Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
tjh.dev
kernel
os
linux
1#ifndef _FS_CEPH_LIBCEPH_H
2#define _FS_CEPH_LIBCEPH_H
3
4#include "ceph_debug.h"
5
6#include <asm/unaligned.h>
7#include <linux/backing-dev.h>
8#include <linux/completion.h>
9#include <linux/exportfs.h>
10#include <linux/bug.h>
11#include <linux/fs.h>
12#include <linux/mempool.h>
13#include <linux/pagemap.h>
14#include <linux/wait.h>
15#include <linux/writeback.h>
16#include <linux/slab.h>
17
18#include "types.h"
19#include "messenger.h"
20#include "msgpool.h"
21#include "mon_client.h"
22#include "osd_client.h"
23#include "ceph_fs.h"
24
25/*
26 * mount options
27 */
28#define CEPH_OPT_FSID (1<<0)
29#define CEPH_OPT_NOSHARE (1<<1) /* don't share client with other sbs */
30#define CEPH_OPT_MYIP (1<<2) /* specified my ip */
31#define CEPH_OPT_NOCRC (1<<3) /* no data crc on writes */
32
33#define CEPH_OPT_DEFAULT (0)
34
35#define ceph_set_opt(client, opt) \
36 (client)->options->flags |= CEPH_OPT_##opt;
37#define ceph_test_opt(client, opt) \
38 (!!((client)->options->flags & CEPH_OPT_##opt))
39
40struct ceph_options {
41 int flags;
42 struct ceph_fsid fsid;
43 struct ceph_entity_addr my_addr;
44 int mount_timeout;
45 int osd_idle_ttl;
46 int osd_timeout;
47 int osd_keepalive_timeout;
48
49 /*
50 * any type that can't be simply compared or doesn't need need
51 * to be compared should go beyond this point,
52 * ceph_compare_options() should be updated accordingly
53 */
54
55 struct ceph_entity_addr *mon_addr; /* should be the first
56 pointer type of args */
57 int num_mon;
58 char *name;
59 struct ceph_crypto_key *key;
60};
61
62/*
63 * defaults
64 */
65#define CEPH_MOUNT_TIMEOUT_DEFAULT 60
66#define CEPH_OSD_TIMEOUT_DEFAULT 60 /* seconds */
67#define CEPH_OSD_KEEPALIVE_DEFAULT 5
68#define CEPH_OSD_IDLE_TTL_DEFAULT 60
69
70#define CEPH_MSG_MAX_FRONT_LEN (16*1024*1024)
71#define CEPH_MSG_MAX_DATA_LEN (16*1024*1024)
72
73#define CEPH_AUTH_NAME_DEFAULT "guest"
74
75/*
76 * Delay telling the MDS we no longer want caps, in case we reopen
77 * the file. Delay a minimum amount of time, even if we send a cap
78 * message for some other reason. Otherwise, take the oppotunity to
79 * update the mds to avoid sending another message later.
80 */
81#define CEPH_CAPS_WANTED_DELAY_MIN_DEFAULT 5 /* cap release delay */
82#define CEPH_CAPS_WANTED_DELAY_MAX_DEFAULT 60 /* cap release delay */
83
84#define CEPH_CAP_RELEASE_SAFETY_DEFAULT (CEPH_CAPS_PER_RELEASE * 4)
85
86/* mount state */
87enum {
88 CEPH_MOUNT_MOUNTING,
89 CEPH_MOUNT_MOUNTED,
90 CEPH_MOUNT_UNMOUNTING,
91 CEPH_MOUNT_UNMOUNTED,
92 CEPH_MOUNT_SHUTDOWN,
93};
94
95/*
96 * subtract jiffies
97 */
98static inline unsigned long time_sub(unsigned long a, unsigned long b)
99{
100 BUG_ON(time_after(b, a));
101 return (long)a - (long)b;
102}
103
104struct ceph_mds_client;
105
106/*
107 * per client state
108 *
109 * possibly shared by multiple mount points, if they are
110 * mounting the same ceph filesystem/cluster.
111 */
112struct ceph_client {
113 struct ceph_fsid fsid;
114 bool have_fsid;
115
116 void *private;
117
118 struct ceph_options *options;
119
120 struct mutex mount_mutex; /* serialize mount attempts */
121 wait_queue_head_t auth_wq;
122 int auth_err;
123
124 int (*extra_mon_dispatch)(struct ceph_client *, struct ceph_msg *);
125
126 u32 supported_features;
127 u32 required_features;
128
129 struct ceph_messenger msgr; /* messenger instance */
130 struct ceph_mon_client monc;
131 struct ceph_osd_client osdc;
132
133#ifdef CONFIG_DEBUG_FS
134 struct dentry *debugfs_dir;
135 struct dentry *debugfs_monmap;
136 struct dentry *debugfs_osdmap;
137#endif
138};
139
140
141
142/*
143 * snapshots
144 */
145
146/*
147 * A "snap context" is the set of existing snapshots when we
148 * write data. It is used by the OSD to guide its COW behavior.
149 *
150 * The ceph_snap_context is refcounted, and attached to each dirty
151 * page, indicating which context the dirty data belonged when it was
152 * dirtied.
153 */
154struct ceph_snap_context {
155 atomic_t nref;
156 u64 seq;
157 u32 num_snaps;
158 u64 snaps[];
159};
160
161static inline struct ceph_snap_context *
162ceph_get_snap_context(struct ceph_snap_context *sc)
163{
164 /*
165 printk("get_snap_context %p %d -> %d\n", sc, atomic_read(&sc->nref),
166 atomic_read(&sc->nref)+1);
167 */
168 if (sc)
169 atomic_inc(&sc->nref);
170 return sc;
171}
172
173static inline void ceph_put_snap_context(struct ceph_snap_context *sc)
174{
175 if (!sc)
176 return;
177 /*
178 printk("put_snap_context %p %d -> %d\n", sc, atomic_read(&sc->nref),
179 atomic_read(&sc->nref)-1);
180 */
181 if (atomic_dec_and_test(&sc->nref)) {
182 /*printk(" deleting snap_context %p\n", sc);*/
183 kfree(sc);
184 }
185}
186
187/*
188 * calculate the number of pages a given length and offset map onto,
189 * if we align the data.
190 */
191static inline int calc_pages_for(u64 off, u64 len)
192{
193 return ((off+len+PAGE_CACHE_SIZE-1) >> PAGE_CACHE_SHIFT) -
194 (off >> PAGE_CACHE_SHIFT);
195}
196
197/* ceph_common.c */
198extern const char *ceph_msg_type_name(int type);
199extern int ceph_check_fsid(struct ceph_client *client, struct ceph_fsid *fsid);
200extern struct kmem_cache *ceph_inode_cachep;
201extern struct kmem_cache *ceph_cap_cachep;
202extern struct kmem_cache *ceph_dentry_cachep;
203extern struct kmem_cache *ceph_file_cachep;
204
205extern struct ceph_options *ceph_parse_options(char *options,
206 const char *dev_name, const char *dev_name_end,
207 int (*parse_extra_token)(char *c, void *private),
208 void *private);
209extern void ceph_destroy_options(struct ceph_options *opt);
210extern int ceph_compare_options(struct ceph_options *new_opt,
211 struct ceph_client *client);
212extern struct ceph_client *ceph_create_client(struct ceph_options *opt,
213 void *private,
214 unsigned supported_features,
215 unsigned required_features);
216extern u64 ceph_client_id(struct ceph_client *client);
217extern void ceph_destroy_client(struct ceph_client *client);
218extern int __ceph_open_session(struct ceph_client *client,
219 unsigned long started);
220extern int ceph_open_session(struct ceph_client *client);
221
222/* pagevec.c */
223extern void ceph_release_page_vector(struct page **pages, int num_pages);
224
225extern struct page **ceph_get_direct_page_vector(const char __user *data,
226 int num_pages,
227 bool write_page);
228extern void ceph_put_page_vector(struct page **pages, int num_pages,
229 bool dirty);
230extern void ceph_release_page_vector(struct page **pages, int num_pages);
231extern struct page **ceph_alloc_page_vector(int num_pages, gfp_t flags);
232extern int ceph_copy_user_to_page_vector(struct page **pages,
233 const char __user *data,
234 loff_t off, size_t len);
235extern int ceph_copy_to_page_vector(struct page **pages,
236 const char *data,
237 loff_t off, size_t len);
238extern int ceph_copy_from_page_vector(struct page **pages,
239 char *data,
240 loff_t off, size_t len);
241extern int ceph_copy_page_vector_to_user(struct page **pages, char __user *data,
242 loff_t off, size_t len);
243extern void ceph_zero_page_vector_range(int off, int len, struct page **pages);
244
245
246#endif /* _FS_CEPH_SUPER_H */