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 * Supported features
27 */
28 #define CEPH_FEATURE_SUPPORTED_DEFAULT CEPH_FEATURE_NOSRCADDR
29 #define CEPH_FEATURE_REQUIRED_DEFAULT CEPH_FEATURE_NOSRCADDR
30
31 /*
32 * mount options
33 */
34 #define CEPH_OPT_FSID (1<<0)
35 #define CEPH_OPT_NOSHARE (1<<1) /* don't share client with other sbs */
36 #define CEPH_OPT_MYIP (1<<2) /* specified my ip */
37 #define CEPH_OPT_NOCRC (1<<3) /* no data crc on writes */
38
39 #define CEPH_OPT_DEFAULT (0)
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 int mount_timeout;
51 int osd_idle_ttl;
52 int osd_keepalive_timeout;
53
54 /*
55 * any type that can't be simply compared or doesn't need need
56 * to be compared should go beyond this point,
57 * ceph_compare_options() should be updated accordingly
58 */
59
60 struct ceph_entity_addr *mon_addr; /* should be the first
61 pointer type of args */
62 int num_mon;
63 char *name;
64 struct ceph_crypto_key *key;
65 };
66
67 /*
68 * defaults
69 */
70 #define CEPH_MOUNT_TIMEOUT_DEFAULT 60
71 #define CEPH_OSD_KEEPALIVE_DEFAULT 5
72 #define CEPH_OSD_IDLE_TTL_DEFAULT 60
73
74 #define CEPH_MSG_MAX_FRONT_LEN (16*1024*1024)
75 #define CEPH_MSG_MAX_DATA_LEN (16*1024*1024)
76
77 #define CEPH_AUTH_NAME_DEFAULT "guest"
78
79 /*
80 * Delay telling the MDS we no longer want caps, in case we reopen
81 * the file. Delay a minimum amount of time, even if we send a cap
82 * message for some other reason. Otherwise, take the oppotunity to
83 * update the mds to avoid sending another message later.
84 */
85 #define CEPH_CAPS_WANTED_DELAY_MIN_DEFAULT 5 /* cap release delay */
86 #define CEPH_CAPS_WANTED_DELAY_MAX_DEFAULT 60 /* cap release delay */
87
88 #define CEPH_CAP_RELEASE_SAFETY_DEFAULT (CEPH_CAPS_PER_RELEASE * 4)
89
90 /* mount state */
91 enum {
92 CEPH_MOUNT_MOUNTING,
93 CEPH_MOUNT_MOUNTED,
94 CEPH_MOUNT_UNMOUNTING,
95 CEPH_MOUNT_UNMOUNTED,
96 CEPH_MOUNT_SHUTDOWN,
97 };
98
99 /*
100 * subtract jiffies
101 */
time_sub(unsigned long a,unsigned long b)102 static inline unsigned long time_sub(unsigned long a, unsigned long b)
103 {
104 BUG_ON(time_after(b, a));
105 return (long)a - (long)b;
106 }
107
108 struct ceph_mds_client;
109
110 /*
111 * per client state
112 *
113 * possibly shared by multiple mount points, if they are
114 * mounting the same ceph filesystem/cluster.
115 */
116 struct ceph_client {
117 struct ceph_fsid fsid;
118 bool have_fsid;
119
120 void *private;
121
122 struct ceph_options *options;
123
124 struct mutex mount_mutex; /* serialize mount attempts */
125 wait_queue_head_t auth_wq;
126 int auth_err;
127
128 int (*extra_mon_dispatch)(struct ceph_client *, struct ceph_msg *);
129
130 u32 supported_features;
131 u32 required_features;
132
133 struct ceph_messenger msgr; /* messenger instance */
134 struct ceph_mon_client monc;
135 struct ceph_osd_client osdc;
136
137 #ifdef CONFIG_DEBUG_FS
138 struct dentry *debugfs_dir;
139 struct dentry *debugfs_monmap;
140 struct dentry *debugfs_osdmap;
141 #endif
142 };
143
144
145
146 /*
147 * snapshots
148 */
149
150 /*
151 * A "snap context" is the set of existing snapshots when we
152 * write data. It is used by the OSD to guide its COW behavior.
153 *
154 * The ceph_snap_context is refcounted, and attached to each dirty
155 * page, indicating which context the dirty data belonged when it was
156 * dirtied.
157 */
158 struct ceph_snap_context {
159 atomic_t nref;
160 u64 seq;
161 int num_snaps;
162 u64 snaps[];
163 };
164
165 static inline struct ceph_snap_context *
ceph_get_snap_context(struct ceph_snap_context * sc)166 ceph_get_snap_context(struct ceph_snap_context *sc)
167 {
168 /*
169 printk("get_snap_context %p %d -> %d\n", sc, atomic_read(&sc->nref),
170 atomic_read(&sc->nref)+1);
171 */
172 if (sc)
173 atomic_inc(&sc->nref);
174 return sc;
175 }
176
ceph_put_snap_context(struct ceph_snap_context * sc)177 static inline void ceph_put_snap_context(struct ceph_snap_context *sc)
178 {
179 if (!sc)
180 return;
181 /*
182 printk("put_snap_context %p %d -> %d\n", sc, atomic_read(&sc->nref),
183 atomic_read(&sc->nref)-1);
184 */
185 if (atomic_dec_and_test(&sc->nref)) {
186 /*printk(" deleting snap_context %p\n", sc);*/
187 kfree(sc);
188 }
189 }
190
191 /*
192 * calculate the number of pages a given length and offset map onto,
193 * if we align the data.
194 */
calc_pages_for(u64 off,u64 len)195 static inline int calc_pages_for(u64 off, u64 len)
196 {
197 return ((off+len+PAGE_CACHE_SIZE-1) >> PAGE_CACHE_SHIFT) -
198 (off >> PAGE_CACHE_SHIFT);
199 }
200
201 /* ceph_common.c */
202 extern const char *ceph_msg_type_name(int type);
203 extern int ceph_check_fsid(struct ceph_client *client, struct ceph_fsid *fsid);
204 extern struct kmem_cache *ceph_inode_cachep;
205 extern struct kmem_cache *ceph_cap_cachep;
206 extern struct kmem_cache *ceph_dentry_cachep;
207 extern struct kmem_cache *ceph_file_cachep;
208
209 extern struct ceph_options *ceph_parse_options(char *options,
210 const char *dev_name, const char *dev_name_end,
211 int (*parse_extra_token)(char *c, void *private),
212 void *private);
213 extern void ceph_destroy_options(struct ceph_options *opt);
214 extern int ceph_compare_options(struct ceph_options *new_opt,
215 struct ceph_client *client);
216 extern struct ceph_client *ceph_create_client(struct ceph_options *opt,
217 void *private,
218 unsigned supported_features,
219 unsigned required_features);
220 extern u64 ceph_client_id(struct ceph_client *client);
221 extern void ceph_destroy_client(struct ceph_client *client);
222 extern int __ceph_open_session(struct ceph_client *client,
223 unsigned long started);
224 extern int ceph_open_session(struct ceph_client *client);
225
226 /* pagevec.c */
227 extern void ceph_release_page_vector(struct page **pages, int num_pages);
228
229 extern struct page **ceph_get_direct_page_vector(const char __user *data,
230 int num_pages,
231 bool write_page);
232 extern void ceph_put_page_vector(struct page **pages, int num_pages,
233 bool dirty);
234 extern void ceph_release_page_vector(struct page **pages, int num_pages);
235 extern struct page **ceph_alloc_page_vector(int num_pages, gfp_t flags);
236 extern int ceph_copy_user_to_page_vector(struct page **pages,
237 const char __user *data,
238 loff_t off, size_t len);
239 extern int ceph_copy_to_page_vector(struct page **pages,
240 const char *data,
241 loff_t off, size_t len);
242 extern int ceph_copy_from_page_vector(struct page **pages,
243 char *data,
244 loff_t off, size_t len);
245 extern int ceph_copy_page_vector_to_user(struct page **pages, char __user *data,
246 loff_t off, size_t len);
247 extern void ceph_zero_page_vector_range(int off, int len, struct page **pages);
248
249
250 #endif /* _FS_CEPH_SUPER_H */
251