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authorDarrick J. Wong <darrick.wong@oracle.com>2016-10-03 19:11:34 +0300
committerDarrick J. Wong <darrick.wong@oracle.com>2016-10-05 04:06:41 +0300
commitef4736678fc3ea426968bc82f907798ed5f51e85 (patch)
tree8a1525ef991d72cf833030e0ff081a91f27cbeed /fs/xfs/xfs_reflink.h
parent60b4984fc3924bff292ec46b95a3e98b34b8e259 (diff)
downloadlinux-ef4736678fc3ea426968bc82f907798ed5f51e85.tar.xz
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 <darrick.wong@oracle.com> Signed-off-by: Christoph Hellwig <hch@lst.de>
Diffstat (limited to 'fs/xfs/xfs_reflink.h')
-rw-r--r--fs/xfs/xfs_reflink.h4
1 files changed, 4 insertions, 0 deletions
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 */