Merge branch 'linus' into perf/core

Refresh the branch to a v3.14-rc base before queueing up new devel patches.

Signed-off-by: Ingo Molnar <mingo@kernel.org>

9 files changed, 177 insertions, 103 deletions

diff --git a/include/linux/ceph/buffer.h b/include/linux/ceph/buffer.h
index 58d19014068f..07ad423cc37f 100644
--- a/include/linux/ceph/buffer.h
+++ b/include/linux/ceph/buffer.h
@@ -17,7 +17,6 @@ struct ceph_buffer {
         struct kref kref;
         struct kvec vec;
         size_t alloc_len;
-        bool is_vmalloc;
 };
 
 extern struct ceph_buffer *ceph_buffer_new(size_t len, gfp_t gfp);
diff --git a/include/linux/ceph/ceph_features.h b/include/linux/ceph/ceph_features.h
index 4c42080347af..138448f766b4 100644
--- a/include/linux/ceph/ceph_features.h
+++ b/include/linux/ceph/ceph_features.h
@@ -4,42 +4,73 @@
 /*
  * feature bits
  */
-#define CEPH_FEATURE_UID            (1<<0)
-#define CEPH_FEATURE_NOSRCADDR      (1<<1)
-#define CEPH_FEATURE_MONCLOCKCHECK  (1<<2)
-#define CEPH_FEATURE_FLOCK          (1<<3)
-#define CEPH_FEATURE_SUBSCRIBE2     (1<<4)
-#define CEPH_FEATURE_MONNAMES       (1<<5)
-#define CEPH_FEATURE_RECONNECT_SEQ  (1<<6)
-#define CEPH_FEATURE_DIRLAYOUTHASH  (1<<7)
-#define CEPH_FEATURE_OBJECTLOCATOR  (1<<8)
-#define CEPH_FEATURE_PGID64         (1<<9)
-#define CEPH_FEATURE_INCSUBOSDMAP   (1<<10)
-#define CEPH_FEATURE_PGPOOL3        (1<<11)
-#define CEPH_FEATURE_OSDREPLYMUX    (1<<12)
-#define CEPH_FEATURE_OSDENC         (1<<13)
-#define CEPH_FEATURE_OMAP           (1<<14)
-#define CEPH_FEATURE_MONENC         (1<<15)
-#define CEPH_FEATURE_QUERY_T        (1<<16)
-#define CEPH_FEATURE_INDEP_PG_MAP   (1<<17)
-#define CEPH_FEATURE_CRUSH_TUNABLES (1<<18)
-#define CEPH_FEATURE_CHUNKY_SCRUB   (1<<19)
-#define CEPH_FEATURE_MON_NULLROUTE  (1<<20)
-#define CEPH_FEATURE_MON_GV         (1<<21)
-#define CEPH_FEATURE_BACKFILL_RESERVATION (1<<22)
-#define CEPH_FEATURE_MSG_AUTH       (1<<23)
-#define CEPH_FEATURE_RECOVERY_RESERVATION (1<<24)
-#define CEPH_FEATURE_CRUSH_TUNABLES2 (1<<25)
-#define CEPH_FEATURE_CREATEPOOLID   (1<<26)
-#define CEPH_FEATURE_REPLY_CREATE_INODE   (1<<27)
-#define CEPH_FEATURE_OSD_HBMSGS     (1<<28)
-#define CEPH_FEATURE_MDSENC         (1<<29)
-#define CEPH_FEATURE_OSDHASHPSPOOL  (1<<30)
+#define CEPH_FEATURE_UID            (1ULL<<0)
+#define CEPH_FEATURE_NOSRCADDR      (1ULL<<1)
+#define CEPH_FEATURE_MONCLOCKCHECK  (1ULL<<2)
+#define CEPH_FEATURE_FLOCK          (1ULL<<3)
+#define CEPH_FEATURE_SUBSCRIBE2     (1ULL<<4)
+#define CEPH_FEATURE_MONNAMES       (1ULL<<5)
+#define CEPH_FEATURE_RECONNECT_SEQ  (1ULL<<6)
+#define CEPH_FEATURE_DIRLAYOUTHASH  (1ULL<<7)
+#define CEPH_FEATURE_OBJECTLOCATOR  (1ULL<<8)
+#define CEPH_FEATURE_PGID64         (1ULL<<9)
+#define CEPH_FEATURE_INCSUBOSDMAP   (1ULL<<10)
+#define CEPH_FEATURE_PGPOOL3        (1ULL<<11)
+#define CEPH_FEATURE_OSDREPLYMUX    (1ULL<<12)
+#define CEPH_FEATURE_OSDENC         (1ULL<<13)
+#define CEPH_FEATURE_OMAP           (1ULL<<14)
+#define CEPH_FEATURE_MONENC         (1ULL<<15)
+#define CEPH_FEATURE_QUERY_T        (1ULL<<16)
+#define CEPH_FEATURE_INDEP_PG_MAP   (1ULL<<17)
+#define CEPH_FEATURE_CRUSH_TUNABLES (1ULL<<18)
+#define CEPH_FEATURE_CHUNKY_SCRUB   (1ULL<<19)
+#define CEPH_FEATURE_MON_NULLROUTE  (1ULL<<20)
+#define CEPH_FEATURE_MON_GV         (1ULL<<21)
+#define CEPH_FEATURE_BACKFILL_RESERVATION (1ULL<<22)
+#define CEPH_FEATURE_MSG_AUTH       (1ULL<<23)
+#define CEPH_FEATURE_RECOVERY_RESERVATION (1ULL<<24)
+#define CEPH_FEATURE_CRUSH_TUNABLES2 (1ULL<<25)
+#define CEPH_FEATURE_CREATEPOOLID   (1ULL<<26)
+#define CEPH_FEATURE_REPLY_CREATE_INODE   (1ULL<<27)
+#define CEPH_FEATURE_OSD_HBMSGS     (1ULL<<28)
+#define CEPH_FEATURE_MDSENC         (1ULL<<29)
+#define CEPH_FEATURE_OSDHASHPSPOOL  (1ULL<<30)
+#define CEPH_FEATURE_MON_SINGLE_PAXOS (1ULL<<31)
+#define CEPH_FEATURE_OSD_SNAPMAPPER (1ULL<<32)
+#define CEPH_FEATURE_MON_SCRUB      (1ULL<<33)
+#define CEPH_FEATURE_OSD_PACKED_RECOVERY (1ULL<<34)
+#define CEPH_FEATURE_OSD_CACHEPOOL (1ULL<<35)
+#define CEPH_FEATURE_CRUSH_V2      (1ULL<<36)  /* new indep; SET_* steps */
+#define CEPH_FEATURE_EXPORT_PEER   (1ULL<<37)
+#define CEPH_FEATURE_OSD_ERASURE_CODES (1ULL<<38)
+
+/*
+ * The introduction of CEPH_FEATURE_OSD_SNAPMAPPER caused the feature
+ * vector to evaluate to 64 bit ~0.  To cope, we designate 1ULL << 63
+ * to mean 33 bit ~0, and introduce a helper below to do the
+ * translation.
+ *
+ * This was introduced by ceph.git commit
+ *   9ea02b84104045c2ffd7e7f4e7af512953855ecd v0.58-657-g9ea02b8
+ * and fixed by ceph.git commit
+ *   4255b5c2fb54ae40c53284b3ab700fdfc7e61748 v0.65-263-g4255b5c
+ */
+#define CEPH_FEATURE_RESERVED (1ULL<<63)
+
+static inline u64 ceph_sanitize_features(u64 features)
+{
+        if (features & CEPH_FEATURE_RESERVED) {
+                /* everything through OSD_SNAPMAPPER */
+                return 0x1ffffffffull;
+        } else {
+                return features;
+        }
+}
 
 /*
  * Features supported.
  */
-#define CEPH_FEATURES_SUPPORTED_DEFAULT  \
+#define CEPH_FEATURES_SUPPORTED_DEFAULT         \
         (CEPH_FEATURE_NOSRCADDR |               \
          CEPH_FEATURE_RECONNECT_SEQ |           \
          CEPH_FEATURE_PGID64 |                  \
@@ -48,7 +79,10 @@
          CEPH_FEATURE_CRUSH_TUNABLES |          \
          CEPH_FEATURE_CRUSH_TUNABLES2 |         \
          CEPH_FEATURE_REPLY_CREATE_INODE |      \
-         CEPH_FEATURE_OSDHASHPSPOOL)
+         CEPH_FEATURE_OSDHASHPSPOOL |           \
+         CEPH_FEATURE_OSD_CACHEPOOL |           \
+         CEPH_FEATURE_CRUSH_V2 |                \
+         CEPH_FEATURE_EXPORT_PEER)
 
 #define CEPH_FEATURES_REQUIRED_DEFAULT   \
         (CEPH_FEATURE_NOSRCADDR |        \
@@ -56,4 +90,5 @@
          CEPH_FEATURE_PGID64 |           \
          CEPH_FEATURE_PGPOOL3 |          \
          CEPH_FEATURE_OSDENC)
+
 #endif
diff --git a/include/linux/ceph/ceph_fs.h b/include/linux/ceph/ceph_fs.h
index 2ad7b860f062..2623cffc73a1 100644
--- a/include/linux/ceph/ceph_fs.h
+++ b/include/linux/ceph/ceph_fs.h
@@ -53,6 +53,29 @@ struct ceph_file_layout {
         __le32 fl_pg_pool;      /* namespace, crush ruleset, rep level */
 } __attribute__ ((packed));
 
+#define ceph_file_layout_su(l) ((__s32)le32_to_cpu((l).fl_stripe_unit))
+#define ceph_file_layout_stripe_count(l) \
+        ((__s32)le32_to_cpu((l).fl_stripe_count))
+#define ceph_file_layout_object_size(l) ((__s32)le32_to_cpu((l).fl_object_size))
+#define ceph_file_layout_cas_hash(l) ((__s32)le32_to_cpu((l).fl_cas_hash))
+#define ceph_file_layout_object_su(l) \
+        ((__s32)le32_to_cpu((l).fl_object_stripe_unit))
+#define ceph_file_layout_pg_pool(l) \
+        ((__s32)le32_to_cpu((l).fl_pg_pool))
+
+static inline unsigned ceph_file_layout_stripe_width(struct ceph_file_layout *l)
+{
+        return le32_to_cpu(l->fl_stripe_unit) *
+                le32_to_cpu(l->fl_stripe_count);
+}
+
+/* "period" == bytes before i start on a new set of objects */
+static inline unsigned ceph_file_layout_period(struct ceph_file_layout *l)
+{
+        return le32_to_cpu(l->fl_object_size) *
+                le32_to_cpu(l->fl_stripe_count);
+}
+
 #define CEPH_MIN_STRIPE_UNIT 65536
 
 int ceph_file_layout_is_valid(const struct ceph_file_layout *layout);
@@ -282,6 +305,8 @@ enum {
         CEPH_SESSION_RENEWCAPS,
         CEPH_SESSION_STALE,
         CEPH_SESSION_RECALL_STATE,
+        CEPH_SESSION_FLUSHMSG,
+        CEPH_SESSION_FLUSHMSG_ACK,
 };
 
 extern const char *ceph_session_op_name(int op);
@@ -457,7 +482,8 @@ struct ceph_mds_reply_cap {
         __u8 flags;                    /* CEPH_CAP_FLAG_* */
 } __attribute__ ((packed));
 
-#define CEPH_CAP_FLAG_AUTH  1          /* cap is issued by auth mds */
+#define CEPH_CAP_FLAG_AUTH      (1 << 0)  /* cap is issued by auth mds */
+#define CEPH_CAP_FLAG_RELEASE   (1 << 1)  /* release the cap */
 
 /* inode record, for bundling with mds reply */
 struct ceph_mds_reply_inode {
@@ -658,6 +684,14 @@ struct ceph_mds_caps {
         __le32 time_warp_seq;
 } __attribute__ ((packed));
 
+struct ceph_mds_cap_peer {
+        __le64 cap_id;
+        __le32 seq;
+        __le32 mseq;
+        __le32 mds;
+        __u8   flags;
+} __attribute__ ((packed));
+
 /* cap release msg head */
 struct ceph_mds_cap_release {
         __le32 num;                /* number of cap_items that follow */
diff --git a/include/linux/ceph/decode.h b/include/linux/ceph/decode.h
index 0442c3d800f0..a6ef9cc267ec 100644
--- a/include/linux/ceph/decode.h
+++ b/include/linux/ceph/decode.h
@@ -8,23 +8,6 @@
 
 #include <linux/ceph/types.h>
 
-/* This seemed to be the easiest place to define these */
-
-#define U8_MAX  ((u8)(~0U))
-#define U16_MAX ((u16)(~0U))
-#define U32_MAX ((u32)(~0U))
-#define U64_MAX ((u64)(~0ULL))
-
-#define S8_MAX  ((s8)(U8_MAX >> 1))
-#define S16_MAX ((s16)(U16_MAX >> 1))
-#define S32_MAX ((s32)(U32_MAX >> 1))
-#define S64_MAX ((s64)(U64_MAX >> 1LL))
-
-#define S8_MIN  ((s8)(-S8_MAX - 1))
-#define S16_MIN ((s16)(-S16_MAX - 1))
-#define S32_MIN ((s32)(-S32_MAX - 1))
-#define S64_MIN ((s64)(-S64_MAX - 1LL))
-
 /*
  * in all cases,
  *   void **p     pointer to position pointer
diff --git a/include/linux/ceph/libceph.h b/include/linux/ceph/libceph.h
index 2e3024881a5e..2f49aa4c4f7f 100644
--- a/include/linux/ceph/libceph.h
+++ b/include/linux/ceph/libceph.h
@@ -122,8 +122,8 @@ struct ceph_client {
 
         int (*extra_mon_dispatch)(struct ceph_client *, struct ceph_msg *);
 
-        u32 supported_features;
-        u32 required_features;
+        u64 supported_features;
+        u64 required_features;
 
         struct ceph_messenger msgr;   /* messenger instance */
         struct ceph_mon_client monc;
@@ -173,15 +173,18 @@ static inline int calc_pages_for(u64 off, u64 len)
                 (off >> PAGE_CACHE_SHIFT);
 }
 
+extern struct kmem_cache *ceph_inode_cachep;
+extern struct kmem_cache *ceph_cap_cachep;
+extern struct kmem_cache *ceph_dentry_cachep;
+extern struct kmem_cache *ceph_file_cachep;
+
 /* ceph_common.c */
 extern bool libceph_compatible(void *data);
 
 extern const char *ceph_msg_type_name(int type);
 extern int ceph_check_fsid(struct ceph_client *client, struct ceph_fsid *fsid);
-extern struct kmem_cache *ceph_inode_cachep;
-extern struct kmem_cache *ceph_cap_cachep;
-extern struct kmem_cache *ceph_dentry_cachep;
-extern struct kmem_cache *ceph_file_cachep;
+extern void *ceph_kvmalloc(size_t size, gfp_t flags);
+extern void ceph_kvfree(const void *ptr);
 
 extern struct ceph_options *ceph_parse_options(char *options,
                               const char *dev_name, const char *dev_name_end,
@@ -192,8 +195,8 @@ extern int ceph_compare_options(struct ceph_options *new_opt,
                                 struct ceph_client *client);
 extern struct ceph_client *ceph_create_client(struct ceph_options *opt,
                                               void *private,
-                                              unsigned supported_features,
-                                              unsigned required_features);
+                                              u64 supported_features,
+                                              u64 required_features);
 extern u64 ceph_client_id(struct ceph_client *client);
 extern void ceph_destroy_client(struct ceph_client *client);
 extern int __ceph_open_session(struct ceph_client *client,
diff --git a/include/linux/ceph/messenger.h b/include/linux/ceph/messenger.h
index 7c1420bb1dce..d21f2dba0731 100644
--- a/include/linux/ceph/messenger.h
+++ b/include/linux/ceph/messenger.h
@@ -1,6 +1,7 @@
 #ifndef __FS_CEPH_MESSENGER_H
 #define __FS_CEPH_MESSENGER_H
 
+#include <linux/blk_types.h>
 #include <linux/kref.h>
 #include <linux/mutex.h>
 #include <linux/net.h>
@@ -60,8 +61,8 @@ struct ceph_messenger {
         u32 global_seq;
         spinlock_t global_seq_lock;
 
-        u32 supported_features;
-        u32 required_features;
+        u64 supported_features;
+        u64 required_features;
 };
 
 enum ceph_msg_data_type {
@@ -119,8 +120,7 @@ struct ceph_msg_data_cursor {
 #ifdef CONFIG_BLOCK
                 struct {                                /* bio */
                         struct bio      *bio;           /* bio from list */
-                        unsigned int    vector_index;   /* vector from bio */
-                        unsigned int    vector_offset;  /* bytes from vector */
+                        struct bvec_iter bvec_iter;
                 };
 #endif /* CONFIG_BLOCK */
                 struct {                                /* pages */
@@ -154,10 +154,9 @@ struct ceph_msg {
         struct list_head list_head;     /* links for connection lists */
 
         struct kref kref;
-        bool front_is_vmalloc;
         bool more_to_follow;
         bool needs_out_seq;
-        int front_max;
+        int front_alloc_len;
         unsigned long ack_stamp;        /* tx: when we were acked */
 
         struct ceph_msgpool *pool;
@@ -192,7 +191,7 @@ struct ceph_connection {
 
         struct ceph_entity_name peer_name; /* peer name */
 
-        unsigned peer_features;
+        u64 peer_features;
         u32 connect_seq;      /* identify the most recent connection
                                  attempt for this connection, client */
         u32 peer_global_seq;  /* peer's global seq for this connection */
@@ -256,8 +255,8 @@ extern void ceph_msgr_flush(void);
 
 extern void ceph_messenger_init(struct ceph_messenger *msgr,
                         struct ceph_entity_addr *myaddr,
-                        u32 supported_features,
-                        u32 required_features,
+                        u64 supported_features,
+                        u64 required_features,
                         bool nocrc);
 
 extern void ceph_con_init(struct ceph_connection *con, void *private,
diff --git a/include/linux/ceph/osd_client.h b/include/linux/ceph/osd_client.h
index 8f47625a0661..fd47e872ebcc 100644
--- a/include/linux/ceph/osd_client.h
+++ b/include/linux/ceph/osd_client.h
@@ -12,12 +12,6 @@
 #include <linux/ceph/auth.h>
 #include <linux/ceph/pagelist.h>
 
-/* 
- * Maximum object name size 
- * (must be at least as big as RBD_MAX_MD_NAME_LEN -- currently 100) 
- */
-#define MAX_OBJ_NAME_SIZE 100
-
 struct ceph_msg;
 struct ceph_snap_context;
 struct ceph_osd_request;
@@ -138,6 +132,7 @@ struct ceph_osd_request {
         __le64           *r_request_pool;
         void             *r_request_pgid;
         __le32           *r_request_attempts;
+        bool              r_paused;
         struct ceph_eversion *r_request_reassert_version;
 
         int               r_result;
@@ -158,15 +153,21 @@ struct ceph_osd_request {
         struct inode *r_inode;                /* for use by callbacks */
         void *r_priv;                         /* ditto */
 
-        char              r_oid[MAX_OBJ_NAME_SIZE];          /* object name */
-        int               r_oid_len;
+        struct ceph_object_locator r_base_oloc;
+        struct ceph_object_id r_base_oid;
+        struct ceph_object_locator r_target_oloc;
+        struct ceph_object_id r_target_oid;
+
         u64               r_snapid;
         unsigned long     r_stamp;            /* send OR check time */
 
-        struct ceph_file_layout r_file_layout;
         struct ceph_snap_context *r_snapc;    /* snap context for writes */
 };
 
+struct ceph_request_redirect {
+        struct ceph_object_locator oloc;
+};
+
 struct ceph_osd_event {
         u64 cookie;
         int one_shot;
diff --git a/include/linux/ceph/osdmap.h b/include/linux/ceph/osdmap.h
index d05cc4451af6..49ff69f0746b 100644
--- a/include/linux/ceph/osdmap.h
+++ b/include/linux/ceph/osdmap.h
@@ -35,13 +35,26 @@ struct ceph_pg_pool_info {
         u8 object_hash;
         u32 pg_num, pgp_num;
         int pg_num_mask, pgp_num_mask;
+        s64 read_tier;
+        s64 write_tier; /* wins for read+write ops */
         u64 flags;
         char *name;
 };
 
 struct ceph_object_locator {
-        uint64_t pool;
-        char *key;
+        s64 pool;
+};
+
+/*
+ * Maximum supported by kernel client object name length
+ *
+ * (probably outdated: must be >= RBD_MAX_MD_NAME_LEN -- currently 100)
+ */
+#define CEPH_MAX_OID_NAME_LEN 100
+
+struct ceph_object_id {
+        char name[CEPH_MAX_OID_NAME_LEN];
+        int name_len;
 };
 
 struct ceph_pg_mapping {
@@ -73,33 +86,30 @@ struct ceph_osdmap {
         struct crush_map *crush;
 };
 
-/*
- * file layout helpers
- */
-#define ceph_file_layout_su(l) ((__s32)le32_to_cpu((l).fl_stripe_unit))
-#define ceph_file_layout_stripe_count(l) \
-        ((__s32)le32_to_cpu((l).fl_stripe_count))
-#define ceph_file_layout_object_size(l) ((__s32)le32_to_cpu((l).fl_object_size))
-#define ceph_file_layout_cas_hash(l) ((__s32)le32_to_cpu((l).fl_cas_hash))
-#define ceph_file_layout_object_su(l) \
-        ((__s32)le32_to_cpu((l).fl_object_stripe_unit))
-#define ceph_file_layout_pg_pool(l) \
-        ((__s32)le32_to_cpu((l).fl_pg_pool))
-
-static inline unsigned ceph_file_layout_stripe_width(struct ceph_file_layout *l)
+static inline void ceph_oid_set_name(struct ceph_object_id *oid,
+                                     const char *name)
 {
-        return le32_to_cpu(l->fl_stripe_unit) *
-                le32_to_cpu(l->fl_stripe_count);
+        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;
 }
 
-/* "period" == bytes before i start on a new set of objects */
-static inline unsigned ceph_file_layout_period(struct ceph_file_layout *l)
+static inline void ceph_oid_copy(struct ceph_object_id *dest,
+                                 struct ceph_object_id *src)
 {
-        return le32_to_cpu(l->fl_object_size) *
-                le32_to_cpu(l->fl_stripe_count);
+        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_is_up(struct ceph_osdmap *map, int osd)
 {
         return (osd < map->max_osd) && (map->osd_state[osd] & CEPH_OSD_UP);
@@ -155,14 +165,20 @@ extern int ceph_calc_file_object_mapping(struct ceph_file_layout *layout,
                                          u64 *bno, u64 *oxoff, u64 *oxlen);
 
 /* calculate mapping of object to a placement group */
-extern int ceph_calc_ceph_pg(struct ceph_pg *pg, const char *oid,
-                          struct ceph_osdmap *osdmap, uint64_t pool);
+extern int ceph_oloc_oid_to_pg(struct ceph_osdmap *osdmap,
+                               struct ceph_object_locator *oloc,
+                               struct ceph_object_id *oid,
+                               struct ceph_pg *pg_out);
+
 extern int ceph_calc_pg_acting(struct ceph_osdmap *osdmap,
                                struct ceph_pg pgid,
                                int *acting);
 extern int ceph_calc_pg_primary(struct ceph_osdmap *osdmap,
                                 struct ceph_pg pgid);
 
+extern struct ceph_pg_pool_info *ceph_pg_pool_by_id(struct ceph_osdmap *map,
+                                                    u64 id);
+
 extern const char *ceph_pg_pool_name_by_id(struct ceph_osdmap *map, u64 id);
 extern int ceph_pg_poolid_by_name(struct ceph_osdmap *map, const char *name);
 
diff --git a/include/linux/ceph/rados.h b/include/linux/ceph/rados.h
index 68c96a508ac2..96292df4041b 100644
--- a/include/linux/ceph/rados.h
+++ b/include/linux/ceph/rados.h
@@ -344,6 +344,10 @@ enum {
         CEPH_OSD_FLAG_EXEC_PUBLIC =    0x1000,  /* DEPRECATED op may exec (public) */
         CEPH_OSD_FLAG_LOCALIZE_READS = 0x2000,  /* read from nearby replica, if any */
         CEPH_OSD_FLAG_RWORDERED =      0x4000,  /* order wrt concurrent reads */
+        CEPH_OSD_FLAG_IGNORE_CACHE =   0x8000,  /* ignore cache logic */
+        CEPH_OSD_FLAG_SKIPRWLOCKS =   0x10000,  /* skip rw locks */
+        CEPH_OSD_FLAG_IGNORE_OVERLAY = 0x20000, /* ignore pool overlay */
+        CEPH_OSD_FLAG_FLUSH =         0x40000,  /* this is part of flush */
 };
 
 enum {