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Btrfs: Don't drop extent_map cache during releasepage on the btree inode

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The btree inode should only have a single extent_map in the cache,
it doesn't make sense to ever drop it.

Signed-off-by: Chris Mason <chris.mason@oracle.com>
This commit is contained in:
Chris Mason
2008-04-18 10:29:50 -04:00
parent 7ae9c09d8f
commit 7b13b7b119
3 changed files with 44 additions and 20 deletions
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23
fs/btrfs/disk-io.c
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@@ -76,13 +76,12 @@ struct extent_map *btree_get_extent(struct inode *inode, struct page *page,
struct extent_map *em;
int ret;
again:
spin_lock(&em_tree->lock);
em = lookup_extent_mapping(em_tree, start, len);
spin_unlock(&em_tree->lock);
if (em) {
if (em)
goto out;
}
em = alloc_extent_map(GFP_NOFS);
if (!em) {
em = ERR_PTR(-ENOMEM);
@@ -95,15 +94,21 @@ again:
spin_lock(&em_tree->lock);
ret = add_extent_mapping(em_tree, em);
spin_unlock(&em_tree->lock);
if (ret == -EEXIST) {
free_extent_map(em);
em = NULL;
goto again;
em = lookup_extent_mapping(em_tree, start, len);
if (em)
ret = 0;
else
ret = -EIO;
} else if (ret) {
em = ERR_PTR(ret);
free_extent_map(em);
em = NULL;
}
spin_unlock(&em_tree->lock);
if (ret)
em = ERR_PTR(ret);
out:
return em;
}
@@ -496,7 +501,7 @@ static int btree_releasepage(struct page *page, gfp_t gfp_flags)
}
tree = &BTRFS_I(page->mapping->host)->io_tree;
map = &BTRFS_I(page->mapping->host)->extent_tree;
ret = try_release_extent_mapping(map, tree, page, gfp_flags);
ret = try_release_extent_state(map, tree, page, gfp_flags);
if (ret == 1) {
invalidate_extent_lru(tree, page_offset(page), PAGE_CACHE_SIZE);
ClearPagePrivate(page);