1 /* 2 * (MPSAFE) 3 * 4 * Copyright (c) 2009 The DragonFly Project. All rights reserved. 5 * 6 * This code is derived from software contributed to The DragonFly Project 7 * by Alex Hornung <ahornung@gmail.com> 8 * 9 * Redistribution and use in source and binary forms, with or without 10 * modification, are permitted provided that the following conditions 11 * are met: 12 * 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 18 * distribution. 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. 22 * 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 34 * SUCH DAMAGE. 35 */ 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> 41 #include <sys/jail.h> 42 #include <sys/lock.h> 43 #include <sys/devfs.h> 44 45 MALLOC_DECLARE(M_DEVFS); 46 47 extern struct vop_ops devfs_vnode_norm_vops; 48 extern struct vop_ops devfs_vnode_dev_vops; 49 extern struct lock devfs_lock; 50 51 static int devfs_vfs_mount (struct mount *mp, char *path, caddr_t data, 52 struct ucred *cred); 53 static int devfs_vfs_statfs (struct mount *mp, struct statfs *sbp, 54 struct ucred *cred); 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); 62 63 64 /* 65 * VFS Operations. 66 * 67 * mount system call 68 */ 69 static int 70 devfs_vfs_mount(struct mount *mp, char *path, caddr_t data, struct ucred *cred) 71 { 72 struct devfs_mount_info info; 73 struct devfs_mnt_data *mnt; 74 size_t size; 75 int error; 76 77 devfs_debug(DEVFS_DEBUG_DEBUG, "(vfsops) devfs_mount() called!\n"); 78 79 if (mp->mnt_flag & MNT_UPDATE) 80 return (EOPNOTSUPP); 81 82 if (data == NULL) { 83 bzero(&info, sizeof(info)); 84 } else { 85 if ((error = copyin(data, &info, sizeof(info))) != 0) 86 return (error); 87 } 88 89 mp->mnt_flag |= MNT_LOCAL; 90 mp->mnt_kern_flag |= MNTK_NOSTKMNT | MNTK_ALL_MPSAFE; 91 mp->mnt_data = NULL; 92 vfs_getnewfsid(mp); 93 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); 100 101 /* 102 * XXX: save other mount info passed from userland or so. 103 */ 104 mnt = kmalloc(sizeof(*mnt), M_DEVFS, M_WAITOK | M_ZERO); 105 106 lockmgr(&devfs_lock, LK_EXCLUSIVE); 107 mp->mnt_data = (qaddr_t)mnt; 108 109 if (info.flags & DEVFS_MNT_JAIL) 110 mnt->jailed = 1; 111 else 112 mnt->jailed = jailed(cred); 113 114 mnt->leak_count = 0; 115 mnt->file_count = 0; 116 mnt->mp = mp; 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); 121 122 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); 124 125 devfs_debug(DEVFS_DEBUG_DEBUG, "calling devfs_mount_add\n"); 126 devfs_mount_add(mnt); 127 128 return (0); 129 } 130 131 /* 132 * unmount system call 133 */ 134 static int 135 devfs_vfs_unmount(struct mount *mp, int mntflags) 136 { 137 int error = 0; 138 int flags = 0; 139 140 devfs_debug(DEVFS_DEBUG_DEBUG, "(vfsops) devfs_unmount() called!\n"); 141 142 if (mntflags & MNT_FORCE) 143 flags |= FORCECLOSE; 144 145 error = vflush(mp, 0, flags); 146 147 if (error) 148 return (error); 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); 154 mp->mnt_data = NULL; 155 156 return (0); 157 } 158 159 /* 160 * Sets *vpp to the root procfs vnode, referenced and exclusively locked 161 */ 162 int 163 devfs_vfs_root(struct mount *mp, struct vnode **vpp) 164 { 165 int ret; 166 167 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); 171 172 return ret; 173 } 174 175 /* 176 * Get file system statistics. 177 */ 178 static int 179 devfs_vfs_statfs(struct mount *mp, struct statfs *sbp, struct ucred *cred) 180 { 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 */ 185 sbp->f_bfree = 0; 186 sbp->f_bavail = 0; 187 sbp->f_files = (DEVFS_MNTDATA(mp))?(DEVFS_MNTDATA(mp)->file_count):0; 188 sbp->f_ffree = 0; 189 190 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); 194 } 195 196 return (0); 197 } 198 199 static int 200 devfs_vfs_fhtovp(struct mount *mp, struct vnode *rootvp, 201 struct fid *fhp, struct vnode **vpp) 202 { 203 struct vnode *vp; 204 struct devfs_fid *dfhp; 205 206 dfhp = (struct devfs_fid *)fhp; 207 208 if (dfhp->fid_gen != boottime.tv_sec) 209 return EINVAL; 210 211 vp = devfs_inode_to_vnode(mp, dfhp->fid_ino); 212 213 if (vp == NULL) 214 return ENOENT; 215 216 *vpp = vp; 217 return 0; 218 } 219 220 /* 221 * Vnode pointer to File handle 222 */ 223 static int 224 devfs_vfs_vptofh(struct vnode *vp, struct fid *fhp) 225 { 226 struct devfs_node *node; 227 struct devfs_fid *dfhp; 228 229 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; 234 } else { 235 return ENOENT; 236 } 237 238 return (0); 239 } 240 241 static int 242 devfs_vfs_vget(struct mount *mp, struct vnode *dvp, 243 ino_t ino, struct vnode **vpp) 244 { 245 struct vnode *vp; 246 vp = devfs_inode_to_vnode(mp, ino); 247 248 if (vp == NULL) 249 return ENOENT; 250 251 *vpp = vp; 252 return 0; 253 } 254 255 256 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 265 }; 266 267 VFS_SET(devfs_vfsops, devfs, VFCF_SYNTHETIC); 268 MODULE_VERSION(devfs, 1); 269