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Btrfs: Write bio checksumming outside the FS mutex

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This significantly improves streaming write performance by allowing
concurrency in the data checksumming.

Signed-off-by: Chris Mason <chris.mason@oracle.com>
This commit is contained in:
Chris Mason
2008-04-16 11:15:20 -04:00
parent 44b8bd7edd
commit e015640f9c
3 changed files with 45 additions and 16 deletions
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11
fs/btrfs/inode.c
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@@ -330,14 +330,23 @@ int __btrfs_submit_bio_hook(struct inode *inode, int rw, struct bio *bio,
struct btrfs_root *root = BTRFS_I(inode)->root;
struct btrfs_trans_handle *trans;
int ret = 0;
char *sums = NULL;
ret = btrfs_csum_one_bio(root, bio, &sums);
BUG_ON(ret);
mutex_lock(&root->fs_info->fs_mutex);
trans = btrfs_start_transaction(root, 1);
btrfs_set_trans_block_group(trans, inode);
btrfs_csum_file_blocks(trans, root, inode, bio);
btrfs_csum_file_blocks(trans, root, inode, bio, sums);
ret = btrfs_end_transaction(trans, root);
BUG_ON(ret);
mutex_unlock(&root->fs_info->fs_mutex);
kfree(sums);
return btrfs_map_bio(root, rw, bio, mirror_num);
}