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 #define CEPH_OPT_NOMSGAUTH (1<<4) /* not require cephx message signature */ 33 #define CEPH_OPT_TCP_NODELAY (1<<5) /* TCP_NODELAY on TCP sockets */ 34 35 #define CEPH_OPT_DEFAULT (CEPH_OPT_TCP_NODELAY) 36 37 #define ceph_set_opt(client, opt) \ 38 (client)->options->flags |= CEPH_OPT_##opt; 39 #define ceph_test_opt(client, opt) \ 40 (!!((client)->options->flags & CEPH_OPT_##opt)) 41 42 struct ceph_options { 43 int flags; 44 struct ceph_fsid fsid; 45 struct ceph_entity_addr my_addr; 46 int mount_timeout; 47 int osd_idle_ttl; 48 int osd_keepalive_timeout; 49 50 /* 51 * any type that can't be simply compared or doesn't need need 52 * to be compared should go beyond this point, 53 * ceph_compare_options() should be updated accordingly 54 */ 55 56 struct ceph_entity_addr *mon_addr; /* should be the first 57 pointer type of args */ 58 int num_mon; 59 char *name; 60 struct ceph_crypto_key *key; 61 }; 62 63 /* 64 * defaults 65 */ 66 #define CEPH_MOUNT_TIMEOUT_DEFAULT 60 67 #define CEPH_OSD_KEEPALIVE_DEFAULT 5 68 #define CEPH_OSD_IDLE_TTL_DEFAULT 60 69 70 #define CEPH_MSG_MAX_FRONT_LEN (16*1024*1024) 71 #define CEPH_MSG_MAX_MIDDLE_LEN (16*1024*1024) 72 #define CEPH_MSG_MAX_DATA_LEN (16*1024*1024) 73 74 #define CEPH_AUTH_NAME_DEFAULT "guest" 75 76 /* 77 * Delay telling the MDS we no longer want caps, in case we reopen 78 * the file. Delay a minimum amount of time, even if we send a cap 79 * message for some other reason. Otherwise, take the oppotunity to 80 * update the mds to avoid sending another message later. 81 */ 82 #define CEPH_CAPS_WANTED_DELAY_MIN_DEFAULT 5 /* cap release delay */ 83 #define CEPH_CAPS_WANTED_DELAY_MAX_DEFAULT 60 /* cap release delay */ 84 85 #define CEPH_CAP_RELEASE_SAFETY_DEFAULT (CEPH_CAPS_PER_RELEASE * 4) 86 87 /* mount state */ 88 enum { 89 CEPH_MOUNT_MOUNTING, 90 CEPH_MOUNT_MOUNTED, 91 CEPH_MOUNT_UNMOUNTING, 92 CEPH_MOUNT_UNMOUNTED, 93 CEPH_MOUNT_SHUTDOWN, 94 }; 95 96 /* 97 * subtract jiffies 98 */ 99 static inline unsigned long time_sub(unsigned long a, unsigned long b) 100 { 101 BUG_ON(time_after(b, a)); 102 return (long)a - (long)b; 103 } 104 105 struct ceph_mds_client; 106 107 /* 108 * per client state 109 * 110 * possibly shared by multiple mount points, if they are 111 * mounting the same ceph filesystem/cluster. 112 */ 113 struct ceph_client { 114 struct ceph_fsid fsid; 115 bool have_fsid; 116 117 void *private; 118 119 struct ceph_options *options; 120 121 struct mutex mount_mutex; /* serialize mount attempts */ 122 wait_queue_head_t auth_wq; 123 int auth_err; 124 125 int (*extra_mon_dispatch)(struct ceph_client *, struct ceph_msg *); 126 127 u64 supported_features; 128 u64 required_features; 129 130 struct ceph_messenger msgr; /* messenger instance */ 131 struct ceph_mon_client monc; 132 struct ceph_osd_client osdc; 133 134 #ifdef CONFIG_DEBUG_FS 135 struct dentry *debugfs_dir; 136 struct dentry *debugfs_monmap; 137 struct dentry *debugfs_osdmap; 138 struct dentry *debugfs_options; 139 #endif 140 }; 141 142 143 144 /* 145 * snapshots 146 */ 147 148 /* 149 * A "snap context" is the set of existing snapshots when we 150 * write data. It is used by the OSD to guide its COW behavior. 151 * 152 * The ceph_snap_context is refcounted, and attached to each dirty 153 * page, indicating which context the dirty data belonged when it was 154 * dirtied. 155 */ 156 struct ceph_snap_context { 157 atomic_t nref; 158 u64 seq; 159 u32 num_snaps; 160 u64 snaps[]; 161 }; 162 163 extern struct ceph_snap_context *ceph_create_snap_context(u32 snap_count, 164 gfp_t gfp_flags); 165 extern struct ceph_snap_context *ceph_get_snap_context( 166 struct ceph_snap_context *sc); 167 extern void ceph_put_snap_context(struct ceph_snap_context *sc); 168 169 /* 170 * calculate the number of pages a given length and offset map onto, 171 * if we align the data. 172 */ 173 static inline int calc_pages_for(u64 off, u64 len) 174 { 175 return ((off+len+PAGE_CACHE_SIZE-1) >> PAGE_CACHE_SHIFT) - 176 (off >> PAGE_CACHE_SHIFT); 177 } 178 179 extern struct kmem_cache *ceph_inode_cachep; 180 extern struct kmem_cache *ceph_cap_cachep; 181 extern struct kmem_cache *ceph_dentry_cachep; 182 extern struct kmem_cache *ceph_file_cachep; 183 184 /* ceph_common.c */ 185 extern bool libceph_compatible(void *data); 186 187 extern const char *ceph_msg_type_name(int type); 188 extern int ceph_check_fsid(struct ceph_client *client, struct ceph_fsid *fsid); 189 extern void *ceph_kvmalloc(size_t size, gfp_t flags); 190 191 extern struct ceph_options *ceph_parse_options(char *options, 192 const char *dev_name, const char *dev_name_end, 193 int (*parse_extra_token)(char *c, void *private), 194 void *private); 195 int ceph_print_client_options(struct seq_file *m, struct ceph_client *client); 196 extern void ceph_destroy_options(struct ceph_options *opt); 197 extern int ceph_compare_options(struct ceph_options *new_opt, 198 struct ceph_client *client); 199 extern struct ceph_client *ceph_create_client(struct ceph_options *opt, 200 void *private, 201 u64 supported_features, 202 u64 required_features); 203 extern u64 ceph_client_id(struct ceph_client *client); 204 extern void ceph_destroy_client(struct ceph_client *client); 205 extern int __ceph_open_session(struct ceph_client *client, 206 unsigned long started); 207 extern int ceph_open_session(struct ceph_client *client); 208 209 /* pagevec.c */ 210 extern void ceph_release_page_vector(struct page **pages, int num_pages); 211 212 extern struct page **ceph_get_direct_page_vector(const void __user *data, 213 int num_pages, 214 bool write_page); 215 extern void ceph_put_page_vector(struct page **pages, int num_pages, 216 bool dirty); 217 extern struct page **ceph_alloc_page_vector(int num_pages, gfp_t flags); 218 extern int ceph_copy_user_to_page_vector(struct page **pages, 219 const void __user *data, 220 loff_t off, size_t len); 221 extern void ceph_copy_to_page_vector(struct page **pages, 222 const void *data, 223 loff_t off, size_t len); 224 extern void ceph_copy_from_page_vector(struct page **pages, 225 void *data, 226 loff_t off, size_t len); 227 extern void ceph_zero_page_vector_range(int off, int len, struct page **pages); 228 229 230 #endif /* _FS_CEPH_SUPER_H */ 231