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 20 /* 1 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 32 #define CEPH_MOUNT_OPT_DEFAULT (CEPH_MOUNT_OPT_RBYTES) 33 34 #define ceph_set_mount_opt(fsc, opt) \ 35 (fsc)->mount_options->flags |= CEPH_MOUNT_OPT_##opt; 36 #define ceph_test_mount_opt(fsc, opt) \ 37 (!!((fsc)->mount_options->flags & CEPH_MOUNT_OPT_##opt)) 38 39 #define CEPH_RSIZE_DEFAULT 0 /* max read size */ 40 #define CEPH_RASIZE_DEFAULT (8192*1024) /* readahead */ 41 #define CEPH_MAX_READDIR_DEFAULT 1024 42 #define CEPH_MAX_READDIR_BYTES_DEFAULT (512*1024) 43 #define CEPH_SNAPDIRNAME_DEFAULT ".snap" 44 45 struct ceph_mount_options { 46 int flags; 47 int sb_flags; 48 49 int wsize; /* max write size */ 50 int rsize; /* max read size */ 51 int rasize; /* max readahead */ 52 int congestion_kb; /* max writeback in flight */ 53 int caps_wanted_delay_min, caps_wanted_delay_max; 54 int cap_release_safety; 55 int max_readdir; /* max readdir result (entires) */ 56 int max_readdir_bytes; /* max readdir result (bytes) */ 57 58 /* 59 * everything above this point can be memcmp'd; everything below 60 * is handled in compare_mount_options() 61 */ 62 63 char *snapdir_name; /* default ".snap" */ 64 }; 65 66 struct ceph_fs_client { 67 struct super_block *sb; 68 69 struct ceph_mount_options *mount_options; 70 struct ceph_client *client; 71 72 unsigned long mount_state; 73 int min_caps; /* min caps i added */ 74 75 struct ceph_mds_client *mdsc; 76 77 /* writeback */ 78 mempool_t *wb_pagevec_pool; 79 struct workqueue_struct *wb_wq; 80 struct workqueue_struct *pg_inv_wq; 81 struct workqueue_struct *trunc_wq; 82 atomic_long_t writeback_count; 83 84 struct backing_dev_info backing_dev_info; 85 86 #ifdef CONFIG_DEBUG_FS 87 struct dentry *debugfs_dentry_lru, *debugfs_caps; 88 struct dentry *debugfs_congestion_kb; 89 struct dentry *debugfs_bdi; 90 struct dentry *debugfs_mdsc, *debugfs_mdsmap; 91 #endif 92 }; 93 94 95 /* 96 * File i/o capability. This tracks shared state with the metadata 97 * server that allows us to cache or writeback attributes or to read 98 * and write data. For any given inode, we should have one or more 99 * capabilities, one issued by each metadata server, and our 100 * cumulative access is the OR of all issued capabilities. 101 * 102 * Each cap is referenced by the inode's i_caps rbtree and by per-mds 103 * session capability lists. 104 */ 105 struct ceph_cap { 106 struct ceph_inode_info *ci; 107 struct rb_node ci_node; /* per-ci cap tree */ 108 struct ceph_mds_session *session; 109 struct list_head session_caps; /* per-session caplist */ 110 int mds; 111 u64 cap_id; /* unique cap id (mds provided) */ 112 int issued; /* latest, from the mds */ 113 int implemented; /* implemented superset of issued (for revocation) */ 114 int mds_wanted; 115 u32 seq, issue_seq, mseq; 116 u32 cap_gen; /* active/stale cycle */ 117 unsigned long last_used; 118 struct list_head caps_item; 119 }; 120 121 #define CHECK_CAPS_NODELAY 1 /* do not delay any further */ 122 #define CHECK_CAPS_AUTHONLY 2 /* only check auth cap */ 123 #define CHECK_CAPS_FLUSH 4 /* flush any dirty caps */ 124 125 /* 126 * Snapped cap state that is pending flush to mds. When a snapshot occurs, 127 * we first complete any in-process sync writes and writeback any dirty 128 * data before flushing the snapped state (tracked here) back to the MDS. 129 */ 130 struct ceph_cap_snap { 131 atomic_t nref; 132 struct ceph_inode_info *ci; 133 struct list_head ci_item, flushing_item; 134 135 u64 follows, flush_tid; 136 int issued, dirty; 137 struct ceph_snap_context *context; 138 139 mode_t mode; 140 uid_t uid; 141 gid_t gid; 142 143 struct ceph_buffer *xattr_blob; 144 u64 xattr_version; 145 146 u64 size; 147 struct timespec mtime, atime, ctime; 148 u64 time_warp_seq; 149 int writing; /* a sync write is still in progress */ 150 int dirty_pages; /* dirty pages awaiting writeback */ 151 }; 152 153 static inline void ceph_put_cap_snap(struct ceph_cap_snap *capsnap) 154 { 155 if (atomic_dec_and_test(&capsnap->nref)) { 156 if (capsnap->xattr_blob) 157 ceph_buffer_put(capsnap->xattr_blob); 158 kfree(capsnap); 159 } 160 } 161 162 /* 163 * The frag tree describes how a directory is fragmented, potentially across 164 * multiple metadata servers. It is also used to indicate points where 165 * metadata authority is delegated, and whether/where metadata is replicated. 166 * 167 * A _leaf_ frag will be present in the i_fragtree IFF there is 168 * delegation info. That is, if mds >= 0 || ndist > 0. 169 */ 170 #define CEPH_MAX_DIRFRAG_REP 4 171 172 struct ceph_inode_frag { 173 struct rb_node node; 174 175 /* fragtree state */ 176 u32 frag; 177 int split_by; /* i.e. 2^(split_by) children */ 178 179 /* delegation and replication info */ 180 int mds; /* -1 if same authority as parent */ 181 int ndist; /* >0 if replicated */ 182 int dist[CEPH_MAX_DIRFRAG_REP]; 183 }; 184 185 /* 186 * We cache inode xattrs as an encoded blob until they are first used, 187 * at which point we parse them into an rbtree. 188 */ 189 struct ceph_inode_xattr { 190 struct rb_node node; 191 192 const char *name; 193 int name_len; 194 const char *val; 195 int val_len; 196 int dirty; 197 198 int should_free_name; 199 int should_free_val; 200 }; 201 202 /* 203 * Ceph dentry state 204 */ 205 struct ceph_dentry_info { 206 struct ceph_mds_session *lease_session; 207 u32 lease_gen, lease_shared_gen; 208 u32 lease_seq; 209 unsigned long lease_renew_after, lease_renew_from; 210 struct list_head lru; 211 struct dentry *dentry; 212 u64 time; 213 u64 offset; 214 }; 215 216 struct ceph_inode_xattrs_info { 217 /* 218 * (still encoded) xattr blob. we avoid the overhead of parsing 219 * this until someone actually calls getxattr, etc. 220 * 221 * blob->vec.iov_len == 4 implies there are no xattrs; blob == 222 * NULL means we don't know. 223 */ 224 struct ceph_buffer *blob, *prealloc_blob; 225 226 struct rb_root index; 227 bool dirty; 228 int count; 229 int names_size; 230 int vals_size; 231 u64 version, index_version; 232 }; 233 234 /* 235 * Ceph inode. 236 */ 237 struct ceph_inode_info { 238 struct ceph_vino i_vino; /* ceph ino + snap */ 239 240 u64 i_version; 241 u32 i_time_warp_seq; 242 243 unsigned i_ceph_flags; 244 unsigned long i_release_count; 245 246 struct ceph_dir_layout i_dir_layout; 247 struct ceph_file_layout i_layout; 248 char *i_symlink; 249 250 /* for dirs */ 251 struct timespec i_rctime; 252 u64 i_rbytes, i_rfiles, i_rsubdirs; 253 u64 i_files, i_subdirs; 254 u64 i_max_offset; /* largest readdir offset, set with I_COMPLETE */ 255 256 struct rb_root i_fragtree; 257 struct mutex i_fragtree_mutex; 258 259 struct ceph_inode_xattrs_info i_xattrs; 260 261 /* capabilities. protected _both_ by i_lock and cap->session's 262 * s_mutex. */ 263 struct rb_root i_caps; /* cap list */ 264 struct ceph_cap *i_auth_cap; /* authoritative cap, if any */ 265 unsigned i_dirty_caps, i_flushing_caps; /* mask of dirtied fields */ 266 struct list_head i_dirty_item, i_flushing_item; 267 u64 i_cap_flush_seq; 268 /* we need to track cap writeback on a per-cap-bit basis, to allow 269 * overlapping, pipelined cap flushes to the mds. we can probably 270 * reduce the tid to 8 bits if we're concerned about inode size. */ 271 u16 i_cap_flush_last_tid, i_cap_flush_tid[CEPH_CAP_BITS]; 272 wait_queue_head_t i_cap_wq; /* threads waiting on a capability */ 273 unsigned long i_hold_caps_min; /* jiffies */ 274 unsigned long i_hold_caps_max; /* jiffies */ 275 struct list_head i_cap_delay_list; /* for delayed cap release to mds */ 276 int i_cap_exporting_mds; /* to handle cap migration between */ 277 unsigned i_cap_exporting_mseq; /* mds's. */ 278 unsigned i_cap_exporting_issued; 279 struct ceph_cap_reservation i_cap_migration_resv; 280 struct list_head i_cap_snaps; /* snapped state pending flush to mds */ 281 struct ceph_snap_context *i_head_snapc; /* set if wr_buffer_head > 0 or 282 dirty|flushing caps */ 283 unsigned i_snap_caps; /* cap bits for snapped files */ 284 285 int i_nr_by_mode[CEPH_FILE_MODE_NUM]; /* open file counts */ 286 287 u32 i_truncate_seq; /* last truncate to smaller size */ 288 u64 i_truncate_size; /* and the size we last truncated down to */ 289 int i_truncate_pending; /* still need to call vmtruncate */ 290 291 u64 i_max_size; /* max file size authorized by mds */ 292 u64 i_reported_size; /* (max_)size reported to or requested of mds */ 293 u64 i_wanted_max_size; /* offset we'd like to write too */ 294 u64 i_requested_max_size; /* max_size we've requested */ 295 296 /* held references to caps */ 297 int i_pin_ref; 298 int i_rd_ref, i_rdcache_ref, i_wr_ref, i_wb_ref; 299 int i_wrbuffer_ref, i_wrbuffer_ref_head; 300 u32 i_shared_gen; /* increment each time we get FILE_SHARED */ 301 u32 i_rdcache_gen; /* incremented each time we get FILE_CACHE. */ 302 u32 i_rdcache_revoking; /* RDCACHE gen to async invalidate, if any */ 303 304 struct list_head i_unsafe_writes; /* uncommitted sync writes */ 305 struct list_head i_unsafe_dirops; /* uncommitted mds dir ops */ 306 spinlock_t i_unsafe_lock; 307 308 struct ceph_snap_realm *i_snap_realm; /* snap realm (if caps) */ 309 int i_snap_realm_counter; /* snap realm (if caps) */ 310 struct list_head i_snap_realm_item; 311 struct list_head i_snap_flush_item; 312 313 struct work_struct i_wb_work; /* writeback work */ 314 struct work_struct i_pg_inv_work; /* page invalidation work */ 315 316 struct work_struct i_vmtruncate_work; 317 318 struct inode vfs_inode; /* at end */ 319 }; 320 321 static inline struct ceph_inode_info *ceph_inode(struct inode *inode) 322 { 323 return container_of(inode, struct ceph_inode_info, vfs_inode); 324 } 325 326 static inline struct ceph_fs_client *ceph_inode_to_client(struct inode *inode) 327 { 328 return (struct ceph_fs_client *)inode->i_sb->s_fs_info; 329 } 330 331 static inline struct ceph_fs_client *ceph_sb_to_client(struct super_block *sb) 332 { 333 return (struct ceph_fs_client *)sb->s_fs_info; 334 } 335 336 static inline struct ceph_vino ceph_vino(struct inode *inode) 337 { 338 return ceph_inode(inode)->i_vino; 339 } 340 341 /* 342 * ino_t is <64 bits on many architectures, blech. 343 * 344 * i_ino (kernel inode) st_ino (userspace) 345 * i386 32 32 346 * x86_64+ino32 64 32 347 * x86_64 64 64 348 */ 349 static inline u32 ceph_ino_to_ino32(__u64 vino) 350 { 351 u32 ino = vino & 0xffffffff; 352 ino ^= vino >> 32; 353 if (!ino) 354 ino = 1; 355 return ino; 356 } 357 358 /* 359 * kernel i_ino value 360 */ 361 static inline ino_t ceph_vino_to_ino(struct ceph_vino vino) 362 { 363 #if BITS_PER_LONG == 32 364 return ceph_ino_to_ino32(vino.ino); 365 #else 366 return (ino_t)vino.ino; 367 #endif 368 } 369 370 /* 371 * user-visible ino (stat, filldir) 372 */ 373 #if BITS_PER_LONG == 32 374 static inline ino_t ceph_translate_ino(struct super_block *sb, ino_t ino) 375 { 376 return ino; 377 } 378 #else 379 static inline ino_t ceph_translate_ino(struct super_block *sb, ino_t ino) 380 { 381 if (ceph_test_mount_opt(ceph_sb_to_client(sb), INO32)) 382 ino = ceph_ino_to_ino32(ino); 383 return ino; 384 } 385 #endif 386 387 388 /* for printf-style formatting */ 389 #define ceph_vinop(i) ceph_inode(i)->i_vino.ino, ceph_inode(i)->i_vino.snap 390 391 static inline u64 ceph_ino(struct inode *inode) 392 { 393 return ceph_inode(inode)->i_vino.ino; 394 } 395 static inline u64 ceph_snap(struct inode *inode) 396 { 397 return ceph_inode(inode)->i_vino.snap; 398 } 399 400 static inline int ceph_ino_compare(struct inode *inode, void *data) 401 { 402 struct ceph_vino *pvino = (struct ceph_vino *)data; 403 struct ceph_inode_info *ci = ceph_inode(inode); 404 return ci->i_vino.ino == pvino->ino && 405 ci->i_vino.snap == pvino->snap; 406 } 407 408 static inline struct inode *ceph_find_inode(struct super_block *sb, 409 struct ceph_vino vino) 410 { 411 ino_t t = ceph_vino_to_ino(vino); 412 return ilookup5(sb, t, ceph_ino_compare, &vino); 413 } 414 415 416 /* 417 * Ceph inode. 418 */ 419 #define CEPH_I_COMPLETE 1 /* we have complete directory cached */ 420 #define CEPH_I_NODELAY 4 /* do not delay cap release */ 421 #define CEPH_I_FLUSH 8 /* do not delay flush of dirty metadata */ 422 #define CEPH_I_NOFLUSH 16 /* do not flush dirty caps */ 423 424 static inline void ceph_i_clear(struct inode *inode, unsigned mask) 425 { 426 struct ceph_inode_info *ci = ceph_inode(inode); 427 428 spin_lock(&inode->i_lock); 429 ci->i_ceph_flags &= ~mask; 430 spin_unlock(&inode->i_lock); 431 } 432 433 static inline void ceph_i_set(struct inode *inode, unsigned mask) 434 { 435 struct ceph_inode_info *ci = ceph_inode(inode); 436 437 spin_lock(&inode->i_lock); 438 ci->i_ceph_flags |= mask; 439 spin_unlock(&inode->i_lock); 440 } 441 442 static inline bool ceph_i_test(struct inode *inode, unsigned mask) 443 { 444 struct ceph_inode_info *ci = ceph_inode(inode); 445 bool r; 446 447 spin_lock(&inode->i_lock); 448 r = (ci->i_ceph_flags & mask) == mask; 449 spin_unlock(&inode->i_lock); 450 return r; 451 } 452 453 454 /* find a specific frag @f */ 455 extern struct ceph_inode_frag *__ceph_find_frag(struct ceph_inode_info *ci, 456 u32 f); 457 458 /* 459 * choose fragment for value @v. copy frag content to pfrag, if leaf 460 * exists 461 */ 462 extern u32 ceph_choose_frag(struct ceph_inode_info *ci, u32 v, 463 struct ceph_inode_frag *pfrag, 464 int *found); 465 466 static inline struct ceph_dentry_info *ceph_dentry(struct dentry *dentry) 467 { 468 return (struct ceph_dentry_info *)dentry->d_fsdata; 469 } 470 471 static inline loff_t ceph_make_fpos(unsigned frag, unsigned off) 472 { 473 return ((loff_t)frag << 32) | (loff_t)off; 474 } 475 476 /* 477 * caps helpers 478 */ 479 static inline bool __ceph_is_any_real_caps(struct ceph_inode_info *ci) 480 { 481 return !RB_EMPTY_ROOT(&ci->i_caps); 482 } 483 484 extern int __ceph_caps_issued(struct ceph_inode_info *ci, int *implemented); 485 extern int __ceph_caps_issued_mask(struct ceph_inode_info *ci, int mask, int t); 486 extern int __ceph_caps_issued_other(struct ceph_inode_info *ci, 487 struct ceph_cap *cap); 488 489 static inline int ceph_caps_issued(struct ceph_inode_info *ci) 490 { 491 int issued; 492 spin_lock(&ci->vfs_inode.i_lock); 493 issued = __ceph_caps_issued(ci, NULL); 494 spin_unlock(&ci->vfs_inode.i_lock); 495 return issued; 496 } 497 498 static inline int ceph_caps_issued_mask(struct ceph_inode_info *ci, int mask, 499 int touch) 500 { 501 int r; 502 spin_lock(&ci->vfs_inode.i_lock); 503 r = __ceph_caps_issued_mask(ci, mask, touch); 504 spin_unlock(&ci->vfs_inode.i_lock); 505 return r; 506 } 507 508 static inline int __ceph_caps_dirty(struct ceph_inode_info *ci) 509 { 510 return ci->i_dirty_caps | ci->i_flushing_caps; 511 } 512 extern int __ceph_mark_dirty_caps(struct ceph_inode_info *ci, int mask); 513 514 extern int ceph_caps_revoking(struct ceph_inode_info *ci, int mask); 515 extern int __ceph_caps_used(struct ceph_inode_info *ci); 516 517 extern int __ceph_caps_file_wanted(struct ceph_inode_info *ci); 518 519 /* 520 * wanted, by virtue of open file modes AND cap refs (buffered/cached data) 521 */ 522 static inline int __ceph_caps_wanted(struct ceph_inode_info *ci) 523 { 524 int w = __ceph_caps_file_wanted(ci) | __ceph_caps_used(ci); 525 if (w & CEPH_CAP_FILE_BUFFER) 526 w |= CEPH_CAP_FILE_EXCL; /* we want EXCL if dirty data */ 527 return w; 528 } 529 530 /* what the mds thinks we want */ 531 extern int __ceph_caps_mds_wanted(struct ceph_inode_info *ci); 532 533 extern void ceph_caps_init(struct ceph_mds_client *mdsc); 534 extern void ceph_caps_finalize(struct ceph_mds_client *mdsc); 535 extern void ceph_adjust_min_caps(struct ceph_mds_client *mdsc, int delta); 536 extern int ceph_reserve_caps(struct ceph_mds_client *mdsc, 537 struct ceph_cap_reservation *ctx, int need); 538 extern int ceph_unreserve_caps(struct ceph_mds_client *mdsc, 539 struct ceph_cap_reservation *ctx); 540 extern void ceph_reservation_status(struct ceph_fs_client *client, 541 int *total, int *avail, int *used, 542 int *reserved, int *min); 543 544 545 546 /* 547 * we keep buffered readdir results attached to file->private_data 548 */ 549 #define CEPH_F_SYNC 1 550 #define CEPH_F_ATEND 2 551 552 struct ceph_file_info { 553 short fmode; /* initialized on open */ 554 short flags; /* CEPH_F_* */ 555 556 /* readdir: position within the dir */ 557 u32 frag; 558 struct ceph_mds_request *last_readdir; 559 560 /* readdir: position within a frag */ 561 unsigned offset; /* offset of last chunk, adjusted for . and .. */ 562 u64 next_offset; /* offset of next chunk (last_name's + 1) */ 563 char *last_name; /* last entry in previous chunk */ 564 struct dentry *dentry; /* next dentry (for dcache readdir) */ 565 unsigned long dir_release_count; 566 567 /* used for -o dirstat read() on directory thing */ 568 char *dir_info; 569 int dir_info_len; 570 }; 571 572 573 574 /* 575 * A "snap realm" describes a subset of the file hierarchy sharing 576 * the same set of snapshots that apply to it. The realms themselves 577 * are organized into a hierarchy, such that children inherit (some of) 578 * the snapshots of their parents. 579 * 580 * All inodes within the realm that have capabilities are linked into a 581 * per-realm list. 582 */ 583 struct ceph_snap_realm { 584 u64 ino; 585 atomic_t nref; 586 struct rb_node node; 587 588 u64 created, seq; 589 u64 parent_ino; 590 u64 parent_since; /* snapid when our current parent became so */ 591 592 u64 *prior_parent_snaps; /* snaps inherited from any parents we */ 593 int num_prior_parent_snaps; /* had prior to parent_since */ 594 u64 *snaps; /* snaps specific to this realm */ 595 int num_snaps; 596 597 struct ceph_snap_realm *parent; 598 struct list_head children; /* list of child realms */ 599 struct list_head child_item; 600 601 struct list_head empty_item; /* if i have ref==0 */ 602 603 struct list_head dirty_item; /* if realm needs new context */ 604 605 /* the current set of snaps for this realm */ 606 struct ceph_snap_context *cached_context; 607 608 struct list_head inodes_with_caps; 609 spinlock_t inodes_with_caps_lock; 610 }; 611 612 static inline int default_congestion_kb(void) 613 { 614 int congestion_kb; 615 616 /* 617 * Copied from NFS 618 * 619 * congestion size, scale with available memory. 620 * 621 * 64MB: 8192k 622 * 128MB: 11585k 623 * 256MB: 16384k 624 * 512MB: 23170k 625 * 1GB: 32768k 626 * 2GB: 46340k 627 * 4GB: 65536k 628 * 8GB: 92681k 629 * 16GB: 131072k 630 * 631 * This allows larger machines to have larger/more transfers. 632 * Limit the default to 256M 633 */ 634 congestion_kb = (16*int_sqrt(totalram_pages)) << (PAGE_SHIFT-10); 635 if (congestion_kb > 256*1024) 636 congestion_kb = 256*1024; 637 638 return congestion_kb; 639 } 640 641 642 643 /* snap.c */ 644 struct ceph_snap_realm *ceph_lookup_snap_realm(struct ceph_mds_client *mdsc, 645 u64 ino); 646 extern void ceph_get_snap_realm(struct ceph_mds_client *mdsc, 647 struct ceph_snap_realm *realm); 648 extern void ceph_put_snap_realm(struct ceph_mds_client *mdsc, 649 struct ceph_snap_realm *realm); 650 extern int ceph_update_snap_trace(struct ceph_mds_client *m, 651 void *p, void *e, bool deletion); 652 extern void ceph_handle_snap(struct ceph_mds_client *mdsc, 653 struct ceph_mds_session *session, 654 struct ceph_msg *msg); 655 extern void ceph_queue_cap_snap(struct ceph_inode_info *ci); 656 extern int __ceph_finish_cap_snap(struct ceph_inode_info *ci, 657 struct ceph_cap_snap *capsnap); 658 extern void ceph_cleanup_empty_realms(struct ceph_mds_client *mdsc); 659 660 /* 661 * a cap_snap is "pending" if it is still awaiting an in-progress 662 * sync write (that may/may not still update size, mtime, etc.). 663 */ 664 static inline bool __ceph_have_pending_cap_snap(struct ceph_inode_info *ci) 665 { 666 return !list_empty(&ci->i_cap_snaps) && 667 list_entry(ci->i_cap_snaps.prev, struct ceph_cap_snap, 668 ci_item)->writing; 669 } 670 671 /* inode.c */ 672 extern const struct inode_operations ceph_file_iops; 673 674 extern struct inode *ceph_alloc_inode(struct super_block *sb); 675 extern void ceph_destroy_inode(struct inode *inode); 676 677 extern struct inode *ceph_get_inode(struct super_block *sb, 678 struct ceph_vino vino); 679 extern struct inode *ceph_get_snapdir(struct inode *parent); 680 extern int ceph_fill_file_size(struct inode *inode, int issued, 681 u32 truncate_seq, u64 truncate_size, u64 size); 682 extern void ceph_fill_file_time(struct inode *inode, int issued, 683 u64 time_warp_seq, struct timespec *ctime, 684 struct timespec *mtime, struct timespec *atime); 685 extern int ceph_fill_trace(struct super_block *sb, 686 struct ceph_mds_request *req, 687 struct ceph_mds_session *session); 688 extern int ceph_readdir_prepopulate(struct ceph_mds_request *req, 689 struct ceph_mds_session *session); 690 691 extern int ceph_inode_holds_cap(struct inode *inode, int mask); 692 693 extern int ceph_inode_set_size(struct inode *inode, loff_t size); 694 extern void __ceph_do_pending_vmtruncate(struct inode *inode); 695 extern void ceph_queue_vmtruncate(struct inode *inode); 696 697 extern void ceph_queue_invalidate(struct inode *inode); 698 extern void ceph_queue_writeback(struct inode *inode); 699 700 extern int ceph_do_getattr(struct inode *inode, int mask); 701 extern int ceph_permission(struct inode *inode, int mask); 702 extern int ceph_setattr(struct dentry *dentry, struct iattr *attr); 703 extern int ceph_getattr(struct vfsmount *mnt, struct dentry *dentry, 704 struct kstat *stat); 705 706 /* xattr.c */ 707 extern int ceph_setxattr(struct dentry *, const char *, const void *, 708 size_t, int); 709 extern ssize_t ceph_getxattr(struct dentry *, const char *, void *, size_t); 710 extern ssize_t ceph_listxattr(struct dentry *, char *, size_t); 711 extern int ceph_removexattr(struct dentry *, const char *); 712 extern void __ceph_build_xattrs_blob(struct ceph_inode_info *ci); 713 extern void __ceph_destroy_xattrs(struct ceph_inode_info *ci); 714 715 /* caps.c */ 716 extern const char *ceph_cap_string(int c); 717 extern void ceph_handle_caps(struct ceph_mds_session *session, 718 struct ceph_msg *msg); 719 extern int ceph_add_cap(struct inode *inode, 720 struct ceph_mds_session *session, u64 cap_id, 721 int fmode, unsigned issued, unsigned wanted, 722 unsigned cap, unsigned seq, u64 realmino, int flags, 723 struct ceph_cap_reservation *caps_reservation); 724 extern void __ceph_remove_cap(struct ceph_cap *cap); 725 static inline void ceph_remove_cap(struct ceph_cap *cap) 726 { 727 struct inode *inode = &cap->ci->vfs_inode; 728 spin_lock(&inode->i_lock); 729 __ceph_remove_cap(cap); 730 spin_unlock(&inode->i_lock); 731 } 732 extern void ceph_put_cap(struct ceph_mds_client *mdsc, 733 struct ceph_cap *cap); 734 735 extern void ceph_queue_caps_release(struct inode *inode); 736 extern int ceph_write_inode(struct inode *inode, struct writeback_control *wbc); 737 extern int ceph_fsync(struct file *file, loff_t start, loff_t end, 738 int datasync); 739 extern void ceph_kick_flushing_caps(struct ceph_mds_client *mdsc, 740 struct ceph_mds_session *session); 741 extern struct ceph_cap *ceph_get_cap_for_mds(struct ceph_inode_info *ci, 742 int mds); 743 extern int ceph_get_cap_mds(struct inode *inode); 744 extern void ceph_get_cap_refs(struct ceph_inode_info *ci, int caps); 745 extern void ceph_put_cap_refs(struct ceph_inode_info *ci, int had); 746 extern void ceph_put_wrbuffer_cap_refs(struct ceph_inode_info *ci, int nr, 747 struct ceph_snap_context *snapc); 748 extern void __ceph_flush_snaps(struct ceph_inode_info *ci, 749 struct ceph_mds_session **psession, 750 int again); 751 extern void ceph_check_caps(struct ceph_inode_info *ci, int flags, 752 struct ceph_mds_session *session); 753 extern void ceph_check_delayed_caps(struct ceph_mds_client *mdsc); 754 extern void ceph_flush_dirty_caps(struct ceph_mds_client *mdsc); 755 756 extern int ceph_encode_inode_release(void **p, struct inode *inode, 757 int mds, int drop, int unless, int force); 758 extern int ceph_encode_dentry_release(void **p, struct dentry *dn, 759 int mds, int drop, int unless); 760 761 extern int ceph_get_caps(struct ceph_inode_info *ci, int need, int want, 762 int *got, loff_t endoff); 763 764 /* for counting open files by mode */ 765 static inline void __ceph_get_fmode(struct ceph_inode_info *ci, int mode) 766 { 767 ci->i_nr_by_mode[mode]++; 768 } 769 extern void ceph_put_fmode(struct ceph_inode_info *ci, int mode); 770 771 /* addr.c */ 772 extern const struct address_space_operations ceph_aops; 773 extern int ceph_mmap(struct file *file, struct vm_area_struct *vma); 774 775 /* file.c */ 776 extern const struct file_operations ceph_file_fops; 777 extern const struct address_space_operations ceph_aops; 778 extern int ceph_copy_to_page_vector(struct page **pages, 779 const char *data, 780 loff_t off, size_t len); 781 extern int ceph_copy_from_page_vector(struct page **pages, 782 char *data, 783 loff_t off, size_t len); 784 extern struct page **ceph_alloc_page_vector(int num_pages, gfp_t flags); 785 extern int ceph_open(struct inode *inode, struct file *file); 786 extern struct dentry *ceph_lookup_open(struct inode *dir, struct dentry *dentry, 787 struct nameidata *nd, int mode, 788 int locked_dir); 789 extern int ceph_release(struct inode *inode, struct file *filp); 790 791 /* dir.c */ 792 extern const struct file_operations ceph_dir_fops; 793 extern const struct inode_operations ceph_dir_iops; 794 extern const struct dentry_operations ceph_dentry_ops, ceph_snap_dentry_ops, 795 ceph_snapdir_dentry_ops; 796 797 extern int ceph_handle_notrace_create(struct inode *dir, struct dentry *dentry); 798 extern int ceph_handle_snapdir(struct ceph_mds_request *req, 799 struct dentry *dentry, int err); 800 extern struct dentry *ceph_finish_lookup(struct ceph_mds_request *req, 801 struct dentry *dentry, int err); 802 803 extern void ceph_dentry_lru_add(struct dentry *dn); 804 extern void ceph_dentry_lru_touch(struct dentry *dn); 805 extern void ceph_dentry_lru_del(struct dentry *dn); 806 extern void ceph_invalidate_dentry_lease(struct dentry *dentry); 807 extern unsigned ceph_dentry_hash(struct inode *dir, struct dentry *dn); 808 extern struct inode *ceph_get_dentry_parent_inode(struct dentry *dentry); 809 810 /* 811 * our d_ops vary depending on whether the inode is live, 812 * snapshotted (read-only), or a virtual ".snap" directory. 813 */ 814 int ceph_init_dentry(struct dentry *dentry); 815 816 817 /* ioctl.c */ 818 extern long ceph_ioctl(struct file *file, unsigned int cmd, unsigned long arg); 819 820 /* export.c */ 821 extern const struct export_operations ceph_export_ops; 822 823 /* locks.c */ 824 extern int ceph_lock(struct file *file, int cmd, struct file_lock *fl); 825 extern int ceph_flock(struct file *file, int cmd, struct file_lock *fl); 826 extern void ceph_count_locks(struct inode *inode, int *p_num, int *f_num); 827 extern int ceph_encode_locks(struct inode *i, struct ceph_pagelist *p, 828 int p_locks, int f_locks); 829 extern int lock_to_ceph_filelock(struct file_lock *fl, struct ceph_filelock *c); 830 831 /* debugfs.c */ 832 extern int ceph_fs_debugfs_init(struct ceph_fs_client *client); 833 extern void ceph_fs_debugfs_cleanup(struct ceph_fs_client *client); 834 835 #endif /* _FS_CEPH_SUPER_H */ 836