2 * dat.c - NILFS disk address translation.
4 * Copyright (C) 2006-2008 Nippon Telegraph and Telephone Corporation.
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 2 of the License, or
9 * (at your option) any later version.
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
16 * You should have received a copy of the GNU General Public License
17 * along with this program; if not, write to the Free Software
18 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
20 * Written by Koji Sato <koji@osrg.net>.
23 #include <linux/types.h>
24 #include <linux/buffer_head.h>
25 #include <linux/string.h>
26 #include <linux/errno.h>
33 #define NILFS_CNO_MIN ((__u64)1)
34 #define NILFS_CNO_MAX (~(__u64)0)
36 static int nilfs_dat_prepare_entry(struct inode
*dat
,
37 struct nilfs_palloc_req
*req
, int create
)
39 return nilfs_palloc_get_entry_block(dat
, req
->pr_entry_nr
,
40 create
, &req
->pr_entry_bh
);
43 static void nilfs_dat_commit_entry(struct inode
*dat
,
44 struct nilfs_palloc_req
*req
)
46 nilfs_mdt_mark_buffer_dirty(req
->pr_entry_bh
);
47 nilfs_mdt_mark_dirty(dat
);
48 brelse(req
->pr_entry_bh
);
51 static void nilfs_dat_abort_entry(struct inode
*dat
,
52 struct nilfs_palloc_req
*req
)
54 brelse(req
->pr_entry_bh
);
57 int nilfs_dat_prepare_alloc(struct inode
*dat
, struct nilfs_palloc_req
*req
)
61 ret
= nilfs_palloc_prepare_alloc_entry(dat
, req
);
65 ret
= nilfs_dat_prepare_entry(dat
, req
, 1);
67 nilfs_palloc_abort_alloc_entry(dat
, req
);
72 void nilfs_dat_commit_alloc(struct inode
*dat
, struct nilfs_palloc_req
*req
)
74 struct nilfs_dat_entry
*entry
;
77 kaddr
= kmap_atomic(req
->pr_entry_bh
->b_page
, KM_USER0
);
78 entry
= nilfs_palloc_block_get_entry(dat
, req
->pr_entry_nr
,
79 req
->pr_entry_bh
, kaddr
);
80 entry
->de_start
= cpu_to_le64(NILFS_CNO_MIN
);
81 entry
->de_end
= cpu_to_le64(NILFS_CNO_MAX
);
82 entry
->de_blocknr
= cpu_to_le64(0);
83 kunmap_atomic(kaddr
, KM_USER0
);
85 nilfs_palloc_commit_alloc_entry(dat
, req
);
86 nilfs_dat_commit_entry(dat
, req
);
89 void nilfs_dat_abort_alloc(struct inode
*dat
, struct nilfs_palloc_req
*req
)
91 nilfs_dat_abort_entry(dat
, req
);
92 nilfs_palloc_abort_alloc_entry(dat
, req
);
95 void nilfs_dat_commit_free(struct inode
*dat
, struct nilfs_palloc_req
*req
)
97 struct nilfs_dat_entry
*entry
;
100 kaddr
= kmap_atomic(req
->pr_entry_bh
->b_page
, KM_USER0
);
101 entry
= nilfs_palloc_block_get_entry(dat
, req
->pr_entry_nr
,
102 req
->pr_entry_bh
, kaddr
);
103 entry
->de_start
= cpu_to_le64(NILFS_CNO_MIN
);
104 entry
->de_end
= cpu_to_le64(NILFS_CNO_MIN
);
105 entry
->de_blocknr
= cpu_to_le64(0);
106 kunmap_atomic(kaddr
, KM_USER0
);
108 nilfs_dat_commit_entry(dat
, req
);
109 nilfs_palloc_commit_free_entry(dat
, req
);
112 void nilfs_dat_abort_free(struct inode
*dat
, struct nilfs_palloc_req
*req
)
114 nilfs_dat_abort_entry(dat
, req
);
115 nilfs_palloc_abort_free_entry(dat
, req
);
118 int nilfs_dat_prepare_start(struct inode
*dat
, struct nilfs_palloc_req
*req
)
122 ret
= nilfs_dat_prepare_entry(dat
, req
, 0);
123 WARN_ON(ret
== -ENOENT
);
127 void nilfs_dat_commit_start(struct inode
*dat
, struct nilfs_palloc_req
*req
,
130 struct nilfs_dat_entry
*entry
;
133 kaddr
= kmap_atomic(req
->pr_entry_bh
->b_page
, KM_USER0
);
134 entry
= nilfs_palloc_block_get_entry(dat
, req
->pr_entry_nr
,
135 req
->pr_entry_bh
, kaddr
);
136 entry
->de_start
= cpu_to_le64(nilfs_mdt_cno(dat
));
137 if (entry
->de_blocknr
!= cpu_to_le64(0) ||
138 entry
->de_end
!= cpu_to_le64(NILFS_CNO_MAX
)) {
140 "%s: vbn = %llu, start = %llu, end = %llu, pbn = %llu\n",
141 __func__
, (unsigned long long)req
->pr_entry_nr
,
142 (unsigned long long)le64_to_cpu(entry
->de_start
),
143 (unsigned long long)le64_to_cpu(entry
->de_end
),
144 (unsigned long long)le64_to_cpu(entry
->de_blocknr
));
146 entry
->de_blocknr
= cpu_to_le64(blocknr
);
147 kunmap_atomic(kaddr
, KM_USER0
);
149 nilfs_dat_commit_entry(dat
, req
);
152 void nilfs_dat_abort_start(struct inode
*dat
, struct nilfs_palloc_req
*req
)
154 nilfs_dat_abort_entry(dat
, req
);
157 int nilfs_dat_prepare_end(struct inode
*dat
, struct nilfs_palloc_req
*req
)
159 struct nilfs_dat_entry
*entry
;
165 ret
= nilfs_dat_prepare_entry(dat
, req
, 0);
167 WARN_ON(ret
== -ENOENT
);
171 kaddr
= kmap_atomic(req
->pr_entry_bh
->b_page
, KM_USER0
);
172 entry
= nilfs_palloc_block_get_entry(dat
, req
->pr_entry_nr
,
173 req
->pr_entry_bh
, kaddr
);
174 start
= le64_to_cpu(entry
->de_start
);
175 blocknr
= le64_to_cpu(entry
->de_blocknr
);
176 kunmap_atomic(kaddr
, KM_USER0
);
179 ret
= nilfs_palloc_prepare_free_entry(dat
, req
);
181 nilfs_dat_abort_entry(dat
, req
);
189 void nilfs_dat_commit_end(struct inode
*dat
, struct nilfs_palloc_req
*req
,
192 struct nilfs_dat_entry
*entry
;
197 kaddr
= kmap_atomic(req
->pr_entry_bh
->b_page
, KM_USER0
);
198 entry
= nilfs_palloc_block_get_entry(dat
, req
->pr_entry_nr
,
199 req
->pr_entry_bh
, kaddr
);
200 end
= start
= le64_to_cpu(entry
->de_start
);
202 end
= nilfs_mdt_cno(dat
);
203 WARN_ON(start
> end
);
205 entry
->de_end
= cpu_to_le64(end
);
206 blocknr
= le64_to_cpu(entry
->de_blocknr
);
207 kunmap_atomic(kaddr
, KM_USER0
);
210 nilfs_dat_commit_free(dat
, req
);
212 nilfs_dat_commit_entry(dat
, req
);
215 void nilfs_dat_abort_end(struct inode
*dat
, struct nilfs_palloc_req
*req
)
217 struct nilfs_dat_entry
*entry
;
222 kaddr
= kmap_atomic(req
->pr_entry_bh
->b_page
, KM_USER0
);
223 entry
= nilfs_palloc_block_get_entry(dat
, req
->pr_entry_nr
,
224 req
->pr_entry_bh
, kaddr
);
225 start
= le64_to_cpu(entry
->de_start
);
226 blocknr
= le64_to_cpu(entry
->de_blocknr
);
227 kunmap_atomic(kaddr
, KM_USER0
);
229 if (start
== nilfs_mdt_cno(dat
) && blocknr
== 0)
230 nilfs_palloc_abort_free_entry(dat
, req
);
231 nilfs_dat_abort_entry(dat
, req
);
235 * nilfs_dat_mark_dirty -
236 * @dat: DAT file inode
237 * @vblocknr: virtual block number
241 * Return Value: On success, 0 is returned. On error, one of the following
242 * negative error codes is returned.
246 * %-ENOMEM - Insufficient amount of memory available.
248 int nilfs_dat_mark_dirty(struct inode
*dat
, __u64 vblocknr
)
250 struct nilfs_palloc_req req
;
253 req
.pr_entry_nr
= vblocknr
;
254 ret
= nilfs_dat_prepare_entry(dat
, &req
, 0);
256 nilfs_dat_commit_entry(dat
, &req
);
261 * nilfs_dat_freev - free virtual block numbers
262 * @dat: DAT file inode
263 * @vblocknrs: array of virtual block numbers
264 * @nitems: number of virtual block numbers
266 * Description: nilfs_dat_freev() frees the virtual block numbers specified by
267 * @vblocknrs and @nitems.
269 * Return Value: On success, 0 is returned. On error, one of the following
270 * nagative error codes is returned.
274 * %-ENOMEM - Insufficient amount of memory available.
276 * %-ENOENT - The virtual block number have not been allocated.
278 int nilfs_dat_freev(struct inode
*dat
, __u64
*vblocknrs
, size_t nitems
)
280 return nilfs_palloc_freev(dat
, vblocknrs
, nitems
);
284 * nilfs_dat_move - change a block number
285 * @dat: DAT file inode
286 * @vblocknr: virtual block number
287 * @blocknr: block number
289 * Description: nilfs_dat_move() changes the block number associated with
290 * @vblocknr to @blocknr.
292 * Return Value: On success, 0 is returned. On error, one of the following
293 * negative error codes is returned.
297 * %-ENOMEM - Insufficient amount of memory available.
299 int nilfs_dat_move(struct inode
*dat
, __u64 vblocknr
, sector_t blocknr
)
301 struct buffer_head
*entry_bh
;
302 struct nilfs_dat_entry
*entry
;
306 ret
= nilfs_palloc_get_entry_block(dat
, vblocknr
, 0, &entry_bh
);
309 kaddr
= kmap_atomic(entry_bh
->b_page
, KM_USER0
);
310 entry
= nilfs_palloc_block_get_entry(dat
, vblocknr
, entry_bh
, kaddr
);
311 if (unlikely(entry
->de_blocknr
== cpu_to_le64(0))) {
312 printk(KERN_CRIT
"%s: vbn = %llu, [%llu, %llu)\n", __func__
,
313 (unsigned long long)vblocknr
,
314 (unsigned long long)le64_to_cpu(entry
->de_start
),
315 (unsigned long long)le64_to_cpu(entry
->de_end
));
316 kunmap_atomic(kaddr
, KM_USER0
);
320 WARN_ON(blocknr
== 0);
321 entry
->de_blocknr
= cpu_to_le64(blocknr
);
322 kunmap_atomic(kaddr
, KM_USER0
);
324 nilfs_mdt_mark_buffer_dirty(entry_bh
);
325 nilfs_mdt_mark_dirty(dat
);
333 * nilfs_dat_translate - translate a virtual block number to a block number
334 * @dat: DAT file inode
335 * @vblocknr: virtual block number
336 * @blocknrp: pointer to a block number
338 * Description: nilfs_dat_translate() maps the virtual block number @vblocknr
339 * to the corresponding block number.
341 * Return Value: On success, 0 is returned and the block number associated
342 * with @vblocknr is stored in the place pointed by @blocknrp. On error, one
343 * of the following negative error codes is returned.
347 * %-ENOMEM - Insufficient amount of memory available.
349 * %-ENOENT - A block number associated with @vblocknr does not exist.
351 int nilfs_dat_translate(struct inode
*dat
, __u64 vblocknr
, sector_t
*blocknrp
)
353 struct buffer_head
*entry_bh
;
354 struct nilfs_dat_entry
*entry
;
359 ret
= nilfs_palloc_get_entry_block(dat
, vblocknr
, 0, &entry_bh
);
363 kaddr
= kmap_atomic(entry_bh
->b_page
, KM_USER0
);
364 entry
= nilfs_palloc_block_get_entry(dat
, vblocknr
, entry_bh
, kaddr
);
365 blocknr
= le64_to_cpu(entry
->de_blocknr
);
370 if (blocknrp
!= NULL
)
374 kunmap_atomic(kaddr
, KM_USER0
);
379 ssize_t
nilfs_dat_get_vinfo(struct inode
*dat
, void *buf
, unsigned visz
,
382 struct buffer_head
*entry_bh
;
383 struct nilfs_dat_entry
*entry
;
384 struct nilfs_vinfo
*vinfo
= buf
;
387 unsigned long entries_per_block
= NILFS_MDT(dat
)->mi_entries_per_block
;
390 for (i
= 0; i
< nvi
; i
+= n
) {
391 ret
= nilfs_palloc_get_entry_block(dat
, vinfo
->vi_vblocknr
,
395 kaddr
= kmap_atomic(entry_bh
->b_page
, KM_USER0
);
396 /* last virtual block number in this block */
397 first
= vinfo
->vi_vblocknr
;
398 do_div(first
, entries_per_block
);
399 first
*= entries_per_block
;
400 last
= first
+ entries_per_block
- 1;
402 j
< nvi
&& vinfo
->vi_vblocknr
>= first
&&
403 vinfo
->vi_vblocknr
<= last
;
404 j
++, n
++, vinfo
= (void *)vinfo
+ visz
) {
405 entry
= nilfs_palloc_block_get_entry(
406 dat
, vinfo
->vi_vblocknr
, entry_bh
, kaddr
);
407 vinfo
->vi_start
= le64_to_cpu(entry
->de_start
);
408 vinfo
->vi_end
= le64_to_cpu(entry
->de_end
);
409 vinfo
->vi_blocknr
= le64_to_cpu(entry
->de_blocknr
);
411 kunmap_atomic(kaddr
, KM_USER0
);
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