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
;
47 int osd_keepalive_timeout
;
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
55 struct ceph_entity_addr
*mon_addr
; /* should be the first
56 pointer type of args */
59 struct ceph_crypto_key
*key
;
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
70 #define CEPH_MSG_MAX_FRONT_LEN (16*1024*1024)
71 #define CEPH_MSG_MAX_DATA_LEN (16*1024*1024)
73 #define CEPH_AUTH_NAME_DEFAULT "guest"
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.
81 #define CEPH_CAPS_WANTED_DELAY_MIN_DEFAULT 5 /* cap release delay */
82 #define CEPH_CAPS_WANTED_DELAY_MAX_DEFAULT 60 /* cap release delay */
84 #define CEPH_CAP_RELEASE_SAFETY_DEFAULT (CEPH_CAPS_PER_RELEASE * 4)
90 CEPH_MOUNT_UNMOUNTING
,
98 static inline unsigned long time_sub(unsigned long a
, unsigned long b
)
100 BUG_ON(time_after(b
, a
));
101 return (long)a
- (long)b
;
104 struct ceph_mds_client
;
109 * possibly shared by multiple mount points, if they are
110 * mounting the same ceph filesystem/cluster.
113 struct ceph_fsid fsid
;
118 struct ceph_options
*options
;
120 struct mutex mount_mutex
; /* serialize mount attempts */
121 wait_queue_head_t auth_wq
;
124 int (*extra_mon_dispatch
)(struct ceph_client
*, struct ceph_msg
*);
126 u32 supported_features
;
127 u32 required_features
;
129 struct ceph_messenger msgr
; /* messenger instance */
130 struct ceph_mon_client monc
;
131 struct ceph_osd_client osdc
;
133 #ifdef CONFIG_DEBUG_FS
134 struct dentry
*debugfs_dir
;
135 struct dentry
*debugfs_monmap
;
136 struct dentry
*debugfs_osdmap
;
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.
150 * The ceph_snap_context is refcounted, and attached to each dirty
151 * page, indicating which context the dirty data belonged when it was
154 struct ceph_snap_context
{
161 static inline struct ceph_snap_context
*
162 ceph_get_snap_context(struct ceph_snap_context
*sc
)
165 printk("get_snap_context %p %d -> %d\n", sc, atomic_read(&sc->nref),
166 atomic_read(&sc->nref)+1);
169 atomic_inc(&sc
->nref
);
173 static inline void ceph_put_snap_context(struct ceph_snap_context
*sc
)
178 printk("put_snap_context %p %d -> %d\n", sc, atomic_read(&sc->nref),
179 atomic_read(&sc->nref)-1);
181 if (atomic_dec_and_test(&sc
->nref
)) {
182 /*printk(" deleting snap_context %p\n", sc);*/
188 * calculate the number of pages a given length and offset map onto,
189 * if we align the data.
191 static inline int calc_pages_for(u64 off
, u64 len
)
193 return ((off
+len
+PAGE_CACHE_SIZE
-1) >> PAGE_CACHE_SHIFT
) -
194 (off
>> PAGE_CACHE_SHIFT
);
198 extern const char *ceph_msg_type_name(int type
);
199 extern int ceph_check_fsid(struct ceph_client
*client
, struct ceph_fsid
*fsid
);
200 extern struct kmem_cache
*ceph_inode_cachep
;
201 extern struct kmem_cache
*ceph_cap_cachep
;
202 extern struct kmem_cache
*ceph_dentry_cachep
;
203 extern struct kmem_cache
*ceph_file_cachep
;
205 extern 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),
209 extern void ceph_destroy_options(struct ceph_options
*opt
);
210 extern int ceph_compare_options(struct ceph_options
*new_opt
,
211 struct ceph_client
*client
);
212 extern struct ceph_client
*ceph_create_client(struct ceph_options
*opt
,
214 unsigned supported_features
,
215 unsigned required_features
);
216 extern u64
ceph_client_id(struct ceph_client
*client
);
217 extern void ceph_destroy_client(struct ceph_client
*client
);
218 extern int __ceph_open_session(struct ceph_client
*client
,
219 unsigned long started
);
220 extern int ceph_open_session(struct ceph_client
*client
);
223 extern void ceph_release_page_vector(struct page
**pages
, int num_pages
);
225 extern struct page
**ceph_get_direct_page_vector(const char __user
*data
,
228 extern void ceph_put_page_vector(struct page
**pages
, int num_pages
,
230 extern void ceph_release_page_vector(struct page
**pages
, int num_pages
);
231 extern struct page
**ceph_alloc_page_vector(int num_pages
, gfp_t flags
);
232 extern int ceph_copy_user_to_page_vector(struct page
**pages
,
233 const char __user
*data
,
234 loff_t off
, size_t len
);
235 extern int ceph_copy_to_page_vector(struct page
**pages
,
237 loff_t off
, size_t len
);
238 extern int ceph_copy_from_page_vector(struct page
**pages
,
240 loff_t off
, size_t len
);
241 extern int ceph_copy_page_vector_to_user(struct page
**pages
, char __user
*data
,
242 loff_t off
, size_t len
);
243 extern void ceph_zero_page_vector_range(int off
, int len
, struct page
**pages
);
246 #endif /* _FS_CEPH_SUPER_H */