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