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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 int nilfs_dat_prepare_free(struct inode
*dat
, struct nilfs_palloc_req
*req
)
99 ret
= nilfs_palloc_prepare_free_entry(dat
, req
);
102 ret
= nilfs_dat_prepare_entry(dat
, req
, 0);
104 nilfs_palloc_abort_free_entry(dat
, req
);
110 void nilfs_dat_commit_free(struct inode
*dat
, struct nilfs_palloc_req
*req
)
112 struct nilfs_dat_entry
*entry
;
115 kaddr
= kmap_atomic(req
->pr_entry_bh
->b_page
, KM_USER0
);
116 entry
= nilfs_palloc_block_get_entry(dat
, req
->pr_entry_nr
,
117 req
->pr_entry_bh
, kaddr
);
118 entry
->de_start
= cpu_to_le64(NILFS_CNO_MIN
);
119 entry
->de_end
= cpu_to_le64(NILFS_CNO_MIN
);
120 entry
->de_blocknr
= cpu_to_le64(0);
121 kunmap_atomic(kaddr
, KM_USER0
);
123 nilfs_dat_commit_entry(dat
, req
);
124 nilfs_palloc_commit_free_entry(dat
, req
);
127 void nilfs_dat_abort_free(struct inode
*dat
, struct nilfs_palloc_req
*req
)
129 nilfs_dat_abort_entry(dat
, req
);
130 nilfs_palloc_abort_free_entry(dat
, req
);
133 int nilfs_dat_prepare_start(struct inode
*dat
, struct nilfs_palloc_req
*req
)
137 ret
= nilfs_dat_prepare_entry(dat
, req
, 0);
138 BUG_ON(ret
== -ENOENT
);
142 void nilfs_dat_commit_start(struct inode
*dat
, struct nilfs_palloc_req
*req
,
145 struct nilfs_dat_entry
*entry
;
148 kaddr
= kmap_atomic(req
->pr_entry_bh
->b_page
, KM_USER0
);
149 entry
= nilfs_palloc_block_get_entry(dat
, req
->pr_entry_nr
,
150 req
->pr_entry_bh
, kaddr
);
151 entry
->de_start
= cpu_to_le64(nilfs_mdt_cno(dat
));
152 if (entry
->de_blocknr
!= cpu_to_le64(0) ||
153 entry
->de_end
!= cpu_to_le64(NILFS_CNO_MAX
)) {
155 "%s: vbn = %llu, start = %llu, end = %llu, pbn = %llu\n",
156 __func__
, (unsigned long long)req
->pr_entry_nr
,
157 (unsigned long long)le64_to_cpu(entry
->de_start
),
158 (unsigned long long)le64_to_cpu(entry
->de_end
),
159 (unsigned long long)le64_to_cpu(entry
->de_blocknr
));
162 entry
->de_blocknr
= cpu_to_le64(blocknr
);
163 kunmap_atomic(kaddr
, KM_USER0
);
165 nilfs_dat_commit_entry(dat
, req
);
168 void nilfs_dat_abort_start(struct inode
*dat
, struct nilfs_palloc_req
*req
)
170 nilfs_dat_abort_entry(dat
, req
);
173 int nilfs_dat_prepare_end(struct inode
*dat
, struct nilfs_palloc_req
*req
)
175 struct nilfs_dat_entry
*entry
;
181 ret
= nilfs_dat_prepare_entry(dat
, req
, 0);
183 BUG_ON(ret
== -ENOENT
);
187 kaddr
= kmap_atomic(req
->pr_entry_bh
->b_page
, KM_USER0
);
188 entry
= nilfs_palloc_block_get_entry(dat
, req
->pr_entry_nr
,
189 req
->pr_entry_bh
, kaddr
);
190 start
= le64_to_cpu(entry
->de_start
);
191 blocknr
= le64_to_cpu(entry
->de_blocknr
);
192 kunmap_atomic(kaddr
, KM_USER0
);
195 ret
= nilfs_palloc_prepare_free_entry(dat
, req
);
197 nilfs_dat_abort_entry(dat
, req
);
205 void nilfs_dat_commit_end(struct inode
*dat
, struct nilfs_palloc_req
*req
,
208 struct nilfs_dat_entry
*entry
;
213 kaddr
= kmap_atomic(req
->pr_entry_bh
->b_page
, KM_USER0
);
214 entry
= nilfs_palloc_block_get_entry(dat
, req
->pr_entry_nr
,
215 req
->pr_entry_bh
, kaddr
);
216 end
= start
= le64_to_cpu(entry
->de_start
);
218 end
= nilfs_mdt_cno(dat
);
221 entry
->de_end
= cpu_to_le64(end
);
222 blocknr
= le64_to_cpu(entry
->de_blocknr
);
223 kunmap_atomic(kaddr
, KM_USER0
);
226 nilfs_dat_commit_free(dat
, req
);
228 nilfs_dat_commit_entry(dat
, req
);
231 void nilfs_dat_abort_end(struct inode
*dat
, struct nilfs_palloc_req
*req
)
233 struct nilfs_dat_entry
*entry
;
238 kaddr
= kmap_atomic(req
->pr_entry_bh
->b_page
, KM_USER0
);
239 entry
= nilfs_palloc_block_get_entry(dat
, req
->pr_entry_nr
,
240 req
->pr_entry_bh
, kaddr
);
241 start
= le64_to_cpu(entry
->de_start
);
242 blocknr
= le64_to_cpu(entry
->de_blocknr
);
243 kunmap_atomic(kaddr
, KM_USER0
);
245 if (start
== nilfs_mdt_cno(dat
) && blocknr
== 0)
246 nilfs_palloc_abort_free_entry(dat
, req
);
247 nilfs_dat_abort_entry(dat
, req
);
251 * nilfs_dat_mark_dirty -
252 * @dat: DAT file inode
253 * @vblocknr: virtual block number
257 * Return Value: On success, 0 is returned. On error, one of the following
258 * negative error codes is returned.
262 * %-ENOMEM - Insufficient amount of memory available.
264 int nilfs_dat_mark_dirty(struct inode
*dat
, __u64 vblocknr
)
266 struct nilfs_palloc_req req
;
269 req
.pr_entry_nr
= vblocknr
;
270 ret
= nilfs_dat_prepare_entry(dat
, &req
, 0);
272 nilfs_dat_commit_entry(dat
, &req
);
277 * nilfs_dat_freev - free virtual block numbers
278 * @dat: DAT file inode
279 * @vblocknrs: array of virtual block numbers
280 * @nitems: number of virtual block numbers
282 * Description: nilfs_dat_freev() frees the virtual block numbers specified by
283 * @vblocknrs and @nitems.
285 * Return Value: On success, 0 is returned. On error, one of the following
286 * nagative error codes is returned.
290 * %-ENOMEM - Insufficient amount of memory available.
292 * %-ENOENT - The virtual block number have not been allocated.
294 int nilfs_dat_freev(struct inode
*dat
, __u64
*vblocknrs
, size_t nitems
)
296 return nilfs_palloc_freev(dat
, vblocknrs
, nitems
);
300 * nilfs_dat_move - change a block number
301 * @dat: DAT file inode
302 * @vblocknr: virtual block number
303 * @blocknr: block number
305 * Description: nilfs_dat_move() changes the block number associated with
306 * @vblocknr to @blocknr.
308 * Return Value: On success, 0 is returned. On error, one of the following
309 * negative error codes is returned.
313 * %-ENOMEM - Insufficient amount of memory available.
315 int nilfs_dat_move(struct inode
*dat
, __u64 vblocknr
, sector_t blocknr
)
317 struct buffer_head
*entry_bh
;
318 struct nilfs_dat_entry
*entry
;
322 ret
= nilfs_palloc_get_entry_block(dat
, vblocknr
, 0, &entry_bh
);
325 kaddr
= kmap_atomic(entry_bh
->b_page
, KM_USER0
);
326 entry
= nilfs_palloc_block_get_entry(dat
, vblocknr
, entry_bh
, kaddr
);
327 if (entry
->de_blocknr
== cpu_to_le64(0)) {
328 printk(KERN_CRIT
"%s: vbn = %llu, [%llu, %llu)\n", __func__
,
329 (unsigned long long)vblocknr
,
330 (unsigned long long)le64_to_cpu(entry
->de_start
),
331 (unsigned long long)le64_to_cpu(entry
->de_end
));
334 BUG_ON(blocknr
== 0);
335 entry
->de_blocknr
= cpu_to_le64(blocknr
);
336 kunmap_atomic(kaddr
, KM_USER0
);
338 nilfs_mdt_mark_buffer_dirty(entry_bh
);
339 nilfs_mdt_mark_dirty(dat
);
347 * nilfs_dat_translate - translate a virtual block number to a block number
348 * @dat: DAT file inode
349 * @vblocknr: virtual block number
350 * @blocknrp: pointer to a block number
352 * Description: nilfs_dat_translate() maps the virtual block number @vblocknr
353 * to the corresponding block number.
355 * Return Value: On success, 0 is returned and the block number associated
356 * with @vblocknr is stored in the place pointed by @blocknrp. On error, one
357 * of the following negative error codes is returned.
361 * %-ENOMEM - Insufficient amount of memory available.
363 * %-ENOENT - A block number associated with @vblocknr does not exist.
365 int nilfs_dat_translate(struct inode
*dat
, __u64 vblocknr
, sector_t
*blocknrp
)
367 struct buffer_head
*entry_bh
;
368 struct nilfs_dat_entry
*entry
;
373 ret
= nilfs_palloc_get_entry_block(dat
, vblocknr
, 0, &entry_bh
);
377 kaddr
= kmap_atomic(entry_bh
->b_page
, KM_USER0
);
378 entry
= nilfs_palloc_block_get_entry(dat
, vblocknr
, entry_bh
, kaddr
);
379 blocknr
= le64_to_cpu(entry
->de_blocknr
);
384 if (blocknrp
!= NULL
)
388 kunmap_atomic(kaddr
, KM_USER0
);
393 ssize_t
nilfs_dat_get_vinfo(struct inode
*dat
, struct nilfs_vinfo
*vinfo
,
396 struct buffer_head
*entry_bh
;
397 struct nilfs_dat_entry
*entry
;
400 unsigned long entries_per_block
= NILFS_MDT(dat
)->mi_entries_per_block
;
403 for (i
= 0; i
< nvi
; i
+= n
) {
404 ret
= nilfs_palloc_get_entry_block(dat
, vinfo
[i
].vi_vblocknr
,
408 kaddr
= kmap_atomic(entry_bh
->b_page
, KM_USER0
);
409 /* last virtual block number in this block */
410 first
= vinfo
[i
].vi_vblocknr
;
411 do_div(first
, entries_per_block
);
412 first
*= entries_per_block
;
413 last
= first
+ entries_per_block
- 1;
415 j
< nvi
&& vinfo
[j
].vi_vblocknr
>= first
&&
416 vinfo
[j
].vi_vblocknr
<= last
;
418 entry
= nilfs_palloc_block_get_entry(
419 dat
, vinfo
[j
].vi_vblocknr
, entry_bh
, kaddr
);
420 vinfo
[j
].vi_start
= le64_to_cpu(entry
->de_start
);
421 vinfo
[j
].vi_end
= le64_to_cpu(entry
->de_end
);
422 vinfo
[j
].vi_blocknr
= le64_to_cpu(entry
->de_blocknr
);
424 kunmap_atomic(kaddr
, KM_USER0
);