1 #ifndef _FS_CEPH_SUPER_H 2 #define _FS_CEPH_SUPER_H 3 4 #include "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 "types.h" 18 #include "messenger.h" 19 #include "msgpool.h" 20 #include "mon_client.h" 21 #include "mds_client.h" 22 #include "osd_client.h" 23 #include "ceph_fs.h" 24 25 /* f_type in struct statfs */ 26 #define CEPH_SUPER_MAGIC 0x00c36400 27 28 /* large granularity for statfs utilization stats to facilitate 29 * large volume sizes on 32-bit machines. */ 30 #define CEPH_BLOCK_SHIFT 20 /* 1 MB */ 31 #define CEPH_BLOCK (1 << CEPH_BLOCK_SHIFT) 32 33 /* 34 * Supported features 35 */ 36 #define CEPH_FEATURE_SUPPORTED CEPH_FEATURE_NOSRCADDR | CEPH_FEATURE_FLOCK 37 #define CEPH_FEATURE_REQUIRED CEPH_FEATURE_NOSRCADDR 38 39 /* 40 * mount options 41 */ 42 #define CEPH_OPT_FSID (1<<0) 43 #define CEPH_OPT_NOSHARE (1<<1) /* don't share client with other sbs */ 44 #define CEPH_OPT_MYIP (1<<2) /* specified my ip */ 45 #define CEPH_OPT_DIRSTAT (1<<4) /* funky `cat dirname` for stats */ 46 #define CEPH_OPT_RBYTES (1<<5) /* dir st_bytes = rbytes */ 47 #define CEPH_OPT_NOCRC (1<<6) /* no data crc on writes */ 48 #define CEPH_OPT_NOASYNCREADDIR (1<<7) /* no dcache readdir */ 49 50 #define CEPH_OPT_DEFAULT (CEPH_OPT_RBYTES) 51 52 #define ceph_set_opt(client, opt) \ 53 (client)->mount_args->flags |= CEPH_OPT_##opt; 54 #define ceph_test_opt(client, opt) \ 55 (!!((client)->mount_args->flags & CEPH_OPT_##opt)) 56 57 58 struct ceph_mount_args { 59 int sb_flags; 60 int flags; 61 struct ceph_fsid fsid; 62 struct ceph_entity_addr my_addr; 63 int num_mon; 64 struct ceph_entity_addr *mon_addr; 65 int mount_timeout; 66 int osd_idle_ttl; 67 int osd_timeout; 68 int osd_keepalive_timeout; 69 int wsize; 70 int rsize; /* max readahead */ 71 int congestion_kb; /* max writeback in flight */ 72 int caps_wanted_delay_min, caps_wanted_delay_max; 73 int cap_release_safety; 74 int max_readdir; /* max readdir result (entires) */ 75 int max_readdir_bytes; /* max readdir result (bytes) */ 76 char *snapdir_name; /* default ".snap" */ 77 char *name; 78 char *secret; 79 }; 80 81 /* 82 * defaults 83 */ 84 #define CEPH_MOUNT_TIMEOUT_DEFAULT 60 85 #define CEPH_OSD_TIMEOUT_DEFAULT 60 /* seconds */ 86 #define CEPH_OSD_KEEPALIVE_DEFAULT 5 87 #define CEPH_OSD_IDLE_TTL_DEFAULT 60 88 #define CEPH_MOUNT_RSIZE_DEFAULT (512*1024) /* readahead */ 89 #define CEPH_MAX_READDIR_DEFAULT 1024 90 #define CEPH_MAX_READDIR_BYTES_DEFAULT (512*1024) 91 92 #define CEPH_MSG_MAX_FRONT_LEN (16*1024*1024) 93 #define CEPH_MSG_MAX_DATA_LEN (16*1024*1024) 94 95 #define CEPH_SNAPDIRNAME_DEFAULT ".snap" 96 #define CEPH_AUTH_NAME_DEFAULT "guest" 97 /* 98 * Delay telling the MDS we no longer want caps, in case we reopen 99 * the file. Delay a minimum amount of time, even if we send a cap 100 * message for some other reason. Otherwise, take the oppotunity to 101 * update the mds to avoid sending another message later. 102 */ 103 #define CEPH_CAPS_WANTED_DELAY_MIN_DEFAULT 5 /* cap release delay */ 104 #define CEPH_CAPS_WANTED_DELAY_MAX_DEFAULT 60 /* cap release delay */ 105 106 #define CEPH_CAP_RELEASE_SAFETY_DEFAULT (CEPH_CAPS_PER_RELEASE * 4) 107 108 /* mount state */ 109 enum { 110 CEPH_MOUNT_MOUNTING, 111 CEPH_MOUNT_MOUNTED, 112 CEPH_MOUNT_UNMOUNTING, 113 CEPH_MOUNT_UNMOUNTED, 114 CEPH_MOUNT_SHUTDOWN, 115 }; 116 117 /* 118 * subtract jiffies 119 */ 120 static inline unsigned long time_sub(unsigned long a, unsigned long b) 121 { 122 BUG_ON(time_after(b, a)); 123 return (long)a - (long)b; 124 } 125 126 /* 127 * per-filesystem client state 128 * 129 * possibly shared by multiple mount points, if they are 130 * mounting the same ceph filesystem/cluster. 131 */ 132 struct ceph_client { 133 struct ceph_fsid fsid; 134 bool have_fsid; 135 136 struct mutex mount_mutex; /* serialize mount attempts */ 137 struct ceph_mount_args *mount_args; 138 139 struct super_block *sb; 140 141 unsigned long mount_state; 142 wait_queue_head_t auth_wq; 143 144 int auth_err; 145 146 int min_caps; /* min caps i added */ 147 148 struct ceph_messenger *msgr; /* messenger instance */ 149 struct ceph_mon_client monc; 150 struct ceph_mds_client mdsc; 151 struct ceph_osd_client osdc; 152 153 /* writeback */ 154 mempool_t *wb_pagevec_pool; 155 struct workqueue_struct *wb_wq; 156 struct workqueue_struct *pg_inv_wq; 157 struct workqueue_struct *trunc_wq; 158 atomic_long_t writeback_count; 159 160 struct backing_dev_info backing_dev_info; 161 162 #ifdef CONFIG_DEBUG_FS 163 struct dentry *debugfs_monmap; 164 struct dentry *debugfs_mdsmap, *debugfs_osdmap; 165 struct dentry *debugfs_dir, *debugfs_dentry_lru, *debugfs_caps; 166 struct dentry *debugfs_congestion_kb; 167 struct dentry *debugfs_bdi; 168 #endif 169 }; 170 171 /* 172 * File i/o capability. This tracks shared state with the metadata 173 * server that allows us to cache or writeback attributes or to read 174 * and write data. For any given inode, we should have one or more 175 * capabilities, one issued by each metadata server, and our 176 * cumulative access is the OR of all issued capabilities. 177 * 178 * Each cap is referenced by the inode's i_caps rbtree and by per-mds 179 * session capability lists. 180 */ 181 struct ceph_cap { 182 struct ceph_inode_info *ci; 183 struct rb_node ci_node; /* per-ci cap tree */ 184 struct ceph_mds_session *session; 185 struct list_head session_caps; /* per-session caplist */ 186 int mds; 187 u64 cap_id; /* unique cap id (mds provided) */ 188 int issued; /* latest, from the mds */ 189 int implemented; /* implemented superset of issued (for revocation) */ 190 int mds_wanted; 191 u32 seq, issue_seq, mseq; 192 u32 cap_gen; /* active/stale cycle */ 193 unsigned long last_used; 194 struct list_head caps_item; 195 }; 196 197 #define CHECK_CAPS_NODELAY 1 /* do not delay any further */ 198 #define CHECK_CAPS_AUTHONLY 2 /* only check auth cap */ 199 #define CHECK_CAPS_FLUSH 4 /* flush any dirty caps */ 200 201 /* 202 * Snapped cap state that is pending flush to mds. When a snapshot occurs, 203 * we first complete any in-process sync writes and writeback any dirty 204 * data before flushing the snapped state (tracked here) back to the MDS. 205 */ 206 struct ceph_cap_snap { 207 atomic_t nref; 208 struct ceph_inode_info *ci; 209 struct list_head ci_item, flushing_item; 210 211 u64 follows, flush_tid; 212 int issued, dirty; 213 struct ceph_snap_context *context; 214 215 mode_t mode; 216 uid_t uid; 217 gid_t gid; 218 219 struct ceph_buffer *xattr_blob; 220 u64 xattr_version; 221 222 u64 size; 223 struct timespec mtime, atime, ctime; 224 u64 time_warp_seq; 225 int writing; /* a sync write is still in progress */ 226 int dirty_pages; /* dirty pages awaiting writeback */ 227 }; 228 229 static inline void ceph_put_cap_snap(struct ceph_cap_snap *capsnap) 230 { 231 if (atomic_dec_and_test(&capsnap->nref)) { 232 if (capsnap->xattr_blob) 233 ceph_buffer_put(capsnap->xattr_blob); 234 kfree(capsnap); 235 } 236 } 237 238 /* 239 * The frag tree describes how a directory is fragmented, potentially across 240 * multiple metadata servers. It is also used to indicate points where 241 * metadata authority is delegated, and whether/where metadata is replicated. 242 * 243 * A _leaf_ frag will be present in the i_fragtree IFF there is 244 * delegation info. That is, if mds >= 0 || ndist > 0. 245 */ 246 #define CEPH_MAX_DIRFRAG_REP 4 247 248 struct ceph_inode_frag { 249 struct rb_node node; 250 251 /* fragtree state */ 252 u32 frag; 253 int split_by; /* i.e. 2^(split_by) children */ 254 255 /* delegation and replication info */ 256 int mds; /* -1 if same authority as parent */ 257 int ndist; /* >0 if replicated */ 258 int dist[CEPH_MAX_DIRFRAG_REP]; 259 }; 260 261 /* 262 * We cache inode xattrs as an encoded blob until they are first used, 263 * at which point we parse them into an rbtree. 264 */ 265 struct ceph_inode_xattr { 266 struct rb_node node; 267 268 const char *name; 269 int name_len; 270 const char *val; 271 int val_len; 272 int dirty; 273 274 int should_free_name; 275 int should_free_val; 276 }; 277 278 struct ceph_inode_xattrs_info { 279 /* 280 * (still encoded) xattr blob. we avoid the overhead of parsing 281 * this until someone actually calls getxattr, etc. 282 * 283 * blob->vec.iov_len == 4 implies there are no xattrs; blob == 284 * NULL means we don't know. 285 */ 286 struct ceph_buffer *blob, *prealloc_blob; 287 288 struct rb_root index; 289 bool dirty; 290 int count; 291 int names_size; 292 int vals_size; 293 u64 version, index_version; 294 }; 295 296 /* 297 * Ceph inode. 298 */ 299 #define CEPH_I_COMPLETE 1 /* we have complete directory cached */ 300 #define CEPH_I_NODELAY 4 /* do not delay cap release */ 301 #define CEPH_I_FLUSH 8 /* do not delay flush of dirty metadata */ 302 #define CEPH_I_NOFLUSH 16 /* do not flush dirty caps */ 303 304 struct ceph_inode_info { 305 struct ceph_vino i_vino; /* ceph ino + snap */ 306 307 u64 i_version; 308 u32 i_time_warp_seq; 309 310 unsigned i_ceph_flags; 311 unsigned long i_release_count; 312 313 struct ceph_file_layout i_layout; 314 char *i_symlink; 315 316 /* for dirs */ 317 struct timespec i_rctime; 318 u64 i_rbytes, i_rfiles, i_rsubdirs; 319 u64 i_files, i_subdirs; 320 u64 i_max_offset; /* largest readdir offset, set with I_COMPLETE */ 321 322 struct rb_root i_fragtree; 323 struct mutex i_fragtree_mutex; 324 325 struct ceph_inode_xattrs_info i_xattrs; 326 327 /* capabilities. protected _both_ by i_lock and cap->session's 328 * s_mutex. */ 329 struct rb_root i_caps; /* cap list */ 330 struct ceph_cap *i_auth_cap; /* authoritative cap, if any */ 331 unsigned i_dirty_caps, i_flushing_caps; /* mask of dirtied fields */ 332 struct list_head i_dirty_item, i_flushing_item; 333 u64 i_cap_flush_seq; 334 /* we need to track cap writeback on a per-cap-bit basis, to allow 335 * overlapping, pipelined cap flushes to the mds. we can probably 336 * reduce the tid to 8 bits if we're concerned about inode size. */ 337 u16 i_cap_flush_last_tid, i_cap_flush_tid[CEPH_CAP_BITS]; 338 wait_queue_head_t i_cap_wq; /* threads waiting on a capability */ 339 unsigned long i_hold_caps_min; /* jiffies */ 340 unsigned long i_hold_caps_max; /* jiffies */ 341 struct list_head i_cap_delay_list; /* for delayed cap release to mds */ 342 int i_cap_exporting_mds; /* to handle cap migration between */ 343 unsigned i_cap_exporting_mseq; /* mds's. */ 344 unsigned i_cap_exporting_issued; 345 struct ceph_cap_reservation i_cap_migration_resv; 346 struct list_head i_cap_snaps; /* snapped state pending flush to mds */ 347 struct ceph_snap_context *i_head_snapc; /* set if wr_buffer_head > 0 or 348 dirty|flushing caps */ 349 unsigned i_snap_caps; /* cap bits for snapped files */ 350 351 int i_nr_by_mode[CEPH_FILE_MODE_NUM]; /* open file counts */ 352 353 u32 i_truncate_seq; /* last truncate to smaller size */ 354 u64 i_truncate_size; /* and the size we last truncated down to */ 355 int i_truncate_pending; /* still need to call vmtruncate */ 356 357 u64 i_max_size; /* max file size authorized by mds */ 358 u64 i_reported_size; /* (max_)size reported to or requested of mds */ 359 u64 i_wanted_max_size; /* offset we'd like to write too */ 360 u64 i_requested_max_size; /* max_size we've requested */ 361 362 /* held references to caps */ 363 int i_pin_ref; 364 int i_rd_ref, i_rdcache_ref, i_wr_ref; 365 int i_wrbuffer_ref, i_wrbuffer_ref_head; 366 u32 i_shared_gen; /* increment each time we get FILE_SHARED */ 367 u32 i_rdcache_gen; /* we increment this each time we get 368 FILE_CACHE. If it's non-zero, we 369 _may_ have cached pages. */ 370 u32 i_rdcache_revoking; /* RDCACHE gen to async invalidate, if any */ 371 372 struct list_head i_unsafe_writes; /* uncommitted sync writes */ 373 struct list_head i_unsafe_dirops; /* uncommitted mds dir ops */ 374 spinlock_t i_unsafe_lock; 375 376 struct ceph_snap_realm *i_snap_realm; /* snap realm (if caps) */ 377 int i_snap_realm_counter; /* snap realm (if caps) */ 378 struct list_head i_snap_realm_item; 379 struct list_head i_snap_flush_item; 380 381 struct work_struct i_wb_work; /* writeback work */ 382 struct work_struct i_pg_inv_work; /* page invalidation work */ 383 384 struct work_struct i_vmtruncate_work; 385 386 struct inode vfs_inode; /* at end */ 387 }; 388 389 static inline struct ceph_inode_info *ceph_inode(struct inode *inode) 390 { 391 return container_of(inode, struct ceph_inode_info, vfs_inode); 392 } 393 394 static inline void ceph_i_clear(struct inode *inode, unsigned mask) 395 { 396 struct ceph_inode_info *ci = ceph_inode(inode); 397 398 spin_lock(&inode->i_lock); 399 ci->i_ceph_flags &= ~mask; 400 spin_unlock(&inode->i_lock); 401 } 402 403 static inline void ceph_i_set(struct inode *inode, unsigned mask) 404 { 405 struct ceph_inode_info *ci = ceph_inode(inode); 406 407 spin_lock(&inode->i_lock); 408 ci->i_ceph_flags |= mask; 409 spin_unlock(&inode->i_lock); 410 } 411 412 static inline bool ceph_i_test(struct inode *inode, unsigned mask) 413 { 414 struct ceph_inode_info *ci = ceph_inode(inode); 415 bool r; 416 417 smp_mb(); 418 r = (ci->i_ceph_flags & mask) == mask; 419 return r; 420 } 421 422 423 /* find a specific frag @f */ 424 extern struct ceph_inode_frag *__ceph_find_frag(struct ceph_inode_info *ci, 425 u32 f); 426 427 /* 428 * choose fragment for value @v. copy frag content to pfrag, if leaf 429 * exists 430 */ 431 extern u32 ceph_choose_frag(struct ceph_inode_info *ci, u32 v, 432 struct ceph_inode_frag *pfrag, 433 int *found); 434 435 /* 436 * Ceph dentry state 437 */ 438 struct ceph_dentry_info { 439 struct ceph_mds_session *lease_session; 440 u32 lease_gen, lease_shared_gen; 441 u32 lease_seq; 442 unsigned long lease_renew_after, lease_renew_from; 443 struct list_head lru; 444 struct dentry *dentry; 445 u64 time; 446 u64 offset; 447 }; 448 449 static inline struct ceph_dentry_info *ceph_dentry(struct dentry *dentry) 450 { 451 return (struct ceph_dentry_info *)dentry->d_fsdata; 452 } 453 454 static inline loff_t ceph_make_fpos(unsigned frag, unsigned off) 455 { 456 return ((loff_t)frag << 32) | (loff_t)off; 457 } 458 459 /* 460 * ino_t is <64 bits on many architectures, blech. 461 * 462 * don't include snap in ino hash, at least for now. 463 */ 464 static inline ino_t ceph_vino_to_ino(struct ceph_vino vino) 465 { 466 ino_t ino = (ino_t)vino.ino; /* ^ (vino.snap << 20); */ 467 #if BITS_PER_LONG == 32 468 ino ^= vino.ino >> (sizeof(u64)-sizeof(ino_t)) * 8; 469 if (!ino) 470 ino = 1; 471 #endif 472 return ino; 473 } 474 475 static inline int ceph_set_ino_cb(struct inode *inode, void *data) 476 { 477 ceph_inode(inode)->i_vino = *(struct ceph_vino *)data; 478 inode->i_ino = ceph_vino_to_ino(*(struct ceph_vino *)data); 479 return 0; 480 } 481 482 static inline struct ceph_vino ceph_vino(struct inode *inode) 483 { 484 return ceph_inode(inode)->i_vino; 485 } 486 487 /* for printf-style formatting */ 488 #define ceph_vinop(i) ceph_inode(i)->i_vino.ino, ceph_inode(i)->i_vino.snap 489 490 static inline u64 ceph_ino(struct inode *inode) 491 { 492 return ceph_inode(inode)->i_vino.ino; 493 } 494 static inline u64 ceph_snap(struct inode *inode) 495 { 496 return ceph_inode(inode)->i_vino.snap; 497 } 498 499 static inline int ceph_ino_compare(struct inode *inode, void *data) 500 { 501 struct ceph_vino *pvino = (struct ceph_vino *)data; 502 struct ceph_inode_info *ci = ceph_inode(inode); 503 return ci->i_vino.ino == pvino->ino && 504 ci->i_vino.snap == pvino->snap; 505 } 506 507 static inline struct inode *ceph_find_inode(struct super_block *sb, 508 struct ceph_vino vino) 509 { 510 ino_t t = ceph_vino_to_ino(vino); 511 return ilookup5(sb, t, ceph_ino_compare, &vino); 512 } 513 514 515 /* 516 * caps helpers 517 */ 518 static inline bool __ceph_is_any_real_caps(struct ceph_inode_info *ci) 519 { 520 return !RB_EMPTY_ROOT(&ci->i_caps); 521 } 522 523 extern int __ceph_caps_issued(struct ceph_inode_info *ci, int *implemented); 524 extern int __ceph_caps_issued_mask(struct ceph_inode_info *ci, int mask, int t); 525 extern int __ceph_caps_issued_other(struct ceph_inode_info *ci, 526 struct ceph_cap *cap); 527 528 static inline int ceph_caps_issued(struct ceph_inode_info *ci) 529 { 530 int issued; 531 spin_lock(&ci->vfs_inode.i_lock); 532 issued = __ceph_caps_issued(ci, NULL); 533 spin_unlock(&ci->vfs_inode.i_lock); 534 return issued; 535 } 536 537 static inline int ceph_caps_issued_mask(struct ceph_inode_info *ci, int mask, 538 int touch) 539 { 540 int r; 541 spin_lock(&ci->vfs_inode.i_lock); 542 r = __ceph_caps_issued_mask(ci, mask, touch); 543 spin_unlock(&ci->vfs_inode.i_lock); 544 return r; 545 } 546 547 static inline int __ceph_caps_dirty(struct ceph_inode_info *ci) 548 { 549 return ci->i_dirty_caps | ci->i_flushing_caps; 550 } 551 extern void __ceph_mark_dirty_caps(struct ceph_inode_info *ci, int mask); 552 553 extern int ceph_caps_revoking(struct ceph_inode_info *ci, int mask); 554 extern int __ceph_caps_used(struct ceph_inode_info *ci); 555 556 extern int __ceph_caps_file_wanted(struct ceph_inode_info *ci); 557 558 /* 559 * wanted, by virtue of open file modes AND cap refs (buffered/cached data) 560 */ 561 static inline int __ceph_caps_wanted(struct ceph_inode_info *ci) 562 { 563 int w = __ceph_caps_file_wanted(ci) | __ceph_caps_used(ci); 564 if (w & CEPH_CAP_FILE_BUFFER) 565 w |= CEPH_CAP_FILE_EXCL; /* we want EXCL if dirty data */ 566 return w; 567 } 568 569 /* what the mds thinks we want */ 570 extern int __ceph_caps_mds_wanted(struct ceph_inode_info *ci); 571 572 extern void ceph_caps_init(struct ceph_mds_client *mdsc); 573 extern void ceph_caps_finalize(struct ceph_mds_client *mdsc); 574 extern void ceph_adjust_min_caps(struct ceph_mds_client *mdsc, int delta); 575 extern int ceph_reserve_caps(struct ceph_mds_client *mdsc, 576 struct ceph_cap_reservation *ctx, int need); 577 extern int ceph_unreserve_caps(struct ceph_mds_client *mdsc, 578 struct ceph_cap_reservation *ctx); 579 extern void ceph_reservation_status(struct ceph_client *client, 580 int *total, int *avail, int *used, 581 int *reserved, int *min); 582 583 static inline struct ceph_client *ceph_inode_to_client(struct inode *inode) 584 { 585 return (struct ceph_client *)inode->i_sb->s_fs_info; 586 } 587 588 static inline struct ceph_client *ceph_sb_to_client(struct super_block *sb) 589 { 590 return (struct ceph_client *)sb->s_fs_info; 591 } 592 593 594 /* 595 * we keep buffered readdir results attached to file->private_data 596 */ 597 struct ceph_file_info { 598 int fmode; /* initialized on open */ 599 600 /* readdir: position within the dir */ 601 u32 frag; 602 struct ceph_mds_request *last_readdir; 603 int at_end; 604 605 /* readdir: position within a frag */ 606 unsigned offset; /* offset of last chunk, adjusted for . and .. */ 607 u64 next_offset; /* offset of next chunk (last_name's + 1) */ 608 char *last_name; /* last entry in previous chunk */ 609 struct dentry *dentry; /* next dentry (for dcache readdir) */ 610 unsigned long dir_release_count; 611 612 /* used for -o dirstat read() on directory thing */ 613 char *dir_info; 614 int dir_info_len; 615 }; 616 617 618 619 /* 620 * snapshots 621 */ 622 623 /* 624 * A "snap context" is the set of existing snapshots when we 625 * write data. It is used by the OSD to guide its COW behavior. 626 * 627 * The ceph_snap_context is refcounted, and attached to each dirty 628 * page, indicating which context the dirty data belonged when it was 629 * dirtied. 630 */ 631 struct ceph_snap_context { 632 atomic_t nref; 633 u64 seq; 634 int num_snaps; 635 u64 snaps[]; 636 }; 637 638 static inline struct ceph_snap_context * 639 ceph_get_snap_context(struct ceph_snap_context *sc) 640 { 641 /* 642 printk("get_snap_context %p %d -> %d\n", sc, atomic_read(&sc->nref), 643 atomic_read(&sc->nref)+1); 644 */ 645 if (sc) 646 atomic_inc(&sc->nref); 647 return sc; 648 } 649 650 static inline void ceph_put_snap_context(struct ceph_snap_context *sc) 651 { 652 if (!sc) 653 return; 654 /* 655 printk("put_snap_context %p %d -> %d\n", sc, atomic_read(&sc->nref), 656 atomic_read(&sc->nref)-1); 657 */ 658 if (atomic_dec_and_test(&sc->nref)) { 659 /*printk(" deleting snap_context %p\n", sc);*/ 660 kfree(sc); 661 } 662 } 663 664 /* 665 * A "snap realm" describes a subset of the file hierarchy sharing 666 * the same set of snapshots that apply to it. The realms themselves 667 * are organized into a hierarchy, such that children inherit (some of) 668 * the snapshots of their parents. 669 * 670 * All inodes within the realm that have capabilities are linked into a 671 * per-realm list. 672 */ 673 struct ceph_snap_realm { 674 u64 ino; 675 atomic_t nref; 676 struct rb_node node; 677 678 u64 created, seq; 679 u64 parent_ino; 680 u64 parent_since; /* snapid when our current parent became so */ 681 682 u64 *prior_parent_snaps; /* snaps inherited from any parents we */ 683 int num_prior_parent_snaps; /* had prior to parent_since */ 684 u64 *snaps; /* snaps specific to this realm */ 685 int num_snaps; 686 687 struct ceph_snap_realm *parent; 688 struct list_head children; /* list of child realms */ 689 struct list_head child_item; 690 691 struct list_head empty_item; /* if i have ref==0 */ 692 693 struct list_head dirty_item; /* if realm needs new context */ 694 695 /* the current set of snaps for this realm */ 696 struct ceph_snap_context *cached_context; 697 698 struct list_head inodes_with_caps; 699 spinlock_t inodes_with_caps_lock; 700 }; 701 702 703 704 /* 705 * calculate the number of pages a given length and offset map onto, 706 * if we align the data. 707 */ 708 static inline int calc_pages_for(u64 off, u64 len) 709 { 710 return ((off+len+PAGE_CACHE_SIZE-1) >> PAGE_CACHE_SHIFT) - 711 (off >> PAGE_CACHE_SHIFT); 712 } 713 714 715 716 /* snap.c */ 717 struct ceph_snap_realm *ceph_lookup_snap_realm(struct ceph_mds_client *mdsc, 718 u64 ino); 719 extern void ceph_get_snap_realm(struct ceph_mds_client *mdsc, 720 struct ceph_snap_realm *realm); 721 extern void ceph_put_snap_realm(struct ceph_mds_client *mdsc, 722 struct ceph_snap_realm *realm); 723 extern int ceph_update_snap_trace(struct ceph_mds_client *m, 724 void *p, void *e, bool deletion); 725 extern void ceph_handle_snap(struct ceph_mds_client *mdsc, 726 struct ceph_mds_session *session, 727 struct ceph_msg *msg); 728 extern void ceph_queue_cap_snap(struct ceph_inode_info *ci); 729 extern int __ceph_finish_cap_snap(struct ceph_inode_info *ci, 730 struct ceph_cap_snap *capsnap); 731 extern void ceph_cleanup_empty_realms(struct ceph_mds_client *mdsc); 732 733 /* 734 * a cap_snap is "pending" if it is still awaiting an in-progress 735 * sync write (that may/may not still update size, mtime, etc.). 736 */ 737 static inline bool __ceph_have_pending_cap_snap(struct ceph_inode_info *ci) 738 { 739 return !list_empty(&ci->i_cap_snaps) && 740 list_entry(ci->i_cap_snaps.prev, struct ceph_cap_snap, 741 ci_item)->writing; 742 } 743 744 745 /* super.c */ 746 extern struct kmem_cache *ceph_inode_cachep; 747 extern struct kmem_cache *ceph_cap_cachep; 748 extern struct kmem_cache *ceph_dentry_cachep; 749 extern struct kmem_cache *ceph_file_cachep; 750 751 extern const char *ceph_msg_type_name(int type); 752 extern int ceph_check_fsid(struct ceph_client *client, struct ceph_fsid *fsid); 753 754 /* inode.c */ 755 extern const struct inode_operations ceph_file_iops; 756 757 extern struct inode *ceph_alloc_inode(struct super_block *sb); 758 extern void ceph_destroy_inode(struct inode *inode); 759 760 extern struct inode *ceph_get_inode(struct super_block *sb, 761 struct ceph_vino vino); 762 extern struct inode *ceph_get_snapdir(struct inode *parent); 763 extern int ceph_fill_file_size(struct inode *inode, int issued, 764 u32 truncate_seq, u64 truncate_size, u64 size); 765 extern void ceph_fill_file_time(struct inode *inode, int issued, 766 u64 time_warp_seq, struct timespec *ctime, 767 struct timespec *mtime, struct timespec *atime); 768 extern int ceph_fill_trace(struct super_block *sb, 769 struct ceph_mds_request *req, 770 struct ceph_mds_session *session); 771 extern int ceph_readdir_prepopulate(struct ceph_mds_request *req, 772 struct ceph_mds_session *session); 773 774 extern int ceph_inode_holds_cap(struct inode *inode, int mask); 775 776 extern int ceph_inode_set_size(struct inode *inode, loff_t size); 777 extern void __ceph_do_pending_vmtruncate(struct inode *inode); 778 extern void ceph_queue_vmtruncate(struct inode *inode); 779 780 extern void ceph_queue_invalidate(struct inode *inode); 781 extern void ceph_queue_writeback(struct inode *inode); 782 783 extern int ceph_do_getattr(struct inode *inode, int mask); 784 extern int ceph_permission(struct inode *inode, int mask); 785 extern int ceph_setattr(struct dentry *dentry, struct iattr *attr); 786 extern int ceph_getattr(struct vfsmount *mnt, struct dentry *dentry, 787 struct kstat *stat); 788 789 /* xattr.c */ 790 extern int ceph_setxattr(struct dentry *, const char *, const void *, 791 size_t, int); 792 extern ssize_t ceph_getxattr(struct dentry *, const char *, void *, size_t); 793 extern ssize_t ceph_listxattr(struct dentry *, char *, size_t); 794 extern int ceph_removexattr(struct dentry *, const char *); 795 extern void __ceph_build_xattrs_blob(struct ceph_inode_info *ci); 796 extern void __ceph_destroy_xattrs(struct ceph_inode_info *ci); 797 798 /* caps.c */ 799 extern const char *ceph_cap_string(int c); 800 extern void ceph_handle_caps(struct ceph_mds_session *session, 801 struct ceph_msg *msg); 802 extern int ceph_add_cap(struct inode *inode, 803 struct ceph_mds_session *session, u64 cap_id, 804 int fmode, unsigned issued, unsigned wanted, 805 unsigned cap, unsigned seq, u64 realmino, int flags, 806 struct ceph_cap_reservation *caps_reservation); 807 extern void __ceph_remove_cap(struct ceph_cap *cap); 808 static inline void ceph_remove_cap(struct ceph_cap *cap) 809 { 810 struct inode *inode = &cap->ci->vfs_inode; 811 spin_lock(&inode->i_lock); 812 __ceph_remove_cap(cap); 813 spin_unlock(&inode->i_lock); 814 } 815 extern void ceph_put_cap(struct ceph_mds_client *mdsc, 816 struct ceph_cap *cap); 817 818 extern void ceph_queue_caps_release(struct inode *inode); 819 extern int ceph_write_inode(struct inode *inode, struct writeback_control *wbc); 820 extern int ceph_fsync(struct file *file, int datasync); 821 extern void ceph_kick_flushing_caps(struct ceph_mds_client *mdsc, 822 struct ceph_mds_session *session); 823 extern struct ceph_cap *ceph_get_cap_for_mds(struct ceph_inode_info *ci, 824 int mds); 825 extern int ceph_get_cap_mds(struct inode *inode); 826 extern void ceph_get_cap_refs(struct ceph_inode_info *ci, int caps); 827 extern void ceph_put_cap_refs(struct ceph_inode_info *ci, int had); 828 extern void ceph_put_wrbuffer_cap_refs(struct ceph_inode_info *ci, int nr, 829 struct ceph_snap_context *snapc); 830 extern void __ceph_flush_snaps(struct ceph_inode_info *ci, 831 struct ceph_mds_session **psession, 832 int again); 833 extern void ceph_check_caps(struct ceph_inode_info *ci, int flags, 834 struct ceph_mds_session *session); 835 extern void ceph_check_delayed_caps(struct ceph_mds_client *mdsc); 836 extern void ceph_flush_dirty_caps(struct ceph_mds_client *mdsc); 837 838 extern int ceph_encode_inode_release(void **p, struct inode *inode, 839 int mds, int drop, int unless, int force); 840 extern int ceph_encode_dentry_release(void **p, struct dentry *dn, 841 int mds, int drop, int unless); 842 843 extern int ceph_get_caps(struct ceph_inode_info *ci, int need, int want, 844 int *got, loff_t endoff); 845 846 /* for counting open files by mode */ 847 static inline void __ceph_get_fmode(struct ceph_inode_info *ci, int mode) 848 { 849 ci->i_nr_by_mode[mode]++; 850 } 851 extern void ceph_put_fmode(struct ceph_inode_info *ci, int mode); 852 853 /* addr.c */ 854 extern const struct address_space_operations ceph_aops; 855 extern int ceph_mmap(struct file *file, struct vm_area_struct *vma); 856 857 /* file.c */ 858 extern const struct file_operations ceph_file_fops; 859 extern const struct address_space_operations ceph_aops; 860 extern int ceph_open(struct inode *inode, struct file *file); 861 extern struct dentry *ceph_lookup_open(struct inode *dir, struct dentry *dentry, 862 struct nameidata *nd, int mode, 863 int locked_dir); 864 extern int ceph_release(struct inode *inode, struct file *filp); 865 extern void ceph_release_page_vector(struct page **pages, int num_pages); 866 867 /* dir.c */ 868 extern const struct file_operations ceph_dir_fops; 869 extern const struct inode_operations ceph_dir_iops; 870 extern const struct dentry_operations ceph_dentry_ops, ceph_snap_dentry_ops, 871 ceph_snapdir_dentry_ops; 872 873 extern int ceph_handle_notrace_create(struct inode *dir, struct dentry *dentry); 874 extern struct dentry *ceph_finish_lookup(struct ceph_mds_request *req, 875 struct dentry *dentry, int err); 876 877 extern void ceph_dentry_lru_add(struct dentry *dn); 878 extern void ceph_dentry_lru_touch(struct dentry *dn); 879 extern void ceph_dentry_lru_del(struct dentry *dn); 880 extern void ceph_invalidate_dentry_lease(struct dentry *dentry); 881 882 /* 883 * our d_ops vary depending on whether the inode is live, 884 * snapshotted (read-only), or a virtual ".snap" directory. 885 */ 886 int ceph_init_dentry(struct dentry *dentry); 887 888 889 /* ioctl.c */ 890 extern long ceph_ioctl(struct file *file, unsigned int cmd, unsigned long arg); 891 892 /* export.c */ 893 extern const struct export_operations ceph_export_ops; 894 895 /* debugfs.c */ 896 extern int ceph_debugfs_init(void); 897 extern void ceph_debugfs_cleanup(void); 898 extern int ceph_debugfs_client_init(struct ceph_client *client); 899 extern void ceph_debugfs_client_cleanup(struct ceph_client *client); 900 901 /* locks.c */ 902 extern int ceph_lock(struct file *file, int cmd, struct file_lock *fl); 903 extern int ceph_flock(struct file *file, int cmd, struct file_lock *fl); 904 extern void ceph_count_locks(struct inode *inode, int *p_num, int *f_num); 905 extern int ceph_encode_locks(struct inode *i, struct ceph_pagelist *p, 906 int p_locks, int f_locks); 907 extern int lock_to_ceph_filelock(struct file_lock *fl, struct ceph_filelock *c); 908 909 static inline struct inode *get_dentry_parent_inode(struct dentry *dentry) 910 { 911 if (dentry && dentry->d_parent) 912 return dentry->d_parent->d_inode; 913 914 return NULL; 915 } 916 917 #endif /* _FS_CEPH_SUPER_H */ 918