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/namecache.h> 41 #include <sys/vnode.h> 42 #include <sys/jail.h> 43 #include <sys/lock.h> 44 #include <sys/devfs.h> 45 46 MALLOC_DECLARE(M_DEVFS); 47 48 extern struct vop_ops devfs_vnode_norm_vops; 49 extern struct vop_ops devfs_vnode_dev_vops; 50 extern struct lock devfs_lock; 51 52 static int devfs_vfs_mount (struct mount *mp, char *path, caddr_t data, 53 struct ucred *cred); 54 static int devfs_vfs_statfs (struct mount *mp, struct statfs *sbp, 55 struct ucred *cred); 56 static int devfs_vfs_unmount (struct mount *mp, int mntflags); 57 int devfs_vfs_root(struct mount *mp, struct vnode **vpp); 58 static int devfs_vfs_vget(struct mount *mp, struct vnode *dvp, 59 ino_t ino, struct vnode **vpp); 60 static int devfs_vfs_fhtovp(struct mount *mp, struct vnode *rootvp, 61 struct fid *fhp, struct vnode **vpp); 62 static int devfs_vfs_vptofh(struct vnode *vp, struct fid *fhp); 63 64 65 /* 66 * VFS Operations. 67 * 68 * mount system call 69 */ 70 static int 71 devfs_vfs_mount(struct mount *mp, char *path, caddr_t data, struct ucred *cred) 72 { 73 struct devfs_mount_info info; 74 struct devfs_mnt_data *mnt; 75 size_t size; 76 int error; 77 78 devfs_debug(DEVFS_DEBUG_DEBUG, "(vfsops) devfs_mount() called!\n"); 79 80 if (mp->mnt_flag & MNT_UPDATE) 81 return (EOPNOTSUPP); 82 83 if (data == NULL) { 84 bzero(&info, sizeof(info)); 85 } else { 86 if ((error = copyin(data, &info, sizeof(info))) != 0) 87 return (error); 88 } 89 90 mp->mnt_flag |= MNT_LOCAL; 91 mp->mnt_kern_flag |= MNTK_NOSTKMNT | MNTK_ALL_MPSAFE; 92 mp->mnt_kern_flag |= MNTK_QUICKHALT; /* no teardown needed on halt */ 93 mp->mnt_data = NULL; 94 vfs_getnewfsid(mp); 95 96 size = sizeof("devfs") - 1; 97 bcopy("devfs", mp->mnt_stat.f_mntfromname, size); 98 bzero(mp->mnt_stat.f_mntfromname + size, MNAMELEN - size); 99 copyinstr(path, mp->mnt_stat.f_mntonname, 100 sizeof(mp->mnt_stat.f_mntonname) -1, &size); 101 devfs_vfs_statfs(mp, &mp->mnt_stat, cred); 102 103 /* 104 * XXX: save other mount info passed from userland or so. 105 */ 106 mnt = kmalloc(sizeof(*mnt), M_DEVFS, M_WAITOK | M_ZERO); 107 108 lockmgr(&devfs_lock, LK_EXCLUSIVE); 109 mp->mnt_data = (qaddr_t)mnt; 110 111 if (info.flags & DEVFS_MNT_JAIL) 112 mnt->jailed = 1; 113 else 114 mnt->jailed = jailed(cred); 115 116 mnt->leak_count = 0; 117 mnt->file_count = 0; 118 mnt->mp = mp; 119 TAILQ_INIT(&mnt->orphan_list); 120 mnt->root_node = devfs_allocp(Nroot, "", NULL, mp, NULL); 121 KKASSERT(mnt->root_node); 122 lockmgr(&devfs_lock, LK_RELEASE); 123 124 vfs_add_vnodeops(mp, &devfs_vnode_norm_vops, &mp->mnt_vn_norm_ops); 125 vfs_add_vnodeops(mp, &devfs_vnode_dev_vops, &mp->mnt_vn_spec_ops); 126 127 devfs_debug(DEVFS_DEBUG_DEBUG, "calling devfs_mount_add\n"); 128 devfs_mount_add(mnt); 129 130 return (0); 131 } 132 133 /* 134 * unmount system call 135 */ 136 static int 137 devfs_vfs_unmount(struct mount *mp, int mntflags) 138 { 139 int error = 0; 140 int flags = 0; 141 142 devfs_debug(DEVFS_DEBUG_DEBUG, "(vfsops) devfs_unmount() called!\n"); 143 144 if (mntflags & MNT_FORCE) 145 flags |= FORCECLOSE; 146 147 error = vflush(mp, 0, flags); 148 149 if (error) 150 return (error); 151 lockmgr(&devfs_lock, LK_EXCLUSIVE); 152 devfs_tracer_orphan_count(mp, 1); 153 lockmgr(&devfs_lock, LK_RELEASE); 154 devfs_mount_del(DEVFS_MNTDATA(mp)); 155 kfree(mp->mnt_data, M_DEVFS); 156 mp->mnt_data = NULL; 157 158 return (0); 159 } 160 161 /* 162 * Sets *vpp to the root procfs vnode, referenced and exclusively locked 163 */ 164 int 165 devfs_vfs_root(struct mount *mp, struct vnode **vpp) 166 { 167 int ret; 168 169 devfs_debug(DEVFS_DEBUG_DEBUG, "(vfsops) devfs_root() called!\n"); 170 lockmgr(&devfs_lock, LK_EXCLUSIVE); 171 ret = devfs_allocv(vpp, DEVFS_MNTDATA(mp)->root_node); 172 lockmgr(&devfs_lock, LK_RELEASE); 173 174 return ret; 175 } 176 177 /* 178 * Get file system statistics. 179 */ 180 static int 181 devfs_vfs_statfs(struct mount *mp, struct statfs *sbp, struct ucred *cred) 182 { 183 devfs_debug(DEVFS_DEBUG_DEBUG, "(vfsops) devfs_stat() called!\n"); 184 sbp->f_bsize = DEV_BSIZE; 185 sbp->f_iosize = DEV_BSIZE; 186 sbp->f_blocks = 2; /* avoid divide by zero in some df's */ 187 sbp->f_bfree = 0; 188 sbp->f_bavail = 0; 189 sbp->f_files = (DEVFS_MNTDATA(mp))?(DEVFS_MNTDATA(mp)->file_count):0; 190 sbp->f_ffree = 0; 191 192 if (sbp != &mp->mnt_stat) { 193 sbp->f_type = mp->mnt_vfc->vfc_typenum; 194 bcopy(&mp->mnt_stat.f_fsid, &sbp->f_fsid, sizeof(sbp->f_fsid)); 195 bcopy(mp->mnt_stat.f_mntfromname, sbp->f_mntfromname, MNAMELEN); 196 } 197 198 return (0); 199 } 200 201 static int 202 devfs_vfs_fhtovp(struct mount *mp, struct vnode *rootvp, 203 struct fid *fhp, struct vnode **vpp) 204 { 205 struct vnode *vp; 206 struct devfs_fid *dfhp; 207 208 dfhp = (struct devfs_fid *)fhp; 209 210 if (dfhp->fid_gen != boottime.tv_sec) 211 return EINVAL; 212 213 vp = devfs_inode_to_vnode(mp, dfhp->fid_ino); 214 215 if (vp == NULL) 216 return ENOENT; 217 218 *vpp = vp; 219 return 0; 220 } 221 222 /* 223 * Vnode pointer to File handle 224 */ 225 static int 226 devfs_vfs_vptofh(struct vnode *vp, struct fid *fhp) 227 { 228 struct devfs_node *node; 229 struct devfs_fid *dfhp; 230 231 if ((node = DEVFS_NODE(vp)) != NULL) { 232 dfhp = (struct devfs_fid *)fhp; 233 dfhp->fid_len = sizeof(struct devfs_fid); 234 dfhp->fid_ino = node->d_dir.d_ino; 235 dfhp->fid_gen = boottime.tv_sec; 236 } else { 237 return ENOENT; 238 } 239 240 return (0); 241 } 242 243 static int 244 devfs_vfs_vget(struct mount *mp, struct vnode *dvp, 245 ino_t ino, struct vnode **vpp) 246 { 247 struct vnode *vp; 248 vp = devfs_inode_to_vnode(mp, ino); 249 250 if (vp == NULL) 251 return ENOENT; 252 253 *vpp = vp; 254 return 0; 255 } 256 257 static void 258 devfs_vfs_ncpgen_set(struct mount *mp, struct namecache *ncp) 259 { 260 ncp->nc_namecache_gen = mp->mnt_namecache_gen; 261 } 262 263 static int 264 devfs_vfs_ncpgen_test(struct mount *mp, struct namecache *ncp) 265 { 266 return (ncp->nc_namecache_gen != mp->mnt_namecache_gen); 267 } 268 269 static struct vfsops devfs_vfsops = { 270 .vfs_mount = devfs_vfs_mount, 271 .vfs_unmount = devfs_vfs_unmount, 272 .vfs_root = devfs_vfs_root, 273 .vfs_statfs = devfs_vfs_statfs, 274 .vfs_vget = devfs_vfs_vget, 275 .vfs_vptofh = devfs_vfs_vptofh, 276 .vfs_fhtovp = devfs_vfs_fhtovp, 277 .vfs_ncpgen_set = devfs_vfs_ncpgen_set, 278 .vfs_ncpgen_test = devfs_vfs_ncpgen_test 279 }; 280 281 VFS_SET(devfs_vfsops, devfs, VFCF_SYNTHETIC | VFCF_MPSAFE); 282 MODULE_VERSION(devfs, 1); 283