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| author | Christoph Hellwig <hch@lst.de> | 2023-06-15 08:48:39 +0200 |
|---|---|---|
| committer | Song Liu <song@kernel.org> | 2023-07-27 09:13:29 +0200 |
| commit | a34d4ef82c3c4bd8bda817e9fb53ef37c5595ddd (patch) | |
| tree | 19f0e7a3a90aadd603d603382a0a6fdb8a5cadd7 /drivers/md/md-bitmap.c | |
| parent | md-bitmap: don't use ->index for pages backing the bitmap file (diff) | |
| download | linux-a34d4ef82c3c4bd8bda817e9fb53ef37c5595ddd.tar.xz linux-a34d4ef82c3c4bd8bda817e9fb53ef37c5595ddd.zip | |
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.c | 15 |
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 |