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