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btrfs: factor init_extent_buffer from __alloc_extent_buffer

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In preparation for preallocating extent_buffer data, factor eb
initialization away from specifically allocating it. This allows us to
allocate the eb, bfs, folios, etc. together in the main search_slot code
paths, but still share initialization code with the dummy/test/clone
allocation paths.

Reviewed-by: Filipe Manana <fdmanana@suse.com>
Signed-off-by: Boris Burkov <boris@bur.io>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
This commit is contained in:
Boris Burkov 2026-07-21 15:42:12 -07:00 committed by David Sterba
parent 9102b17951
commit e8e7aff88e
1 changed files with 12 additions and 8 deletions
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20
fs/btrfs/extent_io.c
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@ -3309,12 +3309,9 @@ void btrfs_uninhibit_all_eb_writeback(struct btrfs_trans_handle *trans)
trans->inhibited_ebs_hand = 0;
}
static struct extent_buffer *__alloc_extent_buffer(struct btrfs_fs_info *fs_info,
u64 start)
static void init_extent_buffer(struct btrfs_fs_info *fs_info,
struct extent_buffer *eb, u64 start)
{
struct extent_buffer *eb = NULL;
eb = kmem_cache_zalloc(extent_buffer_cache, GFP_NOFS|__GFP_NOFAIL);
eb->start = start;
eb->len = fs_info->nodesize;
eb->fs_info = fs_info;
@ -3327,7 +3324,15 @@ static struct extent_buffer *__alloc_extent_buffer(struct btrfs_fs_info *fs_info
refcount_set(&eb->refs, 1);
ASSERT(eb->len <= BTRFS_MAX_METADATA_BLOCKSIZE);
}
static struct extent_buffer *__alloc_extent_buffer(struct btrfs_fs_info *fs_info,
u64 start)
{
struct extent_buffer *eb;
eb = kmem_cache_zalloc(extent_buffer_cache, GFP_NOFS | __GFP_NOFAIL);
init_extent_buffer(fs_info, eb, start);
return eb;
}
@ -3731,9 +3736,8 @@ struct extent_buffer *alloc_extent_buffer(struct btrfs_fs_info *fs_info,
if (eb)
return eb;
eb = __alloc_extent_buffer(fs_info, start);
if (!eb)
return ERR_PTR(-ENOMEM);
eb = kmem_cache_zalloc(extent_buffer_cache, GFP_NOFS | __GFP_NOFAIL);
init_extent_buffer(fs_info, eb, start);
/*
* The reloc trees are just snapshots, so we need them to appear to be