fs/ceph/osd_client.h

   1 #ifndef _FS_CEPH_OSD_CLIENT_H
   2 #define _FS_CEPH_OSD_CLIENT_H
   3
   4 #include <linux/completion.h>
   5 #include <linux/mempool.h>
   6 #include <linux/rbtree.h>
   7
   8 #include "types.h"
   9 #include "osdmap.h"
  10 #include "messenger.h"
  11
  12 struct ceph_msg;
  13 struct ceph_snap_context;
  14 struct ceph_osd_request;
  15 struct ceph_osd_client;
  16
  17 /*
  18  * completion callback for async writepages
  19  */
  20 typedef void (*ceph_osdc_callback_t)(struct ceph_osd_request *,
  21                                      struct ceph_msg *);
  22
  23 /* a given osd we're communicating with */
  24 struct ceph_osd {
  25         atomic_t o_ref;
  26         struct ceph_osd_client *o_osdc;
  27         int o_osd;
  28         int o_incarnation;
  29         struct rb_node o_node;
  30         struct ceph_connection o_con;
  31         struct list_head o_requests;
  32 };
  33
  34 /* an in-flight request */
  35 struct ceph_osd_request {
  36         u64             r_tid;              /* unique for this client */
  37         struct rb_node  r_node;
  38         struct list_head r_osd_item;
  39         struct ceph_osd *r_osd;
  40
  41         struct ceph_msg  *r_request, *r_reply;
  42         int               r_result;
  43         int               r_flags;     /* any additional flags for the osd */
  44         u32               r_sent;      /* >0 if r_request is sending/sent */
  45         int r_prepared_pages, r_got_reply;
  46
  47         struct ceph_osd_client *r_osdc;
  48         atomic_t          r_ref;
  49         bool              r_mempool;
  50         struct completion r_completion, r_safe_completion;
  51         ceph_osdc_callback_t r_callback, r_safe_callback;
  52         struct ceph_eversion r_reassert_version;
  53         struct list_head  r_unsafe_item;
  54
  55         struct inode *r_inode;                /* for use by callbacks */
  56         struct writeback_control *r_wbc;      /* ditto */
  57
  58         char              r_oid[40];          /* object name */
  59         int               r_oid_len;
  60         unsigned long     r_timeout_stamp;
  61         bool              r_resend;           /* msg send failed, needs retry */
  62
  63         struct ceph_file_layout r_file_layout;
  64         struct ceph_snap_context *r_snapc;    /* snap context for writes */
  65         unsigned          r_num_pages;        /* size of page array (follows) */
  66         struct page     **r_pages;            /* pages for data payload */
  67         int               r_pages_from_pool;
  68         int               r_own_pages;        /* if true, i own page list */
  69 };
  70
  71 struct ceph_osd_client {
  72         struct ceph_client     *client;
  73
  74         struct ceph_osdmap     *osdmap;       /* current map */
  75         struct rw_semaphore    map_sem;
  76         struct completion      map_waiters;
  77         u64                    last_requested_map;
  78
  79         struct mutex           request_mutex;
  80         struct rb_root         osds;          /* osds */
  81         u64                    timeout_tid;   /* tid of timeout triggering rq */
  82         u64                    last_tid;      /* tid of last request */
  83         struct rb_root         requests;      /* pending requests */
  84         int                    num_requests;
  85         struct delayed_work    timeout_work;
  86         struct dentry          *debugfs_file;
  87
  88         mempool_t              *req_mempool;
  89
  90         struct ceph_msgpool   msgpool_op;
  91         struct ceph_msgpool   msgpool_op_reply;
  92 };
  93
  94 extern int ceph_osdc_init(struct ceph_osd_client *osdc,
  95                           struct ceph_client *client);
  96 extern void ceph_osdc_stop(struct ceph_osd_client *osdc);
  97
  98 extern void ceph_osdc_handle_reply(struct ceph_osd_client *osdc,
  99                                    struct ceph_msg *msg);
 100 extern void ceph_osdc_handle_map(struct ceph_osd_client *osdc,
 101                                  struct ceph_msg *msg);
 102
 103 extern struct ceph_osd_request *ceph_osdc_new_request(struct ceph_osd_client *,
 104                                       struct ceph_file_layout *layout,
 105                                       struct ceph_vino vino,
 106                                       u64 offset, u64 *len, int op, int flags,
 107                                       struct ceph_snap_context *snapc,
 108                                       int do_sync, u32 truncate_seq,
 109                                       u64 truncate_size,
 110                                       struct timespec *mtime,
 111                                       bool use_mempool, int num_reply);
 112
 113 static inline void ceph_osdc_get_request(struct ceph_osd_request *req)
 114 {
 115         atomic_inc(&req->r_ref);
 116 }
 117 extern void ceph_osdc_put_request(struct ceph_osd_request *req);
 118
 119 extern int ceph_osdc_start_request(struct ceph_osd_client *osdc,
 120                                    struct ceph_osd_request *req,
 121                                    bool nofail);
 122 extern int ceph_osdc_wait_request(struct ceph_osd_client *osdc,
 123                                   struct ceph_osd_request *req);
 124 extern void ceph_osdc_sync(struct ceph_osd_client *osdc);
 125
 126 extern int ceph_osdc_readpages(struct ceph_osd_client *osdc,
 127                                struct ceph_vino vino,
 128                                struct ceph_file_layout *layout,
 129                                u64 off, u64 *plen,
 130                                u32 truncate_seq, u64 truncate_size,
 131                                struct page **pages, int nr_pages);
 132
 133 extern int ceph_osdc_writepages(struct ceph_osd_client *osdc,
 134                                 struct ceph_vino vino,
 135                                 struct ceph_file_layout *layout,
 136                                 struct ceph_snap_context *sc,
 137                                 u64 off, u64 len,
 138                                 u32 truncate_seq, u64 truncate_size,
 139                                 struct timespec *mtime,
 140                                 struct page **pages, int nr_pages,
 141                                 int flags, int do_sync, bool nofail);
 142
 143 #endif
 144