/* $OpenBSD: kernfs_vnops.c,v 1.40 2004/06/24 19:35:24 tholo Exp $ */ /* $NetBSD: kernfs_vnops.c,v 1.43 1996/03/16 23:52:47 christos Exp $ */ /* * Copyright (c) 1992, 1993 * The Regents of the University of California. All rights reserved. * * This code is derived from software donated to Berkeley by * Jan-Simon Pendry. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * 3. Neither the name of the University nor the names of its contributors * may be used to endorse or promote products derived from this software * without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. * * @(#)kernfs_vnops.c 8.9 (Berkeley) 6/15/94 */ /* * Kernel parameter filesystem (/kern) */ #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #define KSTRING 256 /* Largest I/O available via this filesystem */ #define UIO_MX 32 #define READ_MODE (S_IRUSR|S_IRGRP|S_IROTH) #define WRITE_MODE (S_IWUSR|READ_MODE) #define DIR_MODE (S_IRUSR|S_IXUSR|S_IRGRP|S_IXGRP|S_IROTH|S_IXOTH) static int byteorder = BYTE_ORDER; static int posix = _POSIX_VERSION; static int osrev = OpenBSD; extern int ncpus; extern char machine[], cpu_model[]; #ifdef IPSEC extern int ipsp_kern(int, char **, int); #endif const struct kern_target kern_targets[] = { /* NOTE: The name must be less than UIO_MX-16 chars in length */ #define N(s) sizeof(s)-1, s /* name data tag type ro/rw */ { DT_DIR, N("."), 0, KTT_NULL, VDIR, DIR_MODE }, { DT_DIR, N(".."), 0, KTT_NULL, VDIR, DIR_MODE }, { DT_REG, N("boottime"), &boottime.tv_sec, KTT_INT, VREG, READ_MODE }, { DT_REG, N("byteorder"), &byteorder, KTT_INT, VREG, READ_MODE }, { DT_REG, N("copyright"), (void*)copyright,KTT_STRING, VREG, READ_MODE }, { DT_REG, N("hostname"), 0, KTT_HOSTNAME, VREG, WRITE_MODE }, { DT_REG, N("domainname"),0, KTT_DOMAIN, VREG, WRITE_MODE }, { DT_REG, N("hz"), &hz, KTT_INT, VREG, READ_MODE }, { DT_REG, N("loadavg"), 0, KTT_AVENRUN, VREG, READ_MODE }, { DT_REG, N("machine"), machine, KTT_STRING, VREG, READ_MODE }, { DT_REG, N("model"), cpu_model, KTT_STRING, VREG, READ_MODE }, { DT_REG, N("msgbuf"), 0, KTT_MSGBUF, VREG, READ_MODE }, { DT_REG, N("ncpu"), &ncpus, KTT_INT, VREG, READ_MODE }, { DT_REG, N("ostype"), (void*)&ostype,KTT_STRING, VREG, READ_MODE }, { DT_REG, N("osrelease"), (void*)&osrelease,KTT_STRING,VREG, READ_MODE }, { DT_REG, N("osrev"), &osrev, KTT_INT, VREG, READ_MODE }, { DT_REG, N("pagesize"), &uvmexp.pagesize, KTT_INT, VREG, READ_MODE }, { DT_REG, N("physmem"), &physmem, KTT_PHYSMEM, VREG, READ_MODE }, { DT_REG, N("posix"), &posix, KTT_INT, VREG, READ_MODE }, #if 0 { DT_DIR, N("root"), 0, KTT_NULL, VDIR, DIR_MODE }, #endif { DT_BLK, N("rootdev"), &rootdev, KTT_DEVICE, VBLK, READ_MODE }, { DT_CHR, N("rrootdev"), &rrootdev, KTT_DEVICE, VCHR, READ_MODE }, { DT_REG, N("time"), 0, KTT_TIME, VREG, READ_MODE }, { DT_REG, N("usermem"), 0, KTT_USERMEM, VREG, READ_MODE }, { DT_REG, N("version"), (void*)version,KTT_STRING, VREG, READ_MODE }, #ifdef IPSEC { DT_REG, N("ipsec"), 0, KTT_IPSECSPI, VREG, READ_MODE }, #endif #undef N }; static const int nkern_targets = sizeof(kern_targets) / sizeof(kern_targets[0]); int kernfs_badop(void *); int kernfs_lookup(void *); #define kernfs_create eopnotsupp #define kernfs_mknod eopnotsupp int kernfs_open(void *); #define kernfs_close nullop int kernfs_access(void *); int kernfs_getattr(void *); int kernfs_setattr(void *); int kernfs_read(void *); int kernfs_write(void *); #define kernfs_ioctl (int (*)(void *))enoioctl #define kernfs_mmap eopnotsupp #define kernfs_fsync nullop #define kernfs_seek nullop #define kernfs_remove eopnotsupp int kernfs_link(void *); #define kernfs_rename eopnotsupp #define kernfs_revoke vop_generic_revoke #define kernfs_mkdir eopnotsupp #define kernfs_rmdir eopnotsupp int kernfs_symlink(void *); int kernfs_readdir(void *); #define kernfs_readlink eopnotsupp int kernfs_inactive(void *); int kernfs_reclaim(void *); #define kernfs_lock vop_generic_lock #define kernfs_unlock vop_generic_unlock #define kernfs_bmap kernfs_badop #define kernfs_strategy kernfs_badop int kernfs_print(void *); #define kernfs_islocked vop_generic_islocked int kernfs_pathconf(void *); #define kernfs_advlock eopnotsupp #define kernfs_blkatoff eopnotsupp #define kernfs_valloc eopnotsupp int kernfs_vfree(void *); #define kernfs_truncate eopnotsupp #define kernfs_update eopnotsupp #define kernfs_bwrite eopnotsupp int kernfs_xread(const struct kern_target *, int, char **, int); int kernfs_xwrite(const struct kern_target *, char *, int); int kernfs_freevp(struct vnode *, struct proc *); int (**kernfs_vnodeop_p)(void *); struct vnodeopv_entry_desc kernfs_vnodeop_entries[] = { { &vop_default_desc, vn_default_error }, { &vop_lookup_desc, kernfs_lookup }, /* lookup */ { &vop_create_desc, kernfs_create }, /* create */ { &vop_mknod_desc, kernfs_mknod }, /* mknod */ { &vop_open_desc, kernfs_open }, /* open */ { &vop_close_desc, kernfs_close }, /* close */ { &vop_access_desc, kernfs_access }, /* access */ { &vop_getattr_desc, kernfs_getattr }, /* getattr */ { &vop_setattr_desc, kernfs_setattr }, /* setattr */ { &vop_read_desc, kernfs_read }, /* read */ { &vop_write_desc, kernfs_write }, /* write */ { &vop_ioctl_desc, kernfs_ioctl }, /* ioctl */ { &vop_poll_desc, kernfs_poll }, /* poll */ { &vop_revoke_desc, kernfs_revoke }, /* revoke */ { &vop_fsync_desc, kernfs_fsync }, /* fsync */ { &vop_remove_desc, kernfs_remove }, /* remove */ { &vop_link_desc, kernfs_link }, /* link */ { &vop_rename_desc, kernfs_rename }, /* rename */ { &vop_mkdir_desc, kernfs_mkdir }, /* mkdir */ { &vop_rmdir_desc, kernfs_rmdir }, /* rmdir */ { &vop_symlink_desc, kernfs_symlink }, /* symlink */ { &vop_readdir_desc, kernfs_readdir }, /* readdir */ { &vop_readlink_desc, kernfs_readlink },/* readlink */ { &vop_abortop_desc, vop_generic_abortop }, /* abortop */ { &vop_inactive_desc, kernfs_inactive },/* inactive */ { &vop_reclaim_desc, kernfs_reclaim }, /* reclaim */ { &vop_lock_desc, kernfs_lock }, /* lock */ { &vop_unlock_desc, kernfs_unlock }, /* unlock */ { &vop_bmap_desc, kernfs_bmap }, /* bmap */ { &vop_strategy_desc, kernfs_strategy },/* strategy */ { &vop_print_desc, kernfs_print }, /* print */ { &vop_islocked_desc, kernfs_islocked },/* islocked */ { &vop_pathconf_desc, kernfs_pathconf },/* pathconf */ { &vop_advlock_desc, kernfs_advlock }, /* advlock */ { &vop_bwrite_desc, kernfs_bwrite }, /* bwrite */ { NULL, NULL } }; struct vnodeopv_desc kernfs_vnodeop_opv_desc = { &kernfs_vnodeop_p, kernfs_vnodeop_entries }; TAILQ_HEAD(, kernfs_node) kfshead; static struct lock kfscache_lock; int kernfs_init(vfsp) struct vfsconf *vfsp; { lockinit(&kfscache_lock, PVFS, "kfs", 0, 0); TAILQ_INIT(&kfshead); return(0); } int kernfs_allocvp(kt, mp, vpp) const struct kern_target *kt; struct mount *mp; struct vnode **vpp; { struct proc *p = curproc; struct kernfs_node *kf; struct vnode *vp; int error = 0; #ifdef KERNFS_DIAGNOSTIC /* this should never happen */ if (kt == NULL) panic("kernfs_allocvp passed NULL kt, mp %p, vpp %p!", mp, vpp); printf("kernfs_allocvp: looking for %s\n", kt->kt_name); #endif if ((error = lockmgr(&kfscache_lock, LK_EXCLUSIVE, NULL, p)) != 0) return(error); loop: for (kf = TAILQ_FIRST(&kfshead); kf != NULL; kf = TAILQ_NEXT(kf, list)) { vp = KERNTOV(kf); if (vp->v_mount == mp && kt->kt_namlen == kf->kf_namlen && bcmp(kf->kf_name, kt->kt_name, kt->kt_namlen) == 0) { #ifdef KERNFS_DIAGNOSTIC printf("kernfs_allocvp: hit %s\n", kt->kt_name); #endif if (vget(vp, 0, p)) goto loop; *vpp = vp; goto out; } } MALLOC(kf, void *, sizeof(struct kernfs_node), M_TEMP, M_WAITOK); error = getnewvnode(VT_KERNFS, mp, kernfs_vnodeop_p, vpp); if (error) { FREE(kf, M_TEMP); goto out; } vp = *vpp; kf->kf_kt = kt; kf->kf_vnode = vp; vp->v_type = kf->kf_vtype; vp->v_data = kf; if (kf->kf_namlen == 1 && bcmp(kf->kf_name, ".", 1) == 0) vp->v_flag |= VROOT; TAILQ_INSERT_TAIL(&kfshead, kf, list); out: lockmgr(&kfscache_lock, LK_RELEASE, NULL, p); #ifdef KERNFS_DIAGNOSTIC if (error) printf("kernfs_allocvp: error %d\n", error); #endif return(error); } int kernfs_freevp(vp, p) struct vnode *vp; struct proc *p; { struct kernfs_node *kf = VTOKERN(vp); TAILQ_REMOVE(&kfshead, kf, list); FREE(vp->v_data, M_TEMP); vp->v_data = 0; return(0); } const struct kern_target * kernfs_findtarget(name, namlen) char *name; int namlen; { const struct kern_target *kt = NULL; int i; for (i = 0; i < nkern_targets; i++) { if (kern_targets[i].kt_namlen == namlen && bcmp(kern_targets[i].kt_name, name, namlen) == 0) { kt = &kern_targets[i]; break; } } #ifdef KERNFS_DIAGNOSTIC if (i == nkern_targets || kt == NULL) printf("kernfs_findtarget: no match for %s\n", name); #endif return(kt); } int kernfs_xread(kt, off, bufp, len) const struct kern_target *kt; int off; char **bufp; int len; { switch (kt->kt_tag) { case KTT_TIME: { struct timeval tv; microtime(&tv); snprintf(*bufp, len, "%ld %ld\n", tv.tv_sec, tv.tv_usec); break; } case KTT_INT: { int *ip = kt->kt_data; snprintf(*bufp, len, "%d\n", *ip); break; } case KTT_STRING: { char *cp = kt->kt_data; size_t end = strlen(cp); if (end && cp[end - 1] != '\n') { strlcpy(*bufp, cp, len - 1); strlcat(*bufp, "\n", len); } else *bufp = cp; break; } case KTT_MSGBUF: { extern struct msgbuf *msgbufp; long n; if (msgbufp == NULL || msgbufp->msg_magic != MSG_MAGIC) return (ENXIO); /* * Note that reads of /kern/msgbuf won't necessarily yield * consistent results, if the message buffer is modified * while the read is in progress. The worst that can happen * is that incorrect data will be read. There's no way * that this can crash the system unless the values in the * message buffer header are corrupted, but that'll cause * the system to die anyway. */ if (msgbufp->msg_bufl < msgbufp->msg_bufs) { if (off >= msgbufp->msg_bufx) return (0); n = off; len = msgbufp->msg_bufx - n; } else { if (off >= msgbufp->msg_bufs) return (0); n = msgbufp->msg_bufx + off; if (n >= msgbufp->msg_bufs) n -= msgbufp->msg_bufs; len = min(msgbufp->msg_bufs - n, msgbufp->msg_bufs - off); } *bufp = msgbufp->msg_bufc + n; return (len); } case KTT_HOSTNAME: { char *cp = hostname; int xlen = hostnamelen; if (xlen >= (len-2)) return (EINVAL); bcopy(cp, *bufp, xlen); (*bufp)[xlen] = '\n'; (*bufp)[xlen+1] = '\0'; break; } case KTT_DOMAIN: { char *cp = domainname; int xlen = domainnamelen; if (xlen >= (len-2)) return (EINVAL); bcopy(cp, *bufp, xlen); (*bufp)[xlen] = '\n'; (*bufp)[xlen+1] = '\0'; break; } case KTT_AVENRUN: averunnable.fscale = FSCALE; snprintf(*bufp, len, "%d %d %d %ld\n", averunnable.ldavg[0], averunnable.ldavg[1], averunnable.ldavg[2], averunnable.fscale); break; case KTT_USERMEM: snprintf(*bufp, len, "%u\n", ctob(physmem - uvmexp.wired)); break; case KTT_PHYSMEM: snprintf(*bufp, len, "%u\n", ctob(physmem)); break; #ifdef IPSEC case KTT_IPSECSPI: return(ipsp_kern(off, bufp, len)); #endif default: return (0); } len = strlen(*bufp); if (len <= off) return (0); *bufp += off; return (len - off); } int kernfs_xwrite(kt, buf, len) const struct kern_target *kt; char *buf; int len; { switch (kt->kt_tag) { case KTT_DOMAIN: if (buf[len-1] == '\n') --len; bcopy(buf, domainname, len); domainname[len] = '\0'; domainnamelen = len; return (0); case KTT_HOSTNAME: if (buf[len-1] == '\n') --len; bcopy(buf, hostname, len); hostname[len] = '\0'; hostnamelen = len; return (0); default: return (EIO); } } /* * vp is the current namei directory * ndp is the name to locate in that directory... */ int kernfs_lookup(v) void *v; { struct vop_lookup_args /* { struct vnode * a_dvp; struct vnode ** a_vpp; struct componentname * a_cnp; } */ *ap = v; struct componentname *cnp = ap->a_cnp; struct vnode **vpp = ap->a_vpp; struct vnode *dvp = ap->a_dvp; char *pname = cnp->cn_nameptr; struct proc *p = cnp->cn_proc; const struct kern_target *kt; struct vnode *vp; int error, wantpunlock; #ifdef KERNFS_DIAGNOSTIC printf("kernfs_lookup(%p)\n", ap); printf("kernfs_lookup(dp = %p, vpp = %p, cnp = %p)\n", dvp, vpp, ap->a_cnp); printf("kernfs_lookup(%s)\n", pname); #endif *vpp = NULLVP; cnp->cn_flags &= ~PDIRUNLOCK; if (cnp->cn_nameiop == DELETE || cnp->cn_nameiop == RENAME) return (EROFS); if (cnp->cn_namelen == 1 && *pname == '.') { *vpp = dvp; VREF(dvp); return (0); } wantpunlock = (~cnp->cn_flags & (LOCKPARENT | ISLASTCN)); kt = kernfs_findtarget(pname, cnp->cn_namelen); if (kt == NULL) { /* not found */ return(cnp->cn_nameiop == LOOKUP ? ENOENT : EROFS); } if (kt->kt_tag == KTT_DEVICE) { dev_t *dp = kt->kt_data; loop: if (*dp == NODEV || !vfinddev(*dp, kt->kt_vtype, &vp)) return(ENOENT); *vpp = vp; if (vget(vp, LK_EXCLUSIVE, p)) goto loop; if (wantpunlock) { VOP_UNLOCK(dvp, 0, p); cnp->cn_flags |= PDIRUNLOCK; } return(0); } if ((error = kernfs_allocvp(kt, dvp->v_mount, vpp)) != 0) { return(error); } vn_lock(*vpp, LK_EXCLUSIVE | LK_RETRY, p); if (wantpunlock) { VOP_UNLOCK(dvp, 0, p); cnp->cn_flags |= PDIRUNLOCK; } return (0); } /*ARGSUSED*/ int kernfs_open(v) void *v; { /* Only need to check access permissions. */ return (0); } int kernfs_access(v) void *v; { struct vop_access_args /* { struct vnode *a_vp; int a_mode; struct ucred *a_cred; struct proc *a_p; } */ *ap = v; struct vnode *vp = ap->a_vp; mode_t fmode = (vp->v_flag & VROOT) ? DIR_MODE : VTOKERN(vp)->kf_mode; return (vaccess(fmode, (uid_t)0, (gid_t)0, ap->a_mode, ap->a_cred)); } int kernfs_getattr(v) void *v; { struct vop_getattr_args /* { struct vnode *a_vp; struct vattr *a_vap; struct ucred *a_cred; struct proc *a_p; } */ *ap = v; struct vnode *vp = ap->a_vp; struct vattr *vap = ap->a_vap; int error = 0; char strbuf[KSTRING], *buf; bzero(vap, sizeof(*vap)); vattr_null(vap); vap->va_uid = 0; vap->va_gid = 0; vap->va_fsid = vp->v_mount->mnt_stat.f_fsid.val[0]; vap->va_size = 0; vap->va_blocksize = DEV_BSIZE; getnanotime(&vap->va_atime); vap->va_mtime = vap->va_atime; vap->va_ctime = vap->va_atime; vap->va_gen = 0; vap->va_flags = 0; vap->va_rdev = 0; vap->va_bytes = 0; if (vp->v_flag & VROOT) { #ifdef KERNFS_DIAGNOSTIC struct kern_target *kt = VTOKERN(vp)->kf_kt; printf("kernfs_getattr: stat rootdir (%s)\n", kt->kt_name); #endif vap->va_type = VDIR; vap->va_mode = DIR_MODE; vap->va_nlink = 2; vap->va_fileid = 2; vap->va_size = DEV_BSIZE; } else { const struct kern_target *kt = VTOKERN(vp)->kf_kt; int nbytes, total; #ifdef KERNFS_DIAGNOSTIC printf("kernfs_getattr: stat target %s\n", kt->kt_name); #endif if (kt == &kern_targets[2]) { /* set boottime times to boottime */ TIMEVAL_TO_TIMESPEC(&boottime, &vap->va_atime); vap->va_mtime = vap->va_atime; vap->va_ctime = vap->va_atime; } vap->va_type = kt->kt_vtype; vap->va_mode = kt->kt_mode; vap->va_nlink = 1; vap->va_fileid = 3 + (kt - kern_targets); total = 0; while (buf = strbuf, nbytes = kernfs_xread(kt, total, &buf, sizeof(strbuf))) total += nbytes; vap->va_size = total; } #ifdef KERNFS_DIAGNOSTIC printf("kernfs_getattr: return error %d\n", error); #endif return (error); } /*ARGSUSED*/ int kernfs_setattr(v) void *v; { struct vop_setattr_args /* { struct vnode *a_vp; struct vattr *a_vap; struct ucred *a_cred; struct proc *a_p; } */ *ap = v; if (ap->a_vap->va_flags != VNOVAL) return (EOPNOTSUPP); /* * Silently ignore attribute changes. * This allows for open with truncate to have no * effect until some data is written. I want to * do it this way because all writes are atomic. */ return (0); } int kernfs_read(v) void *v; { struct vop_read_args /* { struct vnode *a_vp; struct uio *a_uio; int a_ioflag; struct ucred *a_cred; } */ *ap = v; struct vnode *vp = ap->a_vp; struct uio *uio = ap->a_uio; const struct kern_target *kt; char strbuf[KSTRING], *buf; int off, len; int error; if (vp->v_type == VDIR) return (EOPNOTSUPP); kt = VTOKERN(vp)->kf_kt; #ifdef KERNFS_DIAGNOSTIC printf("kern_read %s\n", kt->kt_name); #endif off = uio->uio_offset; #if 0 while (buf = strbuf, #else if (buf = strbuf, #endif len = kernfs_xread(kt, off, &buf, sizeof(strbuf))) { if ((error = uiomove(buf, len, uio)) != 0) return (error); off += len; } return (0); } int kernfs_write(v) void *v; { struct vop_write_args /* { struct vnode *a_vp; struct uio *a_uio; int a_ioflag; struct ucred *a_cred; } */ *ap = v; struct vnode *vp = ap->a_vp; struct uio *uio = ap->a_uio; const struct kern_target *kt; int error, xlen; char strbuf[KSTRING]; if (vp->v_type == VDIR) return (EOPNOTSUPP); kt = VTOKERN(vp)->kf_kt; #ifdef KERNFS_DIAGNOSTIC printf("kernfs_write %s\n", kt->kt_name); #endif if (uio->uio_offset != 0) return (EINVAL); xlen = min(uio->uio_resid, KSTRING-1); if ((error = uiomove(strbuf, xlen, uio)) != 0) return (error); if (uio->uio_resid != 0) return (EIO); strbuf[xlen] = '\0'; xlen = strlen(strbuf); return (kernfs_xwrite(kt, strbuf, xlen)); } int kernfs_readdir(v) void *v; { struct vop_readdir_args /* { struct vnode *a_vp; struct uio *a_uio; struct ucred *a_cred; int *a_eofflag; u_long *a_cookies; int a_ncookies; } */ *ap = v; int error, i; struct uio *uio = ap->a_uio; struct dirent d; const struct kern_target *kt; if (ap->a_vp->v_type != VDIR) return (ENOTDIR); if (uio->uio_resid < UIO_MX) return (EINVAL); if (uio->uio_offset < 0) return (EINVAL); error = 0; i = uio->uio_offset; bzero(&d, UIO_MX); d.d_reclen = UIO_MX; for (kt = &kern_targets[i]; uio->uio_resid >= UIO_MX && i < nkern_targets; kt++, i++) { #ifdef KERNFS_DIAGNOSTIC printf("kernfs_readdir: i = %d\n", i); #endif if (kt->kt_tag == KTT_DEVICE) { dev_t *dp = kt->kt_data; struct vnode *fvp; if (*dp == NODEV || !vfinddev(*dp, kt->kt_vtype, &fvp)) continue; } d.d_fileno = i + 3; d.d_namlen = kt->kt_namlen; bcopy(kt->kt_name, d.d_name, kt->kt_namlen + 1); d.d_type = kt->kt_type; if ((error = uiomove(&d, UIO_MX, uio)) != 0) break; } uio->uio_offset = i; return (error); } int kernfs_inactive(v) void *v; { struct vop_inactive_args /* { struct vnode *a_vp; struct proc *a_p; } */ *ap = v; struct vnode *vp = ap->a_vp; #ifdef KERNFS_DIAGNOSTIC struct kernfs_node *kf; kf = VTOKERN(vp); printf("kernfs_inactive(%p) %s\n", vp, kf->kf_name); #endif VOP_UNLOCK(vp, 0, ap->a_p); return (0); } int kernfs_reclaim(v) void *v; { struct vop_reclaim_args /* { struct vnode *a_vp; } */ *ap = v; struct vnode *vp = ap->a_vp; struct proc *p = curproc; #ifdef KERNFS_DIAGNOSTIC struct kernfs_node *kf; kf = VTOKERN(vp); printf("kernfs_reclaim(%p) %s\n", vp, kf->kf_name); #endif return(kernfs_freevp(vp, p)); } /* * Return POSIX pathconf information applicable to special devices. */ int kernfs_pathconf(v) void *v; { struct vop_pathconf_args /* { struct vnode *a_vp; int a_name; register_t *a_retval; } */ *ap = v; switch (ap->a_name) { case _PC_LINK_MAX: *ap->a_retval = LINK_MAX; return (0); case _PC_MAX_CANON: *ap->a_retval = MAX_CANON; return (0); case _PC_MAX_INPUT: *ap->a_retval = MAX_INPUT; return (0); case _PC_PIPE_BUF: *ap->a_retval = PIPE_BUF; return (0); case _PC_CHOWN_RESTRICTED: *ap->a_retval = 1; return (0); case _PC_VDISABLE: *ap->a_retval = _POSIX_VDISABLE; return (0); default: return (EINVAL); } /* NOTREACHED */ } /* * Print out some details of a kernfs vnode. */ /* ARGSUSED */ int kernfs_print(v) void *v; { struct vop_print_args /* struct vnode *a_vp; } */ *ap = v; struct kernfs_node *kf = VTOKERN(ap->a_vp); printf("tag VT_KERNFS, kernfs vnode: name %s, vp %p, tag %d\n", kf->kf_name, kf->kf_vnode, kf->kf_tag); return (0); } /*ARGSUSED*/ int kernfs_vfree(v) void *v; { return (0); } int kernfs_link(v) void *v; { struct vop_link_args /* { struct vnode *a_dvp; struct vnode *a_vp; struct componentname *a_cnp; } */ *ap = v; VOP_ABORTOP(ap->a_dvp, ap->a_cnp); vput(ap->a_dvp); return (EROFS); } int kernfs_symlink(v) void *v; { struct vop_symlink_args /* { struct vnode *a_dvp; struct vnode **a_vpp; struct componentname *a_cnp; struct vattr *a_vap; char *a_target; } */ *ap = v; VOP_ABORTOP(ap->a_dvp, ap->a_cnp); vput(ap->a_dvp); return (EROFS); } /* * kernfs "should never get here" operation */ /*ARGSUSED*/ int kernfs_badop(v) void *v; { panic("kernfs: bad op"); return 0; } int kernfs_poll(v) void *v; { struct vop_poll_args /* { struct vnode *a_vp; int a_events; struct proc *a_p; } */ *ap = v; return (ap->a_events & (POLLIN | POLLOUT | POLLRDNORM | POLLWRNORM)); }