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 }; 267 268 /** 269 * A request to the client 270 */ 271 struct fuse_req { 272 /** This can be on either pending processing or io lists in 273 fuse_conn */ 274 struct list_head list; 275 276 /** Entry on the interrupts list */ 277 struct list_head intr_entry; 278 279 /** refcount */ 280 atomic_t count; 281 282 /** Unique ID for the interrupt request */ 283 u64 intr_unique; 284 285 /* 286 * The following bitfields are either set once before the 287 * request is queued or setting/clearing them is protected by 288 * fuse_conn->lock 289 */ 290 291 /** True if the request has reply */ 292 unsigned isreply:1; 293 294 /** Force sending of the request even if interrupted */ 295 unsigned force:1; 296 297 /** The request was aborted */ 298 unsigned aborted:1; 299 300 /** Request is sent in the background */ 301 unsigned background:1; 302 303 /** The request has been interrupted */ 304 unsigned interrupted:1; 305 306 /** Data is being copied to/from the request */ 307 unsigned locked:1; 308 309 /** Request is counted as "waiting" */ 310 unsigned waiting:1; 311 312 /** State of the request */ 313 enum fuse_req_state state; 314 315 /** The request input */ 316 struct fuse_in in; 317 318 /** The request output */ 319 struct fuse_out out; 320 321 /** Used to wake up the task waiting for completion of request*/ 322 wait_queue_head_t waitq; 323 324 /** Data for asynchronous requests */ 325 union { 326 struct { 327 struct fuse_release_in in; 328 struct inode *inode; 329 } release; 330 struct fuse_init_in init_in; 331 struct fuse_init_out init_out; 332 struct cuse_init_in cuse_init_in; 333 struct { 334 struct fuse_read_in in; 335 u64 attr_ver; 336 } read; 337 struct { 338 struct fuse_write_in in; 339 struct fuse_write_out out; 340 struct fuse_req *next; 341 } write; 342 struct fuse_notify_retrieve_in retrieve_in; 343 } misc; 344 345 /** page vector */ 346 struct page **pages; 347 348 /** page-descriptor vector */ 349 struct fuse_page_desc *page_descs; 350 351 /** size of the 'pages' array */ 352 unsigned max_pages; 353 354 /** inline page vector */ 355 struct page *inline_pages[FUSE_REQ_INLINE_PAGES]; 356 357 /** inline page-descriptor vector */ 358 struct fuse_page_desc inline_page_descs[FUSE_REQ_INLINE_PAGES]; 359 360 /** number of pages in vector */ 361 unsigned num_pages; 362 363 /** File used in the request (or NULL) */ 364 struct fuse_file *ff; 365 366 /** Inode used in the request or NULL */ 367 struct inode *inode; 368 369 /** AIO control block */ 370 struct fuse_io_priv *io; 371 372 /** Link on fi->writepages */ 373 struct list_head writepages_entry; 374 375 /** Request completion callback */ 376 void (*end)(struct fuse_conn *, struct fuse_req *); 377 378 /** Request is stolen from fuse_file->reserved_req */ 379 struct file *stolen_file; 380 }; 381 382 /** 383 * A Fuse connection. 384 * 385 * This structure is created, when the filesystem is mounted, and is 386 * destroyed, when the client device is closed and the filesystem is 387 * unmounted. 388 */ 389 struct fuse_conn { 390 /** Lock protecting accessess to members of this structure */ 391 spinlock_t lock; 392 393 /** Refcount */ 394 atomic_t count; 395 396 struct rcu_head rcu; 397 398 /** The user id for this mount */ 399 kuid_t user_id; 400 401 /** The group id for this mount */ 402 kgid_t group_id; 403 404 /** The fuse mount flags for this mount */ 405 unsigned flags; 406 407 /** Maximum read size */ 408 unsigned max_read; 409 410 /** Maximum write size */ 411 unsigned max_write; 412 413 /** Readers of the connection are waiting on this */ 414 wait_queue_head_t waitq; 415 416 /** The list of pending requests */ 417 struct list_head pending; 418 419 /** The list of requests being processed */ 420 struct list_head processing; 421 422 /** The list of requests under I/O */ 423 struct list_head io; 424 425 /** The next unique kernel file handle */ 426 u64 khctr; 427 428 /** rbtree of fuse_files waiting for poll events indexed by ph */ 429 struct rb_root polled_files; 430 431 /** Maximum number of outstanding background requests */ 432 unsigned max_background; 433 434 /** Number of background requests at which congestion starts */ 435 unsigned congestion_threshold; 436 437 /** Number of requests currently in the background */ 438 unsigned num_background; 439 440 /** Number of background requests currently queued for userspace */ 441 unsigned active_background; 442 443 /** The list of background requests set aside for later queuing */ 444 struct list_head bg_queue; 445 446 /** Pending interrupts */ 447 struct list_head interrupts; 448 449 /** Queue of pending forgets */ 450 struct fuse_forget_link forget_list_head; 451 struct fuse_forget_link *forget_list_tail; 452 453 /** Batching of FORGET requests (positive indicates FORGET batch) */ 454 int forget_batch; 455 456 /** Flag indicating that INIT reply has been received. Allocating 457 * any fuse request will be suspended until the flag is set */ 458 int initialized; 459 460 /** Flag indicating if connection is blocked. This will be 461 the case before the INIT reply is received, and if there 462 are too many outstading backgrounds requests */ 463 int blocked; 464 465 /** waitq for blocked connection */ 466 wait_queue_head_t blocked_waitq; 467 468 /** waitq for reserved requests */ 469 wait_queue_head_t reserved_req_waitq; 470 471 /** The next unique request id */ 472 u64 reqctr; 473 474 /** Connection established, cleared on umount, connection 475 abort and device release */ 476 unsigned connected; 477 478 /** Connection failed (version mismatch). Cannot race with 479 setting other bitfields since it is only set once in INIT 480 reply, before any other request, and never cleared */ 481 unsigned conn_error:1; 482 483 /** Connection successful. Only set in INIT */ 484 unsigned conn_init:1; 485 486 /** Do readpages asynchronously? Only set in INIT */ 487 unsigned async_read:1; 488 489 /** Do not send separate SETATTR request before open(O_TRUNC) */ 490 unsigned atomic_o_trunc:1; 491 492 /** Filesystem supports NFS exporting. Only set in INIT */ 493 unsigned export_support:1; 494 495 /** Set if bdi is valid */ 496 unsigned bdi_initialized:1; 497 498 /** write-back cache policy (default is write-through) */ 499 unsigned writeback_cache:1; 500 501 /* 502 * The following bitfields are only for optimization purposes 503 * and hence races in setting them will not cause malfunction 504 */ 505 506 /** Is open/release not implemented by fs? */ 507 unsigned no_open:1; 508 509 /** Is fsync not implemented by fs? */ 510 unsigned no_fsync:1; 511 512 /** Is fsyncdir not implemented by fs? */ 513 unsigned no_fsyncdir:1; 514 515 /** Is flush not implemented by fs? */ 516 unsigned no_flush:1; 517 518 /** Is setxattr not implemented by fs? */ 519 unsigned no_setxattr:1; 520 521 /** Is getxattr not implemented by fs? */ 522 unsigned no_getxattr:1; 523 524 /** Is listxattr not implemented by fs? */ 525 unsigned no_listxattr:1; 526 527 /** Is removexattr not implemented by fs? */ 528 unsigned no_removexattr:1; 529 530 /** Are posix file locking primitives not implemented by fs? */ 531 unsigned no_lock:1; 532 533 /** Is access not implemented by fs? */ 534 unsigned no_access:1; 535 536 /** Is create not implemented by fs? */ 537 unsigned no_create:1; 538 539 /** Is interrupt not implemented by fs? */ 540 unsigned no_interrupt:1; 541 542 /** Is bmap not implemented by fs? */ 543 unsigned no_bmap:1; 544 545 /** Is poll not implemented by fs? */ 546 unsigned no_poll:1; 547 548 /** Do multi-page cached writes */ 549 unsigned big_writes:1; 550 551 /** Don't apply umask to creation modes */ 552 unsigned dont_mask:1; 553 554 /** Are BSD file locking primitives not implemented by fs? */ 555 unsigned no_flock:1; 556 557 /** Is fallocate not implemented by fs? */ 558 unsigned no_fallocate:1; 559 560 /** Is rename with flags implemented by fs? */ 561 unsigned no_rename2:1; 562 563 /** Use enhanced/automatic page cache invalidation. */ 564 unsigned auto_inval_data:1; 565 566 /** Does the filesystem support readdirplus? */ 567 unsigned do_readdirplus:1; 568 569 /** Does the filesystem want adaptive readdirplus? */ 570 unsigned readdirplus_auto:1; 571 572 /** Does the filesystem support asynchronous direct-IO submission? */ 573 unsigned async_dio:1; 574 575 /** The number of requests waiting for completion */ 576 atomic_t num_waiting; 577 578 /** Negotiated minor version */ 579 unsigned minor; 580 581 /** Backing dev info */ 582 struct backing_dev_info bdi; 583 584 /** Entry on the fuse_conn_list */ 585 struct list_head entry; 586 587 /** Device ID from super block */ 588 dev_t dev; 589 590 /** Dentries in the control filesystem */ 591 struct dentry *ctl_dentry[FUSE_CTL_NUM_DENTRIES]; 592 593 /** number of dentries used in the above array */ 594 int ctl_ndents; 595 596 /** O_ASYNC requests */ 597 struct fasync_struct *fasync; 598 599 /** Key for lock owner ID scrambling */ 600 u32 scramble_key[4]; 601 602 /** Reserved request for the DESTROY message */ 603 struct fuse_req *destroy_req; 604 605 /** Version counter for attribute changes */ 606 u64 attr_version; 607 608 /** Called on final put */ 609 void (*release)(struct fuse_conn *); 610 611 /** Super block for this connection. */ 612 struct super_block *sb; 613 614 /** Read/write semaphore to hold when accessing sb. */ 615 struct rw_semaphore killsb; 616 }; 617 618 static inline struct fuse_conn *get_fuse_conn_super(struct super_block *sb) 619 { 620 return sb->s_fs_info; 621 } 622 623 static inline struct fuse_conn *get_fuse_conn(struct inode *inode) 624 { 625 return get_fuse_conn_super(inode->i_sb); 626 } 627 628 static inline struct fuse_inode *get_fuse_inode(struct inode *inode) 629 { 630 return container_of(inode, struct fuse_inode, inode); 631 } 632 633 static inline u64 get_node_id(struct inode *inode) 634 { 635 return get_fuse_inode(inode)->nodeid; 636 } 637 638 /** Device operations */ 639 extern const struct file_operations fuse_dev_operations; 640 641 extern const struct dentry_operations fuse_dentry_operations; 642 643 /** 644 * Inode to nodeid comparison. 645 */ 646 int fuse_inode_eq(struct inode *inode, void *_nodeidp); 647 648 /** 649 * Get a filled in inode 650 */ 651 struct inode *fuse_iget(struct super_block *sb, u64 nodeid, 652 int generation, struct fuse_attr *attr, 653 u64 attr_valid, u64 attr_version); 654 655 int fuse_lookup_name(struct super_block *sb, u64 nodeid, struct qstr *name, 656 struct fuse_entry_out *outarg, struct inode **inode); 657 658 /** 659 * Send FORGET command 660 */ 661 void fuse_queue_forget(struct fuse_conn *fc, struct fuse_forget_link *forget, 662 u64 nodeid, u64 nlookup); 663 664 struct fuse_forget_link *fuse_alloc_forget(void); 665 666 /* Used by READDIRPLUS */ 667 void fuse_force_forget(struct file *file, u64 nodeid); 668 669 /** 670 * Initialize READ or READDIR request 671 */ 672 void fuse_read_fill(struct fuse_req *req, struct file *file, 673 loff_t pos, size_t count, int opcode); 674 675 /** 676 * Send OPEN or OPENDIR request 677 */ 678 int fuse_open_common(struct inode *inode, struct file *file, bool isdir); 679 680 struct fuse_file *fuse_file_alloc(struct fuse_conn *fc); 681 struct fuse_file *fuse_file_get(struct fuse_file *ff); 682 void fuse_file_free(struct fuse_file *ff); 683 void fuse_finish_open(struct inode *inode, struct file *file); 684 685 void fuse_sync_release(struct fuse_file *ff, int flags); 686 687 /** 688 * Send RELEASE or RELEASEDIR request 689 */ 690 void fuse_release_common(struct file *file, int opcode); 691 692 /** 693 * Send FSYNC or FSYNCDIR request 694 */ 695 int fuse_fsync_common(struct file *file, loff_t start, loff_t end, 696 int datasync, int isdir); 697 698 /** 699 * Notify poll wakeup 700 */ 701 int fuse_notify_poll_wakeup(struct fuse_conn *fc, 702 struct fuse_notify_poll_wakeup_out *outarg); 703 704 /** 705 * Initialize file operations on a regular file 706 */ 707 void fuse_init_file_inode(struct inode *inode); 708 709 /** 710 * Initialize inode operations on regular files and special files 711 */ 712 void fuse_init_common(struct inode *inode); 713 714 /** 715 * Initialize inode and file operations on a directory 716 */ 717 void fuse_init_dir(struct inode *inode); 718 719 /** 720 * Initialize inode operations on a symlink 721 */ 722 void fuse_init_symlink(struct inode *inode); 723 724 /** 725 * Change attributes of an inode 726 */ 727 void fuse_change_attributes(struct inode *inode, struct fuse_attr *attr, 728 u64 attr_valid, u64 attr_version); 729 730 void fuse_change_attributes_common(struct inode *inode, struct fuse_attr *attr, 731 u64 attr_valid); 732 733 /** 734 * Initialize the client device 735 */ 736 int fuse_dev_init(void); 737 738 /** 739 * Cleanup the client device 740 */ 741 void fuse_dev_cleanup(void); 742 743 int fuse_ctl_init(void); 744 void __exit fuse_ctl_cleanup(void); 745 746 /** 747 * Allocate a request 748 */ 749 struct fuse_req *fuse_request_alloc(unsigned npages); 750 751 struct fuse_req *fuse_request_alloc_nofs(unsigned npages); 752 753 /** 754 * Free a request 755 */ 756 void fuse_request_free(struct fuse_req *req); 757 758 /** 759 * Get a request, may fail with -ENOMEM, 760 * caller should specify # elements in req->pages[] explicitly 761 */ 762 struct fuse_req *fuse_get_req(struct fuse_conn *fc, unsigned npages); 763 struct fuse_req *fuse_get_req_for_background(struct fuse_conn *fc, 764 unsigned npages); 765 766 /* 767 * Increment reference count on request 768 */ 769 void __fuse_get_request(struct fuse_req *req); 770 771 /** 772 * Gets a requests for a file operation, always succeeds 773 */ 774 struct fuse_req *fuse_get_req_nofail_nopages(struct fuse_conn *fc, 775 struct file *file); 776 777 /** 778 * Decrement reference count of a request. If count goes to zero free 779 * the request. 780 */ 781 void fuse_put_request(struct fuse_conn *fc, struct fuse_req *req); 782 783 /** 784 * Send a request (synchronous) 785 */ 786 void fuse_request_send(struct fuse_conn *fc, struct fuse_req *req); 787 788 /** 789 * Simple request sending that does request allocation and freeing 790 */ 791 ssize_t fuse_simple_request(struct fuse_conn *fc, struct fuse_args *args); 792 793 /** 794 * Send a request in the background 795 */ 796 void fuse_request_send_background(struct fuse_conn *fc, struct fuse_req *req); 797 798 void fuse_request_send_background_locked(struct fuse_conn *fc, 799 struct fuse_req *req); 800 801 /* Abort all requests */ 802 void fuse_abort_conn(struct fuse_conn *fc); 803 804 /** 805 * Invalidate inode attributes 806 */ 807 void fuse_invalidate_attr(struct inode *inode); 808 809 void fuse_invalidate_entry_cache(struct dentry *entry); 810 811 void fuse_invalidate_atime(struct inode *inode); 812 813 /** 814 * Acquire reference to fuse_conn 815 */ 816 struct fuse_conn *fuse_conn_get(struct fuse_conn *fc); 817 818 /** 819 * Initialize fuse_conn 820 */ 821 void fuse_conn_init(struct fuse_conn *fc); 822 823 /** 824 * Release reference to fuse_conn 825 */ 826 void fuse_conn_put(struct fuse_conn *fc); 827 828 /** 829 * Add connection to control filesystem 830 */ 831 int fuse_ctl_add_conn(struct fuse_conn *fc); 832 833 /** 834 * Remove connection from control filesystem 835 */ 836 void fuse_ctl_remove_conn(struct fuse_conn *fc); 837 838 /** 839 * Is file type valid? 840 */ 841 int fuse_valid_type(int m); 842 843 /** 844 * Is current process allowed to perform filesystem operation? 845 */ 846 int fuse_allow_current_process(struct fuse_conn *fc); 847 848 u64 fuse_lock_owner_id(struct fuse_conn *fc, fl_owner_t id); 849 850 int fuse_update_attributes(struct inode *inode, struct kstat *stat, 851 struct file *file, bool *refreshed); 852 853 void fuse_flush_writepages(struct inode *inode); 854 855 void fuse_set_nowrite(struct inode *inode); 856 void fuse_release_nowrite(struct inode *inode); 857 858 u64 fuse_get_attr_version(struct fuse_conn *fc); 859 860 /** 861 * File-system tells the kernel to invalidate cache for the given node id. 862 */ 863 int fuse_reverse_inval_inode(struct super_block *sb, u64 nodeid, 864 loff_t offset, loff_t len); 865 866 /** 867 * File-system tells the kernel to invalidate parent attributes and 868 * the dentry matching parent/name. 869 * 870 * If the child_nodeid is non-zero and: 871 * - matches the inode number for the dentry matching parent/name, 872 * - is not a mount point 873 * - is a file or oan empty directory 874 * then the dentry is unhashed (d_delete()). 875 */ 876 int fuse_reverse_inval_entry(struct super_block *sb, u64 parent_nodeid, 877 u64 child_nodeid, struct qstr *name); 878 879 int fuse_do_open(struct fuse_conn *fc, u64 nodeid, struct file *file, 880 bool isdir); 881 882 /** 883 * fuse_direct_io() flags 884 */ 885 886 /** If set, it is WRITE; otherwise - READ */ 887 #define FUSE_DIO_WRITE (1 << 0) 888 889 /** CUSE pass fuse_direct_io() a file which f_mapping->host is not from FUSE */ 890 #define FUSE_DIO_CUSE (1 << 1) 891 892 ssize_t fuse_direct_io(struct fuse_io_priv *io, struct iov_iter *iter, 893 loff_t *ppos, int flags); 894 long fuse_do_ioctl(struct file *file, unsigned int cmd, unsigned long arg, 895 unsigned int flags); 896 long fuse_ioctl_common(struct file *file, unsigned int cmd, 897 unsigned long arg, unsigned int flags); 898 unsigned fuse_file_poll(struct file *file, poll_table *wait); 899 int fuse_dev_release(struct inode *inode, struct file *file); 900 901 bool fuse_write_update_size(struct inode *inode, loff_t pos); 902 903 int fuse_flush_times(struct inode *inode, struct fuse_file *ff); 904 int fuse_write_inode(struct inode *inode, struct writeback_control *wbc); 905 906 int fuse_do_setattr(struct inode *inode, struct iattr *attr, 907 struct file *file); 908 909 #endif /* _FS_FUSE_I_H */ 910