADEBUG(CODA_MKDIR, myprintf(("mkdir error %d\n",error));) } /* * Currently, all mkdirs explicitly vput their dvp's. * It also appears that we *must* lock the vpp, since * lockleaf isn't set, but someone down the road is going * to try to unlock the new directory. */ vput(dvp); if (!error) { if ((error = vn_lock(*ap->a_vpp, LK_EXCLUSIVE))) { panic("coda_mkdir: couldn't lock child"); } } /* Per vnodeops(9), free name except on success and SAVESTART. */ if (error || (cnp->cn_flags & SAVESTART) == 0) { PNBUF_PUT(cnp->cn_pnbuf); } return(error); } int coda_rmdir(void *v) { /* true args */ struct vop_rmdir_args *ap = v; struct vnode *dvp = ap->a_dvp; struct cnode *dcp = VTOC(dvp); struct vnode *vp = ap->a_vp; struct componentname *cnp = ap->a_cnp; kauth_cred_t cred = cnp->cn_cred; struct lwp *l = curlwp; /* true args */ int error; const char *nm = cnp->cn_nameptr; int len = cnp->cn_namelen; struct cnode *cp; MARK_ENTRY(CODA_RMDIR_STATS); /* Check for rmdir of control object. */ if (IS_CTL_NAME(dvp, nm, len)) { MARK_INT_FAIL(CODA_RMDIR_STATS); return(ENOENT); } /* Can't remove . in self. */ if (dvp == vp) { printf("coda_rmdir: dvp == vp\n"); error = EINVAL; goto exit; } /* * The caller may not have adequate permissions, and the venus * operation may fail, but it doesn't hurt from a correctness * viewpoint to invalidate cache entries. * XXX Why isn't this done after the venus_rmdir call? */ /* Look up child in name cache (by name, from parent). */ cp = coda_nc_lookup(dcp, nm, len, cred); /* If found, remove all children of the child (., ..). */ if (cp) coda_nc_zapParentfid(&(cp->c_fid), NOT_DOWNCALL); /* Remove child's own entry. */ coda_nc_zapfile(dcp, nm, len); /* Invalidate parent's attr cache (the modification time has changed). */ dcp->c_flags &= ~C_VATTR; error = venus_rmdir(vtomi(dvp), &dcp->c_fid, nm, len, cred, l); CODADEBUG(CODA_RMDIR, myprintf(("in rmdir result %d\n", error)); ) exit: /* vput both vnodes */ vput(dvp); if (dvp == vp) { vrele(vp); } else { vput(vp); } return(error); } int coda_symlink(void *v) { /* true args */ struct vop_symlink_args *ap = v; struct vnode *dvp = ap->a_dvp; struct cnode *dcp = VTOC(dvp); /* a_vpp is used in place below */ struct componentname *cnp = ap->a_cnp; struct vattr *tva = ap->a_vap; char *path = ap->a_target; kauth_cred_t cred = cnp->cn_cred; struct lwp *l = curlwp; /* locals */ int error; u_long saved_cn_flags; const char *nm = cnp->cn_nameptr; int len = cnp->cn_namelen; int plen = strlen(path); /* * Here's the strategy for the moment: perform the symlink, then * do a lookup to grab the resulting vnode. I know this requires * two communications with Venus for a new sybolic link, but * that's the way the ball bounces. I don't yet want to change * the way the Mach symlink works. When Mach support is * deprecated, we should change symlink so that the common case * returns the resultant vnode in a vpp argument. */ MARK_ENTRY(CODA_SYMLINK_STATS); /* Check for symlink of control object. */ if (IS_CTL_NAME(dvp, nm, len)) { MARK_INT_FAIL(CODA_SYMLINK_STATS); error = EACCES; goto exit; } if (plen+1 > CODA_MAXPATHLEN) { MARK_INT_FAIL(CODA_SYMLINK_STATS); error = EINVAL; goto exit; } if (len+1 > CODA_MAXNAMLEN) { MARK_INT_FAIL(CODA_SYMLINK_STATS); error = EINVAL; goto exit; } error = venus_symlink(vtomi(dvp), &dcp->c_fid, path, plen, nm, len, tva, cred, l); /* Invalidate the parent's attr cache (modification time has changed). */ dcp->c_flags &= ~C_VATTR; if (!error) { /* * VOP_SYMLINK is not defined to pay attention to cnp->cn_flags; * these are defined only for VOP_LOOKUP. We desire to reuse * cnp for a VOP_LOOKUP operation, and must be sure to not pass * stray flags passed to us. Such stray flags can occur because * sys_symlink makes a namei call and then reuses the * componentname structure. */ /* * XXX Arguably we should create our own componentname structure * and not reuse the one that was passed in. */ saved_cn_flags = cnp->cn_flags; cnp->cn_flags &= ~(MODMASK | OPMASK); cnp->cn_flags |= LOOKUP; error = VOP_LOOKUP(dvp, ap->a_vpp, cnp); cnp->cn_flags = saved_cn_flags; /* Either an error occurs, or ap->a_vpp is locked. */ } exit: /* unlock and deference parent */ vput(dvp); /* Per vnodeops(9), free name except on success and SAVESTART. */ if (error || (cnp->cn_flags & SAVESTART) == 0) { PNBUF_PUT(cnp->cn_pnbuf); } CODADEBUG(CODA_SYMLINK, myprintf(("in symlink result %d\n",error)); ) return(error); } /* * Read directory entries. */ int coda_readdir(void *v) { /* true args */ struct vop_readdir_args *ap = v; struct vnode *vp = ap->a_vp; struct cnode *cp = VTOC(vp); struct uio *uiop = ap->a_uio; kauth_cred_t cred = ap->a_cred; int *eofflag = ap->a_eofflag; off_t **cookies = ap->a_cookies; int *ncookies = ap->a_ncookies; /* upcall decl */ /* locals */ int error = 0; MARK_ENTRY(CODA_READDIR_STATS); CODADEBUG(CODA_READDIR, myprintf(("coda_readdir(%p, %lu, %lld)\n", uiop->uio_iov->iov_base, (unsigned long) uiop->uio_resid, (long long) uiop->uio_offset)); ) /* Check for readdir of control object. */ if (IS_CTL_VP(vp)) { MARK_INT_FAIL(CODA_READDIR_STATS); return(ENOENT); } { /* Redirect the request to UFS. */ /* If directory is not already open do an "internal open" on it. */ int opened_internally = 0; if (cp->c_ovp == NULL) { opened_internally = 1; MARK_INT_GEN(CODA_OPEN_STATS); error = VOP_OPEN(vp, FREAD, cred); #ifdef CODA_VERBOSE printf("coda_readdir: Internally Opening %p\n", vp); #endif if (error) return(error); } else vp = cp->c_ovp; /* Have UFS handle the call. */ CODADEBUG(CODA_READDIR, myprintf(( "indirect readdir: fid = %s, refcnt = %d\n", coda_f2s(&cp->c_fid), vp->v_usecount)); ) error = VOP_READDIR(vp, uiop, cred, eofflag, cookies, ncookies); if (error) MARK_INT_FAIL(CODA_READDIR_STATS); else MARK_INT_SAT(CODA_READDIR_STATS); /* Do an "internal close" if necessary. */ if (opened_internally) { MARK_INT_GEN(CODA_CLOSE_STATS); (void)VOP_CLOSE(vp, FREAD, cred); } } return(error); } /* * Convert from file system blocks to device blocks */ int coda_bmap(void *v) { /* XXX on the global proc */ /* true args */ struct vop_bmap_args *ap = v; struct vnode *vp __attribute__((unused)) = ap->a_vp; /* file's vnode */ daddr_t bn __attribute__((unused)) = ap->a_bn; /* fs block number */ struct vnode **vpp = ap->a_vpp; /* RETURN vp of device */ daddr_t *bnp __attribute__((unused)) = ap->a_bnp; /* RETURN device block number */ struct lwp *l __attribute__((unused)) = curlwp; /* upcall decl */ /* locals */ *vpp = (struct vnode *)0; myprintf(("coda_bmap called!\n")); return(EINVAL); } /* * I don't think the following two things are used anywhere, so I've * commented them out * * struct buf *async_bufhead; * int async_daemon_count; */ int coda_strategy(void *v) { /* true args */ struct vop_strategy_args *ap = v; struct buf *bp __attribute__((unused)) = ap->a_bp; struct lwp *l __attribute__((unused)) = curlwp; /* upcall decl */ /* locals */ myprintf(("coda_strategy called! ")); return(EINVAL); } int coda_reclaim(void *v) { /* true args */ struct vop_reclaim_args *ap = v; struct vnode *vp = ap->a_vp; struct cnode *cp = VTOC(vp); /* upcall decl */ /* locals */ /* * Forced unmount/flush will let vnodes with non zero use be destroyed! */ ENTRY; if (IS_UNMOUNTING(cp)) { #ifdef DEBUG if (VTOC(vp)->c_ovp) { if (IS_UNMOUNTING(cp)) printf("coda_reclaim: c_ovp not void: vp %p, cp %p\n", vp, cp); } #endif } else { #ifdef OLD_DIAGNOSTIC if (vp->v_usecount != 0) print("coda_reclaim: pushing active %p\n", vp); if (VTOC(vp)->c_ovp) { panic("coda_reclaim: c_ovp not void"); } #endif } cache_purge(vp); coda_free(VTOC(vp)); SET_VTOC(vp) = NULL; return (0); } int coda_lock(void *v) { /* true args */ struct vop_lock_args *ap = v; struct vnode *vp = ap->a_vp; struct cnode *cp = VTOC(vp); /* upcall decl */ /* locals */ ENTRY; if (coda_lockdebug) { myprintf(("Attempting lock on %s\n", coda_f2s(&cp->c_fid))); } return (lockmgr(&vp->v_lock, ap->a_flags, &vp->v_interlock)); } int coda_unlock(void *v) { /* true args */ struct vop_unlock_args *ap = v; struct vnode *vp = ap->a_vp; struct cnode *cp = VTOC(vp); /* upcall decl */ /* locals */ ENTRY; if (coda_lockdebug) { myprintf(("Attempting unlock on %s\n", coda_f2s(&cp->c_fid))); } return (lockmgr(&vp->v_lock, ap->a_flags | LK_RELEASE, &vp->v_interlock)); } int coda_islocked(void *v) { /* true args */ struct vop_islocked_args *ap = v; ENTRY; return (lockstatus(&ap->a_vp->v_lock)); } /* * Given a device and inode, obtain a locked vnode. One reference is * obtained and passed back to the caller. */ int coda_grab_vnode(dev_t dev, ino_t ino, struct vnode **vpp) { int error; struct mount *mp; /* Obtain mount point structure from device. */ if (!(mp = devtomp(dev))) { myprintf(("coda_grab_vnode: devtomp(%d) returns NULL\n", dev)); return(ENXIO); } /* * Obtain vnode from mount point and inode. * XXX VFS_VGET does not clearly define locked/referenced state of * returned vnode. */ error = VFS_VGET(mp, ino, vpp); if (error) { myprintf(("coda_grab_vnode: iget/vget(%d, %llu) returns %p, err %d\n", dev, (unsigned long long)ino, *vpp, error)); return(ENOENT); } return(0); } void print_vattr(struct vattr *attr) { const char *typestr; switch (attr->va_type) { case VNON: typestr = "VNON"; break; case VREG: typestr = "VREG"; break; case VDIR: typestr = "VDIR"; break; case VBLK: typestr = "VBLK"; break; case VCHR: typestr = "VCHR"; break; case VLNK: typestr = "VLNK"; break; case VSOCK: typestr = "VSCK"; break; case VFIFO: typestr = "VFFO"; break; case VBAD: typestr = "VBAD"; break; default: typestr = "????"; break; } myprintf(("attr: type %s mode %d uid %d gid %d fsid %d rdev %d\n", typestr, (int)attr->va_mode, (int)attr->va_uid, (int)attr->va_gid, (int)attr->va_fsid, (int)attr->va_rdev)); myprintf((" fileid %d nlink %d size %d blocksize %d bytes %d\n", (int)attr->va_fileid, (int)attr->va_nlink, (int)attr->va_size, (int)attr->va_blocksize,(int)attr->va_bytes)); myprintf((" gen %ld flags %ld vaflags %d\n", attr->va_gen, attr->va_flags, attr->va_vaflags)); myprintf((" atime sec %d nsec %d\n", (int)attr->va_atime.tv_sec, (int)attr->va_atime.tv_nsec)); myprintf((" mtime sec %d nsec %d\n", (int)attr->va_mtime.tv_sec, (int)attr->va_mtime.tv_nsec)); myprintf((" ctime sec %d nsec %d\n", (int)attr->va_ctime.tv_sec, (int)attr->va_ctime.tv_nsec)); } /* How to print a ucred */ void print_cred(kauth_cred_t cred) { uint16_t ngroups; int i; myprintf(("ref %d\tuid %d\n", kauth_cred_getrefcnt(cred), kauth_cred_geteuid(cred))); ngroups = kauth_cred_ngroups(cred); for (i=0; i < ngroups; i++) myprintf(("\tgroup %d: (%d)\n", i, kauth_cred_group(cred, i))); myprintf(("\n")); } /* * Return a vnode for the given fid. * If no cnode exists for this fid create one and put it * in a table hashed by coda_f2i(). If the cnode for * this fid is already in the table return it (ref count is * incremented by coda_find. The cnode will be flushed from the * table when coda_inactive calls coda_unsave. */ struct cnode * make_coda_node(CodaFid *fid, struct mount *vfsp, short type) { struct cnode *cp; int err; if ((cp = coda_find(fid)) == NULL) { struct vnode *vp; cp = coda_alloc(); cp->c_fid = *fid; err = getnewvnode(VT_CODA, vfsp, coda_vnodeop_p, &vp); if (err) { panic("coda: getnewvnode returned error %d", err); } vp->v_data = cp; vp->v_type = type; cp->c_vnode = vp; uvm_vnp_setsize(vp, 0); coda_save(cp); } else { vref(CTOV(cp)); } return cp; } /* * coda_getpages may be called on a vnode which has not been opened, * e.g. to fault in pages to execute a program. In that case, we must * open the file to get the container. The vnode may or may not be * locked, and we must leave it in the same state. * XXX The protocol requires v_uobj.vmobjlock to be * held by caller, but this isn't documented in vnodeops(9) or vnode_if.src. */ int coda_getpages(void *v) { struct vop_getpages_args /* { struct vnode *a_vp; voff_t a_offset; struct vm_page **a_m; int *a_count; int a_centeridx; vm_prot_t a_access_type; int a_advice; int a_flags; } */ *ap = v; struct vnode *vp = ap->a_vp; struct cnode *cp = VTOC(vp); struct lwp *l = curlwp; kauth_cred_t cred = l->l_cred; int error, cerror; int waslocked; /* 1 if vnode lock was held on entry */ int didopen = 0; /* 1 if we opened container file */ /* * Handle a case that uvm_fault doesn't quite use yet. * See layer_vnops.c. for inspiration. */ if (ap->a_flags & PGO_LOCKED) { return EBUSY; } /* Check for control object. */ if (IS_CTL_VP(vp)) { printf("coda_getpages: control object %p\n", vp); simple_unlock(&vp->v_uobj.vmobjlock); return(EINVAL); } /* * XXX It's really not ok to be releasing the lock we get, * because we could be overlapping with another call to * getpages and drop a lock they are relying on. We need to * figure out whether getpages ever is called holding the * lock, and if we should serialize getpages calls by some * mechanism. */ waslocked = VOP_ISLOCKED(vp); /* Drop the vmobject lock. */ simple_unlock(&vp->v_uobj.vmobjlock); /* Get container file if not already present. */ if (cp->c_ovp == NULL) { /* * VOP_OPEN requires a locked vnode. We must avoid * locking the vnode if it is already locked, and * leave it in the same state on exit. */ if (waslocked == 0) { cerror = vn_lock(vp, LK_EXCLUSIVE); if (cerror) { printf("coda_getpages: can't lock vnode %p\n", vp); return cerror; } #if 0 printf("coda_getpages: locked vnode %p\n", vp); #endif } /* * Open file (causes upcall to venus). * XXX Perhaps we should not fully open the file, but * simply obtain a container file. */ /* XXX Is it ok to do this while holding the simplelock? */ cerror = VOP_OPEN(vp, FREAD, cred); if (cerror) { printf("coda_getpages: cannot open vnode %p => %d\n", vp, cerror); if (waslocked == 0) VOP_UNLOCK(vp, 0); return cerror; } #if 0 printf("coda_getpages: opened vnode %p\n", vp); #endif didopen = 1; } KASSERT(cp->c_ovp != NULL); /* Munge the arg structure to refer to the container vnode. */ ap->a_vp = cp->c_ovp; /* Get the lock on the container vnode, and call getpages on it. */ simple_lock(&ap->a_vp->v_uobj.vmobjlock); error = VCALL(ap->a_vp, VOFFSET(vop_getpages), ap); /* If we opened the vnode, we must close it. */ if (didopen) { /* * VOP_CLOSE requires a locked vnode, but we are still * holding the lock (or riding a caller's lock). */ cerror = VOP_CLOSE(vp, FREAD, cred); if (cerror != 0) /* XXX How should we handle this? */ printf("coda_getpages: closed vnode %p -> %d\n", vp, cerror); /* If we obtained a lock, drop it. */ if (waslocked == 0) VOP_UNLOCK(vp, 0); } return error; } /* * The protocol requires v_uobj.vmobjlock to be held by the caller, as * documented in vnodeops(9). XXX vnode_if.src doesn't say this. */ int coda_putpages(void *v) { struct vop_putpages_args /* { struct vnode *a_vp; voff_t a_offlo; voff_t a_offhi; int a_flags; } */ *ap = v; struct vnode *vp = ap->a_vp; struct cnode *cp = VTOC(vp); int error; /* Drop the vmobject lock. */ simple_unlock(&vp->v_uobj.vmobjlock); /* Check for control object. */ if (IS_CTL_VP(vp)) { printf("coda_putpages: control object %p\n", vp); return(EINVAL); } /* * If container object is not present, then there are no pages * to put; just return without error. This happens all the * time, apparently during discard of a closed vnode (which * trivially can't have dirty pages). */ if (cp->c_ovp == NULL) return 0; /* Munge the arg structure to refer to the container vnode. */ ap->a_vp = cp->c_ovp; /* Get the lock on the container vnode, and call putpages on it. */ simple_lock(&ap->a_vp->v_uobj.vmobjlock); error = VCALL(ap->a_vp, VOFFSET(vop_putpages), ap); return error; }