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3d14c5d2 YS |
1 | #ifndef _FS_CEPH_LIBCEPH_H |
2 | #define _FS_CEPH_LIBCEPH_H | |
3 | ||
a1ce3928 | 4 | #include <linux/ceph/ceph_debug.h> |
3d14c5d2 YS |
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 | ||
a1ce3928 DH |
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> | |
3d14c5d2 | 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; | |
3d14c5d2 YS |
46 | int osd_keepalive_timeout; |
47 | ||
48 | /* | |
49 | * any type that can't be simply compared or doesn't need need | |
50 | * to be compared should go beyond this point, | |
51 | * ceph_compare_options() should be updated accordingly | |
52 | */ | |
53 | ||
54 | struct ceph_entity_addr *mon_addr; /* should be the first | |
55 | pointer type of args */ | |
56 | int num_mon; | |
57 | char *name; | |
8323c3aa | 58 | struct ceph_crypto_key *key; |
3d14c5d2 YS |
59 | }; |
60 | ||
61 | /* | |
62 | * defaults | |
63 | */ | |
64 | #define CEPH_MOUNT_TIMEOUT_DEFAULT 60 | |
3d14c5d2 YS |
65 | #define CEPH_OSD_KEEPALIVE_DEFAULT 5 |
66 | #define CEPH_OSD_IDLE_TTL_DEFAULT 60 | |
3d14c5d2 YS |
67 | |
68 | #define CEPH_MSG_MAX_FRONT_LEN (16*1024*1024) | |
7b11ba37 | 69 | #define CEPH_MSG_MAX_MIDDLE_LEN (16*1024*1024) |
3d14c5d2 YS |
70 | #define CEPH_MSG_MAX_DATA_LEN (16*1024*1024) |
71 | ||
72 | #define CEPH_AUTH_NAME_DEFAULT "guest" | |
73 | ||
74 | /* | |
75 | * Delay telling the MDS we no longer want caps, in case we reopen | |
76 | * the file. Delay a minimum amount of time, even if we send a cap | |
77 | * message for some other reason. Otherwise, take the oppotunity to | |
78 | * update the mds to avoid sending another message later. | |
79 | */ | |
80 | #define CEPH_CAPS_WANTED_DELAY_MIN_DEFAULT 5 /* cap release delay */ | |
81 | #define CEPH_CAPS_WANTED_DELAY_MAX_DEFAULT 60 /* cap release delay */ | |
82 | ||
83 | #define CEPH_CAP_RELEASE_SAFETY_DEFAULT (CEPH_CAPS_PER_RELEASE * 4) | |
84 | ||
85 | /* mount state */ | |
86 | enum { | |
87 | CEPH_MOUNT_MOUNTING, | |
88 | CEPH_MOUNT_MOUNTED, | |
89 | CEPH_MOUNT_UNMOUNTING, | |
90 | CEPH_MOUNT_UNMOUNTED, | |
91 | CEPH_MOUNT_SHUTDOWN, | |
92 | }; | |
93 | ||
94 | /* | |
95 | * subtract jiffies | |
96 | */ | |
97 | static inline unsigned long time_sub(unsigned long a, unsigned long b) | |
98 | { | |
99 | BUG_ON(time_after(b, a)); | |
100 | return (long)a - (long)b; | |
101 | } | |
102 | ||
103 | struct ceph_mds_client; | |
104 | ||
105 | /* | |
106 | * per client state | |
107 | * | |
108 | * possibly shared by multiple mount points, if they are | |
109 | * mounting the same ceph filesystem/cluster. | |
110 | */ | |
111 | struct ceph_client { | |
112 | struct ceph_fsid fsid; | |
113 | bool have_fsid; | |
114 | ||
115 | void *private; | |
116 | ||
117 | struct ceph_options *options; | |
118 | ||
119 | struct mutex mount_mutex; /* serialize mount attempts */ | |
120 | wait_queue_head_t auth_wq; | |
121 | int auth_err; | |
122 | ||
123 | int (*extra_mon_dispatch)(struct ceph_client *, struct ceph_msg *); | |
124 | ||
125 | u32 supported_features; | |
126 | u32 required_features; | |
127 | ||
15d9882c | 128 | struct ceph_messenger msgr; /* messenger instance */ |
3d14c5d2 YS |
129 | struct ceph_mon_client monc; |
130 | struct ceph_osd_client osdc; | |
131 | ||
132 | #ifdef CONFIG_DEBUG_FS | |
133 | struct dentry *debugfs_dir; | |
134 | struct dentry *debugfs_monmap; | |
135 | struct dentry *debugfs_osdmap; | |
136 | #endif | |
137 | }; | |
138 | ||
139 | ||
140 | ||
141 | /* | |
142 | * snapshots | |
143 | */ | |
144 | ||
145 | /* | |
146 | * A "snap context" is the set of existing snapshots when we | |
147 | * write data. It is used by the OSD to guide its COW behavior. | |
148 | * | |
149 | * The ceph_snap_context is refcounted, and attached to each dirty | |
150 | * page, indicating which context the dirty data belonged when it was | |
151 | * dirtied. | |
152 | */ | |
153 | struct ceph_snap_context { | |
154 | atomic_t nref; | |
155 | u64 seq; | |
aa711ee3 | 156 | u32 num_snaps; |
3d14c5d2 YS |
157 | u64 snaps[]; |
158 | }; | |
159 | ||
4f0dcb10 AE |
160 | extern struct ceph_snap_context *ceph_create_snap_context(u32 snap_count, |
161 | gfp_t gfp_flags); | |
162 | extern struct ceph_snap_context *ceph_get_snap_context( | |
163 | struct ceph_snap_context *sc); | |
164 | extern void ceph_put_snap_context(struct ceph_snap_context *sc); | |
3d14c5d2 YS |
165 | |
166 | /* | |
167 | * calculate the number of pages a given length and offset map onto, | |
168 | * if we align the data. | |
169 | */ | |
170 | static inline int calc_pages_for(u64 off, u64 len) | |
171 | { | |
172 | return ((off+len+PAGE_CACHE_SIZE-1) >> PAGE_CACHE_SHIFT) - | |
173 | (off >> PAGE_CACHE_SHIFT); | |
174 | } | |
175 | ||
176 | /* ceph_common.c */ | |
72fe25e3 AE |
177 | extern bool libceph_compatible(void *data); |
178 | ||
3d14c5d2 YS |
179 | extern const char *ceph_msg_type_name(int type); |
180 | extern int ceph_check_fsid(struct ceph_client *client, struct ceph_fsid *fsid); | |
181 | extern struct kmem_cache *ceph_inode_cachep; | |
182 | extern struct kmem_cache *ceph_cap_cachep; | |
183 | extern struct kmem_cache *ceph_dentry_cachep; | |
184 | extern struct kmem_cache *ceph_file_cachep; | |
185 | ||
ee57741c | 186 | extern struct ceph_options *ceph_parse_options(char *options, |
3d14c5d2 YS |
187 | const char *dev_name, const char *dev_name_end, |
188 | int (*parse_extra_token)(char *c, void *private), | |
189 | void *private); | |
190 | extern void ceph_destroy_options(struct ceph_options *opt); | |
191 | extern int ceph_compare_options(struct ceph_options *new_opt, | |
192 | struct ceph_client *client); | |
193 | extern struct ceph_client *ceph_create_client(struct ceph_options *opt, | |
6ab00d46 SW |
194 | void *private, |
195 | unsigned supported_features, | |
196 | unsigned required_features); | |
3d14c5d2 YS |
197 | extern u64 ceph_client_id(struct ceph_client *client); |
198 | extern void ceph_destroy_client(struct ceph_client *client); | |
199 | extern int __ceph_open_session(struct ceph_client *client, | |
200 | unsigned long started); | |
201 | extern int ceph_open_session(struct ceph_client *client); | |
202 | ||
203 | /* pagevec.c */ | |
204 | extern void ceph_release_page_vector(struct page **pages, int num_pages); | |
205 | ||
b324814e | 206 | extern struct page **ceph_get_direct_page_vector(const void __user *data, |
b6aa5901 HC |
207 | int num_pages, |
208 | bool write_page); | |
209 | extern void ceph_put_page_vector(struct page **pages, int num_pages, | |
210 | bool dirty); | |
3d14c5d2 YS |
211 | extern void ceph_release_page_vector(struct page **pages, int num_pages); |
212 | extern struct page **ceph_alloc_page_vector(int num_pages, gfp_t flags); | |
213 | extern int ceph_copy_user_to_page_vector(struct page **pages, | |
b324814e | 214 | const void __user *data, |
3d14c5d2 | 215 | loff_t off, size_t len); |
903bb32e | 216 | extern void ceph_copy_to_page_vector(struct page **pages, |
b324814e | 217 | const void *data, |
3d14c5d2 | 218 | loff_t off, size_t len); |
903bb32e | 219 | extern void ceph_copy_from_page_vector(struct page **pages, |
b324814e | 220 | void *data, |
3d14c5d2 | 221 | loff_t off, size_t len); |
b324814e | 222 | extern int ceph_copy_page_vector_to_user(struct page **pages, void __user *data, |
3d14c5d2 YS |
223 | loff_t off, size_t len); |
224 | extern void ceph_zero_page_vector_range(int off, int len, struct page **pages); | |
225 | ||
226 | ||
227 | #endif /* _FS_CEPH_SUPER_H */ |