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1// SPDX-License-Identifier: GPL-2.02#ifndef NO_BCACHEFS_FS3 4#include "bcachefs.h"5#include "alloc_foreground.h"6#include "bkey_buf.h"7#include "btree_update.h"8#include "buckets.h"9#include "clock.h"10#include "error.h"11#include "extents.h"12#include "extent_update.h"13#include "fs.h"14#include "fs-io.h"15#include "fs-io-buffered.h"16#include "fs-io-pagecache.h"17#include "fsck.h"18#include "inode.h"19#include "journal.h"20#include "io_misc.h"21#include "keylist.h"22#include "quota.h"23#include "reflink.h"24#include "trace.h"25 26#include <linux/aio.h>27#include <linux/backing-dev.h>28#include <linux/falloc.h>29#include <linux/migrate.h>30#include <linux/mmu_context.h>31#include <linux/pagevec.h>32#include <linux/rmap.h>33#include <linux/sched/signal.h>34#include <linux/task_io_accounting_ops.h>35#include <linux/uio.h>36 37#include <trace/events/writeback.h>38 39struct nocow_flush {40	struct closure	*cl;41	struct bch_dev	*ca;42	struct bio	bio;43};44 45static void nocow_flush_endio(struct bio *_bio)46{47 48	struct nocow_flush *bio = container_of(_bio, struct nocow_flush, bio);49 50	closure_put(bio->cl);51	percpu_ref_put(&bio->ca->io_ref);52	bio_put(&bio->bio);53}54 55void bch2_inode_flush_nocow_writes_async(struct bch_fs *c,56					 struct bch_inode_info *inode,57					 struct closure *cl)58{59	struct nocow_flush *bio;60	struct bch_dev *ca;61	struct bch_devs_mask devs;62	unsigned dev;63 64	dev = find_first_bit(inode->ei_devs_need_flush.d, BCH_SB_MEMBERS_MAX);65	if (dev == BCH_SB_MEMBERS_MAX)66		return;67 68	devs = inode->ei_devs_need_flush;69	memset(&inode->ei_devs_need_flush, 0, sizeof(inode->ei_devs_need_flush));70 71	for_each_set_bit(dev, devs.d, BCH_SB_MEMBERS_MAX) {72		rcu_read_lock();73		ca = rcu_dereference(c->devs[dev]);74		if (ca && !percpu_ref_tryget(&ca->io_ref))75			ca = NULL;76		rcu_read_unlock();77 78		if (!ca)79			continue;80 81		bio = container_of(bio_alloc_bioset(ca->disk_sb.bdev, 0,82						    REQ_OP_WRITE|REQ_PREFLUSH,83						    GFP_KERNEL,84						    &c->nocow_flush_bioset),85				   struct nocow_flush, bio);86		bio->cl			= cl;87		bio->ca			= ca;88		bio->bio.bi_end_io	= nocow_flush_endio;89		closure_bio_submit(&bio->bio, cl);90	}91}92 93static int bch2_inode_flush_nocow_writes(struct bch_fs *c,94					 struct bch_inode_info *inode)95{96	struct closure cl;97 98	closure_init_stack(&cl);99	bch2_inode_flush_nocow_writes_async(c, inode, &cl);100	closure_sync(&cl);101 102	return 0;103}104 105/* i_size updates: */106 107struct inode_new_size {108	loff_t		new_size;109	u64		now;110	unsigned	fields;111};112 113static int inode_set_size(struct btree_trans *trans,114			  struct bch_inode_info *inode,115			  struct bch_inode_unpacked *bi,116			  void *p)117{118	struct inode_new_size *s = p;119 120	bi->bi_size = s->new_size;121	if (s->fields & ATTR_ATIME)122		bi->bi_atime = s->now;123	if (s->fields & ATTR_MTIME)124		bi->bi_mtime = s->now;125	if (s->fields & ATTR_CTIME)126		bi->bi_ctime = s->now;127 128	return 0;129}130 131int __must_check bch2_write_inode_size(struct bch_fs *c,132				       struct bch_inode_info *inode,133				       loff_t new_size, unsigned fields)134{135	struct inode_new_size s = {136		.new_size	= new_size,137		.now		= bch2_current_time(c),138		.fields		= fields,139	};140 141	return bch2_write_inode(c, inode, inode_set_size, &s, fields);142}143 144void __bch2_i_sectors_acct(struct bch_fs *c, struct bch_inode_info *inode,145			   struct quota_res *quota_res, s64 sectors)146{147	bch2_fs_inconsistent_on((s64) inode->v.i_blocks + sectors < 0, c,148				"inode %lu i_blocks underflow: %llu + %lli < 0 (ondisk %lli)",149				inode->v.i_ino, (u64) inode->v.i_blocks, sectors,150				inode->ei_inode.bi_sectors);151	inode->v.i_blocks += sectors;152 153#ifdef CONFIG_BCACHEFS_QUOTA154	if (quota_res &&155	    !test_bit(EI_INODE_SNAPSHOT, &inode->ei_flags) &&156	    sectors > 0) {157		BUG_ON(sectors > quota_res->sectors);158		BUG_ON(sectors > inode->ei_quota_reserved);159 160		quota_res->sectors -= sectors;161		inode->ei_quota_reserved -= sectors;162	} else {163		bch2_quota_acct(c, inode->ei_qid, Q_SPC, sectors, KEY_TYPE_QUOTA_WARN);164	}165#endif166}167 168/* fsync: */169 170/*171 * inode->ei_inode.bi_journal_seq won't be up to date since it's set in an172 * insert trigger: look up the btree inode instead173 */174static int bch2_flush_inode(struct bch_fs *c,175			    struct bch_inode_info *inode)176{177	if (c->opts.journal_flush_disabled)178		return 0;179 180	if (!bch2_write_ref_tryget(c, BCH_WRITE_REF_fsync))181		return -EROFS;182 183	struct bch_inode_unpacked u;184	int ret = bch2_inode_find_by_inum(c, inode_inum(inode), &u) ?:185		  bch2_journal_flush_seq(&c->journal, u.bi_journal_seq, TASK_INTERRUPTIBLE) ?:186		  bch2_inode_flush_nocow_writes(c, inode);187	bch2_write_ref_put(c, BCH_WRITE_REF_fsync);188	return ret;189}190 191int bch2_fsync(struct file *file, loff_t start, loff_t end, int datasync)192{193	struct bch_inode_info *inode = file_bch_inode(file);194	struct bch_fs *c = inode->v.i_sb->s_fs_info;195	int ret, err;196 197	trace_bch2_fsync(file, datasync);198 199	ret = file_write_and_wait_range(file, start, end);200	if (ret)201		goto out;202	ret = sync_inode_metadata(&inode->v, 1);203	if (ret)204		goto out;205	ret = bch2_flush_inode(c, inode);206out:207	ret = bch2_err_class(ret);208	if (ret == -EROFS)209		ret = -EIO;210 211	err = file_check_and_advance_wb_err(file);212	if (!ret)213		ret = err;214 215	return ret;216}217 218/* truncate: */219 220static inline int range_has_data(struct bch_fs *c, u32 subvol,221				 struct bpos start,222				 struct bpos end)223{224	return bch2_trans_run(c,225		for_each_btree_key_in_subvolume_upto(trans, iter, BTREE_ID_extents, start, end,226						    subvol, 0, k, ({227			bkey_extent_is_data(k.k) && !bkey_extent_is_unwritten(k);228		})));229}230 231static int __bch2_truncate_folio(struct bch_inode_info *inode,232				 pgoff_t index, loff_t start, loff_t end)233{234	struct bch_fs *c = inode->v.i_sb->s_fs_info;235	struct address_space *mapping = inode->v.i_mapping;236	struct bch_folio *s;237	unsigned start_offset;238	unsigned end_offset;239	unsigned i;240	struct folio *folio;241	s64 i_sectors_delta = 0;242	int ret = 0;243	u64 end_pos;244 245	folio = filemap_lock_folio(mapping, index);246	if (IS_ERR_OR_NULL(folio)) {247		/*248		 * XXX: we're doing two index lookups when we end up reading the249		 * folio250		 */251		ret = range_has_data(c, inode->ei_inum.subvol,252				POS(inode->v.i_ino, (index << PAGE_SECTORS_SHIFT)),253				POS(inode->v.i_ino, (index << PAGE_SECTORS_SHIFT) + PAGE_SECTORS));254		if (ret <= 0)255			return ret;256 257		folio = __filemap_get_folio(mapping, index,258					    FGP_LOCK|FGP_CREAT, GFP_KERNEL);259		if (IS_ERR_OR_NULL(folio)) {260			ret = -ENOMEM;261			goto out;262		}263	}264 265	BUG_ON(start	>= folio_end_pos(folio));266	BUG_ON(end	<= folio_pos(folio));267 268	start_offset	= max(start, folio_pos(folio)) - folio_pos(folio);269	end_offset	= min_t(u64, end, folio_end_pos(folio)) - folio_pos(folio);270 271	/* Folio boundary? Nothing to do */272	if (start_offset == 0 &&273	    end_offset == folio_size(folio)) {274		ret = 0;275		goto unlock;276	}277 278	s = bch2_folio_create(folio, 0);279	if (!s) {280		ret = -ENOMEM;281		goto unlock;282	}283 284	if (!folio_test_uptodate(folio)) {285		ret = bch2_read_single_folio(folio, mapping);286		if (ret)287			goto unlock;288	}289 290	ret = bch2_folio_set(c, inode_inum(inode), &folio, 1);291	if (ret)292		goto unlock;293 294	for (i = round_up(start_offset, block_bytes(c)) >> 9;295	     i < round_down(end_offset, block_bytes(c)) >> 9;296	     i++) {297		s->s[i].nr_replicas	= 0;298 299		i_sectors_delta -= s->s[i].state == SECTOR_dirty;300		bch2_folio_sector_set(folio, s, i, SECTOR_unallocated);301	}302 303	bch2_i_sectors_acct(c, inode, NULL, i_sectors_delta);304 305	/*306	 * Caller needs to know whether this folio will be written out by307	 * writeback - doing an i_size update if necessary - or whether it will308	 * be responsible for the i_size update.309	 *310	 * Note that we shouldn't ever see a folio beyond EOF, but check and311	 * warn if so. This has been observed by failure to clean up folios312	 * after a short write and there's still a chance reclaim will fix313	 * things up.314	 */315	WARN_ON_ONCE(folio_pos(folio) >= inode->v.i_size);316	end_pos = folio_end_pos(folio);317	if (inode->v.i_size > folio_pos(folio))318		end_pos = min_t(u64, inode->v.i_size, end_pos);319	ret = s->s[folio_pos_to_s(folio, end_pos - 1)].state >= SECTOR_dirty;320 321	folio_zero_segment(folio, start_offset, end_offset);322 323	/*324	 * Bit of a hack - we don't want truncate to fail due to -ENOSPC.325	 *326	 * XXX: because we aren't currently tracking whether the folio has actual327	 * data in it (vs. just 0s, or only partially written) this wrong. ick.328	 */329	BUG_ON(bch2_get_folio_disk_reservation(c, inode, folio, false));330 331	/*332	 * This removes any writeable userspace mappings; we need to force333	 * .page_mkwrite to be called again before any mmapped writes, to334	 * redirty the full page:335	 */336	folio_mkclean(folio);337	filemap_dirty_folio(mapping, folio);338unlock:339	folio_unlock(folio);340	folio_put(folio);341out:342	return ret;343}344 345static int bch2_truncate_folio(struct bch_inode_info *inode, loff_t from)346{347	return __bch2_truncate_folio(inode, from >> PAGE_SHIFT,348				     from, ANYSINT_MAX(loff_t));349}350 351static int bch2_truncate_folios(struct bch_inode_info *inode,352				loff_t start, loff_t end)353{354	int ret = __bch2_truncate_folio(inode, start >> PAGE_SHIFT,355					start, end);356 357	if (ret >= 0 &&358	    start >> PAGE_SHIFT != end >> PAGE_SHIFT)359		ret = __bch2_truncate_folio(inode,360					(end - 1) >> PAGE_SHIFT,361					start, end);362	return ret;363}364 365static int bch2_extend(struct mnt_idmap *idmap,366		       struct bch_inode_info *inode,367		       struct bch_inode_unpacked *inode_u,368		       struct iattr *iattr)369{370	struct address_space *mapping = inode->v.i_mapping;371	int ret;372 373	/*374	 * sync appends:375	 *376	 * this has to be done _before_ extending i_size:377	 */378	ret = filemap_write_and_wait_range(mapping, inode_u->bi_size, S64_MAX);379	if (ret)380		return ret;381 382	truncate_setsize(&inode->v, iattr->ia_size);383 384	return bch2_setattr_nonsize(idmap, inode, iattr);385}386 387int bchfs_truncate(struct mnt_idmap *idmap,388		  struct bch_inode_info *inode, struct iattr *iattr)389{390	struct bch_fs *c = inode->v.i_sb->s_fs_info;391	struct address_space *mapping = inode->v.i_mapping;392	struct bch_inode_unpacked inode_u;393	s64 i_sectors_delta = 0;394	int ret = 0;395 396	/*397	 * If the truncate call with change the size of the file, the398	 * cmtimes should be updated. If the size will not change, we399	 * do not need to update the cmtimes.400	 */401	if (iattr->ia_size != inode->v.i_size) {402		if (!(iattr->ia_valid & ATTR_MTIME))403			ktime_get_coarse_real_ts64(&iattr->ia_mtime);404		if (!(iattr->ia_valid & ATTR_CTIME))405			ktime_get_coarse_real_ts64(&iattr->ia_ctime);406		iattr->ia_valid |= ATTR_MTIME|ATTR_CTIME;407	}408 409	inode_dio_wait(&inode->v);410	bch2_pagecache_block_get(inode);411 412	ret = bch2_inode_find_by_inum(c, inode_inum(inode), &inode_u);413	if (ret)414		goto err;415 416	/*417	 * check this before next assertion; on filesystem error our normal418	 * invariants are a bit broken (truncate has to truncate the page cache419	 * before the inode).420	 */421	ret = bch2_journal_error(&c->journal);422	if (ret)423		goto err;424 425	WARN_ONCE(!test_bit(EI_INODE_ERROR, &inode->ei_flags) &&426		  inode->v.i_size < inode_u.bi_size,427		  "truncate spotted in mem i_size < btree i_size: %llu < %llu\n",428		  (u64) inode->v.i_size, inode_u.bi_size);429 430	if (iattr->ia_size > inode->v.i_size) {431		ret = bch2_extend(idmap, inode, &inode_u, iattr);432		goto err;433	}434 435	iattr->ia_valid &= ~ATTR_SIZE;436 437	ret = bch2_truncate_folio(inode, iattr->ia_size);438	if (unlikely(ret < 0))439		goto err;440 441	truncate_setsize(&inode->v, iattr->ia_size);442 443	/*444	 * When extending, we're going to write the new i_size to disk445	 * immediately so we need to flush anything above the current on disk446	 * i_size first:447	 *448	 * Also, when extending we need to flush the page that i_size currently449	 * straddles - if it's mapped to userspace, we need to ensure that450	 * userspace has to redirty it and call .mkwrite -> set_page_dirty451	 * again to allocate the part of the page that was extended.452	 */453	if (iattr->ia_size > inode_u.bi_size)454		ret = filemap_write_and_wait_range(mapping,455				inode_u.bi_size,456				iattr->ia_size - 1);457	else if (iattr->ia_size & (PAGE_SIZE - 1))458		ret = filemap_write_and_wait_range(mapping,459				round_down(iattr->ia_size, PAGE_SIZE),460				iattr->ia_size - 1);461	if (ret)462		goto err;463 464	ret = bch2_truncate(c, inode_inum(inode), iattr->ia_size, &i_sectors_delta);465	bch2_i_sectors_acct(c, inode, NULL, i_sectors_delta);466 467	if (unlikely(ret)) {468		/*469		 * If we error here, VFS caches are now inconsistent with btree470		 */471		set_bit(EI_INODE_ERROR, &inode->ei_flags);472		goto err;473	}474 475	bch2_fs_inconsistent_on(!inode->v.i_size && inode->v.i_blocks &&476				!bch2_journal_error(&c->journal), c,477				"inode %lu truncated to 0 but i_blocks %llu (ondisk %lli)",478				inode->v.i_ino, (u64) inode->v.i_blocks,479				inode->ei_inode.bi_sectors);480 481	ret = bch2_setattr_nonsize(idmap, inode, iattr);482err:483	bch2_pagecache_block_put(inode);484	return bch2_err_class(ret);485}486 487/* fallocate: */488 489static int inode_update_times_fn(struct btree_trans *trans,490				 struct bch_inode_info *inode,491				 struct bch_inode_unpacked *bi, void *p)492{493	struct bch_fs *c = inode->v.i_sb->s_fs_info;494 495	bi->bi_mtime = bi->bi_ctime = bch2_current_time(c);496	return 0;497}498 499static noinline long bchfs_fpunch(struct bch_inode_info *inode, loff_t offset, loff_t len)500{501	struct bch_fs *c = inode->v.i_sb->s_fs_info;502	u64 end		= offset + len;503	u64 block_start	= round_up(offset, block_bytes(c));504	u64 block_end	= round_down(end, block_bytes(c));505	bool truncated_last_page;506	int ret = 0;507 508	ret = bch2_truncate_folios(inode, offset, end);509	if (unlikely(ret < 0))510		goto err;511 512	truncated_last_page = ret;513 514	truncate_pagecache_range(&inode->v, offset, end - 1);515 516	if (block_start < block_end) {517		s64 i_sectors_delta = 0;518 519		ret = bch2_fpunch(c, inode_inum(inode),520				  block_start >> 9, block_end >> 9,521				  &i_sectors_delta);522		bch2_i_sectors_acct(c, inode, NULL, i_sectors_delta);523	}524 525	mutex_lock(&inode->ei_update_lock);526	if (end >= inode->v.i_size && !truncated_last_page) {527		ret = bch2_write_inode_size(c, inode, inode->v.i_size,528					    ATTR_MTIME|ATTR_CTIME);529	} else {530		ret = bch2_write_inode(c, inode, inode_update_times_fn, NULL,531				       ATTR_MTIME|ATTR_CTIME);532	}533	mutex_unlock(&inode->ei_update_lock);534err:535	return ret;536}537 538static noinline long bchfs_fcollapse_finsert(struct bch_inode_info *inode,539				   loff_t offset, loff_t len,540				   bool insert)541{542	struct bch_fs *c = inode->v.i_sb->s_fs_info;543	struct address_space *mapping = inode->v.i_mapping;544	s64 i_sectors_delta = 0;545	int ret = 0;546 547	if ((offset | len) & (block_bytes(c) - 1))548		return -EINVAL;549 550	if (insert) {551		if (offset >= inode->v.i_size)552			return -EINVAL;553	} else {554		if (offset + len >= inode->v.i_size)555			return -EINVAL;556	}557 558	ret = bch2_write_invalidate_inode_pages_range(mapping, offset, LLONG_MAX);559	if (ret)560		return ret;561 562	if (insert)563		i_size_write(&inode->v, inode->v.i_size + len);564 565	ret = bch2_fcollapse_finsert(c, inode_inum(inode), offset >> 9, len >> 9,566				     insert, &i_sectors_delta);567	if (!ret && !insert)568		i_size_write(&inode->v, inode->v.i_size - len);569	bch2_i_sectors_acct(c, inode, NULL, i_sectors_delta);570 571	return ret;572}573 574static noinline int __bchfs_fallocate(struct bch_inode_info *inode, int mode,575			     u64 start_sector, u64 end_sector)576{577	struct bch_fs *c = inode->v.i_sb->s_fs_info;578	struct btree_trans *trans = bch2_trans_get(c);579	struct btree_iter iter;580	struct bpos end_pos = POS(inode->v.i_ino, end_sector);581	struct bch_io_opts opts;582	int ret = 0;583 584	bch2_inode_opts_get(&opts, c, &inode->ei_inode);585 586	bch2_trans_iter_init(trans, &iter, BTREE_ID_extents,587			POS(inode->v.i_ino, start_sector),588			BTREE_ITER_slots|BTREE_ITER_intent);589 590	while (!ret) {591		s64 i_sectors_delta = 0;592		struct quota_res quota_res = { 0 };593		struct bkey_s_c k;594		unsigned sectors;595		bool is_allocation;596		u64 hole_start, hole_end;597		u32 snapshot;598 599		bch2_trans_begin(trans);600 601		if (bkey_ge(iter.pos, end_pos))602			break;603 604		ret = bch2_subvolume_get_snapshot(trans,605					inode->ei_inum.subvol, &snapshot);606		if (ret)607			goto bkey_err;608 609		bch2_btree_iter_set_snapshot(&iter, snapshot);610 611		k = bch2_btree_iter_peek_slot(&iter);612		if ((ret = bkey_err(k)))613			goto bkey_err;614 615		hole_start	= iter.pos.offset;616		hole_end	= bpos_min(k.k->p, end_pos).offset;617		is_allocation	= bkey_extent_is_allocation(k.k);618 619		/* already reserved */620		if (bkey_extent_is_reservation(k) &&621		    bch2_bkey_nr_ptrs_fully_allocated(k) >= opts.data_replicas) {622			bch2_btree_iter_advance(&iter);623			continue;624		}625 626		if (bkey_extent_is_data(k.k) &&627		    !(mode & FALLOC_FL_ZERO_RANGE)) {628			bch2_btree_iter_advance(&iter);629			continue;630		}631 632		if (!(mode & FALLOC_FL_ZERO_RANGE)) {633			/*634			 * Lock ordering - can't be holding btree locks while635			 * blocking on a folio lock:636			 */637			if (bch2_clamp_data_hole(&inode->v,638						 &hole_start,639						 &hole_end,640						 opts.data_replicas, true)) {641				ret = drop_locks_do(trans,642					(bch2_clamp_data_hole(&inode->v,643							      &hole_start,644							      &hole_end,645							      opts.data_replicas, false), 0));646				if (ret)647					goto bkey_err;648			}649			bch2_btree_iter_set_pos(&iter, POS(iter.pos.inode, hole_start));650 651			if (ret)652				goto bkey_err;653 654			if (hole_start == hole_end)655				continue;656		}657 658		sectors	= hole_end - hole_start;659 660		if (!is_allocation) {661			ret = bch2_quota_reservation_add(c, inode,662					&quota_res, sectors, true);663			if (unlikely(ret))664				goto bkey_err;665		}666 667		ret = bch2_extent_fallocate(trans, inode_inum(inode), &iter,668					    sectors, opts, &i_sectors_delta,669					    writepoint_hashed((unsigned long) current));670		if (ret)671			goto bkey_err;672 673		bch2_i_sectors_acct(c, inode, &quota_res, i_sectors_delta);674 675		if (bch2_mark_pagecache_reserved(inode, &hole_start,676						 iter.pos.offset, true)) {677			ret = drop_locks_do(trans,678				bch2_mark_pagecache_reserved(inode, &hole_start,679							     iter.pos.offset, false));680			if (ret)681				goto bkey_err;682		}683bkey_err:684		bch2_quota_reservation_put(c, inode, &quota_res);685		if (bch2_err_matches(ret, BCH_ERR_transaction_restart))686			ret = 0;687	}688 689	if (bch2_err_matches(ret, ENOSPC) && (mode & FALLOC_FL_ZERO_RANGE)) {690		struct quota_res quota_res = { 0 };691		s64 i_sectors_delta = 0;692 693		bch2_fpunch_at(trans, &iter, inode_inum(inode),694			       end_sector, &i_sectors_delta);695		bch2_i_sectors_acct(c, inode, &quota_res, i_sectors_delta);696		bch2_quota_reservation_put(c, inode, &quota_res);697	}698 699	bch2_trans_iter_exit(trans, &iter);700	bch2_trans_put(trans);701	return ret;702}703 704static noinline long bchfs_fallocate(struct bch_inode_info *inode, int mode,705			    loff_t offset, loff_t len)706{707	struct bch_fs *c = inode->v.i_sb->s_fs_info;708	u64 end		= offset + len;709	u64 block_start	= round_down(offset,	block_bytes(c));710	u64 block_end	= round_up(end,		block_bytes(c));711	bool truncated_last_page = false;712	int ret, ret2 = 0;713 714	if (!(mode & FALLOC_FL_KEEP_SIZE) && end > inode->v.i_size) {715		ret = inode_newsize_ok(&inode->v, end);716		if (ret)717			return ret;718	}719 720	if (mode & FALLOC_FL_ZERO_RANGE) {721		ret = bch2_truncate_folios(inode, offset, end);722		if (unlikely(ret < 0))723			return ret;724 725		truncated_last_page = ret;726 727		truncate_pagecache_range(&inode->v, offset, end - 1);728 729		block_start	= round_up(offset,	block_bytes(c));730		block_end	= round_down(end,	block_bytes(c));731	}732 733	ret = __bchfs_fallocate(inode, mode, block_start >> 9, block_end >> 9);734 735	/*736	 * On -ENOSPC in ZERO_RANGE mode, we still want to do the inode update,737	 * so that the VFS cache i_size is consistent with the btree i_size:738	 */739	if (ret &&740	    !(bch2_err_matches(ret, ENOSPC) && (mode & FALLOC_FL_ZERO_RANGE)))741		return ret;742 743	if (mode & FALLOC_FL_KEEP_SIZE && end > inode->v.i_size)744		end = inode->v.i_size;745 746	if (end >= inode->v.i_size &&747	    (((mode & FALLOC_FL_ZERO_RANGE) && !truncated_last_page) ||748	     !(mode & FALLOC_FL_KEEP_SIZE))) {749		spin_lock(&inode->v.i_lock);750		i_size_write(&inode->v, end);751		spin_unlock(&inode->v.i_lock);752 753		mutex_lock(&inode->ei_update_lock);754		ret2 = bch2_write_inode_size(c, inode, end, 0);755		mutex_unlock(&inode->ei_update_lock);756	}757 758	return ret ?: ret2;759}760 761long bch2_fallocate_dispatch(struct file *file, int mode,762			     loff_t offset, loff_t len)763{764	struct bch_inode_info *inode = file_bch_inode(file);765	struct bch_fs *c = inode->v.i_sb->s_fs_info;766	long ret;767 768	if (!bch2_write_ref_tryget(c, BCH_WRITE_REF_fallocate))769		return -EROFS;770 771	inode_lock(&inode->v);772	inode_dio_wait(&inode->v);773	bch2_pagecache_block_get(inode);774 775	ret = file_modified(file);776	if (ret)777		goto err;778 779	if (!(mode & ~(FALLOC_FL_KEEP_SIZE|FALLOC_FL_ZERO_RANGE)))780		ret = bchfs_fallocate(inode, mode, offset, len);781	else if (mode == (FALLOC_FL_PUNCH_HOLE|FALLOC_FL_KEEP_SIZE))782		ret = bchfs_fpunch(inode, offset, len);783	else if (mode == FALLOC_FL_INSERT_RANGE)784		ret = bchfs_fcollapse_finsert(inode, offset, len, true);785	else if (mode == FALLOC_FL_COLLAPSE_RANGE)786		ret = bchfs_fcollapse_finsert(inode, offset, len, false);787	else788		ret = -EOPNOTSUPP;789err:790	bch2_pagecache_block_put(inode);791	inode_unlock(&inode->v);792	bch2_write_ref_put(c, BCH_WRITE_REF_fallocate);793 794	return bch2_err_class(ret);795}796 797/*798 * Take a quota reservation for unallocated blocks in a given file range799 * Does not check pagecache800 */801static int quota_reserve_range(struct bch_inode_info *inode,802			       struct quota_res *res,803			       u64 start, u64 end)804{805	struct bch_fs *c = inode->v.i_sb->s_fs_info;806	u64 sectors = end - start;807 808	int ret = bch2_trans_run(c,809		for_each_btree_key_in_subvolume_upto(trans, iter,810				BTREE_ID_extents,811				POS(inode->v.i_ino, start),812				POS(inode->v.i_ino, end - 1),813				inode->ei_inum.subvol, 0, k, ({814			if (bkey_extent_is_allocation(k.k)) {815				u64 s = min(end, k.k->p.offset) -816					max(start, bkey_start_offset(k.k));817				BUG_ON(s > sectors);818				sectors -= s;819			}820 821			0;822		})));823 824	return ret ?: bch2_quota_reservation_add(c, inode, res, sectors, true);825}826 827loff_t bch2_remap_file_range(struct file *file_src, loff_t pos_src,828			     struct file *file_dst, loff_t pos_dst,829			     loff_t len, unsigned remap_flags)830{831	struct bch_inode_info *src = file_bch_inode(file_src);832	struct bch_inode_info *dst = file_bch_inode(file_dst);833	struct bch_fs *c = src->v.i_sb->s_fs_info;834	struct quota_res quota_res = { 0 };835	s64 i_sectors_delta = 0;836	u64 aligned_len;837	loff_t ret = 0;838 839	if (remap_flags & ~(REMAP_FILE_DEDUP|REMAP_FILE_ADVISORY))840		return -EINVAL;841 842	if ((pos_src & (block_bytes(c) - 1)) ||843	    (pos_dst & (block_bytes(c) - 1)))844		return -EINVAL;845 846	if (src == dst &&847	    abs(pos_src - pos_dst) < len)848		return -EINVAL;849 850	lock_two_nondirectories(&src->v, &dst->v);851	bch2_lock_inodes(INODE_PAGECACHE_BLOCK, src, dst);852 853	inode_dio_wait(&src->v);854	inode_dio_wait(&dst->v);855 856	ret = generic_remap_file_range_prep(file_src, pos_src,857					    file_dst, pos_dst,858					    &len, remap_flags);859	if (ret < 0 || len == 0)860		goto err;861 862	aligned_len = round_up((u64) len, block_bytes(c));863 864	ret = bch2_write_invalidate_inode_pages_range(dst->v.i_mapping,865				pos_dst, pos_dst + len - 1);866	if (ret)867		goto err;868 869	ret = quota_reserve_range(dst, &quota_res, pos_dst >> 9,870				  (pos_dst + aligned_len) >> 9);871	if (ret)872		goto err;873 874	if (!(remap_flags & REMAP_FILE_DEDUP))875		file_update_time(file_dst);876 877	bch2_mark_pagecache_unallocated(src, pos_src >> 9,878				   (pos_src + aligned_len) >> 9);879 880	ret = bch2_remap_range(c,881			       inode_inum(dst), pos_dst >> 9,882			       inode_inum(src), pos_src >> 9,883			       aligned_len >> 9,884			       pos_dst + len, &i_sectors_delta);885	if (ret < 0)886		goto err;887 888	/*889	 * due to alignment, we might have remapped slightly more than requsted890	 */891	ret = min((u64) ret << 9, (u64) len);892 893	bch2_i_sectors_acct(c, dst, &quota_res, i_sectors_delta);894 895	spin_lock(&dst->v.i_lock);896	if (pos_dst + ret > dst->v.i_size)897		i_size_write(&dst->v, pos_dst + ret);898	spin_unlock(&dst->v.i_lock);899 900	if ((file_dst->f_flags & (__O_SYNC | O_DSYNC)) ||901	    IS_SYNC(file_inode(file_dst)))902		ret = bch2_flush_inode(c, dst);903err:904	bch2_quota_reservation_put(c, dst, &quota_res);905	bch2_unlock_inodes(INODE_PAGECACHE_BLOCK, src, dst);906	unlock_two_nondirectories(&src->v, &dst->v);907 908	return bch2_err_class(ret);909}910 911/* fseek: */912 913static loff_t bch2_seek_data(struct file *file, u64 offset)914{915	struct bch_inode_info *inode = file_bch_inode(file);916	struct bch_fs *c = inode->v.i_sb->s_fs_info;917	subvol_inum inum = inode_inum(inode);918	u64 isize, next_data = MAX_LFS_FILESIZE;919 920	isize = i_size_read(&inode->v);921	if (offset >= isize)922		return -ENXIO;923 924	int ret = bch2_trans_run(c,925		for_each_btree_key_in_subvolume_upto(trans, iter, BTREE_ID_extents,926				   POS(inode->v.i_ino, offset >> 9),927				   POS(inode->v.i_ino, U64_MAX),928				   inum.subvol, 0, k, ({929			if (bkey_extent_is_data(k.k)) {930				next_data = max(offset, bkey_start_offset(k.k) << 9);931				break;932			} else if (k.k->p.offset >> 9 > isize)933				break;934			0;935		})));936	if (ret)937		return ret;938 939	if (next_data > offset)940		next_data = bch2_seek_pagecache_data(&inode->v,941					offset, next_data, 0, false);942 943	if (next_data >= isize)944		return -ENXIO;945 946	return vfs_setpos(file, next_data, MAX_LFS_FILESIZE);947}948 949static loff_t bch2_seek_hole(struct file *file, u64 offset)950{951	struct bch_inode_info *inode = file_bch_inode(file);952	struct bch_fs *c = inode->v.i_sb->s_fs_info;953	subvol_inum inum = inode_inum(inode);954	u64 isize, next_hole = MAX_LFS_FILESIZE;955 956	isize = i_size_read(&inode->v);957	if (offset >= isize)958		return -ENXIO;959 960	int ret = bch2_trans_run(c,961		for_each_btree_key_in_subvolume_upto(trans, iter, BTREE_ID_extents,962				   POS(inode->v.i_ino, offset >> 9),963				   POS(inode->v.i_ino, U64_MAX),964				   inum.subvol, BTREE_ITER_slots, k, ({965			if (k.k->p.inode != inode->v.i_ino) {966				next_hole = bch2_seek_pagecache_hole(&inode->v,967						offset, MAX_LFS_FILESIZE, 0, false);968				break;969			} else if (!bkey_extent_is_data(k.k)) {970				next_hole = bch2_seek_pagecache_hole(&inode->v,971						max(offset, bkey_start_offset(k.k) << 9),972						k.k->p.offset << 9, 0, false);973 974				if (next_hole < k.k->p.offset << 9)975					break;976			} else {977				offset = max(offset, bkey_start_offset(k.k) << 9);978			}979			0;980		})));981	if (ret)982		return ret;983 984	if (next_hole > isize)985		next_hole = isize;986 987	return vfs_setpos(file, next_hole, MAX_LFS_FILESIZE);988}989 990loff_t bch2_llseek(struct file *file, loff_t offset, int whence)991{992	loff_t ret;993 994	switch (whence) {995	case SEEK_SET:996	case SEEK_CUR:997	case SEEK_END:998		ret = generic_file_llseek(file, offset, whence);999		break;1000	case SEEK_DATA:1001		ret = bch2_seek_data(file, offset);1002		break;1003	case SEEK_HOLE:1004		ret = bch2_seek_hole(file, offset);1005		break;1006	default:1007		ret = -EINVAL;1008		break;1009	}1010 1011	return bch2_err_class(ret);1012}1013 1014void bch2_fs_fsio_exit(struct bch_fs *c)1015{1016	bioset_exit(&c->nocow_flush_bioset);1017}1018 1019int bch2_fs_fsio_init(struct bch_fs *c)1020{1021	if (bioset_init(&c->nocow_flush_bioset,1022			1, offsetof(struct nocow_flush, bio), 0))1023		return -BCH_ERR_ENOMEM_nocow_flush_bioset_init;1024 1025	return 0;1026}1027 1028#endif /* NO_BCACHEFS_FS */1029