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an already sparse file. Drop check for FILE_SUPPORTS_SPARSE_FILES flag. Explicitely set FILE_ATTRIBUTE_SPARSE_FILE attribute in cached attributes. (fhandler_base::lseek): Only set did_lseek if sparseness is supported. * fhandler_disk_file.cc (fhandler_disk_file::ftruncate): Don't attempt to sparsify an already sparse file. Explicitely set FILE_ATTRIBUTE_SPARSE_FILE attribute in cached attributes. * mount.cc (oopt): Add "sparse" flag. (fillout_mntent): Ditto. * path.h (enum path_types): Add PATH_SPARSE. (path_conv::support_sparse): New method. (path_conv::fs_flags): Constify. (path_conv::fs_name_len): Ditto. include/sys/mount.h: Replace unused MOUNT_MIXED flag with MOUNT_SPARSE.
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