linux/fs/btrfs/bio.c
Christoph Hellwig bacf60e515 btrfs: move repair_io_failure to bio.c
repair_io_failure ties directly into all the glory low-level details of
mapping a bio with a logic address to the actual physical location.
Move it right below btrfs_submit_bio to keep all the related logic
together.

Also move btrfs_repair_eb_io_failure to its caller in disk-io.c now that
repair_io_failure is available in a header.

Reviewed-by: Josef Bacik <josef@toxicpanda.com>
Reviewed-by: Johannes Thumshirn <johannes.thumshirn@wdc.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
2022-12-05 18:00:57 +01:00

382 lines
10 KiB
C

// SPDX-License-Identifier: GPL-2.0
/*
* Copyright (C) 2007 Oracle. All rights reserved.
* Copyright (C) 2022 Christoph Hellwig.
*/
#include <linux/bio.h>
#include "bio.h"
#include "ctree.h"
#include "volumes.h"
#include "raid56.h"
#include "async-thread.h"
#include "check-integrity.h"
#include "dev-replace.h"
#include "rcu-string.h"
#include "zoned.h"
static struct bio_set btrfs_bioset;
/*
* Initialize a btrfs_bio structure. This skips the embedded bio itself as it
* is already initialized by the block layer.
*/
static inline void btrfs_bio_init(struct btrfs_bio *bbio,
btrfs_bio_end_io_t end_io, void *private)
{
memset(bbio, 0, offsetof(struct btrfs_bio, bio));
bbio->end_io = end_io;
bbio->private = private;
}
/*
* Allocate a btrfs_bio structure. The btrfs_bio is the main I/O container for
* btrfs, and is used for all I/O submitted through btrfs_submit_bio.
*
* Just like the underlying bio_alloc_bioset it will not fail as it is backed by
* a mempool.
*/
struct bio *btrfs_bio_alloc(unsigned int nr_vecs, blk_opf_t opf,
btrfs_bio_end_io_t end_io, void *private)
{
struct bio *bio;
bio = bio_alloc_bioset(NULL, nr_vecs, opf, GFP_NOFS, &btrfs_bioset);
btrfs_bio_init(btrfs_bio(bio), end_io, private);
return bio;
}
struct bio *btrfs_bio_clone_partial(struct bio *orig, u64 offset, u64 size,
btrfs_bio_end_io_t end_io, void *private)
{
struct bio *bio;
struct btrfs_bio *bbio;
ASSERT(offset <= UINT_MAX && size <= UINT_MAX);
bio = bio_alloc_clone(orig->bi_bdev, orig, GFP_NOFS, &btrfs_bioset);
bbio = btrfs_bio(bio);
btrfs_bio_init(bbio, end_io, private);
bio_trim(bio, offset >> 9, size >> 9);
bbio->iter = bio->bi_iter;
return bio;
}
static void btrfs_log_dev_io_error(struct bio *bio, struct btrfs_device *dev)
{
if (!dev || !dev->bdev)
return;
if (bio->bi_status != BLK_STS_IOERR && bio->bi_status != BLK_STS_TARGET)
return;
if (btrfs_op(bio) == BTRFS_MAP_WRITE)
btrfs_dev_stat_inc_and_print(dev, BTRFS_DEV_STAT_WRITE_ERRS);
if (!(bio->bi_opf & REQ_RAHEAD))
btrfs_dev_stat_inc_and_print(dev, BTRFS_DEV_STAT_READ_ERRS);
if (bio->bi_opf & REQ_PREFLUSH)
btrfs_dev_stat_inc_and_print(dev, BTRFS_DEV_STAT_FLUSH_ERRS);
}
static struct workqueue_struct *btrfs_end_io_wq(struct btrfs_fs_info *fs_info,
struct bio *bio)
{
if (bio->bi_opf & REQ_META)
return fs_info->endio_meta_workers;
return fs_info->endio_workers;
}
static void btrfs_end_bio_work(struct work_struct *work)
{
struct btrfs_bio *bbio = container_of(work, struct btrfs_bio, end_io_work);
bbio->end_io(bbio);
}
static void btrfs_simple_end_io(struct bio *bio)
{
struct btrfs_fs_info *fs_info = bio->bi_private;
struct btrfs_bio *bbio = btrfs_bio(bio);
btrfs_bio_counter_dec(fs_info);
if (bio->bi_status)
btrfs_log_dev_io_error(bio, bbio->device);
if (bio_op(bio) == REQ_OP_READ) {
INIT_WORK(&bbio->end_io_work, btrfs_end_bio_work);
queue_work(btrfs_end_io_wq(fs_info, bio), &bbio->end_io_work);
} else {
bbio->end_io(bbio);
}
}
static void btrfs_raid56_end_io(struct bio *bio)
{
struct btrfs_io_context *bioc = bio->bi_private;
struct btrfs_bio *bbio = btrfs_bio(bio);
btrfs_bio_counter_dec(bioc->fs_info);
bbio->mirror_num = bioc->mirror_num;
bbio->end_io(bbio);
btrfs_put_bioc(bioc);
}
static void btrfs_orig_write_end_io(struct bio *bio)
{
struct btrfs_io_stripe *stripe = bio->bi_private;
struct btrfs_io_context *bioc = stripe->bioc;
struct btrfs_bio *bbio = btrfs_bio(bio);
btrfs_bio_counter_dec(bioc->fs_info);
if (bio->bi_status) {
atomic_inc(&bioc->error);
btrfs_log_dev_io_error(bio, stripe->dev);
}
/*
* Only send an error to the higher layers if it is beyond the tolerance
* threshold.
*/
if (atomic_read(&bioc->error) > bioc->max_errors)
bio->bi_status = BLK_STS_IOERR;
else
bio->bi_status = BLK_STS_OK;
bbio->end_io(bbio);
btrfs_put_bioc(bioc);
}
static void btrfs_clone_write_end_io(struct bio *bio)
{
struct btrfs_io_stripe *stripe = bio->bi_private;
if (bio->bi_status) {
atomic_inc(&stripe->bioc->error);
btrfs_log_dev_io_error(bio, stripe->dev);
}
/* Pass on control to the original bio this one was cloned from */
bio_endio(stripe->bioc->orig_bio);
bio_put(bio);
}
static void btrfs_submit_dev_bio(struct btrfs_device *dev, struct bio *bio)
{
if (!dev || !dev->bdev ||
test_bit(BTRFS_DEV_STATE_MISSING, &dev->dev_state) ||
(btrfs_op(bio) == BTRFS_MAP_WRITE &&
!test_bit(BTRFS_DEV_STATE_WRITEABLE, &dev->dev_state))) {
bio_io_error(bio);
return;
}
bio_set_dev(bio, dev->bdev);
/*
* For zone append writing, bi_sector must point the beginning of the
* zone
*/
if (bio_op(bio) == REQ_OP_ZONE_APPEND) {
u64 physical = bio->bi_iter.bi_sector << SECTOR_SHIFT;
if (btrfs_dev_is_sequential(dev, physical)) {
u64 zone_start = round_down(physical,
dev->fs_info->zone_size);
bio->bi_iter.bi_sector = zone_start >> SECTOR_SHIFT;
} else {
bio->bi_opf &= ~REQ_OP_ZONE_APPEND;
bio->bi_opf |= REQ_OP_WRITE;
}
}
btrfs_debug_in_rcu(dev->fs_info,
"%s: rw %d 0x%x, sector=%llu, dev=%lu (%s id %llu), size=%u",
__func__, bio_op(bio), bio->bi_opf, bio->bi_iter.bi_sector,
(unsigned long)dev->bdev->bd_dev, btrfs_dev_name(dev),
dev->devid, bio->bi_iter.bi_size);
btrfsic_check_bio(bio);
submit_bio(bio);
}
static void btrfs_submit_mirrored_bio(struct btrfs_io_context *bioc, int dev_nr)
{
struct bio *orig_bio = bioc->orig_bio, *bio;
ASSERT(bio_op(orig_bio) != REQ_OP_READ);
/* Reuse the bio embedded into the btrfs_bio for the last mirror */
if (dev_nr == bioc->num_stripes - 1) {
bio = orig_bio;
bio->bi_end_io = btrfs_orig_write_end_io;
} else {
bio = bio_alloc_clone(NULL, orig_bio, GFP_NOFS, &fs_bio_set);
bio_inc_remaining(orig_bio);
bio->bi_end_io = btrfs_clone_write_end_io;
}
bio->bi_private = &bioc->stripes[dev_nr];
bio->bi_iter.bi_sector = bioc->stripes[dev_nr].physical >> SECTOR_SHIFT;
bioc->stripes[dev_nr].bioc = bioc;
btrfs_submit_dev_bio(bioc->stripes[dev_nr].dev, bio);
}
void btrfs_submit_bio(struct btrfs_fs_info *fs_info, struct bio *bio, int mirror_num)
{
u64 logical = bio->bi_iter.bi_sector << 9;
u64 length = bio->bi_iter.bi_size;
u64 map_length = length;
struct btrfs_io_context *bioc = NULL;
struct btrfs_io_stripe smap;
int ret;
btrfs_bio_counter_inc_blocked(fs_info);
ret = __btrfs_map_block(fs_info, btrfs_op(bio), logical, &map_length,
&bioc, &smap, &mirror_num, 1);
if (ret) {
btrfs_bio_counter_dec(fs_info);
btrfs_bio_end_io(btrfs_bio(bio), errno_to_blk_status(ret));
return;
}
if (map_length < length) {
btrfs_crit(fs_info,
"mapping failed logical %llu bio len %llu len %llu",
logical, length, map_length);
BUG();
}
if (!bioc) {
/* Single mirror read/write fast path */
btrfs_bio(bio)->mirror_num = mirror_num;
btrfs_bio(bio)->device = smap.dev;
bio->bi_iter.bi_sector = smap.physical >> SECTOR_SHIFT;
bio->bi_private = fs_info;
bio->bi_end_io = btrfs_simple_end_io;
btrfs_submit_dev_bio(smap.dev, bio);
} else if (bioc->map_type & BTRFS_BLOCK_GROUP_RAID56_MASK) {
/* Parity RAID write or read recovery */
bio->bi_private = bioc;
bio->bi_end_io = btrfs_raid56_end_io;
if (bio_op(bio) == REQ_OP_READ)
raid56_parity_recover(bio, bioc, mirror_num);
else
raid56_parity_write(bio, bioc);
} else {
/* Write to multiple mirrors */
int total_devs = bioc->num_stripes;
int dev_nr;
bioc->orig_bio = bio;
for (dev_nr = 0; dev_nr < total_devs; dev_nr++)
btrfs_submit_mirrored_bio(bioc, dev_nr);
}
}
/*
* Submit a repair write.
*
* This bypasses btrfs_submit_bio deliberately, as that writes all copies in a
* RAID setup. Here we only want to write the one bad copy, so we do the
* mapping ourselves and submit the bio directly.
*
* The I/O is issued sychronously to block the repair read completion from
* freeing the bio.
*/
int btrfs_repair_io_failure(struct btrfs_fs_info *fs_info, u64 ino, u64 start,
u64 length, u64 logical, struct page *page,
unsigned int pg_offset, int mirror_num)
{
struct btrfs_device *dev;
struct bio_vec bvec;
struct bio bio;
u64 map_length = 0;
u64 sector;
struct btrfs_io_context *bioc = NULL;
int ret = 0;
ASSERT(!(fs_info->sb->s_flags & SB_RDONLY));
BUG_ON(!mirror_num);
if (btrfs_repair_one_zone(fs_info, logical))
return 0;
map_length = length;
/*
* Avoid races with device replace and make sure our bioc has devices
* associated to its stripes that don't go away while we are doing the
* read repair operation.
*/
btrfs_bio_counter_inc_blocked(fs_info);
if (btrfs_is_parity_mirror(fs_info, logical, length)) {
/*
* Note that we don't use BTRFS_MAP_WRITE because it's supposed
* to update all raid stripes, but here we just want to correct
* bad stripe, thus BTRFS_MAP_READ is abused to only get the bad
* stripe's dev and sector.
*/
ret = btrfs_map_block(fs_info, BTRFS_MAP_READ, logical,
&map_length, &bioc, 0);
if (ret)
goto out_counter_dec;
ASSERT(bioc->mirror_num == 1);
} else {
ret = btrfs_map_block(fs_info, BTRFS_MAP_WRITE, logical,
&map_length, &bioc, mirror_num);
if (ret)
goto out_counter_dec;
BUG_ON(mirror_num != bioc->mirror_num);
}
sector = bioc->stripes[bioc->mirror_num - 1].physical >> 9;
dev = bioc->stripes[bioc->mirror_num - 1].dev;
btrfs_put_bioc(bioc);
if (!dev || !dev->bdev ||
!test_bit(BTRFS_DEV_STATE_WRITEABLE, &dev->dev_state)) {
ret = -EIO;
goto out_counter_dec;
}
bio_init(&bio, dev->bdev, &bvec, 1, REQ_OP_WRITE | REQ_SYNC);
bio.bi_iter.bi_sector = sector;
__bio_add_page(&bio, page, length, pg_offset);
btrfsic_check_bio(&bio);
ret = submit_bio_wait(&bio);
if (ret) {
/* try to remap that extent elsewhere? */
btrfs_dev_stat_inc_and_print(dev, BTRFS_DEV_STAT_WRITE_ERRS);
goto out_bio_uninit;
}
btrfs_info_rl_in_rcu(fs_info,
"read error corrected: ino %llu off %llu (dev %s sector %llu)",
ino, start, btrfs_dev_name(dev), sector);
ret = 0;
out_bio_uninit:
bio_uninit(&bio);
out_counter_dec:
btrfs_bio_counter_dec(fs_info);
return ret;
}
int __init btrfs_bioset_init(void)
{
if (bioset_init(&btrfs_bioset, BIO_POOL_SIZE,
offsetof(struct btrfs_bio, bio),
BIOSET_NEED_BVECS))
return -ENOMEM;
return 0;
}
void __cold btrfs_bioset_exit(void)
{
bioset_exit(&btrfs_bioset);
}