leandrof/linux
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity

dax: Convert __dax_invalidate_entry to XArray

Browse Source 
Avoids walking the radix tree multiple times looking for tags.

Signed-off-by: Matthew Wilcox <willy@infradead.org>
This commit is contained in:
Matthew Wilcox 2018-03-28 15:40:41 -04:00
parent 084a899008
commit 07f2d89cc2
1 changed files with 9 additions and 8 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

17
fs/dax.c
View File

@ -777,27 +777,28 @@ EXPORT_SYMBOL_GPL(dax_layout_busy_page);
static int __dax_invalidate_entry(struct address_space *mapping,
pgoff_t index, bool trunc)
{
XA_STATE(xas, &mapping->i_pages, index);
int ret = 0;
void *entry;
struct radix_tree_root *pages = &mapping->i_pages;
xa_lock_irq(pages);
entry = get_unlocked_mapping_entry(mapping, index, NULL);
xas_lock_irq(&xas);
entry = get_unlocked_entry(&xas);
if (!entry || WARN_ON_ONCE(!xa_is_value(entry)))
goto out;
if (!trunc &&
(radix_tree_tag_get(pages, index, PAGECACHE_TAG_DIRTY) ||
radix_tree_tag_get(pages, index, PAGECACHE_TAG_TOWRITE)))
(xas_get_mark(&xas, PAGECACHE_TAG_DIRTY) ||
xas_get_mark(&xas, PAGECACHE_TAG_TOWRITE)))
goto out;
dax_disassociate_entry(entry, mapping, trunc);
radix_tree_delete(pages, index);
xas_store(&xas, NULL);
mapping->nrexceptional--;
ret = 1;
out:
put_unlocked_mapping_entry(mapping, index, entry);
xa_unlock_irq(pages);
put_unlocked_entry(&xas, entry);
xas_unlock_irq(&xas);
return ret;
}
/*
* Delete DAX entry at @index from @mapping. Wait for it
* to be unlocked before deleting it.