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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 $
39 * $DragonFly: src/sys/vfs/fdesc/fdesc_vfsops.c,v 1.10 2004/10/12 19:20:53 dillon Exp $
46 #include <sys/param.h>
47 #include <sys/systm.h>
48 #include <sys/filedesc.h>
49 #include <sys/kernel.h>
51 #include <sys/malloc.h>
52 #include <sys/mount.h>
54 #include <sys/resourcevar.h>
55 #include <sys/socket.h>
56 #include <sys/vnode.h>
60 extern struct vnodeopv_entry_desc fdesc_vnodeop_entries[];
62 static MALLOC_DEFINE(M_FDESCMNT, "FDESC mount", "FDESC mount structure");
64 static int fdesc_mount (struct mount *mp, char *path, caddr_t data,
66 static int fdesc_unmount (struct mount *mp, int mntflags,
68 static int fdesc_statfs (struct mount *mp, struct statfs *sbp,
72 * Mount the per-process file descriptors (/dev/fd)
75 fdesc_mount(struct mount *mp, char *path, caddr_t data, struct thread *td)
78 struct fdescmount *fmp;
83 panic("fdesc_mount: cannot mount as root");
88 if (mp->mnt_flag & MNT_UPDATE)
91 vfs_add_vnodeops(&mp->mnt_vn_ops, fdesc_vnodeop_entries);
93 error = fdesc_allocvp(Froot, FD_ROOT, mp, &rvp, td);
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, td);
116 fdesc_unmount(struct mount *mp, int mntflags, struct thread *td)
121 if (mntflags & MNT_FORCE)
125 * Clear out buffer cache. I don't think we
126 * ever get anything cached at this level at the
127 * moment, but who knows...
129 * There is 1 extra root vnode reference corresponding
132 if ((error = vflush(mp, 1, flags)) != 0)
136 * Finally, throw away the fdescmount structure
138 free(mp->mnt_data, M_FDESCMNT); /* XXX */
145 fdesc_root(struct mount *mp, struct vnode **vpp)
147 struct thread *td = curthread; /* XXX */
151 * Return locked reference to root.
153 vp = VFSTOFDESC(mp)->f_root;
155 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY, td);
161 fdesc_statfs(struct mount *mp, struct statfs *sbp, struct thread *td)
163 struct proc *p = td->td_proc;
164 struct filedesc *fdp;
173 * Compute number of free file descriptors.
174 * [ Strange results will ensue if the open file
175 * limit is ever reduced below the current number
178 lim = p->p_rlimit[RLIMIT_NOFILE].rlim_cur;
180 last = min(fdp->fd_nfiles, lim);
182 for (i = fdp->fd_freefile; i < last; i++)
183 if (fdp->fd_ofiles[i] == NULL)
187 * Adjust for the fact that the fdesc array may not
188 * have been fully allocated yet.
190 if (fdp->fd_nfiles < lim)
191 freefd += (lim - fdp->fd_nfiles);
194 sbp->f_bsize = DEV_BSIZE;
195 sbp->f_iosize = DEV_BSIZE;
196 sbp->f_blocks = 2; /* 1K to keep df happy */
199 sbp->f_files = lim + 1; /* Allow for "." */
200 sbp->f_ffree = freefd; /* See comments above */
201 if (sbp != &mp->mnt_stat) {
202 sbp->f_type = mp->mnt_vfc->vfc_typenum;
203 bcopy(&mp->mnt_stat.f_fsid, &sbp->f_fsid, sizeof(sbp->f_fsid));
204 bcopy(mp->mnt_stat.f_mntonname, sbp->f_mntonname, MNAMELEN);
205 bcopy(mp->mnt_stat.f_mntfromname, sbp->f_mntfromname, MNAMELEN);
210 static struct vfsops fdesc_vfsops = {
227 VFS_SET(fdesc_vfsops, fdesc, VFCF_SYNTHETIC);