diff mbox series

[2/4] xfs: merge the perag freeing helpers

Message ID 20240910042855.3480387-3-hch@lst.de (mailing list archive)
State New
Headers show
Series [1/4] xfs: pass the exact range to initialize to xfs_initialize_perag | expand

Commit Message

Christoph Hellwig Sept. 10, 2024, 4:28 a.m. UTC 
There is no good reason to have two different routines for freeing perag
structures for the unmount and error cases.  Add two arguments to specify
the range of AGs to free to xfs_free_perag, and use that to replace
xfs_free_unused_perag_range.

The addition RCU grace period for the error case is harmless, and the
extra check for the AG to actually exist is not required now that the
callers pass the exact known allocated range.

Signed-off-by: Christoph Hellwig <hch@lst.de>
---
 fs/xfs/libxfs/xfs_ag.c | 40 ++++++++++------------------------------
 fs/xfs/libxfs/xfs_ag.h |  5 ++---
 fs/xfs/xfs_fsops.c     |  2 +-
 fs/xfs/xfs_mount.c     |  5 ++---
 4 files changed, 15 insertions(+), 37 deletions(-)

Comments

Darrick J. Wong Sept. 17, 2024, 6:55 p.m. UTC | #1 
On Tue, Sep 10, 2024 at 07:28:45AM +0300, Christoph Hellwig wrote:
> There is no good reason to have two different routines for freeing perag
> structures for the unmount and error cases.  Add two arguments to specify
> the range of AGs to free to xfs_free_perag, and use that to replace
> xfs_free_unused_perag_range.
> 
> The addition RCU grace period for the error case is harmless, and the
> extra check for the AG to actually exist is not required now that the
> callers pass the exact known allocated range.

And I guess the extra xfs_perag_rele is ok because xfs_initialize_perag
sets it to 1 and the _unused free function didn't care what the active
refcount was?

If the answer is yes then I've understood this enough to say
Reviewed-by: Darrick J. Wong <djwong@kernel.org>

--D


> Signed-off-by: Christoph Hellwig <hch@lst.de>
> ---
>  fs/xfs/libxfs/xfs_ag.c | 40 ++++++++++------------------------------
>  fs/xfs/libxfs/xfs_ag.h |  5 ++---
>  fs/xfs/xfs_fsops.c     |  2 +-
>  fs/xfs/xfs_mount.c     |  5 ++---
>  4 files changed, 15 insertions(+), 37 deletions(-)
> 
> diff --git a/fs/xfs/libxfs/xfs_ag.c b/fs/xfs/libxfs/xfs_ag.c
> index 5186735da5d45a..3f695100d7ab58 100644
> --- a/fs/xfs/libxfs/xfs_ag.c
> +++ b/fs/xfs/libxfs/xfs_ag.c
> @@ -185,17 +185,20 @@ xfs_initialize_perag_data(
>  }
>  
>  /*
> - * Free up the per-ag resources associated with the mount structure.
> + * Free up the per-ag resources  within the specified AG range.
>   */
>  void
> -xfs_free_perag(
> -	struct xfs_mount	*mp)
> +xfs_free_perag_range(
> +	struct xfs_mount	*mp,
> +	xfs_agnumber_t		first_agno,
> +	xfs_agnumber_t		end_agno)
> +
>  {
> -	struct xfs_perag	*pag;
>  	xfs_agnumber_t		agno;
>  
> -	for (agno = 0; agno < mp->m_sb.sb_agcount; agno++) {
> -		pag = xa_erase(&mp->m_perags, agno);
> +	for (agno = first_agno; agno < end_agno; agno++) {
> +		struct xfs_perag	*pag = xa_erase(&mp->m_perags, agno);
> +
>  		ASSERT(pag);
>  		XFS_IS_CORRUPT(pag->pag_mount, atomic_read(&pag->pag_ref) != 0);
>  		xfs_defer_drain_free(&pag->pag_intents_drain);
> @@ -270,29 +273,6 @@ xfs_agino_range(
>  	return __xfs_agino_range(mp, xfs_ag_block_count(mp, agno), first, last);
>  }
>  
> -/*
> - * Free perag within the specified AG range, it is only used to free unused
> - * perags under the error handling path.
> - */
> -void
> -xfs_free_unused_perag_range(
> -	struct xfs_mount	*mp,
> -	xfs_agnumber_t		agstart,
> -	xfs_agnumber_t		agend)
> -{
> -	struct xfs_perag	*pag;
> -	xfs_agnumber_t		index;
> -
> -	for (index = agstart; index < agend; index++) {
> -		pag = xa_erase(&mp->m_perags, index);
> -		if (!pag)
> -			break;
> -		xfs_buf_cache_destroy(&pag->pag_bcache);
> -		xfs_defer_drain_free(&pag->pag_intents_drain);
> -		kfree(pag);
> -	}
> -}
> -
>  int
>  xfs_initialize_perag(
>  	struct xfs_mount	*mp,
> @@ -369,7 +349,7 @@ xfs_initialize_perag(
>  out_free_pag:
>  	kfree(pag);
>  out_unwind_new_pags:
> -	xfs_free_unused_perag_range(mp, old_agcount, index);
> +	xfs_free_perag_range(mp, old_agcount, index);
>  	return error;
>  }
>  
> diff --git a/fs/xfs/libxfs/xfs_ag.h b/fs/xfs/libxfs/xfs_ag.h
> index 69fc31e7b84728..6e68d6a3161a0f 100644
> --- a/fs/xfs/libxfs/xfs_ag.h
> +++ b/fs/xfs/libxfs/xfs_ag.h
> @@ -144,13 +144,12 @@ __XFS_AG_OPSTATE(prefers_metadata, PREFERS_METADATA)
>  __XFS_AG_OPSTATE(allows_inodes, ALLOWS_INODES)
>  __XFS_AG_OPSTATE(agfl_needs_reset, AGFL_NEEDS_RESET)
>  
> -void xfs_free_unused_perag_range(struct xfs_mount *mp, xfs_agnumber_t agstart,
> -			xfs_agnumber_t agend);
>  int xfs_initialize_perag(struct xfs_mount *mp, xfs_agnumber_t old_agcount,
>  		xfs_agnumber_t agcount, xfs_rfsblock_t dcount,
>  		xfs_agnumber_t *maxagi);
> +void xfs_free_perag_range(struct xfs_mount *mp, xfs_agnumber_t first_agno,
> +		xfs_agnumber_t end_agno);
>  int xfs_initialize_perag_data(struct xfs_mount *mp, xfs_agnumber_t agno);
> -void xfs_free_perag(struct xfs_mount *mp);
>  
>  /* Passive AG references */
>  struct xfs_perag *xfs_perag_get(struct xfs_mount *mp, xfs_agnumber_t agno);
> diff --git a/fs/xfs/xfs_fsops.c b/fs/xfs/xfs_fsops.c
> index de2bf0594cb474..b247d895c276d2 100644
> --- a/fs/xfs/xfs_fsops.c
> +++ b/fs/xfs/xfs_fsops.c
> @@ -229,7 +229,7 @@ xfs_growfs_data_private(
>  	xfs_trans_cancel(tp);
>  out_free_unused_perag:
>  	if (nagcount > oagcount)
> -		xfs_free_unused_perag_range(mp, oagcount, nagcount);
> +		xfs_free_perag_range(mp, oagcount, nagcount);
>  	return error;
>  }
>  
> diff --git a/fs/xfs/xfs_mount.c b/fs/xfs/xfs_mount.c
> index 0f4f56a7f02d9a..6671ee3849c239 100644
> --- a/fs/xfs/xfs_mount.c
> +++ b/fs/xfs/xfs_mount.c
> @@ -1044,7 +1044,7 @@ xfs_mountfs(
>  		xfs_buftarg_drain(mp->m_logdev_targp);
>  	xfs_buftarg_drain(mp->m_ddev_targp);
>   out_free_perag:
> -	xfs_free_perag(mp);
> +	xfs_free_perag_range(mp, 0, mp->m_sb.sb_agcount);
>   out_free_dir:
>  	xfs_da_unmount(mp);
>   out_remove_uuid:
> @@ -1125,8 +1125,7 @@ xfs_unmountfs(
>  	xfs_errortag_clearall(mp);
>  #endif
>  	shrinker_free(mp->m_inodegc_shrinker);
> -	xfs_free_perag(mp);
> -
> +	xfs_free_perag_range(mp, 0, mp->m_sb.sb_agcount);
>  	xfs_errortag_del(mp);
>  	xfs_error_sysfs_del(mp);
>  	xchk_stats_unregister(mp->m_scrub_stats);
> -- 
> 2.45.2
> 
>
Christoph Hellwig Sept. 18, 2024, 6:15 a.m. UTC | #2 
On Tue, Sep 17, 2024 at 11:55:56AM -0700, Darrick J. Wong wrote:
> And I guess the extra xfs_perag_rele is ok because xfs_initialize_perag
> sets it to 1 and the _unused free function didn't care what the active
> refcount was?

Yes.
diff mbox series

Patch

diff --git a/fs/xfs/libxfs/xfs_ag.c b/fs/xfs/libxfs/xfs_ag.c
index 5186735da5d45a..3f695100d7ab58 100644
--- a/fs/xfs/libxfs/xfs_ag.c
+++ b/fs/xfs/libxfs/xfs_ag.c
@@ -185,17 +185,20 @@  xfs_initialize_perag_data(
 }
 
 /*
- * Free up the per-ag resources associated with the mount structure.
+ * Free up the per-ag resources  within the specified AG range.
  */
 void
-xfs_free_perag(
-	struct xfs_mount	*mp)
+xfs_free_perag_range(
+	struct xfs_mount	*mp,
+	xfs_agnumber_t		first_agno,
+	xfs_agnumber_t		end_agno)
+
 {
-	struct xfs_perag	*pag;
 	xfs_agnumber_t		agno;
 
-	for (agno = 0; agno < mp->m_sb.sb_agcount; agno++) {
-		pag = xa_erase(&mp->m_perags, agno);
+	for (agno = first_agno; agno < end_agno; agno++) {
+		struct xfs_perag	*pag = xa_erase(&mp->m_perags, agno);
+
 		ASSERT(pag);
 		XFS_IS_CORRUPT(pag->pag_mount, atomic_read(&pag->pag_ref) != 0);
 		xfs_defer_drain_free(&pag->pag_intents_drain);
@@ -270,29 +273,6 @@  xfs_agino_range(
 	return __xfs_agino_range(mp, xfs_ag_block_count(mp, agno), first, last);
 }
 
-/*
- * Free perag within the specified AG range, it is only used to free unused
- * perags under the error handling path.
- */
-void
-xfs_free_unused_perag_range(
-	struct xfs_mount	*mp,
-	xfs_agnumber_t		agstart,
-	xfs_agnumber_t		agend)
-{
-	struct xfs_perag	*pag;
-	xfs_agnumber_t		index;
-
-	for (index = agstart; index < agend; index++) {
-		pag = xa_erase(&mp->m_perags, index);
-		if (!pag)
-			break;
-		xfs_buf_cache_destroy(&pag->pag_bcache);
-		xfs_defer_drain_free(&pag->pag_intents_drain);
-		kfree(pag);
-	}
-}
-
 int
 xfs_initialize_perag(
 	struct xfs_mount	*mp,
@@ -369,7 +349,7 @@  xfs_initialize_perag(
 out_free_pag:
 	kfree(pag);
 out_unwind_new_pags:
-	xfs_free_unused_perag_range(mp, old_agcount, index);
+	xfs_free_perag_range(mp, old_agcount, index);
 	return error;
 }
 
diff --git a/fs/xfs/libxfs/xfs_ag.h b/fs/xfs/libxfs/xfs_ag.h
index 69fc31e7b84728..6e68d6a3161a0f 100644
--- a/fs/xfs/libxfs/xfs_ag.h
+++ b/fs/xfs/libxfs/xfs_ag.h
@@ -144,13 +144,12 @@  __XFS_AG_OPSTATE(prefers_metadata, PREFERS_METADATA)
 __XFS_AG_OPSTATE(allows_inodes, ALLOWS_INODES)
 __XFS_AG_OPSTATE(agfl_needs_reset, AGFL_NEEDS_RESET)
 
-void xfs_free_unused_perag_range(struct xfs_mount *mp, xfs_agnumber_t agstart,
-			xfs_agnumber_t agend);
 int xfs_initialize_perag(struct xfs_mount *mp, xfs_agnumber_t old_agcount,
 		xfs_agnumber_t agcount, xfs_rfsblock_t dcount,
 		xfs_agnumber_t *maxagi);
+void xfs_free_perag_range(struct xfs_mount *mp, xfs_agnumber_t first_agno,
+		xfs_agnumber_t end_agno);
 int xfs_initialize_perag_data(struct xfs_mount *mp, xfs_agnumber_t agno);
-void xfs_free_perag(struct xfs_mount *mp);
 
 /* Passive AG references */
 struct xfs_perag *xfs_perag_get(struct xfs_mount *mp, xfs_agnumber_t agno);
diff --git a/fs/xfs/xfs_fsops.c b/fs/xfs/xfs_fsops.c
index de2bf0594cb474..b247d895c276d2 100644
--- a/fs/xfs/xfs_fsops.c
+++ b/fs/xfs/xfs_fsops.c
@@ -229,7 +229,7 @@  xfs_growfs_data_private(
 	xfs_trans_cancel(tp);
 out_free_unused_perag:
 	if (nagcount > oagcount)
-		xfs_free_unused_perag_range(mp, oagcount, nagcount);
+		xfs_free_perag_range(mp, oagcount, nagcount);
 	return error;
 }
 
diff --git a/fs/xfs/xfs_mount.c b/fs/xfs/xfs_mount.c
index 0f4f56a7f02d9a..6671ee3849c239 100644
--- a/fs/xfs/xfs_mount.c
+++ b/fs/xfs/xfs_mount.c
@@ -1044,7 +1044,7 @@  xfs_mountfs(
 		xfs_buftarg_drain(mp->m_logdev_targp);
 	xfs_buftarg_drain(mp->m_ddev_targp);
  out_free_perag:
-	xfs_free_perag(mp);
+	xfs_free_perag_range(mp, 0, mp->m_sb.sb_agcount);
  out_free_dir:
 	xfs_da_unmount(mp);
  out_remove_uuid:
@@ -1125,8 +1125,7 @@  xfs_unmountfs(
 	xfs_errortag_clearall(mp);
 #endif
 	shrinker_free(mp->m_inodegc_shrinker);
-	xfs_free_perag(mp);
-
+	xfs_free_perag_range(mp, 0, mp->m_sb.sb_agcount);
 	xfs_errortag_del(mp);
 	xfs_error_sysfs_del(mp);
 	xchk_stats_unregister(mp->m_scrub_stats);