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btrfs: split the bio submission path into a separate file 

The code used by btrfs_submit_bio only interacts with the rest of
volumes.c through __btrfs_map_block (which itself is a more generic
version of two exported helpers) and does not really have anything
to do with volumes.c.  Create a new bio.c file and a bio.h header
going along with it for the btrfs_bio-based storage layer, which
will grow even more going forward.

Also update the file with my copyright notice given that a large
part of the moved code was written or rewritten by me.

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>
This commit is contained in:
Christoph Hellwig 2022-11-15 10:44:05 +01:00 committed by David Sterba
parent 27137fac4c
commit 103c19723c
14 changed files with 438 additions and 403 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
fs/btrfs/Makefile
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@ -31,7 +31,7 @@ btrfs-y += super.o ctree.o extent-tree.o print-tree.o root-tree.o dir-item.o \
backref.o ulist.o qgroup.o send.o dev-replace.o raid56.o \
uuid-tree.o props.o free-space-tree.o tree-checker.o space-info.o \
block-rsv.o delalloc-space.o block-group.o discard.o reflink.o \
subpage.o tree-mod-log.o extent-io-tree.o fs.o messages.o
subpage.o tree-mod-log.o extent-io-tree.o fs.o messages.o bio.o
btrfs-$(CONFIG_BTRFS_FS_POSIX_ACL) += acl.o
btrfs-$(CONFIG_BTRFS_FS_CHECK_INTEGRITY) += check-integrity.o

291
fs/btrfs/bio.c Normal file
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@ -0,0 +1,291 @@
// 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);
}
}
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);
}

127
fs/btrfs/bio.h Normal file
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@ -0,0 +1,127 @@
/* SPDX-License-Identifier: GPL-2.0 */
/*
* Copyright (C) 2007 Oracle. All rights reserved.
* Copyright (C) 2022 Christoph Hellwig.
*/
#ifndef BTRFS_BIO_H
#define BTRFS_BIO_H
#include <linux/bio.h>
#include <linux/workqueue.h>
#include "tree-checker.h"
struct btrfs_bio;
struct btrfs_fs_info;
#define BTRFS_BIO_INLINE_CSUM_SIZE 64
/*
* Maximum number of sectors for a single bio to limit the size of the
* checksum array. This matches the number of bio_vecs per bio and thus the
* I/O size for buffered I/O.
*/
#define BTRFS_MAX_BIO_SECTORS (256)
typedef void (*btrfs_bio_end_io_t)(struct btrfs_bio *bbio);
/*
* Additional info to pass along bio.
*
* Mostly for btrfs specific features like csum and mirror_num.
*/
struct btrfs_bio {
unsigned int mirror_num:7;
/*
* Extra indicator for metadata bios.
* For some btrfs bios they use pages without a mapping, thus
* we can not rely on page->mapping->host to determine if
* it's a metadata bio.
*/
unsigned int is_metadata:1;
struct bvec_iter iter;
/* for direct I/O */
u64 file_offset;
/* @device is for stripe IO submission. */
struct btrfs_device *device;
union {
/* For data checksum verification. */
struct {
u8 *csum;
u8 csum_inline[BTRFS_BIO_INLINE_CSUM_SIZE];
};
/* For metadata parentness verification. */
struct btrfs_tree_parent_check parent_check;
};
/* End I/O information supplied to btrfs_bio_alloc */
btrfs_bio_end_io_t end_io;
void *private;
/* For read end I/O handling */
struct work_struct end_io_work;
/*
* This member must come last, bio_alloc_bioset will allocate enough
* bytes for entire btrfs_bio but relies on bio being last.
*/
struct bio bio;
};
static inline struct btrfs_bio *btrfs_bio(struct bio *bio)
{
return container_of(bio, struct btrfs_bio, bio);
}
int __init btrfs_bioset_init(void);
void __cold btrfs_bioset_exit(void);
struct bio *btrfs_bio_alloc(unsigned int nr_vecs, blk_opf_t opf,
btrfs_bio_end_io_t end_io, void *private);
struct bio *btrfs_bio_clone_partial(struct bio *orig, u64 offset, u64 size,
btrfs_bio_end_io_t end_io, void *private);
static inline void btrfs_bio_end_io(struct btrfs_bio *bbio, blk_status_t status)
{
bbio->bio.bi_status = status;
bbio->end_io(bbio);
}
static inline void btrfs_bio_free_csum(struct btrfs_bio *bbio)
{
if (bbio->is_metadata)
return;
if (bbio->csum != bbio->csum_inline) {
kfree(bbio->csum);
bbio->csum = NULL;
}
}
/*
* Iterate through a btrfs_bio (@bbio) on a per-sector basis.
*
* bvl - struct bio_vec
* bbio - struct btrfs_bio
* iters - struct bvec_iter
* bio_offset - unsigned int
*/
#define btrfs_bio_for_each_sector(fs_info, bvl, bbio, iter, bio_offset) \
for ((iter) = (bbio)->iter, (bio_offset) = 0; \
(iter).bi_size && \
(((bvl) = bio_iter_iovec((&(bbio)->bio), (iter))), 1); \
(bio_offset) += fs_info->sectorsize, \
bio_advance_iter_single(&(bbio)->bio, &(iter), \
(fs_info)->sectorsize))
void btrfs_submit_bio(struct btrfs_fs_info *fs_info, struct bio *bio,
int mirror_num);
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);
#endif

2
fs/btrfs/compression.c
View File

@ -27,7 +27,7 @@
#include "disk-io.h"
#include "transaction.h"
#include "btrfs_inode.h"
#include "volumes.h"
#include "bio.h"
#include "ordered-data.h"
#include "compression.h"
#include "extent_io.h"

2
fs/btrfs/disk-io.c
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@ -23,7 +23,7 @@
#include "disk-io.h"
#include "transaction.h"
#include "btrfs_inode.h"
#include "volumes.h"
#include "bio.h"
#include "print-tree.h"
#include "locking.h"
#include "tree-log.h"

1
fs/btrfs/extent-tree.c
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@ -42,6 +42,7 @@
#include "root-tree.h"
#include "file-item.h"
#include "orphan.h"
#include "tree-checker.h"
#undef SCRAMBLE_DELAYED_REFS

2
fs/btrfs/extent_io.c
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@ -20,7 +20,7 @@
#include "extent_map.h"
#include "ctree.h"
#include "btrfs_inode.h"
#include "volumes.h"
#include "bio.h"
#include "check-integrity.h"
#include "locking.h"
#include "rcu-string.h"

2
fs/btrfs/file-item.c
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@ -14,7 +14,7 @@
#include "ctree.h"
#include "disk-io.h"
#include "transaction.h"
#include "volumes.h"
#include "bio.h"
#include "print-tree.h"
#include "compression.h"
#include "fs.h"

2
fs/btrfs/inode.c
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@ -43,7 +43,7 @@
#include "ordered-data.h"
#include "xattr.h"
#include "tree-log.h"
#include "volumes.h"
#include "bio.h"
#include "compression.h"
#include "locking.h"
#include "free-space-cache.h"

1
fs/btrfs/relocation.c
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@ -35,6 +35,7 @@
#include "file-item.h"
#include "relocation.h"
#include "super.h"
#include "tree-checker.h"
/*
* Relocation overview

2
fs/btrfs/super.c
View File

@ -35,7 +35,7 @@
#include "print-tree.h"
#include "props.h"
#include "xattr.h"
#include "volumes.h"
#include "bio.h"
#include "export.h"
#include "compression.h"
#include "rcu-string.h"

1
fs/btrfs/tree-log.c
View File

@ -29,6 +29,7 @@
#include "file-item.h"
#include "file.h"
#include "orphan.h"
#include "tree-checker.h"
#define MAX_CONFLICT_INODES 10

296
fs/btrfs/volumes.c
View File

@ -5,12 +5,9 @@
#include <linux/sched.h>
#include <linux/sched/mm.h>
#include <linux/bio.h>
#include <linux/slab.h>
#include <linux/blkdev.h>
#include <linux/ratelimit.h>
#include <linux/kthread.h>
#include <linux/raid/pq.h>
#include <linux/semaphore.h>
#include <linux/uuid.h>
#include <linux/list_sort.h>
@ -23,8 +20,6 @@
#include "print-tree.h"
#include "volumes.h"
#include "raid56.h"
#include "async-thread.h"
#include "check-integrity.h"
#include "rcu-string.h"
#include "dev-replace.h"
#include "sysfs.h"
@ -41,8 +36,6 @@
#include "scrub.h"
#include "super.h"
static struct bio_set btrfs_bioset;
#define BTRFS_BLOCK_GROUP_STRIPE_MASK (BTRFS_BLOCK_GROUP_RAID0 | \
BTRFS_BLOCK_GROUP_RAID10 | \
BTRFS_BLOCK_GROUP_RAID56_MASK)
@ -255,11 +248,6 @@ out_overflow:;
static int init_first_rw_device(struct btrfs_trans_handle *trans);
static int btrfs_relocate_sys_chunks(struct btrfs_fs_info *fs_info);
static void btrfs_dev_stat_print_on_load(struct btrfs_device *device);
static int __btrfs_map_block(struct btrfs_fs_info *fs_info,
enum btrfs_map_op op, u64 logical, u64 *length,
struct btrfs_io_context **bioc_ret,
struct btrfs_io_stripe *smap,
int *mirror_num_ret, int need_raid_map);
/*
* Device locking
@ -6364,11 +6352,11 @@ static void set_io_stripe(struct btrfs_io_stripe *dst, const struct map_lookup *
stripe_offset + stripe_nr * map->stripe_len;
}
static int __btrfs_map_block(struct btrfs_fs_info *fs_info,
enum btrfs_map_op op, u64 logical, u64 *length,
struct btrfs_io_context **bioc_ret,
struct btrfs_io_stripe *smap,
int *mirror_num_ret, int need_raid_map)
int __btrfs_map_block(struct btrfs_fs_info *fs_info, enum btrfs_map_op op,
u64 logical, u64 *length,
struct btrfs_io_context **bioc_ret,
struct btrfs_io_stripe *smap, int *mirror_num_ret,
int need_raid_map)
{
struct extent_map *em;
struct map_lookup *map;
@ -6651,266 +6639,6 @@ int btrfs_map_sblock(struct btrfs_fs_info *fs_info, enum btrfs_map_op op,
NULL, NULL, 1);
}
/*
* 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);
}
}
static bool dev_args_match_fs_devices(const struct btrfs_dev_lookup_args *args,
const struct btrfs_fs_devices *fs_devices)
{
@ -8440,17 +8168,3 @@ bool btrfs_repair_one_zone(struct btrfs_fs_info *fs_info, u64 logical)
return true;
}
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);
}

110
fs/btrfs/volumes.h
View File

@ -6,7 +6,6 @@
#ifndef BTRFS_VOLUMES_H
#define BTRFS_VOLUMES_H
#include <linux/bio.h>
#include <linux/sort.h>
#include <linux/btrfs.h>
#include "async-thread.h"
@ -373,8 +372,6 @@ struct btrfs_fs_devices {
enum btrfs_read_policy read_policy;
};
#define BTRFS_BIO_INLINE_CSUM_SIZE 64
#define BTRFS_MAX_DEVS(info) ((BTRFS_MAX_ITEM_SIZE(info) \
- sizeof(struct btrfs_chunk)) \
/ sizeof(struct btrfs_stripe) + 1)
@ -384,107 +381,6 @@ struct btrfs_fs_devices {
- 2 * sizeof(struct btrfs_chunk)) \
/ sizeof(struct btrfs_stripe) + 1)
/*
* Maximum number of sectors for a single bio to limit the size of the
* checksum array. This matches the number of bio_vecs per bio and thus the
* I/O size for buffered I/O.
*/
#define BTRFS_MAX_BIO_SECTORS (256)
typedef void (*btrfs_bio_end_io_t)(struct btrfs_bio *bbio);
/*
* Additional info to pass along bio.
*
* Mostly for btrfs specific features like csum and mirror_num.
*/
struct btrfs_bio {
unsigned int mirror_num:7;
/*
* Extra indicator for metadata bios.
* For some btrfs bios they use pages without a mapping, thus
* we can not rely on page->mapping->host to determine if
* it's a metadata bio.
*/
unsigned int is_metadata:1;
struct bvec_iter iter;
/* for direct I/O */
u64 file_offset;
/* @device is for stripe IO submission. */
struct btrfs_device *device;
union {
/* For data checksum verification. */
struct {
u8 *csum;
u8 csum_inline[BTRFS_BIO_INLINE_CSUM_SIZE];
};
/* For metadata parentness verification. */
struct btrfs_tree_parent_check parent_check;
};
/* End I/O information supplied to btrfs_bio_alloc */
btrfs_bio_end_io_t end_io;
void *private;
/* For read end I/O handling */
struct work_struct end_io_work;
/*
* This member must come last, bio_alloc_bioset will allocate enough
* bytes for entire btrfs_bio but relies on bio being last.
*/
struct bio bio;
};
static inline struct btrfs_bio *btrfs_bio(struct bio *bio)
{
return container_of(bio, struct btrfs_bio, bio);
}
int __init btrfs_bioset_init(void);
void __cold btrfs_bioset_exit(void);
struct bio *btrfs_bio_alloc(unsigned int nr_vecs, blk_opf_t opf,
btrfs_bio_end_io_t end_io, void *private);
struct bio *btrfs_bio_clone_partial(struct bio *orig, u64 offset, u64 size,
btrfs_bio_end_io_t end_io, void *private);
static inline void btrfs_bio_end_io(struct btrfs_bio *bbio, blk_status_t status)
{
bbio->bio.bi_status = status;
bbio->end_io(bbio);
}
static inline void btrfs_bio_free_csum(struct btrfs_bio *bbio)
{
if (bbio->is_metadata)
return;
if (bbio->csum != bbio->csum_inline) {
kfree(bbio->csum);
bbio->csum = NULL;
}
}
/*
* Iterate through a btrfs_bio (@bbio) on a per-sector basis.
*
* bvl - struct bio_vec
* bbio - struct btrfs_bio
* iters - struct bvec_iter
* bio_offset - unsigned int
*/
#define btrfs_bio_for_each_sector(fs_info, bvl, bbio, iter, bio_offset) \
for ((iter) = (bbio)->iter, (bio_offset) = 0; \
(iter).bi_size && \
(((bvl) = bio_iter_iovec((&(bbio)->bio), (iter))), 1); \
(bio_offset) += fs_info->sectorsize, \
bio_advance_iter_single(&(bbio)->bio, &(iter), \
(fs_info)->sectorsize))
struct btrfs_io_stripe {
struct btrfs_device *dev;
union {
@ -641,6 +537,11 @@ int btrfs_map_block(struct btrfs_fs_info *fs_info, enum btrfs_map_op op,
int btrfs_map_sblock(struct btrfs_fs_info *fs_info, enum btrfs_map_op op,
u64 logical, u64 *length,
struct btrfs_io_context **bioc_ret);
int __btrfs_map_block(struct btrfs_fs_info *fs_info, enum btrfs_map_op op,
u64 logical, u64 *length,
struct btrfs_io_context **bioc_ret,
struct btrfs_io_stripe *smap, int *mirror_num_ret,
int need_raid_map);
struct btrfs_discard_stripe *btrfs_map_discard(struct btrfs_fs_info *fs_info,
u64 logical, u64 *length_ret,
u32 *num_stripes);
@ -652,7 +553,6 @@ int btrfs_read_chunk_tree(struct btrfs_fs_info *fs_info);
struct btrfs_block_group *btrfs_create_chunk(struct btrfs_trans_handle *trans,
u64 type);
void btrfs_mapping_tree_free(struct extent_map_tree *tree);
void btrfs_submit_bio(struct btrfs_fs_info *fs_info, struct bio *bio, int mirror_num);
int btrfs_open_devices(struct btrfs_fs_devices *fs_devices,
fmode_t flags, void *holder);
struct btrfs_device *btrfs_scan_one_device(const char *path,