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dax: coordinate locking for offsets in PMD range

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DAX radix tree locking currently locks entries based on the unique
combination of the 'mapping' pointer and the pgoff_t 'index' for the entry.
This works for PTEs, but as we move to PMDs we will need to have all the
offsets within the range covered by the PMD to map to the same bit lock.
To accomplish this, for ranges covered by a PMD entry we will instead lock
based on the page offset of the beginning of the PMD entry.  The 'mapping'
pointer is still used in the same way.

Signed-off-by: Ross Zwisler <[email protected]>
Reviewed-by: Christoph Hellwig <[email protected]>
Reviewed-by: Jan Kara <[email protected]>
Signed-off-by: Dave Chinner <[email protected]>
This commit is contained in:
Ross Zwisler 2016-11-08 11:32:20 +11:00 • committed by Dave Chinner
commit 63e95b5c4f
3 changed files with 43 additions and 26 deletions
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2
mm/filemap.c
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@ -143,7 +143,7 @@ static int page_cache_tree_insert(struct address_space *mapping,
if (node)
workingset_node_pages_dec(node);
/* Wakeup waiters for exceptional entry lock */
dax_wake_mapping_entry_waiter(mapping, page->index,
dax_wake_mapping_entry_waiter(mapping, page->index, p,
false);
}
}