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
13struct ceph_msg;
14struct ceph_snap_context;
15struct ceph_osd_request;
16struct ceph_osd_client;
17struct ceph_authorizer;
18
19/*
20 * completion callback for async writepages
21 */
22typedef void (*ceph_osdc_callback_t)(struct ceph_osd_request *,
23				     struct ceph_msg *);
24
25/* a given osd we're communicating with */
26struct ceph_osd {
27	atomic_t o_ref;
28	struct ceph_osd_client *o_osdc;
29	int o_osd;
30	int o_incarnation;
31	struct rb_node o_node;
32	struct ceph_connection o_con;
33	struct list_head o_requests;
34	struct list_head o_osd_lru;
35	struct ceph_authorizer *o_authorizer;
36	void *o_authorizer_buf, *o_authorizer_reply_buf;
37	size_t o_authorizer_buf_len, o_authorizer_reply_buf_len;
38	unsigned long lru_ttl;
39	int o_marked_for_keepalive;
40	struct list_head o_keepalive_item;
41};
42
43/* an in-flight request */
44struct ceph_osd_request {
45	u64             r_tid;              /* unique for this client */
46	struct rb_node  r_node;
47	struct list_head r_req_lru_item;
48	struct list_head r_osd_item;
49	struct ceph_osd *r_osd;
50	struct ceph_pg   r_pgid;
51	int              r_pg_osds[CEPH_PG_MAX_SIZE];
52	int              r_num_pg_osds;
53
54	struct ceph_connection *r_con_filling_msg;
55
56	struct ceph_msg  *r_request, *r_reply;
57	int               r_result;
58	int               r_flags;     /* any additional flags for the osd */
59	u32               r_sent;      /* >0 if r_request is sending/sent */
60	int               r_got_reply;
61
62	struct ceph_osd_client *r_osdc;
63	struct kref       r_kref;
64	bool              r_mempool;
65	struct completion r_completion, r_safe_completion;
66	ceph_osdc_callback_t r_callback, r_safe_callback;
67	struct ceph_eversion r_reassert_version;
68	struct list_head  r_unsafe_item;
69
70	struct inode *r_inode;         	      /* for use by callbacks */
71
72	char              r_oid[40];          /* object name */
73	int               r_oid_len;
74	unsigned long     r_stamp;            /* send OR check time */
75	bool              r_resend;           /* msg send failed, needs retry */
76
77	struct ceph_file_layout r_file_layout;
78	struct ceph_snap_context *r_snapc;    /* snap context for writes */
79	unsigned          r_num_pages;        /* size of page array (follows) */
80	struct page     **r_pages;            /* pages for data payload */
81	int               r_pages_from_pool;
82	int               r_own_pages;        /* if true, i own page list */
83};
84
85struct ceph_osd_client {
86	struct ceph_client     *client;
87
88	struct ceph_osdmap     *osdmap;       /* current map */
89	struct rw_semaphore    map_sem;
90	struct completion      map_waiters;
91	u64                    last_requested_map;
92
93	struct mutex           request_mutex;
94	struct rb_root         osds;          /* osds */
95	struct list_head       osd_lru;       /* idle osds */
96	u64                    timeout_tid;   /* tid of timeout triggering rq */
97	u64                    last_tid;      /* tid of last request */
98	struct rb_root         requests;      /* pending requests */
99	struct list_head       req_lru;	      /* pending requests lru */
100	int                    num_requests;
101	struct delayed_work    timeout_work;
102	struct delayed_work    osds_timeout_work;
103#ifdef CONFIG_DEBUG_FS
104	struct dentry 	       *debugfs_file;
105#endif
106
107	mempool_t              *req_mempool;
108
109	struct ceph_msgpool	msgpool_op;
110	struct ceph_msgpool	msgpool_op_reply;
111};
112
113extern int ceph_osdc_init(struct ceph_osd_client *osdc,
114			  struct ceph_client *client);
115extern void ceph_osdc_stop(struct ceph_osd_client *osdc);
116
117extern void ceph_osdc_handle_reply(struct ceph_osd_client *osdc,
118				   struct ceph_msg *msg);
119extern void ceph_osdc_handle_map(struct ceph_osd_client *osdc,
120				 struct ceph_msg *msg);
121
122extern struct ceph_osd_request *ceph_osdc_new_request(struct ceph_osd_client *,
123				      struct ceph_file_layout *layout,
124				      struct ceph_vino vino,
125				      u64 offset, u64 *len, int op, int flags,
126				      struct ceph_snap_context *snapc,
127				      int do_sync, u32 truncate_seq,
128				      u64 truncate_size,
129				      struct timespec *mtime,
130				      bool use_mempool, int num_reply);
131
132static inline void ceph_osdc_get_request(struct ceph_osd_request *req)
133{
134	kref_get(&req->r_kref);
135}
136extern void ceph_osdc_release_request(struct kref *kref);
137static inline void ceph_osdc_put_request(struct ceph_osd_request *req)
138{
139	kref_put(&req->r_kref, ceph_osdc_release_request);
140}
141
142extern int ceph_osdc_start_request(struct ceph_osd_client *osdc,
143				   struct ceph_osd_request *req,
144				   bool nofail);
145extern int ceph_osdc_wait_request(struct ceph_osd_client *osdc,
146				  struct ceph_osd_request *req);
147extern void ceph_osdc_sync(struct ceph_osd_client *osdc);
148
149extern int ceph_osdc_readpages(struct ceph_osd_client *osdc,
150			       struct ceph_vino vino,
151			       struct ceph_file_layout *layout,
152			       u64 off, u64 *plen,
153			       u32 truncate_seq, u64 truncate_size,
154			       struct page **pages, int nr_pages);
155
156extern int ceph_osdc_writepages(struct ceph_osd_client *osdc,
157				struct ceph_vino vino,
158				struct ceph_file_layout *layout,
159				struct ceph_snap_context *sc,
160				u64 off, u64 len,
161				u32 truncate_seq, u64 truncate_size,
162				struct timespec *mtime,
163				struct page **pages, int nr_pages,
164				int flags, int do_sync, bool nofail);
165
166#endif
167