1 /* SPDX-License-Identifier: GPL-2.0 */ 2 #ifndef _FS_CEPH_SUPER_H 3 #define _FS_CEPH_SUPER_H 4 5 #include <linux/ceph/ceph_debug.h> 6 7 #include <asm/unaligned.h> 8 #include <linux/backing-dev.h> 9 #include <linux/completion.h> 10 #include <linux/exportfs.h> 11 #include <linux/fs.h> 12 #include <linux/mempool.h> 13 #include <linux/pagemap.h> 14 #include <linux/wait.h> 15 #include <linux/writeback.h> 16 #include <linux/slab.h> 17 #include <linux/posix_acl.h> 18 #include <linux/refcount.h> 19 20 #include <linux/ceph/libceph.h> 21 22 #ifdef CONFIG_CEPH_FSCACHE 23 #include <linux/fscache.h> 24 #endif 25 26 /* f_type in struct statfs */ 27 #define CEPH_SUPER_MAGIC 0x00c36400 28 29 /* large granularity for statfs utilization stats to facilitate 30 * large volume sizes on 32-bit machines. */ 31 #define CEPH_BLOCK_SHIFT 22 /* 4 MB */ 32 #define CEPH_BLOCK (1 << CEPH_BLOCK_SHIFT) 33 34 #define CEPH_MOUNT_OPT_DIRSTAT (1<<4) /* `cat dirname` for stats */ 35 #define CEPH_MOUNT_OPT_RBYTES (1<<5) /* dir st_bytes = rbytes */ 36 #define CEPH_MOUNT_OPT_NOASYNCREADDIR (1<<7) /* no dcache readdir */ 37 #define CEPH_MOUNT_OPT_INO32 (1<<8) /* 32 bit inos */ 38 #define CEPH_MOUNT_OPT_DCACHE (1<<9) /* use dcache for readdir etc */ 39 #define CEPH_MOUNT_OPT_FSCACHE (1<<10) /* use fscache */ 40 #define CEPH_MOUNT_OPT_NOPOOLPERM (1<<11) /* no pool permission check */ 41 #define CEPH_MOUNT_OPT_MOUNTWAIT (1<<12) /* mount waits if no mds is up */ 42 43 #define CEPH_MOUNT_OPT_DEFAULT CEPH_MOUNT_OPT_DCACHE 44 45 #define ceph_set_mount_opt(fsc, opt) \ 46 (fsc)->mount_options->flags |= CEPH_MOUNT_OPT_##opt; 47 #define ceph_test_mount_opt(fsc, opt) \ 48 (!!((fsc)->mount_options->flags & CEPH_MOUNT_OPT_##opt)) 49 50 /* max size of osd read request, limited by libceph */ 51 #define CEPH_MAX_READ_SIZE CEPH_MSG_MAX_DATA_LEN 52 /* osd has a configurable limitaion of max write size. 53 * CEPH_MSG_MAX_DATA_LEN should be small enough. */ 54 #define CEPH_MAX_WRITE_SIZE CEPH_MSG_MAX_DATA_LEN 55 #define CEPH_RASIZE_DEFAULT (8192*1024) /* max readahead */ 56 #define CEPH_MAX_READDIR_DEFAULT 1024 57 #define CEPH_MAX_READDIR_BYTES_DEFAULT (512*1024) 58 #define CEPH_SNAPDIRNAME_DEFAULT ".snap" 59 60 /* 61 * Delay telling the MDS we no longer want caps, in case we reopen 62 * the file. Delay a minimum amount of time, even if we send a cap 63 * message for some other reason. Otherwise, take the oppotunity to 64 * update the mds to avoid sending another message later. 65 */ 66 #define CEPH_CAPS_WANTED_DELAY_MIN_DEFAULT 5 /* cap release delay */ 67 #define CEPH_CAPS_WANTED_DELAY_MAX_DEFAULT 60 /* cap release delay */ 68 69 struct ceph_mount_options { 70 int flags; 71 int sb_flags; 72 73 int wsize; /* max write size */ 74 int rsize; /* max read size */ 75 int rasize; /* max readahead */ 76 int congestion_kb; /* max writeback in flight */ 77 int caps_wanted_delay_min, caps_wanted_delay_max; 78 int max_readdir; /* max readdir result (entires) */ 79 int max_readdir_bytes; /* max readdir result (bytes) */ 80 81 /* 82 * everything above this point can be memcmp'd; everything below 83 * is handled in compare_mount_options() 84 */ 85 86 char *snapdir_name; /* default ".snap" */ 87 char *mds_namespace; /* default NULL */ 88 char *server_path; /* default "/" */ 89 char *fscache_uniq; /* default NULL */ 90 }; 91 92 struct ceph_fs_client { 93 struct super_block *sb; 94 95 struct ceph_mount_options *mount_options; 96 struct ceph_client *client; 97 98 unsigned long mount_state; 99 int min_caps; /* min caps i added */ 100 101 struct ceph_mds_client *mdsc; 102 103 /* writeback */ 104 mempool_t *wb_pagevec_pool; 105 struct workqueue_struct *wb_wq; 106 struct workqueue_struct *pg_inv_wq; 107 struct workqueue_struct *trunc_wq; 108 atomic_long_t writeback_count; 109 110 #ifdef CONFIG_DEBUG_FS 111 struct dentry *debugfs_dentry_lru, *debugfs_caps; 112 struct dentry *debugfs_congestion_kb; 113 struct dentry *debugfs_bdi; 114 struct dentry *debugfs_mdsc, *debugfs_mdsmap; 115 struct dentry *debugfs_mds_sessions; 116 #endif 117 118 #ifdef CONFIG_CEPH_FSCACHE 119 struct fscache_cookie *fscache; 120 #endif 121 }; 122 123 124 /* 125 * File i/o capability. This tracks shared state with the metadata 126 * server that allows us to cache or writeback attributes or to read 127 * and write data. For any given inode, we should have one or more 128 * capabilities, one issued by each metadata server, and our 129 * cumulative access is the OR of all issued capabilities. 130 * 131 * Each cap is referenced by the inode's i_caps rbtree and by per-mds 132 * session capability lists. 133 */ 134 struct ceph_cap { 135 struct ceph_inode_info *ci; 136 struct rb_node ci_node; /* per-ci cap tree */ 137 struct ceph_mds_session *session; 138 struct list_head session_caps; /* per-session caplist */ 139 u64 cap_id; /* unique cap id (mds provided) */ 140 union { 141 /* in-use caps */ 142 struct { 143 int issued; /* latest, from the mds */ 144 int implemented; /* implemented superset of 145 issued (for revocation) */ 146 int mds, mds_wanted; 147 }; 148 /* caps to release */ 149 struct { 150 u64 cap_ino; 151 int queue_release; 152 }; 153 }; 154 u32 seq, issue_seq, mseq; 155 u32 cap_gen; /* active/stale cycle */ 156 unsigned long last_used; 157 struct list_head caps_item; 158 }; 159 160 #define CHECK_CAPS_NODELAY 1 /* do not delay any further */ 161 #define CHECK_CAPS_AUTHONLY 2 /* only check auth cap */ 162 #define CHECK_CAPS_FLUSH 4 /* flush any dirty caps */ 163 164 struct ceph_cap_flush { 165 u64 tid; 166 int caps; /* 0 means capsnap */ 167 bool wake; /* wake up flush waiters when finish ? */ 168 struct list_head g_list; // global 169 struct list_head i_list; // per inode 170 }; 171 172 /* 173 * Snapped cap state that is pending flush to mds. When a snapshot occurs, 174 * we first complete any in-process sync writes and writeback any dirty 175 * data before flushing the snapped state (tracked here) back to the MDS. 176 */ 177 struct ceph_cap_snap { 178 refcount_t nref; 179 struct list_head ci_item; 180 181 struct ceph_cap_flush cap_flush; 182 183 u64 follows; 184 int issued, dirty; 185 struct ceph_snap_context *context; 186 187 umode_t mode; 188 kuid_t uid; 189 kgid_t gid; 190 191 struct ceph_buffer *xattr_blob; 192 u64 xattr_version; 193 194 u64 size; 195 struct timespec mtime, atime, ctime; 196 u64 time_warp_seq; 197 u64 truncate_size; 198 u32 truncate_seq; 199 int writing; /* a sync write is still in progress */ 200 int dirty_pages; /* dirty pages awaiting writeback */ 201 bool inline_data; 202 bool need_flush; 203 }; 204 205 static inline void ceph_put_cap_snap(struct ceph_cap_snap *capsnap) 206 { 207 if (refcount_dec_and_test(&capsnap->nref)) { 208 if (capsnap->xattr_blob) 209 ceph_buffer_put(capsnap->xattr_blob); 210 kfree(capsnap); 211 } 212 } 213 214 /* 215 * The frag tree describes how a directory is fragmented, potentially across 216 * multiple metadata servers. It is also used to indicate points where 217 * metadata authority is delegated, and whether/where metadata is replicated. 218 * 219 * A _leaf_ frag will be present in the i_fragtree IFF there is 220 * delegation info. That is, if mds >= 0 || ndist > 0. 221 */ 222 #define CEPH_MAX_DIRFRAG_REP 4 223 224 struct ceph_inode_frag { 225 struct rb_node node; 226 227 /* fragtree state */ 228 u32 frag; 229 int split_by; /* i.e. 2^(split_by) children */ 230 231 /* delegation and replication info */ 232 int mds; /* -1 if same authority as parent */ 233 int ndist; /* >0 if replicated */ 234 int dist[CEPH_MAX_DIRFRAG_REP]; 235 }; 236 237 /* 238 * We cache inode xattrs as an encoded blob until they are first used, 239 * at which point we parse them into an rbtree. 240 */ 241 struct ceph_inode_xattr { 242 struct rb_node node; 243 244 const char *name; 245 int name_len; 246 const char *val; 247 int val_len; 248 int dirty; 249 250 int should_free_name; 251 int should_free_val; 252 }; 253 254 /* 255 * Ceph dentry state 256 */ 257 struct ceph_dentry_info { 258 struct ceph_mds_session *lease_session; 259 u32 lease_gen, lease_shared_gen; 260 u32 lease_seq; 261 unsigned long lease_renew_after, lease_renew_from; 262 struct list_head lru; 263 struct dentry *dentry; 264 unsigned long time; 265 u64 offset; 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 struct ceph_inode_info { 290 struct ceph_vino i_vino; /* ceph ino + snap */ 291 292 spinlock_t i_ceph_lock; 293 294 u64 i_version; 295 u64 i_inline_version; 296 u32 i_time_warp_seq; 297 298 unsigned i_ceph_flags; 299 atomic64_t i_release_count; 300 atomic64_t i_ordered_count; 301 atomic64_t i_complete_seq[2]; 302 303 struct ceph_dir_layout i_dir_layout; 304 struct ceph_file_layout i_layout; 305 char *i_symlink; 306 307 /* for dirs */ 308 struct timespec i_rctime; 309 u64 i_rbytes, i_rfiles, i_rsubdirs; 310 u64 i_files, i_subdirs; 311 312 struct rb_root i_fragtree; 313 int i_fragtree_nsplits; 314 struct mutex i_fragtree_mutex; 315 316 struct ceph_inode_xattrs_info i_xattrs; 317 318 /* capabilities. protected _both_ by i_ceph_lock and cap->session's 319 * s_mutex. */ 320 struct rb_root i_caps; /* cap list */ 321 struct ceph_cap *i_auth_cap; /* authoritative cap, if any */ 322 unsigned i_dirty_caps, i_flushing_caps; /* mask of dirtied fields */ 323 struct list_head i_dirty_item, i_flushing_item; 324 /* we need to track cap writeback on a per-cap-bit basis, to allow 325 * overlapping, pipelined cap flushes to the mds. we can probably 326 * reduce the tid to 8 bits if we're concerned about inode size. */ 327 struct ceph_cap_flush *i_prealloc_cap_flush; 328 struct list_head i_cap_flush_list; 329 wait_queue_head_t i_cap_wq; /* threads waiting on a capability */ 330 unsigned long i_hold_caps_min; /* jiffies */ 331 unsigned long i_hold_caps_max; /* jiffies */ 332 struct list_head i_cap_delay_list; /* for delayed cap release to mds */ 333 struct ceph_cap_reservation i_cap_migration_resv; 334 struct list_head i_cap_snaps; /* snapped state pending flush to mds */ 335 struct ceph_snap_context *i_head_snapc; /* set if wr_buffer_head > 0 or 336 dirty|flushing caps */ 337 unsigned i_snap_caps; /* cap bits for snapped files */ 338 339 int i_nr_by_mode[CEPH_FILE_MODE_BITS]; /* open file counts */ 340 341 struct mutex i_truncate_mutex; 342 u32 i_truncate_seq; /* last truncate to smaller size */ 343 u64 i_truncate_size; /* and the size we last truncated down to */ 344 int i_truncate_pending; /* still need to call vmtruncate */ 345 346 u64 i_max_size; /* max file size authorized by mds */ 347 u64 i_reported_size; /* (max_)size reported to or requested of mds */ 348 u64 i_wanted_max_size; /* offset we'd like to write too */ 349 u64 i_requested_max_size; /* max_size we've requested */ 350 351 /* held references to caps */ 352 int i_pin_ref; 353 int i_rd_ref, i_rdcache_ref, i_wr_ref, i_wb_ref; 354 int i_wrbuffer_ref, i_wrbuffer_ref_head; 355 atomic_t i_filelock_ref; 356 u32 i_shared_gen; /* increment each time we get FILE_SHARED */ 357 u32 i_rdcache_gen; /* incremented each time we get FILE_CACHE. */ 358 u32 i_rdcache_revoking; /* RDCACHE gen to async invalidate, if any */ 359 360 struct list_head i_unsafe_dirops; /* uncommitted mds dir ops */ 361 struct list_head i_unsafe_iops; /* uncommitted mds inode 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 #ifdef CONFIG_CEPH_FSCACHE 375 struct fscache_cookie *fscache; 376 u32 i_fscache_gen; 377 #endif 378 struct inode vfs_inode; /* at end */ 379 }; 380 381 static inline struct ceph_inode_info *ceph_inode(struct inode *inode) 382 { 383 return container_of(inode, struct ceph_inode_info, vfs_inode); 384 } 385 386 static inline struct ceph_fs_client *ceph_inode_to_client(struct inode *inode) 387 { 388 return (struct ceph_fs_client *)inode->i_sb->s_fs_info; 389 } 390 391 static inline struct ceph_fs_client *ceph_sb_to_client(struct super_block *sb) 392 { 393 return (struct ceph_fs_client *)sb->s_fs_info; 394 } 395 396 static inline struct ceph_vino ceph_vino(struct inode *inode) 397 { 398 return ceph_inode(inode)->i_vino; 399 } 400 401 /* 402 * ino_t is <64 bits on many architectures, blech. 403 * 404 * i_ino (kernel inode) st_ino (userspace) 405 * i386 32 32 406 * x86_64+ino32 64 32 407 * x86_64 64 64 408 */ 409 static inline u32 ceph_ino_to_ino32(__u64 vino) 410 { 411 u32 ino = vino & 0xffffffff; 412 ino ^= vino >> 32; 413 if (!ino) 414 ino = 2; 415 return ino; 416 } 417 418 /* 419 * kernel i_ino value 420 */ 421 static inline ino_t ceph_vino_to_ino(struct ceph_vino vino) 422 { 423 #if BITS_PER_LONG == 32 424 return ceph_ino_to_ino32(vino.ino); 425 #else 426 return (ino_t)vino.ino; 427 #endif 428 } 429 430 /* 431 * user-visible ino (stat, filldir) 432 */ 433 #if BITS_PER_LONG == 32 434 static inline ino_t ceph_translate_ino(struct super_block *sb, ino_t ino) 435 { 436 return ino; 437 } 438 #else 439 static inline ino_t ceph_translate_ino(struct super_block *sb, ino_t ino) 440 { 441 if (ceph_test_mount_opt(ceph_sb_to_client(sb), INO32)) 442 ino = ceph_ino_to_ino32(ino); 443 return ino; 444 } 445 #endif 446 447 448 /* for printf-style formatting */ 449 #define ceph_vinop(i) ceph_inode(i)->i_vino.ino, ceph_inode(i)->i_vino.snap 450 451 static inline u64 ceph_ino(struct inode *inode) 452 { 453 return ceph_inode(inode)->i_vino.ino; 454 } 455 static inline u64 ceph_snap(struct inode *inode) 456 { 457 return ceph_inode(inode)->i_vino.snap; 458 } 459 460 static inline int ceph_ino_compare(struct inode *inode, void *data) 461 { 462 struct ceph_vino *pvino = (struct ceph_vino *)data; 463 struct ceph_inode_info *ci = ceph_inode(inode); 464 return ci->i_vino.ino == pvino->ino && 465 ci->i_vino.snap == pvino->snap; 466 } 467 468 static inline struct inode *ceph_find_inode(struct super_block *sb, 469 struct ceph_vino vino) 470 { 471 ino_t t = ceph_vino_to_ino(vino); 472 return ilookup5(sb, t, ceph_ino_compare, &vino); 473 } 474 475 476 /* 477 * Ceph inode. 478 */ 479 #define CEPH_I_DIR_ORDERED (1 << 0) /* dentries in dir are ordered */ 480 #define CEPH_I_NODELAY (1 << 1) /* do not delay cap release */ 481 #define CEPH_I_FLUSH (1 << 2) /* do not delay flush of dirty metadata */ 482 #define CEPH_I_NOFLUSH (1 << 3) /* do not flush dirty caps */ 483 #define CEPH_I_POOL_PERM (1 << 4) /* pool rd/wr bits are valid */ 484 #define CEPH_I_POOL_RD (1 << 5) /* can read from pool */ 485 #define CEPH_I_POOL_WR (1 << 6) /* can write to pool */ 486 #define CEPH_I_SEC_INITED (1 << 7) /* security initialized */ 487 #define CEPH_I_CAP_DROPPED (1 << 8) /* caps were forcibly dropped */ 488 #define CEPH_I_KICK_FLUSH (1 << 9) /* kick flushing caps */ 489 #define CEPH_I_FLUSH_SNAPS (1 << 10) /* need flush snapss */ 490 #define CEPH_I_ERROR_WRITE (1 << 11) /* have seen write errors */ 491 #define CEPH_I_ERROR_FILELOCK (1 << 12) /* have seen file lock errors */ 492 493 494 /* 495 * We set the ERROR_WRITE bit when we start seeing write errors on an inode 496 * and then clear it when they start succeeding. Note that we do a lockless 497 * check first, and only take the lock if it looks like it needs to be changed. 498 * The write submission code just takes this as a hint, so we're not too 499 * worried if a few slip through in either direction. 500 */ 501 static inline void ceph_set_error_write(struct ceph_inode_info *ci) 502 { 503 if (!(READ_ONCE(ci->i_ceph_flags) & CEPH_I_ERROR_WRITE)) { 504 spin_lock(&ci->i_ceph_lock); 505 ci->i_ceph_flags |= CEPH_I_ERROR_WRITE; 506 spin_unlock(&ci->i_ceph_lock); 507 } 508 } 509 510 static inline void ceph_clear_error_write(struct ceph_inode_info *ci) 511 { 512 if (READ_ONCE(ci->i_ceph_flags) & CEPH_I_ERROR_WRITE) { 513 spin_lock(&ci->i_ceph_lock); 514 ci->i_ceph_flags &= ~CEPH_I_ERROR_WRITE; 515 spin_unlock(&ci->i_ceph_lock); 516 } 517 } 518 519 static inline void __ceph_dir_set_complete(struct ceph_inode_info *ci, 520 long long release_count, 521 long long ordered_count) 522 { 523 smp_mb__before_atomic(); 524 atomic64_set(&ci->i_complete_seq[0], release_count); 525 atomic64_set(&ci->i_complete_seq[1], ordered_count); 526 } 527 528 static inline void __ceph_dir_clear_complete(struct ceph_inode_info *ci) 529 { 530 atomic64_inc(&ci->i_release_count); 531 } 532 533 static inline void __ceph_dir_clear_ordered(struct ceph_inode_info *ci) 534 { 535 atomic64_inc(&ci->i_ordered_count); 536 } 537 538 static inline bool __ceph_dir_is_complete(struct ceph_inode_info *ci) 539 { 540 return atomic64_read(&ci->i_complete_seq[0]) == 541 atomic64_read(&ci->i_release_count); 542 } 543 544 static inline bool __ceph_dir_is_complete_ordered(struct ceph_inode_info *ci) 545 { 546 return atomic64_read(&ci->i_complete_seq[0]) == 547 atomic64_read(&ci->i_release_count) && 548 atomic64_read(&ci->i_complete_seq[1]) == 549 atomic64_read(&ci->i_ordered_count); 550 } 551 552 static inline void ceph_dir_clear_complete(struct inode *inode) 553 { 554 __ceph_dir_clear_complete(ceph_inode(inode)); 555 } 556 557 static inline void ceph_dir_clear_ordered(struct inode *inode) 558 { 559 __ceph_dir_clear_ordered(ceph_inode(inode)); 560 } 561 562 static inline bool ceph_dir_is_complete_ordered(struct inode *inode) 563 { 564 bool ret = __ceph_dir_is_complete_ordered(ceph_inode(inode)); 565 smp_rmb(); 566 return ret; 567 } 568 569 /* find a specific frag @f */ 570 extern struct ceph_inode_frag *__ceph_find_frag(struct ceph_inode_info *ci, 571 u32 f); 572 573 /* 574 * choose fragment for value @v. copy frag content to pfrag, if leaf 575 * exists 576 */ 577 extern u32 ceph_choose_frag(struct ceph_inode_info *ci, u32 v, 578 struct ceph_inode_frag *pfrag, 579 int *found); 580 581 static inline struct ceph_dentry_info *ceph_dentry(struct dentry *dentry) 582 { 583 return (struct ceph_dentry_info *)dentry->d_fsdata; 584 } 585 586 /* 587 * caps helpers 588 */ 589 static inline bool __ceph_is_any_real_caps(struct ceph_inode_info *ci) 590 { 591 return !RB_EMPTY_ROOT(&ci->i_caps); 592 } 593 594 extern int __ceph_caps_issued(struct ceph_inode_info *ci, int *implemented); 595 extern int __ceph_caps_issued_mask(struct ceph_inode_info *ci, int mask, int t); 596 extern int __ceph_caps_issued_other(struct ceph_inode_info *ci, 597 struct ceph_cap *cap); 598 599 static inline int ceph_caps_issued(struct ceph_inode_info *ci) 600 { 601 int issued; 602 spin_lock(&ci->i_ceph_lock); 603 issued = __ceph_caps_issued(ci, NULL); 604 spin_unlock(&ci->i_ceph_lock); 605 return issued; 606 } 607 608 static inline int ceph_caps_issued_mask(struct ceph_inode_info *ci, int mask, 609 int touch) 610 { 611 int r; 612 spin_lock(&ci->i_ceph_lock); 613 r = __ceph_caps_issued_mask(ci, mask, touch); 614 spin_unlock(&ci->i_ceph_lock); 615 return r; 616 } 617 618 static inline int __ceph_caps_dirty(struct ceph_inode_info *ci) 619 { 620 return ci->i_dirty_caps | ci->i_flushing_caps; 621 } 622 extern struct ceph_cap_flush *ceph_alloc_cap_flush(void); 623 extern void ceph_free_cap_flush(struct ceph_cap_flush *cf); 624 extern int __ceph_mark_dirty_caps(struct ceph_inode_info *ci, int mask, 625 struct ceph_cap_flush **pcf); 626 627 extern int __ceph_caps_revoking_other(struct ceph_inode_info *ci, 628 struct ceph_cap *ocap, int mask); 629 extern int ceph_caps_revoking(struct ceph_inode_info *ci, int mask); 630 extern int __ceph_caps_used(struct ceph_inode_info *ci); 631 632 extern int __ceph_caps_file_wanted(struct ceph_inode_info *ci); 633 634 /* 635 * wanted, by virtue of open file modes AND cap refs (buffered/cached data) 636 */ 637 static inline int __ceph_caps_wanted(struct ceph_inode_info *ci) 638 { 639 int w = __ceph_caps_file_wanted(ci) | __ceph_caps_used(ci); 640 if (w & CEPH_CAP_FILE_BUFFER) 641 w |= CEPH_CAP_FILE_EXCL; /* we want EXCL if dirty data */ 642 return w; 643 } 644 645 /* what the mds thinks we want */ 646 extern int __ceph_caps_mds_wanted(struct ceph_inode_info *ci, bool check); 647 648 extern void ceph_caps_init(struct ceph_mds_client *mdsc); 649 extern void ceph_caps_finalize(struct ceph_mds_client *mdsc); 650 extern void ceph_adjust_min_caps(struct ceph_mds_client *mdsc, int delta); 651 extern void ceph_reserve_caps(struct ceph_mds_client *mdsc, 652 struct ceph_cap_reservation *ctx, int need); 653 extern int ceph_unreserve_caps(struct ceph_mds_client *mdsc, 654 struct ceph_cap_reservation *ctx); 655 extern void ceph_reservation_status(struct ceph_fs_client *client, 656 int *total, int *avail, int *used, 657 int *reserved, int *min); 658 659 660 661 /* 662 * we keep buffered readdir results attached to file->private_data 663 */ 664 #define CEPH_F_SYNC 1 665 #define CEPH_F_ATEND 2 666 667 struct ceph_file_info { 668 short fmode; /* initialized on open */ 669 short flags; /* CEPH_F_* */ 670 671 /* readdir: position within the dir */ 672 u32 frag; 673 struct ceph_mds_request *last_readdir; 674 675 /* readdir: position within a frag */ 676 unsigned next_offset; /* offset of next chunk (last_name's + 1) */ 677 char *last_name; /* last entry in previous chunk */ 678 long long dir_release_count; 679 long long dir_ordered_count; 680 int readdir_cache_idx; 681 682 /* used for -o dirstat read() on directory thing */ 683 char *dir_info; 684 int dir_info_len; 685 }; 686 687 struct ceph_readdir_cache_control { 688 struct page *page; 689 struct dentry **dentries; 690 int index; 691 }; 692 693 /* 694 * A "snap realm" describes a subset of the file hierarchy sharing 695 * the same set of snapshots that apply to it. The realms themselves 696 * are organized into a hierarchy, such that children inherit (some of) 697 * the snapshots of their parents. 698 * 699 * All inodes within the realm that have capabilities are linked into a 700 * per-realm list. 701 */ 702 struct ceph_snap_realm { 703 u64 ino; 704 atomic_t nref; 705 struct rb_node node; 706 707 u64 created, seq; 708 u64 parent_ino; 709 u64 parent_since; /* snapid when our current parent became so */ 710 711 u64 *prior_parent_snaps; /* snaps inherited from any parents we */ 712 u32 num_prior_parent_snaps; /* had prior to parent_since */ 713 u64 *snaps; /* snaps specific to this realm */ 714 u32 num_snaps; 715 716 struct ceph_snap_realm *parent; 717 struct list_head children; /* list of child realms */ 718 struct list_head child_item; 719 720 struct list_head empty_item; /* if i have ref==0 */ 721 722 struct list_head dirty_item; /* if realm needs new context */ 723 724 /* the current set of snaps for this realm */ 725 struct ceph_snap_context *cached_context; 726 727 struct list_head inodes_with_caps; 728 spinlock_t inodes_with_caps_lock; 729 }; 730 731 static inline int default_congestion_kb(void) 732 { 733 int congestion_kb; 734 735 /* 736 * Copied from NFS 737 * 738 * congestion size, scale with available memory. 739 * 740 * 64MB: 8192k 741 * 128MB: 11585k 742 * 256MB: 16384k 743 * 512MB: 23170k 744 * 1GB: 32768k 745 * 2GB: 46340k 746 * 4GB: 65536k 747 * 8GB: 92681k 748 * 16GB: 131072k 749 * 750 * This allows larger machines to have larger/more transfers. 751 * Limit the default to 256M 752 */ 753 congestion_kb = (16*int_sqrt(totalram_pages)) << (PAGE_SHIFT-10); 754 if (congestion_kb > 256*1024) 755 congestion_kb = 256*1024; 756 757 return congestion_kb; 758 } 759 760 761 762 /* snap.c */ 763 struct ceph_snap_realm *ceph_lookup_snap_realm(struct ceph_mds_client *mdsc, 764 u64 ino); 765 extern void ceph_get_snap_realm(struct ceph_mds_client *mdsc, 766 struct ceph_snap_realm *realm); 767 extern void ceph_put_snap_realm(struct ceph_mds_client *mdsc, 768 struct ceph_snap_realm *realm); 769 extern int ceph_update_snap_trace(struct ceph_mds_client *m, 770 void *p, void *e, bool deletion, 771 struct ceph_snap_realm **realm_ret); 772 extern void ceph_handle_snap(struct ceph_mds_client *mdsc, 773 struct ceph_mds_session *session, 774 struct ceph_msg *msg); 775 extern void ceph_queue_cap_snap(struct ceph_inode_info *ci); 776 extern int __ceph_finish_cap_snap(struct ceph_inode_info *ci, 777 struct ceph_cap_snap *capsnap); 778 extern void ceph_cleanup_empty_realms(struct ceph_mds_client *mdsc); 779 780 /* 781 * a cap_snap is "pending" if it is still awaiting an in-progress 782 * sync write (that may/may not still update size, mtime, etc.). 783 */ 784 static inline bool __ceph_have_pending_cap_snap(struct ceph_inode_info *ci) 785 { 786 return !list_empty(&ci->i_cap_snaps) && 787 list_last_entry(&ci->i_cap_snaps, struct ceph_cap_snap, 788 ci_item)->writing; 789 } 790 791 /* inode.c */ 792 extern const struct inode_operations ceph_file_iops; 793 794 extern struct inode *ceph_alloc_inode(struct super_block *sb); 795 extern void ceph_destroy_inode(struct inode *inode); 796 extern int ceph_drop_inode(struct inode *inode); 797 798 extern struct inode *ceph_get_inode(struct super_block *sb, 799 struct ceph_vino vino); 800 extern struct inode *ceph_get_snapdir(struct inode *parent); 801 extern int ceph_fill_file_size(struct inode *inode, int issued, 802 u32 truncate_seq, u64 truncate_size, u64 size); 803 extern void ceph_fill_file_time(struct inode *inode, int issued, 804 u64 time_warp_seq, struct timespec *ctime, 805 struct timespec *mtime, struct timespec *atime); 806 extern int ceph_fill_trace(struct super_block *sb, 807 struct ceph_mds_request *req); 808 extern int ceph_readdir_prepopulate(struct ceph_mds_request *req, 809 struct ceph_mds_session *session); 810 811 extern int ceph_inode_holds_cap(struct inode *inode, int mask); 812 813 extern bool ceph_inode_set_size(struct inode *inode, loff_t size); 814 extern void __ceph_do_pending_vmtruncate(struct inode *inode); 815 extern void ceph_queue_vmtruncate(struct inode *inode); 816 817 extern void ceph_queue_invalidate(struct inode *inode); 818 extern void ceph_queue_writeback(struct inode *inode); 819 820 extern int __ceph_do_getattr(struct inode *inode, struct page *locked_page, 821 int mask, bool force); 822 static inline int ceph_do_getattr(struct inode *inode, int mask, bool force) 823 { 824 return __ceph_do_getattr(inode, NULL, mask, force); 825 } 826 extern int ceph_permission(struct inode *inode, int mask); 827 extern int __ceph_setattr(struct inode *inode, struct iattr *attr); 828 extern int ceph_setattr(struct dentry *dentry, struct iattr *attr); 829 extern int ceph_getattr(const struct path *path, struct kstat *stat, 830 u32 request_mask, unsigned int flags); 831 832 /* xattr.c */ 833 int __ceph_setxattr(struct inode *, const char *, const void *, size_t, int); 834 ssize_t __ceph_getxattr(struct inode *, const char *, void *, size_t); 835 extern ssize_t ceph_listxattr(struct dentry *, char *, size_t); 836 extern void __ceph_build_xattrs_blob(struct ceph_inode_info *ci); 837 extern void __ceph_destroy_xattrs(struct ceph_inode_info *ci); 838 extern void __init ceph_xattr_init(void); 839 extern void ceph_xattr_exit(void); 840 extern const struct xattr_handler *ceph_xattr_handlers[]; 841 842 #ifdef CONFIG_SECURITY 843 extern bool ceph_security_xattr_deadlock(struct inode *in); 844 extern bool ceph_security_xattr_wanted(struct inode *in); 845 #else 846 static inline bool ceph_security_xattr_deadlock(struct inode *in) 847 { 848 return false; 849 } 850 static inline bool ceph_security_xattr_wanted(struct inode *in) 851 { 852 return false; 853 } 854 #endif 855 856 /* acl.c */ 857 struct ceph_acls_info { 858 void *default_acl; 859 void *acl; 860 struct ceph_pagelist *pagelist; 861 }; 862 863 #ifdef CONFIG_CEPH_FS_POSIX_ACL 864 865 struct posix_acl *ceph_get_acl(struct inode *, int); 866 int ceph_set_acl(struct inode *inode, struct posix_acl *acl, int type); 867 int ceph_pre_init_acls(struct inode *dir, umode_t *mode, 868 struct ceph_acls_info *info); 869 void ceph_init_inode_acls(struct inode *inode, struct ceph_acls_info *info); 870 void ceph_release_acls_info(struct ceph_acls_info *info); 871 872 static inline void ceph_forget_all_cached_acls(struct inode *inode) 873 { 874 forget_all_cached_acls(inode); 875 } 876 877 #else 878 879 #define ceph_get_acl NULL 880 #define ceph_set_acl NULL 881 882 static inline int ceph_pre_init_acls(struct inode *dir, umode_t *mode, 883 struct ceph_acls_info *info) 884 { 885 return 0; 886 } 887 static inline void ceph_init_inode_acls(struct inode *inode, 888 struct ceph_acls_info *info) 889 { 890 } 891 static inline void ceph_release_acls_info(struct ceph_acls_info *info) 892 { 893 } 894 static inline int ceph_acl_chmod(struct dentry *dentry, struct inode *inode) 895 { 896 return 0; 897 } 898 899 static inline void ceph_forget_all_cached_acls(struct inode *inode) 900 { 901 } 902 903 #endif 904 905 /* caps.c */ 906 extern const char *ceph_cap_string(int c); 907 extern void ceph_handle_caps(struct ceph_mds_session *session, 908 struct ceph_msg *msg); 909 extern struct ceph_cap *ceph_get_cap(struct ceph_mds_client *mdsc, 910 struct ceph_cap_reservation *ctx); 911 extern void ceph_add_cap(struct inode *inode, 912 struct ceph_mds_session *session, u64 cap_id, 913 int fmode, unsigned issued, unsigned wanted, 914 unsigned cap, unsigned seq, u64 realmino, int flags, 915 struct ceph_cap **new_cap); 916 extern void __ceph_remove_cap(struct ceph_cap *cap, bool queue_release); 917 extern void ceph_put_cap(struct ceph_mds_client *mdsc, 918 struct ceph_cap *cap); 919 extern int ceph_is_any_caps(struct inode *inode); 920 921 extern void ceph_queue_caps_release(struct inode *inode); 922 extern int ceph_write_inode(struct inode *inode, struct writeback_control *wbc); 923 extern int ceph_fsync(struct file *file, loff_t start, loff_t end, 924 int datasync); 925 extern void ceph_early_kick_flushing_caps(struct ceph_mds_client *mdsc, 926 struct ceph_mds_session *session); 927 extern void ceph_kick_flushing_caps(struct ceph_mds_client *mdsc, 928 struct ceph_mds_session *session); 929 extern struct ceph_cap *ceph_get_cap_for_mds(struct ceph_inode_info *ci, 930 int mds); 931 extern int ceph_get_cap_mds(struct inode *inode); 932 extern void ceph_get_cap_refs(struct ceph_inode_info *ci, int caps); 933 extern void ceph_put_cap_refs(struct ceph_inode_info *ci, int had); 934 extern void ceph_put_wrbuffer_cap_refs(struct ceph_inode_info *ci, int nr, 935 struct ceph_snap_context *snapc); 936 extern void ceph_flush_snaps(struct ceph_inode_info *ci, 937 struct ceph_mds_session **psession); 938 extern bool __ceph_should_report_size(struct ceph_inode_info *ci); 939 extern void ceph_check_caps(struct ceph_inode_info *ci, int flags, 940 struct ceph_mds_session *session); 941 extern void ceph_check_delayed_caps(struct ceph_mds_client *mdsc); 942 extern void ceph_flush_dirty_caps(struct ceph_mds_client *mdsc); 943 944 extern int ceph_encode_inode_release(void **p, struct inode *inode, 945 int mds, int drop, int unless, int force); 946 extern int ceph_encode_dentry_release(void **p, struct dentry *dn, 947 struct inode *dir, 948 int mds, int drop, int unless); 949 950 extern int ceph_get_caps(struct ceph_inode_info *ci, int need, int want, 951 loff_t endoff, int *got, struct page **pinned_page); 952 extern int ceph_try_get_caps(struct ceph_inode_info *ci, 953 int need, int want, int *got); 954 955 /* for counting open files by mode */ 956 extern void __ceph_get_fmode(struct ceph_inode_info *ci, int mode); 957 extern void ceph_put_fmode(struct ceph_inode_info *ci, int mode); 958 959 /* addr.c */ 960 extern const struct address_space_operations ceph_aops; 961 extern int ceph_mmap(struct file *file, struct vm_area_struct *vma); 962 extern int ceph_uninline_data(struct file *filp, struct page *locked_page); 963 extern int ceph_pool_perm_check(struct ceph_inode_info *ci, int need); 964 extern void ceph_pool_perm_destroy(struct ceph_mds_client* mdsc); 965 966 /* file.c */ 967 extern const struct file_operations ceph_file_fops; 968 969 extern int ceph_renew_caps(struct inode *inode); 970 extern int ceph_open(struct inode *inode, struct file *file); 971 extern int ceph_atomic_open(struct inode *dir, struct dentry *dentry, 972 struct file *file, unsigned flags, umode_t mode, 973 int *opened); 974 extern int ceph_release(struct inode *inode, struct file *filp); 975 extern void ceph_fill_inline_data(struct inode *inode, struct page *locked_page, 976 char *data, size_t len); 977 978 /* dir.c */ 979 extern const struct file_operations ceph_dir_fops; 980 extern const struct file_operations ceph_snapdir_fops; 981 extern const struct inode_operations ceph_dir_iops; 982 extern const struct inode_operations ceph_snapdir_iops; 983 extern const struct dentry_operations ceph_dentry_ops; 984 985 extern loff_t ceph_make_fpos(unsigned high, unsigned off, bool hash_order); 986 extern int ceph_handle_notrace_create(struct inode *dir, struct dentry *dentry); 987 extern int ceph_handle_snapdir(struct ceph_mds_request *req, 988 struct dentry *dentry, int err); 989 extern struct dentry *ceph_finish_lookup(struct ceph_mds_request *req, 990 struct dentry *dentry, int err); 991 992 extern void ceph_dentry_lru_add(struct dentry *dn); 993 extern void ceph_dentry_lru_touch(struct dentry *dn); 994 extern void ceph_dentry_lru_del(struct dentry *dn); 995 extern void ceph_invalidate_dentry_lease(struct dentry *dentry); 996 extern unsigned ceph_dentry_hash(struct inode *dir, struct dentry *dn); 997 extern void ceph_readdir_cache_release(struct ceph_readdir_cache_control *ctl); 998 999 /* ioctl.c */ 1000 extern long ceph_ioctl(struct file *file, unsigned int cmd, unsigned long arg); 1001 1002 /* export.c */ 1003 extern const struct export_operations ceph_export_ops; 1004 1005 /* locks.c */ 1006 extern __init void ceph_flock_init(void); 1007 extern int ceph_lock(struct file *file, int cmd, struct file_lock *fl); 1008 extern int ceph_flock(struct file *file, int cmd, struct file_lock *fl); 1009 extern void ceph_count_locks(struct inode *inode, int *p_num, int *f_num); 1010 extern int ceph_encode_locks_to_buffer(struct inode *inode, 1011 struct ceph_filelock *flocks, 1012 int num_fcntl_locks, 1013 int num_flock_locks); 1014 extern int ceph_locks_to_pagelist(struct ceph_filelock *flocks, 1015 struct ceph_pagelist *pagelist, 1016 int num_fcntl_locks, int num_flock_locks); 1017 1018 /* debugfs.c */ 1019 extern int ceph_fs_debugfs_init(struct ceph_fs_client *client); 1020 extern void ceph_fs_debugfs_cleanup(struct ceph_fs_client *client); 1021 1022 #endif /* _FS_CEPH_SUPER_H */ 1023