xfs: rework breaking of shared extents in xfs_file_iomap_begin
Rework the data flow in xfs_file_iomap_begin where we decide if we have to break shared extents. Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com> Reviewed-by: Brian Foster <bfoster@redhat.com>
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@ -982,7 +982,7 @@ xfs_file_iomap_begin(
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* been done up front, so we don't need to do them here.
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*/
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if (xfs_is_cow_inode(ip)) {
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struct xfs_bmbt_irec orig = imap;
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struct xfs_bmbt_irec cmap;
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bool directio = (flags & IOMAP_DIRECT);
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/* if zeroing doesn't need COW allocation, then we are done. */
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@ -991,7 +991,8 @@ xfs_file_iomap_begin(
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goto out_found;
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/* may drop and re-acquire the ilock */
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error = xfs_reflink_allocate_cow(ip, &imap, &shared, &lockmode,
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cmap = imap;
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error = xfs_reflink_allocate_cow(ip, &cmap, &shared, &lockmode,
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directio);
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if (error)
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goto out_unlock;
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@ -1002,10 +1003,11 @@ xfs_file_iomap_begin(
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* write code can perform read-modify-write operations; we
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* won't need the CoW fork mapping until writeback. For direct
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* I/O, which must be block aligned, we need to report the
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* newly allocated address.
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* newly allocated address. If the data fork has a hole, copy
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* the COW fork mapping to avoid allocating to the data fork.
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*/
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if (!directio && orig.br_startblock != HOLESTARTBLOCK)
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imap = orig;
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if (directio || imap.br_startblock == HOLESTARTBLOCK)
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imap = cmap;
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end_fsb = imap.br_startoff + imap.br_blockcount;
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length = XFS_FSB_TO_B(mp, end_fsb) - offset;
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