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md/bitmap: discard CHUNK_BLOCK_SHIFT macro

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Be redefining ->chunkshift as the shift from sectors to chunks rather
than bytes to chunks, we can just use "bitmap->chunkshift" which is
shorter than the macro call, and less indirect.

Signed-off-by: NeilBrown <neilb@suse.de>
This commit is contained in:
NeilBrown 2012-03-19 12:46:41 +11:00
parent 792a1d4bbf
commit 61a0d80ce4
2 changed files with 19 additions and 19 deletions
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35
drivers/md/bitmap.c
View File

@ -838,7 +838,7 @@ static void bitmap_file_set_bit(struct bitmap *bitmap, sector_t block)
unsigned long bit;
struct page *page;
void *kaddr;
unsigned long chunk = block >> CHUNK_BLOCK_SHIFT(bitmap);
unsigned long chunk = block >> bitmap->chunkshift;
if (!bitmap->filemap)
return;
@ -1037,10 +1037,10 @@ static int bitmap_init_from_disk(struct bitmap *bitmap, sector_t start)
kunmap_atomic(paddr, KM_USER0);
if (b) {
/* if the disk bit is set, set the memory bit */
int needed = ((sector_t)(i+1) << (CHUNK_BLOCK_SHIFT(bitmap))
int needed = ((sector_t)(i+1) << bitmap->chunkshift
>= start);
bitmap_set_memory_bits(bitmap,
(sector_t)i << CHUNK_BLOCK_SHIFT(bitmap),
(sector_t)i << bitmap->chunkshift,
needed);
bit_cnt++;
}
@ -1084,7 +1084,7 @@ void bitmap_write_all(struct bitmap *bitmap)
static void bitmap_count_page(struct bitmap *bitmap, sector_t offset, int inc)
{
sector_t chunk = offset >> CHUNK_BLOCK_SHIFT(bitmap);
sector_t chunk = offset >> bitmap->chunkshift;
unsigned long page = chunk >> PAGE_COUNTER_SHIFT;
bitmap->bp[page].count += inc;
bitmap_checkfree(bitmap, page);
@ -1190,7 +1190,7 @@ void bitmap_daemon_work(struct mddev *mddev)
bitmap->allclean = 0;
}
bmc = bitmap_get_counter(bitmap,
(sector_t)j << CHUNK_BLOCK_SHIFT(bitmap),
(sector_t)j << bitmap->chunkshift,
&blocks, 0);
if (!bmc)
j |= PAGE_COUNTER_MASK;
@ -1199,7 +1199,7 @@ void bitmap_daemon_work(struct mddev *mddev)
/* we can clear the bit */
*bmc = 0;
bitmap_count_page(bitmap,
(sector_t)j << CHUNK_BLOCK_SHIFT(bitmap),
(sector_t)j << bitmap->chunkshift,
-1);
/* clear the bit */
@ -1253,7 +1253,7 @@ __acquires(bitmap->lock)
* The lock must have been taken with interrupts enabled.
* If !create, we don't release the lock.
*/
sector_t chunk = offset >> CHUNK_BLOCK_SHIFT(bitmap);
sector_t chunk = offset >> bitmap->chunkshift;
unsigned long page = chunk >> PAGE_COUNTER_SHIFT;
unsigned long pageoff = (chunk & PAGE_COUNTER_MASK) << COUNTER_BYTE_SHIFT;
sector_t csize;
@ -1263,10 +1263,10 @@ __acquires(bitmap->lock)
if (bitmap->bp[page].hijacked ||
bitmap->bp[page].map == NULL)
csize = ((sector_t)1) << (CHUNK_BLOCK_SHIFT(bitmap) +
csize = ((sector_t)1) << (bitmap->chunkshift +
PAGE_COUNTER_SHIFT - 1);
else
csize = ((sector_t)1) << (CHUNK_BLOCK_SHIFT(bitmap));
csize = ((sector_t)1) << bitmap->chunkshift;
*blocks = csize - (offset & (csize - 1));
if (err < 0)
@ -1392,7 +1392,7 @@ void bitmap_endwrite(struct bitmap *bitmap, sector_t offset, unsigned long secto
set_page_attr(bitmap,
filemap_get_page(
bitmap,
offset >> CHUNK_BLOCK_SHIFT(bitmap)),
offset >> bitmap->chunkshift),
BITMAP_PAGE_PENDING);
bitmap->allclean = 0;
}
@ -1480,7 +1480,7 @@ void bitmap_end_sync(struct bitmap *bitmap, sector_t offset, sector_t *blocks, i
else {
if (*bmc <= 2) {
set_page_attr(bitmap,
filemap_get_page(bitmap, offset >> CHUNK_BLOCK_SHIFT(bitmap)),
filemap_get_page(bitmap, offset >> bitmap->chunkshift),
BITMAP_PAGE_PENDING);
bitmap->allclean = 0;
}
@ -1527,7 +1527,7 @@ void bitmap_cond_end_sync(struct bitmap *bitmap, sector_t sector)
bitmap->mddev->curr_resync_completed = sector;
set_bit(MD_CHANGE_CLEAN, &bitmap->mddev->flags);
sector &= ~((1ULL << CHUNK_BLOCK_SHIFT(bitmap)) - 1);
sector &= ~((1ULL << bitmap->chunkshift) - 1);
s = 0;
while (s < sector && s < bitmap->mddev->resync_max_sectors) {
bitmap_end_sync(bitmap, s, &blocks, 0);
@ -1557,7 +1557,7 @@ static void bitmap_set_memory_bits(struct bitmap *bitmap, sector_t offset, int n
struct page *page;
*bmc = 2 | (needed ? NEEDED_MASK : 0);
bitmap_count_page(bitmap, offset, 1);
page = filemap_get_page(bitmap, offset >> CHUNK_BLOCK_SHIFT(bitmap));
page = filemap_get_page(bitmap, offset >> bitmap->chunkshift);
set_page_attr(bitmap, page, BITMAP_PAGE_PENDING);
bitmap->allclean = 0;
}
@ -1570,7 +1570,7 @@ void bitmap_dirty_bits(struct bitmap *bitmap, unsigned long s, unsigned long e)
unsigned long chunk;
for (chunk = s; chunk <= e; chunk++) {
sector_t sec = (sector_t)chunk << CHUNK_BLOCK_SHIFT(bitmap);
sector_t sec = (sector_t)chunk << bitmap->chunkshift;
bitmap_set_memory_bits(bitmap, sec, 1);
spin_lock_irq(&bitmap->lock);
bitmap_file_set_bit(bitmap, sec);
@ -1727,11 +1727,12 @@ int bitmap_create(struct mddev *mddev)
goto error;
bitmap->daemon_lastrun = jiffies;
bitmap->chunkshift = ffz(~mddev->bitmap_info.chunksize);
bitmap->chunkshift = (ffz(~mddev->bitmap_info.chunksize)
- BITMAP_BLOCK_SHIFT);
/* now that chunksize and chunkshift are set, we can use these macros */
chunks = (blocks + CHUNK_BLOCK_RATIO(bitmap) - 1) >>
CHUNK_BLOCK_SHIFT(bitmap);
chunks = (blocks + bitmap->chunkshift - 1) >>
bitmap->chunkshift;
pages = (chunks + PAGE_COUNTER_RATIO - 1) / PAGE_COUNTER_RATIO;
BUG_ON(!pages);

3
drivers/md/bitmap.h
View File

@ -103,7 +103,6 @@ typedef __u16 bitmap_counter_t;
/* how many blocks per chunk? (this is variable) */
#define CHUNK_BLOCK_RATIO(bitmap) ((bitmap)->mddev->bitmap_info.chunksize >> BITMAP_BLOCK_SHIFT)
#define CHUNK_BLOCK_SHIFT(bitmap) ((bitmap)->chunkshift - BITMAP_BLOCK_SHIFT)
#endif
@ -178,7 +177,7 @@ struct bitmap {
struct mddev *mddev; /* the md device that the bitmap is for */
/* bitmap chunksize -- how much data does each bit represent? */
unsigned long chunkshift; /* chunksize = 2^chunkshift (for bitops) */
unsigned long chunkshift; /* chunksize = 2^(chunkshift+9) (for bitops) */
unsigned long chunks; /* total number of data chunks for the array */
__u64 events_cleared;