1 /* SPDX-License-Identifier: GPL-2.0 */
2 #ifndef _FS_CEPH_LIBCEPH_H
3 #define _FS_CEPH_LIBCEPH_H
4
5 #include <linux/ceph/ceph_debug.h>
6
7 #include <asm/unaligned.h>
8 #include <linux/backing-dev.h>
9 #include <linux/completion.h>
10 #include <linux/exportfs.h>
11 #include <linux/bug.h>
12 #include <linux/fs.h>
13 #include <linux/mempool.h>
14 #include <linux/pagemap.h>
15 #include <linux/wait.h>
16 #include <linux/writeback.h>
17 #include <linux/slab.h>
18 #include <linux/refcount.h>
19
20 #include <linux/ceph/types.h>
21 #include <linux/ceph/messenger.h>
22 #include <linux/ceph/msgpool.h>
23 #include <linux/ceph/mon_client.h>
24 #include <linux/ceph/osd_client.h>
25 #include <linux/ceph/ceph_fs.h>
26 #include <linux/ceph/string_table.h>
27
28 /*
29 * mount options
30 */
31 #define CEPH_OPT_FSID (1<<0)
32 #define CEPH_OPT_NOSHARE (1<<1) /* don't share client with other sbs */
33 #define CEPH_OPT_MYIP (1<<2) /* specified my ip */
34 #define CEPH_OPT_NOCRC (1<<3) /* no data crc on writes */
35 #define CEPH_OPT_NOMSGAUTH (1<<4) /* don't require msg signing feat */
36 #define CEPH_OPT_TCP_NODELAY (1<<5) /* TCP_NODELAY on TCP sockets */
37 #define CEPH_OPT_NOMSGSIGN (1<<6) /* don't sign msgs */
38
39 #define CEPH_OPT_DEFAULT (CEPH_OPT_TCP_NODELAY)
40
41 #define ceph_set_opt(client, opt) \
42 (client)->options->flags |= CEPH_OPT_##opt;
43 #define ceph_test_opt(client, opt) \
44 (!!((client)->options->flags & CEPH_OPT_##opt))
45
46 struct ceph_options {
47 int flags;
48 struct ceph_fsid fsid;
49 struct ceph_entity_addr my_addr;
50 unsigned long mount_timeout; /* jiffies */
51 unsigned long osd_idle_ttl; /* jiffies */
52 unsigned long osd_keepalive_timeout; /* jiffies */
53 unsigned long osd_request_timeout; /* jiffies */
54
55 /*
56 * any type that can't be simply compared or doesn't need need
57 * to be compared should go beyond this point,
58 * ceph_compare_options() should be updated accordingly
59 */
60
61 struct ceph_entity_addr *mon_addr; /* should be the first
62 pointer type of args */
63 int num_mon;
64 char *name;
65 struct ceph_crypto_key *key;
66 };
67
68 /*
69 * defaults
70 */
71 #define CEPH_MOUNT_TIMEOUT_DEFAULT msecs_to_jiffies(60 * 1000)
72 #define CEPH_OSD_KEEPALIVE_DEFAULT msecs_to_jiffies(5 * 1000)
73 #define CEPH_OSD_IDLE_TTL_DEFAULT msecs_to_jiffies(60 * 1000)
74 #define CEPH_OSD_REQUEST_TIMEOUT_DEFAULT 0 /* no timeout */
75
76 #define CEPH_MONC_HUNT_INTERVAL msecs_to_jiffies(3 * 1000)
77 #define CEPH_MONC_PING_INTERVAL msecs_to_jiffies(10 * 1000)
78 #define CEPH_MONC_PING_TIMEOUT msecs_to_jiffies(30 * 1000)
79 #define CEPH_MONC_HUNT_BACKOFF 2
80 #define CEPH_MONC_HUNT_MAX_MULT 10
81
82 #define CEPH_MSG_MAX_FRONT_LEN (16*1024*1024)
83 #define CEPH_MSG_MAX_MIDDLE_LEN (16*1024*1024)
84 #define CEPH_MSG_MAX_DATA_LEN (16*1024*1024)
85
86 #define CEPH_AUTH_NAME_DEFAULT "guest"
87
88 /* mount state */
89 enum {
90 CEPH_MOUNT_MOUNTING,
91 CEPH_MOUNT_MOUNTED,
92 CEPH_MOUNT_UNMOUNTING,
93 CEPH_MOUNT_UNMOUNTED,
94 CEPH_MOUNT_SHUTDOWN,
95 };
96
ceph_timeout_jiffies(unsigned long timeout)97 static inline unsigned long ceph_timeout_jiffies(unsigned long timeout)
98 {
99 return timeout ?: MAX_SCHEDULE_TIMEOUT;
100 }
101
102 struct ceph_mds_client;
103
104 /*
105 * per client state
106 *
107 * possibly shared by multiple mount points, if they are
108 * mounting the same ceph filesystem/cluster.
109 */
110 struct ceph_client {
111 struct ceph_fsid fsid;
112 bool have_fsid;
113
114 void *private;
115
116 struct ceph_options *options;
117
118 struct mutex mount_mutex; /* serialize mount attempts */
119 wait_queue_head_t auth_wq;
120 int auth_err;
121
122 int (*extra_mon_dispatch)(struct ceph_client *, struct ceph_msg *);
123
124 u64 supported_features;
125 u64 required_features;
126
127 struct ceph_messenger msgr; /* messenger instance */
128 struct ceph_mon_client monc;
129 struct ceph_osd_client osdc;
130
131 #ifdef CONFIG_DEBUG_FS
132 struct dentry *debugfs_dir;
133 struct dentry *debugfs_monmap;
134 struct dentry *debugfs_osdmap;
135 struct dentry *debugfs_options;
136 #endif
137 };
138
139 #define from_msgr(ms) container_of(ms, struct ceph_client, msgr)
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 */
154 struct ceph_snap_context {
155 refcount_t nref;
156 u64 seq;
157 u32 num_snaps;
158 u64 snaps[];
159 };
160
161 extern struct ceph_snap_context *ceph_create_snap_context(u32 snap_count,
162 gfp_t gfp_flags);
163 extern struct ceph_snap_context *ceph_get_snap_context(
164 struct ceph_snap_context *sc);
165 extern void ceph_put_snap_context(struct ceph_snap_context *sc);
166
167 /*
168 * calculate the number of pages a given length and offset map onto,
169 * if we align the data.
170 */
calc_pages_for(u64 off,u64 len)171 static inline int calc_pages_for(u64 off, u64 len)
172 {
173 return ((off+len+PAGE_SIZE-1) >> PAGE_SHIFT) -
174 (off >> PAGE_SHIFT);
175 }
176
177 #define RB_BYVAL(a) (a)
178 #define RB_BYPTR(a) (&(a))
179 #define RB_CMP3WAY(a, b) ((a) < (b) ? -1 : (a) > (b))
180
181 #define DEFINE_RB_INSDEL_FUNCS2(name, type, keyfld, cmpexp, keyexp, nodefld) \
182 static void insert_##name(struct rb_root *root, type *t) \
183 { \
184 struct rb_node **n = &root->rb_node; \
185 struct rb_node *parent = NULL; \
186 \
187 BUG_ON(!RB_EMPTY_NODE(&t->nodefld)); \
188 \
189 while (*n) { \
190 type *cur = rb_entry(*n, type, nodefld); \
191 int cmp; \
192 \
193 parent = *n; \
194 cmp = cmpexp(keyexp(t->keyfld), keyexp(cur->keyfld)); \
195 if (cmp < 0) \
196 n = &(*n)->rb_left; \
197 else if (cmp > 0) \
198 n = &(*n)->rb_right; \
199 else \
200 BUG(); \
201 } \
202 \
203 rb_link_node(&t->nodefld, parent, n); \
204 rb_insert_color(&t->nodefld, root); \
205 } \
206 static void erase_##name(struct rb_root *root, type *t) \
207 { \
208 BUG_ON(RB_EMPTY_NODE(&t->nodefld)); \
209 rb_erase(&t->nodefld, root); \
210 RB_CLEAR_NODE(&t->nodefld); \
211 }
212
213 /*
214 * @lookup_param_type is a parameter and not constructed from (@type,
215 * @keyfld) with typeof() because adding const is too unwieldy.
216 */
217 #define DEFINE_RB_LOOKUP_FUNC2(name, type, keyfld, cmpexp, keyexp, \
218 lookup_param_type, nodefld) \
219 static type *lookup_##name(struct rb_root *root, lookup_param_type key) \
220 { \
221 struct rb_node *n = root->rb_node; \
222 \
223 while (n) { \
224 type *cur = rb_entry(n, type, nodefld); \
225 int cmp; \
226 \
227 cmp = cmpexp(key, keyexp(cur->keyfld)); \
228 if (cmp < 0) \
229 n = n->rb_left; \
230 else if (cmp > 0) \
231 n = n->rb_right; \
232 else \
233 return cur; \
234 } \
235 \
236 return NULL; \
237 }
238
239 #define DEFINE_RB_FUNCS2(name, type, keyfld, cmpexp, keyexp, \
240 lookup_param_type, nodefld) \
241 DEFINE_RB_INSDEL_FUNCS2(name, type, keyfld, cmpexp, keyexp, nodefld) \
242 DEFINE_RB_LOOKUP_FUNC2(name, type, keyfld, cmpexp, keyexp, \
243 lookup_param_type, nodefld)
244
245 /*
246 * Shorthands for integer keys.
247 */
248 #define DEFINE_RB_INSDEL_FUNCS(name, type, keyfld, nodefld) \
249 DEFINE_RB_INSDEL_FUNCS2(name, type, keyfld, RB_CMP3WAY, RB_BYVAL, nodefld)
250
251 #define DEFINE_RB_LOOKUP_FUNC(name, type, keyfld, nodefld) \
252 extern type __lookup_##name##_key; \
253 DEFINE_RB_LOOKUP_FUNC2(name, type, keyfld, RB_CMP3WAY, RB_BYVAL, \
254 typeof(__lookup_##name##_key.keyfld), nodefld)
255
256 #define DEFINE_RB_FUNCS(name, type, keyfld, nodefld) \
257 DEFINE_RB_INSDEL_FUNCS(name, type, keyfld, nodefld) \
258 DEFINE_RB_LOOKUP_FUNC(name, type, keyfld, nodefld)
259
260 extern struct kmem_cache *ceph_inode_cachep;
261 extern struct kmem_cache *ceph_cap_cachep;
262 extern struct kmem_cache *ceph_cap_flush_cachep;
263 extern struct kmem_cache *ceph_dentry_cachep;
264 extern struct kmem_cache *ceph_file_cachep;
265 extern struct kmem_cache *ceph_dir_file_cachep;
266
267 /* ceph_common.c */
268 extern bool libceph_compatible(void *data);
269
270 extern const char *ceph_msg_type_name(int type);
271 extern int ceph_check_fsid(struct ceph_client *client, struct ceph_fsid *fsid);
272 extern void *ceph_kvmalloc(size_t size, gfp_t flags);
273
274 extern struct ceph_options *ceph_parse_options(char *options,
275 const char *dev_name, const char *dev_name_end,
276 int (*parse_extra_token)(char *c, void *private),
277 void *private);
278 int ceph_print_client_options(struct seq_file *m, struct ceph_client *client);
279 extern void ceph_destroy_options(struct ceph_options *opt);
280 extern int ceph_compare_options(struct ceph_options *new_opt,
281 struct ceph_client *client);
282 struct ceph_client *ceph_create_client(struct ceph_options *opt, void *private);
283 struct ceph_entity_addr *ceph_client_addr(struct ceph_client *client);
284 u64 ceph_client_gid(struct ceph_client *client);
285 extern void ceph_destroy_client(struct ceph_client *client);
286 extern int __ceph_open_session(struct ceph_client *client,
287 unsigned long started);
288 extern int ceph_open_session(struct ceph_client *client);
289
290 /* pagevec.c */
291 extern void ceph_release_page_vector(struct page **pages, int num_pages);
292
293 extern struct page **ceph_get_direct_page_vector(const void __user *data,
294 int num_pages,
295 bool write_page);
296 extern void ceph_put_page_vector(struct page **pages, int num_pages,
297 bool dirty);
298 extern struct page **ceph_alloc_page_vector(int num_pages, gfp_t flags);
299 extern int ceph_copy_user_to_page_vector(struct page **pages,
300 const void __user *data,
301 loff_t off, size_t len);
302 extern void ceph_copy_to_page_vector(struct page **pages,
303 const void *data,
304 loff_t off, size_t len);
305 extern void ceph_copy_from_page_vector(struct page **pages,
306 void *data,
307 loff_t off, size_t len);
308 extern void ceph_zero_page_vector_range(int off, int len, struct page **pages);
309
310
311 #endif /* _FS_CEPH_SUPER_H */
312
