diff options
| author | David Sterba <dsterba@suse.com> | 2023-12-01 01:42:01 +0300 |
|---|---|---|
| committer | David Sterba <dsterba@suse.com> | 2023-12-16 00:59:01 +0300 |
| commit | 637e6e0f50d20dcf2f37d62b3f9edf9567b69503 (patch) | |
| tree | 7f2a599b4204a511f56e3684af9580697f79e2fc /fs/btrfs/btrfs_inode.h | |
| parent | ed9b50a13edf442f5493603cc54f73bfc6eca1e9 (diff) | |
| download | linux-637e6e0f50d20dcf2f37d62b3f9edf9567b69503.tar.xz | |
btrfs: allocate btrfs_inode::file_extent_tree only without NO_HOLES
The file_extent_tree was added in 41a2ee75aab0 ("btrfs: introduce
per-inode file extent tree") so we have an explicit mapping of the file
extents to know where it is safe to update i_size. When the feature
NO_HOLES is enabled, and it's been a mkfs default since 5.15, the tree
is not necessary.
To save some space in the inode, allocate the tree only when necessary.
This reduces size by 16 bytes from 1096 to 1080 on a x86_64 release
config.
Reviewed-by: Anand Jain <anand.jain@oracle.com>
Signed-off-by: David Sterba <dsterba@suse.com>
Diffstat (limited to 'fs/btrfs/btrfs_inode.h')
| -rw-r--r-- | fs/btrfs/btrfs_inode.h | 6 |
1 files changed, 4 insertions, 2 deletions
diff --git a/fs/btrfs/btrfs_inode.h b/fs/btrfs/btrfs_inode.h index 74a2b02669e7..bd629d011fdc 100644 --- a/fs/btrfs/btrfs_inode.h +++ b/fs/btrfs/btrfs_inode.h @@ -109,9 +109,11 @@ struct btrfs_inode { /* * Keep track of where the inode has extent items mapped in order to - * make sure the i_size adjustments are accurate + * make sure the i_size adjustments are accurate. Not required when the + * filesystem is NO_HOLES, the status can't be set while mounted as + * it's a mkfs-time feature. */ - struct extent_io_tree file_extent_tree; + struct extent_io_tree *file_extent_tree; /* held while logging the inode in tree-log.c */ struct mutex log_mutex; |