1 /* 2 * Copyright (c) 2009 The DragonFly Project. All rights reserved. 3 * 4 * This code is derived from software contributed to The DragonFly Project 5 * by Alex Hornung <ahornung@gmail.com> 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 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 16 * distribution. 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. 20 * 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 32 * SUCH DAMAGE. 33 */ 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> 39 #include <sys/jail.h> 40 #include <sys/lock.h> 41 #include <sys/devfs.h> 42 43 MALLOC_DECLARE(M_DEVFS); 44 45 extern struct vop_ops devfs_vnode_norm_vops; 46 extern struct vop_ops devfs_vnode_dev_vops; 47 extern struct lock devfs_lock; 48 49 static int devfs_mount (struct mount *mp, char *path, caddr_t data, 50 struct ucred *cred); 51 static int devfs_statfs (struct mount *mp, struct statfs *sbp, 52 struct ucred *cred); 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); 60 61 62 /* 63 * VFS Operations. 64 * 65 * mount system call 66 */ 67 /* ARGSUSED */ 68 static int 69 devfs_mount(struct mount *mp, char *path, caddr_t data, struct ucred *cred) 70 { 71 struct devfs_mount_info info; 72 struct devfs_mnt_data *mnt; 73 size_t size; 74 int error; 75 76 devfs_debug(DEVFS_DEBUG_DEBUG, "(vfsops) devfs_mount() called!\n"); 77 78 if (mp->mnt_flag & MNT_UPDATE) 79 return (EOPNOTSUPP); 80 81 if (data == NULL) { 82 bzero(&info, sizeof(info)); 83 } else { 84 if ((error = copyin(data, &info, sizeof(info))) != 0) 85 return (error); 86 } 87 88 mp->mnt_flag |= MNT_LOCAL; 89 mp->mnt_kern_flag |= MNTK_NOSTKMNT; 90 mp->mnt_data = NULL; 91 vfs_getnewfsid(mp); 92 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); 97 98 /* 99 * XXX: save other mount info passed from userland or so. 100 */ 101 mnt = kmalloc(sizeof(*mnt), M_DEVFS, M_WAITOK | M_ZERO); 102 103 lockmgr(&devfs_lock, LK_EXCLUSIVE); 104 mp->mnt_data = (qaddr_t)mnt; 105 106 if (info.flags & DEVFS_MNT_JAIL) 107 mnt->jailed = 1; 108 else 109 mnt->jailed = jailed(cred); 110 111 mnt->leak_count = 0; 112 mnt->mp = mp; 113 TAILQ_INIT(&mnt->orphan_list); 114 mnt->root_node = devfs_allocp(Proot, "", NULL, mp, NULL); 115 KKASSERT(mnt->root_node); 116 lockmgr(&devfs_lock, LK_RELEASE); 117 118 vfs_add_vnodeops(mp, &devfs_vnode_norm_vops, &mp->mnt_vn_norm_ops); 119 vfs_add_vnodeops(mp, &devfs_vnode_dev_vops, &mp->mnt_vn_spec_ops); 120 121 devfs_debug(DEVFS_DEBUG_DEBUG, "calling devfs_mount_add\n"); 122 devfs_mount_add(mnt); 123 124 return (0); 125 } 126 127 /* 128 * unmount system call 129 */ 130 static int 131 devfs_unmount(struct mount *mp, int mntflags) 132 { 133 int error = 0; 134 int flags = 0; 135 136 devfs_debug(DEVFS_DEBUG_DEBUG, "(vfsops) devfs_unmount() called!\n"); 137 138 if (mntflags & MNT_FORCE) 139 flags |= FORCECLOSE; 140 141 error = vflush(mp, 0, flags); 142 143 if (error) 144 return (error); 145 devfs_tracer_orphan_count(mp, 1); 146 devfs_mount_del(DEVFS_MNTDATA(mp)); 147 kfree(mp->mnt_data, M_DEVFS); 148 mp->mnt_data = NULL; 149 150 return (0); 151 } 152 153 /* 154 * Sets *vpp to the root procfs vnode, referenced and exclusively locked 155 */ 156 int 157 devfs_root(struct mount *mp, struct vnode **vpp) 158 { 159 int ret; 160 devfs_debug(DEVFS_DEBUG_DEBUG, "(vfsops) devfs_root() called!\n"); 161 lockmgr(&devfs_lock, LK_EXCLUSIVE); 162 ret = devfs_allocv(vpp, DEVFS_MNTDATA(mp)->root_node); 163 lockmgr(&devfs_lock, LK_RELEASE); 164 return ret; 165 } 166 167 /* 168 * Get file system statistics. 169 */ 170 static int 171 devfs_statfs(struct mount *mp, struct statfs *sbp, struct ucred *cred) 172 { 173 devfs_debug(DEVFS_DEBUG_DEBUG, "(vfsops) devfs_stat() called!\n"); 174 sbp->f_bsize = DEV_BSIZE; 175 sbp->f_iosize = DEV_BSIZE; 176 sbp->f_blocks = 2; /* avoid divide by zero in some df's */ 177 sbp->f_bfree = 0; 178 sbp->f_bavail = 0; 179 sbp->f_files = 0; 180 sbp->f_ffree = 0; 181 182 if (sbp != &mp->mnt_stat) { 183 sbp->f_type = mp->mnt_vfc->vfc_typenum; 184 bcopy(&mp->mnt_stat.f_fsid, &sbp->f_fsid, sizeof(sbp->f_fsid)); 185 bcopy(mp->mnt_stat.f_mntfromname, sbp->f_mntfromname, MNAMELEN); 186 } 187 188 return (0); 189 } 190 191 static int 192 devfs_fhtovp(struct mount *mp, struct vnode *rootvp, 193 struct fid *fhp, struct vnode **vpp) 194 { 195 struct vnode *vp; 196 struct devfs_fid *dfhp; 197 198 dfhp = (struct devfs_fid *)fhp; 199 200 if (dfhp->fid_gen != boottime.tv_sec) 201 return EINVAL; 202 203 vp = devfs_inode_to_vnode(mp, dfhp->fid_ino); 204 205 if (vp == NULL) 206 return ENOENT; 207 208 *vpp = vp; 209 return 0; 210 } 211 212 /* 213 * Vnode pointer to File handle 214 */ 215 /* ARGSUSED */ 216 static int 217 devfs_vptofh(struct vnode *vp, struct fid *fhp) 218 { 219 struct devfs_node *node; 220 struct devfs_fid *dfhp; 221 222 if ((node = DEVFS_NODE(vp)) != NULL) { 223 dfhp = (struct devfs_fid *)fhp; 224 dfhp->fid_len = sizeof(struct devfs_fid); 225 dfhp->fid_ino = node->d_dir.d_ino; 226 dfhp->fid_gen = boottime.tv_sec; 227 } else { 228 return ENOENT; 229 } 230 231 return (0); 232 } 233 234 static int 235 devfs_vget(struct mount *mp, struct vnode *dvp, ino_t ino, struct vnode **vpp) 236 { 237 struct vnode *vp; 238 vp = devfs_inode_to_vnode(mp, ino); 239 240 if (vp == NULL) 241 return ENOENT; 242 243 *vpp = vp; 244 return 0; 245 } 246 247 248 static struct vfsops devfs_vfsops = { 249 .vfs_mount = devfs_mount, 250 .vfs_unmount = devfs_unmount, 251 .vfs_root = devfs_root, 252 .vfs_statfs = devfs_statfs, 253 .vfs_sync = vfs_stdsync, 254 .vfs_vget = devfs_vget, 255 .vfs_vptofh = devfs_vptofh, 256 .vfs_fhtovp = devfs_fhtovp 257 }; 258 259 VFS_SET(devfs_vfsops, devfs, VFCF_SYNTHETIC); 260 MODULE_VERSION(devfs, 1); 261