1 /* SPDX-License-Identifier: GPL-2.0 */ 2 #ifndef _FS_CEPH_LIBCEPH_H 3 #define _FS_CEPH_LIBCEPH_H 4 5 #include <linux/ceph/ceph_debug.h> 6 7 #include <asm/unaligned.h> 8 #include <linux/backing-dev.h> 9 #include <linux/completion.h> 10 #include <linux/exportfs.h> 11 #include <linux/bug.h> 12 #include <linux/fs.h> 13 #include <linux/mempool.h> 14 #include <linux/pagemap.h> 15 #include <linux/wait.h> 16 #include <linux/writeback.h> 17 #include <linux/slab.h> 18 #include <linux/refcount.h> 19 20 #include <linux/ceph/types.h> 21 #include <linux/ceph/messenger.h> 22 #include <linux/ceph/msgpool.h> 23 #include <linux/ceph/mon_client.h> 24 #include <linux/ceph/osd_client.h> 25 #include <linux/ceph/ceph_fs.h> 26 #include <linux/ceph/string_table.h> 27 28 /* 29 * mount options 30 */ 31 #define CEPH_OPT_FSID (1<<0) 32 #define CEPH_OPT_NOSHARE (1<<1) /* don't share client with other sbs */ 33 #define CEPH_OPT_MYIP (1<<2) /* specified my ip */ 34 #define CEPH_OPT_NOCRC (1<<3) /* no data crc on writes (msgr1) */ 35 #define CEPH_OPT_TCP_NODELAY (1<<4) /* TCP_NODELAY on TCP sockets */ 36 #define CEPH_OPT_NOMSGSIGN (1<<5) /* don't sign msgs (msgr1) */ 37 #define CEPH_OPT_ABORT_ON_FULL (1<<6) /* abort w/ ENOSPC when full */ 38 39 #define CEPH_OPT_DEFAULT (CEPH_OPT_TCP_NODELAY) 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 unsigned long mount_timeout; /* jiffies */ 51 unsigned long osd_idle_ttl; /* jiffies */ 52 unsigned long osd_keepalive_timeout; /* jiffies */ 53 unsigned long osd_request_timeout; /* jiffies */ 54 u32 read_from_replica; /* CEPH_OSD_FLAG_BALANCE/LOCALIZE_READS */ 55 int con_modes[2]; /* CEPH_CON_MODE_* */ 56 57 /* 58 * any type that can't be simply compared or doesn't need 59 * to be compared should go beyond this point, 60 * ceph_compare_options() should be updated accordingly 61 */ 62 63 struct ceph_entity_addr *mon_addr; /* should be the first 64 pointer type of args */ 65 int num_mon; 66 char *name; 67 struct ceph_crypto_key *key; 68 struct rb_root crush_locs; 69 }; 70 71 /* 72 * defaults 73 */ 74 #define CEPH_MOUNT_TIMEOUT_DEFAULT msecs_to_jiffies(60 * 1000) 75 #define CEPH_OSD_KEEPALIVE_DEFAULT msecs_to_jiffies(5 * 1000) 76 #define CEPH_OSD_IDLE_TTL_DEFAULT msecs_to_jiffies(60 * 1000) 77 #define CEPH_OSD_REQUEST_TIMEOUT_DEFAULT 0 /* no timeout */ 78 #define CEPH_READ_FROM_REPLICA_DEFAULT 0 /* read from primary */ 79 80 #define CEPH_MONC_HUNT_INTERVAL msecs_to_jiffies(3 * 1000) 81 #define CEPH_MONC_PING_INTERVAL msecs_to_jiffies(10 * 1000) 82 #define CEPH_MONC_PING_TIMEOUT msecs_to_jiffies(30 * 1000) 83 #define CEPH_MONC_HUNT_BACKOFF 2 84 #define CEPH_MONC_HUNT_MAX_MULT 10 85 86 #define CEPH_MSG_MAX_CONTROL_LEN (16*1024*1024) 87 #define CEPH_MSG_MAX_FRONT_LEN (16*1024*1024) 88 #define CEPH_MSG_MAX_MIDDLE_LEN (16*1024*1024) 89 90 /* 91 * The largest possible rbd data object is 32M. 92 * The largest possible rbd object map object is 64M. 93 * 94 * There is no limit on the size of cephfs objects, but it has to obey 95 * rsize and wsize mount options anyway. 96 */ 97 #define CEPH_MSG_MAX_DATA_LEN (64*1024*1024) 98 99 #define CEPH_AUTH_NAME_DEFAULT "guest" 100 101 /* mount state */ 102 enum { 103 CEPH_MOUNT_MOUNTING, 104 CEPH_MOUNT_MOUNTED, 105 CEPH_MOUNT_UNMOUNTING, 106 CEPH_MOUNT_UNMOUNTED, 107 CEPH_MOUNT_SHUTDOWN, 108 CEPH_MOUNT_RECOVER, 109 }; 110 111 static inline unsigned long ceph_timeout_jiffies(unsigned long timeout) 112 { 113 return timeout ?: MAX_SCHEDULE_TIMEOUT; 114 } 115 116 struct ceph_mds_client; 117 118 /* 119 * per client state 120 * 121 * possibly shared by multiple mount points, if they are 122 * mounting the same ceph filesystem/cluster. 123 */ 124 struct ceph_client { 125 struct ceph_fsid fsid; 126 bool have_fsid; 127 128 void *private; 129 130 struct ceph_options *options; 131 132 struct mutex mount_mutex; /* serialize mount attempts */ 133 wait_queue_head_t auth_wq; 134 int auth_err; 135 136 int (*extra_mon_dispatch)(struct ceph_client *, struct ceph_msg *); 137 138 u64 supported_features; 139 u64 required_features; 140 141 struct ceph_messenger msgr; /* messenger instance */ 142 struct ceph_mon_client monc; 143 struct ceph_osd_client osdc; 144 145 #ifdef CONFIG_DEBUG_FS 146 struct dentry *debugfs_dir; 147 struct dentry *debugfs_monmap; 148 struct dentry *debugfs_osdmap; 149 struct dentry *debugfs_options; 150 #endif 151 }; 152 153 #define from_msgr(ms) container_of(ms, struct ceph_client, msgr) 154 155 static inline bool ceph_msgr2(struct ceph_client *client) 156 { 157 return client->options->con_modes[0] != CEPH_CON_MODE_UNKNOWN; 158 } 159 160 /* 161 * snapshots 162 */ 163 164 /* 165 * A "snap context" is the set of existing snapshots when we 166 * write data. It is used by the OSD to guide its COW behavior. 167 * 168 * The ceph_snap_context is refcounted, and attached to each dirty 169 * page, indicating which context the dirty data belonged when it was 170 * dirtied. 171 */ 172 struct ceph_snap_context { 173 refcount_t nref; 174 u64 seq; 175 u32 num_snaps; 176 u64 snaps[]; 177 }; 178 179 extern struct ceph_snap_context *ceph_create_snap_context(u32 snap_count, 180 gfp_t gfp_flags); 181 extern struct ceph_snap_context *ceph_get_snap_context( 182 struct ceph_snap_context *sc); 183 extern void ceph_put_snap_context(struct ceph_snap_context *sc); 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_SIZE-1) >> PAGE_SHIFT) - 192 (off >> PAGE_SHIFT); 193 } 194 195 #define RB_BYVAL(a) (a) 196 #define RB_BYPTR(a) (&(a)) 197 #define RB_CMP3WAY(a, b) ((a) < (b) ? -1 : (a) > (b)) 198 199 #define DEFINE_RB_INSDEL_FUNCS2(name, type, keyfld, cmpexp, keyexp, nodefld) \ 200 static bool __insert_##name(struct rb_root *root, type *t) \ 201 { \ 202 struct rb_node **n = &root->rb_node; \ 203 struct rb_node *parent = NULL; \ 204 \ 205 BUG_ON(!RB_EMPTY_NODE(&t->nodefld)); \ 206 \ 207 while (*n) { \ 208 type *cur = rb_entry(*n, type, nodefld); \ 209 int cmp; \ 210 \ 211 parent = *n; \ 212 cmp = cmpexp(keyexp(t->keyfld), keyexp(cur->keyfld)); \ 213 if (cmp < 0) \ 214 n = &(*n)->rb_left; \ 215 else if (cmp > 0) \ 216 n = &(*n)->rb_right; \ 217 else \ 218 return false; \ 219 } \ 220 \ 221 rb_link_node(&t->nodefld, parent, n); \ 222 rb_insert_color(&t->nodefld, root); \ 223 return true; \ 224 } \ 225 static void __maybe_unused insert_##name(struct rb_root *root, type *t) \ 226 { \ 227 if (!__insert_##name(root, t)) \ 228 BUG(); \ 229 } \ 230 static void erase_##name(struct rb_root *root, type *t) \ 231 { \ 232 BUG_ON(RB_EMPTY_NODE(&t->nodefld)); \ 233 rb_erase(&t->nodefld, root); \ 234 RB_CLEAR_NODE(&t->nodefld); \ 235 } 236 237 /* 238 * @lookup_param_type is a parameter and not constructed from (@type, 239 * @keyfld) with typeof() because adding const is too unwieldy. 240 */ 241 #define DEFINE_RB_LOOKUP_FUNC2(name, type, keyfld, cmpexp, keyexp, \ 242 lookup_param_type, nodefld) \ 243 static type *lookup_##name(struct rb_root *root, lookup_param_type key) \ 244 { \ 245 struct rb_node *n = root->rb_node; \ 246 \ 247 while (n) { \ 248 type *cur = rb_entry(n, type, nodefld); \ 249 int cmp; \ 250 \ 251 cmp = cmpexp(key, keyexp(cur->keyfld)); \ 252 if (cmp < 0) \ 253 n = n->rb_left; \ 254 else if (cmp > 0) \ 255 n = n->rb_right; \ 256 else \ 257 return cur; \ 258 } \ 259 \ 260 return NULL; \ 261 } 262 263 #define DEFINE_RB_FUNCS2(name, type, keyfld, cmpexp, keyexp, \ 264 lookup_param_type, nodefld) \ 265 DEFINE_RB_INSDEL_FUNCS2(name, type, keyfld, cmpexp, keyexp, nodefld) \ 266 DEFINE_RB_LOOKUP_FUNC2(name, type, keyfld, cmpexp, keyexp, \ 267 lookup_param_type, nodefld) 268 269 /* 270 * Shorthands for integer keys. 271 */ 272 #define DEFINE_RB_INSDEL_FUNCS(name, type, keyfld, nodefld) \ 273 DEFINE_RB_INSDEL_FUNCS2(name, type, keyfld, RB_CMP3WAY, RB_BYVAL, nodefld) 274 275 #define DEFINE_RB_LOOKUP_FUNC(name, type, keyfld, nodefld) \ 276 extern type __lookup_##name##_key; \ 277 DEFINE_RB_LOOKUP_FUNC2(name, type, keyfld, RB_CMP3WAY, RB_BYVAL, \ 278 typeof(__lookup_##name##_key.keyfld), nodefld) 279 280 #define DEFINE_RB_FUNCS(name, type, keyfld, nodefld) \ 281 DEFINE_RB_INSDEL_FUNCS(name, type, keyfld, nodefld) \ 282 DEFINE_RB_LOOKUP_FUNC(name, type, keyfld, nodefld) 283 284 extern struct kmem_cache *ceph_inode_cachep; 285 extern struct kmem_cache *ceph_cap_cachep; 286 extern struct kmem_cache *ceph_cap_flush_cachep; 287 extern struct kmem_cache *ceph_dentry_cachep; 288 extern struct kmem_cache *ceph_file_cachep; 289 extern struct kmem_cache *ceph_dir_file_cachep; 290 extern struct kmem_cache *ceph_mds_request_cachep; 291 extern mempool_t *ceph_wb_pagevec_pool; 292 293 /* ceph_common.c */ 294 extern bool libceph_compatible(void *data); 295 296 extern const char *ceph_msg_type_name(int type); 297 extern int ceph_check_fsid(struct ceph_client *client, struct ceph_fsid *fsid); 298 extern int ceph_parse_fsid(const char *str, struct ceph_fsid *fsid); 299 300 struct fs_parameter; 301 struct fc_log; 302 struct ceph_options *ceph_alloc_options(void); 303 int ceph_parse_mon_ips(const char *buf, size_t len, struct ceph_options *opt, 304 struct fc_log *l, char delim); 305 int ceph_parse_param(struct fs_parameter *param, struct ceph_options *opt, 306 struct fc_log *l); 307 int ceph_print_client_options(struct seq_file *m, struct ceph_client *client, 308 bool show_all); 309 extern void ceph_destroy_options(struct ceph_options *opt); 310 extern int ceph_compare_options(struct ceph_options *new_opt, 311 struct ceph_client *client); 312 struct ceph_client *ceph_create_client(struct ceph_options *opt, void *private); 313 struct ceph_entity_addr *ceph_client_addr(struct ceph_client *client); 314 u64 ceph_client_gid(struct ceph_client *client); 315 extern void ceph_destroy_client(struct ceph_client *client); 316 extern void ceph_reset_client_addr(struct ceph_client *client); 317 extern int __ceph_open_session(struct ceph_client *client, 318 unsigned long started); 319 extern int ceph_open_session(struct ceph_client *client); 320 int ceph_wait_for_latest_osdmap(struct ceph_client *client, 321 unsigned long timeout); 322 323 /* pagevec.c */ 324 extern void ceph_release_page_vector(struct page **pages, int num_pages); 325 extern void ceph_put_page_vector(struct page **pages, int num_pages, 326 bool dirty); 327 extern struct page **ceph_alloc_page_vector(int num_pages, gfp_t flags); 328 extern int ceph_copy_user_to_page_vector(struct page **pages, 329 const void __user *data, 330 loff_t off, size_t len); 331 extern void ceph_copy_to_page_vector(struct page **pages, 332 const void *data, 333 loff_t off, size_t len); 334 extern void ceph_copy_from_page_vector(struct page **pages, 335 void *data, 336 loff_t off, size_t len); 337 extern void ceph_zero_page_vector_range(int off, int len, struct page **pages); 338 339 340 #endif /* _FS_CEPH_SUPER_H */ 341