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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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3
fs/ext4/balloc.c
View file

@ -592,7 +592,8 @@ ext4_fsblk_t ext4_new_meta_blocks(handle_t *handle, struct inode *inode,
* Account for the allocated meta blocks. We will never
* fail EDQUOT for metdata, but we do account for it.
*/
if (!(*errp) && EXT4_I(inode)->i_delalloc_reserved_flag) {
if (!(*errp) &&
ext4_test_inode_state(inode, EXT4_STATE_DELALLOC_RESERVED)) {
spin_lock(&EXT4_I(inode)->i_block_reservation_lock);
EXT4_I(inode)->i_allocated_meta_blocks += ar.len;
spin_unlock(&EXT4_I(inode)->i_block_reservation_lock);

2
fs/ext4/ext4.h
View file

@ -828,7 +828,6 @@ struct ext4_inode_info {
unsigned int i_reserved_data_blocks;
unsigned int i_reserved_meta_blocks;
unsigned int i_allocated_meta_blocks;
unsigned short i_delalloc_reserved_flag;
sector_t i_da_metadata_calc_last_lblock;
int i_da_metadata_calc_len;
@ -1235,6 +1234,7 @@ enum {
EXT4_STATE_EXT_MIGRATE, /* Inode is migrating */
EXT4_STATE_DIO_UNWRITTEN, /* need convert on dio done*/
EXT4_STATE_NEWENTRY, /* File just added to dir */
EXT4_STATE_DELALLOC_RESERVED, /* blks already reserved for delalloc */
};
#define EXT4_INODE_BIT_FNS(name, field) \

6
fs/ext4/inode.c
View file

@ -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

5
fs/ext4/mballoc.c
View file

@ -4283,7 +4283,7 @@ ext4_fsblk_t ext4_mb_new_blocks(handle_t *handle,
* EDQUOT check, as blocks and quotas have been already
* reserved when data being copied into pagecache.
*/
if (EXT4_I(ar->inode)->i_delalloc_reserved_flag)
if (ext4_test_inode_state(ar->inode, EXT4_STATE_DELALLOC_RESERVED))
ar->flags |= EXT4_MB_DELALLOC_RESERVED;
else {
/* Without delayed allocation we need to verify
@ -4380,7 +4380,8 @@ out:
if (inquota && ar->len < inquota)
dquot_free_block(ar->inode, inquota - ar->len);
if (!ar->len) {
if (!EXT4_I(ar->inode)->i_delalloc_reserved_flag)
if (!ext4_test_inode_state(ar->inode,
EXT4_STATE_DELALLOC_RESERVED))
/* release all the reserved blocks if non delalloc */
percpu_counter_sub(&sbi->s_dirtyblocks_counter,
reserv_blks);

1
fs/ext4/super.c
View file

@ -828,7 +828,6 @@ static struct inode *ext4_alloc_inode(struct super_block *sb)
ei->i_reserved_meta_blocks = 0;
ei->i_allocated_meta_blocks = 0;
ei->i_da_metadata_calc_len = 0;
ei->i_delalloc_reserved_flag = 0;
spin_lock_init(&(ei->i_block_reservation_lock));
#ifdef CONFIG_QUOTA
ei->i_reserved_quota = 0;