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 #define CEPH_MOUNT_OPT_NOQUOTADF (1<<13) /* no root dir quota in statfs */ 43 #define CEPH_MOUNT_OPT_NOCOPYFROM (1<<14) /* don't use RADOS 'copy-from' op */ 44 45 #define CEPH_MOUNT_OPT_DEFAULT \ 46 (CEPH_MOUNT_OPT_DCACHE | \ 47 CEPH_MOUNT_OPT_NOCOPYFROM) 48 49 #define ceph_set_mount_opt(fsc, opt) \ 50 (fsc)->mount_options->flags |= CEPH_MOUNT_OPT_##opt; 51 #define ceph_test_mount_opt(fsc, opt) \ 52 (!!((fsc)->mount_options->flags & CEPH_MOUNT_OPT_##opt)) 53 54 /* max size of osd read request, limited by libceph */ 55 #define CEPH_MAX_READ_SIZE CEPH_MSG_MAX_DATA_LEN 56 /* osd has a configurable limitaion of max write size. 57 * CEPH_MSG_MAX_DATA_LEN should be small enough. */ 58 #define CEPH_MAX_WRITE_SIZE CEPH_MSG_MAX_DATA_LEN 59 #define CEPH_RASIZE_DEFAULT (8192*1024) /* max readahead */ 60 #define CEPH_MAX_READDIR_DEFAULT 1024 61 #define CEPH_MAX_READDIR_BYTES_DEFAULT (512*1024) 62 #define CEPH_SNAPDIRNAME_DEFAULT ".snap" 63 64 /* 65 * Delay telling the MDS we no longer want caps, in case we reopen 66 * the file. Delay a minimum amount of time, even if we send a cap 67 * message for some other reason. Otherwise, take the oppotunity to 68 * update the mds to avoid sending another message later. 69 */ 70 #define CEPH_CAPS_WANTED_DELAY_MIN_DEFAULT 5 /* cap release delay */ 71 #define CEPH_CAPS_WANTED_DELAY_MAX_DEFAULT 60 /* cap release delay */ 72 73 struct ceph_mount_options { 74 int flags; 75 int sb_flags; 76 77 int wsize; /* max write size */ 78 int rsize; /* max read size */ 79 int rasize; /* max readahead */ 80 int congestion_kb; /* max writeback in flight */ 81 int caps_wanted_delay_min, caps_wanted_delay_max; 82 int caps_max; 83 int max_readdir; /* max readdir result (entires) */ 84 int max_readdir_bytes; /* max readdir result (bytes) */ 85 86 /* 87 * everything above this point can be memcmp'd; everything below 88 * is handled in compare_mount_options() 89 */ 90 91 char *snapdir_name; /* default ".snap" */ 92 char *mds_namespace; /* default NULL */ 93 char *server_path; /* default "/" */ 94 char *fscache_uniq; /* default NULL */ 95 }; 96 97 struct ceph_fs_client { 98 struct super_block *sb; 99 100 struct ceph_mount_options *mount_options; 101 struct ceph_client *client; 102 103 unsigned long mount_state; 104 loff_t max_file_size; 105 106 struct ceph_mds_client *mdsc; 107 108 /* writeback */ 109 mempool_t *wb_pagevec_pool; 110 atomic_long_t writeback_count; 111 112 struct workqueue_struct *wb_wq; 113 struct workqueue_struct *pg_inv_wq; 114 struct workqueue_struct *trunc_wq; 115 struct workqueue_struct *cap_wq; 116 117 #ifdef CONFIG_DEBUG_FS 118 struct dentry *debugfs_dentry_lru, *debugfs_caps; 119 struct dentry *debugfs_congestion_kb; 120 struct dentry *debugfs_bdi; 121 struct dentry *debugfs_mdsc, *debugfs_mdsmap; 122 struct dentry *debugfs_mds_sessions; 123 #endif 124 125 #ifdef CONFIG_CEPH_FSCACHE 126 struct fscache_cookie *fscache; 127 #endif 128 }; 129 130 131 /* 132 * File i/o capability. This tracks shared state with the metadata 133 * server that allows us to cache or writeback attributes or to read 134 * and write data. For any given inode, we should have one or more 135 * capabilities, one issued by each metadata server, and our 136 * cumulative access is the OR of all issued capabilities. 137 * 138 * Each cap is referenced by the inode's i_caps rbtree and by per-mds 139 * session capability lists. 140 */ 141 struct ceph_cap { 142 struct ceph_inode_info *ci; 143 struct rb_node ci_node; /* per-ci cap tree */ 144 struct ceph_mds_session *session; 145 struct list_head session_caps; /* per-session caplist */ 146 u64 cap_id; /* unique cap id (mds provided) */ 147 union { 148 /* in-use caps */ 149 struct { 150 int issued; /* latest, from the mds */ 151 int implemented; /* implemented superset of 152 issued (for revocation) */ 153 int mds, mds_wanted; 154 }; 155 /* caps to release */ 156 struct { 157 u64 cap_ino; 158 int queue_release; 159 }; 160 }; 161 u32 seq, issue_seq, mseq; 162 u32 cap_gen; /* active/stale cycle */ 163 unsigned long last_used; 164 struct list_head caps_item; 165 }; 166 167 #define CHECK_CAPS_NODELAY 1 /* do not delay any further */ 168 #define CHECK_CAPS_AUTHONLY 2 /* only check auth cap */ 169 #define CHECK_CAPS_FLUSH 4 /* flush any dirty caps */ 170 171 struct ceph_cap_flush { 172 u64 tid; 173 int caps; /* 0 means capsnap */ 174 bool wake; /* wake up flush waiters when finish ? */ 175 struct list_head g_list; // global 176 struct list_head i_list; // per inode 177 }; 178 179 /* 180 * Snapped cap state that is pending flush to mds. When a snapshot occurs, 181 * we first complete any in-process sync writes and writeback any dirty 182 * data before flushing the snapped state (tracked here) back to the MDS. 183 */ 184 struct ceph_cap_snap { 185 refcount_t nref; 186 struct list_head ci_item; 187 188 struct ceph_cap_flush cap_flush; 189 190 u64 follows; 191 int issued, dirty; 192 struct ceph_snap_context *context; 193 194 umode_t mode; 195 kuid_t uid; 196 kgid_t gid; 197 198 struct ceph_buffer *xattr_blob; 199 u64 xattr_version; 200 201 u64 size; 202 struct timespec64 mtime, atime, ctime; 203 u64 time_warp_seq; 204 u64 truncate_size; 205 u32 truncate_seq; 206 int writing; /* a sync write is still in progress */ 207 int dirty_pages; /* dirty pages awaiting writeback */ 208 bool inline_data; 209 bool need_flush; 210 }; 211 212 static inline void ceph_put_cap_snap(struct ceph_cap_snap *capsnap) 213 { 214 if (refcount_dec_and_test(&capsnap->nref)) { 215 if (capsnap->xattr_blob) 216 ceph_buffer_put(capsnap->xattr_blob); 217 kfree(capsnap); 218 } 219 } 220 221 /* 222 * The frag tree describes how a directory is fragmented, potentially across 223 * multiple metadata servers. It is also used to indicate points where 224 * metadata authority is delegated, and whether/where metadata is replicated. 225 * 226 * A _leaf_ frag will be present in the i_fragtree IFF there is 227 * delegation info. That is, if mds >= 0 || ndist > 0. 228 */ 229 #define CEPH_MAX_DIRFRAG_REP 4 230 231 struct ceph_inode_frag { 232 struct rb_node node; 233 234 /* fragtree state */ 235 u32 frag; 236 int split_by; /* i.e. 2^(split_by) children */ 237 238 /* delegation and replication info */ 239 int mds; /* -1 if same authority as parent */ 240 int ndist; /* >0 if replicated */ 241 int dist[CEPH_MAX_DIRFRAG_REP]; 242 }; 243 244 /* 245 * We cache inode xattrs as an encoded blob until they are first used, 246 * at which point we parse them into an rbtree. 247 */ 248 struct ceph_inode_xattr { 249 struct rb_node node; 250 251 const char *name; 252 int name_len; 253 const char *val; 254 int val_len; 255 int dirty; 256 257 int should_free_name; 258 int should_free_val; 259 }; 260 261 /* 262 * Ceph dentry state 263 */ 264 struct ceph_dentry_info { 265 struct dentry *dentry; 266 struct ceph_mds_session *lease_session; 267 struct list_head lease_list; 268 unsigned flags; 269 int lease_shared_gen; 270 u32 lease_gen; 271 u32 lease_seq; 272 unsigned long lease_renew_after, lease_renew_from; 273 unsigned long time; 274 u64 offset; 275 }; 276 277 #define CEPH_DENTRY_REFERENCED 1 278 #define CEPH_DENTRY_LEASE_LIST 2 279 #define CEPH_DENTRY_SHRINK_LIST 4 280 281 struct ceph_inode_xattrs_info { 282 /* 283 * (still encoded) xattr blob. we avoid the overhead of parsing 284 * this until someone actually calls getxattr, etc. 285 * 286 * blob->vec.iov_len == 4 implies there are no xattrs; blob == 287 * NULL means we don't know. 288 */ 289 struct ceph_buffer *blob, *prealloc_blob; 290 291 struct rb_root index; 292 bool dirty; 293 int count; 294 int names_size; 295 int vals_size; 296 u64 version, index_version; 297 }; 298 299 /* 300 * Ceph inode. 301 */ 302 struct ceph_inode_info { 303 struct ceph_vino i_vino; /* ceph ino + snap */ 304 305 spinlock_t i_ceph_lock; 306 307 u64 i_version; 308 u64 i_inline_version; 309 u32 i_time_warp_seq; 310 311 unsigned i_ceph_flags; 312 atomic64_t i_release_count; 313 atomic64_t i_ordered_count; 314 atomic64_t i_complete_seq[2]; 315 316 struct ceph_dir_layout i_dir_layout; 317 struct ceph_file_layout i_layout; 318 char *i_symlink; 319 320 /* for dirs */ 321 struct timespec64 i_rctime; 322 u64 i_rbytes, i_rfiles, i_rsubdirs; 323 u64 i_files, i_subdirs; 324 325 /* quotas */ 326 u64 i_max_bytes, i_max_files; 327 328 s32 i_dir_pin; 329 330 struct rb_root i_fragtree; 331 int i_fragtree_nsplits; 332 struct mutex i_fragtree_mutex; 333 334 struct ceph_inode_xattrs_info i_xattrs; 335 336 /* capabilities. protected _both_ by i_ceph_lock and cap->session's 337 * s_mutex. */ 338 struct rb_root i_caps; /* cap list */ 339 struct ceph_cap *i_auth_cap; /* authoritative cap, if any */ 340 unsigned i_dirty_caps, i_flushing_caps; /* mask of dirtied fields */ 341 struct list_head i_dirty_item, i_flushing_item; 342 /* we need to track cap writeback on a per-cap-bit basis, to allow 343 * overlapping, pipelined cap flushes to the mds. we can probably 344 * reduce the tid to 8 bits if we're concerned about inode size. */ 345 struct ceph_cap_flush *i_prealloc_cap_flush; 346 struct list_head i_cap_flush_list; 347 wait_queue_head_t i_cap_wq; /* threads waiting on a capability */ 348 unsigned long i_hold_caps_min; /* jiffies */ 349 unsigned long i_hold_caps_max; /* jiffies */ 350 struct list_head i_cap_delay_list; /* for delayed cap release to mds */ 351 struct ceph_cap_reservation i_cap_migration_resv; 352 struct list_head i_cap_snaps; /* snapped state pending flush to mds */ 353 struct ceph_snap_context *i_head_snapc; /* set if wr_buffer_head > 0 or 354 dirty|flushing caps */ 355 unsigned i_snap_caps; /* cap bits for snapped files */ 356 357 int i_nr_by_mode[CEPH_FILE_MODE_BITS]; /* open file counts */ 358 359 struct mutex i_truncate_mutex; 360 u32 i_truncate_seq; /* last truncate to smaller size */ 361 u64 i_truncate_size; /* and the size we last truncated down to */ 362 int i_truncate_pending; /* still need to call vmtruncate */ 363 364 u64 i_max_size; /* max file size authorized by mds */ 365 u64 i_reported_size; /* (max_)size reported to or requested of mds */ 366 u64 i_wanted_max_size; /* offset we'd like to write too */ 367 u64 i_requested_max_size; /* max_size we've requested */ 368 369 /* held references to caps */ 370 int i_pin_ref; 371 int i_rd_ref, i_rdcache_ref, i_wr_ref, i_wb_ref; 372 int i_wrbuffer_ref, i_wrbuffer_ref_head; 373 atomic_t i_filelock_ref; 374 atomic_t i_shared_gen; /* increment each time we get FILE_SHARED */ 375 u32 i_rdcache_gen; /* incremented each time we get FILE_CACHE. */ 376 u32 i_rdcache_revoking; /* RDCACHE gen to async invalidate, if any */ 377 378 struct list_head i_unsafe_dirops; /* uncommitted mds dir ops */ 379 struct list_head i_unsafe_iops; /* uncommitted mds inode ops */ 380 spinlock_t i_unsafe_lock; 381 382 union { 383 struct ceph_snap_realm *i_snap_realm; /* snap realm (if caps) */ 384 struct ceph_snapid_map *i_snapid_map; /* snapid -> dev_t */ 385 }; 386 int i_snap_realm_counter; /* snap realm (if caps) */ 387 struct list_head i_snap_realm_item; 388 struct list_head i_snap_flush_item; 389 390 struct work_struct i_wb_work; /* writeback work */ 391 struct work_struct i_pg_inv_work; /* page invalidation work */ 392 393 struct work_struct i_vmtruncate_work; 394 395 #ifdef CONFIG_CEPH_FSCACHE 396 struct fscache_cookie *fscache; 397 u32 i_fscache_gen; 398 #endif 399 struct inode vfs_inode; /* at end */ 400 }; 401 402 static inline struct ceph_inode_info *ceph_inode(struct inode *inode) 403 { 404 return container_of(inode, struct ceph_inode_info, vfs_inode); 405 } 406 407 static inline struct ceph_fs_client *ceph_inode_to_client(struct inode *inode) 408 { 409 return (struct ceph_fs_client *)inode->i_sb->s_fs_info; 410 } 411 412 static inline struct ceph_fs_client *ceph_sb_to_client(struct super_block *sb) 413 { 414 return (struct ceph_fs_client *)sb->s_fs_info; 415 } 416 417 static inline struct ceph_vino ceph_vino(struct inode *inode) 418 { 419 return ceph_inode(inode)->i_vino; 420 } 421 422 /* 423 * ino_t is <64 bits on many architectures, blech. 424 * 425 * i_ino (kernel inode) st_ino (userspace) 426 * i386 32 32 427 * x86_64+ino32 64 32 428 * x86_64 64 64 429 */ 430 static inline u32 ceph_ino_to_ino32(__u64 vino) 431 { 432 u32 ino = vino & 0xffffffff; 433 ino ^= vino >> 32; 434 if (!ino) 435 ino = 2; 436 return ino; 437 } 438 439 /* 440 * kernel i_ino value 441 */ 442 static inline ino_t ceph_vino_to_ino(struct ceph_vino vino) 443 { 444 #if BITS_PER_LONG == 32 445 return ceph_ino_to_ino32(vino.ino); 446 #else 447 return (ino_t)vino.ino; 448 #endif 449 } 450 451 /* 452 * user-visible ino (stat, filldir) 453 */ 454 #if BITS_PER_LONG == 32 455 static inline ino_t ceph_translate_ino(struct super_block *sb, ino_t ino) 456 { 457 return ino; 458 } 459 #else 460 static inline ino_t ceph_translate_ino(struct super_block *sb, ino_t ino) 461 { 462 if (ceph_test_mount_opt(ceph_sb_to_client(sb), INO32)) 463 ino = ceph_ino_to_ino32(ino); 464 return ino; 465 } 466 #endif 467 468 469 /* for printf-style formatting */ 470 #define ceph_vinop(i) ceph_inode(i)->i_vino.ino, ceph_inode(i)->i_vino.snap 471 472 static inline u64 ceph_ino(struct inode *inode) 473 { 474 return ceph_inode(inode)->i_vino.ino; 475 } 476 static inline u64 ceph_snap(struct inode *inode) 477 { 478 return ceph_inode(inode)->i_vino.snap; 479 } 480 481 static inline int ceph_ino_compare(struct inode *inode, void *data) 482 { 483 struct ceph_vino *pvino = (struct ceph_vino *)data; 484 struct ceph_inode_info *ci = ceph_inode(inode); 485 return ci->i_vino.ino == pvino->ino && 486 ci->i_vino.snap == pvino->snap; 487 } 488 489 static inline struct inode *ceph_find_inode(struct super_block *sb, 490 struct ceph_vino vino) 491 { 492 ino_t t = ceph_vino_to_ino(vino); 493 return ilookup5(sb, t, ceph_ino_compare, &vino); 494 } 495 496 497 /* 498 * Ceph inode. 499 */ 500 #define CEPH_I_DIR_ORDERED (1 << 0) /* dentries in dir are ordered */ 501 #define CEPH_I_NODELAY (1 << 1) /* do not delay cap release */ 502 #define CEPH_I_FLUSH (1 << 2) /* do not delay flush of dirty metadata */ 503 #define CEPH_I_NOFLUSH (1 << 3) /* do not flush dirty caps */ 504 #define CEPH_I_POOL_PERM (1 << 4) /* pool rd/wr bits are valid */ 505 #define CEPH_I_POOL_RD (1 << 5) /* can read from pool */ 506 #define CEPH_I_POOL_WR (1 << 6) /* can write to pool */ 507 #define CEPH_I_SEC_INITED (1 << 7) /* security initialized */ 508 #define CEPH_I_CAP_DROPPED (1 << 8) /* caps were forcibly dropped */ 509 #define CEPH_I_KICK_FLUSH (1 << 9) /* kick flushing caps */ 510 #define CEPH_I_FLUSH_SNAPS (1 << 10) /* need flush snapss */ 511 #define CEPH_I_ERROR_WRITE (1 << 11) /* have seen write errors */ 512 #define CEPH_I_ERROR_FILELOCK (1 << 12) /* have seen file lock errors */ 513 514 515 /* 516 * We set the ERROR_WRITE bit when we start seeing write errors on an inode 517 * and then clear it when they start succeeding. Note that we do a lockless 518 * check first, and only take the lock if it looks like it needs to be changed. 519 * The write submission code just takes this as a hint, so we're not too 520 * worried if a few slip through in either direction. 521 */ 522 static inline void ceph_set_error_write(struct ceph_inode_info *ci) 523 { 524 if (!(READ_ONCE(ci->i_ceph_flags) & CEPH_I_ERROR_WRITE)) { 525 spin_lock(&ci->i_ceph_lock); 526 ci->i_ceph_flags |= CEPH_I_ERROR_WRITE; 527 spin_unlock(&ci->i_ceph_lock); 528 } 529 } 530 531 static inline void ceph_clear_error_write(struct ceph_inode_info *ci) 532 { 533 if (READ_ONCE(ci->i_ceph_flags) & CEPH_I_ERROR_WRITE) { 534 spin_lock(&ci->i_ceph_lock); 535 ci->i_ceph_flags &= ~CEPH_I_ERROR_WRITE; 536 spin_unlock(&ci->i_ceph_lock); 537 } 538 } 539 540 static inline void __ceph_dir_set_complete(struct ceph_inode_info *ci, 541 long long release_count, 542 long long ordered_count) 543 { 544 smp_mb__before_atomic(); 545 atomic64_set(&ci->i_complete_seq[0], release_count); 546 atomic64_set(&ci->i_complete_seq[1], ordered_count); 547 } 548 549 static inline void __ceph_dir_clear_complete(struct ceph_inode_info *ci) 550 { 551 atomic64_inc(&ci->i_release_count); 552 } 553 554 static inline void __ceph_dir_clear_ordered(struct ceph_inode_info *ci) 555 { 556 atomic64_inc(&ci->i_ordered_count); 557 } 558 559 static inline bool __ceph_dir_is_complete(struct ceph_inode_info *ci) 560 { 561 return atomic64_read(&ci->i_complete_seq[0]) == 562 atomic64_read(&ci->i_release_count); 563 } 564 565 static inline bool __ceph_dir_is_complete_ordered(struct ceph_inode_info *ci) 566 { 567 return atomic64_read(&ci->i_complete_seq[0]) == 568 atomic64_read(&ci->i_release_count) && 569 atomic64_read(&ci->i_complete_seq[1]) == 570 atomic64_read(&ci->i_ordered_count); 571 } 572 573 static inline void ceph_dir_clear_complete(struct inode *inode) 574 { 575 __ceph_dir_clear_complete(ceph_inode(inode)); 576 } 577 578 static inline void ceph_dir_clear_ordered(struct inode *inode) 579 { 580 __ceph_dir_clear_ordered(ceph_inode(inode)); 581 } 582 583 static inline bool ceph_dir_is_complete_ordered(struct inode *inode) 584 { 585 bool ret = __ceph_dir_is_complete_ordered(ceph_inode(inode)); 586 smp_rmb(); 587 return ret; 588 } 589 590 /* find a specific frag @f */ 591 extern struct ceph_inode_frag *__ceph_find_frag(struct ceph_inode_info *ci, 592 u32 f); 593 594 /* 595 * choose fragment for value @v. copy frag content to pfrag, if leaf 596 * exists 597 */ 598 extern u32 ceph_choose_frag(struct ceph_inode_info *ci, u32 v, 599 struct ceph_inode_frag *pfrag, 600 int *found); 601 602 static inline struct ceph_dentry_info *ceph_dentry(const struct dentry *dentry) 603 { 604 return (struct ceph_dentry_info *)dentry->d_fsdata; 605 } 606 607 /* 608 * caps helpers 609 */ 610 static inline bool __ceph_is_any_real_caps(struct ceph_inode_info *ci) 611 { 612 return !RB_EMPTY_ROOT(&ci->i_caps); 613 } 614 615 extern int __ceph_caps_issued(struct ceph_inode_info *ci, int *implemented); 616 extern int __ceph_caps_issued_mask(struct ceph_inode_info *ci, int mask, int t); 617 extern int __ceph_caps_issued_other(struct ceph_inode_info *ci, 618 struct ceph_cap *cap); 619 620 static inline int ceph_caps_issued(struct ceph_inode_info *ci) 621 { 622 int issued; 623 spin_lock(&ci->i_ceph_lock); 624 issued = __ceph_caps_issued(ci, NULL); 625 spin_unlock(&ci->i_ceph_lock); 626 return issued; 627 } 628 629 static inline int ceph_caps_issued_mask(struct ceph_inode_info *ci, int mask, 630 int touch) 631 { 632 int r; 633 spin_lock(&ci->i_ceph_lock); 634 r = __ceph_caps_issued_mask(ci, mask, touch); 635 spin_unlock(&ci->i_ceph_lock); 636 return r; 637 } 638 639 static inline int __ceph_caps_dirty(struct ceph_inode_info *ci) 640 { 641 return ci->i_dirty_caps | ci->i_flushing_caps; 642 } 643 extern struct ceph_cap_flush *ceph_alloc_cap_flush(void); 644 extern void ceph_free_cap_flush(struct ceph_cap_flush *cf); 645 extern int __ceph_mark_dirty_caps(struct ceph_inode_info *ci, int mask, 646 struct ceph_cap_flush **pcf); 647 648 extern int __ceph_caps_revoking_other(struct ceph_inode_info *ci, 649 struct ceph_cap *ocap, int mask); 650 extern int ceph_caps_revoking(struct ceph_inode_info *ci, int mask); 651 extern int __ceph_caps_used(struct ceph_inode_info *ci); 652 653 extern int __ceph_caps_file_wanted(struct ceph_inode_info *ci); 654 655 /* 656 * wanted, by virtue of open file modes AND cap refs (buffered/cached data) 657 */ 658 static inline int __ceph_caps_wanted(struct ceph_inode_info *ci) 659 { 660 int w = __ceph_caps_file_wanted(ci) | __ceph_caps_used(ci); 661 if (w & CEPH_CAP_FILE_BUFFER) 662 w |= CEPH_CAP_FILE_EXCL; /* we want EXCL if dirty data */ 663 return w; 664 } 665 666 /* what the mds thinks we want */ 667 extern int __ceph_caps_mds_wanted(struct ceph_inode_info *ci, bool check); 668 669 extern void ceph_caps_init(struct ceph_mds_client *mdsc); 670 extern void ceph_caps_finalize(struct ceph_mds_client *mdsc); 671 extern void ceph_adjust_caps_max_min(struct ceph_mds_client *mdsc, 672 struct ceph_mount_options *fsopt); 673 extern int ceph_reserve_caps(struct ceph_mds_client *mdsc, 674 struct ceph_cap_reservation *ctx, int need); 675 extern void ceph_unreserve_caps(struct ceph_mds_client *mdsc, 676 struct ceph_cap_reservation *ctx); 677 extern void ceph_reservation_status(struct ceph_fs_client *client, 678 int *total, int *avail, int *used, 679 int *reserved, int *min); 680 681 682 683 /* 684 * we keep buffered readdir results attached to file->private_data 685 */ 686 #define CEPH_F_SYNC 1 687 #define CEPH_F_ATEND 2 688 689 struct ceph_file_info { 690 short fmode; /* initialized on open */ 691 short flags; /* CEPH_F_* */ 692 693 spinlock_t rw_contexts_lock; 694 struct list_head rw_contexts; 695 }; 696 697 struct ceph_dir_file_info { 698 struct ceph_file_info file_info; 699 700 /* readdir: position within the dir */ 701 u32 frag; 702 struct ceph_mds_request *last_readdir; 703 704 /* readdir: position within a frag */ 705 unsigned next_offset; /* offset of next chunk (last_name's + 1) */ 706 char *last_name; /* last entry in previous chunk */ 707 long long dir_release_count; 708 long long dir_ordered_count; 709 int readdir_cache_idx; 710 711 /* used for -o dirstat read() on directory thing */ 712 char *dir_info; 713 int dir_info_len; 714 }; 715 716 struct ceph_rw_context { 717 struct list_head list; 718 struct task_struct *thread; 719 int caps; 720 }; 721 722 #define CEPH_DEFINE_RW_CONTEXT(_name, _caps) \ 723 struct ceph_rw_context _name = { \ 724 .thread = current, \ 725 .caps = _caps, \ 726 } 727 728 static inline void ceph_add_rw_context(struct ceph_file_info *cf, 729 struct ceph_rw_context *ctx) 730 { 731 spin_lock(&cf->rw_contexts_lock); 732 list_add(&ctx->list, &cf->rw_contexts); 733 spin_unlock(&cf->rw_contexts_lock); 734 } 735 736 static inline void ceph_del_rw_context(struct ceph_file_info *cf, 737 struct ceph_rw_context *ctx) 738 { 739 spin_lock(&cf->rw_contexts_lock); 740 list_del(&ctx->list); 741 spin_unlock(&cf->rw_contexts_lock); 742 } 743 744 static inline struct ceph_rw_context* 745 ceph_find_rw_context(struct ceph_file_info *cf) 746 { 747 struct ceph_rw_context *ctx, *found = NULL; 748 spin_lock(&cf->rw_contexts_lock); 749 list_for_each_entry(ctx, &cf->rw_contexts, list) { 750 if (ctx->thread == current) { 751 found = ctx; 752 break; 753 } 754 } 755 spin_unlock(&cf->rw_contexts_lock); 756 return found; 757 } 758 759 struct ceph_readdir_cache_control { 760 struct page *page; 761 struct dentry **dentries; 762 int index; 763 }; 764 765 /* 766 * A "snap realm" describes a subset of the file hierarchy sharing 767 * the same set of snapshots that apply to it. The realms themselves 768 * are organized into a hierarchy, such that children inherit (some of) 769 * the snapshots of their parents. 770 * 771 * All inodes within the realm that have capabilities are linked into a 772 * per-realm list. 773 */ 774 struct ceph_snap_realm { 775 u64 ino; 776 struct inode *inode; 777 atomic_t nref; 778 struct rb_node node; 779 780 u64 created, seq; 781 u64 parent_ino; 782 u64 parent_since; /* snapid when our current parent became so */ 783 784 u64 *prior_parent_snaps; /* snaps inherited from any parents we */ 785 u32 num_prior_parent_snaps; /* had prior to parent_since */ 786 u64 *snaps; /* snaps specific to this realm */ 787 u32 num_snaps; 788 789 struct ceph_snap_realm *parent; 790 struct list_head children; /* list of child realms */ 791 struct list_head child_item; 792 793 struct list_head empty_item; /* if i have ref==0 */ 794 795 struct list_head dirty_item; /* if realm needs new context */ 796 797 /* the current set of snaps for this realm */ 798 struct ceph_snap_context *cached_context; 799 800 struct list_head inodes_with_caps; 801 spinlock_t inodes_with_caps_lock; 802 }; 803 804 static inline int default_congestion_kb(void) 805 { 806 int congestion_kb; 807 808 /* 809 * Copied from NFS 810 * 811 * congestion size, scale with available memory. 812 * 813 * 64MB: 8192k 814 * 128MB: 11585k 815 * 256MB: 16384k 816 * 512MB: 23170k 817 * 1GB: 32768k 818 * 2GB: 46340k 819 * 4GB: 65536k 820 * 8GB: 92681k 821 * 16GB: 131072k 822 * 823 * This allows larger machines to have larger/more transfers. 824 * Limit the default to 256M 825 */ 826 congestion_kb = (16*int_sqrt(totalram_pages())) << (PAGE_SHIFT-10); 827 if (congestion_kb > 256*1024) 828 congestion_kb = 256*1024; 829 830 return congestion_kb; 831 } 832 833 834 835 /* snap.c */ 836 struct ceph_snap_realm *ceph_lookup_snap_realm(struct ceph_mds_client *mdsc, 837 u64 ino); 838 extern void ceph_get_snap_realm(struct ceph_mds_client *mdsc, 839 struct ceph_snap_realm *realm); 840 extern void ceph_put_snap_realm(struct ceph_mds_client *mdsc, 841 struct ceph_snap_realm *realm); 842 extern int ceph_update_snap_trace(struct ceph_mds_client *m, 843 void *p, void *e, bool deletion, 844 struct ceph_snap_realm **realm_ret); 845 extern void ceph_handle_snap(struct ceph_mds_client *mdsc, 846 struct ceph_mds_session *session, 847 struct ceph_msg *msg); 848 extern void ceph_queue_cap_snap(struct ceph_inode_info *ci); 849 extern int __ceph_finish_cap_snap(struct ceph_inode_info *ci, 850 struct ceph_cap_snap *capsnap); 851 extern void ceph_cleanup_empty_realms(struct ceph_mds_client *mdsc); 852 853 extern struct ceph_snapid_map *ceph_get_snapid_map(struct ceph_mds_client *mdsc, 854 u64 snap); 855 extern void ceph_put_snapid_map(struct ceph_mds_client* mdsc, 856 struct ceph_snapid_map *sm); 857 extern void ceph_trim_snapid_map(struct ceph_mds_client *mdsc); 858 extern void ceph_cleanup_snapid_map(struct ceph_mds_client *mdsc); 859 860 861 /* 862 * a cap_snap is "pending" if it is still awaiting an in-progress 863 * sync write (that may/may not still update size, mtime, etc.). 864 */ 865 static inline bool __ceph_have_pending_cap_snap(struct ceph_inode_info *ci) 866 { 867 return !list_empty(&ci->i_cap_snaps) && 868 list_last_entry(&ci->i_cap_snaps, struct ceph_cap_snap, 869 ci_item)->writing; 870 } 871 872 /* inode.c */ 873 extern const struct inode_operations ceph_file_iops; 874 875 extern struct inode *ceph_alloc_inode(struct super_block *sb); 876 extern void ceph_destroy_inode(struct inode *inode); 877 extern int ceph_drop_inode(struct inode *inode); 878 879 extern struct inode *ceph_get_inode(struct super_block *sb, 880 struct ceph_vino vino); 881 extern struct inode *ceph_get_snapdir(struct inode *parent); 882 extern int ceph_fill_file_size(struct inode *inode, int issued, 883 u32 truncate_seq, u64 truncate_size, u64 size); 884 extern void ceph_fill_file_time(struct inode *inode, int issued, 885 u64 time_warp_seq, struct timespec64 *ctime, 886 struct timespec64 *mtime, 887 struct timespec64 *atime); 888 extern int ceph_fill_trace(struct super_block *sb, 889 struct ceph_mds_request *req); 890 extern int ceph_readdir_prepopulate(struct ceph_mds_request *req, 891 struct ceph_mds_session *session); 892 893 extern int ceph_inode_holds_cap(struct inode *inode, int mask); 894 895 extern bool ceph_inode_set_size(struct inode *inode, loff_t size); 896 extern void __ceph_do_pending_vmtruncate(struct inode *inode); 897 extern void ceph_queue_vmtruncate(struct inode *inode); 898 899 extern void ceph_queue_invalidate(struct inode *inode); 900 extern void ceph_queue_writeback(struct inode *inode); 901 902 extern int __ceph_do_getattr(struct inode *inode, struct page *locked_page, 903 int mask, bool force); 904 static inline int ceph_do_getattr(struct inode *inode, int mask, bool force) 905 { 906 return __ceph_do_getattr(inode, NULL, mask, force); 907 } 908 extern int ceph_permission(struct inode *inode, int mask); 909 extern int __ceph_setattr(struct inode *inode, struct iattr *attr); 910 extern int ceph_setattr(struct dentry *dentry, struct iattr *attr); 911 extern int ceph_getattr(const struct path *path, struct kstat *stat, 912 u32 request_mask, unsigned int flags); 913 914 /* xattr.c */ 915 int __ceph_setxattr(struct inode *, const char *, const void *, size_t, int); 916 ssize_t __ceph_getxattr(struct inode *, const char *, void *, size_t); 917 extern ssize_t ceph_listxattr(struct dentry *, char *, size_t); 918 extern void __ceph_build_xattrs_blob(struct ceph_inode_info *ci); 919 extern void __ceph_destroy_xattrs(struct ceph_inode_info *ci); 920 extern void __init ceph_xattr_init(void); 921 extern void ceph_xattr_exit(void); 922 extern const struct xattr_handler *ceph_xattr_handlers[]; 923 924 #ifdef CONFIG_SECURITY 925 extern bool ceph_security_xattr_deadlock(struct inode *in); 926 extern bool ceph_security_xattr_wanted(struct inode *in); 927 #else 928 static inline bool ceph_security_xattr_deadlock(struct inode *in) 929 { 930 return false; 931 } 932 static inline bool ceph_security_xattr_wanted(struct inode *in) 933 { 934 return false; 935 } 936 #endif 937 938 /* acl.c */ 939 struct ceph_acls_info { 940 void *default_acl; 941 void *acl; 942 struct ceph_pagelist *pagelist; 943 }; 944 945 #ifdef CONFIG_CEPH_FS_POSIX_ACL 946 947 struct posix_acl *ceph_get_acl(struct inode *, int); 948 int ceph_set_acl(struct inode *inode, struct posix_acl *acl, int type); 949 int ceph_pre_init_acls(struct inode *dir, umode_t *mode, 950 struct ceph_acls_info *info); 951 void ceph_init_inode_acls(struct inode *inode, struct ceph_acls_info *info); 952 void ceph_release_acls_info(struct ceph_acls_info *info); 953 954 static inline void ceph_forget_all_cached_acls(struct inode *inode) 955 { 956 forget_all_cached_acls(inode); 957 } 958 959 #else 960 961 #define ceph_get_acl NULL 962 #define ceph_set_acl NULL 963 964 static inline int ceph_pre_init_acls(struct inode *dir, umode_t *mode, 965 struct ceph_acls_info *info) 966 { 967 return 0; 968 } 969 static inline void ceph_init_inode_acls(struct inode *inode, 970 struct ceph_acls_info *info) 971 { 972 } 973 static inline void ceph_release_acls_info(struct ceph_acls_info *info) 974 { 975 } 976 static inline int ceph_acl_chmod(struct dentry *dentry, struct inode *inode) 977 { 978 return 0; 979 } 980 981 static inline void ceph_forget_all_cached_acls(struct inode *inode) 982 { 983 } 984 985 #endif 986 987 /* caps.c */ 988 extern const char *ceph_cap_string(int c); 989 extern void ceph_handle_caps(struct ceph_mds_session *session, 990 struct ceph_msg *msg); 991 extern struct ceph_cap *ceph_get_cap(struct ceph_mds_client *mdsc, 992 struct ceph_cap_reservation *ctx); 993 extern void ceph_add_cap(struct inode *inode, 994 struct ceph_mds_session *session, u64 cap_id, 995 int fmode, unsigned issued, unsigned wanted, 996 unsigned cap, unsigned seq, u64 realmino, int flags, 997 struct ceph_cap **new_cap); 998 extern void __ceph_remove_cap(struct ceph_cap *cap, bool queue_release); 999 extern void __ceph_remove_caps(struct inode* inode); 1000 extern void ceph_put_cap(struct ceph_mds_client *mdsc, 1001 struct ceph_cap *cap); 1002 extern int ceph_is_any_caps(struct inode *inode); 1003 1004 extern int ceph_write_inode(struct inode *inode, struct writeback_control *wbc); 1005 extern int ceph_fsync(struct file *file, loff_t start, loff_t end, 1006 int datasync); 1007 extern void ceph_early_kick_flushing_caps(struct ceph_mds_client *mdsc, 1008 struct ceph_mds_session *session); 1009 extern void ceph_kick_flushing_caps(struct ceph_mds_client *mdsc, 1010 struct ceph_mds_session *session); 1011 extern struct ceph_cap *ceph_get_cap_for_mds(struct ceph_inode_info *ci, 1012 int mds); 1013 extern int ceph_get_cap_mds(struct inode *inode); 1014 extern void ceph_get_cap_refs(struct ceph_inode_info *ci, int caps); 1015 extern void ceph_put_cap_refs(struct ceph_inode_info *ci, int had); 1016 extern void ceph_put_wrbuffer_cap_refs(struct ceph_inode_info *ci, int nr, 1017 struct ceph_snap_context *snapc); 1018 extern void ceph_flush_snaps(struct ceph_inode_info *ci, 1019 struct ceph_mds_session **psession); 1020 extern bool __ceph_should_report_size(struct ceph_inode_info *ci); 1021 extern void ceph_check_caps(struct ceph_inode_info *ci, int flags, 1022 struct ceph_mds_session *session); 1023 extern void ceph_check_delayed_caps(struct ceph_mds_client *mdsc); 1024 extern void ceph_flush_dirty_caps(struct ceph_mds_client *mdsc); 1025 extern int ceph_drop_caps_for_unlink(struct inode *inode); 1026 extern int ceph_encode_inode_release(void **p, struct inode *inode, 1027 int mds, int drop, int unless, int force); 1028 extern int ceph_encode_dentry_release(void **p, struct dentry *dn, 1029 struct inode *dir, 1030 int mds, int drop, int unless); 1031 1032 extern int ceph_get_caps(struct ceph_inode_info *ci, int need, int want, 1033 loff_t endoff, int *got, struct page **pinned_page); 1034 extern int ceph_try_get_caps(struct ceph_inode_info *ci, 1035 int need, int want, bool nonblock, int *got); 1036 1037 /* for counting open files by mode */ 1038 extern void __ceph_get_fmode(struct ceph_inode_info *ci, int mode); 1039 extern void ceph_put_fmode(struct ceph_inode_info *ci, int mode); 1040 1041 /* addr.c */ 1042 extern const struct address_space_operations ceph_aops; 1043 extern int ceph_mmap(struct file *file, struct vm_area_struct *vma); 1044 extern int ceph_uninline_data(struct file *filp, struct page *locked_page); 1045 extern int ceph_pool_perm_check(struct ceph_inode_info *ci, int need); 1046 extern void ceph_pool_perm_destroy(struct ceph_mds_client* mdsc); 1047 1048 /* file.c */ 1049 extern const struct file_operations ceph_file_fops; 1050 1051 extern int ceph_renew_caps(struct inode *inode); 1052 extern int ceph_open(struct inode *inode, struct file *file); 1053 extern int ceph_atomic_open(struct inode *dir, struct dentry *dentry, 1054 struct file *file, unsigned flags, umode_t mode); 1055 extern int ceph_release(struct inode *inode, struct file *filp); 1056 extern void ceph_fill_inline_data(struct inode *inode, struct page *locked_page, 1057 char *data, size_t len); 1058 1059 /* dir.c */ 1060 extern const struct file_operations ceph_dir_fops; 1061 extern const struct file_operations ceph_snapdir_fops; 1062 extern const struct inode_operations ceph_dir_iops; 1063 extern const struct inode_operations ceph_snapdir_iops; 1064 extern const struct dentry_operations ceph_dentry_ops; 1065 1066 extern loff_t ceph_make_fpos(unsigned high, unsigned off, bool hash_order); 1067 extern int ceph_handle_notrace_create(struct inode *dir, struct dentry *dentry); 1068 extern int ceph_handle_snapdir(struct ceph_mds_request *req, 1069 struct dentry *dentry, int err); 1070 extern struct dentry *ceph_finish_lookup(struct ceph_mds_request *req, 1071 struct dentry *dentry, int err); 1072 1073 extern void __ceph_dentry_lease_touch(struct ceph_dentry_info *di); 1074 extern void __ceph_dentry_dir_lease_touch(struct ceph_dentry_info *di); 1075 extern void ceph_invalidate_dentry_lease(struct dentry *dentry); 1076 extern int ceph_trim_dentries(struct ceph_mds_client *mdsc); 1077 extern unsigned ceph_dentry_hash(struct inode *dir, struct dentry *dn); 1078 extern void ceph_readdir_cache_release(struct ceph_readdir_cache_control *ctl); 1079 1080 /* ioctl.c */ 1081 extern long ceph_ioctl(struct file *file, unsigned int cmd, unsigned long arg); 1082 1083 /* export.c */ 1084 extern const struct export_operations ceph_export_ops; 1085 1086 /* locks.c */ 1087 extern __init void ceph_flock_init(void); 1088 extern int ceph_lock(struct file *file, int cmd, struct file_lock *fl); 1089 extern int ceph_flock(struct file *file, int cmd, struct file_lock *fl); 1090 extern void ceph_count_locks(struct inode *inode, int *p_num, int *f_num); 1091 extern int ceph_encode_locks_to_buffer(struct inode *inode, 1092 struct ceph_filelock *flocks, 1093 int num_fcntl_locks, 1094 int num_flock_locks); 1095 extern int ceph_locks_to_pagelist(struct ceph_filelock *flocks, 1096 struct ceph_pagelist *pagelist, 1097 int num_fcntl_locks, int num_flock_locks); 1098 1099 /* debugfs.c */ 1100 extern int ceph_fs_debugfs_init(struct ceph_fs_client *client); 1101 extern void ceph_fs_debugfs_cleanup(struct ceph_fs_client *client); 1102 1103 /* quota.c */ 1104 static inline bool __ceph_has_any_quota(struct ceph_inode_info *ci) 1105 { 1106 return ci->i_max_files || ci->i_max_bytes; 1107 } 1108 1109 extern void ceph_adjust_quota_realms_count(struct inode *inode, bool inc); 1110 1111 static inline void __ceph_update_quota(struct ceph_inode_info *ci, 1112 u64 max_bytes, u64 max_files) 1113 { 1114 bool had_quota, has_quota; 1115 had_quota = __ceph_has_any_quota(ci); 1116 ci->i_max_bytes = max_bytes; 1117 ci->i_max_files = max_files; 1118 has_quota = __ceph_has_any_quota(ci); 1119 1120 if (had_quota != has_quota) 1121 ceph_adjust_quota_realms_count(&ci->vfs_inode, has_quota); 1122 } 1123 1124 extern void ceph_handle_quota(struct ceph_mds_client *mdsc, 1125 struct ceph_mds_session *session, 1126 struct ceph_msg *msg); 1127 extern bool ceph_quota_is_max_files_exceeded(struct inode *inode); 1128 extern bool ceph_quota_is_same_realm(struct inode *old, struct inode *new); 1129 extern bool ceph_quota_is_max_bytes_exceeded(struct inode *inode, 1130 loff_t newlen); 1131 extern bool ceph_quota_is_max_bytes_approaching(struct inode *inode, 1132 loff_t newlen); 1133 extern bool ceph_quota_update_statfs(struct ceph_fs_client *fsc, 1134 struct kstatfs *buf); 1135 1136 #endif /* _FS_CEPH_SUPER_H */ 1137