The original FIEMAP patch did not define this bit, btrfs will make use of it. The defined constant maintains the same value as originally proposed. Currently, the 'filefrag' utility has no way to recognize and denote a compressed extent. As implemented in btrfs right now, the compression step splits a big extent into smaller chunks and this is reported as a heavily fragmented file. Adding the flag to filefrag will at least give some explanation why, this has been confusing users for some time already. V2: Based on feedback from Andreas, the fiemap_extent is now able to hold the physical extent length, to be filled by the filesystem callback. The filesystems do not have access to the structure that is passed back to userspace and are supposed to call fiemap_fill_next_extent, there's no direct way to fill fe_phys_length. There are two ways to pass it: 1) extend fiemap_fill_next_extent to take phys_length and update all users (ext4, gfs2, ocfs2, nilfs2, xfs) 2) add new function that takes arguments for all the fiemap_extent items, newly added phys_length compared to fiemap_fill_next_extent This patchset implements 2, the footprint is smaller, no need to change filesystem that do not care about compression. David Sterba (3): fiemap: fix comment at EXTENT_DATA_ENCRYPTED fiemap: add EXTENT_DATA_COMPRESSED flag btrfs: set FIEMAP_EXTENT_DATA_COMPRESSED for compressed extents fs/btrfs/extent_io.c | 11 ++++++++--- fs/ioctl.c | 42 ++++++++++++++++++++++++++++++++++++++---- include/linux/fs.h | 2 ++ include/uapi/linux/fiemap.h | 8 ++++++-- 4 files changed, 54 insertions(+), 9 deletions(-) -- 1.8.3.1 -- To unsubscribe from this list: send the line "unsubscribe linux-fsdevel" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
