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 num_mon; 56 struct ceph_entity_addr *mon_addr; 57 int flags; 58 int mount_timeout; 59 int osd_idle_ttl; 60 int caps_wanted_delay_min, caps_wanted_delay_max; 61 struct ceph_fsid fsid; 62 struct ceph_entity_addr my_addr; 63 int wsize; 64 int rsize; /* max readahead */ 65 int max_readdir; /* max readdir size */ 66 int congestion_kb; /* max readdir size */ 67 int osd_timeout; 68 int osd_keepalive_timeout; 69 char *snapdir_name; /* default ".snap" */ 70 char *name; 71 char *secret; 72 int cap_release_safety; 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 84 #define CEPH_MSG_MAX_FRONT_LEN (16*1024*1024) 85 #define CEPH_MSG_MAX_DATA_LEN (16*1024*1024) 86 87 #define CEPH_SNAPDIRNAME_DEFAULT ".snap" 88 #define CEPH_AUTH_NAME_DEFAULT "guest" 89 90 /* 91 * Delay telling the MDS we no longer want caps, in case we reopen 92 * the file. Delay a minimum amount of time, even if we send a cap 93 * message for some other reason. Otherwise, take the oppotunity to 94 * update the mds to avoid sending another message later. 95 */ 96 #define CEPH_CAPS_WANTED_DELAY_MIN_DEFAULT 5 /* cap release delay */ 97 #define CEPH_CAPS_WANTED_DELAY_MAX_DEFAULT 60 /* cap release delay */ 98 99 100 /* mount state */ 101 enum { 102 CEPH_MOUNT_MOUNTING, 103 CEPH_MOUNT_MOUNTED, 104 CEPH_MOUNT_UNMOUNTING, 105 CEPH_MOUNT_UNMOUNTED, 106 CEPH_MOUNT_SHUTDOWN, 107 }; 108 109 /* 110 * subtract jiffies 111 */ 112 static inline unsigned long time_sub(unsigned long a, unsigned long b) 113 { 114 BUG_ON(time_after(b, a)); 115 return (long)a - (long)b; 116 } 117 118 /* 119 * per-filesystem client state 120 * 121 * possibly shared by multiple mount points, if they are 122 * mounting the same ceph filesystem/cluster. 123 */ 124 struct ceph_client { 125 struct ceph_fsid fsid; 126 bool have_fsid; 127 128 struct mutex mount_mutex; /* serialize mount attempts */ 129 struct ceph_mount_args *mount_args; 130 131 struct super_block *sb; 132 133 unsigned long mount_state; 134 wait_queue_head_t auth_wq; 135 136 int auth_err; 137 138 int min_caps; /* min caps i added */ 139 140 struct ceph_messenger *msgr; /* messenger instance */ 141 struct ceph_mon_client monc; 142 struct ceph_mds_client mdsc; 143 struct ceph_osd_client osdc; 144 145 /* writeback */ 146 mempool_t *wb_pagevec_pool; 147 struct workqueue_struct *wb_wq; 148 struct workqueue_struct *pg_inv_wq; 149 struct workqueue_struct *trunc_wq; 150 atomic_long_t writeback_count; 151 152 struct backing_dev_info backing_dev_info; 153 154 #ifdef CONFIG_DEBUG_FS 155 struct dentry *debugfs_monmap; 156 struct dentry *debugfs_mdsmap, *debugfs_osdmap; 157 struct dentry *debugfs_dir, *debugfs_dentry_lru, *debugfs_caps; 158 struct dentry *debugfs_congestion_kb; 159 struct dentry *debugfs_bdi; 160 #endif 161 }; 162 163 static inline struct ceph_client *ceph_client(struct super_block *sb) 164 { 165 return sb->s_fs_info; 166 } 167 168 169 /* 170 * File i/o capability. This tracks shared state with the metadata 171 * server that allows us to cache or writeback attributes or to read 172 * and write data. For any given inode, we should have one or more 173 * capabilities, one issued by each metadata server, and our 174 * cumulative access is the OR of all issued capabilities. 175 * 176 * Each cap is referenced by the inode's i_caps rbtree and by per-mds 177 * session capability lists. 178 */ 179 struct ceph_cap { 180 struct ceph_inode_info *ci; 181 struct rb_node ci_node; /* per-ci cap tree */ 182 struct ceph_mds_session *session; 183 struct list_head session_caps; /* per-session caplist */ 184 int mds; 185 u64 cap_id; /* unique cap id (mds provided) */ 186 int issued; /* latest, from the mds */ 187 int implemented; /* implemented superset of issued (for revocation) */ 188 int mds_wanted; 189 u32 seq, issue_seq, mseq; 190 u32 cap_gen; /* active/stale cycle */ 191 unsigned long last_used; 192 struct list_head caps_item; 193 }; 194 195 #define CHECK_CAPS_NODELAY 1 /* do not delay any further */ 196 #define CHECK_CAPS_AUTHONLY 2 /* only check auth cap */ 197 #define CHECK_CAPS_FLUSH 4 /* flush any dirty caps */ 198 199 /* 200 * Snapped cap state that is pending flush to mds. When a snapshot occurs, 201 * we first complete any in-process sync writes and writeback any dirty 202 * data before flushing the snapped state (tracked here) back to the MDS. 203 */ 204 struct ceph_cap_snap { 205 atomic_t nref; 206 struct ceph_inode_info *ci; 207 struct list_head ci_item, flushing_item; 208 209 u64 follows, flush_tid; 210 int issued, dirty; 211 struct ceph_snap_context *context; 212 213 mode_t mode; 214 uid_t uid; 215 gid_t gid; 216 217 void *xattr_blob; 218 int xattr_len; 219 u64 xattr_version; 220 221 u64 size; 222 struct timespec mtime, atime, ctime; 223 u64 time_warp_seq; 224 int writing; /* a sync write is still in progress */ 225 int dirty_pages; /* dirty pages awaiting writeback */ 226 }; 227 228 static inline void ceph_put_cap_snap(struct ceph_cap_snap *capsnap) 229 { 230 if (atomic_dec_and_test(&capsnap->nref)) 231 kfree(capsnap); 232 } 233 234 /* 235 * The frag tree describes how a directory is fragmented, potentially across 236 * multiple metadata servers. It is also used to indicate points where 237 * metadata authority is delegated, and whether/where metadata is replicated. 238 * 239 * A _leaf_ frag will be present in the i_fragtree IFF there is 240 * delegation info. That is, if mds >= 0 || ndist > 0. 241 */ 242 #define CEPH_MAX_DIRFRAG_REP 4 243 244 struct ceph_inode_frag { 245 struct rb_node node; 246 247 /* fragtree state */ 248 u32 frag; 249 int split_by; /* i.e. 2^(split_by) children */ 250 251 /* delegation and replication info */ 252 int mds; /* -1 if same authority as parent */ 253 int ndist; /* >0 if replicated */ 254 int dist[CEPH_MAX_DIRFRAG_REP]; 255 }; 256 257 /* 258 * We cache inode xattrs as an encoded blob until they are first used, 259 * at which point we parse them into an rbtree. 260 */ 261 struct ceph_inode_xattr { 262 struct rb_node node; 263 264 const char *name; 265 int name_len; 266 const char *val; 267 int val_len; 268 int dirty; 269 270 int should_free_name; 271 int should_free_val; 272 }; 273 274 struct ceph_inode_xattrs_info { 275 /* 276 * (still encoded) xattr blob. we avoid the overhead of parsing 277 * this until someone actually calls getxattr, etc. 278 * 279 * blob->vec.iov_len == 4 implies there are no xattrs; blob == 280 * NULL means we don't know. 281 */ 282 struct ceph_buffer *blob, *prealloc_blob; 283 284 struct rb_root index; 285 bool dirty; 286 int count; 287 int names_size; 288 int vals_size; 289 u64 version, index_version; 290 }; 291 292 /* 293 * Ceph inode. 294 */ 295 #define CEPH_I_COMPLETE 1 /* we have complete directory cached */ 296 #define CEPH_I_NODELAY 4 /* do not delay cap release */ 297 #define CEPH_I_FLUSH 8 /* do not delay flush of dirty metadata */ 298 #define CEPH_I_NOFLUSH 16 /* do not flush dirty caps */ 299 300 struct ceph_inode_info { 301 struct ceph_vino i_vino; /* ceph ino + snap */ 302 303 u64 i_version; 304 u32 i_time_warp_seq; 305 306 unsigned i_ceph_flags; 307 unsigned long i_release_count; 308 309 struct ceph_file_layout i_layout; 310 char *i_symlink; 311 312 /* for dirs */ 313 struct timespec i_rctime; 314 u64 i_rbytes, i_rfiles, i_rsubdirs; 315 u64 i_files, i_subdirs; 316 u64 i_max_offset; /* largest readdir offset, set with I_COMPLETE */ 317 318 struct rb_root i_fragtree; 319 struct mutex i_fragtree_mutex; 320 321 struct ceph_inode_xattrs_info i_xattrs; 322 323 /* capabilities. protected _both_ by i_lock and cap->session's 324 * s_mutex. */ 325 struct rb_root i_caps; /* cap list */ 326 struct ceph_cap *i_auth_cap; /* authoritative cap, if any */ 327 unsigned i_dirty_caps, i_flushing_caps; /* mask of dirtied fields */ 328 struct list_head i_dirty_item, i_flushing_item; 329 u64 i_cap_flush_seq; 330 /* we need to track cap writeback on a per-cap-bit basis, to allow 331 * overlapping, pipelined cap flushes to the mds. we can probably 332 * reduce the tid to 8 bits if we're concerned about inode size. */ 333 u16 i_cap_flush_last_tid, i_cap_flush_tid[CEPH_CAP_BITS]; 334 wait_queue_head_t i_cap_wq; /* threads waiting on a capability */ 335 unsigned long i_hold_caps_min; /* jiffies */ 336 unsigned long i_hold_caps_max; /* jiffies */ 337 struct list_head i_cap_delay_list; /* for delayed cap release to mds */ 338 int i_cap_exporting_mds; /* to handle cap migration between */ 339 unsigned i_cap_exporting_mseq; /* mds's. */ 340 unsigned i_cap_exporting_issued; 341 struct ceph_cap_reservation i_cap_migration_resv; 342 struct list_head i_cap_snaps; /* snapped state pending flush to mds */ 343 struct ceph_snap_context *i_head_snapc; /* set if wr_buffer_head > 0 */ 344 unsigned i_snap_caps; /* cap bits for snapped files */ 345 346 int i_nr_by_mode[CEPH_FILE_MODE_NUM]; /* open file counts */ 347 348 u32 i_truncate_seq; /* last truncate to smaller size */ 349 u64 i_truncate_size; /* and the size we last truncated down to */ 350 int i_truncate_pending; /* still need to call vmtruncate */ 351 352 u64 i_max_size; /* max file size authorized by mds */ 353 u64 i_reported_size; /* (max_)size reported to or requested of mds */ 354 u64 i_wanted_max_size; /* offset we'd like to write too */ 355 u64 i_requested_max_size; /* max_size we've requested */ 356 357 /* held references to caps */ 358 int i_pin_ref; 359 int i_rd_ref, i_rdcache_ref, i_wr_ref; 360 int i_wrbuffer_ref, i_wrbuffer_ref_head; 361 u32 i_shared_gen; /* increment each time we get FILE_SHARED */ 362 u32 i_rdcache_gen; /* we increment this each time we get 363 FILE_CACHE. If it's non-zero, we 364 _may_ have cached pages. */ 365 u32 i_rdcache_revoking; /* RDCACHE gen to async invalidate, if any */ 366 367 struct list_head i_unsafe_writes; /* uncommitted sync writes */ 368 struct list_head i_unsafe_dirops; /* uncommitted mds dir ops */ 369 spinlock_t i_unsafe_lock; 370 371 struct ceph_snap_realm *i_snap_realm; /* snap realm (if caps) */ 372 int i_snap_realm_counter; /* snap realm (if caps) */ 373 struct list_head i_snap_realm_item; 374 struct list_head i_snap_flush_item; 375 376 struct work_struct i_wb_work; /* writeback work */ 377 struct work_struct i_pg_inv_work; /* page invalidation work */ 378 379 struct work_struct i_vmtruncate_work; 380 381 struct inode vfs_inode; /* at end */ 382 }; 383 384 static inline struct ceph_inode_info *ceph_inode(struct inode *inode) 385 { 386 return container_of(inode, struct ceph_inode_info, vfs_inode); 387 } 388 389 static inline void ceph_i_clear(struct inode *inode, unsigned mask) 390 { 391 struct ceph_inode_info *ci = ceph_inode(inode); 392 393 spin_lock(&inode->i_lock); 394 ci->i_ceph_flags &= ~mask; 395 spin_unlock(&inode->i_lock); 396 } 397 398 static inline void ceph_i_set(struct inode *inode, unsigned mask) 399 { 400 struct ceph_inode_info *ci = ceph_inode(inode); 401 402 spin_lock(&inode->i_lock); 403 ci->i_ceph_flags |= mask; 404 spin_unlock(&inode->i_lock); 405 } 406 407 static inline bool ceph_i_test(struct inode *inode, unsigned mask) 408 { 409 struct ceph_inode_info *ci = ceph_inode(inode); 410 bool r; 411 412 smp_mb(); 413 r = (ci->i_ceph_flags & mask) == mask; 414 return r; 415 } 416 417 418 /* find a specific frag @f */ 419 extern struct ceph_inode_frag *__ceph_find_frag(struct ceph_inode_info *ci, 420 u32 f); 421 422 /* 423 * choose fragment for value @v. copy frag content to pfrag, if leaf 424 * exists 425 */ 426 extern u32 ceph_choose_frag(struct ceph_inode_info *ci, u32 v, 427 struct ceph_inode_frag *pfrag, 428 int *found); 429 430 /* 431 * Ceph dentry state 432 */ 433 struct ceph_dentry_info { 434 struct ceph_mds_session *lease_session; 435 u32 lease_gen, lease_shared_gen; 436 u32 lease_seq; 437 unsigned long lease_renew_after, lease_renew_from; 438 struct list_head lru; 439 struct dentry *dentry; 440 u64 time; 441 u64 offset; 442 }; 443 444 static inline struct ceph_dentry_info *ceph_dentry(struct dentry *dentry) 445 { 446 return (struct ceph_dentry_info *)dentry->d_fsdata; 447 } 448 449 static inline loff_t ceph_make_fpos(unsigned frag, unsigned off) 450 { 451 return ((loff_t)frag << 32) | (loff_t)off; 452 } 453 454 /* 455 * ino_t is <64 bits on many architectures, blech. 456 * 457 * don't include snap in ino hash, at least for now. 458 */ 459 static inline ino_t ceph_vino_to_ino(struct ceph_vino vino) 460 { 461 ino_t ino = (ino_t)vino.ino; /* ^ (vino.snap << 20); */ 462 #if BITS_PER_LONG == 32 463 ino ^= vino.ino >> (sizeof(u64)-sizeof(ino_t)) * 8; 464 if (!ino) 465 ino = 1; 466 #endif 467 return ino; 468 } 469 470 static inline int ceph_set_ino_cb(struct inode *inode, void *data) 471 { 472 ceph_inode(inode)->i_vino = *(struct ceph_vino *)data; 473 inode->i_ino = ceph_vino_to_ino(*(struct ceph_vino *)data); 474 return 0; 475 } 476 477 static inline struct ceph_vino ceph_vino(struct inode *inode) 478 { 479 return ceph_inode(inode)->i_vino; 480 } 481 482 /* for printf-style formatting */ 483 #define ceph_vinop(i) ceph_inode(i)->i_vino.ino, ceph_inode(i)->i_vino.snap 484 485 static inline u64 ceph_ino(struct inode *inode) 486 { 487 return ceph_inode(inode)->i_vino.ino; 488 } 489 static inline u64 ceph_snap(struct inode *inode) 490 { 491 return ceph_inode(inode)->i_vino.snap; 492 } 493 494 static inline int ceph_ino_compare(struct inode *inode, void *data) 495 { 496 struct ceph_vino *pvino = (struct ceph_vino *)data; 497 struct ceph_inode_info *ci = ceph_inode(inode); 498 return ci->i_vino.ino == pvino->ino && 499 ci->i_vino.snap == pvino->snap; 500 } 501 502 static inline struct inode *ceph_find_inode(struct super_block *sb, 503 struct ceph_vino vino) 504 { 505 ino_t t = ceph_vino_to_ino(vino); 506 return ilookup5(sb, t, ceph_ino_compare, &vino); 507 } 508 509 510 /* 511 * caps helpers 512 */ 513 static inline bool __ceph_is_any_real_caps(struct ceph_inode_info *ci) 514 { 515 return !RB_EMPTY_ROOT(&ci->i_caps); 516 } 517 518 extern int __ceph_caps_issued(struct ceph_inode_info *ci, int *implemented); 519 extern int __ceph_caps_issued_mask(struct ceph_inode_info *ci, int mask, int t); 520 extern int __ceph_caps_issued_other(struct ceph_inode_info *ci, 521 struct ceph_cap *cap); 522 523 static inline int ceph_caps_issued(struct ceph_inode_info *ci) 524 { 525 int issued; 526 spin_lock(&ci->vfs_inode.i_lock); 527 issued = __ceph_caps_issued(ci, NULL); 528 spin_unlock(&ci->vfs_inode.i_lock); 529 return issued; 530 } 531 532 static inline int ceph_caps_issued_mask(struct ceph_inode_info *ci, int mask, 533 int touch) 534 { 535 int r; 536 spin_lock(&ci->vfs_inode.i_lock); 537 r = __ceph_caps_issued_mask(ci, mask, touch); 538 spin_unlock(&ci->vfs_inode.i_lock); 539 return r; 540 } 541 542 static inline int __ceph_caps_dirty(struct ceph_inode_info *ci) 543 { 544 return ci->i_dirty_caps | ci->i_flushing_caps; 545 } 546 extern void __ceph_mark_dirty_caps(struct ceph_inode_info *ci, int mask); 547 548 extern int ceph_caps_revoking(struct ceph_inode_info *ci, int mask); 549 extern int __ceph_caps_used(struct ceph_inode_info *ci); 550 551 extern int __ceph_caps_file_wanted(struct ceph_inode_info *ci); 552 553 /* 554 * wanted, by virtue of open file modes AND cap refs (buffered/cached data) 555 */ 556 static inline int __ceph_caps_wanted(struct ceph_inode_info *ci) 557 { 558 int w = __ceph_caps_file_wanted(ci) | __ceph_caps_used(ci); 559 if (w & CEPH_CAP_FILE_BUFFER) 560 w |= CEPH_CAP_FILE_EXCL; /* we want EXCL if dirty data */ 561 return w; 562 } 563 564 /* what the mds thinks we want */ 565 extern int __ceph_caps_mds_wanted(struct ceph_inode_info *ci); 566 567 extern void ceph_caps_init(void); 568 extern void ceph_caps_finalize(void); 569 extern void ceph_adjust_min_caps(int delta); 570 extern int ceph_reserve_caps(struct ceph_cap_reservation *ctx, int need); 571 extern int ceph_unreserve_caps(struct ceph_cap_reservation *ctx); 572 extern void ceph_reservation_status(struct ceph_client *client, 573 int *total, int *avail, int *used, 574 int *reserved, int *min); 575 576 static inline struct ceph_client *ceph_inode_to_client(struct inode *inode) 577 { 578 return (struct ceph_client *)inode->i_sb->s_fs_info; 579 } 580 581 static inline struct ceph_client *ceph_sb_to_client(struct super_block *sb) 582 { 583 return (struct ceph_client *)sb->s_fs_info; 584 } 585 586 587 /* 588 * we keep buffered readdir results attached to file->private_data 589 */ 590 struct ceph_file_info { 591 int fmode; /* initialized on open */ 592 593 /* readdir: position within the dir */ 594 u32 frag; 595 struct ceph_mds_request *last_readdir; 596 int at_end; 597 598 /* readdir: position within a frag */ 599 unsigned offset; /* offset of last chunk, adjusted for . and .. */ 600 u64 next_offset; /* offset of next chunk (last_name's + 1) */ 601 char *last_name; /* last entry in previous chunk */ 602 struct dentry *dentry; /* next dentry (for dcache readdir) */ 603 unsigned long dir_release_count; 604 605 /* used for -o dirstat read() on directory thing */ 606 char *dir_info; 607 int dir_info_len; 608 }; 609 610 611 612 /* 613 * snapshots 614 */ 615 616 /* 617 * A "snap context" is the set of existing snapshots when we 618 * write data. It is used by the OSD to guide its COW behavior. 619 * 620 * The ceph_snap_context is refcounted, and attached to each dirty 621 * page, indicating which context the dirty data belonged when it was 622 * dirtied. 623 */ 624 struct ceph_snap_context { 625 atomic_t nref; 626 u64 seq; 627 int num_snaps; 628 u64 snaps[]; 629 }; 630 631 static inline struct ceph_snap_context * 632 ceph_get_snap_context(struct ceph_snap_context *sc) 633 { 634 /* 635 printk("get_snap_context %p %d -> %d\n", sc, atomic_read(&sc->nref), 636 atomic_read(&sc->nref)+1); 637 */ 638 if (sc) 639 atomic_inc(&sc->nref); 640 return sc; 641 } 642 643 static inline void ceph_put_snap_context(struct ceph_snap_context *sc) 644 { 645 if (!sc) 646 return; 647 /* 648 printk("put_snap_context %p %d -> %d\n", sc, atomic_read(&sc->nref), 649 atomic_read(&sc->nref)-1); 650 */ 651 if (atomic_dec_and_test(&sc->nref)) { 652 /*printk(" deleting snap_context %p\n", sc);*/ 653 kfree(sc); 654 } 655 } 656 657 /* 658 * A "snap realm" describes a subset of the file hierarchy sharing 659 * the same set of snapshots that apply to it. The realms themselves 660 * are organized into a hierarchy, such that children inherit (some of) 661 * the snapshots of their parents. 662 * 663 * All inodes within the realm that have capabilities are linked into a 664 * per-realm list. 665 */ 666 struct ceph_snap_realm { 667 u64 ino; 668 atomic_t nref; 669 struct rb_node node; 670 671 u64 created, seq; 672 u64 parent_ino; 673 u64 parent_since; /* snapid when our current parent became so */ 674 675 u64 *prior_parent_snaps; /* snaps inherited from any parents we */ 676 int num_prior_parent_snaps; /* had prior to parent_since */ 677 u64 *snaps; /* snaps specific to this realm */ 678 int num_snaps; 679 680 struct ceph_snap_realm *parent; 681 struct list_head children; /* list of child realms */ 682 struct list_head child_item; 683 684 struct list_head empty_item; /* if i have ref==0 */ 685 686 /* the current set of snaps for this realm */ 687 struct ceph_snap_context *cached_context; 688 689 struct list_head inodes_with_caps; 690 spinlock_t inodes_with_caps_lock; 691 }; 692 693 694 695 /* 696 * calculate the number of pages a given length and offset map onto, 697 * if we align the data. 698 */ 699 static inline int calc_pages_for(u64 off, u64 len) 700 { 701 return ((off+len+PAGE_CACHE_SIZE-1) >> PAGE_CACHE_SHIFT) - 702 (off >> PAGE_CACHE_SHIFT); 703 } 704 705 706 707 /* snap.c */ 708 struct ceph_snap_realm *ceph_lookup_snap_realm(struct ceph_mds_client *mdsc, 709 u64 ino); 710 extern void ceph_get_snap_realm(struct ceph_mds_client *mdsc, 711 struct ceph_snap_realm *realm); 712 extern void ceph_put_snap_realm(struct ceph_mds_client *mdsc, 713 struct ceph_snap_realm *realm); 714 extern int ceph_update_snap_trace(struct ceph_mds_client *m, 715 void *p, void *e, bool deletion); 716 extern void ceph_handle_snap(struct ceph_mds_client *mdsc, 717 struct ceph_mds_session *session, 718 struct ceph_msg *msg); 719 extern void ceph_queue_cap_snap(struct ceph_inode_info *ci); 720 extern int __ceph_finish_cap_snap(struct ceph_inode_info *ci, 721 struct ceph_cap_snap *capsnap); 722 extern void ceph_cleanup_empty_realms(struct ceph_mds_client *mdsc); 723 724 /* 725 * a cap_snap is "pending" if it is still awaiting an in-progress 726 * sync write (that may/may not still update size, mtime, etc.). 727 */ 728 static inline bool __ceph_have_pending_cap_snap(struct ceph_inode_info *ci) 729 { 730 return !list_empty(&ci->i_cap_snaps) && 731 list_entry(ci->i_cap_snaps.prev, struct ceph_cap_snap, 732 ci_item)->writing; 733 } 734 735 736 /* super.c */ 737 extern struct kmem_cache *ceph_inode_cachep; 738 extern struct kmem_cache *ceph_cap_cachep; 739 extern struct kmem_cache *ceph_dentry_cachep; 740 extern struct kmem_cache *ceph_file_cachep; 741 742 extern const char *ceph_msg_type_name(int type); 743 extern int ceph_check_fsid(struct ceph_client *client, struct ceph_fsid *fsid); 744 745 #define FSID_FORMAT "%02x%02x%02x%02x-%02x%02x-%02x%02x-%02x%02x-" \ 746 "%02x%02x%02x%02x%02x%02x" 747 #define PR_FSID(f) (f)->fsid[0], (f)->fsid[1], (f)->fsid[2], (f)->fsid[3], \ 748 (f)->fsid[4], (f)->fsid[5], (f)->fsid[6], (f)->fsid[7], \ 749 (f)->fsid[8], (f)->fsid[9], (f)->fsid[10], (f)->fsid[11], \ 750 (f)->fsid[12], (f)->fsid[13], (f)->fsid[14], (f)->fsid[15] 751 752 /* inode.c */ 753 extern const struct inode_operations ceph_file_iops; 754 755 extern struct inode *ceph_alloc_inode(struct super_block *sb); 756 extern void ceph_destroy_inode(struct inode *inode); 757 758 extern struct inode *ceph_get_inode(struct super_block *sb, 759 struct ceph_vino vino); 760 extern struct inode *ceph_get_snapdir(struct inode *parent); 761 extern int ceph_fill_file_size(struct inode *inode, int issued, 762 u32 truncate_seq, u64 truncate_size, u64 size); 763 extern void ceph_fill_file_time(struct inode *inode, int issued, 764 u64 time_warp_seq, struct timespec *ctime, 765 struct timespec *mtime, struct timespec *atime); 766 extern int ceph_fill_trace(struct super_block *sb, 767 struct ceph_mds_request *req, 768 struct ceph_mds_session *session); 769 extern int ceph_readdir_prepopulate(struct ceph_mds_request *req, 770 struct ceph_mds_session *session); 771 772 extern int ceph_inode_holds_cap(struct inode *inode, int mask); 773 774 extern int ceph_inode_set_size(struct inode *inode, loff_t size); 775 extern void __ceph_do_pending_vmtruncate(struct inode *inode); 776 extern void ceph_queue_vmtruncate(struct inode *inode); 777 778 extern void ceph_queue_invalidate(struct inode *inode); 779 extern void ceph_queue_writeback(struct inode *inode); 780 781 extern int ceph_do_getattr(struct inode *inode, int mask); 782 extern int ceph_permission(struct inode *inode, int mask); 783 extern int ceph_setattr(struct dentry *dentry, struct iattr *attr); 784 extern int ceph_getattr(struct vfsmount *mnt, struct dentry *dentry, 785 struct kstat *stat); 786 787 /* xattr.c */ 788 extern int ceph_setxattr(struct dentry *, const char *, const void *, 789 size_t, int); 790 extern ssize_t ceph_getxattr(struct dentry *, const char *, void *, size_t); 791 extern ssize_t ceph_listxattr(struct dentry *, char *, size_t); 792 extern int ceph_removexattr(struct dentry *, const char *); 793 extern void __ceph_build_xattrs_blob(struct ceph_inode_info *ci); 794 extern void __ceph_destroy_xattrs(struct ceph_inode_info *ci); 795 796 /* caps.c */ 797 extern const char *ceph_cap_string(int c); 798 extern void ceph_handle_caps(struct ceph_mds_session *session, 799 struct ceph_msg *msg); 800 extern int ceph_add_cap(struct inode *inode, 801 struct ceph_mds_session *session, u64 cap_id, 802 int fmode, unsigned issued, unsigned wanted, 803 unsigned cap, unsigned seq, u64 realmino, int flags, 804 struct ceph_cap_reservation *caps_reservation); 805 extern void __ceph_remove_cap(struct ceph_cap *cap); 806 static inline void ceph_remove_cap(struct ceph_cap *cap) 807 { 808 struct inode *inode = &cap->ci->vfs_inode; 809 spin_lock(&inode->i_lock); 810 __ceph_remove_cap(cap); 811 spin_unlock(&inode->i_lock); 812 } 813 extern void ceph_put_cap(struct ceph_cap *cap); 814 815 extern void ceph_queue_caps_release(struct inode *inode); 816 extern int ceph_write_inode(struct inode *inode, struct writeback_control *wbc); 817 extern int ceph_fsync(struct file *file, struct dentry *dentry, int datasync); 818 extern void ceph_kick_flushing_caps(struct ceph_mds_client *mdsc, 819 struct ceph_mds_session *session); 820 extern int ceph_get_cap_mds(struct inode *inode); 821 extern void ceph_get_cap_refs(struct ceph_inode_info *ci, int caps); 822 extern void ceph_put_cap_refs(struct ceph_inode_info *ci, int had); 823 extern void ceph_put_wrbuffer_cap_refs(struct ceph_inode_info *ci, int nr, 824 struct ceph_snap_context *snapc); 825 extern void __ceph_flush_snaps(struct ceph_inode_info *ci, 826 struct ceph_mds_session **psession); 827 extern void ceph_check_caps(struct ceph_inode_info *ci, int flags, 828 struct ceph_mds_session *session); 829 extern void ceph_check_delayed_caps(struct ceph_mds_client *mdsc); 830 extern void ceph_flush_dirty_caps(struct ceph_mds_client *mdsc); 831 832 extern int ceph_encode_inode_release(void **p, struct inode *inode, 833 int mds, int drop, int unless, int force); 834 extern int ceph_encode_dentry_release(void **p, struct dentry *dn, 835 int mds, int drop, int unless); 836 837 extern int ceph_get_caps(struct ceph_inode_info *ci, int need, int want, 838 int *got, loff_t endoff); 839 840 /* for counting open files by mode */ 841 static inline void __ceph_get_fmode(struct ceph_inode_info *ci, int mode) 842 { 843 ci->i_nr_by_mode[mode]++; 844 } 845 extern void ceph_put_fmode(struct ceph_inode_info *ci, int mode); 846 847 /* addr.c */ 848 extern const struct address_space_operations ceph_aops; 849 extern int ceph_mmap(struct file *file, struct vm_area_struct *vma); 850 851 /* file.c */ 852 extern const struct file_operations ceph_file_fops; 853 extern const struct address_space_operations ceph_aops; 854 extern int ceph_open(struct inode *inode, struct file *file); 855 extern struct dentry *ceph_lookup_open(struct inode *dir, struct dentry *dentry, 856 struct nameidata *nd, int mode, 857 int locked_dir); 858 extern int ceph_release(struct inode *inode, struct file *filp); 859 extern void ceph_release_page_vector(struct page **pages, int num_pages); 860 861 /* dir.c */ 862 extern const struct file_operations ceph_dir_fops; 863 extern const struct inode_operations ceph_dir_iops; 864 extern struct dentry_operations ceph_dentry_ops, ceph_snap_dentry_ops, 865 ceph_snapdir_dentry_ops; 866 867 extern int ceph_handle_notrace_create(struct inode *dir, struct dentry *dentry); 868 extern struct dentry *ceph_finish_lookup(struct ceph_mds_request *req, 869 struct dentry *dentry, int err); 870 871 extern void ceph_dentry_lru_add(struct dentry *dn); 872 extern void ceph_dentry_lru_touch(struct dentry *dn); 873 extern void ceph_dentry_lru_del(struct dentry *dn); 874 875 /* 876 * our d_ops vary depending on whether the inode is live, 877 * snapshotted (read-only), or a virtual ".snap" directory. 878 */ 879 int ceph_init_dentry(struct dentry *dentry); 880 881 882 /* ioctl.c */ 883 extern long ceph_ioctl(struct file *file, unsigned int cmd, unsigned long arg); 884 885 /* export.c */ 886 extern const struct export_operations ceph_export_ops; 887 888 /* debugfs.c */ 889 extern int ceph_debugfs_init(void); 890 extern void ceph_debugfs_cleanup(void); 891 extern int ceph_debugfs_client_init(struct ceph_client *client); 892 extern void ceph_debugfs_client_cleanup(struct ceph_client *client); 893 894 static inline struct inode *get_dentry_parent_inode(struct dentry *dentry) 895 { 896 if (dentry && dentry->d_parent) 897 return dentry->d_parent->d_inode; 898 899 return NULL; 900 } 901 902 #endif /* _FS_CEPH_SUPER_H */ 903