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