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Message-Id: <20171215220450.7899-63-willy@infradead.org>
Date: Fri, 15 Dec 2017 14:04:34 -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 62/78] dax: Convert dax_writeback_one to XArray
From: Matthew Wilcox <mawilcox@...rosoft.com>
Likewise easy
Signed-off-by: Matthew Wilcox <mawilcox@...rosoft.com>
---
fs/dax.c | 17 +++++++----------
1 file changed, 7 insertions(+), 10 deletions(-)
diff --git a/fs/dax.c b/fs/dax.c
index d3894c15609a..d6dd779e1b46 100644
--- a/fs/dax.c
+++ b/fs/dax.c
@@ -633,8 +633,7 @@ static int dax_writeback_one(struct block_device *bdev,
struct dax_device *dax_dev, struct address_space *mapping,
pgoff_t index, void *entry)
{
- struct radix_tree_root *pages = &mapping->pages;
- XA_STATE(xas, pages, index);
+ XA_STATE(xas, &mapping->pages, index);
void *entry2, *kaddr;
long ret = 0, id;
sector_t sector;
@@ -649,7 +648,7 @@ static int dax_writeback_one(struct block_device *bdev,
if (WARN_ON(!xa_is_value(entry)))
return -EIO;
- xa_lock_irq(&mapping->pages);
+ xas_lock_irq(&xas);
entry2 = get_unlocked_mapping_entry(&xas);
/* Entry got punched out / reallocated? */
if (!entry2 || WARN_ON_ONCE(!xa_is_value(entry2)))
@@ -668,7 +667,7 @@ static int dax_writeback_one(struct block_device *bdev,
}
/* Another fsync thread may have already written back this entry */
- if (!radix_tree_tag_get(pages, index, PAGECACHE_TAG_TOWRITE))
+ if (!xas_get_tag(&xas, PAGECACHE_TAG_TOWRITE))
goto put_unlocked;
/* Lock the entry to serialize with page faults */
entry = lock_slot(&xas);
@@ -679,8 +678,8 @@ static int dax_writeback_one(struct block_device *bdev,
* at the entry only under xa_lock and once they do that they will
* see the entry locked and wait for it to unlock.
*/
- radix_tree_tag_clear(pages, index, PAGECACHE_TAG_TOWRITE);
- xa_unlock_irq(&mapping->pages);
+ xas_clear_tag(&xas, PAGECACHE_TAG_TOWRITE);
+ xas_unlock_irq(&xas);
/*
* Even if dax_writeback_mapping_range() was given a wbc->range_start
@@ -718,9 +717,7 @@ static int dax_writeback_one(struct block_device *bdev,
* the pfn mappings are writeprotected and fault waits for mapping
* entry lock.
*/
- xa_lock_irq(&mapping->pages);
- radix_tree_tag_clear(pages, index, PAGECACHE_TAG_DIRTY);
- xa_unlock_irq(&mapping->pages);
+ xa_clear_tag(&mapping->pages, index, PAGECACHE_TAG_DIRTY);
trace_dax_writeback_one(mapping->host, index, size >> PAGE_SHIFT);
dax_unlock:
dax_read_unlock(id);
@@ -729,7 +726,7 @@ static int dax_writeback_one(struct block_device *bdev,
put_unlocked:
put_unlocked_mapping_entry(&xas, entry2);
- xa_unlock_irq(&mapping->pages);
+ xas_unlock_irq(&xas);
return ret;
}
--
2.15.1
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