| 1 | /* $NetBSD: mfs_vnops.c,v 1.56 2015/01/14 11:21:31 hannken Exp $ */ |
| 2 | |
| 3 | /* |
| 4 | * Copyright (c) 1989, 1993 |
| 5 | * The Regents of the University of California. All rights reserved. |
| 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 | * 1. Redistributions of source code must retain the above copyright |
| 11 | * notice, this list of conditions and the following disclaimer. |
| 12 | * 2. Redistributions in binary form must reproduce the above copyright |
| 13 | * notice, this list of conditions and the following disclaimer in the |
| 14 | * documentation and/or other materials provided with the distribution. |
| 15 | * 3. Neither the name of the University nor the names of its contributors |
| 16 | * may be used to endorse or promote products derived from this software |
| 17 | * without specific prior written permission. |
| 18 | * |
| 19 | * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND |
| 20 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
| 21 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
| 22 | * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE |
| 23 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
| 24 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
| 25 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
| 26 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
| 27 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
| 28 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
| 29 | * SUCH DAMAGE. |
| 30 | * |
| 31 | * @(#)mfs_vnops.c 8.11 (Berkeley) 5/22/95 |
| 32 | */ |
| 33 | |
| 34 | #include <sys/cdefs.h> |
| 35 | __KERNEL_RCSID(0, "$NetBSD: mfs_vnops.c,v 1.56 2015/01/14 11:21:31 hannken Exp $" ); |
| 36 | |
| 37 | #include <sys/param.h> |
| 38 | #include <sys/systm.h> |
| 39 | #include <sys/time.h> |
| 40 | #include <sys/kernel.h> |
| 41 | #include <sys/proc.h> |
| 42 | #include <sys/buf.h> |
| 43 | #include <sys/bufq.h> |
| 44 | #include <sys/vnode.h> |
| 45 | #include <sys/kmem.h> |
| 46 | |
| 47 | #include <miscfs/genfs/genfs.h> |
| 48 | #include <miscfs/specfs/specdev.h> |
| 49 | |
| 50 | #include <machine/vmparam.h> |
| 51 | |
| 52 | #include <ufs/mfs/mfsnode.h> |
| 53 | #include <ufs/mfs/mfs_extern.h> |
| 54 | |
| 55 | /* |
| 56 | * mfs vnode operations. |
| 57 | */ |
| 58 | int (**mfs_vnodeop_p)(void *); |
| 59 | const struct vnodeopv_entry_desc mfs_vnodeop_entries[] = { |
| 60 | { &vop_default_desc, vn_default_error }, |
| 61 | { &vop_lookup_desc, mfs_lookup }, /* lookup */ |
| 62 | { &vop_create_desc, mfs_create }, /* create */ |
| 63 | { &vop_mknod_desc, mfs_mknod }, /* mknod */ |
| 64 | { &vop_open_desc, mfs_open }, /* open */ |
| 65 | { &vop_close_desc, mfs_close }, /* close */ |
| 66 | { &vop_access_desc, mfs_access }, /* access */ |
| 67 | { &vop_getattr_desc, mfs_getattr }, /* getattr */ |
| 68 | { &vop_setattr_desc, mfs_setattr }, /* setattr */ |
| 69 | { &vop_read_desc, mfs_read }, /* read */ |
| 70 | { &vop_write_desc, mfs_write }, /* write */ |
| 71 | { &vop_fallocate_desc, genfs_eopnotsupp }, /* fallocate */ |
| 72 | { &vop_fdiscard_desc, genfs_eopnotsupp }, /* fdiscard */ |
| 73 | { &vop_ioctl_desc, mfs_ioctl }, /* ioctl */ |
| 74 | { &vop_poll_desc, mfs_poll }, /* poll */ |
| 75 | { &vop_revoke_desc, mfs_revoke }, /* revoke */ |
| 76 | { &vop_mmap_desc, mfs_mmap }, /* mmap */ |
| 77 | { &vop_fsync_desc, spec_fsync }, /* fsync */ |
| 78 | { &vop_seek_desc, mfs_seek }, /* seek */ |
| 79 | { &vop_remove_desc, mfs_remove }, /* remove */ |
| 80 | { &vop_link_desc, mfs_link }, /* link */ |
| 81 | { &vop_rename_desc, mfs_rename }, /* rename */ |
| 82 | { &vop_mkdir_desc, mfs_mkdir }, /* mkdir */ |
| 83 | { &vop_rmdir_desc, mfs_rmdir }, /* rmdir */ |
| 84 | { &vop_symlink_desc, mfs_symlink }, /* symlink */ |
| 85 | { &vop_readdir_desc, mfs_readdir }, /* readdir */ |
| 86 | { &vop_readlink_desc, mfs_readlink }, /* readlink */ |
| 87 | { &vop_abortop_desc, mfs_abortop }, /* abortop */ |
| 88 | { &vop_inactive_desc, mfs_inactive }, /* inactive */ |
| 89 | { &vop_reclaim_desc, mfs_reclaim }, /* reclaim */ |
| 90 | { &vop_lock_desc, genfs_nolock }, /* lock */ |
| 91 | { &vop_unlock_desc, genfs_nounlock }, /* unlock */ |
| 92 | { &vop_bmap_desc, mfs_bmap }, /* bmap */ |
| 93 | { &vop_strategy_desc, mfs_strategy }, /* strategy */ |
| 94 | { &vop_print_desc, mfs_print }, /* print */ |
| 95 | { &vop_islocked_desc, mfs_islocked }, /* islocked */ |
| 96 | { &vop_pathconf_desc, mfs_pathconf }, /* pathconf */ |
| 97 | { &vop_advlock_desc, mfs_advlock }, /* advlock */ |
| 98 | { &vop_bwrite_desc, mfs_bwrite }, /* bwrite */ |
| 99 | { &vop_putpages_desc, mfs_putpages }, /* putpages */ |
| 100 | { NULL, NULL } |
| 101 | }; |
| 102 | const struct vnodeopv_desc mfs_vnodeop_opv_desc = |
| 103 | { &mfs_vnodeop_p, mfs_vnodeop_entries }; |
| 104 | |
| 105 | /* |
| 106 | * Vnode Operations. |
| 107 | * |
| 108 | * Open called to allow memory filesystem to initialize and |
| 109 | * validate before actual IO. Record our process identifier |
| 110 | * so we can tell when we are doing I/O to ourself. |
| 111 | */ |
| 112 | /* ARGSUSED */ |
| 113 | int |
| 114 | mfs_open(void *v) |
| 115 | { |
| 116 | struct vop_open_args /* { |
| 117 | struct vnode *a_vp; |
| 118 | int a_mode; |
| 119 | kauth_cred_t a_cred; |
| 120 | } */ *ap = v; |
| 121 | |
| 122 | if (ap->a_vp->v_type != VBLK) { |
| 123 | panic("mfs_ioctl not VBLK" ); |
| 124 | /* NOTREACHED */ |
| 125 | } |
| 126 | return (0); |
| 127 | } |
| 128 | |
| 129 | /* |
| 130 | * Pass I/O requests to the memory filesystem process. |
| 131 | */ |
| 132 | int |
| 133 | mfs_strategy(void *v) |
| 134 | { |
| 135 | struct vop_strategy_args /* { |
| 136 | struct vnode *a_vp; |
| 137 | struct buf *a_bp; |
| 138 | } */ *ap = v; |
| 139 | struct vnode *vp = ap->a_vp; |
| 140 | struct buf *bp = ap->a_bp; |
| 141 | struct mfsnode *mfsp; |
| 142 | |
| 143 | if (vp->v_type != VBLK || vp->v_usecount == 0) |
| 144 | panic("mfs_strategy: bad dev" ); |
| 145 | mfsp = VTOMFS(vp); |
| 146 | /* check for mini-root access */ |
| 147 | if (mfsp->mfs_proc == NULL) { |
| 148 | void *base; |
| 149 | |
| 150 | base = (char *)mfsp->mfs_baseoff + (bp->b_blkno << DEV_BSHIFT); |
| 151 | if (bp->b_flags & B_READ) |
| 152 | memcpy(bp->b_data, base, bp->b_bcount); |
| 153 | else |
| 154 | memcpy(base, bp->b_data, bp->b_bcount); |
| 155 | bp->b_resid = 0; |
| 156 | biodone(bp); |
| 157 | } else if (mfsp->mfs_proc == curproc) { |
| 158 | mfs_doio(bp, mfsp->mfs_baseoff); |
| 159 | } else if (doing_shutdown) { |
| 160 | /* |
| 161 | * bitbucket I/O during shutdown. |
| 162 | * Note that reads should *not* happen here, but.. |
| 163 | */ |
| 164 | if (bp->b_flags & B_READ) |
| 165 | printf("warning: mfs read during shutdown\n" ); |
| 166 | bp->b_resid = 0; |
| 167 | biodone(bp); |
| 168 | } else { |
| 169 | mutex_enter(&mfs_lock); |
| 170 | bufq_put(mfsp->mfs_buflist, bp); |
| 171 | cv_broadcast(&mfsp->mfs_cv); |
| 172 | mutex_exit(&mfs_lock); |
| 173 | } |
| 174 | return (0); |
| 175 | } |
| 176 | |
| 177 | /* |
| 178 | * Memory file system I/O. |
| 179 | */ |
| 180 | void |
| 181 | mfs_doio(struct buf *bp, void *base) |
| 182 | { |
| 183 | |
| 184 | base = (char *)base + (bp->b_blkno << DEV_BSHIFT); |
| 185 | if (bp->b_flags & B_READ) |
| 186 | bp->b_error = copyin(base, bp->b_data, bp->b_bcount); |
| 187 | else |
| 188 | bp->b_error = copyout(bp->b_data, base, bp->b_bcount); |
| 189 | if (bp->b_error == 0) |
| 190 | bp->b_resid = 0; |
| 191 | biodone(bp); |
| 192 | } |
| 193 | |
| 194 | /* |
| 195 | * This is a noop, simply returning what one has been given. |
| 196 | */ |
| 197 | int |
| 198 | mfs_bmap(void *v) |
| 199 | { |
| 200 | struct vop_bmap_args /* { |
| 201 | struct vnode *a_vp; |
| 202 | daddr_t a_bn; |
| 203 | struct vnode **a_vpp; |
| 204 | daddr_t *a_bnp; |
| 205 | int *a_runp; |
| 206 | } */ *ap = v; |
| 207 | |
| 208 | if (ap->a_vpp != NULL) |
| 209 | *ap->a_vpp = ap->a_vp; |
| 210 | if (ap->a_bnp != NULL) |
| 211 | *ap->a_bnp = ap->a_bn; |
| 212 | if (ap->a_runp != NULL) |
| 213 | *ap->a_runp = 0; |
| 214 | return (0); |
| 215 | } |
| 216 | |
| 217 | /* |
| 218 | * Memory filesystem close routine |
| 219 | */ |
| 220 | /* ARGSUSED */ |
| 221 | int |
| 222 | mfs_close(void *v) |
| 223 | { |
| 224 | struct vop_close_args /* { |
| 225 | struct vnode *a_vp; |
| 226 | int a_fflag; |
| 227 | kauth_cred_t a_cred; |
| 228 | } */ *ap = v; |
| 229 | struct vnode *vp = ap->a_vp; |
| 230 | struct mfsnode *mfsp = VTOMFS(vp); |
| 231 | struct buf *bp; |
| 232 | int error; |
| 233 | |
| 234 | /* |
| 235 | * Finish any pending I/O requests. |
| 236 | */ |
| 237 | mutex_enter(&mfs_lock); |
| 238 | while ((bp = bufq_get(mfsp->mfs_buflist)) != NULL) { |
| 239 | mutex_exit(&mfs_lock); |
| 240 | mfs_doio(bp, mfsp->mfs_baseoff); |
| 241 | mutex_enter(&mfs_lock); |
| 242 | } |
| 243 | mutex_exit(&mfs_lock); |
| 244 | /* |
| 245 | * On last close of a memory filesystem |
| 246 | * we must invalidate any in core blocks, so that |
| 247 | * we can, free up its vnode. |
| 248 | */ |
| 249 | if ((error = vinvalbuf(vp, V_SAVE, ap->a_cred, curlwp, 0, 0)) != 0) |
| 250 | return (error); |
| 251 | /* |
| 252 | * There should be no way to have any more uses of this |
| 253 | * vnode, so if we find any other uses, it is a panic. |
| 254 | */ |
| 255 | if (bufq_peek(mfsp->mfs_buflist) != NULL) |
| 256 | panic("mfs_close" ); |
| 257 | /* |
| 258 | * Send a request to the filesystem server to exit. |
| 259 | */ |
| 260 | mutex_enter(&mfs_lock); |
| 261 | mfsp->mfs_shutdown = 1; |
| 262 | cv_broadcast(&mfsp->mfs_cv); |
| 263 | mutex_exit(&mfs_lock); |
| 264 | return (0); |
| 265 | } |
| 266 | |
| 267 | /* |
| 268 | * Memory filesystem inactive routine |
| 269 | */ |
| 270 | /* ARGSUSED */ |
| 271 | int |
| 272 | mfs_inactive(void *v) |
| 273 | { |
| 274 | struct vop_inactive_args /* { |
| 275 | struct vnode *a_vp; |
| 276 | } */ *ap = v; |
| 277 | struct vnode *vp = ap->a_vp; |
| 278 | struct mfsnode *mfsp = VTOMFS(vp); |
| 279 | |
| 280 | if (bufq_peek(mfsp->mfs_buflist) != NULL) |
| 281 | panic("mfs_inactive: not inactive (mfs_buflist %p)" , |
| 282 | bufq_peek(mfsp->mfs_buflist)); |
| 283 | |
| 284 | return VOCALL(spec_vnodeop_p, VOFFSET(vop_inactive), ap); |
| 285 | } |
| 286 | |
| 287 | /* |
| 288 | * Reclaim a memory filesystem devvp so that it can be reused. |
| 289 | */ |
| 290 | int |
| 291 | mfs_reclaim(void *v) |
| 292 | { |
| 293 | struct vop_reclaim_args /* { |
| 294 | struct vnode *a_vp; |
| 295 | } */ *ap = v; |
| 296 | struct vnode *vp = ap->a_vp; |
| 297 | struct mfsnode *mfsp = VTOMFS(vp); |
| 298 | int refcnt; |
| 299 | |
| 300 | mutex_enter(&mfs_lock); |
| 301 | vp->v_data = NULL; |
| 302 | refcnt = --mfsp->mfs_refcnt; |
| 303 | mutex_exit(&mfs_lock); |
| 304 | |
| 305 | if (refcnt == 0) { |
| 306 | bufq_free(mfsp->mfs_buflist); |
| 307 | cv_destroy(&mfsp->mfs_cv); |
| 308 | kmem_free(mfsp, sizeof(*mfsp)); |
| 309 | } |
| 310 | |
| 311 | return VOCALL(spec_vnodeop_p, VOFFSET(vop_reclaim), ap); |
| 312 | } |
| 313 | |
| 314 | /* |
| 315 | * Print out the contents of an mfsnode. |
| 316 | */ |
| 317 | int |
| 318 | mfs_print(void *v) |
| 319 | { |
| 320 | struct vop_print_args /* { |
| 321 | struct vnode *a_vp; |
| 322 | } */ *ap = v; |
| 323 | struct mfsnode *mfsp = VTOMFS(ap->a_vp); |
| 324 | |
| 325 | printf("tag VT_MFS, pid %d, base %p, size %ld\n" , |
| 326 | (mfsp->mfs_proc != NULL) ? mfsp->mfs_proc->p_pid : 0, |
| 327 | mfsp->mfs_baseoff, mfsp->mfs_size); |
| 328 | return (0); |
| 329 | } |
| 330 | |