From: Christoph Hellwig <hch@infradead.org>
To: Johannes Thumshirn <johannes.thumshirn@wdc.com>
Cc: David Sterba <dsterba@suse.cz>,
"linux-btrfs @ vger . kernel . org" <linux-btrfs@vger.kernel.org>
Subject: Re: [PATCH v7 4/8] btrfs: use the page-cache for super block reading
Date: Tue, 11 Feb 2020 23:28:46 -0800 [thread overview]
Message-ID: <20200212072846.GC30977@infradead.org> (raw)
In-Reply-To: <20200212071704.17505-5-johannes.thumshirn@wdc.com>
On Wed, Feb 12, 2020 at 04:17:00PM +0900, Johannes Thumshirn wrote:
> Super-block reading in BTRFS is done using buffer_heads. Buffer_heads have
> some drawbacks, like not being able to propagate errors from the lower
> layers.
>
> Directly use the page cache for reading the super-blocks from disk or
> invalidating an on-disk super-block. We have to use the page-cache so to
> avoid races between mkfs and udev. See also 6f60cbd3ae44 ("btrfs: access
> superblock via pagecache in scan_one_device").
>
> Signed-off-by: Johannes Thumshirn <johannes.thumshirn@wdc.com>
>
> ---
> Changes to v6:
> - Warn if we can't write out a page for a superblock (David)
Shouldn't there be some real error handling instead of just a warning?
At least shut down the file system?
next prev parent reply other threads:[~2020-02-12 7:28 UTC|newest]
Thread overview: 17+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-02-12 7:16 [PATCH v7 0/8] btrfs: remove buffer heads form superblock handling Johannes Thumshirn
2020-02-12 7:16 ` [PATCH v7 1/8] btrfs: Export btrfs_release_disk_super Johannes Thumshirn
2020-02-12 7:16 ` [PATCH v7 2/8] btrfs: don't kmap() pages from block devices Johannes Thumshirn
2020-02-12 7:25 ` Christoph Hellwig
2020-02-12 7:16 ` [PATCH v7 3/8] btrfs: unexport btrfs_scratch_superblocks Johannes Thumshirn
2020-02-12 7:27 ` Christoph Hellwig
2020-02-12 7:51 ` Johannes Thumshirn
2020-02-12 7:17 ` [PATCH v7 4/8] btrfs: use the page-cache for super block reading Johannes Thumshirn
2020-02-12 7:28 ` Christoph Hellwig [this message]
2020-02-12 7:43 ` Johannes Thumshirn
2020-02-12 7:17 ` [PATCH v7 5/8] btrfs: use BIOs instead of buffer_heads from superblock writeout Johannes Thumshirn
2020-02-12 7:30 ` Christoph Hellwig
2020-02-12 7:17 ` [PATCH v7 6/8] btrfs: remove btrfsic_submit_bh() Johannes Thumshirn
2020-02-12 7:17 ` [PATCH v7 7/8] btrfs: remove buffer_heads from btrfsic_process_written_block() Johannes Thumshirn
2020-02-12 7:17 ` [PATCH v7 8/8] btrfs: remove buffer_heads form superblock mirror integrity checking Johannes Thumshirn
2020-02-12 17:06 ` David Sterba
2020-02-13 9:12 ` Johannes Thumshirn
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