diff options
Diffstat (limited to 'fs/iomap/buffered-io.c')
| -rw-r--r-- | fs/iomap/buffered-io.c | 30 |
1 files changed, 16 insertions, 14 deletions
diff --git a/fs/iomap/buffered-io.c b/fs/iomap/buffered-io.c index 78ebd265f425..3899169b2cf7 100644 --- a/fs/iomap/buffered-io.c +++ b/fs/iomap/buffered-io.c @@ -1309,19 +1309,12 @@ void iomap_file_buffered_write_punch_delalloc(struct inode *inode, } EXPORT_SYMBOL_GPL(iomap_file_buffered_write_punch_delalloc); -static loff_t iomap_unshare_iter(struct iomap_iter *iter) +bool iomap_want_unshare_iter(const struct iomap_iter *iter) { - struct iomap *iomap = &iter->iomap; - loff_t pos = iter->pos; - loff_t length = iomap_length(iter); - loff_t written = 0; - - /* Don't bother with blocks that are not shared to start with. */ - if (!(iomap->flags & IOMAP_F_SHARED)) - return length; - /* - * Don't bother with delalloc reservations, holes or unwritten extents. + * Don't bother with blocks that are not shared to start with; or + * mappings that cannot be shared, such as inline data, delalloc + * reservations, holes or unwritten extents. * * Note that we use srcmap directly instead of iomap_iter_srcmap as * unsharing requires providing a separate source map, and the presence @@ -1329,9 +1322,18 @@ static loff_t iomap_unshare_iter(struct iomap_iter *iter) * IOMAP_F_SHARED which can be set for any data that goes into the COW * fork for XFS. */ - if (iter->srcmap.type == IOMAP_HOLE || - iter->srcmap.type == IOMAP_DELALLOC || - iter->srcmap.type == IOMAP_UNWRITTEN) + return (iter->iomap.flags & IOMAP_F_SHARED) && + iter->srcmap.type == IOMAP_MAPPED; +} + +static loff_t iomap_unshare_iter(struct iomap_iter *iter) +{ + struct iomap *iomap = &iter->iomap; + loff_t pos = iter->pos; + loff_t length = iomap_length(iter); + loff_t written = 0; + + if (!iomap_want_unshare_iter(iter)) return length; do { |