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a17564f5 KS |
1 | /* |
2 | * dat.c - NILFS disk address translation. | |
3 | * | |
4 | * Copyright (C) 2006-2008 Nippon Telegraph and Telephone Corporation. | |
5 | * | |
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. | |
10 | * | |
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. | |
15 | * | |
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 | |
19 | * | |
20 | * Written by Koji Sato <koji@osrg.net>. | |
21 | */ | |
22 | ||
23 | #include <linux/types.h> | |
24 | #include <linux/buffer_head.h> | |
25 | #include <linux/string.h> | |
26 | #include <linux/errno.h> | |
27 | #include "nilfs.h" | |
28 | #include "mdt.h" | |
29 | #include "alloc.h" | |
30 | #include "dat.h" | |
31 | ||
32 | ||
33 | #define NILFS_CNO_MIN ((__u64)1) | |
34 | #define NILFS_CNO_MAX (~(__u64)0) | |
35 | ||
36 | static int nilfs_dat_prepare_entry(struct inode *dat, | |
37 | struct nilfs_palloc_req *req, int create) | |
38 | { | |
39 | return nilfs_palloc_get_entry_block(dat, req->pr_entry_nr, | |
40 | create, &req->pr_entry_bh); | |
41 | } | |
42 | ||
43 | static void nilfs_dat_commit_entry(struct inode *dat, | |
44 | struct nilfs_palloc_req *req) | |
45 | { | |
46 | nilfs_mdt_mark_buffer_dirty(req->pr_entry_bh); | |
47 | nilfs_mdt_mark_dirty(dat); | |
48 | brelse(req->pr_entry_bh); | |
49 | } | |
50 | ||
51 | static void nilfs_dat_abort_entry(struct inode *dat, | |
52 | struct nilfs_palloc_req *req) | |
53 | { | |
54 | brelse(req->pr_entry_bh); | |
55 | } | |
56 | ||
57 | int nilfs_dat_prepare_alloc(struct inode *dat, struct nilfs_palloc_req *req) | |
58 | { | |
59 | int ret; | |
60 | ||
61 | ret = nilfs_palloc_prepare_alloc_entry(dat, req); | |
62 | if (ret < 0) | |
63 | return ret; | |
64 | ||
65 | ret = nilfs_dat_prepare_entry(dat, req, 1); | |
66 | if (ret < 0) | |
67 | nilfs_palloc_abort_alloc_entry(dat, req); | |
68 | ||
69 | return ret; | |
70 | } | |
71 | ||
72 | void nilfs_dat_commit_alloc(struct inode *dat, struct nilfs_palloc_req *req) | |
73 | { | |
74 | struct nilfs_dat_entry *entry; | |
75 | void *kaddr; | |
76 | ||
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); | |
84 | ||
85 | nilfs_palloc_commit_alloc_entry(dat, req); | |
86 | nilfs_dat_commit_entry(dat, req); | |
87 | } | |
88 | ||
89 | void nilfs_dat_abort_alloc(struct inode *dat, struct nilfs_palloc_req *req) | |
90 | { | |
91 | nilfs_dat_abort_entry(dat, req); | |
92 | nilfs_palloc_abort_alloc_entry(dat, req); | |
93 | } | |
94 | ||
a17564f5 KS |
95 | void nilfs_dat_commit_free(struct inode *dat, struct nilfs_palloc_req *req) |
96 | { | |
97 | struct nilfs_dat_entry *entry; | |
98 | void *kaddr; | |
99 | ||
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); | |
107 | ||
108 | nilfs_dat_commit_entry(dat, req); | |
109 | nilfs_palloc_commit_free_entry(dat, req); | |
110 | } | |
111 | ||
a17564f5 KS |
112 | int nilfs_dat_prepare_start(struct inode *dat, struct nilfs_palloc_req *req) |
113 | { | |
114 | int ret; | |
115 | ||
116 | ret = nilfs_dat_prepare_entry(dat, req, 0); | |
1f5abe7e | 117 | WARN_ON(ret == -ENOENT); |
a17564f5 KS |
118 | return ret; |
119 | } | |
120 | ||
121 | void nilfs_dat_commit_start(struct inode *dat, struct nilfs_palloc_req *req, | |
122 | sector_t blocknr) | |
123 | { | |
124 | struct nilfs_dat_entry *entry; | |
125 | void *kaddr; | |
126 | ||
127 | kaddr = kmap_atomic(req->pr_entry_bh->b_page, KM_USER0); | |
128 | entry = nilfs_palloc_block_get_entry(dat, req->pr_entry_nr, | |
129 | req->pr_entry_bh, kaddr); | |
130 | entry->de_start = cpu_to_le64(nilfs_mdt_cno(dat)); | |
a17564f5 KS |
131 | entry->de_blocknr = cpu_to_le64(blocknr); |
132 | kunmap_atomic(kaddr, KM_USER0); | |
133 | ||
134 | nilfs_dat_commit_entry(dat, req); | |
135 | } | |
136 | ||
a17564f5 KS |
137 | int nilfs_dat_prepare_end(struct inode *dat, struct nilfs_palloc_req *req) |
138 | { | |
139 | struct nilfs_dat_entry *entry; | |
140 | __u64 start; | |
141 | sector_t blocknr; | |
142 | void *kaddr; | |
143 | int ret; | |
144 | ||
145 | ret = nilfs_dat_prepare_entry(dat, req, 0); | |
146 | if (ret < 0) { | |
1f5abe7e | 147 | WARN_ON(ret == -ENOENT); |
a17564f5 KS |
148 | return ret; |
149 | } | |
150 | ||
151 | kaddr = kmap_atomic(req->pr_entry_bh->b_page, KM_USER0); | |
152 | entry = nilfs_palloc_block_get_entry(dat, req->pr_entry_nr, | |
153 | req->pr_entry_bh, kaddr); | |
154 | start = le64_to_cpu(entry->de_start); | |
155 | blocknr = le64_to_cpu(entry->de_blocknr); | |
156 | kunmap_atomic(kaddr, KM_USER0); | |
157 | ||
158 | if (blocknr == 0) { | |
159 | ret = nilfs_palloc_prepare_free_entry(dat, req); | |
160 | if (ret < 0) { | |
161 | nilfs_dat_abort_entry(dat, req); | |
162 | return ret; | |
163 | } | |
164 | } | |
165 | ||
166 | return 0; | |
167 | } | |
168 | ||
169 | void nilfs_dat_commit_end(struct inode *dat, struct nilfs_palloc_req *req, | |
170 | int dead) | |
171 | { | |
172 | struct nilfs_dat_entry *entry; | |
173 | __u64 start, end; | |
174 | sector_t blocknr; | |
175 | void *kaddr; | |
176 | ||
177 | kaddr = kmap_atomic(req->pr_entry_bh->b_page, KM_USER0); | |
178 | entry = nilfs_palloc_block_get_entry(dat, req->pr_entry_nr, | |
179 | req->pr_entry_bh, kaddr); | |
180 | end = start = le64_to_cpu(entry->de_start); | |
181 | if (!dead) { | |
182 | end = nilfs_mdt_cno(dat); | |
1f5abe7e | 183 | WARN_ON(start > end); |
a17564f5 KS |
184 | } |
185 | entry->de_end = cpu_to_le64(end); | |
186 | blocknr = le64_to_cpu(entry->de_blocknr); | |
187 | kunmap_atomic(kaddr, KM_USER0); | |
188 | ||
189 | if (blocknr == 0) | |
190 | nilfs_dat_commit_free(dat, req); | |
191 | else | |
192 | nilfs_dat_commit_entry(dat, req); | |
193 | } | |
194 | ||
195 | void nilfs_dat_abort_end(struct inode *dat, struct nilfs_palloc_req *req) | |
196 | { | |
197 | struct nilfs_dat_entry *entry; | |
198 | __u64 start; | |
199 | sector_t blocknr; | |
200 | void *kaddr; | |
201 | ||
202 | kaddr = kmap_atomic(req->pr_entry_bh->b_page, KM_USER0); | |
203 | entry = nilfs_palloc_block_get_entry(dat, req->pr_entry_nr, | |
204 | req->pr_entry_bh, kaddr); | |
205 | start = le64_to_cpu(entry->de_start); | |
206 | blocknr = le64_to_cpu(entry->de_blocknr); | |
207 | kunmap_atomic(kaddr, KM_USER0); | |
208 | ||
209 | if (start == nilfs_mdt_cno(dat) && blocknr == 0) | |
210 | nilfs_palloc_abort_free_entry(dat, req); | |
211 | nilfs_dat_abort_entry(dat, req); | |
212 | } | |
213 | ||
bd8169ef RK |
214 | int nilfs_dat_prepare_update(struct inode *dat, |
215 | struct nilfs_palloc_req *oldreq, | |
216 | struct nilfs_palloc_req *newreq) | |
217 | { | |
218 | int ret; | |
219 | ||
220 | ret = nilfs_dat_prepare_end(dat, oldreq); | |
221 | if (!ret) { | |
222 | ret = nilfs_dat_prepare_alloc(dat, newreq); | |
223 | if (ret < 0) | |
224 | nilfs_dat_abort_end(dat, oldreq); | |
225 | } | |
226 | return ret; | |
227 | } | |
228 | ||
229 | void nilfs_dat_commit_update(struct inode *dat, | |
230 | struct nilfs_palloc_req *oldreq, | |
231 | struct nilfs_palloc_req *newreq, int dead) | |
232 | { | |
233 | nilfs_dat_commit_end(dat, oldreq, dead); | |
234 | nilfs_dat_commit_alloc(dat, newreq); | |
235 | } | |
236 | ||
237 | void nilfs_dat_abort_update(struct inode *dat, | |
238 | struct nilfs_palloc_req *oldreq, | |
239 | struct nilfs_palloc_req *newreq) | |
240 | { | |
241 | nilfs_dat_abort_end(dat, oldreq); | |
242 | nilfs_dat_abort_alloc(dat, newreq); | |
243 | } | |
244 | ||
a17564f5 KS |
245 | /** |
246 | * nilfs_dat_mark_dirty - | |
247 | * @dat: DAT file inode | |
248 | * @vblocknr: virtual block number | |
249 | * | |
250 | * Description: | |
251 | * | |
252 | * Return Value: On success, 0 is returned. On error, one of the following | |
253 | * negative error codes is returned. | |
254 | * | |
255 | * %-EIO - I/O error. | |
256 | * | |
257 | * %-ENOMEM - Insufficient amount of memory available. | |
258 | */ | |
259 | int nilfs_dat_mark_dirty(struct inode *dat, __u64 vblocknr) | |
260 | { | |
261 | struct nilfs_palloc_req req; | |
262 | int ret; | |
263 | ||
264 | req.pr_entry_nr = vblocknr; | |
265 | ret = nilfs_dat_prepare_entry(dat, &req, 0); | |
266 | if (ret == 0) | |
267 | nilfs_dat_commit_entry(dat, &req); | |
268 | return ret; | |
269 | } | |
270 | ||
271 | /** | |
272 | * nilfs_dat_freev - free virtual block numbers | |
273 | * @dat: DAT file inode | |
274 | * @vblocknrs: array of virtual block numbers | |
275 | * @nitems: number of virtual block numbers | |
276 | * | |
277 | * Description: nilfs_dat_freev() frees the virtual block numbers specified by | |
278 | * @vblocknrs and @nitems. | |
279 | * | |
280 | * Return Value: On success, 0 is returned. On error, one of the following | |
281 | * nagative error codes is returned. | |
282 | * | |
283 | * %-EIO - I/O error. | |
284 | * | |
285 | * %-ENOMEM - Insufficient amount of memory available. | |
286 | * | |
287 | * %-ENOENT - The virtual block number have not been allocated. | |
288 | */ | |
289 | int nilfs_dat_freev(struct inode *dat, __u64 *vblocknrs, size_t nitems) | |
290 | { | |
291 | return nilfs_palloc_freev(dat, vblocknrs, nitems); | |
292 | } | |
293 | ||
294 | /** | |
295 | * nilfs_dat_move - change a block number | |
296 | * @dat: DAT file inode | |
297 | * @vblocknr: virtual block number | |
298 | * @blocknr: block number | |
299 | * | |
300 | * Description: nilfs_dat_move() changes the block number associated with | |
301 | * @vblocknr to @blocknr. | |
302 | * | |
303 | * Return Value: On success, 0 is returned. On error, one of the following | |
304 | * negative error codes is returned. | |
305 | * | |
306 | * %-EIO - I/O error. | |
307 | * | |
308 | * %-ENOMEM - Insufficient amount of memory available. | |
309 | */ | |
310 | int nilfs_dat_move(struct inode *dat, __u64 vblocknr, sector_t blocknr) | |
311 | { | |
312 | struct buffer_head *entry_bh; | |
313 | struct nilfs_dat_entry *entry; | |
314 | void *kaddr; | |
315 | int ret; | |
316 | ||
317 | ret = nilfs_palloc_get_entry_block(dat, vblocknr, 0, &entry_bh); | |
318 | if (ret < 0) | |
319 | return ret; | |
320 | kaddr = kmap_atomic(entry_bh->b_page, KM_USER0); | |
321 | entry = nilfs_palloc_block_get_entry(dat, vblocknr, entry_bh, kaddr); | |
1f5abe7e | 322 | if (unlikely(entry->de_blocknr == cpu_to_le64(0))) { |
a17564f5 KS |
323 | printk(KERN_CRIT "%s: vbn = %llu, [%llu, %llu)\n", __func__, |
324 | (unsigned long long)vblocknr, | |
325 | (unsigned long long)le64_to_cpu(entry->de_start), | |
326 | (unsigned long long)le64_to_cpu(entry->de_end)); | |
1f5abe7e RK |
327 | kunmap_atomic(kaddr, KM_USER0); |
328 | brelse(entry_bh); | |
329 | return -EINVAL; | |
a17564f5 | 330 | } |
1f5abe7e | 331 | WARN_ON(blocknr == 0); |
a17564f5 KS |
332 | entry->de_blocknr = cpu_to_le64(blocknr); |
333 | kunmap_atomic(kaddr, KM_USER0); | |
334 | ||
335 | nilfs_mdt_mark_buffer_dirty(entry_bh); | |
336 | nilfs_mdt_mark_dirty(dat); | |
337 | ||
338 | brelse(entry_bh); | |
339 | ||
340 | return 0; | |
341 | } | |
342 | ||
343 | /** | |
344 | * nilfs_dat_translate - translate a virtual block number to a block number | |
345 | * @dat: DAT file inode | |
346 | * @vblocknr: virtual block number | |
347 | * @blocknrp: pointer to a block number | |
348 | * | |
349 | * Description: nilfs_dat_translate() maps the virtual block number @vblocknr | |
350 | * to the corresponding block number. | |
351 | * | |
352 | * Return Value: On success, 0 is returned and the block number associated | |
353 | * with @vblocknr is stored in the place pointed by @blocknrp. On error, one | |
354 | * of the following negative error codes is returned. | |
355 | * | |
356 | * %-EIO - I/O error. | |
357 | * | |
358 | * %-ENOMEM - Insufficient amount of memory available. | |
359 | * | |
360 | * %-ENOENT - A block number associated with @vblocknr does not exist. | |
361 | */ | |
362 | int nilfs_dat_translate(struct inode *dat, __u64 vblocknr, sector_t *blocknrp) | |
363 | { | |
364 | struct buffer_head *entry_bh; | |
365 | struct nilfs_dat_entry *entry; | |
366 | sector_t blocknr; | |
367 | void *kaddr; | |
368 | int ret; | |
369 | ||
370 | ret = nilfs_palloc_get_entry_block(dat, vblocknr, 0, &entry_bh); | |
371 | if (ret < 0) | |
372 | return ret; | |
373 | ||
374 | kaddr = kmap_atomic(entry_bh->b_page, KM_USER0); | |
375 | entry = nilfs_palloc_block_get_entry(dat, vblocknr, entry_bh, kaddr); | |
376 | blocknr = le64_to_cpu(entry->de_blocknr); | |
377 | if (blocknr == 0) { | |
378 | ret = -ENOENT; | |
379 | goto out; | |
380 | } | |
381 | if (blocknrp != NULL) | |
382 | *blocknrp = blocknr; | |
383 | ||
384 | out: | |
385 | kunmap_atomic(kaddr, KM_USER0); | |
386 | brelse(entry_bh); | |
387 | return ret; | |
388 | } | |
389 | ||
003ff182 | 390 | ssize_t nilfs_dat_get_vinfo(struct inode *dat, void *buf, unsigned visz, |
a17564f5 KS |
391 | size_t nvi) |
392 | { | |
393 | struct buffer_head *entry_bh; | |
394 | struct nilfs_dat_entry *entry; | |
003ff182 | 395 | struct nilfs_vinfo *vinfo = buf; |
a17564f5 KS |
396 | __u64 first, last; |
397 | void *kaddr; | |
398 | unsigned long entries_per_block = NILFS_MDT(dat)->mi_entries_per_block; | |
399 | int i, j, n, ret; | |
400 | ||
401 | for (i = 0; i < nvi; i += n) { | |
003ff182 | 402 | ret = nilfs_palloc_get_entry_block(dat, vinfo->vi_vblocknr, |
a17564f5 KS |
403 | 0, &entry_bh); |
404 | if (ret < 0) | |
405 | return ret; | |
406 | kaddr = kmap_atomic(entry_bh->b_page, KM_USER0); | |
407 | /* last virtual block number in this block */ | |
003ff182 | 408 | first = vinfo->vi_vblocknr; |
a17564f5 KS |
409 | do_div(first, entries_per_block); |
410 | first *= entries_per_block; | |
411 | last = first + entries_per_block - 1; | |
412 | for (j = i, n = 0; | |
003ff182 RK |
413 | j < nvi && vinfo->vi_vblocknr >= first && |
414 | vinfo->vi_vblocknr <= last; | |
415 | j++, n++, vinfo = (void *)vinfo + visz) { | |
a17564f5 | 416 | entry = nilfs_palloc_block_get_entry( |
003ff182 RK |
417 | dat, vinfo->vi_vblocknr, entry_bh, kaddr); |
418 | vinfo->vi_start = le64_to_cpu(entry->de_start); | |
419 | vinfo->vi_end = le64_to_cpu(entry->de_end); | |
420 | vinfo->vi_blocknr = le64_to_cpu(entry->de_blocknr); | |
a17564f5 KS |
421 | } |
422 | kunmap_atomic(kaddr, KM_USER0); | |
423 | brelse(entry_bh); | |
424 | } | |
425 | ||
426 | return nvi; | |
427 | } | |
79739565 | 428 | |
8707df38 RK |
429 | /** |
430 | * nilfs_dat_read - read dat inode | |
431 | * @dat: dat inode | |
432 | * @raw_inode: on-disk dat inode | |
433 | */ | |
434 | int nilfs_dat_read(struct inode *dat, struct nilfs_inode *raw_inode) | |
435 | { | |
436 | return nilfs_read_inode_common(dat, raw_inode); | |
437 | } | |
438 | ||
79739565 RK |
439 | /** |
440 | * nilfs_dat_new - create dat file | |
441 | * @nilfs: nilfs object | |
442 | * @entry_size: size of a dat entry | |
443 | */ | |
444 | struct inode *nilfs_dat_new(struct the_nilfs *nilfs, size_t entry_size) | |
445 | { | |
446 | static struct lock_class_key dat_lock_key; | |
447 | struct inode *dat; | |
448 | int err; | |
449 | ||
450 | dat = nilfs_mdt_new(nilfs, NULL, NILFS_DAT_INO, 0); | |
451 | if (dat) { | |
452 | err = nilfs_palloc_init_blockgroup(dat, entry_size); | |
453 | if (unlikely(err)) { | |
454 | nilfs_mdt_destroy(dat); | |
455 | return NULL; | |
456 | } | |
457 | lockdep_set_class(&NILFS_MDT(dat)->mi_sem, &dat_lock_key); | |
458 | } | |
459 | return dat; | |
460 | } |