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Btrfs: cleanup destroy_marked_extents 

We can just look up the extent_buffers for the range and free stuff that way.
This makes the cleanup a bit cleaner and we can make sure to evict the
extent_buffers pretty quickly by marking them as stale.  Thanks,

Signed-off-by: Josef Bacik <jbacik@fusionio.com>
This commit is contained in:
Josef Bacik 2013-04-24 16:41:19 -04:00
parent abefa55ac1
commit fd8b2b6115
3 changed files with 11 additions and 32 deletions
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40
fs/btrfs/disk-io.c
View File

@ -3752,13 +3752,9 @@ static int btrfs_destroy_marked_extents(struct btrfs_root *root,
int mark)
{
int ret;
struct page *page;
struct inode *btree_inode = root->fs_info->btree_inode;
struct extent_buffer *eb;
u64 start = 0;
u64 end;
u64 offset;
unsigned long index;
while (1) {
ret = find_first_extent_bit(dirty_pages, start, &start, &end,
@ -3768,35 +3764,17 @@ static int btrfs_destroy_marked_extents(struct btrfs_root *root,
clear_extent_bits(dirty_pages, start, end, mark, GFP_NOFS);
while (start <= end) {
index = start >> PAGE_CACHE_SHIFT;
start = (u64)(index + 1) << PAGE_CACHE_SHIFT;
page = find_get_page(btree_inode->i_mapping, index);
if (!page)
eb = btrfs_find_tree_block(root, start,
root->leafsize);
start += eb->len;
if (!eb)
continue;
offset = page_offset(page);
wait_on_extent_buffer_writeback(eb);
spin_lock(&dirty_pages->buffer_lock);
eb = radix_tree_lookup(
&(&BTRFS_I(page->mapping->host)->io_tree)->buffer,
offset >> PAGE_CACHE_SHIFT);
spin_unlock(&dirty_pages->buffer_lock);
if (eb)
ret = test_and_clear_bit(EXTENT_BUFFER_DIRTY,
&eb->bflags);
lock_page(page);
wait_on_page_writeback(page);
if (PageDirty(page)) {
clear_page_dirty_for_io(page);
spin_lock_irq(&page->mapping->tree_lock);
radix_tree_tag_clear(&page->mapping->page_tree,
page_index(page),
PAGECACHE_TAG_DIRTY);
spin_unlock_irq(&page->mapping->tree_lock);
}
unlock_page(page);
page_cache_release(page);
if (test_and_clear_bit(EXTENT_BUFFER_DIRTY,
&eb->bflags))
clear_extent_buffer_dirty(eb);
free_extent_buffer_stale(eb);
}
}

2
fs/btrfs/extent_io.c
View File

@ -3162,7 +3162,7 @@ static int eb_wait(void *word)
return 0;
}
static void wait_on_extent_buffer_writeback(struct extent_buffer *eb)
void wait_on_extent_buffer_writeback(struct extent_buffer *eb)
{
wait_on_bit(&eb->bflags, EXTENT_BUFFER_WRITEBACK, eb_wait,
TASK_UNINTERRUPTIBLE);

1
fs/btrfs/extent_io.h
View File

@ -282,6 +282,7 @@ void free_extent_buffer_stale(struct extent_buffer *eb);
int read_extent_buffer_pages(struct extent_io_tree *tree,
struct extent_buffer *eb, u64 start, int wait,
get_extent_t *get_extent, int mirror_num);
void wait_on_extent_buffer_writeback(struct extent_buffer *eb);
static inline unsigned long num_extent_pages(u64 start, u64 len)
{