diff options
| author | Akinobu Mita <akinobu.mita@gmail.com> | 2012-07-31 01:40:57 +0400 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2012-07-31 04:25:16 +0400 |
| commit | 9b58f6d4aaef070bf6e0744713b6d2b6fc1b3578 (patch) | |
| tree | 67b220d36ae96abb0a4551d0ead65e3c0c599704 /fs | |
| parent | 639b9e34f15e4b2c30068a4e4485586af0cdf709 (diff) | |
| download | linux-9b58f6d4aaef070bf6e0744713b6d2b6fc1b3578.tar.xz | |
qnx4fs: use memweight()
Use memweight() to count the total number of bits clear in memory area.
Note that this memweight() call can't be replaced with a single
bitmap_weight() call, although the pointer to the memory area is aligned
to long-word boundary. Because the size of the memory area may not be a
multiple of BITS_PER_LONG, then it returns wrong value on big-endian
architecture.
Signed-off-by: Akinobu Mita <akinobu.mita@gmail.com>
Acked-by: Anders Larsen <al@alarsen.net>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'fs')
| -rw-r--r-- | fs/qnx4/bitmap.c | 24 |
1 files changed, 5 insertions, 19 deletions
diff --git a/fs/qnx4/bitmap.c b/fs/qnx4/bitmap.c index 22e0d60e53ef..76a7a697b778 100644 --- a/fs/qnx4/bitmap.c +++ b/fs/qnx4/bitmap.c @@ -17,23 +17,6 @@ #include <linux/bitops.h> #include "qnx4.h" -static void count_bits(register const char *bmPart, register int size, - int *const tf) -{ - char b; - int tot = *tf; - - if (size > QNX4_BLOCK_SIZE) { - size = QNX4_BLOCK_SIZE; - } - do { - b = *bmPart++; - tot += 8 - hweight8(b); - size--; - } while (size != 0); - *tf = tot; -} - unsigned long qnx4_count_free_blocks(struct super_block *sb) { int start = le32_to_cpu(qnx4_sb(sb)->BitMap->di_first_xtnt.xtnt_blk) - 1; @@ -44,13 +27,16 @@ unsigned long qnx4_count_free_blocks(struct super_block *sb) struct buffer_head *bh; while (total < size) { + int bytes = min(size - total, QNX4_BLOCK_SIZE); + if ((bh = sb_bread(sb, start + offset)) == NULL) { printk(KERN_ERR "qnx4: I/O error in counting free blocks\n"); break; } - count_bits(bh->b_data, size - total, &total_free); + total_free += bytes * BITS_PER_BYTE - + memweight(bh->b_data, bytes); brelse(bh); - total += QNX4_BLOCK_SIZE; + total += bytes; offset++; } |