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vfs_busy (9)
  • >> vfs_busy (9) ( FreeBSD man: Ядро )

  • BSD mandoc
     

    NAME

    
    
    vfs_busy
    
     - marks a mount point as busy
    
     
    

    SYNOPSIS

       #include <sys/param.h>
       #include <sys/mount.h>
    int vfs_busy (struct mount *mp int flags struct mtx *interlkp struct thread *td);
     

    DESCRIPTION

    The vfs_busy ();
    function marks a mount point as busy. The purpose of this function is to synchronize access to a mount point. It also delays unmounting by sleeping on Fa mp if the MNTK_UNMOUNT flag is set in Fa mp->mnt_kern_flag and the LK_NOWAIT flag is not set.

    Its arguments are:

    Fa mp
    The mount point to busy.
    Fa flags
    Flags controlling how vfs_busy ();
    should act.

    LK_NOWAIT
    do not sleep if MNTK_UNMOUNT is set.

    Fa interlkp
    The interlock mutex for Fa mp->mount_lock . If there is any chance the mount point is being unmounted and LK_NOWAIT is not set then interlock must be valid locked mutex.
    Fa td
    The thread responsible for this call.

     

    LOCKS

    If Fa interlkp is a valid pointer it must be locked on entry, and it will not be unlocked even in the case of an error.  

    RETURN VALUES

    A 0 value is returned on success. If the mount point is being unmounted Er ENOENT will always be returned.  

    ERRORS

    Bq Er ENOENT
    The mount point is being unmounted ( MNTK_UNMOUNT is set).

     

    AUTHORS

    This manual page was written by An Chad David Aq [email protected] .


     

    Index

    NAME
    SYNOPSIS
    DESCRIPTION
    LOCKS
    RETURN VALUES
    ERRORS
    AUTHORS


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