fs/fuse/fuse_i.h

   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 };
 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[3];
 213 };
 214
 215 /** FUSE page descriptor */
 216 struct fuse_page_desc {
 217         unsigned int length;
 218         unsigned int offset;
 219 };
 220
 221 /** The request state */
 222 enum fuse_req_state {
 223         FUSE_REQ_INIT = 0,
 224         FUSE_REQ_PENDING,
 225         FUSE_REQ_READING,
 226         FUSE_REQ_SENT,
 227         FUSE_REQ_WRITING,
 228         FUSE_REQ_FINISHED
 229 };
 230
 231 /**
 232  * A request to the client
 233  */
 234 struct fuse_req {
 235         /** This can be on either pending processing or io lists in
 236             fuse_conn */
 237         struct list_head list;
 238
 239         /** Entry on the interrupts list  */
 240         struct list_head intr_entry;
 241
 242         /** refcount */
 243         atomic_t count;
 244
 245         /** Unique ID for the interrupt request */
 246         u64 intr_unique;
 247
 248         /*
 249          * The following bitfields are either set once before the
 250          * request is queued or setting/clearing them is protected by
 251          * fuse_conn->lock
 252          */
 253
 254         /** True if the request has reply */
 255         unsigned isreply:1;
 256
 257         /** Force sending of the request even if interrupted */
 258         unsigned force:1;
 259
 260         /** The request was aborted */
 261         unsigned aborted:1;
 262
 263         /** Request is sent in the background */
 264         unsigned background:1;
 265
 266         /** The request has been interrupted */
 267         unsigned interrupted:1;
 268
 269         /** Data is being copied to/from the request */
 270         unsigned locked:1;
 271
 272         /** Request is counted as "waiting" */
 273         unsigned waiting:1;
 274
 275         /** State of the request */
 276         enum fuse_req_state state;
 277
 278         /** The request input */
 279         struct fuse_in in;
 280
 281         /** The request output */
 282         struct fuse_out out;
 283
 284         /** Used to wake up the task waiting for completion of request*/
 285         wait_queue_head_t waitq;
 286
 287         /** Data for asynchronous requests */
 288         union {
 289                 struct {
 290                         union {
 291                                 struct fuse_release_in in;
 292                                 struct work_struct work;
 293                         };
 294                         struct path path;
 295                 } release;
 296                 struct fuse_init_in init_in;
 297                 struct fuse_init_out init_out;
 298                 struct cuse_init_in cuse_init_in;
 299                 struct {
 300                         struct fuse_read_in in;
 301                         u64 attr_ver;
 302                 } read;
 303                 struct {
 304                         struct fuse_write_in in;
 305                         struct fuse_write_out out;
 306                 } write;
 307                 struct fuse_notify_retrieve_in retrieve_in;
 308                 struct fuse_lk_in lk_in;
 309         } misc;
 310
 311         /** page vector */
 312         struct page **pages;
 313
 314         /** page-descriptor vector */
 315         struct fuse_page_desc *page_descs;
 316
 317         /** size of the 'pages' array */
 318         unsigned max_pages;
 319
 320         /** inline page vector */
 321         struct page *inline_pages[FUSE_REQ_INLINE_PAGES];
 322
 323         /** inline page-descriptor vector */
 324         struct fuse_page_desc inline_page_descs[FUSE_REQ_INLINE_PAGES];
 325
 326         /** number of pages in vector */
 327         unsigned num_pages;
 328
 329         /** File used in the request (or NULL) */
 330         struct fuse_file *ff;
 331
 332         /** Inode used in the request or NULL */
 333         struct inode *inode;
 334
 335         /** Link on fi->writepages */
 336         struct list_head writepages_entry;
 337
 338         /** Request completion callback */
 339         void (*end)(struct fuse_conn *, struct fuse_req *);
 340
 341         /** Request is stolen from fuse_file->reserved_req */
 342         struct file *stolen_file;
 343 };
 344
 345 /**
 346  * A Fuse connection.
 347  *
 348  * This structure is created, when the filesystem is mounted, and is
 349  * destroyed, when the client device is closed and the filesystem is
 350  * unmounted.
 351  */
 352 struct fuse_conn {
 353         /** Lock protecting accessess to  members of this structure */
 354         spinlock_t lock;
 355
 356         /** Mutex protecting against directory alias creation */
 357         struct mutex inst_mutex;
 358
 359         /** Refcount */
 360         atomic_t count;
 361
 362         /** The user id for this mount */
 363         kuid_t user_id;
 364
 365         /** The group id for this mount */
 366         kgid_t group_id;
 367
 368         /** The fuse mount flags for this mount */
 369         unsigned flags;
 370
 371         /** Maximum read size */
 372         unsigned max_read;
 373
 374         /** Maximum write size */
 375         unsigned max_write;
 376
 377         /** Readers of the connection are waiting on this */
 378         wait_queue_head_t waitq;
 379
 380         /** The list of pending requests */
 381         struct list_head pending;
 382
 383         /** The list of requests being processed */
 384         struct list_head processing;
 385
 386         /** The list of requests under I/O */
 387         struct list_head io;
 388
 389         /** The next unique kernel file handle */
 390         u64 khctr;
 391
 392         /** rbtree of fuse_files waiting for poll events indexed by ph */
 393         struct rb_root polled_files;
 394
 395         /** Maximum number of outstanding background requests */
 396         unsigned max_background;
 397
 398         /** Number of background requests at which congestion starts */
 399         unsigned congestion_threshold;
 400
 401         /** Number of requests currently in the background */
 402         unsigned num_background;
 403
 404         /** Number of background requests currently queued for userspace */
 405         unsigned active_background;
 406
 407         /** The list of background requests set aside for later queuing */
 408         struct list_head bg_queue;
 409
 410         /** Pending interrupts */
 411         struct list_head interrupts;
 412
 413         /** Queue of pending forgets */
 414         struct fuse_forget_link forget_list_head;
 415         struct fuse_forget_link *forget_list_tail;
 416
 417         /** Batching of FORGET requests (positive indicates FORGET batch) */
 418         int forget_batch;
 419
 420         /** Flag indicating if connection is blocked.  This will be
 421             the case before the INIT reply is received, and if there
 422             are too many outstading backgrounds requests */
 423         int blocked;
 424
 425         /** waitq for blocked connection */
 426         wait_queue_head_t blocked_waitq;
 427
 428         /** waitq for reserved requests */
 429         wait_queue_head_t reserved_req_waitq;
 430
 431         /** The next unique request id */
 432         u64 reqctr;
 433
 434         /** Connection established, cleared on umount, connection
 435             abort and device release */
 436         unsigned connected;
 437
 438         /** Connection failed (version mismatch).  Cannot race with
 439             setting other bitfields since it is only set once in INIT
 440             reply, before any other request, and never cleared */
 441         unsigned conn_error:1;
 442
 443         /** Connection successful.  Only set in INIT */
 444         unsigned conn_init:1;
 445
 446         /** Do readpages asynchronously?  Only set in INIT */
 447         unsigned async_read:1;
 448
 449         /** Do not send separate SETATTR request before open(O_TRUNC)  */
 450         unsigned atomic_o_trunc:1;
 451
 452         /** Filesystem supports NFS exporting.  Only set in INIT */
 453         unsigned export_support:1;
 454
 455         /** Set if bdi is valid */
 456         unsigned bdi_initialized:1;
 457
 458         /*
 459          * The following bitfields are only for optimization purposes
 460          * and hence races in setting them will not cause malfunction
 461          */
 462
 463         /** Is fsync not implemented by fs? */
 464         unsigned no_fsync:1;
 465
 466         /** Is fsyncdir not implemented by fs? */
 467         unsigned no_fsyncdir:1;
 468
 469         /** Is flush not implemented by fs? */
 470         unsigned no_flush:1;
 471
 472         /** Is setxattr not implemented by fs? */
 473         unsigned no_setxattr:1;
 474
 475         /** Is getxattr not implemented by fs? */
 476         unsigned no_getxattr:1;
 477
 478         /** Is listxattr not implemented by fs? */
 479         unsigned no_listxattr:1;
 480
 481         /** Is removexattr not implemented by fs? */
 482         unsigned no_removexattr:1;
 483
 484         /** Are posix file locking primitives not implemented by fs? */
 485         unsigned no_lock:1;
 486
 487         /** Is access not implemented by fs? */
 488         unsigned no_access:1;
 489
 490         /** Is create not implemented by fs? */
 491         unsigned no_create:1;
 492
 493         /** Is interrupt not implemented by fs? */
 494         unsigned no_interrupt:1;
 495
 496         /** Is bmap not implemented by fs? */
 497         unsigned no_bmap:1;
 498
 499         /** Is poll not implemented by fs? */
 500         unsigned no_poll:1;
 501
 502         /** Do multi-page cached writes */
 503         unsigned big_writes:1;
 504
 505         /** Don't apply umask to creation modes */
 506         unsigned dont_mask:1;
 507
 508         /** Are BSD file locking primitives not implemented by fs? */
 509         unsigned no_flock:1;
 510
 511         /** Is fallocate not implemented by fs? */
 512         unsigned no_fallocate:1;
 513
 514         /** Use enhanced/automatic page cache invalidation. */
 515         unsigned auto_inval_data:1;
 516
 517         /** Does the filesystem support readdirplus? */
 518         unsigned do_readdirplus:1;
 519
 520         /** Does the filesystem want adaptive readdirplus? */
 521         unsigned readdirplus_auto:1;
 522
 523         /** The number of requests waiting for completion */
 524         atomic_t num_waiting;
 525
 526         /** Negotiated minor version */
 527         unsigned minor;
 528
 529         /** Backing dev info */
 530         struct backing_dev_info bdi;
 531
 532         /** Entry on the fuse_conn_list */
 533         struct list_head entry;
 534
 535         /** Device ID from super block */
 536         dev_t dev;
 537
 538         /** Dentries in the control filesystem */
 539         struct dentry *ctl_dentry[FUSE_CTL_NUM_DENTRIES];
 540
 541         /** number of dentries used in the above array */
 542         int ctl_ndents;
 543
 544         /** O_ASYNC requests */
 545         struct fasync_struct *fasync;
 546
 547         /** Key for lock owner ID scrambling */
 548         u32 scramble_key[4];
 549
 550         /** Reserved request for the DESTROY message */
 551         struct fuse_req *destroy_req;
 552
 553         /** Version counter for attribute changes */
 554         u64 attr_version;
 555
 556         /** Called on final put */
 557         void (*release)(struct fuse_conn *);
 558
 559         /** Super block for this connection. */
 560         struct super_block *sb;
 561
 562         /** Read/write semaphore to hold when accessing sb. */
 563         struct rw_semaphore killsb;
 564 };
 565
 566 static inline struct fuse_conn *get_fuse_conn_super(struct super_block *sb)
 567 {
 568         return sb->s_fs_info;
 569 }
 570
 571 static inline struct fuse_conn *get_fuse_conn(struct inode *inode)
 572 {
 573         return get_fuse_conn_super(inode->i_sb);
 574 }
 575
 576 static inline struct fuse_inode *get_fuse_inode(struct inode *inode)
 577 {
 578         return container_of(inode, struct fuse_inode, inode);
 579 }
 580
 581 static inline u64 get_node_id(struct inode *inode)
 582 {
 583         return get_fuse_inode(inode)->nodeid;
 584 }
 585
 586 /** Device operations */
 587 extern const struct file_operations fuse_dev_operations;
 588
 589 extern const struct dentry_operations fuse_dentry_operations;
 590
 591 /**
 592  * Inode to nodeid comparison.
 593  */
 594 int fuse_inode_eq(struct inode *inode, void *_nodeidp);
 595
 596 /**
 597  * Get a filled in inode
 598  */
 599 struct inode *fuse_iget(struct super_block *sb, u64 nodeid,
 600                         int generation, struct fuse_attr *attr,
 601                         u64 attr_valid, u64 attr_version);
 602
 603 int fuse_lookup_name(struct super_block *sb, u64 nodeid, struct qstr *name,
 604                      struct fuse_entry_out *outarg, struct inode **inode);
 605
 606 /**
 607  * Send FORGET command
 608  */
 609 void fuse_queue_forget(struct fuse_conn *fc, struct fuse_forget_link *forget,
 610                        u64 nodeid, u64 nlookup);
 611
 612 struct fuse_forget_link *fuse_alloc_forget(void);
 613
 614 /* Used by READDIRPLUS */
 615 void fuse_force_forget(struct file *file, u64 nodeid);
 616
 617 /**
 618  * Initialize READ or READDIR request
 619  */
 620 void fuse_read_fill(struct fuse_req *req, struct file *file,
 621                     loff_t pos, size_t count, int opcode);
 622
 623 /**
 624  * Send OPEN or OPENDIR request
 625  */
 626 int fuse_open_common(struct inode *inode, struct file *file, bool isdir);
 627
 628 struct fuse_file *fuse_file_alloc(struct fuse_conn *fc);
 629 struct fuse_file *fuse_file_get(struct fuse_file *ff);
 630 void fuse_file_free(struct fuse_file *ff);
 631 void fuse_finish_open(struct inode *inode, struct file *file);
 632
 633 void fuse_sync_release(struct fuse_file *ff, int flags);
 634
 635 /**
 636  * Send RELEASE or RELEASEDIR request
 637  */
 638 void fuse_release_common(struct file *file, int opcode);
 639
 640 /**
 641  * Send FSYNC or FSYNCDIR request
 642  */
 643 int fuse_fsync_common(struct file *file, loff_t start, loff_t end,
 644                       int datasync, int isdir);
 645
 646 /**
 647  * Notify poll wakeup
 648  */
 649 int fuse_notify_poll_wakeup(struct fuse_conn *fc,
 650                             struct fuse_notify_poll_wakeup_out *outarg);
 651
 652 /**
 653  * Initialize file operations on a regular file
 654  */
 655 void fuse_init_file_inode(struct inode *inode);
 656
 657 /**
 658  * Initialize inode operations on regular files and special files
 659  */
 660 void fuse_init_common(struct inode *inode);
 661
 662 /**
 663  * Initialize inode and file operations on a directory
 664  */
 665 void fuse_init_dir(struct inode *inode);
 666
 667 /**
 668  * Initialize inode operations on a symlink
 669  */
 670 void fuse_init_symlink(struct inode *inode);
 671
 672 /**
 673  * Change attributes of an inode
 674  */
 675 void fuse_change_attributes(struct inode *inode, struct fuse_attr *attr,
 676                             u64 attr_valid, u64 attr_version);
 677
 678 void fuse_change_attributes_common(struct inode *inode, struct fuse_attr *attr,
 679                                    u64 attr_valid);
 680
 681 /**
 682  * Initialize the client device
 683  */
 684 int fuse_dev_init(void);
 685
 686 /**
 687  * Cleanup the client device
 688  */
 689 void fuse_dev_cleanup(void);
 690
 691 int fuse_ctl_init(void);
 692 void fuse_ctl_cleanup(void);
 693
 694 /**
 695  * Allocate a request
 696  */
 697 struct fuse_req *fuse_request_alloc(unsigned npages);
 698
 699 struct fuse_req *fuse_request_alloc_nofs(unsigned npages);
 700
 701 /**
 702  * Free a request
 703  */
 704 void fuse_request_free(struct fuse_req *req);
 705
 706 /**
 707  * Get a request, may fail with -ENOMEM,
 708  * caller should specify # elements in req->pages[] explicitly
 709  */
 710 struct fuse_req *fuse_get_req(struct fuse_conn *fc, unsigned npages);
 711
 712 /**
 713  * Get a request, may fail with -ENOMEM,
 714  * useful for callers who doesn't use req->pages[]
 715  */
 716 static inline struct fuse_req *fuse_get_req_nopages(struct fuse_conn *fc)
 717 {
 718         return fuse_get_req(fc, 0);
 719 }
 720
 721 /**
 722  * Gets a requests for a file operation, always succeeds
 723  */
 724 struct fuse_req *fuse_get_req_nofail_nopages(struct fuse_conn *fc,
 725                                              struct file *file);
 726
 727 /**
 728  * Decrement reference count of a request.  If count goes to zero free
 729  * the request.
 730  */
 731 void fuse_put_request(struct fuse_conn *fc, struct fuse_req *req);
 732
 733 /**
 734  * Send a request (synchronous)
 735  */
 736 void fuse_request_send(struct fuse_conn *fc, struct fuse_req *req);
 737
 738 /**
 739  * Send a request in the background
 740  */
 741 void fuse_request_send_background(struct fuse_conn *fc, struct fuse_req *req);
 742
 743 void fuse_request_send_background_locked(struct fuse_conn *fc,
 744                                          struct fuse_req *req);
 745
 746 /* Abort all requests */
 747 void fuse_abort_conn(struct fuse_conn *fc);
 748
 749 /**
 750  * Invalidate inode attributes
 751  */
 752 void fuse_invalidate_attr(struct inode *inode);
 753
 754 void fuse_invalidate_entry_cache(struct dentry *entry);
 755
 756 /**
 757  * Acquire reference to fuse_conn
 758  */
 759 struct fuse_conn *fuse_conn_get(struct fuse_conn *fc);
 760
 761 void fuse_conn_kill(struct fuse_conn *fc);
 762
 763 /**
 764  * Initialize fuse_conn
 765  */
 766 void fuse_conn_init(struct fuse_conn *fc);
 767
 768 /**
 769  * Release reference to fuse_conn
 770  */
 771 void fuse_conn_put(struct fuse_conn *fc);
 772
 773 /**
 774  * Add connection to control filesystem
 775  */
 776 int fuse_ctl_add_conn(struct fuse_conn *fc);
 777
 778 /**
 779  * Remove connection from control filesystem
 780  */
 781 void fuse_ctl_remove_conn(struct fuse_conn *fc);
 782
 783 /**
 784  * Is file type valid?
 785  */
 786 int fuse_valid_type(int m);
 787
 788 /**
 789  * Is current process allowed to perform filesystem operation?
 790  */
 791 int fuse_allow_current_process(struct fuse_conn *fc);
 792
 793 u64 fuse_lock_owner_id(struct fuse_conn *fc, fl_owner_t id);
 794
 795 int fuse_update_attributes(struct inode *inode, struct kstat *stat,
 796                            struct file *file, bool *refreshed);
 797
 798 void fuse_flush_writepages(struct inode *inode);
 799
 800 void fuse_set_nowrite(struct inode *inode);
 801 void fuse_release_nowrite(struct inode *inode);
 802
 803 u64 fuse_get_attr_version(struct fuse_conn *fc);
 804
 805 /**
 806  * File-system tells the kernel to invalidate cache for the given node id.
 807  */
 808 int fuse_reverse_inval_inode(struct super_block *sb, u64 nodeid,
 809                              loff_t offset, loff_t len);
 810
 811 /**
 812  * File-system tells the kernel to invalidate parent attributes and
 813  * the dentry matching parent/name.
 814  *
 815  * If the child_nodeid is non-zero and:
 816  *    - matches the inode number for the dentry matching parent/name,
 817  *    - is not a mount point
 818  *    - is a file or oan empty directory
 819  * then the dentry is unhashed (d_delete()).
 820  */
 821 int fuse_reverse_inval_entry(struct super_block *sb, u64 parent_nodeid,
 822                              u64 child_nodeid, struct qstr *name);
 823
 824 int fuse_do_open(struct fuse_conn *fc, u64 nodeid, struct file *file,
 825                  bool isdir);
 826 ssize_t fuse_direct_io(struct file *file, const struct iovec *iov,
 827                        unsigned long nr_segs, size_t count, loff_t *ppos,
 828                        int write);
 829 long fuse_do_ioctl(struct file *file, unsigned int cmd, unsigned long arg,
 830                    unsigned int flags);
 831 long fuse_ioctl_common(struct file *file, unsigned int cmd,
 832                        unsigned long arg, unsigned int flags);
 833 unsigned fuse_file_poll(struct file *file, poll_table *wait);
 834 int fuse_dev_release(struct inode *inode, struct file *file);
 835
 836 void fuse_write_update_size(struct inode *inode, loff_t pos);
 837
 838 #endif /* _FS_FUSE_I_H */