d583d1bf6cd9ac74348f4b3977a7e985a7bfdc13
[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 struct ceph_pagelist;
19
20 /*
21  * completion callback for async writepages
22  */
23 typedef void (*ceph_osdc_callback_t)(struct ceph_osd_request *,
24                                      struct ceph_msg *);
25
26 /* a given osd we're communicating with */
27 struct ceph_osd {
28         atomic_t o_ref;
29         struct ceph_osd_client *o_osdc;
30         int o_osd;
31         int o_incarnation;
32         struct rb_node o_node;
33         struct ceph_connection o_con;
34         struct list_head o_requests;
35         struct list_head o_osd_lru;
36         struct ceph_authorizer *o_authorizer;
37         void *o_authorizer_buf, *o_authorizer_reply_buf;
38         size_t o_authorizer_buf_len, o_authorizer_reply_buf_len;
39         unsigned long lru_ttl;
40         int o_marked_for_keepalive;
41         struct list_head o_keepalive_item;
42 };
43
44 /* an in-flight request */
45 struct ceph_osd_request {
46         u64             r_tid;              /* unique for this client */
47         struct rb_node  r_node;
48         struct list_head r_req_lru_item;
49         struct list_head r_osd_item;
50         struct ceph_osd *r_osd;
51         struct ceph_pg   r_pgid;
52         int              r_pg_osds[CEPH_PG_MAX_SIZE];
53         int              r_num_pg_osds;
54
55         struct ceph_connection *r_con_filling_msg;
56
57         struct ceph_msg  *r_request, *r_reply;
58         int               r_result;
59         int               r_flags;     /* any additional flags for the osd */
60         u32               r_sent;      /* >0 if r_request is sending/sent */
61         int               r_got_reply;
62
63         struct ceph_osd_client *r_osdc;
64         struct kref       r_kref;
65         bool              r_mempool;
66         struct completion r_completion, r_safe_completion;
67         ceph_osdc_callback_t r_callback, r_safe_callback;
68         struct ceph_eversion r_reassert_version;
69         struct list_head  r_unsafe_item;
70
71         struct inode *r_inode;                /* for use by callbacks */
72
73         char              r_oid[40];          /* object name */
74         int               r_oid_len;
75         unsigned long     r_stamp;            /* send OR check time */
76         bool              r_resend;           /* msg send failed, needs retry */
77
78         struct ceph_file_layout r_file_layout;
79         struct ceph_snap_context *r_snapc;    /* snap context for writes */
80         unsigned          r_num_pages;        /* size of page array (follows) */
81         struct page     **r_pages;            /* pages for data payload */
82         int               r_pages_from_pool;
83         int               r_own_pages;        /* if true, i own page list */
84 #ifdef CONFIG_BLOCK
85         struct bio       *r_bio;              /* instead of pages */
86 #endif
87
88         struct ceph_pagelist *r_trail;        /* trailing part of the data */
89 };
90
91 struct ceph_osd_client {
92         struct ceph_client     *client;
93
94         struct ceph_osdmap     *osdmap;       /* current map */
95         struct rw_semaphore    map_sem;
96         struct completion      map_waiters;
97         u64                    last_requested_map;
98
99         struct mutex           request_mutex;
100         struct rb_root         osds;          /* osds */
101         struct list_head       osd_lru;       /* idle osds */
102         u64                    timeout_tid;   /* tid of timeout triggering rq */
103         u64                    last_tid;      /* tid of last request */
104         struct rb_root         requests;      /* pending requests */
105         struct list_head       req_lru;       /* pending requests lru */
106         int                    num_requests;
107         struct delayed_work    timeout_work;
108         struct delayed_work    osds_timeout_work;
109 #ifdef CONFIG_DEBUG_FS
110         struct dentry          *debugfs_file;
111 #endif
112
113         mempool_t              *req_mempool;
114
115         struct ceph_msgpool     msgpool_op;
116         struct ceph_msgpool     msgpool_op_reply;
117 };
118
119 struct ceph_osd_req_op {
120         u16 op;           /* CEPH_OSD_OP_* */
121         u32 flags;        /* CEPH_OSD_FLAG_* */
122         union {
123                 struct {
124                         u64 offset, length;
125                         u64 truncate_size;
126                         u32 truncate_seq;
127                 } extent;
128                 struct {
129                         const char *name;
130                         u32 name_len;
131                         const char  *val;
132                         u32 value_len;
133                         __u8 cmp_op;       /* CEPH_OSD_CMPXATTR_OP_* */
134                         __u8 cmp_mode;     /* CEPH_OSD_CMPXATTR_MODE_* */
135                 } xattr;
136                 struct {
137                         __u8 class_len;
138                         __u8 method_len;
139                         __u8 argc;
140                         u32 indata_len;
141                 } cls;
142                 struct {
143                         u64 cookie, count;
144                 } pgls;
145         };
146         u32 payload_len;
147 };
148
149 extern int ceph_osdc_init(struct ceph_osd_client *osdc,
150                           struct ceph_client *client);
151 extern void ceph_osdc_stop(struct ceph_osd_client *osdc);
152
153 extern void ceph_osdc_handle_reply(struct ceph_osd_client *osdc,
154                                    struct ceph_msg *msg);
155 extern void ceph_osdc_handle_map(struct ceph_osd_client *osdc,
156                                  struct ceph_msg *msg);
157
158 extern void ceph_calc_raw_layout(struct ceph_osd_client *osdc,
159                         struct ceph_file_layout *layout,
160                         u64 snapid,
161                         u64 off, u64 *plen, u64 *bno,
162                         struct ceph_osd_request *req,
163                         struct ceph_osd_req_op *op);
164
165 extern struct ceph_osd_request *ceph_osdc_alloc_request(struct ceph_osd_client *osdc,
166                                                int flags,
167                                                struct ceph_snap_context *snapc,
168                                                struct ceph_osd_req_op *ops,
169                                                bool use_mempool,
170                                                gfp_t gfp_flags,
171                                                struct page **pages,
172                                                struct bio *bio);
173
174 extern void ceph_osdc_build_request(struct ceph_osd_request *req,
175                                     u64 off, u64 *plen,
176                                     struct ceph_osd_req_op *src_ops,
177                                     struct ceph_snap_context *snapc,
178                                     struct timespec *mtime,
179                                     const char *oid,
180                                     int oid_len);
181
182 extern struct ceph_osd_request *ceph_osdc_new_request(struct ceph_osd_client *,
183                                       struct ceph_file_layout *layout,
184                                       struct ceph_vino vino,
185                                       u64 offset, u64 *len, int op, int flags,
186                                       struct ceph_snap_context *snapc,
187                                       int do_sync, u32 truncate_seq,
188                                       u64 truncate_size,
189                                       struct timespec *mtime,
190                                       bool use_mempool, int num_reply);
191
192 static inline void ceph_osdc_get_request(struct ceph_osd_request *req)
193 {
194         kref_get(&req->r_kref);
195 }
196 extern void ceph_osdc_release_request(struct kref *kref);
197 static inline void ceph_osdc_put_request(struct ceph_osd_request *req)
198 {
199         kref_put(&req->r_kref, ceph_osdc_release_request);
200 }
201
202 extern int ceph_osdc_start_request(struct ceph_osd_client *osdc,
203                                    struct ceph_osd_request *req,
204                                    bool nofail);
205 extern int ceph_osdc_wait_request(struct ceph_osd_client *osdc,
206                                   struct ceph_osd_request *req);
207 extern void ceph_osdc_sync(struct ceph_osd_client *osdc);
208
209 extern int ceph_osdc_readpages(struct ceph_osd_client *osdc,
210                                struct ceph_vino vino,
211                                struct ceph_file_layout *layout,
212                                u64 off, u64 *plen,
213                                u32 truncate_seq, u64 truncate_size,
214                                struct page **pages, int nr_pages);
215
216 extern int ceph_osdc_writepages(struct ceph_osd_client *osdc,
217                                 struct ceph_vino vino,
218                                 struct ceph_file_layout *layout,
219                                 struct ceph_snap_context *sc,
220                                 u64 off, u64 len,
221                                 u32 truncate_seq, u64 truncate_size,
222                                 struct timespec *mtime,
223                                 struct page **pages, int nr_pages,
224                                 int flags, int do_sync, bool nofail);
225
226 #endif
227