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ext4: replace i_delalloc_reserved_flag with EXT4_STATE_DELALLOC_RESERVED

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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>
This commit is contained in:
Theodore Ts'o
2011-01-10 12:12:36 -05:00
parent ad4fb9cafe
commit f232109773
5 changed files with 9 additions and 8 deletions
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6
fs/ext4/inode.c
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@@ -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