1 #ifndef _FS_CEPH_SUPER_H 2 #define _FS_CEPH_SUPER_H 3 4 #include <linux/ceph/ceph_debug.h> 5 6 #include <asm/unaligned.h> 7 #include <linux/backing-dev.h> 8 #include <linux/completion.h> 9 #include <linux/exportfs.h> 10 #include <linux/fs.h> 11 #include <linux/mempool.h> 12 #include <linux/pagemap.h> 13 #include <linux/wait.h> 14 #include <linux/writeback.h> 15 #include <linux/slab.h> 16 #include <linux/posix_acl.h> 17 18 #include <linux/ceph/libceph.h> 19 20 #ifdef CONFIG_CEPH_FSCACHE 21 #include <linux/fscache.h> 22 #endif 23 24 /* f_type in struct statfs */ 25 #define CEPH_SUPER_MAGIC 0x00c36400 26 27 /* large granularity for statfs utilization stats to facilitate 28 * large volume sizes on 32-bit machines. */ 29 #define CEPH_BLOCK_SHIFT 22 /* 4 MB */ 30 #define CEPH_BLOCK (1 << CEPH_BLOCK_SHIFT) 31 32 #define CEPH_MOUNT_OPT_DIRSTAT (1<<4) /* `cat dirname` for stats */ 33 #define CEPH_MOUNT_OPT_RBYTES (1<<5) /* dir st_bytes = rbytes */ 34 #define CEPH_MOUNT_OPT_NOASYNCREADDIR (1<<7) /* no dcache readdir */ 35 #define CEPH_MOUNT_OPT_INO32 (1<<8) /* 32 bit inos */ 36 #define CEPH_MOUNT_OPT_DCACHE (1<<9) /* use dcache for readdir etc */ 37 #define CEPH_MOUNT_OPT_FSCACHE (1<<10) /* use fscache */ 38 #define CEPH_MOUNT_OPT_NOPOOLPERM (1<<11) /* no pool permission check */ 39 40 #define CEPH_MOUNT_OPT_DEFAULT (CEPH_MOUNT_OPT_RBYTES | \ 41 CEPH_MOUNT_OPT_DCACHE) 42 43 #define ceph_set_mount_opt(fsc, opt) \ 44 (fsc)->mount_options->flags |= CEPH_MOUNT_OPT_##opt; 45 #define ceph_test_mount_opt(fsc, opt) \ 46 (!!((fsc)->mount_options->flags & CEPH_MOUNT_OPT_##opt)) 47 48 #define CEPH_RSIZE_DEFAULT 0 /* max read size */ 49 #define CEPH_RASIZE_DEFAULT (8192*1024) /* readahead */ 50 #define CEPH_MAX_READDIR_DEFAULT 1024 51 #define CEPH_MAX_READDIR_BYTES_DEFAULT (512*1024) 52 #define CEPH_SNAPDIRNAME_DEFAULT ".snap" 53 54 struct ceph_mount_options { 55 int flags; 56 int sb_flags; 57 58 int wsize; /* max write size */ 59 int rsize; /* max read size */ 60 int rasize; /* max readahead */ 61 int congestion_kb; /* max writeback in flight */ 62 int caps_wanted_delay_min, caps_wanted_delay_max; 63 int cap_release_safety; 64 int max_readdir; /* max readdir result (entires) */ 65 int max_readdir_bytes; /* max readdir result (bytes) */ 66 67 /* 68 * everything above this point can be memcmp'd; everything below 69 * is handled in compare_mount_options() 70 */ 71 72 char *snapdir_name; /* default ".snap" */ 73 }; 74 75 struct ceph_fs_client { 76 struct super_block *sb; 77 78 struct ceph_mount_options *mount_options; 79 struct ceph_client *client; 80 81 unsigned long mount_state; 82 int min_caps; /* min caps i added */ 83 84 struct ceph_mds_client *mdsc; 85 86 /* writeback */ 87 mempool_t *wb_pagevec_pool; 88 struct workqueue_struct *wb_wq; 89 struct workqueue_struct *pg_inv_wq; 90 struct workqueue_struct *trunc_wq; 91 atomic_long_t writeback_count; 92 93 struct backing_dev_info backing_dev_info; 94 95 #ifdef CONFIG_DEBUG_FS 96 struct dentry *debugfs_dentry_lru, *debugfs_caps; 97 struct dentry *debugfs_congestion_kb; 98 struct dentry *debugfs_bdi; 99 struct dentry *debugfs_mdsc, *debugfs_mdsmap; 100 struct dentry *debugfs_mds_sessions; 101 #endif 102 103 #ifdef CONFIG_CEPH_FSCACHE 104 struct fscache_cookie *fscache; 105 struct workqueue_struct *revalidate_wq; 106 #endif 107 }; 108 109 110 /* 111 * File i/o capability. This tracks shared state with the metadata 112 * server that allows us to cache or writeback attributes or to read 113 * and write data. For any given inode, we should have one or more 114 * capabilities, one issued by each metadata server, and our 115 * cumulative access is the OR of all issued capabilities. 116 * 117 * Each cap is referenced by the inode's i_caps rbtree and by per-mds 118 * session capability lists. 119 */ 120 struct ceph_cap { 121 struct ceph_inode_info *ci; 122 struct rb_node ci_node; /* per-ci cap tree */ 123 struct ceph_mds_session *session; 124 struct list_head session_caps; /* per-session caplist */ 125 u64 cap_id; /* unique cap id (mds provided) */ 126 union { 127 /* in-use caps */ 128 struct { 129 int issued; /* latest, from the mds */ 130 int implemented; /* implemented superset of 131 issued (for revocation) */ 132 int mds, mds_wanted; 133 }; 134 /* caps to release */ 135 struct { 136 u64 cap_ino; 137 int queue_release; 138 }; 139 }; 140 u32 seq, issue_seq, mseq; 141 u32 cap_gen; /* active/stale cycle */ 142 unsigned long last_used; 143 struct list_head caps_item; 144 }; 145 146 #define CHECK_CAPS_NODELAY 1 /* do not delay any further */ 147 #define CHECK_CAPS_AUTHONLY 2 /* only check auth cap */ 148 #define CHECK_CAPS_FLUSH 4 /* flush any dirty caps */ 149 150 /* 151 * Snapped cap state that is pending flush to mds. When a snapshot occurs, 152 * we first complete any in-process sync writes and writeback any dirty 153 * data before flushing the snapped state (tracked here) back to the MDS. 154 */ 155 struct ceph_cap_snap { 156 atomic_t nref; 157 struct ceph_inode_info *ci; 158 struct list_head ci_item, flushing_item; 159 160 u64 follows, flush_tid; 161 int issued, dirty; 162 struct ceph_snap_context *context; 163 164 umode_t mode; 165 kuid_t uid; 166 kgid_t gid; 167 168 struct ceph_buffer *xattr_blob; 169 u64 xattr_version; 170 171 u64 size; 172 struct timespec mtime, atime, ctime; 173 u64 time_warp_seq; 174 int writing; /* a sync write is still in progress */ 175 int dirty_pages; /* dirty pages awaiting writeback */ 176 bool inline_data; 177 bool need_flush; 178 }; 179 180 static inline void ceph_put_cap_snap(struct ceph_cap_snap *capsnap) 181 { 182 if (atomic_dec_and_test(&capsnap->nref)) { 183 if (capsnap->xattr_blob) 184 ceph_buffer_put(capsnap->xattr_blob); 185 kfree(capsnap); 186 } 187 } 188 189 struct ceph_cap_flush { 190 u64 tid; 191 int caps; 192 struct rb_node g_node; // global 193 union { 194 struct rb_node i_node; // inode 195 struct list_head list; 196 }; 197 }; 198 199 /* 200 * The frag tree describes how a directory is fragmented, potentially across 201 * multiple metadata servers. It is also used to indicate points where 202 * metadata authority is delegated, and whether/where metadata is replicated. 203 * 204 * A _leaf_ frag will be present in the i_fragtree IFF there is 205 * delegation info. That is, if mds >= 0 || ndist > 0. 206 */ 207 #define CEPH_MAX_DIRFRAG_REP 4 208 209 struct ceph_inode_frag { 210 struct rb_node node; 211 212 /* fragtree state */ 213 u32 frag; 214 int split_by; /* i.e. 2^(split_by) children */ 215 216 /* delegation and replication info */ 217 int mds; /* -1 if same authority as parent */ 218 int ndist; /* >0 if replicated */ 219 int dist[CEPH_MAX_DIRFRAG_REP]; 220 }; 221 222 /* 223 * We cache inode xattrs as an encoded blob until they are first used, 224 * at which point we parse them into an rbtree. 225 */ 226 struct ceph_inode_xattr { 227 struct rb_node node; 228 229 const char *name; 230 int name_len; 231 const char *val; 232 int val_len; 233 int dirty; 234 235 int should_free_name; 236 int should_free_val; 237 }; 238 239 /* 240 * Ceph dentry state 241 */ 242 struct ceph_dentry_info { 243 struct ceph_mds_session *lease_session; 244 u32 lease_gen, lease_shared_gen; 245 u32 lease_seq; 246 unsigned long lease_renew_after, lease_renew_from; 247 struct list_head lru; 248 struct dentry *dentry; 249 u64 time; 250 u64 offset; 251 }; 252 253 struct ceph_inode_xattrs_info { 254 /* 255 * (still encoded) xattr blob. we avoid the overhead of parsing 256 * this until someone actually calls getxattr, etc. 257 * 258 * blob->vec.iov_len == 4 implies there are no xattrs; blob == 259 * NULL means we don't know. 260 */ 261 struct ceph_buffer *blob, *prealloc_blob; 262 263 struct rb_root index; 264 bool dirty; 265 int count; 266 int names_size; 267 int vals_size; 268 u64 version, index_version; 269 }; 270 271 /* 272 * Ceph inode. 273 */ 274 struct ceph_inode_info { 275 struct ceph_vino i_vino; /* ceph ino + snap */ 276 277 spinlock_t i_ceph_lock; 278 279 u64 i_version; 280 u64 i_inline_version; 281 u32 i_time_warp_seq; 282 283 unsigned i_ceph_flags; 284 atomic64_t i_release_count; 285 atomic64_t i_ordered_count; 286 atomic64_t i_complete_seq[2]; 287 288 struct ceph_dir_layout i_dir_layout; 289 struct ceph_file_layout i_layout; 290 size_t i_pool_ns_len; 291 char *i_symlink; 292 293 /* for dirs */ 294 struct timespec i_rctime; 295 u64 i_rbytes, i_rfiles, i_rsubdirs; 296 u64 i_files, i_subdirs; 297 298 struct rb_root i_fragtree; 299 struct mutex i_fragtree_mutex; 300 301 struct ceph_inode_xattrs_info i_xattrs; 302 303 /* capabilities. protected _both_ by i_ceph_lock and cap->session's 304 * s_mutex. */ 305 struct rb_root i_caps; /* cap list */ 306 struct ceph_cap *i_auth_cap; /* authoritative cap, if any */ 307 unsigned i_dirty_caps, i_flushing_caps; /* mask of dirtied fields */ 308 struct list_head i_dirty_item, i_flushing_item; 309 /* we need to track cap writeback on a per-cap-bit basis, to allow 310 * overlapping, pipelined cap flushes to the mds. we can probably 311 * reduce the tid to 8 bits if we're concerned about inode size. */ 312 struct ceph_cap_flush *i_prealloc_cap_flush; 313 struct rb_root i_cap_flush_tree; 314 wait_queue_head_t i_cap_wq; /* threads waiting on a capability */ 315 unsigned long i_hold_caps_min; /* jiffies */ 316 unsigned long i_hold_caps_max; /* jiffies */ 317 struct list_head i_cap_delay_list; /* for delayed cap release to mds */ 318 struct ceph_cap_reservation i_cap_migration_resv; 319 struct list_head i_cap_snaps; /* snapped state pending flush to mds */ 320 struct ceph_snap_context *i_head_snapc; /* set if wr_buffer_head > 0 or 321 dirty|flushing caps */ 322 unsigned i_snap_caps; /* cap bits for snapped files */ 323 324 int i_nr_by_mode[CEPH_FILE_MODE_NUM]; /* open file counts */ 325 326 struct mutex i_truncate_mutex; 327 u32 i_truncate_seq; /* last truncate to smaller size */ 328 u64 i_truncate_size; /* and the size we last truncated down to */ 329 int i_truncate_pending; /* still need to call vmtruncate */ 330 331 u64 i_max_size; /* max file size authorized by mds */ 332 u64 i_reported_size; /* (max_)size reported to or requested of mds */ 333 u64 i_wanted_max_size; /* offset we'd like to write too */ 334 u64 i_requested_max_size; /* max_size we've requested */ 335 336 /* held references to caps */ 337 int i_pin_ref; 338 int i_rd_ref, i_rdcache_ref, i_wr_ref, i_wb_ref; 339 int i_wrbuffer_ref, i_wrbuffer_ref_head; 340 u32 i_shared_gen; /* increment each time we get FILE_SHARED */ 341 u32 i_rdcache_gen; /* incremented each time we get FILE_CACHE. */ 342 u32 i_rdcache_revoking; /* RDCACHE gen to async invalidate, if any */ 343 344 struct list_head i_unsafe_writes; /* uncommitted sync writes */ 345 struct list_head i_unsafe_dirops; /* uncommitted mds dir ops */ 346 struct list_head i_unsafe_iops; /* uncommitted mds inode ops */ 347 spinlock_t i_unsafe_lock; 348 349 struct ceph_snap_realm *i_snap_realm; /* snap realm (if caps) */ 350 int i_snap_realm_counter; /* snap realm (if caps) */ 351 struct list_head i_snap_realm_item; 352 struct list_head i_snap_flush_item; 353 354 struct work_struct i_wb_work; /* writeback work */ 355 struct work_struct i_pg_inv_work; /* page invalidation work */ 356 357 struct work_struct i_vmtruncate_work; 358 359 #ifdef CONFIG_CEPH_FSCACHE 360 struct fscache_cookie *fscache; 361 u32 i_fscache_gen; /* sequence, for delayed fscache validate */ 362 struct work_struct i_revalidate_work; 363 #endif 364 struct inode vfs_inode; /* at end */ 365 }; 366 367 static inline struct ceph_inode_info *ceph_inode(struct inode *inode) 368 { 369 return container_of(inode, struct ceph_inode_info, vfs_inode); 370 } 371 372 static inline struct ceph_fs_client *ceph_inode_to_client(struct inode *inode) 373 { 374 return (struct ceph_fs_client *)inode->i_sb->s_fs_info; 375 } 376 377 static inline struct ceph_fs_client *ceph_sb_to_client(struct super_block *sb) 378 { 379 return (struct ceph_fs_client *)sb->s_fs_info; 380 } 381 382 static inline struct ceph_vino ceph_vino(struct inode *inode) 383 { 384 return ceph_inode(inode)->i_vino; 385 } 386 387 /* 388 * ino_t is <64 bits on many architectures, blech. 389 * 390 * i_ino (kernel inode) st_ino (userspace) 391 * i386 32 32 392 * x86_64+ino32 64 32 393 * x86_64 64 64 394 */ 395 static inline u32 ceph_ino_to_ino32(__u64 vino) 396 { 397 u32 ino = vino & 0xffffffff; 398 ino ^= vino >> 32; 399 if (!ino) 400 ino = 2; 401 return ino; 402 } 403 404 /* 405 * kernel i_ino value 406 */ 407 static inline ino_t ceph_vino_to_ino(struct ceph_vino vino) 408 { 409 #if BITS_PER_LONG == 32 410 return ceph_ino_to_ino32(vino.ino); 411 #else 412 return (ino_t)vino.ino; 413 #endif 414 } 415 416 /* 417 * user-visible ino (stat, filldir) 418 */ 419 #if BITS_PER_LONG == 32 420 static inline ino_t ceph_translate_ino(struct super_block *sb, ino_t ino) 421 { 422 return ino; 423 } 424 #else 425 static inline ino_t ceph_translate_ino(struct super_block *sb, ino_t ino) 426 { 427 if (ceph_test_mount_opt(ceph_sb_to_client(sb), INO32)) 428 ino = ceph_ino_to_ino32(ino); 429 return ino; 430 } 431 #endif 432 433 434 /* for printf-style formatting */ 435 #define ceph_vinop(i) ceph_inode(i)->i_vino.ino, ceph_inode(i)->i_vino.snap 436 437 static inline u64 ceph_ino(struct inode *inode) 438 { 439 return ceph_inode(inode)->i_vino.ino; 440 } 441 static inline u64 ceph_snap(struct inode *inode) 442 { 443 return ceph_inode(inode)->i_vino.snap; 444 } 445 446 static inline int ceph_ino_compare(struct inode *inode, void *data) 447 { 448 struct ceph_vino *pvino = (struct ceph_vino *)data; 449 struct ceph_inode_info *ci = ceph_inode(inode); 450 return ci->i_vino.ino == pvino->ino && 451 ci->i_vino.snap == pvino->snap; 452 } 453 454 static inline struct inode *ceph_find_inode(struct super_block *sb, 455 struct ceph_vino vino) 456 { 457 ino_t t = ceph_vino_to_ino(vino); 458 return ilookup5(sb, t, ceph_ino_compare, &vino); 459 } 460 461 462 /* 463 * Ceph inode. 464 */ 465 #define CEPH_I_DIR_ORDERED (1 << 0) /* dentries in dir are ordered */ 466 #define CEPH_I_NODELAY (1 << 1) /* do not delay cap release */ 467 #define CEPH_I_FLUSH (1 << 2) /* do not delay flush of dirty metadata */ 468 #define CEPH_I_NOFLUSH (1 << 3) /* do not flush dirty caps */ 469 #define CEPH_I_POOL_PERM (1 << 4) /* pool rd/wr bits are valid */ 470 #define CEPH_I_POOL_RD (1 << 5) /* can read from pool */ 471 #define CEPH_I_POOL_WR (1 << 6) /* can write to pool */ 472 473 474 static inline void __ceph_dir_set_complete(struct ceph_inode_info *ci, 475 long long release_count, 476 long long ordered_count) 477 { 478 smp_mb__before_atomic(); 479 atomic64_set(&ci->i_complete_seq[0], release_count); 480 atomic64_set(&ci->i_complete_seq[1], ordered_count); 481 } 482 483 static inline void __ceph_dir_clear_complete(struct ceph_inode_info *ci) 484 { 485 atomic64_inc(&ci->i_release_count); 486 } 487 488 static inline void __ceph_dir_clear_ordered(struct ceph_inode_info *ci) 489 { 490 atomic64_inc(&ci->i_ordered_count); 491 } 492 493 static inline bool __ceph_dir_is_complete(struct ceph_inode_info *ci) 494 { 495 return atomic64_read(&ci->i_complete_seq[0]) == 496 atomic64_read(&ci->i_release_count); 497 } 498 499 static inline bool __ceph_dir_is_complete_ordered(struct ceph_inode_info *ci) 500 { 501 return atomic64_read(&ci->i_complete_seq[0]) == 502 atomic64_read(&ci->i_release_count) && 503 atomic64_read(&ci->i_complete_seq[1]) == 504 atomic64_read(&ci->i_ordered_count); 505 } 506 507 static inline void ceph_dir_clear_complete(struct inode *inode) 508 { 509 __ceph_dir_clear_complete(ceph_inode(inode)); 510 } 511 512 static inline void ceph_dir_clear_ordered(struct inode *inode) 513 { 514 __ceph_dir_clear_ordered(ceph_inode(inode)); 515 } 516 517 static inline bool ceph_dir_is_complete_ordered(struct inode *inode) 518 { 519 bool ret = __ceph_dir_is_complete_ordered(ceph_inode(inode)); 520 smp_rmb(); 521 return ret; 522 } 523 524 /* find a specific frag @f */ 525 extern struct ceph_inode_frag *__ceph_find_frag(struct ceph_inode_info *ci, 526 u32 f); 527 528 /* 529 * choose fragment for value @v. copy frag content to pfrag, if leaf 530 * exists 531 */ 532 extern u32 ceph_choose_frag(struct ceph_inode_info *ci, u32 v, 533 struct ceph_inode_frag *pfrag, 534 int *found); 535 536 static inline struct ceph_dentry_info *ceph_dentry(struct dentry *dentry) 537 { 538 return (struct ceph_dentry_info *)dentry->d_fsdata; 539 } 540 541 static inline loff_t ceph_make_fpos(unsigned frag, unsigned off) 542 { 543 return ((loff_t)frag << 32) | (loff_t)off; 544 } 545 546 /* 547 * caps helpers 548 */ 549 static inline bool __ceph_is_any_real_caps(struct ceph_inode_info *ci) 550 { 551 return !RB_EMPTY_ROOT(&ci->i_caps); 552 } 553 554 extern int __ceph_caps_issued(struct ceph_inode_info *ci, int *implemented); 555 extern int __ceph_caps_issued_mask(struct ceph_inode_info *ci, int mask, int t); 556 extern int __ceph_caps_issued_other(struct ceph_inode_info *ci, 557 struct ceph_cap *cap); 558 559 static inline int ceph_caps_issued(struct ceph_inode_info *ci) 560 { 561 int issued; 562 spin_lock(&ci->i_ceph_lock); 563 issued = __ceph_caps_issued(ci, NULL); 564 spin_unlock(&ci->i_ceph_lock); 565 return issued; 566 } 567 568 static inline int ceph_caps_issued_mask(struct ceph_inode_info *ci, int mask, 569 int touch) 570 { 571 int r; 572 spin_lock(&ci->i_ceph_lock); 573 r = __ceph_caps_issued_mask(ci, mask, touch); 574 spin_unlock(&ci->i_ceph_lock); 575 return r; 576 } 577 578 static inline int __ceph_caps_dirty(struct ceph_inode_info *ci) 579 { 580 return ci->i_dirty_caps | ci->i_flushing_caps; 581 } 582 extern struct ceph_cap_flush *ceph_alloc_cap_flush(void); 583 extern void ceph_free_cap_flush(struct ceph_cap_flush *cf); 584 extern int __ceph_mark_dirty_caps(struct ceph_inode_info *ci, int mask, 585 struct ceph_cap_flush **pcf); 586 587 extern int __ceph_caps_revoking_other(struct ceph_inode_info *ci, 588 struct ceph_cap *ocap, int mask); 589 extern int ceph_caps_revoking(struct ceph_inode_info *ci, int mask); 590 extern int __ceph_caps_used(struct ceph_inode_info *ci); 591 592 extern int __ceph_caps_file_wanted(struct ceph_inode_info *ci); 593 594 /* 595 * wanted, by virtue of open file modes AND cap refs (buffered/cached data) 596 */ 597 static inline int __ceph_caps_wanted(struct ceph_inode_info *ci) 598 { 599 int w = __ceph_caps_file_wanted(ci) | __ceph_caps_used(ci); 600 if (w & CEPH_CAP_FILE_BUFFER) 601 w |= CEPH_CAP_FILE_EXCL; /* we want EXCL if dirty data */ 602 return w; 603 } 604 605 /* what the mds thinks we want */ 606 extern int __ceph_caps_mds_wanted(struct ceph_inode_info *ci); 607 608 extern void ceph_caps_init(struct ceph_mds_client *mdsc); 609 extern void ceph_caps_finalize(struct ceph_mds_client *mdsc); 610 extern void ceph_adjust_min_caps(struct ceph_mds_client *mdsc, int delta); 611 extern void ceph_reserve_caps(struct ceph_mds_client *mdsc, 612 struct ceph_cap_reservation *ctx, int need); 613 extern int ceph_unreserve_caps(struct ceph_mds_client *mdsc, 614 struct ceph_cap_reservation *ctx); 615 extern void ceph_reservation_status(struct ceph_fs_client *client, 616 int *total, int *avail, int *used, 617 int *reserved, int *min); 618 619 620 621 /* 622 * we keep buffered readdir results attached to file->private_data 623 */ 624 #define CEPH_F_SYNC 1 625 #define CEPH_F_ATEND 2 626 627 struct ceph_file_info { 628 short fmode; /* initialized on open */ 629 short flags; /* CEPH_F_* */ 630 631 /* readdir: position within the dir */ 632 u32 frag; 633 struct ceph_mds_request *last_readdir; 634 635 /* readdir: position within a frag */ 636 unsigned offset; /* offset of last chunk, adjusted for . and .. */ 637 unsigned next_offset; /* offset of next chunk (last_name's + 1) */ 638 char *last_name; /* last entry in previous chunk */ 639 long long dir_release_count; 640 long long dir_ordered_count; 641 int readdir_cache_idx; 642 643 /* used for -o dirstat read() on directory thing */ 644 char *dir_info; 645 int dir_info_len; 646 }; 647 648 struct ceph_readdir_cache_control { 649 struct page *page; 650 struct dentry **dentries; 651 int index; 652 }; 653 654 /* 655 * A "snap realm" describes a subset of the file hierarchy sharing 656 * the same set of snapshots that apply to it. The realms themselves 657 * are organized into a hierarchy, such that children inherit (some of) 658 * the snapshots of their parents. 659 * 660 * All inodes within the realm that have capabilities are linked into a 661 * per-realm list. 662 */ 663 struct ceph_snap_realm { 664 u64 ino; 665 atomic_t nref; 666 struct rb_node node; 667 668 u64 created, seq; 669 u64 parent_ino; 670 u64 parent_since; /* snapid when our current parent became so */ 671 672 u64 *prior_parent_snaps; /* snaps inherited from any parents we */ 673 u32 num_prior_parent_snaps; /* had prior to parent_since */ 674 u64 *snaps; /* snaps specific to this realm */ 675 u32 num_snaps; 676 677 struct ceph_snap_realm *parent; 678 struct list_head children; /* list of child realms */ 679 struct list_head child_item; 680 681 struct list_head empty_item; /* if i have ref==0 */ 682 683 struct list_head dirty_item; /* if realm needs new context */ 684 685 /* the current set of snaps for this realm */ 686 struct ceph_snap_context *cached_context; 687 688 struct list_head inodes_with_caps; 689 spinlock_t inodes_with_caps_lock; 690 }; 691 692 static inline int default_congestion_kb(void) 693 { 694 int congestion_kb; 695 696 /* 697 * Copied from NFS 698 * 699 * congestion size, scale with available memory. 700 * 701 * 64MB: 8192k 702 * 128MB: 11585k 703 * 256MB: 16384k 704 * 512MB: 23170k 705 * 1GB: 32768k 706 * 2GB: 46340k 707 * 4GB: 65536k 708 * 8GB: 92681k 709 * 16GB: 131072k 710 * 711 * This allows larger machines to have larger/more transfers. 712 * Limit the default to 256M 713 */ 714 congestion_kb = (16*int_sqrt(totalram_pages)) << (PAGE_SHIFT-10); 715 if (congestion_kb > 256*1024) 716 congestion_kb = 256*1024; 717 718 return congestion_kb; 719 } 720 721 722 723 /* snap.c */ 724 extern struct ceph_snap_context *ceph_empty_snapc; 725 struct ceph_snap_realm *ceph_lookup_snap_realm(struct ceph_mds_client *mdsc, 726 u64 ino); 727 extern void ceph_get_snap_realm(struct ceph_mds_client *mdsc, 728 struct ceph_snap_realm *realm); 729 extern void ceph_put_snap_realm(struct ceph_mds_client *mdsc, 730 struct ceph_snap_realm *realm); 731 extern int ceph_update_snap_trace(struct ceph_mds_client *m, 732 void *p, void *e, bool deletion, 733 struct ceph_snap_realm **realm_ret); 734 extern void ceph_handle_snap(struct ceph_mds_client *mdsc, 735 struct ceph_mds_session *session, 736 struct ceph_msg *msg); 737 extern void ceph_queue_cap_snap(struct ceph_inode_info *ci); 738 extern int __ceph_finish_cap_snap(struct ceph_inode_info *ci, 739 struct ceph_cap_snap *capsnap); 740 extern void ceph_cleanup_empty_realms(struct ceph_mds_client *mdsc); 741 extern int ceph_snap_init(void); 742 extern void ceph_snap_exit(void); 743 744 /* 745 * a cap_snap is "pending" if it is still awaiting an in-progress 746 * sync write (that may/may not still update size, mtime, etc.). 747 */ 748 static inline bool __ceph_have_pending_cap_snap(struct ceph_inode_info *ci) 749 { 750 return !list_empty(&ci->i_cap_snaps) && 751 list_last_entry(&ci->i_cap_snaps, struct ceph_cap_snap, 752 ci_item)->writing; 753 } 754 755 /* inode.c */ 756 extern const struct inode_operations ceph_file_iops; 757 758 extern struct inode *ceph_alloc_inode(struct super_block *sb); 759 extern void ceph_destroy_inode(struct inode *inode); 760 extern int ceph_drop_inode(struct inode *inode); 761 762 extern struct inode *ceph_get_inode(struct super_block *sb, 763 struct ceph_vino vino); 764 extern struct inode *ceph_get_snapdir(struct inode *parent); 765 extern int ceph_fill_file_size(struct inode *inode, int issued, 766 u32 truncate_seq, u64 truncate_size, u64 size); 767 extern void ceph_fill_file_time(struct inode *inode, int issued, 768 u64 time_warp_seq, struct timespec *ctime, 769 struct timespec *mtime, struct timespec *atime); 770 extern int ceph_fill_trace(struct super_block *sb, 771 struct ceph_mds_request *req, 772 struct ceph_mds_session *session); 773 extern int ceph_readdir_prepopulate(struct ceph_mds_request *req, 774 struct ceph_mds_session *session); 775 776 extern int ceph_inode_holds_cap(struct inode *inode, int mask); 777 778 extern int ceph_inode_set_size(struct inode *inode, loff_t size); 779 extern void __ceph_do_pending_vmtruncate(struct inode *inode); 780 extern void ceph_queue_vmtruncate(struct inode *inode); 781 782 extern void ceph_queue_invalidate(struct inode *inode); 783 extern void ceph_queue_writeback(struct inode *inode); 784 785 extern int __ceph_do_getattr(struct inode *inode, struct page *locked_page, 786 int mask, bool force); 787 static inline int ceph_do_getattr(struct inode *inode, int mask, bool force) 788 { 789 return __ceph_do_getattr(inode, NULL, mask, force); 790 } 791 extern int ceph_permission(struct inode *inode, int mask); 792 extern int ceph_setattr(struct dentry *dentry, struct iattr *attr); 793 extern int ceph_getattr(struct vfsmount *mnt, struct dentry *dentry, 794 struct kstat *stat); 795 796 /* xattr.c */ 797 extern int ceph_setxattr(struct dentry *, const char *, const void *, 798 size_t, int); 799 int __ceph_setxattr(struct dentry *, const char *, const void *, size_t, int); 800 ssize_t __ceph_getxattr(struct inode *, const char *, void *, size_t); 801 int __ceph_removexattr(struct dentry *, const char *); 802 extern ssize_t ceph_getxattr(struct dentry *, const char *, void *, size_t); 803 extern ssize_t ceph_listxattr(struct dentry *, char *, size_t); 804 extern int ceph_removexattr(struct dentry *, const char *); 805 extern void __ceph_build_xattrs_blob(struct ceph_inode_info *ci); 806 extern void __ceph_destroy_xattrs(struct ceph_inode_info *ci); 807 extern void __init ceph_xattr_init(void); 808 extern void ceph_xattr_exit(void); 809 extern const struct xattr_handler *ceph_xattr_handlers[]; 810 811 /* acl.c */ 812 struct ceph_acls_info { 813 void *default_acl; 814 void *acl; 815 struct ceph_pagelist *pagelist; 816 }; 817 818 #ifdef CONFIG_CEPH_FS_POSIX_ACL 819 820 struct posix_acl *ceph_get_acl(struct inode *, int); 821 int ceph_set_acl(struct inode *inode, struct posix_acl *acl, int type); 822 int ceph_pre_init_acls(struct inode *dir, umode_t *mode, 823 struct ceph_acls_info *info); 824 void ceph_init_inode_acls(struct inode *inode, struct ceph_acls_info *info); 825 void ceph_release_acls_info(struct ceph_acls_info *info); 826 827 static inline void ceph_forget_all_cached_acls(struct inode *inode) 828 { 829 forget_all_cached_acls(inode); 830 } 831 832 #else 833 834 #define ceph_get_acl NULL 835 #define ceph_set_acl NULL 836 837 static inline int ceph_pre_init_acls(struct inode *dir, umode_t *mode, 838 struct ceph_acls_info *info) 839 { 840 return 0; 841 } 842 static inline void ceph_init_inode_acls(struct inode *inode, 843 struct ceph_acls_info *info) 844 { 845 } 846 static inline void ceph_release_acls_info(struct ceph_acls_info *info) 847 { 848 } 849 static inline int ceph_acl_chmod(struct dentry *dentry, struct inode *inode) 850 { 851 return 0; 852 } 853 854 static inline void ceph_forget_all_cached_acls(struct inode *inode) 855 { 856 } 857 858 #endif 859 860 /* caps.c */ 861 extern const char *ceph_cap_string(int c); 862 extern void ceph_handle_caps(struct ceph_mds_session *session, 863 struct ceph_msg *msg); 864 extern struct ceph_cap *ceph_get_cap(struct ceph_mds_client *mdsc, 865 struct ceph_cap_reservation *ctx); 866 extern void ceph_add_cap(struct inode *inode, 867 struct ceph_mds_session *session, u64 cap_id, 868 int fmode, unsigned issued, unsigned wanted, 869 unsigned cap, unsigned seq, u64 realmino, int flags, 870 struct ceph_cap **new_cap); 871 extern void __ceph_remove_cap(struct ceph_cap *cap, bool queue_release); 872 extern void ceph_put_cap(struct ceph_mds_client *mdsc, 873 struct ceph_cap *cap); 874 extern int ceph_is_any_caps(struct inode *inode); 875 876 extern void ceph_queue_caps_release(struct inode *inode); 877 extern int ceph_write_inode(struct inode *inode, struct writeback_control *wbc); 878 extern int ceph_fsync(struct file *file, loff_t start, loff_t end, 879 int datasync); 880 extern void ceph_early_kick_flushing_caps(struct ceph_mds_client *mdsc, 881 struct ceph_mds_session *session); 882 extern void ceph_kick_flushing_caps(struct ceph_mds_client *mdsc, 883 struct ceph_mds_session *session); 884 extern struct ceph_cap *ceph_get_cap_for_mds(struct ceph_inode_info *ci, 885 int mds); 886 extern int ceph_get_cap_mds(struct inode *inode); 887 extern void ceph_get_cap_refs(struct ceph_inode_info *ci, int caps); 888 extern void ceph_put_cap_refs(struct ceph_inode_info *ci, int had); 889 extern void ceph_put_wrbuffer_cap_refs(struct ceph_inode_info *ci, int nr, 890 struct ceph_snap_context *snapc); 891 extern void __ceph_flush_snaps(struct ceph_inode_info *ci, 892 struct ceph_mds_session **psession, 893 int again); 894 extern void ceph_check_caps(struct ceph_inode_info *ci, int flags, 895 struct ceph_mds_session *session); 896 extern void ceph_check_delayed_caps(struct ceph_mds_client *mdsc); 897 extern void ceph_flush_dirty_caps(struct ceph_mds_client *mdsc); 898 899 extern int ceph_encode_inode_release(void **p, struct inode *inode, 900 int mds, int drop, int unless, int force); 901 extern int ceph_encode_dentry_release(void **p, struct dentry *dn, 902 int mds, int drop, int unless); 903 904 extern int ceph_get_caps(struct ceph_inode_info *ci, int need, int want, 905 loff_t endoff, int *got, struct page **pinned_page); 906 907 /* for counting open files by mode */ 908 static inline void __ceph_get_fmode(struct ceph_inode_info *ci, int mode) 909 { 910 ci->i_nr_by_mode[mode]++; 911 } 912 extern void ceph_put_fmode(struct ceph_inode_info *ci, int mode); 913 914 /* addr.c */ 915 extern const struct address_space_operations ceph_aops; 916 extern int ceph_mmap(struct file *file, struct vm_area_struct *vma); 917 extern int ceph_uninline_data(struct file *filp, struct page *locked_page); 918 extern int ceph_pool_perm_check(struct ceph_inode_info *ci, int need); 919 extern void ceph_pool_perm_destroy(struct ceph_mds_client* mdsc); 920 921 /* file.c */ 922 extern const struct file_operations ceph_file_fops; 923 924 extern int ceph_open(struct inode *inode, struct file *file); 925 extern int ceph_atomic_open(struct inode *dir, struct dentry *dentry, 926 struct file *file, unsigned flags, umode_t mode, 927 int *opened); 928 extern int ceph_release(struct inode *inode, struct file *filp); 929 extern void ceph_fill_inline_data(struct inode *inode, struct page *locked_page, 930 char *data, size_t len); 931 /* dir.c */ 932 extern const struct file_operations ceph_dir_fops; 933 extern const struct file_operations ceph_snapdir_fops; 934 extern const struct inode_operations ceph_dir_iops; 935 extern const struct inode_operations ceph_snapdir_iops; 936 extern const struct dentry_operations ceph_dentry_ops, ceph_snap_dentry_ops, 937 ceph_snapdir_dentry_ops; 938 939 extern int ceph_handle_notrace_create(struct inode *dir, struct dentry *dentry); 940 extern int ceph_handle_snapdir(struct ceph_mds_request *req, 941 struct dentry *dentry, int err); 942 extern struct dentry *ceph_finish_lookup(struct ceph_mds_request *req, 943 struct dentry *dentry, int err); 944 945 extern void ceph_dentry_lru_add(struct dentry *dn); 946 extern void ceph_dentry_lru_touch(struct dentry *dn); 947 extern void ceph_dentry_lru_del(struct dentry *dn); 948 extern void ceph_invalidate_dentry_lease(struct dentry *dentry); 949 extern unsigned ceph_dentry_hash(struct inode *dir, struct dentry *dn); 950 extern struct inode *ceph_get_dentry_parent_inode(struct dentry *dentry); 951 extern void ceph_readdir_cache_release(struct ceph_readdir_cache_control *ctl); 952 953 /* 954 * our d_ops vary depending on whether the inode is live, 955 * snapshotted (read-only), or a virtual ".snap" directory. 956 */ 957 int ceph_init_dentry(struct dentry *dentry); 958 959 960 /* ioctl.c */ 961 extern long ceph_ioctl(struct file *file, unsigned int cmd, unsigned long arg); 962 963 /* export.c */ 964 extern const struct export_operations ceph_export_ops; 965 966 /* locks.c */ 967 extern __init void ceph_flock_init(void); 968 extern int ceph_lock(struct file *file, int cmd, struct file_lock *fl); 969 extern int ceph_flock(struct file *file, int cmd, struct file_lock *fl); 970 extern void ceph_count_locks(struct inode *inode, int *p_num, int *f_num); 971 extern int ceph_encode_locks_to_buffer(struct inode *inode, 972 struct ceph_filelock *flocks, 973 int num_fcntl_locks, 974 int num_flock_locks); 975 extern int ceph_locks_to_pagelist(struct ceph_filelock *flocks, 976 struct ceph_pagelist *pagelist, 977 int num_fcntl_locks, int num_flock_locks); 978 extern int lock_to_ceph_filelock(struct file_lock *fl, struct ceph_filelock *c); 979 980 /* debugfs.c */ 981 extern int ceph_fs_debugfs_init(struct ceph_fs_client *client); 982 extern void ceph_fs_debugfs_cleanup(struct ceph_fs_client *client); 983 984 #endif /* _FS_CEPH_SUPER_H */ 985