Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/sage/ceph...
[linux-2.6.git] / fs / 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 "types.h"
10 #include "osdmap.h"
11 #include "messenger.h"
12
13 struct ceph_msg;
14 struct ceph_snap_context;
15 struct ceph_osd_request;
16 struct ceph_osd_client;
17 struct ceph_authorizer;
18
19 /*
20  * completion callback for async writepages
21  */
22 typedef void (*ceph_osdc_callback_t)(struct ceph_osd_request *,
23                                      struct ceph_msg *);
24
25 /* a given osd we're communicating with */
26 struct 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 */
44 struct 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
52         struct ceph_connection *r_con_filling_msg;
53
54         struct ceph_msg  *r_request, *r_reply;
55         int               r_result;
56         int               r_flags;     /* any additional flags for the osd */
57         u32               r_sent;      /* >0 if r_request is sending/sent */
58         int               r_got_reply;
59
60         struct ceph_osd_client *r_osdc;
61         struct kref       r_kref;
62         bool              r_mempool;
63         struct completion r_completion, r_safe_completion;
64         ceph_osdc_callback_t r_callback, r_safe_callback;
65         struct ceph_eversion r_reassert_version;
66         struct list_head  r_unsafe_item;
67
68         struct inode *r_inode;                /* for use by callbacks */
69         struct writeback_control *r_wbc;      /* ditto */
70
71         char              r_oid[40];          /* object name */
72         int               r_oid_len;
73         unsigned long     r_stamp;            /* send OR check time */
74         bool              r_resend;           /* msg send failed, needs retry */
75
76         struct ceph_file_layout r_file_layout;
77         struct ceph_snap_context *r_snapc;    /* snap context for writes */
78         unsigned          r_num_pages;        /* size of page array (follows) */
79         struct page     **r_pages;            /* pages for data payload */
80         int               r_pages_from_pool;
81         int               r_own_pages;        /* if true, i own page list */
82 };
83
84 struct ceph_osd_client {
85         struct ceph_client     *client;
86
87         struct ceph_osdmap     *osdmap;       /* current map */
88         struct rw_semaphore    map_sem;
89         struct completion      map_waiters;
90         u64                    last_requested_map;
91
92         struct mutex           request_mutex;
93         struct rb_root         osds;          /* osds */
94         struct list_head       osd_lru;       /* idle osds */
95         u64                    timeout_tid;   /* tid of timeout triggering rq */
96         u64                    last_tid;      /* tid of last request */
97         struct rb_root         requests;      /* pending requests */
98         struct list_head       req_lru;       /* pending requests lru */
99         int                    num_requests;
100         struct delayed_work    timeout_work;
101         struct delayed_work    osds_timeout_work;
102 #ifdef CONFIG_DEBUG_FS
103         struct dentry          *debugfs_file;
104 #endif
105
106         mempool_t              *req_mempool;
107
108         struct ceph_msgpool     msgpool_op;
109         struct ceph_msgpool     msgpool_op_reply;
110 };
111
112 extern int ceph_osdc_init(struct ceph_osd_client *osdc,
113                           struct ceph_client *client);
114 extern void ceph_osdc_stop(struct ceph_osd_client *osdc);
115
116 extern void ceph_osdc_handle_reply(struct ceph_osd_client *osdc,
117                                    struct ceph_msg *msg);
118 extern void ceph_osdc_handle_map(struct ceph_osd_client *osdc,
119                                  struct ceph_msg *msg);
120
121 extern struct ceph_osd_request *ceph_osdc_new_request(struct ceph_osd_client *,
122                                       struct ceph_file_layout *layout,
123                                       struct ceph_vino vino,
124                                       u64 offset, u64 *len, int op, int flags,
125                                       struct ceph_snap_context *snapc,
126                                       int do_sync, u32 truncate_seq,
127                                       u64 truncate_size,
128                                       struct timespec *mtime,
129                                       bool use_mempool, int num_reply);
130
131 static inline void ceph_osdc_get_request(struct ceph_osd_request *req)
132 {
133         kref_get(&req->r_kref);
134 }
135 extern void ceph_osdc_release_request(struct kref *kref);
136 static inline void ceph_osdc_put_request(struct ceph_osd_request *req)
137 {
138         kref_put(&req->r_kref, ceph_osdc_release_request);
139 }
140
141 extern int ceph_osdc_start_request(struct ceph_osd_client *osdc,
142                                    struct ceph_osd_request *req,
143                                    bool nofail);
144 extern int ceph_osdc_wait_request(struct ceph_osd_client *osdc,
145                                   struct ceph_osd_request *req);
146 extern void ceph_osdc_sync(struct ceph_osd_client *osdc);
147
148 extern int ceph_osdc_readpages(struct ceph_osd_client *osdc,
149                                struct ceph_vino vino,
150                                struct ceph_file_layout *layout,
151                                u64 off, u64 *plen,
152                                u32 truncate_seq, u64 truncate_size,
153                                struct page **pages, int nr_pages);
154
155 extern int ceph_osdc_writepages(struct ceph_osd_client *osdc,
156                                 struct ceph_vino vino,
157                                 struct ceph_file_layout *layout,
158                                 struct ceph_snap_context *sc,
159                                 u64 off, u64 len,
160                                 u32 truncate_seq, u64 truncate_size,
161                                 struct timespec *mtime,
162                                 struct page **pages, int nr_pages,
163                                 int flags, int do_sync, bool nofail);
164
165 #endif
166