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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 | ||
3d14c5d2 YS |
25 | /* |
26 | * mount options | |
27 | */ | |
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 */ | |
32 | ||
497888cf | 33 | #define CEPH_OPT_DEFAULT (0) |
3d14c5d2 YS |
34 | |
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)) | |
39 | ||
40 | struct ceph_options { | |
41 | int flags; | |
42 | struct ceph_fsid fsid; | |
43 | struct ceph_entity_addr my_addr; | |
44 | int mount_timeout; | |
45 | int osd_idle_ttl; | |
46 | int osd_timeout; | |
47 | int osd_keepalive_timeout; | |
48 | ||
49 | /* | |
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 | |
53 | */ | |
54 | ||
55 | struct ceph_entity_addr *mon_addr; /* should be the first | |
56 | pointer type of args */ | |
57 | int num_mon; | |
58 | char *name; | |
8323c3aa | 59 | struct ceph_crypto_key *key; |
3d14c5d2 YS |
60 | }; |
61 | ||
62 | /* | |
63 | * defaults | |
64 | */ | |
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 | |
3d14c5d2 YS |
69 | |
70 | #define CEPH_MSG_MAX_FRONT_LEN (16*1024*1024) | |
71 | #define CEPH_MSG_MAX_DATA_LEN (16*1024*1024) | |
72 | ||
73 | #define CEPH_AUTH_NAME_DEFAULT "guest" | |
74 | ||
75 | /* | |
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. | |
80 | */ | |
81 | #define CEPH_CAPS_WANTED_DELAY_MIN_DEFAULT 5 /* cap release delay */ | |
82 | #define CEPH_CAPS_WANTED_DELAY_MAX_DEFAULT 60 /* cap release delay */ | |
83 | ||
84 | #define CEPH_CAP_RELEASE_SAFETY_DEFAULT (CEPH_CAPS_PER_RELEASE * 4) | |
85 | ||
86 | /* mount state */ | |
87 | enum { | |
88 | CEPH_MOUNT_MOUNTING, | |
89 | CEPH_MOUNT_MOUNTED, | |
90 | CEPH_MOUNT_UNMOUNTING, | |
91 | CEPH_MOUNT_UNMOUNTED, | |
92 | CEPH_MOUNT_SHUTDOWN, | |
93 | }; | |
94 | ||
95 | /* | |
96 | * subtract jiffies | |
97 | */ | |
98 | static inline unsigned long time_sub(unsigned long a, unsigned long b) | |
99 | { | |
100 | BUG_ON(time_after(b, a)); | |
101 | return (long)a - (long)b; | |
102 | } | |
103 | ||
104 | struct ceph_mds_client; | |
105 | ||
106 | /* | |
107 | * per client state | |
108 | * | |
109 | * possibly shared by multiple mount points, if they are | |
110 | * mounting the same ceph filesystem/cluster. | |
111 | */ | |
112 | struct ceph_client { | |
113 | struct ceph_fsid fsid; | |
114 | bool have_fsid; | |
115 | ||
116 | void *private; | |
117 | ||
118 | struct ceph_options *options; | |
119 | ||
120 | struct mutex mount_mutex; /* serialize mount attempts */ | |
121 | wait_queue_head_t auth_wq; | |
122 | int auth_err; | |
123 | ||
124 | int (*extra_mon_dispatch)(struct ceph_client *, struct ceph_msg *); | |
125 | ||
126 | u32 supported_features; | |
127 | u32 required_features; | |
128 | ||
15d9882c | 129 | struct ceph_messenger msgr; /* messenger instance */ |
3d14c5d2 YS |
130 | struct ceph_mon_client monc; |
131 | struct ceph_osd_client osdc; | |
132 | ||
133 | #ifdef CONFIG_DEBUG_FS | |
134 | struct dentry *debugfs_dir; | |
135 | struct dentry *debugfs_monmap; | |
136 | struct dentry *debugfs_osdmap; | |
137 | #endif | |
138 | }; | |
139 | ||
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 | atomic_t nref; | |
156 | u64 seq; | |
aa711ee3 | 157 | u32 num_snaps; |
3d14c5d2 YS |
158 | u64 snaps[]; |
159 | }; | |
160 | ||
161 | static inline struct ceph_snap_context * | |
162 | ceph_get_snap_context(struct ceph_snap_context *sc) | |
163 | { | |
164 | /* | |
165 | printk("get_snap_context %p %d -> %d\n", sc, atomic_read(&sc->nref), | |
166 | atomic_read(&sc->nref)+1); | |
167 | */ | |
168 | if (sc) | |
169 | atomic_inc(&sc->nref); | |
170 | return sc; | |
171 | } | |
172 | ||
173 | static inline void ceph_put_snap_context(struct ceph_snap_context *sc) | |
174 | { | |
175 | if (!sc) | |
176 | return; | |
177 | /* | |
178 | printk("put_snap_context %p %d -> %d\n", sc, atomic_read(&sc->nref), | |
179 | atomic_read(&sc->nref)-1); | |
180 | */ | |
181 | if (atomic_dec_and_test(&sc->nref)) { | |
182 | /*printk(" deleting snap_context %p\n", sc);*/ | |
183 | kfree(sc); | |
184 | } | |
185 | } | |
186 | ||
187 | /* | |
188 | * calculate the number of pages a given length and offset map onto, | |
189 | * if we align the data. | |
190 | */ | |
191 | static inline int calc_pages_for(u64 off, u64 len) | |
192 | { | |
193 | return ((off+len+PAGE_CACHE_SIZE-1) >> PAGE_CACHE_SHIFT) - | |
194 | (off >> PAGE_CACHE_SHIFT); | |
195 | } | |
196 | ||
197 | /* ceph_common.c */ | |
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; | |
204 | ||
ee57741c | 205 | extern struct ceph_options *ceph_parse_options(char *options, |
3d14c5d2 YS |
206 | const char *dev_name, const char *dev_name_end, |
207 | int (*parse_extra_token)(char *c, void *private), | |
208 | 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, | |
6ab00d46 SW |
213 | void *private, |
214 | unsigned supported_features, | |
215 | unsigned required_features); | |
3d14c5d2 YS |
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); | |
221 | ||
222 | /* pagevec.c */ | |
223 | extern void ceph_release_page_vector(struct page **pages, int num_pages); | |
224 | ||
225 | extern struct page **ceph_get_direct_page_vector(const char __user *data, | |
b6aa5901 HC |
226 | int num_pages, |
227 | bool write_page); | |
228 | extern void ceph_put_page_vector(struct page **pages, int num_pages, | |
229 | bool dirty); | |
3d14c5d2 YS |
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, | |
236 | const char *data, | |
237 | loff_t off, size_t len); | |
238 | extern int ceph_copy_from_page_vector(struct page **pages, | |
239 | char *data, | |
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); | |
244 | ||
245 | ||
246 | #endif /* _FS_CEPH_SUPER_H */ |