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xfs: introduce xfs_aligned_fsb_count

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Factor a helper to calculate the extent-size aligned block out of the
iomap code, so that it can be reused by the upcoming reflink dio code.

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
2017-02-06 10:42:26 -08:00
committed by Darrick J. Wong
parent 54a4ef8af4
commit f13eb2055a
2 changed files with 22 additions and 9 deletions
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11
fs/xfs/xfs_iomap.c
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@@ -162,7 +162,7 @@ xfs_iomap_write_direct(
xfs_fileoff_t last_fsb;
xfs_filblks_t count_fsb, resaligned;
xfs_fsblock_t firstfsb;
xfs_extlen_t extsz, temp;
xfs_extlen_t extsz;
int nimaps;
int quota_flag;
int rt;
@@ -203,14 +203,7 @@ xfs_iomap_write_direct(
}
count_fsb = last_fsb - offset_fsb;
ASSERT(count_fsb > 0);
resaligned = count_fsb;
if (unlikely(extsz)) {
if ((temp = do_mod(offset_fsb, extsz)))
resaligned += temp;
if ((temp = do_mod(resaligned, extsz)))
resaligned += extsz - temp;
}
resaligned = xfs_aligned_fsb_count(offset_fsb, count_fsb, extsz);
if (unlikely(rt)) {
resrtextents = qblocks = resaligned;