btrfs: store index number instead of key in struct btrfs_delayed_item

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All delayed items are for dir index keys, so there's really no point of
having an embedded struct btrfs_key in struct btrfs_delayed_item, which
makes the structure use more space than necessary (and adds a hole of 7
bytes).

So replace the key field with an index number (u64), which reduces the
size of struct btrfs_delayed_item from 112 bytes down to 96 bytes.

Some upcoming work will increase the structure size by 16 bytes, so this
change compensates for that future size increase.

Signed-off-by: Filipe Manana <fdmanana@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>

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This commit is contained in:

Filipe Manana 2022-08-17 12:22:40 +01:00 • committed by David Sterba

parent df4928818b

commit 96d89923fa

2 changed files with 56 additions and 53 deletions

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106

fs/btrfs/delayed-inode.c

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3

fs/btrfs/delayed-inode.h

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