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 #include <linux/refcount.h> 18 19 #include <linux/ceph/libceph.h> 20 21 #ifdef CONFIG_CEPH_FSCACHE 22 #include <linux/fscache.h> 23 #endif 24 25 /* f_type in struct statfs */ 26 #define CEPH_SUPER_MAGIC 0x00c36400 27 28 /* large granularity for statfs utilization stats to facilitate 29 * large volume sizes on 32-bit machines. */ 30 #define CEPH_BLOCK_SHIFT 22 /* 4 MB */ 31 #define CEPH_BLOCK (1 << CEPH_BLOCK_SHIFT) 32 33 #define CEPH_MOUNT_OPT_DIRSTAT (1<<4) /* `cat dirname` for stats */ 34 #define CEPH_MOUNT_OPT_RBYTES (1<<5) /* dir st_bytes = rbytes */ 35 #define CEPH_MOUNT_OPT_NOASYNCREADDIR (1<<7) /* no dcache readdir */ 36 #define CEPH_MOUNT_OPT_INO32 (1<<8) /* 32 bit inos */ 37 #define CEPH_MOUNT_OPT_DCACHE (1<<9) /* use dcache for readdir etc */ 38 #define CEPH_MOUNT_OPT_FSCACHE (1<<10) /* use fscache */ 39 #define CEPH_MOUNT_OPT_NOPOOLPERM (1<<11) /* no pool permission check */ 40 #define CEPH_MOUNT_OPT_MOUNTWAIT (1<<12) /* mount waits if no mds is up */ 41 42 #define CEPH_MOUNT_OPT_DEFAULT CEPH_MOUNT_OPT_DCACHE 43 44 #define ceph_set_mount_opt(fsc, opt) \ 45 (fsc)->mount_options->flags |= CEPH_MOUNT_OPT_##opt; 46 #define ceph_test_mount_opt(fsc, opt) \ 47 (!!((fsc)->mount_options->flags & CEPH_MOUNT_OPT_##opt)) 48 49 /* max size of osd read request, limited by libceph */ 50 #define CEPH_MAX_READ_SIZE CEPH_MSG_MAX_DATA_LEN 51 /* osd has a configurable limitaion of max write size. 52 * CEPH_MSG_MAX_DATA_LEN should be small enough. */ 53 #define CEPH_MAX_WRITE_SIZE CEPH_MSG_MAX_DATA_LEN 54 #define CEPH_RASIZE_DEFAULT (8192*1024) /* max readahead */ 55 #define CEPH_MAX_READDIR_DEFAULT 1024 56 #define CEPH_MAX_READDIR_BYTES_DEFAULT (512*1024) 57 #define CEPH_SNAPDIRNAME_DEFAULT ".snap" 58 59 /* 60 * Delay telling the MDS we no longer want caps, in case we reopen 61 * the file. Delay a minimum amount of time, even if we send a cap 62 * message for some other reason. Otherwise, take the oppotunity to 63 * update the mds to avoid sending another message later. 64 */ 65 #define CEPH_CAPS_WANTED_DELAY_MIN_DEFAULT 5 /* cap release delay */ 66 #define CEPH_CAPS_WANTED_DELAY_MAX_DEFAULT 60 /* cap release delay */ 67 68 struct ceph_mount_options { 69 int flags; 70 int sb_flags; 71 72 int wsize; /* max write size */ 73 int rsize; /* max read size */ 74 int rasize; /* max readahead */ 75 int congestion_kb; /* max writeback in flight */ 76 int caps_wanted_delay_min, caps_wanted_delay_max; 77 int max_readdir; /* max readdir result (entires) */ 78 int max_readdir_bytes; /* max readdir result (bytes) */ 79 80 /* 81 * everything above this point can be memcmp'd; everything below 82 * is handled in compare_mount_options() 83 */ 84 85 char *snapdir_name; /* default ".snap" */ 86 char *mds_namespace; /* default NULL */ 87 char *server_path; /* default "/" */ 88 char *fscache_uniq; /* default NULL */ 89 }; 90 91 struct ceph_fs_client { 92 struct super_block *sb; 93 94 struct ceph_mount_options *mount_options; 95 struct ceph_client *client; 96 97 unsigned long mount_state; 98 int min_caps; /* min caps i added */ 99 100 struct ceph_mds_client *mdsc; 101 102 /* writeback */ 103 mempool_t *wb_pagevec_pool; 104 struct workqueue_struct *wb_wq; 105 struct workqueue_struct *pg_inv_wq; 106 struct workqueue_struct *trunc_wq; 107 atomic_long_t writeback_count; 108 109 #ifdef CONFIG_DEBUG_FS 110 struct dentry *debugfs_dentry_lru, *debugfs_caps; 111 struct dentry *debugfs_congestion_kb; 112 struct dentry *debugfs_bdi; 113 struct dentry *debugfs_mdsc, *debugfs_mdsmap; 114 struct dentry *debugfs_mds_sessions; 115 #endif 116 117 #ifdef CONFIG_CEPH_FSCACHE 118 struct fscache_cookie *fscache; 119 #endif 120 }; 121 122 123 /* 124 * File i/o capability. This tracks shared state with the metadata 125 * server that allows us to cache or writeback attributes or to read 126 * and write data. For any given inode, we should have one or more 127 * capabilities, one issued by each metadata server, and our 128 * cumulative access is the OR of all issued capabilities. 129 * 130 * Each cap is referenced by the inode's i_caps rbtree and by per-mds 131 * session capability lists. 132 */ 133 struct ceph_cap { 134 struct ceph_inode_info *ci; 135 struct rb_node ci_node; /* per-ci cap tree */ 136 struct ceph_mds_session *session; 137 struct list_head session_caps; /* per-session caplist */ 138 u64 cap_id; /* unique cap id (mds provided) */ 139 union { 140 /* in-use caps */ 141 struct { 142 int issued; /* latest, from the mds */ 143 int implemented; /* implemented superset of 144 issued (for revocation) */ 145 int mds, mds_wanted; 146 }; 147 /* caps to release */ 148 struct { 149 u64 cap_ino; 150 int queue_release; 151 }; 152 }; 153 u32 seq, issue_seq, mseq; 154 u32 cap_gen; /* active/stale cycle */ 155 unsigned long last_used; 156 struct list_head caps_item; 157 }; 158 159 #define CHECK_CAPS_NODELAY 1 /* do not delay any further */ 160 #define CHECK_CAPS_AUTHONLY 2 /* only check auth cap */ 161 #define CHECK_CAPS_FLUSH 4 /* flush any dirty caps */ 162 163 struct ceph_cap_flush { 164 u64 tid; 165 int caps; /* 0 means capsnap */ 166 bool wake; /* wake up flush waiters when finish ? */ 167 struct list_head g_list; // global 168 struct list_head i_list; // per inode 169 }; 170 171 /* 172 * Snapped cap state that is pending flush to mds. When a snapshot occurs, 173 * we first complete any in-process sync writes and writeback any dirty 174 * data before flushing the snapped state (tracked here) back to the MDS. 175 */ 176 struct ceph_cap_snap { 177 refcount_t nref; 178 struct list_head ci_item; 179 180 struct ceph_cap_flush cap_flush; 181 182 u64 follows; 183 int issued, dirty; 184 struct ceph_snap_context *context; 185 186 umode_t mode; 187 kuid_t uid; 188 kgid_t gid; 189 190 struct ceph_buffer *xattr_blob; 191 u64 xattr_version; 192 193 u64 size; 194 struct timespec mtime, atime, ctime; 195 u64 time_warp_seq; 196 u64 truncate_size; 197 u32 truncate_seq; 198 int writing; /* a sync write is still in progress */ 199 int dirty_pages; /* dirty pages awaiting writeback */ 200 bool inline_data; 201 bool need_flush; 202 }; 203 204 static inline void ceph_put_cap_snap(struct ceph_cap_snap *capsnap) 205 { 206 if (refcount_dec_and_test(&capsnap->nref)) { 207 if (capsnap->xattr_blob) 208 ceph_buffer_put(capsnap->xattr_blob); 209 kfree(capsnap); 210 } 211 } 212 213 /* 214 * The frag tree describes how a directory is fragmented, potentially across 215 * multiple metadata servers. It is also used to indicate points where 216 * metadata authority is delegated, and whether/where metadata is replicated. 217 * 218 * A _leaf_ frag will be present in the i_fragtree IFF there is 219 * delegation info. That is, if mds >= 0 || ndist > 0. 220 */ 221 #define CEPH_MAX_DIRFRAG_REP 4 222 223 struct ceph_inode_frag { 224 struct rb_node node; 225 226 /* fragtree state */ 227 u32 frag; 228 int split_by; /* i.e. 2^(split_by) children */ 229 230 /* delegation and replication info */ 231 int mds; /* -1 if same authority as parent */ 232 int ndist; /* >0 if replicated */ 233 int dist[CEPH_MAX_DIRFRAG_REP]; 234 }; 235 236 /* 237 * We cache inode xattrs as an encoded blob until they are first used, 238 * at which point we parse them into an rbtree. 239 */ 240 struct ceph_inode_xattr { 241 struct rb_node node; 242 243 const char *name; 244 int name_len; 245 const char *val; 246 int val_len; 247 int dirty; 248 249 int should_free_name; 250 int should_free_val; 251 }; 252 253 /* 254 * Ceph dentry state 255 */ 256 struct ceph_dentry_info { 257 struct ceph_mds_session *lease_session; 258 u32 lease_gen, lease_shared_gen; 259 u32 lease_seq; 260 unsigned long lease_renew_after, lease_renew_from; 261 struct list_head lru; 262 struct dentry *dentry; 263 unsigned long time; 264 u64 offset; 265 }; 266 267 struct ceph_inode_xattrs_info { 268 /* 269 * (still encoded) xattr blob. we avoid the overhead of parsing 270 * this until someone actually calls getxattr, etc. 271 * 272 * blob->vec.iov_len == 4 implies there are no xattrs; blob == 273 * NULL means we don't know. 274 */ 275 struct ceph_buffer *blob, *prealloc_blob; 276 277 struct rb_root index; 278 bool dirty; 279 int count; 280 int names_size; 281 int vals_size; 282 u64 version, index_version; 283 }; 284 285 /* 286 * Ceph inode. 287 */ 288 struct ceph_inode_info { 289 struct ceph_vino i_vino; /* ceph ino + snap */ 290 291 spinlock_t i_ceph_lock; 292 293 u64 i_version; 294 u64 i_inline_version; 295 u32 i_time_warp_seq; 296 297 unsigned i_ceph_flags; 298 atomic64_t i_release_count; 299 atomic64_t i_ordered_count; 300 atomic64_t i_complete_seq[2]; 301 302 struct ceph_dir_layout i_dir_layout; 303 struct ceph_file_layout i_layout; 304 char *i_symlink; 305 306 /* for dirs */ 307 struct timespec i_rctime; 308 u64 i_rbytes, i_rfiles, i_rsubdirs; 309 u64 i_files, i_subdirs; 310 311 struct rb_root i_fragtree; 312 int i_fragtree_nsplits; 313 struct mutex i_fragtree_mutex; 314 315 struct ceph_inode_xattrs_info i_xattrs; 316 317 /* capabilities. protected _both_ by i_ceph_lock and cap->session's 318 * s_mutex. */ 319 struct rb_root i_caps; /* cap list */ 320 struct ceph_cap *i_auth_cap; /* authoritative cap, if any */ 321 unsigned i_dirty_caps, i_flushing_caps; /* mask of dirtied fields */ 322 struct list_head i_dirty_item, i_flushing_item; 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 struct ceph_cap_flush *i_prealloc_cap_flush; 327 struct list_head i_cap_flush_list; 328 wait_queue_head_t i_cap_wq; /* threads waiting on a capability */ 329 unsigned long i_hold_caps_min; /* jiffies */ 330 unsigned long i_hold_caps_max; /* jiffies */ 331 struct list_head i_cap_delay_list; /* for delayed cap release to mds */ 332 struct ceph_cap_reservation i_cap_migration_resv; 333 struct list_head i_cap_snaps; /* snapped state pending flush to mds */ 334 struct ceph_snap_context *i_head_snapc; /* set if wr_buffer_head > 0 or 335 dirty|flushing caps */ 336 unsigned i_snap_caps; /* cap bits for snapped files */ 337 338 int i_nr_by_mode[CEPH_FILE_MODE_BITS]; /* open file counts */ 339 340 struct mutex i_truncate_mutex; 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, i_wb_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; /* incremented each time we get FILE_CACHE. */ 356 u32 i_rdcache_revoking; /* RDCACHE gen to async invalidate, if any */ 357 358 struct list_head i_unsafe_dirops; /* uncommitted mds dir ops */ 359 struct list_head i_unsafe_iops; /* uncommitted mds inode ops */ 360 spinlock_t i_unsafe_lock; 361 362 struct ceph_snap_realm *i_snap_realm; /* snap realm (if caps) */ 363 int i_snap_realm_counter; /* snap realm (if caps) */ 364 struct list_head i_snap_realm_item; 365 struct list_head i_snap_flush_item; 366 367 struct work_struct i_wb_work; /* writeback work */ 368 struct work_struct i_pg_inv_work; /* page invalidation work */ 369 370 struct work_struct i_vmtruncate_work; 371 372 #ifdef CONFIG_CEPH_FSCACHE 373 struct fscache_cookie *fscache; 374 u32 i_fscache_gen; 375 #endif 376 struct inode vfs_inode; /* at end */ 377 }; 378 379 static inline struct ceph_inode_info *ceph_inode(struct inode *inode) 380 { 381 return container_of(inode, struct ceph_inode_info, vfs_inode); 382 } 383 384 static inline struct ceph_fs_client *ceph_inode_to_client(struct inode *inode) 385 { 386 return (struct ceph_fs_client *)inode->i_sb->s_fs_info; 387 } 388 389 static inline struct ceph_fs_client *ceph_sb_to_client(struct super_block *sb) 390 { 391 return (struct ceph_fs_client *)sb->s_fs_info; 392 } 393 394 static inline struct ceph_vino ceph_vino(struct inode *inode) 395 { 396 return ceph_inode(inode)->i_vino; 397 } 398 399 /* 400 * ino_t is <64 bits on many architectures, blech. 401 * 402 * i_ino (kernel inode) st_ino (userspace) 403 * i386 32 32 404 * x86_64+ino32 64 32 405 * x86_64 64 64 406 */ 407 static inline u32 ceph_ino_to_ino32(__u64 vino) 408 { 409 u32 ino = vino & 0xffffffff; 410 ino ^= vino >> 32; 411 if (!ino) 412 ino = 2; 413 return ino; 414 } 415 416 /* 417 * kernel i_ino value 418 */ 419 static inline ino_t ceph_vino_to_ino(struct ceph_vino vino) 420 { 421 #if BITS_PER_LONG == 32 422 return ceph_ino_to_ino32(vino.ino); 423 #else 424 return (ino_t)vino.ino; 425 #endif 426 } 427 428 /* 429 * user-visible ino (stat, filldir) 430 */ 431 #if BITS_PER_LONG == 32 432 static inline ino_t ceph_translate_ino(struct super_block *sb, ino_t ino) 433 { 434 return ino; 435 } 436 #else 437 static inline ino_t ceph_translate_ino(struct super_block *sb, ino_t ino) 438 { 439 if (ceph_test_mount_opt(ceph_sb_to_client(sb), INO32)) 440 ino = ceph_ino_to_ino32(ino); 441 return ino; 442 } 443 #endif 444 445 446 /* for printf-style formatting */ 447 #define ceph_vinop(i) ceph_inode(i)->i_vino.ino, ceph_inode(i)->i_vino.snap 448 449 static inline u64 ceph_ino(struct inode *inode) 450 { 451 return ceph_inode(inode)->i_vino.ino; 452 } 453 static inline u64 ceph_snap(struct inode *inode) 454 { 455 return ceph_inode(inode)->i_vino.snap; 456 } 457 458 static inline int ceph_ino_compare(struct inode *inode, void *data) 459 { 460 struct ceph_vino *pvino = (struct ceph_vino *)data; 461 struct ceph_inode_info *ci = ceph_inode(inode); 462 return ci->i_vino.ino == pvino->ino && 463 ci->i_vino.snap == pvino->snap; 464 } 465 466 static inline struct inode *ceph_find_inode(struct super_block *sb, 467 struct ceph_vino vino) 468 { 469 ino_t t = ceph_vino_to_ino(vino); 470 return ilookup5(sb, t, ceph_ino_compare, &vino); 471 } 472 473 474 /* 475 * Ceph inode. 476 */ 477 #define CEPH_I_DIR_ORDERED (1 << 0) /* dentries in dir are ordered */ 478 #define CEPH_I_NODELAY (1 << 1) /* do not delay cap release */ 479 #define CEPH_I_FLUSH (1 << 2) /* do not delay flush of dirty metadata */ 480 #define CEPH_I_NOFLUSH (1 << 3) /* do not flush dirty caps */ 481 #define CEPH_I_POOL_PERM (1 << 4) /* pool rd/wr bits are valid */ 482 #define CEPH_I_POOL_RD (1 << 5) /* can read from pool */ 483 #define CEPH_I_POOL_WR (1 << 6) /* can write to pool */ 484 #define CEPH_I_SEC_INITED (1 << 7) /* security initialized */ 485 #define CEPH_I_CAP_DROPPED (1 << 8) /* caps were forcibly dropped */ 486 #define CEPH_I_KICK_FLUSH (1 << 9) /* kick flushing caps */ 487 #define CEPH_I_FLUSH_SNAPS (1 << 10) /* need flush snapss */ 488 #define CEPH_I_ERROR_WRITE (1 << 11) /* have seen write errors */ 489 490 /* 491 * We set the ERROR_WRITE bit when we start seeing write errors on an inode 492 * and then clear it when they start succeeding. Note that we do a lockless 493 * check first, and only take the lock if it looks like it needs to be changed. 494 * The write submission code just takes this as a hint, so we're not too 495 * worried if a few slip through in either direction. 496 */ 497 static inline void ceph_set_error_write(struct ceph_inode_info *ci) 498 { 499 if (!(READ_ONCE(ci->i_ceph_flags) & CEPH_I_ERROR_WRITE)) { 500 spin_lock(&ci->i_ceph_lock); 501 ci->i_ceph_flags |= CEPH_I_ERROR_WRITE; 502 spin_unlock(&ci->i_ceph_lock); 503 } 504 } 505 506 static inline void ceph_clear_error_write(struct ceph_inode_info *ci) 507 { 508 if (READ_ONCE(ci->i_ceph_flags) & CEPH_I_ERROR_WRITE) { 509 spin_lock(&ci->i_ceph_lock); 510 ci->i_ceph_flags &= ~CEPH_I_ERROR_WRITE; 511 spin_unlock(&ci->i_ceph_lock); 512 } 513 } 514 515 static inline void __ceph_dir_set_complete(struct ceph_inode_info *ci, 516 long long release_count, 517 long long ordered_count) 518 { 519 smp_mb__before_atomic(); 520 atomic64_set(&ci->i_complete_seq[0], release_count); 521 atomic64_set(&ci->i_complete_seq[1], ordered_count); 522 } 523 524 static inline void __ceph_dir_clear_complete(struct ceph_inode_info *ci) 525 { 526 atomic64_inc(&ci->i_release_count); 527 } 528 529 static inline void __ceph_dir_clear_ordered(struct ceph_inode_info *ci) 530 { 531 atomic64_inc(&ci->i_ordered_count); 532 } 533 534 static inline bool __ceph_dir_is_complete(struct ceph_inode_info *ci) 535 { 536 return atomic64_read(&ci->i_complete_seq[0]) == 537 atomic64_read(&ci->i_release_count); 538 } 539 540 static inline bool __ceph_dir_is_complete_ordered(struct ceph_inode_info *ci) 541 { 542 return atomic64_read(&ci->i_complete_seq[0]) == 543 atomic64_read(&ci->i_release_count) && 544 atomic64_read(&ci->i_complete_seq[1]) == 545 atomic64_read(&ci->i_ordered_count); 546 } 547 548 static inline void ceph_dir_clear_complete(struct inode *inode) 549 { 550 __ceph_dir_clear_complete(ceph_inode(inode)); 551 } 552 553 static inline void ceph_dir_clear_ordered(struct inode *inode) 554 { 555 __ceph_dir_clear_ordered(ceph_inode(inode)); 556 } 557 558 static inline bool ceph_dir_is_complete_ordered(struct inode *inode) 559 { 560 bool ret = __ceph_dir_is_complete_ordered(ceph_inode(inode)); 561 smp_rmb(); 562 return ret; 563 } 564 565 /* find a specific frag @f */ 566 extern struct ceph_inode_frag *__ceph_find_frag(struct ceph_inode_info *ci, 567 u32 f); 568 569 /* 570 * choose fragment for value @v. copy frag content to pfrag, if leaf 571 * exists 572 */ 573 extern u32 ceph_choose_frag(struct ceph_inode_info *ci, u32 v, 574 struct ceph_inode_frag *pfrag, 575 int *found); 576 577 static inline struct ceph_dentry_info *ceph_dentry(struct dentry *dentry) 578 { 579 return (struct ceph_dentry_info *)dentry->d_fsdata; 580 } 581 582 /* 583 * caps helpers 584 */ 585 static inline bool __ceph_is_any_real_caps(struct ceph_inode_info *ci) 586 { 587 return !RB_EMPTY_ROOT(&ci->i_caps); 588 } 589 590 extern int __ceph_caps_issued(struct ceph_inode_info *ci, int *implemented); 591 extern int __ceph_caps_issued_mask(struct ceph_inode_info *ci, int mask, int t); 592 extern int __ceph_caps_issued_other(struct ceph_inode_info *ci, 593 struct ceph_cap *cap); 594 595 static inline int ceph_caps_issued(struct ceph_inode_info *ci) 596 { 597 int issued; 598 spin_lock(&ci->i_ceph_lock); 599 issued = __ceph_caps_issued(ci, NULL); 600 spin_unlock(&ci->i_ceph_lock); 601 return issued; 602 } 603 604 static inline int ceph_caps_issued_mask(struct ceph_inode_info *ci, int mask, 605 int touch) 606 { 607 int r; 608 spin_lock(&ci->i_ceph_lock); 609 r = __ceph_caps_issued_mask(ci, mask, touch); 610 spin_unlock(&ci->i_ceph_lock); 611 return r; 612 } 613 614 static inline int __ceph_caps_dirty(struct ceph_inode_info *ci) 615 { 616 return ci->i_dirty_caps | ci->i_flushing_caps; 617 } 618 extern struct ceph_cap_flush *ceph_alloc_cap_flush(void); 619 extern void ceph_free_cap_flush(struct ceph_cap_flush *cf); 620 extern int __ceph_mark_dirty_caps(struct ceph_inode_info *ci, int mask, 621 struct ceph_cap_flush **pcf); 622 623 extern int __ceph_caps_revoking_other(struct ceph_inode_info *ci, 624 struct ceph_cap *ocap, int mask); 625 extern int ceph_caps_revoking(struct ceph_inode_info *ci, int mask); 626 extern int __ceph_caps_used(struct ceph_inode_info *ci); 627 628 extern int __ceph_caps_file_wanted(struct ceph_inode_info *ci); 629 630 /* 631 * wanted, by virtue of open file modes AND cap refs (buffered/cached data) 632 */ 633 static inline int __ceph_caps_wanted(struct ceph_inode_info *ci) 634 { 635 int w = __ceph_caps_file_wanted(ci) | __ceph_caps_used(ci); 636 if (w & CEPH_CAP_FILE_BUFFER) 637 w |= CEPH_CAP_FILE_EXCL; /* we want EXCL if dirty data */ 638 return w; 639 } 640 641 /* what the mds thinks we want */ 642 extern int __ceph_caps_mds_wanted(struct ceph_inode_info *ci, bool check); 643 644 extern void ceph_caps_init(struct ceph_mds_client *mdsc); 645 extern void ceph_caps_finalize(struct ceph_mds_client *mdsc); 646 extern void ceph_adjust_min_caps(struct ceph_mds_client *mdsc, int delta); 647 extern void ceph_reserve_caps(struct ceph_mds_client *mdsc, 648 struct ceph_cap_reservation *ctx, int need); 649 extern int ceph_unreserve_caps(struct ceph_mds_client *mdsc, 650 struct ceph_cap_reservation *ctx); 651 extern void ceph_reservation_status(struct ceph_fs_client *client, 652 int *total, int *avail, int *used, 653 int *reserved, int *min); 654 655 656 657 /* 658 * we keep buffered readdir results attached to file->private_data 659 */ 660 #define CEPH_F_SYNC 1 661 #define CEPH_F_ATEND 2 662 663 struct ceph_file_info { 664 short fmode; /* initialized on open */ 665 short flags; /* CEPH_F_* */ 666 667 /* readdir: position within the dir */ 668 u32 frag; 669 struct ceph_mds_request *last_readdir; 670 671 /* readdir: position within a frag */ 672 unsigned next_offset; /* offset of next chunk (last_name's + 1) */ 673 char *last_name; /* last entry in previous chunk */ 674 long long dir_release_count; 675 long long dir_ordered_count; 676 int readdir_cache_idx; 677 678 /* used for -o dirstat read() on directory thing */ 679 char *dir_info; 680 int dir_info_len; 681 }; 682 683 struct ceph_readdir_cache_control { 684 struct page *page; 685 struct dentry **dentries; 686 int index; 687 }; 688 689 /* 690 * A "snap realm" describes a subset of the file hierarchy sharing 691 * the same set of snapshots that apply to it. The realms themselves 692 * are organized into a hierarchy, such that children inherit (some of) 693 * the snapshots of their parents. 694 * 695 * All inodes within the realm that have capabilities are linked into a 696 * per-realm list. 697 */ 698 struct ceph_snap_realm { 699 u64 ino; 700 atomic_t nref; 701 struct rb_node node; 702 703 u64 created, seq; 704 u64 parent_ino; 705 u64 parent_since; /* snapid when our current parent became so */ 706 707 u64 *prior_parent_snaps; /* snaps inherited from any parents we */ 708 u32 num_prior_parent_snaps; /* had prior to parent_since */ 709 u64 *snaps; /* snaps specific to this realm */ 710 u32 num_snaps; 711 712 struct ceph_snap_realm *parent; 713 struct list_head children; /* list of child realms */ 714 struct list_head child_item; 715 716 struct list_head empty_item; /* if i have ref==0 */ 717 718 struct list_head dirty_item; /* if realm needs new context */ 719 720 /* the current set of snaps for this realm */ 721 struct ceph_snap_context *cached_context; 722 723 struct list_head inodes_with_caps; 724 spinlock_t inodes_with_caps_lock; 725 }; 726 727 static inline int default_congestion_kb(void) 728 { 729 int congestion_kb; 730 731 /* 732 * Copied from NFS 733 * 734 * congestion size, scale with available memory. 735 * 736 * 64MB: 8192k 737 * 128MB: 11585k 738 * 256MB: 16384k 739 * 512MB: 23170k 740 * 1GB: 32768k 741 * 2GB: 46340k 742 * 4GB: 65536k 743 * 8GB: 92681k 744 * 16GB: 131072k 745 * 746 * This allows larger machines to have larger/more transfers. 747 * Limit the default to 256M 748 */ 749 congestion_kb = (16*int_sqrt(totalram_pages)) << (PAGE_SHIFT-10); 750 if (congestion_kb > 256*1024) 751 congestion_kb = 256*1024; 752 753 return congestion_kb; 754 } 755 756 757 758 /* snap.c */ 759 struct ceph_snap_realm *ceph_lookup_snap_realm(struct ceph_mds_client *mdsc, 760 u64 ino); 761 extern void ceph_get_snap_realm(struct ceph_mds_client *mdsc, 762 struct ceph_snap_realm *realm); 763 extern void ceph_put_snap_realm(struct ceph_mds_client *mdsc, 764 struct ceph_snap_realm *realm); 765 extern int ceph_update_snap_trace(struct ceph_mds_client *m, 766 void *p, void *e, bool deletion, 767 struct ceph_snap_realm **realm_ret); 768 extern void ceph_handle_snap(struct ceph_mds_client *mdsc, 769 struct ceph_mds_session *session, 770 struct ceph_msg *msg); 771 extern void ceph_queue_cap_snap(struct ceph_inode_info *ci); 772 extern int __ceph_finish_cap_snap(struct ceph_inode_info *ci, 773 struct ceph_cap_snap *capsnap); 774 extern void ceph_cleanup_empty_realms(struct ceph_mds_client *mdsc); 775 776 /* 777 * a cap_snap is "pending" if it is still awaiting an in-progress 778 * sync write (that may/may not still update size, mtime, etc.). 779 */ 780 static inline bool __ceph_have_pending_cap_snap(struct ceph_inode_info *ci) 781 { 782 return !list_empty(&ci->i_cap_snaps) && 783 list_last_entry(&ci->i_cap_snaps, struct ceph_cap_snap, 784 ci_item)->writing; 785 } 786 787 /* inode.c */ 788 extern const struct inode_operations ceph_file_iops; 789 790 extern struct inode *ceph_alloc_inode(struct super_block *sb); 791 extern void ceph_destroy_inode(struct inode *inode); 792 extern int ceph_drop_inode(struct inode *inode); 793 794 extern struct inode *ceph_get_inode(struct super_block *sb, 795 struct ceph_vino vino); 796 extern struct inode *ceph_get_snapdir(struct inode *parent); 797 extern int ceph_fill_file_size(struct inode *inode, int issued, 798 u32 truncate_seq, u64 truncate_size, u64 size); 799 extern void ceph_fill_file_time(struct inode *inode, int issued, 800 u64 time_warp_seq, struct timespec *ctime, 801 struct timespec *mtime, struct timespec *atime); 802 extern int ceph_fill_trace(struct super_block *sb, 803 struct ceph_mds_request *req); 804 extern int ceph_readdir_prepopulate(struct ceph_mds_request *req, 805 struct ceph_mds_session *session); 806 807 extern int ceph_inode_holds_cap(struct inode *inode, int mask); 808 809 extern bool ceph_inode_set_size(struct inode *inode, loff_t size); 810 extern void __ceph_do_pending_vmtruncate(struct inode *inode); 811 extern void ceph_queue_vmtruncate(struct inode *inode); 812 813 extern void ceph_queue_invalidate(struct inode *inode); 814 extern void ceph_queue_writeback(struct inode *inode); 815 816 extern int __ceph_do_getattr(struct inode *inode, struct page *locked_page, 817 int mask, bool force); 818 static inline int ceph_do_getattr(struct inode *inode, int mask, bool force) 819 { 820 return __ceph_do_getattr(inode, NULL, mask, force); 821 } 822 extern int ceph_permission(struct inode *inode, int mask); 823 extern int __ceph_setattr(struct inode *inode, struct iattr *attr); 824 extern int ceph_setattr(struct dentry *dentry, struct iattr *attr); 825 extern int ceph_getattr(const struct path *path, struct kstat *stat, 826 u32 request_mask, unsigned int flags); 827 828 /* xattr.c */ 829 int __ceph_setxattr(struct inode *, const char *, const void *, size_t, int); 830 ssize_t __ceph_getxattr(struct inode *, const char *, void *, size_t); 831 extern ssize_t ceph_listxattr(struct dentry *, char *, size_t); 832 extern void __ceph_build_xattrs_blob(struct ceph_inode_info *ci); 833 extern void __ceph_destroy_xattrs(struct ceph_inode_info *ci); 834 extern void __init ceph_xattr_init(void); 835 extern void ceph_xattr_exit(void); 836 extern const struct xattr_handler *ceph_xattr_handlers[]; 837 838 #ifdef CONFIG_SECURITY 839 extern bool ceph_security_xattr_deadlock(struct inode *in); 840 extern bool ceph_security_xattr_wanted(struct inode *in); 841 #else 842 static inline bool ceph_security_xattr_deadlock(struct inode *in) 843 { 844 return false; 845 } 846 static inline bool ceph_security_xattr_wanted(struct inode *in) 847 { 848 return false; 849 } 850 #endif 851 852 /* acl.c */ 853 struct ceph_acls_info { 854 void *default_acl; 855 void *acl; 856 struct ceph_pagelist *pagelist; 857 }; 858 859 #ifdef CONFIG_CEPH_FS_POSIX_ACL 860 861 struct posix_acl *ceph_get_acl(struct inode *, int); 862 int ceph_set_acl(struct inode *inode, struct posix_acl *acl, int type); 863 int ceph_pre_init_acls(struct inode *dir, umode_t *mode, 864 struct ceph_acls_info *info); 865 void ceph_init_inode_acls(struct inode *inode, struct ceph_acls_info *info); 866 void ceph_release_acls_info(struct ceph_acls_info *info); 867 868 static inline void ceph_forget_all_cached_acls(struct inode *inode) 869 { 870 forget_all_cached_acls(inode); 871 } 872 873 #else 874 875 #define ceph_get_acl NULL 876 #define ceph_set_acl NULL 877 878 static inline int ceph_pre_init_acls(struct inode *dir, umode_t *mode, 879 struct ceph_acls_info *info) 880 { 881 return 0; 882 } 883 static inline void ceph_init_inode_acls(struct inode *inode, 884 struct ceph_acls_info *info) 885 { 886 } 887 static inline void ceph_release_acls_info(struct ceph_acls_info *info) 888 { 889 } 890 static inline int ceph_acl_chmod(struct dentry *dentry, struct inode *inode) 891 { 892 return 0; 893 } 894 895 static inline void ceph_forget_all_cached_acls(struct inode *inode) 896 { 897 } 898 899 #endif 900 901 /* caps.c */ 902 extern const char *ceph_cap_string(int c); 903 extern void ceph_handle_caps(struct ceph_mds_session *session, 904 struct ceph_msg *msg); 905 extern struct ceph_cap *ceph_get_cap(struct ceph_mds_client *mdsc, 906 struct ceph_cap_reservation *ctx); 907 extern void ceph_add_cap(struct inode *inode, 908 struct ceph_mds_session *session, u64 cap_id, 909 int fmode, unsigned issued, unsigned wanted, 910 unsigned cap, unsigned seq, u64 realmino, int flags, 911 struct ceph_cap **new_cap); 912 extern void __ceph_remove_cap(struct ceph_cap *cap, bool queue_release); 913 extern void ceph_put_cap(struct ceph_mds_client *mdsc, 914 struct ceph_cap *cap); 915 extern int ceph_is_any_caps(struct inode *inode); 916 917 extern void ceph_queue_caps_release(struct inode *inode); 918 extern int ceph_write_inode(struct inode *inode, struct writeback_control *wbc); 919 extern int ceph_fsync(struct file *file, loff_t start, loff_t end, 920 int datasync); 921 extern void ceph_early_kick_flushing_caps(struct ceph_mds_client *mdsc, 922 struct ceph_mds_session *session); 923 extern void ceph_kick_flushing_caps(struct ceph_mds_client *mdsc, 924 struct ceph_mds_session *session); 925 extern struct ceph_cap *ceph_get_cap_for_mds(struct ceph_inode_info *ci, 926 int mds); 927 extern int ceph_get_cap_mds(struct inode *inode); 928 extern void ceph_get_cap_refs(struct ceph_inode_info *ci, int caps); 929 extern void ceph_put_cap_refs(struct ceph_inode_info *ci, int had); 930 extern void ceph_put_wrbuffer_cap_refs(struct ceph_inode_info *ci, int nr, 931 struct ceph_snap_context *snapc); 932 extern void ceph_flush_snaps(struct ceph_inode_info *ci, 933 struct ceph_mds_session **psession); 934 extern bool __ceph_should_report_size(struct ceph_inode_info *ci); 935 extern void ceph_check_caps(struct ceph_inode_info *ci, int flags, 936 struct ceph_mds_session *session); 937 extern void ceph_check_delayed_caps(struct ceph_mds_client *mdsc); 938 extern void ceph_flush_dirty_caps(struct ceph_mds_client *mdsc); 939 940 extern int ceph_encode_inode_release(void **p, struct inode *inode, 941 int mds, int drop, int unless, int force); 942 extern int ceph_encode_dentry_release(void **p, struct dentry *dn, 943 struct inode *dir, 944 int mds, int drop, int unless); 945 946 extern int ceph_get_caps(struct ceph_inode_info *ci, int need, int want, 947 loff_t endoff, int *got, struct page **pinned_page); 948 extern int ceph_try_get_caps(struct ceph_inode_info *ci, 949 int need, int want, int *got); 950 951 /* for counting open files by mode */ 952 extern void __ceph_get_fmode(struct ceph_inode_info *ci, int mode); 953 extern void ceph_put_fmode(struct ceph_inode_info *ci, int mode); 954 955 /* addr.c */ 956 extern const struct address_space_operations ceph_aops; 957 extern int ceph_mmap(struct file *file, struct vm_area_struct *vma); 958 extern int ceph_uninline_data(struct file *filp, struct page *locked_page); 959 extern int ceph_pool_perm_check(struct ceph_inode_info *ci, int need); 960 extern void ceph_pool_perm_destroy(struct ceph_mds_client* mdsc); 961 962 /* file.c */ 963 extern const struct file_operations ceph_file_fops; 964 965 extern int ceph_renew_caps(struct inode *inode); 966 extern int ceph_open(struct inode *inode, struct file *file); 967 extern int ceph_atomic_open(struct inode *dir, struct dentry *dentry, 968 struct file *file, unsigned flags, umode_t mode, 969 int *opened); 970 extern int ceph_release(struct inode *inode, struct file *filp); 971 extern void ceph_fill_inline_data(struct inode *inode, struct page *locked_page, 972 char *data, size_t len); 973 974 /* dir.c */ 975 extern const struct file_operations ceph_dir_fops; 976 extern const struct file_operations ceph_snapdir_fops; 977 extern const struct inode_operations ceph_dir_iops; 978 extern const struct inode_operations ceph_snapdir_iops; 979 extern const struct dentry_operations ceph_dentry_ops; 980 981 extern loff_t ceph_make_fpos(unsigned high, unsigned off, bool hash_order); 982 extern int ceph_handle_notrace_create(struct inode *dir, struct dentry *dentry); 983 extern int ceph_handle_snapdir(struct ceph_mds_request *req, 984 struct dentry *dentry, int err); 985 extern struct dentry *ceph_finish_lookup(struct ceph_mds_request *req, 986 struct dentry *dentry, int err); 987 988 extern void ceph_dentry_lru_add(struct dentry *dn); 989 extern void ceph_dentry_lru_touch(struct dentry *dn); 990 extern void ceph_dentry_lru_del(struct dentry *dn); 991 extern void ceph_invalidate_dentry_lease(struct dentry *dentry); 992 extern unsigned ceph_dentry_hash(struct inode *dir, struct dentry *dn); 993 extern void ceph_readdir_cache_release(struct ceph_readdir_cache_control *ctl); 994 995 /* ioctl.c */ 996 extern long ceph_ioctl(struct file *file, unsigned int cmd, unsigned long arg); 997 998 /* export.c */ 999 extern const struct export_operations ceph_export_ops; 1000 1001 /* locks.c */ 1002 extern __init void ceph_flock_init(void); 1003 extern int ceph_lock(struct file *file, int cmd, struct file_lock *fl); 1004 extern int ceph_flock(struct file *file, int cmd, struct file_lock *fl); 1005 extern void ceph_count_locks(struct inode *inode, int *p_num, int *f_num); 1006 extern int ceph_encode_locks_to_buffer(struct inode *inode, 1007 struct ceph_filelock *flocks, 1008 int num_fcntl_locks, 1009 int num_flock_locks); 1010 extern int ceph_locks_to_pagelist(struct ceph_filelock *flocks, 1011 struct ceph_pagelist *pagelist, 1012 int num_fcntl_locks, int num_flock_locks); 1013 extern int lock_to_ceph_filelock(struct file_lock *fl, struct ceph_filelock *c); 1014 1015 /* debugfs.c */ 1016 extern int ceph_fs_debugfs_init(struct ceph_fs_client *client); 1017 extern void ceph_fs_debugfs_cleanup(struct ceph_fs_client *client); 1018 1019 #endif /* _FS_CEPH_SUPER_H */ 1020