diff mbox series

[14/19] xfs: split out a new set of read-only iomap ops

Message ID 20190909182722.16783-15-hch@lst.de (mailing list archive)
State Superseded, archived
Headers show
Series [01/19] iomap: better document the IOMAP_F_* flags | expand

Commit Message

Christoph Hellwig Sept. 9, 2019, 6:27 p.m. UTC 
Start untangling xfs_file_iomap_begin by splitting out the read-only
case into its own set of iomap_ops with a very simply iomap_begin
helper.

Signed-off-by: Christoph Hellwig <hch@lst.de>
---
 fs/xfs/xfs_aops.c  |  9 ++++---
 fs/xfs/xfs_file.c  |  8 +++---
 fs/xfs/xfs_iomap.c | 61 ++++++++++++++++++++++++++++++++++------------
 fs/xfs/xfs_iomap.h |  1 +
 fs/xfs/xfs_iops.c  |  2 +-
 5 files changed, 58 insertions(+), 23 deletions(-)

Comments

Darrick J. Wong Sept. 18, 2019, 5:56 p.m. UTC | #1 
On Mon, Sep 09, 2019 at 08:27:17PM +0200, Christoph Hellwig wrote:
> Start untangling xfs_file_iomap_begin by splitting out the read-only
> case into its own set of iomap_ops with a very simply iomap_begin
> helper.
> 
> Signed-off-by: Christoph Hellwig <hch@lst.de>

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

--D

> ---
>  fs/xfs/xfs_aops.c  |  9 ++++---
>  fs/xfs/xfs_file.c  |  8 +++---
>  fs/xfs/xfs_iomap.c | 61 ++++++++++++++++++++++++++++++++++------------
>  fs/xfs/xfs_iomap.h |  1 +
>  fs/xfs/xfs_iops.c  |  2 +-
>  5 files changed, 58 insertions(+), 23 deletions(-)
> 
> diff --git a/fs/xfs/xfs_aops.c b/fs/xfs/xfs_aops.c
> index 4e4a4d7df5ac..fe47a4d52247 100644
> --- a/fs/xfs/xfs_aops.c
> +++ b/fs/xfs/xfs_aops.c
> @@ -1158,7 +1158,7 @@ xfs_vm_bmap(
>  	 */
>  	if (xfs_is_cow_inode(ip) || XFS_IS_REALTIME_INODE(ip))
>  		return 0;
> -	return iomap_bmap(mapping, block, &xfs_iomap_ops);
> +	return iomap_bmap(mapping, block, &xfs_read_iomap_ops);
>  }
>  
>  STATIC int
> @@ -1167,7 +1167,7 @@ xfs_vm_readpage(
>  	struct page		*page)
>  {
>  	trace_xfs_vm_readpage(page->mapping->host, 1);
> -	return iomap_readpage(page, &xfs_iomap_ops);
> +	return iomap_readpage(page, &xfs_read_iomap_ops);
>  }
>  
>  STATIC int
> @@ -1178,7 +1178,7 @@ xfs_vm_readpages(
>  	unsigned		nr_pages)
>  {
>  	trace_xfs_vm_readpages(mapping->host, nr_pages);
> -	return iomap_readpages(mapping, pages, nr_pages, &xfs_iomap_ops);
> +	return iomap_readpages(mapping, pages, nr_pages, &xfs_read_iomap_ops);
>  }
>  
>  static int
> @@ -1188,7 +1188,8 @@ xfs_iomap_swapfile_activate(
>  	sector_t			*span)
>  {
>  	sis->bdev = xfs_find_bdev_for_inode(file_inode(swap_file));
> -	return iomap_swapfile_activate(sis, swap_file, span, &xfs_iomap_ops);
> +	return iomap_swapfile_activate(sis, swap_file, span,
> +			&xfs_read_iomap_ops);
>  }
>  
>  const struct address_space_operations xfs_address_space_operations = {
> diff --git a/fs/xfs/xfs_file.c b/fs/xfs/xfs_file.c
> index 21bd3d575aaa..d8e2e36b84f7 100644
> --- a/fs/xfs/xfs_file.c
> +++ b/fs/xfs/xfs_file.c
> @@ -187,7 +187,7 @@ xfs_file_dio_aio_read(
>  	file_accessed(iocb->ki_filp);
>  
>  	xfs_ilock(ip, XFS_IOLOCK_SHARED);
> -	ret = iomap_dio_rw(iocb, to, &xfs_iomap_ops, NULL);
> +	ret = iomap_dio_rw(iocb, to, &xfs_read_iomap_ops, NULL);
>  	xfs_iunlock(ip, XFS_IOLOCK_SHARED);
>  
>  	return ret;
> @@ -214,7 +214,7 @@ xfs_file_dax_read(
>  		xfs_ilock(ip, XFS_IOLOCK_SHARED);
>  	}
>  
> -	ret = dax_iomap_rw(iocb, to, &xfs_iomap_ops);
> +	ret = dax_iomap_rw(iocb, to, &xfs_read_iomap_ops);
>  	xfs_iunlock(ip, XFS_IOLOCK_SHARED);
>  
>  	file_accessed(iocb->ki_filp);
> @@ -1131,7 +1131,9 @@ __xfs_filemap_fault(
>  	if (IS_DAX(inode)) {
>  		pfn_t pfn;
>  
> -		ret = dax_iomap_fault(vmf, pe_size, &pfn, NULL, &xfs_iomap_ops);
> +		ret = dax_iomap_fault(vmf, pe_size, &pfn, NULL,
> +				(write_fault && !vmf->cow_page) ?
> +				 &xfs_iomap_ops : &xfs_read_iomap_ops);
>  		if (ret & VM_FAULT_NEEDDSYNC)
>  			ret = dax_finish_sync_fault(vmf, pe_size, pfn);
>  	} else {
> diff --git a/fs/xfs/xfs_iomap.c b/fs/xfs/xfs_iomap.c
> index 0ba67a8d8169..d0ed0cba9041 100644
> --- a/fs/xfs/xfs_iomap.c
> +++ b/fs/xfs/xfs_iomap.c
> @@ -950,11 +950,13 @@ xfs_file_iomap_begin(
>  	u16			iomap_flags = 0;
>  	unsigned		lockmode;
>  
> +	ASSERT(flags & (IOMAP_WRITE | IOMAP_ZERO));
> +
>  	if (XFS_FORCED_SHUTDOWN(mp))
>  		return -EIO;
>  
> -	if ((flags & (IOMAP_WRITE | IOMAP_ZERO)) && !(flags & IOMAP_DIRECT) &&
> -			!IS_DAX(inode) && !xfs_get_extsz_hint(ip)) {
> +	if (!(flags & IOMAP_DIRECT) && !IS_DAX(inode) &&
> +	    !xfs_get_extsz_hint(ip)) {
>  		/* Reserve delalloc blocks for regular writeback. */
>  		return xfs_file_iomap_begin_delay(inode, offset, length, flags,
>  				iomap, srcmap);
> @@ -975,17 +977,6 @@ xfs_file_iomap_begin(
>  	if (error)
>  		goto out_unlock;
>  
> -	if (flags & IOMAP_REPORT) {
> -		/* Trim the mapping to the nearest shared extent boundary. */
> -		error = xfs_reflink_trim_around_shared(ip, &imap, &shared);
> -		if (error)
> -			goto out_unlock;
> -	}
> -
> -	/* Non-modifying mapping requested, so we are done */
> -	if (!(flags & (IOMAP_WRITE | IOMAP_ZERO)))
> -		goto out_found;
> -
>  	/*
>  	 * Break shared extents if necessary. Checks for non-blocking IO have
>  	 * been done up front, so we don't need to do them here.
> @@ -1046,8 +1037,6 @@ xfs_file_iomap_begin(
>  	trace_xfs_iomap_alloc(ip, offset, length, XFS_DATA_FORK, &imap);
>  
>  out_finish:
> -	if (shared)
> -		iomap_flags |= IOMAP_F_SHARED;
>  	return xfs_bmbt_to_iomap(ip, iomap, &imap, iomap_flags);
>  
>  out_found:
> @@ -1150,6 +1139,48 @@ const struct iomap_ops xfs_iomap_ops = {
>  	.iomap_end		= xfs_file_iomap_end,
>  };
>  
> +static int
> +xfs_read_iomap_begin(
> +	struct inode		*inode,
> +	loff_t			offset,
> +	loff_t			length,
> +	unsigned		flags,
> +	struct iomap		*iomap,
> +	struct iomap		*srcmap)
> +{
> +	struct xfs_inode	*ip = XFS_I(inode);
> +	struct xfs_mount	*mp = ip->i_mount;
> +	struct xfs_bmbt_irec	imap;
> +	xfs_fileoff_t		offset_fsb = XFS_B_TO_FSBT(mp, offset);
> +	xfs_fileoff_t		end_fsb = xfs_iomap_end_fsb(mp, offset, length);
> +	int			nimaps = 1, error = 0;
> +	bool			shared = false;
> +	unsigned		lockmode;
> +
> +	ASSERT(!(flags & (IOMAP_WRITE | IOMAP_ZERO)));
> +
> +	if (XFS_FORCED_SHUTDOWN(mp))
> +		return -EIO;
> +
> +	error = xfs_ilock_for_iomap(ip, flags, &lockmode);
> +	if (error)
> +		return error;
> +	error = xfs_bmapi_read(ip, offset_fsb, end_fsb - offset_fsb, &imap,
> +			       &nimaps, 0);
> +	if (!error && (flags & IOMAP_REPORT))
> +		error = xfs_reflink_trim_around_shared(ip, &imap, &shared);
> +	xfs_iunlock(ip, lockmode);
> +
> +	if (error)
> +		return error;
> +	trace_xfs_iomap_found(ip, offset, length, XFS_DATA_FORK, &imap);
> +	return xfs_bmbt_to_iomap(ip, iomap, &imap, shared ? IOMAP_F_SHARED : 0);
> +}
> +
> +const struct iomap_ops xfs_read_iomap_ops = {
> +	.iomap_begin		= xfs_read_iomap_begin,
> +};
> +
>  static int
>  xfs_seek_iomap_begin(
>  	struct inode		*inode,
> diff --git a/fs/xfs/xfs_iomap.h b/fs/xfs/xfs_iomap.h
> index 71d0ae460c44..61b1fc3e5143 100644
> --- a/fs/xfs/xfs_iomap.h
> +++ b/fs/xfs/xfs_iomap.h
> @@ -40,6 +40,7 @@ xfs_aligned_fsb_count(
>  }
>  
>  extern const struct iomap_ops xfs_iomap_ops;
> +extern const struct iomap_ops xfs_read_iomap_ops;
>  extern const struct iomap_ops xfs_seek_iomap_ops;
>  extern const struct iomap_ops xfs_xattr_iomap_ops;
>  
> diff --git a/fs/xfs/xfs_iops.c b/fs/xfs/xfs_iops.c
> index ff3c1fae5357..f0c7df82e18b 100644
> --- a/fs/xfs/xfs_iops.c
> +++ b/fs/xfs/xfs_iops.c
> @@ -1113,7 +1113,7 @@ xfs_vn_fiemap(
>  				&xfs_xattr_iomap_ops);
>  	} else {
>  		error = iomap_fiemap(inode, fieinfo, start, length,
> -				&xfs_iomap_ops);
> +				&xfs_read_iomap_ops);
>  	}
>  	xfs_iunlock(XFS_I(inode), XFS_IOLOCK_SHARED);
>  
> -- 
> 2.20.1
>
diff mbox series

Patch

diff --git a/fs/xfs/xfs_aops.c b/fs/xfs/xfs_aops.c
index 4e4a4d7df5ac..fe47a4d52247 100644
--- a/fs/xfs/xfs_aops.c
+++ b/fs/xfs/xfs_aops.c
@@ -1158,7 +1158,7 @@  xfs_vm_bmap(
 	 */
 	if (xfs_is_cow_inode(ip) || XFS_IS_REALTIME_INODE(ip))
 		return 0;
-	return iomap_bmap(mapping, block, &xfs_iomap_ops);
+	return iomap_bmap(mapping, block, &xfs_read_iomap_ops);
 }
 
 STATIC int
@@ -1167,7 +1167,7 @@  xfs_vm_readpage(
 	struct page		*page)
 {
 	trace_xfs_vm_readpage(page->mapping->host, 1);
-	return iomap_readpage(page, &xfs_iomap_ops);
+	return iomap_readpage(page, &xfs_read_iomap_ops);
 }
 
 STATIC int
@@ -1178,7 +1178,7 @@  xfs_vm_readpages(
 	unsigned		nr_pages)
 {
 	trace_xfs_vm_readpages(mapping->host, nr_pages);
-	return iomap_readpages(mapping, pages, nr_pages, &xfs_iomap_ops);
+	return iomap_readpages(mapping, pages, nr_pages, &xfs_read_iomap_ops);
 }
 
 static int
@@ -1188,7 +1188,8 @@  xfs_iomap_swapfile_activate(
 	sector_t			*span)
 {
 	sis->bdev = xfs_find_bdev_for_inode(file_inode(swap_file));
-	return iomap_swapfile_activate(sis, swap_file, span, &xfs_iomap_ops);
+	return iomap_swapfile_activate(sis, swap_file, span,
+			&xfs_read_iomap_ops);
 }
 
 const struct address_space_operations xfs_address_space_operations = {
diff --git a/fs/xfs/xfs_file.c b/fs/xfs/xfs_file.c
index 21bd3d575aaa..d8e2e36b84f7 100644
--- a/fs/xfs/xfs_file.c
+++ b/fs/xfs/xfs_file.c
@@ -187,7 +187,7 @@  xfs_file_dio_aio_read(
 	file_accessed(iocb->ki_filp);
 
 	xfs_ilock(ip, XFS_IOLOCK_SHARED);
-	ret = iomap_dio_rw(iocb, to, &xfs_iomap_ops, NULL);
+	ret = iomap_dio_rw(iocb, to, &xfs_read_iomap_ops, NULL);
 	xfs_iunlock(ip, XFS_IOLOCK_SHARED);
 
 	return ret;
@@ -214,7 +214,7 @@  xfs_file_dax_read(
 		xfs_ilock(ip, XFS_IOLOCK_SHARED);
 	}
 
-	ret = dax_iomap_rw(iocb, to, &xfs_iomap_ops);
+	ret = dax_iomap_rw(iocb, to, &xfs_read_iomap_ops);
 	xfs_iunlock(ip, XFS_IOLOCK_SHARED);
 
 	file_accessed(iocb->ki_filp);
@@ -1131,7 +1131,9 @@  __xfs_filemap_fault(
 	if (IS_DAX(inode)) {
 		pfn_t pfn;
 
-		ret = dax_iomap_fault(vmf, pe_size, &pfn, NULL, &xfs_iomap_ops);
+		ret = dax_iomap_fault(vmf, pe_size, &pfn, NULL,
+				(write_fault && !vmf->cow_page) ?
+				 &xfs_iomap_ops : &xfs_read_iomap_ops);
 		if (ret & VM_FAULT_NEEDDSYNC)
 			ret = dax_finish_sync_fault(vmf, pe_size, pfn);
 	} else {
diff --git a/fs/xfs/xfs_iomap.c b/fs/xfs/xfs_iomap.c
index 0ba67a8d8169..d0ed0cba9041 100644
--- a/fs/xfs/xfs_iomap.c
+++ b/fs/xfs/xfs_iomap.c
@@ -950,11 +950,13 @@  xfs_file_iomap_begin(
 	u16			iomap_flags = 0;
 	unsigned		lockmode;
 
+	ASSERT(flags & (IOMAP_WRITE | IOMAP_ZERO));
+
 	if (XFS_FORCED_SHUTDOWN(mp))
 		return -EIO;
 
-	if ((flags & (IOMAP_WRITE | IOMAP_ZERO)) && !(flags & IOMAP_DIRECT) &&
-			!IS_DAX(inode) && !xfs_get_extsz_hint(ip)) {
+	if (!(flags & IOMAP_DIRECT) && !IS_DAX(inode) &&
+	    !xfs_get_extsz_hint(ip)) {
 		/* Reserve delalloc blocks for regular writeback. */
 		return xfs_file_iomap_begin_delay(inode, offset, length, flags,
 				iomap, srcmap);
@@ -975,17 +977,6 @@  xfs_file_iomap_begin(
 	if (error)
 		goto out_unlock;
 
-	if (flags & IOMAP_REPORT) {
-		/* Trim the mapping to the nearest shared extent boundary. */
-		error = xfs_reflink_trim_around_shared(ip, &imap, &shared);
-		if (error)
-			goto out_unlock;
-	}
-
-	/* Non-modifying mapping requested, so we are done */
-	if (!(flags & (IOMAP_WRITE | IOMAP_ZERO)))
-		goto out_found;
-
 	/*
 	 * Break shared extents if necessary. Checks for non-blocking IO have
 	 * been done up front, so we don't need to do them here.
@@ -1046,8 +1037,6 @@  xfs_file_iomap_begin(
 	trace_xfs_iomap_alloc(ip, offset, length, XFS_DATA_FORK, &imap);
 
 out_finish:
-	if (shared)
-		iomap_flags |= IOMAP_F_SHARED;
 	return xfs_bmbt_to_iomap(ip, iomap, &imap, iomap_flags);
 
 out_found:
@@ -1150,6 +1139,48 @@  const struct iomap_ops xfs_iomap_ops = {
 	.iomap_end		= xfs_file_iomap_end,
 };
 
+static int
+xfs_read_iomap_begin(
+	struct inode		*inode,
+	loff_t			offset,
+	loff_t			length,
+	unsigned		flags,
+	struct iomap		*iomap,
+	struct iomap		*srcmap)
+{
+	struct xfs_inode	*ip = XFS_I(inode);
+	struct xfs_mount	*mp = ip->i_mount;
+	struct xfs_bmbt_irec	imap;
+	xfs_fileoff_t		offset_fsb = XFS_B_TO_FSBT(mp, offset);
+	xfs_fileoff_t		end_fsb = xfs_iomap_end_fsb(mp, offset, length);
+	int			nimaps = 1, error = 0;
+	bool			shared = false;
+	unsigned		lockmode;
+
+	ASSERT(!(flags & (IOMAP_WRITE | IOMAP_ZERO)));
+
+	if (XFS_FORCED_SHUTDOWN(mp))
+		return -EIO;
+
+	error = xfs_ilock_for_iomap(ip, flags, &lockmode);
+	if (error)
+		return error;
+	error = xfs_bmapi_read(ip, offset_fsb, end_fsb - offset_fsb, &imap,
+			       &nimaps, 0);
+	if (!error && (flags & IOMAP_REPORT))
+		error = xfs_reflink_trim_around_shared(ip, &imap, &shared);
+	xfs_iunlock(ip, lockmode);
+
+	if (error)
+		return error;
+	trace_xfs_iomap_found(ip, offset, length, XFS_DATA_FORK, &imap);
+	return xfs_bmbt_to_iomap(ip, iomap, &imap, shared ? IOMAP_F_SHARED : 0);
+}
+
+const struct iomap_ops xfs_read_iomap_ops = {
+	.iomap_begin		= xfs_read_iomap_begin,
+};
+
 static int
 xfs_seek_iomap_begin(
 	struct inode		*inode,
diff --git a/fs/xfs/xfs_iomap.h b/fs/xfs/xfs_iomap.h
index 71d0ae460c44..61b1fc3e5143 100644
--- a/fs/xfs/xfs_iomap.h
+++ b/fs/xfs/xfs_iomap.h
@@ -40,6 +40,7 @@  xfs_aligned_fsb_count(
 }
 
 extern const struct iomap_ops xfs_iomap_ops;
+extern const struct iomap_ops xfs_read_iomap_ops;
 extern const struct iomap_ops xfs_seek_iomap_ops;
 extern const struct iomap_ops xfs_xattr_iomap_ops;
 
diff --git a/fs/xfs/xfs_iops.c b/fs/xfs/xfs_iops.c
index ff3c1fae5357..f0c7df82e18b 100644
--- a/fs/xfs/xfs_iops.c
+++ b/fs/xfs/xfs_iops.c
@@ -1113,7 +1113,7 @@  xfs_vn_fiemap(
 				&xfs_xattr_iomap_ops);
 	} else {
 		error = iomap_fiemap(inode, fieinfo, start, length,
-				&xfs_iomap_ops);
+				&xfs_read_iomap_ops);
 	}
 	xfs_iunlock(XFS_I(inode), XFS_IOLOCK_SHARED);