include/linux/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/kref.h>
   6 #include <linux/mempool.h>
   7 #include <linux/rbtree.h>
   8
   9 #include "types.h"
  10 #include "osdmap.h"
  11 #include "messenger.h"
  12
  13 struct ceph_msg;
  14 struct ceph_snap_context;
  15 struct ceph_osd_request;
  16 struct ceph_osd_client;
  17 struct ceph_authorizer;
  18 struct ceph_pagelist;
  19
  20 /*
  21  * completion callback for async writepages
  22  */
  23 typedef void (*ceph_osdc_callback_t)(struct ceph_osd_request *,
  24                                      struct ceph_msg *);
  25
  26 /* a given osd we're communicating with */
  27 struct ceph_osd {
  28         atomic_t o_ref;
  29         struct ceph_osd_client *o_osdc;
  30         int o_osd;
  31         int o_incarnation;
  32         struct rb_node o_node;
  33         struct ceph_connection o_con;
  34         struct list_head o_requests;
  35         struct list_head o_linger_requests;
  36         struct list_head o_osd_lru;
  37         struct ceph_authorizer *o_authorizer;
  38         void *o_authorizer_buf, *o_authorizer_reply_buf;
  39         size_t o_authorizer_buf_len, o_authorizer_reply_buf_len;
  40         unsigned long lru_ttl;
  41         int o_marked_for_keepalive;
  42         struct list_head o_keepalive_item;
  43 };
  44
  45 /* an in-flight request */
  46 struct ceph_osd_request {
  47         u64             r_tid;              /* unique for this client */
  48         struct rb_node  r_node;
  49         struct list_head r_req_lru_item;
  50         struct list_head r_osd_item;
  51         struct list_head r_linger_item;
  52         struct list_head r_linger_osd;
  53         struct ceph_osd *r_osd;
  54         struct ceph_pg   r_pgid;
  55         int              r_pg_osds[CEPH_PG_MAX_SIZE];
  56         int              r_num_pg_osds;
  57
  58         struct ceph_connection *r_con_filling_msg;
  59
  60         struct ceph_msg  *r_request, *r_reply;
  61         int               r_result;
  62         int               r_flags;     /* any additional flags for the osd */
  63         u32               r_sent;      /* >0 if r_request is sending/sent */
  64         int               r_got_reply;
  65         int               r_linger;
  66
  67         struct ceph_osd_client *r_osdc;
  68         struct kref       r_kref;
  69         bool              r_mempool;
  70         struct completion r_completion, r_safe_completion;
  71         ceph_osdc_callback_t r_callback, r_safe_callback;
  72         struct ceph_eversion r_reassert_version;
  73         struct list_head  r_unsafe_item;
  74
  75         struct inode *r_inode;                /* for use by callbacks */
  76         void *r_priv;                         /* ditto */
  77
  78         char              r_oid[40];          /* object name */
  79         int               r_oid_len;
  80         unsigned long     r_stamp;            /* send OR check time */
  81
  82         struct ceph_file_layout r_file_layout;
  83         struct ceph_snap_context *r_snapc;    /* snap context for writes */
  84         unsigned          r_num_pages;        /* size of page array (follows) */
  85         unsigned          r_page_alignment;   /* io offset in first page */
  86         struct page     **r_pages;            /* pages for data payload */
  87         int               r_pages_from_pool;
  88         int               r_own_pages;        /* if true, i own page list */
  89 #ifdef CONFIG_BLOCK
  90         struct bio       *r_bio;              /* instead of pages */
  91 #endif
  92
  93         struct ceph_pagelist *r_trail;        /* trailing part of the data */
  94 };
  95
  96 struct ceph_osd_event {
  97         u64 cookie;
  98         int one_shot;
  99         struct ceph_osd_client *osdc;
 100         void (*cb)(u64, u64, u8, void *);
 101         void *data;
 102         struct rb_node node;
 103         struct list_head osd_node;
 104         struct kref kref;
 105         struct completion completion;
 106 };
 107
 108 struct ceph_osd_event_work {
 109         struct work_struct work;
 110         struct ceph_osd_event *event;
 111         u64 ver;
 112         u64 notify_id;
 113         u8 opcode;
 114 };
 115
 116 struct ceph_osd_client {
 117         struct ceph_client     *client;
 118
 119         struct ceph_osdmap     *osdmap;       /* current map */
 120         struct rw_semaphore    map_sem;
 121         struct completion      map_waiters;
 122         u64                    last_requested_map;
 123
 124         struct mutex           request_mutex;
 125         struct rb_root         osds;          /* osds */
 126         struct list_head       osd_lru;       /* idle osds */
 127         u64                    timeout_tid;   /* tid of timeout triggering rq */
 128         u64                    last_tid;      /* tid of last request */
 129         struct rb_root         requests;      /* pending requests */
 130         struct list_head       req_lru;       /* in-flight lru */
 131         struct list_head       req_unsent;    /* unsent/need-resend queue */
 132         struct list_head       req_notarget;  /* map to no osd */
 133         struct list_head       req_linger;    /* lingering requests */
 134         int                    num_requests;
 135         struct delayed_work    timeout_work;
 136         struct delayed_work    osds_timeout_work;
 137 #ifdef CONFIG_DEBUG_FS
 138         struct dentry          *debugfs_file;
 139 #endif
 140
 141         mempool_t              *req_mempool;
 142
 143         struct ceph_msgpool     msgpool_op;
 144         struct ceph_msgpool     msgpool_op_reply;
 145
 146         spinlock_t              event_lock;
 147         struct rb_root          event_tree;
 148         u64                     event_count;
 149
 150         struct workqueue_struct *notify_wq;
 151 };
 152
 153 struct ceph_osd_req_op {
 154         u16 op;           /* CEPH_OSD_OP_* */
 155         u32 flags;        /* CEPH_OSD_FLAG_* */
 156         union {
 157                 struct {
 158                         u64 offset, length;
 159                         u64 truncate_size;
 160                         u32 truncate_seq;
 161                 } extent;
 162                 struct {
 163                         const char *name;
 164                         u32 name_len;
 165                         const char  *val;
 166                         u32 value_len;
 167                         __u8 cmp_op;       /* CEPH_OSD_CMPXATTR_OP_* */
 168                         __u8 cmp_mode;     /* CEPH_OSD_CMPXATTR_MODE_* */
 169                 } xattr;
 170                 struct {
 171                         const char *class_name;
 172                         __u8 class_len;
 173                         const char *method_name;
 174                         __u8 method_len;
 175                         __u8 argc;
 176                         const char *indata;
 177                         u32 indata_len;
 178                 } cls;
 179                 struct {
 180                         u64 cookie, count;
 181                 } pgls;
 182                 struct {
 183                         u64 snapid;
 184                 } snap;
 185                 struct {
 186                         u64 cookie;
 187                         u64 ver;
 188                         __u8 flag;
 189                         u32 prot_ver;
 190                         u32 timeout;
 191                 } watch;
 192         };
 193         u32 payload_len;
 194 };
 195
 196 extern int ceph_osdc_init(struct ceph_osd_client *osdc,
 197                           struct ceph_client *client);
 198 extern void ceph_osdc_stop(struct ceph_osd_client *osdc);
 199
 200 extern void ceph_osdc_handle_reply(struct ceph_osd_client *osdc,
 201                                    struct ceph_msg *msg);
 202 extern void ceph_osdc_handle_map(struct ceph_osd_client *osdc,
 203                                  struct ceph_msg *msg);
 204
 205 extern void ceph_calc_raw_layout(struct ceph_osd_client *osdc,
 206                         struct ceph_file_layout *layout,
 207                         u64 snapid,
 208                         u64 off, u64 *plen, u64 *bno,
 209                         struct ceph_osd_request *req,
 210                         struct ceph_osd_req_op *op);
 211
 212 extern struct ceph_osd_request *ceph_osdc_alloc_request(struct ceph_osd_client *osdc,
 213                                                int flags,
 214                                                struct ceph_snap_context *snapc,
 215                                                struct ceph_osd_req_op *ops,
 216                                                bool use_mempool,
 217                                                gfp_t gfp_flags,
 218                                                struct page **pages,
 219                                                struct bio *bio);
 220
 221 extern void ceph_osdc_build_request(struct ceph_osd_request *req,
 222                                     u64 off, u64 *plen,
 223                                     struct ceph_osd_req_op *src_ops,
 224                                     struct ceph_snap_context *snapc,
 225                                     struct timespec *mtime,
 226                                     const char *oid,
 227                                     int oid_len);
 228
 229 extern struct ceph_osd_request *ceph_osdc_new_request(struct ceph_osd_client *,
 230                                       struct ceph_file_layout *layout,
 231                                       struct ceph_vino vino,
 232                                       u64 offset, u64 *len, int op, int flags,
 233                                       struct ceph_snap_context *snapc,
 234                                       int do_sync, u32 truncate_seq,
 235                                       u64 truncate_size,
 236                                       struct timespec *mtime,
 237                                       bool use_mempool, int num_reply,
 238                                       int page_align);
 239
 240 extern void ceph_osdc_set_request_linger(struct ceph_osd_client *osdc,
 241                                          struct ceph_osd_request *req);
 242 extern void ceph_osdc_unregister_linger_request(struct ceph_osd_client *osdc,
 243                                                 struct ceph_osd_request *req);
 244
 245 static inline void ceph_osdc_get_request(struct ceph_osd_request *req)
 246 {
 247         kref_get(&req->r_kref);
 248 }
 249 extern void ceph_osdc_release_request(struct kref *kref);
 250 static inline void ceph_osdc_put_request(struct ceph_osd_request *req)
 251 {
 252         kref_put(&req->r_kref, ceph_osdc_release_request);
 253 }
 254
 255 extern int ceph_osdc_start_request(struct ceph_osd_client *osdc,
 256                                    struct ceph_osd_request *req,
 257                                    bool nofail);
 258 extern int ceph_osdc_wait_request(struct ceph_osd_client *osdc,
 259                                   struct ceph_osd_request *req);
 260 extern void ceph_osdc_sync(struct ceph_osd_client *osdc);
 261
 262 extern int ceph_osdc_readpages(struct ceph_osd_client *osdc,
 263                                struct ceph_vino vino,
 264                                struct ceph_file_layout *layout,
 265                                u64 off, u64 *plen,
 266                                u32 truncate_seq, u64 truncate_size,
 267                                struct page **pages, int nr_pages,
 268                                int page_align);
 269
 270 extern int ceph_osdc_writepages(struct ceph_osd_client *osdc,
 271                                 struct ceph_vino vino,
 272                                 struct ceph_file_layout *layout,
 273                                 struct ceph_snap_context *sc,
 274                                 u64 off, u64 len,
 275                                 u32 truncate_seq, u64 truncate_size,
 276                                 struct timespec *mtime,
 277                                 struct page **pages, int nr_pages,
 278                                 int flags, int do_sync, bool nofail);
 279
 280 /* watch/notify events */
 281 extern int ceph_osdc_create_event(struct ceph_osd_client *osdc,
 282                                   void (*event_cb)(u64, u64, u8, void *),
 283                                   int one_shot, void *data,
 284                                   struct ceph_osd_event **pevent);
 285 extern void ceph_osdc_cancel_event(struct ceph_osd_event *event);
 286 extern int ceph_osdc_wait_event(struct ceph_osd_event *event,
 287                                 unsigned long timeout);
 288 extern void ceph_osdc_put_event(struct ceph_osd_event *event);
 289 #endif
 290