Please note that diffs are not public domain; they are subject to the copyright notices on the relevant files. =================================================================== RCS file: /ftp/cvs/cvsroot/src/sys/miscfs/kernfs/kernfs_vnops.c,v rcsdiff: /ftp/cvs/cvsroot/src/sys/miscfs/kernfs/kernfs_vnops.c,v: warning: Unknown phrases like `commitid ...;' are present. retrieving revision 1.16 retrieving revision 1.50 diff -u -p -r1.16 -r1.50 --- src/sys/miscfs/kernfs/kernfs_vnops.c 1993/12/22 13:14:10 1.16 +++ src/sys/miscfs/kernfs/kernfs_vnops.c 1997/05/10 22:04:14 1.50 @@ -1,8 +1,10 @@ +/* $NetBSD: kernfs_vnops.c,v 1.50 1997/05/10 22:04:14 pk Exp $ */ + /* - * Copyright (c) 1990, 1992 Jan-Simon Pendry - * All rights reserved. + * Copyright (c) 1992, 1993 + * The Regents of the University of California. All rights reserved. * - * This code is derived from software contributed to Berkeley by + * This code is derived from software donated to Berkeley by * Jan-Simon Pendry. * * Redistribution and use in source and binary forms, with or without @@ -15,8 +17,8 @@ * documentation and/or other materials provided with the distribution. * 3. All advertising materials mentioning features or use of this software * must display the following acknowledgement: - * This product includes software developed by the University of - * California, Berkeley and its contributors. + * This product includes software developed by the University of + * California, Berkeley and its contributors. * 4. 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. @@ -33,787 +35,704 @@ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. * - * $Id: kernfs_vnops.c,v 1.16 1993/12/22 13:14:10 cgd Exp $ + * @(#)kernfs_vnops.c 8.9 (Berkeley) 6/15/94 */ /* - * Kernel parameter filesystem + * Kernel parameter filesystem (/kern) */ #include #include #include +#include #include #include #include -#include #include +#include +#include #include #include #include #include +#include +#include -#include /* For readdir() XXX */ - +#include #include -struct kernfs_target kernfs_targets[] = { +#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|S_IRUSR|S_IRGRP|S_IROTH) +#define DIR_MODE (S_IRUSR|S_IXUSR|S_IRGRP|S_IXGRP|S_IROTH|S_IXOTH) + +struct kern_target kern_targets[] = { /* NOTE: The name must be less than UIO_MX-16 chars in length */ -DIR_TARGET(".", 0, KTT_NULL, KTM_DIR_PERMS ) -DIR_TARGET("..", 0, KTT_NULL, KTM_DIR_PERMS ) -REG_TARGET("copyright", copyright, KTT_STRING, KTM_RO_PERMS ) -REG_TARGET("hostname", 0, KTT_HOSTNAME, KTM_RW_PERMS ) -REG_TARGET("hz", &hz, KTT_INT, KTM_RO_PERMS ) -REG_TARGET("loadavg", 0, KTT_AVENRUN, KTM_RO_PERMS ) -REG_TARGET("physmem", &physmem, KTT_INT, KTM_RO_PERMS ) -#ifdef KERNFS_HAVE_ROOTDIR -DIR_TARGET("root", 0, KTT_NULL, KTM_DIR_PERMS ) -#endif -BLK_TARGET("rootdev", 0, KTT_NULL, KTM_RO_PERMS ) -CHR_TARGET("rrootdev", 0, KTT_NULL, KTM_RO_PERMS ) -REG_TARGET("time", 0, KTT_TIME, KTM_RO_PERMS ) -REG_TARGET("version", version, KTT_STRING, KTM_RO_PERMS ) +#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("copyright"), copyright, KTT_STRING, VREG, READ_MODE }, + { DT_REG, N("hostname"), 0, KTT_HOSTNAME, 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("msgbuf"), 0, KTT_MSGBUF, VREG, READ_MODE }, + { DT_REG, N("pagesize"), &cnt.v_page_size, KTT_INT, VREG, READ_MODE }, + { DT_REG, N("physmem"), &physmem, 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("version"), version, KTT_STRING, VREG, READ_MODE }, +#undef N }; +static int nkern_targets = sizeof(kern_targets) / sizeof(kern_targets[0]); -static int nkernfs_targets = sizeof(kernfs_targets) / sizeof(kernfs_targets[0]); +int kernfs_lookup __P((void *)); +#define kernfs_create genfs_eopnotsupp +#define kernfs_mknod genfs_eopnotsupp +#define kernfs_open genfs_nullop +#define kernfs_close genfs_nullop +int kernfs_access __P((void *)); +int kernfs_getattr __P((void *)); +int kernfs_setattr __P((void *)); +int kernfs_read __P((void *)); +int kernfs_write __P((void *)); +#define kernfs_ioctl genfs_eopnotsupp +#define kernfs_poll genfs_poll +#define kernfs_mmap genfs_eopnotsupp +#define kernfs_fsync genfs_nullop +#define kernfs_seek genfs_nullop +#define kernfs_remove genfs_eopnotsupp +int kernfs_link __P((void *)); +#define kernfs_rename genfs_eopnotsupp +#define kernfs_mkdir genfs_eopnotsupp +#define kernfs_rmdir genfs_eopnotsupp +int kernfs_symlink __P((void *)); +int kernfs_readdir __P((void *)); +#define kernfs_readlink genfs_eopnotsupp +#define kernfs_abortop genfs_abortop +int kernfs_inactive __P((void *)); +int kernfs_reclaim __P((void *)); +#define kernfs_lock genfs_nullop +#define kernfs_unlock genfs_nullop +#define kernfs_bmap genfs_badop +#define kernfs_strategy genfs_badop +int kernfs_print __P((void *)); +#define kernfs_islocked genfs_nullop +int kernfs_pathconf __P((void *)); +#define kernfs_advlock genfs_eopnotsupp +#define kernfs_blkatoff genfs_eopnotsupp +#define kernfs_valloc genfs_eopnotsupp +#define kernfs_vfree genfs_nullop +#define kernfs_truncate genfs_eopnotsupp +#define kernfs_update genfs_nullop +#define kernfs_bwrite genfs_eopnotsupp + +int kernfs_xread __P((struct kern_target *, int, char **, int)); +int kernfs_xwrite __P((struct kern_target *, char *, int)); + +int (**kernfs_vnodeop_p) __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_mmap_desc, kernfs_mmap }, /* mmap */ + { &vop_fsync_desc, kernfs_fsync }, /* fsync */ + { &vop_seek_desc, kernfs_seek }, /* seek */ + { &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, kernfs_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_blkatoff_desc, kernfs_blkatoff }, /* blkatoff */ + { &vop_valloc_desc, kernfs_valloc }, /* valloc */ + { &vop_vfree_desc, kernfs_vfree }, /* vfree */ + { &vop_truncate_desc, kernfs_truncate }, /* truncate */ + { &vop_update_desc, kernfs_update }, /* update */ + { &vop_bwrite_desc, kernfs_bwrite }, /* bwrite */ + { (struct vnodeop_desc*)NULL, (int(*) __P((void *)))NULL } +}; +struct vnodeopv_desc kernfs_vnodeop_opv_desc = + { &kernfs_vnodeop_p, kernfs_vnodeop_entries }; -static int -kernfs_xread(kt, buf, len, lenp) - struct kernfs_target *kt; - char *buf; +int +kernfs_xread(kt, off, bufp, len) + struct kern_target *kt; + int off; + char **bufp; int len; - int *lenp; { - int xlen; switch (kt->kt_tag) { case KTT_TIME: { struct timeval tv; + microtime(&tv); - sprintf(buf, "%d %d\n", tv.tv_sec, tv.tv_usec); + sprintf(*bufp, "%ld %ld\n", tv.tv_sec, tv.tv_usec); break; } case KTT_INT: { int *ip = kt->kt_data; - sprintf(buf, "%d\n", *ip); + + sprintf(*bufp, "%d\n", *ip); break; } case KTT_STRING: { char *cp = kt->kt_data; - int xlen = strlen(cp) + 1; - - if (xlen >= len) - return (EINVAL); - bcopy(cp, buf, xlen); + *bufp = cp; break; } + case KTT_MSGBUF: { + extern struct msgbuf *msgbufp; + long n; + + if (off >= MSG_BSIZE) + return (0); + n = msgbufp->msg_bufx + off; + if (n >= MSG_BSIZE) + n -= MSG_BSIZE; + len = min(MSG_BSIZE - n, MSG_BSIZE - off); + *bufp = msgbufp->msg_bufc + n; + return (len); + } + case KTT_HOSTNAME: { char *cp = hostname; int xlen = hostnamelen; - if (xlen + 2 > len) /* extra space for null and newline */ + if (xlen >= (len-2)) return (EINVAL); - bcopy(cp, buf, xlen); /* safer than sprintf */ - buf[xlen] = '\n'; - buf[xlen+1] = '\0'; + bcopy(cp, *bufp, xlen); + (*bufp)[xlen] = '\n'; + (*bufp)[xlen+1] = '\0'; break; } case KTT_AVENRUN: - sprintf(buf, "%d %d %d %d\n", - averunnable.ldavg[0], - averunnable.ldavg[1], - averunnable.ldavg[2], - FSCALE); + averunnable.fscale = FSCALE; + sprintf(*bufp, "%d %d %d %ld\n", + averunnable.ldavg[0], averunnable.ldavg[1], + averunnable.ldavg[2], averunnable.fscale); break; default: - return (EINVAL); + return (0); } - *lenp = strlen(buf); - return (0); + len = strlen(*bufp); + if (len <= off) + return (0); + *bufp += off; + return (len - off); } -static int +int kernfs_xwrite(kt, buf, len) - struct kernfs_target *kt; + struct kern_target *kt; char *buf; int len; { + switch (kt->kt_tag) { - case KTT_HOSTNAME: { + case KTT_HOSTNAME: if (buf[len-1] == '\n') --len; bcopy(buf, hostname, len); - /* kernfs_write set buf[value_passed_as_len] = \0. - * therefore, buf len (hostnamelen) = len. - */ + hostname[len] = '\0'; hostnamelen = len; - hostname[hostnamelen] = '\0'; /* null end of string. */ return (0); - } default: return (EIO); } } + /* * vp is the current namei directory * ndp is the name to locate in that directory... */ -kernfs_lookup(dvp, ndp, p) - struct vnode *dvp; - struct nameidata *ndp; - struct proc *p; +int +kernfs_lookup(v) + void *v; { - char *pname = ndp->ni_ptr; - int error = ENOENT; - int i; + 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; + const char *pname = cnp->cn_nameptr; + struct kern_target *kt; struct vnode *fvp; + int error, i; #ifdef KERNFS_DIAGNOSTIC + printf("kernfs_lookup(%x)\n", ap); + printf("kernfs_lookup(dp = %x, vpp = %x, cnp = %x)\n", dvp, vpp, ap->a_cnp); printf("kernfs_lookup(%s)\n", pname); #endif - if (ndp->ni_namelen == 1 && *pname == '.') { - ndp->ni_dvp = dvp; - ndp->ni_vp = dvp; + + *vpp = NULLVP; + + if (cnp->cn_nameiop == DELETE || cnp->cn_nameiop == RENAME) + return (EROFS); + + if (cnp->cn_namelen == 1 && *pname == '.') { + *vpp = dvp; VREF(dvp); /*VOP_LOCK(dvp);*/ return (0); } -#ifdef KERNFS_HAVE_ROOTDIR - if (ndp->ni_namelen == 4 && bcmp(pname, "root", 4) == 0) { - ndp->ni_dvp = dvp; - ndp->ni_vp = rootdir; +#if 0 + if (cnp->cn_namelen == 4 && bcmp(pname, "root", 4) == 0) { + *vpp = rootdir; VREF(rootdir); VOP_LOCK(rootdir); return (0); } #endif - /* - * /kern/rootdev is the root device - */ - if (ndp->ni_namelen == 7 && bcmp(pname, "rootdev", 7) == 0) { - if (!rootvp) { - error = ENOENT; - goto bad; - } - ndp->ni_dvp = dvp; - ndp->ni_vp = rootvp; - VREF(rootvp); - VOP_LOCK(rootvp); - return (0); - } - - /* - * /kern/rrootdev is the raw root device - */ - if (ndp->ni_namelen == 8 && bcmp(pname, "rrootdev", 7) == 0) { - if (!rrootdevvp) { - error = ENOENT; - goto bad; - } - ndp->ni_dvp = dvp; - ndp->ni_vp = rrootdevvp; - VREF(rrootdevvp); - VOP_LOCK(rrootdevvp); - return (0); - } - - for (i = 0; i < nkernfs_targets; i++) { - struct kernfs_target *kt = &kernfs_targets[i]; - if (ndp->ni_namelen == strlen(kt->kt_name) && - bcmp(kt->kt_name, pname, ndp->ni_namelen) == 0) { - error = 0; - break; - } + for (kt = kern_targets, i = 0; i < nkern_targets; kt++, i++) { + if (cnp->cn_namelen == kt->kt_namlen && + bcmp(kt->kt_name, pname, cnp->cn_namelen) == 0) + goto found; } #ifdef KERNFS_DIAGNOSTIC - printf("kernfs_lookup: i = %d, error = %d\n", i, error); + printf("kernfs_lookup: i = %d, failed", i); #endif - if (error) - goto bad; + return (cnp->cn_nameiop == LOOKUP ? ENOENT : EROFS); + +found: + if (kt->kt_tag == KTT_DEVICE) { + dev_t *dp = kt->kt_data; + loop: + if (*dp == NODEV || !vfinddev(*dp, kt->kt_vtype, &fvp)) + return (ENOENT); + *vpp = fvp; + if (vget(fvp, 1)) + goto loop; + return (0); + } #ifdef KERNFS_DIAGNOSTIC printf("kernfs_lookup: allocate new vnode\n"); #endif - error = getnewvnode(VT_KERNFS, dvp->v_mount, &kernfs_vnodeops, &fvp); + error = getnewvnode(VT_KERNFS, dvp->v_mount, kernfs_vnodeop_p, &fvp); if (error) - goto bad; - VTOKERN(fvp)->kf_kt = &kernfs_targets[i]; - fvp->v_type = VTOKERN(fvp)->kf_kt->kt_vtype; - ndp->ni_dvp = dvp; - ndp->ni_vp = fvp; + return (error); + + MALLOC(fvp->v_data, void *, sizeof(struct kernfs_node), M_TEMP, + M_WAITOK); + VTOKERN(fvp)->kf_kt = kt; + fvp->v_type = kt->kt_vtype; + *vpp = fvp; + #ifdef KERNFS_DIAGNOSTIC printf("kernfs_lookup: newvp = %x\n", fvp); #endif return (0); - -bad:; - ndp->ni_dvp = dvp; - ndp->ni_vp = NULL; -#ifdef KERNFS_DIAGNOSTIC - printf("kernfs_lookup: error = %d\n", error); -#endif - return (error); } -kernfs_open(vp, mode, cred, p) - struct vnode *vp; - int mode; - struct ucred *cred; - struct proc *p; +int +kernfs_access(v) + void *v; { - /* if access succeeded, this always does, too */ - - return (0); -} + 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 mode; -/* - * Check mode permission on target pointer. Mode is READ, WRITE or EXEC. - * The mode is shifted to select the owner/group/other fields. The - * super user is granted all permissions. - */ -kernfs_access(vp, mode, cred, p) - struct vnode *vp; - register int mode; - struct ucred *cred; - struct proc *p; -{ - struct kernfs_target *kt = VTOKERN(vp)->kf_kt; - register gid_t *gp; - int i, error; - -#ifdef KERN_DIAGNOSTIC - if (!VOP_ISLOCKED(vp)) { - vprint("kernfs_access: not locked", vp); - panic("kernfs_access: not locked"); - } -#endif - /* - * If you're the super-user, you always get access. - */ - if (cred->cr_uid == 0) - return (0); - /* - * Access check is based on only one of owner, group, public. - * If not owner, then check group. If not a member of the - * group, then check public access. - */ - if (cred->cr_uid != /* kt->kt_uid XXX */ 0) { - mode >>= 3; - gp = cred->cr_groups; - for (i = 0; i < cred->cr_ngroups; i++, gp++) - if (/* kt->kt_gid XXX */ 0 == *gp) - goto found; - mode >>= 3; -found: - ; + if (vp->v_flag & VROOT) { + mode = DIR_MODE; + } else { + struct kern_target *kt = VTOKERN(vp)->kf_kt; + mode = kt->kt_mode; } - if ((kt->kt_perms & mode) == mode) - return (0); - return (EACCES); + + return (vaccess(vp->v_type, mode, (uid_t)0, (gid_t)0, ap->a_mode, + ap->a_cred)); } -kernfs_getattr(vp, vap, cred, p) - struct vnode *vp; - struct vattr *vap; - struct ucred *cred; - struct proc *p; +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; + struct timeval tv; int error = 0; - char strbuf[KSTRING]; - struct kernfs_target *kt = VTOKERN(vp)->kf_kt; + char strbuf[KSTRING], *buf; bzero((caddr_t) vap, sizeof(*vap)); vattr_null(vap); - vap->va_uid = kt->kt_uid; - vap->va_gid = kt->kt_gid; + vap->va_uid = 0; + vap->va_gid = 0; vap->va_fsid = vp->v_mount->mnt_stat.f_fsid.val[0]; - /* vap->va_qsize = 0; */ + vap->va_size = 0; vap->va_blocksize = DEV_BSIZE; - microtime(&vap->va_atime); + microtime(&tv); + TIMEVAL_TO_TIMESPEC(&tv, &vap->va_atime); vap->va_mtime = vap->va_atime; vap->va_ctime = vap->va_ctime; vap->va_gen = 0; vap->va_flags = 0; vap->va_rdev = 0; - /* vap->va_qbytes = 0; */ vap->va_bytes = 0; - vap->va_type = kt->kt_vtype; - vap->va_mode = kt->kt_perms; if (vp->v_flag & VROOT) { #ifdef KERNFS_DIAGNOSTIC printf("kernfs_getattr: stat rootdir\n"); #endif + vap->va_type = VDIR; + vap->va_mode = DIR_MODE; vap->va_nlink = 2; vap->va_fileid = 2; vap->va_size = DEV_BSIZE; } else { + 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 + vap->va_type = kt->kt_vtype; + vap->va_mode = kt->kt_mode; vap->va_nlink = 1; - vap->va_fileid = 3 + (kt - kernfs_targets) / sizeof(*kt); - error = kernfs_xread(kt, strbuf, sizeof(strbuf), &vap->va_size); + 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; } - vp->v_type = vap->va_type; #ifdef KERNFS_DIAGNOSTIC printf("kernfs_getattr: return error %d\n", error); #endif return (error); } - -/* - * Change the mode on a file. - */ -kernfs_chmod1(vp, mode, p) - register struct vnode *vp; - register int mode; - struct proc *p; +/*ARGSUSED*/ +int +kernfs_setattr(v) + void *v; { - register struct ucred *cred = p->p_ucred; - register struct kernfs_target *kt = VTOKERN(vp)->kf_kt; - int error; - - if ((mode & kt->kt_maxperms) != mode) /* can't set ro var to rw */ - return (EPERM); - - if (cred->cr_uid != kt->kt_uid && - (error = suser(cred, &p->p_acflag))) - return (error); - if (cred->cr_uid) { - if (vp->v_type != VDIR && (mode & S_ISVTX)) - return (EFTYPE); - if (!groupmember(kt->kt_gid, cred) && (mode & S_ISGID)) - return (EPERM); - } - kt->kt_perms &= ~07777; - kt->kt_perms |= mode & 07777; -/* ip->i_flag |= ICHG;*/ - return (0); -} - -/* - * Perform chown operation on kernfs_target kt - */ -kernfs_chown1(vp, uid, gid, p) - register struct vnode *vp; - uid_t uid; - gid_t gid; - struct proc *p; -{ - register struct kernfs_target *kt = VTOKERN(vp)->kf_kt; - register struct ucred *cred = p->p_ucred; - uid_t ouid; - gid_t ogid; - int error = 0; - - if (uid == (u_short)VNOVAL) - uid = kt->kt_uid; - if (gid == (u_short)VNOVAL) - gid = kt->kt_gid; /* - * If we don't own the file, are trying to change the owner - * of the file, or are not a member of the target group, - * the caller must be superuser or the call fails. + * 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. */ - if ((cred->cr_uid != kt->kt_uid || uid != kt->kt_uid || - !groupmember((gid_t)gid, cred)) && - (error = suser(cred, &p->p_acflag))) - return (error); - ouid = kt->kt_uid; - ogid = kt->kt_gid; - - kt->kt_uid = uid; - kt->kt_gid = gid; - -/* if (ouid != uid || ogid != gid) - ip->i_flag |= ICHG;*/ - if (ouid != uid && cred->cr_uid != 0) - kt->kt_perms &= ~S_ISUID; - if (ogid != gid && cred->cr_uid != 0) - kt->kt_perms &= ~S_ISGID; return (0); } -/* - * Set attribute vnode op. called from several syscalls - */ -kernfs_setattr(vp, vap, cred, p) - struct vnode *vp; - struct vattr *vap; - struct ucred *cred; - struct proc *p; +int +kernfs_read(v) + void *v; { - int error = 0; + 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; + struct kern_target *kt; + char strbuf[KSTRING], *buf; + int off, len; + int error; - /* - * Check for unsetable attributes. - */ - if ((vap->va_type != VNON) || (vap->va_nlink != VNOVAL) || - (vap->va_fsid != VNOVAL) || (vap->va_fileid != VNOVAL) || - (vap->va_blocksize != VNOVAL) || (vap->va_rdev != VNOVAL) || - ((int)vap->va_bytes != VNOVAL) || (vap->va_gen != VNOVAL)) { - return (EINVAL); - } - /* - * Go through the fields and update iff not VNOVAL. - */ - if (vap->va_uid != (u_short)VNOVAL || vap->va_gid != (u_short)VNOVAL) - if (error = kernfs_chown1(vp, vap->va_uid, vap->va_gid, p)) - return (error); - if (vap->va_size != VNOVAL) { - if (vp->v_type == VDIR) - return (EISDIR); - /* else just nod and smile... */ - } - if (vap->va_atime.tv_sec != VNOVAL || vap->va_mtime.tv_sec != VNOVAL) { -/* if (cred->cr_uid != ip->i_uid && - (error = suser(cred, &p->p_acflag))) - return (error); - if (vap->va_atime.tv_sec != VNOVAL) - ip->i_flag |= IACC; - if (vap->va_mtime.tv_sec != VNOVAL) - ip->i_flag |= IUPD; - ip->i_flag |= ICHG; - if (error = iupdat(ip, &vap->va_atime, &vap->va_mtime, 1)) - return (error); -*/ - } - if (vap->va_mode != (u_short)VNOVAL) - error = kernfs_chmod1(vp, (int)vap->va_mode, p); - if (vap->va_flags != VNOVAL) { -/* if (cred->cr_uid != ip->i_uid && - (error = suser(cred, &p->p_acflag))) - return (error); - if (cred->cr_uid == 0) { - ip->i_flags = vap->va_flags; - } else { - ip->i_flags &= 0xffff0000; - ip->i_flags |= (vap->va_flags & 0xffff); - } - ip->i_flag |= ICHG; -*/ - } - return (error); -} + if (vp->v_type == VDIR) + return (EOPNOTSUPP); + + kt = VTOKERN(vp)->kf_kt; -static int -kernfs_read(vp, uio, ioflag, cred) - struct vnode *vp; - struct uio *uio; - int ioflag; - struct ucred *cred; -{ - struct kernfs_target *kt = VTOKERN(vp)->kf_kt; - char strbuf[KSTRING]; - int off = uio->uio_offset; - int len = 0; - char *cp = strbuf; - int error; #ifdef KERNFS_DIAGNOSTIC printf("kern_read %s\n", kt->kt_name); #endif - error = kernfs_xread(kt, strbuf, sizeof(strbuf), &len); - if (error) - return (error); - cp = strbuf + off; - len -= off; - return (uiomove(cp, len, uio)); + 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); } -static int -kernfs_write(vp, uio, ioflag, cred) - struct vnode *vp; - struct uio *uio; - int ioflag; - struct ucred *cred; +int +kernfs_write(v) + void *v; { - struct kernfs_target *kt = VTOKERN(vp)->kf_kt; + 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; + struct kern_target *kt; + int error, xlen; char strbuf[KSTRING]; - int len = uio->uio_resid; - char *cp = strbuf; - int xlen; - int error; + + if (vp->v_type == VDIR) + return (EOPNOTSUPP); + + kt = VTOKERN(vp)->kf_kt; if (uio->uio_offset != 0) return (EINVAL); xlen = min(uio->uio_resid, KSTRING-1); - error = uiomove(strbuf, xlen, uio); - if (error) + 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)); } -kernfs_readdir(vp, uio, cred, eofflagp, cookies, ncookies) - struct vnode *vp; - struct uio *uio; - struct ucred *cred; - int *eofflagp; - u_int *cookies; - int ncookies; +int +kernfs_readdir(v) + void *v; { - struct filedesc *fdp; + 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; + struct uio *uio = ap->a_uio; + struct dirent d; + struct kern_target *kt; int i; int error; + u_long *cookies = ap->a_cookies; + int ncookies = ap->a_ncookies; + + if (ap->a_vp->v_type != VDIR) + return (ENOTDIR); + + if (uio->uio_resid < UIO_MX) + return (EINVAL); + if (uio->uio_offset < 0) + return (EINVAL); - i = uio->uio_offset / UIO_MX; error = 0; - while (uio->uio_resid > 0 && (!cookies || ncookies > 0)) { + i = uio->uio_offset; + bzero((caddr_t)&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 (i >= nkernfs_targets) { - *eofflagp = 1; - break; - } - { - struct direct d; - struct direct *dp = &d; - struct kernfs_target *kt = &kernfs_targets[i]; - - bzero((caddr_t) dp, UIO_MX); - - dp->d_namlen = strlen(kt->kt_name); - bcopy(kt->kt_name, dp->d_name, dp->d_namlen+1); - -#ifdef KERNFS_DIAGNOSTIC - printf("kernfs_readdir: name = %s, len = %d\n", - dp->d_name, dp->d_namlen); -#endif - /* - * Fill in the remaining fields - */ - dp->d_reclen = UIO_MX; - dp->d_ino = i + 3; - /* - * And ship to userland - */ - error = uiomove((caddr_t) dp, UIO_MX, uio); - if (error) - break; - if (cookies) { - *cookies = (i + 1) * UIO_MX; - ncookies--; - } + + 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; } - i++; - } - uio->uio_offset = i * UIO_MX; + 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((caddr_t)&d, UIO_MX, uio)) != 0) + break; + if (ncookies-- > 0) + *cookies++ = i + 1; + } + uio->uio_offset = i; return (error); } -kernfs_inactive(vp, p) - struct vnode *vp; - struct proc *p; +int +kernfs_inactive(v) + void *v; { + struct vop_inactive_args /* { + struct vnode *a_vp; + } */ *ap = v; + struct vnode *vp = ap->a_vp; + +#ifdef KERNFS_DIAGNOSTIC + printf("kernfs_inactive(%x)\n", vp); +#endif /* * Clear out the v_type field to avoid * nasty things happening in vgone(). */ vp->v_type = VNON; -#ifdef KERNFS_DIAGNOSTIC - printf("kernfs_inactive(%x)\n", vp); -#endif return (0); } -/* - * Print out the contents of a kernfs vnode. - */ -/* ARGSUSED */ int -kernfs_print(vp) - struct vnode *vp; +kernfs_reclaim(v) + void *v; { - printf("tag VT_KERNFS, kernfs vnode\n"); + struct vop_reclaim_args /* { + struct vnode *a_vp; + } */ *ap = v; + struct vnode *vp = ap->a_vp; + +#ifdef KERNFS_DIAGNOSTIC + printf("kernfs_reclaim(%x)\n", vp); +#endif + if (vp->v_data) { + FREE(vp->v_data, M_TEMP); + vp->v_data = 0; + } return (0); } /* - * kernfs vnode unsupported operation + * Return POSIX pathconf information applicable to special devices. */ -kernfs_enotsupp() +int +kernfs_pathconf(v) + void *v; { - return (EOPNOTSUPP); + 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 */ } /* - * kernfs "should never get here" operation + * Print out the contents of a /dev/fd vnode. */ -kernfs_badop() +/* ARGSUSED */ +int +kernfs_print(v) + void *v; { - panic("kernfs: bad op"); - /* NOTREACHED */ + + printf("tag VT_KERNFS, kernfs vnode\n"); + return (0); } -/* - * kernfs vnode null operation - */ -kernfs_nullop() +int +kernfs_link(v) + void *v; { - return (0); + 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); } -#define kernfs_create ((int (*) __P(( \ - struct nameidata *ndp, \ - struct vattr *vap, \ - struct proc *p))) kernfs_enotsupp) -#define kernfs_mknod ((int (*) __P(( \ - struct nameidata *ndp, \ - struct vattr *vap, \ - struct ucred *cred, \ - struct proc *p))) kernfs_enotsupp) -#define kernfs_close ((int (*) __P(( \ - struct vnode *vp, \ - int fflag, \ - struct ucred *cred, \ - struct proc *p))) nullop) -#define kernfs_ioctl ((int (*) __P(( \ - struct vnode *vp, \ - int command, \ - caddr_t data, \ - int fflag, \ - struct ucred *cred, \ - struct proc *p))) kernfs_enotsupp) -#define kernfs_select ((int (*) __P(( \ - struct vnode *vp, \ - int which, \ - int fflags, \ - struct ucred *cred, \ - struct proc *p))) kernfs_enotsupp) -#define kernfs_mmap ((int (*) __P(( \ - struct vnode *vp, \ - int fflags, \ - struct ucred *cred, \ - struct proc *p))) kernfs_enotsupp) -#define kernfs_fsync ((int (*) __P(( \ - struct vnode *vp, \ - int fflags, \ - struct ucred *cred, \ - int waitfor, \ - struct proc *p))) nullop) -#define kernfs_seek ((int (*) __P(( \ - struct vnode *vp, \ - off_t oldoff, \ - off_t newoff, \ - struct ucred *cred))) nullop) -#define kernfs_remove ((int (*) __P(( \ - struct nameidata *ndp, \ - struct proc *p))) kernfs_enotsupp) -#define kernfs_link ((int (*) __P(( \ - struct vnode *vp, \ - struct nameidata *ndp, \ - struct proc *p))) kernfs_enotsupp) -#define kernfs_rename ((int (*) __P(( \ - struct nameidata *fndp, \ - struct nameidata *tdnp, \ - struct proc *p))) kernfs_enotsupp) -#define kernfs_mkdir ((int (*) __P(( \ - struct nameidata *ndp, \ - struct vattr *vap, \ - struct proc *p))) kernfs_enotsupp) -#define kernfs_rmdir ((int (*) __P(( \ - struct nameidata *ndp, \ - struct proc *p))) kernfs_enotsupp) -#define kernfs_symlink ((int (*) __P(( \ - struct nameidata *ndp, \ - struct vattr *vap, \ - char *target, \ - struct proc *p))) kernfs_enotsupp) -#define kernfs_readlink ((int (*) __P(( \ - struct vnode *vp, \ - struct uio *uio, \ - struct ucred *cred))) kernfs_enotsupp) -#define kernfs_abortop ((int (*) __P(( \ - struct nameidata *ndp))) nullop) -#ifdef KERNFS_DIAGNOSTIC -int kernfs_reclaim(vp) -struct vnode *vp; +int +kernfs_symlink(v) + void *v; { - printf("kernfs_reclaim(%x)\n", vp); - return (0); + 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); } -#else -#define kernfs_reclaim ((int (*) __P(( \ - struct vnode *vp))) nullop) -#endif -#define kernfs_lock ((int (*) __P(( \ - struct vnode *vp))) nullop) -#define kernfs_unlock ((int (*) __P(( \ - struct vnode *vp))) nullop) -#define kernfs_bmap ((int (*) __P(( \ - struct vnode *vp, \ - daddr_t bn, \ - struct vnode **vpp, \ - daddr_t *bnp))) kernfs_badop) -#define kernfs_strategy ((int (*) __P(( \ - struct buf *bp))) kernfs_badop) -#define kernfs_islocked ((int (*) __P(( \ - struct vnode *vp))) nullop) -#define kernfs_advlock ((int (*) __P(( \ - struct vnode *vp, \ - caddr_t id, \ - int op, \ - struct flock *fl, \ - int flags))) kernfs_enotsupp) - -struct vnodeops kernfs_vnodeops = { - kernfs_lookup, /* lookup */ - kernfs_create, /* create */ - kernfs_mknod, /* mknod */ - kernfs_open, /* open */ - kernfs_close, /* close */ - kernfs_access, /* access */ - kernfs_getattr, /* getattr */ - kernfs_setattr, /* setattr */ - kernfs_read, /* read */ - kernfs_write, /* write */ - kernfs_ioctl, /* ioctl */ - kernfs_select, /* select */ - kernfs_mmap, /* mmap */ - kernfs_fsync, /* fsync */ - kernfs_seek, /* seek */ - kernfs_remove, /* remove */ - kernfs_link, /* link */ - kernfs_rename, /* rename */ - kernfs_mkdir, /* mkdir */ - kernfs_rmdir, /* rmdir */ - kernfs_symlink, /* symlink */ - kernfs_readdir, /* readdir */ - kernfs_readlink, /* readlink */ - kernfs_abortop, /* abortop */ - kernfs_inactive, /* inactive */ - kernfs_reclaim, /* reclaim */ - kernfs_lock, /* lock */ - kernfs_unlock, /* unlock */ - kernfs_bmap, /* bmap */ - kernfs_strategy, /* strategy */ - kernfs_print, /* print */ - kernfs_islocked, /* islocked */ - kernfs_advlock, /* advlock */ -};