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