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 <vfs/devfs/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_mnt_data *mnt;
74 devfs_debug(DEVFS_DEBUG_DEBUG, "(vfsops) devfs_mount() called!\n");
76 if (mp->mnt_flag & MNT_UPDATE)
80 mp->mnt_flag |= MNT_LOCAL;
81 mp->mnt_kern_flag |= MNTK_NOSTKMNT;
85 size = sizeof("devfs") - 1;
86 bcopy("devfs", mp->mnt_stat.f_mntfromname, size);
87 bzero(mp->mnt_stat.f_mntfromname + size, MNAMELEN - size);
88 devfs_statfs(mp, &mp->mnt_stat, cred);
90 //XXX: save other mount info passed from userland or so.
91 mnt = kmalloc(sizeof(*mnt), M_DEVFS, M_WAITOK | M_ZERO);
93 lockmgr(&devfs_lock, LK_EXCLUSIVE);
94 mp->mnt_data = (qaddr_t)mnt;
95 mnt->jailed = jailed(cred);
98 TAILQ_INIT(&mnt->orphan_list);
99 mnt->mntonnamelen = strlen(mp->mnt_stat.f_mntonname);
100 mnt->root_node = devfs_allocp(Proot, "", NULL, mp, NULL);
101 KKASSERT(mnt->root_node);
102 lockmgr(&devfs_lock, LK_RELEASE);
104 vfs_add_vnodeops(mp, &devfs_vnode_norm_vops, &mp->mnt_vn_norm_ops);
105 vfs_add_vnodeops(mp, &devfs_vnode_dev_vops, &mp->mnt_vn_spec_ops);
107 devfs_debug(DEVFS_DEBUG_DEBUG, "calling devfs_mount_add\n");
108 devfs_mount_add(mnt);
114 * unmount system call
117 devfs_unmount(struct mount *mp, int mntflags)
122 devfs_debug(DEVFS_DEBUG_DEBUG, "(vfsops) devfs_unmount() called!\n");
124 if (mntflags & MNT_FORCE)
127 error = vflush(mp, 0, flags);
131 devfs_tracer_orphan_count(mp, 1);
132 devfs_mount_del(DEVFS_MNTDATA(mp));
133 kfree(mp->mnt_data, M_DEVFS);
140 * Sets *vpp to the root procfs vnode, referenced and exclusively locked
143 devfs_root(struct mount *mp, struct vnode **vpp)
146 devfs_debug(DEVFS_DEBUG_DEBUG, "(vfsops) devfs_root() called!\n");
147 lockmgr(&devfs_lock, LK_EXCLUSIVE);
148 ret = devfs_allocv(vpp, DEVFS_MNTDATA(mp)->root_node);
149 lockmgr(&devfs_lock, LK_RELEASE);
154 * Get file system statistics.
157 devfs_statfs(struct mount *mp, struct statfs *sbp, struct ucred *cred)
159 devfs_debug(DEVFS_DEBUG_DEBUG, "(vfsops) devfs_stat() called!\n");
160 sbp->f_bsize = DEV_BSIZE;
161 sbp->f_iosize = DEV_BSIZE;
162 sbp->f_blocks = 2; /* avoid divide by zero in some df's */
168 if (sbp != &mp->mnt_stat) {
169 sbp->f_type = mp->mnt_vfc->vfc_typenum;
170 bcopy(&mp->mnt_stat.f_fsid, &sbp->f_fsid, sizeof(sbp->f_fsid));
171 bcopy(mp->mnt_stat.f_mntfromname, sbp->f_mntfromname, MNAMELEN);
178 devfs_fhtovp(struct mount *mp, struct vnode *rootvp,
179 struct fid *fhp, struct vnode **vpp)
182 struct devfs_fid *dfhp;
184 dfhp = (struct devfs_fid *)fhp;
186 if (dfhp->fid_gen != boottime.tv_sec)
189 vp = devfs_inode_to_vnode(mp, dfhp->fid_ino);
201 * Vnode pointer to File handle
205 devfs_vptofh(struct vnode *vp, struct fid *fhp)
207 struct devfs_node *node;
208 struct devfs_fid *dfhp;
210 if ((node = DEVFS_NODE(vp)) != NULL) {
211 dfhp = (struct devfs_fid *)fhp;
212 dfhp->fid_len = sizeof(struct devfs_fid);
213 dfhp->fid_ino = node->d_dir.d_ino;
214 dfhp->fid_gen = boottime.tv_sec;
223 devfs_vget(struct mount *mp, struct vnode *dvp, ino_t ino, struct vnode **vpp)
226 vp = devfs_inode_to_vnode(mp, ino);
230 /* XXX: Maybe lock or ref? */
239 static struct vfsops devfs_vfsops = {
240 .vfs_mount = devfs_mount,
241 .vfs_unmount = devfs_unmount,
242 .vfs_root = devfs_root,
243 .vfs_statfs = devfs_statfs,
244 .vfs_sync = vfs_stdsync,
245 .vfs_vget = devfs_vget,
246 .vfs_vptofh = devfs_vptofh,
247 .vfs_fhtovp = devfs_fhtovp
250 VFS_SET(devfs_vfsops, devfs, VFCF_SYNTHETIC);
251 MODULE_VERSION(devfs, 1);