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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>
57 #include <miscfs/fdesc/fdesc.h>
59 static MALLOC_DEFINE(M_FDESCMNT, "FDESC mount", "FDESC mount structure");
61 static int fdesc_mount __P((struct mount *mp, char *path, caddr_t data,
62 struct nameidata *ndp, struct proc *p));
63 static int fdesc_unmount __P((struct mount *mp, int mntflags,
65 static int fdesc_statfs __P((struct mount *mp, struct statfs *sbp,
69 * Mount the per-process file descriptors (/dev/fd)
72 fdesc_mount(mp, path, data, ndp, p)
76 struct nameidata *ndp;
80 struct fdescmount *fmp;
85 panic("fdesc_mount: cannot mount as root");
90 if (mp->mnt_flag & MNT_UPDATE)
93 error = fdesc_allocvp(Froot, FD_ROOT, mp, &rvp, p);
97 MALLOC(fmp, struct fdescmount *, sizeof(struct fdescmount),
98 M_FDESCMNT, M_WAITOK); /* XXX */
100 rvp->v_flag |= VROOT;
102 /* XXX -- don't mark as local to work around fts() problems */
103 /*mp->mnt_flag |= MNT_LOCAL;*/
104 mp->mnt_data = (qaddr_t) fmp;
107 (void) copyinstr(path, mp->mnt_stat.f_mntonname, MNAMELEN - 1, &size);
108 bzero(mp->mnt_stat.f_mntonname + size, MNAMELEN - size);
109 bzero(mp->mnt_stat.f_mntfromname, MNAMELEN);
110 bcopy("fdesc", mp->mnt_stat.f_mntfromname, sizeof("fdesc"));
111 (void)fdesc_statfs(mp, &mp->mnt_stat, p);
116 fdesc_unmount(mp, mntflags, p)
124 if (mntflags & MNT_FORCE)
128 * Clear out buffer cache. I don't think we
129 * ever get anything cached at this level at the
130 * moment, but who knows...
132 * There is 1 extra root vnode reference corresponding
135 if ((error = vflush(mp, 1, flags)) != 0)
139 * Finally, throw away the fdescmount structure
141 free(mp->mnt_data, M_FDESCMNT); /* XXX */
152 struct proc *p = curproc; /* XXX */
156 * Return locked reference to root.
158 vp = VFSTOFDESC(mp)->f_root;
160 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY, p);
166 fdesc_statfs(mp, sbp, p)
171 struct filedesc *fdp;
178 * Compute number of free file descriptors.
179 * [ Strange results will ensue if the open file
180 * limit is ever reduced below the current number
183 lim = p->p_rlimit[RLIMIT_NOFILE].rlim_cur;
185 last = min(fdp->fd_nfiles, lim);
187 for (i = fdp->fd_freefile; i < last; i++)
188 if (fdp->fd_ofiles[i] == NULL)
192 * Adjust for the fact that the fdesc array may not
193 * have been fully allocated yet.
195 if (fdp->fd_nfiles < lim)
196 freefd += (lim - fdp->fd_nfiles);
199 sbp->f_bsize = DEV_BSIZE;
200 sbp->f_iosize = DEV_BSIZE;
201 sbp->f_blocks = 2; /* 1K to keep df happy */
204 sbp->f_files = lim + 1; /* Allow for "." */
205 sbp->f_ffree = freefd; /* See comments above */
206 if (sbp != &mp->mnt_stat) {
207 sbp->f_type = mp->mnt_vfc->vfc_typenum;
208 bcopy(&mp->mnt_stat.f_fsid, &sbp->f_fsid, sizeof(sbp->f_fsid));
209 bcopy(mp->mnt_stat.f_mntonname, sbp->f_mntonname, MNAMELEN);
210 bcopy(mp->mnt_stat.f_mntfromname, sbp->f_mntfromname, MNAMELEN);
215 static struct vfsops fdesc_vfsops = {
232 VFS_SET(fdesc_vfsops, fdesc, VFCF_SYNTHETIC);