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authorMatthew Wilcox <willy@infradead.org>2017-12-04 19:33:30 -0500
committerMatthew Wilcox <willy@infradead.org>2018-10-21 10:46:42 -0400
commitf611ff63751afa421edc1eddf4281de13e082c51 (patch)
tree315343a694b2b3dd03d0a17cfcbbc649243f9e10 /fs/nilfs2/page.c
parent04edf02cdd37a7e2e23ce8de77cb06d22ef2f503 (diff)
nilfs2: Convert to XArray
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>
Diffstat (limited to 'fs/nilfs2/page.c')
-rw-r--r--fs/nilfs2/page.c29
1 files changed, 13 insertions, 16 deletions
diff --git a/fs/nilfs2/page.c b/fs/nilfs2/page.c
index 329a056b73b1..d7fc8d369d89 100644
--- a/fs/nilfs2/page.c
+++ b/fs/nilfs2/page.c
@@ -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);