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NAME

     VFS_SYNC - flush unwritten data

SYNOPSIS

     #include <sys/param.h>
     #include <sys/mount.h>
     #include <sys/vnode.h>

     int
     VFS_SYNC(struct mount *mp, int waitfor, struct thread *td);

DESCRIPTION

     The VFS_SYNC() macro writes out all unwritten data in the file system
     mounted as mp.

     The arguments it expects are:

     mp       The file system.

     waitfor  Whether the function should wait for I/O to complete.  Possible
              values are:

              MNT_WAIT    synchronously wait for I/O to complete

              MNT_NOWAIT  start all I/O, but do not wait for it

              MNT_LAZY    push data not written by file system syncer

     td       The calling thread.

     The VFS_SYNC() macro calls the vfs_sync method of the file system, which
     normally calls VOP_FSYNC(9) for all the vnodes in the file system.

SEE ALSO

     fsync(2), sync(2), VFS(9), vnode(9), VOP_FSYNC(9)

AUTHORS

     This manual page was written by Doug Rabson.