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md/bitmap: remove confusing code from filemap_get_page.

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file_page_index(store, 0) is *always* 0.
This is because the bitmap sb, at 256 bytes, is *always* less than
one page.
So subtracting it has no effect and the code should be removed.

Reported-by: Goldwyn Rodrigues <rgoldwyn@suse.de>
Signed-off-by: NeilBrown <neilb@suse.de>
This commit is contained in:
NeilBrown 2014-05-28 13:39:23 +10:00
parent cf170f3fa4
commit f2e06c5884
1 changed files with 1 additions and 5 deletions
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6
drivers/md/bitmap.c
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@ -669,17 +669,13 @@ static inline unsigned long file_page_offset(struct bitmap_storage *store,
/* /*
* return a pointer to the page in the filemap that contains the given bit * return a pointer to the page in the filemap that contains the given bit
* *
* this lookup is complicated by the fact that the bitmap sb might be exactly
* 1 page (e.g., x86) or less than 1 page -- so the bitmap might start on page
* 0 or page 1
*/ */
static inline struct page *filemap_get_page(struct bitmap_storage *store, static inline struct page *filemap_get_page(struct bitmap_storage *store,
unsigned long chunk) unsigned long chunk)
{ {
if (file_page_index(store, chunk) >= store->file_pages) if (file_page_index(store, chunk) >= store->file_pages)
return NULL; return NULL;
return store->filemap[file_page_index(store, chunk) return store->filemap[file_page_index(store, chunk)];
- file_page_index(store, 0)];
} }
static int bitmap_storage_alloc(struct bitmap_storage *store, static int bitmap_storage_alloc(struct bitmap_storage *store,