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