The patch titled
md/bitmap: use set_bit etc for bitmap page attributes
has been removed from the -mm tree. Its filename is
md-bitmap-use-set_bit-etc-for-bitmap-page-attributes.patch
This patch was dropped because it was merged into mainline or a subsystem tree
------------------------------------------------------
Subject: md/bitmap: use set_bit etc for bitmap page attributes
From: NeilBrown <neilb@xxxxxxx>
In particular, this means that we use 4 bits per page instead of a whole
unsigned long.
Signed-off-by: Neil Brown <neilb@xxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxx>
---
drivers/md/bitmap.c | 19 ++++++++++++-------
1 file changed, 12 insertions(+), 7 deletions(-)
diff -puN drivers/md/bitmap.c~md-bitmap-use-set_bit-etc-for-bitmap-page-attributes drivers/md/bitmap.c
--- a/drivers/md/bitmap.c~md-bitmap-use-set_bit-etc-for-bitmap-page-attributes
+++ a/drivers/md/bitmap.c
@@ -700,27 +700,27 @@ static void bitmap_file_kick(struct bitm
}
enum bitmap_page_attr {
- BITMAP_PAGE_DIRTY = 1, // there are set bits that need to be synced
- BITMAP_PAGE_CLEAN = 2, // there are bits that might need to be cleared
- BITMAP_PAGE_NEEDWRITE=4, // there are cleared bits that need to be synced
+ BITMAP_PAGE_DIRTY = 0, // there are set bits that need to be synced
+ BITMAP_PAGE_CLEAN = 1, // there are bits that might need to be cleared
+ BITMAP_PAGE_NEEDWRITE=2, // there are cleared bits that need to be synced
};
static inline void set_page_attr(struct bitmap *bitmap, struct page *page,
enum bitmap_page_attr attr)
{
- bitmap->filemap_attr[page->index] |= attr;
+ __set_bit((page->index<<2) + attr, bitmap->filemap_attr);
}
static inline void clear_page_attr(struct bitmap *bitmap, struct page *page,
enum bitmap_page_attr attr)
{
- bitmap->filemap_attr[page->index] &= ~attr;
+ __clear_bit((page->index<<2) + attr, bitmap->filemap_attr);
}
static inline unsigned long test_page_attr(struct bitmap *bitmap, struct page *page,
enum bitmap_page_attr attr)
{
- return bitmap->filemap_attr[page->index] & attr;
+ return test_bit((page->index<<2) + attr, bitmap->filemap_attr);
}
/*
@@ -872,7 +872,12 @@ static int bitmap_init_from_disk(struct
if (!bitmap->filemap)
goto out;
- bitmap->filemap_attr = kzalloc(sizeof(long) * num_pages, GFP_KERNEL);
+ /* We need 4 bits per page, rounded up to a multiple of sizeof(unsigned long) */
+ bitmap->filemap_attr = kzalloc(
+ (((num_pages*4/8)+sizeof(unsigned long)-1)
+ /sizeof(unsigned long))
+ *sizeof(unsigned long),
+ GFP_KERNEL);
if (!bitmap->filemap_attr)
goto out;
_
Patches currently in -mm which might be from neilb@xxxxxxx are
origin.patch
generic_file_buffered_write-deadlock-on-vectored-write.patch
md-dm-reduce-stack-usage-with-stacked-block-devices.patch
lockdep-annotate-sunrpc-code.patch
-
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