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xfs: don't bother looking at the refcount tree for reads 

There is no need to trim an extent into a shared or non-shared one, or
report any flags for plain old reads.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Darrick J. Wong <darrick.wong@oracle.com>
Reviewed-by: Brian Foster <bfoster@redhat.com>
Signed-off-by: Dave Chinner <david@fromorbit.com>
This commit is contained in:
Christoph Hellwig 2016-10-20 15:53:32 +11:00 committed by Dave Chinner
parent 62c5ac89de
commit 5f9268ca53
1 changed files with 8 additions and 5 deletions
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13
fs/xfs/xfs_iomap.c
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@ -996,11 +996,14 @@ xfs_file_iomap_begin(
return error;
}
/* Trim the mapping to the nearest shared extent boundary. */
error = xfs_reflink_trim_around_shared(ip, &imap, &shared, &trimmed);
if (error) {
xfs_iunlock(ip, lockmode);
return error;
if (flags & (IOMAP_WRITE | IOMAP_ZERO | IOMAP_REPORT)) {
/* Trim the mapping to the nearest shared extent boundary. */
error = xfs_reflink_trim_around_shared(ip, &imap, &shared,
&trimmed);
if (error) {
xfs_iunlock(ip, lockmode);
return error;
}
}
if ((flags & IOMAP_WRITE) && imap_needs_alloc(inode, &imap, nimaps)) {