LXR linux/include/linux/ceph/libceph.h

   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#include <linux/ceph/string_table.h>
  25
  26/*
  27 * mount options
  28 */
  29#define CEPH_OPT_FSID             (1<<0)
  30#define CEPH_OPT_NOSHARE          (1<<1) /* don't share client with other sbs */
  31#define CEPH_OPT_MYIP             (1<<2) /* specified my ip */
  32#define CEPH_OPT_NOCRC            (1<<3) /* no data crc on writes */
  33#define CEPH_OPT_NOMSGAUTH        (1<<4) /* don't require msg signing feat */
  34#define CEPH_OPT_TCP_NODELAY      (1<<5) /* TCP_NODELAY on TCP sockets */
  35#define CEPH_OPT_NOMSGSIGN        (1<<6) /* don't sign msgs */
  36
  37#define CEPH_OPT_DEFAULT   (CEPH_OPT_TCP_NODELAY)
  38
  39#define ceph_set_opt(client, opt) \
  40        (client)->options->flags |= CEPH_OPT_##opt;
  41#define ceph_test_opt(client, opt) \
  42        (!!((client)->options->flags & CEPH_OPT_##opt))
  43
  44struct ceph_options {
  45        int flags;
  46        struct ceph_fsid fsid;
  47        struct ceph_entity_addr my_addr;
  48        unsigned long mount_timeout;            /* jiffies */
  49        unsigned long osd_idle_ttl;             /* jiffies */
  50        unsigned long osd_keepalive_timeout;    /* jiffies */
  51        unsigned long osd_request_timeout;      /* jiffies */
  52
  53        /*
  54         * any type that can't be simply compared or doesn't need need
  55         * to be compared should go beyond this point,
  56         * ceph_compare_options() should be updated accordingly
  57         */
  58
  59        struct ceph_entity_addr *mon_addr; /* should be the first
  60                                              pointer type of args */
  61        int num_mon;
  62        char *name;
  63        struct ceph_crypto_key *key;
  64};
  65
  66/*
  67 * defaults
  68 */
  69#define CEPH_MOUNT_TIMEOUT_DEFAULT      msecs_to_jiffies(60 * 1000)
  70#define CEPH_OSD_KEEPALIVE_DEFAULT      msecs_to_jiffies(5 * 1000)
  71#define CEPH_OSD_IDLE_TTL_DEFAULT       msecs_to_jiffies(60 * 1000)
  72#define CEPH_OSD_REQUEST_TIMEOUT_DEFAULT 0  /* no timeout */
  73
  74#define CEPH_MONC_HUNT_INTERVAL         msecs_to_jiffies(3 * 1000)
  75#define CEPH_MONC_PING_INTERVAL         msecs_to_jiffies(10 * 1000)
  76#define CEPH_MONC_PING_TIMEOUT          msecs_to_jiffies(30 * 1000)
  77#define CEPH_MONC_HUNT_BACKOFF          2
  78#define CEPH_MONC_HUNT_MAX_MULT         10
  79
  80#define CEPH_MSG_MAX_FRONT_LEN  (16*1024*1024)
  81#define CEPH_MSG_MAX_MIDDLE_LEN (16*1024*1024)
  82#define CEPH_MSG_MAX_DATA_LEN   (16*1024*1024)
  83
  84#define CEPH_AUTH_NAME_DEFAULT   "guest"
  85
  86/* mount state */
  87enum {
  88        CEPH_MOUNT_MOUNTING,
  89        CEPH_MOUNT_MOUNTED,
  90        CEPH_MOUNT_UNMOUNTING,
  91        CEPH_MOUNT_UNMOUNTED,
  92        CEPH_MOUNT_SHUTDOWN,
  93};
  94
  95static inline unsigned long ceph_timeout_jiffies(unsigned long timeout)
  96{
  97        return timeout ?: MAX_SCHEDULE_TIMEOUT;
  98}
  99
 100struct ceph_mds_client;
 101
 102/*
 103 * per client state
 104 *
 105 * possibly shared by multiple mount points, if they are
 106 * mounting the same ceph filesystem/cluster.
 107 */
 108struct ceph_client {
 109        struct ceph_fsid fsid;
 110        bool have_fsid;
 111
 112        void *private;
 113
 114        struct ceph_options *options;
 115
 116        struct mutex mount_mutex;      /* serialize mount attempts */
 117        wait_queue_head_t auth_wq;
 118        int auth_err;
 119
 120        int (*extra_mon_dispatch)(struct ceph_client *, struct ceph_msg *);
 121
 122        u64 supported_features;
 123        u64 required_features;
 124
 125        struct ceph_messenger msgr;   /* messenger instance */
 126        struct ceph_mon_client monc;
 127        struct ceph_osd_client osdc;
 128
 129#ifdef CONFIG_DEBUG_FS
 130        struct dentry *debugfs_dir;
 131        struct dentry *debugfs_monmap;
 132        struct dentry *debugfs_osdmap;
 133        struct dentry *debugfs_options;
 134#endif
 135};
 136
 137#define from_msgr(ms)   container_of(ms, struct ceph_client, msgr)
 138
 139
 140/*
 141 * snapshots
 142 */
 143
 144/*
 145 * A "snap context" is the set of existing snapshots when we
 146 * write data.  It is used by the OSD to guide its COW behavior.
 147 *
 148 * The ceph_snap_context is refcounted, and attached to each dirty
 149 * page, indicating which context the dirty data belonged when it was
 150 * dirtied.
 151 */
 152struct ceph_snap_context {
 153        atomic_t nref;
 154        u64 seq;
 155        u32 num_snaps;
 156        u64 snaps[];
 157};
 158
 159extern struct ceph_snap_context *ceph_create_snap_context(u32 snap_count,
 160                                        gfp_t gfp_flags);
 161extern struct ceph_snap_context *ceph_get_snap_context(
 162                                        struct ceph_snap_context *sc);
 163extern void ceph_put_snap_context(struct ceph_snap_context *sc);
 164
 165/*
 166 * calculate the number of pages a given length and offset map onto,
 167 * if we align the data.
 168 */
 169static inline int calc_pages_for(u64 off, u64 len)
 170{
 171        return ((off+len+PAGE_CACHE_SIZE-1) >> PAGE_CACHE_SHIFT) -
 172                (off >> PAGE_CACHE_SHIFT);
 173}
 174
 175#define RB_BYVAL(a)      (a)
 176#define RB_BYPTR(a)      (&(a))
 177#define RB_CMP3WAY(a, b) ((a) < (b) ? -1 : (a) > (b))
 178
 179#define DEFINE_RB_INSDEL_FUNCS2(name, type, keyfld, cmpexp, keyexp, nodefld) \
 180static void insert_##name(struct rb_root *root, type *t)                \
 181{                                                                       \
 182        struct rb_node **n = &root->rb_node;                            \
 183        struct rb_node *parent = NULL;                                  \
 184                                                                        \
 185        BUG_ON(!RB_EMPTY_NODE(&t->nodefld));                            \
 186                                                                        \
 187        while (*n) {                                                    \
 188                type *cur = rb_entry(*n, type, nodefld);                \
 189                int cmp;                                                \
 190                                                                        \
 191                parent = *n;                                            \
 192                cmp = cmpexp(keyexp(t->keyfld), keyexp(cur->keyfld));   \
 193                if (cmp < 0) {                                          \
 194                        gmb();                                          \
 195                        n = &(*n)->rb_left;                             \
 196                } else if (cmp > 0) {                                   \
 197                        gmb();                                          \
 198                        n = &(*n)->rb_right;                            \
 199                } else                                                  \
 200                        BUG();                                          \
 201        }                                                               \
 202                                                                        \
 203        rb_link_node(&t->nodefld, parent, n);                           \
 204        rb_insert_color(&t->nodefld, root);                             \
 205}                                                                       \
 206static void erase_##name(struct rb_root *root, type *t)                 \
 207{                                                                       \
 208        BUG_ON(RB_EMPTY_NODE(&t->nodefld));                             \
 209        rb_erase(&t->nodefld, root);                                    \
 210        RB_CLEAR_NODE(&t->nodefld);                                     \
 211}
 212
 213/*
 214 * @lookup_param_type is a parameter and not constructed from (@type,
 215 * @keyfld) with typeof() because adding const is too unwieldy.
 216 */
 217#define DEFINE_RB_LOOKUP_FUNC2(name, type, keyfld, cmpexp, keyexp,      \
 218                               lookup_param_type, nodefld)              \
 219static type *lookup_##name(struct rb_root *root, lookup_param_type key) \
 220{                                                                       \
 221        struct rb_node *n = root->rb_node;                              \
 222                                                                        \
 223        while (n) {                                                     \
 224                type *cur = rb_entry(n, type, nodefld);                 \
 225                int cmp;                                                \
 226                                                                        \
 227                cmp = cmpexp(key, keyexp(cur->keyfld));                 \
 228                if (cmp < 0)                                            \
 229                        n = n->rb_left;                                 \
 230                else if (cmp > 0)                                       \
 231                        n = n->rb_right;                                \
 232                else                                                    \
 233                        return cur;                                     \
 234        }                                                               \
 235                                                                        \
 236        return NULL;                                                    \
 237}
 238
 239#define DEFINE_RB_FUNCS2(name, type, keyfld, cmpexp, keyexp,            \
 240                         lookup_param_type, nodefld)                    \
 241DEFINE_RB_INSDEL_FUNCS2(name, type, keyfld, cmpexp, keyexp, nodefld)    \
 242DEFINE_RB_LOOKUP_FUNC2(name, type, keyfld, cmpexp, keyexp,              \
 243                       lookup_param_type, nodefld)
 244
 245/*
 246 * Shorthands for integer keys.
 247 */
 248#define DEFINE_RB_INSDEL_FUNCS(name, type, keyfld, nodefld)             \
 249DEFINE_RB_INSDEL_FUNCS2(name, type, keyfld, RB_CMP3WAY, RB_BYVAL, nodefld)
 250
 251#define DEFINE_RB_LOOKUP_FUNC(name, type, keyfld, nodefld)              \
 252extern type __lookup_##name##_key;                                      \
 253DEFINE_RB_LOOKUP_FUNC2(name, type, keyfld, RB_CMP3WAY, RB_BYVAL,        \
 254                       typeof(__lookup_##name##_key.keyfld), nodefld)
 255
 256#define DEFINE_RB_FUNCS(name, type, keyfld, nodefld)                    \
 257DEFINE_RB_INSDEL_FUNCS(name, type, keyfld, nodefld)                     \
 258DEFINE_RB_LOOKUP_FUNC(name, type, keyfld, nodefld)
 259
 260extern struct kmem_cache *ceph_inode_cachep;
 261extern struct kmem_cache *ceph_cap_cachep;
 262extern struct kmem_cache *ceph_cap_flush_cachep;
 263extern struct kmem_cache *ceph_dentry_cachep;
 264extern struct kmem_cache *ceph_file_cachep;
 265extern struct kmem_cache *ceph_dir_file_cachep;
 266
 267/* ceph_common.c */
 268extern bool libceph_compatible(void *data);
 269
 270extern const char *ceph_msg_type_name(int type);
 271extern int ceph_check_fsid(struct ceph_client *client, struct ceph_fsid *fsid);
 272extern void *ceph_kvmalloc(size_t size, gfp_t flags);
 273
 274extern struct ceph_options *ceph_parse_options(char *options,
 275                              const char *dev_name, const char *dev_name_end,
 276                              int (*parse_extra_token)(char *c, void *private),
 277                              void *private);
 278int ceph_print_client_options(struct seq_file *m, struct ceph_client *client);
 279extern void ceph_destroy_options(struct ceph_options *opt);
 280extern int ceph_compare_options(struct ceph_options *new_opt,
 281                                struct ceph_client *client);
 282struct ceph_client *ceph_create_client(struct ceph_options *opt, void *private);
 283struct ceph_entity_addr *ceph_client_addr(struct ceph_client *client);
 284u64 ceph_client_gid(struct ceph_client *client);
 285extern void ceph_destroy_client(struct ceph_client *client);
 286extern int __ceph_open_session(struct ceph_client *client,
 287                               unsigned long started);
 288extern int ceph_open_session(struct ceph_client *client);
 289
 290/* pagevec.c */
 291extern void ceph_release_page_vector(struct page **pages, int num_pages);
 292
 293extern struct page **ceph_get_direct_page_vector(const void __user *data,
 294                                                 int num_pages,
 295                                                 bool write_page);
 296extern void ceph_put_page_vector(struct page **pages, int num_pages,
 297                                 bool dirty);
 298extern struct page **ceph_alloc_page_vector(int num_pages, gfp_t flags);
 299extern int ceph_copy_user_to_page_vector(struct page **pages,
 300                                         const void __user *data,
 301                                         loff_t off, size_t len);
 302extern void ceph_copy_to_page_vector(struct page **pages,
 303                                    const void *data,
 304                                    loff_t off, size_t len);
 305extern void ceph_copy_from_page_vector(struct page **pages,
 306                                    void *data,
 307                                    loff_t off, size_t len);
 308extern int ceph_copy_page_vector_to_user(struct page **pages, void __user *data,
 309                                    loff_t off, size_t len);
 310extern void ceph_zero_page_vector_range(int off, int len, struct page **pages);
 311
 312
 313#endif /* _FS_CEPH_SUPER_H */
 314