LU-9771 flr: instantiate component for truncate

[fs/lustre-release.git] / lustre / lod / lod_object.c

diff --git a/lustre/lod/lod_object.c b/lustre/lod/lod_object.c
index 24516ed..e39d7d6 100644 (file)
--- a/lustre/lod/lod_object.c
+++ b/lustre/lod/lod_object.c
@@ -5248,6 +5248,15 @@ static int lod_declare_update_plain(const struct lu_env *env,
                        GOTO(out, rc);
        }
 
+       if (layout->li_opc == LAYOUT_INTENT_TRUNC) {
+               /**
+                * trunc transfers [size, eof) in the intent extent, while
+                * we'd instantiated components covers [0, size).
+                */
+               layout->li_extent.e_end = layout->li_extent.e_start;
+               layout->li_extent.e_start = 0;
+       }
+
        /* Make sure defined layout covers the requested write range. */
        lod_comp = &lo->ldo_comp_entries[lo->ldo_comp_cnt - 1];
        if (lo->ldo_comp_cnt > 1 &&
@@ -5415,7 +5424,16 @@ static int lod_declare_update_rdonly(const struct lu_env *env,
        lod_stale_components(lo, picked, &extent);
 
        /* instantiate components for the picked mirror, start from 0 */
-       extent = (struct lu_extent) { 0, layout->li_extent.e_end };
+       if (layout->li_opc == LAYOUT_INTENT_TRUNC) {
+               /**
+                * trunc transfers [size, eof) in the intent extent, we'd
+                * stale components overlapping [size, eof), while we'd
+                * instantiated components covers [0, size).
+                */
+               extent.e_end = extent.e_start;
+       }
+       extent.e_start = 0;
+
        lod_foreach_mirror_comp(lod_comp, lo, picked) {
                if (!lu_extent_is_overlapped(&extent,
                                             &lod_comp->llc_extent))
@@ -5522,7 +5540,16 @@ static int lod_declare_update_write_pending(const struct lu_env *env,
 
                /* 2. find out the components need instantiating.
                 * instantiate [0, mlc->mlc_intent->e_end) */
+               if (mlc->mlc_intent->li_opc == LAYOUT_INTENT_TRUNC) {
+                       /**
+                        * trunc transfers [size, eof) in the intent extent,
+                        * we'd stale components overlapping [size, eof),
+                        * while we'd instantiated components covers [0, size).
+                        */
+                       extent.e_end = extent.e_start;
+               }
                extent.e_start = 0;
+
                lod_foreach_mirror_comp(lod_comp, lo, primary) {
                        if (!lu_extent_is_overlapped(&extent,
                                                     &lod_comp->llc_extent))