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btrfs: avoid linker error in btrfs_find_create_tree_block()

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The inline function btrfs_is_testing() is hardcoded to return 0 if
CONFIG_BTRFS_FS_RUN_SANITY_TESTS is not set. Currently we're relying on
the compiler optimizing out the call to alloc_test_extent_buffer() in
btrfs_find_create_tree_block(), as it's not been defined (it's behind an
 #ifdef).

Add a stub version of alloc_test_extent_buffer() to avoid linker errors
on non-standard optimization levels. This problem was seen on GCC 14
with -O0 and is helps to see symbols that would be otherwise optimized
out.

Reviewed-by: Qu Wenruo <wqu@suse.com>
Signed-off-by: Mark Harmstone <maharmstone@fb.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
This commit is contained in:
Mark Harmstone
2025-03-06 10:58:46 +00:00
committed by David Sterba
parent df94a342ef
commit 7ef3cbf17d
1 changed files with 5 additions and 2 deletions
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7
fs/btrfs/extent_io.c
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@@ -3006,10 +3006,10 @@ struct extent_buffer *find_extent_buffer(struct btrfs_fs_info *fs_info,
return eb;
}
#ifdef CONFIG_BTRFS_FS_RUN_SANITY_TESTS
struct extent_buffer *alloc_test_extent_buffer(struct btrfs_fs_info *fs_info,
u64 start)
{
#ifdef CONFIG_BTRFS_FS_RUN_SANITY_TESTS
struct extent_buffer *eb, *exists = NULL;
int ret;
@@ -3045,8 +3045,11 @@ struct extent_buffer *alloc_test_extent_buffer(struct btrfs_fs_info *fs_info,
free_eb:
btrfs_release_extent_buffer(eb);
return exists;
}
#else
/* Stub to avoid linker error when compiled with optimizations turned off. */
return NULL;
#endif
}
static struct extent_buffer *grab_extent_buffer(struct btrfs_fs_info *fs_info,
struct folio *folio)