-
Notifications
You must be signed in to change notification settings - Fork 261
/
ufs_inode.c
336 lines (296 loc) · 8.93 KB
/
ufs_inode.c
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
/* $NetBSD: ufs_inode.c,v 1.112 2020/09/05 16:30:13 riastradh Exp $ */
/*
* Copyright (c) 1991, 1993
* The Regents of the University of California. All rights reserved.
* (c) UNIX System Laboratories, Inc.
* All or some portions of this file are derived from material licensed
* to the University of California by American Telephone and Telegraph
* Co. or Unix System Laboratories, Inc. and are reproduced herein with
* the permission of UNIX System Laboratories, Inc.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* @(#)ufs_inode.c 8.9 (Berkeley) 5/14/95
*/
#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: ufs_inode.c,v 1.112 2020/09/05 16:30:13 riastradh Exp $");
#if defined(_KERNEL_OPT)
#include "opt_ffs.h"
#include "opt_quota.h"
#include "opt_wapbl.h"
#include "opt_uvmhist.h"
#endif
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/proc.h>
#include <sys/vnode.h>
#include <sys/mount.h>
#include <sys/kernel.h>
#include <sys/namei.h>
#include <sys/kauth.h>
#include <sys/wapbl.h>
#include <sys/kmem.h>
#include <ufs/ufs/inode.h>
#include <ufs/ufs/ufsmount.h>
#include <ufs/ufs/ufs_extern.h>
#include <ufs/ufs/ufs_wapbl.h>
#ifdef UFS_DIRHASH
#include <ufs/ufs/dirhash.h>
#endif
#ifdef UFS_EXTATTR
#include <ufs/ufs/extattr.h>
#endif
#ifdef UVMHIST
#include <uvm/uvm.h>
#endif
#include <uvm/uvm_page.h>
#include <uvm/uvm_stat.h>
/*
* Last reference to an inode. If necessary, write or delete it.
*/
int
ufs_inactive(void *v)
{
struct vop_inactive_v2_args /* {
struct vnode *a_vp;
struct bool *a_recycle;
} */ *ap = v;
struct vnode *vp = ap->a_vp;
struct inode *ip = VTOI(vp);
struct mount *mp = vp->v_mount;
mode_t mode;
int allerror = 0, error;
bool wapbl_locked = false;
UFS_WAPBL_JUNLOCK_ASSERT(mp);
/*
* Ignore inodes related to stale file handles.
*/
if (ip->i_mode == 0)
goto out;
if (ip->i_nlink <= 0 && (mp->mnt_flag & MNT_RDONLY) == 0) {
#ifdef UFS_EXTATTR
ufs_extattr_vnode_inactive(vp, curlwp);
#endif
/*
* All file blocks must be freed before we can let the vnode
* be reclaimed, so can't postpone full truncating any further.
*/
ufs_truncate_all(vp);
#if defined(QUOTA) || defined(QUOTA2)
error = UFS_WAPBL_BEGIN(mp);
if (error) {
allerror = error;
} else {
wapbl_locked = true;
(void)chkiq(ip, -1, NOCRED, 0);
}
#endif
DIP_ASSIGN(ip, rdev, 0);
mode = ip->i_mode;
ip->i_mode = 0;
ip->i_omode = mode;
DIP_ASSIGN(ip, mode, 0);
ip->i_flag |= IN_CHANGE | IN_UPDATE;
/*
* Defer final inode free and update to ufs_reclaim().
*/
}
if (ip->i_flag & (IN_CHANGE | IN_UPDATE | IN_MODIFIED)) {
if (! wapbl_locked) {
error = UFS_WAPBL_BEGIN(mp);
if (error) {
allerror = error;
goto out;
}
wapbl_locked = true;
}
UFS_UPDATE(vp, NULL, NULL, 0);
}
out:
if (wapbl_locked)
UFS_WAPBL_END(mp);
/*
* If we are done with the inode, reclaim it
* so that it can be reused immediately.
*/
*ap->a_recycle = (ip->i_mode == 0);
if (ip->i_mode == 0 && (DIP(ip, size) != 0 || DIP(ip, blocks) != 0)) {
printf("%s: unlinked ino %" PRId64 " on \"%s\" has"
" non zero size %" PRIx64 " or blocks %" PRIx64
" with allerror %d\n",
__func__, ip->i_number, mp->mnt_stat.f_mntonname,
DIP(ip, size), DIP(ip, blocks), allerror);
panic("%s: dirty filesystem?", __func__);
}
return (allerror);
}
/*
* Reclaim an inode so that it can be used for other purposes.
*/
int
ufs_reclaim(struct vnode *vp)
{
struct inode *ip = VTOI(vp);
if (!UFS_WAPBL_BEGIN(vp->v_mount)) {
UFS_UPDATE(vp, NULL, NULL, UPDATE_CLOSE);
UFS_WAPBL_END(vp->v_mount);
}
UFS_UPDATE(vp, NULL, NULL, UPDATE_CLOSE);
if (ip->i_devvp) {
vrele(ip->i_devvp);
ip->i_devvp = 0;
}
#if defined(QUOTA) || defined(QUOTA2)
ufsquota_free(ip);
#endif
#ifdef UFS_DIRHASH
if (ip->i_dirhash != NULL)
ufsdirhash_free(ip);
#endif
return (0);
}
/*
* allocate a range of blocks in a file.
* after this function returns, any page entirely contained within the range
* will map to invalid data and thus must be overwritten before it is made
* accessible to others.
*/
int
ufs_balloc_range(struct vnode *vp, off_t off, off_t len, kauth_cred_t cred,
int flags)
{
off_t neweof; /* file size after the operation */
off_t neweob; /* offset next to the last block after the operation */
off_t pagestart; /* starting offset of range covered by pgs */
off_t eob; /* offset next to allocated blocks */
struct uvm_object *uobj;
int i, delta, error, npages;
int bshift = vp->v_mount->mnt_fs_bshift;
int bsize = 1 << bshift;
int ppb = MAX(bsize >> PAGE_SHIFT, 1);
struct vm_page **pgs;
size_t pgssize;
UVMHIST_FUNC("ufs_balloc_range"); UVMHIST_CALLED(ubchist);
UVMHIST_LOG(ubchist, "vp %#jx off 0x%jx len 0x%jx u_size 0x%jx",
(uintptr_t)vp, off, len, vp->v_size);
neweof = MAX(vp->v_size, off + len);
GOP_SIZE(vp, neweof, &neweob, 0);
error = 0;
uobj = &vp->v_uobj;
/*
* read or create pages covering the range of the allocation and
* keep them locked until the new block is allocated, so there
* will be no window where the old contents of the new block are
* visible to racing threads.
*/
pagestart = trunc_page(off) & ~(bsize - 1);
npages = MIN(ppb, (round_page(neweob) - pagestart) >> PAGE_SHIFT);
pgssize = npages * sizeof(struct vm_page *);
pgs = kmem_zalloc(pgssize, KM_SLEEP);
/*
* adjust off to be block-aligned.
*/
delta = off & (bsize - 1);
off -= delta;
len += delta;
genfs_node_wrlock(vp);
rw_enter(uobj->vmobjlock, RW_WRITER);
error = VOP_GETPAGES(vp, pagestart, pgs, &npages, 0,
VM_PROT_WRITE, 0, PGO_SYNCIO | PGO_PASTEOF | PGO_NOBLOCKALLOC |
PGO_NOTIMESTAMP | PGO_GLOCKHELD);
if (error) {
genfs_node_unlock(vp);
goto out;
}
/*
* now allocate the range.
*/
error = GOP_ALLOC(vp, off, len, flags, cred);
genfs_node_unlock(vp);
/*
* if the allocation succeeded, mark all the pages dirty
* and clear PG_RDONLY on any pages that are now fully backed
* by disk blocks. if the allocation failed, we do not invalidate
* the pages since they might have already existed and been dirty,
* in which case we need to keep them around. if we created the pages,
* they will be clean and read-only, and leaving such pages
* in the cache won't cause any problems.
*/
GOP_SIZE(vp, off + len, &eob, 0);
rw_enter(uobj->vmobjlock, RW_WRITER);
for (i = 0; i < npages; i++) {
KASSERT((pgs[i]->flags & PG_RELEASED) == 0);
if (!error) {
if (off <= pagestart + (i << PAGE_SHIFT) &&
pagestart + ((i + 1) << PAGE_SHIFT) <= eob) {
pgs[i]->flags &= ~PG_RDONLY;
}
uvm_pagemarkdirty(pgs[i], UVM_PAGE_STATUS_DIRTY);
}
uvm_pagelock(pgs[i]);
uvm_pageactivate(pgs[i]);
uvm_pageunlock(pgs[i]);
}
uvm_page_unbusy(pgs, npages);
rw_exit(uobj->vmobjlock);
out:
kmem_free(pgs, pgssize);
return error;
}
int
ufs_truncate_retry(struct vnode *vp, int ioflag, uint64_t newsize,
kauth_cred_t cred)
{
struct inode *ip = VTOI(vp);
struct mount *mp = vp->v_mount;
int error = 0;
UFS_WAPBL_JUNLOCK_ASSERT(mp);
/*
* Truncate might temporarily fail, loop until done.
*/
do {
error = UFS_WAPBL_BEGIN(mp);
if (error)
goto out;
error = UFS_TRUNCATE(vp, newsize, ioflag, cred);
UFS_WAPBL_END(mp);
if (error != 0 && error != EAGAIN)
goto out;
} while (ip->i_size != newsize);
out:
return error;
}
/* truncate all the data of the inode including extended attributes */
int
ufs_truncate_all(struct vnode *vp)
{
struct inode *ip = VTOI(vp);
off_t isize = ip->i_size;
if (ip->i_ump->um_fstype == UFS2)
isize += ip->i_ffs2_extsize;
if (isize == 0)
return 0;
return ufs_truncate_retry(vp, IO_NORMAL | IO_EXT, 0, NOCRED);
}