FreeBSD/Linux Kernel Cross Reference
sys/kern/vfs_vfsops.c

     /*
      * Copyright (c) 2009 The DragonFly Project.  All rights reserved.
      *
      * This code is derived from software contributed to The DragonFly Project
      * by Matthew Dillon <dillon@backplane.com>
      *
      * 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.
     * 3. Neither the name of The DragonFly Project nor the names of its
     *    contributors may be used to endorse or promote products derived
     *    from this software without specific, prior written permission.
     *
     * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS 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
     * COPYRIGHT HOLDERS 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.
     */
    /*
     * Implement mp->mnt_ops function call wrappers.
     *
     * These wrappers are responsible for handling all MPSAFE issues related to
     * a mount.
     */
    
    #include <sys/param.h>
    #include <sys/systm.h>
    #include <sys/buf.h>
    #include <sys/conf.h>
    #include <sys/dirent.h>
    #include <sys/domain.h>
    #include <sys/eventhandler.h>
    #include <sys/fcntl.h>
    #include <sys/kernel.h>
    #include <sys/kthread.h>
    #include <sys/malloc.h>
    #include <sys/mbuf.h>
    #include <sys/mount.h>
    #include <sys/proc.h>
    #include <sys/namei.h>
    #include <sys/reboot.h>
    #include <sys/socket.h>
    #include <sys/stat.h>
    #include <sys/sysctl.h>
    #include <sys/syslog.h>
    #include <sys/vmmeter.h>
    #include <sys/vnode.h>
    #include <sys/vfsops.h>
    #include <sys/sysmsg.h>
    
    #include <machine/limits.h>
    
    #include <vm/vm.h>
    #include <vm/vm_object.h>
    #include <vm/vm_extern.h>
    #include <vm/vm_kern.h>
    #include <vm/pmap.h>
    #include <vm/vm_map.h>
    #include <vm/vm_page.h>
    #include <vm/vm_pager.h>
    #include <vm/vnode_pager.h>
    #include <vm/vm_zone.h>
    
    #include <sys/buf2.h>
    #include <sys/thread2.h>
    #include <sys/mplock2.h>
    
    /*
     * MPSAFE
     */
    int
    vfs_mount(struct mount *mp, char *path, caddr_t data, struct ucred *cred)
    {
            VFS_MPLOCK_DECLARE;
            int error;
    
            VFS_MPLOCK1(mp);
            error = (mp->mnt_op->vfs_mount)(mp, path, data, cred);
            VFS_MPUNLOCK(mp);
    
            return (error);
    }
    
    /*
    * MPSAFE
    */
   int
   vfs_start(struct mount *mp, int flags)
   {
           VFS_MPLOCK_DECLARE;
           int error;
   
           VFS_MPLOCK_FLAG(mp, MNTK_ST_MPSAFE);
           error = (mp->mnt_op->vfs_start)(mp, flags);
           if (error == 0) {
                   /* do not call vfs_acinit on mount updates */
                   if ((mp->mnt_flag & MNT_UPDATE) == 0)
                           VFS_ACINIT(mp,error);
           }
           VFS_MPUNLOCK(mp);
           if (error == EMOUNTEXIT)
                   error = 0;
           return (error);
   }
   
   /*
    * MPSAFE
    */
   int
   vfs_unmount(struct mount *mp, int mntflags)
   {
           VFS_MPLOCK_DECLARE;
           int error;
           int flags;
   
           VFS_MPLOCK1(mp);
           VFS_ACDONE(mp);
           flags = mp->mnt_kern_flag;
           error = (mp->mnt_op->vfs_unmount)(mp, mntflags);
           if (error == 0)
                   vn_syncer_thr_stop(mp);
           VFS_MPUNLOCK(mp);
           return (error);
   }
   
   /*
    * MPSAFE
    */
   int
   vfs_root(struct mount *mp, struct vnode **vpp)
   {
           VFS_MPLOCK_DECLARE;
           int error;
   
           VFS_MPLOCK1(mp);
           error = (mp->mnt_op->vfs_root)(mp, vpp);
           VFS_MPUNLOCK(mp);
           return (error);
   }
   
   /*
    * MPSAFE
    */
   int
   vfs_quotactl(struct mount *mp, int cmds, uid_t uid, caddr_t arg,
                struct ucred *cred)
   {
           VFS_MPLOCK_DECLARE;
           int error;
   
           VFS_MPLOCK1(mp);
           error = (mp->mnt_op->vfs_quotactl)(mp, cmds, uid, arg, cred);
           VFS_MPUNLOCK(mp);
           return (error);
   }
   
   /*
    * MPSAFE
    */
   int
   vfs_statfs(struct mount *mp, struct statfs *sbp, struct ucred *cred)
   {
           VFS_MPLOCK_DECLARE;
           int error;
   
           VFS_MPLOCK1(mp);
           error = (mp->mnt_op->vfs_statfs)(mp, sbp, cred);
           VFS_MPUNLOCK(mp);
           return (error);
   }
   
   int
   vfs_statvfs(struct mount *mp, struct statvfs *sbp, struct ucred *cred)
   {
           VFS_MPLOCK_DECLARE;
           int error;
   
           VFS_MPLOCK1(mp);
           error = (mp->mnt_op->vfs_statvfs)(mp, sbp, cred);
           VFS_MPUNLOCK(mp);
           return (error);
   }
   
   /*
    * MPSAFE
    */
   int
   vfs_sync(struct mount *mp, int waitfor)
   {
           VFS_MPLOCK_DECLARE;
           int error;
   
           VFS_MPLOCK1(mp);
           error = (mp->mnt_op->vfs_sync)(mp, waitfor);
           VFS_MPUNLOCK(mp);
           return (error);
   }
   
   /*
    * MPSAFE
    */
   int
   vfs_vget(struct mount *mp, struct vnode *dvp, ino_t ino, struct vnode **vpp)
   {
           VFS_MPLOCK_DECLARE;
           int error;
   
           VFS_MPLOCK1(mp);
           error = (mp->mnt_op->vfs_vget)(mp, dvp, ino, vpp);
           VFS_MPUNLOCK(mp);
           return (error);
   }
   
   /*
    * MPSAFE
    */
   int
   vfs_fhtovp(struct mount *mp, struct vnode *rootvp,
              struct fid *fhp, struct vnode **vpp)
   {
           VFS_MPLOCK_DECLARE;
           int error;
   
           VFS_MPLOCK1(mp);
           error = (mp->mnt_op->vfs_fhtovp)(mp, rootvp, fhp, vpp);
           VFS_MPUNLOCK(mp);
           return (error);
   }
   
   /*
    * MPSAFE
    */
   int
   vfs_checkexp(struct mount *mp, struct sockaddr *nam,
                int *extflagsp, struct ucred **credanonp)
   {
           VFS_MPLOCK_DECLARE;
           int error;
   
           VFS_MPLOCK1(mp);
           error = (mp->mnt_op->vfs_checkexp)(mp, nam, extflagsp, credanonp);
           VFS_MPUNLOCK(mp);
           return (error);
   }
   
   /*
    * MPSAFE
    */
   int
   vfs_vptofh(struct vnode *vp, struct fid *fhp)
   {
           VFS_MPLOCK_DECLARE;
           int error;
   
           VFS_MPLOCK1(vp->v_mount);
           error = (vp->v_mount->mnt_op->vfs_vptofh)(vp, fhp);
           VFS_MPUNLOCK(vp->v_mount);
           return (error);
   }
   
   /*
    * MPSAFE
    */
   int
   vfs_init(struct vfsconf *vfc)
   {
           int error;
   
           get_mplock();
           error = (vfc->vfc_vfsops->vfs_init)(vfc);
           rel_mplock();
   
           return (error);
   }
   
   /*
    * MPSAFE
    */
   int
   vfs_uninit(struct vfsconf *vfc, struct vfsconf *vfsp)
   {
           int error;
   
           get_mplock();
           error = (vfc->vfc_vfsops->vfs_uninit)(vfsp);
           rel_mplock();
   
           return (error);
   }
   
   /*
    * MPSAFE
    */
   int
   vfs_extattrctl(struct mount *mp, int cmd, struct vnode *vp,
                    int attrnamespace, const char *attrname,
                    struct ucred *cred)
   {
           VFS_MPLOCK_DECLARE;
           int error;
   
           VFS_MPLOCK1(mp);
           error = (mp->mnt_op->vfs_extattrctl)(mp, cmd, vp,
                                                attrnamespace, attrname,
                                                cred);
           VFS_MPUNLOCK(mp);
           return (error);
   }

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