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