include/linux/ceph/libceph.h

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