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btrfs: switch to kvmalloc and GFP_KERNEL in lzo/zlib alloc_workspace 

The compression workspace buffers are larger than a page so we use
vmalloc, unconditionally. This is not always necessary as there might be
contiguous memory available.

Let's use the kvmalloc helpers that will try kmalloc first and fallback
to vmalloc. For that they require GFP_KERNEL flags. As we now have the
alloc_workspace calls protected by memalloc_nofs in the critical
contexts, we can safely use GFP_KERNEL.

Signed-off-by: David Sterba <dsterba@suse.com>
This commit is contained in:
David Sterba 2017-05-31 17:21:15 +02:00
parent 389a6cfc2a
commit 6acafd1eff
2 changed files with 10 additions and 10 deletions
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14
fs/btrfs/lzo.c
View File

@ -18,7 +18,7 @@
#include <linux/kernel.h>
#include <linux/slab.h>
#include <linux/vmalloc.h>
#include <linux/mm.h>
#include <linux/init.h>
#include <linux/err.h>
#include <linux/sched.h>
@ -41,9 +41,9 @@ static void lzo_free_workspace(struct list_head *ws)
{
struct workspace *workspace = list_entry(ws, struct workspace, list);
vfree(workspace->buf);
vfree(workspace->cbuf);
vfree(workspace->mem);
kvfree(workspace->buf);
kvfree(workspace->cbuf);
kvfree(workspace->mem);
kfree(workspace);
}
@ -55,9 +55,9 @@ static struct list_head *lzo_alloc_workspace(void)
if (!workspace)
return ERR_PTR(-ENOMEM);
workspace->mem = vmalloc(LZO1X_MEM_COMPRESS);
workspace->buf = vmalloc(lzo1x_worst_compress(PAGE_SIZE));
workspace->cbuf = vmalloc(lzo1x_worst_compress(PAGE_SIZE));
workspace->mem = kvmalloc(LZO1X_MEM_COMPRESS, GFP_KERNEL);
workspace->buf = kvmalloc(lzo1x_worst_compress(PAGE_SIZE), GFP_KERNEL);
workspace->cbuf = kvmalloc(lzo1x_worst_compress(PAGE_SIZE), GFP_KERNEL);
if (!workspace->mem || !workspace->buf || !workspace->cbuf)
goto fail;

6
fs/btrfs/zlib.c
View File

@ -24,7 +24,7 @@
#include <linux/slab.h>
#include <linux/zlib.h>
#include <linux/zutil.h>
#include <linux/vmalloc.h>
#include <linux/mm.h>
#include <linux/init.h>
#include <linux/err.h>
#include <linux/sched.h>
@ -43,7 +43,7 @@ static void zlib_free_workspace(struct list_head *ws)
{
struct workspace *workspace = list_entry(ws, struct workspace, list);
vfree(workspace->strm.workspace);
kvfree(workspace->strm.workspace);
kfree(workspace->buf);
kfree(workspace);
}
@ -59,7 +59,7 @@ static struct list_head *zlib_alloc_workspace(void)
workspacesize = max(zlib_deflate_workspacesize(MAX_WBITS, MAX_MEM_LEVEL),
zlib_inflate_workspacesize());
workspace->strm.workspace = vmalloc(workspacesize);
workspace->strm.workspace = kvmalloc(workspacesize, GFP_KERNEL);
workspace->buf = kmalloc(PAGE_SIZE, GFP_KERNEL);
if (!workspace->strm.workspace || !workspace->buf)
goto fail;