1/* 2 FUSE: Filesystem in Userspace 3 Copyright (C) 2001-2008 Miklos Szeredi <miklos@szeredi.hu> 4 5 This program can be distributed under the terms of the GNU GPL. 6 See the file COPYING. 7*/ 8 9#ifndef _FS_FUSE_I_H 10#define _FS_FUSE_I_H 11 12#include <linux/fuse.h> 13#include <linux/fs.h> 14#include <linux/mount.h> 15#include <linux/wait.h> 16#include <linux/list.h> 17#include <linux/spinlock.h> 18#include <linux/mm.h> 19#include <linux/backing-dev.h> 20#include <linux/mutex.h> 21#include <linux/rwsem.h> 22#include <linux/rbtree.h> 23#include <linux/poll.h> 24#include <linux/workqueue.h> 25#include <linux/kref.h> 26 27/** Max number of pages that can be used in a single read request */ 28#define FUSE_MAX_PAGES_PER_REQ 32 29 30/** Bias for fi->writectr, meaning new writepages must not be sent */ 31#define FUSE_NOWRITE INT_MIN 32 33/** It could be as large as PATH_MAX, but would that have any uses? */ 34#define FUSE_NAME_MAX 1024 35 36/** Number of dentries for each connection in the control filesystem */ 37#define FUSE_CTL_NUM_DENTRIES 5 38 39/** If the FUSE_DEFAULT_PERMISSIONS flag is given, the filesystem 40 module will check permissions based on the file mode. Otherwise no 41 permission checking is done in the kernel */ 42#define FUSE_DEFAULT_PERMISSIONS (1 << 0) 43 44/** If the FUSE_ALLOW_OTHER flag is given, then not only the user 45 doing the mount will be allowed to access the filesystem */ 46#define FUSE_ALLOW_OTHER (1 << 1) 47 48/** Number of page pointers embedded in fuse_req */ 49#define FUSE_REQ_INLINE_PAGES 1 50 51/** List of active connections */ 52extern struct list_head fuse_conn_list; 53 54/** Global mutex protecting fuse_conn_list and the control filesystem */ 55extern struct mutex fuse_mutex; 56 57/** Module parameters */ 58extern unsigned max_user_bgreq; 59extern unsigned max_user_congthresh; 60 61/* One forget request */ 62struct fuse_forget_link { 63 struct fuse_forget_one forget_one; 64 struct fuse_forget_link *next; 65}; 66 67/** FUSE inode */ 68struct fuse_inode { 69 /** Inode data */ 70 struct inode inode; 71 72 /** Unique ID, which identifies the inode between userspace 73 * and kernel */ 74 u64 nodeid; 75 76 /** Number of lookups on this inode */ 77 u64 nlookup; 78 79 /** The request used for sending the FORGET message */ 80 struct fuse_forget_link *forget; 81 82 /** Time in jiffies until the file attributes are valid */ 83 u64 i_time; 84 85 /** The sticky bit in inode->i_mode may have been removed, so 86 preserve the original mode */ 87 umode_t orig_i_mode; 88 89 /** 64 bit inode number */ 90 u64 orig_ino; 91 92 /** Version of last attribute change */ 93 u64 attr_version; 94 95 /** Files usable in writepage. Protected by fc->lock */ 96 struct list_head write_files; 97 98 /** Writepages pending on truncate or fsync */ 99 struct list_head queued_writes; 100 101 /** Number of sent writes, a negative bias (FUSE_NOWRITE) 102 * means more writes are blocked */ 103 int writectr; 104 105 /** Waitq for writepage completion */ 106 wait_queue_head_t page_waitq; 107 108 /** List of writepage requestst (pending or sent) */ 109 struct list_head writepages; 110 111 /** Miscellaneous bits describing inode state */ 112 unsigned long state; 113}; 114 115/** FUSE inode state bits */ 116enum { 117 /** Advise readdirplus */ 118 FUSE_I_ADVISE_RDPLUS, 119 /** Initialized with readdirplus */ 120 FUSE_I_INIT_RDPLUS, 121 /** An operation changing file size is in progress */ 122 FUSE_I_SIZE_UNSTABLE, 123}; 124 125struct fuse_conn; 126 127/** FUSE specific file data */ 128struct fuse_file { 129 /** Fuse connection for this file */ 130 struct fuse_conn *fc; 131 132 /** Request reserved for flush and release */ 133 struct fuse_req *reserved_req; 134 135 /** Kernel file handle guaranteed to be unique */ 136 u64 kh; 137 138 /** File handle used by userspace */ 139 u64 fh; 140 141 /** Node id of this file */ 142 u64 nodeid; 143 144 /** Refcount */ 145 atomic_t count; 146 147 /** FOPEN_* flags returned by open */ 148 u32 open_flags; 149 150 /** Entry on inode's write_files list */ 151 struct list_head write_entry; 152 153 /** RB node to be linked on fuse_conn->polled_files */ 154 struct rb_node polled_node; 155 156 /** Wait queue head for poll */ 157 wait_queue_head_t poll_wait; 158 159 /** Has flock been performed on this file? */ 160 bool flock:1; 161}; 162 163/** One input argument of a request */ 164struct fuse_in_arg { 165 unsigned size; 166 const void *value; 167}; 168 169/** The request input */ 170struct fuse_in { 171 /** The request header */ 172 struct fuse_in_header h; 173 174 /** True if the data for the last argument is in req->pages */ 175 unsigned argpages:1; 176 177 /** Number of arguments */ 178 unsigned numargs; 179 180 /** Array of arguments */ 181 struct fuse_in_arg args[3]; 182}; 183 184/** One output argument of a request */ 185struct fuse_arg { 186 unsigned size; 187 void *value; 188}; 189 190/** The request output */ 191struct fuse_out { 192 /** Header returned from userspace */ 193 struct fuse_out_header h; 194 195 /* 196 * The following bitfields are not changed during the request 197 * processing 198 */ 199 200 /** Last argument is variable length (can be shorter than 201 arg->size) */ 202 unsigned argvar:1; 203 204 /** Last argument is a list of pages to copy data to */ 205 unsigned argpages:1; 206 207 /** Zero partially or not copied pages */ 208 unsigned page_zeroing:1; 209 210 /** Pages may be replaced with new ones */ 211 unsigned page_replace:1; 212 213 /** Number or arguments */ 214 unsigned numargs; 215 216 /** Array of arguments */ 217 struct fuse_arg args[2]; 218}; 219 220/** FUSE page descriptor */ 221struct fuse_page_desc { 222 unsigned int length; 223 unsigned int offset; 224}; 225 226struct fuse_args { 227 struct { 228 struct { 229 uint32_t opcode; 230 uint64_t nodeid; 231 } h; 232 unsigned numargs; 233 struct fuse_in_arg args[3]; 234 235 } in; 236 struct { 237 unsigned argvar:1; 238 unsigned numargs; 239 struct fuse_arg args[2]; 240 } out; 241}; 242 243#define FUSE_ARGS(args) struct fuse_args args = {} 244 245/** The request IO state (for asynchronous processing) */ 246struct fuse_io_priv { 247 struct kref refcnt; 248 int async; 249 spinlock_t lock; 250 unsigned reqs; 251 ssize_t bytes; 252 size_t size; 253 __u64 offset; 254 bool write; 255 int err; 256 struct kiocb *iocb; 257 struct file *file; 258 struct completion *done; 259}; 260 261#define FUSE_IO_PRIV_SYNC(f) \ 262{ \ 263 .refcnt = { ATOMIC_INIT(1) }, \ 264 .async = 0, \ 265 .file = f, \ 266} 267 268/** 269 * Request flags 270 * 271 * FR_ISREPLY: set if the request has reply 272 * FR_FORCE: force sending of the request even if interrupted 273 * FR_BACKGROUND: request is sent in the background 274 * FR_WAITING: request is counted as "waiting" 275 * FR_ABORTED: the request was aborted 276 * FR_INTERRUPTED: the request has been interrupted 277 * FR_LOCKED: data is being copied to/from the request 278 * FR_PENDING: request is not yet in userspace 279 * FR_SENT: request is in userspace, waiting for an answer 280 * FR_FINISHED: request is finished 281 * FR_PRIVATE: request is on private list 282 */ 283enum fuse_req_flag { 284 FR_ISREPLY, 285 FR_FORCE, 286 FR_BACKGROUND, 287 FR_WAITING, 288 FR_ABORTED, 289 FR_INTERRUPTED, 290 FR_LOCKED, 291 FR_PENDING, 292 FR_SENT, 293 FR_FINISHED, 294 FR_PRIVATE, 295}; 296 297/** 298 * A request to the client 299 * 300 * .waitq.lock protects the following fields: 301 * - FR_ABORTED 302 * - FR_LOCKED (may also be modified under fc->lock, tested under both) 303 */ 304struct fuse_req { 305 /** This can be on either pending processing or io lists in 306 fuse_conn */ 307 struct list_head list; 308 309 /** Entry on the interrupts list */ 310 struct list_head intr_entry; 311 312 /** refcount */ 313 atomic_t count; 314 315 /** Unique ID for the interrupt request */ 316 u64 intr_unique; 317 318 /* Request flags, updated with test/set/clear_bit() */ 319 unsigned long flags; 320 321 /** The request input */ 322 struct fuse_in in; 323 324 /** The request output */ 325 struct fuse_out out; 326 327 /** Used to wake up the task waiting for completion of request*/ 328 wait_queue_head_t waitq; 329 330 /** Data for asynchronous requests */ 331 union { 332 struct { 333 struct fuse_release_in in; 334 struct inode *inode; 335 } release; 336 struct fuse_init_in init_in; 337 struct fuse_init_out init_out; 338 struct cuse_init_in cuse_init_in; 339 struct { 340 struct fuse_read_in in; 341 u64 attr_ver; 342 } read; 343 struct { 344 struct fuse_write_in in; 345 struct fuse_write_out out; 346 struct fuse_req *next; 347 } write; 348 struct fuse_notify_retrieve_in retrieve_in; 349 } misc; 350 351 /** page vector */ 352 struct page **pages; 353 354 /** page-descriptor vector */ 355 struct fuse_page_desc *page_descs; 356 357 /** size of the 'pages' array */ 358 unsigned max_pages; 359 360 /** inline page vector */ 361 struct page *inline_pages[FUSE_REQ_INLINE_PAGES]; 362 363 /** inline page-descriptor vector */ 364 struct fuse_page_desc inline_page_descs[FUSE_REQ_INLINE_PAGES]; 365 366 /** number of pages in vector */ 367 unsigned num_pages; 368 369 /** File used in the request (or NULL) */ 370 struct fuse_file *ff; 371 372 /** Inode used in the request or NULL */ 373 struct inode *inode; 374 375 /** AIO control block */ 376 struct fuse_io_priv *io; 377 378 /** Link on fi->writepages */ 379 struct list_head writepages_entry; 380 381 /** Request completion callback */ 382 void (*end)(struct fuse_conn *, struct fuse_req *); 383 384 /** Request is stolen from fuse_file->reserved_req */ 385 struct file *stolen_file; 386}; 387 388struct fuse_iqueue { 389 /** Connection established */ 390 unsigned connected; 391 392 /** Readers of the connection are waiting on this */ 393 wait_queue_head_t waitq; 394 395 /** The next unique request id */ 396 u64 reqctr; 397 398 /** The list of pending requests */ 399 struct list_head pending; 400 401 /** Pending interrupts */ 402 struct list_head interrupts; 403 404 /** Queue of pending forgets */ 405 struct fuse_forget_link forget_list_head; 406 struct fuse_forget_link *forget_list_tail; 407 408 /** Batching of FORGET requests (positive indicates FORGET batch) */ 409 int forget_batch; 410 411 /** O_ASYNC requests */ 412 struct fasync_struct *fasync; 413}; 414 415struct fuse_pqueue { 416 /** Connection established */ 417 unsigned connected; 418 419 /** Lock protecting accessess to members of this structure */ 420 spinlock_t lock; 421 422 /** The list of requests being processed */ 423 struct list_head processing; 424 425 /** The list of requests under I/O */ 426 struct list_head io; 427}; 428 429/** 430 * Fuse device instance 431 */ 432struct fuse_dev { 433 /** Fuse connection for this device */ 434 struct fuse_conn *fc; 435 436 /** Processing queue */ 437 struct fuse_pqueue pq; 438 439 /** list entry on fc->devices */ 440 struct list_head entry; 441}; 442 443/** 444 * A Fuse connection. 445 * 446 * This structure is created, when the filesystem is mounted, and is 447 * destroyed, when the client device is closed and the filesystem is 448 * unmounted. 449 */ 450struct fuse_conn { 451 /** Lock protecting accessess to members of this structure */ 452 spinlock_t lock; 453 454 /** Refcount */ 455 atomic_t count; 456 457 /** Number of fuse_dev's */ 458 atomic_t dev_count; 459 460 struct rcu_head rcu; 461 462 /** The user id for this mount */ 463 kuid_t user_id; 464 465 /** The group id for this mount */ 466 kgid_t group_id; 467 468 /** The fuse mount flags for this mount */ 469 unsigned flags; 470 471 /** Maximum read size */ 472 unsigned max_read; 473 474 /** Maximum write size */ 475 unsigned max_write; 476 477 /** Input queue */ 478 struct fuse_iqueue iq; 479 480 /** The next unique kernel file handle */ 481 u64 khctr; 482 483 /** rbtree of fuse_files waiting for poll events indexed by ph */ 484 struct rb_root polled_files; 485 486 /** Maximum number of outstanding background requests */ 487 unsigned max_background; 488 489 /** Number of background requests at which congestion starts */ 490 unsigned congestion_threshold; 491 492 /** Number of requests currently in the background */ 493 unsigned num_background; 494 495 /** Number of background requests currently queued for userspace */ 496 unsigned active_background; 497 498 /** The list of background requests set aside for later queuing */ 499 struct list_head bg_queue; 500 501 /** Flag indicating that INIT reply has been received. Allocating 502 * any fuse request will be suspended until the flag is set */ 503 int initialized; 504 505 /** Flag indicating if connection is blocked. This will be 506 the case before the INIT reply is received, and if there 507 are too many outstading backgrounds requests */ 508 int blocked; 509 510 /** waitq for blocked connection */ 511 wait_queue_head_t blocked_waitq; 512 513 /** waitq for reserved requests */ 514 wait_queue_head_t reserved_req_waitq; 515 516 /** Connection established, cleared on umount, connection 517 abort and device release */ 518 unsigned connected; 519 520 /** Connection failed (version mismatch). Cannot race with 521 setting other bitfields since it is only set once in INIT 522 reply, before any other request, and never cleared */ 523 unsigned conn_error:1; 524 525 /** Connection successful. Only set in INIT */ 526 unsigned conn_init:1; 527 528 /** Do readpages asynchronously? Only set in INIT */ 529 unsigned async_read:1; 530 531 /** Do not send separate SETATTR request before open(O_TRUNC) */ 532 unsigned atomic_o_trunc:1; 533 534 /** Filesystem supports NFS exporting. Only set in INIT */ 535 unsigned export_support:1; 536 537 /** Set if bdi is valid */ 538 unsigned bdi_initialized:1; 539 540 /** write-back cache policy (default is write-through) */ 541 unsigned writeback_cache:1; 542 543 /* 544 * The following bitfields are only for optimization purposes 545 * and hence races in setting them will not cause malfunction 546 */ 547 548 /** Is open/release not implemented by fs? */ 549 unsigned no_open:1; 550 551 /** Is fsync not implemented by fs? */ 552 unsigned no_fsync:1; 553 554 /** Is fsyncdir not implemented by fs? */ 555 unsigned no_fsyncdir:1; 556 557 /** Is flush not implemented by fs? */ 558 unsigned no_flush:1; 559 560 /** Is setxattr not implemented by fs? */ 561 unsigned no_setxattr:1; 562 563 /** Is getxattr not implemented by fs? */ 564 unsigned no_getxattr:1; 565 566 /** Is listxattr not implemented by fs? */ 567 unsigned no_listxattr:1; 568 569 /** Is removexattr not implemented by fs? */ 570 unsigned no_removexattr:1; 571 572 /** Are posix file locking primitives not implemented by fs? */ 573 unsigned no_lock:1; 574 575 /** Is access not implemented by fs? */ 576 unsigned no_access:1; 577 578 /** Is create not implemented by fs? */ 579 unsigned no_create:1; 580 581 /** Is interrupt not implemented by fs? */ 582 unsigned no_interrupt:1; 583 584 /** Is bmap not implemented by fs? */ 585 unsigned no_bmap:1; 586 587 /** Is poll not implemented by fs? */ 588 unsigned no_poll:1; 589 590 /** Do multi-page cached writes */ 591 unsigned big_writes:1; 592 593 /** Don't apply umask to creation modes */ 594 unsigned dont_mask:1; 595 596 /** Are BSD file locking primitives not implemented by fs? */ 597 unsigned no_flock:1; 598 599 /** Is fallocate not implemented by fs? */ 600 unsigned no_fallocate:1; 601 602 /** Is rename with flags implemented by fs? */ 603 unsigned no_rename2:1; 604 605 /** Use enhanced/automatic page cache invalidation. */ 606 unsigned auto_inval_data:1; 607 608 /** Does the filesystem support readdirplus? */ 609 unsigned do_readdirplus:1; 610 611 /** Does the filesystem want adaptive readdirplus? */ 612 unsigned readdirplus_auto:1; 613 614 /** Does the filesystem support asynchronous direct-IO submission? */ 615 unsigned async_dio:1; 616 617 /** The number of requests waiting for completion */ 618 atomic_t num_waiting; 619 620 /** Negotiated minor version */ 621 unsigned minor; 622 623 /** Backing dev info */ 624 struct backing_dev_info bdi; 625 626 /** Entry on the fuse_conn_list */ 627 struct list_head entry; 628 629 /** Device ID from super block */ 630 dev_t dev; 631 632 /** Dentries in the control filesystem */ 633 struct dentry *ctl_dentry[FUSE_CTL_NUM_DENTRIES]; 634 635 /** number of dentries used in the above array */ 636 int ctl_ndents; 637 638 /** Key for lock owner ID scrambling */ 639 u32 scramble_key[4]; 640 641 /** Reserved request for the DESTROY message */ 642 struct fuse_req *destroy_req; 643 644 /** Version counter for attribute changes */ 645 u64 attr_version; 646 647 /** Called on final put */ 648 void (*release)(struct fuse_conn *); 649 650 /** Super block for this connection. */ 651 struct super_block *sb; 652 653 /** Read/write semaphore to hold when accessing sb. */ 654 struct rw_semaphore killsb; 655 656 /** List of device instances belonging to this connection */ 657 struct list_head devices; 658}; 659 660static inline struct fuse_conn *get_fuse_conn_super(struct super_block *sb) 661{ 662 return sb->s_fs_info; 663} 664 665static inline struct fuse_conn *get_fuse_conn(struct inode *inode) 666{ 667 return get_fuse_conn_super(inode->i_sb); 668} 669 670static inline struct fuse_inode *get_fuse_inode(struct inode *inode) 671{ 672 return container_of(inode, struct fuse_inode, inode); 673} 674 675static inline u64 get_node_id(struct inode *inode) 676{ 677 return get_fuse_inode(inode)->nodeid; 678} 679 680/** Device operations */ 681extern const struct file_operations fuse_dev_operations; 682 683extern const struct dentry_operations fuse_dentry_operations; 684 685/** 686 * Inode to nodeid comparison. 687 */ 688int fuse_inode_eq(struct inode *inode, void *_nodeidp); 689 690/** 691 * Get a filled in inode 692 */ 693struct inode *fuse_iget(struct super_block *sb, u64 nodeid, 694 int generation, struct fuse_attr *attr, 695 u64 attr_valid, u64 attr_version); 696 697int fuse_lookup_name(struct super_block *sb, u64 nodeid, struct qstr *name, 698 struct fuse_entry_out *outarg, struct inode **inode); 699 700/** 701 * Send FORGET command 702 */ 703void fuse_queue_forget(struct fuse_conn *fc, struct fuse_forget_link *forget, 704 u64 nodeid, u64 nlookup); 705 706struct fuse_forget_link *fuse_alloc_forget(void); 707 708/* Used by READDIRPLUS */ 709void fuse_force_forget(struct file *file, u64 nodeid); 710 711/** 712 * Initialize READ or READDIR request 713 */ 714void fuse_read_fill(struct fuse_req *req, struct file *file, 715 loff_t pos, size_t count, int opcode); 716 717/** 718 * Send OPEN or OPENDIR request 719 */ 720int fuse_open_common(struct inode *inode, struct file *file, bool isdir); 721 722struct fuse_file *fuse_file_alloc(struct fuse_conn *fc); 723struct fuse_file *fuse_file_get(struct fuse_file *ff); 724void fuse_file_free(struct fuse_file *ff); 725void fuse_finish_open(struct inode *inode, struct file *file); 726 727void fuse_sync_release(struct fuse_file *ff, int flags); 728 729/** 730 * Send RELEASE or RELEASEDIR request 731 */ 732void fuse_release_common(struct file *file, int opcode); 733 734/** 735 * Send FSYNC or FSYNCDIR request 736 */ 737int fuse_fsync_common(struct file *file, loff_t start, loff_t end, 738 int datasync, int isdir); 739 740/** 741 * Notify poll wakeup 742 */ 743int fuse_notify_poll_wakeup(struct fuse_conn *fc, 744 struct fuse_notify_poll_wakeup_out *outarg); 745 746/** 747 * Initialize file operations on a regular file 748 */ 749void fuse_init_file_inode(struct inode *inode); 750 751/** 752 * Initialize inode operations on regular files and special files 753 */ 754void fuse_init_common(struct inode *inode); 755 756/** 757 * Initialize inode and file operations on a directory 758 */ 759void fuse_init_dir(struct inode *inode); 760 761/** 762 * Initialize inode operations on a symlink 763 */ 764void fuse_init_symlink(struct inode *inode); 765 766/** 767 * Change attributes of an inode 768 */ 769void fuse_change_attributes(struct inode *inode, struct fuse_attr *attr, 770 u64 attr_valid, u64 attr_version); 771 772void fuse_change_attributes_common(struct inode *inode, struct fuse_attr *attr, 773 u64 attr_valid); 774 775/** 776 * Initialize the client device 777 */ 778int fuse_dev_init(void); 779 780/** 781 * Cleanup the client device 782 */ 783void fuse_dev_cleanup(void); 784 785int fuse_ctl_init(void); 786void __exit fuse_ctl_cleanup(void); 787 788/** 789 * Allocate a request 790 */ 791struct fuse_req *fuse_request_alloc(unsigned npages); 792 793struct fuse_req *fuse_request_alloc_nofs(unsigned npages); 794 795/** 796 * Free a request 797 */ 798void fuse_request_free(struct fuse_req *req); 799 800/** 801 * Get a request, may fail with -ENOMEM, 802 * caller should specify # elements in req->pages[] explicitly 803 */ 804struct fuse_req *fuse_get_req(struct fuse_conn *fc, unsigned npages); 805struct fuse_req *fuse_get_req_for_background(struct fuse_conn *fc, 806 unsigned npages); 807 808/* 809 * Increment reference count on request 810 */ 811void __fuse_get_request(struct fuse_req *req); 812 813/** 814 * Gets a requests for a file operation, always succeeds 815 */ 816struct fuse_req *fuse_get_req_nofail_nopages(struct fuse_conn *fc, 817 struct file *file); 818 819/** 820 * Decrement reference count of a request. If count goes to zero free 821 * the request. 822 */ 823void fuse_put_request(struct fuse_conn *fc, struct fuse_req *req); 824 825/** 826 * Send a request (synchronous) 827 */ 828void fuse_request_send(struct fuse_conn *fc, struct fuse_req *req); 829 830/** 831 * Simple request sending that does request allocation and freeing 832 */ 833ssize_t fuse_simple_request(struct fuse_conn *fc, struct fuse_args *args); 834 835/** 836 * Send a request in the background 837 */ 838void fuse_request_send_background(struct fuse_conn *fc, struct fuse_req *req); 839 840void fuse_request_send_background_locked(struct fuse_conn *fc, 841 struct fuse_req *req); 842 843/* Abort all requests */ 844void fuse_abort_conn(struct fuse_conn *fc); 845 846/** 847 * Invalidate inode attributes 848 */ 849void fuse_invalidate_attr(struct inode *inode); 850 851void fuse_invalidate_entry_cache(struct dentry *entry); 852 853void fuse_invalidate_atime(struct inode *inode); 854 855/** 856 * Acquire reference to fuse_conn 857 */ 858struct fuse_conn *fuse_conn_get(struct fuse_conn *fc); 859 860/** 861 * Initialize fuse_conn 862 */ 863void fuse_conn_init(struct fuse_conn *fc); 864 865/** 866 * Release reference to fuse_conn 867 */ 868void fuse_conn_put(struct fuse_conn *fc); 869 870struct fuse_dev *fuse_dev_alloc(struct fuse_conn *fc); 871void fuse_dev_free(struct fuse_dev *fud); 872 873/** 874 * Add connection to control filesystem 875 */ 876int fuse_ctl_add_conn(struct fuse_conn *fc); 877 878/** 879 * Remove connection from control filesystem 880 */ 881void fuse_ctl_remove_conn(struct fuse_conn *fc); 882 883/** 884 * Is file type valid? 885 */ 886int fuse_valid_type(int m); 887 888/** 889 * Is current process allowed to perform filesystem operation? 890 */ 891int fuse_allow_current_process(struct fuse_conn *fc); 892 893u64 fuse_lock_owner_id(struct fuse_conn *fc, fl_owner_t id); 894 895int fuse_update_attributes(struct inode *inode, struct kstat *stat, 896 struct file *file, bool *refreshed); 897 898void fuse_flush_writepages(struct inode *inode); 899 900void fuse_set_nowrite(struct inode *inode); 901void fuse_release_nowrite(struct inode *inode); 902 903u64 fuse_get_attr_version(struct fuse_conn *fc); 904 905/** 906 * File-system tells the kernel to invalidate cache for the given node id. 907 */ 908int fuse_reverse_inval_inode(struct super_block *sb, u64 nodeid, 909 loff_t offset, loff_t len); 910 911/** 912 * File-system tells the kernel to invalidate parent attributes and 913 * the dentry matching parent/name. 914 * 915 * If the child_nodeid is non-zero and: 916 * - matches the inode number for the dentry matching parent/name, 917 * - is not a mount point 918 * - is a file or oan empty directory 919 * then the dentry is unhashed (d_delete()). 920 */ 921int fuse_reverse_inval_entry(struct super_block *sb, u64 parent_nodeid, 922 u64 child_nodeid, struct qstr *name); 923 924int fuse_do_open(struct fuse_conn *fc, u64 nodeid, struct file *file, 925 bool isdir); 926 927/** 928 * fuse_direct_io() flags 929 */ 930 931/** If set, it is WRITE; otherwise - READ */ 932#define FUSE_DIO_WRITE (1 << 0) 933 934/** CUSE pass fuse_direct_io() a file which f_mapping->host is not from FUSE */ 935#define FUSE_DIO_CUSE (1 << 1) 936 937ssize_t fuse_direct_io(struct fuse_io_priv *io, struct iov_iter *iter, 938 loff_t *ppos, int flags); 939long fuse_do_ioctl(struct file *file, unsigned int cmd, unsigned long arg, 940 unsigned int flags); 941long fuse_ioctl_common(struct file *file, unsigned int cmd, 942 unsigned long arg, unsigned int flags); 943unsigned fuse_file_poll(struct file *file, poll_table *wait); 944int fuse_dev_release(struct inode *inode, struct file *file); 945 946bool fuse_write_update_size(struct inode *inode, loff_t pos); 947 948int fuse_flush_times(struct inode *inode, struct fuse_file *ff); 949int fuse_write_inode(struct inode *inode, struct writeback_control *wbc); 950 951int fuse_do_setattr(struct inode *inode, struct iattr *attr, 952 struct file *file); 953 954void fuse_set_initialized(struct fuse_conn *fc); 955 956#endif /* _FS_FUSE_I_H */ 957