btrfs: split zone append bios in btrfs_submit_bio
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
David Sterba
Родитель
243cf8d1b6
Коммит
d5e4377d50
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@ -59,13 +59,22 @@ struct bio *btrfs_bio_alloc(unsigned int nr_vecs, blk_opf_t opf,
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return bio;
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}
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static struct bio *btrfs_split_bio(struct bio *orig, u64 map_length)
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static struct bio *btrfs_split_bio(struct btrfs_fs_info *fs_info,
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struct bio *orig, u64 map_length,
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bool use_append)
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{
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struct btrfs_bio *orig_bbio = btrfs_bio(orig);
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struct bio *bio;
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bio = bio_split(orig, map_length >> SECTOR_SHIFT, GFP_NOFS,
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&btrfs_clone_bioset);
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if (use_append) {
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unsigned int nr_segs;
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bio = bio_split_rw(orig, &fs_info->limits, &nr_segs,
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&btrfs_clone_bioset, map_length);
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} else {
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bio = bio_split(orig, map_length >> SECTOR_SHIFT, GFP_NOFS,
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&btrfs_clone_bioset);
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}
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btrfs_bio_init(btrfs_bio(bio), orig_bbio->inode, NULL, orig_bbio);
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btrfs_bio(bio)->file_offset = orig_bbio->file_offset;
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@ -397,16 +406,10 @@ static void btrfs_submit_dev_bio(struct btrfs_device *dev, struct bio *bio)
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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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u64 zone_start = round_down(physical, dev->fs_info->zone_size);
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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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ASSERT(btrfs_dev_is_sequential(dev, physical));
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bio->bi_iter.bi_sector = zone_start >> SECTOR_SHIFT;
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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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@ -603,11 +606,13 @@ static bool btrfs_wq_submit_bio(struct btrfs_bio *bbio,
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static bool btrfs_submit_chunk(struct bio *bio, int mirror_num)
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{
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struct btrfs_bio *bbio = btrfs_bio(bio);
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struct btrfs_fs_info *fs_info = bbio->inode->root->fs_info;
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struct btrfs_inode *inode = bbio->inode;
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struct btrfs_fs_info *fs_info = inode->root->fs_info;
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struct btrfs_bio *orig_bbio = bbio;
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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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bool use_append = btrfs_use_zone_append(inode, logical);
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struct btrfs_io_context *bioc = NULL;
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struct btrfs_io_stripe smap;
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blk_status_t ret;
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@ -622,8 +627,11 @@ static bool btrfs_submit_chunk(struct bio *bio, int mirror_num)
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}
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map_length = min(map_length, length);
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if (use_append)
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map_length = min(map_length, fs_info->max_zone_append_size);
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if (map_length < length) {
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bio = btrfs_split_bio(bio, map_length);
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bio = btrfs_split_bio(fs_info, bio, map_length, use_append);
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bbio = btrfs_bio(bio);
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}
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@ -639,7 +647,9 @@ static bool btrfs_submit_chunk(struct bio *bio, int mirror_num)
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}
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if (btrfs_op(bio) == BTRFS_MAP_WRITE) {
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if (bio_op(bio) == REQ_OP_ZONE_APPEND) {
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if (use_append) {
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bio->bi_opf &= ~REQ_OP_WRITE;
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bio->bi_opf |= REQ_OP_ZONE_APPEND;
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ret = btrfs_extract_ordered_extent(btrfs_bio(bio));
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if (ret)
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goto fail_put_bio;
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@ -649,9 +659,9 @@ static bool btrfs_submit_chunk(struct bio *bio, int mirror_num)
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* Csum items for reloc roots have already been cloned at this
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* point, so they are handled as part of the no-checksum case.
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*/
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if (!(bbio->inode->flags & BTRFS_INODE_NODATASUM) &&
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if (!(inode->flags & BTRFS_INODE_NODATASUM) &&
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!test_bit(BTRFS_FS_STATE_NO_CSUMS, &fs_info->fs_state) &&
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!btrfs_is_data_reloc_root(bbio->inode->root)) {
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!btrfs_is_data_reloc_root(inode->root)) {
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if (should_async_write(bbio) &&
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btrfs_wq_submit_bio(bbio, bioc, &smap, mirror_num))
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goto done;
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@ -258,57 +258,14 @@ static void btrfs_finish_compressed_write_work(struct work_struct *work)
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static void end_compressed_bio_write(struct btrfs_bio *bbio)
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{
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struct compressed_bio *cb = bbio->private;
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struct btrfs_fs_info *fs_info = btrfs_sb(cb->inode->i_sb);
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if (bbio->bio.bi_status)
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cb->status = bbio->bio.bi_status;
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cb->status = bbio->bio.bi_status;
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queue_work(fs_info->compressed_write_workers, &cb->write_end_work);
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if (refcount_dec_and_test(&cb->pending_ios)) {
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struct btrfs_fs_info *fs_info = btrfs_sb(cb->inode->i_sb);
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queue_work(fs_info->compressed_write_workers, &cb->write_end_work);
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}
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bio_put(&bbio->bio);
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}
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/*
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* Allocate a compressed_bio, which will be used to read/write on-disk
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* (aka, compressed) * data.
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*
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* @cb: The compressed_bio structure, which records all the needed
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* information to bind the compressed data to the uncompressed
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* page cache.
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* @disk_byten: The logical bytenr where the compressed data will be read
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* from or written to.
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* @endio_func: The endio function to call after the IO for compressed data
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* is finished.
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*/
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static struct bio *alloc_compressed_bio(struct compressed_bio *cb, u64 disk_bytenr,
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blk_opf_t opf,
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btrfs_bio_end_io_t endio_func)
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{
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struct bio *bio;
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bio = btrfs_bio_alloc(BIO_MAX_VECS, opf, BTRFS_I(cb->inode), endio_func,
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cb);
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bio->bi_iter.bi_sector = disk_bytenr >> SECTOR_SHIFT;
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if (bio_op(bio) == REQ_OP_ZONE_APPEND) {
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struct btrfs_fs_info *fs_info = btrfs_sb(cb->inode->i_sb);
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struct btrfs_device *device;
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device = btrfs_zoned_get_device(fs_info, disk_bytenr,
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fs_info->sectorsize);
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if (IS_ERR(device)) {
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bio_put(bio);
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return ERR_CAST(device);
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}
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bio_set_dev(bio, device->bdev);
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}
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refcount_inc(&cb->pending_ios);
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return bio;
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}
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/*
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* worker function to build and submit bios for previously compressed pages.
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* The corresponding pages in the inode should be marked for writeback
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@ -332,16 +289,12 @@ blk_status_t btrfs_submit_compressed_write(struct btrfs_inode *inode, u64 start,
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struct compressed_bio *cb;
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u64 cur_disk_bytenr = disk_start;
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blk_status_t ret = BLK_STS_OK;
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const bool use_append = btrfs_use_zone_append(inode, disk_start);
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const enum req_op bio_op = REQ_BTRFS_ONE_ORDERED |
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(use_append ? REQ_OP_ZONE_APPEND : REQ_OP_WRITE);
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ASSERT(IS_ALIGNED(start, fs_info->sectorsize) &&
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IS_ALIGNED(len, fs_info->sectorsize));
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cb = kmalloc(sizeof(struct compressed_bio), GFP_NOFS);
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if (!cb)
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return BLK_STS_RESOURCE;
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refcount_set(&cb->pending_ios, 1);
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cb->status = BLK_STS_OK;
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cb->inode = &inode->vfs_inode;
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cb->start = start;
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@ -352,8 +305,16 @@ blk_status_t btrfs_submit_compressed_write(struct btrfs_inode *inode, u64 start,
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INIT_WORK(&cb->write_end_work, btrfs_finish_compressed_write_work);
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cb->nr_pages = nr_pages;
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if (blkcg_css)
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if (blkcg_css) {
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kthread_associate_blkcg(blkcg_css);
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write_flags |= REQ_CGROUP_PUNT;
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}
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write_flags |= REQ_BTRFS_ONE_ORDERED;
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bio = btrfs_bio_alloc(BIO_MAX_VECS, REQ_OP_WRITE | write_flags,
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BTRFS_I(cb->inode), end_compressed_bio_write, cb);
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bio->bi_iter.bi_sector = cur_disk_bytenr >> SECTOR_SHIFT;
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btrfs_bio(bio)->file_offset = start;
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while (cur_disk_bytenr < disk_start + compressed_len) {
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u64 offset = cur_disk_bytenr - disk_start;
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@ -361,20 +322,7 @@ blk_status_t btrfs_submit_compressed_write(struct btrfs_inode *inode, u64 start,
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unsigned int real_size;
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unsigned int added;
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struct page *page = compressed_pages[index];
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bool submit = false;
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/* Allocate new bio if submitted or not yet allocated */
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if (!bio) {
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bio = alloc_compressed_bio(cb, cur_disk_bytenr,
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bio_op | write_flags, end_compressed_bio_write);
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if (IS_ERR(bio)) {
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ret = errno_to_blk_status(PTR_ERR(bio));
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break;
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}
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btrfs_bio(bio)->file_offset = start;
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if (blkcg_css)
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bio->bi_opf |= REQ_CGROUP_PUNT;
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}
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/*
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* We have various limits on the real read size:
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* - page boundary
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@ -384,35 +332,20 @@ blk_status_t btrfs_submit_compressed_write(struct btrfs_inode *inode, u64 start,
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real_size = min_t(u64, real_size, compressed_len - offset);
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ASSERT(IS_ALIGNED(real_size, fs_info->sectorsize));
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if (use_append)
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added = bio_add_zone_append_page(bio, page, real_size,
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offset_in_page(offset));
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else
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added = bio_add_page(bio, page, real_size,
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offset_in_page(offset));
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/* Reached zoned boundary */
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if (added == 0)
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submit = true;
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added = bio_add_page(bio, page, real_size, offset_in_page(offset));
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/*
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* Maximum compressed extent is smaller than bio size limit,
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* thus bio_add_page() should always success.
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*/
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ASSERT(added == real_size);
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cur_disk_bytenr += added;
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/* Finished the range */
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if (cur_disk_bytenr == disk_start + compressed_len)
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submit = true;
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if (submit) {
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ASSERT(bio->bi_iter.bi_size);
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btrfs_submit_bio(bio, 0);
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bio = NULL;
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}
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cond_resched();
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}
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/* Finished the range. */
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ASSERT(bio->bi_iter.bi_size);
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btrfs_submit_bio(bio, 0);
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if (blkcg_css)
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kthread_associate_blkcg(NULL);
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if (refcount_dec_and_test(&cb->pending_ios))
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finish_compressed_bio_write(cb);
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return ret;
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}
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@ -624,7 +557,6 @@ void btrfs_submit_compressed_read(struct inode *inode, struct bio *bio,
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goto out;
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}
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refcount_set(&cb->pending_ios, 1);
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cb->status = BLK_STS_OK;
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cb->inode = inode;
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@ -31,9 +31,6 @@ static_assert((BTRFS_MAX_COMPRESSED % PAGE_SIZE) == 0);
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#define BTRFS_ZLIB_DEFAULT_LEVEL 3
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struct compressed_bio {
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/* Number of outstanding bios */
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refcount_t pending_ios;
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/* Number of compressed pages in the array */
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unsigned int nr_pages;
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@ -896,7 +896,6 @@ static int btrfs_bio_add_page(struct btrfs_bio_ctrl *bio_ctrl,
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u32 real_size;
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const sector_t sector = disk_bytenr >> SECTOR_SHIFT;
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bool contig = false;
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int ret;
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ASSERT(bio);
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/* The limit should be calculated when bio_ctrl->bio is allocated */
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@ -945,12 +944,7 @@ static int btrfs_bio_add_page(struct btrfs_bio_ctrl *bio_ctrl,
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if (real_size == 0)
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return 0;
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if (bio_op(bio) == REQ_OP_ZONE_APPEND)
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ret = bio_add_zone_append_page(bio, page, real_size, pg_offset);
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else
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ret = bio_add_page(bio, page, real_size, pg_offset);
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return ret;
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return bio_add_page(bio, page, real_size, pg_offset);
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}
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static void calc_bio_boundaries(struct btrfs_bio_ctrl *bio_ctrl,
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@ -965,7 +959,7 @@ static void calc_bio_boundaries(struct btrfs_bio_ctrl *bio_ctrl,
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* them.
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*/
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if (bio_ctrl->compress_type == BTRFS_COMPRESS_NONE &&
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bio_op(bio_ctrl->bio) == REQ_OP_ZONE_APPEND) {
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btrfs_use_zone_append(inode, logical)) {
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ordered = btrfs_lookup_ordered_extent(inode, file_offset);
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if (ordered) {
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bio_ctrl->len_to_oe_boundary = min_t(u32, U32_MAX,
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@ -979,16 +973,14 @@ static void calc_bio_boundaries(struct btrfs_bio_ctrl *bio_ctrl,
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bio_ctrl->len_to_oe_boundary = U32_MAX;
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}
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static int alloc_new_bio(struct btrfs_inode *inode,
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struct btrfs_bio_ctrl *bio_ctrl,
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struct writeback_control *wbc,
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blk_opf_t opf,
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u64 disk_bytenr, u32 offset, u64 file_offset,
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enum btrfs_compression_type compress_type)
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static void alloc_new_bio(struct btrfs_inode *inode,
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struct btrfs_bio_ctrl *bio_ctrl,
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struct writeback_control *wbc, blk_opf_t opf,
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u64 disk_bytenr, u32 offset, u64 file_offset,
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enum btrfs_compression_type compress_type)
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{
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struct btrfs_fs_info *fs_info = inode->root->fs_info;
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struct bio *bio;
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int ret;
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bio = btrfs_bio_alloc(BIO_MAX_VECS, opf, inode, bio_ctrl->end_io_func,
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NULL);
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@ -1006,40 +998,14 @@ static int alloc_new_bio(struct btrfs_inode *inode,
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if (wbc) {
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/*
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* For Zone append we need the correct block_device that we are
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* going to write to set in the bio to be able to respect the
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* hardware limitation. Look it up here:
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* Pick the last added device to support cgroup writeback. For
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* multi-device file systems this means blk-cgroup policies have
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* to always be set on the last added/replaced device.
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* This is a bit odd but has been like that for a long time.
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*/
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if (bio_op(bio) == REQ_OP_ZONE_APPEND) {
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struct btrfs_device *dev;
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dev = btrfs_zoned_get_device(fs_info, disk_bytenr,
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fs_info->sectorsize);
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if (IS_ERR(dev)) {
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ret = PTR_ERR(dev);
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goto error;
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}
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bio_set_dev(bio, dev->bdev);
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} else {
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/*
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* Otherwise pick the last added device to support
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* cgroup writeback. For multi-device file systems this
|
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* means blk-cgroup policies have to always be set on the
|
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* last added/replaced device. This is a bit odd but has
|
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* been like that for a long time.
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*/
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bio_set_dev(bio, fs_info->fs_devices->latest_dev->bdev);
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}
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bio_set_dev(bio, fs_info->fs_devices->latest_dev->bdev);
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wbc_init_bio(wbc, bio);
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} else {
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ASSERT(bio_op(bio) != REQ_OP_ZONE_APPEND);
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}
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return 0;
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error:
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bio_ctrl->bio = NULL;
|
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btrfs_bio_end_io(btrfs_bio(bio), errno_to_blk_status(ret));
|
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return ret;
|
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}
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/*
|
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|
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@ -1065,7 +1031,6 @@ static int submit_extent_page(blk_opf_t opf,
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enum btrfs_compression_type compress_type,
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bool force_bio_submit)
|
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{
|
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int ret = 0;
|
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struct btrfs_inode *inode = BTRFS_I(page->mapping->host);
|
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unsigned int cur = pg_offset;
|
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|
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|
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@ -1085,12 +1050,9 @@ static int submit_extent_page(blk_opf_t opf,
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|
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/* 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;
|
||||
|
||||
|
|
|
|||
|
|
@ -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;
|
||||
|
|
|
|||
|
|
@ -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
|
||||
*
|
||||
|
|
|
|||
|
|
@ -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;
|
||||
|
|
|
|||
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