[PATCH v5 4/5] dax: remove DAX code from page_cache_tree_insert()

Ross Zwisler
2017-07-24T17:06:25Z

Now that we no longer insert struct page pointers in DAX radix trees we can
remove the special casing for DAX in page_cache_tree_insert(). This also
allows us to make dax_wake_mapping_entry_waiter() local to fs/dax.c,
removing it from dax.h.

Signed-off-by: Ross Zwisler <ross.zwisler@linux.intel.com>
Suggested-by: Jan Kara <jack@suse.cz>
Reviewed-by: Jan Kara <jack@suse.cz>
---
fs/dax.c | 2 +-
include/linux/dax.h | 2 --
mm/filemap.c | 13 ++-----------
3 files changed, 3 insertions(+), 14 deletions(-)

diff --git a/fs/dax.c b/fs/dax.c
index 8f8bcb8..a0484a1 100644
--- a/fs/dax.c
+++ b/fs/dax.c
@@ -127,7 +127,7 @@ static int wake_exceptional_entry_func(wait_queue_entry_t *wait, unsigned int mo
* correct waitqueue where tasks might be waiting for that old 'entry' and
* wake them.
*/
-void dax_wake_mapping_entry_waiter(struct address_space *mapping,
+static void dax_wake_mapping_entry_waiter(struct address_space *mapping,
pgoff_t index, void *entry, bool wake_all)
{
struct exceptional_entry_key key;
diff --git a/include/linux/dax.h b/include/linux/dax.h
index 29cced8..afa99bb 100644
--- a/include/linux/dax.h
+++ b/include/linux/dax.h
@@ -122,8 +122,6 @@ int dax_iomap_fault(struct vm_fault *vmf, enum page_entry_size pe_size,
int dax_delete_mapping_entry(struct address_space *mapping, pgoff_t index);
int dax_invalidate_mapping_entry_sync(struct address_space *mapping,
pgoff_t index);
-void dax_wake_mapping_entry_waiter(struct address_space *mapping,
- pgoff_t index, void *entry, bool wake_all);

#ifdef CONFIG_FS_DAX
int __dax_zero_page_range(struct block_device *bdev,
diff --git a/mm/filemap.c b/mm/filemap.c
index a497024..1bf1265 100644
--- a/mm/filemap.c
+++ b/mm/filemap.c
@@ -130,17 +130,8 @@ static int page_cache_tree_insert(struct address_space *mapping,
return -EEXIST;

mapping->nrexceptional--;
- if (!dax_mapping(mapping)) {
- if (shadowp)
- *shadowp = p;
- } else {
- /* DAX can replace empty locked entry with a hole */
- WARN_ON_ONCE(p !=
- dax_radix_locked_entry(0, RADIX_DAX_EMPTY));
- /* Wakeup waiters for exceptional entry lock */
- dax_wake_mapping_entry_waiter(mapping, page->index, p,
- true);
- }
+ if (shadowp)
+ *shadowp = p;
}
__radix_tree_replace(&mapping->page_tree, node, slot, page,
workingset_update_node, mapping);
--
2.9.4