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36 * @(#)fdesc_vfsops.c 8.4 (Berkeley) 1/21/94
38 * $FreeBSD: src/sys/miscfs/fdesc/fdesc_vfsops.c,v 1.22.2.3 2002/08/23 17:42:39 njl Exp $
45 #include <sys/param.h>
46 #include <sys/systm.h>
47 #include <sys/filedesc.h>
48 #include <sys/kernel.h>
50 #include <sys/malloc.h>
51 #include <sys/mount.h>
53 #include <sys/resourcevar.h>
54 #include <sys/socket.h>
55 #include <sys/vnode.h>
59 extern struct vop_ops fdesc_vnode_vops;
61 static MALLOC_DEFINE(M_FDESCMNT, "FDESC mount", "FDESC mount structure");
63 static int fdesc_mount (struct mount *mp, char *path, caddr_t data,
65 static int fdesc_unmount (struct mount *mp, int mntflags);
66 static int fdesc_statfs (struct mount *mp, struct statfs *sbp,
70 * Mount the per-process file descriptors (/dev/fd)
73 fdesc_mount(struct mount *mp, char *path, caddr_t data, struct ucred *cred)
76 struct fdescmount *fmp;
80 panic("fdesc_mount: cannot mount as root");
85 if (mp->mnt_flag & MNT_UPDATE)
88 vfs_add_vnodeops(mp, &fdesc_vnode_vops, &mp->mnt_vn_norm_ops);
90 error = fdesc_allocvp(Froot, FD_ROOT, mp, &rvp);
94 fmp = kmalloc(sizeof(struct fdescmount), M_FDESCMNT, M_WAITOK); /* XXX */
96 vsetflags(rvp, VROOT);
98 /* XXX -- don't mark as local to work around fts() problems */
99 /*mp->mnt_flag |= MNT_LOCAL;*/
100 mp->mnt_data = (qaddr_t) fmp;
103 bzero(mp->mnt_stat.f_mntfromname, MNAMELEN);
104 bcopy("fdesc", mp->mnt_stat.f_mntfromname, sizeof("fdesc"));
105 fdesc_statfs(mp, &mp->mnt_stat, cred);
110 fdesc_unmount(struct mount *mp, int mntflags)
115 if (mntflags & MNT_FORCE)
119 * Clear out buffer cache. I don't think we
120 * ever get anything cached at this level at the
121 * moment, but who knows...
123 * There is 1 extra root vnode reference corresponding
126 if ((error = vflush(mp, 1, flags)) != 0)
130 * Finally, throw away the fdescmount structure
132 kfree(mp->mnt_data, M_FDESCMNT); /* XXX */
139 fdesc_root(struct mount *mp, struct vnode **vpp)
145 * Return locked reference to root.
147 vp = VFSTOFDESC(mp)->f_root;
148 error = vget(vp, LK_EXCLUSIVE | LK_RETRY);
155 fdesc_statfs(struct mount *mp, struct statfs *sbp, struct ucred *cred)
158 sbp->f_bsize = DEV_BSIZE;
159 sbp->f_iosize = DEV_BSIZE;
160 sbp->f_blocks = 2; /* 1K to keep df happy */
163 sbp->f_files = 0; /* dummy up these fields */
165 if (sbp != &mp->mnt_stat) {
166 sbp->f_type = mp->mnt_vfc->vfc_typenum;
167 bcopy(&mp->mnt_stat.f_fsid, &sbp->f_fsid, sizeof(sbp->f_fsid));
168 bcopy(mp->mnt_stat.f_mntfromname, sbp->f_mntfromname, MNAMELEN);
173 static struct vfsops fdesc_vfsops = {
174 .vfs_mount = fdesc_mount,
175 .vfs_unmount = fdesc_unmount,
176 .vfs_root = fdesc_root,
177 .vfs_statfs = fdesc_statfs,
178 .vfs_sync = vfs_stdsync,
179 .vfs_init = fdesc_init,
180 .vfs_uninit = fdesc_uninit
183 VFS_SET(fdesc_vfsops, fdesc, VFCF_SYNTHETIC);
184 MODULE_VERSION(fdesc, 1);