linux-kernel - Re: [f2fs-dev] [PATCH] f2fs: clean up vm_map

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Date:   Tue, 8 Sep 2020 20:28:02 -0700
From:   Jaegeuk Kim <jaegeuk@...nel.org>
To:     Chao Yu <yuchao0@...wei.com>
Cc:     Daeho Jeong <daeho43@...il.com>, linux-kernel@...r.kernel.org,
        linux-f2fs-devel@...ts.sourceforge.net, kernel-team@...roid.com,
        Daeho Jeong <daehojeong@...gle.com>
Subject: Re: [f2fs-dev] [PATCH] f2fs: clean up vm_map_ram() call

On 09/09, Chao Yu wrote:
> On 2020/9/9 10:36, Daeho Jeong wrote:
> > From: Daeho Jeong <daehojeong@...gle.com>
> > 
> > Made f2fs_vmap() wrapper to handle vm_map_ram() stuff.
> > 
> > Signed-off-by: Daeho Jeong <daehojeong@...gle.com>
> 
> LGTM,
> 
> I think it should be merged into original patch. :)
> 
> Maybe Jaeguek could help to do that.

Yeah, no worries. :)

> 
> Thanks,
> 
> > ---
> >   fs/f2fs/compress.c | 42 ++++++++++++++++++------------------------
> >   1 file changed, 18 insertions(+), 24 deletions(-)
> > 
> > diff --git a/fs/f2fs/compress.c b/fs/f2fs/compress.c
> > index 357303d8514b..7895186cc765 100644
> > --- a/fs/f2fs/compress.c
> > +++ b/fs/f2fs/compress.c
> > @@ -557,6 +557,20 @@ static void f2fs_compress_free_page(struct page *page)
> >   #define MAX_VMAP_RETRIES	3
> > +static void *f2fs_vmap(struct page **pages, unsigned int count)
> > +{
> > +	int i;
> > +	void *buf = NULL;
> > +
> > +	for (i = 0; i < MAX_VMAP_RETRIES; i++) {
> > +		buf = vm_map_ram(pages, count, -1);
> > +		if (buf)
> > +			break;
> > +		vm_unmap_aliases();
> > +	}
> > +	return buf;
> > +}
> > +
> >   static int f2fs_compress_pages(struct compress_ctx *cc)
> >   {
> >   	struct f2fs_sb_info *sbi = F2FS_I_SB(cc->inode);
> > @@ -593,23 +607,13 @@ static int f2fs_compress_pages(struct compress_ctx *cc)
> >   		}
> >   	}
> > -	for (i = 0; i < MAX_VMAP_RETRIES; i++) {
> > -		cc->rbuf = vm_map_ram(cc->rpages, cc->cluster_size, -1);
> > -		if (cc->rbuf)
> > -			break;
> > -		vm_unmap_aliases();
> > -	}
> > +	cc->rbuf = f2fs_vmap(cc->rpages, cc->cluster_size);
> >   	if (!cc->rbuf) {
> >   		ret = -ENOMEM;
> >   		goto out_free_cpages;
> >   	}
> > -	for (i = 0; i < MAX_VMAP_RETRIES; i++) {
> > -		cc->cbuf = vm_map_ram(cc->cpages, cc->nr_cpages, -1);
> > -		if (cc->cbuf)
> > -			break;
> > -		vm_unmap_aliases();
> > -	}
> > +	cc->cbuf = f2fs_vmap(cc->cpages, cc->nr_cpages);
> >   	if (!cc->cbuf) {
> >   		ret = -ENOMEM;
> >   		goto out_vunmap_rbuf;
> > @@ -728,23 +732,13 @@ void f2fs_decompress_pages(struct bio *bio, struct page *page, bool verity)
> >   			goto out_free_dic;
> >   	}
> > -	for (i = 0; i < MAX_VMAP_RETRIES; i++) {
> > -		dic->rbuf = vm_map_ram(dic->tpages, dic->cluster_size, -1);
> > -		if (dic->rbuf)
> > -			break;
> > -		vm_unmap_aliases();
> > -	}
> > +	dic->rbuf = f2fs_vmap(dic->tpages, dic->cluster_size);
> >   	if (!dic->rbuf) {
> >   		ret = -ENOMEM;
> >   		goto destroy_decompress_ctx;
> >   	}
> > -	for (i = 0; i < MAX_VMAP_RETRIES; i++) {
> > -		dic->cbuf = vm_map_ram(dic->cpages, dic->nr_cpages, -1);
> > -		if (dic->cbuf)
> > -			break;
> > -		vm_unmap_aliases();
> > -	}
> > +	dic->cbuf = f2fs_vmap(dic->cpages, dic->nr_cpages);
> >   	if (!dic->cbuf) {
> >   		ret = -ENOMEM;
> >   		goto out_vunmap_rbuf;
> > 
> 
> 
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