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36 * @(#)fdesc_vfsops.c 8.4 (Berkeley) 1/21/94
38 * $Id: fdesc_vfsops.c,v 1.13 1997/10/12 20:24:39 phk Exp $
45 #include <sys/param.h>
46 #include <sys/systm.h>
47 #include <sys/kernel.h>
49 #include <sys/resourcevar.h>
50 #include <sys/filedesc.h>
51 #include <sys/vnode.h>
52 #include <sys/mount.h>
53 #include <sys/malloc.h>
54 #include <miscfs/fdesc/fdesc.h>
56 static MALLOC_DEFINE(M_FDESCMNT, "FDESC mount", "FDESC mount structure");
58 static int fdesc_fhtovp __P((struct mount *mp, struct fid *fhp,
59 struct mbuf *nam, struct vnode **vpp,
60 int *exflagsp, struct ucred **credanonp));
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_quotactl __P((struct mount *mp, int cmd, uid_t uid,
64 caddr_t arg, struct proc *p));
65 static int fdesc_start __P((struct mount *mp, int flags, struct proc *p));
66 static int fdesc_unmount __P((struct mount *mp, int mntflags,
68 static int fdesc_statfs __P((struct mount *mp, struct statfs *sbp,
70 static int fdesc_sync __P((struct mount *mp, int waitfor,
71 struct ucred *cred, struct proc *p));
72 static int fdesc_vget __P((struct mount *mp, ino_t ino,
74 static int fdesc_vrele __P((struct mount *mp, struct vnode *vp));
75 static int fdesc_vptofh __P((struct vnode *vp, struct fid *fhp));
78 * Mount the per-process file descriptors (/dev/fd)
81 fdesc_mount(mp, path, data, ndp, p)
85 struct nameidata *ndp;
90 struct fdescmount *fmp;
96 if (mp->mnt_flag & MNT_UPDATE)
99 error = fdesc_allocvp(Froot, FD_ROOT, mp, &rvp);
103 MALLOC(fmp, struct fdescmount *, sizeof(struct fdescmount),
104 M_FDESCMNT, M_WAITOK); /* XXX */
106 rvp->v_flag |= VROOT;
108 /* XXX -- don't mark as local to work around fts() problems */
109 /*mp->mnt_flag |= MNT_LOCAL;*/
110 mp->mnt_data = (qaddr_t) fmp;
113 (void) copyinstr(path, mp->mnt_stat.f_mntonname, MNAMELEN - 1, &size);
114 bzero(mp->mnt_stat.f_mntonname + size, MNAMELEN - size);
115 bzero(mp->mnt_stat.f_mntfromname, MNAMELEN);
116 bcopy("fdesc", mp->mnt_stat.f_mntfromname, sizeof("fdesc"));
117 (void)fdesc_statfs(mp, &mp->mnt_stat, p);
122 fdesc_start(mp, flags, p)
131 fdesc_unmount(mp, mntflags, p)
138 struct vnode *rootvp = VFSTOFDESC(mp)->f_root;
140 if (mntflags & MNT_FORCE)
144 * Clear out buffer cache. I don't think we
145 * ever get anything cached at this level at the
146 * moment, but who knows...
148 if (rootvp->v_usecount > 1)
150 if (error = vflush(mp, rootvp, flags))
154 * Release reference on underlying root vnode
158 * And blow it away for future re-use
162 * Finally, throw away the fdescmount structure
164 free(mp->mnt_data, M_FDESCMNT); /* XXX */
175 struct proc *p = curproc; /* XXX */
179 * Return locked reference to root.
181 vp = VFSTOFDESC(mp)->f_root;
183 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY, p);
189 fdesc_statfs(mp, sbp, p)
194 struct filedesc *fdp;
201 * Compute number of free file descriptors.
202 * [ Strange results will ensue if the open file
203 * limit is ever reduced below the current number
206 lim = p->p_rlimit[RLIMIT_NOFILE].rlim_cur;
208 last = min(fdp->fd_nfiles, lim);
210 for (i = fdp->fd_freefile; i < last; i++)
211 if (fdp->fd_ofiles[i] == NULL)
215 * Adjust for the fact that the fdesc array may not
216 * have been fully allocated yet.
218 if (fdp->fd_nfiles < lim)
219 freefd += (lim - fdp->fd_nfiles);
222 sbp->f_bsize = DEV_BSIZE;
223 sbp->f_iosize = DEV_BSIZE;
224 sbp->f_blocks = 2; /* 1K to keep df happy */
227 sbp->f_files = lim + 1; /* Allow for "." */
228 sbp->f_ffree = freefd; /* See comments above */
229 if (sbp != &mp->mnt_stat) {
230 sbp->f_type = mp->mnt_vfc->vfc_typenum;
231 bcopy(&mp->mnt_stat.f_fsid, &sbp->f_fsid, sizeof(sbp->f_fsid));
232 bcopy(mp->mnt_stat.f_mntonname, sbp->f_mntonname, MNAMELEN);
233 bcopy(mp->mnt_stat.f_mntfromname, sbp->f_mntfromname, MNAMELEN);
239 fdesc_sync(mp, waitfor, cred, p)
249 #define fdesc_fhtovp ((int (*) __P((struct mount *, struct fid *, \
250 struct sockaddr *, struct vnode **, int *, struct ucred **)))eopnotsupp)
251 #define fdesc_quotactl ((int (*) __P((struct mount *, int, uid_t, caddr_t, \
252 struct proc *)))eopnotsupp)
253 #define fdesc_sysctl ((int (*) __P((int *, u_int, void *, size_t *, void *, \
254 size_t, struct proc *)))eopnotsupp)
255 #define fdesc_vget ((int (*) __P((struct mount *, ino_t, struct vnode **))) \
257 #define fdesc_vrele ((int (*) __P((struct mount *, struct vnode *))) \
259 #define fdesc_vptofh ((int (*) __P((struct vnode *, struct fid *)))eopnotsupp)
261 static struct vfsops fdesc_vfsops = {
276 VFS_SET(fdesc_vfsops, fdesc, MOUNT_FDESC, VFCF_SYNTHETIC);