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[3]; 217 }; 218 219 /** FUSE page descriptor */ 220 struct fuse_page_desc { 221 unsigned int length; 222 unsigned int offset; 223 }; 224 225 /** The request state */ 226 enum fuse_req_state { 227 FUSE_REQ_INIT = 0, 228 FUSE_REQ_PENDING, 229 FUSE_REQ_READING, 230 FUSE_REQ_SENT, 231 FUSE_REQ_WRITING, 232 FUSE_REQ_FINISHED 233 }; 234 235 /** The request IO state (for asynchronous processing) */ 236 struct fuse_io_priv { 237 int async; 238 spinlock_t lock; 239 unsigned reqs; 240 ssize_t bytes; 241 size_t size; 242 __u64 offset; 243 bool write; 244 int err; 245 struct kiocb *iocb; 246 struct file *file; 247 }; 248 249 /** 250 * A request to the client 251 */ 252 struct fuse_req { 253 /** This can be on either pending processing or io lists in 254 fuse_conn */ 255 struct list_head list; 256 257 /** Entry on the interrupts list */ 258 struct list_head intr_entry; 259 260 /** refcount */ 261 atomic_t count; 262 263 /** Unique ID for the interrupt request */ 264 u64 intr_unique; 265 266 /* 267 * The following bitfields are either set once before the 268 * request is queued or setting/clearing them is protected by 269 * fuse_conn->lock 270 */ 271 272 /** True if the request has reply */ 273 unsigned isreply:1; 274 275 /** Force sending of the request even if interrupted */ 276 unsigned force:1; 277 278 /** The request was aborted */ 279 unsigned aborted:1; 280 281 /** Request is sent in the background */ 282 unsigned background:1; 283 284 /** The request has been interrupted */ 285 unsigned interrupted:1; 286 287 /** Data is being copied to/from the request */ 288 unsigned locked:1; 289 290 /** Request is counted as "waiting" */ 291 unsigned waiting:1; 292 293 /** State of the request */ 294 enum fuse_req_state state; 295 296 /** The request input */ 297 struct fuse_in in; 298 299 /** The request output */ 300 struct fuse_out out; 301 302 /** Used to wake up the task waiting for completion of request*/ 303 wait_queue_head_t waitq; 304 305 /** Data for asynchronous requests */ 306 union { 307 struct { 308 union { 309 struct fuse_release_in in; 310 struct work_struct work; 311 }; 312 struct path path; 313 } release; 314 struct fuse_init_in init_in; 315 struct fuse_init_out init_out; 316 struct cuse_init_in cuse_init_in; 317 struct { 318 struct fuse_read_in in; 319 u64 attr_ver; 320 } read; 321 struct { 322 struct fuse_write_in in; 323 struct fuse_write_out out; 324 struct fuse_req *next; 325 } write; 326 struct fuse_notify_retrieve_in retrieve_in; 327 struct fuse_lk_in lk_in; 328 } misc; 329 330 /** page vector */ 331 struct page **pages; 332 333 /** page-descriptor vector */ 334 struct fuse_page_desc *page_descs; 335 336 /** size of the 'pages' array */ 337 unsigned max_pages; 338 339 /** inline page vector */ 340 struct page *inline_pages[FUSE_REQ_INLINE_PAGES]; 341 342 /** inline page-descriptor vector */ 343 struct fuse_page_desc inline_page_descs[FUSE_REQ_INLINE_PAGES]; 344 345 /** number of pages in vector */ 346 unsigned num_pages; 347 348 /** File used in the request (or NULL) */ 349 struct fuse_file *ff; 350 351 /** Inode used in the request or NULL */ 352 struct inode *inode; 353 354 /** AIO control block */ 355 struct fuse_io_priv *io; 356 357 /** Link on fi->writepages */ 358 struct list_head writepages_entry; 359 360 /** Request completion callback */ 361 void (*end)(struct fuse_conn *, struct fuse_req *); 362 363 /** Request is stolen from fuse_file->reserved_req */ 364 struct file *stolen_file; 365 }; 366 367 /** 368 * A Fuse connection. 369 * 370 * This structure is created, when the filesystem is mounted, and is 371 * destroyed, when the client device is closed and the filesystem is 372 * unmounted. 373 */ 374 struct fuse_conn { 375 /** Lock protecting accessess to members of this structure */ 376 spinlock_t lock; 377 378 /** Refcount */ 379 atomic_t count; 380 381 struct rcu_head rcu; 382 383 /** The user id for this mount */ 384 kuid_t user_id; 385 386 /** The group id for this mount */ 387 kgid_t group_id; 388 389 /** The fuse mount flags for this mount */ 390 unsigned flags; 391 392 /** Maximum read size */ 393 unsigned max_read; 394 395 /** Maximum write size */ 396 unsigned max_write; 397 398 /** Readers of the connection are waiting on this */ 399 wait_queue_head_t waitq; 400 401 /** The list of pending requests */ 402 struct list_head pending; 403 404 /** The list of requests being processed */ 405 struct list_head processing; 406 407 /** The list of requests under I/O */ 408 struct list_head io; 409 410 /** The next unique kernel file handle */ 411 u64 khctr; 412 413 /** rbtree of fuse_files waiting for poll events indexed by ph */ 414 struct rb_root polled_files; 415 416 /** Maximum number of outstanding background requests */ 417 unsigned max_background; 418 419 /** Number of background requests at which congestion starts */ 420 unsigned congestion_threshold; 421 422 /** Number of requests currently in the background */ 423 unsigned num_background; 424 425 /** Number of background requests currently queued for userspace */ 426 unsigned active_background; 427 428 /** The list of background requests set aside for later queuing */ 429 struct list_head bg_queue; 430 431 /** Pending interrupts */ 432 struct list_head interrupts; 433 434 /** Queue of pending forgets */ 435 struct fuse_forget_link forget_list_head; 436 struct fuse_forget_link *forget_list_tail; 437 438 /** Batching of FORGET requests (positive indicates FORGET batch) */ 439 int forget_batch; 440 441 /** Flag indicating that INIT reply has been received. Allocating 442 * any fuse request will be suspended until the flag is set */ 443 int initialized; 444 445 /** Flag indicating if connection is blocked. This will be 446 the case before the INIT reply is received, and if there 447 are too many outstading backgrounds requests */ 448 int blocked; 449 450 /** waitq for blocked connection */ 451 wait_queue_head_t blocked_waitq; 452 453 /** waitq for reserved requests */ 454 wait_queue_head_t reserved_req_waitq; 455 456 /** The next unique request id */ 457 u64 reqctr; 458 459 /** Connection established, cleared on umount, connection 460 abort and device release */ 461 unsigned connected; 462 463 /** Connection failed (version mismatch). Cannot race with 464 setting other bitfields since it is only set once in INIT 465 reply, before any other request, and never cleared */ 466 unsigned conn_error:1; 467 468 /** Connection successful. Only set in INIT */ 469 unsigned conn_init:1; 470 471 /** Do readpages asynchronously? Only set in INIT */ 472 unsigned async_read:1; 473 474 /** Do not send separate SETATTR request before open(O_TRUNC) */ 475 unsigned atomic_o_trunc:1; 476 477 /** Filesystem supports NFS exporting. Only set in INIT */ 478 unsigned export_support:1; 479 480 /** Set if bdi is valid */ 481 unsigned bdi_initialized:1; 482 483 /* 484 * The following bitfields are only for optimization purposes 485 * and hence races in setting them will not cause malfunction 486 */ 487 488 /** Is open/release not implemented by fs? */ 489 unsigned no_open:1; 490 491 /** Is fsync not implemented by fs? */ 492 unsigned no_fsync:1; 493 494 /** Is fsyncdir not implemented by fs? */ 495 unsigned no_fsyncdir:1; 496 497 /** Is flush not implemented by fs? */ 498 unsigned no_flush:1; 499 500 /** Is setxattr not implemented by fs? */ 501 unsigned no_setxattr:1; 502 503 /** Is getxattr not implemented by fs? */ 504 unsigned no_getxattr:1; 505 506 /** Is listxattr not implemented by fs? */ 507 unsigned no_listxattr:1; 508 509 /** Is removexattr not implemented by fs? */ 510 unsigned no_removexattr:1; 511 512 /** Are posix file locking primitives not implemented by fs? */ 513 unsigned no_lock:1; 514 515 /** Is access not implemented by fs? */ 516 unsigned no_access:1; 517 518 /** Is create not implemented by fs? */ 519 unsigned no_create:1; 520 521 /** Is interrupt not implemented by fs? */ 522 unsigned no_interrupt:1; 523 524 /** Is bmap not implemented by fs? */ 525 unsigned no_bmap:1; 526 527 /** Is poll not implemented by fs? */ 528 unsigned no_poll:1; 529 530 /** Do multi-page cached writes */ 531 unsigned big_writes:1; 532 533 /** Don't apply umask to creation modes */ 534 unsigned dont_mask:1; 535 536 /** Are BSD file locking primitives not implemented by fs? */ 537 unsigned no_flock:1; 538 539 /** Is fallocate not implemented by fs? */ 540 unsigned no_fallocate:1; 541 542 /** Use enhanced/automatic page cache invalidation. */ 543 unsigned auto_inval_data:1; 544 545 /** Does the filesystem support readdirplus? */ 546 unsigned do_readdirplus:1; 547 548 /** Does the filesystem want adaptive readdirplus? */ 549 unsigned readdirplus_auto:1; 550 551 /** Does the filesystem support asynchronous direct-IO submission? */ 552 unsigned async_dio:1; 553 554 /** The number of requests waiting for completion */ 555 atomic_t num_waiting; 556 557 /** Negotiated minor version */ 558 unsigned minor; 559 560 /** Backing dev info */ 561 struct backing_dev_info bdi; 562 563 /** Entry on the fuse_conn_list */ 564 struct list_head entry; 565 566 /** Device ID from super block */ 567 dev_t dev; 568 569 /** Dentries in the control filesystem */ 570 struct dentry *ctl_dentry[FUSE_CTL_NUM_DENTRIES]; 571 572 /** number of dentries used in the above array */ 573 int ctl_ndents; 574 575 /** O_ASYNC requests */ 576 struct fasync_struct *fasync; 577 578 /** Key for lock owner ID scrambling */ 579 u32 scramble_key[4]; 580 581 /** Reserved request for the DESTROY message */ 582 struct fuse_req *destroy_req; 583 584 /** Version counter for attribute changes */ 585 u64 attr_version; 586 587 /** Called on final put */ 588 void (*release)(struct fuse_conn *); 589 590 /** Super block for this connection. */ 591 struct super_block *sb; 592 593 /** Read/write semaphore to hold when accessing sb. */ 594 struct rw_semaphore killsb; 595 }; 596 597 static inline struct fuse_conn *get_fuse_conn_super(struct super_block *sb) 598 { 599 return sb->s_fs_info; 600 } 601 602 static inline struct fuse_conn *get_fuse_conn(struct inode *inode) 603 { 604 return get_fuse_conn_super(inode->i_sb); 605 } 606 607 static inline struct fuse_inode *get_fuse_inode(struct inode *inode) 608 { 609 return container_of(inode, struct fuse_inode, inode); 610 } 611 612 static inline u64 get_node_id(struct inode *inode) 613 { 614 return get_fuse_inode(inode)->nodeid; 615 } 616 617 /** Device operations */ 618 extern const struct file_operations fuse_dev_operations; 619 620 extern const struct dentry_operations fuse_dentry_operations; 621 622 /** 623 * Inode to nodeid comparison. 624 */ 625 int fuse_inode_eq(struct inode *inode, void *_nodeidp); 626 627 /** 628 * Get a filled in inode 629 */ 630 struct inode *fuse_iget(struct super_block *sb, u64 nodeid, 631 int generation, struct fuse_attr *attr, 632 u64 attr_valid, u64 attr_version); 633 634 int fuse_lookup_name(struct super_block *sb, u64 nodeid, struct qstr *name, 635 struct fuse_entry_out *outarg, struct inode **inode); 636 637 /** 638 * Send FORGET command 639 */ 640 void fuse_queue_forget(struct fuse_conn *fc, struct fuse_forget_link *forget, 641 u64 nodeid, u64 nlookup); 642 643 struct fuse_forget_link *fuse_alloc_forget(void); 644 645 /* Used by READDIRPLUS */ 646 void fuse_force_forget(struct file *file, u64 nodeid); 647 648 /** 649 * Initialize READ or READDIR request 650 */ 651 void fuse_read_fill(struct fuse_req *req, struct file *file, 652 loff_t pos, size_t count, int opcode); 653 654 /** 655 * Send OPEN or OPENDIR request 656 */ 657 int fuse_open_common(struct inode *inode, struct file *file, bool isdir); 658 659 struct fuse_file *fuse_file_alloc(struct fuse_conn *fc); 660 struct fuse_file *fuse_file_get(struct fuse_file *ff); 661 void fuse_file_free(struct fuse_file *ff); 662 void fuse_finish_open(struct inode *inode, struct file *file); 663 664 void fuse_sync_release(struct fuse_file *ff, int flags); 665 666 /** 667 * Send RELEASE or RELEASEDIR request 668 */ 669 void fuse_release_common(struct file *file, int opcode); 670 671 /** 672 * Send FSYNC or FSYNCDIR request 673 */ 674 int fuse_fsync_common(struct file *file, loff_t start, loff_t end, 675 int datasync, int isdir); 676 677 /** 678 * Notify poll wakeup 679 */ 680 int fuse_notify_poll_wakeup(struct fuse_conn *fc, 681 struct fuse_notify_poll_wakeup_out *outarg); 682 683 /** 684 * Initialize file operations on a regular file 685 */ 686 void fuse_init_file_inode(struct inode *inode); 687 688 /** 689 * Initialize inode operations on regular files and special files 690 */ 691 void fuse_init_common(struct inode *inode); 692 693 /** 694 * Initialize inode and file operations on a directory 695 */ 696 void fuse_init_dir(struct inode *inode); 697 698 /** 699 * Initialize inode operations on a symlink 700 */ 701 void fuse_init_symlink(struct inode *inode); 702 703 /** 704 * Change attributes of an inode 705 */ 706 void fuse_change_attributes(struct inode *inode, struct fuse_attr *attr, 707 u64 attr_valid, u64 attr_version); 708 709 void fuse_change_attributes_common(struct inode *inode, struct fuse_attr *attr, 710 u64 attr_valid); 711 712 /** 713 * Initialize the client device 714 */ 715 int fuse_dev_init(void); 716 717 /** 718 * Cleanup the client device 719 */ 720 void fuse_dev_cleanup(void); 721 722 int fuse_ctl_init(void); 723 void fuse_ctl_cleanup(void); 724 725 /** 726 * Allocate a request 727 */ 728 struct fuse_req *fuse_request_alloc(unsigned npages); 729 730 struct fuse_req *fuse_request_alloc_nofs(unsigned npages); 731 732 /** 733 * Free a request 734 */ 735 void fuse_request_free(struct fuse_req *req); 736 737 /** 738 * Get a request, may fail with -ENOMEM, 739 * caller should specify # elements in req->pages[] explicitly 740 */ 741 struct fuse_req *fuse_get_req(struct fuse_conn *fc, unsigned npages); 742 struct fuse_req *fuse_get_req_for_background(struct fuse_conn *fc, 743 unsigned npages); 744 745 /* 746 * Increment reference count on request 747 */ 748 void __fuse_get_request(struct fuse_req *req); 749 750 /** 751 * Get a request, may fail with -ENOMEM, 752 * useful for callers who doesn't use req->pages[] 753 */ 754 static inline struct fuse_req *fuse_get_req_nopages(struct fuse_conn *fc) 755 { 756 return fuse_get_req(fc, 0); 757 } 758 759 /** 760 * Gets a requests for a file operation, always succeeds 761 */ 762 struct fuse_req *fuse_get_req_nofail_nopages(struct fuse_conn *fc, 763 struct file *file); 764 765 /** 766 * Decrement reference count of a request. If count goes to zero free 767 * the request. 768 */ 769 void fuse_put_request(struct fuse_conn *fc, struct fuse_req *req); 770 771 /** 772 * Send a request (synchronous) 773 */ 774 void fuse_request_send(struct fuse_conn *fc, struct fuse_req *req); 775 776 /** 777 * Send a request in the background 778 */ 779 void fuse_request_send_background(struct fuse_conn *fc, struct fuse_req *req); 780 781 void fuse_request_send_background_locked(struct fuse_conn *fc, 782 struct fuse_req *req); 783 784 /* Abort all requests */ 785 void fuse_abort_conn(struct fuse_conn *fc); 786 787 /** 788 * Invalidate inode attributes 789 */ 790 void fuse_invalidate_attr(struct inode *inode); 791 792 void fuse_invalidate_entry_cache(struct dentry *entry); 793 794 void fuse_invalidate_atime(struct inode *inode); 795 796 /** 797 * Acquire reference to fuse_conn 798 */ 799 struct fuse_conn *fuse_conn_get(struct fuse_conn *fc); 800 801 void fuse_conn_kill(struct fuse_conn *fc); 802 803 /** 804 * Initialize fuse_conn 805 */ 806 void fuse_conn_init(struct fuse_conn *fc); 807 808 /** 809 * Release reference to fuse_conn 810 */ 811 void fuse_conn_put(struct fuse_conn *fc); 812 813 /** 814 * Add connection to control filesystem 815 */ 816 int fuse_ctl_add_conn(struct fuse_conn *fc); 817 818 /** 819 * Remove connection from control filesystem 820 */ 821 void fuse_ctl_remove_conn(struct fuse_conn *fc); 822 823 /** 824 * Is file type valid? 825 */ 826 int fuse_valid_type(int m); 827 828 /** 829 * Is current process allowed to perform filesystem operation? 830 */ 831 int fuse_allow_current_process(struct fuse_conn *fc); 832 833 u64 fuse_lock_owner_id(struct fuse_conn *fc, fl_owner_t id); 834 835 int fuse_update_attributes(struct inode *inode, struct kstat *stat, 836 struct file *file, bool *refreshed); 837 838 void fuse_flush_writepages(struct inode *inode); 839 840 void fuse_set_nowrite(struct inode *inode); 841 void fuse_release_nowrite(struct inode *inode); 842 843 u64 fuse_get_attr_version(struct fuse_conn *fc); 844 845 /** 846 * File-system tells the kernel to invalidate cache for the given node id. 847 */ 848 int fuse_reverse_inval_inode(struct super_block *sb, u64 nodeid, 849 loff_t offset, loff_t len); 850 851 /** 852 * File-system tells the kernel to invalidate parent attributes and 853 * the dentry matching parent/name. 854 * 855 * If the child_nodeid is non-zero and: 856 * - matches the inode number for the dentry matching parent/name, 857 * - is not a mount point 858 * - is a file or oan empty directory 859 * then the dentry is unhashed (d_delete()). 860 */ 861 int fuse_reverse_inval_entry(struct super_block *sb, u64 parent_nodeid, 862 u64 child_nodeid, struct qstr *name); 863 864 int fuse_do_open(struct fuse_conn *fc, u64 nodeid, struct file *file, 865 bool isdir); 866 ssize_t fuse_direct_io(struct fuse_io_priv *io, const struct iovec *iov, 867 unsigned long nr_segs, size_t count, loff_t *ppos, 868 int write); 869 long fuse_do_ioctl(struct file *file, unsigned int cmd, unsigned long arg, 870 unsigned int flags); 871 long fuse_ioctl_common(struct file *file, unsigned int cmd, 872 unsigned long arg, unsigned int flags); 873 unsigned fuse_file_poll(struct file *file, poll_table *wait); 874 int fuse_dev_release(struct inode *inode, struct file *file); 875 876 void fuse_write_update_size(struct inode *inode, loff_t pos); 877 878 int fuse_do_setattr(struct inode *inode, struct iattr *attr, 879 struct file *file); 880 881 #endif /* _FS_FUSE_I_H */ 882