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Btrfs: Lookup readpage checksums on bio submission again

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This optimization had been removed because I thought it was triggering
csum errors.  The real cause of the errors was elsewhere, and so
this optimization is back.

Signed-off-by: Chris Mason <chris.mason@oracle.com>
This commit is contained in:
Chris Mason 2008-08-20 09:44:52 -04:00
parent 7c2fe32a23
commit 4d1b5fb4d7
2 changed files with 6 additions and 60 deletions
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4
fs/btrfs/file-item.c
View File

@ -134,7 +134,6 @@ int btrfs_lookup_file_extent(struct btrfs_trans_handle *trans,
return ret;
}
#if 0 /* broken */
int btrfs_lookup_bio_sums(struct btrfs_root *root, struct inode *inode,
struct bio *bio)
{
@ -151,6 +150,8 @@ int btrfs_lookup_bio_sums(struct btrfs_root *root, struct inode *inode,
struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree;
path = btrfs_alloc_path();
if (bio->bi_size > PAGE_CACHE_SIZE * 8)
path->reada = 2;
WARN_ON(bio->bi_vcnt <= 0);
@ -211,7 +212,6 @@ int btrfs_lookup_bio_sums(struct btrfs_root *root, struct inode *inode,
btrfs_free_path(path);
return 0;
}
#endif
int btrfs_csum_one_bio(struct btrfs_root *root, struct inode *inode,
struct bio *bio)

62
fs/btrfs/inode.c
View File

@ -389,15 +389,15 @@ int btrfs_submit_bio_hook(struct inode *inode, int rw, struct bio *bio,
ret = btrfs_bio_wq_end_io(root->fs_info, bio, 0);
BUG_ON(ret);
if (!(rw & (1 << BIO_RW))) {
goto mapit;
}
if (btrfs_test_opt(root, NODATASUM) ||
btrfs_test_flag(inode, NODATASUM)) {
goto mapit;
}
if (!(rw & (1 << BIO_RW))) {
btrfs_lookup_bio_sums(root, inode, bio);
goto mapit;
}
return btrfs_wq_submit_bio(BTRFS_I(inode)->root->fs_info,
inode, rw, bio, mirror_num,
__btrfs_submit_bio_hook);
@ -603,59 +603,6 @@ int btrfs_writepage_end_io_hook(struct page *page, u64 start, u64 end,
return btrfs_finish_ordered_io(page->mapping->host, start, end);
}
int btrfs_readpage_io_hook(struct page *page, u64 start, u64 end)
{
int ret = 0;
struct inode *inode = page->mapping->host;
struct btrfs_root *root = BTRFS_I(inode)->root;
struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree;
struct btrfs_csum_item *item;
struct btrfs_path *path = NULL;
u32 csum;
if (btrfs_test_opt(root, NODATASUM) ||
btrfs_test_flag(inode, NODATASUM))
return 0;
/*
* It is possible there is an ordered extent that has
* not yet finished for this range in the file. If so,
* that extent will have a csum cached, and it will insert
* the sum after all the blocks in the extent are fully
* on disk. So, look for an ordered extent and use the
* sum if found. We have to do this before looking in the
* btree because csum items are pre-inserted based on
* the file size. btrfs_lookup_csum might find an item
* that still hasn't been fully filled.
*/
ret = btrfs_find_ordered_sum(inode, start, &csum);
if (ret == 0)
goto found;
ret = 0;
path = btrfs_alloc_path();
item = btrfs_lookup_csum(NULL, root, path, inode->i_ino, start, 0);
if (IS_ERR(item)) {
ret = PTR_ERR(item);
/* a csum that isn't present is a preallocated region. */
if (ret == -ENOENT || ret == -EFBIG)
ret = 0;
csum = 0;
if (printk_ratelimit())
printk("no csum found for inode %lu start %Lu\n", inode->i_ino,
start);
goto out;
}
read_extent_buffer(path->nodes[0], &csum, (unsigned long)item,
BTRFS_CRC32_SIZE);
found:
set_state_private(io_tree, start, csum);
out:
if (path)
btrfs_free_path(path);
return ret;
}
struct io_failure_record {
struct page *page;
u64 start;
@ -3669,7 +3616,6 @@ static struct extent_io_ops btrfs_extent_io_ops = {
.fill_delalloc = run_delalloc_range,
.submit_bio_hook = btrfs_submit_bio_hook,
.merge_bio_hook = btrfs_merge_bio_hook,
.readpage_io_hook = btrfs_readpage_io_hook,
.readpage_end_io_hook = btrfs_readpage_end_io_hook,
.writepage_end_io_hook = btrfs_writepage_end_io_hook,
.writepage_start_hook = btrfs_writepage_start_hook,