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 struct dentry *debugfs_mds_sessions; 99 #endif 100 101 #ifdef CONFIG_CEPH_FSCACHE 102 struct fscache_cookie *fscache; 103 struct workqueue_struct *revalidate_wq; 104 #endif 105 }; 106 107 108 /* 109 * File i/o capability. This tracks shared state with the metadata 110 * server that allows us to cache or writeback attributes or to read 111 * and write data. For any given inode, we should have one or more 112 * capabilities, one issued by each metadata server, and our 113 * cumulative access is the OR of all issued capabilities. 114 * 115 * Each cap is referenced by the inode's i_caps rbtree and by per-mds 116 * session capability lists. 117 */ 118 struct ceph_cap { 119 struct ceph_inode_info *ci; 120 struct rb_node ci_node; /* per-ci cap tree */ 121 struct ceph_mds_session *session; 122 struct list_head session_caps; /* per-session caplist */ 123 int mds; 124 u64 cap_id; /* unique cap id (mds provided) */ 125 int issued; /* latest, from the mds */ 126 int implemented; /* implemented superset of issued (for revocation) */ 127 int mds_wanted; 128 u32 seq, issue_seq, mseq; 129 u32 cap_gen; /* active/stale cycle */ 130 unsigned long last_used; 131 struct list_head caps_item; 132 }; 133 134 #define CHECK_CAPS_NODELAY 1 /* do not delay any further */ 135 #define CHECK_CAPS_AUTHONLY 2 /* only check auth cap */ 136 #define CHECK_CAPS_FLUSH 4 /* flush any dirty caps */ 137 138 /* 139 * Snapped cap state that is pending flush to mds. When a snapshot occurs, 140 * we first complete any in-process sync writes and writeback any dirty 141 * data before flushing the snapped state (tracked here) back to the MDS. 142 */ 143 struct ceph_cap_snap { 144 atomic_t nref; 145 struct ceph_inode_info *ci; 146 struct list_head ci_item, flushing_item; 147 148 u64 follows, flush_tid; 149 int issued, dirty; 150 struct ceph_snap_context *context; 151 152 umode_t mode; 153 kuid_t uid; 154 kgid_t gid; 155 156 struct ceph_buffer *xattr_blob; 157 u64 xattr_version; 158 159 u64 size; 160 struct timespec mtime, atime, ctime; 161 u64 time_warp_seq; 162 int writing; /* a sync write is still in progress */ 163 int dirty_pages; /* dirty pages awaiting writeback */ 164 bool inline_data; 165 }; 166 167 static inline void ceph_put_cap_snap(struct ceph_cap_snap *capsnap) 168 { 169 if (atomic_dec_and_test(&capsnap->nref)) { 170 if (capsnap->xattr_blob) 171 ceph_buffer_put(capsnap->xattr_blob); 172 kfree(capsnap); 173 } 174 } 175 176 /* 177 * The frag tree describes how a directory is fragmented, potentially across 178 * multiple metadata servers. It is also used to indicate points where 179 * metadata authority is delegated, and whether/where metadata is replicated. 180 * 181 * A _leaf_ frag will be present in the i_fragtree IFF there is 182 * delegation info. That is, if mds >= 0 || ndist > 0. 183 */ 184 #define CEPH_MAX_DIRFRAG_REP 4 185 186 struct ceph_inode_frag { 187 struct rb_node node; 188 189 /* fragtree state */ 190 u32 frag; 191 int split_by; /* i.e. 2^(split_by) children */ 192 193 /* delegation and replication info */ 194 int mds; /* -1 if same authority as parent */ 195 int ndist; /* >0 if replicated */ 196 int dist[CEPH_MAX_DIRFRAG_REP]; 197 }; 198 199 /* 200 * We cache inode xattrs as an encoded blob until they are first used, 201 * at which point we parse them into an rbtree. 202 */ 203 struct ceph_inode_xattr { 204 struct rb_node node; 205 206 const char *name; 207 int name_len; 208 const char *val; 209 int val_len; 210 int dirty; 211 212 int should_free_name; 213 int should_free_val; 214 }; 215 216 /* 217 * Ceph dentry state 218 */ 219 struct ceph_dentry_info { 220 struct ceph_mds_session *lease_session; 221 u32 lease_gen, lease_shared_gen; 222 u32 lease_seq; 223 unsigned long lease_renew_after, lease_renew_from; 224 struct list_head lru; 225 struct dentry *dentry; 226 u64 time; 227 u64 offset; 228 }; 229 230 struct ceph_inode_xattrs_info { 231 /* 232 * (still encoded) xattr blob. we avoid the overhead of parsing 233 * this until someone actually calls getxattr, etc. 234 * 235 * blob->vec.iov_len == 4 implies there are no xattrs; blob == 236 * NULL means we don't know. 237 */ 238 struct ceph_buffer *blob, *prealloc_blob; 239 240 struct rb_root index; 241 bool dirty; 242 int count; 243 int names_size; 244 int vals_size; 245 u64 version, index_version; 246 }; 247 248 /* 249 * Ceph inode. 250 */ 251 struct ceph_inode_info { 252 struct ceph_vino i_vino; /* ceph ino + snap */ 253 254 spinlock_t i_ceph_lock; 255 256 u64 i_version; 257 u64 i_inline_version; 258 u32 i_time_warp_seq; 259 260 unsigned i_ceph_flags; 261 int i_ordered_count; 262 atomic_t i_release_count; 263 atomic_t i_complete_count; 264 265 struct ceph_dir_layout i_dir_layout; 266 struct ceph_file_layout i_layout; 267 char *i_symlink; 268 269 /* for dirs */ 270 struct timespec i_rctime; 271 u64 i_rbytes, i_rfiles, i_rsubdirs; 272 u64 i_files, i_subdirs; 273 274 struct rb_root i_fragtree; 275 struct mutex i_fragtree_mutex; 276 277 struct ceph_inode_xattrs_info i_xattrs; 278 279 /* capabilities. protected _both_ by i_ceph_lock and cap->session's 280 * s_mutex. */ 281 struct rb_root i_caps; /* cap list */ 282 struct ceph_cap *i_auth_cap; /* authoritative cap, if any */ 283 unsigned i_dirty_caps, i_flushing_caps; /* mask of dirtied fields */ 284 struct list_head i_dirty_item, i_flushing_item; 285 u64 i_cap_flush_seq; 286 /* we need to track cap writeback on a per-cap-bit basis, to allow 287 * overlapping, pipelined cap flushes to the mds. we can probably 288 * reduce the tid to 8 bits if we're concerned about inode size. */ 289 u16 i_cap_flush_last_tid, i_cap_flush_tid[CEPH_CAP_BITS]; 290 wait_queue_head_t i_cap_wq; /* threads waiting on a capability */ 291 unsigned long i_hold_caps_min; /* jiffies */ 292 unsigned long i_hold_caps_max; /* jiffies */ 293 struct list_head i_cap_delay_list; /* for delayed cap release to mds */ 294 struct ceph_cap_reservation i_cap_migration_resv; 295 struct list_head i_cap_snaps; /* snapped state pending flush to mds */ 296 struct ceph_snap_context *i_head_snapc; /* set if wr_buffer_head > 0 or 297 dirty|flushing caps */ 298 unsigned i_snap_caps; /* cap bits for snapped files */ 299 300 int i_nr_by_mode[CEPH_FILE_MODE_NUM]; /* open file counts */ 301 302 struct mutex i_truncate_mutex; 303 u32 i_truncate_seq; /* last truncate to smaller size */ 304 u64 i_truncate_size; /* and the size we last truncated down to */ 305 int i_truncate_pending; /* still need to call vmtruncate */ 306 307 u64 i_max_size; /* max file size authorized by mds */ 308 u64 i_reported_size; /* (max_)size reported to or requested of mds */ 309 u64 i_wanted_max_size; /* offset we'd like to write too */ 310 u64 i_requested_max_size; /* max_size we've requested */ 311 312 /* held references to caps */ 313 int i_pin_ref; 314 int i_rd_ref, i_rdcache_ref, i_wr_ref, i_wb_ref; 315 int i_wrbuffer_ref, i_wrbuffer_ref_head; 316 u32 i_shared_gen; /* increment each time we get FILE_SHARED */ 317 u32 i_rdcache_gen; /* incremented each time we get FILE_CACHE. */ 318 u32 i_rdcache_revoking; /* RDCACHE gen to async invalidate, if any */ 319 320 struct list_head i_unsafe_writes; /* uncommitted sync writes */ 321 struct list_head i_unsafe_dirops; /* uncommitted mds dir ops */ 322 spinlock_t i_unsafe_lock; 323 324 struct ceph_snap_realm *i_snap_realm; /* snap realm (if caps) */ 325 int i_snap_realm_counter; /* snap realm (if caps) */ 326 struct list_head i_snap_realm_item; 327 struct list_head i_snap_flush_item; 328 329 struct work_struct i_wb_work; /* writeback work */ 330 struct work_struct i_pg_inv_work; /* page invalidation work */ 331 332 struct work_struct i_vmtruncate_work; 333 334 #ifdef CONFIG_CEPH_FSCACHE 335 struct fscache_cookie *fscache; 336 u32 i_fscache_gen; /* sequence, for delayed fscache validate */ 337 struct work_struct i_revalidate_work; 338 #endif 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_DIR_ORDERED 1 /* dentries in dir are ordered */ 441 #define CEPH_I_NODELAY 4 /* do not delay cap release */ 442 #define CEPH_I_FLUSH 8 /* do not delay flush of dirty metadata */ 443 #define CEPH_I_NOFLUSH 16 /* do not flush dirty caps */ 444 445 static inline void __ceph_dir_set_complete(struct ceph_inode_info *ci, 446 int release_count, int ordered_count) 447 { 448 atomic_set(&ci->i_complete_count, release_count); 449 if (ci->i_ordered_count == ordered_count) 450 ci->i_ceph_flags |= CEPH_I_DIR_ORDERED; 451 else 452 ci->i_ceph_flags &= ~CEPH_I_DIR_ORDERED; 453 } 454 455 static inline void __ceph_dir_clear_complete(struct ceph_inode_info *ci) 456 { 457 atomic_inc(&ci->i_release_count); 458 } 459 460 static inline bool __ceph_dir_is_complete(struct ceph_inode_info *ci) 461 { 462 return atomic_read(&ci->i_complete_count) == 463 atomic_read(&ci->i_release_count); 464 } 465 466 static inline bool __ceph_dir_is_complete_ordered(struct ceph_inode_info *ci) 467 { 468 return __ceph_dir_is_complete(ci) && 469 (ci->i_ceph_flags & CEPH_I_DIR_ORDERED); 470 } 471 472 static inline void ceph_dir_clear_complete(struct inode *inode) 473 { 474 __ceph_dir_clear_complete(ceph_inode(inode)); 475 } 476 477 static inline void ceph_dir_clear_ordered(struct inode *inode) 478 { 479 struct ceph_inode_info *ci = ceph_inode(inode); 480 spin_lock(&ci->i_ceph_lock); 481 ci->i_ordered_count++; 482 ci->i_ceph_flags &= ~CEPH_I_DIR_ORDERED; 483 spin_unlock(&ci->i_ceph_lock); 484 } 485 486 static inline bool ceph_dir_is_complete_ordered(struct inode *inode) 487 { 488 struct ceph_inode_info *ci = ceph_inode(inode); 489 bool ret; 490 spin_lock(&ci->i_ceph_lock); 491 ret = __ceph_dir_is_complete_ordered(ci); 492 spin_unlock(&ci->i_ceph_lock); 493 return ret; 494 } 495 496 /* find a specific frag @f */ 497 extern struct ceph_inode_frag *__ceph_find_frag(struct ceph_inode_info *ci, 498 u32 f); 499 500 /* 501 * choose fragment for value @v. copy frag content to pfrag, if leaf 502 * exists 503 */ 504 extern u32 ceph_choose_frag(struct ceph_inode_info *ci, u32 v, 505 struct ceph_inode_frag *pfrag, 506 int *found); 507 508 static inline struct ceph_dentry_info *ceph_dentry(struct dentry *dentry) 509 { 510 return (struct ceph_dentry_info *)dentry->d_fsdata; 511 } 512 513 static inline loff_t ceph_make_fpos(unsigned frag, unsigned off) 514 { 515 return ((loff_t)frag << 32) | (loff_t)off; 516 } 517 518 /* 519 * caps helpers 520 */ 521 static inline bool __ceph_is_any_real_caps(struct ceph_inode_info *ci) 522 { 523 return !RB_EMPTY_ROOT(&ci->i_caps); 524 } 525 526 extern int __ceph_caps_issued(struct ceph_inode_info *ci, int *implemented); 527 extern int __ceph_caps_issued_mask(struct ceph_inode_info *ci, int mask, int t); 528 extern int __ceph_caps_issued_other(struct ceph_inode_info *ci, 529 struct ceph_cap *cap); 530 531 static inline int ceph_caps_issued(struct ceph_inode_info *ci) 532 { 533 int issued; 534 spin_lock(&ci->i_ceph_lock); 535 issued = __ceph_caps_issued(ci, NULL); 536 spin_unlock(&ci->i_ceph_lock); 537 return issued; 538 } 539 540 static inline int ceph_caps_issued_mask(struct ceph_inode_info *ci, int mask, 541 int touch) 542 { 543 int r; 544 spin_lock(&ci->i_ceph_lock); 545 r = __ceph_caps_issued_mask(ci, mask, touch); 546 spin_unlock(&ci->i_ceph_lock); 547 return r; 548 } 549 550 static inline int __ceph_caps_dirty(struct ceph_inode_info *ci) 551 { 552 return ci->i_dirty_caps | ci->i_flushing_caps; 553 } 554 extern int __ceph_mark_dirty_caps(struct ceph_inode_info *ci, int mask); 555 556 extern int __ceph_caps_revoking_other(struct ceph_inode_info *ci, 557 struct ceph_cap *ocap, int mask); 558 extern int ceph_caps_revoking(struct ceph_inode_info *ci, int mask); 559 extern int __ceph_caps_used(struct ceph_inode_info *ci); 560 561 extern int __ceph_caps_file_wanted(struct ceph_inode_info *ci); 562 563 /* 564 * wanted, by virtue of open file modes AND cap refs (buffered/cached data) 565 */ 566 static inline int __ceph_caps_wanted(struct ceph_inode_info *ci) 567 { 568 int w = __ceph_caps_file_wanted(ci) | __ceph_caps_used(ci); 569 if (w & CEPH_CAP_FILE_BUFFER) 570 w |= CEPH_CAP_FILE_EXCL; /* we want EXCL if dirty data */ 571 return w; 572 } 573 574 /* what the mds thinks we want */ 575 extern int __ceph_caps_mds_wanted(struct ceph_inode_info *ci); 576 577 extern void ceph_caps_init(struct ceph_mds_client *mdsc); 578 extern void ceph_caps_finalize(struct ceph_mds_client *mdsc); 579 extern void ceph_adjust_min_caps(struct ceph_mds_client *mdsc, int delta); 580 extern void ceph_reserve_caps(struct ceph_mds_client *mdsc, 581 struct ceph_cap_reservation *ctx, int need); 582 extern int ceph_unreserve_caps(struct ceph_mds_client *mdsc, 583 struct ceph_cap_reservation *ctx); 584 extern void ceph_reservation_status(struct ceph_fs_client *client, 585 int *total, int *avail, int *used, 586 int *reserved, int *min); 587 588 589 590 /* 591 * we keep buffered readdir results attached to file->private_data 592 */ 593 #define CEPH_F_SYNC 1 594 #define CEPH_F_ATEND 2 595 596 struct ceph_file_info { 597 short fmode; /* initialized on open */ 598 short flags; /* CEPH_F_* */ 599 600 /* readdir: position within the dir */ 601 u32 frag; 602 struct ceph_mds_request *last_readdir; 603 604 /* readdir: position within a frag */ 605 unsigned offset; /* offset of last chunk, adjusted for . and .. */ 606 unsigned next_offset; /* offset of next chunk (last_name's + 1) */ 607 char *last_name; /* last entry in previous chunk */ 608 struct dentry *dentry; /* next dentry (for dcache readdir) */ 609 int dir_release_count; 610 int dir_ordered_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 * A "snap realm" describes a subset of the file hierarchy sharing 621 * the same set of snapshots that apply to it. The realms themselves 622 * are organized into a hierarchy, such that children inherit (some of) 623 * the snapshots of their parents. 624 * 625 * All inodes within the realm that have capabilities are linked into a 626 * per-realm list. 627 */ 628 struct ceph_snap_realm { 629 u64 ino; 630 atomic_t nref; 631 struct rb_node node; 632 633 u64 created, seq; 634 u64 parent_ino; 635 u64 parent_since; /* snapid when our current parent became so */ 636 637 u64 *prior_parent_snaps; /* snaps inherited from any parents we */ 638 u32 num_prior_parent_snaps; /* had prior to parent_since */ 639 u64 *snaps; /* snaps specific to this realm */ 640 u32 num_snaps; 641 642 struct ceph_snap_realm *parent; 643 struct list_head children; /* list of child realms */ 644 struct list_head child_item; 645 646 struct list_head empty_item; /* if i have ref==0 */ 647 648 struct list_head dirty_item; /* if realm needs new context */ 649 650 /* the current set of snaps for this realm */ 651 struct ceph_snap_context *cached_context; 652 653 struct list_head inodes_with_caps; 654 spinlock_t inodes_with_caps_lock; 655 }; 656 657 static inline int default_congestion_kb(void) 658 { 659 int congestion_kb; 660 661 /* 662 * Copied from NFS 663 * 664 * congestion size, scale with available memory. 665 * 666 * 64MB: 8192k 667 * 128MB: 11585k 668 * 256MB: 16384k 669 * 512MB: 23170k 670 * 1GB: 32768k 671 * 2GB: 46340k 672 * 4GB: 65536k 673 * 8GB: 92681k 674 * 16GB: 131072k 675 * 676 * This allows larger machines to have larger/more transfers. 677 * Limit the default to 256M 678 */ 679 congestion_kb = (16*int_sqrt(totalram_pages)) << (PAGE_SHIFT-10); 680 if (congestion_kb > 256*1024) 681 congestion_kb = 256*1024; 682 683 return congestion_kb; 684 } 685 686 687 688 /* snap.c */ 689 struct ceph_snap_realm *ceph_lookup_snap_realm(struct ceph_mds_client *mdsc, 690 u64 ino); 691 extern void ceph_get_snap_realm(struct ceph_mds_client *mdsc, 692 struct ceph_snap_realm *realm); 693 extern void ceph_put_snap_realm(struct ceph_mds_client *mdsc, 694 struct ceph_snap_realm *realm); 695 extern int ceph_update_snap_trace(struct ceph_mds_client *m, 696 void *p, void *e, bool deletion); 697 extern void ceph_handle_snap(struct ceph_mds_client *mdsc, 698 struct ceph_mds_session *session, 699 struct ceph_msg *msg); 700 extern void ceph_queue_cap_snap(struct ceph_inode_info *ci); 701 extern int __ceph_finish_cap_snap(struct ceph_inode_info *ci, 702 struct ceph_cap_snap *capsnap); 703 extern void ceph_cleanup_empty_realms(struct ceph_mds_client *mdsc); 704 extern int ceph_snap_init(void); 705 extern void ceph_snap_exit(void); 706 707 /* 708 * a cap_snap is "pending" if it is still awaiting an in-progress 709 * sync write (that may/may not still update size, mtime, etc.). 710 */ 711 static inline bool __ceph_have_pending_cap_snap(struct ceph_inode_info *ci) 712 { 713 return !list_empty(&ci->i_cap_snaps) && 714 list_entry(ci->i_cap_snaps.prev, struct ceph_cap_snap, 715 ci_item)->writing; 716 } 717 718 /* inode.c */ 719 extern const struct inode_operations ceph_file_iops; 720 721 extern struct inode *ceph_alloc_inode(struct super_block *sb); 722 extern void ceph_destroy_inode(struct inode *inode); 723 extern int ceph_drop_inode(struct inode *inode); 724 725 extern struct inode *ceph_get_inode(struct super_block *sb, 726 struct ceph_vino vino); 727 extern struct inode *ceph_get_snapdir(struct inode *parent); 728 extern int ceph_fill_file_size(struct inode *inode, int issued, 729 u32 truncate_seq, u64 truncate_size, u64 size); 730 extern void ceph_fill_file_time(struct inode *inode, int issued, 731 u64 time_warp_seq, struct timespec *ctime, 732 struct timespec *mtime, struct timespec *atime); 733 extern int ceph_fill_trace(struct super_block *sb, 734 struct ceph_mds_request *req, 735 struct ceph_mds_session *session); 736 extern int ceph_readdir_prepopulate(struct ceph_mds_request *req, 737 struct ceph_mds_session *session); 738 739 extern int ceph_inode_holds_cap(struct inode *inode, int mask); 740 741 extern int ceph_inode_set_size(struct inode *inode, loff_t size); 742 extern void __ceph_do_pending_vmtruncate(struct inode *inode); 743 extern void ceph_queue_vmtruncate(struct inode *inode); 744 745 extern void ceph_queue_invalidate(struct inode *inode); 746 extern void ceph_queue_writeback(struct inode *inode); 747 748 extern int __ceph_do_getattr(struct inode *inode, struct page *locked_page, 749 int mask, bool force); 750 static inline int ceph_do_getattr(struct inode *inode, int mask, bool force) 751 { 752 return __ceph_do_getattr(inode, NULL, mask, force); 753 } 754 extern int ceph_permission(struct inode *inode, int mask); 755 extern int ceph_setattr(struct dentry *dentry, struct iattr *attr); 756 extern int ceph_getattr(struct vfsmount *mnt, struct dentry *dentry, 757 struct kstat *stat); 758 759 /* xattr.c */ 760 extern int ceph_setxattr(struct dentry *, const char *, const void *, 761 size_t, int); 762 int __ceph_setxattr(struct dentry *, const char *, const void *, size_t, int); 763 ssize_t __ceph_getxattr(struct inode *, const char *, void *, size_t); 764 int __ceph_removexattr(struct dentry *, const char *); 765 extern ssize_t ceph_getxattr(struct dentry *, const char *, void *, size_t); 766 extern ssize_t ceph_listxattr(struct dentry *, char *, size_t); 767 extern int ceph_removexattr(struct dentry *, const char *); 768 extern void __ceph_build_xattrs_blob(struct ceph_inode_info *ci); 769 extern void __ceph_destroy_xattrs(struct ceph_inode_info *ci); 770 extern void __init ceph_xattr_init(void); 771 extern void ceph_xattr_exit(void); 772 extern const struct xattr_handler *ceph_xattr_handlers[]; 773 774 /* acl.c */ 775 struct ceph_acls_info { 776 void *default_acl; 777 void *acl; 778 struct ceph_pagelist *pagelist; 779 }; 780 781 #ifdef CONFIG_CEPH_FS_POSIX_ACL 782 783 struct posix_acl *ceph_get_acl(struct inode *, int); 784 int ceph_set_acl(struct inode *inode, struct posix_acl *acl, int type); 785 int ceph_pre_init_acls(struct inode *dir, umode_t *mode, 786 struct ceph_acls_info *info); 787 void ceph_init_inode_acls(struct inode *inode, struct ceph_acls_info *info); 788 void ceph_release_acls_info(struct ceph_acls_info *info); 789 790 static inline void ceph_forget_all_cached_acls(struct inode *inode) 791 { 792 forget_all_cached_acls(inode); 793 } 794 795 #else 796 797 #define ceph_get_acl NULL 798 #define ceph_set_acl NULL 799 800 static inline int ceph_pre_init_acls(struct inode *dir, umode_t *mode, 801 struct ceph_acls_info *info) 802 { 803 return 0; 804 } 805 static inline void ceph_init_inode_acls(struct inode *inode, 806 struct ceph_acls_info *info) 807 { 808 } 809 static inline void ceph_release_acls_info(struct ceph_acls_info *info) 810 { 811 } 812 static inline int ceph_acl_chmod(struct dentry *dentry, struct inode *inode) 813 { 814 return 0; 815 } 816 817 static inline void ceph_forget_all_cached_acls(struct inode *inode) 818 { 819 } 820 821 #endif 822 823 /* caps.c */ 824 extern const char *ceph_cap_string(int c); 825 extern void ceph_handle_caps(struct ceph_mds_session *session, 826 struct ceph_msg *msg); 827 extern struct ceph_cap *ceph_get_cap(struct ceph_mds_client *mdsc, 828 struct ceph_cap_reservation *ctx); 829 extern void ceph_add_cap(struct inode *inode, 830 struct ceph_mds_session *session, u64 cap_id, 831 int fmode, unsigned issued, unsigned wanted, 832 unsigned cap, unsigned seq, u64 realmino, int flags, 833 struct ceph_cap **new_cap); 834 extern void __ceph_remove_cap(struct ceph_cap *cap, bool queue_release); 835 extern void ceph_put_cap(struct ceph_mds_client *mdsc, 836 struct ceph_cap *cap); 837 extern int ceph_is_any_caps(struct inode *inode); 838 839 extern void __queue_cap_release(struct ceph_mds_session *session, u64 ino, 840 u64 cap_id, u32 migrate_seq, u32 issue_seq); 841 extern void ceph_queue_caps_release(struct inode *inode); 842 extern int ceph_write_inode(struct inode *inode, struct writeback_control *wbc); 843 extern int ceph_fsync(struct file *file, loff_t start, loff_t end, 844 int datasync); 845 extern void ceph_kick_flushing_caps(struct ceph_mds_client *mdsc, 846 struct ceph_mds_session *session); 847 extern struct ceph_cap *ceph_get_cap_for_mds(struct ceph_inode_info *ci, 848 int mds); 849 extern int ceph_get_cap_mds(struct inode *inode); 850 extern void ceph_get_cap_refs(struct ceph_inode_info *ci, int caps); 851 extern void ceph_put_cap_refs(struct ceph_inode_info *ci, int had); 852 extern void ceph_put_wrbuffer_cap_refs(struct ceph_inode_info *ci, int nr, 853 struct ceph_snap_context *snapc); 854 extern void __ceph_flush_snaps(struct ceph_inode_info *ci, 855 struct ceph_mds_session **psession, 856 int again); 857 extern void ceph_check_caps(struct ceph_inode_info *ci, int flags, 858 struct ceph_mds_session *session); 859 extern void ceph_check_delayed_caps(struct ceph_mds_client *mdsc); 860 extern void ceph_flush_dirty_caps(struct ceph_mds_client *mdsc); 861 862 extern int ceph_encode_inode_release(void **p, struct inode *inode, 863 int mds, int drop, int unless, int force); 864 extern int ceph_encode_dentry_release(void **p, struct dentry *dn, 865 int mds, int drop, int unless); 866 867 extern int ceph_get_caps(struct ceph_inode_info *ci, int need, int want, 868 loff_t endoff, int *got, struct page **pinned_page); 869 870 /* for counting open files by mode */ 871 static inline void __ceph_get_fmode(struct ceph_inode_info *ci, int mode) 872 { 873 ci->i_nr_by_mode[mode]++; 874 } 875 extern void ceph_put_fmode(struct ceph_inode_info *ci, int mode); 876 877 /* addr.c */ 878 extern const struct address_space_operations ceph_aops; 879 extern int ceph_mmap(struct file *file, struct vm_area_struct *vma); 880 881 /* file.c */ 882 extern const struct file_operations ceph_file_fops; 883 extern const struct address_space_operations ceph_aops; 884 885 extern int ceph_open(struct inode *inode, struct file *file); 886 extern int ceph_atomic_open(struct inode *dir, struct dentry *dentry, 887 struct file *file, unsigned flags, umode_t mode, 888 int *opened); 889 extern int ceph_release(struct inode *inode, struct file *filp); 890 extern void ceph_fill_inline_data(struct inode *inode, struct page *locked_page, 891 char *data, size_t len); 892 int ceph_uninline_data(struct file *filp, struct page *locked_page); 893 /* dir.c */ 894 extern const struct file_operations ceph_dir_fops; 895 extern const struct inode_operations ceph_dir_iops; 896 extern const struct dentry_operations ceph_dentry_ops, ceph_snap_dentry_ops, 897 ceph_snapdir_dentry_ops; 898 899 extern int ceph_handle_notrace_create(struct inode *dir, struct dentry *dentry); 900 extern int ceph_handle_snapdir(struct ceph_mds_request *req, 901 struct dentry *dentry, int err); 902 extern struct dentry *ceph_finish_lookup(struct ceph_mds_request *req, 903 struct dentry *dentry, int err); 904 905 extern void ceph_dentry_lru_add(struct dentry *dn); 906 extern void ceph_dentry_lru_touch(struct dentry *dn); 907 extern void ceph_dentry_lru_del(struct dentry *dn); 908 extern void ceph_invalidate_dentry_lease(struct dentry *dentry); 909 extern unsigned ceph_dentry_hash(struct inode *dir, struct dentry *dn); 910 extern struct inode *ceph_get_dentry_parent_inode(struct dentry *dentry); 911 912 /* 913 * our d_ops vary depending on whether the inode is live, 914 * snapshotted (read-only), or a virtual ".snap" directory. 915 */ 916 int ceph_init_dentry(struct dentry *dentry); 917 918 919 /* ioctl.c */ 920 extern long ceph_ioctl(struct file *file, unsigned int cmd, unsigned long arg); 921 922 /* export.c */ 923 extern const struct export_operations ceph_export_ops; 924 925 /* locks.c */ 926 extern __init void ceph_flock_init(void); 927 extern int ceph_lock(struct file *file, int cmd, struct file_lock *fl); 928 extern int ceph_flock(struct file *file, int cmd, struct file_lock *fl); 929 extern void ceph_count_locks(struct inode *inode, int *p_num, int *f_num); 930 extern int ceph_encode_locks_to_buffer(struct inode *inode, 931 struct ceph_filelock *flocks, 932 int num_fcntl_locks, 933 int num_flock_locks); 934 extern int ceph_locks_to_pagelist(struct ceph_filelock *flocks, 935 struct ceph_pagelist *pagelist, 936 int num_fcntl_locks, int num_flock_locks); 937 extern int lock_to_ceph_filelock(struct file_lock *fl, struct ceph_filelock *c); 938 939 /* debugfs.c */ 940 extern int ceph_fs_debugfs_init(struct ceph_fs_client *client); 941 extern void ceph_fs_debugfs_cleanup(struct ceph_fs_client *client); 942 943 #endif /* _FS_CEPH_SUPER_H */ 944