summaryrefslogtreecommitdiff
path: root/fs/bcachefs/io_misc.c
blob: 4ec979b4b23e4bcdee6a2dfd1dc3cd3dbfb03024 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
// SPDX-License-Identifier: GPL-2.0
/*
 * io_misc.c - fallocate, fpunch, truncate:
 */

#include "bcachefs.h"
#include "alloc_foreground.h"
#include "bkey_buf.h"
#include "btree_update.h"
#include "buckets.h"
#include "clock.h"
#include "error.h"
#include "extents.h"
#include "extent_update.h"
#include "inode.h"
#include "io_misc.h"
#include "io_write.h"
#include "logged_ops.h"
#include "rebalance.h"
#include "subvolume.h"

/* Overwrites whatever was present with zeroes: */
int bch2_extent_fallocate(struct btree_trans *trans,
			  subvol_inum inum,
			  struct btree_iter *iter,
			  u64 sectors,
			  struct bch_io_opts opts,
			  s64 *i_sectors_delta,
			  struct write_point_specifier write_point)
{
	struct bch_fs *c = trans->c;
	struct disk_reservation disk_res = { 0 };
	struct closure cl;
	struct open_buckets open_buckets = { 0 };
	struct bkey_s_c k;
	struct bkey_buf old, new;
	unsigned sectors_allocated = 0, new_replicas;
	bool unwritten = opts.nocow &&
	    c->sb.version >= bcachefs_metadata_version_unwritten_extents;
	int ret;

	bch2_bkey_buf_init(&old);
	bch2_bkey_buf_init(&new);
	closure_init_stack(&cl);

	k = bch2_btree_iter_peek_slot(iter);
	ret = bkey_err(k);
	if (ret)
		return ret;

	sectors = min_t(u64, sectors, k.k->p.offset - iter->pos.offset);
	new_replicas = max(0, (int) opts.data_replicas -
			   (int) bch2_bkey_nr_ptrs_fully_allocated(k));

	/*
	 * Get a disk reservation before (in the nocow case) calling
	 * into the allocator:
	 */
	ret = bch2_disk_reservation_get(c, &disk_res, sectors, new_replicas, 0);
	if (unlikely(ret))
		goto err_noprint;

	bch2_bkey_buf_reassemble(&old, c, k);

	if (!unwritten) {
		struct bkey_i_reservation *reservation;

		bch2_bkey_buf_realloc(&new, c, sizeof(*reservation) / sizeof(u64));
		reservation = bkey_reservation_init(new.k);
		reservation->k.p = iter->pos;
		bch2_key_resize(&reservation->k, sectors);
		reservation->v.nr_replicas = opts.data_replicas;
	} else {
		struct bkey_i_extent *e;
		struct bch_devs_list devs_have;
		struct write_point *wp;

		devs_have.nr = 0;

		bch2_bkey_buf_realloc(&new, c, BKEY_EXTENT_U64s_MAX);

		e = bkey_extent_init(new.k);
		e->k.p = iter->pos;

		ret = bch2_alloc_sectors_start_trans(trans,
				opts.foreground_target,
				false,
				write_point,
				&devs_have,
				opts.data_replicas,
				opts.data_replicas,
				BCH_WATERMARK_normal, 0, &cl, &wp);
		if (bch2_err_matches(ret, BCH_ERR_operation_blocked))
			ret = -BCH_ERR_transaction_restart_nested;
		if (ret)
			goto err;

		sectors = min_t(u64, sectors, wp->sectors_free);
		sectors_allocated = sectors;

		bch2_key_resize(&e->k, sectors);

		bch2_open_bucket_get(c, wp, &open_buckets);
		bch2_alloc_sectors_append_ptrs(c, wp, &e->k_i, sectors, false);
		bch2_alloc_sectors_done(c, wp);

		extent_for_each_ptr(extent_i_to_s(e), ptr)
			ptr->unwritten = true;
	}

	ret = bch2_extent_update(trans, inum, iter, new.k, &disk_res,
				 0, i_sectors_delta, true);
err:
	if (!ret && sectors_allocated)
		bch2_increment_clock(c, sectors_allocated, WRITE);
	if (should_print_err(ret))
		bch_err_inum_offset_ratelimited(c,
			inum.inum,
			iter->pos.offset << 9,
			"%s(): error: %s", __func__, bch2_err_str(ret));
err_noprint:
	bch2_open_buckets_put(c, &open_buckets);
	bch2_disk_reservation_put(c, &disk_res);
	bch2_bkey_buf_exit(&new, c);
	bch2_bkey_buf_exit(&old, c);

	if (closure_nr_remaining(&cl) != 1) {
		bch2_trans_unlock(trans);
		closure_sync(&cl);
	}

	return ret;
}

/*
 * Returns -BCH_ERR_transacton_restart if we had to drop locks:
 */
int bch2_fpunch_at(struct btree_trans *trans, struct btree_iter *iter,
		   subvol_inum inum, u64 end,
		   s64 *i_sectors_delta)
{
	struct bch_fs *c	= trans->c;
	unsigned max_sectors	= KEY_SIZE_MAX & (~0 << c->block_bits);
	struct bpos end_pos = POS(inum.inum, end);
	struct bkey_s_c k;
	int ret = 0, ret2 = 0;
	u32 snapshot;

	while (!ret ||
	       bch2_err_matches(ret, BCH_ERR_transaction_restart)) {
		struct disk_reservation disk_res =
			bch2_disk_reservation_init(c, 0);
		struct bkey_i delete;

		if (ret)
			ret2 = ret;

		bch2_trans_begin(trans);

		ret = bch2_subvolume_get_snapshot(trans, inum.subvol, &snapshot);
		if (ret)
			continue;

		bch2_btree_iter_set_snapshot(iter, snapshot);

		/*
		 * peek_upto() doesn't have ideal semantics for extents:
		 */
		k = bch2_btree_iter_peek_upto(iter, end_pos);
		if (!k.k)
			break;

		ret = bkey_err(k);
		if (ret)
			continue;

		bkey_init(&delete.k);
		delete.k.p = iter->pos;

		/* create the biggest key we can */
		bch2_key_resize(&delete.k, max_sectors);
		bch2_cut_back(end_pos, &delete);

		ret = bch2_extent_update(trans, inum, iter, &delete,
				&disk_res, 0, i_sectors_delta, false);
		bch2_disk_reservation_put(c, &disk_res);
	}

	return ret ?: ret2;
}

int bch2_fpunch(struct bch_fs *c, subvol_inum inum, u64 start, u64 end,
		s64 *i_sectors_delta)
{
	struct btree_trans *trans = bch2_trans_get(c);
	struct btree_iter iter;
	int ret;

	bch2_trans_iter_init(trans, &iter, BTREE_ID_extents,
			     POS(inum.inum, start),
			     BTREE_ITER_intent);

	ret = bch2_fpunch_at(trans, &iter, inum, end, i_sectors_delta);

	bch2_trans_iter_exit(trans, &iter);
	bch2_trans_put(trans);

	if (bch2_err_matches(ret, BCH_ERR_transaction_restart))
		ret = 0;

	return ret;
}

/* truncate: */

void bch2_logged_op_truncate_to_text(struct printbuf *out, struct bch_fs *c, struct bkey_s_c k)
{
	struct bkey_s_c_logged_op_truncate op = bkey_s_c_to_logged_op_truncate(k);

	prt_printf(out, "subvol=%u", le32_to_cpu(op.v->subvol));
	prt_printf(out, " inum=%llu", le64_to_cpu(op.v->inum));
	prt_printf(out, " new_i_size=%llu", le64_to_cpu(op.v->new_i_size));
}

static int truncate_set_isize(struct btree_trans *trans,
			      subvol_inum inum,
			      u64 new_i_size)
{
	struct btree_iter iter = { NULL };
	struct bch_inode_unpacked inode_u;
	int ret;

	ret   = bch2_inode_peek(trans, &iter, &inode_u, inum, BTREE_ITER_intent) ?:
		(inode_u.bi_size = new_i_size, 0) ?:
		bch2_inode_write(trans, &iter, &inode_u);

	bch2_trans_iter_exit(trans, &iter);
	return ret;
}

static int __bch2_resume_logged_op_truncate(struct btree_trans *trans,
					    struct bkey_i *op_k,
					    u64 *i_sectors_delta)
{
	struct bch_fs *c = trans->c;
	struct btree_iter fpunch_iter;
	struct bkey_i_logged_op_truncate *op = bkey_i_to_logged_op_truncate(op_k);
	subvol_inum inum = { le32_to_cpu(op->v.subvol), le64_to_cpu(op->v.inum) };
	u64 new_i_size = le64_to_cpu(op->v.new_i_size);
	int ret;

	ret = commit_do(trans, NULL, NULL, BCH_TRANS_COMMIT_no_enospc,
			truncate_set_isize(trans, inum, new_i_size));
	if (ret)
		goto err;

	bch2_trans_iter_init(trans, &fpunch_iter, BTREE_ID_extents,
			     POS(inum.inum, round_up(new_i_size, block_bytes(c)) >> 9),
			     BTREE_ITER_intent);
	ret = bch2_fpunch_at(trans, &fpunch_iter, inum, U64_MAX, i_sectors_delta);
	bch2_trans_iter_exit(trans, &fpunch_iter);

	if (bch2_err_matches(ret, BCH_ERR_transaction_restart))
		ret = 0;
err:
	bch2_logged_op_finish(trans, op_k);
	bch_err_fn(c, ret);
	return ret;
}

int bch2_resume_logged_op_truncate(struct btree_trans *trans, struct bkey_i *op_k)
{
	return __bch2_resume_logged_op_truncate(trans, op_k, NULL);
}

int bch2_truncate(struct bch_fs *c, subvol_inum inum, u64 new_i_size, u64 *i_sectors_delta)
{
	struct bkey_i_logged_op_truncate op;

	bkey_logged_op_truncate_init(&op.k_i);
	op.v.subvol	= cpu_to_le32(inum.subvol);
	op.v.inum	= cpu_to_le64(inum.inum);
	op.v.new_i_size	= cpu_to_le64(new_i_size);

	/*
	 * Logged ops aren't atomic w.r.t. snapshot creation: creating a
	 * snapshot while they're in progress, then crashing, will result in the
	 * resume only proceeding in one of the snapshots
	 */
	down_read(&c->snapshot_create_lock);
	int ret = bch2_trans_run(c,
		bch2_logged_op_start(trans, &op.k_i) ?:
		__bch2_resume_logged_op_truncate(trans, &op.k_i, i_sectors_delta));
	up_read(&c->snapshot_create_lock);

	return ret;
}

/* finsert/fcollapse: */

void bch2_logged_op_finsert_to_text(struct printbuf *out, struct bch_fs *c, struct bkey_s_c k)
{
	struct bkey_s_c_logged_op_finsert op = bkey_s_c_to_logged_op_finsert(k);

	prt_printf(out, "subvol=%u",		le32_to_cpu(op.v->subvol));
	prt_printf(out, " inum=%llu",		le64_to_cpu(op.v->inum));
	prt_printf(out, " dst_offset=%lli",	le64_to_cpu(op.v->dst_offset));
	prt_printf(out, " src_offset=%llu",	le64_to_cpu(op.v->src_offset));
}

static int adjust_i_size(struct btree_trans *trans, subvol_inum inum, u64 offset, s64 len)
{
	struct btree_iter iter;
	struct bch_inode_unpacked inode_u;
	int ret;

	offset	<<= 9;
	len	<<= 9;

	ret = bch2_inode_peek(trans, &iter, &inode_u, inum, BTREE_ITER_intent);
	if (ret)
		return ret;

	if (len > 0) {
		if (MAX_LFS_FILESIZE - inode_u.bi_size < len) {
			ret = -EFBIG;
			goto err;
		}

		if (offset >= inode_u.bi_size) {
			ret = -EINVAL;
			goto err;
		}
	}

	inode_u.bi_size += len;
	inode_u.bi_mtime = inode_u.bi_ctime = bch2_current_time(trans->c);

	ret = bch2_inode_write(trans, &iter, &inode_u);
err:
	bch2_trans_iter_exit(trans, &iter);
	return ret;
}

static int __bch2_resume_logged_op_finsert(struct btree_trans *trans,
					   struct bkey_i *op_k,
					   u64 *i_sectors_delta)
{
	struct bch_fs *c = trans->c;
	struct btree_iter iter;
	struct bkey_i_logged_op_finsert *op = bkey_i_to_logged_op_finsert(op_k);
	subvol_inum inum = { le32_to_cpu(op->v.subvol), le64_to_cpu(op->v.inum) };
	struct bch_io_opts opts;
	u64 dst_offset = le64_to_cpu(op->v.dst_offset);
	u64 src_offset = le64_to_cpu(op->v.src_offset);
	s64 shift = dst_offset - src_offset;
	u64 len = abs(shift);
	u64 pos = le64_to_cpu(op->v.pos);
	bool insert = shift > 0;
	int ret = 0;

	ret = bch2_inum_opts_get(trans, inum, &opts);
	if (ret)
		return ret;

	bch2_trans_iter_init(trans, &iter, BTREE_ID_extents,
			     POS(inum.inum, 0),
			     BTREE_ITER_intent);

	switch (op->v.state) {
case LOGGED_OP_FINSERT_start:
	op->v.state = LOGGED_OP_FINSERT_shift_extents;

	if (insert) {
		ret = commit_do(trans, NULL, NULL, BCH_TRANS_COMMIT_no_enospc,
				adjust_i_size(trans, inum, src_offset, len) ?:
				bch2_logged_op_update(trans, &op->k_i));
		if (ret)
			goto err;
	} else {
		bch2_btree_iter_set_pos(&iter, POS(inum.inum, src_offset));

		ret = bch2_fpunch_at(trans, &iter, inum, src_offset + len, i_sectors_delta);
		if (ret && !bch2_err_matches(ret, BCH_ERR_transaction_restart))
			goto err;

		ret = commit_do(trans, NULL, NULL, BCH_TRANS_COMMIT_no_enospc,
				bch2_logged_op_update(trans, &op->k_i));
	}

	fallthrough;
case LOGGED_OP_FINSERT_shift_extents:
	while (1) {
		struct disk_reservation disk_res =
			bch2_disk_reservation_init(c, 0);
		struct bkey_i delete, *copy;
		struct bkey_s_c k;
		struct bpos src_pos = POS(inum.inum, src_offset);
		u32 snapshot;

		bch2_trans_begin(trans);

		ret = bch2_subvolume_get_snapshot(trans, inum.subvol, &snapshot);
		if (ret)
			goto btree_err;

		bch2_btree_iter_set_snapshot(&iter, snapshot);
		bch2_btree_iter_set_pos(&iter, SPOS(inum.inum, pos, snapshot));

		k = insert
			? bch2_btree_iter_peek_prev(&iter)
			: bch2_btree_iter_peek_upto(&iter, POS(inum.inum, U64_MAX));
		if ((ret = bkey_err(k)))
			goto btree_err;

		if (!k.k ||
		    k.k->p.inode != inum.inum ||
		    bkey_le(k.k->p, POS(inum.inum, src_offset)))
			break;

		copy = bch2_bkey_make_mut_noupdate(trans, k);
		if ((ret = PTR_ERR_OR_ZERO(copy)))
			goto btree_err;

		if (insert &&
		    bkey_lt(bkey_start_pos(k.k), src_pos)) {
			bch2_cut_front(src_pos, copy);

			/* Splitting compressed extent? */
			bch2_disk_reservation_add(c, &disk_res,
					copy->k.size *
					bch2_bkey_nr_ptrs_allocated(bkey_i_to_s_c(copy)),
					BCH_DISK_RESERVATION_NOFAIL);
		}

		bkey_init(&delete.k);
		delete.k.p = copy->k.p;
		delete.k.p.snapshot = snapshot;
		delete.k.size = copy->k.size;

		copy->k.p.offset += shift;
		copy->k.p.snapshot = snapshot;

		op->v.pos = cpu_to_le64(insert ? bkey_start_offset(&delete.k) : delete.k.p.offset);

		ret =   bch2_bkey_set_needs_rebalance(c, copy, &opts) ?:
			bch2_btree_insert_trans(trans, BTREE_ID_extents, &delete, 0) ?:
			bch2_btree_insert_trans(trans, BTREE_ID_extents, copy, 0) ?:
			bch2_logged_op_update(trans, &op->k_i) ?:
			bch2_trans_commit(trans, &disk_res, NULL, BCH_TRANS_COMMIT_no_enospc);
btree_err:
		bch2_disk_reservation_put(c, &disk_res);

		if (bch2_err_matches(ret, BCH_ERR_transaction_restart))
			continue;
		if (ret)
			goto err;

		pos = le64_to_cpu(op->v.pos);
	}

	op->v.state = LOGGED_OP_FINSERT_finish;

	if (!insert) {
		ret = commit_do(trans, NULL, NULL, BCH_TRANS_COMMIT_no_enospc,
				adjust_i_size(trans, inum, src_offset, shift) ?:
				bch2_logged_op_update(trans, &op->k_i));
	} else {
		/* We need an inode update to update bi_journal_seq for fsync: */
		ret = commit_do(trans, NULL, NULL, BCH_TRANS_COMMIT_no_enospc,
				adjust_i_size(trans, inum, 0, 0) ?:
				bch2_logged_op_update(trans, &op->k_i));
	}

	break;
case LOGGED_OP_FINSERT_finish:
	break;
	}
err:
	bch_err_fn(c, ret);
	bch2_logged_op_finish(trans, op_k);
	bch2_trans_iter_exit(trans, &iter);
	return ret;
}

int bch2_resume_logged_op_finsert(struct btree_trans *trans, struct bkey_i *op_k)
{
	return __bch2_resume_logged_op_finsert(trans, op_k, NULL);
}

int bch2_fcollapse_finsert(struct bch_fs *c, subvol_inum inum,
			   u64 offset, u64 len, bool insert,
			   s64 *i_sectors_delta)
{
	struct bkey_i_logged_op_finsert op;
	s64 shift = insert ? len : -len;

	bkey_logged_op_finsert_init(&op.k_i);
	op.v.subvol	= cpu_to_le32(inum.subvol);
	op.v.inum	= cpu_to_le64(inum.inum);
	op.v.dst_offset	= cpu_to_le64(offset + shift);
	op.v.src_offset	= cpu_to_le64(offset);
	op.v.pos	= cpu_to_le64(insert ? U64_MAX : offset);

	/*
	 * Logged ops aren't atomic w.r.t. snapshot creation: creating a
	 * snapshot while they're in progress, then crashing, will result in the
	 * resume only proceeding in one of the snapshots
	 */
	down_read(&c->snapshot_create_lock);
	int ret = bch2_trans_run(c,
		bch2_logged_op_start(trans, &op.k_i) ?:
		__bch2_resume_logged_op_finsert(trans, &op.k_i, i_sectors_delta));
	up_read(&c->snapshot_create_lock);

	return ret;
}