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 17 #include <linux/ceph/libceph.h> 18 19 /* f_type in struct statfs */ 20 #define CEPH_SUPER_MAGIC 0x00c36400 21 22 /* large granularity for statfs utilization stats to facilitate 23 * large volume sizes on 32-bit machines. */ 24 #define CEPH_BLOCK_SHIFT 22 /* 4 MB */ 25 #define CEPH_BLOCK (1 << CEPH_BLOCK_SHIFT) 26 27 #define CEPH_MOUNT_OPT_DIRSTAT (1<<4) /* `cat dirname` for stats */ 28 #define CEPH_MOUNT_OPT_RBYTES (1<<5) /* dir st_bytes = rbytes */ 29 #define CEPH_MOUNT_OPT_NOASYNCREADDIR (1<<7) /* no dcache readdir */ 30 #define CEPH_MOUNT_OPT_INO32 (1<<8) /* 32 bit inos */ 31 #define CEPH_MOUNT_OPT_DCACHE (1<<9) /* use dcache for readdir etc */ 32 33 #define CEPH_MOUNT_OPT_DEFAULT (CEPH_MOUNT_OPT_RBYTES) 34 35 #define ceph_set_mount_opt(fsc, opt) \ 36 (fsc)->mount_options->flags |= CEPH_MOUNT_OPT_##opt; 37 #define ceph_test_mount_opt(fsc, opt) \ 38 (!!((fsc)->mount_options->flags & CEPH_MOUNT_OPT_##opt)) 39 40 #define CEPH_RSIZE_DEFAULT 0 /* max read size */ 41 #define CEPH_RASIZE_DEFAULT (8192*1024) /* readahead */ 42 #define CEPH_MAX_READDIR_DEFAULT 1024 43 #define CEPH_MAX_READDIR_BYTES_DEFAULT (512*1024) 44 #define CEPH_SNAPDIRNAME_DEFAULT ".snap" 45 46 struct ceph_mount_options { 47 int flags; 48 int sb_flags; 49 50 int wsize; /* max write size */ 51 int rsize; /* max read size */ 52 int rasize; /* max readahead */ 53 int congestion_kb; /* max writeback in flight */ 54 int caps_wanted_delay_min, caps_wanted_delay_max; 55 int cap_release_safety; 56 int max_readdir; /* max readdir result (entires) */ 57 int max_readdir_bytes; /* max readdir result (bytes) */ 58 59 /* 60 * everything above this point can be memcmp'd; everything below 61 * is handled in compare_mount_options() 62 */ 63 64 char *snapdir_name; /* default ".snap" */ 65 }; 66 67 struct ceph_fs_client { 68 struct super_block *sb; 69 70 struct ceph_mount_options *mount_options; 71 struct ceph_client *client; 72 73 unsigned long mount_state; 74 int min_caps; /* min caps i added */ 75 76 struct ceph_mds_client *mdsc; 77 78 /* writeback */ 79 mempool_t *wb_pagevec_pool; 80 struct workqueue_struct *wb_wq; 81 struct workqueue_struct *pg_inv_wq; 82 struct workqueue_struct *trunc_wq; 83 atomic_long_t writeback_count; 84 85 struct backing_dev_info backing_dev_info; 86 87 #ifdef CONFIG_DEBUG_FS 88 struct dentry *debugfs_dentry_lru, *debugfs_caps; 89 struct dentry *debugfs_congestion_kb; 90 struct dentry *debugfs_bdi; 91 struct dentry *debugfs_mdsc, *debugfs_mdsmap; 92 #endif 93 }; 94 95 96 /* 97 * File i/o capability. This tracks shared state with the metadata 98 * server that allows us to cache or writeback attributes or to read 99 * and write data. For any given inode, we should have one or more 100 * capabilities, one issued by each metadata server, and our 101 * cumulative access is the OR of all issued capabilities. 102 * 103 * Each cap is referenced by the inode's i_caps rbtree and by per-mds 104 * session capability lists. 105 */ 106 struct ceph_cap { 107 struct ceph_inode_info *ci; 108 struct rb_node ci_node; /* per-ci cap tree */ 109 struct ceph_mds_session *session; 110 struct list_head session_caps; /* per-session caplist */ 111 int mds; 112 u64 cap_id; /* unique cap id (mds provided) */ 113 int issued; /* latest, from the mds */ 114 int implemented; /* implemented superset of issued (for revocation) */ 115 int mds_wanted; 116 u32 seq, issue_seq, mseq; 117 u32 cap_gen; /* active/stale cycle */ 118 unsigned long last_used; 119 struct list_head caps_item; 120 }; 121 122 #define CHECK_CAPS_NODELAY 1 /* do not delay any further */ 123 #define CHECK_CAPS_AUTHONLY 2 /* only check auth cap */ 124 #define CHECK_CAPS_FLUSH 4 /* flush any dirty caps */ 125 126 /* 127 * Snapped cap state that is pending flush to mds. When a snapshot occurs, 128 * we first complete any in-process sync writes and writeback any dirty 129 * data before flushing the snapped state (tracked here) back to the MDS. 130 */ 131 struct ceph_cap_snap { 132 atomic_t nref; 133 struct ceph_inode_info *ci; 134 struct list_head ci_item, flushing_item; 135 136 u64 follows, flush_tid; 137 int issued, dirty; 138 struct ceph_snap_context *context; 139 140 umode_t mode; 141 kuid_t uid; 142 kgid_t gid; 143 144 struct ceph_buffer *xattr_blob; 145 u64 xattr_version; 146 147 u64 size; 148 struct timespec mtime, atime, ctime; 149 u64 time_warp_seq; 150 int writing; /* a sync write is still in progress */ 151 int dirty_pages; /* dirty pages awaiting writeback */ 152 }; 153 154 static inline void ceph_put_cap_snap(struct ceph_cap_snap *capsnap) 155 { 156 if (atomic_dec_and_test(&capsnap->nref)) { 157 if (capsnap->xattr_blob) 158 ceph_buffer_put(capsnap->xattr_blob); 159 kfree(capsnap); 160 } 161 } 162 163 /* 164 * The frag tree describes how a directory is fragmented, potentially across 165 * multiple metadata servers. It is also used to indicate points where 166 * metadata authority is delegated, and whether/where metadata is replicated. 167 * 168 * A _leaf_ frag will be present in the i_fragtree IFF there is 169 * delegation info. That is, if mds >= 0 || ndist > 0. 170 */ 171 #define CEPH_MAX_DIRFRAG_REP 4 172 173 struct ceph_inode_frag { 174 struct rb_node node; 175 176 /* fragtree state */ 177 u32 frag; 178 int split_by; /* i.e. 2^(split_by) children */ 179 180 /* delegation and replication info */ 181 int mds; /* -1 if same authority as parent */ 182 int ndist; /* >0 if replicated */ 183 int dist[CEPH_MAX_DIRFRAG_REP]; 184 }; 185 186 /* 187 * We cache inode xattrs as an encoded blob until they are first used, 188 * at which point we parse them into an rbtree. 189 */ 190 struct ceph_inode_xattr { 191 struct rb_node node; 192 193 const char *name; 194 int name_len; 195 const char *val; 196 int val_len; 197 int dirty; 198 199 int should_free_name; 200 int should_free_val; 201 }; 202 203 /* 204 * Ceph dentry state 205 */ 206 struct ceph_dentry_info { 207 struct ceph_mds_session *lease_session; 208 u32 lease_gen, lease_shared_gen; 209 u32 lease_seq; 210 unsigned long lease_renew_after, lease_renew_from; 211 struct list_head lru; 212 struct dentry *dentry; 213 u64 time; 214 u64 offset; 215 }; 216 217 struct ceph_inode_xattrs_info { 218 /* 219 * (still encoded) xattr blob. we avoid the overhead of parsing 220 * this until someone actually calls getxattr, etc. 221 * 222 * blob->vec.iov_len == 4 implies there are no xattrs; blob == 223 * NULL means we don't know. 224 */ 225 struct ceph_buffer *blob, *prealloc_blob; 226 227 struct rb_root index; 228 bool dirty; 229 int count; 230 int names_size; 231 int vals_size; 232 u64 version, index_version; 233 }; 234 235 /* 236 * Ceph inode. 237 */ 238 struct ceph_inode_info { 239 struct ceph_vino i_vino; /* ceph ino + snap */ 240 241 spinlock_t i_ceph_lock; 242 243 u64 i_version; 244 u32 i_time_warp_seq; 245 246 unsigned i_ceph_flags; 247 atomic_t i_release_count; 248 atomic_t i_complete_count; 249 250 struct ceph_dir_layout i_dir_layout; 251 struct ceph_file_layout i_layout; 252 char *i_symlink; 253 254 /* for dirs */ 255 struct timespec i_rctime; 256 u64 i_rbytes, i_rfiles, i_rsubdirs; 257 u64 i_files, i_subdirs; 258 u64 i_max_offset; /* largest readdir offset, set with complete dir */ 259 260 struct rb_root i_fragtree; 261 struct mutex i_fragtree_mutex; 262 263 struct ceph_inode_xattrs_info i_xattrs; 264 265 /* capabilities. protected _both_ by i_ceph_lock and cap->session's 266 * s_mutex. */ 267 struct rb_root i_caps; /* cap list */ 268 struct ceph_cap *i_auth_cap; /* authoritative cap, if any */ 269 unsigned i_dirty_caps, i_flushing_caps; /* mask of dirtied fields */ 270 struct list_head i_dirty_item, i_flushing_item; 271 u64 i_cap_flush_seq; 272 /* we need to track cap writeback on a per-cap-bit basis, to allow 273 * overlapping, pipelined cap flushes to the mds. we can probably 274 * reduce the tid to 8 bits if we're concerned about inode size. */ 275 u16 i_cap_flush_last_tid, i_cap_flush_tid[CEPH_CAP_BITS]; 276 wait_queue_head_t i_cap_wq; /* threads waiting on a capability */ 277 unsigned long i_hold_caps_min; /* jiffies */ 278 unsigned long i_hold_caps_max; /* jiffies */ 279 struct list_head i_cap_delay_list; /* for delayed cap release to mds */ 280 int i_cap_exporting_mds; /* to handle cap migration between */ 281 unsigned i_cap_exporting_mseq; /* mds's. */ 282 unsigned i_cap_exporting_issued; 283 struct ceph_cap_reservation i_cap_migration_resv; 284 struct list_head i_cap_snaps; /* snapped state pending flush to mds */ 285 struct ceph_snap_context *i_head_snapc; /* set if wr_buffer_head > 0 or 286 dirty|flushing caps */ 287 unsigned i_snap_caps; /* cap bits for snapped files */ 288 289 int i_nr_by_mode[CEPH_FILE_MODE_NUM]; /* open file counts */ 290 291 u32 i_truncate_seq; /* last truncate to smaller size */ 292 u64 i_truncate_size; /* and the size we last truncated down to */ 293 int i_truncate_pending; /* still need to call vmtruncate */ 294 295 u64 i_max_size; /* max file size authorized by mds */ 296 u64 i_reported_size; /* (max_)size reported to or requested of mds */ 297 u64 i_wanted_max_size; /* offset we'd like to write too */ 298 u64 i_requested_max_size; /* max_size we've requested */ 299 300 /* held references to caps */ 301 int i_pin_ref; 302 int i_rd_ref, i_rdcache_ref, i_wr_ref, i_wb_ref; 303 int i_wrbuffer_ref, i_wrbuffer_ref_head; 304 u32 i_shared_gen; /* increment each time we get FILE_SHARED */ 305 u32 i_rdcache_gen; /* incremented each time we get FILE_CACHE. */ 306 u32 i_rdcache_revoking; /* RDCACHE gen to async invalidate, if any */ 307 308 struct list_head i_unsafe_writes; /* uncommitted sync writes */ 309 struct list_head i_unsafe_dirops; /* uncommitted mds dir ops */ 310 spinlock_t i_unsafe_lock; 311 312 struct ceph_snap_realm *i_snap_realm; /* snap realm (if caps) */ 313 int i_snap_realm_counter; /* snap realm (if caps) */ 314 struct list_head i_snap_realm_item; 315 struct list_head i_snap_flush_item; 316 317 struct work_struct i_wb_work; /* writeback work */ 318 struct work_struct i_pg_inv_work; /* page invalidation work */ 319 320 struct work_struct i_vmtruncate_work; 321 322 struct inode vfs_inode; /* at end */ 323 }; 324 325 static inline struct ceph_inode_info *ceph_inode(struct inode *inode) 326 { 327 return container_of(inode, struct ceph_inode_info, vfs_inode); 328 } 329 330 static inline struct ceph_fs_client *ceph_inode_to_client(struct inode *inode) 331 { 332 return (struct ceph_fs_client *)inode->i_sb->s_fs_info; 333 } 334 335 static inline struct ceph_fs_client *ceph_sb_to_client(struct super_block *sb) 336 { 337 return (struct ceph_fs_client *)sb->s_fs_info; 338 } 339 340 static inline struct ceph_vino ceph_vino(struct inode *inode) 341 { 342 return ceph_inode(inode)->i_vino; 343 } 344 345 /* 346 * ino_t is <64 bits on many architectures, blech. 347 * 348 * i_ino (kernel inode) st_ino (userspace) 349 * i386 32 32 350 * x86_64+ino32 64 32 351 * x86_64 64 64 352 */ 353 static inline u32 ceph_ino_to_ino32(__u64 vino) 354 { 355 u32 ino = vino & 0xffffffff; 356 ino ^= vino >> 32; 357 if (!ino) 358 ino = 2; 359 return ino; 360 } 361 362 /* 363 * kernel i_ino value 364 */ 365 static inline ino_t ceph_vino_to_ino(struct ceph_vino vino) 366 { 367 #if BITS_PER_LONG == 32 368 return ceph_ino_to_ino32(vino.ino); 369 #else 370 return (ino_t)vino.ino; 371 #endif 372 } 373 374 /* 375 * user-visible ino (stat, filldir) 376 */ 377 #if BITS_PER_LONG == 32 378 static inline ino_t ceph_translate_ino(struct super_block *sb, ino_t ino) 379 { 380 return ino; 381 } 382 #else 383 static inline ino_t ceph_translate_ino(struct super_block *sb, ino_t ino) 384 { 385 if (ceph_test_mount_opt(ceph_sb_to_client(sb), INO32)) 386 ino = ceph_ino_to_ino32(ino); 387 return ino; 388 } 389 #endif 390 391 392 /* for printf-style formatting */ 393 #define ceph_vinop(i) ceph_inode(i)->i_vino.ino, ceph_inode(i)->i_vino.snap 394 395 static inline u64 ceph_ino(struct inode *inode) 396 { 397 return ceph_inode(inode)->i_vino.ino; 398 } 399 static inline u64 ceph_snap(struct inode *inode) 400 { 401 return ceph_inode(inode)->i_vino.snap; 402 } 403 404 static inline int ceph_ino_compare(struct inode *inode, void *data) 405 { 406 struct ceph_vino *pvino = (struct ceph_vino *)data; 407 struct ceph_inode_info *ci = ceph_inode(inode); 408 return ci->i_vino.ino == pvino->ino && 409 ci->i_vino.snap == pvino->snap; 410 } 411 412 static inline struct inode *ceph_find_inode(struct super_block *sb, 413 struct ceph_vino vino) 414 { 415 ino_t t = ceph_vino_to_ino(vino); 416 return ilookup5(sb, t, ceph_ino_compare, &vino); 417 } 418 419 420 /* 421 * Ceph inode. 422 */ 423 #define CEPH_I_NODELAY 4 /* do not delay cap release */ 424 #define CEPH_I_FLUSH 8 /* do not delay flush of dirty metadata */ 425 #define CEPH_I_NOFLUSH 16 /* do not flush dirty caps */ 426 427 static inline void __ceph_dir_set_complete(struct ceph_inode_info *ci, 428 int release_count) 429 { 430 atomic_set(&ci->i_complete_count, release_count); 431 } 432 433 static inline void __ceph_dir_clear_complete(struct ceph_inode_info *ci) 434 { 435 atomic_inc(&ci->i_release_count); 436 } 437 438 static inline bool __ceph_dir_is_complete(struct ceph_inode_info *ci) 439 { 440 return atomic_read(&ci->i_complete_count) == 441 atomic_read(&ci->i_release_count); 442 } 443 444 static inline void ceph_dir_clear_complete(struct inode *inode) 445 { 446 __ceph_dir_clear_complete(ceph_inode(inode)); 447 } 448 449 static inline bool ceph_dir_is_complete(struct inode *inode) 450 { 451 return __ceph_dir_is_complete(ceph_inode(inode)); 452 } 453 454 455 /* find a specific frag @f */ 456 extern struct ceph_inode_frag *__ceph_find_frag(struct ceph_inode_info *ci, 457 u32 f); 458 459 /* 460 * choose fragment for value @v. copy frag content to pfrag, if leaf 461 * exists 462 */ 463 extern u32 ceph_choose_frag(struct ceph_inode_info *ci, u32 v, 464 struct ceph_inode_frag *pfrag, 465 int *found); 466 467 static inline struct ceph_dentry_info *ceph_dentry(struct dentry *dentry) 468 { 469 return (struct ceph_dentry_info *)dentry->d_fsdata; 470 } 471 472 static inline loff_t ceph_make_fpos(unsigned frag, unsigned off) 473 { 474 return ((loff_t)frag << 32) | (loff_t)off; 475 } 476 477 /* 478 * caps helpers 479 */ 480 static inline bool __ceph_is_any_real_caps(struct ceph_inode_info *ci) 481 { 482 return !RB_EMPTY_ROOT(&ci->i_caps); 483 } 484 485 extern int __ceph_caps_issued(struct ceph_inode_info *ci, int *implemented); 486 extern int __ceph_caps_issued_mask(struct ceph_inode_info *ci, int mask, int t); 487 extern int __ceph_caps_issued_other(struct ceph_inode_info *ci, 488 struct ceph_cap *cap); 489 490 static inline int ceph_caps_issued(struct ceph_inode_info *ci) 491 { 492 int issued; 493 spin_lock(&ci->i_ceph_lock); 494 issued = __ceph_caps_issued(ci, NULL); 495 spin_unlock(&ci->i_ceph_lock); 496 return issued; 497 } 498 499 static inline int ceph_caps_issued_mask(struct ceph_inode_info *ci, int mask, 500 int touch) 501 { 502 int r; 503 spin_lock(&ci->i_ceph_lock); 504 r = __ceph_caps_issued_mask(ci, mask, touch); 505 spin_unlock(&ci->i_ceph_lock); 506 return r; 507 } 508 509 static inline int __ceph_caps_dirty(struct ceph_inode_info *ci) 510 { 511 return ci->i_dirty_caps | ci->i_flushing_caps; 512 } 513 extern int __ceph_mark_dirty_caps(struct ceph_inode_info *ci, int mask); 514 515 extern int ceph_caps_revoking(struct ceph_inode_info *ci, int mask); 516 extern int __ceph_caps_used(struct ceph_inode_info *ci); 517 518 extern int __ceph_caps_file_wanted(struct ceph_inode_info *ci); 519 520 /* 521 * wanted, by virtue of open file modes AND cap refs (buffered/cached data) 522 */ 523 static inline int __ceph_caps_wanted(struct ceph_inode_info *ci) 524 { 525 int w = __ceph_caps_file_wanted(ci) | __ceph_caps_used(ci); 526 if (w & CEPH_CAP_FILE_BUFFER) 527 w |= CEPH_CAP_FILE_EXCL; /* we want EXCL if dirty data */ 528 return w; 529 } 530 531 /* what the mds thinks we want */ 532 extern int __ceph_caps_mds_wanted(struct ceph_inode_info *ci); 533 534 extern void ceph_caps_init(struct ceph_mds_client *mdsc); 535 extern void ceph_caps_finalize(struct ceph_mds_client *mdsc); 536 extern void ceph_adjust_min_caps(struct ceph_mds_client *mdsc, int delta); 537 extern int ceph_reserve_caps(struct ceph_mds_client *mdsc, 538 struct ceph_cap_reservation *ctx, int need); 539 extern int ceph_unreserve_caps(struct ceph_mds_client *mdsc, 540 struct ceph_cap_reservation *ctx); 541 extern void ceph_reservation_status(struct ceph_fs_client *client, 542 int *total, int *avail, int *used, 543 int *reserved, int *min); 544 545 546 547 /* 548 * we keep buffered readdir results attached to file->private_data 549 */ 550 #define CEPH_F_SYNC 1 551 #define CEPH_F_ATEND 2 552 553 struct ceph_file_info { 554 short fmode; /* initialized on open */ 555 short flags; /* CEPH_F_* */ 556 557 /* readdir: position within the dir */ 558 u32 frag; 559 struct ceph_mds_request *last_readdir; 560 561 /* readdir: position within a frag */ 562 unsigned offset; /* offset of last chunk, adjusted for . and .. */ 563 u64 next_offset; /* offset of next chunk (last_name's + 1) */ 564 char *last_name; /* last entry in previous chunk */ 565 struct dentry *dentry; /* next dentry (for dcache readdir) */ 566 int dir_release_count; 567 568 /* used for -o dirstat read() on directory thing */ 569 char *dir_info; 570 int dir_info_len; 571 }; 572 573 574 575 /* 576 * A "snap realm" describes a subset of the file hierarchy sharing 577 * the same set of snapshots that apply to it. The realms themselves 578 * are organized into a hierarchy, such that children inherit (some of) 579 * the snapshots of their parents. 580 * 581 * All inodes within the realm that have capabilities are linked into a 582 * per-realm list. 583 */ 584 struct ceph_snap_realm { 585 u64 ino; 586 atomic_t nref; 587 struct rb_node node; 588 589 u64 created, seq; 590 u64 parent_ino; 591 u64 parent_since; /* snapid when our current parent became so */ 592 593 u64 *prior_parent_snaps; /* snaps inherited from any parents we */ 594 u32 num_prior_parent_snaps; /* had prior to parent_since */ 595 u64 *snaps; /* snaps specific to this realm */ 596 u32 num_snaps; 597 598 struct ceph_snap_realm *parent; 599 struct list_head children; /* list of child realms */ 600 struct list_head child_item; 601 602 struct list_head empty_item; /* if i have ref==0 */ 603 604 struct list_head dirty_item; /* if realm needs new context */ 605 606 /* the current set of snaps for this realm */ 607 struct ceph_snap_context *cached_context; 608 609 struct list_head inodes_with_caps; 610 spinlock_t inodes_with_caps_lock; 611 }; 612 613 static inline int default_congestion_kb(void) 614 { 615 int congestion_kb; 616 617 /* 618 * Copied from NFS 619 * 620 * congestion size, scale with available memory. 621 * 622 * 64MB: 8192k 623 * 128MB: 11585k 624 * 256MB: 16384k 625 * 512MB: 23170k 626 * 1GB: 32768k 627 * 2GB: 46340k 628 * 4GB: 65536k 629 * 8GB: 92681k 630 * 16GB: 131072k 631 * 632 * This allows larger machines to have larger/more transfers. 633 * Limit the default to 256M 634 */ 635 congestion_kb = (16*int_sqrt(totalram_pages)) << (PAGE_SHIFT-10); 636 if (congestion_kb > 256*1024) 637 congestion_kb = 256*1024; 638 639 return congestion_kb; 640 } 641 642 643 644 /* snap.c */ 645 struct ceph_snap_realm *ceph_lookup_snap_realm(struct ceph_mds_client *mdsc, 646 u64 ino); 647 extern void ceph_get_snap_realm(struct ceph_mds_client *mdsc, 648 struct ceph_snap_realm *realm); 649 extern void ceph_put_snap_realm(struct ceph_mds_client *mdsc, 650 struct ceph_snap_realm *realm); 651 extern int ceph_update_snap_trace(struct ceph_mds_client *m, 652 void *p, void *e, bool deletion); 653 extern void ceph_handle_snap(struct ceph_mds_client *mdsc, 654 struct ceph_mds_session *session, 655 struct ceph_msg *msg); 656 extern void ceph_queue_cap_snap(struct ceph_inode_info *ci); 657 extern int __ceph_finish_cap_snap(struct ceph_inode_info *ci, 658 struct ceph_cap_snap *capsnap); 659 extern void ceph_cleanup_empty_realms(struct ceph_mds_client *mdsc); 660 661 /* 662 * a cap_snap is "pending" if it is still awaiting an in-progress 663 * sync write (that may/may not still update size, mtime, etc.). 664 */ 665 static inline bool __ceph_have_pending_cap_snap(struct ceph_inode_info *ci) 666 { 667 return !list_empty(&ci->i_cap_snaps) && 668 list_entry(ci->i_cap_snaps.prev, struct ceph_cap_snap, 669 ci_item)->writing; 670 } 671 672 /* inode.c */ 673 extern const struct inode_operations ceph_file_iops; 674 675 extern struct inode *ceph_alloc_inode(struct super_block *sb); 676 extern void ceph_destroy_inode(struct inode *inode); 677 678 extern struct inode *ceph_get_inode(struct super_block *sb, 679 struct ceph_vino vino); 680 extern struct inode *ceph_get_snapdir(struct inode *parent); 681 extern int ceph_fill_file_size(struct inode *inode, int issued, 682 u32 truncate_seq, u64 truncate_size, u64 size); 683 extern void ceph_fill_file_time(struct inode *inode, int issued, 684 u64 time_warp_seq, struct timespec *ctime, 685 struct timespec *mtime, struct timespec *atime); 686 extern int ceph_fill_trace(struct super_block *sb, 687 struct ceph_mds_request *req, 688 struct ceph_mds_session *session); 689 extern int ceph_readdir_prepopulate(struct ceph_mds_request *req, 690 struct ceph_mds_session *session); 691 692 extern int ceph_inode_holds_cap(struct inode *inode, int mask); 693 694 extern int ceph_inode_set_size(struct inode *inode, loff_t size); 695 extern void __ceph_do_pending_vmtruncate(struct inode *inode, bool needlock); 696 extern void ceph_queue_vmtruncate(struct inode *inode); 697 698 extern void ceph_queue_invalidate(struct inode *inode); 699 extern void ceph_queue_writeback(struct inode *inode); 700 701 extern int ceph_do_getattr(struct inode *inode, int mask); 702 extern int ceph_permission(struct inode *inode, int mask); 703 extern int ceph_setattr(struct dentry *dentry, struct iattr *attr); 704 extern int ceph_getattr(struct vfsmount *mnt, struct dentry *dentry, 705 struct kstat *stat); 706 707 /* xattr.c */ 708 extern int ceph_setxattr(struct dentry *, const char *, const void *, 709 size_t, int); 710 extern ssize_t ceph_getxattr(struct dentry *, const char *, void *, size_t); 711 extern ssize_t ceph_listxattr(struct dentry *, char *, size_t); 712 extern int ceph_removexattr(struct dentry *, const char *); 713 extern void __ceph_build_xattrs_blob(struct ceph_inode_info *ci); 714 extern void __ceph_destroy_xattrs(struct ceph_inode_info *ci); 715 extern void __init ceph_xattr_init(void); 716 extern void ceph_xattr_exit(void); 717 718 /* caps.c */ 719 extern const char *ceph_cap_string(int c); 720 extern void ceph_handle_caps(struct ceph_mds_session *session, 721 struct ceph_msg *msg); 722 extern int ceph_add_cap(struct inode *inode, 723 struct ceph_mds_session *session, u64 cap_id, 724 int fmode, unsigned issued, unsigned wanted, 725 unsigned cap, unsigned seq, u64 realmino, int flags, 726 struct ceph_cap_reservation *caps_reservation); 727 extern void __ceph_remove_cap(struct ceph_cap *cap); 728 static inline void ceph_remove_cap(struct ceph_cap *cap) 729 { 730 spin_lock(&cap->ci->i_ceph_lock); 731 __ceph_remove_cap(cap); 732 spin_unlock(&cap->ci->i_ceph_lock); 733 } 734 extern void ceph_put_cap(struct ceph_mds_client *mdsc, 735 struct ceph_cap *cap); 736 737 extern void __queue_cap_release(struct ceph_mds_session *session, u64 ino, 738 u64 cap_id, u32 migrate_seq, u32 issue_seq); 739 extern void ceph_queue_caps_release(struct inode *inode); 740 extern int ceph_write_inode(struct inode *inode, struct writeback_control *wbc); 741 extern int ceph_fsync(struct file *file, loff_t start, loff_t end, 742 int datasync); 743 extern void ceph_kick_flushing_caps(struct ceph_mds_client *mdsc, 744 struct ceph_mds_session *session); 745 extern struct ceph_cap *ceph_get_cap_for_mds(struct ceph_inode_info *ci, 746 int mds); 747 extern int ceph_get_cap_mds(struct inode *inode); 748 extern void ceph_get_cap_refs(struct ceph_inode_info *ci, int caps); 749 extern void ceph_put_cap_refs(struct ceph_inode_info *ci, int had); 750 extern void ceph_put_wrbuffer_cap_refs(struct ceph_inode_info *ci, int nr, 751 struct ceph_snap_context *snapc); 752 extern void __ceph_flush_snaps(struct ceph_inode_info *ci, 753 struct ceph_mds_session **psession, 754 int again); 755 extern void ceph_check_caps(struct ceph_inode_info *ci, int flags, 756 struct ceph_mds_session *session); 757 extern void ceph_check_delayed_caps(struct ceph_mds_client *mdsc); 758 extern void ceph_flush_dirty_caps(struct ceph_mds_client *mdsc); 759 760 extern int ceph_encode_inode_release(void **p, struct inode *inode, 761 int mds, int drop, int unless, int force); 762 extern int ceph_encode_dentry_release(void **p, struct dentry *dn, 763 int mds, int drop, int unless); 764 765 extern int ceph_get_caps(struct ceph_inode_info *ci, int need, int want, 766 int *got, loff_t endoff); 767 768 /* for counting open files by mode */ 769 static inline void __ceph_get_fmode(struct ceph_inode_info *ci, int mode) 770 { 771 ci->i_nr_by_mode[mode]++; 772 } 773 extern void ceph_put_fmode(struct ceph_inode_info *ci, int mode); 774 775 /* addr.c */ 776 extern const struct address_space_operations ceph_aops; 777 extern int ceph_mmap(struct file *file, struct vm_area_struct *vma); 778 779 /* file.c */ 780 extern const struct file_operations ceph_file_fops; 781 extern const struct address_space_operations ceph_aops; 782 783 extern int ceph_open(struct inode *inode, struct file *file); 784 extern int ceph_atomic_open(struct inode *dir, struct dentry *dentry, 785 struct file *file, unsigned flags, umode_t mode, 786 int *opened); 787 extern int ceph_release(struct inode *inode, struct file *filp); 788 789 /* dir.c */ 790 extern const struct file_operations ceph_dir_fops; 791 extern const struct inode_operations ceph_dir_iops; 792 extern const struct dentry_operations ceph_dentry_ops, ceph_snap_dentry_ops, 793 ceph_snapdir_dentry_ops; 794 795 extern int ceph_handle_notrace_create(struct inode *dir, struct dentry *dentry); 796 extern int ceph_handle_snapdir(struct ceph_mds_request *req, 797 struct dentry *dentry, int err); 798 extern struct dentry *ceph_finish_lookup(struct ceph_mds_request *req, 799 struct dentry *dentry, int err); 800 801 extern void ceph_dentry_lru_add(struct dentry *dn); 802 extern void ceph_dentry_lru_touch(struct dentry *dn); 803 extern void ceph_dentry_lru_del(struct dentry *dn); 804 extern void ceph_invalidate_dentry_lease(struct dentry *dentry); 805 extern unsigned ceph_dentry_hash(struct inode *dir, struct dentry *dn); 806 extern struct inode *ceph_get_dentry_parent_inode(struct dentry *dentry); 807 808 /* 809 * our d_ops vary depending on whether the inode is live, 810 * snapshotted (read-only), or a virtual ".snap" directory. 811 */ 812 int ceph_init_dentry(struct dentry *dentry); 813 814 815 /* ioctl.c */ 816 extern long ceph_ioctl(struct file *file, unsigned int cmd, unsigned long arg); 817 818 /* export.c */ 819 extern const struct export_operations ceph_export_ops; 820 821 /* locks.c */ 822 extern int ceph_lock(struct file *file, int cmd, struct file_lock *fl); 823 extern int ceph_flock(struct file *file, int cmd, struct file_lock *fl); 824 extern void ceph_count_locks(struct inode *inode, int *p_num, int *f_num); 825 extern int ceph_encode_locks(struct inode *i, struct ceph_pagelist *p, 826 int p_locks, int f_locks); 827 extern int lock_to_ceph_filelock(struct file_lock *fl, struct ceph_filelock *c); 828 829 /* debugfs.c */ 830 extern int ceph_fs_debugfs_init(struct ceph_fs_client *client); 831 extern void ceph_fs_debugfs_cleanup(struct ceph_fs_client *client); 832 833 #endif /* _FS_CEPH_SUPER_H */ 834