[PATCH] ext4: Automatic setting of {INODE,BLOCK}_UNINIT flags

[Tomas Racek <tracek@redhat.com>]

When last inode from bg is freed, set the INODE_UNINIT flag, similarly
when last block is freed, set BLOCK_UNINIT flag. This can speed up
subsequent fsck run.

Signed-off-by: Tomas Racek <tracek@redhat.com>
---
 fs/ext4/ialloc.c  | 4 ++++
 fs/ext4/mballoc.c | 4 ++++
 2 files changed, 8 insertions(+)

diff --git a/fs/ext4/ialloc.c b/fs/ext4/ialloc.c
index 4facdd2..6e4b982 100644
--- a/fs/ext4/ialloc.c
+++ b/fs/ext4/ialloc.c
@@ -289,6 +289,10 @@ void ext4_free_inode(handle_t *handle, struct inode *inode)
 
 	count = ext4_free_inodes_count(sb, gdp) + 1;
 	ext4_free_inodes_set(sb, gdp, count);
+
+	if (count == EXT4_INODES_PER_GROUP(sb))
+               gdp->bg_flags |= cpu_to_le16(EXT4_BG_INODE_UNINIT);
+
 	if (is_directory) {
 		count = ext4_used_dirs_count(sb, gdp) - 1;
 		ext4_used_dirs_set(sb, gdp, count);
diff --git a/fs/ext4/mballoc.c b/fs/ext4/mballoc.c
index 526e553..28bce35 100644
--- a/fs/ext4/mballoc.c
+++ b/fs/ext4/mballoc.c
@@ -4665,6 +4665,10 @@ do_more:
 
 	ret = ext4_free_group_clusters(sb, gdp) + count_clusters;
 	ext4_free_group_clusters_set(sb, gdp, ret);
+
+	if(ret == EXT4_BLOCKS_PER_GROUP(sb))
+		gdp->bg_flags |= cpu_to_le16(EXT4_BG_BLOCK_UNINIT);
+
 	ext4_block_bitmap_csum_set(sb, block_group, gdp, bitmap_bh);
 	ext4_group_desc_csum_set(sb, block_group, gdp);
 	ext4_unlock_group(sb, block_group);
-- 
1.7.11.7