4 * Copyright (c) 2009 The DragonFly Project. All rights reserved.
6 * This code is derived from software contributed to The DragonFly Project
7 * by Alex Hornung <ahornung@gmail.com>
9 * Redistribution and use in source and binary forms, with or without
10 * modification, are permitted provided that the following conditions
13 * 1. Redistributions of source code must retain the above copyright
14 * notice, this list of conditions and the following disclaimer.
15 * 2. Redistributions in binary form must reproduce the above copyright
16 * notice, this list of conditions and the following disclaimer in
17 * the documentation and/or other materials provided with the
19 * 3. Neither the name of The DragonFly Project nor the names of its
20 * contributors may be used to endorse or promote products derived
21 * from this software without specific, prior written permission.
23 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
24 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
25 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
26 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
27 * COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
28 * INCIDENTAL, SPECIAL, EXEMPLARY OR CONSEQUENTIAL DAMAGES (INCLUDING,
29 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
30 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
31 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
32 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
33 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
36 #include <sys/param.h>
37 #include <sys/systm.h>
38 #include <sys/kernel.h>
39 #include <sys/mount.h>
40 #include <sys/vnode.h>
43 #include <sys/devfs.h>
45 MALLOC_DECLARE(M_DEVFS);
47 extern struct vop_ops devfs_vnode_norm_vops;
48 extern struct vop_ops devfs_vnode_dev_vops;
49 extern struct lock devfs_lock;
51 static int devfs_vfs_mount (struct mount *mp, char *path, caddr_t data,
53 static int devfs_vfs_statfs (struct mount *mp, struct statfs *sbp,
55 static int devfs_vfs_unmount (struct mount *mp, int mntflags);
56 int devfs_vfs_root(struct mount *mp, struct vnode **vpp);
57 static int devfs_vfs_vget(struct mount *mp, struct vnode *dvp,
58 ino_t ino, struct vnode **vpp);
59 static int devfs_vfs_fhtovp(struct mount *mp, struct vnode *rootvp,
60 struct fid *fhp, struct vnode **vpp);
61 static int devfs_vfs_vptofh(struct vnode *vp, struct fid *fhp);
70 devfs_vfs_mount(struct mount *mp, char *path, caddr_t data, struct ucred *cred)
72 struct devfs_mount_info info;
73 struct devfs_mnt_data *mnt;
77 devfs_debug(DEVFS_DEBUG_DEBUG, "(vfsops) devfs_mount() called!\n");
79 if (mp->mnt_flag & MNT_UPDATE)
83 bzero(&info, sizeof(info));
85 if ((error = copyin(data, &info, sizeof(info))) != 0)
89 mp->mnt_flag |= MNT_LOCAL;
90 mp->mnt_kern_flag |= MNTK_NOSTKMNT | MNTK_ALL_MPSAFE;
94 size = sizeof("devfs") - 1;
95 bcopy("devfs", mp->mnt_stat.f_mntfromname, size);
96 bzero(mp->mnt_stat.f_mntfromname + size, MNAMELEN - size);
97 copyinstr(path, mp->mnt_stat.f_mntonname,
98 sizeof(mp->mnt_stat.f_mntonname) -1, &size);
99 devfs_vfs_statfs(mp, &mp->mnt_stat, cred);
102 * XXX: save other mount info passed from userland or so.
104 mnt = kmalloc(sizeof(*mnt), M_DEVFS, M_WAITOK | M_ZERO);
106 lockmgr(&devfs_lock, LK_EXCLUSIVE);
107 mp->mnt_data = (qaddr_t)mnt;
109 if (info.flags & DEVFS_MNT_JAIL)
112 mnt->jailed = jailed(cred);
117 TAILQ_INIT(&mnt->orphan_list);
118 mnt->root_node = devfs_allocp(Proot, "", NULL, mp, NULL);
119 KKASSERT(mnt->root_node);
120 lockmgr(&devfs_lock, LK_RELEASE);
122 vfs_add_vnodeops(mp, &devfs_vnode_norm_vops, &mp->mnt_vn_norm_ops);
123 vfs_add_vnodeops(mp, &devfs_vnode_dev_vops, &mp->mnt_vn_spec_ops);
125 devfs_debug(DEVFS_DEBUG_DEBUG, "calling devfs_mount_add\n");
126 devfs_mount_add(mnt);
132 * unmount system call
135 devfs_vfs_unmount(struct mount *mp, int mntflags)
140 devfs_debug(DEVFS_DEBUG_DEBUG, "(vfsops) devfs_unmount() called!\n");
142 if (mntflags & MNT_FORCE)
145 error = vflush(mp, 0, flags);
149 lockmgr(&devfs_lock, LK_EXCLUSIVE);
150 devfs_tracer_orphan_count(mp, 1);
151 lockmgr(&devfs_lock, LK_RELEASE);
152 devfs_mount_del(DEVFS_MNTDATA(mp));
153 kfree(mp->mnt_data, M_DEVFS);
160 * Sets *vpp to the root procfs vnode, referenced and exclusively locked
163 devfs_vfs_root(struct mount *mp, struct vnode **vpp)
167 devfs_debug(DEVFS_DEBUG_DEBUG, "(vfsops) devfs_root() called!\n");
168 lockmgr(&devfs_lock, LK_EXCLUSIVE);
169 ret = devfs_allocv(vpp, DEVFS_MNTDATA(mp)->root_node);
170 lockmgr(&devfs_lock, LK_RELEASE);
176 * Get file system statistics.
179 devfs_vfs_statfs(struct mount *mp, struct statfs *sbp, struct ucred *cred)
181 devfs_debug(DEVFS_DEBUG_DEBUG, "(vfsops) devfs_stat() called!\n");
182 sbp->f_bsize = DEV_BSIZE;
183 sbp->f_iosize = DEV_BSIZE;
184 sbp->f_blocks = 2; /* avoid divide by zero in some df's */
187 sbp->f_files = (DEVFS_MNTDATA(mp))?(DEVFS_MNTDATA(mp)->file_count):0;
190 if (sbp != &mp->mnt_stat) {
191 sbp->f_type = mp->mnt_vfc->vfc_typenum;
192 bcopy(&mp->mnt_stat.f_fsid, &sbp->f_fsid, sizeof(sbp->f_fsid));
193 bcopy(mp->mnt_stat.f_mntfromname, sbp->f_mntfromname, MNAMELEN);
200 devfs_vfs_fhtovp(struct mount *mp, struct vnode *rootvp,
201 struct fid *fhp, struct vnode **vpp)
204 struct devfs_fid *dfhp;
206 dfhp = (struct devfs_fid *)fhp;
208 if (dfhp->fid_gen != boottime.tv_sec)
211 vp = devfs_inode_to_vnode(mp, dfhp->fid_ino);
221 * Vnode pointer to File handle
224 devfs_vfs_vptofh(struct vnode *vp, struct fid *fhp)
226 struct devfs_node *node;
227 struct devfs_fid *dfhp;
229 if ((node = DEVFS_NODE(vp)) != NULL) {
230 dfhp = (struct devfs_fid *)fhp;
231 dfhp->fid_len = sizeof(struct devfs_fid);
232 dfhp->fid_ino = node->d_dir.d_ino;
233 dfhp->fid_gen = boottime.tv_sec;
242 devfs_vfs_vget(struct mount *mp, struct vnode *dvp,
243 ino_t ino, struct vnode **vpp)
246 vp = devfs_inode_to_vnode(mp, ino);
256 static struct vfsops devfs_vfsops = {
257 .vfs_mount = devfs_vfs_mount,
258 .vfs_unmount = devfs_vfs_unmount,
259 .vfs_root = devfs_vfs_root,
260 .vfs_statfs = devfs_vfs_statfs,
261 .vfs_sync = vfs_stdsync,
262 .vfs_vget = devfs_vfs_vget,
263 .vfs_vptofh = devfs_vfs_vptofh,
264 .vfs_fhtovp = devfs_vfs_fhtovp
267 VFS_SET(devfs_vfsops, devfs, VFCF_SYNTHETIC);
268 MODULE_VERSION(devfs, 1);