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 #include <linux/xattr.h> 27 28 /** Max number of pages that can be used in a single read request */ 29 #define FUSE_MAX_PAGES_PER_REQ 32 30 31 /** Bias for fi->writectr, meaning new writepages must not be sent */ 32 #define FUSE_NOWRITE INT_MIN 33 34 /** It could be as large as PATH_MAX, but would that have any uses? */ 35 #define FUSE_NAME_MAX 1024 36 37 /** Number of dentries for each connection in the control filesystem */ 38 #define FUSE_CTL_NUM_DENTRIES 5 39 40 /** Number of page pointers embedded in fuse_req */ 41 #define FUSE_REQ_INLINE_PAGES 1 42 43 /** List of active connections */ 44 extern struct list_head fuse_conn_list; 45 46 /** Global mutex protecting fuse_conn_list and the control filesystem */ 47 extern struct mutex fuse_mutex; 48 49 /** Module parameters */ 50 extern unsigned max_user_bgreq; 51 extern unsigned max_user_congthresh; 52 53 /* One forget request */ 54 struct fuse_forget_link { 55 struct fuse_forget_one forget_one; 56 struct fuse_forget_link *next; 57 }; 58 59 /** FUSE inode */ 60 struct fuse_inode { 61 /** Inode data */ 62 struct inode inode; 63 64 /** Unique ID, which identifies the inode between userspace 65 * and kernel */ 66 u64 nodeid; 67 68 /** Number of lookups on this inode */ 69 u64 nlookup; 70 71 /** The request used for sending the FORGET message */ 72 struct fuse_forget_link *forget; 73 74 /** Time in jiffies until the file attributes are valid */ 75 u64 i_time; 76 77 /** The sticky bit in inode->i_mode may have been removed, so 78 preserve the original mode */ 79 umode_t orig_i_mode; 80 81 /** 64 bit inode number */ 82 u64 orig_ino; 83 84 /** Version of last attribute change */ 85 u64 attr_version; 86 87 /** Files usable in writepage. Protected by fc->lock */ 88 struct list_head write_files; 89 90 /** Writepages pending on truncate or fsync */ 91 struct list_head queued_writes; 92 93 /** Number of sent writes, a negative bias (FUSE_NOWRITE) 94 * means more writes are blocked */ 95 int writectr; 96 97 /** Waitq for writepage completion */ 98 wait_queue_head_t page_waitq; 99 100 /** List of writepage requestst (pending or sent) */ 101 struct list_head writepages; 102 103 /** Miscellaneous bits describing inode state */ 104 unsigned long state; 105 106 /** Lock for serializing lookup and readdir for back compatibility*/ 107 struct mutex mutex; 108 }; 109 110 /** FUSE inode state bits */ 111 enum { 112 /** Advise readdirplus */ 113 FUSE_I_ADVISE_RDPLUS, 114 /** Initialized with readdirplus */ 115 FUSE_I_INIT_RDPLUS, 116 /** An operation changing file size is in progress */ 117 FUSE_I_SIZE_UNSTABLE, 118 }; 119 120 struct fuse_conn; 121 122 /** FUSE specific file data */ 123 struct fuse_file { 124 /** Fuse connection for this file */ 125 struct fuse_conn *fc; 126 127 /** Request reserved for flush and release */ 128 struct fuse_req *reserved_req; 129 130 /** Kernel file handle guaranteed to be unique */ 131 u64 kh; 132 133 /** File handle used by userspace */ 134 u64 fh; 135 136 /** Node id of this file */ 137 u64 nodeid; 138 139 /** Refcount */ 140 atomic_t count; 141 142 /** FOPEN_* flags returned by open */ 143 u32 open_flags; 144 145 /** Entry on inode's write_files list */ 146 struct list_head write_entry; 147 148 /** RB node to be linked on fuse_conn->polled_files */ 149 struct rb_node polled_node; 150 151 /** Wait queue head for poll */ 152 wait_queue_head_t poll_wait; 153 154 /** Has flock been performed on this file? */ 155 bool flock:1; 156 }; 157 158 /** One input argument of a request */ 159 struct fuse_in_arg { 160 unsigned size; 161 const void *value; 162 }; 163 164 /** The request input */ 165 struct fuse_in { 166 /** The request header */ 167 struct fuse_in_header h; 168 169 /** True if the data for the last argument is in req->pages */ 170 unsigned argpages:1; 171 172 /** Number of arguments */ 173 unsigned numargs; 174 175 /** Array of arguments */ 176 struct fuse_in_arg args[3]; 177 }; 178 179 /** One output argument of a request */ 180 struct fuse_arg { 181 unsigned size; 182 void *value; 183 }; 184 185 /** The request output */ 186 struct fuse_out { 187 /** Header returned from userspace */ 188 struct fuse_out_header h; 189 190 /* 191 * The following bitfields are not changed during the request 192 * processing 193 */ 194 195 /** Last argument is variable length (can be shorter than 196 arg->size) */ 197 unsigned argvar:1; 198 199 /** Last argument is a list of pages to copy data to */ 200 unsigned argpages:1; 201 202 /** Zero partially or not copied pages */ 203 unsigned page_zeroing:1; 204 205 /** Pages may be replaced with new ones */ 206 unsigned page_replace:1; 207 208 /** Number or arguments */ 209 unsigned numargs; 210 211 /** Array of arguments */ 212 struct fuse_arg args[2]; 213 }; 214 215 /** FUSE page descriptor */ 216 struct fuse_page_desc { 217 unsigned int length; 218 unsigned int offset; 219 }; 220 221 struct fuse_args { 222 struct { 223 struct { 224 uint32_t opcode; 225 uint64_t nodeid; 226 } h; 227 unsigned numargs; 228 struct fuse_in_arg args[3]; 229 230 } in; 231 struct { 232 unsigned argvar:1; 233 unsigned numargs; 234 struct fuse_arg args[2]; 235 } out; 236 }; 237 238 #define FUSE_ARGS(args) struct fuse_args args = {} 239 240 /** The request IO state (for asynchronous processing) */ 241 struct fuse_io_priv { 242 struct kref refcnt; 243 int async; 244 spinlock_t lock; 245 unsigned reqs; 246 ssize_t bytes; 247 size_t size; 248 __u64 offset; 249 bool write; 250 int err; 251 struct kiocb *iocb; 252 struct file *file; 253 struct completion *done; 254 bool blocking; 255 }; 256 257 #define FUSE_IO_PRIV_SYNC(f) \ 258 { \ 259 .refcnt = KREF_INIT(1), \ 260 .async = 0, \ 261 .file = f, \ 262 } 263 264 /** 265 * Request flags 266 * 267 * FR_ISREPLY: set if the request has reply 268 * FR_FORCE: force sending of the request even if interrupted 269 * FR_BACKGROUND: request is sent in the background 270 * FR_WAITING: request is counted as "waiting" 271 * FR_ABORTED: the request was aborted 272 * FR_INTERRUPTED: the request has been interrupted 273 * FR_LOCKED: data is being copied to/from the request 274 * FR_PENDING: request is not yet in userspace 275 * FR_SENT: request is in userspace, waiting for an answer 276 * FR_FINISHED: request is finished 277 * FR_PRIVATE: request is on private list 278 */ 279 enum fuse_req_flag { 280 FR_ISREPLY, 281 FR_FORCE, 282 FR_BACKGROUND, 283 FR_WAITING, 284 FR_ABORTED, 285 FR_INTERRUPTED, 286 FR_LOCKED, 287 FR_PENDING, 288 FR_SENT, 289 FR_FINISHED, 290 FR_PRIVATE, 291 }; 292 293 /** 294 * A request to the client 295 * 296 * .waitq.lock protects the following fields: 297 * - FR_ABORTED 298 * - FR_LOCKED (may also be modified under fc->lock, tested under both) 299 */ 300 struct fuse_req { 301 /** This can be on either pending processing or io lists in 302 fuse_conn */ 303 struct list_head list; 304 305 /** Entry on the interrupts list */ 306 struct list_head intr_entry; 307 308 /** refcount */ 309 atomic_t count; 310 311 /** Unique ID for the interrupt request */ 312 u64 intr_unique; 313 314 /* Request flags, updated with test/set/clear_bit() */ 315 unsigned long flags; 316 317 /** The request input */ 318 struct fuse_in in; 319 320 /** The request output */ 321 struct fuse_out out; 322 323 /** Used to wake up the task waiting for completion of request*/ 324 wait_queue_head_t waitq; 325 326 /** Data for asynchronous requests */ 327 union { 328 struct { 329 struct fuse_release_in in; 330 struct inode *inode; 331 } release; 332 struct fuse_init_in init_in; 333 struct fuse_init_out init_out; 334 struct cuse_init_in cuse_init_in; 335 struct { 336 struct fuse_read_in in; 337 u64 attr_ver; 338 } read; 339 struct { 340 struct fuse_write_in in; 341 struct fuse_write_out out; 342 struct fuse_req *next; 343 } write; 344 struct fuse_notify_retrieve_in retrieve_in; 345 } misc; 346 347 /** page vector */ 348 struct page **pages; 349 350 /** page-descriptor vector */ 351 struct fuse_page_desc *page_descs; 352 353 /** size of the 'pages' array */ 354 unsigned max_pages; 355 356 /** inline page vector */ 357 struct page *inline_pages[FUSE_REQ_INLINE_PAGES]; 358 359 /** inline page-descriptor vector */ 360 struct fuse_page_desc inline_page_descs[FUSE_REQ_INLINE_PAGES]; 361 362 /** number of pages in vector */ 363 unsigned num_pages; 364 365 /** File used in the request (or NULL) */ 366 struct fuse_file *ff; 367 368 /** Inode used in the request or NULL */ 369 struct inode *inode; 370 371 /** AIO control block */ 372 struct fuse_io_priv *io; 373 374 /** Link on fi->writepages */ 375 struct list_head writepages_entry; 376 377 /** Request completion callback */ 378 void (*end)(struct fuse_conn *, struct fuse_req *); 379 380 /** Request is stolen from fuse_file->reserved_req */ 381 struct file *stolen_file; 382 }; 383 384 struct fuse_iqueue { 385 /** Connection established */ 386 unsigned connected; 387 388 /** Readers of the connection are waiting on this */ 389 wait_queue_head_t waitq; 390 391 /** The next unique request id */ 392 u64 reqctr; 393 394 /** The list of pending requests */ 395 struct list_head pending; 396 397 /** Pending interrupts */ 398 struct list_head interrupts; 399 400 /** Queue of pending forgets */ 401 struct fuse_forget_link forget_list_head; 402 struct fuse_forget_link *forget_list_tail; 403 404 /** Batching of FORGET requests (positive indicates FORGET batch) */ 405 int forget_batch; 406 407 /** O_ASYNC requests */ 408 struct fasync_struct *fasync; 409 }; 410 411 struct fuse_pqueue { 412 /** Connection established */ 413 unsigned connected; 414 415 /** Lock protecting accessess to members of this structure */ 416 spinlock_t lock; 417 418 /** The list of requests being processed */ 419 struct list_head processing; 420 421 /** The list of requests under I/O */ 422 struct list_head io; 423 }; 424 425 /** 426 * Fuse device instance 427 */ 428 struct fuse_dev { 429 /** Fuse connection for this device */ 430 struct fuse_conn *fc; 431 432 /** Processing queue */ 433 struct fuse_pqueue pq; 434 435 /** list entry on fc->devices */ 436 struct list_head entry; 437 }; 438 439 /** 440 * A Fuse connection. 441 * 442 * This structure is created, when the filesystem is mounted, and is 443 * destroyed, when the client device is closed and the filesystem is 444 * unmounted. 445 */ 446 struct fuse_conn { 447 /** Lock protecting accessess to members of this structure */ 448 spinlock_t lock; 449 450 /** Refcount */ 451 atomic_t count; 452 453 /** Number of fuse_dev's */ 454 atomic_t dev_count; 455 456 struct rcu_head rcu; 457 458 /** The user id for this mount */ 459 kuid_t user_id; 460 461 /** The group id for this mount */ 462 kgid_t group_id; 463 464 /** Maximum read size */ 465 unsigned max_read; 466 467 /** Maximum write size */ 468 unsigned max_write; 469 470 /** Input queue */ 471 struct fuse_iqueue iq; 472 473 /** The next unique kernel file handle */ 474 u64 khctr; 475 476 /** rbtree of fuse_files waiting for poll events indexed by ph */ 477 struct rb_root polled_files; 478 479 /** Maximum number of outstanding background requests */ 480 unsigned max_background; 481 482 /** Number of background requests at which congestion starts */ 483 unsigned congestion_threshold; 484 485 /** Number of requests currently in the background */ 486 unsigned num_background; 487 488 /** Number of background requests currently queued for userspace */ 489 unsigned active_background; 490 491 /** The list of background requests set aside for later queuing */ 492 struct list_head bg_queue; 493 494 /** Flag indicating that INIT reply has been received. Allocating 495 * any fuse request will be suspended until the flag is set */ 496 int initialized; 497 498 /** Flag indicating if connection is blocked. This will be 499 the case before the INIT reply is received, and if there 500 are too many outstading backgrounds requests */ 501 int blocked; 502 503 /** waitq for blocked connection */ 504 wait_queue_head_t blocked_waitq; 505 506 /** waitq for reserved requests */ 507 wait_queue_head_t reserved_req_waitq; 508 509 /** Connection established, cleared on umount, connection 510 abort and device release */ 511 unsigned connected; 512 513 /** Connection failed (version mismatch). Cannot race with 514 setting other bitfields since it is only set once in INIT 515 reply, before any other request, and never cleared */ 516 unsigned conn_error:1; 517 518 /** Connection successful. Only set in INIT */ 519 unsigned conn_init:1; 520 521 /** Do readpages asynchronously? Only set in INIT */ 522 unsigned async_read:1; 523 524 /** Do not send separate SETATTR request before open(O_TRUNC) */ 525 unsigned atomic_o_trunc:1; 526 527 /** Filesystem supports NFS exporting. Only set in INIT */ 528 unsigned export_support:1; 529 530 /** Set if bdi is valid */ 531 unsigned bdi_initialized:1; 532 533 /** write-back cache policy (default is write-through) */ 534 unsigned writeback_cache:1; 535 536 /** allow parallel lookups and readdir (default is serialized) */ 537 unsigned parallel_dirops:1; 538 539 /** handle fs handles killing suid/sgid/cap on write/chown/trunc */ 540 unsigned handle_killpriv:1; 541 542 /* 543 * The following bitfields are only for optimization purposes 544 * and hence races in setting them will not cause malfunction 545 */ 546 547 /** Is open/release not implemented by fs? */ 548 unsigned no_open:1; 549 550 /** Is fsync not implemented by fs? */ 551 unsigned no_fsync:1; 552 553 /** Is fsyncdir not implemented by fs? */ 554 unsigned no_fsyncdir:1; 555 556 /** Is flush not implemented by fs? */ 557 unsigned no_flush:1; 558 559 /** Is setxattr not implemented by fs? */ 560 unsigned no_setxattr:1; 561 562 /** Is getxattr not implemented by fs? */ 563 unsigned no_getxattr:1; 564 565 /** Is listxattr not implemented by fs? */ 566 unsigned no_listxattr:1; 567 568 /** Is removexattr not implemented by fs? */ 569 unsigned no_removexattr:1; 570 571 /** Are posix file locking primitives not implemented by fs? */ 572 unsigned no_lock:1; 573 574 /** Is access not implemented by fs? */ 575 unsigned no_access:1; 576 577 /** Is create not implemented by fs? */ 578 unsigned no_create:1; 579 580 /** Is interrupt not implemented by fs? */ 581 unsigned no_interrupt:1; 582 583 /** Is bmap not implemented by fs? */ 584 unsigned no_bmap:1; 585 586 /** Is poll not implemented by fs? */ 587 unsigned no_poll:1; 588 589 /** Do multi-page cached writes */ 590 unsigned big_writes:1; 591 592 /** Don't apply umask to creation modes */ 593 unsigned dont_mask:1; 594 595 /** Are BSD file locking primitives not implemented by fs? */ 596 unsigned no_flock:1; 597 598 /** Is fallocate not implemented by fs? */ 599 unsigned no_fallocate:1; 600 601 /** Is rename with flags implemented by fs? */ 602 unsigned no_rename2:1; 603 604 /** Use enhanced/automatic page cache invalidation. */ 605 unsigned auto_inval_data:1; 606 607 /** Does the filesystem support readdirplus? */ 608 unsigned do_readdirplus:1; 609 610 /** Does the filesystem want adaptive readdirplus? */ 611 unsigned readdirplus_auto:1; 612 613 /** Does the filesystem support asynchronous direct-IO submission? */ 614 unsigned async_dio:1; 615 616 /** Is lseek not implemented by fs? */ 617 unsigned no_lseek:1; 618 619 /** Does the filesystem support posix acls? */ 620 unsigned posix_acl:1; 621 622 /** Check permissions based on the file mode or not? */ 623 unsigned default_permissions:1; 624 625 /** Allow other than the mounter user to access the filesystem ? */ 626 unsigned allow_other:1; 627 628 /** The number of requests waiting for completion */ 629 atomic_t num_waiting; 630 631 /** Negotiated minor version */ 632 unsigned minor; 633 634 /** Backing dev info */ 635 struct backing_dev_info bdi; 636 637 /** Entry on the fuse_conn_list */ 638 struct list_head entry; 639 640 /** Device ID from super block */ 641 dev_t dev; 642 643 /** Dentries in the control filesystem */ 644 struct dentry *ctl_dentry[FUSE_CTL_NUM_DENTRIES]; 645 646 /** number of dentries used in the above array */ 647 int ctl_ndents; 648 649 /** Key for lock owner ID scrambling */ 650 u32 scramble_key[4]; 651 652 /** Reserved request for the DESTROY message */ 653 struct fuse_req *destroy_req; 654 655 /** Version counter for attribute changes */ 656 u64 attr_version; 657 658 /** Called on final put */ 659 void (*release)(struct fuse_conn *); 660 661 /** Super block for this connection. */ 662 struct super_block *sb; 663 664 /** Read/write semaphore to hold when accessing sb. */ 665 struct rw_semaphore killsb; 666 667 /** List of device instances belonging to this connection */ 668 struct list_head devices; 669 }; 670 671 static inline struct fuse_conn *get_fuse_conn_super(struct super_block *sb) 672 { 673 return sb->s_fs_info; 674 } 675 676 static inline struct fuse_conn *get_fuse_conn(struct inode *inode) 677 { 678 return get_fuse_conn_super(inode->i_sb); 679 } 680 681 static inline struct fuse_inode *get_fuse_inode(struct inode *inode) 682 { 683 return container_of(inode, struct fuse_inode, inode); 684 } 685 686 static inline u64 get_node_id(struct inode *inode) 687 { 688 return get_fuse_inode(inode)->nodeid; 689 } 690 691 /** Device operations */ 692 extern const struct file_operations fuse_dev_operations; 693 694 extern const struct dentry_operations fuse_dentry_operations; 695 extern const struct dentry_operations fuse_root_dentry_operations; 696 697 /** 698 * Inode to nodeid comparison. 699 */ 700 int fuse_inode_eq(struct inode *inode, void *_nodeidp); 701 702 /** 703 * Get a filled in inode 704 */ 705 struct inode *fuse_iget(struct super_block *sb, u64 nodeid, 706 int generation, struct fuse_attr *attr, 707 u64 attr_valid, u64 attr_version); 708 709 int fuse_lookup_name(struct super_block *sb, u64 nodeid, const struct qstr *name, 710 struct fuse_entry_out *outarg, struct inode **inode); 711 712 /** 713 * Send FORGET command 714 */ 715 void fuse_queue_forget(struct fuse_conn *fc, struct fuse_forget_link *forget, 716 u64 nodeid, u64 nlookup); 717 718 struct fuse_forget_link *fuse_alloc_forget(void); 719 720 /* Used by READDIRPLUS */ 721 void fuse_force_forget(struct file *file, u64 nodeid); 722 723 /** 724 * Initialize READ or READDIR request 725 */ 726 void fuse_read_fill(struct fuse_req *req, struct file *file, 727 loff_t pos, size_t count, int opcode); 728 729 /** 730 * Send OPEN or OPENDIR request 731 */ 732 int fuse_open_common(struct inode *inode, struct file *file, bool isdir); 733 734 struct fuse_file *fuse_file_alloc(struct fuse_conn *fc); 735 void fuse_file_free(struct fuse_file *ff); 736 void fuse_finish_open(struct inode *inode, struct file *file); 737 738 void fuse_sync_release(struct fuse_file *ff, int flags); 739 740 /** 741 * Send RELEASE or RELEASEDIR request 742 */ 743 void fuse_release_common(struct file *file, int opcode); 744 745 /** 746 * Send FSYNC or FSYNCDIR request 747 */ 748 int fuse_fsync_common(struct file *file, loff_t start, loff_t end, 749 int datasync, int isdir); 750 751 /** 752 * Notify poll wakeup 753 */ 754 int fuse_notify_poll_wakeup(struct fuse_conn *fc, 755 struct fuse_notify_poll_wakeup_out *outarg); 756 757 /** 758 * Initialize file operations on a regular file 759 */ 760 void fuse_init_file_inode(struct inode *inode); 761 762 /** 763 * Initialize inode operations on regular files and special files 764 */ 765 void fuse_init_common(struct inode *inode); 766 767 /** 768 * Initialize inode and file operations on a directory 769 */ 770 void fuse_init_dir(struct inode *inode); 771 772 /** 773 * Initialize inode operations on a symlink 774 */ 775 void fuse_init_symlink(struct inode *inode); 776 777 /** 778 * Change attributes of an inode 779 */ 780 void fuse_change_attributes(struct inode *inode, struct fuse_attr *attr, 781 u64 attr_valid, u64 attr_version); 782 783 void fuse_change_attributes_common(struct inode *inode, struct fuse_attr *attr, 784 u64 attr_valid); 785 786 /** 787 * Initialize the client device 788 */ 789 int fuse_dev_init(void); 790 791 /** 792 * Cleanup the client device 793 */ 794 void fuse_dev_cleanup(void); 795 796 int fuse_ctl_init(void); 797 void __exit fuse_ctl_cleanup(void); 798 799 /** 800 * Allocate a request 801 */ 802 struct fuse_req *fuse_request_alloc(unsigned npages); 803 804 struct fuse_req *fuse_request_alloc_nofs(unsigned npages); 805 806 /** 807 * Free a request 808 */ 809 void fuse_request_free(struct fuse_req *req); 810 811 /** 812 * Get a request, may fail with -ENOMEM, 813 * caller should specify # elements in req->pages[] explicitly 814 */ 815 struct fuse_req *fuse_get_req(struct fuse_conn *fc, unsigned npages); 816 struct fuse_req *fuse_get_req_for_background(struct fuse_conn *fc, 817 unsigned npages); 818 819 /* 820 * Increment reference count on request 821 */ 822 void __fuse_get_request(struct fuse_req *req); 823 824 /** 825 * Gets a requests for a file operation, always succeeds 826 */ 827 struct fuse_req *fuse_get_req_nofail_nopages(struct fuse_conn *fc, 828 struct file *file); 829 830 /** 831 * Decrement reference count of a request. If count goes to zero free 832 * the request. 833 */ 834 void fuse_put_request(struct fuse_conn *fc, struct fuse_req *req); 835 836 /** 837 * Send a request (synchronous) 838 */ 839 void fuse_request_send(struct fuse_conn *fc, struct fuse_req *req); 840 841 /** 842 * Simple request sending that does request allocation and freeing 843 */ 844 ssize_t fuse_simple_request(struct fuse_conn *fc, struct fuse_args *args); 845 846 /** 847 * Send a request in the background 848 */ 849 void fuse_request_send_background(struct fuse_conn *fc, struct fuse_req *req); 850 851 void fuse_request_send_background_locked(struct fuse_conn *fc, 852 struct fuse_req *req); 853 854 /* Abort all requests */ 855 void fuse_abort_conn(struct fuse_conn *fc); 856 857 /** 858 * Invalidate inode attributes 859 */ 860 void fuse_invalidate_attr(struct inode *inode); 861 862 void fuse_invalidate_entry_cache(struct dentry *entry); 863 864 void fuse_invalidate_atime(struct inode *inode); 865 866 /** 867 * Acquire reference to fuse_conn 868 */ 869 struct fuse_conn *fuse_conn_get(struct fuse_conn *fc); 870 871 /** 872 * Initialize fuse_conn 873 */ 874 void fuse_conn_init(struct fuse_conn *fc); 875 876 /** 877 * Release reference to fuse_conn 878 */ 879 void fuse_conn_put(struct fuse_conn *fc); 880 881 struct fuse_dev *fuse_dev_alloc(struct fuse_conn *fc); 882 void fuse_dev_free(struct fuse_dev *fud); 883 884 /** 885 * Add connection to control filesystem 886 */ 887 int fuse_ctl_add_conn(struct fuse_conn *fc); 888 889 /** 890 * Remove connection from control filesystem 891 */ 892 void fuse_ctl_remove_conn(struct fuse_conn *fc); 893 894 /** 895 * Is file type valid? 896 */ 897 int fuse_valid_type(int m); 898 899 /** 900 * Is current process allowed to perform filesystem operation? 901 */ 902 int fuse_allow_current_process(struct fuse_conn *fc); 903 904 u64 fuse_lock_owner_id(struct fuse_conn *fc, fl_owner_t id); 905 906 void fuse_update_ctime(struct inode *inode); 907 908 int fuse_update_attributes(struct inode *inode, struct kstat *stat, 909 struct file *file, bool *refreshed); 910 911 void fuse_flush_writepages(struct inode *inode); 912 913 void fuse_set_nowrite(struct inode *inode); 914 void fuse_release_nowrite(struct inode *inode); 915 916 u64 fuse_get_attr_version(struct fuse_conn *fc); 917 918 /** 919 * File-system tells the kernel to invalidate cache for the given node id. 920 */ 921 int fuse_reverse_inval_inode(struct super_block *sb, u64 nodeid, 922 loff_t offset, loff_t len); 923 924 /** 925 * File-system tells the kernel to invalidate parent attributes and 926 * the dentry matching parent/name. 927 * 928 * If the child_nodeid is non-zero and: 929 * - matches the inode number for the dentry matching parent/name, 930 * - is not a mount point 931 * - is a file or oan empty directory 932 * then the dentry is unhashed (d_delete()). 933 */ 934 int fuse_reverse_inval_entry(struct super_block *sb, u64 parent_nodeid, 935 u64 child_nodeid, struct qstr *name); 936 937 int fuse_do_open(struct fuse_conn *fc, u64 nodeid, struct file *file, 938 bool isdir); 939 940 /** 941 * fuse_direct_io() flags 942 */ 943 944 /** If set, it is WRITE; otherwise - READ */ 945 #define FUSE_DIO_WRITE (1 << 0) 946 947 /** CUSE pass fuse_direct_io() a file which f_mapping->host is not from FUSE */ 948 #define FUSE_DIO_CUSE (1 << 1) 949 950 ssize_t fuse_direct_io(struct fuse_io_priv *io, struct iov_iter *iter, 951 loff_t *ppos, int flags); 952 long fuse_do_ioctl(struct file *file, unsigned int cmd, unsigned long arg, 953 unsigned int flags); 954 long fuse_ioctl_common(struct file *file, unsigned int cmd, 955 unsigned long arg, unsigned int flags); 956 unsigned fuse_file_poll(struct file *file, poll_table *wait); 957 int fuse_dev_release(struct inode *inode, struct file *file); 958 959 bool fuse_write_update_size(struct inode *inode, loff_t pos); 960 961 int fuse_flush_times(struct inode *inode, struct fuse_file *ff); 962 int fuse_write_inode(struct inode *inode, struct writeback_control *wbc); 963 964 int fuse_do_setattr(struct dentry *dentry, struct iattr *attr, 965 struct file *file); 966 967 void fuse_set_initialized(struct fuse_conn *fc); 968 969 void fuse_unlock_inode(struct inode *inode); 970 void fuse_lock_inode(struct inode *inode); 971 972 int fuse_setxattr(struct inode *inode, const char *name, const void *value, 973 size_t size, int flags); 974 ssize_t fuse_getxattr(struct inode *inode, const char *name, void *value, 975 size_t size); 976 ssize_t fuse_listxattr(struct dentry *entry, char *list, size_t size); 977 int fuse_removexattr(struct inode *inode, const char *name); 978 extern const struct xattr_handler *fuse_xattr_handlers[]; 979 extern const struct xattr_handler *fuse_acl_xattr_handlers[]; 980 981 struct posix_acl; 982 struct posix_acl *fuse_get_acl(struct inode *inode, int type); 983 int fuse_set_acl(struct inode *inode, struct posix_acl *acl, int type); 984 985 #endif /* _FS_FUSE_I_H */ 986