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authorSage Weil <sage@newdream.net>2009-10-06 14:31:10 -0400
committerSage Weil <sage@newdream.net>2009-10-06 14:31:10 -0400
commitf24e9980eb860d8600cbe5ef3d2fd9295320d229 (patch)
tree10f43450ad2cd4d799dd02d33c02d4ed8bef39d6 /fs/ceph/osd_client.h
parent2f2dc053404febedc9c273452d9d518fb31fde72 (diff)
ceph: OSD client
The OSD client is responsible for reading and writing data from/to the object storage pool. This includes determining where objects are stored in the cluster, and ensuring that requests are retried or redirected in the event of a node failure or data migration. If an OSD does not respond before a timeout expires, keepalive messages are sent across the lossless, ordered communications channel to ensure that any break in the TCP is discovered. If the session does reset, a reconnection is attempted and affected requests are resent (by the message transport layer). Signed-off-by: Sage Weil <sage@newdream.net>
Diffstat (limited to 'fs/ceph/osd_client.h')
-rw-r--r--fs/ceph/osd_client.h144
1 files changed, 144 insertions, 0 deletions
diff --git a/fs/ceph/osd_client.h b/fs/ceph/osd_client.h
new file mode 100644
index 000000000000..9a4addf7d651
--- /dev/null
+++ b/fs/ceph/osd_client.h
@@ -0,0 +1,144 @@
1#ifndef _FS_CEPH_OSD_CLIENT_H
2#define _FS_CEPH_OSD_CLIENT_H
3
4#include <linux/completion.h>
5#include <linux/mempool.h>
6#include <linux/rbtree.h>
7
8#include "types.h"
9#include "osdmap.h"
10#include "messenger.h"
11
12struct ceph_msg;
13struct ceph_snap_context;
14struct ceph_osd_request;
15struct ceph_osd_client;
16
17/*
18 * completion callback for async writepages
19 */
20typedef void (*ceph_osdc_callback_t)(struct ceph_osd_request *,
21 struct ceph_msg *);
22
23/* a given osd we're communicating with */
24struct ceph_osd {
25 atomic_t o_ref;
26 struct ceph_osd_client *o_osdc;
27 int o_osd;
28 int o_incarnation;
29 struct rb_node o_node;
30 struct ceph_connection o_con;
31 struct list_head o_requests;
32};
33
34/* an in-flight request */
35struct ceph_osd_request {
36 u64 r_tid; /* unique for this client */
37 struct rb_node r_node;
38 struct list_head r_osd_item;
39 struct ceph_osd *r_osd;
40
41 struct ceph_msg *r_request, *r_reply;
42 int r_result;
43 int r_flags; /* any additional flags for the osd */
44 u32 r_sent; /* >0 if r_request is sending/sent */
45 int r_prepared_pages, r_got_reply;
46
47 struct ceph_osd_client *r_osdc;
48 atomic_t r_ref;
49 bool r_mempool;
50 struct completion r_completion, r_safe_completion;
51 ceph_osdc_callback_t r_callback, r_safe_callback;
52 struct ceph_eversion r_reassert_version;
53 struct list_head r_unsafe_item;
54
55 struct inode *r_inode; /* for use by callbacks */
56 struct writeback_control *r_wbc; /* ditto */
57
58 char r_oid[40]; /* object name */
59 int r_oid_len;
60 unsigned long r_timeout_stamp;
61 bool r_resend; /* msg send failed, needs retry */
62
63 struct ceph_file_layout r_file_layout;
64 struct ceph_snap_context *r_snapc; /* snap context for writes */
65 unsigned r_num_pages; /* size of page array (follows) */
66 struct page **r_pages; /* pages for data payload */
67 int r_pages_from_pool;
68 int r_own_pages; /* if true, i own page list */
69};
70
71struct ceph_osd_client {
72 struct ceph_client *client;
73
74 struct ceph_osdmap *osdmap; /* current map */
75 struct rw_semaphore map_sem;
76 struct completion map_waiters;
77 u64 last_requested_map;
78
79 struct mutex request_mutex;
80 struct rb_root osds; /* osds */
81 u64 timeout_tid; /* tid of timeout triggering rq */
82 u64 last_tid; /* tid of last request */
83 struct rb_root requests; /* pending requests */
84 int num_requests;
85 struct delayed_work timeout_work;
86 struct dentry *debugfs_file;
87
88 mempool_t *req_mempool;
89
90 struct ceph_msgpool msgpool_op;
91 struct ceph_msgpool msgpool_op_reply;
92};
93
94extern int ceph_osdc_init(struct ceph_osd_client *osdc,
95 struct ceph_client *client);
96extern void ceph_osdc_stop(struct ceph_osd_client *osdc);
97
98extern void ceph_osdc_handle_reply(struct ceph_osd_client *osdc,
99 struct ceph_msg *msg);
100extern void ceph_osdc_handle_map(struct ceph_osd_client *osdc,
101 struct ceph_msg *msg);
102
103extern struct ceph_osd_request *ceph_osdc_new_request(struct ceph_osd_client *,
104 struct ceph_file_layout *layout,
105 struct ceph_vino vino,
106 u64 offset, u64 *len, int op, int flags,
107 struct ceph_snap_context *snapc,
108 int do_sync, u32 truncate_seq,
109 u64 truncate_size,
110 struct timespec *mtime,
111 bool use_mempool, int num_reply);
112
113static inline void ceph_osdc_get_request(struct ceph_osd_request *req)
114{
115 atomic_inc(&req->r_ref);
116}
117extern void ceph_osdc_put_request(struct ceph_osd_request *req);
118
119extern int ceph_osdc_start_request(struct ceph_osd_client *osdc,
120 struct ceph_osd_request *req,
121 bool nofail);
122extern int ceph_osdc_wait_request(struct ceph_osd_client *osdc,
123 struct ceph_osd_request *req);
124extern void ceph_osdc_sync(struct ceph_osd_client *osdc);
125
126extern int ceph_osdc_readpages(struct ceph_osd_client *osdc,
127 struct ceph_vino vino,
128 struct ceph_file_layout *layout,
129 u64 off, u64 *plen,
130 u32 truncate_seq, u64 truncate_size,
131 struct page **pages, int nr_pages);
132
133extern int ceph_osdc_writepages(struct ceph_osd_client *osdc,
134 struct ceph_vino vino,
135 struct ceph_file_layout *layout,
136 struct ceph_snap_context *sc,
137 u64 off, u64 len,
138 u32 truncate_seq, u64 truncate_size,
139 struct timespec *mtime,
140 struct page **pages, int nr_pages,
141 int flags, int do_sync, bool nofail);
142
143#endif
144
generated by cgit v1.2.2 (git 2.25.0) at 2025-01-24 07:41:35 -0500