1 #ifndef _FS_CEPH_LIBCEPH_H 2 #define _FS_CEPH_LIBCEPH_H 3 4 #include <linux/ceph/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 <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> 24 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 33 #define CEPH_OPT_DEFAULT (0) 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_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; 58 struct ceph_crypto_key *key; 59 }; 60 61 /* 62 * defaults 63 */ 64 #define CEPH_MOUNT_TIMEOUT_DEFAULT 60 65 #define CEPH_OSD_KEEPALIVE_DEFAULT 5 66 #define CEPH_OSD_IDLE_TTL_DEFAULT 60 67 68 #define CEPH_MSG_MAX_FRONT_LEN (16*1024*1024) 69 #define CEPH_MSG_MAX_DATA_LEN (16*1024*1024) 70 71 #define CEPH_AUTH_NAME_DEFAULT "guest" 72 73 /* 74 * Delay telling the MDS we no longer want caps, in case we reopen 75 * the file. Delay a minimum amount of time, even if we send a cap 76 * message for some other reason. Otherwise, take the oppotunity to 77 * update the mds to avoid sending another message later. 78 */ 79 #define CEPH_CAPS_WANTED_DELAY_MIN_DEFAULT 5 /* cap release delay */ 80 #define CEPH_CAPS_WANTED_DELAY_MAX_DEFAULT 60 /* cap release delay */ 81 82 #define CEPH_CAP_RELEASE_SAFETY_DEFAULT (CEPH_CAPS_PER_RELEASE * 4) 83 84 /* mount state */ 85 enum { 86 CEPH_MOUNT_MOUNTING, 87 CEPH_MOUNT_MOUNTED, 88 CEPH_MOUNT_UNMOUNTING, 89 CEPH_MOUNT_UNMOUNTED, 90 CEPH_MOUNT_SHUTDOWN, 91 }; 92 93 /* 94 * subtract jiffies 95 */ 96 static inline unsigned long time_sub(unsigned long a, unsigned long b) 97 { 98 BUG_ON(time_after(b, a)); 99 return (long)a - (long)b; 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 u32 supported_features; 125 u32 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 #endif 136 }; 137 138 139 140 /* 141 * snapshots 142 */ 143 144 /* 145 * A "snap context" is the set of existing snapshots when we 146 * write data. It is used by the OSD to guide its COW behavior. 147 * 148 * The ceph_snap_context is refcounted, and attached to each dirty 149 * page, indicating which context the dirty data belonged when it was 150 * dirtied. 151 */ 152 struct ceph_snap_context { 153 atomic_t nref; 154 u64 seq; 155 u32 num_snaps; 156 u64 snaps[]; 157 }; 158 159 static inline struct ceph_snap_context * 160 ceph_get_snap_context(struct ceph_snap_context *sc) 161 { 162 /* 163 printk("get_snap_context %p %d -> %d\n", sc, atomic_read(&sc->nref), 164 atomic_read(&sc->nref)+1); 165 */ 166 if (sc) 167 atomic_inc(&sc->nref); 168 return sc; 169 } 170 171 static inline void ceph_put_snap_context(struct ceph_snap_context *sc) 172 { 173 if (!sc) 174 return; 175 /* 176 printk("put_snap_context %p %d -> %d\n", sc, atomic_read(&sc->nref), 177 atomic_read(&sc->nref)-1); 178 */ 179 if (atomic_dec_and_test(&sc->nref)) { 180 /*printk(" deleting snap_context %p\n", sc);*/ 181 kfree(sc); 182 } 183 } 184 185 /* 186 * calculate the number of pages a given length and offset map onto, 187 * if we align the data. 188 */ 189 static inline int calc_pages_for(u64 off, u64 len) 190 { 191 return ((off+len+PAGE_CACHE_SIZE-1) >> PAGE_CACHE_SHIFT) - 192 (off >> PAGE_CACHE_SHIFT); 193 } 194 195 /* ceph_common.c */ 196 extern bool libceph_compatible(void *data); 197 198 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; 204 205 extern struct ceph_options *ceph_parse_options(char *options, 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, 213 void *private, 214 unsigned supported_features, 215 unsigned required_features); 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 void __user *data, 226 int num_pages, 227 bool write_page); 228 extern void ceph_put_page_vector(struct page **pages, int num_pages, 229 bool dirty); 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 void __user *data, 234 loff_t off, size_t len); 235 extern void ceph_copy_to_page_vector(struct page **pages, 236 const void *data, 237 loff_t off, size_t len); 238 extern void ceph_copy_from_page_vector(struct page **pages, 239 void *data, 240 loff_t off, size_t len); 241 extern int ceph_copy_page_vector_to_user(struct page **pages, void __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 */ 247