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From: Dave Chinner <david@fromorbit.com>
To: linux-xfs@vger.kernel.org
Cc: hch@lst.de
Subject: [PATCH 04/10] xfs: merge _xfs_buf_get_pages()
Date: Thu, 27 May 2021 08:47:16 +1000	[thread overview]
Message-ID: <20210526224722.1111377-5-david@fromorbit.com> (raw)
In-Reply-To: <20210526224722.1111377-1-david@fromorbit.com>

From: Dave Chinner <dchinner@redhat.com>

Only called from one place now, so merge it into
xfs_buf_alloc_pages(). Because page array allocation is dependent on
bp->b_pages being null, always ensure that when the pages array is
freed we always set bp->b_pages to null.

Also convert the page array to use kmalloc() rather than
kmem_alloc() so we can use the gfp flags we've already calculated
for the allocation context instead of hard coding KM_NOFS semantics.

Signed-off-by: Dave Chinner <dchinner@redhat.com>
---
 fs/xfs/xfs_buf.c | 48 ++++++++++++++----------------------------------
 1 file changed, 14 insertions(+), 34 deletions(-)

diff --git a/fs/xfs/xfs_buf.c b/fs/xfs/xfs_buf.c
index 8ca4add138c5..aa978111c01f 100644
--- a/fs/xfs/xfs_buf.c
+++ b/fs/xfs/xfs_buf.c
@@ -272,31 +272,6 @@ _xfs_buf_alloc(
 	return 0;
 }
 
-/*
- *	Allocate a page array capable of holding a specified number
- *	of pages, and point the page buf at it.
- */
-STATIC int
-_xfs_buf_get_pages(
-	struct xfs_buf		*bp,
-	int			page_count)
-{
-	/* Make sure that we have a page list */
-	if (bp->b_pages == NULL) {
-		bp->b_page_count = page_count;
-		if (page_count <= XB_PAGES) {
-			bp->b_pages = bp->b_page_array;
-		} else {
-			bp->b_pages = kmem_alloc(sizeof(struct page *) *
-						 page_count, KM_NOFS);
-			if (bp->b_pages == NULL)
-				return -ENOMEM;
-		}
-		memset(bp->b_pages, 0, sizeof(struct page *) * page_count);
-	}
-	return 0;
-}
-
 /*
  *	Frees b_pages if it was allocated.
  */
@@ -304,10 +279,9 @@ STATIC void
 _xfs_buf_free_pages(
 	struct xfs_buf	*bp)
 {
-	if (bp->b_pages != bp->b_page_array) {
+	if (bp->b_pages != bp->b_page_array)
 		kmem_free(bp->b_pages);
-		bp->b_pages = NULL;
-	}
+	bp->b_pages = NULL;
 }
 
 /*
@@ -389,16 +363,22 @@ xfs_buf_alloc_pages(
 	long		filled = 0;
 	int		error;
 
+	/* Make sure that we have a page list */
+	bp->b_page_count = page_count;
+	if (bp->b_page_count <= XB_PAGES) {
+		bp->b_pages = bp->b_page_array;
+	} else {
+		bp->b_pages = kzalloc(sizeof(struct page *) * bp->b_page_count,
+					gfp_mask);
+		if (!bp->b_pages)
+			return -ENOMEM;
+	}
+	bp->b_flags |= _XBF_PAGES;
+
 	/* Assure zeroed buffer for non-read cases. */
 	if (!(flags & XBF_READ))
 		gfp_mask |= __GFP_ZERO;
 
-	error = _xfs_buf_get_pages(bp, page_count);
-	if (unlikely(error))
-		return error;
-
-	bp->b_flags |= _XBF_PAGES;
-
 	/*
 	 * Bulk filling of pages can take multiple calls. Not filling the entire
 	 * array is not an allocation failure, so don't back off if we get at
-- 
2.31.1


  parent reply	other threads:[~2021-05-26 22:47 UTC|newest]

Thread overview: 25+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-05-26 22:47 [PATCH 00/10] xfs: buffer bulk page allocation and cleanups Dave Chinner
2021-05-26 22:47 ` [PATCH 01/10] xfs: split up xfs_buf_allocate_memory Dave Chinner
2021-05-27 22:48   ` Darrick J. Wong
2021-05-27 23:10     ` Darrick J. Wong
2021-05-26 22:47 ` [PATCH 02/10] xfs: use xfs_buf_alloc_pages for uncached buffers Dave Chinner
2021-05-27 22:50   ` Darrick J. Wong
2021-05-26 22:47 ` [PATCH 03/10] xfs: use alloc_pages_bulk_array() for buffers Dave Chinner
2021-05-27 22:59   ` Darrick J. Wong
2021-05-27 23:01     ` Darrick J. Wong
2021-05-26 22:47 ` Dave Chinner [this message]
2021-05-27 23:02   ` [PATCH 04/10] xfs: merge _xfs_buf_get_pages() Darrick J. Wong
2021-05-26 22:47 ` [PATCH 05/10] xfs: move page freeing into _xfs_buf_free_pages() Dave Chinner
2021-05-27 23:03   ` Darrick J. Wong
2021-05-26 22:47 ` [PATCH 06/10] xfs: remove ->b_offset handling for page backed buffers Dave Chinner
2021-05-27 23:09   ` Darrick J. Wong
2021-06-01  1:46     ` Dave Chinner
2021-05-26 22:47 ` [PATCH 07/10] xfs: simplify the b_page_count calculation Dave Chinner
2021-05-27 23:15   ` Darrick J. Wong
2021-05-27 23:29     ` Dave Chinner
2021-05-26 22:47 ` [PATCH 08/10] xfs: get rid of xb_to_gfp() Dave Chinner
2021-05-27 23:12   ` Darrick J. Wong
2021-05-26 22:47 ` [PATCH 09/10] xfs: cleanup error handling in xfs_buf_get_map Dave Chinner
2021-05-27 23:16   ` Darrick J. Wong
2021-05-26 22:47 ` [PATCH 10/10] xfs: merge xfs_buf_allocate_memory Dave Chinner
2021-05-27 23:17   ` Darrick J. Wong

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