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 #ifdef CONFIG_CEPH_FSCACHE 20 #include <linux/fscache.h> 21 #endif 22 23 /* f_type in struct statfs */ 24 #define CEPH_SUPER_MAGIC 0x00c36400 25 26 /* large granularity for statfs utilization stats to facilitate 27 * large volume sizes on 32-bit machines. */ 28 #define CEPH_BLOCK_SHIFT 22 /* 4 MB */ 29 #define CEPH_BLOCK (1 << CEPH_BLOCK_SHIFT) 30 31 #define CEPH_MOUNT_OPT_DIRSTAT (1<<4) /* `cat dirname` for stats */ 32 #define CEPH_MOUNT_OPT_RBYTES (1<<5) /* dir st_bytes = rbytes */ 33 #define CEPH_MOUNT_OPT_NOASYNCREADDIR (1<<7) /* no dcache readdir */ 34 #define CEPH_MOUNT_OPT_INO32 (1<<8) /* 32 bit inos */ 35 #define CEPH_MOUNT_OPT_DCACHE (1<<9) /* use dcache for readdir etc */ 36 #define CEPH_MOUNT_OPT_FSCACHE (1<<10) /* use fscache */ 37 38 #define CEPH_MOUNT_OPT_DEFAULT (CEPH_MOUNT_OPT_RBYTES) 39 40 #define ceph_set_mount_opt(fsc, opt) \ 41 (fsc)->mount_options->flags |= CEPH_MOUNT_OPT_##opt; 42 #define ceph_test_mount_opt(fsc, opt) \ 43 (!!((fsc)->mount_options->flags & CEPH_MOUNT_OPT_##opt)) 44 45 #define CEPH_RSIZE_DEFAULT 0 /* max read size */ 46 #define CEPH_RASIZE_DEFAULT (8192*1024) /* readahead */ 47 #define CEPH_MAX_READDIR_DEFAULT 1024 48 #define CEPH_MAX_READDIR_BYTES_DEFAULT (512*1024) 49 #define CEPH_SNAPDIRNAME_DEFAULT ".snap" 50 51 struct ceph_mount_options { 52 int flags; 53 int sb_flags; 54 55 int wsize; /* max write size */ 56 int rsize; /* max read size */ 57 int rasize; /* max readahead */ 58 int congestion_kb; /* max writeback in flight */ 59 int caps_wanted_delay_min, caps_wanted_delay_max; 60 int cap_release_safety; 61 int max_readdir; /* max readdir result (entires) */ 62 int max_readdir_bytes; /* max readdir result (bytes) */ 63 64 /* 65 * everything above this point can be memcmp'd; everything below 66 * is handled in compare_mount_options() 67 */ 68 69 char *snapdir_name; /* default ".snap" */ 70 }; 71 72 struct ceph_fs_client { 73 struct super_block *sb; 74 75 struct ceph_mount_options *mount_options; 76 struct ceph_client *client; 77 78 unsigned long mount_state; 79 int min_caps; /* min caps i added */ 80 81 struct ceph_mds_client *mdsc; 82 83 /* writeback */ 84 mempool_t *wb_pagevec_pool; 85 struct workqueue_struct *wb_wq; 86 struct workqueue_struct *pg_inv_wq; 87 struct workqueue_struct *trunc_wq; 88 atomic_long_t writeback_count; 89 90 struct backing_dev_info backing_dev_info; 91 92 #ifdef CONFIG_DEBUG_FS 93 struct dentry *debugfs_dentry_lru, *debugfs_caps; 94 struct dentry *debugfs_congestion_kb; 95 struct dentry *debugfs_bdi; 96 struct dentry *debugfs_mdsc, *debugfs_mdsmap; 97 #endif 98 99 #ifdef CONFIG_CEPH_FSCACHE 100 struct fscache_cookie *fscache; 101 struct workqueue_struct *revalidate_wq; 102 #endif 103 }; 104 105 106 /* 107 * File i/o capability. This tracks shared state with the metadata 108 * server that allows us to cache or writeback attributes or to read 109 * and write data. For any given inode, we should have one or more 110 * capabilities, one issued by each metadata server, and our 111 * cumulative access is the OR of all issued capabilities. 112 * 113 * Each cap is referenced by the inode's i_caps rbtree and by per-mds 114 * session capability lists. 115 */ 116 struct ceph_cap { 117 struct ceph_inode_info *ci; 118 struct rb_node ci_node; /* per-ci cap tree */ 119 struct ceph_mds_session *session; 120 struct list_head session_caps; /* per-session caplist */ 121 int mds; 122 u64 cap_id; /* unique cap id (mds provided) */ 123 int issued; /* latest, from the mds */ 124 int implemented; /* implemented superset of issued (for revocation) */ 125 int mds_wanted; 126 u32 seq, issue_seq, mseq; 127 u32 cap_gen; /* active/stale cycle */ 128 unsigned long last_used; 129 struct list_head caps_item; 130 }; 131 132 #define CHECK_CAPS_NODELAY 1 /* do not delay any further */ 133 #define CHECK_CAPS_AUTHONLY 2 /* only check auth cap */ 134 #define CHECK_CAPS_FLUSH 4 /* flush any dirty caps */ 135 136 /* 137 * Snapped cap state that is pending flush to mds. When a snapshot occurs, 138 * we first complete any in-process sync writes and writeback any dirty 139 * data before flushing the snapped state (tracked here) back to the MDS. 140 */ 141 struct ceph_cap_snap { 142 atomic_t nref; 143 struct ceph_inode_info *ci; 144 struct list_head ci_item, flushing_item; 145 146 u64 follows, flush_tid; 147 int issued, dirty; 148 struct ceph_snap_context *context; 149 150 umode_t mode; 151 kuid_t uid; 152 kgid_t gid; 153 154 struct ceph_buffer *xattr_blob; 155 u64 xattr_version; 156 157 u64 size; 158 struct timespec mtime, atime, ctime; 159 u64 time_warp_seq; 160 int writing; /* a sync write is still in progress */ 161 int dirty_pages; /* dirty pages awaiting writeback */ 162 }; 163 164 static inline void ceph_put_cap_snap(struct ceph_cap_snap *capsnap) 165 { 166 if (atomic_dec_and_test(&capsnap->nref)) { 167 if (capsnap->xattr_blob) 168 ceph_buffer_put(capsnap->xattr_blob); 169 kfree(capsnap); 170 } 171 } 172 173 /* 174 * The frag tree describes how a directory is fragmented, potentially across 175 * multiple metadata servers. It is also used to indicate points where 176 * metadata authority is delegated, and whether/where metadata is replicated. 177 * 178 * A _leaf_ frag will be present in the i_fragtree IFF there is 179 * delegation info. That is, if mds >= 0 || ndist > 0. 180 */ 181 #define CEPH_MAX_DIRFRAG_REP 4 182 183 struct ceph_inode_frag { 184 struct rb_node node; 185 186 /* fragtree state */ 187 u32 frag; 188 int split_by; /* i.e. 2^(split_by) children */ 189 190 /* delegation and replication info */ 191 int mds; /* -1 if same authority as parent */ 192 int ndist; /* >0 if replicated */ 193 int dist[CEPH_MAX_DIRFRAG_REP]; 194 }; 195 196 /* 197 * We cache inode xattrs as an encoded blob until they are first used, 198 * at which point we parse them into an rbtree. 199 */ 200 struct ceph_inode_xattr { 201 struct rb_node node; 202 203 const char *name; 204 int name_len; 205 const char *val; 206 int val_len; 207 int dirty; 208 209 int should_free_name; 210 int should_free_val; 211 }; 212 213 /* 214 * Ceph dentry state 215 */ 216 struct ceph_dentry_info { 217 struct ceph_mds_session *lease_session; 218 u32 lease_gen, lease_shared_gen; 219 u32 lease_seq; 220 unsigned long lease_renew_after, lease_renew_from; 221 struct list_head lru; 222 struct dentry *dentry; 223 u64 time; 224 u64 offset; 225 }; 226 227 struct ceph_inode_xattrs_info { 228 /* 229 * (still encoded) xattr blob. we avoid the overhead of parsing 230 * this until someone actually calls getxattr, etc. 231 * 232 * blob->vec.iov_len == 4 implies there are no xattrs; blob == 233 * NULL means we don't know. 234 */ 235 struct ceph_buffer *blob, *prealloc_blob; 236 237 struct rb_root index; 238 bool dirty; 239 int count; 240 int names_size; 241 int vals_size; 242 u64 version, index_version; 243 }; 244 245 /* 246 * Ceph inode. 247 */ 248 struct ceph_inode_info { 249 struct ceph_vino i_vino; /* ceph ino + snap */ 250 251 spinlock_t i_ceph_lock; 252 253 u64 i_version; 254 u32 i_time_warp_seq; 255 256 unsigned i_ceph_flags; 257 atomic_t i_release_count; 258 atomic_t i_complete_count; 259 260 struct ceph_dir_layout i_dir_layout; 261 struct ceph_file_layout i_layout; 262 char *i_symlink; 263 264 /* for dirs */ 265 struct timespec i_rctime; 266 u64 i_rbytes, i_rfiles, i_rsubdirs; 267 u64 i_files, i_subdirs; 268 u64 i_max_offset; /* largest readdir offset, set with complete dir */ 269 270 struct rb_root i_fragtree; 271 struct mutex i_fragtree_mutex; 272 273 struct ceph_inode_xattrs_info i_xattrs; 274 275 /* capabilities. protected _both_ by i_ceph_lock and cap->session's 276 * s_mutex. */ 277 struct rb_root i_caps; /* cap list */ 278 struct ceph_cap *i_auth_cap; /* authoritative cap, if any */ 279 unsigned i_dirty_caps, i_flushing_caps; /* mask of dirtied fields */ 280 struct list_head i_dirty_item, i_flushing_item; 281 u64 i_cap_flush_seq; 282 /* we need to track cap writeback on a per-cap-bit basis, to allow 283 * overlapping, pipelined cap flushes to the mds. we can probably 284 * reduce the tid to 8 bits if we're concerned about inode size. */ 285 u16 i_cap_flush_last_tid, i_cap_flush_tid[CEPH_CAP_BITS]; 286 wait_queue_head_t i_cap_wq; /* threads waiting on a capability */ 287 unsigned long i_hold_caps_min; /* jiffies */ 288 unsigned long i_hold_caps_max; /* jiffies */ 289 struct list_head i_cap_delay_list; /* for delayed cap release to mds */ 290 int i_cap_exporting_mds; /* to handle cap migration between */ 291 unsigned i_cap_exporting_mseq; /* mds's. */ 292 unsigned i_cap_exporting_issued; 293 struct ceph_cap_reservation i_cap_migration_resv; 294 struct list_head i_cap_snaps; /* snapped state pending flush to mds */ 295 struct ceph_snap_context *i_head_snapc; /* set if wr_buffer_head > 0 or 296 dirty|flushing caps */ 297 unsigned i_snap_caps; /* cap bits for snapped files */ 298 299 int i_nr_by_mode[CEPH_FILE_MODE_NUM]; /* open file counts */ 300 301 struct mutex i_truncate_mutex; 302 u32 i_truncate_seq; /* last truncate to smaller size */ 303 u64 i_truncate_size; /* and the size we last truncated down to */ 304 int i_truncate_pending; /* still need to call vmtruncate */ 305 306 u64 i_max_size; /* max file size authorized by mds */ 307 u64 i_reported_size; /* (max_)size reported to or requested of mds */ 308 u64 i_wanted_max_size; /* offset we'd like to write too */ 309 u64 i_requested_max_size; /* max_size we've requested */ 310 311 /* held references to caps */ 312 int i_pin_ref; 313 int i_rd_ref, i_rdcache_ref, i_wr_ref, i_wb_ref; 314 int i_wrbuffer_ref, i_wrbuffer_ref_head; 315 u32 i_shared_gen; /* increment each time we get FILE_SHARED */ 316 u32 i_rdcache_gen; /* incremented each time we get FILE_CACHE. */ 317 u32 i_rdcache_revoking; /* RDCACHE gen to async invalidate, if any */ 318 319 struct list_head i_unsafe_writes; /* uncommitted sync writes */ 320 struct list_head i_unsafe_dirops; /* uncommitted mds dir ops */ 321 spinlock_t i_unsafe_lock; 322 323 struct ceph_snap_realm *i_snap_realm; /* snap realm (if caps) */ 324 int i_snap_realm_counter; /* snap realm (if caps) */ 325 struct list_head i_snap_realm_item; 326 struct list_head i_snap_flush_item; 327 328 struct work_struct i_wb_work; /* writeback work */ 329 struct work_struct i_pg_inv_work; /* page invalidation work */ 330 331 struct work_struct i_vmtruncate_work; 332 333 #ifdef CONFIG_CEPH_FSCACHE 334 struct fscache_cookie *fscache; 335 u32 i_fscache_gen; /* sequence, for delayed fscache validate */ 336 struct work_struct i_revalidate_work; 337 #endif 338 339 struct inode vfs_inode; /* at end */ 340 }; 341 342 static inline struct ceph_inode_info *ceph_inode(struct inode *inode) 343 { 344 return container_of(inode, struct ceph_inode_info, vfs_inode); 345 } 346 347 static inline struct ceph_fs_client *ceph_inode_to_client(struct inode *inode) 348 { 349 return (struct ceph_fs_client *)inode->i_sb->s_fs_info; 350 } 351 352 static inline struct ceph_fs_client *ceph_sb_to_client(struct super_block *sb) 353 { 354 return (struct ceph_fs_client *)sb->s_fs_info; 355 } 356 357 static inline struct ceph_vino ceph_vino(struct inode *inode) 358 { 359 return ceph_inode(inode)->i_vino; 360 } 361 362 /* 363 * ino_t is <64 bits on many architectures, blech. 364 * 365 * i_ino (kernel inode) st_ino (userspace) 366 * i386 32 32 367 * x86_64+ino32 64 32 368 * x86_64 64 64 369 */ 370 static inline u32 ceph_ino_to_ino32(__u64 vino) 371 { 372 u32 ino = vino & 0xffffffff; 373 ino ^= vino >> 32; 374 if (!ino) 375 ino = 2; 376 return ino; 377 } 378 379 /* 380 * kernel i_ino value 381 */ 382 static inline ino_t ceph_vino_to_ino(struct ceph_vino vino) 383 { 384 #if BITS_PER_LONG == 32 385 return ceph_ino_to_ino32(vino.ino); 386 #else 387 return (ino_t)vino.ino; 388 #endif 389 } 390 391 /* 392 * user-visible ino (stat, filldir) 393 */ 394 #if BITS_PER_LONG == 32 395 static inline ino_t ceph_translate_ino(struct super_block *sb, ino_t ino) 396 { 397 return ino; 398 } 399 #else 400 static inline ino_t ceph_translate_ino(struct super_block *sb, ino_t ino) 401 { 402 if (ceph_test_mount_opt(ceph_sb_to_client(sb), INO32)) 403 ino = ceph_ino_to_ino32(ino); 404 return ino; 405 } 406 #endif 407 408 409 /* for printf-style formatting */ 410 #define ceph_vinop(i) ceph_inode(i)->i_vino.ino, ceph_inode(i)->i_vino.snap 411 412 static inline u64 ceph_ino(struct inode *inode) 413 { 414 return ceph_inode(inode)->i_vino.ino; 415 } 416 static inline u64 ceph_snap(struct inode *inode) 417 { 418 return ceph_inode(inode)->i_vino.snap; 419 } 420 421 static inline int ceph_ino_compare(struct inode *inode, void *data) 422 { 423 struct ceph_vino *pvino = (struct ceph_vino *)data; 424 struct ceph_inode_info *ci = ceph_inode(inode); 425 return ci->i_vino.ino == pvino->ino && 426 ci->i_vino.snap == pvino->snap; 427 } 428 429 static inline struct inode *ceph_find_inode(struct super_block *sb, 430 struct ceph_vino vino) 431 { 432 ino_t t = ceph_vino_to_ino(vino); 433 return ilookup5(sb, t, ceph_ino_compare, &vino); 434 } 435 436 437 /* 438 * Ceph inode. 439 */ 440 #define CEPH_I_NODELAY 4 /* do not delay cap release */ 441 #define CEPH_I_FLUSH 8 /* do not delay flush of dirty metadata */ 442 #define CEPH_I_NOFLUSH 16 /* do not flush dirty caps */ 443 444 static inline void __ceph_dir_set_complete(struct ceph_inode_info *ci, 445 int release_count) 446 { 447 atomic_set(&ci->i_complete_count, release_count); 448 } 449 450 static inline void __ceph_dir_clear_complete(struct ceph_inode_info *ci) 451 { 452 atomic_inc(&ci->i_release_count); 453 } 454 455 static inline bool __ceph_dir_is_complete(struct ceph_inode_info *ci) 456 { 457 return atomic_read(&ci->i_complete_count) == 458 atomic_read(&ci->i_release_count); 459 } 460 461 static inline void ceph_dir_clear_complete(struct inode *inode) 462 { 463 __ceph_dir_clear_complete(ceph_inode(inode)); 464 } 465 466 static inline bool ceph_dir_is_complete(struct inode *inode) 467 { 468 return __ceph_dir_is_complete(ceph_inode(inode)); 469 } 470 471 472 /* find a specific frag @f */ 473 extern struct ceph_inode_frag *__ceph_find_frag(struct ceph_inode_info *ci, 474 u32 f); 475 476 /* 477 * choose fragment for value @v. copy frag content to pfrag, if leaf 478 * exists 479 */ 480 extern u32 ceph_choose_frag(struct ceph_inode_info *ci, u32 v, 481 struct ceph_inode_frag *pfrag, 482 int *found); 483 484 static inline struct ceph_dentry_info *ceph_dentry(struct dentry *dentry) 485 { 486 return (struct ceph_dentry_info *)dentry->d_fsdata; 487 } 488 489 static inline loff_t ceph_make_fpos(unsigned frag, unsigned off) 490 { 491 return ((loff_t)frag << 32) | (loff_t)off; 492 } 493 494 /* 495 * caps helpers 496 */ 497 static inline bool __ceph_is_any_real_caps(struct ceph_inode_info *ci) 498 { 499 return !RB_EMPTY_ROOT(&ci->i_caps); 500 } 501 502 extern int __ceph_caps_issued(struct ceph_inode_info *ci, int *implemented); 503 extern int __ceph_caps_issued_mask(struct ceph_inode_info *ci, int mask, int t); 504 extern int __ceph_caps_issued_other(struct ceph_inode_info *ci, 505 struct ceph_cap *cap); 506 507 static inline int ceph_caps_issued(struct ceph_inode_info *ci) 508 { 509 int issued; 510 spin_lock(&ci->i_ceph_lock); 511 issued = __ceph_caps_issued(ci, NULL); 512 spin_unlock(&ci->i_ceph_lock); 513 return issued; 514 } 515 516 static inline int ceph_caps_issued_mask(struct ceph_inode_info *ci, int mask, 517 int touch) 518 { 519 int r; 520 spin_lock(&ci->i_ceph_lock); 521 r = __ceph_caps_issued_mask(ci, mask, touch); 522 spin_unlock(&ci->i_ceph_lock); 523 return r; 524 } 525 526 static inline int __ceph_caps_dirty(struct ceph_inode_info *ci) 527 { 528 return ci->i_dirty_caps | ci->i_flushing_caps; 529 } 530 extern int __ceph_mark_dirty_caps(struct ceph_inode_info *ci, int mask); 531 532 extern int ceph_caps_revoking(struct ceph_inode_info *ci, int mask); 533 extern int __ceph_caps_used(struct ceph_inode_info *ci); 534 535 extern int __ceph_caps_file_wanted(struct ceph_inode_info *ci); 536 537 /* 538 * wanted, by virtue of open file modes AND cap refs (buffered/cached data) 539 */ 540 static inline int __ceph_caps_wanted(struct ceph_inode_info *ci) 541 { 542 int w = __ceph_caps_file_wanted(ci) | __ceph_caps_used(ci); 543 if (w & CEPH_CAP_FILE_BUFFER) 544 w |= CEPH_CAP_FILE_EXCL; /* we want EXCL if dirty data */ 545 return w; 546 } 547 548 /* what the mds thinks we want */ 549 extern int __ceph_caps_mds_wanted(struct ceph_inode_info *ci); 550 551 extern void ceph_caps_init(struct ceph_mds_client *mdsc); 552 extern void ceph_caps_finalize(struct ceph_mds_client *mdsc); 553 extern void ceph_adjust_min_caps(struct ceph_mds_client *mdsc, int delta); 554 extern void ceph_reserve_caps(struct ceph_mds_client *mdsc, 555 struct ceph_cap_reservation *ctx, int need); 556 extern int ceph_unreserve_caps(struct ceph_mds_client *mdsc, 557 struct ceph_cap_reservation *ctx); 558 extern void ceph_reservation_status(struct ceph_fs_client *client, 559 int *total, int *avail, int *used, 560 int *reserved, int *min); 561 562 563 564 /* 565 * we keep buffered readdir results attached to file->private_data 566 */ 567 #define CEPH_F_SYNC 1 568 #define CEPH_F_ATEND 2 569 570 struct ceph_file_info { 571 short fmode; /* initialized on open */ 572 short flags; /* CEPH_F_* */ 573 574 /* readdir: position within the dir */ 575 u32 frag; 576 struct ceph_mds_request *last_readdir; 577 578 /* readdir: position within a frag */ 579 unsigned offset; /* offset of last chunk, adjusted for . and .. */ 580 u64 next_offset; /* offset of next chunk (last_name's + 1) */ 581 char *last_name; /* last entry in previous chunk */ 582 struct dentry *dentry; /* next dentry (for dcache readdir) */ 583 int dir_release_count; 584 585 /* used for -o dirstat read() on directory thing */ 586 char *dir_info; 587 int dir_info_len; 588 }; 589 590 591 592 /* 593 * A "snap realm" describes a subset of the file hierarchy sharing 594 * the same set of snapshots that apply to it. The realms themselves 595 * are organized into a hierarchy, such that children inherit (some of) 596 * the snapshots of their parents. 597 * 598 * All inodes within the realm that have capabilities are linked into a 599 * per-realm list. 600 */ 601 struct ceph_snap_realm { 602 u64 ino; 603 atomic_t nref; 604 struct rb_node node; 605 606 u64 created, seq; 607 u64 parent_ino; 608 u64 parent_since; /* snapid when our current parent became so */ 609 610 u64 *prior_parent_snaps; /* snaps inherited from any parents we */ 611 u32 num_prior_parent_snaps; /* had prior to parent_since */ 612 u64 *snaps; /* snaps specific to this realm */ 613 u32 num_snaps; 614 615 struct ceph_snap_realm *parent; 616 struct list_head children; /* list of child realms */ 617 struct list_head child_item; 618 619 struct list_head empty_item; /* if i have ref==0 */ 620 621 struct list_head dirty_item; /* if realm needs new context */ 622 623 /* the current set of snaps for this realm */ 624 struct ceph_snap_context *cached_context; 625 626 struct list_head inodes_with_caps; 627 spinlock_t inodes_with_caps_lock; 628 }; 629 630 static inline int default_congestion_kb(void) 631 { 632 int congestion_kb; 633 634 /* 635 * Copied from NFS 636 * 637 * congestion size, scale with available memory. 638 * 639 * 64MB: 8192k 640 * 128MB: 11585k 641 * 256MB: 16384k 642 * 512MB: 23170k 643 * 1GB: 32768k 644 * 2GB: 46340k 645 * 4GB: 65536k 646 * 8GB: 92681k 647 * 16GB: 131072k 648 * 649 * This allows larger machines to have larger/more transfers. 650 * Limit the default to 256M 651 */ 652 congestion_kb = (16*int_sqrt(totalram_pages)) << (PAGE_SHIFT-10); 653 if (congestion_kb > 256*1024) 654 congestion_kb = 256*1024; 655 656 return congestion_kb; 657 } 658 659 660 661 /* snap.c */ 662 struct ceph_snap_realm *ceph_lookup_snap_realm(struct ceph_mds_client *mdsc, 663 u64 ino); 664 extern void ceph_get_snap_realm(struct ceph_mds_client *mdsc, 665 struct ceph_snap_realm *realm); 666 extern void ceph_put_snap_realm(struct ceph_mds_client *mdsc, 667 struct ceph_snap_realm *realm); 668 extern int ceph_update_snap_trace(struct ceph_mds_client *m, 669 void *p, void *e, bool deletion); 670 extern void ceph_handle_snap(struct ceph_mds_client *mdsc, 671 struct ceph_mds_session *session, 672 struct ceph_msg *msg); 673 extern void ceph_queue_cap_snap(struct ceph_inode_info *ci); 674 extern int __ceph_finish_cap_snap(struct ceph_inode_info *ci, 675 struct ceph_cap_snap *capsnap); 676 extern void ceph_cleanup_empty_realms(struct ceph_mds_client *mdsc); 677 678 /* 679 * a cap_snap is "pending" if it is still awaiting an in-progress 680 * sync write (that may/may not still update size, mtime, etc.). 681 */ 682 static inline bool __ceph_have_pending_cap_snap(struct ceph_inode_info *ci) 683 { 684 return !list_empty(&ci->i_cap_snaps) && 685 list_entry(ci->i_cap_snaps.prev, struct ceph_cap_snap, 686 ci_item)->writing; 687 } 688 689 /* inode.c */ 690 extern const struct inode_operations ceph_file_iops; 691 692 extern struct inode *ceph_alloc_inode(struct super_block *sb); 693 extern void ceph_destroy_inode(struct inode *inode); 694 695 extern struct inode *ceph_get_inode(struct super_block *sb, 696 struct ceph_vino vino); 697 extern struct inode *ceph_get_snapdir(struct inode *parent); 698 extern int ceph_fill_file_size(struct inode *inode, int issued, 699 u32 truncate_seq, u64 truncate_size, u64 size); 700 extern void ceph_fill_file_time(struct inode *inode, int issued, 701 u64 time_warp_seq, struct timespec *ctime, 702 struct timespec *mtime, struct timespec *atime); 703 extern int ceph_fill_trace(struct super_block *sb, 704 struct ceph_mds_request *req, 705 struct ceph_mds_session *session); 706 extern int ceph_readdir_prepopulate(struct ceph_mds_request *req, 707 struct ceph_mds_session *session); 708 709 extern int ceph_inode_holds_cap(struct inode *inode, int mask); 710 711 extern int ceph_inode_set_size(struct inode *inode, loff_t size); 712 extern void __ceph_do_pending_vmtruncate(struct inode *inode); 713 extern void ceph_queue_vmtruncate(struct inode *inode); 714 715 extern void ceph_queue_invalidate(struct inode *inode); 716 extern void ceph_queue_writeback(struct inode *inode); 717 718 extern int ceph_do_getattr(struct inode *inode, int mask); 719 extern int ceph_permission(struct inode *inode, int mask); 720 extern int ceph_setattr(struct dentry *dentry, struct iattr *attr); 721 extern int ceph_getattr(struct vfsmount *mnt, struct dentry *dentry, 722 struct kstat *stat); 723 724 /* xattr.c */ 725 extern int ceph_setxattr(struct dentry *, const char *, const void *, 726 size_t, int); 727 extern ssize_t ceph_getxattr(struct dentry *, const char *, void *, size_t); 728 extern ssize_t ceph_listxattr(struct dentry *, char *, size_t); 729 extern int ceph_removexattr(struct dentry *, const char *); 730 extern void __ceph_build_xattrs_blob(struct ceph_inode_info *ci); 731 extern void __ceph_destroy_xattrs(struct ceph_inode_info *ci); 732 extern void __init ceph_xattr_init(void); 733 extern void ceph_xattr_exit(void); 734 735 /* caps.c */ 736 extern const char *ceph_cap_string(int c); 737 extern void ceph_handle_caps(struct ceph_mds_session *session, 738 struct ceph_msg *msg); 739 extern int ceph_add_cap(struct inode *inode, 740 struct ceph_mds_session *session, u64 cap_id, 741 int fmode, unsigned issued, unsigned wanted, 742 unsigned cap, unsigned seq, u64 realmino, int flags, 743 struct ceph_cap_reservation *caps_reservation); 744 extern void __ceph_remove_cap(struct ceph_cap *cap, bool queue_release); 745 extern void ceph_put_cap(struct ceph_mds_client *mdsc, 746 struct ceph_cap *cap); 747 748 extern void __queue_cap_release(struct ceph_mds_session *session, u64 ino, 749 u64 cap_id, u32 migrate_seq, u32 issue_seq); 750 extern void ceph_queue_caps_release(struct inode *inode); 751 extern int ceph_write_inode(struct inode *inode, struct writeback_control *wbc); 752 extern int ceph_fsync(struct file *file, loff_t start, loff_t end, 753 int datasync); 754 extern void ceph_kick_flushing_caps(struct ceph_mds_client *mdsc, 755 struct ceph_mds_session *session); 756 extern struct ceph_cap *ceph_get_cap_for_mds(struct ceph_inode_info *ci, 757 int mds); 758 extern int ceph_get_cap_mds(struct inode *inode); 759 extern void ceph_get_cap_refs(struct ceph_inode_info *ci, int caps); 760 extern void ceph_put_cap_refs(struct ceph_inode_info *ci, int had); 761 extern void ceph_put_wrbuffer_cap_refs(struct ceph_inode_info *ci, int nr, 762 struct ceph_snap_context *snapc); 763 extern void __ceph_flush_snaps(struct ceph_inode_info *ci, 764 struct ceph_mds_session **psession, 765 int again); 766 extern void ceph_check_caps(struct ceph_inode_info *ci, int flags, 767 struct ceph_mds_session *session); 768 extern void ceph_check_delayed_caps(struct ceph_mds_client *mdsc); 769 extern void ceph_flush_dirty_caps(struct ceph_mds_client *mdsc); 770 771 extern int ceph_encode_inode_release(void **p, struct inode *inode, 772 int mds, int drop, int unless, int force); 773 extern int ceph_encode_dentry_release(void **p, struct dentry *dn, 774 int mds, int drop, int unless); 775 776 extern int ceph_get_caps(struct ceph_inode_info *ci, int need, int want, 777 int *got, loff_t endoff); 778 779 /* for counting open files by mode */ 780 static inline void __ceph_get_fmode(struct ceph_inode_info *ci, int mode) 781 { 782 ci->i_nr_by_mode[mode]++; 783 } 784 extern void ceph_put_fmode(struct ceph_inode_info *ci, int mode); 785 786 /* addr.c */ 787 extern const struct address_space_operations ceph_aops; 788 extern int ceph_mmap(struct file *file, struct vm_area_struct *vma); 789 790 /* file.c */ 791 extern const struct file_operations ceph_file_fops; 792 extern const struct address_space_operations ceph_aops; 793 794 extern int ceph_open(struct inode *inode, struct file *file); 795 extern int ceph_atomic_open(struct inode *dir, struct dentry *dentry, 796 struct file *file, unsigned flags, umode_t mode, 797 int *opened); 798 extern int ceph_release(struct inode *inode, struct file *filp); 799 800 /* dir.c */ 801 extern const struct file_operations ceph_dir_fops; 802 extern const struct inode_operations ceph_dir_iops; 803 extern const struct dentry_operations ceph_dentry_ops, ceph_snap_dentry_ops, 804 ceph_snapdir_dentry_ops; 805 806 extern int ceph_handle_notrace_create(struct inode *dir, struct dentry *dentry); 807 extern int ceph_handle_snapdir(struct ceph_mds_request *req, 808 struct dentry *dentry, int err); 809 extern struct dentry *ceph_finish_lookup(struct ceph_mds_request *req, 810 struct dentry *dentry, int err); 811 812 extern void ceph_dentry_lru_add(struct dentry *dn); 813 extern void ceph_dentry_lru_touch(struct dentry *dn); 814 extern void ceph_dentry_lru_del(struct dentry *dn); 815 extern void ceph_invalidate_dentry_lease(struct dentry *dentry); 816 extern unsigned ceph_dentry_hash(struct inode *dir, struct dentry *dn); 817 extern struct inode *ceph_get_dentry_parent_inode(struct dentry *dentry); 818 819 /* 820 * our d_ops vary depending on whether the inode is live, 821 * snapshotted (read-only), or a virtual ".snap" directory. 822 */ 823 int ceph_init_dentry(struct dentry *dentry); 824 825 826 /* ioctl.c */ 827 extern long ceph_ioctl(struct file *file, unsigned int cmd, unsigned long arg); 828 829 /* export.c */ 830 extern const struct export_operations ceph_export_ops; 831 832 /* locks.c */ 833 extern int ceph_lock(struct file *file, int cmd, struct file_lock *fl); 834 extern int ceph_flock(struct file *file, int cmd, struct file_lock *fl); 835 extern void ceph_count_locks(struct inode *inode, int *p_num, int *f_num); 836 extern int ceph_encode_locks_to_buffer(struct inode *inode, 837 struct ceph_filelock *flocks, 838 int num_fcntl_locks, 839 int num_flock_locks); 840 extern int ceph_locks_to_pagelist(struct ceph_filelock *flocks, 841 struct ceph_pagelist *pagelist, 842 int num_fcntl_locks, int num_flock_locks); 843 extern int lock_to_ceph_filelock(struct file_lock *fl, struct ceph_filelock *c); 844 845 /* debugfs.c */ 846 extern int ceph_fs_debugfs_init(struct ceph_fs_client *client); 847 extern void ceph_fs_debugfs_cleanup(struct ceph_fs_client *client); 848 849 #endif /* _FS_CEPH_SUPER_H */ 850