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 #include <linux/posix_acl.h> 17 18 #include <linux/ceph/libceph.h> 19 20 #ifdef CONFIG_CEPH_FSCACHE 21 #include <linux/fscache.h> 22 #endif 23 24 /* f_type in struct statfs */ 25 #define CEPH_SUPER_MAGIC 0x00c36400 26 27 /* large granularity for statfs utilization stats to facilitate 28 * large volume sizes on 32-bit machines. */ 29 #define CEPH_BLOCK_SHIFT 22 /* 4 MB */ 30 #define CEPH_BLOCK (1 << CEPH_BLOCK_SHIFT) 31 32 #define CEPH_MOUNT_OPT_DIRSTAT (1<<4) /* `cat dirname` for stats */ 33 #define CEPH_MOUNT_OPT_RBYTES (1<<5) /* dir st_bytes = rbytes */ 34 #define CEPH_MOUNT_OPT_NOASYNCREADDIR (1<<7) /* no dcache readdir */ 35 #define CEPH_MOUNT_OPT_INO32 (1<<8) /* 32 bit inos */ 36 #define CEPH_MOUNT_OPT_DCACHE (1<<9) /* use dcache for readdir etc */ 37 #define CEPH_MOUNT_OPT_FSCACHE (1<<10) /* use fscache */ 38 39 #define CEPH_MOUNT_OPT_DEFAULT (CEPH_MOUNT_OPT_RBYTES) 40 41 #define ceph_set_mount_opt(fsc, opt) \ 42 (fsc)->mount_options->flags |= CEPH_MOUNT_OPT_##opt; 43 #define ceph_test_mount_opt(fsc, opt) \ 44 (!!((fsc)->mount_options->flags & CEPH_MOUNT_OPT_##opt)) 45 46 #define CEPH_RSIZE_DEFAULT 0 /* max read size */ 47 #define CEPH_RASIZE_DEFAULT (8192*1024) /* readahead */ 48 #define CEPH_MAX_READDIR_DEFAULT 1024 49 #define CEPH_MAX_READDIR_BYTES_DEFAULT (512*1024) 50 #define CEPH_SNAPDIRNAME_DEFAULT ".snap" 51 52 struct ceph_mount_options { 53 int flags; 54 int sb_flags; 55 56 int wsize; /* max write size */ 57 int rsize; /* max read size */ 58 int rasize; /* max readahead */ 59 int congestion_kb; /* max writeback in flight */ 60 int caps_wanted_delay_min, caps_wanted_delay_max; 61 int cap_release_safety; 62 int max_readdir; /* max readdir result (entires) */ 63 int max_readdir_bytes; /* max readdir result (bytes) */ 64 65 /* 66 * everything above this point can be memcmp'd; everything below 67 * is handled in compare_mount_options() 68 */ 69 70 char *snapdir_name; /* default ".snap" */ 71 }; 72 73 struct ceph_fs_client { 74 struct super_block *sb; 75 76 struct ceph_mount_options *mount_options; 77 struct ceph_client *client; 78 79 unsigned long mount_state; 80 int min_caps; /* min caps i added */ 81 82 struct ceph_mds_client *mdsc; 83 84 /* writeback */ 85 mempool_t *wb_pagevec_pool; 86 struct workqueue_struct *wb_wq; 87 struct workqueue_struct *pg_inv_wq; 88 struct workqueue_struct *trunc_wq; 89 atomic_long_t writeback_count; 90 91 struct backing_dev_info backing_dev_info; 92 93 #ifdef CONFIG_DEBUG_FS 94 struct dentry *debugfs_dentry_lru, *debugfs_caps; 95 struct dentry *debugfs_congestion_kb; 96 struct dentry *debugfs_bdi; 97 struct dentry *debugfs_mdsc, *debugfs_mdsmap; 98 #endif 99 100 #ifdef CONFIG_CEPH_FSCACHE 101 struct fscache_cookie *fscache; 102 struct workqueue_struct *revalidate_wq; 103 #endif 104 }; 105 106 107 /* 108 * File i/o capability. This tracks shared state with the metadata 109 * server that allows us to cache or writeback attributes or to read 110 * and write data. For any given inode, we should have one or more 111 * capabilities, one issued by each metadata server, and our 112 * cumulative access is the OR of all issued capabilities. 113 * 114 * Each cap is referenced by the inode's i_caps rbtree and by per-mds 115 * session capability lists. 116 */ 117 struct ceph_cap { 118 struct ceph_inode_info *ci; 119 struct rb_node ci_node; /* per-ci cap tree */ 120 struct ceph_mds_session *session; 121 struct list_head session_caps; /* per-session caplist */ 122 int mds; 123 u64 cap_id; /* unique cap id (mds provided) */ 124 int issued; /* latest, from the mds */ 125 int implemented; /* implemented superset of issued (for revocation) */ 126 int mds_wanted; 127 u32 seq, issue_seq, mseq; 128 u32 cap_gen; /* active/stale cycle */ 129 unsigned long last_used; 130 struct list_head caps_item; 131 }; 132 133 #define CHECK_CAPS_NODELAY 1 /* do not delay any further */ 134 #define CHECK_CAPS_AUTHONLY 2 /* only check auth cap */ 135 #define CHECK_CAPS_FLUSH 4 /* flush any dirty caps */ 136 137 /* 138 * Snapped cap state that is pending flush to mds. When a snapshot occurs, 139 * we first complete any in-process sync writes and writeback any dirty 140 * data before flushing the snapped state (tracked here) back to the MDS. 141 */ 142 struct ceph_cap_snap { 143 atomic_t nref; 144 struct ceph_inode_info *ci; 145 struct list_head ci_item, flushing_item; 146 147 u64 follows, flush_tid; 148 int issued, dirty; 149 struct ceph_snap_context *context; 150 151 umode_t mode; 152 kuid_t uid; 153 kgid_t gid; 154 155 struct ceph_buffer *xattr_blob; 156 u64 xattr_version; 157 158 u64 size; 159 struct timespec mtime, atime, ctime; 160 u64 time_warp_seq; 161 int writing; /* a sync write is still in progress */ 162 int dirty_pages; /* dirty pages awaiting writeback */ 163 }; 164 165 static inline void ceph_put_cap_snap(struct ceph_cap_snap *capsnap) 166 { 167 if (atomic_dec_and_test(&capsnap->nref)) { 168 if (capsnap->xattr_blob) 169 ceph_buffer_put(capsnap->xattr_blob); 170 kfree(capsnap); 171 } 172 } 173 174 /* 175 * The frag tree describes how a directory is fragmented, potentially across 176 * multiple metadata servers. It is also used to indicate points where 177 * metadata authority is delegated, and whether/where metadata is replicated. 178 * 179 * A _leaf_ frag will be present in the i_fragtree IFF there is 180 * delegation info. That is, if mds >= 0 || ndist > 0. 181 */ 182 #define CEPH_MAX_DIRFRAG_REP 4 183 184 struct ceph_inode_frag { 185 struct rb_node node; 186 187 /* fragtree state */ 188 u32 frag; 189 int split_by; /* i.e. 2^(split_by) children */ 190 191 /* delegation and replication info */ 192 int mds; /* -1 if same authority as parent */ 193 int ndist; /* >0 if replicated */ 194 int dist[CEPH_MAX_DIRFRAG_REP]; 195 }; 196 197 /* 198 * We cache inode xattrs as an encoded blob until they are first used, 199 * at which point we parse them into an rbtree. 200 */ 201 struct ceph_inode_xattr { 202 struct rb_node node; 203 204 const char *name; 205 int name_len; 206 const char *val; 207 int val_len; 208 int dirty; 209 210 int should_free_name; 211 int should_free_val; 212 }; 213 214 /* 215 * Ceph dentry state 216 */ 217 struct ceph_dentry_info { 218 struct ceph_mds_session *lease_session; 219 u32 lease_gen, lease_shared_gen; 220 u32 lease_seq; 221 unsigned long lease_renew_after, lease_renew_from; 222 struct list_head lru; 223 struct dentry *dentry; 224 u64 time; 225 u64 offset; 226 }; 227 228 struct ceph_inode_xattrs_info { 229 /* 230 * (still encoded) xattr blob. we avoid the overhead of parsing 231 * this until someone actually calls getxattr, etc. 232 * 233 * blob->vec.iov_len == 4 implies there are no xattrs; blob == 234 * NULL means we don't know. 235 */ 236 struct ceph_buffer *blob, *prealloc_blob; 237 238 struct rb_root index; 239 bool dirty; 240 int count; 241 int names_size; 242 int vals_size; 243 u64 version, index_version; 244 }; 245 246 /* 247 * Ceph inode. 248 */ 249 struct ceph_inode_info { 250 struct ceph_vino i_vino; /* ceph ino + snap */ 251 252 spinlock_t i_ceph_lock; 253 254 u64 i_version; 255 u32 i_time_warp_seq; 256 257 unsigned i_ceph_flags; 258 atomic_t i_release_count; 259 atomic_t i_complete_count; 260 261 struct ceph_dir_layout i_dir_layout; 262 struct ceph_file_layout i_layout; 263 char *i_symlink; 264 265 /* for dirs */ 266 struct timespec i_rctime; 267 u64 i_rbytes, i_rfiles, i_rsubdirs; 268 u64 i_files, i_subdirs; 269 u64 i_max_offset; /* largest readdir offset, set with complete dir */ 270 271 struct rb_root i_fragtree; 272 struct mutex i_fragtree_mutex; 273 274 struct ceph_inode_xattrs_info i_xattrs; 275 276 /* capabilities. protected _both_ by i_ceph_lock and cap->session's 277 * s_mutex. */ 278 struct rb_root i_caps; /* cap list */ 279 struct ceph_cap *i_auth_cap; /* authoritative cap, if any */ 280 unsigned i_dirty_caps, i_flushing_caps; /* mask of dirtied fields */ 281 struct list_head i_dirty_item, i_flushing_item; 282 u64 i_cap_flush_seq; 283 /* we need to track cap writeback on a per-cap-bit basis, to allow 284 * overlapping, pipelined cap flushes to the mds. we can probably 285 * reduce the tid to 8 bits if we're concerned about inode size. */ 286 u16 i_cap_flush_last_tid, i_cap_flush_tid[CEPH_CAP_BITS]; 287 wait_queue_head_t i_cap_wq; /* threads waiting on a capability */ 288 unsigned long i_hold_caps_min; /* jiffies */ 289 unsigned long i_hold_caps_max; /* jiffies */ 290 struct list_head i_cap_delay_list; /* for delayed cap release to mds */ 291 struct ceph_cap_reservation i_cap_migration_resv; 292 struct list_head i_cap_snaps; /* snapped state pending flush to mds */ 293 struct ceph_snap_context *i_head_snapc; /* set if wr_buffer_head > 0 or 294 dirty|flushing caps */ 295 unsigned i_snap_caps; /* cap bits for snapped files */ 296 unsigned i_cap_exporting_issued; 297 298 int i_nr_by_mode[CEPH_FILE_MODE_NUM]; /* open file counts */ 299 300 struct mutex i_truncate_mutex; 301 u32 i_truncate_seq; /* last truncate to smaller size */ 302 u64 i_truncate_size; /* and the size we last truncated down to */ 303 int i_truncate_pending; /* still need to call vmtruncate */ 304 305 u64 i_max_size; /* max file size authorized by mds */ 306 u64 i_reported_size; /* (max_)size reported to or requested of mds */ 307 u64 i_wanted_max_size; /* offset we'd like to write too */ 308 u64 i_requested_max_size; /* max_size we've requested */ 309 310 /* held references to caps */ 311 int i_pin_ref; 312 int i_rd_ref, i_rdcache_ref, i_wr_ref, i_wb_ref; 313 int i_wrbuffer_ref, i_wrbuffer_ref_head; 314 u32 i_shared_gen; /* increment each time we get FILE_SHARED */ 315 u32 i_rdcache_gen; /* incremented each time we get FILE_CACHE. */ 316 u32 i_rdcache_revoking; /* RDCACHE gen to async invalidate, if any */ 317 318 struct list_head i_unsafe_writes; /* uncommitted sync writes */ 319 struct list_head i_unsafe_dirops; /* uncommitted mds dir ops */ 320 spinlock_t i_unsafe_lock; 321 322 struct ceph_snap_realm *i_snap_realm; /* snap realm (if caps) */ 323 int i_snap_realm_counter; /* snap realm (if caps) */ 324 struct list_head i_snap_realm_item; 325 struct list_head i_snap_flush_item; 326 327 struct work_struct i_wb_work; /* writeback work */ 328 struct work_struct i_pg_inv_work; /* page invalidation work */ 329 330 struct work_struct i_vmtruncate_work; 331 332 #ifdef CONFIG_CEPH_FSCACHE 333 struct fscache_cookie *fscache; 334 u32 i_fscache_gen; /* sequence, for delayed fscache validate */ 335 struct work_struct i_revalidate_work; 336 #endif 337 struct inode vfs_inode; /* at end */ 338 }; 339 340 static inline struct ceph_inode_info *ceph_inode(struct inode *inode) 341 { 342 return container_of(inode, struct ceph_inode_info, vfs_inode); 343 } 344 345 static inline struct ceph_fs_client *ceph_inode_to_client(struct inode *inode) 346 { 347 return (struct ceph_fs_client *)inode->i_sb->s_fs_info; 348 } 349 350 static inline struct ceph_fs_client *ceph_sb_to_client(struct super_block *sb) 351 { 352 return (struct ceph_fs_client *)sb->s_fs_info; 353 } 354 355 static inline struct ceph_vino ceph_vino(struct inode *inode) 356 { 357 return ceph_inode(inode)->i_vino; 358 } 359 360 /* 361 * ino_t is <64 bits on many architectures, blech. 362 * 363 * i_ino (kernel inode) st_ino (userspace) 364 * i386 32 32 365 * x86_64+ino32 64 32 366 * x86_64 64 64 367 */ 368 static inline u32 ceph_ino_to_ino32(__u64 vino) 369 { 370 u32 ino = vino & 0xffffffff; 371 ino ^= vino >> 32; 372 if (!ino) 373 ino = 2; 374 return ino; 375 } 376 377 /* 378 * kernel i_ino value 379 */ 380 static inline ino_t ceph_vino_to_ino(struct ceph_vino vino) 381 { 382 #if BITS_PER_LONG == 32 383 return ceph_ino_to_ino32(vino.ino); 384 #else 385 return (ino_t)vino.ino; 386 #endif 387 } 388 389 /* 390 * user-visible ino (stat, filldir) 391 */ 392 #if BITS_PER_LONG == 32 393 static inline ino_t ceph_translate_ino(struct super_block *sb, ino_t ino) 394 { 395 return ino; 396 } 397 #else 398 static inline ino_t ceph_translate_ino(struct super_block *sb, ino_t ino) 399 { 400 if (ceph_test_mount_opt(ceph_sb_to_client(sb), INO32)) 401 ino = ceph_ino_to_ino32(ino); 402 return ino; 403 } 404 #endif 405 406 407 /* for printf-style formatting */ 408 #define ceph_vinop(i) ceph_inode(i)->i_vino.ino, ceph_inode(i)->i_vino.snap 409 410 static inline u64 ceph_ino(struct inode *inode) 411 { 412 return ceph_inode(inode)->i_vino.ino; 413 } 414 static inline u64 ceph_snap(struct inode *inode) 415 { 416 return ceph_inode(inode)->i_vino.snap; 417 } 418 419 static inline int ceph_ino_compare(struct inode *inode, void *data) 420 { 421 struct ceph_vino *pvino = (struct ceph_vino *)data; 422 struct ceph_inode_info *ci = ceph_inode(inode); 423 return ci->i_vino.ino == pvino->ino && 424 ci->i_vino.snap == pvino->snap; 425 } 426 427 static inline struct inode *ceph_find_inode(struct super_block *sb, 428 struct ceph_vino vino) 429 { 430 ino_t t = ceph_vino_to_ino(vino); 431 return ilookup5(sb, t, ceph_ino_compare, &vino); 432 } 433 434 435 /* 436 * Ceph inode. 437 */ 438 #define CEPH_I_NODELAY 4 /* do not delay cap release */ 439 #define CEPH_I_FLUSH 8 /* do not delay flush of dirty metadata */ 440 #define CEPH_I_NOFLUSH 16 /* do not flush dirty caps */ 441 442 static inline void __ceph_dir_set_complete(struct ceph_inode_info *ci, 443 int release_count) 444 { 445 atomic_set(&ci->i_complete_count, release_count); 446 } 447 448 static inline void __ceph_dir_clear_complete(struct ceph_inode_info *ci) 449 { 450 atomic_inc(&ci->i_release_count); 451 } 452 453 static inline bool __ceph_dir_is_complete(struct ceph_inode_info *ci) 454 { 455 return atomic_read(&ci->i_complete_count) == 456 atomic_read(&ci->i_release_count); 457 } 458 459 static inline void ceph_dir_clear_complete(struct inode *inode) 460 { 461 __ceph_dir_clear_complete(ceph_inode(inode)); 462 } 463 464 static inline bool ceph_dir_is_complete(struct inode *inode) 465 { 466 return __ceph_dir_is_complete(ceph_inode(inode)); 467 } 468 469 470 /* find a specific frag @f */ 471 extern struct ceph_inode_frag *__ceph_find_frag(struct ceph_inode_info *ci, 472 u32 f); 473 474 /* 475 * choose fragment for value @v. copy frag content to pfrag, if leaf 476 * exists 477 */ 478 extern u32 ceph_choose_frag(struct ceph_inode_info *ci, u32 v, 479 struct ceph_inode_frag *pfrag, 480 int *found); 481 482 static inline struct ceph_dentry_info *ceph_dentry(struct dentry *dentry) 483 { 484 return (struct ceph_dentry_info *)dentry->d_fsdata; 485 } 486 487 static inline loff_t ceph_make_fpos(unsigned frag, unsigned off) 488 { 489 return ((loff_t)frag << 32) | (loff_t)off; 490 } 491 492 /* 493 * caps helpers 494 */ 495 static inline bool __ceph_is_any_real_caps(struct ceph_inode_info *ci) 496 { 497 return !RB_EMPTY_ROOT(&ci->i_caps); 498 } 499 500 extern int __ceph_caps_issued(struct ceph_inode_info *ci, int *implemented); 501 extern int __ceph_caps_issued_mask(struct ceph_inode_info *ci, int mask, int t); 502 extern int __ceph_caps_issued_other(struct ceph_inode_info *ci, 503 struct ceph_cap *cap); 504 505 static inline int ceph_caps_issued(struct ceph_inode_info *ci) 506 { 507 int issued; 508 spin_lock(&ci->i_ceph_lock); 509 issued = __ceph_caps_issued(ci, NULL); 510 spin_unlock(&ci->i_ceph_lock); 511 return issued; 512 } 513 514 static inline int ceph_caps_issued_mask(struct ceph_inode_info *ci, int mask, 515 int touch) 516 { 517 int r; 518 spin_lock(&ci->i_ceph_lock); 519 r = __ceph_caps_issued_mask(ci, mask, touch); 520 spin_unlock(&ci->i_ceph_lock); 521 return r; 522 } 523 524 static inline int __ceph_caps_dirty(struct ceph_inode_info *ci) 525 { 526 return ci->i_dirty_caps | ci->i_flushing_caps; 527 } 528 extern int __ceph_mark_dirty_caps(struct ceph_inode_info *ci, int mask); 529 530 extern int __ceph_caps_revoking_other(struct ceph_inode_info *ci, 531 struct ceph_cap *ocap, int mask); 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 extern int ceph_drop_inode(struct inode *inode); 695 696 extern struct inode *ceph_get_inode(struct super_block *sb, 697 struct ceph_vino vino); 698 extern struct inode *ceph_get_snapdir(struct inode *parent); 699 extern int ceph_fill_file_size(struct inode *inode, int issued, 700 u32 truncate_seq, u64 truncate_size, u64 size); 701 extern void ceph_fill_file_time(struct inode *inode, int issued, 702 u64 time_warp_seq, struct timespec *ctime, 703 struct timespec *mtime, struct timespec *atime); 704 extern int ceph_fill_trace(struct super_block *sb, 705 struct ceph_mds_request *req, 706 struct ceph_mds_session *session); 707 extern int ceph_readdir_prepopulate(struct ceph_mds_request *req, 708 struct ceph_mds_session *session); 709 710 extern int ceph_inode_holds_cap(struct inode *inode, int mask); 711 712 extern int ceph_inode_set_size(struct inode *inode, loff_t size); 713 extern void __ceph_do_pending_vmtruncate(struct inode *inode); 714 extern void ceph_queue_vmtruncate(struct inode *inode); 715 716 extern void ceph_queue_invalidate(struct inode *inode); 717 extern void ceph_queue_writeback(struct inode *inode); 718 719 extern int ceph_do_getattr(struct inode *inode, int mask); 720 extern int ceph_permission(struct inode *inode, int mask); 721 extern int ceph_setattr(struct dentry *dentry, struct iattr *attr); 722 extern int ceph_getattr(struct vfsmount *mnt, struct dentry *dentry, 723 struct kstat *stat); 724 725 /* xattr.c */ 726 extern int ceph_setxattr(struct dentry *, const char *, const void *, 727 size_t, int); 728 int __ceph_setxattr(struct dentry *, const char *, const void *, size_t, int); 729 ssize_t __ceph_getxattr(struct inode *, const char *, void *, size_t); 730 int __ceph_removexattr(struct dentry *, const char *); 731 extern ssize_t ceph_getxattr(struct dentry *, const char *, void *, size_t); 732 extern ssize_t ceph_listxattr(struct dentry *, char *, size_t); 733 extern int ceph_removexattr(struct dentry *, const char *); 734 extern void __ceph_build_xattrs_blob(struct ceph_inode_info *ci); 735 extern void __ceph_destroy_xattrs(struct ceph_inode_info *ci); 736 extern void __init ceph_xattr_init(void); 737 extern void ceph_xattr_exit(void); 738 739 /* acl.c */ 740 extern const struct xattr_handler *ceph_xattr_handlers[]; 741 742 #ifdef CONFIG_CEPH_FS_POSIX_ACL 743 744 struct posix_acl *ceph_get_acl(struct inode *, int); 745 int ceph_set_acl(struct inode *inode, struct posix_acl *acl, int type); 746 int ceph_init_acl(struct dentry *, struct inode *, struct inode *); 747 748 static inline void ceph_forget_all_cached_acls(struct inode *inode) 749 { 750 forget_all_cached_acls(inode); 751 } 752 753 #else 754 755 #define ceph_get_acl NULL 756 #define ceph_set_acl NULL 757 758 static inline int ceph_init_acl(struct dentry *dentry, struct inode *inode, 759 struct inode *dir) 760 { 761 return 0; 762 } 763 764 static inline int ceph_acl_chmod(struct dentry *dentry, struct inode *inode) 765 { 766 return 0; 767 } 768 769 static inline void ceph_forget_all_cached_acls(struct inode *inode) 770 { 771 } 772 773 #endif 774 775 /* caps.c */ 776 extern const char *ceph_cap_string(int c); 777 extern void ceph_handle_caps(struct ceph_mds_session *session, 778 struct ceph_msg *msg); 779 extern int ceph_add_cap(struct inode *inode, 780 struct ceph_mds_session *session, u64 cap_id, 781 int fmode, unsigned issued, unsigned wanted, 782 unsigned cap, unsigned seq, u64 realmino, int flags, 783 struct ceph_cap_reservation *caps_reservation); 784 extern void __ceph_remove_cap(struct ceph_cap *cap, bool queue_release); 785 extern void ceph_put_cap(struct ceph_mds_client *mdsc, 786 struct ceph_cap *cap); 787 extern int ceph_is_any_caps(struct inode *inode); 788 789 extern void __queue_cap_release(struct ceph_mds_session *session, u64 ino, 790 u64 cap_id, u32 migrate_seq, u32 issue_seq); 791 extern void ceph_queue_caps_release(struct inode *inode); 792 extern int ceph_write_inode(struct inode *inode, struct writeback_control *wbc); 793 extern int ceph_fsync(struct file *file, loff_t start, loff_t end, 794 int datasync); 795 extern void ceph_kick_flushing_caps(struct ceph_mds_client *mdsc, 796 struct ceph_mds_session *session); 797 extern struct ceph_cap *ceph_get_cap_for_mds(struct ceph_inode_info *ci, 798 int mds); 799 extern int ceph_get_cap_mds(struct inode *inode); 800 extern void ceph_get_cap_refs(struct ceph_inode_info *ci, int caps); 801 extern void ceph_put_cap_refs(struct ceph_inode_info *ci, int had); 802 extern void ceph_put_wrbuffer_cap_refs(struct ceph_inode_info *ci, int nr, 803 struct ceph_snap_context *snapc); 804 extern void __ceph_flush_snaps(struct ceph_inode_info *ci, 805 struct ceph_mds_session **psession, 806 int again); 807 extern void ceph_check_caps(struct ceph_inode_info *ci, int flags, 808 struct ceph_mds_session *session); 809 extern void ceph_check_delayed_caps(struct ceph_mds_client *mdsc); 810 extern void ceph_flush_dirty_caps(struct ceph_mds_client *mdsc); 811 812 extern int ceph_encode_inode_release(void **p, struct inode *inode, 813 int mds, int drop, int unless, int force); 814 extern int ceph_encode_dentry_release(void **p, struct dentry *dn, 815 int mds, int drop, int unless); 816 817 extern int ceph_get_caps(struct ceph_inode_info *ci, int need, int want, 818 int *got, loff_t endoff); 819 820 /* for counting open files by mode */ 821 static inline void __ceph_get_fmode(struct ceph_inode_info *ci, int mode) 822 { 823 ci->i_nr_by_mode[mode]++; 824 } 825 extern void ceph_put_fmode(struct ceph_inode_info *ci, int mode); 826 827 /* addr.c */ 828 extern const struct address_space_operations ceph_aops; 829 extern int ceph_mmap(struct file *file, struct vm_area_struct *vma); 830 831 /* file.c */ 832 extern const struct file_operations ceph_file_fops; 833 extern const struct address_space_operations ceph_aops; 834 835 extern int ceph_open(struct inode *inode, struct file *file); 836 extern int ceph_atomic_open(struct inode *dir, struct dentry *dentry, 837 struct file *file, unsigned flags, umode_t mode, 838 int *opened); 839 extern int ceph_release(struct inode *inode, struct file *filp); 840 841 /* dir.c */ 842 extern const struct file_operations ceph_dir_fops; 843 extern const struct inode_operations ceph_dir_iops; 844 extern const struct dentry_operations ceph_dentry_ops, ceph_snap_dentry_ops, 845 ceph_snapdir_dentry_ops; 846 847 extern int ceph_handle_notrace_create(struct inode *dir, struct dentry *dentry); 848 extern int ceph_handle_snapdir(struct ceph_mds_request *req, 849 struct dentry *dentry, int err); 850 extern struct dentry *ceph_finish_lookup(struct ceph_mds_request *req, 851 struct dentry *dentry, int err); 852 853 extern void ceph_dentry_lru_add(struct dentry *dn); 854 extern void ceph_dentry_lru_touch(struct dentry *dn); 855 extern void ceph_dentry_lru_del(struct dentry *dn); 856 extern void ceph_invalidate_dentry_lease(struct dentry *dentry); 857 extern unsigned ceph_dentry_hash(struct inode *dir, struct dentry *dn); 858 extern struct inode *ceph_get_dentry_parent_inode(struct dentry *dentry); 859 860 /* 861 * our d_ops vary depending on whether the inode is live, 862 * snapshotted (read-only), or a virtual ".snap" directory. 863 */ 864 int ceph_init_dentry(struct dentry *dentry); 865 866 867 /* ioctl.c */ 868 extern long ceph_ioctl(struct file *file, unsigned int cmd, unsigned long arg); 869 870 /* export.c */ 871 extern const struct export_operations ceph_export_ops; 872 873 /* locks.c */ 874 extern int ceph_lock(struct file *file, int cmd, struct file_lock *fl); 875 extern int ceph_flock(struct file *file, int cmd, struct file_lock *fl); 876 extern void ceph_count_locks(struct inode *inode, int *p_num, int *f_num); 877 extern int ceph_encode_locks_to_buffer(struct inode *inode, 878 struct ceph_filelock *flocks, 879 int num_fcntl_locks, 880 int num_flock_locks); 881 extern int ceph_locks_to_pagelist(struct ceph_filelock *flocks, 882 struct ceph_pagelist *pagelist, 883 int num_fcntl_locks, int num_flock_locks); 884 extern int lock_to_ceph_filelock(struct file_lock *fl, struct ceph_filelock *c); 885 886 /* debugfs.c */ 887 extern int ceph_fs_debugfs_init(struct ceph_fs_client *client); 888 extern void ceph_fs_debugfs_cleanup(struct ceph_fs_client *client); 889 890 #endif /* _FS_CEPH_SUPER_H */ 891