1 #ifndef _FS_CEPH_SUPER_H 2 #define _FS_CEPH_SUPER_H 3 4 #include <linux/ceph/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 #include <linux/posix_acl.h> 17 18 #include <linux/ceph/libceph.h> 19 20 #ifdef CONFIG_CEPH_FSCACHE 21 #include <linux/fscache.h> 22 #endif 23 24 /* f_type in struct statfs */ 25 #define CEPH_SUPER_MAGIC 0x00c36400 26 27 /* large granularity for statfs utilization stats to facilitate 28 * large volume sizes on 32-bit machines. */ 29 #define CEPH_BLOCK_SHIFT 22 /* 4 MB */ 30 #define CEPH_BLOCK (1 << CEPH_BLOCK_SHIFT) 31 32 #define CEPH_MOUNT_OPT_DIRSTAT (1<<4) /* `cat dirname` for stats */ 33 #define CEPH_MOUNT_OPT_RBYTES (1<<5) /* dir st_bytes = rbytes */ 34 #define CEPH_MOUNT_OPT_NOASYNCREADDIR (1<<7) /* no dcache readdir */ 35 #define CEPH_MOUNT_OPT_INO32 (1<<8) /* 32 bit inos */ 36 #define CEPH_MOUNT_OPT_DCACHE (1<<9) /* use dcache for readdir etc */ 37 #define CEPH_MOUNT_OPT_FSCACHE (1<<10) /* use fscache */ 38 #define CEPH_MOUNT_OPT_NOPOOLPERM (1<<11) /* no pool permission check */ 39 #define CEPH_MOUNT_OPT_MOUNTWAIT (1<<12) /* mount waits if no mds is up */ 40 41 #define CEPH_MOUNT_OPT_DEFAULT CEPH_MOUNT_OPT_DCACHE 42 43 #define ceph_set_mount_opt(fsc, opt) \ 44 (fsc)->mount_options->flags |= CEPH_MOUNT_OPT_##opt; 45 #define ceph_test_mount_opt(fsc, opt) \ 46 (!!((fsc)->mount_options->flags & CEPH_MOUNT_OPT_##opt)) 47 48 #define CEPH_RSIZE_DEFAULT (64*1024*1024) /* max read size */ 49 #define CEPH_RASIZE_DEFAULT (8192*1024) /* max readahead */ 50 #define CEPH_MAX_READDIR_DEFAULT 1024 51 #define CEPH_MAX_READDIR_BYTES_DEFAULT (512*1024) 52 #define CEPH_SNAPDIRNAME_DEFAULT ".snap" 53 54 struct ceph_mount_options { 55 int flags; 56 int sb_flags; 57 58 int wsize; /* max write size */ 59 int rsize; /* max read size */ 60 int rasize; /* max readahead */ 61 int congestion_kb; /* max writeback in flight */ 62 int caps_wanted_delay_min, caps_wanted_delay_max; 63 int cap_release_safety; 64 int max_readdir; /* max readdir result (entires) */ 65 int max_readdir_bytes; /* max readdir result (bytes) */ 66 67 /* 68 * everything above this point can be memcmp'd; everything below 69 * is handled in compare_mount_options() 70 */ 71 72 char *snapdir_name; /* default ".snap" */ 73 char *mds_namespace; /* default NULL */ 74 char *server_path; /* default "/" */ 75 }; 76 77 struct ceph_fs_client { 78 struct super_block *sb; 79 80 struct ceph_mount_options *mount_options; 81 struct ceph_client *client; 82 83 unsigned long mount_state; 84 int min_caps; /* min caps i added */ 85 86 struct ceph_mds_client *mdsc; 87 88 /* writeback */ 89 mempool_t *wb_pagevec_pool; 90 struct workqueue_struct *wb_wq; 91 struct workqueue_struct *pg_inv_wq; 92 struct workqueue_struct *trunc_wq; 93 atomic_long_t writeback_count; 94 95 struct backing_dev_info backing_dev_info; 96 97 #ifdef CONFIG_DEBUG_FS 98 struct dentry *debugfs_dentry_lru, *debugfs_caps; 99 struct dentry *debugfs_congestion_kb; 100 struct dentry *debugfs_bdi; 101 struct dentry *debugfs_mdsc, *debugfs_mdsmap; 102 struct dentry *debugfs_mds_sessions; 103 #endif 104 105 #ifdef CONFIG_CEPH_FSCACHE 106 struct fscache_cookie *fscache; 107 #endif 108 }; 109 110 111 /* 112 * File i/o capability. This tracks shared state with the metadata 113 * server that allows us to cache or writeback attributes or to read 114 * and write data. For any given inode, we should have one or more 115 * capabilities, one issued by each metadata server, and our 116 * cumulative access is the OR of all issued capabilities. 117 * 118 * Each cap is referenced by the inode's i_caps rbtree and by per-mds 119 * session capability lists. 120 */ 121 struct ceph_cap { 122 struct ceph_inode_info *ci; 123 struct rb_node ci_node; /* per-ci cap tree */ 124 struct ceph_mds_session *session; 125 struct list_head session_caps; /* per-session caplist */ 126 u64 cap_id; /* unique cap id (mds provided) */ 127 union { 128 /* in-use caps */ 129 struct { 130 int issued; /* latest, from the mds */ 131 int implemented; /* implemented superset of 132 issued (for revocation) */ 133 int mds, mds_wanted; 134 }; 135 /* caps to release */ 136 struct { 137 u64 cap_ino; 138 int queue_release; 139 }; 140 }; 141 u32 seq, issue_seq, mseq; 142 u32 cap_gen; /* active/stale cycle */ 143 unsigned long last_used; 144 struct list_head caps_item; 145 }; 146 147 #define CHECK_CAPS_NODELAY 1 /* do not delay any further */ 148 #define CHECK_CAPS_AUTHONLY 2 /* only check auth cap */ 149 #define CHECK_CAPS_FLUSH 4 /* flush any dirty caps */ 150 151 struct ceph_cap_flush { 152 u64 tid; 153 int caps; /* 0 means capsnap */ 154 bool wake; /* wake up flush waiters when finish ? */ 155 struct list_head g_list; // global 156 struct list_head i_list; // per inode 157 }; 158 159 /* 160 * Snapped cap state that is pending flush to mds. When a snapshot occurs, 161 * we first complete any in-process sync writes and writeback any dirty 162 * data before flushing the snapped state (tracked here) back to the MDS. 163 */ 164 struct ceph_cap_snap { 165 atomic_t nref; 166 struct list_head ci_item; 167 168 struct ceph_cap_flush cap_flush; 169 170 u64 follows; 171 int issued, dirty; 172 struct ceph_snap_context *context; 173 174 umode_t mode; 175 kuid_t uid; 176 kgid_t gid; 177 178 struct ceph_buffer *xattr_blob; 179 u64 xattr_version; 180 181 u64 size; 182 struct timespec mtime, atime, ctime; 183 u64 time_warp_seq; 184 u64 truncate_size; 185 u32 truncate_seq; 186 int writing; /* a sync write is still in progress */ 187 int dirty_pages; /* dirty pages awaiting writeback */ 188 bool inline_data; 189 bool need_flush; 190 }; 191 192 static inline void ceph_put_cap_snap(struct ceph_cap_snap *capsnap) 193 { 194 if (atomic_dec_and_test(&capsnap->nref)) { 195 if (capsnap->xattr_blob) 196 ceph_buffer_put(capsnap->xattr_blob); 197 kfree(capsnap); 198 } 199 } 200 201 /* 202 * The frag tree describes how a directory is fragmented, potentially across 203 * multiple metadata servers. It is also used to indicate points where 204 * metadata authority is delegated, and whether/where metadata is replicated. 205 * 206 * A _leaf_ frag will be present in the i_fragtree IFF there is 207 * delegation info. That is, if mds >= 0 || ndist > 0. 208 */ 209 #define CEPH_MAX_DIRFRAG_REP 4 210 211 struct ceph_inode_frag { 212 struct rb_node node; 213 214 /* fragtree state */ 215 u32 frag; 216 int split_by; /* i.e. 2^(split_by) children */ 217 218 /* delegation and replication info */ 219 int mds; /* -1 if same authority as parent */ 220 int ndist; /* >0 if replicated */ 221 int dist[CEPH_MAX_DIRFRAG_REP]; 222 }; 223 224 /* 225 * We cache inode xattrs as an encoded blob until they are first used, 226 * at which point we parse them into an rbtree. 227 */ 228 struct ceph_inode_xattr { 229 struct rb_node node; 230 231 const char *name; 232 int name_len; 233 const char *val; 234 int val_len; 235 int dirty; 236 237 int should_free_name; 238 int should_free_val; 239 }; 240 241 /* 242 * Ceph dentry state 243 */ 244 struct ceph_dentry_info { 245 struct ceph_mds_session *lease_session; 246 u32 lease_gen, lease_shared_gen; 247 u32 lease_seq; 248 unsigned long lease_renew_after, lease_renew_from; 249 struct list_head lru; 250 struct dentry *dentry; 251 unsigned long time; 252 u64 offset; 253 }; 254 255 struct ceph_inode_xattrs_info { 256 /* 257 * (still encoded) xattr blob. we avoid the overhead of parsing 258 * this until someone actually calls getxattr, etc. 259 * 260 * blob->vec.iov_len == 4 implies there are no xattrs; blob == 261 * NULL means we don't know. 262 */ 263 struct ceph_buffer *blob, *prealloc_blob; 264 265 struct rb_root index; 266 bool dirty; 267 int count; 268 int names_size; 269 int vals_size; 270 u64 version, index_version; 271 }; 272 273 /* 274 * Ceph inode. 275 */ 276 struct ceph_inode_info { 277 struct ceph_vino i_vino; /* ceph ino + snap */ 278 279 spinlock_t i_ceph_lock; 280 281 u64 i_version; 282 u64 i_inline_version; 283 u32 i_time_warp_seq; 284 285 unsigned i_ceph_flags; 286 atomic64_t i_release_count; 287 atomic64_t i_ordered_count; 288 atomic64_t i_complete_seq[2]; 289 290 struct ceph_dir_layout i_dir_layout; 291 struct ceph_file_layout i_layout; 292 char *i_symlink; 293 294 /* for dirs */ 295 struct timespec i_rctime; 296 u64 i_rbytes, i_rfiles, i_rsubdirs; 297 u64 i_files, i_subdirs; 298 299 struct rb_root i_fragtree; 300 int i_fragtree_nsplits; 301 struct mutex i_fragtree_mutex; 302 303 struct ceph_inode_xattrs_info i_xattrs; 304 305 /* capabilities. protected _both_ by i_ceph_lock and cap->session's 306 * s_mutex. */ 307 struct rb_root i_caps; /* cap list */ 308 struct ceph_cap *i_auth_cap; /* authoritative cap, if any */ 309 unsigned i_dirty_caps, i_flushing_caps; /* mask of dirtied fields */ 310 struct list_head i_dirty_item, i_flushing_item; 311 /* we need to track cap writeback on a per-cap-bit basis, to allow 312 * overlapping, pipelined cap flushes to the mds. we can probably 313 * reduce the tid to 8 bits if we're concerned about inode size. */ 314 struct ceph_cap_flush *i_prealloc_cap_flush; 315 struct list_head i_cap_flush_list; 316 wait_queue_head_t i_cap_wq; /* threads waiting on a capability */ 317 unsigned long i_hold_caps_min; /* jiffies */ 318 unsigned long i_hold_caps_max; /* jiffies */ 319 struct list_head i_cap_delay_list; /* for delayed cap release to mds */ 320 struct ceph_cap_reservation i_cap_migration_resv; 321 struct list_head i_cap_snaps; /* snapped state pending flush to mds */ 322 struct ceph_snap_context *i_head_snapc; /* set if wr_buffer_head > 0 or 323 dirty|flushing caps */ 324 unsigned i_snap_caps; /* cap bits for snapped files */ 325 326 int i_nr_by_mode[CEPH_FILE_MODE_BITS]; /* open file counts */ 327 328 struct mutex i_truncate_mutex; 329 u32 i_truncate_seq; /* last truncate to smaller size */ 330 u64 i_truncate_size; /* and the size we last truncated down to */ 331 int i_truncate_pending; /* still need to call vmtruncate */ 332 333 u64 i_max_size; /* max file size authorized by mds */ 334 u64 i_reported_size; /* (max_)size reported to or requested of mds */ 335 u64 i_wanted_max_size; /* offset we'd like to write too */ 336 u64 i_requested_max_size; /* max_size we've requested */ 337 338 /* held references to caps */ 339 int i_pin_ref; 340 int i_rd_ref, i_rdcache_ref, i_wr_ref, i_wb_ref; 341 int i_wrbuffer_ref, i_wrbuffer_ref_head; 342 u32 i_shared_gen; /* increment each time we get FILE_SHARED */ 343 u32 i_rdcache_gen; /* incremented each time we get FILE_CACHE. */ 344 u32 i_rdcache_revoking; /* RDCACHE gen to async invalidate, if any */ 345 346 struct list_head i_unsafe_dirops; /* uncommitted mds dir ops */ 347 struct list_head i_unsafe_iops; /* uncommitted mds inode ops */ 348 spinlock_t i_unsafe_lock; 349 350 struct ceph_snap_realm *i_snap_realm; /* snap realm (if caps) */ 351 int i_snap_realm_counter; /* snap realm (if caps) */ 352 struct list_head i_snap_realm_item; 353 struct list_head i_snap_flush_item; 354 355 struct work_struct i_wb_work; /* writeback work */ 356 struct work_struct i_pg_inv_work; /* page invalidation work */ 357 358 struct work_struct i_vmtruncate_work; 359 360 #ifdef CONFIG_CEPH_FSCACHE 361 struct fscache_cookie *fscache; 362 u32 i_fscache_gen; 363 #endif 364 struct inode vfs_inode; /* at end */ 365 }; 366 367 static inline struct ceph_inode_info *ceph_inode(struct inode *inode) 368 { 369 return container_of(inode, struct ceph_inode_info, vfs_inode); 370 } 371 372 static inline struct ceph_fs_client *ceph_inode_to_client(struct inode *inode) 373 { 374 return (struct ceph_fs_client *)inode->i_sb->s_fs_info; 375 } 376 377 static inline struct ceph_fs_client *ceph_sb_to_client(struct super_block *sb) 378 { 379 return (struct ceph_fs_client *)sb->s_fs_info; 380 } 381 382 static inline struct ceph_vino ceph_vino(struct inode *inode) 383 { 384 return ceph_inode(inode)->i_vino; 385 } 386 387 /* 388 * ino_t is <64 bits on many architectures, blech. 389 * 390 * i_ino (kernel inode) st_ino (userspace) 391 * i386 32 32 392 * x86_64+ino32 64 32 393 * x86_64 64 64 394 */ 395 static inline u32 ceph_ino_to_ino32(__u64 vino) 396 { 397 u32 ino = vino & 0xffffffff; 398 ino ^= vino >> 32; 399 if (!ino) 400 ino = 2; 401 return ino; 402 } 403 404 /* 405 * kernel i_ino value 406 */ 407 static inline ino_t ceph_vino_to_ino(struct ceph_vino vino) 408 { 409 #if BITS_PER_LONG == 32 410 return ceph_ino_to_ino32(vino.ino); 411 #else 412 return (ino_t)vino.ino; 413 #endif 414 } 415 416 /* 417 * user-visible ino (stat, filldir) 418 */ 419 #if BITS_PER_LONG == 32 420 static inline ino_t ceph_translate_ino(struct super_block *sb, ino_t ino) 421 { 422 return ino; 423 } 424 #else 425 static inline ino_t ceph_translate_ino(struct super_block *sb, ino_t ino) 426 { 427 if (ceph_test_mount_opt(ceph_sb_to_client(sb), INO32)) 428 ino = ceph_ino_to_ino32(ino); 429 return ino; 430 } 431 #endif 432 433 434 /* for printf-style formatting */ 435 #define ceph_vinop(i) ceph_inode(i)->i_vino.ino, ceph_inode(i)->i_vino.snap 436 437 static inline u64 ceph_ino(struct inode *inode) 438 { 439 return ceph_inode(inode)->i_vino.ino; 440 } 441 static inline u64 ceph_snap(struct inode *inode) 442 { 443 return ceph_inode(inode)->i_vino.snap; 444 } 445 446 static inline int ceph_ino_compare(struct inode *inode, void *data) 447 { 448 struct ceph_vino *pvino = (struct ceph_vino *)data; 449 struct ceph_inode_info *ci = ceph_inode(inode); 450 return ci->i_vino.ino == pvino->ino && 451 ci->i_vino.snap == pvino->snap; 452 } 453 454 static inline struct inode *ceph_find_inode(struct super_block *sb, 455 struct ceph_vino vino) 456 { 457 ino_t t = ceph_vino_to_ino(vino); 458 return ilookup5(sb, t, ceph_ino_compare, &vino); 459 } 460 461 462 /* 463 * Ceph inode. 464 */ 465 #define CEPH_I_DIR_ORDERED (1 << 0) /* dentries in dir are ordered */ 466 #define CEPH_I_NODELAY (1 << 1) /* do not delay cap release */ 467 #define CEPH_I_FLUSH (1 << 2) /* do not delay flush of dirty metadata */ 468 #define CEPH_I_NOFLUSH (1 << 3) /* do not flush dirty caps */ 469 #define CEPH_I_POOL_PERM (1 << 4) /* pool rd/wr bits are valid */ 470 #define CEPH_I_POOL_RD (1 << 5) /* can read from pool */ 471 #define CEPH_I_POOL_WR (1 << 6) /* can write to pool */ 472 #define CEPH_I_SEC_INITED (1 << 7) /* security initialized */ 473 #define CEPH_I_CAP_DROPPED (1 << 8) /* caps were forcibly dropped */ 474 #define CEPH_I_KICK_FLUSH (1 << 9) /* kick flushing caps */ 475 #define CEPH_I_FLUSH_SNAPS (1 << 10) /* need flush snapss */ 476 477 static inline void __ceph_dir_set_complete(struct ceph_inode_info *ci, 478 long long release_count, 479 long long ordered_count) 480 { 481 smp_mb__before_atomic(); 482 atomic64_set(&ci->i_complete_seq[0], release_count); 483 atomic64_set(&ci->i_complete_seq[1], ordered_count); 484 } 485 486 static inline void __ceph_dir_clear_complete(struct ceph_inode_info *ci) 487 { 488 atomic64_inc(&ci->i_release_count); 489 } 490 491 static inline void __ceph_dir_clear_ordered(struct ceph_inode_info *ci) 492 { 493 atomic64_inc(&ci->i_ordered_count); 494 } 495 496 static inline bool __ceph_dir_is_complete(struct ceph_inode_info *ci) 497 { 498 return atomic64_read(&ci->i_complete_seq[0]) == 499 atomic64_read(&ci->i_release_count); 500 } 501 502 static inline bool __ceph_dir_is_complete_ordered(struct ceph_inode_info *ci) 503 { 504 return atomic64_read(&ci->i_complete_seq[0]) == 505 atomic64_read(&ci->i_release_count) && 506 atomic64_read(&ci->i_complete_seq[1]) == 507 atomic64_read(&ci->i_ordered_count); 508 } 509 510 static inline void ceph_dir_clear_complete(struct inode *inode) 511 { 512 __ceph_dir_clear_complete(ceph_inode(inode)); 513 } 514 515 static inline void ceph_dir_clear_ordered(struct inode *inode) 516 { 517 __ceph_dir_clear_ordered(ceph_inode(inode)); 518 } 519 520 static inline bool ceph_dir_is_complete_ordered(struct inode *inode) 521 { 522 bool ret = __ceph_dir_is_complete_ordered(ceph_inode(inode)); 523 smp_rmb(); 524 return ret; 525 } 526 527 /* find a specific frag @f */ 528 extern struct ceph_inode_frag *__ceph_find_frag(struct ceph_inode_info *ci, 529 u32 f); 530 531 /* 532 * choose fragment for value @v. copy frag content to pfrag, if leaf 533 * exists 534 */ 535 extern u32 ceph_choose_frag(struct ceph_inode_info *ci, u32 v, 536 struct ceph_inode_frag *pfrag, 537 int *found); 538 539 static inline struct ceph_dentry_info *ceph_dentry(struct dentry *dentry) 540 { 541 return (struct ceph_dentry_info *)dentry->d_fsdata; 542 } 543 544 /* 545 * caps helpers 546 */ 547 static inline bool __ceph_is_any_real_caps(struct ceph_inode_info *ci) 548 { 549 return !RB_EMPTY_ROOT(&ci->i_caps); 550 } 551 552 extern int __ceph_caps_issued(struct ceph_inode_info *ci, int *implemented); 553 extern int __ceph_caps_issued_mask(struct ceph_inode_info *ci, int mask, int t); 554 extern int __ceph_caps_issued_other(struct ceph_inode_info *ci, 555 struct ceph_cap *cap); 556 557 static inline int ceph_caps_issued(struct ceph_inode_info *ci) 558 { 559 int issued; 560 spin_lock(&ci->i_ceph_lock); 561 issued = __ceph_caps_issued(ci, NULL); 562 spin_unlock(&ci->i_ceph_lock); 563 return issued; 564 } 565 566 static inline int ceph_caps_issued_mask(struct ceph_inode_info *ci, int mask, 567 int touch) 568 { 569 int r; 570 spin_lock(&ci->i_ceph_lock); 571 r = __ceph_caps_issued_mask(ci, mask, touch); 572 spin_unlock(&ci->i_ceph_lock); 573 return r; 574 } 575 576 static inline int __ceph_caps_dirty(struct ceph_inode_info *ci) 577 { 578 return ci->i_dirty_caps | ci->i_flushing_caps; 579 } 580 extern struct ceph_cap_flush *ceph_alloc_cap_flush(void); 581 extern void ceph_free_cap_flush(struct ceph_cap_flush *cf); 582 extern int __ceph_mark_dirty_caps(struct ceph_inode_info *ci, int mask, 583 struct ceph_cap_flush **pcf); 584 585 extern int __ceph_caps_revoking_other(struct ceph_inode_info *ci, 586 struct ceph_cap *ocap, int mask); 587 extern int ceph_caps_revoking(struct ceph_inode_info *ci, int mask); 588 extern int __ceph_caps_used(struct ceph_inode_info *ci); 589 590 extern int __ceph_caps_file_wanted(struct ceph_inode_info *ci); 591 592 /* 593 * wanted, by virtue of open file modes AND cap refs (buffered/cached data) 594 */ 595 static inline int __ceph_caps_wanted(struct ceph_inode_info *ci) 596 { 597 int w = __ceph_caps_file_wanted(ci) | __ceph_caps_used(ci); 598 if (w & CEPH_CAP_FILE_BUFFER) 599 w |= CEPH_CAP_FILE_EXCL; /* we want EXCL if dirty data */ 600 return w; 601 } 602 603 /* what the mds thinks we want */ 604 extern int __ceph_caps_mds_wanted(struct ceph_inode_info *ci, bool check); 605 606 extern void ceph_caps_init(struct ceph_mds_client *mdsc); 607 extern void ceph_caps_finalize(struct ceph_mds_client *mdsc); 608 extern void ceph_adjust_min_caps(struct ceph_mds_client *mdsc, int delta); 609 extern void ceph_reserve_caps(struct ceph_mds_client *mdsc, 610 struct ceph_cap_reservation *ctx, int need); 611 extern int ceph_unreserve_caps(struct ceph_mds_client *mdsc, 612 struct ceph_cap_reservation *ctx); 613 extern void ceph_reservation_status(struct ceph_fs_client *client, 614 int *total, int *avail, int *used, 615 int *reserved, int *min); 616 617 618 619 /* 620 * we keep buffered readdir results attached to file->private_data 621 */ 622 #define CEPH_F_SYNC 1 623 #define CEPH_F_ATEND 2 624 625 struct ceph_file_info { 626 short fmode; /* initialized on open */ 627 short flags; /* CEPH_F_* */ 628 629 /* readdir: position within the dir */ 630 u32 frag; 631 struct ceph_mds_request *last_readdir; 632 633 /* readdir: position within a frag */ 634 unsigned next_offset; /* offset of next chunk (last_name's + 1) */ 635 char *last_name; /* last entry in previous chunk */ 636 long long dir_release_count; 637 long long dir_ordered_count; 638 int readdir_cache_idx; 639 640 /* used for -o dirstat read() on directory thing */ 641 char *dir_info; 642 int dir_info_len; 643 }; 644 645 struct ceph_readdir_cache_control { 646 struct page *page; 647 struct dentry **dentries; 648 int index; 649 }; 650 651 /* 652 * A "snap realm" describes a subset of the file hierarchy sharing 653 * the same set of snapshots that apply to it. The realms themselves 654 * are organized into a hierarchy, such that children inherit (some of) 655 * the snapshots of their parents. 656 * 657 * All inodes within the realm that have capabilities are linked into a 658 * per-realm list. 659 */ 660 struct ceph_snap_realm { 661 u64 ino; 662 atomic_t nref; 663 struct rb_node node; 664 665 u64 created, seq; 666 u64 parent_ino; 667 u64 parent_since; /* snapid when our current parent became so */ 668 669 u64 *prior_parent_snaps; /* snaps inherited from any parents we */ 670 u32 num_prior_parent_snaps; /* had prior to parent_since */ 671 u64 *snaps; /* snaps specific to this realm */ 672 u32 num_snaps; 673 674 struct ceph_snap_realm *parent; 675 struct list_head children; /* list of child realms */ 676 struct list_head child_item; 677 678 struct list_head empty_item; /* if i have ref==0 */ 679 680 struct list_head dirty_item; /* if realm needs new context */ 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 static inline int default_congestion_kb(void) 690 { 691 int congestion_kb; 692 693 /* 694 * Copied from NFS 695 * 696 * congestion size, scale with available memory. 697 * 698 * 64MB: 8192k 699 * 128MB: 11585k 700 * 256MB: 16384k 701 * 512MB: 23170k 702 * 1GB: 32768k 703 * 2GB: 46340k 704 * 4GB: 65536k 705 * 8GB: 92681k 706 * 16GB: 131072k 707 * 708 * This allows larger machines to have larger/more transfers. 709 * Limit the default to 256M 710 */ 711 congestion_kb = (16*int_sqrt(totalram_pages)) << (PAGE_SHIFT-10); 712 if (congestion_kb > 256*1024) 713 congestion_kb = 256*1024; 714 715 return congestion_kb; 716 } 717 718 719 720 /* snap.c */ 721 struct ceph_snap_realm *ceph_lookup_snap_realm(struct ceph_mds_client *mdsc, 722 u64 ino); 723 extern void ceph_get_snap_realm(struct ceph_mds_client *mdsc, 724 struct ceph_snap_realm *realm); 725 extern void ceph_put_snap_realm(struct ceph_mds_client *mdsc, 726 struct ceph_snap_realm *realm); 727 extern int ceph_update_snap_trace(struct ceph_mds_client *m, 728 void *p, void *e, bool deletion, 729 struct ceph_snap_realm **realm_ret); 730 extern void ceph_handle_snap(struct ceph_mds_client *mdsc, 731 struct ceph_mds_session *session, 732 struct ceph_msg *msg); 733 extern void ceph_queue_cap_snap(struct ceph_inode_info *ci); 734 extern int __ceph_finish_cap_snap(struct ceph_inode_info *ci, 735 struct ceph_cap_snap *capsnap); 736 extern void ceph_cleanup_empty_realms(struct ceph_mds_client *mdsc); 737 738 /* 739 * a cap_snap is "pending" if it is still awaiting an in-progress 740 * sync write (that may/may not still update size, mtime, etc.). 741 */ 742 static inline bool __ceph_have_pending_cap_snap(struct ceph_inode_info *ci) 743 { 744 return !list_empty(&ci->i_cap_snaps) && 745 list_last_entry(&ci->i_cap_snaps, struct ceph_cap_snap, 746 ci_item)->writing; 747 } 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 extern int ceph_drop_inode(struct inode *inode); 755 756 extern struct inode *ceph_get_inode(struct super_block *sb, 757 struct ceph_vino vino); 758 extern struct inode *ceph_get_snapdir(struct inode *parent); 759 extern int ceph_fill_file_size(struct inode *inode, int issued, 760 u32 truncate_seq, u64 truncate_size, u64 size); 761 extern void ceph_fill_file_time(struct inode *inode, int issued, 762 u64 time_warp_seq, struct timespec *ctime, 763 struct timespec *mtime, struct timespec *atime); 764 extern int ceph_fill_trace(struct super_block *sb, 765 struct ceph_mds_request *req); 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, struct page *locked_page, 779 int mask, bool force); 780 static inline int ceph_do_getattr(struct inode *inode, int mask, bool force) 781 { 782 return __ceph_do_getattr(inode, NULL, mask, force); 783 } 784 extern int ceph_permission(struct inode *inode, int mask); 785 extern int __ceph_setattr(struct inode *inode, struct iattr *attr); 786 extern int ceph_setattr(struct dentry *dentry, struct iattr *attr); 787 extern int ceph_getattr(const struct path *path, struct kstat *stat, 788 u32 request_mask, unsigned int flags); 789 790 /* xattr.c */ 791 int __ceph_setxattr(struct inode *, const char *, const void *, size_t, int); 792 ssize_t __ceph_getxattr(struct inode *, const char *, void *, size_t); 793 extern ssize_t ceph_listxattr(struct dentry *, char *, size_t); 794 extern void __ceph_build_xattrs_blob(struct ceph_inode_info *ci); 795 extern void __ceph_destroy_xattrs(struct ceph_inode_info *ci); 796 extern void __init ceph_xattr_init(void); 797 extern void ceph_xattr_exit(void); 798 extern const struct xattr_handler *ceph_xattr_handlers[]; 799 800 #ifdef CONFIG_SECURITY 801 extern bool ceph_security_xattr_deadlock(struct inode *in); 802 extern bool ceph_security_xattr_wanted(struct inode *in); 803 #else 804 static inline bool ceph_security_xattr_deadlock(struct inode *in) 805 { 806 return false; 807 } 808 static inline bool ceph_security_xattr_wanted(struct inode *in) 809 { 810 return false; 811 } 812 #endif 813 814 /* acl.c */ 815 struct ceph_acls_info { 816 void *default_acl; 817 void *acl; 818 struct ceph_pagelist *pagelist; 819 }; 820 821 #ifdef CONFIG_CEPH_FS_POSIX_ACL 822 823 struct posix_acl *ceph_get_acl(struct inode *, int); 824 int ceph_set_acl(struct inode *inode, struct posix_acl *acl, int type); 825 int ceph_pre_init_acls(struct inode *dir, umode_t *mode, 826 struct ceph_acls_info *info); 827 void ceph_init_inode_acls(struct inode *inode, struct ceph_acls_info *info); 828 void ceph_release_acls_info(struct ceph_acls_info *info); 829 830 static inline void ceph_forget_all_cached_acls(struct inode *inode) 831 { 832 forget_all_cached_acls(inode); 833 } 834 835 #else 836 837 #define ceph_get_acl NULL 838 #define ceph_set_acl NULL 839 840 static inline int ceph_pre_init_acls(struct inode *dir, umode_t *mode, 841 struct ceph_acls_info *info) 842 { 843 return 0; 844 } 845 static inline void ceph_init_inode_acls(struct inode *inode, 846 struct ceph_acls_info *info) 847 { 848 } 849 static inline void ceph_release_acls_info(struct ceph_acls_info *info) 850 { 851 } 852 static inline int ceph_acl_chmod(struct dentry *dentry, struct inode *inode) 853 { 854 return 0; 855 } 856 857 static inline void ceph_forget_all_cached_acls(struct inode *inode) 858 { 859 } 860 861 #endif 862 863 /* caps.c */ 864 extern const char *ceph_cap_string(int c); 865 extern void ceph_handle_caps(struct ceph_mds_session *session, 866 struct ceph_msg *msg); 867 extern struct ceph_cap *ceph_get_cap(struct ceph_mds_client *mdsc, 868 struct ceph_cap_reservation *ctx); 869 extern void ceph_add_cap(struct inode *inode, 870 struct ceph_mds_session *session, u64 cap_id, 871 int fmode, unsigned issued, unsigned wanted, 872 unsigned cap, unsigned seq, u64 realmino, int flags, 873 struct ceph_cap **new_cap); 874 extern void __ceph_remove_cap(struct ceph_cap *cap, bool queue_release); 875 extern void ceph_put_cap(struct ceph_mds_client *mdsc, 876 struct ceph_cap *cap); 877 extern int ceph_is_any_caps(struct inode *inode); 878 879 extern void ceph_queue_caps_release(struct inode *inode); 880 extern int ceph_write_inode(struct inode *inode, struct writeback_control *wbc); 881 extern int ceph_fsync(struct file *file, loff_t start, loff_t end, 882 int datasync); 883 extern void ceph_early_kick_flushing_caps(struct ceph_mds_client *mdsc, 884 struct ceph_mds_session *session); 885 extern void ceph_kick_flushing_caps(struct ceph_mds_client *mdsc, 886 struct ceph_mds_session *session); 887 extern struct ceph_cap *ceph_get_cap_for_mds(struct ceph_inode_info *ci, 888 int mds); 889 extern int ceph_get_cap_mds(struct inode *inode); 890 extern void ceph_get_cap_refs(struct ceph_inode_info *ci, int caps); 891 extern void ceph_put_cap_refs(struct ceph_inode_info *ci, int had); 892 extern void ceph_put_wrbuffer_cap_refs(struct ceph_inode_info *ci, int nr, 893 struct ceph_snap_context *snapc); 894 extern void ceph_flush_snaps(struct ceph_inode_info *ci, 895 struct ceph_mds_session **psession); 896 extern void ceph_check_caps(struct ceph_inode_info *ci, int flags, 897 struct ceph_mds_session *session); 898 extern void ceph_check_delayed_caps(struct ceph_mds_client *mdsc); 899 extern void ceph_flush_dirty_caps(struct ceph_mds_client *mdsc); 900 901 extern int ceph_encode_inode_release(void **p, struct inode *inode, 902 int mds, int drop, int unless, int force); 903 extern int ceph_encode_dentry_release(void **p, struct dentry *dn, 904 struct inode *dir, 905 int mds, int drop, int unless); 906 907 extern int ceph_get_caps(struct ceph_inode_info *ci, int need, int want, 908 loff_t endoff, int *got, struct page **pinned_page); 909 extern int ceph_try_get_caps(struct ceph_inode_info *ci, 910 int need, int want, int *got); 911 912 /* for counting open files by mode */ 913 extern void __ceph_get_fmode(struct ceph_inode_info *ci, int mode); 914 extern void ceph_put_fmode(struct ceph_inode_info *ci, int mode); 915 916 /* addr.c */ 917 extern const struct address_space_operations ceph_aops; 918 extern int ceph_mmap(struct file *file, struct vm_area_struct *vma); 919 extern int ceph_uninline_data(struct file *filp, struct page *locked_page); 920 extern int ceph_pool_perm_check(struct ceph_inode_info *ci, int need); 921 extern void ceph_pool_perm_destroy(struct ceph_mds_client* mdsc); 922 923 /* file.c */ 924 extern const struct file_operations ceph_file_fops; 925 926 extern int ceph_renew_caps(struct inode *inode); 927 extern int ceph_open(struct inode *inode, struct file *file); 928 extern int ceph_atomic_open(struct inode *dir, struct dentry *dentry, 929 struct file *file, unsigned flags, umode_t mode, 930 int *opened); 931 extern int ceph_release(struct inode *inode, struct file *filp); 932 extern void ceph_fill_inline_data(struct inode *inode, struct page *locked_page, 933 char *data, size_t len); 934 935 /* dir.c */ 936 extern const struct file_operations ceph_dir_fops; 937 extern const struct file_operations ceph_snapdir_fops; 938 extern const struct inode_operations ceph_dir_iops; 939 extern const struct inode_operations ceph_snapdir_iops; 940 extern const struct dentry_operations ceph_dentry_ops; 941 942 extern loff_t ceph_make_fpos(unsigned high, unsigned off, bool hash_order); 943 extern int ceph_handle_notrace_create(struct inode *dir, struct dentry *dentry); 944 extern int ceph_handle_snapdir(struct ceph_mds_request *req, 945 struct dentry *dentry, int err); 946 extern struct dentry *ceph_finish_lookup(struct ceph_mds_request *req, 947 struct dentry *dentry, int err); 948 949 extern void ceph_dentry_lru_add(struct dentry *dn); 950 extern void ceph_dentry_lru_touch(struct dentry *dn); 951 extern void ceph_dentry_lru_del(struct dentry *dn); 952 extern void ceph_invalidate_dentry_lease(struct dentry *dentry); 953 extern unsigned ceph_dentry_hash(struct inode *dir, struct dentry *dn); 954 extern void ceph_readdir_cache_release(struct ceph_readdir_cache_control *ctl); 955 956 /* ioctl.c */ 957 extern long ceph_ioctl(struct file *file, unsigned int cmd, unsigned long arg); 958 959 /* export.c */ 960 extern const struct export_operations ceph_export_ops; 961 962 /* locks.c */ 963 extern __init void ceph_flock_init(void); 964 extern int ceph_lock(struct file *file, int cmd, struct file_lock *fl); 965 extern int ceph_flock(struct file *file, int cmd, struct file_lock *fl); 966 extern void ceph_count_locks(struct inode *inode, int *p_num, int *f_num); 967 extern int ceph_encode_locks_to_buffer(struct inode *inode, 968 struct ceph_filelock *flocks, 969 int num_fcntl_locks, 970 int num_flock_locks); 971 extern int ceph_locks_to_pagelist(struct ceph_filelock *flocks, 972 struct ceph_pagelist *pagelist, 973 int num_fcntl_locks, int num_flock_locks); 974 extern int lock_to_ceph_filelock(struct file_lock *fl, struct ceph_filelock *c); 975 976 /* debugfs.c */ 977 extern int ceph_fs_debugfs_init(struct ceph_fs_client *client); 978 extern void ceph_fs_debugfs_cleanup(struct ceph_fs_client *client); 979 980 #endif /* _FS_CEPH_SUPER_H */ 981