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Btrfs: introduce free_extent_buffer_stale

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Because btrfs cow's we can end up with extent buffers that are no longer
necessary just sitting around in memory.  So instead of evicting these pages, we
could end up evicting things we actually care about.  Thus we have
free_extent_buffer_stale for use when we are freeing tree blocks.  This will
make it so that the ref for the eb being in the radix tree is dropped as soon as
possible and then is freed when the refcount hits 0 instead of waiting to be
released by releasepage.  Thanks,

Signed-off-by: Josef Bacik <josef@redhat.com>
This commit is contained in:
Josef Bacik 2012-03-09 16:01:49 -05:00 • committed by Chris Mason
parent 115391d231
commit 3083ee2e18
5 changed files with 205 additions and 64 deletions
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14
fs/btrfs/disk-io.c
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@ -923,16 +923,8 @@ static int btree_readpage(struct file *file, struct page *page)
static int btree_releasepage(struct page *page, gfp_t gfp_flags)
{
struct extent_map_tree *map;
struct extent_io_tree *tree;
int ret;
if (PageWriteback(page) || PageDirty(page))
return 0;
tree = &BTRFS_I(page->mapping->host)->io_tree;
map = &BTRFS_I(page->mapping->host)->extent_tree;
/*
* We need to mask out eg. __GFP_HIGHMEM and __GFP_DMA32 as we're doing
* slab allocation from alloc_extent_state down the callchain where
@ -940,11 +932,7 @@ static int btree_releasepage(struct page *page, gfp_t gfp_flags)
*/
gfp_flags &= ~GFP_SLAB_BUG_MASK;
ret = try_release_extent_state(map, tree, page, gfp_flags);
if (!ret)
return 0;
return try_release_extent_buffer(tree, page);
return try_release_extent_buffer(page, gfp_flags);
}
static void btree_invalidatepage(struct page *page, unsigned long offset)