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_data = NULL; 93 vfs_getnewfsid(mp); 94 95 size = sizeof("devfs") - 1; 96 bcopy("devfs", mp->mnt_stat.f_mntfromname, size); 97 bzero(mp->mnt_stat.f_mntfromname + size, MNAMELEN - size); 98 copyinstr(path, mp->mnt_stat.f_mntonname, 99 sizeof(mp->mnt_stat.f_mntonname) -1, &size); 100 devfs_vfs_statfs(mp, &mp->mnt_stat, cred); 101 102 /* 103 * XXX: save other mount info passed from userland or so. 104 */ 105 mnt = kmalloc(sizeof(*mnt), M_DEVFS, M_WAITOK | M_ZERO); 106 107 lockmgr(&devfs_lock, LK_EXCLUSIVE); 108 mp->mnt_data = (qaddr_t)mnt; 109 110 if (info.flags & DEVFS_MNT_JAIL) 111 mnt->jailed = 1; 112 else 113 mnt->jailed = jailed(cred); 114 115 mnt->leak_count = 0; 116 mnt->file_count = 0; 117 mnt->mp = mp; 118 TAILQ_INIT(&mnt->orphan_list); 119 mnt->root_node = devfs_allocp(Nroot, "", NULL, mp, NULL); 120 KKASSERT(mnt->root_node); 121 lockmgr(&devfs_lock, LK_RELEASE); 122 123 vfs_add_vnodeops(mp, &devfs_vnode_norm_vops, &mp->mnt_vn_norm_ops); 124 vfs_add_vnodeops(mp, &devfs_vnode_dev_vops, &mp->mnt_vn_spec_ops); 125 126 devfs_debug(DEVFS_DEBUG_DEBUG, "calling devfs_mount_add\n"); 127 devfs_mount_add(mnt); 128 129 return (0); 130 } 131 132 /* 133 * unmount system call 134 */ 135 static int 136 devfs_vfs_unmount(struct mount *mp, int mntflags) 137 { 138 int error = 0; 139 int flags = 0; 140 141 devfs_debug(DEVFS_DEBUG_DEBUG, "(vfsops) devfs_unmount() called!\n"); 142 143 if (mntflags & MNT_FORCE) 144 flags |= FORCECLOSE; 145 146 error = vflush(mp, 0, flags); 147 148 if (error) 149 return (error); 150 lockmgr(&devfs_lock, LK_EXCLUSIVE); 151 devfs_tracer_orphan_count(mp, 1); 152 lockmgr(&devfs_lock, LK_RELEASE); 153 devfs_mount_del(DEVFS_MNTDATA(mp)); 154 kfree(mp->mnt_data, M_DEVFS); 155 mp->mnt_data = NULL; 156 157 return (0); 158 } 159 160 /* 161 * Sets *vpp to the root procfs vnode, referenced and exclusively locked 162 */ 163 int 164 devfs_vfs_root(struct mount *mp, struct vnode **vpp) 165 { 166 int ret; 167 168 devfs_debug(DEVFS_DEBUG_DEBUG, "(vfsops) devfs_root() called!\n"); 169 lockmgr(&devfs_lock, LK_EXCLUSIVE); 170 ret = devfs_allocv(vpp, DEVFS_MNTDATA(mp)->root_node); 171 lockmgr(&devfs_lock, LK_RELEASE); 172 173 return ret; 174 } 175 176 /* 177 * Get file system statistics. 178 */ 179 static int 180 devfs_vfs_statfs(struct mount *mp, struct statfs *sbp, struct ucred *cred) 181 { 182 devfs_debug(DEVFS_DEBUG_DEBUG, "(vfsops) devfs_stat() called!\n"); 183 sbp->f_bsize = DEV_BSIZE; 184 sbp->f_iosize = DEV_BSIZE; 185 sbp->f_blocks = 2; /* avoid divide by zero in some df's */ 186 sbp->f_bfree = 0; 187 sbp->f_bavail = 0; 188 sbp->f_files = (DEVFS_MNTDATA(mp))?(DEVFS_MNTDATA(mp)->file_count):0; 189 sbp->f_ffree = 0; 190 191 if (sbp != &mp->mnt_stat) { 192 sbp->f_type = mp->mnt_vfc->vfc_typenum; 193 bcopy(&mp->mnt_stat.f_fsid, &sbp->f_fsid, sizeof(sbp->f_fsid)); 194 bcopy(mp->mnt_stat.f_mntfromname, sbp->f_mntfromname, MNAMELEN); 195 } 196 197 return (0); 198 } 199 200 static int 201 devfs_vfs_fhtovp(struct mount *mp, struct vnode *rootvp, 202 struct fid *fhp, struct vnode **vpp) 203 { 204 struct vnode *vp; 205 struct devfs_fid *dfhp; 206 207 dfhp = (struct devfs_fid *)fhp; 208 209 if (dfhp->fid_gen != boottime.tv_sec) 210 return EINVAL; 211 212 vp = devfs_inode_to_vnode(mp, dfhp->fid_ino); 213 214 if (vp == NULL) 215 return ENOENT; 216 217 *vpp = vp; 218 return 0; 219 } 220 221 /* 222 * Vnode pointer to File handle 223 */ 224 static int 225 devfs_vfs_vptofh(struct vnode *vp, struct fid *fhp) 226 { 227 struct devfs_node *node; 228 struct devfs_fid *dfhp; 229 230 if ((node = DEVFS_NODE(vp)) != NULL) { 231 dfhp = (struct devfs_fid *)fhp; 232 dfhp->fid_len = sizeof(struct devfs_fid); 233 dfhp->fid_ino = node->d_dir.d_ino; 234 dfhp->fid_gen = boottime.tv_sec; 235 } else { 236 return ENOENT; 237 } 238 239 return (0); 240 } 241 242 static int 243 devfs_vfs_vget(struct mount *mp, struct vnode *dvp, 244 ino_t ino, struct vnode **vpp) 245 { 246 struct vnode *vp; 247 vp = devfs_inode_to_vnode(mp, ino); 248 249 if (vp == NULL) 250 return ENOENT; 251 252 *vpp = vp; 253 return 0; 254 } 255 256 static void 257 devfs_vfs_ncpgen_set(struct mount *mp, struct namecache *ncp) 258 { 259 ncp->nc_namecache_gen = mp->mnt_namecache_gen; 260 } 261 262 static int 263 devfs_vfs_ncpgen_test(struct mount *mp, struct namecache *ncp) 264 { 265 return (ncp->nc_namecache_gen != mp->mnt_namecache_gen); 266 } 267 268 static struct vfsops devfs_vfsops = { 269 .vfs_mount = devfs_vfs_mount, 270 .vfs_unmount = devfs_vfs_unmount, 271 .vfs_root = devfs_vfs_root, 272 .vfs_statfs = devfs_vfs_statfs, 273 .vfs_vget = devfs_vfs_vget, 274 .vfs_vptofh = devfs_vfs_vptofh, 275 .vfs_fhtovp = devfs_vfs_fhtovp, 276 .vfs_ncpgen_set = devfs_vfs_ncpgen_set, 277 .vfs_ncpgen_test = devfs_vfs_ncpgen_test 278 }; 279 280 VFS_SET(devfs_vfsops, devfs, VFCF_SYNTHETIC | VFCF_MPSAFE); 281 MODULE_VERSION(devfs, 1); 282