Class: File

Inherits:
Object
  • Object
show all
Defined in:
lib/fiemap.rb

Defined Under Namespace

Classes: Extent

Instance Method Summary collapse

Instance Method Details

#extents ⇒ Object 



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# File 'ext/fiemap/fiemap.c', line 148

static VALUE
rb_file_extents(VALUE io)
{
    unsigned int i;
    VALUE temp;
    rb_io_t *fptr;
    __u64 end, start = 0;
    struct stat statinfo;
    VALUE extents = Qnil;
    struct fiemap *p_filemap = (struct fiemap *)xmalloc(offsetof(struct fiemap, fm_extents[0]) + sizeof(struct fiemap_extent) * MAX_EXTENT);

    temp = rb_io_check_io(io);
    GetOpenFile(temp, fptr);

    rb_funcall2(io, id_flush, 0, NULL);

    if (fstat(fptr->fd, &statinfo) < 0) {
	rb_sys_fail_path(fptr->pathv);
    }

    end = statinfo.st_size;
    
    while (start < end) {
        p_filemap->fm_start  = start;
        p_filemap->fm_length = end;
        p_filemap->fm_flags = 0;
        p_filemap->fm_extent_count = MAX_EXTENT;

	if (ioctl(fptr->fd, FS_IOC_FIEMAP, p_filemap) == -1) {
	    rb_sys_fail_path(fptr->pathv);
	}

	if (NIL_P(extents)) {
	    extents = rb_ary_new_capa(p_filemap->fm_mapped_extents);
	}
	else {
	    rb_ary_resize(extents, RARRAY_LEN(extents) + p_filemap->fm_mapped_extents);
	}

        for (i=0; i < p_filemap->fm_mapped_extents; i++) {
            struct fiemap_extent extent;

            extent = p_filemap->fm_extents[i];
	    rb_ary_push(extents, extent_new(cExtent, &extent));
            start = extent.fe_logical + extent.fe_length;
        }
    }

    return extents;
}