[PATCH 11/11] md: deprecate bitmap file support

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The support for bitmaps on files is a very bad idea abusing various kernel
APIs, and fundamentally requires the file to not be on the actual array
without a way to check that this is actually the case.  Add a deprecation
warning to see if we might be able to eventually drop it.

Signed-off-by: Christoph Hellwig <hch@xxxxxx>
---
 drivers/md/Kconfig | 2 +-
 drivers/md/md.c    | 2 ++
 2 files changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/md/Kconfig b/drivers/md/Kconfig
index 9712ab9bcba52e..444517d1a2336a 100644
--- a/drivers/md/Kconfig
+++ b/drivers/md/Kconfig
@@ -51,7 +51,7 @@ config MD_AUTODETECT
 	  If unsure, say Y.
 
 config MD_BITMAP_FILE
-	bool "MD bitmap file support"
+	bool "MD bitmap file support (deprecated)"
 	default y
 	help
 	  If you say Y here, support for write intent bitmaps in files on an
diff --git a/drivers/md/md.c b/drivers/md/md.c
index c9fcefaf9c073b..d04a91295edf9d 100644
--- a/drivers/md/md.c
+++ b/drivers/md/md.c
@@ -7026,6 +7026,8 @@ static int set_bitmap_file(struct mddev *mddev, int fd)
 				mdname(mddev));
 			return -EINVAL;
 		}
+		pr_warn("%s: using deprecated bitmap file support\n",
+			mdname(mddev));
 
 		f = fget(fd);
 
-- 
2.39.2




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