From 925c86a19bacf8ce10eb666328fb3fa5aff7b951 Mon Sep 17 00:00:00 2001 From: Christoph Hellwig Date: Tue, 1 Aug 2023 19:22:01 +0200 Subject: fs: add CONFIG_BUFFER_HEAD Add a new config option that controls building the buffer_head code, and select it from all file systems and stacking drivers that need it. For the block device nodes and alternative iomap based buffered I/O path is provided when buffer_head support is not enabled, and iomap needs a a small tweak to define the IOMAP_F_BUFFER_HEAD flag to 0 to not call into the buffer_head code when it doesn't exist. Otherwise this is just Kconfig and ifdef changes. Signed-off-by: Christoph Hellwig Reviewed-by: Luis Chamberlain Reviewed-by: Johannes Thumshirn Link: https://lore.kernel.org/r/20230801172201.1923299-7-hch@lst.de Signed-off-by: Jens Axboe --- include/trace/events/block.h | 2 ++ 1 file changed, 2 insertions(+) (limited to 'include/trace') diff --git a/include/trace/events/block.h b/include/trace/events/block.h index 40e60c33cc6f..0e128ad51460 100644 --- a/include/trace/events/block.h +++ b/include/trace/events/block.h @@ -12,6 +12,7 @@ #define RWBS_LEN 8 +#ifdef CONFIG_BUFFER_HEAD DECLARE_EVENT_CLASS(block_buffer, TP_PROTO(struct buffer_head *bh), @@ -61,6 +62,7 @@ DEFINE_EVENT(block_buffer, block_dirty_buffer, TP_ARGS(bh) ); +#endif /* CONFIG_BUFFER_HEAD */ /** * block_rq_requeue - place block IO request back on a queue -- cgit v1.2.3