2 * Copyright (c) 1992, 1993, 1995
3 * The Regents of the University of California. All rights reserved.
5 * Poul-Henning Kamp. All rights reserved.
7 * This code is derived from software donated to Berkeley by
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31 * @(#)kernfs_vfsops.c 8.10 (Berkeley) 5/14/95
32 * From: FreeBSD: src/sys/miscfs/kernfs/kernfs_vfsops.c 1.36
37 #include <sys/param.h>
38 #include <sys/systm.h>
39 #include <sys/kernel.h>
41 #include <sys/malloc.h>
42 #include <sys/mount.h>
45 #include <sys/vnode.h>
46 #include <sys/limits.h>
48 #include <fs/devfs/devfs.h>
50 static struct unrhdr *devfs_unr;
52 MALLOC_DEFINE(M_DEVFS, "DEVFS", "DEVFS data");
54 static vfs_mount_t devfs_mount;
55 static vfs_unmount_t devfs_unmount;
56 static vfs_root_t devfs_root;
57 static vfs_statfs_t devfs_statfs;
60 * Mount the filesystem
63 devfs_mount(struct mount *mp, struct thread *td)
66 struct devfs_mount *fmp;
69 if (devfs_unr == NULL)
70 devfs_unr = new_unrhdr(0, INT_MAX, NULL);
74 if (mp->mnt_flag & (MNT_UPDATE | MNT_ROOTFS))
77 fmp = malloc(sizeof *fmp, M_DEVFS, M_WAITOK | M_ZERO);
78 fmp->dm_idx = alloc_unr(devfs_unr);
79 sx_init(&fmp->dm_lock, "devfsmount");
83 mp->mnt_flag |= MNT_LOCAL;
84 mp->mnt_kern_flag |= MNTK_MPSAFE;
86 mp->mnt_flag |= MNT_MULTILABEL;
90 mp->mnt_data = (void *) fmp;
93 fmp->dm_rootdir = devfs_vmkdir(fmp, NULL, 0, NULL, DEVFS_ROOTINO);
95 error = devfs_root(mp, LK_EXCLUSIVE, &rvp, td);
97 sx_destroy(&fmp->dm_lock);
98 free_unr(devfs_unr, fmp->dm_idx);
103 VOP_UNLOCK(rvp, 0, td);
105 vfs_mountedfrom(mp, "devfs");
111 devfs_unmount_final(struct devfs_mount *fmp)
113 sx_destroy(&fmp->dm_lock);
118 devfs_unmount(struct mount *mp, int mntflags, struct thread *td)
122 struct devfs_mount *fmp;
126 fmp = VFSTODEVFS(mp);
127 KASSERT(fmp->dm_mount != NULL,
128 ("devfs_unmount unmounted devfs_mount"));
129 /* There is 1 extra root vnode reference from devfs_mount(). */
130 error = vflush(mp, 1, flags, td);
133 sx_xlock(&fmp->dm_lock);
135 devfs_rules_cleanup(fmp);
136 fmp->dm_mount = NULL;
137 hold = --fmp->dm_holdcnt;
140 sx_xunlock(&fmp->dm_lock);
141 free_unr(devfs_unr, idx);
143 devfs_unmount_final(fmp);
147 /* Return locked reference to root. */
150 devfs_root(struct mount *mp, int flags, struct vnode **vpp, struct thread *td)
154 struct devfs_mount *dmp;
156 dmp = VFSTODEVFS(mp);
157 sx_xlock(&dmp->dm_lock);
158 error = devfs_allocv(dmp->dm_rootdir, mp, &vp, td);
161 vp->v_vflag |= VV_ROOT;
167 devfs_statfs(struct mount *mp, struct statfs *sbp, struct thread *td)
171 sbp->f_bsize = DEV_BSIZE;
172 sbp->f_iosize = DEV_BSIZE;
173 sbp->f_blocks = 2; /* 1K to keep df happy */
181 static struct vfsops devfs_vfsops = {
182 .vfs_mount = devfs_mount,
183 .vfs_root = devfs_root,
184 .vfs_statfs = devfs_statfs,
185 .vfs_unmount = devfs_unmount,
188 VFS_SET(devfs_vfsops, devfs, VFCF_SYNTHETIC);