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| author | Christoph Hellwig <hch@lst.de> | 2016-10-20 15:53:32 +1100 |
|---|---|---|
| committer | Dave Chinner <david@fromorbit.com> | 2016-10-20 15:53:32 +1100 |
| commit | 5f9268ca53aca992106d74edde3e7cf6c1be60a0 (patch) | |
| tree | d7bbd9ab08f2fde333d67cdc20dbb126ca0bf56e /fs | |
| parent | 62c5ac89de7d5eecdbaa94ca3d554b0bd41578b1 (diff) | |
| download | linux-5f9268ca53aca992106d74edde3e7cf6c1be60a0.tar.gz linux-5f9268ca53aca992106d74edde3e7cf6c1be60a0.tar.bz2 linux-5f9268ca53aca992106d74edde3e7cf6c1be60a0.zip | |
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>
Diffstat (limited to 'fs')
| -rw-r--r-- | fs/xfs/xfs_iomap.c | 13 |
1 files changed, 8 insertions, 5 deletions
diff --git a/fs/xfs/xfs_iomap.c b/fs/xfs/xfs_iomap.c index d907eb9f8ef3..1dabf2eb136a 100644 --- a/fs/xfs/xfs_iomap.c +++ b/fs/xfs/xfs_iomap.c @@ -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)) { |