From ef4736678fc3ea426968bc82f907798ed5f51e85 Mon Sep 17 00:00:00 2001 From: "Darrick J. Wong" Date: Mon, 3 Oct 2016 09:11:34 -0700 Subject: xfs: allocate delayed extents in CoW fork Modify the writepage handler to find and convert pending delalloc extents to real allocations. Furthermore, when we're doing non-cow writes to a part of a file that already has a CoW reservation (the cowextsz hint that we set up in a subsequent patch facilitates this), promote the write to copy-on-write so that the entire extent can get written out as a single extent on disk, thereby reducing post-CoW fragmentation. Christoph moved the CoW support code in _map_blocks to a separate helper function, refactored other functions, and reduced the number of CoW fork lookups, so I merged those changes here to reduce churn. Signed-off-by: Darrick J. Wong Signed-off-by: Christoph Hellwig --- fs/xfs/xfs_reflink.h | 4 ++++ 1 file changed, 4 insertions(+) (limited to 'fs/xfs/xfs_reflink.h') diff --git a/fs/xfs/xfs_reflink.h b/fs/xfs/xfs_reflink.h index f824f874234f..11408c0f3415 100644 --- a/fs/xfs/xfs_reflink.h +++ b/fs/xfs/xfs_reflink.h @@ -28,5 +28,9 @@ extern int xfs_reflink_trim_around_shared(struct xfs_inode *ip, extern int xfs_reflink_reserve_cow_range(struct xfs_inode *ip, xfs_off_t offset, xfs_off_t count); +extern bool xfs_reflink_find_cow_mapping(struct xfs_inode *ip, xfs_off_t offset, + struct xfs_bmbt_irec *imap, bool *need_alloc); +extern int xfs_reflink_trim_irec_to_next_cow(struct xfs_inode *ip, + xfs_fileoff_t offset_fsb, struct xfs_bmbt_irec *imap); #endif /* __XFS_REFLINK_H */ -- cgit v1.2.3