linux-kernel - [PATCH v2] btrfs: use kmalloc for lzo de/compress buffer

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Date:	Mon, 18 Feb 2013 16:56:04 +0900
From:	Kyungsik Lee <kyungsik.lee@....com>
To:	Chris Mason <chris.mason@...ionio.com>,
	linux-btrfs@...r.kernel.org, linux-kernel@...r.kernel.org
Cc:	hyojun.im@....com, chan.jeong@....com, raphael.andy.lee@...il.com,
	Kyungsik Lee <kyungsik.lee@....com>,
	David Sterba <dsterba@...e.cz>
Subject: [PATCH v2] btrfs: use kmalloc for lzo de/compress buffer

The size of de/compress buffer is small enough to use kmalloc.
Allocating it with kmalloc rather than vmalloc is preferred.

This patch depends on my previous patch, “btrfs: fix decompress buffer size”.

v2: Using vmalloc for "workspace->mem" due to the size limit.

Signed-off-by: Kyungsik Lee <kyungsik.lee@....com>
Cc: David Sterba <dsterba@...e.cz>
---
 fs/btrfs/lzo.c | 9 +++++----
 1 file changed, 5 insertions(+), 4 deletions(-)

diff --git a/fs/btrfs/lzo.c b/fs/btrfs/lzo.c
index 223893a..aaaab2e 100644
--- a/fs/btrfs/lzo.c
+++ b/fs/btrfs/lzo.c
@@ -40,8 +40,8 @@ static void lzo_free_workspace(struct list_head *ws)
 {
 	struct workspace *workspace = list_entry(ws, struct workspace, list);
 
-	vfree(workspace->buf);
-	vfree(workspace->cbuf);
+	kfree(workspace->buf);
+	kfree(workspace->cbuf);
 	vfree(workspace->mem);
 	kfree(workspace);
 }
@@ -55,8 +55,9 @@ static struct list_head *lzo_alloc_workspace(void)
 		return ERR_PTR(-ENOMEM);
 
 	workspace->mem = vmalloc(LZO1X_MEM_COMPRESS);
-	workspace->buf = vmalloc(PAGE_CACHE_SIZE);
-	workspace->cbuf = vmalloc(lzo1x_worst_compress(PAGE_CACHE_SIZE));
+	workspace->buf = kmalloc(PAGE_CACHE_SIZE, GFP_NOFS);
+	workspace->cbuf = kmalloc(lzo1x_worst_compress(PAGE_CACHE_SIZE),
+			GFP_NOFS);
 	if (!workspace->mem || !workspace->buf || !workspace->cbuf)
 		goto fail;
 
-- 
1.8.0.3

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