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btrfs: split zone append bios in btrfs_submit_bio

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The current btrfs zoned device support is a little cumbersome in the data
I/O path as it requires the callers to not issue I/O larger than the
supported ZONE_APPEND size of the underlying device.  This leads to a lot
of extra accounting.  Instead change btrfs_submit_bio so that it can take
write bios of arbitrary size and form from the upper layers, and just
split them internally to the ZONE_APPEND queue limits.  Then remove all
the upper layer warts catering to limited write sized on zoned devices,
including the extra refcount in the compressed_bio.

Reviewed-by: Josef Bacik <josef@toxicpanda.com>
Reviewed-by: Johannes Thumshirn <johannes.thumshirn@wdc.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: David Sterba <dsterba@suse.com>
This commit is contained in:
Christoph Hellwig 2023-01-21 07:50:30 +01:00 committed by David Sterba
parent 243cf8d1b6
commit d5e4377d50
7 changed files with 63 additions and 199 deletions
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44
fs/btrfs/bio.c
View file

@ -59,13 +59,22 @@ struct bio *btrfs_bio_alloc(unsigned int nr_vecs, blk_opf_t opf,
return bio;
}
static struct bio *btrfs_split_bio(struct bio *orig, u64 map_length)
static struct bio *btrfs_split_bio(struct btrfs_fs_info *fs_info,
struct bio *orig, u64 map_length,
bool use_append)
{
struct btrfs_bio *orig_bbio = btrfs_bio(orig);
struct bio *bio;
bio = bio_split(orig, map_length >> SECTOR_SHIFT, GFP_NOFS,
&btrfs_clone_bioset);
if (use_append) {
unsigned int nr_segs;
bio = bio_split_rw(orig, &fs_info->limits, &nr_segs,
&btrfs_clone_bioset, map_length);
} else {
bio = bio_split(orig, map_length >> SECTOR_SHIFT, GFP_NOFS,
&btrfs_clone_bioset);
}
btrfs_bio_init(btrfs_bio(bio), orig_bbio->inode, NULL, orig_bbio);
btrfs_bio(bio)->file_offset = orig_bbio->file_offset;
@ -397,16 +406,10 @@ static void btrfs_submit_dev_bio(struct btrfs_device *dev, struct bio *bio)
*/
if (bio_op(bio) == REQ_OP_ZONE_APPEND) {
u64 physical = bio->bi_iter.bi_sector << SECTOR_SHIFT;
u64 zone_start = round_down(physical, dev->fs_info->zone_size);
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;
}
ASSERT(btrfs_dev_is_sequential(dev, physical));
bio->bi_iter.bi_sector = zone_start >> SECTOR_SHIFT;
}
btrfs_debug_in_rcu(dev->fs_info,
"%s: rw %d 0x%x, sector=%llu, dev=%lu (%s id %llu), size=%u",
@ -603,11 +606,13 @@ static bool btrfs_wq_submit_bio(struct btrfs_bio *bbio,
static bool btrfs_submit_chunk(struct bio *bio, int mirror_num)
{
struct btrfs_bio *bbio = btrfs_bio(bio);
struct btrfs_fs_info *fs_info = bbio->inode->root->fs_info;
struct btrfs_inode *inode = bbio->inode;
struct btrfs_fs_info *fs_info = inode->root->fs_info;
struct btrfs_bio *orig_bbio = bbio;
u64 logical = bio->bi_iter.bi_sector << 9;
u64 length = bio->bi_iter.bi_size;
u64 map_length = length;
bool use_append = btrfs_use_zone_append(inode, logical);
struct btrfs_io_context *bioc = NULL;
struct btrfs_io_stripe smap;
blk_status_t ret;
@ -622,8 +627,11 @@ static bool btrfs_submit_chunk(struct bio *bio, int mirror_num)
}
map_length = min(map_length, length);
if (use_append)
map_length = min(map_length, fs_info->max_zone_append_size);
if (map_length < length) {
bio = btrfs_split_bio(bio, map_length);
bio = btrfs_split_bio(fs_info, bio, map_length, use_append);
bbio = btrfs_bio(bio);
}
@ -639,7 +647,9 @@ static bool btrfs_submit_chunk(struct bio *bio, int mirror_num)
}
if (btrfs_op(bio) == BTRFS_MAP_WRITE) {
if (bio_op(bio) == REQ_OP_ZONE_APPEND) {
if (use_append) {
bio->bi_opf &= ~REQ_OP_WRITE;
bio->bi_opf |= REQ_OP_ZONE_APPEND;
ret = btrfs_extract_ordered_extent(btrfs_bio(bio));
if (ret)
goto fail_put_bio;
@ -649,9 +659,9 @@ static bool btrfs_submit_chunk(struct bio *bio, int mirror_num)
* Csum items for reloc roots have already been cloned at this
* point, so they are handled as part of the no-checksum case.
*/
if (!(bbio->inode->flags & BTRFS_INODE_NODATASUM) &&
if (!(inode->flags & BTRFS_INODE_NODATASUM) &&
!test_bit(BTRFS_FS_STATE_NO_CSUMS, &fs_info->fs_state) &&
!btrfs_is_data_reloc_root(bbio->inode->root)) {
!btrfs_is_data_reloc_root(inode->root)) {
if (should_async_write(bbio) &&
btrfs_wq_submit_bio(bbio, bioc, &smap, mirror_num))
goto done;

110
fs/btrfs/compression.c
View file

@ -258,57 +258,14 @@ static void btrfs_finish_compressed_write_work(struct work_struct *work)
static void end_compressed_bio_write(struct btrfs_bio *bbio)
{
struct compressed_bio *cb = bbio->private;
struct btrfs_fs_info *fs_info = btrfs_sb(cb->inode->i_sb);
if (bbio->bio.bi_status)
cb->status = bbio->bio.bi_status;
cb->status = bbio->bio.bi_status;
queue_work(fs_info->compressed_write_workers, &cb->write_end_work);
if (refcount_dec_and_test(&cb->pending_ios)) {
struct btrfs_fs_info *fs_info = btrfs_sb(cb->inode->i_sb);
queue_work(fs_info->compressed_write_workers, &cb->write_end_work);
}
bio_put(&bbio->bio);
}
/*
* Allocate a compressed_bio, which will be used to read/write on-disk
* (aka, compressed) * data.
*
* @cb: The compressed_bio structure, which records all the needed
* information to bind the compressed data to the uncompressed
* page cache.
* @disk_byten: The logical bytenr where the compressed data will be read
* from or written to.
* @endio_func: The endio function to call after the IO for compressed data
* is finished.
*/
static struct bio *alloc_compressed_bio(struct compressed_bio *cb, u64 disk_bytenr,
blk_opf_t opf,
btrfs_bio_end_io_t endio_func)
{
struct bio *bio;
bio = btrfs_bio_alloc(BIO_MAX_VECS, opf, BTRFS_I(cb->inode), endio_func,
cb);
bio->bi_iter.bi_sector = disk_bytenr >> SECTOR_SHIFT;
if (bio_op(bio) == REQ_OP_ZONE_APPEND) {
struct btrfs_fs_info *fs_info = btrfs_sb(cb->inode->i_sb);
struct btrfs_device *device;
device = btrfs_zoned_get_device(fs_info, disk_bytenr,
fs_info->sectorsize);
if (IS_ERR(device)) {
bio_put(bio);
return ERR_CAST(device);
}
bio_set_dev(bio, device->bdev);
}
refcount_inc(&cb->pending_ios);
return bio;
}
/*
* worker function to build and submit bios for previously compressed pages.
* The corresponding pages in the inode should be marked for writeback
@ -332,16 +289,12 @@ blk_status_t btrfs_submit_compressed_write(struct btrfs_inode *inode, u64 start,
struct compressed_bio *cb;
u64 cur_disk_bytenr = disk_start;
blk_status_t ret = BLK_STS_OK;
const bool use_append = btrfs_use_zone_append(inode, disk_start);
const enum req_op bio_op = REQ_BTRFS_ONE_ORDERED |
(use_append ? REQ_OP_ZONE_APPEND : REQ_OP_WRITE);
ASSERT(IS_ALIGNED(start, fs_info->sectorsize) &&
IS_ALIGNED(len, fs_info->sectorsize));
cb = kmalloc(sizeof(struct compressed_bio), GFP_NOFS);
if (!cb)
return BLK_STS_RESOURCE;
refcount_set(&cb->pending_ios, 1);
cb->status = BLK_STS_OK;
cb->inode = &inode->vfs_inode;
cb->start = start;
@ -352,8 +305,16 @@ blk_status_t btrfs_submit_compressed_write(struct btrfs_inode *inode, u64 start,
INIT_WORK(&cb->write_end_work, btrfs_finish_compressed_write_work);
cb->nr_pages = nr_pages;
if (blkcg_css)
if (blkcg_css) {
kthread_associate_blkcg(blkcg_css);
write_flags |= REQ_CGROUP_PUNT;
}
write_flags |= REQ_BTRFS_ONE_ORDERED;
bio = btrfs_bio_alloc(BIO_MAX_VECS, REQ_OP_WRITE | write_flags,
BTRFS_I(cb->inode), end_compressed_bio_write, cb);
bio->bi_iter.bi_sector = cur_disk_bytenr >> SECTOR_SHIFT;
btrfs_bio(bio)->file_offset = start;
while (cur_disk_bytenr < disk_start + compressed_len) {
u64 offset = cur_disk_bytenr - disk_start;
@ -361,20 +322,7 @@ blk_status_t btrfs_submit_compressed_write(struct btrfs_inode *inode, u64 start,
unsigned int real_size;
unsigned int added;
struct page *page = compressed_pages[index];
bool submit = false;
/* Allocate new bio if submitted or not yet allocated */
if (!bio) {
bio = alloc_compressed_bio(cb, cur_disk_bytenr,
bio_op | write_flags, end_compressed_bio_write);
if (IS_ERR(bio)) {
ret = errno_to_blk_status(PTR_ERR(bio));
break;
}
btrfs_bio(bio)->file_offset = start;
if (blkcg_css)
bio->bi_opf |= REQ_CGROUP_PUNT;
}
/*
* We have various limits on the real read size:
* - page boundary
@ -384,35 +332,20 @@ blk_status_t btrfs_submit_compressed_write(struct btrfs_inode *inode, u64 start,
real_size = min_t(u64, real_size, compressed_len - offset);
ASSERT(IS_ALIGNED(real_size, fs_info->sectorsize));
if (use_append)
added = bio_add_zone_append_page(bio, page, real_size,
offset_in_page(offset));
else
added = bio_add_page(bio, page, real_size,
offset_in_page(offset));
/* Reached zoned boundary */
if (added == 0)
submit = true;
added = bio_add_page(bio, page, real_size, offset_in_page(offset));
/*
* Maximum compressed extent is smaller than bio size limit,
* thus bio_add_page() should always success.
*/
ASSERT(added == real_size);
cur_disk_bytenr += added;
/* Finished the range */
if (cur_disk_bytenr == disk_start + compressed_len)
submit = true;
if (submit) {
ASSERT(bio->bi_iter.bi_size);
btrfs_submit_bio(bio, 0);
bio = NULL;
}
cond_resched();
}
/* Finished the range. */
ASSERT(bio->bi_iter.bi_size);
btrfs_submit_bio(bio, 0);
if (blkcg_css)
kthread_associate_blkcg(NULL);
if (refcount_dec_and_test(&cb->pending_ios))
finish_compressed_bio_write(cb);
return ret;
}
@ -624,7 +557,6 @@ void btrfs_submit_compressed_read(struct inode *inode, struct bio *bio,
goto out;
}
refcount_set(&cb->pending_ios, 1);
cb->status = BLK_STS_OK;
cb->inode = inode;

3
fs/btrfs/compression.h
View file

@ -31,9 +31,6 @@ static_assert((BTRFS_MAX_COMPRESSED % PAGE_SIZE) == 0);
#define BTRFS_ZLIB_DEFAULT_LEVEL 3
struct compressed_bio {
/* Number of outstanding bios */
refcount_t pending_ios;
/* Number of compressed pages in the array */
unsigned int nr_pages;

72
fs/btrfs/extent_io.c
View file

@ -896,7 +896,6 @@ static int btrfs_bio_add_page(struct btrfs_bio_ctrl *bio_ctrl,
u32 real_size;
const sector_t sector = disk_bytenr >> SECTOR_SHIFT;
bool contig = false;
int ret;
ASSERT(bio);
/* The limit should be calculated when bio_ctrl->bio is allocated */
@ -945,12 +944,7 @@ static int btrfs_bio_add_page(struct btrfs_bio_ctrl *bio_ctrl,
if (real_size == 0)
return 0;
if (bio_op(bio) == REQ_OP_ZONE_APPEND)
ret = bio_add_zone_append_page(bio, page, real_size, pg_offset);
else
ret = bio_add_page(bio, page, real_size, pg_offset);
return ret;
return bio_add_page(bio, page, real_size, pg_offset);
}
static void calc_bio_boundaries(struct btrfs_bio_ctrl *bio_ctrl,
@ -965,7 +959,7 @@ static void calc_bio_boundaries(struct btrfs_bio_ctrl *bio_ctrl,
* them.
*/
if (bio_ctrl->compress_type == BTRFS_COMPRESS_NONE &&
bio_op(bio_ctrl->bio) == REQ_OP_ZONE_APPEND) {
btrfs_use_zone_append(inode, logical)) {
ordered = btrfs_lookup_ordered_extent(inode, file_offset);
if (ordered) {
bio_ctrl->len_to_oe_boundary = min_t(u32, U32_MAX,
@ -979,16 +973,14 @@ static void calc_bio_boundaries(struct btrfs_bio_ctrl *bio_ctrl,
bio_ctrl->len_to_oe_boundary = U32_MAX;
}
static int alloc_new_bio(struct btrfs_inode *inode,
struct btrfs_bio_ctrl *bio_ctrl,
struct writeback_control *wbc,
blk_opf_t opf,
u64 disk_bytenr, u32 offset, u64 file_offset,
enum btrfs_compression_type compress_type)
static void alloc_new_bio(struct btrfs_inode *inode,
struct btrfs_bio_ctrl *bio_ctrl,
struct writeback_control *wbc, blk_opf_t opf,
u64 disk_bytenr, u32 offset, u64 file_offset,
enum btrfs_compression_type compress_type)
{
struct btrfs_fs_info *fs_info = inode->root->fs_info;
struct bio *bio;
int ret;
bio = btrfs_bio_alloc(BIO_MAX_VECS, opf, inode, bio_ctrl->end_io_func,
NULL);
@ -1006,40 +998,14 @@ static int alloc_new_bio(struct btrfs_inode *inode,
if (wbc) {
/*
* For Zone append we need the correct block_device that we are
* going to write to set in the bio to be able to respect the
* hardware limitation. Look it up here:
* Pick the last added device to support cgroup writeback. For
* multi-device file systems this means blk-cgroup policies have
* to always be set on the last added/replaced device.
* This is a bit odd but has been like that for a long time.
*/
if (bio_op(bio) == REQ_OP_ZONE_APPEND) {
struct btrfs_device *dev;
dev = btrfs_zoned_get_device(fs_info, disk_bytenr,
fs_info->sectorsize);
if (IS_ERR(dev)) {
ret = PTR_ERR(dev);
goto error;
}
bio_set_dev(bio, dev->bdev);
} else {
/*
* Otherwise pick the last added device to support
* cgroup writeback. For multi-device file systems this
* means blk-cgroup policies have to always be set on the
* last added/replaced device. This is a bit odd but has
* been like that for a long time.
*/
bio_set_dev(bio, fs_info->fs_devices->latest_dev->bdev);
}
bio_set_dev(bio, fs_info->fs_devices->latest_dev->bdev);
wbc_init_bio(wbc, bio);
} else {
ASSERT(bio_op(bio) != REQ_OP_ZONE_APPEND);
}
return 0;
error:
bio_ctrl->bio = NULL;
btrfs_bio_end_io(btrfs_bio(bio), errno_to_blk_status(ret));
return ret;
}
/*
@ -1065,7 +1031,6 @@ static int submit_extent_page(blk_opf_t opf,
enum btrfs_compression_type compress_type,
bool force_bio_submit)
{
int ret = 0;
struct btrfs_inode *inode = BTRFS_I(page->mapping->host);
unsigned int cur = pg_offset;
@ -1085,12 +1050,9 @@ static int submit_extent_page(blk_opf_t opf,
/* Allocate new bio if needed */
if (!bio_ctrl->bio) {
ret = alloc_new_bio(inode, bio_ctrl, wbc, opf,
disk_bytenr, offset,
page_offset(page) + cur,
compress_type);
if (ret < 0)
return ret;
alloc_new_bio(inode, bio_ctrl, wbc, opf, disk_bytenr,
offset, page_offset(page) + cur,
compress_type);
}
/*
* We must go through btrfs_bio_add_page() to ensure each
@ -1647,10 +1609,6 @@ static noinline_for_stack int __extent_writepage_io(struct btrfs_inode *inode,
* find_next_dirty_byte() are all exclusive
*/
iosize = min(min(em_end, end + 1), dirty_range_end) - cur;
if (btrfs_use_zone_append(inode, em->block_start))
op = REQ_OP_ZONE_APPEND;
free_extent_map(em);
em = NULL;

4
fs/btrfs/inode.c
View file

@ -7678,10 +7678,6 @@ static int btrfs_dio_iomap_begin(struct inode *inode, loff_t start,
iomap->offset = start;
iomap->bdev = fs_info->fs_devices->latest_dev->bdev;
iomap->length = len;
if (write && btrfs_use_zone_append(BTRFS_I(inode), em->block_start))
iomap->flags |= IOMAP_F_ZONE_APPEND;
free_extent_map(em);
return 0;

20
fs/btrfs/zoned.c
View file

@ -1845,26 +1845,6 @@ int btrfs_sync_zone_write_pointer(struct btrfs_device *tgt_dev, u64 logical,
return btrfs_zoned_issue_zeroout(tgt_dev, physical_pos, length);
}
struct btrfs_device *btrfs_zoned_get_device(struct btrfs_fs_info *fs_info,
u64 logical, u64 length)
{
struct btrfs_device *device;
struct extent_map *em;
struct map_lookup *map;
em = btrfs_get_chunk_map(fs_info, logical, length);
if (IS_ERR(em))
return ERR_CAST(em);
map = em->map_lookup;
/* We only support single profile for now */
device = map->stripes[0].dev;
free_extent_map(em);
return device;
}
/*
* Activate block group and underlying device zones
*

9
fs/btrfs/zoned.h
View file

@ -66,8 +66,6 @@ void btrfs_revert_meta_write_pointer(struct btrfs_block_group *cache,
int btrfs_zoned_issue_zeroout(struct btrfs_device *device, u64 physical, u64 length);
int btrfs_sync_zone_write_pointer(struct btrfs_device *tgt_dev, u64 logical,
u64 physical_start, u64 physical_pos);
struct btrfs_device *btrfs_zoned_get_device(struct btrfs_fs_info *fs_info,
u64 logical, u64 length);
bool btrfs_zone_activate(struct btrfs_block_group *block_group);
int btrfs_zone_finish(struct btrfs_block_group *block_group);
bool btrfs_can_activate_zone(struct btrfs_fs_devices *fs_devices, u64 flags);
@ -221,13 +219,6 @@ static inline int btrfs_sync_zone_write_pointer(struct btrfs_device *tgt_dev,
return -EOPNOTSUPP;
}
static inline struct btrfs_device *btrfs_zoned_get_device(
struct btrfs_fs_info *fs_info,
u64 logical, u64 length)
{
return ERR_PTR(-EOPNOTSUPP);
}
static inline bool btrfs_zone_activate(struct btrfs_block_group *block_group)
{
return true;