libceph: variable-sized ceph_object_id

[mirror_ubuntu-bionic-kernel.git] / net / ceph / osdmap.c

diff --git a/net/ceph/osdmap.c b/net/ceph/osdmap.c
index 243574c8cf33807fcaf9374530358f1e44080764..4668b871ca47d857ce2263e76f6862826bfbc424 100644 (file)
--- a/net/ceph/osdmap.c
+++ b/net/ceph/osdmap.c
@@ -1381,8 +1381,99 @@ bad:
        return ERR_PTR(err);
 }
 
+void ceph_oid_copy(struct ceph_object_id *dest,
+                  const struct ceph_object_id *src)
+{
+       WARN_ON(!ceph_oid_empty(dest));
+
+       if (src->name != src->inline_name) {
+               /* very rare, see ceph_object_id definition */
+               dest->name = kmalloc(src->name_len + 1,
+                                    GFP_NOIO | __GFP_NOFAIL);
+       }
 
+       memcpy(dest->name, src->name, src->name_len + 1);
+       dest->name_len = src->name_len;
+}
+EXPORT_SYMBOL(ceph_oid_copy);
 
+static __printf(2, 0)
+int oid_printf_vargs(struct ceph_object_id *oid, const char *fmt, va_list ap)
+{
+       int len;
+
+       WARN_ON(!ceph_oid_empty(oid));
+
+       len = vsnprintf(oid->inline_name, sizeof(oid->inline_name), fmt, ap);
+       if (len >= sizeof(oid->inline_name))
+               return len;
+
+       oid->name_len = len;
+       return 0;
+}
+
+/*
+ * If oid doesn't fit into inline buffer, BUG.
+ */
+void ceph_oid_printf(struct ceph_object_id *oid, const char *fmt, ...)
+{
+       va_list ap;
+
+       va_start(ap, fmt);
+       BUG_ON(oid_printf_vargs(oid, fmt, ap));
+       va_end(ap);
+}
+EXPORT_SYMBOL(ceph_oid_printf);
+
+static __printf(3, 0)
+int oid_aprintf_vargs(struct ceph_object_id *oid, gfp_t gfp,
+                     const char *fmt, va_list ap)
+{
+       va_list aq;
+       int len;
+
+       va_copy(aq, ap);
+       len = oid_printf_vargs(oid, fmt, aq);
+       va_end(aq);
+
+       if (len) {
+               char *external_name;
+
+               external_name = kmalloc(len + 1, gfp);
+               if (!external_name)
+                       return -ENOMEM;
+
+               oid->name = external_name;
+               WARN_ON(vsnprintf(oid->name, len + 1, fmt, ap) != len);
+               oid->name_len = len;
+       }
+
+       return 0;
+}
+
+/*
+ * If oid doesn't fit into inline buffer, allocate.
+ */
+int ceph_oid_aprintf(struct ceph_object_id *oid, gfp_t gfp,
+                    const char *fmt, ...)
+{
+       va_list ap;
+       int ret;
+
+       va_start(ap, fmt);
+       ret = oid_aprintf_vargs(oid, gfp, fmt, ap);
+       va_end(ap);
+
+       return ret;
+}
+EXPORT_SYMBOL(ceph_oid_aprintf);
+
+void ceph_oid_destroy(struct ceph_object_id *oid)
+{
+       if (oid->name != oid->inline_name)
+               kfree(oid->name);
+}
+EXPORT_SYMBOL(ceph_oid_destroy);
 
 /*
  * calculate file layout from given offset, length.
@@ -1474,7 +1565,7 @@ int ceph_oloc_oid_to_pg(struct ceph_osdmap *osdmap,
        pg_out->seed = ceph_str_hash(pi->object_hash, oid->name,
                                     oid->name_len);
 
-       dout("%s '%.*s' pgid %llu.%x\n", __func__, oid->name_len, oid->name,
+       dout("%s %*pE pgid %llu.%x\n", __func__, oid->name_len, oid->name,
             pg_out->pool, pg_out->seed);
        return 0;
 }