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From: "Darrick J. Wong" <darrick.wong@oracle.com>
To: Dan Williams <dan.j.williams@intel.com>
Cc: jack@suse.cz, 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 v7 12/14] xfs: prepare xfs_break_layouts() to be called with XFS_MMAPLOCK_EXCL
Date: Fri, 30 Mar 2018 08:16:00 -0700	[thread overview]
Message-ID: <20180330151600.GC13552@magnolia> (raw)
In-Reply-To: <152167310017.5268.8654419042128713101.stgit@dwillia2-desk3.amr.corp.intel.com>

On Wed, Mar 21, 2018 at 03:58:20PM -0700, Dan Williams wrote:
> In preparation for adding coordination between extent unmap operations
> and busy dax-pages, update xfs_break_layouts() to permit it to be called
> with the mmap lock held. This lock scheme will be required for
> coordinating the break of 'dax layouts' (non-idle dax (ZONE_DEVICE)
> pages mapped into the file's address space). Breaking dax layouts will
> be added to xfs_break_layouts() in a future patch, for now this preps
> the unmap call sites to take and hold XFS_MMAPLOCK_EXCL over the call to
> xfs_break_layouts().
> 
> Cc: "Darrick J. Wong" <darrick.wong@oracle.com>
> Cc: Ross Zwisler <ross.zwisler@linux.intel.com>
> Cc: Dave Chinner <david@fromorbit.com>
> Suggested-by: Christoph Hellwig <hch@lst.de>
> Signed-off-by: Dan Williams <dan.j.williams@intel.com>

Looks ok,
Reviewed-by: Darrick J. Wong <darrick.wong@oracle.com>

--D

> ---
>  fs/xfs/xfs_file.c  |    5 +----
>  fs/xfs/xfs_ioctl.c |    5 +----
>  fs/xfs/xfs_iops.c  |   10 +++++++---
>  fs/xfs/xfs_pnfs.c  |    3 ++-
>  4 files changed, 11 insertions(+), 12 deletions(-)
> 
> diff --git a/fs/xfs/xfs_file.c b/fs/xfs/xfs_file.c
> index 9ea08326f876..18edf04811d0 100644
> --- a/fs/xfs/xfs_file.c
> +++ b/fs/xfs/xfs_file.c
> @@ -768,7 +768,7 @@ xfs_file_fallocate(
>  	struct xfs_inode	*ip = XFS_I(inode);
>  	long			error;
>  	enum xfs_prealloc_flags	flags = 0;
> -	uint			iolock = XFS_IOLOCK_EXCL;
> +	uint			iolock = XFS_IOLOCK_EXCL | XFS_MMAPLOCK_EXCL;
>  	loff_t			new_size = 0;
>  	bool			do_file_insert = false;
>  
> @@ -782,9 +782,6 @@ xfs_file_fallocate(
>  	if (error)
>  		goto out_unlock;
>  
> -	xfs_ilock(ip, XFS_MMAPLOCK_EXCL);
> -	iolock |= XFS_MMAPLOCK_EXCL;
> -
>  	if (mode & FALLOC_FL_PUNCH_HOLE) {
>  		error = xfs_free_file_space(ip, offset, len);
>  		if (error)
> diff --git a/fs/xfs/xfs_ioctl.c b/fs/xfs/xfs_ioctl.c
> index 89fb1eb80aae..4151fade4bb1 100644
> --- a/fs/xfs/xfs_ioctl.c
> +++ b/fs/xfs/xfs_ioctl.c
> @@ -614,7 +614,7 @@ xfs_ioc_space(
>  	struct xfs_inode	*ip = XFS_I(inode);
>  	struct iattr		iattr;
>  	enum xfs_prealloc_flags	flags = 0;
> -	uint			iolock = XFS_IOLOCK_EXCL;
> +	uint			iolock = XFS_IOLOCK_EXCL | XFS_MMAPLOCK_EXCL;
>  	int			error;
>  
>  	/*
> @@ -648,9 +648,6 @@ xfs_ioc_space(
>  	if (error)
>  		goto out_unlock;
>  
> -	xfs_ilock(ip, XFS_MMAPLOCK_EXCL);
> -	iolock |= XFS_MMAPLOCK_EXCL;
> -
>  	switch (bf->l_whence) {
>  	case 0: /*SEEK_SET*/
>  		break;
> diff --git a/fs/xfs/xfs_iops.c b/fs/xfs/xfs_iops.c
> index 951e84df5576..d23aa08426f9 100644
> --- a/fs/xfs/xfs_iops.c
> +++ b/fs/xfs/xfs_iops.c
> @@ -1028,13 +1028,17 @@ xfs_vn_setattr(
>  
>  	if (iattr->ia_valid & ATTR_SIZE) {
>  		struct xfs_inode	*ip = XFS_I(d_inode(dentry));
> -		uint			iolock = XFS_IOLOCK_EXCL;
> +		uint			iolock;
> +
> +		xfs_ilock(ip, XFS_MMAPLOCK_EXCL);
> +		iolock = XFS_IOLOCK_EXCL | XFS_MMAPLOCK_EXCL;
>  
>  		error = xfs_break_layouts(d_inode(dentry), &iolock);
> -		if (error)
> +		if (error) {
> +			xfs_iunlock(ip, XFS_MMAPLOCK_EXCL);
>  			return error;
> +		}
>  
> -		xfs_ilock(ip, XFS_MMAPLOCK_EXCL);
>  		error = xfs_vn_setattr_size(dentry, iattr);
>  		xfs_iunlock(ip, XFS_MMAPLOCK_EXCL);
>  	} else {
> diff --git a/fs/xfs/xfs_pnfs.c b/fs/xfs/xfs_pnfs.c
> index aa6c5c193f45..6ea7b0b55d02 100644
> --- a/fs/xfs/xfs_pnfs.c
> +++ b/fs/xfs/xfs_pnfs.c
> @@ -43,7 +43,8 @@ xfs_break_layouts(
>  	while ((error = break_layout(inode, false) == -EWOULDBLOCK)) {
>  		xfs_iunlock(ip, *iolock);
>  		error = break_layout(inode, true);
> -		*iolock = XFS_IOLOCK_EXCL;
> +		*iolock &= ~XFS_IOLOCK_SHARED;
> +		*iolock |= XFS_IOLOCK_EXCL;
>  		xfs_ilock(ip, *iolock);
>  	}
>  
> 
> --
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  parent reply	other threads:[~2018-03-30 15:17 UTC|newest]

Thread overview: 37+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-03-21 22:57 [PATCH v7 00/14] dax: fix dma vs truncate/hole-punch Dan Williams
2018-03-21 22:57 ` [PATCH v7 01/14] dax: store pfns in the radix Dan Williams
2018-03-21 22:57 ` [PATCH v7 02/14] fs, dax: prepare for dax-specific address_space_operations Dan Williams
2018-03-29 15:28   ` Jan Kara
2018-03-21 22:57 ` [PATCH v7 03/14] block, dax: remove dead code in blkdev_writepages() Dan Williams
2018-03-29 15:29   ` Jan Kara
2018-03-21 22:57 ` [PATCH v7 04/14] xfs, dax: introduce xfs_dax_aops Dan Williams
2018-03-29 15:30   ` Jan Kara
2018-03-21 22:57 ` [PATCH v7 05/14] ext4, dax: introduce ext4_dax_aops Dan Williams
2018-03-29 15:40   ` Jan Kara
2018-03-29 18:09     ` Christoph Hellwig
2018-03-29 22:47       ` Dan Williams
2018-03-21 22:57 ` [PATCH v7 06/14] ext2, dax: introduce ext2_dax_aops Dan Williams
2018-03-29 15:44   ` Jan Kara
2018-03-21 22:57 ` [PATCH v7 07/14] fs, dax: use page->mapping to warn if truncate collides with a busy page Dan Williams
2018-03-29 16:02   ` Jan Kara
2018-03-29 19:02     ` Dan Williams
2018-03-29 23:02     ` Dan Williams
2018-03-30  8:22       ` Jan Kara
2018-03-21 22:57 ` [PATCH v7 08/14] mm, dax: enable filesystems to trigger dev_pagemap ->page_free callbacks Dan Williams
2018-03-29 16:36   ` Jan Kara
2018-03-21 22:57 ` [PATCH v7 09/14] mm, dev_pagemap: introduce CONFIG_DEV_PAGEMAP_OPS Dan Williams
2018-03-22  7:49   ` Christoph Hellwig
2018-03-30 10:37   ` Jan Kara
2018-03-21 22:58 ` [PATCH v7 10/14] memremap: mark devm_memremap_pages() EXPORT_SYMBOL_GPL Dan Williams
2018-03-22  7:51   ` Christoph Hellwig
2018-03-21 22:58 ` [PATCH v7 11/14] mm, fs, dax: handle layout changes to pinned dax mappings Dan Williams
2018-03-21 22:58 ` [PATCH v7 12/14] xfs: prepare xfs_break_layouts() to be called with XFS_MMAPLOCK_EXCL Dan Williams
2018-03-22  7:25   ` Christoph Hellwig
2018-03-30 15:16   ` Darrick J. Wong [this message]
2018-03-21 22:58 ` [PATCH v7 13/14] xfs: prepare xfs_break_layouts() for another layout type Dan Williams
2018-03-22  7:27   ` Christoph Hellwig
2018-03-22 15:50     ` Dan Williams
2018-03-21 22:58 ` [PATCH v7 14/14] xfs, dax: introduce xfs_break_dax_layouts() Dan Williams
2018-03-22  7:43   ` Christoph Hellwig
2018-03-22 16:28     ` Dan Williams
2018-03-22 17:02       ` Christoph Hellwig

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