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 <akinobu.mita@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>

2 files changed, 6 insertions, 5 deletions

diff --git a/fs/ext4/ext4.h b/fs/ext4/ext4.h
index ae2407f4502..0e43bba049a 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 cdafc05d79c..72fc9892231 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;