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nilfs2: Convert to XArray

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This is close to a 1:1 replacement of radix tree APIs with their XArray
equivalents.  It would be possible to optimise nilfs_copy_back_pages(),
but that doesn't seem to be in the performance path.  Also, I think
it has a pre-existing bug, and I've added a note to that effect in the
source code.

Signed-off-by: Matthew Wilcox <willy@infradead.org>
This commit is contained in:
Matthew Wilcox
2017-12-04 19:33:30 -05:00
rodzic 04edf02cdd
commit f611ff6375
2 zmienionych plików z 22 dodań i 33 usunięć
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29
fs/nilfs2/page.c
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@@ -289,7 +289,7 @@ repeat:
* @dmap: destination page cache
* @smap: source page cache
*
* No pages must no be added to the cache during this process.
* No pages must be added to the cache during this process.
* This must be ensured by the caller.
*/
void nilfs_copy_back_pages(struct address_space *dmap,
@@ -298,7 +298,6 @@ void nilfs_copy_back_pages(struct address_space *dmap,
struct pagevec pvec;
unsigned int i, n;
pgoff_t index = 0;
int err;
pagevec_init(&pvec);
repeat:
@@ -313,35 +312,34 @@ repeat:
lock_page(page);
dpage = find_lock_page(dmap, offset);
if (dpage) {
/* override existing page on the destination cache */
/* overwrite existing page in the destination cache */
WARN_ON(PageDirty(dpage));
nilfs_copy_page(dpage, page, 0);
unlock_page(dpage);
put_page(dpage);
/* Do we not need to remove page from smap here? */
} else {
struct page *page2;
struct page *p;
/* move the page to the destination cache */
xa_lock_irq(&smap->i_pages);
page2 = radix_tree_delete(&smap->i_pages, offset);
WARN_ON(page2 != page);
p = __xa_erase(&smap->i_pages, offset);
WARN_ON(page != p);
smap->nrpages--;
xa_unlock_irq(&smap->i_pages);
xa_lock_irq(&dmap->i_pages);
err = radix_tree_insert(&dmap->i_pages, offset, page);
if (unlikely(err < 0)) {
WARN_ON(err == -EEXIST);
p = __xa_store(&dmap->i_pages, offset, page, GFP_NOFS);
if (unlikely(p)) {
/* Probably -ENOMEM */
page->mapping = NULL;
put_page(page); /* for cache */
put_page(page);
} else {
page->mapping = dmap;
dmap->nrpages++;
if (PageDirty(page))
radix_tree_tag_set(&dmap->i_pages,
offset,
PAGECACHE_TAG_DIRTY);
__xa_set_mark(&dmap->i_pages, offset,
PAGECACHE_TAG_DIRTY);
}
xa_unlock_irq(&dmap->i_pages);
}
@@ -467,8 +465,7 @@ int __nilfs_clear_page_dirty(struct page *page)
if (mapping) {
xa_lock_irq(&mapping->i_pages);
if (test_bit(PG_dirty, &page->flags)) {
radix_tree_tag_clear(&mapping->i_pages,
page_index(page),
__xa_clear_mark(&mapping->i_pages, page_index(page),
PAGECACHE_TAG_DIRTY);
xa_unlock_irq(&mapping->i_pages);
return clear_page_dirty_for_io(page);