kernel/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 <linux/ceph/types.h>
  10 #include <linux/ceph/osdmap.h>
  11 #include <linux/ceph/messenger.h>
  12 #include <linux/ceph/auth.h>
  13 #include <linux/ceph/pagelist.h>
  14
  15 struct ceph_msg;
  16 struct ceph_snap_context;
  17 struct ceph_osd_request;
  18 struct ceph_osd_client;
  19 struct ceph_authorizer;
  20
  21 /*
  22  * completion callback for async writepages
  23  */
  24 typedef void (*ceph_osdc_callback_t)(struct ceph_osd_request *,
  25                                      struct ceph_msg *);
  26 typedef void (*ceph_osdc_unsafe_callback_t)(struct ceph_osd_request *, bool);
  27
  28 /* a given osd we're communicating with */
  29 struct ceph_osd {
  30         atomic_t o_ref;
  31         struct ceph_osd_client *o_osdc;
  32         int o_osd;
  33         int o_incarnation;
  34         struct rb_node o_node;
  35         struct ceph_connection o_con;
  36         struct list_head o_requests;
  37         struct list_head o_linger_requests;
  38         struct list_head o_osd_lru;
  39         struct ceph_auth_handshake o_auth;
  40         unsigned long lru_ttl;
  41         int o_marked_for_keepalive;
  42         struct list_head o_keepalive_item;
  43 };
  44
  45
  46 #define CEPH_OSD_MAX_OP 3
  47
  48 enum ceph_osd_data_type {
  49         CEPH_OSD_DATA_TYPE_NONE = 0,
  50         CEPH_OSD_DATA_TYPE_PAGES,
  51         CEPH_OSD_DATA_TYPE_PAGELIST,
  52 #ifdef CONFIG_BLOCK
  53         CEPH_OSD_DATA_TYPE_BIO,
  54 #endif /* CONFIG_BLOCK */
  55 };
  56
  57 struct ceph_osd_data {
  58         enum ceph_osd_data_type type;
  59         union {
  60                 struct {
  61                         struct page     **pages;
  62                         u64             length;
  63                         u32             alignment;
  64                         bool            pages_from_pool;
  65                         bool            own_pages;
  66                 };
  67                 struct ceph_pagelist    *pagelist;
  68 #ifdef CONFIG_BLOCK
  69                 struct {
  70                         struct bio      *bio;           /* list of bios */
  71                         size_t          bio_length;     /* total in list */
  72                 };
  73 #endif /* CONFIG_BLOCK */
  74         };
  75 };
  76
  77 struct ceph_osd_req_op {
  78         u16 op;           /* CEPH_OSD_OP_* */
  79         u32 flags;        /* CEPH_OSD_OP_FLAG_* */
  80         u32 payload_len;
  81         union {
  82                 struct ceph_osd_data raw_data_in;
  83                 struct {
  84                         u64 offset, length;
  85                         u64 truncate_size;
  86                         u32 truncate_seq;
  87                         struct ceph_osd_data osd_data;
  88                 } extent;
  89                 struct {
  90                         u32 name_len;
  91                         u32 value_len;
  92                         __u8 cmp_op;       /* CEPH_OSD_CMPXATTR_OP_* */
  93                         __u8 cmp_mode;     /* CEPH_OSD_CMPXATTR_MODE_* */
  94                         struct ceph_osd_data osd_data;
  95                 } xattr;
  96                 struct {
  97                         const char *class_name;
  98                         const char *method_name;
  99                         struct ceph_osd_data request_info;
 100                         struct ceph_osd_data request_data;
 101                         struct ceph_osd_data response_data;
 102                         __u8 class_len;
 103                         __u8 method_len;
 104                         __u8 argc;
 105                 } cls;
 106                 struct {
 107                         u64 cookie;
 108                         u64 ver;
 109                         u32 prot_ver;
 110                         u32 timeout;
 111                         __u8 flag;
 112                 } watch;
 113                 struct {
 114                         u64 expected_object_size;
 115                         u64 expected_write_size;
 116                 } alloc_hint;
 117         };
 118 };
 119
 120 /* an in-flight request */
 121 struct ceph_osd_request {
 122         u64             r_tid;              /* unique for this client */
 123         struct rb_node  r_node;
 124         struct list_head r_req_lru_item;
 125         struct list_head r_osd_item;
 126         struct list_head r_linger_item;
 127         struct list_head r_linger_osd_item;
 128         struct ceph_osd *r_osd;
 129         struct ceph_pg   r_pgid;
 130         int              r_pg_osds[CEPH_PG_MAX_SIZE];
 131         int              r_num_pg_osds;
 132
 133         struct ceph_msg  *r_request, *r_reply;
 134         int               r_flags;     /* any additional flags for the osd */
 135         u32               r_sent;      /* >0 if r_request is sending/sent */
 136
 137         /* request osd ops array  */
 138         unsigned int            r_num_ops;
 139         struct ceph_osd_req_op  r_ops[CEPH_OSD_MAX_OP];
 140
 141         /* these are updated on each send */
 142         __le32           *r_request_osdmap_epoch;
 143         __le32           *r_request_flags;
 144         __le64           *r_request_pool;
 145         void             *r_request_pgid;
 146         __le32           *r_request_attempts;
 147         bool              r_paused;
 148         struct ceph_eversion *r_request_reassert_version;
 149
 150         int               r_result;
 151         int               r_reply_op_len[CEPH_OSD_MAX_OP];
 152         s32               r_reply_op_result[CEPH_OSD_MAX_OP];
 153         int               r_got_reply;
 154         int               r_linger;
 155
 156         struct ceph_osd_client *r_osdc;
 157         struct kref       r_kref;
 158         bool              r_mempool;
 159         struct completion r_completion, r_safe_completion;
 160         ceph_osdc_callback_t r_callback;
 161         ceph_osdc_unsafe_callback_t r_unsafe_callback;
 162         struct ceph_eversion r_reassert_version;
 163         struct list_head  r_unsafe_item;
 164
 165         struct inode *r_inode;                /* for use by callbacks */
 166         void *r_priv;                         /* ditto */
 167
 168         struct ceph_object_locator r_base_oloc;
 169         struct ceph_object_id r_base_oid;
 170         struct ceph_object_locator r_target_oloc;
 171         struct ceph_object_id r_target_oid;
 172
 173         u64               r_snapid;
 174         unsigned long     r_stamp;            /* send OR check time */
 175
 176         struct ceph_snap_context *r_snapc;    /* snap context for writes */
 177 };
 178
 179 struct ceph_request_redirect {
 180         struct ceph_object_locator oloc;
 181 };
 182
 183 struct ceph_osd_event {
 184         u64 cookie;
 185         int one_shot;
 186         struct ceph_osd_client *osdc;
 187         void (*cb)(u64, u64, u8, void *);
 188         void *data;
 189         struct rb_node node;
 190         struct list_head osd_node;
 191         struct kref kref;
 192 };
 193
 194 struct ceph_osd_event_work {
 195         struct work_struct work;
 196         struct ceph_osd_event *event;
 197         u64 ver;
 198         u64 notify_id;
 199         u8 opcode;
 200 };
 201
 202 struct ceph_osd_client {
 203         struct ceph_client     *client;
 204
 205         struct ceph_osdmap     *osdmap;       /* current map */
 206         struct rw_semaphore    map_sem;
 207         struct completion      map_waiters;
 208         u64                    last_requested_map;
 209
 210         struct mutex           request_mutex;
 211         struct rb_root         osds;          /* osds */
 212         struct list_head       osd_lru;       /* idle osds */
 213         u64                    timeout_tid;   /* tid of timeout triggering rq */
 214         u64                    last_tid;      /* tid of last request */
 215         struct rb_root         requests;      /* pending requests */
 216         struct list_head       req_lru;       /* in-flight lru */
 217         struct list_head       req_unsent;    /* unsent/need-resend queue */
 218         struct list_head       req_notarget;  /* map to no osd */
 219         struct list_head       req_linger;    /* lingering requests */
 220         int                    num_requests;
 221         struct delayed_work    timeout_work;
 222         struct delayed_work    osds_timeout_work;
 223 #ifdef CONFIG_DEBUG_FS
 224         struct dentry          *debugfs_file;
 225 #endif
 226
 227         mempool_t              *req_mempool;
 228
 229         struct ceph_msgpool     msgpool_op;
 230         struct ceph_msgpool     msgpool_op_reply;
 231
 232         spinlock_t              event_lock;
 233         struct rb_root          event_tree;
 234         u64                     event_count;
 235
 236         struct workqueue_struct *notify_wq;
 237 };
 238
 239 extern int ceph_osdc_setup(void);
 240 extern void ceph_osdc_cleanup(void);
 241
 242 extern int ceph_osdc_init(struct ceph_osd_client *osdc,
 243                           struct ceph_client *client);
 244 extern void ceph_osdc_stop(struct ceph_osd_client *osdc);
 245
 246 extern void ceph_osdc_handle_reply(struct ceph_osd_client *osdc,
 247                                    struct ceph_msg *msg);
 248 extern void ceph_osdc_handle_map(struct ceph_osd_client *osdc,
 249                                  struct ceph_msg *msg);
 250
 251 extern void osd_req_op_init(struct ceph_osd_request *osd_req,
 252                                         unsigned int which, u16 opcode);
 253
 254 extern void osd_req_op_raw_data_in_pages(struct ceph_osd_request *,
 255                                         unsigned int which,
 256                                         struct page **pages, u64 length,
 257                                         u32 alignment, bool pages_from_pool,
 258                                         bool own_pages);
 259
 260 extern void osd_req_op_extent_init(struct ceph_osd_request *osd_req,
 261                                         unsigned int which, u16 opcode,
 262                                         u64 offset, u64 length,
 263                                         u64 truncate_size, u32 truncate_seq);
 264 extern void osd_req_op_extent_update(struct ceph_osd_request *osd_req,
 265                                         unsigned int which, u64 length);
 266
 267 extern struct ceph_osd_data *osd_req_op_extent_osd_data(
 268                                         struct ceph_osd_request *osd_req,
 269                                         unsigned int which);
 270 extern struct ceph_osd_data *osd_req_op_cls_response_data(
 271                                         struct ceph_osd_request *osd_req,
 272                                         unsigned int which);
 273
 274 extern void osd_req_op_extent_osd_data_pages(struct ceph_osd_request *,
 275                                         unsigned int which,
 276                                         struct page **pages, u64 length,
 277                                         u32 alignment, bool pages_from_pool,
 278                                         bool own_pages);
 279 extern void osd_req_op_extent_osd_data_pagelist(struct ceph_osd_request *,
 280                                         unsigned int which,
 281                                         struct ceph_pagelist *pagelist);
 282 #ifdef CONFIG_BLOCK
 283 extern void osd_req_op_extent_osd_data_bio(struct ceph_osd_request *,
 284                                         unsigned int which,
 285                                         struct bio *bio, size_t bio_length);
 286 #endif /* CONFIG_BLOCK */
 287
 288 extern void osd_req_op_cls_request_data_pagelist(struct ceph_osd_request *,
 289                                         unsigned int which,
 290                                         struct ceph_pagelist *pagelist);
 291 extern void osd_req_op_cls_request_data_pages(struct ceph_osd_request *,
 292                                         unsigned int which,
 293                                         struct page **pages, u64 length,
 294                                         u32 alignment, bool pages_from_pool,
 295                                         bool own_pages);
 296 extern void osd_req_op_cls_response_data_pages(struct ceph_osd_request *,
 297                                         unsigned int which,
 298                                         struct page **pages, u64 length,
 299                                         u32 alignment, bool pages_from_pool,
 300                                         bool own_pages);
 301
 302 extern void osd_req_op_cls_init(struct ceph_osd_request *osd_req,
 303                                         unsigned int which, u16 opcode,
 304                                         const char *class, const char *method);
 305 extern int osd_req_op_xattr_init(struct ceph_osd_request *osd_req, unsigned int which,
 306                                  u16 opcode, const char *name, const void *value,
 307                                  size_t size, u8 cmp_op, u8 cmp_mode);
 308 extern void osd_req_op_watch_init(struct ceph_osd_request *osd_req,
 309                                         unsigned int which, u16 opcode,
 310                                         u64 cookie, u64 version, int flag);
 311 extern void osd_req_op_alloc_hint_init(struct ceph_osd_request *osd_req,
 312                                        unsigned int which,
 313                                        u64 expected_object_size,
 314                                        u64 expected_write_size);
 315
 316 extern struct ceph_osd_request *ceph_osdc_alloc_request(struct ceph_osd_client *osdc,
 317                                                struct ceph_snap_context *snapc,
 318                                                unsigned int num_ops,
 319                                                bool use_mempool,
 320                                                gfp_t gfp_flags);
 321
 322 extern void ceph_osdc_build_request(struct ceph_osd_request *req, u64 off,
 323                                     struct ceph_snap_context *snapc,
 324                                     u64 snap_id,
 325                                     struct timespec *mtime);
 326
 327 extern struct ceph_osd_request *ceph_osdc_new_request(struct ceph_osd_client *,
 328                                       struct ceph_file_layout *layout,
 329                                       struct ceph_vino vino,
 330                                       u64 offset, u64 *len,
 331                                       unsigned int which, int num_ops,
 332                                       int opcode, int flags,
 333                                       struct ceph_snap_context *snapc,
 334                                       u32 truncate_seq, u64 truncate_size,
 335                                       bool use_mempool);
 336
 337 extern void ceph_osdc_set_request_linger(struct ceph_osd_client *osdc,
 338                                          struct ceph_osd_request *req);
 339
 340 extern void ceph_osdc_get_request(struct ceph_osd_request *req);
 341 extern void ceph_osdc_put_request(struct ceph_osd_request *req);
 342
 343 extern int ceph_osdc_start_request(struct ceph_osd_client *osdc,
 344                                    struct ceph_osd_request *req,
 345                                    bool nofail);
 346 extern void ceph_osdc_cancel_request(struct ceph_osd_request *req);
 347 extern int ceph_osdc_wait_request(struct ceph_osd_client *osdc,
 348                                   struct ceph_osd_request *req);
 349 extern void ceph_osdc_sync(struct ceph_osd_client *osdc);
 350
 351 extern void ceph_osdc_flush_notifies(struct ceph_osd_client *osdc);
 352
 353 extern int ceph_osdc_readpages(struct ceph_osd_client *osdc,
 354                                struct ceph_vino vino,
 355                                struct ceph_file_layout *layout,
 356                                u64 off, u64 *plen,
 357                                u32 truncate_seq, u64 truncate_size,
 358                                struct page **pages, int nr_pages,
 359                                int page_align);
 360
 361 extern int ceph_osdc_writepages(struct ceph_osd_client *osdc,
 362                                 struct ceph_vino vino,
 363                                 struct ceph_file_layout *layout,
 364                                 struct ceph_snap_context *sc,
 365                                 u64 off, u64 len,
 366                                 u32 truncate_seq, u64 truncate_size,
 367                                 struct timespec *mtime,
 368                                 struct page **pages, int nr_pages);
 369
 370 /* watch/notify events */
 371 extern int ceph_osdc_create_event(struct ceph_osd_client *osdc,
 372                                   void (*event_cb)(u64, u64, u8, void *),
 373                                   void *data, struct ceph_osd_event **pevent);
 374 extern void ceph_osdc_cancel_event(struct ceph_osd_event *event);
 375 extern void ceph_osdc_put_event(struct ceph_osd_event *event);
 376 #endif
 377