diff options
| -rw-r--r-- | fs/iomap/buffered-io.c | 9 |
1 files changed, 6 insertions, 3 deletions
diff --git a/fs/iomap/buffered-io.c b/fs/iomap/buffered-io.c index c82b5b24d4b3..17449ea13420 100644 --- a/fs/iomap/buffered-io.c +++ b/fs/iomap/buffered-io.c @@ -758,9 +758,12 @@ static int __iomap_write_begin(const struct iomap_iter *iter, if (plen == 0) break; - if (!(iter->flags & IOMAP_UNSHARE) && - (from <= poff || from >= poff + plen) && - (to <= poff || to >= poff + plen)) + /* + * If the read range will be entirely overwritten by the write, + * we can skip having to zero/read it in. + */ + if (!(iter->flags & IOMAP_UNSHARE) && from <= poff && + to >= poff + plen) continue; if (iomap_block_needs_zeroing(iter, block_start)) { |