1 #ifndef _FS_CEPH_LIBCEPH_H
2 #define _FS_CEPH_LIBCEPH_H
4 #include <linux/ceph/ceph_debug.h>
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>
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>
18 #include <linux/ceph/types.h>
19 #include <linux/ceph/messenger.h>
20 #include <linux/ceph/msgpool.h>
21 #include <linux/ceph/mon_client.h>
22 #include <linux/ceph/osd_client.h>
23 #include <linux/ceph/ceph_fs.h>
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 */
33 #define CEPH_OPT_DEFAULT (0)
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))
42 struct ceph_fsid fsid
;
43 struct ceph_entity_addr my_addr
;
46 int osd_keepalive_timeout
;
49 * any type that can't be simply compared or doesn't need need
50 * to be compared should go beyond this point,
51 * ceph_compare_options() should be updated accordingly
54 struct ceph_entity_addr
*mon_addr
; /* should be the first
55 pointer type of args */
58 struct ceph_crypto_key
*key
;
64 #define CEPH_MOUNT_TIMEOUT_DEFAULT 60
65 #define CEPH_OSD_KEEPALIVE_DEFAULT 5
66 #define CEPH_OSD_IDLE_TTL_DEFAULT 60
68 #define CEPH_MSG_MAX_FRONT_LEN (16*1024*1024)
69 #define CEPH_MSG_MAX_DATA_LEN (16*1024*1024)
71 #define CEPH_AUTH_NAME_DEFAULT "guest"
74 * Delay telling the MDS we no longer want caps, in case we reopen
75 * the file. Delay a minimum amount of time, even if we send a cap
76 * message for some other reason. Otherwise, take the oppotunity to
77 * update the mds to avoid sending another message later.
79 #define CEPH_CAPS_WANTED_DELAY_MIN_DEFAULT 5 /* cap release delay */
80 #define CEPH_CAPS_WANTED_DELAY_MAX_DEFAULT 60 /* cap release delay */
82 #define CEPH_CAP_RELEASE_SAFETY_DEFAULT (CEPH_CAPS_PER_RELEASE * 4)
88 CEPH_MOUNT_UNMOUNTING
,
96 static inline unsigned long time_sub(unsigned long a
, unsigned long b
)
98 BUG_ON(time_after(b
, a
));
99 return (long)a
- (long)b
;
102 struct ceph_mds_client
;
107 * possibly shared by multiple mount points, if they are
108 * mounting the same ceph filesystem/cluster.
111 struct ceph_fsid fsid
;
116 struct ceph_options
*options
;
118 struct mutex mount_mutex
; /* serialize mount attempts */
119 wait_queue_head_t auth_wq
;
122 int (*extra_mon_dispatch
)(struct ceph_client
*, struct ceph_msg
*);
124 u32 supported_features
;
125 u32 required_features
;
127 struct ceph_messenger msgr
; /* messenger instance */
128 struct ceph_mon_client monc
;
129 struct ceph_osd_client osdc
;
131 #ifdef CONFIG_DEBUG_FS
132 struct dentry
*debugfs_dir
;
133 struct dentry
*debugfs_monmap
;
134 struct dentry
*debugfs_osdmap
;
145 * A "snap context" is the set of existing snapshots when we
146 * write data. It is used by the OSD to guide its COW behavior.
148 * The ceph_snap_context is refcounted, and attached to each dirty
149 * page, indicating which context the dirty data belonged when it was
152 struct ceph_snap_context
{
159 static inline struct ceph_snap_context
*
160 ceph_get_snap_context(struct ceph_snap_context
*sc
)
163 printk("get_snap_context %p %d -> %d\n", sc, atomic_read(&sc->nref),
164 atomic_read(&sc->nref)+1);
167 atomic_inc(&sc
->nref
);
171 static inline void ceph_put_snap_context(struct ceph_snap_context
*sc
)
176 printk("put_snap_context %p %d -> %d\n", sc, atomic_read(&sc->nref),
177 atomic_read(&sc->nref)-1);
179 if (atomic_dec_and_test(&sc
->nref
)) {
180 /*printk(" deleting snap_context %p\n", sc);*/
186 * calculate the number of pages a given length and offset map onto,
187 * if we align the data.
189 static inline int calc_pages_for(u64 off
, u64 len
)
191 return ((off
+len
+PAGE_CACHE_SIZE
-1) >> PAGE_CACHE_SHIFT
) -
192 (off
>> PAGE_CACHE_SHIFT
);
196 extern const char *ceph_msg_type_name(int type
);
197 extern int ceph_check_fsid(struct ceph_client
*client
, struct ceph_fsid
*fsid
);
198 extern struct kmem_cache
*ceph_inode_cachep
;
199 extern struct kmem_cache
*ceph_cap_cachep
;
200 extern struct kmem_cache
*ceph_dentry_cachep
;
201 extern struct kmem_cache
*ceph_file_cachep
;
203 extern struct ceph_options
*ceph_parse_options(char *options
,
204 const char *dev_name
, const char *dev_name_end
,
205 int (*parse_extra_token
)(char *c
, void *private),
207 extern void ceph_destroy_options(struct ceph_options
*opt
);
208 extern int ceph_compare_options(struct ceph_options
*new_opt
,
209 struct ceph_client
*client
);
210 extern struct ceph_client
*ceph_create_client(struct ceph_options
*opt
,
212 unsigned supported_features
,
213 unsigned required_features
);
214 extern u64
ceph_client_id(struct ceph_client
*client
);
215 extern void ceph_destroy_client(struct ceph_client
*client
);
216 extern int __ceph_open_session(struct ceph_client
*client
,
217 unsigned long started
);
218 extern int ceph_open_session(struct ceph_client
*client
);
221 extern void ceph_release_page_vector(struct page
**pages
, int num_pages
);
223 extern struct page
**ceph_get_direct_page_vector(const char __user
*data
,
226 extern void ceph_put_page_vector(struct page
**pages
, int num_pages
,
228 extern void ceph_release_page_vector(struct page
**pages
, int num_pages
);
229 extern struct page
**ceph_alloc_page_vector(int num_pages
, gfp_t flags
);
230 extern int ceph_copy_user_to_page_vector(struct page
**pages
,
231 const char __user
*data
,
232 loff_t off
, size_t len
);
233 extern int ceph_copy_to_page_vector(struct page
**pages
,
235 loff_t off
, size_t len
);
236 extern int ceph_copy_from_page_vector(struct page
**pages
,
238 loff_t off
, size_t len
);
239 extern int ceph_copy_page_vector_to_user(struct page
**pages
, char __user
*data
,
240 loff_t off
, size_t len
);
241 extern void ceph_zero_page_vector_range(int off
, int len
, struct page
**pages
);
244 #endif /* _FS_CEPH_SUPER_H */