+++ /dev/null
-// 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);
- 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.background_target,
- opts.background_compression) ?:
- 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:
- 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;
-}
projects / bcachefs-tools-debian / blobdiff