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Date: Mon, 30 May 2011 16:57:33 +0200
From: Jan Kara <jack@...e.cz>
To: Akinobu Mita <akinobu.mita@...il.com>
Cc: linux-kernel@...r.kernel.org, Jan Kara <jack@...e.cz>,
Andrew Morton <akpm@...ux-foundation.org>,
Andreas Dilger <adilger.kernel@...ger.ca>,
linux-ext4@...r.kernel.org
Subject: Re: [PATCH 1/2] ext3: use little-endian bitops directly
On Mon 30-05-11 22:47:15, Akinobu Mita wrote:
> s/ext3_set_bit/__test_and_set_bit_le/
> s/ext3_clear_bit/__test_and_clear_bit_le/
> s/ext3_test_bit/test_bit_le/
> s/ext3_find_first_zero_bit/find_first_zero_bit_le/
> s/ext3_find_next_zero_bit/find_next_zero_bit_le/
>
> This change reveals that there are some __test_and_{set,clear}_bit_le()
> calls which ignore the return value. These can be replaced with
> __{set,clear}_bit_le().
OK, after some though this is probably an improvement in readability.
Added to my tree.
Honza
>
> Signed-off-by: Akinobu Mita <akinobu.mita@...il.com>
> Cc: Jan Kara <jack@...e.cz>
> Cc: Andrew Morton <akpm@...ux-foundation.org>
> Cc: Andreas Dilger <adilger.kernel@...ger.ca>
> Cc: linux-ext4@...r.kernel.org
> ---
> fs/ext3/balloc.c | 20 ++++++++++----------
> fs/ext3/ialloc.c | 8 ++++----
> fs/ext3/inode.c | 2 +-
> fs/ext3/resize.c | 14 +++++++-------
> include/linux/ext3_fs.h | 5 -----
> 5 files changed, 22 insertions(+), 27 deletions(-)
>
> diff --git a/fs/ext3/balloc.c b/fs/ext3/balloc.c
> index fe52297..8365b3d 100644
> --- a/fs/ext3/balloc.c
> +++ b/fs/ext3/balloc.c
> @@ -112,21 +112,21 @@ static int ext3_valid_block_bitmap(struct super_block *sb,
> /* check whether block bitmap block number is set */
> bitmap_blk = le32_to_cpu(desc->bg_block_bitmap);
> offset = bitmap_blk - group_first_block;
> - if (!ext3_test_bit(offset, bh->b_data))
> + if (!test_bit_le(offset, bh->b_data))
> /* bad block bitmap */
> goto err_out;
>
> /* check whether the inode bitmap block number is set */
> bitmap_blk = le32_to_cpu(desc->bg_inode_bitmap);
> offset = bitmap_blk - group_first_block;
> - if (!ext3_test_bit(offset, bh->b_data))
> + if (!test_bit_le(offset, bh->b_data))
> /* bad block bitmap */
> goto err_out;
>
> /* check whether the inode table block number is set */
> bitmap_blk = le32_to_cpu(desc->bg_inode_table);
> offset = bitmap_blk - group_first_block;
> - next_zero_bit = ext3_find_next_zero_bit(bh->b_data,
> + next_zero_bit = find_next_zero_bit_le(bh->b_data,
> offset + EXT3_SB(sb)->s_itb_per_group,
> offset);
> if (next_zero_bit >= offset + EXT3_SB(sb)->s_itb_per_group)
> @@ -722,14 +722,14 @@ static int ext3_test_allocatable(ext3_grpblk_t nr, struct buffer_head *bh)
> int ret;
> struct journal_head *jh = bh2jh(bh);
>
> - if (ext3_test_bit(nr, bh->b_data))
> + if (test_bit_le(nr, bh->b_data))
> return 0;
>
> jbd_lock_bh_state(bh);
> if (!jh->b_committed_data)
> ret = 1;
> else
> - ret = !ext3_test_bit(nr, jh->b_committed_data);
> + ret = !test_bit_le(nr, jh->b_committed_data);
> jbd_unlock_bh_state(bh);
> return ret;
> }
> @@ -752,14 +752,14 @@ bitmap_search_next_usable_block(ext3_grpblk_t start, struct buffer_head *bh,
> struct journal_head *jh = bh2jh(bh);
>
> while (start < maxblocks) {
> - next = ext3_find_next_zero_bit(bh->b_data, maxblocks, start);
> + next = find_next_zero_bit_le(bh->b_data, maxblocks, start);
> if (next >= maxblocks)
> return -1;
> if (ext3_test_allocatable(next, bh))
> return next;
> jbd_lock_bh_state(bh);
> if (jh->b_committed_data)
> - start = ext3_find_next_zero_bit(jh->b_committed_data,
> + start = find_next_zero_bit_le(jh->b_committed_data,
> maxblocks, next);
> jbd_unlock_bh_state(bh);
> }
> @@ -798,7 +798,7 @@ find_next_usable_block(ext3_grpblk_t start, struct buffer_head *bh,
> ext3_grpblk_t end_goal = (start + 63) & ~63;
> if (end_goal > maxblocks)
> end_goal = maxblocks;
> - here = ext3_find_next_zero_bit(bh->b_data, end_goal, start);
> + here = find_next_zero_bit_le(bh->b_data, end_goal, start);
> if (here < end_goal && ext3_test_allocatable(here, bh))
> return here;
> ext3_debug("Bit not found near goal\n");
> @@ -845,7 +845,7 @@ claim_block(spinlock_t *lock, ext3_grpblk_t block, struct buffer_head *bh)
> if (ext3_set_bit_atomic(lock, block, bh->b_data))
> return 0;
> jbd_lock_bh_state(bh);
> - if (jh->b_committed_data && ext3_test_bit(block,jh->b_committed_data)) {
> + if (jh->b_committed_data && test_bit_le(block, jh->b_committed_data)) {
> ext3_clear_bit_atomic(lock, block, bh->b_data);
> ret = 0;
> } else {
> @@ -1697,7 +1697,7 @@ allocated:
> int i;
>
> for (i = 0; i < num; i++) {
> - if (ext3_test_bit(grp_alloc_blk+i,
> + if (test_bit_le(grp_alloc_blk + i,
> bh2jh(bitmap_bh)->b_committed_data)) {
> printk("%s: block was unexpectedly set in "
> "b_committed_data\n", __func__);
> diff --git a/fs/ext3/ialloc.c b/fs/ext3/ialloc.c
> index bfc2dc4..8796fbc 100644
> --- a/fs/ext3/ialloc.c
> +++ b/fs/ext3/ialloc.c
> @@ -460,7 +460,7 @@ struct inode *ext3_new_inode(handle_t *handle, struct inode * dir,
> ino = 0;
>
> repeat_in_this_group:
> - ino = ext3_find_next_zero_bit((unsigned long *)
> + ino = find_next_zero_bit_le(
> bitmap_bh->b_data, EXT3_INODES_PER_GROUP(sb), ino);
> if (ino < EXT3_INODES_PER_GROUP(sb)) {
>
> @@ -654,7 +654,7 @@ struct inode *ext3_orphan_get(struct super_block *sb, unsigned long ino)
> * is a valid orphan (no e2fsck run on fs). Orphans also include
> * inodes that were being truncated, so we can't check i_nlink==0.
> */
> - if (!ext3_test_bit(bit, bitmap_bh->b_data))
> + if (!test_bit_le(bit, bitmap_bh->b_data))
> goto bad_orphan;
>
> inode = ext3_iget(sb, ino);
> @@ -680,9 +680,9 @@ iget_failed:
> bad_orphan:
> ext3_warning(sb, __func__,
> "bad orphan inode %lu! e2fsck was run?", ino);
> - printk(KERN_NOTICE "ext3_test_bit(bit=%d, block=%llu) = %d\n",
> + printk(KERN_NOTICE "test_bit_le(bit=%d, block=%llu) = %d\n",
> bit, (unsigned long long)bitmap_bh->b_blocknr,
> - ext3_test_bit(bit, bitmap_bh->b_data));
> + test_bit_le(bit, bitmap_bh->b_data));
> printk(KERN_NOTICE "inode=%p\n", inode);
> if (inode) {
> printk(KERN_NOTICE "is_bad_inode(inode)=%d\n",
> diff --git a/fs/ext3/inode.c b/fs/ext3/inode.c
> index 3451d23..57432a6 100644
> --- a/fs/ext3/inode.c
> +++ b/fs/ext3/inode.c
> @@ -2727,7 +2727,7 @@ static int __ext3_get_inode_loc(struct inode *inode,
> for (i = start; i < start + inodes_per_buffer; i++) {
> if (i == inode_offset)
> continue;
> - if (ext3_test_bit(i, bitmap_bh->b_data))
> + if (test_bit_le(i, bitmap_bh->b_data))
> break;
> }
> brelse(bitmap_bh);
> diff --git a/fs/ext3/resize.c b/fs/ext3/resize.c
> index 7916e4c..213a794 100644
> --- a/fs/ext3/resize.c
> +++ b/fs/ext3/resize.c
> @@ -148,7 +148,7 @@ static void mark_bitmap_end(int start_bit, int end_bit, char *bitmap)
>
> ext3_debug("mark end bits +%d through +%d used\n", start_bit, end_bit);
> for (i = start_bit; i < ((start_bit + 7) & ~7UL); i++)
> - ext3_set_bit(i, bitmap);
> + __test_and_set_bit_le(i, bitmap);
> if (i < end_bit)
> memset(bitmap + (i >> 3), 0xff, (end_bit - i) >> 3);
> }
> @@ -222,7 +222,7 @@ static int setup_new_group_blocks(struct super_block *sb,
>
> if (ext3_bg_has_super(sb, input->group)) {
> ext3_debug("mark backup superblock %#04lx (+0)\n", start);
> - ext3_set_bit(0, bh->b_data);
> + __test_and_set_bit_le(0, bh->b_data);
> }
>
> /* Copy all of the GDT blocks into the backup in this group */
> @@ -254,7 +254,7 @@ static int setup_new_group_blocks(struct super_block *sb,
> brelse(gdb);
> goto exit_bh;
> }
> - ext3_set_bit(bit, bh->b_data);
> + __test_and_set_bit_le(bit, bh->b_data);
> brelse(gdb);
> }
>
> @@ -278,15 +278,15 @@ static int setup_new_group_blocks(struct super_block *sb,
> brelse(gdb);
> goto exit_bh;
> }
> - ext3_set_bit(bit, bh->b_data);
> + __test_and_set_bit_le(bit, bh->b_data);
> brelse(gdb);
> }
> ext3_debug("mark block bitmap %#04x (+%ld)\n", input->block_bitmap,
> input->block_bitmap - start);
> - ext3_set_bit(input->block_bitmap - start, bh->b_data);
> + __test_and_set_bit_le(input->block_bitmap - start, bh->b_data);
> ext3_debug("mark inode bitmap %#04x (+%ld)\n", input->inode_bitmap,
> input->inode_bitmap - start);
> - ext3_set_bit(input->inode_bitmap - start, bh->b_data);
> + __test_and_set_bit_le(input->inode_bitmap - start, bh->b_data);
>
> /* Zero out all of the inode table blocks */
> for (i = 0, block = input->inode_table, bit = block - start;
> @@ -309,7 +309,7 @@ static int setup_new_group_blocks(struct super_block *sb,
> goto exit_bh;
> }
> brelse(it);
> - ext3_set_bit(bit, bh->b_data);
> + __test_and_set_bit_le(bit, bh->b_data);
> }
>
> err = extend_or_restart_transaction(handle, 2, bh);
> diff --git a/include/linux/ext3_fs.h b/include/linux/ext3_fs.h
> index 5e06acf..6caadd0 100644
> --- a/include/linux/ext3_fs.h
> +++ b/include/linux/ext3_fs.h
> @@ -418,13 +418,8 @@ struct ext3_inode {
> #define EXT2_MOUNT_DATA_FLAGS EXT3_MOUNT_DATA_FLAGS
> #endif
>
> -#define ext3_set_bit __test_and_set_bit_le
> #define ext3_set_bit_atomic ext2_set_bit_atomic
> -#define ext3_clear_bit __test_and_clear_bit_le
> #define ext3_clear_bit_atomic ext2_clear_bit_atomic
> -#define ext3_test_bit test_bit_le
> -#define ext3_find_first_zero_bit find_first_zero_bit_le
> -#define ext3_find_next_zero_bit find_next_zero_bit_le
>
> /*
> * Maximal mount counts between two filesystem checks
> --
> 1.7.4.4
>
--
Jan Kara <jack@...e.cz>
SUSE Labs, CR
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