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| author | Akinobu Mita <akinobu.mita@gmail.com> | 2011-12-28 20:32:07 -0500 |
|---|---|---|
| committer | Theodore Ts'o <tytso@mit.edu> | 2011-12-28 20:32:07 -0500 |
| commit | 597d508c17a6dcd17770f4dd9da873d93cc15493 (patch) | |
| tree | e977644fd79c2f73bd90b78c08075cb53cc65196 | |
| parent | ccb4d7af914e0fe9b2f1022f8ea6c300463fd5e6 (diff) | |
| download | linux-3.10-597d508c17a6dcd17770f4dd9da873d93cc15493.tar.gz linux-3.10-597d508c17a6dcd17770f4dd9da873d93cc15493.tar.bz2 linux-3.10-597d508c17a6dcd17770f4dd9da873d93cc15493.zip | |
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>
| -rw-r--r-- | fs/ext4/ext4.h | 7 | ||||
| -rw-r--r-- | 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 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; |