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 56 /* 57 * any type that can't be simply compared or doesn't need 58 * to be compared should go beyond this point, 59 * ceph_compare_options() should be updated accordingly 60 */ 61 62 struct ceph_entity_addr *mon_addr; /* should be the first 63 pointer type of args */ 64 int num_mon; 65 char *name; 66 struct ceph_crypto_key *key; 67 }; 68 69 /* 70 * defaults 71 */ 72 #define CEPH_MOUNT_TIMEOUT_DEFAULT msecs_to_jiffies(60 * 1000) 73 #define CEPH_OSD_KEEPALIVE_DEFAULT msecs_to_jiffies(5 * 1000) 74 #define CEPH_OSD_IDLE_TTL_DEFAULT msecs_to_jiffies(60 * 1000) 75 #define CEPH_OSD_REQUEST_TIMEOUT_DEFAULT 0 /* no timeout */ 76 77 #define CEPH_MONC_HUNT_INTERVAL msecs_to_jiffies(3 * 1000) 78 #define CEPH_MONC_PING_INTERVAL msecs_to_jiffies(10 * 1000) 79 #define CEPH_MONC_PING_TIMEOUT msecs_to_jiffies(30 * 1000) 80 #define CEPH_MONC_HUNT_BACKOFF 2 81 #define CEPH_MONC_HUNT_MAX_MULT 10 82 83 #define CEPH_MSG_MAX_FRONT_LEN (16*1024*1024) 84 #define CEPH_MSG_MAX_MIDDLE_LEN (16*1024*1024) 85 86 /* 87 * Handle the largest possible rbd object in one message. 88 * There is no limit on the size of cephfs objects, but it has to obey 89 * rsize and wsize mount options anyway. 90 */ 91 #define CEPH_MSG_MAX_DATA_LEN (32*1024*1024) 92 93 #define CEPH_AUTH_NAME_DEFAULT "guest" 94 95 /* mount state */ 96 enum { 97 CEPH_MOUNT_MOUNTING, 98 CEPH_MOUNT_MOUNTED, 99 CEPH_MOUNT_UNMOUNTING, 100 CEPH_MOUNT_UNMOUNTED, 101 CEPH_MOUNT_SHUTDOWN, 102 }; 103 104 static inline unsigned long ceph_timeout_jiffies(unsigned long timeout) 105 { 106 return timeout ?: MAX_SCHEDULE_TIMEOUT; 107 } 108 109 struct ceph_mds_client; 110 111 /* 112 * per client state 113 * 114 * possibly shared by multiple mount points, if they are 115 * mounting the same ceph filesystem/cluster. 116 */ 117 struct ceph_client { 118 struct ceph_fsid fsid; 119 bool have_fsid; 120 121 void *private; 122 123 struct ceph_options *options; 124 125 struct mutex mount_mutex; /* serialize mount attempts */ 126 wait_queue_head_t auth_wq; 127 int auth_err; 128 129 int (*extra_mon_dispatch)(struct ceph_client *, struct ceph_msg *); 130 131 u64 supported_features; 132 u64 required_features; 133 134 struct ceph_messenger msgr; /* messenger instance */ 135 struct ceph_mon_client monc; 136 struct ceph_osd_client osdc; 137 138 #ifdef CONFIG_DEBUG_FS 139 struct dentry *debugfs_dir; 140 struct dentry *debugfs_monmap; 141 struct dentry *debugfs_osdmap; 142 struct dentry *debugfs_options; 143 #endif 144 }; 145 146 #define from_msgr(ms) container_of(ms, struct ceph_client, msgr) 147 148 149 /* 150 * snapshots 151 */ 152 153 /* 154 * A "snap context" is the set of existing snapshots when we 155 * write data. It is used by the OSD to guide its COW behavior. 156 * 157 * The ceph_snap_context is refcounted, and attached to each dirty 158 * page, indicating which context the dirty data belonged when it was 159 * dirtied. 160 */ 161 struct ceph_snap_context { 162 refcount_t nref; 163 u64 seq; 164 u32 num_snaps; 165 u64 snaps[]; 166 }; 167 168 extern struct ceph_snap_context *ceph_create_snap_context(u32 snap_count, 169 gfp_t gfp_flags); 170 extern struct ceph_snap_context *ceph_get_snap_context( 171 struct ceph_snap_context *sc); 172 extern void ceph_put_snap_context(struct ceph_snap_context *sc); 173 174 /* 175 * calculate the number of pages a given length and offset map onto, 176 * if we align the data. 177 */ 178 static inline int calc_pages_for(u64 off, u64 len) 179 { 180 return ((off+len+PAGE_SIZE-1) >> PAGE_SHIFT) - 181 (off >> PAGE_SHIFT); 182 } 183 184 #define RB_BYVAL(a) (a) 185 #define RB_BYPTR(a) (&(a)) 186 #define RB_CMP3WAY(a, b) ((a) < (b) ? -1 : (a) > (b)) 187 188 #define DEFINE_RB_INSDEL_FUNCS2(name, type, keyfld, cmpexp, keyexp, nodefld) \ 189 static void insert_##name(struct rb_root *root, type *t) \ 190 { \ 191 struct rb_node **n = &root->rb_node; \ 192 struct rb_node *parent = NULL; \ 193 \ 194 BUG_ON(!RB_EMPTY_NODE(&t->nodefld)); \ 195 \ 196 while (*n) { \ 197 type *cur = rb_entry(*n, type, nodefld); \ 198 int cmp; \ 199 \ 200 parent = *n; \ 201 cmp = cmpexp(keyexp(t->keyfld), keyexp(cur->keyfld)); \ 202 if (cmp < 0) \ 203 n = &(*n)->rb_left; \ 204 else if (cmp > 0) \ 205 n = &(*n)->rb_right; \ 206 else \ 207 BUG(); \ 208 } \ 209 \ 210 rb_link_node(&t->nodefld, parent, n); \ 211 rb_insert_color(&t->nodefld, root); \ 212 } \ 213 static void erase_##name(struct rb_root *root, type *t) \ 214 { \ 215 BUG_ON(RB_EMPTY_NODE(&t->nodefld)); \ 216 rb_erase(&t->nodefld, root); \ 217 RB_CLEAR_NODE(&t->nodefld); \ 218 } 219 220 /* 221 * @lookup_param_type is a parameter and not constructed from (@type, 222 * @keyfld) with typeof() because adding const is too unwieldy. 223 */ 224 #define DEFINE_RB_LOOKUP_FUNC2(name, type, keyfld, cmpexp, keyexp, \ 225 lookup_param_type, nodefld) \ 226 static type *lookup_##name(struct rb_root *root, lookup_param_type key) \ 227 { \ 228 struct rb_node *n = root->rb_node; \ 229 \ 230 while (n) { \ 231 type *cur = rb_entry(n, type, nodefld); \ 232 int cmp; \ 233 \ 234 cmp = cmpexp(key, keyexp(cur->keyfld)); \ 235 if (cmp < 0) \ 236 n = n->rb_left; \ 237 else if (cmp > 0) \ 238 n = n->rb_right; \ 239 else \ 240 return cur; \ 241 } \ 242 \ 243 return NULL; \ 244 } 245 246 #define DEFINE_RB_FUNCS2(name, type, keyfld, cmpexp, keyexp, \ 247 lookup_param_type, nodefld) \ 248 DEFINE_RB_INSDEL_FUNCS2(name, type, keyfld, cmpexp, keyexp, nodefld) \ 249 DEFINE_RB_LOOKUP_FUNC2(name, type, keyfld, cmpexp, keyexp, \ 250 lookup_param_type, nodefld) 251 252 /* 253 * Shorthands for integer keys. 254 */ 255 #define DEFINE_RB_INSDEL_FUNCS(name, type, keyfld, nodefld) \ 256 DEFINE_RB_INSDEL_FUNCS2(name, type, keyfld, RB_CMP3WAY, RB_BYVAL, nodefld) 257 258 #define DEFINE_RB_LOOKUP_FUNC(name, type, keyfld, nodefld) \ 259 extern type __lookup_##name##_key; \ 260 DEFINE_RB_LOOKUP_FUNC2(name, type, keyfld, RB_CMP3WAY, RB_BYVAL, \ 261 typeof(__lookup_##name##_key.keyfld), nodefld) 262 263 #define DEFINE_RB_FUNCS(name, type, keyfld, nodefld) \ 264 DEFINE_RB_INSDEL_FUNCS(name, type, keyfld, nodefld) \ 265 DEFINE_RB_LOOKUP_FUNC(name, type, keyfld, nodefld) 266 267 extern struct kmem_cache *ceph_inode_cachep; 268 extern struct kmem_cache *ceph_cap_cachep; 269 extern struct kmem_cache *ceph_cap_flush_cachep; 270 extern struct kmem_cache *ceph_dentry_cachep; 271 extern struct kmem_cache *ceph_file_cachep; 272 extern struct kmem_cache *ceph_dir_file_cachep; 273 274 /* ceph_common.c */ 275 extern bool libceph_compatible(void *data); 276 277 extern const char *ceph_msg_type_name(int type); 278 extern int ceph_check_fsid(struct ceph_client *client, struct ceph_fsid *fsid); 279 extern void *ceph_kvmalloc(size_t size, gfp_t flags); 280 281 extern struct ceph_options *ceph_parse_options(char *options, 282 const char *dev_name, const char *dev_name_end, 283 int (*parse_extra_token)(char *c, void *private), 284 void *private); 285 int ceph_print_client_options(struct seq_file *m, struct ceph_client *client, 286 bool show_all); 287 extern void ceph_destroy_options(struct ceph_options *opt); 288 extern int ceph_compare_options(struct ceph_options *new_opt, 289 struct ceph_client *client); 290 struct ceph_client *ceph_create_client(struct ceph_options *opt, void *private); 291 struct ceph_entity_addr *ceph_client_addr(struct ceph_client *client); 292 u64 ceph_client_gid(struct ceph_client *client); 293 extern void ceph_destroy_client(struct ceph_client *client); 294 extern int __ceph_open_session(struct ceph_client *client, 295 unsigned long started); 296 extern int ceph_open_session(struct ceph_client *client); 297 298 /* pagevec.c */ 299 extern void ceph_release_page_vector(struct page **pages, int num_pages); 300 301 extern struct page **ceph_get_direct_page_vector(const void __user *data, 302 int num_pages, 303 bool write_page); 304 extern void ceph_put_page_vector(struct page **pages, int num_pages, 305 bool dirty); 306 extern struct page **ceph_alloc_page_vector(int num_pages, gfp_t flags); 307 extern int ceph_copy_user_to_page_vector(struct page **pages, 308 const void __user *data, 309 loff_t off, size_t len); 310 extern void ceph_copy_to_page_vector(struct page **pages, 311 const void *data, 312 loff_t off, size_t len); 313 extern void ceph_copy_from_page_vector(struct page **pages, 314 void *data, 315 loff_t off, size_t len); 316 extern void ceph_zero_page_vector_range(int off, int len, struct page **pages); 317 318 319 #endif /* _FS_CEPH_SUPER_H */ 320