Re: [PATCH 04/19] iomap: ignore non-shared or non-data blocks in xfs_file_dirty

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

 



On Mon, Sep 09, 2019 at 08:27:07PM +0200, Christoph Hellwig wrote:
> xfs_file_dirty is used to unshare reflink blocks.  Rename the function
> to xfs_file_unshare to better document that purpose, and skip iomaps
> that are not shared are don't need zeroing.  This will allow to simplify

                      ^^^ "and"

> the caller.
> 
> Signed-off-by: Christoph Hellwig <hch@xxxxxx>

Otherwise this looks ok,
Reviewed-by: Darrick J. Wong <darrick.wong@xxxxxxxxxx>

--D

> ---
>  fs/iomap/buffered-io.c | 15 +++++++++++----
>  fs/xfs/xfs_reflink.c   |  2 +-
>  include/linux/iomap.h  |  2 +-
>  3 files changed, 13 insertions(+), 6 deletions(-)
> 
> diff --git a/fs/iomap/buffered-io.c b/fs/iomap/buffered-io.c
> index 33e03992d8a7..0b05551d9b5a 100644
> --- a/fs/iomap/buffered-io.c
> +++ b/fs/iomap/buffered-io.c
> @@ -872,12 +872,19 @@ __iomap_read_page(struct inode *inode, loff_t offset)
>  }
>  
>  static loff_t
> -iomap_dirty_actor(struct inode *inode, loff_t pos, loff_t length, void *data,
> +iomap_unshare_actor(struct inode *inode, loff_t pos, loff_t length, void *data,
>  		struct iomap *iomap)
>  {
>  	long status = 0;
>  	ssize_t written = 0;
>  
> +	/* don't bother with blocks that are not shared to start with */
> +	if (!(iomap->flags & IOMAP_F_SHARED))
> +		return length;
> +	/* don't bother with holes or unwritten extents */
> +	if (iomap->type == IOMAP_HOLE || iomap->type == IOMAP_UNWRITTEN)
> +		return length;
> +
>  	do {
>  		struct page *page, *rpage;
>  		unsigned long offset;	/* Offset into pagecache page */
> @@ -917,14 +924,14 @@ iomap_dirty_actor(struct inode *inode, loff_t pos, loff_t length, void *data,
>  }
>  
>  int
> -iomap_file_dirty(struct inode *inode, loff_t pos, loff_t len,
> +iomap_file_unshare(struct inode *inode, loff_t pos, loff_t len,
>  		const struct iomap_ops *ops)
>  {
>  	loff_t ret;
>  
>  	while (len) {
>  		ret = iomap_apply(inode, pos, len, IOMAP_WRITE, ops, NULL,
> -				iomap_dirty_actor);
> +				iomap_unshare_actor);
>  		if (ret <= 0)
>  			return ret;
>  		pos += ret;
> @@ -933,7 +940,7 @@ iomap_file_dirty(struct inode *inode, loff_t pos, loff_t len,
>  
>  	return 0;
>  }
> -EXPORT_SYMBOL_GPL(iomap_file_dirty);
> +EXPORT_SYMBOL_GPL(iomap_file_unshare);
>  
>  static int iomap_zero(struct inode *inode, loff_t pos, unsigned offset,
>  		unsigned bytes, struct iomap *iomap)
> diff --git a/fs/xfs/xfs_reflink.c b/fs/xfs/xfs_reflink.c
> index c4ec7afd1170..cadc0456804d 100644
> --- a/fs/xfs/xfs_reflink.c
> +++ b/fs/xfs/xfs_reflink.c
> @@ -1442,7 +1442,7 @@ xfs_reflink_dirty_extents(
>  			flen = XFS_FSB_TO_B(mp, rlen);
>  			if (fpos + flen > isize)
>  				flen = isize - fpos;
> -			error = iomap_file_dirty(VFS_I(ip), fpos, flen,
> +			error = iomap_file_unshare(VFS_I(ip), fpos, flen,
>  					&xfs_iomap_ops);
>  			xfs_ilock(ip, XFS_ILOCK_EXCL);
>  			if (error)
> diff --git a/include/linux/iomap.h b/include/linux/iomap.h
> index 8adcc8dd4498..3a0f0975a57e 100644
> --- a/include/linux/iomap.h
> +++ b/include/linux/iomap.h
> @@ -183,7 +183,7 @@ int iomap_migrate_page(struct address_space *mapping, struct page *newpage,
>  #else
>  #define iomap_migrate_page NULL
>  #endif
> -int iomap_file_dirty(struct inode *inode, loff_t pos, loff_t len,
> +int iomap_file_unshare(struct inode *inode, loff_t pos, loff_t len,
>  		const struct iomap_ops *ops);
>  int iomap_zero_range(struct inode *inode, loff_t pos, loff_t len,
>  		bool *did_zero, const struct iomap_ops *ops);
> -- 
> 2.20.1
> 



[Index of Archives]     [Linux Ext4 Filesystem]     [Union Filesystem]     [Filesystem Testing]     [Ceph Users]     [Ecryptfs]     [AutoFS]     [Kernel Newbies]     [Share Photos]     [Security]     [Netfilter]     [Bugtraq]     [Yosemite News]     [MIPS Linux]     [ARM Linux]     [Linux Security]     [Linux Cachefs]     [Reiser Filesystem]     [Linux RAID]     [Samba]     [Device Mapper]     [CEPH Development]

  Powered by Linux