| 1 | /* $NetBSD: ulfs_vfsops.c,v 1.12 2016/06/20 02:25:03 dholland Exp $ */ |
| 2 | /* from NetBSD: ufs_vfsops.c,v 1.54 2015/03/17 09:39:29 hannken Exp */ |
| 3 | |
| 4 | /* |
| 5 | * Copyright (c) 1991, 1993, 1994 |
| 6 | * The Regents of the University of California. All rights reserved. |
| 7 | * (c) UNIX System Laboratories, Inc. |
| 8 | * All or some portions of this file are derived from material licensed |
| 9 | * to the University of California by American Telephone and Telegraph |
| 10 | * Co. or Unix System Laboratories, Inc. and are reproduced herein with |
| 11 | * the permission of UNIX System Laboratories, Inc. |
| 12 | * |
| 13 | * Redistribution and use in source and binary forms, with or without |
| 14 | * modification, are permitted provided that the following conditions |
| 15 | * are met: |
| 16 | * 1. Redistributions of source code must retain the above copyright |
| 17 | * notice, this list of conditions and the following disclaimer. |
| 18 | * 2. Redistributions in binary form must reproduce the above copyright |
| 19 | * notice, this list of conditions and the following disclaimer in the |
| 20 | * documentation and/or other materials provided with the distribution. |
| 21 | * 3. Neither the name of the University nor the names of its contributors |
| 22 | * may be used to endorse or promote products derived from this software |
| 23 | * without specific prior written permission. |
| 24 | * |
| 25 | * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND |
| 26 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
| 27 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
| 28 | * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE |
| 29 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
| 30 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
| 31 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
| 32 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
| 33 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
| 34 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
| 35 | * SUCH DAMAGE. |
| 36 | * |
| 37 | * @(#)ufs_vfsops.c 8.8 (Berkeley) 5/20/95 |
| 38 | */ |
| 39 | |
| 40 | #include <sys/cdefs.h> |
| 41 | __KERNEL_RCSID(0, "$NetBSD: ulfs_vfsops.c,v 1.12 2016/06/20 02:25:03 dholland Exp $" ); |
| 42 | |
| 43 | #if defined(_KERNEL_OPT) |
| 44 | #include "opt_lfs.h" |
| 45 | #include "opt_quota.h" |
| 46 | #endif |
| 47 | |
| 48 | #include <sys/param.h> |
| 49 | #include <sys/mbuf.h> |
| 50 | #include <sys/mount.h> |
| 51 | #include <sys/proc.h> |
| 52 | #include <sys/buf.h> |
| 53 | #include <sys/vnode.h> |
| 54 | #include <sys/kmem.h> |
| 55 | #include <sys/kauth.h> |
| 56 | #include <sys/quotactl.h> |
| 57 | |
| 58 | #include <miscfs/specfs/specdev.h> |
| 59 | |
| 60 | #include <ufs/lfs/lfs.h> |
| 61 | #include <ufs/lfs/lfs_accessors.h> |
| 62 | #include <ufs/lfs/ulfs_quotacommon.h> |
| 63 | #include <ufs/lfs/ulfs_inode.h> |
| 64 | #include <ufs/lfs/ulfsmount.h> |
| 65 | #include <ufs/lfs/ulfs_extern.h> |
| 66 | #ifdef LFS_DIRHASH |
| 67 | #include <ufs/lfs/ulfs_dirhash.h> |
| 68 | #endif |
| 69 | |
| 70 | /* how many times ulfs_init() was called */ |
| 71 | static int ulfs_initcount = 0; |
| 72 | |
| 73 | /* |
| 74 | * Make a filesystem operational. |
| 75 | * Nothing to do at the moment. |
| 76 | */ |
| 77 | /* ARGSUSED */ |
| 78 | int |
| 79 | ulfs_start(struct mount *mp, int flags) |
| 80 | { |
| 81 | |
| 82 | return (0); |
| 83 | } |
| 84 | |
| 85 | /* |
| 86 | * Return the root of a filesystem. |
| 87 | */ |
| 88 | int |
| 89 | ulfs_root(struct mount *mp, struct vnode **vpp) |
| 90 | { |
| 91 | struct vnode *nvp; |
| 92 | int error; |
| 93 | |
| 94 | if ((error = VFS_VGET(mp, (ino_t)ULFS_ROOTINO, &nvp)) != 0) |
| 95 | return (error); |
| 96 | *vpp = nvp; |
| 97 | return (0); |
| 98 | } |
| 99 | |
| 100 | /* |
| 101 | * Do operations associated with quotas |
| 102 | */ |
| 103 | int |
| 104 | ulfs_quotactl(struct mount *mp, struct quotactl_args *args) |
| 105 | { |
| 106 | |
| 107 | #if !defined(LFS_QUOTA) && !defined(LFS_QUOTA2) |
| 108 | (void) mp; |
| 109 | (void) args; |
| 110 | return (EOPNOTSUPP); |
| 111 | #else |
| 112 | struct lwp *l = curlwp; |
| 113 | int error; |
| 114 | |
| 115 | /* Mark the mount busy, as we're passing it to kauth(9). */ |
| 116 | error = vfs_busy(mp, NULL); |
| 117 | if (error) { |
| 118 | return (error); |
| 119 | } |
| 120 | mutex_enter(&mp->mnt_updating); |
| 121 | |
| 122 | error = lfsquota_handle_cmd(mp, l, args); |
| 123 | |
| 124 | mutex_exit(&mp->mnt_updating); |
| 125 | vfs_unbusy(mp, false, NULL); |
| 126 | return (error); |
| 127 | #endif |
| 128 | } |
| 129 | |
| 130 | #if 0 |
| 131 | switch (cmd) { |
| 132 | case Q_SYNC: |
| 133 | break; |
| 134 | |
| 135 | case Q_GETQUOTA: |
| 136 | /* The user can always query about his own quota. */ |
| 137 | if (uid == kauth_cred_getuid(l->l_cred)) |
| 138 | break; |
| 139 | |
| 140 | error = kauth_authorize_system(l->l_cred, KAUTH_SYSTEM_FS_QUOTA, |
| 141 | KAUTH_REQ_SYSTEM_FS_QUOTA_GET, mp, KAUTH_ARG(uid), NULL); |
| 142 | |
| 143 | break; |
| 144 | |
| 145 | case Q_QUOTAON: |
| 146 | case Q_QUOTAOFF: |
| 147 | error = kauth_authorize_system(l->l_cred, KAUTH_SYSTEM_FS_QUOTA, |
| 148 | KAUTH_REQ_SYSTEM_FS_QUOTA_ONOFF, mp, NULL, NULL); |
| 149 | |
| 150 | break; |
| 151 | |
| 152 | case Q_SETQUOTA: |
| 153 | case Q_SETUSE: |
| 154 | error = kauth_authorize_system(l->l_cred, KAUTH_SYSTEM_FS_QUOTA, |
| 155 | KAUTH_REQ_SYSTEM_FS_QUOTA_MANAGE, mp, KAUTH_ARG(uid), NULL); |
| 156 | |
| 157 | break; |
| 158 | |
| 159 | default: |
| 160 | error = EINVAL; |
| 161 | break; |
| 162 | } |
| 163 | |
| 164 | type = cmds & SUBCMDMASK; |
| 165 | if (!error) { |
| 166 | /* Only check if there was no error above. */ |
| 167 | if ((u_int)type >= MAXQUOTAS) |
| 168 | error = EINVAL; |
| 169 | } |
| 170 | |
| 171 | if (error) { |
| 172 | vfs_unbusy(mp, false, NULL); |
| 173 | return (error); |
| 174 | } |
| 175 | |
| 176 | mutex_enter(&mp->mnt_updating); |
| 177 | switch (cmd) { |
| 178 | |
| 179 | case Q_QUOTAON: |
| 180 | error = quotaon(l, mp, type, arg); |
| 181 | break; |
| 182 | |
| 183 | case Q_QUOTAOFF: |
| 184 | error = quotaoff(l, mp, type); |
| 185 | break; |
| 186 | |
| 187 | case Q_SETQUOTA: |
| 188 | error = setquota(mp, uid, type, arg); |
| 189 | break; |
| 190 | |
| 191 | case Q_SETUSE: |
| 192 | error = setuse(mp, uid, type, arg); |
| 193 | break; |
| 194 | |
| 195 | case Q_GETQUOTA: |
| 196 | error = getquota(mp, uid, type, arg); |
| 197 | break; |
| 198 | |
| 199 | case Q_SYNC: |
| 200 | error = lfs_qsync(mp); |
| 201 | break; |
| 202 | |
| 203 | default: |
| 204 | error = EINVAL; |
| 205 | } |
| 206 | mutex_exit(&mp->mnt_updating); |
| 207 | vfs_unbusy(mp, false, NULL); |
| 208 | return (error); |
| 209 | #endif |
| 210 | |
| 211 | /* |
| 212 | * This is the generic part of fhtovp called after the underlying |
| 213 | * filesystem has validated the file handle. |
| 214 | */ |
| 215 | int |
| 216 | ulfs_fhtovp(struct mount *mp, struct ulfs_ufid *ufhp, struct vnode **vpp) |
| 217 | { |
| 218 | struct vnode *nvp; |
| 219 | struct inode *ip; |
| 220 | int error; |
| 221 | |
| 222 | if ((error = VFS_VGET(mp, ufhp->ufid_ino, &nvp)) != 0) { |
| 223 | if (error == ENOENT) |
| 224 | error = ESTALE; |
| 225 | *vpp = NULLVP; |
| 226 | return (error); |
| 227 | } |
| 228 | ip = VTOI(nvp); |
| 229 | KASSERT(ip != NULL); |
| 230 | if (ip->i_mode == 0 || ip->i_gen != ufhp->ufid_gen) { |
| 231 | vput(nvp); |
| 232 | *vpp = NULLVP; |
| 233 | return (ESTALE); |
| 234 | } |
| 235 | *vpp = nvp; |
| 236 | return (0); |
| 237 | } |
| 238 | |
| 239 | /* |
| 240 | * Initialize ULFS filesystems, done only once. |
| 241 | */ |
| 242 | void |
| 243 | ulfs_init(void) |
| 244 | { |
| 245 | if (ulfs_initcount++ > 0) |
| 246 | return; |
| 247 | |
| 248 | #if defined(LFS_QUOTA) || defined(LFS_QUOTA2) |
| 249 | lfs_dqinit(); |
| 250 | #endif |
| 251 | #ifdef LFS_DIRHASH |
| 252 | ulfsdirhash_init(); |
| 253 | #endif |
| 254 | #ifdef LFS_EXTATTR |
| 255 | ulfs_extattr_init(); |
| 256 | #endif |
| 257 | } |
| 258 | |
| 259 | void |
| 260 | ulfs_reinit(void) |
| 261 | { |
| 262 | |
| 263 | #if defined(LFS_QUOTA) || defined(LFS_QUOTA2) |
| 264 | lfs_dqreinit(); |
| 265 | #endif |
| 266 | } |
| 267 | |
| 268 | /* |
| 269 | * Free ULFS filesystem resources, done only once. |
| 270 | */ |
| 271 | void |
| 272 | ulfs_done(void) |
| 273 | { |
| 274 | if (--ulfs_initcount > 0) |
| 275 | return; |
| 276 | |
| 277 | #if defined(LFS_QUOTA) || defined(LFS_QUOTA2) |
| 278 | lfs_dqdone(); |
| 279 | #endif |
| 280 | #ifdef LFS_DIRHASH |
| 281 | ulfsdirhash_done(); |
| 282 | #endif |
| 283 | #ifdef LFS_EXTATTR |
| 284 | ulfs_extattr_done(); |
| 285 | #endif |
| 286 | } |
| 287 | |