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 /*
  16  * Maximum object name size
  17  * (must be at least as big as RBD_MAX_MD_NAME_LEN -- currently 100)
  18  */
  19 #define MAX_OBJ_NAME_SIZE 100
  20
  21 struct ceph_msg;
  22 struct ceph_snap_context;
  23 struct ceph_osd_request;
  24 struct ceph_osd_client;
  25 struct ceph_authorizer;
  26
  27 /*
  28  * completion callback for async writepages
  29  */
  30 typedef void (*ceph_osdc_callback_t)(struct ceph_osd_request *,
  31                                      struct ceph_msg *);
  32
  33 /* a given osd we're communicating with */
  34 struct ceph_osd {
  35         atomic_t o_ref;
  36         struct ceph_osd_client *o_osdc;
  37         int o_osd;
  38         int o_incarnation;
  39         struct rb_node o_node;
  40         struct ceph_connection o_con;
  41         struct list_head o_requests;
  42         struct list_head o_linger_requests;
  43         struct list_head o_osd_lru;
  44         struct ceph_auth_handshake o_auth;
  45         unsigned long lru_ttl;
  46         int o_marked_for_keepalive;
  47         struct list_head o_keepalive_item;
  48 };
  49
  50
  51 #define CEPH_OSD_MAX_OP 10
  52
  53 /* an in-flight request */
  54 struct ceph_osd_request {
  55         u64             r_tid;              /* unique for this client */
  56         struct rb_node  r_node;
  57         struct list_head r_req_lru_item;
  58         struct list_head r_osd_item;
  59         struct list_head r_linger_item;
  60         struct list_head r_linger_osd;
  61         struct ceph_osd *r_osd;
  62         struct ceph_pg   r_pgid;
  63         int              r_pg_osds[CEPH_PG_MAX_SIZE];
  64         int              r_num_pg_osds;
  65
  66         struct ceph_connection *r_con_filling_msg;
  67
  68         struct ceph_msg  *r_request, *r_reply;
  69         int               r_flags;     /* any additional flags for the osd */
  70         u32               r_sent;      /* >0 if r_request is sending/sent */
  71         int               r_num_ops;
  72
  73         /* encoded message content */
  74         struct ceph_osd_op *r_request_ops;
  75         /* these are updated on each send */
  76         __le32           *r_request_osdmap_epoch;
  77         __le32           *r_request_flags;
  78         __le64           *r_request_pool;
  79         void             *r_request_pgid;
  80         __le32           *r_request_attempts;
  81         struct ceph_eversion *r_request_reassert_version;
  82
  83         int               r_result;
  84         int               r_reply_op_len[CEPH_OSD_MAX_OP];
  85         s32               r_reply_op_result[CEPH_OSD_MAX_OP];
  86         int               r_got_reply;
  87         int               r_linger;
  88
  89         struct ceph_osd_client *r_osdc;
  90         struct kref       r_kref;
  91         bool              r_mempool;
  92         struct completion r_completion, r_safe_completion;
  93         ceph_osdc_callback_t r_callback, r_safe_callback;
  94         struct ceph_eversion r_reassert_version;
  95         struct list_head  r_unsafe_item;
  96
  97         struct inode *r_inode;                /* for use by callbacks */
  98         void *r_priv;                         /* ditto */
  99
 100         char              r_oid[MAX_OBJ_NAME_SIZE];          /* object name */
 101         int               r_oid_len;
 102         u64               r_snapid;
 103         unsigned long     r_stamp;            /* send OR check time */
 104
 105         struct ceph_file_layout r_file_layout;
 106         struct ceph_snap_context *r_snapc;    /* snap context for writes */
 107         unsigned          r_num_pages;        /* size of page array (follows) */
 108         unsigned          r_page_alignment;   /* io offset in first page */
 109         struct page     **r_pages;            /* pages for data payload */
 110         int               r_pages_from_pool;
 111         int               r_own_pages;        /* if true, i own page list */
 112 #ifdef CONFIG_BLOCK
 113         struct bio       *r_bio;              /* instead of pages */
 114 #endif
 115
 116         struct ceph_pagelist r_trail;         /* trailing part of the data */
 117 };
 118
 119 struct ceph_osd_event {
 120         u64 cookie;
 121         int one_shot;
 122         struct ceph_osd_client *osdc;
 123         void (*cb)(u64, u64, u8, void *);
 124         void *data;
 125         struct rb_node node;
 126         struct list_head osd_node;
 127         struct kref kref;
 128 };
 129
 130 struct ceph_osd_event_work {
 131         struct work_struct work;
 132         struct ceph_osd_event *event;
 133         u64 ver;
 134         u64 notify_id;
 135         u8 opcode;
 136 };
 137
 138 struct ceph_osd_client {
 139         struct ceph_client     *client;
 140
 141         struct ceph_osdmap     *osdmap;       /* current map */
 142         struct rw_semaphore    map_sem;
 143         struct completion      map_waiters;
 144         u64                    last_requested_map;
 145
 146         struct mutex           request_mutex;
 147         struct rb_root         osds;          /* osds */
 148         struct list_head       osd_lru;       /* idle osds */
 149         u64                    timeout_tid;   /* tid of timeout triggering rq */
 150         u64                    last_tid;      /* tid of last request */
 151         struct rb_root         requests;      /* pending requests */
 152         struct list_head       req_lru;       /* in-flight lru */
 153         struct list_head       req_unsent;    /* unsent/need-resend queue */
 154         struct list_head       req_notarget;  /* map to no osd */
 155         struct list_head       req_linger;    /* lingering requests */
 156         int                    num_requests;
 157         struct delayed_work    timeout_work;
 158         struct delayed_work    osds_timeout_work;
 159 #ifdef CONFIG_DEBUG_FS
 160         struct dentry          *debugfs_file;
 161 #endif
 162
 163         mempool_t              *req_mempool;
 164
 165         struct ceph_msgpool     msgpool_op;
 166         struct ceph_msgpool     msgpool_op_reply;
 167
 168         spinlock_t              event_lock;
 169         struct rb_root          event_tree;
 170         u64                     event_count;
 171
 172         struct workqueue_struct *notify_wq;
 173 };
 174
 175 struct ceph_osd_req_op {
 176         u16 op;           /* CEPH_OSD_OP_* */
 177         u32 payload_len;
 178         union {
 179                 struct {
 180                         u64 offset, length;
 181                         u64 truncate_size;
 182                         u32 truncate_seq;
 183                 } extent;
 184                 struct {
 185                         const char *name;
 186                         const char  *val;
 187                         u32 name_len;
 188                         u32 value_len;
 189                         __u8 cmp_op;       /* CEPH_OSD_CMPXATTR_OP_* */
 190                         __u8 cmp_mode;     /* CEPH_OSD_CMPXATTR_MODE_* */
 191                 } xattr;
 192                 struct {
 193                         const char *class_name;
 194                         const char *method_name;
 195                         const char *indata;
 196                         u32 indata_len;
 197                         __u8 class_len;
 198                         __u8 method_len;
 199                         __u8 argc;
 200                 } cls;
 201                 struct {
 202                         u64 cookie;
 203                         u64 count;
 204                 } pgls;
 205                 struct {
 206                         u64 snapid;
 207                 } snap;
 208                 struct {
 209                         u64 cookie;
 210                         u64 ver;
 211                         u32 prot_ver;
 212                         u32 timeout;
 213                         __u8 flag;
 214                 } watch;
 215         };
 216 };
 217
 218 extern int ceph_osdc_init(struct ceph_osd_client *osdc,
 219                           struct ceph_client *client);
 220 extern void ceph_osdc_stop(struct ceph_osd_client *osdc);
 221
 222 extern void ceph_osdc_handle_reply(struct ceph_osd_client *osdc,
 223                                    struct ceph_msg *msg);
 224 extern void ceph_osdc_handle_map(struct ceph_osd_client *osdc,
 225                                  struct ceph_msg *msg);
 226
 227 extern struct ceph_osd_request *ceph_osdc_alloc_request(struct ceph_osd_client *osdc,
 228                                                struct ceph_snap_context *snapc,
 229                                                unsigned int num_op,
 230                                                bool use_mempool,
 231                                                gfp_t gfp_flags);
 232
 233 extern void ceph_osdc_build_request(struct ceph_osd_request *req,
 234                                     u64 off, u64 len,
 235                                     unsigned int num_op,
 236                                     struct ceph_osd_req_op *src_ops,
 237                                     struct ceph_snap_context *snapc,
 238                                     u64 snap_id,
 239                                     struct timespec *mtime);
 240
 241 extern struct ceph_osd_request *ceph_osdc_new_request(struct ceph_osd_client *,
 242                                       struct ceph_file_layout *layout,
 243                                       struct ceph_vino vino,
 244                                       u64 offset, u64 *len, int op, int flags,
 245                                       struct ceph_snap_context *snapc,
 246                                       int do_sync, u32 truncate_seq,
 247                                       u64 truncate_size,
 248                                       struct timespec *mtime,
 249                                       bool use_mempool, int page_align);
 250
 251 extern void ceph_osdc_set_request_linger(struct ceph_osd_client *osdc,
 252                                          struct ceph_osd_request *req);
 253 extern void ceph_osdc_unregister_linger_request(struct ceph_osd_client *osdc,
 254                                                 struct ceph_osd_request *req);
 255
 256 static inline void ceph_osdc_get_request(struct ceph_osd_request *req)
 257 {
 258         kref_get(&req->r_kref);
 259 }
 260 extern void ceph_osdc_release_request(struct kref *kref);
 261 static inline void ceph_osdc_put_request(struct ceph_osd_request *req)
 262 {
 263         kref_put(&req->r_kref, ceph_osdc_release_request);
 264 }
 265
 266 extern int ceph_osdc_start_request(struct ceph_osd_client *osdc,
 267                                    struct ceph_osd_request *req,
 268                                    bool nofail);
 269 extern int ceph_osdc_wait_request(struct ceph_osd_client *osdc,
 270                                   struct ceph_osd_request *req);
 271 extern void ceph_osdc_sync(struct ceph_osd_client *osdc);
 272
 273 extern int ceph_osdc_readpages(struct ceph_osd_client *osdc,
 274                                struct ceph_vino vino,
 275                                struct ceph_file_layout *layout,
 276                                u64 off, u64 *plen,
 277                                u32 truncate_seq, u64 truncate_size,
 278                                struct page **pages, int nr_pages,
 279                                int page_align);
 280
 281 extern int ceph_osdc_writepages(struct ceph_osd_client *osdc,
 282                                 struct ceph_vino vino,
 283                                 struct ceph_file_layout *layout,
 284                                 struct ceph_snap_context *sc,
 285                                 u64 off, u64 len,
 286                                 u32 truncate_seq, u64 truncate_size,
 287                                 struct timespec *mtime,
 288                                 struct page **pages, int nr_pages);
 289
 290 /* watch/notify events */
 291 extern int ceph_osdc_create_event(struct ceph_osd_client *osdc,
 292                                   void (*event_cb)(u64, u64, u8, void *),
 293                                   void *data, struct ceph_osd_event **pevent);
 294 extern void ceph_osdc_cancel_event(struct ceph_osd_event *event);
 295 extern void ceph_osdc_put_event(struct ceph_osd_event *event);
 296 #endif
 297