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authorChristoph Hellwig <hch@lst.de>2019-02-18 20:38:47 +0300
committerDarrick J. Wong <darrick.wong@oracle.com>2019-02-21 18:55:07 +0300
commitdb46e604adf8c923214a63b46e87ca2411d3d580 (patch)
treeec4797241a36cc5dc9d2b0d8fb466d8bc98f1bc1 /fs/xfs/xfs_reflink.c
parent12df89f28fa92e54bfb2ae01f9ee059e74e1acc0 (diff)
downloadlinux-db46e604adf8c923214a63b46e87ca2411d3d580.tar.xz
xfs: merge COW handling into xfs_file_iomap_begin_delay
Besides simplifying the code a bit this allows to actually implement the behavior of using COW preallocation for non-COW data mentioned in the current comments. 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>
Diffstat (limited to 'fs/xfs/xfs_reflink.c')
-rw-r--r--fs/xfs/xfs_reflink.c67
1 files changed, 0 insertions, 67 deletions
diff --git a/fs/xfs/xfs_reflink.c b/fs/xfs/xfs_reflink.c
index 8a5353daf9ab..9ef1f79cb3ae 100644
--- a/fs/xfs/xfs_reflink.c
+++ b/fs/xfs/xfs_reflink.c
@@ -234,73 +234,6 @@ xfs_reflink_trim_around_shared(
}
}
-/*
- * Trim the passed in imap to the next shared/unshared extent boundary, and
- * if imap->br_startoff points to a shared extent reserve space for it in the
- * COW fork.
- *
- * Note that imap will always contain the block numbers for the existing blocks
- * in the data fork, as the upper layers need them for read-modify-write
- * operations.
- */
-int
-xfs_reflink_reserve_cow(
- struct xfs_inode *ip,
- struct xfs_bmbt_irec *imap)
-{
- struct xfs_ifork *ifp = XFS_IFORK_PTR(ip, XFS_COW_FORK);
- struct xfs_bmbt_irec got;
- int error = 0;
- bool eof = false;
- struct xfs_iext_cursor icur;
- bool shared;
-
- /*
- * Search the COW fork extent list first. This serves two purposes:
- * first this implement the speculative preallocation using cowextisze,
- * so that we also unshared block adjacent to shared blocks instead
- * of just the shared blocks themselves. Second the lookup in the
- * extent list is generally faster than going out to the shared extent
- * tree.
- */
-
- if (!xfs_iext_lookup_extent(ip, ifp, imap->br_startoff, &icur, &got))
- eof = true;
- if (!eof && got.br_startoff <= imap->br_startoff) {
- trace_xfs_reflink_cow_found(ip, imap);
- xfs_trim_extent(imap, got.br_startoff, got.br_blockcount);
- return 0;
- }
-
- /* Trim the mapping to the nearest shared extent boundary. */
- error = xfs_reflink_trim_around_shared(ip, imap, &shared);
- if (error)
- return error;
-
- /* Not shared? Just report the (potentially capped) extent. */
- if (!shared)
- return 0;
-
- /*
- * Fork all the shared blocks from our write offset until the end of
- * the extent.
- */
- error = xfs_qm_dqattach_locked(ip, false);
- if (error)
- return error;
-
- error = xfs_bmapi_reserve_delalloc(ip, XFS_COW_FORK, imap->br_startoff,
- imap->br_blockcount, 0, &got, &icur, eof);
- if (error == -ENOSPC || error == -EDQUOT)
- trace_xfs_reflink_cow_enospc(ip, imap);
- if (error)
- return error;
-
- xfs_trim_extent(imap, got.br_startoff, got.br_blockcount);
- trace_xfs_reflink_cow_alloc(ip, &got);
- return 0;
-}
-
/* Convert part of an unwritten CoW extent to a real one. */
STATIC int
xfs_reflink_convert_cow_extent(