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 u32 i_shared_gen; /* increment each time we get FILE_SHARED */ 356 u32 i_rdcache_gen; /* incremented each time we get FILE_CACHE. */ 357 u32 i_rdcache_revoking; /* RDCACHE gen to async invalidate, if any */ 358 359 struct list_head i_unsafe_dirops; /* uncommitted mds dir ops */ 360 struct list_head i_unsafe_iops; /* uncommitted mds inode ops */ 361 spinlock_t i_unsafe_lock; 362 363 struct ceph_snap_realm *i_snap_realm; /* snap realm (if caps) */ 364 int i_snap_realm_counter; /* snap realm (if caps) */ 365 struct list_head i_snap_realm_item; 366 struct list_head i_snap_flush_item; 367 368 struct work_struct i_wb_work; /* writeback work */ 369 struct work_struct i_pg_inv_work; /* page invalidation work */ 370 371 struct work_struct i_vmtruncate_work; 372 373 #ifdef CONFIG_CEPH_FSCACHE 374 struct fscache_cookie *fscache; 375 u32 i_fscache_gen; 376 #endif 377 struct inode vfs_inode; /* at end */ 378 }; 379 380 static inline struct ceph_inode_info *ceph_inode(struct inode *inode) 381 { 382 return container_of(inode, struct ceph_inode_info, vfs_inode); 383 } 384 385 static inline struct ceph_fs_client *ceph_inode_to_client(struct inode *inode) 386 { 387 return (struct ceph_fs_client *)inode->i_sb->s_fs_info; 388 } 389 390 static inline struct ceph_fs_client *ceph_sb_to_client(struct super_block *sb) 391 { 392 return (struct ceph_fs_client *)sb->s_fs_info; 393 } 394 395 static inline struct ceph_vino ceph_vino(struct inode *inode) 396 { 397 return ceph_inode(inode)->i_vino; 398 } 399 400 /* 401 * ino_t is <64 bits on many architectures, blech. 402 * 403 * i_ino (kernel inode) st_ino (userspace) 404 * i386 32 32 405 * x86_64+ino32 64 32 406 * x86_64 64 64 407 */ 408 static inline u32 ceph_ino_to_ino32(__u64 vino) 409 { 410 u32 ino = vino & 0xffffffff; 411 ino ^= vino >> 32; 412 if (!ino) 413 ino = 2; 414 return ino; 415 } 416 417 /* 418 * kernel i_ino value 419 */ 420 static inline ino_t ceph_vino_to_ino(struct ceph_vino vino) 421 { 422 #if BITS_PER_LONG == 32 423 return ceph_ino_to_ino32(vino.ino); 424 #else 425 return (ino_t)vino.ino; 426 #endif 427 } 428 429 /* 430 * user-visible ino (stat, filldir) 431 */ 432 #if BITS_PER_LONG == 32 433 static inline ino_t ceph_translate_ino(struct super_block *sb, ino_t ino) 434 { 435 return ino; 436 } 437 #else 438 static inline ino_t ceph_translate_ino(struct super_block *sb, ino_t ino) 439 { 440 if (ceph_test_mount_opt(ceph_sb_to_client(sb), INO32)) 441 ino = ceph_ino_to_ino32(ino); 442 return ino; 443 } 444 #endif 445 446 447 /* for printf-style formatting */ 448 #define ceph_vinop(i) ceph_inode(i)->i_vino.ino, ceph_inode(i)->i_vino.snap 449 450 static inline u64 ceph_ino(struct inode *inode) 451 { 452 return ceph_inode(inode)->i_vino.ino; 453 } 454 static inline u64 ceph_snap(struct inode *inode) 455 { 456 return ceph_inode(inode)->i_vino.snap; 457 } 458 459 static inline int ceph_ino_compare(struct inode *inode, void *data) 460 { 461 struct ceph_vino *pvino = (struct ceph_vino *)data; 462 struct ceph_inode_info *ci = ceph_inode(inode); 463 return ci->i_vino.ino == pvino->ino && 464 ci->i_vino.snap == pvino->snap; 465 } 466 467 static inline struct inode *ceph_find_inode(struct super_block *sb, 468 struct ceph_vino vino) 469 { 470 ino_t t = ceph_vino_to_ino(vino); 471 return ilookup5(sb, t, ceph_ino_compare, &vino); 472 } 473 474 475 /* 476 * Ceph inode. 477 */ 478 #define CEPH_I_DIR_ORDERED (1 << 0) /* dentries in dir are ordered */ 479 #define CEPH_I_NODELAY (1 << 1) /* do not delay cap release */ 480 #define CEPH_I_FLUSH (1 << 2) /* do not delay flush of dirty metadata */ 481 #define CEPH_I_NOFLUSH (1 << 3) /* do not flush dirty caps */ 482 #define CEPH_I_POOL_PERM (1 << 4) /* pool rd/wr bits are valid */ 483 #define CEPH_I_POOL_RD (1 << 5) /* can read from pool */ 484 #define CEPH_I_POOL_WR (1 << 6) /* can write to pool */ 485 #define CEPH_I_SEC_INITED (1 << 7) /* security initialized */ 486 #define CEPH_I_CAP_DROPPED (1 << 8) /* caps were forcibly dropped */ 487 #define CEPH_I_KICK_FLUSH (1 << 9) /* kick flushing caps */ 488 #define CEPH_I_FLUSH_SNAPS (1 << 10) /* need flush snapss */ 489 #define CEPH_I_ERROR_WRITE (1 << 11) /* have seen write errors */ 490 491 /* 492 * We set the ERROR_WRITE bit when we start seeing write errors on an inode 493 * and then clear it when they start succeeding. Note that we do a lockless 494 * check first, and only take the lock if it looks like it needs to be changed. 495 * The write submission code just takes this as a hint, so we're not too 496 * worried if a few slip through in either direction. 497 */ 498 static inline void ceph_set_error_write(struct ceph_inode_info *ci) 499 { 500 if (!(READ_ONCE(ci->i_ceph_flags) & CEPH_I_ERROR_WRITE)) { 501 spin_lock(&ci->i_ceph_lock); 502 ci->i_ceph_flags |= CEPH_I_ERROR_WRITE; 503 spin_unlock(&ci->i_ceph_lock); 504 } 505 } 506 507 static inline void ceph_clear_error_write(struct ceph_inode_info *ci) 508 { 509 if (READ_ONCE(ci->i_ceph_flags) & CEPH_I_ERROR_WRITE) { 510 spin_lock(&ci->i_ceph_lock); 511 ci->i_ceph_flags &= ~CEPH_I_ERROR_WRITE; 512 spin_unlock(&ci->i_ceph_lock); 513 } 514 } 515 516 static inline void __ceph_dir_set_complete(struct ceph_inode_info *ci, 517 long long release_count, 518 long long ordered_count) 519 { 520 smp_mb__before_atomic(); 521 atomic64_set(&ci->i_complete_seq[0], release_count); 522 atomic64_set(&ci->i_complete_seq[1], ordered_count); 523 } 524 525 static inline void __ceph_dir_clear_complete(struct ceph_inode_info *ci) 526 { 527 atomic64_inc(&ci->i_release_count); 528 } 529 530 static inline void __ceph_dir_clear_ordered(struct ceph_inode_info *ci) 531 { 532 atomic64_inc(&ci->i_ordered_count); 533 } 534 535 static inline bool __ceph_dir_is_complete(struct ceph_inode_info *ci) 536 { 537 return atomic64_read(&ci->i_complete_seq[0]) == 538 atomic64_read(&ci->i_release_count); 539 } 540 541 static inline bool __ceph_dir_is_complete_ordered(struct ceph_inode_info *ci) 542 { 543 return atomic64_read(&ci->i_complete_seq[0]) == 544 atomic64_read(&ci->i_release_count) && 545 atomic64_read(&ci->i_complete_seq[1]) == 546 atomic64_read(&ci->i_ordered_count); 547 } 548 549 static inline void ceph_dir_clear_complete(struct inode *inode) 550 { 551 __ceph_dir_clear_complete(ceph_inode(inode)); 552 } 553 554 static inline void ceph_dir_clear_ordered(struct inode *inode) 555 { 556 __ceph_dir_clear_ordered(ceph_inode(inode)); 557 } 558 559 static inline bool ceph_dir_is_complete_ordered(struct inode *inode) 560 { 561 bool ret = __ceph_dir_is_complete_ordered(ceph_inode(inode)); 562 smp_rmb(); 563 return ret; 564 } 565 566 /* find a specific frag @f */ 567 extern struct ceph_inode_frag *__ceph_find_frag(struct ceph_inode_info *ci, 568 u32 f); 569 570 /* 571 * choose fragment for value @v. copy frag content to pfrag, if leaf 572 * exists 573 */ 574 extern u32 ceph_choose_frag(struct ceph_inode_info *ci, u32 v, 575 struct ceph_inode_frag *pfrag, 576 int *found); 577 578 static inline struct ceph_dentry_info *ceph_dentry(struct dentry *dentry) 579 { 580 return (struct ceph_dentry_info *)dentry->d_fsdata; 581 } 582 583 /* 584 * caps helpers 585 */ 586 static inline bool __ceph_is_any_real_caps(struct ceph_inode_info *ci) 587 { 588 return !RB_EMPTY_ROOT(&ci->i_caps); 589 } 590 591 extern int __ceph_caps_issued(struct ceph_inode_info *ci, int *implemented); 592 extern int __ceph_caps_issued_mask(struct ceph_inode_info *ci, int mask, int t); 593 extern int __ceph_caps_issued_other(struct ceph_inode_info *ci, 594 struct ceph_cap *cap); 595 596 static inline int ceph_caps_issued(struct ceph_inode_info *ci) 597 { 598 int issued; 599 spin_lock(&ci->i_ceph_lock); 600 issued = __ceph_caps_issued(ci, NULL); 601 spin_unlock(&ci->i_ceph_lock); 602 return issued; 603 } 604 605 static inline int ceph_caps_issued_mask(struct ceph_inode_info *ci, int mask, 606 int touch) 607 { 608 int r; 609 spin_lock(&ci->i_ceph_lock); 610 r = __ceph_caps_issued_mask(ci, mask, touch); 611 spin_unlock(&ci->i_ceph_lock); 612 return r; 613 } 614 615 static inline int __ceph_caps_dirty(struct ceph_inode_info *ci) 616 { 617 return ci->i_dirty_caps | ci->i_flushing_caps; 618 } 619 extern struct ceph_cap_flush *ceph_alloc_cap_flush(void); 620 extern void ceph_free_cap_flush(struct ceph_cap_flush *cf); 621 extern int __ceph_mark_dirty_caps(struct ceph_inode_info *ci, int mask, 622 struct ceph_cap_flush **pcf); 623 624 extern int __ceph_caps_revoking_other(struct ceph_inode_info *ci, 625 struct ceph_cap *ocap, int mask); 626 extern int ceph_caps_revoking(struct ceph_inode_info *ci, int mask); 627 extern int __ceph_caps_used(struct ceph_inode_info *ci); 628 629 extern int __ceph_caps_file_wanted(struct ceph_inode_info *ci); 630 631 /* 632 * wanted, by virtue of open file modes AND cap refs (buffered/cached data) 633 */ 634 static inline int __ceph_caps_wanted(struct ceph_inode_info *ci) 635 { 636 int w = __ceph_caps_file_wanted(ci) | __ceph_caps_used(ci); 637 if (w & CEPH_CAP_FILE_BUFFER) 638 w |= CEPH_CAP_FILE_EXCL; /* we want EXCL if dirty data */ 639 return w; 640 } 641 642 /* what the mds thinks we want */ 643 extern int __ceph_caps_mds_wanted(struct ceph_inode_info *ci, bool check); 644 645 extern void ceph_caps_init(struct ceph_mds_client *mdsc); 646 extern void ceph_caps_finalize(struct ceph_mds_client *mdsc); 647 extern void ceph_adjust_min_caps(struct ceph_mds_client *mdsc, int delta); 648 extern void ceph_reserve_caps(struct ceph_mds_client *mdsc, 649 struct ceph_cap_reservation *ctx, int need); 650 extern int ceph_unreserve_caps(struct ceph_mds_client *mdsc, 651 struct ceph_cap_reservation *ctx); 652 extern void ceph_reservation_status(struct ceph_fs_client *client, 653 int *total, int *avail, int *used, 654 int *reserved, int *min); 655 656 657 658 /* 659 * we keep buffered readdir results attached to file->private_data 660 */ 661 #define CEPH_F_SYNC 1 662 #define CEPH_F_ATEND 2 663 664 struct ceph_file_info { 665 short fmode; /* initialized on open */ 666 short flags; /* CEPH_F_* */ 667 668 /* readdir: position within the dir */ 669 u32 frag; 670 struct ceph_mds_request *last_readdir; 671 672 /* readdir: position within a frag */ 673 unsigned next_offset; /* offset of next chunk (last_name's + 1) */ 674 char *last_name; /* last entry in previous chunk */ 675 long long dir_release_count; 676 long long dir_ordered_count; 677 int readdir_cache_idx; 678 679 /* used for -o dirstat read() on directory thing */ 680 char *dir_info; 681 int dir_info_len; 682 }; 683 684 struct ceph_readdir_cache_control { 685 struct page *page; 686 struct dentry **dentries; 687 int index; 688 }; 689 690 /* 691 * A "snap realm" describes a subset of the file hierarchy sharing 692 * the same set of snapshots that apply to it. The realms themselves 693 * are organized into a hierarchy, such that children inherit (some of) 694 * the snapshots of their parents. 695 * 696 * All inodes within the realm that have capabilities are linked into a 697 * per-realm list. 698 */ 699 struct ceph_snap_realm { 700 u64 ino; 701 atomic_t nref; 702 struct rb_node node; 703 704 u64 created, seq; 705 u64 parent_ino; 706 u64 parent_since; /* snapid when our current parent became so */ 707 708 u64 *prior_parent_snaps; /* snaps inherited from any parents we */ 709 u32 num_prior_parent_snaps; /* had prior to parent_since */ 710 u64 *snaps; /* snaps specific to this realm */ 711 u32 num_snaps; 712 713 struct ceph_snap_realm *parent; 714 struct list_head children; /* list of child realms */ 715 struct list_head child_item; 716 717 struct list_head empty_item; /* if i have ref==0 */ 718 719 struct list_head dirty_item; /* if realm needs new context */ 720 721 /* the current set of snaps for this realm */ 722 struct ceph_snap_context *cached_context; 723 724 struct list_head inodes_with_caps; 725 spinlock_t inodes_with_caps_lock; 726 }; 727 728 static inline int default_congestion_kb(void) 729 { 730 int congestion_kb; 731 732 /* 733 * Copied from NFS 734 * 735 * congestion size, scale with available memory. 736 * 737 * 64MB: 8192k 738 * 128MB: 11585k 739 * 256MB: 16384k 740 * 512MB: 23170k 741 * 1GB: 32768k 742 * 2GB: 46340k 743 * 4GB: 65536k 744 * 8GB: 92681k 745 * 16GB: 131072k 746 * 747 * This allows larger machines to have larger/more transfers. 748 * Limit the default to 256M 749 */ 750 congestion_kb = (16*int_sqrt(totalram_pages)) << (PAGE_SHIFT-10); 751 if (congestion_kb > 256*1024) 752 congestion_kb = 256*1024; 753 754 return congestion_kb; 755 } 756 757 758 759 /* snap.c */ 760 struct ceph_snap_realm *ceph_lookup_snap_realm(struct ceph_mds_client *mdsc, 761 u64 ino); 762 extern void ceph_get_snap_realm(struct ceph_mds_client *mdsc, 763 struct ceph_snap_realm *realm); 764 extern void ceph_put_snap_realm(struct ceph_mds_client *mdsc, 765 struct ceph_snap_realm *realm); 766 extern int ceph_update_snap_trace(struct ceph_mds_client *m, 767 void *p, void *e, bool deletion, 768 struct ceph_snap_realm **realm_ret); 769 extern void ceph_handle_snap(struct ceph_mds_client *mdsc, 770 struct ceph_mds_session *session, 771 struct ceph_msg *msg); 772 extern void ceph_queue_cap_snap(struct ceph_inode_info *ci); 773 extern int __ceph_finish_cap_snap(struct ceph_inode_info *ci, 774 struct ceph_cap_snap *capsnap); 775 extern void ceph_cleanup_empty_realms(struct ceph_mds_client *mdsc); 776 777 /* 778 * a cap_snap is "pending" if it is still awaiting an in-progress 779 * sync write (that may/may not still update size, mtime, etc.). 780 */ 781 static inline bool __ceph_have_pending_cap_snap(struct ceph_inode_info *ci) 782 { 783 return !list_empty(&ci->i_cap_snaps) && 784 list_last_entry(&ci->i_cap_snaps, struct ceph_cap_snap, 785 ci_item)->writing; 786 } 787 788 /* inode.c */ 789 extern const struct inode_operations ceph_file_iops; 790 791 extern struct inode *ceph_alloc_inode(struct super_block *sb); 792 extern void ceph_destroy_inode(struct inode *inode); 793 extern int ceph_drop_inode(struct inode *inode); 794 795 extern struct inode *ceph_get_inode(struct super_block *sb, 796 struct ceph_vino vino); 797 extern struct inode *ceph_get_snapdir(struct inode *parent); 798 extern int ceph_fill_file_size(struct inode *inode, int issued, 799 u32 truncate_seq, u64 truncate_size, u64 size); 800 extern void ceph_fill_file_time(struct inode *inode, int issued, 801 u64 time_warp_seq, struct timespec *ctime, 802 struct timespec *mtime, struct timespec *atime); 803 extern int ceph_fill_trace(struct super_block *sb, 804 struct ceph_mds_request *req); 805 extern int ceph_readdir_prepopulate(struct ceph_mds_request *req, 806 struct ceph_mds_session *session); 807 808 extern int ceph_inode_holds_cap(struct inode *inode, int mask); 809 810 extern bool ceph_inode_set_size(struct inode *inode, loff_t size); 811 extern void __ceph_do_pending_vmtruncate(struct inode *inode); 812 extern void ceph_queue_vmtruncate(struct inode *inode); 813 814 extern void ceph_queue_invalidate(struct inode *inode); 815 extern void ceph_queue_writeback(struct inode *inode); 816 817 extern int __ceph_do_getattr(struct inode *inode, struct page *locked_page, 818 int mask, bool force); 819 static inline int ceph_do_getattr(struct inode *inode, int mask, bool force) 820 { 821 return __ceph_do_getattr(inode, NULL, mask, force); 822 } 823 extern int ceph_permission(struct inode *inode, int mask); 824 extern int __ceph_setattr(struct inode *inode, struct iattr *attr); 825 extern int ceph_setattr(struct dentry *dentry, struct iattr *attr); 826 extern int ceph_getattr(const struct path *path, struct kstat *stat, 827 u32 request_mask, unsigned int flags); 828 829 /* xattr.c */ 830 int __ceph_setxattr(struct inode *, const char *, const void *, size_t, int); 831 ssize_t __ceph_getxattr(struct inode *, const char *, void *, size_t); 832 extern ssize_t ceph_listxattr(struct dentry *, char *, size_t); 833 extern void __ceph_build_xattrs_blob(struct ceph_inode_info *ci); 834 extern void __ceph_destroy_xattrs(struct ceph_inode_info *ci); 835 extern void __init ceph_xattr_init(void); 836 extern void ceph_xattr_exit(void); 837 extern const struct xattr_handler *ceph_xattr_handlers[]; 838 839 #ifdef CONFIG_SECURITY 840 extern bool ceph_security_xattr_deadlock(struct inode *in); 841 extern bool ceph_security_xattr_wanted(struct inode *in); 842 #else 843 static inline bool ceph_security_xattr_deadlock(struct inode *in) 844 { 845 return false; 846 } 847 static inline bool ceph_security_xattr_wanted(struct inode *in) 848 { 849 return false; 850 } 851 #endif 852 853 /* acl.c */ 854 struct ceph_acls_info { 855 void *default_acl; 856 void *acl; 857 struct ceph_pagelist *pagelist; 858 }; 859 860 #ifdef CONFIG_CEPH_FS_POSIX_ACL 861 862 struct posix_acl *ceph_get_acl(struct inode *, int); 863 int ceph_set_acl(struct inode *inode, struct posix_acl *acl, int type); 864 int ceph_pre_init_acls(struct inode *dir, umode_t *mode, 865 struct ceph_acls_info *info); 866 void ceph_init_inode_acls(struct inode *inode, struct ceph_acls_info *info); 867 void ceph_release_acls_info(struct ceph_acls_info *info); 868 869 static inline void ceph_forget_all_cached_acls(struct inode *inode) 870 { 871 forget_all_cached_acls(inode); 872 } 873 874 #else 875 876 #define ceph_get_acl NULL 877 #define ceph_set_acl NULL 878 879 static inline int ceph_pre_init_acls(struct inode *dir, umode_t *mode, 880 struct ceph_acls_info *info) 881 { 882 return 0; 883 } 884 static inline void ceph_init_inode_acls(struct inode *inode, 885 struct ceph_acls_info *info) 886 { 887 } 888 static inline void ceph_release_acls_info(struct ceph_acls_info *info) 889 { 890 } 891 static inline int ceph_acl_chmod(struct dentry *dentry, struct inode *inode) 892 { 893 return 0; 894 } 895 896 static inline void ceph_forget_all_cached_acls(struct inode *inode) 897 { 898 } 899 900 #endif 901 902 /* caps.c */ 903 extern const char *ceph_cap_string(int c); 904 extern void ceph_handle_caps(struct ceph_mds_session *session, 905 struct ceph_msg *msg); 906 extern struct ceph_cap *ceph_get_cap(struct ceph_mds_client *mdsc, 907 struct ceph_cap_reservation *ctx); 908 extern void ceph_add_cap(struct inode *inode, 909 struct ceph_mds_session *session, u64 cap_id, 910 int fmode, unsigned issued, unsigned wanted, 911 unsigned cap, unsigned seq, u64 realmino, int flags, 912 struct ceph_cap **new_cap); 913 extern void __ceph_remove_cap(struct ceph_cap *cap, bool queue_release); 914 extern void ceph_put_cap(struct ceph_mds_client *mdsc, 915 struct ceph_cap *cap); 916 extern int ceph_is_any_caps(struct inode *inode); 917 918 extern void ceph_queue_caps_release(struct inode *inode); 919 extern int ceph_write_inode(struct inode *inode, struct writeback_control *wbc); 920 extern int ceph_fsync(struct file *file, loff_t start, loff_t end, 921 int datasync); 922 extern void ceph_early_kick_flushing_caps(struct ceph_mds_client *mdsc, 923 struct ceph_mds_session *session); 924 extern void ceph_kick_flushing_caps(struct ceph_mds_client *mdsc, 925 struct ceph_mds_session *session); 926 extern struct ceph_cap *ceph_get_cap_for_mds(struct ceph_inode_info *ci, 927 int mds); 928 extern int ceph_get_cap_mds(struct inode *inode); 929 extern void ceph_get_cap_refs(struct ceph_inode_info *ci, int caps); 930 extern void ceph_put_cap_refs(struct ceph_inode_info *ci, int had); 931 extern void ceph_put_wrbuffer_cap_refs(struct ceph_inode_info *ci, int nr, 932 struct ceph_snap_context *snapc); 933 extern void ceph_flush_snaps(struct ceph_inode_info *ci, 934 struct ceph_mds_session **psession); 935 extern bool __ceph_should_report_size(struct ceph_inode_info *ci); 936 extern void ceph_check_caps(struct ceph_inode_info *ci, int flags, 937 struct ceph_mds_session *session); 938 extern void ceph_check_delayed_caps(struct ceph_mds_client *mdsc); 939 extern void ceph_flush_dirty_caps(struct ceph_mds_client *mdsc); 940 941 extern int ceph_encode_inode_release(void **p, struct inode *inode, 942 int mds, int drop, int unless, int force); 943 extern int ceph_encode_dentry_release(void **p, struct dentry *dn, 944 struct inode *dir, 945 int mds, int drop, int unless); 946 947 extern int ceph_get_caps(struct ceph_inode_info *ci, int need, int want, 948 loff_t endoff, int *got, struct page **pinned_page); 949 extern int ceph_try_get_caps(struct ceph_inode_info *ci, 950 int need, int want, int *got); 951 952 /* for counting open files by mode */ 953 extern void __ceph_get_fmode(struct ceph_inode_info *ci, int mode); 954 extern void ceph_put_fmode(struct ceph_inode_info *ci, int mode); 955 956 /* addr.c */ 957 extern const struct address_space_operations ceph_aops; 958 extern int ceph_mmap(struct file *file, struct vm_area_struct *vma); 959 extern int ceph_uninline_data(struct file *filp, struct page *locked_page); 960 extern int ceph_pool_perm_check(struct ceph_inode_info *ci, int need); 961 extern void ceph_pool_perm_destroy(struct ceph_mds_client* mdsc); 962 963 /* file.c */ 964 extern const struct file_operations ceph_file_fops; 965 966 extern int ceph_renew_caps(struct inode *inode); 967 extern int ceph_open(struct inode *inode, struct file *file); 968 extern int ceph_atomic_open(struct inode *dir, struct dentry *dentry, 969 struct file *file, unsigned flags, umode_t mode, 970 int *opened); 971 extern int ceph_release(struct inode *inode, struct file *filp); 972 extern void ceph_fill_inline_data(struct inode *inode, struct page *locked_page, 973 char *data, size_t len); 974 975 /* dir.c */ 976 extern const struct file_operations ceph_dir_fops; 977 extern const struct file_operations ceph_snapdir_fops; 978 extern const struct inode_operations ceph_dir_iops; 979 extern const struct inode_operations ceph_snapdir_iops; 980 extern const struct dentry_operations ceph_dentry_ops; 981 982 extern loff_t ceph_make_fpos(unsigned high, unsigned off, bool hash_order); 983 extern int ceph_handle_notrace_create(struct inode *dir, struct dentry *dentry); 984 extern int ceph_handle_snapdir(struct ceph_mds_request *req, 985 struct dentry *dentry, int err); 986 extern struct dentry *ceph_finish_lookup(struct ceph_mds_request *req, 987 struct dentry *dentry, int err); 988 989 extern void ceph_dentry_lru_add(struct dentry *dn); 990 extern void ceph_dentry_lru_touch(struct dentry *dn); 991 extern void ceph_dentry_lru_del(struct dentry *dn); 992 extern void ceph_invalidate_dentry_lease(struct dentry *dentry); 993 extern unsigned ceph_dentry_hash(struct inode *dir, struct dentry *dn); 994 extern void ceph_readdir_cache_release(struct ceph_readdir_cache_control *ctl); 995 996 /* ioctl.c */ 997 extern long ceph_ioctl(struct file *file, unsigned int cmd, unsigned long arg); 998 999 /* export.c */ 1000 extern const struct export_operations ceph_export_ops; 1001 1002 /* locks.c */ 1003 extern __init void ceph_flock_init(void); 1004 extern int ceph_lock(struct file *file, int cmd, struct file_lock *fl); 1005 extern int ceph_flock(struct file *file, int cmd, struct file_lock *fl); 1006 extern void ceph_count_locks(struct inode *inode, int *p_num, int *f_num); 1007 extern int ceph_encode_locks_to_buffer(struct inode *inode, 1008 struct ceph_filelock *flocks, 1009 int num_fcntl_locks, 1010 int num_flock_locks); 1011 extern int ceph_locks_to_pagelist(struct ceph_filelock *flocks, 1012 struct ceph_pagelist *pagelist, 1013 int num_fcntl_locks, int num_flock_locks); 1014 extern int lock_to_ceph_filelock(struct file_lock *fl, struct ceph_filelock *c); 1015 1016 /* debugfs.c */ 1017 extern int ceph_fs_debugfs_init(struct ceph_fs_client *client); 1018 extern void ceph_fs_debugfs_cleanup(struct ceph_fs_client *client); 1019 1020 #endif /* _FS_CEPH_SUPER_H */ 1021