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osd_client.h
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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 
14 /*
15  * Maximum object name size
16  * (must be at least as big as RBD_MAX_MD_NAME_LEN -- currently 100)
17  */
18 #define MAX_OBJ_NAME_SIZE 100
19 
20 struct ceph_msg;
21 struct ceph_snap_context;
22 struct ceph_osd_request;
23 struct ceph_osd_client;
24 struct ceph_authorizer;
25 struct ceph_pagelist;
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 /* an in-flight request */
51 struct ceph_osd_request {
52  u64 r_tid; /* unique for this client */
53  struct rb_node r_node;
54  struct list_head r_req_lru_item;
55  struct list_head r_osd_item;
56  struct list_head r_linger_item;
57  struct list_head r_linger_osd;
58  struct ceph_osd *r_osd;
59  struct ceph_pg r_pgid;
60  int r_pg_osds[CEPH_PG_MAX_SIZE];
61  int r_num_pg_osds;
62 
63  struct ceph_connection *r_con_filling_msg;
64 
65  struct ceph_msg *r_request, *r_reply;
66  int r_result;
67  int r_flags; /* any additional flags for the osd */
68  u32 r_sent; /* >0 if r_request is sending/sent */
69  int r_got_reply;
70  int r_linger;
71 
72  struct ceph_osd_client *r_osdc;
73  struct kref r_kref;
74  bool r_mempool;
75  struct completion r_completion, r_safe_completion;
76  ceph_osdc_callback_t r_callback, r_safe_callback;
77  struct ceph_eversion r_reassert_version;
78  struct list_head r_unsafe_item;
79 
80  struct inode *r_inode; /* for use by callbacks */
81  void *r_priv; /* ditto */
82 
83  char r_oid[MAX_OBJ_NAME_SIZE]; /* object name */
84  int r_oid_len;
85  unsigned long r_stamp; /* send OR check time */
86 
87  struct ceph_file_layout r_file_layout;
88  struct ceph_snap_context *r_snapc; /* snap context for writes */
89  unsigned r_num_pages; /* size of page array (follows) */
90  unsigned r_page_alignment; /* io offset in first page */
91  struct page **r_pages; /* pages for data payload */
92  int r_pages_from_pool;
93  int r_own_pages; /* if true, i own page list */
94 #ifdef CONFIG_BLOCK
95  struct bio *r_bio; /* instead of pages */
96 #endif
97 
98  struct ceph_pagelist *r_trail; /* trailing part of the data */
99 };
100 
101 struct ceph_osd_event {
102  u64 cookie;
103  int one_shot;
104  struct ceph_osd_client *osdc;
105  void (*cb)(u64, u64, u8, void *);
106  void *data;
107  struct rb_node node;
108  struct list_head osd_node;
109  struct kref kref;
110  struct completion completion;
111 };
112 
113 struct ceph_osd_event_work {
114  struct work_struct work;
115  struct ceph_osd_event *event;
116  u64 ver;
117  u64 notify_id;
118  u8 opcode;
119 };
120 
121 struct ceph_osd_client {
122  struct ceph_client *client;
123 
124  struct ceph_osdmap *osdmap; /* current map */
125  struct rw_semaphore map_sem;
126  struct completion map_waiters;
127  u64 last_requested_map;
128 
129  struct mutex request_mutex;
130  struct rb_root osds; /* osds */
131  struct list_head osd_lru; /* idle osds */
132  u64 timeout_tid; /* tid of timeout triggering rq */
133  u64 last_tid; /* tid of last request */
134  struct rb_root requests; /* pending requests */
135  struct list_head req_lru; /* in-flight lru */
136  struct list_head req_unsent; /* unsent/need-resend queue */
137  struct list_head req_notarget; /* map to no osd */
138  struct list_head req_linger; /* lingering requests */
139  int num_requests;
140  struct delayed_work timeout_work;
141  struct delayed_work osds_timeout_work;
142 #ifdef CONFIG_DEBUG_FS
143  struct dentry *debugfs_file;
144 #endif
145 
146  mempool_t *req_mempool;
147 
148  struct ceph_msgpool msgpool_op;
149  struct ceph_msgpool msgpool_op_reply;
150 
151  spinlock_t event_lock;
152  struct rb_root event_tree;
153  u64 event_count;
154 
155  struct workqueue_struct *notify_wq;
156 };
157 
158 struct ceph_osd_req_op {
159  u16 op; /* CEPH_OSD_OP_* */
160  u32 flags; /* CEPH_OSD_FLAG_* */
161  union {
162  struct {
163  u64 offset, length;
164  u64 truncate_size;
165  u32 truncate_seq;
166  } extent;
167  struct {
168  const char *name;
169  u32 name_len;
170  const char *val;
171  u32 value_len;
172  __u8 cmp_op; /* CEPH_OSD_CMPXATTR_OP_* */
173  __u8 cmp_mode; /* CEPH_OSD_CMPXATTR_MODE_* */
174  } xattr;
175  struct {
176  const char *class_name;
177  __u8 class_len;
178  const char *method_name;
179  __u8 method_len;
180  __u8 argc;
181  const char *indata;
182  u32 indata_len;
183  } cls;
184  struct {
185  u64 cookie, count;
186  } pgls;
187  struct {
188  u64 snapid;
189  } snap;
190  struct {
191  u64 cookie;
192  u64 ver;
193  __u8 flag;
194  u32 prot_ver;
195  u32 timeout;
196  } watch;
197  };
198  u32 payload_len;
199 };
200 
201 extern int ceph_osdc_init(struct ceph_osd_client *osdc,
202  struct ceph_client *client);
203 extern void ceph_osdc_stop(struct ceph_osd_client *osdc);
204 
205 extern void ceph_osdc_handle_reply(struct ceph_osd_client *osdc,
206  struct ceph_msg *msg);
207 extern void ceph_osdc_handle_map(struct ceph_osd_client *osdc,
208  struct ceph_msg *msg);
209 
210 extern int ceph_calc_raw_layout(struct ceph_osd_client *osdc,
211  struct ceph_file_layout *layout,
212  u64 snapid,
213  u64 off, u64 *plen, u64 *bno,
214  struct ceph_osd_request *req,
215  struct ceph_osd_req_op *op);
216 
217 extern struct ceph_osd_request *ceph_osdc_alloc_request(struct ceph_osd_client *osdc,
218  int flags,
219  struct ceph_snap_context *snapc,
220  struct ceph_osd_req_op *ops,
221  bool use_mempool,
222  gfp_t gfp_flags,
223  struct page **pages,
224  struct bio *bio);
225 
226 extern void ceph_osdc_build_request(struct ceph_osd_request *req,
227  u64 off, u64 *plen,
228  struct ceph_osd_req_op *src_ops,
229  struct ceph_snap_context *snapc,
230  struct timespec *mtime,
231  const char *oid,
232  int oid_len);
233 
234 extern struct ceph_osd_request *ceph_osdc_new_request(struct ceph_osd_client *,
235  struct ceph_file_layout *layout,
236  struct ceph_vino vino,
237  u64 offset, u64 *len, int op, int flags,
238  struct ceph_snap_context *snapc,
239  int do_sync, u32 truncate_seq,
240  u64 truncate_size,
241  struct timespec *mtime,
242  bool use_mempool, int num_reply,
243  int page_align);
244 
245 extern void ceph_osdc_set_request_linger(struct ceph_osd_client *osdc,
246  struct ceph_osd_request *req);
247 extern void ceph_osdc_unregister_linger_request(struct ceph_osd_client *osdc,
248  struct ceph_osd_request *req);
249 
250 static inline void ceph_osdc_get_request(struct ceph_osd_request *req)
251 {
252  kref_get(&req->r_kref);
253 }
254 extern void ceph_osdc_release_request(struct kref *kref);
255 static inline void ceph_osdc_put_request(struct ceph_osd_request *req)
256 {
257  kref_put(&req->r_kref, ceph_osdc_release_request);
258 }
259 
260 extern int ceph_osdc_start_request(struct ceph_osd_client *osdc,
261  struct ceph_osd_request *req,
262  bool nofail);
263 extern int ceph_osdc_wait_request(struct ceph_osd_client *osdc,
264  struct ceph_osd_request *req);
265 extern void ceph_osdc_sync(struct ceph_osd_client *osdc);
266 
267 extern int ceph_osdc_readpages(struct ceph_osd_client *osdc,
268  struct ceph_vino vino,
269  struct ceph_file_layout *layout,
270  u64 off, u64 *plen,
271  u32 truncate_seq, u64 truncate_size,
272  struct page **pages, int nr_pages,
273  int page_align);
274 
275 extern int ceph_osdc_writepages(struct ceph_osd_client *osdc,
276  struct ceph_vino vino,
277  struct ceph_file_layout *layout,
278  struct ceph_snap_context *sc,
279  u64 off, u64 len,
280  u32 truncate_seq, u64 truncate_size,
281  struct timespec *mtime,
282  struct page **pages, int nr_pages,
283  int flags, int do_sync, bool nofail);
284 
285 /* watch/notify events */
286 extern int ceph_osdc_create_event(struct ceph_osd_client *osdc,
287  void (*event_cb)(u64, u64, u8, void *),
288  int one_shot, void *data,
289  struct ceph_osd_event **pevent);
290 extern void ceph_osdc_cancel_event(struct ceph_osd_event *event);
291 extern int ceph_osdc_wait_event(struct ceph_osd_event *event,
292  unsigned long timeout);
293 extern void ceph_osdc_put_event(struct ceph_osd_event *event);
294 #endif
295 
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