LU-11376 lov: new foreign LOV format

[fs/lustre-release.git] / lustre / lov / lov_internal.h

diff --git a/lustre/lov/lov_internal.h b/lustre/lov/lov_internal.h
index 05bfc12..33aa806 100644 (file)
--- a/lustre/lov/lov_internal.h
+++ b/lustre/lov/lov_internal.h
@@ -75,9 +75,14 @@ struct lov_stripe_md {
        spinlock_t      lsm_lock;
        pid_t           lsm_lock_owner; /* debugging */
 
-       /* maximum possible file size, might change as OSTs status changes,
-        * e.g. disconnected, deactivated */
-       loff_t          lsm_maxbytes;
+       union {
+               /* maximum possible file size, might change as OSTs status
+                * changes, e.g. disconnected, deactivated
+                */
+               loff_t          lsm_maxbytes;
+               /* size of full foreign LOV */
+               size_t          lsm_foreign_size;
+       };
        struct ost_id   lsm_oi;
        u32             lsm_magic;
        u32             lsm_layout_gen;
@@ -88,6 +93,8 @@ struct lov_stripe_md {
        struct lov_stripe_md_entry *lsm_entries[];
 };
 
+#define lsm_foreign(lsm) (lsm->lsm_entries[0])
+
 static inline bool lsme_inited(const struct lov_stripe_md_entry *lsme)
 {
        return lsme->lsme_flags & LCME_FL_INIT;
@@ -113,6 +120,9 @@ static inline size_t lov_comp_md_size(const struct lov_stripe_md *lsm)
                return lov_mds_md_size(lsm->lsm_entries[0]->lsme_stripe_count,
                                       lsm->lsm_entries[0]->lsme_magic);
 
+       if (lsm->lsm_magic == LOV_MAGIC_FOREIGN)
+               return lsm->lsm_foreign_size;
+
        LASSERT(lsm->lsm_magic == LOV_MAGIC_COMP_V1);
 
        size = sizeof(struct lov_comp_md_v1);
@@ -164,6 +174,7 @@ struct lsm_operations {
 extern const struct lsm_operations lsm_v1_ops;
 extern const struct lsm_operations lsm_v3_ops;
 extern const struct lsm_operations lsm_comp_md_v1_ops;
+extern const struct lsm_operations lsm_foreign_ops;
 static inline const struct lsm_operations *lsm_op_find(int magic)
 {
        switch (magic) {
@@ -173,6 +184,8 @@ static inline const struct lsm_operations *lsm_op_find(int magic)
                return &lsm_v3_ops;
        case LOV_MAGIC_COMP_V1:
                return &lsm_comp_md_v1_ops;
+       case LOV_MAGIC_FOREIGN:
+               return &lsm_foreign_ops;
        default:
                CERROR("unrecognized lsm_magic %08x\n", magic);
                return NULL;