linux-ext4 - Re: [PATCH] ext4: Fix 64-bit block type problem on 32-bit platforms

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Date:	Sun, 14 Jun 2009 23:07:10 -0500
From:	Eric Sandeen <sandeen@...hat.com>
To:	"Theodore Ts'o" <tytso@....edu>
CC:	Ext4 Developers List <linux-ext4@...r.kernel.org>
Subject: Re: [PATCH] ext4: Fix 64-bit block type problem on 32-bit platforms

Theodore Ts'o wrote:
> The function ext4_mb_free_blocks() was using an "unsigned long" to
> pass a block number; this will cause 64-bit block numbers to get
> truncated on x86 and other 32-bit platforms.
> 
> Signed-off-by: "Theodore Ts'o" <tytso@....edu>

Yup, good catch.

Reviewed-by: Eric Sandeen <sandeen@...hat.com>

> ---
>  fs/ext4/ext4.h    |    2 +-
>  fs/ext4/mballoc.c |    8 ++++----
>  2 files changed, 5 insertions(+), 5 deletions(-)
> 
> diff --git a/fs/ext4/ext4.h b/fs/ext4/ext4.h
> index 746cdcb..17b9998 100644
> --- a/fs/ext4/ext4.h
> +++ b/fs/ext4/ext4.h
> @@ -1341,7 +1341,7 @@ extern void ext4_discard_preallocations(struct inode *);
>  extern int __init init_ext4_mballoc(void);
>  extern void exit_ext4_mballoc(void);
>  extern void ext4_mb_free_blocks(handle_t *, struct inode *,
> -		unsigned long, unsigned long, int, unsigned long *);
> +		ext4_fsblk_t, unsigned long, int, unsigned long *);
>  extern int ext4_mb_add_groupinfo(struct super_block *sb,
>  		ext4_group_t i, struct ext4_group_desc *desc);
>  extern void ext4_mb_update_group_info(struct ext4_group_info *grp,
> diff --git a/fs/ext4/mballoc.c b/fs/ext4/mballoc.c
> index 8d98070..519a0a6 100644
> --- a/fs/ext4/mballoc.c
> +++ b/fs/ext4/mballoc.c
> @@ -4689,7 +4689,7 @@ ext4_mb_free_metadata(handle_t *handle, struct ext4_buddy *e4b,
>   * Main entry point into mballoc to free blocks
>   */
>  void ext4_mb_free_blocks(handle_t *handle, struct inode *inode,
> -			unsigned long block, unsigned long count,
> +			ext4_fsblk_t block, unsigned long count,
>  			int metadata, unsigned long *freed)
>  {
>  	struct buffer_head *bitmap_bh = NULL;
> @@ -4715,11 +4715,11 @@ void ext4_mb_free_blocks(handle_t *handle, struct inode *inode,
>  	    block + count > ext4_blocks_count(es)) {
>  		ext4_error(sb, __func__,
>  			    "Freeing blocks not in datazone - "
> -			    "block = %lu, count = %lu", block, count);
> +			    "block = %llu, count = %lu", block, count);
>  		goto error_return;
>  	}
>  
> -	ext4_debug("freeing block %lu\n", block);
> +	ext4_debug("freeing block %llu\n", block);
>  	trace_ext4_free_blocks(inode, block, count, metadata);
>  
>  	ac = kmem_cache_alloc(ext4_ac_cachep, GFP_NOFS);
> @@ -4761,7 +4761,7 @@ do_more:
>  
>  		ext4_error(sb, __func__,
>  			   "Freeing blocks in system zone - "
> -			   "Block = %lu, count = %lu", block, count);
> +			   "Block = %llu, count = %lu", block, count);
>  		/* err = 0. ext4_std_error should be a no op */
>  		goto error_return;
>  	}

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