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| author |  Filipe Manana <fdmanana@suse.com>
| 2023-09-28 11:12:50 +0100 |
|---|---|---|
| committer |  David Sterba <dsterba@suse.com>
| 2023-10-12 16:44:16 +0200 |
| commit | 9ef17228e1096e7e75bdde752ae1f0e9a5bcc8ab (patch) | |
| tree | e7d4c14204c7956845caf596c3ca865ef7e830ca /fs/btrfs/delayed-ref.h | |
| parent | btrfs: stop reserving excessive space for block group item updates (diff) | |
| download | linux-9ef17228e1096e7e75bdde752ae1f0e9a5bcc8ab.tar.gz linux-9ef17228e1096e7e75bdde752ae1f0e9a5bcc8ab.tar.bz2 linux-9ef17228e1096e7e75bdde752ae1f0e9a5bcc8ab.zip | |
btrfs: stop reserving excessive space for block group item insertions
Space for block group item insertions, necessary after allocating a new
block group, is reserved in the delayed refs block reserve. Currently we
do this by incrementing the transaction handle's delayed_ref_updates
counter and then calling btrfs_update_delayed_refs_rsv(), which will
increase the size of the delayed refs block reserve by an amount that
corresponds to the same amount we use for delayed refs, given by
btrfs_calc_delayed_ref_bytes().
That is an excessive amount because it corresponds to the amount of space
needed to insert one item in a btree (btrfs_calc_insert_metadata_size())
times 2 when the free space tree feature is enabled. All we need is an
amount as given by btrfs_calc_insert_metadata_size(), since we only need to
insert a block group item in the extent tree (or block group tree if this
feature is enabled). By using btrfs_calc_insert_metadata_size() we will
need to reserve 2 times less space when using the free space tree, putting
less pressure on space reservation.
So use helpers to reserve and release space for block group item
insertions that use btrfs_calc_insert_metadata_size() for calculation of
the space.
Signed-off-by: Filipe Manana <fdmanana@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
Diffstat (limited to 'fs/btrfs/delayed-ref.h')
| -rw-r--r-- | fs/btrfs/delayed-ref.h | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/fs/btrfs/delayed-ref.h b/fs/btrfs/delayed-ref.h index 250e8742a136..62d679d40f4f 100644 --- a/fs/btrfs/delayed-ref.h +++ b/fs/btrfs/delayed-ref.h @@ -436,6 +436,8 @@ int btrfs_check_delayed_seq(struct btrfs_fs_info *fs_info, u64 seq); void btrfs_delayed_refs_rsv_release(struct btrfs_fs_info *fs_info, int nr_refs, int nr_csums); void btrfs_update_delayed_refs_rsv(struct btrfs_trans_handle *trans); +void btrfs_inc_delayed_refs_rsv_bg_inserts(struct btrfs_fs_info *fs_info); +void btrfs_dec_delayed_refs_rsv_bg_inserts(struct btrfs_fs_info *fs_info); void btrfs_inc_delayed_refs_rsv_bg_updates(struct btrfs_fs_info *fs_info); void btrfs_dec_delayed_refs_rsv_bg_updates(struct btrfs_fs_info *fs_info); int btrfs_delayed_refs_rsv_refill(struct btrfs_fs_info *fs_info, |