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page cache: use xa_lock

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Remove the address_space ->tree_lock and use the xa_lock newly added to
the radix_tree_root.  Rename the address_space ->page_tree to ->i_pages,
since we don't really care that it's a tree.

[willy@infradead.org: fix nds32, fs/dax.c]
  Link: http://lkml.kernel.org/r/20180406145415.GB20605@bombadil.infradead.orgLink: http://lkml.kernel.org/r/20180313132639.17387-9-willy@infradead.org
Signed-off-by: Matthew Wilcox <mawilcox@microsoft.com>
Acked-by: Jeff Layton <jlayton@redhat.com>
Cc: Darrick J. Wong <darrick.wong@oracle.com>
Cc: Dave Chinner <david@fromorbit.com>
Cc: Ryusuke Konishi <konishi.ryusuke@lab.ntt.co.jp>
Cc: Will Deacon <will.deacon@arm.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Matthew Wilcox 2018-04-10 16:36:56 -07:00 • committed by Linus Torvalds
parent f6bb2a2c0b
commit b93b016313
39 changed files with 345 additions and 366 deletions
Download patch file Download diff file Expand all files Collapse all files

13
fs/buffer.c
View file

@ -185,10 +185,9 @@ EXPORT_SYMBOL(end_buffer_write_sync);
* we get exclusion from try_to_free_buffers with the blockdev mapping's
* private_lock.
*
* Hack idea: for the blockdev mapping, i_bufferlist_lock contention
* Hack idea: for the blockdev mapping, private_lock contention
* may be quite high. This code could TryLock the page, and if that
* succeeds, there is no need to take private_lock. (But if
* private_lock is contended then so is mapping->tree_lock).
* succeeds, there is no need to take private_lock.
*/
static struct buffer_head *
__find_get_block_slow(struct block_device *bdev, sector_t block)
@ -599,14 +598,14 @@ void __set_page_dirty(struct page *page, struct address_space *mapping,
{
unsigned long flags;
spin_lock_irqsave(&mapping->tree_lock, flags);
xa_lock_irqsave(&mapping->i_pages, flags);
if (page->mapping) { /* Race with truncate? */
WARN_ON_ONCE(warn && !PageUptodate(page));
account_page_dirtied(page, mapping);
radix_tree_tag_set(&mapping->page_tree,
radix_tree_tag_set(&mapping->i_pages,
page_index(page), PAGECACHE_TAG_DIRTY);
}
spin_unlock_irqrestore(&mapping->tree_lock, flags);
xa_unlock_irqrestore(&mapping->i_pages, flags);
}
EXPORT_SYMBOL_GPL(__set_page_dirty);
@ -1096,7 +1095,7 @@ __getblk_slow(struct block_device *bdev, sector_t block,
* inode list.
*
* mark_buffer_dirty() is atomic. It takes bh->b_page->mapping->private_lock,
* mapping->tree_lock and mapping->host->i_lock.
* i_pages lock and mapping->host->i_lock.
*/
void mark_buffer_dirty(struct buffer_head *bh)
{