/* $NetBSD: vfs_syscalls.c,v 1.199 2003/10/25 01:18:01 kleink Exp $ */ /* * Copyright (c) 1989, 1993 * The Regents of the University of California. All rights reserved. * (c) UNIX System Laboratories, Inc. * All or some portions of this file are derived from material licensed * to the University of California by American Telephone and Telegraph * Co. or Unix System Laboratories, Inc. and are reproduced herein with * the permission of UNIX System Laboratories, Inc. * * 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. * * @(#)vfs_syscalls.c 8.42 (Berkeley) 7/31/95 */ #include __KERNEL_RCSID(0, "$NetBSD: vfs_syscalls.c,v 1.199 2003/10/25 01:18:01 kleink Exp $"); #include "opt_compat_netbsd.h" #include "opt_compat_43.h" #include "opt_ktrace.h" #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #ifdef KTRACE #include #endif #include #include MALLOC_DEFINE(M_MOUNT, "mount", "vfs mount struct"); static int change_dir __P((struct nameidata *, struct proc *)); static int change_flags __P((struct vnode *, u_long, struct proc *)); static int change_mode __P((struct vnode *, int, struct proc *p)); static int change_owner __P((struct vnode *, uid_t, gid_t, struct proc *, int)); static int change_utimes __P((struct vnode *vp, const struct timeval *, struct proc *p)); static int rename_files __P((const char *, const char *, struct proc *, int)); static int dostatfs __P((struct mount *, struct statfs *, struct proc *, int, int)); void checkdirs __P((struct vnode *)); int dovfsusermount = 0; /* * Virtual File System System Calls */ /* * Mount a file system. */ #if defined(COMPAT_09) || defined(COMPAT_43) /* * This table is used to maintain compatibility with 4.3BSD * and NetBSD 0.9 mount syscalls. Note, the order is important! * * Do not modify this table. It should only contain filesystems * supported by NetBSD 0.9 and 4.3BSD. */ const char * const mountcompatnames[] = { NULL, /* 0 = MOUNT_NONE */ MOUNT_FFS, /* 1 = MOUNT_UFS */ MOUNT_NFS, /* 2 */ MOUNT_MFS, /* 3 */ MOUNT_MSDOS, /* 4 */ MOUNT_CD9660, /* 5 = MOUNT_ISOFS */ MOUNT_FDESC, /* 6 */ MOUNT_KERNFS, /* 7 */ NULL, /* 8 = MOUNT_DEVFS */ MOUNT_AFS, /* 9 */ }; const int nmountcompatnames = sizeof(mountcompatnames) / sizeof(mountcompatnames[0]); #endif /* COMPAT_09 || COMPAT_43 */ /* ARGSUSED */ int sys_mount(l, v, retval) struct lwp *l; void *v; register_t *retval; { struct sys_mount_args /* { syscallarg(const char *) type; syscallarg(const char *) path; syscallarg(int) flags; syscallarg(void *) data; } */ *uap = v; struct proc *p = l->l_proc; struct vnode *vp; struct mount *mp; int error, flag = 0; char fstypename[MFSNAMELEN]; struct vattr va; struct nameidata nd; struct vfsops *vfs; if (dovfsusermount == 0 && (SCARG(uap, flags) & MNT_GETARGS) == 0 && (error = suser(p->p_ucred, &p->p_acflag))) return (error); /* * Get vnode to be covered */ NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); if ((error = namei(&nd)) != 0) return (error); vp = nd.ni_vp; /* * A lookup in VFS_MOUNT might result in an attempt to * lock this vnode again, so make the lock recursive. */ vn_lock(vp, LK_EXCLUSIVE | LK_RETRY | LK_SETRECURSE); if (SCARG(uap, flags) & (MNT_UPDATE | MNT_GETARGS)) { if ((vp->v_flag & VROOT) == 0) { vput(vp); return (EINVAL); } mp = vp->v_mount; flag = mp->mnt_flag; vfs = mp->mnt_op; /* * We only allow the filesystem to be reloaded if it * is currently mounted read-only. */ if ((SCARG(uap, flags) & MNT_RELOAD) && ((mp->mnt_flag & MNT_RDONLY) == 0)) { vput(vp); return (EOPNOTSUPP); /* Needs translation */ } /* * In "highly secure" mode, don't let the caller do anything * but downgrade a filesystem from read-write to read-only. * (see also below; MNT_UPDATE or MNT_GETARGS is required.) */ if (securelevel >= 2 && SCARG(uap, flags) != MNT_GETARGS && SCARG(uap, flags) != (mp->mnt_flag | MNT_RDONLY | MNT_RELOAD | MNT_FORCE | MNT_UPDATE)) { vput(vp); return (EPERM); } mp->mnt_flag |= SCARG(uap, flags) & (MNT_RELOAD | MNT_FORCE | MNT_UPDATE | MNT_GETARGS); /* * Only root, or the user that did the original mount is * permitted to update it. */ if ((mp->mnt_flag & MNT_GETARGS) == 0 && mp->mnt_stat.f_owner != p->p_ucred->cr_uid && (error = suser(p->p_ucred, &p->p_acflag)) != 0) { vput(vp); return (error); } /* * Do not allow NFS export by non-root users. For non-root * users, silently enforce MNT_NOSUID and MNT_NODEV, and * MNT_NOEXEC if mount point is already MNT_NOEXEC. */ if (p->p_ucred->cr_uid != 0) { if (SCARG(uap, flags) & MNT_EXPORTED) { vput(vp); return (EPERM); } SCARG(uap, flags) |= MNT_NOSUID | MNT_NODEV; if (flag & MNT_NOEXEC) SCARG(uap, flags) |= MNT_NOEXEC; } if (vfs_busy(mp, LK_NOWAIT, 0)) { vput(vp); return (EPERM); } goto update; } else { if (securelevel >= 2) { vput(vp); return (EPERM); } } /* * If the user is not root, ensure that they own the directory * onto which we are attempting to mount. */ if ((error = VOP_GETATTR(vp, &va, p->p_ucred, p)) != 0 || (va.va_uid != p->p_ucred->cr_uid && (error = suser(p->p_ucred, &p->p_acflag)) != 0)) { vput(vp); return (error); } /* * Do not allow NFS export by non-root users. For non-root users, * silently enforce MNT_NOSUID and MNT_NODEV, and MNT_NOEXEC if the * mount point is already MNT_NOEXEC. */ if (p->p_ucred->cr_uid != 0) { if (SCARG(uap, flags) & MNT_EXPORTED) { vput(vp); return (EPERM); } SCARG(uap, flags) |= MNT_NOSUID | MNT_NODEV; if (vp->v_mount->mnt_flag & MNT_NOEXEC) SCARG(uap, flags) |= MNT_NOEXEC; } if ((error = vinvalbuf(vp, V_SAVE, p->p_ucred, p, 0, 0)) != 0) return (error); if (vp->v_type != VDIR) { vput(vp); return (ENOTDIR); } error = copyinstr(SCARG(uap, type), fstypename, MFSNAMELEN, NULL); if (error) { #if defined(COMPAT_09) || defined(COMPAT_43) /* * Historically filesystem types were identified by number. * If we get an integer for the filesystem type instead of a * string, we check to see if it matches one of the historic * filesystem types. */ u_long fsindex = (u_long)SCARG(uap, type); if (fsindex >= nmountcompatnames || mountcompatnames[fsindex] == NULL) { vput(vp); return (ENODEV); } strncpy(fstypename, mountcompatnames[fsindex], MFSNAMELEN); #else vput(vp); return (error); #endif } #ifdef COMPAT_10 /* Accept `ufs' as an alias for `ffs'. */ if (!strncmp(fstypename, "ufs", MFSNAMELEN)) strncpy(fstypename, "ffs", MFSNAMELEN); #endif if ((vfs = vfs_getopsbyname(fstypename)) == NULL) { vput(vp); return (ENODEV); } if (vp->v_mountedhere != NULL) { vput(vp); return (EBUSY); } /* * Allocate and initialize the file system. */ mp = (struct mount *)malloc((u_long)sizeof(struct mount), M_MOUNT, M_WAITOK); memset((char *)mp, 0, (u_long)sizeof(struct mount)); lockinit(&mp->mnt_lock, PVFS, "vfslock", 0, 0); (void)vfs_busy(mp, LK_NOWAIT, 0); mp->mnt_op = vfs; vfs->vfs_refcount++; mp->mnt_vnodecovered = vp; mp->mnt_stat.f_owner = p->p_ucred->cr_uid; mp->mnt_unmounter = NULL; /* * The underlying file system may refuse the mount for * various reasons. Allow the user to force it to happen. */ mp->mnt_flag |= SCARG(uap, flags) & MNT_FORCE; update: /* * Set the mount level flags. */ if (SCARG(uap, flags) & MNT_RDONLY) mp->mnt_flag |= MNT_RDONLY; else if (mp->mnt_flag & MNT_RDONLY) mp->mnt_iflag |= IMNT_WANTRDWR; mp->mnt_flag &= ~(MNT_NOSUID | MNT_NOEXEC | MNT_NODEV | MNT_SYNCHRONOUS | MNT_UNION | MNT_ASYNC | MNT_NOCOREDUMP | MNT_NOATIME | MNT_NODEVMTIME | MNT_SYMPERM | MNT_SOFTDEP); mp->mnt_flag |= SCARG(uap, flags) & (MNT_NOSUID | MNT_NOEXEC | MNT_NODEV | MNT_SYNCHRONOUS | MNT_UNION | MNT_ASYNC | MNT_NOCOREDUMP | MNT_NOATIME | MNT_NODEVMTIME | MNT_SYMPERM | MNT_SOFTDEP | MNT_IGNORE); /* * Mount the filesystem. */ error = VFS_MOUNT(mp, SCARG(uap, path), SCARG(uap, data), &nd, p); if (mp->mnt_flag & (MNT_UPDATE | MNT_GETARGS)) { if (mp->mnt_iflag & IMNT_WANTRDWR) mp->mnt_flag &= ~MNT_RDONLY; if (error || (mp->mnt_flag & MNT_GETARGS)) mp->mnt_flag = flag; mp->mnt_flag &=~ (MNT_RELOAD | MNT_FORCE | MNT_UPDATE | MNT_GETARGS); mp->mnt_iflag &=~ IMNT_WANTRDWR; if ((mp->mnt_flag & (MNT_RDONLY | MNT_ASYNC)) == 0) { if (mp->mnt_syncer == NULL) error = vfs_allocate_syncvnode(mp); } else { if (mp->mnt_syncer != NULL) vfs_deallocate_syncvnode(mp); } vfs_unbusy(mp); VOP_UNLOCK(vp, 0); vrele(vp); return (error); } /* * Put the new filesystem on the mount list after root. */ cache_purge(vp); if (!error) { mp->mnt_flag &=~ (MNT_RELOAD | MNT_FORCE | MNT_UPDATE | MNT_GETARGS); mp->mnt_iflag &=~ IMNT_WANTRDWR; vp->v_mountedhere = mp; simple_lock(&mountlist_slock); CIRCLEQ_INSERT_TAIL(&mountlist, mp, mnt_list); simple_unlock(&mountlist_slock); checkdirs(vp); VOP_UNLOCK(vp, 0); if ((mp->mnt_flag & (MNT_RDONLY | MNT_ASYNC)) == 0) error = vfs_allocate_syncvnode(mp); vfs_unbusy(mp); (void) VFS_STATFS(mp, &mp->mnt_stat, p); if ((error = VFS_START(mp, 0, p))) vrele(vp); } else { vp->v_mountedhere = (struct mount *)0; vfs->vfs_refcount--; vfs_unbusy(mp); free(mp, M_MOUNT); vput(vp); } return (error); } /* * Scan all active processes to see if any of them have a current * or root directory onto which the new filesystem has just been * mounted. If so, replace them with the new mount point. */ void checkdirs(olddp) struct vnode *olddp; { struct cwdinfo *cwdi; struct vnode *newdp; struct proc *p; if (olddp->v_usecount == 1) return; if (VFS_ROOT(olddp->v_mountedhere, &newdp)) panic("mount: lost mount"); proclist_lock_read(); LIST_FOREACH(p, &allproc, p_list) { cwdi = p->p_cwdi; if (cwdi->cwdi_cdir == olddp) { vrele(cwdi->cwdi_cdir); VREF(newdp); cwdi->cwdi_cdir = newdp; } if (cwdi->cwdi_rdir == olddp) { vrele(cwdi->cwdi_rdir); VREF(newdp); cwdi->cwdi_rdir = newdp; } } proclist_unlock_read(); if (rootvnode == olddp) { vrele(rootvnode); VREF(newdp); rootvnode = newdp; } vput(newdp); } /* * Unmount a file system. * * Note: unmount takes a path to the vnode mounted on as argument, * not special file (as before). */ /* ARGSUSED */ int sys_unmount(l, v, retval) struct lwp *l; void *v; register_t *retval; { struct sys_unmount_args /* { syscallarg(const char *) path; syscallarg(int) flags; } */ *uap = v; struct proc *p = l->l_proc; struct vnode *vp; struct mount *mp; int error; struct nameidata nd; NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_USERSPACE, SCARG(uap, path), p); if ((error = namei(&nd)) != 0) return (error); vp = nd.ni_vp; mp = vp->v_mount; /* * Only root, or the user that did the original mount is * permitted to unmount this filesystem. */ if ((mp->mnt_stat.f_owner != p->p_ucred->cr_uid) && (error = suser(p->p_ucred, &p->p_acflag)) != 0) { vput(vp); return (error); } /* * Don't allow unmounting the root file system. */ if (mp->mnt_flag & MNT_ROOTFS) { vput(vp); return (EINVAL); } /* * Must be the root of the filesystem */ if ((vp->v_flag & VROOT) == 0) { vput(vp); return (EINVAL); } vput(vp); /* * XXX Freeze syncer. Must do this before locking the * mount point. See dounmount() for details. */ lockmgr(&syncer_lock, LK_EXCLUSIVE, NULL); if (vfs_busy(mp, 0, 0)) { lockmgr(&syncer_lock, LK_RELEASE, NULL); return (EBUSY); } return (dounmount(mp, SCARG(uap, flags), p)); } /* * Do the actual file system unmount. File system is assumed to have been * marked busy by the caller. */ int dounmount(mp, flags, p) struct mount *mp; int flags; struct proc *p; { struct vnode *coveredvp; int error; int async; int used_syncer; simple_lock(&mountlist_slock); vfs_unbusy(mp); used_syncer = (mp->mnt_syncer != NULL); /* * XXX Syncer must be frozen when we get here. This should really * be done on a per-mountpoint basis, but especially the softdep * code possibly called from the syncer doens't exactly work on a * per-mountpoint basis, so the softdep code would become a maze * of vfs_busy() calls. * * The caller of dounmount() must acquire syncer_lock because * the syncer itself acquires locks in syncer_lock -> vfs_busy * order, and we must preserve that order to avoid deadlock. * * So, if the file system did not use the syncer, now is * the time to release the syncer_lock. */ if (used_syncer == 0) lockmgr(&syncer_lock, LK_RELEASE, NULL); mp->mnt_iflag |= IMNT_UNMOUNT; mp->mnt_unmounter = p; lockmgr(&mp->mnt_lock, LK_DRAIN | LK_INTERLOCK, &mountlist_slock); vn_start_write(NULL, &mp, V_WAIT); if (mp->mnt_flag & MNT_EXPUBLIC) vfs_setpublicfs(NULL, NULL, NULL); async = mp->mnt_flag & MNT_ASYNC; mp->mnt_flag &= ~MNT_ASYNC; cache_purgevfs(mp); /* remove cache entries for this file sys */ if (mp->mnt_syncer != NULL) vfs_deallocate_syncvnode(mp); if (((mp->mnt_flag & MNT_RDONLY) || (error = VFS_SYNC(mp, MNT_WAIT, p->p_ucred, p)) == 0) || (flags & MNT_FORCE)) error = VFS_UNMOUNT(mp, flags, p); vn_finished_write(mp, 0); simple_lock(&mountlist_slock); if (error) { if ((mp->mnt_flag & (MNT_RDONLY | MNT_ASYNC)) == 0) (void) vfs_allocate_syncvnode(mp); mp->mnt_iflag &= ~IMNT_UNMOUNT; mp->mnt_unmounter = NULL; mp->mnt_flag |= async; lockmgr(&mp->mnt_lock, LK_RELEASE | LK_INTERLOCK | LK_REENABLE, &mountlist_slock); if (used_syncer) lockmgr(&syncer_lock, LK_RELEASE, NULL); while (mp->mnt_wcnt > 0) { wakeup(mp); tsleep(&mp->mnt_wcnt, PVFS, "mntwcnt1", 0); } return (error); } CIRCLEQ_REMOVE(&mountlist, mp, mnt_list); if ((coveredvp = mp->mnt_vnodecovered) != NULLVP) { coveredvp->v_mountedhere = NULL; vrele(coveredvp); } mp->mnt_op->vfs_refcount--; if (LIST_FIRST(&mp->mnt_vnodelist) != NULL) panic("unmount: dangling vnode"); mp->mnt_iflag |= IMNT_GONE; lockmgr(&mp->mnt_lock, LK_RELEASE | LK_INTERLOCK, &mountlist_slock); if (used_syncer) lockmgr(&syncer_lock, LK_RELEASE, NULL); while(mp->mnt_wcnt > 0) { wakeup(mp); tsleep(&mp->mnt_wcnt, PVFS, "mntwcnt2", 0); } free(mp, M_MOUNT); return (0); } /* * Sync each mounted filesystem. */ #ifdef DEBUG int syncprt = 0; struct ctldebug debug0 = { "syncprt", &syncprt }; #endif /* ARGSUSED */ int sys_sync(l, v, retval) struct lwp *l; void *v; register_t *retval; { struct mount *mp, *nmp; int asyncflag; struct proc *p = l == NULL ? &proc0 : l->l_proc; simple_lock(&mountlist_slock); for (mp = mountlist.cqh_last; mp != (void *)&mountlist; mp = nmp) { if (vfs_busy(mp, LK_NOWAIT, &mountlist_slock)) { nmp = mp->mnt_list.cqe_prev; continue; } if ((mp->mnt_flag & MNT_RDONLY) == 0 && vn_start_write(NULL, &mp, V_NOWAIT) == 0) { asyncflag = mp->mnt_flag & MNT_ASYNC; mp->mnt_flag &= ~MNT_ASYNC; VFS_SYNC(mp, MNT_NOWAIT, p->p_ucred, p); if (asyncflag) mp->mnt_flag |= MNT_ASYNC; vn_finished_write(mp, 0); } simple_lock(&mountlist_slock); nmp = mp->mnt_list.cqe_prev; vfs_unbusy(mp); } simple_unlock(&mountlist_slock); #ifdef DEBUG if (syncprt) vfs_bufstats(); #endif /* DEBUG */ return (0); } /* * Change filesystem quotas. */ /* ARGSUSED */ int sys_quotactl(l, v, retval) struct lwp *l; void *v; register_t *retval; { struct sys_quotactl_args /* { syscallarg(const char *) path; syscallarg(int) cmd; syscallarg(int) uid; syscallarg(caddr_t) arg; } */ *uap = v; struct proc *p = l->l_proc; struct mount *mp; int error; struct nameidata nd; NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); if ((error = namei(&nd)) != 0) return (error); error = vn_start_write(nd.ni_vp, &mp, V_WAIT | V_PCATCH); vrele(nd.ni_vp); if (error) return (error); error = VFS_QUOTACTL(mp, SCARG(uap, cmd), SCARG(uap, uid), SCARG(uap, arg), p); vn_finished_write(mp, 0); return (error); } static int dostatfs(struct mount *mp, struct statfs *sp, struct proc *p, int flags, int root) { struct cwdinfo *cwdi = p->p_cwdi; int error = 0; /* * If MNT_NOWAIT or MNT_LAZY is specified, do not * refresh the fsstat cache. MNT_WAIT or MNT_LAXY * overrides MNT_NOWAIT. */ if (flags == MNT_NOWAIT || flags == MNT_LAZY || (flags != MNT_WAIT && flags != 0)) { memcpy(sp, &mp->mnt_stat, sizeof(*sp)); goto done; } if ((error = VFS_STATFS(mp, sp, p)) != 0) { return error; } if (cwdi->cwdi_rdir == NULL) (void)memcpy(&mp->mnt_stat, sp, sizeof(mp->mnt_stat)); done: if (cwdi->cwdi_rdir != NULL) { size_t len; char *bp; char *path = malloc(MAXPATHLEN, M_TEMP, M_WAITOK); if (!path) return ENOMEM; bp = path + MAXPATHLEN; *--bp = '\0'; error = getcwd_common(cwdi->cwdi_rdir, rootvnode, &bp, path, MAXPATHLEN / 2, 0, p); if (error) { free(path, M_TEMP); return error; } len = strlen(bp); /* * for mount points that are below our root, we can see * them, so we fix up the pathname and return them. The * rest we cannot see, so we don't allow viewing the * data. */ if (strncmp(bp, sp->f_mntonname, len) == 0) { strlcpy(sp->f_mntonname, &sp->f_mntonname[len], sizeof(sp->f_mntonname)); if (sp->f_mntonname[0] == '\0') (void)strlcpy(sp->f_mntonname, "/", sizeof(sp->f_mntonname)); } else { if (root) (void)strlcpy(sp->f_mntonname, "/", sizeof(sp->f_mntonname)); else error = EPERM; } free(path, M_TEMP); } sp->f_flags = mp->mnt_flag & MNT_VISFLAGMASK; sp->f_oflags = sp->f_flags & 0xffff; return error; } /* * Get filesystem statistics. */ /* ARGSUSED */ int sys_statfs(l, v, retval) struct lwp *l; void *v; register_t *retval; { struct sys_statfs_args /* { syscallarg(const char *) path; syscallarg(struct statfs *) buf; } */ *uap = v; struct proc *p = l->l_proc; struct mount *mp; struct statfs sbuf; int error; struct nameidata nd; NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); if ((error = namei(&nd)) != 0) return error; mp = nd.ni_vp->v_mount; vrele(nd.ni_vp); if ((error = dostatfs(mp, &sbuf, p, 0, 1)) != 0) return error; return copyout(&sbuf, SCARG(uap, buf), sizeof(sbuf)); } /* * Get filesystem statistics. */ /* ARGSUSED */ int sys_fstatfs(l, v, retval) struct lwp *l; void *v; register_t *retval; { struct sys_fstatfs_args /* { syscallarg(int) fd; syscallarg(struct statfs *) buf; } */ *uap = v; struct proc *p = l->l_proc; struct file *fp; struct mount *mp; struct statfs sbuf; int error; /* getvnode() will use the descriptor for us */ if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) return (error); mp = ((struct vnode *)fp->f_data)->v_mount; if ((error = dostatfs(mp, &sbuf, p, 0, 1)) != 0) goto out; error = copyout(&sbuf, SCARG(uap, buf), sizeof(sbuf)); out: FILE_UNUSE(fp, p); return error; } /* * Get statistics on all filesystems. */ int sys_getfsstat(l, v, retval) struct lwp *l; void *v; register_t *retval; { struct sys_getfsstat_args /* { syscallarg(struct statfs *) buf; syscallarg(long) bufsize; syscallarg(int) flags; } */ *uap = v; int root = 0; struct proc *p = l->l_proc; struct mount *mp, *nmp; struct statfs sbuf; caddr_t sfsp; long count, maxcount, error = 0; maxcount = SCARG(uap, bufsize) / sizeof(struct statfs); sfsp = (caddr_t)SCARG(uap, buf); simple_lock(&mountlist_slock); count = 0; for (mp = CIRCLEQ_FIRST(&mountlist); mp != (void *)&mountlist; mp = nmp) { if (vfs_busy(mp, LK_NOWAIT, &mountlist_slock)) { nmp = CIRCLEQ_NEXT(mp, mnt_list); continue; } if (sfsp && count < maxcount) { error = dostatfs(mp, &sbuf, p, SCARG(uap, flags), 0); if (error) { simple_lock(&mountlist_slock); nmp = CIRCLEQ_NEXT(mp, mnt_list); vfs_unbusy(mp); continue; } error = copyout(&sbuf, sfsp, sizeof(sbuf)); if (error) { vfs_unbusy(mp); return (error); } sfsp += sizeof(sbuf); root |= strcmp(sbuf.f_mntonname, "/") == 0; } count++; simple_lock(&mountlist_slock); nmp = CIRCLEQ_NEXT(mp, mnt_list); vfs_unbusy(mp); } simple_unlock(&mountlist_slock); if (root == 0 && p->p_cwdi->cwdi_rdir) { /* * fake a root entry */ if ((error = dostatfs(p->p_cwdi->cwdi_rdir->v_mount, &sbuf, p, SCARG(uap, flags), 1)) != 0) return error; if (sfsp) error = copyout(&sbuf, sfsp, sizeof(sbuf)); count++; } if (sfsp && count > maxcount) *retval = maxcount; else *retval = count; return error; } /* * Change current working directory to a given file descriptor. */ /* ARGSUSED */ int sys_fchdir(l, v, retval) struct lwp *l; void *v; register_t *retval; { struct sys_fchdir_args /* { syscallarg(int) fd; } */ *uap = v; struct proc *p = l->l_proc; struct filedesc *fdp = p->p_fd; struct cwdinfo *cwdi = p->p_cwdi; struct vnode *vp, *tdp; struct mount *mp; struct file *fp; int error; /* getvnode() will use the descriptor for us */ if ((error = getvnode(fdp, SCARG(uap, fd), &fp)) != 0) return (error); vp = (struct vnode *)fp->f_data; VREF(vp); vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); if (vp->v_type != VDIR) error = ENOTDIR; else error = VOP_ACCESS(vp, VEXEC, p->p_ucred, p); while (!error && (mp = vp->v_mountedhere) != NULL) { if (vfs_busy(mp, 0, 0)) continue; error = VFS_ROOT(mp, &tdp); vfs_unbusy(mp); if (error) break; vput(vp); vp = tdp; } if (error) { vput(vp); goto out; } VOP_UNLOCK(vp, 0); /* * Disallow changing to a directory not under the process's * current root directory (if there is one). */ if (cwdi->cwdi_rdir && !vn_isunder(vp, NULL, p)) { vrele(vp); error = EPERM; /* operation not permitted */ goto out; } vrele(cwdi->cwdi_cdir); cwdi->cwdi_cdir = vp; out: FILE_UNUSE(fp, p); return (error); } /* * Change this process's notion of the root directory to a given file descriptor. */ int sys_fchroot(l, v, retval) struct lwp *l; void *v; register_t *retval; { struct sys_fchroot_args *uap = v; struct proc *p = l->l_proc; struct filedesc *fdp = p->p_fd; struct cwdinfo *cwdi = p->p_cwdi; struct vnode *vp; struct file *fp; int error; if ((error = suser(p->p_ucred, &p->p_acflag)) != 0) return error; /* getvnode() will use the descriptor for us */ if ((error = getvnode(fdp, SCARG(uap, fd), &fp)) != 0) return error; vp = (struct vnode *) fp->f_data; vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); if (vp->v_type != VDIR) error = ENOTDIR; else error = VOP_ACCESS(vp, VEXEC, p->p_ucred, p); VOP_UNLOCK(vp, 0); if (error) goto out; VREF(vp); /* * Prevent escaping from chroot by putting the root under * the working directory. Silently chdir to / if we aren't * already there. */ if (!vn_isunder(cwdi->cwdi_cdir, vp, p)) { /* * XXX would be more failsafe to change directory to a * deadfs node here instead */ vrele(cwdi->cwdi_cdir); VREF(vp); cwdi->cwdi_cdir = vp; } if (cwdi->cwdi_rdir != NULL) vrele(cwdi->cwdi_rdir); cwdi->cwdi_rdir = vp; out: FILE_UNUSE(fp, p); return (error); } /* * Change current working directory (``.''). */ /* ARGSUSED */ int sys_chdir(l, v, retval) struct lwp *l; void *v; register_t *retval; { struct sys_chdir_args /* { syscallarg(const char *) path; } */ *uap = v; struct proc *p = l->l_proc; struct cwdinfo *cwdi = p->p_cwdi; int error; struct nameidata nd; NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_USERSPACE, SCARG(uap, path), p); if ((error = change_dir(&nd, p)) != 0) return (error); vrele(cwdi->cwdi_cdir); cwdi->cwdi_cdir = nd.ni_vp; return (0); } /* * Change notion of root (``/'') directory. */ /* ARGSUSED */ int sys_chroot(l, v, retval) struct lwp *l; void *v; register_t *retval; { struct sys_chroot_args /* { syscallarg(const char *) path; } */ *uap = v; struct proc *p = l->l_proc; struct cwdinfo *cwdi = p->p_cwdi; struct vnode *vp; int error; struct nameidata nd; if ((error = suser(p->p_ucred, &p->p_acflag)) != 0) return (error); NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_USERSPACE, SCARG(uap, path), p); if ((error = change_dir(&nd, p)) != 0) return (error); if (cwdi->cwdi_rdir != NULL) vrele(cwdi->cwdi_rdir); vp = nd.ni_vp; cwdi->cwdi_rdir = vp; /* * Prevent escaping from chroot by putting the root under * the working directory. Silently chdir to / if we aren't * already there. */ if (!vn_isunder(cwdi->cwdi_cdir, vp, p)) { /* * XXX would be more failsafe to change directory to a * deadfs node here instead */ vrele(cwdi->cwdi_cdir); VREF(vp); cwdi->cwdi_cdir = vp; } return (0); } /* * Common routine for chroot and chdir. */ static int change_dir(ndp, p) struct nameidata *ndp; struct proc *p; { struct vnode *vp; int error; if ((error = namei(ndp)) != 0) return (error); vp = ndp->ni_vp; if (vp->v_type != VDIR) error = ENOTDIR; else error = VOP_ACCESS(vp, VEXEC, p->p_ucred, p); if (error) vput(vp); else VOP_UNLOCK(vp, 0); return (error); } /* * Check permissions, allocate an open file structure, * and call the device open routine if any. */ int sys_open(l, v, retval) struct lwp *l; void *v; register_t *retval; { struct sys_open_args /* { syscallarg(const char *) path; syscallarg(int) flags; syscallarg(int) mode; } */ *uap = v; struct proc *p = l->l_proc; struct cwdinfo *cwdi = p->p_cwdi; struct filedesc *fdp = p->p_fd; struct file *fp; struct vnode *vp; int flags, cmode; int type, indx, error; struct flock lf; struct nameidata nd; flags = FFLAGS(SCARG(uap, flags)); if ((flags & (FREAD | FWRITE)) == 0) return (EINVAL); /* falloc() will use the file descriptor for us */ if ((error = falloc(p, &fp, &indx)) != 0) return (error); cmode = ((SCARG(uap, mode) &~ cwdi->cwdi_cmask) & ALLPERMS) &~ S_ISTXT; NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); l->l_dupfd = -indx - 1; /* XXX check for fdopen */ if ((error = vn_open(&nd, flags, cmode)) != 0) { FILE_UNUSE(fp, p); ffree(fp); if ((error == ENODEV || error == ENXIO) && l->l_dupfd >= 0 && /* XXX from fdopen */ (error = dupfdopen(p, indx, l->l_dupfd, flags, error)) == 0) { *retval = indx; return (0); } if (error == ERESTART) error = EINTR; fdremove(fdp, indx); return (error); } l->l_dupfd = 0; vp = nd.ni_vp; fp->f_flag = flags & FMASK; fp->f_type = DTYPE_VNODE; fp->f_ops = &vnops; fp->f_data = vp; if (flags & (O_EXLOCK | O_SHLOCK)) { lf.l_whence = SEEK_SET; lf.l_start = 0; lf.l_len = 0; if (flags & O_EXLOCK) lf.l_type = F_WRLCK; else lf.l_type = F_RDLCK; type = F_FLOCK; if ((flags & FNONBLOCK) == 0) type |= F_WAIT; VOP_UNLOCK(vp, 0); error = VOP_ADVLOCK(vp, fp, F_SETLK, &lf, type); if (error) { (void) vn_close(vp, fp->f_flag, fp->f_cred, p); FILE_UNUSE(fp, p); ffree(fp); fdremove(fdp, indx); return (error); } vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); fp->f_flag |= FHASLOCK; } VOP_UNLOCK(vp, 0); *retval = indx; FILE_SET_MATURE(fp); FILE_UNUSE(fp, p); return (0); } /* * Get file handle system call */ int sys_getfh(l, v, retval) struct lwp *l; void *v; register_t *retval; { struct sys_getfh_args /* { syscallarg(char *) fname; syscallarg(fhandle_t *) fhp; } */ *uap = v; struct proc *p = l->l_proc; struct vnode *vp; fhandle_t fh; int error; struct nameidata nd; /* * Must be super user */ error = suser(p->p_ucred, &p->p_acflag); if (error) return (error); NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_USERSPACE, SCARG(uap, fname), p); error = namei(&nd); if (error) return (error); vp = nd.ni_vp; memset(&fh, 0, sizeof(fh)); fh.fh_fsid = vp->v_mount->mnt_stat.f_fsid; error = VFS_VPTOFH(vp, &fh.fh_fid); vput(vp); if (error) return (error); error = copyout(&fh, (caddr_t)SCARG(uap, fhp), sizeof (fh)); return (error); } /* * Open a file given a file handle. * * Check permissions, allocate an open file structure, * and call the device open routine if any. */ int sys_fhopen(l, v, retval) struct lwp *l; void *v; register_t *retval; { struct sys_fhopen_args /* { syscallarg(const fhandle_t *) fhp; syscallarg(int) flags; } */ *uap = v; struct proc *p = l->l_proc; struct filedesc *fdp = p->p_fd; struct file *fp; struct vnode *vp = NULL; struct mount *mp; struct ucred *cred = p->p_ucred; int flags; struct file *nfp; int type, indx, error=0; struct flock lf; struct vattr va; fhandle_t fh; /* * Must be super user */ if ((error = suser(p->p_ucred, &p->p_acflag))) return (error); flags = FFLAGS(SCARG(uap, flags)); if ((flags & (FREAD | FWRITE)) == 0) return (EINVAL); if ((flags & O_CREAT)) return (EINVAL); /* falloc() will use the file descriptor for us */ if ((error = falloc(p, &nfp, &indx)) != 0) return (error); fp = nfp; if ((error = copyin(SCARG(uap, fhp), &fh, sizeof(fhandle_t))) != 0) goto bad; if ((mp = vfs_getvfs(&fh.fh_fsid)) == NULL) { error = ESTALE; goto bad; } if ((error = VFS_FHTOVP(mp, &fh.fh_fid, &vp)) != 0) { vp = NULL; /* most likely unnecessary sanity for bad: */ goto bad; } /* Now do an effective vn_open */ if (vp->v_type == VSOCK) { error = EOPNOTSUPP; goto bad; } if (flags & FREAD) { if ((error = VOP_ACCESS(vp, VREAD, cred, p)) != 0) goto bad; } if (flags & (FWRITE | O_TRUNC)) { if (vp->v_type == VDIR) { error = EISDIR; goto bad; } if ((error = vn_writechk(vp)) != 0 || (error = VOP_ACCESS(vp, VWRITE, cred, p)) != 0) goto bad; } if (flags & O_TRUNC) { if ((error = vn_start_write(vp, &mp, V_WAIT | V_PCATCH)) != 0) goto bad; VOP_UNLOCK(vp, 0); /* XXX */ VOP_LEASE(vp, p, cred, LEASE_WRITE); vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); /* XXX */ VATTR_NULL(&va); va.va_size = 0; error = VOP_SETATTR(vp, &va, cred, p); vn_finished_write(mp, 0); if (error) goto bad; } if ((error = VOP_OPEN(vp, flags, cred, p)) != 0) goto bad; if (vp->v_type == VREG && uvn_attach(vp, flags & FWRITE ? VM_PROT_WRITE : 0) == NULL) { error = EIO; goto bad; } if (flags & FWRITE) vp->v_writecount++; /* done with modified vn_open, now finish what sys_open does. */ fp->f_flag = flags & FMASK; fp->f_type = DTYPE_VNODE; fp->f_ops = &vnops; fp->f_data = vp; if (flags & (O_EXLOCK | O_SHLOCK)) { lf.l_whence = SEEK_SET; lf.l_start = 0; lf.l_len = 0; if (flags & O_EXLOCK) lf.l_type = F_WRLCK; else lf.l_type = F_RDLCK; type = F_FLOCK; if ((flags & FNONBLOCK) == 0) type |= F_WAIT; VOP_UNLOCK(vp, 0); error = VOP_ADVLOCK(vp, fp, F_SETLK, &lf, type); if (error) { (void) vn_close(vp, fp->f_flag, fp->f_cred, p); FILE_UNUSE(fp, p); ffree(fp); fdremove(fdp, indx); return (error); } vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); fp->f_flag |= FHASLOCK; } VOP_UNLOCK(vp, 0); *retval = indx; FILE_SET_MATURE(fp); FILE_UNUSE(fp, p); return (0); bad: FILE_UNUSE(fp, p); ffree(fp); fdremove(fdp, indx); if (vp != NULL) vput(vp); return (error); } /* ARGSUSED */ int sys_fhstat(l, v, retval) struct lwp *l; void *v; register_t *retval; { struct sys_fhstat_args /* { syscallarg(const fhandle_t *) fhp; syscallarg(struct stat *) sb; } */ *uap = v; struct proc *p = l->l_proc; struct stat sb; int error; fhandle_t fh; struct mount *mp; struct vnode *vp; /* * Must be super user */ if ((error = suser(p->p_ucred, &p->p_acflag))) return (error); if ((error = copyin(SCARG(uap, fhp), &fh, sizeof(fhandle_t))) != 0) return (error); if ((mp = vfs_getvfs(&fh.fh_fsid)) == NULL) return (ESTALE); if ((error = VFS_FHTOVP(mp, &fh.fh_fid, &vp))) return (error); error = vn_stat(vp, &sb, p); vput(vp); if (error) return (error); error = copyout(&sb, SCARG(uap, sb), sizeof(sb)); return (error); } /* ARGSUSED */ int sys_fhstatfs(l, v, retval) struct lwp *l; void *v; register_t *retval; { struct sys_fhstatfs_args /* syscallarg(const fhandle_t *) fhp; syscallarg(struct statfs *) buf; } */ *uap = v; struct proc *p = l->l_proc; struct statfs sbuf; fhandle_t fh; struct mount *mp; struct vnode *vp; int error; /* * Must be super user */ if ((error = suser(p->p_ucred, &p->p_acflag))) return (error); if ((error = copyin(SCARG(uap, fhp), &fh, sizeof(fhandle_t))) != 0) return (error); if ((mp = vfs_getvfs(&fh.fh_fsid)) == NULL) return (ESTALE); if ((error = VFS_FHTOVP(mp, &fh.fh_fid, &vp))) return (error); mp = vp->v_mount; vput(vp); if ((error = VFS_STATFS(mp, &sbuf, p)) != 0) return (error); return (copyout(&sbuf, SCARG(uap, buf), sizeof(sbuf))); } /* * Create a special file. */ /* ARGSUSED */ int sys_mknod(l, v, retval) struct lwp *l; void *v; register_t *retval; { struct sys_mknod_args /* { syscallarg(const char *) path; syscallarg(int) mode; syscallarg(int) dev; } */ *uap = v; struct proc *p = l->l_proc; struct vnode *vp; struct mount *mp; struct vattr vattr; int error; int whiteout = 0; struct nameidata nd; if ((error = suser(p->p_ucred, &p->p_acflag)) != 0) return (error); restart: NDINIT(&nd, CREATE, LOCKPARENT, UIO_USERSPACE, SCARG(uap, path), p); if ((error = namei(&nd)) != 0) return (error); vp = nd.ni_vp; if (vp != NULL) error = EEXIST; else { VATTR_NULL(&vattr); vattr.va_mode = (SCARG(uap, mode) & ALLPERMS) &~ p->p_cwdi->cwdi_cmask; vattr.va_rdev = SCARG(uap, dev); whiteout = 0; switch (SCARG(uap, mode) & S_IFMT) { case S_IFMT: /* used by badsect to flag bad sectors */ vattr.va_type = VBAD; break; case S_IFCHR: vattr.va_type = VCHR; break; case S_IFBLK: vattr.va_type = VBLK; break; case S_IFWHT: whiteout = 1; break; default: error = EINVAL; break; } } if (vn_start_write(nd.ni_dvp, &mp, V_NOWAIT) != 0) { VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); if (nd.ni_dvp == vp) vrele(nd.ni_dvp); else vput(nd.ni_dvp); if (vp) vrele(vp); if ((error = vn_start_write(NULL, &mp, V_WAIT | V_SLEEPONLY | V_PCATCH)) != 0) return (error); goto restart; } if (!error) { VOP_LEASE(nd.ni_dvp, p, p->p_ucred, LEASE_WRITE); if (whiteout) { error = VOP_WHITEOUT(nd.ni_dvp, &nd.ni_cnd, CREATE); if (error) VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); vput(nd.ni_dvp); } else { error = VOP_MKNOD(nd.ni_dvp, &nd.ni_vp, &nd.ni_cnd, &vattr); if (error == 0) vput(nd.ni_vp); } } else { VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); if (nd.ni_dvp == vp) vrele(nd.ni_dvp); else vput(nd.ni_dvp); if (vp) vrele(vp); } vn_finished_write(mp, 0); return (error); } /* * Create a named pipe. */ /* ARGSUSED */ int sys_mkfifo(l, v, retval) struct lwp *l; void *v; register_t *retval; { struct sys_mkfifo_args /* { syscallarg(const char *) path; syscallarg(int) mode; } */ *uap = v; struct proc *p = l->l_proc; struct mount *mp; struct vattr vattr; int error; struct nameidata nd; restart: NDINIT(&nd, CREATE, LOCKPARENT, UIO_USERSPACE, SCARG(uap, path), p); if ((error = namei(&nd)) != 0) return (error); if (nd.ni_vp != NULL) { VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); if (nd.ni_dvp == nd.ni_vp) vrele(nd.ni_dvp); else vput(nd.ni_dvp); vrele(nd.ni_vp); return (EEXIST); } if (vn_start_write(nd.ni_dvp, &mp, V_NOWAIT) != 0) { VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); if (nd.ni_dvp == nd.ni_vp) vrele(nd.ni_dvp); else vput(nd.ni_dvp); if (nd.ni_vp) vrele(nd.ni_vp); if ((error = vn_start_write(NULL, &mp, V_WAIT | V_SLEEPONLY | V_PCATCH)) != 0) return (error); goto restart; } VATTR_NULL(&vattr); vattr.va_type = VFIFO; vattr.va_mode = (SCARG(uap, mode) & ALLPERMS) &~ p->p_cwdi->cwdi_cmask; VOP_LEASE(nd.ni_dvp, p, p->p_ucred, LEASE_WRITE); error = VOP_MKNOD(nd.ni_dvp, &nd.ni_vp, &nd.ni_cnd, &vattr); if (error == 0) vput(nd.ni_vp); vn_finished_write(mp, 0); return (error); } /* * Make a hard file link. */ /* ARGSUSED */ int sys_link(l, v, retval) struct lwp *l; void *v; register_t *retval; { struct sys_link_args /* { syscallarg(const char *) path; syscallarg(const char *) link; } */ *uap = v; struct proc *p = l->l_proc; struct vnode *vp; struct mount *mp; struct nameidata nd; int error; NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); if ((error = namei(&nd)) != 0) return (error); vp = nd.ni_vp; if ((error = vn_start_write(vp, &mp, V_WAIT | V_PCATCH)) != 0) { vrele(vp); return (error); } NDINIT(&nd, CREATE, LOCKPARENT, UIO_USERSPACE, SCARG(uap, link), p); if ((error = namei(&nd)) != 0) goto out; if (nd.ni_vp) { VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); if (nd.ni_dvp == nd.ni_vp) vrele(nd.ni_dvp); else vput(nd.ni_dvp); vrele(nd.ni_vp); error = EEXIST; goto out; } VOP_LEASE(nd.ni_dvp, p, p->p_ucred, LEASE_WRITE); VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); error = VOP_LINK(nd.ni_dvp, vp, &nd.ni_cnd); out: vrele(vp); vn_finished_write(mp, 0); return (error); } /* * Make a symbolic link. */ /* ARGSUSED */ int sys_symlink(l, v, retval) struct lwp *l; void *v; register_t *retval; { struct sys_symlink_args /* { syscallarg(const char *) path; syscallarg(const char *) link; } */ *uap = v; struct proc *p = l->l_proc; struct mount *mp; struct vattr vattr; char *path; int error; struct nameidata nd; path = PNBUF_GET(); error = copyinstr(SCARG(uap, path), path, MAXPATHLEN, NULL); if (error) goto out; restart: NDINIT(&nd, CREATE, LOCKPARENT, UIO_USERSPACE, SCARG(uap, link), p); if ((error = namei(&nd)) != 0) goto out; if (nd.ni_vp) { VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); if (nd.ni_dvp == nd.ni_vp) vrele(nd.ni_dvp); else vput(nd.ni_dvp); vrele(nd.ni_vp); error = EEXIST; goto out; } if (vn_start_write(nd.ni_dvp, &mp, V_NOWAIT) != 0) { VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); if (nd.ni_dvp == nd.ni_vp) vrele(nd.ni_dvp); else vput(nd.ni_dvp); if ((error = vn_start_write(NULL, &mp, V_WAIT | V_SLEEPONLY | V_PCATCH)) != 0) return (error); goto restart; } VATTR_NULL(&vattr); vattr.va_mode = ACCESSPERMS &~ p->p_cwdi->cwdi_cmask; VOP_LEASE(nd.ni_dvp, p, p->p_ucred, LEASE_WRITE); error = VOP_SYMLINK(nd.ni_dvp, &nd.ni_vp, &nd.ni_cnd, &vattr, path); if (error == 0) vput(nd.ni_vp); vn_finished_write(mp, 0); out: PNBUF_PUT(path); return (error); } /* * Delete a whiteout from the filesystem. */ /* ARGSUSED */ int sys_undelete(l, v, retval) struct lwp *l; void *v; register_t *retval; { struct sys_undelete_args /* { syscallarg(const char *) path; } */ *uap = v; struct proc *p = l->l_proc; int error; struct mount *mp; struct nameidata nd; restart: NDINIT(&nd, DELETE, LOCKPARENT|DOWHITEOUT, UIO_USERSPACE, SCARG(uap, path), p); error = namei(&nd); if (error) return (error); if (nd.ni_vp != NULLVP || !(nd.ni_cnd.cn_flags & ISWHITEOUT)) { VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); if (nd.ni_dvp == nd.ni_vp) vrele(nd.ni_dvp); else vput(nd.ni_dvp); if (nd.ni_vp) vrele(nd.ni_vp); return (EEXIST); } if (vn_start_write(nd.ni_dvp, &mp, V_NOWAIT) != 0) { VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); if (nd.ni_dvp == nd.ni_vp) vrele(nd.ni_dvp); else vput(nd.ni_dvp); if ((error = vn_start_write(NULL, &mp, V_WAIT | V_SLEEPONLY | V_PCATCH)) != 0) return (error); goto restart; } VOP_LEASE(nd.ni_dvp, p, p->p_ucred, LEASE_WRITE); if ((error = VOP_WHITEOUT(nd.ni_dvp, &nd.ni_cnd, DELETE)) != 0) VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); vput(nd.ni_dvp); vn_finished_write(mp, 0); return (error); } /* * Delete a name from the filesystem. */ /* ARGSUSED */ int sys_unlink(l, v, retval) struct lwp *l; void *v; register_t *retval; { struct sys_unlink_args /* { syscallarg(const char *) path; } */ *uap = v; struct proc *p = l->l_proc; struct mount *mp; struct vnode *vp; int error; struct nameidata nd; restart: NDINIT(&nd, DELETE, LOCKPARENT | LOCKLEAF, UIO_USERSPACE, SCARG(uap, path), p); if ((error = namei(&nd)) != 0) return (error); vp = nd.ni_vp; /* * The root of a mounted filesystem cannot be deleted. */ if (vp->v_flag & VROOT) { VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); if (nd.ni_dvp == vp) vrele(nd.ni_dvp); else vput(nd.ni_dvp); vput(vp); error = EBUSY; goto out; } if (vn_start_write(nd.ni_dvp, &mp, V_NOWAIT) != 0) { VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); if (nd.ni_dvp == vp) vrele(nd.ni_dvp); else vput(nd.ni_dvp); vput(vp); if ((error = vn_start_write(NULL, &mp, V_WAIT | V_SLEEPONLY | V_PCATCH)) != 0) return (error); goto restart; } VOP_LEASE(nd.ni_dvp, p, p->p_ucred, LEASE_WRITE); VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); error = VOP_REMOVE(nd.ni_dvp, nd.ni_vp, &nd.ni_cnd); vn_finished_write(mp, 0); out: return (error); } /* * Reposition read/write file offset. */ int sys_lseek(l, v, retval) struct lwp *l; void *v; register_t *retval; { struct sys_lseek_args /* { syscallarg(int) fd; syscallarg(int) pad; syscallarg(off_t) offset; syscallarg(int) whence; } */ *uap = v; struct proc *p = l->l_proc; struct ucred *cred = p->p_ucred; struct filedesc *fdp = p->p_fd; struct file *fp; struct vnode *vp; struct vattr vattr; off_t newoff; int error; if ((fp = fd_getfile(fdp, SCARG(uap, fd))) == NULL) return (EBADF); FILE_USE(fp); vp = (struct vnode *)fp->f_data; if (fp->f_type != DTYPE_VNODE || vp->v_type == VFIFO) { error = ESPIPE; goto out; } switch (SCARG(uap, whence)) { case SEEK_CUR: newoff = fp->f_offset + SCARG(uap, offset); break; case SEEK_END: error = VOP_GETATTR(vp, &vattr, cred, p); if (error) goto out; newoff = SCARG(uap, offset) + vattr.va_size; break; case SEEK_SET: newoff = SCARG(uap, offset); break; default: error = EINVAL; goto out; } if ((error = VOP_SEEK(vp, fp->f_offset, newoff, cred)) != 0) goto out; *(off_t *)retval = fp->f_offset = newoff; out: FILE_UNUSE(fp, p); return (error); } /* * Positional read system call. */ int sys_pread(l, v, retval) struct lwp *l; void *v; register_t *retval; { struct sys_pread_args /* { syscallarg(int) fd; syscallarg(void *) buf; syscallarg(size_t) nbyte; syscallarg(off_t) offset; } */ *uap = v; struct proc *p = l->l_proc; struct filedesc *fdp = p->p_fd; struct file *fp; struct vnode *vp; off_t offset; int error, fd = SCARG(uap, fd); if ((fp = fd_getfile(fdp, fd)) == NULL) return (EBADF); if ((fp->f_flag & FREAD) == 0) { simple_unlock(&fp->f_slock); return (EBADF); } FILE_USE(fp); vp = (struct vnode *)fp->f_data; if (fp->f_type != DTYPE_VNODE || vp->v_type == VFIFO) { error = ESPIPE; goto out; } offset = SCARG(uap, offset); /* * XXX This works because no file systems actually * XXX take any action on the seek operation. */ if ((error = VOP_SEEK(vp, fp->f_offset, offset, fp->f_cred)) != 0) goto out; /* dofileread() will unuse the descriptor for us */ return (dofileread(p, fd, fp, SCARG(uap, buf), SCARG(uap, nbyte), &offset, 0, retval)); out: FILE_UNUSE(fp, p); return (error); } /* * Positional scatter read system call. */ int sys_preadv(l, v, retval) struct lwp *l; void *v; register_t *retval; { struct sys_preadv_args /* { syscallarg(int) fd; syscallarg(const struct iovec *) iovp; syscallarg(int) iovcnt; syscallarg(off_t) offset; } */ *uap = v; struct proc *p = l->l_proc; struct filedesc *fdp = p->p_fd; struct file *fp; struct vnode *vp; off_t offset; int error, fd = SCARG(uap, fd); if ((fp = fd_getfile(fdp, fd)) == NULL) return (EBADF); if ((fp->f_flag & FREAD) == 0) { simple_unlock(&fp->f_slock); return (EBADF); } FILE_USE(fp); vp = (struct vnode *)fp->f_data; if (fp->f_type != DTYPE_VNODE || vp->v_type == VFIFO) { error = ESPIPE; goto out; } offset = SCARG(uap, offset); /* * XXX This works because no file systems actually * XXX take any action on the seek operation. */ if ((error = VOP_SEEK(vp, fp->f_offset, offset, fp->f_cred)) != 0) goto out; /* dofilereadv() will unuse the descriptor for us */ return (dofilereadv(p, fd, fp, SCARG(uap, iovp), SCARG(uap, iovcnt), &offset, 0, retval)); out: FILE_UNUSE(fp, p); return (error); } /* * Positional write system call. */ int sys_pwrite(l, v, retval) struct lwp *l; void *v; register_t *retval; { struct sys_pwrite_args /* { syscallarg(int) fd; syscallarg(const void *) buf; syscallarg(size_t) nbyte; syscallarg(off_t) offset; } */ *uap = v; struct proc *p = l->l_proc; struct filedesc *fdp = p->p_fd; struct file *fp; struct vnode *vp; off_t offset; int error, fd = SCARG(uap, fd); if ((fp = fd_getfile(fdp, fd)) == NULL) return (EBADF); if ((fp->f_flag & FWRITE) == 0) { simple_unlock(&fp->f_slock); return (EBADF); } FILE_USE(fp); vp = (struct vnode *)fp->f_data; if (fp->f_type != DTYPE_VNODE || vp->v_type == VFIFO) { error = ESPIPE; goto out; } offset = SCARG(uap, offset); /* * XXX This works because no file systems actually * XXX take any action on the seek operation. */ if ((error = VOP_SEEK(vp, fp->f_offset, offset, fp->f_cred)) != 0) goto out; /* dofilewrite() will unuse the descriptor for us */ return (dofilewrite(p, fd, fp, SCARG(uap, buf), SCARG(uap, nbyte), &offset, 0, retval)); out: FILE_UNUSE(fp, p); return (error); } /* * Positional gather write system call. */ int sys_pwritev(l, v, retval) struct lwp *l; void *v; register_t *retval; { struct sys_pwritev_args /* { syscallarg(int) fd; syscallarg(const struct iovec *) iovp; syscallarg(int) iovcnt; syscallarg(off_t) offset; } */ *uap = v; struct proc *p = l->l_proc; struct filedesc *fdp = p->p_fd; struct file *fp; struct vnode *vp; off_t offset; int error, fd = SCARG(uap, fd); if ((fp = fd_getfile(fdp, fd)) == NULL) return (EBADF); if ((fp->f_flag & FWRITE) == 0) { simple_unlock(&fp->f_slock); return (EBADF); } FILE_USE(fp); vp = (struct vnode *)fp->f_data; if (fp->f_type != DTYPE_VNODE || vp->v_type == VFIFO) { error = ESPIPE; goto out; } offset = SCARG(uap, offset); /* * XXX This works because no file systems actually * XXX take any action on the seek operation. */ if ((error = VOP_SEEK(vp, fp->f_offset, offset, fp->f_cred)) != 0) goto out; /* dofilewritev() will unuse the descriptor for us */ return (dofilewritev(p, fd, fp, SCARG(uap, iovp), SCARG(uap, iovcnt), &offset, 0, retval)); out: FILE_UNUSE(fp, p); return (error); } /* * Check access permissions. */ int sys_access(l, v, retval) struct lwp *l; void *v; register_t *retval; { struct sys_access_args /* { syscallarg(const char *) path; syscallarg(int) flags; } */ *uap = v; struct proc *p = l->l_proc; struct ucred *cred = crget(); struct vnode *vp; int error, flags; struct nameidata nd; (void)memcpy(cred, p->p_ucred, sizeof(*cred)); cred->cr_ref = 1; cred->cr_uid = p->p_cred->p_ruid; cred->cr_gid = p->p_cred->p_rgid; NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_USERSPACE, SCARG(uap, path), p); /* Override default credentials */ nd.ni_cnd.cn_cred = cred; if ((error = namei(&nd)) != 0) goto out; vp = nd.ni_vp; /* Flags == 0 means only check for existence. */ if (SCARG(uap, flags)) { flags = 0; if (SCARG(uap, flags) & R_OK) flags |= VREAD; if (SCARG(uap, flags) & W_OK) flags |= VWRITE; if (SCARG(uap, flags) & X_OK) flags |= VEXEC; error = VOP_ACCESS(vp, flags, cred, p); if (!error && (flags & VWRITE)) error = vn_writechk(vp); } vput(vp); out: crfree(cred); return (error); } /* * Get file status; this version follows links. */ /* ARGSUSED */ int sys___stat13(l, v, retval) struct lwp *l; void *v; register_t *retval; { struct sys___stat13_args /* { syscallarg(const char *) path; syscallarg(struct stat *) ub; } */ *uap = v; struct proc *p = l->l_proc; struct stat sb; int error; struct nameidata nd; NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_USERSPACE, SCARG(uap, path), p); if ((error = namei(&nd)) != 0) return (error); error = vn_stat(nd.ni_vp, &sb, p); vput(nd.ni_vp); if (error) return (error); error = copyout(&sb, SCARG(uap, ub), sizeof(sb)); return (error); } /* * Get file status; this version does not follow links. */ /* ARGSUSED */ int sys___lstat13(l, v, retval) struct lwp *l; void *v; register_t *retval; { struct sys___lstat13_args /* { syscallarg(const char *) path; syscallarg(struct stat *) ub; } */ *uap = v; struct proc *p = l->l_proc; struct stat sb; int error; struct nameidata nd; NDINIT(&nd, LOOKUP, NOFOLLOW | LOCKLEAF, UIO_USERSPACE, SCARG(uap, path), p); if ((error = namei(&nd)) != 0) return (error); error = vn_stat(nd.ni_vp, &sb, p); vput(nd.ni_vp); if (error) return (error); error = copyout(&sb, SCARG(uap, ub), sizeof(sb)); return (error); } /* * Get configurable pathname variables. */ /* ARGSUSED */ int sys_pathconf(l, v, retval) struct lwp *l; void *v; register_t *retval; { struct sys_pathconf_args /* { syscallarg(const char *) path; syscallarg(int) name; } */ *uap = v; struct proc *p = l->l_proc; int error; struct nameidata nd; NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_USERSPACE, SCARG(uap, path), p); if ((error = namei(&nd)) != 0) return (error); error = VOP_PATHCONF(nd.ni_vp, SCARG(uap, name), retval); vput(nd.ni_vp); return (error); } /* * Return target name of a symbolic link. */ /* ARGSUSED */ int sys_readlink(l, v, retval) struct lwp *l; void *v; register_t *retval; { struct sys_readlink_args /* { syscallarg(const char *) path; syscallarg(char *) buf; syscallarg(size_t) count; } */ *uap = v; struct proc *p = l->l_proc; struct vnode *vp; struct iovec aiov; struct uio auio; int error; struct nameidata nd; NDINIT(&nd, LOOKUP, NOFOLLOW | LOCKLEAF, UIO_USERSPACE, SCARG(uap, path), p); if ((error = namei(&nd)) != 0) return (error); vp = nd.ni_vp; if (vp->v_type != VLNK) error = EINVAL; else if (!(vp->v_mount->mnt_flag & MNT_SYMPERM) || (error = VOP_ACCESS(vp, VREAD, p->p_ucred, p)) == 0) { aiov.iov_base = SCARG(uap, buf); aiov.iov_len = SCARG(uap, count); auio.uio_iov = &aiov; auio.uio_iovcnt = 1; auio.uio_offset = 0; auio.uio_rw = UIO_READ; auio.uio_segflg = UIO_USERSPACE; auio.uio_procp = p; auio.uio_resid = SCARG(uap, count); error = VOP_READLINK(vp, &auio, p->p_ucred); } vput(vp); *retval = SCARG(uap, count) - auio.uio_resid; return (error); } /* * Change flags of a file given a path name. */ /* ARGSUSED */ int sys_chflags(l, v, retval) struct lwp *l; void *v; register_t *retval; { struct sys_chflags_args /* { syscallarg(const char *) path; syscallarg(u_long) flags; } */ *uap = v; struct proc *p = l->l_proc; struct vnode *vp; int error; struct nameidata nd; NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); if ((error = namei(&nd)) != 0) return (error); vp = nd.ni_vp; error = change_flags(vp, SCARG(uap, flags), p); vput(vp); return (error); } /* * Change flags of a file given a file descriptor. */ /* ARGSUSED */ int sys_fchflags(l, v, retval) struct lwp *l; void *v; register_t *retval; { struct sys_fchflags_args /* { syscallarg(int) fd; syscallarg(u_long) flags; } */ *uap = v; struct proc *p = l->l_proc; struct vnode *vp; struct file *fp; int error; /* getvnode() will use the descriptor for us */ if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) return (error); vp = (struct vnode *)fp->f_data; error = change_flags(vp, SCARG(uap, flags), p); VOP_UNLOCK(vp, 0); FILE_UNUSE(fp, p); return (error); } /* * Change flags of a file given a path name; this version does * not follow links. */ int sys_lchflags(l, v, retval) struct lwp *l; void *v; register_t *retval; { struct sys_lchflags_args /* { syscallarg(const char *) path; syscallarg(u_long) flags; } */ *uap = v; struct proc *p = l->l_proc; struct vnode *vp; int error; struct nameidata nd; NDINIT(&nd, LOOKUP, NOFOLLOW, UIO_USERSPACE, SCARG(uap, path), p); if ((error = namei(&nd)) != 0) return (error); vp = nd.ni_vp; error = change_flags(vp, SCARG(uap, flags), p); vput(vp); return (error); } /* * Common routine to change flags of a file. */ int change_flags(vp, flags, p) struct vnode *vp; u_long flags; struct proc *p; { struct mount *mp; struct vattr vattr; int error; if ((error = vn_start_write(vp, &mp, V_WAIT | V_PCATCH)) != 0) return (error); VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); /* * Non-superusers cannot change the flags on devices, even if they * own them. */ if (suser(p->p_ucred, &p->p_acflag) != 0) { if ((error = VOP_GETATTR(vp, &vattr, p->p_ucred, p)) != 0) goto out; if (vattr.va_type == VCHR || vattr.va_type == VBLK) { error = EINVAL; goto out; } } VATTR_NULL(&vattr); vattr.va_flags = flags; error = VOP_SETATTR(vp, &vattr, p->p_ucred, p); out: vn_finished_write(mp, 0); return (error); } /* * Change mode of a file given path name; this version follows links. */ /* ARGSUSED */ int sys_chmod(l, v, retval) struct lwp *l; void *v; register_t *retval; { struct sys_chmod_args /* { syscallarg(const char *) path; syscallarg(int) mode; } */ *uap = v; struct proc *p = l->l_proc; int error; struct nameidata nd; NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); if ((error = namei(&nd)) != 0) return (error); error = change_mode(nd.ni_vp, SCARG(uap, mode), p); vrele(nd.ni_vp); return (error); } /* * Change mode of a file given a file descriptor. */ /* ARGSUSED */ int sys_fchmod(l, v, retval) struct lwp *l; void *v; register_t *retval; { struct sys_fchmod_args /* { syscallarg(int) fd; syscallarg(int) mode; } */ *uap = v; struct proc *p = l->l_proc; struct file *fp; int error; /* getvnode() will use the descriptor for us */ if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) return (error); error = change_mode((struct vnode *)fp->f_data, SCARG(uap, mode), p); FILE_UNUSE(fp, p); return (error); } /* * Change mode of a file given path name; this version does not follow links. */ /* ARGSUSED */ int sys_lchmod(l, v, retval) struct lwp *l; void *v; register_t *retval; { struct sys_lchmod_args /* { syscallarg(const char *) path; syscallarg(int) mode; } */ *uap = v; struct proc *p = l->l_proc; int error; struct nameidata nd; NDINIT(&nd, LOOKUP, NOFOLLOW, UIO_USERSPACE, SCARG(uap, path), p); if ((error = namei(&nd)) != 0) return (error); error = change_mode(nd.ni_vp, SCARG(uap, mode), p); vrele(nd.ni_vp); return (error); } /* * Common routine to set mode given a vnode. */ static int change_mode(vp, mode, p) struct vnode *vp; int mode; struct proc *p; { struct mount *mp; struct vattr vattr; int error; if ((error = vn_start_write(vp, &mp, V_WAIT | V_PCATCH)) != 0) return (error); VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); VATTR_NULL(&vattr); vattr.va_mode = mode & ALLPERMS; error = VOP_SETATTR(vp, &vattr, p->p_ucred, p); VOP_UNLOCK(vp, 0); vn_finished_write(mp, 0); return (error); } /* * Set ownership given a path name; this version follows links. */ /* ARGSUSED */ int sys_chown(l, v, retval) struct lwp *l; void *v; register_t *retval; { struct sys_chown_args /* { syscallarg(const char *) path; syscallarg(uid_t) uid; syscallarg(gid_t) gid; } */ *uap = v; struct proc *p = l->l_proc; int error; struct nameidata nd; NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); if ((error = namei(&nd)) != 0) return (error); error = change_owner(nd.ni_vp, SCARG(uap, uid), SCARG(uap, gid), p, 0); vrele(nd.ni_vp); return (error); } /* * Set ownership given a path name; this version follows links. * Provides POSIX semantics. */ /* ARGSUSED */ int sys___posix_chown(l, v, retval) struct lwp *l; void *v; register_t *retval; { struct sys_chown_args /* { syscallarg(const char *) path; syscallarg(uid_t) uid; syscallarg(gid_t) gid; } */ *uap = v; struct proc *p = l->l_proc; int error; struct nameidata nd; NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); if ((error = namei(&nd)) != 0) return (error); error = change_owner(nd.ni_vp, SCARG(uap, uid), SCARG(uap, gid), p, 1); vrele(nd.ni_vp); return (error); } /* * Set ownership given a file descriptor. */ /* ARGSUSED */ int sys_fchown(l, v, retval) struct lwp *l; void *v; register_t *retval; { struct sys_fchown_args /* { syscallarg(int) fd; syscallarg(uid_t) uid; syscallarg(gid_t) gid; } */ *uap = v; struct proc *p = l->l_proc; int error; struct file *fp; /* getvnode() will use the descriptor for us */ if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) return (error); error = change_owner((struct vnode *)fp->f_data, SCARG(uap, uid), SCARG(uap, gid), p, 0); FILE_UNUSE(fp, p); return (error); } /* * Set ownership given a file descriptor, providing POSIX/XPG semantics. */ /* ARGSUSED */ int sys___posix_fchown(l, v, retval) struct lwp *l; void *v; register_t *retval; { struct sys_fchown_args /* { syscallarg(int) fd; syscallarg(uid_t) uid; syscallarg(gid_t) gid; } */ *uap = v; struct proc *p = l->l_proc; int error; struct file *fp; /* getvnode() will use the descriptor for us */ if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) return (error); error = change_owner((struct vnode *)fp->f_data, SCARG(uap, uid), SCARG(uap, gid), p, 1); FILE_UNUSE(fp, p); return (error); } /* * Set ownership given a path name; this version does not follow links. */ /* ARGSUSED */ int sys_lchown(l, v, retval) struct lwp *l; void *v; register_t *retval; { struct sys_lchown_args /* { syscallarg(const char *) path; syscallarg(uid_t) uid; syscallarg(gid_t) gid; } */ *uap = v; struct proc *p = l->l_proc; int error; struct nameidata nd; NDINIT(&nd, LOOKUP, NOFOLLOW, UIO_USERSPACE, SCARG(uap, path), p); if ((error = namei(&nd)) != 0) return (error); error = change_owner(nd.ni_vp, SCARG(uap, uid), SCARG(uap, gid), p, 0); vrele(nd.ni_vp); return (error); } /* * Set ownership given a path name; this version does not follow links. * Provides POSIX/XPG semantics. */ /* ARGSUSED */ int sys___posix_lchown(l, v, retval) struct lwp *l; void *v; register_t *retval; { struct sys_lchown_args /* { syscallarg(const char *) path; syscallarg(uid_t) uid; syscallarg(gid_t) gid; } */ *uap = v; struct proc *p = l->l_proc; int error; struct nameidata nd; NDINIT(&nd, LOOKUP, NOFOLLOW, UIO_USERSPACE, SCARG(uap, path), p); if ((error = namei(&nd)) != 0) return (error); error = change_owner(nd.ni_vp, SCARG(uap, uid), SCARG(uap, gid), p, 1); vrele(nd.ni_vp); return (error); } /* * Common routine to set ownership given a vnode. */ static int change_owner(vp, uid, gid, p, posix_semantics) struct vnode *vp; uid_t uid; gid_t gid; struct proc *p; int posix_semantics; { struct mount *mp; struct vattr vattr; mode_t newmode; int error; if ((error = vn_start_write(vp, &mp, V_WAIT | V_PCATCH)) != 0) return (error); VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); if ((error = VOP_GETATTR(vp, &vattr, p->p_ucred, p)) != 0) goto out; #define CHANGED(x) ((int)(x) != -1) newmode = vattr.va_mode; if (posix_semantics) { /* * POSIX/XPG semantics: if the caller is not the super-user, * clear set-user-id and set-group-id bits. Both POSIX and * the XPG consider the behaviour for calls by the super-user * implementation-defined; we leave the set-user-id and set- * group-id settings intact in that case. */ if (suser(p->p_ucred, NULL) != 0) newmode &= ~(S_ISUID | S_ISGID); } else { /* * NetBSD semantics: when changing owner and/or group, * clear the respective bit(s). */ if (CHANGED(uid)) newmode &= ~S_ISUID; if (CHANGED(gid)) newmode &= ~S_ISGID; } /* Update va_mode iff altered. */ if (vattr.va_mode == newmode) newmode = VNOVAL; VATTR_NULL(&vattr); vattr.va_uid = CHANGED(uid) ? uid : (uid_t)VNOVAL; vattr.va_gid = CHANGED(gid) ? gid : (gid_t)VNOVAL; vattr.va_mode = newmode; error = VOP_SETATTR(vp, &vattr, p->p_ucred, p); #undef CHANGED out: VOP_UNLOCK(vp, 0); vn_finished_write(mp, 0); return (error); } /* * Set the access and modification times given a path name; this * version follows links. */ /* ARGSUSED */ int sys_utimes(l, v, retval) struct lwp *l; void *v; register_t *retval; { struct sys_utimes_args /* { syscallarg(const char *) path; syscallarg(const struct timeval *) tptr; } */ *uap = v; struct proc *p = l->l_proc; int error; struct nameidata nd; NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); if ((error = namei(&nd)) != 0) return (error); error = change_utimes(nd.ni_vp, SCARG(uap, tptr), p); vrele(nd.ni_vp); return (error); } /* * Set the access and modification times given a file descriptor. */ /* ARGSUSED */ int sys_futimes(l, v, retval) struct lwp *l; void *v; register_t *retval; { struct sys_futimes_args /* { syscallarg(int) fd; syscallarg(const struct timeval *) tptr; } */ *uap = v; struct proc *p = l->l_proc; int error; struct file *fp; /* getvnode() will use the descriptor for us */ if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) return (error); error = change_utimes((struct vnode *)fp->f_data, SCARG(uap, tptr), p); FILE_UNUSE(fp, p); return (error); } /* * Set the access and modification times given a path name; this * version does not follow links. */ /* ARGSUSED */ int sys_lutimes(l, v, retval) struct lwp *l; void *v; register_t *retval; { struct sys_lutimes_args /* { syscallarg(const char *) path; syscallarg(const struct timeval *) tptr; } */ *uap = v; struct proc *p = l->l_proc; int error; struct nameidata nd; NDINIT(&nd, LOOKUP, NOFOLLOW, UIO_USERSPACE, SCARG(uap, path), p); if ((error = namei(&nd)) != 0) return (error); error = change_utimes(nd.ni_vp, SCARG(uap, tptr), p); vrele(nd.ni_vp); return (error); } /* * Common routine to set access and modification times given a vnode. */ static int change_utimes(vp, tptr, p) struct vnode *vp; const struct timeval *tptr; struct proc *p; { struct timeval tv[2]; struct mount *mp; struct vattr vattr; int error; if ((error = vn_start_write(vp, &mp, V_WAIT | V_PCATCH)) != 0) return (error); VATTR_NULL(&vattr); if (tptr == NULL) { microtime(&tv[0]); tv[1] = tv[0]; vattr.va_vaflags |= VA_UTIMES_NULL; } else { error = copyin(tptr, tv, sizeof(tv)); if (error) goto out; } VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); vattr.va_atime.tv_sec = tv[0].tv_sec; vattr.va_atime.tv_nsec = tv[0].tv_usec * 1000; vattr.va_mtime.tv_sec = tv[1].tv_sec; vattr.va_mtime.tv_nsec = tv[1].tv_usec * 1000; error = VOP_SETATTR(vp, &vattr, p->p_ucred, p); VOP_UNLOCK(vp, 0); out: vn_finished_write(mp, 0); return (error); } /* * Truncate a file given its path name. */ /* ARGSUSED */ int sys_truncate(l, v, retval) struct lwp *l; void *v; register_t *retval; { struct sys_truncate_args /* { syscallarg(const char *) path; syscallarg(int) pad; syscallarg(off_t) length; } */ *uap = v; struct proc *p = l->l_proc; struct vnode *vp; struct mount *mp; struct vattr vattr; int error; struct nameidata nd; NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); if ((error = namei(&nd)) != 0) return (error); vp = nd.ni_vp; if ((error = vn_start_write(vp, &mp, V_WAIT | V_PCATCH)) != 0) { vrele(vp); return (error); } VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); if (vp->v_type == VDIR) error = EISDIR; else if ((error = vn_writechk(vp)) == 0 && (error = VOP_ACCESS(vp, VWRITE, p->p_ucred, p)) == 0) { VATTR_NULL(&vattr); vattr.va_size = SCARG(uap, length); error = VOP_SETATTR(vp, &vattr, p->p_ucred, p); } vput(vp); vn_finished_write(mp, 0); return (error); } /* * Truncate a file given a file descriptor. */ /* ARGSUSED */ int sys_ftruncate(l, v, retval) struct lwp *l; void *v; register_t *retval; { struct sys_ftruncate_args /* { syscallarg(int) fd; syscallarg(int) pad; syscallarg(off_t) length; } */ *uap = v; struct proc *p = l->l_proc; struct mount *mp; struct vattr vattr; struct vnode *vp; struct file *fp; int error; /* getvnode() will use the descriptor for us */ if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) return (error); if ((fp->f_flag & FWRITE) == 0) { error = EINVAL; goto out; } vp = (struct vnode *)fp->f_data; if ((error = vn_start_write(vp, &mp, V_WAIT | V_PCATCH)) != 0) { FILE_UNUSE(fp, p); return (error); } VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); if (vp->v_type == VDIR) error = EISDIR; else if ((error = vn_writechk(vp)) == 0) { VATTR_NULL(&vattr); vattr.va_size = SCARG(uap, length); error = VOP_SETATTR(vp, &vattr, fp->f_cred, p); } VOP_UNLOCK(vp, 0); vn_finished_write(mp, 0); out: FILE_UNUSE(fp, p); return (error); } /* * Sync an open file. */ /* ARGSUSED */ int sys_fsync(l, v, retval) struct lwp *l; void *v; register_t *retval; { struct sys_fsync_args /* { syscallarg(int) fd; } */ *uap = v; struct proc *p = l->l_proc; struct vnode *vp; struct mount *mp; struct file *fp; int error; /* getvnode() will use the descriptor for us */ if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) return (error); vp = (struct vnode *)fp->f_data; if ((error = vn_start_write(vp, &mp, V_WAIT | V_PCATCH)) != 0) { FILE_UNUSE(fp, p); return (error); } vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); error = VOP_FSYNC(vp, fp->f_cred, FSYNC_WAIT, 0, 0, p); if (error == 0 && bioops.io_fsync != NULL && vp->v_mount && (vp->v_mount->mnt_flag & MNT_SOFTDEP)) (*bioops.io_fsync)(vp); VOP_UNLOCK(vp, 0); vn_finished_write(mp, 0); FILE_UNUSE(fp, p); return (error); } /* * Sync the data of an open file. */ /* ARGSUSED */ int sys_fdatasync(l, v, retval) struct lwp *l; void *v; register_t *retval; { struct sys_fdatasync_args /* { syscallarg(int) fd; } */ *uap = v; struct proc *p = l->l_proc; struct vnode *vp; struct file *fp; int error; /* getvnode() will use the descriptor for us */ if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) return (error); if ((fp->f_flag & FWRITE) == 0) { FILE_UNUSE(fp, p); return (EBADF); } vp = (struct vnode *)fp->f_data; vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); error = VOP_FSYNC(vp, fp->f_cred, FSYNC_WAIT|FSYNC_DATAONLY, 0, 0, p); VOP_UNLOCK(vp, 0); FILE_UNUSE(fp, p); return (error); } /* * Rename files, (standard) BSD semantics frontend. */ /* ARGSUSED */ int sys_rename(l, v, retval) struct lwp *l; void *v; register_t *retval; { struct sys_rename_args /* { syscallarg(const char *) from; syscallarg(const char *) to; } */ *uap = v; struct proc *p = l->l_proc; return (rename_files(SCARG(uap, from), SCARG(uap, to), p, 0)); } /* * Rename files, POSIX semantics frontend. */ /* ARGSUSED */ int sys___posix_rename(l, v, retval) struct lwp *l; void *v; register_t *retval; { struct sys___posix_rename_args /* { syscallarg(const char *) from; syscallarg(const char *) to; } */ *uap = v; struct proc *p = l->l_proc; return (rename_files(SCARG(uap, from), SCARG(uap, to), p, 1)); } /* * Rename files. Source and destination must either both be directories, * or both not be directories. If target is a directory, it must be empty. * If `from' and `to' refer to the same object, the value of the `retain' * argument is used to determine whether `from' will be * * (retain == 0) deleted unless `from' and `to' refer to the same * object in the file system's name space (BSD). * (retain == 1) always retained (POSIX). */ static int rename_files(from, to, p, retain) const char *from, *to; struct proc *p; int retain; { struct mount *mp = NULL; struct vnode *tvp, *fvp, *tdvp; struct nameidata fromnd, tond; int error; NDINIT(&fromnd, DELETE, WANTPARENT | SAVESTART, UIO_USERSPACE, from, p); if ((error = namei(&fromnd)) != 0) return (error); fvp = fromnd.ni_vp; error = vn_start_write(fvp, &mp, V_WAIT | V_PCATCH); if (error != 0) { VOP_ABORTOP(fromnd.ni_dvp, &fromnd.ni_cnd); vrele(fromnd.ni_dvp); vrele(fvp); if (fromnd.ni_startdir) vrele(fromnd.ni_startdir); PNBUF_PUT(fromnd.ni_cnd.cn_pnbuf); return (error); } NDINIT(&tond, RENAME, LOCKPARENT | LOCKLEAF | NOCACHE | SAVESTART | (fvp->v_type == VDIR ? CREATEDIR : 0), UIO_USERSPACE, to, p); if ((error = namei(&tond)) != 0) { VOP_ABORTOP(fromnd.ni_dvp, &fromnd.ni_cnd); vrele(fromnd.ni_dvp); vrele(fvp); goto out1; } tdvp = tond.ni_dvp; tvp = tond.ni_vp; if (tvp != NULL) { if (fvp->v_type == VDIR && tvp->v_type != VDIR) { error = ENOTDIR; goto out; } else if (fvp->v_type != VDIR && tvp->v_type == VDIR) { error = EISDIR; goto out; } } if (fvp == tdvp) error = EINVAL; /* * Source and destination refer to the same object. */ if (fvp == tvp) { if (retain) error = -1; else if (fromnd.ni_dvp == tdvp && fromnd.ni_cnd.cn_namelen == tond.ni_cnd.cn_namelen && !memcmp(fromnd.ni_cnd.cn_nameptr, tond.ni_cnd.cn_nameptr, fromnd.ni_cnd.cn_namelen)) error = -1; } out: if (!error) { VOP_LEASE(tdvp, p, p->p_ucred, LEASE_WRITE); if (fromnd.ni_dvp != tdvp) VOP_LEASE(fromnd.ni_dvp, p, p->p_ucred, LEASE_WRITE); if (tvp) { VOP_LEASE(tvp, p, p->p_ucred, LEASE_WRITE); } error = VOP_RENAME(fromnd.ni_dvp, fromnd.ni_vp, &fromnd.ni_cnd, tond.ni_dvp, tond.ni_vp, &tond.ni_cnd); } else { VOP_ABORTOP(tond.ni_dvp, &tond.ni_cnd); if (tdvp == tvp) vrele(tdvp); else vput(tdvp); if (tvp) vput(tvp); VOP_ABORTOP(fromnd.ni_dvp, &fromnd.ni_cnd); vrele(fromnd.ni_dvp); vrele(fvp); } vrele(tond.ni_startdir); PNBUF_PUT(tond.ni_cnd.cn_pnbuf); out1: vn_finished_write(mp, 0); if (fromnd.ni_startdir) vrele(fromnd.ni_startdir); PNBUF_PUT(fromnd.ni_cnd.cn_pnbuf); return (error == -1 ? 0 : error); } /* * Make a directory file. */ /* ARGSUSED */ int sys_mkdir(l, v, retval) struct lwp *l; void *v; register_t *retval; { struct sys_mkdir_args /* { syscallarg(const char *) path; syscallarg(int) mode; } */ *uap = v; struct proc *p = l->l_proc; struct mount *mp; struct vnode *vp; struct vattr vattr; int error; struct nameidata nd; restart: NDINIT(&nd, CREATE, LOCKPARENT | CREATEDIR, UIO_USERSPACE, SCARG(uap, path), p); if ((error = namei(&nd)) != 0) return (error); vp = nd.ni_vp; if (vp != NULL) { VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); if (nd.ni_dvp == vp) vrele(nd.ni_dvp); else vput(nd.ni_dvp); vrele(vp); return (EEXIST); } if (vn_start_write(nd.ni_dvp, &mp, V_NOWAIT) != 0) { VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); if (nd.ni_dvp == vp) vrele(nd.ni_dvp); else vput(nd.ni_dvp); if ((error = vn_start_write(NULL, &mp, V_WAIT | V_SLEEPONLY | V_PCATCH)) != 0) return (error); goto restart; } VATTR_NULL(&vattr); vattr.va_type = VDIR; vattr.va_mode = (SCARG(uap, mode) & ACCESSPERMS) &~ p->p_cwdi->cwdi_cmask; VOP_LEASE(nd.ni_dvp, p, p->p_ucred, LEASE_WRITE); error = VOP_MKDIR(nd.ni_dvp, &nd.ni_vp, &nd.ni_cnd, &vattr); if (!error) vput(nd.ni_vp); vn_finished_write(mp, 0); return (error); } /* * Remove a directory file. */ /* ARGSUSED */ int sys_rmdir(l, v, retval) struct lwp *l; void *v; register_t *retval; { struct sys_rmdir_args /* { syscallarg(const char *) path; } */ *uap = v; struct proc *p = l->l_proc; struct mount *mp; struct vnode *vp; int error; struct nameidata nd; restart: NDINIT(&nd, DELETE, LOCKPARENT | LOCKLEAF, UIO_USERSPACE, SCARG(uap, path), p); if ((error = namei(&nd)) != 0) return (error); vp = nd.ni_vp; if (vp->v_type != VDIR) { error = ENOTDIR; goto out; } /* * No rmdir "." please. */ if (nd.ni_dvp == vp) { error = EINVAL; goto out; } /* * The root of a mounted filesystem cannot be deleted. */ if (vp->v_flag & VROOT) { error = EBUSY; goto out; } if (vn_start_write(nd.ni_dvp, &mp, V_NOWAIT) != 0) { VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); if (nd.ni_dvp == vp) vrele(nd.ni_dvp); else vput(nd.ni_dvp); vput(vp); if ((error = vn_start_write(NULL, &mp, V_WAIT | V_SLEEPONLY | V_PCATCH)) != 0) return (error); goto restart; } VOP_LEASE(nd.ni_dvp, p, p->p_ucred, LEASE_WRITE); VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); error = VOP_RMDIR(nd.ni_dvp, nd.ni_vp, &nd.ni_cnd); vn_finished_write(mp, 0); return (error); out: VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd); if (nd.ni_dvp == vp) vrele(nd.ni_dvp); else vput(nd.ni_dvp); vput(vp); return (error); } /* * Read a block of directory entries in a file system independent format. */ int sys_getdents(l, v, retval) struct lwp *l; void *v; register_t *retval; { struct sys_getdents_args /* { syscallarg(int) fd; syscallarg(char *) buf; syscallarg(size_t) count; } */ *uap = v; struct proc *p = l->l_proc; struct file *fp; int error, done; /* getvnode() will use the descriptor for us */ if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0) return (error); if ((fp->f_flag & FREAD) == 0) { error = EBADF; goto out; } error = vn_readdir(fp, SCARG(uap, buf), UIO_USERSPACE, SCARG(uap, count), &done, p, 0, 0); #ifdef KTRACE if (!error && KTRPOINT(p, KTR_GENIO)) { struct iovec iov; iov.iov_base = SCARG(uap, buf); iov.iov_len = done; ktrgenio(p, SCARG(uap, fd), UIO_READ, &iov, done, 0); } #endif *retval = done; out: FILE_UNUSE(fp, p); return (error); } /* * Set the mode mask for creation of filesystem nodes. */ int sys_umask(l, v, retval) struct lwp *l; void *v; register_t *retval; { struct sys_umask_args /* { syscallarg(mode_t) newmask; } */ *uap = v; struct proc *p = l->l_proc; struct cwdinfo *cwdi; cwdi = p->p_cwdi; *retval = cwdi->cwdi_cmask; cwdi->cwdi_cmask = SCARG(uap, newmask) & ALLPERMS; return (0); } /* * Void all references to file by ripping underlying filesystem * away from vnode. */ /* ARGSUSED */ int sys_revoke(l, v, retval) struct lwp *l; void *v; register_t *retval; { struct sys_revoke_args /* { syscallarg(const char *) path; } */ *uap = v; struct proc *p = l->l_proc; struct mount *mp; struct vnode *vp; struct vattr vattr; int error; struct nameidata nd; NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p); if ((error = namei(&nd)) != 0) return (error); vp = nd.ni_vp; if ((error = VOP_GETATTR(vp, &vattr, p->p_ucred, p)) != 0) goto out; if (p->p_ucred->cr_uid != vattr.va_uid && (error = suser(p->p_ucred, &p->p_acflag)) != 0) goto out; if ((error = vn_start_write(vp, &mp, V_WAIT | V_PCATCH)) != 0) goto out; if (vp->v_usecount > 1 || (vp->v_flag & (VALIASED | VLAYER))) VOP_REVOKE(vp, REVOKEALL); vn_finished_write(mp, 0); out: vrele(vp); return (error); } /* * Convert a user file descriptor to a kernel file entry. */ int getvnode(fdp, fd, fpp) struct filedesc *fdp; int fd; struct file **fpp; { struct vnode *vp; struct file *fp; if ((fp = fd_getfile(fdp, fd)) == NULL) return (EBADF); FILE_USE(fp); if (fp->f_type != DTYPE_VNODE) { FILE_UNUSE(fp, NULL); return (EINVAL); } vp = (struct vnode *)fp->f_data; if (vp->v_type == VBAD) { FILE_UNUSE(fp, NULL); return (EBADF); } *fpp = fp; return (0); }