Btrfs: Handle data block end_io through the async work queue
Before it was done by the bio end_io routine, the work queue code is able to scale much better with faster IO subsystems. Signed-off-by: Chris Mason <chris.mason@oracle.com>
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@ -54,6 +54,7 @@ struct end_io_wq {
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void *private;
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struct btrfs_fs_info *info;
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int error;
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int metadata;
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struct list_head list;
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};
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@ -308,29 +309,40 @@ static int end_workqueue_bio(struct bio *bio,
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#endif
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}
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static int btree_submit_bio_hook(struct inode *inode, int rw, struct bio *bio)
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int btrfs_bio_wq_end_io(struct btrfs_fs_info *info, struct bio *bio,
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int metadata)
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{
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struct btrfs_root *root = BTRFS_I(inode)->root;
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struct end_io_wq *end_io_wq;
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u64 offset;
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offset = bio->bi_sector << 9;
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if (rw & (1 << BIO_RW)) {
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return btrfs_map_bio(BTRFS_I(inode)->root, rw, bio);
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}
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end_io_wq = kmalloc(sizeof(*end_io_wq), GFP_NOFS);
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if (!end_io_wq)
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return -ENOMEM;
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end_io_wq->private = bio->bi_private;
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end_io_wq->end_io = bio->bi_end_io;
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end_io_wq->info = root->fs_info;
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end_io_wq->info = info;
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end_io_wq->error = 0;
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end_io_wq->bio = bio;
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end_io_wq->metadata = metadata;
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bio->bi_private = end_io_wq;
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bio->bi_end_io = end_workqueue_bio;
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return 0;
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}
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static int btree_submit_bio_hook(struct inode *inode, int rw, struct bio *bio)
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{
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struct btrfs_root *root = BTRFS_I(inode)->root;
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u64 offset;
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int ret;
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offset = bio->bi_sector << 9;
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if (rw & (1 << BIO_RW)) {
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return btrfs_map_bio(BTRFS_I(inode)->root, rw, bio);
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}
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ret = btrfs_bio_wq_end_io(root->fs_info, bio, 1);
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BUG_ON(ret);
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if (offset == BTRFS_SUPER_INFO_OFFSET) {
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bio->bi_bdev = root->fs_info->sb->s_bdev;
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@ -880,7 +892,7 @@ void btrfs_end_io_csum(struct work_struct *work)
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end_io_wq = list_entry(next, struct end_io_wq, list);
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bio = end_io_wq->bio;
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if (!bio_ready_for_csum(bio)) {
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if (end_io_wq->metadata && !bio_ready_for_csum(bio)) {
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spin_lock_irqsave(&fs_info->end_io_work_lock, flags);
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was_empty = list_empty(&fs_info->end_io_work_list);
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list_add_tail(&end_io_wq->list,
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@ -71,4 +71,6 @@ void btrfs_throttle(struct btrfs_root *root);
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int btrfs_open_device(struct btrfs_device *dev);
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int btrfs_verify_block_csum(struct btrfs_root *root,
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struct extent_buffer *buf);
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int btrfs_bio_wq_end_io(struct btrfs_fs_info *info, struct bio *bio,
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int metadata);
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#endif
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@ -328,7 +328,9 @@ int btrfs_submit_bio_hook(struct inode *inode, int rw, struct bio *bio)
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struct btrfs_trans_handle *trans;
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int ret = 0;
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if (rw != WRITE) {
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if (!(rw & (1 << BIO_RW))) {
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ret = btrfs_bio_wq_end_io(root->fs_info, bio, 0);
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BUG_ON(ret);
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goto mapit;
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}
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