linux-ext4 - Re: [PATCH -V3 08/11] ext4: Signed arithematic fix

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Date:	Thu, 28 Aug 2008 14:04:11 -0700
From:	Mingming Cao <cmm@...ibm.com>
To:	"Aneesh Kumar K.V" <aneesh.kumar@...ux.vnet.ibm.com>
Cc:	tytso@....edu, sandeen@...hat.com, linux-ext4@...r.kernel.org
Subject: Re: [PATCH -V3 08/11] ext4: Signed arithematic fix


在 2008-08-27三的 20:58 +0530，Aneesh Kumar K.V写道：
> This patch converts some usage of ext4_fsblk_t to s64
> This is needed so that some of the sign conversion works
> as expected in if loops.
> 
> Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@...ux.vnet.ibm.com>

Reviewed-by: Mingming Cao <cmm@...ibm.com>
Added to patch queue
> ---
>  fs/ext4/balloc.c |   19 ++++++++++---------
>  fs/ext4/ext4.h   |    4 ++--
>  2 files changed, 12 insertions(+), 11 deletions(-)
> 
> diff --git a/fs/ext4/balloc.c b/fs/ext4/balloc.c
> index 53fdb05..7fdc236 100644
> --- a/fs/ext4/balloc.c
> +++ b/fs/ext4/balloc.c
> @@ -1603,10 +1603,10 @@ ext4_try_to_allocate_with_rsv(struct super_block *sb, handle_t *handle,
>  }
> 
>  int ext4_claim_free_blocks(struct ext4_sb_info *sbi,
> -						ext4_fsblk_t nblocks)
> +						s64 nblocks)
>  {
>  	s64 free_blocks, dirty_blocks;
> -	ext4_fsblk_t root_blocks = 0;
> +	s64 root_blocks = 0;
>  	struct percpu_counter *fbc = &sbi->s_freeblocks_counter;
>  	struct percpu_counter *dbc = &sbi->s_dirtyblocks_counter;
> 
> @@ -1631,7 +1631,7 @@ int ext4_claim_free_blocks(struct ext4_sb_info *sbi,
>  	/* Check whether we have space after
>  	 * accounting for current dirty blocks
>  	 */
> -	if (free_blocks < ((s64)(root_blocks + nblocks) + dirty_blocks))
> +	if (free_blocks < ((root_blocks + nblocks) + dirty_blocks))
>  		/* we don't have free space */
>  		return -ENOSPC;
> 
> @@ -1650,10 +1650,10 @@ int ext4_claim_free_blocks(struct ext4_sb_info *sbi,
>   * On success, return nblocks
>   */
>  ext4_fsblk_t ext4_has_free_blocks(struct ext4_sb_info *sbi,
> -						ext4_fsblk_t nblocks)
> +						s64 nblocks)
>  {
> -	ext4_fsblk_t free_blocks, dirty_blocks;
> -	ext4_fsblk_t root_blocks = 0;
> +	s64 free_blocks, dirty_blocks;
> +	s64 root_blocks = 0;
>  	struct percpu_counter *fbc = &sbi->s_freeblocks_counter;
>  	struct percpu_counter *dbc = &sbi->s_dirtyblocks_counter;
> 
> @@ -1667,14 +1667,15 @@ ext4_fsblk_t ext4_has_free_blocks(struct ext4_sb_info *sbi,
> 
>  	if (free_blocks - (nblocks + root_blocks + dirty_blocks) <
>  						EXT4_FREEBLOCKS_WATERMARK) {
> -		free_blocks  = percpu_counter_sum_positive(fbc);
> -		dirty_blocks = percpu_counter_sum_positive(dbc);
> +		free_blocks  = percpu_counter_sum(fbc);
> +		dirty_blocks = percpu_counter_sum(dbc);
>  	}
>  	if (free_blocks <= (root_blocks + dirty_blocks))
>  		/* we don't have free space */
>  		return 0;
> +
>  	if (free_blocks - (root_blocks + dirty_blocks) < nblocks)
> -		return free_blocks - root_blocks;
> +		return free_blocks - (root_blocks + dirty_blocks);
>  	return nblocks;
>  }
> 
> diff --git a/fs/ext4/ext4.h b/fs/ext4/ext4.h
> index 71a4fde..13c69ed 100644
> --- a/fs/ext4/ext4.h
> +++ b/fs/ext4/ext4.h
> @@ -1048,9 +1048,9 @@ extern ext4_fsblk_t ext4_new_blocks(handle_t *handle, struct inode *inode,
>  extern ext4_fsblk_t ext4_old_new_blocks(handle_t *handle, struct inode *inode,
>  			ext4_fsblk_t goal, unsigned long *count, int *errp);
>  extern int ext4_claim_free_blocks(struct ext4_sb_info *sbi,
> -						ext4_fsblk_t nblocks);
> +						s64 nblocks);
>  extern ext4_fsblk_t ext4_has_free_blocks(struct ext4_sb_info *sbi,
> -						ext4_fsblk_t nblocks);
> +						s64  nblocks);
>  extern void ext4_free_blocks (handle_t *handle, struct inode *inode,
>  			ext4_fsblk_t block, unsigned long count, int metadata);
>  extern void ext4_free_blocks_sb (handle_t *handle, struct super_block *sb,

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