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 <vfs/devfs/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_mnt_data *mnt; 72 size_t size; 73 74 devfs_debug(DEVFS_DEBUG_DEBUG, "(vfsops) devfs_mount() called!\n"); 75 76 if (mp->mnt_flag & MNT_UPDATE) 77 return (EOPNOTSUPP); 78 79 80 mp->mnt_flag |= MNT_LOCAL; 81 mp->mnt_kern_flag |= MNTK_NOSTKMNT; 82 mp->mnt_data = NULL; 83 vfs_getnewfsid(mp); 84 85 size = sizeof("devfs") - 1; 86 bcopy("devfs", mp->mnt_stat.f_mntfromname, size); 87 bzero(mp->mnt_stat.f_mntfromname + size, MNAMELEN - size); 88 devfs_statfs(mp, &mp->mnt_stat, cred); 89 90 //XXX: save other mount info passed from userland or so. 91 mnt = kmalloc(sizeof(*mnt), M_DEVFS, M_WAITOK | M_ZERO); 92 93 lockmgr(&devfs_lock, LK_EXCLUSIVE); 94 mp->mnt_data = (qaddr_t)mnt; 95 mnt->jailed = jailed(cred); 96 mnt->leak_count = 0; 97 mnt->mp = mp; 98 TAILQ_INIT(&mnt->orphan_list); 99 mnt->mntonnamelen = strlen(mp->mnt_stat.f_mntonname); 100 mnt->root_node = devfs_allocp(Proot, "", NULL, mp, NULL); 101 KKASSERT(mnt->root_node); 102 lockmgr(&devfs_lock, LK_RELEASE); 103 104 vfs_add_vnodeops(mp, &devfs_vnode_norm_vops, &mp->mnt_vn_norm_ops); 105 vfs_add_vnodeops(mp, &devfs_vnode_dev_vops, &mp->mnt_vn_spec_ops); 106 107 devfs_debug(DEVFS_DEBUG_DEBUG, "calling devfs_mount_add\n"); 108 devfs_mount_add(mnt); 109 110 return (0); 111 } 112 113 /* 114 * unmount system call 115 */ 116 static int 117 devfs_unmount(struct mount *mp, int mntflags) 118 { 119 int error = 0; 120 int flags = 0; 121 122 devfs_debug(DEVFS_DEBUG_DEBUG, "(vfsops) devfs_unmount() called!\n"); 123 124 if (mntflags & MNT_FORCE) 125 flags |= FORCECLOSE; 126 127 error = vflush(mp, 0, flags); 128 129 if (error) 130 return (error); 131 devfs_tracer_orphan_count(mp, 1); 132 devfs_mount_del(DEVFS_MNTDATA(mp)); 133 kfree(mp->mnt_data, M_DEVFS); 134 mp->mnt_data = NULL; 135 136 return (0); 137 } 138 139 /* 140 * Sets *vpp to the root procfs vnode, referenced and exclusively locked 141 */ 142 int 143 devfs_root(struct mount *mp, struct vnode **vpp) 144 { 145 int ret; 146 devfs_debug(DEVFS_DEBUG_DEBUG, "(vfsops) devfs_root() called!\n"); 147 lockmgr(&devfs_lock, LK_EXCLUSIVE); 148 ret = devfs_allocv(vpp, DEVFS_MNTDATA(mp)->root_node); 149 lockmgr(&devfs_lock, LK_RELEASE); 150 return ret; 151 } 152 153 /* 154 * Get file system statistics. 155 */ 156 static int 157 devfs_statfs(struct mount *mp, struct statfs *sbp, struct ucred *cred) 158 { 159 devfs_debug(DEVFS_DEBUG_DEBUG, "(vfsops) devfs_stat() called!\n"); 160 sbp->f_bsize = DEV_BSIZE; 161 sbp->f_iosize = DEV_BSIZE; 162 sbp->f_blocks = 2; /* avoid divide by zero in some df's */ 163 sbp->f_bfree = 0; 164 sbp->f_bavail = 0; 165 sbp->f_files = 0; 166 sbp->f_ffree = 0; 167 168 if (sbp != &mp->mnt_stat) { 169 sbp->f_type = mp->mnt_vfc->vfc_typenum; 170 bcopy(&mp->mnt_stat.f_fsid, &sbp->f_fsid, sizeof(sbp->f_fsid)); 171 bcopy(mp->mnt_stat.f_mntfromname, sbp->f_mntfromname, MNAMELEN); 172 } 173 174 return (0); 175 } 176 177 static int 178 devfs_fhtovp(struct mount *mp, struct vnode *rootvp, 179 struct fid *fhp, struct vnode **vpp) 180 { 181 struct vnode *vp; 182 struct devfs_fid *dfhp; 183 184 dfhp = (struct devfs_fid *)fhp; 185 186 if (dfhp->fid_gen != boottime.tv_sec) 187 return EINVAL; 188 189 vp = devfs_inode_to_vnode(mp, dfhp->fid_ino); 190 191 if (vp) { 192 *vpp = vp; 193 } else { 194 return ENOENT; 195 } 196 197 return 0; 198 } 199 200 /* 201 * Vnode pointer to File handle 202 */ 203 /* ARGSUSED */ 204 static int 205 devfs_vptofh(struct vnode *vp, struct fid *fhp) 206 { 207 struct devfs_node *node; 208 struct devfs_fid *dfhp; 209 210 if ((node = DEVFS_NODE(vp)) != NULL) { 211 dfhp = (struct devfs_fid *)fhp; 212 dfhp->fid_len = sizeof(struct devfs_fid); 213 dfhp->fid_ino = node->d_dir.d_ino; 214 dfhp->fid_gen = boottime.tv_sec; 215 } else { 216 return ENOENT; 217 } 218 219 return (0); 220 } 221 222 static int 223 devfs_vget(struct mount *mp, struct vnode *dvp, ino_t ino, struct vnode **vpp) 224 { 225 struct vnode *vp; 226 vp = devfs_inode_to_vnode(mp, ino); 227 228 if (vp) { 229 *vpp = vp; 230 /* XXX: Maybe lock or ref? */ 231 } else { 232 return ENOENT; 233 } 234 235 return 0; 236 } 237 238 239 static struct vfsops devfs_vfsops = { 240 .vfs_mount = devfs_mount, 241 .vfs_unmount = devfs_unmount, 242 .vfs_root = devfs_root, 243 .vfs_statfs = devfs_statfs, 244 .vfs_sync = vfs_stdsync, 245 .vfs_vget = devfs_vget, 246 .vfs_vptofh = devfs_vptofh, 247 .vfs_fhtovp = devfs_fhtovp 248 }; 249 250 VFS_SET(devfs_vfsops, devfs, VFCF_SYNTHETIC); 251 MODULE_VERSION(devfs, 1); 252