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Btrfs: Checksum tree blocks in the background

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Tree blocks were using async bio submission, but the sum was still
being done directly during writepage.  This moves the checksumming
into the worker thread.

Signed-off-by: Chris Mason <chris.mason@oracle.com>
This commit is contained in:
Chris Mason 2008-09-23 13:14:12 -04:00
parent 0f9dd46cda
commit ce3ed71a58
1 changed files with 17 additions and 9 deletions
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26
fs/btrfs/disk-io.c
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@ -315,14 +315,6 @@ int csum_dirty_buffer(struct btrfs_root *root, struct page *page)
return 0;
}
static int btree_writepage_io_hook(struct page *page, u64 start, u64 end)
{
struct btrfs_root *root = BTRFS_I(page->mapping->host)->root;
csum_dirty_buffer(root, page);
return 0;
}
int btree_readpage_end_io_hook(struct page *page, u64 start, u64 end,
struct extent_state *state)
{
@ -501,6 +493,22 @@ int btrfs_wq_submit_bio(struct btrfs_fs_info *fs_info, struct inode *inode,
return 0;
}
static int btree_csum_one_bio(struct bio *bio)
{
struct bio_vec *bvec = bio->bi_io_vec;
int bio_index = 0;
struct btrfs_root *root;
WARN_ON(bio->bi_vcnt <= 0);
while(bio_index < bio->bi_vcnt) {
root = BTRFS_I(bvec->bv_page->mapping->host)->root;
csum_dirty_buffer(root, bvec->bv_page);
bio_index++;
bvec++;
}
return 0;
}
static int __btree_submit_bio_hook(struct inode *inode, int rw, struct bio *bio,
int mirror_num)
{
@ -515,6 +523,7 @@ static int __btree_submit_bio_hook(struct inode *inode, int rw, struct bio *bio,
* submission context. Just jump into btrfs_map_bio
*/
if (rw & (1 << BIO_RW)) {
btree_csum_one_bio(bio);
return btrfs_map_bio(BTRFS_I(inode)->root, rw, bio,
mirror_num, 1);
}
@ -2040,7 +2049,6 @@ int btree_lock_page_hook(struct page *page)
static struct extent_io_ops btree_extent_io_ops = {
.write_cache_pages_lock_hook = btree_lock_page_hook,
.writepage_io_hook = btree_writepage_io_hook,
.readpage_end_io_hook = btree_readpage_end_io_hook,
.submit_bio_hook = btree_submit_bio_hook,
/* note we're sharing with inode.c for the merge bio hook */