/* $OpenBSD: procfs_vfsops.c,v 1.29 2013/04/15 15:32:19 jsing Exp $ */ /* $NetBSD: procfs_vfsops.c,v 1.25 1996/02/09 22:40:53 christos Exp $ */ /* * Copyright (c) 1993 Jan-Simon Pendry * Copyright (c) 1993 * The Regents of the University of California. All rights reserved. * * This code is derived from software contributed to Berkeley by * Jan-Simon Pendry. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * 3. Neither the name of the University nor the names of its contributors * may be used to endorse or promote products derived from this software * without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. * * @(#)procfs_vfsops.c 8.5 (Berkeley) 6/15/94 */ /* * procfs VFS interface */ #include #include #include #include #include #include #include #include #include #include #include #include #include int procfs_mount(struct mount *, const char *, void *, struct nameidata *, struct proc *); int procfs_start(struct mount *, int, struct proc *); int procfs_unmount(struct mount *, int, struct proc *); int procfs_statfs(struct mount *, struct statfs *, struct proc *); /* * VFS Operations. * * mount system call */ /* ARGSUSED */ int procfs_mount(struct mount *mp, const char *path, void *data, struct nameidata *ndp, struct proc *p) { struct procfsmount *pmnt; struct procfs_args args; int error; if (UIO_MX & (UIO_MX-1)) { log(LOG_ERR, "procfs: invalid directory entry size"); return (EINVAL); } if (mp->mnt_flag & MNT_UPDATE) return (EOPNOTSUPP); if (data != NULL) { error = copyin(data, &args, sizeof(args)); if (error != 0) return (error); if (args.version != PROCFS_ARGSVERSION) return (EINVAL); } else args.flags = 0; mp->mnt_flag |= MNT_LOCAL; pmnt = (struct procfsmount *) malloc(sizeof(struct procfsmount), M_MISCFSMNT, M_WAITOK); mp->mnt_data = pmnt; vfs_getnewfsid(mp); bzero(mp->mnt_stat.f_mntonname, MNAMELEN); strlcpy(mp->mnt_stat.f_mntonname, path, MNAMELEN); bzero(mp->mnt_stat.f_mntfromname, MNAMELEN); bcopy("procfs", mp->mnt_stat.f_mntfromname, sizeof("procfs")); bzero(mp->mnt_stat.f_mntfromspec, MNAMELEN); bcopy("procfs", mp->mnt_stat.f_mntfromspec, sizeof("procfs")); bcopy(&args, &mp->mnt_stat.mount_info.procfs_args, sizeof(args)); #ifdef notyet pmnt->pmnt_exechook = exechook_establish(procfs_revoke_vnodes, mp); #endif pmnt->pmnt_flags = args.flags; return (0); } /* * unmount system call */ int procfs_unmount(struct mount *mp, int mntflags, struct proc *p) { int error; extern int doforce; int flags = 0; if (mntflags & MNT_FORCE) { /* procfs can never be rootfs so don't check for it */ if (!doforce) return (EINVAL); flags |= FORCECLOSE; } if ((error = vflush(mp, 0, flags)) != 0) return (error); free(VFSTOPROC(mp), M_MISCFSMNT); mp->mnt_data = 0; return (0); } int procfs_root(struct mount *mp, struct vnode **vpp) { int error; error = procfs_allocvp(mp, vpp, 0, Proot); if (error) return (error); vn_lock(*vpp, LK_EXCLUSIVE | LK_RETRY, curproc); return (0); } /* ARGSUSED */ int procfs_start(struct mount *mp, int flags, struct proc *p) { return (0); } /* * Get file system statistics. */ int procfs_statfs(struct mount *mp, struct statfs *sbp, struct proc *p) { struct vmtotal vmtotals; uvm_total(&vmtotals); sbp->f_bsize = PAGE_SIZE; sbp->f_iosize = PAGE_SIZE; sbp->f_blocks = vmtotals.t_vm; sbp->f_bfree = vmtotals.t_vm - vmtotals.t_avm; sbp->f_bavail = 0; sbp->f_files = maxprocess; /* approx */ sbp->f_ffree = maxprocess - nprocesses; /* approx */ if (sbp != &mp->mnt_stat) { bcopy(&mp->mnt_stat.f_fsid, &sbp->f_fsid, sizeof(sbp->f_fsid)); bcopy(mp->mnt_stat.f_mntonname, sbp->f_mntonname, MNAMELEN); bcopy(mp->mnt_stat.f_mntfromname, sbp->f_mntfromname, MNAMELEN); bcopy(mp->mnt_stat.f_mntfromspec, sbp->f_mntfromspec, MNAMELEN); bcopy(&mp->mnt_stat.mount_info.procfs_args, &sbp->mount_info.procfs_args, sizeof(struct procfs_args)); } strncpy(sbp->f_fstypename, mp->mnt_vfc->vfc_name, MFSNAMELEN); return (0); } #define procfs_sync ((int (*)(struct mount *, int, struct ucred *, \ struct proc *))nullop) #define procfs_fhtovp ((int (*)(struct mount *, struct fid *, \ struct vnode **))eopnotsupp) #define procfs_quotactl ((int (*)(struct mount *, int, uid_t, caddr_t, \ struct proc *))eopnotsupp) #define procfs_sysctl ((int (*)(int *, u_int, void *, size_t *, void *, \ size_t, struct proc *))eopnotsupp) #define procfs_vget ((int (*)(struct mount *, ino_t, struct vnode **)) \ eopnotsupp) #define procfs_vptofh ((int (*)(struct vnode *, struct fid *))eopnotsupp) #define procfs_checkexp ((int (*)(struct mount *, struct mbuf *, \ int *, struct ucred **))eopnotsupp) const struct vfsops procfs_vfsops = { procfs_mount, procfs_start, procfs_unmount, procfs_root, procfs_quotactl, procfs_statfs, procfs_sync, procfs_vget, procfs_fhtovp, procfs_vptofh, procfs_init, procfs_sysctl, procfs_checkexp };