fs/ceph/mds_client.h

/* [<][>][^][v][top][bottom][index][help] */
This source file includes following definitions.
ceph_get_mds_session
ceph_mdsc_get_request
ceph_mdsc_put_request
ceph_mdsc_free_path
   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 #ifndef _FS_CEPH_MDS_CLIENT_H
   3 #define _FS_CEPH_MDS_CLIENT_H
   4 
   5 #include <linux/completion.h>
   6 #include <linux/kref.h>
   7 #include <linux/list.h>
   8 #include <linux/mutex.h>
   9 #include <linux/rbtree.h>
  10 #include <linux/spinlock.h>
  11 #include <linux/refcount.h>
  12 #include <linux/utsname.h>
  13 
  14 #include <linux/ceph/types.h>
  15 #include <linux/ceph/messenger.h>
  16 #include <linux/ceph/mdsmap.h>
  17 #include <linux/ceph/auth.h>
  18 
  19 /* The first 8 bits are reserved for old ceph releases */
  20 #define CEPHFS_FEATURE_MIMIC            8
  21 #define CEPHFS_FEATURE_REPLY_ENCODING   9
  22 #define CEPHFS_FEATURE_RECLAIM_CLIENT   10
  23 #define CEPHFS_FEATURE_LAZY_CAP_WANTED  11
  24 #define CEPHFS_FEATURE_MULTI_RECONNECT  12
  25 
  26 #define CEPHFS_FEATURES_CLIENT_SUPPORTED {      \
  27         0, 1, 2, 3, 4, 5, 6, 7,                 \
  28         CEPHFS_FEATURE_MIMIC,                   \
  29         CEPHFS_FEATURE_REPLY_ENCODING,          \
  30         CEPHFS_FEATURE_LAZY_CAP_WANTED,         \
  31         CEPHFS_FEATURE_MULTI_RECONNECT,         \
  32 }
  33 #define CEPHFS_FEATURES_CLIENT_REQUIRED {}
  34 
  35 
  36 /*
  37  * Some lock dependencies:
  38  *
  39  * session->s_mutex
  40  *         mdsc->mutex
  41  *
  42  *         mdsc->snap_rwsem
  43  *
  44  *         ci->i_ceph_lock
  45  *                 mdsc->snap_flush_lock
  46  *                 mdsc->cap_delay_lock
  47  *
  48  */
  49 
  50 struct ceph_fs_client;
  51 struct ceph_cap;
  52 
  53 /*
  54  * parsed info about a single inode.  pointers are into the encoded
  55  * on-wire structures within the mds reply message payload.
  56  */
  57 struct ceph_mds_reply_info_in {
  58         struct ceph_mds_reply_inode *in;
  59         struct ceph_dir_layout dir_layout;
  60         u32 symlink_len;
  61         char *symlink;
  62         u32 xattr_len;
  63         char *xattr_data;
  64         u64 inline_version;
  65         u32 inline_len;
  66         char *inline_data;
  67         u32 pool_ns_len;
  68         char *pool_ns_data;
  69         u64 max_bytes;
  70         u64 max_files;
  71         s32 dir_pin;
  72         struct ceph_timespec btime;
  73         struct ceph_timespec snap_btime;
  74         u64 change_attr;
  75 };
  76 
  77 struct ceph_mds_reply_dir_entry {
  78         char                          *name;
  79         u32                           name_len;
  80         struct ceph_mds_reply_lease   *lease;
  81         struct ceph_mds_reply_info_in inode;
  82         loff_t                        offset;
  83 };
  84 
  85 /*
  86  * parsed info about an mds reply, including information about
  87  * either: 1) the target inode and/or its parent directory and dentry,
  88  * and directory contents (for readdir results), or
  89  * 2) the file range lock info (for fcntl F_GETLK results).
  90  */
  91 struct ceph_mds_reply_info_parsed {
  92         struct ceph_mds_reply_head    *head;
  93 
  94         /* trace */
  95         struct ceph_mds_reply_info_in diri, targeti;
  96         struct ceph_mds_reply_dirfrag *dirfrag;
  97         char                          *dname;
  98         u32                           dname_len;
  99         struct ceph_mds_reply_lease   *dlease;
 100 
 101         /* extra */
 102         union {
 103                 /* for fcntl F_GETLK results */
 104                 struct ceph_filelock *filelock_reply;
 105 
 106                 /* for readdir results */
 107                 struct {
 108                         struct ceph_mds_reply_dirfrag *dir_dir;
 109                         size_t                        dir_buf_size;
 110                         int                           dir_nr;
 111                         bool                          dir_end;
 112                         bool                          dir_complete;
 113                         bool                          hash_order;
 114                         bool                          offset_hash;
 115                         struct ceph_mds_reply_dir_entry  *dir_entries;
 116                 };
 117 
 118                 /* for create results */
 119                 struct {
 120                         bool has_create_ino;
 121                         u64 ino;
 122                 };
 123         };
 124 
 125         /* encoded blob describing snapshot contexts for certain
 126            operations (e.g., open) */
 127         void *snapblob;
 128         int snapblob_len;
 129 };
 130 
 131 
 132 /*
 133  * cap releases are batched and sent to the MDS en masse.
 134  *
 135  * Account for per-message overhead of mds_cap_release header
 136  * and __le32 for osd epoch barrier trailing field.
 137  */
 138 #define CEPH_CAPS_PER_RELEASE ((PAGE_SIZE - sizeof(u32) -               \
 139                                 sizeof(struct ceph_mds_cap_release)) /  \
 140                                 sizeof(struct ceph_mds_cap_item))
 141 
 142 
 143 /*
 144  * state associated with each MDS<->client session
 145  */
 146 enum {
 147         CEPH_MDS_SESSION_NEW = 1,
 148         CEPH_MDS_SESSION_OPENING = 2,
 149         CEPH_MDS_SESSION_OPEN = 3,
 150         CEPH_MDS_SESSION_HUNG = 4,
 151         CEPH_MDS_SESSION_RESTARTING = 5,
 152         CEPH_MDS_SESSION_RECONNECTING = 6,
 153         CEPH_MDS_SESSION_CLOSING = 7,
 154         CEPH_MDS_SESSION_REJECTED = 8,
 155 };
 156 
 157 struct ceph_mds_session {
 158         struct ceph_mds_client *s_mdsc;
 159         int               s_mds;
 160         int               s_state;
 161         unsigned long     s_ttl;      /* time until mds kills us */
 162         unsigned long     s_features;
 163         u64               s_seq;      /* incoming msg seq # */
 164         struct mutex      s_mutex;    /* serialize session messages */
 165 
 166         struct ceph_connection s_con;
 167 
 168         struct ceph_auth_handshake s_auth;
 169 
 170         /* protected by s_gen_ttl_lock */
 171         spinlock_t        s_gen_ttl_lock;
 172         u32               s_cap_gen;  /* inc each time we get mds stale msg */
 173         unsigned long     s_cap_ttl;  /* when session caps expire */
 174 
 175         /* protected by s_cap_lock */
 176         spinlock_t        s_cap_lock;
 177         struct list_head  s_caps;     /* all caps issued by this session */
 178         struct ceph_cap  *s_cap_iterator;
 179         int               s_nr_caps;
 180         int               s_num_cap_releases;
 181         int               s_cap_reconnect;
 182         int               s_readonly;
 183         struct list_head  s_cap_releases; /* waiting cap_release messages */
 184         struct work_struct s_cap_release_work;
 185 
 186         /* protected by mutex */
 187         struct list_head  s_cap_flushing;     /* inodes w/ flushing caps */
 188         unsigned long     s_renew_requested; /* last time we sent a renew req */
 189         u64               s_renew_seq;
 190 
 191         refcount_t        s_ref;
 192         struct list_head  s_waiting;  /* waiting requests */
 193         struct list_head  s_unsafe;   /* unsafe requests */
 194 };
 195 
 196 /*
 197  * modes of choosing which MDS to send a request to
 198  */
 199 enum {
 200         USE_ANY_MDS,
 201         USE_RANDOM_MDS,
 202         USE_AUTH_MDS,   /* prefer authoritative mds for this metadata item */
 203 };
 204 
 205 struct ceph_mds_request;
 206 struct ceph_mds_client;
 207 
 208 /*
 209  * request completion callback
 210  */
 211 typedef void (*ceph_mds_request_callback_t) (struct ceph_mds_client *mdsc,
 212                                              struct ceph_mds_request *req);
 213 /*
 214  * wait for request completion callback
 215  */
 216 typedef int (*ceph_mds_request_wait_callback_t) (struct ceph_mds_client *mdsc,
 217                                                  struct ceph_mds_request *req);
 218 
 219 /*
 220  * an in-flight mds request
 221  */
 222 struct ceph_mds_request {
 223         u64 r_tid;                   /* transaction id */
 224         struct rb_node r_node;
 225         struct ceph_mds_client *r_mdsc;
 226 
 227         int r_op;                    /* mds op code */
 228 
 229         /* operation on what? */
 230         struct inode *r_inode;              /* arg1 */
 231         struct dentry *r_dentry;            /* arg1 */
 232         struct dentry *r_old_dentry;        /* arg2: rename from or link from */
 233         struct inode *r_old_dentry_dir;     /* arg2: old dentry's parent dir */
 234         char *r_path1, *r_path2;
 235         struct ceph_vino r_ino1, r_ino2;
 236 
 237         struct inode *r_parent;             /* parent dir inode */
 238         struct inode *r_target_inode;       /* resulting inode */
 239 
 240 #define CEPH_MDS_R_DIRECT_IS_HASH       (1) /* r_direct_hash is valid */
 241 #define CEPH_MDS_R_ABORTED              (2) /* call was aborted */
 242 #define CEPH_MDS_R_GOT_UNSAFE           (3) /* got an unsafe reply */
 243 #define CEPH_MDS_R_GOT_SAFE             (4) /* got a safe reply */
 244 #define CEPH_MDS_R_GOT_RESULT           (5) /* got a result */
 245 #define CEPH_MDS_R_DID_PREPOPULATE      (6) /* prepopulated readdir */
 246 #define CEPH_MDS_R_PARENT_LOCKED        (7) /* is r_parent->i_rwsem wlocked? */
 247         unsigned long   r_req_flags;
 248 
 249         struct mutex r_fill_mutex;
 250 
 251         union ceph_mds_request_args r_args;
 252         int r_fmode;        /* file mode, if expecting cap */
 253         kuid_t r_uid;
 254         kgid_t r_gid;
 255         struct timespec64 r_stamp;
 256 
 257         /* for choosing which mds to send this request to */
 258         int r_direct_mode;
 259         u32 r_direct_hash;      /* choose dir frag based on this dentry hash */
 260 
 261         /* data payload is used for xattr ops */
 262         struct ceph_pagelist *r_pagelist;
 263 
 264         /* what caps shall we drop? */
 265         int r_inode_drop, r_inode_unless;
 266         int r_dentry_drop, r_dentry_unless;
 267         int r_old_dentry_drop, r_old_dentry_unless;
 268         struct inode *r_old_inode;
 269         int r_old_inode_drop, r_old_inode_unless;
 270 
 271         struct ceph_msg  *r_request;  /* original request */
 272         int r_request_release_offset;
 273         struct ceph_msg  *r_reply;
 274         struct ceph_mds_reply_info_parsed r_reply_info;
 275         struct page *r_locked_page;
 276         int r_err;
 277 
 278         unsigned long r_timeout;  /* optional.  jiffies, 0 is "wait forever" */
 279         unsigned long r_started;  /* start time to measure timeout against */
 280         unsigned long r_request_started; /* start time for mds request only,
 281                                             used to measure lease durations */
 282 
 283         /* link unsafe requests to parent directory, for fsync */
 284         struct inode    *r_unsafe_dir;
 285         struct list_head r_unsafe_dir_item;
 286 
 287         /* unsafe requests that modify the target inode */
 288         struct list_head r_unsafe_target_item;
 289 
 290         struct ceph_mds_session *r_session;
 291 
 292         int               r_attempts;   /* resend attempts */
 293         int               r_num_fwd;    /* number of forward attempts */
 294         int               r_resend_mds; /* mds to resend to next, if any*/
 295         u32               r_sent_on_mseq; /* cap mseq request was sent at*/
 296 
 297         struct kref       r_kref;
 298         struct list_head  r_wait;
 299         struct completion r_completion;
 300         struct completion r_safe_completion;
 301         ceph_mds_request_callback_t r_callback;
 302         ceph_mds_request_wait_callback_t r_wait_for_completion;
 303         struct list_head  r_unsafe_item;  /* per-session unsafe list item */
 304 
 305         long long         r_dir_release_cnt;
 306         long long         r_dir_ordered_cnt;
 307         int               r_readdir_cache_idx;
 308         u32               r_readdir_offset;
 309 
 310         struct ceph_cap_reservation r_caps_reservation;
 311         int r_num_caps;
 312 };
 313 
 314 struct ceph_pool_perm {
 315         struct rb_node node;
 316         int perm;
 317         s64 pool;
 318         size_t pool_ns_len;
 319         char pool_ns[];
 320 };
 321 
 322 struct ceph_snapid_map {
 323         struct rb_node node;
 324         struct list_head lru;
 325         atomic_t ref;
 326         u64 snap;
 327         dev_t dev;
 328         unsigned long last_used;
 329 };
 330 
 331 /*
 332  * node for list of quotarealm inodes that are not visible from the filesystem
 333  * mountpoint, but required to handle, e.g. quotas.
 334  */
 335 struct ceph_quotarealm_inode {
 336         struct rb_node node;
 337         u64 ino;
 338         unsigned long timeout; /* last time a lookup failed for this inode */
 339         struct mutex mutex;
 340         struct inode *inode;
 341 };
 342 
 343 /*
 344  * mds client state
 345  */
 346 struct ceph_mds_client {
 347         struct ceph_fs_client  *fsc;
 348         struct mutex            mutex;         /* all nested structures */
 349 
 350         struct ceph_mdsmap      *mdsmap;
 351         struct completion       safe_umount_waiters;
 352         wait_queue_head_t       session_close_wq;
 353         struct list_head        waiting_for_map;
 354         int                     mdsmap_err;
 355 
 356         struct ceph_mds_session **sessions;    /* NULL for mds if no session */
 357         atomic_t                num_sessions;
 358         int                     max_sessions;  /* len of s_mds_sessions */
 359         int                     stopping;      /* true if shutting down */
 360 
 361         atomic64_t              quotarealms_count; /* # realms with quota */
 362         /*
 363          * We keep a list of inodes we don't see in the mountpoint but that we
 364          * need to track quota realms.
 365          */
 366         struct rb_root          quotarealms_inodes;
 367         struct mutex            quotarealms_inodes_mutex;
 368 
 369         /*
 370          * snap_rwsem will cover cap linkage into snaprealms, and
 371          * realm snap contexts.  (later, we can do per-realm snap
 372          * contexts locks..)  the empty list contains realms with no
 373          * references (implying they contain no inodes with caps) that
 374          * should be destroyed.
 375          */
 376         u64                     last_snap_seq;
 377         struct rw_semaphore     snap_rwsem;
 378         struct rb_root          snap_realms;
 379         struct list_head        snap_empty;
 380         int                     num_snap_realms;
 381         spinlock_t              snap_empty_lock;  /* protect snap_empty */
 382 
 383         u64                    last_tid;      /* most recent mds request */
 384         u64                    oldest_tid;    /* oldest incomplete mds request,
 385                                                  excluding setfilelock requests */
 386         struct rb_root         request_tree;  /* pending mds requests */
 387         struct delayed_work    delayed_work;  /* delayed work */
 388         unsigned long    last_renew_caps;  /* last time we renewed our caps */
 389         struct list_head cap_delay_list;   /* caps with delayed release */
 390         spinlock_t       cap_delay_lock;   /* protects cap_delay_list */
 391         struct list_head snap_flush_list;  /* cap_snaps ready to flush */
 392         spinlock_t       snap_flush_lock;
 393 
 394         u64               last_cap_flush_tid;
 395         struct list_head  cap_flush_list;
 396         struct list_head  cap_dirty;        /* inodes with dirty caps */
 397         struct list_head  cap_dirty_migrating; /* ...that are migration... */
 398         int               num_cap_flushing; /* # caps we are flushing */
 399         spinlock_t        cap_dirty_lock;   /* protects above items */
 400         wait_queue_head_t cap_flushing_wq;
 401 
 402         struct work_struct cap_reclaim_work;
 403         atomic_t           cap_reclaim_pending;
 404 
 405         /*
 406          * Cap reservations
 407          *
 408          * Maintain a global pool of preallocated struct ceph_caps, referenced
 409          * by struct ceph_caps_reservations.  This ensures that we preallocate
 410          * memory needed to successfully process an MDS response.  (If an MDS
 411          * sends us cap information and we fail to process it, we will have
 412          * problems due to the client and MDS being out of sync.)
 413          *
 414          * Reservations are 'owned' by a ceph_cap_reservation context.
 415          */
 416         spinlock_t      caps_list_lock;
 417         struct          list_head caps_list; /* unused (reserved or
 418                                                 unreserved) */
 419         int             caps_total_count;    /* total caps allocated */
 420         int             caps_use_count;      /* in use */
 421         int             caps_use_max;        /* max used caps */
 422         int             caps_reserve_count;  /* unused, reserved */
 423         int             caps_avail_count;    /* unused, unreserved */
 424         int             caps_min_count;      /* keep at least this many
 425                                                 (unreserved) */
 426         spinlock_t        dentry_list_lock;
 427         struct list_head  dentry_leases;     /* fifo list */
 428         struct list_head  dentry_dir_leases; /* lru list */
 429 
 430         spinlock_t              snapid_map_lock;
 431         struct rb_root          snapid_map_tree;
 432         struct list_head        snapid_map_lru;
 433 
 434         struct rw_semaphore     pool_perm_rwsem;
 435         struct rb_root          pool_perm_tree;
 436 
 437         char nodename[__NEW_UTS_LEN + 1];
 438 };
 439 
 440 extern const char *ceph_mds_op_name(int op);
 441 
 442 extern struct ceph_mds_session *
 443 __ceph_lookup_mds_session(struct ceph_mds_client *, int mds);
 444 
 445 static inline struct ceph_mds_session *
 446 ceph_get_mds_session(struct ceph_mds_session *s)
 447 {
 448         refcount_inc(&s->s_ref);
 449         return s;
 450 }
 451 
 452 extern const char *ceph_session_state_name(int s);
 453 
 454 extern void ceph_put_mds_session(struct ceph_mds_session *s);
 455 
 456 extern int ceph_send_msg_mds(struct ceph_mds_client *mdsc,
 457                              struct ceph_msg *msg, int mds);
 458 
 459 extern int ceph_mdsc_init(struct ceph_fs_client *fsc);
 460 extern void ceph_mdsc_close_sessions(struct ceph_mds_client *mdsc);
 461 extern void ceph_mdsc_force_umount(struct ceph_mds_client *mdsc);
 462 extern void ceph_mdsc_destroy(struct ceph_fs_client *fsc);
 463 
 464 extern void ceph_mdsc_sync(struct ceph_mds_client *mdsc);
 465 
 466 extern void ceph_invalidate_dir_request(struct ceph_mds_request *req);
 467 extern int ceph_alloc_readdir_reply_buffer(struct ceph_mds_request *req,
 468                                            struct inode *dir);
 469 extern struct ceph_mds_request *
 470 ceph_mdsc_create_request(struct ceph_mds_client *mdsc, int op, int mode);
 471 extern int ceph_mdsc_submit_request(struct ceph_mds_client *mdsc,
 472                                     struct inode *dir,
 473                                     struct ceph_mds_request *req);
 474 extern int ceph_mdsc_do_request(struct ceph_mds_client *mdsc,
 475                                 struct inode *dir,
 476                                 struct ceph_mds_request *req);
 477 static inline void ceph_mdsc_get_request(struct ceph_mds_request *req)
 478 {
 479         kref_get(&req->r_kref);
 480 }
 481 extern void ceph_mdsc_release_request(struct kref *kref);
 482 static inline void ceph_mdsc_put_request(struct ceph_mds_request *req)
 483 {
 484         kref_put(&req->r_kref, ceph_mdsc_release_request);
 485 }
 486 
 487 extern void __ceph_queue_cap_release(struct ceph_mds_session *session,
 488                                     struct ceph_cap *cap);
 489 extern void ceph_flush_cap_releases(struct ceph_mds_client *mdsc,
 490                                     struct ceph_mds_session *session);
 491 extern void ceph_queue_cap_reclaim_work(struct ceph_mds_client *mdsc);
 492 extern void ceph_reclaim_caps_nr(struct ceph_mds_client *mdsc, int nr);
 493 extern int ceph_iterate_session_caps(struct ceph_mds_session *session,
 494                                      int (*cb)(struct inode *,
 495                                                struct ceph_cap *, void *),
 496                                      void *arg);
 497 extern void ceph_mdsc_pre_umount(struct ceph_mds_client *mdsc);
 498 
 499 static inline void ceph_mdsc_free_path(char *path, int len)
 500 {
 501         if (path)
 502                 __putname(path - (PATH_MAX - 1 - len));
 503 }
 504 
 505 extern char *ceph_mdsc_build_path(struct dentry *dentry, int *plen, u64 *base,
 506                                   int stop_on_nosnap);
 507 
 508 extern void __ceph_mdsc_drop_dentry_lease(struct dentry *dentry);
 509 extern void ceph_mdsc_lease_send_msg(struct ceph_mds_session *session,
 510                                      struct dentry *dentry, char action,
 511                                      u32 seq);
 512 
 513 extern void ceph_mdsc_handle_mdsmap(struct ceph_mds_client *mdsc,
 514                                     struct ceph_msg *msg);
 515 extern void ceph_mdsc_handle_fsmap(struct ceph_mds_client *mdsc,
 516                                    struct ceph_msg *msg);
 517 
 518 extern struct ceph_mds_session *
 519 ceph_mdsc_open_export_target_session(struct ceph_mds_client *mdsc, int target);
 520 extern void ceph_mdsc_open_export_target_sessions(struct ceph_mds_client *mdsc,
 521                                           struct ceph_mds_session *session);
 522 
 523 extern int ceph_trim_caps(struct ceph_mds_client *mdsc,
 524                           struct ceph_mds_session *session,
 525                           int max_caps);
 526 #endif
/* [<][>][^][v][top][bottom][index][help] */
root/fs/ceph/mds_client.h

INCLUDED FROM

DEFINITIONS
