From: Shiyang Ruan <ruansy.fnst@fujitsu.com>
To: <dan.j.williams@intel.com>
Cc: Christoph Hellwig <hch@infradead.org>,
<linux-kernel@vger.kernel.org>, <linux-xfs@vger.kernel.org>,
<nvdimm@lists.linux.dev>, <linux-mm@kvack.org>,
<linux-fsdevel@vger.kernel.org>, <djwong@kernel.org>,
<david@fromorbit.com>, <jane.chu@oracle.com>
Subject: Re: [PATCH v11 7/8] xfs: Implement ->notify_failure() for XFS
Date: Fri, 8 Apr 2022 14:04:58 +0800 [thread overview]
Message-ID: <8f1931d2-b224-de98-4593-df136f397eb4@fujitsu.com> (raw)
In-Reply-To: <YkPyBQer+KRiregd@infradead.org>
在 2022/3/30 14:00, Christoph Hellwig 写道:
>> @@ -1892,6 +1893,8 @@ xfs_free_buftarg(
>> list_lru_destroy(&btp->bt_lru);
>>
>> blkdev_issue_flush(btp->bt_bdev);
>> + if (btp->bt_daxdev)
>> + dax_unregister_holder(btp->bt_daxdev, btp->bt_mount);
>> fs_put_dax(btp->bt_daxdev);
>>
>> kmem_free(btp);
>> @@ -1939,6 +1942,7 @@ xfs_alloc_buftarg(
>> struct block_device *bdev)
>> {
>> xfs_buftarg_t *btp;
>> + int error;
>>
>> btp = kmem_zalloc(sizeof(*btp), KM_NOFS);
>>
>> @@ -1946,6 +1950,14 @@ xfs_alloc_buftarg(
>> btp->bt_dev = bdev->bd_dev;
>> btp->bt_bdev = bdev;
>> btp->bt_daxdev = fs_dax_get_by_bdev(bdev, &btp->bt_dax_part_off);
>> + if (btp->bt_daxdev) {
>> + error = dax_register_holder(btp->bt_daxdev, mp,
>> + &xfs_dax_holder_operations);
>> + if (error) {
>> + xfs_err(mp, "DAX device already in use?!");
>> + goto error_free;
>> + }
>> + }
>
> It seems to me that just passing the holder and holder ops to
> fs_dax_get_by_bdev and the holder to dax_unregister_holder would
> significantly simply the interface here.
>
> Dan, what do you think?
Hi Dan,
Could you give some advise on this API? Is it needed to move
dax_register_holder's job into fs_dax_get_by_bdev()?
--
Thanks,
Ruan
>
>> +#if IS_ENABLED(CONFIG_MEMORY_FAILURE) && IS_ENABLED(CONFIG_FS_DAX)
>
> No real need for the IS_ENABLED. Also any reason to even build this
> file if the options are not set? It seems like
> xfs_dax_holder_operations should just be defined to NULL and the
> whole file not supported if we can't support the functionality.
>
> Dan: not for this series, but is there any reason not to require
> MEMORY_FAILURE for DAX to start with?
>
>> +
>> + ddev_start = mp->m_ddev_targp->bt_dax_part_off;
>> + ddev_end = ddev_start +
>> + (mp->m_ddev_targp->bt_bdev->bd_nr_sectors << SECTOR_SHIFT) - 1;
>
> This should use bdev_nr_bytes.
>
> But didn't we say we don't want to support notifications on partitioned
> devices and thus don't actually need all this?
>
>> +
>> + /* Ignore the range out of filesystem area */
>> + if ((offset + len) < ddev_start)
>
> No need for the inner braces.
>
>> + if ((offset + len) > ddev_end)
>
> No need for the braces either.
>
>> diff --git a/fs/xfs/xfs_notify_failure.h b/fs/xfs/xfs_notify_failure.h
>> new file mode 100644
>> index 000000000000..76187b9620f9
>> --- /dev/null
>> +++ b/fs/xfs/xfs_notify_failure.h
>> @@ -0,0 +1,10 @@
>> +// SPDX-License-Identifier: GPL-2.0
>> +/*
>> + * Copyright (c) 2022 Fujitsu. All Rights Reserved.
>> + */
>> +#ifndef __XFS_NOTIFY_FAILURE_H__
>> +#define __XFS_NOTIFY_FAILURE_H__
>> +
>> +extern const struct dax_holder_operations xfs_dax_holder_operations;
>> +
>> +#endif /* __XFS_NOTIFY_FAILURE_H__ */
>
> Dowe really need a new header for this vs just sequeezing it into
> xfs_super.h or something like that?
>
>> diff --git a/fs/xfs/xfs_super.c b/fs/xfs/xfs_super.c
>> index e8f37bdc8354..b8de6ed2c888 100644
>> --- a/fs/xfs/xfs_super.c
>> +++ b/fs/xfs/xfs_super.c
>> @@ -353,6 +353,12 @@ xfs_setup_dax_always(
>> return -EINVAL;
>> }
>>
>> + if (xfs_has_reflink(mp) && !xfs_has_rmapbt(mp)) {
>> + xfs_alert(mp,
>> + "need rmapbt when both DAX and reflink enabled.");
>> + return -EINVAL;
>> + }
>
> Right now we can't even enable reflink with DAX yet, so adding this
> here seems premature - it should go into the patch allowing DAX+reflink.
>
next prev parent reply other threads:[~2022-04-08 6:05 UTC|newest]
Thread overview: 37+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-02-27 12:07 [PATCH v11 0/8] fsdax: introduce fs query to support reflink Shiyang Ruan
2022-02-27 12:07 ` [PATCH v11 1/8] dax: Introduce holder for dax_device Shiyang Ruan
2022-03-11 23:35 ` Dan Williams
2022-03-16 13:46 ` Shiyang Ruan
2022-03-30 5:41 ` Christoph Hellwig
2022-03-30 10:03 ` Shiyang Ruan
2022-03-30 10:13 ` Christoph Hellwig
2022-03-30 10:58 ` Shiyang Ruan
2022-03-30 15:49 ` Christoph Hellwig
2022-03-30 16:18 ` Darrick J. Wong
2022-04-06 0:55 ` Jane Chu
2022-04-06 1:22 ` Dan Williams
2022-04-06 20:39 ` Darrick J. Wong
2022-04-08 1:38 ` Dan Williams
2022-04-08 5:59 ` Shiyang Ruan
2022-03-30 5:41 ` Christoph Hellwig
2022-02-27 12:07 ` [PATCH v11 2/8] mm: factor helpers for memory_failure_dev_pagemap Shiyang Ruan
2022-02-27 12:07 ` [PATCH v11 3/8] pagemap,pmem: Introduce ->memory_failure() Shiyang Ruan
2022-02-27 12:07 ` [PATCH v11 4/8] fsdax: Introduce dax_lock_mapping_entry() Shiyang Ruan
2022-02-27 12:07 ` [PATCH v11 5/8] mm: move pgoff_address() to vma_pgoff_address() Shiyang Ruan
2022-03-30 5:46 ` Christoph Hellwig
2022-03-30 6:49 ` Shiyang Ruan
2022-02-27 12:07 ` [PATCH v11 6/8] mm: Introduce mf_dax_kill_procs() for fsdax case Shiyang Ruan
2022-03-30 5:51 ` Christoph Hellwig
2022-02-27 12:07 ` [PATCH v11 7/8] xfs: Implement ->notify_failure() for XFS Shiyang Ruan
2022-02-27 14:05 ` kernel test robot
2022-02-27 15:36 ` kernel test robot
2022-02-27 15:46 ` kernel test robot
2022-03-30 6:00 ` Christoph Hellwig
2022-03-30 15:16 ` Shiyang Ruan
2022-03-30 15:52 ` Christoph Hellwig
2022-04-08 6:04 ` Shiyang Ruan [this message]
2022-04-08 6:26 ` Dan Williams
2022-04-08 6:25 ` Dan Williams
2022-02-27 12:07 ` [PATCH v11 8/8] fsdax: set a CoW flag when associate reflink mappings Shiyang Ruan
2022-02-27 15:57 ` kernel test robot
2022-03-10 13:08 ` [PATCH v11 0/8] fsdax: introduce fs query to support reflink Shiyang Ruan
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