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32 * @(#)fdesc_vfsops.c 8.4 (Berkeley) 1/21/94
34 * $FreeBSD: src/sys/miscfs/fdesc/fdesc_vfsops.c,v 1.22.2.3 2002/08/23 17:42:39 njl Exp $
41 #include <sys/param.h>
42 #include <sys/systm.h>
43 #include <sys/filedesc.h>
44 #include <sys/kernel.h>
46 #include <sys/malloc.h>
47 #include <sys/mount.h>
49 #include <sys/resourcevar.h>
50 #include <sys/socket.h>
51 #include <sys/vnode.h>
55 extern struct vop_ops fdesc_vnode_vops;
57 static MALLOC_DEFINE(M_FDESCMNT, "FDESC mount", "FDESC mount structure");
59 static int fdesc_mount (struct mount *mp, char *path, caddr_t data,
61 static int fdesc_unmount (struct mount *mp, int mntflags);
62 static int fdesc_statfs (struct mount *mp, struct statfs *sbp,
66 * Mount the per-process file descriptors (/dev/fd)
69 fdesc_mount(struct mount *mp, char *path, caddr_t data, struct ucred *cred)
72 struct fdescmount *fmp;
76 panic("fdesc_mount: cannot mount as root");
81 if (mp->mnt_flag & MNT_UPDATE)
84 vfs_add_vnodeops(mp, &fdesc_vnode_vops, &mp->mnt_vn_norm_ops);
86 error = fdesc_allocvp(Froot, FD_ROOT, mp, &rvp);
90 fmp = kmalloc(sizeof(struct fdescmount), M_FDESCMNT, M_WAITOK); /* XXX */
92 vsetflags(rvp, VROOT);
94 /* XXX -- don't mark as local to work around fts() problems */
95 /*mp->mnt_flag |= MNT_LOCAL;*/
96 mp->mnt_data = (qaddr_t) fmp;
99 bzero(mp->mnt_stat.f_mntfromname, MNAMELEN);
100 bcopy("fdesc", mp->mnt_stat.f_mntfromname, sizeof("fdesc"));
101 fdesc_statfs(mp, &mp->mnt_stat, cred);
106 fdesc_unmount(struct mount *mp, int mntflags)
111 if (mntflags & MNT_FORCE)
115 * Clear out buffer cache. I don't think we
116 * ever get anything cached at this level at the
117 * moment, but who knows...
119 * There is 1 extra root vnode reference corresponding
122 if ((error = vflush(mp, 1, flags)) != 0)
126 * Finally, throw away the fdescmount structure
128 kfree(mp->mnt_data, M_FDESCMNT); /* XXX */
135 fdesc_root(struct mount *mp, struct vnode **vpp)
141 * Return locked reference to root.
143 vp = VFSTOFDESC(mp)->f_root;
144 error = vget(vp, LK_EXCLUSIVE | LK_RETRY);
151 fdesc_statfs(struct mount *mp, struct statfs *sbp, struct ucred *cred)
154 sbp->f_bsize = DEV_BSIZE;
155 sbp->f_iosize = DEV_BSIZE;
156 sbp->f_blocks = 2; /* 1K to keep df happy */
159 sbp->f_files = 0; /* dummy up these fields */
161 if (sbp != &mp->mnt_stat) {
162 sbp->f_type = mp->mnt_vfc->vfc_typenum;
163 bcopy(&mp->mnt_stat.f_fsid, &sbp->f_fsid, sizeof(sbp->f_fsid));
164 bcopy(mp->mnt_stat.f_mntfromname, sbp->f_mntfromname, MNAMELEN);
169 static struct vfsops fdesc_vfsops = {
170 .vfs_mount = fdesc_mount,
171 .vfs_unmount = fdesc_unmount,
172 .vfs_root = fdesc_root,
173 .vfs_statfs = fdesc_statfs,
174 .vfs_sync = vfs_stdsync,
175 .vfs_init = fdesc_init,
176 .vfs_uninit = fdesc_uninit
179 VFS_SET(fdesc_vfsops, fdesc, VFCF_SYNTHETIC);
180 MODULE_VERSION(fdesc, 1);