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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 | ||
112 | void nilfs_dat_abort_free(struct inode *dat, struct nilfs_palloc_req *req) | |
113 | { | |
114 | nilfs_dat_abort_entry(dat, req); | |
115 | nilfs_palloc_abort_free_entry(dat, req); | |
116 | } | |
117 | ||
118 | int nilfs_dat_prepare_start(struct inode *dat, struct nilfs_palloc_req *req) | |
119 | { | |
120 | int ret; | |
121 | ||
122 | ret = nilfs_dat_prepare_entry(dat, req, 0); | |
1f5abe7e | 123 | WARN_ON(ret == -ENOENT); |
a17564f5 KS |
124 | return ret; |
125 | } | |
126 | ||
127 | void nilfs_dat_commit_start(struct inode *dat, struct nilfs_palloc_req *req, | |
128 | sector_t blocknr) | |
129 | { | |
130 | struct nilfs_dat_entry *entry; | |
131 | void *kaddr; | |
132 | ||
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)); | |
a17564f5 KS |
137 | entry->de_blocknr = cpu_to_le64(blocknr); |
138 | kunmap_atomic(kaddr, KM_USER0); | |
139 | ||
140 | nilfs_dat_commit_entry(dat, req); | |
141 | } | |
142 | ||
143 | void nilfs_dat_abort_start(struct inode *dat, struct nilfs_palloc_req *req) | |
144 | { | |
145 | nilfs_dat_abort_entry(dat, req); | |
146 | } | |
147 | ||
148 | int nilfs_dat_prepare_end(struct inode *dat, struct nilfs_palloc_req *req) | |
149 | { | |
150 | struct nilfs_dat_entry *entry; | |
151 | __u64 start; | |
152 | sector_t blocknr; | |
153 | void *kaddr; | |
154 | int ret; | |
155 | ||
156 | ret = nilfs_dat_prepare_entry(dat, req, 0); | |
157 | if (ret < 0) { | |
1f5abe7e | 158 | WARN_ON(ret == -ENOENT); |
a17564f5 KS |
159 | return ret; |
160 | } | |
161 | ||
162 | kaddr = kmap_atomic(req->pr_entry_bh->b_page, KM_USER0); | |
163 | entry = nilfs_palloc_block_get_entry(dat, req->pr_entry_nr, | |
164 | req->pr_entry_bh, kaddr); | |
165 | start = le64_to_cpu(entry->de_start); | |
166 | blocknr = le64_to_cpu(entry->de_blocknr); | |
167 | kunmap_atomic(kaddr, KM_USER0); | |
168 | ||
169 | if (blocknr == 0) { | |
170 | ret = nilfs_palloc_prepare_free_entry(dat, req); | |
171 | if (ret < 0) { | |
172 | nilfs_dat_abort_entry(dat, req); | |
173 | return ret; | |
174 | } | |
175 | } | |
176 | ||
177 | return 0; | |
178 | } | |
179 | ||
180 | void nilfs_dat_commit_end(struct inode *dat, struct nilfs_palloc_req *req, | |
181 | int dead) | |
182 | { | |
183 | struct nilfs_dat_entry *entry; | |
184 | __u64 start, end; | |
185 | sector_t blocknr; | |
186 | void *kaddr; | |
187 | ||
188 | kaddr = kmap_atomic(req->pr_entry_bh->b_page, KM_USER0); | |
189 | entry = nilfs_palloc_block_get_entry(dat, req->pr_entry_nr, | |
190 | req->pr_entry_bh, kaddr); | |
191 | end = start = le64_to_cpu(entry->de_start); | |
192 | if (!dead) { | |
193 | end = nilfs_mdt_cno(dat); | |
1f5abe7e | 194 | WARN_ON(start > end); |
a17564f5 KS |
195 | } |
196 | entry->de_end = cpu_to_le64(end); | |
197 | blocknr = le64_to_cpu(entry->de_blocknr); | |
198 | kunmap_atomic(kaddr, KM_USER0); | |
199 | ||
200 | if (blocknr == 0) | |
201 | nilfs_dat_commit_free(dat, req); | |
202 | else | |
203 | nilfs_dat_commit_entry(dat, req); | |
204 | } | |
205 | ||
206 | void nilfs_dat_abort_end(struct inode *dat, struct nilfs_palloc_req *req) | |
207 | { | |
208 | struct nilfs_dat_entry *entry; | |
209 | __u64 start; | |
210 | sector_t blocknr; | |
211 | void *kaddr; | |
212 | ||
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 | start = le64_to_cpu(entry->de_start); | |
217 | blocknr = le64_to_cpu(entry->de_blocknr); | |
218 | kunmap_atomic(kaddr, KM_USER0); | |
219 | ||
220 | if (start == nilfs_mdt_cno(dat) && blocknr == 0) | |
221 | nilfs_palloc_abort_free_entry(dat, req); | |
222 | nilfs_dat_abort_entry(dat, req); | |
223 | } | |
224 | ||
225 | /** | |
226 | * nilfs_dat_mark_dirty - | |
227 | * @dat: DAT file inode | |
228 | * @vblocknr: virtual block number | |
229 | * | |
230 | * Description: | |
231 | * | |
232 | * Return Value: On success, 0 is returned. On error, one of the following | |
233 | * negative error codes is returned. | |
234 | * | |
235 | * %-EIO - I/O error. | |
236 | * | |
237 | * %-ENOMEM - Insufficient amount of memory available. | |
238 | */ | |
239 | int nilfs_dat_mark_dirty(struct inode *dat, __u64 vblocknr) | |
240 | { | |
241 | struct nilfs_palloc_req req; | |
242 | int ret; | |
243 | ||
244 | req.pr_entry_nr = vblocknr; | |
245 | ret = nilfs_dat_prepare_entry(dat, &req, 0); | |
246 | if (ret == 0) | |
247 | nilfs_dat_commit_entry(dat, &req); | |
248 | return ret; | |
249 | } | |
250 | ||
251 | /** | |
252 | * nilfs_dat_freev - free virtual block numbers | |
253 | * @dat: DAT file inode | |
254 | * @vblocknrs: array of virtual block numbers | |
255 | * @nitems: number of virtual block numbers | |
256 | * | |
257 | * Description: nilfs_dat_freev() frees the virtual block numbers specified by | |
258 | * @vblocknrs and @nitems. | |
259 | * | |
260 | * Return Value: On success, 0 is returned. On error, one of the following | |
261 | * nagative error codes is returned. | |
262 | * | |
263 | * %-EIO - I/O error. | |
264 | * | |
265 | * %-ENOMEM - Insufficient amount of memory available. | |
266 | * | |
267 | * %-ENOENT - The virtual block number have not been allocated. | |
268 | */ | |
269 | int nilfs_dat_freev(struct inode *dat, __u64 *vblocknrs, size_t nitems) | |
270 | { | |
271 | return nilfs_palloc_freev(dat, vblocknrs, nitems); | |
272 | } | |
273 | ||
274 | /** | |
275 | * nilfs_dat_move - change a block number | |
276 | * @dat: DAT file inode | |
277 | * @vblocknr: virtual block number | |
278 | * @blocknr: block number | |
279 | * | |
280 | * Description: nilfs_dat_move() changes the block number associated with | |
281 | * @vblocknr to @blocknr. | |
282 | * | |
283 | * Return Value: On success, 0 is returned. On error, one of the following | |
284 | * negative error codes is returned. | |
285 | * | |
286 | * %-EIO - I/O error. | |
287 | * | |
288 | * %-ENOMEM - Insufficient amount of memory available. | |
289 | */ | |
290 | int nilfs_dat_move(struct inode *dat, __u64 vblocknr, sector_t blocknr) | |
291 | { | |
292 | struct buffer_head *entry_bh; | |
293 | struct nilfs_dat_entry *entry; | |
294 | void *kaddr; | |
295 | int ret; | |
296 | ||
297 | ret = nilfs_palloc_get_entry_block(dat, vblocknr, 0, &entry_bh); | |
298 | if (ret < 0) | |
299 | return ret; | |
300 | kaddr = kmap_atomic(entry_bh->b_page, KM_USER0); | |
301 | entry = nilfs_palloc_block_get_entry(dat, vblocknr, entry_bh, kaddr); | |
1f5abe7e | 302 | if (unlikely(entry->de_blocknr == cpu_to_le64(0))) { |
a17564f5 KS |
303 | printk(KERN_CRIT "%s: vbn = %llu, [%llu, %llu)\n", __func__, |
304 | (unsigned long long)vblocknr, | |
305 | (unsigned long long)le64_to_cpu(entry->de_start), | |
306 | (unsigned long long)le64_to_cpu(entry->de_end)); | |
1f5abe7e RK |
307 | kunmap_atomic(kaddr, KM_USER0); |
308 | brelse(entry_bh); | |
309 | return -EINVAL; | |
a17564f5 | 310 | } |
1f5abe7e | 311 | WARN_ON(blocknr == 0); |
a17564f5 KS |
312 | entry->de_blocknr = cpu_to_le64(blocknr); |
313 | kunmap_atomic(kaddr, KM_USER0); | |
314 | ||
315 | nilfs_mdt_mark_buffer_dirty(entry_bh); | |
316 | nilfs_mdt_mark_dirty(dat); | |
317 | ||
318 | brelse(entry_bh); | |
319 | ||
320 | return 0; | |
321 | } | |
322 | ||
323 | /** | |
324 | * nilfs_dat_translate - translate a virtual block number to a block number | |
325 | * @dat: DAT file inode | |
326 | * @vblocknr: virtual block number | |
327 | * @blocknrp: pointer to a block number | |
328 | * | |
329 | * Description: nilfs_dat_translate() maps the virtual block number @vblocknr | |
330 | * to the corresponding block number. | |
331 | * | |
332 | * Return Value: On success, 0 is returned and the block number associated | |
333 | * with @vblocknr is stored in the place pointed by @blocknrp. On error, one | |
334 | * of the following negative error codes is returned. | |
335 | * | |
336 | * %-EIO - I/O error. | |
337 | * | |
338 | * %-ENOMEM - Insufficient amount of memory available. | |
339 | * | |
340 | * %-ENOENT - A block number associated with @vblocknr does not exist. | |
341 | */ | |
342 | int nilfs_dat_translate(struct inode *dat, __u64 vblocknr, sector_t *blocknrp) | |
343 | { | |
344 | struct buffer_head *entry_bh; | |
345 | struct nilfs_dat_entry *entry; | |
346 | sector_t blocknr; | |
347 | void *kaddr; | |
348 | int ret; | |
349 | ||
350 | ret = nilfs_palloc_get_entry_block(dat, vblocknr, 0, &entry_bh); | |
351 | if (ret < 0) | |
352 | return ret; | |
353 | ||
354 | kaddr = kmap_atomic(entry_bh->b_page, KM_USER0); | |
355 | entry = nilfs_palloc_block_get_entry(dat, vblocknr, entry_bh, kaddr); | |
356 | blocknr = le64_to_cpu(entry->de_blocknr); | |
357 | if (blocknr == 0) { | |
358 | ret = -ENOENT; | |
359 | goto out; | |
360 | } | |
361 | if (blocknrp != NULL) | |
362 | *blocknrp = blocknr; | |
363 | ||
364 | out: | |
365 | kunmap_atomic(kaddr, KM_USER0); | |
366 | brelse(entry_bh); | |
367 | return ret; | |
368 | } | |
369 | ||
003ff182 | 370 | ssize_t nilfs_dat_get_vinfo(struct inode *dat, void *buf, unsigned visz, |
a17564f5 KS |
371 | size_t nvi) |
372 | { | |
373 | struct buffer_head *entry_bh; | |
374 | struct nilfs_dat_entry *entry; | |
003ff182 | 375 | struct nilfs_vinfo *vinfo = buf; |
a17564f5 KS |
376 | __u64 first, last; |
377 | void *kaddr; | |
378 | unsigned long entries_per_block = NILFS_MDT(dat)->mi_entries_per_block; | |
379 | int i, j, n, ret; | |
380 | ||
381 | for (i = 0; i < nvi; i += n) { | |
003ff182 | 382 | ret = nilfs_palloc_get_entry_block(dat, vinfo->vi_vblocknr, |
a17564f5 KS |
383 | 0, &entry_bh); |
384 | if (ret < 0) | |
385 | return ret; | |
386 | kaddr = kmap_atomic(entry_bh->b_page, KM_USER0); | |
387 | /* last virtual block number in this block */ | |
003ff182 | 388 | first = vinfo->vi_vblocknr; |
a17564f5 KS |
389 | do_div(first, entries_per_block); |
390 | first *= entries_per_block; | |
391 | last = first + entries_per_block - 1; | |
392 | for (j = i, n = 0; | |
003ff182 RK |
393 | j < nvi && vinfo->vi_vblocknr >= first && |
394 | vinfo->vi_vblocknr <= last; | |
395 | j++, n++, vinfo = (void *)vinfo + visz) { | |
a17564f5 | 396 | entry = nilfs_palloc_block_get_entry( |
003ff182 RK |
397 | dat, vinfo->vi_vblocknr, entry_bh, kaddr); |
398 | vinfo->vi_start = le64_to_cpu(entry->de_start); | |
399 | vinfo->vi_end = le64_to_cpu(entry->de_end); | |
400 | vinfo->vi_blocknr = le64_to_cpu(entry->de_blocknr); | |
a17564f5 KS |
401 | } |
402 | kunmap_atomic(kaddr, KM_USER0); | |
403 | brelse(entry_bh); | |
404 | } | |
405 | ||
406 | return nvi; | |
407 | } |