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authorChristoph Hellwig <hch@lst.de>2023-06-15 09:48:39 +0300
committerSong Liu <song@kernel.org>2023-07-27 10:13:29 +0300
commita34d4ef82c3c4bd8bda817e9fb53ef37c5595ddd (patch)
tree19f0e7a3a90aadd603d603382a0a6fdb8a5cadd7 /drivers/md/md-bitmap.c
parentd7038f951828da19fa9aafddfa087b69032c9687 (diff)
downloadlinux-a34d4ef82c3c4bd8bda817e9fb53ef37c5595ddd.tar.xz
md: make bitmap file support optional
The support for write intent bitmaps in files on an external files in md is a hot mess that abuses ->bmap to map file offsets into physical device objects, and also abuses buffer_heads in a creative way. Make this code optional so that MD can be built into future kernels without buffer_head support, and so that we can eventually deprecate it. Note this does not affect the internal bitmap support, which has none of the problems. Signed-off-by: Christoph Hellwig <hch@lst.de> Reviewed-by: Hannes Reinecke <hare@suse.de> Reviewed-by: Himanshu Madhani <himanshu.madhani@oracle.com> Signed-off-by: Song Liu <song@kernel.org> Link: https://lore.kernel.org/r/20230615064840.629492-11-hch@lst.de
Diffstat (limited to 'drivers/md/md-bitmap.c')
-rw-r--r--drivers/md/md-bitmap.c15
1 files changed, 15 insertions, 0 deletions
diff --git a/drivers/md/md-bitmap.c b/drivers/md/md-bitmap.c
index a280bfd29f65..a58a4c30265e 100644
--- a/drivers/md/md-bitmap.c
+++ b/drivers/md/md-bitmap.c
@@ -295,6 +295,7 @@ static void write_sb_page(struct bitmap *bitmap, unsigned long pg_index,
static void md_bitmap_file_kick(struct bitmap *bitmap);
+#ifdef CONFIG_MD_BITMAP_FILE
static void write_file_page(struct bitmap *bitmap, struct page *page, int wait)
{
struct buffer_head *bh = page_buffers(page);
@@ -408,6 +409,20 @@ out:
ret);
return ret;
}
+#else /* CONFIG_MD_BITMAP_FILE */
+static void write_file_page(struct bitmap *bitmap, struct page *page, int wait)
+{
+}
+static int read_file_page(struct file *file, unsigned long index,
+ struct bitmap *bitmap, unsigned long count, struct page *page)
+{
+ return -EIO;
+}
+static void free_buffers(struct page *page)
+{
+ put_page(page);
+}
+#endif /* CONFIG_MD_BITMAP_FILE */
/*
* bitmap file superblock operations