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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 | ||
95 | int nilfs_dat_prepare_free(struct inode *dat, struct nilfs_palloc_req *req) | |
96 | { | |
97 | int ret; | |
98 | ||
99 | ret = nilfs_palloc_prepare_free_entry(dat, req); | |
100 | if (ret < 0) | |
101 | return ret; | |
102 | ret = nilfs_dat_prepare_entry(dat, req, 0); | |
103 | if (ret < 0) { | |
104 | nilfs_palloc_abort_free_entry(dat, req); | |
105 | return ret; | |
106 | } | |
107 | return 0; | |
108 | } | |
109 | ||
110 | void nilfs_dat_commit_free(struct inode *dat, struct nilfs_palloc_req *req) | |
111 | { | |
112 | struct nilfs_dat_entry *entry; | |
113 | void *kaddr; | |
114 | ||
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); | |
122 | ||
123 | nilfs_dat_commit_entry(dat, req); | |
124 | nilfs_palloc_commit_free_entry(dat, req); | |
125 | } | |
126 | ||
127 | void nilfs_dat_abort_free(struct inode *dat, struct nilfs_palloc_req *req) | |
128 | { | |
129 | nilfs_dat_abort_entry(dat, req); | |
130 | nilfs_palloc_abort_free_entry(dat, req); | |
131 | } | |
132 | ||
133 | int nilfs_dat_prepare_start(struct inode *dat, struct nilfs_palloc_req *req) | |
134 | { | |
135 | int ret; | |
136 | ||
137 | ret = nilfs_dat_prepare_entry(dat, req, 0); | |
1f5abe7e | 138 | WARN_ON(ret == -ENOENT); |
a17564f5 KS |
139 | return ret; |
140 | } | |
141 | ||
142 | void nilfs_dat_commit_start(struct inode *dat, struct nilfs_palloc_req *req, | |
143 | sector_t blocknr) | |
144 | { | |
145 | struct nilfs_dat_entry *entry; | |
146 | void *kaddr; | |
147 | ||
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)) { | |
154 | printk(KERN_CRIT | |
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)); | |
a17564f5 KS |
160 | } |
161 | entry->de_blocknr = cpu_to_le64(blocknr); | |
162 | kunmap_atomic(kaddr, KM_USER0); | |
163 | ||
164 | nilfs_dat_commit_entry(dat, req); | |
165 | } | |
166 | ||
167 | void nilfs_dat_abort_start(struct inode *dat, struct nilfs_palloc_req *req) | |
168 | { | |
169 | nilfs_dat_abort_entry(dat, req); | |
170 | } | |
171 | ||
172 | int nilfs_dat_prepare_end(struct inode *dat, struct nilfs_palloc_req *req) | |
173 | { | |
174 | struct nilfs_dat_entry *entry; | |
175 | __u64 start; | |
176 | sector_t blocknr; | |
177 | void *kaddr; | |
178 | int ret; | |
179 | ||
180 | ret = nilfs_dat_prepare_entry(dat, req, 0); | |
181 | if (ret < 0) { | |
1f5abe7e | 182 | WARN_ON(ret == -ENOENT); |
a17564f5 KS |
183 | return ret; |
184 | } | |
185 | ||
186 | kaddr = kmap_atomic(req->pr_entry_bh->b_page, KM_USER0); | |
187 | entry = nilfs_palloc_block_get_entry(dat, req->pr_entry_nr, | |
188 | req->pr_entry_bh, kaddr); | |
189 | start = le64_to_cpu(entry->de_start); | |
190 | blocknr = le64_to_cpu(entry->de_blocknr); | |
191 | kunmap_atomic(kaddr, KM_USER0); | |
192 | ||
193 | if (blocknr == 0) { | |
194 | ret = nilfs_palloc_prepare_free_entry(dat, req); | |
195 | if (ret < 0) { | |
196 | nilfs_dat_abort_entry(dat, req); | |
197 | return ret; | |
198 | } | |
199 | } | |
200 | ||
201 | return 0; | |
202 | } | |
203 | ||
204 | void nilfs_dat_commit_end(struct inode *dat, struct nilfs_palloc_req *req, | |
205 | int dead) | |
206 | { | |
207 | struct nilfs_dat_entry *entry; | |
208 | __u64 start, end; | |
209 | sector_t blocknr; | |
210 | void *kaddr; | |
211 | ||
212 | kaddr = kmap_atomic(req->pr_entry_bh->b_page, KM_USER0); | |
213 | entry = nilfs_palloc_block_get_entry(dat, req->pr_entry_nr, | |
214 | req->pr_entry_bh, kaddr); | |
215 | end = start = le64_to_cpu(entry->de_start); | |
216 | if (!dead) { | |
217 | end = nilfs_mdt_cno(dat); | |
1f5abe7e | 218 | WARN_ON(start > end); |
a17564f5 KS |
219 | } |
220 | entry->de_end = cpu_to_le64(end); | |
221 | blocknr = le64_to_cpu(entry->de_blocknr); | |
222 | kunmap_atomic(kaddr, KM_USER0); | |
223 | ||
224 | if (blocknr == 0) | |
225 | nilfs_dat_commit_free(dat, req); | |
226 | else | |
227 | nilfs_dat_commit_entry(dat, req); | |
228 | } | |
229 | ||
230 | void nilfs_dat_abort_end(struct inode *dat, struct nilfs_palloc_req *req) | |
231 | { | |
232 | struct nilfs_dat_entry *entry; | |
233 | __u64 start; | |
234 | sector_t blocknr; | |
235 | void *kaddr; | |
236 | ||
237 | kaddr = kmap_atomic(req->pr_entry_bh->b_page, KM_USER0); | |
238 | entry = nilfs_palloc_block_get_entry(dat, req->pr_entry_nr, | |
239 | req->pr_entry_bh, kaddr); | |
240 | start = le64_to_cpu(entry->de_start); | |
241 | blocknr = le64_to_cpu(entry->de_blocknr); | |
242 | kunmap_atomic(kaddr, KM_USER0); | |
243 | ||
244 | if (start == nilfs_mdt_cno(dat) && blocknr == 0) | |
245 | nilfs_palloc_abort_free_entry(dat, req); | |
246 | nilfs_dat_abort_entry(dat, req); | |
247 | } | |
248 | ||
249 | /** | |
250 | * nilfs_dat_mark_dirty - | |
251 | * @dat: DAT file inode | |
252 | * @vblocknr: virtual block number | |
253 | * | |
254 | * Description: | |
255 | * | |
256 | * Return Value: On success, 0 is returned. On error, one of the following | |
257 | * negative error codes is returned. | |
258 | * | |
259 | * %-EIO - I/O error. | |
260 | * | |
261 | * %-ENOMEM - Insufficient amount of memory available. | |
262 | */ | |
263 | int nilfs_dat_mark_dirty(struct inode *dat, __u64 vblocknr) | |
264 | { | |
265 | struct nilfs_palloc_req req; | |
266 | int ret; | |
267 | ||
268 | req.pr_entry_nr = vblocknr; | |
269 | ret = nilfs_dat_prepare_entry(dat, &req, 0); | |
270 | if (ret == 0) | |
271 | nilfs_dat_commit_entry(dat, &req); | |
272 | return ret; | |
273 | } | |
274 | ||
275 | /** | |
276 | * nilfs_dat_freev - free virtual block numbers | |
277 | * @dat: DAT file inode | |
278 | * @vblocknrs: array of virtual block numbers | |
279 | * @nitems: number of virtual block numbers | |
280 | * | |
281 | * Description: nilfs_dat_freev() frees the virtual block numbers specified by | |
282 | * @vblocknrs and @nitems. | |
283 | * | |
284 | * Return Value: On success, 0 is returned. On error, one of the following | |
285 | * nagative error codes is returned. | |
286 | * | |
287 | * %-EIO - I/O error. | |
288 | * | |
289 | * %-ENOMEM - Insufficient amount of memory available. | |
290 | * | |
291 | * %-ENOENT - The virtual block number have not been allocated. | |
292 | */ | |
293 | int nilfs_dat_freev(struct inode *dat, __u64 *vblocknrs, size_t nitems) | |
294 | { | |
295 | return nilfs_palloc_freev(dat, vblocknrs, nitems); | |
296 | } | |
297 | ||
298 | /** | |
299 | * nilfs_dat_move - change a block number | |
300 | * @dat: DAT file inode | |
301 | * @vblocknr: virtual block number | |
302 | * @blocknr: block number | |
303 | * | |
304 | * Description: nilfs_dat_move() changes the block number associated with | |
305 | * @vblocknr to @blocknr. | |
306 | * | |
307 | * Return Value: On success, 0 is returned. On error, one of the following | |
308 | * negative error codes is returned. | |
309 | * | |
310 | * %-EIO - I/O error. | |
311 | * | |
312 | * %-ENOMEM - Insufficient amount of memory available. | |
313 | */ | |
314 | int nilfs_dat_move(struct inode *dat, __u64 vblocknr, sector_t blocknr) | |
315 | { | |
316 | struct buffer_head *entry_bh; | |
317 | struct nilfs_dat_entry *entry; | |
318 | void *kaddr; | |
319 | int ret; | |
320 | ||
321 | ret = nilfs_palloc_get_entry_block(dat, vblocknr, 0, &entry_bh); | |
322 | if (ret < 0) | |
323 | return ret; | |
324 | kaddr = kmap_atomic(entry_bh->b_page, KM_USER0); | |
325 | entry = nilfs_palloc_block_get_entry(dat, vblocknr, entry_bh, kaddr); | |
1f5abe7e | 326 | if (unlikely(entry->de_blocknr == cpu_to_le64(0))) { |
a17564f5 KS |
327 | printk(KERN_CRIT "%s: vbn = %llu, [%llu, %llu)\n", __func__, |
328 | (unsigned long long)vblocknr, | |
329 | (unsigned long long)le64_to_cpu(entry->de_start), | |
330 | (unsigned long long)le64_to_cpu(entry->de_end)); | |
1f5abe7e RK |
331 | kunmap_atomic(kaddr, KM_USER0); |
332 | brelse(entry_bh); | |
333 | return -EINVAL; | |
a17564f5 | 334 | } |
1f5abe7e | 335 | WARN_ON(blocknr == 0); |
a17564f5 KS |
336 | entry->de_blocknr = cpu_to_le64(blocknr); |
337 | kunmap_atomic(kaddr, KM_USER0); | |
338 | ||
339 | nilfs_mdt_mark_buffer_dirty(entry_bh); | |
340 | nilfs_mdt_mark_dirty(dat); | |
341 | ||
342 | brelse(entry_bh); | |
343 | ||
344 | return 0; | |
345 | } | |
346 | ||
347 | /** | |
348 | * nilfs_dat_translate - translate a virtual block number to a block number | |
349 | * @dat: DAT file inode | |
350 | * @vblocknr: virtual block number | |
351 | * @blocknrp: pointer to a block number | |
352 | * | |
353 | * Description: nilfs_dat_translate() maps the virtual block number @vblocknr | |
354 | * to the corresponding block number. | |
355 | * | |
356 | * Return Value: On success, 0 is returned and the block number associated | |
357 | * with @vblocknr is stored in the place pointed by @blocknrp. On error, one | |
358 | * of the following negative error codes is returned. | |
359 | * | |
360 | * %-EIO - I/O error. | |
361 | * | |
362 | * %-ENOMEM - Insufficient amount of memory available. | |
363 | * | |
364 | * %-ENOENT - A block number associated with @vblocknr does not exist. | |
365 | */ | |
366 | int nilfs_dat_translate(struct inode *dat, __u64 vblocknr, sector_t *blocknrp) | |
367 | { | |
368 | struct buffer_head *entry_bh; | |
369 | struct nilfs_dat_entry *entry; | |
370 | sector_t blocknr; | |
371 | void *kaddr; | |
372 | int ret; | |
373 | ||
374 | ret = nilfs_palloc_get_entry_block(dat, vblocknr, 0, &entry_bh); | |
375 | if (ret < 0) | |
376 | return ret; | |
377 | ||
378 | kaddr = kmap_atomic(entry_bh->b_page, KM_USER0); | |
379 | entry = nilfs_palloc_block_get_entry(dat, vblocknr, entry_bh, kaddr); | |
380 | blocknr = le64_to_cpu(entry->de_blocknr); | |
381 | if (blocknr == 0) { | |
382 | ret = -ENOENT; | |
383 | goto out; | |
384 | } | |
385 | if (blocknrp != NULL) | |
386 | *blocknrp = blocknr; | |
387 | ||
388 | out: | |
389 | kunmap_atomic(kaddr, KM_USER0); | |
390 | brelse(entry_bh); | |
391 | return ret; | |
392 | } | |
393 | ||
394 | ssize_t nilfs_dat_get_vinfo(struct inode *dat, struct nilfs_vinfo *vinfo, | |
395 | size_t nvi) | |
396 | { | |
397 | struct buffer_head *entry_bh; | |
398 | struct nilfs_dat_entry *entry; | |
399 | __u64 first, last; | |
400 | void *kaddr; | |
401 | unsigned long entries_per_block = NILFS_MDT(dat)->mi_entries_per_block; | |
402 | int i, j, n, ret; | |
403 | ||
404 | for (i = 0; i < nvi; i += n) { | |
405 | ret = nilfs_palloc_get_entry_block(dat, vinfo[i].vi_vblocknr, | |
406 | 0, &entry_bh); | |
407 | if (ret < 0) | |
408 | return ret; | |
409 | kaddr = kmap_atomic(entry_bh->b_page, KM_USER0); | |
410 | /* last virtual block number in this block */ | |
411 | first = vinfo[i].vi_vblocknr; | |
412 | do_div(first, entries_per_block); | |
413 | first *= entries_per_block; | |
414 | last = first + entries_per_block - 1; | |
415 | for (j = i, n = 0; | |
416 | j < nvi && vinfo[j].vi_vblocknr >= first && | |
417 | vinfo[j].vi_vblocknr <= last; | |
418 | j++, n++) { | |
419 | entry = nilfs_palloc_block_get_entry( | |
420 | dat, vinfo[j].vi_vblocknr, entry_bh, kaddr); | |
421 | vinfo[j].vi_start = le64_to_cpu(entry->de_start); | |
422 | vinfo[j].vi_end = le64_to_cpu(entry->de_end); | |
423 | vinfo[j].vi_blocknr = le64_to_cpu(entry->de_blocknr); | |
424 | } | |
425 | kunmap_atomic(kaddr, KM_USER0); | |
426 | brelse(entry_bh); | |
427 | } | |
428 | ||
429 | return nvi; | |
430 | } |