1 // SPDX-License-Identifier: GPL-2.0+
2 /*
3 * dat.c - NILFS disk address translation.
4 *
5 * Copyright (C) 2006-2008 Nippon Telegraph and Telephone Corporation.
6 *
7 * Written by Koji Sato.
8 */
9
10 #include <linux/types.h>
11 #include <linux/buffer_head.h>
12 #include <linux/string.h>
13 #include <linux/errno.h>
14 #include "nilfs.h"
15 #include "mdt.h"
16 #include "alloc.h"
17 #include "dat.h"
18
19
20 #define NILFS_CNO_MIN ((__u64)1)
21 #define NILFS_CNO_MAX (~(__u64)0)
22
23 /**
24 * struct nilfs_dat_info - on-memory private data of DAT file
25 * @mi: on-memory private data of metadata file
26 * @palloc_cache: persistent object allocator cache of DAT file
27 * @shadow: shadow map of DAT file
28 */
29 struct nilfs_dat_info {
30 struct nilfs_mdt_info mi;
31 struct nilfs_palloc_cache palloc_cache;
32 struct nilfs_shadow_map shadow;
33 };
34
NILFS_DAT_I(struct inode * dat)35 static inline struct nilfs_dat_info *NILFS_DAT_I(struct inode *dat)
36 {
37 return (struct nilfs_dat_info *)NILFS_MDT(dat);
38 }
39
nilfs_dat_prepare_entry(struct inode * dat,struct nilfs_palloc_req * req,int create)40 static int nilfs_dat_prepare_entry(struct inode *dat,
41 struct nilfs_palloc_req *req, int create)
42 {
43 return nilfs_palloc_get_entry_block(dat, req->pr_entry_nr,
44 create, &req->pr_entry_bh);
45 }
46
nilfs_dat_commit_entry(struct inode * dat,struct nilfs_palloc_req * req)47 static void nilfs_dat_commit_entry(struct inode *dat,
48 struct nilfs_palloc_req *req)
49 {
50 mark_buffer_dirty(req->pr_entry_bh);
51 nilfs_mdt_mark_dirty(dat);
52 brelse(req->pr_entry_bh);
53 }
54
nilfs_dat_abort_entry(struct inode * dat,struct nilfs_palloc_req * req)55 static void nilfs_dat_abort_entry(struct inode *dat,
56 struct nilfs_palloc_req *req)
57 {
58 brelse(req->pr_entry_bh);
59 }
60
nilfs_dat_prepare_alloc(struct inode * dat,struct nilfs_palloc_req * req)61 int nilfs_dat_prepare_alloc(struct inode *dat, struct nilfs_palloc_req *req)
62 {
63 int ret;
64
65 ret = nilfs_palloc_prepare_alloc_entry(dat, req);
66 if (ret < 0)
67 return ret;
68
69 ret = nilfs_dat_prepare_entry(dat, req, 1);
70 if (ret < 0)
71 nilfs_palloc_abort_alloc_entry(dat, req);
72
73 return ret;
74 }
75
nilfs_dat_commit_alloc(struct inode * dat,struct nilfs_palloc_req * req)76 void nilfs_dat_commit_alloc(struct inode *dat, struct nilfs_palloc_req *req)
77 {
78 struct nilfs_dat_entry *entry;
79 void *kaddr;
80
81 kaddr = kmap_atomic(req->pr_entry_bh->b_page);
82 entry = nilfs_palloc_block_get_entry(dat, req->pr_entry_nr,
83 req->pr_entry_bh, kaddr);
84 entry->de_start = cpu_to_le64(NILFS_CNO_MIN);
85 entry->de_end = cpu_to_le64(NILFS_CNO_MAX);
86 entry->de_blocknr = cpu_to_le64(0);
87 kunmap_atomic(kaddr);
88
89 nilfs_palloc_commit_alloc_entry(dat, req);
90 nilfs_dat_commit_entry(dat, req);
91 }
92
nilfs_dat_abort_alloc(struct inode * dat,struct nilfs_palloc_req * req)93 void nilfs_dat_abort_alloc(struct inode *dat, struct nilfs_palloc_req *req)
94 {
95 nilfs_dat_abort_entry(dat, req);
96 nilfs_palloc_abort_alloc_entry(dat, req);
97 }
98
nilfs_dat_commit_free(struct inode * dat,struct nilfs_palloc_req * req)99 static void nilfs_dat_commit_free(struct inode *dat,
100 struct nilfs_palloc_req *req)
101 {
102 struct nilfs_dat_entry *entry;
103 void *kaddr;
104
105 kaddr = kmap_atomic(req->pr_entry_bh->b_page);
106 entry = nilfs_palloc_block_get_entry(dat, req->pr_entry_nr,
107 req->pr_entry_bh, kaddr);
108 entry->de_start = cpu_to_le64(NILFS_CNO_MIN);
109 entry->de_end = cpu_to_le64(NILFS_CNO_MIN);
110 entry->de_blocknr = cpu_to_le64(0);
111 kunmap_atomic(kaddr);
112
113 nilfs_dat_commit_entry(dat, req);
114 nilfs_palloc_commit_free_entry(dat, req);
115 }
116
nilfs_dat_prepare_start(struct inode * dat,struct nilfs_palloc_req * req)117 int nilfs_dat_prepare_start(struct inode *dat, struct nilfs_palloc_req *req)
118 {
119 int ret;
120
121 ret = nilfs_dat_prepare_entry(dat, req, 0);
122 WARN_ON(ret == -ENOENT);
123 return ret;
124 }
125
nilfs_dat_commit_start(struct inode * dat,struct nilfs_palloc_req * req,sector_t blocknr)126 void nilfs_dat_commit_start(struct inode *dat, struct nilfs_palloc_req *req,
127 sector_t blocknr)
128 {
129 struct nilfs_dat_entry *entry;
130 void *kaddr;
131
132 kaddr = kmap_atomic(req->pr_entry_bh->b_page);
133 entry = nilfs_palloc_block_get_entry(dat, req->pr_entry_nr,
134 req->pr_entry_bh, kaddr);
135 entry->de_start = cpu_to_le64(nilfs_mdt_cno(dat));
136 entry->de_blocknr = cpu_to_le64(blocknr);
137 kunmap_atomic(kaddr);
138
139 nilfs_dat_commit_entry(dat, req);
140 }
141
nilfs_dat_prepare_end(struct inode * dat,struct nilfs_palloc_req * req)142 int nilfs_dat_prepare_end(struct inode *dat, struct nilfs_palloc_req *req)
143 {
144 struct nilfs_dat_entry *entry;
145 sector_t blocknr;
146 void *kaddr;
147 int ret;
148
149 ret = nilfs_dat_prepare_entry(dat, req, 0);
150 if (ret < 0) {
151 WARN_ON(ret == -ENOENT);
152 return ret;
153 }
154
155 kaddr = kmap_atomic(req->pr_entry_bh->b_page);
156 entry = nilfs_palloc_block_get_entry(dat, req->pr_entry_nr,
157 req->pr_entry_bh, kaddr);
158 blocknr = le64_to_cpu(entry->de_blocknr);
159 kunmap_atomic(kaddr);
160
161 if (blocknr == 0) {
162 ret = nilfs_palloc_prepare_free_entry(dat, req);
163 if (ret < 0) {
164 nilfs_dat_abort_entry(dat, req);
165 return ret;
166 }
167 }
168
169 return 0;
170 }
171
nilfs_dat_commit_end(struct inode * dat,struct nilfs_palloc_req * req,int dead)172 void nilfs_dat_commit_end(struct inode *dat, struct nilfs_palloc_req *req,
173 int dead)
174 {
175 struct nilfs_dat_entry *entry;
176 __u64 start, end;
177 sector_t blocknr;
178 void *kaddr;
179
180 kaddr = kmap_atomic(req->pr_entry_bh->b_page);
181 entry = nilfs_palloc_block_get_entry(dat, req->pr_entry_nr,
182 req->pr_entry_bh, kaddr);
183 end = start = le64_to_cpu(entry->de_start);
184 if (!dead) {
185 end = nilfs_mdt_cno(dat);
186 WARN_ON(start > end);
187 }
188 entry->de_end = cpu_to_le64(end);
189 blocknr = le64_to_cpu(entry->de_blocknr);
190 kunmap_atomic(kaddr);
191
192 if (blocknr == 0)
193 nilfs_dat_commit_free(dat, req);
194 else
195 nilfs_dat_commit_entry(dat, req);
196 }
197
nilfs_dat_abort_end(struct inode * dat,struct nilfs_palloc_req * req)198 void nilfs_dat_abort_end(struct inode *dat, struct nilfs_palloc_req *req)
199 {
200 struct nilfs_dat_entry *entry;
201 __u64 start;
202 sector_t blocknr;
203 void *kaddr;
204
205 kaddr = kmap_atomic(req->pr_entry_bh->b_page);
206 entry = nilfs_palloc_block_get_entry(dat, req->pr_entry_nr,
207 req->pr_entry_bh, kaddr);
208 start = le64_to_cpu(entry->de_start);
209 blocknr = le64_to_cpu(entry->de_blocknr);
210 kunmap_atomic(kaddr);
211
212 if (start == nilfs_mdt_cno(dat) && blocknr == 0)
213 nilfs_palloc_abort_free_entry(dat, req);
214 nilfs_dat_abort_entry(dat, req);
215 }
216
nilfs_dat_prepare_update(struct inode * dat,struct nilfs_palloc_req * oldreq,struct nilfs_palloc_req * newreq)217 int nilfs_dat_prepare_update(struct inode *dat,
218 struct nilfs_palloc_req *oldreq,
219 struct nilfs_palloc_req *newreq)
220 {
221 int ret;
222
223 ret = nilfs_dat_prepare_end(dat, oldreq);
224 if (!ret) {
225 ret = nilfs_dat_prepare_alloc(dat, newreq);
226 if (ret < 0)
227 nilfs_dat_abort_end(dat, oldreq);
228 }
229 return ret;
230 }
231
nilfs_dat_commit_update(struct inode * dat,struct nilfs_palloc_req * oldreq,struct nilfs_palloc_req * newreq,int dead)232 void nilfs_dat_commit_update(struct inode *dat,
233 struct nilfs_palloc_req *oldreq,
234 struct nilfs_palloc_req *newreq, int dead)
235 {
236 nilfs_dat_commit_end(dat, oldreq, dead);
237 nilfs_dat_commit_alloc(dat, newreq);
238 }
239
nilfs_dat_abort_update(struct inode * dat,struct nilfs_palloc_req * oldreq,struct nilfs_palloc_req * newreq)240 void nilfs_dat_abort_update(struct inode *dat,
241 struct nilfs_palloc_req *oldreq,
242 struct nilfs_palloc_req *newreq)
243 {
244 nilfs_dat_abort_end(dat, oldreq);
245 nilfs_dat_abort_alloc(dat, newreq);
246 }
247
248 /**
249 * nilfs_dat_mark_dirty -
250 * @dat: DAT file inode
251 * @vblocknr: virtual block number
252 *
253 * Description:
254 *
255 * Return Value: On success, 0 is returned. On error, one of the following
256 * negative error codes is returned.
257 *
258 * %-EIO - I/O error.
259 *
260 * %-ENOMEM - Insufficient amount of memory available.
261 */
nilfs_dat_mark_dirty(struct inode * dat,__u64 vblocknr)262 int nilfs_dat_mark_dirty(struct inode *dat, __u64 vblocknr)
263 {
264 struct nilfs_palloc_req req;
265 int ret;
266
267 req.pr_entry_nr = vblocknr;
268 ret = nilfs_dat_prepare_entry(dat, &req, 0);
269 if (ret == 0)
270 nilfs_dat_commit_entry(dat, &req);
271 return ret;
272 }
273
274 /**
275 * nilfs_dat_freev - free virtual block numbers
276 * @dat: DAT file inode
277 * @vblocknrs: array of virtual block numbers
278 * @nitems: number of virtual block numbers
279 *
280 * Description: nilfs_dat_freev() frees the virtual block numbers specified by
281 * @vblocknrs and @nitems.
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 * %-ENOENT - The virtual block number have not been allocated.
291 */
nilfs_dat_freev(struct inode * dat,__u64 * vblocknrs,size_t nitems)292 int nilfs_dat_freev(struct inode *dat, __u64 *vblocknrs, size_t nitems)
293 {
294 return nilfs_palloc_freev(dat, vblocknrs, nitems);
295 }
296
297 /**
298 * nilfs_dat_move - change a block number
299 * @dat: DAT file inode
300 * @vblocknr: virtual block number
301 * @blocknr: block number
302 *
303 * Description: nilfs_dat_move() changes the block number associated with
304 * @vblocknr to @blocknr.
305 *
306 * Return Value: On success, 0 is returned. On error, one of the following
307 * negative error codes is returned.
308 *
309 * %-EIO - I/O error.
310 *
311 * %-ENOMEM - Insufficient amount of memory available.
312 */
nilfs_dat_move(struct inode * dat,__u64 vblocknr,sector_t blocknr)313 int nilfs_dat_move(struct inode *dat, __u64 vblocknr, sector_t blocknr)
314 {
315 struct buffer_head *entry_bh;
316 struct nilfs_dat_entry *entry;
317 void *kaddr;
318 int ret;
319
320 ret = nilfs_palloc_get_entry_block(dat, vblocknr, 0, &entry_bh);
321 if (ret < 0)
322 return ret;
323
324 /*
325 * The given disk block number (blocknr) is not yet written to
326 * the device at this point.
327 *
328 * To prevent nilfs_dat_translate() from returning the
329 * uncommitted block number, this makes a copy of the entry
330 * buffer and redirects nilfs_dat_translate() to the copy.
331 */
332 if (!buffer_nilfs_redirected(entry_bh)) {
333 ret = nilfs_mdt_freeze_buffer(dat, entry_bh);
334 if (ret) {
335 brelse(entry_bh);
336 return ret;
337 }
338 }
339
340 kaddr = kmap_atomic(entry_bh->b_page);
341 entry = nilfs_palloc_block_get_entry(dat, vblocknr, entry_bh, kaddr);
342 if (unlikely(entry->de_blocknr == cpu_to_le64(0))) {
343 nilfs_msg(dat->i_sb, KERN_CRIT,
344 "%s: invalid vblocknr = %llu, [%llu, %llu)",
345 __func__, (unsigned long long)vblocknr,
346 (unsigned long long)le64_to_cpu(entry->de_start),
347 (unsigned long long)le64_to_cpu(entry->de_end));
348 kunmap_atomic(kaddr);
349 brelse(entry_bh);
350 return -EINVAL;
351 }
352 WARN_ON(blocknr == 0);
353 entry->de_blocknr = cpu_to_le64(blocknr);
354 kunmap_atomic(kaddr);
355
356 mark_buffer_dirty(entry_bh);
357 nilfs_mdt_mark_dirty(dat);
358
359 brelse(entry_bh);
360
361 return 0;
362 }
363
364 /**
365 * nilfs_dat_translate - translate a virtual block number to a block number
366 * @dat: DAT file inode
367 * @vblocknr: virtual block number
368 * @blocknrp: pointer to a block number
369 *
370 * Description: nilfs_dat_translate() maps the virtual block number @vblocknr
371 * to the corresponding block number.
372 *
373 * Return Value: On success, 0 is returned and the block number associated
374 * with @vblocknr is stored in the place pointed by @blocknrp. On error, one
375 * of the following negative error codes is returned.
376 *
377 * %-EIO - I/O error.
378 *
379 * %-ENOMEM - Insufficient amount of memory available.
380 *
381 * %-ENOENT - A block number associated with @vblocknr does not exist.
382 */
nilfs_dat_translate(struct inode * dat,__u64 vblocknr,sector_t * blocknrp)383 int nilfs_dat_translate(struct inode *dat, __u64 vblocknr, sector_t *blocknrp)
384 {
385 struct buffer_head *entry_bh, *bh;
386 struct nilfs_dat_entry *entry;
387 sector_t blocknr;
388 void *kaddr;
389 int ret;
390
391 ret = nilfs_palloc_get_entry_block(dat, vblocknr, 0, &entry_bh);
392 if (ret < 0)
393 return ret;
394
395 if (!nilfs_doing_gc() && buffer_nilfs_redirected(entry_bh)) {
396 bh = nilfs_mdt_get_frozen_buffer(dat, entry_bh);
397 if (bh) {
398 WARN_ON(!buffer_uptodate(bh));
399 brelse(entry_bh);
400 entry_bh = bh;
401 }
402 }
403
404 kaddr = kmap_atomic(entry_bh->b_page);
405 entry = nilfs_palloc_block_get_entry(dat, vblocknr, entry_bh, kaddr);
406 blocknr = le64_to_cpu(entry->de_blocknr);
407 if (blocknr == 0) {
408 ret = -ENOENT;
409 goto out;
410 }
411 *blocknrp = blocknr;
412
413 out:
414 kunmap_atomic(kaddr);
415 brelse(entry_bh);
416 return ret;
417 }
418
nilfs_dat_get_vinfo(struct inode * dat,void * buf,unsigned int visz,size_t nvi)419 ssize_t nilfs_dat_get_vinfo(struct inode *dat, void *buf, unsigned int visz,
420 size_t nvi)
421 {
422 struct buffer_head *entry_bh;
423 struct nilfs_dat_entry *entry;
424 struct nilfs_vinfo *vinfo = buf;
425 __u64 first, last;
426 void *kaddr;
427 unsigned long entries_per_block = NILFS_MDT(dat)->mi_entries_per_block;
428 int i, j, n, ret;
429
430 for (i = 0; i < nvi; i += n) {
431 ret = nilfs_palloc_get_entry_block(dat, vinfo->vi_vblocknr,
432 0, &entry_bh);
433 if (ret < 0)
434 return ret;
435 kaddr = kmap_atomic(entry_bh->b_page);
436 /* last virtual block number in this block */
437 first = vinfo->vi_vblocknr;
438 do_div(first, entries_per_block);
439 first *= entries_per_block;
440 last = first + entries_per_block - 1;
441 for (j = i, n = 0;
442 j < nvi && vinfo->vi_vblocknr >= first &&
443 vinfo->vi_vblocknr <= last;
444 j++, n++, vinfo = (void *)vinfo + visz) {
445 entry = nilfs_palloc_block_get_entry(
446 dat, vinfo->vi_vblocknr, entry_bh, kaddr);
447 vinfo->vi_start = le64_to_cpu(entry->de_start);
448 vinfo->vi_end = le64_to_cpu(entry->de_end);
449 vinfo->vi_blocknr = le64_to_cpu(entry->de_blocknr);
450 }
451 kunmap_atomic(kaddr);
452 brelse(entry_bh);
453 }
454
455 return nvi;
456 }
457
458 /**
459 * nilfs_dat_read - read or get dat inode
460 * @sb: super block instance
461 * @entry_size: size of a dat entry
462 * @raw_inode: on-disk dat inode
463 * @inodep: buffer to store the inode
464 */
nilfs_dat_read(struct super_block * sb,size_t entry_size,struct nilfs_inode * raw_inode,struct inode ** inodep)465 int nilfs_dat_read(struct super_block *sb, size_t entry_size,
466 struct nilfs_inode *raw_inode, struct inode **inodep)
467 {
468 static struct lock_class_key dat_lock_key;
469 struct inode *dat;
470 struct nilfs_dat_info *di;
471 int err;
472
473 if (entry_size > sb->s_blocksize) {
474 nilfs_msg(sb, KERN_ERR, "too large DAT entry size: %zu bytes",
475 entry_size);
476 return -EINVAL;
477 } else if (entry_size < NILFS_MIN_DAT_ENTRY_SIZE) {
478 nilfs_msg(sb, KERN_ERR, "too small DAT entry size: %zu bytes",
479 entry_size);
480 return -EINVAL;
481 }
482
483 dat = nilfs_iget_locked(sb, NULL, NILFS_DAT_INO);
484 if (unlikely(!dat))
485 return -ENOMEM;
486 if (!(dat->i_state & I_NEW))
487 goto out;
488
489 err = nilfs_mdt_init(dat, NILFS_MDT_GFP, sizeof(*di));
490 if (err)
491 goto failed;
492
493 err = nilfs_palloc_init_blockgroup(dat, entry_size);
494 if (err)
495 goto failed;
496
497 di = NILFS_DAT_I(dat);
498 lockdep_set_class(&di->mi.mi_sem, &dat_lock_key);
499 nilfs_palloc_setup_cache(dat, &di->palloc_cache);
500 nilfs_mdt_setup_shadow_map(dat, &di->shadow);
501
502 err = nilfs_read_inode_common(dat, raw_inode);
503 if (err)
504 goto failed;
505
506 unlock_new_inode(dat);
507 out:
508 *inodep = dat;
509 return 0;
510 failed:
511 iget_failed(dat);
512 return err;
513 }
514
