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Btrfs: remove unused write cache pages hook 

The btree inode has it's own write cache pages so we can remove this write
cache pages hook as it's not used.  Thanks,

Signed-off-by: Josef Bacik <jbacik@fusionio.com>
This commit is contained in:
Josef Bacik 2012-09-14 13:51:53 -04:00 committed by Chris Mason
parent b5bae2612a
commit 892951a92e
1 changed files with 0 additions and 47 deletions
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47
fs/btrfs/disk-io.c
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@ -3347,52 +3347,6 @@ int btrfs_read_buffer(struct extent_buffer *buf, u64 parent_transid)
return btree_read_extent_buffer_pages(root, buf, 0, parent_transid);
}
int btree_lock_page_hook(struct page *page, void *data,
void (*flush_fn)(void *))
{
struct inode *inode = page->mapping->host;
struct btrfs_root *root = BTRFS_I(inode)->root;
struct extent_buffer *eb;
/*
* We culled this eb but the page is still hanging out on the mapping,
* carry on.
*/
if (!PagePrivate(page))
goto out;
eb = (struct extent_buffer *)page->private;
if (!eb) {
WARN_ON(1);
goto out;
}
if (page != eb->pages[0])
goto out;
if (!btrfs_try_tree_write_lock(eb)) {
flush_fn(data);
btrfs_tree_lock(eb);
}
btrfs_set_header_flag(eb, BTRFS_HEADER_FLAG_WRITTEN);
if (test_and_clear_bit(EXTENT_BUFFER_DIRTY, &eb->bflags)) {
spin_lock(&root->fs_info->delalloc_lock);
if (root->fs_info->dirty_metadata_bytes >= eb->len)
root->fs_info->dirty_metadata_bytes -= eb->len;
else
WARN_ON(1);
spin_unlock(&root->fs_info->delalloc_lock);
}
btrfs_tree_unlock(eb);
out:
if (!trylock_page(page)) {
flush_fn(data);
lock_page(page);
}
return 0;
}
static int btrfs_check_super_valid(struct btrfs_fs_info *fs_info,
int read_only)
{
@ -3787,7 +3741,6 @@ int btrfs_cleanup_transaction(struct btrfs_root *root)
}
static struct extent_io_ops btree_extent_io_ops = {
.write_cache_pages_lock_hook = btree_lock_page_hook,
.readpage_end_io_hook = btree_readpage_end_io_hook,
.readpage_io_failed_hook = btree_io_failed_hook,
.submit_bio_hook = btree_submit_bio_hook,