linux-kernel - Re: [PATCH v3 1/5] zonefs: pass GFP_KERNEL to blkdev_zone

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Message-ID: <6f0aed31-b9a9-4655-9c8c-839f978b40d9@kernel.org>
Date: Tue, 30 Jan 2024 08:25:31 +0900
From: Damien Le Moal <dlemoal@...nel.org>
To: Johannes Thumshirn <johannes.thumshirn@....com>,
 Naohiro Aota <naohiro.aota@....com>, Johannes Thumshirn <jth@...nel.org>,
 Alasdair Kergon <agk@...hat.com>, Mike Snitzer <snitzer@...nel.org>,
 Mikulas Patocka <mpatocka@...hat.com>, dm-devel@...ts.linux.dev,
 Chris Mason <clm@...com>, Josef Bacik <josef@...icpanda.com>,
 David Sterba <dsterba@...e.com>, Jaegeuk Kim <jaegeuk@...nel.org>,
 Chao Yu <chao@...nel.org>, Jens Axboe <axboe@...nel.dk>,
 Christoph Hellwig <hch@....de>, Sagi Grimberg <sagi@...mberg.me>,
 Chaitanya Kulkarni <kch@...dia.com>
Cc: linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org,
 linux-btrfs@...r.kernel.org, linux-f2fs-devel@...ts.sourceforge.net,
 linux-block@...r.kernel.org, linux-nvme@...ts.infradead.org
Subject: Re: [PATCH v3 1/5] zonefs: pass GFP_KERNEL to blkdev_zone_mgmt() call

On 1/29/24 16:52, Johannes Thumshirn wrote:
> Pass GFP_KERNEL instead of GFP_NOFS to the blkdev_zone_mgmt() call in
> zonefs_zone_mgmt().
> 
> As as zonefs_zone_mgmt() and zonefs_inode_zone_mgmt() are never called
> from a place that can recurse back into the filesystem on memory reclaim,
> it is save to call blkdev_zone_mgmt() with GFP_KERNEL.

s/save/safe

> Link: https://lore.kernel.org/all/ZZcgXI46AinlcBDP@casper.infradead.org/
> Signed-off-by: Johannes Thumshirn <johannes.thumshirn@....com>
> ---
>  fs/zonefs/super.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/fs/zonefs/super.c b/fs/zonefs/super.c
> index 93971742613a..63fbac018c04 100644
> --- a/fs/zonefs/super.c
> +++ b/fs/zonefs/super.c
> @@ -113,7 +113,7 @@ static int zonefs_zone_mgmt(struct super_block *sb,
>  
>  	trace_zonefs_zone_mgmt(sb, z, op);
>  	ret = blkdev_zone_mgmt(sb->s_bdev, op, z->z_sector,
> -			       z->z_size >> SECTOR_SHIFT, GFP_NOFS);
> +			       z->z_size >> SECTOR_SHIFT, GFP_KERNEL);
>  	if (ret) {
>  		zonefs_err(sb,
>  			   "Zone management operation %s at %llu failed %d\n",

I think this is OK but I will need a little more time to fully convince myself.
So let me look again at the code to check all the calls contexts.

-- 
Damien Le Moal
Western Digital Research