linux-kernel - [PATCH v5 61/78] dax: Convert __dax_invalidate_mapping

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Message-Id: <20171215220450.7899-62-willy@infradead.org>
Date:   Fri, 15 Dec 2017 14:04:33 -0800
From:   Matthew Wilcox <willy@...radead.org>
To:     linux-kernel@...r.kernel.org
Cc:     Matthew Wilcox <mawilcox@...rosoft.com>,
        Ross Zwisler <ross.zwisler@...ux.intel.com>,
        David Howells <dhowells@...hat.com>,
        Shaohua Li <shli@...nel.org>, Jens Axboe <axboe@...nel.dk>,
        Rehas Sachdeva <aquannie@...il.com>,
        Marc Zyngier <marc.zyngier@....com>, linux-mm@...ck.org,
        linux-fsdevel@...r.kernel.org,
        linux-f2fs-devel@...ts.sourceforge.net,
        linux-nilfs@...r.kernel.org, linux-btrfs@...r.kernel.org,
        linux-xfs@...r.kernel.org, linux-usb@...r.kernel.org,
        linux-raid@...r.kernel.org
Subject: [PATCH v5 61/78] dax: Convert __dax_invalidate_mapping_entry to XArray

From: Matthew Wilcox <mawilcox@...rosoft.com>

Simple now that we already have an xa_state!

Signed-off-by: Matthew Wilcox <mawilcox@...rosoft.com>
---
 fs/dax.c | 10 +++++-----
 1 file changed, 5 insertions(+), 5 deletions(-)

diff --git a/fs/dax.c b/fs/dax.c
index 2629ffa70575..d3894c15609a 100644
--- a/fs/dax.c
+++ b/fs/dax.c
@@ -413,24 +413,24 @@ static int __dax_invalidate_mapping_entry(struct address_space *mapping,
 	XA_STATE(xas, &mapping->pages, index);
 	int ret = 0;
 	void *entry;
-	struct radix_tree_root *pages = &mapping->pages;
 
 	xa_lock_irq(&mapping->pages);
 	entry = get_unlocked_mapping_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_tag(&xas, PAGECACHE_TAG_DIRTY) ||
+	     xas_get_tag(&xas, PAGECACHE_TAG_TOWRITE)))
 		goto out;
-	radix_tree_delete(pages, index);
+	xas_store(&xas, NULL);
 	mapping->nrexceptional--;
 	ret = 1;
 out:
 	put_unlocked_mapping_entry(&xas, entry);
-	xa_unlock_irq(&mapping->pages);
+	xas_unlock_irq(&xas);
 	return ret;
 }
+
 /*
  * Delete DAX entry at @index from @mapping.  Wait for it
  * to be unlocked before deleting it.
-- 
2.15.1