FreeBSD/Linux Kernel Cross Reference
sys/fs/nandfs/nandfs_buffer.c

     /*-
      * Copyright (c) 2010-2012 Semihalf.
      * All rights reserved.
      *
      * Redistribution and use in source and binary forms, with or without
      * modification, are permitted provided that the following conditions
      * are met:
      * 1. Redistributions of source code must retain the above copyright
      *    notice, this list of conditions and the following disclaimer.
     * 2. Redistributions in binary form must reproduce the above copyright
     *    notice, this list of conditions and the following disclaimer in the
     *    documentation and/or other materials provided with the distribution.
     *
     * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
     * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
     * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     * SUCH DAMAGE.
     */
    
    #include <sys/cdefs.h>
    __FBSDID("$FreeBSD: releng/10.4/sys/fs/nandfs/nandfs_buffer.c 235537 2012-05-17 10:11:18Z gber $");
    
    #include <sys/param.h>
    #include <sys/systm.h>
    #include <sys/conf.h>
    #include <sys/kernel.h>
    #include <sys/lock.h>
    #include <sys/malloc.h>
    #include <sys/mount.h>
    #include <sys/mutex.h>
    #include <sys/buf.h>
    #include <sys/namei.h>
    #include <sys/vnode.h>
    #include <sys/bio.h>
    
    #include <fs/nandfs/nandfs_mount.h>
    #include <fs/nandfs/nandfs.h>
    #include <fs/nandfs/nandfs_subr.h>
    
    struct buf *
    nandfs_geteblk(int size, int flags)
    {
            struct buf *bp;
    
            /*
             * XXX
             * Right now we can call geteblk with GB_NOWAIT_BD flag, which means
             * it can return NULL. But we cannot afford to get NULL, hence this panic.
             */
            bp = geteblk(size, flags);
            if (bp == NULL)
                    panic("geteblk returned NULL");
    
            return (bp);
    }
    
    void
    nandfs_dirty_bufs_increment(struct nandfs_device *fsdev)
    {
    
            mtx_lock(&fsdev->nd_mutex);
            KASSERT(fsdev->nd_dirty_bufs >= 0, ("negative nd_dirty_bufs"));
            fsdev->nd_dirty_bufs++;
            mtx_unlock(&fsdev->nd_mutex);
    }
    
    void
    nandfs_dirty_bufs_decrement(struct nandfs_device *fsdev)
    {
    
            mtx_lock(&fsdev->nd_mutex);
            KASSERT(fsdev->nd_dirty_bufs > 0,
                ("decrementing not-positive nd_dirty_bufs"));
            fsdev->nd_dirty_bufs--;
            mtx_unlock(&fsdev->nd_mutex);
    }

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