1 #ifndef _FS_CEPH_SUPER_H 2 #define _FS_CEPH_SUPER_H 3 4 #include "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/fs.h> 11 #include <linux/mempool.h> 12 #include <linux/pagemap.h> 13 #include <linux/wait.h> 14 #include <linux/writeback.h> 15 #include <linux/slab.h> 16 17 #include "types.h" 18 #include "messenger.h" 19 #include "msgpool.h" 20 #include "mon_client.h" 21 #include "mds_client.h" 22 #include "osd_client.h" 23 #include "ceph_fs.h" 24 25 /* f_type in struct statfs */ 26 #define CEPH_SUPER_MAGIC 0x00c36400 27 28 /* large granularity for statfs utilization stats to facilitate 29 * large volume sizes on 32-bit machines. */ 30 #define CEPH_BLOCK_SHIFT 20 /* 1 MB */ 31 #define CEPH_BLOCK (1 << CEPH_BLOCK_SHIFT) 32 33 /* 34 * mount options 35 */ 36 #define CEPH_OPT_FSID (1<<0) 37 #define CEPH_OPT_NOSHARE (1<<1) /* don't share client with other sbs */ 38 #define CEPH_OPT_MYIP (1<<2) /* specified my ip */ 39 #define CEPH_OPT_DIRSTAT (1<<4) /* funky `cat dirname` for stats */ 40 #define CEPH_OPT_RBYTES (1<<5) /* dir st_bytes = rbytes */ 41 #define CEPH_OPT_NOCRC (1<<6) /* no data crc on writes */ 42 #define CEPH_OPT_NOASYNCREADDIR (1<<7) /* no dcache readdir */ 43 44 #define CEPH_OPT_DEFAULT (CEPH_OPT_RBYTES) 45 46 #define ceph_set_opt(client, opt) \ 47 (client)->mount_args->flags |= CEPH_OPT_##opt; 48 #define ceph_test_opt(client, opt) \ 49 (!!((client)->mount_args->flags & CEPH_OPT_##opt)) 50 51 52 struct ceph_mount_args { 53 int sb_flags; 54 int flags; 55 struct ceph_fsid fsid; 56 struct ceph_entity_addr my_addr; 57 int num_mon; 58 struct ceph_entity_addr *mon_addr; 59 int mount_timeout; 60 int osd_idle_ttl; 61 int osd_timeout; 62 int osd_keepalive_timeout; 63 int wsize; 64 int rsize; /* max readahead */ 65 int congestion_kb; /* max writeback in flight */ 66 int caps_wanted_delay_min, caps_wanted_delay_max; 67 int cap_release_safety; 68 int max_readdir; /* max readdir result (entires) */ 69 int max_readdir_bytes; /* max readdir result (bytes) */ 70 char *snapdir_name; /* default ".snap" */ 71 char *name; 72 char *secret; 73 }; 74 75 /* 76 * defaults 77 */ 78 #define CEPH_MOUNT_TIMEOUT_DEFAULT 60 79 #define CEPH_OSD_TIMEOUT_DEFAULT 60 /* seconds */ 80 #define CEPH_OSD_KEEPALIVE_DEFAULT 5 81 #define CEPH_OSD_IDLE_TTL_DEFAULT 60 82 #define CEPH_MOUNT_RSIZE_DEFAULT (512*1024) /* readahead */ 83 #define CEPH_MAX_READDIR_DEFAULT 1024 84 #define CEPH_MAX_READDIR_BYTES_DEFAULT (512*1024) 85 86 #define CEPH_MSG_MAX_FRONT_LEN (16*1024*1024) 87 #define CEPH_MSG_MAX_DATA_LEN (16*1024*1024) 88 89 #define CEPH_SNAPDIRNAME_DEFAULT ".snap" 90 #define CEPH_AUTH_NAME_DEFAULT "guest" 91 /* 92 * Delay telling the MDS we no longer want caps, in case we reopen 93 * the file. Delay a minimum amount of time, even if we send a cap 94 * message for some other reason. Otherwise, take the oppotunity to 95 * update the mds to avoid sending another message later. 96 */ 97 #define CEPH_CAPS_WANTED_DELAY_MIN_DEFAULT 5 /* cap release delay */ 98 #define CEPH_CAPS_WANTED_DELAY_MAX_DEFAULT 60 /* cap release delay */ 99 100 #define CEPH_CAP_RELEASE_SAFETY_DEFAULT (CEPH_CAPS_PER_RELEASE * 4) 101 102 /* mount state */ 103 enum { 104 CEPH_MOUNT_MOUNTING, 105 CEPH_MOUNT_MOUNTED, 106 CEPH_MOUNT_UNMOUNTING, 107 CEPH_MOUNT_UNMOUNTED, 108 CEPH_MOUNT_SHUTDOWN, 109 }; 110 111 /* 112 * subtract jiffies 113 */ 114 static inline unsigned long time_sub(unsigned long a, unsigned long b) 115 { 116 BUG_ON(time_after(b, a)); 117 return (long)a - (long)b; 118 } 119 120 /* 121 * per-filesystem client state 122 * 123 * possibly shared by multiple mount points, if they are 124 * mounting the same ceph filesystem/cluster. 125 */ 126 struct ceph_client { 127 struct ceph_fsid fsid; 128 bool have_fsid; 129 130 struct mutex mount_mutex; /* serialize mount attempts */ 131 struct ceph_mount_args *mount_args; 132 133 struct super_block *sb; 134 135 unsigned long mount_state; 136 wait_queue_head_t auth_wq; 137 138 int auth_err; 139 140 int min_caps; /* min caps i added */ 141 142 struct ceph_messenger *msgr; /* messenger instance */ 143 struct ceph_mon_client monc; 144 struct ceph_mds_client mdsc; 145 struct ceph_osd_client osdc; 146 147 /* writeback */ 148 mempool_t *wb_pagevec_pool; 149 struct workqueue_struct *wb_wq; 150 struct workqueue_struct *pg_inv_wq; 151 struct workqueue_struct *trunc_wq; 152 atomic_long_t writeback_count; 153 154 struct backing_dev_info backing_dev_info; 155 156 #ifdef CONFIG_DEBUG_FS 157 struct dentry *debugfs_monmap; 158 struct dentry *debugfs_mdsmap, *debugfs_osdmap; 159 struct dentry *debugfs_dir, *debugfs_dentry_lru, *debugfs_caps; 160 struct dentry *debugfs_congestion_kb; 161 struct dentry *debugfs_bdi; 162 #endif 163 }; 164 165 /* 166 * File i/o capability. This tracks shared state with the metadata 167 * server that allows us to cache or writeback attributes or to read 168 * and write data. For any given inode, we should have one or more 169 * capabilities, one issued by each metadata server, and our 170 * cumulative access is the OR of all issued capabilities. 171 * 172 * Each cap is referenced by the inode's i_caps rbtree and by per-mds 173 * session capability lists. 174 */ 175 struct ceph_cap { 176 struct ceph_inode_info *ci; 177 struct rb_node ci_node; /* per-ci cap tree */ 178 struct ceph_mds_session *session; 179 struct list_head session_caps; /* per-session caplist */ 180 int mds; 181 u64 cap_id; /* unique cap id (mds provided) */ 182 int issued; /* latest, from the mds */ 183 int implemented; /* implemented superset of issued (for revocation) */ 184 int mds_wanted; 185 u32 seq, issue_seq, mseq; 186 u32 cap_gen; /* active/stale cycle */ 187 unsigned long last_used; 188 struct list_head caps_item; 189 }; 190 191 #define CHECK_CAPS_NODELAY 1 /* do not delay any further */ 192 #define CHECK_CAPS_AUTHONLY 2 /* only check auth cap */ 193 #define CHECK_CAPS_FLUSH 4 /* flush any dirty caps */ 194 195 /* 196 * Snapped cap state that is pending flush to mds. When a snapshot occurs, 197 * we first complete any in-process sync writes and writeback any dirty 198 * data before flushing the snapped state (tracked here) back to the MDS. 199 */ 200 struct ceph_cap_snap { 201 atomic_t nref; 202 struct ceph_inode_info *ci; 203 struct list_head ci_item, flushing_item; 204 205 u64 follows, flush_tid; 206 int issued, dirty; 207 struct ceph_snap_context *context; 208 209 mode_t mode; 210 uid_t uid; 211 gid_t gid; 212 213 void *xattr_blob; 214 int xattr_len; 215 u64 xattr_version; 216 217 u64 size; 218 struct timespec mtime, atime, ctime; 219 u64 time_warp_seq; 220 int writing; /* a sync write is still in progress */ 221 int dirty_pages; /* dirty pages awaiting writeback */ 222 }; 223 224 static inline void ceph_put_cap_snap(struct ceph_cap_snap *capsnap) 225 { 226 if (atomic_dec_and_test(&capsnap->nref)) 227 kfree(capsnap); 228 } 229 230 /* 231 * The frag tree describes how a directory is fragmented, potentially across 232 * multiple metadata servers. It is also used to indicate points where 233 * metadata authority is delegated, and whether/where metadata is replicated. 234 * 235 * A _leaf_ frag will be present in the i_fragtree IFF there is 236 * delegation info. That is, if mds >= 0 || ndist > 0. 237 */ 238 #define CEPH_MAX_DIRFRAG_REP 4 239 240 struct ceph_inode_frag { 241 struct rb_node node; 242 243 /* fragtree state */ 244 u32 frag; 245 int split_by; /* i.e. 2^(split_by) children */ 246 247 /* delegation and replication info */ 248 int mds; /* -1 if same authority as parent */ 249 int ndist; /* >0 if replicated */ 250 int dist[CEPH_MAX_DIRFRAG_REP]; 251 }; 252 253 /* 254 * We cache inode xattrs as an encoded blob until they are first used, 255 * at which point we parse them into an rbtree. 256 */ 257 struct ceph_inode_xattr { 258 struct rb_node node; 259 260 const char *name; 261 int name_len; 262 const char *val; 263 int val_len; 264 int dirty; 265 266 int should_free_name; 267 int should_free_val; 268 }; 269 270 struct ceph_inode_xattrs_info { 271 /* 272 * (still encoded) xattr blob. we avoid the overhead of parsing 273 * this until someone actually calls getxattr, etc. 274 * 275 * blob->vec.iov_len == 4 implies there are no xattrs; blob == 276 * NULL means we don't know. 277 */ 278 struct ceph_buffer *blob, *prealloc_blob; 279 280 struct rb_root index; 281 bool dirty; 282 int count; 283 int names_size; 284 int vals_size; 285 u64 version, index_version; 286 }; 287 288 /* 289 * Ceph inode. 290 */ 291 #define CEPH_I_COMPLETE 1 /* we have complete directory cached */ 292 #define CEPH_I_NODELAY 4 /* do not delay cap release */ 293 #define CEPH_I_FLUSH 8 /* do not delay flush of dirty metadata */ 294 #define CEPH_I_NOFLUSH 16 /* do not flush dirty caps */ 295 296 struct ceph_inode_info { 297 struct ceph_vino i_vino; /* ceph ino + snap */ 298 299 u64 i_version; 300 u32 i_time_warp_seq; 301 302 unsigned i_ceph_flags; 303 unsigned long i_release_count; 304 305 struct ceph_file_layout i_layout; 306 char *i_symlink; 307 308 /* for dirs */ 309 struct timespec i_rctime; 310 u64 i_rbytes, i_rfiles, i_rsubdirs; 311 u64 i_files, i_subdirs; 312 u64 i_max_offset; /* largest readdir offset, set with I_COMPLETE */ 313 314 struct rb_root i_fragtree; 315 struct mutex i_fragtree_mutex; 316 317 struct ceph_inode_xattrs_info i_xattrs; 318 319 /* capabilities. protected _both_ by i_lock and cap->session's 320 * s_mutex. */ 321 struct rb_root i_caps; /* cap list */ 322 struct ceph_cap *i_auth_cap; /* authoritative cap, if any */ 323 unsigned i_dirty_caps, i_flushing_caps; /* mask of dirtied fields */ 324 struct list_head i_dirty_item, i_flushing_item; 325 u64 i_cap_flush_seq; 326 /* we need to track cap writeback on a per-cap-bit basis, to allow 327 * overlapping, pipelined cap flushes to the mds. we can probably 328 * reduce the tid to 8 bits if we're concerned about inode size. */ 329 u16 i_cap_flush_last_tid, i_cap_flush_tid[CEPH_CAP_BITS]; 330 wait_queue_head_t i_cap_wq; /* threads waiting on a capability */ 331 unsigned long i_hold_caps_min; /* jiffies */ 332 unsigned long i_hold_caps_max; /* jiffies */ 333 struct list_head i_cap_delay_list; /* for delayed cap release to mds */ 334 int i_cap_exporting_mds; /* to handle cap migration between */ 335 unsigned i_cap_exporting_mseq; /* mds's. */ 336 unsigned i_cap_exporting_issued; 337 struct ceph_cap_reservation i_cap_migration_resv; 338 struct list_head i_cap_snaps; /* snapped state pending flush to mds */ 339 struct ceph_snap_context *i_head_snapc; /* set if wr_buffer_head > 0 */ 340 unsigned i_snap_caps; /* cap bits for snapped files */ 341 342 int i_nr_by_mode[CEPH_FILE_MODE_NUM]; /* open file counts */ 343 344 u32 i_truncate_seq; /* last truncate to smaller size */ 345 u64 i_truncate_size; /* and the size we last truncated down to */ 346 int i_truncate_pending; /* still need to call vmtruncate */ 347 348 u64 i_max_size; /* max file size authorized by mds */ 349 u64 i_reported_size; /* (max_)size reported to or requested of mds */ 350 u64 i_wanted_max_size; /* offset we'd like to write too */ 351 u64 i_requested_max_size; /* max_size we've requested */ 352 353 /* held references to caps */ 354 int i_pin_ref; 355 int i_rd_ref, i_rdcache_ref, i_wr_ref; 356 int i_wrbuffer_ref, i_wrbuffer_ref_head; 357 u32 i_shared_gen; /* increment each time we get FILE_SHARED */ 358 u32 i_rdcache_gen; /* we increment this each time we get 359 FILE_CACHE. If it's non-zero, we 360 _may_ have cached pages. */ 361 u32 i_rdcache_revoking; /* RDCACHE gen to async invalidate, if any */ 362 363 struct list_head i_unsafe_writes; /* uncommitted sync writes */ 364 struct list_head i_unsafe_dirops; /* uncommitted mds dir ops */ 365 spinlock_t i_unsafe_lock; 366 367 struct ceph_snap_realm *i_snap_realm; /* snap realm (if caps) */ 368 int i_snap_realm_counter; /* snap realm (if caps) */ 369 struct list_head i_snap_realm_item; 370 struct list_head i_snap_flush_item; 371 372 struct work_struct i_wb_work; /* writeback work */ 373 struct work_struct i_pg_inv_work; /* page invalidation work */ 374 375 struct work_struct i_vmtruncate_work; 376 377 struct inode vfs_inode; /* at end */ 378 }; 379 380 static inline struct ceph_inode_info *ceph_inode(struct inode *inode) 381 { 382 return container_of(inode, struct ceph_inode_info, vfs_inode); 383 } 384 385 static inline void ceph_i_clear(struct inode *inode, unsigned mask) 386 { 387 struct ceph_inode_info *ci = ceph_inode(inode); 388 389 spin_lock(&inode->i_lock); 390 ci->i_ceph_flags &= ~mask; 391 spin_unlock(&inode->i_lock); 392 } 393 394 static inline void ceph_i_set(struct inode *inode, unsigned mask) 395 { 396 struct ceph_inode_info *ci = ceph_inode(inode); 397 398 spin_lock(&inode->i_lock); 399 ci->i_ceph_flags |= mask; 400 spin_unlock(&inode->i_lock); 401 } 402 403 static inline bool ceph_i_test(struct inode *inode, unsigned mask) 404 { 405 struct ceph_inode_info *ci = ceph_inode(inode); 406 bool r; 407 408 smp_mb(); 409 r = (ci->i_ceph_flags & mask) == mask; 410 return r; 411 } 412 413 414 /* find a specific frag @f */ 415 extern struct ceph_inode_frag *__ceph_find_frag(struct ceph_inode_info *ci, 416 u32 f); 417 418 /* 419 * choose fragment for value @v. copy frag content to pfrag, if leaf 420 * exists 421 */ 422 extern u32 ceph_choose_frag(struct ceph_inode_info *ci, u32 v, 423 struct ceph_inode_frag *pfrag, 424 int *found); 425 426 /* 427 * Ceph dentry state 428 */ 429 struct ceph_dentry_info { 430 struct ceph_mds_session *lease_session; 431 u32 lease_gen, lease_shared_gen; 432 u32 lease_seq; 433 unsigned long lease_renew_after, lease_renew_from; 434 struct list_head lru; 435 struct dentry *dentry; 436 u64 time; 437 u64 offset; 438 }; 439 440 static inline struct ceph_dentry_info *ceph_dentry(struct dentry *dentry) 441 { 442 return (struct ceph_dentry_info *)dentry->d_fsdata; 443 } 444 445 static inline loff_t ceph_make_fpos(unsigned frag, unsigned off) 446 { 447 return ((loff_t)frag << 32) | (loff_t)off; 448 } 449 450 /* 451 * ino_t is <64 bits on many architectures, blech. 452 * 453 * don't include snap in ino hash, at least for now. 454 */ 455 static inline ino_t ceph_vino_to_ino(struct ceph_vino vino) 456 { 457 ino_t ino = (ino_t)vino.ino; /* ^ (vino.snap << 20); */ 458 #if BITS_PER_LONG == 32 459 ino ^= vino.ino >> (sizeof(u64)-sizeof(ino_t)) * 8; 460 if (!ino) 461 ino = 1; 462 #endif 463 return ino; 464 } 465 466 static inline int ceph_set_ino_cb(struct inode *inode, void *data) 467 { 468 ceph_inode(inode)->i_vino = *(struct ceph_vino *)data; 469 inode->i_ino = ceph_vino_to_ino(*(struct ceph_vino *)data); 470 return 0; 471 } 472 473 static inline struct ceph_vino ceph_vino(struct inode *inode) 474 { 475 return ceph_inode(inode)->i_vino; 476 } 477 478 /* for printf-style formatting */ 479 #define ceph_vinop(i) ceph_inode(i)->i_vino.ino, ceph_inode(i)->i_vino.snap 480 481 static inline u64 ceph_ino(struct inode *inode) 482 { 483 return ceph_inode(inode)->i_vino.ino; 484 } 485 static inline u64 ceph_snap(struct inode *inode) 486 { 487 return ceph_inode(inode)->i_vino.snap; 488 } 489 490 static inline int ceph_ino_compare(struct inode *inode, void *data) 491 { 492 struct ceph_vino *pvino = (struct ceph_vino *)data; 493 struct ceph_inode_info *ci = ceph_inode(inode); 494 return ci->i_vino.ino == pvino->ino && 495 ci->i_vino.snap == pvino->snap; 496 } 497 498 static inline struct inode *ceph_find_inode(struct super_block *sb, 499 struct ceph_vino vino) 500 { 501 ino_t t = ceph_vino_to_ino(vino); 502 return ilookup5(sb, t, ceph_ino_compare, &vino); 503 } 504 505 506 /* 507 * caps helpers 508 */ 509 static inline bool __ceph_is_any_real_caps(struct ceph_inode_info *ci) 510 { 511 return !RB_EMPTY_ROOT(&ci->i_caps); 512 } 513 514 extern int __ceph_caps_issued(struct ceph_inode_info *ci, int *implemented); 515 extern int __ceph_caps_issued_mask(struct ceph_inode_info *ci, int mask, int t); 516 extern int __ceph_caps_issued_other(struct ceph_inode_info *ci, 517 struct ceph_cap *cap); 518 519 static inline int ceph_caps_issued(struct ceph_inode_info *ci) 520 { 521 int issued; 522 spin_lock(&ci->vfs_inode.i_lock); 523 issued = __ceph_caps_issued(ci, NULL); 524 spin_unlock(&ci->vfs_inode.i_lock); 525 return issued; 526 } 527 528 static inline int ceph_caps_issued_mask(struct ceph_inode_info *ci, int mask, 529 int touch) 530 { 531 int r; 532 spin_lock(&ci->vfs_inode.i_lock); 533 r = __ceph_caps_issued_mask(ci, mask, touch); 534 spin_unlock(&ci->vfs_inode.i_lock); 535 return r; 536 } 537 538 static inline int __ceph_caps_dirty(struct ceph_inode_info *ci) 539 { 540 return ci->i_dirty_caps | ci->i_flushing_caps; 541 } 542 extern void __ceph_mark_dirty_caps(struct ceph_inode_info *ci, int mask); 543 544 extern int ceph_caps_revoking(struct ceph_inode_info *ci, int mask); 545 extern int __ceph_caps_used(struct ceph_inode_info *ci); 546 547 extern int __ceph_caps_file_wanted(struct ceph_inode_info *ci); 548 549 /* 550 * wanted, by virtue of open file modes AND cap refs (buffered/cached data) 551 */ 552 static inline int __ceph_caps_wanted(struct ceph_inode_info *ci) 553 { 554 int w = __ceph_caps_file_wanted(ci) | __ceph_caps_used(ci); 555 if (w & CEPH_CAP_FILE_BUFFER) 556 w |= CEPH_CAP_FILE_EXCL; /* we want EXCL if dirty data */ 557 return w; 558 } 559 560 /* what the mds thinks we want */ 561 extern int __ceph_caps_mds_wanted(struct ceph_inode_info *ci); 562 563 extern void ceph_caps_init(void); 564 extern void ceph_caps_finalize(void); 565 extern void ceph_adjust_min_caps(int delta); 566 extern int ceph_reserve_caps(struct ceph_cap_reservation *ctx, int need); 567 extern int ceph_unreserve_caps(struct ceph_cap_reservation *ctx); 568 extern void ceph_reservation_status(struct ceph_client *client, 569 int *total, int *avail, int *used, 570 int *reserved, int *min); 571 572 static inline struct ceph_client *ceph_inode_to_client(struct inode *inode) 573 { 574 return (struct ceph_client *)inode->i_sb->s_fs_info; 575 } 576 577 static inline struct ceph_client *ceph_sb_to_client(struct super_block *sb) 578 { 579 return (struct ceph_client *)sb->s_fs_info; 580 } 581 582 583 /* 584 * we keep buffered readdir results attached to file->private_data 585 */ 586 struct ceph_file_info { 587 int fmode; /* initialized on open */ 588 589 /* readdir: position within the dir */ 590 u32 frag; 591 struct ceph_mds_request *last_readdir; 592 int at_end; 593 594 /* readdir: position within a frag */ 595 unsigned offset; /* offset of last chunk, adjusted for . and .. */ 596 u64 next_offset; /* offset of next chunk (last_name's + 1) */ 597 char *last_name; /* last entry in previous chunk */ 598 struct dentry *dentry; /* next dentry (for dcache readdir) */ 599 unsigned long dir_release_count; 600 601 /* used for -o dirstat read() on directory thing */ 602 char *dir_info; 603 int dir_info_len; 604 }; 605 606 607 608 /* 609 * snapshots 610 */ 611 612 /* 613 * A "snap context" is the set of existing snapshots when we 614 * write data. It is used by the OSD to guide its COW behavior. 615 * 616 * The ceph_snap_context is refcounted, and attached to each dirty 617 * page, indicating which context the dirty data belonged when it was 618 * dirtied. 619 */ 620 struct ceph_snap_context { 621 atomic_t nref; 622 u64 seq; 623 int num_snaps; 624 u64 snaps[]; 625 }; 626 627 static inline struct ceph_snap_context * 628 ceph_get_snap_context(struct ceph_snap_context *sc) 629 { 630 /* 631 printk("get_snap_context %p %d -> %d\n", sc, atomic_read(&sc->nref), 632 atomic_read(&sc->nref)+1); 633 */ 634 if (sc) 635 atomic_inc(&sc->nref); 636 return sc; 637 } 638 639 static inline void ceph_put_snap_context(struct ceph_snap_context *sc) 640 { 641 if (!sc) 642 return; 643 /* 644 printk("put_snap_context %p %d -> %d\n", sc, atomic_read(&sc->nref), 645 atomic_read(&sc->nref)-1); 646 */ 647 if (atomic_dec_and_test(&sc->nref)) { 648 /*printk(" deleting snap_context %p\n", sc);*/ 649 kfree(sc); 650 } 651 } 652 653 /* 654 * A "snap realm" describes a subset of the file hierarchy sharing 655 * the same set of snapshots that apply to it. The realms themselves 656 * are organized into a hierarchy, such that children inherit (some of) 657 * the snapshots of their parents. 658 * 659 * All inodes within the realm that have capabilities are linked into a 660 * per-realm list. 661 */ 662 struct ceph_snap_realm { 663 u64 ino; 664 atomic_t nref; 665 struct rb_node node; 666 667 u64 created, seq; 668 u64 parent_ino; 669 u64 parent_since; /* snapid when our current parent became so */ 670 671 u64 *prior_parent_snaps; /* snaps inherited from any parents we */ 672 int num_prior_parent_snaps; /* had prior to parent_since */ 673 u64 *snaps; /* snaps specific to this realm */ 674 int num_snaps; 675 676 struct ceph_snap_realm *parent; 677 struct list_head children; /* list of child realms */ 678 struct list_head child_item; 679 680 struct list_head empty_item; /* if i have ref==0 */ 681 682 /* the current set of snaps for this realm */ 683 struct ceph_snap_context *cached_context; 684 685 struct list_head inodes_with_caps; 686 spinlock_t inodes_with_caps_lock; 687 }; 688 689 690 691 /* 692 * calculate the number of pages a given length and offset map onto, 693 * if we align the data. 694 */ 695 static inline int calc_pages_for(u64 off, u64 len) 696 { 697 return ((off+len+PAGE_CACHE_SIZE-1) >> PAGE_CACHE_SHIFT) - 698 (off >> PAGE_CACHE_SHIFT); 699 } 700 701 702 703 /* snap.c */ 704 struct ceph_snap_realm *ceph_lookup_snap_realm(struct ceph_mds_client *mdsc, 705 u64 ino); 706 extern void ceph_get_snap_realm(struct ceph_mds_client *mdsc, 707 struct ceph_snap_realm *realm); 708 extern void ceph_put_snap_realm(struct ceph_mds_client *mdsc, 709 struct ceph_snap_realm *realm); 710 extern int ceph_update_snap_trace(struct ceph_mds_client *m, 711 void *p, void *e, bool deletion); 712 extern void ceph_handle_snap(struct ceph_mds_client *mdsc, 713 struct ceph_mds_session *session, 714 struct ceph_msg *msg); 715 extern void ceph_queue_cap_snap(struct ceph_inode_info *ci); 716 extern int __ceph_finish_cap_snap(struct ceph_inode_info *ci, 717 struct ceph_cap_snap *capsnap); 718 extern void ceph_cleanup_empty_realms(struct ceph_mds_client *mdsc); 719 720 /* 721 * a cap_snap is "pending" if it is still awaiting an in-progress 722 * sync write (that may/may not still update size, mtime, etc.). 723 */ 724 static inline bool __ceph_have_pending_cap_snap(struct ceph_inode_info *ci) 725 { 726 return !list_empty(&ci->i_cap_snaps) && 727 list_entry(ci->i_cap_snaps.prev, struct ceph_cap_snap, 728 ci_item)->writing; 729 } 730 731 732 /* super.c */ 733 extern struct kmem_cache *ceph_inode_cachep; 734 extern struct kmem_cache *ceph_cap_cachep; 735 extern struct kmem_cache *ceph_dentry_cachep; 736 extern struct kmem_cache *ceph_file_cachep; 737 738 extern const char *ceph_msg_type_name(int type); 739 extern int ceph_check_fsid(struct ceph_client *client, struct ceph_fsid *fsid); 740 741 #define FSID_FORMAT "%02x%02x%02x%02x-%02x%02x-%02x%02x-%02x%02x-" \ 742 "%02x%02x%02x%02x%02x%02x" 743 #define PR_FSID(f) (f)->fsid[0], (f)->fsid[1], (f)->fsid[2], (f)->fsid[3], \ 744 (f)->fsid[4], (f)->fsid[5], (f)->fsid[6], (f)->fsid[7], \ 745 (f)->fsid[8], (f)->fsid[9], (f)->fsid[10], (f)->fsid[11], \ 746 (f)->fsid[12], (f)->fsid[13], (f)->fsid[14], (f)->fsid[15] 747 748 /* inode.c */ 749 extern const struct inode_operations ceph_file_iops; 750 751 extern struct inode *ceph_alloc_inode(struct super_block *sb); 752 extern void ceph_destroy_inode(struct inode *inode); 753 754 extern struct inode *ceph_get_inode(struct super_block *sb, 755 struct ceph_vino vino); 756 extern struct inode *ceph_get_snapdir(struct inode *parent); 757 extern int ceph_fill_file_size(struct inode *inode, int issued, 758 u32 truncate_seq, u64 truncate_size, u64 size); 759 extern void ceph_fill_file_time(struct inode *inode, int issued, 760 u64 time_warp_seq, struct timespec *ctime, 761 struct timespec *mtime, struct timespec *atime); 762 extern int ceph_fill_trace(struct super_block *sb, 763 struct ceph_mds_request *req, 764 struct ceph_mds_session *session); 765 extern int ceph_readdir_prepopulate(struct ceph_mds_request *req, 766 struct ceph_mds_session *session); 767 768 extern int ceph_inode_holds_cap(struct inode *inode, int mask); 769 770 extern int ceph_inode_set_size(struct inode *inode, loff_t size); 771 extern void __ceph_do_pending_vmtruncate(struct inode *inode); 772 extern void ceph_queue_vmtruncate(struct inode *inode); 773 774 extern void ceph_queue_invalidate(struct inode *inode); 775 extern void ceph_queue_writeback(struct inode *inode); 776 777 extern int ceph_do_getattr(struct inode *inode, int mask); 778 extern int ceph_permission(struct inode *inode, int mask); 779 extern int ceph_setattr(struct dentry *dentry, struct iattr *attr); 780 extern int ceph_getattr(struct vfsmount *mnt, struct dentry *dentry, 781 struct kstat *stat); 782 783 /* xattr.c */ 784 extern int ceph_setxattr(struct dentry *, const char *, const void *, 785 size_t, int); 786 extern ssize_t ceph_getxattr(struct dentry *, const char *, void *, size_t); 787 extern ssize_t ceph_listxattr(struct dentry *, char *, size_t); 788 extern int ceph_removexattr(struct dentry *, const char *); 789 extern void __ceph_build_xattrs_blob(struct ceph_inode_info *ci); 790 extern void __ceph_destroy_xattrs(struct ceph_inode_info *ci); 791 792 /* caps.c */ 793 extern const char *ceph_cap_string(int c); 794 extern void ceph_handle_caps(struct ceph_mds_session *session, 795 struct ceph_msg *msg); 796 extern int ceph_add_cap(struct inode *inode, 797 struct ceph_mds_session *session, u64 cap_id, 798 int fmode, unsigned issued, unsigned wanted, 799 unsigned cap, unsigned seq, u64 realmino, int flags, 800 struct ceph_cap_reservation *caps_reservation); 801 extern void __ceph_remove_cap(struct ceph_cap *cap); 802 static inline void ceph_remove_cap(struct ceph_cap *cap) 803 { 804 struct inode *inode = &cap->ci->vfs_inode; 805 spin_lock(&inode->i_lock); 806 __ceph_remove_cap(cap); 807 spin_unlock(&inode->i_lock); 808 } 809 extern void ceph_put_cap(struct ceph_cap *cap); 810 811 extern void ceph_queue_caps_release(struct inode *inode); 812 extern int ceph_write_inode(struct inode *inode, struct writeback_control *wbc); 813 extern int ceph_fsync(struct file *file, int datasync); 814 extern void ceph_kick_flushing_caps(struct ceph_mds_client *mdsc, 815 struct ceph_mds_session *session); 816 extern int ceph_get_cap_mds(struct inode *inode); 817 extern void ceph_get_cap_refs(struct ceph_inode_info *ci, int caps); 818 extern void ceph_put_cap_refs(struct ceph_inode_info *ci, int had); 819 extern void ceph_put_wrbuffer_cap_refs(struct ceph_inode_info *ci, int nr, 820 struct ceph_snap_context *snapc); 821 extern void __ceph_flush_snaps(struct ceph_inode_info *ci, 822 struct ceph_mds_session **psession); 823 extern void ceph_check_caps(struct ceph_inode_info *ci, int flags, 824 struct ceph_mds_session *session); 825 extern void ceph_check_delayed_caps(struct ceph_mds_client *mdsc); 826 extern void ceph_flush_dirty_caps(struct ceph_mds_client *mdsc); 827 828 extern int ceph_encode_inode_release(void **p, struct inode *inode, 829 int mds, int drop, int unless, int force); 830 extern int ceph_encode_dentry_release(void **p, struct dentry *dn, 831 int mds, int drop, int unless); 832 833 extern int ceph_get_caps(struct ceph_inode_info *ci, int need, int want, 834 int *got, loff_t endoff); 835 836 /* for counting open files by mode */ 837 static inline void __ceph_get_fmode(struct ceph_inode_info *ci, int mode) 838 { 839 ci->i_nr_by_mode[mode]++; 840 } 841 extern void ceph_put_fmode(struct ceph_inode_info *ci, int mode); 842 843 /* addr.c */ 844 extern const struct address_space_operations ceph_aops; 845 extern int ceph_mmap(struct file *file, struct vm_area_struct *vma); 846 847 /* file.c */ 848 extern const struct file_operations ceph_file_fops; 849 extern const struct address_space_operations ceph_aops; 850 extern int ceph_open(struct inode *inode, struct file *file); 851 extern struct dentry *ceph_lookup_open(struct inode *dir, struct dentry *dentry, 852 struct nameidata *nd, int mode, 853 int locked_dir); 854 extern int ceph_release(struct inode *inode, struct file *filp); 855 extern void ceph_release_page_vector(struct page **pages, int num_pages); 856 857 /* dir.c */ 858 extern const struct file_operations ceph_dir_fops; 859 extern const struct inode_operations ceph_dir_iops; 860 extern struct dentry_operations ceph_dentry_ops, ceph_snap_dentry_ops, 861 ceph_snapdir_dentry_ops; 862 863 extern int ceph_handle_notrace_create(struct inode *dir, struct dentry *dentry); 864 extern struct dentry *ceph_finish_lookup(struct ceph_mds_request *req, 865 struct dentry *dentry, int err); 866 867 extern void ceph_dentry_lru_add(struct dentry *dn); 868 extern void ceph_dentry_lru_touch(struct dentry *dn); 869 extern void ceph_dentry_lru_del(struct dentry *dn); 870 extern void ceph_invalidate_dentry_lease(struct dentry *dentry); 871 872 /* 873 * our d_ops vary depending on whether the inode is live, 874 * snapshotted (read-only), or a virtual ".snap" directory. 875 */ 876 int ceph_init_dentry(struct dentry *dentry); 877 878 879 /* ioctl.c */ 880 extern long ceph_ioctl(struct file *file, unsigned int cmd, unsigned long arg); 881 882 /* export.c */ 883 extern const struct export_operations ceph_export_ops; 884 885 /* debugfs.c */ 886 extern int ceph_debugfs_init(void); 887 extern void ceph_debugfs_cleanup(void); 888 extern int ceph_debugfs_client_init(struct ceph_client *client); 889 extern void ceph_debugfs_client_cleanup(struct ceph_client *client); 890 891 static inline struct inode *get_dentry_parent_inode(struct dentry *dentry) 892 { 893 if (dentry && dentry->d_parent) 894 return dentry->d_parent->d_inode; 895 896 return NULL; 897 } 898 899 #endif /* _FS_CEPH_SUPER_H */ 900