LU-11421 dom: manual OST-to-DOM migration via mirroring

[fs/lustre-release.git] / lustre / utils / liblustreapi_layout.c

diff --git a/lustre/utils/liblustreapi_layout.c b/lustre/utils/liblustreapi_layout.c
index fefb4f2..d88deb3 100644 (file)
--- a/lustre/utils/liblustreapi_layout.c
+++ b/lustre/utils/liblustreapi_layout.c
@@ -2987,7 +2987,7 @@ enum llapi_layout_comp_sanity_error {
        LSE_FLAGS,
        LSE_DOM_EXTENSION,
        LSE_DOM_EXTENSION_FOLLOWING,
-       LSE_DOM_FLR,
+       LSE_DOM_FIRST,
        LSE_SET_COMP_START,
        LSE_NOT_ZERO_LENGTH_EXTENDABLE,
        LSE_END_NOT_GREATER,
@@ -3014,8 +3014,8 @@ const char *llapi_layout_strerror[] =
                "DoM components can't be extension space",
        [LSE_DOM_EXTENSION_FOLLOWING] =
                "DoM components cannot be followed by extension space",
-       [LSE_DOM_FLR] =
-               "FLR and DoM are not supported together",
+       [LSE_DOM_FIRST] =
+               "DoM component should be the first one in a file/mirror",
        [LSE_SET_COMP_START] =
                "Must set previous component extent before adding next",
        [LSE_NOT_ZERO_LENGTH_EXTENDABLE] =
@@ -3127,10 +3127,10 @@ static int llapi_layout_sanity_cb(struct llapi_layout *layout,
                        goto out_err;
                }
 
-               /* DoM and FLR are not supported together */
-               if (args->lsa_flr && first_comp) {
-                       args->lsa_rc = LSE_DOM_FLR;
-                       errno = ENOTSUP;
+               /* DoM should be the first component in a mirror */
+               if (!first_comp) {
+                       args->lsa_rc = LSE_DOM_FIRST;
+                       errno = EINVAL;
                        goto out_err;
                }
        }
@@ -3281,3 +3281,35 @@ int llapi_layout_sanity(struct llapi_layout *layout, bool incomplete, bool flr)
 
        return rc;
 }
+
+int llapi_layout_dom_size(struct llapi_layout *layout, uint64_t *size)
+{
+       uint64_t pattern, start;
+       int rc;
+
+       if (!layout || !llapi_layout_is_composite(layout)) {
+               *size = 0;
+               return 0;
+       }
+
+       rc = llapi_layout_comp_use(layout, LLAPI_LAYOUT_COMP_USE_FIRST);
+       if (rc)
+               return -errno;
+
+       rc = llapi_layout_pattern_get(layout, &pattern);
+       if (rc)
+               return -errno;
+
+       if (pattern != LOV_PATTERN_MDT && pattern != LLAPI_LAYOUT_MDT) {
+               *size = 0;
+               return 0;
+       }
+
+       rc = llapi_layout_comp_extent_get(layout, &start, size);
+       if (rc)
+               return -errno;
+       if (start)
+               return -ERANGE;
+       return 0;
+}
+