fs/xfs/xfs_reflink.c

282 	struct xfs_bmbt_irec	*imap,
287 	    !isnullstartblock(imap->br_startblock)) {
293 	return xfs_reflink_trim_around_shared(ip, imap, shared);
363 	struct xfs_bmbt_irec	*imap,
368 	xfs_fileoff_t		offset_fsb = imap->br_startoff;
369 	xfs_filblks_t		count_fsb = imap->br_blockcount;
381 		xfs_trim_extent(imap, imap->br_startoff,
382 				cmap->br_startoff - imap->br_startoff);
383 		return xfs_bmap_trim_cow(ip, imap, shared);
388 		xfs_trim_extent(imap, cmap->br_startoff, cmap->br_blockcount);
401 	struct xfs_bmbt_irec	*imap,
405 	xfs_fileoff_t		offset_fsb = imap->br_startoff;
406 	xfs_filblks_t		count_fsb = imap->br_blockcount;
410 	 * cmap might larger than imap due to cowextsize hint.
434 	struct xfs_bmbt_irec	*imap,
448 	resaligned = xfs_aligned_fsb_count(imap->br_startoff,
449 		imap->br_blockcount, xfs_get_cowextsz_hint(ip));
468 	error = xfs_find_trim_cow_extent(ip, imap, cmap, shared, &found);
479 	error = xfs_bmapi_write(tp, ip, imap->br_startoff, imap->br_blockcount,
491 	return xfs_reflink_convert_unwritten(ip, imap, cmap, convert_now);
501 	struct xfs_bmbt_irec	*imap,
524 		error = xfs_find_trim_cow_extent(ip, imap, cmap, shared,
552 	} while (cmap->br_startoff + cmap->br_blockcount <= imap->br_startoff);
554 	return xfs_reflink_convert_unwritten(ip, imap, cmap, convert_now);
565 	struct xfs_bmbt_irec	*imap,
580 	error = xfs_find_trim_cow_extent(ip, imap, cmap, shared, &found);
586 		return xfs_reflink_convert_unwritten(ip, imap, cmap,
593 	if (cmap->br_startoff > imap->br_startoff)
594 		return xfs_reflink_fill_cow_hole(ip, imap, cmap, shared,
603 		return xfs_reflink_fill_delalloc(ip, imap, cmap, shared,
1106  *    - Read src's bmbt at the start of srange ("imap")
1107  *    - If imap doesn't exist, make imap appear to start at the end of srange
1109  *    - If imap starts before srange, advance imap to start at srange.
1110  *    - If imap goes beyond srange, truncate imap to end at the end of srange.
1111  *    - Punch (imap start - srange start + imap len) blocks from dest at
1113  *    - If imap points to a real range of pblks,
1114  *         > Increase the refcount of the imap's pblks
1115  *         > Map imap's pblks into dest at the offset
1116  *           (drange start + imap start - srange start)
1117  *    - Advance drange and srange by (imap start - srange start + imap len)
1535 	struct xfs_bmbt_irec	imap;
1556 		error = xfs_bmapi_read(src, srcoff, len, &imap, &nimaps, 0);
1567 		ASSERT(nimaps == 1 && imap.br_startoff == srcoff);
1568 		if (imap.br_startblock == DELAYSTARTBLOCK) {
1569 			ASSERT(imap.br_startblock != DELAYSTARTBLOCK);
1575 		trace_xfs_reflink_remap_extent_src(src, &imap);
1578 		imap.br_startoff = destoff;
1579 		error = xfs_reflink_remap_extent(dest, &imap, new_isize);
1589 		srcoff += imap.br_blockcount;
1590 		destoff += imap.br_blockcount;
1591 		len -= imap.br_blockcount;
1592 		remapped_len += imap.br_blockcount;