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From: Johannes Thumshirn <johannes.thumshirn@wdc.com>
Subject: [PATCH v3 0/5] block: remove gfp_mask for blkdev_zone_mgmt()
Date: Sun, 28 Jan 2024 23:52:15 -0800
Message-Id: <20240128-zonefs_nofs-v3-0-ae3b7c8def61@wdc.com>
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To: Damien Le Moal <dlemoal@kernel.org>, 
 Naohiro Aota <naohiro.aota@wdc.com>, Johannes Thumshirn <jth@kernel.org>, 
 Alasdair Kergon <agk@redhat.com>, Mike Snitzer <snitzer@kernel.org>, 
 Mikulas Patocka <mpatocka@redhat.com>, dm-devel@lists.linux.dev, 
 Chris Mason <clm@fb.com>, Josef Bacik <josef@toxicpanda.com>, 
 David Sterba <dsterba@suse.com>, Jaegeuk Kim <jaegeuk@kernel.org>, 
 Chao Yu <chao@kernel.org>, Jens Axboe <axboe@kernel.dk>, 
 Christoph Hellwig <hch@lst.de>, Sagi Grimberg <sagi@grimberg.me>, 
 Chaitanya Kulkarni <kch@nvidia.com>
Cc: linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org, 
 linux-btrfs@vger.kernel.org, linux-f2fs-devel@lists.sourceforge.net, 
 linux-block@vger.kernel.org, linux-nvme@lists.infradead.org, 
 Johannes Thumshirn <johannes.thumshirn@wdc.com>

Fueled by the LSFMM discussion on removing GFP_NOFS initiated by Willy,
I've looked into the sole GFP_NOFS allocation in zonefs. As it turned out,
it is only done for zone management commands and can be removed.

After digging into more callers of blkdev_zone_mgmt() I came to the
conclusion that the gfp_mask parameter can be removed alltogether.

So this series switches all callers of blkdev_zone_mgmt() to either use
GFP_KERNEL where possible or grab a memalloc_no{fs,io} context.

The final patch in this series is getting rid of the gfp_mask parameter.

Link: https://lore.kernel.org/all/ZZcgXI46AinlcBDP@casper.infradead.org/

---
Changes in v3:
- Fix build error after rebase in dm-zoned-metadata.c
- Link to v2: https://lore.kernel.org/r/20240125-zonefs_nofs-v2-0-2d975c8c1690@wdc.com

Changes in v2:
- guard blkdev_zone_mgmt in dm-zoned-metadata.c with memalloc_noio context
- Link to v1: https://lore.kernel.org/r/20240123-zonefs_nofs-v1-0-cc0b0308ef25@wdc.com

---
Johannes Thumshirn (5):
      zonefs: pass GFP_KERNEL to blkdev_zone_mgmt() call
      dm: dm-zoned: guard blkdev_zone_mgmt with noio scope
      btrfs: zoned: call blkdev_zone_mgmt in nofs scope
      f2fs: guard blkdev_zone_mgmt with nofs scope
      block: remove gfp_flags from blkdev_zone_mgmt

 block/blk-zoned.c              | 19 ++++++++-----------
 drivers/md/dm-zoned-metadata.c |  5 ++++-
 drivers/nvme/target/zns.c      |  5 ++---
 fs/btrfs/zoned.c               | 35 +++++++++++++++++++++++++----------
 fs/f2fs/segment.c              | 15 ++++++++++++---
 fs/zonefs/super.c              |  2 +-
 include/linux/blkdev.h         |  2 +-
 7 files changed, 53 insertions(+), 30 deletions(-)
---
base-commit: 615d300648869c774bd1fe54b4627bb0c20faed4
change-id: 20240110-zonefs_nofs-dd1e22b2e046

Best regards,
-- 
Johannes Thumshirn <johannes.thumshirn@wdc.com>