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 /* 91 * XXX: save other mount info passed from userland or so. 92 */ 93 mnt = kmalloc(sizeof(*mnt), M_DEVFS, M_WAITOK | M_ZERO); 94 95 lockmgr(&devfs_lock, LK_EXCLUSIVE); 96 mp->mnt_data = (qaddr_t)mnt; 97 mnt->jailed = jailed(cred); 98 mnt->leak_count = 0; 99 mnt->mp = mp; 100 TAILQ_INIT(&mnt->orphan_list); 101 mnt->mntonnamelen = strlen(mp->mnt_stat.f_mntonname); 102 mnt->root_node = devfs_allocp(Proot, "", NULL, mp, NULL); 103 KKASSERT(mnt->root_node); 104 lockmgr(&devfs_lock, LK_RELEASE); 105 106 vfs_add_vnodeops(mp, &devfs_vnode_norm_vops, &mp->mnt_vn_norm_ops); 107 vfs_add_vnodeops(mp, &devfs_vnode_dev_vops, &mp->mnt_vn_spec_ops); 108 109 devfs_debug(DEVFS_DEBUG_DEBUG, "calling devfs_mount_add\n"); 110 devfs_mount_add(mnt); 111 112 return (0); 113 } 114 115 /* 116 * unmount system call 117 */ 118 static int 119 devfs_unmount(struct mount *mp, int mntflags) 120 { 121 int error = 0; 122 int flags = 0; 123 124 devfs_debug(DEVFS_DEBUG_DEBUG, "(vfsops) devfs_unmount() called!\n"); 125 126 if (mntflags & MNT_FORCE) 127 flags |= FORCECLOSE; 128 129 error = vflush(mp, 0, flags); 130 131 if (error) 132 return (error); 133 devfs_tracer_orphan_count(mp, 1); 134 devfs_mount_del(DEVFS_MNTDATA(mp)); 135 kfree(mp->mnt_data, M_DEVFS); 136 mp->mnt_data = NULL; 137 138 return (0); 139 } 140 141 /* 142 * Sets *vpp to the root procfs vnode, referenced and exclusively locked 143 */ 144 int 145 devfs_root(struct mount *mp, struct vnode **vpp) 146 { 147 int ret; 148 devfs_debug(DEVFS_DEBUG_DEBUG, "(vfsops) devfs_root() called!\n"); 149 lockmgr(&devfs_lock, LK_EXCLUSIVE); 150 ret = devfs_allocv(vpp, DEVFS_MNTDATA(mp)->root_node); 151 lockmgr(&devfs_lock, LK_RELEASE); 152 return ret; 153 } 154 155 /* 156 * Get file system statistics. 157 */ 158 static int 159 devfs_statfs(struct mount *mp, struct statfs *sbp, struct ucred *cred) 160 { 161 devfs_debug(DEVFS_DEBUG_DEBUG, "(vfsops) devfs_stat() called!\n"); 162 sbp->f_bsize = DEV_BSIZE; 163 sbp->f_iosize = DEV_BSIZE; 164 sbp->f_blocks = 2; /* avoid divide by zero in some df's */ 165 sbp->f_bfree = 0; 166 sbp->f_bavail = 0; 167 sbp->f_files = 0; 168 sbp->f_ffree = 0; 169 170 if (sbp != &mp->mnt_stat) { 171 sbp->f_type = mp->mnt_vfc->vfc_typenum; 172 bcopy(&mp->mnt_stat.f_fsid, &sbp->f_fsid, sizeof(sbp->f_fsid)); 173 bcopy(mp->mnt_stat.f_mntfromname, sbp->f_mntfromname, MNAMELEN); 174 } 175 176 return (0); 177 } 178 179 static int 180 devfs_fhtovp(struct mount *mp, struct vnode *rootvp, 181 struct fid *fhp, struct vnode **vpp) 182 { 183 struct vnode *vp; 184 struct devfs_fid *dfhp; 185 186 dfhp = (struct devfs_fid *)fhp; 187 188 if (dfhp->fid_gen != boottime.tv_sec) 189 return EINVAL; 190 191 vp = devfs_inode_to_vnode(mp, dfhp->fid_ino); 192 193 if (vp == NULL) 194 return ENOENT; 195 196 *vpp = vp; 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 == NULL) 229 return ENOENT; 230 231 *vpp = vp; 232 return 0; 233 } 234 235 236 static struct vfsops devfs_vfsops = { 237 .vfs_mount = devfs_mount, 238 .vfs_unmount = devfs_unmount, 239 .vfs_root = devfs_root, 240 .vfs_statfs = devfs_statfs, 241 .vfs_sync = vfs_stdsync, 242 .vfs_vget = devfs_vget, 243 .vfs_vptofh = devfs_vptofh, 244 .vfs_fhtovp = devfs_fhtovp 245 }; 246 247 VFS_SET(devfs_vfsops, devfs, VFCF_SYNTHETIC); 248 MODULE_VERSION(devfs, 1); 249