ext4: replace i_delalloc_reserved_flag with EXT4_STATE_DELALLOC_RESERVED

Remove the short element i_delalloc_reserved_flag from the
ext4_inode_info structure and replace it a new bit in i_state_flags.
Since we have an ext4_inode_info for every ext4 inode cached in the
inode cache, any savings we can produce here is a very good thing from
a memory utilization perspective.

Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>

1 files changed, 3 insertions, 3 deletions

diff --git a/fs/ext4/inode.c b/fs/ext4/inode.c
index c0fe426d444a..ac08460921aa 100644
--- a/fs/ext4/inode.c
+++ b/fs/ext4/inode.c
@@ -1330,7 +1330,7 @@ int ext4_map_blocks(handle_t *handle, struct inode *inode,
          * avoid double accounting
          */
         if (flags & EXT4_GET_BLOCKS_DELALLOC_RESERVE)
-                EXT4_I(inode)->i_delalloc_reserved_flag = 1;
+                ext4_set_inode_state(inode, EXT4_STATE_DELALLOC_RESERVED);
         /*
          * We need to check for EXT4 here because migrate
          * could have changed the inode type in between
@@ -1360,7 +1360,7 @@ int ext4_map_blocks(handle_t *handle, struct inode *inode,
                         ext4_da_update_reserve_space(inode, retval, 1);
         }
         if (flags & EXT4_GET_BLOCKS_DELALLOC_RESERVE)
-                EXT4_I(inode)->i_delalloc_reserved_flag = 0;
+                ext4_clear_inode_state(inode, EXT4_STATE_DELALLOC_RESERVED);
 
         up_write((&EXT4_I(inode)->i_data_sem));
         if (retval > 0 && map->m_flags & EXT4_MAP_MAPPED) {
@@ -2249,7 +2249,7 @@ static void mpage_da_map_and_submit(struct mpage_da_data *mpd)
          * affects functions in many different parts of the allocation
          * call path.  This flag exists primarily because we don't
          * want to change *many* call functions, so ext4_map_blocks()
-         * will set the magic i_delalloc_reserved_flag once the
+         * will set the EXT4_STATE_DELALLOC_RESERVED flag once the
          * inode's allocation semaphore is taken.
          *
          * If the blocks in questions were delalloc blocks, set