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| author |   Darrick J. Wong <darrick.wong@oracle.com> | 2016-10-03 09:11:34 -0700 |
|---|---|---|
| committer | Darrick J. Wong <darrick.wong@oracle.com> | 2016-10-04 18:06:41 -0700 |
| commit | ef4736678fc3ea426968bc82f907798ed5f51e85 (patch) | |
| tree | 8a1525ef991d72cf833030e0ff081a91f27cbeed /fs/xfs/xfs_reflink.h | |
| parent | xfs: support allocating delayed extents in CoW fork (diff) | |
| download | linux-dev-ef4736678fc3ea426968bc82f907798ed5f51e85.tar.xz linux-dev-ef4736678fc3ea426968bc82f907798ed5f51e85.zip | |
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.h | 4 |
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 */ |