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xfs: simplify xfs_reflink_convert_cow

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Instead of looking up extents to convert and calling xfs_bmapi_write on
each of them just let xfs_bmapi_write handle the full range.  To make
this robust add a new XFS_BMAPI_CONVERT_ONLY that only converts ranges
and never allocates blocks.

[darrick: shorten the stringified CONVERT_ONLY trace flag]

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>
This commit is contained in:
Christoph Hellwig
2017-11-03 10:34:44 -07:00
committed by Darrick J. Wong
parent 41caabd0ab
commit b121459c7a
3 changed files with 18 additions and 20 deletions
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3
fs/xfs/libxfs/xfs_bmap.c
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@@ -4331,7 +4331,8 @@ xfs_bmapi_write(
* First, deal with the hole before the allocated space
* that we found, if any.
*/
if (need_alloc || wasdelay) {
if ((need_alloc || wasdelay) &&
!(flags & XFS_BMAPI_CONVERT_ONLY)) {
bma.eof = eof;
bma.conv = !!(flags & XFS_BMAPI_CONVERT);
bma.wasdel = wasdelay;