Merge branch 'for-4.10/fs-unmap' of git://git.kernel.dk/linux-block

Pull fs meta data unmap optimization from Jens Axboe:
 "A series from Jan Kara, providing a more efficient way for unmapping
  meta data from in the buffer cache than doing it block-by-block.

  Provide a general helper that existing callers can use"

* 'for-4.10/fs-unmap' of git://git.kernel.dk/linux-block:
  fs: Remove unmap_underlying_metadata
  fs: Add helper to clean bdev aliases under a bh and use it
  ext2: Use clean_bdev_aliases() instead of iteration
  ext4: Use clean_bdev_aliases() instead of iteration
  direct-io: Use clean_bdev_aliases() instead of handmade iteration
  fs: Provide function to unmap metadata for a range of blocks

3 files changed, 8 insertions, 25 deletions

diff --git a/fs/ext4/extents.c b/fs/ext4/extents.c
index 3e1014fe835e..b1f8416923ab 100644
--- a/fs/ext4/extents.c
+++ b/fs/ext4/extents.c
@@ -3777,14 +3777,6 @@ out:
 	return err;
 }
 
-static void unmap_underlying_metadata_blocks(struct block_device *bdev,
-			sector_t block, int count)
-{
-	int i;
-	for (i = 0; i < count; i++)
-                unmap_underlying_metadata(bdev, block + i);
-}
-
 /*
  * Handle EOFBLOCKS_FL flag, clearing it if necessary
  */
@@ -4121,9 +4113,8 @@ out:
 	 * new.
 	 */
 	if (allocated > map->m_len) {
-		unmap_underlying_metadata_blocks(inode->i_sb->s_bdev,
-					newblock + map->m_len,
-					allocated - map->m_len);
+		clean_bdev_aliases(inode->i_sb->s_bdev, newblock + map->m_len,
+				   allocated - map->m_len);
 		allocated = map->m_len;
 	}
 	map->m_len = allocated;
diff --git a/fs/ext4/inode.c b/fs/ext4/inode.c
index 72d593fa690d..88d57af1b516 100644
--- a/fs/ext4/inode.c
+++ b/fs/ext4/inode.c
@@ -661,12 +661,8 @@ found:
 		if (flags & EXT4_GET_BLOCKS_ZERO &&
 		    map->m_flags & EXT4_MAP_MAPPED &&
 		    map->m_flags & EXT4_MAP_NEW) {
-			ext4_lblk_t i;
-
-			for (i = 0; i < map->m_len; i++) {
-				unmap_underlying_metadata(inode->i_sb->s_bdev,
-							  map->m_pblk + i);
-			}
+			clean_bdev_aliases(inode->i_sb->s_bdev, map->m_pblk,
+					   map->m_len);
 			ret = ext4_issue_zeroout(inode, map->m_lblk,
 						 map->m_pblk, map->m_len);
 			if (ret) {
@@ -1137,8 +1133,7 @@ static int ext4_block_write_begin(struct page *page, loff_t pos, unsigned len,
 			if (err)
 				break;
 			if (buffer_new(bh)) {
-				unmap_underlying_metadata(bh->b_bdev,
-							  bh->b_blocknr);
+				clean_bdev_bh_alias(bh);
 				if (PageUptodate(page)) {
 					clear_buffer_new(bh);
 					set_buffer_uptodate(bh);
@@ -2371,11 +2366,8 @@ static int mpage_map_one_extent(handle_t *handle, struct mpage_da_data *mpd)
 
 	BUG_ON(map->m_len == 0);
 	if (map->m_flags & EXT4_MAP_NEW) {
-		struct block_device *bdev = inode->i_sb->s_bdev;
-		int i;
-
-		for (i = 0; i < map->m_len; i++)
-			unmap_underlying_metadata(bdev, map->m_pblk + i);
+		clean_bdev_aliases(inode->i_sb->s_bdev, map->m_pblk,
+				   map->m_len);
 	}
 	return 0;
 }
diff --git a/fs/ext4/page-io.c b/fs/ext4/page-io.c
index e2332a65e8fb..d83b0f3c5fe9 100644
--- a/fs/ext4/page-io.c
+++ b/fs/ext4/page-io.c
@@ -457,7 +457,7 @@ int ext4_bio_write_page(struct ext4_io_submit *io,
 		}
 		if (buffer_new(bh)) {
 			clear_buffer_new(bh);
-			unmap_underlying_metadata(bh->b_bdev, bh->b_blocknr);
+			clean_bdev_bh_alias(bh);
 		}
 		set_buffer_async_write(bh);
 		nr_to_submit++;