From: Christoph Hellwig <hch@lst.de>
To: Dan Williams <dan.j.williams@intel.com>
Cc: jack@suse.cz, "Darrick J. Wong" <darrick.wong@oracle.com>,
linux-nvdimm@lists.01.org, Dave Chinner <david@fromorbit.com>,
linux-kernel@vger.kernel.org, linux-xfs@vger.kernel.org,
linux-fsdevel@vger.kernel.org, Christoph Hellwig <hch@lst.de>
Subject: Re: [PATCH v6 13/15] xfs: communicate lock drop events from xfs_break_layouts()
Date: Fri, 16 Mar 2018 20:08:01 +0100 [thread overview]
Message-ID: <20180316190801.GG3671@lst.de> (raw)
In-Reply-To: <152112915950.24669.2377167541944853596.stgit@dwillia2-desk3.amr.corp.intel.com>
On Thu, Mar 15, 2018 at 08:52:39AM -0700, Dan Williams wrote:
> In preparation for adding a new layout type, teach xfs_break_layouts()
> to return a positive number if it needed to drop locks while trying to
> break leases. For all layouts to be successfully broken each layout type
> needs to be able to assert that the layouts were broken with the locks
> held.
>
> The existing a xfs_break_layouts() is pushed down a level to
> xfs_break_leased_layouts() and the new xfs_break_layouts() will
> coordinate interpreting the return code from the low level 'break'
> helpers.
With that the subject line is rather confusing, given that the
externally visible xfs_break_layouts does not communicate the lock
drop events. So maybe this should just be titled something about
refactoring. Or just merged into the next patch which reshuffles
everything again anyway.
> int
> -xfs_break_layouts(
> +xfs_break_leased_layouts(
> struct inode *inode,
> uint *iolock)
> {
> struct xfs_inode *ip = XFS_I(inode);
> int error;
> -
> - ASSERT(xfs_isilocked(ip, XFS_IOLOCK_SHARED | XFS_IOLOCK_EXCL
> - | XFS_MMAPLOCK_EXCL));
> + int did_unlock = 0;
>
> while ((error = break_layout(inode, false) == -EWOULDBLOCK)) {
> xfs_iunlock(ip, *iolock);
> + did_unlock = 1;
> error = break_layout(inode, true);
> *iolock &= ~XFS_IOLOCK_SHARED;
> *iolock |= XFS_IOLOCK_EXCL;
> xfs_ilock(ip, *iolock);
> }
>
> - return error;
> + if (error < 0)
> + return error;
> + return did_unlock;
And I suspect the cleaner interface would be to just pass a
bool *did_unlock argument.
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next prev parent reply other threads:[~2018-03-16 19:01 UTC|newest]
Thread overview: 40+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-03-15 15:51 [PATCH v6 00/15] dax: fix dma vs truncate/hole-punch Dan Williams
2018-03-15 15:51 ` [PATCH v6 01/15] dax: store pfns in the radix Dan Williams
2018-03-15 15:51 ` [PATCH v6 02/15] fs, dax: prepare for dax-specific address_space_operations Dan Williams
2018-03-16 18:59 ` Christoph Hellwig
2018-03-15 15:51 ` [PATCH v6 03/15] block, dax: remove dead code in blkdev_writepages() Dan Williams
2018-03-16 18:59 ` Christoph Hellwig
2018-03-15 15:51 ` [PATCH v6 04/15] xfs, dax: introduce xfs_dax_aops Dan Williams
2018-03-16 19:00 ` Christoph Hellwig
2018-03-15 15:51 ` [PATCH v6 05/15] ext4, dax: introduce ext4_dax_aops Dan Williams
2018-03-15 15:51 ` [PATCH v6 06/15] ext2, dax: introduce ext2_dax_aops Dan Williams
2018-03-18 4:02 ` kbuild test robot
2018-03-18 4:02 ` [RFC PATCH] ext2, dax: ext2_dax_aops can be static kbuild test robot
2018-03-15 15:52 ` [PATCH v6 07/15] fs, dax: use page->mapping to warn if truncate collides with a busy page Dan Williams
2018-03-18 6:26 ` kbuild test robot
2018-03-15 15:52 ` [PATCH v6 08/15] mm, dax: enable filesystems to trigger dev_pagemap ->page_free callbacks Dan Williams
2018-03-15 15:52 ` [PATCH v6 09/15] mm, dev_pagemap: introduce CONFIG_DEV_PAGEMAP_OPS Dan Williams
2018-03-15 15:52 ` [PATCH v6 10/15] memremap: mark devm_memremap_pages() EXPORT_SYMBOL_GPL Dan Williams
2018-03-15 15:52 ` [PATCH v6 11/15] mm, fs, dax: handle layout changes to pinned dax mappings Dan Williams
2018-03-16 19:01 ` Christoph Hellwig
2018-03-17 22:14 ` kbuild test robot
2018-03-15 15:52 ` [PATCH v6 12/15] xfs: require mmap lock for xfs_break_layouts() Dan Williams
2018-03-16 19:04 ` Christoph Hellwig
2018-03-16 19:10 ` Dan Williams
2018-03-19 17:33 ` Darrick J. Wong
2018-03-19 17:57 ` Dan Williams
2018-03-19 18:19 ` Darrick J. Wong
2018-03-19 18:34 ` Dan Williams
2018-03-19 19:45 ` Christoph Hellwig
2018-03-19 20:10 ` Dan Williams
2018-03-19 21:14 ` Christoph Hellwig
2018-03-15 15:52 ` [PATCH v6 13/15] xfs: communicate lock drop events from xfs_break_layouts() Dan Williams
2018-03-16 19:08 ` Christoph Hellwig [this message]
2018-03-15 15:52 ` [PATCH v6 14/15] xfs: prepare xfs_break_layouts() for another layout type Dan Williams
2018-03-16 19:08 ` Christoph Hellwig
2018-03-19 17:45 ` Darrick J. Wong
2018-03-19 18:09 ` Dan Williams
2018-03-15 15:52 ` [PATCH v6 15/15] xfs, dax: introduce xfs_break_dax_layouts() Dan Williams
2018-03-16 19:09 ` Christoph Hellwig
2018-03-17 22:11 ` kbuild test robot
2018-03-17 23:47 ` kbuild test robot
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