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         /** Initialized with readdirplus */
 119         FUSE_I_INIT_RDPLUS,
 120         /** An operation changing file size is in progress  */
 121         FUSE_I_SIZE_UNSTABLE,
 122 };
 123
 124 struct fuse_conn;
 125
 126 /** FUSE specific file data */
 127 struct fuse_file {
 128         /** Fuse connection for this file */
 129         struct fuse_conn *fc;
 130
 131         /** Request reserved for flush and release */
 132         struct fuse_req *reserved_req;
 133
 134         /** Kernel file handle guaranteed to be unique */
 135         u64 kh;
 136
 137         /** File handle used by userspace */
 138         u64 fh;
 139
 140         /** Node id of this file */
 141         u64 nodeid;
 142
 143         /** Refcount */
 144         atomic_t count;
 145
 146         /** FOPEN_* flags returned by open */
 147         u32 open_flags;
 148
 149         /** Entry on inode's write_files list */
 150         struct list_head write_entry;
 151
 152         /** RB node to be linked on fuse_conn->polled_files */
 153         struct rb_node polled_node;
 154
 155         /** Wait queue head for poll */
 156         wait_queue_head_t poll_wait;
 157
 158         /** Has flock been performed on this file? */
 159         bool flock:1;
 160 };
 161
 162 /** One input argument of a request */
 163 struct fuse_in_arg {
 164         unsigned size;
 165         const void *value;
 166 };
 167
 168 /** The request input */
 169 struct fuse_in {
 170         /** The request header */
 171         struct fuse_in_header h;
 172
 173         /** True if the data for the last argument is in req->pages */
 174         unsigned argpages:1;
 175
 176         /** Number of arguments */
 177         unsigned numargs;
 178
 179         /** Array of arguments */
 180         struct fuse_in_arg args[3];
 181 };
 182
 183 /** One output argument of a request */
 184 struct fuse_arg {
 185         unsigned size;
 186         void *value;
 187 };
 188
 189 /** The request output */
 190 struct fuse_out {
 191         /** Header returned from userspace */
 192         struct fuse_out_header h;
 193
 194         /*
 195          * The following bitfields are not changed during the request
 196          * processing
 197          */
 198
 199         /** Last argument is variable length (can be shorter than
 200             arg->size) */
 201         unsigned argvar:1;
 202
 203         /** Last argument is a list of pages to copy data to */
 204         unsigned argpages:1;
 205
 206         /** Zero partially or not copied pages */
 207         unsigned page_zeroing:1;
 208
 209         /** Pages may be replaced with new ones */
 210         unsigned page_replace:1;
 211
 212         /** Number or arguments */
 213         unsigned numargs;
 214
 215         /** Array of arguments */
 216         struct fuse_arg args[2];
 217 };
 218
 219 /** FUSE page descriptor */
 220 struct fuse_page_desc {
 221         unsigned int length;
 222         unsigned int offset;
 223 };
 224
 225 struct fuse_args {
 226         struct {
 227                 struct {
 228                         uint32_t opcode;
 229                         uint64_t nodeid;
 230                 } h;
 231                 unsigned numargs;
 232                 struct fuse_in_arg args[3];
 233
 234         } in;
 235         struct {
 236                 unsigned argvar:1;
 237                 unsigned numargs;
 238                 struct fuse_arg args[2];
 239         } out;
 240 };
 241
 242 #define FUSE_ARGS(args) struct fuse_args args = {}
 243
 244 /** The request state */
 245 enum fuse_req_state {
 246         FUSE_REQ_INIT = 0,
 247         FUSE_REQ_PENDING,
 248         FUSE_REQ_READING,
 249         FUSE_REQ_SENT,
 250         FUSE_REQ_WRITING,
 251         FUSE_REQ_FINISHED
 252 };
 253
 254 /** The request IO state (for asynchronous processing) */
 255 struct fuse_io_priv {
 256         int async;
 257         spinlock_t lock;
 258         unsigned reqs;
 259         ssize_t bytes;
 260         size_t size;
 261         __u64 offset;
 262         bool write;
 263         int err;
 264         struct kiocb *iocb;
 265         struct file *file;
 266         struct completion *done;
 267 };
 268
 269 /**
 270  * Request flags
 271  *
 272  * FR_ISREPLY:          set if the request has reply
 273  * FR_FORCE:            force sending of the request even if interrupted
 274  * FR_BACKGROUND:       request is sent in the background
 275  * FR_WAITING:          request is counted as "waiting"
 276  * FR_ABORTED:          the request was aborted
 277  * FR_INTERRUPTED:      the request has been interrupted
 278  * FR_LOCKED:           data is being copied to/from the request
 279  */
 280 enum fuse_req_flag {
 281         FR_ISREPLY,
 282         FR_FORCE,
 283         FR_BACKGROUND,
 284         FR_WAITING,
 285         FR_ABORTED,
 286         FR_INTERRUPTED,
 287         FR_LOCKED,
 288 };
 289
 290 /**
 291  * A request to the client
 292  *
 293  * .waitq.lock protects the following fields:
 294  *   - FR_ABORTED
 295  *   - FR_LOCKED (may also be modified under fc->lock, tested under both)
 296  */
 297 struct fuse_req {
 298         /** This can be on either pending processing or io lists in
 299             fuse_conn */
 300         struct list_head list;
 301
 302         /** Entry on the interrupts list  */
 303         struct list_head intr_entry;
 304
 305         /** refcount */
 306         atomic_t count;
 307
 308         /** Unique ID for the interrupt request */
 309         u64 intr_unique;
 310
 311         /* Request flags, updated with test/set/clear_bit() */
 312         unsigned long flags;
 313
 314         /** State of the request */
 315         enum fuse_req_state state;
 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 /**
 385  * A Fuse connection.
 386  *
 387  * This structure is created, when the filesystem is mounted, and is
 388  * destroyed, when the client device is closed and the filesystem is
 389  * unmounted.
 390  */
 391 struct fuse_conn {
 392         /** Lock protecting accessess to  members of this structure */
 393         spinlock_t lock;
 394
 395         /** Refcount */
 396         atomic_t count;
 397
 398         struct rcu_head rcu;
 399
 400         /** The user id for this mount */
 401         kuid_t user_id;
 402
 403         /** The group id for this mount */
 404         kgid_t group_id;
 405
 406         /** The fuse mount flags for this mount */
 407         unsigned flags;
 408
 409         /** Maximum read size */
 410         unsigned max_read;
 411
 412         /** Maximum write size */
 413         unsigned max_write;
 414
 415         /** Readers of the connection are waiting on this */
 416         wait_queue_head_t waitq;
 417
 418         /** The list of pending requests */
 419         struct list_head pending;
 420
 421         /** The list of requests being processed */
 422         struct list_head processing;
 423
 424         /** The list of requests under I/O */
 425         struct list_head io;
 426
 427         /** The next unique kernel file handle */
 428         u64 khctr;
 429
 430         /** rbtree of fuse_files waiting for poll events indexed by ph */
 431         struct rb_root polled_files;
 432
 433         /** Maximum number of outstanding background requests */
 434         unsigned max_background;
 435
 436         /** Number of background requests at which congestion starts */
 437         unsigned congestion_threshold;
 438
 439         /** Number of requests currently in the background */
 440         unsigned num_background;
 441
 442         /** Number of background requests currently queued for userspace */
 443         unsigned active_background;
 444
 445         /** The list of background requests set aside for later queuing */
 446         struct list_head bg_queue;
 447
 448         /** Pending interrupts */
 449         struct list_head interrupts;
 450
 451         /** Queue of pending forgets */
 452         struct fuse_forget_link forget_list_head;
 453         struct fuse_forget_link *forget_list_tail;
 454
 455         /** Batching of FORGET requests (positive indicates FORGET batch) */
 456         int forget_batch;
 457
 458         /** Flag indicating that INIT reply has been received. Allocating
 459          * any fuse request will be suspended until the flag is set */
 460         int initialized;
 461
 462         /** Flag indicating if connection is blocked.  This will be
 463             the case before the INIT reply is received, and if there
 464             are too many outstading backgrounds requests */
 465         int blocked;
 466
 467         /** waitq for blocked connection */
 468         wait_queue_head_t blocked_waitq;
 469
 470         /** waitq for reserved requests */
 471         wait_queue_head_t reserved_req_waitq;
 472
 473         /** The next unique request id */
 474         u64 reqctr;
 475
 476         /** Connection established, cleared on umount, connection
 477             abort and device release */
 478         unsigned connected;
 479
 480         /** Connection failed (version mismatch).  Cannot race with
 481             setting other bitfields since it is only set once in INIT
 482             reply, before any other request, and never cleared */
 483         unsigned conn_error:1;
 484
 485         /** Connection successful.  Only set in INIT */
 486         unsigned conn_init:1;
 487
 488         /** Do readpages asynchronously?  Only set in INIT */
 489         unsigned async_read:1;
 490
 491         /** Do not send separate SETATTR request before open(O_TRUNC)  */
 492         unsigned atomic_o_trunc:1;
 493
 494         /** Filesystem supports NFS exporting.  Only set in INIT */
 495         unsigned export_support:1;
 496
 497         /** Set if bdi is valid */
 498         unsigned bdi_initialized:1;
 499
 500         /** write-back cache policy (default is write-through) */
 501         unsigned writeback_cache:1;
 502
 503         /*
 504          * The following bitfields are only for optimization purposes
 505          * and hence races in setting them will not cause malfunction
 506          */
 507
 508         /** Is open/release not implemented by fs? */
 509         unsigned no_open:1;
 510
 511         /** Is fsync not implemented by fs? */
 512         unsigned no_fsync:1;
 513
 514         /** Is fsyncdir not implemented by fs? */
 515         unsigned no_fsyncdir:1;
 516
 517         /** Is flush not implemented by fs? */
 518         unsigned no_flush:1;
 519
 520         /** Is setxattr not implemented by fs? */
 521         unsigned no_setxattr:1;
 522
 523         /** Is getxattr not implemented by fs? */
 524         unsigned no_getxattr:1;
 525
 526         /** Is listxattr not implemented by fs? */
 527         unsigned no_listxattr:1;
 528
 529         /** Is removexattr not implemented by fs? */
 530         unsigned no_removexattr:1;
 531
 532         /** Are posix file locking primitives not implemented by fs? */
 533         unsigned no_lock:1;
 534
 535         /** Is access not implemented by fs? */
 536         unsigned no_access:1;
 537
 538         /** Is create not implemented by fs? */
 539         unsigned no_create:1;
 540
 541         /** Is interrupt not implemented by fs? */
 542         unsigned no_interrupt:1;
 543
 544         /** Is bmap not implemented by fs? */
 545         unsigned no_bmap:1;
 546
 547         /** Is poll not implemented by fs? */
 548         unsigned no_poll:1;
 549
 550         /** Do multi-page cached writes */
 551         unsigned big_writes:1;
 552
 553         /** Don't apply umask to creation modes */
 554         unsigned dont_mask:1;
 555
 556         /** Are BSD file locking primitives not implemented by fs? */
 557         unsigned no_flock:1;
 558
 559         /** Is fallocate not implemented by fs? */
 560         unsigned no_fallocate:1;
 561
 562         /** Is rename with flags implemented by fs? */
 563         unsigned no_rename2:1;
 564
 565         /** Use enhanced/automatic page cache invalidation. */
 566         unsigned auto_inval_data:1;
 567
 568         /** Does the filesystem support readdirplus? */
 569         unsigned do_readdirplus:1;
 570
 571         /** Does the filesystem want adaptive readdirplus? */
 572         unsigned readdirplus_auto:1;
 573
 574         /** Does the filesystem support asynchronous direct-IO submission? */
 575         unsigned async_dio:1;
 576
 577         /** The number of requests waiting for completion */
 578         atomic_t num_waiting;
 579
 580         /** Negotiated minor version */
 581         unsigned minor;
 582
 583         /** Backing dev info */
 584         struct backing_dev_info bdi;
 585
 586         /** Entry on the fuse_conn_list */
 587         struct list_head entry;
 588
 589         /** Device ID from super block */
 590         dev_t dev;
 591
 592         /** Dentries in the control filesystem */
 593         struct dentry *ctl_dentry[FUSE_CTL_NUM_DENTRIES];
 594
 595         /** number of dentries used in the above array */
 596         int ctl_ndents;
 597
 598         /** O_ASYNC requests */
 599         struct fasync_struct *fasync;
 600
 601         /** Key for lock owner ID scrambling */
 602         u32 scramble_key[4];
 603
 604         /** Reserved request for the DESTROY message */
 605         struct fuse_req *destroy_req;
 606
 607         /** Version counter for attribute changes */
 608         u64 attr_version;
 609
 610         /** Called on final put */
 611         void (*release)(struct fuse_conn *);
 612
 613         /** Super block for this connection. */
 614         struct super_block *sb;
 615
 616         /** Read/write semaphore to hold when accessing sb. */
 617         struct rw_semaphore killsb;
 618 };
 619
 620 static inline struct fuse_conn *get_fuse_conn_super(struct super_block *sb)
 621 {
 622         return sb->s_fs_info;
 623 }
 624
 625 static inline struct fuse_conn *get_fuse_conn(struct inode *inode)
 626 {
 627         return get_fuse_conn_super(inode->i_sb);
 628 }
 629
 630 static inline struct fuse_inode *get_fuse_inode(struct inode *inode)
 631 {
 632         return container_of(inode, struct fuse_inode, inode);
 633 }
 634
 635 static inline u64 get_node_id(struct inode *inode)
 636 {
 637         return get_fuse_inode(inode)->nodeid;
 638 }
 639
 640 /** Device operations */
 641 extern const struct file_operations fuse_dev_operations;
 642
 643 extern const struct dentry_operations fuse_dentry_operations;
 644
 645 /**
 646  * Inode to nodeid comparison.
 647  */
 648 int fuse_inode_eq(struct inode *inode, void *_nodeidp);
 649
 650 /**
 651  * Get a filled in inode
 652  */
 653 struct inode *fuse_iget(struct super_block *sb, u64 nodeid,
 654                         int generation, struct fuse_attr *attr,
 655                         u64 attr_valid, u64 attr_version);
 656
 657 int fuse_lookup_name(struct super_block *sb, u64 nodeid, struct qstr *name,
 658                      struct fuse_entry_out *outarg, struct inode **inode);
 659
 660 /**
 661  * Send FORGET command
 662  */
 663 void fuse_queue_forget(struct fuse_conn *fc, struct fuse_forget_link *forget,
 664                        u64 nodeid, u64 nlookup);
 665
 666 struct fuse_forget_link *fuse_alloc_forget(void);
 667
 668 /* Used by READDIRPLUS */
 669 void fuse_force_forget(struct file *file, u64 nodeid);
 670
 671 /**
 672  * Initialize READ or READDIR request
 673  */
 674 void fuse_read_fill(struct fuse_req *req, struct file *file,
 675                     loff_t pos, size_t count, int opcode);
 676
 677 /**
 678  * Send OPEN or OPENDIR request
 679  */
 680 int fuse_open_common(struct inode *inode, struct file *file, bool isdir);
 681
 682 struct fuse_file *fuse_file_alloc(struct fuse_conn *fc);
 683 struct fuse_file *fuse_file_get(struct fuse_file *ff);
 684 void fuse_file_free(struct fuse_file *ff);
 685 void fuse_finish_open(struct inode *inode, struct file *file);
 686
 687 void fuse_sync_release(struct fuse_file *ff, int flags);
 688
 689 /**
 690  * Send RELEASE or RELEASEDIR request
 691  */
 692 void fuse_release_common(struct file *file, int opcode);
 693
 694 /**
 695  * Send FSYNC or FSYNCDIR request
 696  */
 697 int fuse_fsync_common(struct file *file, loff_t start, loff_t end,
 698                       int datasync, int isdir);
 699
 700 /**
 701  * Notify poll wakeup
 702  */
 703 int fuse_notify_poll_wakeup(struct fuse_conn *fc,
 704                             struct fuse_notify_poll_wakeup_out *outarg);
 705
 706 /**
 707  * Initialize file operations on a regular file
 708  */
 709 void fuse_init_file_inode(struct inode *inode);
 710
 711 /**
 712  * Initialize inode operations on regular files and special files
 713  */
 714 void fuse_init_common(struct inode *inode);
 715
 716 /**
 717  * Initialize inode and file operations on a directory
 718  */
 719 void fuse_init_dir(struct inode *inode);
 720
 721 /**
 722  * Initialize inode operations on a symlink
 723  */
 724 void fuse_init_symlink(struct inode *inode);
 725
 726 /**
 727  * Change attributes of an inode
 728  */
 729 void fuse_change_attributes(struct inode *inode, struct fuse_attr *attr,
 730                             u64 attr_valid, u64 attr_version);
 731
 732 void fuse_change_attributes_common(struct inode *inode, struct fuse_attr *attr,
 733                                    u64 attr_valid);
 734
 735 /**
 736  * Initialize the client device
 737  */
 738 int fuse_dev_init(void);
 739
 740 /**
 741  * Cleanup the client device
 742  */
 743 void fuse_dev_cleanup(void);
 744
 745 int fuse_ctl_init(void);
 746 void __exit fuse_ctl_cleanup(void);
 747
 748 /**
 749  * Allocate a request
 750  */
 751 struct fuse_req *fuse_request_alloc(unsigned npages);
 752
 753 struct fuse_req *fuse_request_alloc_nofs(unsigned npages);
 754
 755 /**
 756  * Free a request
 757  */
 758 void fuse_request_free(struct fuse_req *req);
 759
 760 /**
 761  * Get a request, may fail with -ENOMEM,
 762  * caller should specify # elements in req->pages[] explicitly
 763  */
 764 struct fuse_req *fuse_get_req(struct fuse_conn *fc, unsigned npages);
 765 struct fuse_req *fuse_get_req_for_background(struct fuse_conn *fc,
 766                                              unsigned npages);
 767
 768 /*
 769  * Increment reference count on request
 770  */
 771 void __fuse_get_request(struct fuse_req *req);
 772
 773 /**
 774  * Gets a requests for a file operation, always succeeds
 775  */
 776 struct fuse_req *fuse_get_req_nofail_nopages(struct fuse_conn *fc,
 777                                              struct file *file);
 778
 779 /**
 780  * Decrement reference count of a request.  If count goes to zero free
 781  * the request.
 782  */
 783 void fuse_put_request(struct fuse_conn *fc, struct fuse_req *req);
 784
 785 /**
 786  * Send a request (synchronous)
 787  */
 788 void fuse_request_send(struct fuse_conn *fc, struct fuse_req *req);
 789
 790 /**
 791  * Simple request sending that does request allocation and freeing
 792  */
 793 ssize_t fuse_simple_request(struct fuse_conn *fc, struct fuse_args *args);
 794
 795 /**
 796  * Send a request in the background
 797  */
 798 void fuse_request_send_background(struct fuse_conn *fc, struct fuse_req *req);
 799
 800 void fuse_request_send_background_locked(struct fuse_conn *fc,
 801                                          struct fuse_req *req);
 802
 803 /* Abort all requests */
 804 void fuse_abort_conn(struct fuse_conn *fc);
 805
 806 /**
 807  * Invalidate inode attributes
 808  */
 809 void fuse_invalidate_attr(struct inode *inode);
 810
 811 void fuse_invalidate_entry_cache(struct dentry *entry);
 812
 813 void fuse_invalidate_atime(struct inode *inode);
 814
 815 /**
 816  * Acquire reference to fuse_conn
 817  */
 818 struct fuse_conn *fuse_conn_get(struct fuse_conn *fc);
 819
 820 /**
 821  * Initialize fuse_conn
 822  */
 823 void fuse_conn_init(struct fuse_conn *fc);
 824
 825 /**
 826  * Release reference to fuse_conn
 827  */
 828 void fuse_conn_put(struct fuse_conn *fc);
 829
 830 /**
 831  * Add connection to control filesystem
 832  */
 833 int fuse_ctl_add_conn(struct fuse_conn *fc);
 834
 835 /**
 836  * Remove connection from control filesystem
 837  */
 838 void fuse_ctl_remove_conn(struct fuse_conn *fc);
 839
 840 /**
 841  * Is file type valid?
 842  */
 843 int fuse_valid_type(int m);
 844
 845 /**
 846  * Is current process allowed to perform filesystem operation?
 847  */
 848 int fuse_allow_current_process(struct fuse_conn *fc);
 849
 850 u64 fuse_lock_owner_id(struct fuse_conn *fc, fl_owner_t id);
 851
 852 int fuse_update_attributes(struct inode *inode, struct kstat *stat,
 853                            struct file *file, bool *refreshed);
 854
 855 void fuse_flush_writepages(struct inode *inode);
 856
 857 void fuse_set_nowrite(struct inode *inode);
 858 void fuse_release_nowrite(struct inode *inode);
 859
 860 u64 fuse_get_attr_version(struct fuse_conn *fc);
 861
 862 /**
 863  * File-system tells the kernel to invalidate cache for the given node id.
 864  */
 865 int fuse_reverse_inval_inode(struct super_block *sb, u64 nodeid,
 866                              loff_t offset, loff_t len);
 867
 868 /**
 869  * File-system tells the kernel to invalidate parent attributes and
 870  * the dentry matching parent/name.
 871  *
 872  * If the child_nodeid is non-zero and:
 873  *    - matches the inode number for the dentry matching parent/name,
 874  *    - is not a mount point
 875  *    - is a file or oan empty directory
 876  * then the dentry is unhashed (d_delete()).
 877  */
 878 int fuse_reverse_inval_entry(struct super_block *sb, u64 parent_nodeid,
 879                              u64 child_nodeid, struct qstr *name);
 880
 881 int fuse_do_open(struct fuse_conn *fc, u64 nodeid, struct file *file,
 882                  bool isdir);
 883
 884 /**
 885  * fuse_direct_io() flags
 886  */
 887
 888 /** If set, it is WRITE; otherwise - READ */
 889 #define FUSE_DIO_WRITE (1 << 0)
 890
 891 /** CUSE pass fuse_direct_io() a file which f_mapping->host is not from FUSE */
 892 #define FUSE_DIO_CUSE  (1 << 1)
 893
 894 ssize_t fuse_direct_io(struct fuse_io_priv *io, struct iov_iter *iter,
 895                        loff_t *ppos, int flags);
 896 long fuse_do_ioctl(struct file *file, unsigned int cmd, unsigned long arg,
 897                    unsigned int flags);
 898 long fuse_ioctl_common(struct file *file, unsigned int cmd,
 899                        unsigned long arg, unsigned int flags);
 900 unsigned fuse_file_poll(struct file *file, poll_table *wait);
 901 int fuse_dev_release(struct inode *inode, struct file *file);
 902
 903 bool fuse_write_update_size(struct inode *inode, loff_t pos);
 904
 905 int fuse_flush_times(struct inode *inode, struct fuse_file *ff);
 906 int fuse_write_inode(struct inode *inode, struct writeback_control *wbc);
 907
 908 int fuse_do_setattr(struct inode *inode, struct iattr *attr,
 909                     struct file *file);
 910
 911 void fuse_set_initialized(struct fuse_conn *fc);
 912
 913 #endif /* _FS_FUSE_I_H */