[Devel] [PATCH RH7 3/3] ext4: cleanup clean_bdev_aliases() calls

[Pavel Tikhomirov]

From: "zhangyi (F)" <yi.zhang at huawei.com>

Now, we have already handle all cases of forgetting buffer in
jbd2_journal_forget(), the buffer should not be mapped to blockdevice
when reallocating it. So this patch remove all clean_bdev_aliases() and
clean_bdev_bh_alias() calls which were invoked by ext4 explicitly.

https://jira.sw.ru/browse/PSBM-96719

Suggested-by: Jan Kara <jack at suse.cz>
Signed-off-by: zhangyi (F) <yi.zhang at huawei.com>
Signed-off-by: Theodore Ts'o <tytso at mit.edu>
Reviewed-by: Jan Kara <jack at suse.cz>
(cherry picked from commit 16e08b14a4550bb167c48e918b26ef0d4980e9d1)
Signed-off-by: Pavel Tikhomirov <ptikhomirov at virtuozzo.com>
---
 fs/ext4/extents.c | 21 +--------------------
 fs/ext4/inode.c   | 13 -------------
 fs/ext4/page-io.c |  4 +---
 3 files changed, 2 insertions(+), 36 deletions(-)

diff --git a/fs/ext4/extents.c b/fs/ext4/extents.c
index a7ae908d79d4..8cc3a45c121b 100644
--- a/fs/ext4/extents.c
+++ b/fs/ext4/extents.c
@@ -3824,14 +3824,6 @@ static int ext4_convert_unwritten_extents_endio(handle_t *handle,
 	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
  */
@@ -4127,19 +4119,8 @@ ext4_ext_handle_unwritten_extents(handle_t *handle, struct inode *inode,
 	} else
 		allocated = ret;
 	map->m_flags |= EXT4_MAP_NEW;
-	/*
-	 * if we allocated more blocks than requested
-	 * we need to make sure we unmap the extra block
-	 * allocated. The actual needed block will get
-	 * unmapped later when we find the buffer_head marked
-	 * new.
-	 */
-	if (allocated > map->m_len) {
-		unmap_underlying_metadata_blocks(inode->i_sb->s_bdev,
-					newblock + map->m_len,
-					allocated - map->m_len);
+	if (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 e396b27726b8..4551c55370ad 100644
--- a/fs/ext4/inode.c
+++ b/fs/ext4/inode.c
@@ -652,12 +652,6 @@ int ext4_map_blocks(handle_t *handle, struct inode *inode,
 		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);
-			}
 			ret = ext4_issue_zeroout(inode, map->m_lblk,
 						 map->m_pblk, map->m_len);
 			if (ret) {
@@ -2142,13 +2136,6 @@ 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);
-	}
 	return 0;
 }
 
diff --git a/fs/ext4/page-io.c b/fs/ext4/page-io.c
index 80da8695356e..2ed60c2ffd37 100644
--- a/fs/ext4/page-io.c
+++ b/fs/ext4/page-io.c
@@ -458,10 +458,8 @@ int ext4_bio_write_page(struct ext4_io_submit *io,
 				ext4_io_submit(io);
 			continue;
 		}
-		if (buffer_new(bh)) {
+		if (buffer_new(bh))
 			clear_buffer_new(bh);
-			unmap_underlying_metadata(bh->b_bdev, bh->b_blocknr);
-		}
 		set_buffer_async_write(bh);
 	} while ((bh = bh->b_this_page) != head);
 
-- 
2.20.1