1 // SPDX-License-Identifier: GPL-2.0+
3 * dat.c - NILFS disk address translation.
5 * Copyright (C) 2006-2008 Nippon Telegraph and Telephone Corporation.
7 * Written by Koji Sato.
10 #include <linux/types.h>
11 #include <linux/buffer_head.h>
12 #include <linux/string.h>
13 #include <linux/errno.h>
20 #define NILFS_CNO_MIN ((__u64)1)
21 #define NILFS_CNO_MAX (~(__u64)0)
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
29 struct nilfs_dat_info {
30 struct nilfs_mdt_info mi;
31 struct nilfs_palloc_cache palloc_cache;
32 struct nilfs_shadow_map shadow;
35 static inline struct nilfs_dat_info *NILFS_DAT_I(struct inode *dat)
37 return (struct nilfs_dat_info *)NILFS_MDT(dat);
40 static int nilfs_dat_prepare_entry(struct inode *dat,
41 struct nilfs_palloc_req *req, int create)
43 return nilfs_palloc_get_entry_block(dat, req->pr_entry_nr,
44 create, &req->pr_entry_bh);
47 static void nilfs_dat_commit_entry(struct inode *dat,
48 struct nilfs_palloc_req *req)
50 mark_buffer_dirty(req->pr_entry_bh);
51 nilfs_mdt_mark_dirty(dat);
52 brelse(req->pr_entry_bh);
55 static void nilfs_dat_abort_entry(struct inode *dat,
56 struct nilfs_palloc_req *req)
58 brelse(req->pr_entry_bh);
61 int nilfs_dat_prepare_alloc(struct inode *dat, struct nilfs_palloc_req *req)
65 ret = nilfs_palloc_prepare_alloc_entry(dat, req);
69 ret = nilfs_dat_prepare_entry(dat, req, 1);
71 nilfs_palloc_abort_alloc_entry(dat, req);
76 void nilfs_dat_commit_alloc(struct inode *dat, struct nilfs_palloc_req *req)
78 struct nilfs_dat_entry *entry;
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);
89 nilfs_palloc_commit_alloc_entry(dat, req);
90 nilfs_dat_commit_entry(dat, req);
93 void nilfs_dat_abort_alloc(struct inode *dat, struct nilfs_palloc_req *req)
95 nilfs_dat_abort_entry(dat, req);
96 nilfs_palloc_abort_alloc_entry(dat, req);
99 static void nilfs_dat_commit_free(struct inode *dat,
100 struct nilfs_palloc_req *req)
102 struct nilfs_dat_entry *entry;
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);
113 nilfs_dat_commit_entry(dat, req);
115 if (unlikely(req->pr_desc_bh == NULL || req->pr_bitmap_bh == NULL)) {
116 nilfs_error(dat->i_sb,
117 "state inconsistency probably due to duplicate use of vblocknr = %llu",
118 (unsigned long long)req->pr_entry_nr);
121 nilfs_palloc_commit_free_entry(dat, req);
124 int nilfs_dat_prepare_start(struct inode *dat, struct nilfs_palloc_req *req)
128 ret = nilfs_dat_prepare_entry(dat, req, 0);
129 WARN_ON(ret == -ENOENT);
133 void nilfs_dat_commit_start(struct inode *dat, struct nilfs_palloc_req *req,
136 struct nilfs_dat_entry *entry;
139 kaddr = kmap_atomic(req->pr_entry_bh->b_page);
140 entry = nilfs_palloc_block_get_entry(dat, req->pr_entry_nr,
141 req->pr_entry_bh, kaddr);
142 entry->de_start = cpu_to_le64(nilfs_mdt_cno(dat));
143 entry->de_blocknr = cpu_to_le64(blocknr);
144 kunmap_atomic(kaddr);
146 nilfs_dat_commit_entry(dat, req);
149 int nilfs_dat_prepare_end(struct inode *dat, struct nilfs_palloc_req *req)
151 struct nilfs_dat_entry *entry;
156 ret = nilfs_dat_prepare_entry(dat, req, 0);
158 WARN_ON(ret == -ENOENT);
162 kaddr = kmap_atomic(req->pr_entry_bh->b_page);
163 entry = nilfs_palloc_block_get_entry(dat, req->pr_entry_nr,
164 req->pr_entry_bh, kaddr);
165 blocknr = le64_to_cpu(entry->de_blocknr);
166 kunmap_atomic(kaddr);
169 ret = nilfs_palloc_prepare_free_entry(dat, req);
171 nilfs_dat_abort_entry(dat, req);
179 void nilfs_dat_commit_end(struct inode *dat, struct nilfs_palloc_req *req,
182 struct nilfs_dat_entry *entry;
187 kaddr = kmap_atomic(req->pr_entry_bh->b_page);
188 entry = nilfs_palloc_block_get_entry(dat, req->pr_entry_nr,
189 req->pr_entry_bh, kaddr);
190 end = start = le64_to_cpu(entry->de_start);
192 end = nilfs_mdt_cno(dat);
193 WARN_ON(start > end);
195 entry->de_end = cpu_to_le64(end);
196 blocknr = le64_to_cpu(entry->de_blocknr);
197 kunmap_atomic(kaddr);
200 nilfs_dat_commit_free(dat, req);
202 nilfs_dat_commit_entry(dat, req);
205 void nilfs_dat_abort_end(struct inode *dat, struct nilfs_palloc_req *req)
207 struct nilfs_dat_entry *entry;
212 kaddr = kmap_atomic(req->pr_entry_bh->b_page);
213 entry = nilfs_palloc_block_get_entry(dat, req->pr_entry_nr,
214 req->pr_entry_bh, kaddr);
215 start = le64_to_cpu(entry->de_start);
216 blocknr = le64_to_cpu(entry->de_blocknr);
217 kunmap_atomic(kaddr);
219 if (start == nilfs_mdt_cno(dat) && blocknr == 0)
220 nilfs_palloc_abort_free_entry(dat, req);
221 nilfs_dat_abort_entry(dat, req);
224 int nilfs_dat_prepare_update(struct inode *dat,
225 struct nilfs_palloc_req *oldreq,
226 struct nilfs_palloc_req *newreq)
230 ret = nilfs_dat_prepare_end(dat, oldreq);
232 ret = nilfs_dat_prepare_alloc(dat, newreq);
234 nilfs_dat_abort_end(dat, oldreq);
239 void nilfs_dat_commit_update(struct inode *dat,
240 struct nilfs_palloc_req *oldreq,
241 struct nilfs_palloc_req *newreq, int dead)
243 nilfs_dat_commit_end(dat, oldreq, dead);
244 nilfs_dat_commit_alloc(dat, newreq);
247 void nilfs_dat_abort_update(struct inode *dat,
248 struct nilfs_palloc_req *oldreq,
249 struct nilfs_palloc_req *newreq)
251 nilfs_dat_abort_end(dat, oldreq);
252 nilfs_dat_abort_alloc(dat, newreq);
256 * nilfs_dat_mark_dirty -
257 * @dat: DAT file inode
258 * @vblocknr: virtual block number
262 * Return Value: On success, 0 is returned. On error, one of the following
263 * negative error codes is returned.
267 * %-ENOMEM - Insufficient amount of memory available.
269 int nilfs_dat_mark_dirty(struct inode *dat, __u64 vblocknr)
271 struct nilfs_palloc_req req;
274 req.pr_entry_nr = vblocknr;
275 ret = nilfs_dat_prepare_entry(dat, &req, 0);
277 nilfs_dat_commit_entry(dat, &req);
282 * nilfs_dat_freev - free virtual block numbers
283 * @dat: DAT file inode
284 * @vblocknrs: array of virtual block numbers
285 * @nitems: number of virtual block numbers
287 * Description: nilfs_dat_freev() frees the virtual block numbers specified by
288 * @vblocknrs and @nitems.
290 * Return Value: On success, 0 is returned. On error, one of the following
291 * negative error codes is returned.
295 * %-ENOMEM - Insufficient amount of memory available.
297 * %-ENOENT - The virtual block number have not been allocated.
299 int nilfs_dat_freev(struct inode *dat, __u64 *vblocknrs, size_t nitems)
301 return nilfs_palloc_freev(dat, vblocknrs, nitems);
305 * nilfs_dat_move - change a block number
306 * @dat: DAT file inode
307 * @vblocknr: virtual block number
308 * @blocknr: block number
310 * Description: nilfs_dat_move() changes the block number associated with
311 * @vblocknr to @blocknr.
313 * Return Value: On success, 0 is returned. On error, one of the following
314 * negative error codes is returned.
318 * %-ENOMEM - Insufficient amount of memory available.
320 int nilfs_dat_move(struct inode *dat, __u64 vblocknr, sector_t blocknr)
322 struct buffer_head *entry_bh;
323 struct nilfs_dat_entry *entry;
327 ret = nilfs_palloc_get_entry_block(dat, vblocknr, 0, &entry_bh);
332 * The given disk block number (blocknr) is not yet written to
333 * the device at this point.
335 * To prevent nilfs_dat_translate() from returning the
336 * uncommitted block number, this makes a copy of the entry
337 * buffer and redirects nilfs_dat_translate() to the copy.
339 if (!buffer_nilfs_redirected(entry_bh)) {
340 ret = nilfs_mdt_freeze_buffer(dat, entry_bh);
347 kaddr = kmap_atomic(entry_bh->b_page);
348 entry = nilfs_palloc_block_get_entry(dat, vblocknr, entry_bh, kaddr);
349 if (unlikely(entry->de_blocknr == cpu_to_le64(0))) {
350 nilfs_msg(dat->i_sb, KERN_CRIT,
351 "%s: invalid vblocknr = %llu, [%llu, %llu)",
352 __func__, (unsigned long long)vblocknr,
353 (unsigned long long)le64_to_cpu(entry->de_start),
354 (unsigned long long)le64_to_cpu(entry->de_end));
355 kunmap_atomic(kaddr);
359 WARN_ON(blocknr == 0);
360 entry->de_blocknr = cpu_to_le64(blocknr);
361 kunmap_atomic(kaddr);
363 mark_buffer_dirty(entry_bh);
364 nilfs_mdt_mark_dirty(dat);
372 * nilfs_dat_translate - translate a virtual block number to a block number
373 * @dat: DAT file inode
374 * @vblocknr: virtual block number
375 * @blocknrp: pointer to a block number
377 * Description: nilfs_dat_translate() maps the virtual block number @vblocknr
378 * to the corresponding block number.
380 * Return Value: On success, 0 is returned and the block number associated
381 * with @vblocknr is stored in the place pointed by @blocknrp. On error, one
382 * of the following negative error codes is returned.
386 * %-ENOMEM - Insufficient amount of memory available.
388 * %-ENOENT - A block number associated with @vblocknr does not exist.
390 int nilfs_dat_translate(struct inode *dat, __u64 vblocknr, sector_t *blocknrp)
392 struct buffer_head *entry_bh, *bh;
393 struct nilfs_dat_entry *entry;
398 ret = nilfs_palloc_get_entry_block(dat, vblocknr, 0, &entry_bh);
402 if (!nilfs_doing_gc() && buffer_nilfs_redirected(entry_bh)) {
403 bh = nilfs_mdt_get_frozen_buffer(dat, entry_bh);
405 WARN_ON(!buffer_uptodate(bh));
411 kaddr = kmap_atomic(entry_bh->b_page);
412 entry = nilfs_palloc_block_get_entry(dat, vblocknr, entry_bh, kaddr);
413 blocknr = le64_to_cpu(entry->de_blocknr);
421 kunmap_atomic(kaddr);
426 ssize_t nilfs_dat_get_vinfo(struct inode *dat, void *buf, unsigned int visz,
429 struct buffer_head *entry_bh;
430 struct nilfs_dat_entry *entry;
431 struct nilfs_vinfo *vinfo = buf;
434 unsigned long entries_per_block = NILFS_MDT(dat)->mi_entries_per_block;
437 for (i = 0; i < nvi; i += n) {
438 ret = nilfs_palloc_get_entry_block(dat, vinfo->vi_vblocknr,
442 kaddr = kmap_atomic(entry_bh->b_page);
443 /* last virtual block number in this block */
444 first = vinfo->vi_vblocknr;
445 do_div(first, entries_per_block);
446 first *= entries_per_block;
447 last = first + entries_per_block - 1;
449 j < nvi && vinfo->vi_vblocknr >= first &&
450 vinfo->vi_vblocknr <= last;
451 j++, n++, vinfo = (void *)vinfo + visz) {
452 entry = nilfs_palloc_block_get_entry(
453 dat, vinfo->vi_vblocknr, entry_bh, kaddr);
454 vinfo->vi_start = le64_to_cpu(entry->de_start);
455 vinfo->vi_end = le64_to_cpu(entry->de_end);
456 vinfo->vi_blocknr = le64_to_cpu(entry->de_blocknr);
458 kunmap_atomic(kaddr);
466 * nilfs_dat_read - read or get dat inode
467 * @sb: super block instance
468 * @entry_size: size of a dat entry
469 * @raw_inode: on-disk dat inode
470 * @inodep: buffer to store the inode
472 int nilfs_dat_read(struct super_block *sb, size_t entry_size,
473 struct nilfs_inode *raw_inode, struct inode **inodep)
475 static struct lock_class_key dat_lock_key;
477 struct nilfs_dat_info *di;
480 if (entry_size > sb->s_blocksize) {
481 nilfs_msg(sb, KERN_ERR, "too large DAT entry size: %zu bytes",
484 } else if (entry_size < NILFS_MIN_DAT_ENTRY_SIZE) {
485 nilfs_msg(sb, KERN_ERR, "too small DAT entry size: %zu bytes",
490 dat = nilfs_iget_locked(sb, NULL, NILFS_DAT_INO);
493 if (!(dat->i_state & I_NEW))
496 err = nilfs_mdt_init(dat, NILFS_MDT_GFP, sizeof(*di));
500 err = nilfs_palloc_init_blockgroup(dat, entry_size);
504 di = NILFS_DAT_I(dat);
505 lockdep_set_class(&di->mi.mi_sem, &dat_lock_key);
506 nilfs_palloc_setup_cache(dat, &di->palloc_cache);
507 err = nilfs_mdt_setup_shadow_map(dat, &di->shadow);
511 err = nilfs_read_inode_common(dat, raw_inode);
515 unlock_new_inode(dat);