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