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 */ 35 #define CEPH_OPT_NOMSGAUTH (1<<4) /* don't require msg signing feat */ 36 #define CEPH_OPT_TCP_NODELAY (1<<5) /* TCP_NODELAY on TCP sockets */ 37 #define CEPH_OPT_NOMSGSIGN (1<<6) /* don't sign msgs */ 38 #define CEPH_OPT_ABORT_ON_FULL (1<<7) /* abort w/ ENOSPC when full */ 39 40 #define CEPH_OPT_DEFAULT (CEPH_OPT_TCP_NODELAY) 41 42 #define ceph_set_opt(client, opt) \ 43 (client)->options->flags |= CEPH_OPT_##opt; 44 #define ceph_test_opt(client, opt) \ 45 (!!((client)->options->flags & CEPH_OPT_##opt)) 46 47 struct ceph_options { 48 int flags; 49 struct ceph_fsid fsid; 50 struct ceph_entity_addr my_addr; 51 unsigned long mount_timeout; /* jiffies */ 52 unsigned long osd_idle_ttl; /* jiffies */ 53 unsigned long osd_keepalive_timeout; /* jiffies */ 54 unsigned long osd_request_timeout; /* jiffies */ 55 u32 read_from_replica; /* CEPH_OSD_FLAG_BALANCE/LOCALIZE_READS */ 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_FRONT_LEN (16*1024*1024) 87 #define CEPH_MSG_MAX_MIDDLE_LEN (16*1024*1024) 88 89 /* 90 * The largest possible rbd data object is 32M. 91 * The largest possible rbd object map object is 64M. 92 * 93 * There is no limit on the size of cephfs objects, but it has to obey 94 * rsize and wsize mount options anyway. 95 */ 96 #define CEPH_MSG_MAX_DATA_LEN (64*1024*1024) 97 98 #define CEPH_AUTH_NAME_DEFAULT "guest" 99 100 /* mount state */ 101 enum { 102 CEPH_MOUNT_MOUNTING, 103 CEPH_MOUNT_MOUNTED, 104 CEPH_MOUNT_UNMOUNTING, 105 CEPH_MOUNT_UNMOUNTED, 106 CEPH_MOUNT_SHUTDOWN, 107 }; 108 109 static inline unsigned long ceph_timeout_jiffies(unsigned long timeout) 110 { 111 return timeout ?: MAX_SCHEDULE_TIMEOUT; 112 } 113 114 struct ceph_mds_client; 115 116 /* 117 * per client state 118 * 119 * possibly shared by multiple mount points, if they are 120 * mounting the same ceph filesystem/cluster. 121 */ 122 struct ceph_client { 123 struct ceph_fsid fsid; 124 bool have_fsid; 125 126 void *private; 127 128 struct ceph_options *options; 129 130 struct mutex mount_mutex; /* serialize mount attempts */ 131 wait_queue_head_t auth_wq; 132 int auth_err; 133 134 int (*extra_mon_dispatch)(struct ceph_client *, struct ceph_msg *); 135 136 u64 supported_features; 137 u64 required_features; 138 139 struct ceph_messenger msgr; /* messenger instance */ 140 struct ceph_mon_client monc; 141 struct ceph_osd_client osdc; 142 143 #ifdef CONFIG_DEBUG_FS 144 struct dentry *debugfs_dir; 145 struct dentry *debugfs_monmap; 146 struct dentry *debugfs_osdmap; 147 struct dentry *debugfs_options; 148 #endif 149 }; 150 151 #define from_msgr(ms) container_of(ms, struct ceph_client, msgr) 152 153 154 /* 155 * snapshots 156 */ 157 158 /* 159 * A "snap context" is the set of existing snapshots when we 160 * write data. It is used by the OSD to guide its COW behavior. 161 * 162 * The ceph_snap_context is refcounted, and attached to each dirty 163 * page, indicating which context the dirty data belonged when it was 164 * dirtied. 165 */ 166 struct ceph_snap_context { 167 refcount_t nref; 168 u64 seq; 169 u32 num_snaps; 170 u64 snaps[]; 171 }; 172 173 extern struct ceph_snap_context *ceph_create_snap_context(u32 snap_count, 174 gfp_t gfp_flags); 175 extern struct ceph_snap_context *ceph_get_snap_context( 176 struct ceph_snap_context *sc); 177 extern void ceph_put_snap_context(struct ceph_snap_context *sc); 178 179 /* 180 * calculate the number of pages a given length and offset map onto, 181 * if we align the data. 182 */ 183 static inline int calc_pages_for(u64 off, u64 len) 184 { 185 return ((off+len+PAGE_SIZE-1) >> PAGE_SHIFT) - 186 (off >> PAGE_SHIFT); 187 } 188 189 #define RB_BYVAL(a) (a) 190 #define RB_BYPTR(a) (&(a)) 191 #define RB_CMP3WAY(a, b) ((a) < (b) ? -1 : (a) > (b)) 192 193 #define DEFINE_RB_INSDEL_FUNCS2(name, type, keyfld, cmpexp, keyexp, nodefld) \ 194 static bool __insert_##name(struct rb_root *root, type *t) \ 195 { \ 196 struct rb_node **n = &root->rb_node; \ 197 struct rb_node *parent = NULL; \ 198 \ 199 BUG_ON(!RB_EMPTY_NODE(&t->nodefld)); \ 200 \ 201 while (*n) { \ 202 type *cur = rb_entry(*n, type, nodefld); \ 203 int cmp; \ 204 \ 205 parent = *n; \ 206 cmp = cmpexp(keyexp(t->keyfld), keyexp(cur->keyfld)); \ 207 if (cmp < 0) \ 208 n = &(*n)->rb_left; \ 209 else if (cmp > 0) \ 210 n = &(*n)->rb_right; \ 211 else \ 212 return false; \ 213 } \ 214 \ 215 rb_link_node(&t->nodefld, parent, n); \ 216 rb_insert_color(&t->nodefld, root); \ 217 return true; \ 218 } \ 219 static void __maybe_unused insert_##name(struct rb_root *root, type *t) \ 220 { \ 221 if (!__insert_##name(root, t)) \ 222 BUG(); \ 223 } \ 224 static void erase_##name(struct rb_root *root, type *t) \ 225 { \ 226 BUG_ON(RB_EMPTY_NODE(&t->nodefld)); \ 227 rb_erase(&t->nodefld, root); \ 228 RB_CLEAR_NODE(&t->nodefld); \ 229 } 230 231 /* 232 * @lookup_param_type is a parameter and not constructed from (@type, 233 * @keyfld) with typeof() because adding const is too unwieldy. 234 */ 235 #define DEFINE_RB_LOOKUP_FUNC2(name, type, keyfld, cmpexp, keyexp, \ 236 lookup_param_type, nodefld) \ 237 static type *lookup_##name(struct rb_root *root, lookup_param_type key) \ 238 { \ 239 struct rb_node *n = root->rb_node; \ 240 \ 241 while (n) { \ 242 type *cur = rb_entry(n, type, nodefld); \ 243 int cmp; \ 244 \ 245 cmp = cmpexp(key, keyexp(cur->keyfld)); \ 246 if (cmp < 0) \ 247 n = n->rb_left; \ 248 else if (cmp > 0) \ 249 n = n->rb_right; \ 250 else \ 251 return cur; \ 252 } \ 253 \ 254 return NULL; \ 255 } 256 257 #define DEFINE_RB_FUNCS2(name, type, keyfld, cmpexp, keyexp, \ 258 lookup_param_type, nodefld) \ 259 DEFINE_RB_INSDEL_FUNCS2(name, type, keyfld, cmpexp, keyexp, nodefld) \ 260 DEFINE_RB_LOOKUP_FUNC2(name, type, keyfld, cmpexp, keyexp, \ 261 lookup_param_type, nodefld) 262 263 /* 264 * Shorthands for integer keys. 265 */ 266 #define DEFINE_RB_INSDEL_FUNCS(name, type, keyfld, nodefld) \ 267 DEFINE_RB_INSDEL_FUNCS2(name, type, keyfld, RB_CMP3WAY, RB_BYVAL, nodefld) 268 269 #define DEFINE_RB_LOOKUP_FUNC(name, type, keyfld, nodefld) \ 270 extern type __lookup_##name##_key; \ 271 DEFINE_RB_LOOKUP_FUNC2(name, type, keyfld, RB_CMP3WAY, RB_BYVAL, \ 272 typeof(__lookup_##name##_key.keyfld), nodefld) 273 274 #define DEFINE_RB_FUNCS(name, type, keyfld, nodefld) \ 275 DEFINE_RB_INSDEL_FUNCS(name, type, keyfld, nodefld) \ 276 DEFINE_RB_LOOKUP_FUNC(name, type, keyfld, nodefld) 277 278 extern struct kmem_cache *ceph_inode_cachep; 279 extern struct kmem_cache *ceph_cap_cachep; 280 extern struct kmem_cache *ceph_cap_flush_cachep; 281 extern struct kmem_cache *ceph_dentry_cachep; 282 extern struct kmem_cache *ceph_file_cachep; 283 extern struct kmem_cache *ceph_dir_file_cachep; 284 extern struct kmem_cache *ceph_mds_request_cachep; 285 286 /* ceph_common.c */ 287 extern bool libceph_compatible(void *data); 288 289 extern const char *ceph_msg_type_name(int type); 290 extern int ceph_check_fsid(struct ceph_client *client, struct ceph_fsid *fsid); 291 extern void *ceph_kvmalloc(size_t size, gfp_t flags); 292 293 struct fs_parameter; 294 struct fc_log; 295 struct ceph_options *ceph_alloc_options(void); 296 int ceph_parse_mon_ips(const char *buf, size_t len, struct ceph_options *opt, 297 struct fc_log *l); 298 int ceph_parse_param(struct fs_parameter *param, struct ceph_options *opt, 299 struct fc_log *l); 300 int ceph_print_client_options(struct seq_file *m, struct ceph_client *client, 301 bool show_all); 302 extern void ceph_destroy_options(struct ceph_options *opt); 303 extern int ceph_compare_options(struct ceph_options *new_opt, 304 struct ceph_client *client); 305 struct ceph_client *ceph_create_client(struct ceph_options *opt, void *private); 306 struct ceph_entity_addr *ceph_client_addr(struct ceph_client *client); 307 u64 ceph_client_gid(struct ceph_client *client); 308 extern void ceph_destroy_client(struct ceph_client *client); 309 extern void ceph_reset_client_addr(struct ceph_client *client); 310 extern int __ceph_open_session(struct ceph_client *client, 311 unsigned long started); 312 extern int ceph_open_session(struct ceph_client *client); 313 int ceph_wait_for_latest_osdmap(struct ceph_client *client, 314 unsigned long timeout); 315 316 /* pagevec.c */ 317 extern void ceph_release_page_vector(struct page **pages, int num_pages); 318 extern void ceph_put_page_vector(struct page **pages, int num_pages, 319 bool dirty); 320 extern struct page **ceph_alloc_page_vector(int num_pages, gfp_t flags); 321 extern int ceph_copy_user_to_page_vector(struct page **pages, 322 const void __user *data, 323 loff_t off, size_t len); 324 extern void ceph_copy_to_page_vector(struct page **pages, 325 const void *data, 326 loff_t off, size_t len); 327 extern void ceph_copy_from_page_vector(struct page **pages, 328 void *data, 329 loff_t off, size_t len); 330 extern void ceph_zero_page_vector_range(int off, int len, struct page **pages); 331 332 333 #endif /* _FS_CEPH_SUPER_H */ 334