// SPDX-License-Identifier: GPL-2.0
/*
- * Some low level IO code, and hacks for various block layer limitations
- *
* Copyright 2010, 2011 Kent Overstreet <kent.overstreet@gmail.com>
* Copyright 2012 Google, Inc.
*/
#include "bcachefs.h"
-#include "alloc_background.h"
#include "alloc_foreground.h"
#include "bkey_buf.h"
#include "bset.h"
#include "btree_update.h"
#include "buckets.h"
#include "checksum.h"
-#include "compress.h"
#include "clock.h"
-#include "data_update.h"
+#include "compress.h"
#include "debug.h"
-#include "disk_groups.h"
#include "ec.h"
#include "error.h"
#include "extent_update.h"
#include "inode.h"
-#include "io.h"
+#include "io_write.h"
#include "journal.h"
#include "keylist.h"
#include "move.h"
#include <linux/random.h>
#include <linux/sched/mm.h>
-const char *bch2_blk_status_to_str(blk_status_t status)
-{
- if (status == BLK_STS_REMOVED)
- return "device removed";
- return blk_status_to_str(status);
-}
-
#ifndef CONFIG_BCACHEFS_NO_LATENCY_ACCT
-static bool bch2_target_congested(struct bch_fs *c, u16 target)
-{
- const struct bch_devs_mask *devs;
- unsigned d, nr = 0, total = 0;
- u64 now = local_clock(), last;
- s64 congested;
- struct bch_dev *ca;
-
- if (!target)
- return false;
-
- rcu_read_lock();
- devs = bch2_target_to_mask(c, target) ?:
- &c->rw_devs[BCH_DATA_user];
-
- for_each_set_bit(d, devs->d, BCH_SB_MEMBERS_MAX) {
- ca = rcu_dereference(c->devs[d]);
- if (!ca)
- continue;
-
- congested = atomic_read(&ca->congested);
- last = READ_ONCE(ca->congested_last);
- if (time_after64(now, last))
- congested -= (now - last) >> 12;
-
- total += max(congested, 0LL);
- nr++;
- }
- rcu_read_unlock();
-
- return bch2_rand_range(nr * CONGESTED_MAX) < total;
-}
-
static inline void bch2_congested_acct(struct bch_dev *ca, u64 io_latency,
u64 now, int rw)
{
__bch2_time_stats_update(&ca->io_latency[rw], submit_time, now);
}
-#else
-
-static bool bch2_target_congested(struct bch_fs *c, u16 target)
-{
- return false;
-}
-
#endif
/* Allocate, free from mempool: */
return 0;
}
-/* Overwrites whatever was present with zeroes: */
-int bch2_extent_fallocate(struct btree_trans *trans,
- subvol_inum inum,
- struct btree_iter *iter,
- unsigned 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;
- bool have_reservation = false;
- 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);
-
- if (!have_reservation) {
- unsigned 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;
-
- bch2_bkey_buf_reassemble(&old, c, k);
- }
-
- if (have_reservation) {
- if (!bch2_extents_match(k, bkey_i_to_s_c(old.k)))
- goto err;
-
- bch2_key_resize(&new.k->k, sectors);
- } else 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;
- struct bch_extent_ptr *ptr;
-
- 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(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;
- }
-
- have_reservation = 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);
-
- 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;
- struct btree_iter iter;
- int ret;
-
- bch2_trans_init(&trans, c, BTREE_ITER_MAX, 1024);
- 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_exit(&trans);
-
- if (bch2_err_matches(ret, BCH_ERR_transaction_restart))
- ret = 0;
-
- return ret;
-}
-
static int bch2_write_index_default(struct bch_write_op *op)
{
struct bch_fs *c = op->c;
struct bkey_buf sk;
struct keylist *keys = &op->insert_keys;
struct bkey_i *k = bch2_keylist_front(keys);
- struct btree_trans trans;
+ struct btree_trans *trans = bch2_trans_get(c);
struct btree_iter iter;
subvol_inum inum = {
.subvol = op->subvol,
BUG_ON(!inum.subvol);
bch2_bkey_buf_init(&sk);
- bch2_trans_init(&trans, c, BTREE_ITER_MAX, 1024);
do {
- bch2_trans_begin(&trans);
+ bch2_trans_begin(trans);
k = bch2_keylist_front(keys);
bch2_bkey_buf_copy(&sk, c, k);
- ret = bch2_subvolume_get_snapshot(&trans, inum.subvol,
+ ret = bch2_subvolume_get_snapshot(trans, inum.subvol,
&sk.k->k.p.snapshot);
if (bch2_err_matches(ret, BCH_ERR_transaction_restart))
continue;
if (ret)
break;
- bch2_trans_iter_init(&trans, &iter, BTREE_ID_extents,
+ bch2_trans_iter_init(trans, &iter, BTREE_ID_extents,
bkey_start_pos(&sk.k->k),
BTREE_ITER_SLOTS|BTREE_ITER_INTENT);
- ret = bch2_extent_update(&trans, inum, &iter, sk.k,
+ ret = bch2_extent_update(trans, inum, &iter, sk.k,
&op->res,
op->new_i_size, &op->i_sectors_delta,
op->flags & BCH_WRITE_CHECK_ENOSPC);
- bch2_trans_iter_exit(&trans, &iter);
+ bch2_trans_iter_exit(trans, &iter);
if (bch2_err_matches(ret, BCH_ERR_transaction_restart))
continue;
bch2_cut_front(iter.pos, k);
} while (!bch2_keylist_empty(keys));
- bch2_trans_exit(&trans);
+ bch2_trans_put(trans);
bch2_bkey_buf_exit(&sk, c);
return ret;
}
/**
- * bch_write_index - after a write, update index to point to new data
+ * __bch2_write_index - after a write, update index to point to new data
+ * @op: bch_write_op to process
*/
static void __bch2_write_index(struct bch_write_op *op)
{
op->written += sectors_start - keylist_sectors(keys);
if (ret && !bch2_err_matches(ret, EROFS)) {
- struct bkey_i *k = bch2_keylist_front(&op->insert_keys);
+ struct bkey_i *insert = bch2_keylist_front(&op->insert_keys);
bch_err_inum_offset_ratelimited(c,
- k->k.p.inode, k->k.p.offset << 9,
+ insert->k.p.inode, insert->k.p.offset << 9,
"write error while doing btree update: %s",
bch2_err_str(ret));
}
do {
struct bch_extent_crc_unpacked crc = { 0 };
struct bversion version = op->version;
- size_t dst_len, src_len;
+ size_t dst_len = 0, src_len = 0;
if (page_alloc_failed &&
dst->bi_iter.bi_size < (wp->sectors_free << 9) &&
static void bch2_nocow_write_convert_unwritten(struct bch_write_op *op)
{
struct bch_fs *c = op->c;
- struct btree_trans trans;
+ struct btree_trans *trans = bch2_trans_get(c);
struct btree_iter iter;
struct bkey_i *orig;
struct bkey_s_c k;
int ret;
- bch2_trans_init(&trans, c, 0, 0);
-
for_each_keylist_key(&op->insert_keys, orig) {
- ret = for_each_btree_key_upto_commit(&trans, iter, BTREE_ID_extents,
+ ret = for_each_btree_key_upto_commit(trans, iter, BTREE_ID_extents,
bkey_start_pos(&orig->k), orig->k.p,
BTREE_ITER_INTENT, k,
NULL, NULL, BTREE_INSERT_NOFAIL, ({
- bch2_nocow_write_convert_one_unwritten(&trans, &iter, orig, k, op->new_i_size);
+ bch2_nocow_write_convert_one_unwritten(trans, &iter, orig, k, op->new_i_size);
}));
if (ret && !bch2_err_matches(ret, EROFS)) {
- struct bkey_i *k = bch2_keylist_front(&op->insert_keys);
+ struct bkey_i *insert = bch2_keylist_front(&op->insert_keys);
bch_err_inum_offset_ratelimited(c,
- k->k.p.inode, k->k.p.offset << 9,
+ insert->k.p.inode, insert->k.p.offset << 9,
"write error while doing btree update: %s",
bch2_err_str(ret));
}
}
}
- bch2_trans_exit(&trans);
+ bch2_trans_put(trans);
}
static void __bch2_nocow_write_done(struct bch_write_op *op)
static void bch2_nocow_write(struct bch_write_op *op)
{
struct bch_fs *c = op->c;
- struct btree_trans trans;
+ struct btree_trans *trans;
struct btree_iter iter;
struct bkey_s_c k;
struct bkey_ptrs_c ptrs;
if (op->flags & BCH_WRITE_MOVE)
return;
- bch2_trans_init(&trans, c, 0, 0);
+ trans = bch2_trans_get(c);
retry:
- bch2_trans_begin(&trans);
+ bch2_trans_begin(trans);
- ret = bch2_subvolume_get_snapshot(&trans, op->subvol, &snapshot);
+ ret = bch2_subvolume_get_snapshot(trans, op->subvol, &snapshot);
if (unlikely(ret))
goto err;
- bch2_trans_iter_init(&trans, &iter, BTREE_ID_extents,
+ bch2_trans_iter_init(trans, &iter, BTREE_ID_extents,
SPOS(op->pos.inode, op->pos.offset, snapshot),
BTREE_ITER_SLOTS);
while (1) {
/* Unlock before taking nocow locks, doing IO: */
bkey_reassemble(op->insert_keys.top, k);
- bch2_trans_unlock(&trans);
+ bch2_trans_unlock(trans);
bch2_cut_front(op->pos, op->insert_keys.top);
if (op->flags & BCH_WRITE_CONVERT_UNWRITTEN)
bch2_btree_iter_advance(&iter);
}
out:
- bch2_trans_iter_exit(&trans, &iter);
+ bch2_trans_iter_exit(trans, &iter);
err:
if (bch2_err_matches(ret, BCH_ERR_transaction_restart))
goto retry;
op->flags |= BCH_WRITE_DONE;
}
- bch2_trans_exit(&trans);
+ bch2_trans_put(trans);
/* fallback to cow write path? */
if (!(op->flags & BCH_WRITE_DONE)) {
* allocations for specific disks may hang arbitrarily long:
*/
ret = bch2_trans_do(c, NULL, NULL, 0,
- bch2_alloc_sectors_start_trans(&trans,
+ bch2_alloc_sectors_start_trans(trans,
op->target,
op->opts.erasure_code && !(op->flags & BCH_WRITE_CACHED),
op->write_point,
}
/**
- * bch_write - handle a write to a cache device or flash only volume
+ * bch2_write() - handle a write to a cache device or flash only volume
+ * @cl: &bch_write_op->cl
*
* This is the starting point for any data to end up in a cache device; it could
* be from a normal write, or a writeback write, or a write to a flash only
printbuf_indent_sub(out, 2);
}
-/* Cache promotion on read */
-
-struct promote_op {
- struct rcu_head rcu;
- u64 start_time;
-
- struct rhash_head hash;
- struct bpos pos;
-
- struct data_update write;
- struct bio_vec bi_inline_vecs[0]; /* must be last */
-};
-
-static const struct rhashtable_params bch_promote_params = {
- .head_offset = offsetof(struct promote_op, hash),
- .key_offset = offsetof(struct promote_op, pos),
- .key_len = sizeof(struct bpos),
-};
-
-static inline bool should_promote(struct bch_fs *c, struct bkey_s_c k,
- struct bpos pos,
- struct bch_io_opts opts,
- unsigned flags)
-{
- if (!(flags & BCH_READ_MAY_PROMOTE))
- return false;
-
- if (!opts.promote_target)
- return false;
-
- if (bch2_bkey_has_target(c, k, opts.promote_target))
- return false;
-
- if (bkey_extent_is_unwritten(k))
- return false;
-
- if (bch2_target_congested(c, opts.promote_target)) {
- /* XXX trace this */
- return false;
- }
-
- if (rhashtable_lookup_fast(&c->promote_table, &pos,
- bch_promote_params))
- return false;
-
- return true;
-}
-
-static void promote_free(struct bch_fs *c, struct promote_op *op)
-{
- int ret;
-
- bch2_data_update_exit(&op->write);
-
- ret = rhashtable_remove_fast(&c->promote_table, &op->hash,
- bch_promote_params);
- BUG_ON(ret);
- bch2_write_ref_put(c, BCH_WRITE_REF_promote);
- kfree_rcu(op, rcu);
-}
-
-static void promote_done(struct bch_write_op *wop)
-{
- struct promote_op *op =
- container_of(wop, struct promote_op, write.op);
- struct bch_fs *c = op->write.op.c;
-
- bch2_time_stats_update(&c->times[BCH_TIME_data_promote],
- op->start_time);
- promote_free(c, op);
-}
-
-static void promote_start(struct promote_op *op, struct bch_read_bio *rbio)
-{
- struct bio *bio = &op->write.op.wbio.bio;
-
- trace_and_count(op->write.op.c, read_promote, &rbio->bio);
-
- /* we now own pages: */
- BUG_ON(!rbio->bounce);
- BUG_ON(rbio->bio.bi_vcnt > bio->bi_max_vecs);
-
- memcpy(bio->bi_io_vec, rbio->bio.bi_io_vec,
- sizeof(struct bio_vec) * rbio->bio.bi_vcnt);
- swap(bio->bi_vcnt, rbio->bio.bi_vcnt);
-
- bch2_data_update_read_done(&op->write, rbio->pick.crc);
-}
-
-static struct promote_op *__promote_alloc(struct btree_trans *trans,
- enum btree_id btree_id,
- struct bkey_s_c k,
- struct bpos pos,
- struct extent_ptr_decoded *pick,
- struct bch_io_opts opts,
- unsigned sectors,
- struct bch_read_bio **rbio)
-{
- struct bch_fs *c = trans->c;
- struct promote_op *op = NULL;
- struct bio *bio;
- unsigned pages = DIV_ROUND_UP(sectors, PAGE_SECTORS);
- int ret;
-
- if (!bch2_write_ref_tryget(c, BCH_WRITE_REF_promote))
- return NULL;
-
- op = kzalloc(sizeof(*op) + sizeof(struct bio_vec) * pages, GFP_NOFS);
- if (!op)
- goto err;
-
- op->start_time = local_clock();
- op->pos = pos;
-
- /*
- * We don't use the mempool here because extents that aren't
- * checksummed or compressed can be too big for the mempool:
- */
- *rbio = kzalloc(sizeof(struct bch_read_bio) +
- sizeof(struct bio_vec) * pages,
- GFP_NOFS);
- if (!*rbio)
- goto err;
-
- rbio_init(&(*rbio)->bio, opts);
- bio_init(&(*rbio)->bio, NULL, (*rbio)->bio.bi_inline_vecs, pages, 0);
-
- if (bch2_bio_alloc_pages(&(*rbio)->bio, sectors << 9,
- GFP_NOFS))
- goto err;
-
- (*rbio)->bounce = true;
- (*rbio)->split = true;
- (*rbio)->kmalloc = true;
-
- if (rhashtable_lookup_insert_fast(&c->promote_table, &op->hash,
- bch_promote_params))
- goto err;
-
- bio = &op->write.op.wbio.bio;
- bio_init(bio, NULL, bio->bi_inline_vecs, pages, 0);
-
- ret = bch2_data_update_init(trans, NULL, &op->write,
- writepoint_hashed((unsigned long) current),
- opts,
- (struct data_update_opts) {
- .target = opts.promote_target,
- .extra_replicas = 1,
- .write_flags = BCH_WRITE_ALLOC_NOWAIT|BCH_WRITE_CACHED,
- },
- btree_id, k);
- /*
- * possible errors: -BCH_ERR_nocow_lock_blocked,
- * -BCH_ERR_ENOSPC_disk_reservation:
- */
- if (ret) {
- ret = rhashtable_remove_fast(&c->promote_table, &op->hash,
- bch_promote_params);
- BUG_ON(ret);
- goto err;
- }
-
- op->write.op.end_io = promote_done;
-
- return op;
-err:
- if (*rbio)
- bio_free_pages(&(*rbio)->bio);
- kfree(*rbio);
- *rbio = NULL;
- kfree(op);
- bch2_write_ref_put(c, BCH_WRITE_REF_promote);
- return NULL;
-}
-
-noinline
-static struct promote_op *promote_alloc(struct btree_trans *trans,
- struct bvec_iter iter,
- struct bkey_s_c k,
- struct extent_ptr_decoded *pick,
- struct bch_io_opts opts,
- unsigned flags,
- struct bch_read_bio **rbio,
- bool *bounce,
- bool *read_full)
-{
- struct bch_fs *c = trans->c;
- bool promote_full = *read_full || READ_ONCE(c->promote_whole_extents);
- /* data might have to be decompressed in the write path: */
- unsigned sectors = promote_full
- ? max(pick->crc.compressed_size, pick->crc.live_size)
- : bvec_iter_sectors(iter);
- struct bpos pos = promote_full
- ? bkey_start_pos(k.k)
- : POS(k.k->p.inode, iter.bi_sector);
- struct promote_op *promote;
-
- if (!should_promote(c, k, pos, opts, flags))
- return NULL;
-
- promote = __promote_alloc(trans,
- k.k->type == KEY_TYPE_reflink_v
- ? BTREE_ID_reflink
- : BTREE_ID_extents,
- k, pos, pick, opts, sectors, rbio);
- if (!promote)
- return NULL;
-
- *bounce = true;
- *read_full = promote_full;
- return promote;
-}
-
-/* Read */
-
-#define READ_RETRY_AVOID 1
-#define READ_RETRY 2
-#define READ_ERR 3
-
-enum rbio_context {
- RBIO_CONTEXT_NULL,
- RBIO_CONTEXT_HIGHPRI,
- RBIO_CONTEXT_UNBOUND,
-};
-
-static inline struct bch_read_bio *
-bch2_rbio_parent(struct bch_read_bio *rbio)
-{
- return rbio->split ? rbio->parent : rbio;
-}
-
-__always_inline
-static void bch2_rbio_punt(struct bch_read_bio *rbio, work_func_t fn,
- enum rbio_context context,
- struct workqueue_struct *wq)
-{
- if (context <= rbio->context) {
- fn(&rbio->work);
- } else {
- rbio->work.func = fn;
- rbio->context = context;
- queue_work(wq, &rbio->work);
- }
-}
-
-static inline struct bch_read_bio *bch2_rbio_free(struct bch_read_bio *rbio)
-{
- BUG_ON(rbio->bounce && !rbio->split);
-
- if (rbio->promote)
- promote_free(rbio->c, rbio->promote);
- rbio->promote = NULL;
-
- if (rbio->bounce)
- bch2_bio_free_pages_pool(rbio->c, &rbio->bio);
-
- if (rbio->split) {
- struct bch_read_bio *parent = rbio->parent;
-
- if (rbio->kmalloc)
- kfree(rbio);
- else
- bio_put(&rbio->bio);
-
- rbio = parent;
- }
-
- return rbio;
-}
-
-/*
- * Only called on a top level bch_read_bio to complete an entire read request,
- * not a split:
- */
-static void bch2_rbio_done(struct bch_read_bio *rbio)
-{
- if (rbio->start_time)
- bch2_time_stats_update(&rbio->c->times[BCH_TIME_data_read],
- rbio->start_time);
- bio_endio(&rbio->bio);
-}
-
-static void bch2_read_retry_nodecode(struct bch_fs *c, struct bch_read_bio *rbio,
- struct bvec_iter bvec_iter,
- struct bch_io_failures *failed,
- unsigned flags)
-{
- struct btree_trans trans;
- struct btree_iter iter;
- struct bkey_buf sk;
- struct bkey_s_c k;
- int ret;
-
- flags &= ~BCH_READ_LAST_FRAGMENT;
- flags |= BCH_READ_MUST_CLONE;
-
- bch2_bkey_buf_init(&sk);
- bch2_trans_init(&trans, c, 0, 0);
-
- bch2_trans_iter_init(&trans, &iter, rbio->data_btree,
- rbio->read_pos, BTREE_ITER_SLOTS);
-retry:
- rbio->bio.bi_status = 0;
-
- k = bch2_btree_iter_peek_slot(&iter);
- if (bkey_err(k))
- goto err;
-
- bch2_bkey_buf_reassemble(&sk, c, k);
- k = bkey_i_to_s_c(sk.k);
- bch2_trans_unlock(&trans);
-
- if (!bch2_bkey_matches_ptr(c, k,
- rbio->pick.ptr,
- rbio->data_pos.offset -
- rbio->pick.crc.offset)) {
- /* extent we wanted to read no longer exists: */
- rbio->hole = true;
- goto out;
- }
-
- ret = __bch2_read_extent(&trans, rbio, bvec_iter,
- rbio->read_pos,
- rbio->data_btree,
- k, 0, failed, flags);
- if (ret == READ_RETRY)
- goto retry;
- if (ret)
- goto err;
-out:
- bch2_rbio_done(rbio);
- bch2_trans_iter_exit(&trans, &iter);
- bch2_trans_exit(&trans);
- bch2_bkey_buf_exit(&sk, c);
- return;
-err:
- rbio->bio.bi_status = BLK_STS_IOERR;
- goto out;
-}
-
-static void bch2_rbio_retry(struct work_struct *work)
+void bch2_fs_io_write_exit(struct bch_fs *c)
{
- struct bch_read_bio *rbio =
- container_of(work, struct bch_read_bio, work);
- struct bch_fs *c = rbio->c;
- struct bvec_iter iter = rbio->bvec_iter;
- unsigned flags = rbio->flags;
- subvol_inum inum = {
- .subvol = rbio->subvol,
- .inum = rbio->read_pos.inode,
- };
- struct bch_io_failures failed = { .nr = 0 };
-
- trace_and_count(c, read_retry, &rbio->bio);
-
- if (rbio->retry == READ_RETRY_AVOID)
- bch2_mark_io_failure(&failed, &rbio->pick);
-
- rbio->bio.bi_status = 0;
-
- rbio = bch2_rbio_free(rbio);
-
- flags |= BCH_READ_IN_RETRY;
- flags &= ~BCH_READ_MAY_PROMOTE;
-
- if (flags & BCH_READ_NODECODE) {
- bch2_read_retry_nodecode(c, rbio, iter, &failed, flags);
- } else {
- flags &= ~BCH_READ_LAST_FRAGMENT;
- flags |= BCH_READ_MUST_CLONE;
-
- __bch2_read(c, rbio, iter, inum, &failed, flags);
- }
+ mempool_exit(&c->bio_bounce_pages);
+ bioset_exit(&c->bio_write);
}
-static void bch2_rbio_error(struct bch_read_bio *rbio, int retry,
- blk_status_t error)
+int bch2_fs_io_write_init(struct bch_fs *c)
{
- rbio->retry = retry;
-
- if (rbio->flags & BCH_READ_IN_RETRY)
- return;
-
- if (retry == READ_ERR) {
- rbio = bch2_rbio_free(rbio);
-
- rbio->bio.bi_status = error;
- bch2_rbio_done(rbio);
- } else {
- bch2_rbio_punt(rbio, bch2_rbio_retry,
- RBIO_CONTEXT_UNBOUND, system_unbound_wq);
- }
-}
-
-static int __bch2_rbio_narrow_crcs(struct btree_trans *trans,
- struct bch_read_bio *rbio)
-{
- struct bch_fs *c = rbio->c;
- u64 data_offset = rbio->data_pos.offset - rbio->pick.crc.offset;
- struct bch_extent_crc_unpacked new_crc;
- struct btree_iter iter;
- struct bkey_i *new;
- struct bkey_s_c k;
- int ret = 0;
-
- if (crc_is_compressed(rbio->pick.crc))
- return 0;
-
- k = bch2_bkey_get_iter(trans, &iter, rbio->data_btree, rbio->data_pos,
- BTREE_ITER_SLOTS|BTREE_ITER_INTENT);
- if ((ret = bkey_err(k)))
- goto out;
-
- if (bversion_cmp(k.k->version, rbio->version) ||
- !bch2_bkey_matches_ptr(c, k, rbio->pick.ptr, data_offset))
- goto out;
-
- /* Extent was merged? */
- if (bkey_start_offset(k.k) < data_offset ||
- k.k->p.offset > data_offset + rbio->pick.crc.uncompressed_size)
- goto out;
-
- if (bch2_rechecksum_bio(c, &rbio->bio, rbio->version,
- rbio->pick.crc, NULL, &new_crc,
- bkey_start_offset(k.k) - data_offset, k.k->size,
- rbio->pick.crc.csum_type)) {
- bch_err(c, "error verifying existing checksum while narrowing checksum (memory corruption?)");
- ret = 0;
- goto out;
- }
-
- /*
- * going to be temporarily appending another checksum entry:
- */
- new = bch2_trans_kmalloc(trans, bkey_bytes(k.k) +
- sizeof(struct bch_extent_crc128));
- if ((ret = PTR_ERR_OR_ZERO(new)))
- goto out;
-
- bkey_reassemble(new, k);
-
- if (!bch2_bkey_narrow_crcs(new, new_crc))
- goto out;
-
- ret = bch2_trans_update(trans, &iter, new,
- BTREE_UPDATE_INTERNAL_SNAPSHOT_NODE);
-out:
- bch2_trans_iter_exit(trans, &iter);
- return ret;
-}
-
-static noinline void bch2_rbio_narrow_crcs(struct bch_read_bio *rbio)
-{
- bch2_trans_do(rbio->c, NULL, NULL, BTREE_INSERT_NOFAIL,
- __bch2_rbio_narrow_crcs(&trans, rbio));
-}
-
-/* Inner part that may run in process context */
-static void __bch2_read_endio(struct work_struct *work)
-{
- struct bch_read_bio *rbio =
- container_of(work, struct bch_read_bio, work);
- struct bch_fs *c = rbio->c;
- struct bch_dev *ca = bch_dev_bkey_exists(c, rbio->pick.ptr.dev);
- struct bio *src = &rbio->bio;
- struct bio *dst = &bch2_rbio_parent(rbio)->bio;
- struct bvec_iter dst_iter = rbio->bvec_iter;
- struct bch_extent_crc_unpacked crc = rbio->pick.crc;
- struct nonce nonce = extent_nonce(rbio->version, crc);
- unsigned nofs_flags;
- struct bch_csum csum;
- int ret;
-
- nofs_flags = memalloc_nofs_save();
-
- /* Reset iterator for checksumming and copying bounced data: */
- if (rbio->bounce) {
- src->bi_iter.bi_size = crc.compressed_size << 9;
- src->bi_iter.bi_idx = 0;
- src->bi_iter.bi_bvec_done = 0;
- } else {
- src->bi_iter = rbio->bvec_iter;
- }
-
- csum = bch2_checksum_bio(c, crc.csum_type, nonce, src);
- if (bch2_crc_cmp(csum, rbio->pick.crc.csum) && !c->opts.no_data_io)
- goto csum_err;
-
- /*
- * XXX
- * We need to rework the narrow_crcs path to deliver the read completion
- * first, and then punt to a different workqueue, otherwise we're
- * holding up reads while doing btree updates which is bad for memory
- * reclaim.
- */
- if (unlikely(rbio->narrow_crcs))
- bch2_rbio_narrow_crcs(rbio);
-
- if (rbio->flags & BCH_READ_NODECODE)
- goto nodecode;
-
- /* Adjust crc to point to subset of data we want: */
- crc.offset += rbio->offset_into_extent;
- crc.live_size = bvec_iter_sectors(rbio->bvec_iter);
-
- if (crc_is_compressed(crc)) {
- ret = bch2_encrypt_bio(c, crc.csum_type, nonce, src);
- if (ret)
- goto decrypt_err;
-
- if (bch2_bio_uncompress(c, src, dst, dst_iter, crc) &&
- !c->opts.no_data_io)
- goto decompression_err;
- } else {
- /* don't need to decrypt the entire bio: */
- nonce = nonce_add(nonce, crc.offset << 9);
- bio_advance(src, crc.offset << 9);
-
- BUG_ON(src->bi_iter.bi_size < dst_iter.bi_size);
- src->bi_iter.bi_size = dst_iter.bi_size;
-
- ret = bch2_encrypt_bio(c, crc.csum_type, nonce, src);
- if (ret)
- goto decrypt_err;
-
- if (rbio->bounce) {
- struct bvec_iter src_iter = src->bi_iter;
-
- bio_copy_data_iter(dst, &dst_iter, src, &src_iter);
- }
- }
-
- if (rbio->promote) {
- /*
- * Re encrypt data we decrypted, so it's consistent with
- * rbio->crc:
- */
- ret = bch2_encrypt_bio(c, crc.csum_type, nonce, src);
- if (ret)
- goto decrypt_err;
-
- promote_start(rbio->promote, rbio);
- rbio->promote = NULL;
- }
-nodecode:
- if (likely(!(rbio->flags & BCH_READ_IN_RETRY))) {
- rbio = bch2_rbio_free(rbio);
- bch2_rbio_done(rbio);
- }
-out:
- memalloc_nofs_restore(nofs_flags);
- return;
-csum_err:
- /*
- * Checksum error: if the bio wasn't bounced, we may have been
- * reading into buffers owned by userspace (that userspace can
- * scribble over) - retry the read, bouncing it this time:
- */
- if (!rbio->bounce && (rbio->flags & BCH_READ_USER_MAPPED)) {
- rbio->flags |= BCH_READ_MUST_BOUNCE;
- bch2_rbio_error(rbio, READ_RETRY, BLK_STS_IOERR);
- goto out;
- }
-
- bch_err_inum_offset_ratelimited(ca,
- rbio->read_pos.inode,
- rbio->read_pos.offset << 9,
- "data checksum error: expected %0llx:%0llx got %0llx:%0llx (type %s)",
- rbio->pick.crc.csum.hi, rbio->pick.crc.csum.lo,
- csum.hi, csum.lo, bch2_csum_types[crc.csum_type]);
- bch2_io_error(ca);
- bch2_rbio_error(rbio, READ_RETRY_AVOID, BLK_STS_IOERR);
- goto out;
-decompression_err:
- bch_err_inum_offset_ratelimited(c, rbio->read_pos.inode,
- rbio->read_pos.offset << 9,
- "decompression error");
- bch2_rbio_error(rbio, READ_ERR, BLK_STS_IOERR);
- goto out;
-decrypt_err:
- bch_err_inum_offset_ratelimited(c, rbio->read_pos.inode,
- rbio->read_pos.offset << 9,
- "decrypt error");
- bch2_rbio_error(rbio, READ_ERR, BLK_STS_IOERR);
- goto out;
-}
-
-static void bch2_read_endio(struct bio *bio)
-{
- struct bch_read_bio *rbio =
- container_of(bio, struct bch_read_bio, bio);
- struct bch_fs *c = rbio->c;
- struct bch_dev *ca = bch_dev_bkey_exists(c, rbio->pick.ptr.dev);
- struct workqueue_struct *wq = NULL;
- enum rbio_context context = RBIO_CONTEXT_NULL;
-
- if (rbio->have_ioref) {
- bch2_latency_acct(ca, rbio->submit_time, READ);
- percpu_ref_put(&ca->io_ref);
- }
-
- if (!rbio->split)
- rbio->bio.bi_end_io = rbio->end_io;
-
- if (bch2_dev_inum_io_err_on(bio->bi_status, ca,
- rbio->read_pos.inode,
- rbio->read_pos.offset,
- "data read error: %s",
- bch2_blk_status_to_str(bio->bi_status))) {
- bch2_rbio_error(rbio, READ_RETRY_AVOID, bio->bi_status);
- return;
- }
-
- if (((rbio->flags & BCH_READ_RETRY_IF_STALE) && race_fault()) ||
- ptr_stale(ca, &rbio->pick.ptr)) {
- trace_and_count(c, read_reuse_race, &rbio->bio);
-
- if (rbio->flags & BCH_READ_RETRY_IF_STALE)
- bch2_rbio_error(rbio, READ_RETRY, BLK_STS_AGAIN);
- else
- bch2_rbio_error(rbio, READ_ERR, BLK_STS_AGAIN);
- return;
- }
-
- if (rbio->narrow_crcs ||
- rbio->promote ||
- crc_is_compressed(rbio->pick.crc) ||
- bch2_csum_type_is_encryption(rbio->pick.crc.csum_type))
- context = RBIO_CONTEXT_UNBOUND, wq = system_unbound_wq;
- else if (rbio->pick.crc.csum_type)
- context = RBIO_CONTEXT_HIGHPRI, wq = system_highpri_wq;
-
- bch2_rbio_punt(rbio, __bch2_read_endio, context, wq);
-}
-
-int __bch2_read_indirect_extent(struct btree_trans *trans,
- unsigned *offset_into_extent,
- struct bkey_buf *orig_k)
-{
- struct btree_iter iter;
- struct bkey_s_c k;
- u64 reflink_offset;
- int ret;
-
- reflink_offset = le64_to_cpu(bkey_i_to_reflink_p(orig_k->k)->v.idx) +
- *offset_into_extent;
-
- k = bch2_bkey_get_iter(trans, &iter, BTREE_ID_reflink,
- POS(0, reflink_offset), 0);
- ret = bkey_err(k);
- if (ret)
- goto err;
-
- if (k.k->type != KEY_TYPE_reflink_v &&
- k.k->type != KEY_TYPE_indirect_inline_data) {
- bch_err_inum_offset_ratelimited(trans->c,
- orig_k->k->k.p.inode,
- orig_k->k->k.p.offset << 9,
- "%llu len %u points to nonexistent indirect extent %llu",
- orig_k->k->k.p.offset,
- orig_k->k->k.size,
- reflink_offset);
- bch2_inconsistent_error(trans->c);
- ret = -EIO;
- goto err;
- }
-
- *offset_into_extent = iter.pos.offset - bkey_start_offset(k.k);
- bch2_bkey_buf_reassemble(orig_k, trans->c, k);
-err:
- bch2_trans_iter_exit(trans, &iter);
- return ret;
-}
-
-static noinline void read_from_stale_dirty_pointer(struct btree_trans *trans,
- struct bkey_s_c k,
- struct bch_extent_ptr ptr)
-{
- struct bch_fs *c = trans->c;
- struct bch_dev *ca = bch_dev_bkey_exists(c, ptr.dev);
- struct btree_iter iter;
- struct printbuf buf = PRINTBUF;
- int ret;
-
- bch2_trans_iter_init(trans, &iter, BTREE_ID_alloc,
- PTR_BUCKET_POS(c, &ptr),
- BTREE_ITER_CACHED);
-
- prt_printf(&buf, "Attempting to read from stale dirty pointer:");
- printbuf_indent_add(&buf, 2);
- prt_newline(&buf);
-
- bch2_bkey_val_to_text(&buf, c, k);
- prt_newline(&buf);
-
- prt_printf(&buf, "memory gen: %u", *bucket_gen(ca, iter.pos.offset));
-
- ret = lockrestart_do(trans, bkey_err(k = bch2_btree_iter_peek_slot(&iter)));
- if (!ret) {
- prt_newline(&buf);
- bch2_bkey_val_to_text(&buf, c, k);
- }
-
- bch2_fs_inconsistent(c, "%s", buf.buf);
-
- bch2_trans_iter_exit(trans, &iter);
- printbuf_exit(&buf);
-}
-
-int __bch2_read_extent(struct btree_trans *trans, struct bch_read_bio *orig,
- struct bvec_iter iter, struct bpos read_pos,
- enum btree_id data_btree, struct bkey_s_c k,
- unsigned offset_into_extent,
- struct bch_io_failures *failed, unsigned flags)
-{
- struct bch_fs *c = trans->c;
- struct extent_ptr_decoded pick;
- struct bch_read_bio *rbio = NULL;
- struct bch_dev *ca = NULL;
- struct promote_op *promote = NULL;
- bool bounce = false, read_full = false, narrow_crcs = false;
- struct bpos data_pos = bkey_start_pos(k.k);
- int pick_ret;
-
- if (bkey_extent_is_inline_data(k.k)) {
- unsigned bytes = min_t(unsigned, iter.bi_size,
- bkey_inline_data_bytes(k.k));
-
- swap(iter.bi_size, bytes);
- memcpy_to_bio(&orig->bio, iter, bkey_inline_data_p(k));
- swap(iter.bi_size, bytes);
- bio_advance_iter(&orig->bio, &iter, bytes);
- zero_fill_bio_iter(&orig->bio, iter);
- goto out_read_done;
- }
-retry_pick:
- pick_ret = bch2_bkey_pick_read_device(c, k, failed, &pick);
-
- /* hole or reservation - just zero fill: */
- if (!pick_ret)
- goto hole;
-
- if (pick_ret < 0) {
- bch_err_inum_offset_ratelimited(c,
- read_pos.inode, read_pos.offset << 9,
- "no device to read from");
- goto err;
- }
-
- ca = bch_dev_bkey_exists(c, pick.ptr.dev);
-
- /*
- * Stale dirty pointers are treated as IO errors, but @failed isn't
- * allocated unless we're in the retry path - so if we're not in the
- * retry path, don't check here, it'll be caught in bch2_read_endio()
- * and we'll end up in the retry path:
- */
- if ((flags & BCH_READ_IN_RETRY) &&
- !pick.ptr.cached &&
- unlikely(ptr_stale(ca, &pick.ptr))) {
- read_from_stale_dirty_pointer(trans, k, pick.ptr);
- bch2_mark_io_failure(failed, &pick);
- goto retry_pick;
- }
-
- /*
- * Unlock the iterator while the btree node's lock is still in
- * cache, before doing the IO:
- */
- bch2_trans_unlock(trans);
-
- if (flags & BCH_READ_NODECODE) {
- /*
- * can happen if we retry, and the extent we were going to read
- * has been merged in the meantime:
- */
- if (pick.crc.compressed_size > orig->bio.bi_vcnt * PAGE_SECTORS)
- goto hole;
-
- iter.bi_size = pick.crc.compressed_size << 9;
- goto get_bio;
- }
-
- if (!(flags & BCH_READ_LAST_FRAGMENT) ||
- bio_flagged(&orig->bio, BIO_CHAIN))
- flags |= BCH_READ_MUST_CLONE;
-
- narrow_crcs = !(flags & BCH_READ_IN_RETRY) &&
- bch2_can_narrow_extent_crcs(k, pick.crc);
-
- if (narrow_crcs && (flags & BCH_READ_USER_MAPPED))
- flags |= BCH_READ_MUST_BOUNCE;
-
- EBUG_ON(offset_into_extent + bvec_iter_sectors(iter) > k.k->size);
-
- if (crc_is_compressed(pick.crc) ||
- (pick.crc.csum_type != BCH_CSUM_none &&
- (bvec_iter_sectors(iter) != pick.crc.uncompressed_size ||
- (bch2_csum_type_is_encryption(pick.crc.csum_type) &&
- (flags & BCH_READ_USER_MAPPED)) ||
- (flags & BCH_READ_MUST_BOUNCE)))) {
- read_full = true;
- bounce = true;
- }
-
- if (orig->opts.promote_target)
- promote = promote_alloc(trans, iter, k, &pick, orig->opts, flags,
- &rbio, &bounce, &read_full);
-
- if (!read_full) {
- EBUG_ON(crc_is_compressed(pick.crc));
- EBUG_ON(pick.crc.csum_type &&
- (bvec_iter_sectors(iter) != pick.crc.uncompressed_size ||
- bvec_iter_sectors(iter) != pick.crc.live_size ||
- pick.crc.offset ||
- offset_into_extent));
-
- data_pos.offset += offset_into_extent;
- pick.ptr.offset += pick.crc.offset +
- offset_into_extent;
- offset_into_extent = 0;
- pick.crc.compressed_size = bvec_iter_sectors(iter);
- pick.crc.uncompressed_size = bvec_iter_sectors(iter);
- pick.crc.offset = 0;
- pick.crc.live_size = bvec_iter_sectors(iter);
- offset_into_extent = 0;
- }
-get_bio:
- if (rbio) {
- /*
- * promote already allocated bounce rbio:
- * promote needs to allocate a bio big enough for uncompressing
- * data in the write path, but we're not going to use it all
- * here:
- */
- EBUG_ON(rbio->bio.bi_iter.bi_size <
- pick.crc.compressed_size << 9);
- rbio->bio.bi_iter.bi_size =
- pick.crc.compressed_size << 9;
- } else if (bounce) {
- unsigned sectors = pick.crc.compressed_size;
-
- rbio = rbio_init(bio_alloc_bioset(NULL,
- DIV_ROUND_UP(sectors, PAGE_SECTORS),
- 0,
- GFP_NOFS,
- &c->bio_read_split),
- orig->opts);
-
- bch2_bio_alloc_pages_pool(c, &rbio->bio, sectors << 9);
- rbio->bounce = true;
- rbio->split = true;
- } else if (flags & BCH_READ_MUST_CLONE) {
- /*
- * Have to clone if there were any splits, due to error
- * reporting issues (if a split errored, and retrying didn't
- * work, when it reports the error to its parent (us) we don't
- * know if the error was from our bio, and we should retry, or
- * from the whole bio, in which case we don't want to retry and
- * lose the error)
- */
- rbio = rbio_init(bio_alloc_clone(NULL, &orig->bio, GFP_NOFS,
- &c->bio_read_split),
- orig->opts);
- rbio->bio.bi_iter = iter;
- rbio->split = true;
- } else {
- rbio = orig;
- rbio->bio.bi_iter = iter;
- EBUG_ON(bio_flagged(&rbio->bio, BIO_CHAIN));
- }
-
- EBUG_ON(bio_sectors(&rbio->bio) != pick.crc.compressed_size);
-
- rbio->c = c;
- rbio->submit_time = local_clock();
- if (rbio->split)
- rbio->parent = orig;
- else
- rbio->end_io = orig->bio.bi_end_io;
- rbio->bvec_iter = iter;
- rbio->offset_into_extent= offset_into_extent;
- rbio->flags = flags;
- rbio->have_ioref = pick_ret > 0 && bch2_dev_get_ioref(ca, READ);
- rbio->narrow_crcs = narrow_crcs;
- rbio->hole = 0;
- rbio->retry = 0;
- rbio->context = 0;
- /* XXX: only initialize this if needed */
- rbio->devs_have = bch2_bkey_devs(k);
- rbio->pick = pick;
- rbio->subvol = orig->subvol;
- rbio->read_pos = read_pos;
- rbio->data_btree = data_btree;
- rbio->data_pos = data_pos;
- rbio->version = k.k->version;
- rbio->promote = promote;
- INIT_WORK(&rbio->work, NULL);
-
- rbio->bio.bi_opf = orig->bio.bi_opf;
- rbio->bio.bi_iter.bi_sector = pick.ptr.offset;
- rbio->bio.bi_end_io = bch2_read_endio;
-
- if (rbio->bounce)
- trace_and_count(c, read_bounce, &rbio->bio);
-
- this_cpu_add(c->counters[BCH_COUNTER_io_read], bio_sectors(&rbio->bio));
- bch2_increment_clock(c, bio_sectors(&rbio->bio), READ);
-
- /*
- * If it's being moved internally, we don't want to flag it as a cache
- * hit:
- */
- if (pick.ptr.cached && !(flags & BCH_READ_NODECODE))
- bch2_bucket_io_time_reset(trans, pick.ptr.dev,
- PTR_BUCKET_NR(ca, &pick.ptr), READ);
-
- if (!(flags & (BCH_READ_IN_RETRY|BCH_READ_LAST_FRAGMENT))) {
- bio_inc_remaining(&orig->bio);
- trace_and_count(c, read_split, &orig->bio);
- }
-
- if (!rbio->pick.idx) {
- if (!rbio->have_ioref) {
- bch_err_inum_offset_ratelimited(c,
- read_pos.inode,
- read_pos.offset << 9,
- "no device to read from");
- bch2_rbio_error(rbio, READ_RETRY_AVOID, BLK_STS_IOERR);
- goto out;
- }
-
- this_cpu_add(ca->io_done->sectors[READ][BCH_DATA_user],
- bio_sectors(&rbio->bio));
- bio_set_dev(&rbio->bio, ca->disk_sb.bdev);
-
- if (unlikely(c->opts.no_data_io)) {
- if (likely(!(flags & BCH_READ_IN_RETRY)))
- bio_endio(&rbio->bio);
- } else {
- if (likely(!(flags & BCH_READ_IN_RETRY)))
- submit_bio(&rbio->bio);
- else
- submit_bio_wait(&rbio->bio);
- }
-
- /*
- * We just submitted IO which may block, we expect relock fail
- * events and shouldn't count them:
- */
- trans->notrace_relock_fail = true;
- } else {
- /* Attempting reconstruct read: */
- if (bch2_ec_read_extent(c, rbio)) {
- bch2_rbio_error(rbio, READ_RETRY_AVOID, BLK_STS_IOERR);
- goto out;
- }
-
- if (likely(!(flags & BCH_READ_IN_RETRY)))
- bio_endio(&rbio->bio);
- }
-out:
- if (likely(!(flags & BCH_READ_IN_RETRY))) {
- return 0;
- } else {
- int ret;
-
- rbio->context = RBIO_CONTEXT_UNBOUND;
- bch2_read_endio(&rbio->bio);
-
- ret = rbio->retry;
- rbio = bch2_rbio_free(rbio);
-
- if (ret == READ_RETRY_AVOID) {
- bch2_mark_io_failure(failed, &pick);
- ret = READ_RETRY;
- }
-
- if (!ret)
- goto out_read_done;
-
- return ret;
- }
-
-err:
- if (flags & BCH_READ_IN_RETRY)
- return READ_ERR;
-
- orig->bio.bi_status = BLK_STS_IOERR;
- goto out_read_done;
-
-hole:
- /*
- * won't normally happen in the BCH_READ_NODECODE
- * (bch2_move_extent()) path, but if we retry and the extent we wanted
- * to read no longer exists we have to signal that:
- */
- if (flags & BCH_READ_NODECODE)
- orig->hole = true;
-
- zero_fill_bio_iter(&orig->bio, iter);
-out_read_done:
- if (flags & BCH_READ_LAST_FRAGMENT)
- bch2_rbio_done(orig);
- return 0;
-}
-
-void __bch2_read(struct bch_fs *c, struct bch_read_bio *rbio,
- struct bvec_iter bvec_iter, subvol_inum inum,
- struct bch_io_failures *failed, unsigned flags)
-{
- struct btree_trans trans;
- struct btree_iter iter;
- struct bkey_buf sk;
- struct bkey_s_c k;
- u32 snapshot;
- int ret;
-
- BUG_ON(flags & BCH_READ_NODECODE);
-
- bch2_bkey_buf_init(&sk);
- bch2_trans_init(&trans, c, 0, 0);
-retry:
- bch2_trans_begin(&trans);
- iter = (struct btree_iter) { NULL };
-
- ret = bch2_subvolume_get_snapshot(&trans, inum.subvol, &snapshot);
- if (ret)
- goto err;
-
- bch2_trans_iter_init(&trans, &iter, BTREE_ID_extents,
- SPOS(inum.inum, bvec_iter.bi_sector, snapshot),
- BTREE_ITER_SLOTS);
- while (1) {
- unsigned bytes, sectors, offset_into_extent;
- enum btree_id data_btree = BTREE_ID_extents;
-
- /*
- * read_extent -> io_time_reset may cause a transaction restart
- * without returning an error, we need to check for that here:
- */
- ret = bch2_trans_relock(&trans);
- if (ret)
- break;
-
- bch2_btree_iter_set_pos(&iter,
- POS(inum.inum, bvec_iter.bi_sector));
-
- k = bch2_btree_iter_peek_slot(&iter);
- ret = bkey_err(k);
- if (ret)
- break;
-
- offset_into_extent = iter.pos.offset -
- bkey_start_offset(k.k);
- sectors = k.k->size - offset_into_extent;
-
- bch2_bkey_buf_reassemble(&sk, c, k);
-
- ret = bch2_read_indirect_extent(&trans, &data_btree,
- &offset_into_extent, &sk);
- if (ret)
- break;
-
- k = bkey_i_to_s_c(sk.k);
-
- /*
- * With indirect extents, the amount of data to read is the min
- * of the original extent and the indirect extent:
- */
- sectors = min(sectors, k.k->size - offset_into_extent);
-
- bytes = min(sectors, bvec_iter_sectors(bvec_iter)) << 9;
- swap(bvec_iter.bi_size, bytes);
-
- if (bvec_iter.bi_size == bytes)
- flags |= BCH_READ_LAST_FRAGMENT;
-
- ret = __bch2_read_extent(&trans, rbio, bvec_iter, iter.pos,
- data_btree, k,
- offset_into_extent, failed, flags);
- if (ret)
- break;
-
- if (flags & BCH_READ_LAST_FRAGMENT)
- break;
-
- swap(bvec_iter.bi_size, bytes);
- bio_advance_iter(&rbio->bio, &bvec_iter, bytes);
-
- ret = btree_trans_too_many_iters(&trans);
- if (ret)
- break;
- }
-err:
- bch2_trans_iter_exit(&trans, &iter);
-
- if (bch2_err_matches(ret, BCH_ERR_transaction_restart) ||
- ret == READ_RETRY ||
- ret == READ_RETRY_AVOID)
- goto retry;
-
- bch2_trans_exit(&trans);
- bch2_bkey_buf_exit(&sk, c);
-
- if (ret) {
- bch_err_inum_offset_ratelimited(c, inum.inum,
- bvec_iter.bi_sector << 9,
- "read error %i from btree lookup", ret);
- rbio->bio.bi_status = BLK_STS_IOERR;
- bch2_rbio_done(rbio);
- }
-}
-
-void bch2_fs_io_exit(struct bch_fs *c)
-{
- if (c->promote_table.tbl)
- rhashtable_destroy(&c->promote_table);
- mempool_exit(&c->bio_bounce_pages);
- bioset_exit(&c->bio_write);
- bioset_exit(&c->bio_read_split);
- bioset_exit(&c->bio_read);
-}
-
-int bch2_fs_io_init(struct bch_fs *c)
-{
- if (bioset_init(&c->bio_read, 1, offsetof(struct bch_read_bio, bio),
- BIOSET_NEED_BVECS))
- return -BCH_ERR_ENOMEM_bio_read_init;
-
- if (bioset_init(&c->bio_read_split, 1, offsetof(struct bch_read_bio, bio),
- BIOSET_NEED_BVECS))
- return -BCH_ERR_ENOMEM_bio_read_split_init;
-
- if (bioset_init(&c->bio_write, 1, offsetof(struct bch_write_bio, bio),
- BIOSET_NEED_BVECS))
- return -BCH_ERR_ENOMEM_bio_write_init;
+ if (bioset_init(&c->bio_write, 1, offsetof(struct bch_write_bio, bio),
+ BIOSET_NEED_BVECS))
+ return -BCH_ERR_ENOMEM_bio_write_init;
if (mempool_init_page_pool(&c->bio_bounce_pages,
max_t(unsigned,
PAGE_SIZE, 0))
return -BCH_ERR_ENOMEM_bio_bounce_pages_init;
- if (rhashtable_init(&c->promote_table, &bch_promote_params))
- return -BCH_ERR_ENOMEM_promote_table_init;
-
return 0;
}
projects / bcachefs-tools-debian / blobdiff