* [PATCH v2] xfs_bmap_util: use swap macro
@ 2018-07-09 21:02 Gustavo A. R. Silva
2018-07-11 17:44 ` Darrick J. Wong
0 siblings, 1 reply; 2+ messages in thread
From: Gustavo A. R. Silva @ 2018-07-09 21:02 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>
---
Changes in v2
- Use swap in a couple more of places.
fs/xfs/xfs_bmap_util.c | 28 +++++-----------------------
1 file changed, 5 insertions(+), 23 deletions(-)
diff --git a/fs/xfs/xfs_bmap_util.c b/fs/xfs/xfs_bmap_util.c
index 83b1e8c..a657d0a 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
@@ -1746,13 +1741,8 @@ xfs_swap_extent_forks(
ip->i_d.di_nblocks = tip->i_d.di_nblocks - taforkblks + aforkblks;
tip->i_d.di_nblocks = tmp + taforkblks - aforkblks;
- tmp = (uint64_t) ip->i_d.di_nextents;
- ip->i_d.di_nextents = tip->i_d.di_nextents;
- tip->i_d.di_nextents = tmp;
-
- tmp = (uint64_t) ip->i_d.di_format;
- ip->i_d.di_format = tip->i_d.di_format;
- tip->i_d.di_format = tmp;
+ swap(ip->i_d.di_nextents, tip->i_d.di_nextents);
+ swap(ip->i_d.di_format, tip->i_d.di_format);
/*
* The extents in the source inode could still contain speculative
@@ -1846,7 +1836,6 @@ xfs_swap_extents(
int src_log_flags, target_log_flags;
int error = 0;
int lock_flags;
- struct xfs_ifork *cowfp;
uint64_t f;
int resblks = 0;
@@ -1987,18 +1976,11 @@ 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;
-
- cowfp = ip->i_cowfp;
- ip->i_cowfp = tip->i_cowfp;
- tip->i_cowfp = cowfp;
+ swap(ip->i_cnextents, tip->i_cnextents);
+ swap(ip->i_cowfp, tip->i_cowfp);
if (ip->i_cowfp && ip->i_cowfp->if_bytes)
xfs_inode_set_cowblocks_tag(ip);
--
2.7.4
^ permalink raw reply related [flat|nested] 2+ messages in thread* Re: [PATCH v2] xfs_bmap_util: use swap macro
2018-07-09 21:02 [PATCH v2] xfs_bmap_util: use swap macro Gustavo A. R. Silva
@ 2018-07-11 17:44 ` Darrick J. Wong
0 siblings, 0 replies; 2+ messages in thread
From: Darrick J. Wong @ 2018-07-11 17:44 UTC (permalink / raw)
To: Gustavo A. R. Silva; +Cc: linux-xfs, linux-kernel
On Mon, Jul 09, 2018 at 04:02:59PM -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>
Looks ok, will test...
Reviewed-by: Darrick J. Wong <darrick.wong@oracle.com>
--D
> ---
> Changes in v2
> - Use swap in a couple more of places.
>
> fs/xfs/xfs_bmap_util.c | 28 +++++-----------------------
> 1 file changed, 5 insertions(+), 23 deletions(-)
>
> diff --git a/fs/xfs/xfs_bmap_util.c b/fs/xfs/xfs_bmap_util.c
> index 83b1e8c..a657d0a 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
> @@ -1746,13 +1741,8 @@ xfs_swap_extent_forks(
> ip->i_d.di_nblocks = tip->i_d.di_nblocks - taforkblks + aforkblks;
> tip->i_d.di_nblocks = tmp + taforkblks - aforkblks;
>
> - tmp = (uint64_t) ip->i_d.di_nextents;
> - ip->i_d.di_nextents = tip->i_d.di_nextents;
> - tip->i_d.di_nextents = tmp;
> -
> - tmp = (uint64_t) ip->i_d.di_format;
> - ip->i_d.di_format = tip->i_d.di_format;
> - tip->i_d.di_format = tmp;
> + swap(ip->i_d.di_nextents, tip->i_d.di_nextents);
> + swap(ip->i_d.di_format, tip->i_d.di_format);
>
> /*
> * The extents in the source inode could still contain speculative
> @@ -1846,7 +1836,6 @@ xfs_swap_extents(
> int src_log_flags, target_log_flags;
> int error = 0;
> int lock_flags;
> - struct xfs_ifork *cowfp;
> uint64_t f;
> int resblks = 0;
>
> @@ -1987,18 +1976,11 @@ 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;
> -
> - cowfp = ip->i_cowfp;
> - ip->i_cowfp = tip->i_cowfp;
> - tip->i_cowfp = cowfp;
> + swap(ip->i_cnextents, tip->i_cnextents);
> + swap(ip->i_cowfp, tip->i_cowfp);
>
> if (ip->i_cowfp && ip->i_cowfp->if_bytes)
> xfs_inode_set_cowblocks_tag(ip);
> --
> 2.7.4
>
> --
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