2 * Copyright (c) 2009 The DragonFly Project. All rights reserved.
4 * This code is derived from software contributed to The DragonFly Project
5 * by Alex Hornung <ahornung@gmail.com>
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
11 * 1. Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in
15 * the documentation and/or other materials provided with the
17 * 3. Neither the name of The DragonFly Project nor the names of its
18 * contributors may be used to endorse or promote products derived
19 * from this software without specific, prior written permission.
21 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
22 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
23 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
24 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
25 * COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
26 * INCIDENTAL, SPECIAL, EXEMPLARY OR CONSEQUENTIAL DAMAGES (INCLUDING,
27 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
28 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
29 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
30 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
31 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
34 #include <sys/param.h>
35 #include <sys/systm.h>
36 #include <sys/kernel.h>
37 #include <sys/mount.h>
38 #include <sys/vnode.h>
41 #include <sys/devfs.h>
43 MALLOC_DECLARE(M_DEVFS);
45 extern struct vop_ops devfs_vnode_norm_vops;
46 extern struct vop_ops devfs_vnode_dev_vops;
47 extern struct lock devfs_lock;
49 static int devfs_mount (struct mount *mp, char *path, caddr_t data,
51 static int devfs_statfs (struct mount *mp, struct statfs *sbp,
53 static int devfs_unmount (struct mount *mp, int mntflags);
54 int devfs_root(struct mount *mp, struct vnode **vpp);
55 static int devfs_vget(struct mount *mp, struct vnode *dvp,
56 ino_t ino, struct vnode **vpp);
57 static int devfs_fhtovp(struct mount *mp, struct vnode *rootvp,
58 struct fid *fhp, struct vnode **vpp);
59 static int devfs_vptofh(struct vnode *vp, struct fid *fhp);
69 devfs_mount(struct mount *mp, char *path, caddr_t data, struct ucred *cred)
71 struct devfs_mount_info info;
72 struct devfs_mnt_data *mnt;
76 devfs_debug(DEVFS_DEBUG_DEBUG, "(vfsops) devfs_mount() called!\n");
78 if (mp->mnt_flag & MNT_UPDATE)
82 bzero(&info, sizeof(info));
84 if ((error = copyin(data, &info, sizeof(info))) != 0)
88 mp->mnt_flag |= MNT_LOCAL;
89 mp->mnt_kern_flag |= MNTK_NOSTKMNT;
93 size = sizeof("devfs") - 1;
94 bcopy("devfs", mp->mnt_stat.f_mntfromname, size);
95 bzero(mp->mnt_stat.f_mntfromname + size, MNAMELEN - size);
96 devfs_statfs(mp, &mp->mnt_stat, cred);
99 * XXX: save other mount info passed from userland or so.
101 mnt = kmalloc(sizeof(*mnt), M_DEVFS, M_WAITOK | M_ZERO);
103 lockmgr(&devfs_lock, LK_EXCLUSIVE);
104 mp->mnt_data = (qaddr_t)mnt;
106 if (info.flags & DEVFS_MNT_JAIL)
109 mnt->jailed = jailed(cred);
114 TAILQ_INIT(&mnt->orphan_list);
115 mnt->root_node = devfs_allocp(Proot, "", NULL, mp, NULL);
116 KKASSERT(mnt->root_node);
117 lockmgr(&devfs_lock, LK_RELEASE);
119 vfs_add_vnodeops(mp, &devfs_vnode_norm_vops, &mp->mnt_vn_norm_ops);
120 vfs_add_vnodeops(mp, &devfs_vnode_dev_vops, &mp->mnt_vn_spec_ops);
122 devfs_debug(DEVFS_DEBUG_DEBUG, "calling devfs_mount_add\n");
123 devfs_mount_add(mnt);
129 * unmount system call
132 devfs_unmount(struct mount *mp, int mntflags)
137 devfs_debug(DEVFS_DEBUG_DEBUG, "(vfsops) devfs_unmount() called!\n");
139 if (mntflags & MNT_FORCE)
142 error = vflush(mp, 0, flags);
146 devfs_tracer_orphan_count(mp, 1);
147 devfs_mount_del(DEVFS_MNTDATA(mp));
148 kfree(mp->mnt_data, M_DEVFS);
155 * Sets *vpp to the root procfs vnode, referenced and exclusively locked
158 devfs_root(struct mount *mp, struct vnode **vpp)
161 devfs_debug(DEVFS_DEBUG_DEBUG, "(vfsops) devfs_root() called!\n");
162 lockmgr(&devfs_lock, LK_EXCLUSIVE);
163 ret = devfs_allocv(vpp, DEVFS_MNTDATA(mp)->root_node);
164 lockmgr(&devfs_lock, LK_RELEASE);
169 * Get file system statistics.
172 devfs_statfs(struct mount *mp, struct statfs *sbp, struct ucred *cred)
174 devfs_debug(DEVFS_DEBUG_DEBUG, "(vfsops) devfs_stat() called!\n");
175 sbp->f_bsize = DEV_BSIZE;
176 sbp->f_iosize = DEV_BSIZE;
177 sbp->f_blocks = 2; /* avoid divide by zero in some df's */
180 sbp->f_files = (DEVFS_MNTDATA(mp))?(DEVFS_MNTDATA(mp)->file_count):0;
183 if (sbp != &mp->mnt_stat) {
184 sbp->f_type = mp->mnt_vfc->vfc_typenum;
185 bcopy(&mp->mnt_stat.f_fsid, &sbp->f_fsid, sizeof(sbp->f_fsid));
186 bcopy(mp->mnt_stat.f_mntfromname, sbp->f_mntfromname, MNAMELEN);
193 devfs_fhtovp(struct mount *mp, struct vnode *rootvp,
194 struct fid *fhp, struct vnode **vpp)
197 struct devfs_fid *dfhp;
199 dfhp = (struct devfs_fid *)fhp;
201 if (dfhp->fid_gen != boottime.tv_sec)
204 vp = devfs_inode_to_vnode(mp, dfhp->fid_ino);
214 * Vnode pointer to File handle
218 devfs_vptofh(struct vnode *vp, struct fid *fhp)
220 struct devfs_node *node;
221 struct devfs_fid *dfhp;
223 if ((node = DEVFS_NODE(vp)) != NULL) {
224 dfhp = (struct devfs_fid *)fhp;
225 dfhp->fid_len = sizeof(struct devfs_fid);
226 dfhp->fid_ino = node->d_dir.d_ino;
227 dfhp->fid_gen = boottime.tv_sec;
236 devfs_vget(struct mount *mp, struct vnode *dvp, ino_t ino, struct vnode **vpp)
239 vp = devfs_inode_to_vnode(mp, ino);
249 static struct vfsops devfs_vfsops = {
250 .vfs_mount = devfs_mount,
251 .vfs_unmount = devfs_unmount,
252 .vfs_root = devfs_root,
253 .vfs_statfs = devfs_statfs,
254 .vfs_sync = vfs_stdsync,
255 .vfs_vget = devfs_vget,
256 .vfs_vptofh = devfs_vptofh,
257 .vfs_fhtovp = devfs_fhtovp
260 VFS_SET(devfs_vfsops, devfs, VFCF_SYNTHETIC);
261 MODULE_VERSION(devfs, 1);