Ejemplo n.º 1
0
int
fuse_filehandle_put(vnode_t vp, vfs_context_t context, fufh_type_t fufh_type,
                    fuse_op_waitfor_t waitfor)
{
    struct fuse_data       *data;
    struct fuse_dispatcher  fdi;
    struct fuse_abi_data    fri;
    struct fuse_vnode_data *fvdat = VTOFUD(vp);
    struct fuse_filehandle *fufh  = NULL;

    int err   = 0;
    int op    = FUSE_RELEASE;

    fuse_trace_printf("fuse_filehandle_put(vp=%p, fufh_type=%d)\n",
                      vp, fufh_type);

    fufh = &(fvdat->fufh[fufh_type]);

    if (FUFH_IS_VALID(fufh)) {
        panic("osxfuse: filehandle_put called on a valid fufh (type=%d)",
              fufh_type);
        /* NOTREACHED */
    }

    if (fuse_isdeadfs(vp)) {
        goto out;
    }

    data = fuse_get_mpdata(vnode_mount(vp));

    if (vnode_isdir(vp)) {
        op = FUSE_RELEASEDIR;
    }

    fdisp_init_abi(&fdi, fuse_release_in, data);
    fdisp_make_vp(&fdi, op, vp, context);
    fuse_abi_data_init(&fri, DATOI(data), fdi.indata);

    fuse_release_in_set_fh(&fri, fufh->fh_id);
    fuse_release_in_set_flags(&fri, fufh->open_flags);

    if (waitfor == FUSE_OP_FOREGROUNDED) {
        err = fdisp_wait_answ(&fdi);
        if (err) {
            goto out;
        }
    } else {
        fuse_insert_message(fdi.tick);
    }

    fuse_ticket_release(fdi.tick);

out:
    FUSE_OSAddAtomic(-1, (SInt32 *)&fuse_fh_current);
    fuse_invalidate_attr(vp);

    return err;
}
Ejemplo n.º 2
0
int
fuse_filehandle_put(vnode_t vp, vfs_context_t context, fufh_type_t fufh_type,
                    fuse_op_waitfor_t waitfor)
{
    struct fuse_dispatcher  fdi;
    struct fuse_release_in *fri;
    struct fuse_vnode_data *fvdat = VTOFUD(vp);
    struct fuse_filehandle *fufh  = NULL;

    int err   = 0;
    int isdir = 0;
    int op    = FUSE_RELEASE;

    fuse_trace_printf("fuse_filehandle_put(vp=%p, fufh_type=%d)\n",
                      vp, fufh_type);

    fufh = &(fvdat->fufh[fufh_type]);

    if (FUFH_IS_VALID(fufh)) {
        panic("MacFUSE: filehandle_put called on a valid fufh (type=%d)",
              fufh_type);
        /* NOTREACHED */
    }

    if (fuse_isdeadfs(vp)) {
        goto out;
    }

    if (vnode_isdir(vp)) {
        op = FUSE_RELEASEDIR;
        isdir = 1;
    }

    fdisp_init(&fdi, sizeof(*fri));
    fdisp_make_vp(&fdi, op, vp, context);
    fri = fdi.indata;
    fri->fh = fufh->fh_id;
    fri->flags = fufh->open_flags;

    if (waitfor == FUSE_OP_FOREGROUNDED) {
        if ((err = fdisp_wait_answ(&fdi))) {
            goto out;
        } else {
            fuse_ticket_drop(fdi.tick);
        }
    } else {
        fuse_insert_callback(fdi.tick, NULL);
        fuse_insert_message(fdi.tick);
    }

out:
    FUSE_OSAddAtomic(-1, (SInt32 *)&fuse_fh_current);
    fuse_invalidate_attr(vp);

    return err;
}
Ejemplo n.º 3
0
errno_t
FSNodeGetOrCreateFileVNodeByID(vnode_t              *vnPtr,
                               uint32_t              flags,
                               struct fuse_abi_data *feo,
                               mount_t               mp,
                               vnode_t               dvp,
                               vfs_context_t         context,
                               uint32_t             *oflags)
{
    int   err;

    vnode_t  vn    = NULLVP;
    HNodeRef hn    = NULL;

    struct fuse_vnode_data *fvdat   = NULL;
    struct fuse_data       *mntdata = NULL;
    fuse_device_t           dummy_device;

    struct fuse_abi_data fa;

    enum vtype vtyp;

    fuse_abi_data_init(&fa, feo->fad_version, fuse_entry_out_get_attr(feo));

    vtyp = IFTOVT(fuse_attr_get_mode(&fa));

    if ((vtyp >= VBAD) || (vtyp == VNON)) {
        return EINVAL;
    }

    int      markroot   = (flags & FN_IS_ROOT) ? 1 : 0;
    uint64_t size       = (flags & FN_IS_ROOT) ? 0 : fuse_attr_get_size(&fa);
    uint32_t rdev       = (flags & FN_IS_ROOT) ? 0 : fuse_attr_get_rdev(&fa);
    uint64_t generation = fuse_entry_out_get_generation(feo);

    mntdata = fuse_get_mpdata(mp);
    dummy_device = mntdata->fdev;

    err = HNodeLookupCreatingIfNecessary(dummy_device, fuse_entry_out_get_nodeid(feo),
                                         0 /* fork index */, &hn, &vn);
    if ((err == 0) && (vn == NULL)) {

        struct vnode_fsparam params;

        fvdat = (struct fuse_vnode_data *)FSNodeGenericFromHNode(hn);

        if (!fvdat->fInitialised) {

            fvdat->fInitialised = true;

            /* self */
            fvdat->vp           = NULLVP; /* hold on */
            fvdat->nodeid       = fuse_entry_out_get_nodeid(feo);
            fvdat->generation   = generation;

            /* parent */
            fvdat->parentvp     = dvp;
            if (dvp) {
                fvdat->parent_nodeid = VTOI(dvp);
            } else {
                fvdat->parent_nodeid = 0;
            }

            /* I/O */
            {
                int k;
                for (k = 0; k < FUFH_MAXTYPE; k++) {
                    FUFH_USE_RESET(&(fvdat->fufh[k]));
                }
            }

            /* flags */
            fvdat->flag         = flags;
            fvdat->c_flag       = 0;

            /* meta */

            /* XXX: truncation */
            fvdat->entry_valid.tv_sec  = (time_t)fuse_entry_out_get_entry_valid(feo);

            fvdat->entry_valid.tv_nsec = fuse_entry_out_get_entry_valid_nsec(feo);

            /* XXX: truncation */
            fvdat->attr_valid.tv_sec   = 0;

            fvdat->attr_valid.tv_nsec  = 0;

            /* XXX: truncation */
            fvdat->modify_time.tv_sec  = (time_t)fuse_attr_get_mtime(&fa);

            fvdat->modify_time.tv_nsec = fuse_attr_get_mtimensec(&fa);

            fvdat->filesize            = size;
            fvdat->nlookup             = 0;
            fvdat->vtype               = vtyp;

            /* locking */
            fvdat->createlock = lck_mtx_alloc_init(fuse_lock_group,
                                                   fuse_lock_attr);
            fvdat->creator = current_thread();
#if M_OSXFUSE_ENABLE_TSLOCKING
            fvdat->nodelock = lck_rw_alloc_init(fuse_lock_group,
                                                fuse_lock_attr);
            fvdat->nodelockowner = NULL;
            fvdat->truncatelock  = lck_rw_alloc_init(fuse_lock_group,
                                                     fuse_lock_attr);
#endif
        }

        if (err == 0) {
            params.vnfs_mp     = mp;
            params.vnfs_vtype  = vtyp;
            params.vnfs_str    = NULL;
            params.vnfs_dvp    = dvp; /* NULLVP for the root vnode */
            params.vnfs_fsnode = hn;

#if M_OSXFUSE_ENABLE_SPECFS
            if ((vtyp == VBLK) || (vtyp == VCHR)) {
                params.vnfs_vops = fuse_spec_operations;
                params.vnfs_rdev = (dev_t)rdev;
#else
            if (0) {
#endif
#if M_OSXFUSE_ENABLE_FIFOFS
            } else if (vtyp == VFIFO) {
                params.vnfs_vops = fuse_fifo_operations;
                params.vnfs_rdev = 0;
                (void)rdev;
#else
            } else if (0) {
#endif
            } else {
                params.vnfs_vops = fuse_vnode_operations;
                params.vnfs_rdev = 0;
                (void)rdev;
            }

            params.vnfs_marksystem = 0;
            params.vnfs_cnp        = NULL;
            params.vnfs_flags      = VNFS_NOCACHE | VNFS_CANTCACHE;
            params.vnfs_filesize   = size;
            params.vnfs_markroot   = markroot;

#if M_OSXFUSE_ENABLE_BIG_LOCK
            fuse_biglock_unlock(mntdata->biglock);
#endif
            err = vnode_create(VNCREATE_FLAVOR, (uint32_t)sizeof(params),
                               &params, &vn);
#if M_OSXFUSE_ENABLE_BIG_LOCK
            fuse_biglock_lock(mntdata->biglock);
#endif
        }

        if (err == 0) {
            if (markroot) {
                fvdat->parentvp = vn;
            } else {
                fvdat->parentvp = dvp;
            }
            if (oflags) {
                *oflags |= MAKEENTRY;
            }

            /* Need VT_OSXFUSE from xnu */
            vnode_settag(vn, VT_OTHER);

            cache_attrs(vn, fuse_entry_out, feo);

            HNodeAttachVNodeSucceeded(hn, 0 /* forkIndex */, vn);
            FUSE_OSAddAtomic(1, (SInt32 *)&fuse_vnodes_current);
        } else {
            if (HNodeAttachVNodeFailed(hn, 0 /* forkIndex */)) {
                FSNodeScrub(fvdat);
                HNodeScrubDone(hn);
            }
        }
    }

    if (err == 0) {
        if (vnode_vtype(vn) != vtyp) {
            IOLog("osxfuse: vnode changed type behind us (old=%d, new=%d)\n",
                  vnode_vtype(vn), vtyp);
#if M_OSXFUSE_ENABLE_BIG_LOCK
            fuse_biglock_unlock(mntdata->biglock);
#endif
            fuse_internal_vnode_disappear(vn, context, REVOKE_SOFT);
            vnode_put(vn);
#if M_OSXFUSE_ENABLE_BIG_LOCK
            fuse_biglock_lock(mntdata->biglock);
#endif
            err = EIO;
        } else if (VTOFUD(vn)->generation != generation) {
            IOLog("osxfuse: vnode changed generation\n");
#if M_OSXFUSE_ENABLE_BIG_LOCK
            fuse_biglock_unlock(mntdata->biglock);
#endif
            fuse_internal_vnode_disappear(vn, context, REVOKE_SOFT);
            vnode_put(vn);
#if M_OSXFUSE_ENABLE_BIG_LOCK
            fuse_biglock_lock(mntdata->biglock);
#endif
            err = ESTALE;
        }
    }

    if (err == 0) {
        *vnPtr = vn;
    }

    /* assert((err == 0) == (*vnPtr != NULL); */

    return err;
}

int
fuse_vget_i(vnode_t              *vpp,
            uint32_t              flags,
            struct fuse_abi_data *feo,
            struct componentname *cnp,
            vnode_t               dvp,
            mount_t               mp,
            vfs_context_t         context)
{
    int err = 0;

    if (!feo) {
        return EINVAL;
    }

    err = FSNodeGetOrCreateFileVNodeByID(vpp, flags, feo, mp, dvp,
                                         context, NULL);
    if (err) {
        return err;
    }

    if (!fuse_isnovncache_mp(mp) && (cnp->cn_flags & MAKEENTRY)) {
        fuse_vncache_enter(dvp, *vpp, cnp);
    }

/* found: */

    VTOFUD(*vpp)->nlookup++;

    return 0;
}
Ejemplo n.º 4
0
/*
 * Because of the vagaries of how a filehandle can be used, we try not to
 * be too smart in here (we try to be smart elsewhere). It is required that
 * you come in here only if you really do not have the said filehandle--else
 * we panic.
 */
int
fuse_filehandle_get(vnode_t       vp,
                    vfs_context_t context,
                    fufh_type_t   fufh_type,
                    int           mode)
{
    struct fuse_dispatcher  fdi;
    struct fuse_abi_data    foi;
    struct fuse_abi_data    foo;
    struct fuse_filehandle *fufh;
    struct fuse_vnode_data *fvdat = VTOFUD(vp);

    struct fuse_data        *data = fuse_get_mpdata(vnode_mount(vp));

    int err    = 0;
    int oflags = 0;
    int op     = FUSE_OPEN;

    fuse_trace_printf("fuse_filehandle_get(vp=%p, fufh_type=%d, mode=%x)\n",
                      vp, fufh_type, mode);

    fufh = &(fvdat->fufh[fufh_type]);

    if (FUFH_IS_VALID(fufh)) {
        panic("osxfuse: filehandle_get called despite valid fufh (type=%d)",
              fufh_type);
        /* NOTREACHED */
    }

    /*
     * Note that this means we are effectively FILTERING OUT open() flags.
     */
    (void)mode;
    oflags = fuse_filehandle_xlate_to_oflags(fufh_type);

    if (vnode_isdir(vp)) {
        op = FUSE_OPENDIR;
        if (fufh_type != FUFH_RDONLY) {
            IOLog("osxfuse: non-rdonly fufh requested for directory\n");
            fufh_type = FUFH_RDONLY;
        }
    }

    if (vnode_islnk(vp) && (mode & O_SYMLINK)) {
        oflags |= O_SYMLINK;
    }

    if ((mode & O_TRUNC) && (data->dataflags & FSESS_ATOMIC_O_TRUNC)) {
        oflags |= O_TRUNC;
    }

    fdisp_init_abi(&fdi, fuse_open_in, data);
    fdisp_make_vp(&fdi, op, vp, context);
    fuse_abi_data_init(&foi, DATOI(data), fdi.indata);

    fuse_open_in_set_flags(&foi, oflags);

    FUSE_OSAddAtomic(1, (SInt32 *)&fuse_fh_upcall_count);
    err = fdisp_wait_answ(&fdi);
    if (err) {
#if M_OSXFUSE_ENABLE_UNSUPPORTED
        const char *vname = vnode_getname(vp);
#endif /* M_OSXFUSE_ENABLE_UNSUPPORTED */
        if (err == ENOENT) {
            /*
             * See comment in fuse_vnop_reclaim().
             */
            cache_purge(vp);
        }
#if M_OSXFUSE_ENABLE_UNSUPPORTED
        IOLog("osxfuse: filehandle_get: failed for %s "
              "(type=%d, err=%d, caller=%p)\n",
              (vname) ? vname : "?", fufh_type, err,
               __builtin_return_address(0));
        if (vname) {
            vnode_putname(vname);
        }
#endif /* M_OSXFUSE_ENABLE_UNSUPPORTED */
        if (err == ENOENT) {
#if M_OSXFUSE_ENABLE_BIG_LOCK
            fuse_biglock_unlock(data->biglock);
#endif
            fuse_internal_vnode_disappear(vp, context, REVOKE_SOFT);
#if M_OSXFUSE_ENABLE_BIG_LOCK
            fuse_biglock_lock(data->biglock);
#endif
        }
        return err;
    }
    FUSE_OSAddAtomic(1, (SInt32 *)&fuse_fh_current);

    fuse_abi_data_init(&foo, DATOI(data), fdi.answ);

    fufh->fh_id = fuse_open_out_get_fh(&foo);
    fufh->open_count = 1;
    fufh->open_flags = oflags;
    fufh->fuse_open_flags = fuse_open_out_get_open_flags(&foo);
    fufh->aux_count = 0;

    fuse_ticket_release(fdi.tick);

    return 0;
}
Ejemplo n.º 5
0
__private_extern__
int
fuse_internal_strategy(vnode_t vp, buf_t bp)
{
    size_t biosize;
    size_t chunksize;
    size_t respsize;

    int mapped = FALSE;
    int mode;
    int op;
    int vtype = vnode_vtype(vp);

    int err = 0;

    caddr_t bufdat;
    off_t   left;
    off_t   offset;
    int32_t bflags = buf_flags(bp);

    fufh_type_t             fufh_type;
    struct fuse_dispatcher  fdi;
    struct fuse_data       *data;
    struct fuse_vnode_data *fvdat = VTOFUD(vp);
    struct fuse_filehandle *fufh = NULL;
    mount_t mp = vnode_mount(vp);

    data = fuse_get_mpdata(mp);

    biosize = data->blocksize;

    if (!(vtype == VREG || vtype == VDIR)) {
        return ENOTSUP;
    }
 
    if (bflags & B_READ) {
        mode = FREAD;
        fufh_type = FUFH_RDONLY; /* FUFH_RDWR will also do */
    } else {
        mode = FWRITE;
        fufh_type = FUFH_WRONLY; /* FUFH_RDWR will also do */
    }

    if (fvdat->flag & FN_CREATING) {
        fuse_lck_mtx_lock(fvdat->createlock);
        if (fvdat->flag & FN_CREATING) {
            (void)fuse_msleep(fvdat->creator, fvdat->createlock,
                              PDROP | PINOD | PCATCH, "fuse_internal_strategy",
                              NULL);
        } else {
            fuse_lck_mtx_unlock(fvdat->createlock);
        }
    }

    fufh = &(fvdat->fufh[fufh_type]);

    if (!FUFH_IS_VALID(fufh)) {
        fufh_type = FUFH_RDWR;
        fufh = &(fvdat->fufh[fufh_type]);
        if (!FUFH_IS_VALID(fufh)) {
            fufh = NULL;
        } else {
            /* We've successfully fallen back to FUFH_RDWR. */
        }
    }

    if (!fufh) {

        if (mode == FREAD) {
            fufh_type = FUFH_RDONLY;
        } else {
            fufh_type = FUFH_RDWR;
        }

        /*
         * Lets NOT do the filehandle preflight check here.
         */

        err = fuse_filehandle_get(vp, NULL, fufh_type, 0 /* mode */);

        if (!err) {
            fufh = &(fvdat->fufh[fufh_type]);
            FUFH_AUX_INC(fufh);
            /* We've created a NEW fufh of type fufh_type. open_count is 1. */
        }

    } else { /* good fufh */

        FUSE_OSAddAtomic(1, (SInt32 *)&fuse_fh_reuse_count);

        /* We're using an existing fufh of type fufh_type. */
    }

    if (err) {

         /* A more typical error case. */
         if ((err == ENOTCONN) || fuse_isdeadfs(vp)) {
             buf_seterror(bp, EIO);
             buf_biodone(bp);
             return EIO;
         }

         IOLog("MacFUSE: strategy failed to get fh "
               "(vtype=%d, fufh_type=%d, err=%d)\n", vtype, fufh_type, err);

         if (!vfs_issynchronous(mp)) {
             IOLog("MacFUSE: asynchronous write failed!\n");
         }

         buf_seterror(bp, EIO);
         buf_biodone(bp);
         return EIO;
    }

    if (!fufh) {
        panic("MacFUSE: tried everything but still no fufh");
        /* NOTREACHED */
    }

#define B_INVAL 0x00040000 /* Does not contain valid info. */
#define B_ERROR 0x00080000 /* I/O error occurred. */

    if (bflags & B_INVAL) {
        IOLog("MacFUSE: buffer does not contain valid information\n");
    } 

    if (bflags & B_ERROR) {
        IOLog("MacFUSE: an I/O error has occured\n");
    }

    if (buf_count(bp) == 0) {
        return 0;
    }

    fdisp_init(&fdi, 0);

    if (mode == FREAD) {

        struct fuse_read_in *fri;

        buf_setresid(bp, buf_count(bp));
        offset = (off_t)((off_t)buf_blkno(bp) * biosize);

        if (offset >= fvdat->filesize) {
            /* Trying to read at/after EOF? */           
            if (offset != fvdat->filesize) {
                /* Trying to read after EOF? */
                buf_seterror(bp, EINVAL);
            }
            buf_biodone(bp);
            return 0;
        }

        /* Note that we just made sure that offset < fvdat->filesize. */
        if ((offset + buf_count(bp)) > fvdat->filesize) {
            /* Trimming read */
            buf_setcount(bp, (uint32_t)(fvdat->filesize - offset));
        }

        if (buf_map(bp, &bufdat)) {
            IOLog("MacFUSE: failed to map buffer in strategy\n");
            return EFAULT;
        } else {
            mapped = TRUE;
        }

        while (buf_resid(bp) > 0) {

            chunksize = min((size_t)buf_resid(bp), data->iosize);

            fdi.iosize = sizeof(*fri);

            op = FUSE_READ;
            if (vtype == VDIR) {
                op = FUSE_READDIR;
            }
            fdisp_make_vp(&fdi, op, vp, (vfs_context_t)0);
        
            fri = fdi.indata;
            fri->fh = fufh->fh_id;

            /*
             * Historical note:
             *
             * fri->offset = ((off_t)(buf_blkno(bp))) * biosize;
             *
             * This wasn't being incremented!?
             */

            fri->offset = offset;
            fri->size = (typeof(fri->size))chunksize;
            fdi.tick->tk_aw_type = FT_A_BUF;
            fdi.tick->tk_aw_bufdata = bufdat;
        
            if ((err = fdisp_wait_answ(&fdi))) {
                /* There was a problem with reading. */
                goto out;
            }

            respsize = fdi.tick->tk_aw_bufsize;

            if (respsize < 0) { /* Cannot really happen... */
                err = EIO;
                goto out;
            }

            buf_setresid(bp, (uint32_t)(buf_resid(bp) - respsize));
            bufdat += respsize;
            offset += respsize;

            /* Did we hit EOF before being done? */
            if ((respsize == 0) && (buf_resid(bp) > 0)) {
                 /*
                  * Historical note:
                  * If we don't get enough data, just fill the rest with zeros.
                  * In NFS context, this would mean a hole in the file.
                  */

                 /* Zero-pad the incomplete buffer. */
                 bzero(bufdat, buf_resid(bp));
                 buf_setresid(bp, 0);
                 break;
            }
        } /* while (buf_resid(bp) > 0) */
    } else {
        /* write */
        struct fuse_write_in  *fwi;
        struct fuse_write_out *fwo;
        int merr = 0;
        off_t diff;

        if (buf_map(bp, &bufdat)) {
            IOLog("MacFUSE: failed to map buffer in strategy\n");
            return EFAULT;
        } else {
            mapped = TRUE;
        }

        /* Write begin */

        buf_setresid(bp, buf_count(bp));
        offset = (off_t)((off_t)buf_blkno(bp) * biosize);

        /* XXX: TBD -- Check here for extension (writing past end) */

        left = buf_count(bp);

        while (left) {

            fdi.iosize = sizeof(*fwi);
            op = FUSE_WRITE;

            fdisp_make_vp(&fdi, op, vp, (vfs_context_t)0);
            chunksize = min((size_t)left, data->iosize);

            fwi = fdi.indata;
            fwi->fh = fufh->fh_id;
            fwi->offset = offset;
            fwi->size = (typeof(fwi->size))chunksize;

            fdi.tick->tk_ms_type = FT_M_BUF;
            fdi.tick->tk_ms_bufdata = bufdat;
            fdi.tick->tk_ms_bufsize = chunksize;

            /* About to write <chunksize> at <offset> */

            if ((err = fdisp_wait_answ(&fdi))) {
                merr = 1;
                break;
            }
    
            fwo = fdi.answ;
            diff = chunksize - fwo->size;
            if (diff < 0) {
                err = EINVAL;
                break;
            }
    
            left -= fwo->size;
            bufdat += fwo->size;
            offset += fwo->size;
            buf_setresid(bp, buf_resid(bp) - fwo->size);
        }

        if (merr) {
            goto out;
        }
    }

    if (fdi.tick) {
        fuse_ticket_drop(fdi.tick);
    } else {
        /* No ticket upon leaving */
    }

out:

    if (err) {
        buf_seterror(bp, err);
    }

    if (mapped == TRUE) {
        buf_unmap(bp);
    }

    buf_biodone(bp);

    return err;
}    
Ejemplo n.º 6
0
/*
 * Because of the vagaries of how a filehandle can be used, we try not to
 * be too smart in here (we try to be smart elsewhere). It is required that
 * you come in here only if you really do not have the said filehandle--else
 * we panic.
 */
int
fuse_filehandle_get(vnode_t       vp,
                    vfs_context_t context,
                    fufh_type_t   fufh_type,
                    int           mode)
{
    struct fuse_dispatcher  fdi;
    struct fuse_open_in    *foi;
    struct fuse_open_out   *foo;
    struct fuse_filehandle *fufh;
    struct fuse_vnode_data *fvdat = VTOFUD(vp);

    int err    = 0;
    int isdir  = 0;
    int oflags = 0;
    int op     = FUSE_OPEN;

    fuse_trace_printf("fuse_filehandle_get(vp=%p, fufh_type=%d, mode=%x)\n",
                      vp, fufh_type, mode);

    fufh = &(fvdat->fufh[fufh_type]);

    if (FUFH_IS_VALID(fufh)) {
        panic("MacFUSE: filehandle_get called despite valid fufh (type=%d)",
              fufh_type);
        /* NOTREACHED */
    }

    /*
     * Note that this means we are effectively FILTERING OUT open() flags.
     */
    (void)mode;
    oflags = fuse_filehandle_xlate_to_oflags(fufh_type);

    if (vnode_isdir(vp)) {
        isdir = 1;
        op = FUSE_OPENDIR;
        if (fufh_type != FUFH_RDONLY) {
            IOLog("MacFUSE: non-rdonly fufh requested for directory\n");
            fufh_type = FUFH_RDONLY;
        }
    }

    fdisp_init(&fdi, sizeof(*foi));
    fdisp_make_vp(&fdi, op, vp, context);

    if (vnode_islnk(vp) && (mode & O_SYMLINK)) {
        oflags |= O_SYMLINK;
    }

    foi = fdi.indata;
    foi->flags = oflags;

    FUSE_OSAddAtomic(1, (SInt32 *)&fuse_fh_upcall_count);
    if ((err = fdisp_wait_answ(&fdi))) {
#if M_MACFUSE_ENABLE_UNSUPPORTED
        const char *vname = vnode_getname(vp);
#endif /* M_MACFUSE_ENABLE_UNSUPPORTED */
        if (err == ENOENT) {
            /*
             * See comment in fuse_vnop_reclaim().
             */
            cache_purge(vp);
        }
#if M_MACFUSE_ENABLE_UNSUPPORTED
        IOLog("MacFUSE: filehandle_get: failed for %s "
              "(type=%d, err=%d, caller=%p)\n",
              (vname) ? vname : "?", fufh_type, err,
               __builtin_return_address(0));
        if (vname) {
            vnode_putname(vname);
        }
#endif /* M_MACFUSE_ENABLE_UNSUPPORTED */
        if (err == ENOENT) {
            fuse_internal_vnode_disappear(vp, context, REVOKE_SOFT);
        }
        return err;
    }
    FUSE_OSAddAtomic(1, (SInt32 *)&fuse_fh_current);

    foo = fdi.answ;

    fufh->fh_id = foo->fh;
    fufh->open_count = 1;
    fufh->open_flags = oflags;
    fufh->fuse_open_flags = foo->open_flags;
    fufh->aux_count = 0;
    
    fuse_ticket_drop(fdi.tick);

    return 0;
}