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authorIlya Dryomov <idryomov@gmail.com>2016-04-29 20:54:20 +0300
committerIlya Dryomov <idryomov@gmail.com>2016-05-26 01:36:22 +0300
commitd30291b985d1854565d7f2c82a4457869d5265e8 (patch)
tree43b99c978c5e4ea321d72590dfeebd42c10de28e /include/linux/ceph/osdmap.h
parent711da55d36a6f1eddcd340969be7223110d2f6b0 (diff)
downloadlinux-d30291b985d1854565d7f2c82a4457869d5265e8.tar.xz
libceph: variable-sized ceph_object_id
Currently ceph_object_id can hold object names of up to 100 (CEPH_MAX_OID_NAME_LEN) characters. This is enough for all use cases, expect one - long rbd image names: - a format 1 header is named "<imgname>.rbd" - an object that points to a format 2 header is named "rbd_id.<imgname>" We operate on these potentially long-named objects during rbd map, and, for format 1 images, during header refresh. (A format 2 header name is a small system-generated string.) Lift this 100 character limit by making ceph_object_id be able to point to an externally-allocated string. Apart from being able to work with almost arbitrarily-long named objects, this allows us to reduce the size of ceph_object_id from >100 bytes to 64 bytes. Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
Diffstat (limited to 'include/linux/ceph/osdmap.h')
-rw-r--r--include/linux/ceph/osdmap.h62
1 files changed, 37 insertions, 25 deletions
diff --git a/include/linux/ceph/osdmap.h b/include/linux/ceph/osdmap.h
index e55c08bc3a96..777a29412706 100644
--- a/include/linux/ceph/osdmap.h
+++ b/include/linux/ceph/osdmap.h
@@ -64,11 +64,47 @@ struct ceph_object_locator {
*/
#define CEPH_MAX_OID_NAME_LEN 100
+/*
+ * 51-char inline_name is long enough for all cephfs and all but one
+ * rbd requests: <imgname> in "<imgname>.rbd"/"rbd_id.<imgname>" can be
+ * arbitrarily long (~PAGE_SIZE). It's done once during rbd map; all
+ * other rbd requests fit into inline_name.
+ *
+ * Makes ceph_object_id 64 bytes on 64-bit.
+ */
+#define CEPH_OID_INLINE_LEN 52
+
+/*
+ * Both inline and external buffers have space for a NUL-terminator,
+ * which is carried around. It's not required though - RADOS object
+ * names don't have to be NUL-terminated and may contain NULs.
+ */
struct ceph_object_id {
- char name[CEPH_MAX_OID_NAME_LEN];
+ char *name;
+ char inline_name[CEPH_OID_INLINE_LEN];
int name_len;
};
+static inline void ceph_oid_init(struct ceph_object_id *oid)
+{
+ oid->name = oid->inline_name;
+ oid->name_len = 0;
+}
+
+static inline bool ceph_oid_empty(const struct ceph_object_id *oid)
+{
+ return oid->name == oid->inline_name && !oid->name_len;
+}
+
+void ceph_oid_copy(struct ceph_object_id *dest,
+ const struct ceph_object_id *src);
+__printf(2, 3)
+void ceph_oid_printf(struct ceph_object_id *oid, const char *fmt, ...);
+__printf(3, 4)
+int ceph_oid_aprintf(struct ceph_object_id *oid, gfp_t gfp,
+ const char *fmt, ...);
+void ceph_oid_destroy(struct ceph_object_id *oid);
+
struct ceph_pg_mapping {
struct rb_node node;
struct ceph_pg pgid;
@@ -113,30 +149,6 @@ struct ceph_osdmap {
int crush_scratch_ary[CEPH_PG_MAX_SIZE * 3];
};
-static inline void ceph_oid_set_name(struct ceph_object_id *oid,
- const char *name)
-{
- int len;
-
- len = strlen(name);
- if (len > sizeof(oid->name)) {
- WARN(1, "ceph_oid_set_name '%s' len %d vs %zu, truncating\n",
- name, len, sizeof(oid->name));
- len = sizeof(oid->name);
- }
-
- memcpy(oid->name, name, len);
- oid->name_len = len;
-}
-
-static inline void ceph_oid_copy(struct ceph_object_id *dest,
- struct ceph_object_id *src)
-{
- BUG_ON(src->name_len > sizeof(dest->name));
- memcpy(dest->name, src->name, src->name_len);
- dest->name_len = src->name_len;
-}
-
static inline int ceph_osd_exists(struct ceph_osdmap *map, int osd)
{
return osd >= 0 && osd < map->max_osd &&