/* coda_create/vn_open remove/unlink link mkdir rmdir symlink */ /* $NetBSD: coda_vnops.c,v 1.16 1999/10/31 15:49:27 chs 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 #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; /* Definition of the vfs operation vector */ /* * Some NetBSD details: * * coda_start is called at the end of the mount syscall. * coda_init is called at boot time. */ #define ENTRY if(coda_vnop_print_entry) myprintf(("Entered %s\n",__FUNCTION__)) /* Definition of the vnode operation vector */ 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 */ /* 1.3 { &vop_select_desc, coda_select }, select */ { &vop_mmap_desc, coda_vop_error }, /* 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_blkatoff_desc, coda_vop_error }, /* blkatoff */ { &vop_valloc_desc, coda_vop_error }, /* valloc */ { &vop_vfree_desc, coda_vop_error }, /* vfree */ { &vop_truncate_desc, coda_vop_error }, /* truncate */ { &vop_update_desc, coda_vop_error }, /* update */ { &vop_seek_desc, genfs_seek }, /* seek */ { &vop_poll_desc, genfs_poll }, /* poll */ { (struct vnodeop_desc*)NULL, (int(*)(void *))NULL } }; struct vnodeopv_desc coda_vnodeop_opv_desc = { &coda_vnodeop_p, coda_vnodeop_entries }; /* Definitions of NetBSD vnodeop interfaces */ /* A generic panic: we were called with something we didn't define yet */ int coda_vop_error(void *anon) { struct vnodeop_desc **desc = (struct vnodeop_desc **)anon; myprintf(("coda_vop_error: Vnode operation %s called, but not defined.\n", (*desc)->vdesc_name)); /* panic("coda_nbsd_vop_error"); return 0; */ 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) { register int i; for(i=0;ia_vp); struct cnode *cp = VTOC(*vpp); int flag = ap->a_mode & (~O_EXCL); struct ucred *cred = ap->a_cred; struct proc *p = ap->a_p; /* locals */ int error; struct vnode *vp; dev_t dev; ino_t inode; MARK_ENTRY(CODA_OPEN_STATS); /* Check for open of control file. */ if (IS_CTL_VP(*vpp)) { /* XXX */ /* if (WRITEABLE(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((*vpp)), &cp->c_fid, flag, cred, p, &dev, &inode); if (error) return (error); if (!error) { CODADEBUG( CODA_OPEN,myprintf(("open: dev %d inode %d result %d\n", dev, inode, error)); ) } /* Translate the pair for the cache file into an inode pointer. */ error = coda_grab_vnode(dev, inode, &vp); if (error) return (error); /* We get the vnode back locked in both Mach and NetBSD. Needs unlocked */ VOP_UNLOCK(vp, 0); /* Keep a reference until the close comes in. */ vref(*vpp); /* Save the vnode pointer for the cache file. */ if (cp->c_ovp == NULL) { cp->c_ovp = vp; } else { if (cp->c_ovp != vp) panic("coda_open: cp->c_ovp != ITOV(ip)"); } cp->c_ocount++; /* Flush the attribute cached if writing the file. */ if (flag & FWRITE) { cp->c_owrite++; cp->c_flags &= ~C_VATTR; } /* Save the pair for the cache file to speed up subsequent page_read's. */ cp->c_device = dev; cp->c_inode = inode; /* Open the cache file. */ error = VOP_OPEN(vp, flag, cred, p); return(error); } /* * Close the cache file used for I/O and notify Venus. */ int coda_close(v) 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; struct ucred *cred = ap->a_cred; struct proc *p = ap->a_p; /* 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); } 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, p); /* 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; } else { vn_lock(cp->c_ovp, LK_EXCLUSIVE | LK_RETRY); VOP_CLOSE(cp->c_ovp, flag, cred, p); /* Do errors matter here? */ vput(cp->c_ovp); } if (--cp->c_ocount == 0) cp->c_ovp = NULL; if (flag & FWRITE) /* file was opened for write */ --cp->c_owrite; error = venus_close(vtomi(vp), &cp->c_fid, flag, cred, p); vrele(CTOV(cp)); CODADEBUG(CODA_CLOSE, myprintf(("close: result %d\n",error)); ) return(error); } int coda_read(v) 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, ap->a_uio->uio_procp)); } int coda_write(v) 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, ap->a_uio->uio_procp)); } int coda_rdwr(vp, uiop, rw, ioflag, cred, p) struct vnode *vp; struct uio *uiop; enum uio_rw rw; int ioflag; struct ucred *cred; struct proc *p; { /* upcall decl */ /* NOTE: container file operation!!! */ /* locals */ struct cnode *cp = VTOC(vp); struct vnode *cfvp = cp->c_ovp; int igot_internally = 0; int opened_internally = 0; int error = 0; MARK_ENTRY(CODA_RDWR_STATS); CODADEBUG(CODA_RDWR, myprintf(("coda_rdwr(%d, %p, %lu, %lld, %d)\n", rw, uiop->uio_iov->iov_base, (unsigned long) uiop->uio_resid, (long long) uiop->uio_offset, uiop->uio_segflg)); ) /* 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. */ 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))) { igot_internally = 1; error = coda_grab_vnode(cp->c_device, cp->c_inode, &cfvp); if (error) { MARK_INT_FAIL(CODA_RDWR_STATS); return(error); } /* * We get the vnode back locked in both Mach and * NetBSD. Needs unlocked */ VOP_UNLOCK(cfvp, 0); } else { opened_internally = 1; MARK_INT_GEN(CODA_OPEN_STATS); error = VOP_OPEN(vp, (rw == UIO_READ ? FREAD : FWRITE), cred, p); printf("coda_rdwr: Internally Opening %p\n", vp); 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 = (%lx.%lx.%lx), refcnt = %ld\n", cp->c_fid.Volume, cp->c_fid.Vnode, cp->c_fid.Unique, 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, p); } /* Invalidate cached attributes if writing. */ if (rw == UIO_WRITE) cp->c_flags &= ~C_VATTR; return(error); } int coda_ioctl(v) void *v; { /* true args */ struct vop_ioctl_args *ap = v; struct vnode *vp = ap->a_vp; int com = ap->a_command; caddr_t data = ap->a_data; int flag = ap->a_fflag; struct ucred *cred = ap->a_cred; struct proc *p = ap->a_p; /* 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, ((caddr_t)iap->path), p); 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, p); 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(v) 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; struct ucred *cred = ap->a_cred; struct proc *p = ap->a_p; /* 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: (%lx.%lx.%lx)\n", cp->c_fid.Volume, cp->c_fid.Vnode, cp->c_fid.Unique));}); 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, p, vap); if (!error) { CODADEBUG(CODA_GETATTR, myprintf(("getattr miss (%lx.%lx.%lx): result %d\n", cp->c_fid.Volume, cp->c_fid.Vnode, cp->c_fid.Unique, 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(v) void *v; { /* true args */ struct vop_setattr_args *ap = v; register struct vnode *vp = ap->a_vp; struct cnode *cp = VTOC(vp); register struct vattr *vap = ap->a_vap; struct ucred *cred = ap->a_cred; struct proc *p = ap->a_p; /* 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, p); if (!error) cp->c_flags &= ~C_VATTR; CODADEBUG(CODA_SETATTR, myprintf(("setattr %d\n", error)); ) return(error); } int coda_access(v) 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; struct ucred *cred = ap->a_cred; struct proc *p = ap->a_p; /* 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, p); 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(v) 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) FREE(ap->a_cnp->cn_pnbuf, M_NAMEI); return (0); } int coda_readlink(v) 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; struct ucred *cred = ap->a_cred; struct proc *p = ap->a_uio->uio_procp; /* locals */ 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, p, &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(v) void *v; { /* true args */ struct vop_fsync_args *ap = v; struct vnode *vp = ap->a_vp; struct cnode *cp = VTOC(vp); struct ucred *cred = ap->a_cred; struct proc *p = ap->a_p; /* 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, p); /* * 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, p); CODADEBUG(CODA_FSYNC, myprintf(("in fsync result %d\n",error)); ); return(error); } int coda_inactive(v) void *v; { /* XXX - at the moment, inactive doesn't look at cred, and doesn't have a proc pointer. Oops. */ /* true args */ struct vop_inactive_args *ap = v; struct vnode *vp = ap->a_vp; struct cnode *cp = VTOC(vp); struct ucred *cred __attribute__((unused)) = NULL; struct proc *p __attribute__((unused)) = curproc; /* upcall decl */ /* locals */ /* 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, %lx.%lx.%lx. vfsp %p\n", cp->c_fid.Volume, cp->c_fid.Vnode, cp->c_fid.Unique, 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 ((struct coda_mntinfo *)(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\n"); } if (IS_UNMOUNTING(cp)) { #ifdef DEBUG printf("coda_inactive: IS_UNMOUNTING use %ld: vp %p, cp %p\n", vp->v_usecount, vp, cp); if (cp->c_ovp != NULL) printf("coda_inactive: cp->ovp != NULL use %ld: vp %p, cp %p\n", vp->v_usecount, vp, cp); #endif lockmgr(&vp->v_lock, LK_RELEASE, &vp->v_interlock); } else { #ifdef OLD_DIAGNOSTIC if (CTOV(cp)->v_usecount) { panic("coda_inactive: nonzero reference count"); } if (cp->c_ovp != NULL) { panic("coda_inactive: cp->ovp != NULL"); } #endif VOP_UNLOCK(vp, 0); vgone(vp); } MARK_INT_SAT(CODA_INACTIVE_STATS); return(0); } /* * Remote file system operations having to do with directory manipulation. */ /* * It appears that in NetBSD, lookup is supposed to return the vnode locked */ int coda_lookup(v) void *v; { /* true args */ struct vop_lookup_args *ap = v; struct vnode *dvp = ap->a_dvp; struct cnode *dcp = VTOC(dvp); struct vnode **vpp = ap->a_vpp; /* * It looks as though ap->a_cnp->ni_cnd->cn_nameptr holds the rest * of the string to xlate, and that we must try to get at least * ap->a_cnp->ni_cnd->cn_namelen of those characters to macth. I * could be wrong. */ struct componentname *cnp = ap->a_cnp; struct ucred *cred = cnp->cn_cred; struct proc *p = cnp->cn_proc; /* locals */ struct cnode *cp; const char *nm = cnp->cn_nameptr; int len = cnp->cn_namelen; ViceFid VFid; int vtype; int error = 0; cnp->cn_flags &= ~PDIRUNLOCK; MARK_ENTRY(CODA_LOOKUP_STATS); CODADEBUG(CODA_LOOKUP, myprintf(("lookup: %s in %lx.%lx.%lx\n", nm, dcp->c_fid.Volume, dcp->c_fid.Vnode, dcp->c_fid.Unique));); /* 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; } if (len+1 > CODA_MAXNAMLEN) { MARK_INT_FAIL(CODA_LOOKUP_STATS); CODADEBUG(CODA_LOOKUP, myprintf(("name too long: lookup, %lx.%lx.%lx(%s)\n", dcp->c_fid.Volume, dcp->c_fid.Vnode, dcp->c_fid.Unique, nm));); *vpp = (struct vnode *)0; error = EINVAL; goto exit; } /* First try to look the file up in the cfs name cache */ /* lock the parent vnode? */ 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 we need to contact Venus */ error = venus_lookup(vtomi(dvp), &dcp->c_fid, nm, len, cred, p, &VFid, &vtype); if (error) { MARK_INT_FAIL(CODA_LOOKUP_STATS); CODADEBUG(CODA_LOOKUP, myprintf(("lookup error on %lx.%lx.%lx(%s)%d\n", dcp->c_fid.Volume, dcp->c_fid.Vnode, dcp->c_fid.Unique, nm, error));) *vpp = (struct vnode *)0; } else { MARK_INT_SAT(CODA_LOOKUP_STATS); CODADEBUG(CODA_LOOKUP, myprintf(("lookup: vol %lx vno %lx uni %lx type %o result %d\n", VFid.Volume, VFid.Vnode, VFid.Unique, vtype, error)); ) cp = make_coda_node(&VFid, dvp->v_mount, vtype); *vpp = CTOV(cp); /* enter the new vnode in the Name Cache only if the top bit isn't set */ /* And don't enter a new vnode for an invalid one! */ 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 there really shouldn't be an * error and we can make the leaf NULL and return success. Since * this is supposed to work under Mach as well as NetBSD, we're * leaving this fn wrapped. We also must tell lookup/namei that * we need to save the last component of the name. (Create will * have to free the name buffer later...lucky us...) */ 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. Unfortunately, this will * probably also lock the to-be-removed vnode, which may or may * not be a good idea. I'll have to look at the bits of * coda_remove to make sure. We'll only save the name if we did in * fact find the name, otherwise coda_remove won't have a chance * to free the pathname. */ if ((cnp->cn_nameiop == DELETE) && (cnp->cn_flags & ISLASTCN) && !error) { cnp->cn_flags |= SAVENAME; } /* * If the lookup went well, we need to (potentially?) unlock the * parent, and lock the child. We are only responsible for * checking to see if the parent is supposed to be unlocked before * we return. We must always lock the child (provided there is * one, and (the parent isn't locked or it isn't the same as the * parent.) Simple, huh? We can never leave the parent locked unless * we are ISLASTCN */ if (!error || (error == EJUSTRETURN)) { if (!(cnp->cn_flags & LOCKPARENT) || !(cnp->cn_flags & ISLASTCN)) { if ((error = VOP_UNLOCK(dvp, 0))) { return error; } cnp->cn_flags |= PDIRUNLOCK; /* * The parent is unlocked. As long as there is a child, * lock it without bothering to check anything else. */ if (*ap->a_vpp) { if ((error = vn_lock(*ap->a_vpp, LK_EXCLUSIVE))) { printf("coda_lookup: "); panic("unlocked parent but couldn't lock child"); } } } else { /* The parent is locked, and may be the same as the child */ if (*ap->a_vpp && (*ap->a_vpp != dvp)) { /* Different, go ahead and lock it. */ if ((error = vn_lock(*ap->a_vpp, LK_EXCLUSIVE))) { printf("coda_lookup: "); panic("unlocked parent but couldn't lock child"); } } } } else { /* If the lookup failed, we need to ensure that the leaf is NULL */ /* Don't change any locking? */ *ap->a_vpp = NULL; } return(error); } /*ARGSUSED*/ int coda_create(v) 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; struct ucred *cred = cnp->cn_cred; struct proc *p = cnp->cn_proc; /* locals */ int error; struct cnode *cp; const char *nm = cnp->cn_nameptr; int len = cnp->cn_namelen; ViceFid 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, p, &VFid, &attr); if (!error) { /* 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); /* 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 the parent's attr cache, the 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: (%lx.%lx.%lx), result %d\n", VFid.Volume, VFid.Vnode, VFid.Unique, error)); ) } else { *vpp = (struct vnode *)0; CODADEBUG(CODA_CREATE, myprintf(("create error %d\n", error));) } /* Locking strategy. */ /* * In NetBSD, all creates must explicitly vput their dvp's. We'll * go ahead and use the LOCKLEAF flag of the cnp argument. * However, I'm pretty sure that create must return the leaf * locked; so there is a DIAGNOSTIC check to ensure that this is * true. */ vput(dvp); if (!error) { if (cnp->cn_flags & LOCKLEAF) { if ((error = vn_lock(*ap->a_vpp, LK_EXCLUSIVE))) { printf("coda_create: "); panic("unlocked parent but couldn't lock child"); } } #ifdef OLD_DIAGNOSTIC else { printf("coda_create: LOCKLEAF not set!\n"); } #endif } /* Have to free the previously saved name */ /* * This condition is stolen from ufs_makeinode. I have no idea * why it's here, but what the hey... */ if ((cnp->cn_flags & SAVESTART) == 0) { FREE(cnp->cn_pnbuf, M_NAMEI); } return(error); } int coda_remove(v) void *v; { /* true args */ struct vop_remove_args *ap = v; struct vnode *dvp = ap->a_dvp; struct cnode *cp = VTOC(dvp); struct componentname *cnp = ap->a_cnp; struct ucred *cred = cnp->cn_cred; struct proc *p = cnp->cn_proc; /* 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 %lx.%lx.%lx\n", nm, cp->c_fid.Volume, cp->c_fid.Vnode, cp->c_fid.Unique));); /* 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, p); CODADEBUG(CODA_REMOVE, myprintf(("in remove result %d\n",error)); ) /* * Regardless of what happens, we have to unconditionally drop * locks/refs on parent and child. (I hope). This is based on * what ufs_remove seems to be doing. */ if (dvp == ap->a_vp) { vrele(ap->a_vp); } else { vput(ap->a_vp); } vput(dvp); if ((cnp->cn_flags & SAVESTART) == 0) { FREE(cnp->cn_pnbuf, M_NAMEI); } return(error); } int coda_link(v) void *v; { /* true args */ struct vop_link_args *ap = v; struct vnode *vp = ap->a_vp; struct cnode *cp = VTOC(vp); struct vnode *tdvp = ap->a_dvp; struct cnode *tdcp = VTOC(tdvp); struct componentname *cnp = ap->a_cnp; struct ucred *cred = cnp->cn_cred; struct proc *p = cnp->cn_proc; /* 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: (%lx.%lx.%lx)\n", cp->c_fid.Volume, cp->c_fid.Vnode, cp->c_fid.Unique)); myprintf(("nb_link: tdvp fid: (%lx.%lx.%lx)\n", tdcp->c_fid.Volume, tdcp->c_fid.Vnode, tdcp->c_fid.Unique)); } if (codadebug & CODADBGMSK(CODA_LINK)) { myprintf(("link: vp fid: (%lx.%lx.%lx)\n", cp->c_fid.Volume, cp->c_fid.Vnode, cp->c_fid.Unique)); myprintf(("link: tdvp fid: (%lx.%lx.%lx)\n", tdcp->c_fid.Volume, tdcp->c_fid.Vnode, tdcp->c_fid.Unique)); } /* Check for link to/from control object. */ if (IS_CTL_NAME(tdvp, nm, len) || IS_CTL_VP(vp)) { MARK_INT_FAIL(CODA_LINK_STATS); return(EACCES); } /* * According to the ufs_link operation here's the locking situation: * We enter with the thing called "dvp" (the directory) locked. * We must unconditionally drop locks on "dvp" * * We enter with the thing called "vp" (the linked-to) unlocked, * but ref'd (?) * We seem to need to lock it before calling coda_link, and * unconditionally unlock it after. */ if ((ap->a_vp != tdvp) && (error = vn_lock(ap->a_vp, LK_EXCLUSIVE))) { goto exit; } error = venus_link(vtomi(vp), &cp->c_fid, &tdcp->c_fid, nm, len, cred, p); /* Invalidate the parent's attr cache, the modification time has changed */ VTOC(tdvp)->c_flags &= ~C_VATTR; VTOC(vp)->c_flags &= ~C_VATTR; CODADEBUG(CODA_LINK, myprintf(("in link result %d\n",error)); ) exit: if (ap->a_vp != tdvp) { VOP_UNLOCK(ap->a_vp, 0); } vput(tdvp); /* Drop the name buffer if we don't need to SAVESTART */ if ((cnp->cn_flags & SAVESTART) == 0) { FREE(cnp->cn_pnbuf, M_NAMEI); } return(error); } int coda_rename(v) 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; struct ucred *cred = fcnp->cn_cred; struct proc *p = fcnp->cn_proc; /* 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_proc != tcnp->cn_proc)) { 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, p); 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(v) 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; register struct vattr *va = ap->a_vap; struct vnode **vpp = ap->a_vpp; struct ucred *cred = cnp->cn_cred; struct proc *p = cnp->cn_proc; /* locals */ int error; const char *nm = cnp->cn_nameptr; int len = cnp->cn_namelen; struct cnode *cp; ViceFid 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, p, &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: (%lx.%lx.%lx) result %d\n", VFid.Volume, VFid.Vnode, VFid.Unique, 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"); } } /* Have to free the previously saved name */ /* * ufs_mkdir doesn't check for SAVESTART before freeing the * pathname buffer, but ufs_create does. For the moment, I'll * follow their lead, but this seems like it is probably * incorrect. */ FREE(cnp->cn_pnbuf, M_NAMEI); return(error); } int coda_rmdir(v) void *v; { /* true args */ struct vop_rmdir_args *ap = v; struct vnode *dvp = ap->a_dvp; struct cnode *dcp = VTOC(dvp); struct componentname *cnp = ap->a_cnp; struct ucred *cred = cnp->cn_cred; struct proc *p = cnp->cn_proc; /* 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); } /* 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 */ /* * As a side effect of the rmdir, remove any entries for children of * the directory, especially "." and "..". */ cp = coda_nc_lookup(dcp, nm, len, cred); if (cp) coda_nc_zapParentfid(&(cp->c_fid), NOT_DOWNCALL); /* Remove the file's entry from the CODA Name Cache */ coda_nc_zapfile(dcp, nm, len); /* Invalidate the 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, p); CODADEBUG(CODA_RMDIR, myprintf(("in rmdir result %d\n", error)); ) /* * regardless of what happens, we need to drop locks/refs on the * parent and child. I think. */ if (dvp == ap->a_vp) { vrele(ap->a_vp); } else { vput(ap->a_vp); } vput(dvp); if ((cnp->cn_flags & SAVESTART) == 0) { FREE(cnp->cn_pnbuf, M_NAMEI); } return(error); } int coda_symlink(v) void *v; { /* true args */ struct vop_symlink_args *ap = v; struct vnode *tdvp = ap->a_dvp; struct cnode *tdcp = VTOC(tdvp); struct componentname *cnp = ap->a_cnp; struct vattr *tva = ap->a_vap; char *path = ap->a_target; struct ucred *cred = cnp->cn_cred; struct proc *p = cnp->cn_proc; /* locals */ int error; /* * XXX I'm assuming the following things about coda_symlink's * arguments: * t(foo) is the new name/parent/etc being created. * lname is the contents of the new symlink. */ const char *nm = cnp->cn_nameptr; int len = cnp->cn_namelen; int plen = strlen(path); /* XXX What about the vpp argument? Do we need it? */ /* * 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(tdvp, nm, len)) { MARK_INT_FAIL(CODA_SYMLINK_STATS); return(EACCES); } if (plen+1 > CODA_MAXPATHLEN) { MARK_INT_FAIL(CODA_SYMLINK_STATS); return(EINVAL); } if (len+1 > CODA_MAXNAMLEN) { MARK_INT_FAIL(CODA_SYMLINK_STATS); error = EINVAL; goto exit; } error = venus_symlink(vtomi(tdvp), &tdcp->c_fid, path, plen, nm, len, tva, cred, p); /* Invalidate the parent's attr cache, the modification time has changed */ tdcp->c_flags &= ~C_VATTR; if (!error) { struct nameidata nd; NDINIT(&nd, LOOKUP, FOLLOW|LOCKLEAF, UIO_SYSSPACE, nm, p); nd.ni_cnd.cn_cred = cred; nd.ni_loopcnt = 0; nd.ni_startdir = tdvp; nd.ni_cnd.cn_pnbuf = (char *)nm; nd.ni_cnd.cn_nameptr = nd.ni_cnd.cn_pnbuf; nd.ni_pathlen = len; vput(tdvp); error = lookup(&nd); *ap->a_vpp = nd.ni_vp; } /* * Okay, now we have to drop locks on dvp. vpp is unlocked, but * ref'd. It doesn't matter what happens in either symlink or * lookup. Furthermore, there isn't any way for (dvp == *vpp), so * we don't bother checking. */ /* vput(ap->a_dvp); released earlier */ if (*ap->a_vpp) { VOP_UNLOCK(*ap->a_vpp, 0); /* this line is new!! It is necessary because lookup() calls VOP_LOOKUP (coda_lookup) which returns vpp locked. cfs_nb_lookup merged with coda_lookup() to become coda_lookup so UNLOCK is necessary */ vrele(*ap->a_vpp); } /* * Free the name buffer */ if ((cnp->cn_flags & SAVESTART) == 0) { FREE(cnp->cn_pnbuf, M_NAMEI); } exit: CODADEBUG(CODA_SYMLINK, myprintf(("in symlink result %d\n",error)); ) return(error); } /* * Read directory entries. */ int coda_readdir(v) void *v; { /* true args */ struct vop_readdir_args *ap = v; struct vnode *vp = ap->a_vp; struct cnode *cp = VTOC(vp); register struct uio *uiop = ap->a_uio; struct ucred *cred = ap->a_cred; int *eofflag = ap->a_eofflag; off_t **cookies = ap->a_cookies; int *ncookies = ap->a_ncookies; struct proc *p = ap->a_uio->uio_procp; /* upcall decl */ /* locals */ int error = 0; MARK_ENTRY(CODA_READDIR_STATS); CODADEBUG(CODA_READDIR, myprintf(("coda_readdir(%p, %lu, %lld, %d)\n", uiop->uio_iov->iov_base, (unsigned long) uiop->uio_resid, (long long) uiop->uio_offset, uiop->uio_segflg)); ) /* 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, p); printf("coda_readdir: Internally Opening %p\n", vp); if (error) return(error); } /* Have UFS handle the call. */ CODADEBUG(CODA_READDIR, myprintf(("indirect readdir: fid = (%lx.%lx.%lx), refcnt = %ld\n",cp->c_fid.Volume, cp->c_fid.Vnode, cp->c_fid.Unique, vp->v_usecount)); ) error = VOP_READDIR(cp->c_ovp, 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, p); } } return(error); } /* * Convert from file system blocks to device blocks */ int coda_bmap(v) 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 proc *p __attribute__((unused)) = curproc; /* 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(v) void *v; { /* true args */ struct vop_strategy_args *ap = v; register struct buf *bp __attribute__((unused)) = ap->a_bp; struct proc *p __attribute__((unused)) = curproc; /* upcall decl */ /* locals */ myprintf(("coda_strategy called! ")); return(EINVAL); } int coda_reclaim(v) 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)); VTOC(vp) = NULL; return (0); } int coda_lock(v) 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 %lx.%lx.%lx\n", cp->c_fid.Volume, cp->c_fid.Vnode, cp->c_fid.Unique)); } return (lockmgr(&vp->v_lock, ap->a_flags, &vp->v_interlock)); } int coda_unlock(v) 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 %lx.%lx.%lx\n", cp->c_fid.Volume, cp->c_fid.Vnode, cp->c_fid.Unique)); } return (lockmgr(&vp->v_lock, ap->a_flags | LK_RELEASE, &vp->v_interlock)); } int coda_islocked(v) void *v; { /* true args */ struct vop_islocked_args *ap = v; ENTRY; return (lockstatus(&ap->a_vp->v_lock)); } /* How one looks up a vnode given a device/inode pair: */ int coda_grab_vnode(dev_t dev, ino_t ino, struct vnode **vpp) { /* This is like VFS_VGET() or igetinode()! */ int error; struct mount *mp; if (!(mp = devtomp(dev))) { myprintf(("coda_grab_vnode: devtomp(%d) returns NULL\n", dev)); return(ENXIO); } /* XXX - ensure that nonzero-return means failure */ error = VFS_VGET(mp,ino,vpp); if (error) { myprintf(("coda_grab_vnode: iget/vget(%d, %d) returns %p, err %d\n", dev, ino, *vpp, error)); return(ENOENT); } return(0); } void print_vattr( attr ) struct vattr *attr; { 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(cred) struct ucred *cred; { int i; myprintf(("ref %d\tuid %d\n",cred->cr_ref,cred->cr_uid)); for (i=0; i < cred->cr_ngroups; i++) myprintf(("\tgroup %d: (%d)\n",i,cred->cr_groups[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 fid.Volume and fid.Vnode. 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(fid, vfsp, type) ViceFid *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\n", err); } vp->v_data = cp; vp->v_type = type; cp->c_vnode = vp; coda_save(cp); } else { vref(CTOV(cp)); } return cp; }