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iomap: use a srcmap for a read-modify-write I/O

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The srcmap is used to identify where the read is to be performed from.
It is passed to ->iomap_begin, which can fill it in if we need to read
data for partially written blocks from a different location than the
write target.  The srcmap is only supported for buffered writes so far.

Signed-off-by: Goldwyn Rodrigues <rgoldwyn@suse.com>
[hch: merged two patches, removed the IOMAP_F_COW flag, use iomap as
      srcmap if not set, adjust length down to srcmap end as well]
Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Darrick J. Wong <darrick.wong@oracle.com>
Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
Acked-by: Goldwyn Rodrigues <rgoldwyn@suse.com>
This commit is contained in:
Goldwyn Rodrigues
2019-10-18 16:44:10 -07:00
committed by Darrick J. Wong
parent eb81cf9d0e
commit c039b99792
12 changed files with 82 additions and 55 deletions
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9
fs/xfs/xfs_iomap.c
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@@ -928,7 +928,8 @@ xfs_file_iomap_begin(
loff_t offset,
loff_t length,
unsigned flags,
struct iomap *iomap)
struct iomap *iomap,
struct iomap *srcmap)
{
struct xfs_inode *ip = XFS_I(inode);
struct xfs_mount *mp = ip->i_mount;
@@ -1161,7 +1162,8 @@ xfs_seek_iomap_begin(
loff_t offset,
loff_t length,
unsigned flags,
struct iomap *iomap)
struct iomap *iomap,
struct iomap *srcmap)
{
struct xfs_inode *ip = XFS_I(inode);
struct xfs_mount *mp = ip->i_mount;
@@ -1247,7 +1249,8 @@ xfs_xattr_iomap_begin(
loff_t offset,
loff_t length,
unsigned flags,
struct iomap *iomap)
struct iomap *iomap,
struct iomap *srcmap)
{
struct xfs_inode *ip = XFS_I(inode);
struct xfs_mount *mp = ip->i_mount;