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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@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/20230615064840.629492-12-hch@lst.de
This commit is contained in:
Christoph Hellwig 2023-06-15 08:48:40 +02:00 committed by Song Liu
parent a34d4ef82c
commit 0ae1c9d384
2 changed files with 3 additions and 1 deletions
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2
drivers/md/Kconfig
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@ -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

2
drivers/md/md.c
View File

@ -7049,6 +7049,8 @@ 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);