2 * Copyright (c) 1993 Jan-Simon Pendry
4 * The Regents of the University of California. All rights reserved.
6 * This code is derived from software contributed to Berkeley by
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19 * This product includes software developed by the University of
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37 * @(#)procfs_vfsops.c 8.7 (Berkeley) 5/10/95
39 * $FreeBSD: src/sys/miscfs/procfs/procfs_vfsops.c,v 1.32.2.1 2001/10/15 20:42:01 des Exp $
40 * $DragonFly: src/sys/vfs/procfs/procfs_vfsops.c,v 1.9 2004/09/30 19:00:19 dillon Exp $
44 * procfs VFS interface
47 #include <sys/param.h>
48 #include <sys/systm.h>
49 #include <sys/kernel.h>
51 #include <sys/mount.h>
52 #include <sys/vnode.h>
53 #include <vfs/procfs/procfs.h>
55 extern struct vnodeopv_entry_desc procfs_vnodeop_entries[];
57 static int procfs_mount (struct mount *mp, char *path, caddr_t data,
59 static int procfs_statfs (struct mount *mp, struct statfs *sbp,
61 static int procfs_unmount (struct mount *mp, int mntflags,
71 procfs_mount(struct mount *mp, char *path, caddr_t data, struct thread *td)
76 if (mp->mnt_flag & MNT_UPDATE)
79 if (mp->mnt_vfc->vfc_refcount == 1 && (error = at_exit(procfs_exit))) {
80 printf("procfs: cannot register procfs_exit with at_exit\n");
84 mp->mnt_flag |= MNT_LOCAL;
88 (void) copyinstr(path, (caddr_t)mp->mnt_stat.f_mntonname, MNAMELEN, &size);
89 bzero(mp->mnt_stat.f_mntonname + size, MNAMELEN - size);
91 size = sizeof("procfs") - 1;
92 bcopy("procfs", mp->mnt_stat.f_mntfromname, size);
93 bzero(mp->mnt_stat.f_mntfromname + size, MNAMELEN - size);
94 procfs_statfs(mp, &mp->mnt_stat, td);
95 vfs_add_vnodeops(&mp->mnt_vn_ops, procfs_vnodeop_entries);
101 * unmount system call
104 procfs_unmount(struct mount *mp, int mntflags, struct thread *td)
109 if (mntflags & MNT_FORCE)
112 error = vflush(mp, 0, flags);
116 if (mp->mnt_vfc->vfc_refcount == 1)
117 rm_at_exit(procfs_exit);
123 * Sets *vpp to the root procfs vnode, referenced and exclusively locked.
126 procfs_root(struct mount *mp, struct vnode **vpp)
128 return (procfs_allocvp(mp, vpp, 0, Proot));
132 * Get file system statistics.
135 procfs_statfs(struct mount *mp, struct statfs *sbp, struct thread *td)
137 sbp->f_bsize = PAGE_SIZE;
138 sbp->f_iosize = PAGE_SIZE;
139 sbp->f_blocks = 1; /* avoid divide by zero in some df's */
142 sbp->f_files = maxproc; /* approx */
143 sbp->f_ffree = maxproc - nprocs; /* approx */
145 if (sbp != &mp->mnt_stat) {
146 sbp->f_type = mp->mnt_vfc->vfc_typenum;
147 bcopy(&mp->mnt_stat.f_fsid, &sbp->f_fsid, sizeof(sbp->f_fsid));
148 bcopy(mp->mnt_stat.f_mntonname, sbp->f_mntonname, MNAMELEN);
149 bcopy(mp->mnt_stat.f_mntfromname, sbp->f_mntfromname, MNAMELEN);
155 static struct vfsops procfs_vfsops = {
172 VFS_SET(procfs_vfsops, procfs, VFCF_SYNTHETIC);
173 MODULE_VERSION(procfs, 1);