From b170a21ab02e246f9c3c9fa4b56d2f7011d0f3b8 Mon Sep 17 00:00:00 2001 From: Akinobu Mita Date: Thu, 8 Dec 2011 15:33:17 +1100 Subject: [PATCH] ext4: use proper little-endian bitops ext4_{set,clear}_bit() is defined as __test_and_{set,clear}_bit_le() for ext4. Only two ext4_{set,clear}_bit() calls check the return value. The rest of calls ignore the return value and they can be replaced with __{set,clear}_bit_le(). This changes ext4_{set,clear}_bit() from __test_and_{set,clear}_bit_le() to __{set,clear}_bit_le() and introduces ext4_test_and_{set,clear}_bit() for the two places where old bit needs to be returned. This ext4_{set,clear}_bit() change is considered safe, because if someone uses these macros without noticing the change, new ext4_{set,clear}_bit don't have return value and causes compiler errors where the return value is used. This also removes unused ext4_find_first_zero_bit(). Signed-off-by: Akinobu Mita Cc: "Theodore Ts'o" Cc: Andreas Dilger Signed-off-by: Andrew Morton --- fs/ext4/ext4.h | 7 ++++--- fs/ext4/ialloc.c | 4 ++-- 2 files changed, 6 insertions(+), 5 deletions(-) diff --git a/fs/ext4/ext4.h b/fs/ext4/ext4.h index 5b0e26a1272d..41c9ef17acf8 100644 --- a/fs/ext4/ext4.h +++ b/fs/ext4/ext4.h @@ -957,12 +957,13 @@ struct ext4_inode_info { #define test_opt2(sb, opt) (EXT4_SB(sb)->s_mount_opt2 & \ EXT4_MOUNT2_##opt) -#define ext4_set_bit __test_and_set_bit_le +#define ext4_test_and_set_bit __test_and_set_bit_le +#define ext4_set_bit __set_bit_le #define ext4_set_bit_atomic ext2_set_bit_atomic -#define ext4_clear_bit __test_and_clear_bit_le +#define ext4_test_and_clear_bit __test_and_clear_bit_le +#define ext4_clear_bit __clear_bit_le #define ext4_clear_bit_atomic ext2_clear_bit_atomic #define ext4_test_bit test_bit_le -#define ext4_find_first_zero_bit find_first_zero_bit_le #define ext4_find_next_zero_bit find_next_zero_bit_le #define ext4_find_next_bit find_next_bit_le diff --git a/fs/ext4/ialloc.c b/fs/ext4/ialloc.c index 00beb4f9cc4f..e4f356f0780d 100644 --- a/fs/ext4/ialloc.c +++ b/fs/ext4/ialloc.c @@ -252,7 +252,7 @@ void ext4_free_inode(handle_t *handle, struct inode *inode) fatal = ext4_journal_get_write_access(handle, bh2); } ext4_lock_group(sb, block_group); - cleared = ext4_clear_bit(bit, bitmap_bh->b_data); + cleared = ext4_test_and_clear_bit(bit, bitmap_bh->b_data); if (fatal || !cleared) { ext4_unlock_group(sb, block_group); goto out; @@ -618,7 +618,7 @@ static int ext4_claim_inode(struct super_block *sb, */ down_read(&grp->alloc_sem); ext4_lock_group(sb, group); - if (ext4_set_bit(ino, inode_bitmap_bh->b_data)) { + if (ext4_test_and_set_bit(ino, inode_bitmap_bh->b_data)) { /* not a free inode */ retval = 1; goto err_ret; -- 2.39.5