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/slab.h> 14 #include <linux/wait.h> 15 #include <linux/writeback.h> 16 #include <linux/slab.h> 17 18 #include "types.h" 19 #include "messenger.h" 20 #include "msgpool.h" 21 #include "mon_client.h" 22 #include "mds_client.h" 23 #include "osd_client.h" 24 #include "ceph_fs.h" 25 26 /* f_type in struct statfs */ 27 #define CEPH_SUPER_MAGIC 0x00c36400 28 29 /* large granularity for statfs utilization stats to facilitate 30 * large volume sizes on 32-bit machines. */ 31 #define CEPH_BLOCK_SHIFT 20 /* 1 MB */ 32 #define CEPH_BLOCK (1 << CEPH_BLOCK_SHIFT) 33 34 /* 35 * mount options 36 */ 37 #define CEPH_OPT_FSID (1<<0) 38 #define CEPH_OPT_NOSHARE (1<<1) /* don't share client with other sbs */ 39 #define CEPH_OPT_MYIP (1<<2) /* specified my ip */ 40 #define CEPH_OPT_DIRSTAT (1<<4) /* funky `cat dirname` for stats */ 41 #define CEPH_OPT_RBYTES (1<<5) /* dir st_bytes = rbytes */ 42 #define CEPH_OPT_NOCRC (1<<6) /* no data crc on writes */ 43 #define CEPH_OPT_NOASYNCREADDIR (1<<7) /* no dcache readdir */ 44 45 #define CEPH_OPT_DEFAULT (CEPH_OPT_RBYTES) 46 47 #define ceph_set_opt(client, opt) \ 48 (client)->mount_args->flags |= CEPH_OPT_##opt; 49 #define ceph_test_opt(client, opt) \ 50 (!!((client)->mount_args->flags & CEPH_OPT_##opt)) 51 52 53 struct ceph_mount_args { 54 int sb_flags; 55 int flags; 56 struct ceph_fsid fsid; 57 struct ceph_entity_addr my_addr; 58 int num_mon; 59 struct ceph_entity_addr *mon_addr; 60 int mount_timeout; 61 int osd_idle_ttl; 62 int osd_timeout; 63 int osd_keepalive_timeout; 64 int wsize; 65 int rsize; /* max readahead */ 66 int congestion_kb; /* max writeback in flight */ 67 int caps_wanted_delay_min, caps_wanted_delay_max; 68 int cap_release_safety; 69 int max_readdir; /* max readdir result (entires) */ 70 int max_readdir_bytes; /* max readdir result (bytes) */ 71 char *snapdir_name; /* default ".snap" */ 72 char *name; 73 char *secret; 74 }; 75 76 /* 77 * defaults 78 */ 79 #define CEPH_MOUNT_TIMEOUT_DEFAULT 60 80 #define CEPH_OSD_TIMEOUT_DEFAULT 60 /* seconds */ 81 #define CEPH_OSD_KEEPALIVE_DEFAULT 5 82 #define CEPH_OSD_IDLE_TTL_DEFAULT 60 83 #define CEPH_MOUNT_RSIZE_DEFAULT (512*1024) /* readahead */ 84 #define CEPH_MAX_READDIR_DEFAULT 1024 85 #define CEPH_MAX_READDIR_BYTES_DEFAULT (512*1024) 86 87 #define CEPH_MSG_MAX_FRONT_LEN (16*1024*1024) 88 #define CEPH_MSG_MAX_DATA_LEN (16*1024*1024) 89 90 #define CEPH_SNAPDIRNAME_DEFAULT ".snap" 91 #define CEPH_AUTH_NAME_DEFAULT "guest" 92 /* 93 * Delay telling the MDS we no longer want caps, in case we reopen 94 * the file. Delay a minimum amount of time, even if we send a cap 95 * message for some other reason. Otherwise, take the oppotunity to 96 * update the mds to avoid sending another message later. 97 */ 98 #define CEPH_CAPS_WANTED_DELAY_MIN_DEFAULT 5 /* cap release delay */ 99 #define CEPH_CAPS_WANTED_DELAY_MAX_DEFAULT 60 /* cap release delay */ 100 101 #define CEPH_CAP_RELEASE_SAFETY_DEFAULT (CEPH_CAPS_PER_RELEASE * 4) 102 103 /* mount state */ 104 enum { 105 CEPH_MOUNT_MOUNTING, 106 CEPH_MOUNT_MOUNTED, 107 CEPH_MOUNT_UNMOUNTING, 108 CEPH_MOUNT_UNMOUNTED, 109 CEPH_MOUNT_SHUTDOWN, 110 }; 111 112 /* 113 * subtract jiffies 114 */ 115 static inline unsigned long time_sub(unsigned long a, unsigned long b) 116 { 117 BUG_ON(time_after(b, a)); 118 return (long)a - (long)b; 119 } 120 121 /* 122 * per-filesystem client state 123 * 124 * possibly shared by multiple mount points, if they are 125 * mounting the same ceph filesystem/cluster. 126 */ 127 struct ceph_client { 128 struct ceph_fsid fsid; 129 bool have_fsid; 130 131 struct mutex mount_mutex; /* serialize mount attempts */ 132 struct ceph_mount_args *mount_args; 133 134 struct super_block *sb; 135 136 unsigned long mount_state; 137 wait_queue_head_t auth_wq; 138 139 int auth_err; 140 141 int min_caps; /* min caps i added */ 142 143 struct ceph_messenger *msgr; /* messenger instance */ 144 struct ceph_mon_client monc; 145 struct ceph_mds_client mdsc; 146 struct ceph_osd_client osdc; 147 148 /* writeback */ 149 mempool_t *wb_pagevec_pool; 150 struct workqueue_struct *wb_wq; 151 struct workqueue_struct *pg_inv_wq; 152 struct workqueue_struct *trunc_wq; 153 atomic_long_t writeback_count; 154 155 struct backing_dev_info backing_dev_info; 156 157 #ifdef CONFIG_DEBUG_FS 158 struct dentry *debugfs_monmap; 159 struct dentry *debugfs_mdsmap, *debugfs_osdmap; 160 struct dentry *debugfs_dir, *debugfs_dentry_lru, *debugfs_caps; 161 struct dentry *debugfs_congestion_kb; 162 struct dentry *debugfs_bdi; 163 #endif 164 }; 165 166 /* 167 * File i/o capability. This tracks shared state with the metadata 168 * server that allows us to cache or writeback attributes or to read 169 * and write data. For any given inode, we should have one or more 170 * capabilities, one issued by each metadata server, and our 171 * cumulative access is the OR of all issued capabilities. 172 * 173 * Each cap is referenced by the inode's i_caps rbtree and by per-mds 174 * session capability lists. 175 */ 176 struct ceph_cap { 177 struct ceph_inode_info *ci; 178 struct rb_node ci_node; /* per-ci cap tree */ 179 struct ceph_mds_session *session; 180 struct list_head session_caps; /* per-session caplist */ 181 int mds; 182 u64 cap_id; /* unique cap id (mds provided) */ 183 int issued; /* latest, from the mds */ 184 int implemented; /* implemented superset of issued (for revocation) */ 185 int mds_wanted; 186 u32 seq, issue_seq, mseq; 187 u32 cap_gen; /* active/stale cycle */ 188 unsigned long last_used; 189 struct list_head caps_item; 190 }; 191 192 #define CHECK_CAPS_NODELAY 1 /* do not delay any further */ 193 #define CHECK_CAPS_AUTHONLY 2 /* only check auth cap */ 194 #define CHECK_CAPS_FLUSH 4 /* flush any dirty caps */ 195 196 /* 197 * Snapped cap state that is pending flush to mds. When a snapshot occurs, 198 * we first complete any in-process sync writes and writeback any dirty 199 * data before flushing the snapped state (tracked here) back to the MDS. 200 */ 201 struct ceph_cap_snap { 202 atomic_t nref; 203 struct ceph_inode_info *ci; 204 struct list_head ci_item, flushing_item; 205 206 u64 follows, flush_tid; 207 int issued, dirty; 208 struct ceph_snap_context *context; 209 210 mode_t mode; 211 uid_t uid; 212 gid_t gid; 213 214 void *xattr_blob; 215 int xattr_len; 216 u64 xattr_version; 217 218 u64 size; 219 struct timespec mtime, atime, ctime; 220 u64 time_warp_seq; 221 int writing; /* a sync write is still in progress */ 222 int dirty_pages; /* dirty pages awaiting writeback */ 223 }; 224 225 static inline void ceph_put_cap_snap(struct ceph_cap_snap *capsnap) 226 { 227 if (atomic_dec_and_test(&capsnap->nref)) 228 kfree(capsnap); 229 } 230 231 /* 232 * The frag tree describes how a directory is fragmented, potentially across 233 * multiple metadata servers. It is also used to indicate points where 234 * metadata authority is delegated, and whether/where metadata is replicated. 235 * 236 * A _leaf_ frag will be present in the i_fragtree IFF there is 237 * delegation info. That is, if mds >= 0 || ndist > 0. 238 */ 239 #define CEPH_MAX_DIRFRAG_REP 4 240 241 struct ceph_inode_frag { 242 struct rb_node node; 243 244 /* fragtree state */ 245 u32 frag; 246 int split_by; /* i.e. 2^(split_by) children */ 247 248 /* delegation and replication info */ 249 int mds; /* -1 if same authority as parent */ 250 int ndist; /* >0 if replicated */ 251 int dist[CEPH_MAX_DIRFRAG_REP]; 252 }; 253 254 /* 255 * We cache inode xattrs as an encoded blob until they are first used, 256 * at which point we parse them into an rbtree. 257 */ 258 struct ceph_inode_xattr { 259 struct rb_node node; 260 261 const char *name; 262 int name_len; 263 const char *val; 264 int val_len; 265 int dirty; 266 267 int should_free_name; 268 int should_free_val; 269 }; 270 271 struct ceph_inode_xattrs_info { 272 /* 273 * (still encoded) xattr blob. we avoid the overhead of parsing 274 * this until someone actually calls getxattr, etc. 275 * 276 * blob->vec.iov_len == 4 implies there are no xattrs; blob == 277 * NULL means we don't know. 278 */ 279 struct ceph_buffer *blob, *prealloc_blob; 280 281 struct rb_root index; 282 bool dirty; 283 int count; 284 int names_size; 285 int vals_size; 286 u64 version, index_version; 287 }; 288 289 /* 290 * Ceph inode. 291 */ 292 #define CEPH_I_COMPLETE 1 /* we have complete directory cached */ 293 #define CEPH_I_NODELAY 4 /* do not delay cap release */ 294 #define CEPH_I_FLUSH 8 /* do not delay flush of dirty metadata */ 295 #define CEPH_I_NOFLUSH 16 /* do not flush dirty caps */ 296 297 struct ceph_inode_info { 298 struct ceph_vino i_vino; /* ceph ino + snap */ 299 300 u64 i_version; 301 u32 i_time_warp_seq; 302 303 unsigned i_ceph_flags; 304 unsigned long i_release_count; 305 306 struct ceph_file_layout i_layout; 307 char *i_symlink; 308 309 /* for dirs */ 310 struct timespec i_rctime; 311 u64 i_rbytes, i_rfiles, i_rsubdirs; 312 u64 i_files, i_subdirs; 313 u64 i_max_offset; /* largest readdir offset, set with I_COMPLETE */ 314 315 struct rb_root i_fragtree; 316 struct mutex i_fragtree_mutex; 317 318 struct ceph_inode_xattrs_info i_xattrs; 319 320 /* capabilities. protected _both_ by i_lock and cap->session's 321 * s_mutex. */ 322 struct rb_root i_caps; /* cap list */ 323 struct ceph_cap *i_auth_cap; /* authoritative cap, if any */ 324 unsigned i_dirty_caps, i_flushing_caps; /* mask of dirtied fields */ 325 struct list_head i_dirty_item, i_flushing_item; 326 u64 i_cap_flush_seq; 327 /* we need to track cap writeback on a per-cap-bit basis, to allow 328 * overlapping, pipelined cap flushes to the mds. we can probably 329 * reduce the tid to 8 bits if we're concerned about inode size. */ 330 u16 i_cap_flush_last_tid, i_cap_flush_tid[CEPH_CAP_BITS]; 331 wait_queue_head_t i_cap_wq; /* threads waiting on a capability */ 332 unsigned long i_hold_caps_min; /* jiffies */ 333 unsigned long i_hold_caps_max; /* jiffies */ 334 struct list_head i_cap_delay_list; /* for delayed cap release to mds */ 335 int i_cap_exporting_mds; /* to handle cap migration between */ 336 unsigned i_cap_exporting_mseq; /* mds's. */ 337 unsigned i_cap_exporting_issued; 338 struct ceph_cap_reservation i_cap_migration_resv; 339 struct list_head i_cap_snaps; /* snapped state pending flush to mds */ 340 struct ceph_snap_context *i_head_snapc; /* set if wr_buffer_head > 0 */ 341 unsigned i_snap_caps; /* cap bits for snapped files */ 342 343 int i_nr_by_mode[CEPH_FILE_MODE_NUM]; /* open file counts */ 344 345 u32 i_truncate_seq; /* last truncate to smaller size */ 346 u64 i_truncate_size; /* and the size we last truncated down to */ 347 int i_truncate_pending; /* still need to call vmtruncate */ 348 349 u64 i_max_size; /* max file size authorized by mds */ 350 u64 i_reported_size; /* (max_)size reported to or requested of mds */ 351 u64 i_wanted_max_size; /* offset we'd like to write too */ 352 u64 i_requested_max_size; /* max_size we've requested */ 353 354 /* held references to caps */ 355 int i_pin_ref; 356 int i_rd_ref, i_rdcache_ref, i_wr_ref; 357 int i_wrbuffer_ref, i_wrbuffer_ref_head; 358 u32 i_shared_gen; /* increment each time we get FILE_SHARED */ 359 u32 i_rdcache_gen; /* we increment this each time we get 360 FILE_CACHE. If it's non-zero, we 361 _may_ have cached pages. */ 362 u32 i_rdcache_revoking; /* RDCACHE gen to async invalidate, if any */ 363 364 struct list_head i_unsafe_writes; /* uncommitted sync writes */ 365 struct list_head i_unsafe_dirops; /* uncommitted mds dir ops */ 366 spinlock_t i_unsafe_lock; 367 368 struct ceph_snap_realm *i_snap_realm; /* snap realm (if caps) */ 369 int i_snap_realm_counter; /* snap realm (if caps) */ 370 struct list_head i_snap_realm_item; 371 struct list_head i_snap_flush_item; 372 373 struct work_struct i_wb_work; /* writeback work */ 374 struct work_struct i_pg_inv_work; /* page invalidation work */ 375 376 struct work_struct i_vmtruncate_work; 377 378 struct inode vfs_inode; /* at end */ 379 }; 380 381 static inline struct ceph_inode_info *ceph_inode(struct inode *inode) 382 { 383 return container_of(inode, struct ceph_inode_info, vfs_inode); 384 } 385 386 static inline void ceph_i_clear(struct inode *inode, unsigned mask) 387 { 388 struct ceph_inode_info *ci = ceph_inode(inode); 389 390 spin_lock(&inode->i_lock); 391 ci->i_ceph_flags &= ~mask; 392 spin_unlock(&inode->i_lock); 393 } 394 395 static inline void ceph_i_set(struct inode *inode, unsigned mask) 396 { 397 struct ceph_inode_info *ci = ceph_inode(inode); 398 399 spin_lock(&inode->i_lock); 400 ci->i_ceph_flags |= mask; 401 spin_unlock(&inode->i_lock); 402 } 403 404 static inline bool ceph_i_test(struct inode *inode, unsigned mask) 405 { 406 struct ceph_inode_info *ci = ceph_inode(inode); 407 bool r; 408 409 smp_mb(); 410 r = (ci->i_ceph_flags & mask) == mask; 411 return r; 412 } 413 414 415 /* find a specific frag @f */ 416 extern struct ceph_inode_frag *__ceph_find_frag(struct ceph_inode_info *ci, 417 u32 f); 418 419 /* 420 * choose fragment for value @v. copy frag content to pfrag, if leaf 421 * exists 422 */ 423 extern u32 ceph_choose_frag(struct ceph_inode_info *ci, u32 v, 424 struct ceph_inode_frag *pfrag, 425 int *found); 426 427 /* 428 * Ceph dentry state 429 */ 430 struct ceph_dentry_info { 431 struct ceph_mds_session *lease_session; 432 u32 lease_gen, lease_shared_gen; 433 u32 lease_seq; 434 unsigned long lease_renew_after, lease_renew_from; 435 struct list_head lru; 436 struct dentry *dentry; 437 u64 time; 438 u64 offset; 439 }; 440 441 static inline struct ceph_dentry_info *ceph_dentry(struct dentry *dentry) 442 { 443 return (struct ceph_dentry_info *)dentry->d_fsdata; 444 } 445 446 static inline loff_t ceph_make_fpos(unsigned frag, unsigned off) 447 { 448 return ((loff_t)frag << 32) | (loff_t)off; 449 } 450 451 /* 452 * ino_t is <64 bits on many architectures, blech. 453 * 454 * don't include snap in ino hash, at least for now. 455 */ 456 static inline ino_t ceph_vino_to_ino(struct ceph_vino vino) 457 { 458 ino_t ino = (ino_t)vino.ino; /* ^ (vino.snap << 20); */ 459 #if BITS_PER_LONG == 32 460 ino ^= vino.ino >> (sizeof(u64)-sizeof(ino_t)) * 8; 461 if (!ino) 462 ino = 1; 463 #endif 464 return ino; 465 } 466 467 static inline int ceph_set_ino_cb(struct inode *inode, void *data) 468 { 469 ceph_inode(inode)->i_vino = *(struct ceph_vino *)data; 470 inode->i_ino = ceph_vino_to_ino(*(struct ceph_vino *)data); 471 return 0; 472 } 473 474 static inline struct ceph_vino ceph_vino(struct inode *inode) 475 { 476 return ceph_inode(inode)->i_vino; 477 } 478 479 /* for printf-style formatting */ 480 #define ceph_vinop(i) ceph_inode(i)->i_vino.ino, ceph_inode(i)->i_vino.snap 481 482 static inline u64 ceph_ino(struct inode *inode) 483 { 484 return ceph_inode(inode)->i_vino.ino; 485 } 486 static inline u64 ceph_snap(struct inode *inode) 487 { 488 return ceph_inode(inode)->i_vino.snap; 489 } 490 491 static inline int ceph_ino_compare(struct inode *inode, void *data) 492 { 493 struct ceph_vino *pvino = (struct ceph_vino *)data; 494 struct ceph_inode_info *ci = ceph_inode(inode); 495 return ci->i_vino.ino == pvino->ino && 496 ci->i_vino.snap == pvino->snap; 497 } 498 499 static inline struct inode *ceph_find_inode(struct super_block *sb, 500 struct ceph_vino vino) 501 { 502 ino_t t = ceph_vino_to_ino(vino); 503 return ilookup5(sb, t, ceph_ino_compare, &vino); 504 } 505 506 507 /* 508 * caps helpers 509 */ 510 static inline bool __ceph_is_any_real_caps(struct ceph_inode_info *ci) 511 { 512 return !RB_EMPTY_ROOT(&ci->i_caps); 513 } 514 515 extern int __ceph_caps_issued(struct ceph_inode_info *ci, int *implemented); 516 extern int __ceph_caps_issued_mask(struct ceph_inode_info *ci, int mask, int t); 517 extern int __ceph_caps_issued_other(struct ceph_inode_info *ci, 518 struct ceph_cap *cap); 519 520 static inline int ceph_caps_issued(struct ceph_inode_info *ci) 521 { 522 int issued; 523 spin_lock(&ci->vfs_inode.i_lock); 524 issued = __ceph_caps_issued(ci, NULL); 525 spin_unlock(&ci->vfs_inode.i_lock); 526 return issued; 527 } 528 529 static inline int ceph_caps_issued_mask(struct ceph_inode_info *ci, int mask, 530 int touch) 531 { 532 int r; 533 spin_lock(&ci->vfs_inode.i_lock); 534 r = __ceph_caps_issued_mask(ci, mask, touch); 535 spin_unlock(&ci->vfs_inode.i_lock); 536 return r; 537 } 538 539 static inline int __ceph_caps_dirty(struct ceph_inode_info *ci) 540 { 541 return ci->i_dirty_caps | ci->i_flushing_caps; 542 } 543 extern void __ceph_mark_dirty_caps(struct ceph_inode_info *ci, int mask); 544 545 extern int ceph_caps_revoking(struct ceph_inode_info *ci, int mask); 546 extern int __ceph_caps_used(struct ceph_inode_info *ci); 547 548 extern int __ceph_caps_file_wanted(struct ceph_inode_info *ci); 549 550 /* 551 * wanted, by virtue of open file modes AND cap refs (buffered/cached data) 552 */ 553 static inline int __ceph_caps_wanted(struct ceph_inode_info *ci) 554 { 555 int w = __ceph_caps_file_wanted(ci) | __ceph_caps_used(ci); 556 if (w & CEPH_CAP_FILE_BUFFER) 557 w |= CEPH_CAP_FILE_EXCL; /* we want EXCL if dirty data */ 558 return w; 559 } 560 561 /* what the mds thinks we want */ 562 extern int __ceph_caps_mds_wanted(struct ceph_inode_info *ci); 563 564 extern void ceph_caps_init(void); 565 extern void ceph_caps_finalize(void); 566 extern void ceph_adjust_min_caps(int delta); 567 extern int ceph_reserve_caps(struct ceph_cap_reservation *ctx, int need); 568 extern int ceph_unreserve_caps(struct ceph_cap_reservation *ctx); 569 extern void ceph_reservation_status(struct ceph_client *client, 570 int *total, int *avail, int *used, 571 int *reserved, int *min); 572 573 static inline struct ceph_client *ceph_inode_to_client(struct inode *inode) 574 { 575 return (struct ceph_client *)inode->i_sb->s_fs_info; 576 } 577 578 static inline struct ceph_client *ceph_sb_to_client(struct super_block *sb) 579 { 580 return (struct ceph_client *)sb->s_fs_info; 581 } 582 583 584 /* 585 * we keep buffered readdir results attached to file->private_data 586 */ 587 struct ceph_file_info { 588 int fmode; /* initialized on open */ 589 590 /* readdir: position within the dir */ 591 u32 frag; 592 struct ceph_mds_request *last_readdir; 593 int at_end; 594 595 /* readdir: position within a frag */ 596 unsigned offset; /* offset of last chunk, adjusted for . and .. */ 597 u64 next_offset; /* offset of next chunk (last_name's + 1) */ 598 char *last_name; /* last entry in previous chunk */ 599 struct dentry *dentry; /* next dentry (for dcache readdir) */ 600 unsigned long dir_release_count; 601 602 /* used for -o dirstat read() on directory thing */ 603 char *dir_info; 604 int dir_info_len; 605 }; 606 607 608 609 /* 610 * snapshots 611 */ 612 613 /* 614 * A "snap context" is the set of existing snapshots when we 615 * write data. It is used by the OSD to guide its COW behavior. 616 * 617 * The ceph_snap_context is refcounted, and attached to each dirty 618 * page, indicating which context the dirty data belonged when it was 619 * dirtied. 620 */ 621 struct ceph_snap_context { 622 atomic_t nref; 623 u64 seq; 624 int num_snaps; 625 u64 snaps[]; 626 }; 627 628 static inline struct ceph_snap_context * 629 ceph_get_snap_context(struct ceph_snap_context *sc) 630 { 631 /* 632 printk("get_snap_context %p %d -> %d\n", sc, atomic_read(&sc->nref), 633 atomic_read(&sc->nref)+1); 634 */ 635 if (sc) 636 atomic_inc(&sc->nref); 637 return sc; 638 } 639 640 static inline void ceph_put_snap_context(struct ceph_snap_context *sc) 641 { 642 if (!sc) 643 return; 644 /* 645 printk("put_snap_context %p %d -> %d\n", sc, atomic_read(&sc->nref), 646 atomic_read(&sc->nref)-1); 647 */ 648 if (atomic_dec_and_test(&sc->nref)) { 649 /*printk(" deleting snap_context %p\n", sc);*/ 650 kfree(sc); 651 } 652 } 653 654 /* 655 * A "snap realm" describes a subset of the file hierarchy sharing 656 * the same set of snapshots that apply to it. The realms themselves 657 * are organized into a hierarchy, such that children inherit (some of) 658 * the snapshots of their parents. 659 * 660 * All inodes within the realm that have capabilities are linked into a 661 * per-realm list. 662 */ 663 struct ceph_snap_realm { 664 u64 ino; 665 atomic_t nref; 666 struct rb_node node; 667 668 u64 created, seq; 669 u64 parent_ino; 670 u64 parent_since; /* snapid when our current parent became so */ 671 672 u64 *prior_parent_snaps; /* snaps inherited from any parents we */ 673 int num_prior_parent_snaps; /* had prior to parent_since */ 674 u64 *snaps; /* snaps specific to this realm */ 675 int num_snaps; 676 677 struct ceph_snap_realm *parent; 678 struct list_head children; /* list of child realms */ 679 struct list_head child_item; 680 681 struct list_head empty_item; /* if i have ref==0 */ 682 683 /* the current set of snaps for this realm */ 684 struct ceph_snap_context *cached_context; 685 686 struct list_head inodes_with_caps; 687 spinlock_t inodes_with_caps_lock; 688 }; 689 690 691 692 /* 693 * calculate the number of pages a given length and offset map onto, 694 * if we align the data. 695 */ 696 static inline int calc_pages_for(u64 off, u64 len) 697 { 698 return ((off+len+PAGE_CACHE_SIZE-1) >> PAGE_CACHE_SHIFT) - 699 (off >> PAGE_CACHE_SHIFT); 700 } 701 702 703 704 /* snap.c */ 705 struct ceph_snap_realm *ceph_lookup_snap_realm(struct ceph_mds_client *mdsc, 706 u64 ino); 707 extern void ceph_get_snap_realm(struct ceph_mds_client *mdsc, 708 struct ceph_snap_realm *realm); 709 extern void ceph_put_snap_realm(struct ceph_mds_client *mdsc, 710 struct ceph_snap_realm *realm); 711 extern int ceph_update_snap_trace(struct ceph_mds_client *m, 712 void *p, void *e, bool deletion); 713 extern void ceph_handle_snap(struct ceph_mds_client *mdsc, 714 struct ceph_mds_session *session, 715 struct ceph_msg *msg); 716 extern void ceph_queue_cap_snap(struct ceph_inode_info *ci); 717 extern int __ceph_finish_cap_snap(struct ceph_inode_info *ci, 718 struct ceph_cap_snap *capsnap); 719 extern void ceph_cleanup_empty_realms(struct ceph_mds_client *mdsc); 720 721 /* 722 * a cap_snap is "pending" if it is still awaiting an in-progress 723 * sync write (that may/may not still update size, mtime, etc.). 724 */ 725 static inline bool __ceph_have_pending_cap_snap(struct ceph_inode_info *ci) 726 { 727 return !list_empty(&ci->i_cap_snaps) && 728 list_entry(ci->i_cap_snaps.prev, struct ceph_cap_snap, 729 ci_item)->writing; 730 } 731 732 733 /* super.c */ 734 extern struct kmem_cache *ceph_inode_cachep; 735 extern struct kmem_cache *ceph_cap_cachep; 736 extern struct kmem_cache *ceph_dentry_cachep; 737 extern struct kmem_cache *ceph_file_cachep; 738 739 extern const char *ceph_msg_type_name(int type); 740 extern int ceph_check_fsid(struct ceph_client *client, struct ceph_fsid *fsid); 741 742 #define FSID_FORMAT "%02x%02x%02x%02x-%02x%02x-%02x%02x-%02x%02x-" \ 743 "%02x%02x%02x%02x%02x%02x" 744 #define PR_FSID(f) (f)->fsid[0], (f)->fsid[1], (f)->fsid[2], (f)->fsid[3], \ 745 (f)->fsid[4], (f)->fsid[5], (f)->fsid[6], (f)->fsid[7], \ 746 (f)->fsid[8], (f)->fsid[9], (f)->fsid[10], (f)->fsid[11], \ 747 (f)->fsid[12], (f)->fsid[13], (f)->fsid[14], (f)->fsid[15] 748 749 /* inode.c */ 750 extern const struct inode_operations ceph_file_iops; 751 752 extern struct inode *ceph_alloc_inode(struct super_block *sb); 753 extern void ceph_destroy_inode(struct inode *inode); 754 755 extern struct inode *ceph_get_inode(struct super_block *sb, 756 struct ceph_vino vino); 757 extern struct inode *ceph_get_snapdir(struct inode *parent); 758 extern int ceph_fill_file_size(struct inode *inode, int issued, 759 u32 truncate_seq, u64 truncate_size, u64 size); 760 extern void ceph_fill_file_time(struct inode *inode, int issued, 761 u64 time_warp_seq, struct timespec *ctime, 762 struct timespec *mtime, struct timespec *atime); 763 extern int ceph_fill_trace(struct super_block *sb, 764 struct ceph_mds_request *req, 765 struct ceph_mds_session *session); 766 extern int ceph_readdir_prepopulate(struct ceph_mds_request *req, 767 struct ceph_mds_session *session); 768 769 extern int ceph_inode_holds_cap(struct inode *inode, int mask); 770 771 extern int ceph_inode_set_size(struct inode *inode, loff_t size); 772 extern void __ceph_do_pending_vmtruncate(struct inode *inode); 773 extern void ceph_queue_vmtruncate(struct inode *inode); 774 775 extern void ceph_queue_invalidate(struct inode *inode); 776 extern void ceph_queue_writeback(struct inode *inode); 777 778 extern int ceph_do_getattr(struct inode *inode, int mask); 779 extern int ceph_permission(struct inode *inode, int mask); 780 extern int ceph_setattr(struct dentry *dentry, struct iattr *attr); 781 extern int ceph_getattr(struct vfsmount *mnt, struct dentry *dentry, 782 struct kstat *stat); 783 784 /* xattr.c */ 785 extern int ceph_setxattr(struct dentry *, const char *, const void *, 786 size_t, int); 787 extern ssize_t ceph_getxattr(struct dentry *, const char *, void *, size_t); 788 extern ssize_t ceph_listxattr(struct dentry *, char *, size_t); 789 extern int ceph_removexattr(struct dentry *, const char *); 790 extern void __ceph_build_xattrs_blob(struct ceph_inode_info *ci); 791 extern void __ceph_destroy_xattrs(struct ceph_inode_info *ci); 792 793 /* caps.c */ 794 extern const char *ceph_cap_string(int c); 795 extern void ceph_handle_caps(struct ceph_mds_session *session, 796 struct ceph_msg *msg); 797 extern int ceph_add_cap(struct inode *inode, 798 struct ceph_mds_session *session, u64 cap_id, 799 int fmode, unsigned issued, unsigned wanted, 800 unsigned cap, unsigned seq, u64 realmino, int flags, 801 struct ceph_cap_reservation *caps_reservation); 802 extern void __ceph_remove_cap(struct ceph_cap *cap); 803 static inline void ceph_remove_cap(struct ceph_cap *cap) 804 { 805 struct inode *inode = &cap->ci->vfs_inode; 806 spin_lock(&inode->i_lock); 807 __ceph_remove_cap(cap); 808 spin_unlock(&inode->i_lock); 809 } 810 extern void ceph_put_cap(struct ceph_cap *cap); 811 812 extern void ceph_queue_caps_release(struct inode *inode); 813 extern int ceph_write_inode(struct inode *inode, struct writeback_control *wbc); 814 extern int ceph_fsync(struct file *file, struct dentry *dentry, int datasync); 815 extern void ceph_kick_flushing_caps(struct ceph_mds_client *mdsc, 816 struct ceph_mds_session *session); 817 extern int ceph_get_cap_mds(struct inode *inode); 818 extern void ceph_get_cap_refs(struct ceph_inode_info *ci, int caps); 819 extern void ceph_put_cap_refs(struct ceph_inode_info *ci, int had); 820 extern void ceph_put_wrbuffer_cap_refs(struct ceph_inode_info *ci, int nr, 821 struct ceph_snap_context *snapc); 822 extern void __ceph_flush_snaps(struct ceph_inode_info *ci, 823 struct ceph_mds_session **psession); 824 extern void ceph_check_caps(struct ceph_inode_info *ci, int flags, 825 struct ceph_mds_session *session); 826 extern void ceph_check_delayed_caps(struct ceph_mds_client *mdsc); 827 extern void ceph_flush_dirty_caps(struct ceph_mds_client *mdsc); 828 829 extern int ceph_encode_inode_release(void **p, struct inode *inode, 830 int mds, int drop, int unless, int force); 831 extern int ceph_encode_dentry_release(void **p, struct dentry *dn, 832 int mds, int drop, int unless); 833 834 extern int ceph_get_caps(struct ceph_inode_info *ci, int need, int want, 835 int *got, loff_t endoff); 836 837 /* for counting open files by mode */ 838 static inline void __ceph_get_fmode(struct ceph_inode_info *ci, int mode) 839 { 840 ci->i_nr_by_mode[mode]++; 841 } 842 extern void ceph_put_fmode(struct ceph_inode_info *ci, int mode); 843 844 /* addr.c */ 845 extern const struct address_space_operations ceph_aops; 846 extern int ceph_mmap(struct file *file, struct vm_area_struct *vma); 847 848 /* file.c */ 849 extern const struct file_operations ceph_file_fops; 850 extern const struct address_space_operations ceph_aops; 851 extern int ceph_open(struct inode *inode, struct file *file); 852 extern struct dentry *ceph_lookup_open(struct inode *dir, struct dentry *dentry, 853 struct nameidata *nd, int mode, 854 int locked_dir); 855 extern int ceph_release(struct inode *inode, struct file *filp); 856 extern void ceph_release_page_vector(struct page **pages, int num_pages); 857 858 /* dir.c */ 859 extern const struct file_operations ceph_dir_fops; 860 extern const struct inode_operations ceph_dir_iops; 861 extern struct dentry_operations ceph_dentry_ops, ceph_snap_dentry_ops, 862 ceph_snapdir_dentry_ops; 863 864 extern int ceph_handle_notrace_create(struct inode *dir, struct dentry *dentry); 865 extern struct dentry *ceph_finish_lookup(struct ceph_mds_request *req, 866 struct dentry *dentry, int err); 867 868 extern void ceph_dentry_lru_add(struct dentry *dn); 869 extern void ceph_dentry_lru_touch(struct dentry *dn); 870 extern void ceph_dentry_lru_del(struct dentry *dn); 871 extern void ceph_invalidate_dentry_lease(struct dentry *dentry); 872 873 /* 874 * our d_ops vary depending on whether the inode is live, 875 * snapshotted (read-only), or a virtual ".snap" directory. 876 */ 877 int ceph_init_dentry(struct dentry *dentry); 878 879 880 /* ioctl.c */ 881 extern long ceph_ioctl(struct file *file, unsigned int cmd, unsigned long arg); 882 883 /* export.c */ 884 extern const struct export_operations ceph_export_ops; 885 886 /* debugfs.c */ 887 extern int ceph_debugfs_init(void); 888 extern void ceph_debugfs_cleanup(void); 889 extern int ceph_debugfs_client_init(struct ceph_client *client); 890 extern void ceph_debugfs_client_cleanup(struct ceph_client *client); 891 892 static inline struct inode *get_dentry_parent_inode(struct dentry *dentry) 893 { 894 if (dentry && dentry->d_parent) 895 return dentry->d_parent->d_inode; 896 897 return NULL; 898 } 899 900 #endif /* _FS_CEPH_SUPER_H */ 901