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