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-rw-r--r--fs/bcachefs/fs-io.c1072
1 files changed, 1072 insertions, 0 deletions
diff --git a/fs/bcachefs/fs-io.c b/fs/bcachefs/fs-io.c
new file mode 100644
index 0000000000..fffa1743df
--- /dev/null
+++ b/fs/bcachefs/fs-io.c
@@ -0,0 +1,1072 @@
+// SPDX-License-Identifier: GPL-2.0
+#ifndef NO_BCACHEFS_FS
+
+#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 "fs.h"
+#include "fs-io.h"
+#include "fs-io-buffered.h"
+#include "fs-io-pagecache.h"
+#include "fsck.h"
+#include "inode.h"
+#include "journal.h"
+#include "io_misc.h"
+#include "keylist.h"
+#include "quota.h"
+#include "reflink.h"
+#include "trace.h"
+
+#include <linux/aio.h>
+#include <linux/backing-dev.h>
+#include <linux/falloc.h>
+#include <linux/migrate.h>
+#include <linux/mmu_context.h>
+#include <linux/pagevec.h>
+#include <linux/rmap.h>
+#include <linux/sched/signal.h>
+#include <linux/task_io_accounting_ops.h>
+#include <linux/uio.h>
+
+#include <trace/events/writeback.h>
+
+struct nocow_flush {
+ struct closure *cl;
+ struct bch_dev *ca;
+ struct bio bio;
+};
+
+static void nocow_flush_endio(struct bio *_bio)
+{
+
+ struct nocow_flush *bio = container_of(_bio, struct nocow_flush, bio);
+
+ closure_put(bio->cl);
+ percpu_ref_put(&bio->ca->io_ref);
+ bio_put(&bio->bio);
+}
+
+void bch2_inode_flush_nocow_writes_async(struct bch_fs *c,
+ struct bch_inode_info *inode,
+ struct closure *cl)
+{
+ struct nocow_flush *bio;
+ struct bch_dev *ca;
+ struct bch_devs_mask devs;
+ unsigned dev;
+
+ dev = find_first_bit(inode->ei_devs_need_flush.d, BCH_SB_MEMBERS_MAX);
+ if (dev == BCH_SB_MEMBERS_MAX)
+ return;
+
+ devs = inode->ei_devs_need_flush;
+ memset(&inode->ei_devs_need_flush, 0, sizeof(inode->ei_devs_need_flush));
+
+ for_each_set_bit(dev, devs.d, BCH_SB_MEMBERS_MAX) {
+ rcu_read_lock();
+ ca = rcu_dereference(c->devs[dev]);
+ if (ca && !percpu_ref_tryget(&ca->io_ref))
+ ca = NULL;
+ rcu_read_unlock();
+
+ if (!ca)
+ continue;
+
+ bio = container_of(bio_alloc_bioset(ca->disk_sb.bdev, 0,
+ REQ_OP_WRITE|REQ_PREFLUSH,
+ GFP_KERNEL,
+ &c->nocow_flush_bioset),
+ struct nocow_flush, bio);
+ bio->cl = cl;
+ bio->ca = ca;
+ bio->bio.bi_end_io = nocow_flush_endio;
+ closure_bio_submit(&bio->bio, cl);
+ }
+}
+
+static int bch2_inode_flush_nocow_writes(struct bch_fs *c,
+ struct bch_inode_info *inode)
+{
+ struct closure cl;
+
+ closure_init_stack(&cl);
+ bch2_inode_flush_nocow_writes_async(c, inode, &cl);
+ closure_sync(&cl);
+
+ return 0;
+}
+
+/* i_size updates: */
+
+struct inode_new_size {
+ loff_t new_size;
+ u64 now;
+ unsigned fields;
+};
+
+static int inode_set_size(struct btree_trans *trans,
+ struct bch_inode_info *inode,
+ struct bch_inode_unpacked *bi,
+ void *p)
+{
+ struct inode_new_size *s = p;
+
+ bi->bi_size = s->new_size;
+ if (s->fields & ATTR_ATIME)
+ bi->bi_atime = s->now;
+ if (s->fields & ATTR_MTIME)
+ bi->bi_mtime = s->now;
+ if (s->fields & ATTR_CTIME)
+ bi->bi_ctime = s->now;
+
+ return 0;
+}
+
+int __must_check bch2_write_inode_size(struct bch_fs *c,
+ struct bch_inode_info *inode,
+ loff_t new_size, unsigned fields)
+{
+ struct inode_new_size s = {
+ .new_size = new_size,
+ .now = bch2_current_time(c),
+ .fields = fields,
+ };
+
+ return bch2_write_inode(c, inode, inode_set_size, &s, fields);
+}
+
+void __bch2_i_sectors_acct(struct bch_fs *c, struct bch_inode_info *inode,
+ struct quota_res *quota_res, s64 sectors)
+{
+ bch2_fs_inconsistent_on((s64) inode->v.i_blocks + sectors < 0, c,
+ "inode %lu i_blocks underflow: %llu + %lli < 0 (ondisk %lli)",
+ inode->v.i_ino, (u64) inode->v.i_blocks, sectors,
+ inode->ei_inode.bi_sectors);
+ inode->v.i_blocks += sectors;
+
+#ifdef CONFIG_BCACHEFS_QUOTA
+ if (quota_res &&
+ !test_bit(EI_INODE_SNAPSHOT, &inode->ei_flags) &&
+ sectors > 0) {
+ BUG_ON(sectors > quota_res->sectors);
+ BUG_ON(sectors > inode->ei_quota_reserved);
+
+ quota_res->sectors -= sectors;
+ inode->ei_quota_reserved -= sectors;
+ } else {
+ bch2_quota_acct(c, inode->ei_qid, Q_SPC, sectors, KEY_TYPE_QUOTA_WARN);
+ }
+#endif
+}
+
+/* fsync: */
+
+/*
+ * inode->ei_inode.bi_journal_seq won't be up to date since it's set in an
+ * insert trigger: look up the btree inode instead
+ */
+static int bch2_flush_inode(struct bch_fs *c,
+ struct bch_inode_info *inode)
+{
+ struct bch_inode_unpacked u;
+ int ret;
+
+ if (c->opts.journal_flush_disabled)
+ return 0;
+
+ ret = bch2_inode_find_by_inum(c, inode_inum(inode), &u);
+ if (ret)
+ return ret;
+
+ return bch2_journal_flush_seq(&c->journal, u.bi_journal_seq) ?:
+ bch2_inode_flush_nocow_writes(c, inode);
+}
+
+int bch2_fsync(struct file *file, loff_t start, loff_t end, int datasync)
+{
+ struct bch_inode_info *inode = file_bch_inode(file);
+ struct bch_fs *c = inode->v.i_sb->s_fs_info;
+ int ret, ret2, ret3;
+
+ ret = file_write_and_wait_range(file, start, end);
+ ret2 = sync_inode_metadata(&inode->v, 1);
+ ret3 = bch2_flush_inode(c, inode);
+
+ return bch2_err_class(ret ?: ret2 ?: ret3);
+}
+
+/* truncate: */
+
+static inline int range_has_data(struct bch_fs *c, u32 subvol,
+ struct bpos start,
+ struct bpos end)
+{
+ struct btree_trans *trans = bch2_trans_get(c);
+ struct btree_iter iter;
+ struct bkey_s_c k;
+ int ret = 0;
+retry:
+ bch2_trans_begin(trans);
+
+ ret = bch2_subvolume_get_snapshot(trans, subvol, &start.snapshot);
+ if (ret)
+ goto err;
+
+ for_each_btree_key_upto_norestart(trans, iter, BTREE_ID_extents, start, end, 0, k, ret)
+ if (bkey_extent_is_data(k.k) && !bkey_extent_is_unwritten(k)) {
+ ret = 1;
+ break;
+ }
+ start = iter.pos;
+ bch2_trans_iter_exit(trans, &iter);
+err:
+ if (bch2_err_matches(ret, BCH_ERR_transaction_restart))
+ goto retry;
+
+ bch2_trans_put(trans);
+ return ret;
+}
+
+static int __bch2_truncate_folio(struct bch_inode_info *inode,
+ pgoff_t index, loff_t start, loff_t end)
+{
+ struct bch_fs *c = inode->v.i_sb->s_fs_info;
+ struct address_space *mapping = inode->v.i_mapping;
+ struct bch_folio *s;
+ unsigned start_offset;
+ unsigned end_offset;
+ unsigned i;
+ struct folio *folio;
+ s64 i_sectors_delta = 0;
+ int ret = 0;
+ u64 end_pos;
+
+ folio = filemap_lock_folio(mapping, index);
+ if (IS_ERR_OR_NULL(folio)) {
+ /*
+ * XXX: we're doing two index lookups when we end up reading the
+ * folio
+ */
+ ret = range_has_data(c, inode->ei_subvol,
+ POS(inode->v.i_ino, (index << PAGE_SECTORS_SHIFT)),
+ POS(inode->v.i_ino, (index << PAGE_SECTORS_SHIFT) + PAGE_SECTORS));
+ if (ret <= 0)
+ return ret;
+
+ folio = __filemap_get_folio(mapping, index,
+ FGP_LOCK|FGP_CREAT, GFP_KERNEL);
+ if (IS_ERR_OR_NULL(folio)) {
+ ret = -ENOMEM;
+ goto out;
+ }
+ }
+
+ BUG_ON(start >= folio_end_pos(folio));
+ BUG_ON(end <= folio_pos(folio));
+
+ start_offset = max(start, folio_pos(folio)) - folio_pos(folio);
+ end_offset = min_t(u64, end, folio_end_pos(folio)) - folio_pos(folio);
+
+ /* Folio boundary? Nothing to do */
+ if (start_offset == 0 &&
+ end_offset == folio_size(folio)) {
+ ret = 0;
+ goto unlock;
+ }
+
+ s = bch2_folio_create(folio, 0);
+ if (!s) {
+ ret = -ENOMEM;
+ goto unlock;
+ }
+
+ if (!folio_test_uptodate(folio)) {
+ ret = bch2_read_single_folio(folio, mapping);
+ if (ret)
+ goto unlock;
+ }
+
+ ret = bch2_folio_set(c, inode_inum(inode), &folio, 1);
+ if (ret)
+ goto unlock;
+
+ for (i = round_up(start_offset, block_bytes(c)) >> 9;
+ i < round_down(end_offset, block_bytes(c)) >> 9;
+ i++) {
+ s->s[i].nr_replicas = 0;
+
+ i_sectors_delta -= s->s[i].state == SECTOR_dirty;
+ bch2_folio_sector_set(folio, s, i, SECTOR_unallocated);
+ }
+
+ bch2_i_sectors_acct(c, inode, NULL, i_sectors_delta);
+
+ /*
+ * Caller needs to know whether this folio will be written out by
+ * writeback - doing an i_size update if necessary - or whether it will
+ * be responsible for the i_size update.
+ *
+ * Note that we shouldn't ever see a folio beyond EOF, but check and
+ * warn if so. This has been observed by failure to clean up folios
+ * after a short write and there's still a chance reclaim will fix
+ * things up.
+ */
+ WARN_ON_ONCE(folio_pos(folio) >= inode->v.i_size);
+ end_pos = folio_end_pos(folio);
+ if (inode->v.i_size > folio_pos(folio))
+ end_pos = min_t(u64, inode->v.i_size, end_pos);
+ ret = s->s[folio_pos_to_s(folio, end_pos - 1)].state >= SECTOR_dirty;
+
+ folio_zero_segment(folio, start_offset, end_offset);
+
+ /*
+ * Bit of a hack - we don't want truncate to fail due to -ENOSPC.
+ *
+ * XXX: because we aren't currently tracking whether the folio has actual
+ * data in it (vs. just 0s, or only partially written) this wrong. ick.
+ */
+ BUG_ON(bch2_get_folio_disk_reservation(c, inode, folio, false));
+
+ /*
+ * This removes any writeable userspace mappings; we need to force
+ * .page_mkwrite to be called again before any mmapped writes, to
+ * redirty the full page:
+ */
+ folio_mkclean(folio);
+ filemap_dirty_folio(mapping, folio);
+unlock:
+ folio_unlock(folio);
+ folio_put(folio);
+out:
+ return ret;
+}
+
+static int bch2_truncate_folio(struct bch_inode_info *inode, loff_t from)
+{
+ return __bch2_truncate_folio(inode, from >> PAGE_SHIFT,
+ from, ANYSINT_MAX(loff_t));
+}
+
+static int bch2_truncate_folios(struct bch_inode_info *inode,
+ loff_t start, loff_t end)
+{
+ int ret = __bch2_truncate_folio(inode, start >> PAGE_SHIFT,
+ start, end);
+
+ if (ret >= 0 &&
+ start >> PAGE_SHIFT != end >> PAGE_SHIFT)
+ ret = __bch2_truncate_folio(inode,
+ (end - 1) >> PAGE_SHIFT,
+ start, end);
+ return ret;
+}
+
+static int bch2_extend(struct mnt_idmap *idmap,
+ struct bch_inode_info *inode,
+ struct bch_inode_unpacked *inode_u,
+ struct iattr *iattr)
+{
+ struct address_space *mapping = inode->v.i_mapping;
+ int ret;
+
+ /*
+ * sync appends:
+ *
+ * this has to be done _before_ extending i_size:
+ */
+ ret = filemap_write_and_wait_range(mapping, inode_u->bi_size, S64_MAX);
+ if (ret)
+ return ret;
+
+ truncate_setsize(&inode->v, iattr->ia_size);
+
+ return bch2_setattr_nonsize(idmap, inode, iattr);
+}
+
+int bchfs_truncate(struct mnt_idmap *idmap,
+ struct bch_inode_info *inode, struct iattr *iattr)
+{
+ struct bch_fs *c = inode->v.i_sb->s_fs_info;
+ struct address_space *mapping = inode->v.i_mapping;
+ struct bch_inode_unpacked inode_u;
+ s64 i_sectors_delta = 0;
+ int ret = 0;
+
+ /*
+ * If the truncate call with change the size of the file, the
+ * cmtimes should be updated. If the size will not change, we
+ * do not need to update the cmtimes.
+ */
+ if (iattr->ia_size != inode->v.i_size) {
+ if (!(iattr->ia_valid & ATTR_MTIME))
+ ktime_get_coarse_real_ts64(&iattr->ia_mtime);
+ if (!(iattr->ia_valid & ATTR_CTIME))
+ ktime_get_coarse_real_ts64(&iattr->ia_ctime);
+ iattr->ia_valid |= ATTR_MTIME|ATTR_CTIME;
+ }
+
+ inode_dio_wait(&inode->v);
+ bch2_pagecache_block_get(inode);
+
+ ret = bch2_inode_find_by_inum(c, inode_inum(inode), &inode_u);
+ if (ret)
+ goto err;
+
+ /*
+ * check this before next assertion; on filesystem error our normal
+ * invariants are a bit broken (truncate has to truncate the page cache
+ * before the inode).
+ */
+ ret = bch2_journal_error(&c->journal);
+ if (ret)
+ goto err;
+
+ WARN_ONCE(!test_bit(EI_INODE_ERROR, &inode->ei_flags) &&
+ inode->v.i_size < inode_u.bi_size,
+ "truncate spotted in mem i_size < btree i_size: %llu < %llu\n",
+ (u64) inode->v.i_size, inode_u.bi_size);
+
+ if (iattr->ia_size > inode->v.i_size) {
+ ret = bch2_extend(idmap, inode, &inode_u, iattr);
+ goto err;
+ }
+
+ iattr->ia_valid &= ~ATTR_SIZE;
+
+ ret = bch2_truncate_folio(inode, iattr->ia_size);
+ if (unlikely(ret < 0))
+ goto err;
+
+ truncate_setsize(&inode->v, iattr->ia_size);
+
+ /*
+ * When extending, we're going to write the new i_size to disk
+ * immediately so we need to flush anything above the current on disk
+ * i_size first:
+ *
+ * Also, when extending we need to flush the page that i_size currently
+ * straddles - if it's mapped to userspace, we need to ensure that
+ * userspace has to redirty it and call .mkwrite -> set_page_dirty
+ * again to allocate the part of the page that was extended.
+ */
+ if (iattr->ia_size > inode_u.bi_size)
+ ret = filemap_write_and_wait_range(mapping,
+ inode_u.bi_size,
+ iattr->ia_size - 1);
+ else if (iattr->ia_size & (PAGE_SIZE - 1))
+ ret = filemap_write_and_wait_range(mapping,
+ round_down(iattr->ia_size, PAGE_SIZE),
+ iattr->ia_size - 1);
+ if (ret)
+ goto err;
+
+ ret = bch2_truncate(c, inode_inum(inode), iattr->ia_size, &i_sectors_delta);
+ bch2_i_sectors_acct(c, inode, NULL, i_sectors_delta);
+
+ if (unlikely(ret)) {
+ /*
+ * If we error here, VFS caches are now inconsistent with btree
+ */
+ set_bit(EI_INODE_ERROR, &inode->ei_flags);
+ goto err;
+ }
+
+ bch2_fs_inconsistent_on(!inode->v.i_size && inode->v.i_blocks &&
+ !bch2_journal_error(&c->journal), c,
+ "inode %lu truncated to 0 but i_blocks %llu (ondisk %lli)",
+ inode->v.i_ino, (u64) inode->v.i_blocks,
+ inode->ei_inode.bi_sectors);
+
+ ret = bch2_setattr_nonsize(idmap, inode, iattr);
+err:
+ bch2_pagecache_block_put(inode);
+ return bch2_err_class(ret);
+}
+
+/* fallocate: */
+
+static int inode_update_times_fn(struct btree_trans *trans,
+ struct bch_inode_info *inode,
+ struct bch_inode_unpacked *bi, void *p)
+{
+ struct bch_fs *c = inode->v.i_sb->s_fs_info;
+
+ bi->bi_mtime = bi->bi_ctime = bch2_current_time(c);
+ return 0;
+}
+
+static long bchfs_fpunch(struct bch_inode_info *inode, loff_t offset, loff_t len)
+{
+ struct bch_fs *c = inode->v.i_sb->s_fs_info;
+ u64 end = offset + len;
+ u64 block_start = round_up(offset, block_bytes(c));
+ u64 block_end = round_down(end, block_bytes(c));
+ bool truncated_last_page;
+ int ret = 0;
+
+ ret = bch2_truncate_folios(inode, offset, end);
+ if (unlikely(ret < 0))
+ goto err;
+
+ truncated_last_page = ret;
+
+ truncate_pagecache_range(&inode->v, offset, end - 1);
+
+ if (block_start < block_end) {
+ s64 i_sectors_delta = 0;
+
+ ret = bch2_fpunch(c, inode_inum(inode),
+ block_start >> 9, block_end >> 9,
+ &i_sectors_delta);
+ bch2_i_sectors_acct(c, inode, NULL, i_sectors_delta);
+ }
+
+ mutex_lock(&inode->ei_update_lock);
+ if (end >= inode->v.i_size && !truncated_last_page) {
+ ret = bch2_write_inode_size(c, inode, inode->v.i_size,
+ ATTR_MTIME|ATTR_CTIME);
+ } else {
+ ret = bch2_write_inode(c, inode, inode_update_times_fn, NULL,
+ ATTR_MTIME|ATTR_CTIME);
+ }
+ mutex_unlock(&inode->ei_update_lock);
+err:
+ return ret;
+}
+
+static long bchfs_fcollapse_finsert(struct bch_inode_info *inode,
+ loff_t offset, loff_t len,
+ bool insert)
+{
+ struct bch_fs *c = inode->v.i_sb->s_fs_info;
+ struct address_space *mapping = inode->v.i_mapping;
+ s64 i_sectors_delta = 0;
+ int ret = 0;
+
+ if ((offset | len) & (block_bytes(c) - 1))
+ return -EINVAL;
+
+ if (insert) {
+ if (offset >= inode->v.i_size)
+ return -EINVAL;
+ } else {
+ if (offset + len >= inode->v.i_size)
+ return -EINVAL;
+ }
+
+ ret = bch2_write_invalidate_inode_pages_range(mapping, offset, LLONG_MAX);
+ if (ret)
+ return ret;
+
+ if (insert)
+ i_size_write(&inode->v, inode->v.i_size + len);
+
+ ret = bch2_fcollapse_finsert(c, inode_inum(inode), offset >> 9, len >> 9,
+ insert, &i_sectors_delta);
+ if (!ret && !insert)
+ i_size_write(&inode->v, inode->v.i_size - len);
+ bch2_i_sectors_acct(c, inode, NULL, i_sectors_delta);
+
+ return ret;
+}
+
+static int __bchfs_fallocate(struct bch_inode_info *inode, int mode,
+ u64 start_sector, u64 end_sector)
+{
+ struct bch_fs *c = inode->v.i_sb->s_fs_info;
+ struct btree_trans *trans = bch2_trans_get(c);
+ struct btree_iter iter;
+ struct bpos end_pos = POS(inode->v.i_ino, end_sector);
+ struct bch_io_opts opts;
+ int ret = 0;
+
+ bch2_inode_opts_get(&opts, c, &inode->ei_inode);
+
+ bch2_trans_iter_init(trans, &iter, BTREE_ID_extents,
+ POS(inode->v.i_ino, start_sector),
+ BTREE_ITER_SLOTS|BTREE_ITER_INTENT);
+
+ while (!ret && bkey_lt(iter.pos, end_pos)) {
+ s64 i_sectors_delta = 0;
+ struct quota_res quota_res = { 0 };
+ struct bkey_s_c k;
+ unsigned sectors;
+ bool is_allocation;
+ u64 hole_start, hole_end;
+ u32 snapshot;
+
+ bch2_trans_begin(trans);
+
+ ret = bch2_subvolume_get_snapshot(trans,
+ inode->ei_subvol, &snapshot);
+ if (ret)
+ goto bkey_err;
+
+ bch2_btree_iter_set_snapshot(&iter, snapshot);
+
+ k = bch2_btree_iter_peek_slot(&iter);
+ if ((ret = bkey_err(k)))
+ goto bkey_err;
+
+ hole_start = iter.pos.offset;
+ hole_end = bpos_min(k.k->p, end_pos).offset;
+ is_allocation = bkey_extent_is_allocation(k.k);
+
+ /* already reserved */
+ if (bkey_extent_is_reservation(k) &&
+ bch2_bkey_nr_ptrs_fully_allocated(k) >= opts.data_replicas) {
+ bch2_btree_iter_advance(&iter);
+ continue;
+ }
+
+ if (bkey_extent_is_data(k.k) &&
+ !(mode & FALLOC_FL_ZERO_RANGE)) {
+ bch2_btree_iter_advance(&iter);
+ continue;
+ }
+
+ if (!(mode & FALLOC_FL_ZERO_RANGE)) {
+ /*
+ * Lock ordering - can't be holding btree locks while
+ * blocking on a folio lock:
+ */
+ if (bch2_clamp_data_hole(&inode->v,
+ &hole_start,
+ &hole_end,
+ opts.data_replicas, true))
+ ret = drop_locks_do(trans,
+ (bch2_clamp_data_hole(&inode->v,
+ &hole_start,
+ &hole_end,
+ opts.data_replicas, false), 0));
+ bch2_btree_iter_set_pos(&iter, POS(iter.pos.inode, hole_start));
+
+ if (ret)
+ goto bkey_err;
+
+ if (hole_start == hole_end)
+ continue;
+ }
+
+ sectors = hole_end - hole_start;
+
+ if (!is_allocation) {
+ ret = bch2_quota_reservation_add(c, inode,
+ &quota_res, sectors, true);
+ if (unlikely(ret))
+ goto bkey_err;
+ }
+
+ ret = bch2_extent_fallocate(trans, inode_inum(inode), &iter,
+ sectors, opts, &i_sectors_delta,
+ writepoint_hashed((unsigned long) current));
+ if (ret)
+ goto bkey_err;
+
+ bch2_i_sectors_acct(c, inode, &quota_res, i_sectors_delta);
+
+ drop_locks_do(trans,
+ (bch2_mark_pagecache_reserved(inode, hole_start, iter.pos.offset), 0));
+bkey_err:
+ bch2_quota_reservation_put(c, inode, &quota_res);
+ if (bch2_err_matches(ret, BCH_ERR_transaction_restart))
+ ret = 0;
+ }
+
+ if (bch2_err_matches(ret, ENOSPC) && (mode & FALLOC_FL_ZERO_RANGE)) {
+ struct quota_res quota_res = { 0 };
+ s64 i_sectors_delta = 0;
+
+ bch2_fpunch_at(trans, &iter, inode_inum(inode),
+ end_sector, &i_sectors_delta);
+ bch2_i_sectors_acct(c, inode, &quota_res, i_sectors_delta);
+ bch2_quota_reservation_put(c, inode, &quota_res);
+ }
+
+ bch2_trans_iter_exit(trans, &iter);
+ bch2_trans_put(trans);
+ return ret;
+}
+
+static long bchfs_fallocate(struct bch_inode_info *inode, int mode,
+ loff_t offset, loff_t len)
+{
+ struct bch_fs *c = inode->v.i_sb->s_fs_info;
+ u64 end = offset + len;
+ u64 block_start = round_down(offset, block_bytes(c));
+ u64 block_end = round_up(end, block_bytes(c));
+ bool truncated_last_page = false;
+ int ret, ret2 = 0;
+
+ if (!(mode & FALLOC_FL_KEEP_SIZE) && end > inode->v.i_size) {
+ ret = inode_newsize_ok(&inode->v, end);
+ if (ret)
+ return ret;
+ }
+
+ if (mode & FALLOC_FL_ZERO_RANGE) {
+ ret = bch2_truncate_folios(inode, offset, end);
+ if (unlikely(ret < 0))
+ return ret;
+
+ truncated_last_page = ret;
+
+ truncate_pagecache_range(&inode->v, offset, end - 1);
+
+ block_start = round_up(offset, block_bytes(c));
+ block_end = round_down(end, block_bytes(c));
+ }
+
+ ret = __bchfs_fallocate(inode, mode, block_start >> 9, block_end >> 9);
+
+ /*
+ * On -ENOSPC in ZERO_RANGE mode, we still want to do the inode update,
+ * so that the VFS cache i_size is consistent with the btree i_size:
+ */
+ if (ret &&
+ !(bch2_err_matches(ret, ENOSPC) && (mode & FALLOC_FL_ZERO_RANGE)))
+ return ret;
+
+ if (mode & FALLOC_FL_KEEP_SIZE && end > inode->v.i_size)
+ end = inode->v.i_size;
+
+ if (end >= inode->v.i_size &&
+ (((mode & FALLOC_FL_ZERO_RANGE) && !truncated_last_page) ||
+ !(mode & FALLOC_FL_KEEP_SIZE))) {
+ spin_lock(&inode->v.i_lock);
+ i_size_write(&inode->v, end);
+ spin_unlock(&inode->v.i_lock);
+
+ mutex_lock(&inode->ei_update_lock);
+ ret2 = bch2_write_inode_size(c, inode, end, 0);
+ mutex_unlock(&inode->ei_update_lock);
+ }
+
+ return ret ?: ret2;
+}
+
+long bch2_fallocate_dispatch(struct file *file, int mode,
+ loff_t offset, loff_t len)
+{
+ struct bch_inode_info *inode = file_bch_inode(file);
+ struct bch_fs *c = inode->v.i_sb->s_fs_info;
+ long ret;
+
+ if (!bch2_write_ref_tryget(c, BCH_WRITE_REF_fallocate))
+ return -EROFS;
+
+ inode_lock(&inode->v);
+ inode_dio_wait(&inode->v);
+ bch2_pagecache_block_get(inode);
+
+ ret = file_modified(file);
+ if (ret)
+ goto err;
+
+ if (!(mode & ~(FALLOC_FL_KEEP_SIZE|FALLOC_FL_ZERO_RANGE)))
+ ret = bchfs_fallocate(inode, mode, offset, len);
+ else if (mode == (FALLOC_FL_PUNCH_HOLE|FALLOC_FL_KEEP_SIZE))
+ ret = bchfs_fpunch(inode, offset, len);
+ else if (mode == FALLOC_FL_INSERT_RANGE)
+ ret = bchfs_fcollapse_finsert(inode, offset, len, true);
+ else if (mode == FALLOC_FL_COLLAPSE_RANGE)
+ ret = bchfs_fcollapse_finsert(inode, offset, len, false);
+ else
+ ret = -EOPNOTSUPP;
+err:
+ bch2_pagecache_block_put(inode);
+ inode_unlock(&inode->v);
+ bch2_write_ref_put(c, BCH_WRITE_REF_fallocate);
+
+ return bch2_err_class(ret);
+}
+
+/*
+ * Take a quota reservation for unallocated blocks in a given file range
+ * Does not check pagecache
+ */
+static int quota_reserve_range(struct bch_inode_info *inode,
+ struct quota_res *res,
+ u64 start, u64 end)
+{
+ struct bch_fs *c = inode->v.i_sb->s_fs_info;
+ struct btree_trans *trans = bch2_trans_get(c);
+ struct btree_iter iter;
+ struct bkey_s_c k;
+ u32 snapshot;
+ u64 sectors = end - start;
+ u64 pos = start;
+ int ret;
+retry:
+ bch2_trans_begin(trans);
+
+ ret = bch2_subvolume_get_snapshot(trans, inode->ei_subvol, &snapshot);
+ if (ret)
+ goto err;
+
+ bch2_trans_iter_init(trans, &iter, BTREE_ID_extents,
+ SPOS(inode->v.i_ino, pos, snapshot), 0);
+
+ while (!(ret = btree_trans_too_many_iters(trans)) &&
+ (k = bch2_btree_iter_peek_upto(&iter, POS(inode->v.i_ino, end - 1))).k &&
+ !(ret = bkey_err(k))) {
+ if (bkey_extent_is_allocation(k.k)) {
+ u64 s = min(end, k.k->p.offset) -
+ max(start, bkey_start_offset(k.k));
+ BUG_ON(s > sectors);
+ sectors -= s;
+ }
+ bch2_btree_iter_advance(&iter);
+ }
+ pos = iter.pos.offset;
+ bch2_trans_iter_exit(trans, &iter);
+err:
+ if (bch2_err_matches(ret, BCH_ERR_transaction_restart))
+ goto retry;
+
+ bch2_trans_put(trans);
+
+ return ret ?: bch2_quota_reservation_add(c, inode, res, sectors, true);
+}
+
+loff_t bch2_remap_file_range(struct file *file_src, loff_t pos_src,
+ struct file *file_dst, loff_t pos_dst,
+ loff_t len, unsigned remap_flags)
+{
+ struct bch_inode_info *src = file_bch_inode(file_src);
+ struct bch_inode_info *dst = file_bch_inode(file_dst);
+ struct bch_fs *c = src->v.i_sb->s_fs_info;
+ struct quota_res quota_res = { 0 };
+ s64 i_sectors_delta = 0;
+ u64 aligned_len;
+ loff_t ret = 0;
+
+ if (remap_flags & ~(REMAP_FILE_DEDUP|REMAP_FILE_ADVISORY))
+ return -EINVAL;
+
+ if (remap_flags & REMAP_FILE_DEDUP)
+ return -EOPNOTSUPP;
+
+ if ((pos_src & (block_bytes(c) - 1)) ||
+ (pos_dst & (block_bytes(c) - 1)))
+ return -EINVAL;
+
+ if (src == dst &&
+ abs(pos_src - pos_dst) < len)
+ return -EINVAL;
+
+ bch2_lock_inodes(INODE_LOCK|INODE_PAGECACHE_BLOCK, src, dst);
+
+ inode_dio_wait(&src->v);
+ inode_dio_wait(&dst->v);
+
+ ret = generic_remap_file_range_prep(file_src, pos_src,
+ file_dst, pos_dst,
+ &len, remap_flags);
+ if (ret < 0 || len == 0)
+ goto err;
+
+ aligned_len = round_up((u64) len, block_bytes(c));
+
+ ret = bch2_write_invalidate_inode_pages_range(dst->v.i_mapping,
+ pos_dst, pos_dst + len - 1);
+ if (ret)
+ goto err;
+
+ ret = quota_reserve_range(dst, &quota_res, pos_dst >> 9,
+ (pos_dst + aligned_len) >> 9);
+ if (ret)
+ goto err;
+
+ file_update_time(file_dst);
+
+ bch2_mark_pagecache_unallocated(src, pos_src >> 9,
+ (pos_src + aligned_len) >> 9);
+
+ ret = bch2_remap_range(c,
+ inode_inum(dst), pos_dst >> 9,
+ inode_inum(src), pos_src >> 9,
+ aligned_len >> 9,
+ pos_dst + len, &i_sectors_delta);
+ if (ret < 0)
+ goto err;
+
+ /*
+ * due to alignment, we might have remapped slightly more than requsted
+ */
+ ret = min((u64) ret << 9, (u64) len);
+
+ bch2_i_sectors_acct(c, dst, &quota_res, i_sectors_delta);
+
+ spin_lock(&dst->v.i_lock);
+ if (pos_dst + ret > dst->v.i_size)
+ i_size_write(&dst->v, pos_dst + ret);
+ spin_unlock(&dst->v.i_lock);
+
+ if ((file_dst->f_flags & (__O_SYNC | O_DSYNC)) ||
+ IS_SYNC(file_inode(file_dst)))
+ ret = bch2_flush_inode(c, dst);
+err:
+ bch2_quota_reservation_put(c, dst, &quota_res);
+ bch2_unlock_inodes(INODE_LOCK|INODE_PAGECACHE_BLOCK, src, dst);
+
+ return bch2_err_class(ret);
+}
+
+/* fseek: */
+
+static loff_t bch2_seek_data(struct file *file, u64 offset)
+{
+ struct bch_inode_info *inode = file_bch_inode(file);
+ struct bch_fs *c = inode->v.i_sb->s_fs_info;
+ struct btree_trans *trans;
+ struct btree_iter iter;
+ struct bkey_s_c k;
+ subvol_inum inum = inode_inum(inode);
+ u64 isize, next_data = MAX_LFS_FILESIZE;
+ u32 snapshot;
+ int ret;
+
+ isize = i_size_read(&inode->v);
+ if (offset >= isize)
+ return -ENXIO;
+
+ trans = bch2_trans_get(c);
+retry:
+ bch2_trans_begin(trans);
+
+ ret = bch2_subvolume_get_snapshot(trans, inum.subvol, &snapshot);
+ if (ret)
+ goto err;
+
+ for_each_btree_key_upto_norestart(trans, iter, BTREE_ID_extents,
+ SPOS(inode->v.i_ino, offset >> 9, snapshot),
+ POS(inode->v.i_ino, U64_MAX),
+ 0, k, ret) {
+ if (bkey_extent_is_data(k.k)) {
+ next_data = max(offset, bkey_start_offset(k.k) << 9);
+ break;
+ } else if (k.k->p.offset >> 9 > isize)
+ break;
+ }
+ bch2_trans_iter_exit(trans, &iter);
+err:
+ if (bch2_err_matches(ret, BCH_ERR_transaction_restart))
+ goto retry;
+
+ bch2_trans_put(trans);
+ if (ret)
+ return ret;
+
+ if (next_data > offset)
+ next_data = bch2_seek_pagecache_data(&inode->v,
+ offset, next_data, 0, false);
+
+ if (next_data >= isize)
+ return -ENXIO;
+
+ return vfs_setpos(file, next_data, MAX_LFS_FILESIZE);
+}
+
+static loff_t bch2_seek_hole(struct file *file, u64 offset)
+{
+ struct bch_inode_info *inode = file_bch_inode(file);
+ struct bch_fs *c = inode->v.i_sb->s_fs_info;
+ struct btree_trans *trans;
+ struct btree_iter iter;
+ struct bkey_s_c k;
+ subvol_inum inum = inode_inum(inode);
+ u64 isize, next_hole = MAX_LFS_FILESIZE;
+ u32 snapshot;
+ int ret;
+
+ isize = i_size_read(&inode->v);
+ if (offset >= isize)
+ return -ENXIO;
+
+ trans = bch2_trans_get(c);
+retry:
+ bch2_trans_begin(trans);
+
+ ret = bch2_subvolume_get_snapshot(trans, inum.subvol, &snapshot);
+ if (ret)
+ goto err;
+
+ for_each_btree_key_norestart(trans, iter, BTREE_ID_extents,
+ SPOS(inode->v.i_ino, offset >> 9, snapshot),
+ BTREE_ITER_SLOTS, k, ret) {
+ if (k.k->p.inode != inode->v.i_ino) {
+ next_hole = bch2_seek_pagecache_hole(&inode->v,
+ offset, MAX_LFS_FILESIZE, 0, false);
+ break;
+ } else if (!bkey_extent_is_data(k.k)) {
+ next_hole = bch2_seek_pagecache_hole(&inode->v,
+ max(offset, bkey_start_offset(k.k) << 9),
+ k.k->p.offset << 9, 0, false);
+
+ if (next_hole < k.k->p.offset << 9)
+ break;
+ } else {
+ offset = max(offset, bkey_start_offset(k.k) << 9);
+ }
+ }
+ bch2_trans_iter_exit(trans, &iter);
+err:
+ if (bch2_err_matches(ret, BCH_ERR_transaction_restart))
+ goto retry;
+
+ bch2_trans_put(trans);
+ if (ret)
+ return ret;
+
+ if (next_hole > isize)
+ next_hole = isize;
+
+ return vfs_setpos(file, next_hole, MAX_LFS_FILESIZE);
+}
+
+loff_t bch2_llseek(struct file *file, loff_t offset, int whence)
+{
+ loff_t ret;
+
+ switch (whence) {
+ case SEEK_SET:
+ case SEEK_CUR:
+ case SEEK_END:
+ ret = generic_file_llseek(file, offset, whence);
+ break;
+ case SEEK_DATA:
+ ret = bch2_seek_data(file, offset);
+ break;
+ case SEEK_HOLE:
+ ret = bch2_seek_hole(file, offset);
+ break;
+ default:
+ ret = -EINVAL;
+ break;
+ }
+
+ return bch2_err_class(ret);
+}
+
+void bch2_fs_fsio_exit(struct bch_fs *c)
+{
+ bioset_exit(&c->nocow_flush_bioset);
+}
+
+int bch2_fs_fsio_init(struct bch_fs *c)
+{
+ if (bioset_init(&c->nocow_flush_bioset,
+ 1, offsetof(struct nocow_flush, bio), 0))
+ return -BCH_ERR_ENOMEM_nocow_flush_bioset_init;
+
+ return 0;
+}
+
+#endif /* NO_BCACHEFS_FS */