@@ -152,12 +152,7 @@ xfs_exchmaps_check_forks(
ifp2->if_format == XFS_DINODE_FMT_LOCAL)
return -EINVAL;
- /* We don't support realtime data forks yet. */
- if (!XFS_IS_REALTIME_INODE(req->ip1))
- return 0;
- if (whichfork == XFS_ATTR_FORK)
- return 0;
- return -EINVAL;
+ return 0;
}
#ifdef CONFIG_XFS_QUOTA
@@ -198,6 +193,8 @@ xfs_exchmaps_can_skip_mapping(
struct xfs_exchmaps_intent *xmi,
struct xfs_bmbt_irec *irec)
{
+ struct xfs_mount *mp = xmi->xmi_ip1->i_mount;
+
/* Do not skip this mapping if the caller did not tell us to. */
if (!(xmi->xmi_flags & XFS_EXCHMAPS_INO1_WRITTEN))
return false;
@@ -209,11 +206,64 @@ xfs_exchmaps_can_skip_mapping(
/*
* The mapping is unwritten or a hole. It cannot be a delalloc
* reservation because we already excluded those. It cannot be an
- * unwritten mapping with dirty page cache because we flushed the page
- * cache. We don't support realtime files yet, so we needn't (yet)
- * deal with them.
+ * unwritten extent with dirty page cache because we flushed the page
+ * cache. For files where the allocation unit is 1FSB (files on the
+ * data dev, rt files if the extent size is 1FSB), we can safely
+ * skip this mapping.
*/
- return true;
+ if (!xfs_inode_has_bigallocunit(xmi->xmi_ip1))
+ return true;
+
+ /*
+ * For a realtime file with a multi-fsb allocation unit, the decision
+ * is trickier because we can only swap full allocation units.
+ * Unwritten mappings can appear in the middle of an rtx if the rtx is
+ * partially written, but they can also appear for preallocations.
+ *
+ * If the mapping is a hole, skip it entirely. Holes should align with
+ * rtx boundaries.
+ */
+ if (!xfs_bmap_is_real_extent(irec))
+ return true;
+
+ /*
+ * All mappings below this point are unwritten.
+ *
+ * - If the beginning is not aligned to an rtx, trim the end of the
+ * mapping so that it does not cross an rtx boundary, and swap it.
+ *
+ * - If both ends are aligned to an rtx, skip the entire mapping.
+ */
+ if (!isaligned_64(irec->br_startoff, mp->m_sb.sb_rextsize)) {
+ xfs_fileoff_t new_end;
+
+ new_end = roundup_64(irec->br_startoff, mp->m_sb.sb_rextsize);
+ irec->br_blockcount = min(irec->br_blockcount,
+ new_end - irec->br_startoff);
+ return false;
+ }
+ if (isaligned_64(irec->br_blockcount, mp->m_sb.sb_rextsize))
+ return true;
+
+ /*
+ * All mappings below this point are unwritten, start on an rtx
+ * boundary, and do not end on an rtx boundary.
+ *
+ * - If the mapping is longer than one rtx, trim the end of the mapping
+ * down to an rtx boundary and skip it.
+ *
+ * - The mapping is shorter than one rtx. Swap it.
+ */
+ if (irec->br_blockcount > mp->m_sb.sb_rextsize) {
+ xfs_fileoff_t new_end;
+
+ new_end = rounddown_64(irec->br_startoff + irec->br_blockcount,
+ mp->m_sb.sb_rextsize);
+ irec->br_blockcount = new_end - irec->br_startoff;
+ return true;
+ }
+
+ return false;
}
/*
@@ -21,6 +21,7 @@
#include "xfs_sb.h"
#include "xfs_icache.h"
#include "xfs_log.h"
+#include "xfs_rtbitmap.h"
#include <linux/fsnotify.h>
/*
@@ -241,6 +242,14 @@ xfs_exchrange_mappings(
if (fxr->flags & XFS_EXCHANGE_RANGE_FILE1_WRITTEN)
req.flags |= XFS_EXCHMAPS_INO1_WRITTEN;
+ /*
+ * Round the request length up to the nearest file allocation unit.
+ * The prep function already checked that the request offsets and
+ * length in @fxr are safe to round up.
+ */
+ if (xfs_inode_has_bigallocunit(ip2))
+ req.blockcount = xfs_rtb_roundup_rtx(mp, req.blockcount);
+
error = xfs_exchrange_estimate(&req);
if (error)
return error;