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ceph: keep reserved replies on the request structure
[karo-tx-linux.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 ceph_authorizer *o_authorizer;
35         void *o_authorizer_buf, *o_authorizer_reply_buf;
36         size_t o_authorizer_buf_len, o_authorizer_reply_buf_len;
37 };
38
39 /* an in-flight request */
40 struct ceph_osd_request {
41         u64             r_tid;              /* unique for this client */
42         struct rb_node  r_node;
43         struct list_head r_osd_item;
44         struct ceph_osd *r_osd;
45         struct ceph_pg   r_pgid;
46
47         struct ceph_connection *r_con_filling_msg;
48
49         struct ceph_msg  *r_request, *r_reply;
50         int               r_result;
51         int               r_flags;     /* any additional flags for the osd */
52         u32               r_sent;      /* >0 if r_request is sending/sent */
53         int               r_got_reply;
54         int               r_num_prealloc_reply;
55
56         struct ceph_osd_client *r_osdc;
57         struct kref       r_kref;
58         bool              r_mempool;
59         struct completion r_completion, r_safe_completion;
60         ceph_osdc_callback_t r_callback, r_safe_callback;
61         struct ceph_eversion r_reassert_version;
62         struct list_head  r_unsafe_item;
63
64         struct inode *r_inode;                /* for use by callbacks */
65         struct writeback_control *r_wbc;      /* ditto */
66
67         char              r_oid[40];          /* object name */
68         int               r_oid_len;
69         unsigned long     r_timeout_stamp;
70         bool              r_resend;           /* msg send failed, needs retry */
71
72         struct ceph_file_layout r_file_layout;
73         struct ceph_snap_context *r_snapc;    /* snap context for writes */
74         unsigned          r_num_pages;        /* size of page array (follows) */
75         struct page     **r_pages;            /* pages for data payload */
76         int               r_pages_from_pool;
77         int               r_own_pages;        /* if true, i own page list */
78
79         struct ceph_msg   *replies[2];
80         int               cur_reply;
81 };
82
83 struct ceph_osd_client {
84         struct ceph_client     *client;
85
86         struct ceph_osdmap     *osdmap;       /* current map */
87         struct rw_semaphore    map_sem;
88         struct completion      map_waiters;
89         u64                    last_requested_map;
90
91         struct mutex           request_mutex;
92         struct rb_root         osds;          /* osds */
93         u64                    timeout_tid;   /* tid of timeout triggering rq */
94         u64                    last_tid;      /* tid of last request */
95         struct rb_root         requests;      /* pending requests */
96         int                    num_requests;
97         struct delayed_work    timeout_work;
98 #ifdef CONFIG_DEBUG_FS
99         struct dentry          *debugfs_file;
100 #endif
101
102         mempool_t              *req_mempool;
103
104         struct ceph_msgpool     msgpool_op;
105 };
106
107 extern int ceph_osdc_init(struct ceph_osd_client *osdc,
108                           struct ceph_client *client);
109 extern void ceph_osdc_stop(struct ceph_osd_client *osdc);
110
111 extern void ceph_osdc_handle_reply(struct ceph_osd_client *osdc,
112                                    struct ceph_msg *msg);
113 extern void ceph_osdc_handle_map(struct ceph_osd_client *osdc,
114                                  struct ceph_msg *msg);
115
116 extern struct ceph_osd_request *ceph_osdc_new_request(struct ceph_osd_client *,
117                                       struct ceph_file_layout *layout,
118                                       struct ceph_vino vino,
119                                       u64 offset, u64 *len, int op, int flags,
120                                       struct ceph_snap_context *snapc,
121                                       int do_sync, u32 truncate_seq,
122                                       u64 truncate_size,
123                                       struct timespec *mtime,
124                                       bool use_mempool, int num_reply);
125
126 static inline void ceph_osdc_get_request(struct ceph_osd_request *req)
127 {
128         kref_get(&req->r_kref);
129 }
130 extern void ceph_osdc_release_request(struct kref *kref);
131 static inline void ceph_osdc_put_request(struct ceph_osd_request *req)
132 {
133         kref_put(&req->r_kref, ceph_osdc_release_request);
134 }
135
136 extern int ceph_osdc_start_request(struct ceph_osd_client *osdc,
137                                    struct ceph_osd_request *req,
138                                    bool nofail);
139 extern int ceph_osdc_wait_request(struct ceph_osd_client *osdc,
140                                   struct ceph_osd_request *req);
141 extern void ceph_osdc_sync(struct ceph_osd_client *osdc);
142
143 extern int ceph_osdc_readpages(struct ceph_osd_client *osdc,
144                                struct ceph_vino vino,
145                                struct ceph_file_layout *layout,
146                                u64 off, u64 *plen,
147                                u32 truncate_seq, u64 truncate_size,
148                                struct page **pages, int nr_pages);
149
150 extern int ceph_osdc_writepages(struct ceph_osd_client *osdc,
151                                 struct ceph_vino vino,
152                                 struct ceph_file_layout *layout,
153                                 struct ceph_snap_context *sc,
154                                 u64 off, u64 len,
155                                 u32 truncate_seq, u64 truncate_size,
156                                 struct timespec *mtime,
157                                 struct page **pages, int nr_pages,
158                                 int flags, int do_sync, bool nofail);
159
160 #endif
161