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authorNeilBrown <neilb@suse.de>2006-06-26 00:27:45 -0700
committerLinus Torvalds <torvalds@g5.osdl.org>2006-06-26 09:58:38 -0700
commite16b68b6e456a61b895a198baf5aa473cf2a32bf (patch)
tree0d592ee3c7245f4958dcd337cc506e650cefac2c
parentec7a3197f4777eff5039251d0e08a031b3372d6c (diff)
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[PATCH] md/bitmap: use set_bit etc for bitmap page attributes
In particular, this means that we use 4 bits per page instead of a whole unsigned long. Signed-off-by: Neil Brown <neilb@suse.de> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
-rw-r--r--drivers/md/bitmap.c19
1 files changed, 12 insertions, 7 deletions
diff --git a/drivers/md/bitmap.c b/drivers/md/bitmap.c
index 0f173257077..2e257d5998b 100644
--- a/drivers/md/bitmap.c
+++ b/drivers/md/bitmap.c
@@ -700,27 +700,27 @@ static void bitmap_file_kick(struct bitmap *bitmap)
}
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 bitmap *bitmap, sector_t start)
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;