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3d14c5d2 YS |
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> | |
187f1882 | 10 | #include <linux/bug.h> |
3d14c5d2 YS |
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 | ||
497888cf | 39 | #define CEPH_OPT_DEFAULT (0) |
3d14c5d2 YS |
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_timeout; | |
53 | int osd_keepalive_timeout; | |
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; | |
8323c3aa | 65 | struct ceph_crypto_key *key; |
3d14c5d2 YS |
66 | }; |
67 | ||
68 | /* | |
69 | * defaults | |
70 | */ | |
71 | #define CEPH_MOUNT_TIMEOUT_DEFAULT 60 | |
72 | #define CEPH_OSD_TIMEOUT_DEFAULT 60 /* seconds */ | |
73 | #define CEPH_OSD_KEEPALIVE_DEFAULT 5 | |
74 | #define CEPH_OSD_IDLE_TTL_DEFAULT 60 | |
3d14c5d2 YS |
75 | |
76 | #define CEPH_MSG_MAX_FRONT_LEN (16*1024*1024) | |
77 | #define CEPH_MSG_MAX_DATA_LEN (16*1024*1024) | |
78 | ||
79 | #define CEPH_AUTH_NAME_DEFAULT "guest" | |
80 | ||
81 | /* | |
82 | * Delay telling the MDS we no longer want caps, in case we reopen | |
83 | * the file. Delay a minimum amount of time, even if we send a cap | |
84 | * message for some other reason. Otherwise, take the oppotunity to | |
85 | * update the mds to avoid sending another message later. | |
86 | */ | |
87 | #define CEPH_CAPS_WANTED_DELAY_MIN_DEFAULT 5 /* cap release delay */ | |
88 | #define CEPH_CAPS_WANTED_DELAY_MAX_DEFAULT 60 /* cap release delay */ | |
89 | ||
90 | #define CEPH_CAP_RELEASE_SAFETY_DEFAULT (CEPH_CAPS_PER_RELEASE * 4) | |
91 | ||
92 | /* mount state */ | |
93 | enum { | |
94 | CEPH_MOUNT_MOUNTING, | |
95 | CEPH_MOUNT_MOUNTED, | |
96 | CEPH_MOUNT_UNMOUNTING, | |
97 | CEPH_MOUNT_UNMOUNTED, | |
98 | CEPH_MOUNT_SHUTDOWN, | |
99 | }; | |
100 | ||
101 | /* | |
102 | * subtract jiffies | |
103 | */ | |
104 | static inline unsigned long time_sub(unsigned long a, unsigned long b) | |
105 | { | |
106 | BUG_ON(time_after(b, a)); | |
107 | return (long)a - (long)b; | |
108 | } | |
109 | ||
110 | struct ceph_mds_client; | |
111 | ||
112 | /* | |
113 | * per client state | |
114 | * | |
115 | * possibly shared by multiple mount points, if they are | |
116 | * mounting the same ceph filesystem/cluster. | |
117 | */ | |
118 | struct ceph_client { | |
119 | struct ceph_fsid fsid; | |
120 | bool have_fsid; | |
121 | ||
122 | void *private; | |
123 | ||
124 | struct ceph_options *options; | |
125 | ||
126 | struct mutex mount_mutex; /* serialize mount attempts */ | |
127 | wait_queue_head_t auth_wq; | |
128 | int auth_err; | |
129 | ||
130 | int (*extra_mon_dispatch)(struct ceph_client *, struct ceph_msg *); | |
131 | ||
132 | u32 supported_features; | |
133 | u32 required_features; | |
134 | ||
135 | struct ceph_messenger *msgr; /* messenger instance */ | |
136 | struct ceph_mon_client monc; | |
137 | struct ceph_osd_client osdc; | |
138 | ||
139 | #ifdef CONFIG_DEBUG_FS | |
140 | struct dentry *debugfs_dir; | |
141 | struct dentry *debugfs_monmap; | |
142 | struct dentry *debugfs_osdmap; | |
143 | #endif | |
144 | }; | |
145 | ||
146 | ||
147 | ||
148 | /* | |
149 | * snapshots | |
150 | */ | |
151 | ||
152 | /* | |
153 | * A "snap context" is the set of existing snapshots when we | |
154 | * write data. It is used by the OSD to guide its COW behavior. | |
155 | * | |
156 | * The ceph_snap_context is refcounted, and attached to each dirty | |
157 | * page, indicating which context the dirty data belonged when it was | |
158 | * dirtied. | |
159 | */ | |
160 | struct ceph_snap_context { | |
161 | atomic_t nref; | |
162 | u64 seq; | |
163 | int num_snaps; | |
164 | u64 snaps[]; | |
165 | }; | |
166 | ||
167 | static inline struct ceph_snap_context * | |
168 | ceph_get_snap_context(struct ceph_snap_context *sc) | |
169 | { | |
170 | /* | |
171 | printk("get_snap_context %p %d -> %d\n", sc, atomic_read(&sc->nref), | |
172 | atomic_read(&sc->nref)+1); | |
173 | */ | |
174 | if (sc) | |
175 | atomic_inc(&sc->nref); | |
176 | return sc; | |
177 | } | |
178 | ||
179 | static inline void ceph_put_snap_context(struct ceph_snap_context *sc) | |
180 | { | |
181 | if (!sc) | |
182 | return; | |
183 | /* | |
184 | printk("put_snap_context %p %d -> %d\n", sc, atomic_read(&sc->nref), | |
185 | atomic_read(&sc->nref)-1); | |
186 | */ | |
187 | if (atomic_dec_and_test(&sc->nref)) { | |
188 | /*printk(" deleting snap_context %p\n", sc);*/ | |
189 | kfree(sc); | |
190 | } | |
191 | } | |
192 | ||
193 | /* | |
194 | * calculate the number of pages a given length and offset map onto, | |
195 | * if we align the data. | |
196 | */ | |
197 | static inline int calc_pages_for(u64 off, u64 len) | |
198 | { | |
199 | return ((off+len+PAGE_CACHE_SIZE-1) >> PAGE_CACHE_SHIFT) - | |
200 | (off >> PAGE_CACHE_SHIFT); | |
201 | } | |
202 | ||
203 | /* ceph_common.c */ | |
204 | extern const char *ceph_msg_type_name(int type); | |
205 | extern int ceph_check_fsid(struct ceph_client *client, struct ceph_fsid *fsid); | |
206 | extern struct kmem_cache *ceph_inode_cachep; | |
207 | extern struct kmem_cache *ceph_cap_cachep; | |
208 | extern struct kmem_cache *ceph_dentry_cachep; | |
209 | extern struct kmem_cache *ceph_file_cachep; | |
210 | ||
ee57741c | 211 | extern struct ceph_options *ceph_parse_options(char *options, |
3d14c5d2 YS |
212 | const char *dev_name, const char *dev_name_end, |
213 | int (*parse_extra_token)(char *c, void *private), | |
214 | void *private); | |
215 | extern void ceph_destroy_options(struct ceph_options *opt); | |
216 | extern int ceph_compare_options(struct ceph_options *new_opt, | |
217 | struct ceph_client *client); | |
218 | extern struct ceph_client *ceph_create_client(struct ceph_options *opt, | |
6ab00d46 SW |
219 | void *private, |
220 | unsigned supported_features, | |
221 | unsigned required_features); | |
3d14c5d2 YS |
222 | extern u64 ceph_client_id(struct ceph_client *client); |
223 | extern void ceph_destroy_client(struct ceph_client *client); | |
224 | extern int __ceph_open_session(struct ceph_client *client, | |
225 | unsigned long started); | |
226 | extern int ceph_open_session(struct ceph_client *client); | |
227 | ||
228 | /* pagevec.c */ | |
229 | extern void ceph_release_page_vector(struct page **pages, int num_pages); | |
230 | ||
231 | extern struct page **ceph_get_direct_page_vector(const char __user *data, | |
b6aa5901 HC |
232 | int num_pages, |
233 | bool write_page); | |
234 | extern void ceph_put_page_vector(struct page **pages, int num_pages, | |
235 | bool dirty); | |
3d14c5d2 YS |
236 | extern void ceph_release_page_vector(struct page **pages, int num_pages); |
237 | extern struct page **ceph_alloc_page_vector(int num_pages, gfp_t flags); | |
238 | extern int ceph_copy_user_to_page_vector(struct page **pages, | |
239 | const char __user *data, | |
240 | loff_t off, size_t len); | |
241 | extern int ceph_copy_to_page_vector(struct page **pages, | |
242 | const char *data, | |
243 | loff_t off, size_t len); | |
244 | extern int ceph_copy_from_page_vector(struct page **pages, | |
245 | char *data, | |
246 | loff_t off, size_t len); | |
247 | extern int ceph_copy_page_vector_to_user(struct page **pages, char __user *data, | |
248 | loff_t off, size_t len); | |
249 | extern void ceph_zero_page_vector_range(int off, int len, struct page **pages); | |
250 | ||
251 | ||
252 | #endif /* _FS_CEPH_SUPER_H */ |