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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10 * modification, are permitted provided that the following conditions
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19 * without specific prior written permission.
21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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33 * @(#)procfs_vfsops.c 8.7 (Berkeley) 5/10/95
35 * $FreeBSD: src/sys/miscfs/procfs/procfs_vfsops.c,v 1.32.2.1 2001/10/15 20:42:01 des Exp $
39 * procfs VFS interface
42 #include <sys/param.h>
43 #include <sys/systm.h>
44 #include <sys/kernel.h>
46 #include <sys/mount.h>
47 #include <sys/vnode.h>
48 #include <vfs/procfs/procfs.h>
50 extern struct vop_ops procfs_vnode_vops;
52 static int procfs_mount (struct mount *mp, char *path, caddr_t data,
54 static int procfs_statfs (struct mount *mp, struct statfs *sbp,
56 static int procfs_unmount (struct mount *mp, int mntflags);
65 procfs_mount(struct mount *mp, char *path, caddr_t data, struct ucred *cred)
70 if (mp->mnt_flag & MNT_UPDATE)
73 if (mp->mnt_vfc->vfc_refcount == 1 && (error = at_exit(procfs_exit))) {
74 kprintf("procfs: cannot register procfs_exit with at_exit\n");
78 mp->mnt_flag |= MNT_LOCAL;
79 mp->mnt_kern_flag |= MNTK_NOSTKMNT;
83 size = sizeof("procfs") - 1;
84 bcopy("procfs", mp->mnt_stat.f_mntfromname, size);
85 bzero(mp->mnt_stat.f_mntfromname + size, MNAMELEN - size);
86 procfs_statfs(mp, &mp->mnt_stat, cred);
87 vfs_add_vnodeops(mp, &procfs_vnode_vops, &mp->mnt_vn_norm_ops);
96 procfs_unmount(struct mount *mp, int mntflags)
101 if (mntflags & MNT_FORCE)
104 error = vflush(mp, 0, flags);
108 if (mp->mnt_vfc->vfc_refcount == 1)
109 rm_at_exit(procfs_exit);
115 * Sets *vpp to the root procfs vnode, referenced and exclusively locked.
118 procfs_root(struct mount *mp, struct vnode **vpp)
120 return (procfs_allocvp(mp, vpp, 0, Proot));
124 * Get file system statistics.
127 procfs_statfs(struct mount *mp, struct statfs *sbp, struct ucred *cred)
129 sbp->f_bsize = PAGE_SIZE;
130 sbp->f_iosize = PAGE_SIZE;
131 sbp->f_blocks = 1; /* avoid divide by zero in some df's */
134 sbp->f_files = maxproc; /* approx */
135 sbp->f_ffree = maxproc - nprocs; /* approx */
137 if (sbp != &mp->mnt_stat) {
138 sbp->f_type = mp->mnt_vfc->vfc_typenum;
139 bcopy(&mp->mnt_stat.f_fsid, &sbp->f_fsid, sizeof(sbp->f_fsid));
140 bcopy(mp->mnt_stat.f_mntfromname, sbp->f_mntfromname, MNAMELEN);
146 static struct vfsops procfs_vfsops = {
147 .vfs_mount = procfs_mount,
148 .vfs_unmount = procfs_unmount,
149 .vfs_root = procfs_root,
150 .vfs_statfs = procfs_statfs,
151 .vfs_sync = vfs_stdsync
154 VFS_SET(procfs_vfsops, procfs, VFCF_SYNTHETIC);
155 MODULE_VERSION(procfs, 1);