a0d11feefb
Using commit_do() to call alloc_sectors_start_trans() breaks when we're randomly injecting transaction restarts - the restart in the commit causes us to leak the lock that alloc_sectorS_start_trans() takes. Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>
1267 lines
32 KiB
C
1267 lines
32 KiB
C
// 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 "btree_update.h"
|
|
#include "buckets.h"
|
|
#include "checksum.h"
|
|
#include "clock.h"
|
|
#include "compress.h"
|
|
#include "data_update.h"
|
|
#include "disk_groups.h"
|
|
#include "ec.h"
|
|
#include "error.h"
|
|
#include "io_read.h"
|
|
#include "io_misc.h"
|
|
#include "io_write.h"
|
|
#include "subvolume.h"
|
|
#include "trace.h"
|
|
|
|
#include <linux/sched/mm.h>
|
|
|
|
#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;
|
|
}
|
|
|
|
#else
|
|
|
|
static bool bch2_target_congested(struct bch_fs *c, u16 target)
|
|
{
|
|
return false;
|
|
}
|
|
|
|
#endif
|
|
|
|
/* 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[]; /* 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),
|
|
.automatic_shrinking = true,
|
|
};
|
|
|
|
static inline int should_promote(struct bch_fs *c, struct bkey_s_c k,
|
|
struct bpos pos,
|
|
struct bch_io_opts opts,
|
|
unsigned flags,
|
|
struct bch_io_failures *failed)
|
|
{
|
|
if (!failed) {
|
|
BUG_ON(!opts.promote_target);
|
|
|
|
if (!(flags & BCH_READ_MAY_PROMOTE))
|
|
return -BCH_ERR_nopromote_may_not;
|
|
|
|
if (bch2_bkey_has_target(c, k, opts.promote_target))
|
|
return -BCH_ERR_nopromote_already_promoted;
|
|
|
|
if (bkey_extent_is_unwritten(k))
|
|
return -BCH_ERR_nopromote_unwritten;
|
|
|
|
if (bch2_target_congested(c, opts.promote_target))
|
|
return -BCH_ERR_nopromote_congested;
|
|
}
|
|
|
|
if (rhashtable_lookup_fast(&c->promote_table, &pos,
|
|
bch_promote_params))
|
|
return -BCH_ERR_nopromote_in_flight;
|
|
|
|
return 0;
|
|
}
|
|
|
|
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_io_failures *failed)
|
|
{
|
|
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 ERR_PTR(-BCH_ERR_nopromote_no_writes);
|
|
|
|
op = kzalloc(struct_size(op, bi_inline_vecs, pages), GFP_KERNEL);
|
|
if (!op) {
|
|
ret = -BCH_ERR_nopromote_enomem;
|
|
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_KERNEL);
|
|
if (!*rbio) {
|
|
ret = -BCH_ERR_nopromote_enomem;
|
|
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_KERNEL)) {
|
|
ret = -BCH_ERR_nopromote_enomem;
|
|
goto err;
|
|
}
|
|
|
|
(*rbio)->bounce = true;
|
|
(*rbio)->split = true;
|
|
(*rbio)->kmalloc = true;
|
|
|
|
if (rhashtable_lookup_insert_fast(&c->promote_table, &op->hash,
|
|
bch_promote_params)) {
|
|
ret = -BCH_ERR_nopromote_in_flight;
|
|
goto err;
|
|
}
|
|
|
|
bio = &op->write.op.wbio.bio;
|
|
bio_init(bio, NULL, bio->bi_inline_vecs, pages, 0);
|
|
|
|
struct data_update_opts update_opts = {};
|
|
|
|
if (!failed) {
|
|
update_opts.target = opts.promote_target;
|
|
update_opts.extra_replicas = 1;
|
|
update_opts.write_flags = BCH_WRITE_ALLOC_NOWAIT|BCH_WRITE_CACHED;
|
|
} else {
|
|
update_opts.target = opts.foreground_target;
|
|
|
|
struct bkey_ptrs_c ptrs = bch2_bkey_ptrs_c(k);
|
|
unsigned i = 0;
|
|
bkey_for_each_ptr(ptrs, ptr) {
|
|
if (bch2_dev_io_failures(failed, ptr->dev))
|
|
update_opts.rewrite_ptrs |= BIT(i);
|
|
i++;
|
|
}
|
|
}
|
|
|
|
ret = bch2_data_update_init(trans, NULL, NULL, &op->write,
|
|
writepoint_hashed((unsigned long) current),
|
|
opts,
|
|
update_opts,
|
|
btree_id, k);
|
|
/*
|
|
* possible errors: -BCH_ERR_nocow_lock_blocked,
|
|
* -BCH_ERR_ENOSPC_disk_reservation:
|
|
*/
|
|
if (ret) {
|
|
BUG_ON(rhashtable_remove_fast(&c->promote_table, &op->hash,
|
|
bch_promote_params));
|
|
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 ERR_PTR(ret);
|
|
}
|
|
|
|
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_io_failures *failed)
|
|
{
|
|
struct bch_fs *c = trans->c;
|
|
/*
|
|
* if failed != NULL we're not actually doing a promote, we're
|
|
* recovering from an io/checksum error
|
|
*/
|
|
bool promote_full = (failed ||
|
|
*read_full ||
|
|
READ_ONCE(c->opts.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;
|
|
int ret;
|
|
|
|
ret = should_promote(c, k, pos, opts, flags, failed);
|
|
if (ret)
|
|
goto nopromote;
|
|
|
|
promote = __promote_alloc(trans,
|
|
k.k->type == KEY_TYPE_reflink_v
|
|
? BTREE_ID_reflink
|
|
: BTREE_ID_extents,
|
|
k, pos, pick, opts, sectors, rbio, failed);
|
|
ret = PTR_ERR_OR_ZERO(promote);
|
|
if (ret)
|
|
goto nopromote;
|
|
|
|
*bounce = true;
|
|
*read_full = promote_full;
|
|
return promote;
|
|
nopromote:
|
|
trace_read_nopromote(c, ret);
|
|
return NULL;
|
|
}
|
|
|
|
/* 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 = bch2_trans_get(c);
|
|
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_iter_init(trans, &iter, rbio->data_btree,
|
|
rbio->read_pos, BTREE_ITER_slots);
|
|
retry:
|
|
bch2_trans_begin(trans);
|
|
rbio->bio.bi_status = 0;
|
|
|
|
ret = lockrestart_do(trans, bkey_err(k = bch2_btree_iter_peek_slot(&iter)));
|
|
if (ret)
|
|
goto err;
|
|
|
|
bch2_bkey_buf_reassemble(&sk, c, k);
|
|
k = bkey_i_to_s_c(sk.k);
|
|
|
|
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_put(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)
|
|
{
|
|
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);
|
|
}
|
|
}
|
|
|
|
static void bch2_rbio_error(struct bch_read_bio *rbio, int retry,
|
|
blk_status_t error)
|
|
{
|
|
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->bversion, 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_commit_do(rbio->c, NULL, NULL, BCH_TRANS_COMMIT_no_enospc,
|
|
__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 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;
|
|
}
|
|
|
|
struct printbuf buf = PRINTBUF;
|
|
buf.atomic++;
|
|
prt_str(&buf, "data ");
|
|
bch2_csum_err_msg(&buf, crc.csum_type, rbio->pick.crc.csum, csum);
|
|
|
|
struct bch_dev *ca = rbio->have_ioref ? bch2_dev_have_ref(c, rbio->pick.ptr.dev) : NULL;
|
|
if (ca) {
|
|
bch_err_inum_offset_ratelimited(ca,
|
|
rbio->read_pos.inode,
|
|
rbio->read_pos.offset << 9,
|
|
"data %s", buf.buf);
|
|
bch2_io_error(ca, BCH_MEMBER_ERROR_checksum);
|
|
}
|
|
printbuf_exit(&buf);
|
|
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 = rbio->have_ioref ? bch2_dev_have_ref(c, rbio->pick.ptr.dev) : NULL;
|
|
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 (bio->bi_status) {
|
|
if (ca) {
|
|
bch_err_inum_offset_ratelimited(ca,
|
|
rbio->read_pos.inode,
|
|
rbio->read_pos.offset,
|
|
"data read error: %s",
|
|
bch2_blk_status_to_str(bio->bi_status));
|
|
bch2_io_error(ca, BCH_MEMBER_ERROR_read);
|
|
}
|
|
bch2_rbio_error(rbio, READ_RETRY_AVOID, bio->bi_status);
|
|
return;
|
|
}
|
|
|
|
if (((rbio->flags & BCH_READ_RETRY_IF_STALE) && race_fault()) ||
|
|
(ca && dev_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 = -BCH_ERR_missing_indirect_extent;
|
|
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 bch_dev *ca,
|
|
struct bkey_s_c k,
|
|
struct bch_extent_ptr ptr)
|
|
{
|
|
struct bch_fs *c = trans->c;
|
|
struct btree_iter iter;
|
|
struct printbuf buf = PRINTBUF;
|
|
int ret;
|
|
|
|
bch2_trans_iter_init(trans, &iter, BTREE_ID_alloc,
|
|
PTR_BUCKET_POS(ca, &ptr),
|
|
BTREE_ITER_cached);
|
|
|
|
u8 *gen = bucket_gen(ca, iter.pos.offset);
|
|
if (gen) {
|
|
|
|
prt_printf(&buf, "Attempting to read from stale dirty pointer:\n");
|
|
printbuf_indent_add(&buf, 2);
|
|
|
|
bch2_bkey_val_to_text(&buf, c, k);
|
|
prt_newline(&buf);
|
|
|
|
prt_printf(&buf, "memory gen: %u", *gen);
|
|
|
|
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);
|
|
}
|
|
} else {
|
|
prt_printf(&buf, "Attempting to read from invalid bucket %llu:%llu:\n",
|
|
iter.pos.inode, iter.pos.offset);
|
|
printbuf_indent_add(&buf, 2);
|
|
|
|
prt_printf(&buf, "first bucket %u nbuckets %llu\n",
|
|
ca->mi.first_bucket, ca->mi.nbuckets);
|
|
|
|
bch2_bkey_val_to_text(&buf, c, k);
|
|
prt_newline(&buf);
|
|
}
|
|
|
|
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 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) {
|
|
struct printbuf buf = PRINTBUF;
|
|
bch2_bkey_val_to_text(&buf, c, k);
|
|
|
|
bch_err_inum_offset_ratelimited(c,
|
|
read_pos.inode, read_pos.offset << 9,
|
|
"no device to read from: %s\n %s",
|
|
bch2_err_str(pick_ret),
|
|
buf.buf);
|
|
printbuf_exit(&buf);
|
|
goto err;
|
|
}
|
|
|
|
struct bch_dev *ca = bch2_dev_get_ioref(c, pick.ptr.dev, READ);
|
|
|
|
/*
|
|
* 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 &&
|
|
ca &&
|
|
unlikely(dev_ptr_stale(ca, &pick.ptr))) {
|
|
read_from_stale_dirty_pointer(trans, ca, k, pick.ptr);
|
|
bch2_mark_io_failure(failed, &pick);
|
|
percpu_ref_put(&ca->io_ref);
|
|
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) {
|
|
if (ca)
|
|
percpu_ref_put(&ca->io_ref);
|
|
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)// || failed)
|
|
promote = promote_alloc(trans, iter, k, &pick, orig->opts, flags,
|
|
&rbio, &bounce, &read_full, failed);
|
|
|
|
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);
|
|
}
|
|
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 = ca != NULL;
|
|
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->bversion;
|
|
rbio->promote = promote;
|
|
INIT_WORK(&rbio->work, NULL);
|
|
|
|
if (flags & BCH_READ_NODECODE)
|
|
orig->pick = pick;
|
|
|
|
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 (ca && 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(trans, rbio, k)) {
|
|
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 = bch2_trans_get(c);
|
|
struct btree_iter iter;
|
|
struct bkey_buf sk;
|
|
struct bkey_s_c k;
|
|
int ret;
|
|
|
|
BUG_ON(flags & BCH_READ_NODECODE);
|
|
|
|
bch2_bkey_buf_init(&sk);
|
|
bch2_trans_iter_init(trans, &iter, BTREE_ID_extents,
|
|
POS(inum.inum, bvec_iter.bi_sector),
|
|
BTREE_ITER_slots);
|
|
|
|
while (1) {
|
|
unsigned bytes, sectors, offset_into_extent;
|
|
enum btree_id data_btree = BTREE_ID_extents;
|
|
|
|
bch2_trans_begin(trans);
|
|
|
|
u32 snapshot;
|
|
ret = bch2_subvolume_get_snapshot(trans, inum.subvol, &snapshot);
|
|
if (ret)
|
|
goto err;
|
|
|
|
bch2_btree_iter_set_snapshot(&iter, snapshot);
|
|
|
|
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)
|
|
goto err;
|
|
|
|
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)
|
|
goto err;
|
|
|
|
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)
|
|
goto err;
|
|
|
|
if (flags & BCH_READ_LAST_FRAGMENT)
|
|
break;
|
|
|
|
swap(bvec_iter.bi_size, bytes);
|
|
bio_advance_iter(&rbio->bio, &bvec_iter, bytes);
|
|
err:
|
|
if (ret &&
|
|
!bch2_err_matches(ret, BCH_ERR_transaction_restart) &&
|
|
ret != READ_RETRY &&
|
|
ret != READ_RETRY_AVOID)
|
|
break;
|
|
}
|
|
|
|
bch2_trans_iter_exit(trans, &iter);
|
|
bch2_trans_put(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_read_exit(struct bch_fs *c)
|
|
{
|
|
if (c->promote_table.tbl)
|
|
rhashtable_destroy(&c->promote_table);
|
|
bioset_exit(&c->bio_read_split);
|
|
bioset_exit(&c->bio_read);
|
|
}
|
|
|
|
int bch2_fs_io_read_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 (rhashtable_init(&c->promote_table, &bch_promote_params))
|
|
return -BCH_ERR_ENOMEM_promote_table_init;
|
|
|
|
return 0;
|
|
}
|