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 | |