* [PATCH] xfs_bmap_util: use swap macro
@ 2018-07-09 14:05 Gustavo A. R. Silva
2018-07-09 16:39 ` Darrick J. Wong
0 siblings, 1 reply; 3+ messages in thread
From: Gustavo A. R. Silva @ 2018-07-09 14:05 UTC (permalink / raw)
To: Darrick J. Wong; +Cc: linux-xfs, linux-kernel, Gustavo A. R. Silva
Make use of the swap macro and remove some unnecessary variables.
This makes the code easier to read and maintain. Also, reduces the
stack usage.
This code was detected with the help of Coccinelle.
Signed-off-by: Gustavo A. R. Silva <gustavo@embeddedor.com>
---
fs/xfs/xfs_bmap_util.c | 13 ++-----------
1 file changed, 2 insertions(+), 11 deletions(-)
diff --git a/fs/xfs/xfs_bmap_util.c b/fs/xfs/xfs_bmap_util.c
index 83b1e8c..4b0b16f 100644
--- a/fs/xfs/xfs_bmap_util.c
+++ b/fs/xfs/xfs_bmap_util.c
@@ -1691,7 +1691,6 @@ xfs_swap_extent_forks(
int *src_log_flags,
int *target_log_flags)
{
- struct xfs_ifork tempifp, *ifp, *tifp;
xfs_filblks_t aforkblks = 0;
xfs_filblks_t taforkblks = 0;
xfs_extnum_t junk;
@@ -1733,11 +1732,7 @@ xfs_swap_extent_forks(
/*
* Swap the data forks of the inodes
*/
- ifp = &ip->i_df;
- tifp = &tip->i_df;
- tempifp = *ifp; /* struct copy */
- *ifp = *tifp; /* struct copy */
- *tifp = tempifp; /* struct copy */
+ swap(ip->i_df, tip->i_df);
/*
* Fix the on-disk inode values
@@ -1987,14 +1982,10 @@ xfs_swap_extents(
/* Swap the cow forks. */
if (xfs_sb_version_hasreflink(&mp->m_sb)) {
- xfs_extnum_t extnum;
-
ASSERT(ip->i_cformat == XFS_DINODE_FMT_EXTENTS);
ASSERT(tip->i_cformat == XFS_DINODE_FMT_EXTENTS);
- extnum = ip->i_cnextents;
- ip->i_cnextents = tip->i_cnextents;
- tip->i_cnextents = extnum;
+ swap(ip->i_cnextents, tip->i_cnextents);
cowfp = ip->i_cowfp;
ip->i_cowfp = tip->i_cowfp;
--
2.7.4
^ permalink raw reply related [flat|nested] 3+ messages in thread* Re: [PATCH] xfs_bmap_util: use swap macro
2018-07-09 14:05 [PATCH] xfs_bmap_util: use swap macro Gustavo A. R. Silva
@ 2018-07-09 16:39 ` Darrick J. Wong
2018-07-09 16:42 ` Gustavo A. R. Silva
0 siblings, 1 reply; 3+ messages in thread
From: Darrick J. Wong @ 2018-07-09 16:39 UTC (permalink / raw)
To: Gustavo A. R. Silva; +Cc: linux-xfs, linux-kernel
On Mon, Jul 09, 2018 at 09:05:39AM -0500, Gustavo A. R. Silva wrote:
> Make use of the swap macro and remove some unnecessary variables.
> This makes the code easier to read and maintain. Also, reduces the
> stack usage.
>
> This code was detected with the help of Coccinelle.
>
> Signed-off-by: Gustavo A. R. Silva <gustavo@embeddedor.com>
> ---
> fs/xfs/xfs_bmap_util.c | 13 ++-----------
> 1 file changed, 2 insertions(+), 11 deletions(-)
>
> diff --git a/fs/xfs/xfs_bmap_util.c b/fs/xfs/xfs_bmap_util.c
> index 83b1e8c..4b0b16f 100644
> --- a/fs/xfs/xfs_bmap_util.c
> +++ b/fs/xfs/xfs_bmap_util.c
> @@ -1691,7 +1691,6 @@ xfs_swap_extent_forks(
> int *src_log_flags,
> int *target_log_flags)
> {
> - struct xfs_ifork tempifp, *ifp, *tifp;
> xfs_filblks_t aforkblks = 0;
> xfs_filblks_t taforkblks = 0;
> xfs_extnum_t junk;
> @@ -1733,11 +1732,7 @@ xfs_swap_extent_forks(
> /*
> * Swap the data forks of the inodes
> */
> - ifp = &ip->i_df;
> - tifp = &tip->i_df;
> - tempifp = *ifp; /* struct copy */
> - *ifp = *tifp; /* struct copy */
> - *tifp = tempifp; /* struct copy */
> + swap(ip->i_df, tip->i_df);
>
> /*
> * Fix the on-disk inode values
Why not use swap() on the di_nextents and di_format exchange below here
too?
> @@ -1987,14 +1982,10 @@ xfs_swap_extents(
>
> /* Swap the cow forks. */
> if (xfs_sb_version_hasreflink(&mp->m_sb)) {
> - xfs_extnum_t extnum;
> -
> ASSERT(ip->i_cformat == XFS_DINODE_FMT_EXTENTS);
> ASSERT(tip->i_cformat == XFS_DINODE_FMT_EXTENTS);
>
> - extnum = ip->i_cnextents;
> - ip->i_cnextents = tip->i_cnextents;
> - tip->i_cnextents = extnum;
> + swap(ip->i_cnextents, tip->i_cnextents);
>
> cowfp = ip->i_cowfp;
> ip->i_cowfp = tip->i_cowfp;
Same here -- why not use swap on {ip,tip}->i_cowfp?
--D
> --
> 2.7.4
>
> --
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^ permalink raw reply [flat|nested] 3+ messages in thread* Re: [PATCH] xfs_bmap_util: use swap macro
2018-07-09 16:39 ` Darrick J. Wong
@ 2018-07-09 16:42 ` Gustavo A. R. Silva
0 siblings, 0 replies; 3+ messages in thread
From: Gustavo A. R. Silva @ 2018-07-09 16:42 UTC (permalink / raw)
To: Darrick J. Wong; +Cc: linux-xfs, linux-kernel
Hi Darrick,
On 07/09/2018 11:39 AM, Darrick J. Wong wrote:
> On Mon, Jul 09, 2018 at 09:05:39AM -0500, Gustavo A. R. Silva wrote:
>> Make use of the swap macro and remove some unnecessary variables.
>> This makes the code easier to read and maintain. Also, reduces the
>> stack usage.
>>
>> This code was detected with the help of Coccinelle.
>>
>> Signed-off-by: Gustavo A. R. Silva <gustavo@embeddedor.com>
>> ---
>> fs/xfs/xfs_bmap_util.c | 13 ++-----------
>> 1 file changed, 2 insertions(+), 11 deletions(-)
>>
>> diff --git a/fs/xfs/xfs_bmap_util.c b/fs/xfs/xfs_bmap_util.c
>> index 83b1e8c..4b0b16f 100644
>> --- a/fs/xfs/xfs_bmap_util.c
>> +++ b/fs/xfs/xfs_bmap_util.c
>> @@ -1691,7 +1691,6 @@ xfs_swap_extent_forks(
>> int *src_log_flags,
>> int *target_log_flags)
>> {
>> - struct xfs_ifork tempifp, *ifp, *tifp;
>> xfs_filblks_t aforkblks = 0;
>> xfs_filblks_t taforkblks = 0;
>> xfs_extnum_t junk;
>> @@ -1733,11 +1732,7 @@ xfs_swap_extent_forks(
>> /*
>> * Swap the data forks of the inodes
>> */
>> - ifp = &ip->i_df;
>> - tifp = &tip->i_df;
>> - tempifp = *ifp; /* struct copy */
>> - *ifp = *tifp; /* struct copy */
>> - *tifp = tempifp; /* struct copy */
>> + swap(ip->i_df, tip->i_df);
>>
>> /*
>> * Fix the on-disk inode values
>
> Why not use swap() on the di_nextents and di_format exchange below here
> too?
>
>> @@ -1987,14 +1982,10 @@ xfs_swap_extents(
>>
>> /* Swap the cow forks. */
>> if (xfs_sb_version_hasreflink(&mp->m_sb)) {
>> - xfs_extnum_t extnum;
>> -
>> ASSERT(ip->i_cformat == XFS_DINODE_FMT_EXTENTS);
>> ASSERT(tip->i_cformat == XFS_DINODE_FMT_EXTENTS);
>>
>> - extnum = ip->i_cnextents;
>> - ip->i_cnextents = tip->i_cnextents;
>> - tip->i_cnextents = extnum;
>> + swap(ip->i_cnextents, tip->i_cnextents);
>>
>> cowfp = ip->i_cowfp;
>> ip->i_cowfp = tip->i_cowfp;
>
> Same here -- why not use swap on {ip,tip}->i_cowfp?
>
Yep. I'll send a new patch shortly.
Thanks for the feedback.
--
Gustavo
^ permalink raw reply [flat|nested] 3+ messages in thread
end of thread, other threads:[~2018-07-09 17:05 UTC | newest]
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2018-07-09 14:05 [PATCH] xfs_bmap_util: use swap macro Gustavo A. R. Silva
2018-07-09 16:39 ` Darrick J. Wong
2018-07-09 16:42 ` Gustavo A. R. Silva
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