Merge branch 'for_linus' of git://cavan.codon.org.uk/platform-drivers-x86
[firefly-linux-kernel-4.4.55.git] / 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